Patent ID: 6458422
Filing Date: 2002-10-01
Classification: B05C,B05D,G03C,Y10S

Abstract:
A method for reducing coating defects caused by strikethrough when simultaneously slide coating at least a first fluid layer, a second fluid layer, and a third fluid layer, the first fluid layer being made of a first fluid which includes a first solute and a first solvent, the second fluid layer being made of a second fluid which includes a second solute and a second solvent, the third fluid layer being made of a third fluid which includes a third solute and a third solvent, the method comprising:preparing the first fluid having a first density; preparing the second fluid, wherein the second fluid has a second density; preparing the third fluid, wherein the third solute is incompatible with the first solute, wherein the third fluid has a third density which is greater than the second density; flowing the first fluid down a first slide surface to create the first fluid layer on the first slide surface, the first slide surface being positioned adjacent a substrate; flowing the second fluid down a second slide surface positioned relative to the first slide surface such that the second fluid flows from the second slide surface to above the first slide surface onto the first fluid layer to create the second fluid layer on the first slide surface, the second fluid layer having a second thickness; flowing the third fluid down a third slide surface positioned relative to the first and second slide surfaces such that the third fluid flows from the third slide surface to above the second slide surface and above the second fluid layer and such that the third fluid flows from above the second slide surface to above the first slide surface to cream the third fluid layer on the first slide surface; and coating the substrate with the first, second, and third fluids; wherein the incompatibility of the third solute with the first solute makes the third fluid susceptible to strikethrough to at least one of the second and first slide surfaces, and wherein the second thickness is sufficient to reduce the strikethrough of the third fluid to at least one of the second and first slide surfaces.