Abstract: The inventions concerns a sound attenuator for low frequencies for air-conditioning ducts, in particular for intake-air and/or exhaust-air ducts in paper mills. The sound attenuator comprises a frame whose flow duct substantially coincides with the air-conditioning duct and in which frame there is at least one plane attenuator member parallel to the flow direction and comprising one or several attenuator units operating by the Helmholtz and/or plate resonator principle. The attenuator member or members are fitted in the frame singly or as a group of several attenuator members to be replaced for cleaning and/or servicing of the sound attenuator and/or of the attenuator members.

Abstract: The invention concerns a reeling drum for a paper or board machine or equivalent, onto which reeling drum a material web, in particular paper or board, is reeled. Axle journals have been fixed to the ends of the reeling drum in a conventional way by means of end joints. By means of the axle journals, the reeling drum is supported in a revolving manner on a machine frame by means of bearing means. According to the invention, the reeling drum is provided with articulation devices or the like for variation of the deflection of the reeling drum and for equalization of the pressure produced by the material web reeled ont the reeling drum. The reeling drum has an inner mantle supported on the machine frame revolvingly, and an outer mantle fitted on the inner mantle coaxially. A gap remains between the inner mantle and the outer mantle, the outer mantle being supported on the inner mantle by means of the articulation devices.

Abstract: Process for the manufacture of a coating bar for a bar coater, wherein the coating bar is supported substantially over its entire length revolving in a cradle fixed to the frame of the coater. The coating bar is profiled and surface-treated by boronizing.

Abstract: An absorptive sound attenuator, which is intended particularly for intake and/or exhaust air ducts in paper mills. The sound attenuator comprises a box-like duct housing (10), in whose interior there is an inner tube (19), which is provided with through perforations (19a) and which forms the air duct (20). Around the inner tube is placed sound absorbing material (21, 22). The inner tube (19) defines the air duct (20) in its interior, the sound being absorbed in the area of the air duct (20). In order to facilitate cleaning and/or replacing of the sound attenuator components and the absorption material (21,22,26) in the duct housing (10) the absorptive sound attenuator is provided with openable outer walls (13a,13b,14a,14b,13A,13B). When these walls are open, the absorption material (21,22,26) can be removed and/or replaced from outside the inner tube (19).

Abstract: Frame construction for a press section of a paper machine which comprises, in a direction of running of a paper web, first a front frame and then a separate rear frame. On the front and rear frame, press rolls are mounted, at least some of which belonging to a compact press roll combination in which there are press nips between the press rolls and through which press fabrics are passed. With a view to facilitating replacement of press rolls and fabrics, the frame construction comprises a space which is situated between the front frame and the rear frame which are not connected together, and above the press roll combination. This space is constantly at least partially open, through which the different press rolls in the combination can be replaced. This space also facilitates replacement of the press fabrics provided in conjunction therewith. Another embodiment of the invention discloses an openable connection between the front and an intermediate frame.

Abstract: A web is reeled onto successive reeling drums to form respective jumbo rolls by reeling the web onto a first reeling drum at a reeling position to form a first jumbo roll, the first reeling drum being driven by a center drive. When the first jumbo roll is full, a second reeling drum is delivered to a standby position and is accelerated to web speed. A transfer device is employed to transfer the first jumbo roll to an exchange position while the center drive remains connected thereto. The second reeling drum is transferred to the reeling position and the web is exchanged from the first jumbo roll to the second reeling drum. The first jumbo roll is decelerated and the transfer device is shifted from the first jumbo roll to the second reeling drum. The center drive is connected to the second reeling drum.

Abstract: The invention relates to a coating device for coating, e.g. a size-press roll, paper or board or of an equivalent moving base. The coating device comprises a revolving coating bar which rests against a moving base. The coating bar extends across the machine width, and is supported in a cradle substantially over its entire length. The coating bar is fitted to spread and to smooth the coating agent onto the moving base which coating agent is introduced into the coating device in the direction of running of the moving base before the coating bar. The coating bar in accordance with the invention is a smooth bar of large diameter, which is fitted against the moving base so that the profile of coating quantity can be controlled.

Abstract: The invention concerns a method and apparatus for regulating the temperature of an adjustable-crown roll. The roll mantle (12) arranged to revolve on the stationary axle (11) of the roll (10) is loaded by passing a pressure medium into a pressure chamber (15) or series of chambers formed between the axle (11) and the mantle (12) so as to correct the deflection of the roll mantle (12). The roll (10) is additionally heated/cooled by passing heating/cooling fluid into the roll (10). The heating/cooling fluid used for the regulation of the temperature of the roll (10) is introduced into the roll (10) so as to be substantially uniformly distributed over the surface area of the roll (10) such that heat is removed or produced in the radial direction of the roll.

Abstract: A method and apparatus in the press section of a paper machine for regulating the axial linear-load profiles in its nip or nips (N.sub.1,N.sub.2,N.sub.3). The axial temperature profile(s) of the outer mantle(s) of a press roll or rolls (11, 13, 16, 17) is/are regulated. Thereby, the distribution of the diameter of the press roll in the axial direction is controlled on the basis of thermal expansion. Also thereby, the distribution in the transverse direction of the machine of the linear load in the press nip or nips (N.sub.1,N.sub.2,N.sub.3) formed by the press roll or rolls (11, 13, 16, 17) is affected. The temperature profile of the outer mantle(s) (11', 13',17') of the press roll or rolls (11, 13, 17) is regulated by a press felt or felts (10, 14, 18) running through the press nip or nips (N.sub.

Abstract: Closed press section in a paper machine, comprising a compact combination of press rolls. Certain of 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. The web-adhesion properties of the outer face of the transfer band fabric are chosen so that, after the last nip, the web follows the transfer band fabric, and so that the web can be transferred as a fully closed draw onto the drying wire.

Abstract: The invention concerns a roll for use in the production of paper, in particular a center roll in a press section of a paper making machine, with which the web is in direct contact and from which the web is detached. In the invention, a composite structure has been formed onto the cylinder mantle of the roll. According to the invention, the roll face is provided with a surface layer which protects the roll from wear and which provides good properties for detaching of the web, this surface layer being formed by thermal spraying of a powder wherein metal and ceramic phases are in the same powder particle. The roll face is additionally provided with a dense layer for protection against corrosion, which layer is made of stainless steel whose chromium content is 10 to 29% and which layer is placed between the surface layer and the roll mantle. The function of the layer for protection from corrosion is to protect the roll mantle from corrosion and to promote the adhesion of the surface coating to the roll.

Abstract: The invention concerns a steam and condensate coupling for a drying cylinder in a paper machine. The steam and condensate coupling includes a piston ring having a seal therein. This stationary, nonrevolving seal is pressed by means of steam pressure against the revolving axle or against a flange part or equivalent permanently connected to said axle. A piston ring is located in the coupling, which includes a face placed substantially perpendicularly to an axial direction of the cylinder, or slightly inclined from the perpendicular plane. In the coupling construction, steam pressure is passed onto the face of the piston ring, and a force is produced. By this force, the piston ring and the seal are pressed toward the revolving axle. Thereby, by means of the steam pressure, a pressure-tight joint is provided between the seal and the revolving axle.

Abstract: A paper machine for manufacturing a soft crepe paper web, comprising a wet end (1) having a forming wire (4) for forming and carrying a paper web (7), and a drying section (2) provided with a drying cylinder (12), said paper machine having a first operating arrangement for manufacturing a soft crepe paper web with certain bulk and softness values, in which first operating arrangement the drying section has a felt (13) arranged to run in a loop from a pick-up roll (14) at the transition between the wet end and drying section, to a press roll (15) at the drying cylinder, and the carrying forming wire runs up to the pick-up roll (14) to transfer the paper web to the felt (13).

Abstract: The surface properties of a roll and/or rolls in a paper machine are affected by regulating the temperature of the roll face by means of an external heating device. In the arrangement, a combination of a heating device and a roll coating is used in such manner that the heating radiation penetrates through the paper or only directly to the roll face, but does not heat the roll itself at a depth greater than the roll face. The roll coating is preferably made of a dark, readily heatable and insulating material. The arrangement of the invention is utilized for example in a calendar and for detaching the paper from a roll.

Abstract: The invention is related to a blow and air-conditioning device for an inverted cylinder group in a drying section of a paper machine. The inverted cylinder group includes a lower row of drying cylinders and a corresponding row of leading cylinders or rolls placed above said cylinders in the gaps between them. The inverted cylinder group is provided with single-wire draw so that the heated drying cylinders placed in the lower row in the group, are placed outside the loop of a drying wire and the lead cylinders in the group are placed inside the drying-wire loop. A blow box is fitted in spaces between adjacent leading cylinders and above the drying cylinders. A nozzle of the blow box directs blowings into a wedge-shaped nip space opening in the direction of running of the web, which outlet nip space is defined between the face of the drying cylinder and the run of the web and of the drying wire.

Abstract: A twin-wire web former in a paper machine includes a covering wire and a carrying wire defining a forming zone, at the beginning of which zone there is a forming gap into which the discharge opening of a headbox feeds a pulp suspension jet. A first forming roll is located on the twin-wire zone, in the area of the forming gap, on which the twin-wire zone is curved within a certain sector, followed by a dewatering unit(s), which is in turn followed by a second forming roll(s) in the twin-wire zone. Thereafter, the web is detached from the covering wire and passed on the carrying wire to a pick-up point. Between the first forming roll and the second forming roll(s), a dewatering unit(s) is provided which comprises a press-support unit which guides the wire that enters into contact with the unit as a straight run. The dewatering unit(s) also includes a dewatering equipment facing the press-support unit and provided with suction and foil equipment for removing a substantial amount of water out of the web.

Abstract: The invention concerns a method for making the foundation slabs of a paper machine. In the method, reinforcement strands are fitted inside a mold for a base beam. Before filling-concreting of the mold, a base slab provided with a plurality of foundation bolts is installed in connection with the reinforcement strands and preferably on support of said strands. After the slab has been installed as sufficiently planar manner with its face horizontal, the filing-concreting of the base slab is carried out. Upon drying of the concrete cast, the final tightening of the foundation bolts of the base slab is carried out. The ultimate machining of the base slab is carried out on site in the mill space by passing a machining device supported by guides rails which have been adjusted to a horizontal level along faces of the base slab.

Abstract: A wire loading device in a paper machine, by whose means a mechanical load is applied to the wire of the paper machine across its entire width, is disclosed. By means of this load, a pressure pulse is applied to the fiber layer or web supported by a wire or between wires. By means of the pressure pulse, the dewatering of the web is promoted, the formation of the web is improved, and/or the transverse profiles of different properties of the web are controlled, such as the transverse profiles of dewatering, filler distribution, formation, and/or retention. The loading device includes a plate-shaped spring blade, whose side is arranged as substantially parallel to the run of the wire or wires. The spring blade is adapted to drag against the inner face of a wire loop to produce a pressure pulse. The spring blade is attached, from outside its dragging area, to a frame part of the loading device.

Abstract: A device for contact-free supporting, turning, and spreading of a paper web, comprises a face (K) curved in accordance with the turning of the web (W), in connection with which face (K) the web (W) runs supported by air blown in between the face (K) and the web (W). The nozzle members in the device comprise guide faces (28a, 28b) and carrier faces (27, 37) placed in connection with the guide faces, air being blown through nozzle slots (26a,26b,36) in the nozzle members, transverse to the direction of running of the web (W), onto the carrier faces (27,37). The nozzle slots (26a,26b,36) are, from one side, defined by the guide faces (28,28b,38). The air-supported face (K) in the device is defined by carrier faces (27,37) substantially parallel to the run of the web (W) to be supported, provided at float-nozzle boxes (20) and at foil-nozzle boxes (30). In the direction of running of the web (W), the first nozzle box and the last nozzle box are float-nozzle boxes (20), in which the nozzles (26a,26b) that flow (F.

Abstract: A method and an apparatus for cutting a paper web (W) in a group of drying cylinders provided with single-wire draw (13) in a paper machine or a finishing machine. The drying wire (13) is separated from the paper web (W) by one or more guide rolls (14a,14b) thereby creating an open draw (W.sub.o) of the web (W). The cutting of the paper web (W) is carried out at the open draw (W.sub.o) of the web (W). After the open draw (W.sub.o), the drying wire (13) and the web (W) are rejoined on the surface of the following leading or drying cylinder (11). Preferably, two guide rolls (14a,14b) are utilized whereby the first roll is disposed so that the drying wire (13) supports the web (W) up to the location of the guide roll (14a), which is followed by an open draw (W.sub.o) of the web. The drying wire (13) is returned onto the following leading or drying cylinder (11) with the second guide roll (14b).