Refiner segment with varying depth profile

Abstract

There is disclosed a refiner segment (10) adapted to be attached to a refiner disc (30) in a refiner (100) of lignocellulosic material, said refiner segment (10) being provided with a plurality of spaced apart bars (20,) extending in a direction from an inner periphery (10a) of said refiner segment (10) towards an outer periphery (10b) of said refiner segment (10), where each pair of adjacent bars (20κ; 20K+I) bounds a corresponding intermediate area (22) on said refiner segment (10). The refiner segment (10) comprises at least one intermediate area (22) that comprises a channel region (23) and a ridge region (24), said channel region (23) connecting at a first side (23b) to said ridge region (24) and extending deeper into said refiner segment (10) than said ridge region (24) in order to create an intermediate area (22) having a cross-section with a varying depth profile. Also disclosed are a refiner disc comprising such refiner segments and a refiner comprising a refiner disc comprising said refiner segments.

Dependencies are inferred from the claim text.