EP0370185B2 - Process for smoothing a paper or cardboard web - Google Patents

Process for smoothing a paper or cardboard web Download PDF

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Publication number
EP0370185B2
EP0370185B2 EP89116409A EP89116409A EP0370185B2 EP 0370185 B2 EP0370185 B2 EP 0370185B2 EP 89116409 A EP89116409 A EP 89116409A EP 89116409 A EP89116409 A EP 89116409A EP 0370185 B2 EP0370185 B2 EP 0370185B2
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EP
European Patent Office
Prior art keywords
web
smoothing
zone
smoothing zone
belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP89116409A
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German (de)
French (fr)
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EP0370185B1 (en
EP0370185A1 (en
Inventor
Alfred Dr. Bubik
Hans Dr. Dahl
Rüdiger Dr. Kurtz
Herbert Holik
Peter Mirsberger
Harald Hess
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Sulzer Escher Wyss GmbH
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Sulzer Escher Wyss GmbH
Escher Wyss GmbH
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Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority to AT89116409T priority Critical patent/ATE76134T1/en
Publication of EP0370185A1 publication Critical patent/EP0370185A1/en
Publication of EP0370185B1 publication Critical patent/EP0370185B1/en
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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

Definitions

  • the invention relates to a method for smoothing a paper or cardboard web.
  • the aim of the invention is a method for smoothing a paper or cardboard web, at which is still a wet track, without having previously made an asymmetrical one To have to generate moisture profile with respect to the web thickness, as desired can be smoothed.
  • the use of pressure and temperature during the Smoothing process must be clear and easy to regulate.
  • the smoothing process is particularly clear and controllable as desired shape.
  • a relatively low pressure is used in the long smoothing zone via the support elements can be in places of higher basis weight of the paper or cardboard web Pressure peaks largely avoided and better product quality achieved. It can due to the relatively long smoothing zone and sufficiently long dwell time of the material in the smoothing zone and thus the desired smoothness values on both sides of the web higher web speeds can be achieved. Especially the application lower pressures and high temperatures of the contact surfaces with higher web moisture levels favor smoothing that is gentle on the volume of the web, what is wanted here.
  • Paper or cardboard web 1 takes place in at least one smoothing zone 2 at one defined duration of the smoothing process.
  • the material is in the smoothing zone 2 during a dwell time, which is the length of the smoothing zone 2 and the Web speed can be calculated.
  • the material to be smoothed i.e. the paper or Cardboard web exposed to an adjustable pressure in the smoothing zone 2.
  • the pressure can be relatively low.
  • About the surfaces 3 and 4 arranged on both sides of the web 1 are used Temperature, which together with the moisture of the web 1 to the desired smoothing the train leads.
  • the conditions can advantageously be chosen so that none overpressed areas in a web of uneven basis weight. This happens in the extended smoothing zone 2, which is long enough to have one in it sufficient dwell time of the material in view of the to be driven To achieve web speed.
  • the smoothing zone 2 must be so long that the desired one Smoothing process completed during the dwell time and the desired smoothness reached can be. The higher the web running speed should be, the longer it has to be generally the length of the smoothing zone can be designed.
  • a device which is shown schematically in various figures as an example shown versions is used to carry out the invention Procedure.
  • the device has a smoothing zone 2, which is between two to each other facing surfaces 3 and 4 is formed.
  • the surfaces 3 and 4 run towards each other parallel, are heated and adjustable to each other, so that the web 1 a defined Pressing pressure can be exposed.
  • the areas 3 and 4 extend over a Longitudinal section in the direction of web travel, which is indicated by an arrow.
  • a flexible belt 19 can also be used, which is guided in a known manner, not shown here, over rolling rollers and in the Smoothing zone 2 is formed into a convex shape by means of a support element 18.
  • the convex support surface is complementary to the opposite arranged concave surface of the support element 8.
  • a e.g. Induction heating for that Volume 19 is indicated in Fig. 1 and designated 20.
  • Another usable Device, e.g. for heating with steam or hot air is also indicated in Fig. 1 and designated 21. This would particularly advantageously be used if it was a non-metal tape 19.
  • the pressure to be applied in the smoothing zone 2 is determined by adjusting the pressure in the Pressure medium of the support element 8 or the support elements 8 and 18 can be generated.
  • the Surface temperature of the smoothing surface is by means of devices 20 and 21, respectively adjustable.
  • the moisture is given by the moisture of the web 1 to be treated.
  • the flexible tapes are tight, i.e. impermeable, and between the tape and the A support layer of the support element is provided, which is a liquid layer is built hydrostatic and / or hydrodynamic manner. It takes care of low-friction running of the belt along the support surfaces.
  • the liquid could Heating and temperature control for cooling.
  • the support elements can in themselves be known sliding shoes, with a liquid between the support surface and the Tape was introduced.
  • the support elements can also be known hydrostatic Be support elements.
  • the bands are supported by mutually adjustable support elements 9, see FIGS. 2 and 4, supported, each facing a flat band 7 Have support surface. They can be pressed against one another in a known manner in a defined manner. Although hydrostatic support elements are drawn here, sliding shoes are also from known type applicable. Between each band 7 and the flat support surface of the Support element 9, a liquid layer is provided, which in the example according to FIG. 2 is built hydrostatically. For this purpose, the support element faces the band 7 Pressure pockets 23, which can be acted upon with a pressure medium, if necessary tempered for heating or cooling. It is also possible to apply the liquid layer to build hydrodynamic ways, such as in Fig. 3 on the surface 3 be the case could.

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Abstract

The smoothing takes place in a smoothing zone (2), in which the operation is carried out under pressure using temperature and moisture. The desired smoothness is achieved with a correspondingly long residence time of the web of material (1) in a smoothing zone (2) which is correspondingly long having regard to the velocity of the web. A still moist web (1) is guided between heatable surfaces (3, 4) which are arranged on both sides of the web (1), face each other across the web, extend in parallel and can each be pressed against the web. The surfaces (3, 4) are constructed over their entire length for forming and holding a given, defined contour of smoothing zone (2). The one surface (3) is, for example, constructed as an outer surface (5) of a heated cylinder (6) and the second surface (4) is constructed as a continuous flexible belt (7) which can be pressed towards the outer surface (5) of the cylinder by means of a concave support element (8). <??>If desired, the web (1) can be smoothed on both sides using the method. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zum Glätten einer Papier- oder Kartonbahn.The invention relates to a method for smoothing a paper or cardboard web.

Ein solches Verfahren ist aus der Europäischen Patentanmeldung Nr. 0 141 614 A2 bekannt. Die lange Glättzone wird zwischen einem glatten Mantel einer beheizten Walze und einem den Mantel teilweise umschlingenden Band gebildet. Eine noch nicht kalandrierte Papier- oder Kartonbahn wird bezüglich der Bahndicke mehr oder weniger getrocknet oder befeuchtet und anschließend mit der Bahnseite der höheren Feuchte gegen den Mantel der beheizten Walze mittels des Bandes angedrückt. Die eine Oberfläche der Bahn wird damit während der Verweilzeit in der Glättzone geglättet. Ein gewünschter Glättvorgang erfolgt also nur an einer Seite der Bahn. Während des Glättvorgangs ist der Einsatz von Temperatur und Druck in der Glättzone unübersichtlich und schwer kontrollierbar.Such a method is known from European Patent Application No. 0 141 614 A2 known. The long smoothing zone is between a smooth jacket of a heated roller and a band partially wrapping around the jacket. Not yet calendered paper or cardboard web becomes more or less in terms of web thickness less dried or moistened and then with the web side of the higher one Moisture pressed against the jacket of the heated roller using the tape. The one The surface of the web is thus smoothed during the dwell time in the smoothing zone. On The desired smoothing process therefore only takes place on one side of the web. During the The smoothing process is the use of temperature and pressure in the smoothing zone confusing and difficult to control.

Ziel der Erfindung ist ein Verfahren zum Glätten einer Papier- oder Kartonbahn, bei dem eine noch feuchte Bahn, ohne zuvor in aufwendiger Weise ein asymmetrisches Feuchteprofil bezüglich der Bahndicke erzeugen zu müssen, jeweils wie gewünscht geglättet werden kann. Dabei sollen der Einsatz von Druck und Temperatur während des Glättvorgangs übersichtlich und gut regulierbar sein.The aim of the invention is a method for smoothing a paper or cardboard web, at which is still a wet track, without having previously made an asymmetrical one To have to generate moisture profile with respect to the web thickness, as desired can be smoothed. The use of pressure and temperature during the Smoothing process must be clear and easy to regulate.

Dieses Ziel wird durch Maßnahmen, die im Patentanspruch 1 angegeben sind, erreicht.This goal is achieved by measures that are defined in claim 1 specified are achieved.

Durch Anwendung von Maßnahmen, die in den Unteransprüchen angegeben sind, läßt sich der Glättvorgang besonders übersichtlich und kontrollierbar nach Wunsch gestalten. By applying measures that are specified in the subclaims the smoothing process is particularly clear and controllable as desired shape.

Da in der langen Glättzone über die Stützelemente ein relativ niedriger Druck eingesetzt werden kann, werden an Stellen höheren Flächengewichts der Papier- oder Kartonbahn Druckspitzen weitgehend vermieden und eine bessere Qualität des Produkts erzielt. Es können durch die relativ lange Glättzone und genügend lange Verweilzeit des Materials in der Glättzone und damit die gewünschten Glättwerte beiderseits der Bahn auch bei höheren Bahngeschwindigkeiten erreicht werden. Insbesondere die Anwendung niedrigerer Drücke und hoher Temperaturen der anpreßbaren Flächen in Verbindung mit höheren Bahnfeuchten begünstigen eine das Volumen der Bahn schonende Glättung, was hier gewünscht wird.Because a relatively low pressure is used in the long smoothing zone via the support elements can be in places of higher basis weight of the paper or cardboard web Pressure peaks largely avoided and better product quality achieved. It can due to the relatively long smoothing zone and sufficiently long dwell time of the material in the smoothing zone and thus the desired smoothness values on both sides of the web higher web speeds can be achieved. Especially the application lower pressures and high temperatures of the contact surfaces with higher web moisture levels favor smoothing that is gentle on the volume of the web, what is wanted here.

Im weiteren wird der Erfindungsgegenstand näher beschrieben und erklärt. Die Beschreibung bezieht sich auf eine Zeichnung, in welcher zeigen:

  • Fig.1 ein erstes Ausführungsbeispiel in einer dazu vorgesehenen Vorrichtung,
  • Fig. 2 und 3 weitere Vorrichtungen zum Glätten von Papier- oder Kartonbahnen,
    und
  • Fig. 4 eine weitere Vorrichtung zum Glätten von Papier- oder Kartonbahnen mit einem Stützelement.
    • The subject matter of the invention is described and explained in more detail below. The description refers to a drawing, in which:
  • 1 shows a first exemplary embodiment in a device provided for this purpose,
  • 2 and 3 further devices for smoothing paper or cardboard webs,
    and
  • Fig. 4 shows a further device for smoothing paper or cardboard webs with a support element.

    • Das Verfahren zum Glätten einer in der Bahnlaufrichtung (Pfeil) sich bewegenden Papier- oder Kartonbahn 1 vollzieht sich in mindestens einer Glättzone 2 bei einer definierten Dauer des Glättvorgangs. Das Material befindet sich in der Glättzone 2 während einer Verweilzeit, die aus der Länge der Glättzone 2 und der Bahnlaufgeschwindigkeit errechenbar ist. Während dieser entsprechend der Länge der Glättzone verlängerten Verweilzeit wird das zu glättende Material, d.h. die Papier-oder Kartonbahn einem einstellbaren Druck in der Glättzone 2 ausgesetzt. Bei einer vorteilhaften Wahl der Bedingungen kann der Druck relativ niedrig sein. Über die beiderseits der Bahn 1 angeordneten Flächen 3 und 4 kommt es zum Einsatz von Temperatur, was zusammen mit der Feuchtigkeit der Bahn 1 zur gewünschten Glättung der Bahn führt. Die Bedingungen können vorteilhaft so gewählt werden, daß keine überpreßten Stellen in einer Bahn ungleichmäßigen Flächengewichts entstehen. Dies geschieht in der verlängerten Glättzone 2, die ausreichend lang ist, um in ihr eine genügende Verweilzeit des Materials in Anbetracht der zu fahrenden Bahngeschwindigkeit zu erreichen. Die Glättzone 2 muß so lang sein, daß der gewünschte Glättvorgang während der Verweilzeit abgeschlossen und die gewünschte Glätte erreicht werden kann. Je höher die Bahnlaufgeschwindigkeit sein soll, desto länger muß im allgemeinen die Länge der Glättzone ausgestaltet werden.The method for smoothing a moving in the web running direction (arrow) Paper or cardboard web 1 takes place in at least one smoothing zone 2 at one defined duration of the smoothing process. The material is in the smoothing zone 2 during a dwell time, which is the length of the smoothing zone 2 and the Web speed can be calculated. During this according to the length of the Smoothing zone extended residence time is the material to be smoothed, i.e. the paper or Cardboard web exposed to an adjustable pressure in the smoothing zone 2. At a advantageous choice of conditions, the pressure can be relatively low. About the surfaces 3 and 4 arranged on both sides of the web 1 are used Temperature, which together with the moisture of the web 1 to the desired smoothing the train leads. The conditions can advantageously be chosen so that none overpressed areas in a web of uneven basis weight. This happens in the extended smoothing zone 2, which is long enough to have one in it sufficient dwell time of the material in view of the to be driven To achieve web speed. The smoothing zone 2 must be so long that the desired one Smoothing process completed during the dwell time and the desired smoothness reached can be. The higher the web running speed should be, the longer it has to be generally the length of the smoothing zone can be designed.

    Der Einsatz von Druck, Temperatur, Feuchtigkeit und die Länge der Glättzone werden in Abhängigkeit davon gewählt, welche Glätte an welchem Material und bei welcher Bahngeschwindigkeit erreicht werden soll.The use of pressure, temperature, humidity and the length of the smoothing zone are in Depends on which smoothness on which material and which one Web speed should be reached.

    Eine Vorrichtung, die als Beispiel in den Figuren in verschiedenen schematisch dargestellten Versionen gezeigt ist, dient zum Ausführen des erfindungsgemäßen Verfahrens. Die Vorrichtung hat eine Glättzone 2, die zwischen zwei zueinander weisenden Flächen 3 und 4 gebildet wird. Die Flächen 3 und 4 verlaufen zueinander parallel, sind beheizbar und zueinander einstellbar, so daß die Bahn 1 einem definierten Preßdruck ausgesetzt werden kann. Die Flächen 3 und 4 erstrecken sich über einen Längsabschnitt in Bahnlaufrichtung, die mit einem Pfeil angedeutet ist.A device which is shown schematically in various figures as an example shown versions is used to carry out the invention Procedure. The device has a smoothing zone 2, which is between two to each other facing surfaces 3 and 4 is formed. The surfaces 3 and 4 run towards each other parallel, are heated and adjustable to each other, so that the web 1 a defined Pressing pressure can be exposed. The areas 3 and 4 extend over a Longitudinal section in the direction of web travel, which is indicated by an arrow.

    Nach dem Ausführungsbeispiel gemäß Fig. 1 ist die eine Fläche 3 ein Mantel 5 einer Walze 6. Die zweite Fläche 4 wird mittels eines endlosen, flexiblen Bandes 7 gebildet. Das Band 7 ist in Richtung zu dem Walzenmantel 5 mittels eines anpreßbaren Stützelementes 8 abgestützt. Dieses weist eine zum Band 7 konkave Abstützfläche auf, die zu dem Radius des Walzenmantels 5 komplementär ausgebildet ist. Der Mantel 5 der Walze 6 und das Band 7 sind mit der gleichen Geschwindigkeit antreibbar wie die Laufgeschwindigkeit der Bahn 1. Wenn es technologisch gewünscht ist, können auch Differenzgeschwindigkeiten angewendet werden.According to the exemplary embodiment according to FIG. 1, one surface 3 is a jacket 5 Roller 6. The second surface 4 is formed by an endless, flexible belt 7. The belt 7 is in the direction of the roll shell 5 by means of a press-on Support element 8 supported. This has a support surface concave to the band 7, which is complementary to the radius of the roll shell 5. The coat 5 of the Roller 6 and the belt 7 can be driven at the same speed as that Running speed of the web 1. If it is technologically desired, you can Differential speeds can be applied.

    Anstelle des Mantels 5 der Walze 6 kann auch ein flexibles Band 19 verwendet werden, das auf bekannte, hier nicht gezeichnete Weise über Rollwalzen geführt ist und in der Glättzone 2 zu einer konvexen Form mittels eines Stützelementes 18 geformt wird. Die konvexe Abstützfläche ist komplementär ausgebildet zu der gegenüberliegend angeordneten konkaven Fläche des Stützelementes 8. Bei Verwendung eines Metallbandes hat dieses den Vorteil einer guten Beheizbarkeit. Eine z.B. Induktionsheizung für das Band 19 ist in Fig. 1 angedeutet und mit 20 bezeichnet. Eine andere einsetzbare Vorrichtung, z.B. zur Beheizung mit Dampf oder Heißluft ist auch in Fig. 1 angedeutet und mit 21 bezeichnet. Dieses käme vorteilhafterweise besonders dann zur Anwendung, wenn es sich um ein Nichtmetall-Band 19 handelte.Instead of the jacket 5 of the roller 6, a flexible belt 19 can also be used, which is guided in a known manner, not shown here, over rolling rollers and in the Smoothing zone 2 is formed into a convex shape by means of a support element 18. The convex support surface is complementary to the opposite arranged concave surface of the support element 8. When using a metal strip has the advantage of good heatability. A e.g. Induction heating for that Volume 19 is indicated in Fig. 1 and designated 20. Another usable Device, e.g. for heating with steam or hot air is also indicated in Fig. 1 and designated 21. This would particularly advantageously be used if it was a non-metal tape 19.

    Der anzuwendende Druck in der Glättzone 2 ist durch das Einstellen des Druckes im Druckmedium des Stützelementes 8 bzw. der Stützelemente 8 und 18 erzeugbar. Die Oberflächentemperatur der Glättfläche ist mittels der Vorrichtungen 20 bzw. 21 einstellbar. Die Feuchtigkeit ist gegeben durch die Feuchte der zu behandelnden Bahn 1. Die flexiblen Bänder sind dicht, d.h. undurchlässig, und zwischen dem Band und der Abstützfläche des Stützelements ist eine Flüssigkeitsschicht vorgesehen, die auf hydrostatische und/oder hydrodynamische Weise aufgebaut wird. Sie sorgt für reibungsarmen Lauf des Bandes entlang der Abstützflächen. Die Flüssigkeit könnte zum Beheizen wie auch zum Kühlen temperiert werden. Die Stützelemente können an sich bekannte Gleitschuhe sein, wobei eine Flüssigkeit zwischen die Abstützfläche und das Band eingeführt wurde. Die Stützelemente können auch an sich bekannte hydrostatische Stützelemente sein. Ihre Drucktaschen könnten ebenso mit einer heizenden oder kühlenden Flüssigkeit gespeist werden. Mit diesen Stützelementen kann also sowohl der Druck, wie auch die Temperatur in der Glättzone 2 nach Bedarf, wenn gewünscht, auch abgestuft, eingestellt werden.Wenn z.B. ein Glättspalt nicht ausreichen sollte, ist es von Vorteil, 2 Glättzonen hintereinander anzuordnen, etwa wie es in Fig. 1 gezeigt ist. Wird in einer Glättzone jeweils nur eine Fläche beheizt, dann ist es zweckmäßig, die gegenüberliegenden zu heizen, so daß die beiden Seiten der Bahn nacheinander an je einer Fläche geglättet werden.The pressure to be applied in the smoothing zone 2 is determined by adjusting the pressure in the Pressure medium of the support element 8 or the support elements 8 and 18 can be generated. The Surface temperature of the smoothing surface is by means of devices 20 and 21, respectively adjustable. The moisture is given by the moisture of the web 1 to be treated. The flexible tapes are tight, i.e. impermeable, and between the tape and the A support layer of the support element is provided, which is a liquid layer is built hydrostatic and / or hydrodynamic manner. It takes care of low-friction running of the belt along the support surfaces. The liquid could Heating and temperature control for cooling. The support elements can in themselves be known sliding shoes, with a liquid between the support surface and the Tape was introduced. The support elements can also be known hydrostatic Be support elements. Your pressure bags could also be with a heating or cooling liquid. With these support elements both Pressure as well as the temperature in the smoothing zone 2 as required, if desired graded, adjusted, e.g. if a smoothing gap should not be enough it is advantageous to have 2 smoothing zones to be arranged one behind the other, for example as shown in FIG. 1. Will be in a smoothing zone each heated only one surface, then it is expedient to face the opposite heat so that the two sides of the web are smoothed one after the other on one surface become.

    Eine weitere Vorrichtung zum Glätten von Papier- oder Kartonbahnen sieht endlose, flexible Bänder 7 vor, die die beiden Flächen 3 und 4 bilden.Another device for smoothing paper or cardboard webs sees Endless, flexible bands 7 before, which form the two surfaces 3 and 4.

    Die Bänder sind durch zueinander einstellbare Stützelemente 9, siehe Fig. 2 und 4, abgestützt, die jeweils eine ebene dem Band 7 zugewandte Abstützfläche aufweisen. Sie sind zueinander auf bekannte Weise definiert anpreßbar. Obzwar hier hydrostatische Stützelemente gezeichnet sind, sind auch Gleitschuhe von bekannter Art anwendbar. Zwischen jedem Band 7 und der ebenen Abstützfläche des Stützelementes 9 ist eine Flüssigkeitsschicht vorgesehen, welche im Beispiel gemäß Fig. 2 hydrostatisch aufgebaut wird. Dazu weist das Stützelement zum Band 7 geöffnete Drucktaschen 23 auf, die mit einem Druckmedium beaufschlagbar sind, gegebenenfalls zum Beheizen oder Kühlen temperiert. Es ist auch möglich, die Flüssigkeitsschicht auf hydrodynamische Weise aufzubauen, wie das z.B. in Fig. 3 an der Fläche 3 der Fall sein könnte.The bands are supported by mutually adjustable support elements 9, see FIGS. 2 and 4, supported, each facing a flat band 7 Have support surface. They can be pressed against one another in a known manner in a defined manner. Although hydrostatic support elements are drawn here, sliding shoes are also from known type applicable. Between each band 7 and the flat support surface of the Support element 9, a liquid layer is provided, which in the example according to FIG. 2 is built hydrostatically. For this purpose, the support element faces the band 7 Pressure pockets 23, which can be acted upon with a pressure medium, if necessary tempered for heating or cooling. It is also possible to apply the liquid layer to build hydrodynamic ways, such as in Fig. 3 on the surface 3 be the case could.

    In der Vorrichtung gemäß Fig. 3 wird die eine Fläche 3 mittels eines dichten, undurchlässigen Bandes 7 gebildet. Die zweite Fläche 4 wird durch eine der Bahn 1 anliegende Wand 12 gebildet, die einen Druckraum eines kastenförmigen, gegen die Bahn 1 einstellbaren Stützelements 13 begrenzt. Die Wand 12 ist ausgeführt zum Durchlassen eines gasförmigen Mediums, welches unter Druck durch eine Leitung 22 in den Druckraum unter der Wand einführbar ist. Das Stützelement ist in einem Träger 24 kolbenartig eingebettet, wobei ein Druckraum 25 vorgesehen ist, der mit einem Druckmedium beaufschlagbar ist zum Anpressen des Stützelementes in Richtung zu der Bahn 1. Zwischen der Wand 12 und der Bahn 1 bildet sich eine Gasschicht, die durch das gas- bzw. dampfförmige Medium aufgebaut wird. Eine weitere Abwandlung ist denkbar, bei der der Druckraum 25 ebenfalls mit einem gas- bzw. dampfförmigen Medium versorgt wird, das von dort durch eine oder mehrere Bohrungen 22′ zu dem Druckraum unter der Wand 12 gelangen kann (Fig. 4).In the device according to FIG. 3, one surface 3 is covered by a dense, impermeable band 7 formed. The second surface 4 is covered by one of the webs 1 adjacent wall 12 formed which is a pressure chamber of a box-shaped, against the web 1 adjustable support element 13 limited. The wall 12 is designed for Passing a gaseous medium, which under pressure through a line 22 in the pressure chamber can be inserted under the wall. The support element is in a carrier 24 embedded like a piston, a pressure chamber 25 being provided which is connected to a Pressure medium can be applied to press the support element in the direction of the Lane 1. Between the wall 12 and the lane 1, a gas layer is formed, which through the gaseous or vaporous medium is built up. Another modification is conceivable in which the pressure chamber 25 also with a gaseous or vaporous medium is supplied from there through one or more holes 22 'to the pressure chamber can get under the wall 12 (Fig. 4).

    Claims (4)

    1. Method for smoothing a web (1) of paper or card in a smoothing zone (2) during a period of the smoothing operation, which is predetermined by the dwell time of the web (1) in the smoothing zone, wherein one operates in the smoothing zone with pressure using temperature and moisture, and wherein the desired smoothness is achieved in an appropriately long dwell time of the material to be smoothed in a correspondingly long smoothing zone, wherein
      a still moist web (1) is guided between parallel, heatable surfaces (3, 4), which can each be pressed against the web and which are arranged on either side of the web and face the web,
      at least one of the surfaces (3, 4) is heated,
      the surfaces (3, 4) are pressed against the web (1) and are designed to form and hold a predetermined defined contour of the smoothing zone (2) over the full length thereof, wherein the one surface (3) is formed by a jacket (5) of a roll (6) and the second surface (4) is formed by an endless and flexible belt (7), which is supported in the direction towards the roller jacket (5) by means of a support element (8) which is formed as a pressing shoe, is provided with a concave support surface made complementary to the radius of the roll jacket (5) and can be pressed by pressure loading towards the belt (7),
      and the flexible belt (7) is areally pressed against the web (1) by the pressing shoe.
    2. Method in accordance with claim 1, characterized in that the jacket (5) of the roll (6) and the flexible belt (7) are driveable with a speed equal to the web running speed.
    3. Method in accordance with one of the claims 1 or 2, characterized by the use of an impermeable, endless, flexible belt (7) and by the formation of a liquid layer (11) between the belt (7) and the surface (10) of the support element (9) confronting the belt (7), the liquid layer being built up in hydrodynamic and/or hydrostatic manner.
    4. Method in accordance with one of the preceding claims, characterized by the use of support elements which are arranged in at least two rows following one another in the web running direction.
    EP89116409A 1988-10-31 1989-09-06 Process for smoothing a paper or cardboard web Expired - Lifetime EP0370185B2 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    AT89116409T ATE76134T1 (en) 1988-10-31 1989-09-06 METHOD OF FADERING A WEB OF PAPER OR CARDBOARD.

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    CH4045/88 1988-10-31
    CH404588 1988-10-31
    CH404588 1988-10-31

    Publications (3)

    Publication Number Publication Date
    EP0370185A1 EP0370185A1 (en) 1990-05-30
    EP0370185B1 EP0370185B1 (en) 1992-05-13
    EP0370185B2 true EP0370185B2 (en) 2000-01-19

    Family

    ID=4268786

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP89116409A Expired - Lifetime EP0370185B2 (en) 1988-10-31 1989-09-06 Process for smoothing a paper or cardboard web

    Country Status (4)

    Country Link
    US (1) US5163364A (en)
    EP (1) EP0370185B2 (en)
    AT (1) ATE76134T1 (en)
    DE (1) DE3920204A1 (en)

    Cited By (5)

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    DE10157690C1 (en) * 2001-11-24 2003-02-20 Voith Paper Patent Gmbh Calender assembly with a wide nip, to polish the surfaces of paper/cardboard webs, has a steam jet aligned at the web on leaving the nip to increased the polished surface effects
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    DE10206027C2 (en) * 2002-02-14 2003-12-11 Voith Paper Patent Gmbh Calender and method for smoothing a fibrous web
    DE102010030327A1 (en) 2010-06-22 2011-12-22 Voith Patent Gmbh Web treatment device for smoothing fibrous web, particularly paper or cardboard web, has contact zone formed by treatment element and flexible sheath, where sheath is formed in concave manner in contact zone between longitudinal sealings

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    ATE76134T1 (en) 1992-05-15
    DE3920204C2 (en) 1991-04-11
    EP0370185B1 (en) 1992-05-13
    EP0370185A1 (en) 1990-05-30
    DE3920204A1 (en) 1990-05-10
    US5163364A (en) 1992-11-17

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