JP2000027044A - Bulky spun yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulky spun yarn comprising acrylic synthetic fibers having soft, resilient feeling and <=1 denier fiber size. SOLUTION: This bulky spun yarn contains (A) 20-80 wt.% of acrylic fibers having 0.4-1 d single yarn denier and 15-40% thermal shrinkage and (B) 20-80 wt.% of acrylic fibers having 0.4-1 d single yarn denier and <=5% thermal shrinkage, and has a sheath-core structure composed of at least total of the acrylic fibers A and acrylic fibers B is >=80 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulky spun yarn made of fine denier, in particular, an acrylic fiber having a fineness of 1 d or less.

[0002]

2. Description of the Related Art In recent years, there has been a demand for clothing products using a spun yarn made of a new synthetic fiber boom and fine denier acrylic fiber. For example, in the inner field and the like, there is a soft underwear using a spun yarn whose main material is an acrylic fiber having a fineness of 1 d or less. On the other hand, this kind of bulky spun yarn is applied to jerseys and the like by utilizing the softness of the spun yarn.

[0003] A spun yarn containing fine denier acrylic fiber having a fineness of 1 d or less and containing 60% by weight or more (hereinafter, unless otherwise specified,% means weight) is a soft yarn material as a matter of course. However, there is a drawback that there is no feeling of waist.
In order to compensate for this drawback, a bulky spun yarn is produced by heat-treating a spun yarn obtained by blending wool or a shrinkable acrylic fiber having a fineness of 1.5 d or more as a third component.

[0004]

By using the above-mentioned means, a bulky spun yarn having a firm feeling can be obtained.
However, the problem that the softness of the bulky spun yarn is impaired is inevitable. It is an object of the present invention to provide a soft, stiff bulky spun yarn using fine denier acrylic fiber having a single yarn denier of 1d or less as a main raw material.

[0005]

Accordingly, the present inventors have found that a spun yarn having a single yarn denier of 1 d or less and a high heat-shrinkable acrylic fiber having a specific heat shrinkage is subjected to a heat treatment and becomes soft. It has been found that it will be a bulky spun yarn that will not lose it. That is, the present invention provides a single yarn denier of 0.4
Acrylic fiber (A) having a heat shrinkage of 15 to 40% at 1 to 1 d
And acrylic fiber (B) having a heat shrinkage rate of 5% or less of single yarn denier of 0.4d to 1d and 20 to 80% by weight.
A bulky spun yarn having a sheath-core structure comprising at least 80% by weight, and a total of at least 80% by weight of an acrylic fiber (A) and an acrylic fiber (B).

Here, the heat shrinkage rate is JIS-L-101.
According to the 3A method. In addition, the sheath core structure is a bulky spun yarn that has developed bulky properties after heat treatment,
The acrylic fiber (A) occupies the center of the cross section of the yarn, while the acrylic fiber (B) occupies the outer layer of the yarn, forming a double structure and exhibiting bulkiness.

[0007]

DETAILED DESCRIPTION OF THE INVENTION In the present invention, acrylic fibers (A) and (B) are obtained by copolymerizing acrylonitrile (hereinafter referred to as AN) with 35 to 65% by weight of AN and an unsaturated vinyl compound copolymerizable with AN. It is a short fiber made of a polymer. When the AN in the copolymer is less than 35% by weight, the characteristics of the acrylic fiber are lost, which is not preferable.

The unsaturated vinyl compounds copolymerizable with AN include acrylic acid, methacrylic acid, acrylates (methyl acrylate, ethyl acrylate, etc.), and methacrylates (methyl methacrylate,
Ethyl methacrylate), acrylamide or methacrylamide and their monoalkyl substituents, styrene, vinyl acetate, vinyl chloride, vinylidene chloride, vinyl pyridine, and styrene sulfonic acid, vinyl sulfonic acid, allyl sulfonic acid, methallyl sulfonic acid, And salts of these sulfonic acids.

The acrylic fibers (A) and (B) are obtained by dissolving the above copolymer in a solvent such as dimethylformamide, dimethylacetamide, dimethylsulfoxide, a concentrated aqueous solution of nitric acid, a concentrated aqueous solution of rodane salt, or a concentrated aqueous solution of zinc chloride. The fiber is formed by applying a known wet spinning or dry spinning method or the like to the spinning solution of the copolymer prepared as described above, and the heat shrinkage is adjusted by a known method such as drawing in saturated steam or drawing by dry heat. It is selected from spinning fiber raw materials obtained through this.

It is important that both the acrylic fiber (A) and the acrylic fiber (B) constituting the bulky spun yarn of the present invention have a fineness of 0.4 to 1 d, preferably 0.5 to 0.9 d. is there. If it is less than 0.4 d, the spinnability is significantly reduced, which is not preferable. On the other hand, if the fineness exceeds 1d, the softness of the bulky yarn cannot be obtained. The acrylic fiber (A) is a fiber having a single yarn denier of 0.4 to 1 d and a heat shrinkage of 15 to 40% or less. The blending ratio of the acrylic fiber (A) is 20 to 80% by weight, preferably 30 to 80% by weight.
60% by weight. If the heat shrinkage of this fiber is less than 15%, the bulky yarn does not have a sheath-core structure,
The effect of improving the feeling of waist is poor. On the other hand, the heat shrinkage ratio is 40
%, The feeling of volume and the feeling of waist are improved, but it is difficult to produce such a highly shrinkable fiber. When the blending ratio of the acrylic fiber (A) is less than 20% by weight, the bulky yarn obtained does not have a sheath-core structure, and no improvement in waist feeling is observed. On the other hand, the upper limit is 80% by weight, and if the amount is more than this, the bulky yarn becomes too tight and the softness decreases.

The acrylic fiber (B) having a heat shrinkage of 5% or less has a total of 80% with the above-mentioned acrylic fiber (A).
It is necessary that the fibers are blended so as to be at least 90% by weight, preferably at least 90% by weight. When the sum of the acrylic fibers (A) and the acrylic fibers (B) is less than 80% by weight:
It becomes difficult for the spun yarn to maintain its softness. The bulky spun yarn of the present invention can be blended with a third component fiber other than the acrylic fiber (A) and the acrylic fiber (B). However, when the denier exceeds 3d, the mixing ratio is 10
% By weight or less. The fibers that can be used as the fibers for the third component are arbitrarily selected from synthetic fibers such as polyester, semi-synthetic fibers such as acetate fibers, regenerated fibers such as cupra rayon and viscose rayon, and natural fibers such as wool and silk. can do. However, it is necessary to select a fiber that does not impair the softness of the material, single yarn fineness, and the like in accordance with the gist of the present invention.

The bulky spun yarn of the present invention is prepared by applying the above-mentioned acrylic fiber (A) and acrylic fiber (B) and, if necessary, the third component fiber to a blended spinning method used in general-purpose spinning. can do. For example, a mixed spinning with a blended cotton in front of a card and a mixed spinning with a sliver by Gil are used. Twisting by spinning usually has a twist factor of 60 to 100.
It is good to be. The yarn count of the spun yarn depends on the intended use of the yarn, but 20 to 80 Nm is usually selected for outer clothing such as a 40 to 100 meter count (Nm) jersey for underwear.

[0013] The spun yarn thus obtained is subjected to bulking by a heat treatment to obtain a bulky spun yarn. This heat treatment can be performed at the stage of the spun yarn, but may be performed after processing the spun yarn into a fabric. In order to effectively form the sheath-core structure, it is preferable to exhibit bulkiness by applying a heat treatment at the stage of the spun yarn. The heat treatment for bulking is preferably performed by a dyeing process. But,
Heat treatment by steam treatment may be applied before dyeing. When bulking is performed at the time of dyeing, the temperature of the dyeing is set to 80 ° C. or higher, and bulking by steaming can be performed by steaming at 80 ° C. or higher.

In the bulky yarn of the present invention, the fiber (A) occupies the core of the spun yarn by heat-treating the spun yarn comprising the acrylic fiber (A) and the acrylic fiber (B), and the fiber (B) is It has a structure occupying its sheath, which makes it possible to obtain a soft and tall bulky yarn. Hereinafter, examples of the present invention will be described.

The evaluation of the softness and the feeling of waist (referred to as feeling evaluation) of the products in Examples and Comparative Examples is based on the following sensory evaluation test. Sensory evaluation method: The evaluation was performed by 10 monitors, the scores based on the following evaluation criteria were totaled, and a comprehensive evaluation was assigned based on the total score.

Individual evaluation Poor Slightly poor Good Very good Individual score 0 1 2 3 Overall evaluation × △ ○ ◎ Total score 1 to 7 8 to 14 15 to 20 22 to 30

[0017]

Examples [Examples 1 to 3] Combinations of the raw cotton for spinning shown in the following table, with a meter number (Nm) of 42 to 52,
A yarn having a twist of 695 to 576 t / m was spun, and the obtained spun yarn was dyed by a first dyeing method at 98 ° C to prepare a dyed bulky spun yarn. The count and the number of twists of the dyed spun yarn were as follows. The dyed spun yarn was knitted with an 18GG 1P knitting circular knitting machine, and the texture of the obtained knitted fabric was organoleptically evaluated.
In the table, non-shrinkable cotton (non-heat-shrinkable fiber) 1.5 d and 0.1.
The thermal shrinkage of 9d is 0.6% and 0.8%, respectively.

[0018]

[Table 1]

[Examples 4 and 5] A yarn having a twist of 1/52 Nm with a twist number of 685 t / m was spun with a combination of the raw cottons shown in the following table, and the yarn was knitted in a circular knit of 18GG, 1P knitting. A ground was made, the dye was anti-dyed, and the texture of the knitted fabric was sensory evaluated. The heat shrinkage of the non-shrinkable cotton 0.9d in the table is 0.8.
%.

[0020]

[Table 2]

[0021]

According to the present invention, there can be provided a bulky spun yarn made of an acrylic synthetic fiber having a softness and a feeling of waist and having a fineness of 1 denier or less. INDUSTRIAL APPLICABILITY The bulky spun yarn of the present invention has a large number of fine fibers having a fineness of 1 denier or less, and has a bulky structure with a large number of voids, so that it is useful as a yarn material capable of producing clothing having excellent heat insulation. It is.

The bulky spun yarn according to the present invention is soft,
Because it has a feeling of waist, it is soft of acrylic fiber,
Jerseys and sweaters that provide waist underwear, jerseys and sweaters can be made.

Claims (1)

[Claims] 1. A heat shrinkage ratio of 1 to 0.4 to 1 d for single yarn denier
5 to 40% acrylic fiber (A) is 20 to 80% by weight
And 20 to 80% by weight of an acrylic fiber (B) having a heat shrinkage of 5% or less with a single yarn denier of 0.4d to 1d,
At least acrylic fiber (A) Acrylic fiber (B)
Is a bulky spun yarn having a sheath-core structure composed of a total of 80% by weight or more.