Abstract: A drive assembly for operatively rotating a web spreading roll of a paper mill or the like utilizes a toothed belt for transferring rotational motion from a motor-operated driving toothed pulley to a freewheeling or otherwise rotatably mounted driven toothed pulley. The driven pulley is, in turn, coupled to at least one of the plural rotary driven roll segments of and that are carried on the curved shaft of the web spreading roll. To minimize wear on the toothed belt, the driving and driven pulleys are fixedly mounted in positions of permanent alignment with one another, as by mounting both the drive motor and the driven pulley on the shaft bearings housing located at one end of the spreading roll shaft. A flexible coupling, as in the form of a rubber or otherwise suitably resilient bellows or the like, connects the driven pulley to the at least one roll segment for transferring rotation of the driven pulley to the roll segment so as to operatively rotate the web spreading roll.

Abstract: A press section in a paper machine including a compact combination of rolls which form a number of press nips with one another in which water is removed from a paper web. The paper web has a closed draw supported by a press fabric or by a roll face at least between the nips. The press section includes a center roll in connection with which at least two press nips are formed. The last press nip placed in connection with the center roll is an extended nip. The center roll is a roll provided with a circulation system for a heating medium and a heatable outer mantle. An outer face of the mantle of the center roll is heated by means of the circulation of the heating medium to such a temperature level that the dewatering of the paper web in the press nips arranged in connection with the center roll, in particular in the extended nip, is intensified substantially.

Abstract: A method for the continuous overall regulation of a single-layer or multi-layer headbox of a paper, board or pulp-draining machine. A physical fluid flow model of a pulp suspension flow discharged from the headbox to be regulated is formed and solved to obtain a simulated flow state based, e.g., on data on the geometry of the headbox and initial and boundary conditions related to the headbox. A target flow state based on the quality requirements of the paper produced from the pulp suspension flow and the costs of operation and runnability of the machine is obtained and a difference between the simulated flow state obtained as the solution of the flow model and the target flow state is determined. This difference constitutes a cost function which is optimized to determine optimal regulation values and set values for instrumentation devices and actuators of the headbox which affect the pulp suspension flow.

Abstract: A method for quick-opening a set of rolls in a calender, in particular a supercalender, in which a paper or board web to be calendered is passed through calendering nips formed by a variable-crown top roll, a variable-crown bottom roll and by two or more intermediate rolls arranged between the top and bottom rolls. The rolls are arranged to form a substantially vertical stack of rolls, and the intermediate rolls are supported by the use of hydraulic relief cylinders so as to relieve the nip load produced by the mass of the bearing housings of the intermediate rolls and auxiliary devices associated therewith. During the quick-opening of the set of rolls, the bottom roll of the set of rolls is lowered and the relief pressures in the hydraulic relief cylinders are discharged so as to open the calendering nips.

Abstract: A method and device in the operation of a doctor blade in a paper machine/board machine in which different quantities of lubricating medium are supplied into different areas in the longitudinal direction, i.e., along the width, of the doctor blade, independent of one another. A larger amount of lubricating medium is supplied into the area having the maximum extent of wear of the doctor blade.

Abstract: A system for combining a dilution flow with the stock flow passed from the inlet header of the headbox of a paper/board machine. The equipment comprises a valve which regulates the dilution flow and which consists of a valve housing, of a spindle, and of a flow duct placed in the spindle, which flow duct can be rotated into different regulation positions for the purpose of regulating the dilution flow departing from the valve. One end opening of the flow duct and the flow opening in the valve housing are placed in alignment with one another irrespective of the position of rotation of the spindle. The position of the other end opening of the duct placed in the spindle in relation to the flow opening in the valve housing can be regulated by rotating the spindle.

Abstract: A device in a paper machine or in a finishing device of a paper machine for removing dust in which a blowing is directed at a web to cause the separation of dust from the web and a suction effect is applied to the web to remove the dust separated from the web. A vortex flow is produced before the dust separating blowing in the running direction of the web to prevent carriage of the dust into the environment and to compensate for the suction effect on the runnability of the web. In the device, blow elements produce a blowing that separates dust from the web and suction elements produce a suction effect so as to remove the dust that is separated out of connection with the web. The device includes an arrangement for producing a vortex flow before the dust separation blowing in the running direction of the web to prevent carriage of the dust into the environment and to compensate for the suction effect.

Abstract: A roll and blade gap former for a paper machine having first and second wires guided in a respective loop and defining a twin-wire forming zone, a forming gap in which the first and second wires converge before the twin-wire zone, a headbox including a slice channel having a slice opening through which a stock suspension jet is fed into the forming gap to form a web between the wires, and drainage and forming elements arranged in the twin-wire zone for removing water from the web. To provide an improvement in the control of the Z-direction properties of the web, the former includes turbulence generating vanes arranged in the slice channel in the headbox to cause turbulence in the stock suspension jet upon its discharge from the slice opening into the forming gap and a first forming roll arranged in the twin-wire zone and which constitutes the first drainage and forming elements in the twin-wire zone after the forming gap.

Abstract: A method and apparatus for transporting paper rolls to a pickup point (8) of a crane of a crane-assisted storage area and for transferring a roll from the storage area from the pickup point (8). An upright-oriented roll is centered by a centering conveyor (5) at a point different from the pickup point (8) of the crane and the centered roll is then moved precisely to the pickup point (8). A two-part conveyor comprising the centering conveyor (5) and a delivering conveyor (9) are rotatable about a center axis so that the centering part (5) and the delivering conveyor (9) can alternatingly be aligned with the pickup point (8).

Abstract: A method and device for removing water from a paper or board web and for passing the web as a closed draw from a forming wire or transfer wire of the web former to the press section and through one or more dewatering press nips in the press section. The web that runs on the forming wire or transfer wire is made to adhere in a transfer and pre-press zone to an outside face of a transfer belt which is substantially non-water-receiving. After this pre-press zone, the web is separated substantially immediately from the wire and passed on support of the transfer belt onto the next press fabric in the press section and/or into the next press nip. In the pre-press zone or zones, a substantial amount of water is removed out of the web substantially in one direction only, and, at the same time, the web is made to adhere reliably to the outside face of the transfer belt.

Abstract: The invention concerns a method for two-sided coating of a printing-paper web with a coating paste or equivalent. In the method, the paper web is passed through the coating part of the paper machine, in which the first side of the web is coated in the first coating station of said coating part, and the coating-agent layer produced on the face of the web is dried at least partly by means of a first drying unit. The second side of the web is coated in the second coating station of the coating part, and the second coating-agent layer produced on the face of the web is dried at least partly by means of a second drying unit.

Abstract: A method of regulation in winding, wherein a number of separate rolls are formed around separate roll cores situated one after another and side by side while being supported by support members and loaded by linear loads produced by truncated rolls in a set of truncated press rolls. The distance at each particular time between at least one truncated roll in the set of truncated press rolls and a beam that loads the set of truncated press rolls is measured. Based on the measured distance, a measurement signal is passed to a regulator which provides a regulation signal to valves that control actuators of the beam so as to adjust the distance between the beam and the set of truncated press rolls to the desired value.

Abstract: A method for regulating the loading of adjustable-crown roll having a stationary roll axle around which a roll mantle is rotatingly mounted, and of which roll a nip is formed with a backup roll. The deflection of the roll mantle and/or the linear load in the nip is regulated by loading elements and a backup zone supported on the roll axle and acting upon the inner face of the roll mantle in the direction of the nip plane. Upon the inner face of the roll mantle of the roll of the backup zone/zones, a sum force is produced which acts in the nip plane in a direction substantially opposite to the force produced by the loading element, and the force effect applied by the backup zone/zones to the inner face of the roll mantle is applied, examined in the direction of the circumference, to more than one point.

Abstract: A method for winding a paper web in which the paper web is unwound from a paper reel and passed through a slitting station of a slitter-winder in which it is slit longitudinally into component webs by blades, and the component webs are further wound into component rolls. A portion of the ends of the slit component webs are cut off in a cutter device to provide them with predetermined measures, i.e., a predetermined initial length, before the component webs are passed into the winding stations. The winding device in winding of a paper web includes an unwind station and a slitter-winder which includes a slitting station, a cutter device, and the winding stations for component rolls. The cutter device of the slitter-winder includes an arrangement for cutting the component webs to provide the predetermined lengths therefor.

Abstract: An apparatus for drying and smoothing a fibre web (5) between two tight bands (1, 2) that move in parallel and turn around turning rolls (6a, 6b, 7a, 7b), the first band (1) being heated with hot steam and the second band (2) being cooled with water, and the fibre web (5) being conducted through the drying zone that the bands (1, 2) define together with at least one felt or wire (3, 4) such that the fibre web (5) is in contact with the surface of the first, heated band (1) and that the felt or wire (3, 4) is between the fibre web (5) and the second, cooled band (2). In the invention, the fibre web (5) is smoothed such that the press means located in the vicinity of the first turning rolls (6a, 7a) in the travel direction of the fibre web (5) apply to it a pressure that is essentially higher than the pressure in the other parts of the drying zone.

Abstract: A method and device for winding a material web, such as a paper web, onto a spool or equivalent through a winding nip formed between a cylinder, roll or equivalent and the roll that is being formed. The transfer of air taking place through the winding nip along with the material web to be wound is retarded and/or prevented by forming a positive pressure in the wedge-shaped area placed after the winding nip.

Abstract: A method and a device for finishing the surface layers of the machine reel (13) that is formed during reeling of the web (P). In the method; a member (20) that presses the web is brought onto the face of the reel (12) that is being completed before the reel (12) that is being completed is transferred to the reel change position. The full reel (12) is transferred to the reel change position so that the member (20) that presses the web during nip-free reeling forms a contact with the web, which contact prevents access of air between the web layers, and follows the full reel (12) during its transfer to the reel change position. During the reeling of the surface layer to be finished, the member (20) that presses the web is shifted apart from the face of the reel (12) that is being completed along such a path (D) of movement that the member (20) that presses the web maintains a contact of the desired extent with the face of the reel (12) that is being completed.

Abstract: A method and apparatus for reducing the wear of the belt mantle of an extended-nip roll including a resilient belt mantle arranged to revolve on support of bearings around a stationary central axle. The central axle has loading members connected with it, such as a loading shoe, which are pressed by the pressure of a loading medium, such as hydraulic fluid, towards a backup roll, whereby the belt mantle conforms to the shape of the backup roll in the area of the shoe. Actuators connected with the ends of the belt mantle are provided and act with a force upon the ends of the belt mantle of the extended-nip roll so that the direction of stretching of the belt mantle of the extended-nip roll is reversed alternatingly by controlling the actuators and/or locking devices which lock the ends of the belt mantle.

Abstract: An assembly, for preventing striping in an applicator used for coating a paper or paperboard web, comprising a doctor blade suitable for metering and smoothing a coat to be applied, a cross-machine elongated application chamber adapted immediately in front of the doctor blade, one of the sides of the chamber being formed by the web being coated. A flexible leading blade forming a front sealing edge of the chamber has a perforated stem with openings to allow coating mix from the application chamber to travel in front of the leading blade. A homogenizing chamber is formed in front of the openings in the leading blade using a dam lip or similar flow barrier. The flow exiting the openings of the leading blade is homogenized in the homogenizing chamber as the flow impinges against the flow barrier.

Abstract: A method and device for drying a paper web in a dryer section having a number of successive dryer groups with a single-wire draw, and being situated after a press section of the paper machine. Each dryer group includes contact-drying cylinders arranged in a first row and reversing suction cylinders or equivalent suction rolls arranged in a second row, the rows being horizontal, diagonal or vertical rows. The paper web is dried by contact-drying cylinders from the side of its lower face across the entire length of the dryer section. The paper web is passed as a closed draw from one dryer group to the next group, and the paper web is guided, while it runs on the drying wire at the side of the outside curve, by the reversing suction cylinders having a curve radius selected in a range from about 250 mm to about 1000 mm.