Abstract: The press device for a paper web, such as a calendar, contains a flexible moving element (1a) forming an endless structure, said element forming the shell (1) of a roll, the press device including further a counter roll. Inside the moving element (1a) there is a shoe element (3) that is arranged to support the shell (1a) against the counter roll to form a nip (N). The width and/or the surface contour of the supporting surface of the shoe element (3) guiding the shell of the roll in the nip contact varies in the machine direction and the shoe element is positionable in the machine direction to adjust the nip width and/or length.

Abstract: A process and an apparatus for the manufacture of SC-A paper having a high gloss and high smoothness, wherein the paper arriving from the paper machine is supplied on-line to a supercalender (multinip soft calendar), and wherein the paper travels through a plurality of nips for achieving the desired gloss and smoothness properties. The paper web arriving from the paper machine and supplied on-line to a supercalender (multinip soft calendar) is moistened with steam immediately prior to the first nip of the supercalender and is guided through the first nip before the increased moisture of the surface resulting from the application of steam has dropped below a predetermined value in the range of 12% to 25%.

Abstract: A method for changing the natural frequency of a nip roll construction in a paper or board machine. In the method, the bearing elasticity of a hydrostatic bearing element (10, 20, 30, 40) of at least one roll (1) in the nip roll construction is changed, in which connect the natural frequency of the roll (1) is also changed. The device that carries out the method comprises a pressure medium accumulator (39), which has been connected to the pressure side of a loading element (13, 23, 33) of at least one hydrostatic bearing element (10, 20, 30).

Abstract: A tissue sheet is made using a modified wet pressing machine in a modified wet pressing process employing an integrally sealed air press. After initial formation and conventional vacuum dewatering, the wet web is conformed to the surface contour of a relatively coarse fabric to give the web a textured surface. By creating a pressure differential across the web of at least 30 inches of mercury and an air stream through the web of at least 500 SCFM/in2, the air press noncompressively dewaters the wet web to a consistency of about 30 to about 40 percent prior to a heated drying cylinder. The web is dried to substantially preserve its three-dimensional, throughdried-like texture. The process provides a web having an exceptionally high degree of bulk and absorbency not expected in wet-pressed products.

Abstract: Pressing arrangement of a machine and process for producing a web. The pressing arrangement includes a shoe press unit and an opposing roll arranged to form at least one press nip. The shoe press unit includes at least one press shoe arranged opposite the opposing roll and a flexible, liquid-impermeable press belt arranged to be guided over the press shoe. The opposing roll includes a smooth surface. At least one press felt is arranged to be guided through the press nip along with the press belt and the web. The at least one felt is deflected away from the web, which is picked up by the smooth surface of the opposing roll, such that the at least one felt is guided out of the press nip at an angle greater than or equal to about 10° to a tangent to the opposing roll at an end of the press nip.

Abstract: A paper web is smoothened by passing the web through a pre-calender device on a paper machine before the application of a coating. The pre-calender device comprises at least one pair of steel rolls, one of which is heated, and a liquid application device which applies a thin film of water to the surface of the web which contacts the heated roll before the web enters the nip between the rolls. The web is then dried after exiting the nip either by wrapping the heated roll and/or by applying heat externally to the web.

Abstract: The present invention is a machine for manufacturing a fibrous web from a fibrous suspension, with a sheet forming area that exhibits at least one suction box, which includes a main box with at least one suction box cover that is formed from at least two drainage elements that run laterally to the machine's running direction, border a suction slit, and each has one main body and at least one ceramic. The present invention is identified by the fact that at least one drainage element and/or one format slide exhibit at least one removable edge piece in which is integrated at least one temperature sensor in order to measure the temperature in the ceramic and/or the temperature at an adhesive point between the ceramic and the associated main body and/or the temperature in the main body. The present invention is furthermore a process and a system for monitoring a drainage element.

Abstract: Process and apparatus for drying a material web. The process includes guiding the material web to at least one heated area, maintaining the material web in uninterrupted contact with the at least one heated area at least until the material web achieves a firmness sufficient for detaching the material web from the heated area. The apparatus includes at least one heated area arranged to receive the material web. The at least one heated area includes a removal zone arranged for the removal of the material web from the at least one heated area. The at least one heated area has a length is sufficient to achieve a sufficient firmness of the material web to be removed in the removal zone.

Abstract: A textile machine felt, which can be used, for example, as a compacting felt on machines for rendering textiles shrinkproof, consists of a ground textile (1) and a felt layer (2) which is stitched thereon and comprises at least in its surface region an elastic knit fabric (3), for example, a continuous warp knitted sleeve.

Abstract: Disclosed is method and a pressing device (10) of a paper and/or paperboard machine intended for the treatment of a fibrous web (12) which is formed on a band screen and passes around an appropriate open roller (16) having recessed intended to receive the water squeezed out the fibrous web. The open roller forms with a counterface a first nip (18) which is extended, in the direction of movement of the L band, by a pressing shoe unit (20). A papermaker's felt (22, 24) passes both on the open roller (16) and said pressing shoe unit (20).

Abstract: A tissue sheet is made using a modified wet pressing process employing an integrally sealed air press. After initial formation and conventional vacuum dewatering, the wet web may be conformed to the surface contour of a relatively coarse fabric to give the web a textured surface. By creating a pressure differential across the web, the air press noncompressively dewaters the wet web to a consistency of about 30 to about 40 percent prior to a heated drying cylinder. The web may be dried to substantially preserve its three-dimensional, throughdried-like texture. The process provides a web having an exceptionally high degree of bulk and absorbency not expected in wet-pressed products.

Abstract: Method of producing an impulse dried paper having a three-dimensional pattern of alternating raised and recessed portions, which have been provided in connection with impulse drying, at which the wet paper web (10) is passed through at least two press nips (12a,b), each comprising a rotatable heated roll (13a,b) which is heated and that the paper web during the passage through the press nips is given a three-dimensional pattern of alternating raised and recessed portions either by means of a patterned wire (11′), -band or belt and/or by a pattern on the heated roll (13a,b).

Abstract: A method and machine for the manufacturing a fibrous pulp web including forming a first draining zone and a second draining zone which are successively arranging in a web run direction, applying pressure in the first drainage zone which increases in the web run direction from an initial pressure to a final pressure to drain one side of the web, and applying pressure in the second drainage zone which increases in the web run direction from an initial pressure to a final pressure to drain the other side of the web. The initial pressure in the second draining zone is less than the final pressure in the first draining zone.

Abstract: The invention relates to a former-press section (100, 110) of a paper machine and to a method of transferring a web from a former to a press section. Between the former section (100) and the press section (110) there is a pre-press zone (PP) which removes water from the web (W) and through which the web (W) is passed as a closed draw from the former section (100) to the press section (110). The upper wet wire (10) or the equivalent transfer wire (10A) of the former section (100) is passed through the pre-press zone (PP), the web (W) being passed on the lower face of said wire into and through the pre-press zone (PP). Inside the loop of the upper wet wire (10) or of the equivalent transfer wire (10A) and/or inside the loop of the lower wet wire (20) there are transfer devices (15, 15a, 16, 26) based on the use of a pressure difference.

Abstract: Press device and process for treating a material web. The press device includes a first shoe press and a second shoe press. The first and the second shoe press are successively arranged in a web run direction. A transfer suction roll is positioned between the first shoe press and the second shoe press and is adapted to at least partially suction the material web and to guide the material web in a closed draw through at least one of the first and the second shoe presses. The process may includes at least partially suctioning the material web with the transfer suction roll, and guiding the material web in a closed draw through at least one of the first and the second shoe presses.

Abstract: A method and apparatus are disclosed for making a high bulk, coated paper of a unique structure with the coating forming a lower portion of the total caliper and the paper base forming a higher portion of the total caliper than conventionally made coated paper of the same weight. The process includes the step of using furnish with a high percentage of mechanical pulp, applying that furnish to papermachine wires, preferably with a gap former, coating the paper with a coating containing a plastic pigment, preferably of 4 or more parts per 100 parts of coating pigment, and calendering the coated paper at a nip loading less than conventional supercalendering nip loading. Preferably, the finished coated paper will have a 75° TAPPI gloss of 40 or above. The method and apparatus can be used to make lightweight or other weights of coated paper.

Abstract: A method of producing dimensionally stable paper and/or paperboard products by treating a hygroreactive cellulosic fiber matrix with a hydrophobic sizing agent solution; and drying the treated fibers using heat and/or pressure so that the hydrophobic sizing agent penetrates the fiber matrix making it hydrophobic.

Abstract: A process for the formation of fiberboard where the fiber stock suspension is dewatered on two sides between wires or felts, a top wire being provided in the main dewatering zone.

Abstract: The invention concerns a method for manufacture of paper, most appropriately for porous paper for color powder printing. In the method paper is manufactured by means of a paper machine. In the method the paper stock is fed out of the headbox (100) into the wire part (200), in which wire part (200) water is drained out of the paper web in both directions. In the method the paper web (W) is passed from the wire part (200) into the press section (300) in order to press water out of the paper web (W), and after the press section (300), the paper web (W) is dried in the dryer section (400) and coated/pigmented in the coating section (500), dried in an after-dryer section (600) and calendered in a calender (600), and reeled in a reel-up (800).

Abstract: A process is provided for operating a calender roll including a roll jacket surrounding an inner chamber. The process includes creating an active oscillation in the inner chamber that acts upon the roll jacket. By creating an oscillation within the calender roll, the appearance of undesired bar rings, which form on the external surface of the roll jacket due to operational exciting forces, is avoided. Furthermore, calender roll is provided including a roll jacket surrounding an inner chamber, and at least one actuator provided within said inner chamber acting upon said roll jacket.

Abstract: A seal used in an air press for dewatering a traveling paper web in a paper-making machine includes a support roll having a cylindrical surface, a belt and felt for supporting the paper web on either side thereof, an arm for mounting the seal, a seal body having a curved outer surface contour for substantially conforming to the curve of the cylindrical surface of the support roll, and an inner surface adjacent to the arm. A leading edge surface intersects with the curved outer surface, the leading edge surface defines the initial engagement with the traveling belt when in an operating position. A trailing edge surface intersects with the curved outer surface. The trailing edge surface defines, with the leading edge surface, the upstream and downstream bounds of the extended nip of the curved outer surface contour of the seal body over the support.

Abstract: A method of sealing the pressure chamber of a shoeless press comprising a roll and a concave counterpart provided with a nip pressure chamber and with a press belt by proportioning the edge radius of the pressure chamber and the radius of the path of the belt to the pressures acting under the belt. A pressure is generated under the press belt, outside the press chamber, with the aid of oil or gas, and a suitable lubrication leak is allowed from the pressure chamber by adjusting the pressure in the right proportion to the chamber pressure. The invention also includes an apparatus for carrying out the method.

Abstract: Press arrangement and process for treating a fibrous material web that includes two shoe press rolls and a counter-roll, associated with the two shoe press rolls, positioned to form a first and a second press nip with the two shoe press rolls. The first and the second press nip are elongated in a web travel direction. The press arrangement also includes a plurality of felts, such that two of the plurality of felts are guided through at least the first press nip. The process includes transferring the web onto a pick-up felt, in which the pick-up felt is one of the two felts guided through at least the first press nip, and dewatering the web between the two felts in the first elongated press nip.

Abstract: Press section of a machine and process for producing a fiber web. The press section includes at least two press nips arranged in succession in a web travel direction. Each of the at least two press nips is formed by two press rolls. At least one continuously revolving press belt is guided around each press roll. At least one of before and after at least one of the at least two press nips, a guide region is formed in which two of the press belts are arranged to run jointly along a straight path, and the fiber web is adapted to run between the two press belts along the straight path. Guide elements are arranged at an end of each guide region. At an end of each guide region, the press belts are guided over the guide elements to run separately from one another, and a press belt angle between the press belts at the guide elements is greater than approximately 15°.

Abstract: The present invention is a method of making an ultra soft, multi-ply tissue from non-premium furnish using wet press technology and the product produced thereby.

Abstract: The present invention relates to a method of and an apparatus for providing fluid distribution materials with improved wicking properties in a preferential fluid distribution direction. Such fluid distribution materials are particularly useful in absorbent core structures such as used in disposable absorbent articles like baby diapers, incontinence products or catamenial products. The invention is concerned with applying a special mechanical treatment to distribution materials, by which the softness and the fluid handling properties of the materials are improved.

Abstract: Microgloss variations in and microgalvanizing of supercalendered webs of paper are significantly reduced without significant reduction in the super-calendered paper gloss by passing the supercalendered web through a heated soft extended nip calender.

Abstract: Cellulosic webs, such as tissue webs, can be dewatered to consistencies of about 70 percent or greater in a high intensity extended nip press while retaining a substantial amount of bulk. While webs intended for use as tissues containing conventional furnishes become overly densified when passed through a high intensity extended nip press, furnishes containing certain types of fibers, such as chemically cross-linked or heat-treated fibers, resist compression and allow the compressed web to retain a high level of bulk after a high degree of dewatering.

Abstract: A device for dewatering solid/liquid suspensions, especially pulp suspensions, where the suspension is dewatered between two belts, with one dewatering zone being a wedge zone. A pair of rolls downstream of the wedge zone impart both area pressure and line pressure on the pulp web formed by the pulp suspension.

Abstract: Process and device for transferring at least one of a fibrous material web and a strip of the fibrous material web from a moist releasing belt to an accepting belt in a web producing machine that includes a transfer region and a separating region arranged in this order in a web travel direction. The process includes guiding the accepting and releasing belts together at least in the transfer region, separating the accepting belt from the releasing belt in the separating region, and suctioning a surface of the accepting belt opposite a fibrous web and strip carrying surface so that the strip and the fibrous material web are carried by the carrying surface. When the strip is being transferred, the suctioning occurs at least the transfer region, and when an entire width of the fibrous material web is being transferred, the suctioning occurs at least primarily in die separating region.

Abstract: A press arrangement and process for treatment of a fibrous material web. The press arrangement includes a press shoe unit, a press suction roll, at least one first press nip elongated in a web travel direction, the first press nip being formed between the shoe press unit and the press suction roll, the press suction roll being arranged as a web pick-up roll, at least one second press nip elongated in the web travel direction and positioned downstream of the first press nip relative to the web travel direction, at least first and second felts being arranged to be guided through the at least one first press nip, the first felt being arranged to loop around the press suction roll to pick-up the web from a screen belt whereby the web is transferred from the screen belt to the first felt, wherein the web is guided to the first press nip by the first felt and the web is guided through the first press nip between the first and second felts.

Abstract: A device for processing a continuous fiber web includes a membrane, a pressurized enclosure, a tension roll and a guide roll. The pressurized enclosure includes at least a first roll and defines an air press chamber. The first roll partially defines the air press chamber and carries the membrane. The tension roll also carries the membrane and is movable toward and away from the first roll. The guide roll further carries the membrane and is positioned between the first roll and the tension roll. The guide roll has opposite ends, at least one of which is pivotable toward and away from the first roll.

Abstract: Press section and method of using the same for drainage of a fibrous material web that includes a shoe press roll, a cylindrical counter roll, at least one nip, a first nip of the at least one nip formed by the shoe press roll and the cylindrical counter roll, and at least one press felt. The at least one press felt is disposed on each side of the fibrous material web. The at least one press felt travels through a last nip of the at least one nip where the at least one press felt is separated from the fibrous material web and conveyed away after leaving the last nip. The drainage capacity and the reliable guidance of the fibrous material web are improved.

Abstract: Suction box in a paper machine including a vacuum chamber, a deck or a number of substantially U-section holders open toward a wire and ribs arranged in the deck or the holders so that they can be loaded against the wire. At least in a running situation, the deck of the suction box is curved or the ribs are arranged to provide a curve run of the wire so that the wire tension of the curved run over the deck or ribs serves to lower a normal force which is produced by the vacuum present in the suction box and which is effective between the wire and the deck or ribs.

Abstract: A paperboard product having at least one layer of bleached or semi-bleached pulp and having improved smoothness and reduced bulk loss. For paperboard having sizing without pigment, the smoothness on the printed side as measured by the Parker test is better (lower) than 6.5 when measured using a pressure of 10 kgf/cm2 while the smoothness measured by the Hagerty/Sheffield test is not below 280 Sheffield units. For paperboard having sizing with pigment, the Parker smoothness is less than 5.0 and the Hagerty/Sheffield smoothness is not less than 180 Sheffield units. The web is finished by applying temperature and moisture gradients to the web and then smoothing the web surface using extended nip calendering. The surface of the calendering roll is maintained at a temperature of 250-400° F. Prior to entering the extended nip, the web surface is moisturized using steam showers. The nipload applied in the heated extended nip is preferably in the range of 300 to 2,500 pli.

Abstract: A method of producing dimensionally stable paper and/or paperboard products by treating a hygroreactive cellulosic fiber matrix with a hydrophobic sizing agent solution; and drying the treated fibers using heat and/or pressure so that the hydrophobic sizing agent penetrates the fiber matrix making it hydrophobic.

Abstract: A calendering method which enhances the smoothness of surface sized paper/paperboard by a combination of temperature and moisture gradient calendering processes without the fiber sticking/picking problems that affect runnability and without using waterboxes. The moisture gradient calendering is performed so that the cross direction moisture profile can be corrected and high smoothness levels can be obtained. Heated calender rolls form a hot pressure nip having a temperature greater than the temperature of the moisturized web. Lubricant is applied to both sides of the web to prevent fiber sticking/picking in the hot nip. The lubricant may be applied by the size press, by the moisturizing showers or by separate lubricant showers. The smoothness developed by moisturizing and hot nip calendering is substantially irreversible.

Abstract: A method for detecting contamination on or damage to a web-contacting face in a paper machine or a paper finishing machine, including the steps of detecting vibrations of the web-contacting face over a period of time by means of a plurality of detectors arranged in association with the machine and determining the location of the contamination on or damage to the web-contacting face based on the time the vibrations were detected.

Abstract: The process is used for the production of high-quality glazed paper and includes the three process sections, stock preparation (1), paper formation (2), and glazing (3). According to the invention, the paper fibers used in the performance of the process are subjected to fiber loading, such that substances which reduce the compressibility of the fibers are incorporated in the cavities of the fibers. In combination with the glazing process (3), a paper with particularly high optical quality can then be produced.

Abstract: The specification discloses embodiments of a process and related apparatus for conditioning a fibrous web in order to improve the efficiency of drying and calendering thereof. In the process, a moving fibrous web is conditioned after the drier unit of a papermaking machine by applying a flow of moistened gas through one or more arrays of radial jet reattachment nozzles placed in close proximity to the web surface prior to a calendering unit or prior to a steaming unit placed between the nozzles and the calender unit to cool the web and/or increase its moisture content. Webs treated according to the invention exhibit improved properties including less moisture streaking, enhanced smoothness and avoidance of optical property loss.

Abstract: Device and method for draining a web in a paper production machine. The device may include a press section having at least one press nip for draining and smoothing the web. The at least one press nip may be arranged to smooth one surface of the web more than its opposite surface and the device may also include a roughening device that roughens the one surface of the web. The method may include guiding the web through a press section of the paper production machine to drain and smooth the web in which the press section include at least one nip, smoothing one surface of the web more than its opposite surface in the at least one nip, and roughening the one surface.

Abstract: A sealing construction for loading a seal against a suction roll in a paper machine includes a seal having a wear surface, side surfaces and a lower surface. The seal is fitted from its holder to the structure of a suction box which is inside the suction roll. The seal essentially covers the whole operating length of the suction roll, extending from its wear surface to the inner face of the mantle of the suction roll. The seal is moveable in the direction of the radius of the suction roll in the holder by a pressure effect that is applied directly onto the lower surface of the seal. Negative pressure or vacuum can be applied during operation to draw the seal into its holder to reduce seal wear.

Abstract: Process and apparatus for glazing a material web so as to influence or control the transparency of a material web. The material web is guided through at least one nip which is formed by a roller having an elastic covering made, in particular of a plastic reinforced with fibers or appropriate fillers, and an opposing roller. In one embodiment, a primary orientation of the fibers in the covering is selected as a function of the desired glazing result. In another embodiment, the roller surface has uniform nonhomogeneous hardness distribution over a substantial portion of its rolling surface.

Abstract: A method and machine for the manufacturing a fibrous pulp web including a first draining zone and a second draining zone, where the first and second draining zones are successively arranged in the web run direction, where a first side of the web is drained in the first draining zone by pressure acting on the web which increases from an initial pressure to a final pressure, where a second side of the web is drained in the second draining zone by pressure acting on the web which increases from an initial pressure to a final pressure in the web run direction, and where the initial pressure in the second draining zone is less than the final pressure in the first draining zone.

Abstract: A method for making a throughdried tissue sheet is disclosed. The method includes the steps of depositing an aqueous suspension of papermaking fibers onto an endless forming fabric to form a wet web. The wet web is then transferred to a throughdrying fabric such that the wet web has a fabric side in contact with the throughdrying fabric and an opposite air side facing away from the throughdrying fabric. The wet web is routed over a throughdryer to dry the web. The web is then transferred to a Yankee dryer for further drying and is creped from the Yankee dryer to obtain a creped web having a basis weight of about 15.2 pounds per 2880 square feet. The creped web in then calendered in a calendering unit that includes a smooth calender roll and a resilient calender roll. The resilient calender roll has an exterior covering formed of ethylene propylene diene polymer and the creped web is oriented such that the fabric side is disposed toward the resilient calender roll.

Abstract: The present invention is a method for maximizing water removal from an absorbent web in a press nip. The present invention uses a pressing unit with a pressure profile that maximizes water removal in the press section or on the Yankee dryer of a paper machine. The pressure profile of the pressing unit according to the present invention has a very steep pressure drop at and/or following the exit of a pressure distribution curve in order to maximize water removal by minimizing rewet of the web. The improved pressure profile according to the present invention results in increased water removal and/or improved line speed.

Abstract: Calender and method for treating a material web. The calender includes a plurality of rolls in which each roll has a rotational axis. The rotational axes of the plurality of rolls are arranged to be substantially located in a press plane, and a plurality of nips are formed between adjacent rolls. A control device is provided to selectively open and close the plurality of nips, and the rolls are arranged so that at least two opened nips are positioned between two closed nips. The method includes forming a closed nip with the top roll, forming a closed nip with the bottom roll, forming at least two open nips between closed nips, and guiding the material web through at least the closed nips.

Abstract: An air press for noncompressively dewatering a wet web to consistency levels not previously thought possible at industrially useful speeds without thermal dewatering.

Abstract: Process for dewatering a fibrous web in a dewatering press including a counterpart face, a shoe press unit having a revolving flexible press belt and at least one press shoe such that the at least one press shoe is arranged to press the flexible press belt against the counterpart face, at least one nip formed by the flexible press belt being pressed against the counterpart face having a length extending in a web travel direction and being at least substantially similar to a length of the at least one press shoe in the web travel direction, and a device that guides the fibrous web and at least one dewatering belt being guided through the extended nip. The process may include pressing the fibrous web within the extended nip, determining a dwell time of the fibrous web within the extended nip, and maintaining the dwell time at less than approximately 12 ms. The dewatering press may include a counterpart face and a shoe press unit that includes a revolving flexible press belt and at least one press shoe.

Abstract: A method for the treatment of a material web and a press arrangement with a plurality of press gaps. A roll has a flexible press jacket supported from an inside, and forms a respective press gap with each of at least two further driven rolls. The drive power, or speed of one of the driven rolls, is regulated in accordance with a predetermined desired value, to ensure a common speed of the driven roll. A maximum line force and/or drive power of a front press gap, considered in a web running direction, is controlled and/or regulated, at least within a certain range, in accordance with a maximum line force, or drive power, of a rear press gap, considered in the web running direction.