Flows in forward deformable roll coating gaps: comparison between spring and plane-strain models of roll cover

摘要

Roll coating is distinguished by the use of one or more gaps between rotating cylinders to meter a continuous liquid layer and to apply it to a continuous flexible substrate. Of the two rolls that make a forward-roll coating agp, one is often covered by a layer of deformable elastomer. Thin films can be obtained without the risk of clashing two hard rolls. Liquid carried into the converging side of the gap can develop high enough pressure to deform the resilient cover, which changes the gap geometry and thus alters the velocity and pressure fields.