A center plate for a rotor in a pulp refiner has a surface provided with at least one feeding wing for directing lignocellulose-containing material towards a periphery of the center plate. The at least one feeding wing is an elongated protrusion arranged such that its second end is arranged further away from a center of the center plate than a first end and is also displaced relative to the first end in a direction opposite to a direction of rotation of the rotor. The at least one feeding wing includes at least one opening allowing steam to flow through the opening in a direction having a component directed opposite to the direction of rotation.

A center plate for a rotor in a pulp refiner has a surface provided with at least one feeding wing for directing lignocellulose-containing material towards a periphery of the center plate. The at least one feeding wing is an elongated protrusion arranged such that its second end is arranged further away from a center of the center plate than a first end and is also displaced relative to the first end in a direction opposite to a direction of rotation of the rotor. The at least one feeding wing includes at least one opening allowing steam to flow through the opening in a direction having a component directed opposite to the direction of rotation.

A refiner is disclosed comprising relatively rotatable inner and outer conical refining blades. The refining blades are coaxially arranged around a symmetry axis and are provided with first bars and second bars, respectively, for the grinding of fibrous material. The inner conical refining blade or any of the first bars of the inner conical refining blade extend further along the symmetry axis, in the direction of the tapering of the inner and outer conical refining blades, than the outer conical refining blade or any of the second bars of the counter conical refining blade.

A refiner is disclosed comprising relatively rotatable inner and outer conical refining blades. The refining blades are coaxially arranged around a symmetry axis and are provided with first bars and second bars, respectively, for the grinding of fibrous material. The inner conical refining blade or any of the first bars of the inner conical refining blade extend further along the symmetry axis, in the direction of the tapering of the inner and outer conical refining blades, than the outer conical refining blade or any of the second bars of the counter conical refining blade.

The problem of increased energy usage in refiners over the working life of a refining assembly is mitigated by the use of a refiner plate segment having a refiner side and a back side distally disposed from the refiner side, refiner bars engaged to a substrate of the refiner side, wherein the refiner bars have a refiner bar height, and wherein adjacent refiner bars and the substrate define grooves between the adjacent bars, and protrusions disposed in the grooves, wherein the protrusions have a protrusion height, wherein the protrusion height is 30% or less of the refiner bar height.

The problem of increased energy usage in refiners over the working life of a refining assembly is mitigated by the use of a refiner plate segment having a refiner side and a back side distally disposed from the refiner side, refiner bars engaged to a substrate of the refiner side, wherein the refiner bars have a refiner bar height, and wherein adjacent refiner bars and the substrate define grooves between the adjacent bars, and protrusions disposed in the grooves, wherein the protrusions have a protrusion height, wherein the protrusion height is 30% or less of the refiner bar height.

A pulverizing device for pulverizing a base material, e.g. pellets, having a predetermined shape and size, for use in an asphalt mixture. The pulverizing device includes a pulverizing member and a pulverizing surface arranged in a housing, the pulverizing member and the pulverizing surface being arranged such that the base material is adapted to be pulverized between the pulverizing member and the pulverizing surface. The housing at least partly encloses the pulverizing member and the pulverizing surface. The pulverizing surface extends essentially along a longitudinal axis, and the pulverizing member includes a plurality of planar circular cutting discs, adapted to pulverize the base material. The cutting discs are provided with a planar surface, and the cutting discs are arranged along the longitudinal axis, such that the planar surfaces of the cutting discs are oriented essentially parallel to each other.

A pulverizing device for pulverizing a base material, e.g. pellets, having a predetermined shape and size, for use in an asphalt mixture. The pulverizing device includes a pulverizing member and a pulverizing surface arranged in a housing, the pulverizing member and the pulverizing surface being arranged such that the base material is adapted to be pulverized between the pulverizing member and the pulverizing surface. The housing at least partly encloses the pulverizing member and the pulverizing surface. The pulverizing surface extends essentially along a longitudinal axis, and the pulverizing member includes a plurality of planar circular cutting discs, adapted to pulverize the base material. The cutting discs are provided with a planar surface, and the cutting discs are arranged along the longitudinal axis, such that the planar surfaces of the cutting discs are oriented essentially parallel to each other.

A blade element (11) for a refiner (10) for refining fibrous material has a blade element body (12) and blade bars (13, 13a, 13b) and blade grooves (14, 14a, 14b) therebetween. Bottoms of the blade grooves (14, 14a, 14b) have, in the longitudinal direction (LD) of the blade grooves, a variable depth profile comprising alternating high points (14a, 14b) and low points (14a, 14b) so that there is a phase shift (X2) between the high points (14a, 14b) and the low points (14a, 14b) of the variable depth profiles of the bottoms of the adjacent blade grooves (14a, 14b). Also, a refiner (10) for refining fibrous material and a method for manufacturing the blade element (11) for the refiner (1).

A blade element (11) for a refiner (10) for refining fibrous material has a blade element body (12) and blade bars (13, 13a, 13b) and blade grooves (14, 14a, 14b) therebetween. Bottoms of the blade grooves (14, 14a, 14b) have, in the longitudinal direction (LD) of the blade grooves, a variable depth profile comprising alternating high points (14a, 14b) and low points (14a, 14b) so that there is a phase shift (X2) between the high points (14a, 14b) and the low points (14a, 14b) of the variable depth profiles of the bottoms of the adjacent blade grooves (14a, 14b). Also, a refiner (10) for refining fibrous material and a method for manufacturing the blade element (11) for the refiner (1).