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Manufacture method for producing high-shrinkage regenerated terylene short fiber with recovered polyester bottle chips

A technology of recycled polyester and its manufacturing method, which is applied in the direction of single-component polyester rayon, melt spinning method, stretch spinning method, etc., and can solve the problems of recycling restrictions, screw loop resistance material, and low melting point of non-crystalline polyester and other problems to achieve the effect of solving low shrinkage rate, poor stability and stable shrinkage rate

Active Publication Date: 2013-01-09
宁波大发新材料有限公司
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AI Technical Summary

Problems solved by technology

[0003] However, due to the low melting point of non-crystalline polyester, it is easy to stick, which seriously affects the drying effect and causes the screw ring to block the material, so the recycling of this type of polyester is greatly restricted.

Method used

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Embodiment Construction

[0014] An example of the manufacturing method described in the patent of the present invention is provided below.

[0015] Take the hollow polyester staple fiber with 6.67dtex×102mm and boiling water shrinkage of 45% as an example. Include the following steps:

[0016] 1) When the non-crystalline PET sheet is dried, the drying temperature of the vacuum drum is 100 ℃, and the drying time is 6 hours; the ratio of the non-crystalline PET sheet to the PET bottle flakes (mass percentage) is 45%: 55%; mixed uniform flakes Material and bottle flakes are put into the spinning silo;

[0017] 2) Then put it into the screw for extruding and melting to obtain the melt. The screw temperature is 265℃ which is usually higher than that of PET bottle flake spinning;

[0018] 3) On the basis of existing spinning equipment, adopt 1800 hole C-type spinneret, pump supply 4000g / min, spinning speed 850m / min, spinning temperature 272℃; cooling air temperature 30℃, low blowing speed To 0.6m / s, the draw rati...

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Abstract

The invention relates to regenerated terylene short fiber production technology, in particular to a manufacture method for producing high-shrinkage regenerated terylene short fiber with recovered polyester bottle chips. The manufacture method comprises the steps as follows: drying amorphous polyester chips through a low-temperature drying method; mixing the dried amorphous polyester chips with common PET (polyethylene terephthalate) bottle chips; putting the uniformly mixed chips and the bottle chips into a spinning material bin, and then putting into a screw for extruding and smelting so as to obtain smelt; conveying the melt which meets the spinning requirement to a a filter under the effect of a melt conveying pump for filtering, and then putting into a spinning box body; spinning while metering, cooling and applying oil, pulling to feed, and falling into a barrel; finally stretching at low temperature during the post-processing of as-spun fiber. The manufacture method provided by the invention has the characteristic of being high in heat absorbing property; and the production of regenerating the high-shrinkage regenerated terylene short fiber can be achieved.

Description

Technical field [0001] The invention relates to a process for producing recycled polyester staple fibers, in particular to a method for producing high-shrinkage recycled polyester staple fibers from recycled polyester bottle flakes. Background technique [0002] In recent years, with people’s continuous pursuit of differentiation in polyester production, the source of recycled polyester has become more and more complex. The recycled polyester often contains a variety of different materials that are different from those used in polyester staple fiber manufacturing. The crystalline polyester sheet, film, etc. caused by the processing of ordinary polyester staple fiber is affected by modified polyester, which causes the quality of recycled polyester staple fiber to fluctuate. Tests show that the material that causes fluctuations in the quality of ordinary polyester staple fibers is PETG, PCTG and PCTA, which are non-crystalline copolyesters. The material has good heat shrinkability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/62D01D5/08D01D5/12D01D1/04D01D10/02
Inventor 钱军邢喜全王方河贾同伟杜芳
Owner 宁波大发新材料有限公司
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