EP1433899B1 - Process and apparatus for treating a paper or cardboard - Google Patents

Process and apparatus for treating a paper or cardboard Download PDF

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Publication number
EP1433899B1
EP1433899B1 EP03025268A EP03025268A EP1433899B1 EP 1433899 B1 EP1433899 B1 EP 1433899B1 EP 03025268 A EP03025268 A EP 03025268A EP 03025268 A EP03025268 A EP 03025268A EP 1433899 B1 EP1433899 B1 EP 1433899B1
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European Patent Office
Prior art keywords
web
coating
nip
application device
contour
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EP03025268A
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German (de)
French (fr)
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EP1433899A2 (en
EP1433899A3 (en
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Rüdiger Dr. Kurtz
Jörg Dr. Rheims
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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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • 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
    • D21H19/66—Coatings characterised by a special visual effect, e.g. patterned, textured
    • D21H19/68—Coatings characterised by a special visual effect, e.g. patterned, textured uneven, broken, discontinuous
    • 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
    • D21H23/30—Pretreatment of the paper

Definitions

  • the invention relates to a method for treating a paper or board web, in which the web is dried, a line is applied to the web and the web is calendered before the application of the line in a nip, wherein the line is applied as a contour line. Furthermore, the invention relates to a device for treating a paper or board web with an application device for applying a stroke, in front of which a nip nip calender is arranged, wherein the application device is designed as a contour line application device.
  • Out DE 197 15 345 A1 is a method for producing a coated web, in particular a paper or board web disclosed, wherein prior to the application of the first order still Vorglättung example can be performed with a Breitnipglätttechnik.
  • the application of the stroke is carried out with a free-jet nozzle or a roller applicator, whereby a contour stroke effect can be achieved by using a profiled metering rod.
  • the web can also be provided after a primer with a middle line and a top coat.
  • DE 194 45 408 A1 discloses a method for surface finishing a board web, wherein the web is first provided with a precoat, and then provided with a final stroke after a smoothing process.
  • the job can be done in the form of a contour stroke.
  • it is not disclosed to satin the web before the first coat application in a nip and to dry after the coating order.
  • a Yankee cylinder In paperboard production, a Yankee cylinder, commonly called a Yankee cylinder, is used to set the surface properties of the carton in a defined manner. Similarly, certain paper webs are treated on a Yankee cylinder.
  • the Yankee cylinder is installed at a certain point on the dryer section of a paper or board machine where the web has already been somewhat dried is. Since the moisture content of the web at the location of the yankee cylinder can be changed only within narrow limits, this considerably restricts the flexibility in the production of different grades or basis weights on the same machine and, inter alia, prevents the production speed from being increased.
  • the Yankee cylinder has been replaced by a nip calender, i. by a calender having a pressure treatment zone which, viewed in the web running direction, is longer than a pressure treatment zone formed between two rollers pressed against one another.
  • the invention has for its object to improve the printability.
  • This object is achieved in a method of the type mentioned above by drying the web after coating and then applying a coat of paint.
  • a contour stroke the surface of the web is not leveled, but a relatively uniform thickness layer is applied to the surface of the web.
  • This layer follows the contour of the web, i. a surface structure, which manifests itself for example in a roughness, remains largely intact. It is believed that the penetration of coating and / or printing ink in the surface area is made uniform, so that the color-striking in the print quality affecting order of magnitude of the surface structure is more uniform and thus improves the print quality. It is of course possible to apply further coatings to the web after the contour stroke. However, the contour stroke should at least be largely dried before another job is done. Another treatment of the contour stroke is of course possible. However, one should avoid that the contour line is leveled, for example by a squeegee or a scraper.
  • the web is dried in the nip before the satin finish.
  • the web then has a slightly lower humidity when it enters the nip. It is usually further dried in the nip under the action of heat. In this way, good conditions for the application of a contour stroke can be created.
  • a treatment length in the nip of at least 40 mm is used.
  • a treatment length sufficient periods are available even at higher web speeds, in which the web can be subjected to heat and elevated pressure.
  • At least one circumferential band is used to limit the wide nip.
  • the wide nip there are various possibilities for the formation of the wide nip.
  • the band is formed by the shell of the shoe roll.
  • a more flexible belt which is pressed against a roller with the aid of deflection rollers and a support shoe.
  • two bands pressed against each other to form the broad nip it is also possible to use two bands pressed against each other to form the broad nip.
  • a spray, free jet or roller application is used to apply the coating. All of these methods are well suited to creating a contour stroke.
  • Glue, starch and / or pigment are preferably used as the coating. These fabrics work well for a contour stroke.
  • the stroke is designed as a precoat. On the precoat is then applied another stroke. If the precoat is formed as a contour stroke, there are fewer problems with printability later on, regardless of what is still applied to the web on further coatings.
  • the object is achieved in a device of the type mentioned above in that behind the application device, a drying device and a further application device is provided.
  • the application device is designed as a spray, free-jet or roller application device. All of these applicators are well suited to apply a contour line to the surface of the web.
  • the Breitnipkalander has a treatment length of at least 40 mm. With this length, a sufficient treatment time is ensured, so that the web can be sufficiently pre-smoothed.
  • the Breitnipkalander on at least one circulating belt.
  • This relatively large treatment lengths can be relatively easily realized, ie you get with little effort larger treatment lengths than in the formation of a nip, which has been realized by two pressed against each other rollers.
  • a device 1 for treating a paper or board web 2 (hereinafter referred to as "web" for short) has a broad nip calender 3.
  • the Breitnipkalander 3 has a roller 4, which cooperates with a circulating belt 5 to form a nip 6.
  • the band 5 is pressed by means of a pressure shoe 7, which has a support surface 8, against the roller 4.
  • the roller 4 may be heated so as to pressurize the web 2 not only with the elevated pressure prevailing in the nip 6, but also with an elevated temperature.
  • the support surface 8 may have a curvature which is adapted to the curvature of the roller 4.
  • the nip 6 has an active length of at least 40 mm, i. the web 2 is applied in the nip 6 on a length of at least 40 mm with increased pressure and elevated temperature.
  • the band 5 may be the jacket of a so-called shoe roll. In this case, it is relatively stiff but resilient enough to conform to the curvature of the roller 4.
  • the band 5 can also be designed as a flexible band, which, as shown, is guided over a plurality of support rollers 9 in circulation.
  • the train is running in Fig. 1 left to right.
  • the web running direction 10 is marked by an arrow.
  • a heating device 11 is arranged, with which the web 2 is pre-dried.
  • web 2 should still have some moisture.
  • an application device 12 is arranged for a bar.
  • the application device 12 coats the web 2 with a coating of glue, starch and / or pigment.
  • the stroke is sometimes referred to as a coating color.
  • a further drying device 13 is provided, with the aid of the web 2 can be dried to dry the line. Accordingly, behind the drying device 13, a further application device 14 may be provided, in which a further line can be applied. Accordingly, a precoat can be applied in the applicator 12, while a coat of ink is applied in the applicator 14.
  • the application device 12 is designed as a contour line application device.
  • a contour stroke does not equalize the surface of the web, such as a blade stroke.
  • the Coating paint is therefore not smoothed by a squeegee or scraper. Although this would bring a relatively smooth surface with it.
  • problems may arise which are referred to as "print mottling".
  • a coating is applied to the surface of the web 2, which has a uniform thickness and the contour of the surface of the web 2 follows.
  • the surface of the bar basically has the same or at least a similar structure to the surface of the lane 2 itself. In doing so, a reduced smoothness is accepted. The printability is significantly improved.
  • the applicator 12 is formed as a roller press with two rollers 15, 16, wherein each roller 15, 16 with a nozzle 17, 18 cooperates, which applies a "film" on the surface of the rollers 15, 16. This film then transfers to the web 2.
  • Fig. 2 shows an alternative embodiment of the applicator 12, in which the line is applied by spray nozzles 19, 20 directly on the surfaces of the web 2.
  • the line is applied by spray nozzles 19, 20 directly on the surfaces of the web 2.
  • curtain coater also called “curtain coater” applicator 12 can be in principle, achieve an ideal contour line in which a capillary penetration of the coating takes place in the surface of the web 2. Again, you can omit a spray nozzle, if only a one-sided order of the stroke is desired.

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Abstract

In a process to treat a moving paper or carton web, the web is dried and passes through a broad nip calender where it is glazed. After passing through the nip esp. a contoured strip coat is applied to the web by spray, free jet or drum. The web is pre-dried before passing through the broad nip that is at least 40 mm wide and limited by a rotating belt (5). The strip applied is an undercoat of glue, starch and/or pigment. Also claimed is a commensurate assembly (12).

Description

Die Erfindung betrifft ein Verfahren zum Behandeln einer Papier- oder Kartonbahn, bei dem man die Bahn trocknet, einen Strich auf die Bahn aufträgt und die Bahn vor dem Auftragen des Strichs in einem Breitnip satiniert, wobei man den Strich als Konturstrich aufträgt. Ferner betrifft die Erfindung eine Vorrichtung zum Behandeln einer Papier- oder Kartonbahn mit einer Auftragseinrichtung zum Auftragen eines Strichs, vor der ein Breitnipkalander angeordnet ist, wobei die Auftragseinrichtung als Konturstrich-Auftragseinrichtung ausgebildet ist.The invention relates to a method for treating a paper or board web, in which the web is dried, a line is applied to the web and the web is calendered before the application of the line in a nip, wherein the line is applied as a contour line. Furthermore, the invention relates to a device for treating a paper or board web with an application device for applying a stroke, in front of which a nip nip calender is arranged, wherein the application device is designed as a contour line application device.

Aus DE 197 15 345 A1 ist ein Verfahren zur Herstellung einer gestrichenen Bahn, insbesondere einer Papier- oder Kartonbahn, offenbart, wobei vor dem Aufbringen des ersten Auftrags noch eine Vorglättung beispielsweise mit einem Breitnipglättwerk durchgeführt werden kann. Der Auftrag des Strichs erfolgt dabei mit einem Freistrahldüsenauftragwerk oder einem Walzenauftragwerk, wobei durch Nutzen eines profilierten Rakelstabs ein Konturstricheffekt erzielt werden kann. Die Bahn kann im Anschluss an einen Vorstrich auch noch mit einem Mittelstrich und einem Deckstrich versehen werden.Out DE 197 15 345 A1 is a method for producing a coated web, in particular a paper or board web disclosed, wherein prior to the application of the first order still Vorglättung example can be performed with a Breitnipglättwerk. The application of the stroke is carried out with a free-jet nozzle or a roller applicator, whereby a contour stroke effect can be achieved by using a profiled metering rod. The web can also be provided after a primer with a middle line and a top coat.

Ein weiteres Verfahren und eine entsprechende Vorrichtung sind aus EP 0 815 319 B1 bekannt.Another method and apparatus are out EP 0 815 319 B1 known.

In DE 194 45 408 A1 ist ein Verfahren zur Oberflächenveredelung einer Kartonbahn offenbart, wobei die Bahn zunächst mit einem Vorstrich versehen wird, um dann nach einem Glättvorgang mit einem Abschlussstrich versehen zu werden. Dabei kann der Auftrag in Form eines Konturstrichs erfolgen. Es ist aber nicht offenbart, die Bahn vor dem ersten Strichauftrag in einem Breitnip zu satinieren und nach dem Strichauftrag zu trocknen.In DE 194 45 408 A1 discloses a method for surface finishing a board web, wherein the web is first provided with a precoat, and then provided with a final stroke after a smoothing process. The job can be done in the form of a contour stroke. However, it is not disclosed to satin the web before the first coat application in a nip and to dry after the coating order.

Aus DE 197 19 128 A1 ist eine Vorrichtung zum Auftragen von Beschichtungsmaterial bekannt, mit der ein Konturstrich auf eine Papier- oder Kartonbahn aufgetragen werden kann.Out DE 197 19 128 A1 a device for applying coating material is known, with which a contour line can be applied to a paper or board web.

In der Kartonherstellung wird üblicherweise ein Glättzylinder, der auch als Yankee-Zylinder bezeichnet wird, eingesetzt, um die Oberflächeneigenschaften des Kartons definiert einzustellen. In ähnlicher Weise werden auch gewisse Papierbahnen auf einem Glättzylinder behandelt. Der Glättzylinder ist an einer bestimmten Stelle der Trockenpartie einer Papier- oder Kartonmaschine installiert, an der die Bahn bereits etwas getrocknet worden ist. Da die Bahnfeuchte an der Stelle des Glättzylinders nur in engen Grenzen verändert werden kann, schränkt dies die Flexibilität bei der Produktion unterschiedlicher Sorten bzw. Flächengewichte auf der gleichen Maschine erheblich ein und verhindert u.a., daß die Produktionsgeschwindigkeit erhöht werden kann.In paperboard production, a Yankee cylinder, commonly called a Yankee cylinder, is used to set the surface properties of the carton in a defined manner. Similarly, certain paper webs are treated on a Yankee cylinder. The Yankee cylinder is installed at a certain point on the dryer section of a paper or board machine where the web has already been somewhat dried is. Since the moisture content of the web at the location of the yankee cylinder can be changed only within narrow limits, this considerably restricts the flexibility in the production of different grades or basis weights on the same machine and, inter alia, prevents the production speed from being increased.

Man hat daher den Glättzylinder durch einen Breitnipkalander ersetzt, d.h. durch einen Kalander, der eine Druckbehandlungszone aufweist, die in Bahnlaufrichtung gesehen länger ist als eine Druckbehandlungszone, die zwischen zwei gegeneinander gepreßte Walzen gebildet ist.Therefore, the Yankee cylinder has been replaced by a nip calender, i. by a calender having a pressure treatment zone which, viewed in the web running direction, is longer than a pressure treatment zone formed between two rollers pressed against one another.

Die so hergestellten Papiere oder Kartonbahnen weisen relativ glatte Oberflächen auf. Überraschenderweise ist aber die Bedruckbarkeit dieser mit einem verlängerten Kalandernip oder Breitnip hergestellten Papier- oder Kartonbahnen trotz einer guten Oberflächenqualität deutlich schlechter. Es zeigt sich in erheblichem Umfang eine Ungleichmäßigkeit im Druck, ein so genanntes Druck-Mottling.The papers or board webs thus produced have relatively smooth surfaces. Surprisingly, however, the printability of this paper or board webs produced with an extended calender nip or wide nip is significantly worse despite a good surface quality. There is considerable unevenness in the print, a so-called print mottling.

Der Erfindung liegt die Aufgabe zugrunde, die Bedruckbarkeit zu verbessern.The invention has for its object to improve the printability.

Diese Aufgabe wird bei einem Verfahren der eingangs genannten Art dadurch gelöst, daß man die Bahn nach dem Strichauftrag trocknet und anschließend einen Nachstrich aufträgt.This object is achieved in a method of the type mentioned above by drying the web after coating and then applying a coat of paint.

Bei einem Konturstrich wird die Oberfläche der Bahn nicht nivelliert, sondern es wird eine relativ gleichförmig dicke Schicht auf die Oberfläche der Bahn aufgetragen. Diese Schicht folgt der Kontur der Bahn, d.h. eine Oberflächenstruktur, die sich beispielsweise in einer Rauhigkeit äußert, bleibt weitgehend erhalten. Man nimmt an, daß die Penetration von Streich- und/oder Druckfarbe im Oberflächenbereich vergleichmäßigt wird, so daß auch das Farbwegschlagen in der die Druckqualität beeinflussenden Größenordnung der Oberflächenstruktur gleichmäßiger wird und sich so die Druckqualität verbessert. Es ist natürlich möglich, nach dem Konturstrich noch weitere Beschichtungen auf die Bahn aufzutragen. Der Konturstrich sollte aber zumindest weitgehend getrocknet sein, bevor ein weiterer Auftrag erfolgt. Auch eine andere Behandlung des Konturstrichs ist natürlich möglich. Man sollte allerdings vermeiden, daß der Konturstrich eingeebnet wird, beispielsweise durch einen Rakel oder einen Schaber.In a contour stroke, the surface of the web is not leveled, but a relatively uniform thickness layer is applied to the surface of the web. This layer follows the contour of the web, i. a surface structure, which manifests itself for example in a roughness, remains largely intact. It is believed that the penetration of coating and / or printing ink in the surface area is made uniform, so that the color-striking in the print quality affecting order of magnitude of the surface structure is more uniform and thus improves the print quality. It is of course possible to apply further coatings to the web after the contour stroke. However, the contour stroke should at least be largely dried before another job is done. Another treatment of the contour stroke is of course possible. However, one should avoid that the contour line is leveled, for example by a squeegee or a scraper.

Vorzugsweise trocknet man die Bahn vor dem Satinieren im Breitnip vor. Die Bahn hat dann eine etwas geringere Feuchtigkeit, wenn sie in den Breitnip einläuft. Sie wird im Breitnip in der Regel unter der Einwirkung von Wärme weiter getrocknet. Auf diese Weise lassen sich gute Bedingungen für den Auftrag eines Konturstrichs schaffen.Preferably, the web is dried in the nip before the satin finish. The web then has a slightly lower humidity when it enters the nip. It is usually further dried in the nip under the action of heat. In this way, good conditions for the application of a contour stroke can be created.

Vorzugsweise verwendet man eine Behandlungslänge im Breitnip von mindestens 40 mm. Mit einer derartigen Behandlungslänge stehen auch bei größeren Bahngeschwindigkeiten ausreichende Zeiträume zur Verfügung, in denen die Bahn mit Wärme und erhöhtem Druck beaufschlagt werden kann.Preferably, a treatment length in the nip of at least 40 mm is used. With such a treatment length, sufficient periods are available even at higher web speeds, in which the web can be subjected to heat and elevated pressure.

Vorzugsweise verwendet man zur Begrenzung des Breitnips mindestens ein umlaufendes Band. Für die Ausbildung des Breitnips gibt es verschiedene Möglichkeiten. Man kann beispielsweise eine Schuhwalze verwenden, die mit einer normalen Walze zusammenwirkt. In diesem Fall wird das Band durch den Mantel der Schuhwalze gebildet. Man kann auch ein flexibleres Band verwenden, das mit Hilfe von Umlenkrollen und einem Stützschuh gegen eine Walze gedrückt wird. Schließlich ist es auch möglich, zwei gegeneinander gepreßte Bänder zu verwenden, um den Breitnip zu bilden.Preferably, at least one circumferential band is used to limit the wide nip. There are various possibilities for the formation of the wide nip. For example, one can use a shoe roll which cooperates with a normal roller. In this case, the band is formed by the shell of the shoe roll. It is also possible to use a more flexible belt which is pressed against a roller with the aid of deflection rollers and a support shoe. Finally, it is also possible to use two bands pressed against each other to form the broad nip.

Vorzugsweise verwendet man zum Auftragen des Strichs einen Sprüh-, Freistrahl- oder Walzenauftrag. Alle diese Verfahren sind gut geeignet, um einen Konturstrich zu erzeugen.Preferably, a spray, free jet or roller application is used to apply the coating. All of these methods are well suited to creating a contour stroke.

Vorzugsweise verwendet man als Strich Leim, Stärke und/oder Pigment. Diese Stoffe eignen sich gut für einen Konturstrich.Glue, starch and / or pigment are preferably used as the coating. These fabrics work well for a contour stroke.

Bevorzugterweise ist der Strich als Vorstrich ausgebildet. Auf den Vorstrich wird dann ein weiterer Strich aufgetragen. Wenn der Vorstrich als Konturstrich ausgebildet ist, ergeben sich später weniger Probleme bei der Bedruckbarkeit und zwar unabhängig davon, was noch an weiteren Beschichtungen auf die Bahn aufgebracht wird.Preferably, the stroke is designed as a precoat. On the precoat is then applied another stroke. If the precoat is formed as a contour stroke, there are fewer problems with printability later on, regardless of what is still applied to the web on further coatings.

Die Aufgabe wird bei einer Vorrichtung der eingangs genannten Art dadurch gelöst, daß hinter der Auftragseinrichtung eine Trocknungseinrichtung und eine weitere Auftragseinrichtung vorgesehen ist.The object is achieved in a device of the type mentioned above in that behind the application device, a drying device and a further application device is provided.

Wie oben ausgeführt, ist beim Auftrag eines Konturstrichs die Oberfläche der Bahn nicht egalisiert, sondern sie ist von einer Beschichtung mit einer gleichförmigen Dicke überzogen. Diese Beschichtung, der Strich, folgt der Oberflächenkontur der Bahn. Erstaunlicherweise werden dadurch die Probleme mit der Bedruckbarkeit, insbesondere dem Druck-Mottling, verringert.As noted above, when a contour stroke is applied, the surface of the web is not leveled, but is coated with a coating of uniform thickness. This coating, the stroke, follows the surface contour of the web. Surprisingly, this reduces the problems with printability, in particular printing mottling.

Vorzugsweise ist die Auftragseinrichtung als Sprüh-, Freistrahl- oder Walzenauftragseinrichtung ausgebildet. Alle diese Auftragseinrichtungen sind gut geeignet, einen Konturstrich auf die Oberfläche der Bahn aufzubringen.Preferably, the application device is designed as a spray, free-jet or roller application device. All of these applicators are well suited to apply a contour line to the surface of the web.

Bevorzugterweise weist der Breitnipkalander eine Behandlungslänge von mindestens 40 mm auf. Mit dieser Länge ist eine ausreichende Behandlungszeit gewährleistet, so daß die Bahn in ausreichendem Maße vorgeglättet werden kann.Preferably, the Breitnipkalander has a treatment length of at least 40 mm. With this length, a sufficient treatment time is ensured, so that the web can be sufficiently pre-smoothed.

Bevorzugterweise weist der Breitnipkalander mindestens ein umlaufendes Band auf. Damit lassen sich relativ große Behandlungslängen relativ einfach realisieren, d.h. man bekommt mit wenig Aufwand größere Behandlungslängen als bei der Ausbildung eines Nips, der durch zwei gegeneinander gedrückte Walzen realisiert worden ist.Preferably, the Breitnipkalander on at least one circulating belt. This relatively large treatment lengths can be relatively easily realized, ie you get with little effort larger treatment lengths than in the formation of a nip, which has been realized by two pressed against each other rollers.

Die Erfindung wird im folgenden anhand von bevorzugten Ausführungsbeispielen in Verbindung mit der Zeichnung näher beschrieben. Hierin zeigen:

Fig. 1
eine erste Ausführungsform einer Vorrichtung zum Behandeln einer Kartonbahn und
Fig. 2
einen Ausschnitt aus einer zweiten Vorrichtung.
The invention will be described in more detail below with reference to preferred embodiments in conjunction with the drawings. Herein show:
Fig. 1
a first embodiment of an apparatus for treating a board web and
Fig. 2
a section of a second device.

Eine Vorrichtung 1 zum Behandeln einer Papier- oder Kartonbahn 2 (im folgenden kurz "Bahn" genannt) weist einen Breitnipkalander 3 auf.A device 1 for treating a paper or board web 2 (hereinafter referred to as "web" for short) has a broad nip calender 3.

Der Breitnipkalander 3 weist eine Walze 4 auf, die mit einem umlaufenden Band 5 zusammenwirkt, um einen Breitnip 6 zu bilden. Das Band 5 ist mit Hilfe eines Anpreßschuhs 7, der eine Stützfläche 8 aufweist, gegen die Walze 4 gepreßt. Die Walze 4 kann beheizt sein, um die Bahn 2 nicht nur mit dem im Breitnip 6 herrschenden erhöhten Druck, sondern auch mit einer erhöhten Temperatur zu beaufschlagen. Die Stützfläche 8 kann eine Krümmung aufweisen, die an die Krümmung der Walze 4 angepaßt ist.The Breitnipkalander 3 has a roller 4, which cooperates with a circulating belt 5 to form a nip 6. The band 5 is pressed by means of a pressure shoe 7, which has a support surface 8, against the roller 4. The roller 4 may be heated so as to pressurize the web 2 not only with the elevated pressure prevailing in the nip 6, but also with an elevated temperature. The support surface 8 may have a curvature which is adapted to the curvature of the roller 4.

Der Breitnip 6 hat eine aktive Länge von mindestens 40 mm, d.h. die Bahn 2 wird im Breitnip 6 auf einer Länge von mindestens 40 mm mit erhöhtem Druck und erhöhter Temperatur beaufschlagt.The nip 6 has an active length of at least 40 mm, i. the web 2 is applied in the nip 6 on a length of at least 40 mm with increased pressure and elevated temperature.

Das Band 5 kann der Mantel einer sogenannten Schuhwalze sein. In diesem Fall ist er relativ steif, aber elastisch genug, um sich an die Krümmung der Walze 4 anzupassen. Das Band 5 kann aber auch als flexibles Band ausgebildet sein, das, wie dargestellt, über mehrere Stützwalzen 9 im Umlauf geführt ist.The band 5 may be the jacket of a so-called shoe roll. In this case, it is relatively stiff but resilient enough to conform to the curvature of the roller 4. The band 5 can also be designed as a flexible band, which, as shown, is guided over a plurality of support rollers 9 in circulation.

Die Bahn läuft in Fig. 1 von links nach rechts. Die Bahnlaufrichtung 10 ist durch einen Pfeil markiert. In Bahnlaufrichtung vor dem Breitnip 6 ist eine Heizeinrichtung 11 angeordnet, mit der die Bahn 2 vorgetrocknet wird. Im Breitnip 6 sollte die Bahn 2 allerdings noch eine gewisse Feuchtigkeit aufweisen.The train is running in Fig. 1 left to right. The web running direction 10 is marked by an arrow. In the web running direction in front of the nip 6, a heating device 11 is arranged, with which the web 2 is pre-dried. In broad nip 6, however, web 2 should still have some moisture.

Hinter dem Breitnip 6 in Bahnlaufrichtung 10 ist eine Auftragseinrichtung 12 für einen Strich angeordnet. Die Auftragseinrichtung 12 beschichtet die Bahn 2 mit einer Beschichtung aus Leim, Stärke und/oder Pigment. Der Strich wird gelegentlich auch als Streichfarbe bezeichnet.Behind the broad nip 6 in the web running direction 10, an application device 12 is arranged for a bar. The application device 12 coats the web 2 with a coating of glue, starch and / or pigment. The stroke is sometimes referred to as a coating color.

In Bahnlaufrichtung 10 hinter der Auftragseinrichtung ist eine weitere Trocknungseinrichtung 13 vorgesehen, mit deren Hilfe die Bahn 2 getrocknet werden kann, um den Strich zu trocknen. Dementsprechend kann hinter der Trocknungseinrichtung 13 eine weitere Auftragseinrichtung 14 vorgesehen sein, in der ein weiterer Strich aufgetragen werden kann. In der Auftragseinrichtung 12 kann dementsprechend ein Vorstrich aufgetragen werden, während in der Auftragseinrichtung 14 ein Nachstrich aufgetragen wird.In the web running direction 10 behind the application device, a further drying device 13 is provided, with the aid of the web 2 can be dried to dry the line. Accordingly, behind the drying device 13, a further application device 14 may be provided, in which a further line can be applied. Accordingly, a precoat can be applied in the applicator 12, while a coat of ink is applied in the applicator 14.

Wichtig ist, daß die Auftragseinrichtung 12 als Konturstrich-Auftragseinrichtung ausgebildet ist. Bei einem Konturstrich wird die Oberfläche der Bahn nicht egalisiert, wie beispielsweise bei einem Blade-Strich. Die Streichfarbe wird also nicht durch ein Rakel oder einen Schaber glattgestrichen. Dies würde zwar eine relativ glatte Oberfläche mit sich bringen. Beim Bedrucken einer derartigen Oberfläche können sich aber Probleme ergeben, die als "Druck-Mottling" bezeichnet werden.It is important that the application device 12 is designed as a contour line application device. A contour stroke does not equalize the surface of the web, such as a blade stroke. The Coating paint is therefore not smoothed by a squeegee or scraper. Although this would bring a relatively smooth surface with it. However, when printing such a surface, problems may arise which are referred to as "print mottling".

Bei einem Konturstrich wird hingegen eine Beschichtung auf die Oberfläche der Bahn 2 aufgetragen, die eine gleichmäßige Dicke hat und der Kontur der Oberfläche der Bahn 2 folgt. Die Oberfläche des Strichs hat im Grunde die gleiche oder zumindest eine ähnliche Struktur wie die Oberfläche der Bahn 2 selbst. Dabei nimmt man zwar eine verminderte Glätte in Kauf. Die Bedruckbarkeit wird aber erheblich verbessert.In a contour stroke, however, a coating is applied to the surface of the web 2, which has a uniform thickness and the contour of the surface of the web 2 follows. The surface of the bar basically has the same or at least a similar structure to the surface of the lane 2 itself. In doing so, a reduced smoothness is accepted. The printability is significantly improved.

Im vorliegenden Fall ist die Auftragseinrichtung 12 als Walzenpresse ausgebildet mit zwei Walzen 15, 16, wobei jede Walze 15, 16 mit einer Düse 17, 18 zusammenwirkt, die einen "Film" auf die Oberfläche der Walzen 15, 16 aufträgt. Dieser Film überträgt sich dann an die Bahn 2.In the present case, the applicator 12 is formed as a roller press with two rollers 15, 16, wherein each roller 15, 16 with a nozzle 17, 18 cooperates, which applies a "film" on the surface of the rollers 15, 16. This film then transfers to the web 2.

Dargestellt ist eine Ausführungsform, bei der ein Strich beidseitig aufgebracht wird. Dies ist nicht unbedingt erforderlich. In vielen Fällen wird es auch ausreichen, einen Strich nur auf eine Seite der Bahn 2 aufzubringen.Shown is an embodiment in which a line is applied on both sides. This is not essential. In many cases it will also be sufficient to apply a line only to one side of the web 2.

Fig. 2 zeigt eine alternative Ausgestaltung der Auftragseinrichtung 12, bei der der Strich durch Sprühdüsen 19, 20 direkt auf die Oberflächen der Bahn 2 aufgetragen wird. Mit einer derartigen, auch als "Curtain Coater" bezeichneten Auftragseinrichtung 12 läßt sich im Prinzip ein idealer Konturstrich erreichen, bei dem eine Kapillarpenetration der Beschichtung in die Oberfläche der Bahn 2 erfolgt. Auch hier kann man eine Sprühdüse weglassen, wenn nur ein einseitiger Auftrag des Strichs erwünscht ist. Fig. 2 shows an alternative embodiment of the applicator 12, in which the line is applied by spray nozzles 19, 20 directly on the surfaces of the web 2. With such, also called "curtain coater" applicator 12 can be in principle, achieve an ideal contour line in which a capillary penetration of the coating takes place in the surface of the web 2. Again, you can omit a spray nozzle, if only a one-sided order of the stroke is desired.

Claims (11)

  1. Method for treating a paper or cardboard web, in which method the web is dried, a coating is applied to the web, and the web is calendered in an extended nip before the application of the coating, the coating being applied as a contour coating, characterized in that the web is dried after the coating application, and then a subsequent coating is applied.
  2. Method according to Claim 1, characterized in that the web is predried before being calendered in the extended nip.
  3. Method according to Claim 1 or 2, characterized in that a treatment length in the extended nip of at least 40 mm is used.
  4. Method according to one of Claims 1 to 3, characterized in that at least one circulating belt is used to delimit the extended nip.
  5. Method according to one of Claims 1 to 4, characterized in that a spray, free-jet or roll application is used to apply the coating.
  6. Method according to one of Claims 1 to 5, characterized in that size, starch and/or pigment is used as coating.
  7. Method according to one of Claims 1 to 6, characterized in that the coating is configured as a precoating.
  8. Apparatus for treating a paper or cardboard web having an application device for applying a coating, in front of which an extended-nip calender is arranged, the application device being configured as a contour-coating application device, characterized in that a drying device (13) and a further application device (14) are provided behind the application device (12).
  9. Apparatus according to Claim 8, characterized in that the application device (12) is configured as a spray, free-jet or roll application device.
  10. Apparatus according to Claim 8 or 9, characterized in that the extended-nip calender (3) has a treatment length of at least 40 mm.
  11. Apparatus according to one of Claims 8 to 10, characterized in that the extended-nip calender (3) has at least one circulating belt (5).
EP03025268A 2002-11-28 2003-11-06 Process and apparatus for treating a paper or cardboard Expired - Lifetime EP1433899B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10255422A DE10255422B4 (en) 2002-11-28 2002-11-28 Method and device for treating a paper or cardboard web
DE10255422 2002-11-28

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EP1433899A2 EP1433899A2 (en) 2004-06-30
EP1433899A3 EP1433899A3 (en) 2007-07-04
EP1433899B1 true EP1433899B1 (en) 2010-12-15

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Publication number Priority date Publication date Assignee Title
DE10232550C5 (en) * 2002-07-18 2013-02-07 Voith Patent Gmbh Apparatus and method for impregnating a paper or board web
DE102004003921A1 (en) * 2004-01-27 2005-11-24 Voith Paper Patent Gmbh Method and arrangement for producing a wood-free coated, matt or semi-matt paper web
DE102004029261B4 (en) † 2004-06-17 2006-05-18 Papierfabrik August Koehler Ag A process for producing a thermosensitive recording material and a recording material prepared by the process
DE102006031403A1 (en) * 2006-07-05 2008-01-10 Voith Patent Gmbh Method for processing a web of raw paper or raw cardboard
PL3342929T3 (en) * 2016-12-30 2019-05-31 Mitsubishi Hitec Paper Europe Gmbh Barrier paper

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DE4011394C1 (en) * 1990-04-09 1991-11-28 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
SE503580C2 (en) * 1995-03-16 1996-07-08 Korsnaes Ab Coated cardboard for shaped articles, production line for production of coated cardboard, method for making coated cardboard and ways to reduce the cracking propensity when folding a coated cardboard
DE19545408C5 (en) * 1995-12-06 2004-01-22 Voith Sulzer Papiermaschinen Gmbh Process for the surface finishing of a cardboard web
DE19715345A1 (en) * 1997-03-27 1998-10-01 Voith Sulzer Papiermasch Gmbh Process for producing a coated web, in particular from paper or cardboard
DE19719128A1 (en) * 1997-05-07 1998-11-12 Jagenberg Papiertech Gmbh Device for applying coating material
DE10116840A1 (en) * 2001-04-04 2002-10-17 Voith Paper Patent Gmbh Pre-dried paper web is surface-moistened and fed sandwiched between two belts to a nip for surface treatment
DE10232550C5 (en) * 2002-07-18 2013-02-07 Voith Patent Gmbh Apparatus and method for impregnating a paper or board web

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EP1433899A2 (en) 2004-06-30
DE10255422A1 (en) 2004-06-24
EP1433899A3 (en) 2007-07-04
DE50313321D1 (en) 2011-01-27
DE10255422B4 (en) 2004-10-28
ATE491843T1 (en) 2011-01-15

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