Direct spinning method for single-part four-end 2200dtex high-modulus low-shrinkage polyester industrial yarns

A high-modulus, low-shrinkage technology, applied in the field of spinning, can solve the problems of affecting single parts, low production efficiency, maximization of production capacity and reduction of production costs, and achieve the effect of reducing production costs and improving production capacity.

Active Publication Date: 2012-07-04
WUXI TAIJI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the production of high-modulus low-shrinkage polyester industrial yarn is mostly one-step spinning with 3 heads / position and 4 heads / position, which can only be used to produce polyester yarns of 1100dtex~1670dtex, of which 2200dtex high-modulus low-shrinkage polyester Industrial yarn is generally realized by joint stock method, and the production efficiency is not high, which seriously affects the maximization of production capacity of a single part and the reduction of production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: A method for direct spinning of a single-position four-head 2200dtex high-modulus low-shrinkage polyester industrial yarn, comprising the following process steps:

[0015] (1) Processing of high-viscosity polyester chips: The polyester chip raw materials with a viscosity of 0.68dl / g are sieved and put into a high-speed rotating Sulida crystallizer for pre-crystallization. The pre-crystallizer is heated with heat-conducting oil, and the pre-crystallization temperature is 180°C , the pre-crystallization time is 12min; then carry out solid-state polymerization to obtain high-viscosity polyester chips, the temperature of solid-state polycondensation is 215°C, and the time is 24h; the viscosity of high-viscosity polyester chips is 1.05dl / g, and the terminal carboxyl group is less than 15mol / t;

[0016] (2) Melt spinning: the high-viscosity polyester chips after solid-state polymerization enter the screw extruder through the screw silo under the protection of nit...

Embodiment 2

[0019] Embodiment 2: A direct spinning method of a single-position four-head 2200dtex high-modulus low-shrinkage polyester industrial yarn, comprising the following process steps:

[0020] (1) Processing of high-viscosity polyester chips: The polyester chip raw materials with a viscosity of 0.68dl / g are sieved and entered into a high-speed rotating Sulida crystallizer for pre-crystallization. The pre-crystallizer is heated with heat transfer oil, and the pre-crystallization temperature is 185°C , the pre-crystallization time is 8min; then carry out solid-state polymerization to obtain high-viscosity polyester chips, the temperature of solid-state polycondensation is 230°C, and the time is 20h; the viscosity of high-viscosity polyester chips is 1.15dl / g, and the terminal carboxyl group is less than 15mol / t;

[0021] (2) Melt spinning: the high-viscosity polyester chips after solid-state polymerization enter the screw extruder through the screw silo under the protection of nitrog...

Embodiment 3

[0024] Embodiment 3: A kind of direct spinning method of single position four ends 2200dtex high modulus low shrinkage polyester industrial yarn, comprising the following process steps:

[0025] (1) Processing of high-viscosity polyester chips: The polyester chip raw materials with a viscosity of 0.68dl / g are sieved and put into a high-speed rotating Sulida crystallizer for pre-crystallization. The pre-crystallizer is heated with heat-conducting oil, and the pre-crystallization temperature is 180°C , the pre-crystallization time is 10min; then carry out solid-state polymerization to obtain high-viscosity polyester chips, the temperature of solid-state polycondensation is 220°C, and the time is 23h; the viscosity of high-viscosity polyester chips is 1.1dl / g, and the terminal carboxyl group is less than 15mol / t;

[0026] (2) Melt spinning: the high-viscosity polyester chips after solid-state polymerization enter the screw extruder through the screw silo under the protection of nitr...

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Abstract

The invention relates to a direct spinning method for single-part four-end 2200dtex high-modulus low-shrinkage polyester industrial yarns, which comprises the following process steps of: pre-crystallizing raw materials, such as polyester slices, and obtaining polyester slices by solid phase polymerization; heating the polyester slices in a screw extruder to obtain polyester melts, distributing the polyester melts to melt branch pipes through a main melt pipe, then metering via a metering pump, feeding the melts to a spinning assembly and extruding the melts from a spinneret to form tows, and subjecting the tows to cooling shaping in a circular blowing device; oiling the surface of the tows, drawing, shaping and relaxing the tows by using six pairs of rollers, forming first-stage drawing between the first pair of rollers and the second pair of rollers, forming second-stage drawing between the second pair of rollers and the third pair of rollers, performing constant velocity shaping between the third pairs of rollers and the fourth pair of rollers as well as between the fourth pair of rollers and the fifth pair of rollers, and forming retraction shaping between the fifth pair of rollers and the sixth pair of rollers; and coiling to obtain the polyester industrial yarns. The polyester yarns produced according to the method disclosed by the invention have high breaking strength, effectively-improved the yield of single part and lowered production cost.

Description

technical field [0001] The invention relates to a spinning method, in particular to a single-position four-head 2200dtex high-modulus low-shrinkage polyester industrial yarn direct spinning method, which belongs to the field of polyester industrial yarn manufacturing. Background technique [0002] At present, the production of high-modulus low-shrinkage polyester industrial yarn is mostly one-step spinning with 3 heads / position and 4 heads / position, which can only be used to produce polyester yarns of 1100dtex~1670dtex, of which 2200dtex high-modulus low-shrinkage polyester Industrial yarn is generally realized by joint stock, which has low production efficiency and seriously affects the maximum production capacity of a single part and the reduction of production costs. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a direct spinning method of single-position four-head 2200dtex high modul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/084D01D5/088D01D5/096D01D5/16D01D1/00D01D1/04
Inventor 许其军姚峻季永忠
Owner WUXI TAIJI IND
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