EP1052327B1 - White water circuit and process for the circulation of water in a papermachine - Google Patents

White water circuit and process for the circulation of water in a papermachine Download PDF

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Publication number
EP1052327B1
EP1052327B1 EP00108222A EP00108222A EP1052327B1 EP 1052327 B1 EP1052327 B1 EP 1052327B1 EP 00108222 A EP00108222 A EP 00108222A EP 00108222 A EP00108222 A EP 00108222A EP 1052327 B1 EP1052327 B1 EP 1052327B1
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Prior art keywords
white water
filler
pigment
water
application
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EP00108222A
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German (de)
French (fr)
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EP1052327A1 (en
Inventor
Klaus Prechtel
Ingolf Cedra
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Voith Patent GmbH
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Voith Paper Patent GmbH
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22Addition to the formed paper
    • D21H23/24Addition to the formed paper during paper manufacture
    • D21H23/26Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
    • D21H23/28Addition before the dryer section, e.g. at the wet end or press section
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/66Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the invention relates to a white water circuit of a paper machine, which at least one application device for applying a pigment and / or filler Mass on a not yet completely drained fiber web in the wet area has, which also with a first white water cycle, the one Headbox supplied with white water, and a second white water circuit, the forms the rest of the white water cycle the first white water cycle being fed exclusively by drainage elements is in the manufacturing process before the application of the pigment and / or filler Mass are arranged, and being part of the second white water circuit serves to feed the application of the pigment and / or filler-containing mass. Furthermore, the Invention a method for water circulation of a paper machine with a Wet part according to the preamble of claim 4.
  • PCT publication WO 93/23612 A1 discloses one method and one Device for recycling waste water in a paper machine, the Process the splitting of at least part of the wastewater, which runs through a forming fabric during a papermaking process, in comprises at least two separate streams. It is envisaged that the wastewater by pumping directly without flowing through any open vessels, as essentially air-free separate streams to at least two essentially separate points of stock dilution in the fiber process in the short circuit of the paper machine flows.
  • the one in the constant part of this paper machine Assemblies used correspond to those of a known type, such as Sieves, cleaner stages, classifiers and the like.
  • PCT publication WO 91/10500 A1 in turn discloses a method for the recovery of excess application medium, from known Filtration processes, especially static membrane filtration and dynamic Ultrafiltration, use is made.
  • the excess order medium is dewatered without the addition of chemicals and the resultant Application material (pasty solids or the like) becomes one again new order material added.
  • the white water I is part of the White water, which on modern paper machines on a forming roller, a Top suction box, a forming shoe or other suction elements, taking no account of any existing, upstream application is taken from filler or pigment.
  • This white water I is without treatment performed in a short cycle and for the dilution of the thick matter Machine chest used right before the headbox.
  • the amount of water on the wet vacuum cleaners, flat vacuum cleaners and suction screen rollers are typically recorded as white water II.
  • the clear water will then used for spray pipes and the like.
  • the inventors have thus recognized that it is to solve the above Problem is the white water cycle of a paper machine and that Process for water circulation of the paper machine so that the Water cycle, which includes the headbox of the paper machine, is fed exclusively from dewatering units, which the fiber web dewater at a stage where pigment and / or filler-containing mass on the fiber web in the process of formation has been applied.
  • Each drainage element which in the Following the application of the filler or pigments of the web moisture withdrawn, is consequently enriched with high pigment or filler proportions, so that this water leads to a steady increase in the filler content would lead the headbox formed layer.
  • the collection devices of cleaning liquid also count the sieves that are coated with pigment and / or filler Have come into contact because they also have an increased filler or Pigment content are contaminated.
  • the inventors therefore propose a white water cycle a paper machine which has at least one application device for application a mass containing pigment and / or filler on a not yet fully dewatered Has fiber web in the wet area, which continues with a first White water cycle that supplies a headbox with white water, and continues with a second white water circuit that absorbs the rest of the white water, is equipped to further develop that the rest, not to feed the application of the pigment and / or filler Mass serving, white water of the second white water cycle and not that White water supplied to the headbox with a microflotation device to clear filtrate processed and returned to the manufacturing process.
  • This resulting clear filtrate from the second white water cycle can later be used anywhere in the paper web manufacturing process.
  • the presence of a microflotation device is particularly advantageous if the white water of the second white water circuit is provided with a binder, in particular starch, since this binder is then discharged from the white water by the microflotation device and thus an accumulation of binder in the middle fiber layer of the finished paper is avoided can.
  • a microflotation device is present and optionally a disk thickener
  • the part of the white water, which the application of the pigment and / or filler-containing mass supplied is, from the flotate of the microflotation device and / or from the overflow of the disk thickener is removed. This ensures that each the proportion of white water containing pigment and / or filler for application is supplied, which is provided with a higher pigment and / or filler content is and thus to a maximum possible return to pigment or Filler leads.
  • the inventors propose a method for water circulation Paper machine with a wet part, in which an emerging fiber web at least one surface applied a pigment and / or filler-containing mass and white water is removed from the fibrous web that forms, only the white water, which does not contain pigments and / or fillers from the pigment and / or filler application is loaded into the headbox, and only white water, which contains pigments and / or fillers from the Pigment and / or filler application is loaded, the application of the pigment and / or filler-containing mass is supplied in that regard further, that the rest is not to feed the application of the pigment and / or filler Mass serving white water of the second white water cycle and not that White water supplied to the headbox with a removal device, preferably one Microflotation device (7), processed to clear filtrate and returned to the manufacturing process becomes.
  • a removal device preferably one Microflotation device (7)
  • the clear filtrate can be returned at any point on the paper machine. If binders are present in the white water of the second white water circuit, the above statements apply.
  • Another advantageous embodiment of the method provides that the white water, which the application of the pigment and / or filler-containing mass is supplied from the overflow of the microflotation device and / or of the existing disk thickener is removed.
  • This configuration of the procedure has the effect that only the substantial part of the White water is fed into the return line to the application, and thus the amount of the necessary new pigment and / or filler can be reduced.
  • FIG. 1 shows a white water circuit according to the invention of a paper machine in a schematic representation. From the paper machine is essentially the sheet formation section 2 with the upstream headbox 1 and the press section 3 indicated below. The white water rivers are drawn as arrows.
  • the illustration shows a hybrid former, with a headbox 1, its Stock suspension coming from stock preparation 14 onto first screen 10.1 gives up.
  • a first dewatering unit 2.1 is provided, which introduces the collected white water into a white water tank 4.
  • a second sieve 10.2 which from above onto the suspension layer is launched.
  • a further drainage element 2.2 the top of the screen, the removed white water also the white water tank 4 is supplied.
  • a further suction roller 12 is attached again causes dewatering of the fiber web and the removed, with White water loaded with pigment and filler.
  • white water II which consists of the drainage units 2.3, 2.4, 2.5 and 12 is taken, collected and together to a disc thickener 6 passed and thus kept away from the screen circuit of the headbox 1.
  • the disc thickener 6 gives its thin material via line 16 to one Microflotation device 7 and its thick matter via line 15 to one White water tank 5, which also contains the flotate from the microflotation device 7 is conducted via line 17. From this white water tank 5 is the Pigment and filler preparation 8 with high pigment and filler content Water, in which also the necessary amount of fresh pigment and Filler is fed via the feed 8.1.
  • the pigment and filler preparation 8 then gives the finished pigment and Filler slurry on to applicators 11.1 and 11.2, where they focus on the resulting Fiber web is applied.
  • the clear filtrate which is obtained from the microflotation 7, is fed in via the line 18 a clear filtrate container 9 is stored and faces the papermaking process again as clear water to be used at any point.
  • the white water cycle of a paper machine shown above and the method of water circulation in a paper machine achieved that enrichment even when the paper machine is in operation for a long time the inner layer of the paper produced with filler and / or pigment is avoided.

Abstract

The water circuit system, at the fourdrinier section of a papermaking machine, is linked to an applicator where a mass is applied to the wet paper web containing a pigment and/or filling materials. An initial water circuit is fed exclusively by the sections (2.1,2.2) which extract water from the wet web in the web production process, before the wet web is coated with a mass. Part of the extracted water, in a second water circuit, is used to feed the web applicator, and the remainder is cleaned of contained matter pref. in a micro-filtration station (7). A thickening stage (6) is in front of the micro-filtration unit (7). P of the water for the applicator is taken from the overflow at the thickening stage (6) and/or from the micro-filter (7). An Independent claim is included for the operation of a water circuit at the fourdrinier section of a papermaking machine, where only water which is wholly clean of pigments and/or filling materials is returned to the stock inlet (1). Preferred Features: Only water which carries pigments and/or filling materials is passed to the applicator. Unused water, w carries matter, is cleaned by micro-filtration (7) after thickening (6) to give a clear water output.

Description

Die Erfindung betrifft einen Siebwasserkreislauf einer Papiermaschine, welche mindestens eine Auftragsvorrichtung zur Applikation einer pigment- und/oder füllstoffhaltigen Masse auf eine noch nicht fertig entwässerte Faserbahn im Naßbereich aufweist, welche weiterhin mit einem ersten Siebwasserkreislauf, der einen Stoffauflauf mit Siebwasser versorgt, und einem zweiten Siebwasserkreislauf, der den Rest des Siebwasserkreislaufes bildet, ausgestattet ist wobei der erste Siebwasserkreislauf ausschließlich durch Entwässerungselemente gespeist wird, die im Herstellungsprozeß vor der Applikation der pigment- und/oder füllstoffhaltigen Masse angeordnet sind, und wobei ein Teil des zweiten Siebwasserkreislaufes zur Speisunq der Applikation der pigment- und/oder füllstoffhaltigen Masse dient. Weiterhin betrifft die Erfindung ein Verfahren zur Wasserzirkulation einer Papiermaschine mit einem Naßteil gemäß dem Oberbegriff des Anspruchs 4. The invention relates to a white water circuit of a paper machine, which at least one application device for applying a pigment and / or filler Mass on a not yet completely drained fiber web in the wet area has, which also with a first white water cycle, the one Headbox supplied with white water, and a second white water circuit, the forms the rest of the white water cycle the first white water cycle being fed exclusively by drainage elements is in the manufacturing process before the application of the pigment and / or filler Mass are arranged, and being part of the second white water circuit serves to feed the application of the pigment and / or filler-containing mass. Furthermore, the Invention a method for water circulation of a paper machine with a Wet part according to the preamble of claim 4.

Aus der deutschen Offenlegungsschrift DE 34 06 808 A1 (Oberbegriff der Ausprüchen 1und 4 ist ein Verfahren und eine Vorrichtung zur Applikation von Hilfs- oder Veredelungsstoffen sowie Farbstoffen auf einer Papiermaschine bekannt. Dabei ist vorgesehen, dass infolge der Applikation von Lösungen und Suspensionen genannter Stoffe die in denselben enthaltene überschüssige Flüssigkeit auf der Saugerpartie oder einem Abschnitt derselben entzogen und zum größten Teil in einem getrennten Kreislauf rezirkuliert werden.From the German patent application DE 34 06 808 A1 (preamble of claims 1 and 4 is a method and a device for the application of auxiliary or finishing materials and dyes known on a paper machine. It is provided that as a result of Application of solutions and suspensions of the substances mentioned in the same Excess liquid contained on the suction section or a section withdrawn from them and for the most part recirculated in a separate cycle become.

Die PCT-Offenlegungsschrift WO 93/23612 A1 offenbart ein Verfahren und eine Vorrichtung zum Recyclisieren von Abwasser in einer Papiermaschine, wobei das Verfahren das Aufspalten von mindestens einem Teil des Abwassers, welches während eines Papierherstellungsverfahrens durch ein Formgewebe abläuft, in mindestens zwei getrennt Ströme umfasst. Dabei ist vorgesehen, dass das Abwasser durch Pumpen direkt, ohne irgendwelche offene Gefäße zu durchströmen, als im wesentlichen luftfreie separate Ströme zu mindestens zwei im wesentlichen getrennten Punkten der Stammlösungsverdünnung in den Faserprozess in den kurzen Kreislauf der Papiermaschine fließt. Die im Konstantteil dieser Papiermaschine eingesetzten Baugruppen entsprechen denen bekannter Bauart, wie beispielsweise Siebe, Cleanerstufen, Sichter und dergleichen.PCT publication WO 93/23612 A1 discloses one method and one Device for recycling waste water in a paper machine, the Process the splitting of at least part of the wastewater, which runs through a forming fabric during a papermaking process, in comprises at least two separate streams. It is envisaged that the wastewater by pumping directly without flowing through any open vessels, as essentially air-free separate streams to at least two essentially separate points of stock dilution in the fiber process in the short circuit of the paper machine flows. The one in the constant part of this paper machine Assemblies used correspond to those of a known type, such as Sieves, cleaner stages, classifiers and the like.

Die PCT-Offenlegungsschrift WO 91/10500 A1 offenbart wiederum ein Verfahren zur Rückgewinnung von überschüssigem Auftragsmedium, wobei von bekannten Filtrationsverfahren, insbesondere der statischen Membranfiltration und der dynamischen Ultrafiltration, Gebrauch gemacht wird. Das überschüssige Auftragsmedium wird dabei ohne Chemikalienzugabe entwässert und das dabei gewonnene Auftragsmaterial (pastöse Feststoffe oder dergleichen) wird wieder einem neuen Auftragsmaterial zugesetzt.PCT publication WO 91/10500 A1 in turn discloses a method for the recovery of excess application medium, from known Filtration processes, especially static membrane filtration and dynamic Ultrafiltration, use is made. The excess order medium is dewatered without the addition of chemicals and the resultant Application material (pasty solids or the like) becomes one again new order material added.

Aus der Patentschrift US 5,152,872 ist es bekannt, auf eine noch nicht fertig entwässerte Papierbahn ein Pigment- oder Füllstoff aufzutragen, um auf diese Weise ein mehrschichtiges Papier zu erzeugen, dessen äußere Schichten einen, gegenüber der inneren Schicht wesentlich erhöhten Pigmentanteil aufweisen.From US Pat. No. 5,152,872 it is known to use a not yet completely dewatered Paper web to apply a pigment or filler in this way to produce a multilayer paper, the outer layers of which face one of the inner layer have significantly increased pigment content.

Wird eine derartige Technik der Pigmentapplikation oder auch der Füllstoffapplikation auf einer noch nicht fertig entwässerten Papierbahn in einer gängigen Papiermaschine angewandt, so entsteht das Problem, daß nach einer gewissen Laufzeit der Papiermaschine sich eine Anreicherung des Siebkreislaufes, in den der Stoffauflauf eingebunden ist, mit Füllstoff beziehungsweise Pigment ergibt. Als Ergebnis einer solchen Anreicherung wird die zunächst füllstoffarme innere Papierschicht sich mit fortlaufendem Herstellungsprozeß ebenfalls mit Füllstoff oder Pigmenten anreichern und damit der gewünschten Verteilung des Füllstoffes im Papier entgegenlaufen. Als vorteilhafte Füllstoffverteilung im Papier wird nämlich ein Zustand angesehen, in dem sich der Füllstoff oder die Pigmente im wesentlichen in den Außenschichten des Papieres befinden, während die innere Schicht hauptsächlich mit Faseranteilen beschickt wird, um eine hohe Reißfestigkeit zu erreichen. Hauptvorteil einer solchen steilen Füllstoffverteilung im Papier ist die Einebnung der für den Druckprozeß entscheidenden Oberflächenstruktur und die Homogenisierung dieser.Such a technique of pigment application or filler application on a not yet completely dewatered paper web in a common paper machine applied, the problem arises that after a certain Runtime of the paper machine is an enrichment of the sieve cycle in the the headbox is integrated with filler or pigment. As The result of such an enrichment is the inner paper layer, which is initially low in filler with ongoing production process also with filler or Enrich pigments and thus the desired distribution of the filler in the Run towards paper. As an advantageous filler distribution in the paper is namely considered a state in which the filler or the pigments are essentially reside in the outer layers of the paper, while the inner layer is mainly loaded with fiber components in order to achieve a high tear resistance to reach. The main advantage of such a steep filler distribution in paper is that Flattening the surface structure, which is decisive for the printing process, and the Homogenization of this.

Es ist daher Aufgabe der Erfindung, einen Siebwasserkreislauf einer Papiermaschine und ein Verfahren zur Wasserzirkulation einer Papiermaschine vorzustellen, welche verhindern, daß auch bei längerem Betrieb der Papiermaschine eine Anreicherung der inneren Schicht des hergestellten Papieres mit Füllstoff und/oder Pigment stattfindet.It is therefore an object of the invention, a white water circuit of a paper machine and to present a method for water circulation of a paper machine, which prevent that even with prolonged operation of the paper machine an enrichment of the inner layer of the paper produced with filler and / or pigment takes place.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale der beiden unabhängigen Ansprüche 1 und 4 gelöst.According to the invention, this object is achieved through the features of the two independent Claims 1 and 4 solved.

Beim Papierherstellungsprozeß werden die Wassermengen, die im Siebbereich der Papiermaschine entfernt werden, in Form von zwei Fraktionen - Siebwasser I und Siebwasser II - getrennt erfaßt. Das Siebwasser I ist hierbei der Teil des Siebwassers, der an modernen Papiermaschinen an einer Formierwalze, einem Obersiebsaugkasten, einem Formierschuh oder anderer Saugelemente anfällt, wobei keine Rücksicht auf eine eventuelle vorhandene, vorgeschaltete Applikation von Füllstoff oder Pigment genommen wird. Dieses Siebwasser I wird ohne Behandlung im kurzen Kreislauf geführt und zur Verdünnung des Dickstoffes der Maschinenbütte direkt vor dem Stoffauflauf verwendet. In the papermaking process, the amount of water in the screen area removed from the paper machine in the form of two fractions - white water I and white water II - recorded separately. The white water I is part of the White water, which on modern paper machines on a forming roller, a Top suction box, a forming shoe or other suction elements, taking no account of any existing, upstream application is taken from filler or pigment. This white water I is without treatment performed in a short cycle and for the dilution of the thick matter Machine chest used right before the headbox.

Die Wassermengen, die an den Naßsaugern, Flachsaugern und Saugsiebwalzen anfallen, werden typischer Weise als Siebwasser II erfaßt. Das Klarwasser wird dann für Spritzrohre und dergleichen verwendet.The amount of water on the wet vacuum cleaners, flat vacuum cleaners and suction screen rollers are typically recorded as white water II. The clear water will then used for spray pipes and the like.

Bei der Applikation von Füllstoff oder Pigment im Siebbereich einer Papiermaschine wird durch die nachfolgenden Vakuumsauger wieder ein Teil des aufgetragenen Füllstoffes oder Pigmentes mit dem Wasser entfernt. Bei Wiederverwendung dieses Wassers ohne Zwischenbehandlung kommt es zur Füllstoffanreicherung des Dünnstoffes, der initial durch den Stoffauflauf querverteilt und über Formierwalze sowie Siebsaugkasten entwässert wird. Eine Einstellung einer sehr steilen Füllstoff-Verteilung in Z-Richtung des Papieres ist nicht möglich.When applying filler or pigment in the screen area of a paper machine a part of the applied is again by the subsequent vacuum suction Filler or pigment removed with the water. When reused This water without intermediate treatment leads to an accumulation of filler of the thin material that is initially distributed through the headbox and over Forming roller and screen suction box is dewatered. An attitude of a very steep filler distribution in the Z direction of the paper is not possible.

Die Erfinder haben also erkannt, daß es zur Lösung des oben geschilderten Problems notwendig ist, den Siebwasserkreislauf einer Papiermaschine und das Verfahren zur Wasserzirkulation der Papiermaschine so auszugestalten, daß der Wasserkreislauf, in den der Stoffauflauf der Papiermaschine eingeschlossen ist, ausschließlich aus Entwässerungsaggregaten beschickt wird, welche die Faserbahn in einem Stadium entwässern, in dem noch kein Auftrag einer pigmentund/oder füllstoffhaltigen Masse auf die Im Entstehungsprozeß befindliche Faserbahn aufgetragen worden ist. Jedes Entwässerungselement, welches im Anschluß an den Auftrag des Füllstoffes oder der Pigmente der Bahn Feuchtigkeit entzieht, ist folgerichtig mit hohen Pigment- oder Füllstoffanteilen angereichert, so daß dieses Wasser zu einer stetigen Erhöhung des Füllstoffgehaltes der durch den Stoffauflauf gebildeten Schicht führen würde. Von den Aggregaten, welche als Lieferanten für das Siebwasser, welches zum Stoffauflauf zurückgeführt wird, unerwünscht sind, zählt naturgemäß auch die Auffangvorrichtungen von Reinigungsflüssigkeit der Siebe, die mit dem Pigment- und/oder Füllstoffauftrag In Kontakt gekommen sind, da diese ebenso mit einem erhöhten Füllstoff- beziehungsweise Pigmentgehalt belastet sind. The inventors have thus recognized that it is to solve the above Problem is the white water cycle of a paper machine and that Process for water circulation of the paper machine so that the Water cycle, which includes the headbox of the paper machine, is fed exclusively from dewatering units, which the fiber web dewater at a stage where pigment and / or filler-containing mass on the fiber web in the process of formation has been applied. Each drainage element, which in the Following the application of the filler or pigments of the web moisture withdrawn, is consequently enriched with high pigment or filler proportions, so that this water leads to a steady increase in the filler content would lead the headbox formed layer. From the aggregates, which as a supplier for the white water, which is returned to the headbox, are naturally undesirable, the collection devices of cleaning liquid also count the sieves that are coated with pigment and / or filler Have come into contact because they also have an increased filler or Pigment content are contaminated.

Die Erfinder schlagen daher erfindungsgemäß vor, einen Siebwasserkreislauf einer Papiermaschine, welche mindestens eine Auftragsvorrichtung zur Applikation einer pigment- und/oder füllstoffhaltigen Masse auf eine noch nicht fertig entwässerte Faserbahn im Naßbereich aufweist, welche weiterhin mit einem ersten Siebwasserkreislauf, der einen Stoffauflauf mit Siebwasser versorgt, und weiterhin mit einem zweiten Siebwasserkreislauf, der den Rest des Siebwassers aufnimmt, ausgestattet ist, dahingehend weiterzuentwickeln, dass das restliche, nicht zur Speisung der Applikation der pigment- und/oder füllstoffhaltigen Masse dienende, Siebwasser des zweiten Siebwasserkreislaufes und das nicht dem Stoffauflauf zugeführte Siebwasser mit einer Mikroflotationsvorrichtung zu Klarfiltrat verarbeitet und in den Herstellungsprozeß zurückgeführt wird. According to the invention, the inventors therefore propose a white water cycle a paper machine which has at least one application device for application a mass containing pigment and / or filler on a not yet fully dewatered Has fiber web in the wet area, which continues with a first White water cycle that supplies a headbox with white water, and continues with a second white water circuit that absorbs the rest of the white water, is equipped to further develop that the rest, not to feed the application of the pigment and / or filler Mass serving, white water of the second white water cycle and not that White water supplied to the headbox with a microflotation device to clear filtrate processed and returned to the manufacturing process.

Dieses so entstandene Klarfiltrat aus dem zweiten Siebwasserkreislauf kann später im Herstellungsprozeß der Papierbahn an beliebiger Stelle verwendet werden.
Das Vorhandensein einer Mikroflotationsvorrichtung ist insbesondere dann vorteilhaft, wenn das Siebwasser des zweiten Siebwasserkreislaufes mit Bindemittel, insbesondere Stärke, versehen ist, da dieses Bindemittel dann durch die Mikroflotationsvorrichtung aus dem Siebwasser ausgetragen und somit eine Anreicherung von Bindemittel in der mittleren Faserschicht des fertigen Papieres vermieden werden kann.
This resulting clear filtrate from the second white water cycle can later be used anywhere in the paper web manufacturing process.
The presence of a microflotation device is particularly advantageous if the white water of the second white water circuit is provided with a binder, in particular starch, since this binder is then discharged from the white water by the microflotation device and thus an accumulation of binder in the middle fiber layer of the finished paper is avoided can.

Weiterhin ist es vorteilhaft, vor einer Mikroflotationsvorrichtung einen Scheibeneindicker vorzuschalten, da hierdurch schon ein wesentlicher Anteil der Feststoffe aus dem Siebwasser entnommen wird und dadurch die benötigte Filterfläche der Mikroflotationsvorrichtung bei gleicher Wasserdurchlaufmenge reduziert und Kosten gespart werden kann.It is also advantageous to have a disk thickener in front of a microflotation device upstream, as this already means a substantial proportion of the solids is taken from the white water and thereby the required filter area of the Microflotation device with the same water flow rate reduced and Costs can be saved.

Vorteilhaft ist es außerdem, wenn beim Vorhandensein einer Mikroflotationsvorrichtung und gegebenenfalls einem Scheibeneindicker der Teil des Siebwassers, welcher der Applikation der pigment- und/oder füllstoffhaltigen Masse zugeführt wird, aus dem Flotat der Mikroflotationsvorrichtung und/oder aus dem Überlauf des Scheibeneindickers entnommen wird. Hierdurch wird sichergestellt, daß jeweils der Anteil des pigment- und/oder füllstoffhaltigen Siebwassers zur Applikation zugeführt wird, der mit einem höheren Pigment- und/oder Füllstoffgehalt versehen ist und damit zu einer maximal möglichen Rückführung an Pigment- beziehungsweise Füllstoff führt.It is also advantageous if a microflotation device is present and optionally a disk thickener, the part of the white water, which the application of the pigment and / or filler-containing mass supplied is, from the flotate of the microflotation device and / or from the overflow of the disk thickener is removed. This ensures that each the proportion of white water containing pigment and / or filler for application is supplied, which is provided with a higher pigment and / or filler content is and thus to a maximum possible return to pigment or Filler leads.

Weiterhin schlagen die Erfinder vor, ein Verfahren zur Wasserzirkulation einer Papiermaschine mit einem Naßteil, in welchem einer entstehenden Faserbahn auf mindestens eine Oberfläche eine pigment- und/oder füllstoffhaltige Masse appliziert und der sich bildenden Faserbahn Siebwasser entzogen wird, wobei ausschließlich das Siebwasser, welches nicht mit Pigmenten und/oder Füllstoffen aus der Pigment- und/oder Füllstoffapplikation belastet ist, dem Stoffauflauf zugeführt wird, und wobei ausschließlich Siebwasser, welches mit Pigmenten und/oder Füllstoffen aus der Pigment- und/oder Füllstoffapplikation belastet ist, der Applikation der pigment- und/oder füllstoffhaltigen Masse zugeführt wird, dahingehend weiterzuentwickeln, dass das restliche nicht zur Speisung der Applikation der pigment- und/oder füllstoffhaltigen Masse dienende Siebwasser des zweiten Siebwasserkreislaufes und das nicht dem Stoffauflauf zugeführte Siebwasser mit einer Entstoffungsvorrichtung, vorzugsweise einer Mikroflotationsvorrichtung (7), zu Klarfiltrat verarbeitet und in den Herstellungsprozeß zurückgeführt wird.Furthermore, the inventors propose a method for water circulation Paper machine with a wet part, in which an emerging fiber web at least one surface applied a pigment and / or filler-containing mass and white water is removed from the fibrous web that forms, only the white water, which does not contain pigments and / or fillers from the pigment and / or filler application is loaded into the headbox, and only white water, which contains pigments and / or fillers from the Pigment and / or filler application is loaded, the application of the pigment and / or filler-containing mass is supplied in that regard further, that the rest is not to feed the application of the pigment and / or filler Mass serving white water of the second white water cycle and not that White water supplied to the headbox with a removal device, preferably one Microflotation device (7), processed to clear filtrate and returned to the manufacturing process becomes.

Die Zurückführung des Klarfiltrats kann an einer beliebigen Stelle der Papiermaschine erfolgen.
Bei Vorhandensein von Bindemittel im Siebwasser des zweiten Siebwasserkreislaufes gelten die obigen Ausführungen.
The clear filtrate can be returned at any point on the paper machine.
If binders are present in the white water of the second white water circuit, the above statements apply.

Vorteilhaft ist es ebenfalls, das Verfahren derart auszugestalten, daß vor einer Mikroflotationsvorrichtung eine Vorreinigung durch einen Scheibeneindicker stattfindet. Hierdurch wird eine Verringerung der notwendigen Filterfläche in der Mikroftotationsvorrichtung und damit eine Kostenreduktion des Verfahrens erreicht.It is also advantageous to design the method in such a way that before Microflotation device is pre-cleaned by a disc thickener. This will reduce the necessary filter area in the Micro-rotation device and thus a cost reduction of the method achieved.

Eine weitere vorteilhafte Ausgestaltung des Verfahrens sieht vor, daß das Siebwasser, welches der Applikation der pigment- und/oder füllstoffhaltigen Masse zugeführt wird, aus dem Überlauf der Mikroflotationsvorrichtung und/oder des gegebenenfalls vorhandenen Scheibeneindickers entnommen wird. Diese Ausgestaltung des Verfahrens bewirkt, daß ausschließlich der gehaltvolle Anteil des Siebwassers in den Rücklauf zur Applikation geführt wird, und damit die Menge des notwendigen neuen Pigments und/oder Füllstoffs reduziert werden kann.Another advantageous embodiment of the method provides that the white water, which the application of the pigment and / or filler-containing mass is supplied from the overflow of the microflotation device and / or of the existing disk thickener is removed. This configuration of the procedure has the effect that only the substantial part of the White water is fed into the return line to the application, and thus the amount of the necessary new pigment and / or filler can be reduced.

Zusätzliche Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels unter Bezugnahme auf die Zeichnung.Additional features and advantages of the invention will appear from the following Description of a preferred embodiment with reference on the drawing.

Die einzige Figur 1 zeigt einen erfindungsgemäßen Siebwasserkreislauf einer Papiermaschine in schematischer Darstellung. Von der Papiermaschine ist im wesentlichen die Blattbildungssektion 2 mit dem vorgeschalteten Stoffauflauf 1 und der nachfolgend angedeuteten Pressensektion 3 dargestellt. Die Siebwasserflüsse sind als Pfeile gezeichnet. The only FIG. 1 shows a white water circuit according to the invention of a paper machine in a schematic representation. From the paper machine is essentially the sheet formation section 2 with the upstream headbox 1 and the press section 3 indicated below. The white water rivers are drawn as arrows.

Die Darstellung zeigt einen Hybridformer, mit einem Stoffauflauf 1, der seine Stoffsuspension von einer Stoffaufbereitung 14 kommend auf das erste Sieb 10.1 aufgibt. Direkt anschließend ist eine erste Entwässerungseinheit 2.1 vorgesehen, die das gesammelte Siebwasser in einen Siebwasserbehälter 4 einleitet. Anschließend folgt ein zweites Sieb 10.2, welches von oben auf die Suspensionsschicht aufgelegt wird. Danach folgt ein weiteres Entwässerungselement 2.2 auf der Sieboberseite, dessen entnommenes Siebwasser ebenfalls dem Siebwasserbehälter 4 zugeführt wird. Diese beiden Entwässerungseinheiten 2.1 und 2.2, die beide vor einer nachfolgenden Applikation von Pigment- und Füllstoff angeordnet, erzeugen das Siebwasser I und dienen ausschließlich dem Siebwasserkreislauf, in den der Stoffauflauf 1 eingeschlossen ist.The illustration shows a hybrid former, with a headbox 1, its Stock suspension coming from stock preparation 14 onto first screen 10.1 gives up. Immediately afterwards, a first dewatering unit 2.1 is provided, which introduces the collected white water into a white water tank 4. Subsequently follows a second sieve 10.2, which from above onto the suspension layer is launched. This is followed by a further drainage element 2.2 the top of the screen, the removed white water also the white water tank 4 is supplied. These two drainage units 2.1 and 2.2, the both arranged before a subsequent application of pigment and filler, generate the white water I and serve exclusively the white water cycle, in which the headbox 1 is enclosed.

Anschließend an das Entwässerungselement 2.2 folgt eine Applikation von Pigment- und Füllstoff durch das zweite Sieb 10.2 auf die inzwischen gebildete Faserbahn. Direkt hinter dem ersten Applikator 11.1 ist auf der gegenüberliegenden Seite des Siebes ein weiteres Entwässerungselement 2.3 angebracht. Anschließend folgt eine Siebsaugwalze 2.5, die ebenfalls als Entwässerungselement dient und in deren siebberührtem Umfang ein zweiter Applikator 11.2 angeordnet ist, der nun Pigment- und Füllstoff auf die andere Seite der Faserbahn aufgibt. Die von den Sieben 10.1 und 10.2 sandwich-artig eingeschlossene Faserbahn wird danach über eine Umlenkrolle zu einem weiteren Entwässerungselement 2.4 geführt, nachdem sich das obere Sieb 10.2 von der Faserbahn gelöst und diese zur Pressensektion 3 geführt wird.Following the drainage element 2.2 is an application of pigment and filler through the second sieve 10.2 onto the now formed fiber web. Directly behind the first applicator 11.1 is on the opposite Side of the sieve another drainage element 2.3 attached. Subsequently follows a screen suction roller 2.5, which is also used as a drainage element is used and a second applicator 11.2 is arranged in the area touched by the sieve is now the pigment and filler on the other side of the fiber web. The of the sieves 10.1 and 10.2 sandwiched fiber web is then led to a further drainage element 2.4 via a deflection roller, after the upper sieve 10.2 detached from the fibrous web and this to Press section 3 is performed.

Zu Beginn der Pressensektion 3 ist eine weitere Saugwalze 12 angebracht, die nochmals eine Entwässerung der Faserbahn bewirkt und das entnommene, mit Pigment- und Füllstoff beladene Siebwasser ableitet. Erfindungsgemäß wird das so entstandene Siebwasser II, welches aus den Entwässerungseinheiten 2.3, 2.4, 2.5 und 12 entnommen wird, gesammelt und gemeinsam zu einem Scheibeneindicker 6 geleitet und somit vom Siebkreislauf des Stoffauflaufes 1 ferngehalten.At the beginning of the press section 3, a further suction roller 12 is attached again causes dewatering of the fiber web and the removed, with White water loaded with pigment and filler. According to the invention thus produced white water II, which consists of the drainage units 2.3, 2.4, 2.5 and 12 is taken, collected and together to a disc thickener 6 passed and thus kept away from the screen circuit of the headbox 1.

Zusätzlich wird auch noch das Reinigungswasser, welches in einer Auffangwanne 2.6 aufgefangen wird, dem Siebwasser zugeführt und zum Scheibeneindicker geleitet, da in diesem Reinigungswasser ein hoher Anteil an Pigmenten und Füllstoffen enthalten ist.In addition, there is also the cleaning water, which is in a drip pan 2.6 is collected, fed to the white water and to the disc thickener because there is a high proportion of pigments and fillers in this cleaning water is included.

Der Scheibeneindicker 6 gibt seinen Dünnstoff über die Leitung 16 an eine Mikroflotationsvorrichtung 7 und seinen Dickstoff über die Leitung 15 an einen Siebwasserbehälter 5, zu dem auch das Flotat aus der Mikroflotationsvorrichtung 7 über die Leitung 17 geführt wird. Aus diesem Siebwasserbehälter 5 wird die Pigment- und Füllstoffaufbereitung 8 mit hoch pigment- und füllstoffhaltigem Wasser gespeist, in die auch die jeweils notwendige Menge an frischem Pigmentund Füllstoff über die Zuführung 8.1 zugeführt wird.The disc thickener 6 gives its thin material via line 16 to one Microflotation device 7 and its thick matter via line 15 to one White water tank 5, which also contains the flotate from the microflotation device 7 is conducted via line 17. From this white water tank 5 is the Pigment and filler preparation 8 with high pigment and filler content Water, in which also the necessary amount of fresh pigment and Filler is fed via the feed 8.1.

Die Pigment- und Füllstoffaufbereitung 8 gibt dann die fertige Pigment- und Füllstoffslurry an die Applikatoren 11.1 und 11.2 weiter, wo sie auf die entstehende Faserbahn aufgetragen wird.The pigment and filler preparation 8 then gives the finished pigment and Filler slurry on to applicators 11.1 and 11.2, where they focus on the resulting Fiber web is applied.

Das Klarfiltrat, welches aus der Mikroflotation 7 anfällt, wird über die Leitung 18 in einen Klarfiltratbehälter 9 gespeichert und steht dem Papierherstellungsprozeß wieder als beliebig und an jeder Stelle zu verwendendes Klarwasser zur Verfügung.The clear filtrate, which is obtained from the microflotation 7, is fed in via the line 18 a clear filtrate container 9 is stored and faces the papermaking process again as clear water to be used at any point.

Ergänzend ist noch darauf hinzuweisen, daß es ebenso im Rahmen der Erfindung liegt, wenn dem Pigment- und/oder Füllstoff ein Bindemittel zugefügt wird, um beispielsweise ein Papier mit Offset-Qualität zu erzeugen. Auch hierbei gilt das Obengesagte bezüglich der Vermeidung der Anreicherung von Bindemittel in der mittleren Faserschicht des fertigen Papieres.In addition, it should be pointed out that it is also within the scope of the invention is when a binder is added to the pigment and / or filler, for example to produce a paper with offset quality. This also applies here The above regarding avoiding the accumulation of binders in the middle fiber layer of the finished paper.

Insgesamt wird also durch den oben dargestellten Siebwasserkreislauf einer Papiermaschine und das Verfahren zur Wasserzirkulation in einer Papiermaschine erreicht, das auch bei längerem Betrieb der Papiermaschine eine Anreicherung der inneren Schicht des hergestellten Papieres mit Füllstoff und/oder Pigment vermieden wird. Overall, the white water cycle of a paper machine shown above and the method of water circulation in a paper machine achieved that enrichment even when the paper machine is in operation for a long time the inner layer of the paper produced with filler and / or pigment is avoided.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Stoffauflaufheadbox
22
BlattbildungssektionSheet forming section
2.1 - 2.52.1 - 2.5
Entwässerungselementedewatering elements
2.62.6
Auffangvorrichtung für ReinigungswasserCollecting device for cleaning water
33
PressensektionPress section
44
Siebwasserbehälterwhite water tank
55
Siebwasserbehälterwhite water tank
66
ScheibeneindickerA disc
77
Mikroflotationsvorrichtungmicroflotation
88th
Pigment- und FüllstoffaufbereitungPigment and filler preparation
8.18.1
Zuführungfeed
99
KlarfiltratbehälterKlarfiltratbehälter
10.110.1
Erstes SiebFirst sieve
10.210.2
Zweites SiebSecond sieve
11.111.1
Erster ApplikatorFirst applicator
11.211.2
Zweiter ApplikatorSecond applicator
1212
Saugwalzesuction roll
1313
Siebreinigungsvorrichtungcleaning apparatus
1414
Leitung für StoffaufbereitungHead of stock preparation
1515
Leitung für Dickstoff des ScheibeneindickersLine for thick matter of the disk thickener
1616
Leitung für Dünnstoff des ScheibeneindickersLine for thin material of the disk thickener
1717
Leitung für FlotatHead of Flotat
1818
Leitung für KlarfiltratLine for clear filtrate

Claims (6)

  1. White water circuit in a paper machine which has at least one applicator for the application of a pigment-containing and/or filler-containing compound to a not yet completely dewatered fibrous web at the wet end, which is further equipped with a first white water circuit, which supplies a flowbox with white water, and further with a second white water circuit, which accommodates the rest of the white water,
    the first white water circuit being fed exclusively by dewatering elements (2.1, 2.2) which, in the production process, are arranged before the application of the pigment-containing and/or filler-containing compound, and
    part of the second white water circuit being used to feed the application of the pigment-containing and/or filler-containing compound,
    characterized in that the remaining white water from the second white water circuit and the white water not supplied to the flowbox is processed by a microflotation apparatus (7) to form clear filtrate and is fed back into the production process.
  2. White water circuit according to Claim 1, characterized in that a disc thickener (6) is connected upstream of the microflotation apparatus.
  3. White water circuit according to Claim 1 or 2, characterized in that the part of the white water which is supplied to the application of the pigment-containing and/or filler-containing compound is taken from the overflow of the disc thickener (6) and/or the flotate of the microflotation apparatus (7).
  4. Method for water circulation in a paper machine having a wet end in which a pigment-containing and/or filler-containing compound is applied to at least one surface of a fibrous web being produced and white water is removed from the fibrous web being formed,
    only the white water which is not loaded with pigments and/or fillers from the pigment and/or filler application being supplied to the flowbox (1), and
    only white water which is loaded with pigments and/or fillers from the pigment and/or filler application being supplied to the application of the pigment-containing and/or filler-containing compound,
    characterized in that
    the remaining white water from the second white water circuit, not being used to feed the application of the pigment-containing and/or filler-containing compound, and the white water not supplied to the flowbox is processed by a microflotation apparatus (7) to form clear filtrate and is fed back into the production process.
  5. Method according to Claim 4, characterized in that, upstream of a microflotation apparatus (7), precleaning is carried out by a disc thickener (6).
  6. Method according to Claim 4 or 5, characterized in that the white water which is supplied to the application of the pigment-containing and/or filler-containing compound is removed from the overflow of the disc thickener (6) and/or the flotate of the microflotation apparatus (7).
EP00108222A 1999-05-14 2000-04-14 White water circuit and process for the circulation of water in a papermachine Expired - Lifetime EP1052327B1 (en)

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DE19922391A DE19922391A1 (en) 1999-05-14 1999-05-14 White water cycle and method for water circulation in a paper machine
DE19922391 1999-05-14

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EP1052327B1 true EP1052327B1 (en) 2004-07-21

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CN106758476A (en) * 2017-03-21 2017-05-31 李飞 The closed cycle system and processing method of a kind of pulping and paper-making plain boiled water

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US8715466B1 (en) 2012-10-19 2014-05-06 Theodore Caouette Method and system for reducing water loss in a paper mill

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US1950351A (en) * 1931-08-07 1934-03-06 Mead Corp Paper manufacture
FR1341327A (en) * 1962-12-18 1963-10-25 Borax Cons Ltd Improvements to the non-combustible properties of insulating board by introducing a solution of a flame retardant compound into the board while it is in the wet state
DE3406808A1 (en) * 1984-02-24 1985-09-12 Steinbeis Papier GmbH, 7121 Gemmrigheim Process for the application of auxiliaries or finishes and dyes on the paper making machine, apparatus for carrying out the same and application processes
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US5152872A (en) * 1990-10-15 1992-10-06 Stone-Consolidated Inc. Apparatus for the wet end coating of paper
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CN106758476A (en) * 2017-03-21 2017-05-31 李飞 The closed cycle system and processing method of a kind of pulping and paper-making plain boiled water
CN106758476B (en) * 2017-03-21 2018-03-09 李飞 A kind of closed cycle system and processing method of pulping and paper-making plain boiled water

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DE19922391A1 (en) 2000-11-16
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US6497788B1 (en) 2002-12-24
ATE271627T1 (en) 2004-08-15

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