EP1413674B1 - Method for monitoring the condition of a clothing - Google Patents

Method for monitoring the condition of a clothing Download PDF

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Publication number
EP1413674B1
EP1413674B1 EP03103684A EP03103684A EP1413674B1 EP 1413674 B1 EP1413674 B1 EP 1413674B1 EP 03103684 A EP03103684 A EP 03103684A EP 03103684 A EP03103684 A EP 03103684A EP 1413674 B1 EP1413674 B1 EP 1413674B1
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EP
European Patent Office
Prior art keywords
fabric
condition
registered
felt
dimensional image
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EP03103684A
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German (de)
French (fr)
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EP1413674A1 (en
Inventor
Rudolf Münch
Wolfgang Dr. Ulfert
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Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • 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
    • D21F1/32—Washing wire-cloths or felts

Definitions

  • the invention relates to a method for monitoring the condition of a circumferential string used in a paper or board machine, e.g. Felt or sieve, in which condition data of the clothing are detected by means of a condition sensor and an evaluation unit generates from the acquired condition data an at least two-dimensional image of the clothing condition, which reproduces both the state progression in the machine direction and the state progression in the cross machine direction, the clothing in the cross machine direction is scanned.
  • condition data of the clothing are detected by means of a condition sensor and an evaluation unit generates from the acquired condition data an at least two-dimensional image of the clothing condition, which reproduces both the state progression in the machine direction and the state progression in the cross machine direction, the clothing in the cross machine direction is scanned.
  • Such a method is for example from the two publications DE 198 60 567 A1 and US 5,725,737 known.
  • the prior art is exclusively concerned with properties of the material web.
  • the invention has for its object to provide a method of the type mentioned, with which an optimal representation of the clothing properties in both the machine direction and in the cross-machine direction is possible.
  • This object is achieved in a method of the aforementioned type according to the invention in that the transverse scanning is performed by means of a scanner and that the at least two-dimensional image of the state of clothing is correlated with at least one predetermined property of the paper or board web.
  • the state data are preferably representative of at least one predefinable property of the clothing.
  • the image of the state of clothing can in particular be created in such a way that this state of clothing is reproduced in the manner of a map.
  • the state progression in the machine direction and the state progression in the cross machine direction are reproduced in the form of contour lines and / or color transitions.
  • a three-dimensional image or view of the clothing state for example in the form of a spatial grid, a spatial waterfall representation and / or the like, can also be created.
  • the transverse scanning can take place over several minutes and preferably over the duration of at least one string circulation. According to a preferred practical embodiment, the transverse scanning takes place over the duration of several stringing cycles.
  • the scanner can therefore be moved very slowly over the clothing, so that a scan process, for example, lasts several minutes or corresponds to one or more clothing cycles.
  • the condition data of the clothing can be detected continuously with a predefinable sampling rate.
  • condition data of the clothing are detected at such a high sampling rate that a plurality of condition data is obtained during a clothing circulation.
  • the clothing circulation is detected at the same time.
  • this clothing circulation can be detected, for example, via a travel measurement or via a time measurement and / or the like. From the time measurement and the speed, for example, also the strain can be calculated. Such an expansion of the clothing can additionally be used as a trigger for the time.
  • the covering can be detected, for example, via at least one marking provided on or in the covering and the measurement of a corresponding trigger signal.
  • the at least two-dimensional image of the clothing condition is preferably created from condition data which has been recorded by means of at least one transverse scanning of the clothing over the duration of a plurality of clothing revolutions.
  • the at least two-dimensional image of the clothing condition can be created from condition data which has been acquired by means of several transverse scans and preferably averaged and / or filtered.
  • the two-dimensional image of the clothing allows corresponding conclusions to be drawn about the condition of the clothing even if this clothing condition has changed only in a small space, and these changes would no longer be detectable with the conventional measuring methods.
  • a state sensor with one or more sensors can be used as a scanner.
  • a state sensor system with a plurality of consecutive sensors in the cross-machine direction is used as the scanner. The same or different status data can be detected.
  • a stringing mark e.g. a mark, a particular woven or inlaid wire, a punch mark, a color mark and / or the like may be provided.
  • At least one triggering sensor responding to the clothing marking can be used.
  • At least one trigger sensor is used on both sides of the paper or board machine.
  • a skewed felt seam (felt bracing) can be traced, and it can, for example, a color chart are drawn relative to the felt seam, if this runs obliquely.
  • the state data to be acquired may be, for example, one or more of the following variables: water absorption capacity, water content, optical Properties, temperature, compressibility (elasticity), thickness, contamination, damping and / or the like.
  • FIG. 1 shows a schematic representation of a device 10 for monitoring the state of a used in a paper or board machine circumferential string, here for example a felt 12th
  • the device 10 comprises a state sensor or scanner 14 for detecting state data of the felt 12 and an evaluation unit 16 for producing an at least two-dimensional image of the felt state from the acquired state data representing both the state progression in the machine direction and the state progression in the cross machine direction.
  • the evaluation unit 16 may in particular comprise a computer and / or the like.
  • the felt 12 is guided around a plurality of rollers 18.
  • the state data acquired via the state sensor system 14 can be representative of at least one predefinable property of the felt, e.g. Permeability, be.
  • the example colored image of the felt state can be created in particular so that this felt state is reproduced on a kind of map.
  • the state progression in the machine direction and the state progression in the cross machine direction for example in the form of source lines and / or drive transitions, can be reproduced.
  • Such a two-dimensional image of the felt state, here the felt permeability is in the FIG. 2 played.
  • felt length 0% to 100%.
  • the condition sensor 14 may include one or more sensors. It is moved in the cross-machine direction CD.
  • the felt circulation is detected via at least one marking 20 provided on or in the felt 12 and the measurement of a corresponding trigger signal by means of a trigger sensor 22.
  • the evaluation unit 16 is in particular for a measured value detection for the position of the state sensor system 14 in the cross-machine direction, the quality or property signals and the trigger signal as well as for the calculation of the two-dimensional image (see also FIG. 2 ) of the felt 12.
  • the relevant representation for example, be independent of the elongation of the felt 12.
  • the circulating felt 12 is conveyed by means of the condition sensor 14, e.g. scanned in the cross machine direction.
  • the state sensor system 14 may thus include in particular a scanner or the like. The transverse scanning takes place while the felt 12 is running.
  • the state sensor 14 or the scanner moves very slowly over the clothing, here for example the felt 12.
  • a traversing or a scanning process takes several minutes and corresponds to m felt cycles.
  • the state data of the felt 12 are recorded continuously at a very high sampling rate, so that, for example, n values are recorded during a felt circulation.
  • n values are recorded during a felt circulation.
  • the Filzumlauf is simultaneously via a displacement measurement, or more easily via a marker 20 (see. FIG. 1 ) on the felt 12 and a via a trigger sensor 22 (see. FIG. 1 ) detected trigger signal detected.
  • the state sensor 14 may comprise one or more, for example in the cross-machine direction consecutive sensors.
  • a mark in particular a woven or inlaid wire, a punch mark, a color mark and / or the like may be provided as the clothing mark 20.
  • trigger sensors 22 can also be provided on both sides of the machine. This can also be a skewed felt seam (felt bracing) be reconstructed, and it can the color chart (see. FIG. 2 ) are then drawn relative to the felt seam, if the felt seam runs obliquely.
  • felt bracing felt bracing
  • the felt length is measured relative to the position of the trigger signal.
  • the position of the trigger signal relative to the felt seam should be known. Ideally, these positions are identical.
  • the felt length increases with time.
  • the advantage is that a change in length remains visible.
  • the felt width in% is e.g. with web edge scan, e.g. optical or inductive, called.
  • the two-dimensional image of the clothing also allows conclusions to be drawn about the condition of the clothing, if the condition is only changed in a small scale and such a change would no longer be detectable with the conventional measuring methods.
  • the two-dimensional image can also be correlated with paper or paperboard properties to determine if the small-area state differences in the fabric affect paper or board quality. Similar considerations also arise in an application of the invention to other clothing (eg forming fabrics) or the use of other sensors (eg permeability measurement, etc.).

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Abstract

In a paper manufacturing process an endless de-watering sieve or felt belt (12) is maintained under tension. The tension value is monitored by sensors (14) coupled to a computer (16) which evaluates the data to provide a two-dimensional presentation of the sieve or web condition in both longitudinal and transverse profile. The data captured is representative of at least one pre-defined property and is presented in map form using e.g. contours and colour. The map may be in two, or three-dimensional presentation e.g. in the form of a space frame, waterfall presentation or similar. The belt or sieve are scanned transversely. Also claimed is a commensurate sieve or felt belt monitoring assembly monitoring e.g. water content take-up capacity, actual water content, optical properties, temperature, elasticity, thickness, soiling, dampening etc.

Description

Die Erfindung betrifft ein Verfahren zur Überwachung des Zustandes einer in einer Papier- oder Kartonmaschine eingesetzten umlaufenden Bespannung, z.B. Filzes oder Siebes, bei dem mittels einer Zustandssensorik Zustandsdaten der Bespannung erfasst werden und mittels einer Auswerteeinheit aus den erfassten Zustandsdaten ein zumindest zweidimensionales Abbild des Bespannungszustandes erstellt wird, das sowohl den Zustandsverlauf in Maschinenlaufrichtung als auch den Zustandsverlauf in Maschinenquerrichtung wiedergibt, wobei die Bespannung in Maschinenquerrichtung abgetastet wird.The invention relates to a method for monitoring the condition of a circumferential string used in a paper or board machine, e.g. Felt or sieve, in which condition data of the clothing are detected by means of a condition sensor and an evaluation unit generates from the acquired condition data an at least two-dimensional image of the clothing condition, which reproduces both the state progression in the machine direction and the state progression in the cross machine direction, the clothing in the cross machine direction is scanned.

Ein derartiges Verfahren ist beispielsweise aus den beiden Druckschriften DE 198 60 567 A1 und US 5,725,737 bekannt.Such a method is for example from the two publications DE 198 60 567 A1 and US 5,725,737 known.

Es werden bereits Sensoren eingesetzt, die quer zur Maschinenlaufrichtung (CD) über die Bespannung einer Papiermaschine bewegt werden, um diese zu scannen. Auf diese Art und Weise werden beispielsweise Feuchtequerprofile von Pressfilzen gemessen. Bisher werden bei einem Scan-Vorgang etwa 100 bis 1000 Messwerte über die Bahnbreite aufgenommen. Da während eines Scan-Vorgangs die Bespannung, z.B. ein Filz, mehrfach umläuft, wird ein mittleres Feuchtequerprofil des gesamten Filzes dargestellt. Unterschiede des Filzzustandes in Maschinenlaufrichtung (MD) werden damit jedoch nicht erfasst.Already sensors are used, which are moved across the machine direction (CD) on the fabric of a paper machine to scan them. For example, moisture cross-sections of press felts are measured in this way. Up to now, about 100 to 1000 measured values have been recorded over the web width during a scan process. Since during a scanning process the clothing, e.g. a felt, circulating several times, a mean moisture profile of the entire felt is shown. However, differences in felt state in the machine direction (MD) are not recorded.

In "Metso Automation News", Pressemitteilung vom 4. Juni 2002, ist bereits ein Ganzblatt-Feuchtemessverfahren (fullsheet moisture measurement) angegeben, mit dem eine Trennung von sich in Maschinenlaufrichtung und in Querrichtung ergebenden Änderungen erreicht wird. In "ipw 11/2001", Seite 27, ist ein Bahn-Scanner zur online-Ermittlung des Feuchtequerprofils einer Materialbahn, insbesondere einer Papier- oder Kartonbahn, über die volle Bahnbreite unmittelbar nach der Pressenpartie angegeben."Metso Automation News", June 4, 2002 press release already states a fullsheet moisture measurement that achieves separation between machine direction and cross direction. In "ipw 11/2001", page 27, a web scanner for online determination of the moisture CD profile of a material web, in particular a paper or board web, is given over the full web width immediately after the press section.

Der bisherige Stand der Technik ist ausschließlich mit Eigenschaften der Materialbahn befasst.The prior art is exclusively concerned with properties of the material web.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu schaffen, mit dem eine optimale Darstellung der Bespannungseigenschaften sowohl in Maschinenlaufrichtung als auch in Maschinenquerrichtung möglich ist.The invention has for its object to provide a method of the type mentioned, with which an optimal representation of the clothing properties in both the machine direction and in the cross-machine direction is possible.

Diese Aufgabe wird bei einem Verfahren der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass die Querabtastung mittels eines Scanners erfolgt und dass das zumindest zweidimensionale Abbild des Bespannungszustandes mit wenigstens einer vorgebbaren Eigenschaft der Papier- bzw. Kartonbahn korreliert wird.This object is achieved in a method of the aforementioned type according to the invention in that the transverse scanning is performed by means of a scanner and that the at least two-dimensional image of the state of clothing is correlated with at least one predetermined property of the paper or board web.

Die Zustandsdaten sind vorzugsweise repräsentativ für zumindest eine vorgebbare Eigenschaft der Bespannung.The state data are preferably representative of at least one predefinable property of the clothing.

Das Abbild des Bespannungszustandes kann insbesondere so erstellt werden, dass dieser Bespannungszustand nach Art einer Landkarte wiedergegeben wird.The image of the state of clothing can in particular be created in such a way that this state of clothing is reproduced in the manner of a map.

Gemäß einer bevorzugten praktischen Ausgestaltung des erfindungsgemäßen Verfahrens werden der Zustandverlauf in Maschinenlaufrichtung und der Zustandverlauf in Maschinenquerrichtung in Form von Höhenlinien und/oder Farbübergängen wiedergegeben.According to a preferred practical embodiment of the method according to the invention, the state progression in the machine direction and the state progression in the cross machine direction are reproduced in the form of contour lines and / or color transitions.

Grundsätzlich kann auch ein dreidimensionales Abbild oder Ansicht des Bespannungszustandes, z.B. in Form eines räumlichen Gitters, einer räumlichen Wasserfalldarstellung und/oder dergleichen, erstellt werden.In principle, a three-dimensional image or view of the clothing state, for example in the form of a spatial grid, a spatial waterfall representation and / or the like, can also be created.

Die Querabtastung kann über mehrere Minuten und vorzugsweise über die Dauer wenigstens eines Bespannungsumlaufs erfolgen. Gemäß einer bevorzugten praktischen Ausgestaltung erfolgt die Querabtastung über die Dauer mehrerer Bespannungsumläufe.The transverse scanning can take place over several minutes and preferably over the duration of at least one string circulation. According to a preferred practical embodiment, the transverse scanning takes place over the duration of several stringing cycles.

Der Scanner kann also sehr langsam über die Bespannung gefahren werden, so dass ein Scan-Vorgang beispielsweise mehrere Minuten dauert oder einem oder mehreren Bespannungsumläufen entspricht.The scanner can therefore be moved very slowly over the clothing, so that a scan process, for example, lasts several minutes or corresponds to one or more clothing cycles.

Die Zustandsdaten der Bespannung können kontinuierlich mit einer vorgebbaren Abtastrate erfasst werden.The condition data of the clothing can be detected continuously with a predefinable sampling rate.

Bevorzugt werden die Zustandsdaten der Bespannung mit einer derart hohen Abtastrate erfasst, dass während eines Bespannungsumlaufs eine Mehrzahl von Zustandsdaten anfällt.Preferably, the condition data of the clothing are detected at such a high sampling rate that a plurality of condition data is obtained during a clothing circulation.

Vorteilhafterweise wird gleichzeitig der Bespannungsumlauf erfasst. Dabei kann dieser Bespannungsumlauf beispielsweise über eine Wegmessung oder über eine Zeitmessung und/oder dergleichen erfasst werden. Aus der Zeitmessung und der Geschwindigkeit kann beispielsweise auch die Dehnung berechnet werden. Eine solche Dehnung der Bespannung kann zusätzlich als Trigger für die Zeit herangezogen werden. Überdies kann die Bespannung z.B. auch über wenigstens eine an oder in der Bespannung vorgesehene Markierung und die Messung eines entsprechenden Triggersignals erfasst werden.Advantageously, the clothing circulation is detected at the same time. In this case, this clothing circulation can be detected, for example, via a travel measurement or via a time measurement and / or the like. From the time measurement and the speed, for example, also the strain can be calculated. Such an expansion of the clothing can additionally be used as a trigger for the time. Moreover, the covering can be detected, for example, via at least one marking provided on or in the covering and the measurement of a corresponding trigger signal.

Das zumindest zweidimensionale Abbild des Bespannungszustandes wird vorzugsweise aus Zustandsdaten erstellt, die mittels wenigstens einer jeweils über die Dauer mehrerer Bespannungsumläufe erfolgenden Querabtastung der Bespannung erfasst wurden.The at least two-dimensional image of the clothing condition is preferably created from condition data which has been recorded by means of at least one transverse scanning of the clothing over the duration of a plurality of clothing revolutions.

Um das "wahre" Abbild der Bespannung zu erhalten bzw. um das Messrauschen zu reduzieren, kann das zumindest zweidimensionale Abbild des Bespannungszustandes aus Zustandsdaten erstellt werden, die mittels mehrerer Querabtastungen erfasst und vorzugsweise gemittelt und/oder gefiltert wurden.In order to obtain the "true" image of the clothing or to reduce the measurement noise, the at least two-dimensional image of the clothing condition can be created from condition data which has been acquired by means of several transverse scans and preferably averaged and / or filtered.

Das zweidimensionale Abbild der Bespannung erlaubt auch dann entsprechende Rückschlüsse auf den Bespannungszustand, wenn sich dieser Bespannungszustand nur auf kleinem Raum verändert hat, und diese Änderungen mit den herkömmlichen Messverfahren nicht mehr erfassbar wären.The two-dimensional image of the clothing allows corresponding conclusions to be drawn about the condition of the clothing even if this clothing condition has changed only in a small space, and these changes would no longer be detectable with the conventional measuring methods.

Grundsätzlich kann als Scanner eine Zustandssensorik mit einem oder mehreren Sensoren eingesetzt werden. Gemäß einer praktischen Ausgestaltung des erfindungsgemäßen Verfahrens wird als Scanner eine Zustandsensorik mit mehreren in Maschinenquerrichtung aufeinanderfolgenden Sensoren eingesetzt. Es können gleiche oder verschiedene Zustandsdaten erfasst werden.Basically, a state sensor with one or more sensors can be used as a scanner. According to a practical embodiment of the method according to the invention, a state sensor system with a plurality of consecutive sensors in the cross-machine direction is used as the scanner. The same or different status data can be detected.

Als Bespannungsmarkierung kann z.B. eine Marke, ein insbesondere eingewebter oder eingelegter Draht, eine Lochmarkierung, eine Farbmarkierung und/oder dergleichen vorgesehen sein.As a stringing mark, e.g. a mark, a particular woven or inlaid wire, a punch mark, a color mark and / or the like may be provided.

Zur Messung des Triggersignals kann wenigstens ein auf die Bespannungsmarkierung ansprechender Triggersensor eingesetzt werden.For measuring the trigger signal, at least one triggering sensor responding to the clothing marking can be used.

In bestimmten Fällen ist es auch von Vorteil, wenn auf beiden Seiten der Papier- bzw. Kartonmaschine jeweils wenigstens ein Triggersensor eingesetzt wird. Damit kann beispielsweise auch eine schräglaufende Filznaht (Filzverspannung) nachvollzogen werden, und es kann beispielsweise eine Farbkarte auch dann relativ zur Filznaht gezeichnet werden, wenn diese schräg verläuft.In certain cases, it is also advantageous if in each case at least one trigger sensor is used on both sides of the paper or board machine. Thus, for example, a skewed felt seam (felt bracing) can be traced, and it can, for example, a color chart are drawn relative to the felt seam, if this runs obliquely.

Bei den zu erfassenden Zustandsdaten kann es sich z.B. um eine oder mehrere der folgenden Größen handeln: Wasseraufnahmevermögen, Wassergehalt, optische Eigenschaften, Temperatur, Kompressibilität (Elastizität), Dicke, Verschmutzung, Dämpfung und/oder dergleichen.The state data to be acquired may be, for example, one or more of the following variables: water absorption capacity, water content, optical Properties, temperature, compressibility (elasticity), thickness, contamination, damping and / or the like.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:

Figur 1
eine schematische Darstellung einer Einrichtung zur Überwachung des Zustandes einer umlaufenden Bespannung, hier z.B. eines Filzes, und
Figur 2
ein zweidimensionales (z.B. farbiges) Abbild des Bespannungszustandes, hier z.B. der Permeabilität eines Filzes.
The invention will be explained in more detail below with reference to an embodiment with reference to the drawing; in this show:
FIG. 1
a schematic representation of a device for monitoring the state of a revolving string, here for example a felt, and
FIG. 2
a two-dimensional (eg colored) image of the state of clothing, here for example the permeability of a felt.

Figur 1 zeigt in schematischer Darstellung eine Einrichtung 10 zur Überwachung des Zustandes einer in einer Papier- oder Kartonmaschine eingesetzten umlaufenden Bespannung, hier beispielsweise eines Filzes 12. FIG. 1 shows a schematic representation of a device 10 for monitoring the state of a used in a paper or board machine circumferential string, here for example a felt 12th

Die Einrichtung 10 umfasst eine Zustandssensorik oder Scanner 14 zur Erfassung von Zustandsdaten des Filzes 12 und eine Auswerteeinheit 16 zum Erstellen eines zumindest zweidimensionalen Abbildes des Filzzustandes aus den erfassten Zustandsdaten, das sowohl den Zustandsverlauf in Maschinenlaufrichtung als auch den Zustandsverlauf in Maschinenquerrichtung wiedergibt. Die Auswerteeinheit 16 kann insbesondere einen Rechner und/oder dergleichen umfassen. Der Filz 12 ist um mehrere Walzen 18 geführt.The device 10 comprises a state sensor or scanner 14 for detecting state data of the felt 12 and an evaluation unit 16 for producing an at least two-dimensional image of the felt state from the acquired state data representing both the state progression in the machine direction and the state progression in the cross machine direction. The evaluation unit 16 may in particular comprise a computer and / or the like. The felt 12 is guided around a plurality of rollers 18.

Die über die Zustandssensorik 14 erfassten Zustandsdaten können repräsentativ für zumindest eine vorgebbare Eigenschaft des Filzes, z.B. Permeabilität, sein.The state data acquired via the state sensor system 14 can be representative of at least one predefinable property of the felt, e.g. Permeability, be.

Das z.B. farbige Abbild des Filzzustandes kann insbesondere so erstellt werden, dass dieser Filzzustand nach einer Art einer Landkarte wiedergegeben wird. Dabei kann der Zustandsverlauf in Maschinenlaufrichtung und der Zustandsverlauf in Maschinenquerrichtung z.B. in Form von Quelllinien und/oder Fahrübergängen wiedergegeben werden. Ein solches zweidimensionales Abbild des Filzzustandes, hier der Filz-Permeabilität, ist in der Figur 2 wiedergegeben. Es sind verschiedene Skalierungen denkbar, im vorliegenden Fall z.B. Filzlänge (0 % bis 100 %).The example colored image of the felt state can be created in particular so that this felt state is reproduced on a kind of map. there For example, the state progression in the machine direction and the state progression in the cross machine direction, for example in the form of source lines and / or drive transitions, can be reproduced. Such a two-dimensional image of the felt state, here the felt permeability, is in the FIG. 2 played. There are different scales conceivable, in the present case, for example, felt length (0% to 100%).

Die Zustandssensorik 14 kann einen oder mehrere Sensoren umfassen. Sie wird in Maschinenquerrichtung CD bewegt.The condition sensor 14 may include one or more sensors. It is moved in the cross-machine direction CD.

Der Filzumlauf wird über wenigstens eine an oder in dem Filz 12 vorgesehene Markierung 20 und die Messung eines entsprechenden Triggersignals mittels eines Triggersensors 22 erfasst.The felt circulation is detected via at least one marking 20 provided on or in the felt 12 and the measurement of a corresponding trigger signal by means of a trigger sensor 22.

Die Auswerteeinheit 16 ist insbesondere für eine Messwerterfassung für die Position der Zustandssensorik 14 in Maschinenquerrichtung, die Qualitäts- oder Eigenschaftssignale und das Triggersignal sowie zur Berechnung des zweidimensionalen Abbildes (vgl. auch Figur 2) des Filzes 12 ausgelegt. Dabei kann die betreffende Darstellung beispielsweise unabhängig von der Längendehnung des Filzes 12 sein.The evaluation unit 16 is in particular for a measured value detection for the position of the state sensor system 14 in the cross-machine direction, the quality or property signals and the trigger signal as well as for the calculation of the two-dimensional image (see also FIG. 2 ) of the felt 12. In this case, the relevant representation, for example, be independent of the elongation of the felt 12.

Der umlaufende Filz 12 wird mittels der Zustandssensorik 14 z.B. in Maschinenquerrichtung abgetastet. Die Zustandssensorik 14 kann also insbesondere einen Scanner oder dergleichen umfassen. Die Querabtastung erfolgt bei laufendem Filz 12.The circulating felt 12 is conveyed by means of the condition sensor 14, e.g. scanned in the cross machine direction. The state sensor system 14 may thus include in particular a scanner or the like. The transverse scanning takes place while the felt 12 is running.

Dabei fährt die Zustandssenorik 14 bzw. der Scanner sehr langsam über die Bespannung, hier beispielsweise den Filz 12. Eine Traversierung bzw. ein Scan-Vorgang dauert mehrere Minuten und entspricht m Filzumläufen. Die Zustandsdaten des Filzes 12 werden kontinuierlich mit einer sehr hohen Abtastrate erfasst, so dass während eines Filzumlaufes z.B. n Werte aufgenommen werden. Der Filzumlauf wird gleichzeitig über eine Wegmessung, oder einfacher über eine Markierung 20 (vgl. Figur 1) am Filz 12 und ein über einen Triggersensor 22 (vgl. Figur 1) gemessenes Triggersignal erfasst.In this case, the state sensor 14 or the scanner moves very slowly over the clothing, here for example the felt 12. A traversing or a scanning process takes several minutes and corresponds to m felt cycles. The state data of the felt 12 are recorded continuously at a very high sampling rate, so that, for example, n values are recorded during a felt circulation. Of the Filzumlauf is simultaneously via a displacement measurement, or more easily via a marker 20 (see. FIG. 1 ) on the felt 12 and a via a trigger sensor 22 (see. FIG. 1 ) detected trigger signal detected.

Nach einem Scan-Vorgang stehen dann m · n Messwerte zur Verfügung, die m Filzumläufen zugeordnet sind. Aus diesen m · n Werten sowie der Trigger-Information (oder der Wegmessung) lässt sich somit beispielsweise eine gewünschte Farbkarte zeichnen, die entsprechend m Werte in Maschinenlaufrichtung und n Werte in Maschinenquerrichtung enthält.After a scan process, there are then m · n measured values available that are associated with m felt cycles. It is thus possible, for example, to draw a desired color chart from these mn values and the trigger information (or the distance measurement), which contains m values in the machine direction and n values in the cross machine direction corresponding to m.

Um das "wahre" Abbild des Filzes 12 zu erhalten bzw. um das Messrauschen zu reduzieren, können mehrere Scan-Vorgänge durchgeführt und die betreffenden Werte aufgenommen sowie gemittelt oder gefiltert werden. So erhält man beispielsweise für einen bestimmten Ort auf dem Filz 12 nach dem Scan-Vorgang k einen angezeigten Messwert ak, der sich aus der im folgenden wiedergegebenen Formel aus dem aktuellen Messwert mk und dem letzten angezeigten Messwert ak-1 ergibt: ak = 0,2 mk + 0,8 ak-1.In order to obtain the "true" image of the felt 12 or to reduce the measuring noise, several scanning processes can be carried out and the relevant values recorded and averaged or filtered. Thus, for example, for a particular location on the felt 12 after the scan process k, a displayed measurement value a k is obtained , which results from the formula reproduced below from the current measured value m k and the last displayed measured value a k-1 : a k = 0.2 m k + 0.8 a k-1 .

Grundsätzlich sind auch beliebige andere Filterformeln denkbar.In principle, any other filter formulas are conceivable.

Die Zustandssensorik 14 kann einen oder mehrere, beispielsweise in Maschinenquerrichtung aufeinanderfolgende Sensoren umfassen.The state sensor 14 may comprise one or more, for example in the cross-machine direction consecutive sensors.

Als Bespannungsmarkierung 20 kann beispielsweise eine Marke, ein insbesondere eingewebter oder eingelegter Draht, eine Lochmarkierung, eine Farbmarkierung und/oder dergleichen vorgesehen.For example, a mark, in particular a woven or inlaid wire, a punch mark, a color mark and / or the like may be provided as the clothing mark 20.

Grundsätzlich können auch auf beiden Seiten der Maschine Triggersensoren 22 vorgesehen sein. Damit kann auch eine schräglaufende Filznaht (Filzverspannung) nachvollzogen werden, und es kann die Farbkarte (vgl. Figur 2) auch dann relativ zur Filznaht gezeichnet werden, wenn die Filznaht schräg verläuft.In principle, trigger sensors 22 can also be provided on both sides of the machine. This can also be a skewed felt seam (felt bracing) be reconstructed, and it can the color chart (see. FIG. 2 ) are then drawn relative to the felt seam, if the felt seam runs obliquely.

Die in dem zweidimensionalen Abbild der Figur 2 vorgesehenen Skalierungen sind rein beispielhaft. Es können beide Skalierungen insbesondere auch örtlich sein:

  • x = Filz-Länge in %
  • y = Filz-Breite in mm
The in the two-dimensional image of the FIG. 2 provided scalings are purely exemplary. Both scales can be local in particular:
  • x = felt length in%
  • y = felt width in mm

Die Filz-Länge ist relativ zur Position des Triggersignals gemessen. Die Position des Triggersignals relativ zur Filznaht sollte bekannt sein. Idealerweise sind diese Positionen identisch.The felt length is measured relative to the position of the trigger signal. The position of the trigger signal relative to the felt seam should be known. Ideally, these positions are identical.

Eine mögliche Alternative besteht in folgendem:

  • x = Filz-Länge in mm
  • y = Filz-Breite in mm
One possible alternative is the following:
  • x = felt length in mm
  • y = felt width in mm

In diesem Fall nimmt die Filz-Länge mit der Zeit zwar zu. Der Vorteil besteht jedoch darin, dass eine Längenänderung sichtbar bleibt.In this case, the felt length increases with time. The advantage, however, is that a change in length remains visible.

Als weiteres Beispiel sei die Filzbreite in % z.B. mit Bahnkantenabtastung, z.B. optisch oder induktiv, genannt.As another example, the felt width in% is e.g. with web edge scan, e.g. optical or inductive, called.

Es kann somit also beispielsweise ein zweidimensionales Abbild des Bespannungszustandes erstellt werden, das die Bespannungseigenschaften nach Art einer Landkarte zeigt. Die Darstellung der Eigenschaften in Maschinenlaufrichtung und in Maschinenquerrichtung kann z.B. in Form von Höhenlinien oder Farbübergängen, z.B. ähnlich wie bei Landkarten, erfolgen. Grundsätzlich sind auch dreidimensionale Ansichten wie z.B. räumliche Gitter, Wasserfalldarstellungen, und/oder dergleichen, denkbar.Thus, it is thus possible, for example, to create a two-dimensional image of the clothing condition which shows the clothing properties in the manner of a map. The representation of the properties in the machine direction and in the cross machine direction, for example, in the form of contour lines or color transitions, for example, similar to maps done. Basically, are also three-dimensional Views such as spatial grid, waterfall representations, and / or the like, conceivable.

Das zweidimensionale Abbild der Bespannung, z.B. Filz oder Sieb, erlaubt auch dann Rückschlüsse auf den Bespannungszustand, wenn der Zustand nur kleinräumig verändert ist und eine solche Änderung mit den herkömmlichen Messmethoden nicht mehr erfassbar wäre. Das zweidimensionale Abbild kann auch mit Papier- oder Kartoneigenschaften korreliert werden, um feststellen zu können, ob die kleinräumigen Zustandsunterschiede in der Bespannung sich auf die Papier- bzw. Kartonqualität auswirken. Ähnliche Betrachtungen ergeben sich auch bei einer Anwendung der Erfindung bei anderen Bespannungen (z.B. Formiersiebe) oder der Verwendung anderer Sensoren (z.B. Durchlässigkeitsmessung, usw.).The two-dimensional image of the clothing, eg felt or sieve, also allows conclusions to be drawn about the condition of the clothing, if the condition is only changed in a small scale and such a change would no longer be detectable with the conventional measuring methods. The two-dimensional image can also be correlated with paper or paperboard properties to determine if the small-area state differences in the fabric affect paper or board quality. Similar considerations also arise in an application of the invention to other clothing (eg forming fabrics) or the use of other sensors (eg permeability measurement, etc.).

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
EinrichtungFacility
1212
Bespannung, FilzCovering, felt
1414
Zustandssensorik, ScannerCondition sensor, scanner
1616
Auswerteeinheitevaluation
1818
Walzeroller
2020
Markierungmark
2222
Triggersensortrigger sensor

Claims (21)

  1. Method for monitoring the condition of a revolving fabric (12) used in a paper or board machine, for example a felt or wire, in which condition data about the fabric (12) are registered by means of condition sensors (14) and an at least two-dimensional image of the fabric condition is created by means of an evaluation unit (16) by using the condition data registered, which image reproduces both the variation of the condition in the machine running direction and the variation of the condition in the cross-machine direction, the fabric (12) being scanned in the cross-machine direction, characterized in that the transverse scanning is carried out by means of a scanner (14) and in that the at least two-dimensional image of the fabric condition is correlated with at least one predefinable property of the paper or board web.
  2. Method according to Claim 1, characterized in that the condition data are representative of at least one predefinable property of the fabric (12).
  3. Method according to Claim 1 or 2, characterized in that the image of the fabric condition is created in such a way that the latter is reproduced in the manner of a map.
  4. Method according to one of the preceding claims, characterized in that the variation of the condition in the machine running direction and the variation of the condition in the cross-machine direction are reproduced in the form of vertical lines and/or colour changes.
  5. Method according to one of the preceding claims, characterized in that a three-dimensional image or view of the fabric condition is created, for example in the form of a three-dimensional grid, a three-dimensional waterfall illustration and/or the like.
  6. Method according to one of the preceding claims, characterized in that the transverse scanning is carried out over a number of minutes.
  7. Method according to one of the preceding claims, characterized in that the transverse scanning is carried out over the duration of at least one fabric revolution.
  8. Method according to one of the preceding claims, characterized in that the transverse scanning is carried out over the duration of a number of fabric revolutions.
  9. Method according to one of the preceding claims, characterized in that the condition data about the fabric (12) are registered continually at a predefinable scanning rate.
  10. Method according to one of the preceding claims, characterized in that the condition data about the fabric (12) are registered at a scanning rate which is so high that a plurality of condition data accumulates during one fabric revolution.
  11. Method according to one of the preceding claims, characterized in that the fabric revolution is registered at the same time.
  12. Method according to Claim 11, characterized in that the fabric revolution is registered via a distance measurement.
  13. Method according to Claim 11, characterized in that the fabric revolution is registered via a time measurement and/or the like.
  14. Method according to Claim 11, characterized in that the fabric revolution is registered via at least one marking (20) provided on or in the fabric and the measurement of a corresponding trigger signal.
  15. Method according to one of the preceding claims, characterized in that the at least two-dimensional image of the fabric condition is created from condition data which have been registered by means of at least one transverse scan of the fabric carried out in each case over the duration of a plurality of fabric revolutions.
  16. Method according to one of the preceding claims, characterized in that the at least two-dimensional image of the fabric condition is created from condition data which have been registered by means of a plurality of transverse scans and have preferably been averaged and/or filtered.
  17. Method according to one of the preceding claims, characterized in that condition sensors (14) having at least one sensor are used as the scanner.
  18. Method according to Claim 17, characterized in that condition sensors (14) having a plurality of sensors following one another in the cross-machine direction are used as the scanner.
  19. Method according to one of the preceding claims, characterized in that the fabric marking (20) provided is an optical marking, a wire in particular woven in, a perforation marking and/or the like.
  20. Method according to one of Claims 14 to 19, characterized in that, in order to measure the trigger signal, use is made of at least one trigger sensor (22) responding to the fabric marking (20).
  21. Method according to Claim 20, characterized in that at least one trigger sensor (22) is used in each case on both sides of the paper or board machine.
EP03103684A 2002-10-23 2003-10-06 Method for monitoring the condition of a clothing Expired - Lifetime EP1413674B1 (en)

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DE10249385 2002-10-23
DE10249385A DE10249385A1 (en) 2002-10-23 2002-10-23 Method and device for monitoring the condition of a covering

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US7294234B2 (en) 2007-11-13
DE10249385A1 (en) 2004-05-06
EP1413674A1 (en) 2004-04-28
US20040129398A1 (en) 2004-07-08
ATE386159T1 (en) 2008-03-15
DE50309148D1 (en) 2008-03-27

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