Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Temperature control
Patent
1997-07-14
1998-10-13
Nguyen, Khanh P.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Temperature control
425143, 425149, 425150, 425562, 425575, 425590, B29C 4576, B29C 4577
Patent
active
058208917
ABSTRACT:
A molding apparatus produces high-density thin type optical disk substrates having good replicability and birefringence sufficient for practical use. In filling the resin into the cavity, the stress on the resin is reduced by controlling the relation of the cavity width and the injection compression force to reduce birefringence. Further, the mirror surface of the mold is maintained at a certain temperature to facilitate the resin flow and a good replicability and reduction of birefringence is achieved by terminating the resin filling and starting the compression process at the time at which the pressure of the resin filling is at a minimum.
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Rosato et al., Injection Molding Handbook, published by Van Nostrant Reinhold Company of New York, pp. 103-105 and 170-172 (196).
Matsushita Electric - Industrial Co., Ltd.
Nguyen Khanh P.
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