B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/104, 18/1150
B29D 11/00 (2006.01) B29C 33/00 (2006.01) B29C 43/34 (2006.01) B29C 43/36 (2006.01)
Patent
CA 1314377
METHOD AND APPARATUS FOR MOLDING AND CASTING USING GATED DIES ABSTRACT OF THE DISCLOSURE A method and apparatus for molding and casting ophthalmic lenses includes a front surface die and a back surface die slidably and removably received in the bore of a molding or casting apparatus. Molding or casting compound is introduced by conventional means between the two dies, and the dies are urged together to impress the die surfaces on the compound as the compound is cured by thermal or chemical means. At least one of the dies includes at least one gate channel formed in the edge thereof parallel to the axis of the bore and extending from the optical forming surface to a point adjacent to the opposite, external die surface in compression molding, the gate channel comprises a vent through which excess molding compound is discharged from the molding cavity as the dies are urged together. As the gated die is fully inserted in the bore, the gate channel opening to the exterior is sealed, thus limiting the discharge effect and controlling the thickness of the molded part. In casting, the dies are partially inserted in the bore, and the gate channel serves as an injection channel to introduce the casting compound into the casting cavity. The dies are urged together in the bore, the gate channel first serves to vent excess casting compound from the casting cavity. Full die insertion in the bore causes the gate channel opening to the exterior to be sealed, thus limiting the discharge effect and controlling the thickness of the cast part.
592461
Kingsbury Jeffrey M.
Pilkington Visioncare Holdings Inc.
Torys Llp
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