JPS58186666A - Production of hard twisted fabric - 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 The present invention relates to a method for producing a highly twisted knitted fabric made of polyester fibers, and more specifically, the present invention relates to a method for producing a highly twisted knitted fabric made of polyester fibers. It concerns knitted fabrics and their manufacturing methods.

Conventionally, the method of raising the texture of knitted fabrics containing polyester fibers involves untwisting the highly twisted yarn by applying a mechanical impact rubbing action in hot water using a texture raising device such as a rotary washer or a continuous relaxer. It was obtained by making grain appear. However, how well and uniformly the untwisting is achieved greatly determines the quality of the grain texture. However, it is well known that polyester fibers have poor wrinkle resistance compared to silk, nylon, etc. that have been conventionally used for this purpose. In order to improve these drawbacks, the present inventors have conducted extensive research and have arrived at the present invention.

That is, the present invention is a polyester containing ethylene terephthalate as a main component and has a birefringence of 150x10'-' I)).

The lower yarn is highly twisted with a twist rate of NK = 16,000 or more.

After twisting is carried out at a temperature of 40°C to 75°C, a knitted fabric is made using the highly twisted yarn, and then the vagina knitted fabric is heated at 40°C
The first graining is carried out in the temperature range of ~80℃ and at the peak temperature of the heat treatment stiffness of the highly twisted yarn, and then at 80℃~
A method for producing a highly twisted knitted fabric, characterized in that the second crimp is carried out at a temperature in the temperature range of 95° C. at which the fabric becomes soft.

Further, the present invention will be described in detail.

In the present invention, knitted fabrics containing strongly twisted polyester fibers containing ethylene terephthalate as a main component are those containing 80 mol% or more of ethylene terephthalate units, and are not only 100% &m yarns but also yarns mixed with other fibers. , a 1# fabric made of a composite yarn (for example, silk, polystyrene, polyolefin, polyacrylonitrile, polyamide, etc.), and in the case of a mixed yarn or composite yarn, it preferably contains 5096 or more polyethylene terephthalate. 09 For yarns with a refractive index of 150xlD' or less, the spinning speed is 5000 m/
The yarn spun at a spinning speed of min or more, or if the spinning speed is less than that, the spun intermediately oriented undrawn yarn is stretched to have a birefringence of 150×10 or less. These yarns are highly twisted with a twist coefficient of 16,000 or more.

When the twist is stopped, it becomes as shown in Figure 1. That is, if the twisting temperature shown in FIG. 1 is lower than 40° C., the twisting temperature will be incomplete and the temperature will be higher than 95° C., which poses a problem in handling. In other words, the cracks are sensitive to the cracks and become difficult to control. On the other hand, 80
If the temperature is above 0.degree. C., on the other hand, the twist will be completely stopped, but the twist will be less than 25 degrees, making it easier to handle, but insufficient untwisting will occur during graining, resulting in insufficient graining and uneven graining.

The graining after knitting and weaving using the highly twisted yarn obtained above is performed by sufficiently untwisting the highly twisted yarn at the peak temperature of the heat treatment frizz, which is used as a guideline for the generation of grains during graining. By embossing and re-embossing at a temperature that reduces the binding force of the fabric, a knitted fabric with a uniform and even texture can be obtained.

This will be explained using FIGS. 2, 3, and 4.

Figure 2 (7) (A) i50℃, (B) 60℃, (c)
ii70℃.

(This is a highly twisted yarn that was twisted at o+i 80℃, and the degree of heat treatment stiffness peaks in the range of 5 to 15℃ above the twisting temperature of ゎ, indicating that the untwisting of the 1 strongly twisted yarn is the largest. This is because the untwisting of highly twisted yarns does not occur sufficiently below the twisting temperature because the fixation of the twist by twisting is insufficient, and the untwisting does not occur at temperatures above the twisting temperature. The reason why twisting does not occur sufficiently is because the twisting temperature is passed through the twisting point in a short time, and the twisting progresses again above the twisting point temperature.As shown in Figure 2, the twisting temperature is higher than the twisting point temperature. There is a peak in the degree of vibration.

Twisting is done in a cylinder with a large binding force, while heat treatment is a method with a smaller binding force than twisting, and this is due to the difference between high-pressure steam treatment and hot water treatment. Third
The bending stiffness of a knitted fabric, which is used as a measure of the binding force of a highly twisted knitted fabric in the figure, rapidly decreases when the temperature exceeds the crow transition point of polyester, that is, above 80°C. Now that both of the above have been clarified, if we look at this in terms of the graining method, we get the result shown in Figure 4. The heat treatment shown in Figure 2 and the heat treatment temperature of 1, 1', 1'' were changed to the graining temperature shown in Figure 4.
tT, and the highly twisted yarn is sufficiently untwisted at the temperature T, that is, the peak temperature of the degree of heat treatment frizz during graining.

It should be in a state where there is no unevenness in untwisting. Thereafter, the temperature is increased, and untwisting and kneading are performed sufficiently at a temperature T at which the binding force of the knitted fabric is further reduced. After that, it is better to raise the temperature and use a method of rubbing at a temperature close to boiling water in order to generate grains and stabilize the grains.

As described above, the object of the present invention is to eliminate the disadvantages of highly twisted knitted fabrics such as uneven graining and wrinkles of Fi strongly twisted knitted fabrics, and to provide MK fabrics with an elegant texture. This method proposes low-temperature yarn spinning, heatless yarn spinning, and low twist prevention during high-level processing, and is one way to save energy and provide highly twisted knitted fabrics.

The polyester of the present invention may be copolymerized with a known copolymer compound.

An example of an embodiment of the present invention will be described below.

Example 1 A polyethylene terephthalate 75 denier 56 filament yarn with a birefringence of 105 x 10' was spun at a spinning speed of 6200 m/min.
After applying strong twists (s twist, 2 twist), the twist was stopped at 60° C. for 50 minutes using a vacuum setter. Next, a georgette crepe was woven using the twisted, highly twisted yarn as warp and weft yarns. Next, when graining was carried out under the conditions shown in Table 1, a high quality georgette crepe with an elegant and uniform grain texture was produced using the method of the present invention.

Comparative Example 1 Polyethylene terephthalate (birefringence 13
Example 1. Texture treatment was performed under the same conditions as Test A4. However, only low-quality and poor-quality material could be obtained, with many grains and unevenness and insufficient untwisting of strong twists.

[Brief explanation of drawings]

Figure 1 shows the twisting temperature of the highly twisted yarn of the present invention and the twisting temperature after twisting.
It is a figure showing the relationship of JIN. Figure 2 shows the heat treatment temperature (temperature at which the untwisting of the highly twisted yarn is sufficiently inhibited) and the degree of heat treatment stiffness (a method for evaluating the graininess) of the highly twisted yarn of the present invention after untwisting. FIG. , is a diagram showing how things bend. FIG. 5 shows the heat treatment temperature of the highly twisted fabric of the present invention, and FIG. 4 shows an example of the embossment method of the present invention.

Claims (3)

[Claims] (1) Polyester whose main component is ethylene terephthalate with birefringence of 1 D A knitted fabric is then made using the highly twisted yarn at a temperature of 40°C to 5°C, and then a knitted fabric is made at a temperature of 45°C to 85°C and at the peak temperature of the heat treatment frizz of the highly twisted yarn. A method for manufacturing a highly twisted #& material, which involves making a first grain and then making a second grain at a temperature where the binding force of the textured material decreases. (2) The first graining temperature is the twist stop temperature. A method for producing a strong twist plow/fabric according to claim (1), wherein the twisting temperature is within a range of +15°C or less. (3) The second embossing temperature T is within the range of 8.1 to 95°C at which the binding force of the knitted fabric decreases. Strong twist pot # & Monono manufacturing method.