| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a thermoplastic resin foamed molded product having no dent in its surface, excellent in smoothness and having a uniform cell structure. SOLUTION: The manufacturing method of the thermoplastic resin foamed molded product is constituted by charging a molten thermoplastic resin containing a foaming agent in the mold cavity formed by a pair of molds to foam the same and comprises a process (1) for setting the pressure in the mold cavity formed by a pair of the molds to atmospheric pressure or below, a process (2) for filling the mold cavity with the molten thermoplastic resin containing the foaming agent of which the volume is not larger than the volume of the mold cavity, a process (3) for cooling the molten thermoplastic resin containing the foaming agent charged in the mold cavity until the highest temperature of the molten thermoplastic resin containing the foaming agent becomes a temperature from the (crystallization temperature-15°C) of the thermoplastic resin to the (crystallization temperature+15°C) thereof, a process (4) for increasing the volume of the mold cavity until the desired shape of the thermoplastic resin foamed molded product is obtained to foam the molten thermoplastic resin containing the foaming agent and a process (5) for opening the molds to eject the thermoplastic resin foamed molded product. COPYRIGHT: (C)2006,JPO&NCIPI |
