Method for preparing polyester staple fibers from waste polyester fibers

A technology of polyester staple fiber and polyester fiber, which is applied in the field of chemical fiber preparation, can solve problems such as poor hygroscopicity, and achieve the effects of high production efficiency, good circular economy spirit, and resource saving

Inactive Publication Date: 2016-04-27
CHANGSHU GOLD SPRING CHEM FIBERS & KNITTINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of fiber has a crisp appearance and good thermal stability, but its hygrosco

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First, the recovered polyester waste cloth with an intrinsic viscosity of 0.58-0.63dl / g is conveyed to the crusher for crushing through a conveyor belt equipped with a metal detection device for detecting metal mixed in the polyester waste cloth. The size of the broken ester waste cloth is less than 2cm×1cm, that is, less than 2cm 2 After being crushed by the crusher, it is transported to the compacting device through the conveying device (it can also be directly introduced into the compacting device from the discharge port of the crusher without the conveying device) and compacted in order to increase the bulk density and obtain a moisture content of less than 200PPm. dry polyester waste; then feed the dry polyester waste into the screw extruder for melt extrusion, and while the screw extruder melts and extrudes, the exhaust screw of the vacuum device installed on the screw extruder is used to pump Vacuum method is used to remove low-molecular substances in the raw mat...

Embodiment 2

[0020] First, the recovered polyester waste fibers with an intrinsic viscosity of 0.60-0.66dl / g are conveyed to the crusher for crushing through a conveyor belt equipped with a metal detection device for detecting metal mixed in the polyester waste fibers. After the fiber is crushed, the length is less than 2cm, and it is transported from the crusher to the compacting device through the conveying device (it can also be directly introduced into the compacting device from the discharge port of the crusher without the conveying device) and compacted in order to increase the bulk density. Obtain dry polyester waste with a moisture content of less than 200PPm; then feed the dry polyester waste into a screw extruder for melt extrusion, and when the screw extruder melts and extrude, the vacuum device configured on the screw extruder The exhaust screw removes low-molecular substances from the raw materials by vacuuming. The temperature of the melt extrusion of the screw extruder is: 27...

Embodiment 3

[0022] Firstly, the recycled polyester waste slurry with an intrinsic viscosity of 0.55-0.62dl / g is transported to the crushing machine through a conveyor belt equipped with a metal detection device (used to detect metals mixed in the polyester waste slurry for removal). Crushing in the machine, the size after crushing is less than 2cm×1cm×0.5cm, that is, less than 1cm 3After the crusher, it is transported to the compacting device through the conveying device (it can also be directly introduced into the compacting device from the discharge port of the crusher without the conveying device) for dewatering and compaction in order to increase the bulk density and obtain a product with a moisture content of less than 200PPm. Dry polyester waste; then feed the dry polyester waste into the screw extruder for melt extrusion, and at the same time the screw extruder is melted and extruded by the exhaust screw of the vacuum device on the screw extruder to evacuate The low-molecular subst...

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Abstract

The invention relates to a method for preparing polyester staple fibers from waste polyester fibers and belongs to the technical field of chemical fiber preparation. The method includes leading recycled waste polyester cloth, waste polyester fiber or waste polyester lumps into a crusher, leading the crushed materials into a compacting device for water removal and compaction to obtain dried polyester waste with the moisture content being less than 200PPm, then feeding the dried polyester waste into a screw extruder for melt extrusion, meanwhile vacuumizing to remove low molecular weight substances brought into the raw materials, filtering melt extruded via a screw extruder, leading the filtered melt into a spinning box via a metering pump for melt spinning, cooling and solidifying filaments extruded from a spinneret plate via cross air blow, oiling the filaments, gathering the filaments into tows and spooling to obtain nascent fibers; gathering the nascent fibers into tows via a creel, leading the tows into a drafting system via a godet machine for drafting, discharging from the drafting system to obtain draft filaments, and performing crimping, drying, relaxation setting, cutting off and packing to obtain finished products. The process is concise, and process stability is ensured; resources are saved; preparation efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of chemical fiber preparation, and in particular relates to a method for preparing polyester staple fiber from waste polyester fiber. Background technique [0002] Polyester fiber (polyesterfibre) is a general term for synthetic fibers obtained by spinning polyester obtained by polycondensation of organic dibasic acid and dibasic alcohol. Polyester fiber produced industrially is made of polyethylene terephthalate (PET), and the trade name in China is polyester. This kind of fiber has a crisp appearance and good thermal stability, but its hygroscopicity is slightly poor. It is used to make various clothing and bedding products, etc. [0003] In 1941, J.R. Winfield and J.T. Dixon of the United Kingdom first developed polyester fiber in the laboratory using terephthalic acid and ethylene glycol as raw materials, and named it Terylene. Produced by the United States in 1953, the trade name was Dacron, and then ...

Claims

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Application Information

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IPC IPC(8): D01D13/00D01D5/08D01D1/04D01D4/02D01G1/04D02J1/22
CPCD01D13/00D01D1/04D01D4/025D01D5/08D01G1/04D02J1/228D10B2331/04
Inventor 李嘉薇杨新华樊海彬
Owner CHANGSHU GOLD SPRING CHEM FIBERS & KNITTINGS
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