Apparatus and method for moulding contact lenses

B - Operations – Transporting – 29 – D

Patent

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B29D 11/00 (2006.01) B29C 33/40 (2006.01)

Patent

CA 2223302

A moulding apparatus for producing a contact lens the apparatus comprising: a two part mould having one moulding surface which is convex and a second moulding surface which is concave, the two surfaces together defining a sealed moulding cavity which receives a polymerisable material; characterised in that one or each of the mould parts include/s a region or regions wherein at least a part of the mould is flexible and which accommodates changes in volume of the polymerisable material within the cavity but with minimal or no axial movement of the mould parts.

La présente invention concerne un appareil de moulage qui permet de fabriquer des lentilles de contact. Cet appareil comporte un moule en deux parties qui possède une première surface de moulage convexe et une seconde surface de moulage concave, ces deux surfaces définissant ensemble une empreinte de moulage hermétiquement close qui reçoit une matière polymérisable. Cet appareil se caractérise en ce que l'une des deux (ou les deux) pièce(s) du moule comporte(nt) au moins une région à l'intérieur de laquelle au moins une partie du moule est flexible et peut s'adapter à des changements de volume de la matière polymérisable au sein de l'empreinte en ne provoquant que peu ou pas de déplacement axial des parties du moule.

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