EP1693505B1 - Pulper for disintegration and suspension of paper pulp and rotor suitable for such a pulper - Google Patents

Pulper for disintegration and suspension of paper pulp and rotor suitable for such a pulper Download PDF

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Publication number
EP1693505B1
EP1693505B1 EP06000661A EP06000661A EP1693505B1 EP 1693505 B1 EP1693505 B1 EP 1693505B1 EP 06000661 A EP06000661 A EP 06000661A EP 06000661 A EP06000661 A EP 06000661A EP 1693505 B1 EP1693505 B1 EP 1693505B1
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EP
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Prior art keywords
rotor
pulper
blades
pulper according
screen
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EP06000661A
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German (de)
French (fr)
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EP1693505A1 (en
Inventor
Gerhard Gaus
Axel Gommel
Tillman Katzenmeier
Wolfgang Müller
Andreas Steidele
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Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers

Definitions

  • the invention relates to a pulper for comminution and suspension of pulp and rotor for such a pulper.
  • Pulpers of this type are mainly used to suspend dried pulp or waste paper. They consist essentially of a container for the suspension and at least one rotor. The registered material is intensively mixed in large pieces, webs or pressed bales with water, whereby a hydraulic material drive is generated by the rotor. Understandably, such devices are optimized, aiming essentially for a fast and efficient dissolution. In many cases, the rotor is placed in close proximity to a flat screen that keeps it free of blockages. Through the openings of the screen, the dissolved substance is withdrawn as a suspension.
  • the standard type for a pulper is a vertical cylindrical container with a rotor in the bottom area.
  • water and the substance to be dissolved is added from above and with the help of the rotor creates a Trombenströmung in the suspension, ie in the inner region of the fabric is pulled down from the rotor and pressed radially outwards in the bottom region, resulting in a Umtriebsströmung results.
  • the circumferential flow braked is also known to control this Umtriebsströmung.
  • Another typical design is the open top pulper with laterally inserted rotor.
  • the invention is based on the object to improve pulpers for crushing and suspending paper stock so that the dissolution process can be carried out more economically and gently.
  • an improved deflaking effect can be achieved.
  • the working strips at the top of the wings are suitable for intensifying the dissolving effect.
  • This feature may also be combined with the known dissolution ledges or protrusions attached to the sieve facing side of the rotor can be located. In this area, ie in the space between the rotor and sieve, there is also an intensive processing of the pulp by shear forces, provided that it is fine enough to get there. Further advantages are possible in that the blades of the rotor are strongly curved and form a relatively acute angle with the peripheral circle at its outer radius. In particular, if a flat dissolving container is used with laterally attached rotor, it can be generated with this measure a low-spin flow.
  • the wear protection can be improved by providing the front sides of the wings or the working strips with replaceable wear-resistant plates or strips. It is also conceivable to design the working strips in total as replaceable wear parts.
  • FIG. 1 shows the top view of a rotor for a pulper according to the invention. Even if such a rotor in the pulper is not always horizontal, that is operated with a vertical axis, it is assumed here of this special installation situation and accordingly spoken of "top” and "bottom".
  • the rotor 2 is provided with a total of five curved wings 3 and is driven in rotation in the direction of rotation 6 during operation of the pulper. One of the wings is shown below the task bar 7 cut.
  • the rotor acts with a sieve 10 together, of which only a small part is drawn here. This sieve 10 is mounted at a distance A to the bottom of the rotor (see Fig. 2 ).
  • the smallest distance A is as small as possible, so that a good resolution is achieved and thus the rotor or its wings 3 can serve to keep the screen openings 11 free. It lies with advantage with few millimeters. If the sieve is provided with strips on the side facing the rotor, which advantageously enhances the dissolving effect, the distance A is to be measured from the upper side of the strip.
  • working strips 7 are mounted, which project in the direction of rotation 6 and e.g. can have a rectangular cross-section.
  • their upper side 16 and / or lower side 15, at least predominantly aligned perpendicular to the rotor axis.
  • Its axial extent B is advantageously relatively small compared to the axial extent of the wings 3, e.g. between 5 and 20%.
  • Thre working edges can be smooth or with a serrated profile.
  • the blades 3 of the rotor have on its front side, ie the side which drives the suspension during rotation, below the working strips 7, a front surface 4 whose projection on the wire 11 the circumferential circle 5 intersects at an angle ⁇ of at most 20 °.
  • this angle ⁇ is relatively acute and has a special hydraulic effect when driving the suspension in the pulper because of the pronounced radial conveying action.
  • Fig. 1 is entered the line II, along which a cut is laid and in Fig. 2 is shown.
  • This section through the wing 3, the hub body 9 of the rotor and the screen 10 shows in particular the distance A between the underside of the rotor and the top of the screen 10.
  • a rounding 13 between working strips 7 and leading edges of the wings 3 in the radially outer region of the rotor visible (here as exhibit. It can also be seen that in the example shown here, the hub body 9 of the rotor is fastened releasably on a shaft flange 12 by means of screws 14.
  • Fig. 3 is a section according to the line III ( Fig. 1 ) visible, noticeable. Also at this point, a part of the task bar 7 can be seen, which, however, followed by only a small rounding on the front surface 4 of the wing 3.
  • the surface 4 is parallel to a plane perpendicular to the wire, that is not inclined relative to the axial direction of the rotor 2 or inclined at an inclination angle y, wherein this inclination angle ⁇ is advantageously between 15 and 30 °. Since this inclination is directed so that the parts of the surface 4 further away from the screen project in the direction of rotation, a flow component is produced in the direction of the screen, which in many cases improves the resolving action of the rotor.
  • a pulper to which the invention can be applied is the standing cylindrical open top pulper according to FIG Fig. 4 in which sieve 10 and rotor 2 are located in the bottom area.
  • the rotor 2 has an axial extent E which is between 10% and 20% of the diameter of the circumferential circle 5.
  • the pulper is then particularly suitable for consistencies between 2 and 6%.
  • pulp S and water W are introduced into the container 1 of the pulper.
  • the finished pumpable suspension is withdrawn through the screen openings of the screen 10 as accept G.
  • Another likewise advantageous embodiment of the invention is a pulper with at least one laterally mounted rotor according to Fig. 5 with a horizontal container 1 '.
  • a lying container can be used, for example, under a paper machine for the dissolution of production scrap. Due to the hydraulically less favorable shape of a horizontal container 1 ', however, the requirements for the rotor are particularly high. As a further application is also a Sekundärstofflöser eg according to DE-A-2345735 conceivable, which is provided with a rotor described in the claims.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

Pulp beater comprises a vessel for receiving pulp and water, a blade-bearing rotor mounted in the vessel, and a screen (10) whose surface is swept by the rotor. The rotor blades (3) are curved so that the angle (alpha ) between the tip of the leading edge (4) and the circumference (5) of the blade path is no more than 20[deg] and the blades are fitted on top with forward-projecting guide facings (7) that intersect the circumference at an angle (beta ) of at least 40[deg]. An independent claim is also included for a pulp beater rotor as above.

Description

Die Erfindung betrifft einen Stofflöser zur Zerkleinerung und Suspendierung von Papierstoff sowie Rotor für einen solchen Stofflöser.The invention relates to a pulper for comminution and suspension of pulp and rotor for such a pulper.

Stofflöser dieser Art werden hauptsächlich angewendet, um getrocknetes Zellstoffmaterial oder Altpapier in Suspension zu bringen. Sie bestehen im Wesentlichen aus einem Behälter für die Suspension und mindestens einem Rotor. Das eingetragene Material wird in großen Stücken, Bahnen oder gepressten Ballen mit Wasser intensiv vermischt, wobei durch den Rotor ein hydraulischer Stoffumtrieb erzeugt wird. Verständlicherweise werden solche Vorrichtungen optimiert, wobei im Wesentlichen eine schnelle und kraftwirtschaftliche Auflösung angestrebt wird. In vielen Fällen wird der Rotor in unmittelbarer Nähe eines ebenen Siebes angeordnet, das er frei von Verstopfungen hält. Durch die Öffnungen des Siebes wird der aufgelöste Stoff als Suspension abgezogen.Pulpers of this type are mainly used to suspend dried pulp or waste paper. They consist essentially of a container for the suspension and at least one rotor. The registered material is intensively mixed in large pieces, webs or pressed bales with water, whereby a hydraulic material drive is generated by the rotor. Understandably, such devices are optimized, aiming essentially for a fast and efficient dissolution. In many cases, the rotor is placed in close proximity to a flat screen that keeps it free of blockages. Through the openings of the screen, the dissolved substance is withdrawn as a suspension.

Als Standardtyp für einen Stofflöser hat sich ein senkrecht stehender zylindrischer Behälter mit einem Rotor im Bodenbereich durchgesetzt. In diesen Behälter wird Wasser und der aufzulösende Stoff von oben zugegeben und mit Hilfe des Rotors eine Trombenströmung in der Suspension erzeugt, bei der also im inneren Bereich der Stoff vom Rotor nach unten gezogen und im Bodenbereich radial nach außen gedrückt wird, wodurch sich eine Umtriebsströmung ergibt. Es sind auch Strömungsmaßnahmen bekannt, um diese Umtriebsströmung zu steuern. So wird z.B. durch entsprechende Strömungseinbauten (wie Wehrbleche oder Strömungsbrecher) an der Behälterwandung die Umfangsströmung gebremst, da sie nur einen geringen Beitrag zur Auflösung bringt. Eine weitere typische Bauart ist der oben offene Pulper mit seitlich eingesetztem Rotor. Dann wird die Suspension etwa waagerecht zum Rotor gefördert und an der den Rotor tragenden Seitenwand des Behälters umgelenkt. Diese hydraulisch oft weniger günstige Form hat den Vorteil, unter der Papiermaschine als Ausschussauflöser Platz zu finden. Die Förderung des eigentlichen Umtriebs, d.h. der wiederholte Transport des aufzulösenden Stoffes in den Rotorbereich bringt in der Regel eine Verbesserung des Effektes. Aus diesem Grund ist auch schon viel Entwicklung an den Rotoren und Behältern des Stofflösers betrieben worden.The standard type for a pulper is a vertical cylindrical container with a rotor in the bottom area. In this container, water and the substance to be dissolved is added from above and with the help of the rotor creates a Trombenströmung in the suspension, ie in the inner region of the fabric is pulled down from the rotor and pressed radially outwards in the bottom region, resulting in a Umtriebsströmung results. There are also flow measures known to control this Umtriebsströmung. Thus, for example, by appropriate flow installations (such as weir plates or flow breaker) on the container wall, the circumferential flow braked, as it brings only a small contribution to the resolution. Another typical design is the open top pulper with laterally inserted rotor. Then the suspension is conveyed approximately horizontally to the rotor and deflected on the side wall of the container carrying the rotor. This hydraulically often less favorable form has the advantage of finding space under the paper machine as broke dissolver. The promotion of the actual Umtriebs, ie the repeated transport of the substance to be dissolved in the rotor area usually brings an improvement of the effect. For this reason, a great deal of development has already been carried out on the rotors and containers of the pulper.

Einen Versuch, Stofflöser dieser Art zu verbessern, zeigt die DE 36 38 993 C2 .An attempt to improve pulpers of this kind, shows the DE 36 38 993 C2 ,

Ausführungsvarianten für in solchen Stofflösern einsetzbare Rotoren sind aus vielen Publikationen bekannt, z.B.: DE 25 00 860 A1 , US 4,480,796 A , DE 102 54 544 A1 und DE 844 116 C .Design variants for rotors usable in such pulpers are known from many publications, eg: DE 25 00 860 A1 . US 4,480,796 A . DE 102 54 544 A1 and DE 844 116 C ,

Diese Publikationen zeigen auch, dass es bei der Entwicklung solcher Rotoren gilt, eine Vielzahl von verschiedenen Anforderungen zu erfüllen, insbesondere Auflösung, Wirtschaftlichkeit, Siebfreihaltung, Verschleißverhalten und Herstellkosten.These publications also show that in the development of such rotors it is necessary to meet a variety of different requirements, in particular resolution, economy, Siebfreihaltung, wear behavior and manufacturing costs.

Der Erfindung liegt die Aufgabe zu Grunde, Stofflöser für das Zerkleinern und Suspendieren von Papierstoff so zu verbessern, dass der Auflösevorgang wirtschaftlicher und schonender durchgeführt werden kann.The invention is based on the object to improve pulpers for crushing and suspending paper stock so that the dissolution process can be carried out more economically and gently.

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

Mit Hilfe der erfindungsgemäßen Merkmale, insbesondere der Neugestaltung des Rotors wird eine verbesserte Entstippungswirkung erreichbar. Dabei sind die an der Oberseite der Flügel vorstehenden Arbeitsleisten geeignet, die Auflösewirkung zu verstärken. Dieses Merkmal kann auch kombiniert sein mit den an sich bekannten Auflöseleisten oder Vorsprüngen, die sich an der dem Sieb zugewandten Seite des Rotors befinden können. In diesem Bereich, also in dem Zwischenraum zwischen Rotor und Sieb, findet ebenfalls eine intensive Bearbeitung des Papierstoffes durch Scherkräfte statt, sofern dieser fein genug ist, um dort hin zu gelangen. Weitere Vorteile sind dadurch möglich, dass die Flügel des Rotors stark geschwungen sind und an ihrem Außenradius einen relativ spitzen Winkel mit dem Umfangskreis bilden. Insbesondere, wenn ein flacher Auflösebehälter mit seitlich angesetztem Rotor verwendet wird, kann darin mit dieser Maßnahme eine drallarme Strömung erzeugt werden.With the aid of the features according to the invention, in particular the redesign of the rotor, an improved deflaking effect can be achieved. The working strips at the top of the wings are suitable for intensifying the dissolving effect. This feature may also be combined with the known dissolution ledges or protrusions attached to the sieve facing side of the rotor can be located. In this area, ie in the space between the rotor and sieve, there is also an intensive processing of the pulp by shear forces, provided that it is fine enough to get there. Further advantages are possible in that the blades of the rotor are strongly curved and form a relatively acute angle with the peripheral circle at its outer radius. In particular, if a flat dissolving container is used with laterally attached rotor, it can be generated with this measure a low-spin flow.

In speziellen Ausgestaltungen kann der Verschleißschutz dadurch verbessert werden, dass die Vorderseiten der Flügel oder der Arbeitsleisten mit auswechselbaren verschleißfesten Platten oder Streifen versehen sind. Es ist auch denkbar, die Arbeitsleisten insgesamt als auswechselbare Verschleißteile auszubilden.In specific embodiments, the wear protection can be improved by providing the front sides of the wings or the working strips with replaceable wear-resistant plates or strips. It is also conceivable to design the working strips in total as replaceable wear parts.

Die Erfindung wird erläutert an Hand von Zeichnungen. Dabei zeigen:

Figur 1:
eine Ansicht des Sieb- und Rotorbereiches eines erfindungsgemäßen Stofflösers;
Figur 2:
einen Schnitt gemäß Linie II in der Fig. 1;
Figur 3:
einen Schnitt gemäß Linie III in der Fig. 1;
Figur 4:
einen erfindungsgemäßen Stofflöser in geschnittener Seitenansicht;
Figur 5:
einen weiteren erfindungsgemäßen Stofflöser in Ansicht von oben mit seitlich angesetztem Rotor.
The invention will be explained with reference to drawings. Showing:
FIG. 1:
a view of the screen and rotor portion of a pulper according to the invention;
FIG. 2:
a section along line II in the Fig. 1 ;
FIG. 3:
a section along line III in the Fig. 1 ;
FIG. 4:
a pulper according to the invention in a sectional side view;
FIG. 5:
a further pulper according to the invention in top view with laterally attached rotor.

Figur 1 zeigt die Draufsicht auf einen Rotor für einen erfindungsgemäßen Stofflöser. Auch wenn ein solcher Rotor im Stofflöser nicht immer waagerecht liegt, also mit senkrechter Achse betrieben wird, wird hier von dieser speziellen Einbausituation ausgegangen und dementsprechend von "oben" und "unten" gesprochen. Der Rotor 2 ist mit insgesamt fünf geschwungenen Flügeln 3 versehen und wird bei Betrieb des Stofflösers in Rotationsrichtung 6 rotierend angetrieben. Einer der Flügel ist unterhalb der Arbeitsleiste 7 geschnitten dargestellt. In an sich bekannter Weise wirkt der Rotor mit einem Sieb 10 zusammen, von dem hier nur ein kleiner Teil gezeichnet ist. Dieses Sieb 10 ist in einem Abstand A zur Unterseite des Rotors montiert (siehe Fig. 2). Dabei ist der kleinste Abstand A möglichst gering, damit eine gute Auflösung erreicht wird und damit der Rotor bzw. seine Flügel 3 zur Freihaltung der Sieböffnungen 11 dienen können. Er liegt mit Vorteil bei wenigen Millimetern. Ist das Sieb auf der dem Rotor zugewandten Seite mit Leisten versehen, was die Auflösewirkung vorteilhaft verstärkt, ist der Abstand A von der Oberseite der Leiste aus zu messen. FIG. 1 shows the top view of a rotor for a pulper according to the invention. Even if such a rotor in the pulper is not always horizontal, that is operated with a vertical axis, it is assumed here of this special installation situation and accordingly spoken of "top" and "bottom". The rotor 2 is provided with a total of five curved wings 3 and is driven in rotation in the direction of rotation 6 during operation of the pulper. One of the wings is shown below the task bar 7 cut. In a manner known per se, the rotor acts with a sieve 10 together, of which only a small part is drawn here. This sieve 10 is mounted at a distance A to the bottom of the rotor (see Fig. 2 ). In this case, the smallest distance A is as small as possible, so that a good resolution is achieved and thus the rotor or its wings 3 can serve to keep the screen openings 11 free. It lies with advantage with few millimeters. If the sieve is provided with strips on the side facing the rotor, which advantageously enhances the dissolving effect, the distance A is to be measured from the upper side of the strip.

Wichtig für die Lösung der erfindungsgemäßen Aufgabe ist auch, dass auf der Oberseite der geschwungenen Flügel 3 Arbeitsleisten 7 angebracht sind, die in Rotationsrichtung 6 vorstehen und z.B. einen rechteckigen Querschnitt haben können. Mit Vorteil können ihre Oberseite 16 und/oder Unterseite 15, zumindest zum überwiegenden Anteil senkrecht zur Rotorachse ausgerichtet sein. Ihre Axialerstreckung B ist im Vergleich zur Axialerstreckung der Flügel 3 mit Vorteil relativ gering, z.B. zwischen 5 und 20%. Mit Hilfe dieser Arbeitsleisten 7 kann die Papierstoffsuspension besonders wirksam aufgelöst werden. Thre Arbeitskanten können glatt oder mit einem Zackenprofil versehen sein. Mit der Tangente an den Umfangskreis 5 des Rotors bilden die Vorderseiten der Arbeitsleisten 7 einen Schnittwinkel β, der mindestens 40°, vorzugsweise mindestens 60° beträgt, was den Zerkleinerungseffekt verstärkt.Important for the solution of the object according to the invention is also that on the upper side of the curved wings 3 working strips 7 are mounted, which project in the direction of rotation 6 and e.g. can have a rectangular cross-section. Advantageously, their upper side 16 and / or lower side 15, at least predominantly aligned perpendicular to the rotor axis. Its axial extent B is advantageously relatively small compared to the axial extent of the wings 3, e.g. between 5 and 20%. With the help of this 7 Arbeitsleisten the pulp suspension can be resolved particularly effective. Thre working edges can be smooth or with a serrated profile. With the tangent to the circumferential circle 5 of the rotor, the front sides of the working strips 7 form a cutting angle β which is at least 40 °, preferably at least 60 °, which enhances the comminution effect.

Die Flügel 3 des Rotors haben an ihrer Vorderseite, also der Seite, die bei Rotation die Suspension treibt, unterhalb der Arbeitsleisten 7 eine vorn liegende Fläche 4, deren Projektion auf das Sieb 11 den Umfangskreis 5 mit einem Winkel α von höchstens 20° schneidet. Dadurch ist dieser Winkel α relativ spitz und hat wegen der ausgeprägten radialen Förderwirkung eine besondere hydraulische Wirkung beim Umtrieb der Suspension im Stofflöser. In Fig. 1 ist die Linie II eingetragen, entlang der ein Schnitt gelegt und in Fig. 2 dargestellt ist. Dieser Schnitt durch den Flügel 3, den Nabenkörper 9 des Rotors und das Sieb 10 zeigt insbesondere den Abstand A zwischen Unterseite des Rotors und Oberseite des Siebes 10. Ferner ist eine Abrundung 13 zwischen Arbeitsleisten 7 und Vorderkanten der Flügel 3 im radial äußeren Bereich des Rotors sichtbar (hier als aufweisen. Man erkennt auch, dass bei dem hier gezeigten Beispiel der Nabenkörper 9 des Rotors mit Hilfe von Schrauben 14 auf einem Wellenflansch 12 lösbar befestigt ist.The blades 3 of the rotor have on its front side, ie the side which drives the suspension during rotation, below the working strips 7, a front surface 4 whose projection on the wire 11 the circumferential circle 5 intersects at an angle α of at most 20 °. As a result, this angle α is relatively acute and has a special hydraulic effect when driving the suspension in the pulper because of the pronounced radial conveying action. In Fig. 1 is entered the line II, along which a cut is laid and in Fig. 2 is shown. This section through the wing 3, the hub body 9 of the rotor and the screen 10 shows in particular the distance A between the underside of the rotor and the top of the screen 10. Further, a rounding 13 between working strips 7 and leading edges of the wings 3 in the radially outer region of the rotor visible (here as exhibit. It can also be seen that in the example shown here, the hub body 9 of the rotor is fastened releasably on a shaft flange 12 by means of screws 14.

In Fig. 3 ist ein Schnitt gemäß der Linie III (Fig. 1) sichtbar. Auch an dieser Stelle ist ein Teil der Arbeitsleiste 7 erkennbar, die sich allerdings mit einer nur noch kleinen Abrundung an der vorn liegenden Fläche 4 des Flügels 3 anschließt. In Siebnähe ist die Fläche 4 zu einer zum Sieb senkrechten Ebene parallel, also gegenüber der Axialrichtung des Rotors 2 nicht geneigt oder mit einem Neigungswinkel y geneigt, wobei dieser Neigungswinkel γ vorteilhafterweise zwischen 15 und 30° liegt. Da diese Neigung so gerichtet ist, dass die dem Sieb ferner liegenden Teile der Fläche 4 in Rotationsrichtung vorstehen, wird eine Strömungskomponente in Richtung Sieb erzeugt, was in vielen Fällen die Auflösewirkung des Rotors verbessert.In Fig. 3 is a section according to the line III ( Fig. 1 ) visible, noticeable. Also at this point, a part of the task bar 7 can be seen, which, however, followed by only a small rounding on the front surface 4 of the wing 3. Near the screen, the surface 4 is parallel to a plane perpendicular to the wire, that is not inclined relative to the axial direction of the rotor 2 or inclined at an inclination angle y, wherein this inclination angle γ is advantageously between 15 and 30 °. Since this inclination is directed so that the parts of the surface 4 further away from the screen project in the direction of rotation, a flow component is produced in the direction of the screen, which in many cases improves the resolving action of the rotor.

Eine Ausführungsform eines Stofflösers, auf den die Erfindung angewendet werden kann, ist der stehende zylindrische oben offene Stofflöser gemäß Fig. 4, bei dem sich Sieb 10 und Rotor 2 im Bodenbereich befinden. Vorteilhafterweise hat der Rotor 2 eine Axialerstreckung E, die zwischen 10 % und 20 % des Durchmessers des Umfangskreises 5 beträgt. Der Stofflöser ist dann besonders für Konsistenzen zwischen 2 und 6 % geeignet. Beim Betrieb werden Papierstoff S und Wasser W in den Behälter 1 des Stofflösers eingetragen. Die fertige pumpfähige Suspension wird durch die Sieböffnungen des Siebes 10 hindurch als Gutstoff G abgezogen. Eine andere ebenfalls vorteilhafte Ausführungsform der Erfindung ist ein Stofflöser mit mindestens einem seitlich angebrachten Rotor gemäß Fig. 5 mit einem liegenden Behälter 1'. Ein liegender Behälter kann z.B. unter einer Papiermaschine zur Auflösung von Produktionsausschuss eingesetzt werden. Wegen der hydraulisch weniger günstigen Form eines liegenden Behälters 1' sind die Anforderungen an den Rotor allerdings besonders hoch. Als weitere Anwendung ist auch ein Sekundärstofflöser z.B. gemäß DE -A-23 45 735 denkbar, der mit einem in den Ansprüchen beschriebenen Rotor versehen ist.One embodiment of a pulper to which the invention can be applied is the standing cylindrical open top pulper according to FIG Fig. 4 in which sieve 10 and rotor 2 are located in the bottom area. Advantageously, the rotor 2 has an axial extent E which is between 10% and 20% of the diameter of the circumferential circle 5. The pulper is then particularly suitable for consistencies between 2 and 6%. During operation, pulp S and water W are introduced into the container 1 of the pulper. The finished pumpable suspension is withdrawn through the screen openings of the screen 10 as accept G. Another likewise advantageous embodiment of the invention is a pulper with at least one laterally mounted rotor according to Fig. 5 with a horizontal container 1 '. A lying container can be used, for example, under a paper machine for the dissolution of production scrap. Due to the hydraulically less favorable shape of a horizontal container 1 ', however, the requirements for the rotor are particularly high. As a further application is also a Sekundärstofflöser eg according to DE-A-2345735 conceivable, which is provided with a rotor described in the claims.

Claims (19)

  1. Pulper for disintegration and suspension of paper pulp (S)
    - having a container (1) to hold water and paper pulp (S) and
    - having at least one rotor (2) which can be driven and is arranged in the container (1),
    - which has at least two blades to circulate a suspension contained in the container, in order in the process to disintegrate the paper pulp put in and to suspend it in water, and
    - having at least one screen (10), whose screen area is swept over completely or for the most part by the moving rotor (2),
    characterized
    - in that the rotor (2) is provided with curved blades (3), whose face (4) located in front in the direction of rotation (6) at the circumferential circle (5) forms an angle (α) of at most 20° with the latter, and
    - in that the upper side of the curved blades (3) is provided with working bars (7) which project in the direction of rotation (6) and whose angle of intersection (β) with the circumferential circle (5) is at least 40°, preferably at least 60°.
  2. Pulper according to Claim 1, characterized in that the container (1) is open at the top for the input of the paper pulp (S).
  3. Pulper according to Claim 1 or 2, characterized in that the screen (10) is flat and shaped like a circular ring.
  4. Pulper according to Claim 1, 2 or 3, characterized in that the pulper has a single flat screen (10), which is swept over partly or completely by the moving rotor (2).
  5. Pulper according to Claim 1, 2, 3 or 4,
    characterized in that the smallest distance (A) between the screen (10) and the side of the blades (3) facing the screen is between 1 and 20 mm.
  6. Pulper according to one of the preceding claims, characterized in that the working edges (8) of the working bars (7) which are located in front in the direction of rotation are straight.
  7. Pulper according to one of the preceding claims, characterized in that the axial extent (B) of the working bars (7) on the circumferential circle (5) is between 5 and 20% of the axial extent of the blades (3).
  8. Pulper according to one of the preceding claims, characterized in that the maximum radial extent (C) of the projecting working bars (7) is between 5 and 30% of the radius of the circumferential circle (5).
  9. Pulper according to one of the preceding claims, characterized in that the upper side (16) and/or underside (15) of the working bars (7) are substantially flat and oriented in such a way that they are not inclined with respect to a plane perpendicular to the axis of the rotor (2) or are inclined at a maximum of 5°.
  10. Pulper according to one of the preceding claims, characterized in that the face (4) of the blades (3) which is located in front in the direction of rotation (6) is not inclined with respect to the axial direction of the rotor (2).
  11. Pulper according to one of Claims 1 to 9, characterized in that the face (4) of the blades (3) which is located in front in the direction of rotation (6) has an angle of inclination (γ) of between 1° and 45°, preferably 15° and 30°, with respect to the axial direction of the rotor (2) and is oriented in such a way that the parts of this front side lying further away from the screen project in the direction of rotation (6).
  12. Pulper according to one of the preceding claims, characterized in that the transition between working bars (7) and the front edges of the blades (3) is rounded off in the radially outer region.
  13. Pulper according to Claim 12, characterized in that the rounding (13) has a radius of curvature which is between 20 and 60% of the axial extent of the blade (3).
  14. Pulper according to Claim 12, characterized in that the rounding (13) corresponds to a quarter ellipse.
  15. Pulper according to Claim 12, 13 or 14, characterized in that the rounding (13) is most pronounced in the radially outer region of the blade (3) and decreases continuously towards the radially inner region.
  16. Pulper according to one of the preceding claims, characterized in that the working bars (7) consist of highly wear-resistant material, in particular hard metal.
  17. Pulper according to one of the preceding claims, characterized in that the working bars (7) are fixed detachably to the blades (3).
  18. Pulper according to one of the preceding claims, characterized in that the maximum axial extent (E) of the rotor (2) has a value between 8% and 35% of the diameter of the circumferential circle (5), preferably between 10% and 20%.
  19. Rotor (2) for a pulper for disintegration and suspension of paper pulp (S) in water (W),
    the pulper having a container (1) to hold water and paper pulp (S) and at least one screen (10), whose screen area is swept over completely or for the most part by the moving rotor (2),
    the rotor (2) having at least two blades to circulate a suspension contained in the container, in order in the process to disintegrate the paper pulp put in and to suspend it in water,
    characterized
    - in that the rotor (2) is provided with curved blades (3), whose face (4) located in front in the direction of rotation (6) at the circumferential circle (5) forms an angle (α) of at most 20° with the latter, and
    - in that the upper side of the curved blades (3) is provided with working bars (7) which project in the direction of rotation (6) and whose angle of intersection (β) with the circumferential circle (5) is at least 40°, preferably at least 60°.
EP06000661A 2005-02-22 2006-01-13 Pulper for disintegration and suspension of paper pulp and rotor suitable for such a pulper Active EP1693505B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005007972A DE102005007972A1 (en) 2005-02-22 2005-02-22 Pulper for comminution and suspension of pulp and rotor for such a pulper

Publications (2)

Publication Number Publication Date
EP1693505A1 EP1693505A1 (en) 2006-08-23
EP1693505B1 true EP1693505B1 (en) 2008-11-26

Family

ID=36498965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06000661A Active EP1693505B1 (en) 2005-02-22 2006-01-13 Pulper for disintegration and suspension of paper pulp and rotor suitable for such a pulper

Country Status (4)

Country Link
EP (1) EP1693505B1 (en)
AT (1) ATE415514T1 (en)
DE (2) DE102005007972A1 (en)
ES (1) ES2318591T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103015242A (en) * 2013-01-22 2013-04-03 富民宝地纸业有限公司 Efficient rotating cutter device for waste paper pulping cutting

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009017951U1 (en) * 2009-10-13 2010-10-21 Voith Patent Gmbh pulper
CN101912743B (en) * 2010-08-10 2012-04-18 杭州三拓印染设备技术开发有限公司 Blade of pulping machine
DE102011005024A1 (en) * 2011-03-03 2012-09-06 Voith Patent Gmbh rotor
DE102018109634A1 (en) * 2018-04-23 2019-10-24 Voith Patent Gmbh pulper

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE844116C (en) 1947-12-08 1952-07-17 Leje & Thurne Aktiebolag Shredding machine for the treatment of cellulose and / or waste paper
DE1185467B (en) * 1961-04-07 1965-01-14 Tello Maviglia Device for dissolving fibrous materials for the production of paper
US3889885A (en) * 1974-01-11 1975-06-17 Black Clawson Co Pulping apparatus
US4480796A (en) 1982-01-25 1984-11-06 Beloit Corporation Pulping apparatus including improved rotor
FI72356C (en) * 1985-12-31 1987-05-11 Yhtyneet Paperitehtaat Oy Device for destruction of paper and cardboard.
DE10254544A1 (en) 2002-09-26 2004-04-08 Edelstahl Jansen Gmbh Rotor, for a pulper, has hardened guides fitted to the leading edges of the rotor blades, which resist wear and are rapidly replaced on site

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103015242A (en) * 2013-01-22 2013-04-03 富民宝地纸业有限公司 Efficient rotating cutter device for waste paper pulping cutting
CN103015242B (en) * 2013-01-22 2015-05-13 富民宝地纸业有限公司 Efficient rotating cutter device for waste paper pulping cutting

Also Published As

Publication number Publication date
ES2318591T3 (en) 2009-05-01
EP1693505A1 (en) 2006-08-23
ATE415514T1 (en) 2008-12-15
DE102005007972A1 (en) 2006-08-24
DE502006002152D1 (en) 2009-01-08

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