Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Changing mold size or shape during molding or with shrinkage...
Patent
1997-11-07
1998-12-29
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Changing mold size or shape during molding or with shrinkage...
264 19, 264 27, 264 26, 264334, 425395, 425407, 425408, 425436R, 425446, 425808, B29D 1100
Patent
active
058536272
ABSTRACT:
A plastic molding apparatus and method employs a pair of dies having at least one cavity with a mirror surface and wherein a plastic base material which is pre-molded is inserted into the cavity and clamped by the pair of dies. The plastic base material is then heated and melted at glass transition temperature or higher so that a resin internal pressure is generated, and then the plastic base material is annealed so that the mirror surface is transferred to the plastic base material. One of the dies has a separation die in which the cavity is formed. A cavity forming portion thereof has a cavity forming surface and a cavity side board portion which is adjacent to the cavity forming portion and surrounds the cavity forming surface. A separating die clamping structure clamps the separation die from both sides so as to compress an elastic member mounted between the cavity forming portion and the cavity side board. When the clamping pressure is released, the cavity forming portion and the cavity side board portion separate due to a resiliency of the elastic member. An engagement portion is formed at both edge portions of the cavity forming portion which contacts the cavity side board portion so as to engage with the plastic base material and control the release of the molded plastic from the dies.
REFERENCES:
patent: 5494615 (1996-02-01), Lee
patent: 5603871 (1997-02-01), Koseko et al.
Ricoh & Company, Ltd.
Vargot Mathieu D.
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