Recycling device and method of waste polyester filaments

Abstract

The invention relates to the technical field of polyester fiber preparation, in particular to a recycling device of waste polyester filaments. The recycling device comprises a metal detection unit, acrushing unit, a purifying and separating unit, an extruding unit, a vacuum unit, a melt filtering unit and a pressure increasing unit, wherein the metal detection unit, the crushing unit, the purifying and separating unit, the extruding unit, the vacuum unit, the melt filtering unit and the pressure increasing unit are connected in sequence, and the pressure increasing unit outputs melts to a spinning device. In a recycling method of the waste polyester filaments, the melt directly spinning waste polyester filaments serve as raw materials, and the method comprises the steps of spinning melt preparation and melt spinning. According to the recycling device and method of the waste polyester filaments, the waste filaments obtained during the melt directly spinning production are used as the raw materials to obtain POY products of 270 dtes / 48 f and 155 dtex / 36 f, wherein the breaking strength of the POY products is higher than or equal to 1.9 cN / dtex, the CV% of the breaking strength is smaller than or equal to 5.0, the breaking elongation is 126+ / -5%, the CV% of the breaking elongation is smaller than or equal to 7.0, the CV% of the yarn unevenness is smaller than or equal to 1.6, theoil containing rate is 0.5+ / -0.1%, the intrinsic viscosity of the products is 0.560+ / -0.005 dL / g before being oiled, and the products obtained by using the method are high-quality polyester fiber products.

Description

technical field [0001] The invention relates to the technical field of polyester fiber manufacture, in particular to a recycling equipment and a recycling method of polyester waste silk. Background technique [0002] The total production of polyester fiber is huge, accounting for about 80% of the entire chemical fiber industry; the production waste in the polyester fiber industry chain is about 3.5 million tons per year, and the amount of waste after consumption is even as high as 23 million tons per year, but its comprehensive recycling rate is low at 5%. At present, the recycling methods of polyester waste silk at home and abroad are mainly divided into two categories: [0003] a. Use chemical methods such as alcoholysis or alkali hydrolysis to degrade polyester waste silk, and recycle it in the form of monomers; defects: the chemical process is complicated, and industrial "three wastes" are produced, and the products are insufficient in terms of economy and quality; [...

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Problems solved by technology

[0003] a. Use chemical methods such as alcoholysis or alkali hydrolysis to degrade polyester waste silk, and recycle it in the form of monomers; defects: the chemical process is complicated, and industrial "three wastes" are produced, and the products are insufficient in terms of economy and quality;

[0004] b. Washing, dehydrating, cutting and processing polyester waste silk into foam material, and then melt and extrude the foam material to make low-grade plastic or staple fibers; defect: during the remelting process of polyester waste silk, the viscosity is caused by thermal decomposition reduce, the obtained product has high content of mechanical impurities, large difference in batch viscosity, and large fluctuation of moisture content, which can only be used for the production of lower-quality short fibers; moreover, there are labor intensity, high energy consumption, and environmental pollution in the production process. Serious, not conducive to centralized management and other issues

[0005] Up to now, there is still a lack of an effective method for the efficient recycling of polyester fiber waste silk. The recycling method of waste silk using the physical process route is mainly to produce foam materials, and there is no direct spinning by manufacturers.

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