Patent ID: 6506335
Filing Date: 2003-01-14
Classification: B29C

Abstract:
A method of producing a hollow thermoplastic resin molded article having a laminated skin material, the method comprising the steps of:separating a female mold member and a male mold member of a mold for production of a hollow thermoplastic resin molded article to obtain a predetermined distance between said female mold member and said male mold member; feeding a skin material between the female and the male mold members; feeding a molten thermoplastic resin between the skin material and a cavity plane of the mold provided with a gas passage; closing said mold during or after said step of feeding of said thermoplastic resin; feeding gas into a cavity through at least one of a gas introducing member having a tip which does not protrude into the cavity and a gas passage which opens onto the cavity plane, and continuing to feed the gas until molding of the resin has been completed, wherein a lagging material is provided at the cavity plane adjacent at least one of said gas introducing member and gas passage; cooling the mold while maintaining a predetermined mold closure pressure after closing said mold to solidify the resin; and stopping gas feeding, opening the mold and removing the molded article.