Method for removing excess lens forming material

Details Method for removing excess lens forming material Method for removing excess lens forming material

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B29C 33/00 (2006.01) B29C 33/10 (2006.01) B29C 43/36 (2006.01) B29C 43/38 (2006.01)

Patent

CA 2148241

Process and apparatus for molding the front and rear surfaces of a contact lens in one step is disclosed. Two mold halves (110, 112) matable to form a contact-lens-shapes cavity and a cavity (119) for excess lens forming material surrounding the cavity are provided. The improvement comprises providing the cavity with at least two openings (121, 132, 133) and producing differential gas pressure across the openings to remove excess lens forming material.

Procédé et appareil de moulage en une étape des surfaces antérieure et postérieure d'une lentille de contact. Deux moitiés (110, 112) de moule pouvant être appariées pour former une cavité en forme de lentille de contact sont prévues, ainsi qu'une cavité (119), destinée au surplus de matériau de formation de lentille, entourant la première cavité. Le perfectionnement consiste à pratiquer au moins deux ouvertures (121, 132, 133) dans la cavité et à générer une pression gazeuse différentielle à travers les ouvertures pour enlever le surplus de matériau.

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