Method for molding ophthalmic lenses

Details Method for molding ophthalmic lenses Method for molding ophthalmic lenses

1980-02-22

1982-12-21

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...

264327, 2643287, 425808, B29D 1100

Patent

active

043648789

ABSTRACT:
A method of and apparatus for molding precisely shaped articles and particularly high minus precision lenses in which a charge of synthetic resin approximating the mass of the finished article is injected under relatively low pressure into a space, having a volume greater than that of the finished article, between optically finished, heated, relatively movable mold inserts. After injection the inserts are moved toward each other under pressure and controlling the cooling of the mass while under pressure to provide uniformly timed solidification of all parts of the mass thus to form the article without the necessity of either high injection pressure or overflow from the mold cavity.

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