Effect of rheology in film formation flows (slot coating)
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초록
내용
Slot coating is a high-precision liquid coating method that effectively deposits thin liquid films onto a moving substrate. The coating layer is formed from the free-surface flows that started from the liquid bridge, called the coating bead, between the moving substrate and the stationary coating die. Therefore, the stability of the corresponding film formation flow, or so-called coating flow, is strongly affected by the force balance inside the coating bead. Here, the rheological properties of the coating liquid are important in determining desired or optimal operating conditions and die design through the force balance. In this study, we will show a systematic investigation of the impact of yield stress and shear thinning behavior on the gas-liquid interface of the film formation flow and the flow through the narrow channel, typically the size of 100 microns, in the slot coating.