EP1284319B1 - Extended nip press for dewatering a fibrous web - Google Patents

Extended nip press for dewatering a fibrous web Download PDF

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Publication number
EP1284319B1
EP1284319B1 EP02017876A EP02017876A EP1284319B1 EP 1284319 B1 EP1284319 B1 EP 1284319B1 EP 02017876 A EP02017876 A EP 02017876A EP 02017876 A EP02017876 A EP 02017876A EP 1284319 B1 EP1284319 B1 EP 1284319B1
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EP
European Patent Office
Prior art keywords
roll
press
extended nip
shoe
support
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EP02017876A
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German (de)
French (fr)
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EP1284319A1 (en
Inventor
Bernhard Dr. Brendel
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Andritz Kuesters GmbH
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Andritz Kuesters GmbH
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Publication of EP1284319A1 publication Critical patent/EP1284319A1/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

Definitions

  • the invention relates to an extended nip roll press for dewatering a fibrous web according to the preamble of claim 1.
  • Such an extended-nip roller press is known for example from DE 35 03 240 C2, which has a driven counter-roller, which is assigned a fixed support body with a press shoe guided therein.
  • the press shoe is hydraulically pressed against the counter roll.
  • To the support body is passed around an endless roll shell.
  • the press shoe forms with the corresponding roller portion of the backing roll an extended press nip, through which the fiber web to be dewatered, embedded between webs of material is guided together with the roll shell in the web running direction.
  • the press shoe has an upper part which has a slideway along which the roll jacket runs.
  • the slideway is selectable depending on the desired Preßdruckverlaufs on the press nip width and gives the press shoe an effective shoe width.
  • the object of the invention is therefore to provide a long-nip roller press of the type mentioned, the roll shell is subject to less wear.
  • an extended-nip roll press which stabilizes the Walzenmantellauf the extended-nip press roll by direct support of an outer roll shell portion of the backing roll, so that Walzenmantelverform12.
  • the roll shell is guided in the area between the effective shoe width of the press shoe and the Endabitesbefest Nathan by the support ring in an orbit, which leads the Walzenmantelauslenkung edge of the nip on the diameter of the end walls.
  • a substantially kink-free transition of the roll shell from the nip to the respective Endabismebefestist can be ensured.
  • the cost advantage resulting from the use of narrow webs instead of alternatively over the entire width of the backing roll extending webs remains intact.
  • the support ring is formed such that it allows a continuous extension of the roll shell outside the nip.
  • the support of the roll shell edge side of the nip preferably takes place by means of a radial thickness of the support ring, which has at least beßschuh character a height which connects to the in the press nip by the lying on the mating surface material web (s) and the arranged fibrous web conditional height.
  • the roll shell thus undergoes a support which is adapted to the predetermined in the press nip location.
  • the support ring can not only support the roll shell, but also lead simultaneously, by a targeted radial change in thickness of the support ring, whereby the Walzenmantelausschung defined by the press nip for Endabitesbefest Trent is executed. Since the roll shell is preferably inflated using at least a slight overpressure, the roll shell attaches itself to the support ring of the counter roll and follows its guide path in the transition region between effective shoe width and Endabexcellentbefest combat.
  • the mating roll further has, in each case following its mating surface on an annular recess, whereby the web edges of the guided with the fibrous web material web (s) receive a freewheel.
  • the felts preferably used as material web (s) have at their Brurändem often thickenings, which originate from selvedges, edges, etc., and thus are production-related. To avoid prints on the roll shell, the web edges therefore preferably run over a free space. A sufficient axial extension of the free space ensures that remain at an elongation or shortening of the web during operation, the web edges of the webs of material over the free space. In addition, the web overhang simplifies the position control of the material web (s).
  • Fig. 1 shows an extended-nip roll press for dewatering a fibrous web, in particular a paper web, which may be part of a papermaking plant. Shown and explained below is a left half of the extended-nip roll press. The right half is formed mirror-symmetrically to the dividing line T, so that the following statements apply to the left half for the right half accordingly.
  • the extended-nip roll press comprises an extended-nip press roll 1 and a driven counter-roll 2, which cooperate in a press nip 3.
  • a press nip 3 Through the press nip 3, at least one material web is guided together with the fibrous web to be pressed. If only one material web is provided, it is a so-called simply felted press.
  • two webs 4, 5 are provided, between which the fibrous web 6 to be pressed is guided.
  • the material webs 4, 5 are preferably made of felt.
  • the extended-nip press roll 1 comprises a fixed support 7 and a roll shell 8 which can be rotated about the support and consists of a flexible material, eg rubber or plastic.
  • the roll shell 8 is formed tubular and fixed with its end portions on rotatably seated on the support 7 end walls 9 to a closed long-nip press roll. 1 to build.
  • a space 10 between the carrier 7 and roll shell 8 is preferably supplied with compressed air, whereby the roll shell 8 is inflated to obtain a cylindrical shape.
  • a press shoe 11 On the support 7, a press shoe 11 is provided, which is supported on a support strip of a plurality of spaced-apart hydraulic support elements 12 on the carrier 7 and can be pressed in the direction of the counter-roller 2.
  • the press shoe 11 has an effective shoe width 13 (compare Fig. 2 and Fig. 3), which forms a sliding surface on which the roll shell 8 is supported in the region of the press nip 3.
  • the support elements 12 are in a known manner via pressure medium lines 14 to a hydraulic pressure means, e.g. Oil or water, connected.
  • the press shoe 11 forms with the corresponding shell portion of the backing roll 2 the extended press nip 3, through which the two webs 4, 5 and to be dewatered fibrous web 6 are performed together with the roll shell 8 in a web running direction.
  • the counter roll 2 is here designed as a bending compensating roll with a fixed roll core 20 and a roll core 20 rotatable roll shell 19, which is supported on the edge side via pivot bearings 21, 22 and along its lateral surface via a support bar hydraulic support elements 18 on the roll core 20.
  • a roll neck end 15 is mounted in a bearing 16.
  • An unillustrated drive can attack the roll shell 19 in a known manner.
  • the roll shell 19 is also preferably provided with an elastic coating 17.
  • the hydraulic support elements 18 are connected in a known manner to pressure medium lines 23.
  • the counter-roller 2 has one of the effective shoe width 13 of the press shoe 11 opposite counter surface 24, which is the press nip 3 on the counter-roller. 2 limited.
  • the mating surface 24 is here formed on the upper side of the elastic covering 17, which engages with the material web 5 facing it (see FIG.
  • the counter-roller 2 also has, in each case at the edge and at a distance adjacent to the effective shoe width 13 of the press shoe 11 opposite mating surface 24 on a radially projecting support ring 25 which forms an abutment for direct support of an outer roll shell portion 28 on the mating roll 2.
  • the radial thickness of the support ring 25 is selected such that a continuous extension of the roll shell 8 between Preßschuh 11 and Endabroughbefest Trent is achieved at the end walls. This is achieved as shown in FIG. 1, characterized in that the radial thickness of the support ring 25 picks up the height of the roll shell 8 in the press nip 3 assumes due to its positioning on the webs 4, 5 and the intermediate fibrous web 6.
  • the support ring 25 thus preferably has a Radial thickness, which transmits the predetermined from the material webs 4, 5 and the fibrous web 6 roll jacket layer in the edge region of the backing roll 2.
  • the axial extent of the support ring 25 extends to the front end of the roll shell 19 of the backing roll 2 and may also extend beyond.
  • the radial thickness of the support ring 25 is preferably only at least press shoe side in the region of a height formed by the fibrous web and the receiving webs of material on the counter-roller, and incidentally falls outwards in each case.
  • the roll shell 8 receives a guide in the direction of attachment to the end wall 9, relative to the roll shell 8 is pressed in the press nip. Since in the interior 10 of the roll shell, preferably an at least slight internal pressure prevails, the roll shell 8 is outside pressed the pressing gap 3 against the support ring 25, as the arrows illustrated in Fig. 2 and 3 illustrate.
  • the support ring 25 is preferably made of a plastic material, in particular epoxy resin or polyamide.
  • the support ring 25 is spaced from the effective shoe width 13 of the press shoe 11 arranged that an end-side freewheeling section for the fibrous web 6 receiving webs 4, 5 remains on the backing roll 2.
  • the counter-roller 2 in the region of the freewheeling section on an annular recess 29.
  • the resting on the counter surface 24 of the backing roll 2 webs 4, 5 then have such a width that they run with freely overhanging ends on the annular recess 29.
  • the above statements apply to Fig. 1 accordingly.
  • Fig. 3 differs from the embodiment shown in FIG. 2, characterized in that the support ring 25 is integrally formed with the elastic covering 17.
  • the above statements apply to Fig. 1 accordingly.

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  • Paper (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The apparatus has a shoe roll (1) with a belt (8) rotating along a stationary support (7) which supports a shoe (11), on a belt (8) whose end sections are fixed to end walls of a support. A radially protruding support ring (25) in a mating roll (2), is arranged axially at a distance from the mating face, to form an opposing bearing for the outer belt support (28), on the mating roll.

Description

Die Erfindung betrifft eine Langspalt-Walzenpresse zum Entwässern einer Faserstoffbahn nach dem Oberbegriff des Anspruchs 1.The invention relates to an extended nip roll press for dewatering a fibrous web according to the preamble of claim 1.

Eine derartige Langspalt-Walzenpresse ist beispielsweise aus der DE 35 03 240 C2 bekannt, die eine angetriebene Gegenwalze aufweist, der ein feststehender Tragkörper mit einem darin geführten Preßschuh zugeordnet ist. Der Preßschuh ist hydraulisch an die Gegenwalze anpreßbar. Um den Tragkörper ist ein endloser Walzenmantel herumgeführt. Der Preßschuh bildet mit dem entsprechenden Walzenabschnitt der Gegenwalze einen verlängerten Preßspalt, durch den die zu entwässernde Faserbahn, eingebettet zwischen Materialbahnen zusammen mit dem Walzenmantel in Bahnlaufrichtung geführt ist. Der Preßschuh weist dazu ein Oberteil auf, das eine Gleitbahn hat, entlang der der Walzenmantel läuft. Die Gleitbahn ist in Abhängigkeit des gewünschten Preßdruckverlaufs über die Preßspaltbreite wählbar und verleiht dem Preßschuh eine wirksame Schuhbreite. Als nachteilig erwiesen hat sich jedoch, daß der Walzenmantel an seiner Bandkante Verformungen erfährt, die den Verschleiß des Walzenmantels erhöhen.Such an extended-nip roller press is known for example from DE 35 03 240 C2, which has a driven counter-roller, which is assigned a fixed support body with a press shoe guided therein. The press shoe is hydraulically pressed against the counter roll. To the support body is passed around an endless roll shell. The press shoe forms with the corresponding roller portion of the backing roll an extended press nip, through which the fiber web to be dewatered, embedded between webs of material is guided together with the roll shell in the web running direction. For this purpose, the press shoe has an upper part which has a slideway along which the roll jacket runs. The slideway is selectable depending on the desired Preßdruckverlaufs on the press nip width and gives the press shoe an effective shoe width. However, it has proved to be disadvantageous that the roll mantle undergoes deformations at its strip edge which increase the wear of the roll mantle.

Aufgabe der Erfindung ist es daher, eine Langspalt-Walzenpresse der genannten Art zu schaffen, deren Walzenmantel einem geringeren Verschleiß unterliegt.The object of the invention is therefore to provide a long-nip roller press of the type mentioned, the roll shell is subject to less wear.

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

Hierdurch wird eine Langspalt-Walzenpresse geschaffen, die den Walzenmantellauf der Langspalt-Preßwalze durch direkte Abstützung eines äußeren Walzenmantelabschnitts an der Gegenwalze stabilisiert, so daß Walzenmantelverformungen vermieden werden. Der Walzenmantel wird in dem Bereich zwischen der wirksamen Schuhbreite des Preßschuhs und der Endabschnittbefestigung durch den Stützring auf eine Umlaufbahn gelenkt, die die Walzenmantelauslenkung randseitig der Preßzone auf den Durchmesser der Stirnwände führt. Ein im wesentlichen knickfreier Übergang des Walzenmantels aus der Preßzone zur jeweiligen Endabschnittbefestigung kann sichergestellt werden. Der Kostenvorteil, der sich durch den Einsatz schmaler Materialbahnen anstelle von alternativ über die gesamte Breite der Gegenwalze sich erstreckenden Materialbahnen ergibt, bleibt erhalten. Vorzugsweise ist der Stützring derart ausgebildet, daß dieser eine kontinuierliche Erstreckung des Walzenmantels außerhalb der Preßzone erlaubt.As a result, an extended-nip roll press is provided which stabilizes the Walzenmantellauf the extended-nip press roll by direct support of an outer roll shell portion of the backing roll, so that Walzenmantelverformungen be avoided. The roll shell is guided in the area between the effective shoe width of the press shoe and the Endabschnittbefestigung by the support ring in an orbit, which leads the Walzenmantelauslenkung edge of the nip on the diameter of the end walls. A substantially kink-free transition of the roll shell from the nip to the respective Endabschnittbefestigung can be ensured. The cost advantage resulting from the use of narrow webs instead of alternatively over the entire width of the backing roll extending webs remains intact. Preferably, the support ring is formed such that it allows a continuous extension of the roll shell outside the nip.

Die Abstützung des Walzenmantels randseitig der Preßzone erfolgt vorzugsweise mittels einer radialen Dicke des Stützringes, die mindestens preßschuhseitig eine Höhe aufweist, die an die im Preßspalt durch die auf der Gegenfläche aufliegenden Materialbahn(en) und die angeordnete Faserstoffbahn bedingte Höhe anschließt. Der Walzenmantel erfährt hierdurch eine Abstützung, die an die im Preßspalt vorgegebene örtliche Lage angepaßt ist. Der Stützring kann darüberhinaus den Walzenmantel nicht nur abstützen, sondern gleichzeitig auch führen, durch eine gezielte radiale Dickenänderung des Stützringes, wodurch die Walzenmantelauslenkung vom Preßspalt zur Endabschnittbefestigung definiert ausgeführt wird. Da der Walzenmantel vorzugsweise unter Verwendung eines zumindest geringen Überdruckes aufgeblasen ist, legt sich der Walzenmantel an den Stützring der Gegenwalze an und folgt dessen Führungsweg im Übergangsbereich zwischen wirksamer Schuhbreite und Endabschnittbefestigung.The support of the roll shell edge side of the nip preferably takes place by means of a radial thickness of the support ring, which has at least beßschuhseitig a height which connects to the in the press nip by the lying on the mating surface material web (s) and the arranged fibrous web conditional height. The roll shell thus undergoes a support which is adapted to the predetermined in the press nip location. The support ring can not only support the roll shell, but also lead simultaneously, by a targeted radial change in thickness of the support ring, whereby the Walzenmantelauslenkung defined by the press nip for Endabschnittbefestigung is executed. Since the roll shell is preferably inflated using at least a slight overpressure, the roll shell attaches itself to the support ring of the counter roll and follows its guide path in the transition region between effective shoe width and Endabschnittbefestigung.

Die Gegenwalze weist ferner im Anschluß an ihre Gegenfläche jeweils eine ringförmige Vertiefung auf, wodurch die Bahnränder der mit der Faserstoffbahn geführten Materialbahn(en) einen Freilauf erhalten. Die als Materialbahn(en) vorzugsweise verwendeten Filze weisen an ihren Bahnrändem vielfach Verdickungen auf, die von Webkanten, Schmelzkanten usw. stammen und damit herstellungsbedingt sind. Zur Vermeidung von Abdrücken auf dem Walzenmantel laufen die Bahnränder daher vorzugsweise über einem Freiraum. Eine hinreichende axiale Erstreckung des Freiraumes stellt sicher, daß bei einer Dehnung oder Verkürzung der Materialbahn im Betrieb die Bahnränder der Materialbahnen über dem Freiraum verbleiben. Zusätzlich vereinfacht der Bahnüberstand die Lageregelung der Materialbahn(en).The mating roll further has, in each case following its mating surface on an annular recess, whereby the web edges of the guided with the fibrous web material web (s) receive a freewheel. The felts preferably used as material web (s) have at their Bahnrändem often thickenings, which originate from selvedges, edges, etc., and thus are production-related. To avoid prints on the roll shell, the web edges therefore preferably run over a free space. A sufficient axial extension of the free space ensures that remain at an elongation or shortening of the web during operation, the web edges of the webs of material over the free space. In addition, the web overhang simplifies the position control of the material web (s).

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

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

  • Fig.1 zeigt schematisch im Längsschnitt eine linke Hälfte einer Gegenwalze und einer Langspalt-Preßwalze einer Langspalt-Walzenpresse gemäß einem ersten Ausführungsbeispiel,
  • Fig. 2 zeigt schematisch im Längsschnitt einen Teilbereich einer linken Hälfte einer Gegenwalze und einer Langspalt-Preßwalze einer Langspalt-Walzenpresse gemäß einem zweiten Ausführungsbeispiel,
  • Fig. 3 zeigt schematisch im Längsschnitt einen Teilbereich einer linken Hälfte einer Gegenwalze und einer Langspalt-Preßwalze einer Langspalt-Walzenpresse gemäß einem dritten Ausführungsbeispiel.
The invention will be explained in more detail with reference to the embodiments illustrated in the accompanying drawings.
  • 1 shows schematically in longitudinal section a left half of a mating roll and an extended nip press roll of an extended-nip roll press according to a first embodiment,
  • 2 shows schematically in longitudinal section a partial region of a left half of a mating roll and an extended nip press roll of an extended-nip roll press according to a second exemplary embodiment,
  • Fig. 3 shows schematically in longitudinal section a portion of a left half of a counter roll and a long nip press roll of an extended-nip roll press according to a third embodiment.

Fig. 1 zeigt eine Langspalt-Walzenpresse zum Entwässern einer Faserstoffbahn, insbesondere einer Papierbahn, die Teil einer Papierherstellungsanlage sein kann. Dargestellt und nachstehend erläutert ist eine linke Hälfte der Langspalt-Walzenpresse. Die rechte Hälfte ist spiegelsymmetrisch zur Trennlinie T ausgebildet, so daß die nachstehenden Ausführungen zur linken Hälfte für die rechte Hälfte entsprechend gelten.Fig. 1 shows an extended-nip roll press for dewatering a fibrous web, in particular a paper web, which may be part of a papermaking plant. Shown and explained below is a left half of the extended-nip roll press. The right half is formed mirror-symmetrically to the dividing line T, so that the following statements apply to the left half for the right half accordingly.

Die Langspalt-Walzenpresse umfaßt eine Langspalt-Preßwalze 1 und eine angetriebene Gegenwalze 2, die in einem Preßspalt 3 zusammenwirken. Durch den Preßspalt 3 ist mindestens eine Materialbahn zusammen mit der zu pressenden Faserstoffbahn geführt. Ist nur eine Materialbahn vorgesehen, handelt es sich um eine sogenannte einfach befilzte Presse. Vorzugsweise sind, wie in den Fig. 1 bis 3 dargestellt, zwei Materialbahnen 4, 5 vorgesehen, zwischen denen die zu pressende Faserstoffbahn 6 geführt ist. Man spricht dann von einer sogenannten doppelt befilzten Presse. Die Materialbahnen 4, 5 bestehen vorzugsweise aus Filzen.The extended-nip roll press comprises an extended-nip press roll 1 and a driven counter-roll 2, which cooperate in a press nip 3. Through the press nip 3, at least one material web is guided together with the fibrous web to be pressed. If only one material web is provided, it is a so-called simply felted press. Preferably, as shown in FIGS. 1 to 3, two webs 4, 5 are provided, between which the fibrous web 6 to be pressed is guided. One speaks then of a so-called double-felted press. The material webs 4, 5 are preferably made of felt.

Die Langspalt-Preßwalze 1 umfaßt einen feststehenden Träger 7 und einen um den Träger drehbaren Walzenmantel 8, der aus einem flexiblen Material, z.B. Gummi oder Kunststoff, besteht. Der Walzenmantel 8 ist schlauchförmig ausgebildet und mit seinen Endabschnitten an drehbar auf dem Träger 7 sitzenden Stirnwänden 9 befestigt, um eine geschlossene Langspalt-Preßwalze 1 zu bilden. Einem Zwischenraum 10 zwischen Träger 7 und Walzenmantel 8 wird vorzugsweise Druckluft zugeführt, wodurch der Walzenmantel 8 aufgeblasen wird, um eine zylindrische Form zu erhalten.The extended-nip press roll 1 comprises a fixed support 7 and a roll shell 8 which can be rotated about the support and consists of a flexible material, eg rubber or plastic. The roll shell 8 is formed tubular and fixed with its end portions on rotatably seated on the support 7 end walls 9 to a closed long-nip press roll. 1 to build. A space 10 between the carrier 7 and roll shell 8 is preferably supplied with compressed air, whereby the roll shell 8 is inflated to obtain a cylindrical shape.

An dem Träger 7 ist ein Preßschuh 11 vorgesehen, der über eine Stützleiste aus einer Mehrzahl beabstandet zueinander angeordneter hydraulischer Stützelemente 12 am Träger 7 abgestützt und in Richtung auf die Gegenwalze 2 anpreßbar ist. Der Preßschuh 11 weist eine wirksame Schuhbreite 13 (vgl. Fig. 2 und Fig. 3) auf, die eine Gleitfläche bildet, auf der sich der Walzenmantel 8 im Bereich des Preßspaltes 3 abstützt. Die Stützelemente 12 sind in bekannter Weise über Druckmittelleitungen 14 an ein hydraulisches Druckmittel, z.B. Öl oder Wasser, angeschlossen.On the support 7, a press shoe 11 is provided, which is supported on a support strip of a plurality of spaced-apart hydraulic support elements 12 on the carrier 7 and can be pressed in the direction of the counter-roller 2. The press shoe 11 has an effective shoe width 13 (compare Fig. 2 and Fig. 3), which forms a sliding surface on which the roll shell 8 is supported in the region of the press nip 3. The support elements 12 are in a known manner via pressure medium lines 14 to a hydraulic pressure means, e.g. Oil or water, connected.

Der Preßschuh 11 bildet mit dem entsprechenden Mantelabschnitt der Gegenwalze 2 den verlängerten Preßspalt 3, durch den die zwei Materialbahnen 4, 5 und die zu entwässernde Faserstoffbahn 6 zusammen mit dem Walzenmantel 8 in einer Bahnlaufrichtung geführt sind.The press shoe 11 forms with the corresponding shell portion of the backing roll 2 the extended press nip 3, through which the two webs 4, 5 and to be dewatered fibrous web 6 are performed together with the roll shell 8 in a web running direction.

Die Gegenwalze 2 ist hier als Biegeausgleichswalze ausgebildet mit einem feststehenden Walzenkern 20 und einem um den Walzenkern 20 drehbaren Walzenmantel 19, der randseitig über Drehlager 21, 22 und längs seiner Mantelfläche über eine Stützleiste hydraulischer Stützelemente 18 am Walzenkern 20 abgestützt ist. Ein Walzenzapfenende 15 ist in einem Lager 16 gelagert. Ein nicht dargestellter Antrieb kann in bekannter Weise am Walzenmantel 19 angreifen. Der Walzenmantel 19 ist ferner vorzugsweise mit einem elastischen Belag 17 versehen. Die hydraulischen Stützelemente 18 sind in bekannter Weise an Druckmittelleitungen 23 angeschlossen.The counter roll 2 is here designed as a bending compensating roll with a fixed roll core 20 and a roll core 20 rotatable roll shell 19, which is supported on the edge side via pivot bearings 21, 22 and along its lateral surface via a support bar hydraulic support elements 18 on the roll core 20. A roll neck end 15 is mounted in a bearing 16. An unillustrated drive can attack the roll shell 19 in a known manner. The roll shell 19 is also preferably provided with an elastic coating 17. The hydraulic support elements 18 are connected in a known manner to pressure medium lines 23.

Die Gegenwalze 2 weist eine der wirksamen Schuhbreite 13 des Preßschuhs 11 gegenüberliegende Gegenfläche 24 auf, die den Preßspalt 3 an der Gegenwalze 2 begrenzt. Die Gegenfläche 24 ist hier an der Oberseite des elastischen Belags 17 ausgebildet, die in Eingriff mit der ihr zugewandten Materialbahn 5 (vgl. Fig. 2) gelangt. Die Gegenwalze 2 weist ferner jeweils randseitig und mit Abstand benachbart der der wirksamen Schuhbreite 13 des Preßschuhs 11 gegenüberliegenden Gegenfläche 24 einen radial vorspringenden Stützring 25 auf, der ein Gegenlager zur direkten Abstützung eines äußeren Walzenmantelabschnitts 28 an der Gegenwalze 2 bildet.The counter-roller 2 has one of the effective shoe width 13 of the press shoe 11 opposite counter surface 24, which is the press nip 3 on the counter-roller. 2 limited. The mating surface 24 is here formed on the upper side of the elastic covering 17, which engages with the material web 5 facing it (see FIG. The counter-roller 2 also has, in each case at the edge and at a distance adjacent to the effective shoe width 13 of the press shoe 11 opposite mating surface 24 on a radially projecting support ring 25 which forms an abutment for direct support of an outer roll shell portion 28 on the mating roll 2.

In dem Übergangsbereich zwischen wirksamer Schuhbreite 13 und Befestigung an der Stirnwand 9 erhält der Walzenmantel 8 an diesem äußeren Walzenmantelabschnitt 28 eine Abstützung. Die radiale Dicke des Stützringes 25 ist derart gewählt, daß eine kontinuierliche Erstreckung des Walzenmantels 8 zwischen Preßschuh 11 und Endabschnittbefestigung an den Stirnwänden erreicht wird. Dies wird gemäß Fig. 1 dadurch erreicht, daß die radiale Dicke des Stützringes 25 die Höhe aufgreift, die der Walzenmantel 8 im Preßspalt 3 einnimmt aufgrund seiner Positionierung auf den Materialbahnen 4, 5 und der zwischenliegenden Faserstoffbahn 6. Der Stützring 25 besitzt also vorzugsweise eine radiale Dicke, die die von den Materialbahnen 4, 5 und der Faserstoffbahn 6 vorgegebene Walzenmantellage in den randseitigen Bereich der Gegenwalze 2 überträgt. Die axiale Erstreckung des Stützringes 25 reicht bis zum stirnseitigen Ende des Walzenmantels 19 der Gegenwalze 2 und kann sich auch darüberhinaus erstrecken.In the transition region between effective shoe width 13 and attachment to the end wall 9 of the roll shell 8 receives at this outer roll shell portion 28 a support. The radial thickness of the support ring 25 is selected such that a continuous extension of the roll shell 8 between Preßschuh 11 and Endabschnittbefestigung is achieved at the end walls. This is achieved as shown in FIG. 1, characterized in that the radial thickness of the support ring 25 picks up the height of the roll shell 8 in the press nip 3 assumes due to its positioning on the webs 4, 5 and the intermediate fibrous web 6. The support ring 25 thus preferably has a Radial thickness, which transmits the predetermined from the material webs 4, 5 and the fibrous web 6 roll jacket layer in the edge region of the backing roll 2. The axial extent of the support ring 25 extends to the front end of the roll shell 19 of the backing roll 2 and may also extend beyond.

Die radiale Dicke des Stützringes 25 liegt vorzugsweise nur mindestens preßschuhseitig im Bereich einer von der Faserstoffbahn und den aufnehmenden Materialbahnen gebildeten Höhe an der Gegenwalze, und fällt im übrigen jeweils nach außen hin ab. Der Walzenmantel 8 erhält eine Führung in Richtung der Befestigung an der Stirnwand 9, gegenüber der der Walzenmantel 8 im Preßspalt eingedrückt ist. Da in dem Innenraum 10 des Walzenmantels vorzugsweise ein zumindest geringfügiger Innendruck herrscht, wird der Walzenmantel 8 außerhalb des Preßspaltes 3 gegen den Stützring 25 gedrückt, wie die in Fig. 2 und 3 dargestellten Pfeile verdeutlichen.The radial thickness of the support ring 25 is preferably only at least press shoe side in the region of a height formed by the fibrous web and the receiving webs of material on the counter-roller, and incidentally falls outwards in each case. The roll shell 8 receives a guide in the direction of attachment to the end wall 9, relative to the roll shell 8 is pressed in the press nip. Since in the interior 10 of the roll shell, preferably an at least slight internal pressure prevails, the roll shell 8 is outside pressed the pressing gap 3 against the support ring 25, as the arrows illustrated in Fig. 2 and 3 illustrate.

Der Stützring 25 besteht vorzugsweise aus einem Kunststoffmaterial, insbesondere Epoxidharz oder Polyamid.The support ring 25 is preferably made of a plastic material, in particular epoxy resin or polyamide.

Gemäß dem in Fig. 2 dargestellten Ausführungsbeispiel ist der Stützring 25 derart beabstandet zur wirksamen Schuhbreite 13 des Preßschuhs 11 angeordnet, daß ein endseitiger Freilaufabschnitt für die die Faserstoffbahn 6 aufnehmenden Materialbahnen 4, 5 an der Gegenwalze 2 verbleibt. Hierzu weist die Gegenwalze 2 im Bereich des Freilaufabschnitts eine ringförmige Vertiefung 29 auf. Die auf der Gegenfläche 24 der Gegenwalze 2 aufliegenden Materialbahnen 4, 5 besitzen dann eine solche Breite, daß sie mit frei überhängende Enden über der ringförmigen Vertiefung 29 laufen. Im übrigen gelten die vorstehenden Ausführungen zu Fig. 1 entsprechend.According to the embodiment shown in Fig. 2, the support ring 25 is spaced from the effective shoe width 13 of the press shoe 11 arranged that an end-side freewheeling section for the fibrous web 6 receiving webs 4, 5 remains on the backing roll 2. For this purpose, the counter-roller 2 in the region of the freewheeling section on an annular recess 29. The resting on the counter surface 24 of the backing roll 2 webs 4, 5 then have such a width that they run with freely overhanging ends on the annular recess 29. Moreover, the above statements apply to Fig. 1 accordingly.

Das in Fig. 3 dargestellte Ausführungsbeispiel unterscheidet sich von dem in Fig. 2 dargestellten Ausführungsbeispiel dadurch, daß der Stützring 25 einstückig ausgebildet ist mit dem elastischen Belag 17. Im übrigen gelten die vorstehenden Ausführungen zu Fig. 1 entsprechend.The embodiment shown in Fig. 3 differs from the embodiment shown in FIG. 2, characterized in that the support ring 25 is integrally formed with the elastic covering 17. In addition, the above statements apply to Fig. 1 accordingly.

Claims (9)

  1. Extended nip press for dewatering a fibrous web guided by at least one material web in a press nip (3), which is formed on one side by a rotating mating roll (2) and on the other side by an extended nip press roll (1), and the extended nip press roll (1) having a stationary support (7) and a flexible roll shell (8) which can rotate around the support and which, in the region of the press nip (3), is supported on a press shoe (11) guided on the support (7) and having an effective shoe width, and the roll shell (8) having end sections which are fixed in a sealing manner to end walls (9) rotatably mounted on the support (7), characterized in that, in each case at the ends and at a distance adjacent to a mating surface (24) opposite the effective shoe width (13) of the press shoe (11), the mating roll (2) has a radially projecting supporting ring (25), which forms a mating bearing for the direct support of an outer roll shell section (28) on the mating roll (2).
  2. Extended nip press according to claim 1, characterized in that the supporting ring (25) in each case has a radial thickness which permits a continuous extent of the roll shell (8) in the region between the press shoe (11) and end section fixing.
  3. Extended nip press according to claim 1 or 2, characterized in that the supporting ring (25) in each case has a radial thickness which, at least on the press shoe side, bears on the mating roll (2) in the region of a height formed by the fibrous web (6) and the material web or webs (4, 5).
  4. Extended nip press according to one of claims 1 to 3, characterized in that the supporting ring (25) has a radial thickness which in each case decreases outwards from the press shoe (11).
  5. Extended nip press according to one of claims 1 to 4, characterized in that the supporting ring (25) is in each case arranged at a distance from the effective shoe width (13) of the press shoe (11) in such a way that an end clearance section remains for the at least one material web (4, 5).
  6. Extended nip press according to claim 5, characterized in that, in the region of the clearance section, the mating roll (2) has an annular depression (29) for the ends of the at least one material web (4, 5) to overhang freely.
  7. Extended nip press according to one of claims 1 to 6, characterized in that the supporting ring (25) is formed in one piece with a resilient cover (17) of the mating roll (2).
  8. Extended nip press according to one of claims 1 to 7, characterized in that the supporting ring (25) in each case consists of a synthetic material.
  9. Extended nip press according to claim 8, characterized in that the synthetic material that can be used is epoxy resin or polyamide.
EP02017876A 2001-08-14 2002-08-09 Extended nip press for dewatering a fibrous web Expired - Lifetime EP1284319B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10138807 2001-08-14
DE10138807A DE10138807C1 (en) 2001-08-14 2001-08-14 Extended nip formation apparatus for calendering paper web, has support ring which is arranged at distance from mating face, to form opposing bearing for outer belt support on mating roll

Publications (2)

Publication Number Publication Date
EP1284319A1 EP1284319A1 (en) 2003-02-19
EP1284319B1 true EP1284319B1 (en) 2006-10-18

Family

ID=7694711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02017876A Expired - Lifetime EP1284319B1 (en) 2001-08-14 2002-08-09 Extended nip press for dewatering a fibrous web

Country Status (4)

Country Link
EP (1) EP1284319B1 (en)
AT (1) ATE343015T1 (en)
DE (2) DE10138807C1 (en)
ES (1) ES2273955T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007039823A (en) * 2005-08-01 2007-02-15 Ichikawa Co Ltd Felt for producing paper

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3503240A1 (en) * 1985-01-31 1986-08-07 J.M. Voith Gmbh, 7920 Heidenheim WET PRESS FOR DRAINING A FIBER TRAIN
DE3607941A1 (en) * 1985-10-30 1987-05-07 Escher Wyss Gmbh Pressing device for dewatering a web of material

Also Published As

Publication number Publication date
ES2273955T3 (en) 2007-05-16
EP1284319A1 (en) 2003-02-19
DE50208477D1 (en) 2006-11-30
DE10138807C1 (en) 2003-01-23
ATE343015T1 (en) 2006-11-15

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