A refiner segment for refining lignocellulosic material, has a surface including a plurality of bars extending along a direction between an inner periphery of the refiner segment and an outer periphery of the refiner segment, and a plurality of dams, each of the plurality of dams extending between a corresponding pair of adjacent bars among the plurality of bars, wherein at least one of the plurality of dams is a three-dimensionally extending body including three sides, the three-dimensionally extending body extends between the corresponding pair of adjacent bars and includes a curved side, forming one of the three sides, facing the inner periphery of the refiner segment, the curved side having a concave curvature with regard to the inner periphery to thereby form a rounded section in an area defined by the at least one of the plurality of dams and the corresponding pair of adjacent bars.

A refiner segment for refining lignocellulosic material, has a surface including a plurality of bars extending along a direction between an inner periphery of the refiner segment and an outer periphery of the refiner segment, and a plurality of dams, each of the plurality of dams extending between a corresponding pair of adjacent bars among the plurality of bars, wherein at least one of the plurality of dams is a three-dimensionally extending body including three sides, the three-dimensionally extending body extends between the corresponding pair of adjacent bars and includes a curved side, forming one of the three sides, facing the inner periphery of the refiner segment, the curved side having a concave curvature with regard to the inner periphery to thereby form a rounded section in an area defined by the at least one of the plurality of dams and the corresponding pair of adjacent bars.

Disclosed is a refiner filling piece for a refiner having a rotor that rotates about an axis of rotation and cooperates with a stator to mechanically treat a pulp containing cellulosic fibers. The refiner filling piece is mountable to the rotor or the stator. The refiner filling piece comprises a base and a plurality of spaced-apart refiner bars, each refiner bar being defined by a bar length and a bar height. At least some of the refiner bars have a surface coated with a variable coating. The surface having the variable coating may be the leading surface of the bar.

Disclosed is a refiner filling piece for a refiner having a rotor that rotates about an axis of rotation and cooperates with a stator to mechanically treat a pulp containing cellulosic fibers. The refiner filling piece is mountable to the rotor or the stator. The refiner filling piece comprises a base and a plurality of spaced-apart refiner bars, each refiner bar being defined by a bar length and a bar height. At least some of the refiner bars have a surface coated with a variable coating. The surface having the variable coating may be the leading surface of the bar.

A blade element (1) for a refiner for refining fibrous material comprises a refining surface (3) provided with blade bars (8, 10) and blade grooves (9, 11) there-between. The blade bars (8, 10) have side walls (8, 8) facing away from one another. The side walls (8, 8) of the at least one blade bar (8) comprise on both of its side walls (8, 8) steps (14, 14) which extend at least partly in the transversal direction relative to the side walls (8, 8) of the blade bar (8) and away from one another.

A blade element (1) for a refiner for refining fibrous material comprises a refining surface (3) provided with blade bars (8, 10) and blade grooves (9, 11) there-between. The blade bars (8, 10) have side walls (8, 8) facing away from one another. The side walls (8, 8) of the at least one blade bar (8) comprise on both of its side walls (8, 8) steps (14, 14) which extend at least partly in the transversal direction relative to the side walls (8, 8) of the blade bar (8) and away from one another.

Disclosed is a refiner segment (1) that is adapted to be attached to a refining disc (30) of a refiner (100) of lignocellulosic material. The refiner segment (1) comprises a number N, N2, of bars (10) and a number, M2, of dams (11), said bars (10) and dams (11, 11*) being arranged in a pattern whereby essentially box shaped regions (20) are created in areas defined by neighboring bars (10, 10*) and at least two dams (11, 11*) extending between said neighboring bars (10, 10*) at different locations along the length direction of the bars (10, 10*), wherein at least one of the bars (10, 0*) that defines such an essentially box shaped region (20) comprises a bar weakening section (12), arranged within said essentially box shaped region (20), and provided to enable steam trapped in said essentially box shaped region (20) to escape said essentially box shaped region (20) via said bar weakening section (12). Disclosed is also a refiner disc provided with such a refiner segment and a refiner comprising such a refiner segment.

Disclosed is a refiner segment (1) that is adapted to be attached to a refining disc (30) of a refiner (100) of lignocellulosic material. The refiner segment (1) comprises a number N, N2, of bars (10) and a number, M2, of dams (11), said bars (10) and dams (11, 11*) being arranged in a pattern whereby essentially box shaped regions (20) are created in areas defined by neighboring bars (10, 10*) and at least two dams (11, 11*) extending between said neighboring bars (10, 10*) at different locations along the length direction of the bars (10, 10*), wherein at least one of the bars (10, 0*) that defines such an essentially box shaped region (20) comprises a bar weakening section (12), arranged within said essentially box shaped region (20), and provided to enable steam trapped in said essentially box shaped region (20) to escape said essentially box shaped region (20) via said bar weakening section (12). Disclosed is also a refiner disc provided with such a refiner segment and a refiner comprising such a refiner segment.

This disclosure relates to an apparatus for a counter-rotating mechanical refiner configured to mitigate the problems of feeding variations, load variations, high energy consumption due to poor feeding efficiency, low pulp quality, and reduced throughput capacity by positioning a flinger proximate to a rotor gap side of a first rotor, wherein the first rotor further comprises an inlet extending through the first rotor, such that a portion of the operational flinger deflects feed material from the inlet into the refiner gap while rotating in the direction of the first rotor.

This disclosure relates to an apparatus for a counter-rotating mechanical refiner configured to mitigate the problems of feeding variations, load variations, high energy consumption due to poor feeding efficiency, low pulp quality, and reduced throughput capacity by positioning a flinger proximate to a rotor gap side of a first rotor, wherein the first rotor further comprises an inlet extending through the first rotor, such that a portion of the operational flinger deflects feed material from the inlet into the refiner gap while rotating in the direction of the first rotor.