EP1556546A1 - Procede de production d'une bande de matiere fibreuse, et systeme de surveillance associe - Google Patents

Procede de production d'une bande de matiere fibreuse, et systeme de surveillance associe

Info

Publication number
EP1556546A1
EP1556546A1 EP03780164A EP03780164A EP1556546A1 EP 1556546 A1 EP1556546 A1 EP 1556546A1 EP 03780164 A EP03780164 A EP 03780164A EP 03780164 A EP03780164 A EP 03780164A EP 1556546 A1 EP1556546 A1 EP 1556546A1
Authority
EP
European Patent Office
Prior art keywords
fiber suspension
monitoring system
fsd
headbox
measuring cell
Prior art date
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.)
Ceased
Application number
EP03780164A
Other languages
German (de)
English (en)
Inventor
Mathias Schwaner
Jürgen PROESSL
Joachim Henssler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1556546A1 publication Critical patent/EP1556546A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0027—Paper-making control systems controlling the forming section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/06—Indicating or regulating the thickness of the layer; Signal devices

Definitions

  • the invention relates to a method for producing a fibrous web, in particular a paper or cardboard web, from at least one fibrous suspension having a fibrous suspension density, with at least one circulating sieve, to which the fibrous suspension having a fibrous suspension height is applied by means of at least one headbox and which is applied over a number of Drainage elements is performed.
  • the invention further relates to a monitoring system according to the preamble of claim 14.
  • the properties of the fiber suspension mentioned are nowadays determined with the help of portable measuring devices, such as gamma gauge and ultra sonus, at various places in a paper or board machine. These various places are preferably in the wet area, the so-called wet end, of a paper or board machine, this wet area generally comprising the constant part, the headbox and the wire section, for example in the form of a gap or hybrid former.
  • the theoretical fiber suspension height if the Throughputs can be determined.
  • the same procedure is usually used when determining the theoretical fiber suspension density.
  • interesting measuring points of this type are, for example, the forming units of gap or hybrid formers, with accurate measurements being difficult or only possible with considerable effort in these areas due to their inaccessibility.
  • This object is achieved according to the invention in a method of the type mentioned at the outset by measuring the fiber suspension height and / or the fiber suspension density by means of at least one stationary measuring cell which is not in direct contact with the fiber suspension, in that the measured value obtained is assigned to the corresponding process control system Paper or board machine is evaluated and preferably compared with at least two predeterminable limit values (upper limit value, lower limit value), and that depending on the result of the evaluation or if at least one of the predeterminable limit values is exceeded, at least one actuator is automatically activated or influenced via the process control system to signal that the limit value has been exceeded and / or at least to initiate a corresponding countermeasure with a further increase or decrease in the chamfer Material suspension height and / or the
  • Pulp suspension density of the monitored area is counteracted. This configuration not only ensures the determination of both the fiber suspension height and the fiber suspension density at all interesting measuring points, which may also be difficult or difficult to access, it also ensures that countermeasures are automatically initiated, for example when the process control system reaches a critical value to prevent further developments and thus possible production disadvantages.
  • the measured value determined can also be used as a control variable for the already known control of the pre-dewatering section by means of the throughput quantities measured in the hybrid part (previous control variable) by means of the fiber suspension height determined and / or
  • Fibrous suspension density can be used as a new control variable.
  • the fiber suspension height and / or the fiber suspension density is measured with at least one measuring cell mounted in the headbox and / or in the dewatering element and / or in the frame of the paper or board machine and close to the surface. This stationary attachment of the measuring cell ensures a continuous and reliable measurement with constant measuring conditions and high runnability.
  • the fiber suspension height and / or the fiber suspension density - viewed perpendicularly to the machine direction - is measured at several points spaced apart from one another by means of several stationary measuring cells.
  • the distance between the measuring points can assume a value in the range from 50 mm to 1,000 mm, preferably from 100 mm to 500 mm.
  • the measurement is part of a control system, which also comprises a signal conversion following the measurement and data processing to be carried out by means of the process control system.
  • the structure of the fibrous web to be formed can be determined in the z direction and, if necessary, regulated or controlled in the machine direction in front of the measuring point by adapting the dewatering capacity (vacuum, foil angle and the like).
  • At least one of the following countermeasures is advantageously initiated: a) reducing or increasing the sieving speed of the
  • Paper or board machine b) reducing or increasing the drainage capacity in the machine running direction in front of the measuring cell; c) reducing or increasing the fiber suspension density of the fiber suspension supplied; by d) reducing or increasing the amount of fiber suspension applied to the circulating sieve.
  • At least one drive of the paper or board machine can be influenced accordingly; to change the drainage capacity, for example, the suction capacity of an upstream drainage element can be influenced accordingly; to change the fiber suspension density, at least the amount of Dilution water supplied to the pulp suspension, the vacuum levels on individual or several dewatering elements and / or forming roll vacuum, the chemical dosage, such as, for example, retention agents and the like, and / or the wire tension on the former, for example on the gap former, can be influenced accordingly and for changing the at least one headbox pump of the headbox can be influenced accordingly.
  • the aforementioned actuators can thus be drives of the paper or board machine, valves, pumps, signal transmitters and / or the like, for example.
  • an alarm signal can be generated.
  • a warning signal is first generated if a first limit value is exceeded or undershot and at least one corresponding countermeasure is initiated if a further limit value is exceeded or undershot.
  • the headbox comprises at least one headbox cover, a separating element, a lamella and / or the like and the drainage element comprises at least one forming roller, one forming strip, one skimmer strip, one support strip, one sealing strip, one drainage box, one foil box and / or the like.
  • the monitoring system accordingly comprises at least one stationary measuring cell which is not in direct contact with the fiber suspension for measuring the fiber suspension height and / or the fiber suspension density, which is connected to a process control system assigned to the paper or board machine, the of The measured value determined in the measuring cell is evaluated in the process control system and preferably compared with at least two predeterminable limit values (upper limit value, lower limit value), and depending on the result of the evaluation or if at least one of the predefinable limit values is exceeded, at least one actuator can be automatically activated or activated via the process control system can be influenced in order to signal that the limit value has been exceeded and / or at least to initiate a corresponding countermeasure which counteracts a further increase or decrease in the fiber suspension height and / or the fiber suspension density of the monitored area.
  • at least one stationary measuring cell which is not in direct contact with the fiber suspension for measuring the fiber suspension height and / or the fiber suspension density, which is connected to a process control system assigned to the paper or board machine, the of The measured value determined in the measuring cell is
  • the stationary and close to the surface measuring cell for measuring the fiber suspension height and / or the fiber suspension density is advantageously provided in the headbox and / or in the dewatering element and / or in the frame of the paper or board machine.
  • the headbox here comprises at least one headbox cover, a separating element, a lamella and / or the like, whereas the drainage element comprises at least one forming roller, one forming strip, one skimmer strip, one support strip, one sealing strip, one drainage box, one foil box and / or the like.
  • the stationary measuring cell can be embedded in a component surrounding it or it can be inserted in a preferably specially produced cavity. This way of attaching the measuring cell ensures a continuous and reliable measurement with constant measuring conditions and high runnability, whereby additional wear and contamination are avoided.
  • the stationary measuring cell can be enclosed at least on the side of the sieve or it can cover part of the surface of the
  • Form drainage element With both configurations, the advantage achieved that selective measuring errors are avoided by a uniform contact pressure across the machine width.
  • This arrangement of the measuring cell also has the advantage that it can be installed in existing drainage elements and / or in the frame without major difficulties. This makes it particularly suitable for retrofitting existing systems.
  • Fibrous suspension density - viewed perpendicularly to the machine direction - are provided at several points at a respective distance from one another.
  • the distance between the measuring points can assume a value in the range from 50 mm to 1,000 mm, preferably from 100 mm to 500 mm.
  • the measuring cells are connected to one another via corresponding connection services, in particular cables, and are fed to a preferably common signal converter, or that the measured values are transmitted to a preferably common signal converter by means of radio transmission.
  • the measuring cell of the monitoring system according to the invention comprises at least one radioactive radiator, in particular a gamma gauge, a laser unit, an ultrasound unit and / or the like. By embedding the measuring cell as described, in particular radioactive emitters are shielded accordingly. Further advantageous embodiments of the monitoring system according to the invention are specified in the further subclaims.
  • Figure 1 is a schematic representation of two drainage elements
  • Figure 2 a second schematic representation of a
  • FIG. 3 a third schematic representation of a drainage element
  • Figure 4 a schematic partial representation of a chair
  • FIGS. 6 and 7 further representations of a drainage element.
  • FIG. 1 shows a schematic representation of two drainage elements 5 in the form of strips 6, which are arranged directly one behind the other in the machine direction L (arrow), a large number of drainage elements 5 generally being arranged in this way.
  • These strips 6 can be designed, for example, as forming, skimmer, support or sealing strips.
  • Dewatering elements 5 of this type are used in the production of a fibrous web 1, in particular a paper or cardboard web, from at least one fibrous suspension 2 having a fibrous suspension density FSD.
  • the fibrous suspension 2 with a fibrous suspension height FSH is applied to at least one circulating sieve 4, which is then coated with the applied fiber suspension 2 is guided over a series of drainage elements 5.
  • the sieve 4 can in particular be part of a Fourdrinier former, a hybrid former or a gap former.
  • the two stationary measuring cells 7 shown in FIG. 1 for measuring the fiber suspension height FSH and / or the fiber suspension density FSD are attached near the surfaces 8 of the drainage elements 5.
  • the measuring cells 7 in FIG. 1 are indicatedly connected to one another via corresponding connecting lines 9 and fed to a preferably common signal converter 10, which is only shown symbolically.
  • a preferably common signal converter 10 the measurement values can also be transmitted by means of a radio transmission known to the person skilled in the art.
  • the measuring cells 7 themselves comprise at least one radioactive radiator, in particular a gamma gauge, a laser unit, an ultrasound unit and / or the like.
  • FIG. 2 shows a second schematic illustration of a drainage element 5 in the form of a forming roller 11, only the components and assemblies essential to the invention being shown in this illustration.
  • the sieve 4 with the fiber suspension 2 lying thereon is guided over a peripheral region of the forming roller 11 in the machine running direction L (arrow).
  • the stationary measuring cell 7 is inserted in a sealing strip 12, more precisely in the sealing strip 12.2 on the outlet side; however, it can also be part of the sealing strip 12 itself.
  • the inlet-side sealing strip 12.1 can additionally or alternatively be provided with a measuring cell 7 in a manner not shown.
  • the introduction itself can either be implemented as an embedding in a component surrounding it or as a classic introduction in a preferably specially produced cavity 13.
  • the measuring cell 7 is introduced into a cavity 13, which can optionally be poured out with a medium, in particular a resin, before the measuring cell is started up.
  • FIG. 3 shows a third schematic illustration of a drainage element 5 in the form of a drainage box 14.
  • the stationary measuring cell 7 is mounted near the surface 8 of the drainage box 14 touched by the sieve 4.
  • the fiber suspension 2 rests on the sieve 4 guided in the machine direction L (arrow).
  • FIG. 4 shows a schematic partial representation of a chair 15 of a paper or board machine.
  • the stationary measuring cell 7 is attached near the surface 8 of the frame 15. Furthermore, the rotating sieve 4 and the machine direction L (arrow) are shown.
  • FIG. 5 shows a schematic illustration of a headbox nozzle 16 of a headbox 3 of a paper or board machine.
  • the headbox nozzle 16 of the headbox 3 comprises a headbox cover 17, a separating element 18 and a lamella 19.
  • At least one stationary measuring cell 7 is provided on the above-mentioned elements of the headbox nozzle 16 in order to be able to determine in particular the fiber suspension density FSD as precisely as possible.
  • the headbox 3 can also be provided with a sectioned material density control (dilution water technology), as is known, for example, from the applicant's German patent application DE 40 19 593 A1 (PA04598 DE).
  • a sectioned material density control diution water technology
  • a plurality of stationary measuring cells for measuring the fiber suspension height and / or the fiber suspension density - viewed perpendicular to the machine direction - are provided at a plurality of points which are spaced apart from one another.
  • the distance between the measuring points can each have a value in the range from 50 mm to 1,000 mm, preferably from 100 mm to 500 mm.
  • the measured value for the fiber suspension height FSH and / or the fiber suspension density FSD obtained by means of at least one stationary measuring cell 7 that is not in direct contact with the fiber suspension 2 is evaluated and preferably with at least one of the process control system 20 assigned to the paper or board machine two specifiable limit values (upper limit value, lower limit value) compared.
  • At least one actuator is then automatically activated or influenced via the process control system 20 in order to signal that the limit value has been exceeded and / or to initiate a corresponding countermeasure with a further increase or humiliation of the Pulp suspension height FSH and / or the pulp suspension density FSD of the monitored area is counteracted.
  • the measurement can be part of a control system, which also includes a signal conversion following the measurement and data processing to be carried out by means of the process control system 20.
  • FIGS. 6 and 7 show two further representations of a drainage element 5 in the form of a strip 6.
  • the stationary measuring cell 7 is enclosed at least to the side of the sieve 4, whereas in FIG. 7 the stationary measuring cell 7 surrounds part of the surface the bar 6 forms.
  • the invention creates a method and an improved monitoring system of the type mentioned at the outset, by means of which an economical and reliable determination and control of both the fiber suspension height and the fiber suspension density at all interesting measuring points, which are possibly also complex or difficult to access , is made possible.
  • FSD fiber suspension density FSH fiber suspension height L machine direction (arrow)

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  • Paper (AREA)

Abstract

L'invention concerne un procédé de production d'une bande de matière fibreuse (1) à partir d'au moins une suspension de matière fibreuse (2) présentant une épaisseur de suspension de matière fibreuse (FSD). Le procédé selon l'invention implique l'utilisation d'au moins une toile (4) tournante sur laquelle est placée une certaine hauteur de suspension de matière fibreuse (2) (FSH) au moyen d'au moins une caisse de tête (3), et qui est guidée sur une rangée d'éléments de drainage (5, 6, 11, 12, 12.1, 12.2, 14). Le procédé selon l'invention comprend les étapes suivantes : la hauteur de suspension de matière fibreuse (FSH) ou l'épaisseur de suspension de matière fibreuse (FSD) est mesurée par au moins une cellule de mesure (7) montée fixe ; la valeur mesurée obtenue est exploitée dans un système de commande de processus (20) associé de la machine de fabrication de papier ou de carton correspondante ; et, en fonction du résultat de l'exploitation, le système de commande de processus (20) influe en conséquence sur au moins un actionneur, de façon automatique, pour signaler le dépassement de la valeur limite ou pour lancer une contre-mesure appropriée. L'invention concerne également un système de surveillance pour la mise en oeuvre du procédé présenté.
EP03780164A 2002-10-11 2003-10-09 Procede de production d'une bande de matiere fibreuse, et systeme de surveillance associe Ceased EP1556546A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10247555A DE10247555A1 (de) 2002-10-11 2002-10-11 Verfahren zur Herstellung einer Faserstoffbahn und Überwachungssystem
DE10247555 2002-10-11
PCT/EP2003/050706 WO2004035921A1 (fr) 2002-10-11 2003-10-09 Procede de production d'une bande de matiere fibreuse, et systeme de surveillance associe

Publications (1)

Publication Number Publication Date
EP1556546A1 true EP1556546A1 (fr) 2005-07-27

Family

ID=32038545

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03780164A Ceased EP1556546A1 (fr) 2002-10-11 2003-10-09 Procede de production d'une bande de matiere fibreuse, et systeme de surveillance associe

Country Status (5)

Country Link
US (1) US20060027350A1 (fr)
EP (1) EP1556546A1 (fr)
AU (1) AU2003288266A1 (fr)
DE (1) DE10247555A1 (fr)
WO (1) WO2004035921A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012210811A1 (de) * 2012-06-26 2014-01-02 Voith Patent Gmbh Anlage und Verfahren zur Herstellung einer Faserstoffbahn

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Publication number Priority date Publication date Assignee Title
US11488A (en) * 1854-08-08 Stanislas millet
US117282A (en) * 1871-07-25 Improvement in adjustable reflectors for lamps
SE312938B (fr) * 1964-11-17 1969-07-28 Valmet Oy
DE2946778A1 (de) * 1979-11-20 1981-05-21 Bruderhaus Maschinen Gmbh, 7410 Reutlingen Verfahren und vorrichtung zur beeinflussung der stoffdichte
FI71018C (fi) * 1983-07-06 1986-10-27 Valmet Oy Foerfarande baserande sig pao ekolodning med ultraljud foer at foelja med banbildningen och/eller massasuspensionsstroe mmn pao en viradel och/eller i en inloppslaoda i en pappers makin och anordning foer tillaempning av foerfarandet samt vanendning av foerfarandet och/eller anordningen
US4789431A (en) * 1987-07-31 1988-12-06 Impact Systems, Inc. Apparatus for sensing the thickness of a pulp suspension on the forming wire of a paper machine
DE3827084C1 (fr) * 1988-08-10 1989-11-16 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
DE4239845C2 (de) * 1992-11-05 1998-12-03 Voith Gmbh J M Verfahren zur Messung der Auswirkung von Verstellungen am Stoffauflauf und zur Korrektur des Flächengewichts- und Faserorientierungs-Querprofils
US5492601A (en) * 1994-07-29 1996-02-20 Wangner Systems Corporation Laser apparatus and method for monitoring the de-watering of stock on papermaking machines
DE19634997C2 (de) * 1996-08-30 1999-08-05 Voith Sulzer Papiermasch Gmbh Regeleinrichtung mit einer Sensoren-Mehrzahl
DE19736047A1 (de) * 1997-08-20 1999-02-25 Voith Sulzer Papiermasch Gmbh Vorrichtung und Verfahren zur Steuerung oder Regelung des Flächengewichts einer Papier- oder Kartonbahn
US6168687B1 (en) * 1998-04-24 2001-01-02 Honeywell-Measurex Corporation System and method for sheet measurement and control in papermaking machine
US6238522B1 (en) * 1999-05-12 2001-05-29 Voith Sulzer Paper Technology North America, Inc. Method and apparatus for measuring sheet thickness in a paper-making machine
FI20001391A0 (fi) * 2000-06-12 2000-06-12 Valmet Corp Menetelmä ja säätöjärjestely formerin vedenpoistoprofiilin hallitsemiseksi

Non-Patent Citations (1)

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Title
See references of WO2004035921A1 *

Also Published As

Publication number Publication date
WO2004035921A1 (fr) 2004-04-29
DE10247555A1 (de) 2004-04-22
US20060027350A1 (en) 2006-02-09
AU2003288266A1 (en) 2004-05-04

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