| 摘要 |
PURPOSE:To heat and mold a thermoplastic resin sheet while avoiding the discoloration of the sheet material caused by foaming and oxidation during heating. CONSTITUTION:A thermoplastic resin sheet 1 is indirectly heated using upper and lower heaters 11, 14 of a short or medium wavelength with the max. energy wavelength of 1-3mum and held to a heated state by a frame 5 preheated to temp. in the vicinity of the softening point of the resin sheet to be three- dimensionally molded by female and male molds 2, 3. |
