Method to improve dip coating
AssigneeXerox Corporation
InventorsJian Cai, Huoy-Jen Yuh, Merlin E. Scharfe, Robert F. Dunham
Life of this patent
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Abstract
A method for improving the quality of a dip coated layer that is deposited by flowing a solution along a substrate in a gap between the substrate and a wall, including: (a) determining a yield stress, a viscosity, a density, and a surface tension of the solution, and selecting a wet thickness of the coated layer; (b) determining a coating speed based on the determined viscosity, the determined density, the determined surface tension of the solution, and the selected wet layer thickness; and (c) selecting a distance for the gap and calculating the shear stress of the solution in the gap based on the gap distance, wherein the shear stress is greater than the yield stress.
Claims8
A method for improving the quality of a dip coated layer that is deposited by flowing a solution along a substrate in a gap between the substrate and a wall, comprising:
- (a) determining a yield stress, a viscosity, and a density of the solution, and selecting a wet thickness of the coated layer;
- (b) determining a coating speed U according to the equation:
- h = c 1 μ U ρ g
- where μ is the determined viscosity, ρ is the determined density, h is the selected wet layer thickness, g is the gravitational acceleration, and c1 is a proportionality constant;
- (c) selecting a distance for the gap, which is the distance between the substrate and the wall, and calculating the shear stress of the solution in the gap based on the selected gap distance and the determined coating speed, wherein the shear stress is greater than the yield stress;
- and
- (d) flowing the solution along the substrate in the gap between the substrate and the wall at the selected gap distance and at the determined coating speed to form the dip coated layer.
Dependencies are inferred from the claim text.