Abstract: A method for dewatering a fibrous material web, wherein fibrous material is applied via a headbox on at least one wire and is subsequently dewatered in order to form a fibrous material web. Following the wire section, the resulting fibrous material web is dewatered by several presses, wherein the first press through which the fibrous material web is guided following the headbox is equipped with a double nip. The first press is formed by a wire roll and two couch rolls which are each pressed against the wire roll for forming a nip. Also disclosed is a corresponding device for carrying out the method.

Abstract: A suction roll for dewatering a fibrous web, having a rotatable and perforated suction roll jacket and a suction box in the interior of the suction roll. The suction box has a first suction channel that extends in the interior of the roll essentially along the axis of the suction roll. The suction box also has a second suction channel that extends in the interior of the roll along the inner surface of the suction roll jacket and is delimited by seals. The first suction channel is connected to the second suction channel via at least one connecting channel.

Abstract: A method for dewatering a fibrous material web, wherein fibrous material is applied via a headbox on at least one wire and is subsequently dewatered in order to form a fibrous material web. Following the wire section, the resulting fibrous material web is dewatered by several presses, wherein the first press through which the fibrous material web is guided following the headbox is equipped with a double nip. The first press is formed by a wire roll and two couch rolls which are each pressed against the wire roll for forming a nip. Also disclosed is a corresponding device for carrying out the method.

Abstract: A suction roll for dewatering a fibrous web, having a rotatable and perforated suction roll jacket and a suction box in the interior of the suction roll. The suction box has a first suction channel that extends in the interior of the roll essentially along the axis of the suction roll. The suction box also has a second suction channel that extends in the interior of the roll along the inner surface of the suction roll jacket and is delimited by seals. The first suction channel is connected to the second suction channel via at least one connecting channel.

Abstract: A process and apparatus for removing water from a mechanical pulp, chemical pulp or paper sheet, carried between top and bottom wires running through a dewatering machine having a first dewatering zone. The apparatus includes at least one suction box positioned downstream of the first dewatering zone. The process includes generating an air current in at least one of the wires downstream of the first dewatering zone with the suction box. The air current removes water from the wire and directs it into an inner chamber of the suction box. The invention also refers to a device for implementing the process.

Abstract: A process for the formation of fiberboard where the fiber stock suspension is dewatered on two sides between wires or felts, a top wire being provided in the main dewatering zone.

Abstract: A process and apparatus for removing water from a mechanical pulp, chemical pulp or paper sheet, carried between top and bottom wires running through a dewatering machine having a first dewatering zone. The apparatus includes at least one suction box positioned downstream of the first dewatering zone. The process includes generating an air current in at least one of the wires downstream of the first dewatering zone with the suction box. The air current removes water from the wire and directs it into an inner chamber of the suction box. The invention also refers to a device for implementing the process.

Abstract: A device for dewatering a pulp web having a dewatering section comprising top and bottom wires forming a wedge-shaped dewatering zone which can be adjusted and/or pressure-loaded at the downstream end, and with a pair of press rolls mounted at the end of the bottom wire. The top roll of the pair of press rolls is a shoe press roll.

Abstract: A process for the formation of fiberboard where the fiber stock suspension is dewatered on two sides between wires or felts, a top wire being provided in the main dewatering zone.

Abstract: A device for dewatering solid/liquid suspensions, especially pulp suspensions, where the suspension is dewatered between two belts, with one dewatering zone being a wedge zone. A pair of rolls downstream of the wedge zone impart both area pressure and line pressure on the pulp web formed by the pulp suspension.

Abstract: The invention relates to a device for dewatering and washing fibre stock suspensions with two counter-rotating rolls (2, 3), a stock feed (4, 5) and a stock discharge (6). It is mainly characterized by the headbox (4, 5) at the two rolls (2, 3) being arranged separately in the lower section of the rolls (2, 3), and a discharge screw (6) being foreseen for discharge of the filter mat below the gap between the two rolls (2, 3) and a washing zone (9″, 10″) in the upper part of the rolls (2, 3).

Abstract: The invention refers to a device for dewatering and/or washing suspensions, especially fibre stock suspensions, with two dewatering rolls rotating in opposite directions, where at least a further two guide rolls, especially press rolls, are provided and a woven, especially endless woven, wire or filter belt runs over each combination of one dewatering roll and one further guide roll, by which arrangement the suspension to be dewatered and/or washed is carried in the gap between the two belts and dewatered. The invention is mainly characterised by the two belts forming a vertical gap and by a device to guide the belts being mounted in the region of this vertical gap.

Abstract: The invention relates to a method and device for the washing of a medium consistency fibrous slurry, especially a chemical pulp slurry in which the slurry is fed at an inclined angle onto a substantially horizontal portion of circulating filter belt, and then distributed over substantially the entire working width of the filter belt. The distributed slurry is then washed with a washing liquid under localized pressure to produce a slurry having a medium consistency range, i.e., about 8 to 15 percent. In order to increase the consistency to 20 to 40 weight percent, preferably about 30 to about 35 weight percent, the washed slurry is passed to a pressing zone.

Abstract: An apparatus for determining the properties of a compactible material in which the material is continuously conveyed through a measuring zone at substantially constant pressure is provided. The apparatus includes an auger type conveyor housed in a housing. The housing has an inlet, the measuring zone and an outlet. The conveyor removes the material from a container or pipe and conveys the material through the measuring zone. The apparatus includes a flow constrictor adjacent the measuring zone for increasing the pressure of and compacting the material in the measuring zone.

Abstract: The invention relates to a method and device for the washing of a medium consistency fibrous slurry, especially a chemical pulp slurry in which the slurry is fed at an inclined angle onto a substantially horizontal portion of circulating filter belt, and then distributed over substantially the entire working width of the filter belt. The distributed slurry is then washed with a washing liquid under localized pressure to produce a slurry having a medium consistency range, i.e., about 8 to 15 percent. In order to increase the consistency to 20 to 40 weight percent, preferably about 30 to about 35 weight percent, the washed slurry is passed to a pressing zone.

Abstract: A double screen belt press for dewatering mixtures of fibrous material suspensions has a wedge compression zone comprising rolls and perforated plates supporting generally upper and lower screen belts. For dewatering mixtures of fibrous material suspensions having a high dry solids content, at least one sealed material feed empties into the wedge compression zone with a high pressure. A generally vertically gravity tower with an outlet port is provided to feed material into the entrance of the wedge compression zone above the lower screen belt and in front of the front roll supporting the upper screen belt. The outlet port area of the material feed is sealed on at least the side facing the lower screen belt and optionally on the side facing the upper screen belt and on the other side of the material feed facing away from the wedge compression zone between the material feed and the lower screen belt.

Abstract: The invention relates to an apparatus or plant or arrangement for the treatment of a dilute suspension of fibers or layer of material passed between two endless foraminous belts or wires or the like conveying means, the forming fibrous board being made to pass between the foraminous belts along at least one container for a treatment medium and at least some of the treatment containers being provided with a wall having orifices on the side facing the fibrous board for generating a pressure difference on the same, but being otherwise closed against the environment, and/or at least some of the treatment containers closed against the environment having walls closed against the foraminous belts and thus against the fibrous board, but otherwise open towards the foraminous belts. According to the invention, a reduction of the energy requirement in the displacement washing of filter cakes is sought above all.

Abstract: The invention relates to an improvement in a dehydration machine for wood pulp, sludges, or similar fibrous material, composed of a lower strainer operating as a support strainer and an upper strainer operating as the cover strainer, which loop support and reversing rolls and are adapted to pass jointly with the material to be dehydrated coming from a material feed through a wedging section and through pairs of pressing rolls in a pressing section, the improvement comprising a laterally sealed wedging section arranged substantially vertically or at an incline, followed directly by a reversal means provided with a lateral seal, and the pressing section including a group of rolls which at the beginning contains a pair of first and second pressing rolls mounted next to each other, with a pressing roll contacting the second pressing roll.

Abstract: Disclosed are methods and apparatus for rinsing soluble materials from the filter cake formed in a double belt press. The belts with the filter cake therebetween are suspended between two spaced apart rollers to relieve pressure on the filter cake and the filter cake is simultaneously exposed to a rinse medium. Pressure is thereafter re-applied to the filter cake to extract the rinse medium therefrom.

Abstract: This invention relates to a method for manufacturing a grooved roller where the grooving is continuous and extends from one rim of the roller to the other, which comprises cutting a groove of slight side angle and in the form of a thread on the periphery of the roller, and then pressing a contoured wire with prestressing into the groove.