| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of molding failure such that the water absorbing expansible nonwoven fabric wound around a core becomes burr to be exposed to the outer peripheral surface of a pipe joint when the pipe joint using the water absorbing expansible nonwoven fabric is manufactured by insert molding. SOLUTION: In the manufacturing method of the pipe joint made of a synthetic resin wherein the water absorbing expansible nonwoven fabric is provided to the inner peripheral surface of a pipe joint body part and the rib extending in the axial direction of the pipe joint is provided to the outer periphery of the pipe joint body part, the pipe joint is manufactured by a first process for installing the water absorbing expansible nonwoven fabric so as to wind it around the core of an injection mold, a second process for forming a cavity composed of a body forming part for forming the pipe joint body part and a rib forming part for forming the rib by the core and a splittable cavity mold, and a third process for injecting a resin into the cavity, and the rib forming part is provided so as to be adjacent to the split surface of the cavity mold. COPYRIGHT: (C)2010,JPO&INPIT |
