Process and device for the manufacture of mouldings and...

B - Operations – Transporting – 29 – D

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B29D 11/00 (2006.01) B29C 33/06 (2006.01) B29C 33/40 (2006.01) B29C 33/42 (2006.01) B29C 33/44 (2006.01) B29C 35/08 (2006.01) B29C 39/02 (2006.01) B29C 39/40 (2006.01) B29C 43/38 (2006.01) C08F 8/30 (2006.01) C08F 16/06 (2006.01) C08F 216/06 (2006.01) C08J 3/24 (2006.01) C08J 3/28 (2006.01) C08J 5/00 (2006.01) C08L 29/04 (2006.01) G02B 1/04 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2128158

A measured amount of a material that is crosslinkable by impingement of a suitable form of energy, especially UV light (3), is introduced into a two-part mould (1) of which the cavity (15) determines the shape of a moulding (CL) to be produced. The two mould halves (11, 12) are held a small distance from one another so that a thin annular gap (16) is formed between them, which gap is in communication with the mould cavity (15) and through which gap excess material can escape. The crosslinking is triggered by impingement of the selected form of energy, the impingement being spatially restricted to the cavity (15) by suitable moulding (21) so that material disposed outside the mould cavity is not crosslinked. In that manner mouldings are obtained that do not require subsequent mechanical processing, and the mould is reusable. The process is especially, but not, however, exclusively, suitable for the manufacture of contact lenses.

Une quantité mesurée de matière réticulable sous l'action d'une forme appropriée d'énergie, en particulier des rayons ultraviolets (3), est introduite dans un moule en deux parties (1) dont la cavité (15) détermine la forme du moulage (CL) à produire. Les deux moitiés du moule (11, 12) sont maintenues légèrement écartées de manière à ménager entre elles un faible espace annulaire (16) communiquant avec la cavité (15) du moule et permettant l'évacuation de l'excès de matière. La réticulation est provoquée par l'application de la forme appropriée d'énergie, celle-ci étant restreinte à l'espace défini par la cavité grâce à un moulage approprié (21), de sorte que la matière en dehors de la cavité du moule n'est pas réticulée. On obtient ainsi des moulages qui ne nécessitent aucun traitement mécanique ultérieur, et le moule est réutilisable. Ce procédé convient particulièrement à la fabrication de lentilles cornéennes mais n'est pas limité à cette application.

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