Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Changing mold size or shape during molding or with shrinkage...
Patent
1997-01-29
1998-07-07
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Changing mold size or shape during molding or with shrinkage...
425352, 425808, B29D 1100
Patent
active
057763810
ABSTRACT:
In a process for the production of optical lenses, in particular contact lenses, a lens material is introduced between two mould halves. The mould halves each have a moulding surface and enclose a cavity in the closed state of the mould. After the lens material has been introduced the two moulding surfaces are moved towards each other and the lens material is enclosed in the cavity. If necessary, the lens material enclosed in the cavity is then polymerised. The first moulding surface is provided on the one mould half and the other mould half includes a mould part that is movable inside it with a close fit in the manner of a piston and on which the second moulding surface is provided, so that by moving that mould part towards the first moulding surface the cavity is closed. For this purpose, the two mould halves are first assembled, then the movable mould part which has the second moulding surface is moved in the direction towards the first moulding surface. With the mould halves assembled, the lens material is introduced between the two moulding surfaces before the cavity is closed.
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Ciba Vision Corporation
Lee Michael U.
Meece R. Scott
Vargot Mathieu D.
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