KR970010713B1 - Manufacturing of multi-shrinkage yarn having excellent self-extension - Google Patents

Abstract

The spontaneous elongated fiber which is produced by drawing and heat-treating of a polyester half-drawn fiber(1) offered with the spontaneous elongation, and a high shrinkage-polyester drawn fiber(2) that is provided with a certain elongating force are interlaced to be united in the air exchange processing device(7). The polyester half-drawn fiber passes through a elongation roller(3) that adjusts evenly the elongation to reach the first drawing roller(4) to be cool-spun, passing the first guide roller(5) for accessing the double heat treatment device(6).

Description

Manufacturing method of biaxial blended yarn with excellent spontaneous extension

1 is a schematic manufacturing process diagram of the biaxial blended yarn having excellent spontaneous elongation of the present invention,

2 is a structural photograph of biaxial horn sum yarn manufactured in the present invention.

* Explanation of symbols for main parts of the drawings

1: polyester semi-stretched yarn 2: high shrink polyester stretched yarn

3: Tension guide roller 4: 1st extension roller

5: first guide roller 6: dual heat treatment apparatus

7: first heat treatment section 8: second heat treatment section

9: 2nd guide roller 10: Air jamming device

11: 2nd extension roller 12: tension guide roller

13: winding device

The present invention relates to a method for producing bisulfate blended yarn having excellent spontaneous elongation, and more specifically, to preparing a polyester semi-stretched yarn as a copolymer capable of improving spontaneous elongation and spinning at 2000 to 4000 m / min, followed by stretching. Cold drawing treatment at the stretching ratio of 70 to 90% and the stretching temperature of 50 to 70 ℃, and then splicing spontaneous stretch yarn and high shrink polyester stretch yarn prepared by the second heat treatment at 120 to 170 ℃ to excellent fabric surface The present invention relates to a method for producing biaxial blended yarn having excellent spontaneous elongation with a tactile feel and a uniform loop.

Conventional methods for producing spontaneous yarns include spinning yarns by high-speed spinning so that crystals can be imparted to the molten polymer, thereby producing yarns, and then shrinking the yarns closer to the fiber's amorphousness (US Pat. No. 2,952,879). (UK Patent No. 814,230, etc.), a method of stretching at a low draw ratio such that it is close to amorphous in spinning and crystallization is oriented in the fiber axis direction at 35% or less so that complete crystallization is 90% or less (UK Patent No. 814,288, a method of manufacturing by spinning at a high speed so that some crystallization may be formed in the molten polymer to maintain the orientation in the fiber axis direction (JP-A 37-4993, 37-11293, 38-15349, etc.) It is.

However, the known methods are low spontaneous elongation because of the spinning and stretching process, and lack of crystallinity, such as a thick and thin defect on the surface of the fabric.

Recently, semi-stretched yarns produced by spinning ordinary polyester at a flux of 3000 to 3500 m / min and conventional polyester stretched yarns or modified high-shrinkable polyester stretched yarns are mixed in the stretching process to achieve excellent shrinkage. Although a method of manufacturing the blended yarn is known, there is a problem in that the weaving and the dyeing process are not smooth to the surface of the fabric of the final fabric paper, and oblique lines are generated.

Accordingly, an object of the present invention is to solve the disadvantages of the conventional method for producing spontaneous yarn and to provide a method for producing biaxial blended yarn having excellent spontaneous elongation to give an excellent touch and uniform loop to the fabric surface.

In order to achieve the above object as well as another object that is easily expressed in the present invention by splicing spontaneous elongated yarn and high-shrink polyester stretched yarn obtained by manufacturing and stretching and heat-treated polyester semi-stretched yarn imparting spontaneous stretchability A biaxial blended yarn having excellent tensile strength was prepared.

The present invention will be described in more detail as follows.

The bi-shrink blended yarn having excellent spontaneous elongation of the present invention is prepared by cold-stretching a semi-stretched yarn prepared by spinning modified polyester having spontaneous elongation and then heat-treating through a heat-treatment section and then plying with a highly shrinkable polyester stretched yarn.

Semi-stretched modified polyester is a participant that can improve spontaneous elongation in the reaction of ethylene terephthalate and ethylene glycol to prepare polyester, and isophthalic acid is added in an amount of 1.8 to 3.6 wt% based on the total acid component, 1 , 3-isobenzofuradione was added in an amount of 1.8 to 3.6% by weight based on the total glycol components.

If the addition amount of isophthalic acid and 1,3-isobenzofuradione is less than 1.8% by weight, there is no effect of spontaneous elongation, and if it is more than 3.6% by weight, heat shrinkage increases and the fabric feel is not soft.

In spinning the prepared modified polyester copolymer with semi-stretched yarn, the speed of spinning was suitably 2000-4000 m / min. If the discharge speed is less than 2000m / min, it has excellent amorphousness and spontaneous elongation, but it is easily crystallized by the outside temperature, so hardening occurs due to temperature change, and when the diaxial shrinkage is mixed, an oblique line is generated due to excessive tension, and 4000m / If it exceeds the minute, the effect of spontaneous growth is negligible because the crystallization of molecules inside the fiber structure increases. In other words, as the spinning speed increases, the molecular density increases and the crystallization decreases, so it is particularly important to control the crystallization during the preparation of spontaneous elongation.

FIG. 1 is a schematic manufacturing process diagram of the biaxially blended blended yarn according to the present invention, and FIG. 2 is a structural photograph of the biaxially blended blended yarn of the present invention. As shown in FIG. 1, a spontaneous stretch yarn obtained by stretching and heat-treating a polyester semi-stretched yarn (1) to which spontaneous stretch is applied, and a high shrinkage polyester stretched yarn (2) supplied at a constant tension are subjected to an air jamming apparatus (7). ) To interleave and enclose.

The polyester semi-stretched yarn, which is endowed with spontaneous extension, passes through the tension roller (3) to uniformly control the tension and passes through the first draw roller (4) to be cold drawn. The cold drawing temperature is preferably 50 to 70 ° C. . If the cold drawing temperature is less than 50 ℃, spontaneous elongation is good because there is almost no crystallization, but in the final fabric, slant string and dick and din are generated, and if it exceeds 70 ℃, spontaneous growth is caused. No Great Wall Effect

After being stretched, the polyester semi-drawn yarn passes through the first guide roller 5 and passes through the double heat treatment apparatus 6. The temperature of the first heat treatment portion 7 is 60 to 110 ° C., and the second heat treatment is performed. The temperature of the part 8 was 120-170 degreeC. If the temperature of the second heat treatment unit is less than 120 ° C., it is the same as the temperature of the first heat treatment unit, and there is no effect. If the temperature of the second heat treatment part is higher than 170 ° C., the crystallization in the molecular structure is increased with polyester, so that spontaneous elongation does not occur.

The stretched and heat treated polyester spontaneous yarn and the high shrink polyester stretched yarn are spun in an air entanglement processing device 10 and passed through a second drawing roller 11 and a tension control device 12 to be wound into a winding device 13. . The air pressure of the air entanglement treatment device is effective in the range of 1.5 to 3 kg / cm 3, and if it is less than 1.5 kg / cm 3, there is a lack of uniform interlacing effect. Therefore, not only problems occur during winding, but also defects occur in post-processing, for example, weaving and dyeing. Plywood yarn is passed through the second draw roller 11, the draw ratio is 70 to 90% is suitable, less than 70% when the dyeing occurs, more than 90% spontaneous elongation is poor.

As a result of manufacturing the bi-shrink blended yarn with the present invention, spontaneous elongation was improved by about 7 to 8%, and the woven fabric using the same has better feel and a uniform loop than a conventional polyester semi-drawn yarn. Better quality can be maintained. However, the design of fabrics and the setting of post-processing conditions should be carried out taking into account the characteristics of spontaneous elongation and highly shrinkable yarns.

The following examples and comparative examples further illustrate the present invention, but do not limit the scope of the present invention.

(Example 1)

It is an additive that can improve spontaneous elongation at the time of making polyester by reacting ethylene terephthalate with ethylene glycol. 3.6 wt% of isophthalic acid based on acid component, 3.6 of 1,3-isobenzofuradione based on diol component Modified polyester was prepared by adding a weight% by a conventional polyester production method and spun at a speed of 2500 m / min to prepare a polyester semi-stretched yarn. The spun elongated yarn and the high shrinkage obtained by cold drawing the prepared semi-drawn yarn at the cold drawing temperature of 60 ° C. and the drawing ratio of 90% in the drawing process and then heat-treating the temperature of the first heat treatment part at 70 ° C. and the temperature of the second heat treatment part at 170 ° C. The polyester drawer was spun up and wound up, but the air pressure of the air entanglement device was 5 kg / cm 3 in order to adjust the uniform interlace spacing.

The fineness of the yarn was 120d / 72f, and the results of the fabric touch and the loop effect of the fabric surface were evaluated and the results are shown in Table 1.

(Comparative Example 1)

Except for not adding isophthalic acid and isobenzofuradione was prepared in the same manner as in Example 1 after the yarn was prepared in Table 1 to evaluate the physical properties.

(Comparative Examples 2-9)

Weaving was carried out in the same manner as in Example 1 except that the flux at the time of spinning, the cold drawing temperature at the time of stretching, the second heat treatment temperature and the drawing ratio were changed as shown in Table 1, and then the physical properties thereof were evaluated and the results are shown in Table 1 below. It is described in.

TABLE 1

◎: Excellent, ○: Normal, ×: Poor

Claims (5)

In a conventional process for producing polyester by reacting ethylene terephthalate and ethylene glycol, spontaneous polyester obtained by adding isophthalic acid and 1,3-isobenzofuradione to prepare a modified polyester, and spinning, stretching and heat treating A method for producing bispun blended yarn with improved spontaneous elongation, characterized by plying stretched yarn and high-stretch polyester stretched yarn. The amount of isophthalic acid added is 1.8 to 3.6% by weight based on the acid component, and the amount of 1,3-isobenzofuradione is added to the glycol component is 1.8 to 3.6% by weight. Improved method of manufacturing biaxial blended yarn. The method of claim 1, wherein spinning of the modified polyester is performed at a spinning speed of 2000 to 4000 m / min. The method of claim 1, wherein the stretching ratio is 70 to 90% and the cold drawing temperature is 50 to 70 ° C in the stretching step. The method of claim 1, wherein the second heat treatment unit is heat-treated at 120 to 170 ° C.