Refining Segment
AssigneeValmet Technologies Oy
InventorVille Ruola
Life of this patent
Estimating the term…
Abstract
A refining segment (4) for a refiner (1) for refining lignocellulose-containing fibrous material has an inner end edge (20) and an outer end edge (21) opposite to the inner end edge. A refining surface (5) has refining bars (25) and refining grooves (26) therebetween and at least one recess (27, 27′, 27″) extending from the outer end edge of the refining segment at least partly towards the inner end edge for forming at least partly at least one backflow guide groove (28) extending from the outer end edge of the refining segment at least partly towards the inner end edge. A volume of the at least one recess is arranged to decrease towards the inner end edge for providing the volume of the at least one backflow guide groove to decrease towards the inner end edge.
Claims20
A refining segment for a refiner for refining lignocellulose-containing fibrous material, the refining segment comprising:
- an inner end edge and an outer end edge opposite to the inner end edge (20);
- and
- a refining surface comprising refining bars and refining grooves therebetween;
- wherein the refining surface of the refining segment comprises at least one recess extending from the outer end edge of the refining segment at least partly towards the inner end edge of the refining segment for forming at least partly at least one backflow guide groove extending from the outer end edge of the refining segment at least partly towards the inner end edge of the refining segment, and wherein a volume of the at least one recess is arranged to decrease towards the inner end edge of the refining segment for providing the volume of the at least one backflow guide groove to decrease towards the inner end edge of the refining segment.
A refining segment for a refiner for refining lignocellulose-containing fibrous material, the refining segment comprising:
- an inner end edge and an outer end edge opposite to the inner end edge (20);
- and
- a refining surface comprising refining bars which project from a bottom level of refining grooves positioned between the refining bars;
- and
- portions of the refining surface defining a backflow guide groove which is recessed below the refining bars of the refining surface, wherein the backflow guide groove extends from the outer end edge of the refining segment towards the inner end edge of the refining segment, wherein a cross-sectional area of the backflow guide groove decreases as it extends towards the inner end edge of the refining segment thereby guiding a backflow of fibrous material into a refining gap above the refining surface when the refining segment is positioned opposite another refining segment within a refiner.
Dependencies are inferred from the claim text.