| 摘要 |
PURPOSE:To prevent generation of flashes by a method wherein at the time of shaping of the outside by expanding a thermoplastic material with fluid pressure of medium low pressure, a matter formed with an elastomer mold where at least the side forming a design surface of a product cavity is backed up with a rigid material is used. CONSTITUTION:Since an elastomer mold 9 is backed up with a female mold 3A made of a metal, though the elastomer mold 9 is soft, and it is shaped with fluid pressure (foaming pressure) of medium low pressure lower than injection pressure, the form of a cavity of the elastomer mold 9 is reversed precisely to a molded product. Although an intrinsic parting line PL 10 between a male and female molds 1A, 3A comes to the same part as a traditional one, it is not connected directly with a product cavity. An outward PL 10a connected directly with the product cavity is on a cavity surface forming a backside of the product. Since abutting at that part is of a pressure contacting between the male mold (rigid body) 1A and elastomer mold 9, even if a male mold side (formed of a rigid material) is not formed with favorable accuracy, at the time of mold clamping, that is, pouring time of a material, the outward PL 10a is sealed and it is hardly feared that flashes are generated on the same. |
