EP1811083B1 - Calendering - Google Patents

Calendering Download PDF

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Publication number
EP1811083B1
EP1811083B1 EP06124197A EP06124197A EP1811083B1 EP 1811083 B1 EP1811083 B1 EP 1811083B1 EP 06124197 A EP06124197 A EP 06124197A EP 06124197 A EP06124197 A EP 06124197A EP 1811083 B1 EP1811083 B1 EP 1811083B1
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EP
European Patent Office
Prior art keywords
heated
nip
calendering
fibrous web
calendering nip
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Expired - Fee Related
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EP06124197A
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German (de)
French (fr)
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EP1811083A1 (en
Inventor
Jörg Dr. Rheims
Ulrich Rothfuss
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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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0233—Soft rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0253—Heating or cooling the rolls; Regulating the temperature

Definitions

  • the invention relates to a method and apparatus for matting a paper, cardboard or other fibrous web in a machine for producing and / or finishing the same at the at least one side of the fibrous web provided by a coating unit with a coating and the fibrous web then by at least a heated nip is performed.
  • Coated fibrous webs are usually smoothed with soft calenders.
  • the problem is to produce a suitable for printability smoothness, without making the surface to shiny.
  • the EP-A-1571257 describes a method and an apparatus in which a paper web is provided with a line and satined in a wide nip, that is provided with gloss.
  • the WO 02/29159 refers to a method and a calender in which satined in a long nip under certain physical parameters.
  • the jacket of the unheated roll is at least partially made of metal.
  • the curl avoidance is the object of the invention in the EP-A-1491680 ,
  • countercurl generating devices are used in the immediate vicinity of a wide-nip calender.
  • the object of the invention is to improve the smoothness of matte satin.
  • the object with respect to the method is achieved in that the smoothing gap is extended and formed by a smoothing roll and a shoe press roll, the line force in the heated nip is above 300N / mm, a pressing surface of the heated nip heated to a temperature between 90 and 130 ° C.
  • the roll shell of the shoe press roll has a hardness of less than 95 shore (A) and pulp webs having a Tappi 75 gloss value of less than 35% are produced.
  • the calendering nip is extended and is formed by a smoothing roll and a shoe press roll, the line force in the heated nip is above 300 N / mm, a pressing surface of the heated nip at a temperature between 90 and 130 ° C. is heated, the surface of the roll shell of the shoe press roll has a hardness of less than 95 Shore (A) and the nip is adapted to produce fibrous webs with a Tappi 75 gloss value of less than 35%.
  • the temperature in the nip is much higher than is otherwise found in the matte finish. Surprisingly, it has been found that the higher temperature in conjunction with the longer residence time has a positive effect on the smoothness, but not on the same extent on the gloss.
  • the length of the heated nip should be between 40 and 90 mm.
  • the heated pressing surface should be formed for simplicity by a heated smoothing roll.
  • the pressing surface opposite the heated pressing surface should be designed as a roll with an elastic cover or as a shoe press roll.
  • the flexible roll shell of the shoe press roll should have a hardness of less than 95 Shore (A) at least on the surface in order to protect the fibrous web.
  • both sides of the fibrous web should be provided with a coating by the coater.
  • the heated pressing surfaces of the heated nip should be placed on different sides of the fibrous web.
  • the fibrous web runs through a heated, extended nip and an elastic smoothing nip, wherein the elastic nip is formed by two pressing surfaces, at least one of which has an elastic cover.
  • the elastic nip should be formed by two press rolls, at least one of which has an elastic cover.
  • the elastic cover also results in an extension of the calendering nip.
  • two press rolls offer the advantage that in particular the fibrous web thickness can be profiled in the elastic nip.
  • the elastic smoothing nip is arranged before or after the heated calendering nip.
  • Tappi 75 is a method for measuring the reflection gloss of the paper at 75 ° according to the test method Tappi T480.
  • the fibrous web 1 is painted on both sides during the passage of a coating unit 2 before satining. This forms the basis for a substantial improvement in surface properties.
  • the fibrous web 1 is passed through a first, heated and extended nip.
  • This smoothing gap is formed by a heated, cylindrical and below the fibrous web 1 arranged smoothing roll 4 and an upper shoe press roll 3.
  • the shoe press roll 3 has a flexible roll shell 7 which is pressed by a pressing element 8 with concave pressing surface for smoothing roll 4.
  • the roll shell 7 is sufficiently soft with a hardness of less than 95 Shore (A) to not affect the surface of the fibrous web 1.
  • the concave pressing surface extends the smoothing gap to a length between 40 and 90 mm. Because of the thus resulting, longer residence time of the fibrous web 1 in the calendering nip, the line force can be increased to values above 300 N / mm without the risk of excessive volume reduction.
  • the temperature of the roll shell of the heated smoothing roll 4 is between 90 and 130 ° C and, in conjunction with the long residence time for a significant improvement in the smoothness.
  • a second heated and extended smoothing nip In order to further improve the smoothing of the fibrous web 1, follows in the embodiment according to FIG. 1 then a second heated and extended smoothing nip.
  • the heated smoothing rolls 4 are arranged on different sides of the fibrous web 1.
  • the heated nip in the web running direction 9 is followed by an elastic nip.
  • This elastic smoothing nip is formed by two press rollers 5,6 with an elastic roll cover. Due to the elasticity of the roll covers, here too an extended smoothing gap arises.
  • This elastic smoothing gap is associated with a smoothing gap with shoe press roll with less effort.

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  • Paper (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

A paper mill has a matt satin-finisher assembly in which a surface-coating agent is applied to one side of the moving web prior to passage through a heated glazing gap. The glazing gap is longer than prior art. The linear forces in the heated glazing gap are above 300 N/mm, and the press surface temperature in the glazing gap is between 90 and 130C. The length of each glazing gap is 40 - 90 mm and the assembly has two heated glazing stations, one acting on each side of the paper web. Also claimed is a commensurate process in which the web feeds through a heated glazing gap, and an elastic glazing gap formed by two press surfaces of which one or both are elastic. The elastic gap is located prior to or after the heated glazing gap.

Description

Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zum Mattsatinieren einer Papier-, Karton- oder einer anderen Faserstoffbahn in einer Maschine zur Herstellung und/oder Veredlung derselben bei dem zumindest eine Seite der Faserstoffbahn von einem Streichaggregat mit einer Beschichtung versehen und die Faserstoffbahn anschließend durch wenigstens einen beheizten Glättspalt geführt wird.The invention relates to a method and apparatus for matting a paper, cardboard or other fibrous web in a machine for producing and / or finishing the same at the at least one side of the fibrous web provided by a coating unit with a coating and the fibrous web then by at least a heated nip is performed.

Gestrichene Faserstoffbahnen werden üblicherweise mit Softkalandern geglättet. Dabei besteht das Problem darin, eine für die Bedruckbarkeit geeignete Glätte herzustellen, ohne die Oberfläche zu glänzend zu machen.Coated fibrous webs are usually smoothed with soft calenders. The problem is to produce a suitable for printability smoothness, without making the surface to shiny.

Dies kann bisher noch nicht in ausreichendem Maße erreicht werden.This can not yet be achieved to a sufficient extent.

Die EP-A-1571257 beschreibt ein Verfahren und eine Vorrichtung, bei denen eine Papierbahn mit einem Strich versehen wird und in einem Breitnip satiniert, also mit Glanz versehen wird.The EP-A-1571257 describes a method and an apparatus in which a paper web is provided with a line and satined in a wide nip, that is provided with gloss.

Die WO 02/29159 bezieht sich auf ein Verfahren und einen Kalander, bei denen in einem langen Nip unter bestimmten physikalischen Parametern satiniert wird. Der Mantel der unbeheizten Walze ist zumindest teilweise aus Metall gefertigt.The WO 02/29159 refers to a method and a calender in which satined in a long nip under certain physical parameters. The jacket of the unheated roll is at least partially made of metal.

Die Curlvermeidung ist die Aufgabe der Erfindung in der EP-A-1491680 . Dazu sind in unmittelbarer Nachbarschaft zu einem Breitnipkalander Gegencurl-Erzeugungseinrichtungen eingesetzt.The curl avoidance is the object of the invention in the EP-A-1491680 , For this purpose, countercurl generating devices are used in the immediate vicinity of a wide-nip calender.

Die EP-A-1467019 veröfftenlicht eine Streicheinrichtung hinter einem Breitnipkalander.The EP-A-1467019 Published a coating device behind a Breitnipkalander.

Die Aufgabe der Erfindung ist es, die Glätte beim Mattsatinieren zu verbessern.The object of the invention is to improve the smoothness of matte satin.

Erfindungsgemäß wird die Aufgabe bezüglich des Verfahrens dadurch gelöst, dass der Glättspalt verlängert und von einer Glättwalze und einer Schuhpresswalze gebildet ist, die Linienkraft im beheizten Glättspalt über 300N/mm liegt, eine Pressfläche des beheizten Glättspaltes auf eine Temperatur zwischen 90 und 130°C erwärmt wird, der Walzenmantel der Schuhpresswalze eine Härte von weniger als 95 Shore (A) hat und Faserstoffbahnen mit einem Tappi 75 Glanzwert von unter 35% erzeugt werden.
Die Aufgabe wird bezüglich der Vorrichtung dadurch gelöst, dass der Glättspalt verlängert ist und von einer Glättwalze und einer Schuhpresswalze gebildet ist, die Linienkraft im beheizten Glättspalt über 300 N/mm liegt, eine Pressfläche des beheizten Glättspaltes auf eine Temperatur zwischen 90 und 130°C erwärmt wird, die Oberfläche des Walzenmantels der Schuhpresswalze eine Härte von weniger als 95 Shore (A) hat und der Glättspalt geeignet ist, Faserstoffbahnen mit einem Tappi 75 Glanzwert von unter 35% zu erzeugen.According to the invention, the object with respect to the method is achieved in that the smoothing gap is extended and formed by a smoothing roll and a shoe press roll, the line force in the heated nip is above 300N / mm, a pressing surface of the heated nip heated to a temperature between 90 and 130 ° C. the roll shell of the shoe press roll has a hardness of less than 95 shore (A) and pulp webs having a Tappi 75 gloss value of less than 35% are produced.
The object is achieved with respect to the device in that the calendering nip is extended and is formed by a smoothing roll and a shoe press roll, the line force in the heated nip is above 300 N / mm, a pressing surface of the heated nip at a temperature between 90 and 130 ° C. is heated, the surface of the roll shell of the shoe press roll has a hardness of less than 95 Shore (A) and the nip is adapted to produce fibrous webs with a Tappi 75 gloss value of less than 35%.

Die Beanspruchung der Faserstoffbahn infolge der für das Mattsatinieren unüblich hohen Linienkraft relativiert sich wegen der verlängerten Ausführung des Glättspaltes.The stress on the fibrous web due to the unusually high line force for matting satinizes itself due to the extended design of the smoothing nip.

Damit ist auch keine zu starke Verminderung des Volumens während der Mattsatinage zu befürchten. Jedoch verbessert sich durch die längere Verweilzeit der Faserstoffbahn im Glättspalt die Glätte erheblich.This is not to fear too much reduction of the volume during the matte finish. However, the smoothness improves significantly due to the longer residence time of the fibrous web in the nip.

Auch die Temperatur im Glättspalt ist wesentlich höher, als dies bei der Mattsatinage ansonsten anzutreffen ist. Überraschenderweise hat sich herausgestellt, dass die höhere Temperatur in Verbindung mit der längeren Verweilzeit sich positiv auf die Glätte, aber nicht im selben Umfang auf den Glanz auswirkt.Also, the temperature in the nip is much higher than is otherwise found in the matte finish. Surprisingly, it has been found that the higher temperature in conjunction with the longer residence time has a positive effect on the smoothness, but not on the same extent on the gloss.

Um eine ausreichende Verweilzeit insbesondere bei hohen Maschinengeschwindigkeiten gewährleisten zu können, sollte die Länge des beheizten Glättspaltes zwischen 40 und 90 mm liegen.In order to ensure a sufficient residence time, especially at high machine speeds, the length of the heated nip should be between 40 and 90 mm.

Die beheizte Pressfläche sollte der Einfachheit von einer beheizten Glättwalze gebildet werden.The heated pressing surface should be formed for simplicity by a heated smoothing roll.

Zur Gestaltung eines verlängerten Glättspaltes sollte die, der beheizten Pressfläche gegenüberliegende Pressfläche als Walze mit einem elastischen Bezug oder aber als Schuhpresswalze ausgebildet sein.To design an elongated smoothing nip, the pressing surface opposite the heated pressing surface should be designed as a roll with an elastic cover or as a shoe press roll.

Dabei sollte der flexible Walzenmantel der Schuhpresswalze zur Schonung der Faserstoffbahn zumindest an der Oberfläche eine Härte von weniger als 95 Shore (A) aufweisen.The flexible roll shell of the shoe press roll should have a hardness of less than 95 Shore (A) at least on the surface in order to protect the fibrous web.

Um die Zweiseitigkeit der Faserstoffbahn zu minimieren, sollten beide Seiten der Faserstoffbahn vom Streichaggregat mit einer Beschichtung versehen werden.To minimize the two-sidedness of the fibrous web, both sides of the fibrous web should be provided with a coating by the coater.

Zur Vervollkommnung der Mattsatinage ist es außerdem zu empfehlen, die Faserstoffbahn durch wenigstens zwei Glättspalte zu führen.To perfect the matte coating, it is also recommended to guide the fibrous web through at least two smoothing nips.

Falls dies zwei beheizte und verlängerte Glättspalte sind, so sollten die beheizten Pressflächen der beheizten Glättspalte auf verschiedenen Seiten der Faserstoffbahn angeordnet werden.If these are two heated and extended smoothing nips, the heated pressing surfaces of the heated nip should be placed on different sides of the fibrous web.

Nur so kann sich die erhöhte Temperatur der entsprechenden Pressfläche im Ergebnis auf beide Seiten der Faserstoffbahn im gleichen Umfang auswirken.Only then can the increased temperature of the corresponding pressing surface, as a result, affect both sides of the fibrous web to the same extent.

Es kann jedoch auch von Vorteil sein, wenn die Faserstoffbahn durch einen beheizten, verlängerten Glättspalt und einen elastischen Glättspalt läuft, wobei der elastische Glättspalt von zwei Pressflächen gebildet wird, von denen wenigstens eine einen elastischen Bezug besitzt.However, it may also be advantageous if the fibrous web runs through a heated, extended nip and an elastic smoothing nip, wherein the elastic nip is formed by two pressing surfaces, at least one of which has an elastic cover.

Zur Vereinfachung der Konstruktion sollte der elastische Glättspalt von zwei Presswalzen gebildet werden, von denen wenigstens eine einen elastischen Bezug besitzt. Durch den elastischen Bezug ergibt sich ebenfalls eine Verlängerung des Glättspaltes.For ease of construction, the elastic nip should be formed by two press rolls, at least one of which has an elastic cover. The elastic cover also results in an extension of the calendering nip.

Zwei Presswalzen bieten zudem den Vorteil, dass im elastischen Glättspalt vor allem die Faserstoffbahndicke profiliert werden kann.In addition, two press rolls offer the advantage that in particular the fibrous web thickness can be profiled in the elastic nip.

Je nach Art der Faserstoffbahn und den Anforderungen an diese kann es vorteilhaft sein, wenn der elastische Glättspalt vor oder nach dem beheizten Glättspalt angeordnet ist.Depending on the type of fibrous web and the requirements of these, it may be advantageous if the elastic smoothing nip is arranged before or after the heated calendering nip.

Als matt betrachten wir hier Faserstoffbahnen, insbesondere Papierbahnen mit einem Tappi 75 Glanzwert von unter 35%. Dabei ist Tappi 75 eine Methode zur Messung des Reflektionsglanzes des Papiers bei 75° gemäß der Testmethode Tappi T480.Here we consider as pulp fibrous webs, in particular paper webs with a Tappi 75 gloss value of less than 35%. Tappi 75 is a method for measuring the reflection gloss of the paper at 75 ° according to the test method Tappi T480.

Nachfolgend soll die Erfindung an zwei Ausführungsbeispielen näher erläutert werden. In der beigefügten Zeichnung zeigt:

Figur 1:
eine Vorrichtung mit zwei verlängerten, beheizten Glättspalten und
Figur 2:
mit nur einem verlängerten und beheizten Glättspalt zur Herstellung einer matten Faserstoffbahn 1, insbesondere Papierbahn.
The invention will be explained in more detail below with reference to two exemplary embodiments. In the attached drawing shows:
FIG. 1:
a device with two extended heated nips and
FIG. 2:
with only one extended and heated nip for producing a matt fibrous web 1, in particular paper web.

In beiden Fällen wird die Faserstoffbahn 1 vor dem Satinieren beidseitig während des Durchlaufens eines Streichaggregates 2 gestrichen. Dies bildet die Grundlage für eine wesentliche Verbesserung der Oberflächeneigenschaften.In both cases, the fibrous web 1 is painted on both sides during the passage of a coating unit 2 before satining. This forms the basis for a substantial improvement in surface properties.

Anschließend wird die Faserstoffbahn 1 durch einen ersten, beheizten und verlängerten Glättspalt geführt. Dieser Glättspalt wird von einer beheizten, zylindrischen und unterhalb der Faserstoffbahn 1 angeordneten Glättwalze 4 und einer oberen Schuhpresswalze 3 gebildet.Subsequently, the fibrous web 1 is passed through a first, heated and extended nip. This smoothing gap is formed by a heated, cylindrical and below the fibrous web 1 arranged smoothing roll 4 and an upper shoe press roll 3.

Die Schuhpresswalze 3 besitzt einen flexiblen Walzenmantel 7 der von einem Anpresselement 8 mit konkaver Pressfläche zur Glättwalze 4 gedrückt wird. Der Walzenmantel 7 ist mit einer Härte von weniger als 95 Shore (A) ausreichend weich um die Oberfläche der Faserstoffbahn 1 nicht zu beeinträchtigen.The shoe press roll 3 has a flexible roll shell 7 which is pressed by a pressing element 8 with concave pressing surface for smoothing roll 4. The roll shell 7 is sufficiently soft with a hardness of less than 95 Shore (A) to not affect the surface of the fibrous web 1.

Über die konkave Pressfläche wird der Glättspalt auf eine Länge zwischen 40 und 90 mm verlängert. Wegen der sich hierdurch ergebenden, längeren Verweilzeit der Faserstoffbahn 1 im Glättspalt kann die Linienkraft ohne die Gefahr einer zu starken Volumenverminderung auf Werte oberhalb von 300 N/mm erhöht werden.The concave pressing surface extends the smoothing gap to a length between 40 and 90 mm. Because of the thus resulting, longer residence time of the fibrous web 1 in the calendering nip, the line force can be increased to values above 300 N / mm without the risk of excessive volume reduction.

Die Temperatur des Walzenmantels der beheizten Glättwalze 4 liegt zwischen 90 und 130 °C und sorgt in Verbindung mit der langen Verweilzeit für eine wesentliche Verbesserung der Glätte.The temperature of the roll shell of the heated smoothing roll 4 is between 90 and 130 ° C and, in conjunction with the long residence time for a significant improvement in the smoothness.

Um die Glättung der Faserstoffbahn 1 noch weiter zu verbessern, folgt bei der Ausführung gemäß Figur 1 hierauf ein zweiter beheizter und verlängerter Glättspalt. Im Interesse einer minimierten Zweiseitigkeit der Faserstoffbahn 1 sind die beheizten Glättwalzen 4 auf unterschiedlichen Seiten der Faserstoffbahn 1 angeordnet.In order to further improve the smoothing of the fibrous web 1, follows in the embodiment according to FIG. 1 then a second heated and extended smoothing nip. In the interest of a minimized two-sidedness of the fibrous web 1, the heated smoothing rolls 4 are arranged on different sides of the fibrous web 1.

Bei der in Figur 2 gezeigten Ausführung folgt dem beheizten Glättspalt in Bahnlaufrichtung 9 ein elastischer Glättspalt.At the in FIG. 2 As shown, the heated nip in the web running direction 9 is followed by an elastic nip.

Dieser elastische Glättspalt wird von zwei Presswalzen 5,6 mit einem elastischen Walzenbezug gebildet. Durch die Elastizität der Walzenbezüge stellt sich auch hier ein verlängerter Glättspalt ein.This elastic smoothing nip is formed by two press rollers 5,6 with an elastic roll cover. Due to the elasticity of the roll covers, here too an extended smoothing gap arises.

Dieser elastische Glättspalt ist gegenüber einem Glättspalt mit Schuhpresswalze mit geringerem Aufwand verbunden.This elastic smoothing gap is associated with a smoothing gap with shoe press roll with less effort.

Die sich hierdurch ergebende Verbesserung der Glätte ist für viele Anwendungen bereits ausreichend. Außerdem vermindert sich durch die gleichseitige Behandlung eine eventuell vorhandene Zweiseitigkeit der Faserstoffbahn 1.The resulting improvement in smoothness is already sufficient for many applications. In addition, the equilateral treatment reduces any two-sidedness of the fibrous web 1.

In beiden Fällen kann es vorteilhaft sein, die Faserstoffbahn 1 insbesondere vor dem beheizten und verlängerten Glättspalt zu befeuchten, um den Feuchteverlust beim Glättprozess zumindest teilweise wieder auszugleichen.In both cases, it may be advantageous to moisten the fibrous web 1, in particular before the heated and extended nip, in order to at least partially compensate for the loss of moisture in the smoothing process.

Claims (16)

  1. Method for the matt calendering of a paper, board or another fibrous web (1) in a machine for producing and/or finishing the same, in which at least one side of the fibrous web (1) is provided with a coating by a coating unit (2) and the fibrous web (1) is then led through at least one heated calendering nip,
    characterized in that
    the calendering nip is extended and is formed by a calendering roll (4) and a shoe press roll (3), the line force in the heated calendering nip is more than 300 N/mm, a pressing surface of the heated calendering nip is heated to a temperature between 90 and 130°C, the roll shell (7) of the shoe press roll (3) has a hardness of less than 95 Shore (A), and fibrous webs having a Tappi 75 gloss value of less than 35% are produced.
  2. Method according to Claim 1, characterized in that the length of the heated calendering nip is between 40 and 90 mm.
  3. Method according to Claim 1 or 2, characterized in that the fibrous web (1) is led through two heated calendering nips.
  4. Method according to Claim 3, characterized in that the heated pressing surfaces of the heated calendering nips are arranged on different sides of the fibrous web (1).
  5. Method according to Claim 1 or 2, characterized in that the fibrous web (1) runs through a heated calendering nip and a resilient calendering nip, the resilient calendering nip being formed by two pressing surfaces, of which at least one has a resilient cover.
  6. Method according to Claim 5, characterized in that the resilient calendering nip is arranged before the heated calendering nip.
  7. Method according to Claim 5, characterized in that the resilient calendering nip is arranged after the heated calendering nip.
  8. Method according to one of the preceding claims, characterized in that both sides of the fibrous web (1) are provided with a coating by the coating unit (2).
  9. Apparatus for the matt calendering of a paper, board or another fibrous web (1) in a machine for producing and/or finishing the same, in which at least one side of the fibrous web (1) is provided with a coating by a coating unit (2) and the fibrous web (1) is then led through at least one heated calendering nip, in particular for carrying out the method according to one of the preceding claims, characterized in that
    the calendering nip is extended and is formed by a calendering roll (4) and a shoe press roll (3), the line force in the heated calendering nip is more than 300 N/mm, a pressing surface of the heated calendering nip is heated to a temperature between 90 and 130°C, the surface of the roll shell (7) of the shoe press roll (3) has a hardness of less than 95 Shore (A), and the calendering nip is suitable for producing fibrous webs having a Tappi 75 gloss value of less than 35%.
  10. Apparatus according to Claim 9, characterized in that the heated pressing surface is formed by a heated calendering roll (4).
  11. Apparatus according to one of Claims 9 to 10, characterized in that the length of the heated calendering nip is between 40 and 90 mm.
  12. Apparatus according to one of Claims 9 to 11, characterized in that the fibrous web (1) is led through two heated calendering nips.
  13. Apparatus according to Claim 12, characterized in that the heated pressing surfaces of the heated calendering nips are arranged on different sides of the fibrous web (1).
  14. Method according to one of Claims 9 to 12, characterized in that the fibrous web (1) runs through a heated calendering nip and a resilient calendering nip, the resilient calendering nip being formed by two pressing rolls (5, 6), of which at least one has a resilient cover.
  15. Apparatus according to Claim 14, characterized in that the resilient calendering nip is arranged before the heated calendering nip.
  16. Apparatus according to Claim 14, characterized in that the resilient calendering nip is arranged after the heated calendering nip.
EP06124197A 2006-01-07 2006-11-16 Calendering Expired - Fee Related EP1811083B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006001021A DE102006001021A1 (en) 2006-01-07 2006-01-07 Paper mill matt-satin finisher for paper or cardboard has extended heating smoothing gap

Publications (2)

Publication Number Publication Date
EP1811083A1 EP1811083A1 (en) 2007-07-25
EP1811083B1 true EP1811083B1 (en) 2008-11-19

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EP (1) EP1811083B1 (en)
JP (1) JP4906500B2 (en)
AT (1) ATE414818T1 (en)
DE (2) DE102006001021A1 (en)

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DE102009029482A1 (en) * 2009-09-15 2011-03-24 Voith Patent Gmbh Device for treating a fibrous web

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FI991108A (en) * 1999-05-14 2000-11-15 Valmet Corp Method and apparatus for the manufacture of calendered paper or calendered paperboard
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EP1811083A1 (en) 2007-07-25
DE502006002116D1 (en) 2009-01-02
JP2007182666A (en) 2007-07-19
DE102006001021A1 (en) 2007-07-12
ATE414818T1 (en) 2008-12-15
JP4906500B2 (en) 2012-03-28

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