CN101790602B - Partly oriented core-sheath polyester composite fiber, cheese-form package, and false-twisted fiber - Google Patents

Abstract

A partly oriented fiber giving a package which changes little in shape with time even through practically necessary long-term storage in a stockroom. The fiber has satisfactory suitability for false twisting and combines stability in dyeing with soft feeling. It is suitable for mass production. Also provided is a cheese-form package. The fiber is a partly oriented core-sheath polyester composite fiber constituted of a polylactic acid as a core component and polytrimethylene terephthalate as a sheath component, and is characterized by satisfying the following requirements (1) to (3). (1) Elongation: 60-130% (2) 70 DEG C-water shrinkage: 0.5-7.0% (3) Initial tensile resistance: 20-40 cN/dtex.

Description

Partly oriented core-sheath polyester composite fiber and cheese-form package and false-twisted fiber

Technical field

The present invention relates in false twisting processing, have concurrently the stability of good processability, dyeing and the false-twisted fiber that is suitable for mass-produced partly oriented core-sheath polyester composite fiber and cheese-form package and is suitable for making the cloth and silk of bulkiness, retractility excellence of soft feeling.

Background technology

Poly terephthalic acid Sanya methyl esters (below be sometimes referred to as PTT) is because when forming fiber, elongation recovery height and initial tensile strength are low, have the excellent characteristic of flexibility.And, because it is its chromatophilia,, in vogue to its research as the polyester fiber with glamour of the shortcoming that can remedy PETG (below be sometimes referred to as PET) fiber.

Through this ptt fiber being carried out false twisting processing, flexibility further improves, and is in vogue to the research of the part directional fiber that is suitable for false twisting processing.PTT part directional fiber (below be sometimes referred to as PTT-POY) because that it shrinks is big, exist rerum natura pass in time and change, problems such as package shape variation, false twisting poor in processability when forming cheese-form package, particularly this shortcoming has been carried out a lot of researchs.

For example, the method that has proposed to batch when cooling off to be to keep cheese-form package well, makes false twisting processability improve (for example with reference to patent documentation 1).But, though utilize this method cheese-form package to keep good shape to a certain extent, must cool off, therefore obtain package after, be placed to room temperature, through the time change and increase, the slow variation of package can not be practical.Therefore, proposed when obtaining the part directional fiber, to implement heat treatment, improved the crystallization degree, reduced the method (for example with reference to patent documentation 2) of batching after the thermal contraction.By this method, though the package shape improves tremendously, the false twisting processability also improves; But consider under the practical situation, when preserving under the long-term room temperature, package shape variation; Then distinguished false twisting processability variation in 3 months if in the warehouse, preserve, existing problems when producing in a large number.In addition, the equipment of production part directional fiber needs Equipment for Heating Processing, and existence can not be used the production equipment of the PET fiber that need not heat-treat in the past, the problem that is necessary to carry out equipment investment when producing in a large number

On the other hand, the fiber for PLA (below be sometimes referred to as PLA) and polyester are composited has proposed the core sheath composite fibre (for example with reference to patent documentation 4) as the sheath composition with PTT.But, in this motion, be purpose with mar proof, the moisture-proof pyrolytic that improves as the shortcoming of PLA, and, do not refer to the problem that solves PTT part directional fiber for being the fiber of main body with PLA, so very poor aspect flexibility.Though mention among the embodiment with PTT as the sheath composition, with the core sheath composite fibre of PLA as the core composition, be the silk that stretches, unresolved as the problem that relates to long preservation of the distinctive problem of PTT-POY or the problem of false twisting processing.

As stated; Expectation utilize flexibility as the PTT advantage, as shortcoming through the time change part directional fiber that is inhibited and the false-twisted fiber that is used to obtain the good cloth and silk of quality; Though this is studied, is not proposed otherwise effective technique in practicality.

Patent documentation 1: TOHKEMY 2001-254226 communique (Patent right requirement book)

Patent documentation 2: TOHKEMY 2001-020136 communique (Patent right requirement book)

Patent documentation 3: TOHKEMY 2003-129328 communique (Patent right requirement book)

Patent documentation 4: TOHKEMY 2004-353161 communique (Patent right requirement book, embodiment)

Summary of the invention

The objective of the invention is to solve above-mentioned problem in the past; Preserve even provide through practical essential long-term warehouse; The package shape through the time change also little; False twisting processing is good, so have concurrently dyeing stability, soft feeling be suitable for mass-produced part directional fiber and cheese-form package, and then the false-twisted fiber that is suitable for making bulkiness, cloth and silk that retractility is excellent is provided.

The present invention adopts following scheme in order to reach above-mentioned purpose.Promptly; Partly oriented core-sheath polyester composite fiber of the present invention; Be that the core composition is that PLA, sheath composition are the core sheath composite fibre that poly terephthalic acid Sanya methyl esters constitutes; It is characterized in that percentage elongation is that 60～130%, 70 ℃ of warm water shrinkage factors are 0.5～7.0%, initial tensile strength is 20～40cN/dtex.

In the above-mentioned core-sheath polyester composite fibre, the weight average molecular weight of preferred PLA is 200,000～300,000, compound ratio is 20～50wt%.

In addition; Cheese-form package of the present invention is characterised in that; Above-mentioned partly oriented core-sheath polyester composite fiber batched form; And behind the coiling package, the chimb (bulge) of in 35 ℃, the atmosphere gas of 60%RH, measuring the cheese-form package that obtains after through 90 days preservation for-5～5%, saddle (saddle) is 0～5%.

Further; False-twisted fiber of the present invention; Be that the core composition is that PLA, sheath composition are the core sheath composit false twisting processing fiber that poly terephthalic acid Sanya methyl esters constitutes; It is characterized in that vertically the CV% of continuous damp and hot shrinkage factor is 0～5%, initial tensile strength is that 20～40cN/dtex, flexible recovery rate are 25～60%.

Prior art is unconsummated preserves through practical essential long-term warehouse even the present invention can provide; The package shape through the time change also little; False twisting processing is good, so have concurrently dyeing stability, soft feeling be suitable for mass-produced partly oriented core-sheath polyester composite fiber and cheese-form package.Further, can provide that can to make bulkiness, retractility, flexibility excellent, the false-twisted fiber of the cloth and silk of stay in grade.In addition, the present invention can provide partly oriented core-sheath polyester composite fiber and cheese-form package and false-twisted fiber with respect to environment through using the PLA as the plant origin raw material, a part of PTT as the plant origin raw material.

Description of drawings

[Fig. 1] is for to package with as the chimb of the index of package form and the sketch map that saddle describes.

[Fig. 2] is the figure of an example of the preferred throwing equipment of expression core sheath composite portion directional fiber.

[Fig. 3] is the figure of the throwing equipment of the core sheath composite fibre made in the simple PTT part directional fiber made in the expression comparative example 5 and the comparative example 9～10.

Symbol description

1: nozzle

2: cooling device

3: oiling device

4: the first rollers

5: the second rollers

6: touch roll

7: package

8: the first warm-up mills

9: the second warm-up mills

The specific embodiment

Below the present invention is carried out bright specifically.

Part directional fiber of the present invention is a core sheath composite fibre, the core composition by PLA (PLA) form, the sheath composition forms by poly terephthalic acid Sanya methyl esters (PTT).In order to bring into play and the equal performance of its part directional fiber that is all formed by PTT (simple ptt fiber) (below be sometimes referred to as simple PTT part directional fiber), core sheath complex morphological is preferably concentric circles.Through being concentric circles, the part directional fiber forms does not have the straight fiber that curls, and therefore, can carry out and the simple equal processing of PTT part directional fiber.

The core composition of part directional fiber of the present invention is PLA.As the PLA that uses among the present invention, be that 90 moles of % are above with-(O-CHCH ₃-CO) _n-as the polymer of repetitive, for what lactic acid or its oligomer were polymerized.But, also can add following copolymer composition of 10 moles of % or multi-functional compounds etc.As copolymer composition, be preferably the aliphatic compound of easily biological-degradable biologically, dihydroxylic alcohols such as ethylene glycol, butanediol, hexylene glycol, ethohexadiol for example, aliphatic lactones such as butanedioic acid, hydroxy alkyl carboxylic acid, pivalolactone, caprolactone.As the multi-functional compounds, can utilize reactions such as making glycerine, pentaerythrite, trimellitic acid, PMA, in polymer, form suitable side chain or the weak crosslinked compound that forms.Further, can also add inorganic particulates such as titanium dioxide, but if consider as the core composition and use, then not add inorganic particulate such as titanium dioxide and obtaining aspect the stable composite form most preferably.Lactic acid is owing to exist 2 kinds of optical isomers of D-lactic acid and L-lactic acid, and its polymer has and only contains gathering (D-lactic acid) and only containing the PLA that gathers (L-lactic acid) and contain both of L body of D body.Along with the optical purity step-down of D-lactic acid in the PLA or L-lactic acid, crystallinity reduces, and fusing point reduces and increases.Therefore, in order to improve heat resistance, preferred optical purity is more than 90%.Preferred optical purity is more than 93%, and further preferred optical purity is more than 97%.And, find that optical purity has strong relevantly with fusing point as stated, when optical purity was 90% left and right sides, fusing point was about 150 ℃, and optical purity is 93% o'clock, and fusing point is about 160 ℃, and optical purity is 97% o'clock, fusing point is about 170 ℃.

In addition; If the different ground of system that merely mix with 2 kinds of optical isomers as stated; After above-mentioned 2 kinds of optical isomer fusion and being shaped to fiber, implement the high-temperature heat treatment more than 140 ℃, form the racemic crystallization and the stereoscopic composite that obtains; Then can improve fusing point, so more preferably tremendously.In addition, can use weight average molecular weight is 100,000～300,000 PLA, but weight average molecular weight and the part directional fiber that obtains through the time change relevant, through using the PLA 200,000 or more, through the time inhibition effect raising that changes, so preferably.In addition,, can guarantee flexibility, so preferred through being below 300,000.Through adopting PLA as the core composition, the contraction of part directional fiber is inhibited, through the time change minimum, can suppress as the shortcoming of in the past simple PTT part directional fiber through the time after the variation of false twisting processability.For the PTT part directional fiber that obtains that batches after the heat treatment that passes through as in the past technology; Really can suppress contraction to a certain degree; But can not suppress through the time change to practical level, through the time after package form variation, can not solve the problems such as quality reduction of false twist yarn.But the shrinkage character that when finding to utilize simple PLA, simple PTT, can never reduce is compound and can significantly suppress aspect the contraction through PLA and PTT, and is of the present invention significant.Further, PLA is because for through being made the polymer of the lactic acid preparation that sugar fermentation obtains by the plant that with the corn is representative, not with oil as raw material, be the very preferred polymer of the viewpoint that meets the carbon neutralization.Compound this PLA significant.

On the other hand, the sheath composition is PTT.As the PTT that uses among the present invention, for terephthalic acid (TPA) as main sour composition, with 1, the polyester that ammediol obtains as main glycol component.PTT preferably comprises the 90 moles of above terephthalic acid (TPA) of % Sanya methyl esters repetitives.But, also can contain other copolymer composition with 10 moles of ratios below the %.As compound that can copolymerization; For example can enumerate; Omega-dicarboxylic acids such as M-phthalic acid, butanedioic acid, cyclohexane cyclohexanedimethanodibasic, adipic acid, dimeric dibasic acid, decanedioic acid, 5-sodium sulfo isophthalate; Di-alcohols such as ethylene glycol, diethylene glycol (DEG), butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, polypropylene glycol, but be not limited thereto.In addition, as required, can also add titanium dioxide as delustering agent, as the silicon dioxide microparticle of lubricant or alumina particulate, as the hindered phenol derivative of anti-oxidant, coloring pigment etc.In addition, easy and preferred if the inherent viscosity of PTT is 0.8～1.2 fibration.

Then the rerum natura to part directional fiber of the present invention describes.At first, percentage elongation is 60～130%.Through making percentage elongation is more than 60%, does not implement heat treatment in the throwing step and just can suppress to shrink, and the false twisting processability improves.Preferred percentage elongation is more than 65%, and preferred percentage elongation is more than 80%, further to be preferably more than 90%.In addition through being below 130%, can suppress through the time change, even long preservation also can be kept good false twisting processability.Be preferably below 125%, further be preferably below 120%.Percentage elongation owing to be not attended by stretching, can be adjusted through spinning speed under the situation of part directional fiber.Different according to the polymer that uses, even same spinning speed, percentage elongation is also different, but through make spinning speed be more than 2600m/ minute～below the 3700m/ minute, obtain percentage elongation of the present invention easily.

Then, 70 ℃ of warm water shrinkage factors are 0.5～7%.If 70 ℃ of warm water shrinkage factors are more than 0.5%, then give when hot, shrink significantly and can not extend, therefore can likewise handle with the PET fiber.In addition, if even 7% with next through the long preservation in the warehouse, also can suppress the variation of package, it is also good that false twisting adds the processability in man-hour.Preferred 70 ℃ of warm water shrinkage factors are below 6%, further to be preferably below 3%.70 ℃ of warm water shrinkage factors are mainly by spinning speed, decide as compound ratio, heat treated the having or not of the PLA of core polymer.For the percentage elongation that obtains stipulating, spinning speed is preferably more than above-mentioned 2600m/ minute～and below the 3700m/ minute, 70 ℃ of warm water shrinkage factors have the trend that uprises if spinning speed improves then.For simple PTT part directional fiber, even set under the situation of low spinning speed, 70 ℃ of warm water shrinkage factors are also high, be more than 40%.Therefore, in the prior art, when obtaining the part directional fiber, implement heat treatment and reduce shrinkage factor.But, when utilizing this method, as stated, the false twisting processability variation after the long preservation.Therefore, among the present invention, forming with PTT is important as the sheath composition, with PLA as the core sheath composite portion directional fiber of core composition.Through compound PLA as the core composition; Even also can carry out stable false twisting processing after the long preservation; In addition the heat treatment in the time of also need not obtaining the part directional fiber can be continued to use the equipment of simple PET part directional fiber in the past, so is suitable for a large amount of productions.

The compound ratio of PLA more greatly then can reduce by 70 ℃ of warm water shrinkage factors more.If the compound ratio that 20wt% is above then reduces shrinkage factor easily, so preferred.The compound ratio of preferred PLA is more than the 30wt%.But, be necessary to note for the compound ratio of PLA.Core sheath composite portion directional fiber of the present invention can likewise be handled owing to can bring into play equal performance with simple PTT part directional fiber, and it is important can replacing, and therefore is necessary to keep the flexibility as the big characteristic of PTT.The flexibility of PTT can be represented with initial tensile strength, in following, describe, but in order to keep this flexibility, the compound ratio of preferred PLA is below the 50wt%, more preferably below the 45wt%, most preferably is below the 40wt%.

The initial tensile strength of part directional fiber of the present invention is 20～40cN/dtex.As stated, it is important can likewise using with simple PTT part directional fiber, is necessary to have concurrently the flexibility as the important characteristic of PTT.The initial tensile strength of simple PET part directional fiber is about 90cN/dtex, and therewith relatively, simple PTT part directional fiber is 20～40cN/dtex, if 40cN/dtex during with next formation cloth and silk, can bring into play sufficient flexibility.If the PTT part directional fiber that initial tensile strength is simple then can be reached, but as stated, owing to have the problem of the false twisting processability after the long preservation, so not preferred.With PLA is in the core sheath composite portion directional fiber of core composition, is below the 50wt% through the compound ratio that makes PLA, and making initial tensile strength is to become easy below the 40cN/dtex.Use PTT through the sheath composition, can reach and the simple same flexibility of PTT part directional fiber.Be preferably below the 34cN/dtex, more preferably below the 32cN/dtex.

The intensity of part directional fiber of the present invention, be set in obtain no problem on the cloth and silk scope in get final product.For intensity, if then preferred more than the 1.5cN/dtex owing to be difficult for to produce fracture of wire that false twisting adds man-hour.In addition,, obtain the percentage elongation of the present invention's regulation easily, so preferred through being below the 3.1cN/dtex.

Polyester fiber of the present invention batches on paper tube etc., supplies with the mode of cheese-form package shown in Figure 1.The shape of this cheese-form package, preferred chimb for-5～5% and saddle be 0～5%.As shown in Figure 1, maximum gauge (Dmax), minimum diameter (Dmin), Breadth Maximum (Wmax) and the minimum widith (Wmin) of package are measured, calculate saddle and chimb through following formula.

Saddle (%)=(Dmax-Dmin)/Dmin} * 100

Chimb (%)=(Wmax-Wmin)/Wmin} * 100

And this saddle, chimb must be represented the shape after the long preservation, are to batch to after the package, in 35 ℃, the atmosphere gas of 60%RH, measure after through 90 days preservation to obtain.

If the hardness of the fiber in the big then package of saddle or chimb produces uneven.When particularly saddle was big, fiber was hard in the part of maximum gauge, and in the part of minimum diameter, fiber is prone to deliquescing on the contrary.If the hardness of fiber exists uneven, then to use it to carry out false twisting and add man-hour, machine tensions produces change, produces fracture of wire, and the dyeing of the processing silk that in addition obtains produces uneven, and the homogeneity of cloth and silk is impaired and quality reduces.If saddle and chimb in above-mentioned scope then the inequality of the fiber of package be inhibited, processability improves, the quality reduction on the cloth and silk surface that in addition can suppress to produce.The preferred scope of chimb is-4～4%, and the preferred scope of saddle is 0～3%.

In order to make saddle and chimb in preferred range; Usually through making tension force when batching in suitable scope; Can make the package shape after just having batched good; In the simple PTT part directional fiber, just batched the back no problem, but if through 35 ℃ of long preservation down variation and be difficult to keep well then.Among the present invention,,, also can obtain good package even after the long preservation through forming with PLA as the core composition, with the core sheath composite portion directional fiber of PTT as the sheath composition.And, if compound ratio 20～50wt% of PLA then can obtain good package shape.

Further, in addition, the delay shrinkage factor of the core sheath composite portion directional fiber that is obtained by package is preferably 0～1.8%.Wherein, postpone shrinkage factor and be to get behind the coiling package 15 minutes, make to apply 5.4 * 10 with interior part directional fiber 1m ^-3Length during the load of cN/dtex is L3, makes in 25 ℃, the atmosphere gas of 60%RH, 5.4 * 10 ^-3The length of load held after 48 hours of cN/dtex is L4, calculates with following formula.

Delay shrinkage factor (%)=(L3-L4)/L3} * 100

To postpone shrinkage factor is below 1.8% by making, and behind the coiling package, can easily suppress the rolling-in (volume is formed) of package, easily the repression of swelling rate through the time rate of change.Preferred delay shrinkage factor is below 1.5%.

Then the preferable production process to core sheath composite portion directional fiber of the present invention describes.

The step of this method comprises the step of step, the fusion PLA of fusion PTT, spue 2 kinds of molten polymers for the step of core sheath shape, with the polymer at interflow at the nozzle interflow from nozzle step, the polymer that traction spues and the fiber of non-stretching and drawing batch the step into cheese-form package with it.This method can be identical with the method that obtains simple PET part directional fiber in the past.Since identical, can cheaply in a large number produce, so preferred.Therefore the essential heat treatment step of simple PTT part directional fiber in the past can not use the equipment of simple PET part directional fiber.

But PTT preferably carries out fusion, spinning with alap temperature because hot deterioration is compared with PET seriously.Preferred temperature is 235～250 ℃.On the other hand, PLA is because fusing point is lower, and the preferred temperature of fusion, spinning is 190～245 ℃.In order to suppress both deteriorations, preferably set the short as far as possible melting time.Therefore fusion is preferably carried out through extruder.In addition, fusion, spinning separate to come design temperature with PTT with PLA, most preferably are 240～265 ℃, 190～220 ℃ respectively.

False-twisted fiber for another invention of the present invention; Be that the core composition is that PLA, sheath composition are the core sheath composit false twisting processing fiber of PTT, vertically the CV% of continuous damp and hot shrinkage factor is 0～5%, initial tensile strength is that 20～40cN/dtex, flexible recovery rate are 25～60%.

PLA is that 90 moles of % are above with-(O-CHCH as stated ₃-CO) _n-as the polymer of repetitive, for what lactic acid or its oligomer were polymerized.But, also can add following copolymer composition of 10 moles of % or multi-functional compounds etc.Further, can also add inorganic particulates such as titanium dioxide, but if consider as the core composition and use, then not add inorganic particulate such as titanium dioxide and obtaining aspect the stable composite form most preferably.Lactic acid is owing to exist 2 kinds of optical isomers of D-lactic acid and L-lactic acid, and its polymer has and only contains gathering (D-lactic acid) and only containing the PLA that gathers (L-lactic acid) and contain both of L body of D body.Along with the optical purity step-down of D-lactic acid in the PLA or L-lactic acid, crystallinity reduces, and fusing point reduces and increases.Therefore, in order to improve heat resistance, preferred optical purity is more than 90%.Preferred optical purity is more than 93%, and further preferred optical purity is more than 97%.And optical purity finds have strong relevantly with fusing point as stated, and when optical purity was 90% left and right sides, fusing point was about 150 ℃, and optical purity is 93% o'clock, and fusing point is about 160 ℃, and optical purity is 97% o'clock, and fusing point is about 170 ℃.

In addition; If the different ground of system that merely mix with 2 kinds of optical isomers as stated; After above-mentioned 2 kinds of optical isomer fusion and being shaped to fiber, implement the high-temperature heat treatment more than 140 ℃, form the racemic crystallization and the stereoscopic composite that obtains; Then can improve fusing point, so more preferably tremendously.In addition; Can use weight average molecular weight is 100,000～300,000 PLA, but there is relation in the heat endurance of weight average molecular weight and the false-twisted fiber that obtains, through using the PLA more than 200,000; So the inhibition effect of vertical continuous damp and hot shrinkage factor of stating after the raising is preferred.In addition,, can guarantee flexibility, so preferred through being below 300,000.Through adopting PLA as the core composition, make the contraction stabilisation of false-twisted fiber, can improve the shortcoming of simple PTT false-twisted fiber in the past.In addition, compound through suitably carrying out the core sheath, keep high flexible recovery rate in the time of the initial tensile strength stated after keeping easily.Preferred compound ratio is more than the 20wt%, satisfies the stability and the retractility of shrinking thus easily.Be preferably more than the 30wt%.In addition,, can also make flexibility identical, so preferred with simple PTT false-twisted fiber if 50wt% not only keeps high flexible recovery rate with next.More preferably below the 45wt%.About flexible recovery rate, with respect to the compound ratio of PLA, be convex relation, through being that 20～50wt% can easily obtain high flexible recovery rate.When utilizing in the past technological, all these PTT false-twisted fibers that is not being met can not obtain having concurrently the cloth and silk of flexibility, bulkiness, retractility in practicality.Further, PLA is because for through being made the polymer of the lactic acid preparation that sugar fermentation obtains by the plant that with the corn is representative, not with oil as raw material, be the very preferred polymer of the viewpoint that meets the carbon neutralization.Compound this PLA significant.

On the other hand, the sheath composition is PTT.As the PTT that uses among the present invention, for terephthalic acid (TPA) as main sour composition, with 1, the polyester that ammediol obtains as main glycol component.PTT preferably contains the 90 moles of above terephthalic acid (TPA) of % Sanya methyl esters repetitives.But, also can contain other copolymer composition with 10 moles of ratios below the %.In addition, as required, can also add titanium dioxide as delustering agent, as the silicon dioxide microparticle of lubricant or alumina particulate, as the hindered phenol derivative of anti-oxidant, coloring pigment etc.In addition, if being 0.8～1.2, the inherent viscosity of PTT carries out false twisting processing easily and preferred.

In order to obtain false-twisted fiber of the present invention, most preferably use the part directional fiber of the invention described above.This be because; When part directional fiber of the present invention is kept flexibility, low as the contraction of part directional fiber, be suitable percentage elongation; And through the time change minimum; Even so through practical preservation of in the inevitable warehouse, also can easily carry out false twisting processing, can be so that the flexibility of the false-twisted fiber that arrives, bulkiness, retractility and then contraction stabilisation.

Vertically the CV% of continuous damp and hot shrinkage factor for after the CV% of 100 ℃ of damp and hot shrinkage factors calculating of the assay method stated.Vertically the CV% of continuous damp and hot shrinkage factor be promptly mean below 5% the variation of shrinking big, package form, these through the time contraction inequality that produces in changing little, because of concavo-convex, flexibility, the flatness of shrinking the cloth and silk that caused good.In the core sheath composit false twisting processing fiber of compound PLA as core, can suppress to become in the simple PTT false-twisted fiber in the past the variation of the CV% of the vertical continuous damp and hot shrinkage factor after the long preservation of problem, with the obvious advantage aspect this.And the preferred vertically CV% of continuous damp and hot shrinkage factor below 4%, most preferably is below 3.5%.In order to suppress the vertically CV% of continuous damp and hot shrinkage factor, making the weight average molecular weight of the PLA that uses as the core composition is to be effective more than 200,000.Further; Processing multiplying power through making false twisting processing is 1.2 times, preferred more than 1.3 times when the percentage elongation of part directional fiber is 70% left and right sides; When percentage elongation is 100% left and right sides be more than 1.3 times, preferred more than 1.4 times; When percentage elongation is 120% left and right sides be more than 1.45 times, preferred more than 1.5 times, suppress to become easy.If the percentage elongation of the part directional fiber that uses is 65% and can keeps processing multiplying power, so preferred.

For initial tensile strength, it is important that core sheath composit false twisting processing fiber of the present invention can likewise use with simple PTT false-twisted fiber, is necessary to have concurrently the flexibility as the key property of PTT.The initial tensile strength of simple PET false-twisted fiber is about 90cN/dtex, and therewith relatively, simple PTT false-twisted fiber is 20～40cN/dtex, if 40cN/dtex during with next formation cloth and silk, can bring into play sufficient flexibility.If the PTT false-twisted fiber that initial tensile strength is simple then can be reached, but owing to have the problem of the CV% variation of the vertical continuous damp and hot shrinkage factor after the long preservation, so not preferred.In the core sheath composit false twisting processing fiber of PLA as the core composition, be below the 50wt% through the compound ratio that makes PLA, making initial tensile strength is to be easy below the 40cN/dtex.This epitheca composition uses PTT.Can reach the flexibility same thus with simple PTT false-twisted fiber.Be preferably below the 34cN/dtex, more preferably below the 32cN/dtex.

The evaluation of the recovery rate of stretching for the recovery (ヘ タ リ) of false twist crimping is carried out, value Gao Zeyue more have the curling or bulkiness of the binding force of revolting when forming cloth and silk.Through making flexible recovery rate is more than 25%, can obtain the good cloth and silk of bulkiness or flexibility.Through obtaining false-twisted fiber, obtain the flexible high fiber of recovery rate easily by the core sheath composite portion directional fiber that is combined with PLA in the core.Think this be because, because the fusing point of PLA is low, adds through false twisting and give heat man-hour, make polymer softening easily, can give curlingly, and can not damage the flexibility of PTT.If the weight average molecular weight of PLA is then this effect raising more than 200,000, if flexible recovery rate is then to obtain further good cloth and silk more than 30%.Most preferably be more than 35%.In addition, be below 60% through making flexible recovery rate, can obtain soft cloth and silk, and can not damage the flexibility of PTT.Usually known high flexible recovery rate causes thick and stiffization of cloth and silk; But through making the weight average molecular weight that is engaged in the PLA in the core is more than 200,000; Even flexible recovery rate is high, also can in the scope of the flexibility of not damaging PTT, carry out false twisting processing, so preferred especially.

False twisting processing can adopt known pin mode, friction mode, band to press mode methods such as (belt nip-type).The draw false twisting processing machine that under the situation of friction mode, can be 100～160 ℃ for use has false twisting heater (primary heater) temperature as an example,, be preferably 100～150 ℃ direct contact heater is processed.And then the use secondary heater, be reduced in the moment of torsion of the processing silk of heat setting in the primary heater, obtain the false twisting processing of so-called two heaters of the low torque silk of low crimpiness.At this moment, secondary heater can be contact or contactless, and the secondary heater temperature is 100～150 ℃, is preferably 100～140 ℃.In addition, process velocity is generally 400～800m/ minute, and the false twisting instrument is that polyurethane dish, the ceramic dish that is coated with etc. are suitable.The processing multiplying power is different and different according to the percentage elongation of the part directional fiber that uses; But the part directional fiber as if for percentage elongation being about 70% is more than 1.2 times, is preferably more than 1.3 times, under about 100% the situation; Be more than 1.3 times, be preferably more than 1.4 times; Percentage elongation is under about 120% the situation, to be more than 1.45 times, to be preferably more than 1.5 times, then owing to be engaged in the orientation of the PLA in the core and improve; Not only suppress vertically the CV% of shrinkage factor continuously easily, and improve flexible recovery rate easily.In addition, the ratio of the peripheral speed D of false twisting instrument and process velocity Y (below be sometimes referred to as D/Y than) is 1.4～1.8, is preferably 1.5～1.8, can improve flexible recovery rate thus.In the false-twisted fiber of the present invention of the core sheath structure of the combination of PLA and PTT, keep the performance height through what give mechanicalness, hot the curling of realizing of curling, indifferent recovery, so particularly be prone to keep flexible recovery rate.

Core sheath composit false twisting processing fiber of the present invention is master's a braided fabric through forming with the dress material purposes, can obtain having concurrently the cloth and silk of flexibility and good quality, can provide to suppress the dress material that shrinks because of the heat of drying machine etc.Particularly use as automobile interior materials, even because under the environment in the vehicle of harshness, through the time change also very for a short time, can tolerate, thus preferred owing to can help the propelling of the carbon neutralization of automobile industry, so preferred.

Embodiment

Below enumerating embodiment carries out bright specifically.And the main measured value of embodiment is measured through following method.

(1) inherent viscosity

Inherent viscosity [η] for using o-chlorphenol as solvent, is measured viscosity down at 30 ℃, the value of trying to achieve based on following definition.Wherein, C is the concentration of solution, and η r is relative viscosity (ratio of the viscosity of the solution of certain concentration C and the viscosity of solvent)

[several 1]

$\left[\mathrm{\η}\right]=\underset{c\→0}{\lim }\frac{(\mathrm{\ηr}-1)}{c}$

(2) weight average molecular weight

Using Waters corporate system gel permeation chromatography 2690, is that standard is measured with the polystyrene.And condition determination is described below.

Solvent: chloroform (using) with light, HPLC

Temperature: 40 ℃

Flow velocity: 1ml/ minute

Sample concentration: 10mg/4ml

Filter: Maishori-disk 0.5 μ-TOSOH

Injector: 200 μ l

Detector: differential refractometer RI (Waters2410)

Standard items: polystyrene (concentration: sample 0.15mg/ solvent 1ml)

Minute: 40 minutes

(3) intensity, percentage elongation, initial tensile strength

Measure according to JIS L1013 (1999).Intensity and percentage elongation be according to (1999) 8.5 of JISL1013 " TENSILE STRENGTH and percentage elongation ", clamping at interval 20cm, draw speed 50%/minute under measure.Initial tensile strength is according to (1999) 8.10 of JIS L1013, clamping at interval 20cm, draw speed 50%/minute under measure.And working sample use to obtain after the package through 12 hours～48 hours with interior unconverted sample.In addition, in the mensuration of false-twisted fiber, the initial stage load is 0.088cN/dtex.

(4) 70 ℃ of warm water shrinkage factors

With fiber with 1m * 10 time skeining.Pair twist applies 29 * 10 ^-3The load of cN/dtex, making the strand length of this moment is L0, applies 0.29 * 10 at pair twist ^-3The state of the load of cN/dtex is down with 70 ℃ warm water processing 10 minutes, air-dry more than 12 hours～and 24 hours with after interior, applies 29 * 10 ^-3The load of cN/dtex, making the strand length of this moment is L1, calculates 70 ℃ of warm water shrinkage factors through following formula.

70 ℃ of warm water shrinkage factors (%)=(L0-L1)/L0} * 100

And, working sample use to obtain after the package through more than 12 hours～48 hours with interior unconverted sample.

(5) saddle of package, chimb

In each embodiment and comparative example, during the reel-up directional fiber, batch on the paper tube of diameter 134mm with reeling width 114mm, obtain the package (coil diameter is about 340mm) of 8kg.After being wrapped in of obtaining placed 90 days in 35 ℃, the atmosphere gas of 60%RH, measure the shape of package.As shown in Figure 1, maximum gauge (Dmax), minimum diameter (Dmin), Breadth Maximum (Wmax) and the minimum widith (Wmin) of package are measured, calculate saddle and chimb through following formula.First of decimal rounded up obtain integer value.

Saddle (%)=(Dmax-Dmin)/Dmin} * 100

Chimb (%)=(Wmax-Wmin)/Wmin} * 100

(6) postpone shrinkage factor

Get behind the 1m coiling package 15 minutes with interior part directional fiber, apply 5.4 * 10 ^-3Length during the load of cN/dtex is L3, in 25 ℃, the atmosphere gas of 60%RH, 5.4 * 10 ^-3The length of load held after 48 hours of cN/dtex is L4, calculates with following formula.Second decimal place rounded up obtain the primary numerical value of decimal.

Delay shrinkage factor (%)=(L3-L4)/L3} * 100

(7) false-twisted fiber full packages rate

Using core-sheath composite partially oriented fibers 8kg of rolls through polyurethane disc rubbing way false twisting (Neila false twist (イ nn cloth ro one in progress twist), processing speed 400m / min, adjust draw ratio to make false twisting fibers elongation of 40%, a first heater temperature 145 ℃, a second heater temperature 130 ℃).Get 4 of the false-twisted fibers of 2kg volume, cutting apart false twisting by 100 core sheath composite portion directional fibers is 400 false-twisted fibers.Calculate in 400 false-twisted fibers fracture of wire not and can get the ratio of the false-twisted fiber of 2kg.First of decimal rounded up obtain integer value.And the core sheath composite portion directional fiber of use uses in 35 ℃, the atmosphere gas of 60%RH and preserves 90 days core sheath composite portion directional fiber.

(8) false-twisted fiber is compiled inspection

4 false-twisted fibers that use in the false-twisted fiber that obtains in (7) the core sheath composite portion directional fiber by package arbitrarily to obtain are made 28 plane No. circular webs, in the colouring method; As dyestuff; Use テ ト ラ シ one Le ネ イ PVC one Block Le one SGL 0.275%owf,, use and just grinding chemical industry (strain) system テ ト ロ シ Application PE-C 5.0%owf as auxiliary agent; As dispersant; Use solar corona chemistry (strain) system ニ Star カ サ Application ソ Le ト #1200 1.0%owf, with bath raio 1: 100 50 ℃ of dyeing 15 minutes, and then 90 ℃ of dyeing 20 minutes down.For the sample of accomplishing dyeing, the dyeing difference between, strand uneven for dyeing carries out comprehensive evaluation, and can to going on the market as goods, 3 grade evaluations be carried out in the negotiation that the estimator through having experience more than 3 years is 3.Qualified level is more than the △.

Zero: unusual homogeneous is the quality of excellence

△: be stable quality, can go on the market

*: the significant deficiency that existence can not be gone on the market

(9) flexibility

28 plane No. circular webs for obtaining in (8) carry out the contact skin organoleptic test, and 2 grade evaluations are carried out in the negotiation that the estimator through having experience more than 3 years is 3.Qualified level is zero.

Zero: very excellent

*: hard

(10) overall merit of part directional fiber

Implement (7), (8), (9) evaluation, implement overall merit.The full packages rate of false-twisted fiber is qualified more than 95%, and it is qualified that false-twisted fiber is compiled inspection △ above, and flexibility zero is qualified, and all qualified levels are that overall merit is qualified, are designated as zero.In above-mentioned 3 kinds of evaluations, though a kind of evaluation defective also be that overall merit is defective, be designated as *.

(11) CV% of vertical continuous damp and hot shrinkage factor

For false-twisted fiber, use eastern レ エ Application ジ ニ ア リ Application グ system FTA-500, giving silk speed 10m/ minute, measure filament length 30m, give thread tension 20gf, measure continuously under 100 ℃ of the damp and hot temperature 100 ℃ of shrinkage factors under damp and hot, try to achieve its CV% value.Second decimal place rounded up ask to first of decimal.

(12) flexible recovery rate

False-twisted fiber with 1m * 10 time skeining, was being handled 15 minutes air-dry then 24 hours in 100 ℃ boiling water under the uncharge state.For heat treated sample, according to (1999) 8.13 of JISL1013 " flexible recovery rate ", in water, apply the load of 0.00176cN/dtex and the load of 0.0882cN/dtex, measure the strand length L 0 after 2 minutes.Then, in water, the load of removal 0.0882cN/dtex only applies the load of 0.00176cN/dtex, measures the strand length L 1 after 2 minutes.Calculate flexible recovery rate through following formula.First of decimal rounded up as integer value.

(flexible recovery rate)=(L0-L1)/L0 * 100 (%)

(13) draftability

Likewise make 28 plane No. circular webs with the inspection of the volume of (8) false-twisted fiber, its draftability is carried out the organoleptic test, 3 grade evaluations are carried out in the negotiation that the estimator through having experience more than 3 years is 3.Qualified level is more than the △.

Zero:, restorative also good for homogeneous and excellent draftability

△: be the draftability of homogeneous, though the hole of residual a little circular web, in practicality in the scope of no problem

*: draftability is not enough, and the stretching vestige is residual

(14) overall merit of false-twisted fiber

Except the volume inspection of the false-twisted fiber of (8), (9) flexibility, also implement the evaluation of draftability, all qualified levels are that overall merit is qualified, are designated as zero.Even a kind of evaluation is defective also is that overall merit is defective, be designated as *.

Embodiment 1

As the core composition; Use that optical purity is 98.0%, weight average molecular weight is 21.4 ten thousand PLA (gathering-L-lactic acid), as the sheath composition, operating characteristic viscosity is 1.1 homopolymerization PTT; PLA under 190 ℃, PTT is in the fusion of 250 ℃ of following use extruders; Through pump metering so that the compound ratio of PLA is 30wt%, the compound ratio of PTT be 70wt% after, it is compound to carry out the core sheath at nozzle, under 240 ℃ temperature, spues.The polymer that spues is processed the part directional fiber with spinning machine shown in Figure 2.Under speed 2700m/ minute of first roller 4, draw,, under 2650m/ minute, batch, obtain cheese-form package 7 through behind second roller 5 of identical speed.And first roller 4, second roller 5 are not warm-up mills, but normal temperature.

The core sheath composite portion directional fiber that obtains shows good rerum natura, and percentage elongation is that 120%, 70 ℃ of warm water shrinkage factor is 1.8%, initial tensile strength is 29cN/dtex, postpone shrinkage factor is 0.6%.Being wrapped in of obtaining preserved the chimb and the saddle that record after 90 days in 35 ℃, 60%RH atmosphere gas also good.The full packages rate of false-twisted fiber finds no fault with, is 97% that volume is examined, flexibility is all good, and is very excellent.The result is as shown in table 1.

Embodiment 2～4

Except the compound ratio of change PLA as shown in table 1, the compound ratio of PTT, to obtain core sheath composite portion directional fiber with embodiment 1 identical step.As shown in table 1, obtain very excellent result.Particularly among the embodiment 4, the balance of all assessment items is good, obtains the 1 equal above good result with embodiment.

Embodiment 5

Except the weight average molecular weight that makes PLA is 16.5 ten thousand, to obtain core sheath composite portion directional fiber with embodiment 2 identical steps.Because the PLA molecular weight is low, 70 ℃ of warm water shrinkage factors are high slightly, therefore with headed by the package form, the volume inspection of false-twisted fiber can't wait embodiment 2, but obtains good result.

Comparative example 1～2

Except the compound ratio of change PLA as shown in table 1, the compound ratio of PTT, to obtain core sheath composite portion directional fiber with embodiment 1 identical step.The compound ratio of PLA is that the inhibition of 70 ℃ of warm water shrinkage factors is insufficient in 10% the comparative example 1, and chimb is also poor, obtains the result of poor in processability.In addition, the compound ratio of PLA is in 60% the comparative example 2, and initial tensile strength is high, be 48cN/dtex, only obtains the knitted fabric of flexibility difference.

Comparative example 3

Except the weight average molecular weight that makes PLA is 16.5 ten thousand, to obtain core sheath composite portion directional fiber with comparative example 2 identical steps.Because initial tensile strength is high, obtain the result of flexibility difference.

Comparative example 4

Operating characteristic viscosity is 1.1 homopolymerization PTT, and in the fusion of 250 ℃ of following use extruders, through after the pump metering, it is compound to carry out the core sheath at nozzle, under 240 ℃ temperature, spues.The polymer that spues is processed the part directional fiber with spinning machine shown in Figure 2.Under speed 2700m/ minute of first roller 4, draw,, under 2650m/ minute, batch, obtain cheese-form package 7 through behind second roller 5 of identical speed.And first roller 4, second roller 5 are not warm-up mills, but normal temperature.The part directional fiber that obtains, 70 ℃ of warm water shrinkage factors are very high, be 46%, and rate variance is shunk in chimb, saddle, delay, and false twisting processing full packages rate is 65%, and it is also poor to compile inspection, does not obtain good result.

Comparative example 5

Operating characteristic viscosity is 1.1 homopolymerization PTT, and in the fusion of 250 ℃ of following use extruders, through after the pump metering, it is compound to carry out the core sheath at nozzle, under 240 ℃ temperature, spues.The polymer that spues is processed the part directional fiber with spinning machine shown in Figure 3.The temperature of first warm-up mill 8 is set at 80 ℃, draws with speed 2700m/ minute, after being set at 120 ℃ second warm-up mill 9 of identical speed, under 2650m/ minute, batch, obtain cheese-form package 7.The part directional fiber that obtains shows good shrinkage factor, 70 ℃ of warm water shrinkage factors are 2.8%; The chimb of the package after just having batched, saddle are also good; But through 90 days preservation, the package variation, false twisting processing full packages rate is inadequate result, is 88%.As further comparison, do not preserve the part directional fiber of comparative example 5, carry out after 5 days can knowing after the false twisting processing that false twisting processing full packages rate is 96% in the acquisition package.Can know in the comparative example 5 false twisting processability reduction owing to long preservation.

Embodiment 6～8, comparative example 6～8

First roller 4 in change Fig. 2 as shown in table 1, the speed of second roller 5, the coiling speed, under the condition identical, obtain core sheath composite portion directional fiber with embodiment 1.Percentage elongation of the present invention; 70 ℃ of warm water shrinkage factors, initial tensile strength is among the saddle of package, the embodiment of chimb 6～8; Can obtain good false twisting processability, good knitted fabric; But percentage elongation is 143% comparative example 6, percentage elongation is that owing to think that unoriented amorphous fraction is many, the full packages rate of preserving the false twist yarn after 90 days is insufficient in 133% the comparative example 7.In addition, percentage elongation is in 52% the comparative example 8, can not suppress 70 ℃ of warm water shrinkage factors, preserves the chimb variation of the package after 90 days, very poor in processability.

Comparative example 9

As the core composition, operating characteristic viscosity is 0.5 homopolymerization PET, as the sheath composition; Operating characteristic viscosity is 1.1 homopolymerization PTT; PET is under 290 ℃, and PTT is in the fusion of 250 ℃ of following use extruders, through the pump metering so that the compound ratio of PET is 30wt%, the compound ratio of PTT be 70wt% after; It is compound to carry out the core sheath at nozzle, under 270 ℃ temperature, spues.The polymer that spues is processed the part directional fiber with spinning machine shown in Figure 3.The temperature of first warm-up mill 8 is set at 100 ℃, draws with speed 3000m/ minute, behind second warm-up mill 9 through the identical speed of non-heating, under 2960m/ minute, batch, obtain cheese-form package 7.

The core sheath composite portion directional fiber that obtains shows good rerum natura; Percentage elongation is that 125%, 70 ℃ of warm water shrinkage factor is 3.8%, initial tensile strength is 34cN/dtex, and saddle, the chimb of the package after just having batched are all good, but the preservation through 90 days; The package variation; False twisting processing full packages rate is inadequate result, is 93% that it is also defective to compile the inspection result, can not get gratifying false-twisted fiber.

Comparative example 10

As the core composition, operating characteristic viscosity is 0.5 homopolymerization PET, as the sheath composition; Operating characteristic viscosity is 1.1 homopolymerization PTT; PET is under 290 ℃, and PTT is in the fusion of 250 ℃ of following use extruders, through the pump metering so that the compound ratio of PET is 30wt%, the compound ratio of PTT be 70wt% after; It is compound to carry out the core sheath at nozzle, under 270 ℃ temperature, spues.The polymer that spues is processed the part directional fiber with spinning machine shown in Figure 3.The temperature of first warm-up mill 8 is set at 55 ℃, draws with speed 1600m/ minute, after second warm-up mill 9 of setting 150 ℃ of temperature, speed 3800m/ minute for stretches, under 3700m/ minute, batch, obtain cheese-form package 7.The core sheath composite fibre that obtains is owing to implement to stretch, and percentage elongation is that 58%, 70 ℃ of warm water shrinkage factor, initial tensile strength, saddle, chimb are all good, but can not obtain sufficient flexibility.

Embodiment 9

Use the part directional fiber that obtains among the embodiment 1, in 35 ℃, the atmosphere gas of 60%RH, preserve 90 days after, carry out friction mode false twisting processing (in draw false twisting) through the polyurethane dish.And, than 1.5, process under 130 ℃ of 145 ℃ of the primary heater temperature, secondary heater, obtain the false-twisted fiber of 84dtex-36 root monofilament process velocity 400m/ minute, processing 1.6 times of multiplying powers, D/Y.Vertically the CV% of continuous damp and hot shrinkage factor is 3.4%, initial tensile strength is that 28cN/dtex, flexible recovery rate are 35%, and is as shown in table 3, can obtain compiling all good cloth and silk of inspection, flexibility, draftability.

Embodiment 10～12

In order to observe the influence with the compound ratio of PLA,, use the part directional fiber of embodiment 4 as embodiment 10 for PTT; As embodiment 11, use the part directional fiber of embodiment 3, as embodiment 12; Use the part directional fiber of embodiment 2, use after in 35 ℃, the atmosphere gas of 60%RH, preserving 90 days respectively, in addition; Under the condition identical, implement false twisting processing, obtain false-twisted fiber with embodiment 9.Any embodiment can obtain good cloth and silk.Particularly among the embodiment 11, vertically the CV% of continuous damp and hot shrinkage factor is low, can obtain flexible fully recovery rate, initial tensile strength, obtains the best cloth and silk of balance.

Embodiment 13

Use the part directional fiber of embodiment 5, use after in 35 ℃, the atmosphere gas of 60%RH, preserving 90 days respectively, in addition under the condition identical, implement false twisting processing, obtain false-twisted fiber with embodiment 12.Because the weight average molecular weight of PLA is low, vertically the CV% of continuous damp and hot shrinkage factor is high slightly, and for compiling inspection, draftability, it is poor slightly to compare with embodiment 12, but can obtain good cloth and silk.

Comparative example 11

Use the part directional fiber of comparative example 1, use after in 35 ℃, the atmosphere gas of 60%RH, preserving 90 days respectively, in addition under the condition identical, implement false twisting processing, obtain false-twisted fiber with embodiment 9.Because PLA's is compound than low, can not suppress the vertically CV% of continuous damp and hot shrinkage factor, in addition, flexible recovery rate is also insufficient, and draftability is insufficient, can not obtain good cloth and silk.

Comparative example 12

Making PTT and the compound ratio of PLA is 45: 55, likewise obtains the part directional fiber with embodiment 1.The part directional fiber that obtains preserved 90 days in 35 ℃, the atmosphere gas of 60%RH after, under the condition identical, carry out false twisting processing, obtain false-twisted fiber with embodiment 1.Expectation is because the compound ratio of PLA is high, and initial tensile strength is high, and in addition, flexible recovery rate uprises than increase because PLA is compound, but does not obtain high value.Think this be because, receive that PTT is compound to be influenced than step-down, compound than balance variation.The flexibility of the cloth and silk that obtains is poor.

Embodiment 14～15, comparative example 13

The part directional fiber of embodiment 4 preserved 90 days in 35 ℃, the atmosphere gas of 60%RH after, carry out false twisting processing with the processing multiplying power of record in the table 4.Except the processing multiplying power, under the condition identical, carry out with embodiment 10.Through change processing multiplying power, vertically the CV% of continuous damp and hot shrinkage factor and flexible recovery rate change, and among the embodiment 14 and embodiment 15 in the prescribed limit of the present invention, can obtain good cloth and silk.On the other hand, in the comparative example 13 since vertically the CV% of continuous damp and hot shrinkage factor high, be 5.3%, compile inspection defective outside, in flexible appraisal, the contraction of cloth and silk is uneven big, although initial tensile strength is low, sense of touch is rough, and is defective.

Embodiment 16～17, comparative example 14

The part directional fiber of embodiment 4 preserved 90 days in 35 ℃, the atmosphere gas of 60%RH after, carry out false twisting processing with the D/Y ratio of record in the table 4.Except D/Y than under the condition identical, carry out with embodiment 10.Through changing the D/Y ratio, vertically the CV% of continuous damp and hot shrinkage factor and flexible recovery rate change, and among the embodiment 16 and embodiment 17 in the prescribed limit of the present invention, can obtain good cloth and silk.On the other hand, in the comparative example 14 because flexible recovery rate is insufficient, be 23%, only can obtain the cloth and silk of draftability difference.

Industrial applicability

Even since can provide through practical essential long-term warehouse preserve the package shape through the time change also little, false twisting processing is good; And then have concurrently dyeing stability, soft feeling be suitable for mass-produced part directional fiber and cheese-form package; And then provide that can to make bulkiness, retractility, flexibility excellent; The false-twisted fiber of the cloth and silk of stay in grade, therefore for common dress material purposes, be that the goods, materials and equipments purposes of representative is suitable with the automobile inside material.Particularly because long-term carrying easily, can be carried out global operation.

Claims (3)

1. partly oriented core-sheath polyester composite fiber, it is that the core composition is that PLA, sheath composition are the core sheath composite fibre that poly terephthalic acid Sanya methyl esters constitutes, and it is characterized in that meet the following conditions (1)～(3):

(1) percentage elongation: 60～130%,

(2) 70 ℃ of warm water shrinkage factors: 0.5～6.0%,

(3) initial tensile strength: 20～40cN/dtex,

(4) weight average molecular weight of PLA is 200,000～300,000,

(5) the compound ratio of PLA is 20～50wt%.

2. cheese-form package; It is characterized in that; Be the described partly oriented core-sheath polyester composite fiber of claim 1 to be batched form; And behind the coiling package, (6)～(7) below the saddle of in 35 ℃, the atmosphere gas of 60%RH, measuring chimb and the cheese-form package of the cheese-form package that obtains after through 90 days preservation satisfies:

(6) chimb of cheese-form package :-5～5%

(7) saddle of cheese-form package: 0～5%

3. core-sheath polyester composit false twisting processing fiber; Its core composition that is to use the described partly oriented core-sheath polyester composite fiber of claim 1 is that PLA, sheath composition are the core sheath composit false twisting processing fiber that poly terephthalic acid Sanya methyl esters constitutes; It is characterized in that; Condition (8)～(10) below satisfying

(8) CV%:0～5% of vertical continuous damp and hot shrinkage factor,

(9) initial tensile strength: 20～40cN/dtex,

(10) flexible recovery rate: 25～60%.

Images