JPS62177242A - Production of bulky processed 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 provides a yarn having three or more types of dyeing differences along the longitudinal direction and a crimp difference between the filaments constituting the yarn. The present invention also relates to a method for producing a bulky textured yarn that can give a fabric a pattern ranging from a marbled pattern to a raspberry pattern and a texture similar to that of a spun wool yarn.

<Prior art> Conventionally, yarns with surface effects in woven or knitted fabrics include:
In order to obtain woven or knitted fabrics with fine marbling-like patterns or coarse patterns with a kasuri-like pattern, yarns or short fibers obtained by mixing two or more types of short fibers or filament yarns with different dyeability are intermittently mixed. 2. Description of the Related Art There are known methods for producing two types of yarns such as slub yarns.

<Problems to be solved by the invention> However, the yarns obtained by these methods are
Since both are obtained by mixing two or more types of fibers with different dyeability, workability and management are extremely complicated in the actual production of yarns and woven and knitted products.
The pattern patterns for knitting are limited.

□Furthermore, synthetic fiber filament threads with different dyeability are mixed, giving them a cold appearance and a waxy feel to the touch.In particular, the uniformity of the filament threads gives them a hard texture.

It lacks softness and volume, and has the disadvantage of being inferior in texture to woven and knitted fabrics obtained from spun yarns, especially woolen yarns.

The present invention solves the drawbacks of the prior art, and its purpose is to provide one multifilament yarn with three or more types of dyeing density differences and crimp differences, and to create wool-like yarn-like yarns. To produce a bulky processed yarn that can freely form textures ranging from marbling to kasuri patterns.

Means for Solving the Problems〉 That is, the present invention has a birefringence (Δn) of 15 to 80×10
Water or an aqueous liquid is intermittently applied to the highly oriented undrawn polyester yarn of the bow along its longitudinal direction, the yarn is then heat-shrinked, and then cold-stretched, and then stretched and false-twisted. This is a method for producing bulky textured yarn.

The method of the present invention will be explained in more detail below.

First, in the method of the present invention, the supplied raw yarn is birefringent (Δn
) is required to be a highly oriented undrawn polyester yarn of 15 to 80×10 −3 . If the birefringence (Δn) of the highly oriented undrawn polyester yarn is less than 15×104, the portion to which water or aqueous liquid is not attached becomes brittle during heat shrinkage, which will be described later, and yarn breakage occurs frequently during the subsequent drawing and false twisting process. ,on the other hand.

If it exceeds 80 x 10-', the amount of heat shrinkage will not be sufficient.

Stretching and false twisting is not preferred because it does not provide a clear dyeing difference.

Next, water or an aqueous liquid is intermittently applied to the highly oriented undrawn polyester yarn along its longitudinal direction.

Here, the aqueous liquid is one containing 50% by weight or more of water, and substances other than the water plate include surfactants, dyeing aids, rust-spinning agents, etc., as long as they are compatible with water. It may be something that is. In order to attach water or an aqueous liquid (hereinafter referred to as liquid) to highly oriented undrawn polyester yarn, it is possible to intermittently pass the upper part of a rotating roller whose lower part is immersed in the liquid, or by intermittently spraying the liquid. Any method may be used as long as the liquid can be applied intermittently to a highly oriented undrawn yarn at an appropriate length. In particular, a method using a microcomputer and a random pulse generation unit is particularly suitable. This is particularly suitable because it allows liquid to be deposited at appropriate intervals and lengths.

The highly oriented undrawn polyester yarn to which the liquid has been applied intermittently is then heat-shrinked. i.e. 9
In the method of the present invention, the degree of heat treatment is varied between the parts to which water is intermittently deposited and the parts to which water is not deposited, thereby causing heat shrinkage and reducing the degree of orientation. In this case, in order to sharpen the dyeing difference and strengthen the crimp difference, which is the object of the present invention, it is preferable to increase the relaxation rate during heat shrinkage.

In order to fully obtain the effects of the present invention, it is desirable that the relaxation rate be 30% or more. In addition, the heat treatment temperature during heat shrinkage is 13
It is preferable to set it as 0 degreeC - 240 degreeC. Also, what is the tension of the running yarn during heat shrinkage?

This corresponds to the thermal shrinkage stress of the yarn and is extremely small. Therefore, in order to make the yarn run stably, the relaxation rate is preferably 130% or less, and furthermore, the relaxation rate should be non-contact so that the yarn does not come into contact with the heating device. It is preferable.

Furthermore, in the method of the present invention, the heat-shrinked yarn is cold-stretched. Cold drawing here includes not only drawing at room temperature, but also drawing under stress that can cause unevenness in the yarn. means stretching.

The stretching ratio for cold stretching is within the natural stretching region defined by the elongation-stress curve of the heat-shrinked yarn, but is approximately 1.3 times to
A range of 2.6 times is adopted.

In this case, the cold stretching region is generally constructed between a pair of rollers having two different surface speeds, but a guide may be interposed between the cold stretching region and the following stretching false twisting region to form a cold stretching region. Any apparatus may be used as long as it can substantially perform cold stretching.

As a result, fineness unevenness occurs in the individual filaments that make up the yarn, and the large portions become darkly dyed areas.

The detailed parts become the lightly dyed parts. 'Then, the cold-drawn yarn is further subjected to a drawing and false twisting process.

In this case, the stretching ratio is 1.1 to 1.7. In addition, the number of false twists during drawing false twisting is 1, which is the number of false twists normally used in false twisting, and the fineness of the yarn after false twisting and untwisting is D (denier).
If so.

Approximately 20,000/fK to 35,000/fK are used. On the other hand, as the false twisting temperature, the temperature at which highly oriented undrawn yarn is normally subjected to drawing false twisting is adopted, and a temperature of about 170°C to 230°C is used.

By performing the stretching false twisting process in this way.

The parts of the yarn to which liquid is intermittently attached are hardly affected by the heat treatment during heat shrinkage, and become highly oriented during stretching and false twisting, resulting in lightly dyed parts.On the other hand, the parts to which liquid is not attached are not affected by heat shrinkage. Since it shrinks and crystallizes, there is less stretching deformation during stretch false twisting, and the dyed area is darker than the lightly dyed area. In addition, since dark and light areas are formed by the thick and fine fineness irregularities generated during the cold drawing described above, together with the formation of the light dyed areas, a yarn having at least three types of differences in shade is obtained.

In addition, by drawing and false twisting the yarn that has been cold-drawn to produce thick and fine fineness unevenness, the filaments placed around the outer periphery of most of the heated filaments are deformed while being stretched relatively, resulting in a crimp difference. Moreover, the filament located at the outer periphery has a crimp difference depending on the large part or even the small part.

Therefore, when a woven or knitted fabric is made using the bulky processed yarn according to the method of the present invention, an appearance pattern effect with three or more chromaticity differences due to the difference in dye density and a wool-like yarn-like effect due to the crimp difference between single filaments can be obtained. A woven or knitted fabric with a texture effect can be obtained.

FIG. 1 is a process schematic diagram showing an example of the manufacturing process of the method of the present invention, in which highly oriented unstretched polyester (F) pulled out from a spool (1) passes through a feed roller (2) to a liquid adhesion device. (3), the liquid is deposited intermittently, then enters the first heating device (4), and is thermally contracted at a predetermined relaxation rate by the feed roller (2) and first delivery roller (5). 5) After the first
It is then cold stretched at a predetermined stretching ratio between the delivery roller (5) and the second delivery roller (6).

The second delivery roller (6) passes through the second delivery roller (6).
6) and the third delivery roller (9) at a predetermined stretching ratio, and simultaneously heated by the false twisting device (8) and heat-set by the second heating device (7).
After passing through a delivery roller (9), it is wound up into a package (11) as a bulky processed yarn by a winding roller (10).

FIG. 2 is a schematic external view showing an example of a bulky processed yarn produced by the method of the present invention, in which (A) is a lightly dyed area to which liquid has been applied, and (B) is a dark dyed area to which no liquid has been applied. This is a light and dark mixed part in which a light dyed part and a light dyed part are mixed, and a light dyed part (A) and a light and dark mixed part (B) are formed alternately along the longitudinal direction of the yarn.

Further, in the light and shade mixed area (B), the large part (a) and the small part (b) of the single filament are mixed, and the large part (a) is dark colored and the small part (b) is light colored. The details (b) located relatively on the outer periphery of the yarn exhibit high crimp, and the details (b) located on the inner periphery exhibit low crimp, and these change in the longitudinal direction of the single filament. .

The dyeing density order of this bulky processed yarn is determined by the density mixing part (
The main part of B) (A) is the darkest, and the details of the middle part (B) are 9th.
, and the light dyed area (A) to which the liquid is attached becomes the lightest color.

The polyester in the present invention refers to a polymer having an ester bond in one molecule chain, and includes homopolymers typified by polyethylene terephthalate, copolymers thereof, and precitopolymers.

Further, birefringence (Δn) was measured by interference fringe measurement using a polarizing microscope compensator.

<Example> Hereinafter, one method of the present invention will be specifically explained based on an example.

Example Highly oriented undrawn polyethylene terephthalate yarn with birefringence (Δn) of 50×10−3 obtained by high-speed spinning 230d/4
8f is supplied to the feed roller in the process shown in FIG. The material was heat-shrinked at a first heating device temperature of 170° C. with a relaxation rate of 60%, and then cold-stretched using a first delivery roller and a second delivery roller at a stretching ratio of 1.6.
The stretching ratio is 1.15 by the second delivery roller and the third delivery roller, the spindle rotation speed is 25, and Qx 10.
'r, p, m, number of false twists 2270T/M (twisting direction, Z
direction), the yarn was drawn and false-twisted at a second heating device temperature of 180° C. to obtain a bulky textured yarn according to the method of the present invention.

In the obtained bulky processed yarn, the length of the lightly dyed part to which the liquid is attached is 8 to 12c11, and the length of the thick part of the dark and light mixed part is 0.
It was 5 to 3.5 cm.

Next, this bulky processed yarn has a warp density of 68 pieces/inch.

When woven in a flat weave at a weft density of 60 yarns/inch and finished by dyeing with a blue disperse dye, the pattern was patterned in a Kasuri-like pattern with extremely clear textured light-colored areas, with relatively fine thick and thin patterns. It was mixed with heather due to uneven fineness, giving an extremely novel appearance pattern. Also.

The resulting fabric was soft to the touch, had a sense of volume, and had a texture similar to that of spun wool yarn with firmness and elasticity.

<Effects of the Invention> As described above, in the method of the present invention, a liquid is intermittently applied to highly oriented undrawn polyester yarn.

By heat-shrinking, cold-stretching, and stretching/false-twisting, the high shrinkage characteristics and crystallization orientation characteristics of the highly oriented undrawn polyester yarn are skillfully utilized to create at least three types of fibers in the longitudinal direction of the yarn. In addition to forming a difference in dyeing density, in particular, by cold drawing, unevenness of thick and fine fineness is generated in the yarn, and by drawing and false twisting, a crimp difference is imparted to the single filament. Using the bulky processed yarn obtained by the invented method, it has a variety of patterns from marbled to dull, soft and voluminous to the touch, and a firm, firm wool-like texture. You can get v@knitted fabric.

In addition, the method of the present invention applies a liquid intermittently to bring about differences in the dyeing density of the threads and appearance of crimp spots on the single filaments.

They can be adjusted as appropriate.2 According to the method of the present invention, processed yarns that can freely change the pattern pattern and texture of woven fabrics can be easily produced.

[Brief explanation of drawings]

FIG. 1 is a process schematic diagram showing an example of the manufacturing process according to the method of the present invention, and FIG.

Claims (1)

[Claims] (1) Water or an aqueous liquid is intermittently applied along the longitudinal direction of a highly oriented undrawn polyester yarn with a birefringence (Δn) of 15 to 80 x 10^-^3, and then the yarn is heated. A method for producing bulky textured yarn, which comprises shrinking, cold stretching, and then subjecting to stretching and false twisting.