Abstract: A method for producing dried multilayer paper is provided comprising dewatering a first aqueous fibrous suspension, thereby creating a first fibrous web; dewatering a second aqueous fibrous suspension, thereby creating a second fibrous web; spraying one or more of a first fibrous web and a second fibrous web with a spray solution or spray suspension, thereby producing at least one sprayed fibrous web; assembling the first fibrous web with the second fibrous web; dehydrating the resulting layer compound by pressing; then dehydrating by supplying heat, which creates the dried multilayer paper. The spray solution or spray suspension contains water and at least one water-soluble polymer P. The polymer P is obtained by polymerizing: 40 to 85 mol % of a monomer of Formula I in which R1=H or C1-C6-Alkyl; and 15 to 60 mol % of one or more ethylenically unsaturated monomers.

Abstract: An orifice plate having orifice openings is interposed between a roller body and a side plate. In a closed region of an outer peripheral surface of the roller body which is covered with a base material, the base material is held on the outer peripheral surface of the roller body under suction by a negative pressure developed in suction holes. In an open region of the outer peripheral surface which is not covered with the base material, the sucking of a gas from an exterior space into the roller body is suppressed because it is difficult for the gas to pass through the orifice openings. This suppresses a reduction in sucking force in the closed region due to the entry of the gas from the open region. The roller body, the orifice plate and the side plate rotate as a unit. This suppresses deterioration of the members due to the slidable movement thereof.

Abstract: Methods for dewatering a fiber suspension in a twin-wire press, having a lower wire and an upper wire, and a first and a second dewatering table, which supports the wires such that a dewatering space is defined by the wires, are disclosed. The wires transport the fiber suspension under compression of the wires by the dewatering tables, such that the fiber suspension is dewatered and forms a fiber web between the wires. A separate pressing force is applied against one of the wires, such that this wire presses the formed fiber web via the second wire against one of the dewatering tables and further dewaters the fiber web. The separate pressing force is adjusted such that a desired dryness of the fiber web leaving the dewatering tables is achieved. A twin-wire press is also disclosed.

Abstract: Dewatering system for dewatering a web. The system comprises a former, a belt press, and a structured fabric comprising a paper web facing side and being guided over a support surface and through the belt press. The structured fabric runs at a speed differential relative to a wire of the former. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.

Abstract: A frame for a twin-wire press is disclosed including pairs of side members including upper and lower side members arranged on opposite sides of the press, between which upper and lower rolls are attached, a plurality of transverse beams arranged between the pairs of side members which themselves are sections of flat sheet metal and spacers for mutually releasably connecting the side members with the sheet metal being formed so that it permits a degree of curing in the vertical plane to facilitate access to the space between the upper and lower rolls. A method for exchanging wire in a twin-wire press of this type is also disclosed.

Abstract: Twin-wire presses for dewatering fiber suspensions are disclosed including upper and lower rolls and endless upper and lower wires running around the rolls, a pair of dewatering tables supporting the upper and lower wires and forming a dewatering space between them for initial pressing and dewatering of the fiber suspension, to form a fiber web between the wires, a roll engagement downstream of the watering tables, a final dewatering in a press frame, a press and lift arrangement for vertically adjusting the first dewatering table and a link system joined to the press frame and to an upper section of the first dewatering table which is movable from and against the second dewatering table by means of the press and lift arrangement thereby.

Abstract: A machine for the manufacture of a fiber material web (12), in particular a paper or card web, having a forming zone including at least one circulating endless dewatering belt (16, 18) includes at least one pressing zone (14) combined with a suction system.

Abstract: The present invention relates to a method for machining of a surface (31) of a roll in a twin-wire press (2), comprising lower rolls (4, 6, 8, 25?), an endless lower wire (10), upper rolls (14, 16, 18, 25?), and an endless upper wire (12). The rolls comprise a coating (32). An apparatus (50) having a movable machining tool (54) for machining of the coating (32) is arranged in connection to a space between a wire (10, 12) and a roll (4, 6, 8, 14, 16, 18, 25?, 25?). The machining tool (54) of the apparatus is moved, in contact against the surface of the roll (31) for cutting of the coating (32) to a desired level during rotation of the roll. The present invention also relates to an apparatus (50) for machining of a surface (31) of a roll in a twin-wire press for dewatering of a fiber suspension comprising said apparatus.

Abstract: A method and a device are for compacting a web of endless fabric including a nonwoven. According to the method and device, the web of endless fabric is subjected to the following treatment steps: a) impinging the web of endless fabric with a pressurized liquid; b) sucking off liquid; c) squeezing off liquid; and d) drying the web of endless fabric.

Abstract: The present invention relates to a twin wire former in a machine for the production of a fiber web, especially a paper or cardboard web from at least one fiber stock suspension, including a vertical twin wire segment having two wires running over a peripheral area of a turning element, especially a guide roll whose surface is preferably not equipped with suction and is smooth or substantially smooth; and in that at least one separation element, such as a transfer suction box is provided indirectly or immediately following the guide roll that separates the top wire from the bottom wire on which the fibrous web is supported.

Abstract: A method for treating a web of paper or board with a wetting substance or calendering the web prior to the cylinder dryer section of a paper- or boardmaking machine while the solids content of the web is still very low, typically in the range of 10–60%, wherein the web can be conveyed when so desired fully supported from the wire section of the paper- or boardmaking machine up to the winder, while simultaneously utilizing the quality benefits obtained from a controlled reduction of the web moisture content and dewatering of the same. The web is conveyed supported by a transfer belt (9) through at least one web surface treatment apparatus such as a coater station (S1B) or a calender prior to passing the web to the first dryer cylinder group (1) of the paper- or boardmaking machine. One nip (11, 13) supported by a transfer belt (9) is suitable for dewatering simultaneously with the application of a treatment substance to the web.

Abstract: A tissue sheet is made using a modified wet pressed tissue machine employing an integrally sealed air press. The apparatus includes: a forming roll; a drying cylinder positioned downstream of the forming roll; an air press positioned between the forming roll and the drying cylinder; a molding fabric adjacent a first fabric such that both fabrics travel through the air press, and wherein the air press is installed to direct a pressurized fluid through the molding fabric first and then through the first fabric; and a pressure roll adjacent the drying cylinder for pressing the molding fabric against the drying cylinder.

Abstract: The invention relates to a twin wire former (1) for producing a fibrous web (4), in particular a paper, cardboard or tissue web, from a fibrous suspension according to the generic terms of claim 1. The twin wire former (1) is characterized in that, the two wire belts (2, 3) run upwards after a passing a first deviation device (10), forming an angle (?) relative to an imaginary second horizontal plane (H2), in such a way that the upper vertex (15.SO) of the second deviation device (15) lies above the lower vertex (10.SU) of the first deviation device (10), and that the angle (?) relative to the imaginary first plane (H1) runs downwards.

Abstract: A former for producing a tissue web and a process of making a tissue web using the former. The former includes a forming element, an inner dewatering belt, and an outer dewatering belt. The inner and outer belts converge to form a stock inlet nip. The inner and outer belts are guided over the forming element and thereafter separating from one another in the area of a separation point. At least one suction element is positioned adjacent the inner belt on a side which is opposite the outer belt. Alternatively, a conditioning device is positioned adjacent the outer belt. The process includes forming the tissue web in the area of the forming element, guiding the inner and outer belts around the forming element, and separating the inner and outer belts in the area of the separation point. Alternatively, the process includes conditioning the outer belt.

Abstract: Printing paper or paperboard of 30-200 g/m2 grammage is made in a machine with a wet section, press section and drying section. The web passes through a roll press with a double-felted roll-press nip, then in a shoe press with an extended single or double-felted shoe-press nip, and pressed in a deflection-compensating roll press, having a double-felted roll-press nip and open press rolls. The web travels at at least 1,200 m/min.; is subjected in the roll-press nip to a linear load from 100 to 300 kN-m and a specific pressure from 5 to 15 MPa; and is subjected in the shoe-press nip to a linear load from 500 to 1,500 kN/m and a specific high pressure from 4 to 13 MPa, to obtain a dewatered web with a dry-solids content of at least 38 percent after the roll-press nip and at least 45 percent after the shoe-press nip.

Abstract: The present invention relates to a system and method of making paperboard and paperboard corrugation that negates the steps of winding rolls of containerboard on machine reels of separate paper machines, subsequent rewinding and slitting of paperboard and unwinding rolls of containerboard on separate corrugators.

Abstract: A board machine and method for making a multilayer cardboard web, in which a first layer of the web having a printable surface is formed in a first forming unit and carried on an extended forming wire thereof through a couching unit where the first layer is couched with one or more additional layers, the multilayer web then being carried on the extended wire to a pick-up point. An upper press felt of a double-felted press picks up the web at the pick-up point such that the printable surface faces downward and contacts the lower press felt through the nip of the press. The lower felt is smoother than the upper felt, and the lower felt contacts the lower press roll for a minimum sector angle beyond an exit of the nip to ensure that the web follows the lower felt.

Abstract: An apparatus for imprinting, drying, and reeling a fibrous web comprises a hot press including a pair of press members forming a nip therebetween for passage of the web therethrough and at least one clothing arranged to pass through the nip of the press with one side of the web in contact with a surface of the at least one clothing. The apparatus also includes a heat transfer device defining a heatable surface, the heat transfer device being arranged to pass through the nip of the press with the opposite side of the web in contact with the heatable surface, and a heating device operable to heat the heat transfer device such that the heat transfer device heats and dries the web during contact therewith. The apparatus further includes a reel-up including a rotatable reel spool onto which the web is reeled to form a finished roll of web material.

Abstract: An arrangement for adjusting the width of a fibre web in an apparatus comprising two filter wires permeable to water, the filter wires having the same direction of travel, and a conduit for placing pulp suspension between the wires. The arrangement comprises channel for feeding water between the wires and to the edges thereof.

Abstract: A system and method for transferring a nonwoven web in a wet papermaking process to a fabric is disclosed. The system includes a vacuum shoe that operates in conjunction with a transfer shoe. The vacuum shoe is contacted against a carrier fabric which is designed to receive the nonwoven web. The transfer shoe, on the other hand, is configured to contact a transfer fabric from which the web is transferred. The transfer shoe includes an air nozzle which contacts the nonwoven web with a pressurized gas as the web is drawn towards the vacuum shoe. The system of the present invention is particularly well suited to processing lower basis weight webs and can be used in rush transfer processes.

Abstract: A wet section of a machine for producing a fibrous material web that includes at least one press. The press includes a nip through which the fibrous material web is guided. The fibrous material web is preformed in a web forming zone. At least one press is an elongated nip press that is elongated in direction of the web travel. This nip is positioned in a region where the dry matter content of the preformed fibrous material web that comes into the nip is less than or equal to about 15% and, preferably is less than or equal to about 12%. A method for treating a fibrous material web in a wet section of a machine for producing the fibrous material web. The wet section includes at least one press including an elongated nip, at least one press and the elongated nip are elongated in a web travel direction. Further, the elongated nip is positioned in a region of the machine where the dry matter content of the fibrous material web, as it enters the elongated nip, is less than or equal to about 15%.

Abstract: A paper or board machine and a method for passing a paper or board web from a forming section to a press section in a paper or board machine wherein the web is carried on a first wire in the forming section or transferred to a first wire from a forming wire of the forming section. The web that runs on the first 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. The pre-press zone includes an extended nip defined by an extended-nip roll and a smooth-faced press roll, the extended-nip roll having a hose mantle and a press shoe arranged in a loop of the hose mantle. 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.

Abstract: A combination blowbox/saveall system (20) and method for use in conjunction with a pick-up roll (22) of a papermachine (18) around which a carrier fabric (26) and running web (28) are moved in concert utilizes a blowbox section (40) for directing air from a source generally away from the surface of the carrier fabric opposite the web to reduce the likelihood of separation of the web from the carrier fabric and a saveall section (60) joined to the blowbox section in a single device. During operation of the system, at least a portion of the air which is directed away from the carrier fabric by the blowbox section for the purpose of preventing separation of the web and fabric downstream of the pick-up roll is used to dislodge water droplets (72) and other contaminants from the surface of the pick-up roll, and these droplets and contaminants are collected within the saveall section for disposal.

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 prepress for a paper web in a paper machine including a load shoe which is pressed against a backing element, preferably a vacuum roll, by a load pressure generating by a medium, preferably liquid, which at the same time acts as a lubrication medium in the prepress. The load shoe is in direct engagement with a water permeable wire upon which the paper web is supported.

Abstract: A prepress for a paper web in a paper machine including a load shoe which is pressed against a backing element, preferably a vacuum roll, by a load pressure generating by a medium, preferably liquid, which at the same time acts as a lubrication medium in the prepress. The load shoe is in direct engagement with a water permeable wire upon which the paper web is supported.

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: 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: An extended nip press for papermaking machine extracts water from a web of paper on a forming felt passing over a backing roll employing electromagnetic repulsion forces. In one embodiment, a belt is formed with permanent magnets which have thickness oriented poles and a like pole is provided external to the belt surface in non-contacting relation to provide a repulsion force to the belt which is transmitted by the belt to the felt and the paper. In another embodiment, the belt is formed of current-carrying nonferrous material and a repulsion force is formed by inducing current to flow in the belt by causing current to flow in an adjacent coil in non-contacting relation to the belt. In either embodiment, air pressure housing may be positioned over the electromagnet or conductor, to cool the electromagnet and to apply an air pressure force against the belt in the same direction as that of the induced or repulsion force.

Abstract: A transfer apparatus is disclosed for transferring a web from a press nip to a dryer section. The apparatus includes a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip. A press blanket extends through the press nip such that the web is disposed between the blanket and the backing roll during passage of the web through the press nip. A backing drum is disposed downstream relative to the press nip such that the blanket and the web extend contiguously relative to each other from the press nip to the backing drum. A dryer felt cooperates with the backing drum such that the web is disposed between the blanket and the felt during passage of the blanket, web and felt around the backing drum and a transfer mechanism is disposed adjacent to the backing drum for transferring the web without an open draw from the blanket to the felt such that the web follows the felt through the dryer section.

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: The invention relates to the press section in a paper machine. It comprises a roll combination (1-5), the rolls of which form one or a plurality of nips (N1, N2, N3). In addition, the press section comprises members for guiding the paper web through the press section and members for guiding one or a plurality of felts (6, 7) or the equivalent through the press section. The frame construction connected to the press section comprises a front frame (8), a rear frame (9) and an intermediate frame (10) connecting these two from above the press section. At least one roll of the roll combination (3, 5) provided in the press section is fixed to the auxiliary frame (13, 14), which is disposed to be rotatable about a shaft (19, 20). The auxiliary frame additionally comprises members (15, 16), by means of which the auxiliary frame (13, 14) can be detachably locked to the intermediate frame (10).

Abstract: Apparatus for transferring a newly formed paper web from the forming fabric over a couch roll in a papermaking machine includes a transfer roll which guides a pick-up felt into nipping engagement with the paper web over the couch roll. The nip is located intermediate the circumferentially spaced ends of a vacuum zone on the surface of the couch roll. The web with the forming fabric on one side and the pick-up felt on the other side is guided onto the transfer roll surface by the forming fabric downstream of the nip and is transferred onto the pick-up felt. The transfer roll has a vacuum zone located downstream of where it is wrapped by the forming fabric. The application of pressure on the web over the couch roll prior to, and in conjunction with, the nip operates to further dewater the web as well as to facilitate its transfer to the pick-up felt.

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: For dewatering a paper web the pressing or press section has two separate or spaced pressing locations arranged in tandem and comprising extended nips. These pressing locations are each formed between an upper pressing surface and a lower pressing surface. The paper web to be dewatered travels between an upper felt belt and a lower felt belt. One of the felt belts extends through both pressing locations while the other felt belt only travels through the first pressing location as viewed in the direction of travel of the paper web. The paper web is only sandwiched between the two felt belts in the first pressing location. The other felt belt which is guided solely through the first pressing location is diverted away from the paper web directly downstream of the first pressing location by a pivotably mounted guide roll, so that the paper web passes through the second pressing location while being supported solely by the one felt belt guided through both pressing locations.

Abstract: A closed press section in a paper machine is disclosed in which all of the press nips in which substantial dewatering occurs are formed between one or the other of two smooth-faced center rolls and hollow-faced press rolls. The web runs between the nips adhering to the surface of one or the other smooth-faced center roll from the first nip to the last nip along a substantially S-shaped path so that opposite surfaces of the web contact the surfaces of respective ones of the smooth-faced center rolls. The frame construction of the press section includes front and rear frames between which an intermediate space is defined which is open or openable at its top, the front and rear frames not being connected to each other above the press roll combination, at least not permanently. The first center roll is supported on the front frame while the second center roll is supported on either the rear frame, on a separate front part of the rear frame, or on a separate intermediate frame.

Abstract: An apparatus is disclosed for making a paper web from stock. The apparatus includes a first and a second forming wire which cooperate together to define therebetween a web-forming section having a first and a second end. A headbox is disposed adjacent to the first end of the forming section for ejecting the stock between the wires such that the web is formed from the stock during passage of the stock from the first towards the second end of the forming section. A first felt is disposed downstream relative to the forming section with the first felt running contiguously relative to the second wire such that the second wire is disposed between the first felt and the web. A second felt is disposed downstream relative to the forming section and on the opposite side of the web relative to the first felt.

Abstract: A method and a device for controlling a paper web which is leaving a press nip in the press section of a paper-making machine. The paper web is intended to follow a felt after the press nip. Control of the paper web is achieved in accordance with the teachings of the invention by preventing air admission to the side of the felt facing away from the paper web during the expansion phase of said felt after the press nip, whereby a pressure is generated, sucking the paper web against the felt. Air admission to the felt is prevented by means of an impermeable belt which is arranged to travel in a separate loop at the same speed as the felt. The belt extends closely adjacent the felt against the side thereof facing away from the web through one or several press nips and over a distance following said press nip/nips.

Abstract: The invention concerns a dewatering band press. The wires (2) in the press are wider than the rolls (1), and in view of sealing the edge of the pulp web (3), two rails (4) are placed outside the ends of the rolls, the wires running between the said rails, and a sealing beam (5) is placed between the rails and the wires. The solution is durable and reliable, because it has no readily worn abrading parts.

Abstract: A closed press section of a paper machine for removing water from the paper web passing therethrough. A compact press roll combination is provided with several press nips being formed in association with various rolls, and between which the web runs supported by roll surfaces without substantially long free draws. The press section comprises a first nip formed by two press suction rolls, through which two felts pass, the first felt functioning as a pick-up felt and moving the web from a pick-up point through the first press nip, and the second felt moving the web from the first nip to the second press nip of the press section. The second press nip is formed at a lower circumference of a smooth-surfaced, large diameter center roll, through which the second felt runs.

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.

Abstract: A closed press section of a paper machine in which a paper web leaving the wire section of the paper machine is passed, supported by a first upper fabric, through a first double-felted press nip formed by two hollow-faced rolls. The lower fabric in the first double-felted press nip is a second fabric which carries the web forwardly after the first press nip. The press section further includes a smooth-faced central roll against which at least two single-felt nips are formed, the press fabric in the first one of the single-felt nips being constituted by the second fabric. The web is detached from the second fabric and adheres to the face of the smooth-faced central roll and moves along therewith into the next single-felt nip. The press section is devoid of press rolls of the suction type with the first double-felted press nip being formed between two solid-mantle hollow-faced rolls.

Abstract: In a particularly simple construction a twin-wire papermaking machine possesses a reduced number of rolls as well as a compact arrangement. The foregoing and the greatest possible velocity of a through-passed paper web can be obtained by employing non-suction rolls, instead of suction rolls, in a pressing section of such papermaking machine, by upwardly entraining the paper web conjointly with a top or upper wire of a twin wire arrangement and by transferring the paper web to a pressing roll having a smooth surface, and furthermore, by providing at the pressing roll an extended or wide-nip supporting shoe by means of which the paper web is dewatered in an extended pressing nip zone. Advantageously, the dewatered paper web is taken off from the surface of the pressing roll in a downward direction and fed to a drying section of the papermaking machine. The drying section may be arranged below the pressing section and directly adjacent the bottom or lower wire of the twin wire arrangement.

Abstract: A paper machine press with a web being picked off a forming wire and passed through a first two roll nip sandwiched between upper and lower felts, the web transferred to the lower felt and then to a felt of a second press with the second double felted press being an extended nip type formed between an upper roll and a lower concave shoe with a relieved leading edge and a water impervious belt passing through the nip sliding over the shoe with the belt being guided on an annular stationary guide, the web transferred to the upper felt following the extended nip by a suction shoe within the felt and thereafter the web being transferred to a fifth felt.

Abstract: A press roll in a paper making machine comprises a non-perforated inner frame onto which an elastic layered structure is applied, the layered structure including an inner layer having a volume of which a substantial portion is constituted by cavities and an outer layer adapted to act against the inner surface of a looped press felt which passes through the press nip, the outer layer having passages formed therethrough which communicate with the cavities of the inner layer. During operation, the cavities are compressed together and thereby widen or extend the nip zone and, additionally, the cavities act as suction devices to produce a negative pressure in the nip zone following the centerline thereof. A press is disclosed which is formed by the press roll described above and a counter-roll which is provided with an elastic coating and a hollow face. A pair of press felts pass through the nip zone formed by these rolls between which the web to be dewatered is passed.

Abstract: In a paper making machine dewatering press section substantially equally pressing and dewatering of both faces of a freshly felted paper sheet web is effected by running the web through first press roll means providing a double action first dewatering nip between corunning porous dewatering felts, and successively thereafter running the web through a four roll stack providing second, third and fourth nips without an open paper draw. In the second nip the web is run in dewatering felt engagement with one face of the web, and the opposite face of the web is in direct non-dewatering surface compacting roll engagement in such nip. In the third nip both faces of the web are in direct surface compacting engagement with the non-dewatering press rolls. In the fourth nip, a second dewatering felt runs in engagement with said opposite face of the web and said one face of the web is in non-dewatering surface compacting press roll engagement.

Abstract: Apparatus and method for guiding a fibrous web from a press section to a drying section, such as guiding a paper web from the press section to the drying section in a paper-making machine. The apparatus comprises a fetching roll adapted to guide the web passing from the press section onto a drying wire from the drying section passing about the fetching roll, and means for urging the web and drying wire against one another as the web is passed to the drying section, this urging means disposed between the fetching roll and the drying section in a running direction of the web and wire. The method of the present invention comprises passing the web from the press section onto a drying wire passing about a fetching roll, and urging the web and drying wire against each other as the drying wire passes from the fetching roll to the drying section.

Abstract: A press section of a paper machine has no suction rollers. The paper web is first conducted through a first two-fabric press nip supported by a first fabric which, in conjunction with a pick-up roller, serves as a pick-up fabric. The press section has press rollers in closed roller combination defining press nips with each other. A first two of the press rollers are provided with solid recessed surfaces. A third of the press rollers is a smooth-surface central roller of the press section. The second fabric serves as a press fabric at least in the first two-fabric press nip. The web is conducted through the first press nip defined by the first and second press rollers interposed between the first and second fabrics. The web is conducted through a second press nip supported by the first or second fabric. The second press nip is defined between the second press roller and the third press roller.

Abstract: The invention relates to an improvement in a dehydration machine for wood pulp, sludges, or similar fibrous material, composed of a lower strainer operating as a support strainer and an upper strainer operating as the cover strainer, which loop support and reversing rolls and are adapted to pass jointly with the material to be dehydrated coming from a material feed through a wedging section and through pairs of pressing rolls in a pressing section, the improvement comprising a laterally sealed wedging section arranged substantially vertically or at an incline, followed directly by a reversal means provided with a lateral seal, and the pressing section including a group of rolls which at the beginning contains a pair of first and second pressing rolls mounted next to each other, with a pressing roll contacting the second pressing roll.

Abstract: A filter press having a main press with an after-pressing device spaced from the outlet end of the main press which device carries out the final pressing and is composed of at least two press roll pairs (1,2), made up of rolls (3,4,5,6) between which the wires (7,8) belonging to the main press pass with the pulp (9) being filter pressed interposed between the wires and pressed by action of a pressing force (F) directed against the topside rollers (3,5) of the press roll pairs and produced by a force applicator such as a pressure cylinder (10). The pressure ratio (F.sub.1 /F.sub.2) between the topside rollers (3,4) and the bottom side rollers (5,6) is adjustable by the aid of a control setup.