Method for producing hollow short fibre by regenerating polyester

A technology of recycled polyester and staple fibers, applied in fiber processing, hollow filament manufacturing, fiber chemical characteristics, etc., can solve the problems of recycled polyester waste with many impurities, unable to spin high-grade staple fibers, etc. The effect of reducing production cost and increasing filter area

Inactive Publication Date: 2003-11-19
NINGBO DAFA CHEM FIBER
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  • Abstract
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Problems solved by technology

[0003] In order to solve the above problems, the present invention provides the following technical solutions to improve the process and equipment, and improve the filtration accuracy, thereby solving the problem that the recycled polyester waste cannot be spun into high-grade short fibers in a short period due to many impurities

Method used

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  • Method for producing hollow short fibre by regenerating polyester
  • Method for producing hollow short fibre by regenerating polyester

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Embodiment Construction

[0010] In the embodiment of the present invention, polyester (PET) waste and polyester scraps are first prepared through a series of raw material preparations such as selection, cleaning, and crushing, and then dried in a high-temperature vacuum. The drying temperature is 130--145°C. The temperature is 0.085-0.096Mpa, and the drying time is 8-10h. The polyester waste after high-temperature drying is melted at high temperature, and extruded by a screw, and then the extruded melt is passed through a special pre-filter. To filter impurities in polyester waste, the filter consists of 19 filter elements arranged side by side in a filter cartridge with a volume of 0.0708m2. The filter area of ​​the filter cartridge is increased from the conventional 0.92m2 to 9.5m2, and the pre-filtration accuracy is also high. From the original 200 microns to less than 60 microns, the difference from the existing technology is that it is a super-large volume pre-filter. It is generally believed that...

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Abstract

A process for preparing hollow staples from regenerated polyester includes such steps as washing waste polyester, pulverizing, drying, fusing extruding, prefiltering, pump metering, module filtering, spinning by hollow spinnerette, cooling in circulating wind, drawing, winding, bundling, stretching in oil bath and then in over-heat steam, crimping, thermal shape fixing, cutting short, and packing. Its advantage is high P/C ratio.

Description

technical field [0001] The invention relates to a method for producing hollow short fibers from recycled polyester waste. Background technique [0002] In the chemical fiber industry at home and abroad, with the trend of "naturalization" of synthetic fibers, hollow fibers are widely used as fillers for bedding, thermal products and fabric toys because of their bulkiness and warmth retention. In the production practice of hollow fiber, there are two kinds of melt spinning and wet spinning. Among them, polyester staple fibers are produced by melt spinning, and polyester (PET, polyethylene terephthalate) new materials are usually used. To produce hollow staple fibers, as disclosed in Chinese invention patent 01108354.9, but such production costs are relatively high. In the process of reproducing hollow staple fibers from polyester waste in order to reduce costs, the following problems are generally prone to occur: First, because the recycled polyester waste c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D1/10D01D5/08D01D5/24
Inventor 杜国强
Owner NINGBO DAFA CHEM FIBER
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