Method and apparatus for making an ophthalmic lens

Details Method and apparatus for making an ophthalmic lens Method and apparatus for making an ophthalmic lens

1994-03-11

1995-07-25

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Including plural heating steps

264 85, 264102, 264 37, 264DIG78, 425 73, 425 74, 425215, 425447, 425808, B29D 1100

Patent

active

054359430

ABSTRACT:
A method and apparatus for making an ophthalmic lens pumps monomer into one end of a gas permeable tube along its interior length while a chamber surrounding the gas permeable tube is maintained at a subatmospheric pressure by means of a vacuum pump. Preferably, the gas permeable tube is made of silicon rubber. Static mixers introduce mixing into the flow of the monomer within the tube in order to expose the bulk of the monomer to the gas permeable walls of the tube. Under such conditions in the gas permeable tube, the majority of the dissolved gasses are removed from the monomer and continue to be drawn out of the chamber by the pump connected to the chamber. The degassed monomer is then transferred into a mold where it is polymerized into an ophthalmic lens.

REFERENCES:
patent: 2542386 (1951-02-01), Beattie
patent: 3551541 (1970-12-01), Rossetti
patent: 3621892 (1971-11-01), Gillespie
patent: 3894024 (1975-07-01), Cherenko et al.
patent: 4234533 (1980-11-01), Longlands
patent: 4386039 (1983-05-01), Szycher
patent: 5222118 (1993-06-01), Gerth

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