Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Changing mold size or shape during molding or with shrinkage...
Patent
1983-10-11
1985-09-10
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Changing mold size or shape during molding or with shrinkage...
249 82, 2643287, 2643289, 26432812, 425352, 425547, 425555, 425558, 425561, 425562, 425563, 425808, B29D 1100
Patent
active
045405344
ABSTRACT:
An apparatus and method for molding polycarbonate lenses is disclosed in which the lenses are formed in a single injection molding operation. Polycarbonate is injected into a cavity between two movable dies which are forced apart by the injected polycarbonate. These dies are then urged together forcing a portion of the injected polycarbonate back through the same port through which the polycarbonate was injected. The finished lens does not have the knit line normally associated with injection molded lenses.
REFERENCES:
patent: 2166215 (1939-07-01), Lloyd
patent: 2233057 (1941-02-01), Luce
patent: 2319014 (1943-05-01), Smith
patent: 2333131 (1943-11-01), Tillyer et al.
patent: 2516373 (1950-07-01), Ehlert et al.
patent: 2532501 (1950-12-01), Johnson
patent: 3240854 (1966-03-01), Ewer
patent: 3902693 (1975-09-01), Crandon et al.
patent: 4008031 (1977-02-01), Weber
patent: 4091057 (1978-05-01), Weber
patent: 4184835 (1980-01-01), Talbot
patent: 4254065 (1981-03-01), Ratkowski
patent: 4364878 (1982-12-01), Laliberte
American Optical Corporation
Lowe James
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