EP1467020B1 - Method for treating a cardboard web - Google Patents

Method for treating a cardboard web Download PDF

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Publication number
EP1467020B1
EP1467020B1 EP04101459A EP04101459A EP1467020B1 EP 1467020 B1 EP1467020 B1 EP 1467020B1 EP 04101459 A EP04101459 A EP 04101459A EP 04101459 A EP04101459 A EP 04101459A EP 1467020 B1 EP1467020 B1 EP 1467020B1
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EP
European Patent Office
Prior art keywords
web
nip
carton
coating
board
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EP04101459A
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German (de)
French (fr)
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EP1467020A1 (en
Inventor
Rüdiger Dr. Kurtz
Jörg Dr. Rheims
Helmut Endler
Hermann Dr. Solbach
Stefan Seidenath
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Voith Patent GmbH
Stora Enso Publication Paper GmbH and Co KG
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Voith Patent GmbH
Stora Enso Publication Paper GmbH and Co KG
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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
    • 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
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Definitions

  • the invention relates to a method for treating a board web, which is passed through a wide nip and then provided with at least one coating order, wherein the web is pre-calendered in the nip to a maximum micro-roughness of 6 microns (PPS-S10).
  • WO 02/103109 A1 there is disclosed a method of making a once-coated printing paper web.
  • the web is made in a paper machine, passed through a dryer section and then satined in a pre-calender.
  • the pre-calender can be designed as a two-nip calender with two wide nips, so that both sides of the web can be treated with a heating roller. Pre-calendering gives the web micro-roughness of less than 6 ⁇ m.
  • the web is passed through a coater. D1 can not be deduced to recalender the web after the precalendering in the nip and before the first coat application in at least one nip formed between two rolls.
  • WO 01/98585 A1 discloses a method for calendering a paper web, wherein the paper web first is precalendered and then provided with a stroke order.
  • two calender units are provided, each with a heatable roller and a soft roller.
  • the two calender units are arranged one behind the other in such a way that both sides of the web can be treated with the heating roller.
  • the treatment of a board web in a nip before applying a line is intended to improve the printability of the web.
  • the board web is often smoothed at relatively high volume, at high temperatures above the T G (glass transition temperature).
  • T G glass transition temperature
  • the invention has for its object to improve the printability of the web.
  • the object is achieved in a method of the type mentioned above in that the web is nachkalandriert between the nip and the first coating order in at least one nip formed between a hard roller and an elastic pad having soft roller or between two hard rollers ,
  • the board web is moistened in front of the broad nip.
  • the moistening can be effected by means known per se, for example a steam humidifier, a nozzle moistener or the like. Moistening should be as close as possible to the wide nip.
  • the board web is heated in the nip to a temperature of at least 100 ° C.
  • This side can also be heated more strongly, for example to at least 200 ° C.
  • the advantageous result is obtained that the moisture in vapor form can uniformly spread in the web due to the broad nip as a closed system. The steam will be evenly distributed so that everywhere the same pressure prevails. If the train then leaves the nip and the moisture can condense again, the moisture distribution has been made uniform.
  • the blanket of the paperboard web is adjusted by bulk sizing in front of the nip so that it has a COBB liquid absorption capacity of a maximum of 50 g of water / m 2 over a period of 60 s over a surface area of 100 cm 2 .
  • the area of 100 cm 2 usually has a circular shape when measured according to COBB according to EN 20535. If you glue the ceiling of the board so that it has the said liquid absorbency, then creates favorable conditions in the order of the stroke. The stroke remains on the surface and can form there very evenly.
  • the glue is added before the headbox, so relatively early, as so-called mass sizing in the liquid state of the fiber suspension. Due to the long residence time, the glue can be applied to the fiber material and spread sufficiently in the cardboard layer. It is preferable to apply a coating color having a total mass of at least 15 g / m 2 . This later improves the printability. In the case of a multiple stroke, this information applies to the sum of all layers, that is the overall line.
  • a coating color having a water retention capacity of at least 50 s, in particular in the range of 50 to 80 s is used.
  • This water retention capacity is measured according to the subscription test method, defined eg in Sandas, Salminen, Eklund: Measurement of water retention coating colors, 1989 TAPPI Coating Conference, Proceedings 37-41.
  • Such a coating contains binders and pigments. It is particularly well suited for folding boxboard, which should be printed over the entire surface.
  • the nip is formed as a soft nip between a hard roll and an elastic pad having a soft roll.
  • practically only the macro roughness is improved in the soft nip.
  • only one-sided smoothing takes place here. But this is sufficient in many cases, especially in carton box, which should be printed on one side anyway.
  • the back can be relatively rough.
  • the nip is formed as a hard nip between two hard rolls. In this case, the smoothness on both sides of the web is improved.
  • the hard nip can be used as a calibration nip so that the web has a relatively uniform thickness across its width.
  • the recalendering is carried out with a line load in the range of 10 to 30 N / mm.
  • the line load is thus optimized so that the volume loss remains small, but the desired smoothness can be achieved.
  • the figure shows a device 1 for treating a board web 2, which will also be referred to as "web" for short.
  • a blanket of the board web is produced and provided with glue by a glue metering station 4 which is arranged in the constant part of the board machine in front of the headbox.
  • the sizing of the blanket eg with a resin dispersion, is adjusted so that the blanket has a liquid absorbency, which is determined by COBB and a maximum of 50 g water / m 2 in a time of 60 s on a circular area of 100 cm 2 having.
  • the thus treated web 2 is passed after the predrying through a nip 5, which is formed between a hard roller 6 with a smooth surface 7 and a circumferential jacket 8 of a shoe roll 9.
  • the jacket 8 is pressed by a support shoe 10 against the roller 6.
  • the support shoe 10 has a pressure surface 11, which may be provided in a manner not shown with means for lubricating the contact surface between the jacket 8 and the Stutzschuh 10, for example, a hydrostatic lubrication.
  • the shoe roll 9 is formed with a relatively stable shell 8, which rotates in the manner of a roller. Support elements that support the jacket 8 during circulation, are not shown in detail.
  • the broad nip 5 may also be formed in other ways. Instead of the illustrated Mantels can also be used simply a band that rotates over several pulleys. Instead of the roller 6, it is also possible to use another counterpressure element, for example a further strip which is supported by a pressure shoe.
  • the roller 6 may have heating channels 12, through which a heat transfer medium, such as steam or hot oil, can be passed to heat the web 2 in the extended nip 5 on the later coated and printed side to a temperature of at least 100 ° C.
  • a heat transfer medium such as steam or hot oil
  • other heating devices may also be provided instead of the heating channels, for example a heating device 13 which acts inductively on the surface 7 of the roller 6 from inside or from outside.
  • a moistening device 14 is arranged, for example a steam humidifier, a nozzle moistener or the like.
  • a layer near the surface should be penetrated by the water, in order to effect a volume-gentle smoothing (moisture gradient calendering).
  • micro-smoothness is determined according to PPS-S10.
  • the moistening device applies an application amount of, for example, 1 to 5 g / m 2 to the web 2.
  • the originating from the predrying of the board machine 3 The track does not have to be too dry yet.
  • the moistening device 14 Before the moisture application by the moistening device 14, for example, it can have a maximum web moisture content of 14%.
  • the web 2 After passing through the broad nip 5, the web 2 is guided by a further nip 15, which is formed in the present embodiment as a soft nip.
  • the soft nip 15 is formed between a hard roller 16 and a soft roller 17 having an elastic surface covering 18.
  • nip may also be provided a hard nip, in which the nip is formed by two hard rollers.
  • the compressive stresses in the nip 5 and nip 15 should be selected according to the following criteria. On the one hand, you want to achieve a volume-smoothing. On the other hand, the necessary compaction is to be effected, which results in an improved printability. In the broad nip 5, the compressive stresses are set to a maximum of 3 N / mm 2 .
  • the nip 15 should have a maximum line load of 60 N / mm, preferably only a maximum of 20 to 30 N / mm.
  • the web 2 After passing through the nip 15, the web 2 is fed to one or more coating applicators 19 (only one shown), in which the web 2 is guided, for example, by an applicator nip 20 between two applicator rollers 21, 22.
  • Each applicator roll 21, 22 is provided with an applicator 23, 24 which applies a coating color to the surface of the applicator rolls 21, 22 applies. If then the web 2 passes through theinstantnip 20, this coating color is transferred to the web 2.
  • One or more top and / or backsheet jobs are possible.
  • the coating color is applied with a mass of at least 15 g / m 2 .
  • the water retention capacity of the coating should be at least 75 s.
  • the coating color may contain binders and pigments.
  • Such a treated board web 2 is particularly well suited for offset printing.

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  • Paper (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

In a process to modify the print characteristics of a carton web, the web (2) is calandered in a wide nip (5) to a micro-roughness of no more than 6 m. The web is subject to a further calander process between the wide nip and first-stage coating process (19). The carton web is moistened prior to the wide nip (5). While passing through the wide nip the carton is heated to at lease 100C. Prior to the wide nip a bonding agent is applied to the carton web surface, bringing the carton COBB liquid absorption capacity to no more than 50 g H2O/m in a period of 60 s on a surface area of 100 cm. The bonding agent is applied in a continuous process. The carton is subsequently coated using ink or dye of 15 g/m or more and having a water retention value of 50 to 80 s. The nip (15) is formed by the interface between a hard surface and a soft surface.

Description

Die Erfindung betrifft ein Verfahren zum Behandeln einer Kartonbahn, die durch einen Breitnip geführt und danach mit mindestens einem Strichauftrag versehen wird, wobei die Bahn im Breitnip auf eine Mikrorauhigkeit von maximal 6 µm (PPS-S10) vorkalandriert wird.The invention relates to a method for treating a board web, which is passed through a wide nip and then provided with at least one coating order, wherein the web is pre-calendered in the nip to a maximum micro-roughness of 6 microns (PPS-S10).

Ein Verfahren, bei dem eine Kartonbahn durch einen Breitnip geführt und danach mit Streichfarbe versehen wird, ist aus WO 02/00998 A2 bekannt.A method in which a board web is passed through a wide nip and then provided with coating color, is out WO 02/00998 A2 known.

In WO 02/103109 A1 ist ein Verfahren zum Herstellen einer einmal gestrichenen Druckpapier-Bahn offenbart. Die Bahn wird in einer Papiermaschine hergestellt, durch eine Trockenpartie geleitet und dann in einem Vorkalander satiniert. Der Vorkalander kann als Zwei-Nip-Kalander mit zwei Breitnips ausgebildet sein, so dass beide Seiten der Bahn mit einer Heizwalze behandelt werden können. Durch das Vorkalandrieren erhält die Bahn eine Mikrorauhigkeit von weniger als 6 µm. Nach dem Vorkalandrieren im Breitnip wird die Bahn durch eine Streicheinrichtung geführt. D1 ist nicht zu entnehmen, die Bahn nach dem Vorkalandrieren im Breitnip und vor dem ersten Strichauftrag in mindestens einem zwischen zwei Walzen gebildeten Nip nachzukalandrieren.In WO 02/103109 A1 there is disclosed a method of making a once-coated printing paper web. The web is made in a paper machine, passed through a dryer section and then satined in a pre-calender. The pre-calender can be designed as a two-nip calender with two wide nips, so that both sides of the web can be treated with a heating roller. Pre-calendering gives the web micro-roughness of less than 6 μm. After precalendering in the nip, the web is passed through a coater. D1 can not be deduced to recalender the web after the precalendering in the nip and before the first coat application in at least one nip formed between two rolls.

In WO 01/98585 A1 ist ein Verfahren zum Kalandern einer Papierbahn offenbart, wobei die Papierbahn zunächst vorkalandriert wird und anschließend mit einem Strichauftrag versehen wird. Zum Vorkalandern sind zwei Kalandereinheiten mit jeweils einer beheizbaren Walze und einer weichen Walze vorgesehen. Die beiden Kalandereinheiten sind dabei derart hintereinander angeordnet, dass beide Seiten der Bahn mit der Heizwalze behandelt werden können.In WO 01/98585 A1 discloses a method for calendering a paper web, wherein the paper web first is precalendered and then provided with a stroke order. For pre-calendering two calender units are provided, each with a heatable roller and a soft roller. The two calender units are arranged one behind the other in such a way that both sides of the web can be treated with the heating roller.

Die Behandlung einer Kartonbahn in einem Breitnip vor dem Auftragen eines Strichs soll die Bedruckbarkeit der Bahn verbessern. Im Breitnip wird die Kartonbahn relativ volumenschonend häufig bei hohen Temperaturen oberhalb des TG (Glasübergangstemperatur) geglättet. Dabei erfolgt eine Konturglättung, d.h. es wird bevorzugt die Mikrorauhigkeit verbessert, die in der Regel mit dem sogenannten PPS-Verfahren gemäß ISO 8791/4 ermittelt wird.The treatment of a board web in a nip before applying a line is intended to improve the printability of the web. In the broad nip, the board web is often smoothed at relatively high volume, at high temperatures above the T G (glass transition temperature). In this case, there is a contour smoothing, ie it is preferred that the micro-roughness is improved, which is usually determined by the so-called PPS method according to ISO 8791/4.

Man kann nun beobachten, daß trotz einer an und für sich zufriedenstellenden Mikrorauhigkeit beim Drucken einer derart behandelten Kartonbahn, vor allem beim Offset-Druck, ein Druck-Mottling auftritt, d.h. die Bahn nimmt die Druckfarbe nicht gleichmäßig genug an, so daß sich ein unruhiges Erscheinungsbild ergibt. Man nimmt an, daß bei so geglätteten Kartonbahnen ein ungleichmäßiges Rückrauhen der Oberfläche nach dem Streichen auftritt und/oder die Penetration der Streichfarbe nicht gleichmäßig genug ist.It can now be observed that despite satisfactory micro-roughness in itself when printing such a treated board web, especially in offset printing, a print mottling occurs, ie the web does not accept the ink uniformly enough, so that a restless Appearance results. It is believed that with so-smoothed board webs, uneven roughening of the surface after brushing occurs and / or the penetration of the coating color is not uniform enough.

Man hat daher vereinzelt hinter der Strich-Auftragseinrichtung eine Nachglättung vorgenommen. Auch diese Vorgehensweise ist jedoch nicht immer befriedigend. Zum einen muß man abwarten, bis der Strich getrocknet ist. Zum anderen führt die Verwendung eines harten Nips zum Nachglätten zu einem Volumenverlust, was insbesondere bei der Behandlung von Kartonbahnen unerwünscht ist. Darüber hinaus führt die Glättung im harten Nip zu einem ungleichmäßigen Oberflächenbild, was möglicherweise auf eine ungleichförmige Faserverdichtung zurückzuführen ist.It has therefore occasionally made behind the line applicator smoldering. However, this procedure is not always satisfactory. For one thing, you have to wait until the line has dried. On the other hand, the use of a hard nip for after-smoothing leads to a loss of volume, which is undesirable in particular in the treatment of cardboard webs. In addition, smoothing in the hard nip results in an uneven surface image, possibly due to nonuniform fiber compaction.

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

Die Aufgabe wird bei einem Verfahren der eingangs genannten Art dadurch gelöst, dass die Bahn zwischen dem Breitnip und dem ersten Strichauftrag in mindestens einem Nip nachkalandriert wird, der zwischen einer harten Walze und einer einen elastischen Belag aufweisenden weichen Walze oder zwischen zwei harten Walzen ausgebildet ist.The object is achieved in a method of the type mentioned above in that the web is nachkalandriert between the nip and the first coating order in at least one nip formed between a hard roller and an elastic pad having soft roller or between two hard rollers ,

Durch diese Behandlung erhält man eine Oberflächenqualität der Kartonbahn, die beim Strichauftrag die Rückrauhigkeit vergleichmäßigt, so daß sie auch bei einem späteren Druckvorgang die Druckfarbe gleichmäßiger annimmt. Erreicht wird dies mit einer relativ einfachen Maßnahme, nämlich dadurch, daß die Bahn zwischen dem Breitnip und der Auftragseinrichtung für die Streichfarbe sozusagen zwischensatiniert wird. Man geht davon aus, daß der Breitnip hauptsächlich für die Mikrorauhigkeit zuständig ist und diese verbessert, der weitere Nip hinter dem Breitnip aber für die Makrorauhigkeit, die in der Regel nach Bendtsen ermittelt wird. Möglicherweise ist die Makrorauhigkeit sowohl für die Aufnahmefähigkeit der Streichfarbe als auch für die Aufnahmefähigkeit der Druckfarbe wichtiger als die Mikrorauhigkeit. Wenn man die Makrorauhigkeit vor dem Strichauftrag vermindert, erhält man eine bessere Bedruckbarkeit.By this treatment, one obtains a surface quality of the board web, which evened out the back roughness during the coating application, so that it assumes the ink more uniformly even during a later printing process. This is achieved with a relatively simple measure, namely, that the web between the Wide nip and the applicator for the coating color is quasi-satin. You go away that the broad nip is mainly responsible for and improves the microroughness, the further nip behind the broad nip but for the macro roughness, which is usually determined according to Bendtsen. Macro roughness may be more important than microroughness for both the ink receptivity and the ink receptivity. Reducing macroroughness before painting results in better printability.

Vorzugsweise wird die Kartonbahn vor dem Breitnip befeuchtet. Damit erhält man im Breitnip eine bessere Glättebildung, d.h. eine Verringerung der Rauhigkeit. Die Befeuchtung kann dabei mit an sich bekannten Mitteln erfolgen, beispielsweise einem Dampffeuchter, einem Düsenfeuchter oder ähnlichem. Die Befeuchtung soll dabei möglichst dicht am Breitnip erfolgen.Preferably, the board web is moistened in front of the broad nip. This gives a better smoothness in the extended nip, i. a reduction in roughness. The moistening can be effected by means known per se, for example a steam humidifier, a nozzle moistener or the like. Moistening should be as close as possible to the wide nip.

Bevorzugterweise wird die Kartonbahn im Breitnip auf eine Temperatur von mindestens 100°C erhitzt. Dies gilt zumindest für die Seite, die später bedruckt werden soll. Diese Seite kann auch stärker erhitzt werden, beispielsweise auf mindestens 200°C. Dies hat zwei Vorteile. Zum einen wird die Glätte verbessert, also die Mikrorauhigkeit vermindert. Zum anderen erhält man bei einer Temperatur, die mindestens der Verdampfungstemperatur der Feuchtigkeit entspricht, das vorteilhafte Ergebnis, daß sich die Feuchtigkeit in Dampfform aufgrund des Breitnips als geschlossenen Systems in der Bahn gleichmäßig ausbreiten kann. Der Dampf wird sich gleichmäßig so verteilen, daß überall der gleiche Druck herrscht. Wenn die Bahn dann den Breitnip verläßt und die Feuchtigkeit wieder kondensieren kann, ist die Feuchtigkeitsverteilung vergleichmäßigt worden.Preferably, the board web is heated in the nip to a temperature of at least 100 ° C. This applies at least to the page that is to be printed later. This side can also be heated more strongly, for example to at least 200 ° C. This has two advantages. On the one hand, the smoothness is improved, thus reducing the microroughness. On the other hand, at a temperature at least equal to the vaporization temperature of the moisture, the advantageous result is obtained that the moisture in vapor form can uniformly spread in the web due to the broad nip as a closed system. The steam will be evenly distributed so that everywhere the same pressure prevails. If the train then leaves the nip and the moisture can condense again, the moisture distribution has been made uniform.

Vorzugsweise stellt man die Decke der Kartonbahn vor dem Breitnip durch Masseleimung so ein, daß sie eine Flüssigkeitsabsorptionsfähigkeit nach COBB von maximal 50 g Wasser/m2 in einer Zeit von 60 s auf einer Fläche von 100 cm2 aufweist. Die Fläche von 100 cm2 hat bei der Messung nach COBB gemäß EN 20535 in der Regel eine Kreisform. Wenn man die Decke der Kartonbahn so beleimt, daß sie die genannte Flüssigkeitsabsorptionsfähigkeit hat, dann schafft man günstige Bedingungen bei dem Auftrag des Strichs. Der Strich bleibt an der Oberfläche und kann sich dort sehr gleichmäßig ausbilden.Preferably, the blanket of the paperboard web is adjusted by bulk sizing in front of the nip so that it has a COBB liquid absorption capacity of a maximum of 50 g of water / m 2 over a period of 60 s over a surface area of 100 cm 2 . The area of 100 cm 2 usually has a circular shape when measured according to COBB according to EN 20535. If you glue the ceiling of the board so that it has the said liquid absorbency, then creates favorable conditions in the order of the stroke. The stroke remains on the surface and can form there very evenly.

Hierbei ist bevorzugt, daß man die Leimung im Konstantteil der Kartonmaschine vornimmt. Der Leim wird vor dem Stoffauflauf, also relativ frühzeitig, als sogenannte Masseleimung im Flüssigzustand der Fasersuspension zugegeben. Aufgrund der langen Verweilzeit kann der Leim auf das Fasermaterial aufziehen und sich in der Kartonlage in ausreichendem Maße verteilen.
Bevorzugterweise trägt man eine Streichfarbe mit einer Gesamtmasse von mindestens 15 g/m2 auf. Dies verbessert später die Bedruckbarkeit. Bei einem Mehrfachstrich gilt diese Angabe für die Summe aller Schichten, also den Gesamtstrich.It is preferred that one carries out the sizing in the constant part of the board machine. The glue is added before the headbox, so relatively early, as so-called mass sizing in the liquid state of the fiber suspension. Due to the long residence time, the glue can be applied to the fiber material and spread sufficiently in the cardboard layer.
It is preferable to apply a coating color having a total mass of at least 15 g / m 2 . This later improves the printability. In the case of a multiple stroke, this information applies to the sum of all layers, that is the overall line.

Vorzugsweise verwendet man eine Streichfarbe mit einem Wasserrückhaltevermögen von mindestens 50 s, insbesondere im Bereich von 50 bis 80 s. Gemessen wird dieses Wasserrückhaltevermögen nach dem Abo-Test-Verfahren, definiert z.B. in Sandas, Salminen, Eklund: Measurement of water retention coating colours, 1989 TAPPI Coating Conference, Proceedings 37-41. Eine derartige Streichfarbe enthält Binder und Pigmente. Sie ist insbesondere für Faltschachtelkarton gut geeignet, der vollflächig bedruckt werden soll.Preferably, a coating color having a water retention capacity of at least 50 s, in particular in the range of 50 to 80 s, is used. This water retention capacity is measured according to the subscription test method, defined eg in Sandas, Salminen, Eklund: Measurement of water retention coating colors, 1989 TAPPI Coating Conference, Proceedings 37-41. Such a coating contains binders and pigments. It is particularly well suited for folding boxboard, which should be printed over the entire surface.

Vorzugsweise ist der Nip als weicher Nip zwischen einer harten Walze und einer einen elastischen Belag aufweisenden weichen Walze ausgebildet. In diesem Fall wird in dem weichen Nip praktisch nur die Makrorauhigkeit verbessert. Hier erfolgt zwar nur eine einseitige Glättung. Dies reicht aber in vielen Fällen aus, vor allem bei Faltschachtelkarton, der ohnehin nur einseitig bedruckt werden soll. Die Rückseite kann relativ rauh bleiben.Preferably, the nip is formed as a soft nip between a hard roll and an elastic pad having a soft roll. In this case, practically only the macro roughness is improved in the soft nip. Although only one-sided smoothing takes place here. But this is sufficient in many cases, especially in carton box, which should be printed on one side anyway. The back can be relatively rough.

In einer alternativen Ausgestaltung kann vorgesehen sein, daß der Nip als harter Nip zwischen zwei harten Walzen ausgebildet ist. In diesem Fall wird die Glätte auf beiden Seiten der Bahn verbessert. Der harte Nip kann als Kalibriernip verwendet werden, so daß die Bahn über ihre Breite eine relativ gleichmäßige Dicke aufweist.In an alternative embodiment it can be provided that the nip is formed as a hard nip between two hard rolls. In this case, the smoothness on both sides of the web is improved. The hard nip can be used as a calibration nip so that the web has a relatively uniform thickness across its width.

Auch ist von Vorteil, wenn das Nachkalandrieren mit einer Streckenlast im Bereich von 10 bis 30 N/mm vorgenommen wird. Die Streckenlast ist damit dahingehend optimiert, daß der Volumenverlust klein bleibt, aber die gewünschte Glätte erzielt werden kann.It is also advantageous if the recalendering is carried out with a line load in the range of 10 to 30 N / mm. The line load is thus optimized so that the volume loss remains small, but the desired smoothness can be achieved.

Die Erfindung wird im folgenden anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit der Zeichnung näher beschrieben. Hierin zeigt die einzige Figur eine schematische Darstellung einer Anordnung zum Behandeln einer Kartonbahn.The invention will be described below with reference to a preferred embodiment in conjunction with the drawings. Herein shows the single figure is a schematic representation of an arrangement for treating a board web.

Die Figur zeigt eine Vorrichtung 1 zum Behandeln einer Kartonbahn 2, die im folgenden auch kurz als "Bahn" bezeichnet wird.The figure shows a device 1 for treating a board web 2, which will also be referred to as "web" for short.

In einer Kartonmaschine 3 wird eine Decke der Kartonbahn erzeugt und durch eine Leimdosierstation 4, die im Konstantteil der Kartonmaschine vor dem Stoffauflauf angeordnet ist, mit Leim versehen. Die Leimung der Decke, z.B. mit einer Harz-Dispersion, wird so eingestellt, daß die Decke eine Flüssigkeitsabsorptionsfähigkeit hat, die nach COBB ermittelt wird und maximal 50 g Wasser/m2 in einer Zeit von 60 s auf einer kreisförmigen Fläche von 100 cm2 aufweist. Die so behandelte Bahn 2 wird nach der Vortrocknung durch einen Breitnip 5 geleitet, der zwischen einer harten Walze 6 mit einer glatten Oberfläche 7 und einem umlaufenden Mantel 8 einer Schuhwalze 9 gebildet ist. Der Mantel 8 wird durch einen Stützschuh 10 gegen die Walze 6 gedrückt. Der Stützschuh 10 weist eine Druckfläche 11 auf, die in nicht näher dargestellter Weise mit Einrichtungen zum Schmieren der Berührungsfläche zwischen dem Mantel 8 und dem Stutzschuh 10 versehen sein kann, beispielsweise einer hydrostatischen Schmierung.In a board machine 3, a blanket of the board web is produced and provided with glue by a glue metering station 4 which is arranged in the constant part of the board machine in front of the headbox. The sizing of the blanket, eg with a resin dispersion, is adjusted so that the blanket has a liquid absorbency, which is determined by COBB and a maximum of 50 g water / m 2 in a time of 60 s on a circular area of 100 cm 2 having. The thus treated web 2 is passed after the predrying through a nip 5, which is formed between a hard roller 6 with a smooth surface 7 and a circumferential jacket 8 of a shoe roll 9. The jacket 8 is pressed by a support shoe 10 against the roller 6. The support shoe 10 has a pressure surface 11, which may be provided in a manner not shown with means for lubricating the contact surface between the jacket 8 and the Stutzschuh 10, for example, a hydrostatic lubrication.

Die Schuhwalze 9 ist mit einem relativ stabilen Mantel 8 ausgebildet, der nach Art einer Walze umläuft. Stutzelemente, die den Mantel 8 beim Umlauf stützen, sind nicht näher dargestellt. Der Breitnip 5 kann auch auf andere Weise ausgebildet sein. Anstelle des dargestellten Mantels läßt sich auch einfach ein Band verwenden, das über mehrere Umlenkrollen umläuft. Anstelle der Walze 6 läßt sich auch ein anderes Gegendruckelement verwenden, beispielsweise ein weiteres Band, das durch einen Anpreßschuh unterstützt wird.The shoe roll 9 is formed with a relatively stable shell 8, which rotates in the manner of a roller. Support elements that support the jacket 8 during circulation, are not shown in detail. The broad nip 5 may also be formed in other ways. Instead of the illustrated Mantels can also be used simply a band that rotates over several pulleys. Instead of the roller 6, it is also possible to use another counterpressure element, for example a further strip which is supported by a pressure shoe.

Die Walze 6 kann Heizkanäle 12 aufweisen, durch die ein Wärmeträgermedium, beispielsweise Dampf oder heißes Öl, geleitet werden kann, um die Bahn 2 im Breitnip 5 auf der später gestrichenen und zu bedruckenden Seite auf eine Temperatur von mindestens 100°C zu erwärmen. Anstelle der Heizkanäle können natürlich auch andere Heizeinrichtungen vorgesehen sein, beispielsweise eine Heizeinrichtung 13, die induktiv von innen oder von außen auf die Oberfläche 7 der Walze 6 wirkt.The roller 6 may have heating channels 12, through which a heat transfer medium, such as steam or hot oil, can be passed to heat the web 2 in the extended nip 5 on the later coated and printed side to a temperature of at least 100 ° C. Of course, other heating devices may also be provided instead of the heating channels, for example a heating device 13 which acts inductively on the surface 7 of the roller 6 from inside or from outside.

Möglichst nahe vor dem Breitnip 5 ist eine Befeuchtungseinrichtung 14 angeordnet, beispielsweise ein Dampffeuchter, ein Düsenfeuchter oder dergleichen. Hier soll nur eine oberflächennahe Schicht vom Wasser penetriert werden, um eine volumenschonende Glättung zu bewirken (moisture gradient calendering).As close as possible in front of the broad nip 5, a moistening device 14 is arranged, for example a steam humidifier, a nozzle moistener or the like. Here, only a layer near the surface should be penetrated by the water, in order to effect a volume-gentle smoothing (moisture gradient calendering).

Durch die hohe Temperatur im Breitnip 5 und die Befeuchtung vor dem Breitnip 5 ist es möglich, zumindest die Seite der Bahn 2, die im Breitnip an der Oberfläche 7 der Walze 6 anliegt, mit einer relativ guten Mikroglätte zu versehen, d.h. einer Rauhigkeit von maximal 6 µm. Diese Mikroglätte wird ermittelt nach PPS-S10.Due to the high temperature in the nip 5 and the moistening in front of the nip 5, it is possible to provide at least the side of the web 2, which rests in the nip on the surface 7 of the roller 6, with a relatively good micro-smoothness, i. a roughness of a maximum of 6 microns. This micro-smoothness is determined according to PPS-S10.

Die Befeuchtungseinrichtung trägt eine Auftragsmenge von beispielsweise 1 bis 5 g/m2 auf die Bahn 2 auf. Die aus der Vortrocknung der Kartonmaschine 3 stammende Bahn muß noch nicht allzu trocken sein. Vor dem Feuchtigkeitsauftrag durch die Befeuchtungseinrichtung 14 kann sie beispielsweise eine Bahnfeuchte von maximal 14 % aufweisen.The moistening device applies an application amount of, for example, 1 to 5 g / m 2 to the web 2. The originating from the predrying of the board machine 3 The track does not have to be too dry yet. Before the moisture application by the moistening device 14, for example, it can have a maximum web moisture content of 14%.

Nach dem Durchlaufen des Breitnips 5 wird die Bahn 2 durch einen weiteren Nip 15 geführt, der im vorliegenden Ausführungsbeispiel als weicher Nip ausgebildet ist. Der weiche Nip 15 ist gebildet zwischen einer harten Walze 16 und einer weichen Walze 17 mit einem elastischen Oberflächenbelag 18.After passing through the broad nip 5, the web 2 is guided by a further nip 15, which is formed in the present embodiment as a soft nip. The soft nip 15 is formed between a hard roller 16 and a soft roller 17 having an elastic surface covering 18.

Anstelle des dargestellten weichen Nips kann auch ein harter Nip vorgesehen sein, bei dem der Nip durch zwei harte Walzen gebildet wird.Instead of the illustrated soft nip may also be provided a hard nip, in which the nip is formed by two hard rollers.

Die Druckspannungen im Breitnip 5 und im Nip 15 sollten nach folgenden Gesichtspunkten gewählt werden. Einerseits möchte man ein volumenschonendes Glätten erreichen. Andererseits soll die notwendige Verdichtung bewirkt werden, die eine verbesserte Bedruckbarkeit ergibt. Im Breitnip 5 stellt man die Druckspannungen auf maximal 3 N/mm2 ein. Im Nip 15 sollte eine Streckenlast von maximal 60 N/mm, vorzugsweise sogar nur maximal 20 bis 30 N/mm, herrschen.The compressive stresses in the nip 5 and nip 15 should be selected according to the following criteria. On the one hand, you want to achieve a volume-smoothing. On the other hand, the necessary compaction is to be effected, which results in an improved printability. In the broad nip 5, the compressive stresses are set to a maximum of 3 N / mm 2 . The nip 15 should have a maximum line load of 60 N / mm, preferably only a maximum of 20 to 30 N / mm.

Nach dem Durchlaufen des Nips 15 wird die Bahn 2 einer oder mehreren Strich-Auftragseinrichtungen 19 (nur eine dargestellt) zugeführt, bei der die Bahn 2 beispielsweise durch einen Auftragsnip 20 zwischen zwei Auftragswalzen 21, 22 geführt ist. Jede Auftragswalze 21, 22 ist mit einer Auftragseinrichtung 23, 24 versehen, die eine Streichfarbe auf die Oberfläche der Auftragswalzen 21, 22 aufträgt. Wenn dann die Bahn 2 den Auftragsnip 20 durchläuft, wird diese Streichfarbe auf die Bahn 2 übertragen. Es sind eine oder mehrere Oberund/oder Rückseiten-Strichaufträge möglich.After passing through the nip 15, the web 2 is fed to one or more coating applicators 19 (only one shown), in which the web 2 is guided, for example, by an applicator nip 20 between two applicator rollers 21, 22. Each applicator roll 21, 22 is provided with an applicator 23, 24 which applies a coating color to the surface of the applicator rolls 21, 22 applies. If then the web 2 passes through the Auftragnip 20, this coating color is transferred to the web 2. One or more top and / or backsheet jobs are possible.

Wenn nur ein einseitiger Strichauftrag erwünscht ist, dann wird man nur eine Auftragseinrichtung 23, 24 verwenden, vorzugsweise auf derjenigen Seite der Bahn 2, die im Breitnip 5 an der glatten Oberfläche 7 der Walze 6 angelegen hat. Im allgemeinen Fall werden zwei bis drei Oberseiten-Strichaufträge und eine Rückseitenbehandlung durchgeführt.If only a single-sided coating application is desired, then one will use only an applicator 23, 24, preferably on that side of the web 2, which has been in the extended nip 5 on the smooth surface 7 of the roller 6. In the general case, two to three top sheet jobs and one back side treatment are performed.

Die Streichfarbe wird mit einer Masse von mindestens 15 g/m2 aufgetragen. Das Wasserrückhaltevermögen der Streichfarbe sollte mindestens 75 s betragen. Die Streichfarbe kann Binder und Pigmente enthalten.The coating color is applied with a mass of at least 15 g / m 2 . The water retention capacity of the coating should be at least 75 s. The coating color may contain binders and pigments.

Eine derartig behandelte Kartonbahn 2 ist insbesondere für den Offset-Druck gut geeignet.Such a treated board web 2 is particularly well suited for offset printing.

Claims (8)

  1. Method for treating a board web, which is led through an extended nip and subsequently provided with at least one application of coating, the web being pre-calendered in the extended nip (5) to a micro-roughness of a maximum of 6 µm (PPS-S10), characterized in that, between the extended nip (5) and the first application of coating (19), the web is re-calendered in at least one nip (15), which is formed between a hard roll (16) and a soft roll (17) having a resilient cover (18) or between two hard rolls.
  2. Method according to Claim 1, characterized in that the board web (2) is moistened before the extended nip (5).
  3. Method according to Claim 1 or 2, characterized in that the board web (2) is heated to a temperature of at least 100°C in the extended nip (5).
  4. Method according to one of Claims 1 to 3, characterized in that the liner of the board web (2) is adjusted before the extended nip (5) by means of body sizing such that it has a liquid absorption capacity according to Cobb of a maximum of 50 g water/m2 in a time of 60 s on an area of 100 cm2.
  5. Method according to Claim 4, characterized in that the sizing is performed in the approach flow system of the board machine.
  6. Method according to one of Claims 1 to 5, characterized in that a coating colour having a total mass of at least 15 g/m2 is applied.
  7. Method according to Claim 6, characterized in that a coating colour having a water retention capacity of at least 50 s, in particular in the range from 50 to 80 s, is used.
  8. Method according to one of Claims 1 to 7, characterized in that the re-calendering is performed with a linear load in the range from 10 to 30 N/mm.
EP04101459A 2003-04-11 2004-04-08 Method for treating a cardboard web Expired - Lifetime EP1467020B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10316851A DE10316851B4 (en) 2003-04-11 2003-04-11 Process for treating a board web
DE10316851 2003-04-11

Publications (2)

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EP1467020A1 EP1467020A1 (en) 2004-10-13
EP1467020B1 true EP1467020B1 (en) 2011-01-19

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EP04101459A Expired - Lifetime EP1467020B1 (en) 2003-04-11 2004-04-08 Method for treating a cardboard web

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EP (1) EP1467020B1 (en)
AT (1) ATE496170T1 (en)
DE (2) DE10316851B4 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI115543B (en) * 2000-06-20 2005-05-31 Metso Paper Inc Procedure for preliminary calendering, post-processing and apparatus for carrying out the processes
FI115405B (en) 2000-06-20 2005-04-29 Metso Paper Inc Calendering method especially for pre-calendering and paper processing line
FI20011291A (en) * 2001-06-18 2002-12-19 Metso Paper Inc Process and paper machine for making coated paper
FI111281B (en) * 2001-12-12 2003-06-30 Metso Paper Inc Cardboard finishing procedure

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DE502004012118D1 (en) 2011-03-03
ATE496170T1 (en) 2011-02-15
DE10316851B4 (en) 2007-02-08
DE10316851A1 (en) 2005-01-05
EP1467020A1 (en) 2004-10-13

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