METHOD FOR INJECTION COMPRESSION MOLDING OF THIN MOLDED ARTICLE AND ITS APPARATUS

PROBLEM TO BE SOLVED: To provide a method for injection compression molding of a thin molded article in which birefringence and an angle of warpage are small, and transfer of a recording pit and the like are enough ensured and also to provide an apparatus for injection compression molding using method for same molding. SOLUTION: In the method for injection compression molding of the thin molded article wherein after a pair of a movable mold and a fixed mold for forming a cavity are brought into contact with each other, an injection apparatus is driven and operated to perform injection and filling and during this period, on a mold clamping apparatus side, a mold clamping holding process wherein a molten resin is received in the cavity and successively, a mold clamping compression process wherein the recording pit is transferred on the surface of the molten resin are performed, the mold clamping holding process is formed as multi-steps comprising a step wherein a mold opening/ closing driving mechanism and a mold clamping driving mechanism are made to be an unloading condition in such a way that the movable mold does not disturb flow of the molten resin to the molten resin flowing into the cavity and a step wherein the mold clamping driving mechanism is controlled in such a way that a specified mold clamping force is provided to the molten resin flowing into the cavity through the movable mold. COPYRIGHT: (C)2003,JPO