Low-temperature near-melting point extrusion molding principle and method for circumferential self-reinforced plastic pipe

Abstract

The invention relates to a low-temperature near-melting point extrusion molding principle and a low-temperature near-melting point extrusion molding method for a circumferential self-reinforced plastic pipe, which are characterized in that: an extrusion molding process is implemented under an axial shear stress field in a temperature environment of which the temperature is slightly higher than the melting point of the molded material. The method comprises the following processing steps: drying raw materials, plastifying the raw materials by using an extruder, extruding melt, low-temperature near-melting point circumferential self-reinforced molding, cooling and shaping, and cutting and collecting. The strength and modulus of the plastic pipe produced by the method are both reinforced in the circumferential direction, and can exceed or be close to those of the pipe in the axial direction, so that the material performance is optimally configured, and the actual requirements of pipes subjected to internal pressure on the material performance are met. The wafer thickness of the reinforced pipe is thicker, and the crystallinity of the reinforced pipe is higher, so that the heat resistance of the pipe is obviously improved compared with that of the common pipe. The method and the principle have the advantages of less equipment investment, low material cost, low production cost, excellent performance of products, and good industrialized prospect.

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 achieve self-reinforcement at low temperature and near melting point in the 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 compres...

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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. An extrusion molding method that can better improve the circumferential strength of the pipe without adding any other reinforcing agent

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