Method of lens casting without using a gasket

Details Method of lens casting without using a gasket Method of lens casting without using a gasket

1999-03-19

2000-08-08

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

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

264 25, 249 82, 249105, 249154, 425808, B29D 1100

Patent

active

060997648

ABSTRACT:
An apparatus and method for casting lens without using a gasket that can be used to form all powers and geometric shapes of lenses. An elastomeric strip is used to wrap around the edges of two molds to form a sleeve-like structure, which in turn cooperates with the molds to form a molding cavity. Moreover, this sleeve-like structure does not crumple or shrink during the lens polymerization process. Instead, it allows the molds to slide axially within it to compensate for any shrinkage that occurs during the lens polymerization process.

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