Tohoku Munekata Co., Ltd

Atsushi Tsuchiya

Hirofumi Tateyama

The present invention provides an injection molding method for providing a molded product with excellent transcription and an excellent gloss level. In this method, immediately after a resin is filled in a cavity ( ), a carbon dioxide gas is injected or the skin layer is moved back to form a space ( ) between the resin and the die surface ( ), so that growth of the skin layer is hold down, and at the same time the carbon dioxide is dissolved in the skin layer for lowering the glass transition point of skin layer. Then the skin layer is again closely cohered to a surface of the die by increasing the resin pressure and cooling the molded product for solidifying behind the holding pressure. With this method, products with excellent transcription and with an excellent surface gloss level can be obtained.

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Fukushima, Japan

Atsushi Tsuchiya