Apparatus for injection compression molding thin disc substrata

Details Apparatus for injection compression molding thin disc substrata Apparatus for injection compression molding thin disc substrata

1998-08-11

2000-12-26

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

425810, 264 133, B29C 4500

Patent

active

06164952&

ABSTRACT:
A mold for injection molding thin discs for DVD has a cavity (C) bounded by a information-bearing stamper (29) surface, a mirror plate (31) opposite to the stamper surface, and the tip (33s) of an inserting block (33) at a central opening in the mirror plate. The tip surface (33s) protrudes into the cavity past the surface of the mirror plate between 10 .mu.m and 70 .mu.m. The mirror plate molding surface is slightly frusto-conical, with a gradient Y/R gradually increasing the depth of the cavity toward the periphery. R is approximately 40 mm and Y lies in the range of 5 .mu.m and 30 .mu.m. The mirror plate is preferably manufactured flat on the surface facing the mold, but bolted down onto a frusto-conical backing plate or on top of a central ring, so that it is stressed into the desired shallow cone shape. The invention includes a method of injecting resin with lower clamping force of about 2 tons and then applying a higher force of about 17 tons.

REFERENCES:
patent: 4627809 (1986-12-01), Okabayashi et al.
patent: 5593710 (1997-01-01), Asai
patent: 5612062 (1997-03-01), Takahashi
patent: 5720994 (1998-02-01), Asai
patent: 5792492 (1998-08-01), Takahashi

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