Method of molding plastic contact lenses

Details Method of molding plastic contact lenses Method of molding plastic contact lenses

1982-08-09

1984-09-04

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Changing mold size or shape during molding or with shrinkage...

264 11, B29D 1100

Patent

active

044696469

ABSTRACT:
Plastic contact lenses are formed in a casting process in which the required amount of lens-forming material is charged into a mold half, the mating lens half is inserted but only far enough to contact at least the surface of the lens-forming material. Next the inserted part is allowed to dwell or is slowly withdrawn for a sufficient distance to cause the liquid lens-forming material to move to the center of the two molding surfaces and to approximate a column between the two molding surfaces. The moveable mold portion is then quickly inserted into the mold pushing the lens-forming material uniformly outwardly and displacing any air between the two molding surfaces to form a contact lens devoid of air bubbles and entrained air.

REFERENCES:
patent: 3056166 (1962-10-01), Weinberg
patent: 3761208 (1973-09-01), Boudet et al.
patent: 4008031 (1977-02-01), Weber
patent: 4208364 (1980-06-01), Shepherd
patent: 4284591 (1981-08-01), Neefe
patent: 4364878 (1982-12-01), LaLiberte

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