EP1275773B1 - Extended-nip press for dewatering of a fibrous web - Google Patents

Extended-nip press for dewatering of a fibrous web Download PDF

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Publication number
EP1275773B1
EP1275773B1 EP02014909A EP02014909A EP1275773B1 EP 1275773 B1 EP1275773 B1 EP 1275773B1 EP 02014909 A EP02014909 A EP 02014909A EP 02014909 A EP02014909 A EP 02014909A EP 1275773 B1 EP1275773 B1 EP 1275773B1
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EP
European Patent Office
Prior art keywords
press
nip
extended
roll
shoe
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EP02014909A
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German (de)
French (fr)
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EP1275773A1 (en
Inventor
Bernhard Dr. Brendel
Peter Hader
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Andritz Kuesters GmbH
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Eduard Kuesters Maschinenfabrik GmbH and Co KG
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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.
  • a roll press which consists of three rolls arranged approximately one above the other, which form two press nips for the treatment of a material web.
  • a press roll and a counter roll each consist of a roll shell which is rotatable about a stationary support and which is supported by support elements thereon.
  • the direction of action of the support elements of the mating roll slightly by an angle ⁇ , which is between 2 and 5, preferably 4 and 8 °, is inclined from the pressing plane formed with the pressing plane.
  • An extended-nip roll press is known for example from DE 35 03 240 C2, which has a driven counter-roller, which is associated with a fixed support body with a press shoe guided therein.
  • the press shoe can be pressed by means of pressure oil in the direction of the counter roll.
  • To the support body is passed around an endless press jacket.
  • the press shoe forms with the corresponding shell portion of the backing roll an extended press nip, through which the fiber web to be dewatered is guided together with the press cover in the web running direction.
  • the press shoe has to an upper part, which has a slideway along which the press cover runs.
  • the slideway is adapted in dependence of the desired Preßdruckverlaufs on the press nip width to the lateral surface of the counter roll. With regard to the Preß réelleverlaufes one wishes, starting at the inlet into the press nip, an initially gradual increase in the
  • an extended-nip roll press in which the center axes of the support body and the counter-roller lie in a preferably vertical pressing plane, so that the pressing shoe arranged on the support body is displaced laterally parallel to the pressing plane.
  • the raceway of the roll mantle is offset from the direction of travel of the fibrous web offset from the pressing plane and is thus eccentric to the central axis of the support body to further reduce the risk of rewetting.
  • the disadvantage here is that the roller centers are no longer in the stacking plane, whereby the stress and wear of the rotating components, in particular of the flexible roll shell is increased.
  • the object of the invention is therefore to provide a long-nip roller press of the type mentioned, which is simple in construction and can be achieved with the high dry content values in the fibrous web.
  • an extended-nip roller press which is constructed by a tilting of the press shoe with respect to the stack level symmetrically with only one stack level, but shortly before the outlet from the press nip, a sudden drop in the pressure is reached, so that a Remoistening the fibrous web at the outlet of the press nip is largely prevented.
  • a steeper pressure curve is achieved during dewatering, although the press shoe is symmetrical to the load plane.
  • the stress on the roll mantle is reduced and the wear thereof is reduced, since in particular the axis of rotation of the roll mantle can coincide with the centers of rotation of the double-sided roll mantle mounts.
  • the press shoe can be tilted relative to the carrier or the press shoe including the carrier can be tilted, for which purpose the carrier is rotatable about the roller center of the press roller.
  • the acute angle between the stacking and load planes can be selected and is preferably in the range of 1 ° to 5 °.
  • the upper part of the press shoe can also be designed to be longer in the direction of entry relative to a center axis of the press shoe than in the outlet direction, in order to achieve an optimum pressure curve in the press nip.
  • the press shoe may be equipped according to the claims 6 and / or 7 with Hydrauliklastzylindem, which allow an articulated motion compensation of the press shoe relative to the carrier, in particular to compensate for thermal expansion.
  • 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 machine.
  • 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.
  • the extended-nip press roll 1 and the counter-roll 2 define a stack level S with their roll centers.
  • the stack level S runs vertically here.
  • the extended nip press roll 1 and the counter roll 2 may alternatively be arranged so that the stack level S is inclined or horizontal. Through the press nip 3, at least one felt web 4 and the fibrous web 5 to be pressed are guided.
  • the extended-nip press roll 1 comprises a fixed support 6 and a rotatable about the support 6 roll shell 7, which consists of a flexible material, for. As rubber or plastic exists.
  • the roll shell 7 is formed tubular and with its ends on the rotatably seated on the support 6 lid (not shown) attached to form a closed extended-nip press roll 1.
  • a gap 8 between the carrier 6 and roll shell 7 can Compressed air can be supplied, whereby the roll shell 7 can be inflated to obtain a cylindrical shape.
  • This cylindrical shape is required because of the roll jacket transport for the start of work of the extended-nip press roll 1. In operation, the cylindrical shape prevents chattering of the roll shell.
  • the axis of rotation of the roll shell coincides with the centers of rotation of the two-sided roll shell bearings.
  • a press shoe 10 On the carrier 6, a press shoe 10 is provided, which has an upper part 11, on which a sliding surface 9 is formed, on which the roll shell 7 is supported in the region of the press nip 3.
  • the sliding surface 9 is preferably convex in cross-section at the edge and predominantly concave in the support region.
  • the press shoe 10 can be pressed by means of pressure oil in the direction of the counter-roller 2.
  • the press shoe 10 forms with the corresponding shell portion of the backing roll 2 the extended press nip 3, through which the at least one felt web 4 and the fibrous web to be dewatered is guided together with the roll shell 7 in the web running direction.
  • the entrainment of the non-driven roll shell 7 takes place through the webs 5, 4, wherein the sliding surface 9 defines an inlet and an outlet.
  • the outlet direction is indicated in Fig. 1 by the arrow in the driven counter-roller 2.
  • the press nip 3 is hydrodynamically and / or hydrostatically lubricated in a
  • the press shoe 10 comprises a support strip on which the upper part 11 is fixed, which carries the sliding surface 9.
  • the support strip consists of a plurality of mutually spaced, piston-like parts containing Stützanorditch 12, which are respectively supported on the carrier 6.
  • the support arrangements 12 are movable in the direction of the counter-roller 2, due to a pressurization of a pressure chamber 13, which is connected to a hydraulic pressure medium, for example oil or water.
  • a hydraulic pressure medium for example oil or water.
  • the press shoe 10 then defines a load plane L formed by the geometric centerline of the support assemblies 12.
  • the arrangement of the press shoe 10 relative to the stacking plane S is such that the load plane L of the press shoe 10, the stack level S at the center of the counter roll 2 and acute angle to the outlet direction cuts and the press shoe 10 is radially displaceable, along this so aligned to the stack level S load level L.
  • the arrangement of the press shoe 10 can be such that the load plane L is rotated at an angle in the range of 1 ° to 5 ° with respect to the stack level S.
  • the press shoe 10 according to FIG. 1 is tilted on the carrier 6.
  • the upper part 11 is preferably designed such that this is formed longer in the inlet direction compared to the load plane L as in the outlet direction.
  • the formation of the support assemblies 12 as a hydraulic load cylinder can be done as described for example in DE-AS 27 59 035, which is preferred because of the different thermal expansion between the support strip and the support 6 and resulting length differences due to a deflection of the support 6, held tubular piston parts 14 use, which are sealingly and hingedly guided at its two ends, in recesses of a shell connector 15 and a support terminal 16, each forming cylinder sections.
  • the tubular piston parts 14 allow the upper part 11 to tilt relative to the carrier 6.
  • Fig. 2 second embodiment differs from the embodiment shown in FIG. 1, characterized in that the carrier 6 is tilted together with press shoe 10, so that the press shoe 10 along a stacking plane S in the center of the backing roll 2 and acute angle to the outlet direction cutting load plane L is radially displaceable.
  • the carrier 10 is preferably rotated in a frame, not shown, about the center of the extended-nip press roll. The press shoe 10 is then aligned parallel to the carrier 6 arranged on this.
  • Fig. 1 accordingly.
  • Fig. 3 shows a third embodiment, which differs from the first embodiment shown in FIG. 1 differs in that the extended-nip press roll 1 is arranged on the head side of the counter-roller 2, resulting in an overhead press shoe 10. Moreover, the comments on Fig. 1 apply accordingly.
  • Fig. 3 shows that an oil supply 17 is provided at the inlet of the press nip 3 for a hydrodynamic lubrication of the press nip 3.
  • the scraper 18 is preferably disposed in an upper portion of the extended-nip press roll 1 to allow the scrape lubricant to flow into a catch tank 19 by gravity, from where it can be diverted via at least one duct 20.

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

Abstract

A paper making de-watering press has an upper-roller (2) in contact with the flexible mantle (7) of a lower roller (1) together exerting a squeeze on a paper web (5) as this passes between them. The lower roller (1) is supported by a beam (6) with an upper shoe (10) and convex base block (11). The shoe (10) is esp. tilted (L) with its base away from the common centreline (S). The shoe (10) and beam (6) are tilted 1 to 5 degrees. The distance between the web inlet and centreline (S) is longer than the distance between centreline and web release point. The shoe (10) is supported by a number of hydraulic cylinders.

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.

Aus EP 0 745 725 A2 ist eine Walzenpresse bekannt, die aus drei ungefähr übereinander angeordneten Walzen besteht, die zwei Preßspalte zur Behandlung einer Materialbahn bilden. Eine Preßwalze und eine Gegenwalze bestehen jeweils aus einem um einen feststehenden Träger rotierbaren Walzenmantel, der über Stützelemente auf diesem gelagert ist. Als ergänzende Maßnahme ist dabei vorgesehen, daß die Wirkrichtung der Stützelemente der Gegenwalze geringfügig um einen Winkel Δ, der zwischen 2 und 5, vorzugsweise 4 und 8°, liegt, aus der mit der Preßwalze gebildeten Preßebene geneigt ist. Da der Walzenmantel der Gegenwalze an den Enden über Lager auf dem Träger fixiert ist, wirkt sich die aus der Neigung der Stützelemente resultierende Verformung des Walzenmantels der Gegenwalze besonders stark im mittleren Bereich aus, so daß sich der Walzenmantel dort stärker zur dritten Walze hin verformt.From EP 0 745 725 A2 a roll press is known, which consists of three rolls arranged approximately one above the other, which form two press nips for the treatment of a material web. A press roll and a counter roll each consist of a roll shell which is rotatable about a stationary support and which is supported by support elements thereon. As a supplementary measure, it is provided that the direction of action of the support elements of the mating roll slightly by an angle Δ, which is between 2 and 5, preferably 4 and 8 °, is inclined from the pressing plane formed with the pressing plane. Since the roll shell of the counter roll is fixed at the ends via bearings on the carrier, resulting from the inclination of the support elements deformation of the roll shell of the counter roll affects particularly strong in the central region, so that there deforms the roll shell more towards the third roll.

Eine 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 mittels Drucköl in Richtung auf die Gegenwalze anpreßbar. Um den Tragkörper ist ein endloser Preßmantel herumgeführt. Der Preßschuh bildet mit dem entsprechenden Mantelabschnitt der Gegenwalze einen verlängerten Preßspalt, durch den die zu entwässernde Faserbahn zusammen mit dem Preßmantel in Bahnlaufrichtung geführt ist. Der Preßschuh weist dazu ein Oberteil auf, das eine Gleitbahn hat, entlang der der Preßmantel läuft. Die Gleitbahn ist in Abhängigkeit des gewünschten Preßdruckverlaufs über die Preßspaltbreite an die Mantelfläche der Gegenwalze angepaßt. Hinsichtlich des Preßdruckverlaufes wünscht man, beginnend am Einlauf in den Preßspalt, ein zunächst allmähliches Ansteigen desAn extended-nip roll press is known for example from DE 35 03 240 C2, which has a driven counter-roller, which is associated with a fixed support body with a press shoe guided therein. The press shoe can be pressed by means of pressure oil in the direction of the counter roll. To the support body is passed around an endless press jacket. The press shoe forms with the corresponding shell portion of the backing roll an extended press nip, through which the fiber web to be dewatered is guided together with the press cover in the web running direction. The press shoe has to an upper part, which has a slideway along which the press cover runs. The slideway is adapted in dependence of the desired Preßdruckverlaufs on the press nip width to the lateral surface of the counter roll. With regard to the Preßdruckverlaufes one wishes, starting at the inlet into the press nip, an initially gradual increase in the

Preßdrucks bis zu einem Maximum und kurz vor dem Auslauf aus dem Preßspalt ein plötzliches Abfallen des Preßdrucks, um einer Rückbefeuchtung der Faserstoffbahn am Auslauf des Preßspalts entgegenzuwirken. Dazu ist die Mitte der Gleitfläche des Preßschuhs ein Stück weit entgegen der Bahnlaufrichtung neben die Preßebene versetzt, so daß eine unsymmetrische Preßdruckverteilung in Bahnlaufrichtung erzielt wird. Die erzielten Trockengehalte der Faserstoffbahn waren jedoch nicht befriedigend.Pressing pressure up to a maximum and just before the outlet from the press nip, a sudden drop in the pressing pressure to counteract rewetting of the fibrous web at the outlet of the press nip. For this purpose, the center of the sliding surface of the press shoe is offset a little way against the web running direction adjacent to the pressing plane, so that an asymmetrical Preßdruckverteilung is achieved in the web running direction. However, the achieved dry contents of the fibrous web were not satisfactory.

Aus der DE 37 08 189 C2 ist eine Langspalt-Walzenpresse bekannt, bei der die Mittelachsen des Tragkörpers und der Gegenwalze in einer vorzugsweise vertikalen Preßebene liegen, so daß der am Tragkörper angeordnete Preßschuh parallel zur Preßebene seitlich verschiebbar ist. Die Laufbahn des Walzenmantels ist jedoch entgegen der Laufrichtung der Faserstoffbahn aus der Preßebene versetzt angeordnet und liegt damit exzentrisch zur Mittelachse des Tragkörpers, um die Gefahr einer Rückbefeuchtung weiter zu verringern. Nachteilig hierbei ist jedoch, daß die Walzenmittelpunkte nicht mehr in der Stapelebene liegen, wodurch die Beanspruchung und der Verschleiß der sich drehenden Bauteile, insbesondere des flexiblen Walzenmantels erhöht ist.From DE 37 08 189 C2, an extended-nip roll press is known in which the center axes of the support body and the counter-roller lie in a preferably vertical pressing plane, so that the pressing shoe arranged on the support body is displaced laterally parallel to the pressing plane. However, the raceway of the roll mantle is offset from the direction of travel of the fibrous web offset from the pressing plane and is thus eccentric to the central axis of the support body to further reduce the risk of rewetting. The disadvantage here, however, is that the roller centers are no longer in the stacking plane, whereby the stress and wear of the rotating components, in particular of the flexible roll shell is increased.

Aufgabe der Erfindung ist es daher, eine Langspalt-Walzenpresse der genannten Art zu schaffen, die einfach aufgebaut ist und mit der hohe Trockengehaltswerte in der Faserstoffbahn erzielbar sind.The object of the invention is therefore to provide a long-nip roller press of the type mentioned, which is simple in construction and can be achieved with the high dry content values in the fibrous web.

Diese Aufgabe wird durch die Merkmale des kennzeichnenden Teils 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 durch ein Schrägstellen des Preßschuhs gegenüber der Stapelebene symmetrisch mit nur einer Stapelebene aufgebaut ist, trotzdem aber kurz vor dem Auslauf aus dem Preßspalt ein plötzliches Abfallen des Preßdrucks erreicht wird, so daß eine Rückbefeuchtung der Faserstoffbahn am Auslauf des Preßspalts weitgehend verhindert wird. Insbesondere wird ein steilerer Druckverlauf während des Entwässerns erreicht, obwohl der Preßschuh symmetrisch zur Lastebene liegt. Ferner ist die Beanspruchung des Walzenmantels reduziert und der Verschleiß desselben vermindert, da insbesondere die Drehachse des Walzenmantels mit den Drehmittelpunkten der beidseitigen Walzenmantellagerungen zusammenfallen kann.As a result, an extended-nip roller press is created, which is constructed by a tilting of the press shoe with respect to the stack level symmetrically with only one stack level, but shortly before the outlet from the press nip, a sudden drop in the pressure is reached, so that a Remoistening the fibrous web at the outlet of the press nip is largely prevented. In particular, a steeper pressure curve is achieved during dewatering, although the press shoe is symmetrical to the load plane. Furthermore, the stress on the roll mantle is reduced and the wear thereof is reduced, since in particular the axis of rotation of the roll mantle can coincide with the centers of rotation of the double-sided roll mantle mounts.

Der Preßschuh kann gegenüber dem Träger verkippt oder der Preßschuh samt Träger verkippt sein, wozu der Träger um den Walzenmittelpunkt der Preßwalze drehbar ist.The press shoe can be tilted relative to the carrier or the press shoe including the carrier can be tilted, for which purpose the carrier is rotatable about the roller center of the press roller.

Wahlweise in Abhängigkeit von einem gewünschten Anstieg des Druckverlaufs im Preßspalt kann der spitze Winkel zwischen Stapel- und Lastebene gewählt werden und liegt vorzugsweise im Bereich von 1° bis 5°.Optionally, depending on a desired increase in the pressure curve in the press nip, the acute angle between the stacking and load planes can be selected and is preferably in the range of 1 ° to 5 °.

Das Oberteil des Preßschuhs kann zudem gegenüber einer Mittelachse des Preßschuhs in Einlaufrichtung länger ausgebildet sein als in Auslaufrichtung, um eine optimale Druckverlaufskurve im Preßspalt zu erreichen.The upper part of the press shoe can also be designed to be longer in the direction of entry relative to a center axis of the press shoe than in the outlet direction, in order to achieve an optimum pressure curve in the press nip.

Der Preßschuh kann gemäß der Ansprüche 6 und/oder 7 mit Hydrauliklastzylindem ausgestattet sein, die einen gelenkigen Bewegungsausgleich des Preßschuhs gegenüber dem Träger erlauben, insbesondere um Wärmeausdehnungen auszugleichen.The press shoe may be equipped according to the claims 6 and / or 7 with Hydrauliklastzylindem, which allow an articulated motion compensation of the press shoe relative to the carrier, in particular to compensate for thermal expansion.

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 Querschnitt eine Gegenwalze und eine Langspalt-Preßwalze einer Langspalt-Walzenpresse gemäß einem ersten Ausführungsbeispiel,
Fig. 2
zeigt schematisch im Querschnitt eine Gegenwalze und eine Langspalt-Preßwalze einer Langspalt-Walzenpresse gemäß einem zweiten Ausführungsbeispiel,
Fig. 3
zeigt schematisch im Querschnitt eine Gegenwalze und eine 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.
Fig. 1
shows schematically in cross-section a mating roll and an extended-nip press roll of an extended-nip roll press according to a first embodiment,
Fig. 2
shows schematically in cross-section a mating roll and an extended-nip press roll of an extended-nip roll press according to a second embodiment,
Fig. 3
shows schematically in cross-section a counter-roll and an extended-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 Papierherstellungsmaschine sein kann.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 machine.

Die Langspalt-Walzenpresse umfaßt eine Langspalt-Preßwalze 1 und eine angetriebene Gegenwalze 2, die in einem Preßspalt 3 zusammenwirken. Die Langspalt-Preßwalze 1 und die Gegenwalze 2 legen mit ihren Walzenmittelpunkten eine Stapelebene S fest. Die Stapelebene S verläuft hier vertikal. Die Langspalt-Preßwalze 1 und die Gegenwalze 2 können alternativ auch so angeordnet sein, daß die Stapelebene S geneigt oder horizontal verläuft. Durch den Preßspalt 3 ist mindestens eine Filzbahn 4 sowie die zu pressende Faserstoffbahn 5 geführt.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. The extended-nip press roll 1 and the counter-roll 2 define a stack level S with their roll centers. The stack level S runs vertically here. The extended nip press roll 1 and the counter roll 2 may alternatively be arranged so that the stack level S is inclined or horizontal. Through the press nip 3, at least one felt web 4 and the fibrous web 5 to be pressed are guided.

Die Langspalt-Preßwalze 1 umfaßt einen feststehenden Träger 6 und einen um den Träger 6 drehbaren Walzenmantel 7, der aus einem flexiblen Material, z. B. Gummi oder Kunststoff, besteht. Der Walzenmantel 7 ist schlauchförmig ausgebildet und mit seinen Enden am drehbar auf dem Träger 6 sitzenden Deckel (nicht dargestellt) befestigt, um eine geschlossene Langspalt-Preßwalze 1 zu bilden. Einem Zwischenraum 8 zwischen Träger 6 und Walzenmantel 7 kann Druckluft zugeführt werden, wodurch der Walzenmantel 7 aufgeblasen werden kann, um eine zylindrische Form zu erhalten. Diese zylindrische Form ist wegen des Walzenmanteltransportes für den Arbeitsbeginn der Langspalt-Preßwalze 1 erforderlich. Im Betrieb verhindert die zylindrische Form eine Flattern des Walzenmantels. Die Drehachse des Walzenmantels fällt dabei zusammen mit den Drehmittelpunkten der beidseitigen Walzenmantellagerungen.The extended-nip press roll 1 comprises a fixed support 6 and a rotatable about the support 6 roll shell 7, which consists of a flexible material, for. As rubber or plastic exists. The roll shell 7 is formed tubular and with its ends on the rotatably seated on the support 6 lid (not shown) attached to form a closed extended-nip press roll 1. A gap 8 between the carrier 6 and roll shell 7 can Compressed air can be supplied, whereby the roll shell 7 can be inflated to obtain a cylindrical shape. This cylindrical shape is required because of the roll jacket transport for the start of work of the extended-nip press roll 1. In operation, the cylindrical shape prevents chattering of the roll shell. The axis of rotation of the roll shell coincides with the centers of rotation of the two-sided roll shell bearings.

An dem Träger 6 ist ein Preßschuh 10 vorgesehen, der ein Oberteil 11 aufweist, an dem eine Gleitfläche 9 ausgebildet ist, auf der sich der Walzenmantel 7 im Bereich des Preßspaltes 3 abstützt. Die Gleitfläche 9 ist im Querschnitt vorzugsweise randseitig konvex und im Tragbereich überwiegend konkav ausgebildet. Der Preßschuh 10 ist mittels Drucköl in Richtung auf die Gegenwalze 2 anpreßbar. Der Preßschuh 10 bildet mit dem entsprechenden Mantelabschnitt der Gegenwalze 2 den verlängerten Preßspalt 3, durch den die mindestens eine Filzbahn 4 und die zu entwässernde Faserstoffbahn zusammen mit dem Walzenmantel 7 in Bahnlaufrichtung geführt ist. Die Mitnahme des nicht angetriebenen Walzenmantels 7 erfolgt dabei durch die Bahnen 5, 4, wobei die Gleitfläche 9 einen Einlauf und einen Auslauf festlegt. Die Auslaufrichtung ist in Fig. 1 durch den Pfeil in der angetriebenen Gegenwalze 2 angezeigt. Der Preßspalt 3 wird in bekannter Weise hydrodynamisch und/oder hydrostatisch geschmiert.On the carrier 6, a press shoe 10 is provided, which has an upper part 11, on which a sliding surface 9 is formed, on which the roll shell 7 is supported in the region of the press nip 3. The sliding surface 9 is preferably convex in cross-section at the edge and predominantly concave in the support region. The press shoe 10 can be pressed by means of pressure oil in the direction of the counter-roller 2. The press shoe 10 forms with the corresponding shell portion of the backing roll 2 the extended press nip 3, through which the at least one felt web 4 and the fibrous web to be dewatered is guided together with the roll shell 7 in the web running direction. The entrainment of the non-driven roll shell 7 takes place through the webs 5, 4, wherein the sliding surface 9 defines an inlet and an outlet. The outlet direction is indicated in Fig. 1 by the arrow in the driven counter-roller 2. The press nip 3 is hydrodynamically and / or hydrostatically lubricated in a known manner.

Der Preßschuh 10 umfaßt eine Stützleiste, auf der das Oberteil 11 befestigt ist, das die Gleitfläche 9 trägt. Die Stützleiste besteht aus einer Mehrzahl beabstandet zueinander angeordneter, kolbenartige Teile enthaltender Stützanordungen 12, die jeweils am Träger 6 abgestützt sind. Die Stützanordnungen 12 sind in Richtung auf die Gegenwalze 2 bewegbar, aufgrund einer Druckbeaufschlagung eines Druckraumes 13, der an ein hydraulisches Druckmittel, z.B. Öl oder Wasser angeschlossen ist. Der Anschluß der Druckmittelleitungen erfolgt in bekannter Weise.The press shoe 10 comprises a support strip on which the upper part 11 is fixed, which carries the sliding surface 9. The support strip consists of a plurality of mutually spaced, piston-like parts containing Stützanordungen 12, which are respectively supported on the carrier 6. The support arrangements 12 are movable in the direction of the counter-roller 2, due to a pressurization of a pressure chamber 13, which is connected to a hydraulic pressure medium, for example oil or water. The connection of the pressure medium lines takes place in a known manner.

Der Preßschuh 10 definiert danach eine Lastebene L, die von der geometrischen Mittellinie der Stützanordnungen 12 gebildet wird. Die Anordnung des Preßschuhs 10 gegenüber der Stapelebene S erfolgt derart, daß die Lastebene L des Preßschuhs 10 die Stapelebene S im Mittelpunkt der Gegenwalze 2 und spitzwinklig zur Auslaufrichtung hin schneidet und der Preßschuh 10 radial verschiebbar ist, längs dieser derart zur Stapelebene S ausgerichteten Lastebene L. Die Anordnung des Preßschuhs 10 kann derart erfolgen, daß die Lastebene L mit einem Winkel im Bereich von 1° bis 5° gegenüber der Stapelebene S verdreht ist.The press shoe 10 then defines a load plane L formed by the geometric centerline of the support assemblies 12. The arrangement of the press shoe 10 relative to the stacking plane S is such that the load plane L of the press shoe 10, the stack level S at the center of the counter roll 2 and acute angle to the outlet direction cuts and the press shoe 10 is radially displaceable, along this so aligned to the stack level S load level L. The arrangement of the press shoe 10 can be such that the load plane L is rotated at an angle in the range of 1 ° to 5 ° with respect to the stack level S.

Zur Ausrichtung des Preßschuhs 10 gegenüber der Stapelebene S ist der Preßschuh 10 gemäß Fig. 1 am Träger 6 verkippt angeordnet. Das Oberteil 11 ist vorzugsweise derart ausgebildet, daß dieses gegenüber der Lastebene L in Einlaufrichtung länger ausgebildet ist als in Auslaufrichtung.For alignment of the press shoe 10 with respect to the stacking plane S, the press shoe 10 according to FIG. 1 is tilted on the carrier 6. The upper part 11 is preferably designed such that this is formed longer in the inlet direction compared to the load plane L as in the outlet direction.

Die Ausbildung der Stützanordnungen 12 als Hydrauliklastzylinder kann wie beispielsweise in der DE-AS 27 59 035 beschrieben erfolgen, wobei wegen der unterschiedlichen Wärmedehnungen zwischen der Stützleiste und dem Träger 6 sowie entstehender Längendifferenzen aufgrund einer Durchbiegung des Trägers 6 bevorzugt ist, festgehaltene rohrförmige Kolbenteile 14 zu verwenden, die an ihren beiden Enden abdichtend und gelenkig geführt sind, in Ausnehmungen eines Oberteilanschlusses 15 und eines Trägeranschlusses 16, die jeweils Zylinderabschnitte bilden. Die rohrförmigen Kolbenteile 14 erlauben, daß das Oberteil 11 sich gegenüber dem Träger 6 neigen kann.The formation of the support assemblies 12 as a hydraulic load cylinder can be done as described for example in DE-AS 27 59 035, which is preferred because of the different thermal expansion between the support strip and the support 6 and resulting length differences due to a deflection of the support 6, held tubular piston parts 14 use, which are sealingly and hingedly guided at its two ends, in recesses of a shell connector 15 and a support terminal 16, each forming cylinder sections. The tubular piston parts 14 allow the upper part 11 to tilt relative to the carrier 6.

Das in Fig. 2 dargestellte zweite Ausführungsbeispiel unterscheidet sich von dem in Fig. 1 dargestellten Ausführungsbeispiel dadurch, daß der Träger 6 samt Preßschuh 10 verkippt ist, so daß der Preßschuh 10 längs einer die Stapelebene S im Mittelpunkt der Gegenwalze 2 und spitzwinklig zur Auslaufrichtung hin schneidenden Lastebene L radial verschiebbar ist. Der Träger 10 ist dazu vorzugsweise in einer nicht dargestellten Stuhlung um den Mittelpunkt der Langspalt-Preßwalze gedreht. Der Preßschuh 10 ist dann parallel ausgerichtet zum Träger 6 an diesem angeordnet. Im übrigen gelten die vorstehenden Ausführungen zu Fig. 1 entsprechend.The illustrated in Fig. 2 second embodiment differs from the embodiment shown in FIG. 1, characterized in that the carrier 6 is tilted together with press shoe 10, so that the press shoe 10 along a stacking plane S in the center of the backing roll 2 and acute angle to the outlet direction cutting load plane L is radially displaceable. For this purpose, the carrier 10 is preferably rotated in a frame, not shown, about the center of the extended-nip press roll. The press shoe 10 is then aligned parallel to the carrier 6 arranged on this. Moreover, the above statements apply to Fig. 1 accordingly.

Fig. 3 zeigt ein drittes Ausführungsbeispiel, das sich von dem in Fig. 1 dargestellten ersten Ausführungsbeispiel dadurch unterscheidet, daß die Langspalt-Preßwalze 1 kopfseitig der Gegenwalze 2 angeordnet ist, wodurch sich ein obenliegender Preßschuh 10 ergibt. Im übrigen gelten die Ausführungen zu Fig. 1 entsprechend. Ergänzend zeigt Fig. 3, daß für eine hydrodynamische Schmierung des Preßspaltes 3 eine Ölzufuhr 17 am Einlauf des Preßspaltes 3 vorgesehen ist. Mittels eines Schabers 18 ist das auf die Innenseite des Walzenmantels 7 aufgebrachte Schmierrnittel hinter dem Preßspalt 3 wieder abrakelbar. Der Schaber 18 ist vorzugsweise in einem oberen Bereich der Langspalt-Preßwalze 1 angeordnet, um unter Nutzung der Schwerkraft das abgerakelte Schmiermittel in einen Auffangbehälter 19 fließen zu lassen, von wo es über mindestens ein Leitung 20 ableitbar ist.Fig. 3 shows a third embodiment, which differs from the first embodiment shown in FIG. 1 differs in that the extended-nip press roll 1 is arranged on the head side of the counter-roller 2, resulting in an overhead press shoe 10. Moreover, the comments on Fig. 1 apply accordingly. In addition, Fig. 3 shows that an oil supply 17 is provided at the inlet of the press nip 3 for a hydrodynamic lubrication of the press nip 3. By means of a scraper 18, the lubricant applied to the inside of the roll mantle 7 can be stripped off again behind the press nip 3. The scraper 18 is preferably disposed in an upper portion of the extended-nip press roll 1 to allow the scrape lubricant to flow into a catch tank 19 by gravity, from where it can be diverted via at least one duct 20.

Claims (7)

  1. Extended-nip press for dewatering a fibrous web (5) 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), of which the centres of the rolls lie in a stack plane (S), the extended-nip press roll (1) having a stationary support (6) and a flexible roll cover (7) that can be rotated about the support (6), and the cover (7) being supported on the support (6) in the region of the press nip (3) on a sliding surface (9), which is formed on an upper part (11), defining an entry and exit, of a press shoe (10) which can be displaced in a loading direction with respect to the support (6), characterized in that the press shoe (10) can be displaced radially in relation to the mating roll (2) along a loading plane (L) that intersects the stack plane (S) at the centre of the mating roll (2) and at an acute angle to the exit direction.
  2. Extended-nip press according to Claim 1, characterized in that the press shoe (10) is arranged to be tilted on the support (6).
  3. Extended-nip press according to Claim 2, characterized in that the support (6) together with the press shoe (10) is arranged to be tilted.
  4. Extended-nip press according to one of Claims 1 to 3, characterized in that the loading plane (L) is rotated with respect to the stack plane (S) at an acute angle in the range from 1° to 5°.
  5. Extended-nip press according to one of Claims 1 to 4, characterized in that the upper part (11) of the press shoe (10) is designed to be longer in the entry direction with respect to a central axis of the press shoe (10) than in the exit direction.
  6. Extended-nip press according to one of Claims 1 to 5, characterized in that the press shoe (10) comprises a plurality of articulated hydraulic loading cylinders (12) which are arranged spaced apart from one another in the transverse direction, each hydraulic loading cylinder (12) in each case comprising a tubular cylindrical piston element (14) which, at the ends, on one side engages in an articulated manner in a cylinder section (15) on the upper part (11) and, on the other side, engages in an articulated manner in a cylinder section on the support (6).
  7. Extended-nip press according to one of Claims 1 to 6, characterized in that the extended-nip press roll (1) and the mating roll (2) are arranged in a vertical stack plane (S), and the extended-nip press roll (1) is constructed above the mating roll (2) with a press shoe (10) which is located at the top in relation to the press nip (3).
EP02014909A 2001-07-11 2002-07-05 Extended-nip press for dewatering of a fibrous web Expired - Lifetime EP1275773B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10133531 2001-07-11
DE10133531A DE10133531A1 (en) 2001-07-11 2001-07-11 Long nip roller press for dewatering a fibrous web

Publications (2)

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EP1275773A1 EP1275773A1 (en) 2003-01-15
EP1275773B1 true EP1275773B1 (en) 2005-09-21

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Application Number Title Priority Date Filing Date
EP02014909A Expired - Lifetime EP1275773B1 (en) 2001-07-11 2002-07-05 Extended-nip press for dewatering of a fibrous web

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US (1) US6899023B2 (en)
EP (1) EP1275773B1 (en)
JP (1) JP2003049379A (en)
AT (1) ATE305063T1 (en)
CA (1) CA2392926A1 (en)
DE (2) DE10133531A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004004363A1 (en) * 2004-01-29 2005-08-25 Voith Paper Patent Gmbh Extended nip calender
FI118088B (en) * 2004-02-19 2007-06-29 Vaahto Oy Shoe press loading device
CN106626474A (en) * 2017-02-17 2017-05-10 陈家荣 Cotton core transfer compacting mechanism
SE545633C2 (en) 2020-12-07 2023-11-21 Valmet Oy A method for manufacturing a support body arrangement, and a support body arrangement

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT360831B (en) 1977-12-20 1981-02-10 Escher Wyss Ag HYDRAULIC SUPPORT ELEMENT
DE3503240A1 (en) * 1985-01-31 1986-08-07 J.M. Voith Gmbh, 7920 Heidenheim WET PRESS FOR DRAINING A FIBER TRAIN
DE3708189A1 (en) * 1987-03-13 1988-09-22 Voith Gmbh J M LONG NIP ROLLING PRESS
DE3715153A1 (en) * 1987-05-07 1988-12-01 Voith Gmbh J M REINFORCED PRESS SHEATH FOR A PRESS DEVICE FOR TREATING RAIL-SHAPED GOODS, SUCH AS, FOR example, OF PAPER SHEETS, AND METHOD AND DEVICE FOR THE PRODUCTION THEREOF
DE19520443C2 (en) * 1995-06-03 2000-05-31 Voith Sulzer Papiermasch Gmbh Roller press
DE19622018A1 (en) * 1996-05-31 1997-12-04 Voith Sulzer Papiermasch Gmbh Shoe press
DE19631638A1 (en) * 1996-08-05 1998-02-12 Voith Sulzer Papiermasch Gmbh Press arrangement
DE19714939A1 (en) * 1997-04-10 1998-10-15 Voith Sulzer Papiermasch Gmbh Shoe press unit
JP2000119985A (en) * 1998-10-12 2000-04-25 Ishikawajima Harima Heavy Ind Co Ltd Shoe press device for paper machine
DE19920443A1 (en) * 1999-05-04 2000-11-09 Abb Research Ltd Current limiting arrangement with a superconducting transformer

Also Published As

Publication number Publication date
DE50204306D1 (en) 2005-10-27
EP1275773A1 (en) 2003-01-15
US20030024405A1 (en) 2003-02-06
ATE305063T1 (en) 2005-10-15
US6899023B2 (en) 2005-05-31
CA2392926A1 (en) 2003-01-11
JP2003049379A (en) 2003-02-21
DE10133531A1 (en) 2003-01-30

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