EP0806518A1 - Device for kneading high consistency pulp - Google Patents

Device for kneading high consistency pulp Download PDF

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Publication number
EP0806518A1
EP0806518A1 EP97104827A EP97104827A EP0806518A1 EP 0806518 A1 EP0806518 A1 EP 0806518A1 EP 97104827 A EP97104827 A EP 97104827A EP 97104827 A EP97104827 A EP 97104827A EP 0806518 A1 EP0806518 A1 EP 0806518A1
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EP
European Patent Office
Prior art keywords
teeth
kneading
kneading device
angle
fibrous material
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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.)
Granted
Application number
EP97104827A
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German (de)
French (fr)
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EP0806518B1 (en
Inventor
Ulrich Wieland
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Voith Paper Fiber and Environmental Solutions GmbH and Co KG
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Voith Sulzer Stoffaufbereitung GmbH
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Publication of EP0806518A1 publication Critical patent/EP0806518A1/en
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21BFIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00Fibrous raw materials or their mechanical treatment
    • D21B1/04Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30Defibrating by other means
    • D21B1/34Kneading or mixing; Pulpers
    • D21B1/342Mixing apparatus

Definitions

  • the invention relates to a device for kneading highly consistent fibrous material according to the preamble of claim 1.
  • a kneading device is e.g. B. known from DE-42 37 433 A1.
  • This device which is suitable for kneading waste paper, serves to process the material intensively mechanically and possibly also thermally, as a result of which the impurities contained therein can be detached from the fibers, crushed and / or brought below the visibility limit.
  • the fiber be it pulp or waste paper, can be processed in such a way that it curls. This gives it specific improvements, such as a larger volume.
  • the raw material intended for the kneading process already has a pasty or soft-crumbly shape, so it is no longer comparable to wood chips or coarser materials. Other than z.
  • the pulp in pulp refiners in such machines, the pulp is not processed in a pumpable suspension, but just as a high consistency, preferably with a dry content between 15 and 40%. In this way, considerable shear forces can be transmitted into the fiber material, whereby the stated goals can be achieved without a substantial change in the fiber length.
  • the effect of mechanical treatment is further enhanced by heat, for example by setting a fiber temperature of 90 o Celsius or even higher.
  • the material In the kneader, the material usually remains in the processing rooms for 15 seconds to several minutes and, due to the distance of more than 3 mm between the tools, is mainly processed by fiber-fiber friction. As is known, this protects the fiber and the processing tools become slow worn.
  • the basic structure of the kneader is almost always recognizable as in the example of DE-42 37 433 A1: the rotor is essentially cylindrical and the material is conveyed axially between standing and moving kneading teeth.
  • Such kneaders have long proven themselves, especially for the use of waste paper.
  • the transport of the material through the processing zone is usually secured both by tilting the processing teeth and by a suitable conveyor, which is designed, for example, as a helical screw on the kneader shaft.
  • the funding parameters are practically fixed.
  • the invention is therefore based on the object of providing a device for kneading highly consistent fibrous material which offers the possibility of changing the transport movement in the processing zone without any appreciable additional outlay.
  • the front of the teeth of such a kneading tool moves relatively towards the fiber. Since the bevel on the front causes the material to be transported to be pushed and deflected in the transport direction, the material transport is supported in the kneader. The prerequisite for this is the relative movement between the bevel and the fibrous material, which can either result from the fact that the tooth in question belongs to the moving kneading tool or from the fact that a fixed tooth is flown against by a material moving in the circumferential direction. In the device equipped according to the invention, there is now the possibility, by simply turning a tooth or a group of teeth of one or more kneading tools, to bring the surface of the tooth previously used as the back to the front.
  • the transport effect depends on the angle that the bevel makes with respect to the direction of movement of the tooth or the material on the unmoved tooth, a different transport effect can also be achieved by turning such a tooth, for example by 180 °, at different angles of the bevel.
  • the incline can even be selected so that it slows down the mass transport.
  • a throughput through the machine would still have to be forced by an upstream or downstream transport device.
  • Figure 1a shows in a developed form the view of the part of a movable kneading tool 1, which belongs to a kneader with an axial flow of material.
  • a row of teeth with a number of teeth 2.
  • Cut 2 indicates the teeth 2 'of a fixed kneading tool.
  • the teeth 2, 2 ' are chamfered on both the front and the back.
  • all teeth have an essentially identical shape, but this need not always be the case (see also FIG. 3). Because of their arrangement in the kneading device, the teeth 2 are moved in the circumferential direction (arrow 3) during operation.
  • a plane E is spanned here, shown in section.
  • the direction of transport T of the fibrous material is perpendicular to this plane E. Only the actual material transport through the kneader is considered. Of course, there is generally also a circumferential movement of the fibrous material.
  • the angles that the bevels have in relation to the transport direction T are specified with angle ⁇ 1 on the front and angle ⁇ 2 on the back - in each case in the position before the tooth is turned.
  • Fig. 1 b shows the parts of Fig. 1 a after turning the teeth 2 and 2 'by 180 o .
  • the transport effect on the front of the teeth is less because of the lower inclination.
  • these tooth surfaces can also be curved.
  • the decisive factor is their transport effect.
  • FIG. 2 shows a somewhat different attachment of the teeth 2 belonging to the device according to the invention.
  • the part of a bar 4 intended for an axial machine, which contains several teeth 2, which then belong to different rows of teeth of this kneading tool, can be seen.
  • the teeth can be turned by turning this bar 4.
  • Such a strip can belong to the rotor or stator, on which it is fastened in an essentially axially aligned manner along its length.
  • Figure 3 shows in section an axially constructed kneading device, in which the transport movement of the fibrous material also takes place axially again.
  • the representation is roughly schematic and contains, for example, only a small part of the teeth actually present.
  • the Fibrous material S is pressed into the actual processing zone upon entry by a screw conveyor 5.
  • the teeth 2, 2 'of which are arranged alternately on the rotor 6 or on the stator housing 7.
  • the teeth 2 'belonging to the stator housing 7 are shown cut. Some of them have a varied, strongly rounded shape, others are cubic but without bevels.
  • the tooth base normals N are indicated, the circumferential movement of which spans the plane E (FIGS.
  • the last stator stage in the flow direction is followed here by an adjustable throttle 8 to achieve a counter pressure.
  • the effect of the kneading device can be further improved by this measure. After passing the throttle 8, the kneaded substance S 'emerges from the stator housing 7 again.
  • Fig. 4 shows the part of a kneading tool that belongs to a radial kneader.
  • the material transport with the transport direction T thus takes place radially outwards from the inside.
  • a cylindrical surface F is spanned by the circumferential movement (arrow 3) of the tooth base normal N 'of the teeth 2.
  • the holes 9 are provided for fastening screws.
  • the tooth 2 'belonging to the stator is only indicated. Deviating from the example shown here, the shape of the teeth 2 can be quite different.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Paper (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

An apparatus for working highly consolidated fibre pulp has at least two kneading tools (1, 1') which move relative one to another, are symmetrical about a common axis of rotation and have rows of teeth (2, 2') and inter-tooth gaps arranged in ring-shapes. At least one row of one kneading tool projects into at least one empty annular space between rows in the other. At least some of the teeth have a leading side which is bevelled to cause the pulp to be deflected, due to relative movement between pulp and bevel, into the supply direction (T) resulting from passage of pulp through the apparatus. At least some teeth on the reverse side of the apparatus are likewise bevelled in such a way that the difference between the bevel angle ( alpha 1) on the leading face and that ( alpha 2) on the reverse is at least 5 degrees and at least some teeth can be loosened, turned and fixed again to interchange leading and reverse tooth sides.

Description

Die Erfindung betrifft eine Vorrichtung zum Kneten von hochkonsistentem Faserstoff gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for kneading highly consistent fibrous material according to the preamble of claim 1.

Eine Knetvorrichtung ist z. B. aus der DE-42 37 433 A1 bekannt. Diese zum Kneten von Altpapier geeignete Vorrichtung dient dazu, den Stoff intensiv mechanisch und eventuell auch thermisch zu bearbeiten, wodurch die darin enthaltenen Störstoffe von den Fasern abgelöst, zerkleinert und/oder unter die Sichtbarkeitsgrenze gebracht werden können. Es gibt auch andere Anwendungen derartiger Knetvorrichtungen. Z.B. kann darin die Faser, sei es Zellstoff oder Altpapier, so bearbeitet werden, daß sie sich kräuselt (curling). Dadurch erhält sie spezifische Verbesserungen, wie z.B. ein größeres Volumen. Der für den Knetvorgang bestimmte Ausgangsstoff hat bereits eine teigige oder weich-krümelige Form, ist also nicht mehr mit Holz-Hackschnitzeln oder noch gröberen Stoffen vergleichbar. Anders auch als z. B. bei Papierstoff-Mahlrefinern wird bei derartigen Maschinen der Faserstoff nicht in einer pumpfähigen Suspension bearbeitet, sondern eben als Hochkonsistenzstoff, vorzugsweise mit einem Trockengehalt zwischen 15 und 40 %. Auf diese Weise lassen sich beträchtliche Scherkräfte in den Faserstoff übertragen, wodurch die genannten Ziele erreichbar sind, ohne daß dabei eine wesentliche Veränderung der Faserlänge erfolgt. In vielen Fällen wird die Wirkung der mechanischen Behandlung durch Hitze weiter verstärkt, z.B. durch Einstellen einer Faserstofftemperatur von 90o Celsius oder noch darüber.A kneading device is e.g. B. known from DE-42 37 433 A1. This device, which is suitable for kneading waste paper, serves to process the material intensively mechanically and possibly also thermally, as a result of which the impurities contained therein can be detached from the fibers, crushed and / or brought below the visibility limit. There are other applications of such kneaders. For example, the fiber, be it pulp or waste paper, can be processed in such a way that it curls. This gives it specific improvements, such as a larger volume. The raw material intended for the kneading process already has a pasty or soft-crumbly shape, so it is no longer comparable to wood chips or coarser materials. Other than z. B. in pulp refiners in such machines, the pulp is not processed in a pumpable suspension, but just as a high consistency, preferably with a dry content between 15 and 40%. In this way, considerable shear forces can be transmitted into the fiber material, whereby the stated goals can be achieved without a substantial change in the fiber length. In many cases, the effect of mechanical treatment is further enhanced by heat, for example by setting a fiber temperature of 90 o Celsius or even higher.

Beim Kneter verbleibt der Stoff in der Regel 15 Sekunden bis zu mehreren Minuten in den Bearbeitungsräumen und wird infolge des Abstandes von mehr als 3 mm zwischen den Werkzeugen überwiegend durch Faser-Faser-Reibung bearbeitet. Bekanntlich wird dadurch die Faser geschont und werden die Bearbeitungswerkzeuge nur langsam verschlissen. Der Grundaufbau des Kneters ist fast immer wie am Beispiel der DE-42 37 433 A1 erkennbar: Der Rotor ist im wesentlichen zylindrisch, und der Stoff wird axial zwischen stehenden und bewegten Knetzähnen hindurchgefördert. Solche Kneter haben sich besonders für den Altpapiereinsatz seit langem bewährt. Der Transport des Stoffes durch die Bearbeitungszone wird dabei meist sowohl durch Schrägstellung der Bearbeitungszähne als auch durch eine geeignete Fördereinrichtung gesichert, die z.B. als Schneckenwendel auf der Kneterwelle ausgebildet ist. Die Förderparameter liegen damit praktisch fest.In the kneader, the material usually remains in the processing rooms for 15 seconds to several minutes and, due to the distance of more than 3 mm between the tools, is mainly processed by fiber-fiber friction. As is known, this protects the fiber and the processing tools become slow worn. The basic structure of the kneader is almost always recognizable as in the example of DE-42 37 433 A1: the rotor is essentially cylindrical and the material is conveyed axially between standing and moving kneading teeth. Such kneaders have long proven themselves, especially for the use of waste paper. The transport of the material through the processing zone is usually secured both by tilting the processing teeth and by a suitable conveyor, which is designed, for example, as a helical screw on the kneader shaft. The funding parameters are practically fixed.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zum Kneten von hochkonsistentem Faserstoff zu schaffen, die ohne nennenswerten Mehraufwand eine Änderungsmöglichkeit der Transportbewegung in der Bearbeitungszone bietet.The invention is therefore based on the object of providing a device for kneading highly consistent fibrous material which offers the possibility of changing the transport movement in the processing zone without any appreciable additional outlay.

Diese Aufgabe wird durch die im Kennzeichen des Anspruchs 1 genannten Merkmale vollständig gelöst.This object is completely achieved by the features mentioned in the characterizing part of claim 1.

Die Vorderseite der Zähne eines solchen Knetwerkzeuges bewegt sich relativ auf den Faserstoff zu. Da die an der Vorderseite vorhandene Schräge eine Schiebe- und Umlenkbewegung des zu transportierenden Stoffes in die Transportrichtung bewirkt, findet eine Unterstützung des Stofftransportes im Kneter statt. Voraussetzung hierfür ist die Relativbewegung zwischen der Schräge und dem Faserstoff, die entweder dadurch entstehen kann, daß der betreffende Zahn zum bewegten Knetwerkzeug gehört oder dadurch, daß ein feststehender Zahn von einem in Umfangsrichtung bewegten Stoff angeströmt wird. Bei der erfindungsgemäß ausgestatteten Vorrichtung besteht nunmehr die Möglichkeit, durch einfaches Wenden eines Zahnes oder einer Gruppe von Zähnen eines oder mehrerer Knetwerkzeuge die bisher als Rückseite verwendete Fläche des Zahnes auf die Vorderseite zu bringen. Da die Transportwirkung von dem Winkel abhängt, den die Schräge gegenüber der Bewegungsrichtung des Zahnes oder des Stoffes am unbewegten Zahn einnimmt, kann durch Wenden eines solchen Zahnes, z.B. um 180o bei unterschiedlichen Winkeln der Schrägen auch eine unterschiedliche Transportwirkung erzielt werden.The front of the teeth of such a kneading tool moves relatively towards the fiber. Since the bevel on the front causes the material to be transported to be pushed and deflected in the transport direction, the material transport is supported in the kneader. The prerequisite for this is the relative movement between the bevel and the fibrous material, which can either result from the fact that the tooth in question belongs to the moving kneading tool or from the fact that a fixed tooth is flown against by a material moving in the circumferential direction. In the device equipped according to the invention, there is now the possibility, by simply turning a tooth or a group of teeth of one or more kneading tools, to bring the surface of the tooth previously used as the back to the front. Since the transport effect depends on the angle that the bevel makes with respect to the direction of movement of the tooth or the material on the unmoved tooth, a different transport effect can also be achieved by turning such a tooth, for example by 180 °, at different angles of the bevel.

Das Wenden in der beschriebenen Form führt also auf einfache Art und Weise zu einem Ändern der Förderwirkung an dem betreffenden Zahn. Eine solche Änderung kann Vorteile bringen, wenn bei der Auslegung der Maschine Bedingungen berücksichtigt werden sollen, die nicht dem ursprünglichen Standard entsprechen. Das kann z.B. die Erfordernis eines größeren oder kleineren Durchsatzes sein. Weiterbin kann es von Vorteil sein, gezielt auf die Transportvorgänge derart Einfluß zu nehmen, daß in bestimmten Teilen der Bearbeitungszonen eine höhere Transportgeschwindigkeit und in anderen Teilen eine geringere Transportgeschwindigkeit herrschen soll. Dadurch würde eine Kompressionszone entstehen, durch die der Stoff zwangsweise hindurchtritt. Eine Kompressionszone kann z.B. als Dampfsperre dienen. Aber auch technologische Vorteile beim eigentlichen Knetvorgang sind hierdurch erzielbar. Eine Einflußnahme dieser Art auf den Stofftransport im Kneter kann aber durchaus für verschiedene Einsatzfälle ein und desselben Kneters unterschiedlich gewünscht werden. In einem solchen Falle muß zur Anpassung erfindungsgemäß lediglich ein Teil der oder alle entsprechend ausgestatteten Zähne gewendet werden. Selbst in den Fällen, in denen ursprünlich die Schrägen an der Vorder- und Rückseite gleich sind, kann durch Wenden eine weniger verschlissene Fläche zum Transport des Stoffes angeboten werden.Turning in the form described thus leads in a simple manner to a change in the conveying effect on the tooth in question. Such a change can be advantageous if the design of the machine takes into account conditions that do not correspond to the original standard. This can e.g. the need for larger or smaller throughput. It can also be advantageous to influence the transport processes in such a way that a higher transport speed should prevail in certain parts of the processing zones and a lower transport speed should prevail in other parts. This would create a compression zone through which the fabric will forcibly pass. A compression zone can e.g. serve as a vapor barrier. However, technological advantages in the actual kneading process can also be achieved in this way. An influence of this type on the mass transport in the kneader can, however, be desired differently for different applications of the same kneader. In such a case, according to the invention, only a part or all of the appropriately equipped teeth have to be turned for adaptation. Even in cases where the slants on the front and back are originally the same, a less worn surface for transporting the fabric can be offered by turning.

In bestimmten Extremfällen, bei denen eine ausgeprägte Kompression des Stoffes zonenweise gewünscht wird, kann die Schräge sogar so gewählt werden, daß sie den Stofftransport bremst. Natürlich würde durch eine vor- oder nachgelagerte Transporteinrichtung dennoch ein Durchsatz durch die Maschine erzwungen werden müssen.In certain extreme cases, where a pronounced compression of the material is desired zone by zone, the incline can even be selected so that it slows down the mass transport. Of course, a throughput through the machine would still have to be forced by an upstream or downstream transport device.

Die Erfindung und ihre Vorteile werden erläutert anhand von Zeichnungen. Dabei zeigen:

Figur 1a+1b
einen Teil einer erfindungsgemäß ausgeführten Knetvorrichtung;
Figur 2
Variante zur Zahnbefestigung;
Figur 3
Axialmaschine, geschnitten, Seitenansicht;
Figur 4
Knetvorrichtung für eine Radialmaschine.
The invention and its advantages are explained with reference to drawings. Show:
Figure 1a + 1b
part of a kneading device designed according to the invention;
Figure 2
Variant for tooth attachment;
Figure 3
Axial machine, cut, side view;
Figure 4
Kneading device for a radial machine.

Figur 1a zeigt in abgewickelter Form die Aufsicht auf den Teil eines bewegbaren Knetwerkzeuges 1, welches zu einem Kneter mit axialem Stofffluß gehört. Man erkennt eine Zahnreihe mit einer Anzahl von Zähnen 2. Geschnitten angedeutet sind die Zähne 2' eines feststehenden Knetwerkzeuges. Die Zähne 2, 2' sind sowohl auf der Vorderseite als auch auf der Rückseite abgeschrägt. Dabei haben in dem hier gezeigten Beispiel alle Zähne eine im wesentlichen gleiche Form, was aber nicht immer so sein muß (s. auch Fig. 3). Aufgrund ihrer Anordnung in der Knetvorrichtung werden die Zähne 2 bei Betrieb in Umfangsrichtung (Pfeil 3) bewegt. Bei einer solchen Bewegung der Zahnfußnormalen N wird hier eine Ebene E aufgespannt, im Schnitt dargestellt. Die Transportrichtung T des Faserstoffes steht senkrecht auf dieser Ebene E. Dabei wird nur der eigentliche Stofftransport durch den Kneter hindurch betrachtet, selbstverständlich findet in der Regel außerdem eine Umfangsbewegung des Faserstoffes statt. Die Winkel, die die Schrägen gegenüber der Transportrichtung T haben, sind mit Winkel α 1 an der Vorderseite und Winkel α 2 an der Rückseite - jeweils in der Stellung vor dem Wenden des Zahnes - angegeben.Figure 1a shows in a developed form the view of the part of a movable kneading tool 1, which belongs to a kneader with an axial flow of material. One can see a row of teeth with a number of teeth 2. Cut 2 indicates the teeth 2 'of a fixed kneading tool. The teeth 2, 2 'are chamfered on both the front and the back. In the example shown here, all teeth have an essentially identical shape, but this need not always be the case (see also FIG. 3). Because of their arrangement in the kneading device, the teeth 2 are moved in the circumferential direction (arrow 3) during operation. With such a movement of the tooth base normals N, a plane E is spanned here, shown in section. The direction of transport T of the fibrous material is perpendicular to this plane E. Only the actual material transport through the kneader is considered. Of course, there is generally also a circumferential movement of the fibrous material. The angles that the bevels have in relation to the transport direction T are specified with angle α 1 on the front and angle α 2 on the back - in each case in the position before the tooth is turned.

Fig. 1 b stellt die Teile der Fig. 1 a nach dem Wenden der Zähne 2 und 2' um 180o dar. Die Transportwirkung an der Vorderseite der Zähne ist wegen der geringeren Schrägstellung geringer. Selbstverständlich könne diese Zahnflächen auch gewölbt sein. Entscheidend ist ihre Transportwirkung.Fig. 1 b shows the parts of Fig. 1 a after turning the teeth 2 and 2 'by 180 o . The transport effect on the front of the teeth is less because of the lower inclination. Of course, these tooth surfaces can also be curved. The decisive factor is their transport effect.

Figur 2 zeigt eine etwas andere Befestigung von den zur erfindungsgemäßen Vorrichtung gehörenden Zähnen 2. Man erkennt den Teil einer für eine Axialmaschine bestimmte Leiste 4, welche mehrere Zähne 2 enthält, die dann zu jeweils verschiedenen Zahnreihen dieses Knetwerkzeuges gehören. Hier kann das Wenden der Zähne durch Wenden dieser Leiste 4 erfolgen. Eine solche Leiste kann zum Rotor oder Stator gehören, auf dem sie ihrer Länge nach im wesentlichen axial ausgerichtet befestigt ist.FIG. 2 shows a somewhat different attachment of the teeth 2 belonging to the device according to the invention. The part of a bar 4 intended for an axial machine, which contains several teeth 2, which then belong to different rows of teeth of this kneading tool, can be seen. Here the teeth can be turned by turning this bar 4. Such a strip can belong to the rotor or stator, on which it is fastened in an essentially axially aligned manner along its length.

Figur 3 zeigt im Schnitt eine axial aufgebaute Knetvorrichtung, bei der also die Transportbewegung des Faserstoffes auch wieder axial erfolgt. Die Darstellung ist grob schematisch und enthält z.B. nur einen geringen Teil der real vorhandenen Zähne. Der Faserstoff S wird beim Eintrag durch eine Förderschnecke 5 in die eigentliche Bearbeitungszone gepreßt. In dieser befinden sich mehrere Zahnreihen, deren Zähne 2, 2' alternierend angeordnet am Rotor 6 oder am Statorgehäuse 7 befestigt sind. Dabei sind die zum Statorgehäuse 7 gehörenden Zähne 2' geschnitten gezeichnet. Ein Teil von ihnen hat hier eine variierte, stark abgerundete Form, ein anderer Teil ist kubisch aber ohne Anschrägungen. An einigen von der Seite sichtbaren Zähnen sind die Zahnfußnormalen N angedeutet, deren Umfangsbewegung die Ebene E (Fig. 1 a, 1 b) aufspannt. Der in Strömungsrichtung letzten Statorstufe folgt hier eine einstellbare Drossel 8 zur Erzielung eines Gegendruckes. Durch diese Maßnahme kann die Wirkung der Knetvorrichtung weiter verbessert werden. Nach Passieren der Drossel 8 tritt der geknetete Stoff S' aus dem Statorgehäuse 7 wieder aus.Figure 3 shows in section an axially constructed kneading device, in which the transport movement of the fibrous material also takes place axially again. The representation is roughly schematic and contains, for example, only a small part of the teeth actually present. Of the Fibrous material S is pressed into the actual processing zone upon entry by a screw conveyor 5. In this there are several rows of teeth, the teeth 2, 2 'of which are arranged alternately on the rotor 6 or on the stator housing 7. The teeth 2 'belonging to the stator housing 7 are shown cut. Some of them have a varied, strongly rounded shape, others are cubic but without bevels. On some teeth visible from the side, the tooth base normals N are indicated, the circumferential movement of which spans the plane E (FIGS. 1 a, 1 b). The last stator stage in the flow direction is followed here by an adjustable throttle 8 to achieve a counter pressure. The effect of the kneading device can be further improved by this measure. After passing the throttle 8, the kneaded substance S 'emerges from the stator housing 7 again.

Fig. 4 zeigt den Teil eines Knetwerkzeuges , das zu einem Radialkneter gehört. Der Stofftransport mit Transportrichtung T erfolgt also von innen radial nach außen. Durch die Umfangsbewegung (Pfeil 3) der Zahnfußnormalen N' der Zähne 2 wird eine zylindrische Fläche F aufgespannt. Zum Wenden der Zähne 2 werden diese einzeln gelöst; die Löcher 9 sind für Befestigungsschrauben vorgesehen. Der zum Stator gehörende Zahn 2' ist nur angedeutet. Abweichend vom hier gezeigten Beispiel kann er sich in seiner Form von den bewegten Zähnen 2 durchaus unterscheiden. Es ist bei Realisierung der Erfindung auch möglich, die zum Wenden eingerichteten Zähne nur am Rotor oder nur am Stator vorzusehen.Fig. 4 shows the part of a kneading tool that belongs to a radial kneader. The material transport with the transport direction T thus takes place radially outwards from the inside. A cylindrical surface F is spanned by the circumferential movement (arrow 3) of the tooth base normal N 'of the teeth 2. To turn the teeth 2, they are loosened individually; the holes 9 are provided for fastening screws. The tooth 2 'belonging to the stator is only indicated. Deviating from the example shown here, the shape of the teeth 2 can be quite different. When realizing the invention, it is also possible to provide the teeth set for turning only on the rotor or only on the stator.

Claims (10)

Knetvorrichtung für hochkonsistenten Faserstoff (S) mit mindestens zwei relativ zueinander bewegbaren, im wesentlichen rotationssymmetrischen koaxialen Knetwerkzeugen (1, 1'), die in ringförmigen Zahnreihen angeordnete Zähne (2, 2') aufweisen, zwischen denen sich Zahnlücken befinden, wobei zwischen den Zahnreihen ringförmige Leerräume vorhanden sind, die so zueinander positioniert sind, daß mindestens eine Zahnreihe eines Knetwerkzeuges (1, 1') in einen ringförmigen Leerraum eines anderen Knetwerkzeuges (1', 1) hineinreicht, wobei zumindest an einem Teil der Zähne (2, 2') die Vorderseite eine Schräge aufweist, an der der Faserstoff durch Relativbewegung zwischen dem Faserstoff und der die Vorderseite bildenden Fläche in Förderrichtung (T) umgelenkt wird, wobei die Förderrichtung (T) aus dem Durchsatz des Faserstoffes durch die Knetvorrichtung resultiert,
dadurch gekennzeichnet,
daß zumindest ein Teil der Zähne (2, 2') an der Rückseite ebenfalls Schrägen enthält, daß sich der Winkel (α 1) der Schräge auf der Vorderseite von dem Winkel (α 2) der Rückseite um mindestens 5o unterscheidet und daß zumindest ein Teil der Zähne (2, 2') lösbar derart befestigt sind, daß durch Wenden der Zähne (2, 2') die Position von Vorderseite und Rückseite tauschbar ist.
Kneading device for highly consistent fibrous material (S) with at least two coaxially kneading tools (1, 1 ') which can be moved relative to one another and are essentially rotationally symmetrical and which have teeth (2, 2') arranged in annular rows of teeth, between which there are tooth gaps, between the rows of teeth there are annular empty spaces which are positioned in relation to one another such that at least one row of teeth of a kneading tool (1, 1 ') extends into an annular empty space of another kneading tool (1', 1), at least on some of the teeth (2, 2 ' ) the front side has a slope at which the fibrous material is deflected in the conveying direction (T) by relative movement between the fibrous material and the surface forming the front side, the conveying direction (T) resulting from the throughput of the fibrous material through the kneading device,
characterized,
that at least some of the teeth (2, 2 ') on the back also contain bevels, that the angle (α 1) of the bevel on the front differs from the angle (α 2) on the back by at least 5 o and that at least one Part of the teeth (2, 2 ') are releasably attached such that the position of the front and back can be exchanged by turning the teeth (2, 2').
Knetvorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß das Wenden des Zahnes (2, 2') in einem Winkel von 180o erfolgt.
Kneading device according to claim 1,
characterized,
that the turning of the tooth (2, 2 ') takes place at an angle of 180 o .
Knetvorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß sich der Winkel (α 1) der Schräge auf der Vorderseite von dem Winkel (α 2) der Rückseite um mindestens 15o unterscheidet.
Kneading device according to claim 1 or 2,
characterized,
that the angle (α 1) of the slope on the front differs from the angle (α 2) on the back by at least 15 o .
Knetvorrichtung nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet,
daß die Förderrichtung (T) des Faserstoffes rechtwinkelig zur durch die Bewegung der Zähne aufgespannten Fläche (E, F) ist.
Kneading device according to claim 1, 2 or 3,
characterized,
that the conveying direction (T) of the fibrous material is perpendicular to the surface (E, F) spanned by the movement of the teeth.
Knetvorrichtung nach Anspruch 4,
dadurch gekennzeichnet,
daß die Förderrichtung (T) in Achsrichtung der Knetwerkzeuge liegt.
Kneading device according to claim 4,
characterized,
that the conveying direction (T) lies in the axial direction of the kneading tools.
Knetvorrichtung nach Anspruch 4,
dadurch gekennzeichnet,
daß die Förderrichtung (T) radial ist mit Zentrum in der Mittelachse der Knetwerkzeuge (1, 1').
Kneading device according to claim 4,
characterized,
that the conveying direction (T) is radial with a center in the central axis of the kneading tools (1, 1 ').
Knetvorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß mehrere Zähne (2, 2') eines Knetwerkzeuges (1, 1') auf einem wendbaren Garnitursegment zusammengefaßt sind.
Kneading device according to one of the preceding claims,
characterized,
that several teeth (2, 2 ') of a kneading tool (1, 1') are combined on a reversible clothing segment.
Knetvorrichtung nach Anspruch 6 und 7,
dadurch gekennzeichnet,
daß das Garnitursegment einen geschlossenen Ring enthält.
Kneading device according to claim 6 and 7,
characterized,
that the clothing segment contains a closed ring.
Knetvorrichtung nach Anspruch 8,
dadurch gekennzeichnet,
daß das Garnitursegment ein Ringsegment enthält, das sich über einen Umfangswinkel von höchstens 180o erstreckt.
Kneading device according to claim 8,
characterized,
that the clothing segment contains a ring segment that extends over a circumferential angle of at most 180 o .
Knetvorrichtung nach Anspruch 6 und 7,
dadurch gekennzeichnet,
daß das Garnitursegment Leisten (4) enthält, die axial auf dem Knetwerkzeug (1, 1') befestigt sind und jeweils zu mehreren Zahnreihen gehörende Zähne (2) tragen.
Kneading device according to claim 6 and 7,
characterized,
that the clothing segment contains strips (4) which are axially on the kneading tool (1, 1 ') are fastened and each carry teeth (2) belonging to several rows of teeth.
EP97104827A 1996-05-10 1997-03-21 Device for kneading high consistency pulp Expired - Lifetime EP0806518B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19618886 1996-05-10
DE19618886 1996-05-10

Publications (2)

Publication Number Publication Date
EP0806518A1 true EP0806518A1 (en) 1997-11-12
EP0806518B1 EP0806518B1 (en) 2001-06-27

Family

ID=7793965

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EP97104827A Expired - Lifetime EP0806518B1 (en) 1996-05-10 1997-03-21 Device for kneading high consistency pulp

Country Status (5)

Country Link
US (1) US5836689A (en)
EP (1) EP0806518B1 (en)
AT (1) ATE202603T1 (en)
DE (1) DE59703888D1 (en)
NO (1) NO310307B1 (en)

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EP1247454A1 (en) * 2000-11-13 2002-10-09 MORINAGA & CO., LTD. Kneading device and forming device

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CN101725065B (en) * 2009-12-01 2011-09-07 沈阳市宏芮化学品厂 Ruminant-type high-concentration pulper
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DE102021119250B3 (en) * 2021-07-26 2022-07-28 Voith Patent Gmbh Device for dissolving pulp

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Also Published As

Publication number Publication date
NO971738L (en) 1997-11-11
ATE202603T1 (en) 2001-07-15
EP0806518B1 (en) 2001-06-27
NO310307B1 (en) 2001-06-18
DE59703888D1 (en) 2001-08-02
US5836689A (en) 1998-11-17
NO971738D0 (en) 1997-04-16

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