METHOD FOR PRODUCING THERMOPLASTIC RESIN PIPE, AND THERMOPLASTIC RESIN PIPE

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a thermoplastic resin pipe, the shrinkage at a high temperature of which is controlled while the impact strength and the mechanical strength are improved and which has good adhesion and excellent properties as a whole. SOLUTION: An original pipe pre-molded from a thermoplastic resin composition is stretched/molded with a prescribed difference in temperature generated between the inner and outer surfaces of the pipe, and the molecular orientation is made different between the inner surface side resin and outer surface side resin of the stretched/molded resin pipe.