EP0321665B1 - Pulper with high pulping efficiency - Google Patents

Pulper with high pulping efficiency Download PDF

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Publication number
EP0321665B1
EP0321665B1 EP88116825A EP88116825A EP0321665B1 EP 0321665 B1 EP0321665 B1 EP 0321665B1 EP 88116825 A EP88116825 A EP 88116825A EP 88116825 A EP88116825 A EP 88116825A EP 0321665 B1 EP0321665 B1 EP 0321665B1
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EP
European Patent Office
Prior art keywords
container
rotor
pulper
base rotor
base
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Expired - Lifetime
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EP88116825A
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German (de)
French (fr)
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EP0321665A1 (en
Inventor
Jochen Krebs
Wolfgang Dr. Siewert
Arthur Pfau
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Sulzer Escher Wyss GmbH
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Sulzer Escher Wyss GmbH
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Priority to AT88116825T priority Critical patent/ATE62286T1/en
Publication of EP0321665A1 publication Critical patent/EP0321665A1/en
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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
    • D21B1/345—Pulpers

Definitions

  • the invention relates to a pulper according to the preamble of patent claim 1.
  • Such a pulper _ or "pulper” is e.g. known from EP 0189 379 A1.
  • the fiber-containing material is dissolved in the vessel with the addition of water, the contents of which are set in motion and kept in motion by means of the rotating screw conveyor and the rotating bottom rotor.
  • the known pulper has a relatively high energy requirement, since the transport of the material through the vessel is not optimal. Both the screw conveyor and the bottom rotor work less efficiently, and the flow of the material is vortex-like, with dead spots in which there is very little movement. Thus, the treatment of the material is locally uneven, which delays a treatment to a satisfactory homogeneity of the material.
  • the known pulper is otherwise basically a robust and reliable device
  • the inventors have set themselves the task of improving the pulper.
  • the main aim is to increase the transport efficiency of the screw conveyor and the bottom rotor.
  • a further task is to design the circulation of the material in the vessel without dead spots, as a result of which an even treatment is achieved and the treatment time is to be shortened as a result. This should then lead to significantly lower energy requirements.
  • the Pulper 1 is a pulper for the manufacture of paper products and similar products containing fabric fibers.
  • the pulper 1 has a cylindrical, upright vessel for receiving the material to be dissolved, on the bottom of which a rapidly rotatable, horizontally arranged bottom rotor 12 is mounted. It has ribs 3 at the top.
  • the transport screw picks up the material in the top of the vessel and leads it to the bottom rotor, where it is taken up by the surface of the bottom rotor and flung radially outward.
  • the lower end 14 of the screw conveyor 6 extends in the immediate vicinity of the highest point of the bottom rotor 12. As shown in FIG. 2, the end 14 of the screw conveyor 6 is removed from the highest point of the bottom rotor 12 is less than 1/10 of the diameter 15 of the bottom rotor 12.
  • the diameter 13 of the imaginary circumference (shown in FIG. 3) of the bottom worm gear 14 is approximately 1/3 to 1/4 of the diameter 15 of the bottom rotor 12. It can also be advantageous if the transport screw does not have the same diameter everywhere along its length, so that, for example, a conical shape results.
  • the generatrix 16 of the spiral path of the screw conveyor 6 to its axis is at an angle of less than 90 ° in the direction of transport of the screw conveyor, ie it is inclined downwards.
  • the generatrix 16 can be in the form of an inclined line, a downward-pointing angle profile or a downwardly inclined arc. So that the wall of the spiral passage is designed so that the throwing away of the material to be transported to the bottom rotor 12 is practically prevented.
  • baffle plates 17 are attached to the circumference of the vessel 2. They are flat and curved towards the inside of the vessel and direct the flow of the material into the interior of the vessel. This prevents the tendency to vortex formation in the vessel, and there is a desired, advantageous, toroidal flow, as indicated by the thick, dashed curve line in FIG. 1.
  • the baffle plates 17 are shaped so that their greatest distance 20 from the inner wall of the vessel 2 (FIG. 4) is approximately 0.04 times the inner diameter of the vessel 2.
  • Each baffle plate 17 forms an angle of approximately 30 ° with a tangent 18 drawn to the starting point of the baffle plate, as it is designated by 19 in FIG. 4.
  • the curvature of the baffle plates 17 can deviate from that of the circumference of the vessel 2.
  • the arrangement of the ribs 3 on the surface of the bottom rotor 12 is also important. They point radially outwards and are regularly distributed in a circle. Their number, based on the speed of rotation of the bottom rotor 12, is to be adapted to the postulate that when the bottom rotor rotates, one rib leads the following by a time interval of more than 0.02 sec. This means that in an imaginary checkpoint, a rib runs past the previous one by more than 0.02 sec. This is important for penetration of the material into the space between the ribs 3 desired contact of the material with the surface of the bottom rotor and for optimizing its transport performance, otherwise the material would be rejected by the ribs 3 at a higher frequency, which would disturb the desired contact .

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

To achieve the best possible uniform pulping in a pulper in a shorter time with favourable energy input, it is proposed to optimise geometrical measurements of the base rotor (12) arranged at the base of the pulper vessel (2), and of a transport screw (6) directed towards the rotor and the arrangement of the screw. The lower end (14) of the transport helical screw (6) extends to the immediate vicinity of the highest point of the base rotor (12). The distance between the end of the transport screw (6) and the highest point of the base rotor (12) is smaller than 1/10 of the diameter of the base rotor (12). The diameter of the imagined circular surface of the lowest screw flight is about one third to one quarter of the diameter of the base rotor (12). The generatrix of the helix is inclined downwards to the axis of the transport screw (6) in the transport direction. Flat deflector plates are arranged on the inner circumference of the vessel (2) to direct the flow in the direction of the middle of the vessel (2). In this way, formation of a vortex in the transport flow in the vessel is prevented and a favourable toroidal transport flow is created. <IMAGE>

Description

Die Erfindung betrifft einen Pulper gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a pulper according to the preamble of patent claim 1.

Ein solcher Pulper _ oder auch "Stoffauflöser" _ ist z.B. aus EP 0189 379 A 1 bekannt. Die Auflösung des faserhaltigen Materials erfolgt unter Zugabe von Wasser in dem Gefäß, dessen Inhaltsstoffe mittels der rotierenden Transportschnecke und des rotierenden Bodenrotors in Bewegung gebracht und gehalten werden. Der bekannte Pulper weist einen relativ hohen Energiebedarf auf, da der Transport des Materials durch das Gefäß nicht optimal gestaltet ist. Wenig effizient arbeiten sowohl die Transportschnecke, wie auch der Bodenrotor, und der Strom des Materials gestaltet sich wirbelartig, wobei tote Stellen, in denen nur sehr geringe Bewegung herrscht, vorkommen. So ist die Behandlung des Materials örtlich ungleichmäßig, was eine Behandlung bis zu einer befriedigenden Homogenität des Materials zeitlich in die Länge zieht.Such a pulper _ or "pulper" is e.g. known from EP 0189 379 A1. The fiber-containing material is dissolved in the vessel with the addition of water, the contents of which are set in motion and kept in motion by means of the rotating screw conveyor and the rotating bottom rotor. The known pulper has a relatively high energy requirement, since the transport of the material through the vessel is not optimal. Both the screw conveyor and the bottom rotor work less efficiently, and the flow of the material is vortex-like, with dead spots in which there is very little movement. Thus, the treatment of the material is locally uneven, which delays a treatment to a satisfactory homogeneity of the material.

Weil aber der bekannte Pulper sonst prinzipiell eine robuste und verläßliche Vorrichtung ist, haben sich die Erfinder die Aufgabe gestellt, den Pulper zu verbessern. Hauptsächlich soll die Transporteffizienz der Transportschnecke und des Bodenrotors gesteigert werden. Eine weitere Aufgabe ist es, den Kreislauf des Materials in dem Gefäß ohne tote Stellen zu gestalten, wodurch eine gleichmäßige Behandlung erzielt werden und dadurch die Behandlungszeit verkürzt werden soll. Dies soll dann zu wesentlich niedrigerem Energiebedarf führen.However, because the known pulper is otherwise basically a robust and reliable device, the inventors have set themselves the task of improving the pulper. The main aim is to increase the transport efficiency of the screw conveyor and the bottom rotor. A further task is to design the circulation of the material in the vessel without dead spots, as a result of which an even treatment is achieved and the treatment time is to be shortened as a result. This should then lead to significantly lower energy requirements.

Diese Aufgabe wird an einem Pulper der anfangs angegebenen Art durch Maßnahmen, die im kennzeichnenden Teil des Patentanspruchs 1 angegeben sind, erfüllt.This object is achieved on a pulper of the type initially specified by measures which are specified in the characterizing part of patent claim 1.

In den Unteransprüchen sind sinnvolle Ausführungsbeispiele des Erfindungsgegenstandes angegeben.Sensible exemplary embodiments of the subject matter of the invention are specified in the subclaims.

Durch diese Maßnahmen kommt es zur Abstimmung des Volumenförderstromes bei Übergabe von der langsam rotierenden Transportschnecke in den Bereich des schnellrotierenden Bodenrotors bei der vorgeschlagenen Optimierung der geometrischen Abmessungen. Bei der erfindungsgemäß optimierten Förderwirkung wird ein umlaufender Förderstrom durch das Gefäß vom Bodenrotor zum Anfang der Transportschnecke ohne tote Stellen erreicht, was zu einer gleichmäßigen Behandlung und zum bestmöglichen Auflösen des Materials in kürzerer Zeit führt. Dies alles bei günstigerem Energieeinsatz im Vergleich zu bekannten Systemen, sowohl im Normal-, wie auch im Hochkonsistenz-Bereich des aufzulösenden Materials.These measures result in coordination of the volume flow when transferring from the slowly rotating screw conveyor into the area of the fast rotating floor rotor in the proposed optimization of the geometric dimensions. With the conveying effect optimized according to the invention, a circulating conveying flow through the vessel from the bottom rotor to the start of the screw conveyor is achieved without dead spots, which leads to uniform treatment and the best possible dissolving of the material in a shorter time. All this with cheaper energy consumption compared to known systems, both in the normal and in the high-consistency area of the material to be dissolved.

Im weiteren wird der Gegenstand anhand einer Zeichnung näher beschrieben und erklärt.The subject is described and explained in more detail with the aid of a drawing.

In der Zeichnung zeigen:

  • Fig. 1 schematisch einen erfindungsgemäßen Pulper,
  • Fig. 2 in partieller Ansicht die Größenverhältnisse zwischen den Abmessungen des Bodenrotors und der Transportschnecke,
  • Fig. 3 das Ende der Transportschnecke von unten gesehen,
  • Fig. 4 einen Querschnitt durch das Gefäß des Pulpers,
  • Fig 5 bis
  • Fig. 7 Beispiele der Ausführung der Transportschnecke.
The drawing shows:
  • 1 schematically shows a pulper according to the invention,
  • 2 is a partial view of the proportions between the dimensions of the bottom rotor and the screw conveyor,
  • 3 seen the end of the screw conveyor from below,
  • 4 shows a cross section through the vessel of the pulper,
  • Fig 5 to
  • Fig. 7 examples of the execution of the screw conveyor.

Der Pulper 1 ist ein Stoffauflöser für die Herstellung von Papierprodukten und ähnlicher Stofffaser aufweisende Produkte. Der Pulper 1 hat zur Aufnahme des aufzulösenden Materials ein zylinderförmiges, senkrecht stehendes Gefäß, an dessen boden ein schnell rotierbarer, horizontal angeordneter Bodenrotor 12 gelagert ist. Er weist oben Rippen 3 auf. Zu dem Bodenrotor 12 weist von oben eine Transportschnecke 6, die langsamer als der Bodenrotor rotierbar ist. Im wesentlichen ist sie vertikal angeordnet, kann aber auch leicht pendelbar sein. Sie führt zentrisch zu einer höchsten Stelle des Bodenrotors 12. Die Transportschnecke nimmt oben im Gefäß das Material auf und führt es zum Bodenrotor, wo es von der Oberfläche des Bodenrotors übernommen und radial auswärts geschleudert wird. Dadurch entsteht ein ständiger Umlauf des Materials im Gefäß 2. Das untere Ende 14 der Transportschnecke 6 reicht bis in unmittelbaree Nähe der höchsten Stelle des Bodenrotors 12. Wie es in Fig. 2 gezeigt ist, ist die Entfernung des Endes 14 der Transportschnecke 6 von der höchsten Stelle des Bodenrotors 12 kleiner als 1/10 des Durchmessers 15 des Bodenrotors 12. Dabei ist der Durchmesser 13 des gedachten Umfanges (in Fig. 3 dargestellt) des untersten Schneckenganges 14 ca. 1/3 bis 1/4 des Durchmessers 15 des Bodenrotors 12. Es kann auch von Vorteil sein, wenn die Transportschnecke auf ihrer Länge nicht überall den gleichen Durchmesser hat, so daß sich beispielsweise eine konische Form ergibt.The Pulper 1 is a pulper for the manufacture of paper products and similar products containing fabric fibers. The pulper 1 has a cylindrical, upright vessel for receiving the material to be dissolved, on the bottom of which a rapidly rotatable, horizontally arranged bottom rotor 12 is mounted. It has ribs 3 at the top. A feed screw 6, which can be rotated more slowly than the bottom rotor, points to the bottom rotor 12 from above. In essence, it is arranged vertically, but can also be easily pendulum. It leads centrally to a highest point of the bottom rotor 12. The transport screw picks up the material in the top of the vessel and leads it to the bottom rotor, where it is taken up by the surface of the bottom rotor and flung radially outward. This creates a constant circulation of the material in the vessel 2. The lower end 14 of the screw conveyor 6 extends in the immediate vicinity of the highest point of the bottom rotor 12. As shown in FIG. 2, the end 14 of the screw conveyor 6 is removed from the highest point of the bottom rotor 12 is less than 1/10 of the diameter 15 of the bottom rotor 12. The diameter 13 of the imaginary circumference (shown in FIG. 3) of the bottom worm gear 14 is approximately 1/3 to 1/4 of the diameter 15 of the bottom rotor 12. It can also be advantageous if the transport screw does not have the same diameter everywhere along its length, so that, for example, a conical shape results.

Um ein Wegschleudern des Materials von der Transportschnecke 6, was die Transportleistung der Transportschnecke beeinträchtigen würde, zu verhindern, ist die Erzeugende 16 des Wendelganges der Transportschnecke 6 zu ihrer Achse um einen Winkel kleiner als 90° in Transportrichtung der Transportschnecke, d.h. nach unten geneigt. Die Erzeugende 16 kann die Form einer geneigten Linie eines nach unten weisenden Winkelprofils oder eines nach unten geneigten Bogens haben. Damit ist die Wand des Wendelganges so gestaltet, daß das Wegschleudern des zu dem Bodenrotor 12 zu transportierenden Materials praktisch verhindert wird.In order to prevent the material from being thrown away by the screw conveyor 6, which would impair the transport performance of the screw conveyor, the generatrix 16 of the spiral path of the screw conveyor 6 to its axis is at an angle of less than 90 ° in the direction of transport of the screw conveyor, ie it is inclined downwards. The generatrix 16 can be in the form of an inclined line, a downward-pointing angle profile or a downwardly inclined arc. So that the wall of the spiral passage is designed so that the throwing away of the material to be transported to the bottom rotor 12 is practically prevented.

Zur Verhinderung eines wirbelartigen Rotierens des Materialstromes entlang des Umfangs des Gefässes 2 ist am Umfang des Gefässes 2 eine Anzahl Prallbleche 17 befestigt. Sie sind flach und zum Innern des Gefässes gebogen und leiten den Strom des Materials in das Innere des Gefässes. Damit wird die Neigung zu der Wirbelbildung im Gefäß unterbunden, und es herrscht eine gewünschte, vorteilhafte, toroidale Strömung, wie es mit der gestrichelten, dicken Kurvenlinie in Fig. 1 angedeutet ist. Zur Erfüllung dieser Aufgabe sind die Prallbleche 17 so geformt, daß ihr größter Abstand 20 von der Innenwand des Gefässes 2 (Fig. 4) das ca. 0,04-Fache des inneren Durchmessers des Gefässes 2 beträgt. Jedes Prallbelch 17 bildet mit einer zu dem Ansatzpunkt des Prallblechs gezogenen Tangente 18 einen Winkel von ca. 30°, wie es _ bezeichnet mit 19 _ in der Fig. 4 gezeigt ist. Die Krümmung der Prallbleche 17 kann von der des Umfanges des Gefässes 2 abweichen.In order to prevent a vortex-like rotation of the material flow along the circumference of the vessel 2, a number of baffle plates 17 are attached to the circumference of the vessel 2. They are flat and curved towards the inside of the vessel and direct the flow of the material into the interior of the vessel. This prevents the tendency to vortex formation in the vessel, and there is a desired, advantageous, toroidal flow, as indicated by the thick, dashed curve line in FIG. 1. To accomplish this task, the baffle plates 17 are shaped so that their greatest distance 20 from the inner wall of the vessel 2 (FIG. 4) is approximately 0.04 times the inner diameter of the vessel 2. Each baffle plate 17 forms an angle of approximately 30 ° with a tangent 18 drawn to the starting point of the baffle plate, as it is designated by 19 in FIG. 4. The curvature of the baffle plates 17 can deviate from that of the circumference of the vessel 2.

Wichtig ist auch die Anordnungsweise der Rippen 3 auf der Oberfläche des Bodenrotors 12. Sie weisen radial nach auswärts und sind regelmäßig im Kreis verteilt. Ihre Anzahl, bezogen auf die Drehgeschwindigkeit des Bodenrotors 12 ist dem Postulat anzupassen, daß beim Drehen des Bodenrotors eine Rippe der nachfolgenden um einen Zeitabstand von mehr als 0,02 sec voreilt. Das heißt, daß in einem gedachten Kontrollpunkt eine Rippe um mehr als 0,02 sec später als die vorangegangene vorbeiläuft. Dies ist zum Eindringen des Materials in den Raum zwischen den Rippen 3 gewünschten Kontakt des Materials zu der Oberfläche des Bodenrotors und zur Optimierung seiner Transportleistung wichtig, sonst würde nämlich das Material bei höherer Frequenz der Rippen 3 durch diese abgewiesen, wodurch der gewünschte Kontakt gestört würde. Durch die beschriebenen Maßnahmen wird eine optimale Leistung des Bodenrotors 12 erreicht, welche der maßgebende Faktor zur Gewährleistung optimaler Auflösung des Materials bei optimalen, den Kreislauf gestaltenden Verhältnissen ist. Es läßt sich für den Bodenrotor eine dimensionslose Leistungskennzahl nach folgender Formel errechnen:

Figure imgb0001
(N = aufgenommene Leistung, n = Drehzahl des Bodenrotors, d = Fläche des Bodenrotors, SD = Konsistenz des Materials).The arrangement of the ribs 3 on the surface of the bottom rotor 12 is also important. They point radially outwards and are regularly distributed in a circle. Their number, based on the speed of rotation of the bottom rotor 12, is to be adapted to the postulate that when the bottom rotor rotates, one rib leads the following by a time interval of more than 0.02 sec. This means that in an imaginary checkpoint, a rib runs past the previous one by more than 0.02 sec. This is important for penetration of the material into the space between the ribs 3 desired contact of the material with the surface of the bottom rotor and for optimizing its transport performance, otherwise the material would be rejected by the ribs 3 at a higher frequency, which would disturb the desired contact . The measures described achieve an optimal performance of the bottom rotor 12, which is the decisive factor for ensuring optimal dissolution of the material with optimal conditions which shape the cycle. A dimensionless key performance indicator can be calculated for the bottom rotor using the following formula:
Figure imgb0001
 (N = absorbed power, n = speed of the bottom rotor, d = area of the bottom rotor, SD = consistency of the material).

Demnach wird, verglichen mit herkömmlichem Pulper (N* =  größer als 0,44), beim erfindungsgemäßen Pulper (N* =  0,3) eine Energieersparnis von 20 bis 25% erreicht.Accordingly, compared to conventional pulper (N * = greater than 0.44), an energy saving of 20 to 25% is achieved with the pulper according to the invention (N * = 0.3).

Claims (6)

1. A pulper (1) for paper products and similar fibre-containing products, having a vertical cylindrical container (2) for holding the material to be disintegrated, at the base of which container there is disposed a rapidly rotatable horizontal base rotor (12) with ribs (3) on its upper side, to which rotor the material to be pulped is supplied from above by means of a slowly rotatable spiral conveyor (6) which is arranged centrally to the base rotor (12) and substantially vertically, optionally so that it can oscillate relative to the vertical axis, upon constant circulation in the container (2), characterised in that the lower end (14) of the spiral conveyor (6) extends into the immediate vicinity of the highest point of the base rotor (12), so that the distance (21) of the end of the spiral conveyor (6) from the highest point of the base rotor (12) is less than 1/10 of the diameter (15) of the base rotor (12) and that the external diameter (13) of the imaginary circular ring surface of the lowermost spiral (14) is approximately one third to one quarter of the diameter (15) of the base rotor (12).
2. A pulper according to Claim 1, characterised in that the generatrix (16) of the helix of the spiral conveyor (6) is inclined downwards towards its axis by an angle of less than 90° in the direction of transportation of the spiral conveyor (6) and has the form of an inclined line or an angular profile pointing downwards or an arc inclined downwards.
3. A pulper according to Claim 1, characterised in that flat deflectors (17) are attached to the inner circumference of the container (2) to deflect the flow towards the axis of the container in order to prevent an eddy-like rotation of the material along the circumference of the container (2).
4. A pulper according to Claim 3, characterised in that each deflector (17) forms an angle (19) of about 30° with an imaginary tangent (18) to the starting point of the deflector (17) on the inner circumference of the container (2).
5. A pulper according to Claim 3, characterised in that the maximum distance (20) of the deflector (17) from the inner wall of the container (2) is approximately 0.04 times the internal diameter of the container (2).
6. A pulper according to Claim 1, characterised in that the straight or curved, radially outward-pointing ribs (3) of the base rotor (12) are distributed regularly in a circle in such a number that, taking into account the speed of rotation of the base rotor (12), relative to an imaginary spatially fixed measuring point, they follow each other at a time interval of at least 0.02 sec.
EP88116825A 1987-12-19 1988-10-11 Pulper with high pulping efficiency Expired - Lifetime EP0321665B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88116825T ATE62286T1 (en) 1987-12-19 1988-10-11 PULPER WITH HIGH OPERATING EFFICIENCY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873743247 DE3743247A1 (en) 1987-12-19 1987-12-19 PULPER WITH HIGH RESOLUTION EFFICIENCY
DE3743247 1987-12-19

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EP0321665A1 EP0321665A1 (en) 1989-06-28
EP0321665B1 true EP0321665B1 (en) 1991-04-03

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EP (1) EP0321665B1 (en)
AT (1) ATE62286T1 (en)
DE (2) DE3743247A1 (en)
ES (1) ES2021812B3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1332092C (en) * 2005-02-23 2007-08-15 李风宁 Hydraulic pulp kneader rotor
CN104372702B (en) * 2014-12-15 2016-08-17 济南大学 A kind of pulper of low-power consumption low noise
CN108118548A (en) * 2017-12-22 2018-06-05 鄢海军 A kind of high-efficiency pulper

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648261A (en) * 1950-06-30 1953-08-11 Chaplin Corp Fiber disintegrator and separator
AT286090B (en) * 1966-11-01 1970-11-25 Papcel Celulosy Np Vortex fiberizer
US3486702A (en) * 1966-11-01 1969-12-30 Papcel Celulosy Np Pulping apparatus
BR8400776A (en) * 1983-02-28 1984-10-02 Black Clawson Co ROTOR PARTICULARLY ADAPTED FOR USE IN THE PAPER MANUFACTURE STOCK PULP AND APPARATUS FOR PAPER MANUFACTURE STOCK PULP
CA1228762A (en) * 1983-05-18 1987-11-03 Joseph W. Couture Pulping apparatus and method
IT8520484V0 (en) * 1985-01-14 1985-01-14 Ica Spa SPAPOLATORE FOR PAPER AND / OR SIMILAR WASTE PRODUCTS.

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Publication number Publication date
DE3743247C2 (en) 1989-12-21
ES2021812B3 (en) 1991-11-16
ATE62286T1 (en) 1991-04-15
DE3862292D1 (en) 1991-05-08
EP0321665A1 (en) 1989-06-28
DE3743247A1 (en) 1989-06-29

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