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1. (WO2010112667) REFINING SURFACE FOR A REFINER

Pub. No.:    WO/2010/112667    International Application No.:    PCT/FI2010/050200
Publication Date: Fri Oct 08 01:59:59 CEST 2010 International Filing Date: Wed Mar 17 00:59:59 CET 2010
IPC: D21D 1/30
B02C 7/02
Applicants: METSO PAPER, INC.
RUOLA, Ville
HEDLUND, Christer
Inventors: RUOLA, Ville
HEDLUND, Christer
Title: REFINING SURFACE FOR A REFINER
Abstract:
A refining surface (1, 2) of a refiner for a refiner intended for defibrating lignocellulose-containing material. The refining surface has a feed edge (14) directed in the direction of the feed flow of the material to be refined and a discharge edge (15) directed in the direction of the discharge flow of the refined material. The refining surface (1, 2) comprises at least one first blade groove (17a) and at least one second blade groove (17b), between which there is a blade bar (16). A distance (D, D17a, D17b) of the bottom (18) of the first blade groove (17a) and the second blade groove (17b) from an upper surface (16a) of the blade bar (16) is arranged, at least in a part of said blade grooves, to change substantially continuously in a direction of travel (A) of the blade grooves. The distance (D17a) of the bottom of the first blade groove and the distance (D17b) of the bottom (18) of the second blade groove from the upper surface of the blade bar are arranged, in the direction of travel of the blade grooves, in such a way relative to each other that the distance of the bottom of the second blade groove from the upper surface of the blade bar deviates from the distance of the bottom of the first blade groove from the upper surface of the blade bar at substantially the same distance (SD) from the feed edge of the refining surface. Further, a blade segment (11) of a refiner, and a refiner.