The essence of forward roll coating is embodied in the flow of liquid between two rigid cylinders rotating in opposite senses, and in the splitting of the liquid into two films downstream of the gap between the cylinders. The metering of the flow rate by the gap region, the film-splitting, and the oft-seen, spontaneous ribbing or patterning of the films are phenomena important to applications in coating operations and printing processes. Those phenomena are analyzed here by means of the lubrication approximation and, more rigorously, by accurate finite element solutions of the equations of motion of viscous liquids, both Newtonian and shear-sensitive.
|Original language||English (US)|
|Number of pages||9|
|Journal||TAPPI Coating Conference|
|State||Published - Dec 1 1985|