Consolidated contact lens molding

Details Consolidated contact lens molding Consolidated contact lens molding

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B29C 31/00 (2006.01)

Patent

CA 2151353

An apparatus and method for automatically molding contact lenses from a polymerizable hydrogel comprises: a transport device for transporting a plurality of contact lens molds comprising first and second mold halves to and from a plurality of stations including a first automated station for receiving a plurality of first mold parts and depositing in each first mold part a predetermined amount of a polymerizable hydrogel; a second automated station for receiving the plurality of first mold parts and assembling each first mold part with a second mold part, under vacuum, to prevent entrapment of air between the mold parts; and, a procure station including a device for clamping the first mold half against the second mold half for a predetermined pressure and time to define a contact lens mold cavity and to remove any excess hydrogel from the cavity. The assembled first and second mold halves are further transported to a radiant energy source for polymerizing the polymerizable hydrogel in each mold cavity after the first and second mold halves are clamped together. Finally, the mold assembly having the polymerized hydrogel therein is transported to an automated demolding station for removing the second mold part and any excess hydrogel from the first mold part and the molded contact lens.

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