Mitsubishi Gas Chemical Company, Inc.

Kunio Yamazaki

Seizo Yabe

Akimasa Kaneishi

Akinori Toyota

Yoshiharu Ohtuki

A method for producing a handle-shaped molded article (1) having a thick grip portion (2) and at least one thick fitting portion (3) by injection molding using an injection molding apparatus (10) equipped with a mold having a cavity (60), a resin gate (46) provided in a portion (62) where the fitting portion is to be formed and a gas inlet (48) provided in a portion (64) where the grip portion is to be formed. A hollow structure (4) is formed in the grip portion (2) and a solid structure is formed in the fitting portion (3) by injecting a molten resin into the cavity (60) through the resin gate (46), thereby filling molten resin in a fitting portion-forming cavity zone formed of that portion (62) of the mold where the resin gate is provided and the fitting portion is to be formed and further filling molten resin in part of the rest of the cavity. A pressurized gas is introduced into the cavity (60) through the gas inlet (48) while maintaining an injection pressure, P, at a predetermined value, the injection pressure, P, being defined by

Method of injection molding with air assist for making a handle-shaped

A process for producing a synthetic resin molded article composed of a film or sheet and an injected resin part, comprising fitting a film or sheet to a cavity of a mold in position and then injection molding a thermoplastic resin, wherein said mold has a magnet buried therein at least at a position of the resin passageway at the gate or its vicinities or positions symmetrical about said passageway to form a magnetic fixing part and said film or sheet has a magnet or a ferromagnetic substance fitted thereto at a position or positions corresponding to said magnet fixing part of the mold. The process makes it possible to automate the step of fitting the sheet to the mold, and provides a large-sized or curved molded article excellent in apearance.

Process for producing synthetic resin molded articles

A process for producing a synthetic resin molded article having a pattern formed on its uneven surface, which comprises fitting a patterned film or sheet to a mold and injecting a thermoplastic resin, wherein said mold has engraved therein such an unevenness that said patterned film or sheet undergoes extension of from 5 to 120% upon resin injection, and said patterned film or sheet is a polycarbonate film or sheet having a thickness of from 0.1 to 1 mm. The resulting molded article has a clearly outlined pattern on the uneven surface.

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Osaka, Japan

Kunio Yamazaki