Method and apparatus for molding contact lenses and making...

B - Operations – Transporting – 29 – D

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B29D 11/00 (2006.01) B29C 33/36 (2006.01) B29C 39/06 (2006.01) B29C 69/02 (2006.01) B29D 22/00 (2006.01) B65B 9/04 (2006.01) B65B 25/00 (2006.01) B29C 51/08 (2006.01) B29C 51/10 (2006.01)

Patent

CA 2212044

An improved, automated method and apparatus for molding contact lenses generally comprises the steps of: (1) forming anterior (20) and posterior (18) mold cavities in longitudinally spaced relation in first and second webs (10, 12) of material, respectively; (2) dispensing a liquid, curable, lens material (e.g., monomer) in each anterior cavity of the first web; (3) aligning and bringing the posterior and anterior cavities into sequential mating, centered engagement with each other, (4) curing the lens material captured between between respective posterior and anterior molds; and (5) separating the webs to release the lenses (34) cast therebetween. In an advantageous embodiment of the invention, the mold cavities are vacuum-formed in the respective webs, and packaging receptacles (40) are formed in one or both of the webs used to mold the lenses.

Méthode et appareil automatisés et améliorés permettant de mouler des lentilles cornéennes. Le procédé comprend généralement les étapes suivantes : (1) former les empreintes antérieure (20) et postérieure (18) du moule dans une relation longitudinalement espacée et dans deux bandes continues respectives (10, 12) de matériel; (2) remplir chacune des empreintes antérieures de la première bande continue d'un matériau pour lentille (p. ex. un monomère) liquide et apte à subir une cuisson; (3) aligner, centrer et accoupler les empreintes postérieure et antérieure les unes par rapport aux autres; (4) cuire le matériau à lentille se trouvant entre les moules postérieur et antérieur; et (5) séparer les bandes continues afin de retirer les lentilles (34). Dans une version privilégiée avantageuse, les empreintes des moules sont formées sous vide dans les bandes continues respectives, et les contenants de conditionnement (40) des lentilles sont formés dans une ou dans les deux bandes continues ayant servi à mouler les lentilles.

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