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.

A refiner segment for a refiner comprising refining zones provided with a pattern of bars arranged at a respective pumping feeding angle within a respective refining zone, and intermediate grooves between the bars, and dams extending between the bars and protruding above the surface of the grooves. The dams are arranged at least at the ends of at least some of the bars at the borders between the refining zones. Openings are formed at the borders between the refining zones, radially outside of the dams, where the openings are arranged such that a respective angle is formed between an imaginary line connecting the openings and a line which is perpendicular to a radius of the refiner segment, where the angle is directed towards the inner edge of the refiner segment, thereby allowing steam to pass through the openings and flow towards an inner edge of the 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.

A hub and a member, the member having a central opening. The hub is received in the member central opening. The hub has a center, and a hub axis through the center. The hub also has a splined exterior with a plurality of splines, each spline having a spline surface, and the member central opening has internal splines that engage with the hub splined exterior. At least one of the hub splines has a wear indicator, the wear indicator comprising a surface mark that extends along a portion of the spline surface in the same direction as the hub axis.

A refining member for a pulp refiner comprising a refining body with a refining surface comprising refiner bars separated by refiner grooves and teeth. Each of the refiner bars extend from a radially inward position on the refining surface to a first radially outward position on the refining surface, and the teeth extend to a second radially outward position on the refining surface. The second radially outward position is nearer to an outermost part of the refining body than the first radially outward position. The refiner bars are adapted to refine wood fibers, and the teeth are adapted to break up fiber bundles.

There is disclosed a refiner segment (10) for a refiner (1) of lignocellulosic material. The refiner segment (10) is part of a refiner disc (100) that comprises a center area (11). The refiner segment (10) comprises a number H, N2, of bar zones (Z.sub.i,i=1, 2, . . . N) that are arranged at different radial positions with regard to a radial direction R extending from the center area (11) of the refiner disc (100)_towards the periphery of the refiner segment (10). Each of the bar zones (Z.sub.i) are defined by a corresponding set of refining bars (Z.sub.i.sup.RBi, i=1, 2, . . . M) that are distributed angularly and encircles the center area (11). The refining bars (Z.sub.i.sup.RBi) belonging to different but neighboring bar zones (Z.sub.i, Z.sub.i+1) are angularly offset and refining bars (Z.sub.i.sup.RBi) belonging to different but neighboring bar zones are arranged in such a way that a tangential direction of a particular refining bar (Z.sub.k.sup.RBk) belonging to a bar zone (Z.sub.i,) points in a direction towards the mid-point between two refining bars (Z.sub.k+1.sup.RBk+1) belonging to a neighboring bar zone (Z.sub.i, Z.sub.i+1) and wherein the length of refining bars belonging to different bar zones decreases from a largest length for refining bars (Z.sub.i.sup.RBi) belonging to the innermost bar zone (Z.sub.1), with regard to the center (11) of said refining disc (100), to the smallest length for refining bars (Z.sub.N.sup.RBN) belonging to the outermost bar zone (Z.sub.N) adjacent the periphery of said refiner segment (10). There is also disclosed a rotor disc comprising such a refining segment, a stator disc adapted to cooperate with such a rotor disc as well as a refiner comprising at least one of such a rotor disc and stator disc.

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. The 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 also is displaced relative to the first end in a direction opposite to a direction of rotation of the rotor. The center plate is also provided with at least one counter-feeding wing for directing steam flowing along the surface towards the center of the center plate. The counter-feeding wing is an elongated protrusion arranged such that a second end of the counter-feeding wing is arranged further away from the center of the center plate than a first end and closer to the center of the center plate than the first end.

A hub and a member, the member having a central opening. The hub is received in the member central opening. The hub has a center, and a hub axis through the center. The hub also has a splined exterior with a plurality of splines, each spline having a spline surface, and the member central opening has internal splines that engage with the hub splined exterior. At least one of the hub splines has a wear indicator, the wear indicator comprising a surface mark that extends along a portion of the spline surface in the same direction as the hub axis.

The present invention concerns a granular material conditioner for optimising grain sizes of granular materials comprising two discs which are rotatable relative to each other and which are arranged in substantially mutually parallel relationship, a granular material inlet through which granular material can be passed into the conditioner into an annular gap between the two discs, and a catch container for receiving the granular material which issues from the gap between the two discs by virtue of centrifugal force. According to the invention it is proposed that the catch container has an elastic curtain, wherein the curtain is spaced at least portion-wise from the catch container wall and limits the trajectory of the granular material issuing from the gap.

A refiner segment configured to be attached to a refiner disc in a refiner of lignocellulosic material includes: a plurality of bars extending in a direction from an inner periphery of the refiner segment towards an outer periphery of the refiner segment; a plurality of intermediate areas, each intermediate area disposed between adjacent bars of the plurality of bars and configured to separate each bar from an adjacent bar, wherein at least one of the intermediate areas includes: a channel region having a first side and extending a first depth into the refiner segment, and a ridge region connected to the first side of the channel region and extending a second depth into the refiner segment less than the first depth. The channel region has a width W.sub.1 that gradually decreases in a direction from the outer periphery of the refiner segment toward the inner periphery of the refiner segment, and the ridge region has a width W.sub.2 that correspondingly increases in the direction from the outer periphery of the refiner segment toward the inner periphery of the refiner segment.