Abstract: A urethane covered metal press roll is provided by spray coating the roll body with a quick jelling resin formulation creating isolated small pores giving the cover a stone-like texture. The coating is applied to a desired depth by successive passes of a spray jet over the rotating roll body. The resin quickly jells and after being cured, the cover is ground to a desired diameter and finish.

Abstract: A plurality of axially spaced and axially resiliently flexible annular refining disks in a refiner working chamber have stock flow equalizing ports through the disks, and the pressure on opposite sides of the disks is balanced as by pressure balancing vanes associated with the ports. The vanes may be mounted on the disks at the ports or may be carried by rotor structure and aligned with the ports.

Abstract: A paper machine trailing element for use in a slice in a headbox wherein the trailing element is formed of laminations with a bead at the upper end for anchoring the element in a slice chamber with the bead formed of laminations with fibers on the outer surface in the machine direction and in the cross-machine direction within the bead so that the element has a greater stiffness in the machine direction at the upstream end with the element tapering to a thin tip at the downstream end and the downstream end formed of laminations with fibers extending in the cross-machine direction for a greater stiffness to minimize instability.

Abstract: A paper machine press with a web being picked off a forming wire and passed through a first two roll nip sandwiched between upper and lower felts, the web transferred to the lower felt and then to a felt of a second press with the second double felted press being an extended nip type formed between an upper roll and a lower concave shoe with a relieved leading edge and a water impervious belt passing through the nip sliding over the shoe with the belt being guided on an annular stationary guide, the web transferred to the upper felt following the extended nip by a suction shoe within the felt and thereafter the web being transferred to a fifth felt.

Abstract: Apparatus for supporting a coater blade as used in paper forming. The apparatus comprising a blade support, clamping means for locating the blade against the blade support, and a profile support engaging the coater blade. The profile support is an elongate plate-like member which is clamped adjacent one edge and whose other edge engages the coater blade. Adjustment means is provided to adjust the position of engagement of the profile support with the blade in a direction tangential to the plane of the coater blade. The adjustment being provided by a row of screws whose heads co-operate with the profile support and which engage threadingly with a mounting means for the profile support. Spring means acts in opposition to the screws.

Abstract: In a forming section of a papermaking machine, a foil blade for being positioned in close running relation with a wire for dewatering a web on the wire, a mount for the foil positioned to support the foil in its operative position and an inflatable member between the mount and foil securing the foil tightly in operative position preventing rocking when inflated and releasing the foil when deflated so that the foil can be slid out in a cross-machine direction.

Abstract: In a paper making machine dewatering press section substantially equally pressing and dewatering of both faces of a freshly felted paper sheet web is effected by running the web through first press roll means providing a double action first dewatering nip between corunning porous dewatering felts, and successively thereafter running the web through a four roll stack providing second, third and fourth nips without an open paper draw. In the second nip the web is run in dewatering felt engagement with one face of the web, and the opposite face of the web is in direct non-dewatering surface compacting roll engagement in such nip. In the third nip both faces of the web are in direct surface compacting engagement with the non-dewatering press rolls. In the fourth nip, a second dewatering felt runs in engagement with said opposite face of the web and said one face of the web is in non-dewatering surface compacting press roll engagement.

Abstract: An endless impervious, oil, abrasion and crush resisting belt for paper making machinery such as presses, especially of the extended nip type, calender rolls, and the like has a woven fiber base, such as scrim, and a urethane coating impregnating the base providing an integral layer of substantial thickness with pores forming a granite like finish providing excellent paper release properties. The surface finish of the belt can be modified with subsequent grinding and coating treatments and can be grooved if desired. The belt is formed by looping an endless scrim blanket around driving rollers providing a travelling run which is sprayed with a two component polyurethane coating which quickly gels to accommodate building up of a layer of the desired thickness by controlling the fluid flow and the speed of the travelling run.

Abstract: Destruction of the bond of urethane roll covers to metal paper machine rolls is eliminated by venting the interface of the urethane and the metal to the atmosphere. Venting of the interface can be accomplished by drilling small holes through the roll periphery, by applying an adhesive substrate to the roll with grooves exposed to the atmosphere, by providing porous wicks between the roll and cover or by grooving the periphery of the roll to provide channels exposed to the atmosphere.

Abstract: A mechanism and method for continuously washing wood pulp fibers including a looped traveling foraminous wire, a plurality of stock chambers above the wire arranged sequentially in the direction of wire travel to provide a sequence of baths submerging the wire, pumps beneath each of the baths removing water drained through the wire and pumping the water back into the next upstream bath, means feeding stock into the first bath, and means measuring the level of stock in the first bath and supplying fresh water to the last bath as a function of the level, and pressing the stock between a roll and the looped wire in the last bath and removing the stock from the roll as it is carried upwardly out of the bath.

Abstract: A web tension load cell for a paper mill and the like wherein the load cell is mounted in a member which can flex due to a metal flexture point that eliminates mechanical back lash such as occur with ball or roller bearings. As the load on a roller varies flexture will occur at the metal flexture point which will transfer a load onto the load cell which is detected and converted into a signal for controlling a tension control that varies the tension on the roller. Top and bottom plates and the load cell are designed so as to maximize the structural stiffness to optimize the mechanical stiffness and mechanical vibration frequencies of high speed winders utilized in paper mills.

Abstract: A circular rotary slitter construction comprises a body hub having a circular perimeter and at least one axially facing surface. A cutting edge hoop cylinder is fixedly mounted on the body hub perimeter. At least that portion of the axially facing surface contiguous to the hoop cylinder is axially inset from an annular cutting edge of the hoop cylinder so that the annular cutting edge margin of the hoop cylinder overhangs the contiguous axially facing surface cantilever fashion and the cutting edge is axially outwardly spaced relative to the contiguous axially facing surface. The hoop cylinder is adapted to be made from tool steel and the body hub is adapted to be made from a more easily machined material such as aluminum and at least partially from a suitable plastic material.

Abstract: A method and apparatus for deinking a fibre stock or slurry. In order to optimize the separation process the invention proposes to independently control the air injection phase, the mixing phase, and the separation phase by splitting them into separate steps.Thus, there is provided a separation cell which is fed with slurry from an inlet. Air is introduced into the slurry before entry into the separation cell and before entering a mixing section which mixes the air and slurry before entering the separation cell. The air is introduced under pressure by way of a porous sintered sleeve, while the mixing is achieved by the provision of three turbulence discs in the preferred embodiment. Alternative turbulent generating means may be employed.The mixing ensures contact of the ink with the air bubbles which separate out in the separation cell and rise to the surface as a foam. The foam is removed by suction, while the deinked fibre slurry is drawn off from the tank by means of a weir or stand pipe.

Abstract: A balance valve for maintaining two fluid pressure systems at a predetermined pressure relative to one another. The valve comprises a piston slidably received within a bore and subjected on opposite ends to the pressure in the two systems. Each of the two systems is provided with a relief line whose communication with the associated system is controlled by movement of the piston such that any imbalance of forces acting on the piston causes the appropriate relief line to be opened to balance out the forces. The ports controlled by the piston and communicating with the relief lines are triangular in shape. In one embodiment a respective spring acts on each end of the piston to determine the relative pressure levels in the two systems. In another embodiment means is provided to resist movement of the piston in response to rapid pressure fluctuations.

Abstract: A winder for continuously winding a traveling web such as paper onto a large roll with a support roll in contact with the roll being wound such as where the support roll is one or both of a pair of parallel horizontally extending drums with the outer surface of the drum being of rubber with embedded nonextensible annular cords and the surface being supported by a plurality of inflatable chambers along the length of the drum so that the outer surface of the drum deforms with contact with the roll being wound and accommodates irregularities along the length of the roll being wound.

Abstract: An automatic decurling apparatus is provided for webs of paper material in which two small diameter decurling bars are adjusted into both sides of the web run between two closely spaced rollers around which the web passes in an S-wrap. The decurling bars can be independently adjusted into the web in varying degrees to compensate for predominant curl in one direction of the web. Additional decurling can be obtained by chilling the rollers, incorporating high-intensity dryers in the web path or by moisturizing one or both sides of the web prior to its passing the decurling bars.

Abstract: Substantially uniform heat transfer through the cylindrical heat transfer wall of a steam heated hollow dryer drum is attained by longitudinal spoiler bars effecting turbulence of condensate throughout a major extent of the inner surface of the heat transfer wall, and condensate turbulence is generated in a narrow annular area from which a stationary siphon intake head withdraws the condensate from the steam chamber. A turbulence promoter is carried by the intake head and may comprise rigid or yieldably supported structure, e.g. a brush, rigid or flexible bar structure, an array of fingers, mounted on the downstream or off-running side of the intake head having regard to the direction of rotation of the drum.

Abstract: Disk screen apparatus and disk assemblies therefore wherein each disk assembly comprises an elongate shaft adapted to be rotatably mounted in the disk screen apparatus. The shaft has elongate indexing and keying structure extending longitudinally along and rigid with the shaft and providing a longitudinally extending and circumferentially facing edge. The edge has a series of longitudinally spaced circumferentially extending indexing and keying notches therein. Annular screen disks are mounted on the shaft and have inner diameter key shoulders engageable in the notches. The keying structure may be raised along a longitudinal area on the cylindrical perimeter of the shaft or recessed along such area. A releasable locking bar is adapted for locking the key shoulders in the notches.

Abstract: An extended nip press having a press nip formed between a first press roll and a looped traveling belt wrapping a portion of the roll with the belt having a shaped mandrel therein with a concave surface conforming to the roll facing the nip and a concave surface facing away from the nip conforming to a support roll with lubricant between the mandrel and belt and the rolls having a deflection control means with the mandrel being self-positionable during operation of the press.

Abstract: An apparatus and method for reducing particulate material such as paper making pulp between radially extending relatively rotatable and axially confronting refining surfaces between which the material must pass while being refined during relative rotation of the surfaces. The refining surfaces are mounted on resiliently flexible disks for operating pressure responsive clearance adjustment of the relatively rotating refining surfaces axially relative to one another, for attaining optimum material refining results from the refining surfaces.