EP2123825B1 - Method for opening an extended nip - Google Patents

Method for opening an extended nip Download PDF

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Publication number
EP2123825B1
EP2123825B1 EP09004426A EP09004426A EP2123825B1 EP 2123825 B1 EP2123825 B1 EP 2123825B1 EP 09004426 A EP09004426 A EP 09004426A EP 09004426 A EP09004426 A EP 09004426A EP 2123825 B1 EP2123825 B1 EP 2123825B1
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EP
European Patent Office
Prior art keywords
lubricant
roll shell
roll
extended nip
shoe
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Expired - Fee Related
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EP09004426A
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German (de)
French (fr)
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EP2123825A1 (en
Inventor
Robert Meitner
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Andritz Kuesters GmbH
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Andritz Kuesters GmbH
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Publication of EP2123825A1 publication Critical patent/EP2123825A1/en
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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
    • D21F3/0218—Shoe presses
    • 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 opening an extended nip.
  • a press device which comprises a fixed support member, which rotates about an annular member as a roll shell.
  • a hydraulically actuated support member is arranged, which operates on the principle of a hydrodynamic or hydrostatic sliding shoe.
  • a certain amount of lubricant is introduced, which is applied to the inner surface due to the centrifugal force when circulating the roll shell. This amount of lubricant is taken from the annular roll shell during circulation and enters the gap between the inner surface of the roll shell and the running surface of the hydraulically actuated support element during contact with the inner surface.
  • a shoe roll for forming an extended nip with a counter roll for treating a material web.
  • a flexible roll shell is rotatable, which is closable on the edge and is supported in the extended nip on a lubricated running surface of a pressure shoe arranged on the carrier.
  • a means for applying lubricant to the inside of the roll shell is provided for the lubrication of the tread.
  • the applied to the inside of the roll shell oil is taken from the roll shell during circulation and enters the extended nip on the tread of the pressure shoe.
  • the lubricant applied to the inside of the roll mantle can be stripped off again behind the extended nip.
  • suction lines By applying lubricant, an excess amount of oil within the roll shell can accumulate under gravity in a sump.
  • a suction line By means of a suction line, a sump is also pumped out here.
  • a disadvantage of such suction lines is that they should be arranged as possible at the lowest point of the roll mantle. However, this presents difficulties when the roll mantle, due to its flexibility, has deformations in which a sump is immersed. This leads to a troubled run of the roll shell. This is especially true when opening the Langnips at high rotational speeds of the flexible roll shell.
  • the object of the invention is therefore to provide a method for opening an extended nip between a counter element and a shoe roll with a flexible roll shell, which allows smooth running of the roll shell at high speeds.
  • a method for opening an extended nip in which an oil sump is broken down in front of the pressure shoe before the Langnip is opened.
  • the degradation of the oil sump during a period prior to opening the long nip ensures lubrication of the tread until it opens, but by reducing or adjusting the application of lubricant, the oil sump is consumed. A suction or drainage of the oil sump is not required.
  • the reverse approach is used to change the application of lubricant to the inside of the roll shell before the extended nip is opened by means of an inflow regulation.
  • a means for applying lubricant is turned off 0.5 to 4 seconds earlier than the elongated nip is opened.
  • the lubricant especially oil, is then consumed before the long nip is opened becomes.
  • the speed of rotation of the roll shell does not have to be reduced.
  • a possibly provided additional lubrication on the press shoe itself can provide a minimum lubrication, so that a dry running of the tread of the pressure shoe is excluded.
  • the means for applying lubricant may be switched on 0.5 to 4 seconds before and wet the inside of the roll shell and the tread of the press shoe sufficiently with lubricant before the Langnip is closed.
  • the inflow regulation is controlled before the opening of the long nip as a function of the rotational speed of the roll mantle.
  • the time period can then be set short to improve a quick opening of the long nip.
  • the inflow control reduces the feed rate as a function of speed to preferably less than 30% of the feed rate in the operating state of the device.
  • Fig. 1 schematically shows an apparatus for forming at least one extended nip N between a shoe roll 1 and a counter-element 2 for treating a Material web M, in particular a paper, board or tissue web, in a machine for producing and / or finishing the material web.
  • the counter element 2 is preferably a counter-roller or a cylinder.
  • the material web M with or without belt 21 or belts, such as felts or screens, is transported through the long nip N.
  • the shoe roll 1 has a fixed support 3, around which a rotatable flexible roll shell 4 is arranged.
  • the roll shell 4 is formed tubular and with its ends to rotatably seated on the support 3 edge discs (not shown) attached to form a closed shoe roll 1.
  • At least one hydraulically actuated pressure shoe 5 is arranged on the carrier 3.
  • the pressure shoe 5 has a tread 6.
  • the roll shell 4 is in Langnip N on the tread 6, with the same lubrication, supported.
  • the pressure shoe 5 can be pressed against the counter element 2 via a hydraulic element 7, which is fastened to the carrier 3 as a cylinder / piston unit.
  • a number of hydraulic elements 7 is arranged distributed over the length of the pressure shoe 5.
  • the respective hydraulic element 7 presses the pressure shoe 5 via a cylinder / piston unit which has at least one, preferably two cylinder / piston element (s) 10 arranged next to one another.
  • a pressure oil through inlet / outlet lines 9 can be introduced via a pressure chamber 8 in order to press the pressure shoe 5 against the counter element 2.
  • a second pressure chamber 22 is provided, which can be acted upon via supply lines 11.
  • the hydraulic element 7 can store the pressure shoe 5 on a sealing gap, as is known from DE 10 2006 021 428 A1 ,
  • the pressure shoe 5 may further be provided with at least one additional lubrication 13, which supplies the running surface 6 of the pressure shoe 5 with a minimum amount of lubricant for a preferably hydrostatic lubrication.
  • a device 15 for applying lubricant to the inner side 14 of the roll mantle 4 is provided.
  • This device 15 is for example a spray tube for oil as a lubricant.
  • the applied by the device 15 on the inside 14 of the roll shell 4 lubricant is taken from the roll shell 4 during circulation and passes into the extended nip N on the tread 6 of the pressure shoe 5. Since an excess amount of lubricant is applied to the inner surface 14 of the roll shell 4 In order to ensure the function of lubricating the operation of the shoe roll, during circulation, a certain amount of lubricant accumulates in the direction of circulation before the pressure shoe 5 as a sump 16. This under centrifugal in the sump accumulating amount of lubricant can partially drip into a collecting area 17, of where a derivative takes place.
  • the sump formation is additionally effected by gravity.
  • this sump 16 slips quasi as a unit between the pressure shoe 5 and roll shell 4 through, instead of being distributed.
  • the slippage of the sump 16 is made possible by the fact that the Nip réelle in the extended nip N is missing due to the opening, whereby a gap between the roll shell 4 and pressure shoe 5 is formed.
  • the roll shell 4 no longer follows the running surface 6 of the pressure shoe 5. This is generally independent of whether the pressure shoe 5 has a concave, convex or substantially planar shaped running surface 6. Also in the case of the use of a belt 21 or bands was inventively found that the outer band pressure is not sufficient to prevent slippage of the sump 16.
  • the following is provided according to the invention for opening the long nip N at preferably higher speeds.
  • the extended nip N is provided between a counter element 2 and a shoe roll 1 for treating a material web M, in particular a paper, board or tissue web, in a machine for producing and / or finishing the same, wherein the shoe roll 1 has a flexible roll shell 4, the edge side closable and is supported in the extended nip N on a lubricated running surface 6 of a pressure shoe 5 of the shoe roll 1, while the pressure shoe 5 is pressed to the counter element 2, for which purpose lubricant is applied to the inside 14 of the roll shell 4.
  • the period of time during which the lubricant application can be varied, for example, to zero, depending on the rotational speed of the roll shell 4, preferably 0.5 to 4 s.
  • the inflow control is controlled prior to the opening of the long nip N as a function of the rotational speed of the roll mantle.
  • the time period can then be set as short as possible.
  • the inflow control reduces the feed rate as a function of speed to preferably less than 30% of the feed rate in the operating state of the device.
  • the inflow regulation can be time-dependent, in which the period of time is determined.
  • Changing the application of lubricant to the inner side 14 of the rotating roll shell 4 is preferably carried out by means of a controller 19, to which the means 15 for applying lubricant is connected, as in Fig. 3 shown.
  • the material web M is preferably dewatered or smoothed in Langnip N.
  • the long nip N is preferably formed in a wet press or a calender.
  • the extended nip N is preferably opened at speeds of the roll shell 4 greater than 800 m / min.
  • the shoe roll 1 may have its own drive or be towed over a belt 21.
  • a position determination of the counter element 2 is made in order to control the application of lubricant to the inside 14 of the roll shell 4 before opening the extended nip.
  • To the control device 19 then preferably in addition to the means 15 for applying lubricant and a position indicator 20 is connected.

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Abstract

The method involves applying a lubricant on an inner side (14) of a roll shell (4) in such a manner that the certain amount of the lubricant is accumulated as a circulating sump (16) before a pressure shoe (5) in a running direction of the shell during spinning of the shell. The application of the lubricant is reduced at a period before opening an extended nip (N) such that more lubricants are used for lubricating a bearing surface (6) of the pressure shoe to remove the sump before opening the extended nip.

Description

Die Erfindung betrifft ein Verfahren zum Öffnen eines Langspalts.The invention relates to a method for opening an extended nip.

Aus DE 44 02 754 A1 ist eine Presseinrichtung bekannt, die ein feststehendes Trägerelement umfasst, um das ein ringförmiges Element als Walzenmantel umläuft. An dem Trägerelement ist ein hydraulisch betätigbares Stützelement angeordnet, das nach dem Prinzip eines hydrodynamischen oder hydrostatischen Gleitschuhs arbeitet. In das Innere des Walzenmantels wird eine bestimmte Menge Schmiermittel eingebracht, die auf die Innenfläche aufgrund der Fliehkraftwirkung beim Umlaufen des Walzenmantels aufgetragen wird. Diese Menge Schmiermittel wird vom ringförmigen Walzenmantel beim Umlaufen mitgenommen und gelangt in den Spalt zwischen Innenfläche des Walzenmantels und Lauffläche des hydraulisch betätigbaren Stützelementes während der Anpressung an die Innenfläche.Out DE 44 02 754 A1 a press device is known, which comprises a fixed support member, which rotates about an annular member as a roll shell. On the support member, a hydraulically actuated support member is arranged, which operates on the principle of a hydrodynamic or hydrostatic sliding shoe. Into the interior of the roll shell, a certain amount of lubricant is introduced, which is applied to the inner surface due to the centrifugal force when circulating the roll shell. This amount of lubricant is taken from the annular roll shell during circulation and enters the gap between the inner surface of the roll shell and the running surface of the hydraulically actuated support element during contact with the inner surface.

Da eine überschüssige Ölmenge auf die Innenfläche des Walzenmantels aufgebracht wird, staut sich beim Umlauf eine gewisse Ölmenge in Umlaufrichtung vor dem Druckschuh, d.h. vor dem Einlaufspalt zwischen Innenfläche des Walzenmantels und der Lauffläche des Stützelementes. Dieser Schmiermittelstau wird im Allgemeinen durch stehende Siphonsysteme abgebaut. Daraus ergeben sich einige Probleme bei der Anordnung bzw. Aufhängung von Siphonsystemen.As an excess amount of oil applied to the inner surface of the roll shell is, accumulates when circulating a certain amount of oil in the direction of rotation in front of the pressure shoe, ie before the inlet gap between the inner surface of the roll shell and the running surface of the support element. This lubricant accumulation is generally degraded by standing siphon systems. This results in some problems with the arrangement or suspension of siphon systems.

Aus DE 20 2005 019 693 U1 ist eine Schuhwalze zur Bildung eines Langspalts mit einer Gegenwalze zur Behandlung einer Materialbahn bekannt. Um einen Träger ist ein flexibler Walzenmantel drehbar, der randseitig verschließbar ist und im Langspalt auf einer geschmierten Lauffläche eines am Träger angeordneten Druckschuhs abgestützt ist. Für die Schmierung der Lauffläche ist eine Einrichtung zum Auftragen von Schmiermittel auf die Innenseite des Walzenmantels vorgesehen. Das auf die Innenseite des Walzenmantels aufgetragene Öl wird von dem Walzenmantel beim Umlaufen mitgenommen und gelangt in den Langspalt auf die Lauffläche des Druckschuhs. Mittels eines Schabers ist das auf der Innenseite des Walzenmantels aufgebrachte Schmiermittel hinter dem Langspalt wieder abrakelbar.Out DE 20 2005 019 693 U1 For example, a shoe roll is known for forming an extended nip with a counter roll for treating a material web. Around a carrier, a flexible roll shell is rotatable, which is closable on the edge and is supported in the extended nip on a lubricated running surface of a pressure shoe arranged on the carrier. For the lubrication of the tread a means for applying lubricant to the inside of the roll shell is provided. The applied to the inside of the roll shell oil is taken from the roll shell during circulation and enters the extended nip on the tread of the pressure shoe. By means of a scraper, the lubricant applied to the inside of the roll mantle can be stripped off again behind the extended nip.

Durch das Auftragen von Schmiermittel kann sich eine überschüssige Ölmenge innerhalb des Walzenmantels unter Schwerkraftwirkung in einem Sumpf ansammeln. Mittels einer Saugleitung wird auch hier ein Sumpf abgepumpt. Nachteilig bei solchen Saugleitungen ist, dass sie möglichst an der tiefsten Stelle des Walzenmantels angeordnet sein sollten. Dies bereitet jedoch Schwierigkeiten, wenn der Walzenmantel aufgrund seiner Flexibilität Verformungen besitzt, in die ein Sumpf eintaucht. Dies führt zu einem unruhigen Lauf des Walzenmantels. Dies gilt insbesondere beim Öffnen des Langnips bei hohen Umlaufgeschwindigkeiten des flexiblen Walzenmantels.By applying lubricant, an excess amount of oil within the roll shell can accumulate under gravity in a sump. By means of a suction line, a sump is also pumped out here. A disadvantage of such suction lines is that they should be arranged as possible at the lowest point of the roll mantle. However, this presents difficulties when the roll mantle, due to its flexibility, has deformations in which a sump is immersed. This leads to a troubled run of the roll shell. This is especially true when opening the Langnips at high rotational speeds of the flexible roll shell.

Aufgabe der Erfindung ist es daher, ein Verfahren zum Öffnen eines Langspalts zwischen einem Gegenelement und einer Schuhwalze mit einem flexiblen Walzenmantel zu schaffen, das einen ruhigen Lauf des Walzenmantels bei hohen Geschwindigkeiten ermöglicht.The object of the invention is therefore to provide a method for opening an extended nip between a counter element and a shoe roll with a flexible roll shell, which allows smooth running of the roll shell at high speeds.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.This object is solved by the features of claim 1.

Hierdurch wird ein Verfahren zum Öffnen eines Langspalts geschaffen, bei dem ein Ölsumpf vor dem Druckschuh abgebaut wird, bevor der Langnip geöffnet wird. Überraschenderweise wurde festgestellt, dass der Abbau des Ölsumpfes während eines Zeitabschnitts vor dem Öffnen des Langnips die Schmierung der Lauffläche bis zum Öffnen sicherstellt, wobei aber durch Verringerung oder Einstellen des Auftragens von Schmiermittel der Ölsumpf verbraucht wird. Ein Absaugen oder Ableiten des Ölsumpfes ist nicht erforderlich. Erfindungsgemäß wird vielmehr der umgekehrte Weg beschritten, durch eine Zuflussregulierung das Auftragen von Schmiermittel auf die Innenseite des Walzenmantels vor dem Öffnen des Langspalts zu verändern.As a result, a method for opening an extended nip is provided in which an oil sump is broken down in front of the pressure shoe before the Langnip is opened. Surprisingly, it has been found that the degradation of the oil sump during a period prior to opening the long nip ensures lubrication of the tread until it opens, but by reducing or adjusting the application of lubricant, the oil sump is consumed. A suction or drainage of the oil sump is not required. Instead, according to the invention, the reverse approach is used to change the application of lubricant to the inside of the roll shell before the extended nip is opened by means of an inflow regulation.

Erfindungsgemäß wurde erkannt, dass ursächlich für den unruhigen Lauf des Walzenmantels beim Öffnen des Langnips ist, dass der im Betrieb einer Schuhwalze sich vor dem Druckschuh bildende Sumpf quasi als Einheit zwischen Schuh und Walzenmantel hindurchrutscht, anstatt sich gleichmäßig zu verteilen. Das führt zu einer starken Unwucht und so zu einem unruhigen Lauf des Walzenmantels. Die Schuhwalze musste deshalb bisher auf niedrigere Geschwindigkeiten heruntergefahren werden, damit sie sich wieder beruhigt. Ohne eine Überschussmenge an Schmiermittel und der zwangsläufig sich ergebenden Sumpfbildung vor dem Einlauf in den Langnip läuft der Schuh jedoch trocken, wodurch der Walzenmantel ebenfalls unruhig wird. Die Sumpfbildung ist für die Betriebszustände der Schuhwalze folglich erforderlich. Durch das erfindungsgemäße Verfahren stellen solche Sümpfe auch keine Probleme mehr dar, und zwar dann, wenn der Langspalt nach einem Zeitabschnitt mit geregelter Ölzufuhr geöffnet wird. Apparativ aufwendige Ölabfuhrsysteme werden vermieden.According to the invention, it has been recognized that the cause of the troubled run of the roll shell when opening the long nip is that the sump forming in front of the pressure shoe during operation of a shoe roll virtually slips as a unit between the shoe and roll shell instead of being distributed evenly. This leads to a strong imbalance and so to a troubled run of the roll mantle. The shoe roll had therefore previously been shut down to lower speeds, so it calms down again. However, without an excess amount of lubricant and the inevitably resulting swamp formation prior to entry into the elongated nip, the shoe runs dry, which also makes the roll mantle restless. The sumping is therefore required for the operating conditions of the shoe roll. By means of the method according to the invention, such sumps also do not pose any problems, namely when the extended nip is opened after a period of time with controlled oil supply. Apparatively complex oil removal systems are avoided.

Vorzugsweise wird vor Öffnen des Langnips eine Einrichtung zum Auftragen von Schmiermittel 0,5 bis 4 s früher abgeschaltet, als der Langnip geöffnet wird. Das Schmiermittel, insbesondere Öl, wird dann verbraucht, bevor der Langnip geöffnet wird. Die Umlaufgeschwindigkeit des Walzenmantels muss nicht reduziert werden. Eine gegebenenfalls vorgesehene Zusatzschmierung am Pressschuh selbst kann für eine Mindestschmierung sorgen, so dass ein Trockenlaufen der Lauffläche des Druckschuhs ausgeschlossen ist. Zum Schließen des Langnips kann die Einrichtung zum Auftragen von Schmiermittel 0,5 bis 4 s vorher eingeschaltet werden und die Innenseite des Walzenmantels und die Lauffläche des Pressschuhs ausreichend mit Schmiermittel benetzen, bevor der Langnip geschlossen wird.Preferably, prior to opening the long nip, a means for applying lubricant is turned off 0.5 to 4 seconds earlier than the elongated nip is opened. The lubricant, especially oil, is then consumed before the long nip is opened becomes. The speed of rotation of the roll shell does not have to be reduced. A possibly provided additional lubrication on the press shoe itself can provide a minimum lubrication, so that a dry running of the tread of the pressure shoe is excluded. To close the long nip, the means for applying lubricant may be switched on 0.5 to 4 seconds before and wet the inside of the roll shell and the tread of the press shoe sufficiently with lubricant before the Langnip is closed.

Vorzugsweise wird die Zuflussregulierung vor dem Öffnen des Langnips in Abhängigkeit von der Umlaufgeschwindigkeit des Walzenmantels gesteuert. Der Zeitabschnitt kann dann kurz eingestellt werden, um ein schnelles Öffnen des Langnips zu verbessern. Die Zuflussregulierung reduziert die Zufuhrmenge geschwindigkeitsabhängig auf vorzugsweise weniger als 30% der Zufuhrmenge im Betriebszustand der Vorrichtung.Preferably, the inflow regulation is controlled before the opening of the long nip as a function of the rotational speed of the roll mantle. The time period can then be set short to improve a quick opening of the long nip. The inflow control reduces the feed rate as a function of speed to preferably less than 30% of the feed rate in the operating state of the device.

Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further embodiments of the invention are described in the following description and the dependent claims.

Die Erfindung wird nachstehend anhand der in den beigefügten Abbildungen dargestellten Ausführungsbeispiele näher erläutert.

  • Fig. 1 zeigt schematisch einen Querschnitt einer Vorrichtung zum Bilden eines Langspalts mit geschlossenem Langnip,
  • Fig. 2 zeigt schematisch einen Querschnitt der Vorrichtung gemäß Fig. 1 mit geöffnetem Langnip,
  • Fig. 3 zeigt schematisch einen Querschnitt einer Vorrichtung zum Bilden eines Langspalts mit geöffnetem Langnip, der gemäß dem erfindungsgemäßen Verfahren geöffnet wurde.
The invention will be explained in more detail with reference to the embodiments illustrated in the accompanying drawings.
  • Fig. 1 shows schematically a cross-section of an apparatus for forming a long nip with closed Langnip,
  • Fig. 2 schematically shows a cross section of the device according to Fig. 1 with open Langnip,
  • Fig. 3 schematically shows a cross-section of an apparatus for forming an extended nip open long gap, which has been opened according to the inventive method.

Fig. 1 zeigt schematisch eine Vorrichtung zum Bilden mindestens eines Langspalts N zwischen einer Schuhwalze 1 und einem Gegenelement 2 zum Behandeln einer Materialbahn M, insbesondere einer Papier-, Karton- oder Tissuebahn, in einer Maschine zur Herstellung und/oder Veredelung der Materialbahn. Das Gegenelement 2 ist vorzugsweise eine Gegenwalze oder ein Zylinder. Je nach Behandlungsart wird die Materialbahn M mit oder ohne Band 21 oder Bänder, wie Filze oder Siebe, durch den Langnip N transportiert. Fig. 1 schematically shows an apparatus for forming at least one extended nip N between a shoe roll 1 and a counter-element 2 for treating a Material web M, in particular a paper, board or tissue web, in a machine for producing and / or finishing the material web. The counter element 2 is preferably a counter-roller or a cylinder. Depending on the type of treatment, the material web M with or without belt 21 or belts, such as felts or screens, is transported through the long nip N.

Die Schuhwalze 1 weist einen feststehenden Träger 3 auf, um den ein drehbarer flexibler Walzenmantel 4 angeordnet ist. Der Walzenmantel 4 ist schlauchförmig ausgebildet und mit seinen Enden an drehbar auf dem Träger 3 sitzenden Randscheiben (nicht dargestellt) befestigt, um eine geschlossene Schuhwalze 1 zu bilden.The shoe roll 1 has a fixed support 3, around which a rotatable flexible roll shell 4 is arranged. The roll shell 4 is formed tubular and with its ends to rotatably seated on the support 3 edge discs (not shown) attached to form a closed shoe roll 1.

Mindestens ein hydraulisch betätigbarer Druckschuh 5 ist am Träger 3 angeordnet. Der Druckschuh 5 besitzt eine Lauffläche 6. Der Walzenmantel 4 ist im Langnip N auf der Lauffläche 6, und zwar unter Schmierung derselben, abgestützt. Der Druckschuh 5 ist über ein Hydraulikelement 7, das als Zylinder-/Kolbeneinheit an dem Träger 3 befestigt ist, gegen das Gegenelement 2 pressbar. Eine Anzahl Hydraulikelemente 7 ist über die Länge des Druckschuhs 5 verteilt angeordnet.At least one hydraulically actuated pressure shoe 5 is arranged on the carrier 3. The pressure shoe 5 has a tread 6. The roll shell 4 is in Langnip N on the tread 6, with the same lubrication, supported. The pressure shoe 5 can be pressed against the counter element 2 via a hydraulic element 7, which is fastened to the carrier 3 as a cylinder / piston unit. A number of hydraulic elements 7 is arranged distributed over the length of the pressure shoe 5.

Das jeweilige Hydraulikelement 7 presst den Druckschuh 5 über eine Zylinder-/ Kolbeneinheit, die mindestens ein, vorzugsweise zwei nebeneinander angeordnete Zylinder-/Kolbenelement(e) 10 aufweist. In jedes Zylinder-/Kolbenelement 10 ist über eine Druckkammer 8 ein Drucköl durch Zu-/Ableitungen 9 einleitbar, um den Druckschuh 5 gegen das Gegenelement 2 zu pressen. Zur schwimmenden Lagerung des Druckschuhs 5 auf dem jeweiligen Hydraulikelement 7 ist eine zweite Druckkammer 22 vorgesehen, die über Zu-/Ableitungen 11 beaufschlagbar ist. Über eine Drosselbohrung 12 kann das Hydraulikelement 7 den Druckschuh 5 auf einem Dichtspalt lagern, wie dies bekannt ist aus DE 10 2006 021 428 A1 .The respective hydraulic element 7 presses the pressure shoe 5 via a cylinder / piston unit which has at least one, preferably two cylinder / piston element (s) 10 arranged next to one another. In each cylinder / piston element 10, a pressure oil through inlet / outlet lines 9 can be introduced via a pressure chamber 8 in order to press the pressure shoe 5 against the counter element 2. For floating mounting of the pressure shoe 5 on the respective hydraulic element 7, a second pressure chamber 22 is provided, which can be acted upon via supply lines 11. Via a throttle bore 12, the hydraulic element 7 can store the pressure shoe 5 on a sealing gap, as is known from DE 10 2006 021 428 A1 ,

Der Druckschuh 5 kann ferner mit mindestens einer Zusatzschmierung 13 versehen sein, die die Lauffläche 6 des Druckschuhs 5 mit einer Mindestmenge an Schmiermittel für eine vorzugsweise hydrostatische Schmierung versorgt.The pressure shoe 5 may further be provided with at least one additional lubrication 13, which supplies the running surface 6 of the pressure shoe 5 with a minimum amount of lubricant for a preferably hydrostatic lubrication.

Zur zusätzlichen hydrodynamischen Schmierung zwischen der Lauffläche 6 des Druckschuhs 5 und der Innenseite 14 des Walzenmantels 4 ist eine Einrichtung 15 zum Auftragen von Schmiermittel auf die Innenseite 14 des Walzenmantels 4 vorgesehen. Diese Einrichtung 15 ist beispielsweise ein Spritzrohr für Öl als Schmiermittel.For additional hydrodynamic lubrication between the running surface 6 of the pressure shoe 5 and the inner side 14 of the roll mantle 4, a device 15 for applying lubricant to the inner side 14 of the roll mantle 4 is provided. This device 15 is for example a spray tube for oil as a lubricant.

Das von der Einrichtung 15 auf die Innenseite 14 des Walzenmantels 4 aufgetragene Schmiermittel wird vom Walzenmantel 4 beim Umlaufen mitgenommen und gelangt in den Langspalt N auf die Lauffläche 6 des Druckschuhs 5. Da eine überschüssige Menge an Schmiermittel auf die Innenfläche 14 des Walzenmantels 4 aufgebracht wird, um die Funktion des Schmierens beim Betrieb der Schuhwalze sicherzustellen, staut sich beim Umlauf eine gewisse Menge an Schmiermittel in Umlaufrichtung vor dem Druckschuh 5 als Sumpf 16. Diese unter Fliehkraft im Sumpf sich ansammelnde Menge an Schmiermittel kann teilweise in einen Auffangbereich 17 tropfen, von wo eine Ableitung erfolgt. Bei einer Anordnung des Druckschuhs 5 nicht oben in der Schuhwalze, wie in Fig. 1 dargestellt, sondern alternativ oder gegebenenfalls zusätzlich unten in der Schuhwalze 1 wird die Sumpfbildung zusätzlich durch Schwerkraft bewirkt.The applied by the device 15 on the inside 14 of the roll shell 4 lubricant is taken from the roll shell 4 during circulation and passes into the extended nip N on the tread 6 of the pressure shoe 5. Since an excess amount of lubricant is applied to the inner surface 14 of the roll shell 4 In order to ensure the function of lubricating the operation of the shoe roll, during circulation, a certain amount of lubricant accumulates in the direction of circulation before the pressure shoe 5 as a sump 16. This under centrifugal in the sump accumulating amount of lubricant can partially drip into a collecting area 17, of where a derivative takes place. In an arrangement of the pressure shoe 5 not at the top of the shoe roll, as in Fig. 1 shown, but alternatively or optionally additionally below in the shoe roll 1, the sump formation is additionally effected by gravity.

Wird nun bei hohen Geschwindigkeiten der Langnip N geöffnet, wie in Fig. 2 dargestellt, rutscht dieser Sumpf 16 quasi als Einheit zwischen Druckschuh 5 und Walzenmantel 4 hindurch, anstatt sich zu verteilen. Das Durchrutschen des Sumpfes 16 wird dadurch ermöglicht, dass durch das Öffnen der Nipdruck im Langspalt N fehlt, wodurch eine Lücke zwischen Walzenmantel 4 und Druckschuh 5 entsteht. Der Walzenmantel 4 folgt nicht mehr der Lauffläche 6 des Druckschuhs 5. Dies gilt im Allgemeinen unabhängig davon, ob der Druckschuh 5 eine konkav, konvex oder eine im Wesentlichen eben geformte Lauffläche 6 aufweist. Auch im Falle des Einsatzes von einem Band 21 oder Bänder wurde erfindungsgemäß festgestellt, dass der äußere Banddruck nicht ausreicht, ein Durchrutschen des Sumpfes 16 zu verhindern.Now open at high speeds of Langnip N, as in Fig. 2 shown, this sump 16 slips quasi as a unit between the pressure shoe 5 and roll shell 4 through, instead of being distributed. The slippage of the sump 16 is made possible by the fact that the Nipdruck in the extended nip N is missing due to the opening, whereby a gap between the roll shell 4 and pressure shoe 5 is formed. The roll shell 4 no longer follows the running surface 6 of the pressure shoe 5. This is generally independent of whether the pressure shoe 5 has a concave, convex or substantially planar shaped running surface 6. Also in the case of the use of a belt 21 or bands was inventively found that the outer band pressure is not sufficient to prevent slippage of the sump 16.

Der folglich mit dem Walzenmantel 4 in einer Ausbeulung des flexiblen Walzenmantels 4 mit umlaufende Sumpf 16 führt zu einer starken Unwucht 18 und so zu einem sehr unruhigen Lauf des Walzenmantels 4. Dies ist in Fig. 2 anhand der Pfeile im Bereich des Sumpfes 16 und der Unwucht 18 dargestellt. Fig. 2 zeigt die Vorrichtung ohne Materialbahn M und Band 21.The consequently with the roll shell 4 in a bulge of the flexible roll shell 4 with circumferential sump 16 leads to a strong imbalance 18 and so to a very troubled run of the roll shell 4. This is in Fig. 2 illustrated by the arrows in the area of the sump 16 and the imbalance 18. Fig. 2 shows the device without web M and band 21st

Zur Vermeidung der Ausbildung einer störenden Unwucht 18 ist erfindungsgemäß zum Öffnen des Langnips N bei vorzugsweise höheren Geschwindigkeiten folgendes vorgesehen.To avoid the formation of a disturbing imbalance 18, the following is provided according to the invention for opening the long nip N at preferably higher speeds.

Der Langspalt N ist vorgesehen zwischen einem Gegenelement 2 und einer Schuhwalze 1 zum Behandeln einer Materialbahn M, insbesondere einer Papier-, Karton- oder Tissuebahn, in einer Maschine zur Herstellung und/oder Veredelung derselben, wobei die Schuhwalze 1 einen flexiblen Walzenmantel 4 besitzt, der randseitig verschließbar und im Langspalt N auf einer geschmierten Lauffläche 6 eines Druckschuhs 5 der Schuhwalze 1 abgestützt wird, während der Druckschuh 5 zum Gegenelement 2 gedrückt wird, wozu Schmiermittel auf die Innenseite 14 des Walzenmantels 4 aufgetragen wird. Wird das Auftragen von Schmiermittel auf die Innenseite 14 des umlaufenden Walzenmantels 4 vor dem Öffnen des Langspalts N während eines Zeitabschnitts derart verringert, dass mehr Schmiermittel zur Schmierung der Lauffläche 6 des Druckschuhs 5 verbraucht als aufgetragen wird, ist ein ruhiger Lauf des Walzenmantels 4 beim Öffnen des Langnips N möglich.The extended nip N is provided between a counter element 2 and a shoe roll 1 for treating a material web M, in particular a paper, board or tissue web, in a machine for producing and / or finishing the same, wherein the shoe roll 1 has a flexible roll shell 4, the edge side closable and is supported in the extended nip N on a lubricated running surface 6 of a pressure shoe 5 of the shoe roll 1, while the pressure shoe 5 is pressed to the counter element 2, for which purpose lubricant is applied to the inside 14 of the roll shell 4. If the application of lubricant to the inner side 14 of the rotating roll mantle 4 during opening of the extended nip N during a period of time is reduced so that more lubricant is consumed for lubricating the running surface 6 of the pressure shoe 5 than is applied, a smooth running of the roll mantle 4 during opening of the long nip N possible.

Der Zeitabschnitt, während dem der Schmiermittelauftrag beispielsweise bis auf Null verändert werden kann, beträgt abhängig von der Umlaufgeschwindigkeit des Walzenmantels 4 vorzugsweise 0,5 bis 4 s.The period of time during which the lubricant application can be varied, for example, to zero, depending on the rotational speed of the roll shell 4, preferably 0.5 to 4 s.

Vorzugsweise wird die Zuflussregulierung vor dem Öffnen des Langnips N in Abhängigkeit von der Umlaufgeschwindigkeit des Walzenmantels gesteuert. Der Zeitabschnitt kann dann möglichst kurz eingestellt werden. Die Zuflussregulierung reduziert die Zufuhrmenge geschwindigkeitsabhängig auf vorzugsweise weniger als 30% der Zufuhrmenge im Betriebszustand der Vorrichtung. Alternativ oder zusätzlich kann die Zuflussregulierung zeitabhängig erfolgen, in dem der Zeitabschnitt bestimmt gewählt wird.Preferably, the inflow control is controlled prior to the opening of the long nip N as a function of the rotational speed of the roll mantle. The time period can then be set as short as possible. The inflow control reduces the feed rate as a function of speed to preferably less than 30% of the feed rate in the operating state of the device. Alternatively or in addition the inflow regulation can be time-dependent, in which the period of time is determined.

Das Verändern des Auftragens von Schmiermittel auf die Innenseite 14 des umlaufenden Walzenmantels 4 erfolgt vorzugsweise mittels einer Steuerung 19, an die die Einrichtung 15 zum Auftragen von Schmiermittel angeschlossen ist, wie in Fig. 3 dargestellt.Changing the application of lubricant to the inner side 14 of the rotating roll shell 4 is preferably carried out by means of a controller 19, to which the means 15 for applying lubricant is connected, as in Fig. 3 shown.

Die Materialbahn M wird im Langnip N vorzugsweise entwässert oder geglättet. Der Langnip N ist dazu vorzugsweise in einer Nasspresse oder einem Kalander ausgebildet.The material web M is preferably dewatered or smoothed in Langnip N. The long nip N is preferably formed in a wet press or a calender.

Der Langspalt N wird vorzugsweise bei Geschwindigkeiten des Walzenmantels 4 größer 800 m/min geöffnet. Die Schuhwalze 1 kann einen eigenen Antrieb haben oder über ein Band 21 mitgeschleppt werden.The extended nip N is preferably opened at speeds of the roll shell 4 greater than 800 m / min. The shoe roll 1 may have its own drive or be towed over a belt 21.

Ferner kann vorgesehen sein, dass eine Positionsbestimmung des Gegenelementes 2 vorgenommen wird, um das Auftragen von Schmiermittel auf die Innenseite 14 des Walzenmantels 4 vor dem Öffnen des Langspalts zu steuern. An die Steuereinrichtung 19 ist dann vorzugsweise neben der Einrichtung 15 zum Auftragen von Schmiermittel auch ein Positionsmesser 20 angeschlossen.Furthermore, it can be provided that a position determination of the counter element 2 is made in order to control the application of lubricant to the inside 14 of the roll shell 4 before opening the extended nip. To the control device 19 then preferably in addition to the means 15 for applying lubricant and a position indicator 20 is connected.

Claims (9)

  1. Method for opening an extended nip between a mating element and a shoe roll (1) for treating a material web (M), in particular a paper, board or tissue web, in a machine for producing and/or finishing the same, the shoe roll (1) having a flexible roll shell (4) which can be closed at the end and is supported in the extended nip on a lubricated running surface (6) of a pressure shoe (5) belonging to the shoe roll (1) while the pressure shoe (5) is pressed towards the mating element (2), for which purpose lubricant is applied to the inside of the roll shell (4), the lubricant being applied to the inside of the roll shell (4) in such a way that, as the roll shell (4) revolves, a certain amount of lubricant collects in front of the pressure shoe (5) in the direction of revolution of the roll shell (4) as a lubricant sump (16) and, before the extended nip (N) is opened, the application of lubricant to the inside (14) of the revolving roll shell (4) being reduced during a time interval in such a way that more lubricant is used for lubricating the running surface (6) of the pressure shoe (5) than is applied, and thus the lubricant sump (16) is used up before the extended nip (N) is opened.
  2. Method according to Claim 1, characterized in that the application of lubricant to the inside (14) of the revolving roll shell (4) is switched off before the extended nip (N) is opened.
  3. Method according to Claim 1 or 2, characterized in that feed regulation of the application of lubricant is carried out during the time interval as a function of the speed of revolution of the roll shell (4).
  4. Method according to Claim 3, characterized in that the time interval is 0.5 to 4 seconds, irrespective of the speed of revolution of the roll shell (4).
  5. Method according to one of Claims 1 to 4, characterized in that the time interval for feed regulation of the application of lubricant is chosen as a function of the speed of revolution of the roll shell (4).
  6. Method according to one of Claims 1 to 5, characterized in that the material web (M) is dewatered or calendered in the extended nip (N).
  7. Method according to one of Claims 1 to 6, characterized in that the extended nip (N) is opened at speeds of the roll shell (4) greater than 800 m/min.
  8. Method according to one of Claims 1 to 7, characterized in that the position of the mating element (2) is determined in order to control the application of lubricating oil to the inside (14) of the roll shell (4) before the extended nip (N) is opened.
  9. Method according to one of Claims 1 to 8, characterized in that the mating element (2) is formed by a mating roll or a cylinder.
EP09004426A 2008-05-24 2009-03-27 Method for opening an extended nip Expired - Fee Related EP2123825B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008025042A DE102008025042A1 (en) 2008-05-24 2008-05-24 Method for opening an extended nip

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EP2123825A1 EP2123825A1 (en) 2009-11-25
EP2123825B1 true EP2123825B1 (en) 2010-11-10

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EP09004426A Expired - Fee Related EP2123825B1 (en) 2008-05-24 2009-03-27 Method for opening an extended nip

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EP (1) EP2123825B1 (en)
AT (1) ATE487825T1 (en)
DE (2) DE102008025042A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITFI20130106A1 (en) * 2013-05-09 2014-11-10 Toscotec S P A SHOE PRESS.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3602565A1 (en) * 1985-02-01 1986-10-09 J.M. Voith Gmbh, 7920 Heidenheim Roller press having a long-nip press roller
DE4402754A1 (en) 1994-01-31 1994-06-16 Voith Gmbh J M Pressure element - with collector unit in oil siphon system which is mounted at points least influenced by beam deflections
DE19613392C1 (en) * 1996-04-03 1997-07-24 Voith Sulzer Papiermasch Gmbh Fibre web press assembly
DE10259232A1 (en) * 2002-12-17 2004-07-15 Eduard Küsters Maschinenfabrik GmbH & Co. KG Device for forming an elongated gap
DE202005019693U1 (en) 2005-12-12 2006-02-23 Eduard Küsters Maschinenfabrik GmbH & Co. KG Shoe press roller forming a long press gap for a paper web, with a counter roller, has inner mantle surface lubrication for the press shoe surface with a scraper and suction extraction to remove surplus lubricant
DE102006021428A1 (en) 2006-05-05 2007-11-08 Andritz Küsters GmbH & Co. KG Device for forming at least one extended nip

Also Published As

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ATE487825T1 (en) 2010-11-15
DE102008025042A1 (en) 2009-11-26
DE502009000161D1 (en) 2010-12-23
EP2123825A1 (en) 2009-11-25

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