Taisei Plas Co., Ltd.

Masao Shiraishi

Masanori Naritomi

Naoki Ando

Masao Takahashi

The present invention is useful for achieving a reduction in weight and for attaining increased strength in not only electronic devices and domestic electric devices but also various parts and structures. As a pretreatment, a rib () is dipped in an aqueous solution of ammonia, hydrazine, a hydrazine derivative, or a water-soluble amine compound. A metal frame () is inserted into an injection mold for forming ribs () by injection molding. A thermoplastic resin composition is injected to the surface of the metal frame () by injection molding to form ribs (). In the housing of a casing cover () thus formed, the metal frame () and the ribs () made of the thermoplastic resin composition are integrally bonded together. Thus, the housing improves strength and external appearance. Moreover, a complicated configuration and structure can be formed in the housing.

Method for producing composite of aluminum alloy and thermoplastic resin

A pierceable stopper for a liquid container, which has a pierceable part made of a thermoplastic synthetic resin elastic material. The pierceable part is formed so as to prevent leakage of liquid from the container when it is pierced with a hollow needle. The pierceable part is confined in a compressed state in the stopper body of the pierceable stopper. A molten thermoplastic synthetic resin elastic material is injected into an injection mold at an injection pressure higher than the normal injection pressure to mold the pierceable part.

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Tokyo, Japan

Masao Shiraishi