Mold for production of hollow thermoplastic resin molded article, and process for production of hollow thermoplastic resin molded article using the same

摘要

A mold for producing a hollow thermoplastic resin molded article includes a set of female and male mold members and a gas passage provided in at least one of the mold members which opens directly onto a surface of the mold member. Alternatively, a gas introducing member for introducing gas into a cavity may be provided in communication with the gas passage such that the tip of the gas introducing member does not protrude into the cavity of the mold. A lagging material, such as an insulating material or a local heater is preferably provided in the area of the mold adjacent the gas passage or gas introducing member. A method of producing a thermoplastic resin molded article using a mold of this nature is also disclosed.