Abstract: A stock feed system for a multi-layer headbox and a method in the operation of a multi-layer headbox in which into each inlet header of the multi-layer headbox, a stock concept is passed which has been produced out of the same fresh stock by adding the necessary chemicals and fillers to separated portions of the fresh stock.

Abstract: A press section of a paper machine, in particular for printing paper qualities whose grammage is in the range of about 40 g/m2 to about 80 g/m2 is disclosed. The press section comprises a pick-up roll having a suction zone on which a paper web is detached at a pick-up point from a forming wire and is passed on the pick-up felt into a first press nip in the press section. In the first press nip, the pick-up felt acts as a press fabric. The press section further includes an extended nip placed after the first press nip. Into this extended nip, the web is passed as a closed draw on support of a fabric face or roll face. The first nip in the press section is a roll nip with relatively low load and acts as a front nip. In the area of the first press nip, almost or approximately one half of the total amount of the water contained in the web entering into the front nip is removed from the web. The extended nip, which is the second press nip in the press section, is formed against a smooth-faced back-up roll.

Abstract: The invention relates to a coating method and device for coating a size-press roll, paper or board or a corresponding moving base. The coating device comprises a revolving coating bar which rests against the moving base and extends across the machine width. The coating bar is supported in a cradle substantially over its entire length and is a large-diameter grooved bar fitted against the moving base. The coating bar spreads and smoothes a coating agent onto the moving base. The coating agent is introduced into the coating device in advance of the coating bar in the running direction of the moving base.

Abstract: A method for regulation of the transverse distribution of the fiber orientation of a web produced by means of a paper machine or equivalent, by regulating the transverse profile of the discharge opening (16) of the headbox (10) of the paper machine. The transverse grammage profile of the paper web (W.sub.0 . . . W.sub.1) produced by means of the paper machine is measured, and the measurement signal obtained in this way is used as a feedback signal in the control system. With the machine configuration and parameters present in the paper machine to be controlled, data are collected concerning the relationship between the directional angle of the transverse distribution of fiber orientation and the transverse distribution of grammage of the web (W.sub.0 . . . W.sub.1) that is being produced by, carrying out response runs of the paper machine in its various states of operation (i). The relation data are stored in the memory of the computer (52).

Abstract: A method and device for stabilizing the running of a paper web in a paper machine in connection with a paper guide roll, in particular between a press section and a dryer section. In the method, the paper web is passed over the paper guide roll onto a drying wire or equivalent and negative pressure (suction) in the opening nip of the paper guide roll is lowered until a transition is made to the side of positive pressure in order to press the paper web against the drying wire or equivalent. The device includes a nozzle beam and an air chamber which communicates with a blow air duct. The nozzle beam is placed at the side of the opening nip of the paper guide roll such that the blowing discharged out of a nozzle opening of the nozzle beam is directed at the opening nip in order to press the paper web against the drying wire or equivalent.

Abstract: A device for use in a pulping process comprises first and second pulping units for processing feed material. A flow path connects the first pulping unit to the second pulping unit for transporting material between the units. The second pulping unit has devices for separating pulped material into a first material component comprising waste matter collected at the bottom of the second pulping unit, a second material component comprising sieved pulped material and third material component comprising unsieved pulped material. The second and third material component are separated from the first material component and are transported as a unitary flow to a primary space. Mixing and sieving devices are located in the primary space for separating the second material component from the first material component. The second material component comprises material which passes the sieving device and the third material component comprises material which does not pass the sieving device.

Abstract: A method in the regulation of a pulp suspension flow through the headbox of a paper machine/board machine wherein an additional flow is introduced into the pulp suspension at different points across the width of the headbox. The concentration of the additional flow is regulated by a mixer unit which includes a displaceable distributor part such that when the mixing ratio is being regulated, the flow resistances of the component flows, of the additional flow, entering into the mixer unit are adjusted by displacing the distributor part of the mixer unit in a chamber of the mixer unit.

Abstract: A method and device in the regulation of the headbox of a paper machine/board machine, in which additional flows are introduced into the pulp suspension at different points across the width of the headbox. The concentration of the additional flows is different than the average concentration of the pulp suspension. The additional flows are introduced through additional-flow pipes to the vicinity of inlet openings of turbulence tubes of a turbulence generator. The grammage profile of the web in the direction of width of the web is regulated in the headbox by adjusting the distance of the end of the additional-flow pipe/pipes from the turbulence generator, whereby the amount of the additional flow entering into the additional-flow pipes and, at the same time, the amount of the pulp suspension flow are regulated.

Abstract: The multi-cylinder dryer of a papermachine comprises a first tier of cylinders, wherein a web travels supported by a first dryer wire on the cylinders of the first tier of cylinders, as well as a second tier of cylinders, wherein the web travels supported by a second dryer wire on the cylinders of the second tier of cylinders. Upon passing around its wire guide roll, each dryer wire forms a loop having at least one section, along which the first or second wire, respectively, is free from the web and which in this wire traveling direction is immediately upstream of a point, at which the first or second wire is received on the first or second guide roll.

Abstract: The invention relates to a closed press section in a paper machine and comprises a compact combination of press rolls. Several of the rolls define press nips with each other, between which nips the web has a closed draw supported by the face of a fabric. The press section has a center roll in connection with which a press nip or press nips are provided. A closed loop of a transfer band is passed around the center roll. The web is transferred on an outer face of the transfer band after the last press nip in the compact combination of rolls as a closed and constantly supported draw onto a drying wire in a drying section following after the press section. The transfer band loop is made of a transfer band fabric that substantially does not receive water and does not rewet the web.

Abstract: A method and apparatus for ventilating pocket spaces in a multi-cylinder dryer of a paper machine, in particular a high-speed paper machine whose running speed is higher than about 800 meters per minute, in the area of a so-called twin-wire draw. In the twin-wire draw, the drying cylinders in the drying group are arranged in two rows placed one above the other, in which rows the successive cylinders are placed in the upper row and in the lower row as interlocked. In each cylinder group, there are two drying wires, an upper wire and a lower wire for pressing the paper web against heated faces of the drying cylinder while being guided by guide rolls placed in gaps between the cylinders. The paper web runs as free draws between the rows of cylinders.

Abstract: A method for providing a tubular roll mantle of a roll for a paper machine or equivalent with glide bearings and a roll including glide-bearings. The roll mantle is supported on a stationary roll axle by hydraulic glide-bearing members acting upon the roll mantle or upon the roll ends. The bearing members are loaded hydraulically by a pressure medium. The roll mantle is supported on the roll axle by at least one pair of glide-bearing members which acting radially and/or axially in opposite directions. When an outside force that shifts or attempts to shift the roll mantle in the direction transverse to the main loading direction and/or in the axial direction is applied to the roll mantle, the pressure in the glide-bearing member placed at the side of the higher loading is adjusted to a level higher than the pressure in the glide-bearing member acting in the opposite direction so that the outside forces are neutralized.

Abstract: The invention relates to a method and device for stabilizing a paper web in a group of cylinders in the dryer section of a paper machine. The group of cylinders are arranged in a row of drying cylinders and a corresponding row of leading rolls or equivalent placed as interlocked with the drying cylinders. The group of cylinders is provided with a single-wire draw so that the heated drying cylinders in the group are placed outside the loop of the drying wire and the leading rolls in the group are placed inside the loop of the drying wire. The stabilization device is arranged in the area between adjacent drying cylinders and the leading roll or equivalent placed as interlocked between the adjacent drying cylinders in the group of cylinders. Air is blow from the device and directed in the direction opposite to the running direction of the paper web.

Abstract: A coupling construction for coupling an extended-nip press roll including a loading shoe for loading a belt mantle to press the belt mantle toward a back-up roll. The coupling construction includes pivotally linked tie members for detachably connecting the bearing housings of the extended-nip press roll and the back-up roll so that the tie members are connected with either bearing housing and the roll in the other bearing housing is serviceable.

Abstract: A drum winder and method for winding a web in a drum winder, in which winding drums support a roll that is being formed and a cutter device cuts the web before a new winding is started on an empty roll spool. The cutter device has a cutter blade, an actuator, and a power transmission system operatively coupled to the cutter blade of the cutter device so that the movement of the actuator is transferable by the power transmission arrangement to the cutter blade. The cutter blade is movable along a curved path of movement so that the position of the cutter blade in its lower position is substantially more distant from one of the winding drums than it is in its upper position. On the blade beam of the cutter blade, seal units are arranged to seal the winding drums from below. The gap between the winding drums is sealed from above by an upper end-seal unit, whereby the gap between the winding drums can be pressurized. On the blade beam of the cutter blade, a sealing doctor blade may be arranged.

Abstract: The invention relates to a device in a paper machine for guiding a web and in particular in guiding a leader of the web. The device operates in a paper machine in the area between a center roll of the press section and a separate press nip in the press section. The separate press nip is formed between a smooth-faced upper roll and a hollow-faced lower roll. Around this lower roll, a lower felt of the separate press is placed and runs from a suction-transfer roll placed at the proximity of the center roll as a straight run into the separate press nip. At the initial end of the straight run of the felt of the separate press nip, in connection with the guide roll, air-transfer devices are arranged, by whose means a reduced pressure is produced at least across the width of the leader in connection with a closing inlet nip between the felt and the leader and/or in connection with an opening outlet nip defined between the guide roll and the straight run of the felt.

Abstract: An apparatus and method for guiding the transverse position of a fabric in a paper machine, such as a drying wire, a press felt, or an equivalent fabric having an alignment roll for the fabric. The axial alignment of the alignment roll is regulated by a guide apparatus. In the guide apparatus, a sledge is arranged in connection with one or both of the bearing supports of the alignment roll. The position of the sledge in relation to the frame part of the apparatus is regulated by an actuator motor. The sledge of the guide apparatus is arranged on linear guides in the frame part of the apparatus and is guided by guides. The apparatus further includes a self-holding power transmission arrangement operated by the actuator motor.

Abstract: A method for drum winding a web and a drum winder in which a roll that is being formed, i.e., onto which a web is being wound, is supported on winding drums. At least a part of the area that surrounds the roll being formed is subjected to a pressure lower than the pressure that prevails in a gap formed by the roll being formed and the winding drums, whereby a floating effect is produced on the roll being formed. The drum winder is preferably placed in a vacuum chamber.

Abstract: A method and apparatus for opening a nip in an extended-nip press in which a nip is formed by a pair of rolls. A loading shoe of the loading members of an extended-nip press roll in the nip is shifted to an open position and apart from the glide-belt mantle when the nip is opened. An inner end-flange part of the end flange is operatively coupled with bearing means of a glide-belt mantle and is rotated in a direction parallel to the face of a central axle of the extended-nip press roll, whereby the glide-belt mantle is removed from contact with a back-up roll since a central axis of the end-flange part is located at a distance from a central axis of the extended-nip press roll.

Abstract: A method and device for drying a paper web wherein the paper web is supported on a drying wire without long open draws of the web. The paper web is contact-dried by pressing it with the drying wire onto a face of a contact-drying cylinder whose diameter is greater than about 1.5 m on a sector b whose magnitude is greater than about 180.degree.. The web is evaporation-dried as blowing-on drying and/or as through-drying by means of high-velocity drying-gas jets applied to the web on the drying wire on the face of the following large-diameter cylinder whose diameter is greater than about 2 m on a sector a having a magnitude greater than about 180.degree. while the web is on the side of the outside curve. The web to be dried is passed over a sector c of the suction roll which is subjected to negative pressure while the web is supported on the drying wire at the side of the outside curve. The magnitude of the sector of the suction roll has a magnitude greater than about 160.degree.