Abstract: Apparatus for removing fiber webs from fiber conveying supports are disclosed including a doctor beam, a doctor blade having a web contacting edge, a hose for fluids for applying a force between the doctor beam and the doctor blade when pressurized to move the web contacting edge towards the fiber conveying support, the fiber web having a basis weight over 1000 g/m2, the doctor blade and doctor beam being pivotably attached, and the hose arranged for applying the force at a distance form the pivotable attachment to move the web contacting edge by pivoting the doctor blade relative to the doctor beam.

Abstract: Methods for dewatering a fiber suspension in a twin-wire press, having a lower wire and an upper wire, and a first and a second dewatering table, which supports the wires such that a dewatering space is defined by the wires, are disclosed. The wires transport the fiber suspension under compression of the wires by the dewatering tables, such that the fiber suspension is dewatered and forms a fiber web between the wires. A separate pressing force is applied against one of the wires, such that this wire presses the formed fiber web via the second wire against one of the dewatering tables and further dewaters the fiber web. The separate pressing force is adjusted such that a desired dryness of the fiber web leaving the dewatering tables is achieved. A twin-wire press is also disclosed.

Abstract: A distribution unit for adding a fiber suspension to an inlet space in a dewatering press is disclosed. The distribution unit comprises a distribution housing, which forms at least one distribution slit intended to be connected to the inlet space of the dewatering press, and at least one inlet member for adding the fiber suspension to the distribution slit. The distribution housing is provided with at least one opening to the distribution slit and a matching hatch for sealing the opening. The hatch is hinged to the distribution housing so that it is pivotable relative to the distribution housing between a first position and a second position. An inlet box is also disclosed comprising a number of the distribution units.

Abstract: A frame for a twin-wire press is disclosed including pairs of side members including upper and lower side members arranged on opposite sides of the press, between which upper and lower rolls are attached, a plurality of transverse beams arranged between the pairs of side members which themselves are sections of flat sheet metal and spacers for mutually releasably connecting the side members with the sheet metal being formed so that it permits a degree of curing in the vertical plane to facilitate access to the space between the upper and lower rolls. A method for exchanging wire in a twin-wire press of this type is also disclosed.

Abstract: Twin-wire presses are disclosed for dewatering fiber suspensions comprising endless upper and lower wires defining a dewatering space, upper and lower wire guides for guiding the wires obliquely towards the inlet end of the dewatering space, and upper and lower wedge-shaped seals extending from an inlet box towards the dewatering space inlet to create a seal in the tapering space between the wires and the fiber suspension entering the dewatering space. The inner surfaces of the wedge-shaped seals define a passage for the fiber suspension and the outer surfaces extend at an acute angle towards the inner surfaces so that at least part of the seals are sealed against the wires and the distance between the inner surfaces of the seals is substantially equal to the distance between the wires at the dewatering space inlet.

Abstract: A method for dewatering a fiber suspension in a twin-wire press is disclosed including feeding the fiber suspension to an inlet end of an elongated dewatering space, dewatering the fiber suspension during displacement of the endless lower and upper wires which form the elongated dewatering space by flowing filtrate through the endless lower and upper wires, collecting the filtrate in outlet boxes, and adjusting the pressure differential between the elongated dewatering space and each of the upper and lower outlet boxes by controlling the counter-pressure applied to the filtrate flow on both sides of the endless upper and lower wires directly adjacent the inlet end of the dewatering space. A twin-wire press is also disclosed therein.

Abstract: A frame for a twin-wire press is disclosed including pairs of side members including upper and lower side members arranged on opposite sides of the press, between which upper and lower rolls are attached, a plurality of transverse beams arranged between the pairs of side members which themselves are sections of flat sheet metal and spacers for mutually releasably connecting the side members with the sheet metal being formed so that it permits a degree of curing in the vertical plane to facilitate access to the space between the upper and lower rolls. A method for exchanging wire in a twin-wire press of this type is also disclosed.

Abstract: Methods for dewatering a fiber suspension in a twin-wire press, having a lower wire and an upper wire, and a first and a second dewatering table, which supports the wires such that a dewatering space is defined by the wires, are disclosed. The wires transport the fiber suspension under compression of the wires by the dewatering tables, such that the fiber suspension is dewatered and forms a fiber web between the wires. A separate pressing force is applied against one of the wires, such that this wire presses the formed fiber web via the second wire against one of the dewatering tables and further dewaters the fiber web. The separate pressing force is adjusted such that a desired dryness of the fiber web leaving the dewatering tables is achieved. A twin-wire press is also disclosed.

Abstract: The present invention relates to a method for machining of a surface (31) of a roll in a twin-wire press (2), comprising lower rolls (4, 6, 8, 25?), an endless lower wire (10), upper rolls (14, 16, 18, 25?), and an endless upper wire (12). The rolls comprise a coating (32). An apparatus (50) having a movable machining tool (54) for machining of the coating (32) is arranged in connection to a space between a wire (10, 12) and a roll (4, 6, 8, 14, 16, 18, 25?, 25?). The machining tool (54) of the apparatus is moved, in contact against the surface of the roll (31) for cutting of the coating (32) to a desired level during rotation of the roll. The present invention also relates to an apparatus (50) for machining of a surface (31) of a roll in a twin-wire press for dewatering of a fibre suspension comprising said apparatus.

Abstract: The present invention relates to a method for dewatering of a fibre suspension in a twin-wire press (2), according to which method the fibre suspension is fed to an oblong dewatering space (4), that is defined by an endless lower wire (6) and an endless upper wire (8) of the twin-wire press, against which wires lower and upper perforated dewatering elements are arranged outside the dewatering space, and the fibre suspension is dewatered in the dewatering space (4) during displacement of the wires, such that a flow of filtrate from the dewatering space (4) through the wires (6, 8) and the perforated dewatering elements is formed, filtrate that flows from the dewatering space through the wires is collected in outlet boxes (18, 20), that the pressure difference between the dewatering space (4) and at least an outlet box (18, 20) is adjusted by controlling at least a counter pressure that is applied on at least a portion of the flow of filtrate.

Abstract: A twin-wire belt press is disclosed for dewatering a fiber suspension and forming a continuous web of the fiber suspension. The twin wire belt includes a plurality of upper and lower rolls, a perforated roll and endless upper and lower wire belts. Dewatering tables are used to support the endless upper and lower wire belts and form a wedge-shaped pressure space between the endless upper and lower wire belts for initially pressing and dewatering the fiber suspension and forming a web therebetween. Roll members, including at least two press rolls which form press roll nips with the perforated roll and another roll, press and dewater the web between the endless upper and lower wire belts.

Abstract: A twin-wire belt press for dewatering of a fibre suspension and forming of a continuous web thereof comprises two dewatering tables (11, 12) forming a wedge-shaped pressure space (13) between the wire belts (5, 6) for initially pressing and dewatering the fibre suspension, whereby a web is formed between the wire belts. A roll arrangement (14) is situated after the dewatering tables, as seen in the direction of movement of the wire belts, for finally pressing and dewatering the web between the wire belts. The roll arrangement comprises at least on perforated hole roll (15) pressing against the wire belts. As a result, white-water that the hole roll presses out of the web between the wire belts is drained at least in part through the hole roll without rewetting the web.

Abstract: Apparatus is disclosed for handling a web including a pair of juxtaposed press rolls providing a nip therebetween, a coarse shredder trough disposed above the nip to receive the web from the nip, and a doctor arrangement for transferring the web from the outer surfaces of the press roll including a doctor support extending longitudinally of the pair of press rolls and a plurality of doctor blades attached to the doctor supports and extending in abutment with the outer surfaces of the press rolls, the doctor arrangement being supported by the coarse shredder trough whereby the doctor blades form a rigid structure for the plurality of doctor blades.

Abstract: Pulp-dewatering apparatus is disclosed including a pair of press rolls and a rotatable pulp disintegrating screw above the nip region between the press rolls, and the apparatus includes a pair of doctor bars associated with the pair of press rolls, each doctor bar including a doctor blade for removing pulp from the surface of its associated press roll, and in which one of the doctor blades is disposed adjacent to the nip region below the pulp disintegrating screw such that the space between the pair of press rolls and the pulp disintegrating screw in which a pulp cake can form is substantially reduced.

Abstract: Apparatus for sealing a roll press including a seal extending along at least one of a pair of press rolls, the seal including a resilient member extending from the vat in which the press rolls are disposed towards one of the press rolls and a wear member attached to the resilient member for contacting the outer shell surface of the vat press roll whereby the wear member can be replaced upon wearing down of same.