A refining surface for a refiner intended for defibrating lignocellulose-containing materials, the refiner having at least two refining surfaces 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 define grooves and between them ridges, at least part of the refining surface ridges being formed of at least two different ridge parts connected to each other in such a way that one ridge part is farther ahead in the rotation direction of the refining surface than the other ridge part. Further, at least in some ridge parts, the front wall in the rotation direction of the refining surface is over at least part of its length substantially inclined.
1. A refining surface for a refiner intended for defibrating lignocellulose-containing material, the refiner comprising at least two refining surfaces arranged coaxially relative to each other, at least one of which rotates around a central shaft in a rotation direction, and between which the material to be defibrated is fed, and wherein at least one of the refining surfaces comprises grooves and between them ridges, at least part of the refining surface ridges being formed of at least two different ridge parts each defining a length connected to each other in such a way that one ridge part is farther ahead in the rotation direction of the refining surface than the other ridge part and that at least some ridge parts define a wall relative to the rotation direction of the refining surface which defines an inclination relative to the shaft over at least part of its length, wherein the inclination of the wall of the ridge part changes along at least part of the length of the ridge part in such a way that the inclination of the wall closer to the central shaft of the refining surface is smaller than the inclination of the wall farther off from the central shaft of the refining surface.
2. A refining surface according to claim 1 , wherein the inclination of the wall of the ridge part is between 0.5 and 60 degrees.
3. A refining surface according to claim 1 , wherein the ridge part closer to the central shaft of the refining surface is, at the a connecting point of the ridge parts in the rotation direction of the refining surface farther behind than the ridge part farther off from the central shaft.
4. A refining surface according to claim 1 , wherein the ridge part farther off from the central shaft of the refining surface is, at the connecting point of the ridge parts, in the rotation direction of the refining surface farther behind than the ridge part closer to the central shaft.
5. A refining surface according to claim 1 , wherein the two successive ridge parts define front edges that are continuous when seen from the rotation direction of the refining surface.
6. A refining surface according to claim 1 , wherein the two successive ridge parts define front edges that are staggered relative to each other when seen from the rotation direction of the refining surface.
7. A refining surface according to claim 1 , wherein at least some of the ridge parts are connected to each other, and define an oblique bevel inclined towards the outer edge of the refining surface.
8. A refining surface according to claim 1 , wherein the ridge parts define upper surfaces that are in the same plane.
9. A refining surface according to claim 1 , further comprising at least one dam structure between ridge parts adjacent in the rotation direction of the refining surface, connecting said ridge parts together.