JPS6245734A - Special blended fiber yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a special mixed fiber yarn that still has bulkiness even after being made into a fabric such as a woven or knitted fabric. The drawn gold yarn, which is a mixture of high-shrinkage polynystil yarn serving as a core yarn and low-shrinkage composite spun yarn with latent crimpability, is shrunk by heat treatment and post-processing to reduce the difference in shrinkage. The present invention relates to a special composite mixed fiber yarn that exhibits latent crimp and still has sufficient bulkiness even after being made into a fabric.

<Prior Art> As a method of imparting bulkiness to yarn, a method of false twisting is generally employed. However, the false twisting speed is generally much slower than the stretching speed, which poses a problem in terms of productivity. A method of imparting bulk to drawn yarn with excellent productivity has also been adopted. There are three typical methods:

■ A method of combining yarns with different heat shrinkability to obtain bulkiness caused by the difference in heat shrinkage in the post-processing process.

■ A method of directly adding loops, fluff, etc. to the drawn yarn.

■ A method of creating drawn yarn with latent crimpability and obtaining bulkiness due to the crimp that occurs simultaneously with shrinkage in the post-processing process.

When these methods are used, the resulting yarn has bulkiness. However, even when these methods are used, when a fabric is made from the obtained yarn, the yarn in the obtained fabric has almost no bulk.

There are many possible reasons for this, including the fact that the threads are bound within the fabric structure, and the tension applied to the threads during fabric production strips the threads of their bulkiness.

<Problems to be Solved by the Invention> The present invention provides a special mixed fiber yarn that has sufficient bulkiness after being made into a fabric such as a woven fabric, a knitted fabric, or a non-woven fabric.

<Means for Solving the Problems> The present invention comprises a polyester yarn (A) having a high heat shrinkage rate, a polyester yarn (A) having a lower heat shrinkage rate and potential crimpability,
In addition, it is a mixed fiber yarn with a composite spun yarn (B) having a cross section formed by bonding different types of polymers.

As is clear from this, the present invention aims to simultaneously impart bulkiness due to conventional differential shrinkage and bulkiness due to latent crimpability. A composite spun latent crimp yarn made by laminating different types of polymers on a low-shrinkage yarn is used, and due to the difference in shrinkage from the high-shrinkage yarn that serves as the core yarn, sagging occurs and crimp occurs at the same time. By shrinking the blended yarn of the invention through post-processing, a bulky yarn having a double crimp structure can be obtained.

In order to utilize these structures more effectively, the following points can be mentioned.

(2) The core yarn should have high shrinkage.For this purpose, it is preferable to use a modified polymer with high shrinkage or to lower the heat treatment temperature during stretching.

The preferred heat treatment temperature for this is in the range of 80-100°C.

■ It is preferable that the shrinkability of the latent crimp composite yarn, which becomes the side yarn, is low because the difference in yarn length from the core yarn will be large, but since the contractility of this composite yarn can also trigger the development of latent crimp, it is preferable to have low contractility. It is also not preferable to reduce the shrinkage rate to a low boiling water shrinkage rate of 5.
About 10% is preferable.

■ The combination of polymers used for the composite spun yarn (B) that causes crimp is preferably such that the difference in shrinkage is large, and combinations with polymers having a high degree of polymerization, polymer structure, and degree of modification are preferable, and low shrinkage is preferred. The occurrence of torsion becomes large at this rate.

Next, the configuration of the present invention will be explained in detail. First of all, as for the highly shrinkable polyester yarn (N) that is to be the core yarn, as mentioned above, it is possible to increase the shrinkage rate by lowering the heat treatment temperature during drawing, but in this case, cross-firing occurs during drawing. In this case, the polymer used for the core yarn is inophthalic acid. Typical examples include polyethylene terephthalate modified with sulfoisophthalic acid and sulfoisophthalic acid.Of course, other polymers can be used as long as the side threads are of low shrinkage.

Next, the latent crimpable composite spun yarn that will become the side yarn (combinations of polymers used for the yarn include those with different viscosities and degrees of polymerization, modified polymers and unmodified polymers, and combinations of polymers with different main chains) It will be done.

However, among these combinations, combinations of polymers that differ only in viscosity and degree of polymerization generally have poor spinnability.

Preferably, a combination of inphthalic acid-modified polyethylene terephthalate or polybutylene terephthalate and unmodified polyethylene terephthalate is preferred; this combination has excellent operational stability.

Further, by making the cross section of the spinning nozzle hole flat or irregular, two additional values can be obtained.

It is also possible to obtain a mixed yarn of polyester yarn (A) and composite spun yarn (■) all at once by stretching an undrawn yarn that has been extruded and wound from the same nozzle. In this case, It is preferable to use a nozzle in which holes for forming the polyester thread (A) are arranged in the center of the nozzle and holes for forming the composite spun thread (B) are arranged in the outer periphery of the nozzle.

In addition, it is preferable that the single yarn fineness of the polyester yarn (A) is larger than the single yarn fineness of the composite spun yarn (average) from the viewpoint of bulkiness, and the single yarn fineness of the polyester yarn (A) is 2 to 5 deniers. From the range, the single yarn fineness of the composite spun yarn (B) is 1
Usually selected from the range of ~3 denier.

Further, the mixed fiber yarn of polyester yarn (A) and composite spun yarn (B) may be subjected to false twisting during drawing or false twisting after drawing, or may be subjected to false twisting or crimping. A special crimped yarn with different phases can be obtained. As mentioned above, the polyester yarn (A) must have better heat shrinkability than the composite spun yarn (B). The preferable heat shrinkage rate is:
Expressed in terms of boiling water shrinkage, it is generally expressed as polyester yarn (A
) is larger than 10% and the composite spun thread (B) is smaller than 10%.

Such polyester yarn (A) and composite spun yarn ■)
The mixed fiber yarn consisting of is subjected to shrinkage treatment in the post-processing process. Usually, the shrinkage treatment is carried out in the fabric state after the mixed fiber yarn is made into a fabric. Through this shrinkage treatment, polyester yarn (A
) is greatly shrunk, and the composite spun yarn (B) comes to have crimps. This shrinkage treatment is usually carried out in dry heat, in a hot water bath, or in steam. The shrinkage rate is 5 to 30% in at least one direction, especially 10 to 20%.
% shrinkage is preferable from the viewpoint of bulkiness.

<Functions and Effects> The high-density yarn obtained by conventional methods had the disadvantage that bulkiness was almost completely lost when it was made into a fabric.
The bulky yarn of the present invention can exhibit sufficient bulkiness after being made into a fabric, and as a result, the fabric using the mixed fiber yarn of the present invention is rich in bulkiness and has a supple texture. Become.

Example 1 A modified polyethylene terephthalate polymer containing 8 mol of low polymerization degree inphthalic acid obtained by a conventional method was discharged from the center of a 12-hole nozzle as a single polymer thread (A), and was mixed with a high polymerization degree polybutylene terephthalate polymer. 8 mol of low-polymerization degree isophthalic acid and modified polyethylene terephthalate polymer were discharged from the outer periphery of 24 holes at a ratio of 50:50 as a composite yarn (B), and 186 denier 36 A filament composite yarn was spun. Subsequently, stretching was carried out at a speed of 800 m7 under stretching conditions of a stretching roller temperature of 85° C., a stretching plate temperature of 145° C., and a stretching ratio of 2.50 times.

As a result, the single yarn fineness of the entry side yarn was 3.1 denier and the boiling water shrinkage rate was 13.8 inches, and the single yarn fineness of the B side yarn was 1.6 denier and the boiling water shrinkage rate was 7.8 inches. Ta.

A palace fabric was created using the obtained yarn.

When the obtained fabric was shrunk by 10% in both the length and width under heating conditions, a fabric with a texture that was extremely bulky, had a textured yarn-like touch, and was excellent in colorability was obtained.

Example 2 A 152-denier 24-filament undrawn yarn (normal polyethylene/terephthalate) made of normal polyethylene terephthalate polymer obtained by a conventional method and spun at a winding speed of 1200 m/7 minutes.
For 50:50 dispensing and tensioning of 12 mol of polyester isophthalic acid modified polyethylene terephthalate polymer, a flat cross-section composite yarn (B) of nozzle type D/L = 1/8 was fed at the same speed as the needle. , the same fineness and the same number of filaments. When drawing these two yarns (A) and (B) at a stretching ratio of 3.10 times, both A yarns were stretched only with a stretching roller at 85°C, and B
Both yarns were drawn using a 160°C drawing plate, and both yarns were
Doubling and winding was performed at a drawing speed of 0.00 m7 minutes.

As a result, the single yarn fineness of both yarns A was 2.0 denier and the boiling water shrinkage rate was 16.3%, while the single yarn fineness of both yarns B was 2.0 denier and the boiling water shrinkage rate was 6. It was 9%. A satin fabric was created using the obtained yarn. When this fabric was shrunk by 15% in both length and width under heating conditions, a fabric with excellent surface gloss and bulkiness similar to textured yarn was obtained.

Claims (1)

[Claims] 1. A shape in which a polyester yarn (A) with a high heat shrinkage rate and a polymer with a lower heat shrinkage rate, latent crimpability, and different cross sections are laminated together. A blended yarn with a composite spun yarn (B) having 2. The mixed fiber yarn according to claim 1, wherein the polymer constituting the polyester yarn (A) is an isophthalic acid or sulfoisophthalic acid-modified polyester polymer. 3. The mixed fiber yarn according to claim 1, wherein the single fibers constituting the composite spun yarn (B) are composed of a polyethylene terephthalate polymer and an isophthalic acid-modified polyester polymer. 4. The mixed fiber yarn according to claim 1, wherein the single fibers constituting the composite spun yarn (B) are composed of a polybutylene terephthalate polymer and a polyethylene terephthalate polymer. 5. The mixed fiber yarn according to claim 1, wherein the single fibers constituting the composite spun yarn (B) have a flat cross section. 6. The mixed fiber yarn according to claim 1, wherein the mixed fiber yarn is obtained by drawing an undrawn yarn extruded and wound from the same nozzle. 7. The mixed fiber yarn according to claim 1, wherein the mixed fiber yarn is a compound yarn mixed immediately before, during or after drawing. 8. The mixed fiber yarn according to claim 1, wherein the mixed fiber yarn has been subjected to an entanglement treatment. 9. The mixed fiber yarn according to claim 1, wherein the mixed fiber yarn has been subjected to a false twisting process. 10. The mixed fiber yarn according to claim 1, wherein the single yarn fineness of the polyester yarn (A) is larger than the single yarn fineness of the composite spun yarn (B). 11. The mixed fiber yarn according to claim 1, wherein the polyester yarn (A) has a boiling water shrinkage rate of more than 10%, and the composite spun yarn (B) has a boiling water shrinkage rate of less than 10%.