Abstract: A fiber processing system includes a fiber processing unit having an inlet, accepts outlet, and solid discharge outlet and configured to remove solid contaminants from a fiber-containing stream to produce an accepts stream exiting the accepts outlet and a solid discharge stream exiting the solid discharge outlet. The fiber processing system includes an optical system having an imaging device and image processing system. The imaging device is configured to capture images of the solid discharge stream at or downstream of the solid discharge outlet, and the image processing system is configured to determine relative fiber content, a relative generation rate, types of materials in, or combinations thereof of the solid discharge stream from the captured images. The fiber content, generation rate, and/or types of materials of the solid discharge stream are used to control operation of the fiber processing system or other upstream pulp processing equipment.

Abstract: A screen cylinder includes: a plurality of profiled bars aligned longitudinally and coupled to at least one support ring, each of the plurality of profiled bars comprising: an outer surface; a first slot surface extending from the outer surface to the attachment end of the profiled bar opposite the outer surface; a second slot surface opposite the first slot surface and extending from the outer surface to the attachment end of the profiled bar, wherein the first slot surface of one profiled bar and the second slot surface of another immediately adjacent profiled bar define a slot; and a hardened layer disposed on at least a portion of the first slot surface of the profiled bar, wherein the hardened layer is disposed directly on at least a portion of the first slot surface of the profiled bar and the hardened layer is an outer layer.

Abstract: A method of removing solid contaminants from a solid suspension may comprise: contacting the solid suspension with a screen cylinder comprising: a plurality of profiled bars aligned longitudinally, each of the plurality of profiled bars comprising: a first slot surface extending from an outer surface to an attachment end; a second slot surface opposite the first slot surface; and a hardened layer integral with or disposed on at least a portion of the first slot surface, the hardened layer having a Vickers hardness value greater than or equal to 500HV0.05; and; wherein contact of the solid suspension with the screen cylinder causes at least a portion of the solid suspension to pass through the slots; and collecting an acceptable solid suspension from the plurality of slots of the screen cylinder.

Abstract: A screen cylinder includes a profiled bars aligned longitudinally and coupled to at least one support ring. Each of the profiled bars includes an outer surface facing away from the support ring, a first slot surface extending from the outer surface to the attachment end, and a second slot surface opposite the first slot surface and extending from the outer surface to the attachment end of the profiled bar. The first slot surface of one profiled bar and the second slot surface of another immediately adjacent profiled bar define a slot. The profiled bars include a hardened layer integral with or disposed on at least a portion of the first slot surface of the profiled bar. The hardened layer may have a Vickers hardness greater than the hardness of the base metal.

Abstract: A screen cylinder includes a profiled bars aligned longitudinally and coupled to at least one support ring. Each of the profiled bars includes an outer surface facing away from the support ring, a first slot surface extending from the outer surface to the attachment end, and a second slot surface opposite the first slot surface and extending from the outer surface to the attachment end of the profiled bar. The first slot surface of one profiled bar and the second slot surface of another immediately adjacent profiled bar define a slot. The profiled bars include a hardened layer integral with or disposed on at least a portion of the first slot surface of the profiled bar. The hardened layer may have a Vickers hardness greater than the hardness of the base metal.