Special energy-saving extrusion screw and extruder for recycled plastic modification

Abstract

An energy-saving extrusion screw special for modification of reworked plastic comprises a screw body. An axis hole is formed in the screw body in the axis direction. The screw body is divided into a feeding section, a fusing section, a modification section and an extrusion section in sequence. A PTC thermistor is installed in the modification section. The PTC thermistor is connected with an external direct-current or alternating-current power source in the mode that a wire penetrates through the axis hole. The surface of the portion, in the modification section, of the screw body is made to dissipate heat by heating the modification section by the PTC thermistor, fused plastic passing through the modification section is reheated and subjected to extrusion modification so that the physical and chemical property of the plastic can be improved, and the extruded plastic has better toughness and high temperature and low temperature resistance.

Description

Technical field [0001] The invention relates to the technical field of plastic processing machinery, in particular to a special energy-saving extrusion screw for the modification of recycled plastics. Background technique [0002] Since the formation of the modern plastics industry in 1930, after more than 80 years of rapid development, the plastics industry has become the mainstay of the light industry. With the wide application of plastic products, huge plastic pollution has also been produced, causing great damage to the global ecological environment. The main treatment methods for waste plastic waste are landfill treatment and incineration treatment. However, landfill treatment occupies a large space and increases the pressure on land resources. At the same time, because waste plastic is difficult to degrade, it seriously hinders water penetration and groundwater circulation. Secondly, the additives in the waste plastics will cause secondary pollution to the land. Incinerat...

AI Technical Summary

Problems solved by technology

In the existing domestic market, there are many recycled and modified granulation machines for waste plastics, but most of them have insufficient ball milling fineness when modifying waste plastics in the regeneration stage, poor physical and chemical properties of recycled modified plastics, easy damage to equipment, and poor performance. Defects such as stability

In terms of the gap between the barrel and the screw of the waste plastic modification equipment, the gap between the existing similar products in China is generally about 80 wires. At the same time, due to the unqualified surface treatment technology of the screw, the screw is prone to expansion, and the screw thread and the inner wall of the barrel are prone to occur. Contact friction, which eventually prevents the device from functioning properly

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