Bead edge guide for use in slide-bead coating
AssigneeE. I. Du Pont de Nemours and Company
InventorMark D. Franke
Life of this patent
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Abstract
An apparatus for controlling the bead edge in slide-bead coating is dislcosed employing bead edge guides in a gap between a coating lip and a moving substrate. The apparatus provides for improved coating quality and less material loss typically observed with increased line speeds.
Claims9
In a slide bead coating apparatus for coating a moving substrate with a plurality of layers of flowing liquids comprising a drive mechanism for moving said substrate at a desired speed, a coating efflux means having a surface with a coating lip at a terminus of said coating efflux surface, a mechanism for supplying a plurality of said flowing liquids to said coating efflux surface and said coating lip allowing the plurality of liquids to traverse a gap between said coating lip and said moving substrate, means for applying differential pressure to a top and a bottom of said flowing liquids thereby forming a bead within said gap, edge guides located on edges of said coating efflux surface capable of controlling a width of said flowing liquid on said coating efflux surface wherein the improvement comprises a bead edge guide positioned in the gap between said coating lip and said moving substrate with the edge guides contacting only a lateral edge portion of the flowing liquids traversing the gap prior to coating the moving substrate.
Dependencies are inferred from the claim text.