A method for coating an ophthalmic lens within an injection...

B - Operations – Transporting – 29 – D

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B29D 11/00 (2006.01)

Patent

CA 2631367

A method for in-mold coating of an injection molded thermoplastic lens that resides in an injection molding machine oriented to a horizontal parting line(116). An optical lens(<1,<2) is initially formed by injecting molten thermoplastic resin into an edge-gated lens-forming cavity held closed under a primary clamp force. The mold (10, 12) is opened at a time when the lens is rigid enough to retain its shape. An unpressurized full metered charge of coating (6Of) is applied onto the center of the lens. The coating is co-molded by ramping up the clamp force from zero to a secondary clamp force less than the primary clamp force to compress the coating into a uniformly thick, fringe- free layer.

L'invention concerne un procédé de revêtement dans le moule d'une lentille thermoplastique moulée par injection dans une machine de moulage par injection orientée vers une ligne de séparation horizontale. Une lentille optique est d'abord formée par injection d'une résine thermoplastique fondue dans une cavité de formation de lentille à entrée latérale maintenue fermée sous l'action d'une force de fermeture principale. Le moule est ouvert lorsque la lentille est suffisamment rigide pour conserver sa forme. Une charge de revêtement dosée non soumise à pression est appliquée sur le centre de la lentille. Le revêtement est co-moulé par élévation de la force de fermeture de zéro à une force de fermeture secondaire inférieure à la force de fermeture principale en vue d'une compression du revêtement en une couche exempte de franges présentant une épaisseur uniforme.

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