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Process for producing melt direct-spinning multifunctional PET (Polyester) industrial yarns

A polyester industrial yarn and production process technology, applied in melt spinning, stretch spinning, filament/thread forming, etc., can solve the problems of long material turnover period, high production energy consumption, high investment cost, etc., and achieve material turnover The effect of short cycle time, high production efficiency and increased production capacity

Active Publication Date: 2012-11-21
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

[0002] At present, the solid-phase polycondensation melt-spinning process route is widely used at home and abroad to produce polyester industrial yarns, that is, the low-viscosity polyester melt obtained by melt polycondensation is pelletized, dried, crystallized, and solid-phase polycondensed to obtain an intrinsic viscosity of 0.90-1.10. dl / g high-viscosity polyester chips, the chips are transported to the screw extruder with nitrogen gas for melting and mixed with functional melt at the screw outlet for spinning. Using this process to produce multi-functional polyester industrial yarn requires high equipment investment costs and short material turnover cycle. Long, high production energy consumption, and due to the flow rate, equipment and process limitations of the screw extruder, currently a single spinning position can only spin 4-8 heads at most

Method used

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  • Process for producing melt direct-spinning multifunctional PET (Polyester) industrial yarns

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Melt 16 ends of direct spinning 1000D (1110dtex / 192f) black high-strength polyester industrial yarn.

[0038] (1) Melt viscosity increase:

[0039] The low-viscosity polyester melt with an intrinsic viscosity of 0.64-0.69dl / g is obtained by melt polycondensation. The low-viscosity polyester melt is boosted by a booster pump and filtered by a double filter, and then transported to the vertical melt amplifier. The top of the viscous reactor, in the vertical melt viscosifying reactor, is naturally formed into a film by gravity and flows down evenly. The temperature in the vertical melt viscosifying reactor is 270-290 ° C, the pressure is 50-130 Pa, and it is obtained after 60-90 minutes. High-viscosity polyester melt with an intrinsic viscosity of 0.90-1.10dl / g.

[0040] (2) Melt direct spinning:

[0041] The high-viscosity polyester melt after melt viscosification is transported to the spinning box of each spinning position, and on the melt pipeline leading t...

Embodiment 2

[0069] Example 2: Melt 16 ends of direct spinning 1000D (1020dtex / 192f) anti-aging low-shrinkage polyester industrial yarn.

[0070] (1) Liquid phase thickening:

[0071] The low-viscosity polyester melt with an intrinsic viscosity of 0.64-0.69dl / g is obtained through polycondensation. The low-viscosity melt is boosted by a booster pump, filtered, and then sent to the top of the vertical melt viscosity-increasing reactor. It is naturally formed by gravity. The film flows down evenly, the temperature in the reactor is 270-290° C., the pressure is 50-130 Pa, and after 60-90 minutes, a high-viscosity polyester melt with an intrinsic viscosity of 0.90-1.00 dl / g is obtained.

[0072] (2) Melt direct spinning:

[0073] The high-viscosity polyester melt after melt viscosification is transported to the spinning box of each spinning position, and the function of melting through a separate small screw is injected on the melt pipeline leading to each spinning position The molten melt i...

Embodiment 3

[0102] Example 3: Melt 16 ends of direct spinning 1000D (1110dtex / 192f) hydrolysis-resistant low-shrinkage polyester industrial yarn.

[0103] (1) Liquid phase thickening:

[0104] The low-viscosity polyester melt with an intrinsic viscosity of 0.64-0.69dl / g is obtained through polycondensation. The low-viscosity melt is boosted by a booster pump, filtered, and then sent to the top of the vertical melt viscosity-increasing reactor. It is naturally formed by gravity. The film flows down evenly, the temperature in the reactor is 270-290° C., the pressure is 50-130 Pa, and after 60-90 minutes, a high-viscosity polyester melt with an intrinsic viscosity of 0.90-1.10 dl / g is obtained.

[0105] (2) Direct melt spinning:

[0106] The melt after viscosification is transported to the spinning box of each spinning position, and the functional melt melted by a separate small screw is injected on the melt pipeline leading to each spinning position, and passed through the pipeline The mi...

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Abstract

The invention discloses a process for producing melt direct-spinning multifunctional PET (Polyester) industrial yarns and belongs to the technical field of preparation of PET industrial yarns. The process is characterized by comprising the following steps of: (1) melt tackification, i.e., tackifying low-viscosity PET melt obtained by condensation polymerization by a melt tackifying reactor to obtain high-viscosity PET melt; (2) mixing of functional melt, i.e., conveying the high-viscosity PET melt to a spinning manifold through a melt pipeline to carry out spinning and mixing the functional melt and the high-viscosity PET melt in the melt pipeline according to a certain ratio; and (3) spinning, i.e., directly conveying the mixed functional high-viscosity PET melt to each spinning positions to carry out spinning; (4) drafting heat setting, i.e., carrying out two-stage drafting one-stage loosening heat setting on functional high-tenacity PET industrial yarns and carrying out two-stage drafting two-stage loosening heat setting on functional low-shrink PET industrial yarns; and (5) winding formation, i.e., carrying out winding formation after carrying out network processing on fibers subjected to drafting heat setting. According to the invention, the aim of producing the multifunctional PET industrial yarns by adopting the melt to carry out direct spinning is fulfilled; and the process has the advantages of low cost, high efficiency, uniformity and stability.

Description

Technical field: [0001] The invention relates to a production process of melt direct spinning multifunctional polyester industrial yarn, specifically belonging to the field of polyester industrial fiber manufacturing. Background technique: [0002] At present, the solid-phase polycondensation melt-spinning process route is widely used at home and abroad to produce polyester industrial yarns, that is, the low-viscosity polyester melt obtained by melt polycondensation is pelletized, dried, crystallized, and solid-phase polycondensed to obtain an intrinsic viscosity of 0.90-1.10. dl / g high-viscosity polyester chips, the chips are transported to the screw extruder with nitrogen gas for melting and mixed with functional melt at the screw outlet for spinning. Using this process to produce multi-functional polyester industrial yarn requires high equipment investment costs and short material turnover cycle. Long, high production energy consumption, and due to the flow rate, equipmen...

Claims

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Application Information

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IPC IPC(8): D01D5/08D01D1/04D01D1/06D01D5/088D01D5/096D01D5/12D01D7/00
Inventor 王建辉高琳马建平胡智暄江长明张朔
Owner ZHEJIANG GUXIANDAO POLYESTER DOPE DYED YARN CO LTD
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