Galvanized sheet surface roughness mainly affects coating adhesion and other properties, for different purposes, different requirements for roughness. Car shell with the surface of galvanized sheet requires a higher roughness, the general requirements to Ra1.5μm, as color-coated, appliance panels products requiring low levels of roughness, the general requirements to Ra1.5μm.
Stable operation of the light machine, the galvanized sheet surface roughness depends mainly on light machine work roll roughness, generally to the work roll surface roughness of around 60%. In the new work roll into use later, with time, the roll surface roughness due to wear and reduced production in the arrangements which can require a higher roughness of the first production, when worn to a certain extent reproduction roughness lower number of products.
Work roll surface roughness is generally appropriate by sandblasting, corrosion, electrical and other methods to get engraved.
