Spin and spray coating process for curved surfaces
The present invention relates to a process for producing uniform coatings on circular substrates and the coated substrates produced by the process. In particular, the present invention is directed to an improved spin and spray coating process that optimizes the use of coating materials. More particu...
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Sprache: | eng |
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Zusammenfassung: | The present invention relates to a process for producing uniform coatings on circular substrates and the coated substrates produced by the process. In particular, the present invention is directed to an improved spin and spray coating process that optimizes the use of coating materials. More particularly, the present invention relates to efficiently producing optical elements having uniform coatings or imbibed areas containing photochromic compounds. Further, the coated optical elements meet commercially acceptable "cosmetic" standards for optical coatings applied to optical elements, e.g., lenses.
Described is an process for producing uniform coatings on circular substrates that reduces the amount of coating required. The improved process includes the steps of applying the liquid coating material through a single opening of a dispenser having certain characteristics, in a pattern onto the center of a spinning substrate, and then radially moving the dispenser opening near to the edge of the substrate while maintaining the dispenser opening at a predetermined distance from the substrate surface for substantially the entire radius of the substrate providing uniform coverage. Also described are products produced by the process that are substantially free of cosmetic defects and may be photochromic. |
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