Method for coating a thin layer on a substrate having a rough surface
AssigneeKonica Corporation
InventorsAtsushi Saito, Ichiro Miyagawa
Life of this patent
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Abstract
Disclosed is a method of coating a substrate having a center-line average roughness Ra of not less than 0.3 comprising steps of: (a) conveying said substrate, and (b) coating said substrate while conveying said substrate with a coating solution under a coating condition defined by a capillary number Ca represented by Formula 1, wherein said capillary number Ca satisfies an inequality represented by Formula 2: ##STR1## wherein U represents a substrate conveyance speed in terms of cm/sec, .mu. represents a viscosity of said coating solution in terms of dyn-sec/cm.sup.2, and .sigma. represents a surface tension of said coating solution in terms of dyn/cm.
Claims11
A method of extrusion coating or slide coating a substrate comprising
- (a) conveying a substrate having a surface with a center-line average roughness Ra of not less than 0.3 .mu.m, and
- (b) coating said surface during said conveying with a coating solution under conditions satisfying Formula 1 and Formula 2;
- ______________________________________ Formula1 Formula 2 ______________________________________ Ca = .mu. .multidot. U/.sigma. Ca .ltoreq. 0.3 ______________________________________
- wherein Ca is a capillary number, U represents a substrate conveyance speed in cm/sec, .mu. represents a viscosity of said coating solution in dyn-sec/cm.sup.2, and .sigma. is a surface tension of said coating solution in dyn/cm.
Dependencies are inferred from the claim text.