JPS58174643A - Hard twisted yarn and production thereof - 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 an energy-saving strong linen yarn and a strong linen knitted fabric using the yarn.

More specifically, this article relates to the truly excellent German linen yarn SONG, which made it possible to obtain fine grained texture and surface quality by direct spinning, and strong linen knitted fabrics using the yarn. .

Conventionally, various methods have been proposed for producing strong linen knitted fabrics using synthetic fiber (% polyester) yarns, but none have been found to produce an elegant and uniform grain texture comparable to that of silk, a natural fiber. The current situation is that it has not been released. Special publication No. 51'-25619, Japanese Patent Publication No. 56-81 as yarn for strong cotton
As shown in Japanese Patent Application No. 40, a raw yarn for strong cotton yarn is produced in which the density of the yarn is made higher than that of conventional yarn by performing heat treatment at high temperature after spinning and drawing, or by heat treatment at high temperature during drawing. Proposed. However, with such high thread density, it is difficult to set the twist stopper.

■For this reason, it is necessary to be more careful when handling warping and weaving than conventional yarns, and ■when creating the grain, the horns are all the same.

Ground cracks are likely to occur. ■Due to the improved dimensional stability of the product, there has been a demand for the development of energy-saving, Luky-type strong fiber yarns and high-order processing technology for surface yarn and high-order processing. 1 result.

We have arrived at the present invention.

That is, the present invention directly spins polyester containing polyethylene terephthalate as a main component, and makes the molecular arrangement of the yarn relatively low and the density relatively high without applying any heat treatment during spinning. This article relates to a strong cotton yarn that can be easily set in the L size and can easily generate wrinkles even in a 7-way setting, and a manufacturing method.

That is, the present invention provides a polyester yarn containing ethylene terephthalate t as a main component, the yarn having a density of 1.
677 or more, birefringence 95-15 D (×10'-')
Highly twisted yarn characterized by a heat treatment frizz degree of 5000 or more, and a polyester yarn containing ethylene terephthalate as a main component having a density of 1.377 or more.

A yarn having a birefringence of 95 to 130 (Xl[]'-'') is heated to a twist coefficient of 1+6UL)O or more, and then the highly twisted yarn is twisted at a temperature below the glass transition temperature. A method for manufacturing highly twisted yarn characterized by:

To describe the present invention in detail, the polyester constituting the present invention contains 80 moles or more of ethylene terephthalate units. Examples of common ingredients include adipic acid, sepacic acid, and isophthalic acid.

Dibasic acids such as 5-sodium sulfoisophthalic acid, diphenyl dicarboxylic acid, naphthalene dicarboxylic acid, oxyacids such as oxybenzoic acid, and diethyl fuglycol. Propylene glycol.

Neopentyl glycol, pentaerythrol.

One or more types of glycols such as polyethylene glycol monomethyl ether can be used.

By spinning the yarn, the degree of molecular orientation of the yarn is 95 to 13.
0x10-" and the density of the yarn can be 1.377 g/♂ or more.The properties of such raw yarn are that it has excellent twist retention, which is important for a 9-strong twist yarn, and has excellent twist resistance. It has been proposed that this is not suitable for a highly twisted knitted fabric because it does not meet the requirements of the present invention.

In the highly twisted yarn of the present invention, the density, birefringence and frizz are 7.
A good appearance can only be obtained by setting it within the range described in 1. Here, the density is 1.377 or more and the birefringence is 95~
15 [ ] ( If this is the case, a high heat-resolving torque will be developed and a high-quality grain will be obtained.A heat treatment hardness of 5,000 or more is required to produce a loose grain.

Further, in the method of the present invention, the density of the polyester yarn is 1
．． 577 or more, and a birefringence of 95 to 150 (Xl [1 town)], it is necessary to heat the yarn with a twist coefficient x = 16,000 or more. The reason why the C&J degree and birefringence of the yarn are necessary has been described above. The twist coefficient is necessary to obtain a good grain, and a twist coefficient of less than 16,000 is not preferred. Further, in the uninvented method, the highly twisted yarn is then untwisted at a temperature below the glass transition point. The glass transition point is also called the secondary transition point, and in the case of polyethylene terephthalate, it is about 75~
The temperature is 80°C. Therefore, in the case of the present invention, the twisting temperature is 75°C.
The following is sufficient. Conventionally, threads have been subjected to heat above the glass transition point due to drawing, etc., and therefore could not be prevented from twisting below this temperature; however, in the present invention, this has become possible for the first time since it is not subjected to heat.

An example of the manufacturing method of the present invention will be explained with reference to the drawings.

Figure 1 shows an example of a direct spinning process. To explain using this, the polyester yarn 2 discharged from the nozzle 1 passes through the cooling device 3 and is solidified, then is lubricated by the lubricant applying device 4, passes through the first Godey roller 5 and the second Godey roller 6, and is wound into nine windings. It is wound up by the device 7. The speed of the winding device is 5500 r due to both molecular arrangement and density.
rVmin or more, preferably 5,700 m/min or more, exhibits preferable properties as a highly twisted yarn with 9 strong twists.

The characteristic tubes shown in FIGS. 2, 3, 4, and 5.

This will be explained in detail using Figure 6. As is clear from the relationship between spinning speed and degree of molecular orientation in Figure 2, when the spinning speed is 5500
m/min or more, the birefringence of the yarn is 95x 10
``'' or more, and the range shown by diagonal lines or more is preferable as a yarn for strong twisting. FIG. 6 shows the birefringence obtained by direct spinning and the degree of flatness after the strong twist is stopped. As is clear from FIG. 6, as the birefringence (Δn) increases, the twist fixing properties become slightly worse. However, in terms of handling properties, it is the same as or better than the highly twisted yarn obtained by conventional spinning and drawing, and it is possible to stop twisting below the glass transition point, which was difficult with conventional yarns. FIGS. 6 and 4 show the characteristics when twisting was done at 60°C. The untwisting torque of the highly twisted yarn after untwisting, that is, the degree of heat treatment friability used to evaluate the graininess, was evaluated as
As shown in the figure, heat treated vinyl IJ with preferable graininess.
li is preferably 5,000 or more, and ``-'' is preferably greater than the shaded area. - From the perspective of the density of the male line yarn, as shown in Figure 5, when the spinning speed exceeds 5 [JOOm/min, the density of the yarn is 1.370 or more'', which means 1 normal spinning - Noboru. It will be about the same level as the light streaks.

It has been found that when the spinning speed is increased to <(5500 m/r+), the density becomes 1377 or more, which shows that the yarn is extremely excellent in terms of anti-twisting properties and graininess. Figure 6 shows the density (
It shows the relationship between ρ) and the degree of heat treatment brittleness.

The yarn density suddenly increased from 1377 to 500 after heat treatment.
It has a large value of 0 or more, and has a great effect on highly twisted yarns, similar to the above-mentioned birefringence. These peculiar effects are due to the twist coefficient = 16
It is first expressed by applying a strong twist of 000 or more.

In addition, the directly spun yarn obtained by the present invention has many other properties necessary for producing high-twist knitted fabrics in addition to the above. Examples of these properties are (1) Sometimes due to not receiving high temperature heat.

It is easy to prevent twisting, which is important for the winding of the water jet loom, and prevents uneven shrinkage of the yarn layer due to twisting, resulting in stable, high-quality knitted fabrics.

(3) Young's modulus is 1 despite being polyester
It is small, less than 00g/d. This makes it possible to make full use of the untwisting torque of the highly twisted yarn when twisting the highly twisted knitted fabric.

As mentioned above, the yarn obtained by direct spinning as in the present invention enables significant energy savings in both yarn and higher processing, and will be an important yarn for providing future high-twist knitted fabrics at low cost. This is one of the articles.

Examples of the present invention will be described below.

In the examples, thread density was determined by inserting a thread cut into short pieces into a mixed solution of n-hebutane and carbon tetrachloride at 20°C.

It was measured by determining the specific gravity of the solution at one point. Moreover, birefringence was measured by transmission interferometry.

Example 1 Polyethylene terephthalate was melt-spun using the apparatus shown in FIG. The spinning speed was 5000°5500.
Yarns with circular cross sections of 75 denier 36 filaments were spun at 5,700, 6,000, and 6,500 rn/min to obtain yarns as shown in Table 1. ”-2500t/m for marking thread
A strong twist (twisting coefficient = 21650) was applied, and the twisting was then stopped at 60° C. for 50 minutes. Georgette crepe is woven using this highly twisted yarn.

The highly twisted fabric was embossed at 70°C, and then heated and dried.
Further rubbing treatment was performed at 8°C. The highly twisted yarn special III:
Table 1 shows the properties of the strong fabrics subjected to the graining treatment. As can be seen, the yarn of the present invention made it possible to obtain a georgette crepe with an elegant and uniform texture.

Table 1 As is clear from Table 1, in Experiments Nos. 2 to 5, the conditions were within the scope of the present invention, so that good grains were obtained.

On the other hand, in experiment number 1, the birefringence density, heat treatment bi-IJ
Since all i were outside the scope of the present invention, the grains were not desirable.

Comparative Example 1 Example 1. Under the conditions of experiment number 6, 1840t/m
The conditions were the same except that a strong twist (twist coefficient = 15955) was applied, and the texture was created. However, the instantaneous breakage degree in heat treatment is 4.
It only reached 620 and no good results were obtained.

Example 2 Example 1. Under the conditions of experiment number B, 1900t
The same conditions were applied except that a strong twist of /m (twist coefficient = 16454) was applied, and the texture was created. The heat treatment toughness was 5050, which was a good value.

Example 3 Example 1. Using the yarn obtained in experiment number 6.

A strong twist of 2500 t/m (twisting coefficient = 21650) was applied, and then the twisting degree was set at 50°C, 70°C, and 74°C.
The conditions were the same as in Experiment No. '6, except that the temperature was 82°C. Incidentally, the glass transition point of this yarn was 77° C. (DSO measurement).

As a result, the heat treatment strength was 5190 at the twist prevention temperature of 50℃.
,,5540 at 70℃. At 74°C, it was 1j5550, which was preferable, but at 82°C, it dropped to 4220, and unevenness also occurred, which was not preferable.

It is presumed that this is because crystallization progresses due to heat treatment at a temperature higher than the glass transition temperature, and when graining occurs, grain torque immediately ceases to appear.

[Brief explanation of the drawing]

FIG. 1 shows an example of a direct spinning process for producing the yarn of the present invention. FIG. 2 shows the relationship between spinning speed and birefringence, and the shaded area is the range of the present invention. Figure 3 shows the relationship between birefringence and flatness after twisting.
The figures show the relationship between birefringence and heat treatment toughness, FIG. 5 shows the relationship between spinning speed and density, and FIG. 6 shows the relationship between density and heat treatment toughness. 111 1: Cap 2: Yarn □ '5: Cooling device 4: Lubrication device 5: First codei roller 6: Second codei roller 7: Winding device Patent applicant Toshi Co., Ltd. 1 [11 No. 2
(! 1 year old, 5 years old, 5 years old)

Claims (2)

[Claims] (1) Polyester yarn containing ethylene terephthalate as the main component, with a density of 1 and a filter of 77 or more.
A strongly twisted yarn characterized by having a 1-1 birefringence of 95 to 150 (xiO-') and a degree of heat treatment frizz of 5000 or more. (2) The density of the polyester yarn whose main component is ethylene terephthalate is 1. %7.7 or more, birefringence 4
Twist coefficient K = 5- to 130 (X 1O-3) yarn
Heating at a temperature of 16,000 or higher, the highly twisted yarn is then
A method for producing a highly twisted yarn, characterized by twisting the yarn at 1F at a temperature below the twisting cherry point.