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: An apparatus and method for retaining individual sheets of substrate in a curved configuration during coating or printing is disclosed.

Abstract: A web is formed between two wire loops (13, 14), in a wire section of a paper or board machine, in connection with which dewatering elements (12, 17, 15, 28) are placed and in which water is drained from a stock suspension from between the two wires (13, 14). In the region of a twin-wire zone, a suction roll (15) is placed within one wire loop and a suction box (16) having a curved surface is situated in opposed relationship with the suction roll (15) on the wire loop. After the suction box (16), the web is guided, due to the effect of a vacuum of the suction roll (15), forwards on the surface of the wire loop of the suction roll (15).

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: An improved system, apparatus and method is disclosed for transferring a running web from a first carrier fabric to a second carrier fabric in the manufacture of webbed products, such as tissue, paper toweling, and the like. A multi-stage vacuum process applies a vacuum to the running web. One or more auxiliary units apply a vacuum to one or more edge portions of the running web. The apparatus provides for a reliable and efficient transfer of the running web among carrier fabrics, in which the carrier fabrics may include topographical features upon their surface.

Abstract: The invention relates to a roll for a paper or board machine comprising axle journals on whose support the roll is arranged to revolve, end flanges with which the axle journals are connected, and a mantle which is connected with the end flanges. The mantle is provided with a number of openings extending through the mantle and/or recesses formed into the outer surface of the mantle, which openings and/or recesses form a regular pattern. Solid connecting portions in the outer surface of the mantle around said openings and/or recesses are opened so that, from each opening and/or recess, there is a connection, provided in the form of a groove or an additional recess extending into the outer surface of the roll mantle, with at least each of the openings and/or recesses adjacent to it.

Abstract: Draw rollers for striplike materials (especially paper or cardboard strips, plastic or metal foils), having a sheath (1) that can rotate around a fixed inner component, whereby said sheath is provided with air holes along the entire surface thereof, are already known per se. A vacuum chamber (8) is arranged in the winding area of the strip. Said vacuum chamber (8) can be subjected to an underpressure. According to the invention, another vacuum chamber (8) is arranged inside the sheath (1) in the running direction of said strip (2) directly in front of the vacuum chamber (8), whereby the underpressure in the second vacuum chamber is greater than the underpressure in the first vacuum chamber (8) and is independent thereof. The upstream second vacuum chamber (8) enables the separating layer of air adhering to the strip (2) to be suctioned in a targeted manner, whereby the contact surface of the strip (2)/roller remains large enough to transmit high drawing forces.

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 (bi) 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 relates to a roll for a paper or board machine comprising axle journals on whose support the roll is arranged to revolve, end flanges with which the axle journals are connected, and a mantle which is connected with the end flanges. The mantle is provided with a number of openings extending through the mantle and/or recesses formed into the outer surface of the mantle, which openings and/or recesses form a regular pattern. Solid connecting portions in the outer surface of the mantle around said openings and/or recesses are opened to that, from each opening and/or recess, there is a connection, provided in the form of a groove or an additional recess extending into the outer surface of the mantle, with at least each of the openings and/or recesses adjacent to it.

Abstract: Device for handling a material web that includes a suction roll having a perforated jacket, and a porous support belt guided over the suction roll between a take-on region and a lift-off region. A surface of the porous support belt is adapted to guide the material web and the surface adapted to guide the material web is arranged away from a surface of the suction roll. The suction roll includes suction zones adjacent to an inner side of the perforated jacket, such that a first suction zone, arranged in the take-on region, is coupled to a vacuum source, and a second suction zone, arranged in the take-off region, is coupled to the vacuum source through the first suction zone. One of an outer web holding box and a suction tube is positioned subsequent to the take-off region, relative to a web travel direction, and is arranged to be suctioned by the second suction zone.

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 method in a paper machine for transferring a paper web from a wet wire in a former section to a pick-up fabric or an equivalent transfer fabric of a press section, including the steps of forming a pick-up point on the wet wire and separating an edge strip from at least one edge of the web prior to the pick-up point by means of at least one cutting device. The method further includes separating the web from the wet wire and passing the web onto the pick-up fabric at the pick-up point. The method also includes applying a pressure difference to the at least one edge strip through the wet wire or the pick-up fabric at or after the pick-up point to cause the at least one edge strip to either follow the wet wire or become separated from the pick-up fabric after the pick-up point and to be placed in a broke system arranged beneath the paper machine.

Abstract: A machine for manufacturing a continuous material web, in particular a paper or cardboard web, with at least one perforated cylinder sleeve and a suction roll exhibiting a manhole around which the material web is guided preferably with the aid of a transport band, whereby the interior of the suction roll can be put under a vacuum and is subdivided into at least two sections by a partition wall that is arranged essentially perpendicular to the rotation axis of the suction roll, wherein the partition wall is subdivided into sections and/or is manufactured of a flexible material and can thereby be inserted through the manhole and into the roll interior.

Abstract: A suction roll for a paper machine or the like including a perforated annular roll shell which is rotatable. A stationary suction box inside the roll shell with respect to which the shell rotates. The suction box is defined between two circumferentially spaced sealing ledges at the roll shell. A noise dampening chamber on the downstream side of the suction box defined by a further sealing ledge at the roll shell. A conduit communicating to the noise damping chamber to allow increased pressure in the chamber which reduces noise. At least one of a snifter valve, a suction blower, an air pump and a water pump communicating to the conduit for selectively adjusting the pressure in the noise damping chamber for damping roll noise.

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 pick-up roll apparatus is disclosed for picking up a tail of a web from a forming wire and for transferring the tail to a press felt wrapping around a portion of the apparatus. The apparatus includes a perforate rotatable shell which is disposed adjacent to the forming wire, the shell having a first and a second end. A stationary core is disposed within the shell, the core defining a tail box which is bounded by the shell. The tail box is disposed adjacent to one of the ends of the shell and is selectively connected to a source of partial vacuum such that when the tail of the web is cut on the forming wire, the tail is drawn from the forming wire onto the press felt which wraps around the rotatable shell. The core also defines a downstream chamber which extends between the first end and the second end of the shell.

Abstract: The invention concerns a suction roll (10) for a paper making machine, on which the paper web is pressed towards the outer face of the roll mantle. The suction roll (10) is divided, in the axial direction of the roll, into at least three vacuum spaced (A.sub.1, A.sub.2, A.sub.3). In the interior of the suction roll (10), there are at least two partition walls (17a, 17b), by means of which the suction space (13) is divided into separate zones of negative pressure. The lateral vacuum spaces (A.sub.1, A.sub.3) in the suction space can be subjected to a higher negative pressure than the vacuum space (a.sub.2) in the middle area of the roll, whereby the profile of negative pressure is formed such that the negative pressure increases across the width of the roll towards the lateral areas. The invention also concerns a method for producing a desired pressure profile for a suction roll.

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: In the drying section of a paper or board machine, a web travels in a meander-like fashion around drying cylinders and it is provided with ducts for delivering web-run stabilizing suction into the drying section. At least one cylinder is provided with ducts for delivering suction in the interior of a drying cylinder, the jacket of the cylinder being provided with flow paths communicating with the duct for delivering suction outside the cylinder both in a sector in which web runs around the jacket of the cylinder and in a sector in which the jacket of the cylinder is unoccupied by the run of the web.

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 method in a drying group or groups provided with a single-wire draw in a multi-cylinder dryer of a paper machine in the draw of a web. The multi-cylinder dryer comprises drying cylinders heated by means of steam or equivalent, with the web being pressed by a drying wire against the cylinder faces of these drying cylinders. The multi-cylinder dryer has leading or lower cylinders on which the web runs outside the drying wire which is, for example, a felt. The leading cylinders or rolls are provided with holes passing through a mantle of the leading cylinders or rolls, these holes being fitted to open into an inner space of negative pressure within the leading cylinder or roll and to open, at an opposite end, into grooves provided on a mantle face of the rolls. The negative pressure inside the roll is arranged to be transmitted to the grooves provided on the outer face of the roll mantle, so that an adhesion force is applied to the web through the grooves.

Abstract: A guide roll for a porous belt, for instance for the drying wire of a paper machine, is described. A perforated roll shell rotates about a stationary air guide box. The guide box has two air chambers which extend across the length of the guide roll. One air chamber serves the discharge of blowing air and the other air chamber serves the intake and removal of suction air. Contained between the air guide box and the roll shell is an annular space in which a blowing zone and a suction zone are defined by longitudinal seals. Considering that blowing air and suction air may have different temperatures, the two air chambers of the air guide box are movable axially relative to each other.

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 vacuum roll transfer apparatus is disclosed for drying a web extending through a single tier dryer section of a paper machine. The apparatus includes a rotatable perforate shell having a first and a second end. A stationary duct is disposed within and along the length of the shell between the ends of the shell. The duct is connected to a source of partial vacuum and the shell defines a plurality of holes along the length thereof such that is use of the apparatus, when the duct is connected to the source of partial vacuum, a partial vacuum is generated within a chamber defined between the shell and the duct. A flow restricting arrangement is disposed within the duct for generating a greater vacuum level adjacent to at least one of the ends of the shell for facilitating threading of a tail of the web.

Abstract: Method and device in a drying group or groups provided with a single wire draw, in a multi-cylinder dryer of a paper machine for securing the threading of the web. The multi-cylinder dryer has drying cylinders heated by steam or equivalent, with the web to be dried being pressed by the drying wire into direct contact with cylinder faces of the drying cylinders. The multi-cylinder dryer also has leading cylinders or rolls on which the web remains outside the drying wire. In the area of single-wire draw, the leading cylinders or rolls are provided with a suction zone situated at a side of the service-side end of the rolls. The suction zone is provided by way of perforations passing through a mantle of the leading cylinders or rolls. The negative pressure present in an interior space in the leading cylinders is spread onto the outer faces thereof through the perforations and by way of grooves situated within the area of the suction zone and passing around the roll mantle.

Abstract: A joint dewatering zone of wires for dewatering a web to be formed in a two-wire papermachine having a first wire loop and a second wire loop, includes a first forming roll which is situated inside the second wire loop and other dewatering means which are situated after the first forming roll inside the first wire loop. The other dewatering means comprises as a combination a first suction box, a second suction box with a curved guiding surface, and a roll interposed between the suction boxes.

Abstract: An applicator for applying patches to a traveling web, such as in a bag forming machine, includes a vacuum cylinder with an outer perforated sleeve, an inner slotted sleeve and a stationary core with shaped pressure chambers for applying patches cut from a roll to the traveling web. Cutting blades are included in the perforate outer sleeve to sever patch material from a roll as the vacuum cylinder rotates. The outer perforate sleeve is replaceable with sleeves of different outside diameters to accommodate different patch locations.

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: A longitudinal wire papermaking machine is disclosed wherein the longitudinal wire is guided in a dewatering region, following a pre-dewatering path, out of a wire plane downwardly over a deflection element and then upwardly over a downwardly domed or arched dewatering element towards the wire plane. The deflection element is arranged at a spacing K=approximately 15 to 80 mm from the dewatering element. The longitudinal wire is guided at the inlet section of the dewatering region, located between its outbound or run-off location at the deflection element and its lowest deflection location, over a negative pressure zone, for instance constituted by a suction chamber, which is effective at its underside. Hence, at the inlet section there is obtained a reduction in the suspension pressure and the fiber stock suspension is guided with an approximately constant total thickness lower into the dewatering region, i.e.

Abstract: A paper making machine contains a filter or screen cylinder and an external filter or wire guided over guide rolls, the external filter or wire being trained about the filter cylinder. The stock suspension is introduced by means of a free jet-headbox between the cylinder and the external filter, into an essentially linear portion of the external filter or wire, if desired while carrying out a dewatering operation. The removal of the fiber web or fleece is accomplished directly from the filter cylinder on to a felt web.

Abstract: A pair of enclosed explosion chamber flowboxes are combined so that the top exit slice plate of the first chamber provides the lower exit slice plate of the second chamber downstream of the first chamber so that pressurized furnishes for a two-ply web are laid one on top of the other over a very short distance.

Abstract: A foraminous multi-zone wire mesh covered suction roll useful in a papermaking machine and in a multi-cylinder paper-making machine wherein the roll is divided into at least four discrete zones by generally radial divider elements and wherein at least a first zone collects water, a second zone is in an area where transfer of the wet ply takes place to a continuous carrier, a third or transition zone carries excess water in the wire mesh away from the second zone to a fourth water release zone, and wherein the carrier is intimately associated with the roll and formed ply in an area subtended by the projection of the spaced divider elements defining the second or transfer zone so that the formed wet ply in this area is in contact with the wire mesh covering the suction roll on one side and in contact on its other side with the continuous carrier and so the formed wet ply in this area is between this wire mesh and the carrier.

Abstract: Improvements in seal assembly for use in pressure or vacuum chambers or the like comprising a sealing element which may be selectively placed in sealing condition or retracted to a non-sealing condition, the sealing element having a sealing surface adapted to be urged into contact with a wall member and also a surface including portions against load members which may be loaded to urge the sealing surface into sealing condition or relaxed, and spring unit for continuously urging the sealing element away from sealing condition whereby the sealing element is in fact urged out of sealing condition when the load members are relaxed.

Abstract: A method for preventing web rewetting in a paper making machine of the type comprising a forming cylinder with an apertured or perforated periphery, with or without a foraminous belt wrapped around the cylinder, on which cylinder there is formed, during rotation of the cylinder, a paper web by a pressure slice to which paper slurry or stock is supplied, the paper web remaining on the periphery of the cylinder or belt over a major portion thereof, while water is drawn from the web by means of one or more suction boxes located within the cylinder and extending from the pressure slice to a transfer zone where the web is transferred from the cylinder or belt onto a felt or wire cloth for subsequent processing. In the remainder of the paper making machine there is provided a suction box extending over an arc from said web transfer zone to the area of said pressure slice to prevent rewetting of the withdrawn web.

Abstract: A multi-press for removing water from sheet material such as paper, comprises a suction cylinder comprising a stationary internal cylinder and a rotatable external cylinder thereon that is permeable to the passage of fluid therethrough. The stationary internal cylinder is divided into a plurality of isolated sectors of equal volume that communicate with the rotatable cylinder through slots extending longitudinally of the stationary cylinder. Separate valves individually control the vacuum in each of the isolated sectors. Equally peripherally spaced pressing cylinders press superposed webs with wet sheet material between them, against the periphery of the rotatable cylinder. The pressing cylinders are disposed one adjacent each of the slots.

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.