EP0967324B1 - Process for smoothing a paper web - Google Patents

Process for smoothing a paper web Download PDF

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Publication number
EP0967324B1
EP0967324B1 EP99110294A EP99110294A EP0967324B1 EP 0967324 B1 EP0967324 B1 EP 0967324B1 EP 99110294 A EP99110294 A EP 99110294A EP 99110294 A EP99110294 A EP 99110294A EP 0967324 B1 EP0967324 B1 EP 0967324B1
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EP
European Patent Office
Prior art keywords
accordance
smoothing
endless band
zone
heatable
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EP99110294A
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German (de)
French (fr)
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EP0967324A3 (en
EP0967324A2 (en
Inventor
Michael Kaupmann
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Publication of EP0967324A2 publication Critical patent/EP0967324A2/en
Publication of EP0967324A3 publication Critical patent/EP0967324A3/en
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Publication of EP0967324B1 publication Critical patent/EP0967324B1/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

Definitions

  • the invention relates to a device for smoothing a material web, in particular a paper or cardboard web, with at least one smoothing zone, through which the material web is passed.
  • the aim of the invention is to provide a device of the type mentioned create, in which the aforementioned disadvantages are eliminated and in construction as simple as possible, especially without heavy ones heated hard rollers or the like an optimal treatment of the material web and in particular an optimal satin result is guaranteed.
  • This object is achieved according to the invention in that at least a smoothing zone between a soft or elastic surface Deflection adjustment roller and a hard and smooth Heated endless belt with high thermal conductivity is formed, which in the area of the smoothing zone within an Band loop lying support surface and inside with a Heating medium is acted on so that on the one hand this endless belt heats up and on the other hand by the same heating medium between the support surface and the endless belt with hydrodynamic lubrication Liquid film is built up.
  • A is preferably used as the heating medium hot gaseous medium such as steam is used, the then a liquid film causing hydrodynamic lubrication is expediently built up by the condensed heating medium.
  • the device is the heatable endless belt in the web running direction the support surface with the heating medium, which if necessary for timely condensation and thus always for reliable hydrodynamic lubrication is provided.
  • the heating device can, for example, be a zone-controlled one Steam humidifier or steam box.
  • the support surface can be supported by at least a support element can be formed, at least in the area of this Support surface is cooled.
  • a metal band may be provided as a heatable endless belt with high thermal conductivity.
  • the support surface is expedient to provide smoothness and / or gloss values formed by at least one fixed, highly rigid support element.
  • a support shoe or the like can in particular be used as the support element be provided.
  • Condensate discharge agent provided inside the belt loop of the heatable endless belt. These are preferred arranged behind the support in the direction of web travel. You can For example, include at least one discharge channel, for example at least one discharge channel with an associated doctor blade can be provided can. Alternatively or additionally, at least one suction can also be used be provided.
  • the area is within, in particular by a suitable swath removal the web loop is expediently kept at ambient pressure.
  • the heatable endless belt can have at least one belt guide roller and / or at least one tension roller.
  • the device according to the invention is at least one that has a hard and smooth surface heatable endless belt at the same time several each a soft or assigned deflection rolls with elastic surface, a corresponding one with each of these deflection adjusting rollers To form a smoothing zone.
  • the material web can at least a smoothing zone with one side and in at least one other Smoothing zone with its other side with a heatable endless belt in Are in contact.
  • FIG. 1 shows a smoothing zone 10 of a purely schematic representation Device 12 for smoothing a material web 14, which is in particular can be a paper or cardboard web.
  • the smoothing zone 10 is between an elastic jacket or elastic Covering deflection roller 16 and a hard and smooth surface with all-round heatable Endless belt 18 of high thermal conductivity, such as in particular a metal belt educated.
  • the heatable endless belt 18 is over a support surface 20 of a fixed, lying within the band loop guided highly rigid support member 22, which in the present case immediately arranged above the deflection compensation roller 16 and in its lower region, which has the support surface 20, is shoe-like is.
  • a heating device 28 is arranged, by means of which the inside of the revolving heatable endless belt 18 with a hot gaseous Medium such as steam in particular can be acted on on the one hand this endless belt 18 heated and on the other hand by the condensed Heating medium between the support surface 20 and the endless belt 18 a Liquid film 30 causing hydrodynamic lubrication is built up becomes.
  • the heating device 28 is in Web running direction L arranged in front of the support surface 20.
  • the case is between a lower left web guide roller 24 and the shoe-like lower portion of the support member 22 is provided.
  • the heating device 28 is one over the web width zone-controlled steam humidifier or steam blower box 32 is provided, by means of which the heatable endless belt 18 zone-controlled with the hot gaseous medium or steam can be acted upon.
  • the heating device 28 is one over the web width zone-controlled steam humidifier or steam blower box 32 is provided, by means of which the heatable endless belt 18 zone-controlled with the hot gaseous medium or steam can be acted upon.
  • the heatable endless belt 18 zone-controlled with the hot gaseous medium or steam can be acted upon.
  • in principle is the use of any other sectional injector conceivable for a heated fluid.
  • the support element 22 can at least be cooled in the area of the support surface 20.
  • Condensate discharge means are located within the belt loop of the heatable endless belt 18 32 provided in the present case in the direction of web travel L are provided behind the support surface 20.
  • This condensate drain 32 can, for example, at least one discharge channel, for example with an associated doctor, and / or at least one suction include.
  • the area is within the band loop kept at ambient pressure by a suitable swath discharge.
  • FIG. 2 An embodiment is shown in FIG. 2 in a purely schematic representation a smoothing device with two each a hard and smooth surface having heatable endless belts 18 of high thermal conductivity shown, each three simultaneously an elastic jacket or elastic Coating having deflection adjustment rollers 16 assigned are one with each of these deflection adjustment rollers 16 to form the corresponding smoothing zone 10.
  • Each of the two is heated Endless belts 18 in the area of each smoothing zone 10 again on the inside supported by at least one support element 22 in front of each again a heating device 28 is arranged to the relevant heatable endless belt 18 with a hot gaseous medium or To apply steam that in the area of the respective smoothing zone 10 on the one hand the relevant endless belt 18 heated and on the other hand by the condensed heating medium between the relevant support surface 20 and the endless belt 18 which effects hydrodynamic lubrication Liquid film 30 is built up. Inside the ribbon loops can again condensate removal means 32 (see FIG. 1) or the like be provided.
  • FIG. 2 there are three smoothing zones 10 in each case arranged vertically one above the other and the two three smoothing zones 10 comprehensive zone groups are provided horizontally next to each other.
  • the material web 14 is in the present First around a lower left web guide roller 34, then generally up through the first three smoothing zones 10, then over two upper web guide rollers 36, then generally after below through the last three smoothing zones 10 and then over one guided lower right web guide roller 38.
  • the two heated circumferential Endless belts 18 are each again via web guide rollers 24 and guided at least one tension roller.
  • the heaters 28 are used again a sectionally controllable and / or adjustable heat supply possible.
  • the heating devices 28 can again, for example be formed by internal steam blow boxes.
  • the support surfaces 20 of the inside of the belt loops provided support elements 22 are again hydrodynamically through the condensate of the gaseous medium in question or steam lubricated.
  • the desired smoothing process takes place each on the side of the concerned, each one hard and smooth Surface having heated endless belt 18, the material web 14 is smoothed on both sides in the present case.

Description

Die Erfindung betrifft eine Vorrichtung zum Glätten einer Materialbahn, insbesondere einer Papier- oder Kartonbahn, mit wenigstens einer Glättzone, durch die die Materialbahn hindurchgeführt ist.The invention relates to a device for smoothing a material web, in particular a paper or cardboard web, with at least one smoothing zone, through which the material web is passed.

Bei einem aus der EP 0 361 402 A1 bekannten Kalander dieser Art sind die Glättzonen jeweils zwischen einer beheizten Hartgußwalze und einem mit einem weichen oder elastischen Bezug versehenen Endlosband gebildet. Ein jeweiliger Glättvorgang erfolgt somit stets auf der der jeweiligen Hartgußwalze zugewandten Seite der Materialbahn. Demzufolge muß jeweils eine relativ schwere, lange Aufheiz- und Abkühlzeiten mit sich bringende beheizte Hartgußwalze eingesetzt werden, die zudem in der Regel nur mit schwerem Gerät handhabbar ist. Dieser bekannte Kalander ist im Aufbau relativ aufwendig und kompliziert. Ein eventuell erforderlicher Austausch der schweren und zudem zu beheizenden Walzen ist mit einem beträchtlichen Aufwand verbunden. Die Verwendung einer beheizten Hartgußwalze mit entsprechenden Lagerungen bringt somit in der Praxis eine Reihe von Nachteilen mit sich, die u.a. auf deren großen Masse, den langen Aufheiz- bzw. Abkühlzeiten und insbesondere auch dem Umstand beruhen, daß ein entsprechendes Handling nur mit schwerem Gerät möglich ist, woraus sich auch ergibt, daß der Einsatz solcher Walzen insgesamt äußerst kostenintensiv ist. Es muß auch zumindest eine komplette Ersatzwalze bereitgestellt werden. Einer zonalen Erwärmung steht in der Praxis bereits der beträchtliche Aufwand entgegen, der mit den hier in der Regel erforderlichen Induktions-Segmenten zwangsläufig verbunden wäre. In a calender of this type known from EP 0 361 402 A1 the smoothing zones each between a heated chill roll and a formed with a soft or elastic cover endless belt. A respective smoothing process always takes place on that of the respective one Chilled iron roller facing side of the material web. Accordingly, each must a relatively difficult, long heating up and cooling down time heated chilled cast iron roller are used, which also usually can only be handled with heavy equipment. This well-known calender is in the Construction relatively complex and complex. A possibly necessary The heavy and also heated rollers can be replaced with a considerable effort. The use of a heated Chilled cast iron roller with appropriate bearings thus brings in practice a number of disadvantages, which include on their great mass, the long heating or cooling times and especially the circumstance are based on the fact that appropriate handling is only possible with heavy equipment is, from which it follows that the use of such rollers as a whole is extremely expensive. It must also be at least a complete one Replacement roller can be provided. A zonal warming is in the Practice already counteracts the considerable effort involved with the here in the Required induction segments would inevitably be connected.

Schließlich sind für große Walzen entsprechend hohe Drücke und hohe Temperaturen erforderlich.After all, there are high pressures and high pressures for large rolls Temperatures required.

Ziel der Erfindung ist es, eine Vorrichtung der eingangs genannten Art zu schaffen, bei der die zuvor genannten Nachteile beseitigt sind und die bei möglichst einfach gehaltenem Aufbau insbesondere auch ohne schwere beheizte Hartwalzen oder dergleichen eine optimale Behandlung der Materialbahn und insbesondere ein optimales Satinageergebnis gewährleistet.The aim of the invention is to provide a device of the type mentioned create, in which the aforementioned disadvantages are eliminated and in construction as simple as possible, especially without heavy ones heated hard rollers or the like an optimal treatment of the material web and in particular an optimal satin result is guaranteed.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß zumindest eine Glättzone zwischen einer eine weiche oder elastische Oberfläche aufweisenden Durchbiegungseinstellwalze und einem eine harte und glatte Oberfläche aufweisenden beheizbaren Endlosband hoher Wärmeleitfähigkeit gebildet ist, das im Bereich der Glättzone über eine innerhalb der Bandschlaufe liegende Stützfläche geführt und innenseitig mit einem Heizmedium so beaufschlagt ist, daß einerseits dieses Endlosband erhitzt und andererseits durch dasselbe Heizmedium zwischen der Stützfläche und dem Endlosband ein eine hydrodynamische Schmierung bewirkender Flüssigkeitsfilm aufgebaut wird. Als Heizmedium wird vorzugsweise ein heißes gasförmiges Medium wie insbesondere Dampf verwendet, wobei der eine hydrodynamische Schmierung bewirkende Flüssigkeitsfilm dann zweckmäßigerweise durch das kondensierte Heizmedium aufgebaut wird.This object is achieved according to the invention in that at least a smoothing zone between a soft or elastic surface Deflection adjustment roller and a hard and smooth Heated endless belt with high thermal conductivity is formed, which in the area of the smoothing zone within an Band loop lying support surface and inside with a Heating medium is acted on so that on the one hand this endless belt heats up and on the other hand by the same heating medium between the support surface and the endless belt with hydrodynamic lubrication Liquid film is built up. A is preferably used as the heating medium hot gaseous medium such as steam is used, the then a liquid film causing hydrodynamic lubrication is expediently built up by the condensed heating medium.

Aufgrund dieser Ausbildung ergibt sich ein insgesamt wesentlich vereinfachter Aufbau ohne die bisher üblichen schweren beheizten Walzen, wobei trotz des einfacheren Aufbaus optimale Glätte- und Glanzwerte, d.h. optimale Satinageergebnis gewährleistet sind. Während die nicht zu heizende Durchbiegungseinstellwalze eine weiche oder elastische Oberfläche aufweist bzw. mit einem elastischen Mantel oder einem elastischen Belag versehen ist, besitzt das auf der anderen Seite der Materialbahn vorgesehene beheizte Endlosband eine harte und glatte Oberfläche, so daß der gewünschte Glättvorgang auf der Seite des beheizten Endlosbandes erfolgt. Die weiche oder elastische Oberfläche der Durchbiegungseinstellwalze sorgt für eine gleichmäßige Verdichtung. Mit der innenseitigen Beaufschlagung des eine hohe Wärmeleitfähigkeit aufweisenden Endlosbandes mit einem heißen gasförmigen Medium wie insbesondere Dampf wird nicht nur das Endlosband erhitzt. Gleichzeitig ist durch das kondensierte Heizmedium zwischen der Stützfläche und dem Endlosband auch für eine hydrodynamische Schmierung gesorgt. Durch das in der Schmierspalt eingeschleppte Kondensat wird dort nämlich ein entsprechender Flüssigkeitsfilm aufgebaut. Der innenseitigen Beaufschlagung des Endlosbandes mit einem gasförmigen Medium bzw. Dampf kommt somit erfindungsgemäß eine doppelte Funktion zu. Zudem ist ein eventuell erforderlicher Austausch eines beheizbaren Endlosbandes mit minimalem Aufwand möglich. Mit dem beheizbaren Endlosband muß im Vergleich zu den bisher üblichen beheizten Hartgußwalzen auch nur eine relativ geringe Masse erwärmt bzw. gekühlt werden. Es ist keine Ersatzwalze mehr, sondern lediglich noch ein Ersatzband erforderlich, wodurch die Gesamtkosten weiter reduziert werden. Die Erwärmung kann kostengünstig insbesondere durch Dampf oder ein anderes gasförmiges Medium erfolgen. Eine zusätzliche Schmierung ist nicht erforderlich. Diese wird durch das Kondensat des gasförmigen Mediums bzw. Dampfes bewirkt. Das Endlosband hoher Wärmeleitfähigkeit kann ohne weiteres sowohl insgesamt als auch zonal beheizt werden, wobei insbesondere auch eine zonale Beheizung problemlos und mit minimalem Aufwand möglich ist. This training results in an overall significantly simplified Construction without the usual heavy heated rollers, whereby Despite the simpler structure, optimal smoothness and gloss values, i.e. optimal satin result are guaranteed. While the not to be heated Deflection adjustment roller has a soft or elastic surface has or with an elastic jacket or an elastic covering is provided, has that provided on the other side of the material web heated endless belt a hard and smooth surface so that the Desired smoothing process takes place on the side of the heated endless belt. The soft or elastic surface of the deflection adjustment roller ensures even compaction. With the inside exposure of the endless belt with a high thermal conductivity with a hot gaseous medium such as steam not only heated the endless belt. At the same time is condensed by the Heating medium between the support surface and the endless belt also for one hydrodynamic lubrication. Through that in the lubrication gap entrained condensate becomes an appropriate liquid film built up. The inside loading of the endless belt with a gaseous medium or steam thus comes according to the invention a double function too. In addition, a may be required Exchange of a heatable endless belt with minimal effort possible. With the heated endless belt compared to the previous one usual heated chilled cast iron rollers also only a relatively small mass be warmed or cooled. It is no longer a replacement roller, but rather only a spare strap is required, reducing the total cost can be further reduced. The heating can be inexpensive in particular by steam or another gaseous medium. An additional Lubrication is not necessary. This is due to the condensate of the gaseous medium or steam. The endless belt higher Thermal conductivity can easily be both overall and zonal be heated, and in particular zonal heating without problems and is possible with minimal effort.

Die Verwendung eines beheizbaren Endlosbandes hoher Wärmeleitfähigkeit ist zwar bereits aus der EP 0 370 185 A1 bekannt. So ist die dort beschriebene Vorrichtung mit einem Metallband versehen. Dieses Metallband wird jedoch von außen mittels einer Induktionsheizung beheizt. Alternativ kann ein mit Dampf oder Heißluft beaufschlagtes nicht metallisches Band vorgesehen sein. Auch in diesem Fall wird das Band wieder von außen beheizt. Zudem sind bei dieser bekannten Vorrichtung beide eine jeweilige Glättzone begrenzenden Flächen beheizt, wozu auf der einen Seite insbesondere wieder eine beheizte Walze vorgesehen ist. Anstelle dieser beheizten Walze kann auch ein beheiztes verstellbares Stützelement verwendet werden.The use of a heatable endless belt with high thermal conductivity is already known from EP 0 370 185 A1. That is how it is described Provide the device with a metal band. This metal band is heated from the outside by means of induction heating. alternative can be a non-metallic one exposed to steam or hot air Band may be provided. In this case too, the tape will be back heated from the outside. In addition, both are in this known device heated surfaces delimiting a respective smoothing zone, for which purpose on one In particular, a heated roller is again provided. Instead of this heated roller can also be a heated adjustable support element be used.

Bei einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Vorrichtung ist das beheizbare Endlosband in Bahnlaufrichtung vor der Stützfläche mit dem Heizmedium beaufschlagt, wodurch gegebenenfalls für eine rechtzeitige Kondensation und damit stets auch für eine zuverlässige hydrodynamische Schmierung gesorgt ist.In a preferred practical embodiment of the invention The device is the heatable endless belt in the web running direction the support surface with the heating medium, which if necessary for timely condensation and thus always for reliable hydrodynamic lubrication is provided.

Mit einer über die Bahnbreite zonengesteuerten Heizvorrichtung, mittels der das beheizbare Endlosband zonengesteuert mit dem Heizmedium beaufschlagbar ist, ist eine weitere Optimierung der Bahnbehandlung möglich. Dabei kann die Heizeinrichtung beispielsweise einen zonengesteuerten Dampffeuchter oder Dampfblaskasten umfassen.With a heating device which is zone-controlled over the web width, by means of which can be acted upon by zone heating with the heating medium a further optimization of the web treatment is possible. The heating device can, for example, be a zone-controlled one Steam humidifier or steam box.

Zur Unterstützung der Kondensatbildung kann die Stützfläche durch wenigstens ein Stützelement gebildet sein, das zumindest im Bereich dieser Stützfläche gekühlt ist. To support the formation of condensate, the support surface can be supported by at least a support element can be formed, at least in the area of this Support surface is cooled.

Als beheizbares Endlosband hoher Wärmeleitfähigkeit kann beispielsweise ein Metallband vorgesehen sein.For example, as a heatable endless belt with high thermal conductivity a metal band may be provided.

Um auf der betreffenden Seite der Materialbahn für möglichst optimale Glätte- und/oder Glanzwerte zu sorgen, ist die Stützfläche zweckmäßigerweise durch wenigstens ein feststehendes, hochsteifes Stützelement gebildet. Als Stützelement kann insbesondere ein Stützschuh oder dergleichen vorgesehen sein.To be on the relevant side of the material web for the best possible The support surface is expedient to provide smoothness and / or gloss values formed by at least one fixed, highly rigid support element. A support shoe or the like can in particular be used as the support element be provided.

Innerhalb der Bandschlaufe des beheizbaren Endlosbandes sind vorteilhafterweise Kondensatabführmittel vorgesehen. Diese sind vorzugsweise in Bahnlaufrichtung hinter der Stützeinrichtung angeordnet. Sie können beispielsweise wenigstens eine Abführrinne umfassen, wobei beispielsweise wenigstens eine Abführrinne mit zugeordneter Rakel vorgesehen sein kann. Alternativ oder zusätzlich kann auch wenigstens eine Absaugung vorgesehen sein.Inside the belt loop of the heatable endless belt are advantageously Condensate discharge agent provided. These are preferred arranged behind the support in the direction of web travel. You can For example, include at least one discharge channel, for example at least one discharge channel with an associated doctor blade can be provided can. Alternatively or additionally, at least one suction can also be used be provided.

Insbesondere durch eine geeignete Schwadenabfuhr wird der Bereich innerhalb der Bahnschlaufe zweckmäßigerweise auf Umgebungsdruck gehalten.The area is within, in particular by a suitable swath removal the web loop is expediently kept at ambient pressure.

Das beheizbare Endlosband kann über wenigstens eine Bandleitwalze und/oder wenigstens eine Spannwalze geführt sein.The heatable endless belt can have at least one belt guide roller and / or at least one tension roller.

Bei einer zweckmäßigen Ausführungsform der erfindungsgemäßen Vorrichtung ist zumindest ein eine harte und glatte Oberfläche aufweisendes beheizbares Endlosband gleichzeitig mehreren jeweils eine weiche oder elastische Oberfläche aufweisenden Durchbiegungseinstellwalzen zugeordnet, um mit jeder dieser Durchbiegungseinstellwalzen jeweils eine entsprechende Glättzone zu bilden.In an expedient embodiment of the device according to the invention is at least one that has a hard and smooth surface heatable endless belt at the same time several each a soft or assigned deflection rolls with elastic surface, a corresponding one with each of these deflection adjusting rollers To form a smoothing zone.

Sind mehrere Glättzonen vorgesehen, so kann die Materialbahn in wenigstens einer Glättzone mit einer Seite und in wenigstens einer anderen Glättzone mit ihrer anderen Seite mit einem beheizbaren Endlosband in Kontakt stehen.If several smoothing zones are provided, the material web can at least a smoothing zone with one side and in at least one other Smoothing zone with its other side with a heatable endless belt in Are in contact.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:

Figur 1
eine rein schematische Darstellung einer Glättzone einer Vorrichtung zum Glätten einer Materialbahn und
Figur 2
eine rein schematische Darstellung einer weiteren Ausführungsform einer Vorrichtung zum Glätten einer Materialbahn mit zwei jeweils mehreren Durchbiegungseinstellwalzen zugeordneten beheizbaren Endlosbändern.
The invention is explained below using exemplary embodiments with reference to the drawing; in this show:
Figure 1
a purely schematic representation of a smoothing zone of a device for smoothing a material web and
Figure 2
a purely schematic representation of a further embodiment of a device for smoothing a material web with two heatable endless belts, each associated with a plurality of deflection adjusting rollers.

Figur 1 zeigt in rein schematischer Darstellung eine Glättzone 10 einer Vorrichtung 12 zum Glätten einer Materialbahn 14, bei der es sich insbesondere um eine Papier- oder Kartonbahn handeln kann.FIG. 1 shows a smoothing zone 10 of a purely schematic representation Device 12 for smoothing a material web 14, which is in particular can be a paper or cardboard web.

Die Glättzone 10 ist zwischen einer einen elastischen Mantel oder elastischen Belag aufweisenden Durchbiegungseinstellwalze 16 und einem eine harte und glatte Oberfläche aufweisenden umlaufenden beheizbaren Endlosband 18 hoher Wärmeleitfähigkeit wie insbesondere einem Metallband gebildet.The smoothing zone 10 is between an elastic jacket or elastic Covering deflection roller 16 and a hard and smooth surface with all-round heatable Endless belt 18 of high thermal conductivity, such as in particular a metal belt educated.

Im Bereich der Glättzone 10 ist das beheizbare Endlosband 18 über eine innerhalb der Bandschlaufe liegende Stützfläche 20 eines feststehenden, hochsteifen Stützelements 22 geführt, das im vorliegenden Fall unmittelbar oberhalb der Durchbiegungsausgleichswalze 16 angeordnet und in seinem unteren, die Stützfläche 20 aufweisenden Bereich schuhartig ausgebildet ist.In the area of the smoothing zone 10, the heatable endless belt 18 is over a support surface 20 of a fixed, lying within the band loop guided highly rigid support member 22, which in the present case immediately arranged above the deflection compensation roller 16 and in its lower region, which has the support surface 20, is shoe-like is.

Außerhalb des Bereichs des allgemein vertikal ausgerichteten Stützelements 22 ist das beheizbare Endlosband über mehrere Bandleitwalzen 24 und eine Spannwalze 26 geführt.Outside the area of the generally vertically oriented support element 22 is the heatable endless belt over a plurality of belt guide rollers 24 and a tension roller 26 out.

Innerhalb der durch das heizbare Endlosband 18 gebildeten Bandschlaufe ist eine Heizeinrichtung 28 angeordnet, mittels der die Innenseite des umlaufenden beheizbaren Endlosbandes 18 mit einem heißen gasförmigen Medium wie insbesondere Dampf so beaufschlagbar ist, daß einerseits dieses Endlosband 18 erhitzt und andererseits durch das kondensierte Heizmedium zwischen der Stützfläche 20 und dem Endlosband 18 ein eine hydrodynamische Schmierung bewirkender Flüssigkeitsfilm 30 aufgebaut wird.Within the belt loop formed by the heatable endless belt 18 a heating device 28 is arranged, by means of which the inside of the revolving heatable endless belt 18 with a hot gaseous Medium such as steam in particular can be acted on on the one hand this endless belt 18 heated and on the other hand by the condensed Heating medium between the support surface 20 and the endless belt 18 a Liquid film 30 causing hydrodynamic lubrication is built up becomes.

Wie anhand der Figur 1 zu erkennen ist, ist die Heizeinrichtung 28 in Bahnlaufrichtung L vor der Stützfläche 20 angeordnet. Im vorliegenden Fall ist sie zwischen einer linken unteren Bahnleitwalze 24 und dem schuhartigen unteren Abschnitt des Stützelements 22 vorgesehen. As can be seen from FIG. 1, the heating device 28 is in Web running direction L arranged in front of the support surface 20. In the present The case is between a lower left web guide roller 24 and the shoe-like lower portion of the support member 22 is provided.

Als Heizvorrichtung 28 ist im vorliegenden Fall ein über die Bahnbreite zonengesteuerter Dampffeuchter oder Dampfblaskasten 32 vorgesehen, mittels dem das beheizbare Endlosband 18 zonengesteuert mit dem heißen gasförmigen Medium bzw. Dampf beaufschlagbar ist. Grundsätzlich ist auch die Verwendung irgendeiner anderen sektionalen Einspritzvorrichtung für ein erwärmtes Fluid denkbar.In the present case, the heating device 28 is one over the web width zone-controlled steam humidifier or steam blower box 32 is provided, by means of which the heatable endless belt 18 zone-controlled with the hot gaseous medium or steam can be acted upon. in principle is the use of any other sectional injector conceivable for a heated fluid.

Zur Unterstützung der Kondensatbildung kann das Stützelement 22 zumindest im Bereich der Stützfläche 20 gekühlt sein.To support the formation of condensate, the support element 22 can at least be cooled in the area of the support surface 20.

Innerhalb der Bandschlaufe des beheizbaren Endlosbandes 18 sind Kondensatabführmittel 32 vorgesehen, die im vorliegenden Fall in Bahnlaufrichtung L hinter der Stützfläche 20 vorgesehen sind. Diese Kondensatabführmittel 32 können beispielsweise wenigstens eine Abführrinne, beispielsweise mit zugeordneter Rakel, und/oder wenigstens eine Absaugung umfassen. Im vorliegenden Fall ist der Bereich innerhalb der Bandschlaufe durch eine geeignete Schwadenabfuhr auf Umgebungsdruck gehalten.Condensate discharge means are located within the belt loop of the heatable endless belt 18 32 provided in the present case in the direction of web travel L are provided behind the support surface 20. This condensate drain 32 can, for example, at least one discharge channel, for example with an associated doctor, and / or at least one suction include. In the present case, the area is within the band loop kept at ambient pressure by a suitable swath discharge.

In der Figur 2 ist in rein schematischer Darstellung eine Ausführungsform einer Glättvorrichtung mit zwei jeweils eine harte und glatte Oberfläche aufweisenden beheizbaren Endlosbändern 18 hoher Wärmeleitfähigkeit gezeigt, die jeweils gleichzeitig drei einen elastischen Mantel oder elastischen Belag aufweisenden Durchbiegungseinstellwalzen 16 zugeordnet sind, um mit jeder dieser Durchbiegungseinstellwalzen 16 jeweils eine entsprechende Glättzone 10 zu bilden. Dabei ist jedes der beiden beheizbaren Endlosbänder 18 im Bereich jeder Glättzone 10 innenseitig wieder durch jeweils wenigstens ein Stützelement 22 abgestützt, vor dem jeweils auch wieder eine Heizeinrichtung 28 angeordnet ist, um das betreffende beheizbare Endlosband 18 so mit einem heißen gasförmigen Medium bzw. Dampf zu beaufschlagen, daß im Bereich der jeweiligen Glättzone 10 einerseits das betreffende Endlosband 18 erhitzt und andererseits durch das kondensierte Heizmedium zwischen der betreffenden Stützfläche 20 und dem Endlosband 18 ein eine hydrodynamische Schmierung bewirkender Flüssigkeitsfilm 30 aufgebaut wird. Innerhalb der Bandschlaufen können auch wieder Kondensatabführmittel 32 (vgl. Figur 1) oder dergleichen vorgesehen sein.An embodiment is shown in FIG. 2 in a purely schematic representation a smoothing device with two each a hard and smooth surface having heatable endless belts 18 of high thermal conductivity shown, each three simultaneously an elastic jacket or elastic Coating having deflection adjustment rollers 16 assigned are one with each of these deflection adjustment rollers 16 to form the corresponding smoothing zone 10. Each of the two is heated Endless belts 18 in the area of each smoothing zone 10 again on the inside supported by at least one support element 22 in front of each again a heating device 28 is arranged to the relevant heatable endless belt 18 with a hot gaseous medium or To apply steam that in the area of the respective smoothing zone 10 on the one hand the relevant endless belt 18 heated and on the other hand by the condensed heating medium between the relevant support surface 20 and the endless belt 18 which effects hydrodynamic lubrication Liquid film 30 is built up. Inside the ribbon loops can again condensate removal means 32 (see FIG. 1) or the like be provided.

Wie anhand der Figur 2 zu erkennen ist, sind jeweils drei Glättzonen 10 vertikal übereinander angeordnet und die beiden jeweils drei Glättzonen 10 umfassenden Zonengruppen horizontal nebeneinander vorgesehen. Dabei ist ein beheizbares Endlosband 18 der linken Gruppe von Glättzonen 10 und das andere beheizbare Endlosband 18 der anderen Gruppe von Glättzonen 10 zugeordnet, wobei die Materialbahn 14 in den ersten drei Glättzonen 10 mit einer Seite und in den letzten drei Glättzonen 10 mit ihrer anderen Seite mit dem jeweiligen beheizbaren Endlosband 18 in Kontakt steht.As can be seen from FIG. 2, there are three smoothing zones 10 in each case arranged vertically one above the other and the two three smoothing zones 10 comprehensive zone groups are provided horizontally next to each other. There is a heatable endless belt 18 of the left group of smoothing zones 10 and the other heatable endless belt 18 of the other group assigned by smoothing zones 10, the material web 14 in the first three smoothing zones 10 with one side and in the last three smoothing zones 10 with its other side with the respective heatable endless belt 18 in Contact is there.

Wie anhand der Figur 2 zu erkennen ist, ist die Materialbahn 14 im vorliegenden Fall zunächst um eine linke untere Bahnleitwalze 34, anschließend allgemein nach oben durch die ersten drei Glättzonen 10, anschließend über zwei obere Bahnleitwalzen 36, anschließend allgemein nach unten durch die drei letzten Glättzonen 10 und anschließend über eine untere rechte Bahnleitwalze 38 geführt. Die beiden beheizbaren umlaufenden Endlosbänder 18 sind jeweils wieder über Bahnleitwalzen 24 und wenigstens eine Spannwalze geführt. As can be seen from FIG. 2, the material web 14 is in the present First around a lower left web guide roller 34, then generally up through the first three smoothing zones 10, then over two upper web guide rollers 36, then generally after below through the last three smoothing zones 10 and then over one guided lower right web guide roller 38. The two heated circumferential Endless belts 18 are each again via web guide rollers 24 and guided at least one tension roller.

Auch im vorliegenden Fall ist über die Heizeinrichtungen 28 jeweils wieder eine sektional steuer- und/oder regelbare Wärmezufuhr möglich. Auch im vorliegenden Fall können die Heizeinrichtungen 28 beispielsweise wieder durch interne Dampfblaskästen gebildet sein. Die Stützflächen 20 der innerhalb der Bandschlaufen vorgesehenen Stützelemente 22 werden wieder hydrodynamisch durch das Kondensat des betreffenden gasförmigen Mediums bzw. Dampfes geschmiert. Der gewünschte Glättungsvorgang erfolgt jeweils auf der Seite des betreffenden, jeweils eine harte und glatte Oberfläche aufweisenden beheizten Endlosbandes 18, wobei die Materialbahn 14 im vorliegenden Fall beidseitig geglättet wird. In the present case too, the heaters 28 are used again a sectionally controllable and / or adjustable heat supply possible. Also in In the present case, the heating devices 28 can again, for example be formed by internal steam blow boxes. The support surfaces 20 of the inside of the belt loops provided support elements 22 are again hydrodynamically through the condensate of the gaseous medium in question or steam lubricated. The desired smoothing process takes place each on the side of the concerned, each one hard and smooth Surface having heated endless belt 18, the material web 14 is smoothed on both sides in the present case.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Glättzonesmoothing zone
1212
Glättvorrichtungsmoothing device
1414
Materialbahnweb
1616
Durchbiegungseinstellwalzedeflection
1818
beheizbares Endlosbandheated endless belt
2020
Stützflächesupport surface
2222
Stützelementsupport element
2424
Bandleitwalzebelt guide roll
2626
Spannwalzetension roller
2828
Heizeinrichtungheater
3030
Flüssigkeitsfilmliquid film
3232
Kondensatabführmittelcondensate removal
3434
Bahnleitwalzeweb guide
3636
Bahnleitwalzeweb guide
3838
Bahnleitwalzeweb guide
LL
BahnlaufrichtungWeb direction

Claims (13)

  1. Apparatus (12) for the smoothing of a material web (14), in particular a paper web or cardboard web, comprising at least one smoothing zone (10) through which the material web (14) can be passed, characterised in that at least one smoothing zone (10) is formed between a deflection controlled roll (16) having a soft or elastic surface and a heatable endless band (18) of high thermal conductivity having a hard and smooth surface which is guided in the region of the smoothing zone (10) over a support surface (20) lying within the band loop and is acted on at the inner side by a heating medium such that, on the one hand, this endless band (18) is heated and, on the other hand, a liquid film (30) bringing about a hydrodynamic lubrication is built up between the support surface (20) and the endless band (18) by the same heating medium.
  2. Apparatus in accordance with claim 1, characterised in that the heatable endless band is acted on at the inner side by a hot gaseous medium, such as in particular steam, and the liquid film (30) bringing about a hydrodynamic lubrication is built up by the condensed heating medium.
  3. Apparatus in accordance with claim 1 or 2, characterised in that the heatable endless band (18) is acted on by the heating medium upstream of the support surface (20) in the web running direction (L).
  4. Apparatus in accordance with one of the preceding claims, characterised in that a heating apparatus (28) controlled zone-wise over the web width is provided by means of which the heatable endless band (18) can be acted on by the heating medium with zone control, with said heating device (28) including a zone-controlled steam moistener or steam blowing box.
  5. Apparatus in accordance with one of the preceding claims, characterised in that the support surface (20) is formed by at least one support element (22) which is cooled, at least in the region of this support surface (20), in order to assist the formation of condensate.
  6. Apparatus in accordance with one of the preceding claims, characterised in that the heatable endless band (18) is formed by a metal band.
  7. Apparatus in accordance with one of the preceding claims, characterised in that the support surface (20) is formed by at least one stationary support element (22) of high stiffness, and in particular by at least one shoe-like support element (22).
  8. Apparatus in accordance with one of the preceding claims, characterised in that condensate removal means (32) are provided within the band loop of the heatable endless band (18), and indeed preferably downstream of the support surface (20) in the web running direction (L), in particular with the condensate removal means including at least one removal channel, and preferably with at least one removal channel with an associated wiper being provided.
  9. Apparatus in accordance with one of the preceding claims, characterised in that the condensate removal means (32) include at least one suction system.
  10. Apparatus in accordance with one of the preceding claims, characterised in that the region within the band loop is kept at ambient pressure.
  11. Apparatus in accordance with one of the preceding claims, characterised in that the heatable endless band (18) is guided over at least one band guiding roll (24) and/or at least one tensioning roll (26).
  12. Apparatus in accordance with one of the preceding claims, characterised in that at least one heatable endless band (18) having a hard and smooth surface is simultaneously associated with a plurality of deflection-controlled rolls (16), each having a soft or elastic surface, in order to form a corresponding smoothing zone (10) with each of these deflection controlled rolls (16).
  13. Apparatus in accordance with one of the preceding claims, characterised in that a plurality of smoothing zones (10) are provided, and in that one side of the material web (14) stands in contact with a heatable endless band (18) in at least one smoothing zone (10) and the other side of the material web stands in contact with a heatable endless band (18) in at least one other smoothing zone (10).
EP99110294A 1998-06-24 1999-05-27 Process for smoothing a paper web Expired - Lifetime EP0967324B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19828156A DE19828156A1 (en) 1998-06-24 1998-06-24 Device for smoothing a web of material
DE19828156 1998-06-24

Publications (3)

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EP0967324A2 EP0967324A2 (en) 1999-12-29
EP0967324A3 EP0967324A3 (en) 2000-02-23
EP0967324B1 true EP0967324B1 (en) 2002-11-06

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EP99110294A Expired - Lifetime EP0967324B1 (en) 1998-06-24 1999-05-27 Process for smoothing a paper web

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US (1) US6182564B1 (en)
EP (1) EP0967324B1 (en)
DE (2) DE19828156A1 (en)

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Also Published As

Publication number Publication date
DE19828156A1 (en) 1999-12-30
EP0967324A3 (en) 2000-02-23
DE59903293D1 (en) 2002-12-12
US6182564B1 (en) 2001-02-06
EP0967324A2 (en) 1999-12-29

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