EP0819792B1 - Method for guiding a running paper web or at least the leader cut from that web - Google Patents

Method for guiding a running paper web or at least the leader cut from that web Download PDF

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Publication number
EP0819792B1
EP0819792B1 EP97110968A EP97110968A EP0819792B1 EP 0819792 B1 EP0819792 B1 EP 0819792B1 EP 97110968 A EP97110968 A EP 97110968A EP 97110968 A EP97110968 A EP 97110968A EP 0819792 B1 EP0819792 B1 EP 0819792B1
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EP
European Patent Office
Prior art keywords
microprocessor
paper
paper web
web
guiding
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Expired - Lifetime
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EP97110968A
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German (de)
French (fr)
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EP0819792A1 (en
Inventor
Thomas Dipl.-Ing. Hermsen
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Voith Sulzer Finishing GmbH
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Voith Sulzer Finishing GmbH
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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

Definitions

  • the invention relates to a method for guiding a running paper web or at least one paper web strip cut from this from one treatment station to the next in a paper manufacturing or processing process using at least one pneumatically assisted Device, wherein the air pressure required in the device depending on the paper quality used in each case is set.
  • Pneumatically assisted devices are known for example from EP 0 232 689 A2 or from AU-B-509 349. As a general rule you can use these pneumatically assisted devices to run a running paper web or at least a paper web strip cut from this distinguish in compressed air control devices that Build up an air cushion over the nozzles and guide means which led the paper web or a paper web strip is, and suction and transport devices, which means the generation of a vacuum, the paper web or one Paper web strips on a perforated moving Suck in endless carrier tape and continue in this way.
  • a paper web must travel at high speed from the last cylinder of a drying cylinder group to the nip of a calender.
  • the running paper web behind the last drying cylinder about 20 - 40 cm cut wide strips and this over the known pneumatically assisted devices for Guiding a running paper web strip to the first nip.
  • the largest part of the paper web which is up to about 8 m wide may have returned to stock preparation.
  • the guidance of the strip is often very difficult to adjust the air pressure (be it overpressure for the nozzles or negative pressures on the perforated Support bands) connected.
  • the air pressure be it overpressure for the nozzles or negative pressures on the perforated Support bands
  • the pressures must be readjusted, which means a lot of effort and considerable Committee can lead because with the wide cutting the paper web has to be waited until the Strips neatly to the next treatment station was transferred.
  • the object of the invention is to provide a method with which the guidance of a paper web or at least one from this cut paper strip from one treatment station to the next more safely can.
  • the Paper web from a treatment station for example the drying cylinder
  • the next station e.g. a calender
  • pneumatically assisted guiding devices a running paper web or at least one this cut paper web strip used. It it often happens that paper qualities vary, i.e. for example, that both light and heavy papers to be produced. But it is also the case Parameters smoothness, porosity, stiffness and specific Weight of paper to be considered. In this In this case, the air pressures must be set accordingly until the strip is very successful high speed (up to 2000 m / min) from a first to a second treatment station.
  • the Invention is now based on the knowledge that the transfer process much safer and faster goes if one in a pneumatically assisted Device for guiding a running paper web or at least one paper web strip cut from this required air pressure depending on the paper quality used in each case via a microprocessor is set. This requires the data to the paper quality either via a control unit entered or fed via a measuring device become.
  • the microprocessor can be programmed Calculation steps or by means of empirically determined the values stored in a memory Specify the control unit pressure. It's from Advantage if the microprocessor directly controls the control unit controls at least one actuator for pressures. From the control unit, for example Pressure control valves or suction fans set be so that on the pneumatically assisted device for guiding a running paper web or at least one paper web strip cut from this the required pressure is present.
  • Such a pneumatic supported device for guiding a running Paper web or at least one cut from it Paper web strip can, for example, a compressed air guide or a suction and transport device his.
  • the microprocessor for determining the individual pressures on the pneumatic devices also supported web speed and the paper web train at the following Treatment station considered. These values will be in the usual process anyway determined and can the microprocessor EDP-like without difficulty Will be provided. Both paper web speed as well as paper web train don't have one big influence on the pressures needed, but they have an effect and can be disregarded possibly even a successful transfer of one Paper web strip from a treatment station to prevent next.
  • a paper web (1) is to be taken from a treatment station (15) transferred to a further treatment station (16) become.
  • the different facilities are to be understood, for example a drying cylinder, a nip a calender or a winder.
  • the treatment stations are only shown in the form of a box (15,16).
  • the pneumatic supported devices for guiding a running paper web or at least one of them cut paper web strips (2, 3) are sufficient known.
  • the device (2) shows a baffle (8), above which by means of an air nozzle (7) Air cushion is built, on which in turn the high-speed paper web (1) or a Stripes floats.
  • the nozzle (7) is from a compressed air source (13) supplied via a pressure control valve (12), which is controlled by the control unit (6) becomes.
  • a device (3) is shown that a perforated carrier tape running over rollers (10) (9). At least in a manner not shown one of the rollers driven. Located below the band there is a suction box (11) in which a vacuum is produced. The paper web or at least one out this cut paper web strip is thereby the tape is sucked in, held there and up to date Band transported on.
  • the negative pressure in A suction box (11) usually produces a fan (14).
  • This fan can be like the pressure control valve (12) of the first device (2) also via the Control unit (6) can be controlled to the required Set negative pressure, which in turn by the Microprocessor (4) is specified. Of course other actuators (12, 14) can also be used.
  • the values specified by the microprocessor (4) are for the most part on paper quality - and here mainly depending on the weight of the paper. Therefore, the operator of the system should use an operating unit (5) the microprocessor (4) the desired paper weight enter.
  • the microprocessor (4) determines then the pressures needed by formulating them calculated or as empirically determined and entered Fetches values from a memory and then returns them to the control unit (6).

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  • Advancing Webs (AREA)
  • Paper (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Führung einer laufenden Papierbahn oder zumindest eines aus dieser geschnittenen Papierbahnstreifens von einer Behandlungsstation zur nächsten in einem Papierherstellungs- oder Bearbeitungsprozeß unter Verwendung wenigstens einer pneumatisch unterstützten Vorrichtung, wobei der in der Vorrichtung benötigte Luftdruck in Abhängigkeit von der jeweils gefahrenen Papierqualität eingestellt wird.The invention relates to a method for guiding a running paper web or at least one paper web strip cut from this from one treatment station to the next in a paper manufacturing or processing process using at least one pneumatically assisted Device, wherein the air pressure required in the device depending on the paper quality used in each case is set.

Pneumatisch unterstützte Vorrichtungen sind beispielsweise aus der EP 0 232 689 A2 oder aus der AU-B-509 349 bekannt. Generell kann man diese pneumatisch unterstützten Vorrichtungen zur Führung einer laufenden Papierbahn oder zumindest eines aus dieser geschnittenen Papierbahnstreifens unterscheiden in Druckluftleiteinrichtungen, die über Düsen und Leitmittel ein Luftpolster aufbauen, auf dem die Papierbahn oder ein Papierbahnstreifen geführt wird, und Saug- und Transporteinrichtungen, die mittels der Erzeugung eines Unterdrucks die Papierbahn oder einen Papierbahnstreifen an ein perforiertes mitlaufendes endloses Tragband ansaugen und auf diese Art weiterführen.Pneumatically assisted devices are known for example from EP 0 232 689 A2 or from AU-B-509 349. As a general rule you can use these pneumatically assisted devices to run a running paper web or at least a paper web strip cut from this distinguish in compressed air control devices that Build up an air cushion over the nozzles and guide means which led the paper web or a paper web strip is, and suction and transport devices, which means the generation of a vacuum, the paper web or one Paper web strips on a perforated moving Suck in endless carrier tape and continue in this way.

Beispielsweise muß eine Papierbahn mit hoher Geschwindigkeit von dem letzten Zylinder einer Trockenzylindergruppe zu dem Walzenspalt eines Kalanders geführt werden. Zu diesem Zweck wird von der laufenden Papierbahn hinter dem letzten Trockenzylinder ein etwa 20 - 40 cm breiter Streifen abgeschnitten und dieser über die bekannten pneumatisch unterstützten Vorrichtungen zur Führung eines laufenden Papierbahnstreifens bis zu dem ersten Walzenspalt geführt. Währenddessen wird der weitgrößte Teil der Papierbahn, die bis etwa 8 m Breite haben kann, zur Stoffaufbereitung zurückgeführt. Erst wenn der Streifen die nächste Behandlungsstation im Papierherstellungsprozeß (in dem gewählten Beispiel also den Kalander) erfolgreich passiert hat, wird der Streifen durch Querverfahren der Schneidmesser allmählich breiter geschnitten, bis schlußendlich die gesamte Papierbahnbreite durch die nächste Behandlungsstation läuft.For example, a paper web must travel at high speed from the last cylinder of a drying cylinder group to the nip of a calender. For this purpose, the running paper web behind the last drying cylinder about 20 - 40 cm cut wide strips and this over the known pneumatically assisted devices for Guiding a running paper web strip to the first nip. Meanwhile, the the largest part of the paper web, which is up to about 8 m wide may have returned to stock preparation. First when the strip is the next treatment station in the papermaking process (So in the example chosen the calender) has successfully passed the strip by gradually moving the cutting knives cut wider until finally the entire width of the paper web through the next treatment station running.

Die Führung des Streifens ist oftmals mit großen Einstellschwierigkeiten der Luftdrücke (seien es Überdrükke für die Düsen oder Unterdrücke an den perforierten Tragbändern) verbunden. Insbesondere, wenn sich bei neuen Produkten die Papierqualität - und hier vornehmlich das Papiergewicht - oder die Papierbahngeschwindigkeit ändern, müssen die Drücke neu einjustiert werden, was einen großen Aufwand bedeutet und zu erheblichem Ausschuß führen kann, da mit dem Breitschneiden der Papierbahn so lange gewartet werden muß, bis der Streifen ordentlich bis zur nächsten Behandlungsstation überführt wurde. The guidance of the strip is often very difficult to adjust the air pressure (be it overpressure for the nozzles or negative pressures on the perforated Support bands) connected. Especially when it comes to new products the paper quality - and primarily here the paper weight - or the web speed change, the pressures must be readjusted, which means a lot of effort and considerable Committee can lead because with the wide cutting the paper web has to be waited until the Strips neatly to the next treatment station was transferred.

Aufgabe der Erfindung ist es, ein Verfahren anzugeben, mit dem die Führung einer Papierbahn oder zumindest eines aus dieser geschnittenen Papierbahnstreifens von einer Behandlungsstation zur nächsten sicherer erfolgen kann.The object of the invention is to provide a method with which the guidance of a paper web or at least one from this cut paper strip from one treatment station to the next more safely can.

Gelöst wird die Aufgabe durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale.The task is solved by the in the characteristic Part of claim 1 specified features.

Im Papierherstellungs- oder -bearbeitungsprozeß muß die Papierbahn von einer Behandlungsstation (beispielsweise dem genannten Trockenzylinder) zu der nächsten Station (beispielsweise einem Kalander) weitertransportiert werden. Dazu werden die aus den EP 0 232 689 A2 und AU-B-509 349 bekannten pneumatisch unterstützten Vorrichtungen zur Führung einer laufenden Papierbahn oder zumindest eines aus dieser geschnittenen Papierbahnstreifens verwendet. Es kommt häufig vor, daß Papierqualitäten variieren, d.h. beispielsweise, daß sowohl leichte als auch schwere Papiere produziert werden. Es sind aber durchaus auch die Parameter Glätte, Porosität, Steifigkeit und spezifisches Gewicht des Papiers zu berücksichtigen. In diesem Fall müssen die Luftdrücke so lange entsprechend eingestellt werden, bis es gelingt, den Streifen bei sehr hoher Geschwindigkeit (bis zu 2000 m/min) von einer ersten zu einer zweiten Behandlungsstation zu führen. Die Erfindung beruht nun auf der Erkenntnis, daß der Überführungsprozeß wesentlich sicherer und schneller vonstatten geht, wenn ein in einer pneumatisch unterstützten Vorrichtung zur Führung einer laufenden Papierbahn oder zumindest eines aus dieser geschnittenen Papierbahnstreifens benötigter Luftdruck in Abhängigkeit von der jeweils gefahrenen Papierqualität über einen Mikroprozessor eingestellt wird. Dazu müssen diesem die Daten zu der Papierqualität entweder über eine Bedieneinheit eingegeben oder über eine Meßeinrichtung zugeführt werden.In the paper manufacturing or processing process, the Paper web from a treatment station (for example the drying cylinder) to the next station (e.g. a calender) become. For this purpose, those known from EP 0 232 689 A2 and AU-B-509 349 pneumatically assisted guiding devices a running paper web or at least one this cut paper web strip used. It it often happens that paper qualities vary, i.e. for example, that both light and heavy papers to be produced. But it is also the case Parameters smoothness, porosity, stiffness and specific Weight of paper to be considered. In this In this case, the air pressures must be set accordingly until the strip is very successful high speed (up to 2000 m / min) from a first to a second treatment station. The Invention is now based on the knowledge that the transfer process much safer and faster goes if one in a pneumatically assisted Device for guiding a running paper web or at least one paper web strip cut from this required air pressure depending on the paper quality used in each case via a microprocessor is set. This requires the data to the paper quality either via a control unit entered or fed via a measuring device become.

Im folgenden kann der Mikroprozessor über einprogrammierte Berechnungsschritte oder mittels empirisch ermittelter, in einem Speicher abgelegter Werte den benötigten Druck der Steuerungseinheit vorgeben. Es ist von Vorteil, wenn der Mikroprozessor direkt die Steuerungseinheit wenigstens eines Stellorgans für Drücke ansteuert. Von der Steuerungseinheit können beispielsweise Druckregelventile oder Saugventilatoren eingestellt werden, so daß an der pneumatisch unterstützten Vorrichtung zur Führung einer laufenden Papierbahn oder zumindest eines aus dieser geschnittenen Papierbahnstreifens der benötigte Druck ansteht.In the following, the microprocessor can be programmed Calculation steps or by means of empirically determined the values stored in a memory Specify the control unit pressure. It's from Advantage if the microprocessor directly controls the control unit controls at least one actuator for pressures. From the control unit, for example Pressure control valves or suction fans set be so that on the pneumatically assisted device for guiding a running paper web or at least one paper web strip cut from this the required pressure is present.

Besonders vorteilhaft ist es für den Betreiber der Anlage, wenn er an einer Bedieneinheit des Mikroprozessors nur die gefahrene Papierqualität eingibt und anschließend im Mikroprozessor die benötigten Drücke an den einzelnen pneumatisch unterstützten Vorrichtungen automatisch ermittelt werden. Eine solche pneumatisch unterstützte Vorrichtung zur Führung einer laufenden Papierbahn oder zumindest eines aus dieser geschnittenen Papierbahnstreifens kann beispielsweise eine Druckluftleiteinrichtung oder eine Saug- und Transporteinrichtung sein.It is particularly advantageous for the operator of the system when connected to a control unit of the microprocessor only enters the paper quality used and then the required pressures in the microprocessor the individual pneumatically assisted devices can be determined automatically. Such a pneumatic supported device for guiding a running Paper web or at least one cut from it Paper web strip can, for example, a compressed air guide or a suction and transport device his.

Sinnvoll ist es in diesem Zusammenhang, als Papierqualität den Parameter Papiergewicht in die Bedieneinheit des Mikroprozessors einzugeben, da sich die Drücke in erster Linie nach dem Gewicht des Papiers richten.In this context it makes sense as paper quality the parameter paper weight in the control unit of the microprocessor because the pressures change primarily based on the weight of the paper.

Es ist jedoch auch vorteilhaft, wenn der Mikroprozessor für die Ermittlung der einzelnen Drücke an den pneumatisch unterstützten Vorrichtungen auch die Papierbahngeschwindigkeit und den Papierbahnzug an der folgenden Behandlungsstation berücksichtigt. Diese Werte werden im üblichen Prozeß sowieso laufend ermittelt und können dem Mikroprozessor EDV-mäßig ohne Schwierigkeiten zur Verfügung gestellt werden. Sowohl Papierbahngeschwindigkeit als auch Papierbahnzug haben zwar nicht so einen großen Einfluß auf die benötigten Drücke, aber sie wirken sich doch aus und können bei Nichtberücksichtigung eventuell sogar ein erfolgreiches Überführen eines Papierbahnstreifens von einer Behandlungsstation zur nächsten verhindern.However, it is also advantageous if the microprocessor for determining the individual pressures on the pneumatic devices also supported web speed and the paper web train at the following Treatment station considered. These values will be in the usual process anyway determined and can the microprocessor EDP-like without difficulty Will be provided. Both paper web speed as well as paper web train don't have one big influence on the pressures needed, but they have an effect and can be disregarded possibly even a successful transfer of one Paper web strip from a treatment station to prevent next.

Auch für die Einschaltdauer der Druckeinstellung sind diese beiden Parameter von Bedeutung. Je höher die Bahngeschwindigkeit und je höher der Bahnzug, desto eher kann man den Über- bzw. Unterdruck wieder abbauen und die Bahn auf ihre volle Breite schneiden. Deshalb ist es zweckmäßig, wenn über den Mikroprozessor auch die Zeitdauer der Druckgebung bestimmt wird.Also for the duty cycle of the pressure setting are these two parameters matter. The higher the Web speed and the higher the train, the more rather you can reduce the overpressure or underpressure again and cut the web to its full width. Therefore it is useful if also via the microprocessor the duration of printing is determined.

Nachfolgend wird anhand der Zeichnung, in der die pneumatisch unterstützten Vorrichtungen, die für das erfindungsgemäße Verfahren benötigt werden, schematisch dargestellt sind, ein Ausführungsbeispiel angeführt.The following is based on the drawing in which the pneumatic supported devices for the invention Procedures are needed, shown schematically are given an embodiment.

Eine Papierbahn (1) soll von einer Behandlungsstation (15) zu einer weiteren Behandlungsstation (16) überführt werden. Unter derartigen Behandlungsstationen sind die unterschiedlichsten Einrichtungen zu verstehen, beispielsweise ein Trockenzylinder, ein Walzenspalt eines Kalanders oder eine Aufwickeleinrichtung. Aus diesem Grund sind die Behandlungsstationen auch nur in Form eines Kastens (15,16) dargestellt. Die pneumatisch unterstützten Vorrichtungen zur Führung einer laufenden Papierbahn oder zumindest eines aus dieser geschnittenen Papierbahnstreifens (2,3) sind hinreichend bekannt. Die Vorrichtung (2) zeigt ein Leitblech (8), über welchem mittels einer Luftdüse (7) ein Luftpolster aufgebaut wird, auf dem wiederum die mit hoher Geschwindigkeit laufende Papierbahn (1) oder ein Streifen schwimmt. Die Düse (7) wird von einer Druckluftquelle (13) über ein Druckregelventil (12) versorgt, welches von der Steuerungseinheit (6) angesteuert wird.A paper web (1) is to be taken from a treatment station (15) transferred to a further treatment station (16) become. Under such treatment stations the different facilities are to be understood, for example a drying cylinder, a nip a calender or a winder. For this reason, the treatment stations are only shown in the form of a box (15,16). The pneumatic supported devices for guiding a running paper web or at least one of them cut paper web strips (2, 3) are sufficient known. The device (2) shows a baffle (8), above which by means of an air nozzle (7) Air cushion is built, on which in turn the high-speed paper web (1) or a Stripes floats. The nozzle (7) is from a compressed air source (13) supplied via a pressure control valve (12), which is controlled by the control unit (6) becomes.

Alternativ ist eine Vorrichtung (3) dargestellt, die ein über Rollen (10) laufendes perforiertes Tragband (9) umfaßt. In nicht dargestellter Weise ist wenigstens eine der Rollen angetrieben. Unterhalb des Bandes befindet sich ein Saugkasten (11), in dem ein Unterdruck erzeugt wird. Die Papierbahn oder zumindest ein aus dieser geschnittener Papierbahnstreifen wird dadurch an das Band angesaugt, dort festgehalten und mit dem laufenden Band weitertransportiert. Den Unterdruck im Saugkasten (11) erzeugt üblicherweise ein Ventilator (14). Dieser Ventilator kann wie das Druckregelventil (12) der ersten Vorrichtung (2) ebenfalls über die Steuerungseinheit (6) angesteuert werden, um den benötigten Unterdruck einzustellen, der wiederum von dem Mikroprozessor (4) vorgegeben wird. Selbstverständlich sind auch andere Stellorgane (12,14) einsetzbar. Alternatively, a device (3) is shown that a perforated carrier tape running over rollers (10) (9). At least in a manner not shown one of the rollers driven. Located below the band there is a suction box (11) in which a vacuum is produced. The paper web or at least one out this cut paper web strip is thereby the tape is sucked in, held there and up to date Band transported on. The negative pressure in A suction box (11) usually produces a fan (14). This fan can be like the pressure control valve (12) of the first device (2) also via the Control unit (6) can be controlled to the required Set negative pressure, which in turn by the Microprocessor (4) is specified. Of course other actuators (12, 14) can also be used.

Die von dem Mikroprozessor (4) vorgegebenen Werte sind zum größten Teil von der Papierqualität - und hier hauptsächlich von dem Gewicht des Papiers - abhängig. Deshalb soll der Bediener der Anlage an einer Bedieneinheit (5) des Mikroprozessors (4) das gewünschte Papiergewicht eingeben. Der Mikroprozessor (4) ermittelt daraufhin die benötigten Drücke, indem er sie formelmäßig berechnet oder als empirisch ermittelte und eingegebene Werte aus einem Speicher holt, und gibt sie anschließend an die Steuerungseinheit (6) weiter.The values specified by the microprocessor (4) are for the most part on paper quality - and here mainly depending on the weight of the paper. Therefore, the operator of the system should use an operating unit (5) the microprocessor (4) the desired paper weight enter. The microprocessor (4) determines then the pressures needed by formulating them calculated or as empirically determined and entered Fetches values from a memory and then returns them to the control unit (6).

Claims (7)

  1. Method for guiding a running paper web (1), or at least a strip of paper web cut from this, from one handling station (15) to the next (16) in a paper production or treatment process using at least one pneumatically aided device (2, 3) such as, for example, a compressed air control device (2) or a suction and transport device (3), the air pressure needed in the device (2, 3) being adjusted as a function of the paper quality being run at the time, characterised in that the adjustment of the air pressure as a function of the paper quality being run at the time ensues via a microprocessor (4).
  2. Method according to Claim 1, characterised in that the control unit (6) of at least one control element (12, 14) is actuated by the microprocessor (4).
  3. Method according to Claim 1 or 2, characterised in that after entry of a paper quality into the operator unit (5) of the microprocessor (4) the pressures needed at the individual, pneumatically operated devices (2, 3) are determined in the microprocessor (4).
  4. Method according to Claim 3, characterised in that for paper quality the gram weight of the paper is entered into the operator unit (5) of the microprocessor (4).
  5. Method according to one of Claims 1 to 4, characterised in that the microprocessor (4) also takes the speed of the paper web into consideration for the determination of the air pressures needed.
  6. Method according to one of Claims 1 to 4, characterised in that the microprocessor (4) also takes the tension of the paper web in the handling station (16) into consideration for the determination of the air pressures needed.
  7. Method according to one of Claims 1 to 6, characterised in that the microprocessor (4) determines the time duration of pressure application.
EP97110968A 1996-07-20 1997-07-02 Method for guiding a running paper web or at least the leader cut from that web Expired - Lifetime EP0819792B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19629323 1996-07-20
DE19629323 1996-07-20

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EP0819792A1 EP0819792A1 (en) 1998-01-21
EP0819792B1 true EP0819792B1 (en) 2000-11-02

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US6003750A (en) 1999-12-21
EP0819792A1 (en) 1998-01-21
DE59702557D1 (en) 2000-12-07

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