EP1908877B1 - Drying assembly and method for threading a web - Google Patents

Drying assembly and method for threading a web Download PDF

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Publication number
EP1908877B1
EP1908877B1 EP07111928A EP07111928A EP1908877B1 EP 1908877 B1 EP1908877 B1 EP 1908877B1 EP 07111928 A EP07111928 A EP 07111928A EP 07111928 A EP07111928 A EP 07111928A EP 1908877 B1 EP1908877 B1 EP 1908877B1
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EP
European Patent Office
Prior art keywords
transfer
strip
drying
sensor
drying assembly
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EP07111928A
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German (de)
French (fr)
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EP1908877A1 (en
Inventor
Peter Kahl
Werner Goebel
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1908877A1 publication Critical patent/EP1908877A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/04—Paper-break control devices

Definitions

  • the invention relates to a drying arrangement of a machine for producing and / or finishing a paper, board, tissue or another fibrous web, in which the fibrous web is guided for drying over heated drying cylinders and guide rolls, wherein the drying arrangement comprises a plurality of strip sensors for detecting a transfer strip the fibrous web, a plurality of transfer aids for guiding the transfer strip and a plurality of separating devices for separating the transfer strip has.
  • the invention also relates to methods for transferring a transfer strip of a paper, board, tissue or another fibrous web through the drying arrangement of a machine for producing and / or finishing the fibrous web, in which the fibrous web is guided for drying over heated drying cylinders and guide rolls, wherein the drying arrangement may have a plurality of strip sensors for detecting the transfer strip and has a plurality of transfer means for guiding the transfer strip and a plurality of separating means for separating the transfer strip
  • the document EP 1 057 932 A2 discloses a drying section of a paper machine comprising a drying cylinder.
  • the drying cylinders are arranged in two superimposed rows.
  • the paper web to be dried meanders through the dryer section and alternately comes into contact with the upper and lower drying cylinders and is pressed against them with drying screens.
  • blowing slabs are arranged on each drying cylinder in the region of the transfer strip position Scrape off the drying cylinder surface and convey it to the next drying cylinder using blown air.
  • Each scraper is equipped with a sensor for the transfer strip.
  • the sensor and the air supply system are coupled to a control unit. As soon as a sensor detects the transfer strip during the transfer process, the air supply of some of the following blow doctor blades is activated and that of the preceding blow doctor disabled.
  • the document WO2007 / 023209 A1 describes an arrangement for transferring a transfer strip in a single-row drying section of a paper machine with successive drying groups.
  • Blow dryers are provided on the drying cylinders.
  • the blowing blades of a drying group are supplied with blowing air independently of the other drying groups and activated at different times. As soon as the transfer strip is detected in a preceding drying group, the blowing air for the blowing doctor is activated in the following drying group.
  • the device comprises a separating device for separating the transfer strip and a performing device for carrying out the generated strip beginning on the subsequent structural unit.
  • a pivotable guide plate is provided in the region of the preceding unit. Between the guide plate and Auffuel issued arranged at a distance from the preceding assembly blast table is provided, which is associated with a device for generating at least one direction of the Aufkind recognized directed air jet.
  • the insertion of the fibrous web into the machine is usually carried out by means of at least one transfer strip, which is separated from the fibrous web and then passed through subsequent guide and / or treatment sections.
  • the object of the invention is therefore to make the transfer of the fibrous web safer and faster with the least possible effort and a manual
  • the drying arrangement comprises a plurality of successive transfer sections, which at least each associated with a strip sensor, a transfer auxiliary device and a separator, wherein the separator immediately follows the strip sensor, the strip sensors, the transfer auxiliary devices and the separating devices connected to a control device and the strip sensor of a transfer unit on detection of a disturbance of the transfer operation via the control means activates the separator of the upstream transfer unit.
  • the additional effort is limited due to the at least similar, preferably the same construction of the transfer units.
  • the transfer assist devices are preferably formed by transfer belts and / or blowing nozzles.
  • the transfer belts which follow in sections, guide the transfer strip directly over a certain distance and are usually activated only when required.
  • Blow nozzles are predominantly oriented in and / or counter to the direction of web travel and thus stabilize the run of the transfer strip. Since this much compressed air is needed, it is advantageous to reduce energy only the absolutely necessary Koch Kunststoffanges promoteden to activate.
  • the stripe sensor should activate the Koch Kunststoffs owned the current transfer unit after the detection of the transfer strip via the control device.
  • the others that follow are preferably inactive.
  • the strip sensor can in a known manner by an optical sensor, a thermal sensor, a pressure sensor, or the like. be formed.
  • Pressure sensors are advantageously used in suction devices which are intended to suck in the transfer strip. Missing the transfer strip so the vacuum in the suction device because of the uncovered area is considerably less than existing Koch Kunststoffstsammlung.
  • Separating devices can be advantageously formed by a blowpipe, which extends transversely to the web running direction and directed via a plurality of nozzles on activation of blowing air to the transfer strip.
  • the drying arrangement should have several drying groups.
  • drying cylinders are arranged below the fibrous web, as so impurities, web remnants or the web itself can be easily removed into the machine cellar.
  • the invention is also applicable to drying arrangements with one or several dryer groups of different construction, for example with two rows of drying cylinders.
  • the transfer units are each formed by a drying group or a drying group comprises several transfer units.
  • the drying arrangement comprises a plurality of successive transfer sections to which at least one strip sensor, a transfer auxiliary device and a separating device are assigned, wherein the separating device directly follows the strip sensor, the strip sensors, the transfer assist devices and the separating devices are connected to a control device and the strip sensor of a transfer unit upon detection of a disturbance of the transfer strip via the control means activates the separator of the upstream transfer unit and starts the repetition of the transfer operation in the upstream transfer unit.
  • a transfer strip can be done in particular in narrow fibrous webs also a web-wide transfer.
  • the transfer process is identical, only the widening omitted.
  • the drying arrangement comprises a plurality of successive Students confusee, which at least one each Engineer.s featured and a separation device is assigned, wherein the KochAvems featureden and the separation means are connected to a control device and activated upon detection of a disturbance of the transfer strip in a transfer unit via the control device, the separator of the upstream transfer unit and the repetition of the transfer operation is started in the upstream transfer unit.
  • the strip monitoring is carried out by the operating personnel. Upon detection of a fault in a transfer unit, the operator can activate the separator of the upstream transfer unit via the control device via a switch and thus restart the transfer process from there.
  • the drying arrangement has several drying groups, in which the fibrous web 1 is supported by the dryer fabric 2 of the respective drying group, meandering alternately over heated drying cylinders 3 and 4 suctioned guide rolls.
  • the drying cylinder 2 presses the fibrous web 1 against the hot surface of the drying cylinder 3 and thus favors the heat transfer to Fibrous web 1.
  • the drying group comprises a plurality of transfer units 11, 12 which are arranged one behind the other and which each begin with a strip sensor 7 and an immediately following separating device 8.
  • the strip sensor 7 is exemplified as an optical sensor which checks the presence of the transfer strip during the wrapping of the first guide roller 4 of the transfer unit.
  • Recognizability is significantly increased if the running during the wrapping of the guide roller 4 between this and the transfer strip drying wire 2 is made very dark.
  • the separating device 8 is formed by a blow pipe extending transversely to the web running direction in the region between the first guide roll 4 and the following drying cylinder 3 of the transfer unit 11, 12.
  • the nozzles of the blower tube direct compressed air to the transfer strip.
  • the drying cylinders 3 scraper 5 are assigned, which also carry a transfer aid 6 at the same time.
  • transfer assist devices 6 are each formed by a blowing nozzle aligned in and opposite to the running direction, the compressed air of which considerably improves the running of the fibrous web 1 or of the transfer strip.
  • the activation takes place, ie the compressed air control of the blowing nozzles via valves 9.
  • the strip sensors 7, the separating devices 8 and the transfer assist devices 6 or the associated control elements 9 are connected to a central control device 10.
  • the transfer assist devices 6 of this section are activated, so that the transfer strip easily passes through the transfer unit 11,12.
  • the transfer assist devices 6 of a possibly existing transfer unit 11, 12 are deactivated. This compressed air shutdown significantly reduces the energy requirement without affecting the run of the already transferred strip.
  • the control device 10 concludes that the transfer operation between these two strip sensors 7 has been disrupted.
  • control device 10 activates the separating device 8, which follows the first of these two strip sensors 7 in the web running direction, which leads to the separation of the transfer strip immediately after the strip sensor 7, which has last correctly detected the transfer strip.
  • This repetition of the transfer process in a transfer unit 11, 12 can be repeated several times. After reaching a predetermined maximum number of
  • control device 10 automatically detects a fault in the transfer process, interrupts it at a predetermined location and automatically restarts the transfer from there. This considerably speeds up the transfer process.

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  • Paper (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Successive transfer sections (11, 12) include a strip sensor (7), a transfer aid (6) and a separator (8). The separator directly follows the strip sensor. Strip sensors, transfer aids and separators are connected to a controller (10). On detecting a fault in the transfer operation, the strip sensor of a transfer unit (11, 12) activates the separator of the previous transfer unit, via the controller. When the transfer strip is detected, the sensor deactivates the transfer aid device of the previous unit, via the controller. Once the transfer strip has been detected, the sensor activates the transfer aid of the current transfer unit. The sensor is optical, detects pressure or heat. The transfer aids are air-blowing nozzles or transfer belts. The separator unit is a blast pipe. Several drying sections are so equipped. The fibrous web (1) is led into the drying sections supported on a drying sieve belt (2). It meanders over the heated drying cylinders (3) and guide rollers (4). Each transfer unit (11, 12) comprises a drying section. Alternatively, one drying section comprises several transfer units. An independent claim IS INCLUDED FOR the corresponding method of carrying the transfer strip of a web through the drying section.

Description

Die Erfindung betrifft eine Trocknungsanordnung einer Maschine zur Herstellung und/oder Veredlung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn, in der die Faserstoffbahn zur Trocknung über beheizte Trockenzylinder und Leitwalzen geführt wird, wobei die Trocknungsanordnung mehrere Streifensensoren zur Erfassung eines Überführstreifens der Faserstoffbahn, mehrere Überführhilfseinrichtungen zur Führung des Überführstreifens und mehrere Trenneinrichtungen zum Abtrennen des Überführstreifens besitzt.The invention relates to a drying arrangement of a machine for producing and / or finishing a paper, board, tissue or another fibrous web, in which the fibrous web is guided for drying over heated drying cylinders and guide rolls, wherein the drying arrangement comprises a plurality of strip sensors for detecting a transfer strip the fibrous web, a plurality of transfer aids for guiding the transfer strip and a plurality of separating devices for separating the transfer strip has.

Die Erfindung betrifft auch Verfahren zum Überführen eines Überführstreifens einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn durch die Trocknungsanordnung einer Maschine zur Herstellung und/oder Veredlung der Faserstoffbahn, in der die Faserstoffbahn zur Trocknung über beheizte Trockenzylinder und Leitwalzen geführt wird, wobei die Trocknungsanordnung mehrere Streifensensoren zur Erfassung des Überführstreifens haben kann und mehrere Überführhilfseinrichtungen zur Führung des Überführstreifens und mehrere Trenneinrichtungen zum Abtrennen des Überführstreifens besitztThe invention also relates to methods for transferring a transfer strip of a paper, board, tissue or another fibrous web through the drying arrangement of a machine for producing and / or finishing the fibrous web, in which the fibrous web is guided for drying over heated drying cylinders and guide rolls, wherein the drying arrangement may have a plurality of strip sensors for detecting the transfer strip and has a plurality of transfer means for guiding the transfer strip and a plurality of separating means for separating the transfer strip

Das Dokument EP 1 057 932 A2 offenbart eine Trockenzylinder umfassende Trockenpartie einer Papiermaschine. Die Trockenzylinder sind in zwei übereinanderliegenden Reihen angeordnet. Die zu trocknende Papierbahn durchläuft die Trockenpartie mäanderförmig wobei sie abwechselnd in Kontakt mit den oberen und unteren Trockenzylindern kommt und mit Trockensieben an diese gedrückt wird Für das Überführen des Überführstreifens sind an jedem Trockenzylinder im Bereich der Position des Überführstreifens Blasschaber angeordnet, die den Überführstreifen von der Trockenzylinderoberfläche abschaben und mittels Blasluft zum nächsten Trockenzylinder befördern. Jeder Blasschaber ist mit einem Sensor für den Überführstreifen ausgerüstet. Der Sensor und das Luftversorgungssystem sind mit einer Kontrolleinheit gekoppelt. Sobald ein Sensor während des Überführvorganges den Überführstreifen detektiert wird die Luftversorgung von einigen der nachfolgenden Blasschaber aktiviert und die der vorausgehenden Blasschaber deaktiviert.The document EP 1 057 932 A2 discloses a drying section of a paper machine comprising a drying cylinder. The drying cylinders are arranged in two superimposed rows. The paper web to be dried meanders through the dryer section and alternately comes into contact with the upper and lower drying cylinders and is pressed against them with drying screens. For the transfer of the transfer strip, blowing slabs are arranged on each drying cylinder in the region of the transfer strip position Scrape off the drying cylinder surface and convey it to the next drying cylinder using blown air. Each scraper is equipped with a sensor for the transfer strip. The sensor and the air supply system are coupled to a control unit. As soon as a sensor detects the transfer strip during the transfer process, the air supply of some of the following blow doctor blades is activated and that of the preceding blow doctor disabled.

Das Dokument WO2007/023209 A1 beschreibt eine Anordnung zum Überführen eines Überführstreifens in einer einreihigen Trockenpartie einer Papiermaschine mit aufeinanderfolgende Trockengruppen. An den Trockenzylindern sind Blasschaber vorgesehen. Die Blasschaber einer Trockengruppe werden unabhängig von den anderen Trockengruppen mit Blasluft versorgt und zu verschiedenen Zeiten aktiviert. Sobald der Überführstreifen in einer vorangehenden Trockengruppe detektiert wird wird die Blasluft für die Blasschaber in der nachfolgenden Trockengruppe aktiviert.The document WO2007 / 023209 A1 describes an arrangement for transferring a transfer strip in a single-row drying section of a paper machine with successive drying groups. Blow dryers are provided on the drying cylinders. The blowing blades of a drying group are supplied with blowing air independently of the other drying groups and activated at different times. As soon as the transfer strip is detected in a preceding drying group, the blowing air for the blowing doctor is activated in the following drying group.

Im Dokument DE 100 45 141 A1 ist eine Vorrichtung zum Überführen eines Streifens einer Papierbahn von einer vorangehenden zu einer nachfolgenden Baueinheit einer Papiermaschine beschrieben. Die Vorrichtung umfasst eine Trenneinrichtung zum Trennen des Überführstreifens und eine Aufführeinrichtung zum Ausführen des erzeugten Streifenanfangs auf die nachfolgende Baueinheit. Dabei ist im Bereich der vorangehenden Baueinheit eine schwenkbare Führungsplatte vorgesehen. Zwischen Führungsplatte und Aufführeinrichtung ist ein in einem Abstand von der vorangehenden Baueinheit angeordneter Blastisch vorgesehen, dem eine Einrichtung zur Erzeugung wenigstens eines zur Aufführeinrichtung hin gerichteten Luftstrahles zugeordnet ist.In the document DE 100 45 141 A1 An apparatus for transferring a strip of a paper web from a preceding to a subsequent unit of a paper machine is described. The device comprises a separating device for separating the transfer strip and a performing device for carrying out the generated strip beginning on the subsequent structural unit. In this case, a pivotable guide plate is provided in the region of the preceding unit. Between the guide plate and Aufführeinrichtung arranged at a distance from the preceding assembly blast table is provided, which is associated with a device for generating at least one direction of the Aufführeinrichtung directed air jet.

Das Einführen der Faserstoffbahn in die Maschine erfolgt üblicherweise vermittels wenigstens eines Überführstreifens, der von der Faserstoffbahn abgetrennt und dann durch nachfolgende Führungs- und/oder Behandlungsabschnitte geführt wird.The insertion of the fibrous web into the machine is usually carried out by means of at least one transfer strip, which is separated from the fibrous web and then passed through subsequent guide and / or treatment sections.

Sobald der Streifen stabil durch die Maschine läuft kann dann dessen Breite bis zur vollen Bahnbreite vergrößert werden.As soon as the strip runs stably through the machine, its width can then be increased up to the full width of the web.

Dieses Überführen der Faserstoffbahn ist relativ störanfällig und aufwendig.This transfer of the fibrous web is relatively susceptible to interference and consuming.

Die Aufgabe der Erfindung ist es daher, das Überführen der Faserstoffbahn mit möglichst geringem Aufwand sicherer und schneller zu machen und eine manuelleThe object of the invention is therefore to make the transfer of the fibrous web safer and faster with the least possible effort and a manual

Unterstützung des Überführvorgangs zu vermeiden.To avoid support of the transfer process.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass die Trocknungsanordnung mehrere aufeinander folgende Überführabschnitte umfasst, denen zumindest je einen Streifensensor, eine Überführhilfseinrichtung und eine Trenneinrichtung zugeordnet ist, wobei die Trenneinrichtung dem Streifensensor unmittelbar folgt, die Streifensensoren, die Überführhilfseinrichtungen und die Trenneinrichtungen mit einer Steuereinrichtung verbunden sind und der Streifensensor einer Überführeinheit bei Erkennung einer Störung des Überführvorgangs über die Steuereinrichtung die Trenneinrichtung der vorgelagerten Überführeinheit aktiviert.According to the invention, this object is achieved in that the drying arrangement comprises a plurality of successive transfer sections, which at least each associated with a strip sensor, a transfer auxiliary device and a separator, wherein the separator immediately follows the strip sensor, the strip sensors, the transfer auxiliary devices and the separating devices connected to a control device and the strip sensor of a transfer unit on detection of a disturbance of the transfer operation via the control means activates the separator of the upstream transfer unit.

Durch die Aufteilung in mehrere und damit kürzere Überführeinheiten kann die Steuerung und Überwachung des Überführvorganges wesentlich vereinfacht und damit sicherer gestaltet werden.By dividing into several and thus shorter transfer units, the control and monitoring of the transfer process can be substantially simplified and thus made safer.

Außerdem bleibt der zusätzliche Aufwand auf Grund des zumindest ähnlichen, vorzugsweise gleichen Aufbaus der Überführeinheiten begrenzt.In addition, the additional effort is limited due to the at least similar, preferably the same construction of the transfer units.

Dabei ist wesentlich, dass der Überführvorgang schrittweise über die Überführeinheiten erfolgt und bei einer Störung die Überführung vor der Störung unterbrochen und von dort aus wiederholt wird.It is essential that the transfer process takes place stepwise on the transfer units and in case of failure, the transfer is interrupted before the disturbance and repeated from there.

Dabei werden die Überführhilfseinrichtungen vorzugsweise von Überführbändern und/oder Blasdüsen gebildet. Die abschnittsweise mitlaufenden Überführbänder führen den Überführstreifen direkt über eine bestimmte Distanz und werden meist nur bei Bedarf zugeschaltet. Blasdüsen sind überwiegend in und/oder entgegen der Bahnlaufrichtung ausgerichtet und stabilisieren so den Lauf des Überführstreifens. Da hierbei viel Druckluft benötigt wird, ist es zur Energiesenkung vorteilhaft nur die unbedingt benötigten Überführhilfseinrichtungen zu aktivieren.In this case, the transfer assist devices are preferably formed by transfer belts and / or blowing nozzles. The transfer belts, which follow in sections, guide the transfer strip directly over a certain distance and are usually activated only when required. Blow nozzles are predominantly oriented in and / or counter to the direction of web travel and thus stabilize the run of the transfer strip. Since this much compressed air is needed, it is advantageous to reduce energy only the absolutely necessary Überführhilfseinrichtungen to activate.

Dies kann in vorteilhafter Weise dadurch erreicht werden, dass der Streifensensor bei Erkennung des Überführstreifens über die Steuereinrichtung die Überführhilfseinrichtung der vorgelagerten Überführeinheit deaktiviert und die nachfolgenden Überführeinrichtungen aktiviert.This can be achieved in an advantageous manner in that the strip sensor deactivates the Überführhilfseinrichtung the upstream transfer unit upon detection of the transfer strip via the control device and activates the subsequent transfer devices.

Damit sind alle dem betreffenden Streifensensor vorgelagerten Überführhilfseinrichtungen deaktiviert. Dies ist problemlos möglich, da der Überführstreifen bis zu diesem Streifensensor gelangt ist.Thus, all of the respective strip sensor upstream Überführhilfseinrichtungen are disabled. This is easily possible since the transfer strip has reached this strip sensor.

Außerdem sollte der Streifensensor nach erfolgter Erkennung des Überführstreifens über die Steuereinrichtung die Überführhilfseinrichtung der aktuellen Überführeinheit aktivieren. Die darüber hinaus folgenden sind vorzugsweise inaktiv.In addition, the stripe sensor should activate the Überführhilfseinrichtung the current transfer unit after the detection of the transfer strip via the control device. The others that follow are preferably inactive.

Der Streifensensor kann in bekannter Weise von einem optischen Sensor, einem thermischen Sensor, einem Drucksensor o.ä. gebildet werden.The strip sensor can in a known manner by an optical sensor, a thermal sensor, a pressure sensor, or the like. be formed.

Drucksensoren kommen mit Vorteil in Saugeinrichtungen zum Einsatz, die den Überführstreifen ansaugen sollen. Fehlt der Überführstreifen so ist das Vakuum in der Saugeinrichtung wegen der nicht abgedeckten Fläche erheblich geringer als bei vorhandenem Überführstreifen.Pressure sensors are advantageously used in suction devices which are intended to suck in the transfer strip. Missing the transfer strip so the vacuum in the suction device because of the uncovered area is considerably less than existing Überführstreifen.

Trenneinrichtungen können mit Vorteil von einem Blasrohr gebildet werden, welches quer zur Bahnlaufrichtung verläuft und über mehrere Düsen bei Aktivierung Blasluft auf den Überführstreifen richtet.Separating devices can be advantageously formed by a blowpipe, which extends transversely to the web running direction and directed via a plurality of nozzles on activation of blowing air to the transfer strip.

Wegen der Länge der Trocknungsanordnungen und zum Ausgleich von Dehnungen der Faserstoffbahn sollte die Trocknungsanordnung mehrere Trockengruppen besitzen.Because of the length of the drying arrangements and to compensate for strains of the fibrous web, the drying arrangement should have several drying groups.

Besonders einfach gestalten sich diese, wenn die Faserstoffbahn in den Trockengruppen von je einem Trockensieb gestützt, mäanderförmig über beheizte Trockenzylinder und Leitwalzen geführt wird. Dabei ist es vorteilhaft, wenn die Trockenzylinder unter der Faserstoffbahn angeordnet sind, da so Verunreinigungen, Bahnreste oder die Bahn selbst einfach in den Maschinenkeller abgeführt werden können.These are particularly simple when the fibrous web is supported in the dryer groups by a respective drying wire, meandering over heated drying cylinders and guide rolls is performed. It is advantageous if the drying cylinders are arranged below the fibrous web, as so impurities, web remnants or the web itself can be easily removed into the machine cellar.

Anwendbar ist die Erfindung jedoch auch bei Trocknungsanordnungen mit einer oder mehreren Trockengruppen anderer Konstruktion, beispielsweise mit zwei Reihen von Trockenzylindern.However, the invention is also applicable to drying arrangements with one or several dryer groups of different construction, for example with two rows of drying cylinders.

Je nach Länge der Trockengruppe kann es vorteilhaft sein, wenn die Überführeinheiten von je einer Trockengruppe gebildet werden oder aber eine Trockengruppe mehrere Überführeinheiten umfasst.Depending on the length of the drying group, it may be advantageous if the transfer units are each formed by a drying group or a drying group comprises several transfer units.

Hinsichtlich eines Verfahrens ist wesentlich, dass die Trocknungsanordnung mehrere aufeinander folgende Überführabschnitte umfasst, denen zumindest je ein Streifensensor, eine Überführhilfseinrichtung und eine Trenneinrichtung zugeordnet ist, wobei die Trenneinrichtung dem Streifensensor unmittelbar folgt, die Streifensensoren, die Überführhilfseinrichtungen und die Trenneinrichtungen mit einer Steuereinrichtung verbunden sind und der Streifensensor einer Überführeinheit bei Erkennung einer Störung des Überführstreifens über die Steuereinrichtung die Trenneinrichtung der vorgelagerten Überführeinheit aktiviert und die Wiederholung des Überführvorganges in der vorgelagerten Überführeinheit startet.With regard to a method, it is essential that the drying arrangement comprises a plurality of successive transfer sections to which at least one strip sensor, a transfer auxiliary device and a separating device are assigned, wherein the separating device directly follows the strip sensor, the strip sensors, the transfer assist devices and the separating devices are connected to a control device and the strip sensor of a transfer unit upon detection of a disturbance of the transfer strip via the control means activates the separator of the upstream transfer unit and starts the repetition of the transfer operation in the upstream transfer unit.

Dabei ist es von Vorteil, wenn die Zeitspanne, die der Überführstreifen von einem Streifensensor bis zum Streifensensor der folgenden Überführeinheit benötigt, überwacht wird und beim Überschreiten einer vorgegebenen Zeitspanne auf eine Störung des Überführvorganges zwischen diesen Streifensensoren geschlossen wird. Diese Art der Störungsüberwachung ist sehr einfach und sicher.It is advantageous if the time required for the transfer strip from a strip sensor to the strip sensor of the following transfer unit, is monitored and is closed when exceeding a predetermined period of time to a fault in the transfer process between these strip sensors. This type of fault monitoring is very simple and safe.

Statt eines Überführstreifens kann insbesondere bei schmalen Faserstoffbahnen auch eine bahnbreite Überführung erfolgen. Dabei ist der Überführvorgang identisch, lediglich das Breitfahren entfällt.Instead of a transfer strip can be done in particular in narrow fibrous webs also a web-wide transfer. The transfer process is identical, only the widening omitted.

Um den Steuerungsaufwand zu minimieren kann auch ein halbautomatisches Überführverfahren von Vorteil sein.In order to minimize the control effort, a semi-automatic transfer method can also be advantageous.

Dabei ist wesentlich, dass die Trocknungsanordnung mehrere aufeinander folgende Überführabschnitte umfasst, denen zumindest je eine Überführhilfseinrichtung und eine Trenneinrichtung zugeordnet ist, wobei die Überführhilfseinrichtungen und die Trenneinrichtungen mit einer Steuereinrichtung verbunden sind und bei Erkennung einer Störung des Überführstreifens in einer Überführeinheit über die Steuereinrichtung die Trenneinrichtung der vorgelagerten Überführeinheit aktiviert und die Wiederholung des Überführvorganges in der vorgelagerten Überführeinheit gestartet wird.It is essential that the drying arrangement comprises a plurality of successive Überführabschnitte, which at least one each Überführhilfseinrichtung and a separation device is assigned, wherein the Überführhilfseinrichtungen and the separation means are connected to a control device and activated upon detection of a disturbance of the transfer strip in a transfer unit via the control device, the separator of the upstream transfer unit and the repetition of the transfer operation is started in the upstream transfer unit.

Die Streifenüberwachung wird hierbei vom Bedienpersonal übernommen. Bei Erkennen einer Störung in einer Überführeinheit kann der Bediener über einen Schalter die Trenneinrichtung der vorgelagerten Überführeinheit über die Steuereinrichtung aktivieren und so den Überführvorgang von dort aus neu starten.The strip monitoring is carried out by the operating personnel. Upon detection of a fault in a transfer unit, the operator can activate the separator of the upstream transfer unit via the control device via a switch and thus restart the transfer process from there.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur einen schematischen Querschnitt durch einen Abschnitt der Trocknungsanordnung.The invention will be explained in more detail with reference to an exemplary embodiment. In the accompanying drawing, the figure shows a schematic cross section through a portion of the drying arrangement.

Die Trocknungsanordnung besitzt mehrere Trockengruppen, in denen die Faserstoffbahn 1 vom Trockensieb 2 der jeweiligen Trockengruppe gestützt, mäanderförmig abwechselnd über beheizte Trockenzylinder 3 und besaugte Leitwalzen 4 geführt wird.The drying arrangement has several drying groups, in which the fibrous web 1 is supported by the dryer fabric 2 of the respective drying group, meandering alternately over heated drying cylinders 3 and 4 suctioned guide rolls.

Dabei befinden sich die Trockenzylinder 3 in einer oberen Reihe unter der Faserstoffbahn 1 und die Leitwalzen 4 in einer unteren Reihe der Trockengruppen über der Faserstoffbahn 1. Das luftdurchlässige Trockensieb 2 drückt die Faserstoffbahn 1 gegen die heiße Mantelfläche der Trockenzylinder 3 und begünstigt so den Wärmetransport zur Faserstoffbahn 1.The drying cylinder 2 presses the fibrous web 1 against the hot surface of the drying cylinder 3 and thus favors the heat transfer to Fibrous web 1.

Die Trockengruppe umfasst mehrere hintereinander angeordnete Überführeinheiten 11,12, die jeweils mit Streifensensor 7 und einer unmittelbar darauf folgenden Trenneinrichtung 8 beginnen.The drying group comprises a plurality of transfer units 11, 12 which are arranged one behind the other and which each begin with a strip sensor 7 and an immediately following separating device 8.

Zum Überführen wird ein schmaler Überführstreifen der Faserstoffbahn 1 auf derFor transferring a narrow transfer strip of the fibrous web 1 on the

Führerseite durch die Trocknungsanordnung geführt. Nach erfolgreicher Überführung erfolgt anschließend das Breitfahren des Überführstreifens bis zur vollen Bahnbreite.Guide page led by the drying arrangement. After successful transfer then carried out the spreading of the transfer strip to the full web width.

Dabei ist der Streifensensor 7 beispielhaft als optischer Sensor ausgebildet, der das Vorhandensein des Überführstreifens während der Umschlingung der ersten Leitwalze 4 der Überführeinheit prüft.In this case, the strip sensor 7 is exemplified as an optical sensor which checks the presence of the transfer strip during the wrapping of the first guide roller 4 of the transfer unit.

Die Erkennbarkeit wird erheblich gesteigert, wenn das während der Umschlingung der Leitwalze 4 zwischen dieser und dem Überführstreifen laufende Trockensieb 2 sehr dunkel ausgeführt ist.Recognizability is significantly increased if the running during the wrapping of the guide roller 4 between this and the transfer strip drying wire 2 is made very dark.

Die Trenneinrichtung 8 wird von einem quer zur Bahnlaufrichtung verlaufenden Blasrohr im Bereich zwischen der ersten Leitwalze 4 und dem folgenden Trockenzylinder 3 der Überführeinheit 11,12 gebildet. Dabei richten die Düsen des Blasrohres zur Trennung Druckluft auf den Überführstreifen.The separating device 8 is formed by a blow pipe extending transversely to the web running direction in the region between the first guide roll 4 and the following drying cylinder 3 of the transfer unit 11, 12. The nozzles of the blower tube direct compressed air to the transfer strip.

Während der abgetrennte Teil des Überführstreifens in den Maschinenkeller geführt wird, kann der neue Anfang des Überführstreifens erneut durch den folgenden Teil der Maschine geführt werden.While the severed part of the transfer strip is fed into the machine cellar, the new beginning of the transfer strip can be redirected through the following part of the machine.

Um die Trockenzylinder 3 von Verunreinigungen zu reinigen und dem Mitlaufen der Faserstoffbahn 1 oder Teilen davon entgegenzuwirken, sind den Trockenzylindern 3 Schaber 5 zugeordnet, die gleichzeitig auch jeweils eine Überführhilfseinrichtung 6 tragen.In order to clean the drying cylinder 3 of impurities and to counteract the running of the fibrous web 1 or parts thereof, the drying cylinders 3 scraper 5 are assigned, which also carry a transfer aid 6 at the same time.

Diese Überführhilfseinrichtungen 6 werden von je einer in und einer entgegen der Bahnlaufrichtung ausgerichteten Blasdüse gebildet, deren Druckluft den Lauf der Faserstoffbahn 1 bzw. des Überführstreifens erheblich verbessert.These transfer assist devices 6 are each formed by a blowing nozzle aligned in and opposite to the running direction, the compressed air of which considerably improves the running of the fibrous web 1 or of the transfer strip.

Dabei erfolgt die Aktivierung, d.h. die Druckluftsteuerung der Blasdüsen über Ventile 9.The activation takes place, ie the compressed air control of the blowing nozzles via valves 9.

Die Streifensensoren 7, die Trenneinrichtungen 8 und die Überführhilfseinrichtungen 6 bzw. die dazugehörigen Steuerelemente 9 sind mit einer zentralen Steuereinrichtung 10 verbunden.The strip sensors 7, the separating devices 8 and the transfer assist devices 6 or the associated control elements 9 are connected to a central control device 10.

Gelangt nun der Anfang eines Überführstreifens zur ersten Leitwalze 4 der entsprechenden Überführeinheit 11,12, so werden die Überführhilfseinrichtungen 6 dieses Abschnittes aktiviert, so dass der Überführstreifen problemlos durch die Überführeinheit 11,12 gelangt. Gleichzeitig werden die Überführhilfseinrichtungen 6 einer eventuell davor vorhandenen Überführeinheit 11,12 deaktiviert. Diese Druckluftabschaltung vermindert den Energiebedarf erheblich, ohne den Lauf des bereits überführten Streifens zu beeinträchtigen.If now the beginning of a transfer strip to the first guide roller 4 of the corresponding transfer unit 11,12, the transfer assist devices 6 of this section are activated, so that the transfer strip easily passes through the transfer unit 11,12. At the same time, the transfer assist devices 6 of a possibly existing transfer unit 11, 12 are deactivated. This compressed air shutdown significantly reduces the energy requirement without affecting the run of the already transferred strip.

Der Vorgang wiederholt sich analog, wenn der Anfang des Überführstreifens den Streifensensor 7 der folgenden Überführeinheit 11,12 erreicht.The process is repeated analogously when the beginning of the transfer strip reaches the strip sensor 7 of the following transfer unit 11,12.

Gelangt der Anfang des Überführstreifens innerhalb einer vorgegebenen Zeitspanne nicht bis zum Streifensensor 7 der folgenden Überführeinheit 11,12, so schließt die Steuereinrichtung 10 daraus auf eine Störung des Überführvorganges zwischen diesen beiden Streifensensoren 7.If the beginning of the transfer strip does not reach the strip sensor 7 of the following transfer unit 11, 12 within a predetermined period of time, then the control device 10 concludes that the transfer operation between these two strip sensors 7 has been disrupted.

Infolgedessen aktiviert die Steuereinrichtung 10 die Trenneinrichtung 8, welche dem in Bahnlaufrichtung ersten dieser beiden Streifensensoren 7 folgt, was zur Abtrennung des Überführstreifens unmittelbar nach dem Streifensensor 7 führt, der den Überführstreifen zuletzt korrekt erfasst hat.As a result, the control device 10 activates the separating device 8, which follows the first of these two strip sensors 7 in the web running direction, which leads to the separation of the transfer strip immediately after the strip sensor 7, which has last correctly detected the transfer strip.

Während der abgetrennte Teil des Überführstreifens im Maschinenkeller aufgefangen wird, kann das neue Ende des Überführstreifens erneut durch die Überführeinheit 11,12 geführt werden, was durch die noch aktiven Überführhilfseinrichtungen 6 unterstützt wird.While the severed part of the transfer strip is caught in the machine cellar, the new end of the transfer strip can again be guided by the transfer unit 11,12, which is supported by the still active transfer assist devices 6.

Diese Wiederholung des Überführvorganges in einer Überführeinheit 11,12 kann mehrfach wiederholt werden. Nach Erreichen einer vorgegebenen Maximalanzahl vonThis repetition of the transfer process in a transfer unit 11, 12 can be repeated several times. After reaching a predetermined maximum number of

Wiederholungen sollte jedoch der Überführvorgang gestoppt und eine intensive Prüfung vorgenommen werden.Repetitions, however, the transfer process should be stopped and an intensive check should be made.

Im Ergebnis erkennt die Steuereinrichtung 10 selbständig eine Störung im Überführvorgang, unterbricht diesen an einer vorgegebenen Stelle und startet die Überführung von dort automatisch neu. Hierdurch wird der Überführvorgang erheblich beschleunigt.As a result, the control device 10 automatically detects a fault in the transfer process, interrupts it at a predetermined location and automatically restarts the transfer from there. This considerably speeds up the transfer process.

Claims (18)

  1. Drying assembly of a machine for producing and/or finishing a paper, board, tissue or other fibrous web (1), in which the fibrous web (1) to be dried is led over heated drying cylinders (3) and guide rolls (4), the drying assembly having a plurality of strip sensors (7) for detecting a transfer strip of the fibrous web (1), a plurality of transfer aids (6) for guiding the transfer strip and a plurality of severing devices (8) for severing the transfer strip, characterized in that the drying assembly comprises a plurality of successive transfer units (11, 12), to each of which at least one strip sensor (7), a transfer aid (6) and a severing device (8) are assigned, the severing device (8) following the strip sensor (7) directly, the strip sensors (7), the transfer aids (6) and the severing devices (8) being connected to a control device (10) and, when a disruption to the transfer operation is detected, the strip sensor (7) of a transfer unit (11, 12) activating the severing device (8) of the previous transfer unit (11, 12) via the control device (10).
  2. Drying assembly according to Claim 1, characterized in that
    when the transfer strip is detected, the strip sensor (7) deactivates the transfer aid (6) of the previous transfer unit (11, 12) via the control device (10).
  3. Drying assembly according to Claim 1 or 2, characterized in that
    after the transfer strip has been detected, the strip sensor (7) activates the transfer aid (6) of the current transfer unit (11, 12) via the control device (10).
  4. Drying assembly according to one of the preceding claims, characterized in that
    the strip sensor (7) is formed by an optical sensor.
  5. Drying assembly according to one of the preceding claims, characterized in that
    the strip sensor (7) is formed by a pressure sensor.
  6. Drying assembly according to one of the preceding claims, characterized in that
    the strip sensor (7) is formed by a thermal sensor.
  7. Drying assembly according to one of the preceding claims, characterized in that
    the transfer aids (6) are formed by blower nozzles.
  8. Drying assembly according to one of the preceding claims, characterized in that
    the transfer aids (6) are formed by transfer belts.
  9. Drying assembly according to one of the preceding claims, characterized in that
    the severing device (8) is formed by a blower pipe.
  10. Drying assembly according to one of the preceding claims, characterized in that
    this comprises a plurality of drying groups.
  11. Drying assembly according to Claim 10, characterized in that
    the fibrous web (1) is supported in the drying groups by a drying fabric (2) in each case led in serpentine fashion over heated drying cylinders (3) and guide rolls (4).
  12. Drying assembly according to Claim 10 or 11, characterized in that
    the transfer units (11, 12) are each formed by a drying group.
  13. Drying assembly according to Claim 10 or 11, characterized in that
    a drying group comprises a plurality of transfer units (11, 12).
  14. Method for transferring a transfer strip of paper, board, tissue or other fibrous web (1) through the drying assembly of a machine for producing and/or finishing the fibrous web (1), in which the fibrous web (1) to be dried is led over heated drying cylinders (3) and guide rolls (4), the drying assembly having a plurality of strip sensors (7) for detecting the transfer strip, a plurality of transfer aids (6) for guiding the transfer strip and a plurality of severing devices (8) for severing the transfer strip, in particular according to one of the preceding claims, characterized in that
    the drying assembly comprises a plurality of successive transfer units (11, 12), to each of which at least one strip sensor (7), a transfer aid (6) and a severing device (8) are assigned, the severing device (8) following the strip sensor (7) directly, the strip sensors (7), the transfer aids (6) and the severing devices (8) being connected to a control device (10) and, when a disruption to the transfer operation is detected, the strip sensor (7) of a transfer unit (11, 12) activating the severing device (8) of the previous transfer unit (11, 12) via the control device (10) and starting the repetition of the transfer operation in the previous transfer unit (11, 12).
  15. Method according to Claim 14, characterized in that
    the time interval needed by the transfer strip from one strip sensor (7) as far as the strip sensor (7) of the following transfer unit (11, 12) is monitored and, when a predefined time interval is exceeded, it is concluded that there is disruption to the transfer operation between these strip sensors (7).
  16. Method according to Claim 14 or 15, characterized in that
    when the transfer strip is detected, the strip sensor (7) deactivates the transfer aid (6) of the previous transfer unit (11, 12) via the control device (10).
  17. Method according to one of Claims 14 to 16, characterized in that
    after the transfer strip has been detected, the strip sensor (7) activates the transfer aid (6) of the current transfer unit (11, 12) via the control device (10).
  18. Method for transferring a transfer strip of a paper, board, tissue or other fibrous web (1) through the drying assembly of a machine for producing and/or finishing the fibrous web (1), in which the fibrous web (1) to be dried is led over heated drying cylinders (3) and guide rolls (4), the drying assembly having a plurality of transfer aids (6) for guiding the transfer strip and a plurality of severing devices (8) for severing the transfer strip, characterized in that the drying assembly comprises a plurality of successive transfer units (11, 12), to each of which at least one transfer aid (6) and a severing device (8) are assigned, the transfer aids (6) and the severing devices (8) being connected to a control device (10) and, when a disruption to the transfer operation in a transfer unit (11, 12) is detected by the operating personnel, the severing device (8) of the previous transfer unit (11, 12) being activated via the control device (10) and the repetition of the transfer operation in the previous transfer unit (11, 12) being started.
EP07111928A 2006-10-05 2007-07-06 Drying assembly and method for threading a web Not-in-force EP1908877B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006047487A DE102006047487A1 (en) 2006-10-05 2006-10-05 dryer assembly

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EP1908877A1 EP1908877A1 (en) 2008-04-09
EP1908877B1 true EP1908877B1 (en) 2011-06-01

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CN (1) CN101187525B (en)
AT (1) ATE511573T1 (en)
DE (1) DE102006047487A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011087094A1 (en) * 2011-11-25 2013-05-29 Voith Patent Gmbh Method for transferring a material web from a drying arrangement to a downstream functional unit and drying device
CN102817270A (en) * 2012-08-24 2012-12-12 玖龙纸业（太仓）有限公司 Automatic paper breakage and cylinder blockage prevention device for drying part of paper making machine
FI11897U1 (en) * 2017-11-16 2017-12-18 Valmet Technologies Oy Tip pulling device for a pulp machine
CN113878669A (en) * 2021-09-24 2022-01-04 浙江哲丰新材料有限公司 Paper breaking and blowing device for papermaking

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5553391A (en) * 1995-06-05 1996-09-10 Bakalar; Sharon F. Method and apparatus for heat treating webs
US5535527A (en) * 1995-06-07 1996-07-16 Valmet Corporation Method and arrangement in a multi-cylinder dryer of a paper machine
DE19632988C1 (en) * 1996-08-15 1998-01-22 Stora Publication Paper Ag Process for eliminating paper defects in continuous paper production
US6193845B1 (en) * 1999-05-26 2001-02-27 Voith Sulzer Paper Technology North America Inc. Blow pipe tail threading system for paper-making machines
DE10045141A1 (en) * 2000-09-13 2002-03-21 Voith Paper Patent Gmbh Mechanism to transfer the leader strip of a paper/cardboard web, between stations, has a swing guide plate and a blower plate with a cutter each with blowers to direct the leading end of the strip into a cable feed nip
FI122337B (en) * 2005-08-25 2011-12-15 Metso Paper Inc Method and apparatus for tip drawing in the dryer section of a web forming machine

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EP1908877A1 (en) 2008-04-09
CN101187525A (en) 2008-05-28
ATE511573T1 (en) 2011-06-15
CN101187525B (en) 2011-07-06

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