Abstract: A Method for dewatering a paper web (W) formed in a preceding forming section of a paper making machine in which dewatering felts (11, 28) are applied to both surfaces of the paper web (W) as the paper web (W) travels in a closed draw from the forming section through a first extended nip press (NP.sub.1), thereby drawing a substantial amount of water simultaneously and symmetrically from both surfaces of the paper web (W). The upper felt (11) transports the paper web (W) from the first extended nip (NP.sub.1) to a smooth surfaced center roll (30) where the paper web (W) passes through at least one roll nip (N.sub.1, N.sub.2) or extended nip (NP.sub.2 ', NP.sub.3 '). The center roll (30) is positioned at an elevation higher than the first extended nip (NP.sub.1) thereby reducing the length of the press section. In a second roll nip (N.sub.2), a press fabric (33) is substituted for the upper felt (11) to efficiently remove additional water. Additional extended or roll nips (NP.sub.2, N.sub.3, N.sub.0, N.sub.

Abstract: A method and device for enhancing the run of a web in a paper machine in which water is removed from the web by pressing the web in at least one press nip and after pressing, the web is dried in at least one dryer group applying impingement drying. The web is guided along a substantially linear path or by using a large curve radius in the dryer group applying impingement drying. In the drying stage, after the impingement drying, the web is dried in at least one dryer group having normal single-wire draw. The web is passed from the pressing stage to the drying stage as a closed draw and more particularly, from the pressing stage to the area with single-wire draw in the drying stage so that the web is constantly supported against at least one support face.

Abstract: A press section of a paper making machine for dewatering a paper web (W) formed in a preceding forming section in which dewatering felts (11, 28) are applied to both surfaces of the paper web (W) as the paper web (W) travels in a closed draw from the forming section through a first extended nip press (NP.sub.1), thereby drawing a substantial amount of water simultaneously and symmetrically from both surfaces of the paper web (W). The upper felt (11) transports the paper web (W) from the first extended nip (NP.sub.1) to a smooth surfaced center roll (30) where the paper web (W) passes through at least one roll nip (N.sub.1, N.sub.2). The center roll (30) is positioned at an elevation higher than the first extended nip (NP.sub.1) thereby reducing the length of the press section. In a second roll nip (N.sub.2), which may alternatively be an extended nip (NP.sub.3), a press fabric (33) is substituted for the upper felt (11) to efficiently remove additional water. Additional extended or roll nips (NP.sub.2, N.sub.

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 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: A press section in a paper machine through which a paper web has a closed and supported draw. The press section has at least two successive separate press nips and dewatering of the paper web is carried out at least in the first one of these press nips, preferably between two press fabrics that receive water. The last press nip in the press section is an equalizing press nip which is separate from the preceding nip and in which no substantial dewatering is performed. The paper web is passed through the equalizing press nip from the preceding dewatering press nip on a transfer belt substantially not receiving water, on its substantially straight run. This run is continued after the equalizing nip as a run of substantially the same direction, on which run, some of the elongation of the paper web in the machine direction is compensated for, which elongation takes place in the equalizing nip, by a difference in speed of the transfer belt.

Abstract: A closed press section in a paper machine including a compact combination of press rolls, some of which define press nips with each other between which the web has a closed draw supported by the face of a fabric. The press section has a center roll in connection with which at least one press nip is formed. 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 preferably made of a 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 are chosen so that, after the last nip, the web follows the transfer band, and so that the web can be transferred as a fully closed draw onto the drying wire.

Abstract: Method and device in the manufacture of paper or board for dewatering of a paper web that is being manufactured. The paper web is transferred from a forming wire onto a wire in the drying section while constantly on support of a fabric that receives water, a transfer fabric, or of any other, corresponding transfer surface as a closed draw, at a particularly high speed, which is higher than about 25-30 m/s. Dewatering of the paper web is carried out by means of at least two subsequent press nips, of which nips at least one press nip is a so-called extended-nip zone, whose length in a machine direction is larger than about 100 mm. The extended-nip zone is formed in connection with a mobile flexible press-band loop. The distribution of the compression pressure employed within said extended-nip press zone is regulated and/or selected both in the transverse direction of the web and in the machine direction so as to set or to control the different profiles of properties of the web.

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 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: 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: 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: Method and device for intensifying the dewatering of a web in a paper machine press section having a compact roll combination and a separate press. The web is pressed in press nips formed by a compact roll combination. Thereafter, the web is transferred on a paper guide roll onto the outer face of the press felt of the separate press, on which felt the web is transferred into the nip of the separate press. The web runs over the lower sector of the paper guide roll and before the web is transferred into the nip of the separate press, the web as well as the press felt of the separate press are heated by means of heating devices. By means of these devices, the temperature levels both of the web and of the outer face of the press felt of the separate nip which felt reaches contact with the web are raised so that the dewatering is substantially intensified in the separate nip.

Abstract: An extended-nip press for dewatering of a paper or board web, comprising a counter-member (10), which forms an extended press zone (S) together with a press-glide shoe (33) and a glide belt (40) running around the shoe. Through said zone (S), at least one dewatering fabric (50) and the web (W) from which water is removed and which is supported by said fabric are passed. The glide belt (40) is passed over a leading and tensioning member (43; 70), and the closed loop of the glide belt (40) is guided around its leading and tensioning member (43; 70) so that, between said leading and tensioning member (43; 70) and the glide shoe (33) and its possible guide parts (33a, 33b), if any, the glide belt (40) has, as a rule, substantially straight runs (40a, 40b).

Abstract: Method for pressing and dewatering a paper web, in which a hot-pressing stage is utilized where the wet paper web is pressed in direct contact with a cylinder face that has been heated to a temperature higher than about 100.degree. C. A relatively long pressing time and a relatively low compression pressure are applied in a pre-heating/pre-pressing stage. In this preliminary stage, a surface layer of the cylinder that heats the paper web is heated to a temperature higher than about 100.degree. C. In the immediately following stage, the compression pressure applied to the paper web is lowered so that vaporization of the water present in the paper web is intensified.

Abstract: A press section in a paper machine includes, in the direction of web run, two successive, separate press nips for dewatering a web, the web passing between the nips in a closed draw. The first nip is formed between two, preferably hollow-faced, press rolls. The press section includes a first fabric which picks up the web from the forming wire. The press section comprises at least three fabrics of which one acts as a press fabric in the first press nip and another acts as a press fabric and/or as a transfer fabric both in the first as well as in the second nip. The web is transferred from the last press nip of the press section to the drying section. The last press nip is formed by an extended-nip press and has a nip zone with a length substantially longer than the length of the press zone of the preceding roll nip.

Abstract: A press section of a paper machine includes, in the direction of web run, at least three successive, separate press nips for dewatering a web, the web passing between the nips in a closed draw. The web is dewatered in the first nip through both of its faces. The press section includes at least one upper fabric and lower fabrics, the first fabrics in the direction of web run being water-receiving fabrics arranged such that one of the first fabrics acts as a press fabric in the first nip while the other of the first fabrics acts as a press fabric both in the first as well as in the second nip. Of the second fabrics in the direction of web run, the upper fabric is a water-receiving press fabric while the second lower fabric is a substantially non-water receiving transfer fabric or belt on which the web is transferred from the third press nip to the following drying section as a closed draw.

Abstract: Control of detachment of a web from a roll, such as a paper web from a press roll in a paper machine, in particular a so-called closed press section provided with a smooth-faced press roll. The temperature of the surface of the smooth-faced press roll is adjusted, so that adhesion between the roll surface and the paper web to be detached is influenced or affected. Thereby, the detaching angle and/or the detaching tension of the paper web, is set within an optimal range. Temperature profile of the smooth-faced press roll in the axial direction thereof, can also be adjusted with a view to controlling the detaching of the web.

Abstract: A press section of a paper machine includes a first upper fabric, a pick-up suction roll within a loop of the first upper fabric for transferring a web from the forming wire of the paper machine onto the first upper fabric, a first lower fabric, a lower first press roll within a loop of the first lower fabric forming a first double-felted nip with the pick-up suction roll, a smooth-surfaced center roll, a second press roll situated within the loop of the first upper fabric forming a second single-felted nip with the center roll through which the first upper fabric passes, and wherein the first upper fabric has a substantially straight run between the first double-felted nip and the second single-felted nip.

Abstract: An arrangement for equalizing the compression pressure acting on a web passing through a paper machine press nip formed by two opposed press rolls and through which of at least one press fabric passes. At least one resilient loop component passes through the press nip, the resilient loop component having an outer surface facing the web whose hardness is within the range of between 10 to 80 P & J by means of which smallsize variations in the compression pressure acting on the web in the range of up to about 6 mm are equalized. The resilient loop component has a framework layer within its thickness whose hardness is substantially greater than the hardness of the outer surface which faces the web by means of which larger variations in the compression pressure acting on the web are equalized. A press section incorporating the arrangement is also disclosed.