| 摘要 |
PURPOSE:To obtain a mold for molding by which deflashing is unnecessary and the thin resin molded article of high precision is furnished, by providing the boundary part of a specified width and a groove around a cavity for molding provided on a metal plate. CONSTITUTION:A mold for molding is obtained by providing the boundary part 3 of a width less than 100mum around a cavity 2 for molding provided on a metal plate 1 and providing the groove 4 with a width larger than 300mum around said part 3. After the cavity 2 of the mold has been filled with powdery, granular or pellet like thermoplastic resin 5, the upper part of the mold is covered with a press plate 6 and it is heated to a melting temperature of the resin 5 under applicationof a pressure lower than 5kg/cm<2>. After the cavity 2 has been filled with the molten resin 5 and also it has been made to flow into the inside of the groove 4, passing a clearance between the press plate 6 and the boundary part 3, the press plate 6 is pressurized under a pressure higher than 30kg/cm<2>, the resin 5 is cooled and solidified in the state where the molten resin having flown into the groove 4 is separated at the boudnary part 3 and the resin molded article 7 free of a flash is obtained. |
