Method for producing dacron FDY (Fully Drawn Yarn) filaments in large scale by utilizing recycled PET (Poly Ethylene Terephthalate) bottle chips
A technology of bottle flakes and polyester, which is applied to the melting of filament raw materials, single-component polyester artificial filaments, etc., and can solve the problems of small volume and quality of recycled PET bottle flakes, instability, and inconsistent water content between drums and other drums.
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[0006] The present invention is further described below.
[0007] The bottle flakes are sent into the crystallization bed, and when crystallization is carried out under the action of hot air entering the crystallization bed, the crystallization temperature is 165-168° C., and the crystallization time is 15-30 minutes. When sent to the drying tower for drying, the drying temperature is 170-175°C, and the drying time is 3-4 hours, so that the moisture content of the polyester bottle flakes is ≤50ppm. When the dried bottle flakes enter the screw extruder for melt extrusion, the temperature in the cooling zone of the screw extruder is ≤50°C, and the temperature in the first zone to the sixth zone is 278-289°C, increasing zone by zone. When the obtained melt is sent to a two-stage filter device consisting of a coarse filter, a fine filter and a booster pump between the two for filtration, the filtration accuracy of the coarse filter is 40 μm, and the filtration accuracy of the fine...
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