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: Vacuum belt conveying device for guiding a moving web, in particular a web threading strip of a paper or board web, having an air-permeable transport belt guided endlessly in a loop with an upper run and a lower run, and a device arranged within the loop for applying a vacuum to the inner side of one of the runs of the transport belt in order to hold the web firmly on the transport belt, in which the device for applying a vacuum is formed by means of at least one long-gap ejector, which in each case has an air jet injector having a large number of air outlet nozzles along the inlet side of the long gap and, on the inlet side, is positioned at a distance under the inner side of the run which is provided to hold the web firmly.

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 roll in a paper or board machine has a roll frame or center shaft (15) with bearings mounted at its ends and a groove-like surface structure (10). There is a contact between the surface structure and the center shaft so that an essentially closed structure is formed. The roll produces a vacuum that keeps the web attached to the outer surface of a fabric in the fabric wrap area of the roll circle by utilizing the boundary layer airflows of the surface structure flow and/or of the web. A dryer group has at least one contact dryer cylinder and at least one turning roll with a single fabric run arrangement.

Abstract: A soft crepe paper machine comprises a wet section with a press section having a press defined by first and second press elements forming a press nip through which a press felt runs with a paper web. A suction roll is arranged in the loop of the press felt before the press nip at a distance from the second press element, and the felt with the web thereon runs around the suction roll with a large wrap angle. A drying cylinder forms the second press element. The first press element is either a solid press roll, a suction press roll, or a variable crown press roll.

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: 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: A paper or cardboard machine press section includes sequentially arranged first, second, and third presses each having opposed first and second press members forming a press nip therebetween. A press felt is arranged in a loop and passes through the press nip of the third press. An impermeable transfer belt is arranged in a loop to receive the web from the second press and transfer it to the press felt of the third press. A wet calender defining at least one roll nip is provided between the second and third presses, and the web and the transfer belt pass through the roll nip of the wet calender. In a preferred embodiment, the roll nip of the calender is formed by a smooth press roll of the second press arranged outside the loop of the transfer belt, and a guide roll that is arranged within the loop of the transfer belt.

Abstract: Process for transferring at least a portion of a running web from a first section of a web making machine includes rotating an endless conveyor belt by driving at least one driven pulley, creating a negative pressure at an inner surface of endless conveyor belt as endless conveyor belt is guided over suction box, and guiding the at least a portion of running web onto endless conveyor belt. Process also includes transferring the at least a portion of the running web from endless conveyor to rope section located outside of a web width, pivoting endless conveyor belt around the pivot axis to move downstream end into an area of rope section one of at and before transferring, and pivoting endless conveyor belt around pivot axis to move downstream end into an area of the at least a portion of running web and inside web width.

Abstract: An apparatus for processing a continuous web having a first side and a second side includes a plurality of rollers are arranged for cooperative rotation. The plurality of rollers are positioned to define a corresponding plurality of nips. The continuous web is processed through at least two of the plurality of nips. At least a first roller of the plurality of rollers has at least one void formed in the cylindrical middle surface. First and second sealing panels engage first and second circular ends of each of the plurality of rollers and define a chamber. A first pressure source is fluidly coupled to the chamber to pressurize the chamber. A membrane is positioned adjacent the first side of the continuous web to separate the continuous web from direct communication with the chamber.

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: 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: 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: 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: Apparatus and process for guiding a running web. The apparatus includes at least two guide rolls, which includes at least one driven roll, a suction box coupled to a vacuum source and having a wall with an aperture, an air-permeable belt tensioned over the at least two rolls, and the suction box being positioned within a loop formed by the belt. The suction box is positioned to suction a portion of the belt that is adapted to guide the running web. The apparatus also includes a vacuum control adapted to control a degree of vacuum in the suction box that includes a movable element positioned adjacent the aperture and an inner surface of the wall. The moving element is adapted to open and close the aperture, and an actuator is coupled to the movable element to effect the opening or closing of the aperture.

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 horizontal endless belt vacuum filter comprises an endless belt pierced, in its central part, with holes moving above the upper opening of a longitudinal vacuum and extending beneath the upper side of the conveyor belt. An endless filtering medium passes over guide rollers and is applied on the upper side of the conveyor belt, in order to receive the mass to be filtered. The vacuum box is mounted to pivot, as a whole, about a longitudinal axis offset laterally on one side of the conveyor belt. This vacuum box is borne by the inner ends of transverse bars which are articulated on horizontally aligned bearings materializing the pivot axis and which bear, at their outer ends, a manifold. This manifold is connected on the one hand to the vacuum box, via at least one connecting pipe, and on the other hand to the source of vacuum, by at least one dismountable coupling member.

Abstract: An apparatus, method and band for forming and/or dewatering a fibrous web, in which the web or a pulp suspension layer forming the same is conveyed and supported through a significant portion of its run in a paper machine by a specific processing band, while liquid such as water is simultaneously removed therefrom by hydraulically contacting the same with liquid present under vacuum or underpressure within the processing band, through a finely porous, liquid-suction surface on the band that is saturated with liquid.

Abstract: An improved headbox for a papermachine is provided wherein a pair of lobed rotors which extend the full width of the headbox are mounted for delivering paper making stock to rotation in the headbox. As the rotors are rotated, the lobes create a pumping action which withdraws the paper making stock from the distributor manifold and delivers it to the discharge nozzle of the headbox. Simultaneously, the lobes, acting in concert with a closely fitted housing also located within the headbox introduce a shear force on the paper making stock which produces high intensity small scale turbulence in the stock. In this regard, the lobed rotors perform two functions, (1) to deliver a uniformly metered quantity of paper making stock to the slice region, and (2) to impose a high intensity shear field on the stock to break up the flocculation that normally occurs.