Refiner filling piece having multiple coatings on bars

Abstract

Disclosed is a refiner filling piece for a refiner having a rotor that rotates about an axis of rotation and cooperates with a stator to mechanically treat a pulp containing cellulosic fibers. The refiner filling piece is mountable to the rotor or the stator. The refiner filling piece comprises a base and a plurality of spaced-apart refiner bars, each refiner bar having a leading surface and a trailing surface. At least one of the refiner bars has a leading surface coated with a first coating and a trailing surface coating with a second coating. The first and second coatings have different chemical compositions and/or different physical properties. Alternatively, the first and second coatings may be applied to distinct portions of the same surface.

Dependencies are inferred from the claim text.