Method for manufacturing resin pipe

A method of manufacturing a composite pipe, the method comprising steps of:

• forming a hollow cylindrical insert member having an inner surface;
• machining an outer surface of the insert member to form an annular groove therein, in a manner such that no step is formed in the annular groove;
• optionally, polishing the outer surface of the insert member;
• providing a split mold having a mold cavity formed therein, the mold cavity including a first cavity section having a first diameter, and an insert-receiving section configured to receive the insert therein, wherein the insert-receiving section is in communication with the first cavity section, and has a diameter larger than that the first diameter;
• placing the insert member into the insert-receiving section of the mold,
• closing the mold;
• and
• injecting a molten resin into the cavity and into the inner surface of the insert member to form an uncured pipe body;
• injecting an assist material into the cavity;
• and
• curing the resin, thereby integrating the pipe body and the insert member, wherein a portion of the pipe body is disposed inside of the insert member, and wherein the insert member is joined to the pipe body and becomes an integral part of the composite pipe.