Refiner

Abstract

A refining surface for a refiner intended for defibrating lignocellulose-containing material, the refiner comprising at least two refining surfaces (1, 2) arranged coaxially relative to each other, at least one of which rotates around a shaft, and between which the material to be defibrated is fed. The refining surfaces (1, 2) comprise grooves and between them ridges (11), at least part of the refining surface (1, 2) ridges (11) being formed of at least two different ridge parts (11a, 11b) connected to each other in such a way that one ridge part (11a, 11b) is farther ahead in the rotation direction of the refining surface (1, 2) than the other ridge part (11a, 11b). Further, at least in some ridge parts (11a, 11b), the front wall (14) in the rotation direction (A) of the refining surface (1, 2) is over at least part of its length substantially inclined.

Description

field of invention [0001] The present invention relates to a refining surface for a refiner for dissociating material containing wood fibers, the refiner comprising at least two refining surfaces arranged coaxially with each other, at least one of which surrounds Rotating on one axis, the material to be dissociated is fed between the two refining surfaces, the refining surface has grooves and ridges between the grooves, at least part of the ridges of the refining surface is formed by at least two different The ridges are formed such that one of the ridges is far in front of the other in the direction of rotation of the refining surface. Background technique [0002] Disc and conical refiners for the manufacture of mechanical pulp are formed by two opposite discs which rotate relative to each other and which one or both discs rotate. In a disc refiner the disc is in the shape of a disc and in a conical refiner the disc is in the shape of a cone. The refining surface of the ...

AI Technical Summary

Problems solved by technology

In practice, however, the number of dams has to be limited, because the more dams there are in the refining segment, the more difficult it is for water in the refining gap and steam generated during the refining process due to the high power introduced into the grinding discs to escape from the refining gap , thus reducing the production capacity of the refiner

Furthermore, the vapor pressure generates very large axial forces between the refining segments, especially outside their perimeter, which load the refiner bearings and thus limit the refiner's operating forces

High vapor pressure also induces bending of the refining segments such that the segments lose parallelism

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