Patent ID: 8028946

Claim:
A refining surface of a refiner stator for a refiner used for defibrating high consistency lignocellulose-containing material, the refining surface comprising; wherein the refining surface has a feed edge arranged to be connected to a source of lignocellulose-containing material of more than 25% consistency, and a discharge edge arranged to discharge lignocellulose-containing material; wherein the feed edge and the discharge edge define a direction toward the discharge edge which extends from the feed edge to the discharge edge; wherein the feed edge and the discharge edge define a refining surface length between the feed edge and the discharge edge along the refining surface and in the direction toward the discharge edge; wherein the refining surface has portions defining a plurality of blade bars and blade grooves between the bars, the blade bars and blade grooves extending in the direction toward the discharge edge; wherein the blade grooves of the refining surface have portions defining blade groove bottoms; wherein the refining surface has portions defining a plurality of first dams arranged in the blade grooves, the first dams having guiding surfaces which rise upward toward the blade bars from the bottoms of the blade grooves in a direction opposite the direction toward the discharge edge; wherein the first dams are arranged over at most 75% of the refining surface length starting from the feed edge of the refining surface in the direction of the discharge edge of the refining surface, said at most 75% of the refining surface length defining a first portion; wherein the refining surface has portions defining a plurality of second dams arranged in the blade grooves, the second dams having guiding surfaces which rise upward toward the blade bars from the bottoms of the blade grooves in the direction toward the discharge edge; and wherein the second dams are arranged over the refining surface which is not of part of the first portion of the refining surface length.