EP1312712B1 - Method and container for stacking high consistency pulp - Google Patents
Method and container for stacking high consistency pulp Download PDFInfo
- Publication number
- EP1312712B1 EP1312712B1 EP02022093A EP02022093A EP1312712B1 EP 1312712 B1 EP1312712 B1 EP 1312712B1 EP 02022093 A EP02022093 A EP 02022093A EP 02022093 A EP02022093 A EP 02022093A EP 1312712 B1 EP1312712 B1 EP 1312712B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- volume
- rotor
- paper stock
- consistency
- screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/04—Flat screens
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/28—Tanks for storing or agitating pulp
Definitions
- the invention relates to a method according to the preamble of claim 1 and to a container according to the preamble of claim 12.
- Processes of this type are used to dry already dissolved pulp having a dry content, e.g. B. is between 20 and 40%, to be stacked so that it remains in this state for a desired residence time to z. B. to stock the pulp or to run a chemical reaction.
- a container is used for receiving the paper pulp. It is known that a minimum residence time is required in many chemical reactions, and there are cases in which the residence time must not be exceeded or exceeded, ie should be within a certain range.
- a typical application is the bleaching of high consistency pulp. Basically, a higher consistency is sought in order firstly to keep the required volume as low as possible and secondly to favor the effectiveness of the chemical reaction. In general, a temperature is set well above that of the environment.
- the paper pulp in the stack consistency is not pumpable, which makes it difficult to handle. For this reason, the paper pulp is diluted at least to the extent that it is pumpable after the chemical reaction. This dilution is often done outside the container, as dilution within the container can cause reliability issues.
- DE-OS 35 22 395 C1 shows a storage container (tower) for waste paper. This is used for the chemical treatment of soiled undissolved waste paper.
- the method therefore aims to pretreat the raw material recovered as wastepaper chemically and in a highly consistent state so that it can subsequently be processed with a dissolving rotor arranged in the container bottom.
- the storage container described and the resolving rotor are tuned to the unresolved, so still to be dissolved raw material and designed accordingly.
- a controlled dilution flow is produced below the high-consistency paper pulp, wherein a suspension is formed and pumped out (in particular continuously) by the sieving device. Since the sieve device is provided with a rotor, it is avoided that it clogged. In cases in which the dissolution of highly consistent collections of substances from the area above the suspension can not be avoided, their circulation takes place with the cooperation of the rotor until they have diluted with water and dissolved again. Such a redissolution Although it requires only small forces, but it is necessary because otherwise difficulties can occur in the material pumps. In order to apply the forces required for re-dissolution, the rotor, which moves in close proximity to the sieve for sieve-free operation, is very well suited.
- suspension is supported by the helical spiral arranged in front of the rotor. It can simply be placed on the rotor so that it is driven by it.
- the axial conveying action of the screw flight is directed to guide the suspension perpendicular to and away from the screen surface. As a result, shear and friction forces are generated, which are gentle and yet strong enough for the intended here dissolution process.
- Fig. 1 shows the lower part of a container for stacking and thinning paper pulp.
- the container is here substantially rotationally symmetrical with a vertical center line and contains a first volume 1 (only partially drawn) and a second volume 2.
- the first volume 1 is used to hold the high-consistency paper pulp which - as already mentioned - stacked therein or treated with chemicals becomes.
- Between the two parts of the container is a frusto-conical transition, whereby the flow cross-sectional area in the downstream direction is reduced. This results in a large stack volume and prevents the high consistency paper pulp from being uncontrollable sliding down.
- the boundary 10 between the high-consistency pulp and the pulp diluted in the second volume 2 is indicated by dashed lines.
- Dilution water W is supplied through laterally attached dilution water pipes 9 and 9 ', respectively.
- the existing in the second volume 2 suspension is offset by a rotor 4 in a circulation flow 3, which is merely indicated here by two arrows.
- the rotor 4 belongs to a sieve device 13, which has a sieve 5.
- the sieve 5 contains openings 6, which can pass through a part of the paper pulp material moved in the second volume 2 as a suspension S, which is then removed via the accept stub 11.
- the rotor 4 is here designed, for example, as a vane rotor, which is moved in the immediate vicinity of the screen 5, ie at a distance of between 1 and 10 mm.
- the vane rotor In addition to keeping the screen 5 free, the vane rotor also serves to generate a recirculation flow which, like a pumpling impeller, centrally aspirates and radially accelerates the fluid. This movement is also superimposed on a pure rotational movement, which can not be shown here in the side view, but will be discussed later.
- the spiral screw 7 is arranged in front of the rotor 4, i. on its side not facing the wire 5. It is here on the rotor 4 concentrically fixed with this, so it rotates at the same rotational frequency. It is designed so that it generates a flow 8 by its rotational movement, which promotes the suspension in the direction of the axis of the screw helix 7 and away from the wire 5. In cooperation with the countercurrent circulation flow 3, vortex flows 8 'are formed with the already mentioned positive effects.
- the addition of the dilution water W may e.g. take place through the feed tube 9 in the thickened pulp or through the feed tube 9 'in the region of the circulation flow 3, immediately before it reaches the limit 10.
- Fig. 2 shows the lower part of the container in an external view, which is offset from that in Fig. 1 by 90 °. It essentially shows the outer part of the Sieve device 13 and the Gutstoffstutzen 11 for the diverted suspension S.
- a removable cover 12 drawn, which covers a man-hole, which facilitates the maintenance and any repairs in this area.
- the direction of rotation is apparent from the movement arrow 15, which refers to a part of the screw helix, which faces the viewer of this figure.
- a flow 8 which transported away the suspension in the direction of the axis of this screw helix of the wire 5.
- the production of such a spiral screw is known per se. You can use it e.g. generate by welding a helical surface 16 on a core 17. But that's just an example.
- the rotor 4 may advantageously have a number of vanes 18 which, as a result of their rotation, produce a conveying action from radially inward to radially outward. Hydraulically, this is comparable to the effect of a centrifugal pump.
- the sieve 5 is designed as a flat annular disc, therefore easy to manufacture and save space.
- the second volume 2 can be formed by a horizontal cylinder, on whose cylinder wall the screening device 13 is mounted.
- the circulation flow 3 can develop particularly favorably in the circumferential direction, which possibly favors the detachment of the high-consistency pulp at the boundary 10.
- the circulation flow 3 also contains a rotation component 3 ', which has substantially the same center line as the rotor 4.
- a horizontal cylinder is used for the volume 2, at its front side rotor 4 and screw helix 7 are arranged.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Accessories For Mixers (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Stackable Containers (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren gemäß dem Oberbegriff des Anspruchs 1 und auf einen Behälter gemäß dem Oberbegriff des Anspruchs 12.The invention relates to a method according to the preamble of
Verfahren dieser Art werden angewendet, um bereits aufgelösten Papierfaserstoff mit einem Trockengehalt, der z. B. zwischen 20 und 40 % liegt, so zu stapeln, dass er über eine gewünschte Verweilzeit in diesem Zustand verbleibt, um z. B. den Faserstoff zu bevorraten oder eine chemische Reaktion ablaufen zu lassen. In der Regel wird dabei ein Behälter zur Aufnahme des Papierfaserstoffes verwendet. Bekanntlich ist bei vielen chemischen Reaktionen eine Mindestverweilzeit erforderlich, wobei es auch Fälle gibt, bei denen die Verweilzeit weder unter- noch überschritten werden darf, also innerhalb einer bestimmten Bandbreite liegen sollte. Ein typischer Anwendungsfall ist die Bleiche von hochkonsistentem Papierfaserstoff. Grundsätzlich wird dabei eine höhere Konsistenz angestrebt, um erstens das benötigte Volumen so gering wie möglich zu halten und zweitens die Effektivität der chemischen Reaktion zu begünstigen. In der Regel wird auch eine Temperatur deutlich über der der Umgebung eingestellt.Processes of this type are used to dry already dissolved pulp having a dry content, e.g. B. is between 20 and 40%, to be stacked so that it remains in this state for a desired residence time to z. B. to stock the pulp or to run a chemical reaction. As a rule, a container is used for receiving the paper pulp. It is known that a minimum residence time is required in many chemical reactions, and there are cases in which the residence time must not be exceeded or exceeded, ie should be within a certain range. A typical application is the bleaching of high consistency pulp. Basically, a higher consistency is sought in order firstly to keep the required volume as low as possible and secondly to favor the effectiveness of the chemical reaction. In general, a temperature is set well above that of the environment.
In den meisten Fällen ist der Papierfaserstoff in der Stapelkonsistenz nicht pumpfähig, was seine Handhabung erschwert. Aus diesem Grunde wird der Papierfaserstoff nach Ablauf der chemischen Reaktion mindestens so weit verdünnt, dass er pumpfähig ist. Dieses Verdünnen erfolgt oft außerhalb des Behälters, da die Verdünnung innerhalb des Behälters zu Problemen der Betriebssicherheit führen kann.In most cases, the paper pulp in the stack consistency is not pumpable, which makes it difficult to handle. For this reason, the paper pulp is diluted at least to the extent that it is pumpable after the chemical reaction. This dilution is often done outside the container, as dilution within the container can cause reliability issues.
Aus der DE 198 26 879 A1 ist ein Verfahren bekannt, bei dem auch die oben genannte Verdünnung innerhalb des Stapelbehälters erfolgt. Das bekannte Verfahren ist besonders wirksam, wenn in dem Verdünnungsbereich des Behälters zwei verschiedene Rotoren zusammenwirken. Dieser zusätzliche Aufwand ist jedoch nicht in allen Fällen möglich oder zweckmäßig. Auch fehlt in vielen Fällen der Platz für den zweiten Antrieb.From DE 198 26 879 A1 a method is known, in which also the above-mentioned dilution takes place within the stacking container. The known method is particularly effective when two different rotors co-operate in the dilution zone of the container. However, this additional effort is not possible or expedient in all cases. Also missing in many cases, the space for the second drive.
Die DE-OS 35 22 395 C1 zeigt einen Lagerbehälter (Turm) für Altpapier. Dieser dient der chemischen Behandlung von verschmutztem unaufgelösten Altpapier. Das Verfahren zielt also darauf, den als Altpapier angefallenen Rohstoff zunächst chemisch und in hochkonsistentem Zustand so vorzubehandeln, dass er anschließend mit einem im Behälterboden angeordneten Auflöserotor bearbeitet werden kann. Dabei sind der beschriebene Lagerbehälter und der Auflöserotor auf den nicht aufgelösten, also noch aufzulösenden Rohstoff abgestimmt und entsprechend ausgestaltet.DE-OS 35 22 395 C1 shows a storage container (tower) for waste paper. This is used for the chemical treatment of soiled undissolved waste paper. The method therefore aims to pretreat the raw material recovered as wastepaper chemically and in a highly consistent state so that it can subsequently be processed with a dissolving rotor arranged in the container bottom. In this case, the storage container described and the resolving rotor are tuned to the unresolved, so still to be dissolved raw material and designed accordingly.
In der EP 0 475 669 B1 wird ein Stapelbehälter gezeigt, in dessen Bodenbereich eine Verdünnung durch Zufuhr von Wasser und Vermischung mit Hilfe eines Propellers erfolgt. Dieses Vorgehen führt zwar dazu, dass sich eine pumpfähige Suspension herstellen lässt, diese ist aber sehr ungleichmäßig, so dass z.B. vorgeschlagen wird, Pumpen an verschiedenen Stellen anzusetzen, die verschiedene Stoffdichten der Suspension vertragen.In EP 0 475 669 B1, a stacking container is shown, in the bottom region of which a dilution takes place by supplying water and mixing with the aid of a propeller. Although this procedure leads to the fact that a pumpable suspension can be produced, this is very uneven, so that e.g. It is proposed to apply pumps at different locations which tolerate different substance densities of the suspension.
Es ist Aufgabe der vorliegenden Erfindung, ein Verfahren und einen Behälter zu schaffen, mit denen sich eine zuverlässige Möglichkeit zum Stapeln des hochkonsistenten Papierfaserstoffes bietet, wobei gleichzeitig das Verdünnen und Abpumpen mit einfachen und platzsparenden Mitteln möglich gemacht werden soll.It is an object of the present invention to provide a method and a container with which a reliable way to stack the high-consistency paper pulp offers, while the dilution and pumping is to be made possible with simple and space-saving means.
Diese Aufgabe wird durch im Kennzeichen des Anspruchs 1 bzw. Anspruchs 12 genannten Merkmale erfüllt.This object is achieved by features mentioned in the characterizing part of
Mit Hilfe des erfindungsgemäßen Verfahrens wird eine kontrollierte Verdünnungsströmung unterhalb des hochkonsistenten Papierfaserstoffes erzeugt, wobei eine Suspension gebildet und durch die Siebvorrichtung ( insbesondere kontinuierlich) abgepumpt wird. Da die Siebvorrichtung mit einem Rotor versehen ist, wird vermieden, dass sie verstopft. In den Fällen, in denen das Herauslösen von hochkonsistenten Stoffansammlungen aus dem über der Suspension liegenden Bereich nicht vermieden werden kann, erfolgt deren Zirkulation unter Mitwirkung des Rotors so lange, bis sie sich mit Wasser verdünnt und wieder aufgelöst haben. Eine solche Wiederauflösung erfordert zwar nur geringe Kräfte, sie ist aber erforderlich, da sonst bei den Stoffpumpen Schwierigkeiten auftreten können. Zur Aufbringung der bei der Wiederauflösung benötigten Kräfte ist der Rotor, der sich zur Siebfreihaltung in dichter Nähe zum Sieb bewegt, sehr gut geeignet.With the aid of the method according to the invention, a controlled dilution flow is produced below the high-consistency paper pulp, wherein a suspension is formed and pumped out (in particular continuously) by the sieving device. Since the sieve device is provided with a rotor, it is avoided that it clogged. In cases in which the dissolution of highly consistent collections of substances from the area above the suspension can not be avoided, their circulation takes place with the cooperation of the rotor until they have diluted with water and dissolved again. Such a redissolution Although it requires only small forces, but it is necessary because otherwise difficulties can occur in the material pumps. In order to apply the forces required for re-dissolution, the rotor, which moves in close proximity to the sieve for sieve-free operation, is very well suited.
Unterstützt wird die Suspensionsbildung durch die vor dem Rotor angeordnete Schneckenwendel. Sie kann einfach auf den Rotor aufgesetzt sein, so dass sie von diesem angetrieben wird. In der bevorzugten Ausführungsform ist die axiale Förderwirkung des Schneckenwendels so gerichtet, dass sie die Suspension rechtwinkelig zur Siebfläche und von dieser weg führt. Dadurch werden Scher- und Reibungskräfte erzeugt, die schonend sind und doch stark genug für den hier beabsichtigten Auflösevorgang.The formation of suspension is supported by the helical spiral arranged in front of the rotor. It can simply be placed on the rotor so that it is driven by it. In the preferred embodiment, the axial conveying action of the screw flight is directed to guide the suspension perpendicular to and away from the screen surface. As a result, shear and friction forces are generated, which are gentle and yet strong enough for the intended here dissolution process.
Die Erfindung und ihre Vorteile werden erläutert anhand von Zeichnungen. Dabei zeigen:
- Fig. 1
- einen Behälter zur Ausführung des erfindungsgemäßen Verfahrens, geschnitten in Seitenansicht;
- Fig. 2
- eine andere Seitenansicht des Gegenstandes der Fig. 1;
- Fig. 3
- den Bereich des Rotors etwas detaillierter;
- Fig. 4 und 5
- je eine weitere Variante mit geänderter Behälterform.
- Fig. 1
- a container for carrying out the method according to the invention, cut in side view;
- Fig. 2
- another side view of the article of FIG. 1;
- Fig. 3
- the area of the rotor in more detail;
- 4 and 5
- depending on another variant with changed container shape.
Alle Figuren deuten die zur Durchführung des Verfahrens verwendeten Vorrichtungen lediglich an, ohne konstruktive Details zu offenbaren.All figures merely suggest the devices used to carry out the method without disclosing design details.
Fig. 1 zeigt den unteren Teil eines Behälters zum Stapeln und Verdünnen von Papierfaserstoff. Der Behälter ist hier im Wesentlichen rotationssymmetrisch mit senkrechter Mittellinie und enthält ein erstes Volumen 1 (nur teilweise gezeichnet) und ein zweites Volumen 2. Das erste Volumen 1 dient der Aufnahme des hochkonsistenten Papierfaserstoffs, welcher darin - wie bereits erwähnt - gestapelt oder mit Chemikalien behandelt wird. Zwischen den beiden Teilen des Behälters ist ein kegelstumpfförmiger Übergang, wodurch die Strömungsquerschnittsfläche in stromabwärtiger Richtung verkleinert wird. Das ergibt ein großes Stapelvolumen und hindert den hochkonsistenten Papierfaserstoff daran, unkontrollierbar herabzurutschen. Die Grenze 10 zwischen dem hochkonsistenten Faserstoff und dem im zweiten Volumen 2 verdünnten Faserstoff ist gestrichelt angedeutet. Dabei handelt es sich nicht um eine scharf definierte Fläche, da sie sich - je nach Betriebszustand - ständig verändert. Verdünnungswasser W wird durch seitlich angebrachte Verdünnungswasserrohre 9 bzw. 9' zugeführt. Die im zweiten Volumen 2 vorhandene Suspension wird durch einen Rotor 4 in eine Zirkulationsströmung 3 versetzt, welche hier durch zwei Pfeile lediglich angedeutet ist. Der Rotor 4 gehört zu einer Siebvorrichtung 13, welche ein Sieb 5 aufweist. Das Sieb 5 enthält Öffnungen 6, die ein Teil des im zweiten Volumen 2 bewegten Papierfaserstoffes als Suspension S passieren kann, die dann über den Gutstoffstutzen 11 abgeführt wird. Der Rotor 4 ist hier z.B. als Flügelrotor ausgebildet, der in unmittelbarer Nähe des Siebes 5, d.h. in einem Abstand zwischen 1 und 10 mm, entlang bewegt wird. Neben der Freihaltung des Siebes 5 dient der Flügelrotor auch dazu, eine Umwälzströmung zu erzeugen, welche ähnlich wie bei einem Pumplaufrad die Flüssigkeit zentral ansaugt und radial beschleunigt. Dieser Bewegung überlagert sich außerdem eine reine Rotationsbewegung, die hier in der Seitenansicht nicht dargestellt werden kann, auf die aber später noch eingegangen wird.Fig. 1 shows the lower part of a container for stacking and thinning paper pulp. The container is here substantially rotationally symmetrical with a vertical center line and contains a first volume 1 (only partially drawn) and a
Die Schneckenwendel 7 ist vor dem Rotor 4 angeordnet, d.h. auf dessen nicht dem Sieb 5 zugewandter Seite. Sie ist hier auf dem Rotor 4 konzentrisch mit diesem befestigt, dreht also mit der gleichen Drehfrequenz. Sie ist so ausgebildet, dass sie durch ihre Drehbewegung eine Strömung 8 erzeugt, die die Suspension in Richtung der Achse der Schneckenwendel 7 und weg vom Sieb 5 fördert. Im Zusammenwirken mit der dazu gegensinnigen Zirkulationsströmung 3 bilden sich Wirbelströmungen 8' aus mit den bereits erwähnten positiven Wirkungen.The
Die Zugabe des Verdünnungswassers W kann z.B. durch das Zugaberohr 9 in den eingedickten Faserstoff erfolgen oder durch das Zugaberohr 9' in den Bereich der Zirkulationsströmung 3, unmittelbar bevor sie an die Grenze 10 gelangt.The addition of the dilution water W may e.g. take place through the
Fig. 2 zeigt den unteren Teil des Behälters in einer Ansicht von außen, die gegenüber der in der Fig. 1 um 90° versetzt ist. Sie zeigt im Wesentlichen den außen liegenden Teil der Siebvorrichtung 13 sowie den Gutstoffstutzen 11 für die ausgeleitete Suspension S. Hier ist auch ein herausnehmbarer Deckel 12 gezeichnet, der ein Mann-Loch abdeckt, welches die Wartung und eventuelle Reparaturen in diesem Bereich erleichtert.Fig. 2 shows the lower part of the container in an external view, which is offset from that in Fig. 1 by 90 °. It essentially shows the outer part of the
Um die Strömungsvorgänge im Bereich von Schneckenwendel und Rotor etwas besser darzustellen zu können, ist in Fig. 3 dieser Bereich noch einmal dargestellt, wobei hier allerdings wiederum keine konstruktiven Details entnehmbar sind. Durch das nur teilweise und ohne Sieböffnungen dargestellte Sieb 5 ist eine Welle 14 hindurchgeführt, die hier sowohl den Rotor 4 als auch die Schneckenwendel 7 antreibt. Die axiale Höhe H der Schneckenwendel 7, mit der diese über den Rotor 4 hervorsteht, entspricht vorzugsweise mindestens 30 % des Außendurchmessers D des Rotors 4. Der Außendurchmesser D1 der Schneckenwendel 7 kann so gewählt werden, dass er mindestens 20 % des Außendurchmessers D des Rotors 4 beträgt. Die Drehrichtung geht aus dem Bewegungspfeil 15 hervor, der sich auf einen Teil der Schneckenwendel bezieht, der dem Betrachter dieser Figur zugewandt ist. Bei einer solchen Drehrichtung bildet sich auf Grund der Schneckengeometrie eine Strömung 8 aus, die die Suspension in Richtung der Achse dieser Schneckenwendel von dem Sieb 5 wegtransportiert. Die Herstellung einer solchen Schneckenwendel ist an sich bekannt. Man kann sie z.B. dadurch erzeugen, dass eine schraubenförmige Fläche 16 auf einen Kern 17 aufgeschweißt wird. Das ist aber nur als Beispiel anzusehen. Der Rotor 4 kann mit Vorteil eine Anzahl von Flügeln 18 aufweisen, die in Folge ihrer Rotation eine Förderwirkung von radial innen nach radial außen erzeugen. Hydraulisch ist das mit der Wirkung einer Kreiselpumpe vergleichbar. Das Sieb 5 ist als ebene ringförmige Scheibe ausgeführt, daher einfach herzustellen und platzsparend.In order to be able to represent the flow processes in the area of screw helix and rotor a little better, this area is shown again in FIG. 3, whereby, however, again no design details can be taken from here. Through the
Während der in Fig. 1 und 2 gezeigte Behälter im Wesentlichen eine zylindrische Form mit dazwischen eingesetztem Kegelstumpf aufweist, kann - wie Fig. 4 zeigt - das zweite Volumen 2 durch einen liegenden Zylinder gebildet werden, an dessen Zylinderwand die Siebvorrichtung 13 angebaut ist. Dadurch kann sich die Zirkulationsströmung 3 in Umfangsrichtung besonders günstig ausbilden, was eventuell die Ablösung des hochkonsistenten Faserstoffes an der Grenze 10 begünstigt.While the container shown in FIGS. 1 and 2 has substantially a cylindrical shape with a truncated cone inserted therebetween, as shown in FIG. 4, the
Wie schon erwähnt, enthält die Zirkulationsströmung 3 auch eine Rotationskomponente 3', die im Wesentlichen dieselbe Mittellinie hat wie der Rotor 4. Bei der in Fig. 5 gezeigten Ausführungsform wird ein liegender Zylinder für das Volumen 2 verwendet, an dessen Stirnseite Rotor 4 und Schneckenwendel 7 angeordnet sind.As already mentioned, the
Claims (17)
- A method for stacking and diluting paper stock which is stacked in the high-consistency state in a first volume (1) for a defined dwell time and then is transferred into a second volume (2) which adjoins the first one downstream and in which the paper stock is diluted at least to a pumpable consistency and is withdrawn as a suspension (S) through a screen (5),
wherein a circulation flow (3) is generated in the second volume (2) which carries away the high-consistency paper stock found at the edge of the first volume (1), dilutes it and supplies it to the screen (5) which is kept free with a rotating rotor (4),
characterised in that
using a screw coil (7) located immediately in front of the rotor (4), a flow (8) is produced which runs in the axial direction of the screw coil (7) and carries the suspension (S) away from the screen (5). - A method according to Claim 1,
characterised in that
the screw coil (7) is moved at the same rotational frequency as the rotor (4). - A method according to Claim 2,
characterised in that
the screw coil (7) is connected to the rotor (4). - A method according to Claim 1, 2 or 3,
characterised in that
the screw coil (7) is arranged such that its centre line is horizontal. - A method according to Claim 1, 2, 3 or 4,
characterised in that
the high-consistency paper stock has a crumbly structure. - A method according to Claim 1, 2, 3, 4 or 5,
characterised in that
the high-consistency paper stock is waste paper which is pulped, purified and then thickened again. - A method according to one of the preceding claims,
characterised in that
the high-consistency paper stock in the first volume (1) has a solids content of 20 to 40%. - A method according to one of the preceding claims,
characterised in that
the paper stock from the second volume (2) is withdrawn with a solids content of at most 8%. - A method according to one of the preceding claims,
characterised in that
the circulation flow (3) is generated by the rotor (4). - A method according to one of the preceding claims,
characterised in that
the paper stock of the first volume (1) is conveyed to the second volume (2) by a gradually narrowing cross-sectional flow area, the downstream cross-sectional flow area being at most 80% of the upstream one. - A method according to one of the preceding claims,
characterised in that
the second volume (2) is located beneath the first volume (1). - A vessel for performing the method according to one of Claims 3 to 11, which contains in its upper region a first volume (1) for receiving the paper stock in the high-consistency state and in its lower region a second volume (2), in which means for hydraulic circulation, dilution and discharging of the diluted paper stock are present and also a screening device (13) which contains at least one screen (5) and at least one rotor (4), and that the dilute paper stock can be withdrawn through the screen (5),
characterised in that
in the second volume (2) a screw coil (7) is attached to the rotor (4), which coil, owing to its geometry, conveys away from the screen (5) in the axial direction at operating speed. - A vessel according to Claim 12,
characterised in that
the direction of conveyance of the screw coil (7) is horizontal. - A vessel according to one of Claims 12 or 13,
characterised in that
the screen (5) is a flat plate provided with openings (6). - A vessel according to one of Claims 12 to 14,
characterised in that
the axial height (H) of the screw coil (7) above the rotor (4) corresponds to at least 30% of the external diameter (D) of the rotor (4). - A vessel according to one of Claims 12 to 15,
characterised in that
the external diameter (D1) of the screw coil (7) corresponds to at least 20% of the external diameter (D) of the rotor (4). - A vessel according to one of Claims 12 to 16,
characterised in that
the screw coil (7) is provided with screw-like surfaces (16) which have an angle of between 5 and 30° at the periphery to the surface normal to the axis.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10156201 | 2001-11-15 | ||
| DE10156201A DE10156201C1 (en) | 2001-11-15 | 2001-11-15 | To process high consistency paper fiber materials, an initial high consistency volume is held in a stack for a dwell time, to be taken off at the bottom by a circulation flow for dilution and delivery as a suspension |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1312712A2 EP1312712A2 (en) | 2003-05-21 |
| EP1312712A3 EP1312712A3 (en) | 2004-01-02 |
| EP1312712B1 true EP1312712B1 (en) | 2006-11-22 |
Family
ID=7705899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02022093A Expired - Lifetime EP1312712B1 (en) | 2001-11-15 | 2002-10-02 | Method and container for stacking high consistency pulp |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6986829B2 (en) |
| EP (1) | EP1312712B1 (en) |
| JP (1) | JP2003193390A (en) |
| AT (1) | ATE346183T1 (en) |
| DE (2) | DE10156201C1 (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006055316B3 (en) * | 2006-11-23 | 2008-01-31 | Voith Patent Gmbh | Sieve for the recovery of fibers from recycled paper has main cylinder section inclined at an angle to that of the rotor |
| FI122950B (en) * | 2007-10-26 | 2012-09-14 | Upm Kymmene Corp | Pulp tank and pulp unloading procedure |
| US8869988B2 (en) * | 2008-05-08 | 2014-10-28 | M-I L.L.C. | Cooling and classifying apparatus for pelletized product processing |
| US8895291B2 (en) | 2010-10-08 | 2014-11-25 | Terumo Bct, Inc. | Methods and systems of growing and harvesting cells in a hollow fiber bioreactor system with control conditions |
| US9617506B2 (en) | 2013-11-16 | 2017-04-11 | Terumo Bct, Inc. | Expanding cells in a bioreactor |
| EP3613841B1 (en) | 2014-03-25 | 2022-04-20 | Terumo BCT, Inc. | Passive replacement of media |
| CN106715676A (en) | 2014-09-26 | 2017-05-24 | 泰尔茂比司特公司 | Scheduled feed |
| WO2017004592A1 (en) | 2015-07-02 | 2017-01-05 | Terumo Bct, Inc. | Cell growth with mechanical stimuli |
| US11965175B2 (en) | 2016-05-25 | 2024-04-23 | Terumo Bct, Inc. | Cell expansion |
| US11104874B2 (en) | 2016-06-07 | 2021-08-31 | Terumo Bct, Inc. | Coating a bioreactor |
| US11685883B2 (en) | 2016-06-07 | 2023-06-27 | Terumo Bct, Inc. | Methods and systems for coating a cell growth surface |
| US11702634B2 (en) | 2017-03-31 | 2023-07-18 | Terumo Bct, Inc. | Expanding cells in a bioreactor |
| US11624046B2 (en) | 2017-03-31 | 2023-04-11 | Terumo Bct, Inc. | Cell expansion |
| WO2019175894A1 (en) * | 2018-03-13 | 2019-09-19 | Mahindra & Mahindra Limited | Concealed air vent apparatus in vehicle and a method thereof |
| USD891852S1 (en) | 2018-12-20 | 2020-08-04 | Hall Of Fame Innovations Llc | Cooking pan |
| USD878860S1 (en) | 2018-12-20 | 2020-03-24 | Smoke Staxx Pans Llc | Cooking rack |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3293117A (en) * | 1963-03-27 | 1966-12-20 | Improved Machinery Inc | High density pulp mixing |
| FR2441681A1 (en) * | 1978-11-17 | 1980-06-13 | Lamort E & M | IMPROVEMENTS IN PROCESSES AND APPARATUS FOR DISINTEGRATION OF CELLULOSIC MATERIALS |
| CH654360A5 (en) * | 1981-12-10 | 1986-02-14 | Escher Wyss Gmbh | METHOD FOR SOLVING WASTE PAPER IN THE THICKENING AREA. |
| DE3522395C1 (en) * | 1985-06-22 | 1986-11-20 | J.M. Voith Gmbh, 7920 Heidenheim | Process and arrangement for processing waste paper |
| FR2585385B1 (en) * | 1985-07-26 | 1987-10-30 | Lamort E & M | PROCESS AND APPARATUS FOR PREPARING AND PRIMARY SORTING OF PAPER PULP |
| FI79361B (en) * | 1988-01-05 | 1989-08-31 | Ahlstroem Oy | FOERFARANDE OCH APPARATUR FOER UNDERLAETTANDE AV UTTOEMNING AV FALLROER ELLER LIKNANDE OCH BEHANDLING AV MASSA I SAGDA UTRYMME. |
| FR2663966A1 (en) * | 1990-07-02 | 1992-01-03 | Lamort Em | SORTING DEVICE FOR A MIXTURE OF PAPER PULP AND CONTAMINANTS. |
| FI85392C (en) * | 1990-09-05 | 1992-04-10 | Ahlstroem Oy | ANORDINATION FROM THE URL TO THE MASSAGE. |
| US5538597A (en) * | 1990-09-05 | 1996-07-23 | A. Ahlstrom Corporation | Apparatus for the discharge of a mass tower |
| DE19826879B4 (en) * | 1998-06-17 | 2005-06-02 | Voith Paper Patent Gmbh | Method and container for stacking high consistency paper pulp |
-
2001
- 2001-11-15 DE DE10156201A patent/DE10156201C1/en not_active Expired - Fee Related
-
2002
- 2002-10-02 EP EP02022093A patent/EP1312712B1/en not_active Expired - Lifetime
- 2002-10-02 DE DE50208763T patent/DE50208763D1/en not_active Expired - Fee Related
- 2002-10-02 AT AT02022093T patent/ATE346183T1/en not_active IP Right Cessation
- 2002-11-13 US US10/292,468 patent/US6986829B2/en not_active Expired - Fee Related
- 2002-11-14 JP JP2002331146A patent/JP2003193390A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE50208763D1 (en) | 2007-01-04 |
| ATE346183T1 (en) | 2006-12-15 |
| EP1312712A2 (en) | 2003-05-21 |
| DE10156201C1 (en) | 2002-10-17 |
| EP1312712A3 (en) | 2004-01-02 |
| JP2003193390A (en) | 2003-07-09 |
| US6986829B2 (en) | 2006-01-17 |
| US20030089471A1 (en) | 2003-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1312712B1 (en) | Method and container for stacking high consistency pulp | |
| DE69129017T3 (en) | BLEACHING PULP AND REACTOR | |
| DE3037119C2 (en) | Device for mixing treatment media into a suspension | |
| DE2917814C2 (en) | Pulpers for the production of paper stock suspensions | |
| DE2518112C2 (en) | Device for treating paper fibers | |
| DE3047013A1 (en) | DISPERSING DEVICE FOR THE TREATMENT OF WASTE PAPER | |
| EP1679403B1 (en) | Pulper for comminuting and suspending papermaking material | |
| DE2526657B2 (en) | PRESSURE SECTION FOR FIBER SUSPENSIONS | |
| DE3606447A1 (en) | SCREEN DEVICE | |
| WO2009077037A1 (en) | Method and device for removing gas, especially air, from flotation foam and use thereof | |
| DE2440393A1 (en) | METHOD AND APPARATUS FOR RECYCLING PAPER FIBERS FROM MATERIALS CONTAINING WASTE PAPER | |
| DE2841958A1 (en) | METHOD AND DEVICE FOR WASHING RAW FIBER MATERIAL DURING COLORING FROM PAPER | |
| EP0279022B1 (en) | Process and installation for pulping paper stock | |
| DE3149135C2 (en) | Device for dissolving waste paper in the thick material area | |
| CH355771A (en) | Method and device for the treatment of substances and mixtures of substances | |
| EP0965682B1 (en) | Method and container for stacking and diluting high consistency pulp | |
| DE4024561C2 (en) | Process and device for processing waste paper | |
| DE3605259C1 (en) | Process and installation for removing color particles from a fiber suspension obtained from waste paper | |
| WO2021043609A1 (en) | Multistage screening device | |
| DE3340858A1 (en) | Process and device for defibrating pretreated waste paper | |
| DE2811821B2 (en) | Apparatus for forming a pulp layer | |
| EP1895047A1 (en) | Method and apparatus for pulping unit | |
| DE102006031904B3 (en) | Paper pulping assembly for paper recovery and recycling has rotor surrounded by ring | |
| EP1130156B1 (en) | Device for separating impurities from fibrous material | |
| DE1461033A1 (en) | Apparatus and method for processing wood pulp and the like. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
| AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
| AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
| 17P | Request for examination filed |
Effective date: 20040702 |
|
| AKX | Designation fees paid |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VOITH PATENT GMBH |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20061122 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061122 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061122 Ref country code: IE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061122 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061122 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061122 |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: GERMAN |
|
| REF | Corresponds to: |
Ref document number: 50208763 Country of ref document: DE Date of ref document: 20070104 Kind code of ref document: P |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070222 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070222 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070222 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070305 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070423 |
|
| NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
| GBV | Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed] |
Effective date: 20061122 |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FD4D |
|
| EN | Fr: translation not filed | ||
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed |
Effective date: 20070823 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061122 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20071025 Year of fee payment: 6 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20071015 Year of fee payment: 6 |
|
| BERE | Be: lapsed |
Owner name: VOITH PATENT G.M.B.H. Effective date: 20071031 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070713 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070223 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071031 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071031 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071031 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071031 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061122 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061122 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061122 Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071002 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20081002 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090501 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061122 |