EP0898014B1 - Procédé et appareil pour la commande ou la régulation du poids de base d'une bande de papier ou carton - Google Patents

Procédé et appareil pour la commande ou la régulation du poids de base d'une bande de papier ou carton Download PDF

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Publication number
EP0898014B1
EP0898014B1 EP98112701A EP98112701A EP0898014B1 EP 0898014 B1 EP0898014 B1 EP 0898014B1 EP 98112701 A EP98112701 A EP 98112701A EP 98112701 A EP98112701 A EP 98112701A EP 0898014 B1 EP0898014 B1 EP 0898014B1
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EP
European Patent Office
Prior art keywords
paper
stock
control loop
stock suspension
board web
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.)
Expired - Lifetime
Application number
EP98112701A
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German (de)
English (en)
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EP0898014A2 (fr
EP0898014A3 (fr
Inventor
Wolfgang Ruf
Hans Loser
Klaus Lehleiter
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Publication date
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Publication of EP0898014A3 publication Critical patent/EP0898014A3/fr
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Publication of EP0898014B1 publication Critical patent/EP0898014B1/fr
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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
    • D21F1/08—Regulating consistency
    • 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
    • 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 device and a Procedure for controlling or regulating the middle one Basis weight of a paper or cardboard web in Manufacturing process of a paper or board machine according to the preamble of claim 1 and the preamble of claim 10.
  • An essential quality factor of a paper or Cardboard web lies in the uniformity of the Basis weight of the web produced.
  • these disruptive factors include for example temperature fluctuations, Pressure fluctuations and manufacturing tolerances or also Errors in the execution or setting of the Paper machine in the manufacturing process.
  • this is Basis weight cross-section of the paper web at the end of the Paper machine measured and with a control loop Aperture on the headbox or the inflow conditions of individual flows of different concentrations for the respective sections regulated.
  • the control processes described above regulate in essentially the transverse profiles of the paper web. It is also known in the manufacturing process Paper web to use a control loop that the Basis weight of the finished paper web measures and based on the basis weight measured, this is usually the mean of the measured cross profile, the Regulates the amount of substance that is fed into the sieve cycle and thus the average basis weight of the generated paper web sets.
  • the known Paper machine with a basis weight control and the corresponding procedure for this further develop that the response times of Regulation will be greatly shortened and therefore also Variations in the papermaking process are affected can be the one in their temporal course shorter wavelength than the running time of the paper web through the paper machine.
  • the object of the invention is characterized by the features of first device claim and the first Process claim resolved.
  • the known paper machine with a Regulation of the average basis weight of a paper or Cardboard web in the manufacturing process some Headbox for machine-wide distribution of the Stock suspension on a sieve or between two sieves, at least one stock suspension feed to Headbox with at least one concentration and a first control loop with an actuator Setting the at least one concentration of at least one feed suspension, at least one means to determine the mean Basis weight of the finished web, at least one agent to change at least one concentration of at least one fed to the headbox Stock suspension and at least one agent for Adjustment of the at least one actuator Setting the at least one concentration of has at least one feed suspension, improved in that at least a second Control circuit for regulating the concentration of the Headbox fed stock suspension, added.
  • the agent for the direct or indirect determination of the Basis weight of the resulting web in the wet area of the Paper machine is arranged. It can be this preferably by a measurement directly behind the Headbox nozzle, for example with the help of a radiometric sensor.
  • a radiometric sensor there is also Possibility of the fabric suspension height on one Measuring fourdrinier sieve, this is preferably done behind the first roller and before the first Drainage unit, to be influenced by the Drainage unit arise to rule out.
  • the basis weight of the emerging web can be determined in the wet area.
  • the headbox can have two stock feeds with different stock concentrations C L , C H. These material feeds are designed such that at least one of the two material feeds splits into section streams at the headbox, which can be regulated individually.
  • C L , C H stock concentrations
  • one of the two material feeds via a further introduction regulated by the second control loop of a dilution or thickening fluid.
  • a dilution fluid for example White water.
  • the thickening fluid Possibility of additional thick matter in one of the two Introduce stock feeds in a controlled manner.
  • Other Dilution or thickening fluids such as clear water, Clear filtrate or stock suspension with higher Concentration can also be used.
  • Another embodiment of the inventive concept may be that if the second Separate sensor in the wet area of the paper machine Fibers or ash content of the formed Paper web is measured or information via the paper consistency sensor is obtained, the appropriate individual Lack of fiber or ash fed and with it be balanced. It also does not go beyond the scope of the Leave invention, if for measuring the fibrous materials and the ash content of the resulting paper web two different sensors are used.
  • the problem outlined above also becomes the characteristics of the first claim.
  • this Claim is the known method for regulating average mass per unit area of a paper or cardboard web, in which the basis weight of the web at the end of the Manufacturing process is determined, then the Deviation of the actual value from a given one Setpoint is calculated and from this the adjustment the concentration supplied to the headbox Stock suspension to correct the measured Deviation is carried out, improved in that that the basis weight of the resulting web directly or measured indirectly in the area in front of the dryer section and is fed to a second control loop.
  • the second control loop regulates the Concentration of the headbox Stock suspension.
  • This method can be further developed that the concentration of the headbox fed stock suspension over the second Control loop is regulated in that the Stock suspension feed to the headbox one Thinning or thickening liquid more variable Amount is supplied.
  • the headbox has two suspension streams of different concentrations and the concentration control of the second control loop influence on at least one of the material feeds takes. This can happen, for example, that Actuators, such as throttle valves or speed controlled pumps, according to the measured Requirements are regulated.
  • Another design option of the The idea of the invention can be that the second Control loop with a density controlled Machine-wide headbox into the existing one Fabric density control intervenes. That means everyone Actuators existing over the machine width, the actually intended to control a cross section are influenced by the second control loop II and an even machine-wide adjustment this actuators is effected. This has for example the advantage that no additional Actuators are necessary and also a simple and easy extension of an existing one Paper machine with a density controlled Headbox by adding the second Control loop with a second sensor is enabled.
  • Figure 1 shows an embodiment of the invention a paper machine with a regulation of the middle Area mass of the manufactured web.
  • the paper machine is schematic and only with those for the control loop according to the invention essential Machine parts shown. These are the Headbox 1 with the subsequent wet part 2.
  • Am At the end of the machine there is a measuring frame 5 and a winding device 6 for the finished Paper web.
  • the first control loop I for regulation the average basis weight of the paper web processes this signal according to the predetermined setpoint.
  • About the control line 13 is a valve 14 or another actuator is actuated around the thick matter feed 15 to the stock suspension feed 16 to regulate and thus the concentration of the Headbox fed stock suspension in the desired way to influence.
  • the Stock suspension feed 16 is in the closed White water circuit, takes the white water from the White water tank 10 and performs with thick matter enriched white water as a suspension of the Headbox 1 to.
  • This one now described Control loop I corresponds to the state of the art. With this control loop I can only the middle Basis weight of the paper with respect to long-wave or low-frequency fluctuations regulated become. For the regulation of a basis weight cross section are usually additional Information of the measured cross profile to one further control loop, to influence the Basis weight cross section, passed on. This Control mechanism is not in this figure considered and described.
  • FIG. Device a second control loop II.
  • This Control circuit II receives its measured values from a sensor 18, via a measuring line 19.
  • the sensor 18 is located itself in the wet part 2 of the paper machine, which has a revolving sieve 7, on which the headbox 1 puts on his stock suspension.
  • the sensor 18 is in this example at the beginning of the drainage section arranged to be as short and quick as possible to receive responsive control loop II.
  • the control loop II takes the measured information from sensor 18, the at least in some way with the Basis mass must be correlated on and calculated from this the fluctuations in the mass per unit area emerging paper web and the necessary Control interventions.
  • FIG. 1 In the present example in FIG.
  • Control loop II represents a layer thickness meter, which gives its information about the layer thickness to the Control loop II passes on the measuring line 19. Assuming that the consistency of the Stock suspension constant across the machine width runs, a statement about the Fluctuations in the basis weight at the measured point or made about their fluctuations become. Control loop II receives information that a fluctuation in the layer thickness and thus the Basis mass occurs at the measuring location, so he can now necessary change in the concentration of Stock suspension that is fed into the headbox, calculate and this over the control line 23, which too an actuator - here a valve 24 - leads, influence by the amount of an additional Fluids that via line 25 of the Stock suspension line 16 is supplied, the Headbox 1 feeds, change. That way the control loop I a fast control loop II underlain. It is understood that this is only the short fluctuations, that is, fluctuations with small wavelength can be compensated. long-wave Fluctuations are still caused by the control loop I compensated.
  • An additional improvement in the accuracy of measurement Control loop II can be achieved in that Headbox 1 a further consistency sensor 21 is provided that the additional information on the consistency of the substance via the measuring line 22 to the Control loop II passes on. With the help of this additional information about the consistency of substances in Connection with, for example Layer height measurement of the resulting paper web the second sensor 18 is an even more accurate measurement of the basis weight at the measuring location is possible.
  • a major advantage of this system shown is that the admixture of the dilution or Thickening fluids via line 25 very close to Headbox 1 can be attached. Surrender in this way very short controlled systems it enable even very short-wave fluctuations in the System to compensate while the regulations over the control loop I run sluggishly.
  • control loop II an additional filter is provided so that through this control loop only the short-wave fluctuations of the corrected average basis weight of the paper web become.
  • control loop I provided an additional filter that ensures that the control loop I only long-wave fluctuations in the medium Grammage of the paper web are corrected and thus a clear division of tasks between the Control loop I and control loop II takes place. Furthermore, an exchange of information between the control loop II and the control loop I take place, so that opposing control commands are avoided.
  • FIG. 2 shows essentially the same schematic representation of the paper machine like FIG. 1, with the headbox 1, the wet part 2 and the web take-up 6.
  • a measuring frame 5 with a sensor 5.1 provided the information on the basis weight the paper web at the end of the manufacturing process passes the control loop I and an actuator 14 to Influencing the amount of thick matter fed via line 15 to stock suspension feeder 16 controls to the headbox.
  • the Headbox 1 not only through the Stock suspension line 16, but it is an additional white water pipe 26 is provided the stock suspension of line 16 in the area of Headbox additionally diluted.
  • the splitting of line 26 into one is shown Variety of machine-wide distributed individual lines in the area of the headbox.
  • Regulated White water supply through the variety of Supply lines in the sections of the headbox 1 can a regulation of the basis weight cross section can be achieved. It goes without saying that for this basis weight cross profile control also Loop exists, however this will Control loop since it is not the average basis weight of the regulates the entire web, but only the profile regulates, not in this embodiment Considered.
  • a second control loop II is again provided his information on the adjacent mass from the wet part 2 of the Paper machine via the sensor 18 and the measuring line 19 receives.
  • the measurement of the can be supported Basis weight by a consistency sensor 21, the is attached in the headbox 1 and its Information about the measuring line 22 to Process control system passes on.
  • Is also a inductive flow meter 28 is provided which over the Measuring line 29, the control circuit II, the information of Flow through the stock suspension line 16 passes.
  • fluctuations in the amount of stock suspension supplied via the pump 17 and the control line 31 regulated by the control circuit II be and possibly by the addition of the Diluent or thickener via the line 25, also from control loop II via the line 23 is controlled, balanced. additionally there is the possibility of controlling the two Pumps 17 and 27 the ratios of the headbox supplied stock suspension via line 16 and to influence the line 26 and thus also one To intervene in the consistency.
  • FIG 3 is a paper machine with the Headbox 1 across the machine width is sectioned and material density controlled.
  • a sensor 18 directly follows the headbox Measurement of the ejection from the headbox Suspension set. In this case it is a radiometric sensor for measuring the Mass.
  • the wet part 2 follows the sensor Press section 3 and the dryer section 4 of the Paper machine.
  • the closes in the machine direction Drying section 4 of the measuring frame 5, in this Example is equipped with two sensors 5.1 and 5.2, and finally the winder 6.
  • the Sensors 5.1 and 5.2 of which at least the sensor 5.2 traversed across the machine width, give their Information on the basis weight and, if necessary also fiber orientation cross profile control loop and calculate the actual cross and longitudinal profile the paper web with subsequent control of the sectioned partial flows to the headbox.
  • Out this measuring circuit is the information about the middle Areal mass of the paper web obtained and over the Line 13 passed to the control loop I.
  • the control loop I controls the Adding thick matter via line 15 to Main suspension stream to the headbox and thus the average basis weight of the manufactured Paper web.
  • the second control loop II provided its Information from the sensor 18 via the measuring line 19 receives and an additional feed of a Dilution fluids to the stock suspension main stream regulates.
  • the short-wave fluctuations of the average mass per unit area of the paper web produced, that cannot be influenced with the known control loop I. are to be adjusted and for an improved To worry about paper quality.
  • Figures 4 and 5 show embodiments of a Paper machine which is essentially the executions from Figures 2 and 1 correspond.
  • FIG. 6 Another embodiment variant according to the invention is shown in Figure 6. This corresponds to essential to the previously described execution of the Figure 3. However, here the control loop II is like this executed that his control information on the Control line 23 to the cross section control loop III act. This makes it a machine width Adjustment of the, for the regulation of the basis weight cross profile causes existing actuators and thus a machine-wide increase or decrease in Substance concentration reached.

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  • Paper (AREA)

Claims (15)

  1. Machine à papier avec une régulation du grammage moyen d'une bande de papier ou de carton pendant le processus de fabrication, avec:
    1.1 au moins une conduite de suspension de matière (16, 26) pour amener une suspension de matière avec une concentration de matière à une caisse de tête (1);
    1.2 une caisse de tête (1) pour la répartition sur la largeur de la machine de la suspension de matière sur une toile (7) ou entre deux toiles; et
    1.3 au moins une unité de régulation (12) d'un premier circuit de régulation (I) avec
    1.3.1 au moins un moyen (5.1, 5.2) pour la détermination du grammage moyen de la bande de papier ou de carton produite;
    1.3.2 au moins une ligne (11) pour la transmission de la valeur déterminée du grammage moyen à l'unité de régulation (12);
    1.3.3 dans laquelle l'unité de régulation (12) sert pour le calcul d'un écart de la valeur réelle par rapport à une valeur de consigne prédéterminée de la bande de papier ou de carton produite et pour la détermination, à la suite de celui-ci, d'une valeur de réglage;
    1.3.4 au moins une ligne (13) pour transmettre la valeur de réglage à un organe de réglage (14);
    1.3.5 dans laquelle le au moins un organe de réglage (14) sert pour la régulation de la concentration de matière de la suspension de matière amenée à la caisse de tête (1), afin de corriger ainsi l'écart calculé de la bande de papier ou de carton produite,
    caractérisée en ce que
    1.4 il est en outre prévu au moins une unité de régulation (20) d'un second circuit de régulation (II) pour la régulation de la concentration de matière de la suspension de matière amenée à la caisse de tête (1), avec
    1.4.1 au moins un moyen (18, 21, 28) pour la détermination du grammage moyen de la bande de papier ou de carton en formation dans la région précédant la partie sèche (4);
    1.4.2 au moins une ligne (19, 22, 29) pour la transmission de la valeur déterminée du grammage moyen à l'unité de régulation (20);
    1.4.3 dans laquelle l'unité de régulation (20) sert pour le calcul d'un écart de la valeur réelle par rapport à une valeur de consigne prédéterminée de la bande de papier ou de carton en formation et pour la détermination, à la suite de celui-ci, d'une valeur de réglage;
    1.4.4 au moins une ligne (23, 31, 33) pour transmettre la valeur de réglage à un organe de réglage (17, 24, 27); et
    1.4.5 au moins un organe de réglage (17, 24, 27) pour la régulation de la concentration de matière de la suspension de matière amenée à la caisse de tête (1), afin de corriger ainsi l'écart calculé de la bande de papier ou de carton en formation.
  2. Machine à papier suivant la revendication 1, caractérisée en ce que le second circuit de régulation (II) présente en outre au moins un moyen (18, 21, 28) pour la détermination directe ou indirecte du grammage moyen de la bande de papier ou de carton en formation.
  3. Machine à papier suivant la revendication 2, caractérisée en ce que le moyen (18) pour la détermination directe ou indirecte du grammage moyen de la bande de papier ou de carton en formation est disposé dans la partie humide (2) de la machine à papier.
  4. Machine à papier suivant l'une quelconque des revendications 1 à 3, caractérisée en ce que le second circuit de régulation (II) présente au moins un organe de réglage (24) pour la régulation du débit d'agent épaississant amené au circuit de la toile.
  5. Machine à papier suivant l'une quelconque des revendications 1 à 4, caractérisée en ce que la caisse de tête (1) est alimentée par deux conduites de suspension de matière (16, 26) avec des concentrations de matière différentes (CL, CH).
  6. Machine à papier suivant la revendication 5, caractérisée en ce qu'une des conduites de suspension de matière (16, 26) est munie d'une conduite supplémentaire (25) pour l'introduction d'un fluide de dilution ou d'épaississement, régulée par le second circuit de régulation (II).
  7. Machine à papier suivant l'une des revendications 5 ou 6, caractérisée en ce qu'au moins une des conduites de suspension de matière (16, 26) vers la caisse de tête (1) se divise en une pluralité de branches avant la caisse de tête (1) et en ce qu'un moyen pour influencer le débit est présent dans chaque branche.
  8. Machine à papier suivant l'une des revendications 6 ou 7, caractérisée en ce que l'introduction du fluide de dilution ou d'épaississement est effectuée dans la conduite de suspension de matière (16, 26) avec une faible concentration de matière (CL)
  9. Machine à papier suivant l'une quelconque des revendications 6 à 8, caractérisée en ce que l'introduction du fluide de dilution ou d'épaississement est effectuée dans la conduite de suspension de matière (16, 26) avec une haute concentration de matière (CH).
  10. Procédé pour la régulation du grammage moyen d'une bande de papier ou de carton pendant le processus de fabrication dans une machine à papier, comportant les étapes suivantes:
    10.1 on amène à une caisse de tête (1) une suspension de matière avec une concentration de matière au moyen d'au moins une conduite de suspension de matière (16, 26);
    10.2 on répartit la suspension de matière sur la largeur de la machine au moyen de la caisse de tête (1) sur une toile (7) ou entre deux toiles;
    10.3 à la fin du processus de fabrication, on détermine le grammage moyen de la bande de papier ou de carton produite au moyen d'au moins un moyen (5.1, 5.2) et on transmet la valeur du grammage moyen à une unité de régulation (12) d'un premier circuit de régulation (I) ;
    10.4 au moyen de l'unité de régulation (12), on calcule un écart de la valeur réelle par rapport à une valeur de consigne prédéterminée de la bande de papier ou de carton produite et on en déduit une valeur de réglage; et
    10.5 on régule la concentration de matière de la suspension de matière amenée à la caisse de tête (1) afin de corriger l'écart calculé de la bande de papier ou de carton produite;
    caractérisé en ce que
    10.6 on mesure en outre directement ou indirectement le grammage moyen de la bande de papier ou de carton en formation dans la région précédant la partie sèche (4) au moyen d'au moins un moyen (18, 21, 28) et on transmet la valeur du grammage moyen à une unité de régulation (20) d'un second circuit de régulation (II);
    10.7 on calcule au moyen de l'unité de régulation (20) l'écart de la valeur réelle par rapport à une valeur de consigne prédéterminée de la bande de papier ou de carton en formation et on en déduit une valeur de réglage; et
    10.8 on régule la concentration de matière de la suspension de matière amenée à la caisse de tête (1) avec au moins un organe de réglage (17, 24, 27), afin de corriger ainsi l'écart calculé de la bande de papier ou de carton en formation.
  11. Procédé suivant la revendication 10, caractérisé en ce que l'on régule la concentration de matière de la suspension de matière amenée à la caisse de tête (1), par le second circuit de régulation (II), en ajoutant un fluide de dilution ou d'épaississement en quantité variable à la conduite de suspension de matière (16, 26) vers la caisse de tête (1).
  12. Procédé suivant les revendications 10 ou 11, caractérisé en ce que l'on amène à la caisse de tête (1) deux suspensions de matière de différentes concentrations de matière et en ce que la régulation de la concentration de matière du second circuit de régulation (II) exerce une influence sur la concentration de matière de la suspension de matière dans au moins une des conduites de suspension de matière (16, 26).
  13. Procédé suivant l'une quelconque des revendications 10 à 12, caractérisé en ce que l'on installe avant le second circuit de régulation (II) un filtre destiné à supprimer les oscillations à basse fréquence.
  14. Procédé suivant l'une quelconque des revendications 10 à 13, caractérisé en ce que l'on installe avant le premier circuit de régulation (I) un filtre destiné à supprimer les oscillations à haute fréquence.
  15. Procédé suivant l'une quelconque des revendications 10 à 14, caractérisé en ce qu'il se produit, entre le premier circuit de régulation (I) et le second circuit de régulation (II), un échange d'informations qui empêche une commande en sens contraire des organes de réglage respectifs.
EP98112701A 1997-08-20 1998-07-09 Procédé et appareil pour la commande ou la régulation du poids de base d'une bande de papier ou carton Expired - Lifetime EP0898014B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19736047 1997-08-20
DE19736047A DE19736047A1 (de) 1997-08-20 1997-08-20 Vorrichtung und Verfahren zur Steuerung oder Regelung des Flächengewichts einer Papier- oder Kartonbahn

Publications (3)

Publication Number Publication Date
EP0898014A2 EP0898014A2 (fr) 1999-02-24
EP0898014A3 EP0898014A3 (fr) 1999-06-16
EP0898014B1 true EP0898014B1 (fr) 2002-10-09

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EP98112701A Expired - Lifetime EP0898014B1 (fr) 1997-08-20 1998-07-09 Procédé et appareil pour la commande ou la régulation du poids de base d'une bande de papier ou carton

Country Status (3)

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US (2) US6368461B1 (fr)
EP (1) EP0898014B1 (fr)
DE (2) DE19736047A1 (fr)

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DE59805886D1 (de) 2002-11-14
US6368461B1 (en) 2002-04-09
EP0898014A3 (fr) 1999-06-16
DE19736047A1 (de) 1999-02-25
US20020117282A1 (en) 2002-08-29
US6585860B2 (en) 2003-07-01

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