EP1936028B1 - Paper machine - Google Patents

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Publication number
EP1936028B1
EP1936028B1 EP07118648A EP07118648A EP1936028B1 EP 1936028 B1 EP1936028 B1 EP 1936028B1 EP 07118648 A EP07118648 A EP 07118648A EP 07118648 A EP07118648 A EP 07118648A EP 1936028 B1 EP1936028 B1 EP 1936028B1
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EP
European Patent Office
Prior art keywords
section
fibrous web
drying
machine according
impingement
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP07118648A
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German (de)
French (fr)
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EP1936028A1 (en
Inventor
Martin-Lars Adalid Damerau
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1936028A1 publication Critical patent/EP1936028A1/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
    • 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
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air

Definitions

  • the invention relates to a machine for producing and / or finishing a paper-board, tissue or other fibrous web with a press section for dewatering and a subsequent dryer section for drying the fibrous web, wherein the first drying element of the dryer section is formed by an impingement section in which the fibrous web is subjected to hot air or steam, while the fibrous web is supported on a running under it dry belt.
  • Impingement sections with their hot air or steam application are becoming increasingly popular for intensifying drying.
  • the fibrous web is supported at least in the first impingement section on a lower dry belt.
  • the document WO97 / 13031 describes a method in which the fiber web is dehydrated in at least one press nip and then dried in at least one impingement drying group, wherein the fibrous web is guided on a straight or a curved path with a large radius of curvature.
  • the object of the invention is therefore to improve the web guide in such arrangements.
  • this object is achieved in that the fibrous web is transferred from an upper band of the last press nip of the press section to the dry belt of the following, first impingement section and the first impingement section approximately horizontally, wherein in the first impingement- section the top of Faserstoftbahen (1) is acted upon with hot air or Dampt.
  • the fibrous web between the press and dryer section is always guided by a band in the form of the upper band of the press section or the dry belt. Since the fibrous web is always supported in the press section by a belt or a roller, resulting in this area of the machine a very stable running even at high machine speeds. Nevertheless, this arrangement requires no further band, for example a transfer belt.
  • the web guide is further supported by the fact that the fibrous web rests on the dry belt and the first impingement section runs horizontally.
  • the drying belt of the first impingement section should preferably run slightly convexly curved during hot air or steam in the web running direction.
  • the drying performance of the machine can be significantly increased if the first impingement section is followed by at least one further impingement section, wherein the drying belt of this section should preferably be perpendicular during the hot air or steam application.
  • the vertical course of the impingement section allows a very space-saving arrangement.
  • both sides of the fibrous web should be exposed to hot air or steam in the impingement sections.
  • the basis weight and the dry content of the fibrous web it may be advantageous to take measures that are safe Ensure guidance of the fibrous web after the last press nip on the upper belt of the press section.
  • the adhesion of the fibrous web can be reinforced at the upper band, if this has a smooth surface at least in the contact region with the fibrous web.
  • the adhesion of the fibrous web to the upper band can be enhanced by suction means.
  • the last press nip of the press section is formed by two press rolls pressed against each other, the upper being sucked out.
  • the upper band after the last press nip is guided past a suction device arranged on the side opposite the fibrous web, which is preferably designed as a suction roll or suction box.
  • the fibrous web should be passed to the impingement sections for drying over heated drying cylinders.
  • the press section for dewatering the fibrous web 1 has at least one press nip formed by two press rolls 6, 7 pressed against one another, through which the fibrous web 1 runs together with at least one water-absorbing dewatering belt 5 in the form of a press felt.
  • the single or last press nip is made extended here, for which reason the lower press roll 7 is formed by a shoe press roll and the upper press roll 6 is cylindrical.
  • the shoe press roll has a flexible roll shell, which is pressed by a pressing element with concave pressing surface to the cylindrical press roll 6.
  • an upper belt 2 may be formed differently.
  • the band 2 has a smooth surface, which enhances the adhesion of the fibrous web 1 to this band 2, so that the fibrous web 1 can be guided after the extended press nip solely from this band 2 to the transfer to a drying belt 3 of the following drying section.
  • the takeover is supported by a, coiled by the air-permeable drying belt 3, sucked guide roller 9.
  • the fibrous web 1 is supported in the press section up to the first part of the dryer section of at least one belt 2,3 or a roller, results in a very safe web guide even at very high machine speeds reduced risk of a railway crash. In addition, no additional transfer belt o. ⁇ . Is needed.
  • the band 2 is impermeable or only slightly permeable.
  • the upper press roller 6 can be sucked to improve the web guide.
  • the negative pressure of this press roller 6 additionally supports the adhesion of the fibrous web 1 to the belt 2 immediately after the extended press nip.
  • the lower dewatering belt 5 can be led away immediately after the extended press nip of the fibrous web 1, which prevents the rewet from this dewatering belt 5 starting.
  • the air-permeable dry belt 3 of the dryer section leads the fibrous web 1 after being taken over by a first impingement section, in which the fibrous web 1 is subjected to hot air or steam for intensive drying by a blow box 11.
  • the fibrous web 1 is very stable on the approximately horizontally running under her dry belt 3.
  • the dry belt 3 wraps in the field of loading partially a plurality of guide rollers 10, wherein in the web running direction 14 a slightly convex to the fibrous web 1 curved barrel results.
  • the dry belt 3 passes the fibrous web 1 to a running under the fibrous web 1 drying belt 4 a subsequent impingement section.
  • the drying belt 4 supports the fibrous web 1 during the application of two blow boxes 11 here.
  • the drying belt 4 runs from a large, upper Saugleitwalze 12 perpendicular to a large, lower Saugleitwalze 12 and then again perpendicular to the upper Saugleitwalze 12 upwards.
  • the impingement of the fibrous web 1 takes place, in which case the dry belt 4 is guided over a plurality of guide rollers 10 and there is a curved path to the fibrous web 1.
  • the drying belt 4 leads the fibrous web 1 alternately over heated drying cylinders 13 and guide rollers of a following drying group.
  • the upper band 2 is permeable, so that the upper press roller 6 can also be sucked.
  • cylindrical press rollers 6 can be used.
  • the fibrous web 1 guided on both sides by the lower dewatering belt 5 and the upper belt 2, runs together to a suction device 8 in the form of a, drawn from the upper belt 2, evacuated guide roller.
  • the sandwich guide between both belts 2.5 stabilizes the web run considerably.

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Abstract

The papermaking or -treating machine has a press section and a drying section. The web (1) is treated with hot air or steam in the first part of the drying section while it is supported on a drying belt (3), The web passes from an upper belt (2) in the last press nip to the first part of the drying section where the belt moves horizontally.

Description

Die Erfindung betrifft eine Maschine zur Herstellung und/oder Veredlung einer Papier-Karton-, Tissue- oder einer anderen Faserstoffbahn mit einer Pressenpartie zur Entwässerung und einer folgenden Trockenpartie zur Trocknung der Faserstoffbahn, wobei das erste Trocknungselement der Trockenpartie von einem Impingement-Abschnitt gebildet wird, in dem die Faserstoffbahn mit Heißluft oder Dampf beaufschlagt wird, während sich die Faserstoffbahn auf einem unter ihr laufenden Trockenband abstützt.The invention relates to a machine for producing and / or finishing a paper-board, tissue or other fibrous web with a press section for dewatering and a subsequent dryer section for drying the fibrous web, wherein the first drying element of the dryer section is formed by an impingement section in which the fibrous web is subjected to hot air or steam, while the fibrous web is supported on a running under it dry belt.

Impingement-Abschnitte mit ihrer Heißluft- oder Dampfbeaufschlagung finden zur Intensivierung der Trocknung zunehmend Interesse. Um dabei die Führung der noch relativ feuchten Faserstoffbahn auch bei den heute üblichen, sehr hohen Maschinengeschwindigkeiten sicher zu gestalten, stützt sich die Faserstoffbahn zumindest im ersten Impingement-Abschnitt auf einem unteren Trockenband ab.Impingement sections with their hot air or steam application are becoming increasingly popular for intensifying drying. In order to make sure the leadership of the still relatively moist fibrous web even at today's very high machine speeds safely, the fibrous web is supported at least in the first impingement section on a lower dry belt.

Bahnführungsprobleme bleiben jedoch insbesondere auch zwischen der Pressen-und Trockenpartie bestehen.Web guiding problems, however, remain particularly between the press and dryer section.

Oft übernimmt ein Transferband die Faserstoffbahn vom unteren Pressfilz und übergibt diese dann an ein Trockenband, was jedoch relativ aufwendig ist.Often a transfer belt takes over the fibrous web from the lower press felt and then transfers it to a dry belt, which is relatively expensive.

Das Dokument WO97/13031 beschreibt ein Verfahren bei dem die Fäserstoffbahn in mindestens einem Pressnip entwässert wird und anschließend in mindestens einer Impingement-Trockengruppe getrocknet wird wobei die Faserstoffbahn auf einer geraden oder einer gekrümmten Strecke mit großem Krümmungsradius geführt wird.The document WO97 / 13031 describes a method in which the fiber web is dehydrated in at least one press nip and then dried in at least one impingement drying group, wherein the fibrous web is guided on a straight or a curved path with a large radius of curvature.

Die Aufgabe der Erfindung ist es daher die Bahnführung bei derartigen Anordnungen zu verbessern.The object of the invention is therefore to improve the web guide in such arrangements.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass die Faserstoffbahn von einem oberen Band des letzten Pressspaltes der Pressenpartie zum Trockenband des folgenden, ersten Impingement-Abschnittes übergeben wird und der erste Impingement-Abschnitt etwa waagerecht verläuf, wobei in dem ersten impingement- Abschnitt die Oberseite der Faserstoftbahen (1) mit Heiβluft oder Dampt beaufschlagt wird.According to the invention this object is achieved in that the fibrous web is transferred from an upper band of the last press nip of the press section to the dry belt of the following, first impingement section and the first impingement section approximately horizontally, wherein in the first impingement- section the top of Faserstoftbahen (1) is acted upon with hot air or Dampt.

Damit wird die Faserstoffbahn zwischen der Pressen- und Trockenpartie immer von einem Band in Form des oberen Bandes der Pressenpartie oder des Trockenbandes geführt. Da die Faserstoffbahn auch in der Pressenpartie immer von einem Band oder einer Walze gestützt verläuft, ergibt sich in diesem Bereich der Maschine ein sehr stabiler Lauf selbst bei hohen Maschinengeschwindigkeiten. Dennoch erfordert diese Anordnung kein weiteres Band, beispielsweise ein Transferband.Thus, the fibrous web between the press and dryer section is always guided by a band in the form of the upper band of the press section or the dry belt. Since the fibrous web is always supported in the press section by a belt or a roller, resulting in this area of the machine a very stable running even at high machine speeds. Nevertheless, this arrangement requires no further band, for example a transfer belt.

Unterstützt wird die Bahnführung noch dadurch, dass die Faserstoffbahn auf dem Trockenband aufliegt und der erste Impingement-Abschnitt waagerecht verläuft.The web guide is further supported by the fact that the fibrous web rests on the dry belt and the first impingement section runs horizontally.

Im Interesse einer guten Haftung der Faserstoffbahn an dem Trockenband sollte das Trockenband des ersten Impingement-Abschnittes während der Heißluft- oder Dampfbeaufschlagung in Bahnlaufrichtung bevorzugt leicht konvex gekrümmt verlaufen.In the interest of a good adhesion of the fibrous web to the drying belt, the drying belt of the first impingement section should preferably run slightly convexly curved during hot air or steam in the web running direction.

Dabei ist es zur Vereinfachung der Konstruktion von Vorteil, wenn das Trockenband des ersten Impingement-Abschnittes während der Heißluft- oder Dampfbeaufschlagung mehrere Leitwalzen teilweise umschlingt.It is to simplify the construction of advantage when the dry belt of the first impingement section during the hot air or steaming several guide rollers partially wraps around.

Außerdem kann die Trockenleistung der Maschine erheblich gesteigert werden, wenn dem ersten Impingement-Abschnitt zumindest ein weiterer Impingement-Abschnitt folgt, wobei das Trockenband dieses Abschnittes während der Heißluft- oder Dampfbeaufschlagung vorzugsweise senkrecht verlaufen sollte. Der senkrechte Verlauf des Impingement-Abschnittes erlaubt eine sehr platzsparende Anordnung.In addition, the drying performance of the machine can be significantly increased if the first impingement section is followed by at least one further impingement section, wherein the drying belt of this section should preferably be perpendicular during the hot air or steam application. The vertical course of the impingement section allows a very space-saving arrangement.

Zur Minimierung der Rollneigung sowie der Zweiseitigkeit der Faserstoffbahn sollten in den Impingement-Abschnitten beide Seiten der Faserstoffbahn mit Heißluft- oder Dampf beaufschlagt werden.To minimize the curl as well as the two-sidedness of the fibrous web, both sides of the fibrous web should be exposed to hot air or steam in the impingement sections.

In Abhängigkeit von der Art, dem Flächengewicht und dem Trockengehalt der Faserstoffbahn kann es vorteilhaft sein, Maßnahmen zu treffen, die eine sichere Führung der Faserstoffbahn nach dem letzten Pressspalt am oberen Band der Pressenpartie sicherstellen.Depending on the type, the basis weight and the dry content of the fibrous web, it may be advantageous to take measures that are safe Ensure guidance of the fibrous web after the last press nip on the upper belt of the press section.

Dabei kann die Haftung der Faserstoffbahn am oberen Band verstärkt werden, wenn dieses zumindest im Kontaktbereich mit der Faserstoffbahn eine glatte Oberfläche aufweist.In this case, the adhesion of the fibrous web can be reinforced at the upper band, if this has a smooth surface at least in the contact region with the fibrous web.

Glatte Oberflächen lassen sich insbesondere dann einfach herstellen, wenn das obere Band des letzten Pressspaltes impermeabel oder leicht permeabel ausgeführt ist.Smooth surfaces can be produced in particular simply if the upper band of the last press nip is made impermeable or slightly permeable.

Falls das obere Band des letzten Pressspaltes jedoch permeabel ist, so kann die Haftung der Faserstoffbahn am oberen Band durch Saugvorrichtungen verstärkt werden.However, if the upper band of the last nip is permeable, the adhesion of the fibrous web to the upper band can be enhanced by suction means.

Dabei kann es von Vorteil sein, wenn der letzte Pressspalt der Pressenpartie von zwei gegeneinander gedrückten Presswalzen gebildet wird, wobei die obere besaugt ist.It may be advantageous if the last press nip of the press section is formed by two press rolls pressed against each other, the upper being sucked out.

Alternativ oder ergänzend kann es ebenso vorteilhaft sein, wenn das obere Band nach dem letzten Pressspalt an einer auf der, der Faserstoffbahn gegenüberliegenden Seite angeordneten Saugvorrichtung vorbeigeführt wird, welche vorzugsweise als Saugwalze oder Saugkasten ausgeführt ist.Alternatively or additionally, it may also be advantageous if the upper band after the last press nip is guided past a suction device arranged on the side opposite the fibrous web, which is preferably designed as a suction roll or suction box.

Zur Begrenzung des Aufwandes für die Trockenpartie sollte die Faserstoffbahn nach den Impingement-Abschnitten zur Trocknung über beheizte Trockenzylinder geführt werden.To limit the cost of the dryer section, the fibrous web should be passed to the impingement sections for drying over heated drying cylinders.

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

Figur 1:
einen schematischen Querschnitt durch den Übergang zwischen Pressen- und Trockenpartie und
Figur 2:
eine andere Gestaltung dieses Maschinenteils.
The invention will be explained in more detail below with reference to several exemplary embodiments. In the attached drawing shows:
FIG. 1:
a schematic cross section through the transition between press and dryer section and
FIG. 2:
another design of this machine part.

In beiden Fällen besitzt die Pressenpartie zur Entwässerung der Faserstoffbahn 1 zumindest einen, von zwei gegeneinander gedrückten Presswalzen 6,7 gebildeten Pressspalt, durch den die Faserstoffbahn 1 gemeinsam mit wenigstens einem wasseraufnehmenden Entwässerungsband 5 in Form eines Pressfilzes läuft.In both cases, the press section for dewatering the fibrous web 1 has at least one press nip formed by two press rolls 6, 7 pressed against one another, through which the fibrous web 1 runs together with at least one water-absorbing dewatering belt 5 in the form of a press felt.

Der einzige oder letzte Pressspalt ist hier verlängert ausgeführt, weshalb die untere Presswalze 7 von einer Schuhpresswalze gebildet wird und die obere Presswalze 6 zylindrisch ist.The single or last press nip is made extended here, for which reason the lower press roll 7 is formed by a shoe press roll and the upper press roll 6 is cylindrical.

Die Schuhpresswalze besitzt einen flexiblen Walzenmantel, der von einem Anpresselement mit konkaver Pressfläche zur zylindrischen Presswalze 6 gedrückt wird.The shoe press roll has a flexible roll shell, which is pressed by a pressing element with concave pressing surface to the cylindrical press roll 6.

Während die untere Schuhpresswalze 7 von dem wasseraufnehmenden Entwässerungsband 5 umschlungen ist, kann ein oberes Band 2 unterschiedlich ausgebildet sein.While the lower shoe press roller 7 is looped around by the water-absorbing dewatering belt 5, an upper belt 2 may be formed differently.

Bei der Ausführung gemäß Figur 1 hat das Band 2 eine glatte Oberfläche, was die Haftung der Faserstoffbahn 1 an diesem Band 2 verstärkt, so dass die Faserstoffbahn 1 nach dem verlängerten Pressspalt allein von diesem Band 2 bis zur Übergabe an ein Trockenband 3 der folgenden Trockenpartie geführt werden kann. Die Übernahme wird dabei von einer, vom luftdurchlässigen Trockenband 3 umschlungenen, besaugten Leitwalze 9 unterstützt.In the execution according to FIG. 1 the band 2 has a smooth surface, which enhances the adhesion of the fibrous web 1 to this band 2, so that the fibrous web 1 can be guided after the extended press nip solely from this band 2 to the transfer to a drying belt 3 of the following drying section. The takeover is supported by a, coiled by the air-permeable drying belt 3, sucked guide roller 9.

Da die Faserstoffbahn 1 in der Pressenpartie bis in den ersten Teil der Trockenpartie von wenigstens einem Band 2,3 oder einer Walze gestützt wird, ergibt sich auch bei sehr hohen Maschinengeschwindigkeiten eine sehr sichere Bahnführung bei verminderter Gefahr eines Bahnabrisses. Außerdem wird auch kein zusätzliches Transferband o. ä. benötigt.Since the fibrous web 1 is supported in the press section up to the first part of the dryer section of at least one belt 2,3 or a roller, results in a very safe web guide even at very high machine speeds reduced risk of a railway crash. In addition, no additional transfer belt o. Ä. Is needed.

Hierbei ist das Band 2 impermeabel oder nur geringfügig permeabel.Here, the band 2 is impermeable or only slightly permeable.

Sollte das Band 2 jedoch permeabel sein, so kann zur Verbesserung der Bahnführung die obere Presswalze 6 besaugt werden. Der Unterdruck dieser Presswalze 6 unterstützt zusätzlich die Haftung der Faserstoffbahn 1 an dem Band 2 unmittelbar nach dem verlängerten Pressspalt.However, should the band 2 be permeable, the upper press roller 6 can be sucked to improve the web guide. The negative pressure of this press roller 6 additionally supports the adhesion of the fibrous web 1 to the belt 2 immediately after the extended press nip.

Durch die verbesserte Haftung der Faserstoffbahn 1 am oberen Band 2 kann das untere Entwässerungsband 5 nach dem verlängerte Pressspalt sofort von der Faserstoffbahn 1 weggeführt werden, was die Rückbefeuchtung von diesem Entwässerungsband 5 ausgehend verhindert.Due to the improved adhesion of the fibrous web 1 on the upper belt 2, the lower dewatering belt 5 can be led away immediately after the extended press nip of the fibrous web 1, which prevents the rewet from this dewatering belt 5 starting.

Das luftdurchlässige Trockenband 3 der Trockenpartie führt die Faserstoffbahn 1 nach der Übernahme durch einen ersten Impingement-Abschnitt, in dem die Faserstoffbahn 1 zur intensiven Trocknung von einem Blaskasten 11 mit Heißluft oder Dampf beaufschlagt wird.The air-permeable dry belt 3 of the dryer section leads the fibrous web 1 after being taken over by a first impingement section, in which the fibrous web 1 is subjected to hot air or steam for intensive drying by a blow box 11.

Während dieser Beaufschlagung liegt die Faserstoffbahn 1 sehr stabil auf dem unter ihr etwa waagerecht laufenden Trockenband 3. Das Trockenband 3 umschlingt im Bereich der Beaufschlagung teilweise mehrere Leitwalzen 10, wobei sich in Bahnlaufrichtung 14 ein leicht konvex zur Faserstoffbahn 1 gekrümmter Lauf ergibt.During this loading, the fibrous web 1 is very stable on the approximately horizontally running under her dry belt 3. The dry belt 3 wraps in the field of loading partially a plurality of guide rollers 10, wherein in the web running direction 14 a slightly convex to the fibrous web 1 curved barrel results.

Nach diesem waagerechten Impingement-Abschnitt übergibt das Trockenband 3 die Faserstoffbahn 1 an ein unter der Faserstoffbahn 1 verlaufendes Trockenband 4 eines folgenden Impingement-Abschnittes.After this horizontal impingement section, the dry belt 3 passes the fibrous web 1 to a running under the fibrous web 1 drying belt 4 a subsequent impingement section.

Während in dem ersten Impingement-Abschnitt die Oberseite der Faserstoffbahn 1 mit Heißluft oder Dampf beaufschlagt wird, ist es im zweiten die Unterseite der Faserstoffbahn 1. Dadurch ergibt sich eine intensive Trocknung bei minimierter Zweiseitigkeit der Faserstoffbahn 1 und damit auch geringer Rollneigung.While hot air or steam is applied to the upper side of the fibrous web 1 in the first impingement section, it is the underside of the fibrous web 1 in the second. This results in intensive drying with minimized two-sidedness of the fibrous web 1 and thus also less tendency to curl.

Auch im zweiten Impingement-Abschnitt stützt das Trockenband 4 die Faserstoffbahn 1 während der Beaufschlagung durch hier zwei Blaskästen 11 ab. Das Trockenband 4 läuft dabei von einer großen, oberen Saugleitwalze 12 senkrecht zu einer großen, unteren Saugleitwalze 12 und anschließend wieder senkrecht zur oberen Saugleitwalze 12 nach oben.Also in the second impingement section, the drying belt 4 supports the fibrous web 1 during the application of two blow boxes 11 here. The drying belt 4 runs from a large, upper Saugleitwalze 12 perpendicular to a large, lower Saugleitwalze 12 and then again perpendicular to the upper Saugleitwalze 12 upwards.

Zwischen den Saugleitwalzen 12 findet die Beaufschlagung der Faserstoffbahn 1 statt, wobei auch hier das Trockenband 4 über mehrere Leitwalzen 10 geführt wird und sich ein zur Faserstoffbahn 1 gekrümmter Verlauf ergibt.Between the Saugleitwalzen 12, the impingement of the fibrous web 1 takes place, in which case the dry belt 4 is guided over a plurality of guide rollers 10 and there is a curved path to the fibrous web 1.

Im Ergebnis kommt es bei dieser Gestaltung der Impingement-Abschnitte zu einer optimalen Raumausnutzung.As a result, it comes in this design of the impingement sections to an optimal use of space.

Nach diesem zweiten Impingement-Abschnitt führt das Trockenband 4 die Faserstoffbahn 1 abwechseln über beheizte Trockenzylinder 13 und Leitwalzen einer folgenden Trockengruppe.After this second impingement section, the drying belt 4 leads the fibrous web 1 alternately over heated drying cylinders 13 and guide rollers of a following drying group.

Bei der in Figur 2 gezeigten Ausführung ist das obere Band 2 permeabel, so das die obere Presswalze 6 auch besaugt werden kann. Es sind allerdings auch normale, zylindrische Presswalzen 6 einsetzbar.At the in FIG. 2 As shown embodiment, the upper band 2 is permeable, so that the upper press roller 6 can also be sucked. However, it is also normal, cylindrical press rollers 6 can be used.

Nach dem verlängerten Pressspalt läuft die Faserstoffbahn 1, beidseitig vom unteren Entwässerungsband 5 und dem oberen Band 2 geführt, gemeinsam bis zu einer Saugvorrichtung 8 in Form einer, vom oberen Band 2 umschlungenen, besaugten Leitwalze. Die Sandwichführung zwischen beiden Bändern 2,5 stabilisiert den Bahnlauf erheblich.After the extended press nip, the fibrous web 1, guided on both sides by the lower dewatering belt 5 and the upper belt 2, runs together to a suction device 8 in the form of a, drawn from the upper belt 2, evacuated guide roller. The sandwich guide between both belts 2.5 stabilizes the web run considerably.

Die Besaugung durch diese Leitwalze verstärkt die Haftung der Faserstoffbahn 1 am oberen Band 2, so dass hier das untere Entwässerungsband 5 von der Faserstoffbahn 1 weggeführt werden kann. Anschließend übergibt das obere Band 2 die Faserstoffbahn 1 an das Trockenband 3 des folgenden Impingement-Abschnittes.The suction through this guide roller increases the adhesion of the fibrous web 1 on the upper belt 2, so that here the lower dewatering belt 5 can be led away from the fibrous web 1. Subsequently, the upper band 2 passes the fibrous web 1 to the drying belt 3 of the following impingement section.

Während in Figur 1 die Übergabe der Faserstoffbahn 1 an das Trockenband 3 nach der Umschlingung einer Leitwalze des Bandes 2 erfolgt, geschieht dies bei der in Figur 2 dargestellten Anordnung bereits vor der Umschlingung der Leitwalze.While in FIG. 1 the transfer of the fibrous web 1 to the drying belt 3 after the wrapping of a guide roll of the belt 2, this is done in the in FIG. 2 already shown before the wrap of the guide roller.

Claims (11)

  1. Machine for producing and/or finishing a paper, board, tissue or other fibrous web (1), having a press section for dewatering and a following drying section for drying the fibrous web (1), the first drying element of the drying section being formed by an impingement section, in which the fibrous web (1) has hot air or steam applied to it while the fibrous web (1) is supported on a drying fabric (3) running under it,
    characterized in that
    the fibrous web (1) is transferred from an upper belt (2) of the last press nip of the press section to the drying fabric (3) of the following, first impingement section, and the first impingement section runs approximately horizontally, the upper side of the fibrous web (1) having hot air or steam applied to it in the first impingement section.
  2. Machine according to Claim 1,
    characterized in that
    the drying fabric (3) of the first impingement section runs in a slightly convexly curved manner in the web running direction (14) during the application of the hot air or steam.
  3. Machine according to Claim 1 or 2,
    characterized in that
    the drying fabric (3) of the first impingement section wraps partially around a plurality of guide rolls (10) during the application of the hot air or steam.
  4. Machine according to one of the preceding claims,
    characterized in that
    at least one further impingement section follows the first impingement section, the drying fabric (4) of this section preferably running vertically during the application of the hot air or steam.
  5. Machine according to Claim 4,
    characterized in that
    hot air or steam is applied to both sides of the fibrous web (1).
  6. Machine according to one of the preceding claims,
    characterized in that
    the upper belt (2) of the last press nip has a smooth surface, at least in the area of contact with the fibrous web (1).
  7. Machine according to one of the preceding claims,
    characterized in that
    the upper belt (2) of the last press nip is designed to be impermeable or slightly permeable.
  8. Machine according to one of Claims 1 to 6,
    characterized in that
    the upper belt (2) of the last press nip is designed to be permeable.
  9. Machine according to Claim 8,
    characterized in that
    the last press nip of the press section is formed by two press rolls (6, 7) pressed against each other, the upper being evacuated.
  10. Machine according to Claim 8 or 9,
    characterized in that
    the upper belt (2) after the last press nip is led past a suction apparatus (8) which is arranged on the side opposite the fibrous web (1) and which is preferably designed as a suction roll or suction box.
  11. Machine according to one of the preceding claims,
    characterized in that
    after the impingement sections, the fibrous web (1) is led over heated drying cylinders (13) to be dried.
EP07118648A 2006-12-22 2007-10-17 Paper machine Not-in-force EP1936028B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006061106A DE102006061106A1 (en) 2006-12-22 2006-12-22 paper machine

Publications (2)

Publication Number Publication Date
EP1936028A1 EP1936028A1 (en) 2008-06-25
EP1936028B1 true EP1936028B1 (en) 2011-12-14

Family

ID=39203221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07118648A Not-in-force EP1936028B1 (en) 2006-12-22 2007-10-17 Paper machine

Country Status (3)

Country Link
EP (1) EP1936028B1 (en)
AT (1) ATE537296T1 (en)
DE (1) DE102006061106A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI102623B1 (en) * 1995-10-04 1999-01-15 Valmet Corp Procedure and apparatus in a paper machine
FI124698B (en) * 2004-01-15 2014-12-15 Valmet Technologies Inc Arrangement in a paper machine

Also Published As

Publication number Publication date
ATE537296T1 (en) 2011-12-15
EP1936028A1 (en) 2008-06-25
DE102006061106A1 (en) 2008-06-26

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