Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1988-06-27
1990-04-17
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
264 401, 264106, 2643281, 425192R, 425810, B29C 3330, B29C 4526
Patent
active
049178334
ABSTRACT:
An injection-moulding method for manufacturing discs from a synthetic material, which discs are provided with an information structure on one side, such as CD records, having a mould having a first and a second mould section (1, 2) which are movable relative to one another between an open and a closed position and which in the closed position define a mould cavity (3) into which a molten synthetic material is injected to form the disc, and having a flat mirror plate (12) on the first mould section, a disc-shaped stamper (16) which is positioned against the mirror plate, a guard ring (17) which is detachable from the first mould section to cover the periphery of the stamper (16) in an operating position, and quick-fastening device (18-20) which is adapted to cooperate with the guard ring (17) to secure the guard ring to the first mould section in the operating position. For changing the stampers a coupling device (33, 37) is provided which is adapted to couple the guard ring (17) to the second mould section (2).
REFERENCES:
patent: 4707321 (1987-11-01), Segawa et al.
patent: 4789320 (1988-12-01), Sasamura et al.
patent: 4790738 (1988-12-01), Shimojo et al.
Heitbrink Jill L.
Spain Norman N.
U.S. Philips Corporation
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