Patent ID: 7862864
Filing Date: 2011-01-04
Classification: B05C,B05D,G03F

Abstract:
1. A bar coating method comprising the step of: weighing and applying a coating liquid by the bar with bringing the bar into contact with a continuously running web and supplying the coating liquid to an feed side of the web with respect to the bar to form a coating liquid puddle, wherein a plurality of coating liquids are supplied to the feed side of the web with respect to the bar via a plurality of slits formed in a multistage form in an feed direction of the web; and wherein a coating liquid supplied to the upstream slit on the feed side of the web, of the plurality of slits formed in a multistage form has a solvent composition the main component of which is a solvent having a highest surface tension of solvents contained in a coating film forming solvent; and wherein the coating liquids fed from the plurality of slits comprise a common solvent, and the viscosity of the coating liquid is varied for each slit on an upstream side of the bar; and further comprising feeding solution to the web on a downstream side of the bar, said solution fed on the downstream side of the bar comprising the common solvent mixed to a higher viscosity than coating liquids fed on the upstream side.