CN101313091A - Crimped yarn, method for manufacture thereof, and fiber structure - Google Patents

Abstract

The invention relates to a crimped yarn and a fiber structure. The crimped yarn is characterized in that: a multifilament yarn composed of a synthetic fiber is crimped to obtain the crimped yarn; the synthetic fiber is composed of an aliphatic polyester resin (A) and a thermoplastic polyamide resin (B); the ratio of the exposed surface area of the aliphatic polyester resin (A) to the surface area of the fiber is below 5%. The fiber structure is characterized in that at least part of the fiber structure comprises the crimped yarn. The invention also relates to the crimped yarn and the fiber structure. The crimped yarn is composed of a polymer alloy synthetic fiber or core-sheath-type composite fiber. The polymer alloy synthetic fiber is composed of the aliphatic polyester resin (A) and the thermoplastic polyamide resin (B). The core component of the core-sheath-type composite fiber is composed of the aliphatic polyester resin (A) or a polymer alloy composed of the aliphatic polyester resin (A) and the thermoplastic polyamide resin (B). The sheath component is composed of the thermoplastic polyamide resin (B). The fiber structure is characterized in that at least part of the fiber structure comprises the crimped yarn.

Description

Crimped yarn and manufacture method thereof, fiber construct

Technical field

The present invention relates to the crimped yarn (crimped yarn) that is made of synthetic fiber, described synthetic fiber are made up of aliphatic polyester resin and thermoplastic polyamide resin, aliphatic polyester resin to expose area minimum with respect to the ratio of fiber surface area.

Background technology

Recently, along with the raising of the environmental protection consciousness of global scale, the fibrous raw material that an urgent demand exploitation can be decomposed in natural environment.For example, existing general-purpose plastics is main material with petroleum resources, is used as serious problem and proposes so petroleum resources face global warming that a large amount of consumption of exhaustion and petroleum resources cause.

Therefore, the research and development of various plastics such as aliphatic polyester or fiber have actively been carried out in recent years.Wherein, having used the plastics that can be degraded by microorganisms is that the fiber of biodegradable plastic receives publicity.

By being able to the growing plants resource as raw material with picked-up carbon dioxide from atmosphere, can expect to suppress global warming by the circulation of carbon dioxide, might solve the problem of resource exhaustion simultaneously.So, be that the plastics of initiation material promptly utilize biological plastics to begin to receive publicity with the plant resources.

So far, utilize biological biodegradable plastic to have mechanical characteristic and heat resistance is low, manufacturing cost is high problem, can't be used as general-purpose plastics.And biodegradable plastic higher as mechanical characteristic and heat resistance in recent years, low cost of manufacture is that the PLA of raw material receives publicity with the lactic acid that utilizes amylofermentation to obtain.

The aliphatic polyester resin that with the PLA is representative is used to medical field very early as for example surgical suture, but recently because the raising of the techniques of mass production, make its in price also can with other general-purpose plastics competitions.Therefore, the commodity development as fiber also enlivens gradually.

The exploitation of aliphatic poly ester fibers such as PLA is at first carried out in the Agricultural Materials of effectively utilizing biological degradability or engineering materials etc., next expectation be applied to as extensive purposes indoor purposes (interior use) such as dress material purposes, curtain, carpet, vehicle-mounted in dress purposes, industry material applications.But when being used for dress material purposes or industry material applications, particularly the ABRASION RESISTANCE of PLA is low becomes serious problem for aliphatic polyester.For example, when acid fiber by polylactic was used for the dress material purposes, because of wearing and tearing etc. move easily look, perhaps under serious situation, fiber generation fibrillation and turning white perhaps produced overstimulation etc. to skin, shortage durability during actual the use.Be used for automobile inside and use especially under the situation that is subjected to high-wearing carpet etc., hair takes place in PLA easily, cause simultaneously to come off, and under the serious situation, broken hole sometimes.In addition, aliphatic polyester (particularly PLA) is easily hydrolysis sometimes, passing in time, and above-mentioned fibrillation or come off the tendency that becomes serious is arranged, life of product is short.

As the method for the ABRASION RESISTANCE of improving PLA, the method that suppresses hydrolysis is for example arranged, comprising by suppressing the moisture rate of PLA as much as possible, and suppress the method for fiber hydrolysis in manufacturing process; Add the method for single carbodiimide (monocarbodiimide) compound raising hydrolytic resistance.Any one method suppress PLA through the time embrittlement aspect, can both suppress the decline of ABRASION RESISTANCE, but all can not change the characteristic of " fibrillation easily " of PLA, compare as can be known with existing product, initial wear-resisting performance is without any variation.

In addition, as the method for improving ABRASION RESISTANCE significantly, comprise by adding the coefficient of friction that aliphatic acid diamides lubricants such as (aliphatic acid bisamide) reduces fiber surface, the method that suppresses to wear and tear.But above-mentioned fiber was effectively at stressed hour, but under the situation that is subjected to strong pedal force of for example carpet and so on, can not fully suppress the adhesion between the fiber, so cause the damage of PLA, purposes is restricted.

In addition, the technology (patent documentation 1) that improves the mechanical characteristic of resin combination by mixed polyamide and aliphatic polyester is disclosed.Method according to record in the patent documentation 1, can utilize the consolidation effect of polyamide to improve mechanical characteristic such as intensity and heat resistance, ABRASION RESISTANCE, but in the method, polyamide is a minor constituent, and its mixing ratio (Blend ratio) is 5～40%, so aliphatic polyester forms sea component, in addition, because aliphatic polyester and polyamide are immiscible, the cementability of two-phase interface is poor, so exist the interface to peel off, take place the problem that fibrillation is turned white, the rate of wear is also accelerated because of external force easily.

In addition, also disclose, suppressed the orientation of polyamide fiber, made the technology (patent documentation 2) of its high ductilityization by the polyester differential is dispersed in the polyamide.By making this polyblend fibre (polymer alloy fiber), if mixing, knits the polyamide undrawn yarn that adds man-hour and flatness degree in false twisting, can give then that crimped yarn is high to expand.But, though this polyblend fibre is suitable for the sheath silk that false twisting adds man-hour, but when being used to make air flow jetting method filling (air stuffer) crimped yarn as the object of the invention, on the contrary because fiber orientation is insufficient, thermal contraction in air flow jetting method stuffer box crimping device is insufficient, three-dimensional crimp can not be carried out, and the low crimped yarn of crimp extension rate (crimp elongation) can only be obtained.

The composite fibre (patent documentation 3) that has improved ABRASION RESISTANCE by the high polyamide of configuration ABRASION RESISTANCE in the sheath composition is also disclosed.Can suppress coming off of fiber significantly according to this technology.But when making composite fibre, in senior manufacturing procedure or when using product, external force concentrates on the weak core composition of cementability and the interface (hereinafter referred to as core sheath interface) of sheath composition, and core sheath interface peel takes place, and causes the new problem of appearance change (turning white).In a single day peel off at core sheath interface, then interface peel transmits on the length direction of fiber, causes fragmentary visible white stripes shape defective.Particularly when being used to pay attention to the purposes of outward appearance, above-mentioned situation becomes defective.In addition, if peel off at core sheath interface, then exist because the wearing and tearing of core composition and sheath composition cause the sheath composition to break (splitting hereinafter referred to as sheath), further the problem that develops to fibrillation.

The composite fibre that becomes to assign to improve ABRASION RESISTANCE by the polyamide thermoplastic with specific thicknesses as sheath is disclosed in the patent documentation 3.This composite fibre is brought into play effect in dress material purposes etc. only is subjected to the purposes of low wearing and tearing.But, being subjected in the purposes of strong external force in interruptions such as carpets, peel off easily at the interface, thereby easily cause appearance change.In addition, though disclose the crimped yarn (false twist yarn) that uses this composite fibre to form in the patent documentation 3, the crimped yarn that is made of composite fibre is compared with crimped yarn not, and peel off easily at core sheath interface.And, this anti-fissility exist along with aliphatic polyester through the time change and the tendency that worsens, anti-fissility is insufficient, the labile defective of product appearance though the configuration polyamide as the composite fibre high abrasion resistance of sheath composition, exists.

Patent documentation 1: the spy opens 2003-238775 communique (the 3rd page)

Patent documentation 2: the spy opens 2005-206961 communique (the 3rd page)

Patent documentation 3: the spy opens 2004-36035 communique (claims)

Summary of the invention

The object of the present invention is to provide a kind of crimped yarn and fiber construct that solves above-mentioned problem, the high abrasion resistance of described crimped yarn, taste after the dyeing is good, is made of synthetic fiber, and described synthetic fiber are made of aliphatic polyester resin and thermoplastic polyamide resin.

Above-mentioned problem can realize by following crimped yarn and fiber construct, described crimped yarn is characterised in that, the multifilament (multifilament) that is made of synthetic fiber given curl and obtain, described synthetic fiber are made of aliphatic polyester resin (A) and thermoplastic polyamide resin (B), the area that exposes of aliphatic polyester resin (A) is below 5% with respect to the ratio of fiber surface area, described fiber construct is characterised in that, contains this crimped yarn to small part.

According to the present invention, a kind of synthetic fiber and fiber construct can be provided, described synthetic fiber ABRASION RESISTANCE significantly improves, and can obtain high-quality fiber construct, is suitable for general dress material purposes and industry material applications most.

Description of drawings

[Fig. 1] is used to illustrate transmission electron microscope (TEM) photo of the island structure of polyblend fibre of the present invention.

Scanning electronic microscope (SEM) photo on the fiber top layer of [Fig. 2] crimped yarn of the present invention (embodiment 1).

[Fig. 3] is used to illustrate the sketch of the aspect ratio of the striated ditch that is formed at crimped yarn fiber top layer.

[Fig. 4] is placed on BCF silk of the present invention on the black paper with the multifilament state, the photo of the fiber shape of observing from above.

[Fig. 5] splits into filament with BCF silk of the present invention and is placed on the black paper photo of the fiber shape of observing from above.

The curl sketch of processing unit (plant) of the direct spinning stretching that [Fig. 6] is preferred for making the crimped yarn that is made of polyblend class synthetic fiber of the present invention.

[Fig. 7] is used for illustrating slit length, the slit width of hole depth, the squit hole of manufacture method spinning head of the present invention (spinneret), the sketch in ejection aperture.

[Fig. 8] is used for illustrating the sketch of manufacture method cooling starting point of the present invention.

[Fig. 9] is preferred for making of the present invention by core-sheath-type composite fibre (core composition: the sketch of the curling processing unit (plant) of the direct spinning stretching of the crimped yarn of Gou Chenging aliphatic polyester resin).

The ideograph of the preferred example of the cross sectional shape of [Figure 10] expression core-sheath-type composite fibre of the present invention.

[Figure 11] illustrates the key diagram of the relation of melt viscosity and relative viscosity.

The vertical section ideograph of one of the form of the spinning head that uses in [Figure 12] expression method of the present invention example.

The sketch of one of the device that carries out false twisting processing that uses in [Figure 13] expression embodiments of the invention 52 example.

[Figure 14] is preferred for making of the present invention by core-sheath-type composite fibre (core composition: the sketch of the curling processing unit (plant) of direct spinning stretching of formation crimped yarn polyblend).

Symbol description

1: spinning hopper

2: twin shaft is extruded mixing roll

3: spinning manifold (spinning block)

4: filament spinning component (spinning pack)

5: spinning-nozzle

6: ring-type path (circular chimney) (strand cooling device)

7: strand

8: oiling device 1

9: oiling device 2

10: Stretching rollers (stretch roll)

11: the 1 warm-up mills (1FR)

12: the 2 warm-up mills (1DR)

13: the 3 warm-up mills (2DR)

14: air flow jetting tamponade device (air jet stuffer machine)

15: chill roll

16: the tension detection detector

17: carry-over pinch rolls (take-up roll)

18: the nozzle that interweaves (interlacing nozzle)

19: coiling machine

20: cooling air blows out face

21,65: core composition hopper

22,66: sheath composition hopper

23: the single shaft of core composition side is extruded mixing roll

24: the single shaft of sheath composition side is extruded mixing roll

25,69: spinning manifold

26,70: the gear pump (measuring pump) of core composition side

27,71: the gear pump (measuring pump) of sheath composition side

28,72: filament spinning component

29,73: spinning-nozzle

30,74: the single current cooling device

31,75: strand

32,76: oiling device

33,77: the 1 rollers

34,78: the 2 rollers

35,79: the 3 rollers

36,80: the 4 rollers

37,81: nozzle curls

38,82: chill roll

39,83: the 6 rollers

40,84: the 7 rollers

41,85: bobbin bag (cheese package)

42,86: coiling machine

43: the core composition

44: the sheath composition

45: spinning head 1 (spinning head that has the stream of core composition, sheath composition respectively)

46: spinning head 2 (being about to the preceding spinning head of ejection)

47: nozzle interweaves

48: drawn yarn tube (stretched yarn cheese)

49,51,52,55,61: thread guide (yarn guide)

50: strand

53: donor rollers

54: the 1 heaters

56: coldplate

57: three twisting frames (three axis type twister)

58: draw roll

59: the 2 heaters

60: conveying roller

62: nozzle interweaves

63: thread guide

64: false twist yarn

67: the twin shaft of core composition side is extruded mixing roll

68: the twin shaft of sheath composition side is extruded mixing roll

The specific embodiment

So-called aliphatic polyester resin (A) among the present invention (below be also referred to as " composition A ") is meant that the aliphatic alkyl chain connects the polymer that obtains by ester bond.As the aliphatic polyester resin that uses among the present invention (A), preferably have crystallinity, more preferably fusing point is 150～230 ℃.As the kind of the aliphatic polyester resin that uses among the present invention (A), for example can enumerate PLA, poly butyric ester, polybutylene succinate, polyglycolic acid, polycaprolactone etc.In above-mentioned aliphatic polyester, so PLA fusing point height and good heat stability are most preferably.

Above-mentioned PLA is with-(O-CHCH ₃-CO) _n-as the polymer of repetitive, the oligomer of lactic acid such as polymerization lactic acid or lactide obtains.Lactic acid has D-lactic acid and two kinds of optical isomers of L-lactic acid, so have poly-(D-lactic acid) and poly-(L-lactic acid) and the PLA of only being made up of the D configuration of only being made up of the L configuration of being made up of two kinds of configurations in the above-mentioned polymer.When descending along with the optical purity of D-lactic acid in the PLA or L-lactic acid, the crystallinity of PLA descends, and fusing point descends significantly.In order to keep the heat resistance of fiber, preferred fusing point is more than 150 ℃, more preferably is 160 ℃.More preferably more than 170 ℃, be preferably especially more than 180 ℃.

But, as mentioned above, the silk that obtains with the polymer of two kinds of optical isomers of simple mixing is different, if after the mixed with polymers of above-mentioned two kinds of optical isomers is shaped to fiber, carry out the high-temperature heat treatment more than 140 ℃, make it form the racemic crystallization, become stereocomplex (stereocomplex), then can make fusing point up to 220～230 ℃, comparatively desirable.In such cases, " composition A " is meant the mixture of poly-(L lactic acid) and poly-(D lactic acid), and its mixing ratio is 40/60～60/40 o'clock, can improve the ratio of stereocomplex crystallization, and is ideal.In order to utilize melt spinning to form this stereocomplex crystallization effectively, preferably add crystallization nucleating agent.As crystallization nucleating agent, except that talcum, layered clay mineral matter, can be suitable for and the high stearic acid of PLA intermiscibility or 12-hydroxy stearic acid, stearmide or oleamide, erucyl amide, di-2-ethylhexylphosphine oxide stearmide, ethylenebisstearamide, ethylenebisoleaamide, butyl stearate, glyceryl monostearate, calcium stearate, zinc stearate, dolomol, lead stearate etc.

In addition, having the low molecular weight residue in the PLA is residual lactide, above-mentioned low molecular weight residue cause sometimes stretching or bulk arranging process (bulking progress) in heater pollute or dyeing such as specking occurs in the dyeing manufacturing procedure unusual.And, promote the hydrolysis of fiber or fiberizing product sometimes, reduce durability.Therefore, the residual lactide amount in the PLA is preferably below the 0.3 weight %, more preferably is below the 0.1 weight %, more preferably below the 0.03 weight %.

Composition A for example can also be the material that the composition beyond the copolymerization lactic acid obtains in the scope of not destroying PLA character.As copolymer composition, can enumerate polyalkylene ether glycols such as polyethylene glycol, aliphatic polyester such as polybutylene succinate, polyglycolic acid, aromatic polyesters such as polyethylene glycol isophthalate, and ester bonds such as hydroxycarboxylic acid, lactone, dicarboxylic acids, glycol form the property monomer.Wherein, preferably with thermoplastic polyamide resin's (B) (below be also referred to as " composition B ") the good polyalkylene ether glycol of intermiscibility.The copolymerization ratio of above-mentioned copolymer composition reduces and to cause that in the scope that heat resistance descends be 0.1～10mol% with respect to PLA preferably not influencing fusing point.

Can also in composition A, add modifier such as particle, coloring pigment, crystallization nucleating agent, fire retardant, plasticizer, anti-live agent, antioxidant, ultra-violet absorber or lubricant.As coloring pigment, except that inorganic pigments such as carbon black, titanium oxide, zinc oxide, barium sulfate, iron oxide, can also use organic pigments such as cyanine class, phenylethylene, phthalocyanines, anthraquinone class, purple cyclic ketones (perinone) class, isoindolinone (isoindolinone), quinophthalone (quinophthalone) class, quinacridone (quinacridone) class, thioindigo class etc.Can also use various inorganic particulates such as calcium carbonate or silica, silicon nitride, clay, talcum, kaolin, zirconic acid or modifier such as particle class such as cross-linked polymer particle, various metallics equally.Can also contain polymer such as polyacrylate, various rubber-like, ionomer class, polyurethanes and other thermoplastic elastomer (TPE) classes such as a small amount of wax class, silicone oil, various surfactant, various fluorine type resin, polyphenylene sulfide class, polyamide-based, ethylene acrylate copolymer, methylmethacrylate polymer etc.

As the preferred lubricant that uses among the mentioned component A, can enumerate fatty acid amide and/or fatty acid ester.As fatty acid amide, for example be meant lauramide, palmitamide, stearmide, erucyl amide behenamide, the methylol stearmide, the methylol behenamide, the dihydroxymethyl oleamide, the dimethyl lauramide, the dimethyl stearmide, the saturated fatty acid diamides, the unrighted acid diamides, the compound that has 2 amido links in 1 molecules such as fragrance same clan diamides, for example can enumerate the di-2-ethylhexylphosphine oxide caprylamide, the di-2-ethylhexylphosphine oxide decyl amide, the di-2-ethylhexylphosphine oxide lauramide, di-2-ethylhexylphosphine oxide myristic acid acid amides, the di-2-ethylhexylphosphine oxide palmitamide, the di-2-ethylhexylphosphine oxide stearmide, di-2-ethylhexylphosphine oxide isostearoyl amine, the di-2-ethylhexylphosphine oxide behenamide, the di-2-ethylhexylphosphine oxide oleamide, the di-2-ethylhexylphosphine oxide erucyl amide, the ethylenebis caprylamide, the ethylenebis decyl amide, the ethylenebis lauramide, ethylenebis myristic acid acid amides, the ethylenebis palmitamide, ethylenebisstearamide, ethylenebis isostearoyl amine, ethylidene Shuan behenamide, ethylenebisoleaamide, the ethylenebis erucyl amide, the butylidene bis-stearamides, butylidene Shuan behenamide, the two oleamides of butylidene, the two erucyl amides of butylidene, the hexylidene bis-stearamides, hexylidene Shuan behenamide, the two oleamides of hexylidene, the two erucyl amides of hexylidene, between the xyxylene bis-stearamides, between xyxylene two-12-hydroxyl stearmide, terephthaldehyde's base bis-stearamides, to the benzene bis-stearamides, to the benzene bis-stearamides, N, N '-distearyl adipamide, N, N '-distearyl decanedioyl diamines, N, N '-two oil base adipamide, N, N '-two oil base decanedioyl diamines, N, benzenedicarboxamide between N '-distearyl, N, N '-distearyl terephthalamide, di-2-ethylhexylphosphine oxide hydroxyl stearmide, ethylenebis hydroxyl stearmide, two hydroxyl stearmides of butylidene and the two hydroxyl stearmides of hexylidene etc., in addition, as alkyl substituted type aliphatic acid monoamide, be meant the compound that the hydrogen of acid amides such as saturated fatty acid monoamide or unrighted acid monoamide is replaced by alkyl, for example can enumerate N-lauryl lauramide, N-palmityl palmitamide, N-stearyl stearmide, N-Shan Yu Ji behenamide, N-oil base oleamide, N-stearyl oleamide, N-oil base stearmide, N-stearyl erucyl amide, N-oil base palmitamide etc.Substituting groups such as hydroxyl can be imported in the structure of abovementioned alkyl, and for example methylol stearmide, methylol behenamide, N-stearyl-12-hydroxyl stearmide, N-oil base-12-hydroxyl stearmide etc. are also included within the alkyl substituted type aliphatic acid monoamide of the present invention.

As fatty acid ester, for example can enumerate aliphatic monocarboxylic acid ester classes such as laurate hexadecane ester, laurate phenacylate, myristic acid hexadecane ester, myristic acid phenacylate, the different inferior propyl ester of palmitic acid, palmitic acid dodecane ester, palmitic acid tetradecane ester, palmitic acid pentadecane ester, palmitic acid octadecane ester, cetyl palmitate, palmitic acid phenyl ester, palmitic acid phenacylate, cetyl stearic, behenic acid ethyl ester; Ethylene glycol ester classes such as ethylene glycol monolaurate, glycol monopalmitate, ethylene glycol monostearate; Ethylene glycol diester classes such as ethylene glycol dilaurate, ethylene glycol bisthioglycolate palmitate, glycol distearate; Monoglycerides such as glyceryl monolaurate, monomyristin, glycerine monopalmitate, glyceryl monostearate; Di-glycerides such as dilaurin, glycerine two myristinates, dipalmitin, glycerol distearate; Triglycerides such as trilaurin, myristin, tripalmitin, glycerol tristearate, glycerine two oleic acid monopalmitates, palmitodistearin and glycerine distearyl acid monooleate etc.

Preferred aliphatic acid diamides or the alkyl substituted type aliphatic acid monoamide of using in the above-claimed cpd.Aliphatic acid diamides or alkyl substituted type aliphatic acid monoamide are compared with general aliphatic acid monoamide, acid amides reactive low, so be difficult to during melt molding react with PLA, and, because high molecular weight material is many, so the heat resistance height is difficult for distillation during melt molding, do not destroy function as lubricant, and then the performance excellent lubrication.Aliphatic acid diamides particularly, the reactivity of acid amides is lower, so can more preferably use further preferred ethylenebisstearamide.

In addition, fatty acid amide and fatty acid ester more than two kinds can be used, fatty acid amide and fatty acid ester can also be and used.

In order to bring into play above-mentioned characteristic, the content of fatty acid amide and/or fatty acid ester is necessary for more than the 0.1 weight % with respect to fibre weight.If content is too much, then the mechanical properties of fiber descends sometimes, or when carrying out yellow dyeing, the tone variation is so preferred content is below the 5 weight %.More preferably the content of this fatty acid amide and/or fatty acid ester is 0.2～4 weight %, more preferably 0.3～3 weight %.

In order to improve ABRASION RESISTANCE, preferred polylactic acid polymer has high molecular, if but molecular weight is too high, the tendency that mouldability or draftability descend when then having melt spinning.In order to keep ABRASION RESISTANCE, weight average molecular weight is preferably more than 80,000, more preferably is more than 100,000.More preferably more than 120,000.In addition, if molecular weight greater than 350,000, then as mentioned above, draftability descends, the result makes the molecularly oriented variation, fibre strength descends sometimes.Therefore, weight average molecular weight is preferably below 350,000, more preferably is below 300,000.More preferably below 250,000.Above-mentioned weight average molecular weight is a value of utilizing gel permeation chromatography (GPC) to measure, convert and try to achieve with polystyrene.

The manufacture method of the preferred PLA that uses is not particularly limited among the composition A of the present invention, specifically can enumerate following method: in the presence of organic solvent and catalyst, make the direct dehydrating condensation method (opening flat 6-65360 communique) of the direct dehydrating condensation of lactic acid referring to the spy; In the presence of polymerization catalyst, make at least two kinds of homopolymers carry out the method for copolymerization and ester exchange reaction (opening flat 7-173266 communique) referring to the spy; And after making acid by dehydrating lactic form cyclic dimer, the indirect polymerized method (referring to United States Patent (USP) the 2nd, 703, No. 316 specifications) of carrying out ring-opening polymerization.

The thermoplastic polyamide resin who uses among the present invention (B) is meant the polymer with amido link, as the kind of the thermoplastic polyamide resin who uses among the present invention (B), for example can enumerate polycaprolactam (nylon 6) or polytetramethylene adipamide (nylon 46), polyhexamethylene adipamide (nylon 66), nylon 11 (nylon 11), poly-lauramide (nylon 12), polyhexamethylene sebacamide (NYLON610), polypentamethylene sebacamide (nylon 510) etc.Wherein, consider from the cost of material aspect, preferred nylon 6, in order to improve with the intermiscibility of composition A and then to improve bonding interface, the polyamide that preferred methene chain is long is considered from this respect, preferred nylon 11 or nylon 12, NYLON610, nylon 510.In addition, consider that the preferred non-raw material that derives from oil promptly is the NYLON610 or the nylon 510 of monomer with the decanedioic acid from the raw material aspect that provides carrying capacity of environment to reduce.Polyamide can be a homopolymers, also can be copolymer.Can add particle, fire retardant, anti-live agent among the composition B or be preferred for above-mentioned lubricant among the composition A etc.Need to prove, the solution viscosity of polyamide thermoplastic can utilize known method to measure, under the situation of nylon 6 or NYLON610 etc., use 98% sulfuric acid solution described later to measure, the intrinsic viscosity of nylon 11 can be used m-cresol measured in solution etc.

Generally, if aliphatic polyester has fusing point, its fusing point is generally below 200 ℃, and if fusion surpasses 250 ℃ when storing, then there is the tendency of rerum natura acute exacerbation in not talkative heat resistance height.Therefore, the thermoplastic polyamide resin's of mixing (B) fusing point is preferably 150～250 ℃, more preferably is 150～225 ℃.More preferably 150～205 ℃.But, consider the heat resistance of crimped yarn, the fusing point of preferred thermoplastic polyamide (B) is higher than aliphatic polyester (A).This thermoplastic polyamide resin can be copolymer as mentioned above, but when existing crystallinity to descend, the tendency that ABRASION RESISTANCE also descends is so preferably have crystallinity.

Need to prove, can judge like this among the present invention to have or not crystallinity:, judge that then this polymer has crystallinity if in differential scanning calorimetry (DSC) (DSC) is measured, can observe melting hump.In addition, crystallinity is high more unreasonablely to be thought, can judge as its index with the size of the watery fusion peak heat among the DSC.Watery fusion peak heat Δ H is preferably 30J/g, more preferably is 40J/g, more preferably 60J/g.

Crimped yarn of the present invention is made of synthetic fiber, described synthetic fiber are made of above-mentioned aliphatic polyester resin (A) and thermoplastic polyamide resin (B), aliphatic polyester resin (A) does not expose substantially at fiber surface, and the area that exposes of preferred aliphat mylar (A) is below 5% with respect to the ratio of fiber surface area.As structure with above-mentioned fiber surface form, any one fiber that can pass through in following (1), (2) realizes that (1) " has the polyblend class synthetic fiber that aliphatic polyester resin (A) forms the island structure of island component, thermoplastic polyamide resin (B) formation sea component "; Perhaps (2) " the core composition is made of aliphatic polyester resin (A) or aliphatic polyester resin (A) and thermoplastic polyamide resin's (B) polyblend, the core-sheath-type composite fibre that the sheath composition is made of thermoplastic polyamide resin (B) ".The preferred version of above-mentioned (1) and (2) is as described below.

At first, to one of preferred version, promptly " have the polyblend class synthetic fiber that aliphatic polyester resin (A) forms the island structure of island component, thermoplastic polyamide resin (B) formation sea component " and describe.

Among the present invention, make under the situation of polyblend synthetic fiber at blending constituent A and composition B, blending ratio is not particularly limited, but be island component, be the polyblend of the island structure of sea component that in order to form to have the blending ratio (weight %) of composition A/ composition B is preferably 5/95～55/45 scope with composition B with composition A.In addition, when improving the ratio of composition A, the melt viscosity η a of composition A must be increased, when improving the ratio of composition B, the melt viscosity η b of composition B must be increased.

Under the situation of polyblend class synthetic fiber, must form and be island component, be the polyblend of sea component with composition B with composition A.Because the high more easy more formation of ratio of composition B, so the blending ratio of composition A and composition B more preferably is 10/90～45/55, more preferably 15/85～40/60, most preferably be 20/80～35/65.In addition, (η b/ η is a) preferably in 0.1～2 scope for the ratio of melt viscosity.More preferably be 0.15～1.5, more preferably 0.2～1.Need to prove that the assay method of melt viscosity η describes in detail in the back, measuring temperature and spinning temperature is same temperature, and melt viscosity is at shear rate 1216sec ^-1The value of following mensuration.

In polyblend class synthetic fiber of the present invention, composition A and composition B evenly mix very important, and so-called here even mixing is meant following state.Promptly, utilize transmission electron microscope (TEM) (40,000 times) when observing the cross-sectional slices of these synthetic fiber, can be observed so-called island structure as shown in Figure 1, be the island structure of island component as sea component, to form slightly circular dispersion component (white portion) promptly with continuous matrix components (black part), and, constitute island component composition A farmland size (domain size) with diameter convert (suppose that farmland (domain) be a circle, the diameter that obtains by the area conversion on farmland) be little state to 0.001 μ m～2 μ m.Farmland size by making island component can improve the ABRASION RESISTANCE of fiber in above-mentioned scope tremendously.Need to prove, the area ratio that exposes of aliphatic polyester resin (A) can be by observing the fiber periphery integral body in the above-mentioned TEM image in the polyblend class synthetic fiber, be determined at the exposed length and the fiber periphery length of the white portion (aliphatic polyester resin) that fiber surface exposes respectively, obtain this length ratio, thereby calculate.

Because the farmland size is more little, the stress at interface is disperseed more, thus improve with the cementability of the composition B that constitutes sea component, and there is the tendency of initial wear decline in the farmland when being of a size of size below certain certain value.Therefore, the farmland, island is preferably dimensioned to be 0.005 μ m～1.5 μ m, more preferably is 0.02 μ m～1.0 μ m.In addition, in order to control the reflecting feel of crimped yarn, further preferably make the farmland diameter in specific scope.By making this farmland diameter cover 1/5 wavelength (0.08 μ m～0.16 μ m) of wavelength of visible light scope (0.4 μ m～0.8 μ m) and this wavelength, can produce appropriate light scattering at fibrous inside, thus the high reflecting feel of taste of moistened (dewy).In order to show beautiful reflecting feel, preferred farmland diameter is in the scope of 0.08 μ m～0.8 μ m.

Need to prove that above-mentioned farmland size is meant 100 farmlands of per 1 crimped elastic filament sample instrumentation as described in the G of the following embodiment item among the present invention, remove the distribution of 80 values after 10 farmland diameter maximums and 10 the farmland diameter minimum of a values.

When the raw material that constitutes crimped yarn of the present invention is polyblend class synthetic fiber, different with the block copolymer that aliphatic polyester block and polyamide-block in 1 strand alternately exist, aliphatic polyester strand (composition A) and polyamide strand (composition B) are independent in fact to be existed, and this is very important.The fusing point of thermoplastic polyamide resin before and after the difference of this state can cooperate by observation descends, promptly comes from the fusing point of the thermoplastic polyamide resin in the polyblend and compares what kind of degree that descends with the fusing point that cooperates preceding thermoplastic polyamide resin, infers.If it is below 3 ℃ that thermoplastic polyamide resin's fusing point descends, then aliphatic polyester and polyamide are gone up substantially copolymerization (the ester-acid amide exchange does not take place basically) are not taken place, and are in the self-existent in fact polyblend state of aliphatic polyester strand and polyamide strand.Because the fiber top layer comes down to the thermoplastic polyamide resin as sea component, reflects the characteristic that above-mentioned thermoplastic polyamide resin is intrinsic, ABRASION RESISTANCE improves tremendously.So the fusing point of the polyamide that cooperates among the present invention descends and is preferably below 2 ℃.

When the raw material that constitutes crimped yarn of the present invention was polyblend class synthetic fiber, the formation aliphatic polyester resin was that island component, thermoplastic polyamide resin are the island structure of sea component.By the farmland size of control island component, can improve ABRASION RESISTANCE tremendously, can show gloss simultaneously with feeling of high class.

As mentioned above, aliphatic polyester and polyamide do not react (the ester-acid amide exchange does not take place basically) usually substantially, so the bonding interface of above-mentioned two kinds of polymer is still so not high.Therefore, (following be also referred to as sometimes " composition C ") improves bonding interface tremendously by further interpolation phase solvation, can improve ABRASION RESISTANCE.As long as composition C can improve the bonding interface of composition A and composition B, be not particularly limited, the compound that has two above reactive with active hydrogen groups in a part can improve bonding interface tremendously, so preferred.By in composition A and/or composition B, adding the compound that has two above reactive with active hydrogen groups in a part, melting mixing, carry out spinning, because any one composition among this compound and composition A and the composition B all reacts the formation cross-linked structure, so can suppress interface peel.

Herein, the reactive with active hydrogen group is meant and is present in the COOH end group of polylactic resin or thermoplastic polyamide resin's end or OH end group, NH ₂End group has reactive group, for example preferably uses glycidyl, oxazolinyl, carbodiimide, '-aziridino, imino group, isocyanate group, maleic anhydride base etc.Manufacture method at crimped yarn of the present invention is that melt spinning is at the lower temperature compacted under below 250 ℃, so select the good group of low-temp reaction.The preferred glycidyl, oxazolinyl, carbodiimide, anhydride group (group (being also referred to as the maleic anhydride base sometimes) that is generated by maleic anhydride etc.) of using especially preferably uses glycidyl, carbodiimide in the above-mentioned reactive group.As long as have above-mentioned reactive group more than two, can satisfy effect as the phase solvation.And if have reactive group in a part greater than 20, excess stickiness increases when then having spinning, the tendency that stringiness reduces is so the number of the reactive with active hydrogen group in a part is preferably more than 2, below 20.More preferably below 10, more preferably below 3.The kind of reactive group can comprise multiple in a part.Above-mentioned have the compound of 2 above reactive with active hydrogen groups if weight average molecular weight is the compound of 250～30,000 molecular weight, and so the heat resistance during melt molding, dispersed good then is preferably.More preferably be 250～20,000.

As compound with above-mentioned reactive group, if graft copolymerization has the copolymer of the side chain of reactive group on the main chain of polymer, then can in 1 molecule, import a plurality of functional groups, and generally thermal property such as fusing point also becomes stable, so preferred.The polymer that becomes the main chain of this reactive group of grafting can be selected arbitrarily, consider from synthetic difficulty or ease aspect, can suitably select polyester polymer, acrylic polymers such as polyacrylate, polymethyl methacrylate, polyalkyl methacrylate, the polystyrene base polymer, polyolefin polymers etc.

Among the operable in the present invention composition C, as compound, for example can enumerate with compound and be polymer of monomers, becoming the compound that the graft copolymerization glycidyl obtains on the polymer of main chain compound and polyether units end have glycidyl with glycidyl with glycidyl.As above-mentioned monomer, can enumerate glycidyl acrylate, glycidyl methacrylate etc. with glycidyl.In addition, except that above-mentioned monomer, can also wait the reactivity of controlling glycidyl by co-polypropylene acid long-chain alkyl groups.If with the compound with glycidyl is that the mean molecule quantity of polymer of monomers or the polymer that becomes main chain is 250～30,000 scope, so the rising of melt viscosity in the time of then can suppressing high concentration and add is preferably.More preferably weight average molecular weight is 250～20,000 scope.In addition, has the compound heat resistance height of two above glycidyl unit on the triazine ring, so also preferred.For example, preferably use triglycidyl isocyanurate (TGIC), monoene propyl group diglycidyl isocyanuric acid ester (MADGIC) etc.

In addition, Dui Yu oxazolinyl, carbodiimide, '-aziridino, imino group, isocyanate group, maleic anhydride base are too.The compound that wherein has carbodiimide has extremely good low-temp reaction, so more preferably.For example; example as carbodiimide compound; can enumerate the diphenyl carbodiimide; dicyclohexylcarbodiimide; two-2; 6-3,5-dimethylphenyl carbodiimide; DIC; two (octadecyl) carbodiimide; two-adjacent toluyl groups carbodiimide; two-to the toluyl groups carbodiimide; two-p-nitrophenyl carbodiimide; two-p-aminophenyl carbodiimide; two-p-hydroxybenzene carbodiimide; two-rubigan carbodiimide; two-Chloro-O-Phenyl carbodiimide; two-3; 4-dichlorophenyl carbodiimide; two-2; 5-dichlorophenyl carbodiimide; to benzene-two-adjacent toluyl groups carbodiimide; to benzene-two-dicyclohexylcarbodiimide; to benzene-two-two-rubigan carbodiimide; 2; 6; 2 '; 6 '-tetra isopropyl diphenyl carbodiimide; hexa-methylene-two-carbodicyclo hexylimide; ethylidene-diphenyl carbodiimide; ethylidene-dicyclohexylcarbodiimide; N; N '-two-adjacent toluyl groups carbodiimide; N; N '-diphenyl carbodiimide; N; N '-two (octadecyl) carbodiimide; N; N '-two-2; 6-3,5-dimethylphenyl carbodiimide; N-toluyl groups-N '-carbodicyclo hexylimide; N; N '-two-2; 6-diisopropyl phenyl carbodiimide; N; N '-two-2; 6-two-tert-butyl-phenyl carbodiimide; N-toluyl groups-N '-phenyl carbons diimine; N; N '-two-p-nitrophenyl carbodiimide; N; N '-two-p-aminophenyl carbodiimide; N; N '-two-p-hydroxybenzene carbodiimide; N; N '-dicyclohexylcarbodiimide; N; N '-two-to the toluyl groups carbodiimide; N; N '-benzyl carbodiimide; N-octadecyl-N '-phenyl carbons diimine; N-benzyl-N '-phenyl carbons diimine; N-octadecyl-N '-tolyl carbodiimide; N-cyclohexyl-N '-tolyl carbodiimide; N-phenyl-N '-tolyl carbodiimide; N-benzyl-N '-tolyl carbodiimide; N; N '-two-adjacent ethylphenyl carbodiimide; N; N '-two-to the ethylphenyl carbodiimide; N; N '-two-o-isopropyl phenyl carbodiimide; N; N '-two-p-isopropyl phenyl carbodiimide; N; N '-two-adjacent isobutyl phenenyl carbodiimide; N; N '-two-to the isobutyl phenenyl carbodiimide; N; N '-two-2; 6-diethyl phenyl carbodiimide; N; N '-two-2-ethyl-6-isopropyl phenyl carbodiimide; N; N '-two-2-isobutyl group-6-isopropyl phenyl carbodiimide; N; N '-two-2; 4; 6-trimethylphenyl carbodiimide; N; N '-two-2; 4; 6-triisopropyl phenyl carbodiimide; N; N '-two-2; 4; single or two carbodiimide compounds such as 6-three-isobutyl phenenyl carbodiimide; poly-(1; 6-hexylidene carbodiimide); poly-(4; 4-methylene dicyclohexylcarbodiimide); poly-(1; 3-cyclohexylidene carbodiimide); poly-(1; 4-cyclohexylidene carbodiimide); poly-(4; 4 '-diphenyl-methane carbodiimide); poly-(3; 3 '-dimethyl-4,4 '-diphenyl-methane carbodiimide); poly-(naphthalene carbodiimide); poly-(to the phenylene carbodiimide); poly-(metaphenylene carbodiimide); poly-(tolyl carbodiimide); poly-(DIC); poly-(methyl-diisopropyl phenylene carbodiimide); poly-(triethyl group phenylene carbodiimide); poly-poly-carbodiimides such as (triisopropyl phenylene carbodiimides) etc.Wherein preferred N, N '-two-2,6-diisopropyl phenyl carbodiimide, 2,6, the polymer of 2 ', 6 '-tetra isopropyl diphenyl carbodiimide.

Reactive with active hydrogen group more than two can be identical reactive group, also can be different groups, in order to control reactivity, is preferably identical reactive group.

Remove the above-mentioned compound with reactive with active hydrogen group as the compound of composition C, polyalkylene ether glycol can improve ABRASION RESISTANCE specifically, so preferably.As this compound, for example can enumerate polyethylene glycol, polypropylene glycol, polytetramethylene glycol etc., wherein, and in heat resistance, dispersiveness, in price, preferred molecular weight 400～20,000 polyethylene glycol.More preferably molecular weight 600～6,000 polyethylene glycol.More preferably with this compound two terminal-modified be glycidyl.Also preferred and above-mentioned compound and usefulness with two above reactive with active hydrogen groups.

When making synthetic fiber of the present invention, be fiber at 200～250 ℃ of following melt moldings usually, so require to have the high-fire resistance that can tolerate this temperature as the compound of composition C.Hot reduction rate when therefore, preferably measuring 200 ℃ that obtain by thermogravimetric (TG) is below 3%.If hot reduction rate surpasses 3%, following problem appearring sometimes then: because pyrolysate oozes out during spinning, pollutes spinning-nozzle and device for spinning, reduce spinnability, the tendency that exists thermal decomposition gas to be fuming simultaneously operating environment is worsened.More preferably hot reduction rate is below 2%, more preferably below 1%.Need to prove that 200 ℃ of hot reduction rates are to utilize thermogravimetric (TG) to measure, and are warming up to 300 ℃ from normal temperature (10～30 ℃) with 10 ℃/minute speed under blanket of nitrogen, the reduction rate when obtaining 200 ℃ obtains.

The mixing ratio of farmland size, composition A and the composition B of dispersed and reactive, the island component the when addition of composition C can be according to the equivalent of the reactive group of per unit weight compound used therefor, fusion is suitably determined.Consider that from suppressing the interface peel aspect preferably with respect to the total amount (100 weight %) of composition A, composition B and composition C, the addition of composition C is more than the 0.005 weight %.More preferably be more than the 0.02 weight %, more preferably more than the 0.1 weight %.If the addition of composition C is very few, the interfacial diffusion between two compositions sometimes then, reacting dose is few, and the effect that improves bonding interface is limited.On the other hand, bring into play performance in order to make composition C under the prerequisite that does not hinder the characteristic that becomes the composition of fiber base material A and composition B, spinnability, the addition of preferred component C is below the 5 weight %, more preferably is below the 3 weight %.More preferably below the 1 weight %.

By adding ingredient C as mentioned above, can seal the terminal carboxyl group of aliphatic polyester, improve the hydrolytic resistance of aliphatic polyester.Terminal carboxyl group with autocatalysis is preferably low concentration, and total end carboxy concentration is preferably 15 equivalents/below the ton in the aliphatic polyester, more preferably is 10 equivalents/below the ton, more preferably 0～7 equivalent/ton.

And then, for the reaction of the compound that promotes to have above-mentioned reactive group, be carboxylic acid metal's salt catalyst of alkali metal, alkaline-earth metal if add carboxylic acid metal salt catalyst, particularly metal, can improve reaction efficiency, so preferably.Wherein, the catalyst that preferably uses sodium lactate, calcium lactate, magnesium lactate etc. to form based on lactic acid.In addition, in order to prevent to add the resin heat resistance reduction that catalyst causes, also can use or also use the bigger catalyst of Metallic stearates equimolecular quantity separately.In addition, from controlling dispersiveness, the consideration of reactive aspect, the addition of this catalyst is preferably 5～2000ppm with respect to synthetic fiber.More preferably be 10～1000ppm, more preferably 20～500ppm.

Preferably contain at least a crystallization nucleating agent that is selected from talcum, sorbitol derivatives, phosphate slaine, the no machine aluminium compound of alkalescence, the melamine compound salt in the crimped yarn of the present invention.This crystallization nucleating agent mainly is at the high crystallization nucleating agent of PLA validity in the aliphatic polyester resin (A).By adding this crystallization nucleating agent, can form the good crimped yarn of fastness that curls and be difficult to launch.

Talcum as crystallization nucleating agent has high crystallization characteristic, the average grain diameter D of preferably talc in the mechanical characteristic that keeps fiber ₅₀Be below the 5 μ m, and particle diameter is that the above talcum of 10 μ m is below 0～4.5 volume % with respect to the talcum total amount.By making the average grain diameter D of talcum ₅₀Be below the 5 μ m, can improve effect tremendously by increasing specific area as crystallization nucleating agent.Therefore, the particle diameter of talcum is preferably below the 4 μ m, more preferably is below the 3 μ m.Most preferably be below the 1.5 μ m.Need to prove the average grain diameter D of talcum ₅₀Lower limit be not particularly limited, but the more little compendency of particle diameter is high more, the dispersed variation in polymer is so be preferably more than the 0.2 μ m.Preferable particle size is that the above talcum of 10 μ m is below the 4.5 volume % with respect to the talcum total amount.If contain thick talcum, then not only spinnability descends, and also there is the tendency of decline in the mechanical characteristic of fiber.Therefore, particle diameter more preferably is 0～3 volume % greater than the content of the talcum of 10 μ m with respect to the talcum total amount, and more preferably 0～2 volume % most preferably is 0 volume %.

Need to prove that the particle diameter of the talcum of record is the value of being tried to achieve by the size distribution of utilizing the system SALD-2000J of (strain) Shimadzu Seisakusho Ltd., measure by laser diffractometry in above-mentioned (1) and (2).

As the sorbitol derivatives that is preferably used as crystallization nucleating agent, comprise the sorbitol derivatives that dibenzylidene sorbitol, two (to the methyl benzal) D-sorbite, two (to the ethyl benzal) D-sorbite, two (to the chlorine benzal) D-sorbite, two (to the bromine benzal) D-sorbite and the above-mentioned sorbitol derivatives of chemical modification obtain.

As phosphate slaine or the no machine aluminium compound of alkalescence, the special compound of putting down in writing in the 2003-192883 communique of opening of preferred use.

As melamine compound, can use the hydrogen of the amino of melamine, melamine to be replaced the hydrogen of amino of the substituted melamine compound (spy opens flat 9-143238 communique) that obtains, melamine by alkyl, alkenyl, phenyl by hydroxy alkyl, hydroxy alkyl (oxa alkyl) _nBase, aminoalkyl replace substituted melamine compound (spy opens flat 5-202157 communique), melam, melem, the mellone (mellon), 1 that obtains, 1-dimethyl cyclohexane-3, guanamines classes such as the deamination condensation product of 5-diketone melamines such as (methone), benzoguanamine, acetylguanamine etc.As melamine compound salt, can enumerate acylate or inorganic acid salt.As acylate, can enumerate aromatic carboxylic acid salts such as carboxylates such as isocyanurate, formic acid, acetate, ethanedioic acid, malonic acid, lactic acid, citric acid, benzoic acid, M-phthalic acid, terephthalic acid (TPA) etc.Above-mentioned acylate can use a kind separately, perhaps is mixed with two or more.Melamine isocyanurate most preferably in the above-mentioned acylate.The melamine isocyanurate can use with metal oxide sols such as silica, aluminium oxide, antimony oxides and carry out material (spy opens flat 7-224049 communique) that surface treatment obtains, carries out material (spy opens flat 5-310716 communique) that surface treatment obtains, carries out the material (spy opens flat 6-157820 communique) that surface treatment obtains with HLB1～8 nonionic surface active agent with polyvinyl alcohol or cellulose ethers.Melamine compound and organic acid mol ratio are not particularly limited, and do not contain the free melamine compound or the organic acid that do not form salt in the preferred salt compound.The preparation method of the acylate of melamine compound is not particularly limited, and generally can make melamine compound and organic acid hybrid reaction in water, filters then or dephlegmate, makes crystalline powder by drying and obtains.As inorganic acid salt, can enumerate alkylsulfonates such as hydrochloride, nitrate, sulfate, pyrosulfate, methanesulfonic acid, ethyl sulfonic acid, alkylbenzenesulfonate such as p-methyl benzenesulfonic acid, DBSA, sulfamate, phosphate, pyrophosphate, polyphosphate, phosphonate, Phenylphosphine hydrochlorate, alkyl phosphonate, phosphite, borate, tungstates etc.Preferred polyphosphoric acid melamine, polyphosphoric acid melamine melam melem double salt, tosilate in the above-mentioned inorganic acid salt.The mol ratio of melamine compound and inorganic acid is not particularly limited, and does not contain the free melamine compound or the inorganic acid that do not form salt in the preferred salt compound.The preparation method of the inorganic acid salt of melamine compound is not particularly limited, and generally, can make melamine compound and inorganic acid hybrid reaction in water, filters then or dephlegmate, makes crystalline powder by drying and obtains.The preparation method of pyrophosphate or polyphosphate for example is recorded in United States Patent (USP) the 3rd, 920, and No. 796 specifications, spies open flat 10-81691 communique, the spy opens in flat 10-306081 communique etc.

The addition of crystallization nucleating agent and the mechanical characteristic of fiber are inverse relation, so, be 0.01～2 weight % with respect to the preferred addition of aliphatic polyester (A).If addition is more than the 0.01 weight %, after then coming out from the air flow jetting tamponade device, the rapid crystallization of aliphatic polyester in refrigerating work procedure is so can form the good crimped yarn of firmness that curls.In addition, be below the 2 weight % by making addition, can suppress to form the good crimped yarn of firmness that curls when mechanical characteristic descends.The addition of crystallization nucleating agent more preferably is 0.05～1.5 weight %, more preferably 0.2～1 weight %.

In order to improve fast light fastness, preferably in crimped yarn of the present invention, add Cu salt, K salt, Mn salt, Cr salt, tannic acid etc.Particularly CuI, KI are effective to the light resistance that improves polyamide.The compound that adds can be a kind, perhaps multiple and usefulness.With respect to thermoplastic polyamide resin (B), the addition of above-claimed cpd can be 0.001～0.5 weight %, more preferably is 0.005～0.2 weight %, more preferably 0.01～0.1 weight %.

Preferably the fiber surface at crimped yarn of the present invention forms the axially extended striated ditch of fiber.As shown in Figure 2, this striated ditch is the concavity ditch that is present in fiber surface, roughly (is 10 ° with interior angle with respect to fiber axis) with fiber axis to abreast and extends.Utilize the scattering of this striated ditch appropriateness to be absorbed into light in the ditch that is mapped to fiber surface, can give moist taste high gloss.In order to produce scattering effectively, the width of this striated ditch is preferably 0.01 μ m～1 μ m, more preferably is 0.05 μ m～0.9 μ m, more preferably 0.08 μ m～0.8 μ m.The aspect ratio of this striated ditch (width of the long axis length of striated ditch/striated ditch) greatly when 3～50 scope, can be given good reflecting feel under the situation of not damaging ABRASION RESISTANCE.Can utilize electron microscope (SEM) to observe the striated ditch.In the SEM picture, by 5,000 times of common amplifications, amplify 1 as required, 000～10,000 times photo is defined as the maximum of the width of striated ditch the width of this striated ditch, measure the width of 10 striated ditches, with the width of its mean value as striated ditch of the present invention.At above-mentioned 10 striated ditches,,, obtain the aspect ratio (referring to Fig. 3) of each striated ditch with the long axis length of this air line distance as the striated ditch with the two ends of straight line connection striated ditch.Have 1～500 in the scope of quantity 10 μ m * 10 μ m in the SEM picture by making this striated ditch, can not damage ABRASION RESISTANCE, and present good gloss, so preferred.More preferably be 3～40, more preferably 5～30.

In order to keep the higher working procedure processing and the mechanical strength of product, the intensity of preferred crimped yarn of the present invention is more than the 1cN/dtex, more preferably is more than the 1.5cN/dtex.More preferably more than the 2cN/dtex, be preferably more than the 3cN/dtex especially.Air flow jetting method stuffer box crimping elastic filament (hereinafter referred to as " BCF silk ") with above-mentioned intensity can utilize the melt spinning described later bulk manufactured that stretches.Elongation at break is 15～70% o'clock, and the working procedure processing when making fibre is good, so preferred.More preferably be 20～65%, more preferably 30～55%.Crimped yarn with above-mentioned degree of stretching can utilize the melt spinning described later bulk manufactured that stretches.At this moment, consider that from the viewpoint of the high-performance crimped yarn of making elongation at break also preferably making intensity sometimes is below the 4cN/dtex with above-mentioned scope.

The boiling water shrinkage of crimped yarn is 0～15% o'clock, and the DIMENSIONAL STABILITY of fiber and fibre is good, so preferred.More preferably be 0～12%, more preferably 0～8%, most preferably be 0～3.5%.

The polyblend fibre of existing aliphatic polyester and polyamide is called Barus effect (Barus effect) because the surface tension between polymer when melt spinning, the expansion of diameter for 1.5～10 times in ejection aperture takes place under squit hole.Therefore, the thickness inequality takes place easily in the refinement deforming process of spinning, quality problems such as broken string or evenness fault take place sometimes.Fiber of the present invention as described later, kind by polymer, the optimal design of melt viscosity, the control of spinning head ejection linear velocity, the optimization of the cooling condition under the spinning head, the control of spinning speed, successfully reduce Barus effect, simultaneously, even the expansion that Barus effect causes takes place, also can be by making as close as possible spinning head surface, elongational flow zone, and (shorten from being ejected to the distance that the refinement distortion finishes) fast and stretch, fiber stably formed.Therefore, the evenness fault of strand long axis direction is also little.In order to improve working procedure processing, to suppress the uneven dyeing after the dyeing, the evenness fault of preferred crimped yarn of the present invention (Wu Site irregular (Uster unevenness), U%, normal state value (Normal value)) be below 2%, more preferably be below 1.5%.More preferably below 1%.

Crimped yarn of the present invention is preferably " BCF silk " (BCF: varicosity continuous filament yarn, bulked continuous filament) that uses air flow jetting tamponade device described later to obtain.So-called BCF silk, be to utilize the turbulence effects add hot fluid (dry air etc.) to make filament (filament) have the wrapped configuration of irregular winding ring-type, in the 1st chapter (25～39 pages) of " filament process technology handbook (last volume) " that Japanese fibre machinery association compiles, its form described in detail.Utilize the example of the fiber shape photo explanation BCF filament shapes of Fig. 4 and Fig. 5 below.Fig. 4 is placed on the photo of observing on the black paper and obtaining with BCF silk of the present invention with the multifilament state, and Fig. 5 is that the multifilament with Fig. 4 is divided into filament, is placed on the photo of observing on the black paper and obtaining.As shown in Figure 4, on irregular direction, form filamentary ring, have the wrapped configuration that 2 above filaments twine mutually.As shown in Figure 5, amplitude, the cycle of the ring that has of filament are irregular.As mentioned above, the BCF silk has following form: filament is looped-shaped bending on irregular direction respectively, and the amplitude of ring is irregular, and not periodically, twines mutually between this filament.In addition, the BCF silk does not have the overbending part, bulkiness (bulkiness) height not only, and with false twist yarn etc. relatively, (residual torque) is little in residual torque, owing to have above-mentioned feature, and when crimped yarn or the fibre that uses crimped yarn to form are worn, external force is dispersed to each filament easily, is difficult for causing the distortion to external force resistance.

Crimp extension rate after the preferred boiling water treating of crimped yarn of the present invention is 3～30%, more preferably is 5～30%, more preferably 8～30%, be preferably 12～30% especially.Herein, the mensuration of the crimp extension rate after the boiling water treating is following carries out.

Unclamp crimped yarn from the package (crimped yarn batches drum or bobbin (bobbin)) of the atmosphere of 25 ± 5 ℃ of environment temperatures, relative humidity 60 ± 10%, placing more than 20 hours, with this crimped yarn with no load condition impregnation process 30 minutes in boiling water.After the processing, air-dry 1 (about 24 hours) round the clock in above-mentioned environment, with this crimped yarn as the crimped yarn sample after the boiling water treating.This sample is applied the initial load of 1.8mg/dtex, after 30 seconds, locate to mark at the long 50cm of sample (L1).Then, the mensuration load that applies 90mg/dtex replaces initial load, after 30 seconds, measures sample long (L2).And utilize crimp extension rate (%) after following formula is obtained boiling water treating.

Crimp extension rate (%)=[(L2-L1)/L1] * 100.

If the crimp extension rate after the boiling water treating of above-mentioned crimped yarn is lower than 3%, then can not demonstrate fully curlingly, lack bulkiness, when for example making carpet etc., cause not having sense of fullness sometimes.On the other hand, be difficult to make crimp extension rate after the boiling water treating greater than 30% crimped yarn, surpass 30% if this crimp extension rate is brought up to, then cause the intensity of crimped yarn significantly to descend sometimes, perhaps cause curling inequality or silk thickness are unequal.

The long-term use of crimped yarn of the present invention after dyeing or bulk processing etc. are used for making the manufacturing procedure of cloth and silk structure or make goods, curling is difficult for launching, and can keep the outward appearance of goods for a long time, so preferred.Therefore, being preferably more than 2% as the firmness index of curling in the crimp extension rate after the boiling water treating under the 2mg/dtex load (hereinafter referred to as " percentage elongation under the restriction load ").Restriction load percentage elongation down more preferably is more than 3%, more preferably more than 5%.The upper limit is not particularly limited, in the technology of the present invention, being boundary about height to 15%.Need to prove that restriction load percentage elongation down can utilize the method for putting down in writing among the embodiment to measure.

The cross sectional shape that constitutes the polyblend class synthetic fiber of crimped yarn of the present invention can freely be selected from multiple leaf-shaped section, flat cross section, W cross section, X cross section and other odd-shaped cross sections such as circular section, hollow section, porous hollow section, trifoil cross-section, for the bulkiness that improves crimped yarn is made the fiber construct with sense of fullness, preferred degree of profile (D1/D2) is 1.2～7 odd-shaped cross section.The degree of profile of odd-shaped cross section silk is high more, can form the fiber construct with sense of fullness more, and degree of profile is when too high, and the flexural rigidity of fiber uprises, and flexibility descends, and has problems such as fiber ruptures (fibrillation), gloss is twinkling sometimes.Therefore, degree of profile is more preferably in 1.3～5.5 scope, further preferably in 1.5～3.5 scope.

Manufacture method as the crimped yarn that is made of polyblend class synthetic fiber of one of preferred version of the present invention is not particularly limited, and for example, can use the direct spinning stretching shown in Figure 6 processing unit (plant) that curls, and adopts following method to make.

That is, in above-mentioned aliphatic polyester resin (A) and thermoplastic polyamide resin's (B) the combination, the blending ratio (weight %) that preferably makes composition A and composition B is in 5/95～55/45 scope, and (η b/ η is a) in 0.1～2 scope to make the ratio of melt viscosity simultaneously.At this moment, when the blending ratio of composition A is 5～15 weight % near the ratio of the lower limit of above-mentioned blend range, for example composition A, the ratio of melt viscosity can be up to 0.8～2, but when the blending ratio of composition A is 45～55 weight % near the ratio of the upper limit, for example composition A, the ratio that must make melt viscosity is 0.1～0.3, even thermoplastic polyamide resin's (composition B) melt viscosity is low to moderate 1/10～3/10 of aliphatic polyester resin (composition A).This is because the form of the crimped yarn that is made of polyblend fibre of the present invention is the island structure silk that aliphatic polyester resin (A) forms island component.Need to prove, in the above range, be island component if the ratio of composition A 0.2～1 the scope of in the scope of 15～45 weight %, then can being set in by the ratio with melt viscosity makes aliphatic polyester.Need to prove that (the melt viscosity η of η b/ η a) time uses under the temperature identical with spinning temperature, with shear rate 1216sec to calculate the ratio of above-mentioned melt viscosity ^-1The value of measuring.

Next, utilize the combination of above-mentioned polymer property and blending ratio, use twin shaft mixing roll etc. carries out granulating, perhaps carries out melt spinning after mixing, with polyblend fibreization.The interpolation of phase solvation (composition C) can be added when mixing composition A and composition B; about adding method; can directly the phase solvation be supplied to mixing roll; also can be simultaneously mixing with composition A, composition B; make the master batch (master pellet) that contains high concentration composition C in advance; the particle of this master batch with composition A and composition B mixed, supply to the twin shaft mixing roll.Need to prove that during master batch, the reaction that suppresses the phase solvation as far as possible is very important in advance, so the composition A that preferred utilization can reduce forming temperature makes master batch.The reason that suppresses the reaction of phase solvation as far as possible is to prevent that in order to do one's utmost this phase solvation reactive group one-sided composition in reaction system from reacting.

Preferably in melt extruding, the sleeve when mixing (jacket) temperature is a benchmark with the fusing point (hereinafter referred to as Tmb) of polyamide thermoplastic (composition B), carries out under Tmb+3 ℃～Tmb+30 ℃, and shear rate is 300～9800sec ^-1By making sleeve temperature and shear rate in above-mentioned scope, can when making fiber, obtain farmland of the present invention diameter, form uncoloured polyblend fibre simultaneously.If the sleeve temperature surpasses above-mentioned scope, perhaps shear rate surpasses 10000sec ^-1, take place to shear heating, then the painted purposes of the crimped yarn of gained that causes of polymer is restricted sometimes.

Equally, in order not destroy above-mentioned island structure and can to prevent paintedly, preferred spinning temperature is low as far as possible, is preferably set to Tmb+3 ℃～Tmb+40 ℃.More preferably spinning temperature is Tmb+3 ℃～Tmb+30 ℃, more preferably Tmb+3 ℃～Tmb+20 ℃.

In order to suppress the aggegation again in filament spinning component of farmland, island, and then control farmland diameter, the filtering layer (blender (blend mixer) (static mixer or high blender (high mixer)) in the little nonwoven fabric filter (filtering footpath 5 μ m～30 μ m) in #100～#200) or porous metals, filtration footpath, the assembly of high order number can be installed.Particularly be about to before the spinning head ejection, utilizing and filter the following nonwoven fabric filter of footpath 20 μ m, it is disperseed again, this is extremely effective to control farmland diameter, so preferred.

And then the polymeric blends of aliphatic polyester and polyamide is immiscible system, and molten mass shows the epistasis energy in the elasticity item, exists the expansion that is caused by Barus effect to become big tendency.Therefore, for the strand that suppresses to be caused by Barus effect expands, and make it stably extend refinement simultaneously, improve the spinning state, the ejection linear velocity of preferred spinning head squit hole is 0.02～0.4m/ second, more preferably is 0.03～0.3m/ second, more preferably 0.04～0.2m/ second.It is also effective to suppressing Barus effect to increase the squit hole degree of depth.Herein, the squit hole degree of depth is meant from the entrance hole lower end to the length that sprays face shown in Fig. 7 (a).In addition, the squit hole degree of depth during circular hole is meant from drawing subordinate's end in to the length that sprays face shown in Fig. 7 (b).The squit hole degree of depth is preferably 0.3～5mm, more preferably is 0.4～5mm, more preferably 0.5～5mm.

During the ejection strand, must make as close as possible spinning head surface, elongational flow zone, and (shorten) the spray silk fast from spraying the distance that finish to the refinement distortion back.Therefore, the more close spinning head of the cooling starting point surface of ejection strand is comparatively desirable, preferably begins to cool down in the position of the essence vertical lower 0.01～0.15m on spinning head surface.Need to prove, as amplified the shown in Figure 8 of spinning portion, line a is flatly marked in the upper end that blows out face from cooling air, mark vertical line b downwards from the spinning head surface, the intersection point c of line a and line b is the cooling starting point of essence vertical lower, and vertical line b goes up from the distance c d of spinning head surface d to c and is preferably 0.01～0.15m.The cooling starting point more preferably is the essence vertical lower 0.01～0.12m on spinning head surface, more preferably the essence vertical lower 0.01～0.08m on spinning head surface.

Above-mentioned cooling means can be to the uniflow type path of cooling off (uniflowtype chimney) from folk prescription, also can be laterally or the ring-type path of blowing cooling air from the inboard, lateral of strand from the inboard of strand, but from can be evenly and the aspect of cooling fast consider the preferred ring-type path of cooling off to the outside from the inboard of strand.At this moment, preferably cool off to multifilament air blowing body perpendicular to the direction of multifilament from essence.The vertical direction of so-called herein essence as shown in Figure 8, the streamline that is meant cooling air is with respect to line b approximate vertical (tilting 70～110 °).Need to prove, be not particularly limited, preferably use rare gas, nitrogen or the air such as argon, helium of stable (reactivity is extremely low) normal temperature under, nitrogen or air that wherein preferred especially use can cheap supply as the gas of cooling air.

The speed of the cooling air of this moment is preferably 0.3～1m/ second, more preferably is 0.4～0.8m/ second.In order to cool off strand fast, the temperature of cooling air is preferably low temperature, considers the cost of air-conditioning simultaneously, and working control is comparatively desirable at 15～25 ℃.As mentioned above, combination by particular polymers, can form island structure of the present invention, in addition, by the control spinning temperature, its ejection can be under the situation of not damaging island structure, made, and, polyblend fibre of the present invention can be stably spun and derive first by controlling ejection linear velocity, cooling means and the condition thereof of spinning head squit hole.In addition, spun multifilament is covered by known spin finish (finishing agent), the adhesion amount of this moment is counted 0.3～3 weight % (finish composition: water or low viscosity mineral oil=, with respect to silk thread, emulsion is 3～30 weight %) with respect to silk thread at 10: 90 o'clock with pure oil content.

With derivation in spinning speed 500～5000m/ minute, or temporary transient curling, or the bulk arrangement of proceeding to stretch.But, if polyblend class synthetic fiber are placed with the state that does not stretch, it is lax that orientation then takes place easily, if do not have time difference to the bulk arrangement that stretches between the package stretching, the inequality of the strength and elongation characteristic of fiber or heat shrinkability characteristic, crimp extension rate takes place easily then.Therefore, the preferred bulk finishing method of direct spinning stretching that proceeds to spinning, stretching, bulk arrangement that adopts in 1 operation.

Stretching can be carried out 1 section or 2,3 sections stretchings, during high strength more than requiring 2cN/dtex, preferably carries out the stretching more than 2 sections.Fig. 6 is the device sketch that carries out 2 sections crimping by stretching processing after the spinning continuously, in such cases, 1FR was derived with 500～5000m/ minute, 1FR is heated to about 50～100 ℃ simultaneously, between 1FR (single hot-rolling)～1DR (series connection roller), carry out the 1st section stretching, between 1DR～2DR (series connection roller), carry out the 2nd section stretching then.At this moment, making the draft temperature (the 1DR temperature of Fig. 6) when carrying out the 2nd section stretching be higher than 1FR at least more than 20 ℃, is very important for improving process stability.Therefore, when the 1FR temperature was 50～100 ℃, the 1DR temperature can be 70～130 ℃ scope, and was set at more than 1FR temperature+20 ℃.Multiplying power between the final draw roll (2DR among Fig. 6) after adjustment 1FR～stretching, making the elongation at break of the drawn yarn that obtains in final draw roll outlet sampling is 15～65%.Be preferably 20～60%.Herein, as making elongation at break is the method for above-mentioned scope, can enumerate following method: use in advance PLC (programmable controller (programmable controller)) record polymer spray volume, spinning speed, and each roller between the relation of elongation at break of the drawn yarn that obtains of stretching ratio and final draw roll outlet sampling, adjust stretching ratio automatically; Perhaps drawn yarn is taken a sample in final draw roll outlet, when the elongation at break of the drawn yarn that obtains of sampling is lower than above-mentioned scope, stretching ratio is set at lower, when elongation at break is high, stretching ratio is set at higher, thereby elongation at break is adjusted, determined that thus stretching ratio makes the elongation at break of this drawn yarn be adjusted to 15～65% scope.

By setting above-mentioned draft temperature and stretching ratio, the process stability height, and can form high strength, the little drawn yarn of evenness fault (the irregular U% of Wu Site).In addition,, carry out HEAT SETTING, can access drawn yarn with desired percent thermal shrinkage if make final draw roll temperature for being Tma-30 ℃ of benchmark～Tma+30 ℃ with the fusing point (hereinafter referred to as Tma) of aliphatic polyester resin (composition A).Be set at high temperature as described above, and in the operation of back, carry out the bulk arrangement of high temperature, can form fine striated ditch at the crimped yarn fiber surface.The result can give goods the moist high gloss of taste.Use the air flow jetting tamponade device during bulk arrangement, and be higher than the processing of curling under the temperature of 5～100 ℃ of final draw roll temperature at the nozzle temperature of this device.

Need to prove that the air flow jetting tamponade device has been carried out write up in the 1st chapter (25～39 pages) of " filament process technology handbook (last volume) " that Japanese fibre machinery association compiles.That is, this device is made the curling processing unit (plant) of BCF carpet with crimped yarn for being widely used in, and is a kind of turbulence effects of utilizing aerojet, filament is given the device of the bulkiness of irregular winding ring-type.As the example of device, in above-mentioned filament process technology handbook, put down in writing several device forms in Figure 116～130, can suitably select according to fiber number, the filamentary fiber number of formation or the degree of profile of multifilament, the rigidity of silk etc.

, in the time of reducing the crimp extension rate after the boiling water treating, this nozzle temperature can be reduced herein, in the time of improving the crimp extension rate, nozzle temperature can be improved.But, be higher than Tmb if this nozzle temperature is set at, impatient acute deterioration of working procedure processing then, so nozzle temperature on be limited to Tmb+10 ℃.Adding hot fluid and can using dry air or drying nitrogen, contain the air of steam etc. of distributing nozzle is not particularly limited, and considers from the thermal efficiency, operating cost aspect, the preferred hot-air that adds that contains steam that uses.

The strand of having given three-dimensional crimp by the air flow jetting tamponade device continues contact drum cooler, quenching, fixedly coiled structure.Then, the crimped yarn bar is applied suitable tension force, the homogeneity of improve curling, and batch with the speed of the linear velocity 10～30% that is lower than final draw roll, form package.At this moment, adjust the relaxation rate between final draw roll (2DR among Fig. 6)～coiling machine, make crimped yarn not be subjected to excess tension, and make the scope of coiling tension at 0.05～0.12cN/dtex, for the high crimped yarn of crimp extension rate, batch with relaxation rate 20～30%,, batch with relaxation rate 10～20% for the low crimped yarn of crimp extension rate.

Next, be that " the core composition is by aliphatic polyester resin (A) or aliphatic polyester resin (A) and thermoplastic polyamide resin's (B) the core-sheath-type composite fibre that polyblend constitutes, the sheath composition is made of thermoplastic polyamide resin (B) " describes to another preferred version.

To be extensive use of in order applying in the carpet purposes of high external force in interruption, and to suppress peeling off of compound interface, the core-sheath-type composite fibre must have specific fibre structure.

The inventor etc. further investigate the phenomenon of peeling off at core-sheath-type composite fibre SMIS sheath interface, found that in order to improve the anti-fissility of crimped yarn, low and core composition, sheath composition degree of crystallinity height separately by core composition, the sheath composition amorphous phase degree of orientation separately, be to have crystalline phase in core composition, each composition of sheath composition and do not have orientation amorphous phase two phase structures, can significantly improve anti-fissility.At first, the easy reason that reduces of the anti-fissility of crimped yarn is studied, be found that with the core composition of core sheath interface adjacency and the molecularly oriented of sheath composition and compare, uprise easily with the zone beyond the interface.Because with the molecularly oriented height of each composition of core sheath interface adjacency, there is residual stress easily in core sheath interface, if the external force of applying, then because this external force, stress is released, and interface peel extends simultaneously.

At being higher than other regional reasons with the core composition of the core sheath interface adjacency of core-sheath-type composite fibre and the molecularly oriented of sheath composition, also do not determine, but infer it is owing in the processing of curling, when core, each composition thermal contraction of sheath, core sheath interface has been applied excessive deformation.That is to say, the thermal contraction of fiber causes by core composition, the sheath composition amorphous phase molecularly oriented in separately is lax, at this moment, under the situation of the core-sheath-type composite fibre that the composition that is differed from one another by core composition and sheath composition forms, the heat shrinkability characteristic of two compositions has difference.For each composition, because the existence of this heat shrinkability characteristic difference, the thermal contraction of itself is suppressed by other compositions or promotes.When supposition is transmitted thermal contraction between two kinds of compositions, be subjected to excessive deformation with the core composition of core sheath interface adjacency and the strand of sheath composition, molecularly oriented can not be fully lax as a result, causes orientation to remain in unsure state.The strand utilization of above-mentioned unstable state of orientation can make the lax molecular motion of orientation, produces residual stress at core sheath interface.And if the external force of applying, then owing to this external force, stress is released, and interface peel extends simultaneously.

In crimped yarns such as false twist yarn or machine crimp elastic filament, the core composition of above-mentioned and core sheath interface adjacency and the molecularly oriented of sheath composition uprise easily, produce residual stress at core sheath interface, and peel off easily at the interface sometimes.On the other hand, find when using multifilament that the core-sheath-type composite fibre forms as the BCF silk, different with above-mentioned other processing, suppress the generation of core sheath interface residual stress significantly, obtain being difficult to cause the internal structure of interface peel easily.Its reason is also indeterminate, but infer in the curling processing that utilizes the filling of air flow jetting method, utilization adds the turbulence effects of hot fluid, each filamentary core composition and sheath composition can be heated at short notice equably near the fusing point (Tmb) of thermoplastic polyamide resin (B), make its thermal contraction under tension-free state simultaneously, and use the chill roll quenching immediately, can make thus with the zone of core sheath interface adjacency in the amorphous phase molecularly oriented fully lax, thereby be difficult to the residual experience that causes by the heat shrinkability characteristic difference of each composition.

When senior manufacturing procedure such as dyeing or goods use through the time change, also accumulating residual stress with the unsettled molecular chain orientation of state of orientation of the core composition of core sheath interface adjacency, sheath composition when lax at core sheath interface.Particularly use aliphatic polyester (A) as the core composition, be exposed to when pining for and since through the time to change the amorphous phase molecularly oriented easier to be lax.Therefore, be easy to generate residual stress at core sheath interface, peel off easily at the interface.That is, the core composition of crimped yarn, sheath composition amorphous phase molecularly oriented separately is low more, and anti-fissility is good more, so preferred.And the crystalline phase that exists in core composition, the sheath composition is many more, and then the relaxation exercise of amorphous phase strand is limited more, and is so anti-fissility becomes good, comparatively desirable.

The fibre structure of crimped yarn and the rerum natura of crimped yarn are closely related, the crimped yarn that constitutes by the core-sheath-type composite fibre of the present invention be by be set at specific intensity, the receipts of boiling (boiling water shrinkage), filament fiber number obtain.

The high more tendency of intensity that has the high more crimped yarn of the amorphous phase degree of orientation of fibrous inside.If the common crimped yarn that constitutes by single component, durability aspect during then from working procedure processing and goods use is considered, preferred intensity is high more good more, but the crimped yarn that use core-sheath-type composite fibre of the present invention forms is because the low more anti-fissility of the amorphous phase degree of orientation is good more, so preferred intensity is below the 3cN/dtex.By the intensity that makes crimped yarn of the present invention is below the 3cN/dtex, makes the amorphous phase degree of orientation of fibrous inside enough low, is difficult to produce residual stress at core sheath interface, forms the good crimped yarn of anti-fissility, so preferred.Consider that from the aspect that obtains the better crimped yarn of anti-fissility preferred intensity is below the 2.8cN/dtex, more preferably is below the 2.6cN/dtex, more preferably below the 2.4cN/dtex.And if intensity is low excessively, the poor durability of spinnability, senior manufacturing procedure processability or goods sometimes then.Therefore, intensity is necessary for more than the 1.5cN/dtex, be preferably more than the 1.7cN/dtex, and more preferably be more than the 1.9cN/dtex, more preferably more than the 2.1cN/dtex.Need to prove, can utilize the method shown in the embodiment to measure intensity.

By boiling water treating, the amorphous phase molecularly oriented is relaxed filament contraction.And the crystalline phase that is present in this moment in the fiber plays a role as the constraint point, suppresses the lax of amorphous phase.That is to say that the amorphous phase degree of orientation of crimped yarn fibrous inside is low more, degree of crystallinity is high more, then boiling water shrinkage (hereinafter referred to as " receipts of boiling ") is low more.That is, because the receipts of boiling are low more, the amorphous phase degree of orientation of fibrous inside is low, and the degree of crystallinity height, so crimped yarn of the present invention is difficult to produce residual stress at core sheath interface, anti-fissility is good, and is comparatively rational.

Can utilize the method shown in the embodiment to measure the receipts of boiling,, can calculate the receipts of boiling by under free state, measuring the length variations of crimped yarn silk before and after boiling water treating.Crimped yarn of the present invention preferably boils, and to receive be below 6%.Consider that from the viewpoint that forms the better crimped yarn of anti-fissility the receipts of preferably boiling are below 5%, more preferably below 4%, are preferably below 3% especially.Boil to receive and lowly more unreasonablely think, most preferably be 0～2%.The desirable receipts of boiling can be 0%.

The preferred filament fiber number of core-sheath-type composite fibre of the present invention is 5～40dtex.By making the filament fiber number is below the 40dtex, can in the manufacturing procedure of curling, add thermal fiber rapidly, and make in the filamentary cross section and be heated equably, so, be difficult to be subjected to excessive deformation with the core composition of core sheath interface adjacency, the strand of sheath composition, thereby core sheath interface is difficult to produce residual stress.That is, anti-fissility is good.Simultaneously owing to cause crystallization easily, so fibre structure be fixed, even behind the dyeing process or through the time change after, also can the anti-fissility of long term maintenance, so preferably.From form the amorphous phase molecularly oriented low and degree of crystallinity is high, be that the good crimped yarn aspect of anti-fissility is considered, the filament fiber number is thin more unreasonablely to be thought, preferred fiber number is below the 38dtex, more preferably is below the 35dtex, more preferably below the 33dtex, be preferably below the 30dtex especially.But, if the filament fiber number is meticulous, form crystalline phase and irregular amorphous phase two phase structures when handling easily though curl, but because the tensile stress that in the operation that the expansion of back is curled, applies, batch crimped yarn operation in the coiling tension that applies or the tension force that in senior manufacturing procedure, applies, crimped yarn is stretched once more, thereby is easy to generate excessive deformation at core sheath interface.Therefore, the filament fiber number is preferably more than the 5dtex.More preferably be more than the 6dtex, more preferably more than the 8dtex.Among the present invention, as mentioned above, by making intensity is that 1.5～3cN/dtex, filament fiber number are 5～40dtex, the receipts of boiling are below 6%, can solve the problem of inevitably peeling off that exists in the crimped yarn that is made of the core-sheath-type composite fibre first, the core composition of described core-sheath-type composite fibre is made of thermoplastic polyamide resin (B) aliphatic polyester resin (A) formation, sheath composition.

The core composition of core-sheath-type composite fibre of the present invention is become by aliphatic polyester resin (A) (below be also referred to as " composition A ") or aliphatic polyester resin (A) and thermoplastic polyamide resin's (B) (below be also referred to as " composition B ") polyblend hook.Preferred above-mentioned binary constitutes more than the 90 weight % of core composition among the present invention, more preferably is more than the 93 weight %, more preferably more than the 95 weight %.

In core-sheath-type composite fibre of the present invention, by making the polyblend that forms aliphatic polyester resin (A) and thermoplastic polyamide resin (B) in the core composition, can enter so-called island or the extra large structure that obtains mutually by composition A and composition B, peeling off of the core sheath interface of inhibition sheath composition and core composition, and it is form the sufficiently high fiber of ABRASION RESISTANCE, so preferred.In addition, the composition B that uses in the composition B that uses in the core composition and the sheath composition can be identical, also can be different.Even the content of the composition A of core-sheath-type composite fibre is more than the 20 weight %, also can obtain ABRASION RESISTANCE, fiber that heat resistance is high.

Herein, the thermoplastic polyamide resin (B) of formation core composition is preferably formed the sea.In addition, for the ratio of the aliphatic polyester resin in the polyblend that improves the core composition (A), it is very important that the melt viscosity of the aliphatic polyester when making melt spinning (A) is higher than polyamide thermoplastic (B).

Constitute the composition A of core composition of core-sheath-type composite fibre of the present invention and the blending ratio (weight ratio) of composition B and be preferably composition A/ composition B=95/5～20/80.Contain composition B in the core composition by making, in a part of core sheath interface, have composition B at least, can improve the cementability at core sheath interface, suppress interface peel, so preferred.Under the situation of core-sheath-type composite fibre, if then easy fibrillation is peeled off at core sheath interface.Fibrillation Once you begin, the rate of wear of fiber is sharply accelerated.Therefore, in order to improve the ABRASION RESISTANCE of fiber, it is very important that core sheath interface is not peeled off.The composition B that contains in the core composition is many more, preferred mixed with polymers body structure described later of easy more formation the present invention (a) or structure (c), and so the high abrasion resistance of fiber is preferred.Therefore, the blending ratio height of the composition B in the preferred core composition.But,,, promptly preferably reduce the ratio of composition B so preferably contain a large amount of composition A that derives from plant as far as possible because core-sheath-type composite fibre of the present invention is the material that has the performance that reduces carrying capacity of environment concurrently.In order to satisfy following two aspects, the cementability that promptly improves core sheath interface makes high abrasion resistance, and is the low material of a kind of carrying capacity of environment, and more preferably composition A/ composition B is 80/20～25/75, more preferably 70/30～30/70, be preferably 60/40～35/65 especially.

Composition A that the blending ratio (weight ratio) of composition A/ composition B can be when being supplied in melt spinning in the core composition of the present invention and the weight rate of composition B calculate.But under the not clear situation of the blending ratio (weight ratio) of composition A and composition B, can simplify calculating during fabrication with following formula.Promptly, the core composition of core-sheath-type composite fibre of the present invention comprises composition A, composition B and other minor constituents sometimes, even in this case, also can be considered as the core composition and in fact only constitute, thereby calculate the blending ratio (weight ratio) of composition A/ composition B by composition A and composition B binary.At first, utilize transmission electron microscope (TEM) to observe core-sheath-type composite fibre cross-sectional slices, obtain the gross area (Aa) of the composition A that constitutes the core composition and the gross area (Ab) of composition B with 40,000 times.The proportion of composition A is 1.26, the proportion of composition B is 1.14, utilizes following formula to calculate.

Composition A/ composition B=(Aa * 1.26)/(Ab * 1.14).

In addition, when being difficult to judge the boundary line of cross section mesotheca composition and core composition, in cross section,, judge sheath composition and core composition with to circumscribed to be present in the similar figure of outermost composition A and the only inner fiber cross section that contains composition A be the boundary line.

As the mixed with polymers body structure in the filament cross section of core composition, can enumerate following (a)～(c), in any one mixed with polymers body structure, all utilize the repercussion effect between the composition B of composition B in the core composition and sheath composition, show good ABRASION RESISTANCE.But form the extremely viewpoint of fiber with excellent of continuous phase, ABRASION RESISTANCE from the composition B that forms the core composition and the composition B of sheath composition, wherein the mixed with polymers body structure of preferred core composition is (a) or (c), is preferably (a) especially.

(a) composition A is that island component, composition B are sea component (island structure)

(b) composition B is that island component, composition A are sea component (island structure)

(c) composition A and composition B are sea component (extra large structure).

Utilize preferred mixed with polymers body structure (a) i.e. that the TEM photo explanation of Fig. 1 constitutes core composition of the present invention " composition A is that island component, composition B are the island structure of sea component " herein.The composition that is colored among Fig. 1 is represented thermoplastic polyamide resin (B), and the composition that is not colored is represented aliphatic polyester resin (A).As shown in Figure 1, by the composition B for the continuum composition A being separated into a plurality of slightly circular regions, is that island component, composition B are the island structure of sea component with this organization definition for (a) composition A.Need to prove that exist with island component (being slightly circular) at the internal component B as the composition A of island component, lake, promptly so-called island structure is also included within the island structure of the present invention.Mixed with polymers body structure (b) i.e. " composition A is that sea component, composition B are the island structure of island component " is by the composition A for the continuum composition B to be divided into a plurality of slightly structures of border circular areas.In addition, with mixed with polymers body structure of the present invention (c) promptly " composition A, composition B are the extra large structure of sea component " be defined as composition A, composition B and be not slightly circular, can't judge the structure of island component and sea component.

The melt viscosity of the blending ratio (weight ratio) of the mixed with polymers body structure of core composition and mentioned component A and composition B, composition A described later (η a) and the ratio of viscosities of the melt viscosity (η b) of composition B closely related, by making it, can control the mixture structure of core composition respectively in suitable scope.

In order to form the i.e. structure of (a) of particularly preferred mixed with polymers body structure, preferably increase the melt viscosity η a of composition A, reduce the melt viscosity η b of composition B.This is because the balance influence mixed with polymers body structure of the melt viscosity of composition A and composition B.The mixed with polymers body structure forms when being endowed detrusion under molten condition, but the shear stress that forms detrusion easily and produced is reduced to minimum structure.This is because the whole energy level of silk reduces, and is in stable state.This means that the composition that directly is applied in shearing with the easy formation of the low composition of melt viscosity is a sea component, the opposite high composition of melt viscosity forms island component easily.That is, in the present invention, in order to form particularly preferred mixed with polymers body structure (a), the ratio of melt viscosity (η b/ η is a) little comparatively desirable, is preferably below 2, and more preferably be below 1.5, more preferably below 1.If but the ratio of melt viscosity is too small, then there is the tendency of thickization of diameter of island component, so (η b/ η is more than 0.10 a) to the ratio of preferred molten viscosity, more preferably is more than 0.15, more preferably more than 0.20.Need to prove that the assay method of melt viscosity η is described in detail later, be illustrated in and measure 240 ℃ of temperature, shear rate 1216sec ^-1Melt viscosity when measuring down.

When the core composition of core-sheath-type composite fibre of the present invention presented island structure, the diameter of preferred island component was 0.001 μ m～2 μ m.By make the island component diameter on be limited to 2 μ m, the area at the interface that is formed by composition A and composition B increases tremendously, and then the ABRASION RESISTANCE of fiber improves tremendously, so preferred.And if the diameter of island component is too small, then composition A and composition B mix at molecular level, hinder crystallinity sometimes, and the ABRASION RESISTANCE of fiber, heat resistance, dyeing firmness descend simultaneously.Consider that from this point the diameter lower limit of island component is preferably more than 0.001.As known from the above, the diameter of island component is preferably 0.005 μ m～1 μ m, more preferably is 0.01 μ m～0.8 μ m.0.02 μ m～0.5 μ m more preferably.

Need to prove, as described in detail among the embodiment, the diameter of so-called island component utilizes the cross-sectional slices that transmission electron microscope (TEM) (40,000 times) is observed this core-sheath-type composite fibre among the present invention, 100 islands of per 1 core-sheath-type composite fibre sample are measured the diameter (suppose the island for circular, the diameter that will be obtained by the area conversion on island is as the diameter of island component) of island component.Be distributed in above-mentioned scope by the diameter that makes this island component, can improve ABRASION RESISTANCE, heat resistance, the dyeing firmness of fiber.

Because constituting the material of the core composition of core-sheath-type composite fibre of the present invention is polyblend, different with the block copolymer that aliphatic polyester block and polyamide-block in 1 strand alternately exist, the independent in fact existence of aliphatic polyester strand (composition A) and polyamide strand (composition B) is very important.The difference of this state can descend by the fusing point of the thermoplastic polyamide resin before and after observe cooperating, the fusing point that promptly comes from the thermoplastic polyamide resin in the polyblend with cooperate before thermoplastic polyamide resin's fusing point compare what kind of degree that descends and inferred.If it is below 3 ℃ that thermoplastic polyamide resin's fusing point descends, then go up substantially copolymerization (not causing the ester-acid amide exchange basically), the state of aliphatic polyester strand and the self-existent in fact polyblend of polyamide strand do not take place for aliphatic polyester and polyamide.

By composition A and composition B are in fact independently existed, forming the thermoplastic polyamide resin (B) of sheath composition and the thermoplastic polyamide resin (B) of formation core composition interacts easily, improve the cementability at the interface of sheath composition and core composition, so preferred.The intrinsic characteristic of thermoplastic polyamide resin (B) as the sheath composition is reflected in the fiber properties thus, thereby ABRASION RESISTANCE is improved tremendously.So among the present invention, the fusing point of polyamide thermoplastic (B) descends and is preferably below 2 ℃.In addition, consider that the thermoplastic polyamide resin (B) who is preferred for the thermoplastic polyamide resin (B) of core composition and is used for the sheath composition is to be the polyamide of main repetitive with monomer of the same race from the viewpoint of the cementability at the interface of improving sheath composition and core composition.For example, nylon 6 and based on the combination of the copolyamide of nylon 6 or the combination of nylon 6 and NYLON610.Equally, the fusing point of this binary is approaching more, can select the spinning temperature that is difficult to cause the hot deterioration of each polymer when melt spinning more, and so the high abrasion resistance of the fiber that obtains is preferred.Therefore, the thermoplastic polyamide resin's that preferred core composition and sheath composition use separately fusing point difference is below 30 ℃, more preferably is below 20 ℃, more preferably below 10 ℃.

Island component in the polyblend of core composition preferably upwards is the striated elongated state at fiber axis respectively.By making island component is striated, can increase the area of the bonding compound interface of an island component and sea component, and then can suppress fibrillation, so preferred.By making island component form elongated striped, also has the advantage that intensity uprises.When island component is striated, most preferably be parallel to the fiber axis direction fully, the striation that relative fiber axis is tilted below 5 ° is defined as the striated elongated state that fiber axis makes progress in the present invention.

The content of composition A (composition A is with respect to the weight % of total weight of fiber) is high more in the core-sheath-type composite fibre of the present invention, can form the low material of carrying capacity of environment more, so the content height of composition A is comparatively desirable.The content of composition A is preferably more than the 20 weight %, more preferably is more than the 30 weight %, more preferably more than the 40 weight %.And consider that from anti-fissility, ABRASION RESISTANCE, the curling good aspect of firmness the content of preferred component A is below the 80 weight %, more preferably is below the 75 weight %, more preferably below the 70 weight %.The content of composition A (composition A is with respect to the weight % of total weight of fiber) can calculate according to the method for putting down in writing among the embodiment.Promptly, will be from crimped yarn only the difference of the weight of the fibre weight behind the stripping composition A and original crimped yarn be considered as the weight of composition A, calculate the content of composition A by the difference of removing this weight with original crimped yarn weight, described crimped yarn is made of the core-sheath-type composite fibre.

Under the situation of core-sheath-type composite fibre, the sheath composition must be made of thermoplastic polyamide resin (B).By having polyamide thermoplastic (B) as the sheath composition, can make the area that exposes of aliphatic polyester resin (A) be essentially 0 with respect to the ratio of fiber surface area, so ABRASION RESISTANCE improve tremendously, so preferred.Need to prove,, can access the material of ABRASION RESISTANCE, excellent heat resistance, so more than the 90 weight % of preferred component B formation sheath composition, more preferably more than the 93 weight %, further more than the preferred 95 weight % by in the sheath composition, containing more substantial composition B.

As mentioned above, thermoplastic polyamide resin (B) can be a copolymer, but the crystalline phase that core-sheath-type composite fibre of the present invention contains is many more, even can suppress more when using by senior manufacturing procedure or goods through the time change and wait the amorphous phase orientation that causes to relax, and then be difficult in core sheath interface generation residual stress, and then anti-fissility is good, so preferred.Therefore, thermoplastic polyamide resin (B) crystallinity is high more unreasonablely to be thought, so preferred watery fusion peak heat Δ H is more than the 10J/g, more preferably is more than the 20J/g, more preferably more than the 30J/g.

Aliphatic polyester resin of the present invention (A) and thermoplastic polyamide resin (B) do not react basically, so, in order to improve the cementability at the core sheath interface that forms by above-mentioned two polymer, preferably add above-mentioned phase solvation (composition C).Particularly, add among composition A and/or the composition B by the compound that will have two above reactive with active hydrogen groups in a part, melting mixing is carried out spinning, because any one composition reaction among this compound and composition A and the composition B forms cross-linked structure, so can suppress the phenomenon of peeling off at core sheath interface, more preferably.

In addition, the fusing point of composition B and composition C is approaching more, can select the spinning temperature that each polymer is difficult to cause hot deterioration when melt spinning more, and so the high abrasion resistance of the fiber that obtains is preferred.Therefore, the difference of the fusing point of preferred component B and composition C is below 30 ℃, more preferably is below 20 ℃, more preferably below 10 ℃.

Content dispersed or reactive, composition A the when addition of composition C can be according to the equivalent of the reactive group per unit weight of compound used therefor, fusion is suitably determined, but consider that from the aspect of peeling off that suppresses core sheath interface preferably the total amount with respect to composition A, composition B and composition C is more than the 0.005 weight %.More preferably be more than the 0.02 weight %, more preferably more than the 0.1 weight %.If the addition of composition C is very few, then the reacting dose in the core sheath interface is few, and the effect that improves the cementability at core sheath interface is restricted sometimes.On the other hand, bring into play performance in order to make composition C under the prerequisite that does not influence as the characteristic of the composition A of fiber base material and composition B and spinnability, the addition of preferred component C is below the 5 weight %, more preferably is below the 3 weight %.More preferably below the 1 weight %.

In order to promote above-mentioned reaction with compound of reactive group, be the catalyst of alkali metal, alkaline-earth metal if add slaine, the particularly metal of carboxylic acid, then can improve reaction efficiency, so preferred.Wherein, preferably use the catalyst based on lactic acid such as sodium lactate, calcium lactate, magnesium lactate.In addition, in order to prevent to descend, can also use separately or and with the bigger catalyst of Metallic stearates equimolecular quantity by the heat resistance of adding the resin that catalyst causes.Need to prove that from controlling dispersiveness, the consideration of reactive aspect, the addition of this catalyst is 5～2000ppm with respect to synthetic fiber preferably.More preferably be 10～1000ppm, further preferred 20～500ppm.

Core-sheath-type composite fibre of the present invention preferred core sheath ratio (weight ratio) is 10/90～65/35.But the ratio of core composition is high more, the area at core sheath interface is big more, if the ratio height of core composition, then since cause containing mass crystallization low and cause easily through the time composition A that changes, so exist core sheath interface to be easy to generate residual stress, the tendency that anti-fissility worsens.Therefore, in order to improve anti-fissility, the core sheath interfacial area of preferred per unit volume core composition is big, considers from this viewpoint, and the ratio of core composition is low comparatively desirable.The ratio that increases the sheath composition also has the advantage that improves the firmness that curls.Therefore, core sheath ratio is preferably above-mentioned scope, and more preferably 10/90～50/50, more preferably 10/90～45/55.

The core composition that can be by will be supplied in melt spinning time the and the weight sum of sheath composition be as 100, and calculate core composition, sheath composition respectively with respect to the ratio of this weight sum, and then calculate the core sheath ratio among the present invention.But, during manufacturing under the unclear situation of weight rate of core composition and sheath composition, also can utilize following formula to simplify to calculate and obtain.Promptly, the core composition of core-sheath-type composite fibre of the present invention contains composition A and other minor constituents sometimes, the sheath composition contains composition B and other minor constituents sometimes, even in this case, also the core composition can be considered as in fact only constitute by composition A, the sheath composition in fact only is made of composition B, and the weight ratio of calculating knockout composition and sheath composition is as core sheath ratio.At first, utilize transmission electron microscope (TEM), obtain the gross area (Ab) in the zone of the gross area (Aa) in the zone that constitutes the core composition and formation sheath composition with 4,000 times of cross-sectional slices of observing crimped yarns.The proportion of composition A is 1.26, the proportion of composition B is 1.14, utilizes following formula to calculate core sheath ratio.

The weight rate of the weight rate/sheath composition of core sheath ratio=core composition

The weight rate of core composition=[(Aa * 1.26)/(Aa * 1.26+Ab * 1.14)] * 100

The weight rate of sheath composition=[(Ab * 1.14)/(Aa * 1.26+Ab * 1.14)] * 100.

The shape of cross section of core-sheath-type composite fibre of the present invention can be various cross sectional shapes such as circle, Y shape, leafy shape, polygon, pancake, hollow shape.Under the situation for multifilament, each filamentary cross sectional shape can be identical, also can be different.One of form of the filamentary shape of cross section of core-sheath-type composite fibre of the present invention as shown in figure 10.Among Figure 10,42 expression composition A, 43 expression composition B.Circle, Y shape, the various forms of leafy shape shown in Figure 10.The shape of cross section of core-sheath-type composite fibre of the present invention specifically is preferably Y shape, leafy shape, pancake, more preferably Y shape or pancake.

The preferred filamentary degree of profile of core-sheath-type composite fibre of the present invention (D3/D4) is 1.3～4.Because filamentary degree of profile is high more, the surface area of fiber is big more, so fiber is heated rapidly in the manufacturing procedure of curling, evenly heated in the cross section of fiber, be not vulnerable to excessive deformation thus with in the strand of the core composition of core sheath interface adjacency, sheath composition, and then it is obtain the good crimped yarn of anti-fissility, so preferred.Therefore, filamentary degree of profile is preferably more than 1.3, more preferably is more than 1.5, more preferably more than 1.8, is preferably more than 2.0 especially.If but degree of profile is too high, then cross sectional shape becomes easily and has acute angle part, and external force concentrates on this acute angle part, and ABRASION RESISTANCE worsens sometimes.In addition, also existence is difficult to the problem of sheath composition in the manufacturing process of the core composition that evenly is covered on the long axis direction.Consider that from the aspect that suppresses the problems referred to above preferred degree of profile is below 4, more preferably is below 3.8, more preferably below 3.5, is preferably below 3.3 especially.

Filamentary degree of profile is defined as follows: use TEM to observe filamentary cross section according to the method for embodiment, the circumscribed diameter D3 of cross section and the ratio (D3/D4) of inscribe diameter of a circle D4 are degree of profile.When odd-shaped cross section was judged as roughly retention wire symmetry, point-symmetry property, so-called inscribed circle was the circle that is inscribed within contour curve in the filament cross section, and so-called circumcircle is the circle that is cut in contour curve at filamentary cross section at home and abroad.When odd-shaped cross section is judged as fully not the shape of retention wire symmetry, point-symmetry property, with following circle is inscribed circle: at least on 2 o'clock with filamentary contour curve inscribe, only be present in the inside of fiber, and have available maximum radius in the circumference of inscribed circle and the Uncrossed scope of filamentary contour curve.So-called circumcircle is meant following circle: circumscribed with filamentary contour curve on 2 o'clock at least, and only be present in the outside of filamentary cross section, and have available minimum diameter in circumscribed circumference and the Uncrossed scope of filamentary profile.When calculating degree of profile, cut the cross section that obtains from different places to 10 and calculate degree of profile, it is on average tried to achieve.

The degree of profile (D1/D2) of the preferred core composition of core-sheath-type composite fibre of the present invention is 1.3～4.The degree of profile of core composition is high more, and the area at the core sheath interface of per unit volume core composition is big more, and anti-fissility is good, so preferred.Therefore, the degree of profile of core composition is preferably more than 1.3, more preferably is more than 1.5, more preferably more than 1.8, is preferably more than 2 especially.And if the degree of profile of core composition is excessive, then in filamentary cross section, be difficult to make the evenly lining on long axis direction of sheath composition sometimes, cause anti-fissility to worsen.Therefore, the degree of profile of core composition is preferably below 4, more preferably is below 3.8, more preferably below 3.5, is preferably below 3.3 especially.Need to prove that the degree of profile of core composition of the present invention is identical with above-mentioned filamentary degree of profile, core sheath compound interface is used as cross sectional shape measures.

The cross sectional shape of preferred crimped yarn as shown in figure 10 among the present invention.The shape of cross section that constitutes the filamentary core composition of crimped yarn is an arbitrary shape, even consider that from the ratio of the core composition of the cementability that improves core sheath interface, crimped yarn and then the also good viewpoint of the how anti-fissility of content of composition A the cross sectional shape of core composition is preferably and filamentary cross sectional shape similar shapes.So-called herein similar shape is not meant strict similar shapes on the mathematics, and is meant that for example filamentary cross sectional shape is a Y shape that the cross sectional shape of core composition is a Y shape, even under the different situation of both degree of profiles, also can be considered similar shape.Certainly, core-sheath-type composite fibre of the present invention is not limited to the cross sectional shape of Figure 10.Need to prove that the quantity of the core composition of core-sheath-type composite fibre of the present invention is individual arbitrarily, filamentary inside can have 1 core composition, also can have a plurality of core compositions.The center of gravity of the center of gravity of the shape that the filament cross-sectional profiles forms and the shape of core composition profile formation can be identical, also can be different, because the even more lining sheath of fiber surface composition, ABRASION RESISTANCE is good more, so the center of gravity of the shape that preferred filamentary profile forms is identical with the center of gravity of the shape of the profile formation of core composition.Under the situation of multifilament, in each filamentary cross section, the shape that the profile of core composition forms can be identical, also can be different.

Core-sheath-type composite fibre of the present invention is the core-sheath-type composite fibre that so-called island composite fibre forms if there are a plurality of core compositions in use in filamentary cross section, then the area at the core sheath interface of per unit volume core composition increases, anti-fissility becomes well, so preferred.Therefore, preferred core composition is more than 3 islands, more preferably is more than 9 islands, more preferably more than 24 islands.

Consider from the fiber aspect that forms high abrasion resistance, core-sheath-type composite fibre of the present invention preferably on the fiber long axis direction fiber surface integral body constitute by the sheath composition in fact, special preferred component A does not expose at fiber surface.The anti-fissility of core-sheath-type composite fibre of the present invention is good, and fiber surface is covered by the sheath composition in fact, improves ABRASION RESISTANCE thus tremendously.In order to improve ABRASION RESISTANCE, anti-fissility, preferred sheath composition is thicker in the entire cross section of fiber, and the minimum of a value of sheath composition thickness is preferably more than the 0.4 μ m.More preferably be more than the 0.7 μ m, more preferably more than the 1 μ m.In addition, in spinning process, when using polyblend, also there is the advantage on the manufacture method that suppresses Barus effect, raising working procedure processing as the core composition.On the other hand, if sheath thickness is big, then aliphatic polyester resin (A) tails off with respect to the ratio of total weight of fiber, causes breaking away from the purpose of the material that the carrying capacity of environment reduction is provided sometimes.The thickness of therefore preferred sheath composition is below the 10 μ m, more preferably is below the 7 μ m, more preferably below the 5 μ m.Need to prove that the minimum of a value for the thickness that increases the sheath composition preferably makes core sheath ratio, filament number, filamentary degree of profile in above-mentioned scope, and the melt viscosity of preferred component A and composition B than, spinning temperature in the aftermentioned scope.

The high more crystalline phase that promptly contains of core-sheath-type composite fibre degree of crystallinity of the present invention is many more, the amorphous phase orientation relaxation exercise of easy more inhibition core composition, sheath composition, and then form the good crimped yarn of anti-fissility, so preferred.And degree of crystallinity is high more, and ABRASION RESISTANCE, heat resistance, dyeing and curling fastness etc. are good more, so preferred.Degree of crystallinity of the present invention can be by the differential calorimetric curves measured with 16 ℃/minute of programming rates the thermal capacity summation of melting hump estimate, the thermal capacity summation of this melting hump is preferably more than the 50J/g, more preferably be more than the 60J/g, more preferably more than the 70J/g.In order to have above-mentioned melting hump, preferably use the high polymer of crystallinity as composition A, composition B.As described later, in order to promote the crystallization of each composition, preferably adjust stretching ratio, the heat treatment temperature after stretching and the curling nozzle temperature in the manufacturing procedure of curling etc. create conditions.

Good more from the bulkiness of crimped yarn, the good more viewpoint of product property considers that the bulkiness index of the preferred crimped yarn of core-sheath-type composite fibre of the present invention is the crimp extension rate height after the boiling water treating.Therefore, the crimp extension rate after the boiling water treating is preferably more than 5%, more preferably is more than 10%, to be preferably more than 15% especially.The upper limit of the crimp extension rate after the boiling water treating is not particularly limited, if too high, then filament has bend easily, and anti-fissility is worsened.From this point, the percentage elongation after the boiling water treating is preferably below 35%, more preferably is below 33%, to be preferably below 30% especially.

Core-sheath-type composite fibre of the present invention preferably is difficult to launch to curl (the firmness height curls) in dyeing process, senior manufacturing procedure or in the long-term use after making fiber construct, and the sense of fullness of energy long term maintenance goods.Therefore, curl the firmness index promptly the crimp extension rate after carrying out boiling water treating under the 2mg/dtex load (following will abbreviate " percentage elongation under the restriction load " in the crimp extension rate after the boiling water treating under the 2mg/dtex load as sometimes) be preferably more than 2%.More preferably be more than 3%, more preferably more than 5%, to be preferably more than 7% especially.The upper limit is not particularly limited, but adds and cause tension man-hour, dysgenic viewpoint such as dyeing gradation unequal takes place at the end face of package consider, be preferably below 30% from suppressing for example to carry out cone dyeing.Restriction load percentage elongation down can utilize the method shown in the embodiment to measure.

In addition, if the degree of stretching of core-sheath-type composite fibre of the present invention is 15～70%, the working procedure processing when then making fibre is good, so preferred.Crimped yarn with above-mentioned degree of stretching can be that preferable range manufacturing obtains by make stretching ratio in manufacture method described later.Degree of stretching more preferably is 20～60%, more preferably 30～50%.

The preferred evenness fault of core-sheath-type composite fibre of the present invention is little.By reducing evenness fault, external force concentrates on the part in the time of can suppressing to be worn, thereby improves anti-fissility, so preferred.Therefore, being preferably below 2.5% as the evenness fault (Wu Site U%) (normal state) of the index of evenness fault, more preferably is below 2.0%, more preferably below 1.5, is preferably below 1.0 especially.Compare with the simple aggregation thing mixture fiber of existing aliphatic polyester and polyamide, core-sheath-type composite fibre of the present invention can suppress Barus effect owing to have the sheath composition at fiber surface so also have, and stablizes detailed performance, reduce evenness fault, the advantage of high abrasion resistance.In order to reduce evenness fault, can be by selected melt viscosity than composition A and composition B in preferable range of the present invention, make the detailed performance of spinning threadling stable, perhaps by carrying out melt spinning, stretching in 1 stage continuously, curling and handle, make undrawn yarn do not take place through the time directly stretch with changing, curl and handle, thereby reduce evenness fault.

Manufacture method as the crimped yarn that is made of the core-sheath-type composite fibre of one of preferred version of the present invention is not particularly limited, and for example can utilize the direct spinning stretching shown in Figure 9 processing unit (plant) that curls, and adopts following method to make.

As used thermoplastic polyamide resin (B), by improving its melt viscosity (η b), can the heat treatment after stretching reach in the manufacturing procedure of curling, near the fusing point (Tmb) of under the situation that does not cause the heat bonding between the filament temperature of fiber being brought up to thermoplastic polyamide resin (B).Make the middle amorphous phase strand of thermoplastic polyamide resin (B) carry out two polarization thus, promptly become the crystallization strand and relax, carry out the strand of irregular configuration, thereby make anti-fissility good, so preferred with orientation.And from suppress core sheath complex anomaly spinning process, the viewpoint that makes the sheath composition evenly cover fiber cross section, fiber long axis direction considers that thermoplastic polyamide resin's (B) melt viscosity (η b) preferably is controlled at suitable height.Therefore, thermoplastic polyamide resin's (B) melt viscosity (η b) is preferably 10～300Pasec ^-1, more preferably be 20～250Pasec ^-1, 30～200Pasec more preferably ^-1

Under the situation of aliphatic polyester resin (A) and thermoplastic polyamide resin's (B) simple core-sheath-type composite fibre, by in the melt spinning operation, making core composition and sheath composition evenly carry out molecularly oriented, even in the stretching process of back, also can evenly stretch each composition, curl add man-hour the core composition and the heat shrinkability characteristic of sheath composition be difficult to produce difference, thereby make the strand with core sheath interface adjacency be difficult to be subjected to excessive deformation, improve anti-fissility.The molecularly oriented of core composition, sheath composition is subjected to be applied in the elongation strain Stress Control on each composition, so, the melt viscosity of aliphatic polyester resin (A) (η a) and thermoplastic polyamide resin's (B) melt viscosity (η b) near comparatively desirable, the ratio of the melt viscosity of composition A and composition B is that melt viscosity is than (η b/ η a) is preferably 0.2～2.More preferably be 0.4～1.7, more preferably 0.6～1.4.

Herein, melt viscosity η a, the η b among the present invention is used for the polymer of crimped yarn at 240 ℃ of temperature, shear rate 1216sec ^-1Melt viscosity (Pasec), can utilize the method for putting down in writing among the embodiment to measure.In addition, can not obtain being used under the situation of composition A, composition B of crimped yarn, the relative viscosity (η rb) of composition B is simplified and is obtained η a, η b in relative viscosity (η ra) that can be by measuring composition A in the crimped yarn, the crimped yarn.As shown in figure 11, there are the relation shown in the following formula respectively in η ra and η a, η rb and η b.

The solution viscosity of composition A and the relation of melt viscosity

log(ηa)＝4.3049×log(ηra)

The solution viscosity of composition B and the relation of melt viscosity

log(ηb)＝5.2705×log(ηrb)。

Herein, relative viscosity can adopt the method shown in the embodiment to measure.Promptly, use Ostwald (Ostwald) viscosimeter, under particular concentration, temperature, time conditions, composition A is dissolved in o-chlorphenol solution, composition B is dissolved in sulfuric acid solution, make solution respectively, utilize the above-mentioned solution and the Drain time ratio of the solvent that can not dissolve each composition to represent relative viscosity, relative viscosity is the index of expression solution viscosity.

In addition, use under the situation of the polyblend that has mixed aliphatic polyester (A) and thermoplastic polyamide resin (B) in the core composition, measure each polymer on one side respectively, on one side under the fusing point (Tmb)+40 of fusing point (Tmb)～composition B of composition B ℃, extruding mixing roll or single shaft with twin shaft, to extrude mixing roll mixing, makes the polyblend resin.At this moment, the diametrically of calm island component easy to control is considered, is preferably used twin shaft to extrude mixing roll.Method as the diameter of controlling polymers mixture structure, island component can be adjusted to above-mentioned scope by mixing ratio, the melt viscosity ratio with above-mentioned binary (composition A and composition B), is 200～20 in shear rate, 000sec ^-1, the holdup time is mixing control under 0.5～30 minute the condition.Particularly dwindling the method for island component diameter, can be low high method, the short method of holdup time of method, shear rate of melting temperature in the above-mentioned scope.The polyblend resin that contains the composition A that constitutes the fibre core composition and composition B can utilize other to extrude mixing roll but not spinning machine prepares in advance and use dry back, also can with spinning machine subsidiary extrude mixing roll in spinning the time prepare continuously.In advance under the situation that use the preparation back, be used for the section that whole polyblends of core composition can be prepared in advance, also can prepare the mother's section (master chip) that obtains with mixing composition A of high concentration or composition B, should mother's section mix the use of (chip blend) back with composition A and/or composition B section.From composition A and composition B are evenly disperseed, and the hot deterioration aspect of controlling composition A is easily considered, preferably use the polyblend that utilizes subsidiary single shaft mixing roll of spinning machine and/or twin shaft to extrude continuous prepared composition A of mixing roll and composition B, be supplied in the method for filament spinning component.

For example can adopt following method.At the curling processing unit (plant) of direct spinning stretching that uses as shown in Figure 9, polyblend with aliphatic polyester resin (A) or aliphatic polyester resin (A) and thermoplastic polyamide resin (B) is the core composition, with thermoplastic polyamide resin (B) is the sheath composition, under the condition of core sheath ratio (weight ratio) 65/35～10/90, when utilizing the spinning head squit hole to converge ejection, select melt viscosity than (η b/ η is a) in the combination of 0.2～2 scope, and to make spinning temperature be Tmb～Tmb+30 ℃ with respect to thermoplastic polyamide resin's (B) fusing point Tmb, the ejection linear velocity that makes the spinning head squit hole is 1～20m/ minute, formation spins silk, with from the spinning head surface vertically downward 0.01～0.15m as the cooling starting point, use from wind speed 0.3～1m/ second perpendicular to the direction of the vertical direction on spinning head surface, this spins silk the gas cooled that wind-warm syndrome is 15～25 ℃, after the multifilament that obtains carried out 2 sections stretchings with 2～5 times of comprehensive stretching ratios, curl and add man-hour, the draw roll that makes the 1st section is 50～90 ℃, the draw roll that makes the 2nd section is 90～150 ℃, final roll temperature after the stretching is 160～220 ℃, when being supplied in air flow jetting stuffer box crimping processing unit (plant), make the nozzle temperature of this device higher 5～100 ℃ than the final roll temperature after stretching, the processing of curling, form crimped yarn, derive behind the contact drum cooler, batch with the speed that is lower than the final roller 10～30% after the stretching.

Promptly, thermoplastic polyamide resins (composition B) such as aliphatic polyester resins such as poly-L-lactic acid (composition A) or polyblend (mixing of composition A and composition B) and nylon 6 is dry respectively, and the moisture rate of adjusting composition A in advance is that the moisture rate of 10～100ppm, composition B is 100～500ppm.Then, after utilize dividing other twin shaft to extrude mixing roll or single shaft to extrude mixing roll molten component A and composition B, after being 65/35～10/90 with different gear pump metering core sheath than (weight ratio), composite spinning head is as the spinning head that is configured in filament spinning component inside as shown in figure 12, make composition A and composition B converge ejection, obtain spinning silk.Need to prove, above-mentioned when using as the core composition with the polyblend resin of forming by composition A and composition B, in order to suppress the aggegation again of island component in the polyblend (composition A), the filtering layer of high order number is installed, and (blender (static mixer or high blender) is essential as the operations such as filtering layer of core composition in the little nonwoven fabric filter (filtering footpath 5 μ m～30 μ m) in #100～#200) or porous metals, filtration footpath, the assembly.In addition, aliphatic polyester in the polyblend and polyamide are immiscible system, and molten mass so existence spins the expansion that the back is called as Barus effect, makes refinement be out of shape unsettled tendency at elasticity item demonstration epistasis energy.Sheath composition of the present invention is that polyamide (composition B) has the effect that suppresses Barus effect, so it is effective that the thickness of the melt viscosity of composition B, sheath composition is adjusted to above-mentioned scope.In addition, as the method that suppresses Barus effect, following method is effective, the method of spinning temperature, the reduction tensile viscosity of promptly raising, perhaps increase spinning-nozzle the ejection aperture, reduce the method for ejection linear velocity (the polymer flow velocity of the final gathering portion of squit hole), perhaps increase the method for squit hole length and the ratio L/D in aperture, the method for quenching ejection strand etc.Figure 12 is the vertical section ideograph of one of form of the spinning head that uses in the method for the present invention of expression, spinning head be combination to be about to spinning head before the ejection be spinning head 2 (46) and the spinning head near spinning head 2 and before being present in it 1 (45) and constitute, described spinning head 1 SMIS composition, sheath composition have stream respectively.

During with mixing roll molten component A, composition B, preferably make composition A fusion under the temperature of the fusing point (Tma)+40 of fusing point (Tma)～composition A of composition A ℃, for example, when composition A is the PLA of 170 ℃ of fusing points, preferably at 170～210 ℃ scope molten component A.By making composition A in above-mentioned scope fusion, can suppress the hydrolysis of the low composition A of heat resistance, make composition A on long axis direction, be difficult to take place the viscosity inequality, spinnability becomes well, and so the fiber excellent in uniform that obtains is preferred.In addition, preferred component B fusion under the temperature of the fusing point (Tmb)+40 of fusing point (Tmb)～composition B of composition B ℃ for example, when composition B is the nylon 6 of 225 ℃ of fusing points, preferably makes its fusion 225～265 ℃ scope.By at above-mentioned scope molten component B, can suppress the gelation of composition B or painted, so preferred.

Spinning temperature can determine that the suitableeest scope is composition B fusing point Tmb～Tmb+30 ℃ (for example, when the fusing point Tmb of composition B was 225 ℃, the suitableeest scope was 225～255 ℃) according to the fusing point of composition B (polyamide).But the heat resistance of composition A is not high, if when fusion is stored greater than 250 ℃, the impatient acute tendency that worsens of existence then.Therefore, as mentioned above, preferably select fusing point be thermoplastic polyamide resin (B) below 250 ℃ as the sheath composition, and to make spinning temperature be below 260 ℃.

The ejection linear velocity of spinning head squit hole is preferably 1～20m/ minute.By making the ejection linear velocity is below 20m/ minute, can in filamentary cross section, evenly give shear stress, the strand of core composition and sheath composition evenly is orientated, in the thermal contraction of the curling processing of back, be difficult to apply excessive deformation at core sheath interface, thereby it is form the good crimped yarn of anti-fissility, so preferred.In addition, be more than 1m/ minute by making the ejection linear velocity, can suppress the extreme refinement of spinning, improve the uniformity of spinnability or crimped yarn, so preferred.The ejection linear velocity more preferably is 2～15m/ minute, more preferably 3～12m/ second.Need to prove,,, adopt following formula to calculate by squit hole area, total spray volume, hole count for the spinning head 2 (46) before the polymer ejection soon of Figure 12 about the ejection linear velocity among the present invention.The hole shape of spinning-nozzle under situations different between the hole, calculate the mean value of porose ejection area, use ejection area near the hole of this area, utilize following formula to calculate the ejection linear velocity.

Fig. 7 is the degree of depth, aperture, slit length, the spinning head profilograph of slit width and the ideograph of squit hole of explanation squit hole, and the right figure that slit length and the slit width in Y shape hole, leafy hole, the flat hole is shown in (a) irregularly-shaped hole is the ideograph of squit hole.

Ejection linear velocity (m/ minute)=Q/H/ ρ/A/100

Q: total spray volume (g/ minute)

H: hole count

ρ: fusion density (g/ minute)

ρ=1.08 * composition A is with respect to content (wt%)/100+1.00 * (1-composition A is with respect to the content (wt%)/100 of total weight of fiber) of total weight of fiber

A: ejection area (cm ²).

For example, when the spinning head squit hole is shaped as Y shape hole (referring to Fig. 7 (a) irregularly-shaped hole), can utilize A (cm ²The formula of)=3 * slit width (cm) * slit length (cm)+(triangle of the middle that is surrounded by slit) is calculated the ejection area, when slit width can be ignored with slit appearance ratio, ignore the area of (triangle of the middle that is surrounded by slit), utilize A (cm ²The formula of)=3 * slit width (cm) * slit length (cm) is calculated the ejection area.

The ratio L/D of the bore dia of spinning head squit hole (D) and the squit hole degree of depth (L) is preferably 0.6～10.By making L/D is below 10, and the core composition is configured in fibrillar center easily, thereby forms the good crimped yarn of anti-fissility, so preferred.In addition, be more than 0.6 by making L/D, can make the core sheath ratio between the filament even, so the anti-fissility of all fibres of formation multifilament is even and good, so preferred at each hole uniform distribution core composition, sheath composition.L/D more preferably is 0.7～8, more preferably 0.8～6, be preferably 0.9～4 especially.The squit hole degree of depth among the present invention is meant the squit hole degree of depth in the spinning head profilograph shown in Figure 7, is the length of the hole shape maintenance part identical with the shape of squit hole, the part of the flow velocity when being control ejection polymer.When squit hole was circular hole, the aperture was meant the diameter of circular hole in the squit hole ideograph shown in Fig. 7.Need to prove, when squit hole is not circular hole, utilize the method for putting down in writing in the explanation of ejection linear velocity, calculate ejection area A (cm ²), the diameter of regarding this ejection area as bowlder is the aperture.

When utilizing spinning head to converge ejection composition A and composition B, by make the core sheath than the melt viscosity of, composition A and composition B than the ejection linear velocity of the melt viscosity of, composition B, spinning head squit hole in above-mentioned scope, can be in spinning, stretching process, make core composition and sheath composition carry out molecularly oriented equably, and can make the evenly lining on the fiber long axis direction of sheath composition, so preferred.

Preferably with from the spinning head surface vertically downward 0.01～0.15m as the cooling starting point.By making the cooling starting point is below the 0.15m, energy quenching spinning, and make core composition and sheath composition carry out molecularly oriented equably easily, so preferred.In addition, be more than the 0.01m by making the cooling starting point, then be difficult to take place the spinning head surface and turn cold, spin the polymer that contains not fusion in the silk, cause spraying unfavorable conditions such as bad, improve the processability of manufacturing process, so preferred.Therefore, the cooling starting point more preferably is 0.02～0.13m, more preferably 0.03～0.12m.In order not reduce the temperature on spinning head surface, also preferably around the spinning head surface, dispose ring-shaped heater, actively heat the method on spinning head surface.

In order not reduce the temperature on spinning head surface, preferred cooling air is from blowing to for 15～25 ℃ and spin silk with wind speed 0.3～1m/ second, wind-warm syndrome perpendicular to the direction of the vertical direction on spinning head surface.

If fiber of the present invention is placed with the state or the drawn yarn of undrawn yarn, it is lax that orientation then takes place easily, if between the undrawn yarn package, exist to the time difference that stretches, perhaps between the drawn yarn package, exist to the time difference of the processing of curling, the amorphous phase molecularly oriented that the lax core composition of orientation then particularly takes place easily is at first lax, cause the difference of the heat shrinkability characteristic of core composition and sheath composition to become big, the result exists the curling core sheath interface that processes the crimped yarn that obtains to be easy to generate the tendency of residual stress.Therefore, preferred enforcement carried out spinning, stretching, the curling processing of the curling direct spinning stretching of handling continuously with 1 stage.That is, after preferably utilizing carry-over pinch rolls to derive to spin silk, do not batch, and stretch continuously, after the heat treatment, implementing directly curls processes.

Spin silk by batching, obtain undrawn yarn, the drawn yarn that this undrawn yarn that stretches the is obtained processing of curling, in order to improve the anti-fissility of core-sheath-type composite fibre of the present invention, in the processing of curling, make core sheath interface that excessive deformation not take place, formation two polarization are that the fibre structure of crystalline phase, irregular amorphous phase is very important.In being supplied in the drawn yarn of curling before handling, make two compositions carry out comparatively ideal of high orientationization equably for this reason, so, preferably the undrawn yarn that obtains with low spinning speed is stretched, improve the molecularly oriented of fiber by stretching process.This is because if improve spinning speed, makes the molecular chain orientation of core composition and sheath composition under molten condition, and then the degree of molecular orientation of each composition is easy to generate difference, is difficult to make the molecularly oriented homogenization of two compositions.According to the melt viscosity ratio of composition A under the molten condition and composition B, determine stress that each composition is applied, and spinning speed is high more, be that spinning tension is high more, it is big more to cause being applied to each composition upper stress difference.Therefore, preferably reduce spinning speed, make the degree of orientation homogenization of undrawn yarn SMIS composition, sheath composition.Spinning speed just when because of the melt viscosity of composition A and composition B core sheath ratio different when, but by making spinning speed is below 3000m/ minute, can keep low spinning tension, and can make the core composition in the undrawn yarn, the degree of molecular orientation homogenization of sheath composition, so preferred.And be more than 300m/ minute by making spinning speed, can suitably improve spinning tension, suppress the swing of spinning, stablize detailed performance, so preferably.Spinning speed more preferably is 350～2500m/ minute, more preferably 400～2000m/ minute, is preferably 450～1500m/ minute especially.

In the stretching process of back, make the low undrawn yarn of molecularly oriented of core composition and sheath composition carry out molecularly oriented, at this moment, by carrying out the stretching more than 2 sections interimly, and interim the draft temperature that improves, can improve the molecularly oriented of core composition and sheath composition equably, so preferred.

Final roller after utilization stretches carries out heat setting under 160～220 ℃ be extremely important.By heat-set temperature is increased to the limit, improve the motility of strand, can make the amorphous phase strand among aliphatic polyester (A), the thermoplastic polyamide resin (B) that two polarization take place respectively, promptly become the crystallization strand and be orientated strand lax, irregular configuration, so preferred.In addition, because the said temperature scope is near the fusing point Tma of aliphatic polyester, so in final last minute core composition of roller fusion, the distortion of accumulating the core sheath interface to the heat setting is released, the anti-fissility of the crimped yarn of gained improves tremendously.More preferably be more than 170 ℃, more preferably more than 180 ℃.On the other hand, be below 220 ℃ by the temperature that makes final roller, can avoid because the unfavorable condition that the fusion of sheath composition causes filament section deformation, core composition to expose on the surface, so preferably.More preferably be below 210 ℃, more preferably below 200 ℃.After utilizing final roller in above-mentioned scope, to carry out heat setting, supply in the nozzle immediately, promptly pass through pre-heat effect, the silk temperature that can utilize the short time will curl in the nozzle is heated near the fusing point (Tmb) of thermoplastic polyamide resin (B), simultaneously can make it under tension-free state, carry out thermal contraction, the result obtains the crimped yarn that core composition, sheath composition all have crystalline phase and random amorphous phase two phase structures, can suppress the distortion on the core sheath interface and the generation of residual stress thus first, significantly improve anti-fissility.In order to improve the silk temperature in the nozzle that curls, can preferably use the method for the distance of shortening, with the method for haybox cooking fiber and the method that heats with the noncontact heater from final roller to the nozzle that curls.

Need to prove, in the i.e. index of " the crimp extension rate after the boiling water treating " or curling firmness promptly aspect " percentage elongation under the restriction load " of the index of the bulkiness of the control crimped yarn that constitutes by the core-sheath-type composite fibre of the present invention, final roll temperature also is very important, final roll temperature is high more, and percentage elongation can be high more down for the crimp extension rate after the boiling water treating, restriction load.The present invention is a purpose to obtain the good crimped yarn of anti-fissility, in order to make the crimped yarn of intensity with required scope, preferably the temperature of the final roller with the temperature of comprehensive stretching ratio, draw roll, after stretching, the temperature of the nozzle that curls are adjusted to preferable range, and make the amorphous phase molecularly oriented fully lax in the processing of curling.In order to make boiling of core-sheath-type composite fibre of the present invention be received in required scope, the temperature of the temperature of the final roller after preferably will stretching, the nozzle that curls is adjusted to preferable range, and then, the contact drum cooler is also derived the back and utilized the final roller after stretching to batch with low velocity.

For example, implement 2 sections when stretching, the draw roll that preferably makes the 1st section is that 50～90 ℃, the 2nd section draw roll is 90～150 ℃, the final roller after stretching is 160～220 ℃, carries out heat setting.More preferably the 1st section draw roll is that 60～80 ℃, the 2nd section draw roll is 100～140 ℃, the final roller after stretching is 170～210 ℃.

Implement 3 sections when stretching, the draw roll that preferably makes the 1st section is that 50～90 ℃, the 2nd section draw roll is that 90～130 ℃, the 3rd section draw roll is 130～160 ℃, the final roller after stretching is 160～220 ℃.The draw roll that more preferably makes the 1st section is that 60～80 ℃, the 2nd section draw roll is that 100～120 ℃, the 3rd section draw roll is 140～150 ℃, the final roller after stretching is 170～210 ℃.

By making comprehensive stretching ratio be 2～5 times, also suitably improve molecularly oriented, can in the nozzle that curls, finish thermal contraction immediately, be difficult for the residual experience that applies excessive deformation at core sheath interface, more satisfactory.In addition, as mentioned above, by stretching with suitable stretching ratio, can also promote the crystallization of core composition, sheath composition, formation can be kept the crimped yarn of anti-fissility more chronically, and can also improve curling firmness, so preferred.Comprehensive stretching ratio more preferably is 2.5～4.5 times, more preferably 2.8～4.3 times.Comprehensive stretching ratio of the present invention is defined as the velocity ratio of the 1st section draw roll and the final roller after the stretching, and can utilize following formula to calculate.

Comprehensive stretching ratio=[speed of the final roller after the stretching (m/ minute)]/[speed of the 1st section draw roll (m/ minute)].

Final roller after utilization stretches carries out the drawn yarn of heat setting and preferably utilizes the nozzle in the aerojet stuffer box crimping processing unit (plant) to give curling.The curling processing unit (plant) that has the BCF silk of preferred wrapped configuration among the present invention as formation, can use the common curling applicator that adds the hot fluid processed, for example can adopt nozzle type (jet nozzle type), spray various curling adding methods such as filling type (jet stuffer type) or gear mode.In order to realize that high curling give and its remarkableization, the preferred nozzle mode is for example preferably used United States Patent (USP) the 3rd, 781, the curling nozzle of putting down in writing in No. 949 specifications etc.In order to improve the anti-fissility of crimped yarn, the preferred interior silk temperature of nozzle of curling that raises, make each filamentary core composition and sheath composition evenly and immediately be warming up to the condition of high temperature, carry out thermal contraction, preferably make the temperature of the nozzle that curls higher 5～100 ℃ than the final roll temperature after stretching.

Among the present invention, with the operation of separating carry out stretching process, curling adds man-hour, before curling nozzle was supplied with thread, it was extremely effective utilizing thermals source such as hot-rolling or hot plate that drawn yarn is heat-treated once more.By carrying out heat treatment once more, the silk temperature in the nozzle that curls is raise easily, as mentioned above, be difficult for the experience of difference of the heat shrinkability characteristic of residual core composition and sheath composition at core sheath interface, so preferably.Heat treated once more temperature is preferably 160～220 ℃, more preferably is 170～210 ℃, is preferably 180～200 ℃ especially.

Give curl after, contact and derives with drum cooler, the fixing fibre structure of crimped yarn thus, so the reduction receipts of boiling are preferably.The length that drum cooler contacts with crimped yarn (contact is long) is long more, gets over energy anchoring fiber structure, and then in the coiling process or senior manufacturing procedure of back, even crimped yarn is applied distortion, the fibre structure of crimped yarn also is difficult to change once again, and keeps the low receipts of boiling, so preferred.Contact length is preferably more than the 20cm, more preferably is more than the 30cm, more preferably more than the 40cm.

After contacting and derive with drum cooler,, preferably batch with the speed that is lower than the final roller after the stretching in order crimped yarn not to be applied excessive deformation.The temperature of drum cooler is generally 20～35 ℃.At this moment, coiling speed is 10～30% a low speed of the speed of final roller, and the fixing fibre structure of the drum that is cooled is not changed once more, and the low receipts state that boils of maintenance, be difficult to produce residual stress at core sheath interface, and then form the good crimped yarn of anti-fissility, so preferred.

By stretching between drum cooler and coiling machine with suitable tension force, deviation that can suppress to curl or inequality improve uniformity, so preferred.For example, can adopt between drum cooler and coiling machine 2 rollers of configuration, utilize the speed difference between roller and apply the method for tension force.At this moment, if tension force is too high, then curls sometimes and launch, so tensile stress is preferably 0.02～0.2cN/dtex, more preferably is 0.04～0.15cN/dtex.

Preferably any stage before batching crimped yarn with coiling machine, after batching is carried out interleaving treatment.Can adjust number of times, the processing pressure of interleaving treatment, the CF value that makes crimped yarn is 5～30, but before stretching process, implement be intertwined with the time untie because of stretching, so preferably be about to batch preceding enforcement.In addition, the strand before being about to batch is in the state of low-tension, so interweave with the compressed air of low-pressure easily.Therefore, crimped yarn is not applied excessive deformation, can improve anti-fissility, so preferred.Handle compressed air and be preferably 0.05～0.5MPa.By utilizing high velocity air to implement interleaving treatment, owing to carrying out uniform heat treatment easily, so can the shortening heat processing time.

On the other hand, be not limited to the processing of air flow jetting method stuffer box crimping, also can utilize the false twisting processing and implementation to curl and process.At this moment,, can form crystalline phase and not have orientation amorphous phase two phase structures, improve anti-fissility easily, so preferred by behind backtwisting, implementing the processing (Breria processing) that the limit heating edge is carried out high loose processing.

The crimped yarn that obtains thus can be used for fiber construct.Can also utilize conventional method that the crimped yarn that obtains is processed into carpet, as the automobile inside carpet.

The form of crimped yarn of the present invention can be the long fiber form, also the crimped yarn that obtains can be cut into suitable length, as staple fibre.

Need to prove, when crimped yarn is long fiber, preferably implements interleaving treatment and make the CF value in 3～30 scope.Herein, the CF value can be measured by the method for putting down in writing among the embodiment, is the index of the degree of expression pilotaxitic texture.By making the CF value is more than 3, can improve bringing together the property of crimped yarn, is reduced in the frictional force that produces between the filament, so during in spinning, senior processing or as goods, be difficult to take place excessive deformation, anti-fissility is good, so preferably.The CF value more preferably is more than 5, more preferably more than 7.And if the CF value is too high, then too in bond between the filament, suppress crimpiness (the crimp extension rate after the boiling water treating reduces), aspect the unequal harmful effect of can heating bulk (bulk up) operation (processing, boiling water treating or steam treatment for example dye), avoiding curling, consider, preferably the CF value is controlled at below 30.More preferably be below 25, more preferably below 20.

The total fiber number of crimped yarn of the present invention (fiber number of multifilament) is not particularly limited, considering aspect the time that the nozzle interior of curling is detained from easy prolongation crimped yarn, total fiber number is preferably below the 3000dtex, more preferably is below the 2500dtex, more preferably below the 2000dtex.In addition, the face of falling the cant is considered when easy inhibition applies external force to carpet, and total fiber number is preferably more than the 500dtex, more preferably is more than the 600dtex, more preferably more than the 700dtex.

Need to prove that the filamentary radical (single fiber dimension) that constitutes crimped yarn can freely be selected in the scope of filament fiber number of the present invention.

When using crimped yarn of the present invention, textiles, braided fabric, nonwoven fabric, nap fabric (pile), cotton etc. can be used in, other fiber can be contained as fiber construct.For example, can be with the doubling of natural fabric, regenerated fiber, semisynthetic fibre, synthetic fiber, twisted filament, mix and knit.As other fiber, can use synthetic fiber such as semisynthetic fibres such as natural fabrics such as cotton thread, fiber crops, wool, silk, artificial silk, copper ammonia fibre regenerated fibers such as (cupra), acetate fibre, nylon, polyester (polyethylene terephthalate, polybutylene terephthalate etc.), polyacrylonitrile and polyvinyl chloride etc.

Purposes as the fiber construct that has used crimped yarn of the present invention, can enumerate the dress material that requires ABRASION RESISTANCE, for example comprise outdoor clothes or golf clothes, physical culture clothes, anorak, snow slab clothes and their sportswears such as trousers, Casual Weares such as jacket, Ms men such as overcoat, insulated cold wear and raincoat use coat (outer).As requiring the long-time durability of using and the purposes of deterioration with moisture (moisture degradation) characteristic good, comprise uniform, quilt or cotton-padded mattress, next to the shin gently by, by thin slice such as pad class such as stove pad, cushion, baby's quilt, woollen blanket or pillow, cushion or covering, mattress or mattress, hospital with, medical, hotel with and thin slice for baby (sheets) etc., and laying materials such as covering (beddingmaterial) purposes of sleeping bag, cradle and perambulator etc., also can be preferred for such use.Can also be preferred for the interior automotive trim material, wherein, most preferably be used for the Carpet special for vehicle of requirement high-wearing feature and deterioration with moisture characteristic.Need to prove, be not limited to such use, for example can be used for agricultural with anti-blade material or construction material with waterproof sheet etc.Herein, Carpet special for vehicle as the purposes of preferred fiber construct among the present invention, to its processing form indefinite, for example, can use with flannelette blanket, Wilden (wilton) carpet, two-sided (double face) carpet, woven carpets such as Acker Munster (Axminster) carpet, tufting (tufting) carpet, embroidered carpets such as crochet hook woollen yarn knitting (hookedrug) carpet, bonded carpet, the electro-deposition carpet, bonding such as cord carpet (cord carpet) carpet, knitted carpet, carpet wovens such as raschel carpet, compression carpets such as needle punched carpet are the carpet with pile (pile) or its combination of representative.For with the more low-cost carpet that obtains being rich in sense of fullness, preferred at least by as the table silk of pile fiber silk, fetter the base cloth of this table silk and be attached to the tufted carpet of base fabric material (backing material) formation at this base cloth back side.

Embodiment

Below describe the present invention in detail with embodiment.Need to prove that the assay method among the embodiment uses following method.

A. the weight average molecular weight of aliphatic polyester

In the chloroformic solution of sample (aliphatic poly ester polymer), mix oxolane, as measuring solution.(GPC) measures this solution with gel permeation chromatography, converts with polystyrene, obtains weight average molecular weight.Need to prove, when measuring the weight average molecular weight of the aliphatic polyester in the fiber, sample is dissolved in the chloroform, remove by filter the polyamide residue, dry this chloroformic solution obtains aliphatic polyester, measures.

GPC device: Waters2690

Pillar: Shodex GPC K-805L (8mmID*300mmL) connects 2 to be used

Solvent: chloroform (using) with light, HPLC

Temperature: 40 ℃

Flow velocity: 1ml/ minute

Sample solution concentration: 10mg/4ml

Filter: Maishori-disk0.5 μ-TOSOH

Injection rate: 200 μ l

Detector: differential refractometer RI (Waters2410)

Reference material: polystyrene (concentration: 0.15mg sample/1ml solvent)

Minute: 40 minutes

B. the residual lactide amount of PLA

1g sample (polylactic acid polymer) is dissolved in the 20ml carrene, in this solution, adds 5ml acetone.Further use the cyclohexane constant volume, it is separated out, use island Jin She system GC17A, utilize liquid chromatography analysis, utilize the absolute standard curve to obtain the lactide amount.Need to prove, under the situation of the PLA in the fiber, obtain the blending ratio of PLA and polyamide in advance by TEM picture described later, utilize the above-mentioned lactide amount of blending ratio revisal and obtain.

C. carboxyl terminal concentration

The sample of precision weighing (the aliphatic poly ester polymer that utilizes following method extraction to obtain) is dissolved in orthoresol (moisture 5%), in this solution, add an amount of carrene after, utilize the titration of 0.02N KOH methanol solution, obtain carboxyl terminal concentration thus.At this moment, because oligomer generation hydrolysis such as lactide as the cyclic dimer of lactic acid, produce carboxyl terminal, thus the concentration of obtaining be comprise the carboxyl terminal of polymer and derive from monomer carboxyl terminal, derive from the concentration of whole carboxyl terminals of the carboxyl terminal of oligomer.Need to prove, the method of extracting aliphatic polyester from polyblend fibre (synthetic fiber) or core-sheath-type composite fibre is not particularly limited, but use chloroform dissolved fat adoption ester in the present invention, remove by filter polyamide, dried filtrate and extract and obtain aliphatic polyester.

D. the sulfuric acid relative viscosity and the intrinsic viscosity of polyamide thermoplastic

The relative viscosity of nylon 6 is by 98% sulfuric acid solution of preparation 0.01g/mL, obtains 25 ℃ of mensuration.The intrinsic viscosity of nylon 11 is by preparing the m-cresol solution of 0.5 weight %, obtaining 20 ℃ of mensuration.

E. the relative viscosity of aliphatic polyester

The relative viscosity of aliphatic polyester is by the o-chlorphenol solution of preparation 0.01g/mL, obtains 25 ℃ of mensuration.

F. the fusing point of polymer, watery fusion heat

Using the system differential scanning calorimetry (DSC) DSC-7 of PerkinElmer (Perkin Elmer) society type, the 20mg sample measured in the fusing endothermic curve that obtains with 10 ℃/minute programming rates, with the temperature of giving extreme value as fusing point (℃).In addition, the area (watery fusion peak area) that is surrounded by peak that is formed this extreme value and baseline is obtained the watery fusion heat Δ H (J/g) of polymer.

Can not obtain under the situation of raw polymer, judge the fusing point of original copolymer based on the differential calorimetric curve of fiber.Utilize following method to judge that the melting hump of the differential calorimetric curve of fiber belongs to the sort of composition.At first, with crimped yarn (fiber 1: be sample the crimped yarn that contains composition A, composition B), under condition determination same as described above, carry out DSC and measure, obtain differential calorimetric curve 1.Then, utilize solvent (chloroform) to remove composition A in the core-sheath-type composite fibre (fiber 1), the fiber of washing gained utilizes condition same as described above, to the fiber (fiber 2: the fiber that contain composition B) carry out DSC measure, obtain differential calorimetric curve 2 of vacuumize under the room temperature after 24 hours.Relatively differential calorimetric curve 1 and 2, judge that the melting hump that disappears is the melting hump of composition A, and then obtain fusing point by differential calorimetric curve 1.

Next, utilize solvent (sulfuric acid solution) to remove composition B in core-sheath-type composite fibre (fiber 1) the mesotheca composition, the fiber that washing obtains, utilize condition same as described above, to the fiber (fiber 3: the fiber that contain composition A and composition B) carry out DSC measure, obtain differential calorimetric curve 3 of vacuumize under the room temperature after 24 hours.Compare differential heat curve 1,2,3, judge the fusing point of the composition B in the sheath composition.At this moment, in order to obtain fiber 3, pre-determine the solvent processing condition (solvent temperature, dip time) of the composition B that in fact only removes the sheath composition.That is, take out the fiber that washing obtains, 24 times of vacuumize at room temperature the core-sheath-type composite fibre flooded certain hour in the solvent (sulfuric acid solution) of uniform temperature after.Utilize the fiber side of this fiber of observation by light microscope, confirm whether the sheath composition is removed.Repeatedly multiple solvent processing condition (solvent temperature, dip time) is carried out aforesaid operations, pre-determine the solvent processing condition of the composition B that in fact only removes the sheath composition.

G. the summation of the melting hump thermal capacity of the differential calorimetric curve of crimped yarn

With core-sheath-type composite fibre of the present invention is sample, under the condition identical with the F item, obtains differential calorimetric curve.Be the heat absorbing side of differential calorimetric curve, the peak with extreme value is judged as melting hump, the thermal capacity that accumulative total is obtained by the area of each melting hump, and then obtain the summation of thermal capacity.

H. melt viscosity η

Use the system Capirograph1B of Japan smart machine (strain) society, under blanket of nitrogen, be set at the temperature identical with measuring temperature, with shear rate 1216sec with spinning temperature ^-1Measure aliphatic polyester resin and thermoplastic polyamide resin's melt viscosity separately.Measure 3 times, with mean value as melt viscosity.Under the situation of core-sheath-type composite fibre, being resin below 240 ℃ for fusing point, measuring down for 240 ℃ in temperature, is under the situation of the resin more than 240 ℃ for fusing point, measures under fusing point+20 ℃.

I. aliphatic polyester resin exposes ratio, island farmland size and the blending ratio of area with respect to the fiber surface area of crimped yarn

Extract 1 filament that constitutes crimped yarn out, cut out ultra-thin section in direction (fiber cross section direction) perpendicular to fiber axis, with phosphotungstic acid the polyamide composition of this section is carried out metallochromy, the transmission electron microscope (TEM) that utilizes 40,000 times is observed, the admixture of photography fiber periphery integral body.Measure the fiber outer perimeter by this pinch image, further measure the total length of exposing of the white portion (aliphatic polyester resin) that is exposed to fiber surface, by exposing the area ratio that exposes that total length is obtained aliphatic polyester resin with respect to the white portion of fiber outer perimeter.In addition, use the image analysis software " WinROOF " of three paddy business (strain) to analyze this TEM photographs, as the size of farmland, island (non-dyeing portion), suppose that the farmland is circle, the diameter (diameter conversion) that obtain of will being converted by the area on farmland is (2r) as the farmland size.Need to prove that the farmland number of instrumentation is 100 on per 1 sample, remove 10 maximum farmland diameter values and 10 minimum farmland diameter values, obtain the distribution of 80 farmland diameters of residue.

Need to prove that the blending ratio of composition A and composition B is the sectional area ratio that utilizes the proportion revisal of each composition to be obtained by above-mentioned TEM picture (5.93 μ m * 4.65 μ m) in the fiber, obtains with the form of weight ratio.Herein, the proportion of each composition is PLA in the present embodiment: 1.24, nylon 6:1.14, nylon 11: 1.04, NYLON610: 1.08, nylon 6/66 copolymer: 1.14.

TEM device: the system H-7100FA of society of Hitachi type

Condition: accelerating potential 100kV.

J. the configuration of surface of crimped yarn

Extract 1 filament that constitutes crimped yarn out, utilize the electron microscope ESEM-2700 of Nikon Instech (strain) society system, with 5,000 times of observations of multiplying power, photography fiber surface state.Use the image analysis software " WinROOF " of three paddy business (strain) to analyze this photographs, measure the width (Breadth Maximum) of any 10 striated ditches, with the width of its mean value as the striated ditch.In addition, measure the length of each striated ditch, obtain aspect ratio (width of the length of striated ditch/striated ditch).The number of striated ditch is the number that is present among any 10 μ m of fiber surface * 10 μ m.

K. the hot reduction rate of phase solvation

Use the TG/DTA6200 of the system EXSTAR6000 of SII society series, the about 10mg sample of weighing (composition C) is obtained with 10 ℃ of/minute hot decrement curves of measuring of programming rate at 200 ± 0.5 ℃ of reduction rates of locating.

L. core sheath ratio

The weight of the core composition (A constitutes by composition) when metering is supplied in melt spinning respectively and the weight of sheath composition (B constitutes by composition), with the weight of core composition and sheath composition and as 100, by calculate core composition, sheath composition respectively with respect to this weight and weight rate calculate knockout sheath ratio.

When the weight rate of core composition and sheath composition is not known during manufacturing, can utilize following formula to simplify and calculate knockout sheath ratio.Promptly, the core composition of crimped yarn of the present invention contains composition A and other minor constituents sometimes, the sheath composition contains composition B and other minor constituents sometimes, even but in this case, also can regard the core composition as in fact only is made of composition A, the sheath composition only is made of composition B, and then can calculate the core sheath ratio as the weight ratio of core composition and sheath composition.

At first, make the cross-sectional slices of crimped yarn, the polyamide composition of this section is carried out metallochromy, utilize transmission electron microscope (TEM), with the cross section of 4,000 times of observation, the crimped yarn of photographing with phosphotungstic acid.At this moment, the region decision that is not colored is composition A, the region decision that is colored is composition B, distinguish core sheath interface, utilize the image analysis software " WinROOF " of three paddy business (strain) to carry out image analysis, obtain the gross area (Ab) in the zone of the gross area (Aa) in the zone that constitutes the core composition and formation sheath composition thus.The proportion of composition A is 1.26, the proportion of composition B is 1.14, utilizes following formula to calculate knockout sheath ratio.

The weight rate of the weight rate/sheath composition of core sheath ratio=core composition

The weight rate of core composition=[(Aa * 1.26)/(Aa * 1.26+Ab * 1.14)] * 100

The weight rate of sheath composition=[(Ab * 1.14)/(Aa * 1.26+Ab * 1.14)] * 100

TEM device: the system H-7100FA of society of Hitachi type

Condition: accelerating potential 100kV

M. the evaluation of core composition (polyblend) structure in the core-sheath-type composite fibre

Cut out ultra-thin section in the direction perpendicular to the fiber axis of core-sheath-type composite fibre, with phosphotungstic acid the polyamide composition of this section is carried out metallochromy, the transmission electron microscope (TEM) that utilizes 40,000 times is observed, photography mixed with polymers body structure.At this moment, the situation that island component is not colored is judged as mixed with polymers body structure (a), the situation that island component is colored is judged as mixed with polymers body structure (b), the situation that can not distinguish island component and sea component (it is slightly circular that each composition is not, and can not distinguish island and sea) is accredited as mixed with polymers body structure (c).

TEM device: the system H-7100FA of society of Hitachi type

Condition: accelerating potential 100kV.

N. the measuring diameter of the island component of core-sheath-type composite fibre SMIS composition (polyblend)

The mixed with polymers body structure is judged as (a) or (b) time in the M item, utilize the image analysis software " WinROOF " of three paddy business (strain) that photographs is resolved equally, suppose that island component is circle, the diameter that obtains to be converted by the area of island component is as the diameter of island component.Need to prove that the island number of mensuration is 100 on per 1 sample, distribute as the diameter distribution of island component with it.

O. the blending ratio (weight ratio) of the composition A/ composition B in the core-sheath-type composite fibre SMIS composition (polyblend)

Respectively metering when being supplied in melt spinning composition A and the weight of composition B, calculate blending ratio by the blending ratio of composition A and composition B.

When being difficult to measure respectively composition A and composition B in the manufacturing process, calculate the blending ratio (weight ratio) of composition A/ composition B by the core-sheath-type composite fibre.The core composition of core-sheath-type composite fibre of the present invention contains composition A, composition B and other minor constituents sometimes, in such cases, can be considered as the core composition and in fact only constitute, and then calculate the blending ratio (weight ratio) of composition A/ composition B by composition A and composition B binary.Use the image that photography obtains in the O item, and utilize the image analysis software " WinROOF " of three paddy business (strain), obtain the gross area (Aa) of the composition A that constitutes the core composition and the gross area (Ab) of composition B, the proportion of composition A is 1.26, the proportion of composition B is 1.14, utilizes following formula to calculate blending ratio.

Composition A/ composition B=(Aa * 1.26)/(Ab * 1.14)

At this moment, when in cross section, being difficult to distinguish the boundary line of sheath composition and core composition, in cross section, with to circumscribedly be present in outermost composition A, only the similar figure of the inner fiber cross section that contains composition A is distinguished sheath composition and core composition as the boundary line.

P. the minimum of a value of sheath composition thickness

Use is based on the observational technique of the crimped yarn cross section shown in the L item and the image of photographing and obtaining, the thickness of the part of the thickness minimum of sheath composition in this cross section of instrumentation.Random change obtains the part of crimped yarn cross-sectional slices, obtains 10 photographs, respectively it is carried out above-mentioned instrumentation, with the minimum of a value of its mean value as sheath composition thickness.

Q. the content of aliphatic polyester resin (A)

Take out 10g core-sheath-type composite fibre, its weight of weighing (W1) is as sample.This sample was flooded 24 hours in the chloroform of 25 ℃ of 500ml, composition A is carried out complete solution-off handle.Core-sheath-type composite fibre after the washing solution-off is handled, after under 25 ℃ dry 24 hours, the weight of weighing fiber (W2).Use W1, W2, utilize following formula to calculate the content of composition A.

The content of composition A (weight %)=(W1-W2) * 100/W1

R. fiber number

Utilize length meter to measure the 100m crimped yarn that forms bundle (hank) shape, measure the weight of the crimped yarn of filament length 100m, this weight is enlarged 100 times, obtain fiber number (dtex).Measure 3 times, with its mean value as fiber number (dtex).Filament fiber number (dtex) is tried to achieve by removing fiber number with the single fiber dimension.

S. intensity and degree of stretching

Utilize Orientech (strain) society system TENSILON UCT-100, under the constant speed elongation condition shown in the JIS L1013 (chemical fibre filament test method, 1998), measure sample (crimped yarn).Make grip separation (sample is long) be 200mm.Need to prove that elongation at break is obtained by the elongation of expression point of maximum intensity in the S-S curve.

T. boiling water shrinkage (receipts of boiling)

Sample (crimped yarn) was flooded 15 minutes in boiling water, utilize following formula to obtain boiling water shrinkage by the change in size before and after the dipping.

Boiling water shrinkage (%)=[(L ₀-L ₁)/L ₀] * 100

L ₀: strand is materialsed, and it is long to measure the bundle (hank) that obtains under initial load 0.088cN/dtex.

L ₁: will measure L ₀Reeled yarn under uncharge state, carry out boiling water treating, the bundle that obtains is measured in air-dry back under initial load 0.088cN/dtex long.

U. evenness fault U%

Use the system UT4-CX/M of Zellweger uster society, at yarn speed: 200m/ minute, minute: under 1 minute the condition, measure the U% (normal state) of sample (crimped yarn).

V. the crimp extension rate after the boiling water treating

Untie crimped yarn from the package (crimped yarn batches drum or bobbin) of the atmosphere of 25 ± 5 ℃ of environment temperatures, relative humidity 60 ± 10%, placing more than 20 hours, with this crimped yarn with no load condition impregnation process 30 minutes in boiling water.After the processing, air-dry 1 (about 24 hours) round the clock under above-mentioned environment are used as the sample of the crimped yarn after the boiling water treating.This sample is applied the initial load of 1.8mg/dtex, after 30 seconds, locate to mark at the long 50cm of sample (L1).Then, the mensuration load that applies 90mg/dtex replaces initial load, after 30 seconds, measures sample long (L2).Utilize the crimp extension rate (%) after following formula is obtained boiling water treating.

Crimp extension rate (%)=[(L2-L1)/L1] * 100.

W. the crimp extension rate after the boiling water treating under restriction is loaded (the restriction load is percentage elongation down)

During boiling water treating, on crimped yarn, hang the load of 2mg/dtex and measure, in addition, obtain the crimp extension rate in the same manner, should be worth as percentage elongation under the restriction load with the M item.

The X.CF value

Under the condition shown in the interleaving degree of JIS L1013 (chemical fibre filament test method) 7.13, measure.Test number (TN) is 50 times, utilizes following formula to obtain CF value (correlation factor, Coherence Factor) by the mean value L (mm) that interweaves long.

CF value=1000/L

Y. degree of profile

Cut out the cross section of sample (crimped yarn), utilize following formula, obtain degree of profile by the circumscribed diameter D1 and the filament cross section inscribe diameter of a circle D2 of filament cross section.

Degree of profile=D1/D2.

Z. the degree of profile of core-sheath-type composite fibre

Use is obtained degree of profile by circumscribed diameter D1 of crimped yarn cross section and filament cross section inscribe diameter of a circle D2 based on the observational technique of the crimped yarn cross section shown in the L item and the image of photographing and obtaining utilizes following formula.Equally, utilize following formula, by the circumcircle diameter D3 of the cross section of core and the degree of profile that inscribed circle diameter D4 obtains core.

Degree of profile=D1/D2

Degree of profile=D3/D4

AA. the ABRASION RESISTANCE evaluation of drawn yarn

On roller, batch fixedly sand paper (P600 number) with the certain rotation speed rotation, as shown in Figure 3, one end of drawn yarn is fixing on the wall, the other end is applied load, drawn yarn is moved around on one side with certain speed, make on one side the roller rotation,, measure the roller rotation number when drawn yarn is cut off with sand paper wear tension silk.Condition determination is as follows.

Rotary body diameter: 80mm

The contact of silk is long: 62.8mm

The contact angle of silk: 90 °

Roller rotation number: 160rpm

Width moves around: 10mm

Speed moves around: 3 times

Measure load: 0.06cN/dtex.

BB. the ABRASION RESISTANCE of crimped yarn

Use the made fine rule abrasion tester of peace rattan ironworker, on roller, batch P600 sand paper, utilize following condition to make the roller rotation, measure the roller rotation number of cutting off to silk.

Rotary body diameter: 40mm

The contact of yarn is long: 110mm

Roller rotation number: 200rpm

Measure load: 0.4cN/dtex

CC. the containing ratio of the above crystallization nucleating agent of the average grain diameter D50 of crystallization nucleating agent and 10 μ m

Use the system SALD-2000J of Shimadzu Seisakusho Ltd., utilize laser diffractometry to measure the average grain diameter D50 (μ m) of crystallization nucleating agent.Obtain the volume % of the crystallization nucleating agent more than the 10 μ m by the size distribution that obtains.

DD. the evaluation of spinnability

When obtaining the bobbin bag of 100kg, utilize the number of times that causes broken string to estimate spinnability.Estimate with good (two circle), good (zero), qualified (△), defective (*) 4 grades.

Two circles: do not have broken string

Zero: 1～5 times broken strings

△: 6～10 broken strings

*: broken string more than 11 times

EE. the ABRASION RESISTANCE of carpet (wearing and tearing reduction rate)

Crimped yarn is applied S sth. made by twisting, Z sth. made by twisting, with merge 2 make after the twisted filament batch silk with bobbin bag form under metalliferous dye (" Irgaran Red 4GL " [vapour Ba-Jia Ji (Ciba-Geigy) society system]) 0.6%owf, bath raio (bath ratio) 1: 50, pH=7,98 ℃ condition, handled dyeing 60 minutes.Further washing, 50 ℃ of heated-air dryings 24 hours, the twisted filament that obtains dyeing.As the table silk, after forming bundle on the PP spun-bonded non-woven fabrics, at the back side of base cloth coating base fabric (backing) material, drying obtains tufted carpet (weight per unit area 1200g/m with this twisted filament ²).

Above-mentioned tufted carpet is cut into the circle of diameter 120mm,, makes test film in the hole that central authorities open 6mm.After measuring the weight W 0 of this test film, the surface is installed on the TABER abrasion tester (Rotary Abaster) of ASTM D1175 (1994) regulation up, under the condition of H#18 abrasion wheels, compression load 1kgf (9.8N), sample holder rotary speed 70rpm, wearing and tearing number of times 5500 times, carry out wear test, the sample weight W1 after the mensuration wear test.Use said determination value and following formula to calculate the wearing and tearing reduction rate.

Wearing and tearing reduction rate (%)=(W0-W1) * 100/ (W2 * A1/A0)

W0: the weight (g) of circular carpet before measuring

W1: the weight (g) of measuring the circular carpet in back

W2: the weight per unit area (g/m of carpet ²)

A0: the gross area (m of circular carpet ²)

A1: the gross area (m of the part of abrasion wheels contact ²).

FF. sense of touch of carpet (flexibility) and outward appearance (reflecting feel)

Under metalliferous dye (" Irgaran Red 4GL " [vapour Ba-Jia Ji society system]) 0.6%owf, bath raio 1: 50 (as carpet), pH=7,98 ℃ condition, handled dyeing 60 minutes.Sense of touch (flexibility) when affirmation is pushed this dyeing carpet with palm and under sunshine reflecting feel, the gloss uneven during perusal, sense of touch, outward appearance are carried out the evaluation of 4 grades respectively.

Two entelechies are good

Zero ... good

△ ... equal with existing goods

* ... poorer than existing goods

GG. the anti-fissility of the core sheath compound interface of core-sheath-type composite fibre

The braiding grey tube cloth that making is made of crimped yarn, to weave grey tube cloth under metalliferous dye (" Irgaran Red 4GL " [vapour Ba-Jia Ji society system]) 0.6%owf, bath raio 1: 50 (as the braiding grey tube cloth), pH=7,98 ℃ condition, handled dyeing 60 minutes.The dyeing after washing, 50 ℃ of following heated-air dryings 24 hours, the braiding grey tube cloth after obtaining dyeing.Cut out the rectangle of 50 * 100mm as sample by the braiding grey tube cloth after the dyeing, use anti-frictional testing machine (SCOTT TYPE CREASE-FLEXABRATION TESTER, society of the smart device making of (strain) Daiei science institute system, the model: CF-10N) of rubbing of Scott type, after implementing to rub friction under the condition of test number (TN) 1000 times, chuck interval 0mm, friction swing 45mm, nip load 0.5kg, take out this sample, applied the appearance change of the part of rubbing friction according to following benchmark evaluation.Then, same braiding grey tube cloth is measured 5 times, the total points of utilizing each to estimate is determined overall merit.

＜metewand 〉

5 minutes: the outward appearance no change

4 minutes: local visible light colorization

3 minutes: visible light colorization, local visible balling-up.

2 minutes: a large amount of balling-ups, take place in visible whiting.

1 minute: a large amount of balling-ups, take place, the sample broken hole in visible whiting.

＜overall merit 〉

Two circles (good): 21～25 minutes

Zero (well): 16～20 minutes

△ (qualified): 11～15 minutes

* (poor): 5～10 minutes.

HH. the wearing and tearing reduction rate of carpet

Based on JIS L1096:1999 8.17.3Taber type method, use the H-18 abrasion wheels, the pairing left and right abrasion wheels is applied the load of 1kgf (9.8N) respectively, the rotation number of rotation regulation, after making the carpet wearing and tearing, utilize following formula, by its not the weight per unit area of wearing part and wearing part (referring to JIS L1096:1999 Figure 20) calculate wearing and tearing reduction rate (%).

Wearing and tearing reduction rate (%)=[the pile weight per unit area of (the not pile weight per unit area of the pile weight per unit area-wearing part of wearing part)/wearing part] * 100

Rotation number is 300 times and 5500 2 conditions.

II. the wearing and tearing reduction rate behind the hydrothermal aging

Carpet after handling 1200 hours under 50 ℃ of temperature, humidity 95% atmosphere is carried out and the identical experiment of above-mentioned HH item, obtain the wearing and tearing reduction rate.Wherein rotation number is 1000 times.

JJ. the heat resistance of carpet (long fiber flax pad, line mat)

Utilize Miura Press to make made 300t press, under 150 ℃ of forming temperatures, exert pressure, estimate appearance change.

◎: no change.

Zero: slight impression is arranged.

*: the heat bonding that pile takes place.

KK. colour rendering

Chromonemal carpet has been used in perusal, utilizes following benchmark to estimate.

◎: good especially.

Zero: good.

△: compare with other synthetic fiber, do not see difference.

LL. the intensity of automotive seat cloth and silk

Sign band (labeled strip) method according to JIS L1096:1999 8.12.1A method (band method), under 20 ℃ of atmosphere temperatures, laterally respectively get 3 test films respectively vertical reaching, remove silk from the both sides broadside, make its wide 30mm of being, utilize constant speed tension type (the system Autograph (AG-G) of Shimadzu Seisakusho Ltd.) testing machine, under the condition of grip separation 150mm, draw speed 200mm/min, test, measure the fracture strength of this moment, calculate the mean value of 6 test films.

The strength retention of automotive seat cloth and silk in MM.90 ℃ of atmosphere

Except that atmosphere temperature is become 90 ℃, measure the intensity of cloth and silk in the same manner with above-mentioned LL item, utilize following formula to calculate strength retention.

Cloth and silk strength retention (%)=(intensity under the intensity/20 ℃ atmosphere under 90 ℃ of atmosphere) * 100

NN. the wearing and tearing decrement of automotive seat cloth and silk

Based on JIS L1096:1999 8.17.3Taber type method, use the H-18 abrasion wheels, the pairing left and right abrasion wheels is applied the load of 0.5kgf (4.9N) respectively, rotate 3000 times, make its wearing and tearing after, the reduction of mensuration cloth and silk quality.

[Production Example 1] (preparation of PLA)

Make by the lactide of the L lactic acid of optical purity 99.8% preparation in the presence of two (caproic acid 2-ethyl ester) tin catalyst (lactide with respect to the mol ratio of catalyst=10000: 1),, obtain PLA P1 in blanket of nitrogen, 180 ℃ of following polymerizations 240 minutes.The weight average molecular weight of the PLA that obtains is 23.3 ten thousand.Residual lactide amount is 0.12 weight %.

[Production Example 2] (containing the preparation of the PLA of 10 weight % polycarbodiimides)

After dry P1 and day spinning (strain) system polycarbodiimide " LA-1 " clearly, make P1: LA-1=90: 10 (weight ratios) are supplied in the twin shaft mixing extruder, and are mixing down 200 ℃ of sleeve (cylinder) temperature, obtain containing the PLA P2 of 10 weight %LA-1.The residual lactide amount of the PLA that obtains is 0.14 weight %.

[Production Example 3] (preparation of PLA)

In the presence of two (caproic acid 2-ethyl ester) tin catalyst (lactide with respect to the mol ratio of catalyst=10000: 1), make by the lactide of the L lactic acid preparation of optical purity 99.8% blanket of nitrogen, 180 ℃ of following polymerizations 150 minutes, obtain PLA P3.The weight average molecular weight of the PLA that obtains is 150,000.Residual lactide amount is 0.10 weight %.

[Production Example 4] (preparation of PLA (P4))

In the presence of two (caproic acid 2-ethyl ester) tin catalyst (lactide with respect to the mol ratio of catalyst=10000: 1), make by the lactide of the L lactic acid preparation of optical purity 99.5% blanket of nitrogen, 180 ℃ of following polymerizations 220 minutes, obtain PLA (P4).The weight average molecular weight of the PLA that obtains (P4) is 210,000.Residual lactide amount is 0.13 weight %.The fusing point of polymer (P4) is that 170 ℃, the thermal capacity of melting hump are that 45J/g, melt viscosity are 200Pasec ^-1, relative viscosity is 3.42.

[Production Example 5] (preparation of PLA (P5))

In the presence of two (caproic acid 2-ethyl ester) tin catalyst (lactide with respect to the mol ratio of catalyst=10000: 1), make by the lactide of the L lactic acid preparation of optical purity 99.5% blanket of nitrogen, 180 ℃ of following polyase 13s 50 minutes, obtain PLA (P5).The weight average molecular weight of the PLA that obtains (P5) is 260,000.Residual lactide amount is 0.14 weight %.The fusing point of polymer (P5) is that 170 ℃, the thermal capacity at fusing point peak are 45J/g.Melt viscosity is 300Pasec ^-1Relative viscosity is 3.76.

[Production Example 6] (preparation of PLA (P6))

In the presence of two (caproic acid 2-ethyl ester) tin catalyst (lactide with respect to the mol ratio of catalyst=10000: 1), make by the lactide of the L lactic acid preparation of optical purity 99.5% blanket of nitrogen, 180 ℃ of following polymerizations 150 minutes, obtain PLA (P6).The weight average molecular weight of the PLA that obtains (P6) is 150,000.Residual lactide amount is 0.10 weight %.The fusing point of polymer (P6) is that 170 ℃, the thermal capacity of melting hump are that 48J/g, melt viscosity are 120Pasec ^-1, relative viscosity is 3.04.

[Production Example 7] (preparation of PLA (P7))

At two (caproic acid 2-ethyl ester) tin catalyst (with molar ratio computing, L lactic acid lactide: D lactic acid lactide: under existence catalyst=8900: 1100: 1), make by the lactide of the L lactic acid of optical purity 99.5% preparation and by the lactide of the D lactic acid preparation of optical purity 99.5% blanket of nitrogen, 180 ℃ of following polymerizations 220 minutes, obtain PLA (P7).The weight average molecular weight of the PLA that obtains (P7) is 210,000.Residual lactide amount is 0.12 weight %.The fusing point of polymer (P7) is that 130 ℃, the thermal capacity 38J/g of melting hump, melt viscosity are 200Pasec ^-1Relative viscosity is 3.42.

[Production Example 8] (containing the preparation of the PLA (P8) of 10 weight % polycarbodiimides)

Behind dry P4 and the composition C (spinning (strain) system polycarbodiimide " LA-1 " day clearly), make P4: LA-1=90: 10 (weight ratios) are supplied in the twin shaft mixing extruder, and are mixing down 200 ℃ of sleeve temperature, obtain containing the PLA (P8) of 10 weight %LA-1.The residual lactide amount of the PLA that obtains (P8) is 0.15 weight %.The fusing point of polymer (P8) is that 170 ℃, the thermal capacity of melting hump are that 44J/g, melt viscosity are 190Pasec ^-1, relative viscosity is 3.38.

[Production Example 9] (containing the preparation of the PLA (P9) of 10 weight %MADGIC)

Behind dry P4 and the composition C (four countries change into (strain) system monoene propyl group diglycidyl isocyanuric acid ester (hereinafter referred to as MADGIC)), make P4: MADGIC=90: 10 (weight ratios) are supplied in the twin shaft mixing extruder, mixing down 200 ℃ of sleeve temperature, obtain containing the PLA (P9) of 10 weight %MADGIC.The residual lactide amount of the PLA that obtains (P9) is 0.15 weight %.The fusing point of polymer (P9) is that 170 ℃, the thermal capacity of melting hump are that 44J/g, melt viscosity are 190Pasec ^-1, relative viscosity is 3.38.

[Production Example 10] (containing 10 weight % is the preparation of the PLA (P10) of the compound that obtains of main chain, grafting polymethyl methacrylate with the ethylene-propylene acid glycidyl ester)

Behind dry P4 and the composition C (Japanese grease (strain) system " Modiper A4200 " (being designated hereinafter simply as " Modiper ")), with P4: " Modiper "=(weight ratio) was supplied in the twin shaft mixing extruder in 80: 20, mixing down 200 ℃ of sleeve temperature, obtain containing the PLA (P10) of 20 weight % " Modiper ".The residual lactide amount of the PLA that obtains (P10) is 0.15 weight %.The fusing point of polymer (P10) is that 170 ℃, the thermal capacity of melting hump are that 44J/g, melt viscosity are 190Pasec ^-1, relative viscosity 3.38.

(embodiment 1)

Dry respectively PLA P1 (177 ℃ of fusing points) as composition A, as the sulfuric acid relative viscosity of composition B 2.15 nylon 6 (225 ℃ of fusing points), the moisture rate of adjusting composition A is 50～100ppm, the moisture rate of composition B is 100～300ppm, with mixing ratio (weight ratio) the P1/ nylon 6=30/70 mixing of cutting into slices, pack in the spinning hopper 1 of the device for spinning with twin shaft mixing roll shown in Figure 6, import twin shaft and extrude mixing roll 2, utilize spinning manifold 3 meterings to discharge molten polymer, molten polymer is imported the filament spinning component 4 that is present in casing 3 inside, spin from spinning-nozzle 5.Spinning head uses the Y shape hole of following record.At this moment, to blow out the mode that hole upper end is positioned at the position of 3cm under the spinning head surface ring-type path 6 (cooling off long 30cm) is set, cooling curing strand 7 utilizes oiling device 8 and oiling device 9 to carry out 2 sections and oils.And it is 60 ℃ in the temperature of the 1st warm-up mill 11 (hereinafter referred to as 1FR), under spinning speed 700m/ minute the condition, after Stretching rollers 10 derivation, the temperature that makes the 2nd warm-up mill 12 (hereinafter referred to as 1DR) is 120 ℃, to carry out the 1st section stretching (stretching ratio: 2.7 times) in 1890m/ minute, the temperature that further makes the 3rd warm-up mill 13 (hereinafter referred to as 2DR) is 157 ℃, to carry out the 2nd section stretching (stretching ratio: 1.37 times) in 2590m/ minute, then, utilize air flow jetting tamponade device 14 under 220 ℃ of nozzle temperatures, to heat, compressed air is handled, thereby curl processing, forming 3 dimensions curls, after contact drum cooler 15 and the derivation, by tension detection detector 16, utilize carry-over pinch rolls 17 to derive, utilize interweave nozzle 18 apply to interweave on one side, on one side at coiling tension 120g (0.08cN/dtex), utilize coiling machine 19 to batch under the condition of coiling speed 2200m/ minute (than the speed of 2DR speed low 15%).The PLA crimped yarn that obtains is 1500dtex, 96 filaments.The melt spinning condition is as follows.Need to prove that the ejection linear velocity in the spinneret hole in the following condition is 0.184m/ second.The elongation at break of the drawn yarn that obtains in 2DR outlet sampling is 35%.

Biaxial extruder temperature: 225 ℃

Shear rate when mixing: about 2000sec ^-1

Spinning temperature: 240 ℃

Filtering layer: fill 46# white alumina sand (white morundum sand)

Filter: 20 μ m nonwoven fabric filters (Dynaloy)

Spinning head: the wide 0.14mm of slit, the long 0.7mm of slit, hole depth 0.6mm

Spray volume: 330g/ minute (1 assembly, 1 strand, 96 filaments)

Cooling: 19 ℃ of cooling air temperature, wind speed 0.55m/ second

Finish: adhere to 10% finish (pure oil content is 1.5%owf) that forms with the mixed of polyethers finish 15, low viscosity mineral oil 85 with respect to silk thread.

It is extremely stable in whole operations of spinning, stretching, bulk arrangement to get about 100kg crimped yarn sample, does not break, monofilament flows etc.

Cross section to the fiber that obtains carries out tem observation, obtains homodisperse island structure, and the area that exposes of PLA is 1.5% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.03 μ m～0.3 μ m with diameter.The section in this cross section of alkaline etching, PLA is removed in dissolving, observes, and can find that island component comes off, and confirms that thus PLA forms island component.

Fiber surface forms striated ditch shown in Figure 2, and the mean value of this striated ditch width is that 0.26 μ m, aspect ratio (length of striated ditch/striated ditch wide) are 20.The fiber that obtains shows good fibrous physical property, i.e. TENSILE STRENGTH: 2.8cN/dtex, residual percentage elongation: boiling water shrinkage 48%: 2.8%, evenness fault U%:0.8%, crimp extension rate: degree of profile 12%: 2.5.In DSC, can be observed fusing point (nylon 6), the melting hump of each composition of resulting near (PLA) near 175 ℃ and 225 ℃.The carboxyl terminal concentration of the PLA that is extracted by this fiber is 18 equivalents/ton.The broken string rotation number that obtains in the wear test is 101 times, and shows good ABRASION RESISTANCE.Further use this crimped yarn to make carpet evaluation, the reduction rate that weares and teares this moment is 25.5%, also shows good ABRASION RESISTANCE as carpet.This carpet is soft, and the hardness appropriateness has moist silk sample gloss.

(embodiment 2)

Except that the mixing ratio of P1/ composition B is 10/90, operate obtaining the BCF silk in the same manner with embodiment 1.The spinnability of embodiment 2 is identical with embodiment 1, and is extremely stable.Cross section to the fiber that obtains carries out tem observation, obtains homodisperse island structure, and the area that exposes of PLA is 0.1% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.01 μ m～0.15 μ m with diameter, and the dispersion diameter of island component is lower than embodiment 1.The section in this yarn cross section of alkaline etching, PLA is removed in dissolving, observes, and finds that island component comes off, and confirms that thus PLA forms island component.The degree of profile of the fiber that obtains is 2.4, and fibrous physical property is also good.Can be observed fusing point (nylon 6), the melting hump of each composition of resulting near (PLA) near 175 ℃ and 225 ℃ among the DSC.The broken string rotation number of the multifilament that obtains in wear test is 185 times, is better than embodiment 1.

Further use this crimped yarn to make carpet evaluation, ABRASION RESISTANCE is better than embodiment 1 as a result, and is soft.But it is dark slightly that reflecting feel is compared with embodiment 1.

(embodiment 3)

Except that the mixing ratio of P1/ composition B is 40/60, operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of embodiment 3 is identical with embodiment 1, and is extremely stable.Cross section to the fiber that obtains carries out tem observation, obtains homodisperse island structure, and the area that exposes of PLA is 3.2% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.03 μ m～0.8 μ m with diameter, and the dispersion diameter of island component is greater than embodiment 1.Use this crimped yarn to make carpet evaluation, though ABRASION RESISTANCE is good not as embodiment 1, sense of touch, outward appearance are all good than existing goods.

(embodiment 4)

Except that the mixing ratio of P1/ composition B is 5/95, operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of embodiment 4 is identical with embodiment 1, and is extremely stable.Cross section to the fiber that obtains carries out tem observation, obtains homodisperse island structure, and the area that exposes of PLA is 0% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.01 μ m～0.1 μ m with diameter, and the dispersion diameter of island component is minimum, and the quantity on island is also few.Fiber surface at this crimped yarn does not form the striated ditch basically.Use this crimped yarn to make carpet evaluation, identical with embodiment, the flexibility height, sense of touch is good, but reflecting feel and existing goods are equal.

(embodiment 5)

The nylon 6 (225 ℃ of fusing points) that removes use sulfuric acid relative viscosity 2.05 is as composition B, and the mixing ratio of P1/ composition B is outside 47/53, operates in the same manner with embodiment 1, obtains the BCF silk.The expansion of the discharging jet that is caused by Barus effect among the embodiment 5 under spinning head is big slightly.When carrying out the sampling of 100kg crimped yarn, broken string takes place 2 times, spinnability is slightly not as embodiment 1.Cross section to the fiber that obtains carries out tem observation, obtains homodisperse island structure, and the area that exposes of PLA is 5.0% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.03 μ m～0.8 μ m with diameter, compares with embodiment 1, and the dispersion diameter of island component is big slightly.Use this crimped yarn to make carpet evaluation, ABRASION RESISTANCE is good not as embodiment 1.Sense of touch is thick and stiff a little, but has moist silk sample gloss.

(comparative example 1)

Except that only using composition A (PLA P1), operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of comparative example 1 is identical with embodiment 1, and is stable.The broken string rotation number of the crimped yarn that obtains in wear test is 9 times, the ABRASION RESISTANCE extreme difference.When using this crimped yarn to make carpet to estimate, the wearing and tearing reduction rate is 89%, is the level that quite limits purposes.

(embodiment 6)

Except that using PLA P3 (178 ℃ of fusing points) to become the following spinning condition as composition A and with condition, operate in the same manner with embodiment 1, obtain the BCF silk.

The shear rate of twin shaft mixing roll: about 280sec ^-1

Filtering layer constitutes: the bead of filling φ 1mm

Filter: 200# wire gauze filter

The refinement point of embodiment 6 under spinning head is unstable, and discharging jet is unstable a little.When carrying out the sampling of 100kg crimped yarn, broken string takes place 3 times, compare with embodiment 1, spinnability is poor slightly.When the cross section of the fiber that obtains was carried out tem observation, though find to obtain island structure, the area that exposes of PLA was 1.9% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.3 μ m～2.5 μ m with diameter, and the dispersion diameter of island component is big, and it is wide to distribute.The irregular U% of Wu Site of expression evenness fault is 2.1%, and is higher, has the thickness inequality on the strand long axis direction.Use this crimped yarn to make carpet evaluation, compare with embodiment 1, the wearing and tearing reduction rate is about 2 times.The sense of touch part is thick and stiff, and reflecting feel is and has the goods peer-level now.

(comparative example 2)

Except that use PLA P3 (178 ℃ of fusing points) as the nylon 6 (225 ℃ of fusing points) of composition A, sulfuric acid relative viscosity 2.90 as the composition B, operate in the same manner with embodiment 1, obtain the BCF silk.In the comparative example 2, under spinning head, cause great expansion, therefore, the pulsation phenomenon that refinement point changes up and down takes place, state labile by Barus effect.When carrying out the sampling of 100kg crimped yarn, frequently broken string takes place, totally 17 times, spinnability is on duty mutually.Cross section to the fiber that obtains carries out tem observation, though obtain island structure, island component is colored.So, if by alkaline etching stripping PLA, then only residual island component, and become hairline, so PLA forms sea component as can be known.The intensity of this crimped yarn is 1.1cN/dtex, and is lower, and evenness fault U% is 4.5%, also extreme difference.Use this crimped yarn to make carpet evaluation, the wearing and tearing reduction rate is 87%, is peer-level with only using PLA (comparative example 1), and purposes is quite restricted.

Table 1

	Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Embodiment 5	Comparative example 1	Embodiment 6	Comparative example 2
									Composition A	PLLA	PLLA	PLLA	PLLA	PLLA	PLLA	PLLA	PLLA
Weight average molecular weight	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	15.0 ten thousand	15.0 ten thousand
									Fusing point (℃)	177	177	177	177	177	177	178	178
Residual lactide amount (weight %)	0.12	0.12	0.12	0.12	0.12	0.12	0.10	0.10
									Melt viscosity (Pas)	225	225	225	225	225	225	116	116
									Composition B	N6	N6	N6	N6	N6	-	N6	N6
Relative viscosity (or intrinsic viscosity)	2.15	2.15	2.15	2.15	2.05	-	2.15	2.90
									Fusing point (℃)	225	225	225	225	222	-	225	225
Watery fusion heat (J/g)	78	78	78	78	82	-	78	76
									Melt viscosity (Pas)	58	58	58	58	43	-	58	250
									Blending ratio (composition A/ composition B, %)	30/70	10/90	40/60	5/95	47/53	100/0	40/60	30/70
Melt viscosity is than (η b/ η a)	0.26	0.26	0.26	0.26	0.19	-	0.50	1.11
The rerum natura of fiber
									Island component	PLLA	PLLA	PLLA	PLLA	PLLA	-	PLLA	N6
Sea component	N6	N6	N6	N6	N6	-	N6	PLLA
									Composition A exposes area ratio (%)	1.5	0.1	3.2	0	5.0	0	1.9	83.3
The farmland size of island component (μ m)	0.03～0.3	0.01～0.15	0.03～0.8	0.01～0.1	0.03～0.8	-	0.3～2.5	-
									The width of fiber top layer striated ditch (μ m)	0.26	0.12	0.36	-	0.38	-	0.85	-
The aspect ratio of fiber top layer striated ditch	20	17	24	-	25	-	16	-
									The quantity (individual) of fiber top layer striated ditch	7	1	10	-	13	-	1	-
Carboxyl terminal concentration (eq/ton)	18	20	17	20	20	17	18	18
									The degree of profile of silk cross section	2.5	2.4	2.6	2.3	2.3	3.0	2.1	2.8
Fiber number (dtex)	1500	1500	1500	1500	1500	1500	1500	1500
									Intensity (cN/dtex)	2.8	3.0	2.6	3.0	2.4	1.5	2.2	1.1
Degree of stretching (%)	48	44	49	43	50	48	44	38
									U％(％)	0.8	0.7	0.9	0.6	1.0	1.0	2.1	4.5
Boiling water shrinkage (%)	2.8	3.0	2.6	3.1	2.4	5.5	3.2	4.0
									ABRASION RESISTANCE (broken string number of times)	101	185	85	198	52	9	28	11
Crimp extension rate (%)	12	13	10	13	8	4.5	9	2.8
									The restriction load is percentage elongation (%) down	3.5	4	3	4	2.5	1.5	3	1
									The rerum natura of fiber construct
The wearing and tearing reduction rate (%) of carpet	25.5	18.1	32.3	15.0	38.8	89	48.7	87
									The sense of touch of carpet (flexibility)	◎	◎	○	◎	△	×	△	×
The outward appearance of carpet (reflecting feel)	◎	△	◎	△	◎	△	△	×

Notes) " PLLA " is meant that " poly-L-lactic acid " " N6 " is meant " nylon 6 " in the table.

(embodiment 7)

Except that the nylon 11 that uses intrinsic viscosity 1.45 as the composition B, operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of embodiment 7 is identical with embodiment 1, and is extremely stable.Cross section to the fiber that obtains carries out tem observation, obtains homodisperse island structure, and the area that exposes of PLA is 0.9% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.05 μ m～0.5 μ m with diameter.The section in this cross section of alkaline etching, PLA is removed in dissolving, observes, and finds that island component comes off, and confirms that thus PLA forms island component.

Further use this crimped yarn to make carpet evaluation, bulkiness is higher than embodiment 1, and for high-quality, and ABRASION RESISTANCE is also good.Sense of touch, outward appearance are all identical with embodiment 1, and be extremely good.

(embodiment 8)

Except that the NYLON610 (225 ℃ of fusing points) of using sulfuric acid relative viscosity 2.15 as the composition B, operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of embodiment 8 is identical with embodiment 1, and is extremely stable.Cross section to the fiber that obtains carries out tem observation, obtains homodisperse island structure, and the area that exposes of PLA is 1.2% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.03 μ m～0.3 μ m with diameter.The section in this cross section of alkaline etching, PLA is removed in dissolving, observes, and finds that island component comes off, and confirms that thus PLA forms island component.Further use this crimped yarn to make carpet evaluation, identical with embodiment 1, sense of touch, outward appearance are all good.

(embodiment 9)

Except that the N6/N66 copolymer nylon (198 ℃ of fusing points) that uses epsilon-caprolactams/adipic acid hexamethylene diamine salt (66 salt) to obtain with weight ratio 85/15 polymerization as the composition B, operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of embodiment 9 is identical with embodiment 1, and is extremely stable.Cross section to the fiber that obtains carries out tem observation, obtains homodisperse island structure, and the area that exposes of PLA is 1.4% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.03 μ m～0.26 μ m with diameter.The section in this cross section of alkaline etching, PLA is removed in dissolving, observes, and finds that island component comes off, and confirms that thus PLA forms island component.Further use this crimped yarn to make carpet evaluation, bulkiness is higher than embodiment 1.Sense of touch, outward appearance are all identical with embodiment 1, and be extremely good.

(embodiment 10)

Use contains the PLA P2 (polycarbodiimide " LA-1 ": 10 weight %) of phase solvation (composition C), mixing ratio is that P1/ composition B/P2=20/70/10 is (with respect to the concentration of the composition C of the total amount of composition A and composition B: 1.0 weight %), in addition, operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of embodiment 10 is identical with embodiment 1, and is extremely stable.Cross section to the fiber that obtains carries out tem observation, obtains homodisperse island structure, and the area that exposes of PLA is 1.1% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.03 μ m～0.3 μ m with diameter.Further use this crimped yarn to make carpet evaluation, ABRASION RESISTANCE is better than embodiment 1, and sense of touch, outward appearance are all identical with embodiment, extremely good simultaneously.

(comparative example 3)

Carry out the melt spinning except that spinning temperature being made as 270 ℃ (Tmb+45 ℃), operate in the same manner, obtain the BCF silk with embodiment 1.Need to prove that the melt viscosity of the composition A under this spinning temperature is 35Pas, the melt viscosity of composition B is 28Pas (η b/ η a=0.8).In the comparative example 3, because of Barus effect expands, discharging jet is unstable a little under spinning head.When carrying out the sampling of 100kg crimped yarn, broken string takes place 5 times, compare with embodiment 1, spinnability is poor slightly.Cross section to the fiber that obtains carries out tem observation, the local part that reverses of island structure or have the part coexistence of the common continuous structure that the island is formed by connecting.Intensity is 1.4cN/dtex, compares with embodiment 1, is about 1/2nd, represents that simultaneously the irregular U% of Wu Site of evenness fault is 2.2%, and is higher.When using this crimped yarn to make carpet to estimate, the wearing and tearing reduction rate is 76.5%, and extreme difference, reflecting feel are also poor than existing goods.

(comparative example 4)

Except that the Y shape hole that spinning head is become the wide 0.43mm of slit, the long 2.15mm of slit, hole depth 0.6mm, carry out spinning in the same manner with embodiment 3.Do not expand under the spinning head, but the refinement instability, can not spinning.Need to prove that the ejection linear velocity in the comparative example 4 in the spinneret hole is 0.0195m/ second.

(comparative example 5)

Identically with embodiment 3 except that the Y shape hole that spinning head is become the wide 0.09mm of slit, the long 0.45mm of slit, hole depth 0.6mm carry out spinning.Barus effect causes very big expansion under the spinning head in comparative example 5, therefore the pulsation phenomenon that refinement point changes up and down takes place, can not spinning.

Table 2

	Embodiment 7	Embodiment 8	Embodiment 9	Embodiment 10	Comparative example 3	Comparative example 4	Comparative example 5
								Composition A	PLLA	PLLA	PLLA	PLLA	PLLA	PLLA	PLLA
Weight average molecular weight	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand
								Fusing point (℃)	177	177	177	177	177	177	177
Residual lactide amount (weight %)	0.12	0.12	0.12	0.12	0.12	0.12	0.12
								Melt viscosity (Pas)	225	225	225	225	35	225	225
								Composition B	N11	N610	The N6/66 copolymerization	N6	N6	N6	N6
Relative viscosity (or intrinsic viscosity)	1.45	2.15	2.15	2.15	2.15	2.15	2.15
								Fusing point (℃)	186	225	198	225	225	225	225
Watery fusion heat (J/g)	76	78	63	78	78	78	78
								Melt viscosity (Pas)	89	63	61	58	28	58	58
								Composition C	-	-	-	LA-1	-	-	-
200 ℃ of hot reduction rates (%)	-	-	-	0.3	-	-	-
								Content (weight %)	-	-	-	1.0	-	-	-
								Blending ratio (composition A/ composition B%)	30/70	30/70	30/70	29.8/70.2	30/70	40/60	40/60
Melt viscosity is than (η b/ η a)	0.40	0.28	0.27	0.27	0.80	0.71	0.71
The rerum natura of fiber
								Island component	PLLA	PLLA	PLLA	PLLA	PLLA/N6	-	-
Sea component	N11	N610	The N6/66 copolymerization	N6	PLLA/N6	-	-
								Composition A exposes area ratio (%)	0.9	1.2	1.4	1.1	11.8	-	-
The farmland size of island component (μ m)	0.05～0.5	0.03～0.3	0.03～0.26	0.03～0.3	-	-	-
								The width of fiber top layer striated ditch (μ m)	0.26	0.23	0.25	0.24	0.46	-	-
The aspect ratio of fiber top layer strip ditch	21	22	22	19	15	-	-
								The quantity (individual) of fiber top layer striated ditch	5	8	8	8	2	-	-
Carboxyl terminal concentration (eq/ton)	18	18	18	5	63	-	-
								The degree of profile of silk cross section	2.7	2.5	2.6	2.7	1.5	-	-
Fiber number (dtex)	1500	1500	1500	1500	1500	-	-
								Intensity (cN/dtex)	2.5	2.2	2.4	2.7	1.4	-	-
Degree of stretching (%)	43	48	45	42	83	-	-
								U％(％)	0.8	0.8	1.0	1.0	2.2	-	-
Boiling water shrinkage (%)	2.2	3.3	4.0	3.7	2.3	-	-
								ABRASION RESISTANCE (broken string number of times)	95	89	85	132	14	-	-
Crimp extension rate (%)	21	10	15	12	4.4	-	-
								The restriction load is percentage elongation (%) down	4.5	3	4	3.5	1.5	-	-
								The rerum natura of fiber construct
The wearing and tearing reduction rate (%) of carpet	22.5	29.0	30.0	21.2	76.5	-	-
								The sense of touch of carpet (flexibility)	◎	◎	◎	◎	○	-	-
The outward appearance of carpet (reflecting feel)	◎	◎	◎	◎	×	-	-

Notes) in the table, " N11 " expression " nylon 11 ", " N610 " expression " NYLON610 ", " N6/66 copolymerization " expression " copolymer nylon of nylon 6 and nylon 66 "

(embodiment 11)

Except that the cooling wind speed with the ring-type path becomes 0.1m/ second, operate in the same manner with embodiment 1, obtain the BCF silk.Among the embodiment 11, under spinning head, Barus effect causes expansion, and slight pulsation phenomenon takes place.Therefore, broken string takes place in the sampling of 100kg 2 times.The crimped yarn intensity that obtains is 1.3cN/dtex, compares with embodiment 1, is about 1/2nd, represents that simultaneously the irregular U% of Wu Site of evenness fault is 3.3%, and is higher.When using this crimped yarn to make carpet to estimate, the wearing and tearing reduction rate is 46.8%, and poor slightly, sense of touch is also thick and stiff a little, but has a sample reflecting feel, and outward appearance is good.

(embodiment 12)

Making spray volume is 277g/ minute, with 2DR speed is to carry out the 2nd section stretching (stretching ratio: 1.15 times) in 2173m/ minute, and making coiling speed is 1847m/ minute (than the speed of 2DR speed low 15%), in addition, operate in the same manner with embodiment 1, obtain the BCF silk.The drawn yarn elongation at break that 2DR outlet sampling obtains is 76%.The crimped yarn intensity that obtains is 1.8cN/dtex, be about embodiment 1 intensity 64%, the expression evenness fault the irregular U% of Wu Site be 1.6%, high slightly.When using this crimped yarn to make carpet to estimate, the wearing and tearing reduction rate is 41.1%, and is poor slightly, is the level that can use in limited use.

(embodiment 13)

Except that the setting temperature with 2DR is set at 130 ℃, operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of embodiment 13 is identical with embodiment 1, and is extremely stable.Cross section to the fiber that obtains carries out tem observation, obtains homodisperse island structure, and the area that exposes of PLA is 1.5% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.03 μ m～0.3 μ m with diameter, and with embodiment 1 peer-level, but the fiber surface of this crimped yarn does not form the striated ditch basically.The crimp extension rate also is below half of embodiment 1.When using this crimped yarn to make carpet to estimate, have the sense of touch that is better than existing goods, but reflecting feel and existing goods are equal.

(embodiment 14)

Except that the setting temperature with 2DR is made as 110 ℃, operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of embodiment 14 is stable similarly to Example 1.The fiber crimp percentage elongation that obtains is 2.5%, and not too performance is curled.Boiling water shrinkage is 11.1%, and is higher, and DIMENSIONAL STABILITY is good not as embodiment 1.When using this crimped yarn to make carpet to estimate, sense of touch, reflecting feel are all equal with existing goods.

(embodiment 15)

Except that the circular hole that spinning head is become diameter 0.62mm, hole depth 1.0mm, operate in the same manner with embodiment 13, obtain the BCF silk.The spinnability of embodiment 15 is identical with embodiment 1, and is extremely stable.The cross section of the fiber that obtains is roughly circle (degree of profile 1.0), and cross section is carried out tem observation, and the result obtains homodisperse island structure, and the area that exposes of PLA is 1.7% with respect to the ratio of fiber surface area.Farmland, island size is scaled 0.03 μ m～0.3 μ m with diameter, with embodiment 1 peer-level.When using this crimped yarn to make carpet to estimate, have good similarly to Example 1 sense of touch, but reflecting feel is good not as embodiment 1.

(embodiment 16)

Except that utilizing the air flow jetting tamponade device to operate in the same manner with embodiment 1 heated compressed air handles carrying out under 150 ℃ of the nozzle temperatures, obtain the BCF silk.This crimped yarn crimp extension rate is 2.7%, and is lower, and not too performance is curled.When using this crimped yarn to make carpet to estimate, reflecting feel is good, but sense of touch is thick and stiff slightly.

Table 3

	Embodiment 11	Embodiment 12	Embodiment 13	Embodiment 14	Embodiment 15	Embodiment 16
							Composition A	PLLA	PLLA	PLLA	PLLA	PLLA	PLLA
Weight average molecular weight	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand
							Fusing point (℃)	177	177	177	177	177	177
Residual lactide amount (weight %)	0.12	0.12	0.12	0.12	0.12	0.12
							Melt viscosity (Pas)	225	225	225	225	225	225
							Composition B	N6	N6	N6	N6	N6	N6
Relative viscosity (or intrinsic viscosity)	2.15	2.15	2.15	2.15	2.15	2.15
							Fusing point (℃)	225	225	225	225	225	225
Watery fusion heat (J/g)	78	78	78	78	78	78
							Melt viscosity (Pas)	58	58	58	58	58	58
							Blending ratio (composition A/ composition B, %)	30/70	30/70	30/70	30/70	30/70	30/70
Melt viscosity is than (η b/ η a)	0.26	0.26	0.26	0.26	0.26	0.26
The rerum natura of fiber
							Island component	PLLA	PLLA	PLLA	PLLA	PLLA	PLLA
Sea component	N6	N6	N6	N6	N6	N6
							Composition A exposes area ratio (%)	1.6	1.5	1.5	1.5	1.7	1.5
The farmland size of island component (μ m)	0.05～0.7	0.04～0.4	0.03～0.3	0.03～0.3	0.03～0.3	0.03～0.3
							The width of fiber top layer striated ditch (μ m)	0.33	0.33	-	-	0.25	0.18
The aspect ratio of fiber top layer striated ditch	18	17	-	-	21	24
							The quantity (individual) of fiber top layer striated ditch	6	6	-	-	9	4
Carboxyl terminal concentration (eq/ton)	18	20	18	18	18	18
							The degree of profile of silk cross section	2.4	2.2	2.5	2.5	1.0	2.5
Fiber number (dtex)	1500	1500	1500	1500	1500	1500
							Intensity (cN/dtex)	1.3	1.8	2.9	3.2	2.8	2.8
Degree of stretching (%)	38	89	48	50	49	48
							U％(％)	3.3	1.6	0.7	0.6	0.5	0.8
Boiling water shrinkage (%)	2.7	1.7	8.5	11.1	2.5	4.7
							ABRASION RESISTANCE (broken string number of times)	36	72	108	118	106	128
Crimp extension rate (%)	8	5	4.5	2.5	9	2.7
							The restriction load is percentage elongation (%) down	2.5	1.5	1.5	1	3	1
							The rerum natura of fiber construct
The wearing and tearing reduction rate (%) of carpet	46.8	41.1	33.8	32.2	30.5	33.4
							The sense of touch of carpet (flexibility)	△	○	○	△	◎	△
The outward appearance of carpet (reflecting feel)	○	○	△	△	○	○

(embodiment 17)

With respect to PLA P1 (composition A), do talcum " the SG-2000 " (particle that average grain diameter D50:0.98 μ m, 10 μ m are above: 0 volume %) that mixes (dry blend) 1 weight % (is 0.3 weight % with respect to fabric integer) Japanese talcum (strain) society system, in addition, operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of embodiment 17 is identical with embodiment 1, and is extremely stable.This crimped yarn has and is about 1.4 times restriction load percentage elongation down with respect to embodiment 1, and the fastness height curls.

(embodiment 18)

With respect to PLA P1 (composition A), do melamine isocyanuric acid ester " the MC-600 " (particle that average grain diameter 1.6 μ m, 10 μ m are above: 0 volume %) that mixes 1 weight % (is 0.3 weight % with respect to fabric integer) daily output chemical industry (strain) society system, in addition, operate in the same manner with embodiment 1, obtain the BCF silk.The spinnability of embodiment 18 is identical with embodiment 1, and is extremely stable.This crimped yarn has and is about 1.8 times restriction load percentage elongation down with respect to embodiment 1, and the fastness of curling is high.

(embodiment 19)

With respect to nylon 6 (composition B), do and mix cupric iodide and each 0.03 weight % (being respectively 0.021 weight %) of KI with respect to fabric integer, in addition, operate in the same manner with embodiment 1, obtain the BCF silk.

The crimped yarn of the crimped yarn that obtains among the embodiment 1 and embodiment 19 is formed reeled yarn, use UV fadometer tun (auto the fadometer) (model: U48AU) carry out light fastness test under the following conditions, obtain strength retention of Suga testing machine (strain) system by the intensity before and after the light fastness test.As a result, the strength retention of the crimped yarn of embodiment 1 is 5%, and the strength retention of the crimped yarn of embodiment 19 is 91%, and light resistance is extremely good.

＜UV treatment conditions 〉

UV irradiation time: 100hrs

Black side plate temperature: 83 ℃

Temperature in jar: 64 ± 3 ℃

Humidity in jar: relative humidity is 50 ± 5% under the temperature in above-mentioned jar

Intensity (cN/dtex) * 100 before intensity (cN/dtex)/UV after strength retention (%)=UV handles handles

Table 4

	Embodiment 17	Embodiment 18	Embodiment 19
				Composition A	PLLA	PLLA	PLLA
Weight average molecular weight	23.3 ten thousand	23.3 ten thousand	23.3 ten thousand
				Fusing point (℃)	177	177	177
Residual lactide amount (weight %)	0.12	0.12	0.12
				Melt viscosity (Pas)	225	225	225
Crystallization nucleating agent	Talcum	Melamine cyanurate	-
				The addition of nucleator (weight %)	1	1	-
				Composition B	N6	N6	N6
Relative viscosity (or intrinsic viscosity)	2.15	2.15	2.15
				Fusing point (℃)	225	225	225
Watery fusion heat (J/g)	78	78	78
				Melt viscosity (Pas)	58	58	58
Photostabilizer	-	-	Cul/KI
				The addition of photostabilizer (weight %)	-	-	0.03/0.03
				Blending ratio (composition A/ composition B, %)	30/70	30/70	30/70
Melt viscosity is than (η b/ η a)	0.26	0.26	0.26
The rerum natura of fiber
				Island component	PLLA	PLLA	PLLA
Sea component	N6	N6	N6
				Composition A exposes area ratio (%)	1.6	1.6	1.5
The farmland size of island component (μ m)	0.03～0.3	0.03～0.3	0.03～0.3
				The width of fiber top layer striated ditch (μ m)	0.26	0.25	0.26
The aspect ratio of fiber top layer striated ditch	19	18	20
				The quantity (individual) of fiber top layer striated ditch	8	8	7
Carboxyl terminal concentration (eq/ton)	18	18	18
				The degree of profile of silk cross section	2.5	2.5	2.5
Fiber number (dtex)	1500	1500	1500
				Intensity (cN/dtex)	2.7	2.7	2.7
Degree of stretching (%)	45	46	47
				U％(％)	0.9	0.8	0.8
Boiling water shrinkage (%)	2.5	2.2	2.7
				ABRASION RESISTANCE (broken string number of times)	102	105	100
Crimp extension rate (%)	13	14	12
				The restriction load is percentage elongation (%) down	5	6.3	3.5
				The rerum natura of fiber construct
The wearing and tearing reduction rate (%) of carpet	23.2	22.1	26.0
				The sense of touch of carpet (flexibility)	◎	◎	◎
The outward appearance of carpet (reflecting feel)	◎	◎	◎

(embodiment 20)

Use spin-drawing continuous crisping applicator as shown in Figure 9 respectively core composition, sheath composition to be carried out melt spinning, stretching, heat treatment continuously, curl and handle, obtain the BCF silk with single shaft mixing roll.

In core composition hopper 21 shown in Figure 9, drop into composition A (P4), in sheath composition hopper 22, drop into composition B (the thermal capacity 79J/g at 225 ℃ of N6-1 fusing points, fusing point peak, relative viscosity 2.59, melt viscosity 150Pasec ^-1), utilize each single shaft to extrude mixing roll 23,24 and respectively composition A and composition B are carried out fusion and mixing, import spinning manifold 25, utilize gear pump 26,27 each polymer of metering, discharge, importing is present in the filament spinning component 28 of casing 25 inside, spins by having the spinning-nozzle 29 of 96 trilobal cross cross sections with pore.At this moment, the rotation number of the gear pump 26,27 of selected core composition, sheath composition makes the core sheath than=60/40 (weight ratio).Then, utilize single current cooling device 30 cooling curing strands 31, utilize oiling device 32 to oil.After further utilizing the 1st roller 33 to derive, the speed that makes the 2nd roller 34 is 1.02 times speed of the speed of the 1st roller 33, undrawn yarn is applied elongation, then, utilize the velocity ratio of the 2nd roller 34 and the 3rd roller 35 to stretch, implement heat treatment by the 3rd roller 35, utilize the speed of the 3rd roller 35 and the 4th roller 36 to stretch once more than implementing, carry out heat treatment once more by the 4th roller 36, between the 4th roller 36 and chill roll (drum cooler) 38, strand (overfeed) on one side relaxes, utilize on one side and use the curling nozzle 37 that adds hot fluid to give air flow jetting method stuffer box crimping, surface cool crimped yarn at chill roll (drum cooler) 38, fixed structure, at the 6th roller 39, apply the tension force (0.08cN/dtex that does not launch amount of crimp between the 7th roller 40, fiber number is used the fiber number of the crimped yarn that batches), utilizing the nozzle 47 that interweaves to give between the 7th roller 40 and coiling machine 42 interweaves, and apply the tension force (0.08cN/dtex that does not launch amount of crimp, fiber number is used the fiber number of the crimped yarn that batches) batch, carry out 1 section spinning thus, stretch, heat treatment, curl and handle, obtain the filamentary BCF silk of 1920dtex96 root (bobbin bag 41).About 100kg that takes a sample does not break, filament stream etc., and spinning is extremely stable.Embodiment 20 the results are shown in table 5.

Need to prove that melt spinning, stretching, heat treatment, the treatment conditions of curling are as described below.

Mixing roll temperature: 230 ℃

Spinning temperature: 245 ℃

Filtering layer: fill 30# inorganic oxide aluminium (morundum)

Filter: 20 μ m nonwoven fabric filters

Spinning head 2 (polymer is about to the spinning head before the ejection): the wide 0.15mm of slit, the long 1.5mm of slit, hole count 96

Spinning head 1 (the spinning head shown in 45 in the ideograph of Figure 12.Near spinning head 2 and before being present in it, core composition, sheath composition have stream separately):

Sheath composition aperture 0.5mm, the long 0.5mm of squit hole, be 3 at 1 filament hole count

Core composition slit width 0.12mm, slit length 1.2mm, be 1 at 1 filament hole count

Spray volume: 498.6g/ minute (1 assembly, 1 strand, 96 filaments)

Cooling: the single current that uses the long 1m of cooling.20 ℃ of cooling air temperature, wind speed 0.5m/ second, cooling starting position are 0.1m under the spinning head surface

Finish: it is 10% emulsus finish that silk is adhered to 10% fatty acid ester concentration

The 1st roll temperature: 25 ℃

The 2nd roll temperature: 70 ℃

The 3rd roll temperature: 135 ℃

The 4th roll temperature: 190 ℃

Chill-roll temperature: 25 ℃

The 6th roll temperature: 25 ℃

The 7th roll temperature: 25 ℃

Heating steam treatment temperature: 230 ℃

The 1st roller speed: 840m/ minute (=the 2 roller speed/1.02)

The 2nd roller speed: 857m/ minute

The 3rd roller speed: 2400m/ minute

The 4th roller speed: 3000m/ minute

Chill roll speed: 80m/ minute

The 6th roller speed: 2550m/ minute

The 7th roller speed: 2600m/ minute

Coiling speed: 2550m/ minute

Comprehensive stretching ratio: 3.5 times of (the 2nd～the 3rd rollers: the 2.8 times, the 3rd～the 4th roller: 1.25 times).

Compressed air interweaves: 0.2MPa

In the BCF silk that obtains, filament is looped-shaped bending on irregular direction, forms to curl, and has the wrapped configuration that filament twines mutually.Intensity is 2.3cN/dtex, boil receive be 2.2%, the filament fiber number is 20dtex.The crimp extension rate is 25%, the restriction load down percentage elongation be 13%, shows good curl characteristics, be the curling crimped yarn that is difficult to untie.When using this crimped yarn to make braiding grey tube cloth, carpet, all have sense of fullness, and have soft sense of touch, present the gloss with taste, feel is good.

The braiding grey tube cloth that is made of the crimped yarn that obtains is carried out anti-fissility evaluation, and appearance change does not take place in result fully, has good anti-fissility.The carpet that the crimped yarn that use is obtained forms carries out wear-resistant test, the result, and the wearing and tearing reduction rate is 10%, has good ABRASION RESISTANCE, albefaction and sheath that the carpet after the wearing and tearing is not observed crimped yarn split.

Filament cross section to the crimped yarn that obtains carries out tem observation, and the core composition is positioned at filamentary center as a result, and the minimum of a value of sheath composition thickness is 3.0 μ m, and the core composition all is covered by the sheath composition.The area that exposes that is PLA is 0% with respect to the ratio of fiber surface area.Filamentary degree of profile is 3.0, the degree of profile of core composition is 3.0.Can be observed fusing point and be 169 ℃ (coming from the peak of composition A) and 224 ℃ (coming from the peak of composition B) in the DSC of the crimped yarn that obtains and result from the melting hump of each composition, the summation of the thermal capacity of each melting hump is 72J/g, has sufficient crystallinity.

(comparative example 6)

In embodiment 20, do not use composition B, and change spinning head, in addition, utilize the condition identical with embodiment 20, attempt obtaining the BCF silk that only constitutes, but the filament heat bonding is serious in the 4th roller 36, curling nozzle 37 by composition A, can not spinning.So, change the temperature of temperature, the 4th roller 36 of the 3rd roller 35, the temperature of the nozzle 37 that curls, (speed, the speed of the 7th roller 40, the coiling speed that change the 6th roller 39 this moment make tension force in the scope shown in the embodiment 20 to obtain the crimped yarn of comparative example 6.Adjust spray volume, making the filament fiber number is 20dtex).Spinnability is bad, in the sampling of 100kg, broken string takes place 15 times.Comparative example 6 the results are shown in table 5, temperature, the speed of the 6th roller 39, the speed of the 7th roller 40, the coiling speed of the temperature of the specification of the spinning head of comparative example 6, the 3rd roller 35, the temperature of the 4th roller 36, the nozzle 37 that curls are as follows.

The spinning head 2 of comparative example 6: core composition slit width 0.12mm, the long 1.2mm of slit, be 1 (stream of no sheath composition) with respect to 1 filament hole count

The 3rd roll temperature of comparative example 6: 90 ℃

The 4th roll temperature of comparative example 6: 110 ℃

The curling nozzle temperature of comparative example 6: 150 ℃

The 6th roller speed: 2650m/ minute

The 7th roller speed: 2660m/ minute

The coiling speed of comparative example 6: 2670m/ minute

By embodiment 20 and comparative example 6 as can be known, crimped yarn of the present invention is by having the sheath composition, can form ABRASION RESISTANCE, crimped yarn that curl characteristics is good.Comparative example 6 is not owing to have the sheath composition, thus in anti-fissility test, do not observe the phenomenon of peeling off at core sheath interface, but fragmentary visible crimped yarn comes off, fibrillation, all can be observed the vacancy part in all tests.The fragmentary visible heat bonding part of the crimped yarn of comparative example 6, intensity is 1.2cN/dtex, and is lower, in the operation of making braiding grey tube cloth, carpet, broken string takes place frequently.The high strand of the residual degree of orientation in the crimped yarn boils and receives up to 10%, so, the anti-fissility of this crimped yarn, ABRASION RESISTANCE, curl characteristics through the time worsen.

(embodiment 21～22, comparative example 7～8)

In embodiment 20, except that the temperature that changes the 4th roller 36, operate in the same manner with embodiment 20, obtain the crimped yarn (at this moment, speed, the speed of the 7th roller 40, the coiling speed with the 6th roller 39 is adjusted to the tension force shown in the embodiment 20) of embodiment 21～22, comparative example 7～8.Broken string respectively takes place 1 time in embodiment 21,22, is not the level that causes problem.The spinnability of comparative example 7,8 is bad, and broken string takes place in the comparative example 7 11 times, and broken string takes place in the comparative example 8 13 times.

Embodiment 21～22, comparative example 7～8 the results are shown in table 5.The spinning condition of embodiment 21～22, comparative example 7～8 is as follows.

The 4th roll temperature

Embodiment 21:160 ℃

Embodiment 22:220 ℃

Comparative example 7:150 ℃

Comparative example 8:225 ℃

Comparing embodiment 20～22, comparative example 7～8 are as can be known, adopt 160～220 ℃ by the heat treatment temperature that makes the final roller after the stretching, the crimped yarn that has preferred intensity of the present invention, boils and receive can be formed, and the good crimped yarn of anti-fissility can be obtained with good productivity ratio.The inventor thinks, this is because above-mentionedly preferably create conditions by adopting, can work in coordination with fiber in the effect that makes the fusion of core component portion on the final roller of performance after stretching and the curling nozzle and be in the effect of the condition of high temperature immediately, under the situation of the influence of the heat shrinkability characteristic difference that is not subjected to core composition and sheath composition, in core composition and sheath composition, form crystalline phase and irregular amorphous phase two phase structures.Need to prove, the heat treatment of the final roller of crimped yarn warp of comparative example 8, the fusion of sheath component portion, cross sectional shape takes place chaotic, causes a part of attenuation of sheath composition.

Comparing embodiment 20～22 by adopting among the present invention more preferably manufacture method, has formed the also good crimped yarn of curl characteristics as can be known.This is to compare with embodiment 21～22 because of braiding grey tube cloth, carpet that the crimped yarn by embodiment 20 constitutes, has good feel.

Table 5

Project		Embodiment	20	Comparative example 6	Embodiment 21	Embodiment 22	Comparative example 7	Comparative example 8
									Composition A	-	P4	P4	P4	P4	P4	P4
The fusing point of composition A (Tma)	℃	170	170	170	170	170	170
								(η a) for the melt viscosity of composition A	Pa·sec -1	200	200	200	200	200	200
Composition B	-	N6-1	-	N6-1	N6-1	N6-1	N6-1
								The fusing point of composition B (Tmb)	℃	225	-	225	225	225	225
The melt viscosity of composition B (η b)	Pa·sec -1	150	-	150	150	150	150
								The melt viscosity of composition A and composition B is than (η b/ η a)	-	0.75	-	0.75	0.75	0.75	0.75
The core sheath is than (core composition/sheath composition)	-	40/60	100/0	40/60	40/60	40/60	40/60
								The content of composition A	Weight %	40	100	40	40	40	40
The ejection linear velocity	m/min	7.3	7.3	7.5	6.9	7.7	6.7
								Spinning temperature	℃	245	245	245	245	245	245
Comprehensive stretching ratio	-	3.5	3.5	3.5	3.5	3.5	3.5
								The 2nd roll temperature	℃	70	70	70	70	70	70
The 3rd roll temperature	℃	135	90	135	135	135	135
								The 4th roll temperature	℃	190	110	160	220	150	225
Nozzle temperature curls	℃	230	150	230	230	230	230
								The 4th roller speed	m/min	3000	3000	3000	3000	3000	3000
Coiling speed	m/min	2550	2670	2620	2420	2690	2350
								(1-coiling speed/the 4th roller speed) * 100	％	15.0	11.0	12.7	19.3	10.3	21.7
Intensity	cN/dtex	2.3	1.2	2.9	1.7	3.6	1.3
								Degree of stretching	％	45	45	45	45	45	20
Boiling water shrinkage	％	2.2	10	5.3	1.7	9.2	1.1
								The filament fiber number	dtex	20	20	20	20	20	20
Filamentary degree of profile	-	3.0	3.0	3.0	3.0	3.0	3.0
								The degree of profile of core composition	-	3.0	3.0	3.0	3.0	3.0	3.0
U% (normal state)	-	1.2	2.5	1.3	1.4	2	19
								Crimp extension rate after the boiling water treating	％	25	4	8	33	4	36
The restriction load is curling percentage elongation down	％	13	1	4	20	2	18
								The CF value	-	13	13	13	13	13	13
The minimum of a value of sheath composition thickness	μm	3.0	0	3.0	2.0	3.0	0.9
								The thermal capacity summation of fiber melting hump	J/g	72	46	72	72	72	72
Spinnability	◎～×	◎	×	◎	◎	○	×
								The wearing and tearing reduction rate	Weight %	10	72	19	19	33	34
Anti-fissility	◎～×	◎ 24	× 5	○ 18	○ 20	× 10	× 10
								Bulkiness	◎～×	◎	×	○	◎	×	○
Flexibility	◎～×	◎	×	○	◎	×	△

(embodiment 23～24, comparative example 9～10)

In embodiment 20, except that changing comprehensive stretching ratio, operate in the same manner with embodiment 20, obtain the crimped yarn (speed of the 1st～3 roller is become following multiplying power, and the speed of the 1st roller 33 is the values that obtain with 1.02 speed of removing the 2nd roller 34) of embodiment 23～24, comparative example 9～10.Broken string respectively takes place among the embodiment 23～24 1 time, is not the level that causes problem.The spinnability of comparative example 9～10 is bad, can be observed broken string takes place in the comparative example 9 12 times, and broken string takes place in the comparative example 10 14 times.Embodiment 23～24, comparative example 9～10 the results are shown in table 6.The spinning condition of embodiment 23～24, comparison 9～10 is as follows.

Comprehensive stretching ratio

Embodiment 23:2.1 is (the 2nd～the 3rd roller: the 1.68 times, the 3rd～the 4th roller: 1.25 times) doubly

Embodiment 24:4.9 is (the 2nd～the 3rd roller: the 3.92 times, the 3rd～the 4th roller: 1.25 times) doubly

Comparative example 9:1.9 is (the 2nd～the 3rd roller: the 1.52 times, the 3rd～the 4th roller: 1.25 times) doubly

Comparative example 10:5.1 is (the 2nd～the 3rd roller: the 4.08 times, the 3rd～the 4th roller: 1.25 times) doubly

Comparing embodiment 20,23～24, comparative example 9～10 by adopting 2～5 times of comprehensive stretching ratios, can form crimped yarn of the present invention, and can form the good crimped yarn of anti-fissility as can be known.By stretching, spinning speed can be controlled at suitable scope, and the core composition of drawn yarn and sheath composition evenly are orientated with above-mentioned comprehensive stretching ratio.Therefore, in the processing of curling, the heat shrinkability characteristic that is difficult to produce core composition and sheath composition is poor, with the strand of core sheath interface adjacency excessive deformation does not take place.And embodiment 20 compares with embodiment 23～24, has better fibre structure (intensity, the receipts of boiling), so be the also good crimped yarn of anti-fissility.

Table 6

Project		Embodiment	23	Embodiment 24	Comparative example 9	Comparative example 10
							Composition A	-	P4	P4	P4	P4
The fusing point of composition A (Tma)	℃	170	170	170	170
						(η a) for the melt viscosity of composition A	Pa·sec -1	200	200	200	200
Composition B	-	N6-1	N6-1	N6-1	N6-1
						The fusing point of composition B (Tmb)	℃	225	225	225	225
The melt viscosity of composition B (η b)	Pa·sec -1	150	150	150	150
						The melt viscosity of composition A and composition B is than (η b/ η a)	-	0.75	0.75	0.75	0.75
The core sheath is than (core composition/sheath composition)	-	40/60	40/60	40/60	40/60
						The content of composition A	Weight %	40	40	40	40
The ejection linear velocity	m/min	7.3	7.3	7.3	7.3
						Spinning temperature	℃	245	245	245	245
Comprehensive stretching ratio	-	2.1	4.9	1.9	5.1
						The 2nd roll temperature	℃	70	70	70	70
The 3rd roll temperature	℃	135	135	135	135
						The 4th roll temperature	℃	190	190	190	190
Nozzle temperature curls	℃	230	230	230	230
						The 4th roller speed	m/min	3000	3000	3000	3000
Coiling speed	m/min	2550	2550	2550	2550
						(1-coiling speed/the 4th roller speed) * 100	％	15.0	15.0	15.0	15.0
Intensity	cN/dtex	1.6	3.4	1.3	3.7
						Degree of stretching	％	55	20	60	15
Boiling water shrinkage	％	1.3	5.4	2	6
						The filament fiber number	dtex	20	20	20	20
Filamentary degree of profile	-	3.0	3.0	3.0	3.0
						The degree of profile of core composition	-	3.0	3.0	3.0	3.0
U% (normal state)	-	1.5	1.8	2.6	2.5
						Crimp extension rate after the boiling water treating	％	25	25	25	25
The restriction load is curling percentage elongation down	％	13	13	6	7
						The minimum of a value of sheath composition thickness	μm	3.0	3.0	3.0	3.0
The CF value	-	13	13	13	13
						The thermal capacity summation of fiber melting hump	J/g	72	72	72	72
Spinnability	◎～×	◎	◎	×	×
						The wearing and tearing reduction rate	Weight %	13	14	36	34
Anti-fissility	◎～×	○ 20	○ 18	× 9	× 9
						Bulkiness	◎～×	◎	◎	○	○
Flexibility	◎～×	◎	◎	△	△

(embodiment 25～27, comparative example 11～12)

In embodiment 20, except that the hole count that changes spinning head, operate in the same manner, obtain the crimped yarn of embodiment 25～27, comparative example 11～12 with embodiment 20.Broken string takes place 1 time in embodiment 25, embodiment 26, is the level that does not cause problem.The spinnability of comparative example 11～12 is bad, and broken string takes place in the comparative example 11 11 times, and broken string takes place in the comparative example 12 12 times.Embodiment 25～27, comparative example 11～12 the results are shown in table 7.The spinning condition of embodiment 25～27, comparison 11～12 is as follows.

The spinning head hole count

Embodiment 25:320

Embodiment 26:72

Embodiment 27:50

Comparative example 11:480

Comparative example 12:45.

Comparing embodiment 20,25～27, comparative example 11～12 by forming the crimped yarn of the preferred filament fiber number of the present invention, can obtain the good crimped yarn of anti-fissility as can be known.This is because be below the 40dtex by making the filament fiber number, can be in the manufacturing procedure of curling heating core composition and sheath composition rapidly, and be not subjected at core sheath interface forming crystalline phase and irregular amorphous phase two phase structures under the situation of excessive deformation.In addition, be more than the 5dtex by making the filament fiber number, can avoid extending because of the tension force that applies thereon at the processing back crimped yarn that curls, the harmful effect that deforms at core sheath interface, and can improve anti-fissility.Relatively braiding grey tube cloth that constitutes by the crimped yarn of embodiment 25,27 and carpet as can be known, the braiding grey tube cloth and the carpet sense of fullness that are made of embodiment 20 are good, can the long term maintenance sense of fullness.That is, making the filament fiber number by formation is the crimped yarn of 5～40dtex, can access the also high crimped yarn of firmness that curls.

Table 7

Project		Embodiment	25	Embodiment 26	Embodiment 27	Comparative example 11	Comparative example 12
								Composition A	-	P4	P4	P4	P4	P4
The fusing point of composition A (Tma)	℃	170	170	170	170	170
							(η a) for the melt viscosity of composition A	Pa·sec -1	200	200	200	200	200
Composition B	-	N6-1	N6-1	N6-1	N6-1	N6-1
							The fusing point of composition B (Tmb)	℃	225	225	225	225	225
The melt viscosity of composition B (η b)	Pa·sec -1	150	150	150	150	150
							The melt viscosity of composition A and composition B is than (η b/ η a)	-	0.75	0.75	0.75	0.75	0.75
The core sheath is than (core composition/sheath composition)	-	40/60	40/60	40/60	40/60	40/60
							The content of composition A	Weight %	40	40	40	40	40
The ejection linear velocity	m/min	2.2	9.8	14.1	1.5	15.6
							Spinning temperature	℃	245	245	245	245	245
Comprehensive stretching ratio	-	3.5	3.5	3.5	3.5	3.5
							The 2nd roll temperature	℃	70	70	70	70	70
The 3rd roll temperature	℃	135	135	135	135	135
							The 4th roll temperature	℃	190	190	190	190	190
Nozzle temperature curls	℃	230	230	230	230	230
							The 4th roller speed	m/min	3000	3000	3000	3000	3000
Coiling speed	m/min	2550	2550	2550	2550	2550
							(1-coiling speed/the 4th roller speed) * 100	％	15.0	15.0	15.0	15.0	15.0
Intensity	cN/dtex	2.2	2.1	2.2	1.7	2.5
							Degree of stretching	％	45	45	45	45	45
Boiling water shrinkage	％	5.1	4.4	4.8	8.3	9.1
							The filament fiber number	dtex	6	26.7	38.4	4	42.7
Filamentary degree of profile	-	3.0	3.0	3.0	3.0	3.0
							The degree of profile of core composition	-	3.0	3.0	3.0	3.0	3.0
U% (normal state)	-	1.4	1.4	1.4	8.3	8.1
							Crimp extension rate after the boiling water treating	％	20	25	22	14	20
The restriction load is curling percentage elongation down	％	7	9	6	2	4
							The minimum of a value of sheath composition thickness	μm	1.6	3.4	9.1	1.3	9.4
The CF value	-	13	13	13	13	13
							The thermal capacity summation of fiber melting hump	J/g	70	70	69	68	62
Spinnability	◎～×	○	○	○	-	-
							The wearing and tearing reduction rate	Weight %	19	13	18	32	35
Anti-fissility	◎～×	○ 16	○ 20	○ 17	× 8	× 9
							Bulkiness	◎～×	○	○	○	△	○
Flexibility	◎～×	○	○	△	○	×

(embodiment 28～31)

In embodiment 20, except that changing, operate in the same manner with embodiment 20 as the resin of composition A, composition B, obtain the crimped yarn of embodiment 28～ 31.In embodiment 28,29, do not find broken string.Broken string respectively takes place in embodiment 30,31 1 time, is the level that does not cause problem.Embodiment 28～29 the results are shown in table 8.The resin that uses among the embodiment 28～31 is as follows.

Resin as core composition, sheath composition

Embodiment 28: composition A=P4, composition B=N6-2 (the thermal capacity 77J/g at 225 ℃ of fusing points, fusing point peak, relative viscosity 2.95, melt viscosity 300Pasec ^-1)

Embodiment 29: composition A=P4, composition B=N6-3 (the thermal capacity 78J/g at 225 ℃ of fusing points, fusing point peak, relative viscosity 2.10, melt viscosity 50Pasec ^-1)

Embodiment 30: composition A=P5, composition B=N6-3

Embodiment 31: composition A=P6, composition B=N6-2

Comparing embodiment 20,28～31 as can be known, the melt viscosity by making the composition A that uses among the present invention and composition B can form the good crimped yarn of anti-fissility than in preferred range of the present invention.By adopting the preferred melt viscosity ratio of the present invention, can be to core composition and the even stress application of sheath composition in the melt spinning operation, because the core composition of undrawn yarn and the molecularly oriented of sheath composition not there are differences basically, so can evenly be orientated at stretching process SMIS composition and sheath composition, and heat shrinkability characteristic poor of each composition in the processing that reduces to curl, thereby make the strand with core sheath interface adjacency be difficult to be subjected to excessive deformation.

Braiding grey tube cloth that constitutes with crimped yarn by embodiment 28～31 and carpet are more as can be known, and be good by braiding grey tube cloth and the anti-fissility of carpet that embodiment 20 constitutes.In addition, sheath does not take place split and cause the core composition to expose, ABRASION RESISTANCE is also good as can be known.

Table 8

Project		Embodiment	28	Embodiment 29	Embodiment 30	Embodiment 31
							Composition A	-	P4	P4	P5	P6
The fusing point of composition A (Tma)	℃	170	170	170	170
						(η a) for the melt viscosity of composition A	Pa·sec -1	200	200	300	120
Composition B	-	N6-2	N6-3	N6-3	N6-2
						The fusing point of composition B (Tmb)	℃	225	225	225	225
The melt viscosity of composition B (η b)	Pa·sec -1	300	50	50	300
						The melt viscosity of composition A and composition B is than (η b/ η a)	-	1.50	0.25	0.17	2.50
The core sheath is than (core composition/sheath composition)	-	40/60	40/60	40/60	40/60
						The content of composition A	Weight %	40	40	40	40
The ejection linear velocity	m/min	7.3	7.3	7.3	7.3
						Spinning temperature	℃	245	245	245	245
Comprehensive stretching ratio	-	3.5	3.5	3.5	3.5
						The 2nd roll temperature	℃	70	70	70	70
The 3rd roll temperature	℃	135	135	135	135
						The 4th roll temperature	℃	190	190	190	190
Nozzle temperature curls	℃	230	230	230	230
						The 4th roller speed	m/min	3000	3000	3000	3000
Coiling speed	m/min	2550	2550	2550	2550
						(1-coiling speed/the 4th roller speed) * 100	％	15.0	15.0	15.0	15.0
Intensity	cN/dtex	3.2	1.6	1.6	3.2
						Degree of stretching	％	45	45	45	45
Boiling water shrinkage	％	4.6	4.8	5.6	5.8
						The filament fiber number	dtex	20	20	20	20
Filamentary degree of profile	-	3.0	3.0	3.0	3.0
						The degree of profile of core composition	-	3.0	3.0	3.0	3.0
U% (normal state)	-	1.2	1.2	1.2	1.2
						Crimp extension rate after the boiling water treating	％	25	25	25	25
The restriction load is curling percentage elongation down	％	11	9	9	3
						The minimum of a value of sheath composition thickness	μm	2.7	3.0	2.3	0.3
The CF value	-	13	13	13	13
						The thermal capacity summation of fiber melting hump	J/g	74	70	72	70
Spinnability	◎～×	◎	◎	○	○
						The wearing and tearing reduction rate	Weight %	15	17	24	26
Anti-fissility	◎～×	○ 21	○ 18	△ 15	△ 15
						Bulkiness	◎～×	◎	○	○	△
Flexibility	◎～×	◎	○	△	△

(embodiment 32～36)

In embodiment 20, except that changing the core sheath, operate in the same manner with embodiment 20 than (weight ratio), obtain the crimped yarn of embodiment 32～36.Embodiment 32～36 the results are shown in table 5, and the core sheath among each embodiment is such as shown in down.

Embodiment 32: core composition/sheath composition=20/80

Embodiment 33: core composition/sheath composition=30/70

Embodiment 34: core composition/sheath composition=60/40

Embodiment 35: core composition/sheath composition=70/30

Embodiment 36: core composition/sheath composition=80/20.

By embodiment 20,32～36 as can be known, by adopting the preferred core sheath ratio of the present invention, can access the better crimped yarn of anti-fissility.This is because by adopting preferred core sheath ratio, can increase the area at the core sheath interface of per unit volume core composition.And, owing to can suppress peeling off of core sheath interface, so the core composition does not expose and causes coming off when not wearing and tearing, so be the better crimped yarn of ABRASION RESISTANCE.And the crimped yarn of embodiment 20 is compared with embodiment 32～36, has high anti-fissility, firmness, and can long term maintenance bulkiness, flexibility.

Table 9

Project		Embodiment	32	Embodiment 33	Embodiment 34	Embodiment 35	Embodiment 36
								Composition A	-	P4	P4	P4	P4	P4
The fusing point of composition A (Tma)	℃	170	170	170	170	170
							(η a) for the melt viscosity of composition A	Pa·sec -1	200	200	200	200	200
Composition B	-	N6-1	N6-1	N6-1	N6-1	N6-1
							The fusing point of composition B (Tmb)	℃	225	225	225	225	225
The melt viscosity of composition B (η b)	Pa·sec -1	150	150	150	150	150
							The melt viscosity of composition A and composition B is than (η b/ η a)	-	0.75	0.75	0.75	0.75	0.75
The core sheath is than (core composition/sheath composition)	-	20/80	30/70	60/40	70/30	80/20
							The content of composition A	Weight %	20	30	60	70	80
The ejection linear velocity	m/min	7.4	7.4	7.2	7.2	7.1
							Spinning temperature	℃	245	245	245	245	245
Comprehensive stretching ratio	-	3.5	3.5	3.5	3.5	3.5
							The 2nd roll temperature	℃	70	70	70	70	70
The 3rd roll temperature	℃	135	135	135	135	135
							The 4th roll temperature	℃	190	190	190	190	190
Nozzle temperature curls	℃	230	230	230	230	230
							The 4th roller speed	m/min	3000	3000	3000	3000	3000
Coiling speed	m/min	2550	2550	2550	2550	2550
							(1-coiling speed/the 4th roller speed) * 100	％	15.0	15.0	15.0	15.0	15.0
Intensity	cN/dtex	2.4	2.3	2	1.8	1.6
							Degree of stretching	％	45	45	45	45	45
Boiling water shrinkage	％	2.1	2.1	2.8	4.8	5.5
							The filament fiber number	dtex	20	20	20	20	20
Filamentary degree of profile	-	3.0	3.0	3.0	3.0	3.0
							The degree of profile of core composition	-	3.0	3.0	3.0	3.0	3.0
U% (normal state)	-	1.1	1.1	1.4	1.3	1.3
							Crimp extension rate after the boiling water treating	％	25	25	25	25	25
The restriction load is curling percentage elongation down	％	14	14	10	6	4
							The minimum of a value of sheath composition thickness	μm	4.4	3.8	1.8	1.3	0.9
The CF value	-	13	13	13	13	13
							The thermal capacity summation of fiber melting hump	J/g	77	75	62	58	51
Spinnability	◎～×	◎	◎	◎	◎	○
							The wearing and tearing reduction rate	Weight %	9	9	13	20	28
Anti-fissility	◎～×	◎ 25	◎ 24	◎ 23	○ 20	△ 14
							Bulkiness	◎～×	◎	◎	◎	○	△
Flexibility	◎～×	◎	◎	◎	△	△

(embodiment 37～41)

In embodiment 20, except that the degree of profile that changes spinning head, filamentary degree of profile and core composition, operate in the same manner with embodiment 20, obtain the BCF silk of embodiment 36～41.Embodiment 37～41 the results are shown in table 10, and the spinning head specification among each embodiment is as follows.

The spinning head 2 of embodiment 37: slit width 0.3mm, the long 1.5mm of slit, hole count 96

The spinning head 1 of embodiment 37:

Sheath composition aperture 0.5mm, the long 0.5mm of squit hole, be 3 with respect to 1 filament hole count

Core composition slit width 0.12mm, the long 0.6mm of slit, be 1 with respect to 1 filament hole count

The spinning head 2 of embodiment 38: slit width 0.15mm, the long 2.25mm of slit, hole count 96

The spinning head 1 of embodiment 38:

Sheath composition aperture 0.5mm, the long 0.5mm of squit hole, be 3 with respect to 1 filament hole count

Core composition slit width 0.12mm, the long 1.8mm of slit, be 1 with respect to 1 filament hole count

The spinning head 2 of embodiment 39: slit width 0.25mm, the long 0.75mm of slit, hole count 96

The spinning head 1 of embodiment 39:

Sheath composition aperture 0.5mm, the long 0.5mm of squit hole, be 3 with respect to 1 filament hole count

Core composition slit width 0.12mm, the long 0.48mm of slit, be 1 with respect to 1 filament hole count

The spinning head 2 of embodiment 40: slit width 0.15mm, the long 2.70mm of slit, hole count 96

The spinning head 1 of embodiment 40:

Sheath composition aperture 0.5mm, the long 0.5mm of squit hole, be 3 with respect to 1 filament hole count

Core composition slit width 0.12mm, the long 2.16mm of slit, be 1 with respect to 1 filament hole count.

The spinning head 2 of embodiment 41: spinning head aperture 0.6mm, the long 0.6mm of squit hole, hole count 96

The spinning head 1 of embodiment 41:

Sheath composition aperture 0.5mm, the long 0.5mm of squit hole, be 3 with respect to 1 filament hole count

Core composition aperture 0.6mm, the long 0.6mm of squit hole, be 1 with respect to 1 filament hole count.

By embodiment 20,37～41 as can be known, by making filamentary degree of profile height, can in the nozzle that curls, heat filament equably, make 2 polarization that crystalline phase and irregular amorphous phase take place in core composition and sheath composition two compositions easily, in addition, owing to also increased the bond area of core composition and sheath composition, so form the good crimped yarn of anti-fissility.

With embodiment 38,40 more as can be known, the high abrasion resistance of embodiment 20,37,39,41.Promptly, by making filamentary degree of profile in preferred range of the present invention, can make the evenly lining (minimum of a value of the thickness of sheath composition is big) easily of sheath composition, and because filamentary cross section does not have excessive acute angle part, so form the crimped yarn of anti-fissility, high abrasion resistance.

(embodiment 42～44)

In embodiment 36, be supplied in the section of core composition hopper except that changing, operate in the same manner with embodiment 36, obtain the BCF silk of embodiment 42～44.Embodiment 42～44 the results are shown in table 11, and the section that is supplied in the core composition hopper among each embodiment is as follows.

The section of the core composition of embodiment 42: with P4/P8=90/10 (weight ratio) mixing of cutting into slices

The section of the core composition of embodiment 43: with P4/P9=90/10 (weight ratio) mixing of cutting into slices

The section of the core composition of embodiment 44: with P4/P10=90/10 (weight ratio) mixing of cutting into slices.

By embodiment 36,42～44 as can be known, contain composition C (phase solvation), can improve the cementability at core sheath interface, obtain the crimped yarn of anti-fissility, high abrasion resistance by making crimped yarn.

(embodiment 45)

In embodiment 36, be supplied in the section of sheath composition hopper, operate in the same manner, obtain the BCF silk of embodiment 45 with embodiment 36 except that changing.Embodiment 45 the results are shown in table 11, and the section that is supplied in sheath composition hopper is as follows.

The section of the sheath composition of embodiment 45: with N6-1/N6-4=80/20 (weight ratio) mixing of cutting into slices

N6-4: with N6-1 and lubricant (Japanese grease (strain) system, the goods name Alflow H-50L (ethylenebisstearamide of drying, hereinafter referred to as EBA) with N6-1: EBA=90: 10 (weight ratios) are supplied in the twin shaft mixing extruder, mixing down 220 ℃ of sleeve temperature, obtain containing the nylon 6 of 10 weight %EBA.The fusing point of this polymer is that 225 ℃, the thermal capacity of melting hump are that 81J/g, relative viscosity are 2.59, melt viscosity is 150Pasec ^-1

By embodiment 36,45 as can be known, contain EBA (lubricant), can increase the flatness of fiber surface, make external force be difficult to be delivered to fiber thus, obtain the crimped yarn of anti-fissility, high abrasion resistance by making crimped yarn.

Table 11

Project		Embodiment	42	Embodiment 43	Embodiment 44	Embodiment 45
							Composition A	-	P4/P8 mixes	P4/P9 mixes	P4/P10 mixes	P4
The fusing point of composition A (Tma)	℃	170	170	170	170
						(η a) for the melt viscosity of composition A	Pa·sec -1	200	200	200	200
Composition B	-	N6-1	N6-1	N6-1	N6-1/N6-4 mixes
						The fusing point of composition B (Tmb)	℃	225	225	225	225
The melt viscosity of composition B (η b)	Pa·sec -1	150	150	150	150
						Composition C	-	LA-1	MADGIC	Modiper	-
The content of composition C	Weight %	0.8	0.8	1.6	-
						Lubricant	-	-	-	-	EBA
The content of lubricant	Weight %	-	-	-	0.2
						The melt viscosity of composition A and composition B is than (η b/ η a)	-	0.75	0.75	0.75	0.75
The core sheath is than (core composition/sheath composition)	-	80/20	80/20	80/20	80/20
						The content of composition A	Weight %	79.2	79.2	78.4	79.2
The ejection linear velocity	m/min	7.1	7.1	7.1	7.1
						Spinning temperature	℃	245	245	245	245
Comprehensive stretching ratio	-	3.5	3.5	3.5	3.5
						The 2nd roll temperature	℃	70	70	70	70
The 3rd roll temperature	℃	135	135	135	135
						The 4th roll temperature	℃	190	190	190	190
Nozzle temperature curls	℃	230	230	230	230
						The 4th roller speed	m/min	3000	3000	3000	3000
Coiling speed	m/min	2550	2550	2550	2550
						(1-coiling speed/the 4th roller speed) * 100	％	15	15	15	15
Intensity	cN/dtex	1.7	1.7	1.6	1.6
						Degree of stretching	％	45	45	45	45
Boiling water shrinkage	％	2.1	2.1	2	2
						The filament fiber number	dtex	20	20	20	20
Filamentary degree of profile	-	3.0	3.0	3.0	3.0
						The degree of profile of core composition	-	3.0	3.0	3.0	3.0
U% (normal state)	-	1.3	1.3	1.3	1.3
						Crimp extension rate after the boiling water treating	％	25	25	25	25
The restriction load is curling percentage elongation down	％	4	4	4	6
						The minimum of a value of sheath composition thickness	μm	0.9	0.9	0.9	0.9
The CF value	-	13	13	13	13
						The thermal capacity summation of fiber melting hump	J/g	51	51	51	54
Spinnability	◎～×	◎	◎	◎	◎
						The wearing and tearing reduction rate	Weight %	16	16	15	15
Anti-fissility	◎～×	○ 20	○ 19	○ 20	○ 19
						Bulkiness	◎～×	△	△	△	○
Flexibility	◎～×	△	△	△	○

(embodiment 46～50)

In embodiment 20,, operate in the same manner, obtain the BCF silk of embodiment 46～50 with embodiment 20 except that changing as the section of composition A, composition B.Need to prove, in embodiment 49, because can not spinning under the spinning temperature identical, so under 270 ℃ of spinning temperatures, carry out spinning with embodiment 20.Embodiment 46～50 the results are shown in table 12, and composition A, composition B among each embodiment are as follows.

Embodiment 46: composition A/ composition B=P4/N11

Embodiment 47: composition A/ composition B=P4/ (N6/N66)

Embodiment 48: composition A/ composition B=P4/N610

Embodiment 49: composition A/ composition B=P4/N66

Embodiment 50: composition A/ composition B=P7/N6-1

N11: nylon 11, melt viscosity 150Pasec ^-1, 185 ℃ of fusing points, melting hump thermal capacity 42J/g

N6/N66: with the nylon that the monomer of mol ratio 80/20 copolymer nylon 6 and nylon 66 obtains, relative viscosity 2.59,200 ℃ of fusing points, melting hump heat 50J/g, melt viscosity 150Pasec ^-1

N610: NYLON610, relative viscosity 2.59,225 ℃ of fusing points, melt heat peak 68J/g, melt viscosity 150Pasec ^-1

N66: nylon 66, relative viscosity 2.59,260 ℃ of fusing points, melt heat peak 73J/g, melt viscosity 150Pasec ^-1

By embodiment 20, embodiment 46～48 as can be known, by adopting crystallinity is high among the present invention composition B, can promote sheath composition crystallization man-hour more curling to add, obtain the good crimped yarn of anti-fissility as the sheath composition.In addition, the crystallinity of crimped yarn is high more, and the firmness that curls is high more, and then can long term maintenance braiding grey tube cloth or the bulkiness and the flexibility of carpet, and feel is good.

By embodiment 20 and embodiment 49～50 as can be known, the composition A, the composition B that have the fusing point of preferable range of the present invention by use, can suppress owing to the hot deterioration of composition A, viscosity reduce the viscosity inequality of the composition A inside that produces, and then obtains the good crimped yarn of anti-fissility.By making composition A inside that the viscosity inequality not take place, spin-drawing operation SMIS composition and sheath composition evenly are orientated, and then it is poor to be difficult for producing the heat shrinkability characteristic of core composition and sheath composition in the processing of curling.As a result, receive low crimped yarn owing to obtain boiling, so the anti-fissility of this crimped yarn is good.

Embodiment 20 compares with embodiment 49～50, because the core composition is configured in the central part of fiber cross section, and constitute core composition, sheath composition with the preferred polymer of the present invention, so can make the fiber surface sheath composition (minimum of a value of thickness that is the sheath composition is big) that evenly is covered, and then obtain the also good crimped yarn of ABRASION RESISTANCE.

In addition, embodiment 20 compares with embodiment 49～50, because the crystallinity height of crimped yarn, thus the firmness height that curls, can long term maintenance braiding grey tube cloth or the bulkiness and the flexibility of carpet, feel is good.

(embodiment 51)

In embodiment 20,, operate in the same manner, obtain the BCF silk of embodiment 51 with embodiment 20 except that spinning temperature being made as 270 ℃.Spinnability is not good, and broken string takes place in the spinning of 100kg 10 times.

Comparing embodiment 20 and embodiment 51 by adopting the preferred spinning temperature of the present invention, can suppress the deterioration of composition A as can be known, improve spinnability.

Can suppress the viscosity inequality that the hot deterioration of composition A causes more, in spin-drawing operation SMIS composition and the easy more even orientation of sheath composition, and then it is poor to be difficult to produce the heat shrinkability characteristic of core composition and sheath composition in the processing of curling.The result receives low crimped yarn owing to obtaining boiling, so the anti-fissility of this crimped yarn is good.

By suppressing the hot deterioration of composition A, can make the core composition be configured in the central part of fiber cross section, and then fiber surface evenly is covered by the sheath composition (minimum of a value of sheath composition thickness is big), so obtained the also good crimped yarn of ABRASION RESISTANCE.

(embodiment 52)

In embodiment 36, do not use the spin-drawing apparatus for continous heat treatment, promptly after heat treatment, do not carry out air flow jetting method stuffer box crimping processing, and use batching apparatus, in addition, operate in the same manner with embodiment 36, obtain not curling drawn yarn.It is as follows that drawn yarn is made the system condition.

Drawn yarn is made the system condition

Mixing roll temperature: 230 ℃

Spinning temperature: 245 ℃

Filtering layer: fill 30# inorganic oxide aluminium

Filter: 20 μ m nonwoven fabric filters

Spinning head 2 (polymer is about to the spinning head before the ejection): slit width 0.15mm, the long 1.5mm of slit, hole count 96

Spinning head 1 (the spinning head of pattern Figure 45 of Figure 12.Near spinning head 2 and before being present in it, core composition, sheath composition have stream separately):

Sheath composition aperture 0.5mm, the long 0.5mm of squit hole, be 3 with respect to 1 filament hole count

Core composition slit width 0.12mm, the long 1.2mm of slit, be 1 with respect to 1 filament hole count

Spray volume: 498.6g/ minute (1 assembly, 1 strand, 96 filaments)

Core sheath ratio: core composition/sheath composition=80/20

Cooling: the single current that uses the long 1m of cooling.20 ℃ of cooling air temperature, wind speed 0.5m/ second, cooling starting position are positioned at 0.1m under the spinning head surface

Finish: adhering to 10% fatty acid ester concentration with respect to silk is 10% emulsus finish

The 1st roll temperature: 25 ℃

The 2nd roll temperature: 70 ℃

The 3rd roll temperature: 135 ℃

The 4th roll temperature: 190 ℃

The 7th roll temperature: 25 ℃

The 1st roller speed: 840m/ minute (=the 2 roller speed/1.02)

The 2nd roller speed: 857m/ minute

The 3rd roller speed: 2400m/ minute

The 4th roller speed: 3000m/ minute

The 7th roller speed: 2900m/ minute

Coiling speed: 2860m/ minute

Comprehensive stretching ratio: 3.5 times of (the 2nd～the 3rd rollers: the 2.8 times, the 3rd～the 4th roller: 1.25 times)

Nozzle compressed air: 0.2MPa interweaves

Use false twisting processing unit (plant) shown in Figure 13 that the drawn yarn that obtains is carried out false twisting processing (Breria processing).The drawn yarn 50 that is about to untie from drawn yarn tube 48 is via thread guide 49,51,52, after being supplied to roller 53 and deriving, utilizes 54 heating of the 1st heater, makes the twist yarn heat setting, via thread guide 55, and cooling on coldplate 56.Then, utilize three twisting frame 57 backtwistings, derive by draw roll 58.Next, utilize 59 heating of the 2nd heater,, after the nozzle 62 that interweaves interweaves, batch false twist yarn 64 via thread guide 63 via conveying roller 60, thread guide 61.At this moment, implement draw false twisting processing under the following conditions: stretching ratio is 1.05 times (speed of the speed/donor rollers 53 of=draw roll 58), the temperature of the 1st heater 54 is 180 ℃, the temperature of the 2nd heater 59 is 200 ℃, the D/Y of three twisting frames 57 (polyurethane dish (urethane disk)) is 1.7 than (speed of the linear velocity/draw roll 58 of=polyurethane dish), overfeeding (overfeed) rate ([speed of { speed of the speed-conveying roller 60 of draw roll 58 }/draw roll 58] * 100) is 15%, the speed of conveying roller 60 is 600m/ minute, the compressed air of nozzle of interweaving is 0.2MPa.Though be not the level that causes problem this moment, when obtaining the false twist yarn of 100kg, broken string takes place 3 times.Crimp extension rate after the false twist yarn boiling water treating that obtains is 20%, intensity be 2.4cN/dtex, filament fiber number be 20dtex, boil receive be 6%, degree of stretching is 45%, the minimum of a value of sheath composition thickness is that 0.8 μ m, CF value are 13.When the anti-fissility of the false twist yarn of estimating embodiment 52, as seen light colorization, albefaction, fluffing take place, can in the little dress material purposes of suffered external force etc., use (overall merit of anti-fissility is 12 minutes as △ (qualified) overall merit).The false twist yarn of embodiment 52 is in filamentary ring to have directionality and also has a kind of like this rolled state of residual torque, the BCF silk of embodiment 36 is to be made of the more irregular filament of directionality, amplitude that encircles, and is the crimped yarn of noresidue torque.That is, by making BCF silk, can disperse to be applied to the external force on the crimped yarn, thereby obtain the good crimped yarn of anti-fissility with the preferred wrapped configuration of the present invention.

(comparative example 13)

Use false twisting processing unit (plant) shown in Figure 13, under the following conditions the drawn yarn that obtains among the embodiment 52 is implemented false twisting processing (simulate wool processing), in addition, operate in the same manner, obtain false twist yarn with embodiment 52.That is, the drawn yarn 50 that will untie from drawn yarn tube 48 will be utilized 54 heating of the 1st heater after being supplied to roller 53 and deriving via thread guide 49,51,52, make the twist yarn heat setting, cool off on coldplate 56 via thread guide 55.Then, utilize three twisting frame 57 backtwistings, derive by draw roll 58.Next, from the silk road, take off the 2nd heater 59 (not heating), by conveying roller 60,, utilize the nozzle 62 that interweaves to implement to interweave, then via thread guide 63 curling false twist yarns 64 via thread guide 61.At this moment, make that stretching ratio is that the temperature of 1.05 times (speed of the speed/donor rollers 53 of=draw roll 58), the 1st heater 54 is that the D/Y of 180 ℃, three twisting frames 57 (polyurethane dish) is 1.7 than (speed of the linear velocity/draw roll 58 of=polyurethane dish), the speed of the speed of draw roll 58 and conveying roller 60 is 600m/ minute, the compressed air of the nozzle that interweaves is 0.2MPa, implements draw false twisting processing.Though be not the level that causes problem this moment, when obtaining the 100kg false twist yarn, broken string takes place 3 times.Crimp extension rate after the boiling water treating of the false twist yarn that obtains is 25%, is the crimped yarn with good bulkiness, and intensity is 3.7cN/dtex, and degree of stretching is 28%, and the receipts of boiling are 13%.When the anti-fissility of the false twist yarn of estimating comparative example 13, albefaction, fluffing are obviously, can be observed sample perforate etc., it is the labile crimped yarn of outward appearance, aspect anti-fissility, it is the fiber (overall merit of anti-fissility is * (defective) that overall merit is 5 minutes) that lacks practicality.Comparing embodiment 52 and comparative example 13 are as can be known, by behind backtwisting, implementing to reduce the degree of orientation of amorphous portion, promote crystallization while heating the processing (Breria processing) of carrying out high loose processing, can obtain intensity thus, boil and receive all low false twist yarn, and then improve anti-fissility.

(embodiment 53)

Dry respectively PLA P4 (170 ℃ of fusing points, melt viscosity 200Pasec as composition A ^-1), as nylon 6 (N6-5,225 ℃ of fusing points, the melt viscosity 60Pasec of the sulfuric acid relative viscosity 2.15 of the composition B that in the core composition, mixes ^-1), as nylon 6 (N6-6,225 ℃ of fusing points, the melt viscosity 150Pasec of sulfuric acid relative viscosity 2.60 of the composition B that is used for the sheath composition ^-1), the adjustment moisture rate is 50～100ppm.

As spinning machine, use the spinning continuous crisping applicator with twin shaft mixing roll shown in Figure 14, carry out melt spinning, stretching, heat treatment continuously, curl and handle, obtain air flow jetting method stuffer box crimping elastic filament.

Measure composition A and composition B respectively, make the mixing of cutting into slices of mixing ratio=40/60 (weight ratio) of composition A (P4)/composition B (N-1), put into then in the core composition hopper 65 shown in Figure 14, in sheath composition hopper 66, drop into composition B (N-2), utilize twin shaft to extrude mixing roll 67 respectively, the mixed polymer of 68 fusions and mixing composition A and composition B, and composition B, import spinning manifold 69, utilize gear pump 70,71 each polymer of metering, and discharge, importing is present in the filament spinning component 72 of spinning manifold 69 inside, is spun with the spinning-nozzle 73 that spinning head has 120 pores by the trilobal cross cross section.At this moment, select the rotation number of the gear pump of core composition, sheath composition, make compound ratio=80/20 (weight ratio) (the core-sheath-type composite fibre contains 32 weight % composition A with respect to gross weight) of core composition/sheath composition.With single current cooling device 74 cooling curing strands 75, oil by oiling device 76.After further being derived by the 1st roller 77, by the 2nd roller 78, the velocity ratio of the 3rd roller 79 stretches, utilize the 3rd roller 79 to heat-treat, by the 3rd roller 79, the speed of the 4th roller 80 stretches than further implementing, utilize the 4th roller 80 to carry out heat treatment once more, between the 4th roller and chill roll, make strand loose on one side, utilize on one side and use the curling processing nozzle 81 that adds hot fluid to give air flow jetting method stuffer box crimping, surface at chill roll 82 is cooled to room temperature with crimped yarn, fixed structure, at the 6th roller 83, apply the tension force (0.05～0.10cN/dtex of the degree of not launching to curl between the 7th roller 84 on one side, fiber number is used the fiber number of the crimped yarn that batches), elongation on one side, utilize coiling machine 86 to batch, carry out 1 section spinning thus, stretch, heat treatment, curl and handle, obtain 1800dtex, 120 filamentary air flow jetting method stuffer box crimping elastic filament (bobbin bag 85).Carried out the sampling of about 100kg, but do not break, monofilament stream etc., the spinnability stabilizer pole.Embodiment 53 the results are shown in table 13.

Need to prove that melt spinning, stretching, heat treatment, the treatment conditions of curling are as follows.

Mixing roll temperature: 230 ℃

Spinning temperature: 240 ℃

Filtering layer: fill 30# inorganic oxide aluminium

Filter: 20 μ m nonwoven fabric filters

Spinning head: slit width 0.15mm, the long 1.5mm of slit, hole count 120

Spinning head 2 (polymer is about to the spinning head before the ejection): slit width 0.15mm, the long 1.5mm of slit, hole count 120

Spinning head 1 (the spinning head of pattern Figure 45 of Figure 12.Near spinning head 2 and before being present in it, core composition, sheath composition have stream separately):

Sheath composition aperture 0.4mm, the long 0.5mm of squit hole, be 4 with respect to 1 filament hole count

Core composition slit width 0.08mm, the long 1.2mm of slit, be 1 with respect to 1 filament hole count

Spray volume: 360g/ minute (1 assembly, 1 strand, 120 filaments)

Cooling: the single current that uses the long 1m of cooling.20 ℃ of cooling air temperature, wind speed 0.5m/ second, cooling starting position 0.1m under the spinning head surface

Finish: adhering to 10% fatty acid ester concentration with respect to silk is 10% emulsus finish

The 1st roll temperature: 25 ℃

The 2nd roll temperature: 75 ℃

The 3rd roll temperature: 140 ℃

The 4th roll temperature: 190 ℃

Chill-roll temperature: 25 ℃

The 6th roll temperature: 25 ℃

The 7th roll temperature: 25 ℃

Heating steam treatment temperature: 225 ℃

The 1st roller speed: 690m/ minute

The 2nd roller speed: 700m/ minute

The 3rd roller speed: 1750m/ minute

The 4th roller speed: 2800m/ minute

Chill roll speed: 80m/ minute

The 6th roller speed: 2000m/ minute

The 7th roller speed: 2040m/ minute

Coiling speed: 2000m/ minute

When the cross section of the air flow jetting method stuffer box crimping elastic filament that obtains is carried out tem observation, can be observed and have homodisperse island structure, the diameter of island component is 0.05～0.30 μ m.In addition, because non-staining components forms island component, so, be that composition A is the island, (the mixed with polymers body structure is a) for extra large island structure for composition B.This crimped yarn crimp extension rate is 25%, and restriction load percentage elongation down is 19%, shows good curl characteristics, and has curling of being difficult to untie.Use this crimped yarn to make carpet and carry out wear-resistant test, result's reduction rate that weares and teares is 10%, shows good ABRASION RESISTANCE.The circular knit of making this crimped yarn presses stable on heating evaluation, and outward appearance does not change fully as a result, and shows good heat resistance.Can be observed fusing point (from the peak of composition B) and the melting hump of each composition of resulting near (from the peak of composition A) near 170 ℃ and 225 ℃ in the DSC of this crimped yarn, the thermal capacity summation of each melting hump is 74J/g, has sufficient crystallinity.

(embodiment 54～57)

In embodiment 53, composition A in changing the hopper that is filled into the core composition and the blending ratio of composition B,, obtain the air flow jetting method stuffer box crimping elastic filament of embodiment 54～57 with embodiment 53 identical operations.Embodiment 54～57 the results are shown in table 13, and the blending ratio (weight ratio) of composition A among each embodiment and composition B is as follows.

Embodiment 54: composition A/ composition B=20/80

Embodiment 55: composition A/ composition B=55/45

Embodiment 56: composition A/ composition B=70/30

Embodiment 57: composition A/ composition B=90/10

By embodiment 54～57 as can be known, the crimped yarn of core-sheath-type composite fibre of the present invention is by having composition B as the core composition, can utilize the interaction of composition B of composition B, the sheath composition of core composition to improve the cementability at core sheath interface, thereby show good ABRASION RESISTANCE.In addition, the blending ratio of composition A, composition B by making the core composition is in preferred range of the present invention, the diameter of mixed with polymers body structure, island component that can make the core composition is in preferred range, and then can access the air flow jetting method stuffer box crimping elastic filament of high abrasion resistance.And owing to have curling of being difficult to untie, so when making carpet, even long-term the use, also can keep with the bulkiness is the quality of representative, and can access the carpet that no ABRASION RESISTANCE wears out.

(embodiment 58～60)

In embodiment 53, except that the thickness of the sheath composition of the compound ratio that changes core composition and sheath composition, the drawn yarn that obtains, operate in the same manner, obtain the air flow jetting method stuffer box crimping elastic filament of embodiment 58～60 with embodiment 53.

Embodiment 58～59 does not break, and spinnability is good, and broken string takes place in the spinning of 100kg 2 times embodiment 60.Embodiment 58～60 the results are shown in table 14, core composition among each embodiment and sheath composition compound more as follows than (weight ratio).

Embodiment 58: core composition/sheath composition=85/15

Embodiment 59: core composition/sheath composition=90/10

Embodiment 60: core composition/sheath composition=95/5

Comparing embodiment 53 (table 13), embodiment 58～60 (table 14) as can be known, the thickness of sheath composition is thick more, can access crimp extension rate height, the restriction load crimped yarn of percentage elongation height and high abrasion resistance down more.In addition, the sheath composition is thick more, can obtain not only high abrasion resistance more, and the high-quality crimped yarn that limits percentage elongation height under the load, promptly curls and be difficult to untie.

Table 14

Project		Embodiment 58	Embodiment 59	Embodiment 60
					Composition A	-	P4	P4	P4
The fusing point of composition A (Tma)	℃	170	170	170
					(η a) for the melt viscosity of composition A	Pa·sec -1	200	200	200
Be blended in the composition B in the core composition	-	N6-5	N6-5	N6-5
					Be blended in the fusing point (Tmb) of the composition B in the core composition	℃	225	225	225
Be blended in the melt viscosity (η b) of the composition B in the core composition	Pa·sec -1	60	60	60
					Composition B as the sheath composition	-	N6-6	N6-6	N6-6
Be used as the fusing point of the composition B of sheath composition	℃	225	225	225
					Be used as the melt viscosity of the composition B of sheath composition	Pa·sec -1	150	150	150
Composition A and the mixing ratio (composition A/ composition B) that is blended in the composition B in the core composition	-	40/60	40/60	40/60
					Composition A and be blended in the melt viscosity of the composition B in the core composition than (η b/ η a)	-	0.30	0.30	0.30
Core sheath weight ratio (core composition/sheath composition)	-	85/15	90/10	95/5
					The content of composition A	Weight %		34	36	38
The ejection linear velocity	m/min	4.3	4.3	4.3
					The thickness of sheath composition	μm	1.6	1.1	0.5
The minimum of a value of sheath composition thickness	μm	1.4	1.0	0.4
					The mixed with polymers body structure *	-	a	a	a
The diameter of island component	μm	0.05-0.30	0.05-0.30	0.05-0.30
					Crimp extension rate after the boiling water treating	％		25	25	25
The restriction load is curling percentage elongation down	％	16	14	12
					The wearing and tearing reduction rate	Weight %		11	14	17
Degree of profile	-	3.0	3.0	3.0
					The intensity of crimped filament	cN/dtex	2.5	2.4	2.3
The degree of stretching of crimped filament	％		45	45						45
					The thermal capacity summation of fiber melting hump	J/g	74	72	70
The flatiron heat resistance	◎～××	◎	◎	◎
					Spinnability	◎～△	◎	◎	○

* judge the mixed with polymers body structure based on following a～c

A: island component is that composition A, marine origin are divided into composition B

B: island component is that composition B, marine origin are divided into composition A

C: composition A, composition B are sea component (extra large structure)

(embodiment 61～65)

In embodiment 53, except that the temperature that changes the 4th roller, carry out spinning, stretching, heat treatment in the same manner, curl and handle with embodiment 53, obtain air flow jetting method stuffer box crimping elastic filament.The Barus effect that spins silk in embodiment 53,61～64 is little, does not also have broken string, and spinning is extremely stable, and in embodiment 65, slight silk takes place on the 4th roller shake, and broken string takes place 1 time.Embodiment 61～65 the results are shown in table 15.The temperature of the 4th roller among the embodiment 61～65 is as follows.

Temperature=140 of 61: the 4 rollers of embodiment ℃

Temperature=150 of 62: the 4 rollers of embodiment ℃

Temperature=175 of 63: the 4 rollers of embodiment ℃

Temperature=200 of 64: the 4 rollers of embodiment ℃

Temperature=210 of 65: the 4 rollers of embodiment ℃

Comparing embodiment 53 (table 13) and embodiment 62～63 (table 15) and embodiment 61,65 (table 15) by adopting the preferred crimp extension rate of the present invention, can improve ABRASION RESISTANCE as can be known tremendously.The crimped yarn of embodiment 53,62～63 is owing to be the crimped yarn with suitable crimp extension rate, so when being worn because of external force, crimped yarn is difficult for falling, and owing to have suitable bending or obvolvent between monofilament, external force is disperseed on each monofilament, thereby show good ABRASION RESISTANCE.

Table 15

Project		Embodiment 61	Embodiment 62	Embodiment 63	Embodiment 64	Embodiment 65
							Composition A	-	PLA-1	PLA-1	PLA-1	PLA-1	PLA-1
The fusing point of composition A (Tma)	℃	170	170	170	170	170
							(η a) for the melt viscosity of composition A	Pa·sec -1	200	200	200	200	200
Be blended in the composition B in the core composition	-	N6-5	N6-5	N6-5	N6-5	N6-5
							Be blended in the fusing point (Tmb) of the composition B in the core composition	℃	225	225	225	225	225
Be blended in the melt viscosity (η b) of the composition B in the core composition	Pa·sec -1	60	60	60	60	60
							Composition B as the sheath composition	-	N6-6	N6-6	N6-6	N6-6	N6-6
Be used as the fusing point of the composition B of sheath composition	℃	225	225	225	225	225
							Be used as the melt viscosity of the composition B of sheath composition	Pa·sec -1	150	150	150	150	150
Composition A and the mixing ratio (composition A/ composition B) that is blended in the composition B in the core composition	-	40/60	40/60	40/60	40/60	40/60
							Composition A and be blended in the melt viscosity of the composition B in the core composition than (η b/ η a)	-	0.30	0.30	0.30	0.30	0.30
Core sheath weight ratio (core composition/sheath composition)	-	80/20	80/20	80/20	80/20	80/20
							The content of composition A	Weight %	32	32	32	32	32
The ejection linear velocity	m/min	4.3	4.3	4.3	4.3	4.3
							The thickness of sheath composition	μm	2.2	2.2	2.2	2.2	2.2
The minimum of a value of sheath composition thickness	μm	2.0	2.0	2.0	2.0	2.0
							The mixed with polymers body structure *	-	A	a	a	a	a
The diameter of island component	μm	0.05-0.20	0.05-0.20	0.05-0.20	0.05-0.20	0.05-0.20
							Crimp extension rate after the boiling water treating	％	4	6	15	33	36
The restriction load is curling percentage elongation down	％	2	4	11	25	28
							The wearing and tearing reduction rate	Weight %	25	18	13	8	18
Degree of profile	-	3.0	3.0	3.0	3.0	3.0
							The intensity of crimped filament	cN/dtex	3.5	3	2.7	2.2	1.1
The degree of stretching of crimped filament	％	45	45	45	45	45
							The thermal capacity summation of fiber melting hump	J/g	72	73	74	74	75
The flatiron heat resistance	◎～××	◎	◎	◎	◎	◎
							Spinnability	◎～△	◎	◎	◎	◎	○

* judge the mixed with polymers body structure based on following a～c

A: island component is that composition A, marine origin are divided into composition B

B: island component is that composition B, marine origin are divided into composition A

C: composition A, composition B are sea component (extra large structure)

(embodiment 66～68)

In embodiment 53, change the specification of used spinneret hole, and change the degree of profile of the air flow jetting method stuffer box crimping elastic filament obtain, in addition carry out spinning, stretching, heat treatment in the same manner, curl and handle with embodiment 53, obtain the air flow jetting method stuffer box crimping elastic filament of embodiment 66～68.Embodiment 66～68 the results are shown in table 16.The specification of the spinneret hole of using among the embodiment 66～68 is as follows.

Embodiment 66

Spinning head 2 (polymer is about to the spinning head before the ejection): slit width 0.20mm, slit width 0.8mm, hole count 120

Embodiment 67

Spinning head 2 (polymer is about to the spinning head before the ejection): the long 0.18mm of slit, slit width 1.0mm, hole count 120

Embodiment 68

Spinning head 2 (polymer is about to the spinning head before the ejection): the long 0.12mm of slit, slit width 1.8mm, hole count 120

Comparing embodiment 53 (table 13), embodiment 66～68 by adopting the high air flow jetting method stuffer box crimping elastic filament of degree of profile among the present invention, can access the crimped yarn of high abrasion resistance as can be known.Promptly, the degree of profile of crimped yarn is high more among the present invention, the diameter of easy more miniaturization island component in the spinning process, owing to have the homodisperse mixed with polymers body structure in island, so improved the bonding interface of the composition B of the composition A/ composition B of core composition and sheath composition, thereby obtained not having the crimped yarn of the high abrasion resistance of fibrillation.By making the high crimped yarn of degree of profile, obtained the crimped yarn that is difficult to launch, even use ABRASION RESISTANCE also not reduce for a long time.

Table 16

Project		Embodiment	66	Embodiment 67	Embodiment 68
						Composition A	-	P4	P4	P4
The fusing point of composition A (Tma)	℃	170	170	170
					(η a) for the melt viscosity of composition A	Pa·sec -1	200	200	200
Be blended in the composition B in the core composition	-	N6-5	N6-5	N6-5
					Be blended in the fusing point (Tmb) of the composition B in the core composition	℃	225	225	225
Be blended in the melt viscosity (η b) of the composition B in the core composition	Pa·sec -1	60	60	60
					Composition B as the sheath composition	-	N6-6	N6-6	N6-6
Be used as the fusing point of the composition B of sheath composition	℃	225	225	225
					Be used as the melt viscosity of the composition B of sheath composition	Pa·sec -1	150	150	150
Composition A and the mixing ratio (composition A/ composition B) that is blended in the composition B in the core composition	-	40/60	40/60	40/60
					Composition A and be blended in the melt viscosity of the composition B in the core composition than (η b/ η a)	-	0.30	0.30	0.30
Core sheath weight ratio (core composition/sheath composition)	-	80/20	80/20	80/20
					The content of composition A	Weight %	32	32	32
The ejection linear velocity	m/min	6.1	5.4	4.5
					The thickness of sheath composition	μm	2.2	2.2	2.2
The minimum of a value of sheath composition thickness	μm	2.1	2.1	1.9
					The mixed with polymers body structure *	-	a	a	a
The diameter of island component	μm	0.05-0.45	0.05-0.35	0.05-0.20
					Crimp extension rate after the boiling water treating	％	25	25	25
The restriction load is curling percentage elongation down	％	10	14	20
					The wearing and tearing reduction rate	Weight %	19	15	8
Degree of profile	-	1.2	1.3	4.0
					The intensity of crimped filament	cN/dtex	2.5	2.5	2.4
The degree of stretching of crimped filament	％	45	45	45
					The thermal capacity summation of fiber melting hump	J/g	71	72	70
The flatiron heat resistance	◎～××	◎	◎	◎
					Spinnability	◎～△	◎	◎	◎

* judge the mixed with polymers body structure based on following a～c

A: island component is that composition A, marine origin are divided into composition B

B: island component is that composition B, marine origin are divided into composition A

C: composition A, composition B are sea component (extra large structure)

(embodiment 69)

(spin-drawing curls and processes)

Utilize extruder under 230 ℃ of melting temperatures, with mixing mass ratio (PLA: nylon) 30: 70 mixing as composition A PLA P4 and as the nylon 6 (225 ℃ of melt viscosity 580poise, fusing points) of composition B, be supplied in spinning machine.

Making the spinning temperature in the spinning machine is 230 ℃, after in filament spinning component, filtering with the metal nonwoven fabric filter of width of mesh 20 μ m, and the spinning head ejection strand of the hole count 54 by having Y shape hole.

After solidifying by the path air cooling from the spinning strand of spinning head ejection, give the finish liquid of the 25 quality % that diluted by low viscosity mineral oil, go up and twine at carry-over pinch rolls (Nelson forming roll, rotary speed 700m/ minute, roll temperature 65 ℃) then.

Do not batch, and strand is continued to go up and to twine at the 1st draw roll (Nelson forming roll, rotary speed 600m/ minute, roll temperature 110 ℃), carry out the 1st section stretching thus.Do not batch strand and continue to go up and twine, carry out the 2nd section stretching thus at the 2nd draw roll (Nelson forming roll, rotary speed 1800m/ minute, roll temperature 150 ℃).

Do not batch strand and continue, utilize the processing of curling of 170 ℃, the heated compressed air of 0.8MPa, and make its ejection, cooling rotating on the transfer device the stretching strand processing unit (plant) that import to curl.Next, utilize 21 pair of separate rollers that chock plug shape crimped yarn piece is applied stretching, piece is untied.This crimped yarn is implemented interleaving treatment, coil into the bobbin shape, obtain the crimped yarn of 2000dtex-94fil.

When the lining that the crimped yarn that obtains is observed polylactic resin in the fiber and nylon 6 concern, handle the stripping island structure by sodium hydrate aqueous solution, residual extra large structure confirms that thus polylactic resin forms island structure, the extra large structure of nylon 6 formation.

The farmland of island structure is of a size of 25～400nm (average 180nm).

The degree of profile of Y shape fibre section is 1.34.

(twisted filament)

Above-mentioned crimped yarn is implemented 160 times/m S twist yarn conduct twist yarn down, again 2 rhizoids are merged, implement 160 times/m Z twist yarn, under 105 ℃, carry out heat setting as last twist yarn.

(dyeing)

Because nylon 6 forms the lining composition, so the following processing of dyeing in order to utilize metalliferous dye dyeing nylon 6.

In dyeing caldron, prepare 1: 15 dye bath of bath raio, add IRGALAN (R) BlackRBLN 2.0%owf as metalliferous dye, add 0.5g/l acetate, 0.5g/l ammonium sulfate as dyeing assistant, in this dye bath, add above-mentioned twisted filament, handled 20 minutes 90 ℃ of dyeing.

(base cloth)

Obtain filament fiber number 5.5dtex, weight per unit area 100g/m by PLA P4 ²Spun-bonded non-woven fabrics, as the base cloth of carpet.

(bunchy)

On above-mentioned base cloth with 1/8 space (gauge), 6.8/mm of stitch is above-mentioned twisted filament bunchy, obtains pile weight per unit area 700g/m ²Automobile select the pad cord carpet.

The wearing and tearing reduction rate of the carpet that obtains is 3.5%, is 33.3% that the wearing and tearing reduction rate behind the hydrothermal aging is 5.2%, shows good ABRASION RESISTANCE in 5500 rotation wearing and tearing in 300 rotation wearing and tearing.In addition, the selection pad that obtains is good dark color with carpet.

(embodiment 70)

(spin-drawing curls and processes)

Carry out the curling processing of spin-drawing in the same manner with embodiment 69.

(twisted filament)

Carry out twisted filament in the same manner with embodiment 69.

(dyeing)

Dye in the same manner with embodiment 69.

(base cloth)

Use the base cloth of the base cloth identical as carpet with embodiment 69.

(bunchy)

On above-mentioned base cloth with 1/8 space, 7.5/mm of stitch is above-mentioned twisted filament bunchy, cuts the front end of pile, obtains pile length 10mm, pile weight per unit area 1100g/m ²Automobile select the pad saxony carpet.

The selection pad that obtains is 2.2%, is 20.8% that with the wearing and tearing reduction rate of carpet the wearing and tearing reduction rate behind the hydrothermal aging is 3.1%, has good ABRASION RESISTANCE in 5500 rotation wearing and tearing in 300 rotation wearing and tearing.The selection pad that obtains is good dark color with carpet.

(embodiment 71)

(spin-drawing curls and processes)

Except that the hole count of total spray volume that changes polymer and spinning head, carry out the curling processing of spin-drawing in the same manner with embodiment 69, obtain the crimped yarn of 1450dtex-54fil.

When the lining that the crimped yarn that obtains is observed polylactic resin in the fiber and nylon 6 concern, handle the stripping island structure by sodium hydrate aqueous solution, residual extra large structure confirms that thus polylactic resin forms island structure, the extra large structure of nylon 6 formation.

The farmland of island structure is of a size of 25～400nm (average 200nm).

The degree of profile of Y shape fibre section is 1.34.

(twisted filament)

Do not carry out twisted filament.

(dyeing)

Because nylon 6 forms the lining composition, so dye in the same manner with embodiment 69 in order to dye nylon 6.

(base cloth)

Use the base cloth of the base cloth identical as carpet with embodiment 69.

(bunchy)

On above-mentioned base cloth with 1/10 space, 12/mm of stitch is above-mentioned crimped yarn bunchy, cuts the front end of pile, obtains pile length 6mm, pile weight per unit area 450g/m ²Automobile long fiber flax pad VELVET carpet.

The wearing and tearing reduction rate of the carpet that obtains is 2.6% in 300 rotation wearing and tearing, the wearing and tearing reduction rate behind the hydrothermal aging is 4.2%, has good ABRASION RESISTANCE.The carpet that obtains is good dark color.Heat bonding does not take place in the carpet that obtains, and heat resistance is good.

(comparative example 16)

(spin-drawing curls and processes)

Except that the mixing mass ratio with PLA and nylon becomes 100: 0, operate in the same manner with embodiment 69, obtain crimped yarn.

(twisted filament)

Carry out twisted filament in the same manner with embodiment 69.

(dyeing)

Because polylactic resin is 100 quality %, so for the following processing of dyeing with the disperse dyeing polylactic resin.

In dyeing caldron, prepare 1: 15 dye bath of bath raio, as DISPERSE DYES, disperse yellow KT-1, disperse red KT-1, the disperse blue KT-1 of 5%owf counted in interpolation with total dye strength, as dyeing assistant, add 0.5g/l acetate, 0.5g/l Nicca Sunsalt RM-340 (solar corona chemistry (strain) system), in this dye bath, add above-mentioned twisted filament, dye down at 110 ℃ and handled 30 minutes.

(base cloth)

Use the base cloth of the base cloth identical as carpet with embodiment 69.

(bunchy)

Carry out bunchy in the same manner with embodiment 69, obtain pile weight per unit area 700g/m ²Cord carpet.

The wearing and tearing reduction rate of the carpet that obtains is 6.3% in 300 rotation wearing and tearing, in 5500 rotation wearing and tearing be 95.2%, the wearing and tearing reduction rate behind the hydrothermal aging is 25.2%, and is all poor than embodiment 69.

(comparative example 17)

(spin-drawing curls and processes)

Except that the mixing mass ratio with PLA and nylon is made as 70: 30, operate in the same manner with embodiment 69, obtain crimped yarn.

When the lining that the crimped yarn that obtains is observed polylactic resin in the fiber and nylon 6 concern, handle stripping sea structure by sodium hydrate aqueous solution, residual island structure confirms that thus polylactic resin forms extra large structure, nylon 6 formation island structures.

(twisted filament)

Carry out twisted filament in the same manner with embodiment 69.

(dyeing)

Because polylactic resin forms the lining composition, so dye in the same manner with comparative example 16 in order to utilize the disperse dyeing polylactic resin.

(base cloth)

Use the base cloth of the base cloth identical as carpet with embodiment 69.

(bunchy)

On above-mentioned base cloth with 1/8 space, 7.5/mm of stitch is above-mentioned twisted filament bunchy, cuts the front end of pile, obtains pile length 10mm, pile weight per unit area 1100g/m ²Saxony carpet.

The wearing and tearing reduction rate of the carpet that obtains is 3.2% in 300 rotation wearing and tearing, in 5500 rotation wearing and tearing be 75.1%, the wearing and tearing reduction rate behind the hydrothermal aging is 18.8%, compares relatively poor with embodiment 70.

(comparative example 18)

(spin-drawing curls and processes)

Except that the mixing mass ratio with PLA and nylon is made as 100: 0, operate in the same manner with embodiment 69, obtain crimped yarn.

(twisted filament)

Carry out twisted filament in the same manner with embodiment 69.

(dyeing)

Because polylactic resin is 100 quality %, so in order to dye in the same manner with comparative example 16 with the disperse dyeing polylactic resin.

(base cloth)

Use the base cloth of the base cloth identical as carpet with embodiment 69.

(bunchy)

On above-mentioned base cloth with 1/8 space, 7.5/mm of stitch is above-mentioned twisted filament bunchy, cuts the front end of pile, obtains pile length 10mm, pile weight per unit area 1100g/m ²Saxony carpet.

The wearing and tearing reduction rate of the carpet that obtains is 2.4% in 300 rotation wearing and tearing, in 5500 rotation wearing and tearing be 85.6%, the wearing and tearing reduction rate behind the hydrothermal aging is 19.9%, compares relatively poor with embodiment 70.

(comparative example 19)

(spin-drawing curls and processes)

Change the total spray volume of polymer and the hole count of spinning head, and to make the mixing quality ratio of PLA and nylon be 70: 30, in addition, carry out the spin-drawing processing of curling in the same manner, obtain the crimped yarn of 1450dtex-54fil with embodiment 69.

When the lining that the crimped yarn that obtains is observed polylactic resin in the fiber and nylon 6 concern, handle stripping sea structure by sodium hydrate aqueous solution, residual island structure confirms that thus polylactic resin forms extra large structure, nylon 6 formation island structures.

(twisted filament)

Do not carry out twisted filament.

(dyeing)

Because polylactic resin forms the lining composition, so dye in the same manner with comparative example 16 in order to utilize the disperse dyeing polylactic resin.

(base cloth)

Use the base cloth of the base cloth identical as carpet with embodiment 69.

(bunchy)

On above-mentioned base cloth with 1/10 space, 12/mm of stitch is above-mentioned crimped yarn bunchy, cuts the front end of pile, obtains pile length 6mm, pile weight per unit area 450g/m ²The VELVET carpet.

The wearing and tearing reduction rate of the carpet that obtains is 40.2% in 300 rotation wearing and tearing, the wearing and tearing reduction rate behind the hydrothermal aging is 50.3%, compares relatively poor with embodiment 71.In the heat-resistance test of gained carpet, the heat bonding of pile takes place, compare relatively poor with embodiment 71.

(comparative example 20)

(spin-drawing curls and processes)

Change the total spray volume and the spinning head of polymer, and the mixing mass ratio of PLA and nylon was made as 100: 0, in addition, carry out the curling processing of spin-drawing in the same manner, obtain the crimped yarn of 1450dtex-54fil with embodiment 69.

(twisted filament)

Do not carry out twisted filament.

(dyeing)

Because polylactic resin is 100 quality %, so dye in the same manner with comparative example 16 in order to utilize the disperse dyeing polylactic resin.

(base cloth)

Use the base cloth of the base cloth identical as carpet with embodiment 69.

(bunchy)

On above-mentioned base cloth with 1/10 space, 12/mm of stitch is above-mentioned crimped yarn bunchy, cuts the front end of pile, obtains pile length 6mm, pile weight per unit area 450g/m ²The VELVET carpet.

The wearing and tearing reduction rate of the carpet that obtains is 43.4% in 300 rotation wearing and tearing, the wearing and tearing reduction rate behind the hydrothermal aging is 70.2%, compares relatively poor with embodiment 71.

In the heat-resistance test of gained carpet, the heat bonding of pile takes place, heat resistance is poorer than embodiment 71.

(comparative example 21)

(spin-drawing curls and processes)

Change the total spray volume and the spinning head of polymer, and to make the mixing mass ratio of PLA and nylon be 0: 100, in addition, carry out the spin-drawing processing of curling in the same manner, obtain the crimped yarn of 1560dtex-96fil with embodiment 69.

(twisted filament)

Above-mentioned crimped yarn is applied 140 times/m S twist yarn conduct twist yarn down, and close 2 rhizoids, apply 140 times/m Z twist yarn, under 125 ℃, carry out heat setting as last twist yarn.

(dyeing)

Dye in the same manner with embodiment 69 in order to dye nylon 6.

(base cloth)

Use the base cloth of the base cloth identical as carpet with embodiment 69.

(bunchy)

On above-mentioned base cloth with 1/10 space, 8.5/mm of stitch is above-mentioned twisted filament bunchy, cuts the front end of pile, obtains pile length 10mm, pile weight per unit area 1100g/m ²Saxony carpet.

The wearing and tearing reduction rate of the carpet that obtains is 1.0% in 300 rotation wearing and tearing, in 5500 rotation wearing and tearing be 9.2%, the wearing and tearing reduction rate behind the hydrothermal aging is 2.1%, shows good ABRASION RESISTANCE.The colour rendering of gained carpet is compared relatively poor with embodiment.

(embodiment 72)

(spin-drawing)

Utilize extruder under 230 ℃ of melting temperatures, with mixing mass ratio (PLA: nylon) 30: 70 mixing as composition A PLA P4 and as the nylon 6 (225 ℃ of melt viscosity 580poise, fusing points) of composition B, be supplied in spinning machine.

Making the spinning temperature in the spinning machine is 230 ℃, utilize the metal nonwoven fabric filter of width of mesh 20 μ m in the filament spinning component to filter after, the spinning head of the hole count 26 by having circular port, ejection strand.

In the time of spinning speed 2000m/ minute, batch the undrawn yarn of 252dtex-26fil, use the longitudinal type stretching-machine then, under the condition of 3.0 times of stretching ratios, 90 ℃ of draft temperatures, 130 ℃ of setting temperatures, carry out 1 section stretching, obtain the drawn yarn of 84dtex-26fil.

When the lining that the gained drawn yarn is observed polylactic resin in the fiber and nylon 6 concern, handle the stripping island structure by sodium hydrate aqueous solution, residual extra large structure confirms that thus polylactic resin forms island structure, the extra large structure of nylon 6 formation.

The farmland of island structure is of a size of 15～200nm (average 100nm).

(doubling braiding)

And the drawn yarn of closing 4 gained, make the automotive seat reversible cloth.

(dyeing)

Because nylon 6 forms the lining compositions, so in order to utilize metalliferous dye that nylon 6 is dyeed, the following processing of dyeing.

In dyeing caldron, prepare 1: 15 dye bath of bath raio, add IRGALAN (R) BlackRBLN 2.0%owf as metalliferous dye, add 0.5g/l acetate, 0.5g/l ammonium sulfate as dyeing assistant, in this dye bath, add above-mentioned twisted filament, dye down at 90 ℃ and handled 20 minutes.

The automotive seat of gained has the practical intensity that goes up no problem, and the strength retention in 90 ℃ of atmosphere is 67.9%, and also no problem in practicality, ABRASION RESISTANCE is also good.

(embodiment 73)

(spin-drawing)

Make the mixing mass ratio (PLA: nylon) be 20: 80, in addition, operate in the same manner, obtain the drawn yarn of 84dtex-26fil of PLA and nylon with embodiment 72.

When the island that the drawn yarn that obtains is observed polylactic resin in the fiber and nylon 6 concern, handle the stripping island structure by sodium hydrate aqueous solution, residual extra large structure confirms that thus polylactic resin forms island structure, the extra large structure of nylon 6 formation.

(doubling braiding)

And the drawn yarn of closing 4 gained, make the automotive seat reversible cloth.

(dyeing)

Because nylon 6 forms the lining composition, so in order to utilize metalliferous dye that nylon 6 dyeing are dyeed in the same manner with embodiment 72.

Gained is weaved cotton cloth and is had the practical intensity that goes up no problem, and the strength retention in 90 ℃ of atmosphere is 75.8%, and also no problem in the practicality, ABRASION RESISTANCE is also good.

(comparative example 22)

(spin-drawing)

Except the mixing mass ratio (PLA: be 70: 30 nylon), operate in the same manner, obtain the drawn yarn of 84dtex-26fil that makes PLA and nylon with embodiment 72.

To the polylactic resin in the drawn yarn observation fiber that obtains and the island relation of nylon 6, handle stripping sea structure by sodium hydrate aqueous solution, residual extra large structure confirms that thus polylactic resin forms extra large structure, nylon 6 forms island structures.

(doubling braiding)

And close 4 drawn yarns that obtain, make reversible cloth in the same manner with embodiment 72.

(dyeing)

Because polylactic resin forms the lining composition, so dye in the same manner with comparative example 16 in order to utilize the disperse dyeing polylactic resin.

The strength retention that gained is weaved cotton cloth in 90 ℃ of atmosphere is 29.3%, and ABRASION RESISTANCE is compared with embodiment 72, and relatively poor, the result is difficult to practicality.

(comparative example 23)

(spin-drawing)

Except the mixing mass ratio that makes PLA and nylon is 100: 0, operate in the same manner with embodiment 72, obtain drawn yarn.

(doubling braiding)

And close 4 drawn yarns that obtain, make reversible cloth in the same manner with embodiment 72.

(dyeing)

Because polylactic resin is 100 quality %, so dye in the same manner with comparative example 16 in order to utilize the disperse dyeing polylactic resin.

The strength retention that gained is weaved cotton cloth in 90 ℃ of atmosphere is 25.6%, and is lower, and ABRASION RESISTANCE is compared also relatively poor with embodiment 72, and the result is difficult to practicality.

Table 18

Utilizability on the industry

According to the present invention, a kind of crimped yarn and fiber construct can be provided, described crimped yarn is made of synthetic fibers, its high abrasion resistance, and the taste after the dyeing is good, described synthetic fibers are made of fat adoption ester resin and thermoplastic polyamide resin, and synthetic fibers and the fiber construct that is best suited for general dress material purposes and industry material applications is provided.

Claims (33)

1, a kind of crimped yarn, it is characterized in that, give curling obtaining to the multifilament that is made of synthetic fiber, described synthetic fiber are made of aliphatic polyester resin (A) and thermoplastic polyamide resin (B), and aliphatic polyester resin (A) exposes on fiber surface hardly.

2, crimped yarn as claimed in claim 1, it is characterized in that, give curling obtaining to the multifilament that constitutes by synthetic fiber, described synthetic fiber are made of aliphatic polyester resin (A) and thermoplastic polyamide resin (B), are below 5% with respect to the ratio that exposes area of the aliphatic polyester resin (A) of fiber surface area.

3, crimped yarn as claimed in claim 1 is characterized in that, crimped yarn is the BCF silk.

4, crimped yarn as claimed in claim 1, the polyblend class synthetic fiber that form by containing aliphatic polyester resin (A) and thermoplastic polyamide resin (B) constitute, have the island structure of aliphatic polyester resin (A) formation island component, thermoplastic polyamide resin (B) formation sea component, the farmland of island component is of a size of 0.001 μ m～2 μ m.

5, crimped yarn as claimed in claim 4, wherein, aliphatic polyester resin (A) is a crystalline resin, fusing point is 150～230 ℃.

6, crimped yarn as claimed in claim 4, wherein, thermoplastic polyamide resin (B) is a crystalline resin, fusing point is 150～250 ℃.

7, crimped yarn as claimed in claim 4, wherein, aliphatic polyester resin (A) and thermoplastic polyamide resin's (B) blending ratio (weight ratio) is 5/95～55/45.

8, crimped yarn as claimed in claim 1, wherein, contain aliphatic polyester resin (A) and thermoplastic polyamide resin (B) and the polyblend that forms further adds the compound (C) that has two above reactive with active hydrogen groups in a part and obtains.

9, crimped yarn as claimed in claim 8, wherein, the reactive with active hydrogen group is at least a reactive group that is selected from glycidyl, oxazolinyl, carbodiimide and the anhydride group.

10, crimped yarn as claimed in claim 8, wherein, the compound (C) that contains two above reactive with active hydrogen groups in a part is 0.005～5 weight % with respect to the content of the total amount of the compound (C) that contains two above reactive with active hydrogen groups in aliphatic polyester resin (A), thermoplastic polyamide resin (B) and a part.

11, crimped yarn as claimed in claim 4, wherein, fiber surface forms the axially extended striated ditch of fiber, and the width of described striated ditch is 0.01 μ m～1 μ m.

12, crimped yarn as claimed in claim 11, wherein, the aspect ratio of striated ditch (width of the long axis length of striated ditch/striated ditch) is 10～500.

13, crimped yarn as claimed in claim 4 satisfies following rerum natura,

Intensity: more than the 1cN/dtex,

Crimp extension rate after the boiling water treating: 3～30%,

Degree of profile (D1/D2): 1.2～7.

14, crimped yarn as claimed in claim 4, wherein, contain 0.01～2 weight % with respect to aliphatic polyester resin (A) and be selected from least a kind of crystallization nucleating agent in talcum, sorbitol derivatives, phosphate slaine, the no machine aluminium compound of alkalescence, the melamine compound salt.

15; the manufacture method of crimped yarn; during with blending ratio (weight ratio) 5/95～55/45 mixing aliphatic polyester resin (A) and thermoplastic polyamide resin (B); (η b/ η is a) in the combination of 0.1～2 scope to select the ratio of melt viscosity; carry out melt spinning after the granulating or after mixing; making spinning temperature is Tmb+3 ℃～Tmb+40 ℃ with respect to thermoplastic polyamide resin's (B) fusing point Tmb; the ejection linear velocity that makes the spinning head squit hole is 0.02～0.4m/ second; form multifilament; essence vertical lower 0.01～0.15m with the spinning head surface is the cooling starting point; use from the wind speed 0.3～1m/ second of essence perpendicular to the direction of described multifilament; the gas cooled that wind-warm syndrome is 15～25 ℃; with the spin finish described multifilament that is covered; heat with 50～130 ℃ warm-up mill on one side; carry out 1～3 section stretching on one side; make the elongation at break of multifilament reach 15～65%; further making the final roll temperature after the stretching is Tma-30 ℃～Tma+30 ℃ with respect to the fusing point Tma of aliphatic polyester resin (A); carry out supplying to the air flow jetting tamponade device after the heat setting; the nozzle temperature that makes described device is than high 5～100 ℃ temperature of final roll temperature after stretching; the processing of curling; form the three-dimensional crimp elastic filament; contact and derive with drum cooler; batch with the speed that is lower than the final roller 10～30% after the stretching

Wherein, η a: the melt viscosity of aliphatic polyester resin (A), η b: thermoplastic polyamide resin's (B) melt viscosity.

16, the manufacture method of crimped yarn as claimed in claim 15 is added the compound (C) that has two above reactive with active hydrogen groups in a part and is carried out melting mixing as the phase solvation in aliphatic polyester resin (A) and/or thermoplastic polyamide resin (B).

17, the manufacture method of crimped yarn as claimed in claim 15, wherein, with respect to the total amount of the addition of the compound (C) that has two above reactive with active hydrogen groups in aliphatic polyester resin (A), thermoplastic polyamide resin (B) and a part, add the compound (C) that has two above reactive with active hydrogen groups in 0.005～5 weight % a part.

18, the manufacture method of crimped yarn as claimed in claim 15 is added at least a crystallization nucleating agent that is selected from talcum, sorbitol derivatives, phosphate slaine, the no machine aluminium compound of alkalescence, the melamine compound salt and is carried out melting mixing in aliphatic polyester resin (A) and/or thermoplastic polyamide resin (B).

19, the manufacture method of crimped yarn as claimed in claim 18, wherein, add 0.01～2 weight % with respect to aliphatic polyester resin (A) and be selected from least a crystallization nucleating agent in talcum, sorbitol derivatives, phosphate slaine, the no machine aluminium compound of alkalescence, the melamine compound salt.

20, crimped yarn as claimed in claim 1, it is characterized in that, constitute by the core-sheath-type composite fibre, the core composition of described core-sheath-type composite fibre is made of aliphatic polyester resin (A) or aliphatic polyester resin (A) and thermoplastic polyamide resin's (B) polyblend, the sheath composition is made of thermoplastic polyamide resin (B), and has a rerum natura of following (1)～(3)

(1) intensity: 1.5～3cN/dtex,

(2) filament fiber number: 5～40dtex,

(3) boiling water shrinkage: below 6%.

21, crimped yarn as claimed in claim 20, wherein, the thermal capacity summation of the melting hump of the differential heat curve of the crimped yarns of measuring with 16 ℃/minute of programming rates is more than the 50J/g.

22, crimped yarn as claimed in claim 20, wherein, the core sheath is 10/90～65/35 than (weight ratio).

23, crimped yarn as claimed in claim 20, wherein, the filamentary degree of profile (D3/D4) of crimped yarn is 1.3～4.

24, crimped yarn as claimed in claim 20, wherein, the crimp extension rate after the boiling water treating of crimped yarn is 5～35%.

25, crimped yarn as claimed in claim 20 is 2～30% in the crimp extension rate of carrying out under the 2mg/dtex load measuring after the boiling water treating (percentage elongation under the restriction load).

26, crimped yarn as claimed in claim 20, wherein, aliphatic polyester resin of core composition (A) and thermoplastic polyamide resin's (B) blending ratio (weight ratio) is 95/5～20/80.

27, core-sheath-type composite fibre as claimed in claim 26, wherein, the mixture structure of the polyblend of core composition satisfies following (1)～(3),

(1) aliphatic polyester resin (A) forms island component,

(2) thermoplastic polyamide resin (B) forms sea component,

(3) diameter of island component is 0.001 μ m～2 μ m.

28, the manufacture method of crimped yarn, it is characterized in that, use the curling processing unit (plant) of direct spinning stretching, as the core composition, as the sheath composition, utilize the spinning head squit hole to make it converge ejection with aliphatic polyester resin (A) with thermoplastic polyamide resin (B), form thus and spin silk, with 2～5 times of the comprehensive stretching ratios described silks that spin that stretch, make the temperature of the final roller after the stretching be 160～220 ℃ and carry out heat setting, utilize air flow jetting stuffer box crimping processing unit (plant) to implement the processing of curling then.

29, the manufacture method of crimped yarn, it is characterized in that, use the curling processing unit (plant) of direct spinning stretching, with aliphatic polyester resin (A) is the core composition, with thermoplastic polyamide resin (B) is the sheath composition, the weight fraction that makes the core composition is 10～65 weight %, when utilizing the spinning head squit hole to make it converge ejection, select melt viscosity than (η b/ η is a) in the combination of 0.2～2 scope, making spinning temperature is Tmb～Tmb+30 ℃ with respect to thermoplastic polyamide resin's (B) fusing point Tmb, the ejection linear velocity that makes the spinning head squit hole is 1～20m/ minute, formation spins silk, with spinning head surface vertical lower 0.01～0.15m as the cooling starting point, use from wind speed 0.3～1m/ second perpendicular to the direction of the vertical direction on spinning head surface, the described silk that spins of the gas cooled that wind-warm syndrome is 15～25 ℃, obtain multifilament, after with 2～5 times of comprehensive stretching ratios described multifilament being carried out 2 sections stretchings, implement to curl and add man-hour, the draw roll that makes the 1st section is 50～90 ℃, the 2nd section draw roll is 90～150 ℃, final roll temperature after the stretching is 160～220 ℃, carry out heat setting, when being supplied in air flow jetting stuffer box crimping processing unit (plant), the nozzle temperature that makes described device is than high 5～100 ℃ temperature of final roll temperature after stretching, the processing of curling, form crimped yarn, contact and derive with drum cooler, batch with the speed that is lower than the final roller 10～30% after the stretching.

30, the manufacture method of crimped yarn, it is characterized in that, use the curling processing unit (plant) of direct spinning stretching, with aliphatic polyester resin (A) and thermoplastic polyamide resin (B) as the core composition, make core composition and sheath composition converge ejection with spinning-nozzle, described core composition is made of polyblend, described polyblend is to utilize twin shaft to extrude mixing roll and/or single shaft is extruded mixing roll, at melting temperature is that fusing point (Tmb)～Tmb+40 ℃ of thermoplastic polyamide resin (B), shear rate are 200～20,00sec ^-1, the holdup time is that melting mixing aliphatic polyester resin (A) and thermoplastic polyamide resin (B) obtain under 0.5～30 minute the condition of scope, described sheath composition is made of thermoplastic polyamide resin (B).

31, a kind of fiber construct contains the described crimped yarn of claim 1 to small part.

32, fiber construct as claimed in claim 31, described fiber construct is a carpet.

33, fiber construct as claimed in claim 32, described fiber construct are the automobile inside carpets.

Images