JPH1181096A - Knit fabric of interknitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a knit fabric of interknitting having a few of defects such as warp streaks, etc., hardly causing the condition of a dress getting old and out of shape, in the state of a few end breakages in knitting, by interknitting a polytrimethylene terephthalate yarn and an elastic yarn. SOLUTION: (A) A polytrimethylene terephthalate yarn and (B) an elastic yarn (>=20%, preferably 40-95% set ratio) are interknitted to give the objective uniform interknitted fabric having loops of interknitted fabric set once and fixed, hardly being deformed, slight in width variability of elongation and contraction in a dyeing and finishing process, having a few defects such as streak, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-knitted fabric of an elastic fiber and an inelastic fiber, and more particularly to a cross-knitted fabric in which the non-elastic fiber is a polytrimethylene terephthalate fiber.

[0002]

2. Description of the Related Art As is well known, a knitted fabric obtained by knitting an elastic fiber and a nylon fiber, such as a tricot 2WAY and a power net, occupies a considerable amount in the fields of inner foundation, swimwear and the like. Have been. Such a knitted knitted fabric is dyeable under normal pressure, and while vivid coloration and robustness can be obtained by the dyeing, there are many yarn breaks during knitting,
The obtained knitted knitted fabric and product had poor quality stability due to warp and the like, and it was difficult to obtain a good finished product. Therefore, in order to reduce defects such as warp, strict production control is required in the knitting and inspection processes, and the yield is significantly lower than that of a knitted fabric made of 100% nylon fiber. It was necessary to avoid the color tone and the plain dyeing of the warp lines which were not so noticeable, and to use the print dyeing which was not so noticeable as the defect.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a knitted knitted fabric with reduced defects such as warp.

[0004]

The inventors of the present invention have studied the warp factor of the conventional cross-knitted fabric, and as a result, the warp streaks are not uniform in each stitch constituting the knitted fabric. Therefore, when viewed continuously in the meridian direction, a wide stitch and a narrow stitch occur in the stitch gap, and the wide portion appears as a thin streak with large light transmission, and conversely, a narrow portion as a dark streak with a small light transmission. It was found that the irregular stitches were visible due to the difference in physical properties between the elastic fiber and the inelastic fiber.

That is, the resilience (pulling resistance) and the resilience of the elastic fiber and the inelastic fiber during and after knitting in the knitting step are too different. In other words, unwinding, uneven stitches due to uneven knitting tension of the elastic yarn having poor smoothness, if only elastic fibers, return to its original state with its excellent elasticity, which can be a uniform stitch. At the same time, the inelastic fiber having a high initial tensile resistance to be knitted presses the elastic fiber to be recovered, so that it is not balanced, leaving irregular stitches, which is considered to result in induction of warping. The present inventors have intensively studied to solve such a drawback, and as a result, have completed the present invention. That is, the present invention is a cross-knitted fabric characterized by cross-knitting polytrimethylene terephthalate fibers and elastic fibers.

Hereinafter, the present invention will be described in detail. In the present invention, the term "polytrimethylene terephthalate fiber" refers to a polyester fiber having a polytrimethylene terephthalate unit as a main repeating unit.
0 mol% or more, more preferably 80 mol% or more, particularly preferably 90 mol% or more. Therefore, the total amount of the other acid component and / or glycol component as the third component is about 50 mol% or less, preferably 30 mol% or less,
More preferably 20 mol% or less, particularly preferably 10 mol% or less.
It includes polytrimethylene terephthalate contained in the range of not more than mol%.

[0007] Polytrimethylene terephthalate is synthesized by combining terephthalic acid or a functional derivative thereof with trimethylene glycol or a functional derivative thereof in the presence of a catalyst under appropriate reaction conditions. In this synthesis process, an appropriate one or two or more third components may be added to form a copolymerized polyester, or a polyester other than polytrimethylene terephthalate such as polyethylene terephthalate, nylon and polytrimethylene terephthalate may be used. After separately synthesized, they may be blended or composite-spun (sheath core, side-by-side, etc.).

The third component to be added includes aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexane dicarboxylic acid, etc.), and aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.). ), Aliphatic glycols (ethylene glycol, 1,2
-Propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexanediol, etc.), aromatic dioxy compounds (hydroquinone, bisphenol A, etc.), aliphatic glycols containing aromatic [1,
4-bis (β-hydroxyethoxy) benzene, etc.], polyether glycol (polyethylene glycol, polypropylene glycol, etc.), aliphatic oxycarboxylic acid (ω-oxycaproic acid, etc.), aromatic oxycarboxylic acid (P-oxybenzoic acid) Etc.).

Compounds having one or more ester-forming functional groups (such as benzoic acid or glycerin)
Can be used as long as the polymer is substantially linear. Furthermore, polytrimethylene terephthalate is
Matting agents such as titanium dioxide, stabilizers such as phosphoric acid, ultraviolet absorbers such as hydroxybenzophenone derivatives, crystallization nucleating agents such as talc, lubricating agents such as aerosil, antioxidants such as hindered phenol derivatives, flame retardants , An antistatic agent, a pigment, a fluorescent whitening agent, an infrared absorber, an antifoaming agent, and the like.

[0010] In the present invention, the polytrimethylene terephthalate fiber is spun at a winding speed of about 1500 m / min to obtain an undrawn yarn, and then it is twisted at a rate of about 2 to 3.5 times. -Direct-rolling method directly connected to the twisting process,
Any method such as a high-speed spinning method (spin draw or spin take-up method) with a winding speed of 5000 m / min or more may be employed. Further, the form of the fiber may be a long fiber or a short fiber, and may be uniform or thick in the length direction, and may be round, triangular, L-shaped, T-shaped, Y-shaped or W-shaped even in cross section.
It may be a polygonal type such as a mold, an eight-leaf type, a flat shape, a dogbone type, etc., a multi-leaf type, a hollow type, or an irregular shape.

Further, the form of the yarn may be a spun yarn such as a ring spun yarn or an open-end spun yarn, a multifilament yarn (including an ultrafine yarn) having a single yarn denier of about 0.1 to 5 denier, a sweet twisted yarn or the like. Strong twisted yarn, mixed yarn, false twisted yarn (PO
Y (including a drawn false twisted yarn), and a fluid jet processed yarn such as a so-called Taslan processed yarn. In addition, other fibers such as natural fibers such as wool are blended (silospan or silofil, etc.) and entangled blended fibers (with high shrinkage yarns) within a range of usually 30% by weight or less within a range not to impair the object of the present invention. May be mixed by means such as different shrinkage mixed fiber yarns), alternate twisting, composite false twisting (elongation difference false twisting, etc.), two-feed taslan processing, or the like.

In the present invention, as the elastic fiber, polyurethane-based, polyester-based, polyetherester-based or other such elastic fibers can be used, and ordinary polyurethane-based elastic fibers, for example, obtained by dry spinning or melt spinning, are used. The polymer and spinning method are not particularly limited.
The denier of the fiber is preferably from 20 to 420, and the breaking elongation is from 400% to 1000%, which is excellent in elasticity.
It is preferable that the stretchability is not impaired at around the normal processing temperature of 190 ° C. in the pre-setting step at the time of dyeing.

For example, a copolymerized polyalkylene ether diol, mainly composed of a polyurethane obtained from an aromatic diisocyanate composed of 4,4'-diphenylmethane diisocyanate and a difunctional diamine, wherein the urethane moiety in the polyurethane has a number average molecular weight of 6,000 to 95
00, and the number average molecular weight of the urea moiety is 650 to 950
Polyurethane elastic fibers having a 300% modulus of 0.20 g / denier or less are preferred, but are not limited thereto.

The set ratio of the elastic yarn used in the present invention is 2
It is preferably at least 0%, more preferably at least 40% and at most 95%. 20% elastic yarn set rate
If it is lower, defects such as poor width stop at the time of fabric processing and curling of the edge of the fabric are apt to occur, and the product may not satisfy the form stability such as shrinkage due to washing when the fabric loses its shape. On the other hand, the set rate is 95
%, The elastic yarn becomes stretched due to the heat during processing of the fabric, so-called settling occurs, and the power reduction and elongation recovery functions of the product are not sufficiently exhibited. Therefore, the set ratio of the elastic yarn used in the present invention is preferably 20% or more, more preferably 40% or more and 95% or less. In particular, by using such elastic fibers having a set ratio of 40% or more and 95% or less, defects such as warps generated in warp knitted fabrics are further reduced.

That is, the drawbacks such as warping are consistently performed in the dyeing process, for example, elongation and shrinkage such as tentering by heat setting, shrinkage by dyeing, and fining by heat setting in the finishing process. This is considered to be caused by the fact that the loops forming the knitted knitted fabric are repeatedly deformed and the size does not become uniform by repeating this process. However, the knitted knitted fabric of the present invention has the loop of the knitted knitted fabric set and fixed once because the polytrimethylene terephthalate fiber and the elastic fiber having a set ratio of 40 to 95% are knitted. Is difficult to deform, and the width fluctuation of elongation and shrinkage in the dyeing finishing process can be reduced,
A uniform knitted fabric without defects such as streaks is obtained. In addition, for example, in the case of pantyhose, the last shape of the product provided in the manufacturing process is maintained even after repeated wearing. It has become possible to provide a cross-knitted fabric excellent in so-called shape memory.

Here, the set ratio is a value obtained by the following measurement and mathematical formula. After stretching and fixing the elastic thread length L0 in a tensionless and linear state to a length 1.5 times, it is put into a steam box as it is and sealed, and filled with live steam. The temperature in the steam box is 120 ° C
After 30 seconds while maintaining ± 1 ° C from the time when the temperature reached the temperature, the steam in the steam box was discharged, the elastic yarn was immediately taken out, and the yarn was sufficiently relaxed to a length of L0 or less.
Leave for 6 hours. Again, the elastic yarn is set in a non-tensioned and linear state, and when the length at that time is L1, the set ratio is defined by the following equation. Set rate (%) = [(L1−L0) /0.5L0] × 1
00

In the present invention, the elastic fiber having a set ratio of 40% or more and 95% or less is obtained by dry-spinning, wet-spinning and melt-spinning of a polyurethane polymer and melt-spinning of a polyetherester block copolymer. For example, an elastic fiber having such a set rate by dry spinning of a polyurethane polymer is obtained by reacting a polymer diol having hydroxyl groups at both terminal groups with a number average molecular weight of 500 to 5,000, an organic diisocyanate, and a chain extender having a polyfunctional active hydrogen atom. A low-molecular-weight diol having hydrogen groups at both terminals of a linear or branched alkylene group having 2 to 10 carbon atoms, or a divalent alicyclic hydrocarbon, based on 100 parts by weight of the polyurethane polymer obtained by the reaction. (A)
And a molar ratio of (A) / (B) = 1 to 99 with a high molecular weight diol (B) having a number average molecular weight of 400 to 3,000 and a reaction product of an organic diisocyanate, the terminal being a hydrogen group and a urethane It is a polyurethane elastic fiber to which 1 to 15 parts by weight of a thermoplastic urethane resin having a group concentration of 3 meq / g or more and a number average molecular weight of 10,000 to 40,000 is added.

Here, one of the raw materials of the polyurethane polymer
The high molecular weight diol is a substantially linear polymer having a molecular weight of 500 to 5,000 having hydroxyl groups at both ends, for example, polyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol, and polyoxypentane. Homopolyether diols such as methylene glycol or copolymerized polyether dials comprising two or more oxyalkylenes having 2 to 6 carbon atoms; adipic acid, sebacic acid, maleic acid, itaconic acid, azelaic acid, malonic acid, etc. One or more dibasic acids of ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 2,2-dimethyl-1,3-propanediol, 1,4-butanediol, 3-butanediol, hexamethylene glycol, diethyl Glycol, 1,10-decanediol, 1,3-dimethylolcyclohexane, 1,4
Polyester diols obtained from one or more glycols such as dimethylolcyclohexane; or polylactone diols such as polyester amide diol, polyester ether diol, poly-ε-caprolactone diol, polyvalerolactone diol, and polycarbonate diol. Can be mentioned. Preferred are polyoxytetramethylene glycol and copolymerized poly (tetramethylene neopentylene) ether diol.

As the organic diisocyanate, for example, all of the aliphatic, alicyclic and aromatic diisocyanates which are soluble or liquid under the reaction conditions can be applied. For example, methylene-bis (4-phenyl isocyanate-
G), methylene-bis (3-methyl-4-phenyl isocyanate), 2,4-tolylene diisocyanate,
2,6-tolylene diisocyanate, m- and p-xylylene diisocyanate, α, α, α ', α',-tetramethyl-xylylene diisocyanate, m- and p-
Phenylene diisocyanate, 4,4'-dimethyl-
1,3-xylylene diisocyanate, 1-alkylphenylene-2,4 and 2,6-diisocyanate, 3-
(Α-isocyanate-ethyl) phenyl isocyanate
2,6-diethylphenylene-1,4-diisocyanate, diphenyl-dimethylmethane-4,4'-diisocyanate, diphenylether-4,4'-diisocyanate, naphthylene-1,5-diisocyanate To
1,6-hexamethylene diisocyanate, methylene-
Bis (4-cyclohexyl isocyanate), 1,3-
And 1,4-cyclohexylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate −
And the like. Preferably, methylene-bis-
(4-phenyl isocyanate).

Examples of the chain extender having a polyfunctional active hydrogen atom include hydrazine, polyhydrazine, linear or branched aliphatic, alicyclic and aromatic active hydrogen having 2 to 10 carbon atoms. Compounds having an amino group, for example, ethylenediamine, 1,2-propylenediamine, diamines such as diamines having a urea group described in JP-A-5-155841, hydroxylamine, water, and low molecular weight glycols For example, ethylene glycol, 1,2-propylene glycol, 1,3
-Propylene glycol, 2,2-dimethyl-1,3-
Propanediol, 1,4-butanediol, 1,3-
Butanediol, hexamethylene glycol, diethylene glycol, 1,10-decanediol, 1,3-dimethylolcyclohexane, 1,4-dimethylolcyclohexane, and the like can be used.

As the terminal terminator having a monofunctional active hydrogen atom, for example, dialkylamine such as diethylamine is used. These chain extenders and terminal stoppers may be used alone or in combination of two or more. As the thread form of the elastic fiber of the present invention, an elastic fiber may be used as it is, synthetic fibers such as polytrimethylene terephthalate fiber or nylon fiber, polyethylene terephthalate fiber, acrylic fiber, polypropylene fiber, copper ammonia rayon, viscose. Rayon, regenerated fiber such as refined cellulose fiber, semi-synthetic fiber such as acetate fiber, long fiber or short fiber other than elastic fiber such as natural fiber such as cotton, wool or silk may be compounded. Can be used in the form of, for example, a covering, a core spun yarn, an interlaced entangled yarn, an air covering yarn, an intertwist, etc., and is not limited to the examples.

The knitted knitted fabric of the present invention is made of an elastic fiber and a polytrimethylene terephthalate fiber. The knitting machine can be a tricot knitting machine, a Russell knitting machine, or a circular knitting machine.
The denier to be used, the knitting model, and the gauge may be appropriately selected depending on the denier of the yarn to be used and the purpose of the product. Examples of the knitting structure include a half structure of a two reed structure in a tricot knitting machine, a polytrimethylene terephthalate fiber used for a first reed of a satin structure, and a changed structure by a combination of these structures. In a Russell knitting machine, a method of using polytrimethylene terephthalate fiber in a ground structure portion of a power net structure or a satin net structure is exemplified. In the circular knitting machine, there is a method in which an elastic yarn is compounded and fed at the same yarn feeder of a sheeting, smooth, and milling structure, but is not limited thereto.

The mixing ratio of the elastic yarn can be in a very wide range depending on the structure and the thickness of the yarn to be used.
Is preferred. In addition, the draft at the time of compounding the elastic yarn is preferably 1.5 to 3.5 times, and is appropriately selected according to the commerciality. Further, in order to more stably obtain a high-grade fiber having no warp, the denier ratio (du / de) between the elastic fiber and the polytrimethylene terephthalate fiber is in the range of 0.1 to 15, preferably 0.5. -9, more preferably 1-8. When the denier ratio is more than 15, the elastic fiber ratio is too high, and the elastic fibers may be exposed too much on the surface to prevent the quality from being maintained. In addition, when the denier ratio (du / de) is less than 0.1 In the case of knitting, the elastic force of the elastic fiber at the time of knitting is weak, so that it is difficult to balance the stress with the polytrimethylene terephthalate fiber, and there is a possibility that the quality cannot be maintained. Hereinafter, the present invention will be described in more detail using examples and the like.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

<Method for producing polytrimethylene terephthalate fiber> ηsp
The polytrimethylene terephthalate of /c=0.8 is spun at a spinning temperature of 265 ° C. and a spinning speed of 1200 m / min to obtain an undrawn yarn, then a hot roll temperature of 60 ° C., a hot plate temperature of 140 ° C., and a draw ratio of 3 times. , Stretching speed 800m
Per minute, and a drawn yarn of 50d / 36f was obtained. The tensile elongation, elastic modulus and elastic recovery at 10% elongation of the drawn yarn were 3.2 g / d, 46%, 30 g / d and 98 g, respectively.
%Met.

The elastic recovery at 10% elongation was as follows: the sample was subjected to an initial load of 0.01 g / d, and was stretched at a constant rate of 20% elongation per minute to reach an elongation of 10%. By the way, on the contrary, it contracts at the same speed, and draws a stress-strain curve.
Assuming that the residual elongation when the stress is reduced to 0.01 g / d, which is equal to the initial load, during contraction is L, it is a value calculated by the following equation. Elastic recovery rate at 10% elongation = [(10−L) / 10] ×
100 (%)

<Evaluation Method of Shape Memory of Pantyhose> Pantyhose was randomly extracted, worn by 10 women, worn for 8 hours, and usually washed 5 times. The shape of the pantyhose after washing five times and that of the non-wearing pantyhose were compared, and the grade was determined according to the following criteria. Grade 5: Legs having a shrinkage ratio of less than 5% in the vertical direction and little change in heel roundness. Grade 4: The leg has a contraction rate of less than 5% in the longitudinal direction and a reduced heel roundness. Grade 3: The leg has a contraction rate of 5% or more and less than 10% in the longitudinal direction, and a slightly reduced roundness of the heel. Grade 2: The leg has a contraction ratio of 5% or more and less than 10% in the vertical direction, and the heel roundness is considerably reduced. Grade 2: A leg having a contraction rate of 10% or more in the vertical direction of the leg portion and a substantially reduced roundness of the heel.

(Example 1) Polytrimethylene terephthalate fiber 50d / 36f obtained by the above-mentioned production method and polyurethane fiber (Leica manufactured by Asahi Kasei Corporation: trade name) 40 denier (wound while giving a 100% elongation draft)
Was knitted on a tricot knitting machine under the following conditions. Then, 9
Knitted fabric after relaxing with hot water at 0 ° C, pre-setting at 190 ° C for 40 seconds, dyeing at 95 ° C for 30 minutes, dehydrating, and final setting at 170 ° C for 40 seconds, has almost no warp and extremely high quality. And the texture was soft. Also, there was no particular problem in knitting. <Tricot knitting conditions> Knitting machine Tricot knitting machine 28 gauge knitting structure Half runner length Front 160cm / 480 course Back 80cm / 480 course

Example 2 Example 2 was repeated except that 280 denier polyurethane fiber (wound while giving a 75% elongation draft) was used as the polyurethane fiber and knitted by a Russell knitting machine under the following conditions. A knitted fabric was manufactured in the same manner as in Example 1, and the knitted fabric was evaluated. As a result, the knitted fabric was extremely high in quality with almost no warp and had a soft texture. There was no particular problem in knitting. <Russell knitting conditions> Knitting machine Russell knitting machine 28 gauge knitting structure Satin net runner length Front 110-125cm / 480 course Back 11cm / 480 course

Example 3 The same polytrimethylene terephthalate fiber 50d / 36f, polyurethane fiber 20 denier and set rate 51% (trade name: Leica FCS, manufactured by Asahi Kasei Corporation) as in Example 1 was used. Under the conditions, covering, knitting and setting were performed to make pantyhose. The shape memory evaluation of the obtained pantyhose was grade 5 6 grade, grade 4 grade 3 grade, grade 1 grade 1 person,
It showed that shape memory was high.

<Covering conditions> Elastic fiber draft 3.4 times Number of twists of winding yarn 500 turns / meter <Knitting conditions> Number of needles 400 Hook diameter 4 inches Diameter Leg part knitting 2000 courses <Setting conditions> Set Temperature 120 ℃ Steam set time 30 seconds

(Comparative Example 1) The results were evaluated in the same manner as in Example 1 except that the polytrimethylene terephthalate fiber was replaced with 50d / 17f nylon 66 (Leona manufactured by Asahi Kasei Corporation). In addition, warps were scattered, the texture was harder than in Example 1, and there was a problem in knitting properties such as thread breakage.

Comparative Example 2 Evaluation was made in the same manner as in Example 2 except that the polytrimethylene terephthalate fiber was replaced with 50d / 17f nylon 66 (Leona manufactured by Asahi Kasei Corporation). In addition, warps were scattered, the texture was harder than that of Example 2, and there was also a problem in knitting and knitting.

(Comparative Example 3) In Example 3, pantyhose (A) using 50d / 17f nylon 66 (made by Asahi Kasei Corporation: trade name) instead of polytrimethylene terephthalate fiber 50d / 36f, and In Example 3, a pantyhose (B) using 20 denier polyurethane elastic fibers and a set rate of 28% (trade name: Leica SC, manufactured by Asahi Kasei Corporation) was prepared. The shape memory evaluation results of the pantyhose (A) were grade 1 1st, 2nd grade 5th, 1st grade 4th grade, and the shape memory evaluation results of the pantyhose (B) were 3rd grade 1st,
Fourth graders and five graders. Comparative examples are (A) and (B)
Both indicated that shape memory was low.

[0034]

As described above, the knitted knitted fabric of the present invention is a high-quality knitted fabric having no warp, and can obtain a knitted knitted fabric with less thread breakage during knitting. The shape memory that the shape does not lose its shape was also provided.

Claims (2)

[Claims] 1. A cross-knitted fabric comprising polytrimethylene terephthalate fibers and elastic fibers cross-knitted. 2. The mixed knitted fabric according to claim 1, wherein the elastic fiber has a set ratio of 40 to 95%.