Production process of single-screw extrusion recycling of waste PET (polyester) films

Abstract

The invention relates to a production process of single-screw extrusion recycling of waste PET films. By means of the sequential steps of waste PET film screening and washing, grinding and filtration, single-screw extrusion fusion, cooling and cutting, screening and single-screw extrusion fusion and biaxially die-oriented film production, the production process solves the long-standing technical problems in the prior art, such as great drop of the PET viscosity CV value, demand of the added recycling process on special drying, large consumption, poor environment-friendliness, low product strength, poor color and tensile property, poor flow stability and difficult stripping, achieves the technical advantages of simple process, high efficiency, small product quality fluctuation, high strength, uniform color and excellent two-way tensile property, and does not need double-screw extrusion.

Description

technical field [0001] The invention belongs to the technical field of waste film extrusion, in particular to a single-screw extrusion production process for recycling PET waste film. Background technique [0002] We know that there are many varieties of polyester (PET) films, and their functions are more refined. The main varieties are reinforced film for audio tape, reinforced film for video tape, easy-adhesive film, electrical insulation film, heat-resistant film, atomized film, highly transparent and easy-sliding film, light-guiding film, color film, weather-resistant film, anti-static film, resistance film Gas film, easy-to-cut film, transparent conductive film, surface gelled film, food packaging film, etc., but there is no literature report on the treatment and recycling of waste film produced from polyester. [0003] In recent years, heat-shrinkable packaging films have developed rapidly, and are expanding from a single PVC shrink film to PET, PE, PP, PVDC and othe...

AI Technical Summary

Problems solved by technology

[0024] The object of the present invention is to provide a production process for single-screw extrusion recycling PET waste film, which is followed by PET waste film material selection and washing, crushing and filtering, single-screw extrusion melting, cooling and pelletizing, screening single-screw extrusion melting and two-way Die stretching film production solves the problem of large drop in CV value of PET viscosity, complex recycling process, special drying, high consumption, low product strength, poor color and tensile properties, and stable flow in the prior art. Long-standing technical problems such as poor performance and difficult demoulding have achieved beneficial technical advantages such as no need for twin-screw extrusion, simple process, high efficiency, small fluctuations in product quality, high strength, uniform color, and excellent biaxial tensile properties.