WO2003002814A1 - Drying section - Google Patents

Drying section Download PDF

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Publication number
WO2003002814A1
WO2003002814A1 PCT/EP2002/007070 EP0207070W WO03002814A1 WO 2003002814 A1 WO2003002814 A1 WO 2003002814A1 EP 0207070 W EP0207070 W EP 0207070W WO 03002814 A1 WO03002814 A1 WO 03002814A1
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WO
WIPO (PCT)
Prior art keywords
fibrous web
drying
smoothing
press
section
Prior art date
Application number
PCT/EP2002/007070
Other languages
German (de)
French (fr)
Inventor
Thomas Augscheller
Original Assignee
Voith Paper Patent Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Paper Patent Gmbh filed Critical Voith Paper Patent Gmbh
Publication of WO2003002814A1 publication Critical patent/WO2003002814A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • the invention relates to a dryer section of a machine for producing and / or finishing a paper, cardboard, tissue or other fibrous web in which the fibrous web, supported by drying fabrics, is guided over at least a number of heated drying cylinders, the fibrous web being guided by one upstream press section for dewatering the fibrous web to the dryer section.
  • the fibrous web runs with one or both sides of a press felt through at least one press nip.
  • the result is a relatively high roughness on the side of the fibrous web that comes into contact with the press felt. This applies, albeit to a lesser extent, to the side of the fibrous web that is in contact with a transfer belt or a dryer fabric.
  • the fibrous web therefore often has too high a roughness and, if there is only one press felt in the last press nip, also a pronounced two-sidedness, that is to say different surface properties.
  • the fibrous web increasingly does not meet the requirements for smoothness and printability.
  • the object of the invention is therefore to reduce the two-sidedness and the roughness of the fibrous web with relatively simple means.
  • the object was achieved in that at least on one of the first 6 drying cylinders of the dryer section a smoothing gap is formed between the drying cylinder and a smoothing device, in particular a smoothing roller, through which only the fibrous web runs, the pressing forces in the smoothing gap between 5 and 80 KN / m lie.
  • Shoe press rollers or press belts for formation can also be used as smoothing devices extended smoothing gap are used. While the flexible roll jacket in shoe press rolls is pressed against the drying cylinder by a pressing unit with a concave pressing surface, this is done with the press belts via the belt tension.
  • the smoothing gap at the beginning of the dryer section reduces the two-sidedness and the roughness of the fibrous web in a very efficient manner due to the smooth surfaces of the drying cylinder and smoothing device, since the fibrous web is very moist and soft in this area.
  • press forces must be limited to avoid excessive surface compaction. In most cases, press forces between 10 and 30 KN / m are sufficient in the smoothing gap.
  • a smoothing gap at the beginning of the drying section is sufficient, which should be present on one of the first 2, preferably on the first drying cylinder because of the higher moisture content of the fibrous web.
  • a first dryer fabric should guide the fibrous web from the press section to the first dryer cylinder and be guided away from the dryer cylinder in front of the smoothing gap. This allows the formation of a first drying group with only 2, preferably only one drying cylinder, which is positive for the rapid train build-up because of the stretching of the fibrous web.
  • the expansion can namely be compensated for by a higher speed of the dryer fabric of the second dryer group following the smoothing gap.
  • the fibrous web In particular at high machine speeds, it is advantageous to avoid tearing or even tearing of the fibrous web if it runs continuously from the beginning of the press section to the smoothing nip supported by at least one belt in the form of a press felt, a transfer belt, a dryer fabric or the like.
  • the supported area can also be extended beyond the smoothing gap.
  • the smoothing gap reduces the roughness of the fibrous web on both sides. This applies in particular to high-speed press sections with one or two press nips and preferably one press felt in each press nip on each side of the fibrous web.
  • the smoothing nip can be used not only to reduce the roughness but also to reduce the roughness bilaterality.
  • the smoothing roller should have an elastic cover.
  • the smoothing roller can be deflection-controlled. This allows the thickness profile of the fibrous web to be influenced transversely to the direction of web travel, which can be desired, for example, in the case of coating base papers.
  • the fibrous web 1 passes through two press nips together with a press felt 5 on each side, of which only the last press nip is shown here.
  • the press nips are elongated and are each formed by a cylindrical press roll 11 and a shoe press roll 10 of a known type.
  • Such a press section has a high drainage capacity and is suitable for very high machine speeds due to the continuous support of the fibrous web 1 by at least one press felt 5.
  • the water-absorbing, endlessly circulating press felts 5 lead to an undesirably high roughness of the fibrous web 1 in the press nips.
  • the upper press felt 5 is removed from the fibrous web 1 led away and the fibrous web 1 then from the lower press felt 5 on
  • This dryer fabric 2 leads the fibrous web 1 to the first heated drying cylinder 3 of the dryer section. After the fibrous web 1 adheres to the first drying cylinder 3 to a sufficient extent, the dryer fabric 2 is guided away from the fibrous web 1. Subsequently, the fibrous web 1 passes through a smoothing gap formed by the first drying cylinder 3 and a driven smoothing roller 4. This smoothing gap increases the smoothness and reduces the two-sidedness of the fibrous web 1 due to the good formability of the still relatively moist fibrous web 1 at the beginning of the drying process in a simple and efficient manner. Pressing forces between 10 and 30 KN / m in the smoothing gap are sufficient for this.
  • the smoothing roller 4 has an elastic cover 6, which facilitates the adaptation to the surface of the drying cylinder 3 and protects the fibrous web 1 from overpressing.
  • the smoothing roller 4 can also be designed to be deflection-controlled. This enables the thickness profile of the fibrous web 1 to be influenced in zones transverse to the web running direction 12.
  • the fibrous web 1 is transferred from the first drying cylinder 3 to a subsequent dryer fabric 2 of a subsequent dryer group.
  • the fibrous web 1 is alternately guided over heated drying cylinders 3 and suction-guided guide rollers 8, with the drying cylinders 3 and the guide rollers 8 being arranged in a row.
  • the fibrous web 1 is supported by the corresponding dryer fabric 2, the dry fabric 2 also pressing the fibrous web 1 against the surface of the heated drying cylinders 3.
  • the guide rollers 8 are each assigned a suction box 9, which not only sucks the guide roller 8 in a known manner, but also guides the fibrous web 1 on the dryer fabric 2 in the region between the drying cylinder 3 and guide roller 8 supported.
  • the first dryer group of the dryer section is formed by only one dryer cylinder 3, which is advantageous for the expansion compensation of the fibrous web 1.

Abstract

The invention relates to a drying section of a machine for producing and/or processing a paper, card, tissue or another fibrous web(1), wherein the fibrous web (1) is supported by the drying sieve (2) and guided over at least one row of heated drying cylinders (3), whereby the fibrous web (1) reaches the drying section via a press section, used for draining the fibrous web, which is arranged upstream. In order to reduce the roughness of the dried fibrous web (1) a smoothing gap is provided between the drying cylinder (3) and a smooth roller (4) on at least one of the first six drying cylinders (3) of the drying section, said gap only allowing the fibrous web (1) to pass through. The pressure in the pressing gap is between 5 and 80 KN/m.

Description

Trockenpartiedrying section
Die Erfindung betrifft eine Trockenpartie einer Maschine zur Herstellung und/oder Veredelung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn in der die Faserstoffbahn, von Trockensieben gestützt, über zumindest eine Reihe von beheizten Trockenzylindern geführt wird, wobei die Faserstoffbahn von einer vorgelagerten Pressenpartie zur Entwässerung der Faserstoffbahn zur Trockenpartie ge- langt.The invention relates to a dryer section of a machine for producing and / or finishing a paper, cardboard, tissue or other fibrous web in which the fibrous web, supported by drying fabrics, is guided over at least a number of heated drying cylinders, the fibrous web being guided by one upstream press section for dewatering the fibrous web to the dryer section.
In der Pressenpartie läuft die Faserstoffbahn mit einem oder beidseitig je einem Pressfilz durch zumindest einen Pressspalt. Im Ergebnis kommt es zu einer relativ hohen Rauhigkeit der mit dem Pressfilz in Kontakt kommenden Seite der Faserstoff- bahn. Dies gilt, wenn auch in geringerem Ausmaß ebenso für die mit einem Transferband oder einem Trockensieb in Kontakt stehende Seite der Faserstoffbahn.In the press section, the fibrous web runs with one or both sides of a press felt through at least one press nip. The result is a relatively high roughness on the side of the fibrous web that comes into contact with the press felt. This applies, albeit to a lesser extent, to the side of the fibrous web that is in contact with a transfer belt or a dryer fabric.
Am Ende der Trockenpartie weist die Faserstoffbahn daher oft eine zu hohe Rauhigkeit und bei nur einem Pressfilz im letzten Pressspalt auch eine ausgeprägte Zweisei- tigkeit, das. heißt unterschiedliche Oberflächeneigenschaften auf. Außerdem entspricht die Faserstoffbahn in zunehmenden Maße nicht den Anforderungen an Glätte und Bedruckbarkeit.At the end of the dryer section, the fibrous web therefore often has too high a roughness and, if there is only one press felt in the last press nip, also a pronounced two-sidedness, that is to say different surface properties. In addition, the fibrous web increasingly does not meet the requirements for smoothness and printability.
Die Aufgabe der Erfindung ist es daher, mit relativ einfachen Mitteln die Zweiseitigkeit und die Rauhigkeit der Faserstoffbahn zu verringern.The object of the invention is therefore to reduce the two-sidedness and the roughness of the fibrous web with relatively simple means.
Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass wenigstens an einem der ersten 6 Trockenzylinder der Trockenpartie ein Glättspalt zwischen dem Trockenzylinder und einer Glättvorrichtung, insbesondere einer Glättwalze gebildet wird, durch den nur die Faserstoffbahn läuft, wobei die Presskräfte im Glättspalt zwischen 5 und 80 KN/m liegen.According to the invention the object was achieved in that at least on one of the first 6 drying cylinders of the dryer section a smoothing gap is formed between the drying cylinder and a smoothing device, in particular a smoothing roller, through which only the fibrous web runs, the pressing forces in the smoothing gap between 5 and 80 KN / m lie.
Als Glättvorrichtungen können auch Schuhpresswalzen oder Pressbänder zur Bildung verlängerter Glättspalte zur Anwendung kommen. Während der flexible Walzenmantel bei Schuhpresswalzen von einer Anpresseinheit mit konkaver Pressfläche gegen den Trockenzylinder gepreßt wird, erfolgt dies bei den Pressbändern über die Bandspannung.Shoe press rollers or press belts for formation can also be used as smoothing devices extended smoothing gap are used. While the flexible roll jacket in shoe press rolls is pressed against the drying cylinder by a pressing unit with a concave pressing surface, this is done with the press belts via the belt tension.
Der Glättspalt am Beginn der Trockenpartie verringert die Zweiseitigkeit und die Rauhigkeit der Faserstoffbahn bedingt durch die glatten Oberflächen von Trockenzylinder und Glättvorrichtung auf sehr effiziente Weise, da die Faserstoffbahn in diesem Bereich sehr feucht und weich ist.The smoothing gap at the beginning of the dryer section reduces the two-sidedness and the roughness of the fibrous web in a very efficient manner due to the smooth surfaces of the drying cylinder and smoothing device, since the fibrous web is very moist and soft in this area.
Die Presskräfte müssen jedoch zur Vermeidung einer zu starken Oberflächenverdichtung begrenzt werden. In den meisten Fällen genügen im Glättspalt Presskräfte zwischen 10 und 30 KN/m.However, the pressing forces must be limited to avoid excessive surface compaction. In most cases, press forces between 10 and 30 KN / m are sufficient in the smoothing gap.
Im allgemeinen reicht die Realisierung eines Glättspaltes am Beginn der Trockenpartie aus, wobei dieser wegen des höheren Feuchtegehaltes der Faserstoffbahn an einem der ersten 2, vorzugsweise am ersten Trockenzylinder vorhanden sein sollte. Dabei sollte ein erstes Trockensieb die Faserstoffbahn von der Pressenpartie zum ersten Trockenzylinder führen und vor dem Glättspalt vom Trockenzylinder wegge- führt werden. Dies erlaubt die Ausbildung einer ersten Trockengruppe mit nur 2, vorzugsweise nur einem Trockenzylinder, was wegen der Dehnung der Faserstoffbahn für den schnellen Zugaufbau positiv ist. Die Dehnung kann nämlich durch eine höhere Geschwindigkeit des dem Glättspalt folgenden Trockensiebes der zweiten Trockengruppe ausgeglichen werden.In general, the realization of a smoothing gap at the beginning of the drying section is sufficient, which should be present on one of the first 2, preferably on the first drying cylinder because of the higher moisture content of the fibrous web. A first dryer fabric should guide the fibrous web from the press section to the first dryer cylinder and be guided away from the dryer cylinder in front of the smoothing gap. This allows the formation of a first drying group with only 2, preferably only one drying cylinder, which is positive for the rapid train build-up because of the stretching of the fibrous web. The expansion can namely be compensated for by a higher speed of the dryer fabric of the second dryer group following the smoothing gap.
Insbesondere bei hohen Maschinengeschwindigkeiten ist es zur Vermeidung von Ein- oder gar Abrissen der Faserstoffbahn von Vorteil, wenn diese vom Beginn der Pressenpartie bis zum Glättspalt ständig von zumindest einem Band in Form eines Pressfilzes, eines Transferbandes, eines Trockensiebes oder ähnlichem gestützt verläuft. Der gestützte Bereich kann auch über den Glättspalt hinaus ausgedehnt sein.In particular at high machine speeds, it is advantageous to avoid tearing or even tearing of the fibrous web if it runs continuously from the beginning of the press section to the smoothing nip supported by at least one belt in the form of a press felt, a transfer belt, a dryer fabric or the like. The supported area can also be extended beyond the smoothing gap.
In Fällen, bei denen die Faserstoffbahn gemeinsam mit beidseitig je einem Band durch zumindest einen, insbesondere den letzten Pressspalt der Pressenpartie läuft, verringert der Glättspalt die Rauhigkeit der Faserstoffbahn auf beiden Seiten. Dies gilt insbesondere für Hochgeschwindigkeitspressenpartien mit einem oder zwei Pressspalten und vorzugsweise beidseitig der Faserstoffbahn je einem Pressfilz in jedem Pressspalt.In cases where the fibrous web runs together with a belt on both sides through at least one, in particular the last press nip of the press section, the smoothing gap reduces the roughness of the fibrous web on both sides. This applies in particular to high-speed press sections with one or two press nips and preferably one press felt in each press nip on each side of the fibrous web.
Falls die Faserstoffbahn insbesondere durch den letzten Pressspalt der Pressenpartie mit nur einem Pressfilz geführt wird, kann der Glättspalt nicht nur zur Verringerung der Rauhigkeit sondern auch zur Verringerung der Rauhigkeits-Zweiseitigkeit verwendet werden.If the fibrous web is passed through the last press nip of the press section with only one press felt, the smoothing nip can be used not only to reduce the roughness but also to reduce the roughness bilaterality.
Zur Schonung der Faserstoffbahn und zur Vermeidung von Schäden am Trockenzylinder sollte die Glättwalze einen elastischen Bezug besitzen.To protect the fibrous web and to avoid damage to the drying cylinder, the smoothing roller should have an elastic cover.
Außerdem kann es von Vorteil sein, die Glättwalze durchbiegungsgesteuert auszu- führen. Dies erlaubt die Beeinflussung des Dickenprofils der Faserstoffbahn quer zur Bahnlaufrichtung, was beispielsweise bei Streichrohpapieren gewünscht sein kann.In addition, it can be advantageous to design the smoothing roller to be deflection-controlled. This allows the thickness profile of the fibrous web to be influenced transversely to the direction of web travel, which can be desired, for example, in the case of coating base papers.
Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur einen schematischen Querschnitt durch das Ende einer Pressenpartie und die folgende Trockenpartie.The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing, the figure shows a schematic cross section through the end of a press section and the following dryer section.
In der Pressenpartie durchläuft die Faserstoffbahn 1 gemeinsam mit beidseitig je einem Pressfilz 5 zwei Pressspalte, von denen hier nur der letzte Pressspalt dargestellt ist. Die Pressspalte sind verlängert ausgeführt und werden jeweils von einer zylindri- sehen Presswalze 11 und einer Schuhpresswalze 10 bekannter Art gebildet. Eine derartige Pressenpartie weist eine große Entwässerungsleistung auf und ist wegen der durchgehenden Stützung der Faserstoffbahn 1 von zumindest einem Pressfilz 5 für sehr hohe Maschinengeschwindigkeiten geeignet.In the press section, the fibrous web 1 passes through two press nips together with a press felt 5 on each side, of which only the last press nip is shown here. The press nips are elongated and are each formed by a cylindrical press roll 11 and a shoe press roll 10 of a known type. Such a press section has a high drainage capacity and is suitable for very high machine speeds due to the continuous support of the fibrous web 1 by at least one press felt 5.
Die wasseraufnehmenden, endlos umlaufenden Pressfilze 5 führen jedoch in den Pressspalten zu einer unerwünscht hohen Rauhigkeit der Faserstoffbahn 1.However, the water-absorbing, endlessly circulating press felts 5 lead to an undesirably high roughness of the fibrous web 1 in the press nips.
Nach dem letzten Pressspalt wird der obere Pressfilz 5 von der Faserstoffbahn 1 weggeführt und die Faserstoffbahn 1 anschließend vom unteren Pressfilz 5 an einAfter the last press nip, the upper press felt 5 is removed from the fibrous web 1 led away and the fibrous web 1 then from the lower press felt 5 on
Trockensieb 2 der folgenden Trockenpartie übergeben. Diese Übergabe wird von einer, vom endlos umlaufenden Trockensieb 2 umschlungenen und besaugten Leitwalze 7 unterstützt. Dieses Trockensieb 2 führt die Faserstoffbahn 1 zum ersten beheiz- ten Trockenzylinder 3 der Trockenpartie. Nachdem die Faserstoffbahn 1 in ausreichenden Maß am ersten Trockenzylinder 3 haftet, wird das Trockensieb 2 von der Faserstoffbahn 1 weggeführt. Im Anschluss durchläuft die Faserstoffbahn 1 allein einen, vom ersten Trockenzylinder 3 und einer angetrieben Glättwalze 4 gebildeten Glättspalt. Dieser Glättspalt erhöht die Glätte und verringert die Zweiseitigkeit der Fa- serstoffbahn 1 wegen der guten Formbarkeit der noch relativ feuchten Faserstoffbahn 1 am Beginn des Trocknungsprozesses auf einfache und effiziente Weise. Hierzu genügen Presskräfte zwischen 10 und 30 KN/m im Glättspalt.Transfer dryer fabric 2 to the following dryer section. This transfer is supported by a guide roller 7, which is wrapped and sucked by the endlessly circulating dryer fabric 2. This dryer fabric 2 leads the fibrous web 1 to the first heated drying cylinder 3 of the dryer section. After the fibrous web 1 adheres to the first drying cylinder 3 to a sufficient extent, the dryer fabric 2 is guided away from the fibrous web 1. Subsequently, the fibrous web 1 passes through a smoothing gap formed by the first drying cylinder 3 and a driven smoothing roller 4. This smoothing gap increases the smoothness and reduces the two-sidedness of the fibrous web 1 due to the good formability of the still relatively moist fibrous web 1 at the beginning of the drying process in a simple and efficient manner. Pressing forces between 10 and 30 KN / m in the smoothing gap are sufficient for this.
Die Glättwalze 4 besitzt einen elastischen Bezug 6, was die Anpassung an die Ober- fläche des Trockenzylinders 3 erleichtert und die Faserstoffbahn 1 vor einer Überpressung schützt.The smoothing roller 4 has an elastic cover 6, which facilitates the adaptation to the surface of the drying cylinder 3 and protects the fibrous web 1 from overpressing.
Bei Bedarf kann die Glättwalze 4 auch durchbiegungsgesteuert ausgeführt sein. Dies ermöglicht eine Beeinflussung des Dickenprofils der Faserstoffbahn 1 in Zonen quer zur Bahnlaufrichtung 12.If required, the smoothing roller 4 can also be designed to be deflection-controlled. This enables the thickness profile of the fibrous web 1 to be influenced in zones transverse to the web running direction 12.
Nach dem Glättspalt wird die Faserstoffbahn 1 vom ersten Trockenzylinder 3 an ein folgendes Trockensieb 2 einer folgenden Trockengruppe übergeben. In den folgenden Trockengruppen wird die Faserstoffbahn 1 abwechselnd über beheizte Trocken- zylinder 3 und besaugte Leitwalzen 8 geführt, wobei die Tröckenzylinder 3 und die Leitwalzen 8 in je einer Reihe angeordnet sind. Innerhalb jeder Trockengruppe wird die Faserstoffbahn 1 vom entsprechenden Trockensieb 2 gestützt, wobei das Trok- kensieb 2 die Faserstoffbahn 1 auch gegen die Oberfläche der beheizten Trockenzylinder 3 drückt.After the smoothing gap, the fibrous web 1 is transferred from the first drying cylinder 3 to a subsequent dryer fabric 2 of a subsequent dryer group. In the following drying groups, the fibrous web 1 is alternately guided over heated drying cylinders 3 and suction-guided guide rollers 8, with the drying cylinders 3 and the guide rollers 8 being arranged in a row. Within each dryer group, the fibrous web 1 is supported by the corresponding dryer fabric 2, the dry fabric 2 also pressing the fibrous web 1 against the surface of the heated drying cylinders 3.
Den Leitwalzen 8 ist jeweils ein Saugkasten 9 zugeordnet, welcher auf bekannte Weise nicht nur die Leitwalze 8 besaugt, sondern auch die Führung der Faserstoffbahn 1 am Trockensieb 2 im Bereich zwischen Trockenzylinder 3 und Leitwalze 8 unterstützt.The guide rollers 8 are each assigned a suction box 9, which not only sucks the guide roller 8 in a known manner, but also guides the fibrous web 1 on the dryer fabric 2 in the region between the drying cylinder 3 and guide roller 8 supported.
Die erste Trockengruppe der Trockenpartie wird nur von einem Trockenzylinder 3 gebildet, was für den Dehnungsausgleich der Faserstoffbahn 1 von Vorteil ist. The first dryer group of the dryer section is formed by only one dryer cylinder 3, which is advantageous for the expansion compensation of the fibrous web 1.

Claims

Patentansprüche claims
1. Trockenpartie einer Maschine zur Herstellung und/oder Veredelung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn (1 ) in der die Faserstoffbahn (1 ), von Trockensieben (2) gestützt, über zumindest eine Reihe von beheizten Trockenzylindern (3) geführt wird, wobei die Faserstoffbahn (1 ) von einer vorgelagerten Pressenpartie zur Entwässerung der Faserstoffbahn (1) zur Trockenpartie gelangt, dadurch gekennzeichnet, dass wenigstens an einem der ersten 6 Trockenzylinder (3) der Trockenpartie ein Glättspalt zwischen dem Trockenzylinder (3) und einer Glättvorrichtung, insbesondere einer Glättwalze (4) gebildet wird, durch den nur die Faserstoffbahn (1) läuft, wobei die Presskräfte im Glättspalt zwischen 5 und 80 KN/m liegen.1. Drying section of a machine for producing and / or finishing a paper, cardboard, tissue or other fibrous web (1) in which the fibrous web (1), supported by drying fabrics (2), over at least a number of heated drying cylinders ( 3) is guided, the fibrous web (1) coming from an upstream press section for dewatering the fibrous web (1) to the drying section, characterized in that at least on one of the first 6 drying cylinders (3) of the drying section there is a smoothing gap between the drying cylinder (3) and a smoothing device, in particular a smoothing roller (4), through which only the fibrous web (1) runs, the pressing forces in the smoothing gap being between 5 and 80 KN / m.
2. Trockenpartie nach Anspruch 1 , dadurch gekennzeichnet, dass die Presskräfte im Glättspalt zwischen 10 und 30 KN/m liegen.2. Drying section according to claim 1, characterized in that the pressing forces in the smoothing gap are between 10 and 30 KN / m.
3. Trockenpartie nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Glättspalt nur an einem der ersten zwei Trockenzylinder (3), vorzugsweise am ersten Trockenzylinder (3) vorhanden ist.3. Drying section according to claim 1 or 2, characterized in that the smoothing gap is only present on one of the first two drying cylinders (3), preferably on the first drying cylinder (3).
4. Trockenpartie nach Anspruch 3, dadurch gekennzeichnet, dass ein erstes Trockensieb (2) die Faserstoffbahn (1) von der Pressenpartie zum ersten Trockenzylinder (3) führt und vor dem Glättspalt vom Trockenzylinder (3) weggeführt wird.4. Drying section according to claim 3, characterized in that a first dryer fabric (2) guides the fibrous web (1) from the press section to the first drying cylinder (3) and is guided away from the drying cylinder (3) before the smoothing gap.
5. Trockenpartie nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Faserstoffbahn (1 ) vom Beginn der Pressenpartie bis zum Glättspalt ständig von zumindest einem Band in Form eines Pressfilzes (5), eines Transferbandes, eines Trockensiebes (2) oder ähnlichem gestützt verläuft. 5. Drying section according to one of the preceding claims, characterized in that the fibrous web (1) from the beginning of the press section to the smoothing gap is continuously supported by at least one belt in the form of a press felt (5), a transfer belt, a dryer fabric (2) or the like ,
6. Trockenpartie nach Anspruch 5, dadurch gekennzeichnet, dass die Faserstoffbahn (1 ) gemeinsam mit beidseitig je einem Band durch zumindest einen Pressspalt der Pressenpartie läuft.6. Drying section according to claim 5, characterized in that the fibrous web (1) runs together with a belt on both sides through at least one press nip of the press section.
7. Trockenpartie nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Glättwalze (4) einen elastischen Bezug (6) besitzt.7. Drying section according to one of the preceding claims, characterized in that the smoothing roller (4) has an elastic cover (6).
8. Trockenpartie nach einem der vorhergehenden Ansprüche, dadurch gekenn- zeichnet, dass die Glättwalze (4) durchbiegungsgesteuert ausgeführt ist. 8. Drying section according to one of the preceding claims, characterized in that the smoothing roller (4) is designed to be controlled by deflection.
PCT/EP2002/007070 2001-06-28 2002-06-26 Drying section WO2003002814A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10131346.2 2001-06-28
DE2001131346 DE10131346A1 (en) 2001-06-28 2001-06-28 drying section

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP1775377A1 (en) * 2005-10-13 2007-04-18 Voith Patent GmbH Pressing arrangement

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DE10306247A1 (en) * 2003-02-14 2004-08-26 Voith Paper Patent Gmbh De-watering press for paper- or card web employs endless, water-impermeable, smooth belt transferring web from pressing nip to smoothing nip
DE102005009858A1 (en) * 2005-03-04 2006-09-07 Voith Paper Patent Gmbh paper machine
DE102009002984A1 (en) 2009-05-11 2010-11-18 Voith Patent Gmbh Method for treating i.e. drying, of fibrous material web e.g. paper web, involves operating continuous running smoothing band by forming smoothing gap at other side of web over sub area of looping area of conveyor with suction surface
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