Extrusion forming principle and method of plastic tubes for circumferential self-reinforcement

Abstract

The invention relates to an extrusion forming principle and method of plastic tubes for circumferential self-reinforcement, which is characterized by realizing extruded tube forming process under a circumferential shear stress field, wherein the process comprises the following steps in sequence: raw material drying, extruder plasticizing, melt extruding, forming for circumferential self-reinforcement, cooling shaping and cutting and collecting. The strength and modulus of the plastic tubes produced by the method are simultaneously reinforced circumferentially and exceed or approach the axial strength and modulus, thus configuring the properties of the materials more optimally and better satisfying the practical demands of the tubes subject to internal pressure for the material properties. After the tubes are reinforced, the wafers of the tubes are thicker and the tubes have higher crystallinity, therefore the heat resistance of the tubes is obviously improved compared with the conventional tubes. The invention is high in production efficiency, low in equipment investment, raw material cost and production cost and excellent in product property, can meet the conditions of industrialized production and has better industrialization prospects and economic benefits.

Description

Technical field: [0001] This technology relates to the principles and methods of manufacturing various plastic pipe parts, especially the principle and method of extruding plastic pipes to realize self-reinforcement in their circumferential direction. The invention belongs to the technical field of manufacturing plastic parts. Background technique: [0002] With the continuous development of the national economy and national infrastructure construction, the demand for large-diameter plastic pipes has become more prominent. In the water supply system, large-diameter pipes are often used as main pipes, and the pressure of the fluid conveyed is relatively high. However, at this time, since the circumferential stress of the pipe under internal pressure is twice its axial stress, the wall thickness of the pipe must be designed It must be thicker to meet its circumferential strength requirements. Therefore, in order to increase the compressive strength of the pipe, it is necessa...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings that the pipes produced by the current conventional plastic pipe extrusion molding method cannot simultaneously meet the shortcomings of thin wall, low cost, high benefit and high circumferential strength, etc. Extrusion molding method for improving the circumferential strength of the pipe without adding any other reinforcing agent

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