| 摘要 |
PROBLEM TO BE SOLVED: To provide a molding method for a foamed resin molded body, the appearance performance of which is enhanced by preventing poor outside appearances such as silver streaks from developing through the checking of a gas blowing reaction at the injection filling of a foaming resin material in the molding method of the foamed resin molded body utilizing injection molding. SOLUTION: After molds are clamped together by lowering a cavity mold 30 to its bottom dead center, the foaming resin material M is injection-filled in a product cavity C. At the injection filling, the cavity mold 30 is pushed upwards by the resin pressure of the foaming resin material M. The resin is preferably filled so as to gradually accelerate the ascending speed of the cavity mold 30 so as to perform a primary pressurizing under the condition that a proper clearance is kept. After that, the cavity mold 30 is raised forcibly so as to perform an ununiform blowing-free gas blowing reaction by ensuring a blowing space, resulting in molding the foamed resin molded body 12 with a favorable surface outside appearance and with no varied wall thickness. COPYRIGHT: (C)2004,JPO |
