EP1101862B1 - Pressing arrangement - Google Patents

Pressing arrangement Download PDF

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Publication number
EP1101862B1
EP1101862B1 EP20000122518 EP00122518A EP1101862B1 EP 1101862 B1 EP1101862 B1 EP 1101862B1 EP 20000122518 EP20000122518 EP 20000122518 EP 00122518 A EP00122518 A EP 00122518A EP 1101862 B1 EP1101862 B1 EP 1101862B1
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EP
European Patent Office
Prior art keywords
arrangement according
pressing arrangement
suction
dewatering belt
fibrous web
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
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EP20000122518
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German (de)
French (fr)
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EP1101862A2 (en
EP1101862A3 (en
Inventor
Wolfgang Mayer
Hans Prinzing
Dirk Thomas
Ingolf Cedra
Thomas Augscheller
Roland Mayer
Gerhard Kotitschke
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
Priority claimed from DE1999155030 external-priority patent/DE19955030A1/en
Priority claimed from DE2000130048 external-priority patent/DE10030048A1/en
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1101862A2 publication Critical patent/EP1101862A2/en
Publication of EP1101862A3 publication Critical patent/EP1101862A3/en
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Publication of EP1101862B1 publication Critical patent/EP1101862B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0272—Wet presses in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof

Definitions

  • the invention relates to a pressing arrangement for dewatering a paper, cardboard, tissue or another fibrous web in a machine for producing and / or finishing the same, consisting of at least one press nip formed by two press rolls pressed against one another, by at least one side of the fibrous web an above and below the fibrous web extending dewatering belt runs, the fibrous web after the press nip in a subsequent guide path is in contact with the upper and the lower dewatering band.
  • a sandwich guide is necessary in order to be able to guide the still moist fibrous web safely and stably out of the press nip.
  • the lower dewatering belt is guided in the region of the guide path via at least one suction device extending transversely to the fibrous web, which is connected to a vacuum source.
  • a press arrangement is known from US 5 888 354.
  • the object of the invention is therefore, the pressing arrangement with respect to a good To improve guidance and the lowest possible rewetting of the fibrous web.
  • the object has been achieved in that at the beginning and / or at the end of the suction device is arranged a transversely extending to the fibrous web and standing in contact with the lower dewatering strip wiper strip for water discharge.
  • the negative pressure of the suction device increases the contact pressure of the lower dewatering belt to the squeegee, so that they very efficiently strip water from the dewatering belt and can dissipate.
  • the wiper blade can also divide the thrown off from the roll shell of the lower press roll water.
  • the negative pressure is preferably between 0.1 and 0.4 bar.
  • the effort is significantly minimized.
  • the negative pressure thereby increases the contact pressure of the fibrous web at the lower dewatering belt and the detachment from the upper dewatering belt, so that the upper dewatering belt can be led away at the end of the guide track and the fibrous web adheres well to the guide track on the lower dewatering belt.
  • the routing of the upper drainage band minimizes rewetting.
  • the suction device extends only over part of the guide track, viewed in the web running direction, and preferably ends before the end of the guide track. This results from the fact that the effect of the suction device with respect to rewet and leadership of the fibrous web is maintained even after the suction device at least until the end of the guide track to a sufficient extent.
  • suction device preferably designed as a suction box, which begins in a range between 40 and 80 cm after the press nip.
  • the suction box should be pivotally mounted.
  • the suction device has one or more suction slots opposite the dewatering belt.
  • the width of the suction slots is preferably limited to 10 - 30 mm, so that the dewatering belt with the fibrous web is not pulled too far into the suction slots. It may also be advantageous if the suction slots are different in width. For cleaning the interior of the suction box and / or the suction slots, the arrangement of a spray pipe in the suction box may be advantageous.
  • the guide track has i. a. a length between 100 and 180 cm.
  • the lower dewatering belt should be guided at the end of the guide section via a further suction arrangement, preferably in the form of an evacuated roll. This applies in particular when the suction device stops to limit the effort far before the end of the guide track.
  • a further suction arrangement preferably in the form of an evacuated roll. This applies in particular when the suction device stops to limit the effort far before the end of the guide track.
  • water and the air boundary layer should be stripped from the evacuated roll in the non-looped region.
  • the squeegee at the beginning of the suction device can, advantageously together with the suction device, part of a, associated with the lower press roller Water collecting device, which collects and discharges the thrown off and stripped water.
  • the squeegee is preceded by a separate guide plate or guide body for discharging the water thrown off from the lower press roll.
  • a water intake device preferably in the form of a gutter.
  • At least the roll shell of a press roll should be pressed by a support element towards the press nip, and the press nip should preferably be made longer.
  • the press section is part of a machine for producing a fibrous web 1 in the form of a paper web and serves for dewatering the same.
  • the figure shows the one or more of several press nips, which is formed by two pressed against each other and, for example, about one above the other press rolls 2.3.
  • a water-permeable, air-permeable, endless circulating dewatering belt in the form of a press felt for receiving the squeezed out water through the press nip. Because of the high speed of the web and the strong adhesion of the fibrous web 1 to both dewatering belts 4, 5, the fibrous web 1 after the press nip in a subsequent guide path 6 also remains with both Drainage tapes 4.5 in contact.
  • the guide section 6 has a length of about 140 cm.
  • the lower dewatering belt 5 is guided in a part of the guide path 6 via a transverse to the fibrous web 1 suction device 7, which is connected via a terminal 15 with a vacuum source.
  • the suction device 6 begins about 60 cm after the press nip.
  • the negative pressure acts through a plurality of suction slots of the suction device 7 on the lower dewatering belt 5 and thus hinders a rewetting of the fibrous web 1 of this dewatering belt 5 forth, wherein the suction slots have the same width.
  • the adhesion to the lower dewatering belt 5 is hereby increased and a detachment of the fibrous web 1 from the upper dewatering belt 4 is effected.
  • the short in length in the web running direction 8 with respect to the guide path 6 short suction device 7 represents a good compromise between effort and effect.
  • the fibrous web 1 continues to run only with the lower dewatering belt 5.
  • the lower dewatering belt 5 is guided at the end of the guide section 6 via a further suction assembly 10 in the form of a vacuumed roller. It indicates the stripping of water and air via a separately mounted scraper 19 to increase the efficiency of the evacuated roll.
  • the scraper 19 is pressed via a transverse to the machine air hose to the jacket of the evacuated roll.
  • each one transverse to the fibrous web 1 extending and standing with the lower dewatering belt 5 in contact wiper strip 9 is arranged for water discharge.
  • the negative pressure of the suction device 7 increases the contact pressure of the lower dewatering belt 5 to the squeegee 9, so that they can increasingly remove water from the lower dewatering belt 5.
  • the squeegee 9 have a comparative effect on the Water content in the lower dewatering belt 5, which has an advantageous effect on the moisture profile of the fibrous web 1.
  • the first squeegee strip 9 in the direction of web travel 8 is part of a water collecting device 17 which collects the thrown off and stripped water, together with the suction device 7. The latter also absorbs the water scraped off by a scraper 16 from the lower pressing roller 3.
  • a guide plate 18 is shown here, which is arranged in front of the first squeegee 9 and the discharged water of the lower pressure roller 3 derives.
  • a water intake device 11 For receiving the thrown off from the upper pressure roller 2 water is provided in the outlet gusset between the upper pressure roller 2 and the upper dewatering belt 4, a water intake device 11 in the form of a known gutter.
  • the roll coats 12 of both press rolls 2, 3 are pressed against one another via the support elements 13, 14.
  • the roll shell 12 of the upper press roll 2 is designed to be flexible and the support element 13 of the upper press roll 2 has a concave contact surface.
  • the roll shell 12 of the lower press roll 3 is relatively dimensionally stable and the contact surface of this support element 14 convex.
  • this is only an example.

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Description

Die Erfindung betrifft eine Pressanordnung zur Entwässerung einer Papier-, Karton-, Tissue-oder einer anderen Faserstoffbahn in einer Maschine zur Herstellung und/oder Veredelung derselben, bestehend aus zumindest einem, von zwei gegeneinander gepreßten Presswalzen gebildeten Preßspalt, durch den neben der Faserstoffbahn wenigstens ein oberhalb und ein unterhalb der Faserstoffbahn verlaufendes Entwässerungsband läuft, wobei die Faserstoffbahn nach dem Preßspalt in einer sich anschließenden Führungsstrecke mit dem oberen und dem unteren Entwässerungsband in Kontakt steht. Eine solche Sandwichführung ist notwendig um die noch feuchte Faserstoffbahn sicher und stabil aus dem Pressspalt führen zu können. Weiterhin wird das untere Entwässerungsband im Bereich der Führungsstrecke über zumindest eine quer zur Faserstoffbahn verlaufende Saugvorrichtung geführt, welche mit einer Unterdruckquelle verbunden ist. Eine solche Pressanordnung ist aus der US 5 888 354 bekannt.The invention relates to a pressing arrangement for dewatering a paper, cardboard, tissue or another fibrous web in a machine for producing and / or finishing the same, consisting of at least one press nip formed by two press rolls pressed against one another, by at least one side of the fibrous web an above and below the fibrous web extending dewatering belt runs, the fibrous web after the press nip in a subsequent guide path is in contact with the upper and the lower dewatering band. Such a sandwich guide is necessary in order to be able to guide the still moist fibrous web safely and stably out of the press nip. Furthermore, the lower dewatering belt is guided in the region of the guide path via at least one suction device extending transversely to the fibrous web, which is connected to a vacuum source. Such a press arrangement is known from US 5 888 354.

Eine weitere Pressanordnung ist in der DE 19644110 A1 beschrieben. Dabei wird das untere Entwässerungsband über den gesamten Bereich der gemeinsamen Führungsstrecke beider Entwässerungsbänder und darüber hinaus über einen Saugkasten geführt. Die Erzeugung des Unterdrucks erfolgt über das Ausblasen von Druckluft.Another pressing arrangement is described in DE 19644110 A1. The lower dewatering belt is guided over the entire area of the common guide section of both dewatering belts and, moreover, via a suction box. The generation of the negative pressure via the blowing out of compressed air.

Insbesondere bei hohen Bahngeschwindigkeiten und geringen Flächengewichten der Faserstoffbahn können sich lange Führungsstrecken erforderlich machen. Dies ist mit einem erheblichen konstruktiven und energetischen Aufwand für den Saugkasten verbunden. Die dabei realisierbaren Unterdrücke reichen im allgemeinen nicht aus, um auf die Faserstoffbahn einen positiven Effekt ausüben zu können.Especially at high web speeds and low basis weights of the fibrous web, long guide distances may be required. This is associated with a considerable constructive and energetic effort for the suction box. The realizable underpressures are generally not sufficient to be able to exert a positive effect on the fibrous web.

Hinzu kommt, daß der Rückbefeuchtung der Faserstoffbahn, insbesondere vom unteren Entwässerungsband ausgehend, nur unzureichend begegnet wird.In addition, the remoistening of the fibrous web, in particular from the lower dewatering band, is encountered only inadequately.

Die Aufgabe der Erfindung ist es daher, die Pressanordnung hinsichtlich einer guten Führung und einer möglichst geringen Rückbefeuchtung der Faserstoffbahn zu verbessern.The object of the invention is therefore, the pressing arrangement with respect to a good To improve guidance and the lowest possible rewetting of the fibrous web.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, daß am Anfang und/oder am Ende der Saugvorrichtung eine quer zur Faserstoffbahn verlaufende und mit dem unteren Entwässerungsband in Kontakt stehende Abstreifleiste zur Wasserableitung angeordnet ist. Der Unterdruck der Saugvorrichtung erhöht die Anpressung des unteren Entwässerungsbandes an die Abstreifleisten, so daß diese sehr effizient Wasser vom Entwässerungsband abstreifen und abführen können. Andererseits kann die Abstreifleiste auch das vom Walzenmantel der unteren Preßwalze abgeschleuderte Wasser abteilen. Der Unterdruck liegt vorzugsweise zwischen 0,1 und 0,4 bar.According to the invention the object has been achieved in that at the beginning and / or at the end of the suction device is arranged a transversely extending to the fibrous web and standing in contact with the lower dewatering strip wiper strip for water discharge. The negative pressure of the suction device increases the contact pressure of the lower dewatering belt to the squeegee, so that they very efficiently strip water from the dewatering belt and can dissipate. On the other hand, the wiper blade can also divide the thrown off from the roll shell of the lower press roll water. The negative pressure is preferably between 0.1 and 0.4 bar.

Durch die Längenbegrenzung der Saugvorrichtung auf die Führungsstrecke wird der Aufwand erheblich minimiert. Der Unterdruck erhöht dabei die Anpressung der Faserstoffbahn am unteren Entwässerungsband sowie die Ablösung vom oberen Entwässerungsband, so daß das obere Entwässerungsband am Ende der Führungsstrecke weggeführt werden kann und die Faserstoffbahn nach der Führungsstrecke gut am unteren Entwässerungsband haftet. Die Wegführung des oberen Entwässerungsbandes minimiert die Rückbefeuchtung.By limiting the length of the suction device on the guide route, the effort is significantly minimized. The negative pressure thereby increases the contact pressure of the fibrous web at the lower dewatering belt and the detachment from the upper dewatering belt, so that the upper dewatering belt can be led away at the end of the guide track and the fibrous web adheres well to the guide track on the lower dewatering belt. The routing of the upper drainage band minimizes rewetting.

Durch die Verbindung der Saugvorrichtung mit einer Unterdruckquelle wird eine gleichmäßige Besaugung des luftdurchlässigen, unteren Entwässerungsbandes ermöglicht. Dies wirkt der Rückbefeuchtung der Faserstoffbahn in erheblichem Umfang entgegen, wobei zusätzlich noch Wasser aus dem Entwässerungsband gesaugt und abgeführt wird.By connecting the suction device with a vacuum source, a uniform aspiration of the air-permeable, lower dewatering belt is made possible. This counteracts the rewetting of the fibrous web to a considerable extent, in addition still water from the dewatering belt is sucked and removed.

Zur Begrenzung des Aufwandes ist es oft ausreichend, wenn die Saugvorrichtung sich nur über einen Teil der Führungsstrecke, in Bahnlaufrichtung betrachtet, erstreckt und vorzugsweise bereits vor dem Ende der Führungsstrecke endet. Dies resultiert daraus, daß die Wirkung der Saugvorrichtung hinsichtlich Rückbefeuchtung und Führung der Faserstoffbahn auch nach der Saugvorrichtung zumindest bis zum Ende der Führungsstrecke in ausreichendem Maß erhalten bleibt.To limit the effort, it is often sufficient if the suction device extends only over part of the guide track, viewed in the web running direction, and preferably ends before the end of the guide track. This results from the fact that the effect of the suction device with respect to rewet and leadership of the fibrous web is maintained even after the suction device at least until the end of the guide track to a sufficient extent.

Eine konstruktiv einfache Lösung ergibt sich, wenn die Saugvorrichtung vorzugsweise als Saugkasten ausgeführt ist, der in einem Bereich zwischen 40 und 80 cm nach dem Preßspalt beginnt. Der Saugkasten sollte schwenkbar gelagert sein.A structurally simple solution results when the suction device preferably designed as a suction box, which begins in a range between 40 and 80 cm after the press nip. The suction box should be pivotally mounted.

Die Saugvorrichtung besitzt gegenüber dem Entwässerungsband eine oder mehrere Saugschlitze. Die Breite der Saugschlitze ist vorzugsweise auf 10 - 30 mm begrenzt, damit das Entwässerungsband mit der Faserstoffbahn nicht zu weit in die Saugschlitze gezogen wird. Dabei kann es auch von Vorteil sein, wenn die Saugschlitze unterschiedlich breit sind. Zur Reinigung des Inneren des Saugkastens und/oder der Saugschlitze kann die Anordnung eines Sprührohres im Saugkasten vorteilhaft sein.The suction device has one or more suction slots opposite the dewatering belt. The width of the suction slots is preferably limited to 10 - 30 mm, so that the dewatering belt with the fibrous web is not pulled too far into the suction slots. It may also be advantageous if the suction slots are different in width. For cleaning the interior of the suction box and / or the suction slots, the arrangement of a spray pipe in the suction box may be advantageous.

Die Führungsstrecke hat i. a. eine Länge zwischen 100 und 180 cm. Um beim Wegführen des oberen Entwässerungsbandes am Ende der Führungsstrecke die Faserstoffbahn sicher am unteren Entwässerungsband zu halten, sollte das untere Entwässerungsband am Ende der Führungsstrecke über eine weitere Sauganordnung, vorzugsweise in Form einer besaugten Walze geführt werden. Dies gilt insbesondere dann, wenn die Saugvorrichtung zur Begrenzung des Aufwandes weit vor dem Ende der Führungsstrecke aufhört. Um die Wirksamkeit der besaugten Walze zu verbessern, sollten Wasser und die Luftgrenzschicht im nichtumschlungenen Bereich von der besaugten Walze abgestreift werden.The guide track has i. a. a length between 100 and 180 cm. In order to securely hold the fibrous web at the lower dewatering belt when the upper dewatering belt is being removed at the end of the guide section, the lower dewatering belt should be guided at the end of the guide section via a further suction arrangement, preferably in the form of an evacuated roll. This applies in particular when the suction device stops to limit the effort far before the end of the guide track. To improve the effectiveness of the evacuated roll, water and the air boundary layer should be stripped from the evacuated roll in the non-looped region.

Die Abstreifleiste am Anfang der Saugvorrichtung kann dabei, vorteilhafterweise mit der Saugvorrichtung zusammen, Teil einer, der unteren Presswalze zugeordneten Wasserauffangvorrichtung sein, welche das abgeschleuderte und abgestreifte Wasser sammelt und abführt. Es sind jedoch auch Ausführungen möglich, bei denen der Abstreifleiste ein separates Leitblech oder Leitkörper zum Abführen des von der unteren Preßwalze abgeschleuderten Wassers vorgelagert ist.The squeegee at the beginning of the suction device can, advantageously together with the suction device, part of a, associated with the lower press roller Water collecting device, which collects and discharges the thrown off and stripped water. However, embodiments are also possible in which the squeegee is preceded by a separate guide plate or guide body for discharging the water thrown off from the lower press roll.

Um eine Befeuchtung durch das abgeschleuderte Wasser der oberen Presswalze zu verhindern sollte auch dem oberen Entwässerungsband nach dem Preßspalt eine Wasseraufnahmevorrichtung, vorzugsweise in Form einer Wasserrinne zugeordnet sein.In order to prevent moistening by the thrown off water of the upper pressure roller and the upper dewatering belt after the press nip should be assigned a water intake device, preferably in the form of a gutter.

Zur Ausbildung eines möglichst gleichmäßigen und wirksamen Walzenspaltes sollte zumindest der Walzenmantel einer Presswalze von einem Stützelement zum Preßspalt hin gedrückt werden und der Preßspalt vorzugsweise verlängert ausgeführt sein.To form a roll gap that is as uniform and effective as possible, at least the roll shell of a press roll should be pressed by a support element towards the press nip, and the press nip should preferably be made longer.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur einen schematischen Querschnitt durch eine erfindungsgemäße Pressanordnung.The invention will be explained in more detail with reference to an exemplary embodiment. In the accompanying drawing, the figure shows a schematic cross section through a press arrangement according to the invention.

Die Pressenpartie ist Teil einer Maschine zur Herstellung einer Faserstoffbahn 1 in Form einer Papierbahn und dient der Entwässerung derselben. Die Figur zeigt hierzu den oder einen von mehreren Preßspalten, welcher von zwei gegeneinander gepreßten und beispielhaft etwa übereinander angeordneten Presswalzen 2,3 gebildet wird.The press section is part of a machine for producing a fibrous web 1 in the form of a paper web and serves for dewatering the same. The figure shows the one or more of several press nips, which is formed by two pressed against each other and, for example, about one above the other press rolls 2.3.

Neben der Faserstoffbahn 1 wird, oberhalb 4 und unterhalb 5 angeordnet, ein wasser- und luftdurchlässiges, endlos umlaufendes Entwässerungsband in Form eines Preßfilzes zur Aufnahme des ausgepressten Wassers durch den Preßspalt geführt. Wegen der hohen Bahngeschwindigkeit und der starken Haftung der Faserstoffbahn 1 an beiden Entwässerungsbändern 4,5 bleibt die Faserstoffbahn 1 nach dem Preßspalt in einer sich anschließenden Führungsstrecke 6 auch mit beiden Entwässerungsbändern 4,5 in Kontakt. Die Führungsstrecke 6 hat ein Länge von ca. 140 cm.In addition to the fibrous web 1, above 4 and below 5 arranged, a water-permeable, air-permeable, endless circulating dewatering belt in the form of a press felt for receiving the squeezed out water through the press nip. Because of the high speed of the web and the strong adhesion of the fibrous web 1 to both dewatering belts 4, 5, the fibrous web 1 after the press nip in a subsequent guide path 6 also remains with both Drainage tapes 4.5 in contact. The guide section 6 has a length of about 140 cm.

Das untere Entwässerungsband 5 wird in einem Teil der Führungsstrecke 6 über eine quer zur Faserstoffbahn 1 verlaufende Saugvorrichtung 7 geführt, welche über einen Anschluß 15 mit einer Unterdruckquelle verbunden ist. Die Saugvorrichtung 6 beginnt ca. 60 cm nach dem Preßspalt. Der Unterdruck wirkt durch mehrere Saugschlitze der Saugvorrichtung 7 auf das untere Entwässerungsband 5 ein und behindert somit eine Rückbefeuchtung der Faserstoffbahn 1 von diesem Entwässerungsband 5 her, wobei die Saugschlitze die gleiche Breite haben. Außerdem wird hiermit die Haftung am unteren Entwässerungsband 5 erhöht und eine Ablösung der Faserstoffbahn 1 vom oberen Entwässerungsband 4 bewirkt. Die in ihrer Länge in Bahnlaufrichtung 8 bezüglich der Führungsstrecke 6 kurze Saugvorrichtung 7 stellt einen guten Kompromiß zwischen Aufwand und Wirkung dar.The lower dewatering belt 5 is guided in a part of the guide path 6 via a transverse to the fibrous web 1 suction device 7, which is connected via a terminal 15 with a vacuum source. The suction device 6 begins about 60 cm after the press nip. The negative pressure acts through a plurality of suction slots of the suction device 7 on the lower dewatering belt 5 and thus hinders a rewetting of the fibrous web 1 of this dewatering belt 5 forth, wherein the suction slots have the same width. In addition, the adhesion to the lower dewatering belt 5 is hereby increased and a detachment of the fibrous web 1 from the upper dewatering belt 4 is effected. The short in length in the web running direction 8 with respect to the guide path 6 short suction device 7 represents a good compromise between effort and effect.

Am Ende der Führungsstrecke 6 läuft die Faserstoffbahn 1 nur mit dem unteren Entwässerungsband 5 weiter. Um trotz der Wegführung des oberen Entwässerungsbandes 4 eine sichere Führung gewährleisten zu können, wird das untere Entwässerungsband 5 am Ende der Führungsstrecke 6 über eine weitere Sauganordnung 10 in Form einer besaugten Walze geführt. Angedeutet ist dabei das Abstreifen von Wasser und Luft über einen separat gelagerten Abstreifer 19 zur Erhöhung der Wirksamkeit der besaugten Walze. Der Abstreifer 19 wird dabei über einen quer zur Maschine verlaufenden Luftschlauch an den Mantel der besaugten Walze gepreßt.At the end of the guide track 6, the fibrous web 1 continues to run only with the lower dewatering belt 5. In order to ensure a safe guide despite the routing of the upper dewatering belt 4, the lower dewatering belt 5 is guided at the end of the guide section 6 via a further suction assembly 10 in the form of a vacuumed roller. It indicates the stripping of water and air via a separately mounted scraper 19 to increase the efficiency of the evacuated roll. The scraper 19 is pressed via a transverse to the machine air hose to the jacket of the evacuated roll.

Am Anfang und am Ende der Saugvorrichtung 7 ist je eine quer zur Faserstoffbahn 1 verlaufende und mit dem unteren Entwässerungsband 5 in Kontakt stehende Abstreifleiste 9 zur Wasserableitung angeordnet. Der Unterdruck der Saugvorrichtung 7 erhöht die Anpressung des unteren Entwässerungsbandes 5 an die Abstreifleisten 9, so daß diese verstärkt Wasser vom unteren Entwässerungsband 5 abführen können. Die Abstreifleisten 9 haben eine vergleichmäßigende Wirkung auf den Wassergehalt im unteren Entwässerungsband 5, was sich vorteilhaft auf das Feuchte-Querprofil der Faserstoffbahn 1 auswirkt.At the beginning and at the end of the suction device 7 each one transverse to the fibrous web 1 extending and standing with the lower dewatering belt 5 in contact wiper strip 9 is arranged for water discharge. The negative pressure of the suction device 7 increases the contact pressure of the lower dewatering belt 5 to the squeegee 9, so that they can increasingly remove water from the lower dewatering belt 5. The squeegee 9 have a comparative effect on the Water content in the lower dewatering belt 5, which has an advantageous effect on the moisture profile of the fibrous web 1.

Die in Bahnlaufrichtung 8 erste Abstreifleiste 9 ist gemeinsam mit der Saugvorrichtung 7 Teil einer, das abgeschleuderte und abgestreifte Wasser aufnehmenden Wasserauffangvorrichtung 17. Diese nimmt auch das von einem Schaber 16 von der unteren Presswalze 3 abgeschabte Wasser auf. Außerdem wird hier auch die Möglichkeit zur Anordnung eines Leitbleches 18 gezeigt, welches vor der ersten Abstreifleiste 9 angeordnet ist und das abgeschleuderte Wasser der unteren Presswalze 3 ableitet.The first squeegee strip 9 in the direction of web travel 8 is part of a water collecting device 17 which collects the thrown off and stripped water, together with the suction device 7. The latter also absorbs the water scraped off by a scraper 16 from the lower pressing roller 3. In addition, the possibility for the arrangement of a guide plate 18 is shown here, which is arranged in front of the first squeegee 9 and the discharged water of the lower pressure roller 3 derives.

Zur Aufnahme des von der oberen Presswalze 2 abgeschleuderten Wassers ist im Auslaufzwickel zwischen der oberen Presswalze 2 und dem oberen Entwässerungsband 4 eine Wasseraufnahmevorrichtung 11 in Form einer bekannten Wasserrinne vorgesehen.For receiving the thrown off from the upper pressure roller 2 water is provided in the outlet gusset between the upper pressure roller 2 and the upper dewatering belt 4, a water intake device 11 in the form of a known gutter.

Die Walzenmäntel 12 beider Presswalzen 2,3 werden über die Stützelemente 13,14 gegeneinander gepreßt. Zur Ausbildung eines verlängerten Preßspaltes ist der Walzenmantel 12 der oberen Presswalze 2 flexibel ausgebildet und besitzt das Stützelement 13 der oberen Presswalze 2 eine konkave Anpressfläche. Im Gegensatz hierzu ist der Walzenmantel 12 der unteren Presswalze 3 relativ formstabil und die Anpressfläche dieses Stützelementes 14 konvex. Dies ist jedoch nur beispielhaft zu sehen.The roll coats 12 of both press rolls 2, 3 are pressed against one another via the support elements 13, 14. To form an extended press nip, the roll shell 12 of the upper press roll 2 is designed to be flexible and the support element 13 of the upper press roll 2 has a concave contact surface. In contrast, the roll shell 12 of the lower press roll 3 is relatively dimensionally stable and the contact surface of this support element 14 convex. However, this is only an example.

Claims (20)

  1. Pressing arrangement for dewatering a paper, board, tissue or another fibrous web (1) in a machine for manufacturing and/or finishing the former, comprising at least one pressure nip which is formed by two press rolls (2, 3) which are pressed against one another, through which pressure nip at least one dewatering belt (4) which extends above the fibrous web (1) and at least one dewatering belt (5) which extends below the fibrous web (1) run, in addition to the fibrous web (1), the fibrous web (1) being in contact with the upper dewatering belt (4) and the lower dewatering belt (5) after the pressure nip in an adjoining guide section (6), and the lower dewatering belt (5) being guided, in the region of the guide section (6), over at least one suction apparatus (7) which extends transversely with respect to the fibrous web (1) and is connected to a vacuum source, characterized in that a wiping strip (9) which extends transversely with respect to the fibrous web (1) and is in contact with the lower dewatering belt (5) is arranged at the beginning and/or at the end of the suction apparatus (7), for guiding away water.
  2. Pressing arrangement according to Claim 1, characterized in that the suction apparatus (7) extends only over a part of the guide section (6), as viewed in the web running direction (8), and preferably ends before the end of the guide section (6).
  3. Pressing arrangement according to Claim 2, characterized in that the suction apparatus (7) is preferably configured as a suction box which begins in a region between 40 and 80 cm after the pressure nip.
  4. Pressing arrangement according to one of the preceding claims, characterized in that the suction apparatus (7) has one or more, preferably between one and three suction slots opposite the dewatering belt (5).
  5. Pressing arrangement according to Claim 4, characterized in that the suction slots have a width of from 10 to 30 mm.
  6. Pressing arrangement according to Claim 5, characterized in that the suction slots have the same width.
  7. Pressing arrangement according to Claim 5, characterized in that the suction slots have different widths.
  8. Pressing arrangement according to one of the preceding claims, characterized in that the suction apparatus (7) has a vacuum applied to it between 0.1 and 0.4 bar.
  9. Pressing arrangement according to one of the preceding claims, characterized in that the suction apparatus (7) is mounted pivotably.
  10. Pressing arrangement according to one of the preceding claims, characterized in that at least one spray tube is situated in the suction apparatus (7) for cleaning the interior and/or the suction slots.
  11. Pressing arrangement according to one of the preceding claims, characterized in that the guide section (6) has a length between 100 and 180 cm.
  12. Pressing arrangement according to one of the preceding claims, characterized in that the wiping strip (9) is arranged at the start of the suction apparatus (7) and is configured in such a way that firstly it can wipe off water from the lower dewatering belt (5) and secondly can guide away the water which is thrown off from the roll cover (12) of the lower press roll (3).
  13. Pressing arrangement according to one of the preceding claims, characterized in that a guide plate (18) or guide element is arranged in front of the suction apparatus (7) for guiding away the water which is thrown off from the roll cover (12) of the lower press roll (3).
  14. Pressing arrangement according to one of the preceding claims, characterized in that the fibrous web (1) continues to run only with the lower dewatering belt (5) after the guide section (6).
  15. Pressing arrangement according to Claim 6, characterized in that the lower dewatering belt (5) is guided over a further suction arrangement (10), preferably in the form of an evacuated roll, at the end of the guide section (6).
  16. Pressing arrangement according to Claim 15, characterized in that the suction apparatus (7) comprises a stripper (19) which serves to strip off air and water from the evacuated roll.
  17. Pressing arrangement according to Claim 16, characterized in that the stripper (19) can be pressed onto the cover of the evacuated roll via an air hose which extends transversely with respect to the machine.
  18. Pressing arrangement according to Claim 16 or 17, characterized in that the stripper (19) is mounted separately.
  19. Pressing arrangement according to one of the preceding claims, characterized in that, after the pressure nip, the upper dewatering belt (4) is assigned a water receiving apparatus (11), preferably in the form of a water gutter.
  20. Pressing arrangement according to one of the preceding claims, characterized in that at least the roll cover (12) of a press roll (2, 3) is pressed towards the pressure nip by a supporting element (13, 14), and the pressure nip is preferably of extended configuration.
EP20000122518 1999-11-16 2000-10-14 Pressing arrangement Expired - Lifetime EP1101862B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE1999155030 DE19955030A1 (en) 1999-11-16 1999-11-16 Transfer of paper/cardboard web between stations in papermaking/cardboard machine, comprises shifting movements of delivery and pick-up belts for clean and rapid transfer without loss of production time
DE19955030 1999-11-16
DE10030048 2000-06-19
DE2000130048 DE10030048A1 (en) 2000-06-19 2000-06-19 Press section for a wet paper/cardboard has a suction box against the lower press belt in the movement path after the roller press gap to prevent extracted water returning to the web

Publications (3)

Publication Number Publication Date
EP1101862A2 EP1101862A2 (en) 2001-05-23
EP1101862A3 EP1101862A3 (en) 2001-11-07
EP1101862B1 true EP1101862B1 (en) 2007-04-11

Family

ID=26006138

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000122518 Expired - Lifetime EP1101862B1 (en) 1999-11-16 2000-10-14 Pressing arrangement

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Country Link
EP (1) EP1101862B1 (en)
DE (1) DE50014234D1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10108517A1 (en) * 2001-02-22 2002-08-29 Voith Paper Patent Gmbh Moisture profile
CN113521632B (en) * 2021-07-12 2022-09-13 曾翔 Fire hose winding device
CN114234570A (en) * 2021-11-09 2022-03-25 衡阳同禧透气包装有限公司 Drying device is used in wrapping paper production

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI110440B (en) * 1996-04-04 2003-01-31 Metso Paper Inc Transferring the web from the last press nip in the paper machine to the next drying section
DE19644110A1 (en) * 1996-10-31 1998-05-07 Voith Sulzer Papiermasch Gmbh Suction box

Also Published As

Publication number Publication date
EP1101862A2 (en) 2001-05-23
DE50014234D1 (en) 2007-05-24
EP1101862A3 (en) 2001-11-07

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