EP1712678B1 - Coating process - Google Patents

Coating process Download PDF

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Publication number
EP1712678B1
EP1712678B1 EP20060110544 EP06110544A EP1712678B1 EP 1712678 B1 EP1712678 B1 EP 1712678B1 EP 20060110544 EP20060110544 EP 20060110544 EP 06110544 A EP06110544 A EP 06110544A EP 1712678 B1 EP1712678 B1 EP 1712678B1
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EP
European Patent Office
Prior art keywords
paper
application
application medium
medium
web
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Revoked
Application number
EP20060110544
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German (de)
French (fr)
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EP1712678A2 (en
EP1712678A3 (en
Inventor
Martin Tietz
Uwe Fröhlich
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1712678A2 publication Critical patent/EP1712678A2/en
Publication of EP1712678A3 publication Critical patent/EP1712678A3/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape

Definitions

  • the invention relates to a method for applying a liquid to pasty application medium, in particular an aqueous pigment suspension on at least one side of a running paper or board web in the production of gravure paper or cardboard.
  • the invention is therefore based on the object of specifying a method by means of which a gravure-capable paper or board web of improved smoothness can be produced with likewise improved running efficiency.
  • the object is achieved in that the coating or the application of the application medium is carried out by means of a curtain applicator, wherein a coating medium (4) is used with platelet-shaped pigments having an aspect ratio of 15-60.
  • Aspect ratio is understood to mean the ratio between the area covered or the diameter of the platelet-shaped pigments of the application medium to their thickness in ⁇ m.
  • the pigment platelets (e.g., predominantly kaolin or talc) at a ratio of between 5 and 80, preferably between 15 and 60, provide a tiled and thus high smoothness of the coated surface.
  • the method according to the invention is therefore advantageous because, as already mentioned, platelet-shaped pigments are contained in the application medium. These improve the smoothing effect.
  • platelet-shaped pigments for rotogravure paper and cardboard is mainly kaolin, but also talc used.
  • the application medium is delivered to the running paper or board web as a freely falling curtain, which essentially moves as a result of gravitational force.
  • the inventors have recognized that the curtain delivered by the curtain applicator is stretched by a factor of between 5 and 20. With the stretching, the platelet-shaped pigments contained in the application medium are aligned, thereby being present when hitting the moving paper or board web strongly orientate to the surface of the track.
  • a further advantage of using curtain coating for a gravure-capable paper or board web is that it no longer requires metering of the application medium.
  • the application of the medium takes place right from the start in the right amount and also in sufficient uniformity across the coating width. This means that you do not have to apply in excess. It is applied only as much medium as should remain on the paper or board web. This pump energy is saved in the supply of the application medium and the entire effort in connection with a surplus discharge necessary according to the prior art.
  • the runnability ie running efficiency is also greatly improved by using the method according to the invention.
  • the commission is due to the non-contact application (without the use of a doctor element) the web less stressed and therefore web breaks avoided.
  • the invention also proposes that, after coating with the coating medium containing the platelet-shaped pigments, a calendering of the paper web takes place and / or further coating operations are carried out.
  • the paper or board web is pre-smoothed prior to coating with the platelet-shaped pigments coating medium, because this causes the curtain on one already relatively smooth track can hang up and therefore an even smoother end product can be reached.
  • FIG. 1 shows the FIG. 1 in a rough schematic representation of the principle of the method according to the invention.
  • FIG. 1 It is shown how the platelet-shaped pigments contained in the application medium or the pigment suspension are applied by means of a curtain applicator.
  • the curtain applicator unit 1 consists of an applicator head 2 which contains a medium distribution chamber 3 inside, from which the application medium 4, ie an aqueous pigment suspension, is discharged through a dispensing nozzle 5 in the direction of the paper or board web 6 running underneath in the running direction L. becomes.
  • the platelet-shaped pigments contained in the application medium 4 are 4.1. designated and shown in the form of short lines. It can be seen that the pigments 4.1 in the distribution chamber 3 and in the falling curtain 7 are still disordered.
  • the delivered curtain 7 extends in the course of its fall path w and when hitting the moving web 6, approximately by a factor between 5 and 20.
  • the platelet-shaped pigments are oriented 4.1 and also orientated, as indicated by horizontal lines 4.2 should be on the paper or board web surface. A subsequent, not shown Satinage or subsequent coatings are then easier to accomplish and the printability is improved.
  • such a paper or such a cardboard can be produced, which or which can later be excellently printed in the gravure printing process.

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  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Auftragen eines flüssigen bis pastösen Auftragsmediums, insbesondere einer wässrigen Pigmentsuspension auf wenigstens eine Seite einer laufenden Papier- oder Kartonbahn bei der Herstellung von tiefdruckfähigem Papier oder Karton.The invention relates to a method for applying a liquid to pasty application medium, in particular an aqueous pigment suspension on at least one side of a running paper or board web in the production of gravure paper or cardboard.

Bei der Herstellung von tiefdruckfähigem Papier, insbesondere LWC- (light weight coated, d.h. leichtgewichtig gestrichenes) Papier oder Karton (z.B. Magazinpapier) erfolgte die Beschichtung bisher mit Blade-Coatern. Diese Coater arbeiten mit einem Rakelelement (blade), mit welchem die im Überschuss aufgebrachte Auftragsmediumsschicht, auf das gewünschte Strichgewicht gebracht, dabei vergleichmäßigt und bereits etwas geglättet wird. Diese Coater haben insbesondere bei höheren Maschinen- und Bahngeschwindigkeiten einen begrenzten Laufwirkungsgrad (runnability).In the manufacture of gravure paper, in particular LWC (light weight coated) paper or board (e.g., magazine paper), coating has heretofore been done with blade coaters. These coater work with a squeegee element (blade), with which the applied in excess coating medium layer, brought to the desired coating weight, it evened out and already somewhat smoothed. These coaters have limited runnability, especially at higher machine and web speeds.

Bei Verwendung einer Filmpresse, wo die zu beschichtende Bahn zwischen zwei miteinander einen Pressspalt (Nip) bildende Walzen geführt wird und im Nip das zuvor auf die Oberfläche der Walzen aufgebrachte Auftragsmedium an eine oder beide Seiten der Papier- oder Kartonbahn abgegeben wird, ist zwar der Laufwirkungsgrad besser, aber man erzielt eine weniger gute Glätte beim Abzug der beschichteten Bahn aus dem Nip der Filmpresse.When using a film press, where the web to be coated is passed between two pressing nip forming rollers and in the nip the previously applied to the surface of the rollers application medium is discharged to one or both sides of the paper or board web, while the Running efficiency better, but one achieves a less good smoothness in the deduction of the coated web from the nip of the film press.

Die Verwendung eines Vorhang- Auftragswerkes für das Auftragen von Streichfarbe mit hohem Feststoffgehalt geht aus der EP 1 516 959 A1 hervor.The use of a curtain applicator for the application of high solids coating color goes from the EP 1 516 959 A1 out.

Aus der DE 197 16 647 A1 ist eine Vorrichtung und ein Verfahren zum Auftragen einer Pigmentstreichfarbe entnehmbar, die mit einer oberhalb der Bahn sich quer zur Bahnlaufrichtung erstreckenden Schlitzdüse in einem frei fallenden Vorhang aufgebracht wird.From the DE 197 16 647 A1 a device and a method for applying a pigment coating color can be removed, which is applied with a above the web extending transversely to the web running slot in a free-falling curtain.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren anzugeben, mit der eine tiefdruckfähige Papier- oder Kartonbahn von verbesserter Glätte bei ebenfalls verbessertem Laufwirkungsgrad herstellbar ist.The invention is therefore based on the object of specifying a method by means of which a gravure-capable paper or board web of improved smoothness can be produced with likewise improved running efficiency.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass die Beschichtung bzw. das Auftragen des Auftragsmediums mit Hilfe eines Vorhang-Auftragswerkes durchgeführt wird, wobei ein Auftragsmedium (4) mit plättchenförmigen Pigmenten mit einem Aspect Ratio von 15-60 verwendet wird.According to the invention the object is achieved in that the coating or the application of the application medium is carried out by means of a curtain applicator, wherein a coating medium (4) is used with platelet-shaped pigments having an aspect ratio of 15-60.

Unter "Aspect Ratio" versteht man das Verhältnis zwischen abgedeckter Fläche bzw. Durchmesser der plättchenförmigen Pigmente des Auftragsmediums zu ihrer Dicke in µm."Aspect ratio" is understood to mean the ratio between the area covered or the diameter of the platelet-shaped pigments of the application medium to their thickness in μm.

Die Pigmentplättchen (z.B. vorwiegend Kaolin oder Talkum) ergeben bei einem Verhältnis zwischen 5 - 80, vorzugsweise zwischen 15-60 eine dachziegelartige und damit hohe Glätte der beschichteten Oberfläche.The pigment platelets (e.g., predominantly kaolin or talc) at a ratio of between 5 and 80, preferably between 15 and 60, provide a tiled and thus high smoothness of the coated surface.

Mit dem erfindungsgemäßen Verfahren wird dies erstmalig erreicht.This is achieved for the first time with the method according to the invention.

Das erfindungsgemäße Verfahren ist deshalb so vorteilhaft, weil wie schon erwähnt, plättchenförmige Pigmente im Auftragsmedium enthalten sind. Diese verbessern den Glättungseffekt.The method according to the invention is therefore advantageous because, as already mentioned, platelet-shaped pigments are contained in the application medium. These improve the smoothing effect.

Als plättchenförmige Pigmente für Tiefdruckpapier und -Karton kommt vorwiegend Kaolin, aber auch Talkum zum Einsatz.As platelet-shaped pigments for rotogravure paper and cardboard is mainly kaolin, but also talc used.

Bei dem Vorhang- Auftragswerk (auch als Curtain Coater bezeichnet) wird das Auftragsmedium als sich im Wesentlichen schwerkraftbedingt bewegenden, frei fallenden Vorhang kontaktlos an die laufende Papier- oder Kartonbahn abgegeben.In the case of the curtain applicator (also referred to as curtain coater), the application medium is delivered to the running paper or board web as a freely falling curtain, which essentially moves as a result of gravitational force.

Die Erfinder haben erkannt, dass der vom Vorhang-Auftragswerk abgegebene Vorhang gestreckt wird und zwar um einen Faktor zwischen 5 und 20. Mit der Streckung werden die im Auftragsmedium enthaltenen plättchenförmigen Pigmente ausgerichtet, wobei sie sich beim Auftreffen auf die laufende Papier- oder Kartonbahn dabei stark an die Bahnoberfläche orientieren.The inventors have recognized that the curtain delivered by the curtain applicator is stretched by a factor of between 5 and 20. With the stretching, the platelet-shaped pigments contained in the application medium are aligned, thereby being present when hitting the moving paper or board web strongly orientate to the surface of the track.

Dieses Phänomen ist ideal für eine Satinage in einem nachfolgenden Kalander und für die Bedruckbarkeit mittels Tiefdruckverfahren.
Die Erfindung ist daher sehr geeignet für die Herstellung von LWC (light weight coated) - Papier oder Karton.This phenomenon is ideal for calendering in a subsequent calender and for gravure printing.
The invention is therefore very suitable for the production of LWC (l ight W eight C oated) - paper or cardboard.

Ein weiterer Vorteil der Anwendung des Vorhang-Streichens für eine tiefdruckfähige Papier- oder Kartonbahn ist, dass dabei keine Dosierung des Auftragsmediums mehr erforderlich ist. Der Auftrag des Mediums erfolgt von vornherein schon in der richtigen Menge und auch in ausreichender Gleichmäßigkeit über die Beschichtungsbreite hinweg. Das bedeutet, dass nicht im Überschuss aufgetragen werden muss. Es wird nur soviel Medium aufgetragen, wie auch auf der Papier- oder Kartonbahn verbleiben soll.
Damit wird Pumpenergie bei der Zufuhr des Auftragsmediums und der gesamte Aufwand im Zusammenhang mit einer gemäß Stand der Technik notwendigen Überschussabfuhr eingespart.A further advantage of using curtain coating for a gravure-capable paper or board web is that it no longer requires metering of the application medium. The application of the medium takes place right from the start in the right amount and also in sufficient uniformity across the coating width. This means that you do not have to apply in excess. It is applied only as much medium as should remain on the paper or board web.
This pump energy is saved in the supply of the application medium and the entire effort in connection with a surplus discharge necessary according to the prior art.

Die Runnability (d.h. Laufwirkungsgrad)wird ebenfalls durch Anwendung des erfindungsgemäßen Verfahrens stark verbessert. Am Auftragswerk wird wegen des kontaktlos erfolgenden Auftragens (ohne Anwendung eines Rakelelementes) die Bahn weniger beansprucht und Bahnabrisse daher vermieden.The runnability (ie running efficiency) is also greatly improved by using the method according to the invention. The commission is due to the non-contact application (without the use of a doctor element) the web less stressed and therefore web breaks avoided.

Außerdem treten dadurch die bei einem Blade als Rakelelement befürchteten Nachteile des sogenannten "Überkochens" oder zu hohem Blade-Druck, wenn a) der Feststoffgehalt des Auftragsmediums zu hoch ist oder b) das sogenannte "Aspect Ratio" zu hoch ist, nicht auf.In addition, thereby occur in a blade as a doctor blade feared disadvantages of the so-called "overcooking" or too high blade pressure, if a) the solids content of the coating medium is too high or b) the so-called "aspect ratio" is too high, not on.

Die Erfindung schlägt außerdem vor, dass im Anschluss an das Beschichten mit dem plättchenförmige Pigmente enthaltenen Auftragsmedium ein Kalandrieren der Papierbahn erfolgt und/oder weitere Beschichtungsvorgänge vorgenommen werden.The invention also proposes that, after coating with the coating medium containing the platelet-shaped pigments, a calendering of the paper web takes place and / or further coating operations are carried out.

In bestimmten Fällen kann es zweckmäßig sein, wenn vor der Beschichtung mit dem plättchenförmigen Pigmente enthaltenen Auftragsmedium die Papier- oder Kartonbahn auch vorgeglättet wird, weil dadurch sich der Vorhang auf eine schon relativ glatte Bahn auflegen kann und daher ein noch glatteres Endprodukt erreichbar ist.In certain cases, it may be expedient if the paper or board web is pre-smoothed prior to coating with the platelet-shaped pigments coating medium, because this causes the curtain on one already relatively smooth track can hang up and therefore an even smoother end product can be reached.

Nachfolgend soll die Erfindung anhand eines Ausführungsbeispieles näher erläutert werden.The invention will be explained in more detail with reference to an embodiment.

Es zeigt die Figur 1 in grobschematischer Darstellung das Prinzip des erfindungsgemäßen Verfahrens.It shows the FIG. 1 in a rough schematic representation of the principle of the method according to the invention.

In Figur 1 ist gezeigt, wie die im Auftragsmedium, bzw. der Pigmentsuspension enthaltenen plättchenförmigen Pigmente mit Hilfe eines Vorhang- Auftragswerkes aufgebracht werden.In FIG. 1 It is shown how the platelet-shaped pigments contained in the application medium or the pigment suspension are applied by means of a curtain applicator.

Das Vorhang-Auftragswerk 1 besteht aus einem Auftragskopf 2, der im Inneren eine Mediums-Verteilkammer 3 enthält, von der das Auftragsmedium 4, d.h. eine wässrige Pigmentsuspension durch eine Abgabedüse 5 in Richtung auf die darunter in Laufrichtung L laufende Papier- oder Kartonbahn 6 abgegeben wird.
Die im Auftragsmedium 4 enthaltenen plättchenförmigen Pigmente sind mit 4.1. bezeichnet und in Form von kurzen Strichen dargestellt. Man erkennt, dass die Pigmente 4.1 in der Verteilkammer 3 und im fallenden Vorhang 7 noch ungeordnet sind. Der abgegebene Vorhang 7 streckt sich im Verlauf seines Fallweges w und beim Auftreffen auf die laufende Bahn 6, ca. um einen Faktor zwischen 5 und 20. Dadurch orientieren sich die plättchenförmigen Pigmente 4.1 und legen sich auch so orientiert, was mit waagerechten Strichen 4.2 angedeutet sein soll, auf der Papier- oder Kartonbahnoberfläche ab. Eine nachfolgende, nicht dargestellte Satinage oder noch nachfolgende Beschichtungen sind dann einfacher zu bewerkstelligen und die Bedruckbarkeit wird so verbessert.The curtain applicator unit 1 consists of an applicator head 2 which contains a medium distribution chamber 3 inside, from which the application medium 4, ie an aqueous pigment suspension, is discharged through a dispensing nozzle 5 in the direction of the paper or board web 6 running underneath in the running direction L. becomes.
The platelet-shaped pigments contained in the application medium 4 are 4.1. designated and shown in the form of short lines. It can be seen that the pigments 4.1 in the distribution chamber 3 and in the falling curtain 7 are still disordered. The delivered curtain 7 extends in the course of its fall path w and when hitting the moving web 6, approximately by a factor between 5 and 20. Thus, the platelet-shaped pigments are oriented 4.1 and also orientated, as indicated by horizontal lines 4.2 should be on the paper or board web surface. A subsequent, not shown Satinage or subsequent coatings are then easier to accomplish and the printability is improved.

Insgesamt kann mit dem erfindungsgemäßen Verfahren ein solches Papier oder ein solcher Karton hergestellt werden, welches bzw. welcher sich später hervorragend im Tiefdruckverfahren bedrucken lässt.Overall, with the method according to the invention, such a paper or such a cardboard can be produced, which or which can later be excellently printed in the gravure printing process.

Claims (4)

  1. Method for applying a liquid to pasty application medium (4), in particular an aqueous pigment suspension to at least one side of a running paper or cardboard web (6) during the production of paper or cardboard which can be gravure printed, the application of the application medium (4) taking place with the aid of a curtain applicator (1) which outputs the application medium to the running paper or cardboard web as a free-falling curtain which moves in a manner which is induced substantially by gravity, without the use of a doctor element, characterized in that an application medium (4) is used which contains flaky pigments with an aspect ratio of from 15 to 60.
  2. Method according to Claim 1, characterized in that kaolin flakes or talc flakes or kaolin and talc flakes together are used as flaky pigments (4.1).
  3. Method according to Claim 1 or 2, characterized in that, following the application of the application medium (4) which contains flaky pigments (4.1), calendering of the paper or cardboard web (6) takes place and/or further coating operations are performed.
  4. Method according to Claims 1 to 3, characterized in that the paper or cardboard web (6) is presmoothed before the application of the application medium (4) which contains flaky pigments (4.1).
EP20060110544 2005-04-16 2006-03-01 Coating process Revoked EP1712678B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510017547 DE102005017547A1 (en) 2005-04-16 2005-04-16 Application process

Publications (3)

Publication Number Publication Date
EP1712678A2 EP1712678A2 (en) 2006-10-18
EP1712678A3 EP1712678A3 (en) 2010-12-22
EP1712678B1 true EP1712678B1 (en) 2012-10-24

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EP20060110544 Revoked EP1712678B1 (en) 2005-04-16 2006-03-01 Coating process

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DE (1) DE102005017547A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009048820A1 (en) 2009-10-09 2011-04-14 Andritz Küsters Gmbh Curtain applicator
DE102012004875B3 (en) * 2012-03-10 2012-07-19 Andritz Küsters Gmbh Device for curtain coating current material web e.g. paper web, has guide comprising suction apparatus with suction channel, and nozzle provided at channel, where steam at rear side of suction slot is injected into channel via nozzle
DE102014013996A1 (en) 2014-09-25 2016-03-31 Andritz Küsters Gmbh Method and apparatus for curtain coating
DE102021118907A1 (en) 2021-07-21 2023-01-26 Diehl Brass Solutions Stiftung & Co. Kg Lead-free brass alloy and uses thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19716647A1 (en) * 1997-04-21 1998-10-22 Jagenberg Papiertech Gmbh Method and device for applying a pigment coating ink to a paper or cardboard web
DE10343273A1 (en) * 2003-09-17 2005-04-21 Voith Paper Patent Gmbh Coating machine for applying at least one color with a high solids content

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Publication number Publication date
EP1712678A2 (en) 2006-10-18
EP1712678A3 (en) 2010-12-22
DE102005017547A1 (en) 2006-10-19

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