EP1413674A1 - Method and apparatus for monitoring the condition of a clothing - Google Patents
Method and apparatus for monitoring the condition of a clothing Download PDFInfo
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- EP1413674A1 EP1413674A1 EP03103684A EP03103684A EP1413674A1 EP 1413674 A1 EP1413674 A1 EP 1413674A1 EP 03103684 A EP03103684 A EP 03103684A EP 03103684 A EP03103684 A EP 03103684A EP 1413674 A1 EP1413674 A1 EP 1413674A1
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 40
- 230000003287 optical effect Effects 0.000 claims abstract description 3
- 238000005259 measurement Methods 0.000 claims description 17
- 230000004087 circulation Effects 0.000 claims description 9
- 239000000123 paper Substances 0.000 claims description 9
- 238000011156 evaluation Methods 0.000 claims description 8
- 239000011111 cardboard Substances 0.000 claims description 6
- 239000011087 paperboard Substances 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 5
- 230000000875 corresponding effect Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000004744 fabric Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000035699 permeability Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- 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 and a device for monitoring the condition of a rotating fabric used in a paper or board machine, e.g. Felt or sieve.
- the invention has for its object to provide a method and a device of the type mentioned with which an optimal representation of the clothing properties is possible both in the machine direction and in the cross machine direction.
- This object is achieved according to the invention by a method for monitoring the condition of a circumferential covering used in a paper or board machine, e.g. Felt or sieve, in which state data of the covering are recorded by means of a state sensor system and an at least two-dimensional image of the covering state is created from the recorded state data by means of an evaluation unit, which reproduces both the state curve in the machine running direction and the state curve in the machine transverse direction. In contrast to the state of the art, this is about the condition of the covering.
- the status data are preferably representative of at least one specifiable property of the covering.
- the image of the covering state can in particular be created in such a way that this covering state is reproduced in the manner of a map.
- the state curve in the machine running direction and the state curve in the machine cross direction are reproduced in the form of contour lines and / or color transitions.
- a three-dimensional image or view of the covering state can also be created, for example in the form of a spatial grid, a spatial waterfall display and / or the like.
- the covering is advantageously scanned in the cross-machine direction.
- Such a cross scan can be done in particular by means of a scanner.
- the cross-scan can take place over several minutes and preferably over the duration of at least one covering cycle. According to a preferred practical embodiment, the cross-scanning takes place over the duration of several covering cycles.
- the scanner can therefore be moved very slowly over the covering, so that a scanning process, for example, takes several minutes or corresponds to one or more covering cycles.
- the status data of the clothing can be recorded continuously with a predefinable sampling rate.
- the status data of the clothing are preferably recorded at such a high sampling rate that a plurality of status data is obtained during one clothing revolution.
- the clothing circulation is recorded at the same time.
- this clothing circulation can be detected, for example, by means of a distance measurement or via a time measurement and / or the like.
- the stretch can also be calculated from the time measurement and the speed, for example.
- Such a stretching of the covering can also be used as a trigger for the time.
- the covering can also be detected, for example, by means of 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 covering state is preferably created from state data which were recorded by means of at least one cross-scanning of the covering over the duration of several covering cycles.
- the at least two-dimensional image of the fabric state can be created from status data that were recorded by means of several cross-scans and preferably averaged and / or filtered.
- the two-dimensional image of the covering also allows corresponding conclusions to be drawn about the covering state if this covering state has changed only in a small space and these changes would no longer be detectable with the conventional measuring methods.
- the at least two-dimensional image of the covering state can be correlated with at least one specifiable property of the paper or cardboard web.
- a state sensor system with one or more sensors can be used.
- a state sensor system with a plurality of sensors which follow one another in the machine transverse direction and / or with a plurality of sensors which follow one another in the transverse direction is used.
- the same or different status data can be recorded.
- a covering marking e.g. a mark, in particular a wire woven or inserted, a hole marking, a color marking and / or the like can be provided.
- At least one trigger sensor which responds to the clothing marking can be used to measure the trigger signal.
- At least one trigger sensor is used on both sides of the paper or board machine.
- an oblique felt seam (felt tension) can also be traced, and for example a color chart can also be drawn relative to the felt seam if it runs obliquely.
- the scanner or the state sensor system can in particular also be assigned several state sensors, as a result of which the measurement time is reduced while the measurement resolution remains the same.
- a device for monitoring the state of a rotating covering used in a paper or board machine in particular for carrying out the method according to one of the preceding claims, with a state sensor system for detecting state data of the covering and an evaluation unit for Creation of an at least two-dimensional image of the covering state from the acquired state data, which reproduces both the state course in the machine running direction and the state course in the machine transverse direction.
- the condition data to be recorded can 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 circumferential covering used in a paper or board machine, here for example a felt 12.
- the device 10 comprises a state sensor system or scanner 14 for recording state data of the felt 12 and an evaluation unit 16 for creating an at least two-dimensional image of the felt state from the recorded state data, which reproduces both the state course in the machine running direction and the state course in the machine transverse direction.
- the evaluation unit 16 can 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.
- the colored image of the felt condition for example, can in particular be created in such a way that this felt condition is reproduced as a kind of map.
- this felt condition is reproduced as a kind of map.
- the state curve in the machine running direction and the state curve in the cross machine direction can be reproduced, for example, in the form of source lines and / or driving transitions.
- Such a two-dimensional image of the felt condition, here the felt permeability is shown in FIG. 2. Different scales are conceivable, in the present case, for example, felt length (0% to 100%).
- the state sensor system 14 can comprise 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 designed, in particular, for a measurement value acquisition for the position of the state sensors 14 in the cross-machine direction, the quality or property signals and the trigger signal, and for calculating the two-dimensional image (cf. also FIG. 2) of the felt 12.
- the representation in question can be independent of the longitudinal expansion of the felt 12, for example.
- the circulating felt 12 is e.g. scanned in the cross machine direction.
- the condition sensor system 14 can 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 covering, here, for example, the felt 12.
- a traversing or a scanning process takes several minutes and corresponds to m felt revolutions.
- the condition data of the felt 12 are continuously recorded at a very high sampling rate, so that, for example, n values are recorded during a felt cycle.
- the Felt circulation is detected simultaneously via a path measurement, or more simply via a marker 20 (cf. FIG. 1) on the felt 12 and a trigger signal measured via a trigger sensor 22 (cf. FIG. 1).
- m ⁇ n measurement values are then available, which are assigned to m felt circulations. From these m ⁇ n values and the trigger information (or the path measurement), for example, a desired color card can be drawn, which accordingly contains m values in the machine direction and n values in the cross machine direction.
- the state sensor system 14 can comprise one or more sensors, for example successive ones in the cross-machine direction.
- a marking in particular a wire woven or inserted, a hole marking, a color marking and / or the like can be provided as the covering marking 20.
- trigger sensors 22 can also be provided on both sides of the machine. This means that an inclined felt seam (felt tension) can be traced, and the color chart (see FIG. 2) can also be drawn relative to the felt seam if the felt seam runs obliquely.
- 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 length of the felt increases over time.
- the advantage is that a change in length remains visible.
- felt width in% e.g. with web edge scanning, e.g. optically or inductively called.
- a two-dimensional image of the covering condition can be created, which shows the covering properties in the manner of a map.
- the properties in the machine direction and in the machine cross direction can be displayed, for example, in the form of contour lines or color transitions, for example similar to maps. Basically, they are also three-dimensional Views such as spatial grids, waterfall displays, and / or the like are conceivable.
- the two-dimensional image of the covering also allows conclusions to be drawn about the covering condition if the condition is only changed over a small area 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 cardboard properties in order to be able to determine whether the small-scale state differences in the covering affect the paper or cardboard quality. Similar considerations also result when the invention is used with other fabrics (eg forming fabrics) or when using other sensors (eg permeability measurement, etc.).
Abstract
Description
Die Erfindung betrifft ein Verfahren sowie eine Einrichtung zur Überwachung des Zustandes einer in einer Papier- oder Kartonmaschine eingesetzten umlaufenden Bespannung, z.B. Filzes oder Siebes.The invention relates to a method and a device for monitoring the condition of a rotating fabric used in a paper or board machine, e.g. Felt or sieve.
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.Sensors are already being used which are moved across the clothing of a paper machine in a cross-machine direction (CD) in order to scan it. In this way, for example, moisture cross profiles of press felts are measured. So far, around 100 to 1000 measured values across the web width have been recorded in one scan. As the covering, e.g. a felt that circulates several times shows an average moisture cross profile of the entire felt. However, differences in the felt condition 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", press release dated June 4, 2002, already specifies a fullsheet moisture measurement method with which a separation of changes in the machine direction and in the transverse direction is achieved. In "ipw 11/2001", page 27, a web scanner for online determination of the moisture cross profile of a material web, in particular a paper or cardboard web, is specified over the full web width immediately after the press section.
Der bisherige Stand der Technik ist ausschließlich mit Eigenschaften der Materialbahn befasst.The previous state of the art deals exclusively with properties of the material web.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren sowie eine Einrichtung der eingangs genannten Art zu schaffen, mit denen eine optimale Darstellung der Bespannungseigenschaften sowohl in Maschinenlaufrichtung als auch in Maschinenquerrichtung möglich ist.The invention has for its object to provide a method and a device of the type mentioned with which an optimal representation of the clothing properties is possible both in the machine direction and in the cross machine direction.
Diese Aufgabe wird nach der Erfindung gelöst durch 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. Anders als beim Stand der Technik geht es hier also um den Zustand der Bespannung.This object is achieved according to the invention by a method for monitoring the condition of a circumferential covering used in a paper or board machine, e.g. Felt or sieve, in which state data of the covering are recorded by means of a state sensor system and an at least two-dimensional image of the covering state is created from the recorded state data by means of an evaluation unit, which reproduces both the state curve in the machine running direction and the state curve in the machine transverse direction. In contrast to the state of the art, this is about the condition of the covering.
Die Zustandsdaten sind vorzugsweise repräsentativ für zumindest eine vorgebbare Eigenschaft der Bespannung.The status data are preferably representative of at least one specifiable property of the covering.
Das Abbild des Bespannungszustandes kann insbesondere so erstellt werden, dass dieser Bespannungszustand nach Art einer Landkarte wiedergegeben wird.The image of the covering state can in particular be created in such a way that this covering state 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 curve in the machine running direction and the state curve in the machine cross 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 covering state can also be created, for example in the form of a spatial grid, a spatial waterfall display and / or the like.
Vorteilhafterweise wird die Bespannung in Maschinenquerrichtung abgetastet. Eine solche Querabtastung kann insbesondere mittels eines Scanners erfolgen.The covering is advantageously scanned in the cross-machine direction. Such a cross scan can be done in particular by means of a scanner.
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 cross-scan can take place over several minutes and preferably over the duration of at least one covering cycle. According to a preferred practical embodiment, the cross-scanning takes place over the duration of several covering 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 covering, so that a scanning process, for example, takes several minutes or corresponds to one or more covering cycles.
Die Zustandsdaten der Bespannung können kontinuierlich mit einer vorgebbaren Abtastrate erfasst werden.The status data of the clothing can be recorded 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.The status data of the clothing are preferably recorded at such a high sampling rate that a plurality of status data is obtained during one clothing revolution.
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 recorded at the same time. In this case, this clothing circulation can be detected, for example, by means of a distance measurement or via a time measurement and / or the like. The stretch can also be calculated from the time measurement and the speed, for example. Such a stretching of the covering can also be used as a trigger for the time. In addition, the covering can also be detected, for example, by means of 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 covering state is preferably created from state data which were recorded by means of at least one cross-scanning of the covering over the duration of several covering cycles.
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 fabric or to reduce the measurement noise, the at least two-dimensional image of the fabric state can be created from status data that were recorded by means of several cross-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 covering also allows corresponding conclusions to be drawn about the covering state if this covering state has changed only in a small space and these changes would no longer be detectable with the conventional measuring methods.
Um beispielsweise feststellen zu können, ob die kleinräumigen Zustandsunterschiede in der Bespannung sich auf die Papier- oder Kartonqualität auswirken, kann das zumindest zweidimensionale Abbild des Bespannungszustandes mit wenigstens einer vorgebbaren Eigenschaft der Papier- bzw. Kartonbahn korreliert werden.In order to be able to determine, for example, whether the small-scale state differences in the covering have an effect on the paper or cardboard quality, the at least two-dimensional image of the covering state can be correlated with at least one specifiable property of the paper or cardboard web.
Grundsätzlich kann eine Zustandssensorik mit einem oder mehreren Sensoren eingesetzt werden. Gemäß einer praktischen Ausgestaltung des erfindungsgemäßen Verfahrens wird eine Zustandsensorik mit mehreren in Maschinenquerrichtung aufeinanderfolgenden Sensoren und/oder mit mehreren in Querrichtung aufeinander folgenden Sensoren eingesetzt. Es können gleiche oder verschiedene Zustandsdaten erfasst werden.In principle, a state sensor system with one or more sensors can be used. According to a practical embodiment of the method according to the invention, a state sensor system with a plurality of sensors which follow one another in the machine transverse direction and / or with a plurality of sensors which follow one another in the transverse direction is used. The same or different status data can be recorded.
Als Bespannungsmarkierung kann z.B. eine Marke, ein insbesondere eingewebter oder eingelegter Draht, eine Lochmarkierung, eine Farbmarkierung und/oder dergleichen vorgesehen sein.As a covering marking e.g. a mark, in particular a wire woven or inserted, a hole marking, a color marking and / or the like can be provided.
Zur Messung des Triggersignals kann wenigstens ein auf die Bespannungsmarkierung ansprechender Triggersensor eingesetzt werden.At least one trigger sensor which responds to the clothing marking can be used to measure the trigger signal.
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 at least one trigger sensor is used on both sides of the paper or board machine. In this way, for example, an oblique felt seam (felt tension) can also be traced, and for example a color chart can also be drawn relative to the felt seam if it runs obliquely.
Dem Scanner bzw. der Zustandssensorik können insbesondere auch mehrere Zustandssensoren zugeordnet sein, wodurch bei gleichbleibender Messauflösung die Messzeit reduziert wird.The scanner or the state sensor system can in particular also be assigned several state sensors, as a result of which the measurement time is reduced while the measurement resolution remains the same.
Die eingangs angegebene Aufgabe wird erfindungsgemäß auch gelöst durch eine Einrichtung zur Überwachung des Zustandes einer in einer Papier- oder Kartonmaschine eingesetzten umlaufenden Bespannung, insbesondere zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, mit einer Zustandssensorik zur Erfassung von Zustandsdaten der Bespannung und einer Auswerteeinheit zum Erstellen eines zumindest zweidimensionalen Abbildes des Bespannungszustandes aus den erfassten Zustandsdaten, das sowohl den Zustandsverlauf in Maschinenlaufrichtung als auch den Zustandsverlauf in Masch i-nenquerrichtung wiedergibt.The object specified at the outset is also achieved according to the invention by a device for monitoring the state of a rotating covering used in a paper or board machine, in particular for carrying out the method according to one of the preceding claims, with a state sensor system for detecting state data of the covering and an evaluation unit for Creation of an at least two-dimensional image of the covering state from the acquired state data, which reproduces both the state course in the machine running direction and the state course in the machine transverse direction.
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 condition data to be recorded can 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.
- Figure 1
- a schematic representation of a device for monitoring the state of a circumferential covering, here for example a felt, and
- Figure 2
- a two-dimensional (eg colored) image of the covering condition, 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
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
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
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 colored image of the felt condition, for example, can in particular be created in such a way that this felt condition is reproduced as a kind of map. there the state curve in the machine running direction and the state curve in the cross machine direction can be reproduced, for example, in the form of source lines and / or driving transitions. Such a two-dimensional image of the felt condition, here the felt permeability, is shown in FIG. 2. Different scales are 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
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
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
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 e.g. scanned in the cross machine direction. The
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.The
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 scanning process, m · n measurement values are then available, which are assigned to m felt circulations. From these m · n values and the trigger information (or the path measurement), for example, a desired color card can be drawn, which accordingly contains m values in the machine direction and n values in the cross machine direction.
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 measurement noise, several scanning processes can be carried out and the relevant values can be recorded, averaged or filtered. For example, for a specific location on the felt 12 after the scanning process k, a measured value a k is obtained , which results from the formula given 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 also conceivable.
Die Zustandssensorik 14 kann einen oder mehrere, beispielsweise in Maschinenquerrichtung aufeinanderfolgende Sensoren umfassen.The
Als Bespannungsmarkierung 20 kann beispielsweise eine Marke, ein insbesondere eingewebter oder eingelegter Draht, eine Lochmarkierung, eine Farbmarkierung und/oder dergleichen vorgesehen.A marking, in particular a wire woven or inserted, a hole marking, a color marking and / or the like can be provided as the covering marking 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,
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
- 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
- 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 length of the felt increases over 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.Another example is the felt width in% e.g. with web edge scanning, e.g. optically or inductively 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, for example, a two-dimensional image of the covering condition can be created, which shows the covering properties in the manner of a map. The properties in the machine direction and in the machine cross direction can be displayed, for example, in the form of contour lines or color transitions, for example similar to maps. Basically, they are also three-dimensional Views such as spatial grids, waterfall displays, and / or the like are 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 covering, such as felt or sieve, also allows conclusions to be drawn about the covering condition if the condition is only changed over a small area 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 cardboard properties in order to be able to determine whether the small-scale state differences in the covering affect the paper or cardboard quality. Similar considerations also result when the invention is used with other fabrics (eg forming fabrics) or when using other sensors (eg permeability measurement, etc.).
- 1010
- EinrichtungFacility
- 1212
- Bespannung, FilzCovering, felt
- 1414
- Zustandssensorik, ScannerCondition sensors, scanners
- 1616
- Auswerteeinheitevaluation
- 1818
- Walzeroller
- 2020
- Markierungmark
- 2222
- Triggersensortrigger sensor
Claims (26)
dadurch gekennzeichnet,
dass die Zustandsdaten repräsentativ für zumindest eine vorgebbare Eigenschaft der Bespannung (12) sind.Method according to claim 1,
characterized,
that the status data are representative of at least one specifiable property of the covering (12).
dadurch gekennzeichnet,
dass das Abbild des Bespannungszustandes so erstellt wird, dass dieser nach Art einer Landkarte wiedergegeben wird.Method according to claim 1 or 2,
characterized,
that the image of the covering condition is created so that it is displayed like a map.
dadurch gekennzeichnet,
dass der Zustandsverlauf in Maschinenlaufrichtung und der Zustandsverlauf in Maschinenquerrichtung in Form von Höhenlinien und/oder Farbübergängen wiedergegeben werden.Method according to one of the preceding claims,
characterized,
that the state course in the machine running direction and the state course in the cross machine direction in the form of contour lines and / or color transitions.
dadurch gekennzeichnet,
dass ein dreidimensionales Abbild oder Ansicht des Bespannungszustandes, z.B. in Form eines räumlichen Gitters, einer räumlichen Wasserfalldarstellung und/oder dergleichen, erstellt wird.Method according to one of the preceding claims,
characterized,
that a three-dimensional image or view of the covering state, for example in the form of a spatial grid, a spatial waterfall representation and / or the like, is created.
dadurch gekennzeichnet,
dass die Bespannung (12) in Maschinenquerrichtung abgetastet wird.Method according to one of the preceding claims,
characterized,
that the covering (12) is scanned in the cross-machine direction.
dadurch gekennzeichnet,
dass die Querabtastung mittels eines Scanners (14) erfolgt.Method according to claim 6,
characterized,
that the cross-scanning takes place by means of a scanner (14).
dadurch gekennzeichnet,
dass die Querabtastung über mehrere Minuten erfolgt.Method according to claim 6 or 7,
characterized,
that the cross-scan takes place over several minutes.
dadurch gekennzeichnet,
dass die Querabtastung über die Dauer wenigstens eines Bespannungsumlaufs erfolgt.Method according to one of the preceding claims,
characterized,
that the cross-scanning takes place over the duration of at least one clothing revolution.
dadurch gekennzeichnet,
dass die Querabtastung über die Dauer mehrerer Bespannungsumläufe erfolgt.Method according to one of the preceding claims,
characterized,
that the cross-scanning takes place over the duration of several covering cycles.
dadurch gekennzeichnet,
dass die Zustandsdaten der Bespannung (12) kontinuierlich mit einer vorgebbaren Abtastrate erfasst werden.Method according to one of the preceding claims,
characterized,
that the status data of the covering (12) are recorded continuously at a predefinable sampling rate.
dadurch gekennzeichnet,
dass die Zustandsdaten der Bespannung (12) mit einer derart hohen Abtastrate erfasst werden, dass während eines Bespannungsumlaufs eine Mehrzahl von Zustandsdaten anfällt.Method according to one of the preceding claims,
characterized,
that the status data of the covering (12) are recorded with such a high sampling rate that a plurality of status data is obtained during one covering cycle.
dadurch gekennzeichnet,
dass gleichzeitig der Bespannungsumlauf erfasst wird.Method according to one of the preceding claims,
characterized,
that the clothing circulation is recorded at the same time.
dadurch gekennzeichnet,
dass der Bespannungsumlauf über eine Wegmessung erfasst wird.A method according to claim 13,
characterized,
that the clothing circulation is recorded via a distance measurement.
dadurch gekennzeichnet,
dass der Bespannungsumlauf über eine Zeitmessung und/oder dergleichen erfasst wird.A method according to claim 13,
characterized,
that the clothing circulation is recorded via a time measurement and / or the like.
dadurch gekennzeichnet,
dass der Bespannungsumlauf über wenigstens eine an oder in der Bespannung vorgesehene Markierung (20) und die Messung eines entsprechenden Triggersignals erfasst wird.A method according to claim 13,
characterized,
that the clothing circulation is detected via at least one marking (20) provided on or in the clothing and the measurement of a corresponding trigger signal.
dadurch gekennzeichnet,
dass das zumindest zweidimensionale Abbild des Bespannungszustandes aus Zustandsdaten erstellt wird, die mittels wenigstens einer jeweils über die Dauer mehrerer Bespannungsumläufe erfolgenden Querabtastung der Bespannung erfasst wurden.Method according to one of the preceding claims,
characterized,
that the at least two-dimensional image of the covering state is created from state data that were acquired by means of at least one cross-scanning of the covering over the duration of several covering cycles.
dadurch gekennzeichnet,
dass das zumindest zweidimensionale Abbild des Bespannungszustandes aus Zustandsdaten erstellt wird, die mittels mehrerer Querabtastungen erfasst und vorzugsweise gemittelt und/oder gefiltert wurden.Method according to one of the preceding claims,
characterized,
that the at least two-dimensional image of the covering state is created from state data which were recorded by means of a plurality of transverse scans and preferably averaged and / or filtered.
dadurch gekennzeichnet,
dass das zumindest zweidimensionale Abbild des Bespannungszustandes mit wenigstens einer vorgebbaren Eigenschaft der Papier- bzw. Kartonbahn korreliert wird.Method according to one of the preceding claims,
characterized,
that the at least two-dimensional image of the covering state is correlated with at least one specifiable property of the paper or cardboard web.
dadurch gekennzeichnet,
dass eine Zustandssensorik (14) mit wenigstens einem Sensor eingesetzt wird.Method according to one of the preceding claims,
characterized,
that a state sensor system (14) is used with at least one sensor.
dadurch gekennzeichnet,
dass eine Zustandssensorik (14) mit mehreren in Maschinenquerrichtung aufeinander folgenden Sensoren und/oder mit mehreren in Querrichtung aufeinander folgenden Sensoren eingesetzt wird.A method according to claim 20,
characterized,
that a state sensor system (14) is used with a plurality of sensors which follow one another in the machine transverse direction and / or with a plurality of sensors which follow one another in the transverse direction.
dadurch gekennzeichnet,
dass als Bespannungsmarkierung (20) eine optische Markierung, ein insbesondere eingewebter Draht, eine Lochmarkierung und/oder dergleichen vorgesehen ist.Method according to one of the preceding claims,
characterized,
that an optical marking, in particular a woven wire, a hole marking and / or the like is provided as the covering marking (20).
dadurch gekennzeichnet,
dass zur Messung des Triggersignals wenigstens ein auf die Bespannungsmarkierung (20) ansprechender Triggersensor (22) eingesetzt wird.Method according to one of the preceding claims,
characterized,
that at least one trigger sensor (22) which responds to the covering marking (20) is used to measure the trigger signal.
dadurch gekennzeichnet,
dass auf beiden Seiten der Papier- bzw. Kartonmaschine jeweils wenigstens ein Triggersensor (22) eingesetzt wird.The method of claim 23
characterized,
that at least one trigger sensor (22) is used on both sides of the paper or board machine.
dadurch gekennzeichnet,
dass dem Scanner mehrere Zustandsensoren zugeordnet sind.Method according to one of the preceding claims,
characterized,
that several status sensors are assigned to the scanner.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10249385A DE10249385A1 (en) | 2002-10-23 | 2002-10-23 | Method and device for monitoring the condition of a covering |
| DE10249385 | 2002-10-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1413674A1 true EP1413674A1 (en) | 2004-04-28 |
| EP1413674B1 EP1413674B1 (en) | 2008-02-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03103684A Expired - Lifetime EP1413674B1 (en) | 2002-10-23 | 2003-10-06 | Method for monitoring the condition of a clothing |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7294234B2 (en) |
| EP (1) | EP1413674B1 (en) |
| AT (1) | ATE386159T1 (en) |
| DE (2) | DE10249385A1 (en) |
Cited By (5)
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| WO2011154262A1 (en) * | 2010-06-08 | 2011-12-15 | Voith Patent Gmbh | Method and device for monitoring a fabric |
| WO2014078419A2 (en) * | 2012-11-13 | 2014-05-22 | Georgia-Pacific Consumer Products Lp | Apparatus, system, and process for determining characteristics of a surface of a papermaking fabric |
| WO2015073061A1 (en) * | 2013-11-12 | 2015-05-21 | Georgia-Pacific Consumer Products Lp | Process for determining features of a fabric |
| US9382663B2 (en) | 2012-11-13 | 2016-07-05 | Georgia-Pacific Consumer Products Lp | Apparatus, system, and process for determining characteristics of a surface of a papermaking fabric |
| EP3763875A1 (en) * | 2013-11-12 | 2021-01-13 | GPCP IP Holdings LLC | Process for determining features of a fabric |
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| DE10343418A1 (en) * | 2003-09-19 | 2005-04-21 | Voith Paper Patent Gmbh | Apparatus and method for assessing the nature of at least one circulating belt |
| CA2548397C (en) * | 2003-12-11 | 2009-02-03 | Albany International Corp. | Passive sensor system for detection or wear problems in paper machine clothing |
| US7811417B2 (en) * | 2005-12-30 | 2010-10-12 | Honeywell Asca, Inc. | Cross-machine direction actuators for machine clothing |
| US7938935B2 (en) * | 2007-10-11 | 2011-05-10 | Honeywell Asca Inc. | Infrared measurement of paper machine clothing condition |
| CN103620114A (en) * | 2011-06-22 | 2014-03-05 | 福伊特专利公司 | Monitoring a clothing |
| US9540769B2 (en) | 2013-03-11 | 2017-01-10 | International Paper Company | Method and apparatus for measuring and removing rotational variability from a nip pressure profile of a covered roll of a nip press |
| US10378980B2 (en) | 2014-05-02 | 2019-08-13 | International Paper Company | Method and system associated with a sensing roll and a mating roll for collecting roll data |
| US9797788B2 (en) | 2014-05-02 | 2017-10-24 | International Paper Company | Method and system associated with a sensing roll including pluralities of sensors and a mating roll for collecting roll data |
| US9804044B2 (en) | 2014-05-02 | 2017-10-31 | International Paper Company | Method and system associated with a sensing roll and a mating roll for collecting data including first and second sensor arrays |
| US9534970B1 (en) | 2015-06-10 | 2017-01-03 | International Paper Company | Monitoring oscillating components |
| US9816232B2 (en) | 2015-06-10 | 2017-11-14 | International Paper Company | Monitoring upstream machine wires and felts |
| US10370795B2 (en) | 2015-06-10 | 2019-08-06 | International Paper Company | Monitoring applicator rods and applicator rod nips |
| US9677225B2 (en) | 2015-06-10 | 2017-06-13 | International Paper Company | Monitoring applicator rods |
| US9696226B2 (en) | 2015-06-10 | 2017-07-04 | International Paper Company | Count-based monitoring machine wires and felts |
| US9863827B2 (en) | 2015-06-10 | 2018-01-09 | International Paper Company | Monitoring machine wires and felts |
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- 2003-10-06 EP EP03103684A patent/EP1413674B1/en not_active Expired - Lifetime
- 2003-10-06 DE DE50309148T patent/DE50309148D1/en not_active Expired - Lifetime
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| WO2011154262A1 (en) * | 2010-06-08 | 2011-12-15 | Voith Patent Gmbh | Method and device for monitoring a fabric |
| US9443301B2 (en) | 2012-11-13 | 2016-09-13 | Georgia-Pacific Consumer Products Lp | Apparatus, system, and process for determining characteristics of a surface of a papermaking fabric |
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| US10699397B2 (en) | 2012-11-13 | 2020-06-30 | Gpcp Ip Holdings Llc | Processes of determining characteristics of a surface of a papermaking fabric |
| US9062416B2 (en) | 2012-11-13 | 2015-06-23 | Georgia-Pacific Consumer Products Lp | Apparatus, system, and process for determining characteristics of a surface of a papermaking fabric |
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| US9382663B2 (en) | 2012-11-13 | 2016-07-05 | Georgia-Pacific Consumer Products Lp | Apparatus, system, and process for determining characteristics of a surface of a papermaking fabric |
| US9920479B2 (en) | 2012-11-13 | 2018-03-20 | Gpcp Ip Holdings Llc | Apparatus, system, and process for determining characteristics of a surface of a papermaking fabric |
| WO2014078419A3 (en) * | 2012-11-13 | 2014-08-21 | Georgia-Pacific Consumer Products Lp | Apparatus, system, and process for determining characteristics of a surface of a papermaking fabric |
| US9349175B2 (en) | 2012-11-13 | 2016-05-24 | Georgia-Pacific Consumer Products Lp | Apparatus, system, and process for determining characteristics of a surface of a papermaking fabric |
| WO2014078419A2 (en) * | 2012-11-13 | 2014-05-22 | Georgia-Pacific Consumer Products Lp | Apparatus, system, and process for determining characteristics of a surface of a papermaking fabric |
| US9920480B2 (en) | 2012-11-13 | 2018-03-20 | Gpcp Ip Holdings Llc | Process of using a characteristic of a first papermaking fabric to form a second papermaking fabric |
| US9953405B2 (en) | 2012-11-13 | 2018-04-24 | Gpcp Ip Holdings Llc | Process of determining characteristics of a surface of a papermaking fabric |
| WO2015073061A1 (en) * | 2013-11-12 | 2015-05-21 | Georgia-Pacific Consumer Products Lp | Process for determining features of a fabric |
| CN105723029A (en) * | 2013-11-12 | 2016-06-29 | 佐治亚-太平洋消费产品有限合伙公司 | Process for determining features of a fabric |
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| EP3763875A1 (en) * | 2013-11-12 | 2021-01-13 | GPCP IP Holdings LLC | Process for determining features of a fabric |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1413674B1 (en) | 2008-02-13 |
| US7294234B2 (en) | 2007-11-13 |
| US20040129398A1 (en) | 2004-07-08 |
| DE50309148D1 (en) | 2008-03-27 |
| ATE386159T1 (en) | 2008-03-15 |
| DE10249385A1 (en) | 2004-05-06 |
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