EP1852551B1 - Dewatering device - Google Patents

Dewatering device Download PDF

Info

Publication number
EP1852551B1
EP1852551B1 EP20070107298 EP07107298A EP1852551B1 EP 1852551 B1 EP1852551 B1 EP 1852551B1 EP 20070107298 EP20070107298 EP 20070107298 EP 07107298 A EP07107298 A EP 07107298A EP 1852551 B1 EP1852551 B1 EP 1852551B1
Authority
EP
European Patent Office
Prior art keywords
tissue web
belt
press
roll
press roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP20070107298
Other languages
German (de)
French (fr)
Other versions
EP1852551A1 (en
Inventor
Andreas Meschenmoser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith 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 Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1852551A1 publication Critical patent/EP1852551A1/en
Application granted granted Critical
Publication of EP1852551B1 publication Critical patent/EP1852551B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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 tissue web according to the preamble of claim 1, as well as a machine with this device.
  • 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 tissue web in the pressing area, but this is also relatively energy-intensive.
  • a device for producing a tissue web is described.
  • the pulp is applied by means of a headbox on a dewatering screen and dewatered there and formed a tissue web.
  • After the transfer of the web to a transport screen this is dried by two consecutively arranged through-air dryer, wherein the direction of the air flow is different.
  • the tissue web is then transferred to a drying cylinder for further drying and creping.
  • the document US3,771,236 discloses a through-flow drying device, and a method for drying sheet-like material webs.
  • the web is guided between a belt and a carrier tape through a pressure field, which causes an air flow through the belt, the web and the carrier tape.
  • the tape consists of a felt or fabric having a perforated layer. This layer causes a uniform flow through the material web with air even with locally different water content of the web.
  • the document DE10303959 A1 shows a positive displacement dewatering press for dewatering a fibrous web by displacing water by means of gas and mechanical pressure. It comprises a gas pressure-generating blow roll, a guided together with the fibrous web around the blow roll, lying between the fibrous web and the blow roll gas-permeable inner carrier tape and at least one guided around the blow roll, lying on the side remote from the blow roll and the carrier tape side of the fibrous web, the mechanical pressure generating, in particular high-strength outer screen.
  • the object of the invention is therefore to allow a gentle and effective drainage of the fibrous web as possible.
  • this object is achieved in that in the Umschl Trents Symposium on the, the press roll opposite side of the tissue web two bands are arranged, wherein the outer band forms a water-permeable press belt and arranged between the tissue web and the press belt, in contact with the Tissuebahn upcoming band is designed as wasserduchiner felt.
  • the blowing air causes a für für Stunsky the tissue 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 tissue 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 tissue web into the water collecting device.
  • the pressing band can be designed as a stem.
  • the bands in front of the press roll together with the tissue web should at least wrap around a guide roll which is arranged on the side of the tissue web opposite the press roll.
  • 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.
  • At least the press belt should after the press roll, preferably after the removal of the tissue web, 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 band arranged between the tissue web and the press roll has a structured surface in the area of contact with the tissue web.
  • a simplification of the arrangement further results when the press roll is arranged above the tissue web. Tearing of the press belt thus does not affect the rest of the arrangement.
  • the tissue web 1 is guided by an air-permeable guide belt 2 starting from a headbox 11 of the production 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 tissue web 1 can subsequently be removed with the aid of a creping doctor and thereby creped. Thereafter, the reeling of the tissue web 1.
  • the dewatering device has a cylindrical and rotating pressure roller 5 arranged above the tissue web 1. This pressure roller 5 is looped around by the tissue web 1 together with the inner guide belt 2 and at least one outer and also air-permeable press belt 4.
  • the press roll 5 is designed as a blower roll with a perforated roll shell and directs hot blast air during wrapping in the direction of the tissue web 1. During this contiguous water is driven from the tissue web 1 in the band 4 and from 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 presses the tissue web 1 during the wrapping of the press roll 5 due to the belt tension against the guide belt 2, which leads to squeezing out of water from the tissue 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 continues the tissue web 1 alone up to the drying cylinder 12. There, the tissue web 1 is pressed against the drying cylinder 12 by a press roller 13 looped around by the guide belt 2. Because of the smooth surface of the drying cylinder 12, the fiber web 1 then adhere to this, so that the guide belt 2 can be wegge-leads.
  • the surface of the guide belt 2 is structured, so that during contact with the tissue web 1, in particular when the tissue web 1 is pressed against the press roller 5, a corresponding surface structure is formed in the tissue web 1.
  • the band 3 is formed in the interest of a higher water absorbency as felt.
  • the press belt 4 wraps together with the belt 3, the tissue web 1 and the guide belt 2 located here outside a guide roller 7. During this wrapping, there is already a pre-pressing of the tissue web.
  • the hot steam is directed to the guide belt 2 and this belt 2 and the tissue web 1 heats up.
  • both belts 3,4 can optionally be conditioned and returned to the guide roll 7.
  • 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 tissue 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 tissue web 1, the risk for the large drying cylinder 12 is reduced in the event of a tear of the belt 4 due to the high belt tensions.

Landscapes

  • Paper (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Entwässerung einer Tissuebahn nach dem Oberbegriff des Anspruches 1, sowie einer Maschine mit dieser Vorrichtung.The invention relates to a device for dewatering a tissue web according to the preamble of claim 1, as well as a machine with this device.

Derartige Pressanordnungen sind seit längerem bekannt, jedoch kann dabei die Entwässerungsleistung noch nicht befriedigen. Zwar kann diese durch ein Besaugen der Tissuebahn 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 tissue web in the pressing area, but this is also relatively energy-intensive.

Im Dokument FR-A1-2733522 ist eine Vorrichtung zur Herstellung einer Tissuebahn beschrieben. Der Faserstoff wird mittels eines Stoffauflaufes auf ein Entwässerungssieb aufgebracht und dort entwässert und eine Tissuebahn gebildet. Nach der Übergabe der Bahn auf ein Transportsieb wird diese durch zwei hintereinander angeordnete Durchlufttrockner getrocknet, wobei die Richtung der Durchströmluft unterschiedlich ist. Anschließend wird die Tissuebahn an einen Trockenzylinder zur weiteren Trocknung und Kreppung übergeben.In the document FR-A1-2733522 a device for producing a tissue web is described. The pulp is applied by means of a headbox on a dewatering screen and dewatered there and formed a tissue web. After the transfer of the web to a transport screen this is dried by two consecutively arranged through-air dryer, wherein the direction of the air flow is different. The tissue web is then transferred to a drying cylinder for further drying and creping.

Das Dokument US3,771,236 offenbart eine Durchströmtrocknungseinrichtung, sowie ein Verfahren zum Trocknen von flächige Materialbahnen. Die Materialbahn wird dabei zwischen einem Band und einem Trägerband durch ein Druckfeld geführt, das einen Luftstrom durch das Band, die Materialbahn und das Trägerband hervorruft. Das Band besteht aus einem Filz oder einer Bespannung, der bzw. die eine gelochte Schicht aufweist. Diese Schicht bewirkt eine gleichmäßige Durchströmung der Materialbahn mit Luft auch bei lokal unterschiedlichem Wassergehalt der Bahn.The document US3,771,236 discloses a through-flow drying device, and a method for drying sheet-like material webs. The web is guided between a belt and a carrier tape through a pressure field, which causes an air flow through the belt, the web and the carrier tape. The tape consists of a felt or fabric having a perforated layer. This layer causes a uniform flow through the material web with air even with locally different water content of the web.

Das Dokument DE10303959 A1 zeigt eine Verdrängungsentwässerungspresse zur Entwässerung einer Faserstoffbahn durch Verdrängen von Wasser mittels gas- und mechanischem Druck. Sie umfasst eine den Gasdruck erzeugende Blaswalze, ein zusammen mit der Faserstoffbahn um die Blaswalze geführtes, zwischen der Faserstoffbahn und der Blaswalze liegendes gasdurchlässiges inneres Trägerband und wenigstens ein um die Blaswalze geführtes, auf der von der Blaswalze und dem Trägerband abgewandten Seite der Faserstoffbahn liegenden, den mechanischen Druck erzeugendes, insbesondere hochfestes äußeres Sieb.The document DE10303959 A1 shows a positive displacement dewatering press for dewatering a fibrous web by displacing water by means of gas and mechanical pressure. It comprises a gas pressure-generating blow roll, a guided together with the fibrous web around the blow roll, lying between the fibrous web and the blow roll gas-permeable inner carrier tape and at least one guided around the blow roll, lying on the side remote from the blow roll and the carrier tape side of the fibrous web, the mechanical pressure generating, in particular high-strength outer screen.

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 im Umschligungsbereich auf der, der Presswalze gegenüberliegenden Seite der Tissuebahn zwei Bänder angeordnet sind, wobei das äußere Band ein wasserdurchlässiges Press-Band bildet und das zwischen der Tissuebahn und dem Press-Band angeordnete, in Kontakt mit der Tissuebahn kommende Band als wasserduchlässiger Filz ausgebildet ist.According to the invention, this object is achieved in that in the Umschligungsbereich on the, the press roll opposite side of the tissue web two bands are arranged, wherein the outer band forms a water-permeable press belt and arranged between the tissue web and the press belt, in contact with the Tissuebahn upcoming band is designed as wasserduchlässiger felt.

Die Blasluft bewirkt eine Durchlufttrocknung der Tissuebahn im Umschlingungsbereich der Presswalze auf sehr kostengünstige Weise, zumal Druckluft bei der derartigen Maschinen in ausreichender Menge zur Verfügung steht.The blowing air causes a Durchlufttrocknung the tissue 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 Tissuebahn ausgeübt werden, was die Entwässerung unterstützt.During the wrapping, a pressing pressure can be exerted on the tissue 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 Tissuebahn 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 tissue web into the water collecting device.

Das Press-Band kann als Steb ausgebildet sein.The pressing band can be designed as a stem.

Zur Realisierung einer, wenn auch geringen Vorpressung sollten die Bänder vor der Presswalze gemeinsam mit der Tissuebahn zumindest eine Leitwalze um-schlingen, welche auf der, der Presswalze gegenüberliegenden Seite der Tissuebahn 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 in front of the press roll together with the tissue web should at least wrap around a guide roll which is arranged on the side of the tissue web opposite the press roll. 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 Tissuebahn 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 tissue 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.

Zumindest das Press-Band sollte nach der Presswalze, vorzugsweise nach der Wegführung der Tissuebahn, eine angetriebene Leitwalze umschlingen. Wegen der hohen Zugfestigkeit des Press-Bandes ist es zur Einleitung der erforderlichen Antriebsleistung besonders geeignet.At least the press belt should after the press roll, preferably after the removal of the tissue web, 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 Tissuebahn 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 tissue 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.

Dabei ergeben sich ein minimierter Aufwand und eine sichere Bahnführung, wenn das zwischen der Presswalze und der Tissuebahn angeordnete Band die Tissuebahn von geiner 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 when the arranged between the press roll and the tissue web tape the tissue web of geiner upstream unit, in particular a headbox leads to a downstream unit, in particular a drying cylinder.

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

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

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

Die Tissuebahn 1 wird 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.The tissue web 1 is guided by an air-permeable guide belt 2 starting from a headbox 11 of the production 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 Tissuebahn 1 anschließend mit Hilfe eines Kreppschabers abgenommen und dabei gekreppt werden kann. Danach erfolgt die Aufrollung der Tissuebahn 1.During the wrapping of the drying cylinder 12, the drying takes place, so that the tissue web 1 can subsequently be removed with the aid of a creping doctor and thereby creped. Thereafter, the reeling of the tissue web 1.

Die Entwässerungsvorrichtung besitzt eine über der Tissuebahn 1 angeordnete, zylindrische und rotierende Presswalze 5. Diese Presswalze 5 wird von der Tissuebahn 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 pressure roller 5 arranged above the tissue web 1. This pressure roller 5 is looped around by the tissue web 1 together with the inner guide belt 2 and at least one outer and also air-permeable press belt 4.

Die Presswalze 5 ist als Blaswalze mit perforiertem Walzenmantel ausgebildet und richtet heiße Blasluft während der Umschlingung in Richtung der Tissuebahn 1. Während dieser Durchlufttrocknung wird Wasser aus der Tissuebahn 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 blower roll with a perforated roll shell and directs hot blast air during wrapping in the direction of the tissue web 1. During this Durchlufttrocknung water is driven from the tissue web 1 in the band 4 and from this in a relation to the press roll 5 arranged water collecting device 6.

Um diesen Luftstrom durch die Tissuebahn 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 tissue 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 Tissuebahn 1 während der Umschlingung der Presswalze 5 infolge der Bandspannung gegen das Führuns-Band 2, was zum Herauspres-sen von Wasser aus der Tissuebahn 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 presses the tissue web 1 during the wrapping of the press roll 5 due to the belt tension against the guide belt 2, which leads to squeezing out of water from the tissue 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 Tissuebahn 1 allein bis zum Trockenzylinder 12 weiter. Dort wird die Tissuebahn 1 von einer vom Führungs-Band 2 umschlungenen Presswalze 13 an den Trockenzylinder 12 gedrückt. Wegen der glatten Oberfläche des Trockenzylinders 12 bleibt die Faser-stoffbahn 1 anschließend an diesem haften, so dass das Führungs-Band 2 wegge-führt werden kann.After the press roller 5, the guide belt 2 continues the tissue web 1 alone up to the drying cylinder 12. There, the tissue web 1 is pressed against the drying cylinder 12 by a press roller 13 looped around by the guide belt 2. Because of the smooth surface of the drying cylinder 12, the fiber web 1 then adhere to this, so that the guide belt 2 can be wegge-leads.

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

Bei der in der Figur dargestellten Anordnung läuft zwischen dem Press-Band 4 und der Tissuebahn 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 als Filz ausgebildet.In the arrangement shown in the figure runs between the press belt 4 and the tissue 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 formed in the interest of a higher water absorbency as felt.

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

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

Nach der Umschlingung der Presswalze 5 und der Wegführung der Tissuebahn 1 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 wrapping of the press roll 5 and the removal of the tissue web 1, the press belt 4 wraps around the outer belt 3 a driven guide roll 10. Subsequently, both belts 3,4 can optionally be conditioned and returned to the guide roll 7.

Die Leitwalze 7 vor der Presswalze 5 hat einen Durchmesser von weniger als 800 mm, was die Wirkung der Bandspannung auf die Tissuebahn 1 erhöht.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 tissue 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 Tissuebahn 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 tissue web 1, the risk for the large drying cylinder 12 is reduced in the event of a tear of the belt 4 due to the high belt tensions.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Tissuebahntissue 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 (15)

  1. Device for dewatering a tissue web (1) in a machine for producing the same, in which the tissue web (1), together with at least one air-permeable and endlessly circulating belt (2, 3, 4) on each of both sides, wraps partly around a cylindrical and rotating press roll (5), and the press roll (5) is constructed as a blower roll which directs blown air towards the tissue web (1) in the wrap region,
    characterized in that
    in the wrap region, on the side of the tissue web (1) that is opposite the press roll (5), there are arranged two belts (3, 4), the outer belt (4) forming a water-permeable press belt, and the belt (3) arranged between the tissue web (1) and the press belt (4) and coming into contact with the tissue web (1) being formed as a water-permeable felt.
  2. Device according to Claim 1,
    characterized in that
    the press roll (5) directs hot blown air towards the tissue web (1).
  3. Device according to Claim 1 or 2,
    characterized in that
    in the wrap region of the press roll (5), the press belt (4) located on the outside with respect to the press roll (5) is assigned a water collecting device (6), which collects the water driven through the press belt (4).
  4. Device according to Claim 3,
    characterized in that
    the water collecting device (6) is implemented as a suction device.
  5. Device according to one of the preceding claims,
    characterized in that
    the press belt (4) is formed as a fabric.
  6. Device according to one of the preceding claims,
    characterized in that
    before the press roll (5), the belts (2, 3, 4), together with the tissue web (1), wrap around at least one guide roll (7), which is arranged on the side of the tissue web (1) that is opposite the press roll (5).
  7. Device according to one of the preceding claims,
    characterized in that
    before the press roll (5) in the web running direction (14) there is arranged a steam blower box (8), which applies hot steam to the belt (2) coming into contact with the press roll (5).
  8. Device according to Claim 6 and 7,
    characterized in that
    the steam blower box (8) is arranged opposite the guide roll (7).
  9. Device according to one of Claims 6 to 8,
    characterized in that
    the diameter of the guide roll (7) is less than 800 mm.
  10. Device according to one of the preceding claims,
    characterized in that
    after the press roll (5), at least the press belt (4) wraps around a driven guide roll (10).
  11. Device according to one of the preceding claims,
    characterized in that
    only one belt (2) is arranged between the tissue web (1) and the press roll (5).
  12. Device according to one of the preceding claims,
    characterized in that
    the press roll (5) is arranged above the tissue web (1).
  13. Machine for producing a tissue web, having a device according to one of the preceding claims.
  14. Machine according to Claim 13,
    characterized in that
    the belt (2) arranged between the press roll (5) and the tissue web (1) guides the tissue web (1) from an upstream unit, in particular a headbox (11), as far as a downstream unit, in particular a drying cylinder (12).
  15. Machine according to Claim 13 or 14,
    characterized in that
    the belt (2) arranged between the tissue web (1) and the press roll (5) has a structured surface in the contact region with the tissue web (1).
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

Publications (2)

Publication Number Publication Date
EP1852551A1 EP1852551A1 (en) 2007-11-07
EP1852551B1 true EP1852551B1 (en) 2014-03-19

Family

ID=38169311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070107298 Not-in-force EP1852551B1 (en) 2006-05-05 2007-05-02 Dewatering device

Country Status (2)

Country Link
EP (1) EP1852551B1 (en)
DE (1) DE102006021328A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006062234A1 (en) * 2006-12-22 2008-06-26 Voith Patent Gmbh Method and device for drying a fibrous web
DE102006062235A1 (en) 2006-12-22 2008-06-26 Voith Patent Gmbh Method and device 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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
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
US5814190A (en) * 1994-06-29 1998-09-29 The Procter & Gamble Company Method for making paper web having both bulk and smoothness
FR2733522B1 (en) * 1995-04-28 1997-06-20 Kaysersberg Sa METHOD AND DEVICE FOR PRODUCING A SHEET OF PAPER WITH CROSS-AIR PRE-DRYING
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
US7297233B2 (en) * 2004-01-30 2007-11-20 Voith Paper Patent Gmbh Dewatering apparatus in a paper machine

Also Published As

Publication number Publication date
DE102006021328A1 (en) 2007-11-08
EP1852551A1 (en) 2007-11-07

Similar Documents

Publication Publication Date Title
EP2699728B1 (en) Apparatus and method of producing a fibre web
EP1954877B1 (en) Tissue machine
EP1754824A1 (en) Method for making tissue paper
EP0926296B1 (en) Machine for making a paper web, in particular a tissue web
EP3212843B1 (en) Device for dewatering a fiber web
EP1852551B1 (en) Dewatering device
EP3919677A1 (en) Method and device for producing a structured sheet of fibrous material
EP1817454A1 (en) Machine for producing a material web
EP1156155B1 (en) Dryer section of a machine for manufacturing a paper or board web
EP0894894A2 (en) Process and apparatus for forming a paper web
DE102018124016A1 (en) Device and method for dewatering a fibrous web
AT521367B1 (en) DEVICE AND METHOD FOR CONVERTING A STRIP OF A TRAIN
WO2020030509A1 (en) Pressing arrangement
EP1100605B1 (en) Thickener
AT521368B1 (en) DEVICE AND METHOD FOR CONVERTING A STRIP OF A TRAIN
EP1838919B1 (en) Pressing arrangement
WO2021069127A1 (en) Tissue machine
EP1342837B1 (en) Pressing arrangement
DE10231074A1 (en) De-watering press for paper or carton has transfer assembly with temporary lift-off of dewatering belt and renewed contact with web
EP1512789B1 (en) Web transfer
DE102005048928A1 (en) Press for dewatering and smoothing a paper web comprises an extended press nip and a calender nip between which the web runs with no open draw
EP1985751A2 (en) Drying section of a paper machine
EP1564328A1 (en) Hot-air web-drying
DE10213144A1 (en) Press arrangement
DE102011006634A1 (en) Paper machine for producing e.g. paper web, has drying belt pressing web against heated sleeve surface of cylinder, where web unsupportedly runs from cylinder till transfer through another drying belt after guiding away of former belt

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

17P Request for examination filed

Effective date: 20080507

17Q First examination report despatched

Effective date: 20080605

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20131018

INTG Intention to grant announced

Effective date: 20131025

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 657785

Country of ref document: AT

Kind code of ref document: T

Effective date: 20140415

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502007012875

Country of ref document: DE

Effective date: 20140430

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20140319

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140719

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140619

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502007012875

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140721

Ref country code: LU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140502

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140531

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140531

26N No opposition filed

Effective date: 20141222

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20140619

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20150130

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502007012875

Country of ref document: DE

Effective date: 20141222

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140502

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140602

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140619

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20150513

Year of fee payment: 9

Ref country code: SE

Payment date: 20150520

Year of fee payment: 9

Ref country code: DE

Payment date: 20150521

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20150521

Year of fee payment: 9

Ref country code: IT

Payment date: 20150513

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140620

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140319

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140531

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20070502

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502007012875

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 657785

Country of ref document: AT

Kind code of ref document: T

Effective date: 20160502

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160502

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160502

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160503

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160502

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161201