Method for producing terylene POY filament in scale by recycling PET bottle sheet material

Abstract

The invention provides a method for producing polyester POY filament in scale by recycling PET bottle chip. Recycled waste PET bottles are crushed into flaky bottle chip, dried after cleaning, and then sent into a crystallizing bed body; under the action of hot air entering the crystallizing bed body, crystallization is carried out, a crystallizing layer is formed on the bottle chip surface, and then the bottle chip is sent into a drying tower for drying; the dried bottle chip enters a screw extruder for melt extrusion, and the obtained melt is sent into a two-stage filtering device for filtering and then enters a spinning box; and a high-speed spinning process is adopted for spinning to produce the polyester POY filament. The method for producing the polyester POY filament adopts a filling type drying mode, the drying is even and the operating cost is low; a screw mixer is arranged in the drying tower, which solves the problem of 'arching' that happens to the recycled PET bottle chip during the drying process; and the two-stage filtering device is adopted, which ensures the filtering quality. Therefore, the high-end product-polyester POY filament can be continuously produced in large scale.

Description

technical field [0001] The invention provides a method for producing polyester POY filaments, in particular a method for large-scale production of POY filaments from recycled PET bottle flakes. Background technique [0002] Polyester (PET) bottles (such as mineral water bottles, beverage bottles, cooking oil bottles, etc.) are almost all non-biodegradable. With the improvement of people's requirements for environmental protection, processing and recycling waste polyester bottles has become a key issue for the sustainable development of the polyester industry. In recent years, although people have developed some recycling methods, they are limited to some low-end products and experimental fields. For example, use recycled PET bottle flakes (that is, flakes that are recycled from waste polyester bottles) to make short fibers, and use a small screw to produce filaments in the laboratory. Chinese Patent Publication No. CN1683612 discloses a "production method for directly prod...

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Problems solved by technology

[0005] This method of producing polyester POY filaments adopts a filling drying method to ensure uniform drying. Compared with drum drying, it solves the problem of inconsistent water content between drums in the large-scale production process, and the middle The process is less and the operation cost is low; the spiral agitator is set in the drying tower, which solves the problem that the recovered PET bottle flakes are easy to "bridge" in the drying process due to the small weight per unit volume and irregular shape; Two-stage filter for filtration, divided into two levels: coarse filtration and fine filtration. The coarse filter has fewer meshes to reduce the filtration pressure, and the finer mesh has more meshes to ensure the filtration quality and good filtration effect.

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