Injection molding a lens onto a coated ophthalmic wafer
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United States of America Patent
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Mar 15, 2011
Grant Date -
Jun 21, 2007
app pub date -
Dec 21, 2005
filing date -
Dec 21, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of in-mold coating utilizing an injection molding machine oriented to a horizontal parting line. At the beginning of the cycle the mold opens and a charge of liquid coating solution is deposited onto the lower mold insert. A ophthalmic wafer is deposited on the coating to spread it across the insert surface. The mold is closed and a pre-cure phase elapses before the thermoplastic resin is injected into the mold cavity above the wafer. The process provides coated and functionally enhanced lenses upon ejection from the molding machine.
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