Method for producing dyed hollow filaments by recycled polyester

A recycled polyester and hollow technology, which is applied in the manufacture of hollow filaments, single-component polyester artificial filaments, filament/thread molding, etc., can solve the problem of uneven polymerization of polyester molecular weight, reduce spinning performance, and increase energy Consumption and other issues, to achieve uniform average molecular weight distribution, ensure spinning performance, not easy to break the effect

Inactive Publication Date: 2017-12-08
JIANGSU FEILIN FIBER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Its disadvantages are: the production of recycled polyester fiber by this method needs to be heated into a melt, depolymerized, and then polycondensed, which increases energy consumption
The main reason is that, in the production process of waste polyester materials, part of the polyester is decomposed, and in the process of use, it will be oxidized after contact with air, which will also cause the breakage of some bonds, making the molecular weight polymerization of polyester uneven, reducing the Spinning performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for producing dyed hollow filaments utilizing regenerated polyester, comprising the steps of:

[0021] 1) Preparation of recycled raw materials: chop the waste polyester, wash it to remove dust, then go through centrifugal dehydration, and then dry it with hot air at 50°C for 40 minutes;

[0022] 2) Extrude the dried recycled raw material through a screw extruder to make recycled masterbatch;

[0023] 3) Send the regenerated masterbatch into the solid-phase thickening device in a vacuum state. At 180°C and a vacuum of 100Pa, the thickening time is 8 hours;

[0024] 4) Mix the thickened material with the color masterbatch and send it to the screw extruder for mixing and extrusion;

[0025] 5) The colored mixed melt extruded from the screw extruder is spun through a hollow spinneret to obtain hollow filaments; the circular exit channel angle of the hollow spinneret is 55°; the hollow filaments The hollowness is 15%, which is achieved by the size ratio of the so...

Embodiment 2

[0032] A method for producing dyed hollow filaments utilizing regenerated polyester, comprising the steps of:

[0033] 1) Preparation of recycled raw materials: chop the waste polyester, wash it to remove dust, then go through centrifugal dehydration, and then dry it with hot air at 50°C for 40 minutes;

[0034] 2) Extrude the dried recycled raw material through a screw extruder to make recycled masterbatch;

[0035] 3) Send the regenerated masterbatch into the solid-phase thickening device in a vacuum state, at 160°C, vacuum degree 800Pa, and the thickening time is 5 hours;

[0036] 4) Mix the thickened material with the color masterbatch and send it to the screw extruder for mixing and extrusion;

[0037] 5) The colored mixed melt extruded from the screw extruder is spun through a hollow spinneret to obtain hollow filaments; the circular exit channel angle of the hollow spinneret is 65°; the hollow filaments The hollowness is 28%, which is achieved by the size ratio of the...

Embodiment 3

[0043] A method for producing dyed hollow filaments utilizing regenerated polyester, comprising the steps of:

[0044] 1) Preparation of recycled raw materials: chop the waste polyester, wash it to remove dust, then go through centrifugal dehydration, and then dry it with hot air at 75°C for 20 minutes;

[0045] 2) Extrude the dried recycled raw material through a screw extruder to make recycled masterbatch;

[0046] 3) Send the regenerated masterbatch into the solid-phase thickening device in a vacuum state. At 170°C and a vacuum of 500Pa, the thickening time is 7 hours;

[0047] 4) Mix the thickened material with the color masterbatch and send it to the screw extruder for mixing and extrusion;

[0048] 5) Spin the colored mixed melt extruded from the screw extruder through a hollow spinneret to obtain hollow filaments; the angle of the circular exit channel of the hollow spinneret is 55-65°; the hollow spinneret The hollowness of the filament is 20%, which is achieved by t...

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Abstract

The invention discloses a method for producing dyed hollow filaments by recycled polyester in the field of polyester fiber production methods. The method includes: preparing a recycled material, and making the recycled material into recycled masterbatch; subjecting the recycled masterbatch to solid-phase tackifying under a vacuum state; mixing the tackified material and masterbatch, sending into a screw extruder to realize mixing and extruding, and spinning through a hollow spinneret plate to obtain hollow filaments; cooling and blowing the filaments under the protection of nitrogen; oiling, and subjecting multiple strands of filaments to interlacing treatment through an interlacing jet; winding and storing. The method can be used for recycling of various waste beverage bottles and textile offcut materials, and environmental friendliness and low energy consumption are realized.

Description

technical field [0001] The invention relates to a production method of polyester fiber, in particular to a method for producing fiber filament by using waste polyester fiber. Background technique [0002] In the prior art, there is a preparation method of regenerated polyester fiber, its application number: 201410608104.0; application date: 2014-11-03, publication number: 104357938A; publication date: 2015-02-18; In the field of chemical regeneration of esters, a dihydric alcohol titanium alkali metal coordination compound that can be dissolved in ethylene glycol is used as a catalyst to catalyze the depolymerization of ethylene glycol and the repolymerization of depolymerization products of waste polyester products. The ethylene glycol depolymerization of the ester and the repolymerization process of the depolymerization product all have higher catalytic activity, so in the preparation method of the regenerated polyester fiber, the process of preparing the regenerated polye...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/24D01D5/088D01F6/92D01F1/10
CPCD01D5/088D01D5/24D01F1/10D01F6/92
Inventor 朱光宇
Owner JIANGSU FEILIN FIBER TECH
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