EP1992736A1 - Press assembly - Google Patents

Press assembly Download PDF

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Publication number
EP1992736A1
EP1992736A1 EP08150993A EP08150993A EP1992736A1 EP 1992736 A1 EP1992736 A1 EP 1992736A1 EP 08150993 A EP08150993 A EP 08150993A EP 08150993 A EP08150993 A EP 08150993A EP 1992736 A1 EP1992736 A1 EP 1992736A1
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EP
European Patent Office
Prior art keywords
roll
press
fibrous web
spreader
press nip
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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
EP08150993A
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German (de)
French (fr)
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EP1992736B1 (en
Inventor
Thomas Gnann
Wolfgang Mayer
Franz Schuster
Roland Kurz
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1992736A1 publication Critical patent/EP1992736A1/en
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/04Arrangements thereof
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/36Guiding mechanisms
    • D21F1/40Rolls

Definitions

  • the invention relates to a press arrangement for dewatering a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same, with at least one press nip through which the fibrous web is guided together with at least one water-absorbing dewatering belt.
  • the dewatering belts in the form of press felts are currently fed over guide rolls and a spreader roll.
  • Spreader rollers can compensate for the belt advance of the respective lateral edges and prevent the formation of wrinkles after a band change.
  • the object of the invention is therefore to improve the management of the dewatering belt with the least possible effort.
  • this object is achieved in that the dewatering belt before or after the press nip wraps around a spreader roll with a plastic roll jacket whose diameter is between 130 and 800 cm, with no further roll between the press nip and the spreader roll.
  • Spreader rolls with a roll shell made of plastic are made of DE 197 29 907 as well as the EP 1 239 169 known. It is essential that the roll shell is supported only in an axially central region on a continuous roll carrier at least in the radial direction. Outside this central region, the roll shell has a, a bending of the roll shell relative to the roll carrier permitting distance to the roll carrier.
  • Such spreader rolls can also be designed, in particular, in conjunction with a roll shell made of fiber-reinforced plastic with substantially small roll diameters. This in turn allows the arrangement of spreader rollers relatively close to the respective press nip, so that compared to conventional spreader rollers reduced spreading effect of these spreader rolls is compensated with plastic jacket. In addition, as often a guide roller can be omitted, since the spreader roller takes its place.
  • the dewatering belt should wrap around the spreader roll in a circumferential range between 90 and 180 °. This large wrap additionally improves the spreading effect of this spreader roll.
  • press arrangements in which the press nip is formed between a press roll wrapped by the dewatering belt and a central roll, the central roll being involved in a plurality of press nips.
  • the spreader roll should be arranged in front of the corresponding press nip and the dewatering belt only come into contact with the fibrous web after the spreader roll.
  • the spreader roller is arranged in front of the press nip and the dewatering belt comes into contact with the fibrous web only after the spreader roll.
  • the spreader roller is arranged after the press nip.
  • the dewatering belts should lead the fibrous web after the press nip to the spreader roll together and run the fibrous web after the spreader roll only with the arranged on the, the spreader roll side of the fibrous web dewatering belt.
  • the pulp web after the spreader roll alone leading dewatering belt should wrap around a suctioned guide roller during the routing of the other dewatering belt.
  • the dewatering belt leading the fibrous web after the spreader roll alone can transfer the fibrous web to an endlessly circulating belt of a following unit, for example a further press nip or a dryer group.
  • a spreader roll 3 looped around by a water-absorbing, endlessly circulating dewatering belt 2 is used directly before or after a press nip, with no further roll between the press nip and the spreader roll.
  • the spreader roll 3 has a roll shell made of a fiber-reinforced plastic, which is mounted exclusively in the axially central region on a continuous roll carrier. Outside this central region, the roll shell can bend relative to the roll carrier.
  • the degree of jacket bending as well as the direction thereof depends on the belt tension and the direction of action and the weight of the roll shell.
  • the type of effect depends on the type of deflection (convex or concave) of the looped area of this roller. In all examples, however, a spreading effect is desired.
  • the ends of the roll shell as in the EP 1 239 169 described, be designed with a higher weight.
  • the weight can but according to the DE 197 29 907 also be reduced continuously to the roll ends.
  • an axial displacement of the roll shell on the roll carrier according to the WO 2005/115894 can be an advantage.
  • the spreader roll 3 Due to the low weight, the spreader roll 3, however, remain limited in any case, even with large machine widths to diameter between 130 and 800 cm. This makes it possible to arrange the spreader roll 3 relatively close to the press nip of the dewatering belt 2, thereby replacing a guide roll.
  • the effect of the spreader roller 3 is substantially increased, which their use in many cases because of compared to conventional spreader rolls with metal sheath low spreading effect only makes sense.
  • the spreading effect is further increased by a relatively large wrap of the spreader roll 3 by the dewatering belt 2 in a circumferential range between 90 and 180 °.
  • the fibrous web 1 runs together with both sides of a dewatering belt 2,4 by a, formed by an upper press roller 5 and a lower counter roller 6 press nip.
  • the upper dewatering belt 2 of the press roll 5 wraps around the press nip a spreader roll 3 with a roll shell made of plastic. Between the press nip and the spreader roll 3, the fibrous web 1 is guided by two dewatering belts 2,4.
  • the fibrous web 1 only runs with the lower dewatering belt 4.
  • the lower dewatering belt 4 wraps around an evacuated guide roll arranged opposite the spreader roll 3 7th
  • the lower dewatering belt 4 transfers the fibrous web 1 to an air-permeable belt 8 of a following machine unit, which wraps around an evacuated guide roller 10 during the transfer.
  • Aspirated guide rollers 7,10 usually have a perforated roll shell whose interior is connected to a vacuum source.
  • the spreader roll is in such pressing arrangements in front of the press nip, and then between this spreader roll and the press nip nor an evacuated guide roller to support the acquisition of the fibrous web 1 is arranged.
  • the small dimensions and the improved stretching effect allow the use of the plastic roller spreader roll after the press nip instead of a normal guide roll.
  • pulp web 1 passes through only one of two press rolls 16,18 formed first press nip together with both sides each a water-absorbing drainage tape 15,17. After this first press nip, the fibrous web 1 runs together with the upper dewatering belt 15 through a second press nip formed by the upper press roll 16 and a central roll 11.
  • the fibrous web 1 on the roll shell of the central roll 11 adheres alone up to a third press nip, which is formed by the central roll 11 and a press roll 5 arranged above.
  • a third press nip which is formed by the central roll 11 and a press roll 5 arranged above.
  • the fibrous web 1 runs together with a dewatering belt 2 of the press roll. 5
  • the fibrous web 1 again adheres alone to the roll shell of the central roll 11 until it is taken over by a roll 12 which subsequently guides the fibrous web 1 through a press nip formed by this roll 12 and a further press roll 13 with lower dewatering belt 14.
  • press assembly passes through the fibrous web 1 together with a respective dewatering belt 2,4 a first, formed by a lower press roll 5 and an upper counter roll 6 press nip.
  • the upper dewatering belt 4 guides the fibrous web 1 through a second press nip which is formed between the counter-roller 16 and a press roller 19.
  • the roll shell of this press roll 19 then guides the fibrous web 1 through a third press nip, which is formed by the press roll 19 and an upper press roll 20 looped around by a dewatering belt 21.
  • the fibrous web 1 is transferred from the press roller 19 to an air-permeable belt 23 of a following in the web running direction 9 machine unit, the acquisition of one, the belt 23 looped and evacuated guide roller 22 supports.
  • All dewatering belts 2,4,14,15,17,21 are here designed as air-permeable and water-absorbing press felts.

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Press Drives And Press Lines (AREA)
  • Glass Compositions (AREA)

Abstract

The pressing arrangement has a press gap, through which a fibrous material web (1) is guided together with a water-absorbent dewatering strip (2). The dewatering strip clasps a spreader roller (3) with a roll shell made of plastic before and after the press gap. The diameter of the roll shell lies between 130 and 800 centimeters and no further roll is provided between the press gap and the spreader roll.

Description

Die Erfindung betrifft eine Pressanordnung zur Entwässerung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn in einer Maschine zur Herstellung und/oder Veredlung derselben, mit zumindest einem Pressspalt, durch den die Faserstoffbahn gemeinsam mit wenigstens einem wasseraufnehmenden Entwässerungsband geführt ist.The invention relates to a press arrangement for dewatering a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same, with at least one press nip through which the fibrous web is guided together with at least one water-absorbing dewatering belt.

In Pressenpartien von Papiermaschinen werden die Entwässerungsbänder in Form von Pressfilzen gegenwärtig über Leitwalzen und eine Breitstreckwalze geführt.In press sections of paper machines, the dewatering belts in the form of press felts are currently fed over guide rolls and a spreader roll.

Breitstreckwalzen können dabei den Bandvorlauf der jeweiligen seitlichen Ränder kompensieren und die Faltenbildung nach einem Bandwechsel verhindern.Spreader rollers can compensate for the belt advance of the respective lateral edges and prevent the formation of wrinkles after a band change.

Der mit größeren Maschinenbreiten zunehmende Durchmesser der Leit- und Breitstreckwalzen verhindert oft eine optimale Anordnung derselben auf Grund des meist sehr begrenzten Raumes.The increasing diameter of the guide and spreader rollers with larger machine widths often prevents an optimal arrangement of the same due to the usually very limited space.

Die Aufgabe der Erfindung ist es daher, die Führung des Entwässerungsbandes mit möglichst geringem Aufwand zu verbessern.The object of the invention is therefore to improve the management of the dewatering belt with the least possible effort.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass das Entwässerungsband vor oder nach dem Pressspalt eine Breitstreckwalze mit einem Walzenmantel aus Kunststoff umschlingt, dessen Durchmesser zwischen 130 und 800 cm liegt, wobei sich zwischen dem Pressspalt und der Breitstreckwalze keine weitere Walze befindet.According to the invention this object is achieved in that the dewatering belt before or after the press nip wraps around a spreader roll with a plastic roll jacket whose diameter is between 130 and 800 cm, with no further roll between the press nip and the spreader roll.

Breitstreckwalzen mit einem Walzenmantel aus Kunststoff sind aus der DE 197 29 907 sowie der EP 1 239 169 bekannt. Wesentlich ist dabei, dass der Walzenmantel ausschließlich in einem axial mittleren Bereich auf einem durchgehenden Walzenträger zumindest in radialer Richtung abgestützt wird. Außerhalb dieses mittleren Bereiches weist der Walzenmantel einen, eine Biegung des Walzenmantels relativ zum Walzenträger erlaubenden Abstand zum Walzenträger auf.Spreader rolls with a roll shell made of plastic are made of DE 197 29 907 as well as the EP 1 239 169 known. It is essential that the roll shell is supported only in an axially central region on a continuous roll carrier at least in the radial direction. Outside this central region, the roll shell has a, a bending of the roll shell relative to the roll carrier permitting distance to the roll carrier.

Derartige Breitstreckwalzen können insbesondere auch in Verbindung mit einem Walzenmantel aus faserverstärktem Kunststoff mit wesentlich geringen Walzendurchmessern ausgeführt werden. Dies wiederum erlaubt die Anordnung von Breitstreckwalzen relativ nah am jeweiligen Pressspalt, so dass eine gegenüber herkömmlichen Breitstreckwalzen verminderte Breitstreckwirkung dieser Breitstreckwalzen mit Kunststoffmantel kompensiert wird. Außerdem kann so oft eine Leitwalze entfallen, da die Breitstreckwalze ihren Platz einnimmt.Such spreader rolls can also be designed, in particular, in conjunction with a roll shell made of fiber-reinforced plastic with substantially small roll diameters. This in turn allows the arrangement of spreader rollers relatively close to the respective press nip, so that compared to conventional spreader rollers reduced spreading effect of these spreader rolls is compensated with plastic jacket. In addition, as often a guide roller can be omitted, since the spreader roller takes its place.

Dabei sollte das Entwässerungsband die Breitstreckwalze in einem Umfangsbereich zwischen 90 und 180° umschlingen. Diese große Umschlingung verbessert die Breitstreckwirkung dieser Breitstreckwalze zusätzlich.In this case, the dewatering belt should wrap around the spreader roll in a circumferential range between 90 and 180 °. This large wrap additionally improves the spreading effect of this spreader roll.

Je nach Anforderung, wie zum Beispiel den Wasseranfall im Pressspalt kann es genügen, wenn nur ein Entwässerungsband durch den Pressspalt läuft.Depending on the requirements, such as the amount of water in the press nip, it may be sufficient if only one dewatering belt runs through the press nip.

Wegen der Vielzahl an Pressspalten und der damit verbundenen Raumprobleme ergeben sich besondere Vorteile bei Pressanordnungen, bei denen der Pressspalt zwischen einer vom Entwässerungsband umschlungenen Presswalze und einer Zentralwalze gebildet wird, wobei die Zentralwalze an mehreren Pressspalten beteiligt ist. Dabei sollte die Breitstreckwalze vor dem entsprechenden Pressspalt angeordnet sein und das Entwässerungsband erst nach der Breitstreckwalze mit der Faserstoffbahn in Kontakt kommen.Because of the large number of press nips and the associated space problems, special advantages result in press arrangements in which the press nip is formed between a press roll wrapped by the dewatering belt and a central roll, the central roll being involved in a plurality of press nips. In this case, the spreader roll should be arranged in front of the corresponding press nip and the dewatering belt only come into contact with the fibrous web after the spreader roll.

Oft ist es jedoch erforderlich, dass die Faserstoffbahn mit beidseitig je einem wasseraufnehmenden Entwässerungsband durch den Pressspalt läuft.However, it is often necessary for the fibrous web to run through the press nip with water-absorbing drainage tape on both sides.

Eine besonders vorteilhafte Anordnung ergibt sich in diesem Fall, wenn der Pressspalt von einer vom Entwässerungsband mit der Breitstreckwalze umschlungenen Presswalze und einer Gegenwalze gebildet wird, wobei die Gegenwalze nach dem Pressspalt noch mit einer weiteren Presswalze einen Pressspalt bildet. Auch hier beeinträchtigen die Pressspalte der Gegenwalze den verfügbaren Raum erheblich.A particularly advantageous arrangement is obtained in this case, when the press nip is formed by a pressing roller wrapped by the dewatering belt with the spreader roller and a counter roller, wherein the counter roller after the press nip with a further press roll Pressing gap forms. Again, the press nip of the counter roll affect the available space considerably.

Dabei kann es von Vorteil sein, wenn die Breitstreckwalze vor dem Pressspalt angeordnet ist und das Entwässerungsband erst nach der Breitstreckwalze mit der Faserstoffbahn in Kontakt kommt.It may be advantageous if the spreader roller is arranged in front of the press nip and the dewatering belt comes into contact with the fibrous web only after the spreader roll.

Allerdings kann es im Gegensatz hierzu auch Vorteile haben, wenn die Breitstreckwalze nach dem Pressspalt angeordnet ist. Dabei sollten die Entwässerungsbänder die Faserstoffbahn nach dem Pressspalt bis zur Breitstreckwalze gemeinsam führen und die Faserstoffbahn nach der Breitstreckwalze nur mit dem, auf der, der Breitstreckwalze gegenüberliegenden Seite der Faserstoffbahn angeordneten Entwässerungsband laufen.However, in contrast, it can also have advantages if the spreader roller is arranged after the press nip. The dewatering belts should lead the fibrous web after the press nip to the spreader roll together and run the fibrous web after the spreader roll only with the arranged on the, the spreader roll side of the fibrous web dewatering belt.

Um dabei eine ausreichende Haftung der Faserstoffbahn am allein führenden Entwässerungsband zu gewährleisten, sollte das die Faserstoffbahn nach der Breitstreckwalze allein führende Entwässerungsband während der Wegführung des anderen Entwässerungsbandes eine besaugte Leitwalze umschlingen.In order to ensure sufficient adhesion of the fibrous web on the only leading dewatering belt, the pulp web after the spreader roll alone leading dewatering belt should wrap around a suctioned guide roller during the routing of the other dewatering belt.

Anschließend kann das die Faserstoffbahn nach der Breitstreckwalze allein führende Entwässerungsband die Faserstoffbahn an ein endlos umlaufendes Band einer folgenden Einheit, beispielsweise einen weiteren Pressspalt oder eine Trockengruppe übergeben.Subsequently, the dewatering belt leading the fibrous web after the spreader roll alone can transfer the fibrous web to an endlessly circulating belt of a following unit, for example a further press nip or a dryer group.

Nachfolgend soll die Erfindung an mehreren Ausführungsbeispielen näher erläutert werden. In der beigefügten Zeichnung zeigt:

Figur 1:
einen schematischen Querschnitt durch eine Pressanordnung;
Figur 2:
eine andere Pressanordnung und
Figur 3:
eine weitere Pressanordnung.
The invention will be explained in more detail below with reference to several exemplary embodiments. In the attached drawing shows:
FIG. 1:
a schematic cross section through a press arrangement;
FIG. 2:
another press arrangement and
FIG. 3:
another pressing arrangement.

Bei allen Ausführungen kommt eine, von einem wasseraufnehmenden, endlos umlaufenden Entwässerungsband 2 umschlungene Breitstreckwalze 3 direkt vor oder nach einem Pressspalt zum Einsatz, wobei sich zwischen dem Pressspalt und der Breitstreckwalze keine weitere Walze befindet.In all embodiments, a spreader roll 3 looped around by a water-absorbing, endlessly circulating dewatering belt 2 is used directly before or after a press nip, with no further roll between the press nip and the spreader roll.

Dabei besitzt die Breitstreckwalze 3 einen Walzenmantel aus einem faserverstärkten Kunststoff, der ausschließlich im axial mittleren Bereich auf einem durchgehenden Walzenträger gelagert ist. Außerhalb dieses mittleren Bereiches kann sich der Walzenmantel relativ zum Walzenträger verbiegen. Der Grad der Mantelbiegung sowie deren Richtung stellt sich in Abhängigkeit von der Bandspannung sowie der Wirkrichtung und dem Eigengewicht des Walzenmantels ein.In this case, the spreader roll 3 has a roll shell made of a fiber-reinforced plastic, which is mounted exclusively in the axially central region on a continuous roll carrier. Outside this central region, the roll shell can bend relative to the roll carrier. The degree of jacket bending as well as the direction thereof depends on the belt tension and the direction of action and the weight of the roll shell.

Die Art der Wirkung (Streckung oder Stauchung) hängt dabei von der Art der Durchbiegung (konvex oder konkav) des umschlungenen Bereichs dieser Walze ab. In allen Beispielen wird jedoch eine Breitstreckwirkung angestrebt.The type of effect (stretching or compression) depends on the type of deflection (convex or concave) of the looped area of this roller. In all examples, however, a spreading effect is desired.

Um die Durchbiegung infolge Eigengewicht zu vergrößern, können die Enden des Walzenmantels, wie in der EP 1 239 169 beschrieben, mit einem höheren Gewicht ausgestaltet sein. Das Gewicht kann aber gemäß der DE 197 29 907 zu den Walzenenden auch kontinuierlich vermindert werden.To increase the deflection due to its own weight, the ends of the roll shell, as in the EP 1 239 169 described, be designed with a higher weight. The weight can but according to the DE 197 29 907 also be reduced continuously to the roll ends.

Auch eine axiale Verschiebung des Walzenmantels auf dem Walzenträger entsprechend der WO 2005/115894 kann von Vorteil sein.Also, an axial displacement of the roll shell on the roll carrier according to the WO 2005/115894 can be an advantage.

Durch das geringe Gewicht kann die Breitstreckwalze 3 jedoch in jedem Fall auch bei großen Maschinenbreiten auf Durchmesser zwischen 130 und 800 cm begrenzt bleiben. Dies ermöglicht es die Breitstreckwalze 3 relativ nah am Pressspalt des Entwässerungsbandes 2 anzuordnen und dabei eine Leitwalze zu ersetzen.Due to the low weight, the spreader roll 3, however, remain limited in any case, even with large machine widths to diameter between 130 and 800 cm. This makes it possible to arrange the spreader roll 3 relatively close to the press nip of the dewatering belt 2, thereby replacing a guide roll.

Durch die Nähe zum Pressspalt wird die Wirkung der Breitstreckwalze 3 wesentlich gesteigert, was deren Einsatz in vielen Fällen wegen der im Vergleich zu herkömmlichen Breitstreckwalzen mit Metallmantel geringeren Breitstreckwirkung erst sinnvoll macht.Due to the proximity to the press nip, the effect of the spreader roller 3 is substantially increased, which their use in many cases because of compared to conventional spreader rolls with metal sheath low spreading effect only makes sense.

Die Breitstreckwirkung wird noch durch eine relativ große Umschlingung der Breitstreckwalze 3 durch das Entwässerungsband 2 in einem Umfangsbereich zwischen 90 und 180° gesteigert.The spreading effect is further increased by a relatively large wrap of the spreader roll 3 by the dewatering belt 2 in a circumferential range between 90 and 180 °.

Bei der in Figur 1 dargestellten Pressanordnung läuft die Faserstoffbahn 1 gemeinsam mit beidseitig je einem Entwässerungsband 2,4 durch einen, von einer oberen Presswalze 5 und einer unteren Gegenwalze 6 gebildeten Pressspalt.At the in FIG. 1 shown press arrangement, the fibrous web 1 runs together with both sides of a dewatering belt 2,4 by a, formed by an upper press roller 5 and a lower counter roller 6 press nip.

Dabei umschlingt das obere Entwässerungsband 2 der Presswalze 5 nach dem Pressspalt eine Breitstreckwalze 3 mit einem Walzenmantel aus Kunststoff. Zwischen dem Pressspalt und der Breitstreckwalze 3 wird die Faserstoffbahn 1 von beiden Entwässerungsbändern 2,4 geführt.In this case, the upper dewatering belt 2 of the press roll 5 wraps around the press nip a spreader roll 3 with a roll shell made of plastic. Between the press nip and the spreader roll 3, the fibrous web 1 is guided by two dewatering belts 2,4.

Nach der Breitstreckwalze 3 läuft die Faserstoffbahn 1 jedoch nur noch mit dem unteren Entwässerungsband 4. Um die Haftung der Faserstoffbahn 1 am unteren Entwässerungsband 4 während der Wegführung des oberen Entwässerungsbandes 2 zu steigern, umschlingt das unteren Entwässerungsband 4 eine gegenüber der Breitstreckwalze 3 angeordnete besaugte Leitwalze 7.However, after the spreader roll 3, the fibrous web 1 only runs with the lower dewatering belt 4. In order to increase the adhesion of the fibrous web 1 to the lower dewatering belt 4 during the removal of the upper dewatering belt 2, the lower dewatering belt 4 wraps around an evacuated guide roll arranged opposite the spreader roll 3 7th

Anschließend übergibt das untere Entwässerungsband 4 die Faserstoffbahn 1 an ein luftdurchlässiges Band 8 einer folgenden Maschineneinheit, welches während der Übernahme eine besaugte Leitwalze 10 umschlingt.Subsequently, the lower dewatering belt 4 transfers the fibrous web 1 to an air-permeable belt 8 of a following machine unit, which wraps around an evacuated guide roller 10 during the transfer.

Besaugte Leitwalzen 7,10 besitzen meist einen perforierten Walzenmantel, dessen Innenraum mit einer Unterdruckquelle verbunden ist.Aspirated guide rollers 7,10 usually have a perforated roll shell whose interior is connected to a vacuum source.

Gewöhnlich befindet sich die Breitstreckwalze bei derartigen Pressanordnungen vor dem Pressspalt, wobei zwischen dieser Breitstreckwalze und dem Pressspalt dann noch eine besaugte Leitwalze zur Unterstützung der Übernahme der Faserstoffbahn 1 angeordnet ist.Usually, the spreader roll is in such pressing arrangements in front of the press nip, and then between this spreader roll and the press nip nor an evacuated guide roller to support the acquisition of the fibrous web 1 is arranged.

Die geringen Abmessungen und die verbesserte Streckwirkung ermöglichen jedoch den Einsatz der Breitstreckwalze mit Kunststoff-Walzenmantel nach dem Pressspalt anstelle einer normalen Leitwalze.However, the small dimensions and the improved stretching effect allow the use of the plastic roller spreader roll after the press nip instead of a normal guide roll.

Bei der in Figur 2 gezeigten Pressanordnung durchläuft die Faserstoffbahn 1 erst einen von zwei Presswalzen 16,18 gebildeten ersten Pressspalt gemeinsam mit beidseitig je einem wasseraufnehmenden Entwässerungsband 15,17. Nach diesem ersten Pressspalt läuft die Faserstoffbahn 1 gemeinsam mit dem oberen Entwässerungsband 15 durch einen zweiten, von der oberen Presswalze 16 und einer Zentralwalze 11 gebildeten Pressspalt.At the in FIG. 2 shown pulp web 1 passes through only one of two press rolls 16,18 formed first press nip together with both sides each a water-absorbing drainage tape 15,17. After this first press nip, the fibrous web 1 runs together with the upper dewatering belt 15 through a second press nip formed by the upper press roll 16 and a central roll 11.

Danach läuft die Faserstoffbahn 1 am Walzenmantel der Zentralwalze 11 haftend allein bis zu einem dritten Pressspalt, der von der Zentralwalze 11 und einer darüber angeordneten Presswalze 5 gebildet wird. Durch diesen dritten Pressspalt läuft die Faserstoffbahn 1 gemeinsam mit einem Entwässerungsband 2 der Presswalze 5.Thereafter, the fibrous web 1 on the roll shell of the central roll 11 adheres alone up to a third press nip, which is formed by the central roll 11 and a press roll 5 arranged above. Through this third press nip, the fibrous web 1 runs together with a dewatering belt 2 of the press roll. 5

Nach diesem dritten Pressspalt läuft die Faserstoffbahn 1 wieder allein am Walzenmantel der Zentralwalze 11 haftend bis zur Übernahme durch eine Walze 12, welche die Faserstoffbahn 1 anschließend durch einen, von dieser Walze 12 und einer weiteren Presswalze 13 mit unterem Entwässerungsband 14 gebildeten Pressspalt führt.After this third press nip, the fibrous web 1 again adheres alone to the roll shell of the central roll 11 until it is taken over by a roll 12 which subsequently guides the fibrous web 1 through a press nip formed by this roll 12 and a further press roll 13 with lower dewatering belt 14.

Durch die kompakte Anordnung wird der Einsatz von Breitstreckwalzen erschwert. Dennoch kann insbesondere das obere Entwässerungsband 2 des dritten Pressspaltes vor diesem eine Breitstreckwalze 3 mit Kunststoff-Walzenmantel umschlingen.Due to the compact arrangement, the use of spreader rollers is made more difficult. Nevertheless, in particular, the upper dewatering belt 2 of the third press nip in front of this wrap around a spreader roll 3 with a plastic roll shell.

Bei der in Figur 3 dargestellten Pressanordnung durchläuft die Faserstoffbahn 1 gemeinsam mit je einem Entwässerungsband 2,4 einen ersten, von einer unteren Presswalze 5 und einer oberen Gegenwalze 6 gebildeten Pressspalt.At the in FIG. 3 shown press assembly passes through the fibrous web 1 together with a respective dewatering belt 2,4 a first, formed by a lower press roll 5 and an upper counter roll 6 press nip.

Anschließend führt das obere Entwässerungsband 4 die Faserstoffbahn 1 durch einen zweiten Pressspalt, der zwischen der Gegenwalze 16 und einer Presswalze 19 gebildet wird.Subsequently, the upper dewatering belt 4 guides the fibrous web 1 through a second press nip which is formed between the counter-roller 16 and a press roller 19.

Der Walzenmantel dieser Presswalze 19 führt die Faserstoffbahn 1 dann durch einen dritten Pressspalt, der von der Presswalze 19 und einer oberen, von einem Entwässerungsband 21 umschlungenen Presswalze 20 gebildet wird.The roll shell of this press roll 19 then guides the fibrous web 1 through a third press nip, which is formed by the press roll 19 and an upper press roll 20 looped around by a dewatering belt 21.

Danach wird die Faserstoffbahn 1 von der Presswalze 19 an ein luftdurchlässiges Band 23 einer in Bahnlaufrichtung 9 folgenden Maschineneinheit übergeben, wobei die Übernahme von einer, vom Band 23 umschlungenen und besaugten Leitwalze 22 unterstützt.Thereafter, the fibrous web 1 is transferred from the press roller 19 to an air-permeable belt 23 of a following in the web running direction 9 machine unit, the acquisition of one, the belt 23 looped and evacuated guide roller 22 supports.

Auch hier bleibt wenig Raum für Breitstreckwalzen 3.Again, there is little room for spreader rollers. 3

Jedoch ist der Einsatz einer Breitstreckwalze 3 anstelle einer normalen Leitwalze insbesondere beim unteren Entwässerungsband 2 nach dem ersten Pressspalt von Vorteil.However, the use of a spreader roller 3 instead of a normal guide roller, in particular at the lower dewatering belt 2 after the first press nip of advantage.

Alle Entwässerungsbänder 2,4,14,15,17,21 sind hier als luftdurchlässige und wasseraufnehmende Pressfilze ausgebildet.All dewatering belts 2,4,14,15,17,21 are here designed as air-permeable and water-absorbing press felts.

Claims (10)

Pressanordnung zur Entwässerung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn (1) in einer Maschine zur Herstellung und/oder Veredlung derselben, mit zumindest einem Pressspalt, durch den die Faserstoffbahn (1) gemeinsam mit wenigstens einem wasseraufnehmenden Entwässerungsband (2) geführt ist, dadurch gekennzeichnet, dass
das Entwässerungsband (2) vor oder nach dem Pressspalt eine Breitstreckwalze (3) mit einem Walzenmantel aus Kunststoff umschlingt, dessen Durchmesser zwischen 130 und 800 cm liegt, wobei sich zwischen dem Pressspalt und der Breitstreckwalze (3) keine weitere Walze befindet.
Press arrangement for dewatering a paper, board, tissue or other fibrous web (1) in a machine for producing and / or finishing the same, with at least one press nip through which the fibrous web (1) together with at least one water-absorbing dewatering belt (2 ), characterized in that
the dewatering belt (2) before or after the press nip wraps around a spreader roll (3) with a plastic roll jacket whose diameter is between 130 and 800 cm, with no further roll between the press nip and the spreader roll (3).
Pressanordnung nach Anspruch 1, dadurch gekennzeichnet, dass
das Entwässerungsband (2) die Breitstreckwalze (3) in einem Umfangsbereich zwischen 90 und 180° umschlingt.
Press arrangement according to claim 1, characterized in that
the dewatering belt (2) wraps around the spreader roll (3) in a circumferential region between 90 and 180 °.
Pressanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass
nur ein Entwässerungsband (2) durch den Pressspalt läuft.
Press arrangement according to claim 1 or 2, characterized in that
only one dewatering belt (2) passes through the press nip.
Pressanordnung nach Anspruch 3, dadurch gekennzeichnet, dass
der Pressspalt zwischen einer vom Entwässerungsband (2) umschlungenen Presswalze (5) und einer Zentralwalze (11) gebildet wird, wobei die Zentralwalze (11) an mehreren Pressspalten beteiligt ist.
Press arrangement according to claim 3, characterized in that
the press nip is formed between a press roll (5) looped by the dewatering belt (2) and a central roll (11), the central roll (11) being involved in a plurality of press nips.
Pressanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass
die Faserstoffbahn (1) mit beidseitig je einem wasseraufnehmenden Entwässerungsband (2,4) durch den Pressspalt läuft.
Press arrangement according to claim 1 or 2, characterized in that
the fibrous web (1) runs on both sides with a respective water-absorbing dewatering belt (2, 4) through the press nip.
Pressanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
die Breitstreckwalze (3) vor dem Pressspalt angeordnet ist und das Entwässerungsband (2) erst nach der Breitstreckwalze (3) mit der Faserstoffbahn (1) in Kontakt kommt.
Press arrangement according to one of the preceding claims, characterized in that
the spreader roll (3) is arranged in front of the press nip and the dewatering belt (2) only comes into contact with the fibrous web (1) after the spreader roll (3).
Pressanordnung nach Anspruch 5 und 6, dadurch gekennzeichnet, dass
der Pressspalt von einer vom Entwässerungsband (2) mit der Breitstreckwalze (3) umschlungenen Presswalze (5) und einer Gegenwalze (6) gebildet wird, wobei die Gegenwalze (6) nach dem Pressspalt noch mit einer weiteren Presswalze (19) einen Pressspalt bildet.
Press arrangement according to claim 5 and 6, characterized in that
the press nip is formed by a press roll (5) looped around by the dewatering belt (2) with the spreader roll (3) and a counter roll (6), wherein the counter roll (6) forms a press nip after the press nip with a further press roll (19).
Pressanordnung nach Anspruch 5, dadurch gekennzeichnet, dass
die Breitstreckwalze (3) nach dem Pressspalt angeordnet ist, die Entwässerungsbänder (2,4) die Faserstoffbahn (1) nach dem Pressspalt bis zur Breitstreckwalze (3) gemeinsam führen und die Faserstoffbahn (1) nach der Breitstreckwalze (3) mit dem, auf der, der Breitstreckwalze (3) gegenüberliegenden Seite der Faserstoffbahn (1) angeordneten Entwässerungsband (4) läuft.
Press arrangement according to claim 5, characterized in that
the spreader roll (3) is arranged after the press nip, the dewatering belts (2, 4) jointly guide the fibrous web (1) after the press nip to the spreader roll (3) and the fibrous web (1) after the spreader roll (3) with the, on the, the spreader roll (3) opposite side of the fibrous web (1) arranged drainage belt (4) runs.
Pressanordnung nach Anspruch 8, dadurch gekennzeichnet, dass
das die Faserstoffbahn (1) nach der Breitstreckwalze (3) allein führende Entwässerungsband (4) während der Wegführung des anderen Entwässerungsbandes (2) eine besaugte Leitwalze (7) umschlingt.
Press arrangement according to claim 8, characterized in that
that the fibrous web (1) after the spreader roll (3) alone leading dewatering belt (4) during the routing of the other dewatering belt (2) wraps around an evacuated guide roller (7).
Pressanordnung nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass
die Faserstoffbahn (1) nach der Breitstreckwalze (3) allein führende Entwässerungsband (4) die Faserstoffbahn (1) an ein endlos umlaufendes Band (8) einer folgenden Einheit übergibt.
Press arrangement according to claim 8 or 9, characterized in that
the fibrous web (1) after the spreader roll (3) alone leading dewatering belt (4) passes the fibrous web (1) to an endlessly circulating belt (8) of a following unit.
EP08150993A 2007-05-18 2008-02-04 Press assembly Not-in-force EP1992736B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007023393A DE102007023393A1 (en) 2007-05-18 2007-05-18 Press arrangement

Publications (2)

Publication Number Publication Date
EP1992736A1 true EP1992736A1 (en) 2008-11-19
EP1992736B1 EP1992736B1 (en) 2010-04-21

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EP08150993A Not-in-force EP1992736B1 (en) 2007-05-18 2008-02-04 Press assembly

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EP (1) EP1992736B1 (en)
AT (1) ATE465294T1 (en)
DE (2) DE102007023393A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010018272A1 (en) 2010-04-26 2011-10-27 Airbus Operations Gmbh Rail system and method for mounting a component in an aircraft

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3703563A1 (en) * 1986-02-13 1987-08-20 Valmet Oy STRETCH ROLLER OR SIMILAR ROLL FOR PAPER MACHINE TOWELS AND A METHOD FOR PRODUCING THE ROLL
DE3729723A1 (en) * 1986-09-12 1988-03-17 Valmet Oy CLOSED AND COMPACT PRESS RELEASE OF A PAPER MACHINE
EP0515339A1 (en) * 1991-05-21 1992-11-25 Valmet Corporation System in a press section of a paper machine for monitoring and control of the running of the press felts
DE19729907A1 (en) 1997-07-12 1999-01-14 Voith Sulzer Papiermasch Gmbh roller
EP1239169A1 (en) 2001-03-09 2002-09-11 Voith Paper Patent GmbH Roller with a shell having a non-uniform density
WO2005115894A1 (en) 2004-05-29 2005-12-08 Voith Patent Gmbh Rotary part

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3703563A1 (en) * 1986-02-13 1987-08-20 Valmet Oy STRETCH ROLLER OR SIMILAR ROLL FOR PAPER MACHINE TOWELS AND A METHOD FOR PRODUCING THE ROLL
DE3729723A1 (en) * 1986-09-12 1988-03-17 Valmet Oy CLOSED AND COMPACT PRESS RELEASE OF A PAPER MACHINE
EP0515339A1 (en) * 1991-05-21 1992-11-25 Valmet Corporation System in a press section of a paper machine for monitoring and control of the running of the press felts
DE19729907A1 (en) 1997-07-12 1999-01-14 Voith Sulzer Papiermasch Gmbh roller
EP1239169A1 (en) 2001-03-09 2002-09-11 Voith Paper Patent GmbH Roller with a shell having a non-uniform density
WO2005115894A1 (en) 2004-05-29 2005-12-08 Voith Patent Gmbh Rotary part

Also Published As

Publication number Publication date
ATE465294T1 (en) 2010-05-15
DE102007023393A1 (en) 2008-11-20
DE502008000546D1 (en) 2010-06-02
EP1992736B1 (en) 2010-04-21

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