Injection molding process of a plastic substrate for an optical disk
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United States of America Patent
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Mar 26, 1991
Grant Date -
N/A
app pub date -
Apr 18, 1989
filing date -
Apr 18, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for molding a transparent plastic substrate for a high-density information recording-reading system by injecting molten resin into a molding cavity defined by a pair of mold halves, characterized in that an axial dimension of the molding cavity is increased at least two times between the start of a shot of the molten resin and the end of the pressure-holding stage in an injection molding cycle.
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