Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Changing mold size or shape during molding or with shrinkage...
Patent
1995-09-25
1998-02-17
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 23, 264334, 264335, 425 73, 425808, 427164, B29D 1100
Patent
active
057188491
ABSTRACT:
Plastic injection-compression multi-cavity molding of flash-free improved-cleanliness thermoplastic spectacle lenses are suitable to be robotically dip hardcoated. Special spring-loaded molds having variable-volume mold cavities are used in an injection-compression molding process to form, without parting line flash, pairs of a wide range of differing optical power of polycarbonate Rx spectacle lenses. These pairs have special molded-on design features which are specially suited for full automation, starting with a novel way for ejection out of the mold into a takeout robot which is integrated via full automation with subsequent dip hardcoating. A molded-on tab with each pair of lenses is specially suited for manipulation by SCARA type robot. This combination produces micro-clean hardcoated paired molded lens made entirely within a single continuous cleanroom air enclosure surrounding the lenses, without any human operators therein, nor requiring any cutting or trimming of the molded paired lens or runner system before hardcoating, nor use of Freon (tm) CFC nor aqueous cleaning protocols before dipcoating. An extension of this cleanroom enclosure and robotic handling scheme may optionally provide in-line continuous-product-flow automatic inspection of optical power and lens cosmetic quality, and/or may optionally provide in-line continuous-product-flow anti-reflective thin film vacuum coating, before the molded-and-hardcoated polycarbonate lenses exit out of the continuous cleanroom air enclosure and/or receive any manual handling.
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"Processing Guide: Injection Compression Molding" by Doug Smock in Plastics World Magazine, Sep. 1995, pp. 31-36.
Galic George J.
Maus Steven M.
Galic Maus Ventures
Vargot Mathieu D.
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