| 摘要 |
PURPOSE: To provide a resin mold not generating the adhesion of an excessive resin to a resin molded product and surface inferiority such as weld or a sink in a hollow molding method. CONSTITUTION: The cavity 1 formed by upper and lower molds A, B, fluid pressure introducing ports 6, 6 introducing a hollow part forming fluid under pressure to form a hollow part in the molten resin 2 charged in the cavity 1 to fill the cavity with a resin molded product by the pressure of the fluid, the movable cores 70, 70 provided to a part of the cavity 1 and moving while increasing the cavity by the quantity corresponding to the vol. receiving the molten resin 2 to finally deform the inner surface of the cavity 1 to the shape of the resin molded product and a control part 10 controlling the moving speed of the movable cores 70, 70 to a predetermined range are provided. |
