Metso Paper Inc.

Valmet Corporation

Valmet Paper Machinery Inc.

Valmet Oy

Valmet-karlstad Ab

Valmet Technologies Oy

Jorma Snellman

Antti Poikolainen

Ari Puurtinen

Kari Holopainen

Pekka Kivioja

Erik Brox

Lars O Gustavsson

Juha Isomets&auml;

Tuomo Kurkela

Eero Savolainen

Juhani Niskanen

Samppa J Salminen

Antti I Ilmarinen

Jori Onnela

Ari Lehto

Auvo Saari

Aki Mikkola

Esa Vilmusenaho

Mauri Rukaj&auml;rvi

Matti Ahokas

Jonas Eriksson

Jouni Pakkanen

Juha Mikko Kivimaa

Tuuli Silomaa

Christer Malmros

Malin Kilian

Eero Kalapudas

Mika L&auml;ms&auml;

Antti Tavi

Markku Arvonen

Anssi Miettinen

Ville Eronen

A roll for a paper or board machine is produced by forming a tubular roll blank by bending out of a planar sheet or by means of centrifugal casting. The roll blank is first coated with a material having a modulus of elasticity and a density lower than those of steel and the coated roll blank is turned on a lathe to a desired shape and to a desired surface quality.

Roll of a paper/boardmaking machine

The present invention relates to an end packing ( ) for a deflection compensated roll. The roll including a stationary shaft ( ) and a roll shell ( ), bearing-mounted rotatably therearound and having each end thereof provided with a shaft-enclosing annular end cap ( ). The end cap ( ) has its surface internal in the axial direction of the roll or its surface external in the axial direction formed with a sealing surface ( ). The end packing elements ( ) are provided with an annular packing member ( ) extending around the shaft ( ) and including a front face, which is directed towards said sealing surface ( ) and which is in contact with the sealing surface ( ) or separated from the sealing surface ( ) by a gap constituting an axially directed narrow slot. The packing member ( ) is provided with elements connected to a supply of compressed air for delivering compressed air into a cavity ( ) between the packing member and the sealing surface, whereby the compressed air striving to flow between the packing member's front face and the sealing surface into and out of the roll functions as a seal.

End packing for a deflection compensated roll

The invention relates to a slide shoe assembly for a roll ( ) in a paper/board machine or a finishing machine, said roll ( ) comprising a stationary axle ( ), around which is rotatably mounted a cylindrical roll shell ( ), a clearance ( ) formed between the axle ( ) and an inner surface ( ) oF the roll shell ( ) being fitted with loading elements ( ) operated by a pressurized hydraulic fluid and provided with slide shoes ( ) which are loadable against the inner surface ( ) of the roll shell ( ) for controlling the distribution of a nip pressure in a nip (N) established with a counter roll ( ). According to the invention, the loading element is equipped with means capable of eliminating or compensating for a nip-load induced deflection of the roll shell and/or a deflection of the slide shoe caused by the pressure of a hydraulic medium, thereby eliminating the harmful effects caused by said deflections on an oil film between the loading shoe and a cylindrical surface supported thereby.

Slide shoe assembly for a roll in a paper/board machine of a finishing machine

Method for producing a roll for a paper/boardmaking machine

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.

Suction box in a paper machine

A roll has a continuous tubular roll shell ( ) of a composite material and axle journals ( ) rotating together with the roll shell and joined to each end of the roll shell. The axle journals are supported on a supporting element ( ) surrounding the axle journal ( ) by at least two bearing elements ( ) located at a distance from each other in the axial direction (X&mdash;X) of the roll, which supporting element ( ) for its part is supported on the machine frame structures (R). The first bearing element ( ) is supported on the supporting element ( ) through a bending mechanism ( ), which is used for applying to the first bearing element ( ) a force affecting in a radial direction in order to deflect the first bearing element ( ) in relation to the central axis (X&mdash;X) of the unbent roll, whereby the axle journal ( ) will bend in relation to a pivot point which is formed at the second bearing element ( ) and a bending moment is applied to the roll shell ( ).

Roll that can be bent with a composite shell

A roll that can be bent for a web-like material, which roll comprises a continuous tubular roll mantle ( ) of composite material as well as axle journals ( ) connected to each end of the roll mantle ( ). The axle journals ( ) are attached by means of at least one mechanism ( ), by whose means the axle journals ( ) and thereby the roll mantle ( ) are bent into an arc form, and a regulation device ( ) by whose means the angular position of the roll arc can be regulated.

Roll that can be bent for a web-like material

The invention concerns a seal construction for a suction roll in a paper machine. The seal construction ( ) comprises a substantially U-section holder ( ) open towards the inner face ( ) of the roll mantle, a seal which is mounted in the holder, which is placed in the axial direction of the roll, and which consists of a frame part ( ) of the seal fitted in the holder ( ) and of a wear part ( ), which is fix to the frame part and which is placed against the inner face ( ) of the roll mantle, and which seal construction also comprises loading means, such as a loading hose ( ) or equivalent, by whose means the seal can be shifted in the holder ( ) against the inner face ( ) of the roll mantle. According to the invention, in the interior of the frame part ( ) of the seal, an inner loading member ( ) has been arranged, by whose means the frame part of the seal can be locked in contact with the holder ( ) so as to position the wear part ( ) of the seal in the desired position in relation to the inner face ( ) of the roll mantle.

Seal construction for a suction box in a suction roll in a paper/board machine

An extended-nip press device comprises a press shoe extending in a cross-machine direction and a support for supporting the press shoe. Between the shoe and the support are arranged a plurality of loading cylinders for moving the shoe toward a backing member such as a counter roll to apply pressure to a fibrous web passing through the nip between the shoe and counter roll. Each loading cylinder comprises a first cylinder member fixed on the shoe and a second cylinder member fixed on the support, and a connecting member that slidably engages both cylinder members. The connecting member can slide relative to the first cylinder member with a first stroke length L that is smaller than the stroke length L between the connecting member and the second cylinder member. Accordingly, the connecting member can remain essentially aligned along the lengthening direction of the loading cylinder.

Press device having an extended press nip for pressing a traveling paper or paperboard web

A method and apparatus is disclosed for balancing a cylinder, roll, or equivalent part, with a thin mantle, by which deviations in the circumferential deflection line of the mantle can be compensated in order to correct for dynamic runout. Errors in the circumferential deflection line are measured and dynamic runout is determined. Locations and magnitudes of any counterweights necessary for balancing are determined based on deformations and dynamic runout arising from deviations in the deflection line of the mantle. Counterweights are fixed to the inner face of the mantle of the cylinder, roll or equivalent part at positions determined from measurements.

Method for balancing a cylinder, roll or equivalent part with a thin mantle and balanced cylinder, roll or equivalent part with a thin mantle

A shoe press unit comprises a support beam, a shoe element movably supported on the beam, a pressing unit arranged between the beam and the shoe element for urging the shoe element away from the beam and toward a counter element, and a flexible belt that is arranged to slide over the pressing surface of the shoe element. An oil evacuation arrangement formed separately from the shoe element is affixed to the shoe element proximate an upstream edge region thereof. The oil evacuation arrangement has an inlet opening located such that a major portion of the excess oil expelled from between the belt and the shoe element passes through the inlet opening with a kinetic energy that is substantially undiminished from the initial kinetic energy of the oil as it exits from between the belt and the pressing surface of the shoe element.

Method and device for oil evacuation from a shoe press unit

A 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. A method in a suction box in a paper machine, wherein a vacuum is formed in a vacuum chamber of the suction box and, during formation of the vacuum, the deck and/or the ribs is/are pressed against the wire. At least in a running situation, the curve form of the deck of the suction box or the position of the ribs is such that the tension of the wire running over the deck or ribs lowers the normal force which is produced by the vacuum present in the suction box and which is effective between the wire and the deck/ribs.

Suction box in paper machine and method in the suction box in a paper machine

The invention relates to a lighter bearing assembly, in which the bearing includes an outer sleeve and an inner sleeve that rotate in relation to each other, the outer sleeve being set in a bearing block and the inner sleeve being set on a shaft, and one of the sleeves being arranged for axial movement relative to its support surface, and a pocket being arranged in the movement surface thus formed, to which a lubrication channel extends, to facilitate axial movement, such as that due to thermal expansion, the pocket being formed by a sealed area that delimits part of the movement surface.

Lighter bearing assembly

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. The piston engages the cylinders at seals which enable the piston to pivot with respect to both cylinders about axes parallel to and perpendicular to the machine direction so as to enable the loading cylinders to accommodate deformations and thermal expansion of the shoe in the cross-machine direction and to allow the shoe to pivot about an axis perpendicular to the machine direction.

Shoe press

Growing community of inventors

Jyväskylä, Finland

Jorma Snellman