Pretreatment process of processing recycled polyester staple fiber by using waste polyester bottle flakes

A technology of polyester bottle flakes and recycled polyester, applied in recycling technology, cleaning method using liquid, detergent composition, etc., can solve the problems of large water consumption, shortening pulverization time, limited cleaning effect, etc.

Active Publication Date: 2021-04-23
ANHUI DONGJIN RESOURCE REGENERATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional cleaning method is water washing, which not only consumes a lot of water, but also has limited cleaning effect, and cannot efficiently remove the dust and oil stains attached to the bottle flakes, and the subsequent drying takes a long time, thus prolonging the processing cycle
[0004] In order to solve this problem, our company has developed a pretreatment process for processing recycled polyester staple fiber by using waste polyester bottle flakes. Through two-stage crushing, the bottle flakes are converted into granules for easy cleaning and subsequent drying; Freezing treatment assistance method shortens the crushing time and ensures the crushing particle size; and the cleaning agent assistance method is used to ensure the cleaning effect while shortening the cleaning time and avoiding the problem of increasing the difficulty of cleaning wastewater treatment with conventional cleaning agents

Method used

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  • Pretreatment process of processing recycled polyester staple fiber by using waste polyester bottle flakes
  • Pretreatment process of processing recycled polyester staple fiber by using waste polyester bottle flakes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Two-stage crushing: First, transfer 50kg of waste polyester bottle flakes into a freezer at 5-10°C, and then transfer them out after the first-stage freezing treatment. 8mm granules, then transfer the obtained granules into the freezer at 0-5°C, and then transfer them out after secondary freezing treatment. Polyester pellets;

[0031] (2) Cleaning: Send the obtained waste polyester particles into the drum type cleaning machine, inject 250kg of cleaning liquid into the drum type cleaning machine, the cleaning agent is made by dissolving water, and clean at a rotating speed of 500rpm, the cleaning time is 10min, and the cleaning is over Finally, discharge the cleaning solution, and then unload the waste polyester particles;

[0032] (3) Drying: Send the washed polyester granules into a tumble dryer at a drying temperature of 75-80°C, and dry at a rotating speed of 350rpm until the water content is lower than 0.5wt%;

[0033] (4) Micronization: Transfer the dried pol...

Embodiment 2

[0036] (1) Two-stage crushing: First, transfer 50kg of waste polyester bottle flakes into a freezer at 5-10°C, and then transfer them out after the first-stage freezing treatment. 8mm granules, then transfer the obtained granules into the freezer at 0-5°C, and then transfer them out after secondary freezing treatment. Polyester pellets;

[0037] (2) Cleaning: Send the obtained waste polyester particles into the drum type cleaning machine, inject 250kg of cleaning liquid into the drum type cleaning machine, the cleaning agent is made by dissolving water, and clean at a rotating speed of 500rpm, the cleaning time is 10min, and the cleaning is over Finally, discharge the cleaning solution, and then unload the waste polyester particles;

[0038] (3) Drying: Send the washed polyester granules into a tumble dryer at a drying temperature of 75-80°C, and dry at a rotating speed of 350rpm until the water content is lower than 0.5wt%;

[0039] (4) Micronization: Transfer the dried pol...

Embodiment 3

[0042] (1) Two-stage crushing: First, transfer 50kg of waste polyester bottle flakes into a freezer at 5-10°C, and then transfer them out after the first-stage freezing treatment. 8mm granules, then transfer the obtained granules into the freezer at 0-5°C, and then transfer them out after secondary freezing treatment. Polyester pellets;

[0043] (2) Cleaning: Send the obtained waste polyester particles into the drum type cleaning machine, inject 250kg of cleaning liquid into the drum type cleaning machine, the cleaning agent is made by dissolving water, and clean at a rotating speed of 500rpm, the cleaning time is 10min, and the cleaning is over Finally, discharge the cleaning solution, and then unload the waste polyester particles;

[0044](3) Drying: Send the washed polyester granules into a tumble dryer at a drying temperature of 75-80°C, and dry at a rotating speed of 350rpm until the water content is lower than 0.5wt%;

[0045] (4) Micronization: Transfer the dried poly...

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Abstract

The invention discloses a pretreatment process for processing regenerated polyester staple fibers by using waste polyester bottle flakes, relates to the technical field of regenerated polyester staple fibers, and comprises the following steps: (1) two-stage crushing, (2) cleaning, (3) Drying, (4) micronization. The waste polyester particles obtained after the pretreatment process of the present invention can be directly used in the processing of regenerated polyester staple fibers, so as to avoid affecting the subsequent processing technology due to incomplete cleaning of dust and oil stains; and the obtained waste polyester particles belong to the micropowder level , which is conducive to the subsequent blending or reaction processing with other materials to make polyester staple fibers.

Description

Technical field: [0001] The invention relates to the technical field of processing recycled polyester staple fibers, in particular to a pretreatment process for processing recycled polyester staple fibers by using waste polyester bottle flakes. Background technique: [0002] The use of waste polyester bottle flakes to produce regenerated fibers is the main way to recycle polyester in my country. However, these fibers are mainly low-end cotton and filling products. Due to the expansion of production capacity and serious homogeneity, regenerated fiber enterprises in a low-profit state. Therefore, high-end and functional regenerated fibers are very necessary. [0003] However, dust and oil stains are attached to the recycled waste polyester flakes. If you want to process them into recycled polyester staple fibers, you need to clean the waste polyester flakes first. The conventional cleaning method is water washing, which not only consumes a lot of water, but also has a limited...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/04B08B3/08C11D1/66C11D1/722
CPCB08B3/08B29B17/0404B29B17/0408C11D1/662C11D1/722Y02W30/62
Inventor 施文东黄振祝建勋邢朝东陆松民王若愚
Owner ANHUI DONGJIN RESOURCE REGENERATION SCI & TECH
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