KR940006374B1 - Method of preparing polyecter fiber having defferent shrinkage yarn - Google Patents

Abstract

making the high shrinkage yarn and the low shrinkage yarn, using the apparatus, in which difference of the lengths (W,W*) between the heat-retention part of the high shrinkage yarn preparing unit and that of the low shrinkage yarn preparing unit is 140-200 mm, and the difference of the distance (O,O') between the surface of the spinneret and the oiling roller is 200-1,200 mm; doubling the two yarns; drawing the doubled yarn between the first godet roller and the second godet roller; and winding.

Description

Manufacturing method of polyester biaxial blended yarn

The accompanying drawings are process schematic diagrams of the present invention.

* Explanation of symbols for main parts of the drawings

One ; Spinneret 2, 2 ': Heat insulation board

3: cooling air supply device 4: inter floor tube

5: Emulsion supply roller 6: 1st Godet roller

7: first separator roller

8: 2nd high roller 9: 2nd separate roller

10: guide for granting the bridge 11: winding winder

W: Length of thermal insulation part of thread A 'W: Length of thermal insulation part of thread B

C: Length of cooling part of thread A 'C': Length of cooling part of thread B

O: Distance from the detention surface of company A to tanning roller

O ': Distance from the detention surface of company B to emulsion roller

The present invention relates to a method for producing a polyester biaxially blended yarn which can obtain a biaxially blending effect of the final twisted yarn by only partially remodeling the take-out facility while using the existing spinning equipment as it is without a separate process.

Conventionally, a method for producing a biaxially blended blended yarn is a method of using a heterogeneous polymer, a method of blending after stretching and heat-setting conditions are different. ③ It is known to manufacture undrawn yarn (UDY) and partially drawn oriented yarn (POY), and then to ply them together. However, in the ① method, after spinning using a separate polymer, There are problems of cost increase such as separate polymerization process by using two kinds of polymers as a method of manufacturing biaxially blended blend yarns. In the method of ②, each yarn is drawn using different rollers with different stretching and heat treatment conditions. There is a problem in the equipment that there must be a stretching roller for different drawing conditions by the method of drawing by drawing under the conditions, and ③ method of manufacturing UDY and POY separately and then ply together to produce this shrinkage blending yarn. There is a problem that requires two processes, a process of making UDY and a process of making POY.

Therefore, in the present invention, no shrinkage is required by a simple structure change such as dual length of heat insulating part, dual structure of air quenching, and dual structure of radial quenching in a conventional spin draw yarn (SDY) manufacturing process without a separate process. The purpose is to provide a method for producing the.

A conventional polyester SDY manufacturing process is shown in the drawing, after spinning the polyester polymer, the four sides of the insulating heat insulating plates (2, 2 ') and then cooled in a cooling apparatus interflooer tube (4) The polyester SDY is produced as the yarn is connected as the oil is fed through) and then stretched in the Goett Rollers 6 and 8.

In the conventional SDY manufacturing process, in the present invention, the length (W) of the thermal insulation portion of thread A is shorter than the length (W ') of the thermal insulation portion of thread B, and the length (C) of the cooling portion of thread A is the length of the cooling portion of thread B. It is longer than (C '), and the distance (O) from the surface of the thread A to the fluid roller is shorter than the distance (O') from the surface of the thread B to the emulsion roller. The high shrinkage yarn is made, and the B yarn is made of a low shrinkage yarn with higher crystallinity than the A yarn, and then the A yarn and the B yarn are combined and drawn in the same manner as in the conventional SDY to produce a biaxial blended yarn.

If the length of the thermal insulation section is less than that of the production of thread B, or the length of the cooling zone is not longer than that of the production of thread B, or the emulsification position is not shorter than that of the production of thread B, the degree of crystallinity of thread A and B is not different. Therefore, it is not possible to manufacture effective shrink shrink blended yarn.

At this time, the difference between the length of the thermal insulation part at the time of manufacturing thread A and the length of the thermal insulation part at the time of manufacturing thread B is 140 to 200 mm, and the difference in the length of the cooling part at the time of manufacturing thread A and the cooling part at the time of manufacturing thread B is actually A thread. The length of the insulation part + the length of the cooling part should be the same as the length of thread B thread production during manufacture, and it is 140 ~ 200mm. It should be 200 ~ 1,200mm.

If the difference between the length of the insulation part and the length of the cooling part, and the difference between the length of the cooling part and the difference between the lengths of the A and B productions are less than 140 mm, the effect of shrinkage is insignificant. The length becomes so long that the uniformity (U%) of yarn is poor.

In addition, if the gap difference between surface surface and emulsion roller is less than 200mm, there is almost no difference in the radial tension between manufacturing A thread and B thread, and the shrinkage effect is weak.If the gap exceeds 1,200mm, the shrinkage effect is better than 1,200mm. Since it is not greatly increased and there is a problem in equipment, the present invention is limited to 1,200 mm.

When yarn A is manufactured in this way, high shrinkage yarns with low crystallinity are produced due to the short insulation length and low radial tension.By yarn B is a low shrinkage yarn with high crystallinity with relatively long insulation length and high radial tension compared to yarn A. Are manufactured.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples.

However, the present invention is not actually limited.

Example 1

Using polyethylene terephthalate having an intrinsic viscosity of 0.675, the length of the insulation part, the length of the cooling part, and the distance between the surface of the detention roller and the emulsion roller are manufactured using the device as shown in <Table 1>. The speed and temperature of one gourd roller were made 3,400 m / sec and 100 degreeC, and the speed and temperature of the 2nd gourd roller were made 5,300 m / sec and 115 degreeC, and it wound up.

At this time, the wound A thread and thread B thread are separated and their respective physical properties are shown in Table 1.

Example 2-3 and Comparative Example 1-3

It carried out by the same method as Example 1, but performed the length of a heat insulation part, the length of a cooling part, and the distance between a surface of a prisoner and an emulsion roller as shown in <Table 1>.

TABLE 1

※ How to measure non-shrinkage rate

Original sample length = a

Length = b after treatment for 30 minutes in water at 100 ° C

Claims (1)

In the production of polyester biaxially blended yarns, the difference between the lengths of the heat retaining sections (W, W *) of the high shrink yarn manufacturing section and the low shrinkage yarn manufacturing section is 140 to 200 mm, and the distance (O, O ') from the surface of the mold to the emulsion roller. Polyester high shrink yarn and low shrink yarn are manufactured using a device having a difference of 200-1,200 mm, and then pulled together and stretched between the first high roller and the second high roller, followed by winding. Manufacturing method.