Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Reshaping or treatment of an optical preform
Patent
1989-10-13
1992-03-31
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Reshaping or treatment of an optical preform
264 11, 425808, B29D 1100
Patent
active
051005905
ABSTRACT:
In a method of forming an ophthalmic lens from a synthetic material blank, in particular from a polycarbonate material, the blank is placed horizontally in a mold having optically finished molding surfaces. It is then subjected to a molding force at raised temperature in an oven. The mold has an upper molding surface that is part of a shell member adapted to slide freely in a ring. The molding force is limited to the static force due to the weight of the shell member, optionally increased by the weight of a pre-load mass surmounting the shell member.
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Essilor International "Cie Generale d'Optique
Lowe James
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