EP0826821A2 - Dispositif de commande comprenant plusieurs capteurs - Google Patents

Dispositif de commande comprenant plusieurs capteurs Download PDF

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Publication number
EP0826821A2
EP0826821A2 EP97114904A EP97114904A EP0826821A2 EP 0826821 A2 EP0826821 A2 EP 0826821A2 EP 97114904 A EP97114904 A EP 97114904A EP 97114904 A EP97114904 A EP 97114904A EP 0826821 A2 EP0826821 A2 EP 0826821A2
Authority
EP
European Patent Office
Prior art keywords
transverse
control device
quality feature
longitudinal
paper
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
EP97114904A
Other languages
German (de)
English (en)
Other versions
EP0826821A3 (fr
EP0826821B1 (fr
Inventor
Ulrich Begemann
Rudolf Münch
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 Sulzer Papiermaschinen 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 Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0826821A2 publication Critical patent/EP0826821A2/fr
Publication of EP0826821A3 publication Critical patent/EP0826821A3/fr
Application granted granted Critical
Publication of EP0826821B1 publication Critical patent/EP0826821B1/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
    • 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

Definitions

  • the invention relates to a control device for setting / controlling a Cross and / or longitudinal profile of a quality feature in the paper manufacturing process according to the preamble of claim 1 or a method for adjustment in the paper manufacturing process according to the preamble of claim 20.
  • the basis weight was regulated as a quality feature.
  • the basis weight of the running paper web in the area the paper machine by a traversing sensor for example measured and this measured variable in the control device for cross section control read.
  • the control device then has due of a control program of actuators for influencing the basis weight cross-section controlled.
  • a control / regulator device and a method for controlling the basis weight and fiber orientation cross profile is known from DE 42 39 845, the Disclosure content hereby fully included in this application becomes.
  • the achievable cross profile quality of the quality feature, in the present Example of the basis weight with such a cross profile control was particularly due to that during the paper making process fluctuations occurring in the longitudinal profile of the quality feature the paper web is limited. Main cause of longitudinal fluctuations when the basis weight cross-section is considered, volume flow fluctuations and fluctuations in consistency in the material jet.
  • This signal which is mixed from transverse and longitudinal components, can be used for the control device be used for control / regulation if you consider it as Cross-profile signal "averaged" over a certain longitudinal section of the paper web looks at.
  • the object of the invention is to provide a control device with the Help overcome the disadvantages mentioned according to the prior art can be, as well as a corresponding procedure for this.
  • the object is achieved by a control device one of claims 1 or 4 and by a method according to claim 22 solved.
  • the control of the transverse and / or longitudinal profile is particularly preferred the basis weight and the fiber orientation of a paper web.
  • Actuator for the basis weight cross profile or the cross profile of the fiber orientation is in a particularly advantageous embodiment density-controlled headbox used.
  • Such a headbox is sectioned, with the pulp suspension consistency and fiber orientation in the individual sections can be influenced. This is possible, for example, in that is provided in the area of the supply lines to the respective sections Arrange dilution lines that open into the supply lines and are equipped with one control valve each. Via the dilution lines can then both the consistency and the fiber orientation can be influenced in the individual sections.
  • Such headboxes are in the previously mentioned publications DE 40 19 593 and DE 43 16 054.
  • the actuator for the longitudinal profile control is Invention provided a control valve which in the common inlet to Headbox or is arranged in the common return to provide.
  • the at least two measurement signals of the two measuring sensors are supplied to a computer device.
  • the Computer device can the measurement signals, of which at least one is a measurement signal that has both a transverse and a longitudinal profile portion contains, are processed such that a cross profile portion and a longitudinal profile portion as well as a remaining part that describes the random faults, can be extracted from the recorded measurement signals. That comes from this resulting control signal for the longitudinal component is a controller for the Longitudinal profile control supplied and the signal for the cross component Cross section controller.
  • the cross or longitudinal profile controller speaks then in turn according to its control algorithm Actuators.
  • the basis weight cross and / or longitudinal profile in an advantageous embodiment intended to use a headbox controlled by density whereas as an actuator for the longitudinal profile in common Inlet or control valve arranged in the outlet, the is addressed by the longitudinal profile controller, can be provided.
  • the paper consistency can either in the common feeder to the headbox or be measured in the individual supply lines.
  • a further measurement signal that of another sensor, which is in the wet part of the Paper machine is arranged to use.
  • a sensor can the suspension height on the wire of the paper machine, that of the headbox follows, measure.
  • a fluctuation in the suspension height on the Sieve is a consequence of a volumetric flow fluctuation and thus causes constant pulp consistency a change in basis weight in the corresponding area of Web width.
  • the supply lines to the headbox a paper consistency sensor can be provided, with its Help and in connection with the suspension height measurement reliable information about the amount of paper stock can be made, which is launched in the corresponding area.
  • the mass flow in the wet part to determine the paper machine and this measure of mass flow as a further measured variable in the method according to the invention and the device according to the invention, for determining the longitudinal and transverse profile of the basis weight to be used.
  • both sensors traverse with a certain time offset, i.e. the sensors are at the same Time in different places on the paper web and take one measurement signal each.
  • the one of the two sensors remains fixed at certain points while the other the sensors moved over the paper web.
  • the invention also provides a method for adjustment / control a cross and / or longitudinal profile of a quality feature available in papermaking, which is according to the invention characterized in that in addition to a first measurement signal regarding the transverse and / or longitudinal profile of the one quality feature a further measurement signal of another quality feature was added becomes. Furthermore, the invention provides a method in which two profiles, both at least lengthways and crossways of a quality feature included, are evaluated around the pure Obtain longitudinal and transverse profiles and accordingly at least one the actuators of at least one control device for influencing a to control the measured quality characteristics.
  • the Setting / control according to the invention is intended to be exemplary below based on the basis weight longitudinal and / or basis weight cross profile a paper web can be described without this being a limitation to be understood in relation to the general idea of the invention.
  • the general idea of the invention is that at least two measurement signals for the profile of a quality feature in the paper manufacturing process be included.
  • a sectioned section for the cross section Headbox and for the longitudinal part in the headbox feed line arranged control valve are used.
  • the headbox of the paper machine is for such an arrangement 2 and the initial section of the paper web 3, which is on a screen for dewatering runs, shown.
  • the headbox 2 includes a common one Feed line 10 for the pulp suspension to be fed, which is in individual feed lines 11 to the respective sections of the headbox 2 divides.
  • the individual feed lines 11 open into a turbulence generator 12, to which the nozzle 13 of the headbox connects where the pulp suspension comes out and gets onto a sieve which the paper web 3 is formed.
  • the speed difference between the jet of material and the moving screen is a determining factor for the fiber orientation in the running paper web. If there is a speed difference, this results in a preferred orientation of the fibers in the machine running direction of the paper web.
  • fiber orientations can occur due to cross-speed components be produced in the sheet that deviate from the machine direction by an angle a.
  • the present control device it is possible, based on the above relationship, to control the fiber orientation in addition to the weight per unit area as a quality feature in the paper production process as a control element for the cross profile by correspondingly controlling a sectioned headbox.
  • the control valves are only for the first two diluent supply lines 15 of the headbox shown. It goes without saying an analogous arrangement for the other lines, although not shown, provided. Via the diluent supply lines 15 can be diluted in the individual sections of the headbox, for example dilution water or also dilute pulp suspension, be introduced so that in the individual sections of the Headbox changed both the consistency and the fiber orientation can be. These changes in turn affect, for example the basis weight cross-section of the paper web by applying the stock suspension is formed on the subsequent sieve. With help a sectioned, density controlled headbox, it is possible the basis weight cross profile as well as the fiber orientation adjust. A control is done by opening and Closing the actuator in the form of the control valve 17 for each one Supply line. The control valve 17 is actuated by a Control pulse of the controller 19, which in turn from a control computer 20th is addressed.
  • At least two Sensors measuring signals for determining the basis weight cross and / or - Record longitudinal profiles are arranged.
  • the sensors can run across the direction of travel the paper web on the measuring bridge 32 are moved over this and selectively take the cross profile of the running paper web 3 on.
  • the measuring signal then results from the running paper web over time not a pure cross profile but a profile that is made up of is composed of a transverse and a longitudinal profile portion, as in FIG. 2 shown.
  • the transverse movement of two traversing sensors a variety of possibilities are conceivable. So the two can punctiform sensors 30 and 31 at a certain distance move from each other in the same direction across the paper web or be synchronized in time so that they are against each other move.
  • the measuring sensors can be driven, for example, by means of electric motors 33, 34.
  • the values recorded by the measuring sensors are transmitted to the control computing unit 20 via measuring lines 35, 36.
  • the measurement signals of the at least two are in the control computer unit Sensors 30 and 31 processed such that from the signals the cross profile components or longitudinal profile components are extracted, except for a remainder.
  • the transverse or so determined Longitudinal profile parts are compared with the respective target profile data and then the respective controls for the cross or longitudinal profile component addressed via the controller lines 37, 38.
  • Controller 19 controls for adjusting the cross section, the individual control valves 17 of the respective sections of the headbox. For this purpose lead from the controller 19 to the respective Control valves individual control lines 39.
  • the German Reference DE 40 19 593 the disclosure content of which is hereby fully is involved.
  • the controller 40 for longitudinal profile control controls via the control line 42 the control valve 44.
  • the control valve 44 is in the present Embodiment in the common supply line 10 on the input side arranged and serves to regulate the pulp suspension amount in common inflow, with which the longitudinal profile can be influenced because Longitudinal profile fluctuations in the basis weight or also the fiber orientation profile the consequence of fluctuations in consistency in the headbox could be.
  • valve 44 for controlling the total amount of Stock suspension provided in this section.
  • the one assigned to the valve Actuator is via control lines 42 through the controller for longitudinal profile control 40 controlled.
  • the consistency in a feed line is set by the valve 17 in the diluent feed line 15 of the respective section.
  • Combining the main suspension stream with the concentration C i in the feed line 11 with a dilution stream via the diluent feed line 15, which generally has a lower concentration C i than the main suspension stream in the respective feed line 11 before the feed point, results in a stock suspension density C. total a i - c i + a j - c j in the respective section.
  • a i , a j are the proportions of the partial streams in the respective total section stream.
  • FIG. 1B shows a material density-controlled headbox in a paper machine in section for a section, as has already become known from the structure from DE 42 39 845, the disclosure content of which is hereby fully included.
  • the same components as in Fig. 1A are identified with the same reference numerals.
  • the valve 44 in the feed line and the valve 17 in the diluent feed line 15 can be clearly seen.
  • the locations S, S 1 and S 2 are identified. At these points, preferably with the aid of a sensor, the basis weight, or a measurement variable associated with the basis weight, can be detected.
  • FIG. 1C shows a further variant in which the valves 44 in the supply lines 11 in front of the feed point 70 of the dilution medium are arranged.
  • valves 17 are in the diluent supply lines 15 controlled by lines 39 from the controller for the cross section 19, while the valves 44 in the individual supply lines 11 through the Controllers for the longitudinal profile 40 can be controlled.
  • the basis weight cross profile is not recorded as a measured variable when a paper web is running, but rather a mixture of the basis weight cross and longitudinal profiles. In the event of longitudinal profile fluctuations, this means that the basis weight cross profile can only be measured as a kind of average over a certain feed distance, which is designated here by l a .
  • the basis weight cross and / or basis weight longitudinal profile essential can be recorded more precisely than before. Furthermore allows this arrangement by splitting into a cross and Longitudinal profile component, for example with the aid of a difference signal on the Exclude longitudinal fluctuations and thus the basis weight cross-section measurement to clean up from these longitudinal fluctuations.
  • the Cross-section is not only faster, but also much less noisy determine, and the cross profile control can be more frequent and also with larger Amplitude as to intervene according to the prior art. With that, on Profile fluctuations are reacted faster than before, and a finer one Regulation is possible. Also the settling time of the regulation after a change of type or other disturbances is accelerated considerably.
  • Basis weight cross and / or basis weight longitudinal profile measurements for example, only a basis weight cross and / or basis weight longitudinal profile measurement to make and another measurand in papermaking to determine the longitudinal fluctuations in the paper manufacturing process influence, or take into account can.
  • One possibility is to change the consistency of the pulp suspension as to determine further independent measured variable. This can, for example, in common inflow to the headbox or in the individual Supply lines to the headbox itself.
  • FIG. 3 Such an arrangement on a headbox is shown in FIG. 3.
  • FIG. 1 is a paper machine with a density-controlled, sectioned Headbox 2 shown.
  • the two traversing sensors 3 comprises only one traversing sensor 130, which is a mixed cross and longitudinal profile of the running paper web 3 picks up and this measurement signal via the measurement line 135 to the control computer 20 passes.
  • the sectioned headbox is as in FIG. 1 described, constructed and includes a common supply line 10 with an inlet side 111 and an outlet side 112 and individual supply lines 11 to the respective sections of the headbox, each single supply line a connecting means supply line 15, with the is assigned to respective actuators 17.
  • the cross profile control takes place by means of the controller 19, as described in FIG. 1. Deviating from Fig.

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EP97114904A 1996-08-30 1997-08-28 Dispositif de commande comprenant plusieurs capteurs Expired - Lifetime EP0826821B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19634997A DE19634997C2 (de) 1996-08-30 1996-08-30 Regeleinrichtung mit einer Sensoren-Mehrzahl
DE19634997 1996-08-30

Publications (3)

Publication Number Publication Date
EP0826821A2 true EP0826821A2 (fr) 1998-03-04
EP0826821A3 EP0826821A3 (fr) 1999-06-16
EP0826821B1 EP0826821B1 (fr) 2004-04-07

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ID=7804067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97114904A Expired - Lifetime EP0826821B1 (fr) 1996-08-30 1997-08-28 Dispositif de commande comprenant plusieurs capteurs

Country Status (5)

Country Link
US (1) US6179964B1 (fr)
EP (1) EP0826821B1 (fr)
JP (1) JP4026891B2 (fr)
CN (1) CN1190684A (fr)
DE (2) DE19634997C2 (fr)

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WO1999044058A1 (fr) * 1998-02-25 1999-09-02 Valmet Corporation Procede pour determiner un etirement irreversible et un module d'elasticite dynamique
EP1021729A1 (fr) * 1998-05-11 2000-07-26 Honeywell-Measurex Corporation Commande de partie humide pour machine a fabrication de papier
WO2000070146A2 (fr) * 1999-05-14 2000-11-23 Metso Paper, Inc. Procede et dispositif permettant de produire du papier ou du carton calandre
DE10011067A1 (de) * 2000-03-07 2001-09-13 Voith Paper Patent Gmbh Verfahren zur Herstellung und Weiterverarbeitung von Papier
US6536443B1 (en) 1999-03-02 2003-03-25 Voith Sulzer Papiertechnik Patent Gmbh Apparatus for regulating the breaking length ratio of a manufactured paper web
WO2004035921A1 (fr) * 2002-10-11 2004-04-29 Voith Paper Patent Gmbh Procede de production d'une bande de matiere fibreuse, et systeme de surveillance associe
EP1801288A1 (fr) * 2005-12-24 2007-06-27 Voith Patent GmbH Procédé et installation pour la fabrication d'une bande fibreuse

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DE19733454A1 (de) 1997-08-02 1999-02-04 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zur Erkennung und Korretur einer Faserorientierungs-Querprofil-Veränderung
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JP7119661B2 (ja) * 2018-07-06 2022-08-17 セイコーエプソン株式会社 ウェブ形成装置、ウェブ加工装置、繊維原料再生装置、及び、ウェブ形成方法
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DE3741680A1 (de) * 1987-12-09 1989-06-22 Pagendarm Gmbh Verfahren und vorrichtung zum glaetten der oberflaeche einer papierbahn
WO1989011561A1 (fr) * 1988-05-17 1989-11-30 J.M. Voith Ag Caisse de tete pour machines a papier
WO1991003600A1 (fr) * 1989-09-04 1991-03-21 Davy Mckee (Poole) Limited Ameliorations relatives a la fabrication des materiaux en bande
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DE4239845A1 (en) * 1992-11-05 1993-05-19 Voith Gmbh J M Paper-making inlet correction - uses correlated measurements from start and end of water extraction stage to calculate the settings
WO1996019615A1 (fr) * 1994-12-19 1996-06-27 Siemens Aktiengesellschaft Procede et dispositif permettant de detecter et de modifier dans le sens transversal certaines proprietes determinees de bandes de papier

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999044058A1 (fr) * 1998-02-25 1999-09-02 Valmet Corporation Procede pour determiner un etirement irreversible et un module d'elasticite dynamique
US6517679B1 (en) 1998-02-25 2003-02-11 Metso Paper, Inc. Method for determination of an irreversible stretch and of a dynamic modulus of elasticity
EP1021729A4 (fr) * 1998-05-11 2002-03-06 Honeywell Measurex Corp Commande de partie humide pour machine a fabrication de papier
EP1021729A1 (fr) * 1998-05-11 2000-07-26 Honeywell-Measurex Corporation Commande de partie humide pour machine a fabrication de papier
US6536443B1 (en) 1999-03-02 2003-03-25 Voith Sulzer Papiertechnik Patent Gmbh Apparatus for regulating the breaking length ratio of a manufactured paper web
WO2000070146A3 (fr) * 1999-05-14 2001-02-22 Valmet Corp Procede et dispositif permettant de produire du papier ou du carton calandre
WO2000070146A2 (fr) * 1999-05-14 2000-11-23 Metso Paper, Inc. Procede et dispositif permettant de produire du papier ou du carton calandre
US6875311B2 (en) 1999-05-14 2005-04-05 Metso Paper, Inc. Method and apparatus for producing calendered paper or board
US6890407B1 (en) 1999-05-14 2005-05-10 Metso Paper, Inc. Method and apparatus for producing calendered paper or board
DE10011067A1 (de) * 2000-03-07 2001-09-13 Voith Paper Patent Gmbh Verfahren zur Herstellung und Weiterverarbeitung von Papier
US6985790B2 (en) 2000-03-07 2006-01-10 Voith Paper Patent Gmbh Method for manufacturing and converting of paper
WO2004035921A1 (fr) * 2002-10-11 2004-04-29 Voith Paper Patent Gmbh Procede de production d'une bande de matiere fibreuse, et systeme de surveillance associe
EP1801288A1 (fr) * 2005-12-24 2007-06-27 Voith Patent GmbH Procédé et installation pour la fabrication d'une bande fibreuse

Also Published As

Publication number Publication date
EP0826821A3 (fr) 1999-06-16
DE19634997C2 (de) 1999-08-05
EP0826821B1 (fr) 2004-04-07
US6179964B1 (en) 2001-01-30
DE59711490D1 (de) 2004-05-13
JPH10183485A (ja) 1998-07-14
DE19634997A1 (de) 1998-03-05
JP4026891B2 (ja) 2007-12-26
CN1190684A (zh) 1998-08-19

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