Abstract: A non-self loading controlled deflection roll for a papermaking machine having a machine direction and a cross-machine direction, the roll including a shaft support member, first and second shell support members, a roll shaft having a longitudinal axis in the cross-machine direction, the shaft having axially spaced first and second ends, a roll shell surrounding the shaft, the shell having axially spaced first and second ends, the shell being rotatable about the shaft, a bearing pad supporting the shell relative to the shaft, the bearing pad being located between the first and second ends of the shell, first and second outboard bearings supporting the shaft relative to the shaft support member adjacent the first and second ends, respectively, first and second spherical bushings supporting the shell relative to the shaft, the first and second spherical bushings being mounted on the shaft axially inwardly of the first and second outboard bearings, respectively, each of the spherical bushings having a first annu

Abstract: A short dwell coater and film applicator coating has an application chamber between an inlet overflow baffle plate and a final metering element. An adjustable wedge is spaced in the machine direction from a fixed wedge to define a gap which serves as a coating extraction port. A cylindrical rod is positioned in the extraction port which is about 3/8th to about two inches in diameter and is driven to rotate at a rate of between one and one-hundred rpm. The rod serves to extract air and coating from the application chamber. Alternatively, an adjustable plate may be positioned to obstruct an opening leading to the extraction port.

Abstract: A ventilator apparatus is disclosed for supplying air from a source of pressurized air between a dryer and a web supported by a felt extending around a roll of a single tier drying section. The apparatus includes a housing which is connected to the source of pressurized air. The housing defines a nozzle for directing a flow therethrough of a current of air. The flow is directed from the nozzle towards a diverging nip defined between the dryer and the web supported by the felt when the felt diverges away from the dryer prior to the felt extending around the roll. The arrangement is such that the flow of air compensates for an underpressure generated by the felt when diverging away from the dryer so that fluttering of the web is inhibited.

Abstract: An extended nip press apparatus is disclosed for pressing a web. The apparatus includes an elongate press shoe which defines a concave surface. A backing roll cooperates with the concave surface for defining therebetween an extended nip pressing section for pressing the web. A looped bearing blanket slidably cooperates with the concave surface. The blanket is disposed between the shoe and the backing roll for supporting and guiding the web through the pressing section. A piston is pivotally connected to the press shoe, the piston being selectively urged towards the backing roll. The arrangement is such that when the piston is urged towards the backing roll, the piston urges the shoe and the blanket towards the backing roll so that the web disposed between the blanket and the backing roll is pressed. The piston has a first and a second portion, the first portion being disposed between the second portion and the shoe.

Abstract: A headbox has a tube bank of tubes arranged in machine direction rows. The tubes extend from an outlet wall of a header to the inlet of a nozzle. The upper and lower walls of the nozzle converge toward the nozzle outlet, and planes extending from the walls (nozzle roof and apron) converge to define an imaginary centerline extending in the cross-machine direction. The rows of tubes lie along radially extending planes defined with respect to the centerline. The injection ends of the tubes define a cylindrical surface extending between the nozzle walls. Stock from each tube is directed radially toward the centerline along flow paths of equal length. Trailing vanes may be positioned between the rows of tubes so that each flow experiences almost identical flow boundary conditions as it moves towards the nozzle outlet, hence contributing to more uniform fiber orientation in the resultant paper web.

Abstract: A method and apparatus for controlling the tension and position of a web roll being wound from a continuous traveling web, including a pair of winding drums supporting the winding roll in a pocket, positioning a pair of rider rolls with a looped belt span therebetween above the pocket on a beam and first pressing downwardly on the winding roll with a first rider roll, thereafter with the tensioned belt spanning the rider roll and the web roll, and thereafter with the belt and both rider rolls, while controlling the tension in the belt.

Abstract: A single tier dryer system has dryer rolls with a reversing roll positioned between each pair to transfer and wrap the dryer felt and paper web against the next dryer roll. A vacuum box is positioned between the dryer rolls and over the reversing roll to hold the web on the dryer felt by vacuum. Threading of a tail from the web is accomplished by blowing the web tail off a first dryer roll's surface with a jet of air positioned adjacent to the position on the dryer roll where the dryer felt leaves the dryer roll's surface. The vacuum box is divided by a baffle to isolate a portion of the vacuum box near the front of the dryer rolls, and a damper is positioned within the reversing roll to increase the vacuum in the isolated portion of the vacuum box to facilitate threading of the tail.

Abstract: Two racks of parallel spaced bars are supported for oscillatory motion from overhead drive shafts having eccentric cam surfaces. A first drive shaft is driven by a belt connected to a motor, and a second shaft is connected to the first shaft for synchronized movement by a rigid link. The bars are clamped to bar support beams without the need for bolts to extend through individual bars. The support beams are connected by side frames to the eccentric cam surfaces.

Abstract: An apparatus and method for protecting a wood chip destructuring device from damage due to tramp material. The destructuring device includes a pair of destructuring rolls operating a pre-established distance from each other and an infeed chute for delivering a stream of wood chips to pass through a region between the destructuring rolls. Said protection system includes a sensing unit and a control unit to detect tramp material present in the chip stream. If tramp material is detected in the wood chip flow, the protection system operates to further separate the destructuring rolls so that the surfaces of the destructuring rolls will not be damaged by the tramp material as the flow of material passes between the destructuring rolls.

Abstract: A rotor shaft extends axially through an interior cylinder defined by a housing. The shaft is mounted for rotation at one end. A flow of medium consistency stock is introduced axially to the cylinder, while a chemical inlet supplies bleaching chemicals axially to a rotor mounted on the shaft. The head of the rotor has turbine passages which accelerate the impinging bleaching chemicals along radial lines to be thus distributed across the whole aperture of the cylinder. Tapered vanes extend from the rotor adjacent to the rotor head and create circulating vortices which mix the bleach chemicals with the pulp. As the tapered vanes extend radially toward the cylindrical walls of the cylindrical housing, the vortices extend to the housing walls. The finely mixed bleaching chemicals and pulp are then forced through a foraminous cylinder which separates the interior of the cylindrical housing from an outlet volute by vanes which extend to near engagement with the foraminous cylinder.

Abstract: A single roll wash press comprising a housing and a drum rotatably mounted within the housing. The drum includes a perforated outer wall and a longitudinally extending centerline axis and is rotatable about the axis. The press further comprises a means for receiving a flow of pulp having an initial consistency ranging from about 2% o.d. to about 6% o.d. such that the pulp flows in the direction of drum rotation, and a means for defining a divergent formation zone and for forming a mat of the pulp on the drum within the divergent formation zone. The means for defining and forming comprises a first arcuate portion of the housing with the formation zone being divergent between upstream and downstream ends thereof. The upstream end of the divergent formation zone communicates with the means for receiving the flow of the pulp. The press further includes a means for washing the pulp mat within a displacement zone disposed downstream of the extraction zone.

Abstract: A pre-metering rod is located between a coating applicator and an air knife, and replaces the smoothing roll in some existing air knife applications. The pre-metering rod consists of a small diameter rod of about one and one-half inches in diameter that rotates at 10-500 rpm against the direction of the coating layer on the web. The web is wrapped around a portion of the circumference amounting to about twenty-five degrees of the rod's surface as it travels over the rod. The rod is supported in a rod holder supported on a support beam. Actuators move the support beam away from the web for threading and maintenance, and towards the web to engage the rod with the web. The combination of the rod diameter, the amount of wrap on the rod, and the speed of the rod rotation determine the amount of pre-metering of the coating, which determines the thickness of the coating layer on the web that is presented to the air knife section. As a result, the thickness of the coating layer can be decreased.

Abstract: A mixture of air and paper stock made from recycled paper from which the ink particles have been chemically released is injected into a cylindrical processing vessel. Added surfactants create a foam from the air as it rises through the stock and cause the ink particles to adhere to the air bubbles, resulting in a foam containing a concentrated fraction of the ink particles with some included fibers. The foam rises to the top of the vessel, and carries with it ink particles. Additional air injection ports can be used to increase the amount of foam generated and the amount of ink removed. Flow of stock and foam from the vessel can be controlled by adjusting valves on the stock and foam outlets. Flotation sensors allow the foam head to be maintained at the stock level by controlling the rate foam is withdrawn through the foam outlets.

Abstract: A single tier drying section is disclosed for drying a web. The drying section includes a dryer and a felt guided about the dryer such that the web is disposed between the dryer and the felt for drying a first side of the web. A further dryer is disposed downstream relative to the dryer and a further felt is guided about the further dryer such that the web is disposed between the further dryer and the further felt for drying a second side of the web. A dryer transfer mechanism is used for transferring the web from the dryer to the further dryer.

Abstract: The headbox apparatus of this invention contributes to the production of a paper web of uniform fiber orientation by controlling the edge flow of stock into the headbox nozzle through adjustable valves positioned in edge tubes in closed loop with a fiber orientation sensor. At the same time that fiber orientation is being control through adjustable valves position in the edge tube, basis weight of the web being formed is controlled by a stock dilution systems and an adjustable slice lip, in closed loop with a basis weight profiler sensor.

Abstract: A air density separation has a vertical air separation chamber that opens downwardly to allow rejected material to fall out the chamber through the open bottom. The air density separator is configured to recirculate the air and entrained fines, and so minimizes emissions and costly air treatment processes. The air separation chamber is connected by a first duct to a cyclone. A fan is positioned adjacent the lower end of the air separation chamber, and draws air through a second duct out of the cyclone for reintroduction into the air chamber. The fan by way of the cyclone draws air through the first duct from the air separation chamber. The fan exhausts into the vertical air separation chamber below the material infeed through a plenum. An oscillating screen composed of bars extends into the separation chamber of the air density separator and is used to disperse material into the separation chamber.

Abstract: A winding machine for winding up webs, possibly longitudinally divided webs, and preferably paper webs. The winding machine comprises two support rollers which support, in a winding bed, the roll to be produced and of which possibly one or both comprise casings which can be deformed, preferably to different degrees. During the winding process, the web running through the spacer gap between the two support rollers partially wraps around one of the two support rollers. The winding machine further comprises a space delimited by the two support rollers, the partly formed roll, and this space has sealed closures on its ends and a sealed closure below the spacer gap between the two support rollers. Finally, the winding machine generates excess pressure in this space in order to balance the inherent weight of the roll.

Abstract: A method and apparatus for coating a traveling paper web includes a coating applicator disposed in movably-controlled spaced adjacency with the paper web, which is supported on a rotating backing roll. The coating applicator permits a controlled introduction of a fresh portion of an aqueous slurry of coating material which is mixed with a recirculated portion of coating material in a controlled manner to prevent the formation of large vortices within the coating applicator. The coating material flows successively through mixing, convergent, and recirculation channels, all of which are defined on one side thereof by a distinct surface of a flow stabilizer which is positioned centrally in a cavity in the coating apparatus.

Abstract: A support structure for thin screenplates utilized for fine screens in Fibresaving applications for pulp fiber suspensions or the like wherein a support structure having a screen support in minimum screen contact positioned by a support reinforcement and positioning device, assembled to form an integral structure which reduces the stresses and deflections in the thin screenplates occurring in operation.

Abstract: The top and bottom felts at the web transfer between two dryer sections in a single tier papermaking dryer are spaced by pivoting the vacuum roll over which the felt and web move. The vacuum roll is mounted to two pivot arms which are driven by inflatable air rides to alternately incline the roll toward the downstream felt, forming a sandwich of the two felts and the web, and to a spaced position. The short motion of the vacuum roll allows standard felt stretchers to be used, and permits rapid adjustment of the felt spacing.