EP0826819B1 - Apparatus for dewatering a fibre suspension - Google Patents

Apparatus for dewatering a fibre suspension Download PDF

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Publication number
EP0826819B1
EP0826819B1 EP97113282A EP97113282A EP0826819B1 EP 0826819 B1 EP0826819 B1 EP 0826819B1 EP 97113282 A EP97113282 A EP 97113282A EP 97113282 A EP97113282 A EP 97113282A EP 0826819 B1 EP0826819 B1 EP 0826819B1
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EP
European Patent Office
Prior art keywords
face
bent face
band
bent
recesses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP97113282A
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German (de)
French (fr)
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EP0826819A2 (en
EP0826819A3 (en
Inventor
Axel Gommel
Josef Schneid
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Voith Paper Fiber and Environmental Solutions GmbH and Co KG
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Voith Paper Fiber Systems GmbH and Co KG
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Priority claimed from DE1996135217 external-priority patent/DE19635217C2/en
Priority claimed from DE1996135293 external-priority patent/DE19635293C2/en
Application filed by Voith Paper Fiber Systems GmbH and Co KG filed Critical Voith Paper Fiber Systems GmbH and Co KG
Publication of EP0826819A2 publication Critical patent/EP0826819A2/en
Publication of EP0826819A3 publication Critical patent/EP0826819A3/en
Application granted granted Critical
Publication of EP0826819B1 publication Critical patent/EP0826819B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/80—Pulp catching, de-watering, or recovering; Re-use of pulp-water using endless screening belts

Definitions

  • the invention relates to a device for dewatering Fibrous suspension.
  • a device for dewatering Fibrous suspension has a curved surface, z. B. roller on by a screen belt on part of its circumference is entwined.
  • the screen belt and the outer surface of the roller form one Inlet gap for the fiber suspension to be dewatered.
  • WO 96/08600 describes such a device.
  • the curved one Surface formed as a roller the openings in the interior of the roller has and is sucked.
  • the roller is largely of a impermeable band enclosed on part of its circumference.
  • a major disadvantage of this device is that the attach impermeable tape when operating fibers that very quickly Form lumps of fibers and significantly interfere with the operation of the device. Around to clean the device it is necessary to stop the machine and to dismantle the tape.
  • the invention has for its object a device of the beginning mentioned type in such a way that a high drainage capacity What is achieved is that there are no or only minor cleaning problems.
  • the known principle is applied that a Relative speed between the lateral surface of the roller on the one hand and the sieve on the other hand.
  • the screen or the roller can during the Stand still completely, that means no translational at all Perform movement, but you can also use a variable Speed (e.g. creep speed).
  • a device according to the invention can be seen with a curved surface and a screen belt 2, which wraps around the curved surface over part of its circumference.
  • the curved surface is the surface of a roller 1 which has a curvature with the same radius R along its entire circumferential surface.
  • curved surfaces with a changing radius are also conceivable, for example those in which the radius decreases in the direction away from the wedge-shaped inlet gap that is formed by the curved surface or the jacket of the roller 1 and the wire belt 2 for supplying a fibrous suspension.
  • Fig. 1A Such an embodiment is shown in Fig. 1A.
  • the sieve belt 2 runs in the area of the slight curvature with radius R 1 and in the area of the strong curvature with radius R 2 .
  • Such a device can also be easily cleaned by the Body that is enclosed by the curved surfaces by 180 ° the center M is rotated. This will make the dirty side Easily accessible cleaning with only a short break in operation.
  • the aqueous fiber suspension moderately dewatered from the inlet gap.
  • Radius of the curved surface increases with the same tension of the Sieve belt 2 of the dewatering pressure on the between sieve belt 2 and curved surface or the outer surface of the suspension. Consequently can still high even with partially dewatered fiber suspension Drainage rates can be achieved.
  • Against the wedge-shaped Inlet gap 3 is directed to a machine-wide nozzle 4, which Fibrous suspension feeds the gap 3.
  • the sieve belt 2 is in this case an endless screen belt.
  • the outer surface of the roller is in the essentially smooth. However, it has elements that promote the promotion of Fibrous suspension in the direction of the rotation of the roller 1 and the Serving belt 2. These funding elements are in the following Figures shown in more detail. A rough surface would also be conceivable. All what is crucial in the present invention is that the curved surface or the outer surface of the roller and the roller itself none Has breakthroughs. The drainage does not find its way inside the roller as in WO 96/08600 but instead to the outside. This will ensured that the sieve belt 2 due to the constant flow of Contamination remains largely free.
  • Settling on the curved surface or lateral surface of the roller 1 Contamination can be removed without stopping the machine, for example, in that the contaminants from the rotating Roller or the circumferential curved surface by spray nozzles be hosed down.
  • the speeds of roller 1 and belt 2 are chosen such that between the speed of the outer surface of the roller 1 and the Sieve belt 2 there is a difference, and thus a relative speed between these two.
  • a more or less dry accumulation of fibers which can be in web form, but also in the form of Fiber rolls.
  • the dewatered fibers are known by suitable ones Means removed, for example, as shown on a customer roller delivered and scraped off there by a scraper.
  • this is Sieve belt 2 is not an endless belt, but has two ends.
  • the roller 1 runs around while the sieve belt 2 is in the direction of rotation or against Direction of rotation (see arrow 50) of roller 1 only moves very slowly. How you can see, the sieve belt is unrolled from a roll 2.1 and into one Roll 2.2 rolled up. Unrolling and reeling up take longer Periods.
  • the roller can be seen with axially parallel webs 1.10.
  • This Webs can extend across the entire width of the roller. You can however, can also be divided in their longitudinal direction, and the partial webs can in The circumferential direction of the roller 1 may be offset from one another.
  • the bridges 1.10 serve as conveying bodies for conveying the fiber suspension, the is again introduced into the gap 3 with the headbox nozzle 4.
  • the bridges can be dimensioned relatively small in the radial direction of the roller 1. in the in the present case, they are exaggerated. You can ... a radial extension from a few tenths of a millimeter to a few Have millimeters.
  • the mutual distance between the webs 1.10 can be few Centimeters, but also a few decimeters. The main thing is that the Webs have a promotional effect on the fiber suspension.
  • the sheet forms from Inlet gap 3 away in the circumferential direction of the roller a tapering gap. This has a higher drainage pressure and therefore an improved one Drainage.
  • the embodiment according to FIG. 3 is particularly interesting.
  • the jacket 1.1 of the roller 1 made of a material of a certain elasticity and Compressibility. It can be made of plastic, for example Polyurethane.
  • the curved surface shows in In the present example, the lateral surface 1.2 depressions 1.3 and elevations 1.4 on. In this representation it is wavy. It is from Sieve belt 2 enclosed.
  • the wells 1.3 represent a funding volume about the stock suspension, so that this in the direction of rotation of the roller is promoted. Drainage takes place during production Fibrous suspension through the sieve belt 2 instead of radially outwards - see the arrows running in the radial direction.
  • the outer surface 1.2 of the shell 1.1 is predominantly smooth.
  • the depressions 1.3 and increases 1.4 can be done in different ways be generated. So you can, for example, at regular intervals Provide parallel bores 1.5 of the roller axis. The consequence of this is that the wells 1.3 arise during operation.
  • the shell material body inserts which are also distributed over the circumference of the jacket 1.1 are. They can consist of bars that span the entire width of the Extend sheath 1.1. If this body has a different compressibility have than the rest of the jacket material, there is also a Wave surface 1.2.
  • strands in the sheath material embed which also extend in the direction parallel to the axis, and the are formed from multifilaments. These have a different compressibility, than the cladding material.
  • the holes 1.5 or in the holes inserted hoses at pressure sources or at vacuum sources be connected. In this way, the size of the wells can be 1.3 change, even during the operation of the device.
  • Figure 4 shows a further variant of the invention.
  • the formed as a roller 1 curved surface a support structure that in In the present embodiment, a cylindrical core 1.6.
  • This core can be a hollow cylinder or a solid cylinder.
  • strips 1.8 On the outer surface of the Core 1.6 are strips 1.8, which stand radially on the lateral surface and are attached to it, for example by welding.
  • the support structure or the core 1.6 with the strips 1.8 is from one Surround stocking 1.7.
  • the stocking is made of elastic material. He points a largely smooth outer surface. It is impermeable to water.
  • the Stocking 1.7 can be shrunk onto the radial strips 1.8 so that there is a wavy line in the shrinking process.
  • the spaces 1.9 between adjacent strips 1.8 can also under vacuum or overpressure can be set so that the wavy line is influenced or even can be changed during operation.
  • the embodiment according to FIG. 5 is honeycomb-shaped.
  • FIG. 6 shows a side view of another embodiment of the invention.
  • the roller shell 1.1 is again made up of a grid - see for example Figure 2 or Figure 3.
  • the roller 1 runs at a relatively high Speed around.
  • Band 2 on the other hand, is a finite band, i. H. it has two ends. It can be unrolled from a roll 2.1 and onto a roll 2.2 rolled up. It only moves with the device during operation Creep speed to avoid that the wear is always on and same place occurs.
  • the sheet forms from Inlet gap 3 away in the circumferential direction of the roller a tapering gap. This has a higher drainage pressure and therefore an improved one Drainage.

Landscapes

  • Filtration Of Liquid (AREA)
  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The apparatus for the extraction of water from a fibre suspension has an impermeable curved surface with a permeable belt (2) passing round it. The belt (2) and/or the curved surface are moved to give a relative speed between them. The curved surface has recesses, where each can hold a vol. of liquid.

Description

Die Erfindung betrifft eine Vorrichtung zum Entwässern einer Faserstoffsuspension. Eine solche Vorrichtung weist eine gekrümmte Fläche, z. B. Walze auf, die von einem Siebband auf einem Teil ihres Umfanges umschlungen ist. Siebband und Mantelfläche der Walze bilden einen Einlaufspalt für die zu entwässemde Faserstoffsuspension.The invention relates to a device for dewatering Fibrous suspension. Such a device has a curved surface, z. B. roller on by a screen belt on part of its circumference is entwined. The screen belt and the outer surface of the roller form one Inlet gap for the fiber suspension to be dewatered.

WO 96/08600 beschreibt eine derartige Vorrichtung. Hierbei ist die gekrümmte Fläche als Walze ausgebildet, die Durchbrechungen in das Walzeninnere aufweist und die besaugt ist. Die Walze wird von einem weitgehend undurchlässigen Band auf einem Teil ihres Umfangs umschlossen.WO 96/08600 describes such a device. Here is the curved one Surface formed as a roller, the openings in the interior of the roller has and is sucked. The roller is largely of a impermeable band enclosed on part of its circumference.

Ein großer Nachteil dieser Vorrichtung besteht darin, daß sich am undurchlässigen Band beim Betrieb Fasern anhängen, die sehr schnell Faserklumpen bilden und den Betrieb der Vorrichtung erheblich stören. Um die Vorrichtung zu reinigen ist es erforderlich, die Maschine stillzusetzen und das Band abzubauen.A major disadvantage of this device is that the attach impermeable tape when operating fibers that very quickly Form lumps of fibers and significantly interfere with the operation of the device. Around to clean the device it is necessary to stop the machine and to dismantle the tape.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art derart zu gestalten, daß eine hohe Entwässerungsleistung erzielt wird, daß aber keine oder nur geringe Reinigungsprobleme auftreten.The invention has for its object a device of the beginning mentioned type in such a way that a high drainage capacity What is achieved is that there are no or only minor cleaning problems.

Diese Aufgabe wird durch die Merkmale von Anspruch 1 gelöst.This object is solved by the features of claim 1.

Mit einer solchen Vorrichtung entstehen so gut wie keine Reinigungsprobleme bezüglich der Reinhaltung des die Walze umgebenden Bandes, da dieses im wesentlichen durchlässig ausgebildet ist und im Betrieb laufend freigespült wird. Außerdem kann es, falls erforderlich, außerhalb der Arbeitszone durch geeignete Mittel gereinigt werden. Ein weiterer Vorteil der Vorrichtung ist darin zu sehen, daß mit der erfindungsgemäßen Vorrichtung sehr hohe Trockengehalte erzielt werden können, je nach den gegebenen Betriebsparametern wie Stoffart der Faserstoffsuspension, Siebspannung, Umlaufgeschwindigkeit der Walze usw.. Der aus der Faserstoffsuspension gewonnene, mehr oder minder trockene Stoff liegt in Bahnform vor, gegebenenfalls auch in Form von Faserstoffröllchen, deren Achse beim Entstehen parallel zur Walzenachse verläuft und die einen Durchmesser von zwischen unter einem mm und mehreren mm haben können.With such a device there are almost no cleaning problems regarding the cleanliness of the belt surrounding the roller, since this in is essentially permeable and is continuously flushed during operation becomes. It can also pass outside of the work area if necessary suitable agents are cleaned. Another advantage of the device is that to see that with the device according to the invention very high Dryness levels can be achieved depending on the given Operating parameters such as the type of fiber suspension, fabric tension, Circulation speed of the roller, etc. The from the fiber suspension obtained, more or less dry material is in web form, if necessary also in the form of pulp rolls, the axis of which at Arise parallel to the roll axis and which have a diameter of can have between less than one mm and several mm.

Bei der Erfindung wird auch das bekannte Prinzip angewandt, daß eine Relativgeschwindigkeit zwischen der Mantelfläche der Walze einerseits und dem Sieb andererseits herrscht. Das Sieb oder die Walze kann während des Betriebes völlig stillstehen, das heißt überhaupt keine translatorische Bewegung ausführen, sie können aber auch mit einer variablen Geschwindigkeit (z. B. Kriechgeschwindigkeit) bewegt werden.In the invention, the known principle is applied that a Relative speed between the lateral surface of the roller on the one hand and the sieve on the other hand. The screen or the roller can during the Stand still completely, that means no translational at all Perform movement, but you can also use a variable Speed (e.g. creep speed).

Die Erfindung ist anhand der Zeichnungen näher erläutert. Darin ist im einzelnen folgendes dargestellt:

  • Figur 1 zeigt in einer Prinzipdarstellung eine erfindungsgemäße Vorrichtung.
  • Fig. 1A zeigt eine erst Abwandlung der erfindungsgemäßen Vorrichtung.
  • Figur 2 zeigt eine zweite Ausführungsform einer Vorrichtung der Erfindung.
  • Figur 2A zeigt eine Abwandlung der zweiten Ausführungsform der Erfindung.
  • Figur 3 zeigt eine dritte Ausführungsform der Erfindung.
  • Figur 4 zeigt eine vierte Ausführungsform der Erfindung.
  • Figur 5 zeigt eine sechste Ausführungsform der Erfindung.
  • Figur 7 zeigt eine achte Ausführungsform.
    • The invention is explained in more detail with reference to the drawings. The following is shown in detail:
  • Figure 1 shows a schematic representation of a device according to the invention.
  • 1A shows a first modification of the device according to the invention.
  • Figure 2 shows a second embodiment of a device of the invention.
  • Figure 2A shows a modification of the second embodiment of the invention.
  • Figure 3 shows a third embodiment of the invention.
  • Figure 4 shows a fourth embodiment of the invention.
  • Figure 5 shows a sixth embodiment of the invention.
  • Figure 7 shows an eighth embodiment.

    • Bei der Ausführungsform gemäß Figur 1 erkennt man eine Vorrichtung gemäß der Erfindung mit einer gekrümmten Fläche und einem Siebband 2, das die gekrümmte Fläche auf einem Teil ihres Umfanges umschlingt. In vorliegendem Ausführungsbeispiel ist die gekrümmte Fläche die Oberfläche einer Walze 1, die entlang ihrer gesamten Umfangsfläche eine Krümmung mit gleichem Radius R aufweist. Denkbar sind aber auch gekrümmte Flächen mit einem sich ändernden Radius, beispielsweise solche, bei denen der Radius in Richtung weg vom keilförmigen Einlaufspalt der von der gekrümmten Fläche bzw. dem Mantel der Walze 1 und dem Siebband 2 zum Zuführen einer Faserstoffsuspension gebildet wird, abnimmt. Eine solche Ausführungsform ist in Fig. 1A gezeigt. Hier läuft das Siebband 2 im Bereich der schwachen Krümmung mit Radius R1 auf und im Bereich der starken Krümmung mit Radius R2 wieder ab.In the embodiment according to FIG. 1, a device according to the invention can be seen with a curved surface and a screen belt 2, which wraps around the curved surface over part of its circumference. In the present exemplary embodiment, the curved surface is the surface of a roller 1 which has a curvature with the same radius R along its entire circumferential surface. However, curved surfaces with a changing radius are also conceivable, for example those in which the radius decreases in the direction away from the wedge-shaped inlet gap that is formed by the curved surface or the jacket of the roller 1 and the wire belt 2 for supplying a fibrous suspension. Such an embodiment is shown in Fig. 1A. Here the sieve belt 2 runs in the area of the slight curvature with radius R 1 and in the area of the strong curvature with radius R 2 .

    Eine derartige Vorrichtung kann auch leicht gereinigt werden, indem der Körper, der von den gekrümmten Flächen umschlossen wird, um 180° um den Mittelpunkt M gedreht wird. Hierdurch wird die verschmutzte Seite zur Reinigung leicht zugänglich bei nur kurzer Betriebsunterbrechung.Such a device can also be easily cleaned by the Body that is enclosed by the curved surfaces by 180 ° the center M is rotated. This will make the dirty side Easily accessible cleaning with only a short break in operation.

    Bei einer Ausführungsform gemäß Fig. 1A wird die wässrige Fasersuspension vom Einlaufspalt her zunächst mäßig entwässert. Mit geringer werdendem Radius der gekrümmten Fläche wächst bei gleicher Spannung des Siebbandes 2 der Entwässerungsdruck auf die zwischen Siebband 2 und gekrümmter Fläche bzw. der Mantelfläche befindlichen Suspension. Somit können auch bei bereits teilweise entwässerter Fasersuspension noch hohe Entwässerungsleistungen erreicht werden. Gegen den keilförmigen Einlaufspalt 3 ist eine maschinenbreite Düse 4 gerichtet, die die Faserstoffsuspension dem Spalt 3 zuführt. Das Siebband 2 ist in diesem Falle ein endloses Siebband.In an embodiment according to FIG. 1A, the aqueous fiber suspension moderately dewatered from the inlet gap. With decreasing Radius of the curved surface increases with the same tension of the Sieve belt 2 of the dewatering pressure on the between sieve belt 2 and curved surface or the outer surface of the suspension. Consequently can still high even with partially dewatered fiber suspension Drainage rates can be achieved. Against the wedge-shaped Inlet gap 3 is directed to a machine-wide nozzle 4, which Fibrous suspension feeds the gap 3. The sieve belt 2 is in this case an endless screen belt.

    In vorliegendem Ausführungsbeispiel ist die Mantelfläche der Walze im wesentlichen glatt. Sie weist jedoch Elemente auf, die der Förderung der Faserstoffsuspension in Richtung des Umlaufes der Walze 1 sowie des Siebbandes 2 dienen. Diese Förderelemente sind in den nachfolgenden Figuren genauer dargestellt. Auch eine rauhe Oberfläche wäre denkbar. Ganz entscheidend bei der vorliegenden Erfindung ist, daß die gekrümmte Fläche bzw. die Mantelfläche der Walze und die Walze selbst keine Durchbrechungen aufweist. Die Entwässerung findet damit nicht in das Innere der Walze wie bei der WO 96/08600 sondern nach außen statt. Hierdurch wird sichergestellt, daß das Siebband 2 aufgrund der steten Durchströmung von Verunreinigungen weitgehend frei bleibt.In the present exemplary embodiment, the outer surface of the roller is in the essentially smooth. However, it has elements that promote the promotion of Fibrous suspension in the direction of the rotation of the roller 1 and the Serving belt 2. These funding elements are in the following Figures shown in more detail. A rough surface would also be conceivable. All what is crucial in the present invention is that the curved surface or the outer surface of the roller and the roller itself none Has breakthroughs. The drainage does not find its way inside the roller as in WO 96/08600 but instead to the outside. This will ensured that the sieve belt 2 due to the constant flow of Contamination remains largely free.

    Sich auf der gekrümmten Fläche bzw. Mantelfläche der Walze 1 absetzenden Verunreinigungen können aber ohne Stillsetzen der Maschine entfernt werden, beispielsweise dadurch, daß die Verunreinigungen von der umlaufenden Walze bzw. der umlaufenden gekrümmten Fläche durch Spritzdüsen abgespritzt werden.Settling on the curved surface or lateral surface of the roller 1 Contamination can be removed without stopping the machine, for example, in that the contaminants from the rotating Roller or the circumferential curved surface by spray nozzles be hosed down.

    Die Geschwindigkeiten von Walze 1 und Siebband 2 sind derart gewählt, daß zwischen der Geschwindigkeit der Mantelfläche der Walze 1 und dem Siebband 2 ein Unterschied herrscht, und somit eine Relativgeschwindigkeit zwischen diesen beiden.The speeds of roller 1 and belt 2 are chosen such that between the speed of the outer surface of the roller 1 and the Sieve belt 2 there is a difference, and thus a relative speed between these two.

    Am Ende der Umschlingungszone des Siebbandes um die Mantelfläche der Walze 1 ist eine mehr oder minder trockene Ansammlung der Fasern gebildet, die in Bahnform vorliegen kann, gegebenenfalls aber auch in Form von Faserröllchen. Die entwässerten Fasern werden durch geeignete bekannte Mittel abgenommen, beispielsweise wie dargestellt an eine Abnehmerwalze abgegeben und dort von einem Schaber abgeschabt.At the end of the wrapping zone of the sieve belt around the outer surface of the Roller 1 is formed a more or less dry accumulation of fibers, which can be in web form, but also in the form of Fiber rolls. The dewatered fibers are known by suitable ones Means removed, for example, as shown on a customer roller delivered and scraped off there by a scraper.

    Bei der zweiten Ausführungsform der Erfindung gemäß Figur 2 ist das Siebband 2 kein endloses Band, sondern es hat zwei Enden. Die Walze 1 läuft um, während das Siebband 2 sich in Umlaufrichtung oder entgegen der Umlaufrichtung (siehe Pfeil 50) der Walze 1 nur ganz langsam bewegt. Wie man sieht, wird das Siebband dabei von einer Rolle 2.1 abgerollt und zu einer Rolle 2.2 aufgerollt. Abroll- und Aufrollvorgang erstrecken sich über längere Zeiträume.In the second embodiment of the invention according to FIG. 2, this is Sieve belt 2 is not an endless belt, but has two ends. The roller 1 runs around while the sieve belt 2 is in the direction of rotation or against Direction of rotation (see arrow 50) of roller 1 only moves very slowly. How you can see, the sieve belt is unrolled from a roll 2.1 and into one Roll 2.2 rolled up. Unrolling and reeling up take longer Periods.

    Die Walze ist in diesem Falle mit achsparallelen Stegen 1.10 zu sehen. Diese Stege können sich über die gesamte Breite der Walze erstrecken. Sie können jedoch auch in ihrer Längsrichtung unterteilt sein, und die Teilstege können in Umfangsrichtung der Walze 1 gegeneinander versetzt sein. Die Stege 1.10 dienen als Förderorgane zum Fördern der Faserstoffsuspension, die wiederum in den Spalt 3 mit der Stoffauflaufdüse 4 eingeleitet wird. Die Stege können in radialer Richtung der Walze 1 relativ gering bemessen sein. Im vorliegenden Falle sind sie übertrieben groß dargestellt. Sie können eine radiale Erstreckung von einigen wenigen zehntel Millimetern bis zu einigen Millimetern aufweisen. Der gegenseitige Abstand der Stege 1.10 kann wenige Zentimeter betragen, aber auch einige Dezimeter. Die Hauptsache ist, daß die Stege eine Förderwirkung auf die Faserstoffsuspension ausüben.In this case the roller can be seen with axially parallel webs 1.10. This Webs can extend across the entire width of the roller. You can however, can also be divided in their longitudinal direction, and the partial webs can in The circumferential direction of the roller 1 may be offset from one another. The bridges 1.10 serve as conveying bodies for conveying the fiber suspension, the is again introduced into the gap 3 with the headbox nozzle 4. The bridges can be dimensioned relatively small in the radial direction of the roller 1. in the in the present case, they are exaggerated. You can ... a radial extension from a few tenths of a millimeter to a few Have millimeters. The mutual distance between the webs 1.10 can be few Centimeters, but also a few decimeters. The main thing is that the Webs have a promotional effect on the fiber suspension.

    Auf dem Siebband 2 lastet eine gewisse Zugkraft. Diese ist einstellbar. Dies gilt auch für die anderen Ausführungsformen der Erfindung.There is a certain tensile force on the belt 2. This is adjustable. This also applies to the other embodiments of the invention.

    Daß sich das Siebband 2 mit Kriechgeschwindigkeit fortbewegt, von Rolle 2.1 zur Rolle 2.2, hat den Sinn, einen möglicherweise auftretenden Siebverschleiß bei Berührung mit den Stegen 1.10 nicht immer an denselben Stellen auftretenzulassen. Der Verschleiß wirkt sich auf diese Weise über die gesamte Siebbandlänge gleichmäßig aus.That the sieve belt 2 moves at creep speed, from role 2.1 to role 2.2, has the sense of possibly occurring screen wear not always in the same places when touching the bars 1.10 Allow occur. The wear affects in this way over the entire Screen belt length evenly.

    Es kann auch vorgesehen sein, anstelle des relativ flexiblen bzw. elastischen Siebbandes 2, ein starres, also noch nachgiebiges Blech, wie in Fig. 2A gezeigt, das wie das Siebband 2 mit seinen Enden 40, 41 eingespannt ist, sich aber vorzugsweise nicht bewegt, zu verwenden. Da die Entwässerung durch das Blech nach außen (siehe Pfeile) erfolgen soll, ist ein Lochblech besonders geeignet. It can also be provided instead of the relatively flexible or elastic one Sieve belt 2, a rigid, thus still flexible sheet, as in Fig. 2A shown that the ends of the sieve belt 2, 40, 41 are clamped, but preferably does not move to use. Because the drainage through the sheet to the outside (see arrows) is a perforated sheet particularly suitable.

    In einer besonders bevorzugten Ausführungsform bildet das Blech vom Einlaufspalt 3 weg in Umfangsrichtung der Walze einen verjüngenden Spalt. Dies hat einen höheren Entwässerungsdruck und damit eine verbesserte Entwässerung zur Folge.In a particularly preferred embodiment, the sheet forms from Inlet gap 3 away in the circumferential direction of the roller a tapering gap. This has a higher drainage pressure and therefore an improved one Drainage.

    Die Ausführungsform gemäß Figur 3 ist besonders interessant. Hierbei besteht der Mantel 1.1 der Walze 1 aus einem Material einer gewissen Elastizität und Kompressibilität. Er kann aus Kunststoff bestehen, zum Beispiel aus Polyurethan. Wie man sieht, weist die gekrümmte Fläche bzw. in vorliegendem Beispiel die Mantelfläche 1.2 Vertiefungen 1.3 und Erhöhungen 1.4 auf. In dieser Darstellung verläuft sie somit Wellenförmig. Sie ist vom Siebband 2 umschlossen. Die Vertiefungen 1.3 stellen ein Fördervolumen über die Stoffsuspension dar, so daß diese in Umlaufrichtung der Walze gefördert wird. Während der Förderung findet eine Entwässerung der Faserstoffsuspension durch das Siebband 2 radial nach außen statt - siehe die in radialer Richtung verlaufenden Pfeile.The embodiment according to FIG. 3 is particularly interesting. Here there is the jacket 1.1 of the roller 1 made of a material of a certain elasticity and Compressibility. It can be made of plastic, for example Polyurethane. As you can see, the curved surface shows in In the present example, the lateral surface 1.2 depressions 1.3 and elevations 1.4 on. In this representation it is wavy. It is from Sieve belt 2 enclosed. The wells 1.3 represent a funding volume about the stock suspension, so that this in the direction of rotation of the roller is promoted. Drainage takes place during production Fibrous suspension through the sieve belt 2 instead of radially outwards - see the arrows running in the radial direction.

    Im übrigen ist die Mantelfläche 1.2 des Mantels 1.1 vorwiegend glatt.Otherwise, the outer surface 1.2 of the shell 1.1 is predominantly smooth.

    Die Vertiefungen 1.3 und Erhöhungen 1.4 können auf verschiedene Weise erzeugt werden. So kann man beispielsweise in regelmäßigen Abständen zur Walzenachse parallele Bohrungen 1.5 vorsehen. Diese haben zur Folge, daß sich bei Betrieb die Vertiefungen 1.3 ergeben.The depressions 1.3 and increases 1.4 can be done in different ways be generated. So you can, for example, at regular intervals Provide parallel bores 1.5 of the roller axis. The consequence of this is that the wells 1.3 arise during operation.

    Eine weitere Möglichkeit besteht darin, daß man in das Mantelmaterial Körper einlegt, die ebenfalls über den Umfang des Mantels 1.1 verteilt angeordnet sind. Sie können aus Stäben bestehen, die sich über die gesamte Breite des Mantels 1.1 erstrecken. Wenn diese Körper eine andere Kompressibilität aufweisen, als das übrige Mantelmaterial, so kommt es ebenfalls zu einer Wellenform der Mantelfläche 1.2. Another possibility is that one in the shell material body inserts, which are also distributed over the circumference of the jacket 1.1 are. They can consist of bars that span the entire width of the Extend sheath 1.1. If this body has a different compressibility have than the rest of the jacket material, there is also a Wave surface 1.2.

    Eine weitere Möglichkeit besteht darin, in das Mantelmaterial Stränge einzubetten, die sich ebenfalls in achsparalleler Richtung strecken, und die aus Multifilamenten gebildet sind. Diese haben eine andere Kompressibilität, als das Mantelmaterial.Another option is to strands in the sheath material embed, which also extend in the direction parallel to the axis, and the are formed from multifilaments. These have a different compressibility, than the cladding material.

    Schließlich können die Bohrungen 1.5 beziehungsweise in die Bohrungen eingelegte Schläuche an Druckquellen oder an Unterdruckquellen angeschlossen werden. Auf diese Weise läßt sich die Größe der Vertiefungen 1.3 verändern, ja sogar während des Betriebes der Vorrichtung.Finally, the holes 1.5 or in the holes inserted hoses at pressure sources or at vacuum sources be connected. In this way, the size of the wells can be 1.3 change, even during the operation of the device.

    Figur 4 zeigt eine weitere Variante der Erfindung. In diesem Falle umfaßt die als Walze 1 ausgebildete gekrümmte Fläche eine Stützkonstruktion, die in vorliegender Ausführungsform ein zylindrischen Kern 1.6 ist. Dieser Kern kann ein Hohlzylinder oder ein Vollzylinder sein. An der Mantelfläche des Kernes 1.6 befinden sich Leisten 1.8, die radial auf der Mantelfläche stehen und an dieser beispielsweise durch Schweißen befestigt sind.Figure 4 shows a further variant of the invention. In this case, the formed as a roller 1 curved surface a support structure that in In the present embodiment, a cylindrical core 1.6. This core can be a hollow cylinder or a solid cylinder. On the outer surface of the Core 1.6 are strips 1.8, which stand radially on the lateral surface and are attached to it, for example by welding.

    Die Stützkonstruktion bzw. der Kem 1.6 mit den Leisten 1.8 ist von einem Strumpf 1.7 umgeben. Der Strumpf besteht aus elastischem Material. Er weist eine weitgehend glatte Außenfläche auf. Er ist wasserundurchlässig. Der Strumpf 1.7 kann auf die radialen Leisten 1.8 aufgeschrumpft sein, so daß sich beim Schrumpfprozeß eine Wellenlinie ergibt. Die Zwischenräume 1.9 zwischen einander benachbarten Leisten 1.8 können aber auch unter Vakuum oder Überdruck gesetzt werden, so daß die Wellenlinie beeinflußt oder gar während des Betriebes verändert werden kann.The support structure or the core 1.6 with the strips 1.8 is from one Surround stocking 1.7. The stocking is made of elastic material. He points a largely smooth outer surface. It is impermeable to water. The Stocking 1.7 can be shrunk onto the radial strips 1.8 so that there is a wavy line in the shrinking process. The spaces 1.9 between adjacent strips 1.8 can also under vacuum or overpressure can be set so that the wavy line is influenced or even can be changed during operation.

    Die Ausführungsform gemäß Figur 5 ist bienenwabenförmig.The embodiment according to FIG. 5 is honeycomb-shaped.

    Figur 6 zeigt in Seitenansicht eine weitere Ausführungsform der Erfindung. Dabei ist der Walzenmantel 1.1 wiederum aus einem Gitter aufgebaut - siehe beispielsweise Figur 2 oder Figur 3. Die Walze 1 läuft mit relativ hoher Geschwindigkeit um. Das Band 2 hingegen ist ein endliches Band, d. h. es hat zwei Enden. Es ist von einer Rolle 2.1 abrollbar und auf eine Rolle 2.2 aufrollbar. Während des Betriebes der Vorrichtung bewegt es sich nur mit Kriechgeschwindigkeit, um zu vermeiden, daß der Verschleiß stets an ein und derselben Stelle auftritt.Figure 6 shows a side view of another embodiment of the invention. The roller shell 1.1 is again made up of a grid - see for example Figure 2 or Figure 3. The roller 1 runs at a relatively high Speed around. Band 2, on the other hand, is a finite band, i. H. it has two ends. It can be unrolled from a roll 2.1 and onto a roll 2.2 rolled up. It only moves with the device during operation Creep speed to avoid that the wear is always on and same place occurs.

    Es kann auch vorgesehen sein, anstelle des relativ flexiblen bzw. elastischen Siebbandes 2, ein starres, aber noch nachgiebiges Blech, wie in Fig. 7 gezeigt, das wie das Siebband 2 mit seinen Enden 40, 41 eingespannt ist, sich aber vorzugsweise nicht bewegt, zu verwenden. Da die Entwässerung durch das Blech nach außen (siehe Pfeile) erfolgen soll, ist ein Lochblech besonders geeignet.It can also be provided instead of the relatively flexible or elastic one Sieve belt 2, a rigid, but still flexible sheet, as in FIG. 7 shown that the ends of the sieve belt 2, 40, 41 are clamped, but preferably does not move to use. Because the drainage through the sheet to the outside (see arrows) is a perforated sheet particularly suitable.

    In einer besonders bevorzugten Ausführungsform bildet das Blech vom Einlaufspalt 3 weg in Umfangsrichtung der Walze einen verjüngenden Spalt. Dies hat einen höheren Entwässerungsdruck und damit eine verbesserte Entwässerung zur Folge.In a particularly preferred embodiment, the sheet forms from Inlet gap 3 away in the circumferential direction of the roller a tapering gap. This has a higher drainage pressure and therefore an improved one Drainage.

    Claims (28)

    1. Apparatus for dewatering a fibre suspension;
      1.1 with a bent face looped by a permeable band (2);
      1.2 the bent face is impermeable;
      1.3 the band (2) and/or the bent face can be moved in such a way that there is relative speed between band (2) and the bent face;
      1.4 the bent face has recesses which can each receive a quantity of liquid.
    2. Apparatus according to claim 1, characterised in that the bent face is at least almost smooth.
    3. Apparatus according to either claim 1 or 2, characterised in that the recesses can each receive a quantity of the fibre suspensions.
    4. Apparatus according to any one of claims 1 to 3, characterised in that the recesses are formed from a plurality of spherical dents.
    5. Apparatus according to any one of claims 1 to 4, characterised in that the recesses are formed from a plurality of spherical humps.
    6. Apparatus according to claim 4 or 5, characterised in that the dents or humps are uniformly distributed over the bent face.
    7. Apparatus according to claim 1, characterised in that the recesses are formed from grooves extending substantially transversely to the direction of the relative movement of band and face.
    8. Apparatus according to claim 7, characterised in that the grooves are divided in longitudinal portions.
    9. Apparatus according to any one of claims 1, 7 or 8, characterised in that a plurality of strips (1.10) are provided to form the recesses.
    10. Apparatus according to any one of claims 1 to 9, characterised by the following features:
      10.1 The bent face consists of an elastically deformable material;
      10.2 The bent face is provided with holes on the end face extending substantially transversely to the relative direction of movement up to the other end face.
    11. Apparatus according to claim 10, characterised in that the holes can be inflated or evacuated.
    12. Apparatus according to claim 1, characterised by the following features;
      12.1 The apparatus comprises a supporting construction (1.6);
      12.2 The supporting construction (1.6) is surrounded by a stocking (1.7) made of elastic material;
      12.3 Supporting members (1.8) are provided between the elastic sheathing and the supporting construction.
    13. Apparatus according to claim 12, characterised in that the gaps (1.9) between supporting members (1.8) respectively adjoining one another can be inflated or evacuated.
    14. Apparatus according to any one of claims 1 to 13, characterised in that the bent faces form a roller which can be driven at relatively high speed and in that the band (2) has two ends and runs off a take-off roller (2.1) at creep speed and is wound onto a take-up roller (2.2), this process being reversible.
    15. Apparatus according to any one of claims 1 to 14, characterised in that the band is designed as a substantially elastic wire band.
    16. Apparatus according to any one of claims 1 to 14, characterised in that the band is designed as a rigid non-positive face.
    17. Apparatus according to claim 16, characterised in that the rigid non-positive face is a bent perforated plate arranged above the bent face.
    18. Apparatus according to any one of claims 1 to 17, characterised in that the bent face, measured to a central point, has different radii in its course.
    19. Apparatus according to claim 18, characterised in that the radii reduce in the direction of the band rotation in such a way that with the same screening tension the dewatering pressure is thus increased.
    20. Apparatus according to any one of claims 1 to 19, characterised in that cleaning apparatuses are arranged near the bent face and/or near the permeable band to remove impurities.
    21. Apparatus according to claims 1 to 20, characterised in that the recesses are covered by a covering screen.
    22. Apparatus according to claim 21, characterised in that the covering screen envelopes the bent face.
    23. Apparatus for dewatering a fibre suspension;
      23.1 with a bent face looped by a permeable band (2);
      23.2 the bent face is impermeable;
      23.3 the band (2) and/or the bent face can be moved in such a way that there is relative speed between band (2) and the bent face;
      23.4 the bent face has recesses which can each receive a quantity of liquid;
      23.5 the bent face has a grid structure to form the recess.
    24. Apparatus according to claim 23, characterised in that the recesses can each receive a quantity of fibre suspensions.
    25. Apparatus according to claim 24, characterised in that the grid structure is formed in a honeycomb shape.
    26. Apparatus according to claim 24 or 25, characterised in that the bent face is the peripheral face or the casing of a roller (1).
    27. Apparatus according to any one of claims 24 to 26, characterised in that the recesses are covered by a screen.
    28. Apparatus according to claim 27, characterised in that the screen envelopes the bent face.
    EP97113282A 1996-08-30 1997-08-01 Apparatus for dewatering a fibre suspension Expired - Lifetime EP0826819B1 (en)

    Applications Claiming Priority (4)

    Application Number Priority Date Filing Date Title
    DE1996135217 DE19635217C2 (en) 1996-08-30 1996-08-30 Device for dewatering a fiber suspension
    DE1996135293 DE19635293C2 (en) 1996-08-30 1996-08-30 Device for dewatering a fiber suspension
    DE19635217 1996-08-30
    DE19635293 1996-08-30

    Publications (3)

    Publication Number Publication Date
    EP0826819A2 EP0826819A2 (en) 1998-03-04
    EP0826819A3 EP0826819A3 (en) 1999-02-24
    EP0826819B1 true EP0826819B1 (en) 2002-11-20

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97113282A Expired - Lifetime EP0826819B1 (en) 1996-08-30 1997-08-01 Apparatus for dewatering a fibre suspension

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    US (1) US6036029A (en)
    EP (1) EP0826819B1 (en)
    AT (1) ATE228183T1 (en)
    DE (1) DE59708756D1 (en)

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    DE19806402A1 (en) * 1998-02-17 1999-08-19 Voith Sulzer Papiertech Patent Process for merging two suspension layers and thickening device
    US6190506B1 (en) * 1998-10-29 2001-02-20 Voith Sulzer Papiertechnik Patent Gmbh Paper making apparatus having pressurized chamber
    US20020117169A1 (en) * 2001-02-27 2002-08-29 Kurz Daniel R. Cover and applicator for a portion of a mammalian body
    CA2357388A1 (en) 2001-05-01 2002-11-01 Sebright Products, Inc. Belt filter press with improved wedge section, wing roller, belt washer, and belt positioning assembly
    DE60320821D1 (en) * 2002-10-11 2008-06-19 Sentina Biotechnology Inc
    US8133401B2 (en) * 2005-04-14 2012-03-13 Rdp Company Method and apparatus for treating lime slurry for grit removal
    US20100256464A1 (en) * 2007-05-14 2010-10-07 Dr. Susan Love Research Foundation Device for determining risk of developing breast cancer and method thereof

    Family Cites Families (11)

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    Publication number Priority date Publication date Assignee Title
    US50158A (en) * 1865-09-26 Improvement in cider-mills
    US838615A (en) * 1904-11-02 1906-12-18 Gustav Goldman Machine for finishing garment-pads of matted or felted fibers.
    US1595894A (en) * 1925-07-03 1926-08-10 Frederic P Klund Machine for thickening pulp
    US2365658A (en) * 1939-06-20 1944-12-19 American Voith Contact Co Inc Apparatus for the removal of water, liquors, or other liquids from soaked masses of fibrous materials
    AT385297B (en) * 1985-12-23 1988-03-10 Andritz Ag Maschf DEVICE IN THE AREA OF THE SURFACE OF ROLLS OR CYLINDERS FOR OR ON A MACHINE TO MAKE PAPER, PAPPE OD. DGL. TO REMOVE POLLUTION
    US4722793A (en) * 1986-07-03 1988-02-02 The Black Clawson Company Apparatus and method for thickening pulp and paper stock
    CA1331708C (en) * 1988-10-28 1994-08-30 Peter Seifert Apparatus for thickening pulp and paper stock
    DE4105803C2 (en) * 1991-02-23 1997-02-13 Voith Gmbh J M Device for thickening fiber suspensions
    DE9102171U1 (en) * 1991-02-23 1991-05-16 J.M. Voith Gmbh, 7920 Heidenheim Dewatering device for suspensions
    SE501772C2 (en) * 1993-09-30 1995-05-15 Kvaerner Pulp Equipment As Method and apparatus for increasing the yield upon dewatering of a fiber suspension
    SE503543C2 (en) * 1994-09-14 1996-07-01 Kvaerner Hymac As Method and apparatus for concentrating a fiber suspension

    Also Published As

    Publication number Publication date
    DE59708756D1 (en) 2003-01-02
    US6036029A (en) 2000-03-14
    ATE228183T1 (en) 2002-12-15
    EP0826819A2 (en) 1998-03-04
    EP0826819A3 (en) 1999-02-24

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