KR0120016B1 - Method for manufacturing polyester super fine multi-filament - Google Patents

Abstract

A polyester chip containing original viscosity 0.63-0.660, having ethyleneterephthalate as a main unit is dried under 50[PPM while manufacturing and melted spun at 290 degree C. For a spinneret(1) used for this dry, the condition is provided that L/D under 2.5-4.0 is used, the venting amount from the melted polymer is 0.1-0.4g/min hole, and the spinning temperature is 290-310 degree C.

Description

Manufacturing method of polyester ultra fine multifilament

1 is a radiation installation used in the present invention.

2 is a conventional rectification plate.

3 is a rectifying plate used in the present invention.

* Explanation of symbols for main parts of the drawings

1: detention 2: heater

3: heat insulation zone 4: first chimney

5: second chimney 6: rectifying plate

7: Oil guide 8,10: Separation R / O

9,11: Gauge R / O 12: Winder

The present invention relates to a method for producing a polyester ultrafine multifilament having a single yarn fineness of 0.2-0.6 denier level by a high-speed spinning method.

In recent years, multifilaments of less than 0.5 denier have been used in new synthetic fabrics that emphasize the effect of micropowder touch or silk like of artificial leather or textiles as the basis of high value-added products. have.

As a method for producing a multifilament of 0.5 denier or less, dissolving and removing sea component of island-in-the-sea composite fiber, splitting method of spliced composite fiber, manufacturing method of microfiber by ordinary spinning and stretching method, spinning, winding at 2500 m / min or more High-speed spinning;

Related patents for the island-in-the-sea composite spinning method and the conjugated spinning method include Japanese Patent Application Publication Nos. 48-25362 and 51-130317. However, special spinning equipment is required for spinning two kinds of polymers. As a result, there is a problem in that uniformity of quality is insufficient and manufacturing cost of the product is increased.

In addition, there are related patents such as Japanese Patent Application Publication No. 55-26201 as a manufacturing method of microfibers by ordinary spinning and stretching method, but there is an advantage that existing spinning equipment can be used, but the spinning speed is low and the temperature and atmosphere Normal radiation is not possible due to uneven temperature, and the discharge amount is small, so there is a big fluctuation in fineness.

In addition, there are related patents such as Japanese Patent Application Laid-Open Publication Nos. 54-30924, 54-64119, 54-90609, 60-24683, 61-186515 as a method of producing ultrafine multifilament by a high-speed spinning method of 2500 m / min or more. But. The manufacturing method of the ultra-fine multifilament by the high-speed spinning method has a high spinning speed, the radiation tension of the emitter is high, the spinning stability is poor due to the flow of the yarn, there is a problem to adjust the cooling rate. Therefore, when the ultra-fine multifilament of 0.5 denier or less is manufactured by the above method, the trimming rate in spinning is high compared to the radiation stability and the operability of general yarns, and the workability of the post process is high due to many yarn defects such as wool and single yarn. And dyeability.

The present invention has been made in order to solve the above problems, the high-speed spinning method to spin through a 100-200 holes (detention), in which the discharge amount of the polymer is small to maintain a uniform temperature on the surface of the detention occurs Heater is installed in the lower part of the cap, changing the length of the hot-tone in the lower part of the cap to control the solidification rate of the emitter, and installing a rectifying plate to minimize the flow of yarn by cooling wind and external airflow. It is characterized by.

The rectifying plate used in the present invention is illustrated in FIG. 3 as a supplement to the problem of the rectifying plate of Japanese Patent Publication No. 55-5183.

In case of the conventional rectifying plate as shown in FIG. 2, there is a problem that must be used at various times and a problem of generating yarn flow due to the vortex of air in the outer shell of the rectifying plate. The above problems were solved by further drilling holes having a diameter of 1-5 mm.

Referring to the present invention in detail based on the accompanying drawings as follows.

In the present invention, the polyester chip (CHIP) having an intrinsic viscosity of 0.63-0.660 with ethylene terephthalate as the main unit is dried at 50PPM or less, and then melted at 290 ° C to the equipment shown in FIG. 1 in the range of 2500-5000m / min. In this case, the spinneret (1) used uses a L / D having a hole level of 2.5-4.0. In this case, when the L / D is less than 2.5, discharge pressure occurs due to the low pressure of the molten polymer acting on the back surface of the mold, and when it exceeds 4.0, the precision of processing decreases and the manufacturing cost of the mold by precision processing There is a problem in cleaning the detention.

The discharge amount of the molten polymer is radiated to a hole level of 0.1-0.4 g / min. If the discharge amount is less than 0.1 g / min hole, the temperature of the detention is less because the amount of heat supplied by the molten polymer to the detention is less than the heat release amount of the detention. Deterioration is poor, the radiation stability is poor, and even the slight fluctuation of the cooling wind, the flow of the yarn is increased, the sand is generated, if there is more than 0.4g / min hole there is a problem in the uniform cooling of the yarn.

In addition, the spinning temperature is set at 290-31O ℃, the heater (2) temperature is set at a temperature 1-1.3 times higher than the spinning temperature, when the spinning temperature is less than 290 ℃ spinning in the detention hole of the molten polymer is poor If the stability is lowered, when it exceeds 310 ℃ there is a problem that white powder is generated at the bottom of the single cutting and detention when spinning due to deterioration of the polymer.

On the other hand, the length of the thermal insulation zone (3) is adjusted to 30-60mm in order to shorten the freezing point of the discharger, when the thermal insulation zone is less than 30mm, the heat loss due to the cooling wind is large, and if the thermal insulation zone exceeds 60mm by slow cooling of the discharger Even slight changes in tension cause quarters. In addition, the discharged yarn is solidified and cooled by the first chimney (4) and the second chimney (5), when using only the second chimney in the cooling method of the yarn, the uniform cooling of the central portion and external of the multifilament is poor, In order to improve this, when the wind speed is increased, the radial tension is increased by the contact area of the multifilament, thereby increasing the flow of yarn, which causes defects such as single yarn break and loop. The wind speed of the cooling wind is 10-25m / min for the second chimney and 2.5-2.0m / min for the first chimney. The cooling of the yarn is poor when the wind speed of the second chimney is less than 10m / m, and exceeds 25m / min. If so, there is a problem that the radiation tension rises.

In order to adjust the radial tension, the oil guide 7 is installed at a distance of 600-1200 mm from the lower part of the cap and the rectifying plate 6 is mounted at a 400-600 mm position from the lower part of the cap to minimize the influence of the cooling layer and air flow. Positioning of the rectifying plate is preferably provided between the focusing position of the yarn after the solidification point of the yarn, more preferably 10mm above the first chimney.

In addition, the radiation tension is 0.1-0.3g / de level, when the radial tension exceeds 0.3g / de is applied to the discharge yarn is excessive force flow of the yarn, which causes a problem that the cross-sectional fluctuation of the yarn is increased, 0.1 If less than g / de there is a problem that the runability of the Laura due to the lowering of the radial tension is poor and the occurrence of single truncation.

The solidified cooled filament is stretched in the range 1.0-2.0, and wound up in the winder 12 at a speed not higher than 5000 m / min, wherein the stretching temperature is 85-100 ° C., and heat-treated in the range 120-140 ° C., The ultrafine multifilament having a strength of 0.3 g / de or more and an elongation of 50% or less with a single yarn fineness of 0.2-0.6 denier is produced.

Hereinafter, the present invention will be described in more detail with reference to the following examples.

Example 1

The polyester chip having an intrinsic viscosity of 0.65 or less was dried at 50 PPM or lower, and then melted at 290 ° C. to spin at a rate of 2500 m / min through the detention of L / D 3, and the wind speed of the second chimney was 25 m / min and the first The wind speed of chimney was set to 10 m / min to solidify the yarn, stretched to 1.52 times, and wound to prepare 75 denier and 144 filaments. At this time, the temperature of the heater in the lower part of the cap was set at 300 ° C, a rectifier tube having a hole diameter of 80 mm at the center was installed at 500 mm directly under the cap, and the oil guide was attached to 1000 mm directly under the cap.

Physical properties and workability of the prepared filaments are shown in Table 1.

Example 2

The filament was prepared in the same manner as in Example 1 except that the spinning speed was changed to 3000 m / min and drawn 1.6 times, and the physical properties and workability are shown in Table 1.

Example 3

The filament was prepared in the same manner as in Example 1 except that the spinning speed was changed to 3500 m / min and stretched 1.2 times, and the physical properties and workability are shown in Table 1.

Example 4

After spinning at 3800m / min, the second chimney's wind speed is 20m / min and the first chimney's wind speed is 10m / min, which solidifies the yarn and stretches it after 1.2 times stretching. The filaments were manufactured in the same manner as in Example 1 except that the filaments were attached to 500 mm and 800 mm, and the physical properties and workability of the manufactured filaments were given in Table 1.

Example 5

It was prepared in the same manner as in Example 4 except that the filament was prepared by changing the temperature of the lower heater to 360 ° C., and the physical properties and workability are shown in Table 1.

Comparative Example 1

Except for the rectifying plate to prepare a filament was prepared in the same manner as in Example 4, the physical properties and workability are shown in Table 1.

Comparative Example 2

The filament was prepared in the same manner as in Example 4 except that the spinning speed was changed to 5200 m / min and drawn 1.2 times, and the physical properties and workability are shown in Table 1.

3. Evaluation of Physical Properties

1) Fineness: Measured according to JIS-L1013 method.

2) Strength and elongation: Measured by Shimadtsu Autograph based on JIS-L1013 method.

3) Cross-sectional ward rate: (cross-sectional area deviation of yarn / average cross-sectional area of yarn) x100

Claims (6)

In the production of ultrafine multifilaments by the high-speed spinning method, a polyester having an intrinsic viscosity of 0.63-0.660 is melted at a spinning temperature of 290-310 ° C to be spun and wound at a speed of 2500-5000 m / min, and the first and the second 1 chimney 2.5-20 m / min using 2 chimneys. The second chimney cools at a wind speed in the range of 10-20 m / min, and stretches 1.0-2.0 times with a drawing temperature of 85-100 ° C., followed by heat treatment at 120-140'c. Method for preparing ester microfilament. The method of claim 1, wherein the lower heater's heater temperature during melting is controlled to be 1-1.3 times higher than the spinning temperature. The method of claim 1, wherein the discharge amount of the molten polymer is emitted to the level of 0.1-0.4g / min hole. In the ultra-fine multifilament manufacturing apparatus by the high-speed spinning method, oil guides are installed at a distance of 600-1200 mm from the lower part of the cap to control the radial tension during spinning, and around the hole diameter in the center to minimize the influence of cooling wind and air flow. An apparatus for producing a polyester ultra-fine multifilament, characterized in that a rectifying plate having a hole with a diameter of 1-5 mm is additionally drilled at a position of 400-600 mm from a lower part of a cap. 5. The apparatus of claim 4, wherein the radial tension is adjusted in the range of 0.1-0.3 g / de. 5. The apparatus of claim 4, wherein the spinneret uses a L / D having a hole level of 2.5-4.0. 6.