JPH02277839A - Stretch yarn - Google Patents

Abstract

PURPOSE:To obtain a stretch yarn of high durability without heat deterioration and enbritlement by partially using cellulosic fibers which have been produced by chemically crosslinking cellulose molecules and twisting the fibers in the direction reverse to the twisting before crosslinking. CONSTITUTION:For example, cellulose fibers such as cotton or viscose rayon are allowed to run continuously for treatment with a solution of a crosslinking compound such as urea-formaldehyde resin to crosslink the cellulose molecules chemically, and dried. Then, the fibers are twisted in the reverse direction to the twisting before the crosslinking.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a stretchable yarn at least partially composed of cellulose 41 fibers, which is used in stretchable aR materials for forming stretchable sportswear, underwear, work clothes, etc. Regarding.

Conventional technology Traditionally, polyurethane elastic fibers and thermoplastic synthetic 4I fiber filament-processed yarns have been commonly used as stretch systems for stretch knitted fabrics that form stretch sportswear, underwear, work clothes, etc. There are also products made by twisting and twisting these elastic yarns with other spun yarns to give them elasticity. In addition, materials that take advantage of the snarl phenomenon by strongly twisting spun yarn are also used.

Problems to be Solved by the Invention Among the conventional elastic yarns as described above, polyurethane elastic yarns have a high elongation rate and a good recovery rate, but are susceptible to heat and become brittle.
There are many problems such as discoloration and stretching fatigue, and thin threads cannot be obtained. Processed yarns made from thermoplastic fibers are somewhat slow to recover from elongation.
It is also sensitive to heat.

On the other hand, when imparting elasticity to yarns made of cellulose-based 4I fibers, there is a method of utilizing the Snarl phenomenon of highly twisted yarns as described above, but this method has considerable limitations in terms of its function and use. Kerulose type sI again? There are many problems in the case of mixing and twisting polyurethane elastic yarns and processing systems with ll and polyurethane elastic yarns, as there is a limit to the mixing ratio, and it is difficult to obtain yarns with a braided number.

An object of the present invention is to solve the above-mentioned problems and provide an elastic yarn in which at least a portion of the yarn is made of cellulose tS+t and has elasticity.

Means for Solving the Problems In order to solve the above problems, the elastic yarn of the present invention is a yarn at least partially made of cellulose-based allft, in which the cellulose molecules of the cellulose fibers are chemically cross-linked. It is made by M twisting in the opposite direction to the twisting of the rack 1 moe.

As the elastic yarn of the present invention, at least a portion of which is made of cellulose fibers, yarns made of cellulose fibers, blends with other natural fibers, synthetic fibers, etc., or intertwisted yarns can be used. Examples of cellulose-based fibers include cotton, linen, and rayon.

The elastic yarn of the present invention is a yarn at least partially made of cellulose 111111.
The cellulose molecules are chemically crosslinked and twisted in the opposite direction to the twisting before crosslinking. Here, the state in which cellulose molecules are chemically crosslinked means that a compound having at least two reactive groups that reacts with O-175 of cellulose molecules (hereinafter referred to as a crosslinking compound) is used to create a chemically crosslinked state within or between the molecules of cellulose molecules. It refers to a state in which at least 2@OH groups are reacted in a cross-linked manner. As the crosslinkable compound, for example, urea formaldehyde resin, trimethylolmelamine resin, hexamethylolmelamine resin, glyoxal resin, polyepoxy resin, etc. can be used.

There are various methods for crosslinking cellulose molecules and tiPL cellulose molecules using the crosslinking compound, depending on the equipment used. For example, there is a method of continuously running a thread to impregnate it with a solution of a crosslinking compound, drying it, and subjecting it to dry heat treatment or wet heat treatment to cause the reaction to occur, which allows the reaction to occur at high speed and at low cost. Another method is to make the yarn into a strand or cheese, immerse it in a solution of a crosslinking chemical, and then raise the temperature to react, making it possible to easily process a large amount of yarn.

The yarn with cellulose molecules crosslinked as described above is twisted in the opposite direction to the twist it had before crosslinking. Twisting in the opposite direction can be selected as needed, from a slight untwisting of the already existing twist to forming a twist in the opposite direction. That is, the selection is made depending on the desired elongation rate, the stiffness of the cellulose fiber after crosslinking, the balance between the twisting torque before processing and after untwisting or reverse twisting.

The elastic yarn of the present invention is a bulky yarn-like elastic yarn for ill yarn, and a spiral-shaped elastic yarn for intertwisted yarn (double yarn), and is further twisted in the opposite direction as described above with unprocessed yarn. If you do this in a state where it is still unprocessed, the result will be an elastic thread that looks like unprocessed thread wrapped around it. Further, according to the present invention, stretchable yarns made only of cellulose fibers and stretchable yarns with fine counts can be easily realized.

Function Cellulose fibers are all composed of cellulose molecules, and their structure consists of a crystalline part and an amorphous part, and the crystalline part is bonded by the intermolecular force of the rods and can easily shift or break. However, one amorphous part has molecules randomly entangled with each other, and it easily swells with water, creating spaces for other molecules to enter. In the above structure of the present invention, the crosslinking of the cellulose molecules of the cellulose fiber occurs in the amorphous portion, and the chemical crosslinking of the amorphous portion reduces the degree of freedom of the molecules, and the stress against the deformation of am is reduced. As a result, entropic elasticity occurs, and furthermore, by twisting in the opposite direction, elasticity appears as if the GI fibers themselves had rubber elasticity.

Examples Example 1 20m upland cotton hand yarn (twisting coefficient 5.5) was made into double yarn and twisted at 600T/m in the Z direction. Urea formaldehyde resin (
The mixture was dipped in an aqueous solution of 20% (solid content 25%) and 1% magnesium chloride, deliquified and dried, and dried at 180° C. for 2 minutes to cause a crosslinking reaction in the cellulose molecules.

This yarn was twisted 900 times/m in the S direction.

The obtained yarn has an elongation of 80%, does not deteriorate or become brittle due to heat, and does not become fatigued even after repeated stretching and recovery.
It was an elastic yarn with excellent washing resistance and elasticity.

Example 2 A 60 count Egyptian cotton yarn (twist coefficient 25.2>) was taken in a cold, immersed in a commercially available glyoxal aminoblast resin (solid content 45%) 10% and magnesium chloride 1% aqueous solution for 20 minutes, and then thoroughly After removing the liquid and drying, it was subjected to a dry heat treatment at 180°C for 5 minutes, and then twisted in the S direction at 800 times/m.The obtained yarn had an elongation of 50% and had excellent elasticity and durability. It was an elastic thread.

Example 3 After twisting rayon filament yarn (75 denier 150 filament) at 400 T/m in the S direction, a commercially available glyoxal-based aminoblast resin (solid content 45
%) 10%, trimethylolmelamine resin (solid content 80
%) 5% aqueous solution for 30 minutes, the liquid was thoroughly removed, and after drying, a dry heat treatment was performed at 180° C. for 5 minutes to terminate the crosslinking reaction of the cellulose molecules, and then twisting was performed at 600 T/times in two directions. The blued yarn was an elastic yarn with excellent durability and elasticity with an elongation of 100%.

In addition, the elastic yarn of this example is used as the warp, and the 60
Count cotton stretch yarn as weft, warp 120/inch, 1i
! When a twill Ki weave fabric was woven at a density of 80 wood/inch, a stretch fabric with an elongation of 8% in warp and 10% in weft was obtained. The elongation recovery rate of this e4 product after 1 hour was 95%, which was extremely excellent.

Effects of the Invention Song As mentioned above, the stretchable yarn of this Komei is a yarn at least partially made of cellulose fibers, and the cellulose molecules of the cellulose fibers are chemically crosslinked, and the twisting and stretching before crosslinking. Because it is twisted in the opposite direction, it does not deteriorate or become brittle due to heat, does not become fatigued even after repeated stretching and recovery, and does not deteriorate even after repeated washing.
It has excellent durability and stretchability, and is extremely useful as a raw yarn for stretchable products suitable for sportswear, snacks, and other clothing that require stretchability.

Agent Hiroshi Mori

Claims (1)

[Claims] 1. A stretchable yarn, which is a yarn at least partially made of cellulose fibers, which is twisted in a direction opposite to the twisting direction before crosslinking, with the cellulose molecules of the cellulose fibers being chemically crosslinked.