Method for molding plastic material into disk shaped sabstrate f

Details Method for molding plastic material into disk shaped sabstrate f Method for molding plastic material into disk shaped sabstrate f

1987-11-27

1989-11-07

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

264 13, 425149, 425810, B29D 1100

Patent

active

048790826

ABSTRACT:
A method for molding a substrate for optical information record carrier is disclosed which results in small double refraction with superior transfer characteristics of a surface of a stamper. The method comprises the steps of injecting molten resin into a cavity formed by a stationary mold and movable mold under application of mold clamp pressure between said molds, releasing the mold clamp pressure at predetermined timing after injection of said molten resin is completed and the molten resin is partially solidified, holding said resin in the molds under the released mold clamp pressure condition until the resin is solidified, and taking out the molded substrate from the molds.

REFERENCES:
patent: 4302411 (1981-11-01), Nakagawa et al.
patent: 4411609 (1983-10-01), Yoshii et al.
patent: 4414167 (1983-11-01), Prusak et al.
patent: 4426341 (1984-01-01), Tsuzuku et al.
patent: 4707321 (1987-11-01), Segawa et al.
patent: 4734477 (1988-03-01), Inoue et al.

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