Abstract: An enclosed extended nip press apparatus is disclosed for pressing water from a formed web. The apparatus includes a frame and a backing roll rotatably secured to the frame. A press member cooperates with a backing roll for defining therebetween an extended nip for the passage therethrough of the formed web. A press blanket extends in a closed loop through the nip, the blanket having a first and a second lateral edge and an inner and an outer surface. A first and a second head are rotatably secured to the press member with the first and second heads being disposed adjacent to and cooperating with the first and the second edges respectively of the blanket. The first and the second heads define first and second annular channels respectively for the reception therein of the first and the second lateral edges respectively of the blanket. A first and a second annular seal are disposed within respectively the first and the second channels with the seals contacting the respective edges of the blanket.

Abstract: A press section apparatus defining a press nip is disclosed for pressing a web of paper. The apparatus includes a frame and a press member secured to the frame. A backing roll is rotatably secured to the frame with the backing roll cooperating with the press member for defining therebetween the press nip. The backing roll also includes a shaft which has a first and a second end. The ends of the shaft are secured to the frame and a shell defines a granite outer surface with the shell being disposed substantially coaxially relative to and around the shaft. The shell is rotatable relative to the shaft and a deflection compensating device compensates for relative deflection between the shell and the press member during passage of the web through the press nip.

Abstract: A bearing blanket is disclosed which extends through an extended nip defined by a shoe and a cooperating backing roll for pressing water from a formed web. The blanket includes a woven-base fabric which defines a web side and a shoe side, and a single liquid impervious urethane layer which is applied to the web side of the base fabric such that the urethane layer thoroughly penetrates into and through the base fabric. The arrangement is such that when the urethane layer is cured, the urethane layer defines a web face and a shoe face. The web face is spaced relative to the web side, with the web face defining a plurality of vents for conveying water pressed from the web away from the extended nip. The shoe face is substantially co-planar with the shoe side of the base fabric such that the shoe face is relatively smooth for cooperating with and moving relative to the shoe.

Abstract: The method includes the steps of coating the peripheral surface of a roll with a film of plasticizer. An offset roll disposed adjacent to the roll is rotated such that the roll and the offset roll define therebetween a transfer nip so that a film of the plasticizer is transferred to the offset roll. The web is moved past the offset roll such that the web contacts the offset roll downstream relative to the transfer nip so that the film of the plasticizer is offset onto the web. The web is then passed with the offset coating of plasticizer through a calendering nip such that between the offset coating of the web and the subsequent calendering of the web with the offset coating, the plasticizer is permitted to uniformly and controllably penetrate into the web such that the Z-directional compressibility of the web is controlled prior to the web extending through the calendering nip.

Abstract: The present invention relates to a press blanket for pressing water from a formed web which extends through an extended nip defined by an elongate press shoe and a cooperating backing roll. The blanket includes a single layer of fiber reinforced urethane which defines an endless loop. The layer cooperates with the press shoe and extends through the extended nip for pressing the water from the formed web. The single layer has an inner and an outer surface and a first and a second edge zone. The inner surface slidably cooperates with the press shoe and is smooth. The inner surface has a diameter which is reproducible to within a predetermined tolerance range. The outer surface defines a plurality of parallel-spaced circumferential grooves for assisting the drainage of water from the formed web during passage of the web between the outer surface and the backing roll.

Abstract: A long-nip press roll and a mating roll form an areal press nip with each other. The long-nip press roll has a flexible tubular press shell which is mounted by means of two support disks on a stationary support member which extends through the inside of the press shell. Within a hydraulic pressure chamber provided on the supporting member is a radially displaceable press shoe which can press the press shell against the mating roll. Support member, pressure chamber and mating roll are arranged symmetrically relative to a press plane. The slide surface of the press shoe which contacts the press shell is arranged offset with respect to the press plane in the direction opposite the direction of travel of the press shell. The axis of rotation of the press shell and its two support disks is also arranged offset out of the press plane in the direction opposite the direction of travel of the press shell.

Abstract: A long nip press roll includes a stationary support member and a flexible, tubular, inflatable press shell which is supported to rotate around the support member by axially separated support discs rotatable around the support member. A radially displaceable press shoe is supported on the support member for pressing outward against the press shell against a counter roll in the press plane. To enable the press roll to be used in a press where it is disposed either beneath or above the counter roll, all of the internal lines in the support member, e.g. those for the supply and discharge of pressure oil, lubricant and cooling oil and press shell pressurizing air, include two sets of coupling for coupling them to external lines, a respective set of the couplings being located at each axial end of the press roll. During assembly, one of the sets of couplings at one end is connected to external lines, and the other set of couplings is closed.

Abstract: A press with extended nip for paper and board machines includes a support element acting as counter member; a pressure element disposed opposite the support element, designed to be secured to a stand, and including a press shoe which, together with the support element, forms a pressing zone with extended nip; at least one endless movable fluid-impervious belt, being arranged to pass through the pressing zone in sliding contact with the press shoe; and at least one endless liquid-absorbing felt, arranged to pass through the pressing zone together with a fiber web to be dewatered.

Abstract: A press with extended nip for paper and board machines includes a support element acting as a counter member; a pressure element disposed opposite the support element and including a press shoe and a carrying element carrying the press shoe and designed to be secured to a stand, the press shoe, together with the support element, forming a pressing zone with extended nip; at least one endless movable fluid-impervious belt, being arranged to pass through the pressing zone in sliding contact with the press shoe; and at least one endless, liquid-absorbing felt, arranged to pass through the pressing zone together with a fiber web to be dewatered.

Abstract: An extended nip press apparatus is disclosed for pressing water from a web. The apparatus includes a press frame and a backing roll rotatably secured to the frame. An elongate shoe is connected to the frame, the shoe being movable relative to the roll. The shoe defines a concave surface having a lubricant thereon. The concave surface cooperates with the roll for defining therebetween an extended nip. An endless blanket having a first and a second lateral edge is slidable relative to the shoe, the blanket extending contiguously with the web through the nip such that the web is disposed between the blanket and the roll for pressing water from the web. First and second beads are connected to the first and second edges respectively, the beads extending continuously around the respective edges.

Abstract: A bulky, embossed, fibrous web material having a basis weight in the range of 5 to 50 lbs./ream and geometric means tensile strength (TS) (kg/3" width), apparent bulk (AB) (cal. pts./lb. ream), and oil holding capacity (OH) (ml/gm fiber) substantially satisfying, in absolute values, the relationships (0.27 BW-1) TS>(0.17 BW-1), AB>[0.7-(TS.div.20)], and OH 0.063TS.sup.2 -1.13TS+8.6. The invention includes an apparatus and a method of manufacturing the product comprising wet pressing a fibrous web to about 30% to 50% solids, conveying the web to a transfer position proximate the three-dimensional surface of an embossing fabric moving at a speed less than that of the web at the transfer position, and applying a vacuum to the web through the embossing fabric to transfer and conform the web to the three-dimensional surface of the fabric, the vacuum magnitude being in the range of 1 to 20 inches Hg.

Abstract: A sheet of fibrous web material having opposite smooth surfaces, an apparent bulk in the range of about 0.10 to about 0.20 caliper pts/lb ream and a machine direction stretch of at least 8%, wherein surface undulations on the opposite smooth surfaces of the sheet have an amplitude variance of less than 0.0002 inch. The invention includes an apparatus and a method of manufacturing the product comprising partially dewatering a wet fibrous web to about 30% to 50% solids, conveying the web to a compression nip defined by a smooth-surfaced roll and a smooth-surfaced fabric material, moving the fabric material at a speed of about 10% to 20% less than the surface speed of the smooth-surfaced roll, compressing the web in the nip with a compression force of less than 15 lbs/linear inch, with an average pressure of less than about 50 psi in the compression nip, and drying the web. The dried web has an apparent bulk less than 0.20 caliper pts/lb ream.

Abstract: A guiding apparatus is disclosed for guiding an extended nip press blanket relative to a pressing shoe. The apparatus includes a nose member which is pivotally-connected to the shoe for guiding the blanket relative to the shoe. An actuator is secured to the shoe for pivoting the nose member relative to the shoe. A connector extends between the actuator and the nose member for connecting the actuator to the nose member such that when the actuator is actuated, the nose member is skewed relative to the shoe so that the blanket is guided laterally relative to the shoe as the blanket moves over, and in contact with, the nose member.

Abstract: A pressing machine includes a roller and a pressing shoe which can be moved towards and away from the roller to exert pressure on the roller or on a material in a gap between the shoe and the roller. The shoe is mounted in a pressure chamber to which hydraulic pressure medium can be supplied to move the shoe. Upon movement towards the roller, the shoe applies pressure over a zone extending for a part of the circumference of the roller. Means is mounted on the pressing shoe for altering the length of this zone in the circumferential direction of the roller. To this end, the shoe may have two movable jaws which establish said zone, the jaws being movable by adjusting means over a cylindrical surface of said shoe which has substantially the same centre of curvature as the roller. The pressing shoe is particularly advantageous in a paper machine for dewatering a web of paper or for supporting the rollers of a rolling apparatus.

Abstract: A system of treating web material wherein the web is transported within a differential relative velocity nip defined by a web support surface and a pick-up member having voids, therein and having a relative velocity differing from that of the support surface at the nip location. Substantially simultaneously with the web treatment the web is applied to the pick-up member with the web impressed into the voids to lock the web against movement relative to the pick-up member.

Abstract: A dryer for paper and similar fibrous web materials including a dryer roll having an outer cylindrically-shaped wall, a radiant heat source within the dryer roll adapted to heat the wall substantially uniformly about the entire periphery thereof, and nip-forming means forming a pressure nip with the dryer roll.

Abstract: An extended nip press for removing water from a traveling web in a paper machine including a press roll with an elongate shoe having a concave surface facing the roll and forming an extended nip therebetween with the shoe pressed to the roll and mounted to accommodate movement to form a wedge of lubricant between the shoe and a belt with the ends of the belt closed by end walls to contain lubricant within the belt and a flexible radial connection between the end walls and the ends of the belt so that the belt will follow the curvature of the nip beyond the ends of the shoe and will flex only in a single plane of the nip.

Abstract: A tandem calender is provided at the output end of a paper machine which includes two single stack nips in-line. The first nip is formed by a pair of steel rolls which are lightly loaded and the second nip is formed by a steel roll and a plastic covered roll which is loaded 2-10 times greater than the first nip.

Abstract: In a wet press for dewatering a web of material, for instance a paper web, a contact pressure device is provided which presses against a rotating roll and exerts an incrementally increasing pressure in the direction of travel of the paper web. The contact pressure device comprises only a single pressure element arranged in the direction of travel of the paper web. The pressure element has two or more pressure pockets arranged sequentially in the direction of web travel and which are connected with a common pressure chamber by conduits. The increasing contact pressure is attained by arranging the pressure element unsymmetrically in relation to the pressure chamber. The effective pressure cross-sectional areas of pressure pockets arranged sequentially in the direction of web travel can additionally be reduced in the direction of web travel or the cross-sections of the associated bores can be increased.

Abstract: An extended nip press for removal of water from a web of fibers experiences a press shoe expansion and deformation problem due to uneven heating of the press shoe under load. The press nip includes a rotatable press roll, which is opposed to a press shell or jacket that rides over a press shoe that is supported in a recess on a supporting member. The press shoe has an upper part with a top surface on which the press belt slides through the press nip and has a lower supporting part. The upper and lower parts are heat insulated by an inserted insulating layer. The upper and lower parts are form locked by a spline connection toward the inlet side of the press nip. To avoid heat-caused deformation of the press shoe, the lower supporting part has a greater moment of resistance against flexure than the upper part due to their respective cross-sections.

Abstract: The belt press unit of a paper machine includes an elastic tubular press belt which passes around the circumference of and is spaced from the surface of a hollow, annular supporting body. A press shoe in the supporting body presses outwardly and urges the press belt against an opposing surface on a mating roller for defining a press nip. Circumferentially outside of the press zone, each of a plurality of circumferentially spaced guide ledges extends across the direction of travel of the belt. A torsionally rigid beam extends through and is attached at two axially spaced locations along the hollow of the annular supporting body. At least one of the guide ledges is supported to the beam, whereby radial deflection of the supporting body does not result in radial deflection of the beam and thus does not cause radial shifting of the guide ledge. The beam is axially displaceable with respect to the supporting body.

Abstract: The disclosure concerns a press device for a paper making machine, and particularly concerns an extended nip press. A hollow tubular, stationary support body extends around a supporting beam, which is a flexing beam. Hydraulic piston-cylinder combinations extend between the beam and the supporting body in a press plane. A radially non-displaceable press shoe is supported on the support body and faces toward a counter-roll to define a press nip between them. The outwardly facing surface of the press shoe is concave in the circumferential direction of the support body. The amount of pressure in the hydraulic supporting means determines the press force which prevails in the press zone.

Abstract: In a wet press for dewatering a web of material, for instance a web of paper, a contact pressure device presses against a rotating roll and exerts a pressure which increases in the travel direction of the web of paper. For this purpose, several rows of contact pressure elements are arranged sequentially in the travel direction of the web of paper. In each row the contact pressure elements are arranged side by side transversely to the travel direction of the web of paper. In order to circumvent a differential dewatering at the location of the contact pressure elements and at the gaps between the contact pressure elements of a row, the contact pressure elements of successive rows are shifted or staggered in relation to one another transversely to the web of material such that they mutually overlap. This prevents the arisal of strips in the paper being processed.

Abstract: In a belt pressing unit, which preferably serves as wet press of a paper machine, an elastic tubular press belt travels around a supporting body and, together with a back roll, forms an extended press zone. Beyond the press zone along the path of the press belt, liquid is fed to the inner side of the press belt in order to cool the press belt. This liquid is permitted to travel, together with the press belt, around the supporting body. Most of the liquid is then removed from the press belt, preferably at a position in front of the press zone. The liquid may then be cooled and fed back to the press belt. In addition, liquid may also be fed to the inner side of the press belt where the press belt enters the press zone, for cooling and lubricating a pressing surface of a press shoe which presses the press belt toward the back roll.

Abstract: An extended nip press having a press nip formed between a first press roll and a looped traveling belt wrapping a portion of the roll with the belt having a shaped mandrel therein with a concave surface conforming to the roll facing the nip and a concave surface facing away from the nip conforming to a support roll with lubricant between the mandrel and belt and the rolls having a deflection control means with the mandrel being self-positionable during operation of the press.

Abstract: A supercalender at the output of a paper machine includes two pairs of zone-wise deflection-controlled rollers. Each pair has a hard surface roller and a soft roller with an elastic outer layer or covering having a minimum hardness of 85.degree. Shore D. The hard rollers are disposed on one side and the soft rollers on the other side of the travel path of the paper.

Abstract: The invention relates to a papermaking machine employing a differential pressing felt for simultaneously dewatering the paper web and imprinting the paper web as the web is deposited onto the surface of a heated drying cylinder. The felt has a felt facing material greater than about 153 grams/m.sup.2 and imprinting yarn strands forming knuckles adjacent to the felt facing. The yarn strands have a spacing of about 6 to about 25 0.0254 meters.

Abstract: The disclosure concerns a press roll for pressing a web passing through a nip between the press roll and an 2 associated roll, particularly in a paper making machine. The press roll includes a rigid inner shell and flexible, elastic outer shell which rotates around the inner shell. An outwardly pressurized elongate pressure ledge is placed in the inner shell at the nip to produce an elongated nip and to be pressurized in opposition to the associated roll at the nip. In an alternate embodiment, the pressure ledge has a pressurized, outwardly facing recess facing the outer shell. A drive roll drives the outer shell to rotate around the inner shell. Recesses in the inner shell carry lubricant for lubricating the rotation thereof.

Abstract: An extended nip press for a paper machine for removing water from a wet fibrous or porous web. The press comprises two parallel, rotating press rolls which are pressed against each other and form therebetween a press nip through which a web to be dried passes together with at least one drier felt. At least one of the press rolls is provided with a hard support cylinder and a flexibly compressible shell layer surrounding said cylinder so that the press nip forms an extended press zone. In order to equalize the pressure and the temperature in the press zone, the shell layer is provided with a flexible layer formed by at least one liquid-filled cavity and a gas-filled cell disposed in the cavity, said flexible layer surrounding the support cylinder at least corresponding to the width of the web.

Abstract: A band press for a fiber web contains a cylinder having a solid surface over which there is guided the fiber web, for instance a paper web, which experiences a pressing or squeezing action in conjunction with a felt or wire and a press band which is impervious for a pressurized fluid medium. To accomplish the pressing or contact action there is provided a press housing containing a plurality of pressure chambers or spaces for pressurized fluid medium and with such pressure chambers operating at different pressures. The paper web is guided in a manner such that it bears upon the surface of the cylinder. The press housing is provided at the location where there outbound or depart the bands with a sharp departure or runnoff edge by means of which the bands are separated from the paper web which continues to remain at the cylinder.

Abstract: An extended nip shoe for a press section in a papermaking machine distributes a compressive force to an inrunning compliant transport system advancing a web of paper. The shoe introduces and maintains a film of lubricant throughout the extended nip shoe-compliant transport system interface. Similarly, release of the compressive force is gradual to eliminate points of high unit loads on the compliant transport system and paper web.

Abstract: An extended nip shoe for a press section in a papermaking machine distributes a compressive force to an inrunning compliant transport system advancing a web of paper. The shoe introduces and maintains a film of lubricant throughout the extended nip shoe-compliant transport system interface. Similarly, release of the compressive force is gradual to eliminate points of high unit loads on the compliant transport system and paper web.

Abstract: An extended nip shoe for a press section in a papermaking machine distributes a compressive force to an inrunning compliant transport system advancing a web of paper. The shoe introduces and maintains a film of lubricant throughout the extended nip shoe-compliant transport system interface. Similarly, release of the compressive force is gradual to eliminate points of high unit loads on the compliant transport system and paper web.

Abstract: A press section for extracting water from a continuous traveling web in which the web is sandwiched between a traveling belt and a drum. The belt is wrapped partially about the drum and a pressure shoe exerts pressure on the belt in the wrap area to press the web. The laterally outer ends of the drum are relieved to provide a reduced diameter portion in the areas extending laterally outwardly of the pressure shoe.

Abstract: A non-laminated paper sheet product characterized by regions or islands of increased thickness, usually located in the center of the sheet for more economical use of the paper product and for conservation of wood pulp. The regions of increased thickness are formed by depositing or laying additional pulp stock onto a generally uniform thickness paper web in the web-forming area of a paper machine in either wet or dry methods of paper production. Continuous regions of increased thickness in the web can be formed by corresponding variations in the width of the web or by spraying the additional pulp onto the forming web. Islands of increased web thickness can be formed by periodically interrupting pulp stock depositing sprayheads disposed at spaced locations across the width of the forming web, with timing devices or web thickness sensors controlling the sprayheads.

Abstract: A press section of extracting water from a continuous traveling web such as paper in which the web is sandwiched between a traveling belt and a drum. The belt is wrapped partially about the drum and a pressure shoe exerts pressure on the belt in the wrap area to press the web. The belt includes a reinforcing structure for resisting longitudinal tension and a special transverse stiffening member including two layers of wire cords extending transversely with respect to the belt.

Abstract: A press section for extracting water from a continuous traveling web in which the web is sandwiched between a traveling belt and a drum. The belt is wrapped partially about the drum and a pressure shoe exerts pressure on the belt in the wrap area to press the web. The belt includes a reinforcing structure extending circumferentially thereof and disposed locally within the shoe area of the press section.

Abstract: A press section for extracting water from a continuous traveling web such as paper in which the web is sandwiched between a traveling belt and a drum. The belt is wrapped partially about the drum and a pressure shoe exerts pressure on the belt in the wrap area to press the web. The belt includes a reinforcing structure having two plies of cords extending in cross bias layers with one ply extending laterally beyond one side of the shoe area and the other ply extending laterally beyond the other side of the shoe area.The foregoing abstract is not to be taken as limiting the invention of this application, and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to the accompanying drawings and the following detailed description.

Abstract: An improvement in the method and apparatus for fabricating asbestos-cement boards, wherein a felt band coated with fiber fleece is fed to a pair of press rollers in nip relationship and wherein the coating of the felt band with fiber fleece is effected by wet deposition on the felt band and by suction from the side opposite same.The fiber fleece obtained by wet deposition on the felt band following the deposition is condensed and dehydrated by a system consisting of a sieve cylinder and of an associated suction roller operating in nip relationship.

Abstract: A method for compacting a nonwoven fabric impregnated with a thermoplastic binder at a temperature higher than the softening temperature of the binder to improve hand and drape of the fabric. A bar compresses a relatively thick endless elastomeric belt against a steam heated drum so that a nip is formed therebetween. The nonwoven fabric is passed through the nip between the belt and the drum and thence onto the drum. The nonwoven fabric adheres frictionally to a stretched surface of the belt as it goes through the nip and is thereafter compacted by the belt as the belt unstretches onto the drum. Fibers of the fabric are crowded together, rearranged and crimped locally (all between the faces of the fabric) and more of the fibers of the fabric are caused to be oriented crosswise. To allow compacting at sufficiently high temperatures (160.degree. - 280.degree. F.

Abstract: Lubrication of a compacting resilient belt used in a web compacting system is facilitated by maintaining a constant depth pool of lubricating liquid between a fluid compactor bar and the inside surface of the belt on the belt approach side of the compactor bar. The compactor bar includes a liquid dam sidewall portion that is provided with liquid overflow weir openings so that the level of the surface of the pool can be automatically maintained at a predetermined height. The belt is used in conjunction with a drum to form a nip space between the outside surface of the belt and a peripheral sector of the drum, the nip space receiving the web to be compacted in the web running direction in a conventional manner, the outside surface of the belt being compressed against the drum by the compactor bar, which bears against the inside surface of the belt while the belt is driven through the nip space.

Abstract: An elongated web of paper is treated to render it especially suitable for being gathered transversely and wrapped to make cigarette filters. The treatment includes passing the web through the bight between a pair of rotating rolls provided with intermeshing ribs that do not contact one another and which are arranged generally in planes parallel to their axis of rotation so that the paper is stretched longitudinally in successive transverse areas whereby the paper fibers are loosened and exposed in such areas without complete destruction of the longitudinal continuity of the web.