EP3441521B1 - Method and device for controlling a processing unit, computer program product and paper machine - Google Patents

Method and device for controlling a processing unit, computer program product and paper machine Download PDF

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Publication number
EP3441521B1
EP3441521B1 EP17185535.6A EP17185535A EP3441521B1 EP 3441521 B1 EP3441521 B1 EP 3441521B1 EP 17185535 A EP17185535 A EP 17185535A EP 3441521 B1 EP3441521 B1 EP 3441521B1
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EP
European Patent Office
Prior art keywords
processing unit
detector
thz
paper machine
fibre
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EP17185535.6A
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German (de)
French (fr)
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EP3441521A1 (en
Inventor
Hermann Schwarz
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Siemens Energy Global GmbH and Co KG
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Siemens Energy Global GmbH and Co KG
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Priority to ES17185535T priority Critical patent/ES2935374T3/en
Priority to FIEP17185535.6T priority patent/FI3441521T3/en
Priority to EP17185535.6A priority patent/EP3441521B1/en
Publication of EP3441521A1 publication Critical patent/EP3441521A1/en
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Publication of EP3441521B1 publication Critical patent/EP3441521B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0018—Paper-making control systems controlling the stock preparation
    • 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
    • D21G9/0036—Paper-making control systems controlling the press or drying section

Definitions

  • the invention relates to a method and a device for controlling a processing unit.
  • the invention also relates to a computer program product and a paper machine.
  • a solution of (pulp) fibers is sprayed evenly onto a conveyor belt. After removing the excess water, a paper web is formed on the pulp fibers. After drying, the paper web is rolled up onto a paper roll.
  • the moisture, thickness and/or ash content are determined before the paper is rolled onto the paper roll.
  • the other processing units of the paper machine such as the refiner or the dryer section, are controlled with the aid of these variables.
  • WO 2009/062315 A1 describes a device for material measurement comprising a terahertz generator, which is set up to emit pulsed terahertz radiation at a measurement location of a material produced in a processing system.
  • the document EP 2 781 911 A1 describes a contactless sensor system and a method for determining the quality of paper material, for example dimensions, basis weight and moisture using terahertz radiation.
  • the method includes emitting a terahertz radiation signal in the direction of the paper material so that the terahertz radiation signal acts on the paper material, detecting a time and/or frequency response to the terahertz radiation signal, determining model parameters of a physical Model of the paper material and the determination of quality features of the paper material from it.
  • the document U.S. 2012/049070 A1 describes a device which can be arranged between a transmitter and a receiver of a terahertz time domain spectrometer and by means of which a laser pulse can be divided into a measurement pulse and a reference pulse.
  • WO 2011/045090 A1 describes a method of controlling a refiner for refining fibrous material.
  • the object is further achieved by a method according to claim 9.
  • THz waves it is possible to determine the properties of (pulp) fibers.
  • the orientation of the fibers, the length, in particular the average length, of the fibers and/or the overlapping of the fibers can be determined using THz waves or a THz detector.
  • the fiber composite is influenced in particular by where and to what extent the drying of the paper takes place.
  • the fiber properties in the fibrous material web are determined at short regular intervals, for example every 1 to 5 seconds, or in a continuous manner.
  • the fiber properties determined can significantly improve the control of the paper machine, in particular the refiner.
  • parameters such as process temperatures, amounts of steam, speeds and/or torques of motors and amounts of additives are controlled or regulated using specifications.
  • the specifications are preferably determined by simulating the respective process using control software.
  • the control software has inputs for measured variables such as determined temperatures or speed values.
  • the measured variables are used to support the simulation of the individual processes in the paper machine.
  • THz waves With the help of THz waves, it is also possible to easily determine the moisture content of the fibrous material web. For this purpose, the absorption of the THz waves during interaction with the fibrous web is determined. Water or moisture absorbs THz waves strongly.
  • a THz detector includes a detector for waves with a frequency of 0.1 THz to 100 THz.
  • a THz detector optionally has a source for waves in the THz range from 0.1 THz to 100 THz.
  • a frequency range between 0.5 THz and 10 THz is preferably detected with the THz detector.
  • the device for controlling a processing unit of a paper machine has at least one detector and a control device, the detector being designed to determine fiber properties of a fiber composite of a fibrous material web, the control device being provided on the basis of the fiber properties of the fiber composite for controlling or regulating the processing unit.
  • Specifications such as the speed of a drive of the processing unit, a torque of a drive or a process temperature in a processing unit are preferably controlled or regulated.
  • the specifications are preferably determined on the basis of the respective fiber property of the fiber composite of the fibrous material web.
  • An ultra-fast camera can serve as a detector, which takes pictures of the surface of the fibrous material web in quick succession.
  • a rapid succession is understood to mean, for example, between 1 image and 1,000 images per second. Preferably 1 to 50 images per second are recorded.
  • the images can be analyzed and the orientation of the fibre, the average length of the fibre, and other properties of the fibrous web can be determined.
  • average values of the orientation of the fibers and/or an average length of the fibers are determined.
  • the quality of the fibrous material web can be determined easily and reliably. Based on the determination of the fiber properties of the fibrous material web, in particular after drying, the quality of the fibrous material web can be increased by the processing unit being controlled or regulated on the basis of the fiber properties.
  • the processing unit can be a drying unit, a smoothing unit, a spraying unit, a refiner or a preparation unit for the fibers of the fibrous material web, in particular for processing the pulp.
  • the control of the refiner to influence the fiber properties is particularly advantageous.
  • the processing unit can better control or regulate the production of the fiber-containing material web, for example a paper web, based on the determined fiber properties.
  • the detector determines the fiber properties of the fibrous material web with the aid of terahertz waves.
  • the fiber properties of the fibrous material web are determined with the aid of terahertz waves (THz waves), preferably after the fibrous material web has been dried.
  • a processing unit in particular the refiner, can then be adjusted in terms of its control or regulation on the basis of the fiber properties.
  • the THz waves are preferably provided using a semiconductor diode.
  • the fiber properties are measured by absorption measurement and/or by reflection measurement.
  • a THz detector is preferably used as the detector. With the help of THz waves, the orientation of the fibers in the fibrous web can be easily determined.
  • the source of the THz waves is arranged on one side of the fibrous web and the detector on the other side of the fibrous web.
  • the source of the THz waves and the detector are arranged on the same side of the fibrous web.
  • the detector usually determines the intensity of the THz waves, the frequency of the THz waves or the phase of the THz waves.
  • the fiber property is preferably determined online. Online determination means that the respective fiber property determined with the detector is provided directly and preferably in real time.
  • detectors for the THz range in combination with sources for THz waves are already commercially available as components, a detector is understood below to mean a combination of a THz wave source and a THz wave detector.
  • the alignment of the fibers of the fiber composite and/or the length of the individual fibers can be determined by using THz waves.
  • the detector is located near a surface of the fibrous web.
  • the detector detects the THz waves that are reflected by the fibrous material web.
  • the detector can detect THz waves that have penetrated the fibrous material web.
  • the detection takes place with a THz detector.
  • An emitter for THz waves serves as the source. This is preferably arranged close to the THz detector and assigned to it.
  • the processing unit or the paper machine is controlled or regulated online.
  • An online control can be characterized by a model calculation of the processing units to be controlled.
  • the model calculation is supported by determined values of the respective processing unit.
  • online control takes place via a digital twin of the respective processing unit.
  • the fiber properties of the fibrous material web are determined and fed to the control device.
  • the control device serves to control the respective processing unit.
  • the method is designed to determine the fiber length, the fiber orientation and/or the overlapping of the fibers in the fiber composite.
  • the individual fiber properties of the fibrous web can be determined with a THz detector.
  • the fiber properties are determined before and after the fibrous material web has passed through the respective processing unit.
  • the processing device is a refiner.
  • a refiner is typically used to modify the fibers before they are applied to a web to form the fibrous web.
  • the fiber properties of the fiber-containing web can be influenced particularly efficiently.
  • a first detector for determining the fiber properties is provided before the respective processing unit and a second detector for determining the fiber properties is provided after the respective processing unit.
  • a before and after comparison of the fiber properties of the fibrous material web is advantageous in particular when controlling or regulating the press section and/or the dryer section.
  • a THz detector can advantageously determine the fiber properties before the press section, after the dryer section and/or between the press section and the dryer section.
  • the function of controlling or regulating the respective processing unit can take place. In this way, the respective processing unit can be optimized for itself.
  • the detector emits waves in the THz frequency range and detects reflected waves in the THz range.
  • the fiber properties of the fibrous material web can be determined with the aid of a detector as an assembly.
  • the respectively determined fiber property is provided for controlling or regulating the speed of the fibrous material web.
  • the control or regulation of the speed of the fibrous web serves, for example, to adjust the thickness of the fibrous web. Furthermore, the respective fiber properties can be changed by adjusting the speed. In this case, the fibrous material web has a higher web tension, in particular before it runs through the drying section.
  • the quality of the fiber-containing material web can advantageously be easily modified.
  • the processing unit is a dryer section, in particular an extended dryer section.
  • an extended dryer section has a pre-dryer section and/or an after-dryer section.
  • a particularly precise control or regulation of the dryer section, in particular the extended dryer section can take place on the basis of the fiber properties.
  • the fiber properties are preferably determined as part of the quality determination of the fibrous material web.
  • the fiber properties are preferably determined at the end of the manufacturing process of the fibrous material web. Accordingly, at least one detector is arranged in front of the winding device of a paper machine.
  • the at least one processing unit is controlled or regulated based on specifications such as speed, torque and/or process temperatures, with a detector determining fiber properties of a fibrous material web to provide the specifications.
  • the control or regulation method serves to control the respective processing unit and/or to control or regulate the paper machine.
  • the method enables a particularly precise control of the respective processing unit and/or the paper machine.
  • the detector determines the fiber properties using THz waves.
  • the detector is preferably used to determine the frequency, the phase or the intensity of the THz waves.
  • the fiber properties are preferably determined on the basis of the signals recorded by the detector.
  • a computer program product or a part of such a computer program product is preferably used to determine the respective fiber property based on the recorded signals.
  • the signals correspond in particular to the phase, the frequency, the intensity and/or the spatial and/or temporal intensity distribution of the THz waves.
  • the processing device is controlled or regulated online.
  • the processing unit is a refiner
  • the control device using the determined fiber properties controls or regulates the functioning of the refiner.
  • the refiner is used to adjust the length and shape of the fibers, especially the pulp fibers.
  • the setting is usually done by mechanical means.
  • the respective fiber properties in the fibrous web can be directly influenced.
  • the invention described here is implemented with the computer program product.
  • the computer program is installed and executable on a computing unit.
  • the computer program product can be part of an online control of the paper machine and/or individual processing units of the paper machine.
  • the computer program product is preferably designed to ensure the quality of the fiber web.
  • FIG 1 shows part of an exemplary paper machine.
  • the paper machine has a control device 3 and a fibrous web 1 , the fibrous web 1 passing through a processing unit 5 .
  • the fibrous web 1 is moved through the paper machine with the aid of a conveyor belt 1a.
  • the speed v and the direction of movement of the fibrous web 1 is represented by the arrow above the fibrous web 1 .
  • the processing unit 5 is controlled or regulated by the control device 3 .
  • the processing unit 5 can be a drying section of a paper machine.
  • Properties of the fibrous material web are determined by a detector 7 .
  • the detector 7 provides fiber properties FE to the Controller 3 ready.
  • Another detector 7 ′ is also used to determine fiber properties FE of the fibrous web 1 , the other detector 7 ′ determining the fiber properties FE before the fibrous web 1 enters the processing unit 5 .
  • the fibrous material web 1 is fixed in position by a respective deflection roller 10 .
  • the fibrous material web 1 has a speed v.
  • the control device 3 serves both to control the processing unit 5 and, optionally, to control the speed v of the fibrous material web 1.
  • the fiber properties FE are determined with the aid of a THz detector.
  • FIG 2 shows part of an exemplary paper machine.
  • the paper machine has three processing units 5a, 5b, 5c.
  • the first processing unit 5a serves to spray the cellulose-containing solution 9 onto the web 1.
  • the first processing device 5a preferably includes a refiner for modifying the fiber properties FE. By spraying on the cellulose-containing solution 9, the web becomes a fibrous web 1.
  • the second processing unit 5b is a drying section or an extended drying section.
  • the third processing unit 5c can be a quality control unit of the paper machine.
  • the third processing unit 5c has the detector 7, the detector 7 being designed to determine fiber properties FE.
  • the fiber properties FE of the fibrous material web 1 are made available to the control device 3 .
  • the control device 3 uses the fiber properties FE to control or regulate the first processing unit 5a and/or the second processing unit 5b.
  • the individual processing units 5a, 5b, 5c are preferably controlled or regulated online using the control device 3.
  • the detector 7 is preferably a THz detector.
  • the paper machine includes a first processing unit 5a, which is designed as a refiner.
  • the paper machine also has a second processing unit 5b, which is designed as a drying section or press section, and a third processing unit 5c, which is designed as a winding unit (winding section).
  • a conveyor belt 1a is used to convey a sprayed-on solution 9 containing cellulose.
  • the conveyor belt 1a serves to transport the fibrous material web 1.
  • the cellulose-containing solution 9 is provided by the first processing unit 5a.
  • the fiber properties FE of the cellulose-containing solution 9 sprayed on are determined by a first detector 7 .
  • the fiber properties FE are determined with the aid of a second detector 7'.
  • the fiber properties FE which are respectively determined by the first or second detector 7, 7', are made available to the control device 3.
  • the first, the second and optionally the third processing unit 5a, 5b, 5c are controlled or regulated.
  • water 12 and/or solid matter 14, in particular a wood-based pulp, to the refiner (first processing unit 5a) is controlled or regulated with the aid of the control device 3.
  • the invention relates to a method and a device for controlling a processing unit 5, 5a, 5b, 5c.
  • the invention also relates to a computer program product and a paper machine.
  • the respective fiber property FE of a fiber-containing material web 1, in particular a paper web, is determined with a detector 7, 7', in particular a THz detector.
  • a processing unit 5, 5a, 5b, 5c is controlled or regulated on the basis of the fiber properties FE.
  • the processing unit 5, 5a, 5b, 5c is preferably a refiner.

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Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Steuerung einer Bearbeitungseinheit. Weiter betrifft die Erfindung ein Computerprogrammprodukt sowie eine Papiermaschine.The invention relates to a method and a device for controlling a processing unit. The invention also relates to a computer program product and a paper machine.

Zur Herstellung einer faserhaltigen Warenbahn, wie Papier, wird eine Lösung von (Zellstoff-)Fasern gleichmäßig auf ein Förderband aufgesprüht. Nach Entfernen des überschüssigen Wassers entsteht auf den Zellstofffasern eine Papierbahn. Die Papierbahn wird nach dem Trocknen auf eine Papierrolle aufgerollt.To produce a fibrous web, such as paper, a solution of (pulp) fibers is sprayed evenly onto a conveyor belt. After removing the excess water, a paper web is formed on the pulp fibers. After drying, the paper web is rolled up onto a paper roll.

Zur Sicherung einer gleichbleibenden Qualität werden vor dem Aufrollen des Papiers auf die Papierrolle die Feuchte, die Dicke und/oder der Aschegehalt bestimmt. Mit Hilfe dieser Größen werden die anderen Bearbeitungseinheiten der Papiermaschine, wie der Refiner oder die Trockenpartie gesteuert.To ensure consistent quality, the moisture, thickness and/or ash content are determined before the paper is rolled onto the paper roll. The other processing units of the paper machine, such as the refiner or the dryer section, are controlled with the aid of these variables.

Das Dokument WO 2009/062315 A1 beschreibt eine Vorrichtung zur Materialvermessung umfassend einen Terahertz - Generator, der zur Emission von gepulster Terahertz - Strahlung an einem Messort eines in einem Verarbeitungssystem hergestellten Materials eingerichtet ist.The document WO 2009/062315 A1 describes a device for material measurement comprising a terahertz generator, which is set up to emit pulsed terahertz radiation at a measurement location of a material produced in a processing system.

Das Dokument EP 2 781 911 A1 beschreibt ein kontaktloses Sensorsystem und ein Verfahren zur Bestimmung der Qualität von Papiermaterial, beispielsweise Abmessungen, Grundgewicht und Feuchte mittels Terahertz - Strahlung. Das Verfahren umfasst die Emission eines Terahertz - Strahlungssignals in Richtung des Papiermaterials, so dass das Terahertz - Strahlungssignal auf das Papiermaterial einwirkt, die Detektion einer Zeit- und/oder Frequenzantwort auf das Terahertz - Strahlungssignal, die Bestimmung von Modellparametern eines physikalischen Modells des Papiermaterials und die Ermittlung von Qualitätsmerkmalen des Papiermaterials hieraus.The document EP 2 781 911 A1 describes a contactless sensor system and a method for determining the quality of paper material, for example dimensions, basis weight and moisture using terahertz radiation. The method includes emitting a terahertz radiation signal in the direction of the paper material so that the terahertz radiation signal acts on the paper material, detecting a time and/or frequency response to the terahertz radiation signal, determining model parameters of a physical Model of the paper material and the determination of quality features of the paper material from it.

Das Dokument US 2012/049070 A1 beschreibt eine Vorrichtung, welche zwischen einem Sender und einem Empfänger eines Terahertz - Zeitbereichsspektrometers angeordnet werden kann und mittels der ein Laserpuls in einen Messpuls und in einen Referenzpuls aufgeteilt werden kann.The document U.S. 2012/049070 A1 describes a device which can be arranged between a transmitter and a receiver of a terahertz time domain spectrometer and by means of which a laser pulse can be divided into a measurement pulse and a reference pulse.

Das Dokument WO 2011/045090 A1 beschreibt ein Verfahren zur Steuerung eines Refiners zur Verfeinerung faserhaltigen Materials.The document WO 2011/045090 A1 describes a method of controlling a refiner for refining fibrous material.

Noch immer treten bei der Herstellung von Papier Schwankungen bezüglich der Qualität auf.Fluctuations in quality still occur in the manufacture of paper.

Daher ist es Aufgabe der Erfindung, ein Verfahren und eine Vorrichtung bereitzustellen, die die Qualität bei der Herstellung einer faserhaltigen Warenbahn verbessen.It is therefore the object of the invention to provide a method and a device which improve the quality in the production of a fibrous material web.

Diese Aufgabe wird durch eine Vorrichtung gemäß Anspruch 1 gelöst.This object is solved by a device according to claim 1.

Die Aufgabe wird weiter durch ein Verfahren gemäß Anspruch 9 gelöst.The object is further achieved by a method according to claim 9.

Schließlich wird die Aufgabe auch durch ein Computerprogrammprodukt nach Anspruch 12 und durch eine Papiermaschine nach Anspruch 13 gelöst.Finally, the object is also achieved by a computer program product according to claim 12 and by a paper machine according to claim 13.

Mit Hilfe von (Terahertz) THz-Wellen ist es möglich, die Eigenschaften von (Zellstoff-)Fasern zu ermitteln. Mit THz-Wellen bzw. einem THz-Detektor kann die Ausrichtung der Fasern, die Länge, insbesondere die durchschnittliche Länge, der Fasern, und/oder die Überlappung der Fasern ermittelt werden.With the help of (terahertz) THz waves it is possible to determine the properties of (pulp) fibers. The orientation of the fibers, the length, in particular the average length, of the fibers and/or the overlapping of the fibers can be determined using THz waves or a THz detector.

Diese Eigenschaften (Ausrichtung, Länge und Überlappung) der Fasern in einem Faserverbund bestimmen die Qualität des Papiers, welches aus diesem Faserverbund entsteht.These properties (alignment, length and overlap) of the fibers in a fiber composite determine the quality of the paper that is made from this fiber composite.

Bei der Bearbeitung der faserhaltigen Warenbahn, insbesondere in der Trockenpartie der Papiermaschine, wird der Faserverbund insbesondere dadurch beeinflusst, wo und wie stark die Trocknung des Papiers erfolgt.During the processing of the fiber-containing material web, in particular in the drying section of the paper machine, the fiber composite is influenced in particular by where and to what extent the drying of the paper takes place.

Vorteilhaft erfolgt die Bestimmung von Fasereigenschaften in der faserhaltigen Warenbahn in kurzen regelmäßigen Abständen, beispielhaft alle 1 bis 5 Sekunden, oder in kontinuierlicher Art und Weise. Durch die ermittelten Fasereigenschaften kann die Steuerung der Papiermaschine, insbesondere des Refiners, wesentlich verbessert werden.Advantageously, the fiber properties in the fibrous material web are determined at short regular intervals, for example every 1 to 5 seconds, or in a continuous manner. The fiber properties determined can significantly improve the control of the paper machine, in particular the refiner.

Durch die Bestimmung der Fasereigenschaften kann eine online-Steuerung einer Bearbeitungseinheit der Papiermaschine oder der Papiermaschine in ihrer Gesamtheit erfolgen.By determining the fiber properties, online control of a processing unit of the paper machine or of the paper machine as a whole can take place.

Bei der online-Steuerung werden Parameter wie Prozesstemperaturen, Dampfmengen, Drehzahlen und/oder Drehmomente von Motoren sowie Mengen von Zusätzen anhand von Vorgaben gesteuert oder geregelt. Die Vorgaben werden vorzugsweise durch eine Simulation des jeweiligen Prozesses mit Hilfe einer Steuersoftware bestimmt.With online control, parameters such as process temperatures, amounts of steam, speeds and/or torques of motors and amounts of additives are controlled or regulated using specifications. The specifications are preferably determined by simulating the respective process using control software.

Die Steuersoftware weist Eingänge für Messgrößen wie ermittelte Temperaturen oder Drehzahlwerte auf. Die Messgrößen dienen zur Unterstützung der Simulation der einzelnen Vorgänge in der Papiermaschine.The control software has inputs for measured variables such as determined temperatures or speed values. The measured variables are used to support the simulation of the individual processes in the paper machine.

Mit Hilfe von THz-Wellen kann überdies eine einfache Bestimmung der Feuchte der faserhaltigen Warenbahn erfolgen. Hierzu wird die Absorption der THz-Wellen bei Wechselwirkung mit der faserhaltigen Warenbahn bestimmt. Wasser bzw. Feuchtigkeit absorbieren THz-Wellen stark.With the help of THz waves, it is also possible to easily determine the moisture content of the fibrous material web. For this purpose, the absorption of the THz waves during interaction with the fibrous web is determined. Water or moisture absorbs THz waves strongly.

Ein THz-Detektor umfasst einen Detektor für Wellen mit einer Frequenz von 0,1 THz bis 100 THz. Optional weist ein THz-Detektor eine Quelle für Wellen im THz-Bereich von 0,1 THz bis 100 THz auf. Vorzugsweise wird ein Frequenzbereich zwischen 0,5 THz bis 10 THz mit dem THz-Detektor detektiert.A THz detector includes a detector for waves with a frequency of 0.1 THz to 100 THz. A THz detector optionally has a source for waves in the THz range from 0.1 THz to 100 THz. A frequency range between 0.5 THz and 10 THz is preferably detected with the THz detector.

Die Vorrichtung zur Steuerung einer Bearbeitungseinheit einer Papiermaschine weist zumindest einen Detektor und eine Steuereinrichtung auf, wobei der Detektor zur Bestimmung von Fasereigenschaften eines Faserverbundes einer faserhaltigen Warenbahn ausgebildet ist, wobei die Steuereinrichtung anhand der Fasereigenschaften des Faserverbundes zur Steuerung oder Regelung der Bearbeitungseinheit vorgesehen ist.The device for controlling a processing unit of a paper machine has at least one detector and a control device, the detector being designed to determine fiber properties of a fiber composite of a fibrous material web, the control device being provided on the basis of the fiber properties of the fiber composite for controlling or regulating the processing unit.

Vorzugsweise werden Vorgaben wie Drehzahl eines Antriebs der Bearbeitungseinheit, ein Drehmoment eines Antriebs oder eine Prozesstemperatur bei einer Bearbeitungseinheit gesteuert oder geregelt. Die Vorgaben werden vorzugsweise anhand der jeweiligen Fasereigenschaft des Faserverbundes der faserhaltigen Warenbahn ermittelt.Specifications such as the speed of a drive of the processing unit, a torque of a drive or a process temperature in a processing unit are preferably controlled or regulated. The specifications are preferably determined on the basis of the respective fiber property of the fiber composite of the fibrous material web.

Als Detektor kann eine ultraschnelle Kamera dienen, die in schneller Abfolge Bilder der Oberfläche der faserhaltigen Warenbahn aufnimmt. Unter einer schnellen Abfolge wird beispielhaft zwischen 1 Bild bis 1.000 Bilder pro Sekunde verstanden. Vorzugsweise werden 1 bis 50 Bilder pro Sekunde aufgenommen.An ultra-fast camera can serve as a detector, which takes pictures of the surface of the fibrous material web in quick succession. A rapid succession is understood to mean, for example, between 1 image and 1,000 images per second. Preferably 1 to 50 images per second are recorded.

Die Bilder können analysiert werden und die Ausrichtung der Faser, die mittlere Länge der Faser sowie weitere Eigenschaften der Faserbahn können bestimmt werden.The images can be analyzed and the orientation of the fibre, the average length of the fibre, and other properties of the fibrous web can be determined.

In der Regel werden Mittelwerte der Ausrichtung der Fasern und/oder eine mittlere Länge der Fasern bestimmt.As a rule, average values of the orientation of the fibers and/or an average length of the fibers are determined.

Durch die Bestimmung der Ausrichtung der Fasern und/oder der Länge der Fasern kann die Qualität der faserhaltigen Warenbahn einfach und sicher bestimmt werden. Anhand der Bestimmung der Fasereigenschaften der faserhaltigen Warenbahn, insbesondere nach dem Trocknen, kann die Qualität der faserhaltigen Warenbahn erhöht werden, indem die Bearbeitungseinheit anhand der Fasereigenschaften gesteuert oder geregelt wird.By determining the orientation of the fibers and/or the length of the fibers, the quality of the fibrous material web can be determined easily and reliably. Based on the determination of the fiber properties of the fibrous material web, in particular after drying, the quality of the fibrous material web can be increased by the processing unit being controlled or regulated on the basis of the fiber properties.

Bei der Bearbeitungseinheit kann es sich um eine Trockeneinheit, um eine Glätteinheit, um eine Aufsprüheinheit, um einen Refiner oder um eine Vorbereitungseinheit für die Faser der faserhaltigen Warenbahn, insbesondere für die Verarbeitung des Zellstoffs, handeln. Die Steuerung des Refiners zur Beeinflussung der Fasereigenschaften ist besonders vorteilhaft.The processing unit can be a drying unit, a smoothing unit, a spraying unit, a refiner or a preparation unit for the fibers of the fibrous material web, in particular for processing the pulp. The control of the refiner to influence the fiber properties is particularly advantageous.

Die Bearbeitungseinheit kann anhand der ermittelten Fasereigenschaften die Herstellung der faserhaltigen Warenbahn, beispielhaft eine Papierbahn, verbessert steuern oder regeln.The processing unit can better control or regulate the production of the fiber-containing material web, for example a paper web, based on the determined fiber properties.

In einer erfindungsgemäßen Ausgestaltung der Erfindung ermittelt der Detektor die Fasereigenschaften der faserhaltigen Warenbahn mit Hilfe von Teraherz-Wellen.In an embodiment of the invention according to the invention, the detector determines the fiber properties of the fibrous material web with the aid of terahertz waves.

Mit Hilfe von Teraherz-Wellen (THz-Wellen) werden die Fasereigenschaften der faserhaltigen Warenbahn vorzugsweise nach dem Trocknen der faserhaltigen Warenbahn bestimmt. Anhand der Fasereigenschaften kann dann eine Bearbeitungseinheit, insbesondere der Refiner, in seiner Steuerung oder Regelung angepasst werden.The fiber properties of the fibrous material web are determined with the aid of terahertz waves (THz waves), preferably after the fibrous material web has been dried. A processing unit, in particular the refiner, can then be adjusted in terms of its control or regulation on the basis of the fiber properties.

Die THz-Wellen werden vorzugsweise mit Hilfe einer Halbleiter-Diode bereitgestellt. Die Messung der Fasereigenschaften erfolgt durch Absorptionsmessung und/oder durch Reflexionsmessung. Als Detektor dient vorzugsweise ein THz-Detektor. Mit Hilfe von THz-Wellen kann die Ausrichtung der Fasern in der faserhaltigen Warenbahn einfach ermittelt werden.The THz waves are preferably provided using a semiconductor diode. The fiber properties are measured by absorption measurement and/or by reflection measurement. A THz detector is preferably used as the detector. With the help of THz waves, the orientation of the fibers in the fibrous web can be easily determined.

Bei der Absorptionsmessung ist die Quelle der THz-Wellen auf einer Seite der faserhaltigen Warenbahn angeordnet und der Detektor auf der anderen Seite der faserhaltigen Warenbahn. Bei der Reflexionsmessung sind die Quelle der THz-Wellen und der Detektor auf derselben Seite der faserhaltigen Warenbahn angeordnet.In the case of the absorption measurement, the source of the THz waves is arranged on one side of the fibrous web and the detector on the other side of the fibrous web. In the case of the reflection measurement, the source of the THz waves and the detector are arranged on the same side of the fibrous web.

Der Detektor bestimmt in der Regel die Intensität der THz-Wellen, die Frequenz der THz-Wellen oder die Phase der THz-Wellen.The detector usually determines the intensity of the THz waves, the frequency of the THz waves or the phase of the THz waves.

Vorzugsweise erfolgt die Bestimmung der Fasereigenschaft online. Unter einer online-Bestimmung wird verstanden, dass die mit dem Detektor bestimmte jeweilige Fasereigenschaft direkt und vorzugsweise in Echtzeit bereitgestellt wird.The fiber property is preferably determined online. Online determination means that the respective fiber property determined with the detector is provided directly and preferably in real time.

Da Detektoren für den THz-Bereich in Kombination mit Quellen für THz-Wellen als Bauelemente bereits im Handel erhältlich sind, wird im Folgenden unter einem Detektor eine Kombination einer THz-Wellen-Quelle und einem THz-Wellen-Detektor verstanden.Since detectors for the THz range in combination with sources for THz waves are already commercially available as components, a detector is understood below to mean a combination of a THz wave source and a THz wave detector.

Durch den Einsatz von THz-Wellen können die Ausrichtung der Fasern des Faserverbunds und/oder die Länge der einzelnen Fasern bestimmt werden.The alignment of the fibers of the fiber composite and/or the length of the individual fibers can be determined by using THz waves.

Vorzugsweise ist der Detektor nahe einer Oberfläche der faserhaltigen Warenbahn angeordnet.Preferably, the detector is located near a surface of the fibrous web.

Bei einer weiteren vorteilhaften Ausführung der Erfindung detektiert der Detektor die THz-Wellen, die von der faserhaltigen Warenbahn reflektiert werden.In a further advantageous embodiment of the invention, the detector detects the THz waves that are reflected by the fibrous material web.

Ebenso oder alternativ kann der Detektor THz-Wellen detektieren, welche die faserhaltige Warenbahn durchdrungen haben.Likewise or alternatively, the detector can detect THz waves that have penetrated the fibrous material web.

Die Detektion erfolgt mit einem THz-Detektor. Als Quelle dient ein Emitter für THz-Wellen. Dieser ist vorzugsweise nahe des THz-Detektors angeordnet und diesem zugeordnet.The detection takes place with a THz detector. An emitter for THz waves serves as the source. This is preferably arranged close to the THz detector and assigned to it.

Durch die Bestimmung der reflektierten THz-Wellen beeinflussen Eigenschaften wie die Feuchte der faserhaltigen Warenbahn die Bestimmung der Fasereigenschaften nicht.By determining the reflected THz waves, properties such as the moisture content of the fibrous web do not affect the determination of the fiber properties.

Bei einer weiteren Ausgestaltung der Erfindung erfolgt die Steuerung oder Regelung der Bearbeitungseinheit oder der Papiermaschine online.In a further embodiment of the invention, the processing unit or the paper machine is controlled or regulated online.

Eine online-Steuerung kann sich durch eine Modellrechnung der zu steuernden Bearbeitungseinheiten auszeichnen. Die Modellrechnung wird durch ermittelte Werte der jeweiligen Bearbeitungseinheit unterstützt. Beispielhaft erfolgt eine online-Steuerung über einen digitalen Zwilling der jeweiligen Bearbeitungseinheit. Um die Bearbeitungseinheit verbessert abzubilden und in ihrer Wirkweise zu verbessern, werden die Fasereigenschaften der faserhaltigen Warenbahn ermittelt und der Steuereinrichtung zugeführt. Die Steuereinrichtung dient der Steuerung der jeweiligen Bearbeitungseinheit.An online control can be characterized by a model calculation of the processing units to be controlled. The model calculation is supported by determined values of the respective processing unit. For example, online control takes place via a digital twin of the respective processing unit. In order to better map the processing unit and improve its mode of operation, the fiber properties of the fibrous material web are determined and fed to the control device. The control device serves to control the respective processing unit.

Durch die online-Steuerung kann eine Abweichung der Fasereigenschaften vorteilhaft zur Anpassung der Steuereinrichtung führen.Due to the online control, a deviation in the fiber properties can advantageously lead to an adaptation of the control device.

In einer weiteren vorteilhaften Ausgestaltung der Erfindung ist das Verfahren zur Ermittlung der Faserlänge, der Faserausrichtung und/oder der Überlappung der Fasern im Faserverbund ausgebildet.In a further advantageous embodiment of the invention, the method is designed to determine the fiber length, the fiber orientation and/or the overlapping of the fibers in the fiber composite.

Mit einem THz-Detektor können die einzelnen Fasereigenschaften der faserhaltigen Warenbahn ermittelt werden.The individual fiber properties of the fibrous web can be determined with a THz detector.

Erfindungsgemäß erfolgt eine Bestimmung der Fasereigenschaften vor und nach einem Durchlauf der faserhaltigen Warenbahn durch die jeweilige Bearbeitungseinheit.According to the invention, the fiber properties are determined before and after the fibrous material web has passed through the respective processing unit.

Durch die Bestimmung der vorgenannten Fasereigenschaften kann ein direkter Rückschluss auf die Funktion der Steuerung oder Regelung der jeweiligen Bearbeitungseinheit, insbesondere des Refiners, gezogen werden.By determining the aforementioned fiber properties, a direct conclusion can be drawn about the function of the controller or Regulation of the respective processing unit, in particular the refiner, are drawn.

Bei einer weiteren vorteilhaften Ausgestaltung der Erfindung ist die Bearbeitungseinrichtung ein Refiner.In a further advantageous embodiment of the invention, the processing device is a refiner.

Ein Refiner dient in der Regel zur Modifikation der Fasern, bevor diese zur Bildung der faserhaltigen Warenbahn auf eine Bahn aufgebracht wird.A refiner is typically used to modify the fibers before they are applied to a web to form the fibrous web.

Durch die Steuerung des Refiners kann eine besonders effiziente Beeinflussung der Fasereigenschaften der faserhaltigen Warenbahn erfolgen.By controlling the refiner, the fiber properties of the fiber-containing web can be influenced particularly efficiently.

Bei einer weiteren vorteilhaften Ausgestaltung der Erfindung sind ein erster Detektor zur Bestimmung der Fasereigenschaften vor der jeweiligen Bearbeitungseinheit und ein zweiter Detektor zur Bestimmung der Fasereigenschaften nach der jeweiligen Bearbeitungseinheit vorgesehen.In a further advantageous embodiment of the invention, a first detector for determining the fiber properties is provided before the respective processing unit and a second detector for determining the fiber properties is provided after the respective processing unit.

Insbesondere bei der Steuerung oder Regelung der Pressenpartie und/oder der Trockenpartie ist ein Vorher-Nachher-Vergleich der Fasereigenschaften der faserhaltigen Warenbahn jeweils vorteilhaft.A before and after comparison of the fiber properties of the fibrous material web is advantageous in particular when controlling or regulating the press section and/or the dryer section.

Weiter kann vorteilhaft jeweils ein THz-Detektor die Fasereigenschaften vor der Pressenpartie, nach der Trockenpartie und/oder zwischen der Pressenpartie und der Trockenpartie ermitteln.Furthermore, a THz detector can advantageously determine the fiber properties before the press section, after the dryer section and/or between the press section and the dryer section.

Durch die mehrfache Ermittlung der Fasereigenschaften kann die Funktion der Steuerung oder Regelung der jeweiligen Bearbeitungseinheit erfolgen. So kann die jeweilige Bearbeitungseinheit für sich optimiert werden.By repeatedly determining the fiber properties, the function of controlling or regulating the respective processing unit can take place. In this way, the respective processing unit can be optimized for itself.

Bei einer weiteren vorteilhaften Ausgestaltung der Erfindung sendet der Detektor Wellen im THz-Frequenzbereich aus und detektiert reflektierte Wellen im THz-Bereich.In a further advantageous embodiment of the invention, the detector emits waves in the THz frequency range and detects reflected waves in the THz range.

Durch diese Ausführung können mit Hilfe eines Detektors als Baugruppe die Fasereigenschaften der faserhaltigen Warenbahn bestimmt werden.With this design, the fiber properties of the fibrous material web can be determined with the aid of a detector as an assembly.

Bei einer weiteren vorteilhaften Ausgestaltung der Erfindung ist die jeweilig ermittelte Fasereigenschaft zur Steuerung oder Regelung der Geschwindigkeit der faserhaltigen Warenbahn vorgesehen.In a further advantageous embodiment of the invention, the respectively determined fiber property is provided for controlling or regulating the speed of the fibrous material web.

Die Steuerung oder Regelung der Geschwindigkeit der faserhaltigen Warenbahn dient beispielhaft zur Einstellung der Dicke der faserhaltigen Warenbahn. Weiter kann durch die Einstellung der Geschwindigkeit die jeweilige Fasereigenschaft verändert werden. Hierbei weist die faserhaltige Warenbahn eine höhere Bahnspannung, insbesondere vor dem Durchlauf der Trockenpartie, auf.The control or regulation of the speed of the fibrous web serves, for example, to adjust the thickness of the fibrous web. Furthermore, the respective fiber properties can be changed by adjusting the speed. In this case, the fibrous material web has a higher web tension, in particular before it runs through the drying section.

Durch die Steuerung oder Regelung der Geschwindigkeit der Warenbahn kann die Qualität der faserhaltigen Warenbahn vorteilhaft einfach modifiziert werden.By controlling or regulating the speed of the material web, the quality of the fiber-containing material web can advantageously be easily modified.

In einer weiteren vorteilhaften Ausführung der Erfindung ist die Bearbeitungseinheit eine Trockenpartie, insbesondere eine erweiterte Trockenpartie.In a further advantageous embodiment of the invention, the processing unit is a dryer section, in particular an extended dryer section.

Eine erweiterte Trockenpartie weist neben der eigentlichen Trockenpartie eine Vortrockenpartie und/oder eine Nachtrockenpartie auf. Durch die Steuerung oder Regelung der Trockenpartie kann anhand der Fasereigenschaften eine besonders genaue Steuerung oder Regelung der Trockenpartie, insbesondere der erweiterten Trockenpartie erfolgen.In addition to the actual dryer section, an extended dryer section has a pre-dryer section and/or an after-dryer section. By controlling or regulating the dryer section, a particularly precise control or regulation of the dryer section, in particular the extended dryer section, can take place on the basis of the fiber properties.

Bevorzugt findet die Bestimmung der Fasereigenschaften im Rahmen der Qualitätsbestimmung der faserhaltigen Warenbahn statt. Vorzugsweise erfolgt eine Bestimmung der Fasereigenschaften am Ende des Herstellungsprozesses der faserhaltigen Warenbahn. Demnach ist zumindest ein Detektor vor der WickelVorrichtung einer Papiermaschine angeordnet.The fiber properties are preferably determined as part of the quality determination of the fibrous material web. The fiber properties are preferably determined at the end of the manufacturing process of the fibrous material web. Accordingly, at least one detector is arranged in front of the winding device of a paper machine.

Bei dem Verfahren zur Steuerung einer Verarbeitungseinheit einer Papiermaschine wird die zumindest eine Verarbeitungseinheit anhand von Vorgaben wie Drehzahl, Drehmoment und/oder Prozesstemperaturen gesteuert oder geregelt, wobei zur Bereitstellung der Vorgaben ein Detektor Fasereigenschaften einer faserhaltigen Warenbahn ermittelt.In the method for controlling a processing unit of a paper machine, the at least one processing unit is controlled or regulated based on specifications such as speed, torque and/or process temperatures, with a detector determining fiber properties of a fibrous material web to provide the specifications.

Das Verfahren zur Steuerung oder Regelung dient zur Steuerung der jeweiligen Verarbeitungseinheit und/oder zur Steuerung oder Regelung der Papiermaschine.The control or regulation method serves to control the respective processing unit and/or to control or regulate the paper machine.

Durch das Verfahren ist eine besonders genaue Steuerung der jeweiligen Bearbeitungseinheit und/oder der Papiermaschine möglich.The method enables a particularly precise control of the respective processing unit and/or the paper machine.

Bei einer weiteren vorteilhaften Ausgestaltung der Erfindung bestimmt der Detektor die Fasereigenschaften mit Hilfe von THz-Wellen.In a further advantageous embodiment of the invention, the detector determines the fiber properties using THz waves.

Vorzugsweise dient der Detektor zur Bestimmung der Frequenz, der Phase oder der Intensität der THz-Wellen. Anhand der mit dem Detektor aufgenommenen Signale werden vorzugsweise die Fasereigenschaften bestimmt.The detector is preferably used to determine the frequency, the phase or the intensity of the THz waves. The fiber properties are preferably determined on the basis of the signals recorded by the detector.

Bevorzugt dient ein Computerprogrammprodukt oder ein Teil eines solchen Computerprogramproduktes zur Bestimmung der jeweiligen Fasereigenschaft anhand der aufgenommenen Signale. Die Signale entsprechen insbesondere der Phase, der Frequenz, der Intensität und/oder der räumlich und/oder zeitlichen Intensitätsverteilung der THz-Wellen.A computer program product or a part of such a computer program product is preferably used to determine the respective fiber property based on the recorded signals. The signals correspond in particular to the phase, the frequency, the intensity and/or the spatial and/or temporal intensity distribution of the THz waves.

Bei einer weiteren vorteilhaften Ausgestaltung der Erfindung erfolgt die Steuerung oder Regelung der Verarbeitungseinrichtung online.In a further advantageous embodiment of the invention, the processing device is controlled or regulated online.

Bei einer weiteren vorteilhaften Ausgestaltung des Verfahrens oder der Vorrichtung ist die Bearbeitungseinheit ein Refiner, wobei die Steuereinrichtung mit Hilfe der ermittelten Fasereigenschaften die Funktionsweise des Refiners steuert oder regelt.In a further advantageous embodiment of the method or the device, the processing unit is a refiner, the control device using the determined fiber properties controls or regulates the functioning of the refiner.

Der Refiner dient zur Einstellung der Länge und Ausprägung der Fasern, insbesondere der Zellstofffasern. Die Einstellung erfolgt in der Regel mit mechanischen Mitteln. Durch die Einstellung des Refiners kann die jeweilige Fasereigenschaft in der faserhaltigen Warenbahn unmittelbar beeinflusst werden.The refiner is used to adjust the length and shape of the fibers, especially the pulp fibers. The setting is usually done by mechanical means. By adjusting the refiner, the respective fiber properties in the fibrous web can be directly influenced.

Mit dem Computerprogrammprodukt wird die hier beschriebene Erfindung ausgeführt. Hierzu ist das Computerprogramm auf einer Recheneinheit installiert und ablauffähig. Das Computerprogrammprodukt kann Teil einer online-Steuerung der Papiermaschine und/oder einzelnen Bearbeitungseinheiten der Papiermaschine sein. Das Computerprogrammprodukt ist vorzugsweise zur Sicherstellung der Qualität der Faserbahn ausgebildet.The invention described here is implemented with the computer program product. For this purpose, the computer program is installed and executable on a computing unit. The computer program product can be part of an online control of the paper machine and/or individual processing units of the paper machine. The computer program product is preferably designed to ensure the quality of the fiber web.

Im Folgenden wird die Erfindung anhand von Figuren weiter beschrieben und erläutert. Die in den FIG gezeigten Merkmale der Ausführungsformen können einzeln zu neuen Ausführungen der Erfindung kombiniert werden. Es zeigen:

FIG 1 bis FIG 3
jeweils einen Teil einer beispielhaften Papiermaschine.
The invention is further described and explained below with reference to figures. The features of the embodiments shown in the figures can be combined individually to form new versions of the invention. Show it:
1 to 3
each part of an exemplary paper machine.

FIG 1 zeigt einen Teil einer beispielhaften Papiermaschine. Die Papiermaschine weist eine Steuereinrichtung 3 und eine faserhaltige Warenbahn 1 auf, wobei die faserhaltige Warenbahn 1 eine Bearbeitungseinheit 5 durchläuft. Die faserhaltige Warenbahn 1 wird mit Hilfe eines Förderbandes 1a durch die Papiermaschine bewegt. Die Geschwindigkeit v und die Bewegungsrichtung der faserhaltigen Warenbahn 1 wird durch den Pfeil oberhalb der faserhaltigen Warenbahn 1 dargestellt. Die Bearbeitungseinheit 5 wird durch die Steuereinrichtung 3 gesteuert oder geregelt. Die Bearbeitungseinheit 5 kann eine Trockenpartie einer Papiermaschine sein. Eigenschaften der faserhaltigen Warenbahn werden durch einen Detektor 7 ermittelt. Der Detektor 7 stellt Fasereigenschaften FE an die Steuereinrichtung 3 bereit. Ein weiterer Detektor 7' dient ebenfalls zur Bestimmung von Fasereigenschaften FE der faserhaltigen Warenbahn 1, wobei der weitere Detektor 7' die Fasereigenschaften FE vor dem Eingang der faserhaltigen Warenbahn 1 in die Bearbeitungseinheit 5 ermittelt. FIG 1 shows part of an exemplary paper machine. The paper machine has a control device 3 and a fibrous web 1 , the fibrous web 1 passing through a processing unit 5 . The fibrous web 1 is moved through the paper machine with the aid of a conveyor belt 1a. The speed v and the direction of movement of the fibrous web 1 is represented by the arrow above the fibrous web 1 . The processing unit 5 is controlled or regulated by the control device 3 . The processing unit 5 can be a drying section of a paper machine. Properties of the fibrous material web are determined by a detector 7 . The detector 7 provides fiber properties FE to the Controller 3 ready. Another detector 7 ′ is also used to determine fiber properties FE of the fibrous web 1 , the other detector 7 ′ determining the fiber properties FE before the fibrous web 1 enters the processing unit 5 .

Die faserhaltige Warenbahn 1 wird von jeweils einer Umlenkrolle 10 in ihrer Position fixiert. Die faserhaltige Warenbahn 1 weist eine Geschwindigkeit v auf. Die Steuereinrichtung 3 dient sowohl zur Steuerung der Bearbeitungseinheit 5 als auch optional zur Geschwindigkeit v der faserhaltigen Warenbahn 1.The fibrous material web 1 is fixed in position by a respective deflection roller 10 . The fibrous material web 1 has a speed v. The control device 3 serves both to control the processing unit 5 and, optionally, to control the speed v of the fibrous material web 1.

Bei dem jeweiligen Detektor 7, 7' erfolgt die Bestimmung der Fasereigenschaften FE mit Hilfe eines THz-Detektors.In the case of the respective detector 7, 7', the fiber properties FE are determined with the aid of a THz detector.

FIG 2 zeigt einen Teil einer beispielhaften Papiermaschine. Die Papiermaschine weist drei Bearbeitungseinheiten 5a, 5b, 5c auf. Die erste Bearbeitungseinheit 5a dient zum Aufsprühen der zellstoffhaltigen Lösung 9 auf die Warenbahn 1. Vorzugsweise umfasst die erste Bearbeitungseinrichtung 5a einen Refiner zur Modifikation der Fasereigenschaften FE. Durch Aufsprühen der zellstoffhaltigen Lösung 9 wird die Warenbahn zu einer faserhaltigen Warenbahn 1. Die zweite Bearbeitungseinheit 5b ist eine Trockenpartie bzw. eine erweiterte Trockenpartie. Die dritte Bearbeitungseinheit 5c kann eine Qualitätskontrolleinheit der Papiermaschine sein. Die dritte Bearbeitungseinheit 5c weist den Detektor 7 auf, wobei der Detektor 7 zur Bestimmung von Fasereigenschaften FE ausgebildet ist. Die Fasereigenschaften FE der faserhaltigen Warenbahn 1 werden der Steuereinrichtung 3 bereit gestellt. FIG 2 shows part of an exemplary paper machine. The paper machine has three processing units 5a, 5b, 5c. The first processing unit 5a serves to spray the cellulose-containing solution 9 onto the web 1. The first processing device 5a preferably includes a refiner for modifying the fiber properties FE. By spraying on the cellulose-containing solution 9, the web becomes a fibrous web 1. The second processing unit 5b is a drying section or an extended drying section. The third processing unit 5c can be a quality control unit of the paper machine. The third processing unit 5c has the detector 7, the detector 7 being designed to determine fiber properties FE. The fiber properties FE of the fibrous material web 1 are made available to the control device 3 .

Anhand der Fasereigenschaften FE steuert oder regelt die Steuereinrichtung 3 die erste Bearbeitungseinheit 5a und/oder die zweite Bearbeitungseinheit 5b. Vorzugsweise erfolgt eine online-Steuerung oder online-Regelung der einzelnen Bearbeitungseinheiten 5a, 5b, 5c mit Hilfe der Steuereinrichtung 3. Auch hier ist der Detektor 7 vorzugsweise ein THz-Detektor.The control device 3 uses the fiber properties FE to control or regulate the first processing unit 5a and/or the second processing unit 5b. The individual processing units 5a, 5b, 5c are preferably controlled or regulated online using the control device 3. Here, too, the detector 7 is preferably a THz detector.

FIG 3 zeigt einen Teil einer beispielhaften Papiermaschine. Die Papiermaschine umfasst eine erste Bearbeitungseinheit 5a, die als Refiner ausgebildet ist. Die Papiermaschine weist weiter eine zweite Bearbeitungseinheit 5b auf, die als Trockenpartie oder Pressenpartie ausgebildet ist sowie eine dritte Bearbeitungseinheit 5c, die als Wickelaggregat (Wickelpartie) ausgebildet ist. Zur Beförderung einer aufgesprühten zellstoffhaltigen Lösung 9 dient ein Förderband la. Das Förderband 1a dient zum Transport der faserhaltigen Warenbahn 1. Die zellstoffhaltige Lösung 9 wird von der ersten Bearbeitungseinheit 5a bereit gestellt. Die Fasereigenschaften FE der aufgesprühten zellstoffhaltigen Lösung 9 wird durch einen ersten Detektor 7 ermittelt. Nach Durchlauf der faserhaltigen Warenbahn 1 durch die zweite Bearbeitungseinheit 5b erfolgt die Ermittlung der Fasereigenschaften FE mit Hilfe eines zweiten Detektors 7'. Die Fasereigenschaften FE, die jeweils vom ersten oder zweiten Detektor 7, 7' ermittelt werden, werden der Steuereinrichtung 3 bereit gestellt. Mit Hilfe der Steuereinrichtung 3 werden die erste, die zweite und optional die dritte Bearbeitungseinheit 5a, 5b, 5c gesteuert oder geregelt. 3 shows part of an exemplary paper machine. The paper machine includes a first processing unit 5a, which is designed as a refiner. The paper machine also has a second processing unit 5b, which is designed as a drying section or press section, and a third processing unit 5c, which is designed as a winding unit (winding section). A conveyor belt 1a is used to convey a sprayed-on solution 9 containing cellulose. The conveyor belt 1a serves to transport the fibrous material web 1. The cellulose-containing solution 9 is provided by the first processing unit 5a. The fiber properties FE of the cellulose-containing solution 9 sprayed on are determined by a first detector 7 . After the fiber-containing material web 1 has passed through the second processing unit 5b, the fiber properties FE are determined with the aid of a second detector 7'. The fiber properties FE, which are respectively determined by the first or second detector 7, 7', are made available to the control device 3. With the aid of the control device 3, the first, the second and optionally the third processing unit 5a, 5b, 5c are controlled or regulated.

Mit Hilfe der Steuereinrichtung 3 wird überdies der Zugang von Wasser 12 und/oder Feststoff 14, insbesondere ein auf Holz basierender Zellstoff, des Refiners (erste Bearbeitungseinheit 5a) gesteuert oder geregelt.In addition, the access of water 12 and/or solid matter 14, in particular a wood-based pulp, to the refiner (first processing unit 5a) is controlled or regulated with the aid of the control device 3.

Zusammenfassend betrifft die Erfindung ein Verfahren und eine Vorrichtung zur Steuerung einer Bearbeitungseinheit 5, 5a, 5b, 5c. Weiter betrifft die Erfindung ein Computerprogrammprodukt sowie eine Papiermaschine. Mit einem Detektor 7, 7', insbesondere einem THz-Detektor wird die jeweilige Fasereigenschaft FE einer faserhaltigen Warenbahn 1, insbesondere einer Papierbahn, bestimmt. Anhand der Fasereigenschaften FE wird eine Bearbeitungseinheit 5, 5a, 5b, 5c gesteuert oder geregelt. Bei der Bearbeitungseinheit 5, 5a, 5b, 5c handelt es sich vorzugsweise um einen Refiner. Durch die direkte Bestimmung der Fasereigenschaften FE der faserhaltigen Warenbahn 1 kann direkt auf die Qualität der faserhaltigen Warenbahn 1 Einfluss genommen werden.In summary, the invention relates to a method and a device for controlling a processing unit 5, 5a, 5b, 5c. The invention also relates to a computer program product and a paper machine. The respective fiber property FE of a fiber-containing material web 1, in particular a paper web, is determined with a detector 7, 7', in particular a THz detector. A processing unit 5, 5a, 5b, 5c is controlled or regulated on the basis of the fiber properties FE. The processing unit 5, 5a, 5b, 5c is preferably a refiner. By direct determination the fiber properties FE of the fibrous web 1 can directly influence the quality of the fibrous web 1 .

Claims (13)

  1. Apparatus for controlling a processing unit (5, 5a, 5b, 5c) of a paper machine, having at least a first detector (7) and a second detector (7') and a control device (3), wherein the detectors (7, 7') are designed to determine fibre properties (FE) of a fibre composite of a fibrous product web (1) with the aid of terahertz (THz) waves, wherein the control device (3) is provided for the purpose of controlling or regulating the processing unit (5, 5a, 5b, 5c) on the basis of the fibre properties (FE) of the fibre composite, characterized in that the first detector (7) is provided for the purpose of determining the fibre properties (FE) upstream of the respective processing unit (5, 5a, 5b, 5c) and the second detector (7') is provided for the purpose of determining the fibre properties (FE) downstream of the respective processing unit (5, 5a, 5b, 5c).
  2. Apparatus according to Claim 1, wherein a detector (7, 7') detects the THz waves which are reflected by the fibrous product web (1).
  3. Apparatus according to one of the preceding claims, wherein the processing unit (5, 5a, 5b, 5c) or the paper machine is controlled or regulated online.
  4. Apparatus according to one of the preceding claims, wherein a detector (7, 7') is designed to determine the fibre length, the fibre orientation and/or the overlap of the fibres in the fibre composite.
  5. Apparatus according to one of the preceding claims, wherein the processing device (5, 5a, 5b, 5c) is a refiner.
  6. Apparatus according to one of the preceding claims, wherein a detector (7, 7') emits waves in the THz frequency range and detects reflected waves in the THz range.
  7. Apparatus according to one of the preceding claims, wherein the determined fibre properties (FE) are provided for the purpose of controlling or regulating the speed of the fibrous product web (1).
  8. Apparatus according to one of the preceding claims, wherein the processing unit (5, 5a, 5b, 5c) is a dryer section, in particular an expanded dryer section.
  9. Method for controlling a processing unit (5, 5a, 5b, 5c) of a paper machine comprising an apparatus according to one of the preceding claims, wherein the at least one processing unit (5, 5a, 5b, 5c) is controlled or regulated on the basis of specifications such as speed, torque and/or process temperatures, wherein, in order to provide the specifications, the first detector (7) determines fibre properties (FE) of a fibrous product web (1) upstream of the processing unit (5, 5a, 5b, 5c) and the second detector (7') determines fibre properties (FE) of a fibrous product web (1) downstream of the processing unit (5, 5a, 5b, 5c).
  10. Method according to Claim 9, wherein the processing unit (5, 5a, 5b, 5c) is controlled or regulated online, wherein process parameters are determined by simulating the respective process with the aid of control software.
  11. Method according to either of Claims 9 and 10, wherein the processing unit (5, 5a, 5b, 5c) is a refiner, and wherein the control device (3) controls or regulates the method of operation of the refiner with the aid of the determined fibre properties (FE).
  12. Computer program product for installation and running on a computing unit, wherein the computer program is designed to carry out a method according to one of Claims 9 to 11.
  13. Paper machine having an apparatus according to one of Claims 1 to 8.
EP17185535.6A 2017-08-09 2017-08-09 Method and device for controlling a processing unit, computer program product and paper machine Active EP3441521B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES17185535T ES2935374T3 (en) 2017-08-09 2017-08-09 Method and device for controlling a processing unit, computer program product, as well as a paper-making machine
FIEP17185535.6T FI3441521T3 (en) 2017-08-09 2017-08-09 Method and device for controlling a processing unit, computer program product and paper machine
EP17185535.6A EP3441521B1 (en) 2017-08-09 2017-08-09 Method and device for controlling a processing unit, computer program product and paper machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17185535.6A EP3441521B1 (en) 2017-08-09 2017-08-09 Method and device for controlling a processing unit, computer program product and paper machine

Publications (2)

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EP3441521A1 EP3441521A1 (en) 2019-02-13
EP3441521B1 true EP3441521B1 (en) 2022-10-05

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ES (1) ES2935374T3 (en)
FI (1) FI3441521T3 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7609366B2 (en) * 2007-11-16 2009-10-27 Honeywell International Inc. Material measurement system for obtaining coincident properties and related method
CN102666977B (en) * 2009-10-14 2016-02-24 Abb研究有限公司 There is the energy efficiency of improvement and process and the system for grinding fibrous material of pulp quality
US8378304B2 (en) * 2010-08-24 2013-02-19 Honeywell Asca Inc. Continuous referencing for increasing measurement precision in time-domain spectroscopy
EP2781911B1 (en) * 2013-03-18 2019-10-16 ABB Schweiz AG Sensor system and method for determining paper sheet quality parameters

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FI3441521T3 (en) 2023-01-13
ES2935374T3 (en) 2023-03-06

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