ロール塗布における基板とロール間塗布液膜流の解析

抄録

A liquid film flow field on a roll coater consists of the upstream bank and film split region. In this paper, the behavior of a liquid film flow inside the upstream bank is analyzed. An approximate formula and numerical simulation including the effect of surface tension are used. A two-dimensional finite volume method is adapted for the numerical simulation. The marker and cell method is used in order to calculate the free surface of the liquid film. Velocity and pressure distributions are shown. Two counter-rotating eddies exist in the upstream bank between the substrate and roll. The pressure gradient inside the liquid film depends on the size of the upstream bank. The surface tension around the upstream bank decreases the pressure gradient. The relationship between the size of the upstream bank and coating film thickness is made clear.