EP2071076B1 - Web treatment device - Google Patents

Web treatment device Download PDF

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Publication number
EP2071076B1
EP2071076B1 EP08165676A EP08165676A EP2071076B1 EP 2071076 B1 EP2071076 B1 EP 2071076B1 EP 08165676 A EP08165676 A EP 08165676A EP 08165676 A EP08165676 A EP 08165676A EP 2071076 B1 EP2071076 B1 EP 2071076B1
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EP
European Patent Office
Prior art keywords
web
belts
treatment device
supercalendering
rolls
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Expired - Fee Related
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EP08165676A
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German (de)
French (fr)
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EP2071076A1 (en
Inventor
Jochen Autrata
Lars KRÜGER
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP2071076A1 publication Critical patent/EP2071076A1/en
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00Calenders; Smoothing apparatus
    • D21G1/006Calenders; Smoothing apparatus with extended nips
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/0209Wet presses with extended press nip

Definitions

  • the invention relates to a calendering web treatment device for a fibrous web, comprising at least two rolls and at least two circulating flexible identical strips guided over sub-circumferences of the roll.
  • the invention will be described below for a calender for smoothing paper and board webs.
  • band is also to be understood as meaning a very flexible jacket of a shoe roller clamped at its axial ends
  • the state of the art is the DE 10157691 A1 to call. In this publication, two strips are passed over subsections of a roller.
  • a calender in which a web is smoothed between a roller and a circulating metal band which wraps around the roller over a partial circumference. According to Fig. 2 and related description of this application is also intended to guide the web between two bands.
  • the summary object of the invention is therefore to provide a calendering web treatment device which applies pressure and heat to both sides of a web in long treatment zones in the same way.
  • the bands are made of plastic or alternatively of metal, in particular steel. Both materials offer advantages as well as disadvantages depending on the web to be treated.
  • a plastic band is cheaper and produces by its elasticity a more uniform compaction of the web.
  • the metal band is smoother to produce (with the smoothness on the web transmits) and wear-resistant.
  • guide rollers are provided for the circulating belts and that a roller is arranged so that it deflects the straight course of at least one belt between two guide rollers in order to create a treatment zone.
  • the band is stretched over the guide rollers, at least one of which is displaceable. In this volume, the roller "dips". Depending on the depth of immersion result in different lengths and adjustable in this way treatment zones.
  • the tension in the belt can be used to control the pressure on the web in the treatment zone.
  • At least two rollers are provided, in which the web runs in each case over a roller circumferential section between two belts. In this way it is possible to satinize the web once up and once down in a treatment zone. Any heat input or output is also equalized.
  • the Brulaufpfad the web runs from the first to the second roller between two bands.
  • the bands take over a heat-insulating function or over the cross-profile temperature-compensating function, depending on whether the bands are made of plastic or metal.
  • both rollers deflect the straight course of at least one band between two guide rollers to create two treatment zones.
  • the overlapping belts make the system only insignificantly longer, but one gains a second treatment zone in which a pressure on the web can be set independently of the first one.
  • the deflection and thus the wrap angle is adjustable via adjusting devices for at least one roller.
  • the pressures and the length of the treatment zone can be varied.
  • Such Walzenverstell pleaseden are known from the calender construction sufficiently.
  • hydraulic cylinders engage below the bearings to move the roller axis.
  • the bands approach each other in the direction of the web travel path in front of a treatment zone and thus form a funnel-like web inlet section. This results in a very simple web presentation, for example after a web break.
  • At least one roller and / or alternatively at least one belt can be heated. Heated rolls are well known in papermaking. In the event that it is a steel strip, the strip can simply be made via an inductive external heating with which the temperature can additionally be profiled over the transverse profile. Preferred surface temperatures for the treatment of a paper web are between 40 and 300 ° C.
  • At least one roller has an adjustability in its bending.
  • Such rolls are also known as rolls with hydrostatic support elements or in the form of so-called S-rolls.
  • S-rolls The use of such rolls offers the advantage that profile problems, for example in the bulk of the web to be treated, can be compensated.
  • FIGS. 1 to 3 show schematic representations of the inventive calendering web treatment device.
  • the calendering web treatment device 1 in FIG. 1 1 illustrates a calender for calendering paper and has two belts 5, 6.
  • the first belt 5 circumscribes a roller 4 and a guide roller 10.
  • the second belt 6 circulates a roller 3 and a guide roller 10. All rollers 3, 4 are preferably driven in a manner not shown via electric motors.
  • the web 2 is located between the belts 5, 6. It is supplied via a funnel-shaped inlet section 12, which is formed by the belts 5, 6 at the entrance of the web treatment device. Subsequent to the inlet section 12, the bands 5, 6 run parallel over a part of their total length and form a kind of sandwich with the web in the middle.
  • a treatment zone 9 with pressures of between 0.1 and 100 MPa is applied to the web due to the tensile stress in the belts.
  • an additional force transducer 15 provide, as he exemplified in the form of hydrostatic support elements in a roller 3 in FIG. 2 is shown.
  • To equalize the compression of the web can in a manner not shown for it be ensured that the surface of at least one roller is provided with an elastic coating.
  • the bands 5, 6 are made of the same material.
  • metal bands are provided with a smooth surface.
  • plastic bands are possibly better suited. The web is thus applied on both sides with the same surface quality.
  • a roller 3, 4 be heated from the inside, which in Fig. 1 is indicated by the peripheral bores 13 in the roller 4, through which a heat transfer fluid can be passed.
  • an external heating is used, which is usually an inductive heater 14. This can act on the metal strip and / or the roller 3.
  • Fig. 2 the additional advantage to the web treatment device 1 is added that the two rollers 3, 4 can also act against each other.
  • Force generators 15 press the shell of the roll 3 radially in the direction of the axis of roll 4.
  • the belts 5, 6 and the web 2 experience in the axial line-shaped area in which the roll surfaces would abut each other, if neither belt 5, 6 nor web 2 in between, a pressure pulse that is desirable on certain types of paper.
  • Fig. 3 shows a relatively short of the prior art web treatment device 1 with six long treatment zones 9 between two bands.
  • the rollers 3, 4 are arranged so that intermediate spaces 16 are provided, in which the web. 2 only from one side by a band 5, 6 is covered. In these spaces 16, the web 2 is accessible for moistening via a moistening device 17.
  • a moistening device 17 For certain types of paper moistening before or during calendering is beneficial to the gloss and smoothness.

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  • Paper (AREA)
  • Soil Working Implements (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The device (1) has two flexible belts (5, 6) circularly guided over a partial circumference of rollers (3, 4), where the belts are formed from metal or plastic. A running path of a web (2) runs through a roller circumference section (alpha) from the roller (3) to the roller (4) between the belts. The web is admitted into a conditioning zone (9) of 80 millimeters with pressure between 0.1 and 100 Mega Pascal. The deflection and the length of the conditioning zone are adjusted by an adjusting device (11) for the rollers.

Description

Die Erfindung betrifft eine Satinage-Bahnbehandlungsvorrichtung für eine Faserstoffbahn, mit wenigstens zwei Walzen und wenigstens zwei über Teilumfänge der Walze geführten umlaufenden flexiblen gleichartigen Bändern.The invention relates to a calendering web treatment device for a fibrous web, comprising at least two rolls and at least two circulating flexible identical strips guided over sub-circumferences of the roll.

Im Folgenden wird die Erfindung für einen Kalander zur Glättung von Papier- und Kartonbahnen beschrieben.The invention will be described below for a calender for smoothing paper and board webs.

Da im Rahmen der Erfindung unter dem Begriff Band auch ein an seinen axialen Enden eingespannter, sehr flexibler Mantel einer Schuhwalze verstanden werden soll, ist als Stand der Technik die DE 10157691 A1 zu nennen. In dieser Veröffentlichung werden zwei Bänder über Teilumfänge einer Walze geführt.Since, in the context of the invention, the term band is also to be understood as meaning a very flexible jacket of a shoe roller clamped at its axial ends, the state of the art is the DE 10157691 A1 to call. In this publication, two strips are passed over subsections of a roller.

In der WO 03/064761 ist ein Kalander offenbart, bei dem eine Bahn zwischen einer Walze und einem umlaufenden Metallband, das die Walze über einen Teilumfang umschlingt, geglättet wird. Gemäß Fig. 2 und dazugehöriger Beschreibung dieser Anmeldung ist auch vorgesehen, die Bahn zwischen zwei Bändern zu führen.In the WO 03/064761 a calender is disclosed in which a web is smoothed between a roller and a circulating metal band which wraps around the roller over a partial circumference. According to Fig. 2 and related description of this application is also intended to guide the web between two bands.

Dieser Stand der Technik hat den Nachteil, dass die Bahn auf beiden Seiten ungleichmäßig behandelt wird. Um die andere Seite der Bahn genauso behandeln zu können, muss der ersten eine zweite, spiegelverkehrte Einrichtung nachgeschaltet werden. Es ist also das erste Ziel der Erfindung diese ungleichmäßige Behandlung von Bahnseiten zu vermeiden bzw. die gleichmäßige Behandlung in einer Behandlungsvorrichtung zu vereinen.This prior art has the disadvantage that the web is treated unevenly on both sides. In order to be able to treat the other side of the web in the same way, the first must be followed by a second, mirror-inverted device. It is therefore the first object of the invention to avoid this uneven treatment of web pages or to unite the uniform treatment in a treatment device.

Ansatzweise wird dieser Aufgabe in der WO 98/044195 Rechnung getragen. Dort werden zwei Bänder genutzt, um eine Papierbahn zwischen sich und durch herkömmliche Walzennips zu führen (siehe insbesondere Abb. 4). Zwischen den Walzennips gibt es nahezu keine Druckbeaufschlagung auf die Bahn. Der Vorteil einer langen Behandlungszone, in der die Bahn mit Druck und Temperatur beaufschlagt wird, ist zum Zeitpunkt dieser Anmeldung noch nicht erkannt worden. Unter einer langen Behandlungszone sind hier Längen oberhalb von 80 mm zu verstehen.Appropriately, this task is in the WO 98/044195 Taken into account. There two belts are used to guide a paper web between them and by conventional roll nips (see in particular Fig. 4). There is almost no pressure on the web between the roll nips. The advantage of a long treatment zone in which the web is subjected to pressure and temperature has not been recognized at the time of this application. A long treatment zone here means lengths above 80 mm.

Die zusammengefasste Aufgabe der Erfindung ist es demnach, eine Satinage-Bahnbehandlungsvorrichtung zu schaffen, die beide Seiten einer Bahn in gleicher Weise mit Druck und Wärme in langen Behandlungszonen beaufschlagt.The summary object of the invention is therefore to provide a calendering web treatment device which applies pressure and heat to both sides of a web in long treatment zones in the same way.

Die Aufgabe wird durch eine Satinage-Bahnbehandlungsvorrichtung für eine Faserstoffbahn gelöst, mit wenigstens zwei Walzen und wenigstens zwei über Teilumfänge der wenigstens zwei Walzen geführten umlaufenden flexiblen gleichartigen Bändern,

  • wobei der Bahnlaufpfad der Faserstoffbahn jeweils über einen Walzenumfangsabschnitt zwischen zwei Bändern verläuft und die Bahn in diesen mindestens 80 mm langen Behandlungszonen mit Drücken zwischen 0,1 und 100 MPa beaufschlagbar ist,
  • wobei der Bahnlaufpfad von der ersten zur zweiten Walze zwischen zwei Bändern verläuft und die zwei Walzen auf gegenübediegenden Seiten der Faserstoffbahn angeordnet sind, und
  • wobei wenigstens eine Walze und/oder wenigstens ein Band beheizbar ist.
The object is achieved by a calendering web treatment device for a fibrous web, comprising at least two rolls and at least two circulating flexible similar strips guided over sub-circumferences of the at least two rolls,
  • wherein the web running path of the fibrous web extends in each case over a roll circumferential section between two bands and the web can be acted upon in these at least 80 mm long treatment zones with pressures between 0.1 and 100 MPa,
  • wherein the web running path extends from the first to the second roller between two belts and the two rollers are arranged on opposite sides of the fibrous web, and
  • wherein at least one roller and / or at least one belt is heatable.

Über jeweils einen Umfangsabschnitt der wenigstens zwei Walzen wird die Bahn zwischen zwei gleichartigen Bändern geführt. Auf diese Weise liegen auf beiden Seiten der Bahn Materialien mit gleicher Rauigkeit an, was zu einer gleichförmigen Glätte auf beiden Seiten führt. Die Bandspannungen ermöglichen Druckkräfte im Bereich der Umlenkung der Bänder, also auf einem Walzenumfangsabschnitt, der als Behandlungszone bezeichnet ist, auf die Bahn, die für eine Satinage, eine ausreichende Belastung mitbringen. Dies gilt insbesondere für Papier- oder Kartonbahnen, die keine hohen Druckbeaufschlagungen, also im Bereich von 0,1 bis 10 MPa, benötigen. Mit der Erfindung sind aber auch höherwertige graphische Papiere satinierbar, wenn Zusatzdruckgeber im Bereich der Behandlungszone eingerichtet sind, die Druckspannungen bis 100 MPa ermöglichen. In Versuchen hat sich gezeigt, dass Behandlungszonen in einem Walzenumfangsabschnitt ab einer Länge von 80 mm besonders gute Resultate in Bezug auf Satinageergebnisse (Glätte, Bulk, Zweiseitigkeit) erbringen, wenn die Bahn zwischen zwei gleichartigen Bändern geführt ist.Over each peripheral portion of the at least two rollers, the web is guided between two similar bands. In this way, there are materials with the same on both sides of the web Roughness, resulting in a uniform smoothness on both sides. The belt tensions allow compressive forces in the region of the deflection of the belts, that is, on a roller peripheral section, which is referred to as a treatment zone, on the web, which bring a sufficient load for a calendering. This is especially true for paper or board webs that do not require high pressure loads, ie in the range of 0.1 to 10 MPa. With the invention but also higher-quality graphic papers are satin, if additional pressure sensors are set up in the treatment zone, the compressive stresses allow up to 100 MPa. Experiments have shown that treatment zones in a roll peripheral section from a length of 80 mm provide particularly good results in terms of calendering results (smoothness, bulk, two-sidedness) when the web is guided between two identical belts.

Es ist von Vorteil, wenn die Bänder aus Kunststoff bzw. alternativ aus Metall, insbesondere Stahl, bestehen. Beide Materialen bieten Vor-, aber auch Nachteile in Abhängigkeit von der zu behandelnde Bahn. Ein Kunststoffband ist preiswerter und erzeugt durch seine Elastizität eine gleichmäßigere Verdichtung der Bahn. Das Metallband ist glatter herstellbar (wobei sich die Glätte auf die Bahn überträgt) und verschleißfester.It is advantageous if the bands are made of plastic or alternatively of metal, in particular steel. Both materials offer advantages as well as disadvantages depending on the web to be treated. A plastic band is cheaper and produces by its elasticity a more uniform compaction of the web. The metal band is smoother to produce (with the smoothness on the web transmits) and wear-resistant.

Es ist günstig, wenn für die umlaufenden Bänder Leitwalzen vorgesehen sind und dass eine Walze so angeordnet ist, dass sie den geraden Verlauf wenigstens eines Bandes zwischen zwei Leitwalzen ablenkt, um eine Behandlungszone zu schaffen. Das Band wird über die Leitwalzen, von denen wenigstens eine verschiebbar ist, gespannt. In dieses Band "taucht" die Walze ein. Je nach Eintauchtiefe ergeben sich unterschiedlich lange und auf diese Weise einstellbare Behandlungszonen. Über die Zugspannung im Band kann der Druck auf die Bahn in der Behandlungszone gesteuert werden.It is favorable if guide rollers are provided for the circulating belts and that a roller is arranged so that it deflects the straight course of at least one belt between two guide rollers in order to create a treatment zone. The band is stretched over the guide rollers, at least one of which is displaceable. In this volume, the roller "dips". Depending on the depth of immersion result in different lengths and adjustable in this way treatment zones. The tension in the belt can be used to control the pressure on the web in the treatment zone.

Es sind wenigstens zwei Walzen vorgesehen, bei denen die Bahn jeweils über einen Walzenumfangsabschnitt zwischen zwei Bändern verläuft. Auf diese Weise ist es möglich, die Bahn einmal nach oben und einmal nach unten gekrümmt in einer Behandlungszone zu satinieren. Ein eventueller Wärmezu- oder -abfluss wird ebenfalls vergleichmäßigt.At least two rollers are provided, in which the web runs in each case over a roller circumferential section between two belts. In this way it is possible to satinize the web once up and once down in a treatment zone. Any heat input or output is also equalized.

Der Bahnlaufpfad der Bahn verläuft von der ersten zur zweiten Walze zwischen zwei Bändern. Die Bänder übernehmen dabei eine wärmeisolierende Funktion oder eine über das Querprofil temperaturausgleichende Funktion, je nachdem ob die Bänder aus Kunststoff oder Metall sind.The Bahnlaufpfad the web runs from the first to the second roller between two bands. The bands take over a heat-insulating function or over the cross-profile temperature-compensating function, depending on whether the bands are made of plastic or metal.

Von ganz besonderem Vorteil ist es, wenn beide Walzen den geraden Verlauf wenigstens eines Bandes zwischen zwei Leitwalzen ablenken um zwei Behandlungszonen zu schaffen. Im Vergleich mit nur einer "eintauchenden" Walze wird die Anlage durch die überlappenden Bänder nur unwesentlich länger, aber man gewinnt eine zweite Behandlungszone, bei der unabhängig von der ersten ein Druck auf die Bahn eingestellt werden kann.Of particular advantage is when both rollers deflect the straight course of at least one band between two guide rollers to create two treatment zones. Compared with only one "plunging" roller, the overlapping belts make the system only insignificantly longer, but one gains a second treatment zone in which a pressure on the web can be set independently of the first one.

Mit Vorteil ist dafür gesorgt, dass die Ablenkung und somit der Umschlingungswinkel über Verstelleinrichtungen für wenigstens eine Walze einstellbar ist. Wie bereits erwähnt, können so die Drücke und die Länge der Behandlungszone variiert werden. Solche Walzenverstelleinrichtungen sind aus dem Kalanderbau hinreichend bekannt. In der Regel greifen Hydraulikzylinder unterhalb der Lager an, um die Walzenachse zu verschieben. Es ist aber auch bekannt, solche Verstellwege lediglich durch einen radial beweglichen Mantel, der um eine feststehende Achse dreht, zu realisieren.Advantageously, it is ensured that the deflection and thus the wrap angle is adjustable via adjusting devices for at least one roller. As already mentioned, the pressures and the length of the treatment zone can be varied. Such Walzenverstelleinrichtungen are known from the calender construction sufficiently. As a rule, hydraulic cylinders engage below the bearings to move the roller axis. However, it is also known to realize such adjustment paths only by a radially movable shell which rotates about a fixed axis.

Vorzugsweise nähern sich die Bänder in Richtung des Bahnlaufpfades vor einer Behandlungszone einander an und bilden so einen trichterartigen Bahneinlaufabschnitt. Dies hat eine sehr einfache Bahnaufführung beispielsweise nach einem Bahnriss zur Folge.Preferably, the bands approach each other in the direction of the web travel path in front of a treatment zone and thus form a funnel-like web inlet section. This results in a very simple web presentation, for example after a web break.

Da eine Satinage einer Papierbahn nie ohne Wärmeeinwirkung erfolgt sind wenigstens eine Walze und/oder alternativ wenigstens ein Band beheizbar. Beheizte Walzen sind im Papiermaschinenbau hinreichend bekannt. Das Band kann für den Fall, dass es ein Stahlband ist, einfach über eine induktive Außenheizung erfolgen, mit der die Temperatur zusätzlich über das Querprofil profilierbar sein kann. Bevorzugte Oberflächentemperaturen zur Behandlung einer Papierbahn liegen zwischen 40 und 300°C.Since a calendering of a paper web never takes place without the action of heat, at least one roller and / or alternatively at least one belt can be heated. Heated rolls are well known in papermaking. In the event that it is a steel strip, the strip can simply be made via an inductive external heating with which the temperature can additionally be profiled over the transverse profile. Preferred surface temperatures for the treatment of a paper web are between 40 and 300 ° C.

Um einen kurzen Druckimpuls innerhalb der Behandlungszone zu erreichen, kann es sinnvoll sein, wenn zwei Walzen unter Dazwischenschalten wenigstens eines Bandes und der Faserstoffbahn über Kraftgeber gegeneinander pressbar sind. Um die Verdichtung der Bahn zu vergleichmäßigen kann dafür gesorgt werden, dass die Oberfläche wenigstens einer Walze mit einem elastischen Belag versehen ist.In order to achieve a short pressure pulse within the treatment zone, it may be useful if two rollers with the interposition of at least one band and the fibrous web via force transmitters are pressed against each other. To even out the compaction of the web it can be ensured that the surface of at least one roller is provided with an elastic covering.

Bevorzugt weist in diesem Fall wenigstens eine Walze eine Einstellbarkeit in ihrer Biegung auf. Solche Walzen sind als Walzen mit hydrostatischen Stützelementen oder in Form von sogenannten S-Walzen ebenfalls bekannt. Der Einsatz solcher Walzen bietet den Vorteil, dass Profilprobleme beispielsweise im Bulk der zu behandelnden Bahn ausgeglichen werden können.Preferably, in this case, at least one roller has an adjustability in its bending. Such rolls are also known as rolls with hydrostatic support elements or in the form of so-called S-rolls. The use of such rolls offers the advantage that profile problems, for example in the bulk of the web to be treated, can be compensated.

Die Erfindung wird im Folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnungen näher erläutert. Die Figuren 1 bis 3 zeigen schematische Darstellungen der erfindungsgemäßen Satinage-Bahnbehandlungsvorrichtung.The invention is explained in more detail below with reference to exemplary embodiments with reference to the drawings. The FIGS. 1 to 3 show schematic representations of the inventive calendering web treatment device.

Die Satinage-Bahnbehandlungseinrichtung 1 in Figur 1 stellt einen Kalander zur Satinage von Papier dar und besitzt zwei Bänder 5, 6. Das erste Band 5 umläuft eine Walze 4 und eine Leitwalze 10. In ähnlicher Gestaltung umläuft das zweite Band 6 eine Walze 3 und eine Leitwalze 10. Alle Walzen 3, 4 sind vorzugsweise in nicht dargestellter Weise über Elektromotoren angetrieben. Der normalerweise gerade Verlauf des Bandes, der sich aus der Tangente an die Walzen 3, 4 und ihrer zugehörigen Leitwalze 10 ergibt, wird durch das "Eintauchen" der Walze 3 in das Band 5 bzw. durch das "Eintauchen" der Walze 4 in das Band 6 abgelenkt. Dieses "Eintauchen" erfolgt über eine Verstelleinrichtung 11 der Walze 3, 4, die beispielhaft als Hydraulikzylinder, der an der Achse der Walze 4 angreift, dargestellt ist. Dadurch ergibt sich ein Umfangsabschnitt α an der Walze 3, 4, in dem beide Bänder 5, 6 an der Walze 3, 4 anliegen.The calendering web treatment device 1 in FIG. 1 1 illustrates a calender for calendering paper and has two belts 5, 6. The first belt 5 circumscribes a roller 4 and a guide roller 10. In a similar configuration, the second belt 6 circulates a roller 3 and a guide roller 10. All rollers 3, 4 are preferably driven in a manner not shown via electric motors. The normally straight course of the band resulting from the tangent to the rollers 3, 4 and their associated guide roller 10, by the "immersion" of the roller 3 in the belt 5 and by the "immersion" of the roller 4 in the Band 6 distracted. This "immersion" via an adjusting device 11 of the roller 3, 4, which is exemplified as a hydraulic cylinder which acts on the axis of the roller 4, is shown. This results in a peripheral portion α on the roller 3, 4, in which both bands 5, 6 abut the roller 3, 4.

Zwischen den Bändern 5, 6 befindet sich die Bahn 2. Sie wird über einen trichterförmigen Einlaufabschnitt 12, der durch die Bänder 5, 6 am Eingang der Bahnbehandlungsvorrichtung gebildet wird, zugeführt. Im Anschluss an den Einlaufabschnitt 12 verlaufen die Bänder 5, 6 über einen Teil ihrer Gesamtlänge parallel und bilden mit der Bahn in der Mitte eine Art Sandwich.The web 2 is located between the belts 5, 6. It is supplied via a funnel-shaped inlet section 12, which is formed by the belts 5, 6 at the entrance of the web treatment device. Subsequent to the inlet section 12, the bands 5, 6 run parallel over a part of their total length and form a kind of sandwich with the web in the middle.

Im Bereich des Umfangsabschnitts α an einer Walze 3, 4 wird dabei auf die Bahn aufgrund der Zugspannung in den Bändern eine Behandlungszone 9 mit Drücken zwischen 0,1 und 100 MPa aufgebracht. Zur Realisierung der hohen angegeben Drücke ist in der Regel ein zusätzlicher Kraftgeber 15 vorzusehen, wie er beispielhaft in Form von hydrostatischen Stützelementen in einer Walze 3 in Figur 2 dargestellt ist. Um die Verdichtung der Bahn zu vergleichmäßigen kann in nicht dargestellter Weise dafür gesorgt werden, dass die Oberfläche wenigstens einer Walze mit einem elastischen Belag versehen ist.In the area of the circumferential section α on a roller 3, 4, a treatment zone 9 with pressures of between 0.1 and 100 MPa is applied to the web due to the tensile stress in the belts. To realize the high indicated pressures is usually an additional force transducer 15 provide, as he exemplified in the form of hydrostatic support elements in a roller 3 in FIG. 2 is shown. To equalize the compression of the web can in a manner not shown for it be ensured that the surface of at least one roller is provided with an elastic coating.

Die Bänder 5, 6 sind aus dem gleichen Material gefertigt. In den Ausführungsbeispielen sind Metallbänder mit einer glatten Oberfläche vorgesehen. Für bestimmte Papiersorten, insbesondere matte Papiersorten, sind aber ggf. Kunststoffbänder besser geeignet. Die Bahn wird also auf beiden Seiten mit der gleichen Oberflächenqualität beaufschlagt.The bands 5, 6 are made of the same material. In the embodiments metal bands are provided with a smooth surface. For certain types of paper, especially matte types of paper, but plastic bands are possibly better suited. The web is thus applied on both sides with the same surface quality.

Um die vorteilhafte über 80 mm lange Behandlungszone zwischen zwei Bändern noch besser zur Satinage nutzen zu können, muss Wärme in die Bahn eingebracht werden. Dazu kann beispielsweise eine Walze 3, 4 von innen beheizbar sein, was in Fig. 1 über die peripheren Bohrungen 13 in der Walze 4 angedeutet ist, durch die eine Wärmeträgerfluid geleitet werden kann. Oder es wird eine Außenheizung verwendet, die in der Regel eine induktive Heizung 14 ist. Diese kann auf das Metallband und/oder die Walze 3 wirken.To be able to use the advantageous over 80 mm long treatment zone between two bands even better for calendering, heat must be introduced into the web. For this purpose, for example, a roller 3, 4 be heated from the inside, which in Fig. 1 is indicated by the peripheral bores 13 in the roller 4, through which a heat transfer fluid can be passed. Or an external heating is used, which is usually an inductive heater 14. This can act on the metal strip and / or the roller 3.

In Fig. 2 kommt der zusätzliche Vorteil zu der Bahnbehandlungseinrichtung 1 hinzu, dass die beiden Walzen 3, 4 auch gegeneinander wirken können. Kraftgeber 15 pressen den Mantel der Walze 3 radial in Richtung der Achse von Walze 4. Die Bänder 5, 6 und die Bahn 2 erfahren in dem axialen linienförmigen Bereich, in dem die Walzenoberflächen aneinander anliegen würden, wenn weder Band 5, 6 noch Bahn 2 dazwischen geschalten wären, einen Druckimpuls, der bei bestimmten Papiersorten erwünscht ist.In Fig. 2 the additional advantage to the web treatment device 1 is added that the two rollers 3, 4 can also act against each other. Force generators 15 press the shell of the roll 3 radially in the direction of the axis of roll 4. The belts 5, 6 and the web 2 experience in the axial line-shaped area in which the roll surfaces would abut each other, if neither belt 5, 6 nor web 2 in between, a pressure pulse that is desirable on certain types of paper.

Fig. 3 zeigt eine relativ zum Stand der Technik sehr kurz bauende Bahnbehandlungseinrichtung 1 mit sechs langen Behandlungszonen 9 zwischen zwei Bändern. In vorteilhafter Weise sind die Walzen 3, 4 so angeordnet, dass Zwischenräume 16 vorgesehen sind, in denen die Bahn 2 nur von einer Seite durch ein Band 5, 6 bedeckt ist. In diesen Zwischenräumen 16 ist die Bahn 2 zugänglich für eine Befeuchtung über eine Befeuchtungseinrichtung 17. Für bestimmte Papiersorten ist eine Befeuchtung vor oder während der Satinage gewinnbringend für den Glanz und die Glätte. Fig. 3 shows a relatively short of the prior art web treatment device 1 with six long treatment zones 9 between two bands. Advantageously, the rollers 3, 4 are arranged so that intermediate spaces 16 are provided, in which the web. 2 only from one side by a band 5, 6 is covered. In these spaces 16, the web 2 is accessible for moistening via a moistening device 17. For certain types of paper moistening before or during calendering is beneficial to the gloss and smoothness.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
BahnbehandlungsvorrichtungWeb treatment device
22
Bahntrain
3 bis 43 to 4
Walzeroller
5 bis 85 to 8
Bandtape
99
Behandlungszonetreatment zone
1010
Band-LeitwalzeTape guide roll
1111
Verstelleinrichtungadjustment
1212
BahneinlaufabschnittWeb inlet section
1313
Periphere HeizbohrungPeripheral heating hole
1414
Induktionsheizunginduction heating
1515
Kraftgeberforce transmitter
1616
Zwischenraumgap
1717
Befeuchtungseinrichtunghumidifying

Claims (9)

  1. Supercalendering web treatment device for a fibrous web, having at least two rolls (3, 4) and at least two identical circulating flexible belts (5, 6, 7, 8) guided over parts of the circumferences of the at least two rolls (3, 4),
    - the web running path of the fibrous web (2) in each case running over a roll circumferential section (α) between two belts (5, 6, 7, 8) and it being possible for the web (2) to have pressures between 0.1 and 100 MPa applied to it in these at least 80 mm long treatment zones (9),
    - the web running path running from the first to the second roll (3, 4) between two belts (5, 6, 7, 8), and the two rolls (3, 4) being arranged on opposite sides of the fibrous web (2), and
    - it being possible for at least one roll (3, 4) and/or at least one belt (5, 6, 7, 8) to be heated.
  2. Supercalendering web treatment device according to Claim 1, characterized in that the belts (5, 6, 7, 8) consist of a plastic.
  3. Supercalendering web treatment device according to Claim 1, characterized in that the belts (5, 6, 7, 8) consist of metal.
  4. Supercalendering web treatment device according to one of Claims 1 to 3, characterized in that guide rolls (10) are provided for the circulating belts (5, 6, 7, 8), and in that one roll (3, 4) is arranged such that it deflects the straight run of at least one belt (5, 6, 7, 8) between two guide rolls (10) in order to create a treatment zone (9).
  5. Supercalendering web treatment device according to one of Claim 4, characterized in that both rolls (3, 4) deflect the straight run of at least one belt (5, 6, 7, 8) between two guide rolls (10) in order to create two treatment zones (9).
  6. Supercalendering web treatment device according to one of Claims 5 to 6, characterized in that the deflection and thus the length of the treatment zone (9) can be adjusted by adjusting devices (11) for at least one roll (3, 4).
  7. Supercalendering web treatment device according to one of Claims 1 to 6, characterized in that the belts (5, 6, 7, 8) approach each other in the direction of the web running path before a treatment zone (9) and in this way form a funnel-like web inlet section (12).
  8. Supercalendering web treatment device according to one of Claims 1 to 7, characterized in that two rolls (3, 4) can be pressed against each other via power sources (15), with the interposition of at least one belt (5, 6, 7, 8) and the web (2) between the said rolls.
  9. Supercalendering web treatment device according to one of Claims 1 to 8, characterized in that the deflection of at least one roll (3, 4) can be adjusted.
EP08165676A 2007-12-10 2008-10-02 Web treatment device Expired - Fee Related EP2071076B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007055734A DE102007055734A1 (en) 2007-12-10 2007-12-10 Web treatment device

Publications (2)

Publication Number Publication Date
EP2071076A1 EP2071076A1 (en) 2009-06-17
EP2071076B1 true EP2071076B1 (en) 2010-08-18

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EP08165676A Expired - Fee Related EP2071076B1 (en) 2007-12-10 2008-10-02 Web treatment device

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EP (1) EP2071076B1 (en)
AT (1) ATE478192T1 (en)
DE (2) DE102007055734A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010061903A1 (en) 2010-11-24 2012-05-24 Metso Paper, Inc. Module for fiber web processing machine for manufacturing e.g. paper, has tape loop whose length is set in specific manner such that tape rests in mounted state over preset length against backing roll of fiber web processing machine
EP2549013B1 (en) * 2011-07-21 2018-01-31 Valmet Technologies, Inc. Process and arrangement for producing a fiber web

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE575453C (en) * 1931-12-12 1933-04-28 Siempelkamp Gmbh & Co Pressing device
US5389205A (en) * 1990-11-23 1995-02-14 Valmet Paper Machinery, Inc. Method for dewatering of a paper web by pressing using an extended nip shoe pre-press zone on the forming wire
FI102304B (en) 1997-04-02 1998-11-13 Valmet Corp Calendering method and calender applying the method
US6676807B2 (en) * 2001-11-05 2004-01-13 Kimberly-Clark Worldwide, Inc. System and process for reducing the caliper of paper webs
DE10157691B4 (en) 2001-11-24 2005-12-22 Voith Paper Patent Gmbh Calender and method for smoothing a fibrous web
CN100371529C (en) 2002-01-29 2008-02-27 梅特索纸业有限公司 Processing device and method of operating the device for processing a coated or uncoated fibrous web

Also Published As

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DE502008001150D1 (en) 2010-09-30
DE102007055734A1 (en) 2009-06-18
EP2071076A1 (en) 2009-06-17
ATE478192T1 (en) 2010-09-15

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