EP1530103B1 - Method for producing a fibrous web - Google Patents

Method for producing a fibrous web Download PDF

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Publication number
EP1530103B1
EP1530103B1 EP04104803A EP04104803A EP1530103B1 EP 1530103 B1 EP1530103 B1 EP 1530103B1 EP 04104803 A EP04104803 A EP 04104803A EP 04104803 A EP04104803 A EP 04104803A EP 1530103 B1 EP1530103 B1 EP 1530103B1
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EP
European Patent Office
Prior art keywords
model
filler
retention
ash
dependence
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP04104803A
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German (de)
French (fr)
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EP1530103A1 (en
Inventor
Niels Hardt
Michael Schwarz
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1530103A1 publication Critical patent/EP1530103A1/en
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Publication of EP1530103B1 publication Critical patent/EP1530103B1/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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/09—Uses for paper making sludge
    • Y10S162/10—Computer control of paper making variables
    • Y10S162/11—Wet end paper making variables

Definitions

  • the invention relates to a method for producing a fibrous web, in particular paper and / or board web, in which an automatic ash control takes place. It further relates to a suitable for carrying out the method computerized quality control system specified in the preamble of claim 6.
  • Art Such a method and such a quality control system are from the US 6,319,362 B 1 known.
  • this object is achieved by a method for producing a fibrous web, in particular paper and / or board web, in which an automatic ash control and an automatic retention control for reducing or suppressing a mutual rocking of the two regulations on a model for the dependence between the filler and the retention agent consumption are linked together accordingly.
  • the amount of retention agent is also increased or decreased in a respective increase or decrease of the amount of filler according to the model for the dependence between the filler addition and the retention agent consumption.
  • a mathematical model for the dependence between the filler addition and the retention agent consumption is used.
  • a further preferred embodiment is characterized in that a concentration measurement in the white water and / or an ash content measurement or a measurement of the ash addition amount is at least temporarily used to adapt the model to any new situations.
  • a self-learning system is also conceivable. This also means that optionally signal lines from corresponding sensors can be connected to the model computer.
  • the aforementioned object is also achieved by a computer-aided quality control system of a paper machine with an automatic ash control and an automatic retention control, which are linked via a model for the dependence between the filler addition and the retention agent consumption with each other to reduce mutual rocking of these two schemes or . to suppress.
  • the amount of retention agent can be increased or reduced.
  • a mathematical model is preferably again provided.
  • the quality control system can be designed in such a way that a reciprocal swaying of the ash control and the retention control is counteracted in a predictive manner via the model for the dependence between the filler addition and the retention agent consumption.
  • such an embodiment is also advantageous in which at least one sensor is connected or connectable to the model computer for at least temporary adaptation of the model to any new situations via which preferably a concentration measurement in the white water and / or an ash content measurement or a measurement of ash addition amount is feasible.
  • the corresponding link between the automatic ash control and the automatic retention control can thus be realized in particular by a corresponding programming of the computer-aided quality control system or model computer and, for example, the provision of stored link tables and / or the like.
  • an automatic adaptation of the model underlying the link to the respective operating situation is conceivable.
  • FIG. 1 While in the FIG. 1 the time course of said variables for a variety change without the inventive combination of the ash control and retention regulation is reproduced, shows the FIG. 2 the time course of these sizes for a variety change with inventively combined ash and retention control.
  • the basis weight (FG) at the roller is within 20 minutes after the beginning of the grade change in the target range, while the size "ash in the paper" after about 15 more minutes, ie about 35 minutes after the start of the variety change, is in the target range.
  • the consistency of the white water (SW consistency ) shows significant fluctuations.
  • the size "ash in the paper” in accordance with the invention coupled ash and retention control (see. FIG. 2 ) also after about 20 minutes after the beginning of the variety change in the target range.
  • the sizes "FG on roller” and “ash in the paper” reach the target range at about the same time, in this case, for example, about 20 minutes after the beginning of the grade change.
  • FIG. 2 it can be seen that as a result of the combination of the ash and retention control according to the invention or because of the simultaneous increase in the amount of retention agent, virtually no fluctuations in the size "SW substance density " or no headbox fluctuations occur any more.

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  • Paper (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

Production of a fibrous strip, especially a paper and/or cardboard strip, comprises coupling an automatic ash regulating step and an automatic retention regulating step to reduce and/or suppress a resonance rise between the two steps via a model for the dependency between the filler feed and the retention agent consumption. An independent claim is also included for a computer-assisted quality control system. Preferred Features: A mathematic model for the dependency between the filler feed and the retention agent consumption.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Faserstoffbahn, insbesondere Papier- und/oder Kartonbahn, bei dem eine automatische Ascheregelung erfolgt. Sie betrifft ferner ein zur Durchführung des Verfahrens geeignetes computergestütztes Qualitätsregelsystem der im Oberbegriff des Anspruchs 6 angegebenen Art. Ein derartiges Verfahren und ein derartiges Qualitätsregelsystem sind aus der US 6 319 362 B 1 bekannt.The invention relates to a method for producing a fibrous web, in particular paper and / or board web, in which an automatic ash control takes place. It further relates to a suitable for carrying out the method computerized quality control system specified in the preamble of claim 6. Art Such a method and such a quality control system are from the US 6,319,362 B 1 known.

In einer Papiermaschine gibt es eine Vielzahl von Qualitäts-MD-Regelungen, d.h. Längsprofilregelungen für bestimmte Qualitätsparameter der Materialbahn (MD = machine direction, Maschinenlaufrichtung). Hierzu zählen unter anderem die Retentionsregelung und die Ascheregelung. Die Retentionsregelung wird derzeit nur als Stand-Alone-Lösung implementiert. Gegenseitige Beeinflussungen zwischen der Retentionsregelung und anderen Regelungen bleiben also außer Betracht. Es hat sich nun aber gezeigt, dass dies bei der Ascheregelung zu einem gegenseitigen Aufschaukeln der Regelungen führen kann.In a paper machine, there are a variety of quality MD controls, i. Longitudinal profile control for certain quality parameters of the material web (MD = machine direction, machine direction). These include, among others, the retention control and the ash control. The retention scheme is currently implemented only as a stand-alone solution. Mutual influences between the retention scheme and other regulations thus remain out of consideration. However, it has now been shown that this can lead to a reciprocal swaying of the regulations in the case of the ash control.

Bei dem aus der US 6 319 362 B 1 bekannten Verfahren werden über die Strömung eines Füllstoffes der Papieraschegehalt und über die Strömung eines Retentionsmittels die Menge an Füllstoff in dem Siebwasser eingestellt. Dabei erfolgt ein gleichzeitiges Steuern der Strömung des Retentionsmittels und der Strömung des Füllstoffes auf der Basis eines Modells, das den Effekt der Strömung des Retentionsmittels auf die Menge des Füllstoffes im Siebwasser und den Effekt der Strömung des Füllstoffes auf den Papieraschegehalt und die Menge an Füllstoff im Siebwasser modelliert.In the from the US 6,319,362 B 1 known methods are set on the flow of a filler, the paper ash content and the flow of a retention agent, the amount of filler in the white water. In this case, a simultaneous control of the flow of the retention agent and the flow of the filler on the basis of a model, the effect of the flow of the retention agent on the amount of the filler in the white water and the effect of the flow of the filler the paper ash content and the amount of filler in the white water modeled.

Der Erfindung liegt die Aufgabe zugrunde, das Verfahren der eingangs genannten Art sowie das computergestützte Qualitätsregelsystem unter Vermeidung der zuvor genannten Nachteile weiter zu optimieren.The invention has for its object to further optimize the method of the type mentioned and the computer-aided quality control system while avoiding the aforementioned disadvantages.

Erfindungsgemäß wird diese Aufgabe gelöst durch ein Verfahren zur Herstellung einer Faserstoffbahn, insbesondere Papier- und/oder Kartonbahn, bei dem eine automatische Ascheregelung und eine automatische Retentionsregelung zur Verringerung bzw. Unterdrückung eines gegenseitigen Aufschaukelns der beiden Regelungen über ein Modell für die Abhängigkeit zwischen der Füllstoffzugabe und dem Retentionsmittelverbrauch entsprechend miteinander verknüpft werden.According to the invention, this object is achieved by a method for producing a fibrous web, in particular paper and / or board web, in which an automatic ash control and an automatic retention control for reducing or suppressing a mutual rocking of the two regulations on a model for the dependence between the filler and the retention agent consumption are linked together accordingly.

Aufgrund dieser Lösung wird auf zuverlässige Art und Weise ein gegenseitiges Aufschaukeln der beiden Regelungen verhindert, womit die Qualitätskonstanz der fertigen Faserstoffbahn bzw. des Fertigpapiers entsprechend erhöht wird. Überdies werden die Sortenwechselzeiten reduziert, nachdem die Anzahl unabhängig voneinander arbeitender Regelkreise zumindest verringert und die bisher üblichen langen Regelstrecken vermieden werden. Außer einem schnelleren Sortenwechsel wird insbesondere auch ein stabilerer Maschinenlauf erreicht.Because of this solution, a mutual rocking of the two regulations is reliably prevented, whereby the quality consistency of the finished fibrous web or the finished paper is increased accordingly. Moreover, the variety change times are reduced after the number of independently operating control loops are at least reduced and the previously usual long controlled systems are avoided. In addition to a faster grade change, a more stable machine run is achieved in particular.

Gemäß einer bevorzugten praktischen Ausgestaltung des erfindungsgemäßen Verfahrens wird bei einer jeweiligen Erhöhung oder Verringerung der Füllstoffmenge entsprechend dem Modell für die Abhängigkeit zwischen der Füllstoffzugabe und dem Retentionsmittelverbrauch auch die Menge des Retentionsmittels erhöht bzw. verringert.According to a preferred practical embodiment of the method according to the invention, the amount of retention agent is also increased or decreased in a respective increase or decrease of the amount of filler according to the model for the dependence between the filler addition and the retention agent consumption.

Bevorzugt wird ein mathematisches Modell für die Abhängigkeit zwischen der Füllstoffzugabe und dem Retentionsmittelverbrauch verwendet.Preferably, a mathematical model for the dependence between the filler addition and the retention agent consumption is used.

Über das Modell für die Abhängigkeit zwischen der Füllstoffzugabe und dem Retentionsmittelverbrauch kann einem gegenseitigen Aufschaukeln der Ascheregelung und der Retentionsregelung insbesondere prediktiv entgegengewirkt werden.By means of the model for the dependence between the filler addition and the retention agent consumption, reciprocal swaying of the ash control and the retention control can in particular be counteracted in a predictive manner.

Eine weitere bevorzugte Ausführungsform zeichnet sich dadurch aus, dass eine Konzentrationsmessung im Siebwasser und/oder eine Aschegehaltsmessung oder eine Messung der Aschezugabemenge zumindest zeitweise dazu verwendet wird, das Modell an eventuelle neue Situationen anzupassen. Es ist also insbesondere auch ein selbstlernendes System denkbar. Das bedeutet auch, dass optional Signalleitungen von entsprechenden Sensoren an den Modellrechner angeschlossen sein können.A further preferred embodiment is characterized in that a concentration measurement in the white water and / or an ash content measurement or a measurement of the ash addition amount is at least temporarily used to adapt the model to any new situations. In particular, a self-learning system is also conceivable. This also means that optionally signal lines from corresponding sensors can be connected to the model computer.

Die zuvor genannte Aufgabe wird erfindungsgemäß auch gelöst durch ein computergestütztes Qualitätsregelsystem einer Papiermaschine mit einer automatischen Ascheregelung und eine automatischen Retentionsregelung, die über ein Modell für die Abhängigkeit zwischen der Füllstoffzugabe und dem Retentionsmittelverbrauch miteinander verknüpft sind, um ein gegenseitiges Aufschaukeln dieser beiden Regelungen zu verringern bzw. zu unterdrücken.The aforementioned object is also achieved by a computer-aided quality control system of a paper machine with an automatic ash control and an automatic retention control, which are linked via a model for the dependence between the filler addition and the retention agent consumption with each other to reduce mutual rocking of these two schemes or . to suppress.

Bei einer bevorzugten praktischen Ausführungsform des erfindungsgemäßen Qualitätsregelsystems ist bei einer jeweiligen Erhöhung oder Verringerung der Füllstoffmenge entsprechend dem Modell für die Abhängigkeit zwischen der Füllstoffzugabe und dem Retentionsmittelverbrauch auch die Menge des Retentionsmittels erhöhbar bzw. verringerbar.In a preferred practical embodiment of the quality control system according to the invention, with a respective increase or decrease in the amount of filler according to the model for the dependence between the filler addition and the retention agent consumption, the amount of retention agent can be increased or reduced.

Als Modell für die Abhängigkeit zwischen der Füllstoffzugabe und dem Retentionsmittelverbrauch ist vorzugsweise wieder ein mathematisches Modell vorgesehen.As a model for the dependence between the filler addition and the retention agent consumption, a mathematical model is preferably again provided.

Das Qualitätsregelsystem kann beispielsweise so ausgelegt sein, dass über das Modell für die Abhängigkeit zwischen der Füllstoffzugabe und dem Retentionsmittelverbrauch einem gegenseitigen Aufschaukeln der Ascheregelung und der Retentionsregelung prediktiv entgegengewirkt wird.By way of example, the quality control system can be designed in such a way that a reciprocal swaying of the ash control and the retention control is counteracted in a predictive manner via the model for the dependence between the filler addition and the retention agent consumption.

Von Vorteil ist insbesondere auch eine solche Ausführung, bei der an den Modellrechner für eine zumindest zeitweise Anpassung des Modells an eventuelle neue Situationen wenigstens ein Sensor angeschlossen bzw. anschließbar ist, über den bzw. die vorzugsweise eine Konzentrationsmessung im Siebwasser und/oder eine Aschegehaltsmessung oder eine Messung der Aschezugabemenge durchführbar ist.In particular, such an embodiment is also advantageous in which at least one sensor is connected or connectable to the model computer for at least temporary adaptation of the model to any new situations via which preferably a concentration measurement in the white water and / or an ash content measurement or a measurement of ash addition amount is feasible.

Die entsprechende Verknüpfung zwischen der automatischen Ascheregelung und der automatischen Retentionsregelung kann also insbesondere durch eine entsprechende Programmierung des computergestützten Qualitätsregelsystems bzw. Modellrechners und beispielsweise die Bereitstellung gespeicherter Verknüpfungstabellen und/oder dergleichen verwirklicht sein. Dabei ist insbesondere auch eine automatische Anpassung des der Verknüpfung zugrunde liegenden Modells an die jeweilige Betriebssituation denkbar.The corresponding link between the automatic ash control and the automatic retention control can thus be realized in particular by a corresponding programming of the computer-aided quality control system or model computer and, for example, the provision of stored link tables and / or the like. In particular, an automatic adaptation of the model underlying the link to the respective operating situation is conceivable.

In der Zeichnung ist anhand zweier Diagramme rein beispielhaft ein Sortenwechsel mit erfindungsgemäß kombinierter Asche- und Retentionsregelung einem Sortenwechsel ohne eine solche kombinierte Regelung gegenübergestellt. Dabei zeigen:

Figur 1
ein schematisches Diagramm zur Darstellung eines Sortenwechsels ohne die erfindungsgemäße Kombination der Ascheregelung und Retentionsregelung und
Figur 2
ein schematisches Diagramm zur Darstellung eines Sortenwechsels mit erfindungsgemäß kombinierter Asche- und Retentionsregelung.
In the drawing, with reference to two diagrams purely by way of example, a change of grade with inventively combined ash and retention control is compared with a change of grade without such a combined control. Showing:
FIG. 1
a schematic diagram showing a variety change without the inventive combination of the ash control and retention control and
FIG. 2
a schematic diagram showing a variety change with inventively combined ash and retention control.

In den beiden theoretisch ermittelten Diagrammen der Figuren 1 und 2 sind über der Zeit t jeweils die folgenden Größen aufgetragen: "FG am Roller" (FG = Flächengewicht), "Asche im Papier", "Aschezugabe" und "SWStoffdichte" (SW = Siebwasser).In the two theoretically determined diagrams of the FIGS. 1 and 2 the following quantities are applied over time t: "FG on roller" (FG = basis weight), "ash in paper", "ash addition" and "SW substance density " (SW = white water).

Während in der Figur 1 der zeitliche Verlauf der genannten Größen für einen Sortenwechsel ohne die erfindungsgemäße Kombination der Ascheregelung und Retentionsregelung wiedergegeben ist, zeigt die Figur 2 des zeitlichen Verlauf dieser Größen für einen Sortenwechsel mit erfindungsgemäß kombinierter Asche- und Retentionsregelung.While in the FIG. 1 the time course of said variables for a variety change without the inventive combination of the ash control and retention regulation is reproduced, shows the FIG. 2 the time course of these sizes for a variety change with inventively combined ash and retention control.

Wie anhand der Figur 1 zu erkennen ist, liegt das Flächengewicht (FG) am Roller bereits nach etwa 20 Minuten nach dem Beginn des Sortenwechsels im Sollbereich, während die Größe "Asche im Papier" erst nach etwa 15 weiteren Minuten, d.h. etwa 35 Minuten nach dem Beginn des Sortenwechsels, im Sollbereich liegt. Überdies zeigt die Stoffdichte des Siebwassers (SWStoffdichte) deutliche Schwankungen.As based on the FIG. 1 it can be seen that the basis weight (FG) at the roller is within 20 minutes after the beginning of the grade change in the target range, while the size "ash in the paper" after about 15 more minutes, ie about 35 minutes after the start of the variety change, is in the target range. In addition, the consistency of the white water (SW consistency ) shows significant fluctuations.

Demgegenüber liegt die Größe "Asche im Papier" bei erfindungsgemäß gekoppelter Asche- und Retentionsregelung (vgl. Figur 2) ebenfalls nach bereits etwa 20 Minuten nach dem Beginn des Sortenwechsels im Sollbereich. Die Größen "FG am Roller" und "Asche im Papier" erreichen den Sollbereich also etwa zur gleichen Zeit, im vorliegenden Fall beispielsweise etwa 20 Minuten nach dem Beginn des Sortenwechsels. Anhand der Figur 2 ist überdies zu erkennen, dass infolge der erfindungsgemäßen Verknüpfung der Asche- und Retentionsregelung bzw. aufgrund der gleichzeitigen Erhöhung der Retentionsmittelmenge praktisch keine Schwankungen der Größe "SWStoffdichte" bzw. keine Stoffauflaufschwankungen mehr auftreten.In contrast, the size "ash in the paper" in accordance with the invention coupled ash and retention control (see. FIG. 2 ) also after about 20 minutes after the beginning of the variety change in the target range. The sizes "FG on roller" and "ash in the paper" reach the target range at about the same time, in this case, for example, about 20 minutes after the beginning of the grade change. Based on FIG. 2 Moreover, it can be seen that as a result of the combination of the ash and retention control according to the invention or because of the simultaneous increase in the amount of retention agent, virtually no fluctuations in the size "SW substance density " or no headbox fluctuations occur any more.

Claims (10)

  1. Method for producing a fibrous web, in particular a paper and/or board web, in which automatic ash control is carried out, characterized in that, moreover, automatic retention control is carried out and, in order to reduce or suppress mutual resonant build-up of the two control systems, these are linked appropriately to each other via a model for the dependence between the addition of filler and the consumption of retention aid.
  2. Method according to Claim 1, characterized in that, in the event of a respective increase or reduction in the quantity of filler, the quantity of retention aid is also increased or reduced in accordance with the model for the dependence between the addition of filler and the consumption of retention aid.
  3. Method according to Claim 1 or 2, characterized in that a mathematical model is used for the dependence between the addition of filler and the consumption of retention aid.
  4. Method according to one of the preceding claims, characterized in that a mutual resonant build-up of the ash control and the retention control is counteracted predictively via the model for the dependence between the addition of filler and the consumption of retention aid.
  5. Method according to one of the preceding claims, characterized in that a concentration measurement in the white water and/or an ash content measurement or a measurement of the quantity of ash added is used at least partly to adapt the model to possibly new situations.
  6. Computer-aided quality control system for a paper machine, in particular for implementing the method according to one of the preceding claims, with automatic ash control, characterized in that, moreover, automatic retention control is provided and, in order to reduce or suppress mutual resonant build-up of these two control systems, these are linked to each other via a model for the dependence between the addition of filler and the consumption of retention aid.
  7. Quality control system according to Claim 6, characterized in that, in the event of a respective increase or reduction in the quantity of filler, the quantity of retention aid can also be increased or reduced in accordance with the model for the dependence between the addition of filler and the consumption of retention aid.
  8. Quality control system according to Claim 6 or 7, characterized in that a mathematical model is provided for the dependence between the addition of filler and the consumption of retention aid.
  9. Quality control system according to one of the preceding claims, characterized in that a mutual resonant build-up of the ash control and the retention control is counteracted predictively via the model for the dependence between the addition of filler and the consumption of retention aid.
  10. Quality control system according to one of the preceding claims, characterized in that at least one sensor is or can be connected to the model computer in order to adapt the model to possible new situations, at least for some time, by which sensor/s a concentration measurement in the white water and/or an ash content measurement or a measurement of the quantity of ash added can preferably be carried out.
EP04104803A 2003-11-06 2004-09-30 Method for producing a fibrous web Not-in-force EP1530103B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10351771 2003-11-06
DE10351771A DE10351771A1 (en) 2003-11-06 2003-11-06 Process for producing a fibrous web

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EP1530103A1 EP1530103A1 (en) 2005-05-11
EP1530103B1 true EP1530103B1 (en) 2008-07-23

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EP (1) EP1530103B1 (en)
AT (1) ATE402431T1 (en)
DE (2) DE10351771A1 (en)

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GB2454325A (en) * 2007-10-29 2009-05-06 Orthomimetics Ltd A device for delivering a biomedical implant

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FI974327A (en) * 1997-11-25 1999-05-26 Valmet Automation Inc Method and apparatus for adjusting the properties of paper
FI103678B (en) * 1998-06-10 1999-08-13 Metso Paper Automation Oy A method of adjusting the basis weight of paper or board in a paper or kraft machine
DE19906062A1 (en) * 1999-02-12 2000-08-17 Voith Sulzer Papiertech Patent Method and device for producing a material web
DE10043142A1 (en) * 2000-08-31 2001-03-01 Voith Paper Patent Gmbh Stock inlet control uses pulp density sensors and flow meters to register the pulp condition for comparison with nominal values for deviations to be corrected rapidly by a control circuit
JP4063100B2 (en) * 2003-02-13 2008-03-19 王子製紙株式会社 Paper machine control method, control device, program, and storage medium

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DE502004007657D1 (en) 2008-09-04
US7435314B2 (en) 2008-10-14
DE10351771A1 (en) 2005-06-09
ATE402431T1 (en) 2008-08-15
EP1530103A1 (en) 2005-05-11
US20060095154A1 (en) 2006-05-04

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