METHOD FOR POST-INJECTION LAMINATION TO ADD A FUNCTIONAL FILM TO AN OPTICAL LENS
First Claim
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1. A method for laminating a functional film onto an injection molded thermoplastic lens that resides in an injection molding machine, comprising the steps of:
- injecting molten thermoplastic resin into a lens-forming cavity held closed under a primary clamp force;
opening the mold at a time when the lens is rigid enough to retain its shape and separate from one of the inserts;
depositing an unpressurized full metered charge of curable glue onto the center of the lens;
introducing a functional film between the glue and the separated insert; and
closing the mold to a secondary clamp force less than or equal to the primary clamp force to thinly spread the glue between the film and lens so that it cures with the heat transferred from the mold and the diminishing residual heat of the lens.
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Abstract
A method for laminating a functional film on to a thermoplastic injection molded lens. A thermally curable glue is deposited on the lens while it is still in the mold. A functional film is introduced and the mold is closed again. The heat from the mold and the clamping pressure thermoform the film and cure the glue, in a lamination process. A functionally enhanced lens having a film intimately laminated on to one side.
22 Citations
22 Claims
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1. A method for laminating a functional film onto an injection molded thermoplastic lens that resides in an injection molding machine, comprising the steps of:
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injecting molten thermoplastic resin into a lens-forming cavity held closed under a primary clamp force; opening the mold at a time when the lens is rigid enough to retain its shape and separate from one of the inserts; depositing an unpressurized full metered charge of curable glue onto the center of the lens; introducing a functional film between the glue and the separated insert; and closing the mold to a secondary clamp force less than or equal to the primary clamp force to thinly spread the glue between the film and lens so that it cures with the heat transferred from the mold and the diminishing residual heat of the lens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification