A recent research proves that a prediction model for the coating window in high-speed slot die coating with vacuum box is valid for the investigated material systems and coating gap widths over the investigated range of coating speeds up to 500 m/min.

Researchers found that knowing and predicting the coating window of thinnest wet film thicknesses is crucial to design the production process. Source: StockPhotoPro - Adobe.Stock

In the battery industry, very thin primer layers are used to improve electrode adhesion on substrates or act as blocker layers to prevent corrosion in case of aqueous cathodes. For these material configurations, high-speed coating is mandatory to ensure the economic viability of the process. One way to realize high-speed coating is a set-up including a slot die and a vacuum box to stabilize the coating bead. Knowledge and prediction of the coating window of thin wet film thicknesses is crucial to design the production process. Therefore, the influence of coating gap and viscosity of shear-thinning fluids on the coating window is investigated with the help of various model fluids.