Method of simultaneously applying multiple layers to web

Abstract

A method of simultaneously applying multiple layers of coating liquids to a moving web with a slide hopper type coating apparatus in which the fluidity of a coating liquid for forming the lowermost of multiple layers is improved to thereby eliminate inter-layer mixing and waving. The first coating liquid which forms the lowermost of the multiple layers is prepared so that it, when run at a low shear rate, has a viscosity equal to or different by no more than .+-.10 cp from a viscosity of a second coating liquid for forming a layer next to the lowermost layer when the second coating liquid flows at a low shear rate and that the first coating liquid, when run at a high shear rate, has a viscosity lower than the viscosity of the second coating liquid when the second coating liquid flows at a high shear rate. The first and second liquids are then applied to a moving web with the slide hopper type coating apparatus.

Dependencies are inferred from the claim text.