Abstract: An arrangement for doctoring a belt or a soft roll surfacing in a paper or board machine includes a doctor set in connection with a surface with a doctor blade fitted in it for doctoring the surface. The doctor blade is at least partly of a material, the hardness of which is essentially equal to or less than the hardness of the material of the surface, in order to prevent the doctor blade from cutting into the surface. The material is arranged to form a layer extending over the entire width of the doctor blade, and the thickness of which throughout is at least half of the thickness of the doctor blade. A support construction is arranged in the doctor blade, which together with the layer is arranged to form the doctor blade.

Abstract: An apparatus for one of direct and indirect application of a coating medium onto a traveling fiber material web includes at least one doctor element for application and/or metering of the coating medium. At least one doctor element is formed of a carbon fiber material.

Abstract: A composite composition to be used in a doctor blade construction, said composite laminate construction comprising: (a) one or more central layers comprising an engineering thermoplastic resin filled with heat-resistant, non-glass, long strand fibers; (b) one or more intermediate layers positioned over the one or more central layers, each said intermediate layer comprising a carbon layer; and (c) one or more surface sheets positioned over the one or more intermediate layers.

Abstract: The invention relates to an arrangement for loading a deflection compensated roll (1) or other elongated member in a paper/board or finishing machine and for providing an articulation bearing assembly, the roll or elongated member being provided with a stationary support shaft (3) extending axially of the roll or the elongated member or with stub shafts present at the ends thereof, the support shaft ends or the stub shafts protruding from the roll or the elongated member and being mounted on a bearing block (9). The arrangement of the invention comprises at least one hydrostatic main loading element (4), which is mounted on the bearing block (9) and works on the support shaft (3) or the stub shafts of the roll (1) or other elongated member and which constitutes a loading element and, at the same time, an articulation bearing assembly for the roll or other elongated member.

Abstract: A multilayer composite doctor blade has a side edge configured for application to the surface of a rotating roll in a paper making machine. The doctor blade has an inner core and intermediate layers. The doctor blade may also include outer layers. The inner core is predominantly polymeric material. The intermediate layers on opposite sides of the core include reinforcing fibers. The side edge of the doctor blade has an abrasiveness as measured by ASTM test method D5181-91 of between about 4.0 to 5.0.

Abstract: An apparatus for doctoring a roll surface including a pivot bar adapted to be mounted on a doctor back and which the pivot bar defines an upwardly projecting fulcrum. A first shelf projects forwardly beyond the fulcrum and a top plate pivotally supported on and projecting forwardly beyond the fulcrum overlies the first shelf. The top platen is held downwardly against the fulcrum. Blade support members are carried by and cooperate with the top plate to define forwardly open slots, which slots are configured and dimensioned to receive a rear edge of a forwardly projecting doctor blade. The blade support members have rearwardly projecting second shelves underlying the first shelf and a loading mechanism is interposed between the first and second shelves for pivoting the top plate on the fulcrum in a direction urging the doctor blade against the roll surface.

Abstract: In a paper machine having a roll rotating about an axis extending in a cross machine direction, and having a doctor blade applied to the roll surface by a blade holder parallel to the axis and carried on a doctor back, an apparatus is provided for accommodating relative movement between the blade holder and the doctor back in the cross machine direction during mounting and removal of the blade holder. The apparatus comprises a rail fixed to the doctor back and extending longitudinally in the cross machine direction. A groove extends along the length of the guide rail. The groove has a bottom, a width measured between confronting sides, and a top defined by ledges projecting inwardly from the sides, with inner edges spaced one from the other to define a slot that underlies the blade holder and has a width narrower than the width of the groove. A plurality of shafts are spaced along the length of the blade holder and project downwardly through the slot and into the groove.

Abstract: A loading arrangement in a paper machine doctor includes a blade carrier, a blade holder, and loading devices to turn the blade holder in relation to the blade carrier and thus to press the doctor blade against the surface to be doctored. The loading devices include at least one operating device including longitudinally arranged loading components and a pressure medium connection extending to each of the loading components to make the profile of the doctor blade conform to the surface to be doctored.

Abstract: The invention relates to a doctor assembly in a paper machine, which is intended to clean, e.g., a roll, and which includes a surface against which a doctor blade is set, a blade support for supporting the doctor blade, a frame, a jointed bearing assembly, which supports the doctor blade and is itself supported from the frame, and which is parallel to the doctor blade, and extends essentially over the entire width of the roll, and loading devices between the blade support and the frame for turning the doctor blade in relation to the frame and for pressing the doctor blade against the surface with a selected pressure. Due to the continuous support, there is essentially no deflection in the doctor assembly, when it is attached by its frame directly to the structures of the paper machine.

Abstract: A creping blade for creping a cellulosic web from a rotatable cylinder in a creping process includes first and second side faces. The first side face is at least substantially opposite to the second side file. The blade also includes an upper surface adjacent to the first and second side faces. A plurality of notches is provided along the upper surface. Each of the notches has a bottom portion and an open end defined by at least a portion of the upper surface. The notches are configured to increase the caliper of the cellulosic web when the creping blade crepes the cellulosic web from an outer surface of the rotatable cylinder. Creped paper and improved methods of manufacturing paper are also provided.

Abstract: A composite doctor blade comprises a steel support band configured with a width and thickness suitable for mounting in a blade holder, with tensile and yield strengths suitable for a selected doctoring application. A wear resistant strip of high speed steel is integrally joined to an edge of the support band. The wear resistant strip has tensile and yield strengths higher than those of the support band, and has a hardness of between about 55 to 65 Rc.

Abstract: The invention concerns a caring doctor blade for a paper/board machine, which blade comprises layers of fiberglass and carbon fiber and a caring layer as a rigid laminated structure, which caring layer comprises carbon fiber and grinding particles in direct vicinity of the carbon fibers. The orientation of the fiberglass layers is parallel to the longitudinal axis of the blade, and at least in some of the layers that contain carbon fiber the orientation of the carbon fibers is substantially diverging from the direction of the longitudinal axis of the blade. The invention also concerns a method for manufacture of a doctor blade for a paper/board machine by means of a pultrusion method.

Abstract: A hydrofoil blade having a top surface with a leading edge in contact with a forming fabric and a trailing edge, and a leading side surface disposed transversely to the direction of movement of said fabric upstream of and generally at an acute angle to the top surface thereby draining water from the stock. A plurality of slots extend at an acute angle from the leading side surface to a point between the leading and trailing edges on the top surface to force a portion of the drained water back into the stock, whereby any flocs formed in the stock are dispersed in the transversal shear generated by the drained water.

Abstract: Device for conditioning, cleaning, and/or keeping clean at least one of a rotating roll and a circulating belt of a paper machine. The device includes at least two doctors arranged behind one another in a roll and/or belt travel direction and spaced at a distance from one another. The at least two doctors are assigned to the at least one of the rotating roll and the circulating belt.

Abstract: A beam with a continuous body (11) of a composite material has end pieces (13) fitted at each end of the body (11) and axle journals (12) fitted on the end pieces (13). Each axle journal (12) is supported on the frame constructions of the machine by means of a support construction (15, 20, 21, 30, 31, 100), in which there are bearing members (21, 31) fitted at a distance from one another in the longitudinal direction of the axle journal (12). The bearing members (21, 31) are fitted in bearing housings (20, 30), and a bending mechanism (40, 50, 60) is fitted in the support construction (15, 20, 30, 100), by which a torque is applied that bends the body (11) of the beam. The beam may support doctor blades, various measurement devices, induction devices, and coating devices.

Abstract: An apparatus for doctoring a moving surface includes a blade holder component extending longitudinally across the moving surface and carrying a doctor blade. A support component is parallel to and supports the blade holder component. A first operating mechanism rotatably urges the doctor blade in a doctoring direction into contact with the moving surface, resulting in the doctor blade being acted upon by a reactionary thrust force in the plane of the doctor blade and a reactionary rotational force in a direction opposite to the doctoring direction. A pair of mutually opposed parallel guide rails are provided on one of the components, and rotatable rollers are spaced along the length of the other of the component.

Abstract: A beam structure (10) made of a composite for a pulp machine/paper machine/board machine or for a paper/board finishing device. The beam (10, 10a1, 10a2) is formed of a first curved part (12) and of a second straight part (13) joined thereto, to which second straight part (13) a doctoring, coating or measurement apparatus (110) is attached.

Abstract: A loading hose for use in a paper machine doctor or coating device, which loading hose is located between the doctor's or coating device's blade support and rotatably arranged blade holder, is arranged to load the doctor blade of the doctor or the coating blade of the coating device. The loading hose incorporates a flexible casing, which is pressure-resistant and of a uniform cross-section. The loading hose includes at least one stiffening member attached to the casing and arranged to lie against either the blade support or the blade holder.

Abstract: A doctor blade for use in cleaning a roll in a paper machine comprises a thermosetting plastic polymer material selected from the group consisting of vinylesterurethanes and polyether amides.

Abstract: A doctor apparatus comprises a base adapted to be fixed to a doctor back and having a shelf projecting forwardly therefrom. A compliant top plate overlies the forwardly projecting shelf. The top plate has a rear portion fixed with respect to the base, and a front portion projecting forwardly beyond the shelf. Mutually spaced blade support members are secured to the underside of the front portion of the top plate. The blade support members have front portions underlying and cooperating in spaced relationship with the underside of the front portion of the top plate to define mutually aligned receiving slots, and have rear portions underlying and cooperating in spaced relationship with the shelf to define mutually aligned recesses. A doctor blade has a rear portion removably retained in the receiving slots, and a front portion projecting forwardly beyond the top plate. A resilient element is confined in the recesses between the shelf and the rear portions of the blade support members.

Abstract: A method of dividing a formed paper web into at least two partial-width webs during production of creped paper in a paper machine having a cylinder with an adhesive coating to which the web adheres. The web is divided in conjunction with the cylinder by one partial-width web being detached by scraping from the outer surface at a first web-detaching point while the other partial-width web, still adhered to the outer surface, accompanies this surface to a second web-detaching point situated downstream, to be detached by scraping from the outer surface, at least one partial-width web being creped off. The invention also relates to a apparatus and a paper machine including such a apparatus having doctor blades forming the web-detaching points.

Abstract: An apparatus for doctoring a roll in a paper machine, comprising a doctor blade and an integral blade holder including a support tray carrying fluid actuated tubes for applying the doctor blade to the roll. The blade holder is removably mounted on and releasably secured to the doctor back.

Abstract: Coating blade for applying coating material onto a travelling web (41), particularly coating liquid onto a travelling paper web, comprising a steel band (3), which, along the edge section (7) intended to engage the web (41), is provided with a wear-resistant coating (5). Said coating is constituted by a material which has a hardness according to Shore A of from about 30 to about 80.

Abstract: A slide positioner for moving a structural member from an inoperating position to a working or operating position has a square shaft for supporting the structural member. Two bearing assemblies are adapted for supporting the sliding shaft. The two bearing assemblies are spaced one from the other and are connected to a stationary base. One of the bearing assemblies is rigidly connected to a pneumatic cylinder whose piston rod is connected to the sliding shaft. The bearing assemblies are mountable to the base in various angular positions since the bearing assemblies may be pivoted around an axis which is parallel to the axis of the sliding shaft.

Abstract: A doctor beam for mounting a doctor to a roll or cylinder in a paper or board machine. The doctor beam including a shaped face having a curvature that conforms to the curvature of the roll or cylinder being doctored.

Abstract: A paper machine for manufacturing a structured soft paper web are described, which machine has a wet section, a press section, a drying section and a web-carrying clothing running around a suction device close to a smooth impermeable belt in the press section for the creation of a transfer point. In accordance with the invention, structuring means for structuring the web are arranged between the press section and the drying section.

Abstract: A composite blade, in which there is an essentially plate-like blade component with a composite-construction and retention members arranged in its rear part is intended to be installed in a special blade holder with the retention members remaining in the throat of the blade holder. The retention members are formed of a profiling arranged as a lateral extension of the blade component. The profiling extends essentially over the entire length of the blade and is of the same piece as the blade component.

Abstract: Machine and process for producing a fiber material web that includes at least one press device having a shoe press unit and a drying drum, such that the shoe press unit and the drying drum are positioned to form an elongated press nip. The machine also includes at least one belt that is water-permeable and water-absorbent and that is adapted to guide the fiber material web through the press nip, and at least one suction device located ahead of the elongated press nip, relative to a belt travel direction. The at least one belt is guided over the at least one suction device. The process includes guiding the at least one belt over the at least one suction device and suctioning the at least one belt, such that moisture is removed from the at least one belt, and guiding the fiber material web and the suctioned at least one belt through the extended press nip.

Abstract: A doctor blade structural support has the form of a hollow structural member of roughly triangular cross-section, one side of the triangular cross-section being substantially tangent to the surface of the dryer roll. A quantity of water is disposed within the hollow structural member and resides on the inside surface of the structural member adjacent to the heated dryer roll surface. The interior of the doctor support structure is sealed from the atmosphere and is evacuated so that the interior of the structure contains only water and water vapor. Heat radiating from the dryer roll surface to the doctor support structure causes water disposed on the inside surface adjacent to the dryer roll to evaporate, thus raising the internal vapor pressure in the sealed interior of the doctor support structure. The water vapor continuously condenses on the inside surfaces of the support structure which are not exposed to radiant heating from the dryer roll.

Abstract: Creping blade for the detachment of a travelling paper web from a dryer cylinder, said blade having an edge or tip section engaging said cylinder and being constantly hit by the traveling web during its detachment from the cylinder. The invention resides in the improvement of said edge or tip section being provided with a wear-resistant coating on a first part of said edge section hit by the web, the other part of said edge section engaging the cylinder being uncoated or coated with a non-wear-resistant material so that said other part is subjected to sliding wear. A recess is located in the side surface so that the wear land surface that contacts the cylinder remains essentially constant throughout the operative cycle of the blade.

Abstract: There is disclosed a doctoring apparatus for doctoring a cylindrical rotating surface of a machine. The doctoring apparatus includes a blade carrier assembly for holding a blade for doctoring a cylindrical surface. The blade carrier assembly further includes at least one movable tenon. The blade carrier assembly slides across a supporting surface of a doctor back. The doctor back includes a mortise which is sized to loosely receive the tenon to permit the tenon to slide within the mortise as the remainder of the blade carrier assembly slides over the supporting surface of the doctor back. Once the blade carrier assembly is located in a position relative to the doctor back, an adjustment mechanism carried by the blade carrier moves the tenon into locking engagement with the mortise. This adjustment mechanism is a releasable securing mechanism which allows the tenon to move in and out of locking engagement.

Abstract: A support beam for at least one long working unit, notably of a paper machine or coater, includes several bundled, long profile elements forming in their entirety the support beam.

Abstract: A holder is disclosed for applying the working edge of a doctor blade to a moving surface. The holder has upper and lower holder members constructed and arranged respectively to contact upper and lower surfaces of the doctor blade, with the doctor blade projecting forwardly to terminate at its working edge. One of the holder members comprises a composite of sandwiched elements enclosing one or more chambers having forwardly directed outlets. A pressurized fluid is introduced into the chambers for forward application via the outlets and along a surface of said doctor blade onto the surface being doctored.

Abstract: Blade holder for creping of a web travelling on a rotating cylinder (2) or for doctoring the surface of the cylinder, comprising a blade (3) directed opposite to the travelling direction of the cylinder (2), a blade carrier (41) for the blade, further comprising a pressure ledge (13) extending along the whole length of the blade and arranged to exert a pressure at or adjacent to the upper longitudinal edge of the blade (3) via pivotable pressure arms (15) evenly distributed along the length of the ledge and arranged on the blade carrier (41) to bring said edge to engagement against the cylinder (2). Each pressure arm (15) is arranged to be individually actuated by a pressure means having a double folded membrane (35) for actuation of the pressure arm (15) by means of a pressure medium.

Abstract: A creping doctor blade and method of forming such blade including a thin flexible generally planar creping member having an elongated flexible, substantially prismatic body having a relieved substantially planar engagement surface adapted to bear against the drying cylinder. A rake face of the creping doctor blade extends generally outwardly relative to a surface of the rotatable drying cylinder when the creping blade engages the cylinder and the length of the substantially planar engagement surface is generally equivalent to the width of the drying cylinder with the width of the substantially planar engagement surface being selected so as to correspond to the wear pad dimension of a conventional blade used in the same processes and is generally in a range from about 0.005 inches to about 0.020 inches with the relief face of the blade adjacent to the rotatable drying cylinder having an elongated depression having a depth of at least about 0.

Abstract: A dust and fiber control device for paper making apparatus is described. The device includes a wall in conjunction with a feed spout for providing a water curtain. The water curtain serves to capture and remove air suspended dust and fiber particles from ambient air. The device is positioned transversely to the motion of a paper web underneath the web between a drying cylinder and a rewinder. The water curtain device is utilized in conjunction with air flow devices for assisting in controlling the collection of air suspended dust and fiber particles from the ambient air.

Abstract: A process for producing a creped sheet as well as a creping blade and creped paper product formed by such blade is set forth with the process including the steps of adhering a cellulosic web to a moving surface, providing a stepped creping blade disposed to crepe the cellulosic web from the moving surface and creping the cellulosic web from the moving surface forms a creped paper product having greater bulk and absorbency than previously prepared creped paper products.

Abstract: A creping doctor blade and method of forming such blade including a thin flexible generally planar creping member having an elongated flexible, substantially prismatic body having a relieved substantially planar engagement surface adapted to bear against the drying cylinder. A rake face of the creping doctor blade extends generally outwardly relative to a surface of the rotatable drying cylinder when the creping blade engages the cylinder and the length of the substantially planar engagement surface is generally equivalent to the width of the drying cylinder with the width of the substantially planar engagement surface being selected so as to correspond to the wear pad dimension of a conventional blade used in the same processes and is generally in a range from about 0.005 inches to about 0.020 inches with the relief face of the blade adjacent to the rotatable drying cylinder having an elongated depression having a depth of at least about 0.

Abstract: A paper machine for manufacturing a web of soft crepe paper comprises a wet end (1) having at least one forming wire (4) for forming and supporting a web (7), and a drying section (2) with a through drying machine (13), a drying cylinder (17) and a perforated belt (19) running around a through-blow cylinder of the through drying machine and a transfer roll (21) at the drying cylinder, the web running through the through drying machine being exposed to drying air after its transfer from the forming wire. The belt (19) and the web (7) move from the through drying machine (13) to the drying cylinder (17) in a run that is free from mechanical means which would compress the web, whereby in said run the surface of the web which is exposed to the drying air faces away from the belt and remains free from contact with such means up to the drying cylinder.

Abstract: A process for producing a creped sheet as well as a creping blade and creped paper product formed by such blade is set forth with the process including the steps of adhering a cellulosic web to a moving surface, providing a stepped creping blade disposed to crepe the cellulosic web from the moving surface and creping the cellulosic web from the moving surface forms a creped paper product having greater bulk and absorbency than previously prepared creped paper products.

Abstract: A dryer roll of a paper machine is provided with a doctor assembly, including a doctor blade. A contaminant removal assembly includes a hood mounted in a cantilevered manner to a support extending parallel to the axis of rotation of the dryer roll, and the hood extends downstream from the support and is in sealing contact with the upper surface of the doctor blade to form a channel between the doctor blade, the hood, and the surface of the dryer roll. Air amplifiers are provided at both ends of the hood for creating an airstream extending longitudinally of the hood and exhausting at one end thereof to remove fuzz picked up by the doctor blade on the surface of the dryer roll.

Abstract: In a papermaking machine for forming tissue paper, a turning bar is disposed having a curved surface about which a web of tissue paper is turned. The bar has an internal air plenum which supplies air to two sets of holes or slots. The first set is arranged to direct air normal to the curved surface of the bar or in the machine direction, the second set is arranged to direct air toward the edges of the tissue which is turned around the bar. The second holes or slots produce air jets which apply a cross machine direction tension to the web which prevents wrinkling of the web. The first set of holes or slots forms jets of air that prevent the tissue web from contacting the turning bar.

Abstract: An apatus for doctoring a roll in a paper machine, comprising a doctor blade and an integral blade holder including a support tray carrying fluid actuated tubes for applying the doctor blade to the roll. The blade holder is removably mounted on and releasably secured to the doctor back.

Abstract: To carefully control the creping conditions when creping off a paper web (1) by means of a doctor blade (5) from the cylinder surface (2) of a Yankee dryer (3), a first sensor (82;85) is provided for measuring on-machine a value of the caliper, the crepe macrostructure, or some other property of the just creped off paper web (1), the measured value is monitored continually, and, on detecting an undesirable change in the value caused by blade wear, the doctor blade (5) is pivoted substantially around its working edge (6) to increase an impact angle (A), formed at the working edge and affecting the monitored web property, to such an extent as to minimize or at least counteract the undesirable change. Preferably, the sensor (82;85) is connected to a programmable processor (90) for automatically controlling the pivoting of the doctor blade (5).

Abstract: An integral outboard bearing support for a gear reducer on a papermaking machine oscillating doctor. The bearing support rotatably supports a distal end of the gear reducer's drive shaft to reduce deflection and fatigue. The outboard support also aligns internal bearing supports with the outboard support to optimize performance by preventing current reducer shaft and support bearing failures.

Abstract: A web support foil positioned adjacent to a Yankee dryer above a creping doctor. The foil supports the web as it leaves the dryer. Mounted to the top of the foil is an adjustable air deflector which is positioned tangent to the Yankee dryer. The air deflector blocks air moving along the web. A slotted opening draws air from a leading-edge pocket collecting fibers which are broken loose during the creping action. The web is held against the bottom side of the foil by one or more air jets which are directed over the bottom surface on the foil. The jets of air function as coanda air jets and prevent the web from sticking to the bottom surface of the foil while creating a Bernoulli effect which holds the web against the bottom of the foil.

Abstract: A blade holder for disposing a blade proximate to a roll for transporting a continuous web of material includes a blade positioned transversely to a direction of movement of a continuous web of material. The blade tensioning device is disposed on a blade supporting beam extending transversely to the direction of movement of the web, the blade supporting beam swivelable and oscillatable transversely to the direction of movement of the web. The holder includes a supporting element and a stand having a bracket upon which a first drag bearing is disposed, the supporting element rotatably supported by the first drag bearing. A second drag bearing links the supporting element, the blade supporting beam, and a lever. The holder also includes a swiveling device for swiveling the blade supporting beam from a working position to a maintenance position and a positioning device for adjusting a blade working angle.

Abstract: It is an object to obtain a blade 1 with which coating or scraping can satisfactorily be performed and which is able to protect a plate-like member 3 from being broken.A blade having a ceramic plate-like member 3 having an edge 3a and secured to the surface of an elongated metal plate 2 in the leading end portion of the elongated metal plate 2, wherein the blade 1 is deflected by 10 cm or more in the direction of the thickness thereof owning to the deadweight without breakage of the ceramic plate-like member 3 when the blade 1 is supported at two ends thereof which are apart from each other by 1 m or longer in the lengthwise direction thereof.

Abstract: The invention is directed to a paper making machine having a wet end associated with a wet fiber web. A forming fabric has a plurality of voids therein and carries liquid from the fiber web. A roll disposed at the wet end of the paper making machine carries the forming fabric. The roll and the forming fabric define a diverging area therebetween which causes liquid in the forming fabric to exit the voids. A doctor back includes a doctor element associated with the roll. A shower provides a liquid output which is directed relative to and lubricates the doctor element. A suction chamber has an at least partially open top and an outlet. The open top is positioned relative to each of the doctor blade and the diverging area to collect liquid from the shower and liquid exiting the voids in the forming fabric in the diverging area. A cyclone separator connected to the suction chamber receives liquid from the suction chamber outlet.

Abstract: The invention relates to an apparatus to produce a layer of material, such as paper, carton or cardboard. A number of cylinders and rollers carry the continuous layer of material along a meandering path. A stationary cleaning tool acts upon the surface of at least one of the rollers and/or cylinders. The cylinder or roller whose surface the cleaning tool is affecting is mounted so that it is allowed to move in an oscillating fashion relative to the stationary cleaning tool in the direction of the axis of rotation of the cylinder or roller.