B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/104
B29D 11/00 (2006.01) B29C 43/02 (2006.01) B29C 43/58 (2006.01) B29C 65/22 (2006.01) B29C 33/00 (2006.01)
Patent
CA 1254008
13 ABSTRACT PROCESS AND APPARATUS FOR CASTING LENSES The invention provides a process for casting lenses using male and female mould halves, which comprise placing a polymerisable liquid composition into the female mould half, introducing a male mould into the female mould along a substantially vertical axis until the male mould touches the surface of the liquid composition and then allowing the male mould to fall under its own weight into the female mould half and curing or allowing the polymerisable composition to cure. In addition, the invention includes apparatus suitable for carrying out the casting process which comprises a substantially horizontal support for the female mould, a holder for releasably holding the male mould, means for moving the holder towards and into the female mould along a substantially vertical path passing through the axes of the moulds and means for detecting contact between the male mould and the surface of the liquid composition and causing said holder to release the male mould. Preferably, the moulds are formed from a thermoplastic material and are maintained under a predetermined closing pressure by spot welding the flanges.
504540
Morland Albert
Warren Timothy
Coopervision Optics Limited
Moffat & Co.
Pbh Inc.
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