Methods for controlling and enhancing the quality of base materials employed for the production of semi-finished ophthalmic lenses
The invention discloses methods for controlling and enhancing the quality of base materials employed for the production of semi-finished ophthalmic lenses. Optical qualities of a production lot of base material used in the fabrication of semi-finished lenses may be accurately determined by employing...
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Main Authors | , , |
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Format | Patent |
Language | Chinese English |
Published |
22.12.2010
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Subjects | |
Online Access | Get full text |
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Summary: | The invention discloses methods for controlling and enhancing the quality of base materials employed for the production of semi-finished ophthalmic lenses. Optical qualities of a production lot of base material used in the fabrication of semi-finished lenses may be accurately determined by employing chipper plate samples produced from the base material in accordance with aspects of the present invention. In various implementations of the present invention, the chipper plates samples may be fabricated by subjecting base material to an extended cycle time and temperature profile using a mold having cavities of different thicknesses. The resulting chipper plates provide an improved indication of the color of semi-finished lenses molded from the production lot as well as an improved indication of resin stabilizer defects that may be utilized during a pelletizing process to control and enhance the quality of a production lot. Furthermore, the chipper plates may be provided by suppliers as samples of a production l |
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Bibliography: | Application Number: CN20101250942 |