Plastic and nonmetallic article shaping or treating: processes – Forming sound grooves in records – Die pressing disk type records
Patent
1980-02-26
1982-01-26
Flint, Jr., J. Howard
Plastic and nonmetallic article shaping or treating: processes
Forming sound grooves in records
Die pressing disk type records
425127, 425128, 4251742, 4251744, 425389, 425437, 425405R, 425810, B29D 1700, B29C 300, B30B 300, B30B 928
Patent
active
043128238
ABSTRACT:
The invention relates to a method of manufacturing a plastic record carrier, in particular a video disc, in which a mold is provided with a fluid molding resin. A substrate is then deformed into a convex shape and pressed against the resin disposed on the center of the mold. The molding resin is rolled over the surface of the mold with a circular fluid front while the shape of the substrate is simultaneously changed from convex to planar form. After the molding resin has been spread over the entire mold and the planar substrate bears against the resin layer, the molding resin is then cured. The substrate is preferably deformed by flexibly supporting a planar substrate about its edge and then applying a different gas pressure on both sides of the substrate. The molding resin is preferably radiation-curable and is cured by exposure to, for example, ultra-violet light through the substrate.
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Broeksema Egbert
Kraakman Hillebrand J. J.
Nijboer Sjoerd
Briody Thomas A.
Flint, Jr. J. Howard
Streeter William J.
Tamoshunas Algy
U.S. Philips Corporation
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