Deformable roll coating flows: steady state and linear perturbation analysis
Abstract
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 or reverse roll coating gap, one is often covered by a layer of more-or-less deformable elastomer. Liquid carried into the converging side of the nip can develop high enough pressure to deform the resilient cover, which changes the nip profile and thus alters the velocity and pressure field. This elastohydrodynamic coupled action is not yet well understood. Theoretical modelling has to take into account the viscous flow, the roll deformation and the free-surface effects in order to predict the flow behaviour.
- Publication:
-
Journal of Fluid Mechanics
- Pub Date:
- May 1997
- DOI:
- 10.1017/S0022112097005090
- Bibcode:
- 1997JFM...339..143C