EP1431453B1 - Extended nip calender - Google Patents
Extended nip calender Download PDFInfo
- Publication number
- EP1431453B1 EP1431453B1 EP03027126A EP03027126A EP1431453B1 EP 1431453 B1 EP1431453 B1 EP 1431453B1 EP 03027126 A EP03027126 A EP 03027126A EP 03027126 A EP03027126 A EP 03027126A EP 1431453 B1 EP1431453 B1 EP 1431453B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shell
- cylindrical shape
- deformed
- deformation
- jacket
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 230000004323 axial length Effects 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/006—Calenders; Smoothing apparatus with extended nips
Definitions
- the invention relates to a wide-nip calender with a non-stressed state at least partially having a cylindrical shape, circumferential mantle, a mating roll and a pressure shoe that presses the mantle to form a wide nip against the mating roll and thereby deformed out of the cylindrical shape.
- Such a broad-nip calender is for example off DE 299 02 451 U1 known.
- Flat-nip calenders serve to satinize a fibrous web, for example a paper or board web, ie to apply increased pressure and, as a rule, also an elevated temperature.
- the wide-nip calender has a longer treatment length. This treatment length is formed by the fact that the jacket rests on a part of the peripheral surface of the counter roll on the counter roll. This concern is caused by the pressure shoe, which presses the jacket against the counter roll.
- the jacket has in the "resting state", that is, when it is unloaded, over most of its axial length a cylindrical shape. Seen from the outside, it is therefore convexly curved over the entire circumference.
- the jacket In the area where the jacket is pressed by the pressure shoe against the counter roll, the jacket is deformed concave. In addition, the jacket is often deformed by the pressure shoe also radially outward. This produces at the axial ends of the shell conically extending sections, in which one avoids that the jacket comes into contact with the hot counter-roller. Such contact would thermally overstress and thus damage the jacket, which is typically formed from a plastic material.
- US Pat. No. 6,164,198 shows a wide-nip calender with a unloaded state at least partially having a cylindrical shape, circumferential mantle, a backing roll and a pressure shoe that presses the shell to form a wide nip against the counter roll and thereby deformed out of the cylinder shape.
- DE 196 42 943 A1 shows a pressing device for the treatment of a paper web having a shoe press roller, the pressure shoe is tapered in the axial direction to its two ends and / or in its lateral edge regions has a flattening outwards and / or to the axis of rotation out contour. As a result, the jacket is slightly bulged outside of the broad nip, so deformed out of the cylindrical shape.
- the invention has for its object to provide a flat-nip calender, in which the coat is as little as possible.
- the jacket is still deformed as before. But it holds the deformation within limits, in which the total load of the shell is as small as possible.
- the jacket is deformed outwardly only over part of its circumference radially beyond the cylindrical shape which it occupies in the unloaded state. In another part, it is even deformed radially inwards relative to the cylinder shape in the unloaded state.
- a maximum deformation corresponds radially outwards to a maximum deformation radially inward.
- the maximum deformation is the largest distance the jacket has from the cylindrical shape. This largest distance is the same radially outward as radially inward. This achieves a deformation equilibrium in which the load on the rotating jacket is relatively low.
- an outer differential volume formed between the cylindrical shape and the deformed shell radially outward of the cylindrical shape corresponds to an inner differential volume formed between the cylindrical shape and the deformed shell radially inside the cylinder shape.
- the outer and inner difference volumes are only theoretical quantities, because the jacket can not simultaneously have a cylindrical shape and a deformed shape during operation.
- the cylindrical shape can be reconstructed by calculation without further ado.
- the arrangement of the pressure shoe against the counter-roller and other elements that influence the shape of the shell, for example, support disks at the axial ends of the shell so can be the outer differential volume and the inner differential volume to match each other. However, an exact match is not required.
- the jacket is closed at its end faces in each case with a side plate whose radius is smaller than a radius of the deformed shell in the region of the maximum deformation radially outward. This is in the areas where the jacket is deformed radially outward, ie in the direction of rotation of the shell at the beginning and at the end of the pressure shoe, ensured that the jacket is pulled away from the counter roll.
- a certain deformation of the shell is also observed in the axial direction. However, this deformation is limited due to the sizing of the side windows.
- the side window has a radius that is at least as large as a radius of the deformed shell in the region of the maximum deformation radially inward.
- the coat is indeed no longer pulled away from the roller. For this one keeps the deformation of the shell small. Since the contact time of the shell with the counter roll is only short, a touch may even be allowed.
- Fig. 1 shows schematically a wide-nip calender 1 in the neckline with a circumferential jacket 2, which is pressed under the action of a pressure shoe 3 against a counter-roller 4.
- the pressure shoe 3 has a pressing surface 5, which is adapted to the curvature of the counter-roller 4.
- a different shape is also possible in principle.
- means are usually provided to effect a lubrication between the pressure shoe 3 and the jacket 2, when the jacket 2 is passed under pressure between the pressure shoe 3 and the counter-roller 4.
- Such means may for example be outlet openings of a hydrostatic lubrication.
- the shell 2 has a cylindrical shape in the unloaded state, which is represented in the present case by a circular line 6. It is not necessary that the jacket 2 assumes this cylindrical shape over the entire axial length.
- conical sections may be provided at the axial ends.
- the shell 2 is deformed out of the cylinder shape.
- the deformation is now controlled so that the shell 2 is partially deformed by the circular line 6 radially outward and partially radially inward.
- the jacket 2 Since the jacket 2 has a certain thickness, the following explanations are made on the basis of a center line 8 of the jacket 2, which is shown in dot-dash line in the jacket 2.
- the pressure shoe 3 has in the circumferential direction at its two ends rounded projections 9, 10, while having a recess 11 in the region of its center.
- the projections 9, 10 and the recess 11 merge into one another, for example along a cylinder jacket surface.
- the jacket 2 is deformed outward with respect to the circular line 6. This results in a maximum deformation 12 in the region of the "tip" of the projection 9 (a corresponding deformation also results at the tip of the projection 10).
- a deformation radially inward results in the region of the recess 11 and here in the middle. Again, there is a maximum deformation 13th
- Fig. 1 illustrates the deformation of the shell in the circumferential direction. This deformation results practically only in the area where the pressure shoe 3 is arranged, ie in a partial region of the axial length of the shell second
- a further deformation results at the axial ends of the shell 2, as shown in Fig. 2.
- the jacket 2 is shown with solid lines in the region of its maximum deformation radially outwards and with dashed lines in the region of its maximum deformation radially inwards.
- the jacket 2 is closed at its axial ends with side windows 14.
- These side windows 14 have a radius which is smaller than a radius of the deformed shell 2 in the area of the maximum deformation 12 radially outwards, but is as large as a radius of the deformed shell 2 in the area of the maximum deformation 13 radially inwards. In this way it is achieved that the deformation in the axial edge region can also be kept within certain limits.
Landscapes
- Paper (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Prostheses (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
Description
Die Erfindung betrifft einen Breitnip-Kalander mit einem im unbelasteten Zustand zumindest abschnittsweise eine Zylinderform aufweisenden, umlaufenden Mantel, einer Gegenwalze und einem Anpreßschuh, der den Mantel zur Bildung eines Breitnips an die Gegenwalze drückt und dabei aus der Zylinderform heraus verformt.The invention relates to a wide-nip calender with a non-stressed state at least partially having a cylindrical shape, circumferential mantle, a mating roll and a pressure shoe that presses the mantle to form a wide nip against the mating roll and thereby deformed out of the cylindrical shape.
Ein derartiger Breitnip-Kalander ist beispielsweise aus
Breitnip-Kalander dienen dazu, eine Faserstoffbahn, beispielsweise eine Papier- oder Kartonbahn, zu satinieren, also mit erhöhtem Druck und in der Regel auch mit einer erhöhten Temperatur zu beaufschlagen. Im Gegensatz zu Kalandern, die mit zwei gegeneinander wirkenden Walzen arbeiten, hat der Breitnip-Kalander eine größere Behandlungslänge. Diese Behandlungslänge wird dadurch gebildet, daß der Mantel über einen Teil der Umfangsfläche der Gegenwalze an der Gegenwalze anliegt. Dieses Anliegen wird durch den Anpreßschuh bewirkt, der den Mantel an die Gegenwalze drückt. Der Mantel hat im "Ruhezustand", also dann, wenn er unbelastet ist, über den größten Teil seiner axialen Länge eine zylindrische Form. Von außen gesehen ist er also über den gesamten Umfang konvex gekrümmt. In dem Bereich, wo der Mantel durch den Anpreßschuh gegen die Gegenwalze gedrückt wird, wird der Mantel konkav verformt. Hinzu kommt, daß der Mantel durch den Anpreßschuh vielfach auch radial nach außen verformt wird. Damit erzeugt man an den axialen Enden des Mantels konisch verlaufende Abschnitte, in denen man vermeidet, daß der Mantel mit der heißen Gegenwalze in Kontakt kommt. Eine derartige Berührung würde den Mantel, der in der Regel aus einem Kunststoffmaterial gebildet ist, thermisch überbeanspruchen und damit schädigen.Flat-nip calenders serve to satinize a fibrous web, for example a paper or board web, ie to apply increased pressure and, as a rule, also an elevated temperature. In contrast to calenders, which work with two opposing rollers, the wide-nip calender has a longer treatment length. This treatment length is formed by the fact that the jacket rests on a part of the peripheral surface of the counter roll on the counter roll. This concern is caused by the pressure shoe, which presses the jacket against the counter roll. The jacket has in the "resting state", that is, when it is unloaded, over most of its axial length a cylindrical shape. Seen from the outside, it is therefore convexly curved over the entire circumference. In the area where the jacket is pressed by the pressure shoe against the counter roll, the jacket is deformed concave. In addition, the jacket is often deformed by the pressure shoe also radially outward. This produces at the axial ends of the shell conically extending sections, in which one avoids that the jacket comes into contact with the hot counter-roller. Such contact would thermally overstress and thus damage the jacket, which is typically formed from a plastic material.
Die geschilderte Verformung führt allerdings zu einer teilweise erheblichen Beanspruchung des Mantels. Diese Beanspruchung, die durch eine permanente Umformung des Mantels im Betrieb hervorgerufen wird, führt dazu, daß die Lebensdauer eines derartigen Mantels begrenzt ist. Der Breitnip-Kalander muß also von Zeit zu Zeit stillgesetzt werden, um den Mantel zu erneuern. Dies erhöht den Anteil der Stillstandszeiten an der Betriebszeit.However, the described deformation leads to a partially considerable stress on the jacket. This stress, which is caused by a permanent deformation of the shell in operation, causes the life of such a shell is limited. The wide-nip calender must therefore be shut down from time to time to renew the coat. This increases the proportion of downtime in the operating time.
Der Erfindung liegt die Aufgabe zugrunde, einen Breitnip-Kalander anzugeben, bei dem der Mantel möglichst wenig belastet wird.The invention has for its object to provide a flat-nip calender, in which the coat is as little as possible.
Diese Aufgabe wird bei einem Breitnip-Kalander der eingangs genannten Art dadurch gelöst, daß der Mantel im an die Gegenwalze gedrückten Zustand im Bereich des Breitnips von der Zylinderform ausgehend teilweise radial nach außen und teilweise radial nach innen verformt ist.This object is achieved in a broad-nip calender of the type mentioned above in that the jacket is deformed in the pressed state to the counter-roller in the region of the broad nip of the cylinder shape starting partially radially outward and partially radially inwardly.
Mit dieser Ausgestaltung wird der Mantel zwar nach wie vor verformt. Man hält aber die Verformung in Grenzen, bei denen die Gesamtbelastung des Mantels möglichst klein ist. Der Mantel wird nur über einen Teil seines Umfangs radial über die Zylinderform, die er im unbelasteten Zustand einnimmt, hinaus nach außen verformt. In einem anderen Teil wird er sogar radial nach innen verformt gegenüber der Zylinderform im unbelasteten Zustand. Man kann insgesamt davon ausgehen, daß die Druck- und Zugbelastungen dann so gleichmäßig verteilt sind, daß die Belastung insgesamt relativ gering bleibt. Die Belastung läßt sich allerdings nicht vollkommen beseitigen. Wenn davon die Rede ist, daß der Mantel an der Gegenwalze anliegt, dann ist dies im Betrieb natürlich so zu verstehen, daß er unter Zwischenlage einer Bahn an der Gegenwalze anliegt. Ein direkter Kontakt zwischen dem Mantel und der Gegenwalze soll nach wie vor möglichst vermieden werden.With this embodiment, the jacket is still deformed as before. But it holds the deformation within limits, in which the total load of the shell is as small as possible. The jacket is deformed outwardly only over part of its circumference radially beyond the cylindrical shape which it occupies in the unloaded state. In another part, it is even deformed radially inwards relative to the cylinder shape in the unloaded state. One can assume overall that the Compressive and tensile loads are then distributed so evenly that the total load remains relatively low. However, the burden can not be completely eliminated. If it is mentioned that the jacket rests against the counter roll, then this is of course to be understood in the operation so that it rests with the interposition of a web on the counter roll. Direct contact between the jacket and the counter roll should still be avoided as far as possible.
Vorzugsweise entspricht eine Maximalverformung radial nach außen einer Maximalverformung radial nach innen. Die Maximalverformung ist der größte Abstand, den der Mantel von der Zylinderform hat. Dieser größte Abstand ist radial nach außen genauso groß, wie radial nach innen. Damit erreicht man ein Verformungsgleichgewicht, bei dem die Belastung des umlaufenden Mantels relativ gering ist.Preferably, a maximum deformation corresponds radially outwards to a maximum deformation radially inward. The maximum deformation is the largest distance the jacket has from the cylindrical shape. This largest distance is the same radially outward as radially inward. This achieves a deformation equilibrium in which the load on the rotating jacket is relatively low.
Mit Vorteil entspricht in einem Pressenabschnitt ein äußeres Differenzvolumen, das zwischen der Zylinderform und dem verformten Mantel radial außerhalb der Zylinderform gebildet ist, einem inneren Differenzvolumen, das zwischen der Zylinderform und dem verformten Mantel radial innerhalb der Zylinderform gebildet ist. Das äußere und das innere Differenzvolumen sind natürlich nur theoretische Größen, weil der Mantel im Betrieb nicht gleichzeitig eine Zylinderform und eine verformte Form aufweisen kann. Die Zylinderform läßt sich jedoch rechnerisch ohne weiteres nachbilden. Durch die Anordnung des Anpreßschuhs gegenüber der Gegenwalze und weiterer Elemente, die die Form des Mantels beeinflussen, beispielsweise Stützscheiben an den axialen Enden des Mantels, lassen sich also das äußere Differenzvolumen und das innere Differenzvolumen aneinander angleichen. Eine exakte Übereinstimmung ist allerdings nicht erforderlich. Auch dies ist eine Maßnahme, die gut geeignet ist, ein Verformungsgleichgewicht herzustellen und damit die Belastung des Mantels klein zu halten. Wenn man das Ganze in einer Schnittansicht betrachtet, dann ist der Flächeninhalt zwischen einer Kreislinie, die die Zylinderform nachbildet, und dem Mäntel radial außerhalb der Kreislinie gleich einer entsprechenden Fläche radial innerhalb der Kreislinie.Advantageously, in a press section, an outer differential volume formed between the cylindrical shape and the deformed shell radially outward of the cylindrical shape corresponds to an inner differential volume formed between the cylindrical shape and the deformed shell radially inside the cylinder shape. Of course, the outer and inner difference volumes are only theoretical quantities, because the jacket can not simultaneously have a cylindrical shape and a deformed shape during operation. However, the cylindrical shape can be reconstructed by calculation without further ado. The arrangement of the pressure shoe against the counter-roller and other elements that influence the shape of the shell, for example, support disks at the axial ends of the shell, so can be the outer differential volume and the inner differential volume to match each other. However, an exact match is not required. Again, this is a measure that is well suited to produce a deformation equilibrium and thus to keep the burden of the shell small. When viewed in a sectional view, the area between a circular line that mimics the cylindrical shape and the cladding radially outside the circular line is equal to a corresponding area radially inward of the circular line.
Vorzugsweise ist der Mantel an seinen Stirnseiten jeweils mit einer Seitenscheibe abgeschlossen, deren Radius kleiner als ein Radius des verformten Mantels im Bereich der Maximalverformung radial nach außen ist. Damit wird in den Bereichen, wo der Mantel radial nach außen verformt wird, also in Umlaufrichtung des Mantels am Anfang und am Ende des Anpreßschuhs, dafür gesorgt, daß der Mantel von der Gegenwalze weg gezogen wird. Hier ist zwar eine gewisse Verformung des Mantels auch in axialer Richtung zu beobachten. Diese Verformung ist jedoch aufgrund der Bemessung der Seitenscheiben begrenzt.Preferably, the jacket is closed at its end faces in each case with a side plate whose radius is smaller than a radius of the deformed shell in the region of the maximum deformation radially outward. This is in the areas where the jacket is deformed radially outward, ie in the direction of rotation of the shell at the beginning and at the end of the pressure shoe, ensured that the jacket is pulled away from the counter roll. Here, although a certain deformation of the shell is also observed in the axial direction. However, this deformation is limited due to the sizing of the side windows.
Vorzugsweise weist die Seitenscheibe einen Radius auf, der mindestens so groß ist wie ein Radius des verformten Mantels im Bereich der Maximalverformung radial nach innen. In diesem Bereich wird der Mantel zwar nicht mehr von der Walze weg gezogen. Dafür hält man die Verformung des Mantels klein. Da die Kontaktzeit des Mantels mit der Gegenwalze nur kurz ist, ist eine Berührung unter Umständen sogar erlaubt.Preferably, the side window has a radius that is at least as large as a radius of the deformed shell in the region of the maximum deformation radially inward. In this area, the coat is indeed no longer pulled away from the roller. For this one keeps the deformation of the shell small. Since the contact time of the shell with the counter roll is only short, a touch may even be allowed.
Die Erfindung wird im folgenden anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit der Zeichnung näher beschrieben. Hierin zeigen:
- Fig. 1
- einen schematischen Querschnitt durch einen Teil eines Breitnip-Kalanders und
- Fig. 2
- einen schematischen Längsschnitt.
- Fig. 1
- a schematic cross-section through part of a Breitnip calender and
- Fig. 2
- a schematic longitudinal section.
Fig. 1 zeigt schematisch einen Breitnip-Kalander 1 im Ausschnitt mit einem umlaufenden Mantel 2, der unter der Wirkung eines Anpreßschuhs 3 gegen eine Gegenwalze 4 gedrückt wird. Der Anpreßschuh 3 weist dabei eine Preßfläche 5 auf, die der Krümmung der Gegenwalze 4 angepaßt ist. Eine andere Ausformung ist jedoch prinzipiell auch möglich.Fig. 1 shows schematically a wide-nip calender 1 in the neckline with a
In der Preßfläche 5 sind üblicherweise Mittel vorgesehen, um eine Schmierung zwischen dem Anpreßschuh 3 und dem Mantel 2 zu bewirken, wenn der Mantel 2 unter Druck zwischen dem Anpreßschuh 3 und der Gegenwalze 4 hindurchgeführt wird. Derartige Mittel können beispielsweise Austrittsöffnungen einer hydrostatischen Schmierung sein.In the
Der Mantel 2 weist im unbelasteten Zustand eine Zylinderform auf, die im vorliegenden Fall durch eine Kreislinie 6 dargestellt ist. Es ist nicht erforderlich, daß der Mantel 2 diese Zylinderform über die gesamte axiale Länge einnimmt. An den axialen Enden können beispielsweise konische Abschnitte vorgesehen sein.The
Wenn der Mantel 2 jedoch gegen die Gegenwalze 4 gedrückt wird, um einen Breitnip 7 zu bilden, dann wird der Mantel 2 aus der Zylinderform heraus verformt. Die Verformung wird nun so gesteuert, daß der Mantel 2 teilweise von der Kreislinie 6 radial nach außen und teilweise radial nach innen verformt wird.However, when the
Da der Mantel 2 eine gewisse Dicke aufweist, werden die folgenden Erläuterungen anhand einer Mittellinie 8 des Mantels 2 vorgenommen, die strichpunktiert in den Mantel 2 eingezeichnet ist.Since the
Der Anpreßschuh 3 weist in Umlaufrichtung an seinen beiden Enden abgerundete Vorsprünge 9, 10 auf, während er im Bereich seiner Mitte eine Vertiefung 11 aufweist. Natürlich gehen die Vorsprünge 9, 10 und die Vertiefung 11 ineinander über, beispielsweise entlang einer Zylindermantelfläche. Im Bereich der Vorsprünge 9, 10 wird der Mantel 2 gegenüber der Kreislinie 6 nach außen verformt. Dabei entsteht eine maximale Verformung 12 im Bereich der "Spitze" des Vorsprungs 9 (eine entsprechende Verformung ergibt sich auch an der Spitze des Vorsprungs 10). Eine Verformung radial nach innen ergibt sich im Bereich der Vertiefung 11 und zwar hier in der.Mitte. Auch hier ergibt sich eine maximale Verformung 13.The
Man kann nun durch eine entsprechende Dimensionierung des Anpreßschuhs 3 und der Teile, die den Mantel 2 positionieren, dafür sorgen, daß die Maximalverformung 12 radial nach außen der Maximalverformung 13 radial nach innen entspricht. Damit wird ein Verformungsgleichgewicht zwischen der Verformung radial nach außen und der Verformung radial nach innen erreicht. Die Gesamtbelastung des Mantels 2 durch die Verformung in Umlaufrichtung bleibt relativ klein.It can now be ensured by an appropriate dimensioning of the
Man kann auch dafür sorgen, daß ein Differenzvolumen, das sich radial außerhalb der Kreislinie zwischen der Kreislinie 6 und dem Mantel 2, genauer gesagt der Mittellinie 8 des Mantels 2, bildet, etwa genauso groß ist, wie ein entsprechendes Differenzvolumen, das sich im Bereich der Vertiefung 11 radial innerhalb der Kreislinie bildet. Bezogen auf die Querschnittsansicht der Fig. 1 könnte man auch sagen; daß die Flächeninhalte zwischen der Mittellinie 8 und der Kreislinie 6 radial außerhalb der Kreislinie 6 etwa genauso groß sind, wie radial innerhalb der Kreislinie 6. Diese Relation kann sich allerdings auf den eigentlichen Pressenbereich des Mantels 2 beschränken. Am übrigen Umfang des Mantels 2, also außerhalb einer Schnittlinie der Kreislinie 6 mit der Mittellinie 8, ist es nicht mehr von entscheidender Bedeutung, ob der Mantel 2 im Betrieb tatsächlich wieder eine Zylinderform annimmt oder nicht. Die Verformungen des Mantels 2 in diesem Bereich spielen nur eine untergeordnete Rolle.It is also possible to ensure that a difference volume which forms radially outside the circular line between the
Fig. 1 stellt die Verformung des Mantels in Umlaufrichtung dar. Diese Verformung ergibt sich praktisch nur in dem Bereich, wo der Anpreßschuh 3 angeordnet ist, also in einem Teilbereich der axialen Länge des Mantels 2.Fig. 1 illustrates the deformation of the shell in the circumferential direction. This deformation results practically only in the area where the
Eine weitere Verformung ergibt sich an den axialen Enden des Mantels 2, wie dies in Fig. 2 dargestellt ist. Der Mantel 2 ist mit durchgezogenen Linien im Bereich seiner Maximalverformung radial nach außen dargestellt und mit gestrichelten Linien im Bereich seiner Maximalverformung radial nach innen.A further deformation results at the axial ends of the
Der Mantel 2 ist an seinen axialen Enden mit Seitenscheiben 14 abgeschlossen. Diese Seitenscheiben 14 haben einen Radius, der kleiner ist als ein Radius des verformten Mantels 2 im Bereich der Maximalverformung 12 radial nach außen, aber so groß ist wie ein Radius des verformten Mantels 2 im Bereich der Maximalverformung 13 radial nach innen. Auf diese Weise erreicht man, daß die Verformung im axialen Randbereich ebenfalls in gewissen Grenzen gehalten werden kann.The
Claims (5)
- Extended nip calender (1) having a revolving shell (2) which, in the unloaded state, has a cylindrical shape (6), at least in some sections, an opposing roll (4) and a pressure shoe (3), which presses the shell (2) against the opposing roll (4) in order to form an extended nip (7) and, in the process, deforms it out of the cylindrical shape (6), characterized in that, when pressed against the opposing roll (4), the shell (2) in the region of the extended nip (7) is deformed partially radially outwards and partially radially inwards, starting from the cylindrical shape (6).
- Calender according to Claim 1, characterized in that a maximum deformation (12) radially outwards corresponds to a maximum deformation (13) radially inwards.
- Calender according to Claim 1 or 2, characterized in that, in a pressing section, an outer differential volume which is formed between the cylindrical shape (6) and the deformed shell (2) radially outside the cylindrical shape (6) corresponds to an inner differential volume which is formed between the cylindrical shape (6) and the deformed shell (2) radially inside the cylindrical shape (6).
- Calender according to one of Claims 1 to 3, characterized in that the shell (2) is terminated at its ends by a side disc (14) in each case, of which the radius is smaller than a radius of the deformed shell (2) in the region of the maximum deformation (12) radially outwards.
- Calender according to Claim 4, characterized in that the side disc (14) has a radius which is at least as large as a radius of the deformed shell (2) in the region of the maximum deformation (13) radially inwards.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10259442A DE10259442C5 (en) | 2002-12-19 | 2002-12-19 | Extended nip calender |
| DE10259442 | 2002-12-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1431453A1 EP1431453A1 (en) | 2004-06-23 |
| EP1431453B1 true EP1431453B1 (en) | 2007-10-03 |
Family
ID=32336464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03027126A Expired - Lifetime EP1431453B1 (en) | 2002-12-19 | 2003-11-26 | Extended nip calender |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1431453B1 (en) |
| AT (1) | ATE374863T1 (en) |
| DE (2) | DE10259442C5 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004030008A1 (en) * | 2004-06-22 | 2006-01-12 | Voith Paper Patent Gmbh | Wide nip calender and method of calendering a web |
| DE102004048156A1 (en) * | 2004-10-02 | 2006-04-06 | Voith Paper Patent Gmbh | Pressing device in a press section of a machine for producing a fibrous web |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3239954C2 (en) * | 1982-10-28 | 1984-10-18 | J.M. Voith Gmbh, 7920 Heidenheim | Roller press for webs of paper, textiles or the like. |
| DE3317457A1 (en) * | 1983-05-13 | 1984-11-15 | J.M. Voith Gmbh, 7920 Heidenheim | Pressing device for material in strip form, in particular for dewatering a web of paper |
| DE3338487A1 (en) * | 1983-10-22 | 1985-05-02 | Sulzer-Escher Wyss GmbH, 7980 Ravensburg | Press roll |
| DE3503373A1 (en) * | 1985-02-01 | 1986-08-07 | J.M. Voith Gmbh, 7920 Heidenheim | ROLL PRESS WITH A LONG GAP PRESS ROLL |
| DE19615654A1 (en) * | 1996-04-19 | 1997-10-23 | Voith Sulzer Papiermasch Gmbh | Pressure shoe for flexible pressure cylinder for paper manufacture |
| DE19642943A1 (en) * | 1996-10-17 | 1998-04-23 | Voith Sulzer Papiermasch Gmbh | Paper-making press section |
| SE9804346D0 (en) * | 1998-12-16 | 1998-12-16 | Valmet Corp | Method and apparatus for calendering paper |
| US20030032059A1 (en) * | 2000-05-23 | 2003-02-13 | Zhen-Gang Wang | Gene recombination and hybrid protein development |
| US6505549B2 (en) * | 2000-11-20 | 2003-01-14 | Metso Paper Karlstad Ab | Method of and an apparatus for protecting the jacket upon a web break in a hot shoe press roll nip |
| FI116734B (en) * | 2001-10-25 | 2006-02-15 | Metso Paper Inc | A method for treating a paper or board web and a paper or board web handling device |
-
2002
- 2002-12-19 DE DE10259442A patent/DE10259442C5/en not_active Expired - Fee Related
-
2003
- 2003-11-26 DE DE50308315T patent/DE50308315D1/en not_active Expired - Lifetime
- 2003-11-26 EP EP03027126A patent/EP1431453B1/en not_active Expired - Lifetime
- 2003-11-26 AT AT03027126T patent/ATE374863T1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| EP1431453A1 (en) | 2004-06-23 |
| DE10259442B4 (en) | 2006-05-24 |
| DE10259442A1 (en) | 2004-07-15 |
| DE10259442C5 (en) | 2008-01-03 |
| DE50308315D1 (en) | 2007-11-15 |
| ATE374863T1 (en) | 2007-10-15 |
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