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Method for preparing special material of recycled polyester for high-purity chemical fibers

A technology of recycled polyester and special materials, applied in plastic recycling, recycling technology, mechanical material recycling, etc., can solve problems such as manual operation, heavy workload, complex process, etc., to ensure gloss, improve service life, Avoid yellowing effects

Inactive Publication Date: 2014-06-04
江苏中再再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of high-purity chemical fiber recycler that can solve the aforementioned problems in view of the problems of complex procedures in the existing waste PET recovery process described in the background technology, some procedures require manual operation, heavy workload, and low efficiency. Preparation method of recycled polyester special material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation method of recycled polyester special material for high-purity chemical fiber, it comprises the following steps:

[0028] Step 1 Unpacking, the whole bottle of bricks is broken up by the blade of the vertical or bedroom unpacking machine or the extrusion of the shaft and the shaft. The breaking rate must reach more than 98% to ensure the dispersion of the bottles;

[0029] Step 2 removes metal impurities, and the dispersed materials in step 1 pass through the metal detection device to remove the metal, and the metal detection efficiency must reach more than 99%;

[0030] Step 3 Rotate impurity removal, remove metal, glass, cloth strips, soil, bottle caps and labels and other impurities contained in the material through the rotary impurity removal device, and control the rotary sieve speed of the rotary impurity removal device at 60-100r / min;

[0031] Step 4 Near-infrared sorting, through the high-speed near-infrared detection and sorting system, com...

Embodiment 2

[0041] On the basis of embodiment 1, the metal detection device described in the above step 2 is a magnetic metal detection device or a non-magnetic metal detection device, or a series connection of these two metal detection devices, and the materials are processed successively.

[0042] Further, the metal detection device described in the above step 2 is a strong magnet type or an eddy current bouncing type detector.

Embodiment 3

[0044] On the basis of Example 1, the main washing process in the above-mentioned step 9 is carried out in a plurality of cooking pots connected in series. The series connection of multiple main washing units can not only make the production continuous, but also reduce the time for a single main washing to stay too long, increase the contact frequency between the bottle flakes and the cleaning liquid, and solve the problem of the following processes due to the long main washing time in a single boiler. The disadvantage of excessive air consumption of purification equipment.

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Abstract

The invention discloses a method for preparing a special material of recycled polyester for high-purity chemical fibers. The method comprises the following eleven process steps: unpacking, removing metal impurities, performing rotary impurity removal, performing near-infrared separation, performing visible light separation, performing whole-bottle cleaning, performing fragment pre-cleaning, removing pre-cleaning impurities, performing main washing, separating and purifying, conveying bottle chips to a storage bin. According to the method for preparing the special material of recycled polyester for the high-purity chemical fibers, metal impurities in bottle bricks are removed by adopting a metal detection device, the service lives of mechanical screw, grinding tools and other equipment can be effectively prolonged, shear stress is generated to strong marks on the surfaces of the bottle chips by utilizing centrifugal force of turbo prop, buoyancy of water and gravity of bottle chips, and bottle marks on the bottle chips are removed, so that the bottle chips can keep high cleanliness and are subjected to the main washing process, and the liquid replacement frequency during main washing is reduced. Meanwhile, the cleaning time and pressure during main washing can be effectively reduced, and the glossiness and transparency of the bottle chips are ensured.

Description

technical field [0001] The invention relates to the field of recycling and utilization of chemical raw materials, in particular to a method for preparing special recycled polyester materials for high-purity chemical fibers. Background technique [0002] Polyethylene terephthalate is polycondensed from terephthalic acid and oxalic acid, commonly known as polyester or PET. In recent years, PET has been widely used to make packaging bottles, and disposable PET packaging bottles have been The environmental pollution caused by discarding is becoming more and more serious, which has attracted worldwide attention. Recycling waste PET bottles can not only reduce environmental pollution, but also save resources. In the prior art, recycled waste PET bottles are usually pressed into bricks. When used, they need to be unpacked first. There are many sundries such as soil, metal impurities, glass, cloth strips, bottle caps and labels in PET bottles, and recycled PET bottles Bottles are ...

Claims

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Application Information

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IPC IPC(8): B29B17/00B29B17/02
CPCY02W30/52Y02W30/62
Inventor 何伟
Owner 江苏中再再生资源有限公司
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