Abstract: A scraper bar is used in a plant for producing a paper web with a sieve belt. The sieve belt is movable over the scraper bar transversely with respect to the longitudinal extent of the scraper bar. The scraper bar has wearing elements which face toward the sieve belt, are mounted on a supporting bar and are arranged one after the other in the direction of the longitudinal extent of the scraper bar. The supporting bar has supporting bar elements which are arranged one after the other in the longitudinal extent and which are preferably connected to one another and on which the wearing elements are fastened.

Abstract: A dewatering device has a dewatering box and a plurality of dewatering strips. A contour of at least one dewatering strip changes over its length. There is also described a machine for the production of a fibrous web, such as a paper, cardboard or tissue web, with a dewatering device of this kind, and to the use of the latter in a machine of this kind.

Abstract: A sealing strip for sealing a suction zone of a suctioned roll of a machine for producing and/or processing a fibrous web has wear volume, which is gradually worn away by tribological contact with the roll. The sealing strip system further includes a sensor system for detecting the state of wear of the sealing strip, and an evaluation unit. The sensor system is embedded in a sensor channel extending within the sealing strip in the longitudinal direction at the wear volume across substantially the entire length of a sealing surface of strip, and is connectable to the evaluation unit and/or to a unit for supplying the sensor system with a medium for generating information via a connection provided on the lower side of the sealing strip, and leading out of the strip on the side of the wear volume facing away from the sealing surface.

Abstract: A system is disclosed for removing fluids from a felt in a paper making process. The system includes a vacuum source for providing a vacuum adjacent a vacuum plate against the felt is moved, and crescent shaped openings in the vacuum plate through which the vacuum is applied to the felt for the removal of the fluids.

Abstract: A method for monitoring a wear structure including at least one wear element in a machine for generating or processing a fibrous material web, includes providing a time at which the wear element became operational, providing a time at which a defined first wear level of the wear element was reached, providing at least one further characteristic variable, and predicting a remaining operating time of the wear element from the knowledge of the times, in particular from a time difference between the times, as well as from the at least one further characteristic variable, by using a computer system. A device for carrying out the method is also provided.

Abstract: A roll coating is manufactured having fiber and polyurethane made from aromatic isocyanate. The roll coating incorporates fiber having improved strength during the manufacturing stage, and so does not crack, as a result of which the coating can be manufactured in a simple, efficient and inexpensive manner. A roll of a fiber web machine has a roll body having a coating of fiber and polyurethane that is made from aromatic isocyanate, on the roll body.

Abstract: The invention relates to vacuum equipment for a fiber web machine. The vacuum equipment includes a frame (13) arranged to be supported to the fiber web machine. The vacuum equipment also includes a wearing construction (15) adapted to the frame (13) and arranged partially open on the surface by means of several openings (14) for extending a vacuum effect out from within the frame (13) and further to a fabric (16) included in the fiber web machine and set in contact with the wearing construction (15). The wearing construction (15) is a plate construction (17), the raw material thickness s of which is equal to or smaller than the distance x between the opposite edges (18, 19) defining the opening (14). The invention also relates to a fiber web machine provided with vacuum equipment.

Abstract: A combination of a press felt with a pressure and/or suction roll covering for a papermaking machine, including a porous press felt with a carrier structure. The pressure or suction roll covering having a circumferential groove surface structure having a groove width in the range of 0.5 mm to 1.5 mm, a distance between grooves in the range of 1.5 to 2.5 mm and a groove depth in the range of 1.5 mm to 4 mm. A percentage of an open surface relative to an overall surface of the pressure roll covering is in a range of 20% to 50%. The suction roll covering additionally having an arrangement of holes with a plurality of suction holes completely penetrating through the suction roll covering, whereby a percentage of an open surface in relation to an overall surface of the suction roll covering is in a range of 30% to 50%.

Abstract: The invention relates to vacuum equipment for a fiber web machine. The vacuum equipment includes a frame (13) arranged to be supported to the fiber web machine. The vacuum equipment also includes a wearing construction (15) adapted to the frame (13) and arranged partially open on the surface by means of several openings (14) for extending a vacuum effect out from within the frame (13) and further to a fabric (16) included in the fiber web machine and set in contact with the wearing construction (15). The wearing construction (15) is a plate construction (17), the raw material thickness s of which is equal to or smaller than the distance x between the opposite edges (18, 19) defining the opening (14). The invention also relates to a fiber web machine provided with vacuum equipment.

Abstract: The present invention is directed to an apparatus used in the formation of paper. More specifically the present invention is directed to an apparatus, system, and method for lowering the consistency or degree of density of fiber suspension on the forming table, and improving the quality and physical properties of the paper formed thereon.

Abstract: Segments, typically ceramic, for use in dewatering blades for papermaking and similar machines comprise lower surfaces to each of which at least one interlock member is bonded. The segments are installed by inserting the interlock members into a channel in an intermediate sub-assembly or base member. The members are securely attached within the channel by a suitable adhesive, or clip means to engage the interlock members, with the optional addition of an adhesive. The segments and dewatering blades, and a method of manufacture, allows for the segments to be made as flat units, without unnecessary angular surfaces, simplifies their attachment to the base, and reduces the occurrence of stress cracking or other damage to the segments. A single segment can be used in various dewatering blade types and in more than one orientation in dewatering blades, reducing manufacturing costs by unitizing construction.

Abstract: Dewatering blades for use in papermaking machines are assembled from two or more pre-finished sub-assemblies which are in turn mounted on a base member. Each sub-assembly comprises a holder, configured to receive a plurality of segments, constructed of a wear-resistant material such as ceramic, which will be located so as to be in sliding contact with the underside of a papermaking fabric. The holders are adapted for insertion into and retention in the base member, which is subsequently affixed to the papermaking machine by known means. The construction of the sub-assemblies allows for the manufacture of a full length blade from a plurality of sub-assemblies, which dramatically reduces manufacturing cost while providing for more rapid deliveries and simplified repair of damaged blades.

Abstract: This invention relates to a rail for the compliant supporting of a mesh in the region of a double mesh zone of a double mesh section of a machine for producing a fibrous web, including a movable head rail, a movable bearer rail, a fixed guide rail, a compliant pressing apparatus, and a compliant return apparatus for moving the movable bearer rail together with the movable head rail from the operating position to the resting position and for holding the two rails in the resting position. The compliant return apparatus has, spread over the length of the movable bearer rail, several movable return hoops which at the one end can be made to engage at least temporarily with the movable bearer rail and at the other end can be loaded at least temporarily by at least one return element respectively arranged between the fixed guide rail and the movable return hoop.

Abstract: A foil for paper production systems has a carrier strip and mutually adjoining plates of ceramic material. The plates are fixed to the carrier strip by way of a plurality of clips, whose free ends are latched to the plates. On their side facing the carrier strip, the plates of a ceramic material are formed with strips projecting from the latter and extending in the longitudinal direction of the carrier strip, which are formed with undercuts along their side edges, the free ends of the clips, which are oriented toward one another, projecting into the lateral undercuts of the strips projecting from the plates.

Abstract: A cover for a vacuum dewatering box that is formed from a plurality of blocks, each including a wear surface, is provided. At least some of the blocks are spaced apart to form at least one generally longitudinally oriented slot through the cover, with a shape and size of the at least one slot being determined by at least one of a location of and a shape of the blocks. Preferably, the at least one slot is formed with a zig-zag or herringbone pattern, and can be used on a suction box or Uhle box on a papermaking machine. A vacuum dewatering box having this type of cover is also provided.

Abstract: A material for dewatering elements at the wet end of a paper-making machine is disclosed. The material comprises an elastomeric polymer matrix, and a filler added to the matrix at a level of 10 to 50 percent by weight, and the material has a hardness according to Shore A between 60 and 85. The invention also relates to a dewatering element comprising such material, and to the use of such material for the preparation of a dewatering element.

Abstract: A forming section of a paper or board machine 10 in the forming section of a paper or board machine has a cover 36 having an outlet groove 20 between a suction zone 18 of circular holes and an outlet edge 40. A wire comes to the cover area from an inlet edge 38 and leaves from an outlet edge 40. The outlet groove 20 is essentially in the cross-machine direction of the cover 36. The suction zone accomplishes non-pulsating dewatering, and the outlet groove accomplishes pulsating dewatering. The non-pulsating suction zone first accomplishes good retention, and after this formation is improved on the outlet groove. When pulsating dewatering takes place in the same direction as non-pulsating dewatering and immediately after non-pulsating dewatering, the web formed has a particularly good formation potential. Potential marking caused by non-pulsating dewatering can also be removed efficiently by means of pulsating dewatering taking place on the same side.

Abstract: The invention relates to a sealing arrangement (7) against a moving fabric (4b) in a paper machine or the like. The sealing arrangement includes a stiff sealing element (9) placed on the fabric's (4b) side on the entire width in connection with a paper sheet (4a) supported by the fabric (4b). The sealing element has been arranged on a support so that the location of the sealing element with respect to the fabric (4b) can be adjusted nearer to or, correspondingly, further from the fabric. As a sealing element there is at least a single-chambered labyrinth sealing (19).

Abstract: A hydrofoil for a papermaking installation has a supporting bar and plates of a ceramic material. Either the supporting bar or each ceramic plate fixed to the latter is formed on the mutually facing sides with at least one undercut groove extending in the direction of the supporting bar over the length of the plate, and the respective other part is formed with at least one retaining strip formed approximately oppositely to the undercut groove and extending in the direction of the supporting bar. The at least one retaining strip can be clamped in the at least one groove.

Abstract: An arrangement is disclosed for controlling the web in a press section of a paper of board machine wherein the press section includes a press nip and two fabrics arranged to travel through it. In addition, the press section includes a suction roll with a suction apparatus fitted after the press nip. The suction apparatus includes at least one suction case, which is arranged in a closing throat and/or an opening throat formed by one of the fabrics and the suction roll. The suction case is also arranged before and/or after the suction roll in the edge of the fabric in order to create a suction effect in a narrow edge area of the web.

Abstract: A dewatering member for a paper or board machine has a composite body (13) and a hard surface layer (12). The composite body (13) is manufactured in a pultrusion process. An adhesion layer (11) is formed on desired outer surfaces of the composite body (13) such that reinforcements passed to the adhesion layer (11) have been passed to the pultrusion process through a separate resin bath, to which an adhesion improving agent has been added such that the hard surface layer (12) can be applied directly onto it, and reinforcements forming the inner portion of the composite body (13) have been passed to the pultrusion process through a second resin bath. The composite body (13) is coated with a hard coating layer (12) produced by thermal spraying, and the coating (12) is ground.

Abstract: A supporting and wiping device is assigned to the machine wire in a paper-making system. The supporting and wiping device has supporting and wiping strips firmly held on a carrying frame or the like and extending transversely with respect to a direction of movement of the machine wire. The carrying frame has two carrying beams aligned parallel to the supporting and wiping strips and two-part transverse webs arranged between said beams and capable of being fixed to the latter, on the one hand the transverse webs and on the other hand the supporting and wiping strips being formed with mutually associated recesses and projections, by way of which the transverse webs and the supporting and wiping strips can be connected to one another and clamped by displacing the two parts of the transverse webs with respect to each other.

Abstract: An apparatus for the treatment of, in particular for vacuum action upon, the at least one wire or at least one felt band in a papermaking plant. The wire or felt band is moved in circulation by the apparatus, which, if appropriate, is connected to a vacuum source. The apparatus has a carrying device assigned to the wire or felt band and a multiplicity of supporting elements are disposed at a distance from one another.

Abstract: A wire foil for a paper production installation has a supporting strip and plates fixed to the latter. The plates are mutually adjoining ceramic plates. The supporting strip and the plates of ceramic material are formed, on the mutually contacting surfaces, with mutually facing recesses, in which connecting elements are anchored. The connecting elements are fixed in the recesses in the plates of ceramic material by a form fit, and plates located beside one another are fixed to the supporting strip by at least one common connecting element extending over the joint.

Abstract: Apparatus for treating a fibrous web that includes at least one supporting surface arranged to support a surface of the fibrous web, and at least one sealing device positionable adjacent a surface of the web opposite the surface of the web supported by the at least one supporting surface. The at least one sealing device includes a positionably adjustable sealing element. A distance between the positionably adjustable sealing element and the surface of the web opposite the surface supported by the at least one supporting surface is adjustable.

Abstract: A fabric support element for a papermaking machine has improved fluid drainage means, comprising openings which can include flow-through vents. The element can comprise an impingement shoe for a forming section of a papermaking machine. The openings can be defined by a plurality of laminar segments, at least some of which define a paper side surface of the element, and which segments can be spaced apart by additional laminar segments or other spacing means. Laminar segments for use in the element, a method of constructing the element, and a papermaking machine, or a forming section thereof, including the element are also provided.

Abstract: A process, and an apparatus, for improving sheet properties in a twin fabric paper making machine forming section whereby pressure pulse generation in the stock can be controlled. The pressure pulses are controlled by mounting a vacuum assisted skimmer blade (15) supported by an adjustable resilient support means (18) so that its height can be altered, and so that it can respond to transient changes in the stock layer thickness. The resilient and adjustable support means (18) itself is supported by a vacuum drainage box (10), which serves to capture at least the major proportion of the fluid skimmed of by the skimmer blade (15). This apparatus the position of the skimmer blade (15) to be altered in two ways without stopping the paper making machine. The skimmer blade (15) can be located either so that it is out of contact with the forming fabric (3), or so that it can be in contact with the forming fabric.

Abstract: An adjustable resilient blade support for use in the forming section of a papermaking machine. The blade support is adjustable, both to allow the attached blade to be moved from a position where it is out of contact to a position where it is pressed into contact with the adjacent forming fabric, and to permit adjustment of the blade orientation relative to the surface of the forming fabric. The blade support is also resilient, and thus allows the blade to respond to transient localized changes in the path of the forming fabric with which it is in contact. The adjustable resilient blade support of this invention is thus of use in an open surface forming section, and also is of use in forming sections in which two forming fabrics are used.

Abstract: A roll for use in a paper machine includes a roll shell having an inner periphery. A roll cover is positioned around the roll shell and has an outer surface. The roll cover and/or the roll shell include at least one main flow channel positioned radially inward from the outer surface and radially outward from the inner periphery. The roll cover includes at least one secondary flow channel in communication with each of the outer surface and at least one main flow channel.

Abstract: A system for making a paper web has at least one endless wire which is moved over load bearing and guide rolls. A pulp supply apparatus applies pulp to the wire. Suction devices and ceramic scrapers are arranged along the wire. There may also be present devices for the application, controlled by valves, of a coolant, in particular water, to the wire and the scrapers. At least some of the scrapers are constructed with at least one temperature sensor, whose output is connected to a display device or to a control unit.

Abstract: An apparatus for a paper-making installation with at least one wire supports the wire wipes off the water emerging from the paper pulp or paper web on the wire and passing through the wire. The apparatus is formed with a plurality of supporting and wiping elements of ceramic material located at intervals from one another in the direction of movement of the wire. The upper surfaces of the elements come into contact with the wire. A large number of supporting and wiping elements is provided, and they are located in a plurality of rows that extend over the width of the wire. Each row has a plurality of elements.

Abstract: A variable frequency foil (VFF) box assembly and mechanisms for moving individual foils/foil beams and individual foil beam sets relative to each other to adjust the frequency of a paper making machine, and method of use are provided. The VFF box assembly allows for continuously and uniformly adjusting the pitch distances of individual foils within foil sets over a finite range, and also adjusting the distance between foil sets during the continuous operation of a paper making machine. Also provided is a variable frequency assembly comprising a combination of dewatering elements such as one or more foil elements and table rolls, a multi-surfaced foil element, and/or an adjustable angle foil element.

Abstract: A variable frequency foil (VFF) box assembly and mechanisms for moving individual foils/foil beams and individual foil beam sets relative to each other to adjust the frequency of a paper making machine, and method of use are provided. The VFF box assembly allows for continuously and uniformly adjusting the pitch distances of individual foils within foil sets over a finite range, and also adjusting the distance between foil sets during the continuous operation of a paper making machine. Also provided is a variable frequency assembly comprising a combination of dewatering elements such as one or more foil elements and table rolls, a multi-surfaced foil element, and/or an adjustable angle foil element.

Abstract: The present invention is a machine for manufacturing a fibrous web from a fibrous suspension, with a sheet forming area that exhibits at least one suction box, which includes a main box with at least one suction box cover that is formed from at least two drainage elements that run laterally to the machine's running direction, border a suction slit, and each has one main body and at least one ceramic. The present invention is identified by the fact that at least one drainage element and/or one format slide exhibit at least one removable edge piece in which is integrated at least one temperature sensor in order to measure the temperature in the ceramic and/or the temperature at an adhesive point between the ceramic and the associated main body and/or the temperature in the main body. The present invention is furthermore a process and a system for monitoring a drainage element.

Abstract: The arrangement is for use within a machine for at least one of making and processing at least one of paper, cardboard and tissue. The arrangement includes a first unit, a support piece and at least one clamping device. A first unit has a shaped part together with a wear part, the shaped part having a part underside. The part underside has an underside length, the shaped part displaying a part contour upon the part underside along substantially all of the underside length. A support piece interlocks with the shaped part, the support piece having a support piece top and a corresponding top length. The support piece has a piece contour upon the support piece top along substantially all of the top length, the piece contour being substantially complimentary to the part contour. At least one clamping device is operatively positioned relative to both the part contour and the piece contour.

Abstract: Apparatus for treating a fibrous web that includes at least one supporting surface arranged to support a surface of the fibrous web, and at least one sealing device positionable adjacent a surface of the web opposite the surface of the web supported by the at least one supporting surface. The at least one sealing device includes a sealing element and a holder structured and arranged to hold and to enable lateral sliding movement of the at least one sealing device cross-wise to a web travel direction.

Abstract: A forming board for a papermaking machine includes: a support; a transversely-extending lead blade attached to the support, the lead blade; a plurality of transversely-extending trailing blades; a mounting unit for each of the plurality of trailing blades, the mounting unit being attached to a respective trailing blade and to the support such that the upper surfaces of the lead blade and the trailing blades are substantially coplanar and such that gaps are defined between the trailing edges and leading edges of adjacent blades, the gaps being of substantially uniform width; and a drive unit attached to the mounting unit and to the support, the drive unit being configured to drive the trailing blades simultaneously to different longitudinal positions relative to the support, wherein the gap widths vary but remain substantially uniform.

Abstract: Suction box in a paper machine including a vacuum chamber, a deck or a number of substantially U-section holders open toward a wire and ribs arranged in the deck or the holders so that they can be loaded against the wire. At least in a running situation, the deck of the suction box is curved or the ribs are arranged to provide a curve run of the wire so that the wire tension of the curved run over the deck or ribs serves to lower a normal force which is produced by the vacuum present in the suction box and which is effective between the wire and the deck or ribs.

Abstract: A reversible foil blade for a papermaking machine providing for a plurality of activity zones wherein the drainage and sheet activity characteristics of the blade can be independently and separately predetermined, established, and controlled. The shape of the foil blade is designed to provide both leading and trailing edges that each form an angle less than 90° with the horizontal, the paper sheet and conveying forming fabric, thereby providing different drainage and sheet activity characteristics when the blade is reversed and installed in a reverse orientation.

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: The current invention relates to a machine for the production of a fiber web, specifically a paper or cardboard web, from at least one fiber stock suspension comprising at least one porous belt, specifically a wire belt, a felt belt, or similar belt, running continuously in the direction of web travel. Further including at least one suction box, including a closed box that can be connected to a vacuum source. On its upper surface that is in contact with the belt, a multitude of cover strips are mounted at certain distances from each other and vertical to the direction of travel L of the belt, forming suction slots. At least one suction box cover strip at which a pressure differential exists due to various prevailing ambient pressures, and has a width making contact with the wire, viewed vertically to the direction of travel of the belt, and having a value factor a* of the average width of the cover strips that are contacting the wire, whereby the value factor takes on a numerical value in the range of 0.

Abstract: A device for attaching a strip cover on a dewatering box in a paper machine; including at least one connecting element extending transverse to the machine direction, to attach the strip cover to the dewatering box across the entire machine width. Fasteners secure the connecting element on the dewatering box in such a manner that it is adjustable, generally transverse to the machine direction, between a clamping position in which it presses the strip cover tightly against the dewatering box, and a release position in which the strip cover is released. At least one adjusting element is utilized for the adjustment of the connecting element, which is accessible from the operator or drive side of the paper machine.

Abstract: A variable frequency foil (VFF) box assembly and mechanisms for moving individual foils/foil beams and individual foil beam sets relative to each other to adjust the frequency of a paper making machine, and method of use are provided. The VFF box assembly allows for continuously and uniformly adjusting the pitch distances of individual foils within foil sets over a finite range, and also adjusting the distance between foil sets during the continuous operation of a paper making machine.

Abstract: Papermaking apparatus is disclosed having variable dewatering devices with moveable elements which engage the conveyor carrying paper stock and are adjustable to vary their operating characteristics. A variable pulse turbulation blade with an adjustable in-going angle is provided with a cam-operated adjustment device that maintains the blade height constant while adjusting the in-going angle to prevent fiber clumps and to provide the paper sheet with a more uniform consistency. The turbulation blade may have a plurality of flats disposed at different angles or multiple radii on its leading portion.

Abstract: A variable frequency foil (VFF) box assembly and mechanisms for moving individual foils/foil beams and individual foil beam sets relative to each other to adjust the frequency of a paper making machine, and method of use are provided. The VFF box assembly allows for continuously and uniformly adjusting the pitch distances of individual foils within foil sets over a finite range, and also adjusting the distance between foil sets during the continuous operation of a paper making machine.

Abstract: An adjustable foil apparatus for papermaking machines is described in which a pair of rigid foil members are mounted in a pair and are pivotable about substantially parallel longitudinal axes in mirror image fashion to provide selected angularity therebetween. A common operating mechanism is attached to both of the adjustable angle foils in the pair, such that actuation of the operating mechanism produces concurrent mirror image pivoting of the foils in the pair.

Abstract: Wire section, guidance device, and process of forming a web in a machine for producing a fibrous material web. The device include two revolving endless wire belts, a twin wire zone formed between the two revolving endless wire belts, and a revolving flexible support belt located in a vicinity of the twin wire zone and positioned to support at least one of the two wire belts in a support region. The flexible support belt is generally guided along an at least essentially circular cylindrical path, and the support region includes a support path having an average curvature radius that is greater than a curvature radius of the essentially circular path. The process includes supporting at least one of the two endless wire belts with the flexible support belt in a support region, rotating the flexible support belt along a generally circular path, and deflecting the support belt from the generally circular path in the support region, whereby the support belt in the support regions travels along a support path.

Abstract: A suction box in a paper machine including a vacuum chamber, a deck or a number of substantially U-section holders open toward a wire and ribs arranged in the deck or the holders so that they can be loaded against the wire. At least in a running situation, the deck of the suction box is curved or the ribs are arranged to provide a curve run of the wire so that the wire tension of the curved run over the deck or ribs serves to lower a normal force which is produced by the vacuum present in the suction box and which is effective between the wire and the deck or ribs. A method in a suction box in a paper machine, wherein a vacuum is formed in a vacuum chamber of the suction box and, during formation of the vacuum, the deck and/or the ribs is/are pressed against the wire.

Abstract: Suction box in a paper machine including a vacuum chamber, a deck or a number of substantially U-section holders open toward a wire and ribs arranged in the deck or the holders so that they can be loaded against the wire. At least in a running situation, the deck of the suction box is curved or the ribs are arranged to provide a curve run of the wire so that the wire tension of the curved run over the deck or ribs serves to lower a normal force which is produced by the vacuum present in the suction box and which is effective between the wire and the deck or ribs.

Abstract: A fabric support element for a papermaking machine has improved fluid drainage means, comprising openings which can include flow-through vents. The element can comprise an impingement shoe for a forming section of a papermaking machine. The opening can be defined by a plurality of laminar segments, at least some of which define a paper side surface of the element, and which segments can be spaced apart by additional laminar segments or other spacing means. Laminar segments for use in the element, a method of constructing the element, and a papermaking machine, or a forming section thereof, including the element are also provided.