Implications for coating of static and dynamic wetting

摘要

The static and dynamic wetting of surfaces is central to coating processes. Static wetting controls the extent of spreading on the applicator and substrate, and control of wetting line position is one objective of applicator design. Capillary wicking can cause leakage, and crooked wetting lines can cause coating nonuniformities. In the case of the simultaneous coating of multiple layers, the extent of spreading of one layer upon another must be controlled through the use of surfactants.