EP1777340B1 - Pressing arrangement - Google Patents

Pressing arrangement Download PDF

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Publication number
EP1777340B1
EP1777340B1 EP06121946A EP06121946A EP1777340B1 EP 1777340 B1 EP1777340 B1 EP 1777340B1 EP 06121946 A EP06121946 A EP 06121946A EP 06121946 A EP06121946 A EP 06121946A EP 1777340 B1 EP1777340 B1 EP 1777340B1
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EP
European Patent Office
Prior art keywords
arrangement according
fibrous web
press
roll
press arrangement
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EP06121946A
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German (de)
French (fr)
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EP1777340A1 (en
Inventor
Daniel Gronych
Helmut Sterz
Robert Koplin
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1777340A1 publication Critical patent/EP1777340A1/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
    • D21F3/04—Arrangements thereof

Definitions

  • the invention relates to a pressing arrangement according to the preamble of claim 1.
  • a pressing arrangement is known from EP-A-1 316 641 known..
  • Multi-press nip press assemblies are known, for example, in compact form with a central roll involved in multiple press nips.
  • the object of the invention is therefore to reduce the roughness and roughness two-sidedness of the fibrous web and, if possible, also to improve the web guide.
  • the opposite, smooth contact surfaces of the smoothing roller and the transfer belt provide for a relatively equilateral smoothing of the fibrous web and thus for a reduction of the roughness and the Rauhtechnikszwei supramony.
  • the number of water-absorbing drainage tapes is sufficient and the inventive arrangement with two dewatering belts on both sides of the fibrous web provides for an approximately symmetrical drainage.
  • the fibrous web should as far as possible be supported in the entire area of the pressing arrangement, preferably of at least one band or one roller. This is particularly important because of the high moisture content and thus the relatively low strength of the fibrous web in this area of importance.
  • the dewatering belt of the second press nip should take over the fibrous web from the opposite with respect to the fibrous web dewatering belt of the first press nip and the fibrous web after the second press nip of transfer preferably under the fibrous web transfer belt to an air-permeable transfer belt.
  • the transfer belt should wrap around an evacuated guide roll during the takeover of the fibrous web.
  • the negative pressure of this guide roller sucks the fibrous web to the transfer belt and increases the adhesion to this.
  • the dewatering belt of the third press nip should take over the fibrous web from the transfer belt. It is advantageous if the Dewatering belt takes over the fibrous web in the evacuated wrap area of the evacuated press roll.
  • the negative pressure of the evacuated pressure roller ensures the suction of the fibrous web to the acquiring dewatering belt.
  • the fibrous web can then be transferred from the dewatering belt of the third press nip to an air-permeable belt of a following machine unit, preferably a dryer group.
  • the first and / or the second press nip preferably both press nips should be made extended.
  • the extended press nip can be formed by a preferably arranged above the fibrous web shoe press roll and a cylindrical counter roll.
  • the smoothing roll should have a coating, preferably of ceramic.
  • the delivery of the fibrous web from the smoothing roll to the dewatering belt can also be assisted by the diameter of the smoothing roll being smaller than or equal to the diameter of the evacuated press roll.
  • the evacuated press roll should have several, preferably in the web running direction one behind the other have lying suction zones. An adaptation is so easy on the extent, the location and the different degrees of suction of the zones possible.
  • the evacuated press roll in the region of the press nip has a high vacuum zone, which preferably also extends in the web running direction beyond.
  • the increased negative pressure ensures a water removal of the water pressed out of the fibrous web and for a strong adhesion of the fibrous web to the dewatering belt, so that the fibrous web, in particular after the press nip, reliably releases from the smooth lateral surface of the smoothing roll.
  • the negative pressure in the high vacuum zone should be between 10 and 60 kPa.
  • the negative pressure in the suction area of the evacuated press roll outside the high vacuum zone should be below 30 kPa.
  • This negative pressure is sufficient to ensure the acquisition and the maintenance of the fibrous web on the dewatering belt to the third press nip in sufficient form.
  • the vacuum can suck the water thrown off the dewatering belt into the press roller. Therefore, the suction area of the evacuated press roll should extend beyond the wrap area of the drainage tape in the web running direction.
  • the thrown off water can alternatively or additionally be collected by a gully.
  • the transfer belt should have a hardness of not more than 80, preferably not more than 50 P & J.
  • the roughness Rz of the transfer belt should be between 5 and 50 microns.
  • the transfer belt In order not to impair the fibrous web surface, the transfer belt should be designed as a markarmarmes, still permeable, non-rewet, preferably as a dryer.
  • the vacuumed press roller is driven speed-controlled. This allows the creation of a turn.
  • the guide roller of the transfer belt should also preferably be speed-controlled to be able to produce a synchronization with the evacuated press roll.
  • the smoothing roller is also driven. This should be done momentary in normal operation.
  • the third press nip should be opened during the transfer of the fibrous web. It is advantageous if the smoothing roller is preferably driven speed-controlled in preparation for the closing of the press nip.
  • the fibrous web 1 is transferred from a forming wire 2 of a former upstream of the press assembly for forming the paper machine to an upper water-absorbing dewatering belt 3 of a first press nip of the press assembly. This transfer is supported by a looped by the dewatering belt 3, suctioned guide roll.
  • This dewatering belt 3 leads the fibrous web 1 together with a lower water-absorbing dewatering belt 4 through the first press nip.
  • the fibrous web 1 is still passed together via a transfer line from both dewatering belts 3,4, before the upper dewatering belt 3 is led away from the fibrous web 1.
  • the lower dewatering belt 4 then transfers the fibrous web 1 to an upper, water-absorbing dewatering belt 5 of a second press nip. Through this second press nip, the fibrous web 1 runs together with a lower smooth transfer belt. 6
  • Both press gaps are elongated and are formed by an upper shoe press roll 11,13 and a lower cylindrical counter roll 10,12.
  • the shoe press rolls 11, 13 have a flexible roll shell, which is pressed by a pressing element with a concave pressing surface to the respective counter roll 10, 12.
  • the resulting, extended press nip allows for gentle, yet intensive dewatering.
  • the upper dewatering belt 5 is led away from the fibrous web 1. This is not a problem since the fibrous web 1 adheres much more to the smooth transfer belt 6 than to the opposite dewatering belt 5.
  • the fibrous web is transferred after an air-permeable transfer belt 7 in the form of a low-mark drying fabric.
  • This transfer is supported by a, coiled by the transfer belt 7 and sucked guide roller 14 by the negative pressure of this guide roller 14 sucks the fibrous web 1 to the transfer belt 7.
  • This transfer belt 7 leads the fibrous web 1 to a further, lower, water-absorbing dewatering belt 8 of a third press nip.
  • This third press nip is formed by a press roll 16 looped around the dewatering belt 8 and an upper smoothing roll 15. In this case, the transfer of the fibrous web 1 takes place while the dewatering belt 8 wraps around the evacuated press roll 16.
  • the dewatering belt 8 transfers the fibrous web 1 to an air-permeable belt 9 in the form of a dryer wire of a following drying group of a dryer section of the machine, which is supported by a suctioned, coiled guide roller 17.
  • the fibrous web 1 is guided for drying over heated drying cylinders 18, wherein the drying wire presses the fibrous web 1 against its lateral surface.
  • the fibrous web 1 is constantly supported by a belt within the press assembly, so that the web guide becomes much more stable and secure, allowing much higher machine speeds.
  • each side of the fibrous web 1 comes in contact with as many (two) relatively rough dewatering bands 3,4,5,8, which reduces the roughness two-sidedness.
  • the drainage bands 3, 4, 5, 7, 8 of the press arrangement are not only water-absorbent, but also permeable to air and designed as press felt.
  • the air permeability allows the support of the railway transfer by suctioned guide rollers 14th
  • the transfer belt 6 should have not only a smooth contact surface with respect to the fibrous web 1, but also a hardness of about 50 P & J. This ensures a sufficient load capacity.
  • the roughness Rz of the transfer belt 6 should be between 5 and 50 micrometers.
  • the dewatering belt 8 of the third press nip should not only be water-absorbent and air-permeable, but also as smooth as possible. This supports the smoothing of the fibrous web 1 in the third press nip and increases the adhesion of the fibrous web 1 to the dewatering belt 8.
  • the dewatering belt should have 8 fibers with at most 11 dtex or a coating with polymers or an increased number of hot melt adhesive fibers on the contact side to the fibrous web 1.
  • blowing device 20 in the gusset of the outgoing press nip, which directs blowing air in particular between the smoothing roll 15 and the fibrous web 1 when transferring.
  • This smoothing roll 15 is provided to ensure sufficient smoothness with a ceramic coating.
  • the evacuated press roll 16 has a plurality of suction zones 21, 22, 23, 24 arranged one behind the other in the web running direction 19.
  • All other suction zones 22, 23, 24 have a negative pressure of less than 30 kPa.
  • the holding zone 22 should only guide the fibrous web 1 safely to the press nip.
  • a post-zone 24 adjoins, which is intended to suck in the water thrown off this after the removal of the dewatering belt 8.
  • a Wasserrrine 25 between the evacuated pressure roller 16 and the draining drainage belt eighth
  • the smoothing roller 15 is lifted and driven speed controlled during this time. This facilitates the subsequent closing of the press nip with the likewise speed-driven, sucked press roller 16.
  • this guide roller 14 is driven speed controlled.
  • This press arrangement not only reduces the two-sidedness of the fibrous web 1 but also enables higher dry contents to be achieved at very high machine speeds.

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  • Paper (AREA)
  • Glass Compositions (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Press Drives And Press Lines (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Press arrangement for dewatering a paper web comprises a first nip through which the web passes between two water-absorbing dewatering belts (3, 4), a second nip through which the web passes between a water-absorbing dewatering belt (5) and a smooth transfer belt (6), and a third nip comprising a speed-controlled suction roll (16) in contact with a water-absorbing dewatering belt (8) and a driven calender roll (15) in contact with the web on the side opposite to belt (6).

Description

Die Erfindung betrifft eine Pressanordnung gemäß dem Oberbegriff des Anspruchs 1. Eine derartige Pressanordnung ist aus der EP-A-1 316 641 bekannt..The invention relates to a pressing arrangement according to the preamble of claim 1. Such a pressing arrangement is known from EP-A-1 316 641 known..

Pressanordnungen mit mehreren Pressspalten sind beispielsweise in kompakter Form mit einer Zentralwalze, welche an mehreren Pressspalten beteiligt ist, bekannt.Multi-press nip press assemblies are known, for example, in compact form with a central roll involved in multiple press nips.

Dabei kommt es zu einer überwiegend einseitigen Entwässerung auf der, der Zentralwalze gegenüberliegenden Seite der Faserstoffbahn. Außerdem erfolgt die Übergabe der Faserstoffbahn nach der Zentralwalze oft ungestützt. Dies erhöht die Gefahr eines Abrisses der Faserstoffbahn und begrenzt so die Maschinengeschwindigkeit.This results in a predominantly one-sided drainage on the side opposite the central roller side of the fibrous web. In addition, the transfer of the fibrous web after the central roll is often unsupported. This increases the risk of tearing the fibrous web and thus limits the machine speed.

Andere Pressanordnungen besitzen mehrere, hintereinander angeordnete, doppelt befilzte Pressspalte. Dies ermöglicht zwar eine geschlossene Führung der Faserstoffbahn, führt jedoch zu einer erhöhten Rauhigkeit durch den Kontakt mit den Pressfilzen und oft sogar noch zu einer erhöhten Rauhigkeitszweiseitigkeit der Faserstoffbahn.Other press arrangements have several, successively arranged, double-felted press nips. Although this allows a closed guidance of the fibrous web, but leads to an increased roughness by the contact with the press felts and often even to an increased roughness two-sidedness of the fibrous web.

Die Aufgabe der Erfindung ist es daher, die Rauhigkeit und die Rauhigkeitszweiseitigkeit der Faserstoffbahn zu vermindern und möglichst auch die Bahnführung zu verbessern.The object of the invention is therefore to reduce the roughness and roughness two-sidedness of the fibrous web and, if possible, also to improve the web guide.

Diese Aufgabe ist durch die Merkmale des Anspruchs 1 gelöst.This object is solved by the features of claim 1.

Dabei sorgen die gegenüberliegenden, glatten Kontaktflächen der Glättwalze und des Transferbandes für eine relativ gleichseitige Glättung der Faserstoffbahn und damit für eine Verminderung der Rauhigkeit sowie der Rauhigkeitszweiseitigkeit.The opposite, smooth contact surfaces of the smoothing roller and the transfer belt provide for a relatively equilateral smoothing of the fibrous web and thus for a reduction of the roughness and the Rauhigkeitszweiseitigkeit.

Die Anzahl der wasseraufnehmenden Entwässerungsbänder ist ausreichend und die erfindungsgemäße Anordnung mit zwei Entwässerungsbändern auf beiden Seiten der Faserstoffbahn sorgt für eine etwa symmetrische Entwässerung.The number of water-absorbing drainage tapes is sufficient and the inventive arrangement with two dewatering belts on both sides of the fibrous web provides for an approximately symmetrical drainage.

Um die Abrissgefahr zu vermindern und höhere Maschinengeschwindigkeiten zu ermöglichen, sollte die Faserstoffbahn möglichst im gesamten Bereich der Pressanordnung, vorzugsweise von zumindest einem Band oder einer Walze, gestützt verlaufen. Dies ist insbesondere wegen des hohen Feuchtegehaltes und damit der relativ geringen Festigkeit der Faserstoffbahn in diesem Bereich von Bedeutung.In order to reduce the risk of demolition and to allow higher machine speeds, the fibrous web should as far as possible be supported in the entire area of the pressing arrangement, preferably of at least one band or one roller. This is particularly important because of the high moisture content and thus the relatively low strength of the fibrous web in this area of importance.

Daher sollte das Entwässerungsband des zweiten Pressspaltes die Faserstoffbahn vom bezüglich der Faserstoffbahn gegenüberliegenden Entwässerungsband des ersten Pressspaltes übernehmen und die Faserstoffbahn nach dem zweiten Pressspalt vom vorzugsweise unter der Faserstoffbahn laufenden Transferband an ein luftdurchlässiges Übergabeband übergeben werden.Therefore, the dewatering belt of the second press nip should take over the fibrous web from the opposite with respect to the fibrous web dewatering belt of the first press nip and the fibrous web after the second press nip of transfer preferably under the fibrous web transfer belt to an air-permeable transfer belt.

Um die Übernahme der Faserstoffbahn zu unterstützen, sollte das Übergabeband während der Übernahme der Faserstoffbahn eine besaugte Leitwalze umschlingen. Der Unterdruck dieser Leitwalze saugt die Faserstoffbahn an das Übergabeband und verstärkt die Haftung an diesem.To support the takeover of the fibrous web, the transfer belt should wrap around an evacuated guide roll during the takeover of the fibrous web. The negative pressure of this guide roller sucks the fibrous web to the transfer belt and increases the adhesion to this.

Anschließend sollte das Entwässerungsband des dritten Pressspaltes die Faserstoffbahn vom Übergabeband übernehmen. Dabei ist es vorteilhaft, wenn das Entwässerungsband die Faserstoffbahn im besaugten Umschlingungsbereich der besaugten Presswalze übernimmt.Subsequently, the dewatering belt of the third press nip should take over the fibrous web from the transfer belt. It is advantageous if the Dewatering belt takes over the fibrous web in the evacuated wrap area of the evacuated press roll.

Auch hierbei sorgt der Unterdruck der besaugten Presswalze für das Ansaugen der Faserstoffbahn an das übernehmende Entwässerungsband.Again, the negative pressure of the evacuated pressure roller ensures the suction of the fibrous web to the acquiring dewatering belt.

Mit Vorteil kann dann die Faserstoffbahn vom Entwässerungsband des dritten Pressspaltes an ein luftdurchlässiges Band einer folgenden Maschineneinheit, vorzugsweise einer Trockengruppe übergeben werden.Advantageously, the fibrous web can then be transferred from the dewatering belt of the third press nip to an air-permeable belt of a following machine unit, preferably a dryer group.

Auf diese Weise ergibt sich eine geschlossene Führung der Faserstoffbahn durch die Pressanordnung.In this way, a closed guidance of the fibrous web results by the pressing arrangement.

Um eine möglichst intensive und dennoch schonende Entwässerung der Faserstoffbahn zu ermöglichen, sollten der erste und/oder der zweite Pressspalt, vorzugsweise beide Pressspalte verlängert ausgeführt sein.In order to allow as intensive and yet gentle dewatering of the fibrous web, the first and / or the second press nip, preferably both press nips should be made extended.

In besonders einfacher Ausführung kann dabei der verlängerte Pressspalt von einer vorzugsweise über der Faserstoffbahn angeordneten Schuh-Presswalze und einer zylindrischen Gegenwalze gebildet werden.In a particularly simple embodiment of the extended press nip can be formed by a preferably arranged above the fibrous web shoe press roll and a cylindrical counter roll.

Zur Gewährleistung einer ausreichenden Glätte sowie einer möglichst geringen Haftung der Faserstoffbahn sollte die Glättwalze eine Beschichtung, vorzugsweise aus Keramik aufweisen.To ensure sufficient smoothness and the lowest possible adhesion of the fibrous web, the smoothing roll should have a coating, preferably of ceramic.

Die Abgabe der Faserstoffbahn von der Glättwalze an das Entwässerungsband kann auch noch dadurch unterstützt werden, dass der Durchmesser der Glättwalze kleiner als der oder gleich dem Durchmesser der besaugten Presswalze ist.The delivery of the fibrous web from the smoothing roll to the dewatering belt can also be assisted by the diameter of the smoothing roll being smaller than or equal to the diameter of the evacuated press roll.

Um die Besaugung der Presswalze an die Erfordernisse anpassen zu können, sollte die besaugte Presswalze mehrere, vorzugsweise in Bahnlaufrichtung hintereinander liegende Saugzonen aufweisen. Eine Anpassung ist so einfach über die Ausdehnung, die Lage und die unterschiedlich starke Besaugung der Zonen möglich.In order to be able to adapt the suction of the press roll to the requirements, the evacuated press roll should have several, preferably in the web running direction one behind the other have lying suction zones. An adaptation is so easy on the extent, the location and the different degrees of suction of the zones possible.

Dabei ist es vorteilhaft, wenn die besaugte Presswalze im Bereich des Pressspaltes eine Hochvakuumzone besitzt, die sich vorzugsweise auch in Bahnlaufrichtung darüber hinaus erstreckt.It is advantageous if the evacuated press roll in the region of the press nip has a high vacuum zone, which preferably also extends in the web running direction beyond.

Der erhöhte Unterdruck sorgt für eine Wasserabfuhr des aus der Faserstoffbahn gepressten Wassers und für eine starke Haftung der Faserstoffbahn am Entwässerungsband, so dass sich die Faserstoffbahn insbesondere nach dem Pressspalt von der glatten Mantelfläche der Glättwalze sicher löst.The increased negative pressure ensures a water removal of the water pressed out of the fibrous web and for a strong adhesion of the fibrous web to the dewatering belt, so that the fibrous web, in particular after the press nip, reliably releases from the smooth lateral surface of the smoothing roll.

Hierfür sollte der Unterdruck in der Hochvakuumzone zwischen 10 und 60 kPa liegen.For this purpose, the negative pressure in the high vacuum zone should be between 10 and 60 kPa.

Der Unterdruck im Saugbereich der besaugten Presswalze außerhalb der Hochvakuumzone sollte unter 30 kPa liegen.The negative pressure in the suction area of the evacuated press roll outside the high vacuum zone should be below 30 kPa.

Dieser Unterdruck reicht aus, um die Übernahme und das Halten der Faserstoffbahn am Entwässerungsband bis zum dritten Pressspalt in ausreichender Form zu gewährleisten.This negative pressure is sufficient to ensure the acquisition and the maintenance of the fibrous web on the dewatering belt to the third press nip in sufficient form.

Nach dem Umschlingungsbereich des Entwässerungsbandes kann der Unterdruck das von dem Entwässerungsband abgeschleuderte Wasser in die Presswalze saugen. Daher sollte sich der Saugbereich der besaugten Presswalze in Bahnlaufrichtung über den Umschlingungsbereich des Entwässerungsbandes hinaus erstrecken.After the looping area of the dewatering belt, the vacuum can suck the water thrown off the dewatering belt into the press roller. Therefore, the suction area of the evacuated press roll should extend beyond the wrap area of the drainage tape in the web running direction.

Das abgeschleuderte Wasser kann alternativ oder ergänzend auch von einer Wasserrinne aufgefangen werden.The thrown off water can alternatively or additionally be collected by a gully.

Um eine ausreichende Glätte und Belastbarkeit gewährleisten zu können, sollte das Transferband eine Härte von maximal 80, vorzugsweise maximal 50 P&J aufweisen. Die Rauhigkeit Rz des Transferbandes sollte zwischen 5 und 50 Mikrometer liegen.In order to ensure sufficient smoothness and resilience, the transfer belt should have a hardness of not more than 80, preferably not more than 50 P & J. The roughness Rz of the transfer belt should be between 5 and 50 microns.

Um die Faserstoffbahnoberfläche nicht zu beeinträchtigen, sollte das Übergabeband als markierungsarmes, noch permeables, nicht rückfeuchtendes Band, vorzugsweise als Trockensieb ausgebildet sein.In order not to impair the fibrous web surface, the transfer belt should be designed as a markarmarmes, still permeable, non-rewet, preferably as a dryer.

Die besaugte Presswalze wird drehzahlgesteuert angetrieben . Dies erlaubt die Erzeugung eines Zuges.The vacuumed press roller is driven speed-controlled. This allows the creation of a turn.

Die Leitwalze des Übergabebandes sollte ebenfalls vorzugsweise drehzahlgesteuert angetrieben werden, um einen Gleichlauf mit der besaugten Presswalze herstellen zu können.The guide roller of the transfer belt should also preferably be speed-controlled to be able to produce a synchronization with the evacuated press roll.

Auch die Glättwalze wird angetrieben. Dies sollte im Normalbetrieb momentgesteuert erfolgen.The smoothing roller is also driven. This should be done momentary in normal operation.

Um das Überführen der Faserstoffbahn zu ermöglichen oder zumindest zu vereinfachen, sollte der dritte Pressspalt während des Überführens der Faserstoffbahn geöffnet werden. Dabei ist es von Vorteil, wenn die Glättwalze in Vorbereitung des Schließens des Pressspaltes vorzugsweise drehzahlgesteuert angetrieben wird.In order to facilitate or at least simplify the transfer of the fibrous web, the third press nip should be opened during the transfer of the fibrous web. It is advantageous if the smoothing roller is preferably driven speed-controlled in preparation for the closing of the press nip.

Wegen der glatten Mantelfläche der Glättwalze und der damit verbundenen verstärkten Haftung der Faserstoffbahn sollte sich im öffnenden Zwickel nach dem dritten Pressspalt eine Blaseinrichtung befinden, welche insbesondere beim Überführen Blasluft zwischen die Glättwalze und die Faserstoffbahn richtet.Because of the smooth surface of the smoothing roller and the associated increased adhesion of the fibrous web should be in the opening gusset after the third press nip blower, which in particular directs blowing air between the smoothing roll and the fibrous web during transfer.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur einen schematischen Querschnitt durch eine 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 pressing arrangement.

Die Faserstoffbahn 1 wird von einem Formersieb 2 eines der Pressanordnung vorgelagerten Formers zur Blattbildung der Papiermaschine an ein oberes wasseraufnehmendes Entwässerungsband 3 eines ersten Pressspaltes der Pressanordnung übergeben. Diese Übergabe wird von einer vom Entwässerungsband 3 umschlungenen, besaugten Leitwalze unterstützt.The fibrous web 1 is transferred from a forming wire 2 of a former upstream of the press assembly for forming the paper machine to an upper water-absorbing dewatering belt 3 of a first press nip of the press assembly. This transfer is supported by a looped by the dewatering belt 3, suctioned guide roll.

Dieses Entwässerungsband 3 führt die Faserstoffbahn 1 gemeinsam mit einem unteren wasseraufnehmenden Entwässerungsband 4 durch den ersten Pressspalt.This dewatering belt 3 leads the fibrous web 1 together with a lower water-absorbing dewatering belt 4 through the first press nip.

Nach diesem ersten Pressspalt wird die Faserstoffbahn 1 noch über eine Transferstrecke gemeinsam von beiden Entwässerungsbändern 3,4 geführt, bevor das obere Entwässerungsband 3 von der Faserstoffbahn 1 weggeleitet wird.After this first press nip, the fibrous web 1 is still passed together via a transfer line from both dewatering belts 3,4, before the upper dewatering belt 3 is led away from the fibrous web 1.

Das untere Entwässerungsband 4 übergibt anschließend die Faserstoffbahn 1 an ein oberes, wasseraufnehmendes Entwässerungsband 5 eines zweiten Pressspaltes. Durch diesen zweiten Pressspalt läuft die Faserstoffbahn 1 gemeinsam mit einem unteren glatten Transferband 6.The lower dewatering belt 4 then transfers the fibrous web 1 to an upper, water-absorbing dewatering belt 5 of a second press nip. Through this second press nip, the fibrous web 1 runs together with a lower smooth transfer belt. 6

Beide Pressspalte sind verlängert ausgeführt und werden von einer oberen Schuh-Presswalze 11,13 und einer unteren zylindrischen Gegenwalze 10,12 gebildet. Die Schuh-Presswalzen 11,13 besitzen einen flexiblen Walzenmantel, der von einem Anpresselement mit konkaver Pressfläche zur jeweiligen Gegenwalze 10,12 gedrückt wird.Both press gaps are elongated and are formed by an upper shoe press roll 11,13 and a lower cylindrical counter roll 10,12. The shoe press rolls 11, 13 have a flexible roll shell, which is pressed by a pressing element with a concave pressing surface to the respective counter roll 10, 12.

Der dabei entstehende, verlängerte Pressspalt ermöglicht wegen der längeren Verweilzeit der Faserstoffbahn 1 eine schonende und dennoch intensive Entwässerung.Due to the longer residence time of the fibrous web 1, the resulting, extended press nip allows for gentle, yet intensive dewatering.

Nach dem zweiten Pressspalt wird das obere Entwässerungsband 5 von der Faserstoffbahn 1 weggeführt. Dies ist unproblematisch, da die Faserstoffbahn 1 wesentlich stärker am glatten Transferband 6 als am gegenüberliegenden Entwässerungsband 5 haftet.After the second press nip, the upper dewatering belt 5 is led away from the fibrous web 1. This is not a problem since the fibrous web 1 adheres much more to the smooth transfer belt 6 than to the opposite dewatering belt 5.

Von diesem Transferband 6 wird die Faserstoffbahn im Anschluss an ein luftdurchlässiges Übergabeband 7 in Form eines markierungsarmen Trockensiebes übergeben. Diese Übergabe wird von einer, vom Übergabeband 7 umschlungenen und besaugten Leitwalze 14 unterstützt, indem der Unterdruck dieser Leitwalze 14 die Faserstoffbahn 1 an das Übergabeband 7 saugt.From this transfer belt 6, the fibrous web is transferred after an air-permeable transfer belt 7 in the form of a low-mark drying fabric. This transfer is supported by a, coiled by the transfer belt 7 and sucked guide roller 14 by the negative pressure of this guide roller 14 sucks the fibrous web 1 to the transfer belt 7.

Dieses Übergabeband 7 führt die Faserstoffbahn 1 an ein weiteres, unteres, wasseraufnehmendes Entwässerungsband 8 eines dritten Pressspaltes. Dieser dritte Pressspalt wird von einer vom Entwässerungsband 8 umschlungenen und besaugten Presswalze 16 und einer oberen Glättwalze 15 gebildet. Dabei erfolgt die Übergabe der Faserstoffbahn 1 während das Entwässerungsband 8 die besaugte Presswalze 16 umschlingt.This transfer belt 7 leads the fibrous web 1 to a further, lower, water-absorbing dewatering belt 8 of a third press nip. This third press nip is formed by a press roll 16 looped around the dewatering belt 8 and an upper smoothing roll 15. In this case, the transfer of the fibrous web 1 takes place while the dewatering belt 8 wraps around the evacuated press roll 16.

Nach diesem dritten Pressspalt übergibt das Entwässerungsband 8 die Faserstoffbahn 1 an ein luftdurchlässiges Band 9 in Form eines Trockensiebes einer folgenden Trockengruppe einer Trockenpartie der Maschine, was von einer vom Trockensieb umschlungenen, besaugten Leitwalze 17 unterstützt wird.After this third press nip, the dewatering belt 8 transfers the fibrous web 1 to an air-permeable belt 9 in the form of a dryer wire of a following drying group of a dryer section of the machine, which is supported by a suctioned, coiled guide roller 17.

In der Trockengruppe wird die Faserstoffbahn 1 zur Trocknung über beheizte Trockenzylinder 18 geführt, wobei das Trockensieb die Faserstoffbahn 1 gegen deren Mantelfläche drückt.In the drying group, the fibrous web 1 is guided for drying over heated drying cylinders 18, wherein the drying wire presses the fibrous web 1 against its lateral surface.

Auf diese Weise wird die Faserstoffbahn 1 innerhalb der Pressanordnung ständig von einem Band gestützt, so dass die Bahnführung wesentlich stabiler und sicherer wird, was wesentlich höhere Maschinengeschwindigkeiten erlaubt.In this way, the fibrous web 1 is constantly supported by a belt within the press assembly, so that the web guide becomes much more stable and secure, allowing much higher machine speeds.

Außerdem kommt jede Seite der Faserstoffbahn 1 mit gleich vielen (zwei) relativ rauen Entwässerungsbändern 3,4,5,8 in Kontakt, was die Rauhigkeitszweiseitigkeit vermindert.In addition, each side of the fibrous web 1 comes in contact with as many (two) relatively rough dewatering bands 3,4,5,8, which reduces the roughness two-sidedness.

Hinzu kommt die beidseitig Glättung der Faserstoffbahn 1 durch den Kontakt mit dem glatten Transferband 6 und der Glättwalze 15. Dies hat eine wesentliche Verminderung der Rauhigkeit der Faserstoffbahn 1 zur Folge.In addition, there is the smoothing of the fibrous web 1 on both sides by the contact with the smooth transfer belt 6 and the smoothing roll 15. This has a significant reduction in the roughness of the fibrous web 1 result.

Die Entwässerungsbänder 3,4,5,7,8 der Pressanordnung sind nicht nur wasseraufnehmend, sondern auch luftdurchlässig und als Pressfilz ausgebildet. Die Luftdurchlässigkeit erlaubt dabei die Unterstützung der Bahnübernahme durch besaugte Leitwalzen 14.The drainage bands 3, 4, 5, 7, 8 of the press arrangement are not only water-absorbent, but also permeable to air and designed as press felt. The air permeability allows the support of the railway transfer by suctioned guide rollers 14th

Das Transferband 6 sollte nicht nur eine glatte Kontaktfläche hinsichtlich der Faserstoffbahn 1, sondern auch eine Härte von ca. 50 P&J aufweisen. Dies gewährleistet eine ausreichende Belastbarkeit. Die Rauhigkeit Rz des Transferbandes 6 sollte zwischen 5 und 50 Mikrometer liegen.The transfer belt 6 should have not only a smooth contact surface with respect to the fibrous web 1, but also a hardness of about 50 P & J. This ensures a sufficient load capacity. The roughness Rz of the transfer belt 6 should be between 5 and 50 micrometers.

Das Entwässerungsband 8 des dritten Pressspaltes sollte nicht nur wasseraufnehmend und luftdurchlässig, sondern auch möglichst glatt sein. Dies unterstützt die Glättung der Faserstoffbahn 1 im dritten Pressspalt und verstärkt die Haftung der Faserstoffbahn 1 am Entwässerungsband 8.The dewatering belt 8 of the third press nip should not only be water-absorbent and air-permeable, but also as smooth as possible. This supports the smoothing of the fibrous web 1 in the third press nip and increases the adhesion of the fibrous web 1 to the dewatering belt 8.

Hierzu sollte das Entwässerungsband 8 Fasern mit höchstens 11 dtex oder eine Beschichtung mit Polymeren oder eine erhöhte Anzahl von Schmelzklebfasern auf der Kontaktseite zur Faserstoffbahn 1 aufweisen.For this purpose, the dewatering belt should have 8 fibers with at most 11 dtex or a coating with polymers or an increased number of hot melt adhesive fibers on the contact side to the fibrous web 1.

Um die Führung der Faserstoffbahn 1 am Entwässerungsband 8 nach dem dritten Pressspalt zu unterstützen, befindet sich im Zwickel des auslaufenden Pressspaltes eine Blaseinrichtung 20, welche insbesondere beim Überführen Blasluft zwischen die Glättwalze 15 und die Faserstoffbahn 1 richtet.In order to support the guidance of the fibrous web 1 on the dewatering belt 8 after the third press nip, there is a blowing device 20 in the gusset of the outgoing press nip, which directs blowing air in particular between the smoothing roll 15 and the fibrous web 1 when transferring.

Dies ist nötig, weil die Faserstoffbahn 1 eine relativ starke Haftung an der glatten Glättwalze 15 aufweist.This is necessary because the fibrous web 1 has a relatively strong adhesion to the smooth smoothing roll 15.

Diese Glättwalze 15 ist zur Gewährleistung einer ausreichenden Glätte mit einer Keramikbeschichtung versehen.This smoothing roll 15 is provided to ensure sufficient smoothness with a ceramic coating.

Die besaugte Presswalze 16 besitzt mehrere in Bahnlaufrichtung 19 hintereinander angeordnete Saugzonen 21,22,23,24.The evacuated press roll 16 has a plurality of suction zones 21, 22, 23, 24 arranged one behind the other in the web running direction 19.

Dabei befindet sich im und in Bahnlaufrichtung 19 darüber hinaus eine Hochvakuumzone 21 mit einem Unterdruck zwischen 30 und kPa. Dieser hohe Unterdruck unterstützt die Entwässerung und die Haftung der Faserstoffbahn 1 am Entwässerungsband 8.In addition, there is a high vacuum zone 21 in and in the web running direction 19 with a negative pressure between 30 and kPa. This high negative pressure supports the drainage and the adhesion of the fibrous web 1 to the dewatering belt 8.

Alle anderen Saugzonen 22,23,24 weisen einen Unterdruck von weniger als 30 kPa auf.All other suction zones 22, 23, 24 have a negative pressure of less than 30 kPa.

Während die in Bahnlaufrichtung 19 erste Übernahmezone 23 die Übergabe der Faserstoffbahn 1 vom Transferband 6 an das Entwässerungsband 8 unterstützt, soll die Haltzone 22 die Faserstoffbahn 1 lediglich sicher zum Pressspalt führen.While the first takeover zone 23 in the web running direction 19 assists the transfer of the fibrous web 1 from the transfer belt 6 to the dewatering belt 8, the holding zone 22 should only guide the fibrous web 1 safely to the press nip.

Nach der Hochvakuumzone 21 schließt sich eine Nachzone 24 an, die das nach der Wegführung des Entwässerungsbandes 8 von diesem abgeschleuderte Wasser ansaugen soll. Zur Aufnahme dieses abgeschleuderten Wassers befindet sich auch eine Wasserrrine 25 zwischen der besaugten Presswalze 16 und dem ablaufenden Entwässerungsband 8.After the high-vacuum zone 21, a post-zone 24 adjoins, which is intended to suck in the water thrown off this after the removal of the dewatering belt 8. To accommodate this thrown off water is also a Wasserrrine 25 between the evacuated pressure roller 16 and the draining drainage belt eighth

Um das Überführen der Faserstoffbahn 1 zu erleichtern, wird die Glättwalze 15 abgehoben und während dieser Zeit drehzahlgesteuert angetrieben. Dies erleichtert das nachfolgende Schließen des Pressspaltes mit der ebenfalls drehzahlgesteuert angetriebenen, besaugten Presswalze 16.In order to facilitate the transfer of the fibrous web 1, the smoothing roller 15 is lifted and driven speed controlled during this time. This facilitates the subsequent closing of the press nip with the likewise speed-driven, sucked press roller 16.

Im Normalbetrieb wird die Glättwalze 15 jedoch momentgesteuert angetrieben.In normal operation, however, the smoothing roller 15 is driven torque-controlled.

Um einen Gleichlauf zwischen der Leitwalze 14 des Übergabebandes 7 mit der besaugten Presswalze 16 zu ermöglichen, wird diese Leitwalze 14 drehzahlgesteuert angetrieben.In order to enable a synchronization between the guide roller 14 of the transfer belt 7 with the evacuated pressure roller 16, this guide roller 14 is driven speed controlled.

Diese Pressanordnung vermindert nicht nur die Zweiseitigkeit der Faserstoffbahn 1 sondern sie ermöglicht auch das Erreichen höherer Trockengehalte bei sehr hohen Maschinengeschwindigkeiten.This press arrangement not only reduces the two-sidedness of the fibrous web 1 but also enables higher dry contents to be achieved at very high machine speeds.

Claims (25)

  1. Press arrangement for dewatering a paper, board or another fibrous web (1) in a machine for producing and/or finishing the same, having at least three pressure nips, the fibrous web (1) being led through the first pressure nip together with a water-absorbing dewatering belt (3, 4) on both sides and through the second pressure nip with a water-absorbing dewatering belt (5) and an opposing, smooth transfer belt (6), the third pressure nip being formed by a press roll (16) around which a water-absorbing dewatering belt (8) wraps and a smoothing roll (15) coming into contact with the fibrous web (1), and the smoothing roll (15) being arranged on the side of the fibrous web (1) opposite to the transfer belt (6), characterized in that the press roll (16) is evacuated, and in that the smoothing roll (15) is driven and the evacuated press roll (16) is driven under rotational speed control.
  2. Press arrangement according to Claim 1, characterized in that the dewatering belt (5) of the second pressure nip picks up the fibrous web (1) from the dewatering belt (4) of the first pressure nip which is opposite with respect to the fibrous web (1).
  3. Press arrangement according to Claim 1 or 2, characterized in that after the second pressure nip, the fibrous web (1) is transferred from the transfer belt (6), preferably running underneath the fibrous web (1), to an air-permeable transfer belt (7).
  4. Press arrangement according to Claim 3, characterized in that the transfer belt (7) wraps around an evacuated guide roll (14) as it picks up the fibrous web (1).
  5. Press arrangement according to Claim 3 or 4, characterized in that the dewatering belt (8) of the third pressure nip picks up the fibrous web (1) from the transfer belt (7).
  6. Press arrangement according to Claim 5, characterized in that the dewatering belt (8) picks up the fibrous web (1) in the evacuated wrap region of the evacuated press roll (16).
  7. Press arrangement according to one of the preceding claims, characterized in that the fibrous web (1) is transferred from the dewatering belt (8) of the third pressure nip to an air-permeable belt (9) of a following machine unit, preferably of a drying group.
  8. Press arrangement according to one of the preceding claims, characterized in that the first pressure nip is of extended design.
  9. Press arrangement according to Claim 8, characterized in that the first pressure nip is formed by a shoe press roll (11), preferably arranged above the fibrous web (1), and a cylindrical mating roll (10).
  10. Press arrangement according to one of the preceding claims, characterized in that the second pressure nip is of extended design.
  11. Press arrangement according to Claim 10, characterized in that the second pressure nip is formed by a shoe press roll (13), preferably arranged above the fibrous web (1), and a cylindrical mating roll (12).
  12. Press arrangement according to one of the preceding claims, characterized in that the smoothing roll (15) has a coating, preferably of ceramic.
  13. Press arrangement according to one of the preceding claims, characterized in that the diameter of the smoothing roll (15) is less than or equal to the diameter of the evacuated press roll (16).
  14. Press arrangement according to one of the preceding claims, characterized in that the evacuated press roll (16) has a plurality of suction zones (21, 22, 23, 24), preferably located one after another in the web running direction.
  15. Press arrangement according to Claim 14, characterized in that, in the region of the pressure nip, the evacuated press roll (16) has a high vacuum zone (21), which preferably also extends beyond the said nip in the web running direction (19).
  16. Press arrangement according to Claim 15, characterized in that the vacuum in the high-vacuum zone (21) is between 10 and 60 kPa.
  17. Press arrangement according to Claim 15 or 16, characterized in that the vacuum in the suction region of the evacuated press roll (16) outside the high vacuum zone (21) is less than 30 kPa.
  18. Press arrangement according to one of Claims 15 to 17, characterized in that the suction region of the evacuated press roll (16) extends beyond the wrap region of the dewatering belt (8) in the web running direction (19).
  19. Press arrangement according to one of the preceding claims, characterized in that the transfer belt (6) has a hardness of a maximum of 80 P&J, preferably a maximum of 50 P&J.
  20. Press arrangement according to one of the preceding claims, characterized in that the transfer belt (6) has a roughness Rz of between 5 and 50 micrometres.
  21. Press arrangement according to one of Claims 3 to 20, characterized in that the transfer belt (7) is formed as a low-marking belt, preferably as a dryer fabric.
  22. Press arrangement according to one of Claims 4 to 21, characterized in that the guide roll (14) of the transfer belt (7) is preferably driven under rotational speed control.
  23. Press arrangement according to one of the preceding claims, characterized in that during normal operation the smoothing roll (15) is driven under torque control.
  24. Press arrangement according to one of the preceding claims, characterized in that the third pressure nip is opened during the transfer of the fibrous web (1) and the smoothing roll (15) is preferably driven under rotational speed control.
  25. Press arrangement according to one of the preceding claims, characterized in that in the opening pocket after the third pressure nip there is a blower device (20) which, in particular during the transfer, directs blown air between the smoothing roll (15) and the fibrous web (1).
EP06121946A 2005-10-20 2006-10-09 Pressing arrangement Not-in-force EP1777340B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005050282A DE102005050282A1 (en) 2005-10-20 2005-10-20 Press arrangement

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Publication Number Publication Date
EP1777340A1 EP1777340A1 (en) 2007-04-25
EP1777340B1 true EP1777340B1 (en) 2008-12-24

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EP06121946A Not-in-force EP1777340B1 (en) 2005-10-20 2006-10-09 Pressing arrangement

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EP (1) EP1777340B1 (en)
AT (1) ATE418644T1 (en)
DE (2) DE102005050282A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009029625A1 (en) * 2009-09-21 2011-03-24 Voith Patent Gmbh Machine for producing and / or treating a fibrous web

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE684680C (en) * 1935-06-21 1939-12-02 William Hulse Millspaugh Fourdrinier paper machine
US4483745A (en) * 1982-09-29 1984-11-20 Beloit Corporation Method and apparatus of sheet transfer using a nonporous smooth surfaced belt
US5298124A (en) * 1992-06-11 1994-03-29 Albany International Corp. Transfer belt in a press nip closed draw transfer
US5876565A (en) * 1994-10-06 1999-03-02 Valmet Corporation Press section with an equalizing nip for compensating for elongation of a paper web
SE514973C2 (en) * 1999-09-07 2001-05-21 Valmet Karlstad Ab Method and paper machine for making a liner
DE10137527A1 (en) * 2001-08-01 2003-02-13 Voith Paper Patent Gmbh Rotogravure paper manufacturing assembly has additional press slits
DE10159115A1 (en) * 2001-12-01 2003-06-18 Voith Paper Patent Gmbh press section
DE10226825A1 (en) * 2002-06-15 2003-12-24 Voith Paper Patent Gmbh Press arrangement
FI116400B (en) * 2002-11-19 2005-11-15 Metso Paper Inc Press section in a paper or cardboard machine

Also Published As

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DE102005050282A1 (en) 2007-06-14
EP1777340A1 (en) 2007-04-25
DE502006002421D1 (en) 2009-02-05
ATE418644T1 (en) 2009-01-15

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