Method and apparatus for injection molding polycarbonate lenses

Details Method and apparatus for injection molding polycarbonate lenses Method and apparatus for injection molding polycarbonate lenses

B - Operations, Transporting

29

D

18/104

B29D 11/00 (2006.01) B29C 45/26 (2006.01) B29C 45/56 (2006.01)

Patent

CA 1227609

ABSTRACT OF THE DISCLOSURE An apparatus and method for molding polycarbonate lenses is disclosed in which the lenses are formed in a single injection molding operation. Polycarbonate is injected into a cavity between two movable dies which are forced apart by the injected polycarbonate. These dies are then urged together forcing a portion of the injected polycarbonate back through the same port through which the polycarbonate was injected. The finished lens does not have the knit line normally associated with injection molded lenses.

461178

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