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Preparation technology of ultralow contraction terylene industry long filament

A preparation process, ultra-low shrinkage technology, applied in the field of textile technology, can solve problems such as unreachable, short heating time of tow, insufficient crystal growth, etc., to achieve the effect of ensuring purity and viscosity uniformity

Active Publication Date: 2007-01-31
ZHEJIANG GUXIANDAO POLYESTER DOPE DYED YARN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, the advantage of one-step process of spinning and stretching is high efficiency, but its disadvantage is that since the stretching heat setting is carried out at a higher speed, the heating time of the filament bundle is shorter, and the crystal growth is not sufficient, so it cannot Meet the requirements of low shrinkage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Polyethylene terephthalate (PET low-viscosity slices) undergoes solid-state polymerization to become industrial-grade high-viscosity slices that can produce industrial yarns: low-viscosity PET slices are quantitatively fed into the crystallizer through a rotary valve, and heat is circulated at 180°C. Under the action of air, it is crystallized to a crystallinity of 30%, and then fed into the roof reactor through a rotary valve with an air lock device, and undergoes solid-phase polycondensation in a nitrogen environment at 230 ° C. By adjusting the residence time and nitrogen purity, the relative viscosity A low viscosity chip of 0.67 is viscosified to a high viscosity chip of a relative viscosity of 0.9. When the high-viscosity chips are cooled to 120°C, the nitrogen delivery system is used to transport the high-viscosity chips to the silo of the screw extruder.

[0028]2. Melted and extruded by the screw extruder, sprayed out from the spinneret hole, cooled slowly, ...

Embodiment 2

[0030] Embodiment two, preparation method and equipment are the same as embodiment one, the difference is that in step 3, the first step heat setting temperature is 245°C, the relaxation ratio is 4.4%, the second step heat setting temperature is 240°C, and the relaxation ratio is 7.6%; The slack ratio is around 12%.

Embodiment 3

[0031] Embodiment three, preparation method and equipment are the same as embodiment one, the difference is that in step 3, the first-step heat-setting temperature is 248°C, the relaxation ratio is 4.4%, the second-step heat-setting temperature is 245°C, and the relaxation ratio is 7.4%; The draw ratio is about 5.8, and the total relaxation ratio is about 11.8%.

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Abstract

This invention relates to the process of a kind of ultra-low contraction polyester fiber industry filament, which introduces the spinning and stretch one-stage process, including: solid phase increases sticks, melting spinning, high temperature stretches, heat setting, coiling formation. This invention adopts the innovative 5 pairs of hot rollers stretch heat setting technique, in comparison with the tradition 4 pairs, which adopts the 2-step heat stretch and 2-step heat setting. The new level heat setting processing method can reduce the textile fiber stretch speed effectively, lengthen the textile fiber heat setting time, and enables the textile fiber possessing evenly stable orientation structure, which guarantees product physics performance, optimizes the spinning condition. This ultra-low contraction polyester fiber industry filament preparation method provided with polyester fiber industry having high density, big module, small elongate, good heat-resisting performance, resisting impingement, and bearing the fagged performance.

Description

technical field [0001] The invention discloses a preparation process of ultra-low shrinkage polyester industrial filament, which belongs to the technical field of textile technology. Background technique [0002] Since the advent of polyester in the 1950s, great progress has been made in the development of industrial applications. Due to its low heat shrinkage, polyester industrial yarn is widely used in the field of narrow-width fabrics such as filter cloth, sunshade cloth, tarpaulin, etc. The dry heat shrinkage of traditional low-shrinkage polyester industrial yarn is about 2 %(177℃, 1min, 0.05g / D), the polyester industrial yarn with this level of dry heat shrinkage will have a large shrinkage rate and uneven shrinkage after being woven into cloth and heat-treated by coating, which may easily cause uneven cloth surface. Flat, so it can only be used for the weaving of narrow fabrics. In recent years, due to the rapid development of membrane structura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/08D01F6/62
Inventor 张朔
Owner ZHEJIANG GUXIANDAO POLYESTER DOPE DYED YARN CO LTD
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