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 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: 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 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: 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.