The wear and corrosion problems:

The increase in printed materials and the use of a wide range of inks—some of which are highly acidic—have intensified wear and corrosion challenges. High-speed printing equipment demands tighter mechanical tolerances and durable surface coatings to extend the lifespan of components. Protective coatings are applied to paper-contact parts like rollers and doctor bars to minimize wear caused by these demanding conditions.

Specific applications are described as follows:

Engraver Rolls

Traditionally, engraver rolls use fine etchings to help ink adhere and transfer to paper. However, ceramic-coated rolls created through plasma spraying are gaining popularity. These ceramic surfaces are more durable, have a larger surface area for better ink adhesion, and offer superior resistance to corrosion.

Plate and Blanket Cylinders

Commonly used in web presses, these components are exposed to corrosive inks. With modern inks becoming increasingly acidic, there’s a growing need for coatings that deliver higher corrosion resistance.

Draw Rolls

These rolls, often textured and made from hardened steel, grip and guide paper through the press. Grit blasting gives them the required surface texture, but over time, they can wear down, corrode, and lose dimensional accuracy—making periodic restoration and recoating essential.