EP3693509B1 - Forming section for a machine for producing a multi-ply fibrous web and method of producing a multi-ply fibrous web - Google Patents

Forming section for a machine for producing a multi-ply fibrous web and method of producing a multi-ply fibrous web Download PDF

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Publication number
EP3693509B1
EP3693509B1 EP20155326.0A EP20155326A EP3693509B1 EP 3693509 B1 EP3693509 B1 EP 3693509B1 EP 20155326 A EP20155326 A EP 20155326A EP 3693509 B1 EP3693509 B1 EP 3693509B1
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EP
European Patent Office
Prior art keywords
fibrous web
dryness
ply
web ply
couching
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EP20155326.0A
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German (de)
French (fr)
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EP3693509A1 (en
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Johann Moser
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Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • 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
    • D21F7/003—Indicating or regulating the moisture content of the layer
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
    • 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

Definitions

  • the present invention relates to a forming section for a machine for producing a multilayer fibrous web according to the preamble of claim 1 and a method according to the preamble of claim 8.
  • Such forming sections are, for example, from DE 103 12 836 already known in the prior art.
  • Machines for the production of paper, cardboard or tissue webs regularly comprise a forming section in which a fiber suspension is applied to a forming fabric via a headbox.
  • the fiber suspension consists predominantly of water and initially has only a small percentage of fibers by weight.
  • the fibrous web forming on the forming fabric is dewatered through the forming fabric.
  • the sections following the forming section in the machine namely in particular the press section and the dryer section, serve to remove further moisture from the fibrous web and thus further solidify the fibrous web.
  • several headboxes and forming fabrics assigned to them are regularly used in the forming section.
  • a headbox creates one layer of the multi-layer end product. It should be noted at this point that the term “multi-layer” is used as opposed to “single-layer” when the individual layers are applied to a respective forming fabric from a separate headbox. “Multi-layer”, on the other hand, means that several layers of pulp suspension are applied to a forming fabric from one and the same headbox.
  • FIG 1 shows schematically an example of a generic forming section 10 'from the prior art, which is designed to produce a two-layer fibrous web FB.
  • the forming section 10 comprises a first headbox 12' with a first forming wire 14 'assigned to the first headbox 12' for forming a first fibrous web layer L1, as well as a second headbox 22 'with a second forming wire 24' assigned to the second headbox 22 '. to form a second fibrous web layer L2.
  • the two fibrous web layers L1 and L2 are made in one by means of a couching device 30 ', here in the form of a couching roller Couch point GP coalesced with one another in order to form the two-layer fibrous web FB.
  • a couching device 30 ' here in the form of a couching roller Couch point GP coalesced with one another in order to form the two-layer fibrous web FB.
  • suction cups or support suction cups can be arranged at a predetermined distance in order to achieve a geometrically defined couching.
  • the first forming wire 14' runs endlessly clockwise in the forming section 10 '
  • the second forming wire 24' runs counterclockwise endlessly in the forming section 10 '
  • the fibrous web FB is transferred to a further section, for example a press section not shown here, of the machine for further processing, in particular for further reducing the moisture content of the fibrous web FB.
  • a number of dewatering elements are also assigned to the first forming wire 14 '.
  • first forming wire 14 ' in the vicinity of the first headbox 12', several forming strips 16 'and, somewhat further away from the first headbox 12', several vacuum suction boxes 18 ', which in Figure 1 are only indicated schematically by oblique lines or rectangles.
  • second forming wire 24 ' A number of dewatering elements are also assigned to the second forming wire 24 '.
  • the problem with the previously described forming section 10 'known from the prior art is that the layer strength, that is to say how firmly the two fibrous web layers L1 and L2 are connected to one another, is often not optimal. If the layer strength is too low, undesired delamination of the layers can occur during further processing or, ultimately, when the finished product is used. Especially with machines that are designed to produce multi-layer cardboard webs, which cardboard webs are not always the same Have basis weight, it now depends heavily on the experience of the operating personnel to set all process parameters of the machine, in particular of the forming section 10 ', so that there is always good layer strength on the end product. Otherwise, there is an increased production of rejects. It should be noted at this point that the basis weight, for example, has an effect on the speed at which the machine can be operated.
  • this object is achieved by a forming section with the features of claim 1, i.e. by a generic forming section which is particularly characterized in that it also has a control device that is designed to take the measured values of the first sensor device and the second sensor device to receive and, based on the received measured values, to set the dry content of the first fibrous web layer and / or the dry content of the second fibrous web layer before the slump.
  • the forming section according to the invention thus differs from the forming section described at the beginning and known from the prior art in that a closed control circuit is now provided which specifically sets or regulates the dryness of the first fibrous web layer and / or the second fibrous web layer.
  • the inventors have found that the dry content of the fiber web layers, in particular the difference between the dry content of the first fiber web layer and the dry content of the second fiber web layer, has a decisive influence on how good the layer strength of the finished product is in the end.
  • control device is designed to determine an actual percentage difference between the measured values of the first fibrous web layer and the second fibrous web layer, to compare the actual percentage difference with a nominal percentage difference and adjust the dry content of the first fibrous web layer and / or the dry content of the second fibrous web layer before the couching on the basis of the deviation between the percentage target difference and the percentage actual difference.
  • control device is designed to measure the dryness of the first fibrous web layer and / or the dryness of the adjust the second fibrous web layer before the couching in such a way that the dry content of the first fibrous web layer is between 2% and 5%, preferably approximately 4%, higher than the dry content of the second fibrous web layer.
  • the lower layer also called “bottom ply”, preferably has the higher dry content compared to the top layer, also called “top ply”.
  • the first fibrous web layer is preferably the "bottom ply” and the second fibrous web layer is the "top ply”.
  • the "top ply” is usually the layer of the cardboard that is visible from the outside and which usually has a lower weight per unit area than the "bottom ply”.
  • the control device is designed to set the dry content of the first fibrous web layer to at least 9%, preferably to at least 12%, before the slump.
  • the dry content of the first fibrous web layer can be set to around 12.5% and the dry content of the second fibrous web layer can be set to around 8.5% before the pulp.
  • Before couching here means that the fibrous web layers have said dryness values without any significant change even immediately before couching or the couching point.
  • control device is designed to measure the dry content of the first fibrous web layer and / or the dry content of the second fibrous web layer prior to clogging by means of controllable dewatering elements that are applied to the first fibrous web layer or the second fibrous web -Position before slumping, adjust.
  • the controllable drainage elements can comprise at least one vacuum sucker, the vacuum applied to the vacuum sucker being adjustable.
  • Another aspect of the present invention also relates to a machine for producing a multilayer cardboard web, comprising a previously described forming section according to the invention.
  • Yet another aspect of the present invention also relates to a method for producing a multi-ply fibrous web, in particular a multi-ply cardboard web, comprising the following steps: Forming a first fibrous web layer by means of at least one first headbox on a first continuously rotating forming wire assigned to the first headbox, formation a second fibrous web layer by means of at least one second headbox on a second endlessly revolving forming wire assigned to the second headbox, as well as compressing the first fibrous web layer with the second fibrous web layer, the method further comprising the following steps: measuring the dry matter content of the first fibrous web -Layer before couching, measuring the dry content of the second fibrous web layer before couching, and setting the dry content of the first fibrous web layer and / or the dry content of the second fibrous web layer before carving based on the measured values of the dry content of the first fibrous web layer and the dry content of the second fibrous web layer.
  • further data in particular from a higher-level process control system, can also be used when setting the dry content of the first Find fibrous web layer and / or the dry content of the second fibrous web layer before the gauze into account.
  • the dry content of the first fibrous web layer and / or the dry content of the second fibrous web layer is adjusted before the slump so that the dry content of the first fibrous web layer is between 2% and 5%, preferably approximately 4%, higher is than the dry matter content of the second fibrous web layer.
  • the dry content of the first fibrous web layer should be at least 9%, preferably at least 12%, and at the same time the dry content of the second fibrous web layer should be at most 9%, preferably at most 7% ceases to be lost.
  • Figure 2 shows a schematic representation, not true to scale, of an embodiment of the present invention relating to a forming section 10 for a machine for producing a multi-ply fibrous web, in particular a two-ply cardboard web.
  • the embodiment according to the invention shown differs in this from that known from the prior art and in FIG Figure 1 embodiment shown, as that it comprises a control device 32 which communicates with a first sensor device 34, a second sensor device 36, a first controllable vacuum sucker 38 and a second controllable vacuum sucker 40, as indicated by dash-dotted lines in Figure 2 is indicated.
  • the first sensor device 34 measures the dry content of the first fibrous web layer L1 shortly before the couch point GP, in which the first fibrous web layer L1 is slumped with the second fibrous web layer L2, and transmits the measured value to the control device 32 second sensor device 36 the dry content of the second fibrous web layer L2 shortly before the couch point GP and transmits the measured value to the control device 32.
  • the control device 32 determines an actual percentage difference between the measured value transmitted to it of the dry content of the first fibrous web layer L1 and the her transmitted second measured value of the dry content of the second fibrous web layer L2. The control device 32 then compares the actual percentage difference with a predetermined percentage target difference.
  • the percentage setpoint difference can be, for example, 4%, ie the dry content of the first fibrous web layer L1 should be 4% higher than the dry content of the second fibrous web layer L2.
  • the control device 32 controls at least one of the two controllable vacuum suction devices 38, 40 in such a way that the negative pressure in the at least one vacuum suction device 38 increases or decreased so that the actual percentage difference approaches the target percentage difference again.
  • the actual difference can thus essentially be kept at the specified value of the target difference through ongoing measurements and through ongoing comparisons.
  • the control device 32 can be connected to a higher-level control system, not shown here, which specifies the precise limit values and / or the percentage setpoint difference of the control device 32.
  • the regulating device 32 can also control the two controllable vacuum suction devices 38, 40 in such a way that the regulating device 32 ensures that the dry content of the first fibrous web layer L1 does not fall below a certain first limit value, whereas the dryness of the second fibrous web layer L2 does not fall below a certain second Limit value not fallen below.
  • the first limit value can be 9% and the second limit value 7%, for example.
  • the forming section according to the invention or the method according to the invention can ensure that there is always good layer strength on the finished product and that no web compression occurs.
  • the forming section 10 also differs from that in FIG Figure 2 represents can be formed.
  • the first forming wire 14 and / or the second forming wire 24 can also be assigned a respective upper wire in order to achieve the dewatering of the first fibrous web layer L1 and / or second fibrous web layer L2 even more efficiently.

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Description

Die vorliegende Erfindung betrifft eine Formierpartie für eine Maschine zur Herstellung einer mehrlagigen Faserstoffbahn gemäß dem Oberbegriff des Anspruch 1 und ein Verfahren gemäß dem Oberbegriff des Anspruch 8.The present invention relates to a forming section for a machine for producing a multilayer fibrous web according to the preamble of claim 1 and a method according to the preamble of claim 8.

Derartige Formierpartien sind beispielsweise aus der DE 103 12 836 im Stand der Technik bereits bekannt. Maschinen zur Herstellung von Papier-, Karton- oder Tissuebahnen umfassen regelmäßig eine Formierpartie, in der eine Faserstoffsuspension über einen Stoffauflauf auf ein Formiersieb aufgebracht wird. Die Faserstoffsuspension besteht ganz überwiegend aus Wasser und weist anfänglich nur einen geringen Gewichtsanteil an Fasern auf. Durch das Formiersieb hindurch erfolgt eine Entwässerung der sich auf dem Formiersieb bildenden Faserstoffbahn. Die sich in der Maschine der Formierpartie anschließenden Partien, nämlich insbesondere die Pressenpartie und die Trockenpartie, dienen dazu, der Faserstoffbahn weitere Feuchtigkeit zu entziehen und die Faserstoffbahn somit weiter zu verfestigen. Bei der Herstellung von mehrlagigen Produkten kommen regelmäßig mehrere Stoffaufläufe und diesen zugeordnete Formiersiebe in der Formierpartie zum Einsatz. Dabei erzeugt ein Stoffauflauf jeweils eine Lage des mehrlagigen Endprodukts. Es sei an dieser Stelle angemerkt, dass von "mehrlagig" im Gegensatz zu "einlagig" gesprochen wird, wenn die einzelnen Lagen aus jeweils einem separaten Stoffauflauf auf ein jeweiliges Formiersieb aufgebracht werden. "Mehrschichtig" bedeutet hingegen, dass mehrere Schichten an Faserstoffsuspension von ein und demselben Stoffauflauf auf ein Formiersieb aufgebracht werden.Such forming sections are, for example, from DE 103 12 836 already known in the prior art. Machines for the production of paper, cardboard or tissue webs regularly comprise a forming section in which a fiber suspension is applied to a forming fabric via a headbox. The fiber suspension consists predominantly of water and initially has only a small percentage of fibers by weight. The fibrous web forming on the forming fabric is dewatered through the forming fabric. The sections following the forming section in the machine, namely in particular the press section and the dryer section, serve to remove further moisture from the fibrous web and thus further solidify the fibrous web. In the manufacture of multi-layer products, several headboxes and forming fabrics assigned to them are regularly used in the forming section. A headbox creates one layer of the multi-layer end product. It should be noted at this point that the term “multi-layer” is used as opposed to “single-layer” when the individual layers are applied to a respective forming fabric from a separate headbox. “Multi-layer”, on the other hand, means that several layers of pulp suspension are applied to a forming fabric from one and the same headbox.

Figur 1 zeigt schematisch ein Beispiel einer gattungsgemäßen Formierpartie 10' aus dem Stand der Technik, welche ausgebildet ist, eine zweilagige Faserstoffbahn FB herzustellen. Hierzu umfasst die Formierpartie 10' einen ersten Stoffauflauf 12' mit einem dem ersten Stoffauflauf 12' zugeordneten ersten Formiersieb 14' zur Bildung einer ersten Faserstoffbahn-Lage L1, sowie einen zweiten Stoffauflauf 22' mit einem dem zweiten Stoffauflauf 22' zugeordneten zweiten Formiersieb 24' zur Bildung einer zweiten Faserstoffbahn-Lage L2. Die beiden Faserstoffbahn-Lagen L1 und L2 werden mittels einer Gautschvorrichtung 30', hier in Form einer Gautschwalze, in einem Gautschpunkt GP miteinander vergautscht, um die zweilagige Faserstoffbahn FB zu bilden. Vor und hinter der Gautschwalze 30' können mit einem vorbestimmten Abstand Sauger bzw. Stützsauger angeordnet sein, um eine geometrisch definierte Vergautschung zu erzielen. In der Blickrichtung der Figur 1, welche zum Beispiel eine Blickrichtung von der Führerseite der Formierpartie 10' auf selbige sein kann, läuft das erste Formiersieb 14' im Uhrzeigersinn endlos in der Formierpartie 10' um, wohingegen das zweite Formiersieb 24' entgegen dem Uhrzeigersinn endlos in der Formierpartie 10' umläuft, so wie dies durch entsprechende Pfeile in Figur 1 angedeutet ist. Nach der Formierpartie 10' wir die Faserstoffbahn FB an eine weitere Partie, zum Beispiel eine hier nicht dargestellte Pressenpartie, der Maschine zur weiteren Verarbeitung, insbesondere zur weiteren Reduzierung des Feuchtegehalts der Faserstoffbahn FB, übergeben. Figure 1 shows schematically an example of a generic forming section 10 'from the prior art, which is designed to produce a two-layer fibrous web FB. For this purpose, the forming section 10 'comprises a first headbox 12' with a first forming wire 14 'assigned to the first headbox 12' for forming a first fibrous web layer L1, as well as a second headbox 22 'with a second forming wire 24' assigned to the second headbox 22 '. to form a second fibrous web layer L2. The two fibrous web layers L1 and L2 are made in one by means of a couching device 30 ', here in the form of a couching roller Couch point GP coalesced with one another in order to form the two-layer fibrous web FB. In front of and behind the couch roll 30 ', suction cups or support suction cups can be arranged at a predetermined distance in order to achieve a geometrically defined couching. In the direction of the Figure 1 which, for example, can be viewed from the driver's side of the forming section 10 'towards the same, the first forming wire 14' runs endlessly clockwise in the forming section 10 ', whereas the second forming wire 24' runs counterclockwise endlessly in the forming section 10 ' , as indicated by the corresponding arrows in Figure 1 is indicated. After the forming section 10 ', the fibrous web FB is transferred to a further section, for example a press section not shown here, of the machine for further processing, in particular for further reducing the moisture content of the fibrous web FB.

Dem ersten Formiersieb 14' sind zudem eine Reihe von Entwässerungselementen zugeordnet. Insbesondere sind innerhalb des ersten Formiersiebs 14' in der Nähe des ersten Stoffauflaufs 12' mehrere Formierleisten 16' und etwas weiter entfernt von dem ersten Stoffauflauf 12' mehrere Vakuumsaugkästen 18' angeordnet, welche in Figur 1 lediglich schematisch durch schräge Striche, respektive Rechtecke angedeutet sind. Ebenso sind dem zweiten Formiersieb 24' eine Reihe von Entwässerungselementen zugeordnet. Insbesondere sind innerhalb des zweiten Formiersiebs 24' in der Nähe des zweiten Stoffauflaufs 22' mehrere Formierleisten 26' und etwas weiter entfernt von dem zweiten Stoffauflauf 22' mehrere Vakuumsaugkästen 28' angeordnet, welche in Figur 1 ebenfalls lediglich schematisch durch schräge Striche, respektive Rechtecke angedeutet sind.A number of dewatering elements are also assigned to the first forming wire 14 '. In particular, within the first forming wire 14 ', in the vicinity of the first headbox 12', several forming strips 16 'and, somewhat further away from the first headbox 12', several vacuum suction boxes 18 ', which in Figure 1 are only indicated schematically by oblique lines or rectangles. A number of dewatering elements are also assigned to the second forming wire 24 '. In particular, within the second forming wire 24 ', in the vicinity of the second headbox 22', a plurality of forming strips 26 'and, somewhat further away from the second headbox 22', a plurality of vacuum suction boxes 28 ', which in Figure 1 are also only indicated schematically by oblique lines or rectangles.

Problematisch bei der zuvor beschriebenen, aus dem Stand der Technik bekannten Formierpartie 10' ist, dass die Lagenfestigkeit, also wie fest die beiden Faserstoffbahn-Lagen L1 und L2 miteinander verbunden sind, häufig nicht optimal ist. Ist die Lagenfestigkeit zu gering, kann es in der Weiterverarbeitung oder zuletzt beim Gebrauch des fertigen Produkts zu einer unerwünschten Delamination der Lagen kommen. Insbesondere bei Maschinen, die dazu ausgebildet sind, mehrlagige Kartonbahnen herzustellen, welche Kartonbahnen nicht immer dasselbe Flächengewicht aufweisen, hängt es heute stark von der Erfahrung des Bedienpersonals ab, alle Prozessparameter der Maschine, insbesondere der Formierpartie 10' so einzustellen, dass stets eine gute Lagenfestigkeit am Endprodukt gegeben ist. Andernfalls kommt es zur erhöhten Produktion von Ausschuss. Es sei an dieser Stelle angemerkt, dass das Flächengewicht zum Beispiel eine Auswirkung auf die Geschwindigkeit hat, mit der die Maschine betrieben werden kann.The problem with the previously described forming section 10 'known from the prior art is that the layer strength, that is to say how firmly the two fibrous web layers L1 and L2 are connected to one another, is often not optimal. If the layer strength is too low, undesired delamination of the layers can occur during further processing or, ultimately, when the finished product is used. Especially with machines that are designed to produce multi-layer cardboard webs, which cardboard webs are not always the same Have basis weight, it now depends heavily on the experience of the operating personnel to set all process parameters of the machine, in particular of the forming section 10 ', so that there is always good layer strength on the end product. Otherwise, there is an increased production of rejects. It should be noted at this point that the basis weight, for example, has an effect on the speed at which the machine can be operated.

Es ist daher Aufgabe der vorliegenden Erfindung, eine Formierpartie bereitzustellen, welche das zuvor genannte Problem löst oder zumindest verringert.It is therefore the object of the present invention to provide a forming section which solves or at least reduces the aforementioned problem.

Diese Aufgabe wird gemäß der vorliegenden Erfindung durch eine Formierpartie mit den Merkmalen von Anspruch 1 gelöst, also durch eine gattungsgemäße Formierpartie, die sich besonders dadurch auszeichnet, dass sie ferner eine Regelvorrichtung aufweist, die ausgebildet ist, die Messwerte der ersten Sensorvorrichtung und der zweiten Sensorvorrichtung zu empfangen und basierend auf den empfangenden Messwerten den Trockengehalt der ersten Faserstoffbahn-Lage und/oder den Trockengehalt der zweiten Faserstoffbahn-Lage vor dem Vergautschen einzustellen.According to the present invention, this object is achieved by a forming section with the features of claim 1, i.e. by a generic forming section which is particularly characterized in that it also has a control device that is designed to take the measured values of the first sensor device and the second sensor device to receive and, based on the received measured values, to set the dry content of the first fibrous web layer and / or the dry content of the second fibrous web layer before the slump.

Damit unterscheidet sich die erfindungsgemäße Formierpartie von der eingangs beschriebenen, aus dem Stand der Technik bekannten Formierpartie darin, dass nunmehr ein geschlossener Regelkreislauf vorgesehen ist, der den Trockengehalt der ersten Faserstoffbahn-Lage und/oder der zweiten Faserstoffbahn-Lage gezielt einstellt bzw. regelt. Die Erfinder haben herausgefunden, dass der Trockengehalt der Faserstoffbahn-Lagen, insbesondere die Differenz zwischen dem Trockengehalt der ersten Faserstoffbahn-Lage und dem Trockengehalt der zweiten Faserstoffbahn-Lage einen maßgeblichen Einfluss darauf hat, wie gut am Ende die Lagenfestigkeit beim fertigen Produkt ist.The forming section according to the invention thus differs from the forming section described at the beginning and known from the prior art in that a closed control circuit is now provided which specifically sets or regulates the dryness of the first fibrous web layer and / or the second fibrous web layer. The inventors have found that the dry content of the fiber web layers, in particular the difference between the dry content of the first fiber web layer and the dry content of the second fiber web layer, has a decisive influence on how good the layer strength of the finished product is in the end.

In Weiterbildung der vorliegenden Erfindung wird vorgeschlagen, dass die Regelvorrichtung ausgebildet ist, eine prozentuale Ist-Differenz zwischen den Messwerten der ersten Faserstoffbahn-Lage und der zweiten Faserstoffbahn-Lage zu bestimmen, die prozentuale Ist-Differenz mit einer prozentualen Soll-Differenz zu vergleichen und den Trockengehalt der ersten Faserstoffbahn-Lage und/oder den Trockengehalt der zweiten Faserstoffbahn-Lage vor dem Vergautschen auf Basis der Abweichung zwischen prozentualer Soll-Differenz und prozentualer Ist-Differenz einzustellen.In a further development of the present invention, it is proposed that the control device is designed to determine an actual percentage difference between the measured values of the first fibrous web layer and the second fibrous web layer, to compare the actual percentage difference with a nominal percentage difference and adjust the dry content of the first fibrous web layer and / or the dry content of the second fibrous web layer before the couching on the basis of the deviation between the percentage target difference and the percentage actual difference.

Versuche haben gezeigt, dass es, insbesondere bei der Herstellung von zweischichtigen Karton-Produkten, bzw. Board- und Containerboard-Produkten, für ganz unterschiedliche Stoffsysteme, die dem Fachmann auf diesem Gebiet hinlänglich bekannt sind, wie zum Beispiel OCC/OCC-Eintrag oder DIP/OCC-Eintrag oder Virgin/OCC-Eintrag oder Virgin/mix OCC-Virgin oder auch Virgin/Virgin, hinsichtlich der Lagenfestigkeit durchweg vorteilhaft ist, wenn die Regelvorrichtung ausgebildet ist, den Trockengehalt der ersten Faserstoffbahn-Lage und/oder den Trockengehalt der zweiten Faserstoffbahn-Lage vor dem Vergautschen derart einzustellen, dass der Trockengehalt der ersten Faserstoffbahn-Lage zwischen 2% und 5%, vorzugsweise ungefähr 4%, höher ist als der Trockengehalt der zweiten Faserstoffbahn-Lage. Vorzugsweise weist dabei die untere Lage, auch "Bottom-Ply" genannt, den höheren Trockengehalt gegenüber der Decklage, auch "Top-Ply" genannt, auf. Mit anderen Worten handelt es sich bei der ersten Faserstoffbahn-Lage vorzugsweise um die "Bottom-Ply" und bei der zweiten Faserstoffbahn-Lage um die "Top-Ply". Bei der "Top-Ply" handelt es sich in der Regel um die von außen sichtbare Lage des Kartons, die für gewöhnlich ein geringeres Flächengewicht aufweist als die "Bottom-Ply".Tests have shown that, especially in the production of two-layer cardboard products, or board and container board products, it is necessary for very different material systems that are sufficiently known to the person skilled in the art, such as OCC / OCC entry or DIP / OCC entry or Virgin / OCC entry or Virgin / mix OCC-Virgin or also Virgin / Virgin, with regard to the layer strength, is consistently advantageous if the control device is designed to measure the dryness of the first fibrous web layer and / or the dryness of the adjust the second fibrous web layer before the couching in such a way that the dry content of the first fibrous web layer is between 2% and 5%, preferably approximately 4%, higher than the dry content of the second fibrous web layer. The lower layer, also called “bottom ply”, preferably has the higher dry content compared to the top layer, also called “top ply”. In other words, the first fibrous web layer is preferably the "bottom ply" and the second fibrous web layer is the "top ply". The "top ply" is usually the layer of the cardboard that is visible from the outside and which usually has a lower weight per unit area than the "bottom ply".

Ferner hat es sich als vorteilhaft hinsichtlich der Verdrückungen der ersten Faserstoffbahnlage erwiesen, wenn die Regelvorrichtung ausgebildet ist, den Trockengehalt der ersten Faserstoffbahn-Lage auf wenigstens 9%, vorzugsweise auf wenigstens 12%, vor dem Vergautschen einzustellen. Zugleich ist es vorteilhaft, den Trockengehalt der zweiten Faserstoffbahn-Lage auf höchstens 9%, vorzugsweise auf höchstens 7%, vor dem Vergautschen einzustellen. Beispielsweise kann der Trockengehalt der ersten Faserstoffbahn-Lage auf rund 12,5% und der Trockengehalt der zweiten Faserstoffbahn-Lage rund 8,5% vor dem Vergautschen eingestellt werden. "Vor dem Vergautschen" bedeutet hierbei, dass die Faserstoffbahn-Lagen die besagten Trockengehaltswerte ohne nennenswerte Änderung auch noch unmittelbar vor dem Gautschen bzw. dem Gautschpunkt aufweisen.Furthermore, it has proven to be advantageous with regard to the crushing of the first fibrous web layer if the control device is designed to set the dry content of the first fibrous web layer to at least 9%, preferably to at least 12%, before the slump. At the same time, it is advantageous to adjust the dry content of the second fibrous web layer to a maximum of 9%, preferably to a maximum of 7%, before the slump. For example, the dry content of the first fibrous web layer can be set to around 12.5% and the dry content of the second fibrous web layer can be set to around 8.5% before the pulp. "Before couching" here means that the fibrous web layers have said dryness values without any significant change even immediately before couching or the couching point.

In einer Weiterbildung der Erfindung wird vorgeschlagen, dass die Regelvorrichtung ausgebildet ist, den Trockengehalt der ersten Faserstoffbahn-Lage und/oder den Trockengehalt der zweiten Faserstoffbahn-Lage vor dem Vergautschen mittels steuerbarer Entwässerungselemente, die auf die erste Faserstoffbahn-Lage bzw. die zweite Faserstoffbahn-Lage vor dem Vergautschen wirken, einzustellen. Die steuerbaren Entwässerungselemente können wenigstens einen Unterdrucksauger umfassen, wobei der am Unterdrucksauger anliegende Unterdruck einstellbar ist.In a further development of the invention, it is proposed that the control device is designed to measure the dry content of the first fibrous web layer and / or the dry content of the second fibrous web layer prior to clogging by means of controllable dewatering elements that are applied to the first fibrous web layer or the second fibrous web -Position before slumping, adjust. The controllable drainage elements can comprise at least one vacuum sucker, the vacuum applied to the vacuum sucker being adjustable.

Ein weiterer Aspekt der vorliegenden Erfindung betrifft zudem eine Maschine zur Herstellung einer mehrlagigen Kartonbahn, umfassend eine zuvor beschriebene, erfindungsgemäße Formierpartie.Another aspect of the present invention also relates to a machine for producing a multilayer cardboard web, comprising a previously described forming section according to the invention.

Ein noch weiterer Aspekt der vorliegenden Erfindung betrifft zudem ein Verfahren zur Herstellung einer mehrlagigen Faserstoffbahn, insbesondere einer mehrlagigen Kartonbahn, umfassend die folgenden Schritte: Bildung einer ersten Faserstoffbahn-Lage mittels wenigstens eines ersten Stoffauflaufs auf einem dem ersten Stoffauflauf zugeordneten ersten endlos umlaufenden Formiersieb, Bildung einer zweiten Faserstoffbahn-Lage mittels wenigstens eines zweiten Stoffauflaufs auf einem dem zweiten Stoffauflauf zugeordneten zweiten endlos umlaufenden Formiersieb, sowie Vergautschen der ersten Faserstoffbahn-Lage mit der zweiten Faserstoffbahn-Lage, wobei das Verfahren ferner die folgenden Schritte umfasst: Messen des Trockengehalts der ersten Faserstoffbahn-Lage vor dem Vergautschen, Messen des Trockengehalts der zweiten Faserstoffbahn-Lage vor dem Vergautschen, und Einstellung des Trockengehalts der ersten Faserstoffbahn-Lage und/oder des Trockengehalt der zweiten Faserstoffbahn-Lage vor dem Vergautschen, basierend auf den Messwerten des Trockengehalts der ersten Faserstoffbahn-Lage und des Trockengehalts der zweiten Faserstoffbahn-Lage. Neben den Messwerten des Trockengehalts der ersten Faserstoffbahn-Lage und des Trockengehalts der zweiten Faserstoffbahn-Lage können auch noch weitere Daten, insbesondere eines übergeordneten Prozessleitsystems, bei dem Einstellen des Trockengehalts der ersten Faserstoffbahn-Lage und/oder des Trockengehalt der zweiten Faserstoffbahn-Lage vor dem Vergautschen Berücksichtigung finden.Yet another aspect of the present invention also relates to a method for producing a multi-ply fibrous web, in particular a multi-ply cardboard web, comprising the following steps: Forming a first fibrous web layer by means of at least one first headbox on a first continuously rotating forming wire assigned to the first headbox, formation a second fibrous web layer by means of at least one second headbox on a second endlessly revolving forming wire assigned to the second headbox, as well as compressing the first fibrous web layer with the second fibrous web layer, the method further comprising the following steps: measuring the dry matter content of the first fibrous web -Layer before couching, measuring the dry content of the second fibrous web layer before couching, and setting the dry content of the first fibrous web layer and / or the dry content of the second fibrous web layer before carving based on the measured values of the dry content of the first fibrous web layer and the dry content of the second fibrous web layer. In addition to the measured values of the dry content of the first fibrous web layer and the dry content of the second fibrous web layer, further data, in particular from a higher-level process control system, can also be used when setting the dry content of the first Find fibrous web layer and / or the dry content of the second fibrous web layer before the gauze into account.

Die zuvor beschriebenen Vorteile und Wirkungen der erfindungsgemäßen Vorrichtung treffen sinngemäß auch auf das erfindungsgemäße Verfahren zu und umgekehrt.The advantages and effects of the device according to the invention described above also apply analogously to the method according to the invention and vice versa.

Insofern wird vorgeschlagen, dass der Trockengehalt der ersten Faserstoffbahn-Lage und/oder der Trockengehalt der zweiten Faserstoffbahn-Lage vor dem Vergautschen derart eingestellt wird, dass der Trockengehalt der ersten Faserstoffbahn-Lage zwischen 2% und 5%, vorzugsweise ungefähr 4%, höher ist als der Trockengehalt der zweiten Faserstoffbahn-Lage.In this respect, it is proposed that the dry content of the first fibrous web layer and / or the dry content of the second fibrous web layer is adjusted before the slump so that the dry content of the first fibrous web layer is between 2% and 5%, preferably approximately 4%, higher is than the dry matter content of the second fibrous web layer.

Zusätzlich oder alternativ wird im Hinblick auf das erfindungsgemäße Verfahren vorgeschlagen, dass der Trockengehalt der ersten Faserstoffbahn-Lage auf wenigstens 9%, vorzugsweise wenigstens 12%, und zugleich den Trockengehalt der zweiten Faserstoffbahn-Lage auf höchstens 9%, vorzugsweise höchstens 7%, vor dem Vergautschen eingestellt wird.Additionally or alternatively, with regard to the method according to the invention, it is proposed that the dry content of the first fibrous web layer should be at least 9%, preferably at least 12%, and at the same time the dry content of the second fibrous web layer should be at most 9%, preferably at most 7% ceases to be lost.

Die Erfindung wird nachfolgend anhand einer schematischen und nicht maßstabsgetreuen Zeichnung weiter erläutert. Es zeigt:

Figur 2
eine Ausführungsform der vorliegenden Erfindung mit einer Regelvorrichtung für den Trockengehalt der ersten Faserstoffbahn-Lage und der zweiten Faserstoffbahn-Lage vor dem Vergautschen.
The invention is explained further below with the aid of a schematic drawing that is not true to scale. It shows:
Figure 2
an embodiment of the present invention with a regulating device for the dry content of the first fibrous web layer and the second fibrous web layer before the couching.

Figur 2 zeigt eine nicht maßstabsgetreue, schematische Darstellung einer Ausführungsform der vorliegenden Erfindung betreffend eine Formierpartie 10 für eine Maschine zur Herstellung einer mehrlagigen Faserstoffbahn, insbesondere einer zweilagigen Kartonbahn. Es sei angemerkt, dass im Folgenden funktionsgleiche Bauteile oder Bauteilabschnitte wie bei dem eingangs zum Stand der Technik beschriebenen Beispiel mit den gleichen Bezugszeichen versehen sind, jedoch ohne einen Strich. Insofern wird auf die obige Beschreibung dieser Bauteile bzw. Bauteilabschnitte verwiesen und im Folgenden nur auf die Unterschiede näher eingegangen. Figure 2 shows a schematic representation, not true to scale, of an embodiment of the present invention relating to a forming section 10 for a machine for producing a multi-ply fibrous web, in particular a two-ply cardboard web. It should be noted that in the following, functionally identical components or component sections as in the example described at the beginning of the prior art are provided with the same reference numerals, but without a prime. In this respect, reference is made to the above description of these components or Component sections are referenced and only the differences are discussed in more detail below.

Die in Figur 2 gezeigte erfindungsgemäße Ausführungsform unterscheidet sich darin von der aus dem Stand der Technik bekannten und in Figur 1 gezeigten Ausführungsform, als dass sie eine Regelvorrichtung 32 umfasst, welche mit einer ersten Sensorvorrichtung 34, einer zweiten Sensorvorrichtung 36, einem ersten steuerbaren Unterdrucksauger 38 und einem zweiten steuerbaren Unterdrucksauger 40 kommuniziert, wie dies durch strichpunktierte Linien in Figur 2 angedeutet ist. Die erste Sensorvorrichtung 34 misst dabei den Trockengehalt der ersten Faserstoffbahn-Lage L1 kurz vor dem Gautschpunkt GP, in dem die erste Faserstoffbahn-Lage L1 mit der zweiten Faserstoffbahn-Lage L2 vergautscht wird, und übermittelt den Messwert an die Regelvorrichtung 32. Genauso misst die zweite Sensorvorrichtung 36 den Trockengehalt der zweiten Faserstoffbahn-Lage L2 kurz vor dem Gautschpunkt GP und übermittelt den Messwert an die Regelvorrichtung 32. Die Regelvorrichtung 32 bestimmt daraufhin eine prozentuale Ist-Differenz zwischen dem ihr übermittelten Messwert des Trockengehalts der ersten Faserstoffbahn-Lage L1 und dem ihr übermittelten zweiten Messwert des Trockengehalts der zweiten Faserstoffbahn-Lage L2. Anschließend vergleicht die Regelvorrichtung 32 die prozentuale Ist-Differenz mit einer ihr vorgegebenen prozentualen Soll-Differenz. Die prozentuale Soll-Differenz kann beispielsweise 4% betragen, d.h. der Trockengehalt der ersten Faserstoffbahn-Lage L1 soll 4% höher sein als der Trockengehalt der zweiten Faserstoffbahn-Lage L2. Über- oder unterschreitet die prozentuale Ist-Differenz um den Absolutbetrag eines Toleranz-Schwellenwerts die prozentuale Soll-Differenz, so steuert die Regelvorrichtung 32 wenigstens einen der beiden steuerbaren Unterdrucksauger 38, 40 derart an, dass der Unterdruck in dem wenigstens einen Unterdrucksaugern 38 so erhöht oder erniedrigt, dass sich die prozentuale Ist-Differenz der prozentualen Soll-Differenz wieder annähert. Durch laufende Messungen und durch laufenden Vergleich kann so die Ist-Differenz im Wesentlich auf den vorgegebenen Wert der Soll-Differenz gehalten werden. Die Regelvorrichtung 32 kann mit einem hier nicht dargestellten übergeordneten Leitsystem verbunden sein, welches die genauen Grenzwerte und/oder die prozentuale Soll-Differenz der Regelvorrichtung 32 vorgibt. Zusätzlich kann die Regelvorrichtung 32 die beiden steuerbaren Unterdrucksauger 38, 40 auch derart ansteuern, dass die Regelvorrichtung 32 sicherstellt, dass der Trockengehalt der ersten Faserstoffbahn-Lage L1 einen gewissen ersten Grenzwert nicht unterschreitet, wohingegen der Trockengehalt der zweiten Faserstoffbahn-Lage L2 einen gewissen zweiten Grenzwert nicht unterschreitet. Der erste Grenzwert kann zum Beispiel 9% und der zweite Grenzwert 7% betragen.In the Figure 2 The embodiment according to the invention shown differs in this from that known from the prior art and in FIG Figure 1 embodiment shown, as that it comprises a control device 32 which communicates with a first sensor device 34, a second sensor device 36, a first controllable vacuum sucker 38 and a second controllable vacuum sucker 40, as indicated by dash-dotted lines in Figure 2 is indicated. The first sensor device 34 measures the dry content of the first fibrous web layer L1 shortly before the couch point GP, in which the first fibrous web layer L1 is slumped with the second fibrous web layer L2, and transmits the measured value to the control device 32 second sensor device 36 the dry content of the second fibrous web layer L2 shortly before the couch point GP and transmits the measured value to the control device 32. The control device 32 then determines an actual percentage difference between the measured value transmitted to it of the dry content of the first fibrous web layer L1 and the her transmitted second measured value of the dry content of the second fibrous web layer L2. The control device 32 then compares the actual percentage difference with a predetermined percentage target difference. The percentage setpoint difference can be, for example, 4%, ie the dry content of the first fibrous web layer L1 should be 4% higher than the dry content of the second fibrous web layer L2. If the percentage actual difference exceeds or falls below the percentage target difference by the absolute amount of a tolerance threshold value, the control device 32 controls at least one of the two controllable vacuum suction devices 38, 40 in such a way that the negative pressure in the at least one vacuum suction device 38 increases or decreased so that the actual percentage difference approaches the target percentage difference again. The actual difference can thus essentially be kept at the specified value of the target difference through ongoing measurements and through ongoing comparisons. The control device 32 can be connected to a higher-level control system, not shown here, which specifies the precise limit values and / or the percentage setpoint difference of the control device 32. In addition, the regulating device 32 can also control the two controllable vacuum suction devices 38, 40 in such a way that the regulating device 32 ensures that the dry content of the first fibrous web layer L1 does not fall below a certain first limit value, whereas the dryness of the second fibrous web layer L2 does not fall below a certain second Limit value not fallen below. The first limit value can be 9% and the second limit value 7%, for example.

Durch die erfindungsgemäße Formierpartie bzw. das erfindungsgemäße Verfahren kann sichergestellt werden, dass stets eine gute Lagenfestigkeit am fertigen Produkt gegeben ist und keine Bahnverdrückung eintritt.The forming section according to the invention or the method according to the invention can ensure that there is always good layer strength on the finished product and that no web compression occurs.

Es sei abschließend angemerkt, dass die Formierpartie 10 auch anders als in Figur 2 darstellt ausgebildet sein kann. Beispielweise können dem ersten Formiersieb 14 und/oder dem zweiten Formiersieb 24 noch ein jeweiliges Obersieb zugeordnet sein, um die Entwässerung der ersten Faserstoffbahn-Lage L1 und/oder zweiten Faserstoffbahn-Lage L2 noch effizienter zu erreichen.Finally, it should be noted that the forming section 10 also differs from that in FIG Figure 2 represents can be formed. For example, the first forming wire 14 and / or the second forming wire 24 can also be assigned a respective upper wire in order to achieve the dewatering of the first fibrous web layer L1 and / or second fibrous web layer L2 even more efficiently.

Bezugszeichenliste: List of reference symbols :

10', 1010 ', 10
Form ierpartieForm ierpartie
12', 1212 ', 12
erster Stoffauflauffirst headbox
14', 1414 ', 14
erstes Formiersiebfirst forming fabric
16', 1616 ', 16
FormierleistenForming bars
18', 1818 ', 18
VakuumsaugkästenVacuum suction boxes
22', 2222 ', 22
zweiter Stoffauflaufsecond headbox
24', 2424 ', 24
zweites Formiersiebsecond forming fabric
26', 2626 ', 26
FormierleistenForming bars
28', 2828 ', 28
VakuumsaugkästenVacuum suction boxes
30', 3030 ', 30
GautschwalzeCouch roll
3232
RegelvorrichtungControl device
3434
erste Sensorvorrichtungfirst sensor device
3636
zweite Sensorvorrichtungsecond sensor device
3838
erster steuerbarer Unterdrucksaugerfirst controllable vacuum suction device
4040
zweiter steuerbarer Unterdrucksaugersecond controllable vacuum suction device
FBFB
FaserstoffbahnFibrous web
GPGP
GautschpunktCouch point
L1L1
erste Faserstoffbahn-Lagefirst fibrous web layer
L2L2
zweite Faserstoffbahn-Lagesecond fibrous web layer

Claims (10)

  1. Forming section (10) for a machine for producing a multi-ply fibrous web (FB), in particular a multi-ply board web, comprising:
    - at least one first headbox (12) and a first endlessly circulating forming fabric (14) assigned to the first headbox (12) for forming a first fibrous web ply (L1),
    - a second headbox (22) and a second endlessly circulating forming fabric (24) assigned to the second headbox (22) for forming a second fibrous web ply (L2), and
    - a couching device (30) for couching the first fibrous web ply (L1) with the second fibrous web ply (L2),
    - a first sensor device (34), which is designed to measure the dryness of the first fibrous web ply (L1) before the couching, and
    - a second sensor device (36), which is designed to measure the dryness of the second fibrous web ply (L2) before the couching,
    characterized in that the forming section (10) also comprises:
    - a control device (32), which is designed to receive the measured values from the first sensor device (34) and the second sensor device (36) and, on the basis of the received measured values, to adjust the dryness of the first fibrous web ply (L1) and/or the dryness of the second fibrous web ply (L2) before the couching.
  2. Forming section (10) according to Claim 1, characterized in that the control device (32) is designed to determine a percentage actual difference between the measured values of the dryness of the first fibrous web ply (L1) and the dryness of the second fibrous web ply (L2), to compare the percentage actual difference with a percentage target difference and to adjust the dryness of the first fibrous web ply (L1) and/or the dryness of the second fibrous web ply (L2) before the couching on the basis of the deviation between the percentage target difference and percentage actual difference.
  3. Forming section (10) according to Claim 1 or 2, characterized in that the control device (32) is designed to adjust the dryness of the first fibrous web ply (L1) and/or the dryness of the second fibrous web ply (L2) before the couching, in such a way that the dryness of the first fibrous web ply (L1) is between 2% and 5%, preferably approximately 4%, higher than the dryness of the second fibrous web ply (L2).
  4. Forming section (10) according to one of the preceding claims, characterized in that the control device (32) is designed to adjust the dryness of the first fibrous web ply (L1) to at least 9%, preferably to at least 12%, and at the same time to adjust the dryness of the second fibrous web ply (L2) to at most 9%, preferably to at most 7%, before the couching.
  5. Forming section (10) according to one of the preceding claims, characterized in that the control device (32) is designed to adjust the dryness of the first fibrous web ply (L1) and/or the dryness of the second fibrous web ply (L2) before the couching by means of controllable dewatering elements (38, 40) which act on the first fibrous web ply (L1) and the second fibrous web ply (L2) before the couching.
  6. Forming section (10) according to Claim 5, characterized in that the controllable dewatering elements (38, 14) comprise at least one vacuum suction device (38, 40), wherein the vacuum applied to the vacuum suction device (38, 40) is adjustable.
  7. Machine for producing a multi-ply board web, comprising a forming section (10) according to one of the preceding claims.
  8. Method for producing a multi-ply fibrous web (FB), in particular a multi-ply board web, comprising the following steps:
    - forming a first fibrous web ply (L1) by means of at least one first headbox (12) on a first endlessly circulating forming fabric (14) assigned to the first headbox (12),
    - forming a second fibrous web ply (L2) by means of at least one second headbox (22) on a second endlessly circulating forming fabric (24) assigned to the second headbox (22), and
    - couching the first fibrous web ply (L1) with the second fibrous web ply (L2),
    measuring the dryness of the first fibrous web ply (L1) before the couching, and
    measuring the dryness of the second fibrous web ply (L2) before the couching,
    characterized in that the method also comprises the following step:
    - adjusting the dryness of the first fibrous web ply (L1) and/or the dryness of the second fibrous web ply (L2) before the couching, on the basis of the measured values of the dryness of the first fibrous web ply (L1) and the dryness of the second fibrous web ply (L2).
  9. Method according to Claim 8, characterized in that the dryness of the first fibrous web ply (L1) and/or the dryness of the second fibrous web ply (L2) before the couching is adjusted in such a way that the dryness of the first fibrous web ply (L1) is between 2% and 5%, preferably approximately 4%, higher than the dryness of the second fibrous web ply (L2).
  10. Method according to Claim 8 or 9, characterized in that the dryness of the first fibrous web ply (L1) is adjusted to at least 9%, preferably at least 12%, and at the same time the dryness of the second fibrous web ply (L2) is adjusted to at most 9%, preferably at least 7%, before the couching.
EP20155326.0A 2019-02-11 2020-02-04 Forming section for a machine for producing a multi-ply fibrous web and method of producing a multi-ply fibrous web Active EP3693509B1 (en)

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DE10101549A1 (en) * 2001-01-15 2002-07-18 Voith Paper Patent Gmbh Production of a multi-layer paper/cardboard web, has couching station(s) along the web path where water is extracted and the fine matter is dispersed between layers to give a firm bond between them
DE10312836A1 (en) * 2003-03-21 2004-10-14 Voith Paper Patent Gmbh Papermaking assembly surrenders fibre suspension to moving sieve belt with lines of moisture and optical sensors linked to moisture regulation system
FI20075786L (en) * 2007-11-06 2009-03-16 Metso Paper Inc Measurement procedure and measurement system
DE102008040688A1 (en) * 2008-07-24 2010-01-28 Voith Patent Gmbh Method for optimizing the energy balance in forming units in machines for producing fibrous webs and forming unit

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