MANUFACTURING METHOD OF OPTICAL DISK USING BIODEGRADABLE RESIN AND OPTICAL DISK FORMED BY THE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method suitable for a substrate for an optical disk using a biodegradable resin having low melting point and glass transition temperature.

SOLUTION: An optical disk manufacturing device is provided with a metal mold unit 1, an injection unit 2, a hopper unit 3 and a control unit 4. The injection molding unit 2 for injecting the resin into a metal mold 10 separately has a path for supplying material pellets and a path for sucking gas, moisture and impurities. When the biodegradable resin is melted in the injection unit 2 and injected into the metal mold 10 to manufacture the optical disk by injection molding, injection molding is performed in the state that temperature of the metal mold 10 is kept at room temperature.

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