Abstract
Simple and complete analyses of Newtonian hydrodynamics in a blade coating system are presented in this paper. The coating behavior of the liquid after it has been pumped to the blade lip is studied. A moving web which is to be coated through a constant gap is partially wrapped over a coating roller under tension. In the simple analysis, the coated liquid film thickness is a function of coating gap, liquid surface tension, viscosity and density, and web speed. In the complete analysis, the film thickness is a function of 15 variables (10 geometric, 3 liquid and 2 operational). Three possible separation conditions at the exit are examined. The optimization of the coater for minimizing liquid film thickness to coating gap ratio is carried out for all 15 variables. Available experimental data are compared with the analyses.
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