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

Abstract

The invention relates to a principle and a method for producing various plastic pipe workpieces, in particular to a low-temperature near-melting point extrusion molding principle and a low-temperature near-melting point extrusion molding method for an axial self-reinforced plastic pipe, which are characterized in that: an extrusion molding process is implemented under a circumferential 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 by using an extruder, extruding melt, low-temperature near-melting point axial 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 axial direction; the material performance is optimally configured, and the actual requirements of pipes on the material performance are met. The orientation degree of the reinforced pipe in the axial direction is higher than that of the common pipe; and the wafer thickness of the reinforced pipe is thicker, 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, high production efficiency, low material cost, low production cost, excellent performance of products, capability of meeting industrialized production conditions and good industrialized prospect.

Description

Technical field: [0001] This technology involves the principles and methods of manufacturing various plastic pipe parts, especially the extrusion molding principle and method of plastic pipes in the axial direction to achieve self-reinforcement at low temperature and near melting point. 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 plastic pipes of various calibers is more prominent. However, plastic pipes are plastic products after all, and their rigidity and strength are far inferior to those of cast iron pipes. Therefore, they must be properly supported in engineering installations before they can be used safely, especially horizontal pipes. In the installation of horizontal pipes, no more than half a meter must be used as a support; moreover, plastic pipes are particularly vulnerable to damage. Dur...

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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 meet the shortcomings of thin wall, low cost, high benefit and high axial rigidity, etc. An extrusion molding method that simultaneously increases the axial stiffness and strength of the pipe without adding any other reinforcing agent and retains the improved performance

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