EP1502989B1 - Headbox device and method for operating the same - Google Patents

Headbox device and method for operating the same Download PDF

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Publication number
EP1502989B1
EP1502989B1 EP04102968A EP04102968A EP1502989B1 EP 1502989 B1 EP1502989 B1 EP 1502989B1 EP 04102968 A EP04102968 A EP 04102968A EP 04102968 A EP04102968 A EP 04102968A EP 1502989 B1 EP1502989 B1 EP 1502989B1
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EP
European Patent Office
Prior art keywords
light
sensor
jet
wire
fibrous suspension
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EP04102968A
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German (de)
French (fr)
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EP1502989A1 (en
Inventor
Johann Moser
Konstantin Fenkl
Joachim Grabscheid
Ottmar Kolb
Volker Schmidt-Rohr
Thomas Jaschinski
Wolfgang Ruf
Peter Mirsberger
Philipp Buchhold
Robert Hutterer
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Voith Patent GmbH
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Voith Patent GmbH
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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

Definitions

  • the invention relates to a device for applying a pulp suspension by means of a nozzle arrangement on an endlessly rotating sieve or between two endless rotating screens of a machine for producing a fibrous web from a pulp suspension, in particular headbox for a paper or board machine, with a means for applying the pulp suspension in the form a jet on the sieve or one of the sieves.
  • a headbox with a nozzle assembly for a paper machine is known.
  • the head box is equipped with a transverse and extending across the working width of the paper machine distributor for distributing the supplied pulp suspension.
  • a turbulizer in the headbox has a plurality of holes or channels.
  • means for adjusting the consistency of the pulp suspension over the working width are determined, wherein lines for controlled suspension flows - section streams - with individually adjustable properties such as the substance concentration or the material throughput are available.
  • the sectioned section is followed by a turbulence generator for homogenizing the pulp suspension.
  • the headbox "shows" basically in the direction of the filter.
  • a headbox in which the iris angle and / or iris board can be adjusted by apertures attached to the forward ends of the lower lip and lower lip Measure the tear length ratio and the formation of the paper web are affected.
  • headboxes have been designed for a desired beam impact point, which is visually inspected and optimized during operation of the machine. It is adapted to the operating conditions such as the jet thickness and the jet velocity.
  • the environment and the beam impingement point for visual optimization are not always suitable, in particular for gap shapers.
  • edge effects in the beam interfere with the view over the entire width of the beam.
  • this object is achieved in a headbox of the type mentioned above in that at least one optical measuring device for adjusting the Strahlauf Economicsticians on the sieve or at least one of the sieves is present.
  • the invention thus provides an optical auxiliary device for adjusting the Strahlauf Whyddlings.
  • the invention is not limited to use only with gap formers, but is also suitable, for example, for hybrid formers.
  • the measuring device comprises at least one means for generating a coherent light beam, in particular a laser, and at least one sensor for receiving the light beam.
  • the sensors or receivers are arranged on a strip, for example.
  • the at least one sensor as a sensor for the beam the fibrous suspension transmitted light on the means for generating the coherent light beam opposite side of the jet of the pulp suspension is arranged so that the light is irradiated at an acute angle through the jet of the pulp suspension.
  • the senor is arranged below the sieve or one of the sieves or in extension of a sieve table, around which a sieve is guided.
  • the sensor or the sensor arrangement can be reproducibly mounted outside the machine.
  • the setting for the respective application is preferably carried out at standstill.
  • the sensor is attached to a drainage element.
  • the senor is advantageously arranged as a sensor for light reflected from the jet of pulp suspension on the same side of the jet of pulp suspension as the means for generating the coherent light beam.
  • the senor is arranged on the same holding device as the means for generating the light beam.
  • the sensor is advantageously arranged on a screen table or a dewatering element of one of the two screens or on a holder connected to the nozzle arrangement.
  • the at least one means for generating the light beam in the vicinity of the Strahlaufterrorism is arranged.
  • optical means for influencing the light beam can be arranged between the at least one means for generating the light beam and the at least one sensor, such as lenses, diaphragms, semitransparent mirrors, interferometers or prisms or other focusing means.
  • the beam surface or another hydraulic line in particular the center of a separating wedge or an extension of the plane of a lip of the headbox nozzle, can be represented.
  • the device comprises a display device for displaying the impact points of the beam in a plane of the jet of the pulp suspension or on the surface of a screen.
  • the invention also relates to a method for operating a device in one of the embodiments illustrated above, wherein the device is adjusted during the standstill of the device or by means of a test liquid, in particular setting various parameters.
  • advantages of the invention are that the beam contour of a light beam emitted by a coherent light source light source is optically displayed and the impact situation is sensed.
  • the mounting of the laser can be done reproducibly on the headbox.
  • the fan-out of the jet can be represented by the turbulence.
  • the upper side of the beam and the lower beam side are optionally represented by a laser.
  • the impact situation is represented, for example, by a sensor area or bar with receivers in a display unit for indicating the beam impact position.
  • the angle of incidence is determined, for example, by a deformation of a light spot or a light surface from "round” to "elliptical";
  • correction factors are introduced, for example because of the screen thickness.
  • An advantage of the invention is also that a uniform quality of the product during manufacture is ensured. The optimization times are reduced. Better commissioning results are achieved, and working conditions for operating personnel are improved.
  • This shows a schematic cross-sectional view of a headbox of a Spaltformers.
  • the device comprises a headbox nozzle 1 from which, in a manner known per se, a pulp suspension in a jet 2 is applied to a gap former 3 with two screens, of which only one screen 4 is shown in the illustration.
  • Each of the light beams 8, 9 is partially transmitted under refraction, partially absorbed and partially reflected. In the device, therefore, sensors are used for measuring the reflected or the transmitted light beam.
  • a sensor 10 is disposed below the screen 4 for detecting the light transmitted through the beam 2, which is also transmitted from the screen 4.
  • the sensor 10 is applied, for example, on a dewatering element 11 and comprises a receiver module with a sensor surface.
  • a sensor which receives light that is reflected, for example, from the surface of the beam 2.
  • a separating wedge 12 is arranged, so that the beam 2 is emitted in two partial beams. Both partial beams can be optically examined and analyzed individually.
  • the values obtained by the optical measurements can be used, for example, to make adjustments or adjustments of the holes or channels in a turbulence generator integrated in the headbox, or to adjust the width or height of the nozzle from which the pulp suspension flows out.

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Abstract

In a papermaking process a fibrous suspension is discharged from a headbox jet onto an endless sieve belt, or sandwiched between two endless moving sieve belts. The assembly incorporates an optical measuring device (10) that facilitates adjustment of the point at which the suspension jet impinges on the sieve (4). The optical measuring device operates in conjunction with a laser source (6, 7) of coherent light (8, 9) that impinges on the sensor (10) located in the impingement zone under the sieve where it is attached to a dewatering element (11). The jet is set by calibration using a test fluid when the sieve is stationary.

Description

Die Erfindung betrifft eine Vorrichtung zum Aufbringen einer Faserstoffsuspension mittels einer Düsenanordnung auf ein endlos umlaufendes Sieb oder zwischen zwei endlos umlaufende Siebe einer Maschine zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension, insbesondere Stoffauflauf füreine Papier- oder Kartonmaschine, mit einem Mittel zum Aufbringen der Faserstoffsuspension in Form eines Strahls auf das Sieb oder eines der Siebe.The invention relates to a device for applying a pulp suspension by means of a nozzle arrangement on an endlessly rotating sieve or between two endless rotating screens of a machine for producing a fibrous web from a pulp suspension, in particular headbox for a paper or board machine, with a means for applying the pulp suspension in the form a jet on the sieve or one of the sieves.

Aus der DE 40 19 593 C2 ist ein Stoffauflauf mit einer Düsenanordnung füreine Papiermaschine bekannt. Der Stoffauflauf ist mit einem quer liegenden und sich über die Arbeitsbreite der Papiermaschine erstreckenden Verteiler zum Verteilen der zugeführtenFaserstoffsuspension ausgestattet. Ein Turbulenzerzeuger in dem Stoffauflauf weist eine Vielzahl von Löchern oder Kanälen auf. Es ist ein eine Düsefür das Ausströmen der Faserstoffsuspension bildender maschinenbreiter Auslaufkanal mit einem Auslaufspalt zum Abgeben der Stoffsuspension an ein Papiermaschinensieb vorhanden. Weiter sind Mittel zum Einstellen der Stoffdichte der Faserstoffsuspensionüber die Arbeitsbreite hinweg bestimmt, wobei Leitungen für geregelte Suspensionsströme - Sektionsströme - mit individuell einstellbaren Eigenschaften wie der Stoffkonzentration oder dem Stoffdurchsatz vorhanden sind. An den sektionierten Abschnitt schließt sich ein Turbulenzerzeuger zur Homogenisierung der Faserstoffsuspension an. Der Stoffauflauf "zeigt" hierbei grundsätzlich in Sieblaufrichtung.From the DE 40 19 593 C2 For example, a headbox with a nozzle assembly for a paper machine is known. The head box is equipped with a transverse and extending across the working width of the paper machine distributor for distributing the supplied pulp suspension. A turbulizer in the headbox has a plurality of holes or channels. There is a machine-wide discharge channel forming a nozzle for discharging the pulp suspension with a discharge nip for delivering the stock suspension to a papermaker's fabric. Further, means for adjusting the consistency of the pulp suspension over the working width are determined, wherein lines for controlled suspension flows - section streams - with individually adjustable properties such as the substance concentration or the material throughput are available. The sectioned section is followed by a turbulence generator for homogenizing the pulp suspension. The headbox "shows" basically in the direction of the filter.

In der DE 297 13 272 U1 wird ein Stoffauflauf beschrieben, in dem sich der Blendenanstellwinkel und/oder der Blendenvorstand von an den vorderen Enden der Unterlippe und der Unterlippe angebrachten Blenden verstellen lässt.Durch diese Maßnahme werden das Reißlängenverhältnis und die Formation der Papierbahn beeinflusst.In the DE 297 13 272 U1 For example, a headbox is described in which the iris angle and / or iris board can be adjusted by apertures attached to the forward ends of the lower lip and lower lip Measure the tear length ratio and the formation of the paper web are affected.

Bisher werden Stoffaufläufe für einen gewünschten Strahlauftreffpunkt konstruiert, der im Betrieb der Maschine visuell geprüft und optimiert wird. Dabei wird er den Betriebsbedingungen wie der Strahldicke und der Strahlgeschwindigkeit, angepasst. Das Umfeld und der Strahlauftreffpunkt zur visuellen Optimierung sind insbesondere bei Spalt - (Gap -) - Formern nicht immer geeignet. Zudem stören Randeffekte im Strahl die Einsicht über die gesamte Breite des Strahls.So far, headboxes have been designed for a desired beam impact point, which is visually inspected and optimized during operation of the machine. It is adapted to the operating conditions such as the jet thickness and the jet velocity. The environment and the beam impingement point for visual optimization are not always suitable, in particular for gap shapers. In addition, edge effects in the beam interfere with the view over the entire width of the beam.

Es ist die Aufgabe der Erfindung, die Vorrichtung derart zu verbessern, dass eine präzise Ausrichtung des von der Düsenanordnung abgegebenen Strahls der Faserstoffsuspension erreicht wird.It is the object of the invention to improve the device in such a way that a precise alignment of the jet of the pulp suspension emitted by the nozzle arrangement is achieved.

Erfindungsgemäß wird diese Aufgabe bei einem Stoffauflauf der eingangs genannten Art dadurch gelöst, dass mindestens eine optische Messeinrichtung zum Justieren des Strahlauftreffpunkts auf das Sieb oder zumindest eines der Siebe vorhanden ist.According to the invention this object is achieved in a headbox of the type mentioned above in that at least one optical measuring device for adjusting the Strahlauftreffpunkts on the sieve or at least one of the sieves is present.

Durch die Erfindung wird somit eine optische Hilfseinrichtung zur Justierung des Strahlauftreffpunkts geschaffen. Die Erfindung ist nicht nur auf den Einsatz bei Spaltformern beschränkt, sondern eignet sich beispielsweise auch für Hlybridformer.The invention thus provides an optical auxiliary device for adjusting the Strahlauftreffpunkts. The invention is not limited to use only with gap formers, but is also suitable, for example, for hybrid formers.

Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen, der Beschreibung und der Zeichnung.Advantageous developments emerge from the subclaims, the description and the drawing.

In einer vorteilhaften Ausgestaltung umfasst die Messeinrichtung mindestens ein Mittel zum Erzeugen eines kohärenten Lichtstrahls, insbesondere einen Laser, und mindestens einen Sensor zum Empfangen des Lichtstrahls. Die Sensoren oder Empfängersind beispielsweise auf einer Leiste angeordnet.In an advantageous embodiment, the measuring device comprises at least one means for generating a coherent light beam, in particular a laser, and at least one sensor for receiving the light beam. The sensors or receivers are arranged on a strip, for example.

Von Vorteil ist es, wenn der mindestens eine Sensor als Sensor für von dem Strahl der Faserstoffsuspension transmittiertes Licht auf der dem Mittel zum Erzeugen des kohärenten Lichtstrahls gegenüberliegenden Seite des Strahls der Faserstoffsuspension angeordnet ist, so dass das Licht unter einem spitzen Winkel durch den Strahl der Faserstoffsuspension hindurchgestrahlt wird.It is advantageous if the at least one sensor as a sensor for the beam the fibrous suspension transmitted light on the means for generating the coherent light beam opposite side of the jet of the pulp suspension is arranged so that the light is irradiated at an acute angle through the jet of the pulp suspension.

Hierbei ist der Sensor beispielsweise unterhalb des Siebs oder eines der Siebe oder in Verlängerung eines Siebtisches angeordnet, um den ein Sieb herumgeführt wird. Dadurch kann der Sensor oder die Sensoranordnung außerhalb der Maschine reproduzierbar montiert werden. Die Einstellung fürdie jeweilige Anwendung wird bevorzugt im Stillstand erfolgen. Oder der Sensor ist an einem Entwässerungselement befestigt.In this case, for example, the sensor is arranged below the sieve or one of the sieves or in extension of a sieve table, around which a sieve is guided. As a result, the sensor or the sensor arrangement can be reproducibly mounted outside the machine. The setting for the respective application is preferably carried out at standstill. Or the sensor is attached to a drainage element.

Anstelle des Transmissionsprinzips wird alternativ mit Vorteil der Sensor als Sensor fürvon dem Strahl der Faserstoffsuspension reflektiertes Licht auf derselben Seite des Strahls der Faserstoffsuspension wie das Mittel zum Erzeugen des kohärenten Lichtstrahls angeordnet.Alternatively, instead of the transmission principle, the sensor is advantageously arranged as a sensor for light reflected from the jet of pulp suspension on the same side of the jet of pulp suspension as the means for generating the coherent light beam.

Hierbei ist beispielsweise der Sensor an derselben Halteeinrichtung angeordnet ist wie das Mittel zum Erzeugen des Lichtstrahls.Here, for example, the sensor is arranged on the same holding device as the means for generating the light beam.

Vorteilhaft ist der Sensor an einem Siebtisch oder einem Entwässerungselement eines der beiden Siebe oder an einer mit der Düsenanordnung verbundenen Halterung angeordnet.The sensor is advantageously arranged on a screen table or a dewatering element of one of the two screens or on a holder connected to the nozzle arrangement.

In einer weiteren vorteilhaften Ausgestaltung ist das mindestens eine Mittel zum Erzeugen des Lichtstrahls in der Nähe des Strahlauftreffpunktes der Faserstrahlsuspension auf dem Sieb bzw. einem der Siebe angeordnet.In a further advantageous embodiment, the at least one means for generating the light beam in the vicinity of the Strahlauftreffpunktes the fiber jet suspension on the screen or one of the sieves is arranged.

Zudem lassen sich zwischen dem mindestens einen Mittel zum Erzeugen des Lichtstrahls und dem mindestens einen Sensor optische Mittel zur Beeinflussung des Lichtstrahls anordnen wie Linsen, Blenden, halbdurchlässige Spiegel, Interferometer oder Prismen oder andere Fokussiermittel.In addition, optical means for influencing the light beam can be arranged between the at least one means for generating the light beam and the at least one sensor, such as lenses, diaphragms, semitransparent mirrors, interferometers or prisms or other focusing means.

Durch den Laser lässt sich beispielsweise die Strahloberfläche oder eine andere hydraulische Linie, insbesondere die Mitte eines Trennkeils oder eine Verlängerung der Ebene einer Lippe der Stoffauflaufdüse, darstellen.By means of the laser, for example, the beam surface or another hydraulic line, in particular the center of a separating wedge or an extension of the plane of a lip of the headbox nozzle, can be represented.

In einer weiteren vorteilhaften Ausgestaltung umfasst die Vorrichtung eine Anzeigeeinrichtung zur Darstellung der Auftreffpunkte des Strahls in einer Ebene des Strahls der Faserstoffsuspension oder auf der Oberfläche eines Siebs.In a further advantageous embodiment, the device comprises a display device for displaying the impact points of the beam in a plane of the jet of the pulp suspension or on the surface of a screen.

Gemäßeiner Ausführungsform der Erfindung ist es von Vorteil, wenn sie eine Recheneinheit zur Bestimmung des Auftreffwinkels, des Auftreffpunkts oder der Auftreffflächedes Lichtstrahls in einer Ebene der Faserstoffsuspension oder auf der Oberfläche eines Siebs umfasst.According to one embodiment of the invention, it is advantageous if it comprises a computing unit for determining the angle of incidence, the point of impact or the area of impact of the light beam in a plane of the pulp suspension or on the surface of a sieve.

Die Erfindung betrifft auch ein Verfahren zum Betreiben einer Vorrichtung in einer der oben dargestellten Ausführungsfomen, wobei die Vorrichtung während des Stillstands der Vorrichtung oder mittels einer Testflüssigkeit, insbesondere unter Einstellung verschiedener Parameter, justiert wird.The invention also relates to a method for operating a device in one of the embodiments illustrated above, wherein the device is adjusted during the standstill of the device or by means of a test liquid, in particular setting various parameters.

Insgesamt bestehen Vorteile der Erfindung darin, dass die Strahlkontur eines von einer kohärentesLicht emittierenden Lichtquelle ausgestrahlten Lichtstrahls optisch dargestellt wird und die Auftreffsituation sensorisch abgegriffen wird. Die Montage des Lasers kann dabei reproduzierbar am Stoffauflauf erfolgen.Overall, advantages of the invention are that the beam contour of a light beam emitted by a coherent light source light source is optically displayed and the impact situation is sensed. The mounting of the laser can be done reproducibly on the headbox.

Durch die Einstellung des Winkels, unter dem das Licht auf den Strahl der Faserstoffsuspension abgestrahlt wird, oder durch eine Optik bei Verwendung eines Lasers oder einer anderen kohärenten Lichtquelle kann die Strahlauffächerung durch die Turbulenz dargestellt werden. Die Strahloberseite und die Strahlunterseite werden optional durch jeweils einen Laser dargestellt.By adjusting the angle at which the light is radiated onto the jet of pulp suspension, or through optics using a laser or other coherent light source, the fan-out of the jet can be represented by the turbulence. The upper side of the beam and the lower beam side are optionally represented by a laser.

Die Auftreffsituation wird zum Beispiel durch eine Sensorfläche oder Leiste mit Empfängernin einer Anzeigeeinheit zur Anzeige der Strahlauftreffposition dargestellt. Rechnerisch wird der Auftreffwinkel etwa durch eine Verformung eines Lichtpunktes oder einer Lichtfläche von "rund" zu "elliptisch" bestimmt; zusätzlich werden Korrekturfaktoren, beispielsweise wegen der Siebdicke, eingeführt.The impact situation is represented, for example, by a sensor area or bar with receivers in a display unit for indicating the beam impact position. Mathematically, the angle of incidence is determined, for example, by a deformation of a light spot or a light surface from "round" to "elliptical"; In addition, correction factors are introduced, for example because of the screen thickness.

Ein Vorteil der Erfindung besteht auch darin, dass eine gleichmäßigeQualität des Produkts während der Herstellung gewährleistet wird. Die Optimierungszeiten werden reduziert. Es werden bessere Inbetriebnahmeergebnisse erzielt, und die Arbeitsbedingungen für das Betriebspersonal werden verbessert.An advantage of the invention is also that a uniform quality of the product during manufacture is ensured. The optimization times are reduced. Better commissioning results are achieved, and working conditions for operating personnel are improved.

Nachstehend wird die Erfindung in einem Ausführungsbeispiel anhand der einzigen Figur erläutert. Diese zeigt eine schematische Querschnittsansicht eines Stoffauflaufs eines Spaltformers.The invention will be explained in an embodiment with reference to the single figure. This shows a schematic cross-sectional view of a headbox of a Spaltformers.

Die Vorrichtung umfasst eine Stoffauflaufdüse 1, aus der in an sich bekannter Weise eine Faserstoffsuspension in einem Strahl 2 auf einen Spaltformer 3 mit zwei Sieben aufgebracht wird, von denen in der Darstellung nur ein Sieb 4 gezeigt wird.The device comprises a headbox nozzle 1 from which, in a manner known per se, a pulp suspension in a jet 2 is applied to a gap former 3 with two screens, of which only one screen 4 is shown in the illustration.

An einer Seitenfläche 5 der Stoffauflaufdüse 1 sind zwei Lichtquellen 6, 7, insbesondere Laserlichtquellen, zur Erzeugung kohärenter Lichtstrahlen angeordnet. Diese erzeugen jeweils einen Lichtstrahl 8, 9, der durch den Strahl 2 der Faserstoffsuspension hindurchstrahlt.On a side surface 5 of the headbox nozzle 1, two light sources 6, 7, in particular laser light sources, arranged to generate coherent light beams. These each generate a light beam 8, 9, which radiates through the beam 2 of the pulp suspension.

Jeder der Lichtstrahlen 8, 9 wird dabei unter Brechung zum Teil hindurchgelassen, zum Teil absorbiert und zum Teil reflektiert. In der Vorrichtung werden daher Sensoren zum Messen des reflektierten oder des hindurchgelassenen Lichtstrahls eingesetzt.Each of the light beams 8, 9 is partially transmitted under refraction, partially absorbed and partially reflected. In the device, therefore, sensors are used for measuring the reflected or the transmitted light beam.

Ein Sensor 10 ist unterhalb des Siebs 4 zum Detektieren des durch den Strahl 2 transmittierten Lichts angeordnet, das zudem noch von dem Sieb 4 hindurchgelassen wird. Der Sensor 10 ist beispielsweise auf einem Entwässerungselement 11 aufgebracht und umfasst ein Empfängermodul mit einer Sensorfläche.A sensor 10 is disposed below the screen 4 for detecting the light transmitted through the beam 2, which is also transmitted from the screen 4. The sensor 10 is applied, for example, on a dewatering element 11 and comprises a receiver module with a sensor surface.

Zusätzlichoder alternativ wird ein Sensor vorgesehen, der Licht aufnimmt, das beispielsweise von der Oberfläche des Strahls 2 reflektiert wird.Additionally or alternatively, a sensor is provided which receives light that is reflected, for example, from the surface of the beam 2.

In der Mitte der Stoffauflaufdüse 1 ist ein Trennkeil 12 angeordnet, so dass der Strahl 2 in zwei Teilstrahlen ausgestrahlt wird. Beide Teilstrahlen lassen sich optisch jeweils einzeln untersuchen und analysieren.In the middle of the headbox nozzle 1, a separating wedge 12 is arranged, so that the beam 2 is emitted in two partial beams. Both partial beams can be optically examined and analyzed individually.

Die Einstellung der Richtungen, unter denen die Lichtstrahlen ausgestrahlt werden, erfolgt entweder im Stillstand oder mit einer im Vergleich zu der Faserstoffsuspension stärker transparenten Flüssigkeitwie Wasser, um die bei unterschiedlichen Arbeitsparametern, wie z. B. unterschiedlichen Geschwindigkeiten der Teilstrahlen oder des Strahls 2, auftretenden Änderungen vorab leicht erfassen zu können und die Anordnung der Sensoren entsprechend einrichten zu können. Ebenso lassen sich durch eine derartige Kalibrierung auch Korrekturfaktoren berücksichtigen, die auf unterschiedlichen Siebdicken oder anderen Parametern des Doppelsiebformers beruhen.The adjustment of the directions under which the light beams are emitted, either at a standstill or with a more transparent compared to the pulp suspension liquid such as water in order to work at different operating parameters, such as. B. different velocities of the partial beams or the beam 2, occurring changes in advance can be easily detected and set up the arrangement of the sensors accordingly. Likewise, such a calibration can also take into account correction factors which are based on different screen thicknesses or other parameters of the twin-wire former.

Die durch die optischen Messungen gewonnenen Werte lassen sich verwenden, um beispielsweise in einem in der Stoffauflaufdüse integrierten Turbulenzerzeuger Einstellungen oder Verstellungen der Löcheroder Kanäle vorzunehmen oder die Breite oder Höhe der Düse einzustellen, aus der die Faserstoffsuspension herausströmt.The values obtained by the optical measurements can be used, for example, to make adjustments or adjustments of the holes or channels in a turbulence generator integrated in the headbox, or to adjust the width or height of the nozzle from which the pulp suspension flows out.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Stoffauflaufdüseheadbox
22
Strahlbeam
33
Spaltformergap former
44
Siebscree
55
Seitenflächeside surface
66
Lichtquellelight source
77
Lichtquellelight source
88th
Lichtstrahlbeam of light
99
Lichtstrahlbeam of light
1010
Sensorsensor
1111
Entwässerungselementdewatering element
1212
Trennkeilseparating wedge

Claims (13)

  1. Device for applying a fibrous suspension by means of a nozzle arrangement to an endlessly circulating wire (4) or between two endlessly circulating wires of a machine for producing a fibrous web from a fibrous suspension, in particular a headbox for a paper or board machine, having a means (1) for applying the fibrous suspension in the form of a jet (2) to the wire (4) or one of the wires,
    characterized in that
    there is at least one optical measuring device for adjusting the point of impingement of the jet on the wire (4) or at least one of the wires.
  2. Device according to Claim 1, characterized in that the at least one measuring device comprises at least one means (6, 7) for producing a coherent beam of light (8, 9), in particular a laser, and at least one sensor (10) for receiving the beam of light (8, 9).
  3. Device according to Claim 2, characterized in that the at least one sensor (10) is arranged on the side of the jet (2) of fibrous suspension opposite the means (6, 7) for producing the beam of light (8, 9), as a sensor for the light transmitted by the jet of fibrous suspension.
  4. Device according to Claim 3, characterized in that the at least one sensor (10) is arranged underneath the wire (4) or one of the wires or in the extension of a wire table around which the wire (4) or one of the wires is led, or in that the sensor (10) is fixed to a dewatering element.
  5. Device according to Claim 2, characterized in that the at least one sensor (10) is arranged on the same side of the jet of fibrous suspension as the means (6, 7) for producing the beam of light (8, 9), as a sensor for the light reflected by the jet of fibrous suspension.
  6. Device according to Claim 5, characterized in that the at least one sensor (10) is arranged on the same holding device as the means (6, 7) for producing the beam of light (8, 9).
  7. Device according to Claim 5 or 6, characterized in that the at least one sensor (10) is arranged on a wire table or a dewatering element of one of the two wires or on a mounting connected to the nozzle arrangement.
  8. Device according to one of Claims 2 to 7, characterized in that the at least one means (6, 7) for producing the beam of light (8, 9) is arranged in the vicinity of the point of impingement of the jet of fibrous suspension on the wire (4) or one of the wires.
  9. Device according to one of Claims 2 to 8, characterized in that, between the at least one means (6, 7) for producing the beam of light (8, 9) and the at least one sensor (10), there are arranged optical means for influencing the beam of light (8, 9).
  10. Device according to one of Claims 1 to 9, characterized in that the jet surface or another hydraulic line, in particular the centre of a dividing wedge (12) or an extension of the plane of one lip of the means (1) for applying the fibrous suspension, can be displayed by means of the means (6, 7) for producing the beam of light.
  11. Device according to one of Claims 1 to 10, characterized in that it comprises a display device for displaying the points of impingement of the beam of light (8, 9) in a plane of the jet (2) of fibrous suspension or on the surface of a wire (4).
  12. Device according to one of Claims 1 to 11, characterized in that it comprises a computing unit for determining the angle of impingement, the point of impingement or the area of impingement of the beam of light (8, 9) in a plane of the fibrous suspension or on the surface of a wire.
  13. Method for operating the device according to one of Claims 1 to 12, characterized in that the device is adjusted when the device is stationary or by means of a test liquid, in particular with the setting of various parameters.
EP04102968A 2003-07-25 2004-06-25 Headbox device and method for operating the same Expired - Lifetime EP1502989B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10333977A DE10333977A1 (en) 2003-07-25 2003-07-25 headbox
DE10333977 2003-07-25

Publications (2)

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EP1502989A1 EP1502989A1 (en) 2005-02-02
EP1502989B1 true EP1502989B1 (en) 2008-07-23

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EP04102968A Expired - Lifetime EP1502989B1 (en) 2003-07-25 2004-06-25 Headbox device and method for operating the same

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EP (1) EP1502989B1 (en)
AT (1) ATE402286T1 (en)
DE (2) DE10333977A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8490575B2 (en) 2009-05-11 2013-07-23 Marco Systemanalyse Und Entwicklung Gmbh Valve

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008041118A1 (en) * 2008-08-08 2010-02-11 Voith Patent Gmbh Method for influencing at least one operating and / or quality property in the production of a fibrous web and sheet forming system for carrying out the method

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4019593C2 (en) * 1990-06-20 1994-01-20 Voith Gmbh J M Headbox for paper machines
DE4239845C2 (en) * 1992-11-05 1998-12-03 Voith Gmbh J M Procedure for measuring the effect of adjustments on the headbox and for correcting the basis weight and fiber orientation cross profile
DE19709294A1 (en) * 1997-03-07 1998-09-10 Voith Sulzer Papiermasch Gmbh Paper-making fourdrinier zone
DE29713272U1 (en) * 1997-07-25 1997-11-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Headbox to form a fiber suspension layer
DE19831612A1 (en) * 1998-07-14 2000-01-20 Voith Sulzer Papiermasch Gmbh Measuring system
SE515640C2 (en) * 2000-01-18 2001-09-17 Stora Kopparbergs Bergslags Ab Method and apparatus for the manufacture of paper or paperboard, as well as paper or paperboard products
FI20002680A0 (en) * 2000-12-07 2000-12-07 Valmet Corp A method and apparatus for adjusting the dry matter profile of a web on a wire section of a paper machine / board machine
FI20020890A (en) * 2002-05-10 2003-11-11 Antti Niemi Method and Equipment for Determining and Controlling a Water Border in a Fourdrinier Paper Machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8490575B2 (en) 2009-05-11 2013-07-23 Marco Systemanalyse Und Entwicklung Gmbh Valve

Also Published As

Publication number Publication date
ATE402286T1 (en) 2008-08-15
DE10333977A1 (en) 2005-02-10
DE502004007649D1 (en) 2008-09-04
EP1502989A1 (en) 2005-02-02

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