High Shear Anilox Cell Discharge Mechanics in Flexographic Aqueous Dispersion Application
Liquid release from anilox cells under high shear depends on dynamic viscosity below forty centipoise and cell depth ratios under thirty percent.
Chromium Oxide Plasma Spray
Ceramic Shielding
High temperature thermal deposition of ceramic particles creates a wear resistant surface on gravure cylinders and anilox rolls. Applying a chromium oxide plasma spray ensures that the underlying steel or aluminum core survives the abrasive friction of doctor blades during long print runs. This coating forms a dense and chemically inert layer that resists the corrosive components found in certain water based inks.
The resulting surface provides the hardness necessary for precision laser engraving.
Application Technique
Ionized gas generates an intense heat source that melts the ceramic powder before it strikes the rotating cylinder. The chromium oxide plasma spray builds up in thin and overlapping layers to create a uniform thickness across the entire face of the roll. Cooling rates must be managed to prevent internal stresses that could lead to delamination.
Surface Performance
Porosity levels in the finished ceramic determine how well the surface holds a laser charge for cell formation. A successful chromium oxide plasma spray provides a base that accepts fine detail without micro cracking. The extreme hardness of the material extends the life of the roll by several million revolutions compared to chrome plating.
Wear usually appears as a loss of cell volume rather than a sudden failure of the coating itself. Maintenance involves periodic cleaning to remove dried ink from the microscopic pores.