Method and apparatus for treating an ophthalmic lens mold

Details Method and apparatus for treating an ophthalmic lens mold Method and apparatus for treating an ophthalmic lens mold

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B01J 19/08 (2006.01) B29C 33/00 (2006.01) B29C 33/44 (2006.01) B29C 37/00 (2006.01) B29C 39/22 (2006.01) B29C 59/10 (2006.01) B29C 59/12 (2006.01)

Patent

CA 2111740

An apparatus and method for directing accelerated electrons to at least part of one surface of one ophthalmic mold piece prior to filling with monomer and lens polymerization. In particular it has been found that generation of the ionized oxygen by means of a corona treatment electrode sufficiently increases the adherence of the polymer to the mold piece so treated. Tn the preferred embodiment, the flange around the convex, male piece of the lens mold is corona treated so that when the mold pieces are separated after lens polymerization, the flashing of excess polymerized material surrounding the lens cavity adheres to that male, convex piece flange while the lens is removed with the female, concave piece.

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