Apparatus and method for injection molding lenses

Details Apparatus and method for injection molding lenses Apparatus and method for injection molding lenses

1983-10-11

1985-09-10

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

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

249 82, 2643287, 2643289, 26432812, 425352, 425547, 425555, 425558, 425561, 425562, 425563, 425808, B29D 1100

Patent

active

045405344

ABSTRACT:
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.

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