EP1447473B2 - Méthode pour produire une analyse standardisée d'état de paramètres et/ou de conditions de fonctionnement influençant la qualité d'une bande de matériau fibreux durant la fabrication de celle-ci et machine pour mettre en oeuvre la méthode - Google Patents

Méthode pour produire une analyse standardisée d'état de paramètres et/ou de conditions de fonctionnement influençant la qualité d'une bande de matériau fibreux durant la fabrication de celle-ci et machine pour mettre en oeuvre la méthode Download PDF

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Publication number
EP1447473B2
EP1447473B2 EP04100401.1A EP04100401A EP1447473B2 EP 1447473 B2 EP1447473 B2 EP 1447473B2 EP 04100401 A EP04100401 A EP 04100401A EP 1447473 B2 EP1447473 B2 EP 1447473B2
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Prior art keywords
parameters
fibrous web
machine
operating conditions
registered
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EP04100401.1A
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German (de)
English (en)
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EP1447473A2 (fr
EP1447473B1 (fr
EP1447473A3 (fr
Inventor
Bernd Stibi
Stefan Natterer
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Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems

Definitions

  • the invention relates to a method for producing a standardized state analysis of parameters and / or states of operation influencing the quality of the fibrous web to be produced in the production of a fibrous web according to the preamble of claim 1. Such a method is known from the US-A-6024835 known.
  • the invention further relates to a machine for producing a fibrous web.
  • this comprehensive analysis method should serve to assess the quality of the fibrous web, in particular stability of the basis weight in machine direction (MD) and cross machine direction (CD), condition analyzes in the constant part and wet part, for example, headbox or wire section to perform and possible disturbances in the constant part and on the machine to capture and evaluate, which are causally responsible for variations in particular the basis weight longitudinal and transverse profile of the fibrous web formed.
  • MD machine direction
  • CD cross machine direction
  • this object is solved by the features of claim 1.
  • parameters and / or operating states for a specific machine in a specific production state are recorded and processed.
  • a database which preferably contains previously acquired and processed parameters and / or operating states, and the correlation with the parameters of the fibrous web to be produced
  • By comparing the current data with historical data from the database causes for disruptions in the quality of the fibrous web can be identified more quickly and thus eliminated faster and more cost-effectively.
  • WEP Wet End Process
  • the parameters and / or operating states of at least one pulp suspension used for producing the fibrous web and its at least one additive and the machine for producing the fibrous web and the constant part are detected. This ensures that all possible influencing factors on the quality of the fibrous web are actually recorded.
  • the parameters of the fibrous web to be produced are preferably recorded along the production process.
  • the parameters and / or the operating states are mostly, preferably holistically, recorded at the same time over specified periods of time online.
  • the creation of a so-called operational snapshot of the constant part and the machine is made possible, whereby a clear evaluation of the influencing variables on the quality of the fibrous web and a possible allocation of causes and / or problem areas is made possible.
  • the parameters and / or the operating states can be detected by means of standardized data sheets.
  • limit values are determined and defined in a frequency-domain-specific manner, based on at least one determined parameter of the fibrous web to be produced.
  • the detected parameters and / or the operating states of the pulp suspension and / or its at least one additive may according to the invention be, in particular, the substance composition, the freeness, the pH, the temperature and the like by means of material property investigations.
  • the detected parameters and / or the operating states of the pulp suspension and / or of the at least one additive according to the invention may be the charges, the zeta potential and the like by means of chemical analyzes his.
  • the detected parameters and / or the operating states of the constant component can according to the invention be, in particular, pulsation, substance density fluctuation, gas content, oscillation, pH value, rotational speed, temperature, flow rate measurements and the like by means of constant-part measurements.
  • the parameters and / or the operating states of the machine for producing the fibrous web can be detected according to the invention by means of vibration measurements, preferably in the area of the headbox or wire section, by means of vacuum measurements or by speed measurements of the beam or of fabrics, in particular of sieves and felts.
  • the parameters and / or the operating states of the machine for producing the fibrous web in particular machine settings, machine and device types, machine configurations, are preferably recorded, in particular as a function of defined acquisition positions and under specified production settings.
  • the parameters and / or the operating states of the machine for producing the fibrous web and / or the constant part are advantageously recorded by means of at least one, preferably several substance and water cycle balances, wherein the data necessary for the material and water cycle balancing, in particular material densities, Flow rates, retention, retention agent amount / type, defoamer amount / type, deaerator amount / type, conductivity values, cationic demand values, zeta potential values, regrind values, and adjuvant addition levels, particularly depending on specified sensing positions and under specified production settings.
  • the parameters of the fibrous web to be produced are preferably detected by means of quality investigations, such as, for example, online transmission measurements of the fibrous web and offline sample measurements of the fibrous web, in particular according to the measuring methods of Tapio and / or Boyle. Such measurements have already been distinguished in the past by good accuracies and reproducibility.
  • the parameters and / or the operating states are advantageously represented as functions of the frequency and the detected values of the parameters and / or the operating states are frequency-dependent, the detected values of the parameters and / or the operating states preferably having predetermined low, high or bandpass frequencies be filtered.
  • any deviations can be assigned to causers.
  • the inventive machine for producing a fibrous web is characterized by the use of the method according to the invention.
  • the single FIGURE shows a schematic side view of a machine for producing a fibrous web and the associated constant part.
  • a machine 1 for producing a fibrous web 5 comprises a wire section 10, which is fed via a headbox 11 at least one pulp suspension 12.
  • the fibrous web 5 is in particular a paper or board web.
  • the wire section 10 has a bottom wire 13 and a top wire 14 and, in the course of the production process, the fiber web 5 is followed by a press section 15 and a dryer section 16 with a plurality of drying cylinders 17 and deflection cylinders 18.
  • the drying section 16 follows in the running direction L (arrow) of the fibrous web 5, a coating unit 19 with downstream drying device 20, a calender 21 and a winding machine 22 for winding the finished fibrous web 5 on a winding roll 23rd
  • the basic structure of such a machine 1 for producing a fibrous web 5, as shown in the figure only by way of example, is well known from a variety of documents.
  • the machine 1 is a constant part 24 for the preparation of at least one pulp suspension 12 upstream.
  • the constant part 24 is generally used to supply the machine 1 at least one pulp suspension 12 with a constant time amount, constant pressure, constant consistency and constant composition.
  • the pulp density desired for the operation of the machine 1 is achieved by the admixture of the LC liquid to the HC liquid.
  • the parameters and / or the operating states of at least one fibrous suspension 12 used for producing the fibrous web 5 and its at least one additive and the machine 1 for producing the fibrous web 5 and the constant part 24 are detected online, preferably in entirety, at the same time over fixed periods of time.
  • the parameters and / or the operating states are preferably detected by means of standardized data sheets.
  • the parameters of the fibrous web 5 to be produced are preferably detected along the production process.
  • limit values are determined and defined in a frequency-domain-specific manner, based on at least one determined parameter of the fibrous web 5 to be produced.
  • the parameters and / or the operating states of the pulp suspension 12 and / or its at least one additive are determined by means of material property analyzes or by chemical analyzes, the constant part 24 by means of constant part measurements and the machine 1 for producing the fibrous web 5 by means of vibration measurements, by vacuum measurements or by velocity measurements of Beam or covered by clothing. Moreover, the general parameters and / or the operating conditions of the machine 1 for producing the fibrous web 5 will be detected, in particular as a function of defined detection positions and under specified production settings.
  • the parameters and / or the operating states of the machine 1 for producing the fibrous web 5 and / or the constant part 24 are detected by means of at least one, preferably several material and water cycle balances, wherein the necessary data mentioned above are detected, in particular in dependence on specified Entry items and under specified production settings.
  • the parameters of the fibrous web 5 to be produced are detected by means of quality investigations, such as, for example, online transmission measurements of the fibrous web 5 and offline sample measurements of the fibrous web 5, in particular according to the measuring methods of Tapio and / or Boyle.
  • All of the mentioned parameters and / or the operating states are represented as functions of the frequency and the detected values of the parameters and / or the operating states are evaluated frequency-domain-dependent after filtering with specified low, high or bandpass frequencies.
  • the detected values of the parameters and / or the operating states are compared with predefinable setpoint values and any deviations attributed to causers.
  • the machine 1 and the constant part 24 have a data acquisition and analysis system 30 which is in particular multi-channel and / or in particular supported by at least one computer 31. Furthermore, they have devices 32 (arrow representations) known to the person skilled in the art for measuring oscillations, in particular vibration sensors or accelerometers with preferably electronic integrators, and / or rotational speed measuring devices, in particular with reflex probes, and / or pressure sensors, in particular for measuring absolute pressures or pressure fluctuations, and / or after the Boadway method working gas content measuring devices for free and / or dissolved components and / or devices for on-line analysis of the fibrous web 5, in particular transmission sensors, and / or continuously measuring material density on.
  • devices 32 (arrow representations) known to the person skilled in the art for measuring oscillations, in particular vibration sensors or accelerometers with preferably electronic integrators, and / or rotational speed measuring devices, in particular with reflex probes, and / or pressure sensors, in particular for measuring absolute pressures or pressure fluctuations, and / or after the Boadway
  • FFT Fast Fourier Transformation
  • a low-pass adjustment is made at a frequency f c of, for example, 1000 Hz.
  • the Fourier spectra are shown, for example, up to 150 Hz. From these spectra can be periodic exciters of disturbances, for example, pumps, such as dilution water pumps, and sorters for separating fibers or other components from the Pulp suspension 12, which exceed a certain permissible size of particles in the region of the constant part identify. For pressure fluctuations caused by these applies a low-pass cutoff frequency of, for example, 10 Hz.
  • a low-pass cutoff frequency for example, 2.5 Hz and for exclusively long-wave pressure fluctuations caused, for example, by control fluctuations, a low-pass cutoff frequency of 0.1 Hz, for example the mean time, span, standard deviation, and coefficient of variation, that is, the ratio of the standard deviation to the mean in percent.
  • Substance density fluctuations are determined over a period of a few minutes, for example.
  • the measuring instrument is calibrated by a series of measurements with the addition of defined amounts of dilution water.
  • the gas content of the pulp suspension 12 has a direct influence on the formation of the fibrous web 5, on the dewatering performance in the wire section 10 and the propagation speed of pressure fluctuations (sound velocity in the medium) and on surface weight fluctuations by pressure pulsations.
  • the respective proportions in the pulp suspension 12 vary with the composition of matter and the system pressure. Therefore, measures are also taken to limit the gas content in the pulp suspension 12 at the outlet of the venting container 28 to a still permissible value.
  • vibration measurements are preferably carried out.
  • the vibrations are measured both on the driver's and on the drive side of the machine 1 in each of the three spatial directions and evaluated in accordance with the ISO Directive 10816-1 Class III (Annex A01). According to this guideline, mechanical vibrations are judged with regard to their permissibility by means of the effective value of the vibration speed.
  • the oscillation (oscillation amplitude) is additionally used as a criterion.
  • the on-line transmission measurements of the fibrous web 5 are preferably carried out in the region of the dryer section 16 and the offline sample measurements of the fibrous web 5, in particular according to the measuring methods of Tapio and / or Boyle, in the area of the winding machine 22.
  • the sensor for online transmission measurement illuminates the fibrous web 5 and provides a light-dark signal as an analogue signal. From the frequency analysis of this signal can be read off any periodic fluctuations. Due to the fluttering of the fibrous web 5, the spectrum below a certain frequency, for example, 3 Hz, can be recycled only conditionally.
  • the output signal is normalized to the basis weight according to a calibration specification. When evaluating these measurement results, optical interference effects in the paper, such as luster variations, must be taken into account, which can lead to falsifications.
  • the disorders are analyzed as to whether they occur periodically or whether they are stochastic (random); Disturbances are decomposed by means of a fast Fourier transformation method into their periodic and their random components.
  • the relevant interference potentials are then assigned to the measurements carried out simultaneously in the wet part, that is to say in the region in which a fibrous web 5 which has not yet dried or previously the fibrous stock suspension 12 is present. From the evaluation of the measurement results recommendations for the elimination of stochastic disturbances are given, for example to improve the substance mixing, to change the piping, etc.

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  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (23)

  1. Procédé pour produire une analyse standardisée d'état de paramètres et/ou de conditions de fonctionnement influençant la qualité d'une bande de matériau fibreux (5) à fabriquer durant la fabrication d'une bande de matériau fibreux (5), notamment d'une bande de papier ou de carton, les paramètres et/ou conditions de fonctionnement individuels étant déterminés à l'aide de séquences standardisées et traités au moyen de méthodes d'analyse standardisées et les paramètres et/ou conditions de fonctionnement traités étant mémorisés dans une base de données (29) et mis en corrélation avec les paramètres de la bande de matériau fibreux (5) à fabriquer, notamment son grammage, caractérisé en ce que les paramètres et/ou les conditions de fonctionnement sont majoritairement, de préférence totalement, déterminés simultanément sur la ligne de production, pendant un laps de temps déterminé,
    les paramètres et/ou les conditions de fonctionnement d'au moins une suspension de matériau fibreux (12) utilisée pour la fabrication de la bande de matériau fibreux (5) et de son au moins un additif, et aussi les paramètres et/ou les conditions de fonctionnement de la machine (1) étant déterminés pour fabriquer la bande de matériau fibreux (5) et la partie constante (24).
  2. Procédé selon la revendication 1, caractérisé en ce que les paramètres de la bande de matériau fibreux (5) à fabriquer sont de préférence déterminés au cours du processus de fabrication.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les paramètres et/ou les conditions de fonctionnement sont déterminés à l'aide de fiches techniques standardisées.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que des valeurs limites sont calculées et fixées de façon spécifique pour chaque plage de fréquences pour les paramètres et/ou les conditions de fonctionnement traités à l'aide des méthodes d'analyse standardisées, sur la base d'au moins un paramètre calculé de la bande de matériau fibreux (5) à fabriquer.
  5. Procédé selon la revendication 1, caractérisé en ce que les paramètres et/ou les conditions de fonctionnement de la partie constante (24) sont déterminés à l'aide des mesures de partie constante, notamment les mesures de pulsation, de variation d'épaisseur de matériau, de teneur en gaz, d'ondulation, de valeur de pH, de nombre de tours, de température et de débit.
  6. Procédé selon la revendication 1, caractérisé en ce que les paramètres et/ou les conditions de fonctionnement de la machine (1) sont déterminés à l'aide de mesures, réalisées de préférence dans la région superficielle du matériau et/ou dans la région de la partie tamisée, par le biais de mesures du vide ou de mesures de vitesse du faisceau ou d'étirements, notamment des tamis et feutres d'oscillation, en vue de fabriquer la bande de matériau fibreux (5).
  7. Procédé selon la revendication 1, 5 ou 6, caractérisé en ce que les paramètres et/ou les conditions de fonctionnement de la machine (1), notamment les réglages de la machine, les types de machines et d'appareils et les configurations de la machine sont déterminés en vue de fabriquer la bande de matériau fibreux (5), notamment en fonction de positions de détection fixes et selon les réglages de production déterminés.
  8. Procédé selon la revendication 1, 5, 6 ou 7, caractérisé en ce que les paramètres et/ou les conditions de fonctionnement de la machine (1) sont déterminés à l'aide d'au moins un, de préférence plusieurs bilans de circuit de matière et d'eau en vue de fabriquer la bande de matériau fibreux (5) et/ou la partie constante (24).
  9. Procédé selon la revendication 8, caractérisé en ce que les données nécessaires à la réalisation du bilan pour le circuit de matière et d'eau, notamment les épaisseurs de matière, le volume de débit, la rétention, le type/la quantité d'agent de rétention, le type/la quantité de démousseur, le type/la quantité d'aérateur, les valeurs de conductivité, les valeurs de besoin en cations, les valeurs du potentiel zêta, les valeurs de degré de trituration et les quantités ajoutées d'additif, sont déterminés, notamment en fonction des positions de détection déterminées et selon les réglages de production déterminés.
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les possibles influences de l'automatisation de différents systèmes, notamment les circuits asservis oscillants, sont identifiées et que les systèmes inertes et/ou sensibles sont optimisés.
  11. Procédé selon la revendication 2, caractérisé en ce que les paramètres de la bande de matériau fibreux (5) à fabriquer sont déterminés à l'aide d'examens de qualité, telles par exemple les mesures réalisées sur la ligne de production de la bande de matériau fibreux (5) et les mesures sur échantillons réalisées hors ligne de la bande de matériau fibreux (5), notamment selon les méthodes de mesure de Tapio et/ou de Boyle.
  12. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les paramètres et/ou les conditions de fonctionnement sont représentés sous la forme de fonctions de la fréquence et que les valeurs déterminées des paramètres et/ou des conditions de fonctionnement sont estimées en fonction de la plage de fréquences.
  13. Procédé selon la revendication 12, caractérisé en ce que les valeurs déterminées des paramètres et/ou des conditions de fonctionnement sont filtrées au moyen de fréquences passe-bas, passe-haut ou de bande passante.
  14. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les valeurs déterminées des paramètres et/ou des conditions de fonctionnement sont comparées à des valeurs théoriques et que les éventuels écarts sont associés à des causes.
  15. Machine (1) de fabrication d'une bande de matériau fibreux (5), notamment d'une bande de papier ou de carton, comprenant des moyens de mise en oeuvre du procédé selon l'une quelconque des revendications précédentes.
  16. Machine (1) selon la revendication 15, caractérisée en ce qu'elle comprend un système de détection et d'analyse des données (30), notamment doté de plusieurs canaux et/ou notamment assisté par au moins un ordinateur (31).
  17. Machine (1) selon l'une quelconque des revendications 15 ou 16, caractérisée en ce qu'elle comprend des appareils (32) de mesure des oscillations, notamment des capteurs d'oscillations ou des détecteurs d'accélération de préférence équipés d'intégrateurs électroniques.
  18. Machine (1) selon l'une quelconque des revendications 15 à 17, caractérisée en ce qu'elle comprend des appareils de mesure de la vitesse de rotation (32), notamment des sondes par réflexion.
  19. Machine (1) selon l'une quelconque des revendications 15 à 18, caractérisée en ce qu'elle comprend des capteurs de pression, notamment pour mesurer des pressions absolues et/ou des variations de pression.
  20. Machine (1) selon l'une quelconque des revendications 15 à 19, caractérisée en ce qu'elle comprend des appareils de mesure de la teneur en gaz (32) fonctionnant notamment selon le procédé de Boadway pour les particules libres et/ou dissoutes.
  21. Machine (1) selon l'une quelconque des revendications 15 à 20, caractérisée en ce qu'elle comprend des appareils (32) d'analyse sur la ligne de production de la bande de matériau fibreux (5), notamment des capteurs de transmission.
  22. Machine (1) selon l'une quelconque des revendications 15 à 21, caractérisée en ce qu'elle comporte des analyseurs de Boyle et/ou des profileurs de Tapio pour l'analyse hors ligne de production de la bande de matériau fibreux (5).
  23. Machine (1) selon l'une quelconque des revendications 15 à 22, caractérisée en ce qu'elle comporte notamment des appareils de mesure en continu d'épaisseur de matériau (32).
EP04100401.1A 2003-02-11 2004-02-04 Méthode pour produire une analyse standardisée d'état de paramètres et/ou de conditions de fonctionnement influençant la qualité d'une bande de matériau fibreux durant la fabrication de celle-ci et machine pour mettre en oeuvre la méthode Expired - Lifetime EP1447473B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003105596 DE10305596A1 (de) 2003-02-11 2003-02-11 Verfahren zum Erstellen einer standardisierten Zustandsanalyse von bei der Herstellung einer Faserstoffbahn die Qualität der herzustellenden Faerstoffbahn beeinflussenden Parametern und/oder Betriebszuständen und Maschine zur Durchführung des Verfahrens
DE10305596 2003-02-11

Publications (4)

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EP1447473A2 EP1447473A2 (fr) 2004-08-18
EP1447473A3 EP1447473A3 (fr) 2008-11-05
EP1447473B1 EP1447473B1 (fr) 2012-08-29
EP1447473B2 true EP1447473B2 (fr) 2019-05-01

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009450B4 (de) * 2005-03-07 2008-07-31 Siemens Ag Verfahren zur Qualitätssicherung bei der Papierherstellung
DE102012204067A1 (de) * 2012-03-15 2013-09-19 Voith Patent Gmbh Verfahren zur Steuerung oder Regelung eines Faserstoffbahnherstellungsprozesses
US20150292158A1 (en) 2012-09-28 2015-10-15 Voith Patent Gmbh Method for controlling the formation of a fiber web of a fiber or paper producing process
DE102019127670A1 (de) * 2019-10-15 2021-04-15 Voith Patent Gmbh Verfahren zur Herstellung von Faserstoffbahn-Fertigrollen

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US5932792A (en) † 1998-04-28 1999-08-03 Dougherty; Steven J. Apparatus for measuring entrained gas-phase content in a liquid
WO2000055421A1 (fr) † 1999-03-15 2000-09-21 Voith Paper Patent Gmbh Procede permettant d'actionner une machine pour produire et/ou façonner des bandes de materiau

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SE463269B (sv) * 1984-04-11 1990-10-29 Sensodec Oy Foerfarande och anordning foer att lokalisera fel i funktionen hos en pappersmaskins maskindelar
US6024835A (en) * 1992-08-28 2000-02-15 Fiore; Leonard F. Quality control apparatus and method for paper mill
DE19510009C2 (de) * 1995-03-23 2000-05-11 Siemens Ag Verfahren und Vorrichtung zur Prozeßführung einer Papiermaschine
FI113089B (fi) * 1999-10-06 2004-02-27 Liqum Oy Menetelmä paperinvalmistusprosessin analysoimiseksi ja sähkökemiallinen anturi nesteen analysoimiseksi
EP1290507B1 (fr) * 2000-04-05 2004-09-08 Liqum OY Procede et systeme de surveillance et d'analyse de procede de fabrication de papier
FI20021901A0 (fi) * 2002-10-24 2002-10-24 Liqum Oy Menetelmä prosessin valvomiseksi

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US5932792A (en) † 1998-04-28 1999-08-03 Dougherty; Steven J. Apparatus for measuring entrained gas-phase content in a liquid
WO2000055421A1 (fr) † 1999-03-15 2000-09-21 Voith Paper Patent Gmbh Procede permettant d'actionner une machine pour produire et/ou façonner des bandes de materiau

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"mit Pressemitteilung Technologies", Retrieved from the Internet <URL:http://www.tapiotechnologies.fi/news.html> †

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EP1447473A2 (fr) 2004-08-18
EP1447473B1 (fr) 2012-08-29
EP1447473A3 (fr) 2008-11-05
DE10305596A1 (de) 2004-09-02

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