Slide-bead coating technique
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn T. Chandler
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Abstract
A slide-bead coating technique utilizes an inclined slide surface terminating at a coating lip. A continuous liquid layer is supplied to the slide surface from a supply source so as to form a liquid bridge between the coating lip and a substrate disposed adjacent the coating lip. The substrate is conveyed past the lip and continuously depletes liquid from the liquid bridge onto the substrate. The technique includes supplying an air flow that impinges upon an upper surface of the liquid layer opposite the slide surface between the liquid supply source and the coating lip.
Claims5
In a slide-bead coating apparatus having an included slide surface terminating at a coating lip and means for supplying a continuous liquid layer to said slide surface so as to form a liquid bridge between said coating lip and a substrate disposed adjacent said coating lip, said substrate adapted to be conveyed past said lip whereby said substrate continuously depletes liquid from said bridge onto said substrate, the improvement comprising means for supplying an air flow pulse that impinges upon an upper surface of said liquid layer opposite said slide surface between said liquid layer supply means and said coating lip, said pulse of air being sufficient to create a thicker wave region in said liquid layer.
Dependencies are inferred from the claim text.