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EP2714988B1 - Fibre sorting system - Google Patents

Fibre sorting system Download PDF

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Publication number
EP2714988B1
EP2714988B1 EP12719963.6A EP12719963A EP2714988B1 EP 2714988 B1 EP2714988 B1 EP 2714988B1 EP 12719963 A EP12719963 A EP 12719963A EP 2714988 B1 EP2714988 B1 EP 2714988B1
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EP
European Patent Office
Prior art keywords
rotor blades
jet
rotor
fibrous material
rotation
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EP12719963.6A
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German (de)
French (fr)
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EP2714988A1 (en
Inventor
Marc Perrin
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP2714988A1 publication Critical patent/EP2714988A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/22—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in apparatus with a vertical axis
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D99/00—Subject matter not provided for in other groups of this subclass

Definitions

  • the invention relates to a method for removing long fibers from a pulp suspension.
  • the invention also relates to a device for removing long fibers from a pulp suspension with a rotor having rotor blades, in particular for carrying out the method.
  • the fibers When a new pulp suspension is prepared from wood or when recovered paper is converted to a pulp suspension, the fibers generally have very different lengths. It may then be advantageous to separate the short cellulose fibers from long cellulose fibers, especially to be able to produce paper sheets with different qualities.
  • the recovery of a long fiber fraction containing long fibers and, for example, free of mineral contents may also be of interest.
  • the US 4,427,541 again, describes a method for removing long fibers from a pulp suspension, wherein a jet of the pulp suspension is directed onto a rotor disk and the jet direction with the axis of rotation forms an angle of less than 45 °.
  • pulp suspension also extends to fibers containing process or wastewater, in which the recovery of the fibers is in the foreground.
  • the object of the invention is therefore to make the sorting of long fibers as simple and efficient as possible.
  • this object is achieved in that a jet of pulp suspension is directed to the rotor blades of a rotor, wherein the jet direction with the rotation axis forms an angle of less than 45 ° and longer fibers adhering to the rotor blades are thrown off the rotor blades due to the centrifugal force and are collected separately.
  • the process according to the invention for separating a long fiber fraction from a pulp suspension hardly causes any risk of clogging. Therefore, the invention is also suitable for the treatment of pulp suspensions with fabric densities up to 3.5%, preferably up to 3.5%.
  • the method is very efficient, since predominantly only the long fibers stick to the rotor blades, collect, slide radially outward on the rotor blades and are thrown off from there.
  • the beam direction of the pulp suspension jet should be approximately parallel to the axis of rotation of the rotor.
  • the jet of pulp suspension is accelerated before striking the rotor blades. This acceleration causes alignment of the fibers in the flow direction, which assists in capturing the long fibers by the rotor blades.
  • the speed of the pulp suspension jet when hitting the rotor blades is between 3 and 20 m / s and / or the peripheral speed of the rotor blades is between 10 and 70, preferably between 20 and 40 m / s. In this way it is ensured that as far as possible only the long fibers adhere to the rotor blades, wherein the proportion of removed long fibers can be increased by increasing the peripheral speed.
  • the pulp suspension jet should at least predominantly, preferably exclusively extend only over a radially inner region of the rotor blades.
  • a comprehensive use of the rotor blades can be achieved, in particular, if the pulp suspension jet has an annular cross-section enclosing the axis of rotation of the rotor. It is advantageous if the annular pulp suspension jet has a ring thickness between 1 and 5 mm.
  • the device according to the invention is essential that a jet of pulp suspension is directed to the rotor blades of the rotor, the jet direction with the rotation axis forms an angle of less than 45 °, the rotor blades have a pointing in the direction of rotation vane edge and in the centrifugal region of the rotor blade collecting chambers for arranged by the rotor blades thrown, longer fibers are arranged.
  • the wing edge should support the collection, collection and centrifuging of the long fiber fraction into the catchment chambers. Therefore, it is advantageous if the wing edge has a thickness between 0.2 and 2 mm.
  • the rotor blades In order to ensure that the short fibers and fillers of the pulp suspension flow past the rotor blades as easily as possible, it is advantageous for the rotor blades to have a flat profile, preferably running in the direction of rotation, or to have a wedge-shaped cross section in the direction of rotation, the wedge tip pointing in the direction of rotation and forms the wing edge or are formed as wires or flexible threads.
  • the radial sliding out of the long fibers to the spin along the wing edge can be assisted by the fact that the wing edge extends radially outwardly at least in one, preferably at least the outermost portion with respect to the radial inclined towards the rotational direction, wherein the angle between this inclined section and the radial should be between 30 ° and 70 °.
  • the effect of the rotor blades can be further increased if the leading edges are not sharp, but have a certain rounding, as can be generated, for example, by electropolishing.
  • the beam direction of the pulp suspension jet should be approximately parallel to the axis of rotation of the rotor. This makes it possible that the pulp suspension jet is annular and is guided coaxially with the rotor.
  • the jet should be directed at the rotor blades via a jet accelerating jet. It is advantageous if the distance between the nozzle and the rotor blades is less than 20 mm, preferably less than 10 and in particular less than 5 mm.
  • the small distance between the nozzle outlet and the rotor blades ensures that the orientation of the fibers in the direction of flow, which is increased as a result of the jet acceleration in the nozzle, remains as extensive as possible until it hits the rotor blades.
  • the rotor blades have a length between 5 and 30 mm, preferably between 10 and 20 mm and / or the rotor with the rotor blades sweeps a circular area with a diameter between 300 and 1,500 mm.
  • annular pulp suspension jet 1 is formed and directed to the rotor blades 2 of a rotor.
  • the molded body 8 causes an increase in the flow rate of the pulp suspension 1 and thereby an increased orientation of the fibers in the flow direction which supports the detection of long fibers by the rotor blades 2. So that an orientation of the fibers is not lost too much, the distance between the exit of the jet from the nozzle and the rotor blades 2 is only 5 mm.
  • the rotor is driven here by a motor 9 arranged below.
  • the jet direction of the pulp suspension jet 1 coincides with the rotor axis 3 of the rotor, wherein the velocity of the pulp suspension jet 1 when impinging on the rotor blades 2 is between 3 and 20 m / s and the peripheral speed of the rotor blades 2 is between 20 and 40 m / s. If the proportion of long fibers separated off via the rotor blades 2 is to be increased, then the peripheral speed of the rotor blades 2 is to be increased for this purpose.
  • the centrifuging is not affected by the pulp suspension jet 1, the pulp suspension jet 1 is directed only to the radially inner part of the rotor blades 2, wherein the ring thickness is between 1 and 5 mm and the rotor blades 2 have a length between 10 and 20 mm.
  • the rotor with the rotor blades 2 sweeps over a circular area with a diameter between 300 and 1,500 mm, which ensures sufficient capacity even with an annular pulp suspension jet 1 in conjunction with the desired flow rate.
  • annular pulp suspension jet 1 Since the annular pulp suspension jet 1 is arranged coaxially to the axis of rotation 3, results in an optimal and uniform effect.
  • the rotor blades 2 In order to assist the capture of the long fibers when cutting through the pulp suspension jet 1, the rotor blades 2 have an electropolished surface and a vane edge 5 with a thickness with respect to the beam direction between 0.2 and 2 mm.
  • the rotor blades 2 according to FIG. 2 are formed by wires which, although straight here, are inclined with respect to the radials counter to the direction of rotation 4 at an angle 12. Due to the inclination of the wing edge 5, the adherent, long fibers on the same easier to slide radially outward and fly from there into the collecting chamber 6.
  • FIG. 3 shows the possibility that the rotor blades 2 are connected to each other via their radially inner ends and a radially inner rotor ring 11.
  • the rotor blades 2 together with the Rotor ring 11 are relatively inexpensively made of a metal sheet, wherein the sheet thickness between 0.2 and 2 mm and the width of the rotor blades 2 in the direction of rotation 4 is between 1 and 5 mm.
  • the rotor blades 2, as in FIG. 5 shown, have a flat and extending in the direction of rotation 4 cross-sectional profile.
  • the rotor blades 2 accordingly FIG. 4 have a wedge-shaped cross section in the direction of rotation 4, wherein the wedge tip points in the direction of rotation 4 and the wing edge 5 forms.
  • This cross-section also facilitates the shorter fibers passing through the rotor blades 2.
  • a plurality of sorting devices according to the invention can also use a common axis of rotation and thus also a common drive 9.
  • the sorting devices can be operated in series or in parallel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Entfernen von Langfasern aus einer Faserstoffsuspension.The invention relates to a method for removing long fibers from a pulp suspension.

Die Erfindung betrifft auch eine Vorrichtung zum Entfernen von Langfasern aus einer Faserstoffsuspension mit einem Rotor mit Rotorflügeln, insbesondere zur Durchführung des Verfahrens.The invention also relates to a device for removing long fibers from a pulp suspension with a rotor having rotor blades, in particular for carrying out the method.

Wenn eine neue Faserstoffsuspension aus Holz zubereitet oder wenn zurückgewonnenes Papier in eine Faserstoffsuspension umgewandelt wird, haben die Fasern im Allgemeinen sehr unterschiedliche Längen. Es kann dann vorteilhaft sein, die kurzen Zellulosefasern von langen Zellulosefasern zu trennen, vor allem um Papierblätter mit unterschiedlichen Qualitäten herstellen zu können.When a new pulp suspension is prepared from wood or when recovered paper is converted to a pulp suspension, the fibers generally have very different lengths. It may then be advantageous to separate the short cellulose fibers from long cellulose fibers, especially to be able to produce paper sheets with different qualities.

Gewöhnlich ist es dabei das Ziel, einerseits eine Kurzfaserfraktion, die überwiegend kurze Fasern enthält, deren mittlere Längen in der Größenordnung von unter einem Millimeter liegen, und andererseits eine Langfaserfraktion zu erhalten, die überwiegend Langfasern enthält, deren mittlere Längen in der Größenordnung von über eineinhalb Millimeter liegen.It is usually the goal, on the one hand a short fiber fraction containing predominantly short fibers whose average lengths are of the order of less than one millimeter, and on the other hand to obtain a long fiber fraction containing predominantly long fibers whose average lengths in the order of about one and a half Millimeters lie.

Die Gewinnung einer Langfaserfraktion, die lange Fasern enthält und beispielsweise frei von Mineralgehalten ist, kann ebenfalls interessant sein.The recovery of a long fiber fraction containing long fibers and, for example, free of mineral contents may also be of interest.

Meist werden derartige Anordnungen jedoch benutzt, um Altpapierfaser-Rohstoffe so weit aufzubereiten, dass sie als Rohstoff wieder zur Herstellung von Faserstoffbahnen verwendet werden können.Most such arrangements are used, however, to recycle recovered paper fiber raw materials so that they can be used as raw material again for the production of fibrous webs.

Gemischtes Altpapier besteht oft aus verschiedenen Sorten und hat im Vergleich zu Frischzellstoff ein relativ breites Faserlängenspektrum.Mixed waste paper often consists of different grades and has a relatively broad fiber length spectrum compared to virgin pulp.

Hierzu ist es aus der DE 2018510 bekannt, die Faserstoffsuspension auf ein Lochsieb zu spritzen, wobei die Löcher jedoch zum Verstopfen neigen.For this it is from the DE 2018510 known to spray the pulp suspension on a perforated screen, but the holes tend to clog.

In der WO 01/29297 wird daher vorgeschlagen, ein Siebelement an einer Düse vorbeizuführen. Dabei wird das Siebelement von Drähten o.ä. gebildet, die in Bewegungsrichtung des Siebes verlaufen. Die Düse befindet sich außerhalb der Schleife des Siebelementes.In the WO 01/29297 Therefore, it is proposed to pass a sieve element on a nozzle. The screen element of wires or the like. formed, which run in the direction of movement of the wire. The nozzle is located outside the loop of the sieve element.

Auch dies kann hinsichtlich der Fraktionierwirkung noch nicht befriedigen.This, too, can not satisfy the fractionation effect.

Eine Verbesserung hinsichtlich des Fraktionierverfahrens konnte mit der WO 2010/018120 erreicht werden, bei der ein zylinderförmiges Siebelement von Stäben gebildete Sortierschlitze besitzt. Jedoch sind der Herstellungsaufwand und der Energiebedarf für die Freihaltung der Sortierschlitze mittels Reinigungsdüse relativ hoch.An improvement in terms of the fractionation process could be achieved with the WO 2010/018120 can be achieved, in which a cylindrical sieve element has sorting slots formed by rods. However, the production cost and the energy requirements for keeping clear the sorting slots by means of cleaning nozzle are relatively high.

Die US 4 427 541 wiederum beschreibt ein Verfahren zum Entfernen von Langfasern aus einer Faserstoffsuspension, wobei ein Strahl der Faserstoffsuspension auf eine Rotorscheibe gerichtet wird und die Strahlrichtung mit der Rotationsachse einen Winkel von weniger als 45° bildet.The US 4,427,541 again, describes a method for removing long fibers from a pulp suspension, wherein a jet of the pulp suspension is directed onto a rotor disk and the jet direction with the axis of rotation forms an angle of less than 45 °.

Ähnlich verhält es sich auch, wenn unerwünschte Bestandteile der Faserstoffsuspension durch Waschen entfernt werden sollen. Hinsichtlich der Erfindung erstreckt sich der Begriff Faserstoffsuspension auch auf Fasern enthaltende Prozess- oder Abwässer, bei denen die Rückgewinnung der Fasern im Vordergrund steht.The situation is similar when unwanted constituents of the pulp suspension are to be removed by washing. With regard to the invention, the term pulp suspension also extends to fibers containing process or wastewater, in which the recovery of the fibers is in the foreground.

Die Aufgabe der Erfindung ist es daher das Aussortieren von Langfasern möglichst einfach und effizient zu gestalten.The object of the invention is therefore to make the sorting of long fibers as simple and efficient as possible.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass ein Strahl der Faserstoffsuspension auf die Rotorflügel eines Rotors gerichtet wird, wobei die Strahlrichtung mit der Rotationsachse einen Winkel von weniger als 45° bildet und längere an den Rotorflügeln haftenbleibende Fasern infolge der Zentrifugalkraft von den Rotorflügeln abgeschleudert und separat aufgefangen werden.According to the invention this object is achieved in that a jet of pulp suspension is directed to the rotor blades of a rotor, wherein the jet direction with the rotation axis forms an angle of less than 45 ° and longer fibers adhering to the rotor blades are thrown off the rotor blades due to the centrifugal force and are collected separately.

Im Gegensatz zur üblichen Verwendung eines Siebes besteht bei dem erfindungsgemäßen Verfahren zur Abtrennung einer Langfaserfraktion aus einer Faserstoffssuspension kaum Gefahr einer Verstopfung. Daher eignet sich die Erfindung auch zur Behandlung von Faserstoffsuspensionen mit Stoffdichten bis zu 3,5%, vorzugsweise bis 3,5%.In contrast to the usual use of a sieve, the process according to the invention for separating a long fiber fraction from a pulp suspension hardly causes any risk of clogging. Therefore, the invention is also suitable for the treatment of pulp suspensions with fabric densities up to 3.5%, preferably up to 3.5%.

Außerdem ist das Verfahren sehr effizient, da überwiegende nur die langen Fasern an den Rotorflügeln haftenbleiben, sich sammeln, an den Rotorflügeln radial nach außen rutschen und von dort abgeschleudert werden.In addition, the method is very efficient, since predominantly only the long fibers stick to the rotor blades, collect, slide radially outward on the rotor blades and are thrown off from there.

Um dies um die Rotationsachse herum möglichst gleichmäßig zu gestalten, sollte die Strahlrichtung des Faserstoffsuspensionsstrahles etwa parallel zur Rotationsachse des Rotors verlaufen.To make this around the rotation axis as uniform as possible, the beam direction of the pulp suspension jet should be approximately parallel to the axis of rotation of the rotor.

Hierbei ist es von Vorteil, wenn der Strahl der Faserstoffsuspension vor dem Auftreffen auf die Rotorflügel beschleunigt wird. Diese Beschleunigung bewirkt eine Ausrichtung der Fasern in Strömungsrichtung, was das Erfassen der Langfasern durch die Rotorflügel unterstützt.It is advantageous if the jet of pulp suspension is accelerated before striking the rotor blades. This acceleration causes alignment of the fibers in the flow direction, which assists in capturing the long fibers by the rotor blades.

Des Weiteren hat es sich als vorteilhaft erwiesen, wenn die Geschwindigkeit des Faserstoffsuspensionsstrahls beim Auftreffen auf die Rotorflügel zwischen 3 und 20 m/s und/oder die Umfangsgeschwindigkeit der Rotorflügel zwischen 10 und 70, vorzugsweise zwischen 20 und 40 m/s liegt. Auf diese Weise wird sichergestellt, dass möglichst nur die langen Fasern an den Rotorflügeln haftenbleiben, wobei der Anteil an entfernten Langfasern durch eine Erhöhung der Umfangsgeschwindigkeit vergrößert werden kann.Furthermore, it has proved to be advantageous if the speed of the pulp suspension jet when hitting the rotor blades is between 3 and 20 m / s and / or the peripheral speed of the rotor blades is between 10 and 70, preferably between 20 and 40 m / s. In this way it is ensured that as far as possible only the long fibers adhere to the rotor blades, wherein the proportion of removed long fibers can be increased by increasing the peripheral speed.

Damit das radiale Hinausgleiten und Abschleudern der Langfasern nicht beeinträchtigt wird, sollte sich der Faserstoffsuspensionsstrahl zumindest überwiegend, vorzugsweise ausschließlich nur über einen radial inneren Bereich der Rotorflügel erstrecken.So that the radial sliding out and spinning of the long fibers is not impaired, the pulp suspension jet should at least predominantly, preferably exclusively extend only over a radially inner region of the rotor blades.

Eine umfassende Nutzung der Rotorflügel kann insbesondere dann erreicht werden, wenn der Faserstoffsuspensionsstrahl einen ringförmigen, die Rotationsachse des Rotors umschließenden Querschnitt besitzt. Dabei ist es von Vorteil, wenn der ringförmige Faserstoffsuspensionsstrahl eine Ringdicke zwischen 1 und 5 mm aufweist.A comprehensive use of the rotor blades can be achieved, in particular, if the pulp suspension jet has an annular cross-section enclosing the axis of rotation of the rotor. It is advantageous if the annular pulp suspension jet has a ring thickness between 1 and 5 mm.

Hinsichtlich der erfindungsgemäßen Vorrichtung ist wesentlich, dass ein Strahl der Faserstoffsuspension auf die Rotorflügel des Rotors gerichtet wird, wobei die Strahlrichtung mit der Rotationsachse einen Winkel von weniger als 45° bildet, die Rotorflügel eine in Rotationsrichtung weisende Flügelkante aufweisen und im Schleuderbereich der Rotorflügel Auffangkammern für die von den Rotorflügeln abgeschleuderten, längeren Fasern angeordnet sind.With regard to the device according to the invention is essential that a jet of pulp suspension is directed to the rotor blades of the rotor, the jet direction with the rotation axis forms an angle of less than 45 °, the rotor blades have a pointing in the direction of rotation vane edge and in the centrifugal region of the rotor blade collecting chambers for arranged by the rotor blades thrown, longer fibers are arranged.

Dabei soll die Flügelkante das Auffangen, Sammeln und Abschleudern der Langfaserfraktion in die Auffangkammern unterstützen. Daher ist es vorteilhaft, wenn die Flügelkante eine Dicke zwischen 0,2 und 2 mm hat.The wing edge should support the collection, collection and centrifuging of the long fiber fraction into the catchment chambers. Therefore, it is advantageous if the wing edge has a thickness between 0.2 and 2 mm.

Um zu gewährleisten, dass die kurzen Fasern und Füllstoffe der Faserstoffsuspension möglichst problemlos an den Rotorflügeln vorbeiströmen, ist es von Vorteil, wenn die Rotorflügel ein flaches, vorzugsweise in Rotationsrichtung verlaufendes Profil aufweisen oder in Rotationsrichtung einen keilförmigen Querschnitt besitzen, wobei die Keilspitze in Rotationsrichtung weist und die Flügelkante bildet oder aber als Drähte oder flexible Fäden ausgebildet sind.In order to ensure that the short fibers and fillers of the pulp suspension flow past the rotor blades as easily as possible, it is advantageous for the rotor blades to have a flat profile, preferably running in the direction of rotation, or to have a wedge-shaped cross section in the direction of rotation, the wedge tip pointing in the direction of rotation and forms the wing edge or are formed as wires or flexible threads.

Unabhängig von der Gestaltung der Rotorflügel kann das radiale Hinausgleiten der Langfasern bis zum Abschleudern entlang der Flügelkante dadurch unterstützt werden, dass die Flügelkante radial nach außen zumindest in einem, vorzugsweise wenigstens dem äußersten Abschnitt bezüglich der Radialen entgegen der Rotationsrichtung geneigt verläuft, wobei der Winkel zwischen diesem geneigten Abschnitt und der Radialen zwischen 30° und 70° liegen sollte.Regardless of the design of the rotor blades, the radial sliding out of the long fibers to the spin along the wing edge can be assisted by the fact that the wing edge extends radially outwardly at least in one, preferably at least the outermost portion with respect to the radial inclined towards the rotational direction, wherein the angle between this inclined section and the radial should be between 30 ° and 70 °.

Die Wirkung der Rotorflügel lässt sich des Weiteren steigern, wenn deren Vorderkanten nicht scharf sind, sondern eine gewisse Rundung aufweisen, wie dies bspw. durch Elektropolieren erzeugt werden kann.The effect of the rotor blades can be further increased if the leading edges are not sharp, but have a certain rounding, as can be generated, for example, by electropolishing.

Zur symmetrischen Ausbildung sollte die Strahlrichtung des Faserstoffsuspensionsstrahles etwa parallel zur Rotationsachse des Rotors verlaufen. Dies ermöglicht es, dass der Faserstoffsuspensionsstrahl ringförmig ausgebildet ist und koaxial zum Rotor geführt wird.For symmetrical design, the beam direction of the pulp suspension jet should be approximately parallel to the axis of rotation of the rotor. This makes it possible that the pulp suspension jet is annular and is guided coaxially with the rotor.

Außerdem sollte der Strahl über eine, den Strahl beschleunigende Düse auf die Rotorflügel gerichtet werden. Dabei ist es von Vorteil, wenn der Abstand zwischen der Düse und den Rotorflügeln kleiner als 20 mm, vorzugsweise kleiner als 10 und insbesondere kleiner als 5 mm ist.In addition, the jet should be directed at the rotor blades via a jet accelerating jet. It is advantageous if the distance between the nozzle and the rotor blades is less than 20 mm, preferably less than 10 and in particular less than 5 mm.

Der geringe Abstand zwischen dem Düsenaustritt und den Rotorflügeln sorgt dafür, dass die infolge der Strahlbeschleunigung in der Düse verstärkte Ausrichtung der Fasern in Strömungsrichtung möglichst umfassend bis zum Auftreffen auf die Rotorflügel erhalten bleibt.The small distance between the nozzle outlet and the rotor blades ensures that the orientation of the fibers in the direction of flow, which is increased as a result of the jet acceleration in the nozzle, remains as extensive as possible until it hits the rotor blades.

Dabei hat es sich hinsichtlich der Effizienz als vorteilhaft erwiesen, wenn die Rotorflügel eine Länge zwischen 5 und 30 mm, vorzugsweise zwischen 10 und 20 mm haben und/oder der Rotor mit den Rotorflügeln eine Kreisfläche mit einem Durchmesser zwischen 300 und 1.500 mm überstreicht.It has proven to be advantageous in terms of efficiency when the rotor blades have a length between 5 and 30 mm, preferably between 10 and 20 mm and / or the rotor with the rotor blades sweeps a circular area with a diameter between 300 and 1,500 mm.

Nachfolgend soll die Erfindung an mehreren Ausführungsbeispielen näher erläutert werden.The invention will be explained in more detail below with reference to several exemplary embodiments.

In der beigefügten Zeichnung zeigt:

  • Figur 1: einen schematischen Querschnitt durch eine Sortiervorrichtung;
  • Figuren 2 und 3: eine Draufsicht auf einen Rotor mit unterschiedlichen Rotorflügeln 2;
  • Figuren 4 bis 6: einen Querschnitt durch verschiedene Rotorflügel 2.
In the attached drawing shows:
  • FIG. 1 a schematic cross section through a sorting device;
  • FIGS. 2 and 3 a plan view of a rotor with different rotor blades 2;
  • FIGS. 4 to 6 : a cross section through different rotor blades 2.

Wie in Figur 1 zu erkennen, wird in der Sortiervorrichtung zur Abspaltung einer überwiegend längere Fasern enthaltenden Langfaserfraktion aus einer Faserstoffsuspension zur Herstellung einer Papierbahn über einen zentral in einer Düse angeordneten Formkörper 8 ein ringförmiger Faserstoffsuspensionsstrahl 1 gebildet und auf die Rotorflügel 2 eines Rotors gerichtet.As in FIG. 1 can be seen in the sorter for splitting a long fiber fraction containing predominantly longer fibers from a pulp suspension for producing a paper web via a centrally arranged in a nozzle mold body 8, an annular pulp suspension jet 1 is formed and directed to the rotor blades 2 of a rotor.

Bei einer Störung oder einem Stillstand wird der Spalt zwischen dem, den Strahl 1 außen begrenzenden Düsengehäuse 13 und dem Formkörper 8 vergrößert. Dies ist bei dem in Figur 1 gezeigtem Beispiel einfach durch eine Verschiebung des Düsengehäuses 13 entgegen der Strömungsrichtung möglich.In the event of a fault or a standstill, the gap between the nozzle housing 13 delimiting the jet 1 on the outside and the molded body 8 is increased. This is at the in FIG. 1 Example shown simply by a displacement of the nozzle housing 13 against the flow direction possible.

Dies soll ein Verstopfen des Spaltes mit Fasern verhindern.This is to prevent clogging of the gap with fibers.

Der Formkörper 8 bewirkt dabei eine Erhöhung der Strömungsgeschwindigkeit der Faserstoffsuspension 1 und dabei eine verstärkte Ausrichtung der Fasern in Strömungsrichtung was die Erfassung der Langfasern durch die Rotorflügel 2 unterstützt. Damit eine Ausrichtung der Fasern nicht zu stark verloren geht, beträgt der Abstand zwischen dem Austritt des Strahls aus der Düse und den Rotorflügeln 2 nur 5 mm.The molded body 8 causes an increase in the flow rate of the pulp suspension 1 and thereby an increased orientation of the fibers in the flow direction which supports the detection of long fibers by the rotor blades 2. So that an orientation of the fibers is not lost too much, the distance between the exit of the jet from the nozzle and the rotor blades 2 is only 5 mm.

Der Rotor wird hier von einem unterhalb angeordneten Motor 9 angetrieben.The rotor is driven here by a motor 9 arranged below.

Dabei stimmt die Strahlrichtung des Faserstoffsuspensionsstrahls 1 mit der Rotorachse 3 des Rotors überein, wobei die Geschwindigkeit des Faserstoffsuspensionsstrahls 1 beim Auftreffen auf die Rotorflügel 2 zwischen 3 und 20 m/s und die Umfangsgeschwindigkeit der Rotorflügel 2 zwischen 20 und 40 m/s liegt. Soll der Anteil an über die Rotorflügel 2 abgeteilten Langfasern erhöht werden, so ist hierzu die Umfangsgeschwindigkeit der Rotorflügel 2 zu erhöhen.The jet direction of the pulp suspension jet 1 coincides with the rotor axis 3 of the rotor, wherein the velocity of the pulp suspension jet 1 when impinging on the rotor blades 2 is between 3 and 20 m / s and the peripheral speed of the rotor blades 2 is between 20 and 40 m / s. If the proportion of long fibers separated off via the rotor blades 2 is to be increased, then the peripheral speed of the rotor blades 2 is to be increased for this purpose.

Beim Durchschneiden des Faserstoffsuspensionsstrahls 1 bleiben überwiegend längere Fasern an den Rotorflügeln 2 hängen. Diese können sich dort ansammeln und werden infolge der Zentrifugalkraft an den Rotorflügeln 2 radial nach außen wandern und anschließend abgeschleudert.When cutting through the pulp suspension jet 1, predominantly longer fibers remain suspended on the rotor blades 2. These can accumulate there and are due to the centrifugal force on the rotor blades 2 to move radially outward and then thrown off.

Damit das Abschleudern nicht durch den Faserstoffsuspensionsstrahl 1 beeinträchtigt wird, wird der Faserstoffsuspensionsstrahl 1 nur auf den radial inneren Teil der Rotorflügel 2 gerichtet, wobei die Ringstärke zwischen 1 und 5 mm liegt und die Rotorflügel 2 eine Länge zwischen 10 und 20 mm haben.Thus, the centrifuging is not affected by the pulp suspension jet 1, the pulp suspension jet 1 is directed only to the radially inner part of the rotor blades 2, wherein the ring thickness is between 1 and 5 mm and the rotor blades 2 have a length between 10 and 20 mm.

Außerdem überstreicht der Rotor mit den Rotorflügeln 2 eine Kreisfläche mit einem Durchmesser zwischen 300 und 1.500 mm, was auch bei einem ringförmigen Faserstoffsuspensionsstrahl 1 in Verbindung mit der angestrebten Strömungsgeschwindigkeit für eine ausreichende Kapazität sorgt.In addition, the rotor with the rotor blades 2 sweeps over a circular area with a diameter between 300 and 1,500 mm, which ensures sufficient capacity even with an annular pulp suspension jet 1 in conjunction with the desired flow rate.

Da der ringförmige Faserstoffsuspensionsstrahl 1 koaxial zur Rotationsachse 3 angeordnet ist, ergibt sich eine optimale und gleichmäßige Wirkung.Since the annular pulp suspension jet 1 is arranged coaxially to the axis of rotation 3, results in an optimal and uniform effect.

Zum Auffangen der langen, von den Rotorflügeln 2 abgeschleuderten Fasern (Langfaserfraktion) verläuft um den Rotor im entsprechenden Schleuderbereich eine Auffangkammer 6. Der Rest der Faserstoffsuspension passiert die Rotorflügel 2 und wird darunter in einer Auffangwanne 10 aufgefangen und abgeführt.To catch the long, thrown off from the rotor blades 2 fibers (long fiber fraction) runs around the rotor in the corresponding spin area a collecting chamber 6. The rest of the pulp suspension passes through the rotor blades 2 and is collected and removed in a drip pan 10 below.

Um das Einfangen der langen Fasern beim Durchschneiden des Faserstoffsuspensionsstrahls 1 zu unterstützen, haben die Rotorflügel 2 eine elektropolierte Oberfläche und eine Flügelkante 5 mit einer Dicke bezogen auf die Strahlrichtung zwischen 0,2 und 2 mm.In order to assist the capture of the long fibers when cutting through the pulp suspension jet 1, the rotor blades 2 have an electropolished surface and a vane edge 5 with a thickness with respect to the beam direction between 0.2 and 2 mm.

In besonders einfacher Form können die Rotorflügel 2 gemäß Figur 2 von Drähten gebildet werden, die hier zwar gerade verlaufen aber bezüglich der Radialen entgegen der Rotationsrichtung 4 mit einem Winkel 12 geneigt sind. Durch die Neigung der Flügelkante 5 können die haftengebliebenen, langen Fasern an derselben leichter radial nach außen gleiten und von dort in die Auffangkammer 6 fliegen.In a particularly simple form, the rotor blades 2 according to FIG. 2 are formed by wires which, although straight here, are inclined with respect to the radials counter to the direction of rotation 4 at an angle 12. Due to the inclination of the wing edge 5, the adherent, long fibers on the same easier to slide radially outward and fly from there into the collecting chamber 6.

Demgegenüber zeigt Figur 3 die Möglichkeit, dass die Rotorflügel 2 über ihre radial innen liegenden Enden und einen radial innen verlaufenden Rotorring 11 miteinander verbunden sind. Auf diese Weise können die Rotorflügel 2 gemeinsam mit dem Rotorring 11 relativ kostengünstig aus einem Blech gefertigt werden, wobei die Blechdicke zwischen 0,2 und 2 mm und die Breite der Rotorflügel 2 in Rotationsrichtung 4 zwischen 1 und 5 mm liegt.In contrast, shows FIG. 3 the possibility that the rotor blades 2 are connected to each other via their radially inner ends and a radially inner rotor ring 11. In this way, the rotor blades 2 together with the Rotor ring 11 are relatively inexpensively made of a metal sheet, wherein the sheet thickness between 0.2 and 2 mm and the width of the rotor blades 2 in the direction of rotation 4 is between 1 and 5 mm.

Dabei können die Rotorflügel 2, wie in Figur 5 dargestellt, ein flaches und in Rotationsrichtung 4 verlaufendes Querschnitt-Profil aufweisen.In this case, the rotor blades 2, as in FIG. 5 shown, have a flat and extending in the direction of rotation 4 cross-sectional profile.

Alternativ ist es jedoch auch möglich, dass die Rotorflügel 2 entsprechend Figur 4 in Rotationsrichtung 4 einen keilförmigen Querschnitt besitzen, wobei die Keilspitze in Rotationsrichtung 4 weist und die Flügelkante 5 bildet.Alternatively, it is also possible that the rotor blades 2 accordingly FIG. 4 have a wedge-shaped cross section in the direction of rotation 4, wherein the wedge tip points in the direction of rotation 4 and the wing edge 5 forms.

Auch dieser Querschnitt erleichtert den kürzeren Fasern das Passieren der Rotorflügel 2.This cross-section also facilitates the shorter fibers passing through the rotor blades 2.

Um das Gleiten der langen Fasern radial nach außen zu erleichtern, kann die Flügelkante 5, wie Figur 6 zeigt, radial nach außen betrachtet in Strahlrichtung des Faserstoffsuspensionsstrahles 1 geneigt sein.To facilitate the sliding of the long fibers radially outward, the wing edge 5, as FIG. 6 shows, viewed radially outward in the beam direction of the pulp suspension jet 1 to be inclined.

In einer bevorzugten Ausführung können auch mehrere erfindungsgemäße Sortiervorrichtungen eine gemeinsame Rotationsachse und damit auch einen gemeinsamen Antrieb 9 benutzen. Dabei können die Sortiervorrichtungen in Reihenoder Parallelschaltung betrieben werden.In a preferred embodiment, a plurality of sorting devices according to the invention can also use a common axis of rotation and thus also a common drive 9. The sorting devices can be operated in series or in parallel.

Claims (24)

  1. Method for removing long fibres from a fibrous material suspension, wherein a jet (1) of the fibrous material suspension is aimed at the rotor blades (2) of a rotor, the jet direction forms an angle of less than 45° with the axis of rotation (3), and longer fibres remaining stuck to the rotor blades (2) are thrown off the rotor blades (2) as a result of the centrifugal force and are caught separately.
  2. Method according to Claim 1, characterized in that the jet direction of the fibrous material suspension jet (1) runs approximately parallel to the axis of rotation (3) of the rotor.
  3. Method according to Claim 1 or 2, characterized in that the jet (1) of the fibrous material suspension is accelerated before impinging on the rotor blades (2).
  4. Method according to one of the preceding claims, characterized in that the speed of the fibrous material suspension jet (1) as it impinges on the rotor blades (2) is between 3 and 20 m/s.
  5. Method according to one of the preceding claims, characterized in that the peripheral speed of the rotor blades (2) is between 10 and 70, preferably between 20 and 40 m/s.
  6. Method according to one of the preceding claims, characterized in that the peripheral speed is increased in order to increase the proportion of long fibres removed.
  7. Method according to one of the preceding claims, characterized in that the fibrous material suspension jet (1) extends at least predominantly, preferably exclusively, over a radially inner region of the rotor blades (2).
  8. Method according to Claim 7, characterized in that the fibrous material suspension jet (1) has an annular cross section enclosing the axis of rotation (3) of the rotor.
  9. Method according to Claim 8, characterized in that the annular fibrous material suspension jet (1) has an annular thickness between 1 and 5 mm.
  10. Device for removing long fibres from a fibrous material suspension by using a rotor with rotor blades (2), wherein a jet (1) of the fibrous material suspension is aimed at the rotor and the jet direction forms an angle of less than 45° with the axis of rotation (3), in particular for carrying out the method according to one of the preceding claims, characterized in that a jet (1) of the fibrous material suspension is aimed at the rotor blades (2) of the rotor, wherein the rotor blades (2) have a blade edge (5) pointing in the direction of rotation (4), and collecting chambers (6) for the longer fibres thrown off the rotor blades (2) are arranged in the centrifugal area of the rotor blades (2).
  11. Device according to Claim 10, characterized in that the jet direction of the fibrous material suspension jet (1) runs approximately parallel to the axis of rotation (3) of the rotor.
  12. Device according to Claim 10 or 11, characterized in that the jet (1) is aimed at the rotor blades (2) via a nozzle accelerating the jet (1).
  13. Device according to Claim 12, characterized in that the distance between the nozzle and the rotor blades (2) is less than 20 mm, preferably less than 10 and in particular less than 5 mm.
  14. Device according to one of Claims 10 to 13, characterized in that the rotor blades (2) have a length between 5 and 30 mm, preferably between 10 and 20 mm.
  15. Device according to one of Claims 10 to 14, characterized in that the rotor with the rotor blades (2) sweeps over a circular area with a diameter between 300 and 1500 mm.
  16. Device according to one of Claims 10 to 15, characterized in that the blade edge (5) has a thickness between 0.2 and 2 mm.
  17. Device according to one of Claims 10 to 16, characterized in that the rotor blades (2) have a flat profile, preferably extending in the direction of rotation (4).
  18. Device according to one of Claims 10 to 16, characterized in that the rotor blades (2) have a wedge-shaped cross section in the direction of rotation (4), wherein the tip of the wedge points in the direction of rotation (4) and forms the blade edge (5).
  19. Device according to one of Claims 10 to 16, characterized in that the rotor blades (2) are formed as wires.
  20. Device according to one of Claims 10 to 19, characterized in that the blade edge (5) runs radially outwards at an angle counter to the direction of rotation (4), at least in one section, preferably at least the outermost section with respect to the radial.
  21. Device according to Claim 20, characterized in that the angle (12) between the angled section of the blade edge (5) and the radial is between 30 and 70°.
  22. Device according to one of Claims 10 to 16, characterized in that the rotor blades (2) are formed as flexible filaments.
  23. Device according to one of Claims 10 to 22, characterized in that the rotor blades (2), in particular their leading edges, are electropolished.
  24. Device according to one of Claims 10 to 23, characterized in that the fibrous material suspension jet (1) is annular and is guided coaxially with respect to the rotor.
EP12719963.6A 2011-05-26 2012-05-08 Fibre sorting system Not-in-force EP2714988B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110076518 DE102011076518A1 (en) 2011-05-26 2011-05-26 fiber screening
PCT/EP2012/058412 WO2012159876A1 (en) 2011-05-26 2012-05-08 Fibre sorting system

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EP2714988A1 EP2714988A1 (en) 2014-04-09
EP2714988B1 true EP2714988B1 (en) 2015-07-08

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EP12719963.6A Not-in-force EP2714988B1 (en) 2011-05-26 2012-05-08 Fibre sorting system

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EP (1) EP2714988B1 (en)
CN (1) CN103547733B (en)
DE (1) DE102011076518A1 (en)
WO (1) WO2012159876A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102012215964A1 (en) * 2012-09-10 2014-03-13 Voith Patent Gmbh fiber screening
CN108468245B (en) * 2018-05-30 2024-03-26 山东杰锋机械制造有限公司 Outflow type low-pulse net front-flowing pressure screen

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Publication number Priority date Publication date Assignee Title
SE339165B (en) 1969-04-22 1971-09-27 Calor & Sjoegren Ab
US4427541A (en) * 1982-04-28 1984-01-24 Wisconsin Alumni Research Foundation Method and apparatus for spray fractionation of particles in liquid suspension
US4742919A (en) * 1986-04-11 1988-05-10 Beloit Corporation Rotating separator
WO2001029297A1 (en) 1999-10-20 2001-04-26 Auckland Uniservices Limited A method of fibre separation
WO2005046879A1 (en) * 2003-11-14 2005-05-26 Akzo Nobel N.V. Separation apparatus and method
CN2736409Y (en) * 2004-01-07 2005-10-26 中国印钞造币总公司 Heavy materials separator with high-speed rotating impeller
CN102119248A (en) 2008-08-11 2011-07-06 沃依特专利有限责任公司 Arrangement for fractionating a suspension of fibrous material

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CN103547733B (en) 2016-08-31
EP2714988A1 (en) 2014-04-09
DE102011076518A1 (en) 2012-11-29
WO2012159876A1 (en) 2012-11-29
CN103547733A (en) 2014-01-29

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