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: The present invention relates to extraction bedplates 10, 110, 210, 310, 410, 510, 610 for use in apparatus 5 for defiberizing paper making stock and methods for making such bedplates. Preferred methods for making such bedplates 10, 110, 210, 310, 410, 510, 610 include the step of cutting a disc shaped blank from a metal plate and the step of forming holes 45, 145, 245, 345, 445, 545, 645, 646 either the metal plate or the disc shaped blank. The holes 45, 145, 245, 345, 445, 545, 645, 646 preferably are formed using a cutting stream, most preferably either a laser or a water jet. Use of a such a cutting stream to form the holes facilitates the cutting of holes 45, 145, 245, 345, 445, 545, 645, 646 having non-circular, and preferably tesselatory, cross sections as well as holes 45, 145, 245, 345, 445, 545, 645, 646 extending at acute angles with respect to an axis 20 of the bedplate.

Abstract: An improvement to a mechanical refining system relates to an apparatus including three or more actuators (100) coupled to a stator (42) of the refining system, and a controller for independently operating the actuators. An improved method of refining permits adjustment of the overall width of a refining gap between refining elements mounted by the stator and a rotor as well as the trim of the refining elements relative to each other.

Abstract: The present invention relates to extraction bedplates 10, 110, 210, 310, 410, 510, 610 for use in apparatus 5 for defiberizing paper making stock and methods for making such bedplates. Preferred methods for making such bedplates 10, 110, 210, 310, 410, 510, 610 include the step of cutting a disc shaped blank from a metal plate and the step of forming holes 45, 145, 245, 345, 445, 545, 645, 646 either the metal plate or the disc shaped blank. The holes 45, 145, 245, 345, 445, 545, 645, 646 preferably are formed using a cutting stream, most preferably either a laser or a water jet. Use of a such a cutting stream to form the holes facilitates the cutting of holes 45, 145, 245, 345, 445, 545, 645, 646 having non-circular, and preferably tesselatory, cross sections as well as holes 45, 145, 245, 345, 445, 545, 645, 646 extending at acute angles with respect to an axis 20 of the bedplate.

Abstract: The present invention relates to extraction bedplates (10), (110), (210), (310), (410), (510), (610) for use in apparatus (5) for defiberizing paper making stock and methods for making such bedplates. Preferred methods for making such bedplates (10), (110), (210), (310), (410), (510), (610) include the step of cutting a disc shaped blank from a metal plate and the step of forming holes (45), (145), (245), (345), (445), (545), (645), (646) either the metal plate or the disc shaped blank. The holes (45), (145), (245), (345), (445), (545), (645), (646) preferably are formed using a cutting stream, most preferably either a laser or a water jet. Use of a cutting stream to form the holes facilitates the cutting of holes (45), (145), (245), (345), (445), (545), (645), (646) having non-circular, and preferably tesselatory, cross sections as well as holes (45), (145), (245), (345), (445), (545), (645), (646) extending at acute angles with respect to an axis (20) of the bedplate.

Abstract: Method and apparatus for pneumatically drying thickened lime mud and feeding the dried thickened lime mud to a lime reburning kiln. The thickened mud is pneumatically dried via the action of flue gas emanating from the lime reburning kiln. The dried, thickened lime is separated from the flue gas in a cyclone separator. A process loop controller determines the temperature of the separated lime and, in response, controls the feed rate of lime fed to the pneumatic dryer to ensure that the dryer possesses the requisite latent heat needed to dry thickened lime therein. In one embodiment, the feed rate of lime fed to the thickener is adjustably controlled which, in turn, adjustably varies the flow rate of the thickened mud to the dryer.

Abstract: A paper pulp refiner with control system employs active hydrostatic bearings for supporting the refiner rotor, at least in part, the hydrostatic bearings are defined between the refiner rotor plates (25, 55) and stator plates (22, 60) through openings (40, 62, 85) formed in the stator plates for the admission of active hydrostatic fluid. The control fluid flows into the refiner gap under controlled volume and pressure, employing the refining plates as active hydrostatic bearings and flows into the process fluid. Hydrostatic control fluid is used, which is non-contaminated to the process fluid. The rotors of the paper pulp refiners may also be controlled by hydrostatic bearing surfaces formed between relative rotating and non-rotating components, such surfaces having passageways also opening into the process fluid. In the event of loss of control or function, the refiner may continue to operate on the hydrostatic bearings until the control function can be restored.

Abstract: A paper pulp refiner with control system employs active hydrostatic bearings for supporting the refiner rotor, at least in part, the hydrostatic bearings are defined between the refiner rotor plates (25, 55) and stator plates (22, 60) through openings (40, 62, 85) formed in the stator plates for the admission of active hydrostatic fluid. The control fluid flows into the refiner gap under controlled volume and pressure, employing the refining plates as active hydrostatic bearings and flows into the process fluid. Hydrostatic control fluid is used, which is non-contaminated to the process fluid. The rotors of the paper pulp refiners may also be controlled by hydrostatic bearing surfaces formed between relative rotating and non-rotating components, such surfaces having passageways also opening into the process fluid. In the event of loss of control or function, the refiner may continue to operate on the hydrostatic bearings until the control function can be restored.

Abstract: The invention pertains to equipment and methods in which the rotatable drive member of a variable speed motor, such as a switched reluctance motor, carries a rotatable pulp processing element (10). Magnetic bearings (22, 24) levitatingly support both the rotatable drive member (15) and associated rotatable pulp processing element (41) and control axial and radial positionning thereof relative to the axis of rotation of the drive member.

Abstract: A rotary paper pulp refiner system and method includes a rotor having one or more refining elements mounted on a rotating shaft and complimentary non-rotating or stator elements defining with the rotating element a refining gap or gaps through which the paper stock material passes, and which the rotor is mounted for rotation on magnetic bearings that support the rotor shaft for rotation and define the axial and radial running position thereof. Optionally, a movable stator housing wall may also be controlled by a magnetic bearing.

Abstract: A refiner plate for a pulp refiner in which a sub-groove is provided in the refiner grooves, the sub-groove extending inwardly in the plate from the bottom of the refiner groove. The refiner plate is useful for shortening long fibers in a pulp slurry without treating short fibers present in the slurry.