EP1960594B1 - Web monitoring - Google Patents

Web monitoring Download PDF

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Publication number
EP1960594B1
EP1960594B1 EP06819113A EP06819113A EP1960594B1 EP 1960594 B1 EP1960594 B1 EP 1960594B1 EP 06819113 A EP06819113 A EP 06819113A EP 06819113 A EP06819113 A EP 06819113A EP 1960594 B1 EP1960594 B1 EP 1960594B1
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EP
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Prior art keywords
suction
web
vacuum
zones
belt
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EP06819113A
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German (de)
French (fr)
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EP1960594A1 (en
Inventor
Torben Schlieckau
Roland Mayer
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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
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0036—Paper-making control systems controlling the press or drying section

Definitions

  • the invention relates to a method and a device for web monitoring in a machine for producing and / or finishing a paper, board, tissue or another fibrous web, according to the preamble of claim 1 and of claim 13.
  • Such a method and such Device are from the document DE 43 22 244 A known.
  • the function of the optical sensors is easily affected by contamination.
  • the object of the invention is therefore to better and safely monitor the web guide of the fibrous web.
  • the web monitoring should be applied at a normal vacuum level of at least 2000 Pa in the suction zones in relation to the surroundings.
  • a lift off of a web edge or a demolition usually leads to a lowering of the vacuum level by 1000 Pa, which can be detected by the vacuum sensors relatively easily and safely.
  • the drying unit and the suction devices themselves it may be advantageous if at least two suction zones are spaced apart from each other and / or at least two suction zones are immediately adjacent. Likewise, it may be advantageous if the suction zones are formed by only one suction device or by a plurality of suction devices.
  • At least one vacuum sensor within the suction device and / or is arranged in the suction channel may also be advantageous if at least one vacuum sensor within the suction device and / or is arranged in the suction channel.
  • the hot air blowing should be deactivated.
  • At least one vacuum sensor is arranged between the suction device and the belt.
  • the free side of the fibrous web is blown with hot air.
  • the cover of the band falls away through the fibrous web.
  • thermal damage of the tape may occur.
  • the lifting of the web edges can lead to one or even breaks the fibrous web, which is why this should also be monitored.
  • a plurality of suction devices are arranged next to one another in the web running direction and / or transversely to the web running direction.
  • each suction device forms only one suction zone or at least one suction device a plurality of suction zones.
  • At least one suction device can be formed by an evacuated roll, which is wrapped by the belt and the outer fibrous web.
  • roller is aspirated via a suction box arranged in the non-looped region, it can also be advantageous for simplifying the measuring arrangement if at least one vacuum sensor is arranged in the suction box.
  • At least one suction device can also be formed by a suction box, on which the strip is guided along at a distance.
  • the fibrous web 1 is guided by an air-permeable belt 8,9,23 through a drying unit.
  • the free side of the fibrous web 1 is blown with hot air for drying of hot air hoods 4,5,21,22.
  • the negative pressure of these suction devices 2, 3, 16, 17, 20 can be used to detect a break-off.
  • the suction devices 2, 3, 16, 17, 20 absorb so much false air through the band 8, 9, 23 that there is a marked decrease in the low-pressure level, i. more than 1000 Pa comes.
  • the fibrous web 1 is performed together with the belt 8.9 successively via two suction devices 2.3 in the form of evacuated rollers.
  • rollers are thereby sucked from the outside via a suction box 6 arranged in the non-wrapped peripheral area.
  • the fibrous web 1 is transferred from a belt 11 of an upstream machine unit to an air-permeable transfer belt 10, wherein the transfer of a looped by the transfer belt 10 Saugleitwalze 12 is supported.
  • This transfer belt 10 transfers the fibrous web 1 subsequently to the belt 8 of the first suction device 2.
  • the fibrous web 1 After the H thoroughlyluftbeblasung the fibrous web 1 during the looping of the suction device 2 via a hot air hood 4, the fibrous web 1 is transferred to the belt 9 of the following suction device 3. Also there, the free side of the fibrous web 1 is blown by a hot air hood 5 with hot air during wrapping.
  • the fibrous web 1 is guided by an air-permeable belt 23 meandering alternately over heated drying cylinders 14 and guide rollers 15, the belt 23, the fibrous web 1 presses against the hot surface of the drying cylinder 14.
  • the belt 23 carries the fibrous web 1 over two treatment sections, in which the fibrous web 1 is subjected to hot air for drying.
  • the band 23 wraps slightly around the outer fibrous web 1 a suction device 16 in the form of a suctioned by an outer suction box 18 roller.
  • the belt 23 is guided by the fibrous web 1 around a suction device 17 in the form of a drawn-out roller.
  • the belt 23 again wraps around the suction device 16.
  • the belt 23 is guided for support via guide rollers 19.
  • the suction devices 16,17 and these guide rollers 19 and between the guide rollers 19 itself are stationary suction devices 20 in the form of suction boxes, where the tape 23 passes by at a distance.
  • the hot air hoods 21,22 for H adopted constitutional purposes are located outside the area enclosed by the band 23.
  • the vacuum monitoring over several suction zones in the web running direction 13 enables rapid detection and localization of a web break.
  • the outer separate suction zones should have a maximum extension of 500 mm transverse to the web running direction 13.

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Abstract

The invention relates to a method and a device for web monitoring in a machine for producing and/or refining a web (1) of paper, cardboard, tissue or other fiber material. The web of fiber (1) is supported by an air-permeable belt (8, 9, 23), is impinged upon with hot air by means of at least one hot-air hood (4, 5, 21, 22), the belt (8, 9, 23) being subjected to suction on the face opposite the web of fiber (1) prior to and/or during and/or after hot air impingement. The aim of the invention is to improve monitoring of the web of fiber (1). For this purpose, suction is carried out via one or more suction devices (2, 3, 16, 17, 20) in a plurality of separate suction zones, the vacuum in at least two suction zones being detected by means of respective vacuum sensors (7) and the values measured by the vacuum sensors (7) being supplied to a control unit.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Bahnüberwachung in einer Maschine zur Herstellung und/oder Veredelung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn, gemäß dem Obergegriff des Anspruchs 1 sowie des Anspruchs 13. Ein derartiges Verfahren und eine derartige Vorrichtung sind aus dem Dokument DE 43 22 244 A bekannt.The invention relates to a method and a device for web monitoring in a machine for producing and / or finishing a paper, board, tissue or another fibrous web, according to the preamble of claim 1 and of claim 13. Such a method and such Device are from the document DE 43 22 244 A known.

In modernen Papiermaschinen erfolgt die Abrisserkennung der Papierbahn in Trockengruppen meist mittels optischer Sensoren.In modern paper machines, the demolition detection of the paper web in drying groups is usually carried out by means of optical sensors.

Bei Trocknungsstrecken mit Heißluftbeblasung ist die Anordnung optischer Sensoren jedoch aus Platzgründen und wegen der Temperaturempfindlichkeit der Sensoren nicht möglich.For drying lines with Heißluftbeblasung the arrangement of optical sensors, however, for reasons of space and because of the temperature sensitivity of the sensors is not possible.

Außerdem wird die Funktion der optischen Sensoren leicht durch Verschmutzung beeinträchtigt.In addition, the function of the optical sensors is easily affected by contamination.

Des Weiteren ist es damit nicht möglich, ein Abheben eines Randes der Faserstoffbahn mit der damit verbundenen Gefahr von Bahnflattern und Ein- oder Abrissen zu erkennen.Furthermore, it is thus not possible to detect a lifting of an edge of the fibrous web with the associated risk of web flutter and tearing or breakage.

Die Aufgabe der Erfindung ist es daher, die Bahnführung der Faserstoffbahn besser und sicher zu überwachen.The object of the invention is therefore to better and safely monitor the web guide of the fibrous web.

Erfindungsgemäß wurde die Aufgabe hinsichtlich des Verfahrens die Merkmale des kennzeichnenden Teils des Anspruchs 1 durch gelöst.According to the task with respect to the method, the features of the characterizing part of claim 1 was solved by.

Die Auswertung von zwei Saugzonen über den Unterdruck verbessert die Sicherheit der Bahnüberwachung erheblich. Kommt es zu einem Abriss oder einem Abheben der Faserstoffbahn oder eines Randes der Faserstoffbahn, so vermindert sich der Unterdruck in der nicht mehr oder nur unzureichend von der Faserstoffbahn abgedeckten Saugzone erheblich. Luft wird dabei verstärkt durch das Band in die Saugeinrichtung gesaugt, was die Unterdruckabsenkung zur Folge hat.The evaluation of two suction zones via the negative pressure considerably improves the safety of the web monitoring. If it comes to a demolition or lifting of the fibrous web or an edge of the fibrous web, so the negative pressure in the no longer or only insufficiently covered by the fibrous web suction zone significantly reduced. Air is thereby increasingly sucked through the belt in the suction device, which has the negative pressure reduction.

Um die Absenkung des Unterdruckniveaus sicher auswerten zu können, sollte die Anwendung der Bahnüberwachung bei einem normalem Unterdruckniveau von mindestens 2000 Pa in den Saugzonen gegenüber der Umgebung erfolgen.In order to be able to evaluate the lowering of the vacuum level safely, the web monitoring should be applied at a normal vacuum level of at least 2000 Pa in the suction zones in relation to the surroundings.

Ein Abheben eines Bahnrandes oder ein Abriss führt in der Regel zu einem Absenken des Unterdruckniveaus um 1000 Pa, was von den Unterdrucksensoren relativ leicht und sicher erfasst werden kann.A lift off of a web edge or a demolition usually leads to a lowering of the vacuum level by 1000 Pa, which can be detected by the vacuum sensors relatively easily and safely.

Dabei ist es vorteilhaft, wenn in Bahnlaufrichtung mehrere Saugzonen hintereinander angeordnet sind. Sollte in beiden Saugzonen der Unterdruck abfallen, so kann sicher auf eine Störung geschlossen werden.It is advantageous if several suction zones are arranged one behind the other in the web running direction. If the negative pressure drops in both suction zones, then it is safe to infer a malfunction.

Dies gilt auch insbesondere hinsichtlich der Überwachung des Randabhebens, weshalb es ebenso von Vorteil ist, wenn quer zur Bahnlaufrichtung mehrere Saugzonen nebeneinander angeordnet sind.This also applies in particular with regard to monitoring the edge lifting, which is why it is also advantageous if several suction zones are arranged side by side transversely to the web running direction.

Entsprechend der Konstruktion der Trocknungseinheit sowie der Saugeinrichtungen selbst, kann es vorteilhaft sein, wenn wenigstens zwei Saugzonen voneinander beabstandet sind und/oder wenigstens zwei Saugzonen unmittelbar benachbart sind.
Desgleichen kann es von Vorteil sein, wenn die Saugzonen von nur einer Saugeinrichtung oder aber von mehreren Saugeinrichtungen gebildet werden.According to the design of the drying unit and the suction devices themselves, it may be advantageous if at least two suction zones are spaced apart from each other and / or at least two suction zones are immediately adjacent.
Likewise, it may be advantageous if the suction zones are formed by only one suction device or by a plurality of suction devices.

In Abhängigkeit von der Gestaltung der Saugeinrichtung kann es ebenso vorteilhaft sein, wenn wenigstens ein Unterdrucksensor innerhalb der Saugeinrichtung und/oder in deren Absaugekanal angeordnet ist.Depending on the design of the suction device, it may also be advantageous if at least one vacuum sensor within the suction device and / or is arranged in the suction channel.

Bei einem über die entsprechenden Unterdrucksensoren erkannten Unterdruckabfall in der einzigen oder zumindest zwei in Bahnlaufrichtung hintereinander angeordneten Saugzonen sollte die Heißluftbeblasung deaktiviert werden.In the case of a negative pressure drop detected in the single or at least two suction zones arranged one after the other in the web running direction via the corresponding vacuum sensors, the hot air blowing should be deactivated.

Dies verhindert eine Beschädigung des Bandes durch die Heißluft, da bei einem Abriss die isolierende Faserstoffbahn zwischen Heißlufthaube und Band fehlt.This prevents damage to the band by the hot air, as in an outline the insulating fibrous web between the hot air hood and the band is missing.

Bei einem über die entsprechenden Unterdrucksensoren erkannten Unterdruckabfall in nur einer oder beiden äußeren, der quer zur Bahnlaufrichtung angeordneten Saugzonen sollten Maßnahmen zur Reduzierung des Randabhebens der Faserstoffbahn eingeleitet werden.With a negative pressure drop detected in only one or both of the outer suction zones, which are arranged transversely to the web running direction, measures should be taken to reduce the edge lifting of the fibrous web.

Dabei ist es von Vorteil, wenn zur Reduzierung des Randabhebens das Unterdruckniveau in den entsprechenden äußeren Saugzonen erhöht wird und/oder die Faserstoffbahn zur Reduzierung des Randabhebens durch einen zusätzlichen Zugaufbau gespannt wird.It is advantageous if the vacuum level in the corresponding outer suction zones is increased to reduce the edge lifting and / or the fibrous web is stretched to reduce the edge lifting by an additional Zugaufbau.

Hinsichtlich der Vorrichtung ist erfindungswesentlich, dass zumindest ein Unterdrucksensor zwischen der Saugeinrichtung und dem Band angeordnet ist.With regard to the device, it is essential to the invention that at least one vacuum sensor is arranged between the suction device and the belt.

Dabei wird die freie Seite der Faserstoffbahn mit Heißluft beblasen. Bei einem Abriss fällt die Abdeckung des Bandes durch die Faserstoffbahn weg. Infolgedessen kann es zur thermischen Beschädigung des Bandes kommen.The free side of the fibrous web is blown with hot air. In an outline, the cover of the band falls away through the fibrous web. As a result, thermal damage of the tape may occur.

Das Abheben der Bahnränder kann zu Ein- oder gar Abrissen der Faserstoffbahn führen, weshalb auch dies überwacht werden sollte.The lifting of the web edges can lead to one or even breaks the fibrous web, which is why this should also be monitored.

Je nach Konstruktion der Trocknungseinheit und der Gestaltung der Saugeinrichtungen sowie den Anforderungen hinsichtlich der Bahnüberwachung kann es vorteilhaft sein, wenn in Bahnlaufrichtung mehrere Saugeinrichtungen hintereinander und/oder quer zur Bahnlaufrichtung mehrere Saugeinrichtungen nebeneinander angeordnet sind.Depending on the design of the drying unit and the design of the suction devices and the requirements with regard to web monitoring, it may be advantageous if a plurality of suction devices are arranged next to one another in the web running direction and / or transversely to the web running direction.

Desgleichen kann es von Vorteil sein, wenn jede Saugeinrichtung nur eine Saugzone oder zumindest eine Saugeinrichtung mehrere Saugzonen bildet.Likewise, it can be advantageous if each suction device forms only one suction zone or at least one suction device a plurality of suction zones.

Entsprechend den Anforderungen kann wenigstens eine Saugeinrichtung von einer besaugten Walze gebildet werden, welche vom Band und der außen liegenden Faserstoffbahn umschlungen wird.According to the requirements, at least one suction device can be formed by an evacuated roll, which is wrapped by the belt and the outer fibrous web.

Dabei ist es für die sichere Funktion vorteilhaft, wenn wenigstens ein Unterdrucksensor innerhalb der Walze angeordnet ist.It is advantageous for safe operation, if at least one vacuum sensor is disposed within the roller.

Falls die Walze über einen, im nicht-umschlungenen Bereich angeordneten Saugkasten besaugt wird, so kann es zur Vereinfachung der Messanordnung auch von Vorteil sein, wenn zumindest ein Unterdrucksensor im Saugkasten angeordnet ist.If the roller is aspirated via a suction box arranged in the non-looped region, it can also be advantageous for simplifying the measuring arrangement if at least one vacuum sensor is arranged in the suction box.

Entsprechend den Anforderungen kann aber auch wenigstens eine Saugeinrichtung von einem Saugkasten gebildet werden, an dem das Band beabstandet entlang geführt wird.However, according to the requirements, at least one suction device can also be formed by a suction box, on which the strip is guided along at a distance.

Hierbei ist es für eine schnelle und sichere Unterdruckmessung von Vorteil, wenn zumindest ein Unterdrucksensor zwischen dem Saugkasten und dem Band angeordnet ist.In this case, it is advantageous for fast and reliable negative pressure measurement if at least one vacuum sensor is arranged between the suction box and the band.

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

Figur 1:
einen schematischen Querschnitt durch eine Trocknungseinheit mit Heißlufthauben und
Figur 2:
eine andere Gestaltung der Trocknungseinheit.
The invention will be explained in more detail below with reference to several exemplary embodiments. In the attached drawing shows:
FIG. 1:
a schematic cross section through a drying unit with hot air hoods and
FIG. 2:
another design of the drying unit.

In beiden Fällen wird die Faserstoffbahn 1 von einem luftdurchlässigen Band 8,9,23 durch eine Trocknungseinheit geführt. Dabei wird die freie Seite der Faserstoffbahn 1 zur Trocknung von Heißlufthauben 4,5,21,22 mit Heißluft beblasen.In both cases, the fibrous web 1 is guided by an air-permeable belt 8,9,23 through a drying unit. In this case, the free side of the fibrous web 1 is blown with hot air for drying of hot air hoods 4,5,21,22.

Um bei einem Abriss der Faserstoffbahn 1 eine thermische Beschädigung des Bandes 8,9,23 durch die Heißluft zu verhindern, ist eine sichere Bahnüberwachung nötig.In order to prevent a thermal damage of the belt 8,9,23 by the hot air in a demolition of the fibrous web 1, a secure web monitoring is necessary.

Da das Band 8,9,23 während der Heißluftbeblasung an Saugeinrichtungen 2,3,16,17,20 vorbeigeführt wird, kann der Unterdruck dieser Saugeinrichtungen 2,3,16,17,20 zur Erfassung eines Abrisses benutzt werden. Fehlt die Faserstoffbahn 1, so saugen die Saugeinrichtungen 2,3,16,17,20 nämlich so viel Falschluft durch das Band 8,9,23 an, dass es zu einer starken Absenkung des Unterdruckniveaus, d.h. mehr als 1000 Pa kommt.Since the belt 8, 9, 23 is guided past suction devices 2, 3, 16, 17, 20 during the hot-air blowing, the negative pressure of these suction devices 2, 3, 16, 17, 20 can be used to detect a break-off. In fact, if the fibrous web 1 is missing, the suction devices 2, 3, 16, 17, 20 absorb so much false air through the band 8, 9, 23 that there is a marked decrease in the low-pressure level, i. more than 1000 Pa comes.

In diesem Fall, erst recht wenn dies in zwei hintereinander liegenden Saugeinrichtungen 2,3,1,17,20 von Unterdrucksensoren erkannt wird, wird die Heißluftbeblasung eingestellt und werden die Heißlufthauben 4,5,21,22 von dem Band 8,9,23 weggeschwenkt.In this case, especially when this is detected in two suction devices 2,3,1,17,20 successive suction pressure sensors, the Heißluftbeblasung is set and the hot air hoods are 4,5,21,22 from the belt 8,9,23 pivoted away.

Das Wegschwenken verhindert einen Papierstau.Swinging away prevents a paper jam.

Auch wenn ein Rand der Faserstoffbahn 1 sich etwas von dem Band 8,9,23 abhebt, wird Falschluft angesaugt. Um das Abheben zu erfassen, besitzen einzelne Saugeinrichtungen 2,3,16,17,20 mehrere quer zur Bahnlaufrichtung 13 nebeneinander angeordnete Saugzonen. Sinkt nur in einer oder beiden äußeren Saugzonen der Unterdruck ab, so deutet dies relativ sicher auf das Ansaugen von Falschluft und damit ein Abheben des entsprechenden Randes der Faserstoffbahn 1 hin.Even if an edge of the fibrous web 1 is slightly lifted from the belt 8,9,23, false air is sucked. In order to detect the lifting, individual suction devices 2,3,16,17,20 have a plurality of suction zones arranged juxtaposed transversely to the web running direction 13. If the negative pressure only drops in one or both of the outer suction zones, this indicates relatively reliably the suction of False air and thus lifting the corresponding edge of the fibrous web 1 out.

Da dies zu Ein- oder Abrissen führen kann, wird der Unterdruck in der entsprechenden Saugzone zur verstärkten Ansaugung des Randes der Faserstoffbahn 1 erhöht.Since this can lead to tearing or tearing, the negative pressure in the corresponding suction zone for increased suction of the edge of the fibrous web 1 is increased.

Bei der Trocknungsanordnung gemäß Figur 1 wird die Faserstoffbahn 1 gemeinsam mit dem Band 8,9 nacheinander über zwei Saugeinrichtungen 2,3 in Form besaugter Walzen geführt.In the drying arrangement according to FIG. 1 the fibrous web 1 is performed together with the belt 8.9 successively via two suction devices 2.3 in the form of evacuated rollers.

Die Walzen werden dabei von außen über einen, im nicht-umschlungenen Umfangsbereich angeordneten Saugkasten 6 besaugt.The rollers are thereby sucked from the outside via a suction box 6 arranged in the non-wrapped peripheral area.

Hier befinden sich die Unterdrucksensoren 7 zur Erfassung einer Störung der Bahnführung in den Saugkästen 6 der Walzen.Here are the vacuum sensors 7 for detecting a disturbance of the web guide in the suction boxes 6 of the rollers.

Dabei wird die Faserstoffbahn 1 von einem Band 11 einer vorgelagerten Maschineneinheit an ein luftdurchlässiges Übergabeband 10 übergeben, wobei die Übergabe von einer vom Übergabeband 10 umschlungenen Saugleitwalze 12 unterstützt wird.In this case, the fibrous web 1 is transferred from a belt 11 of an upstream machine unit to an air-permeable transfer belt 10, wherein the transfer of a looped by the transfer belt 10 Saugleitwalze 12 is supported.

Dieses Übergabeband 10 übergibt die Faserstoffbahn 1 anschließend an das Band 8 der ersten Saugeinrichtung 2.This transfer belt 10 transfers the fibrous web 1 subsequently to the belt 8 of the first suction device 2.

Nach der Heißluftbeblasung der Faserstoffbahn 1 während der Umschlingung der Saugeinrichtung 2 über eine Heißlufthaube 4 wird die Faserstoffbahn 1 an das Band 9 der folgenden Saugeinrichtung 3 übergeben. Auch dort wird während der Umschlingung die freie Seite der Faserstoffbahn 1 von einer Heißlufthaube 5 mit Heißluft beblasen.After the Heißluftbeblasung the fibrous web 1 during the looping of the suction device 2 via a hot air hood 4, the fibrous web 1 is transferred to the belt 9 of the following suction device 3. Also there, the free side of the fibrous web 1 is blown by a hot air hood 5 with hot air during wrapping.

Bei der in Figur 2 dargestellten Trocknungsanordnung wird die Faserstoffbahn 1 von einem luftdurchlässigen Band 23 mäanderförmig abwechselnd über beheizte Trockenzylinder 14 und Leitwalzen 15 geführt, wobei das Band 23 die Faserstoffbahn 1 gegen die heiße Mantelfläche der Trockenzylinder 14 drückt.At the in FIG. 2 illustrated drying arrangement, the fibrous web 1 is guided by an air-permeable belt 23 meandering alternately over heated drying cylinders 14 and guide rollers 15, the belt 23, the fibrous web 1 presses against the hot surface of the drying cylinder 14.

Zwischen zwei Trockenzylindern 14 führt das Band 23 die Faserstoffbahn 1 jedoch über zwei Behandlungsstrecken, in denen die Faserstoffbahn 1 zur Trocknung mit Heißluft beaufschlagt wird.However, between two drying cylinders 14, the belt 23 carries the fibrous web 1 over two treatment sections, in which the fibrous web 1 is subjected to hot air for drying.

Während die erste Behandlungsstrecke von Trockenzylinder 14 nach unten führt, gelangt die Faserstoffbahn 1 über die zweite Behandlungsstrecke wieder zum folgenden Trockenzylinder 14 nach oben.While the first treatment section leads from drying cylinder 14 downwards, the fibrous web 1 again reaches the following drying cylinder 14 via the second treatment section.

Am Beginn der ersten Behandlungsstrecke umschlingt das Band 23 mit der außen liegenden Faserstoffbahn 1 geringfügig eine Saugeinrichtung 16 in Form einer, von einem äußeren Saugkasten 18 besaugten Walze.At the beginning of the first treatment section, the band 23 wraps slightly around the outer fibrous web 1 a suction device 16 in the form of a suctioned by an outer suction box 18 roller.

Zwischen den Behandlungsstrecken wird das Band 23 mit der Faserstoffbahn 1 um eine Saugeinrichtung 17 in Form einer besaugten Walze geführt.Between the treatment sections, the belt 23 is guided by the fibrous web 1 around a suction device 17 in the form of a drawn-out roller.

Am Ende der zweiten Behandlungsstrecke umschlingt das Band 23 wieder die Saugeinrichtung 16.At the end of the second treatment section, the belt 23 again wraps around the suction device 16.

Zwischen den Saugeinrichtungen 16,17 wird das Band 23 zur Abstützung über Leitwalzen 19 geführt. Zwischen den Saugeinrichtungen 16,17 und diesen Leitwalzen 19 sowie zwischen den Leitwalzen 19 selbst befinden sich stationäre Saugeinrichtungen 20 in Form von Saugkästen, an denen das Band 23 beabstandet vorbeiläuft.Between the suction devices 16, 17, the belt 23 is guided for support via guide rollers 19. Between the suction devices 16,17 and these guide rollers 19 and between the guide rollers 19 itself are stationary suction devices 20 in the form of suction boxes, where the tape 23 passes by at a distance.

Der Abstand zwischen diesen stationären Saugeinrichtungen 20 und dem Band 23 verhindert eine Beschädigung derselben.The distance between these stationary suction devices 20 and the belt 23 prevents damage to them.

Zur Überwachung der Bahnführung befinden sich in den Walzen der Saugeinrichtungen 16,17 sowie dem Saugkasten 18 Unterdrucksensoren 7.To monitor the web guide located in the rollers of the suction devices 16,17 and the suction box 18 vacuum sensors. 7

Außerdem befindet sich ein Unterdrucksensor 7 zwischen der stationären Saugeinrichtung 20 und dem Band 23, vorzugsweise in der nach unten laufenden Behandlungsstrecke.In addition, there is a vacuum sensor 7 between the stationary suction device 20 and the belt 23, preferably in the downward treatment path.

Die Heißlufthauben 21,22 zur Heißluftbeblasung innerhalb der Behandlungsstrecken befinden sich außerhalb des von dem Band 23 eingeschlossenen Bereiches.The hot air hoods 21,22 for Heißluftbeblasung within the treatment lines are located outside the area enclosed by the band 23.

Die Unterdrucküberwachung über mehrere Saugzonen in Bahnlaufrichtung 13 ermöglicht eine schnelle Erfassung und Lokalisierung eines Bahnabrisses.The vacuum monitoring over several suction zones in the web running direction 13 enables rapid detection and localization of a web break.

Für die sichere Überwachung der Bahnränder hinsichtlich des Abhebens sollten die äußeren separaten Saugzonen quer zur Bahnlaufrichtung 13 eine Ausdehnung von maximal 500 mm aufweisen.For the safe monitoring of the web edges with regard to the lifting, the outer separate suction zones should have a maximum extension of 500 mm transverse to the web running direction 13.

Claims (22)

  1. Method for web monitoring in a machine for producing and/or finishing a paper, board, tissue or other fibrous web (1), in which the fibrous web (1), supported by an air-permeable belt (8, 9, 23), has hot air applied to it, the belt (8, 9, 23) being evacuated on the side opposite the fibrous web (1) before and/or during and/or after the application of hot air, the evacuation being provided by one or more suction devices (2, 3, 16, 17, 20) in a plurality of separate suction zones, the vacuum in at least two suction zones being registered via at least one vacuum sensor (7) in each case and the measured values from the vacuum sensors (7) being fed to a control unit,
    characterized in that
    at least one vacuum sensor (7) is arranged between the belt (8, 9, 23) and the suction device (2, 3, 16, 17, 20).
  2. Method according to Claim 1, characterized in that a plurality of suction zones are arranged one after another in the web running direction (13).
  3. Method according to Claim 1 or 2, characterized in that a plurality of suction zones are arranged beside one another transversely with respect to the web running direction (13).
  4. Method according to one of the preceding claims, characterized in that at least two suction zones are spaced apart from one another.
  5. Method according to one of the preceding claims, characterized in that at least two suction zones are immediately adjacent.
  6. Method according to one of the preceding claims, characterized in that the suction zones are formed by only one suction device (2, 3, 16, 17, 20).
  7. Method according to one of Claims 1 to 5,
    characterized in that the suction zones are formed by a plurality of suction devices (2, 3, 16, 17, 20).
  8. Method according to one of the preceding claims, characterized in that at least one vacuum sensor (7) is arranged inside the suction device (2, 3, 16, 17, 20) and/or its suction duct.
  9. Method according to one of the preceding claims, characterized in that, in the event of a drop in vacuum in the single suction zone or at least two suction zones arranged one after another in the web running direction (13), detected via the corresponding vacuum sensors (7), the blowing of hot air is deactivated.
  10. Method according to one of the preceding claims, characterized in that, in the event of a drop in vacuum in only one or both of the outer suction zones arranged transversely with respect to the web running direction (13), detected by means of the corresponding vacuum sensors, measures for reducing the lifting of the edge of the fibrous web (1) are initiated.
  11. Method according to Claim 10, characterized in that, to reduce the lifting of the edge, the level of vacuum in the corresponding outer suction zones is increased.
  12. Method according to Claim 10 or 11, characterized in that, to reduce the lifting of the edge, the fibrous web (1) is tensioned by an additional draw structure.
  13. Apparatus for web monitoring in a machine for producing and/or finishing a paper, board, tissue or other fibrous web (1), in which the fibrous web (1), supported by an air-permeable belt (8, 9, 23), has hot air applied to it via at least one hot-air hood (4, 5, 21, 22), the belt (8, 9, 23) being evacuated on the side opposite the fibrous web (1) before and/or during and/or after the application of hot air, the evacuation being provided by one or more suction devices (2, 3, 16, 17, 20) in a plurality of separate suction zones, the vacuum in at least two suction zones being registered via at least one vacuum sensor (7) in each case and the vacuum sensors (7) being connected to a control unit, in particular for implementing the method according to one of the preceding claims,
    characterized in that
    at least one vacuum sensor (7) is arranged between the suction device (2, 3, 16, 17, 20) and the belt (23).
  14. Apparatus according to Claim 13, characterized in that a plurality of suction devices (2, 3, 16, 17, 20) are arranged one after another in the web running direction (13).
  15. Apparatus according to Claim 13 or 14,
    characterized in that a plurality of suction devices (2, 3, 16, 17, 20) are arranged beside one another transversely with respect to the web running direction (13).
  16. Apparatus according to Claim 14 or 15,
    characterized in that each suction device (2, 3, 16, 17, 20) forms only one suction zone.
  17. Apparatus according to one of Claims 13 to 15, characterized in that at least one suction device (2, 3, 16, 17, 20) forms a plurality of suction zones.
  18. Apparatus according to one of Claims 13 to 17, characterized in that at least one suction device (2, 3, 16, 17) is formed by an evacuated roll.
  19. Apparatus according to Claim 18, characterized in that at least one vacuum sensor (7) is arranged inside the roll.
  20. Apparatus according to Claim 18 or 19,
    characterized in that the roll is evacuated via a suction box (6, 18) arranged in the non-wrapped region, and preferably at least one vacuum sensor (7) is arranged in the suction box (6, 18).
  21. Apparatus according to one of Claims 13 to 20, characterized in that at least one suction device (20) is formed by a suction box along which the belt (23) is guided so as to be spaced apart.
  22. Use of the method for web monitoring according to one of Claims 1 - 12 or use of the apparatus for web monitoring according to one of Claims 13 - 21 with a vacuum level of at least 2000 Pa in the suction zones.
EP06819113A 2005-12-02 2006-10-23 Web monitoring Not-in-force EP1960594B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005057638A DE102005057638A1 (en) 2005-12-02 2005-12-02 Web Inspection
PCT/EP2006/067645 WO2007062926A1 (en) 2005-12-02 2006-10-23 Web monitoring

Publications (2)

Publication Number Publication Date
EP1960594A1 EP1960594A1 (en) 2008-08-27
EP1960594B1 true EP1960594B1 (en) 2009-07-22

Family

ID=37887741

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06819113A Not-in-force EP1960594B1 (en) 2005-12-02 2006-10-23 Web monitoring

Country Status (5)

Country Link
EP (1) EP1960594B1 (en)
CN (1) CN101321911B (en)
AT (1) ATE437266T1 (en)
DE (2) DE102005057638A1 (en)
WO (1) WO2007062926A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021123077A1 (en) * 2021-09-07 2023-03-09 Voith Patent Gmbh Method and device for improving the drying process in a paper machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4980979A (en) * 1987-02-13 1991-01-01 Beloit Corporation Vacuum roll transfer apparatus
AT397111B (en) * 1991-12-19 1994-02-25 Andritz Patentverwaltung METHOD AND DEVICE FOR GUIDING FIBROUS MATERIALS
FI87669C (en) * 1992-03-02 1993-02-10 Valmet Paper Machinery Inc FOERFARANDE OCH TORK VID TORKNING AV PAPPER
AT397262B (en) * 1992-07-31 1994-03-25 Escher Wyss Gmbh SUCTION ROLLER
SE9301512L (en) * 1993-05-03 1994-11-04 Fibertech Ab Wipe and wipe when drying paper

Also Published As

Publication number Publication date
DE102005057638A1 (en) 2007-06-06
WO2007062926A1 (en) 2007-06-07
CN101321911B (en) 2012-11-07
ATE437266T1 (en) 2009-08-15
EP1960594A1 (en) 2008-08-27
CN101321911A (en) 2008-12-10
DE502006004341D1 (en) 2009-09-03

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