Abstract: An improved conveying roller for a web or a sheet in a paper converting machine comprises a first cylindrical tubular body having a plurality of radial holes arranged in substantially longitudinal rows, and a second fixed tubular body arranged coxially within the first cylindrical tubular body. The first cylindrical tubular body is capable of rotation relative to the second fixed tubular body. Slidable sealing elements are positioned between the first cylindrical body and the second fixed tubular body to define at least one suction or vacuum chamber. The chamber is suitable for being brought selectively in communication with at least one row of the radial holes during the relative rotation of the bodies.

Abstract: A roller has a movable roller sleeve and a positive-pressure or negative-pressure zone inside the roller sleeve. The zone is sealed outwardly by a sealing installation with at least one sealing strip. The sealing strip in the radial direction of the roller is movable from the roller toward the inner side and away therefrom and the sealing strip has a lubricant outlet opening connected to a supply line for delivering lubricant to between the inner side of the roller sleeve and the sealing face. The supply line includes one part running within the sealing strip and one part running outside the sealing strip but within the roller. The part of the supply line within the roller, on its length which is routed outside the sealing strip, includes a first portion that is longer than a second line portion. The second line portion is more flexural than the first line portion.

Abstract: A vacuum roll includes an inner rotor, an intermediate stator, and an outer shell roll. The inner rotor has open and closed portions and is adapted to rotate within the intermediate stator which is rotationally fixed and also has open and closed portions. The outer shell roll has open and closed portions and is adapted to move around the intermediate stator. Together the inner rotor and the intermediate stator define an internal rotary valve interface adapted to control fluid communication between the interior chamber and the outer shell.

Abstract: The invention relates to a suction roll seal strip and a method for manufacturing it from a mixture, which mostly consists of nitrile rubber and graphite. A seal blank is formed from the mixture and hardened at a chosen temperature. The mixture to be hardened includes wax.

Abstract: A sealing strip of a suction roll (4) for a material web machine includes a longitudinal strip element (3) and a longitudinal holder (2) shaped as a U profile open in the direction of a facing surface (41). An element first layer (31) is an easily adjusting material and a second layer (34) is a stiffer material in the loading direction than the first layer. The strip element may be loaded so it or its edge does not substantially bend in the direction of movement of the facing surface. To optionally reduce the effect of abrasion: an inner mantel surface is treated by grain blasting, thermal injection coating, chemical or electro-chemical precipitation coating and/or polymer-based coating; and/or a lubricant or additive is fed between surfaces abrading against each other; and/or at least part of suction holes in a wall of the mantel are broached (71).

Abstract: A device for conveying sheets through a printing machine, in particular through an ink jet printing apparatus, permits adaptation to different printing material thicknesses and ensures reliable transport. The conveying device has a conveyor belt which runs over deflection rollers and guide elements and to which sheets can be fed individually one after another. An apparatus enables setting the distance between the surface to be printed of a sheet and a print head. At least three conveying segments are arranged one after another, the print head being fastened to a holding device opposite a central conveying segment. Each conveying segment is assigned at least one guide element and it is possible to adjust the height of the guide element opposite the print head in accordance with the thickness of the sheets.

Abstract: A paper machine suction roll has a perforated shell (10) and a static suction box (11) sealed against the inner surface of the shell (10) to create a suction zone (11a) on the roll surface as it rotates. Holes (14) extending through the shell (10) are placed at distances (b1) of varying magnitude from one another such that the hole pattern formed on the inner surface of the shell (10) is irregular. Each hole (14) has a surrounding countersink situated at regular intervals (a) from one another forming a regular countersink pattern on the outer surface of the shell (10). A conventionally drilled suction roll produces very powerful noise peaks at certain multiples of rotation frequency. When the position of the holes is changed at random in particular in the circumferential direction, regular periodicity disappears and the sound produced is a less disturbing humming-type sound.

Abstract: The invention concerns a seal construction for a suction roll in a paper machine. The seal construction (10) comprises a substantially U-section holder (12) open towards the inner face (3) of the roll mantle, a seal which is mounted in the holder, which is placed in the axial direction of the roll, and which consists of a frame part (13) of the seal fitted in the holder (12) and of a wear part (11), which is fix to the frame part and which is placed against the inner face (3) of the roll mantle, and which seal construction also comprises loading means, such as a loading hose (15) or equivalent, by whose means the seal can be shifted in the holder (12) against the inner face (3) of the roll mantle.

Abstract: A suction box comprises a fixed frame part (11) and a lid part (12) disposed in the frame part (11) to be movable. The moving lid part (12) moves relative to the fixed frame part (11) with the aid of gravity or with the aid of expansion members (15a, 15b, 15c) positioned in link points between said two parts (11, 12). On the moving lid part (12), sealings (13a, 13b, 13c) are fitted, wherewith the suction box is sealed against the inner face of a shell (14) of a suction roll. In the link points between the fixed frame part (11) and the moving lid part (12), locking means (20) are disposed, wherewith the moving lid part (12) can be locked relative to the fixed frame part (11) in a desired position.

Abstract: Sealing device and process for laterally sealing at least one excess pressure or vacuum zone adjoining a moving surface in a paper-making machine. The sealing device has at least one sealing element arranged in a receptacle area of a holder and is movable relative to the holder for placement against the moving surface. The receptacle area serves as a clamping receptacle and the sealing element is acted upon with a clamping force through clamping surfaces of the clamping receptacle.

Abstract: A sealing device and process for laterally sealing at least one overpressure zone or underpressure zone adjacent to an actuating surface in a paper-making machine. The sealing device has at least one sealing element arranged movably at least locally in an intake area of a support. The sealing element is loaded with a sealing or opposing force in order to place it against the actuating surface. A stopping element is fixed at a distance from the actuating surface which limits the seating motion of the sealing element.

Abstract: A sealing construction for loading a seal against a suction roll in a paper machine includes a seal having a wear surface, side surfaces and a lower surface. The seal is fitted from its holder to the structure of a suction box which is inside the suction roll. The seal essentially covers the whole operating length of the suction roll, extending from its wear surface to the inner face of the mantle of the suction roll. The seal is moveable in the direction of the radius of the suction roll in the holder by a pressure effect that is applied directly onto the lower surface of the seal. Negative pressure or vacuum can be applied during operation to draw the seal into its holder to reduce seal wear.

Abstract: A high pressure shower system for cleaning perforations in a suction roll of a paper-making machine is disclosed. An elongated header pipe is mounted to the outside of the suction box and is fitted with a plurality of spaced high pressure nozzles directed at and in close proximity to the inside surface of the suction roll. The header pipe is driven in a longitudinal reciprocating manner providing complete spray coverage of the suction roll perforations. The water supply conduit to the header passes through the inside of the suction box which has a sealed slot opening to accommodate the reciprocal movement of the header.

Abstract: Suction box for a machine producing a web containing cellulose fibers, said suction box being placed inside a rotating suction roll (2) provided with a perforated jacket (1), said suction box (3) comprising a suction chamber (4) having a suction inlet (6) placed against the interior surface (5) of the suction roll and a suction connection (7) for creating a negative pressure in the suction chamber and sucking water through the perforations (8) in the suction roll into the suction chamber. The suction inlet (6) is provided with ribs (10) laid in a direction transverse to the direction of rotation (9) of the suction roll (2) and forming suction slits (11) in the longitudinal direction of the suction roll near the interior surface (5) of the suction roll.

Abstract: Wear indicators (80) are formed in the seal strips (52, 54) of a suction box (44) of a suction roll assembly (15) of a papermill. The wear indicators include a space such as a bore (74) formed in the seal strip, extending through the arcuate seal surface (68, 70), and extending inwardly of the seal strip. The bores are filled with colored fill material, with red fill material (81) located deep in the bore, yellow fill material (82) placed on top of the red fill material, and green fill material (83) placed on top of the yellow fill material and reaching the seal surface of the seal strip. As the seal strip wears during the operation of the papermill, the colored fill material will be visible upon inspection of the seal strips, informing the inspector of how much farther the seal strips can be urged outwardly into engagement with the suction roll (22) in response to inflation of the inflatable biasing tubes (56, 58 and 60).

Abstract: A method for removing air from a suction roll/suction cylinder and a suction roll/suction cylinder including a roll mantle, end flanges connected to the roll mantle and axle journals for revolvingly supported the roll mantle. The mantle has numerous perforations, holes or equivalent openings passing therethrough. The suction roll/suction cylinder is connected to a suction duct that passes onto the interior of the roll/cylinder and transfers a vacuum force therein. Air is drawn or sucked through the perforations into the interior of the roll mantle so as to press a paper web toward an outer face of the roll mantle. The suction roll/suction cylinder has a system of suction pipes connected with the suction duct and including at least one suction pipe into which air is guided and/or sucked from the vicinity of the inner face of the roll mantle of the roll/cylinder.

Abstract: A sealing construction for a suction box of a suction roll in a paper machine and a method for sealing a suction roll in which a seal is arranged in a holder and loading members, preferably at least one loading hose, are arranged between the holder and the seal. The seal is pressed against an inner face of the roll mantle of the suction roll by the pressure of a medium that has been supplied into the loading hose. Locking devices are situated between the seal and the holder to lock the seal in a desired position.

Abstract: A vacuum/blowing sheave on the end of the lower calender roll of a papermaking machine threads a tissue web tail from a Yankee dryer to a take-up reel through the calender. The sheave is positioned adjacent to the outlet of the threader tube from the Yankee dryer, where the vacuum portion of the sheave picks up the tail and transports it towards the take-up reel. Upon transiting the closed nip of the calender, the tail is blown by a short blowing section on the sheave into the tube threader which leads to the take-up reel.

Abstract: A hollow cylinder exhibits an internal body, which forms a sickle-shaped space by means of a partial cylindrical surface arranged eccentrically to the hollow cylinder, with a smaller radius than its internal radius. In this space there is created a vacuum on rotation of the hollow cylinder. By This means air is sucked out of the area through the boreholes of the hollow cylinder, where a web of material wraps the hollow cylinder. This leads to a firmer adherence of the web on material to the hollow cylinder.

Abstract: A gap former in a paper machine, comprising a lower wire loop (10) and an upper wire loop (20), which together define a substantially horizontal twin wire forming zone, which comprises the following web forming zones (a), (b) and (c): (a) In the area of the forming gap (G), a first suction zone (11a) placed inside the first forming roll (11), and immediately thereafter a second suction zone (11b) is placed in forming roll (11). The suction zones (11a, 11b) are placed in the first upper quarter of the first forming roll (11) at the side of the forming gap (G). The levels of negative pressure (P.sub.1, P.sub.2) in the suction zones are adjustable. (b) A forming shoe (12), which is provided with an open guide deck (26), the interior space in the shoe being divided into at least two subsequent suction chambers (12a, 12b, 12c), the levels of negative pressure (P.sub.a, P.sub.b, P.sub.c) effective in said suction chambers being arranged to be adjustable, preferably separately adjustable.

Abstract: A hollow cylinder exhibits an internal body, which forms a sickle-shaped space by means of a partial cylindrical surface arranged eccentrically to the hollow cylinder, with a smaller radius than its internal radius. In this space there is created a vacuum on rotation of the hollow cylinder. By this means air is sucked out of the area through the boreholes of the hollow cylinder, where a web of material wraps the hollow cylinder. This leads to a firmer adherence of the web on material to the hollow cylinder.

Abstract: A felt turning roll for use in the dryer section of a papermaking machine has a stationary shaft extending outwardly from at least one end of a perforated roll shell. The stationary shaft extends inwardly from the end of the roll for only a short distance which is substantially less than half the length of the face width of the roll. The stationary shaft is bored to permit a source of sub-atmospheric air pressure to be applied to its exterior portion. The inner portion of the shaft has a valve, a seal near its inner end between it and the roll shell, and openings to permit the exposure of sub-atmospheric air pressure within the roll shell on either side of the seal. The use of short stationary shafts eliminates the center shaft which otherwise would extend for the length of the roll.

Abstract: A sealing strip and joint for a papermaking machine suction roll is disclosed which includes in combination a stationary suction box and a perforated cylindrical shell which rotates around the stationary suction box disposed centrally within the cylindrical shell. The suction box includes slots constructed near at least two outside edges of the suction box extending across the width of the suction box. A composite seal strip extends throughout the width of each slot which includes a plurality of elongated seal strips jointed together end-to-end in the slots. A plurality of joints are spaced along the length of the composite sealing strip defined by ends of adjacent seal strips joined together. The joints include a first end section of a first strip and a second end section of a second strip mated together in an abutting relation. The first end section and second end section have interfitted radius surfaces which mate against each other against the rotation of said cylindrical shell.

Abstract: The present invention concerns a device for generating negative pressure inside a cylindrical roll mantle of a revolving roll. The roll has a roll mantle provided with through-holes, grooves or equivalent apertures and confining a suction chamber in the interior thereof, in which a negative pressure can be generated by suctioning air out of the suction chamber. A suction flow directed towards the suction chamber thereby prevails in the holes, grooves or equivalent apertures of the roll mantle. At least one rotor blower or equivalent is attached to the roll to revolve along with the roll, with an intake side of the rotor being connected to the suction chamber of the roll. The movement of rotation of the roll thereby produces rotary movement of the rotor or equivalent, which in turn generates negative pressure in the suction chamber. Thus, in the arrangement in accordance with the present invention, external equipment of negative pressure or a separate piping system is not needed.

Abstract: Sealing strips mounted on an internal vacuum box and engaged with the internal surface of a perforated rotatable shell forming a suction roll in a conventional paper making machine are contructed from a body portion of organic material having an outer surface forming an interface with an inner surface of the shell, and a PTFE inlay strip exposed at the outer surface of the sealing strip for rubbing against the interior surface of the shell and smearing across the outer surface of the sealing strip to reduce friction and improve lubrication at the interface.

Abstract: A method for applying a negative pressure over a sector of an air-pervious mantle of a roll includes providing a suction chamber within the pervious roll mantle which extends over a suction sector of the roll, directing air jets away from the suction chamber at the outermost edge portions of the suction chamber, the air jets causing air currents to be ejected from the suction chamber at the outermost edge zones thereof, the air currents thereby producing air seals at the outermost edge zones of the suction chamber without the use of contact-type sealing elements and at the same time, at least partly, providing a negative pressure in the suction chamber. A suction roll includes blow nozzles for directing air jets away from the suction chamber substantially parallel to the tangent of the roll mantle proximate to the blow nozzles. The inlet sides of the blow nozzles are connected to a pressure chamber situated within the roll mantle, the pressure chamber adapted to be connected to a pressure source.

Abstract: A rotary drum filter of the pipe machine type has a stationary vacuum breaker valve-discharge elbow assembly at the discharge end of the drum which defines a streamlined, smoothly curving, and substantially unobstructed discharge flow passage with gradually changing flow cross sectional areas. The valve member includes a valve closure segment at its inlet end that is structurally connected to the annular outlet end flange and sealing rim by an extension segment which forms a continuation of the valve segment. The cross sectional shapes and areas of the flow passage at the valve outlet and discharge elbow inlet are the same, but the area gradually increases in a direction toward the outlet of the elbow, and the shape gradually changes from a segmented circle to a full circle in the same direction.

Abstract: A vacuum breaker valve-discharge elbow assembly for a rotary drum filter of the pipe machine type is adjustably mounted to the drive gear housing for the filter via a separate mounting plate. A valve flange comprising a separate clamping ring clamps the valve to the mounting plate. The mounting plate is in turn transversely and axially adjusted on the gear housing via adjusting bolts to accurately seat the valve within its valve housing in the drum. The discharge elbow is then secured to the mounting plate independently of the valve. The valve can be rotationally adjusted without limitation on the mounting plate without disturbing the prior axial and transverse adjustment of the plate and valve by loosening the clamping ring to enable rotation of the valve along close-tolerance guide surfaces of the mounting plate. Cooperative calibration plate and pointer on adjacent surfaces of the valve body and packing collar facilitate precise angular adjustment of the valve.

Abstract: A vacuum breaker valve-discharge elbow assembly for a rotary drum filter of the pipe machine type is adjustably mounted to the drive gear housing for the filter via a separate mounting plate. A valve flange is secured to the mounting plate. The mounting plate is in turn transversely and axially adjusted on the gear housing via adjusting bolts to accurately seat the valve within its valve housing in the drum. The discharge elbow is then secured to the mounting plate independently of the valve. The valve can be rotationally adjusted on the mounting plate without disturbing the prior axial and transverse adjustment of the plate and valve by providing slotted fastener access holes on the valve flange and close-tolerance valve flange guide shoulders on the mounting plate. Cooperative calibration plates on adjacent valve flange and mounting plate surfaces facilitate precise angular adjustment of the valve.

Abstract: The web forming, guiding and/or transferring cylinder in the wire section of a papermaking machine has a deformable foraminous shell which is made of filamentary material and the end portions of which are clamped to rigid rotary ring-shaped end walls. The cylinder surrounds a rigid stationary back support which engages the internal surface of the shell opposite that portion of the external surface of the shell which contacts the web. The back support has grooves and/or ports which convey expelled liquid from the web into a suction chamber for admission into the saveall of the papermaking machine. One of the end walls is movable axially to change the axial tensional stress upon the shell. The back support has a convex external surface whose center of curvature may but need not be located on the axis of the cylinder.

Abstract: Galvanic electrodeposition of copper onto a cast iron vacuum box from a rubber covered brass couch shell carrying a non-conductive papermakers forming wire may be prevented by electrically connecting the brass couch shell with a sacrificial anode of more noble metal than brass by means of a conductive metal shoe pivotally secured to but electrically insulated from said vacuum box so as to run in conductive contact with the inside surface of said shell.

Abstract: A twin wire paper machine having structure for controlling the common path taken by the wire. A web-carrying wire and a web-pressing wire having a common path extending upwardly from a lower forming roll to an upper couch roll with the web which is formed being compressed between these wires while they travel along this common path, the web-carrying wire continuing to transport the web beyond the common path of the two wires. The forming and couch rolls define between themselves a space situated on one side of a straight line which is tangent to both of these rolls and which contacts the common path of the wires at the regions of these rolls.

Abstract: The belt press is constructed with a rotatable cylinder, a guide belt to confine the material between the belt and cylinder, and a press member for pressing the belt towards the cylinder to remove water from the confined material. The press member has a curved face slightly spaced from the belt as well as a pressure chamber which delivers a pressurized medium, such as water or air, against the belt over the face of the press member.