Patent ID: 7988897
Filing Date: 2011-08-02
Classification: B29C,B29L,B65D

Abstract:
1. A manufacturing method of a synthetic resin hollow body (A) in which a molten resin is injected for an over-molding outside a hollow molding body (a) which is made of a resin, is hollow inside and is provided with at least an opening portion to form a resin sheathing body in an integrating manner with the hollow molding body (a), which method comprising the steps of: setting the hollow molding body (a) to a metal mold, blowing a gas as a fluid substance into the hollow molding body (a) while injecting a molten resin into the metal mold for an over-molding over the hollow molding body (a), and cooling the injected molten resin wherein the gas pressure in the hollow molding body (a) in the cooling of the injected molten resin is held to be lower than the blowing pressure of the gas blown in the injection of the molten resin.