Toyoda Gosei Co., Ltd.

Hirohisa Narukawa

Hiroshi Mukai

Akiyoshi Nagano

Yasunobu Teramoto

Sadao Nada

Hidetaka Fukamachi

Chiaki Komiyama

Yoshihiro Inada

Akihiro Yoshida

A sandwich molded article comprising a thick skin or outer layer, a thin skin or outer layer, and a core layer surrounded by these skins or outer layers. A process for producing said sandwich molded article by the use of a mold(s) which comprises adjusting the temperature of an inner surface of the mold corresponding to a skin portion of the molding desired to be made thick, to a temperature lower than that of an inner surface of the mold corresponding to a skin portion of the molding desired to be made thin; injecting a skin material in a softened state into the mold; and then injecting a core layer material in a softened state into the skin material. According to the present invention, there can be obtained a sandwich molded article having a core layer from which the distances to the obverse and the reverse of the molded article are different. This molded article can be given a satisfactory decorative surface and has deformation-preventing ability.

Process for producing a sandwich molded article

Molding a hollow shaped body which has a skin made of a synthetic resin and a hollow portion therein by a mold block provided with a mold cavity in the shape of the hollow shaped body, a tub into which an excess amount of the synthetic resin can flow and a small flow path communicating between the mold cavity and the tub. The process includes forming the skin of the hollow shaped body by injecting a molten synthetic resin into the mold cavity to fill up the cavity. Thereafter, a gas is introduced into the injected synthetic resin to thereby form the hollow portion. The gas injection forces a part of the synthetic resin out of the mold cavity and into the tub through the small flow path.

Method for molding hollow shaped bodies

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Inazawa, Japan

Hirohisa Narukawa