Non-Newtonian Liquid Blade Coating Process

A blade coating process for non-Newtonian liquids is presented using different air pressure applied at the inlet and the exit of the coating gap. The system consists of a coating blade to form a gap and a vacuum box to create different air pressures to permit coating a thin liquid film on an advancing plastic web. The solution consists of matching the boundary conditions of each subregion of the coating process. The calculated liquid film thickness as a function of the coating gap and applied air pressure difference agrees closely with experimental data obtained on a laboratory coating device.