A REFINING SURFACE FOR A REFINER FOR DEFIBERING MATERIAL CONTAINING LIGNOCELLULOSE

摘要

The invention relates to a refining surface in a refiner for defibering material containing lignocellulose, which refiner has two coaxially rotating refining surfaces. The material being defibered is fed between the refining surfaces that both have grooves and bars. According to the invention, at least some of the refining surfaces have on their outer surface a bevel that becomes lower starting from the incoming direction of the bars of the other refining surface so that when the refining surfaces rotate relative to each other, a force that pushes the refining surfaces away from each other is created between them.