Manufacturing method for low-shrinkage high-strength PET industrial yarn

A high-strength polyester and manufacturing method technology, applied in the field of polyester industrial yarn manufacturing, to achieve the effects of reducing cooling rate, low linear density deviation rate, and avoiding local concentration

Active Publication Date: 2014-08-20
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing research shows that the cooling process is not ideal in the production process of the current low-shrinkage high-strength polyester industrial yarn
Chinese patent CN101824664A describes a method for manufacturing high-strength polyester yarn, which adopts ring blowing cooling, and the linear density unevenness of the obtained polyester industrial yarn is relatively high
But the control of cooling rate and temperature is not discussed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The high-viscosity molten polyester raw material refers to PET high-viscosity slices with an intrinsic viscosity of 1.0dl / g;

[0037] The cooling includes four parts of slow cooling, pre-cooling, cooling in the windless zone and blowing cooling in turn;

[0038] The slow cooling refers to that the ambient temperature of the tow is 260°C, the temperature of the tow at the exit of the slow cooling zone is 280°C, and the slow cooling height is 250mm.

[0039] The pre-cooling refers to that the ambient temperature of the tow is 160° C., and the temperature of the tow at the outlet of the pre-cooling zone is 250° C.; the pre-cooling height is 60 mm.

[0040] The cooling in the windless zone means that the ambient temperature of the tow is 120° C., and the temperature of the tow at the exit of the windless zone is 230° C.; the cooling height in the windless zone is 200 mm.

[0041] The wind temperature of the blowing cooling is 15°C; the blowing cooling is side blowing cooli...

Embodiment 2

[0046] The high-viscosity molten polyester raw material refers to high-viscosity slices with an intrinsic viscosity of 1.2dl / g.

[0047] The cooling includes four parts of slow cooling, pre-cooling, cooling in the windless zone and blowing cooling in turn;

[0048] The slow cooling refers to that the ambient temperature of the tow is 300°C, the temperature of the tow at the exit of the slow cooling zone is 285°C, and the slow cooling height is 300mm.

[0049] The pre-cooling refers to that the ambient temperature of the tow is 260° C., and the temperature of the tow at the outlet of the pre-cooling zone is 260° C.; the pre-cooling height is 80 mm. The pre-cooling is active outer ring sequential pre-cooling; the active outer ring sequential pre-cooling refers to sending hot air through the active outer ring sequential device to cool the filaments; the active outer ring The ring sequence device is a hollowed-out sequential annular belt, and the circumferential direction of the ...

Embodiment 3

[0056] The high-viscosity molten polyester raw material refers to high-viscosity slices with an intrinsic viscosity of 1.1 dl / g.

[0057] The cooling includes four parts of slow cooling, pre-cooling, cooling in the windless zone and blowing cooling in turn;

[0058] The slow cooling refers to that the ambient temperature of the tow is 270° C., the temperature of the tow at the exit of the slow cooling zone is 281° C.; the height of the slow cooling is 260 mm.

[0059] The pre-cooling refers to that the ambient temperature of the tow is 170° C., and the temperature of the tow at the outlet of the pre-cooling zone is 252° C.; the pre-cooling height is 65 mm. The pre-cooling is active outer ring sequential pre-cooling; the active outer ring sequential pre-cooling refers to sending hot air through the active outer ring sequential device to cool the filaments; the active outer ring The ring sequence device is a hollowed-out sequential annular belt, and the circumferential directio...

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Abstract

The invention relates to a manufacturing method of low-shrinkage and high-strength polyester industrial yarn. The process flow is high-viscosity molten polyester raw material—measurement—spraying—cooling—oiling—stretching—heat setting—winding; the polyester slices used are It is a high-viscosity chip obtained by solid-phase viscosification. The cooling process includes four parts: slow cooling, pre-cooling, windless zone cooling and blowing cooling. The pre-cooling adopts the method of active outer ring sequential pre-cooling. The hot air is conveyed through the active outer ring sequencer to cool the filaments. Through the introduction of the pre-cooling device, not only the disturbance of the tow caused by the downward movement of the fiber solidification point is reduced, the deviation rate of the linear density of the tow is controlled, but also the orientation and crystallization of the primary fibers are reduced, and the deviation rate of the linear density is ≤ 1.5%, breaking strength > 7.5cN / dtex, polyester industrial yarn with dry heat shrinkage rate of 1.8±0.5%.

Description

technical field [0001] The invention relates to a production method of polyester industrial yarn, in particular to a production method of low-shrinkage high-strength polyester industrial yarn, and belongs to the field of polyester industrial yarn manufacturing. Background technique [0002] Polyester is the most important variety of chemical fibers. It has excellent performance and is widely used. It not only occupies an important position in clothing materials, but also shows strong vitality in industrial supplies. Polyester industrial yarn is widely used in tire cords, safety belts, airbags, conveyor belts, and high-pressure resin reinforcement materials due to its high strength, large modulus, small elongation, heat resistance, impact resistance, and good fatigue resistance. . [0003] According to its performance, polyester industrial yarn can be divided into high strength and low elongation type (ordinary standard type), high modulus and low shrinkage type, low shrink...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/088
Inventor 汤方明李文刚王丽丽王山水尹立新杨大矛孙晓华
Owner JIANGSU HENGLI CHEM FIBER
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