Abstract: Deflection controlled roll that includes a rotating roll jacket, a rotationally fixed yoke arranged to axially pass through the roll jacket, and a plurality of hydrostatic support elements arranged in series on the yoke in the direction of a roll axis which are chargeable with a pressure fluid to exert a supporting force on an inner side of the roll jacket. The plurality of hydrostatic support elements include hydrostatic pockets and at least one restrictor or capillary structured and arranged to supply pressure fluid to each of the hydrostatic pockets. A volume flow of at least some of the pressure fluid supplied to a respective hydrostatic pocket is variable depending upon a pressure on its respective hydrostatic support element.

Abstract: Deflection controlled roll that includes a rotating roll jacket, a rotationally fixed yoke arranged to axially pass through the roll jacket, and a plurality of hydrostatic support elements arranged on the yoke in a direction of a roll axis which are chargeable with a pressure fluid to exert a supporting force on an inner side of the roll jacket. A device for influencing a roll temperature via at least one fluid flow, which is separate from the pressure fluid is also included. The support elements are arranged into a plurality of controllable roll zones arranged along the roll axis. The temperature influencing device is structured and arranged to locally charge respective roll zones depending upon a pressure on the support elements in a respective roll zone.

Abstract: Deflection compensation roll and process for reducing vibrations in deflection roll. The roll includes antifriction bearings, a roll jacket supported in an area of its axial ends on the antifriction bearings, and hydraulic supports arranged to hydraulically support the roll jacket parallel to a working plane. A damping device, positioned next to each antifriction bearing, is structured and arranged to act essentially perpendicular to the working plane.

Abstract: An apparatus for displacing the roll mantle end pieces of shoe press, said shoe press comprising a press roll (1) and a backing roll, said press roll (1) comprising a rotating, liquid-impermeable roll mantle (2), a solid and preferably non-rotatable support beam (3) going axially through the roll mantle and having a stub shaft (4, 5) at each end of it, at least one press shoe supported by the support beam and having a concave surface part, elements for pressing the concave surface part against the roll mantle so that the mantle together with the backing roll can form a pressing zone, two roll mantle end pieces (6, 7) axially movable on each stub shaft, fastening elements for fastening the axial ends of the roll mantle to each roll mantle end piece. The apparatus comprises a multi-chamber cylinder unit (8) functionally connected to both roll mantle end pieces, said cylinder unit being disposed inside the support beam (3) and used to move both roll mantle end pieces (6, 7).

Abstract: A calender arrangement includes end rolls that are in the form of deflection controlled rolls having an internal stroke. One of the end rolls comprises at least one stop element that is in the form of a hydraulic positioned hydrostatic element which, together with the internal wall of the roll sleeve, defines a gap. When a constant throughput of hydraulic medium is fed in, an equilibrium of forces is produced, at which equilibrium the roll sleeve is positioned. The pressure built up in the process is a measure of the positioning forces. Small departures from the target position are permitted without control intervention.

Abstract: For a roller mounted on roller bearings in a roller stand, a hydrostatic support element is provided directly next to the roller bearing. The support element applies an additional force sufficient to assure proper rolling movement of the roller bearing bodies of the roller bearing when there is insufficient weight on the roller bearing to assure proper rolling movement. Alternatively, when great force is applied to the roller, the support element can alleviate the force applied to the roller bearing.

Abstract: In a process and apparatus for producing long plastic sheets by pressing molten plastic materials between the forming roller and the forming drum unit, the forming drum unit including a thin cylindrical sleeve supported from inside by a drum support unit and pressed against the outer surface of the forming roller to deform elastically in a curve along the outer surface of the forming roller as it rotates, thus maintaining a relatively long contact length.

Abstract: A method and arrangement is disclosed for removing oil from a roll, in which, inside a rotatable shell, there is a fixed axle beam, which supports loading shoes directed against the inner surface of the shell. An oil guide attached to the loading shoes creates an inwardly-directed jet of oil, next to and at a short distance from which a collector trough is located. The oil guide and an auxiliary guide attached to the collector trough guide and channel the oil jet against the collector trough. The oil is removed to an outlet pipe through a low gap in the bottom of the collector trough.

Abstract: The roll comprises a stationary support construction (11) and a roll mantle (12) revolving around the construction, which mantle is supported from its inner face (12′) on the support construction (11) by at least one hydraulically loaded loading member (13), by which the roll mantle (12) is loaded against a backup roll (20) which forms a nip (N) with the roll. The oil removing arrangement comprises an oil collecting equipment (90) fitted in the space between the outer face (11″) of the support construction (11) and the inner face (12′) of the roll mantle (12), in which oil collecting equipment there is an oil guide plate (91) which is supported at least on the support construction (11), which is arc-shaped in the direction of the circumference and which forms a first oil guide face. At the lateral edges of the oil guide plate (91), there are radial side walls (93,94) directed towards the support construction, and at the curved rear edge there is a curved rear wall (92).

Abstract: A calender arrangement includes end rolls that are in the form of deflection controlled rolls having an internal stroke. One of the end rolls comprises at least one stop element that is in the form of a hydraulic positioned hydrostatic element which, together with the internal wall of the roll sleeve, defines a gap. When a constant throughput of hydraulic medium is fed in, an equilibrium of forces is produced, at which equilibrium the roll sleeve is positioned. The pressure built up in the process is a measure of the positioning forces. Small departures from the target position are permitted without control intervention.

Abstract: Sag (deflection) compensation roll and process for operating sag compensation roll. The sag compensation roll includes a rotatable roll jacket, a non-rotating carrier being located inside the roll jacket, and a hydraulic support element arrangement being located between the carrier and the roll jacket. A bearing ring is located at each end of the roll jacket, the bearing rings are movable relative to the carrier in a press plane, and a bearing arrangement is located between the bearing rings and the roll jacket. The bearing arrangement includes at least three support elements distributed in a circumferential direction. At least one of the at least three support elements is movable with respect to the bearing ring. The process includes supplying the bearing pockets with a constant volume flow of hydraulic fluid, and driving at least one support element into the bearing ring under load up to the fixed position.

Abstract: Press roll, system and method for the treatment of a fibrous material web. The press roll forms at least one nip with a respective mating surface and comprises a non-rotatably mounted carrier, a press sleeve surrounding the carrier, and at least one outer support device disposed between the carrier and the press sleeve, the press sleeve being supported against the carrier at a respective press nip. The press roll additionally comprises a sagging control system to control the sagging of the carrier. The system additionally provides first and second mating rolls that form respective first and second nips with the press roll. A method of treating a material web comprises guiding the web along a felt through the press roll and mating rolls.

Abstract: When rolling steel sheet and other rolled stock, rattling occurs in certain operating states. This results in reduced quality of the rolled stock and rejects as well as damage to the rolling mill. No improvement was achieved by placing brakes on the cylinders. Electronic monitoring is not a satisfying solution. Given that rattling is a self-starting oscillation, resistance sensors are coupled to the cylinders and/or the rolled stock in order to stabilize the self-starting oscillation modes, modes with negative damping, by means of additional damping. In the example illustrated in FIG. 4, cylinder-shaped, rotating dampers are coupled to the working cylinders. Concentric or disc-shaped layers made of steel and plastic such as those found in layered oscillation absorbers are most effective and adaptable. The arrangement of the working cylinder and the damper illustrated in FIG.

Abstract: Deflection controlled roll that includes a rotatable roll jacket, a rotationally fixed carrier arranged within the roll jacket, and a hydraulic support element arrangement positioned between the carrier and the roll jacket. A closed bearing ring is located in an end region of the roll jacket and is movable relative to the carrier in a press plane, and a bearing arrangement is positioned between the bearing ring and the roll jacket. The bearing arrangement includes at least two hydrostatic support elements which are mutually spaced in a peripheral direction and at least one of the at least two hydrostatic support elements is movable relative to the carrier. At least one force generating device is positioned between the carrier and the roll jacket and is arranged to act generally radially in the press plane.

Abstract: A system for controlling vibration of a dynamic surface includes at least one sensor in communication with the dynamic surface for measuring vibration of the dynamic surface and generating a feedback signal proportional to the measured vibration and at least one piezoelectric actuator in communication with the dynamic surface and in communication with the controller for receiving the output signal. The system also includes at least one mass overlying the at least one piezoelectric actuator, whereby the at least one piezoelectric actuator lies between the mass and the dynamic surface, and a controller in communication with the at least one sensor for receiving the feedback signal, generating an output signal in response to the feedback signal and sending the output signal to the at least one piezoelectric actuator. The piezoelectric actuator applies a counter force between the dynamic surface and the mass upon receiving the output signal for reducing or controlling vibration of the dynamic surface.

Abstract: A tubular roll with glide bearings and a method for providing a tubular roll mantle with glide bearings. The roll mantle is supported on a roll axle by hydraulic glide bearing elements which are loaded hydraulically by a pressure medium. The roll is loaded from outside radially in a principal loading direction and the roll mantle is supported on the roll axle by glide bearing elements in the principal loading direction. The loading pressure and lubricant are fed to the glide bearing elements as separated from one another so that the movement of the roll mantle, the speed of movement and the change in speed are regulated by opening, closing and/or throttling the flow in the pressure duct of the loading pressure. The lubricant may be fed to the glide bearing elements irrespective of the loading pressure.

Abstract: A cylinder device includes a deflection-controllable cylinder having a rotating hollow cylinder which is longitudinally traversed by a crosshead. Crosshead sags when subjected to a load. The ends of the crosshead, which protrude from the hollow cylinder, are supported by bearings in the cylinder housing that include flat slide surfaces which interact, are hydraulically relieved of load, and absorb the elongation of the crosshead. Also, where applicable, spherical surfaces which interact, are hydraulically relieved of load, and absorb the deflection of the crosshead.

Abstract: The roll comprises a stationary support construction (11) and a roll mantle (12) revolving around said construction, which mantle is supported from its inner face (12′) on the support construction (11) by means of at least one hydraulically loaded loading member (13), by whose means the roll mantle (12) is loaded against a backup roll (20) which forms a nip (N) with the roll. The oil removing arrangement comprises an oil collecting equipment (90) fitted in the space between the outer face (11″) of the support construction (11) and the inner face (12′) of the roll mantle (12), in which oil collecting equipment there is an oil guide plate (91) which is supported at least on the support construction (11), which is arc-shaped in the direction of the circumference and which forms a first oil guide face. At the lateral edges of the oil guide plate (91), there are radial side walls (93,94) directed towards the support construction, and at the curved rear edge there is a curved rear wall (92).

Abstract: A method of controlling vibration of a dynamic surface includes providing at least one piezoelectric actuator in communication with the dynamic surface, and providing a mass over the at least one piezoelectric actuator so that the at least one piezoelectric actuator lies between the mass and the dynamic surface. The method includes sensing vibration of the dynamic surface, and activating the at least one piezoelectric actuator after sensing vibration of the dynamic surface for applying a counter force between the dynamic surface and the mass for reducing or controlling vibration of the dynamic surface.

Abstract: A method of controlling deflection of a dynamic surface having a predetermined shape includes sensing a change in the predetermined shape of the dynamic surface, providing at least one piezoelectric actuator in communication with the dynamic surface for applying a counter force thereto, and activating the at least one piezoelectric actuator for applying the counter force to the dynamic surface for returning the dynamic surface to the predetermined shape.

Abstract: A method of controlling deflection of a dynamic surface having a predetermined shape includes sensing a change in the predetermined shape of the dynamic surface, providing at least one piezoelectric actuator in communication with the dynamic surface for applying a counter force thereto, and activating the at least one piezoelectric actuator for applying the counter force to the dynamic surface for returning the dynamic surface to the predetermined shape.

Abstract: Deflection compensating roll and method of use thereof. The deflection compensating roll comprises a carrier that is nonrotatably held by an outer bearing and is disposed within a roll shell. The invention also includes a plurality of hydrostatic support devices arranged about the outer surface of the carrier and support the roll shell. Also included is a hydraulic piston/cylinder unit having an actuating element, the outer bearing supported on the actuating element, the actuating element forcing the outer bearing toward a mating roll. A bearing surface intermediate the outer bearing and the actuating element is present, and at least one pocket located opposite the bearing surface and having a surrounding rim is also present. The pocket is connected by a restrictor to a pocket pressurized fluid source, and a gap is present intermediate the bearing surface and the rim, the pocket being further connected by a gap to an outlet.

Abstract: An arrangement of equipment in connection with a variable crown roll provided with loading shoes to prevent foaming of fluid. The arrangement includes a separate guide and a face that guides the fluid in order to guide the fluid smoothly away from the inner face of the roll mantle of the roll and into a collecting trough.

Abstract: In the present invention, in a process in which a fiber suspension supplied in a flat layer manner is subjected to natural dehydration, pressure dehydration, or suction dehydration, while circulating a cylindrical suction cylinder, and thereby, dehydration slowly proceeds and a paper web is formed, and this paper web is moved to an endless felt by means of a suction couch roll to produce paper, a tapered suction roll sleeve 6, the outer peripheral surface of which is cylindrical and the inner peripheral surface of which has an inclination identical to that of the outer circumference of the tapered suction roll cell 5 is attached and detached, and thereby, it becomes easy to conduct the attachment and detachment of various types of wires wound on tapered suction roll sleeve 6.

Abstract: Deflection compensation roll with a jacket lift. The deflection compensation roll includes a carrier that is fixed against rotation, a support device coupled to the carrier, a jacket rotatably mounted on the support device, and a radial seal and an axial seal positioned between the jacket and the carrier. A ring groove is coupled to one of the jacket and the carrier, a ring body is arranged for axial movement in the ring groove. The ring body includes a face adjacent to an atmosphere outside of the jacket and a circumference. A cylindrical sealing surface is coupled to the other of the jacket and the carrier. An axial sealing lip is located on the face adjacent to the atmosphere to contact a side wall of the ring groove, and a radial sealing lip is located on the circumference to contact, and to rotate relative to, the cylindrical sealing surface.

Abstract: A roll, in particular a variable-crown roll, including a frame beam, an axle journal arranged at each end of the frame beam and a revolving roll mantle mounted by bearings on support of the axle journals. A glide shoe is arranged on the frame beam to act on the roll mantle in order to produce a loading pressure in a nip defined between the roll and a back-up roll. A hose filled with fluid is situated between the glide shoe and the frame beam in order to equalize the loading pressure transferred through the glide shoe in the longitudinal direction of the roll.

Abstract: A calender which includes a deflection-controlled roller with a rotating hollow cylinder and a non-rotating cross-head. Hydrostatic supporting elements on the cross-head can be radially displaced towards the inside circumference of the hollow cylinder, and have hydrostatic bearing pockets in their contact surfaces. The position of supporting elements are controlled using a cylinder space with a small cross-section. When there is a problem with the web, the cylinder spaces can all be hydraulically relieved, eliminating the contact pressure and therefore the exertion of force by the supporting elements.

Abstract: Method and arrangement for automatic monitoring and correction of the regulation pressure of regulation valves in a regulation valve block in a variable-crown roll in a paper machine. The regulation pressure of the regulation valve in each regulation zone in the regulation valve block can be connected alternatingly to a reference pressure detector whose measurement signal is compared with the measurement signal of the actual value of the regulation pressure in the regulation zone concerned. The result of the comparison is stored on the page of monitoring of pressure detectors contained in the central computer system, on which page, in addition to this difference, set values and actual values of the regulation zone pressures as well as the value of the reference measurement are provided.

Abstract: A method of supporting a press shoe in a shoe press for a paper or board machine, said press shoe forming together with a counter roll an extended nip for a paper or cardboard web and for a flexible circulated belt. On the outside of the loading cylinder of the press shoe there is arranged a compartment, to which hydraulic fluid is supplied in such a manner that the hydraulic fluid in the compartment directly or indirectly exerts a force upon the press shoe in the direction opposite to that of the force exerted upon the press shoe by the loading cylinder. The cylinder part of the loading cylinder is movably arranged on the piston part. Said forces are dimensioned such that in operation they create a gap between the press shoe and the loading cylinder, or between the supporting beam of the press shoe and the loading cylinder, thereby allowing hydraulic fluid to flow out of the compartment.

Abstract: A shoe press for applying pressure to a moving web of paper or the like includes a press shoe extending along a full width of the web being carried through a nip defined between the shoe and a backing member, a support for the shoe, and a plurality of articulated hydraulic loading cylinders arranged between the support and the shoe for urging the shoe toward the backing member to apply pressure to the web. Each loading cylinder includes a single piston and first and second cylinders attached to the shoe and to the support, respectively. The opposite end portions of the piston are slidably received within the cylinders so as to define working chambers in the cylinders which are pressurizable by hydraulic fluid for urging the two cylinders away from each other.

Abstract: In a process and apparatus for producing long plastic sheets by pressing molten plastic materials between the forming roller and the forming drum unit, the forming drum unit comprising a thin cylindrical sleeve supported from inside by a drum support unit and pressed against the outer surface of the forming roller to deform elastically in a curve along the outer surface of the forming roller as it rotates, thus maintaining a relatively long contact length.

Abstract: Roll machine and process for forming a roll machine. The roll machine includes a roll having a roll body and an elastic layer located on a periphery of the roll body, and a mating roll. At least one roll nip is formed between the roll and the mating roll, and the elastic layer has a radial thickness less than approximately 8 mm. The process includes covering the roll body with an elastic layer having a radial thickness less than approximately 8 mm and pressing the roll and the mating roll together to form a press nip.

Abstract: A roller is provided for a pressure treatment of a web of paper, textile, plastic film, and is composed of a rotary hollow cylinder which can be distinctly deformed under the effect of line forces in the roll nip. The roller includes a non-rotary cross-head which penetrates the rotary hollow cylinder over its length. On the side of the roll nip, hydraulic supporting elements are provided which can be pressed against the inside circumference of the hollow cylinder in the manner of piston/cylinder units. These supporting elements have a length of not more than 20 cm in the longitudinal direction of the cross-head, and are closely arranged next to one another in the longitudinal direction of the cross-head. The supporting elements can be driven independently of one another at least in several groups. A sealing strip is also provided which continues in one piece over several supporting elements.

Abstract: A shoe press for a paper or board machine comprises a press shoe and a counter roll forming an extended nip for a paper or cardboard web and for a circulated flexible belt. At least one hydraulic loading cylinder is arranged between a horizontal supporting beam included in the frame system of the shoe press and the counter roll for pressing the press shoe against the counter roll, the piston of the loading cylinder being fixed to the supporting beam. A hydrostatic compartment is arranged between the surface of the press shoe facing the loading cylinder and the opposing surface of the loading cylinder and adapted to be supplied with hydraulic fluid from a hydraulic fluid source, the hydraulic fluid chamber communicating with the working chamber of the loading cylinder. A duct formed in the press shoe, or in a pipe attached to the press shoe, opens into the hydrostatic compartment and is connectible to the hydraulic fluid source.

Abstract: A shoe press for a paper or board machine, comprising a press shoe and a counter roll which between themselves form an extended nip for a paper or cardboard web and a circulated flexible belt, and at least one loading cylinder which is arranged between a supporting beam included in the frame system of the shoe press and the press shoe and adapted to press the press shoe against the counter roll. The press shoe is arranged on top of the loading cylinder and there is a device for releasably securing the loading cylinder on the supporting beam. With the aid of eccentric means arranged on upstream and downstream sides of the loading cylinder or cylinders, each loading cylinder is positionable in multiple locations in the machine direction for regulating the pressure profile of the shoe press.

Abstract: A controlled deflection roll has a roll shell which is hydrostatically radially supported by internally disposed hydrostatic shoes. In order to axially position the roll shell, a mechanical locating link is provided which is disposed externally of the roll shell. The link is coupled at one end to an element attached to the roll shell, and is coupled at an opposite end to a fixed support, such as a floor stand. The end of the roll at which the locating link is disposed is thus axially fixed, while the opposite end of the roll remains free to float. The locating link can be connected to an oscillator to oscillate the roll shell axially during operation so as to distribute any non-uniformities in the roll shell and thus to mitigate their effect on the sheet.

Abstract: A method and apparatus for controlling a deflection roll for compressing a web of material includes a shaft and a hollow roll disposed around the shaft. The hollow roll includes a working surface where the hollow roll is engageable with a hard roll along an entire length of the working surface. At least two bearing devices are disposed within the roll and are substantially aligned with the working surface of said roll. Each bearing device has a predetermined positive bearing clearance facilitating displacement of each outer contact surface relative to a respective inner contact surface of each bearing. The deflection roll further includes a mechanism for displacing the working surface of the roll with a fluid where the displacing mechanism is disposed external to the bearing devices.

Abstract: An adjustable deflection roll including a roll sleeve or jacket supported by a plurality of support devices positioned partially within a support beam. Pressure chambers may be located between the support devices and the support beam and each pressure chamber may be coupled to a supply line. As the length of the roll increases, and as the need for increasingly more precise pressure distributions also increases, more support devices may be utilized. The adjustable deflection roll may also include a drain channel to facilitate quick relief of the pressure chambers when necessary. To accomplish this, each pressure chamber may be coupled to the drain channel furnished with the supply line such that the drain channel may be closed with a drain valve.

Abstract: A roller assembly includes a rotating hollow roller and a non-rotatable crosshead longitudinally traversing the hollow roller. The hollow roller is supported by supporting elements acting against the inner circumference of the hollow roller. Each supporting element has a hydrostatic bearing pocket, whose extension in the longitudinal direction of the roller is at least three times that in its circumferential direction. This prevents the hollow roller from deforming and prevents edge pressure from being exerted on the web surrounding the bearing pocket.

Abstract: A shaft roller, including a shaft, a casing with two ends, and further, for each of the two ends of the casing, a bearing support, an end bearing, and a protective cap. The roller further includes a plurality of inner tubes, a plurality of ring holders, and a plurality of inner bearings. For each end of the casing, a groove is cut into the inner periphery of the casing for holding a peripheral outward extension of the bearing support. For each end of the casing, the bearing support has a wheel body with spokes, surrounding the end bearing and holding the end bearing with an inward projection. The end bearing is a needle roller bearing around the shaft, having a needle cage with a plurality of needles. For each end of the casing, the protective cap prevents dust and humidity from entering the casing, being attached to the bearing support by a plurality of blocks.

Abstract: Flexible press sleeve for a press roll for treating a web includes an inside surface including a longitudinal press area adapted to be pressurized with a press shoe by directing pressure radially outward, and a flexible section on at least one end of the press area having a greater flexibility than a flexibility of the press sleeve outside the flexible section, without causing a significant weakening of the press sleeve within the flexible section. A press shoe includes the press roll and a mating roll forming a press opening with the press roll. A method of treating a web includes draining a fibrous pulp web by using the press shoe.

Abstract: A controlled deflection roll for a papermaking machine. The roll includes a roll shaft having a longitudinal axis, a roll shell surrounding the shaft, and a bearing pad assembly supported on the shaft to supportingly engage the shell and move the shell translationally relative to the shaft in a plane including the axis. In one embodiment, the bearing pad assembly includes a plurality of bearing pads. Each bearing pad is spaced apart in the cross-machine direction and has a contact surface engageable with the inner surface of the shell. The contact surface is in the shape of a parallelogram and defines therein at least one recess. The side edges of adjacent bearing pads are straight and parallel to each other and define gaps therebetween. The gaps do not extend along a plane which is perpendicular to the axis. In another embodiment, the bearing pad assembly includes at least one bearing pad having a contact surface and opposite edges. The contact surface has a contact surface portion engageable with the shell.

Abstract: An adjustable deflection roll is illustrated and described having a rotating roll jacket, a carrier which passes axially through the roll jacket and is rotationally fixedly held at its ends in frames and at least one support element which is arranged on the carrier and exerts a support force on the inner side of the roll jacket in a pressing plane. The roll jacket is rotatably held on a bearing housing secured against rotation in the region of at least one of its axial ends by at least one bearing. The roll is of simple layout and easy to exchange in that the bearing housing is secured against rotation at the carrier at at least one roll end within the roll jacket or within an axial projection of the roll jacket.

Abstract: A roll having bending control has a rotating hollow roll and a non-rotatable crossbeam penetrating the hollow roll lengthwise. Arranged on the crossbeam in an axially parallel row, closely following one another, are supporting elements which can be actuated independently of one another by fluid pressurized medium. Supply lines are attached via angle units to a bar-type carrier which is fastened to the crossbeam by means of screws that can be manipulated from the outside. The screws have longitudinal bore holes through which the respective supply line is directly connected to the respective supporting element.

Abstract: A method for fitting a roll mantle of a tubular roll used in a paper machine or equivalent with glide bearings and a tubular roll. The roll mantle is supported on a stationary roll axle by hydraulic glide bearing elements acting upon the roll mantle and/or upon the roll ends. The bearing elements are loaded hydraulically by the pressure of a first pressure medium. The roll is loaded from outside radially in the direction of at least one plane, i.e. in a so-called principal loading direction. The roll mantle is supported on the roll axle by the glide bearing elements which act radially substantially in the principal loading direction in opposite directions and which are provided with a device for regulating the braking pressure provided by a second pressure medium, so that in the principal loading direction, the roll mantle is allowed to move over a certain distance.

Abstract: A roller with controllable sag is provided with a revolving hollow roller and a non-rotating crosshead that crosses the hollow roller along its length and on which the hollow roller is supported by a series of supporting elements that are actuated by a pressure medium. Separate supply lines (13) lead to the supporting element and open out into a collection head (40) at the end (10') of the crosshead, to which the outer connection lines (53) are connected. The connection head (40) comprises a double-disc rotary slide valve (50) by which the lines (13, 53) can be interrupted and which in the closed state can be separated at a separation surface (47). The individual discs (51, 52) of the double disc rotary slide valve (50) keep both the supply lines (13) and connection lines (53) closed, thus facilitating replacement of the roller as and when required.

Abstract: A variable-crown roll including a stationary roll axle, a tubular roll mantle rotatably mounted by its ends on the roll axle by end bearings and hydraulic loading shoes arranged between the roll mantle and the roll axle. The loading shoes act upon an inner face of the roll mantle in a direction toward a nip defined in part by the roll, are supported on the roll axle and are loaded by a hydraulic pressure medium. The nip pressure is profiled in the axial direction of the roll by regulating the pressure of the pressure medium passed into the loading shoes. The roll mantle is made of a fiber-reinforced composite material so that the stability of shape of the roll mantle in the direction of the circumference is good, i.e., it maintains its shape, and the rigidity in the axial direction is low, i.e., it is profitable.

Abstract: A non-self loading controlled deflection roll for a papermaking machine having a machine direction and a cross-machine direction, the roll including a shaft support member, first and second shell support members, a roll shaft having a longitudinal axis in the cross-machine direction, the shaft having axially spaced first and second ends, a roll shell surrounding the shaft, the shell having axially spaced first and second ends, the shell being rotatable about the shaft, a bearing pad supporting the shell relative to the shaft, the bearing pad being located between the first and second ends of the shell, first and second outboard bearings supporting the shaft relative to the shaft support member adjacent the first and second ends, respectively, first and second spherical bushings supporting the shell relative to the shaft, the first and second spherical bushings being mounted on the shaft axially inwardly of the first and second outboard bearings, respectively, each of the spherical bushings having a first annu

Abstract: An extended nip press apparatus is disclosed for pressing a web. The apparatus includes an elongate press shoe which defines a concave surface. A backing roll cooperates with the concave surface for defining therebetween an extended nip pressing section for pressing the web. A looped bearing blanket slidably cooperates with the concave surface. The blanket is disposed between the shoe and the backing roll for supporting and guiding the web through the pressing section. A piston is pivotally connected to the press shoe, the piston being selectively urged towards the backing roll. The arrangement is such that when the piston is urged towards the backing roll, the piston urges the shoe and the blanket towards the backing roll so that the web disposed between the blanket and the backing roll is pressed. The piston has a first and a second portion, the first portion being disposed between the second portion and the shoe.

Abstract: A roll arrangement is described with a rotatable roll jacket, a fixed carrier and a multi-part support arrangement disposed between the roll jacket and the carrier and consisting of sliding shoes which are movable in the radial direction relative to the roll jacket. In this arrangement neighboring sliding shoes in the axial direction and/or in the circumferential direction of the roll jacket are biased towards one another groupwise in gap-free manner while maintaining relative movability.