EP2314763B1 - Method for processing a sheet of fibrous material - Google Patents

Method for processing a sheet of fibrous material Download PDF

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Publication number
EP2314763B1
EP2314763B1 EP20100169353 EP10169353A EP2314763B1 EP 2314763 B1 EP2314763 B1 EP 2314763B1 EP 20100169353 EP20100169353 EP 20100169353 EP 10169353 A EP10169353 A EP 10169353A EP 2314763 B1 EP2314763 B1 EP 2314763B1
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EP
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Prior art keywords
pressure element
shoe
pressure
fibrous web
web
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EP20100169353
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German (de)
French (fr)
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EP2314763A1 (en
Inventor
Shulei Dr.-Ing. Zhao
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Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • 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 device for treating a fibrous web, in which it can be pressed against a heatable counter-pressure element, in particular a heatable roller with a circumferential jacket or a circulating belt, wherein the contact pressure can be applied by a shoe, with a contact surface from the inside against the sheath or the band acts, whereby the sheath or the band with the counter roll form a contact zone for the fibrous web, which contact zone in the direction of the fibrous web has a length of at least 100 mm and varies over the length of the contact pressure.
  • a heatable counter-pressure element in particular a heatable roller with a circumferential jacket or a circulating belt
  • the contact pressure can be applied by a shoe, with a contact surface from the inside against the sheath or the band acts, whereby the sheath or the band with the counter roll form a contact zone for the fibrous web, which contact zone in the direction of the fibrous web has a length of at least 100 mm and varies over the length of
  • Such a device is widely used for dewatering or calendering of paper or board webs.
  • a change in the pressure curve in the running direction of the fibrous web is generated for example by tilting the shoe. From the DE 4410129 It is known to curve the shoe to vary the pressure curve.
  • the length of the contact zone comprises a at the beginning longer, at least over half reaching heating section with low pressure and at least one following very short pulse path of high pressure.
  • the heating section is dimensioned and designed in terms of temperature so that the surface of the web reaches the Tg point, ie the melting temperature of the fibers.
  • the interior of the railway in the thickness direction it essentially retains the temperature with which it entered the device.
  • the pulse path is designed so that the surface is compacted and smoothed to the desired extent in it. This design is easy for a person skilled in the art, because the momentum corresponds to that in a conventional calender nip. Should he not be known for certain types of fibrous webs, he is in a simple way in the attempt to clarify.
  • the low pressure of the heating section is less than 2 MPa.
  • the energy input in the form of pressure in the device is kept small in this way. In this case, a pressure of less than 2 MPa is sufficient to ensure the necessary heat transfer. Care should be taken that the surface temperature of the counter-pressure element, in particular a heating roller, is better than 180 ° C, at least above 150 ° C.
  • the pulse path is determined by an additional pressure element, which is in communication with the shoe.
  • the heating section and the pulse path are thus united in the one shoe.
  • the total shoe length in the direction of the fibrous web of more than 100 mm is divided so that the first and by far the largest part serves to heat the web.
  • the web is acted upon by an additional pressure element with a pulse, which makes the final and final compression.
  • the pressure element is arranged in the running direction of the fibrous web at the end of the shoe.
  • the pressure element is mounted in the contact surface of the shoe. This ensures a stable position of the usually narrow compared to the dimensions of the shoe pressure element.
  • the pressure element is a rotational body.
  • the sliding over the pressure element jacket or the belt running over it is thereby subjected to a significantly lower wear, since the rotational body with a peripheral speed of the same order of magnitude we can turn the belt or the shell. A rubbing relative movement is thus avoided. This increases the service life of the belt or jacket.
  • the rotational body is mounted in a storage space on a lubricating film and can rotate freely.
  • the lubricating film is pressed under pressure into a space in the shoe, in which the rotational body is mounted.
  • the rotating body can rotate freely there without friction stress fluid-bearing.
  • the pressure element extends over the width of the fibrous web. It may be in connection with a sheet-wide shoe or extend over several axially adjacent shoes. The fact that the pressure element extends across the width of the web, it is ensured that the pressure pulse across the entire web is the same and not interrupted. In this way, a qualitatively uniformly compressed and smoothed fibrous web is produced.
  • the pressure element or at least a part thereof protrudes 0.001 to 1 mm beyond the contact surface in the direction of the belt or jacket.
  • a supernatant in this size range has proven to be effective.
  • the high pressure of the pulse path is higher than 10 MPa. Then, the operator of the device according to the invention achieves a calendering of the fibrous web, which would otherwise be producible only with a multi-roll calender.
  • the figure shows a schematic sectional view of a device according to the invention for treating a fibrous web.
  • the device 1 has a shoe 2 and a counter-pressure element 3.
  • the counter-pressure element 3 is in this embodiment, a heated to above 150 ° C, preferably to about 180 ° C roller.
  • the shoe has a contact surface 10 which is concavely curved to the contour of the counter-pressure element 3.
  • the shoe 2 is able to press a circulating belt or a circumferential jacket 4 against the counter-pressure element. The possibilities of pressing such shoes are known in the art and need not be further explained here.
  • the fibrous web 5 is treated under pressure and temperature influence.
  • the directions of movement of the belt or casing 4, counter-pressure element 3 and fibrous web 5 are indicated by arrows in the figure.
  • a lubricant supply 9 is provided, which introduces lubricant into the gap between jacket or band 4 and shoe 2.
  • nozzles are provided which provide a hydrodynamic lubricant film.
  • the invention also does not exclude to hydrostatically lubricate the shoe surface in a known manner.
  • the heating path which extends at least over the first half of the contact surface 10 of the shoe 2, the web is applied against the heated counter-pressure element 3 with a moderate pressure below 2 MPa.
  • the heating section 11 should therefore be at least 50 mm long.
  • the surface of the web 5 is heated so that you can easily smooth and compact.
  • the exposure time is calculated precisely so that the interior of the web 5 substantially retains its inlet temperature before entering the device 1, before the web 5 enters the downstream pulse path 12.
  • the pulse path has a pressure element 6, which exerts an increased pressure pulse on the belt or the jacket 4.
  • the pressure element 6 can extend over the web width and protrudes slightly from the contact surface 10.
  • the pressure pulse is transmitted through the jacket or the band to the paper web 5, which is pressed at this point with a pressure greater than 10 MPa against the counter-pressure element 3. As a result, the web is compressed on its surface and smoothed.
  • the storage space 8 corresponds to a longitudinally-cut cylinder cavity, the inner diameter of which is only slightly larger than the outer diameter of the rotational body.
  • the calendering process can be assisted by moistening devices (steam, nozzle moistener) in front of the device 1 according to the invention.

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  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Behandlung einer Faserstoffbahn, in der diese mit einem umlaufenden Mantel oder einem umlaufenden Band gegen ein beheizbares Gegendruckelement, insbesondere eine beheizbare Walze, anpressbar ist, wobei der Anpressdruck durch einen Schuh aufbringbar ist, der mit einer Anlagefläche von innen gegen den Mantel oder das Band wirkt, wodurch der Mantel oder das Band mit der Gegenwalze eine Kontaktzone für die Faserstoffbahn bilden, welche Kontaktzone in Laufrichtung der Faserstoffbahn eine Länge von wenigstens 100 mm aufweist und über deren Länge der Anpressdruck variiert.The invention relates to a device for treating a fibrous web, in which it can be pressed against a heatable counter-pressure element, in particular a heatable roller with a circumferential jacket or a circulating belt, wherein the contact pressure can be applied by a shoe, with a contact surface from the inside against the sheath or the band acts, whereby the sheath or the band with the counter roll form a contact zone for the fibrous web, which contact zone in the direction of the fibrous web has a length of at least 100 mm and varies over the length of the contact pressure.

Eine solche Vorrichtung wird vielfach zur Entwässerung oder Satinage von Papier- oder Kartonbahnen verwendet. Eine Veränderung des Druckverlaufs in Laufrichtung der Faserstoffbahn wird beispielsweise durch ein Kippen des Schuhs erzeugt. Aus der DE 4410129 ist es bekannt, den Schuh zu krümmen, um den Druckverlauf zu variieren.Such a device is widely used for dewatering or calendering of paper or board webs. A change in the pressure curve in the running direction of the fibrous web is generated for example by tilting the shoe. From the DE 4410129 It is known to curve the shoe to vary the pressure curve.

Neben dem Druckverlauf im Nip ist der Temperatureinfluss, insbesondere bei der Satinage, von entscheidender Bedeutung. Dabei ist spätestens seit einem Artikel in der Zeitschrift " Tappi Journal"/October 1982 von R. H. Crotogino der Fachwelt bekannt, welche Möglichkeiten mit dem "Temperature Gradient Calendering" geboten werden. Hierbei kommt eine relativ kalte Papierbahn mit sehr heißen Walzen (> 150°C Oberflächentemperatur) in Kontakt. Durch das entstehende starke Temperaturgefälle in Dickenrichtung der Faserstoffbahn von der Oberfläche zur Mitte der Bahn, werden die äußeren heißen Fasern mehr verdichtet als die innen liegenden kühleren Fasern. Trotz des gleichzeitig aufgebrachten Drucks im Walzennip wird das Volumen der Bahn deutlich geschont gegenüber herkömmlichen Satinageverfahren, bei denen die Bahn weitgehend durchgewärmt war. Außerdem zeigte sich überraschend, dass auch das Satinageergebnis in Glanz und Glätte besser war. Aus dem Bericht von Crotogino ist noch zu entnehmen, dass seine Versuche mit Bahngeschwindigkeiten von maximal 730 m/min und Streckenlasten in Höhe von 105 kN/m (das entspricht Druckspannungen im Nip von wenigstens 5 MPa) durchgeführt wurden.In addition to the pressure curve in the nip, the influence of temperature, especially in the case of calendering, is of crucial importance. It is at least since an article in the magazine " Tappi Journal "/ October 1982 by RH Crotogino the experts know what options are offered with the "Temperature Gradient Calendering". In this case, a relatively cold paper web comes into contact with very hot rolls (> 150 ° C. surface temperature). Due to the resulting strong temperature gradient in the thickness direction of the fibrous web from the surface to the center of the web, the outer hot fibers are more compressed than the inner cooler fibers. Despite the simultaneously applied pressure in the roll nip, the volume of the web is clearly spared compared to conventional calendering processes in which the web was largely thoroughly warmed. It also showed Surprising that the calendering result in gloss and smoothness was better. It can be seen from the Crotogino report that its tests were carried out with web speeds of up to 730 m / min and line loads of 105 kN / m (corresponding to compressive stresses in the nip of at least 5 MPa).

Bei den heutigen schnell laufenden Maschinen funktioniert die starke Aufwärmung der Deckschicht nicht mehr zufriedenstellend. Ein Walzennip ist zu kurz, um die notwendige Wärmeenergie für ein "Temperature Gradient Calendering" zu übertragen. Aus diesem Grund müssen mehrere Walzennips hintereinander geschaltet sein. Ein alternatives Ausweichen auf einen verlängerten Schuhnip bringt zwar bereits Vorteile, aber es fehlen dann die notwenigen Druckspannungen zur Oberflächenverdichtung.In today's fast-running machines, the strong warming of the top layer does not work satisfactorily. A roll nip is too short to transfer the necessary heat energy for temperature gradient calendering. For this reason, several roll nips must be connected in series. An alternative evasion to an extended Schuhnip already brings benefits, but it lacks the necessary compressive stresses for surface compaction.

Es ist die Aufgabe der Erfindung, das Prinzip des "Temperature Gradient Calenderings" auch bei den heutigen hohen Faserstoffbahngeschwindigkeiten oberhalb von 1600 m/min praktikabel zu machen.It is the object of the invention to make the principle of "temperature gradient calendering" practicable even at today's high fibrous web speeds above 1600 m / min.

Die Aufgabe wird dadurch gelöst, dass die Länge der Kontaktzone eine zu Beginn längere, zumindest über die Hälfte reichende Aufheizstrecke mit geringem Druck und wenigstens eine folgende sehr kurze Impulsstrecke hohen Drucks umfasst.The object is achieved in that the length of the contact zone comprises a at the beginning longer, at least over half reaching heating section with low pressure and at least one following very short pulse path of high pressure.

Durch die Trennung der Aufheizstrecke und somit der Aufheizphase von der Impulsstrecke und somit der Verdichtungsphase kann die gewünschte "Temperature Gradient Calendering"-Behandlung zufriedenstellend durchgeführt werden. Die Heizstrecke wird dabei so bemessen und temperaturmäßig ausgelegt, dass die Oberfläche der Bahn den Tg-Punkt, also die Anschmelztemperatur der Fasern, erreicht. Das Innere der Bahn in Dickenrichtung behält dabei im Wesentlichen die Temperatur, mit der sie in die Vorrichtung eintrat. Die Impulsstrecke ist so ausgelegt, dass in ihr die Oberfläche im gewünschten Maß verdichtet und geglättet wird. Diese Auslegung fällt einem Fachmann leicht, denn der Impuls entspricht demjenigen in einem herkömmlichen Kalandernip. Sollte er für bestimmte Faserstoffbahnsorten nicht bekannt sein, so ist er auf einfache Weise im Versuch zu klären.By separating the heating path and thus the heating phase of the pulse path and thus the compression phase, the desired "Temperature Gradient Calendering" treatment can be carried out satisfactorily. The heating section is dimensioned and designed in terms of temperature so that the surface of the web reaches the Tg point, ie the melting temperature of the fibers. The interior of the railway in the thickness direction, it essentially retains the temperature with which it entered the device. The pulse path is designed so that the surface is compacted and smoothed to the desired extent in it. This design is easy for a person skilled in the art, because the momentum corresponds to that in a conventional calender nip. Should he not be known for certain types of fibrous webs, he is in a simple way in the attempt to clarify.

Es ist von Vorteil, wenn der geringe Druck der Aufheizstrecke unter 2 MPa liegt. Der Energieeintrag in Form von Druck in die Vorrichtung wird auf diese Weise klein gehalten. Dabei ist ein Druck von unter 2 MPa ausreichend, um den notwendigen Wärmeübergang sicher zu stellen. Es sollte darauf geachtet werden, dass die Oberflächentemperatur des Gegendruckelementes, insbesondere einer Heizwalze, zumindest bei über 150°C, besser bei über 180°C liegt.It is advantageous if the low pressure of the heating section is less than 2 MPa. The energy input in the form of pressure in the device is kept small in this way. In this case, a pressure of less than 2 MPa is sufficient to ensure the necessary heat transfer. Care should be taken that the surface temperature of the counter-pressure element, in particular a heating roller, is better than 180 ° C, at least above 150 ° C.

Vorzugsweise wird die Impulsstrecke durch ein zusätzliches Druckelement, das in Verbindung mit dem Schuh steht, bestimmt. Die Heizstrecke und die Impulsstrecke werden somit in dem einen Schuh vereint. Die Gesamtschuhlänge in Laufrichtung der Faserstoffbahn von über 100 mm wird so aufgeteilt, dass der erste und weitaus größte Teil zum Aufheizen der Bahn dient. Zum Schluss wird die Bahn durch ein zusätzliches Druckelement mit einem Impuls beaufschlagt, der die endgültige und abschließende Verdichtung vornimmt.Preferably, the pulse path is determined by an additional pressure element, which is in communication with the shoe. The heating section and the pulse path are thus united in the one shoe. The total shoe length in the direction of the fibrous web of more than 100 mm is divided so that the first and by far the largest part serves to heat the web. Finally, the web is acted upon by an additional pressure element with a pulse, which makes the final and final compression.

Aus diesem Grund ist es auch günstig, wenn das Druckelement in Laufrichtung der Faserstoffbahn am Ende des Schuhs angeordnet ist. Mit Vorteil ist dafür gesorgt, dass das Druckelement in der Anlagefläche des Schuhs gelagert ist. Dadurch wird eine stabile Lage des in der Regel verglichen mit den Ausmaßen des Schuhs schmalen Druckelementes gewährleistet.For this reason, it is also advantageous if the pressure element is arranged in the running direction of the fibrous web at the end of the shoe. Advantageously, it is ensured that the pressure element is mounted in the contact surface of the shoe. This ensures a stable position of the usually narrow compared to the dimensions of the shoe pressure element.

Besonders bevorzugt ist das Druckelement ein Rotationskörper. Der über das Druckelement hinweggleitende Mantel oder das sich darüber laufende Band wird dadurch einem deutlich geringeren Verschleiß unterworfen, da sich der der Rotationskörper mit einer Umfangsgeschwindigkeit in der gleichen Größenordnung wir die des Bandes oder des Mantels drehen kann. Eine reibende Relativbewegung wird so vermieden. Das erhöht die Standzeit von Band bzw. Mantel.Particularly preferably, the pressure element is a rotational body. The sliding over the pressure element jacket or the belt running over it is thereby subjected to a significantly lower wear, since the rotational body with a peripheral speed of the same order of magnitude we can turn the belt or the shell. A rubbing relative movement is thus avoided. This increases the service life of the belt or jacket.

Um zusätzlich die Reibungsverlusten und -beanspruchungen an der Rotationskörper-Lagerung zu vermeiden ist mit Vorteil vorgesehen, dass der Rotationskörper in einem Lagerungsraum auf einem Schmierfilm gelagert ist und frei rotieren kann. Der Schmierfilm wird dabei unter Druck in einen Raum im Schuh gepresst, in dem der Rotationskörper gelagert ist. Der Rotationskörper kann dort ohne Reibbeanspruchung flüssigkeitsgelagert frei rotieren.In order additionally to avoid the friction losses and stresses on the rotational body bearing is provided with advantage that the rotational body is mounted in a storage space on a lubricating film and can rotate freely. The lubricating film is pressed under pressure into a space in the shoe, in which the rotational body is mounted. The rotating body can rotate freely there without friction stress fluid-bearing.

Bevorzugt erstreckt das Druckelement sich über die Breite der Faserstoffbahn. Es kann dabei in Verbindung mit einem bahnbreiten Schuh stehen oder sich über mehrere axial aneinandergrenzende Schuhe erstrecken. Dadurch, dass das Druckelement über die Breite der Bahn reicht, wird gewährleistet, dass der Druckimpuls über die gesamte Bahn gleich und nicht unterbrochen ist. Auf diese Weise wird eine qualitativ einheitlich verdichtete und geglättete Faserstoffbahn erzeugt.Preferably, the pressure element extends over the width of the fibrous web. It may be in connection with a sheet-wide shoe or extend over several axially adjacent shoes. The fact that the pressure element extends across the width of the web, it is ensured that the pressure pulse across the entire web is the same and not interrupted. In this way, a qualitatively uniformly compressed and smoothed fibrous web is produced.

Es ist von Vorteil, wenn das Druckelement oder wenigstens ein Teil davon 0,001 bis 1 mm über die Anlagefläche in Richtung Band oder Mantel hinaussteht. Je nach Faserstoffbahnsorte und Band- bzw. Mantelmaterial hat sich ein Überstand in diesem Größenbereich als wirkungsvoll erwiesen. Gängige Mantel- bzw. Bandmaterialien aus Kunststoff oder Metall können den Impuls, den das Druckelement bewirkt so auf die Faserstoffbahn weitergeben, dass dort ein für die Erfindung wichtiger Wirkdruck von 5 bis 40 MPa ankommt.It is advantageous if the pressure element or at least a part thereof protrudes 0.001 to 1 mm beyond the contact surface in the direction of the belt or jacket. Depending on the type of fibrous web and the band or sheath material, a supernatant in this size range has proven to be effective. Common sheath or strip materials made of plastic or metal, the impulse that causes the pressure element so on the Pass pulp web that there is important for the invention effective pressure of 5 to 40 MPa.

Besonders günstig ist es, wenn der hohe Druck der Impulsstrecke höher als 10 MPa ist. Dann erzielt der Betreiber der erfindungsgemäßen Vorrichtung eine Satinage der Faserstoffbahn, die ansonsten nur mit einem Mehrwalzenkalander erzeugbar wäre.It is particularly favorable if the high pressure of the pulse path is higher than 10 MPa. Then, the operator of the device according to the invention achieves a calendering of the fibrous web, which would otherwise be producible only with a multi-roll calender.

Die Erfindung wird im Folgenden anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher erläutert. In dieser zeigt die Figur eine schematische Ausschnittsdarstellung einer erfindungsgemäßen Vorrichtung zur Behandlung einer Faserstoffbahn.The invention will be explained in more detail below with reference to an embodiment with reference to the drawing. In the figure, the figure shows a schematic sectional view of a device according to the invention for treating a fibrous web.

Die Vorrichtung 1 besitzt einen Schuh 2 und ein Gegendruckelement 3. Das Gegendruckelement 3 ist in diesem Ausführungsbeispiel eine auf über 150°C, vorzugsweise auf über 180°C beheizbare Walze. Der Schuh besitzt eine Anpressfläche 10, die an die Kontur des Gegendruckelementes 3 angepasst konkav gekrümmt ist.
Der Schuh 2 ist in der Lage, ein umlaufendes Band oder einen umlaufenden Mantel 4 gegen das Gegendruckelement zu pressen. Die Möglichkeiten der Anpressung solcher Schuhe sind dem Fachmann bekannt und müssen hier nicht weiter erläutert werden.The device 1 has a shoe 2 and a counter-pressure element 3. The counter-pressure element 3 is in this embodiment, a heated to above 150 ° C, preferably to about 180 ° C roller. The shoe has a contact surface 10 which is concavely curved to the contour of the counter-pressure element 3.
The shoe 2 is able to press a circulating belt or a circumferential jacket 4 against the counter-pressure element. The possibilities of pressing such shoes are known in the art and need not be further explained here.

Zwischen dem Mantel oder Band 4 und dem Gegendruckelement 3 wird die Faserstoffbahn 5 unter Druck- und Temperatureinfluss behandelt. Die Bewegungsrichtungen von Band bzw. Mantel 4, Gegendruckelement 3 und Faserstoffbahn 5 sind durch Pfeile in der Figur gekennzeichnet.Between the jacket or band 4 and the counter-pressure element 3, the fibrous web 5 is treated under pressure and temperature influence. The directions of movement of the belt or casing 4, counter-pressure element 3 and fibrous web 5 are indicated by arrows in the figure.

Man möchte die Bahn 5 in der Vorrichtung 1 ähnlich dem "Moisture Gradient Calendering"-Verfahren behandeln. Dazu umfasst die Kontaktzone 13, in der die Faserstoffbahn zwischen Gegendruckelement 3 und Band oder Mantel 4 behandelt wird, eine Heizstrecke 11, der eine Impulsstrecke 12 folgt.One would like to treat the web 5 in the device 1 similar to the "Moisture Gradient Calendering" method. For this purpose, the contact zone 13, in which the fibrous web between counter-pressure element 3 and band or sheath 4 is treated, a heating section 11, which follows a pulse path 12.

Um die Reibung des Bandes oder des Mantels 4 auf der Schuhoberfläche gering zu halten, ist eine Schmiermittelzufuhr 9 vorgesehen, die Schmiermittel in den Spalt zwischen Mantel bzw. Band 4 und Schuh 2 einbringt. Im Ausführungsbeispiel sind dazu Düsen vorgesehen, die für einen hydrodynamischen Schmierfilm sorgen. Die Erfindung schließt aber auch nicht aus, die Schuhoberfläche in bekannter Art hydrostatisch zu schmieren.In order to keep the friction of the band or the jacket 4 on the shoe surface low, a lubricant supply 9 is provided, which introduces lubricant into the gap between jacket or band 4 and shoe 2. In the exemplary embodiment, nozzles are provided which provide a hydrodynamic lubricant film. However, the invention also does not exclude to hydrostatically lubricate the shoe surface in a known manner.

In der Heizstrecke, die sich zumindest über die erste Hälfte der Anlagefläche 10 des Schuhs 2 erstreckt, wird mit einem moderaten Druck unter 2 MPa die Bahn gegen das beheizte Gegendruckelement 3 angelegt. Bei einer Schuhlänge von in Faserbahnlaufrichtung mindestens 100 mm soll die Heizstrecke 11 demnach mindestens 50 mm lang sein. In dieser Heizstrecke 11 wird die Oberfläche der Bahn 5 derart erwärmt, dass man sie leicht glätten und verdichten kann. Die Einwirkzeit wird aber genau so bemessen, dass das Innere der Bahn 5 im Wesentlichen seine Einlauftemperatur vor dem Eintritt in die Vorrichtung 1 behält, bevor die Bahn 5 in die nachgeschaltete Impulsstrecke 12 einfährt.In the heating path, which extends at least over the first half of the contact surface 10 of the shoe 2, the web is applied against the heated counter-pressure element 3 with a moderate pressure below 2 MPa. At a shoe length of at least 100 mm in fiber web running direction, the heating section 11 should therefore be at least 50 mm long. In this heating section 11, the surface of the web 5 is heated so that you can easily smooth and compact. However, the exposure time is calculated precisely so that the interior of the web 5 substantially retains its inlet temperature before entering the device 1, before the web 5 enters the downstream pulse path 12.

Die Impulsstrecke besitzt ein Druckelement 6, das auf das Band bzw. den Mantel 4 einen erhöhten Druckimpuls ausübt. Das Druckelement 6 kann sich über die Bahnbreite erstrecken und steht etwas aus der Anlagefläche 10 vor. Der Druckimpuls überträgt sich durch den Mantel bzw. das Band auf die Papierbahn 5, die an dieser Stelle mit einem Druck größer als 10 MPa gegen das Gegendruckelement 3 gepresst wird. Dadurch wird die Bahn an ihrer Oberfläche komprimiert und geglättet.The pulse path has a pressure element 6, which exerts an increased pressure pulse on the belt or the jacket 4. The pressure element 6 can extend over the web width and protrudes slightly from the contact surface 10. The pressure pulse is transmitted through the jacket or the band to the paper web 5, which is pressed at this point with a pressure greater than 10 MPa against the counter-pressure element 3. As a result, the web is compressed on its surface and smoothed.

Als zusätzliches und separates Druckelement 6 ist in dem Ausführungsbeispiel ein in einem Lagerungsraum 8 angeordneter Rotationskörper vorgesehen. Der Lagerungsraum 8 entspricht einem längsgeschnittenen Zylinderhohlraum, dessen Innendurchmesser nur wenig größer ist als der Außendurchmesser des Rotationskörpers. Durch die Unterstützung des über eine Schmiermittelzuleitung 7 unter Druck zugeführten Schmiermittels kann sich der Rotationskörper frei in dem Lagerungsraum 8 drehen.As an additional and separate pressure element 6 a arranged in a storage space 8 rotary body is provided in the embodiment. The storage space 8 corresponds to a longitudinally-cut cylinder cavity, the inner diameter of which is only slightly larger than the outer diameter of the rotational body. By supporting the supplied via a lubricant supply line 7 under pressure lubricant, the rotating body can rotate freely in the storage space 8.

Von den dargestellten Ausführungsformen kann in vielfacher Hinsicht abgewichen werden, ohne den Grundgedanken der Erfindung zu verlassen. Insbesondere ist es völlig freigestellt, welche Form das Druckelement 6 aufweist. Erfindungswesentlich ist nur, dass wenigstens ein Teil des Druckelementes über die Anlagefläche 10 des Schuhs 2 übersteht, um den Druckimpuls auf das Band oder den Mantel 4 ausüben zu können. Dazu genügt ein Überstand in der Größenordnung von 0,001 bis 1 mm.From the illustrated embodiments may be departed from in many ways, without departing from the spirit of the invention. In particular, it is completely optional which shape the pressure element 6 has. It is only essential to the invention that at least part of the pressure element projects beyond the contact surface 10 of the shoe 2 in order to be able to exert the pressure impulse on the belt or the jacket 4. For this purpose, a supernatant in the order of 0.001 to 1 mm is sufficient.

Der Satinageprozess kann, wie allgemein bekannt und deshalb nicht dargestellt, durch Befeuchtungseinrichtungen (Dampf-, Düsenfeuchter) vor der erfindungsgemäßen Vorrichtung 1 unterstützt werden.As is well known and therefore not shown, the calendering process can be assisted by moistening devices (steam, nozzle moistener) in front of the device 1 according to the invention.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Vorrichtung zur Behandlung einer FaserstoffbahnDevice for treating a fibrous web
22
Schuhshoe
33
GegendruckelementCounterpressure element
44
Mantel oder BandCoat or band
55
Faserstoffbahn (kurz Bahn)Fibrous web (short web)
66
Druckelement (Rotationskörper)Pressure element (rotation body)
77
SchmiermittelzufuhrleitungLubricant supply line
88th
Lagerungsraumstorage space
99
Schmiermittelzufuhrlubricant supply
1010
Anlageflächecontact surface
1111
Heizstreckeheating section
1212
Impulsstreckepulse zone
1313
Kontaktzonecontact zone

Claims (10)

  1. Device for processing a fibrous web (5), in which the latter can be pressed against a heatable mating pressure element (3) by a circulating shell or a circulating belt (4), it being possible for the contact pressure to be applied by a shoe (2) which acts from the inside against the shell or the belt (4) with a contact surface (10), by which means the shell or the belt (4), together with the mating roll (3), form a contact zone (13) for the fibrous web (5), which contact zone (13) has a length of at least 100 mm in the running direction of the fibrous web (5), and over the length of which the contact pressure varies,
    characterized in that
    the length of the contact zone (13) comprises a heating section (11) that is longer at the start, reaches over at least half and has a low pressure, and at least one following, very short impulse section (12) at high pressure.
  2. Device according to Claim 1,
    characterized in that
    the low pressure of the heating section (11) lies below 2 MPa.
  3. Device according to either of Claims 1 and 2,
    characterized in that
    the impulse section (12) is determined by an additional pressure element (6), which is connected to the shoe (2).
  4. Device according to Claim 3,
    characterized in that
    the additional pressure element (6) is arranged at the end of the shoe (2) in the running direction of the fibrous web (5).
  5. Device according to Claim 3,
    characterized in that
    the additional pressure element (6) is mounted in the contact surface (10) of the shoe (2).
  6. Device according to Claim 4 or 5,
    characterized in that
    the additional pressure element (6) is a rotating body.
  7. Device according to Claim 6,
    characterized in that
    the rotating body is mounted in a bearing chamber (8) on a lubricating film and can rotate freely.
  8. Device according to one of Claims 3 to 7,
    characterized in that
    the additional pressure element (6) extends over the width of the fibrous web (5).
  9. Device according to one of Claims 3 to 8,
    characterized in that
    the additional pressure element (6) or at least a part thereof projects 0.001 to 1 mm beyond the contact surface (10) in the direction of the belt or shell (4).
  10. Device according to one of Claims 1 to 9,
    characterized in that
    the high pressure of the impulse section (12) is higher than 10 MPa.
EP20100169353 2009-09-15 2010-07-13 Method for processing a sheet of fibrous material Not-in-force EP2314763B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910029482 DE102009029482A1 (en) 2009-09-15 2009-09-15 Device for treating a fibrous web

Publications (2)

Publication Number Publication Date
EP2314763A1 EP2314763A1 (en) 2011-04-27
EP2314763B1 true EP2314763B1 (en) 2012-06-27

Family

ID=43603128

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100169353 Not-in-force EP2314763B1 (en) 2009-09-15 2010-07-13 Method for processing a sheet of fibrous material

Country Status (2)

Country Link
EP (1) EP2314763B1 (en)
DE (1) DE102009029482A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202016106942U1 (en) 2016-02-11 2017-01-02 Voith Patent Gmbh Device for treating a fibrous web

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI71369C (en) * 1983-03-23 1986-12-19 Valmet Oy LAONGNYPPRESS FOER PAPER MASK
DE4410190A1 (en) 1994-03-24 1995-09-28 Blohm Voss Ag Gratings for cooled storage compartments in ships
DE19544979B4 (en) * 1995-12-01 2006-08-03 Voith Paper Patent Gmbh Device for compressing, smoothing and / or dewatering a fibrous web
DE102006001021A1 (en) * 2006-01-07 2007-07-12 Voith Patent Gmbh Paper mill matt-satin finisher for paper or cardboard has extended heating smoothing gap

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202016106942U1 (en) 2016-02-11 2017-01-02 Voith Patent Gmbh Device for treating a fibrous web

Also Published As

Publication number Publication date
EP2314763A1 (en) 2011-04-27
DE102009029482A1 (en) 2011-03-24

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