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.