EP0822289B2 - Calander - Google Patents

Calander Download PDF

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Publication number
EP0822289B2
EP0822289B2 EP97111725A EP97111725A EP0822289B2 EP 0822289 B2 EP0822289 B2 EP 0822289B2 EP 97111725 A EP97111725 A EP 97111725A EP 97111725 A EP97111725 A EP 97111725A EP 0822289 B2 EP0822289 B2 EP 0822289B2
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EP
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Prior art keywords
roller
rollers
additional
calender
bearing device
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EP97111725A
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German (de)
French (fr)
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EP0822289B1 (en
EP0822289A3 (en
EP0822289A2 (en
Inventor
Gerhard Hartwich
Peter Dornfeld
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Voith Patent GmbH
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Voith Paper Patent GmbH
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00Calenders; Smoothing apparatus

Definitions

  • the invention relates to a calender with a roll stack, which has two end rolls and at least one intermediate roll, the end rolls each having a deflection compensation device acting in the direction of the intermediate roll (cf. EP-0 661 405 A).
  • Such calenders are often designed as supercalenders. They have a plurality of rollers, usually 10 or 12, which are arranged vertically one above the other. The end rollers are arranged in the uppermost and the lowest position. Accordingly, they are also referred to as upper roller or as lower roller.
  • Such calenders serve, for example, for calendering a paper web, i. the paper web is passed through the gaps between adjacent rollers. By suitable means, the rollers are placed under pressure. The paper web is compacted by this treatment on the one hand and on the other hand receives an improved surface quality, such as a higher gloss or better smoothness.
  • pressing means such as hydraulic cylinders, in the direction of the former end roller. Or the upper roll and the lower roll have opposing pressure medium. The resulting deflections can be compensated by the deflection compensation devices, so that all nips take a straight course.
  • the paper producer now often wants to be able to perform a mat-sating.
  • a well-suited for this soft calender is often not available for cost or space reasons, so that the supercalender must also perform this function.
  • one of the rolls mounted in vertically displaceable supports is fastened in its position in the roll stack by a suitable mechanical locking means.
  • All under her vertically moving rollers including trained as deflection roll roller bottom roller are pressed by the hydraulic cylinder against the locked roller upwards.
  • the deflection of the rollers is in turn compensated by the deflection compensation device of the lower roller.
  • the invention has for its object to be able to perform a matte inking operation using such a calender, without being set to the roll-specific contact pressures.
  • This combines a conventional calender with an additional calender, which is suitable for the Mattsatinage ses.
  • a roller is used in common, namely the previously used as the end roll of a calender deflection roll. So there is virtually no additional space required, apart from a slight increase in the height of the new calender. Also, the additional costs to be kept within limits, because no additional stiffening is necessary.
  • the additional expense includes providing the respective end roller with a second deflection compensation device and installing an additional deflection compensation roller. In other words, this fact can also be described by shifting the end roller formed as a deflection adjusting roller by one position and installing a double-sided deflection adjusting roller. But since you can perform with the new calender the mattress sizing operation virtually no definition of pressures that are determined by the one or more rollers, you can take this effort.
  • the contact pressures can now be adjusted within wide ranges. You can drive both at relatively low pressures, because the deflection compensation devices of the end roller and the additional roller can cooperate in any case and ensure that the nip remains straight. If you want to go with a pressure that goes beyond the pressures necessary to compensate for the inherent deflection, then the counteracting deflection compensation devices of the end roll and additional roll worked together. If you want to work with a lower pressure, then you used from the end roll, the deflection compensation device, which acts in the direction of the intermediate roll or the intermediate rolls. This leads to a pressure relief of the nip to the additional roller.
  • the additional roller and the associated end roller have a common bearing device on the machine frame.
  • the machine frame can be, for example, the stiffening of the calender or the calender stand.
  • At least one of the rollers on the bearing device relative to the other roller is displaceable.
  • the nip between the two rollers can be opened, so that the additional roller is actually operated only when the matte transfer operation is performed.
  • the additional roller has a carrier which is supported via a hydraulic cylinder to the bearing device.
  • This training has two advantages. On the one hand, the end roller is fixedly arranged on the bearing device, so that in the roller control compared to a conventional calender practically no changes must be made. On the other hand, the additional roller is displaceable overall, so not only her coat. This simplifies the structure.
  • At least one of the rollers of the roller pair of additional roller and end roller has its own rotary drive. Mattsatinage ses can then be performed without third-party drives.
  • the rotary drive is arranged on the bearing device and connected to the stationary on the bearing means arranged roller. It is then possible to provide a rigid connection between the rotary drive and the roller, because the positions of roller and rotary drive do not change relative to one another.
  • the storage device is movably arranged on the machine frame. This is particularly advantageous when the additional roller is provided in the region of the lower roller. One can then, if one carries out the matte sating operation, separate the end roller from the other intermediate rollers, so that their wear remains low.
  • one roll has a soft surface and the other roll has a hard surface from the roll pair formed from the additional roll and the end roll. You can then realize a soft calender with the help of the additional roller, which has proven itself for the mat satin in and of itself.
  • a calender 1 has a frame 2, in which a roll stack 3 is arranged.
  • the roll stack has a top roll 4, a bottom roll 5 and a plurality of intermediate rolls 6 7.
  • For web guide several guide rollers are provided.
  • the upper roller 4 and the lower roller 5 are collectively referred to as end rollers.
  • the top roller 4 and the bottom roller 5 are formed as deflection compensating rollers. They each have deflection compensation devices 8, 9, which act in the direction of the intermediate rollers 6.
  • the intermediate rollers 6 and the lower roller 5 are movable relative to the frame 2.
  • the top roller 4 is detected on the frame.
  • the intermediate rolls are fastened to the frame 2 via bearings which are not shown in detail.
  • the lower roller 5 is arranged in a bearing device 10, which can be driven by means of a hydraulic cylinder 11 upwards. Once all the nips between the intermediate rolls 6 and the lower roll 5 and upper roll 4 are closed, the hydraulic cylinder 11 can also be used to increase the pressure in the nips.
  • a deflection of the rollers 4, 5, 6 is compensated by the deflection compensation devices 8, 9.
  • an additional roller 12 is also arranged, which is also designed as a deflection compensating roller and accordingly has a deflection compensating device 13.
  • This deflection compensating device 13 acts in the direction of the lower roller 5.
  • the lower roller 5 additionally has a second deflection compensating device 14, which acts in the direction of the additional roller 12.
  • All deflection compensating devices 8, 9, 13, 14 can be formed, for example, by hydrostatically acting sliding shoes, which are supported on a carrier, not shown, which passes through the rollers 4, 5, 12 axially.
  • the additional roller 12 is displaceable on the bearing device 10 in the vertical direction. It can therefore be moved relative to the lower roller 5. In the position shown in Fig. 1, it leaves a nip 15 to the lower roller 5 open. However, the bearing device 10 has been moved so far in the direction of the top roller 4 that all other nips are closed. The paper web 16 to be treated can then be calendered in normal operation.
  • the paper web 16 is guided only through the nip 15. It is satin finished there.
  • either the lower roller 5 or the additional roller 12 is provided with a soft surface.
  • the corresponding other roller then has a hard surface.
  • the deflection compensation device 13 and the deflection compensation device 9 are put into operation.
  • the deflection compensation device 9 prevents the lower roller 5 from bending downwards when the additional roller 12 no longer applies the necessary back pressure.
  • Fig. 3 shows the possibility of having the additional roller 12 also cooperate with the upper roller 4.
  • the upper roller 2 has deflection compensation devices 8, 14, the latter, although it also acts away from the intermediate rollers 6, but this time upwards.
  • the deflection compensation device 13 of the auxiliary roller 12 acts downward, i. in the direction of the intermediate rollers 6 back.
  • the bearing device 10 has a carriage 18, which is arranged vertically displaceable on the frame 2. To drive the carriage 18 is the hydraulic cylinder 11, which is set in Fig. 4 under pressure and relieved in Fig. 5.
  • roller carrier 19 On the carriage 18, a roller support 19 is first arranged stationary.
  • the roller carrier 19 carries the lower roller 5. It additionally has a roller turning drive 20, which is rigidly connected to the lower roller 5.
  • a further hydraulic cylinder 21 is additionally provided, which is relieved in Fig. 4 and set in Fig. 5 under pressure.
  • a carrier 22 is arranged, which passes through the additional roller 12 axially.
  • the elements of the deflection compensation device 13 are supported. With the help of the hydraulic cylinder 21, the nip 15 between the lower roller 5 and the additional roller 12 can be opened or closed.
  • the hydraulic cylinder 21 may be smaller than the hydraulic cylinder 11, since it only has to displace the auxiliary roller 12 with respect to the lower roller 5. However, the hydraulic cylinder 11 must be able to lift the lower roller 5 and all intermediate rollers 6.

Description

Die Erfindung betrifft einen Kalander mit einem Walzenstapel, der zwei Endwalzen und mindestens eine Zwischenwalze aufweist, wobei die Endwalzen jeweils eine in Richtung auf die Zwischenwalze wirkenden Durchbiegeausgleichseinrichtungen aufweisen (vgl - EP-0 661 405 A).The invention relates to a calender with a roll stack, which has two end rolls and at least one intermediate roll, the end rolls each having a deflection compensation device acting in the direction of the intermediate roll (cf. EP-0 661 405 A).

Derartige Kalander sind vielfach als Superkalander ausgebildet. Sie weisen eine Vielzahl von Walzen auf, in der Regel 10 oder 12, die vertikal übereinander angeordnet sind. Die Endwalzen sind hierbei in der obersten und der untersten Position angeordnet. Sie werden dementsprechend auch als Oberwalze bzw. als Unterwalze bezeichnet.Such calenders are often designed as supercalenders. They have a plurality of rollers, usually 10 or 12, which are arranged vertically one above the other. The end rollers are arranged in the uppermost and the lowest position. Accordingly, they are also referred to as upper roller or as lower roller.

Derartige Kalander dienen beispielsweise zum Satinieren einer Papierbahn, d.h. die Papierbahn wird durch die Spalte zwischen benachbarten Walzen geleitet. Durch geeignete Mittel werden die Walzen unter Druck aneinandergelegt. Die Papierbahn wird durch diese Behandlung einerseits verdichtet und erhält andererseits eine verbesserte Oberflächenqualität, beispielsweise einen höheren Glanz oder eine bessere Glätte. Zum Anpressen wird entweder eine der beiden Endwalzen festgelegt und die andere Walze durch Anpreßmittel, beispielsweise Hydraulikzylinder, in Richtung auf die erstgenannte Endwalze gepreßt. Oder die Oberwalze und die Unterwalze weisen gegeneinander wirkende Druckmittel auf. Die sich dabei ergebenden Durchbiegungen können durch die Durchbiegeausgleichseinrichtungen kompensiert werden, so daß alle Walzenspalte einen geradlinigen Verlauf annehmen.Such calenders serve, for example, for calendering a paper web, i. the paper web is passed through the gaps between adjacent rollers. By suitable means, the rollers are placed under pressure. The paper web is compacted by this treatment on the one hand and on the other hand receives an improved surface quality, such as a higher gloss or better smoothness. For pressing either one of the two end rollers is set and pressed the other roller by pressing means, such as hydraulic cylinders, in the direction of the former end roller. Or the upper roll and the lower roll have opposing pressure medium. The resulting deflections can be compensated by the deflection compensation devices, so that all nips take a straight course.

Der Papierproduzent möchte nun vielfach auch eine Mattsatinage durchführen können. Ein hierfür gut geeigneter Softkalander steht oft aus Kosten- oder Platzgründen nicht zur Verfügung, so daß der Superkalander diese Funktion zusätzlich wahrnehmen muß.The paper producer now often wants to be able to perform a mat-sating. A well-suited for this soft calender is often not available for cost or space reasons, so that the supercalender must also perform this function.

Hierzu wird eine der in vertikal verschiebbaren Supporten gelagerten Walzen, in der Regel eine der Zwischenwalzen, im Walzenstapel durch ein geeignetes mechanisches Arretierungsmittel in ihrer Position befestigt. Alle unter ihr liegenden vertikal beweglichen Walzen einschließlich der als Durchbiegeausgleichswalze ausgebildeten Unterwalze werden durch den Hydraulikzylinder gegen die arretierte Walze nach oben gedrückt. Die Durchbiegung der Walzen wird wiederum durch die Durchbiegeausgleichseinrichtung der Unterwalze kompensiert.For this purpose, one of the rolls mounted in vertically displaceable supports, as a rule one of the intermediate rolls, is fastened in its position in the roll stack by a suitable mechanical locking means. All under her vertically moving rollers including trained as deflection roll roller bottom roller are pressed by the hydraulic cylinder against the locked roller upwards. The deflection of the rollers is in turn compensated by the deflection compensation device of the lower roller.

Dieses Vorgehen hat einige Nachteile: Vielfach kann man nicht die unmittelbar über der Unterwalze liegende Walze arretieren, so daß mehrere, nicht direkt am Satinageprozeß beteiligte Walzen angetrieben werden müssen und entsprechend verschleißen. Schwerwiegender ist allerdings der Nachteil, daß der Satinagedruck praktisch nicht veränderbar ist. Er kann nur so groß sein, daß die Durchbiegung der einzelnen Walzen korrigiert wird. Mit anderen Worten kann die Anpreßkraft der nun arbeitenden Walzen nur so groß sein, wie es die Kompensation der Eigenlastdurchbiegung der arretieren Mittelwalze gestattet. Die Anpreßkraft ist also durch das Gewicht und die Breite sowie die Steifigkeit der arretierten Mittelwalzen festgelegt. Eine Veränderung der Anpreßkraft im arbeitenden Walzenspalt kann nicht vorgenommen werden, weil dies zu einer Asymmetrie des auf die Waltenbreite gemessenen Anpreßdrucks und mithin zu einer Walzgutentstellung führen würde. Wenn der Anpreßdruck zu groß wird, biegt sich die arretierte Walze nach oben durch. Wird er hingegen zu klein gewählt, biegt sie sich nach unten durch.This approach has some disadvantages: In many cases you can not lock the roller directly above the lower roller, so that several, not directly involved in the calendering process rollers must be driven and wear accordingly. More serious, however, is the disadvantage that the calendering pressure is practically unchangeable. It can only be so large that the deflection of the individual rolls is corrected. In other words, the contact pressure of the now working rollers can only be as large as it allows the compensation of the dead load deflection of the locking center roller. The contact pressure is thus determined by the weight and the width and the rigidity of the locked center rollers. A change in the contact pressure in the working nip can not be made, because this would lead to an asymmetry of the contact pressure measured on the width and thus to Walzgutentstellung. If the contact pressure is too high, the locked roller bends upwards. If he is chosen too small, it bends down through.

Der Erfindung liegt die Aufgabe zugrunde, einen Mattsatinagebetrieb mit Hilfe eines derartigen Kalanders durchführen zu können, ohne auf die walzenspezifischen Anpreßdrücke festgelegt zu sein.The invention has for its object to be able to perform a matte inking operation using such a calender, without being set to the roll-specific contact pressures.

Diese Aufgabe wird durch einen Kalander der eingangs genannten Art mit den Merkmalen des kennzeichnenden Teils des Anspruchs 1 gelöst.This object is achieved by a calender of the type mentioned with the features of the characterizing part of claim 1.

Dadurch kombiniert man einen herkömmlichen Kalander mit einem zusätzlichen Kalander, der für den Mattsatinagebetrieb geeignet ist. Hierfür wird eine Walze gemeinsam verwendet, nämlich die bislang als Endwalze des einen Kalanders dienende Durchbiegeausgleichswalze. Es ist also praktisch kein zusätzlicher Bauraum notwendig, wenn man von einer geringfügigen Vergrößerung der Höhe des neuen Kalanders absieht. Auch die zusätzlich aufzubringenden Kosten halten sich in Grenzen, weil keine zusätzliche Stuhlung notwendig ist. Der zusätzliche Aufwand beinhaltet zwar, daß man die betreffende Endwalze mit einer zweiten Durchbiegeausgleichseinrichtung versieht und eine zusätzliche Durchbiegeausgleichswalze einbaut. Anders ausgedrückt, läßt sich dieser Sachverhalt auch dadurch beschreiben, daß man die als Durchbiegeeinstellwalze ausgebildete Endwalze um eine Position verschiebt und eine zweiseitig wirkende Durchbiegeeinstellwalze einbaut. Da man aber mit dem neuen Kalander den Mattsatinagebetrieb praktisch ohne Festlegung auf Drücke durchführen kann, die von der oder den Walzen bestimmt werden, kann man diesen Aufwand hinnehmen.This combines a conventional calender with an additional calender, which is suitable for the Mattsatinagebetrieb. For this purpose, a roller is used in common, namely the previously used as the end roll of a calender deflection roll. So there is virtually no additional space required, apart from a slight increase in the height of the new calender. Also, the additional costs to be kept within limits, because no additional stiffening is necessary. Although the additional expense includes providing the respective end roller with a second deflection compensation device and installing an additional deflection compensation roller. In other words, this fact can also be described by shifting the end roller formed as a deflection adjusting roller by one position and installing a double-sided deflection adjusting roller. But since you can perform with the new calender the mattress sizing operation virtually no definition of pressures that are determined by the one or more rollers, you can take this effort.

Die Anpreßdrücke können nun nämlich in weiten Bereichen verstellt werden. Man kann sowohl mit relativ niedrigen Drücken fahren, weil die Durchbiegeausgleichseinrichtungen der Endwalze und der Zusatzwalze auf jeden Fall zusammenwirken können und dafür sorgen, daß der Walzenspalt gerade bleibt. Wenn man mit einem Druck fahren möchte, der über die zur Kompensierung der Eigendurchbiegung notwendigen Drücke hinausgeht, dann arbeiteten die gegeneinander wirkenden Durchbiegeausgleichseinrichtungen von Endwalze und Zusatzwalze zusammen. Wenn man mit einem geringeren Druck arbeiten möchte, dann verwendet man von der Endwalze die Durchbiegeausgleichseinrichtung, die in Richtung auf die Zwischenwalze oder die Zwischenwalzen wirkt. Dies führt zu einer Druckentlastung des Walzenspalts zur Zusatzwalze hin.The contact pressures can now be adjusted within wide ranges. You can drive both at relatively low pressures, because the deflection compensation devices of the end roller and the additional roller can cooperate in any case and ensure that the nip remains straight. If you want to go with a pressure that goes beyond the pressures necessary to compensate for the inherent deflection, then the counteracting deflection compensation devices of the end roll and additional roll worked together. If you want to work with a lower pressure, then you used from the end roll, the deflection compensation device, which acts in the direction of the intermediate roll or the intermediate rolls. This leads to a pressure relief of the nip to the additional roller.

Die Zusatzwalze und die zugehörige Endwalze weisen eine gemeinsame Lagereinrichtung am Maschinengestell auf. Das Maschinengestell kann beispielsweise die Stuhlung des Kalanders oder der Kalanderständer sein. Durch diese Ausgestaltung wird das Betriebsverhalten des Kalanders ansonsten nur unwesentlich geändert. Insbesondere beim Einbau der Zusatzwalze im Bereich der Unterwalze hat diese Ausgestaltung sogar Vorteile, weil dadurch die Unterwalze mit einem zusätzlichen Gewicht versehen wird, das das Absenken dieser Unterwalze beschleunigt, wenn die Walzen des Kalanders getrennt werden müssen.The additional roller and the associated end roller have a common bearing device on the machine frame. The machine frame can be, for example, the stiffening of the calender or the calender stand. By this configuration, the performance of the calender is otherwise changed only slightly. In particular, when installing the additional roller in the lower roller area, this embodiment even has advantages because it provides the lower roller with an additional weight which accelerates the lowering of this lower roller when the rollers of the calender must be separated.

Vorzugsweise ist mindestens eine der Walzen auf der Lagereinrichtung gegenüber der anderen Walze verlagerbar. Hierdurch läßt sich der Walzenspalt zwischen den beiden Walzen öffnen, so daß die Zusatzwalze tatsächlich nur dann betrieben wird, wenn der Mattsatinagebetrieb durchgeführt wird.Preferably, at least one of the rollers on the bearing device relative to the other roller is displaceable. As a result, the nip between the two rollers can be opened, so that the additional roller is actually operated only when the matte transfer operation is performed.

Hierbei ist besonders bevorzugt, daß die Zusatzwalze einen Träger aufweist, der über einen Hydraulikzylinder an der Lagereinrichtung abgestützt ist. Durch diese Ausbildung hat man zwei Vorteile. Zum einen ist die Endwalze fest an der Lagereinrichtung angeordnet, so daß man bei der Walzensteuerung gegenüber einem herkömmlichen Kalander praktisch keine Änderungen durchführen muß. Zum anderen ist die Zusatzwalze insgesamt verschiebbar, also nicht nur ihr Mantel. Dies vereinfacht den Aufbau.It is particularly preferred that the additional roller has a carrier which is supported via a hydraulic cylinder to the bearing device. This training has two advantages. On the one hand, the end roller is fixedly arranged on the bearing device, so that in the roller control compared to a conventional calender practically no changes must be made. On the other hand, the additional roller is displaceable overall, so not only her coat. This simplifies the structure.

Vorzugsweise weist mindestens eine der Walzen des Walzenpaares aus Zusatzwalze und Endwalze einen eigenen Drehantrieb auf. Der Mattsatinagebetrieb kann dann ohne Fremdantriebe durchgeführt werden.Preferably, at least one of the rollers of the roller pair of additional roller and end roller has its own rotary drive. Mattsatinagebetrieb can then be performed without third-party drives.

Hierbei ist besonders bevorzugt, daß der Drehantrieb an der Lagereinrichtung angeordnet und mit der ortsfest auf der Lagereinrichtung angeordneten Walze verbunden ist. Man kann dann eine starre Verbindung zwischen dem Drehantrieb und der Walze vorsehen, weil sich die Positionen von Walze und Drehantrieb relativ zueinander nicht ändern.It is particularly preferred that the rotary drive is arranged on the bearing device and connected to the stationary on the bearing means arranged roller. It is then possible to provide a rigid connection between the rotary drive and the roller, because the positions of roller and rotary drive do not change relative to one another.

Vorteilhafterweise ist die Lagereinrichtung am Maschinengestell beweglich angeordnet. Dies ist insbesondere dann von Vorteil, wenn die Zusatzwalze im Bereich der Unterwalze vorgesehen wird. Man kann dann, wenn man den Mattsatinagebetrieb durchführt, die Endwalze von den übrigen Zwischenwalzen trennen, so daß deren Verschleiß gering bleibt.Advantageously, the storage device is movably arranged on the machine frame. This is particularly advantageous when the additional roller is provided in the region of the lower roller. One can then, if one carries out the matte sating operation, separate the end roller from the other intermediate rollers, so that their wear remains low.

Auch ist bevorzugt, daß von dem aus Zusatzwalze und Endwalze gebildeten Walzenpaar eine Walze eine weiche und die andere Walze eine harte Oberfläche aufweist. Man kann dann mit Hilfe der Zusatzwalze einen Softkalander realisieren, der sich für die Mattsatinage an und für sich bewährt hat.It is also preferred that one roll has a soft surface and the other roll has a hard surface from the roll pair formed from the additional roll and the end roll. You can then realize a soft calender with the help of the additional roller, which has proven itself for the mat satin in and of itself.

Die Erfindung wird im folgenden anhand bevorzugten Ausführungsbeispielen in Verbindung mit der Zeichnung beschrieben. Hierin zeigen:

Fig. 1
einen Kalander im Normalbetrieb,
Fig. 2
den Kalander bei der Mattsatinage,
Fig. 3
eine abgewandelte Form des Kalanders mit Zusatzwalze in oberster Position,
Fig. 4
eine Detailansicht des unteren Endes des Kalanders in der Betriebsweise nach Fig. 1 und
Fig. 5
die Detailansicht des Kalanders in der Betriebsweise nach Fig. 2.
The invention will be described below with reference to preferred embodiments in conjunction with the drawings. Herein show:
Fig. 1
a calender in normal operation,
Fig. 2
the calender at the mat,
Fig. 3
a modified form of the calender with additional roller in the uppermost position,
Fig. 4
a detail view of the lower end of the calender in the operation of Fig. 1 and
Fig. 5
the detailed view of the calender in the operation of FIG. 2.

Ein Kalander 1 weist ein Gestell 2 auf, in dem ein Walzenstapel 3 angeordnet ist. Der Walzenstapel weist eine Oberwalze 4, eine Unterwalze 5 und mehrere Zwischenwalzen 6 7 auf. Zur Bahnführung sind mehrere Leitwalzen vorgesehen. Die Oberwalze 4 und die Unterwalze 5 werden zusammenfassend auch als Endwalzen bezeichnet.A calender 1 has a frame 2, in which a roll stack 3 is arranged. The roll stack has a top roll 4, a bottom roll 5 and a plurality of intermediate rolls 6 7. For web guide several guide rollers are provided. The upper roller 4 and the lower roller 5 are collectively referred to as end rollers.

Die Oberwalze 4 und die Unterwalze 5 sind als Durchbiegeausgleichswalzen ausgebildet. Sie weisen jeweils Durchbiegeausgleichseinrichtungen 8, 9 auf, die in Richtung auf die Zwischenwalzen 6 wirken.The top roller 4 and the bottom roller 5 are formed as deflection compensating rollers. They each have deflection compensation devices 8, 9, which act in the direction of the intermediate rollers 6.

Die Zwischenwalzen 6 und die Unterwalze 5 sind relativ zu dem Gestell 2 beweglich. Die Oberwalze 4 ist am Gestell festgestellt. Die Zwischenwalzen sind hierzu über nicht näher dargestellte Lager am Gestell 2 befestigt. Die Unterwalze 5 ist in einer Lagereinrichtung 10 angeordnet, die mit Hilfe eines Hydraulikzylinders 11 nach oben gefahren werden kann. Sobald sämtliche Walzenspalte zwischen den Zwischenwalzen 6 und der Unterwalze 5 bzw. der Oberwalze 4 geschlossen sind, kann der Hydraulikzylinder 11 auch dazu verwendet werden, den Druck in den Walzenspalten zu erhöhen. Eine Durchbiegung der Walzen 4, 5, 6 wird durch die Durchbiegeausgleichseinrichtungen 8, 9 kompensiert.The intermediate rollers 6 and the lower roller 5 are movable relative to the frame 2. The top roller 4 is detected on the frame. For this purpose, the intermediate rolls are fastened to the frame 2 via bearings which are not shown in detail. The lower roller 5 is arranged in a bearing device 10, which can be driven by means of a hydraulic cylinder 11 upwards. Once all the nips between the intermediate rolls 6 and the lower roll 5 and upper roll 4 are closed, the hydraulic cylinder 11 can also be used to increase the pressure in the nips. A deflection of the rollers 4, 5, 6 is compensated by the deflection compensation devices 8, 9.

An der Lagereinrichtung 10 ist darüber hinaus eine Zusatzwalze 12 angeordnet, die ebenfalls als Durchbiegeausgleichswalze ausgebildet ist und dementsprechend eine Durchbiegeausgleichseinrichtung 13 aufweist. Diese Durchbiegeausgleichseinrichtung 13 wirkt in Richtung auf die Unterwalze 5.On the bearing device 10, an additional roller 12 is also arranged, which is also designed as a deflection compensating roller and accordingly has a deflection compensating device 13. This deflection compensating device 13 acts in the direction of the lower roller 5.

Die Unterwalze 5 weist zusätzlich eine zweite Durchbiegeausgleichseinrichtung 14 auf, die in Richtung auf die Zusatzwalze 12 wirkt.The lower roller 5 additionally has a second deflection compensating device 14, which acts in the direction of the additional roller 12.

Alle Durchbiegeausgleichseinrichtungn 8, 9, 13, 14 können beispielsweise durch hydrostatisch wirkende Gleitschuhe gebildet sein, die auf einem nicht näher dargestellten Träger abgestützt sind, der die Walzen 4, 5, 12 axial durchsetzt.All deflection compensating devices 8, 9, 13, 14 can be formed, for example, by hydrostatically acting sliding shoes, which are supported on a carrier, not shown, which passes through the rollers 4, 5, 12 axially.

Die Zusatzwalze 12 ist auf der Lagereinrichtung 10 in vertikaler Richtung verschiebbar. Sie kann also relativ zur Unterwalze 5 verschoben werden. In der in Fig. 1 dargestellten Position läßt sie einen Walzenspalt 15 zur Unterwalze 5 hin offen. Die Lagereinrichtung 10 ist aber so weit in Richtung auf die Oberwalze 4 verschoben worden, daß alle übrigen Walzenspalte geschlossen sind. Die zu behandelnde Papierbahn 16 kann dann im Normalbetrieb kalandriert werden.The additional roller 12 is displaceable on the bearing device 10 in the vertical direction. It can therefore be moved relative to the lower roller 5. In the position shown in Fig. 1, it leaves a nip 15 to the lower roller 5 open. However, the bearing device 10 has been moved so far in the direction of the top roller 4 that all other nips are closed. The paper web 16 to be treated can then be calendered in normal operation.

Fig. 2 zeigt nun eine andere Betriebsweise, bei der alle Walzenspalte, insbesondere ein Walzenspalt 17 zwischen der Unterwalze 5 und der nächstfolgenden Zwischenwalze 6, geöffnet sind. Dafür ist der Walzenspalt 15 geschlossen, d.h. die Zusatzwalze 12 liegt unter Zwischenlage der Papierbahn 16 an der Unterwalze 5 an. Der Hydraulikzylinder 11 kann hierbei eingefahren sein. Wie im Zusammenhang mit den Fig. 4 und 5 erläutert werden wird, ist an der Lagereinrichtung 10 ein eigener Hydraulikzylinder vorgesehen, der zum Verlagern der Zusatzwalze 12 auf der Lagereinrichtung dient.2 now shows another mode of operation, in which all nips, in particular a nip 17 between the lower roll 5 and the next following intermediate roll 6, are opened. For this, the nip 15 is closed, i. the additional roller 12 is located with the interposition of the paper web 16 on the lower roller 5. The hydraulic cylinder 11 can be retracted here. As will be explained in connection with FIGS. 4 and 5, a separate hydraulic cylinder is provided on the bearing device 10, which serves for displacing the additional roller 12 on the bearing device.

In der in Fig. 2 dargestellten Betriebsweise wird die Papierbahn 16 nur durch den Walzenspalt 15 geführt. Sie wird dort matt satiniert. Zu diesem Zweck ist entweder die Unterwalze 5 oder die Zusatzwalze 12 mit einer weichen Oberfläche versehen. Die entsprechend andere Walze weist dann eine harte Oberfläche auf.In the mode of operation shown in FIG. 2, the paper web 16 is guided only through the nip 15. It is satin finished there. For this purpose, either the lower roller 5 or the additional roller 12 is provided with a soft surface. The corresponding other roller then has a hard surface.

Die Drücke, die im Walzenspalt 15 herrschen, lassen sich nun in weiten Grenzen beliebig einstellen.The pressures that prevail in the nip 15 can now be set arbitrarily within wide limits.

Einerseits kann man, wie bisher auch, einen Druck ein-. stellen, der die Eigendurchbiegung der Unterwalze 5 kompensiert. In diesem Fall werden nur die Durchbiegeausgleichseinrichtungen 13 der Zusatzwalze 12 betätigt. Wenn man einen höheren Druck erzeugen will, wird sowohl die Durchbiegeausgleichseinrichtung 13 als auch die Durchbiegeausgleichseinrichtung 14 in Betrieb genommen. Neben der Funktion, den Walzenspalt zu begradigen, haben sie die Funktion, die notwendigen Drücke zu erzeugen.On the one hand, you can, as before, a pressure on. provide, which compensates the self-deflection of the lower roller 5. In this case, only the deflection compensation devices 13 of the additional roller 12 are actuated. If one wants to generate a higher pressure, both the deflection compensation device 13 and the deflection compensation device 14 are put into operation. In addition to the function of straightening the nip, they have the function of generating the necessary pressures.

Möchte man hingegen niedrigere Drücke erzielen, wird die Durchbiegeausgleichseinrichtung 13 und die Durchbiegeausgleichseinrichtung 9 in Betrieb genommen. Die Durchbiegeausgleichseinrichtung 9 verhindert, daß sich die Unterwalze 5 nach unten durchbiegt, wenn von der Zusatzwalze 12 nicht mehr der notwendige Gegendruck aufgebracht wird.On the other hand, if one wishes to achieve lower pressures, the deflection compensation device 13 and the deflection compensation device 9 are put into operation. The deflection compensation device 9 prevents the lower roller 5 from bending downwards when the additional roller 12 no longer applies the necessary back pressure.

Fig. 3 zeigt die Möglichkeit, die Zusatzwalze 12 auch mit der Oberwalze 4 zusammenwirken zu lassen. In diesem Fall hat die Oberwalze 2 Durchbiegeausgleichseinrichtungen 8, 14, wobei letztere zwar auch von den Zwischenwalzen 6 weg wirkt, aber diesmal nach oben. In gleicher Weise wirkt die Durchbiegeausgleichseinrichtung 13 der Zusatzwalze 12 nach unten, d.h. in Richtung auf die Zwischenwalzen 6 hin.Fig. 3 shows the possibility of having the additional roller 12 also cooperate with the upper roller 4. In this case, the upper roller 2 has deflection compensation devices 8, 14, the latter, although it also acts away from the intermediate rollers 6, but this time upwards. Similarly, the deflection compensation device 13 of the auxiliary roller 12 acts downward, i. in the direction of the intermediate rollers 6 back.

Fig. 4 und 5 zeigen die Lagereinrichtung 10 mit der Unterwalze 5 und der Zusatzwalze 12 mit weiteren Einzelheiten.4 and 5 show the storage device 10 with the lower roller 5 and the additional roller 12 with further details.

Die Lagereinrichtung 10 weist einen Schlitten 18 auf, der am Gestell 2 vertikal verschiebbar angeordnet ist. Zum Antrieb des Schlittens 18 dient der Hydraulikzylinder 11, der in Fig. 4 unter Druck gesetzt und in Fig. 5 entlastet ist.The bearing device 10 has a carriage 18, which is arranged vertically displaceable on the frame 2. To drive the carriage 18 is the hydraulic cylinder 11, which is set in Fig. 4 under pressure and relieved in Fig. 5.

Auf dem Schlitten 18 ist zunächst ein Walzenträger 19 ortsfest angeordnet. Der Walzenträger 19 trägt die Unterwalze 5. Er weist zusätzlich noch einen Walzendrehantrieb 20 auf, der mit der Unterwalze 5 starr verbunden ist.On the carriage 18, a roller support 19 is first arranged stationary. The roller carrier 19 carries the lower roller 5. It additionally has a roller turning drive 20, which is rigidly connected to the lower roller 5.

Auf dem Schlitten 18 ist zusätzlich ein weiterer Hydaulikzylinder 21 vorgesehen, der in Fig. 4 entlastet und in Fig. 5 unter Druck gesetzt ist. Auf dem Kolben dieses Hydraulikzylinders ist ein Träger 22 angeordnet, der die Zusatzwalze 12 axial durchsetzt. Auf dem Träger sind die Elemente der Durchbiegeausgleichseinrichtung 13 abgestützt. Mit Hilfe des Hydraulikzylinders 21 läßt sich der Walzenspalt 15 zwischen der Unterwalze 5 und der Zusatzwalze 12 öffnen oder schließen.On the carriage 18, a further hydraulic cylinder 21 is additionally provided, which is relieved in Fig. 4 and set in Fig. 5 under pressure. On the piston of this hydraulic cylinder, a carrier 22 is arranged, which passes through the additional roller 12 axially. On the support, the elements of the deflection compensation device 13 are supported. With the help of the hydraulic cylinder 21, the nip 15 between the lower roller 5 and the additional roller 12 can be opened or closed.

Der Hydraulikzylinder 21 kann kleiner sein als der Hydraulikzylinder 11, da er lediglich die Zusatzwalze 12 in bezug auf die Unterwalze 5 verlagern muß. Der Hydraulikzylinder 11 muß aber in der Lage sein, die Unterwalze 5 und alle Zwischenwalzen 6 anzuheben.The hydraulic cylinder 21 may be smaller than the hydraulic cylinder 11, since it only has to displace the auxiliary roller 12 with respect to the lower roller 5. However, the hydraulic cylinder 11 must be able to lift the lower roller 5 and all intermediate rollers 6.

Claims (7)

  1. Calender with a roller stack (3), comprising two end rollers (4, 5) and at least one intermediate roller (6, 7), wherein the end rollers (4, 5) in each case comprise a deflection compensating device (8, 9) acting in the direction of the intermediate roller (6, 7), characterised in that at least one end roller (4, 5) comprises an additional deflection compensating device (14) acting in a direction away from the intermediate roller (6) and an additional supplementary roller (12) constructed as a deflection compensating roller is arranged on the side of this end roller (4, 5) facing away from the intermediate roller (6), wherein the additional roller (12) and the associated end roller (4, 5) comprise a common bearing device (10) on the machine frame (2).
  2. Calender according to Claim 1, characterised in that at least one of the rollers (5, 12; 4, 12) is displaceable on the bearing device (10) with respect to the other roller.
  3. Calender according to Claim 2, characterised in that the supplementary roller (12) comprises a carrier (22), which is supported on the bearing device (10) via a hydraulic cylinder (21).
  4. Calender according to one of the Claims 1 to 3, characterised in that at least one of the rollers of the pair of rollers consisting of supplementary roller (12) and end roller (4, 5) has its own rotary drive (20).
  5. Calender according to Claim 4, characterised in that the rotary drive (20) is arranged on the bearing device (10) and is connected to the roller (5) arranged as stationary on the bearing device (10).
  6. Calender according to one of Claims 1 to 5, characterised in that the bearing device (10) is arranged as movable on the machine frame (2).
  7. Calender according to one of Claims 1 to 6, characterised in that one roller of the pair of rollers formed from supplementary roller (12) and end roller (4, 5) has a soft and the other roller a hard surface.
EP97111725A 1996-08-01 1997-07-10 Calander Expired - Lifetime EP0822289B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19631056 1996-08-01
DE19631056A DE19631056C2 (en) 1996-08-01 1996-08-01 calender

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EP0822289A2 EP0822289A2 (en) 1998-02-04
EP0822289A3 EP0822289A3 (en) 1999-02-10
EP0822289B1 EP0822289B1 (en) 2001-11-28
EP0822289B2 true EP0822289B2 (en) 2005-09-21

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DE (2) DE19631056C2 (en)

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DE19832064C2 (en) * 1998-07-16 2000-09-07 Voith Sulzer Papiertech Patent Calender for webs of paper or similar material
DE19832066C2 (en) * 1998-07-16 2000-06-08 Voith Sulzer Papiertech Patent Calender for webs of paper or similar material
FI113071B (en) * 2000-02-21 2004-02-27 Metso Paper Inc Calender
ATE320525T1 (en) * 1999-08-27 2006-04-15 Metso Paper Inc CALENDAR WITH TWO DEFLECTION ADJUSTING INTERMEDIATE ROLLS
DE10206256B4 (en) * 2002-02-15 2006-09-21 Beiersdorf Ag Area calender and surface calendering
DE102004003715B3 (en) 2004-01-24 2005-08-18 Voith Paper Patent Gmbh Method for operating a multi-roll calender and calender
DE102004037237A1 (en) * 2004-07-31 2006-02-16 Voith Paper Patent Gmbh calender
FI117675B (en) * 2004-09-29 2007-01-15 Metso Paper Inc Multiple choice Calendar
FI119154B (en) 2006-12-07 2008-08-15 Metso Paper Inc Multicolor calendars and procedure in a multiple-choice calendar

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Also Published As

Publication number Publication date
EP0822289B1 (en) 2001-11-28
DE59705507D1 (en) 2002-01-10
EP0822289A3 (en) 1999-02-10
US5947017A (en) 1999-09-07
DE19631056C2 (en) 2000-08-17
EP0822289A2 (en) 1998-02-04
DE19631056A1 (en) 1998-02-05

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