Valmet-karlstad Ab

Metso Paper Inc.

Valmet Corporation

Metso Paper Karlstad Ab

Lars O Gustavsson

Erik Brox

Jorma Snellman

Kenth R Tornqvist

Antti I Ilmarinen

Nils-Erik Safman

Roland Bengtsson

Jonas Eriksson

Carl-Gustaf Salomonsson

Juha Mikko Kivimaa

Mattias Alsing

L Stefan Karlsson

Sven-Ove Andersson

Malin Kilian

U Mikael Nyman

Christer Malmros

Bo Ingvar Dahlbom

A press device with an extended press nip for pressing of a continuous paper or paperboard web comprises a press shoe, a backing member, a support, and a plurality of loading cylinders with main axes in their longitudinal directions. The press shoe can be moved between different positions. A stop member is arranged downstream of the press shoe for transfer between and fixation at different stop positions in the machine direction. At least some of the loading cylinders or the support comprise members eccentrically arranged with respect to one or some of the main axes, which members can be brought into different eccentric positions with respect to the main axes. The eccentric position and the stop position controls the position of the press shoe during the pressing, and thereby the pressure curve.

Press device having an extended press nip for pressing of a travelling paperboard web, and procedure for controlling the pressure curve in the machine direction by such press nip

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 is affixed to the shoe element proximate an upstream edge region thereof. The oil evacuation arrangement has an inlet opening located such that excess oil expelled from between the belt and the shoe element passes through the inlet opening. An evacuation duct is connected with the container for evacuating oil therefrom, and the duct is movably connected to an outlet pipe within the shoe press unit. In one embodiment, the duct is connected via a flexible bellows to a pipe fixed to the outlet pipe.

Method and device for oil evacuation from a shoe press unit

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.

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 a plurality of hydraulic loading cylinders which are arranged between a horizontal 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 pistons of the loading cylinders being fixedly connected to the horizontal beam. The working chambers of the loading cylinders are supplied with fluid by a common duct formed in an elongate duct member which is affixed to the beam. A vertical duct is formed in the piston of each loading cylinder and is connected to the common duct. The duct member is releasably affixed to the beam by eccentric clamping members which are fixable in multiple positions on the beam for selectively placing different portions of the clamping members in engagement with grooves formed in opposite sides of the duct member, such that the duct member and loading cylinders can be shifted as a unit in the machine direction of the shoe press.

Shoe press

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.

An elastic clamping ring for an enclosed shoe press roll used to clamp the jacket to the gables of the shoe press roll is disclosed. A rigid clamping ring is arranged on the inner side of each gable to form a groove which opens outwardly in the radial direction and in which the elastic clamping ring is received. A stop member is arranged radially outside the elastic clamping ring. By operation of securing members, the rigid clamping ring is forced in the direction of the peripheral gable part in order to squeeze the elastic clamping ring such that it expands outwardly in the radial direction and clamps the edge of the jacket between itself and the stop member. The invention also relates to a shoe press roll that uses an elastic clamping ring with a hexagonal cross section for clamping of the jacket of the shoe press roll to the gables of the shoe press roll.

Clamping ring for an enclosed shoe press

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.

A press roll intended, together with a press shoe, to cooperate with a counter roll to form a press with long nip for paper or board machines, said press roll comprising two end walls, a jacket, the edge portions of which are secured by an elastic clamping ring to peripheral parts of the end walls, a form-stable clamping ring being screwed to the inner side of the end-wall part to clamp the outwardly expandable elastic clamping ring so that the edge portion of the jacket is clamped firmly against a counter-support member. According to the invention each end wall includes guide means to provide a guided engagement relationship between the form-stable clamping ring and the end-wall part. The guide means includes one axially concentric guide groove in the form-stable clamping ring and an axial, concentric guide flange in the end-wall part for cooperation with the guide groove, the guide groove defining radially externally a radial clamping surface disposed opposite a corresponding clamping surface of the end-wall part for cooperating clamping of the elastic clamping ring.

Growing community of inventors

Karlstad, Sweden

Lars O Gustavsson