KR950002804B1 - Process for manufacturing polyester fiber - Google Patents

Abstract

spinning polyester yarn at a below 5000 m/min spinning speed; cooling in cooling bath of 400-500 mm length; heat-treating a heat pipe of 200-300≰C; passing ever the first godet roller; and heat-stabilizing in the second godet roller at the same speed as the of 1st godet roll at 100-200≰C. The process, the production reduces cost.

Description

Method for producing polyester fiber

1 is a process schematic diagram of the present invention.

The present invention relates to a method for producing a polyester fiber that can obtain excellent properties of the drawn yarn even when not drawn separately in the production of polyester fibers at a spinning speed of 5000 m / min or less.

The conventional method for producing polyester fibers at a spinning speed of 5000 m / min or less has been made in the process sequence of spinning → cooling → stretching → winding between the first high speed roller and the second high speed roller.

In this method, the yarn property suitable for clothing can be obtained only by stretching between the first roller and the second roller.

If it is not stretched, it may cause problems such as increase of elongation, U% (evenness) defect, increase of property deviation, and occurrence of plaque due to non-uniformity of crystallization and orientation.

Therefore, the stretching is an indispensable condition, and in order to facilitate such stretching, the temperature difference between the first gourd roller and the second gourd roller should be kept above the Tg temperature of the polyester by the speed difference between the first gourd roller and the second gourd roller.

Therefore, the conventional method has a problem that the installation area is increased due to the stretching between the first high roller and the second high roller, and the productivity cannot be rationalized.

The present invention can reduce the installation area without obtaining a separate stretch when producing polyester fibers at a spinning speed of 5000m / min or less, obtain excellent stretched yarn properties, can achieve energy saving and rationalization of productivity It is an object of the present invention to provide a manufacturing method, which will be described in detail by way of example drawings.

The present invention relates to a conventional method for producing polyester fibers at a spinning speed of 5000 m / min HIA, wherein the polyester polymer is melt spun and cooled in a cooling chamber of 400 to 500 mm in length (temperature 17 ° C., 0.45 m per second wind speed). After the oiling, heat treatment is performed in a heat pipe having a temperature of 200 to 300 ° C., followed by passing the first high roller in a room temperature, and then heat-setting the second high roller in the same speed as the first high roller. (See Figure 1.)

In the present invention, the cooling chamber is shortened and quenched, and then passed through a heat pipe to produce crystallization at a constant rate. Physical properties of the polyester drawn yarn were expressed.

In the present invention, the length of the cooling chamber is shorter than 760 to 1000 mm, which is the length of a normal cooling chamber, to 400 to 500 mm. The reason for the cooling chamber is that the cooling chamber is shortened and the solidification is prevented. 3,300 to 4,800 m / min) to achieve a uniform orientation.

If the length of the cooling chamber is less than 400mm, the solidification occurs in the lower portion of the detention, causing a lot of cutting occurs. If it exceeds 500mm, the solidification is too much, the stretching is not uniform.

In the present invention, the reason for using the first high-pressure roller at room temperature without using the first high-pressure roller as the conventional one and using a heat pipe is that the high temperature of the first high-pressure roller causes the heat treatment to be uneven due to the instantaneous heat treatment. This is because it becomes uneven, and heat treatment can be made uniform by the heat pipe, and stabilization of heat treatment can be achieved by the first high heat roller at room temperature.

In the present invention, the tanning treatment is preferably an oil spraying device instead of an oil ring roller, and is preferably two stages. In the present invention, better results can be obtained by setting the interval between the upper and lower oil injectors to 30 to 50 mm.

Example 1

After spinning a polyethylene terephthalate polymer with an intrinsic viscosity of 0.65 at a spinning speed of 3800 m / min and cooling it in a cooling chamber of 400 mm in length, impart an emulsion in two stages by oil spraying and heat treatment in a heat pipe with a temperature of 280 ° C. The physical properties of the wound yarn after heat-setting in the first gourd roller and the second gourd roller at 120 ° C. at the same temperature at 3800 m / min were measured and shown in Table 1.

Examples 2-3 and Comparative Examples 1-3

Manufactured in the same manner as in Example 1, but was changed by changing the spinning speed, the length of the cooling chamber, the heat pipe temperature, the temperature of the second gourd roller as shown in Table 1.

Comparative Example 4

A polyethylene terephthalate polymer with an intrinsic viscosity of 0.65 was spun at a spinning speed of 1350 m / min, cooled in a cooling chamber of 800 mm in length, then oiled, a first gourd roller with a speed of 1350 m / min, and a temperature of 89 ° C. After stretching in a second roller roller having a min and a temperature of 120 ° C., it was wound up.

The results are shown in Table 1.

TABLE 1

* The intensity deviation is measured 20 times of the sample and the deviation is

If less than 0.10: ○

If 0,10 to 0.15: △

0.15 or more

Claims (1)

In producing polyester yarn at a spinning speed of 5000 m / min or less, it is cooled in a cooling chamber having a length of 400 to 500 mm, heat treated in a heat pipe having a temperature of 200 to 300 ° C., and then passed through a first gourd roller at room temperature. A process for producing polyester yarns characterized by heat setting in a second high speed roller at 100-200 ° C. at the same speed as the first high speed roller.