EP0807709A1 - Apparatus for screening a fibrous suspension - Google Patents

Apparatus for screening a fibrous suspension Download PDF

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Publication number
EP0807709A1
EP0807709A1 EP97104828A EP97104828A EP0807709A1 EP 0807709 A1 EP0807709 A1 EP 0807709A1 EP 97104828 A EP97104828 A EP 97104828A EP 97104828 A EP97104828 A EP 97104828A EP 0807709 A1 EP0807709 A1 EP 0807709A1
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EP
European Patent Office
Prior art keywords
section
cross
sorting
sieve element
inlet side
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97104828A
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German (de)
French (fr)
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EP0807709B1 (en
Inventor
Manfred Duchow
Peter Schweiss
Hans Friedrich
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Voith Paper Fiber and Environmental Solutions GmbH and Co KG
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Voith Sulzer Stoffaufbereitung GmbH
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    • 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
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils
    • 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
    • D21D5/02—Straining or screening the pulp
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the invention relates to a device for sorting fibrous suspension according to the preamble of claim 1.
  • sorting devices are used in the pulp and paper industry, in which the fibrous suspension is treated in a kind of wet screening. In most cases, foreign fibers should be retained on a sieve element due to their size and then separated. The fibers can pass through the sorting openings together with some of the water. In principle, such machines are widely known and are often used.
  • the sieve elements can have a cylindrical structure, then they are called sieve baskets, or they can be made essentially flat, that is, as plate sieves.
  • the strips placed on such screens are mostly intended to protect the screen element from wear. They are therefore often made from particularly wear-resistant material, such as hard metal. In addition to the wear-reducing effect, they can also improve the function of the sorting device. Since such a sorting device has at least one clearing element, which is designed, for example, as a wing and is moved relatively close to the sorting element, additional vortices can be generated by the relative movement, which favors the keeping of the sorting opening. In the case of fibrous material containing specks, the interaction of the clearing element and the strip can achieve an entirely desirable dissolution of the specks. In addition, the strips can be attached in such a way that, together with the clearing element, they deflect the substances rejected at the sorting opening in the direction of the outlet from the sorting device.
  • the sorting cross-section means the narrowest cross-section in the sorting opening, which is known to have the sorting characteristic, i.e. the separation limit of such a sieve element is decisively determined.
  • FIG. 1 schematically shows the part of the sorting device that is essential to the invention.
  • the sieve element 1 drawn in section, which contains a number of sorting openings 2.
  • Two different configurations of such sorting openings are shown by way of example, whereby in reality mostly the same holes are used for one and the same screen element.
  • the illustration is chosen so that the inlet side 4 is at the top, that is to say the suspension is to be guided through the sorting openings 2 from top to bottom. In principle, however, any position is possible.
  • Three strip-shaped elevations 5 are drawn on the inlet side 4.
  • a clearing element 3 is moved relative to the sieve element 1.
  • the sieve element 1 is usually permanently installed and the clearing element 3 e.g.
  • the clearing element On its underside 8, which faces the sieve element, the clearing element has different distances from the inlet side 4 of the sieve element 1. In the running direction at the front, the primary distance a is smaller than behind it the secondary distance b.
  • This sensible embodiment of the invention can favor keeping the sorting openings 2 free, since it generates suction pulses.
  • the clearing wing is given a bead-like reinforcement at that point, which is particularly highly stressed.
  • the broaching element 3 Seen in the direction of movement, has the extension c, which in particularly favorable designs is at least 8 times as long as the secondary distance b. This creates an extensive suction zone under the clearing element, which is useful for keeping the sieve free.
  • the sorting openings 2 on the inlet side 4 have an inlet cross-section 6 which is larger than the actual sorting cross-section 7.
  • the sorting cross-section 7 is known to be the narrowest point of a sorting opening and crucially determines the separation characteristic of the device.
  • the somewhat different sorting openings shown on the right have extensions towards the outlet side. This means, known per se, is intended to further reduce the tendency towards constipation.
  • Fig. 2 the device of Fig. 1 is outlined in supervision.
  • the main thing is the arrangement of the sorting openings 2 and the strip-shaped elevations 5.
  • the arrangement and orientation of these strip-shaped elevations relative to the direction of movement of the rotor can be selected so that pushing away the rejected substances on the strips is promoted by the rotor movement.
  • FIG. 3 shows the conditions in the area of the sorting openings 2 schematically but in somewhat more detail.
  • a sorting opening 2 is shown on the left such that the inlet cross section 6 and the sorting cross section 7 are visible.
  • the measure of the height h is indicated with which the strip-shaped elevations 5 protrude above the inlet side 4 of the sieve element 1.
  • the transition from the inlet cross section 6 to the narrower cross section located downstream can, as shown here, take place in a gradual course of the depth t.
  • FIG. 4 shows a practical form of the sorting device, in which the housing and the volume flows are also visible.
  • the suspension S enters the sorting housing 9 through the inlet connection 10.
  • the housing is divided by the sieve element 1 into two unequal chambers.
  • the clearing element 3 in the form of a drivable vane rotor is moved past the sieve element 1 so closely that blockages of the sorting openings 2 are prevented.
  • What is rejected on the sieve element 1 is discharged through the outlet nozzle 11 and the accept that could pass through the sieve through the accept nozzle 12.
  • the embodiment shown here contains a vertical sieve plate in the operating position in the form of the sieve element 1, but other arrangements are possible , e.g.
  • the sieve element 1 be designed as a horizontal plate; it is also conceivable that additional screen elements are present in the same housing. Furthermore, as already mentioned, the invention can also be applied to cylindrical sieve elements. A graphic representation is not necessary for this, since such devices are well known to the person skilled in the art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

The appts. for sorting fibre suspensions has an expanded flow cross section (6) for the sorting openings (2) on the inflow side (4), with dimensions at least 1.4 times the cross section (7) of the openings (2).

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Sortieren von faserstoffhaltiger Suspension gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for sorting fibrous suspension according to the preamble of claim 1.

Bekanntlich werden in der Zellstoff- und Papierindustrie Sortiervorrichtungen eingesetzt, in denen die faserstoffhaltige Suspension in einer Art Naßsiebung behandelt wird. Dabei sollen in den meisten Fällen faserfremde Verunreinigungen aufgrund ihrer Größe an einem Siebelement zurückgehalten und dann abgeschieden werden. Die Fasern können dabei zusammen mit einem Teil des Wassers die Sortieröffnungen passieren. Grundsätzlich sind solche Maschinen weithin bekannt und werden oft eingesetzt. Die Siebelemente können einen zylindrischen Aufbau haben, dann werden sie Siebkörbe genannt oder sie können im wesentlichen eben, also als Plattensiebe, ausgeführt sein.As is known, sorting devices are used in the pulp and paper industry, in which the fibrous suspension is treated in a kind of wet screening. In most cases, foreign fibers should be retained on a sieve element due to their size and then separated. The fibers can pass through the sorting openings together with some of the water. In principle, such machines are widely known and are often used. The sieve elements can have a cylindrical structure, then they are called sieve baskets, or they can be made essentially flat, that is, as plate sieves.

Die auf solchen Sieben aufgesetzten Leisten sollen zumeist das Siebelement vor Verschleiß schützen. Sie werden daher auch oft aus besonders verschleißfähigem Material, z.B. Hartmetall, hergestellt. Neben der verschleißmindernden Wirkung können sie aber auch die Funktion der Sortiervorrichtung verbessern. Da eine solche Sortiervorrichtung mindestens ein Räumelement hat, das z.B. als Flügel ausgebildet ist und relativ dicht an dem Sortierelement vorbeibewegt wird, können durch die Relativbewegung zusätzliche Wirbel erzeugt werden, die die Freihaltung der Sortieröffnung begünstigt. Bei stippenhaltigem Faserstoff kann durch Zusammenwirkung von Räumelement und Leiste eine durchaus wünschenswerte Auflösung der Stippen erzielt werden. Darüberhinaus können die Leisten so angebracht sein, daß sie zusammen mit dem Räumelement eine Ablenkung der an der Sortieröffnung abgewiesenen Stoffe in Richtung zum Auslauf aus der Sortiervorrichtung bewirken.The strips placed on such screens are mostly intended to protect the screen element from wear. They are therefore often made from particularly wear-resistant material, such as hard metal. In addition to the wear-reducing effect, they can also improve the function of the sorting device. Since such a sorting device has at least one clearing element, which is designed, for example, as a wing and is moved relatively close to the sorting element, additional vortices can be generated by the relative movement, which favors the keeping of the sorting opening. In the case of fibrous material containing specks, the interaction of the clearing element and the strip can achieve an entirely desirable dissolution of the specks. In addition, the strips can be attached in such a way that, together with the clearing element, they deflect the substances rejected at the sorting opening in the direction of the outlet from the sorting device.

Obwohl es schon sehr viele Maßnahmen und Vorschläge gibt, um den Durchsatz und die Wirkung solcher Sortiervorrichtungen zu verbessern, verbleibt nach wie vor die Aufgabe einer weiteren Steigerung des Durchsatzes, ohne dadurch den Sortiereffekt zu verschlechtern.Although there are already many measures and proposals to improve the throughput and the effect of such sorting devices, the task of further increasing the throughput remains without worsening the sorting effect.

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

Es hat sich nämlich gezeigt, daß eine beträchtliche Durchsatzerhöhung möglich ist, wenn die turbulenzerzeugende Wirkung des Räumelementes bei Vorhandensein von leistenförmigen Erhebungen kombiniert wird mit erweiterten Einlaufquerschnitten am Sortierelement, die deutlich über dem Sortierquerschnitt liegen. Mit Sortierquerschnitt ist dabei der engste Querschnitt in der Sortieröffnung gemeint, der bekanntlich die Sortiercharakteristik, d.h. die Trenngrenze eines solchen Siebelementes, entscheidend bestimmt.It has been shown that a considerable increase in throughput is possible if the turbulence-generating effect of the clearing element in the presence of strip-shaped elevations is combined with expanded inlet cross sections on the sorting element, which are significantly above the sorting cross section. The sorting cross-section means the narrowest cross-section in the sorting opening, which is known to have the sorting characteristic, i.e. the separation limit of such a sieve element is decisively determined.

Zwar ist es dem Fachmann seit langem bekannt, daß sich der Durchsatz und die Sicherheit gegen Verstopfungen bei einem Siebelementvergrößern lassen, indem die Sortieröffnungen sich, in Durchströmungsrichtung betrachtet, erweitern. Diese Maßnahme kann zusätzlich zu der erfindungsgemäßen Ausgestaltung des Sortiersiebes erfolgen. Entscheidend und überraschend ist aber, daß auch bei Verengung, in Stromlaufrichtung gesehen, eine Verbesserung des Durchsatzes möglich ist, wenn ein entsprechendes Zusammenwirken von Räumern und aufgesetzten Leisten auf der Zulaufseite des Sortierelementes gewährleistet ist.It has long been known to the person skilled in the art that the throughput and the security against blockages in a screen element can be increased by enlarging the sorting openings when viewed in the direction of flow. This measure can take place in addition to the configuration of the sorting screen according to the invention. It is crucial and surprising, however, that an improvement in the throughput is also possible in the case of a narrowing, as seen in the direction of flow, if a corresponding interaction of clearers and attached strips is ensured on the inlet side of the sorting element.

Die Erfindung wird beschrieben und erläutert anhand von Zeichnungen. Dabei zeigen:

Fig. 1
geschnittene Teilansicht einer erfindungsgemäßen Sortiervorrichtung;
Fig. 2
Aufsicht auf eine erfindungsgemäße Sortiervorrichtung;
Fig. 3
Detail der Sortiervorrichtung;
Fig. 4
schematisch: Seitenansicht einer Sortiervorrichtung.
The invention is described and explained with reference to drawings. Show:
Fig. 1
sectional partial view of a sorting device according to the invention;
Fig. 2
Supervision of a sorting device according to the invention;
Fig. 3
Detail of sorting device;
Fig. 4
schematic: side view of a sorting device.

In der Fig. 1 ist auf schematische Weise der erfindungswesentliche Teil der Sortiervorrichtung dargestellt. Man erkennt das im Schnitt gezeichnete Siebelement 1, welches eine Anzahl von Sortieröffnungen 2 enthält. Dabei sind exemplarisch zwei verschiedene Ausgestaltungen solcher Sortieröffnungen gezeichnet, wobei in der Realität für ein und dasselbe Siebelement zumeist gleiche Löcher verwendet werden. Die Darstellung ist so gewählt, daß die Zulaufseite 4 oben liegt, also die Suspension von oben nach unten durch die Sortieröffnungen 2 geführt werden soll. Grundsätzlich ist aber jede Lage möglich. Auf der Zulaufseite 4 sind drei leistenförmige Erhebungen 5 gezeichnet. Um bei Betrieb der Vorrichtung das Verstopfen der Sortieröffnungen 2 zu verhindern, wird ein Räumelement 3 relativ zum Siebelement 1 bewegt. Dabei wird üblicherweise das Siebelement 1 fest eingebaut und das Räumelement 3 z.B. als Flügelteil eines Rotors angetrieben. Grundsätzlich ist aber auch die kinematische Umkehr denkbar. Das Räumelement hat an seiner Unterseite 8, welche dem Siebelement zugewandt ist, unterschiedliche Abstände zur Zulaufseite 4 des Siebelementes 1. In Laufrichtung vorne ist der primäre Abstand a kleiner als dahinter der sekundäre Abstand b. Diese sinnvolle Ausgestaltung der Erfindung kann das Freihalten der Sortieröffnungen 2 begünstigen, da sie Saugimpulse erzeugt. Ferner erhält dadurch der Räumflügel gerade an der Stelle eine wulstartige Verstärkung, die besonders hoch beansprucht ist. In Bewegungsrichtung gesehen hat das Räumelement 3 die Erstreckung c, die in besonders günstigen Ausführungen mindestens 8 Mal so lang ist wie der sekundäre Abstand b. Dadurch bildet sich eine ausgedehnte Saugzone unter dem Räumelement, die zur Siebfreihaltung dienlich ist.1 schematically shows the part of the sorting device that is essential to the invention. One recognizes the sieve element 1 drawn in section, which contains a number of sorting openings 2. Two different configurations of such sorting openings are shown by way of example, whereby in reality mostly the same holes are used for one and the same screen element. The illustration is chosen so that the inlet side 4 is at the top, that is to say the suspension is to be guided through the sorting openings 2 from top to bottom. In principle, however, any position is possible. Three strip-shaped elevations 5 are drawn on the inlet side 4. In order to prevent the sorting openings 2 from becoming blocked during operation of the device, a clearing element 3 is moved relative to the sieve element 1. The sieve element 1 is usually permanently installed and the clearing element 3 e.g. driven as a wing part of a rotor. In principle, however, kinematic reversal is also conceivable. On its underside 8, which faces the sieve element, the clearing element has different distances from the inlet side 4 of the sieve element 1. In the running direction at the front, the primary distance a is smaller than behind it the secondary distance b. This sensible embodiment of the invention can favor keeping the sorting openings 2 free, since it generates suction pulses. Furthermore, the clearing wing is given a bead-like reinforcement at that point, which is particularly highly stressed. Seen in the direction of movement, the broaching element 3 has the extension c, which in particularly favorable designs is at least 8 times as long as the secondary distance b. This creates an extensive suction zone under the clearing element, which is useful for keeping the sieve free.

Wie in den Ansprüchen beschrieben, weisen die Sortieröffnungen 2 an der Zulaufseite 4 einen Zulaufquerschnitt 6 auf, der größer ist als der eigentliche Sortierquerschnitt 7. Der Sortierquerschnitt 7 ist bekanntlich die engste Stelle einer Sortieröffnung und bestimmt entscheidend die Trenncharakteristik der Vorrichtung. Die etwas variierten, rechts gezeichneten Sortieröffnungen haben zur Auslaufseite hin wiederum Erweiterungen. Dieses an sich bekannte Mittel soll die Verstopfungsneigung weiter reduzieren.As described in the claims, the sorting openings 2 on the inlet side 4 have an inlet cross-section 6 which is larger than the actual sorting cross-section 7. The sorting cross-section 7 is known to be the narrowest point of a sorting opening and crucially determines the separation characteristic of the device. The somewhat different sorting openings shown on the right have extensions towards the outlet side. This means, known per se, is intended to further reduce the tendency towards constipation.

In Fig. 2 ist die Vorrichtung von Fig. 1 in Aufsicht skizziert. Man erkennt zur Hauptsache die Anordnung der Sortieröffnungen 2 und der leistenförmigen Erhebungen 5. Die Anordnung und Ausrichtung dieser leistenförmigen Erhebungen relativ zur Bewegungsrichtung des Rotors kann so gewählt werden, daß ein Wegschieben der abgewiesenen Stoffe an den Leisten durch die Rotorbewegung begünstigt wird.In Fig. 2 the device of Fig. 1 is outlined in supervision. The main thing is the arrangement of the sorting openings 2 and the strip-shaped elevations 5. The arrangement and orientation of these strip-shaped elevations relative to the direction of movement of the rotor can be selected so that pushing away the rejected substances on the strips is promoted by the rotor movement.

Fig. 3 zeigt die Verhältnisse im Bereich der Sortieröffnungen 2 schematisch aber noch etwas detaillierter. Links ist eine Sortieröffnung 2 so dargestellt, daß der Zulaufquerschnitt 6 und der Sortierquerschnitt 7 sichtbar sind. Ferner ist das Maß der Höhe h angegeben, mit der die leistenförmigen Erhebungen 5 über der Zulaufseite 4 des Siebelementes 1 übersteht. Der Übergang vom Zulaufquerschnitt 6 zum stromab gelegenen engeren Querschnitt kann, wie hier gezeigt, im allmählichen Verlauf der Tiefe t erfolgen.3 shows the conditions in the area of the sorting openings 2 schematically but in somewhat more detail. A sorting opening 2 is shown on the left such that the inlet cross section 6 and the sorting cross section 7 are visible. Furthermore, the measure of the height h is indicated with which the strip-shaped elevations 5 protrude above the inlet side 4 of the sieve element 1. The transition from the inlet cross section 6 to the narrower cross section located downstream can, as shown here, take place in a gradual course of the depth t.

Der Vollständigkeit halber ist in Fig. 4 eine praktisch ausgeführte Form der Sortiervorrichtung gezeigt, bei der auch das Gehäuse und die Volumenströme sichtbar sind. Die Suspension S tritt durch den Einlaufstutzen 10 in das Sortiergehäuse 9 ein. Das Gehäuse wird durch das Siebelement 1 in zwei ungleich große Kammern unterteilt. Auf der Zulaufseite 4 des Siebelementes 1 wird das Räumelement 3 in Form eines antreibbaren Flügelrotors so dicht an dem Siebelement 1 vorbeibewegt, daß Verstopfungen der Sortieröffnungen 2 verhindert werden. Das am Siebelement 1 Abgewiesene wird durch den Auslaufstutzen 11 abgeleitet und der Gutstoff, der das Sieb passieren konnte, durch den Gutstoffstutzen 12. Die hier gezeigte Ausführungsform enthält in der Betriebslage eine senkrecht stehende Siebplatte in Form des Siebelementes 1, es sind aber weitere Anordnungen möglich, z.B. kann das Siebelement 1 als waagerechte Platte ausgeführt sein; es ist auch denkbar, daß weitere Siebelemente im selben Gehäuse vorhanden sind. Darüberhinaus ist, wie bereits erwähnt, die Erfindung auch auf zylindrisch ausgestaltete Siebelemente anwendbar. Eine zeichnerische Darstellung hierfür ist nicht erforderlich, da solche Vorrichtungen dem Fachmann hinlänglich bekannt sind.For the sake of completeness, FIG. 4 shows a practical form of the sorting device, in which the housing and the volume flows are also visible. The suspension S enters the sorting housing 9 through the inlet connection 10. The housing is divided by the sieve element 1 into two unequal chambers. On the inlet side 4 of the sieve element 1, the clearing element 3 in the form of a drivable vane rotor is moved past the sieve element 1 so closely that blockages of the sorting openings 2 are prevented. What is rejected on the sieve element 1 is discharged through the outlet nozzle 11 and the accept that could pass through the sieve through the accept nozzle 12. The embodiment shown here contains a vertical sieve plate in the operating position in the form of the sieve element 1, but other arrangements are possible , e.g. can the sieve element 1 be designed as a horizontal plate; it is also conceivable that additional screen elements are present in the same housing. Furthermore, as already mentioned, the invention can also be applied to cylindrical sieve elements. A graphic representation is not necessary for this, since such devices are well known to the person skilled in the art.

Claims (13)

Vorrichtung zum Sortieren von wässeriger faserstoffhaltiger Suspension (S) mit Hilfe eines Siebelementes (1), welches eine Vielzahl von Sortieröffnungen (2) enthält, deren engster Querschnitt der Sortierquerschnitt (7) ist, wobei an der Zulaufseite (4) des Siebelementes (1) mindestens ein relativ zu diesem bewegbares Räumelement (3) vorhanden und das Siebelement (1) auf der Zulaufseite (4) mit leistenförmigen Erhebungen (5) versehen ist,
dadurch gekennzeichnet,
daß die Sortieröffnungen (2) auf der Zulaufseite (4) einen erweiterten Zulaufquerschnitt (6) haben, dessen Größe mindestens das 1,4-Fache des Sortierquerschnitts (7) der Sortieröffnung (2) ist.Device for sorting aqueous fibrous suspension (S) with the aid of a sieve element (1) which contains a plurality of sorting openings (2), the narrowest cross-section of which is the sorting cross-section (7), on the inlet side (4) of the sieve element (1) at least one clearing element (3) movable relative to this and the sieve element (1) on the inlet side (4) is provided with strip-shaped elevations (5),
characterized,
that the sorting openings (2) on the inlet side (4) have an enlarged inlet cross section (6), the size of which is at least 1.4 times the sorting cross section (7) of the sorting opening (2). Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der erweiterte Zulaufquerschnitt (6) allmählich in den stromab folgenden engeren Querschnitt übergeht, der wiederum stromabwärts konstant ist oder sich wieder erweitert.Device according to claim 1,
characterized,
that the enlarged inlet cross-section (6) gradually merges into the downstream narrower cross-section, which in turn is constant downstream or widens again. Vorrichtung nach Anspruch 2,
dadurch gekennzeichnet,
daß der Übergang vom erweiterten Zulaufquerschnitt (6) auf den stromab folgenden engeren Querschnitt auf einer Tiefe (t) von mindestens 1 mm erfolgt.Device according to claim 2,
characterized,
that the transition from the enlarged inlet cross section (6) to the downstream narrower cross section takes place at a depth (t) of at least 1 mm. Vorrichtung nach Anspruch 2 oder 3,
dadurch gekennzeichnet,
daß der Übergang vom erweiterten Zulaufquerschnitt (6) auf den stromab folgenden engeren Querschnitt in einer Schräge von 45o erfolgt.Device according to claim 2 or 3,
characterized,
that the transition from the widened inflow cross section (6) to the following downstream narrower cross-section in an incline of 45 ° takes place. Vorrichtung nach Anspruch 2, 3 oder 4,
dadurch gekennzeichnet,
daß der stromab folgende engere Querschnitt der Sortierquerschnitt (7) ist.Device according to claim 2, 3 or 4,
characterized,
that the downstream narrower cross section is the sorting cross section (7). Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die Sortieröffnungen (2) runde Querschnitte haben und die erweiterten Zulaufquerschnitte (6) angefast sind.Device according to one of the preceding claims,
characterized,
that the sorting openings (2) have round cross sections and the expanded inlet cross sections (6) are chamfered. Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die leistenförmigen Erhebungen (5) eine Höhe (h) von mindestens 2 mm über der Sieboberfläche aufweisen.Device according to one of the preceding claims,
characterized,
that the strip-shaped elevations (5) have a height (h) of at least 2 mm above the screen surface. Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die der Zulaufseite (4) zugewandte Unterseite (8) des Räumelementes (3) eine Kontur aufweist, bei der der primäre Abstand (a) zwischen Unterseite (8) und Zulaufseite (4) vorne, in Bewegungsrichtung gesehen, geringer ist als der sekundäre Abstand (b) dahinter.Device according to one of the preceding claims,
characterized,
that the inlet side (4) facing underside (8) of the broaching element (3) has a contour in which the primary distance (a) between the underside (8) and inlet side (4) at the front, viewed in the direction of movement, is less than the secondary Distance (b) behind. Vorrichtung nach Anspruch 8,
dadurch gekennzeichnet,
daß die Erstreckung (c) des Räumelementes (3) in Bewegungsrichtung mindestens das 8-Fache des sekundären Abstandes (b) beträgt.Device according to claim 8,
characterized,
that the extension (c) of the broaching element (3) in the direction of movement is at least 8 times the secondary distance (b). Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß das Siebelement (1) im wesentlichen scheibenförmig ist und daß das Räumelement (3) oder die Räumelemente (3) zu einem mit dem Siebelement (1) koaxial angeordneten Rotor gehören.Device according to one of the preceding claims,
characterized,
that the sieve element (1) is essentially disk-shaped and that the broaching element (3) or the broaching elements (3) belong to a rotor arranged coaxially with the sieve element (1). Vorrichtung nach Anspruch 10,
dadurch gekennzeichnet,
daß das Räumelement (3) Flügel aufweist, deren Vorderkante bei Blickrichtung auf das Siebelement (1) derart geschwungen sind, daß radial weiter außen liegende Bereiche der Vorderkante zum Radius einen stumpferen Winkel haben als weiter innen liegende Bereiche.Apparatus according to claim 10,
characterized,
that the clearing element (3) has wings, the front edge of which, when looking at the sieve element (1), is curved in such a way that regions of the front edge lying radially further out have an obtuse angle to the radius than regions lying further inside. Vorrichtung nach Anspruch 10,
dadurch gekennzeichnet,
daß die leistenförmigen Erhebungen (5) in einem Winkel von - 15o bis + 15o zum Radius des Siebelementes (1) ausgerichtet sind.Apparatus according to claim 10,
characterized,
that the strip-shaped elevations (5) are aligned at an angle of - 15 o to + 15 o to the radius of the sieve element (1). Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die leistenförmigen Erhebungen (5) Schweißraupen sind.Device according to one of the preceding claims,
characterized,
that the strip-shaped elevations (5) are weld beads.
EP97104828A 1996-05-18 1997-03-21 Apparatus for screening a fibrous suspension Expired - Lifetime EP0807709B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19620051A DE19620051A1 (en) 1996-05-18 1996-05-18 Device for sorting fibrous suspension
DE19620051 1996-05-18

Publications (2)

Publication Number Publication Date
EP0807709A1 true EP0807709A1 (en) 1997-11-19
EP0807709B1 EP0807709B1 (en) 2001-11-21

Family

ID=7794658

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
EP (1) EP0807709B1 (en)
DE (2) DE19620051A1 (en)

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EP1217122A1 (en) * 2000-12-22 2002-06-26 Voith Paper Patent GmbH Process for making screens for cleaning of paper pulp

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Publication number Priority date Publication date Assignee Title
DE19747653C2 (en) * 1997-10-29 2002-04-25 Voith Paper Patent Gmbh Sieve for fiber suspensions
DE102009015405A1 (en) * 2009-03-27 2010-09-30 Voith Patent Gmbh scree
DE202012012678U1 (en) * 2012-08-02 2013-08-22 Voith Patent Gmbh screening device

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US4276159A (en) * 1980-06-19 1981-06-30 The Black Clawson Company Apparatus for screening paper fiber stock
EP0119345A1 (en) * 1983-01-21 1984-09-26 The Black Clawson Company Screening apparatus for paper making stock
EP0182688A1 (en) * 1984-11-12 1986-05-28 E. + M. Lamort Société Anonyme dite: Purification strainers and method for their production
FR2586720A1 (en) * 1985-09-05 1987-03-06 Black Clawson Co Screening apparatus for paper pulp
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EP0287267A2 (en) * 1987-04-16 1988-10-19 The Black Clawson Company Cylindrical Screen Plates
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US4276159A (en) * 1980-06-19 1981-06-30 The Black Clawson Company Apparatus for screening paper fiber stock
EP0119345A1 (en) * 1983-01-21 1984-09-26 The Black Clawson Company Screening apparatus for paper making stock
EP0182688A1 (en) * 1984-11-12 1986-05-28 E. + M. Lamort Société Anonyme dite: Purification strainers and method for their production
US4657636A (en) * 1985-01-28 1987-04-14 Hitoshi Satomi High density pulp screening apparatus
FR2586720A1 (en) * 1985-09-05 1987-03-06 Black Clawson Co Screening apparatus for paper pulp
EP0287267A2 (en) * 1987-04-16 1988-10-19 The Black Clawson Company Cylindrical Screen Plates
DE4324662A1 (en) * 1993-07-22 1995-01-26 Voith Gmbh J M Sieve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1217122A1 (en) * 2000-12-22 2002-06-26 Voith Paper Patent GmbH Process for making screens for cleaning of paper pulp
US6905032B2 (en) 2000-12-22 2005-06-14 Voith Paper Patent Gmbh Screens for fibrous paper suspensions and process for making same

Also Published As

Publication number Publication date
DE59705439D1 (en) 2002-01-03
DE19620051A1 (en) 1997-11-20
EP0807709B1 (en) 2001-11-21

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