JPH07310249A - Conjugated yarn for elastic polyester fabric and production of elastic polyester fabric using the same - Google Patents

Abstract

PURPOSE:To produce a polyester woven fabric exhibiting a high elasticity even under a strong restraint condition or in the case a twisted crimped yarn is used. CONSTITUTION:The characteristic of this method for production of an elastic polyester fabric is that it is carried out by applying a hydrolysis treatment to a composite fiber composed of polyester-based multifilament crimped yarns (A) and readily soluble polyester-based multifilament yarns (B) having a yarn length 0 to 15% shorter than that of (A) and a hydrolysis rate >=10 times higher than that of (A) and satisfying twist coefficient K=40 to 200 and number of twist=100K/sq. rt. D<2/1> (provided that D is the denier number of the composite fiber) or a fabric woven by at least partly using it, removing the readily soluble polyester-based multifilament yarns (B) and subsequently applying a relaxation treatment thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to imparting stretchability to a polyester woven or knitted fabric using a polyester crimped yarn, and more specifically to a composite capable of imparting good stretchability to a woven or knitted fabric even under strong restraint of the woven or knitted fabric. The present invention relates to a method for producing a yarn and a stretchable polyester woven / knitted fabric.

[0002]

2. Description of the Related Art Conventionally, in order to impart elasticity to a woven or knitted product using a polyester multifilament yarn, a method has been adopted in which the multifilament is formed into crimped yarn such as false twisting and then woven and knitted. According to this method, good stretchability is certainly obtained when the density of the woven or knitted material is low, but it is difficult to obtain good stretchability when the density of the woven or knitted material is high or when the yarn is twisted. . As a countermeasure against this, there is a method of using a covering yarn in which an elastic yarn is used as a core yarn and a polyester multifilament yarn is used as a sheath yarn, but it is not often used because it is difficult to handle and the cost becomes high.

[0003]

[Problems to be Solved by the Invention] By using crimped yarn such as false twisting which is inexpensive and easy to handle, good stretchability can be obtained even if the density of the woven or knitted fabric is high or the yarn is twisted. It is an object of the present invention to provide a woven / knitted fabric.

[0004]

That is, the present invention relates to a composite yarn suitable for producing a stretchable woven or knitted fabric and a method for producing a stretchable woven or knitted fabric using the same. The yarn length difference is 0% to 15% shorter, and the hydrolysis rate is 10 times or more faster. The easily soluble polyester multifilament yarn B has a twist coefficient of 40 to
A composite yarn for stretchable polyester woven or knitted fabric, which is 220 and satisfies the following formula (1). Number of twists (times / meter) = 100K / √D (1) (D is the denier of the composite yarn)

In the production method of the present invention, the polyester multifilament crimped yarn A and the yarn length difference from the A are 0% to 1
A woven or knitted fabric containing at least a part of a composite yarn composed of a 5% shorter and more easily 10 times faster hydrolyzable polyester-based multifilament yarn B was added to the easily soluble polyester-based multifilament yarn B. A method for producing a stretchable polyester woven or knitted fabric, characterized in that after relaxing and removing, it is subjected to a relaxing dyeing finishing process.

The proportion of the easily soluble polyester multifilament yarn B in the composite yarn of the present invention is preferably 40% by weight or less and 5% by weight or more.

Further, in the present invention, the crimp fastness ratio (CD) of the polyester multifilament crimped yarn A is preferably 12% or more, and the easily soluble polyester multifilament crimped yarn B has a crimp fastness ratio (CD) of 70 ° C. Hydrolysis rate of polyester multifilament crimped yarn A is 1
0 times faster or more, and the temperature at which the easily soluble polyester multifilament yarn B of the woven or knit is hydrolyzed and removed is 70 ° C.
The following is preferable. Furthermore, it is desirable that after the woven fabric is produced using a water jet loom, the easily soluble polyester multifilament yarn B is hydrolyzed and removed by a relaxation treatment such as dyeing finishing.

The present invention will be described in more detail below. The polyester multifilament crimped yarn A shown in the present invention has polyethylene terephthalate or polyethylene terephthalate as a main component, and a polymer obtained by polymerizing isophthalic acid, 5-sodium sulfonic acid metal salt or the like as a third component is spun into After the oriented undrawn yarn,
A method capable of performing draw false twisting is generally used, but the method is not particularly limited to this.

The easily soluble polyester multifilament yarn B is a fiber which is easily hydrolyzed by an alkali such as polyethylene glycol mixed polyethylene terephthalate fiber, and has a hydrolysis rate of 10 than that of the polyester multifilament crimped yarn A. It is necessary to be twice as fast. When the hydrolysis rate is less than 10 times, the polyester multifilament crimped yarn A is also hydrolyzed in the process of dissolving and removing the easily soluble polyester multifilament yarn B after weaving and knitting, and the stretchability is deteriorated. It is not preferable.

It is necessary that the yarn length difference of the easily soluble polyester multifilament yarn B is 0% to 15% shorter than that of the polyester multifilament crimped yarn A. By doing so, the polyester-based multifilament crimped yarn A can be prevented from being stretched during weaving and knitting, and the stretchability can be exhibited in the woven or knitted product after the easily soluble polyester-based multifilament yarn B is dissolved and removed. This yarn length difference can be obtained as a composite yarn by subjecting the easily soluble polyester-based multifilament yarn B and the polyester-based multifilament crimped yarn A, which is over-fed by 0% to 15%, to the air entanglement treatment or the like. . If the difference in yarn length is less than 0%, good stretchability cannot be obtained, and if the difference in yarn length is greater than 15%, the composite yarn has defects such as loops and neps, which is not preferable.

A woven or knitted fabric using at least a part of the composite yarn can be easily made with caustic soda or the like prior to relaxing and dyeing and finishing. Polyester multifilament yarn B
Is removed by hydrolysis. By doing so, the polyester-based multifilament crimped yarn A in a relaxed state in the woven or knitted fabric can exhibit a large relaxed shrinkage which has not been found by the conventional method. Since crimps of polyester fibers usually appear around 80 ° C., it is preferable to hydrolyze the easily-dissolvable polyester-based multifilament yarn B before the crimps develop in the relaxation step. Polyester multifilament yarn B
It is a more preferable condition that the hydrolysis rate of the product is 10 times or more faster than that of the polyester-based multifilament crimped yarn A at a low temperature of 70 ° C. or less.

The ratio of the easily soluble polyester multifilament yarn B in the composite yarn is 40% by weight to 5%.
A weight% range is preferred. If it exceeds 40% by weight, the price of the fabric becomes too high, and too large voids are formed in the woven or knitted fabric, so that the fabric is not solid, which is not preferable, and if it is 5% by weight or less, the polyester multifilament crimp There are too few voids in which the yarn A can freely expand and contract when relaxing, and yarn breakage or the like occurs during the production of the woven or knitted fabric, which is not preferable.

The twist coefficient K40 of the composite yarn represented by the following formula
The present invention can exert a greater effect when it is in the range of 220 to 220. Number of twists (turns / meter) = 100K / √D where D is the number of denier of the composite yarn It is known that the crimped yarn such as the usual false twisted yarn has a reduced elasticity as it is twisted. In the method for producing a stretchable polyester woven / knitted fabric using the composite yarn of the invention, the degree is remarkably improved. When the twist coefficient K is less than 40, the twisting effect is small, and when it is 220 or more, the elasticity does not appear.

As described above, according to the present invention, it is possible to produce a polyester woven or knitted fabric having excellent elasticity, which has not been obtained in the past. Further, the easily-dissolvable polyester-based multifilament yarn B of the present invention can be woven by a water jet loom and is also a feature of the present invention.

The present invention will be described below with reference to examples.
The present invention is not limited to this.

Example: Polyethylene terephthalate was fed at a speed of 3200.
After spinning at m / min, false false twist was applied to obtain a false twist textured yarn of 125 denier 24 filaments (polyester multifilament crimped yarn A). The crimp fastness (CD) of this yarn was 16%. Method of measuring crimp fastness (CD): A wrap reel having a length of 1 m per lap was used to make a cassette with 8 windings, and a load of denier of yarn × (5/1000) × 8 × 2 g was applied. In this state, the rapizole solution is immersed for 5 minutes in hot water at 98 ° C. in which the concentration is 2 g / 1. Then, the sample is taken out and a load of denier of the yarn × 0.2 × 8 × 2 g is applied in the wet state to measure the length a after 1 minute. After that, it was dried with hot air at 60 ° C. for 30 minutes and then left for 1 hour or more, and the denier of the yarn × (2/1
000) × 8 × 2 g is applied and the length b after 1 minute is measured. The crimp fastness (CD) is obtained by substituting the data of a and b thus obtained in the following formula. Crimping fastness = 100 (ab) / a

A polymer prepared by mixing 10 mol% of isophthalic acid copolymerized polyethylene terephthalate and polyethylene glycol having a molecular weight of 20,000 was spun at a speed of 3200 m / min, and then stretched to give 10 denier 6 filaments, a highly soluble polyester multifilament yarn B. Got The hydrolysis rate of the yarn at 70 ° C. was 32 times that of the polyester multifilament crimped yarn A. The hydrolysis rate is expressed as the reciprocal of the time until the weight of the fiber becomes half in the solution of caustic soda 50 g / 1.

By combining one or a plurality of easily soluble polyester multifilament yarns B and polyester multifilament crimped yarns A, an air entanglement machine capable of arbitrarily adjusting the feed amount is used to produce several levels of composite yarns. Had made. Stretchability of the sample was obtained by driving the composite yarn into a polyester multifilament having a warp yarn of 36 filaments and a weft yarn of a fabric having a density of 45 filaments / cm, and then sequentially performing hydrolysis treatment, relaxation treatment, and dyeing finishing treatment. An evaluation was made. The results are shown in Table 1.

[0018]

[Table 1]

[0019]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the stretchability of a woven or knitted material, which cannot be sufficiently obtained by the conventional polyester multifilament crimped yarn, can be greatly improved. In particular, when the crimped yarn is twisted and used, the effect is particularly large.

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Claims (2)

[Claims] 1. A twist comprising a polyester-based multifilament crimped yarn A and a readily soluble polyester-based multifilament yarn B having a yarn length difference of 0% to 15% shorter than that of A and a hydrolysis rate 10 times or more faster. Coefficient is 40-22
A composite yarn for stretchable polyester woven or knitted fabric, which is 0 and satisfies the following formula (1). Number of twists (times / meter) = 100K / √D (1) (D is the number of denier of the composite yarn) 2. A composite yarn comprising a polyester-based multifilament crimped yarn A and a readily soluble polyester-based multifilament yarn B having a yarn length difference of 0% to 15% shorter than the A and having a hydrolysis rate 10 times or more faster. A method for producing a stretchable polyester woven / knitted fabric, which comprises subjecting a woven / knitted fabric containing at least part of the above to a relaxing treatment after hydrolyzing and removing the easily soluble polyester multifilament yarn B.