EP1116825A2 - Procédé de régulation de l'orientation des fibres - Google Patents

Procédé de régulation de l'orientation des fibres Download PDF

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Publication number
EP1116825A2
EP1116825A2 EP00118922A EP00118922A EP1116825A2 EP 1116825 A2 EP1116825 A2 EP 1116825A2 EP 00118922 A EP00118922 A EP 00118922A EP 00118922 A EP00118922 A EP 00118922A EP 1116825 A2 EP1116825 A2 EP 1116825A2
Authority
EP
European Patent Office
Prior art keywords
profile
cross
speed
fiber orientation
control
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.)
Granted
Application number
EP00118922A
Other languages
German (de)
English (en)
Other versions
EP1116825A3 (fr
EP1116825B1 (fr
Inventor
Klaus Lehleiter
Holger Humberg
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 EP1116825A2 publication Critical patent/EP1116825A2/fr
Publication of EP1116825A3 publication Critical patent/EP1116825A3/fr
Application granted granted Critical
Publication of EP1116825B1 publication Critical patent/EP1116825B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/06—Regulating pulp flow
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a method for regulating a fiber orientation cross profile a fiber web produced in a paper or board machine with a means for Influencing a cross-speed profile of a fiber suspension beam at the exit of a headbox nozzle.
  • control signals then take place via computing and control units to the flow control valves and / or orifice actuators and / or removal / supply devices for fiber suspension or dilution water.
  • the inventors have recognized that the movement of the fiber suspension jet when exiting the headbox nozzle, provides information that is appropriate Analysis provide information about fiber orientation.
  • An example such measurements is the so-called cross-correlation measurement, in which the Duration of the appearance of the same optical pattern - created by laser beams - is determined at a certain distance from each other in the machine direction, from which the flow velocity in the machine direction can be calculated.
  • a Cross-correlation measurement in which the offset of an optical pattern in Transverse direction is taken into account, the speed vector transverse profile is measured and then the angular deviations of the velocity vectors from one Main direction or a transverse component of the speed in correlation to the Fiber orientation cross profile can be set.
  • optical measurement methods can also, for example, Doppler measurements with ultrasound or the like be used.
  • the invention therefore basically sees two different types of reference measurements the movement of the fiber suspension jet.
  • the evaluation of the measured values such that only the exit speed of the Beam is measured in the machine direction, because a different beam alignment correlates with a deviation of the exit speed from the Headbox nozzle.
  • the inventors therefore propose the method for controlling a fiber orientation cross profile of a fiber web produced in a paper or board machine with a means to influence a Cross-sectional velocity profile of a fiber suspension jet at the exit of a Headbox nozzle to be designed so that deviations in the fiber orientation cross profile due to measured deviations in at least of a component of the cross-speed profile.
  • the at least one measured and control-relevant component can be advantageous of the cross-speed profile the amount of the speed component in the machine direction, the amount of the speed component in Cross machine direction or the angular deviation of the fiber suspension beam be, preferably for measuring the movement of the fiber suspension beam the movement on the surface of the pulp suspension jet can be measured.
  • Cross-fiber orientation profile are created by assigning profile pairs, wherein a pair of profiles each have at least one typical value of the cross-speed profile and at least a typical value of the fiber orientation cross profile at a specific point on the train or a corresponding one Deviation from a reference value contains.
  • the determined fiber orientation cross profile can be either "online” or “offfline” can be measured, of course an “online” measurement a faster and allows more direct control.
  • the time offset can also be taken into account here be that from a measurement of certain speed components on Headbox and the later, after passing the web through the Paper machine, fiber orientation measurement at this point of the paper or Cardboard web results.
  • This method can also be advantageous by setting non-parallel ones Velocity vectors fiber orientation errors coming from the former the press or dryer section originate, are corrected.
  • a suitable manipulated variable for influencing the cross-speed profile advantageous the sectional setting and control of the gap opening of the aperture of the Headbox using a separate control unit.
  • the Sectional gap opening of a subordinate control unit, its Setpoint from the separate control unit ("master-slave principle") or from one offline measurement of fiber orientation is maintained, regulated.
  • This subordinated Control loop performs due to the faster adjustment of local changes in the gap opening to a more constant gap opening of the aperture and thus also to more stable fiber orientation cross profiles.
  • This Change of the throughput for the sectional influencing of the speed cross profile can according to the invention by throttling a sectional Volume flow, by supplying additional fluid into the sectional volume flow, by withdrawing fluid from the sectional volume flow or Combination of the above measures can be achieved.
  • control parameters determined in the course of the control process that is, empirical values the past by comparing changes in the Cross-speed profile and resulting changes in cross-fiber orientation profile, in the form of a database, preferably in at least one Control unit, save and make it available "online" to the control.
  • FIG. 1 illustrates the method according to the invention using a schematic Representation of a part of the headbox 1, arranged across the width Actuators 8a, 8b, 8c for the diagonally arranged panel 2.
  • Positions 9a, 9b, 9c show the current travel of the diaphragm 2. It is in this top view because of the inclination of the panel 2 visible that this in Area of travel 9b is deformed. This results in a narrower nozzle gap below the headbox lip.
  • the speed vectors 10a ... 10k show a fan shape on the surface of the Fibrous suspension beam 5 with the beam directions and the associated Velocity vectors.
  • a first measuring point 11 is located in the measuring device 4, for example punctiform - arranged. Due to the fixed spatial allocation to second measuring point 12 - which is designed in a matrix-like manner like a line camera - A reference system results, which determines the determination of an X partial vector 13 in Machine direction (MD) and a Y-part vector 14 in the transverse direction (CD) enables (route determination).
  • MD Machine direction
  • CD transverse direction
  • the speed components of the Determine the X and Y part vectors By knowing the flow velocity from the undisturbed area of the fiber suspension jet, the speed components of the Determine the X and Y part vectors. The two measurements can also be used to determine the determine the respective beam angle (angle of the speed vector). Measuring and Control lines were not shown in this figure for reasons of clarity drawn.
  • FIG. 2 shows the control and signal lines that are essential to the invention drawn.
  • the control unit 15 is connected to the signal lines 26a, 26b, 26c and this in turn is connected to the sensors 17a, 17b, 17c of the gap width.
  • the associated control lines 28a, 28b, 28c are on the actuators of the diaphragm 8a, 8b, 8c connected.
  • the control unit 16 receives the signal from the measuring device 27 and the fiber orientation signal of the measuring frame 24, or alternatively manually entered Fiber orientation values 25 from offline measurements.
  • This control unit 16 controls the flow-through valves 19a, 19b, 19c via the lines 29a, 29b, 29c, or via the lines 30a, 30b, 30c the substance mixing valves 18a, 18b, 18c on the headbox.
  • the control unit 15 can be via a controller coupling 23 can be connected to the control unit 16.
  • FIG. 3 shows a basic drawing for the sectional control of the gap opening.
  • the setpoint for the position, preferably sectional position of the aperture 2 of the Headbox 1 is from the separate control unit 15 of the subordinate control unit 15.1 in accordance with the master-slave principle of control technology using a cable given.
  • the control loop of the control unit 15.1 comprises an actuator 8d for the Sectional diaphragm 2, which is connected to the control unit 15.1 via the control line 28d is connected, and a sensor 17d for determining the sectional position of the sectional aperture 2, which via the signal line 26d with the control unit 15.1 is connected.
  • the method according to the invention thus provides a further, better method Measurement and influencing of fiber orientation and control loops for control the fiber orientation, in particular the fiber orientation cross profile, the Response speed of the control process is very short since the control is already for changes in the orientation of the pulp suspension beam at the beginning of the Manufacturing process reacts and not the passage of a paper web through the Paper machine with subsequent measurement of the fiber orientation cross profile must be waited for.

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  • Paper (AREA)
EP00118922A 1999-11-05 2000-09-01 Procédé de régulation de l'orientation des fibres Expired - Lifetime EP1116825B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19953225A DE19953225A1 (de) 1999-11-05 1999-11-05 Faserorientierungs-Regelung
DE19953225 1999-11-05

Publications (3)

Publication Number Publication Date
EP1116825A2 true EP1116825A2 (fr) 2001-07-18
EP1116825A3 EP1116825A3 (fr) 2002-01-23
EP1116825B1 EP1116825B1 (fr) 2004-07-21

Family

ID=7927988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00118922A Expired - Lifetime EP1116825B1 (fr) 1999-11-05 2000-09-01 Procédé de régulation de l'orientation des fibres

Country Status (2)

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EP (1) EP1116825B1 (fr)
DE (2) DE19953225A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6799083B2 (en) * 2002-02-21 2004-09-28 Abb Inc. On-line fiber orientation closed-loop control
DE102007034766A1 (de) * 2007-07-25 2009-01-29 Voith Patent Gmbh Vorrichtung und ein Verfahren zur Online-Regelung des Faserorientierungsquerprofils

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3715329A1 (de) * 1987-02-23 1988-09-01 Escher Wyss Gmbh Stoffauflauf-vorrichtung
EP0471194A1 (fr) * 1990-08-14 1992-02-19 Voith Sulzer Papiermaschinen GmbH Procédé de contrôle du courant dans une caisse de tête
US5145560A (en) * 1989-12-29 1992-09-08 Weyerhaeuser Company Method and apparatus for monitoring and controlling the velocity of a jet along the slice opening of a papermaking machine
FR2714403A1 (fr) * 1993-12-23 1995-06-30 Chleq Frote Dispositif et procédé d'introduction et de réglage fin du débit d'une suspension fibreuse distribuée par une caisse de tête sur une table de formation d'une machine à papier.
WO1997039182A1 (fr) * 1996-04-18 1997-10-23 Valmet Corporation Procede continu de regulation generale de la caisse de tete et/ou du formeur d'une machine a papier ou a carton

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19733454A1 (de) * 1997-08-02 1999-02-04 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zur Erkennung und Korretur einer Faserorientierungs-Querprofil-Veränderung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3715329A1 (de) * 1987-02-23 1988-09-01 Escher Wyss Gmbh Stoffauflauf-vorrichtung
US5145560A (en) * 1989-12-29 1992-09-08 Weyerhaeuser Company Method and apparatus for monitoring and controlling the velocity of a jet along the slice opening of a papermaking machine
EP0471194A1 (fr) * 1990-08-14 1992-02-19 Voith Sulzer Papiermaschinen GmbH Procédé de contrôle du courant dans une caisse de tête
FR2714403A1 (fr) * 1993-12-23 1995-06-30 Chleq Frote Dispositif et procédé d'introduction et de réglage fin du débit d'une suspension fibreuse distribuée par une caisse de tête sur une table de formation d'une machine à papier.
WO1997039182A1 (fr) * 1996-04-18 1997-10-23 Valmet Corporation Procede continu de regulation generale de la caisse de tete et/ou du formeur d'une machine a papier ou a carton

Also Published As

Publication number Publication date
EP1116825A3 (fr) 2002-01-23
DE50007123D1 (de) 2004-08-26
DE19953225A1 (de) 2001-05-23
EP1116825B1 (fr) 2004-07-21

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