摘要 |
PROBLEM TO BE SOLVED: To provide a method for molding a thin wall foamed molding which can obtain the thin wall, fine and uniform foamed molding having a high foam density even by a resin material having a low fluidity. SOLUTION: The method for molding the thin wall foamed molding includes an injection step of injecting a molten resin in which a carbon dioxide is dissolved in a short shot state after a counter pressure is applied to a cavity (12) of molds (1, 10) by a carbon dioxide gas, a filling completing step of driving the movable mold (10) in a direction for reducing the volume of the cavity (10) to spread the molten resin injected in the injection step, a holding step of holding a position of the mold (10) at the filling completing step until a temperature of the injected/filled molten resin is lowered to a predetermined foaming temperature, and a foaming step of foaming the molten resin by releasing the counter pressure of the cavity (12) and driving the movable mold (10) to a predetermined position in a direction for increasing the volume of the cavity (12). COPYRIGHT: (C)2004,JPO |