| 摘要 |
PURPOSE:To mold a hollow spoiler with a uniform wall thickness and a smooth surface by a method wherein a specific powder thermoplastic resin is put in a mold, the resin is melted and molded into a product shape while the mold is rotated and revolved in a heating furnace to reach a predetermined mold temperature, and the resin is cooled with the application of an air pressure to be molded into a product. CONSTITUTION:A powder thermoplastic resin having a particle size of 5-95 mesh is put in a mold. As the powder thermoplastic resin, polypropylene, modified polyphenylene, acrylonitrile butadiene styrene, polycarbonate, polyamide, polyacetal, and the like are used. The resin is melted and molded into a product shape while the mold is rotated and revolved respectively at 2-20rpm in a 150-450 deg.C heating furnace to reach a mold temperature of 100-400 deg.C. Thereafter, the resin is cooled with the application of an air pressure not lass than 0.5kg/cm<2> to a hollow part in the mold to be molded into a hollow spoiler. |
