Abstract: A hydraulic nut having a first part connected around the first end of a fixing member the first part having an annular recess which opens to receive a second part forming an annular member which fits within the annular recess, wherein a pressurized medium chamber is defined between the second part and the annular recess. The second part has an annular portion which extends longitudinally away from the first part. The annular portion has an outer surface which is spaced radially inwardly to form a locking part recess. A locking part is placed within the locking part recess, and has an inner diameter which is threadedly engaged with the second part outer surface. The locking part has a surface facing the first part first surface, and movable by the threaded engagement with the second part to an abutment with the first part first surface.

Abstract: A refining surface for a refiner intended for defibrating lignocellulose-containing materials, the refiner having at least two refining surfaces arranged coaxially relative to each other, at least one of which rotates around a shaft, and between which the material to be defibrated is fed. The refining surfaces define grooves and between them ridges, at least part of the refining surface ridges being formed of at least two different ridge parts connected to each other in such a way that one ridge part is farther ahead in the rotation direction of the refining surface than the other ridge part. Further, at least in some ridge parts, the front wall in the rotation direction of the refining surface is over at least part of its length substantially inclined.

Abstract: Refining elements are disclosed for use in the refining of fibrous material in which the refining elements include a pattern of bars and intermediate grooves between the bars. The bars extend in an arc-shaped direction outwardly over the refining element and the upper surface of the bars includes smaller grooves which form angles of from about 10° to 90° with respect to the longitudinal direction of the bars so that the smaller grooves on the bars extend substantially radially.

Abstract: The roll of a paper/board machine or finishing machine has an inner elongated structure (11; 104) which is at least partly comprised of composite material, including reinforcing fibers in matrix material. The structure is preferably comprised of a combination of metallic material and composite material.

Abstract: A powdery layer is formed on a first side of a web (W) which serves as a substrate by applying electrically charged particles on the web while a rotating grounding electrode is located at a second side of the web.

Abstract: A nip characterization system which has as inputs the pressure applied to the nip by the hydraulic loading devices, and loads applied at the end bearings and/or the loads applied to the roll support beam, and in addition directly measures nip load, has more than sufficient information to completely characterize the nip.

Abstract: A method for preliminary treatment of particles of a powder in a dry surface treatment process before applying the powder particles on a surface of a substrate by utilizing an electric field created by electrodes. The Electrodes are located at opposite sides of the substrate in such a way that at least one first electrode is located at the side of the substrate to be coated, and at least one second electrode is located at the opposites side of the substrate. The particles of the powder are pre-charged before bringing them into the electric field.

Abstract: Methods for bleaching chemical pulp are disclosed including dewatering the pulp to a concentration of from 25 to 40%, bleaching in a first chlorine dioxide stage, followed by a second alkaline bleaching stage, followed by a third chlorine dioxide bleaching stage, dewatering the bleached pulp to a concentration of from 10 to 40% and producing a filtrate, and recycling the filtrate to control the pulp concentration of the dewatered chemical pulp to from 8 to 15% in the first bleaching stage.

Abstract: The disclosure includes a method for gluing fibrous raw materials, which improves the even distribution of the binding agent on the fibers considerably. The disclosure furthermore describes a device for performing the gluing process. The disclosure suggests a method for moistening fibrous raw materials provided for the manufacture of fiberboards, mats and the like with bonding agents, wherein the fibrous raw materials exist in at least a pre-dried state and are moistened by a pre-dispersed binding agent in a continuous stream, and wherein subsequent to the moistening process the fibrous raw materials are compressed with high pressure before being conveyed further.

Abstract: A thickener for concentrating fiber suspensions is disclosed including a housing, a rotor arranged on the housing, a screen attached to the rotor for separating the fiber suspension into a first fraction passing through the screen substantially containing only fibers and a fraction not passing through the screen and containing coarse undesired particles, a stationary thickener surrounding the rotor and provided with through holes and supply conduits for supplying the first fraction to the stationary thickener for separating that fraction into a fraction passing through the holes in the stationary thickener and a separate fraction not passing through the holes in the stationary thickener. The through holes are dimensioned such that substantially only liquid is permitted to pass through the stationary thickener and the fraction which does not pass through the through holes comprises the thickened fiber pulp free of the undesired coarse particles.

Abstract: Containers for collecting and discharging particulate lignocellulosic material are disclosed, including a cylindrical upper portion, a lower portion tapering towards a bottom elongated space, an exit pipe below the bottom, a pair of parallel screws mounted on parallel shafts in the elongated space in a common horizontal plane for feeding the particulate lignocellulosic material towards the exit pipe, a pair of distributors disposed on the parallel screws above the exit pipe comprising radial discs, and a pump below the exit pipe for transporting the particulate lignocellulosic material to a subsequent step.

Abstract: A method for optimizing a production unit, which unit is a unit or a group of units in a papermaking, cardboard, or converting process. The method comprises the steps of analyzing the initial production features, determining the objectives of the production performance, determining the means for upgrading production and determining the upgrade package composition making an agreement with the customer for the means for upgrading production whereby the agreement comprises a step of the customer paying an investment fee (SP) of the upgrade package and a cumulative fee Pcum covering the rest of the payment to the vendor.

Abstract: A web (W) is passed from a preceding treatment stage to a finishing device in which the web (W) is finished in the finishing device and from which finishing device the web (W) is passed further to a subsequent treatment stage. The web (W) is brought to a roll (11; 14) of the finishing device as supported substantially before a nip area (N1; N2). The web (W) is passed from the circumference of a roIl (12; 15) of the finishing device as substantially supported afler the nip area (N1; N2). A device for passing a web in connection with a finishing device of a paper machine causes a web (W) to be brought by the device to the circumference of a roll (11; 14) of the finishing device substantially before a nip area (N1; N2) and/or the web (W) can be passed from the circumference of a roll (12; 15) of the finishing device substantially after the nip area (N1; N2).

Abstract: Liquid is supplied within a substantially vertical mixing chamber in a substantially tangential manner from a chamber top section, such that the liquid is deflected for rotatory motion against a chamber wall while advancing, in response to a pressure difference, downwards in the direction of a chamber longitudinal axis. Pulverous material is supplied by compressed air into the chamber (3) from the top section and into an air core (A) established by the liquid in rotatory motion, such that the pulverous material containing little air, and by being heavier than the air contained in the pulverous material and/or used for carrying the same, is driven in response to a centrifugal force into the liquid in rotatory motion, and the air separates towards the eddy center, and that the liquid containing pulverous material and the air supplied into the chamber, are discharged through an open bottom section of the chamber (3).

Abstract: For profiling a fiber web (W) a shoe roll (10) defines a roll nip (4) with an opposite counter-roll (3). The shoe roll (10) has a static roll frame (5), a shoe element (2) located at the roll nip (4) and an endless belt (6) rotating about the shoe element (2) and the static roll frame (5). A lubricating cycle (71) is provided between the endless belt (6) and the shoe element (2) in the roll nip. The surface of the web (W) is profiled in the nip by loading the loading element (8). Before or after the shoe element (2), the shoe roll (10) has a longitudinally extending profiling strip (1) which can be pressurized to be able to perform thickness profiling of the surface of the fiber web (W). The static roll frame (5) and the shoe element (2) the endless belt (6) rotate about the profiling strip.

Abstract: A press device with an extended press nip for pressing of a continuous paper or paperboard web comprises a press shoe, a backing member, a support, and a plurality of loading cylinders with main axes in their longitudinal directions. The press shoe can be moved between different positions. A stop member is arranged downstream of the press shoe for transfer between and fixation at different stop positions in the machine direction. At least some of the loading cylinders or the support comprise members eccentrically arranged with respect to one or some of the main axes, which members can be brought into different eccentric positions with respect to the main axes. The eccentric position and the stop position controls the position of the press shoe during the pressing, and thereby the pressure curve.

Abstract: A method is provided for manufacturing a screen cylinder, as well as a screen cylinder with screen wires in the axial direction of the screen cylinder set at predefined intervals into a cylindrical screen surface and fastened to support rods, with end rings are arranged at the ends of the screen cylinder. At least one end ring is mounted at one end of the screen cylinder in such a manner that the end ring is arranged to at least one support rod at the ends of the screen wires or closest to the ends of the screen wires without fastening the end ring to the screen wires. When installing the end ring, a shrink fit is formed between the end ring and support rod, wherein the end ring is arranged to press the support rod substantially perpendicular to the axis of the screen cylinder.

Abstract: A method for controlling the water jet sharpening sequence of a pulp grinder is provided, wherein a high-pressure sharpening water jet is directed toward a surface of a pulpstone with a water sharpening apparatus. An actual quality value of the fiber pulp is determined for at least one variable, and a target quality value is defined for each of the at least one variable. The actual quality values and corresponding target quality values are transmitted to a control unit that includes an adjustment strategy set for controlling water sharpening of the pulpstone. According to the adjustment strategy, the treatment pressure and/or the treatment interval of the sharpening water jet is controlled relative to an error value between the target quality value and the actual quality value of the fiber pulp. An associated apparatus is also provided.

Abstract: A paper or paperboard web (W) is precalendered. A web that has undergone earlier dewatering stages is calendered to attain a suitable surface for the coating process. The web is calendered (C) one-sidedly in such a manner that the absorption level of the second side (W2) of the web entering the calendering, which is higher than the absorption level of the first side (W1), is reduced in the calendering nearly to the same level or at least to the same level with the first side (W1).

Abstract: A continuous web (W) is reeled up on a center-drive assisted reeling core (C2, C3) to form a machine reel (R), and the reeling core (C2, C3) moves when the center drive (PD, SD) is coupled to the end of the reeling core. The rotating movement and torque necessary in the center drive (PD, SD) are transmitted from a stationary drive motor (PM, DM) to the end of the reeling core (C2, C3) by a power transmission (T) equipped with one or more joints, wherein the need to move the drive motor (PM, DM) along with the movement of the reeling core (C2, C3) is avoided. In a preferred embodiment of the invention the power transmission (T) is implemented by a belt drive, wherein by selecting the belt transmission in a suitable manner, it is also possible to avoid the need to use a separate gear system.