Matsushita Electric Industrial Co., Ltd.

Showa Denko K.k.

Showa Denko Kabushiki Kaisha

Nissei Plastic Industrial Co., Ltd.

Yoshihiko Yuzawa

Fumio Iriko

Fumio Kagawa

Wasuke Sato

Toshiaki Sakaida

Setsuyuki Takeuchi

Nobukuni Ibe

A mold for molding an optical disc includes a first mold member having a recess, and a second mold having a body and a plate-like sintered ceramic member secured to the body and having a flat seat surface. The recess and the flat seat surface jointly provides a mold cavity when the first and second mold members are mated together. A disc-shaped thin stamper is adapted to be seated on and detachably secured to the flat seat surface. The ceramic member is made of a ceramic material having Rockwell hardness (A-Scale) of not less than 90, so that the flat seat surface is not subjected to undue damage for a prolonged period of time.

Mold for molding optical disc

A method for manufacturing shaped articles by injection-blow molding. A thermoplastic material is first formed into a bottomed parison by injection-molding said material onto the surface of an injection molding core. The bottomed parison formed on the surface of the core is cooled to a temperature at which it is easily removed from the core, and is removed therefrom. The parison is heated again to a predetermined temperature and the reheated parison is transferred to a blow molding mold, wherein the parison is blow-molded.

Method for manufacturing shaped articles by injection-blow molding

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Yokohama, Japan

Yoshihiko Yuzawa