Method of molding a disc substrate

Details Method of molding a disc substrate Method of molding a disc substrate

1995-08-02

1997-06-24

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432816, B29C 4504, B29C 4573

Patent

active

056414471

ABSTRACT:
A method of molding a disc substrate, includes the steps of: fitting a movable die and a fixed die for a disc substrate onto a movable platen and a fixed platen of a molding machine, respectively; bringing the movable die and the fixed die in close contact with each other through a mold closing operation where the movable platen moves through a mold clamping cylinder; filling a given quantity of melting resin into a cavity of the movable and fixed dies for the disc substrate from a nozzle of an injection unit through a screw within a heating cylinder in a state where a mold clamping hydraulic pressure is zero; and after the completion of the injection process, implementing a mold clamping pressure control of one stage or a plurality of stages by application of a mold clamping pressure, and simultaneously conducting a process of cooling a melting resin.

REFERENCES:
patent: 4879082 (1989-11-01), Kudo et al.
patent: 4986938 (1991-01-01), Izuka et al.

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