CURTAIN COATING METHOD USING EDGE GUIDE FLUID

摘要

A method of curtain coating a substrate with at least one layer of liquid coating material comprising: moving the substrate along a path through a coating zone; providing one or more liquid coating materials in the form of a free-falling curtain which extends transversely to said path and impinges on said moving substrate; laterally guiding said free-falling curtain by edge guide elements; providing an edge guide fluid in contact with the free-falling curtain and the edge guide elements, wherein the edge guide fluid is an elastic liquid having a recoverable shear of at least 2 at a shear rate of 10,000 s -1, as measured by means of a cone-plate rheometer, and comprising an aqueous solution of an organic polymer. ® KIPO & WIPO 2009