Molding processes

Details Molding processes Molding processes

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B29C 33/30 (2006.01) B29C 35/08 (2006.01) B29C 39/44 (2006.01) B29C 71/00 (2006.01) G01M 11/02 (2006.01) B29C 33/20 (2006.01) B29C 33/72 (2006.01)

Patent

CA 2282090

Efficient and consistent processes for manufacturing moldings, especially ophthalmic lenses such as contact lenses. The processes comprise a series of improvements, including improvements in the areas of conditions for dispensing liquid prepolymer into lens molds, male and female mold mating, reusable molds, mold cleaning, lens separation from molds (demolding), lens handling, and in-line inspection. Cyclic series of processing steps are also disclosed. Additionally, an improved molding tool is disclosed, with the molding tool including a male mold housing and a female mold housing, each of which has disposed therein a plurality of mold halves.

Procédés fiables et efficaces servant à fabriquer des moulages, en particulier, des lentilles ophtalmiques, telles que des lentilles de contact. Ces procédés présentent une série d'améliorations, y compris des améliorations concernant les conditions de coulage du prépolymère liquide dans des moules de lentilles, l'appariement des parties mâle et femelle du moule, la réutilisation des moules, la séparation des lentilles et des moules (démoulage), la manipulation des lentilles et l'inspection en ligne. L'invention également des séries cycliques d'étapes de traitement. Elle concerne, de plus, un outil de moulage amélioré comprenant une partie de moulage mâle et une partie de moulage femelle dans chacune desquelles est située une pluralité de moitiés de moules.

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