Effect of slot-die configurations on coating gap dependence of maximum and minimum wet thicknesses |
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Authors: | Hyungyeol Kwak Jaewook Nam |
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Affiliation: | School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, South Korea |
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Abstract: | The dependence of the maximum and minimum wet thicknesses on the coating gap is derived for the slot-die coating process, under different slot-die configurations. Analytical expressions for the wet thickness and its derivative with respect to the coating gap are obtained using a simple flow model. The results indicate that, as expected, the minimum wet thickness increases linearly with the coating gap; however, the maximum wet thickness demonstrates a counterintuitive trend of decreasing as the coating gap increases, when a specific slot-die configuration is assumed. Moreover, the results are also validated by numerically solving the complete two-dimensional (2D) Navier–Stokes equation. |
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Keywords: | coating gap operating limits slot-die coating slot-die design viscocapillary model wet thickness |
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