KR100490193B1 - Preparation of draw textured polyester yarn producted by undrawn filaments - Google Patents

Abstract

The present invention relates to a method for producing a polyester twisted yarn using polyester undrawn yarn, the present twisted yarn is a method for producing a polyester twisted yarn by cold stretching the polyester undrawn yarn at a low temperature at room temperature, the twist is uniform There is an advantage that can be produced polyester twisted yarn excellent in crimp fastness and elasticity.

Description

 Preparation method of polyester twisted yarn using polyester unstretched yarn {Preparation of draw textured polyester yarn producted by undrawn filaments}

The present invention relates to a method for producing polyester twisted yarn, and more particularly, to a method for manufacturing polyester twisted yarn having excellent crimp fastness and stretchability using polyester unstretched yarn.

In general, polyester twisted yarn is produced by high-speed thermal stretching at a draw speed of 500 to 900 m / min at a high temperature of 150 to 210 ℃. Polyester twisted yarns produced by this method have uniform twist and excellent crimp fastness, but have the disadvantage of lowering the elastic modulus of elasticity. Especially, in the twisted yarn having high twisting coefficient of 1600T / M, the elastic modulus of elasticity is close to 25%. It has the disadvantage that it falls and is low in elasticity.

 Accordingly, the present invention is to provide a polyester twisted yarn having excellent elasticity in view of the above problems of the prior art as a technical problem.

In order to solve the above problems, the present inventors have increased the crystallinity and orientation when the unstretched yarn is subjected to high temperature heat under tension to increase the cutting strength and the initial modulus but the elongation modulus decreases. However, when the low-temperature cold drawn at room temperature without the heat treatment is lowered, the orientation degree increases, but the crystallinity is lowered, the elongation modulus is increased, and the obtained false twisted yarn is excellent in elasticity in case of burning in this state. The present invention has been completed.

Therefore, according to the present invention, in the polyester twisted yarn, the polyester twisted yarn is stretched, twisted and wound to produce a polyester twisted yarn, the stretching speed of 150 ~ 200m / min at 20 ~ 50 ℃ Provided is a method for producing polyester twisted yarn using polyester unstretched yarn, which is characterized in that it is stretched by.

Hereinafter, the present invention will be described in more detail.

As a polyester which becomes the raw material of the false twisted yarn of this invention, polyethylene terephthalate (PET) or polytrimethylene terephthalate (PTT) is preferable.

This method is characterized by the low-temperature cold-drawn polyester undrawn yarn at room temperature. Preferable extending | stretching conditions are the temperature of 20-50 degreeC, and the extending | stretching speed | rate 150-200 m / min. If the drawing temperature is too high in the general drawing process of polyester non-drawn yarn, the neck, which is a local extension part of the polyester undrawn yarn, is lost and becomes uniform, but in extreme cases, it shows super-drawing behavior so that the orientation is not increased. do. In addition, when the stretching temperature is too low, the impact break occurs and continuous stretching is impossible.

In the present invention, however, the unstretched polyester is stretched at a low temperature of 20 to 50 ° C., but the stretching speed is stretched at a slow speed of about 150 to 200 m / min to enable continuous stretching. When the film is drawn at the temperature of 20 to 50 ° C., the degree of crystallinity is lowered, thereby increasing the amorphous region inside the filament. When the film is drawn at the drawing speed of 150 to 200 m / min, continuous drawing can be performed by preventing impact fracture. At the same time the degree of orientation can be increased. The polyester twisted yarn of the present invention has excellent elongation modulus and crimp fastness even by a weak twisting process of about 100T / M, and the existing high-speed hot-stretched twisted yarn has a stretch elastic modulus of about 25% when burned at a high twist of 1600T / M. However, the low-temperature cold-twisted twisted yarn according to the present invention maintains an excellent elastic modulus of 40% even at a high twist rate of 1600T / M, resulting in high elasticity.

As described above, the low temperature cold drawn filament can be twisted and wound by a flammable apparatus to produce polyester twisted yarn.

In the following examples, the non-stretched polyester unstretched yarn is cold-stretched at room temperature, followed by flamming and winding to produce a polyester twisted yarn.

Example 1

The non-drawn polyethylene terephthalate (PET) of 120 denier / 36 filament was drawn at a draw speed of 150m / min using a drawwinder at 20 ° C, and a false twist was applied at a twist rate of 100T / M. Polyester false twisted yarn was obtained.

Physical properties of the polyester twisted yarn prepared above were measured and evaluated in the following manner.

* Crimp fastness: As the item showing the crimp fastness of polyester false twisted yarn, it was measured by the herberlein method (herberlein).

* Shrinkage: As an item showing the bulkiness of polyester false twisted yarn

It was measured by the dry method (180 ° C., 3 minutes) and the wet method (100 ° C., 10 minutes). (KS K 612)

* Elastic modulus of elasticity: measured by the herberlein method, the higher the value, the better the elasticity of the combustible yarn.

[Example 2 and Comparative Examples 1,2]

The same procedure as in Example 1 was repeated except that the fineness and number of polyethylene terephthalate (PET) unstretched yarns, the stretching temperature, the stretching speed, and the number of twists were changed as shown in Table 1.

Filament Fineness (d) Filament number Drawing temperature Drawing speed (m / min) Twist (T / M) Example 1   120   36 20 ℃ 150 100 Example 2   120   36 20 ℃ 150 1600 Comparative Example 1   120   36 190 ℃ 800 100 Comparative Example 2   120   36 210 ℃ 800 1600

Physical properties of the polyester twisted yarn obtained in the above Examples and Comparative Examples are shown in Table 2.

Cutting strength Crimp Fastness Shrinkage Elongation Modulus deflation Wet Example 1 3.45 60% 19 18 50% Example 2 3.57 0 14 12 40% Comparative Example 1 3.5 55% 14 14 50% Comparative Example 2 3.7 0 8 7 25%

As described above, according to the present invention, the polyester unstretched yarn can be cold-stretched and burned at low speed to produce a uniform twist with excellent crimp fastness, and a high-strength stretchable twisted yarn. In the case of burning water with a flammability coefficient of 1600T / M, the elongation modulus decreases to 25%, while the low-stretch cold-burned yarn according to the present invention can maintain excellent elongation modulus (40%) even at a high twist of 1600T / M. In addition, since it is stretched at a low speed, continuous stretching is possible at a low temperature, and thus has the advantage of performing a stable process.

Claims (1)

In the method of manufacturing polyester false twist yarn, A method for producing polyester twisted yarn using polyester undrawn yarn, wherein the polyester undrawn yarn is stretched and burned at a draw speed of 150 to 200 m / min at 20 to 50 ° C.