MOLD FOR JOINT HAVING STRUCTURES OF GROOVE FOR FITTING RUBBER RING AND SWIRLING RIB OR GROOVE AND ITS MOLDING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a structure of a mold for a joint having structures of rubber ring fitting grooves and swirling ribs or grooves which eliminates many of the undercuts the joint has in molding the plastic joint by injection molding and its molding method. SOLUTION: A mold constituting the basis is made by injection molding partly combined with blow molding without being taken out from the mold. The mold is opened to a specified position to form a space for inserting a blow molding mold. Grooves 2 for rubber rings are formed by pressing the mold utilizing the clamping force of the molding machine. At the same time, swirling rib 7 and the body of the molding are released by expanding outside surface 6 swollen by internal air. COPYRIGHT: (C)2006,JPO&NCIPI