Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1993-08-31
1995-06-06
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
264 406, 425143, 4251744, 425808, B29D 1100
Patent
active
054220467
ABSTRACT:
A method for casting plastic lenses includes a step in which lens forming materials having at least one liquid monomer and at least one photosensitive initiator are injected into a mold. The lens forming materials in the mold are subjected to ultraviolet light. The mold assembly is cooled in a liquid cooling bath. The temperature of the lens forming material within the mold is monitored, and the ultraviolet light is turned off when the temperature reaches a predetermined upper set point temperature. The ultraviolet light is turned on again when the temperature falls to a predetermined lower set point temperature. The process can be performed automatically with a programmable process control, which monitors the temperature, compares the temperature to the predetermined set point temperature, and turns the ultraviolet light on and off according to the results of the comparison.
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Abstract-Mitsubishi Petrochemical Co. Ltd. p. 11.
Abstract-Mitsubishi Gas Chem KK p. 4.
Boryslawski Joseph
Tarshiani Yassin Y.
Essilor of America, Inc.
Vargot Mathieu D.
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