EP1852551A1 - Dewatering device - Google Patents

Dewatering device Download PDF

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Publication number
EP1852551A1
EP1852551A1 EP07107298A EP07107298A EP1852551A1 EP 1852551 A1 EP1852551 A1 EP 1852551A1 EP 07107298 A EP07107298 A EP 07107298A EP 07107298 A EP07107298 A EP 07107298A EP 1852551 A1 EP1852551 A1 EP 1852551A1
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EP
European Patent Office
Prior art keywords
fibrous web
press
press roll
roll
belt
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Granted
Application number
EP07107298A
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German (de)
French (fr)
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EP1852551B1 (en
Inventor
Andreas Meschenmoser
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Voith Patent GmbH
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Voith Patent GmbH
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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
    • D21F3/0272—Wet presses in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process
    • 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
    • D21F3/0281—Wet presses in combination with a dryer roll
    • 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
    • D21F5/182—Drying webs by hot air through perforated cylinders

Definitions

  • the invention relates to a device for dewatering a paper, tissue or another fibrous web in a machine for producing and / or thinning same, in which the fibrous web at least on each side at least one air-permeable and endlessly circulating belt wraps around a cylindrical and rotating press roll.
  • the object of the invention is therefore to allow a gentle and effective drainage of the fibrous web as possible.
  • the press roll is designed as a blow roll, which preferably directs hot blast air in the wrap around the fibrous web.
  • the blowing air causes für für Stunsky the fibrous web in the wrap of the press roll in a very cost effective manner, especially since compressed air is available in such machines in sufficient quantity.
  • the application of hot blast air can further assist drying.
  • a pressing pressure can be exerted on the fibrous web via the contact pressure of the press belt lying outside the press roll due to the belt tension, which promotes dewatering.
  • the press belt in the wrap area of the press roll is associated with a water collecting device which absorbs the, driven by the blowing air through the press belt water.
  • the water collection device is designed as a suction device.
  • the vacuum of the suction device causes the suction of additional water from the belts and the fibrous web into the water collecting device.
  • At least the, on the, the pressing roller opposite side of the fibrous web extending bands should be formed as a water-permeable felts or sieves.
  • the bands should wrap around at least one guide roll in front of the press roll together with the fibrous web, which is arranged on the, the press roll opposite side of the fibrous web.
  • the effect of the belt tension during the wrapping improves with decreasing diameter of the guide roller. Therefore, the diameter of the guide roll should be less than 800 mm.
  • the steam blower box should be arranged opposite the guide roller.
  • the guide roll wrapped around by the bands should be designed as a suction guide roll.
  • the negative pressure sucks water from the belts and the fibrous web into the guide roller.
  • the press belt has a high belt tension, i. Tensile stress is exposed, it is usually advantageous if at least two bands are arranged on the, the press roll opposite side of the fibrous web, wherein the outer forms the press belt. This makes it possible to adapt the other band according to the needs of water permeability, roughness, water storage capacity, etc.
  • At least the press belt after the press roll should wrap around a driven guide roll. Because of the high tensile strength of the press belt, it is particularly suitable for initiating the required drive power.
  • the strip arranged between the fibrous web and the press roll has a structured surface in the area of contact with the fibrous web.
  • a simplification of the arrangement further results when the press roll is arranged above the fibrous web. Tearing of the press belt thus does not affect the rest of the arrangement.
  • the fibrous web 1 is guided in the form of a tissue web from an air-permeable guide belt 2 starting from a headbox 11 of the manufacturing machine through a dewatering device according to the invention to a large drying cylinder 12, especially a Yankee cylinder.
  • the drying takes place, so that the fibrous web 1 can subsequently be removed with the aid of a creping doctor and thereby be creped. Thereafter, the rolling up of the fibrous web 1 takes place.
  • the dewatering device has a cylindrical and rotating press roll 5 arranged above the fibrous web 1. This press roll 5 is separated from the fibrous web 1 together with the inner guide strip 2 and at least an outer lying and also permeable to air and water press band 4.
  • the press roll 5 is designed as a blow roll with a perforated roll shell and directs hot blast air during wrapping in the direction of the fibrous web 1. During this contiguous web 1 in the band 4 and driven by this in a relation to the press roll 5 arranged water collecting device 6.
  • the water collecting device 6 is sucked.
  • a perforated suction pipe 9 running transversely to the web running direction 14 and connected to a vacuum source in the water collecting device 6.
  • the press belt 4 pushes the fibrous web 1 during the wrapping of the press roll 5 due to the belt tension against the guide belt 2, which leads to the squeezing out of water from the fibrous web 1. Because of the high tensile stresses, the press belt 4 must have a correspondingly high strength. For this particular bands or sieves are suitable.
  • the guide belt 2 After the press roller 5, the guide belt 2, the fibrous web 1 alone to the drying cylinder 12 continues. There, the fibrous web 1 is pressed by a looped by the guide belt 2 press roller 13 to the drying cylinder 12. Because of the smooth surface of the drying cylinder 12, the fibrous web 1 then adhere to this, so that the guide belt 2 can be led away.
  • the surface of the guide belt 2 is structured, so that during contact with the fibrous web 1, in particular during the pressing of the fibrous web 1 to the press roller 5, a corresponding surface structure in the fibrous web 1 is formed.
  • the band 3 is usually designed as a felt or sieve in the interest of higher water absorbency.
  • the press belt 4 wraps around a guide roller 7 together with the belt 3, the fibrous web 1 and the guide belt 2 located here. During this looping, the fibrous web 1 is already pre-pressed.
  • the guide roller 7 Opposite the guide roller 7 is a steam blower box 8, the superheated steam is directed to the guide belt 2 and this belt 2 and the fibrous web 1 heats up.
  • both belts 3,4 can optionally be conditioned and returned to the guide roller 7.
  • the fibrous web 1 in the dewatering apparatus shown in FIG. 2 is guided around the press roll 5 only by the guide belt 2 and the press belt 4.
  • the reduced number of bands also leads to less effort.
  • the fibrous web 1 is guided around a guide roller 7 together with the press belt 4 and the outer guide belt 2 before the wrapping of the press roller 5.
  • This guide roller 7 is additionally carried out, however, sucked, so that a certain amount of water from the fibrous web 1 and / or the press belt 4 is already sucked by this negative pressure.
  • Guide roller 7 is the steam blower box 8 for heating the guide belt 2 and the fibrous web. 1
  • the fibrous web 1 continues to run together with the guide belt 2, so that the press belt 4 alone can wrap around a driven guide roll 10.
  • the press roll 13 forming a press nip with the drying cylinder 12 is vacuumed.
  • the guide roller 7 in front of the press roller 5 has a diameter of less than 800 mm, which increases the effect of the belt tension on the fibrous web 1.
  • the formation of the press roll 5 as a blow roll not only reduces the energy costs, it also reduces the risk of contamination in the perforation of the roll shell of the press roll. 5
  • the press belt 4 Since the press belt 4 is located below the fibrous web 1, the risk for the large drying cylinder 12 is reduced in the event of a tear of the belt 4 as a consequence of the high belt tensions.

Abstract

In apparatus for dewatering a fibrous sheet (1), in which the sheet, with air-permeable endless revolving belt(s) (2, 3, 4) on each side, is at least partially wrapped around a rotating, cylindrical pressing roller (5), the pressing roller is in the form of a blowing roller which directs an air blast against the sheet in the wrapped region.

Description

Die Erfindung betrifft eine Vorrichtung zur Entwässerung einer Papier-, Tissue- oder einer anderen Faserstoffbahn in einer Maschine zur Herstellung und/oder Verdedlung derselben, bei der die Faserstoffbahn mit beidseitig zumindest je einem luftdurchlässigen und endlos umlaufenden Band eine zylindrische und rotierende Presswalze teilweise umschlingt.The invention relates to a device for dewatering a paper, tissue or another fibrous web in a machine for producing and / or thinning same, in which the fibrous web at least on each side at least one air-permeable and endlessly circulating belt wraps around a cylindrical and rotating press roll.

Derartige Pressanordnungen sind seit längerem bekannt, jedoch kann dabei die Entwässerungsleistung noch nicht befriedigen. Zwar kann diese durch ein Besaugen der Faserstoffbahn im Pressbereich verbessert werden, allerdings ist dies auch relativ energieintensiv.Such press arrangements have been known for a long time, but can not yet satisfy the drainage performance. Although this can be improved by a suction of the fibrous web in the pressing area, but this is also relatively energy-intensive.

Die Aufgabe der Erfindung ist es daher eine schonende und möglichst effektive Entwässerung der Faserstoffbahn zu ermöglichen.The object of the invention is therefore to allow a gentle and effective drainage of the fibrous web as possible.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass die Presswalze als Blaswalze ausgebildet ist, welche vorzugsweise heiße Blasluft im Umschlingungsbereich zur Faserstoffbahn richtet.According to the invention, this object is achieved in that the press roll is designed as a blow roll, which preferably directs hot blast air in the wrap around the fibrous web.

Die Blasluft bewirkt eine Durchlufttrocknung der Faserstoffbahn im Umschlingungsbereich der Presswalze auf sehr kostengünstige Weise, zumal Druckluft bei der derartigen Maschinen in ausreichender Menge zur Verfügung steht.The blowing air causes Durchlufttrocknung the fibrous web in the wrap of the press roll in a very cost effective manner, especially since compressed air is available in such machines in sufficient quantity.

Die Beaufschlagung mit heißer Blasluft kann die Trocknung noch weiter unterstützen.The application of hot blast air can further assist drying.

Während der Umschlingung kann über die Anpressung des bezüglich der Presswalze außen liegenden Press-Bandes infolge der Bandspannung außerdem ein Pressdruck auf die Faserstoffbahn ausgeübt werden, was die Entwässerung unterstützt.During the looping, a pressing pressure can be exerted on the fibrous web via the contact pressure of the press belt lying outside the press roll due to the belt tension, which promotes dewatering.

Dabei ist es vorteilhaft, wenn dem Press-Band im Umschlingungsbereich der Presswalze eine Wasserauffangvorrichtung zugeordnet ist, welche das, von der Blasluft durch das Press-Band getriebene Wasser auffängt.It is advantageous if the press belt in the wrap area of the press roll is associated with a water collecting device which absorbs the, driven by the blowing air through the press belt water.

Um dabei die Durchlufttrocknung noch zu unterstützen, ist es von Vorteil, wenn die Wasserauffangvorrichtung als Saugvorrichtung ausgeführt ist. Der Unterdruck der Saugvorrichtung bewirkt das Ansaugen von zusätzlichem Wasser aus den Bändern und der Faserstoffbahn in die Wasserauffangvorrichtung.In order to support the Durchlufttrocknung yet, it is advantageous if the water collection device is designed as a suction device. The vacuum of the suction device causes the suction of additional water from the belts and the fibrous web into the water collecting device.

Zur Gewährleistung der Wasserdurchlässigkeit und bei Bedarf auch einer bestimmten Wasseraufnahmefähigkeit sollten zumindest die, auf der, der Presswalze gegenüberliegenden Seite der Faserstoffbahn verlaufenden Bänder als wasserdurchlässige Filze oder Siebe ausgebildet sein.To ensure the water permeability and, if necessary, a certain water absorbency, at least the, on the, the pressing roller opposite side of the fibrous web extending bands should be formed as a water-permeable felts or sieves.

Zur Realisierung einer, wenn auch geringen Vorpressung sollten die Bänder vor der Presswalze gemeinsam mit der Faserstoffbahn zumindest eine Leitwalze umschlingen, welche auf der, der Presswalze gegenüberliegenden Seite der Faserstoffbahn angeordnet ist. Die Wirkung der Bandspannung während der Umschlingung verbessert sich mit kleiner werdendem Durchmesser der Leitwalze. Daher sollte der Durchmesser der Leitwalze kleiner als 800 mm sein.To realize a, although small pre-pressing, the bands should wrap around at least one guide roll in front of the press roll together with the fibrous web, which is arranged on the, the press roll opposite side of the fibrous web. The effect of the belt tension during the wrapping improves with decreasing diameter of the guide roller. Therefore, the diameter of the guide roll should be less than 800 mm.

Es ist zur Intensivierung der Entwässerung außerdem von Vorteil, wenn in Bahnlaufrichtung vor der Presswalze ein Dampfblaskasten angeordnet ist, welcher das mit der Presswalze in Kontakt kommende Band mit Heißdampf beaufschlagt. Dies führt zur Aufheizung des Bandes und der Faserstoffbahn und fördert so die Entwässerung.It is also to intensify the drainage advantageous if a steam blower box is arranged in the web running direction in front of the press roll, which acts on the coming into contact with the press roll strip with superheated steam. This leads to the heating of the belt and the fibrous web and thus promotes drainage.

Dabei sollte der Dampfblaskasten gegenüber der Leitwalze angeordnet sein.In this case, the steam blower box should be arranged opposite the guide roller.

Um den Entwässerungseffekt während der Vorpressung noch zusteigern, sollte die von den Bänden gemeinsam umschlungene Leitwalze als Saugleitwalze ausgebildet sein. Der Unterdruck saugt dabei Wasser aus den Bändern und der Faserstoffbahn in die Leitwalze.In order to increase the dehydration effect during the pre-pressing, the guide roll wrapped around by the bands should be designed as a suction guide roll. The negative pressure sucks water from the belts and the fibrous web into the guide roller.

Da das Press-Band infolge seiner Pressfunktion einer hohen Bandspannung, d.h. Zugspannung ausgesetzt ist, ist es meist vorteilhaft, wenn auf der, der Presswalze gegenüberliegenden Seite der Faserstoffbahn zumindest zwei Bänder angeordnet sind, wobei das äußere das Press-Band bildet. Dies erlaubt es, das andere Band entsprechend an die Bedürfnisse hinsichtlich Wasserdurchlässigkeit, Rauhigkeit, Wasserspeichervermögen usw. anzupassen.Because the press belt has a high belt tension, i. Tensile stress is exposed, it is usually advantageous if at least two bands are arranged on the, the press roll opposite side of the fibrous web, wherein the outer forms the press belt. This makes it possible to adapt the other band according to the needs of water permeability, roughness, water storage capacity, etc.

Eine Vereinfachung hinsichtlich des Aufwandes, insbesondere bei der Bandführung ergibt sich jedoch, wenn auf der, der Presswalze gegenüberliegenden Seite der Faserstoffbahn nur ein Band angeordnet ist, welches auch das Press-Band bildet.A simplification in terms of effort, especially in the tape guide, however, results if only one band is arranged on the side of the fibrous web opposite the press roller, which also forms the press belt.

Unabhängig von der Anzahl der Bänder sollte zumindest das Press-Band nach der Presswalze, vorzugsweise nach der Wegführung der Faserstoffbahn, eine angetriebene Leitwalze umschlingen. Wegen der hohen Zugfestigkeit des Press-Bandes ist es zur Einleitung der erforderlichen Antriebsleistung besonders geeignet.Regardless of the number of bands, at least the press belt after the press roll, preferably after the removal of the fibrous web, should wrap around a driven guide roll. Because of the high tensile strength of the press belt, it is particularly suitable for initiating the required drive power.

Im Allgemeinen genügt es außerdem, wenn zwischen der Faserstoffbahn und der Presswalze nur ein Band angeordnet ist. Zur Vergleichmäßigung der Oberfläche des perforierten Walzenmantels der Presswalze kann es jedoch vorteilhaft sein, wenn zwischen der Presswalze und dem Band ein Siebstrumpf oder ein Sieb angeordnet ist.In general, it is sufficient if only one band is arranged between the fibrous web and the press roll. To even out the surface of the perforated roll shell of the press roll, however, it may be advantageous if a Siebstrumpf or a sieve is arranged between the press roll and the belt.

Besondere Vorteile bringt die mit dieser Vorrichtung realisierbare Durchlufttrocknung bei der Entwässerung einer Tissuebahn.Special advantages brings with this device feasible Durchlufttrocknung in the drainage of a tissue web.

Dabei ergeben sich ein minimierter Aufwand und eine sichere Bahnführung insbesondere dann, wenn das zwischen der Presswalze und der Faserstoffbahn angeordnete Band die Faserstoffbahn von einer vorgelagerten Einheit, insbesondere einem Stoffauflauf bis zu einer nachgeordneten Einheit, insbesondere einem Trockenzylinder führt.This results in a minimized effort and a secure web guide in particular when the arranged between the press roll and the fibrous web belt leads the fibrous web from an upstream unit, in particular a headbox up to a downstream unit, in particular a drying cylinder.

Um die Oberflächenstruktur der Tissuebahn beeinflussen zu können, ist es vorteilhaft, wenn das zwischen der Faserstoffbahn und der Presswalze angeordnete Band im Kontaktbereich mit der Faserstoffbahn eine strukturierte Oberfläche aufweist.In order to be able to influence the surface structure of the tissue web, it is advantageous if the strip arranged between the fibrous web and the press roll has a structured surface in the area of contact with the fibrous web.

Eine Vereinfachung der Anordnung ergibt sich des Weiteren, wenn die Presswalze über der Faserstoffbahn angeordnet ist. Eine Reißen des Press-Bandes beeinträchtigt so nicht den Rest der Anordnung.A simplification of the arrangement further results when the press roll is arranged above the fibrous web. Tearing of the press belt thus does not affect the rest of the arrangement.

Für den Prozess der Durchlufttrocknung ist insgesamt wesentlich, dass die Blasluft durch ein Band, insbesondere in Form eines strukturierten Siebes, die Faserstoffbahn und anschließend durch wengistens ein Band in Form eines Fillers oder Siebes geblasen wird.For the process of Durchlufttrocknung is overall essential that the blowing air is blown through a band, in particular in the form of a structured screen, the fibrous web and then by at least one band in the form of a filler or screen.

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

  • Figur 1: einen schematischen Querschnitt durch eine Entwässerungsvorrichtung und
  • Figur 2: eine andere Vorrichtung.
The invention will be explained in more detail below with reference to several exemplary embodiments. In the attached drawing shows:
  • Figure 1: a schematic cross section through a dewatering device and
  • Figure 2: another device.

In beiden Fällen wird die Faserstoffbahn 1 in Form einer Tissuebahn von einem luftdurchlässigen Führungs-Band 2 beginnend von einem Stoffauflauf 11 der Herstellungsmaschine durch eine erfindungsgemäße Entwässerungsvorrichtung zu einem großen Trockenzylinder 12, speziell einem Yankee-Zylinder geführt.In both cases, the fibrous web 1 is guided in the form of a tissue web from an air-permeable guide belt 2 starting from a headbox 11 of the manufacturing machine through a dewatering device according to the invention to a large drying cylinder 12, especially a Yankee cylinder.

Während der Umschlingung des Trockenzylinders 12 erfolgt die Trocknung, so dass die Faserstoffbahn 1 anschließend mit Hilfe eines Kreppschabers abgenommen und dabei gekreppt werden kann. Danach erfolgt die Aufrollung der Faserstoffbahn 1.During the wrapping of the drying cylinder 12, the drying takes place, so that the fibrous web 1 can subsequently be removed with the aid of a creping doctor and thereby be creped. Thereafter, the rolling up of the fibrous web 1 takes place.

Die Entwässerungsvorrichtung besitzt eine über der Faserstoffbahn 1 angeordnete, zylindrische und rotierende Presswalze 5. Diese Presswalze 5 wird von der Faserstoffbahn 1 gemeinsam mit dem innen liegenden Führungs-Band 2 sowie wenigstens einem außen liegenden und ebenfalls luft- und wasserdurchlässigen Press-Band 4 umschlungen.The dewatering device has a cylindrical and rotating press roll 5 arranged above the fibrous web 1. This press roll 5 is separated from the fibrous web 1 together with the inner guide strip 2 and at least an outer lying and also permeable to air and water press band 4.

Die Presswalze 5 ist als Blaswalze mit perforiertem Walzenmantel ausgebildet und richtet heiße Blasluft während der Umschlingung in Richtung der Faserstoffbahn 1. Während dieser Durchlufttrocknung wird Wasser aus der Faserstoffbahn 1 in das Band 4 und von diesem in eine gegenüber der Presswalze 5 angeordnete Wasserauffangvorrichtung 6 getrieben.The press roll 5 is designed as a blow roll with a perforated roll shell and directs hot blast air during wrapping in the direction of the fibrous web 1. During this Durchlufttrocknung water from the fibrous web 1 in the band 4 and driven by this in a relation to the press roll 5 arranged water collecting device 6.

Um diesen Luftstrom durch die Faserstoffbahn 1 und die Bänder 2,3,4 noch zu unterstützen, ist die Wasserauffangvorrichtung 6 besaugt. Hierzu befindet sich in der Wasserauffangvorrichtung 6 ein perforiertes, quer zur Bahnlaufrichtung 14 verlaufendes und mit einer Unterdruckquelle verbundenes Saugrohr 9.In order to support this air flow through the fibrous web 1 and the bands 2,3,4 still, the water collecting device 6 is sucked. For this purpose, there is a perforated suction pipe 9 running transversely to the web running direction 14 and connected to a vacuum source in the water collecting device 6.

Das Press-Band 4 drückt die Faserstoffbahn 1 während der Umschlingung der Presswalze 5 infolge der Bandspannung gegen das Führuns-Band 2, was zum Herauspressen von Wasser aus der Faserstoffbahn 1 führt. Wegen der hohen Zugspannungen muss das Press-Band 4 eine entsprechend hohe Festigkeit aufweisen. Hierfür sind insbesondere Bänder oder Siebe geeignet.The press belt 4 pushes the fibrous web 1 during the wrapping of the press roll 5 due to the belt tension against the guide belt 2, which leads to the squeezing out of water from the fibrous web 1. Because of the high tensile stresses, the press belt 4 must have a correspondingly high strength. For this particular bands or sieves are suitable.

Nach der Presswalze 5 führt das Führungs-Band 2 die Faserstoffbahn 1 allein bis zum Trockenzylinder 12 weiter. Dort wird die Faserstoffbahn 1 von einer vom Führungs-Band 2 umschlungenen Presswalze 13 an den Trockenzylinder 12 gedrückt. Wegen der glatten Oberfläche des Trockenzylinders 12 bleibt die Faserstoffbahn 1 anschließend an diesem haften, so dass das Führungs-Band 2 weggeführt werden kann.After the press roller 5, the guide belt 2, the fibrous web 1 alone to the drying cylinder 12 continues. There, the fibrous web 1 is pressed by a looped by the guide belt 2 press roller 13 to the drying cylinder 12. Because of the smooth surface of the drying cylinder 12, the fibrous web 1 then adhere to this, so that the guide belt 2 can be led away.

Die Oberfläche des Führungs-Bandes 2 ist strukturiert, so dass sich während des Kontakts mit der Faserstoffbahn 1, insbesondere bei der Anpressung der Faserstoffbahn 1 an die Presswalze 5 eine entsprechende Oberflächenstruktur bei der Faserstoffbahn 1 herausbildet.The surface of the guide belt 2 is structured, so that during contact with the fibrous web 1, in particular during the pressing of the fibrous web 1 to the press roller 5, a corresponding surface structure in the fibrous web 1 is formed.

Bei der in Figur 1 dargestellten Anordnung läuft zwischen dem Press-Band 4 und der Faserstoffbahn 1 noch ein weiteres luft- und wasserdurchlässiges Band 3 endlos um. Dies erlaubt es das Press-Band 4 und das Band 3 hinsichtlich seiner Eigenschaften, wie Rauhigkeit, Festigkeit, Durchlässigkeit usw. besser und unabhängig voneinander an die Anforderungen anpassen zu können. Daher ist das Band 3 im Interesse einer höheren Wasseraufnahmefähigkeit meist als Filz oder Sieb ausgebildet.In the arrangement shown in Figure 1 runs between the press belt 4 and the fibrous web 1 yet another air and water permeable belt 3 endlessly. This allows the press belt 4 and the belt 3 with respect to its properties, such as roughness, strength, permeability, etc. better and independently to adapt to the requirements. Therefore, the band 3 is usually designed as a felt or sieve in the interest of higher water absorbency.

Vor der Presswalze 5 umschlingt das Press-Band 4 gemeinsam mit dem Band 3, der Faserstoffbahn 1 und dem hier außen liegenden Führungs-Band 2 eine Leitwalze 7. Während dieser Umschlingung kommt es bereits zu einer Vorpressung der Faserstoffbahn 1.Before the press roll 5, the press belt 4 wraps around a guide roller 7 together with the belt 3, the fibrous web 1 and the guide belt 2 located here. During this looping, the fibrous web 1 is already pre-pressed.

Gegenüber der Leitwalze 7 befindet sich ein Dampfblaskasten 8, dessen Heißdampf auf das Führungs-Band 2 gerichtet ist und dieses Band 2 und die Faserstoffbahn 1 aufheizt.Opposite the guide roller 7 is a steam blower box 8, the superheated steam is directed to the guide belt 2 and this belt 2 and the fibrous web 1 heats up.

Nach der Umschlingung der Presswalze 5 und der Wegführung der Faserstoffbahn1 umschlingt das Press-Band 4 mit dem außen liegenden Band 3 eine angetriebene Leitwalze 10. Anschließend können beide Bänder 3,4 gegebenenfalls konditioniert und zur Leitwalze 7 zurückgeführt werden.After the looping of the press roll 5 and the routing of the fibrous web 1, the press belt 4 wraps around the outer belt 3 a driven guide roller 10. Subsequently, both belts 3,4 can optionally be conditioned and returned to the guide roller 7.

Im Unterschied hierzu wird die Faserstoffbahn 1 bei der in Figur 2 gezeigten Entwässerungsvorrichtung nur von dem Führungsband 2 und dem Press-Band 4 um die Presswalze 5 geführt. Die verminderte Anzahl an Bändern führt auch zu einem geringeren Aufwand.In contrast to this, the fibrous web 1 in the dewatering apparatus shown in FIG. 2 is guided around the press roll 5 only by the guide belt 2 and the press belt 4. The reduced number of bands also leads to less effort.

Jedoch wird auch hier die Faserstoffbahn 1 vor der Umschlingung der Presswalze 5 gemeinsam mit dem Pressband 4 und dem außen liegenden Führungs-Band 2 um eine Leitwalze 7 geführt. Diese Leitwalze 7 ist zusätzlich allerdings besaugt ausgeführt, so dass bereits von diesem Unterdruck eine bestimmte Wassermenge aus der Faserstoffbahn 1 und/oder dem Pressband 4 gesaugt wird. Gegenüber derHowever, here too, the fibrous web 1 is guided around a guide roller 7 together with the press belt 4 and the outer guide belt 2 before the wrapping of the press roller 5. This guide roller 7 is additionally carried out, however, sucked, so that a certain amount of water from the fibrous web 1 and / or the press belt 4 is already sucked by this negative pressure. Opposite the

Leitwalze 7 befindet sich der Dampfblaskasten 8 zur Aufheizung des Führungs-Bandes 2 und der Faserstoffbahn 1.Guide roller 7 is the steam blower box 8 for heating the guide belt 2 and the fibrous web. 1

Nach der Presswalze 5 läuft die Faserstoffbahn 1 gemeinsam mit dem Führungs-Band 2 weiter, so dass das Press-Band 4 allein eine angetriebene Leitwalze 10 umschlingen kann.After the press roll 5, the fibrous web 1 continues to run together with the guide belt 2, so that the press belt 4 alone can wrap around a driven guide roll 10.

Ebenso ist die mit dem Trockenzylinder 12 einen Pressspalt bildende Presswalze 13 besaugt.Likewise, the press roll 13 forming a press nip with the drying cylinder 12 is vacuumed.

Bei beiden Anordnungen hat die Leitwalze 7 vor der Presswalze 5 einen Durchmesser von weniger als 800 mm, was die Wirkung der Bandspannung auf die Faserstoffbahn 1 erhöht.In both arrangements, the guide roller 7 in front of the press roller 5 has a diameter of less than 800 mm, which increases the effect of the belt tension on the fibrous web 1.

Die Ausbildung der Presswalze 5 als Blaswalze vermindert nicht nur die Energiekosten, es senkt auch die Gefahr von Verschmutzungen in der Perforation des Walzenmantels der Presswalze 5.The formation of the press roll 5 as a blow roll not only reduces the energy costs, it also reduces the risk of contamination in the perforation of the roll shell of the press roll. 5

Da sich das Press-Band 4 unter der Faserstoffbahn 1 befindet, vermindert sich bei einem Riss des Bandes 4 infolge der hohen Bandspannungen auch die Gefahr für den großen Trockenzylinder 12.Since the press belt 4 is located below the fibrous web 1, the risk for the large drying cylinder 12 is reduced in the event of a tear of the belt 4 as a consequence of the high belt tensions.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
FaserstoffbahnFibrous web
2,3,42,3,4
Bänderbands
55
Presswalzepress roll
66
WasserauffangvorrichtungWater collecting device
77
Leitwalzeguide roll
88th
Dampfblaskastensteam blow
99
Saugrohrsuction tube
1010
Leitwalzeguide roll
1111
Stoffauflaufheadbox
1212
Trockenzylinderdrying cylinders
1313
Presswalzepress roll
1414
BahnlaufrichtungWeb direction

Claims (18)

Vorrichtung zur Entwässerung einer Papier-, Tissue- oder einer anderen Faserstoffbahn (1) in einer Maschine zur Herstellung und/oder Verdedlung derselben, bei der die Faserstoffbahn (1) mit beidseitig zumindest je einem luftdurchlässigen und endlos umlaufenden Band (2,3,4) eine zylindrische und rotierende Presswalze (5) teilweise umschlingt, dadurch gekennzeichnet, dass die Presswalze (5) als Blaswalze ausgebildet ist, welche Blasluft im Umschlingungsbereich zur Faserstoffbahn (1) richtet.Apparatus for dewatering a paper, tissue or another fibrous web (1) in a machine for producing and / or thinning same, in which the fibrous web (1) has at least one air-permeable and endlessly circulating band (2, 3, 4) on both sides ) wraps around a cylindrical and rotating press roll (5), characterized in that the press roll (5) is designed as a blow roll, which directs blown air in the wrap around the fibrous web (1). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Presswalze (5) heiße Blasluft zur Faserstoffbahn (1) richtet.Apparatus according to claim 1, characterized in that the press roll (5) directs hot blast air to the fibrous web (1). Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass dem, bezüglich der Presswalze (5) außen liegenden Press-Band (4) im Umschlingungsbereich der Presswalze (5) eine Wasserauffangvorrichtung (6) zugeordnet ist, welche das, durch das Press-Band (4) getriebene Wasser auffängt.Apparatus according to claim 1 or 2, characterized in that the, with respect to the press roll (5) outer press belt (4) in the wrap region of the press roll (5) is associated with a water collecting device (6), which, by the press belt (4) trapped water. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Wasserauffangvorrichtung (6) als Saugvorrichtung ausgeführt ist.Apparatus according to claim 3, characterized in that the water collecting device (6) is designed as a suction device. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zumindest die, auf der, der Presswalze (5) gegenüberliegenden Seite der Faserstoffbahn (1) verlaufenden Bänder (3,4) als wasserdurchlässige Filze oder Siebe o.ä. ausgebildet sind.Device according to one of the preceding claims, characterized in that at least the, on the, the pressing roller (5) opposite side of the fibrous web (1) extending bands (3,4) as water-permeable felts or sieves o.ä. are formed. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Bänder (2,3,4) vor der Presswalze (5) gemeinsam mit der Faserstoffbahn (1) zumindest eine Leitwalze (7) umschlingen, welche auf der, der Presswalze (5) gegenüberliegenden Seite der Faserstoffbahn (1) angeordnet ist.Device according to one of the preceding claims, characterized in that the bands (2,3,4) in front of the press roll (5) together with the Woven fibrous web (1) at least one guide roll (7) wrap around, which on the, the press roll (5) opposite side of the fibrous web (1) is arranged. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in Bahnlaufrichtung (14) vor der Presswalze (5) ein Dampfblaskasten (8) angeordnet ist, welcher das mit der Presswalze (5) in Kontakt kommende Band (2) mit Heißdampf beaufschlagt.Device according to one of the preceding claims, characterized in that in the web running direction (14) in front of the press roller (5) a steam blower box (8) is arranged, which acts on the with the press roller (5) coming into contact band (2) with superheated steam. Vorrichtung nach Anspruch 6 und 7, dadurch gekennzeichnet, dass der Dampfblaskasten (8) gegenüber der Leitwalze (7) angeordnet ist.Apparatus according to claim 6 and 7, characterized in that the steam blower box (8) relative to the guide roller (7) is arranged. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die von den Bändern (2,3,4) gemeinsam umschlungene Leitwalze (7) als Saugleitwalze ausgebildet ist.Device according to one of claims 6 to 8, characterized in that of the bands (2,3,4) together wrapped guide roller (7) is designed as Saugleitwalze. Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass der Durchmesser der Leitwalze (7) kleiner als 800 mm ist.Device according to one of claims 6 to 9, characterized in that the diameter of the guide roller (7) is smaller than 800 mm. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass auf der, der Presswalze (5) gegenüberliegenden Seite der Faserstoffbahn (1) zumindest zwei Bänder (3,4) angeordnet sind, wobei das äußere das Press-Band (4) bildet.Device according to one of the preceding claims, characterized in that on the, the press roll (5) opposite side of the fibrous web (1) at least two bands (3,4) are arranged, wherein the outer forms the press belt (4). Vorrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass auf der, der Presswalze (5) gegenüberliegenden Seite der Faserstoffbahn (1) nur ein Band (4) angeordnet ist.Device according to one of claims 1 to 10, characterized in that on the, the press roll (5) opposite side of the fibrous web (1) only one band (4) is arranged. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zumindest das Press-Band (4) nach der Presswalze (5) eine angetriebene Leitwalze (10) umschlingt.Device according to one of the preceding claims, characterized in that at least the press belt (4) after the press roll (5) wraps around a driven guide roll (10). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen der Faserstoffbahn (1) und der Presswalze (5) nur ein Band (2) angeordnet ist.Device according to one of the preceding claims, characterized in that between the fibrous web (1) and the press roller (5) only one band (2) is arranged. Anwendung der Vorrichtung nach einem der vorhergehenden Ansprüche zur Entwässerung einer Tissuebahn.Application of the device according to one of the preceding claims for dewatering a tissue web. Vorrichtung nach Anspruch 15, dadurch gekennzeichnet, dass das zwischen der Presswalze (5) und der Faserstoffbahn (1) angeordnete Band (2) die Faserstoffbahn (1) von einer vorgelagerten Einheit, insbesondere einem Stoffauflauf (11) bis zu einer nachgeordneten Einheit, insbesondere einem Trockenzylinder (12) führt.Apparatus according to claim 15, characterized in that between the press roll (5) and the fibrous web (1) arranged band (2) the fibrous web (1) from an upstream unit, in particular a headbox (11) to a downstream unit, in particular a drying cylinder (12) leads. Vorrichtung nach Anspruch 15 oder 16, dadurch gekennzeichnet, dass das zwischen der Faserstoffbahn (1) und der Presswalze (5) angeordnete Band (2) im Kontaktbereich mit der Faserstoffbahn (1) eine strukturierte Oberfläche aufweist.Apparatus according to claim 15 or 16, characterized in that between the fibrous web (1) and the press roll (5) arranged band (2) in the contact region with the fibrous web (1) has a textured surface. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Presswalze (5) über der Faserstoffbahn (1) angeordnet ist.Device according to one of the preceding claims, characterized in that the press roll (5) over the fibrous web (1) is arranged.
EP20070107298 2006-05-05 2007-05-02 Dewatering device Not-in-force EP1852551B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610021328 DE102006021328A1 (en) 2006-05-05 2006-05-05 dehydrator

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EP1852551B1 EP1852551B1 (en) 2014-03-19

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Cited By (5)

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WO2008077874A1 (en) * 2006-12-22 2008-07-03 Voith Patent Gmbh Method and apparatus for drying a fibrous material web
WO2008077869A1 (en) * 2006-12-22 2008-07-03 Voith Patent Gmbh Method and apparatus for drying a fibrous web
AT505760B1 (en) * 2008-01-09 2009-04-15 Andritz Ag Maschf DEVICE AND METHOD FOR TAPPING A MATERIAL RAIL
WO2015000690A1 (en) * 2013-07-04 2015-01-08 Voith Patent Gmbh Method and compact device for producing non-woven fabric
WO2016066375A1 (en) * 2014-10-29 2016-05-06 Voith Patent Gmbh Device for dewatering a fiber web

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US3771236A (en) * 1971-01-12 1973-11-13 R Candor Method and apparatus for treating sheet-like material with fluid
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WO1998021407A1 (en) * 1996-11-14 1998-05-22 The Procter & Gamble Company Method for making paper web having both bulk and smoothness
DE10303959A1 (en) * 2003-01-31 2004-09-02 Voith Paper Patent Gmbh The water displacement press to extract water from a wet web, of paper or cardboard, uses a gas blower roller from below to give a gas pressure combined with an upper mechanical pressure
US20050167062A1 (en) * 2004-01-30 2005-08-04 Jeffrey Herman Dewatering apparatus in a paper machine

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Publication number Priority date Publication date Assignee Title
US3303576A (en) * 1965-05-28 1967-02-14 Procter & Gamble Apparatus for drying porous paper
US3771236A (en) * 1971-01-12 1973-11-13 R Candor Method and apparatus for treating sheet-like material with fluid
FR2733522A1 (en) * 1995-04-28 1996-10-31 Kaysersberg Sa Paper-making with more consistent and even pre-drying action on web
WO1998021407A1 (en) * 1996-11-14 1998-05-22 The Procter & Gamble Company Method for making paper web having both bulk and smoothness
DE10303959A1 (en) * 2003-01-31 2004-09-02 Voith Paper Patent Gmbh The water displacement press to extract water from a wet web, of paper or cardboard, uses a gas blower roller from below to give a gas pressure combined with an upper mechanical pressure
US20050167062A1 (en) * 2004-01-30 2005-08-04 Jeffrey Herman Dewatering apparatus in a paper machine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008077874A1 (en) * 2006-12-22 2008-07-03 Voith Patent Gmbh Method and apparatus for drying a fibrous material web
WO2008077869A1 (en) * 2006-12-22 2008-07-03 Voith Patent Gmbh Method and apparatus for drying a fibrous web
US8402673B2 (en) 2006-12-22 2013-03-26 Voith Patent Gmbh Method for drying a fibrous web
US8435384B2 (en) 2006-12-22 2013-05-07 Voith Patent Gmbh Method and apparatus for drying a fibrous web
US8544184B2 (en) 2006-12-22 2013-10-01 Voith Patent Gmbh Method and apparatus for drying a fibrous web
AT505760B1 (en) * 2008-01-09 2009-04-15 Andritz Ag Maschf DEVICE AND METHOD FOR TAPPING A MATERIAL RAIL
WO2009086573A1 (en) * 2008-01-09 2009-07-16 Andritz Ag Device and method for draining a material web
WO2015000690A1 (en) * 2013-07-04 2015-01-08 Voith Patent Gmbh Method and compact device for producing non-woven fabric
WO2016066375A1 (en) * 2014-10-29 2016-05-06 Voith Patent Gmbh Device for dewatering a fiber web
CN107148500A (en) * 2014-10-29 2017-09-08 福伊特专利有限公司 The device being dehydrated for fiber material web

Also Published As

Publication number Publication date
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