Injection molding process of a plastic substrate for an optical

Details Injection molding process of a plastic substrate for an optical Injection molding process of a plastic substrate for an optical

1989-04-18

1991-03-26

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Changing mold size or shape during molding or with shrinkage...

264 405, 2643287, 425149, 425150, B29C 4556

Patent

active

050027069

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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