EP1285990B1 - Apparatus forming an extended nip - Google Patents
Apparatus forming an extended nip Download PDFInfo
- Publication number
- EP1285990B1 EP1285990B1 EP02017875A EP02017875A EP1285990B1 EP 1285990 B1 EP1285990 B1 EP 1285990B1 EP 02017875 A EP02017875 A EP 02017875A EP 02017875 A EP02017875 A EP 02017875A EP 1285990 B1 EP1285990 B1 EP 1285990B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll
- shoe
- support
- support ring
- mating
- 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
Links
- 230000013011 mating Effects 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 7
- 238000003490 calendering Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000002984 plastic foam Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000012720 thermal barrier coating Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
-
- 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 a device for forming an extended nip between a mating roll and a shoe roll for treating a material web, in particular a paper web, according to the preamble of claim 1.
- Such devices with a shoe having a printing section are known for treating a web, in particular for dewatering and / or calendering a paper web.
- an extended-nip roll press which has a driven counter-roller, which is associated with a fixed support body with a press shoe guided therein.
- the press shoe is hydraulically pressed against the counter roll.
- To the support body is passed around an endless roll shell.
- the press shoe forms with the corresponding roller portion of the backing roll an extended nip through which the fiber web to be dewatered, embedded between webs of material is guided together with the roll shell in the web running direction.
- the press shoe has an upper part which has a slideway along which the roll jacket runs. The slideway is selectable depending on the desired Preßdruckverlaufs on the press nip width and gives the press shoe an effective shoe width.
- the object of the invention is therefore to provide a device for forming an extended nip between a heated backing roll and a shoe roll according to the preamble of claim 1, the roll shell is subject to less wear.
- This provides a device for forming an extended nip between a heated backing roll and a shoe roll in which the roll shell roll is stabilized by direct support of an outer roll shell portion against the backing roll. Roll shell deformations are thereby avoided.
- the roll shell is guided by the support ring in the region between the effective shoe width of the shoe and the end portion attachment, whereby a substantially kinkless transition of the roll shell from the pressure section of the shoe to respective Endabismebefest Trent is ensured.
- the support ring is formed such that it allows a continuous extension of the roll shell outside the print section of the shoe.
- the support ring also causes a thermal insulation, which reduces a thermal stress of the roll shell when using a heated mating roll. The roll shell is thus subject to less thermal wear. The fact that the support ring combines the support function and insulation function in itself, the service life of the roll shell could be significantly increased.
- the support ring may consist of a fiber cement material with high continuous temperature resistance and very good thermal insulation.
- the support ring made of a temperature-resistant plastic or plastic foam. For a self-cooling of the support ring this can also be traversed by air channels.
- the support of the roll shell edge side of the nip preferably takes place by means of a radial thickness of the support ring, which at least on the shoe side has a height which connects to the conditional in the extended nip by the resting on the mating surface web.
- the roll shell then undergoes a support, which adjoins the predetermined position in the extended nip.
- the support ring can not only support the roll shell thermally insulated, but at the same time lead by a radial change in thickness of the support ring to the edge, whereby a determinable Walzenmantelausschung can be determined by the pressure section of the shoe for Endabismebefest Trent. Since the roll mantle is preferably inflated while setting at least a slight overpressure during operation, the roll mantle bears against the support ring of the mating roll and follows its guidance in the transitional region between effective shoe width and end-portion fastening.
- the counter-roller further has, in each case following its counter-surface in each case preferably an annular recess, whereby the web edges receive a freewheel laterally of the print section of the shoe. Further thermal insulation is achieved if this recess has an outer thermal barrier coating.
- the counter-roller preferably has thermally insulated pins on which the support ring can be arranged.
- the counter-roller can be heated by means of oil or inductively and be designed as a hard or soft roller and also as a bending compensating roller.
- the invention relates to a device for forming an extended nip between a backing roll and a shoe roll for treating a web, in particular a paper web, wherein the device may be part of a papermaking plant. Shown and explained below is the left half of a counter roll and a shoe roll of such a device. The right half is formed mirror-symmetrically to the dividing line T, so that the following statements apply to the left half for the right half accordingly.
- the apparatus for forming an extended nip comprises a shoe roll 1 and a driven counter roll 2 which cooperate in an extended nip 3. Through the extended nip 3 at least one web 4 to be treated is performed.
- the shoe roll 1 comprises a fixed support 7 and a roll shell 8 rotatable about the support 7 and made of a flexible material, e.g. Rubber or plastic.
- the roll shell 8 is tubular and secured with its end portions on rotatably seated on the support 7 end walls 9 to form a closed shoe roll 1.
- a space 10 between the carrier 7 and roll shell 8 is preferably supplied with compressed air, whereby the roll shell 8 is inflated to obtain a cylindrical shape.
- a printing section is provided, which is formed by a shoe 11 which limits the extended nip 3 together with the counter-roller 2.
- the shoe 11 is axially spaced via a support strip of a plurality supported hydraulic support members 12 supported on the carrier 7 and can be pressed by this against the roll shell 8 and in the direction of the backing roll 2.
- the shoe 11 has an effective shoe width 13 (see Fig. 2a), on which the roll shell 8 is supported on the shoe 11.
- the effective shoe width 13 is designed as a sliding surface.
- the support elements 12 are connected in a known manner via pressure medium lines 14 to a hydraulic pressure medium, for example oil or water.
- the shoe 11 thus forms with the corresponding shell portion of the backing roll 2, the extended nip 3, through which the at least one web 4 is guided together with the roll shell 8 in a web running direction.
- the counter roll 2 has a roll shell 19, which is heated from the inside or outside to perform the counter roll 2 as a heated roll for temperatures of preferably up to 300 ° C. With its roll neck 20, the counter roll 2 is supported in each pivot bearing 21, 22. An unillustrated drive can engage the counter-roll 2 in a known manner in order to drive it.
- the mating roll can also be designed as a bending compensating roll with a stationary roll core and a roll shell which can be rotated about the roll core and which is supported along its lateral surface via at least one support strip of hydraulic support elements on the roll core.
- the counter roll 2 may finally be formed as a hard or soft roll.
- the counter-roller 2 has a mating surface 24 (cf., FIG. 2 a) on which the at least one material web 4 in the extended nip 3 comes into contact with the counter-roller 2.
- the counter-roller 2 also has at its edge and axially spaced from the mating surface 24 a radially projecting support ring 25, which forms an abutment for the direct support of an outer roll shell section 28 on the counter-roller 2.
- the roll shell 8 is replaced by the support ring 25 in the transition region between effective shoe width 13 and attachment to the end wall 9 along its outer roll shell portion 28 a support.
- the radial thickness of the support ring 25 is selected such that a continuous extension of the roll shell 8 between the shoe 11 and Endabitesbefest Trent is achieved at the end walls 9. This is achieved in that the radial thickness of the support ring 25 adjoins the height that occupies the roll shell 8 in the extended nip 3 due to its positioning on the web 4 and optionally additional material webs.
- the roll shell 8 at the edge of the extended nip 3 can expand continuously radially to the extent predetermined by the end walls 9, since the roll shell 8 is pressed in the extended nip 3.
- the radial thickness of the support ring 25 therefore preferably falls off towards the edge. Since in the inner space 10 of the roll mantle 8 there is preferably an at least slight internal pressure, the roll mantle 8 is pressed against the support ring 25 outside the extended nip 3.
- the support ring 25 is made of a heat-insulating material, which preferably also has a low specific heat and thus is a material with a low heat content.
- the heat-insulating material may be, for example, a high-temperature-resistant fiber cement material or a high-temperature-resistant plastic.
- the support ring 25 thus each forms a heat-resistant heat protection for the outer roll shell sections 28, wherein the thermal insulation function is combined with the guiding function. Local overstressing of the roll shell 8 are thereby avoided, so that there is no longer a need to drive the webs to be treated with excess widths.
- the support ring 25 can sit with the interposition of a thermal insulation of the backing roll 2, to a less temperature-resistant Heat insulation material to use.
- the support ring 25 may further be traversed by a respective air cooling not shown for self-cooling.
- the counter roller 2 in each case axially adjacent to the mating surface 24 has an annular depression 29, which allows an end-side freewheeling of the edges of the material web 4.
- Fig. 2b differs from the Fig. 2a in that with the web 4 a Kalandriermantel 5 is passed through the extended nip 3.
- the calendering jacket 5 may have such elastic properties that are advantageous for smoothing a paper web in an extended nip.
- the extended nip 3 with shoe widths of 25 to 100 mm allows high residence times at high temperatures as a substitute for high compressive stresses, thereby enabling a volume-smoothing, especially in carton. Compressive stresses of, for example, 8 to 12 N / mm 2 here are sufficient for such smoothing.
- the embodiment shown in Fig. 3 differs from the embodiment shown in Fig. 2a in that the counter roller 2 adjacent to the counter surface 24 has a heat-insulating coating 17 in the region of its recess 29.
- the heat-insulating coating 17 may also be integrally formed with the support ring 25, as shown in FIG. 4.
- the above statements apply to the figures 1 and 2a accordingly.
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- Paper (AREA)
- Power Steering Mechanism (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Confectionery (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum Bilden eines Langspalts zwischen einer Gegenwalze und einer Schuhwalze zum Behandeln einer Warenbahn, insbesondere einer Papierbahn, nach dem Oberbegriff des Anspruchs 1.The invention relates to a device for forming an extended nip between a mating roll and a shoe roll for treating a material web, in particular a paper web, according to the preamble of
Derartige Vorrichtungen mit einer eine Druckpartie aufweisenden Schuhwalze sind zum Behandeln einer Warenbahn, insbesondere zum Entwässern und/oder Kalandrieren einer Papierbahn, bekannt.Such devices with a shoe having a printing section are known for treating a web, in particular for dewatering and / or calendering a paper web.
Zum Entwässern einer Papierbahn ist aus der DE 35 03 240 C2 eine Langspalt-Walzenpresse bekannt, die eine angetriebene Gegenwalze aufweist, der ein feststehender Tragkörper mit einem darin geführten Preßschuh zugeordnet ist. Der Preßschuh ist hydraulisch an die Gegenwalze anpreßbar. Um den Tragkörper ist ein endloser Walzenmantel herumgeführt. Der Preßschuh bildet mit dem entsprechenden Walzenabschnitt der Gegenwalze einen verlängerten Preßspalt, durch den die zu entwässernde Faserbahn, eingebettet zwischen Materialbahnen zusammen mit dem Walzenmantel in Bahnlaufrichtung geführt ist. Der Preßschuh weist dazu ein Oberteil auf, das eine Gleitbahn hat, entlang der der Walzenmantel läuft. Die Gleitbahn ist in Abhängigkeit des gewünschten Preßdruckverlaufs über die Preßspaltbreite wählbar und verleiht dem Preßschuh eine wirksame Schuhbreite. Als nachteilig erwiesen hat sich jedoch, daß der Walzenmantel an seinen Bandkanten Verformungen erfährt, die den Verschleiß des Walzenmantels erhöhen.For dewatering a paper web is known from DE 35 03 240 C2, an extended-nip roll press is known, which has a driven counter-roller, which is associated with a fixed support body with a press shoe guided therein. The press shoe is hydraulically pressed against the counter roll. To the support body is passed around an endless roll shell. The press shoe forms with the corresponding roller portion of the backing roll an extended nip through which the fiber web to be dewatered, embedded between webs of material is guided together with the roll shell in the web running direction. For this purpose, the press shoe has an upper part which has a slideway along which the roll jacket runs. The slideway is selectable depending on the desired Preßdruckverlaufs on the press nip width and gives the press shoe an effective shoe width. Has proved to be disadvantageous, however, that the roll shell undergoes deformations at its strip edges, which increase the wear of the roll shell.
Dies gilt insbesondere bei Verwendung der Vorrichtung zum Kalandrieren, wenn die Gegenwalze zusätzlich beheizt ist, wie beispielsweise aus der WO 01/83883 A1 oder EP-A-0619399 bekannt.This applies in particular when using the device for calendering, if the counter-roller is additionally heated, as known, for example, from WO 01/83883 A1 or EP-A-0619399.
Aufgabe der Erfindung ist es daher, eine Vorrichtung zum Bilden eines Langspalts zwischen einer beheizten Gegenwalze und einer Schuhwalze nach dem Oberbegriff des Anspruchs 1 zu schaffen, deren Walzenmantel einem geringeren Verschleiß unterliegt.The object of the invention is therefore to provide a device for forming an extended nip between a heated backing roll and a shoe roll according to the preamble of
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
Hierdurch wird eine Vorrichtung zum Bilden eines Langspalts zwischen einer beheizten Gegenwalze und einer Schuhwalze geschaffen, bei der der Walzenmantellauf durch eine direkte Abstützung eines äußeren Walzenmantelabschnitts an der Gegenwalze stabilisiert wird. Walzenmantelverformungen werden dadurch vermieden. Der Walzenmantel wird durch den Stützring in dem Bereich zwischen der wirksamen Schuhbreite des Schuhs und der Endabschnittbefestigung geführt, wodurch ein im wesentlichen knickfreier Übergang des Walzenmantels von der Druckpartie des Schuhs zur jeweiligen Endabschnittbefestigung sichergestellt wird. Vorzugsweise ist der Stützring derart ausgebildet, daß dieser eine kontinuierliche Erstreckung des Walzenmantels außerhalb der Druckpartie des Schuhs erlaubt. Der Stützring bewirkt zudem eine thermische Isolation, die eine Wärmebeanspruchung des Walzenmantels beim Einsatz einer beheizten Gegenwalze verringert. Der Walzenmantel unterliegt damit auch einem geringeren thermischen Verschleiß. Dadurch, daß der Stützring die Stützfunktion und Isolierfunktion in sich vereinigt, konnten die Standzeiten des Walzenmantels deutlich erhöht werden.This provides a device for forming an extended nip between a heated backing roll and a shoe roll in which the roll shell roll is stabilized by direct support of an outer roll shell portion against the backing roll. Roll shell deformations are thereby avoided. The roll shell is guided by the support ring in the region between the effective shoe width of the shoe and the end portion attachment, whereby a substantially kinkless transition of the roll shell from the pressure section of the shoe to respective Endabschnittbefestigung is ensured. Preferably, the support ring is formed such that it allows a continuous extension of the roll shell outside the print section of the shoe. The support ring also causes a thermal insulation, which reduces a thermal stress of the roll shell when using a heated mating roll. The roll shell is thus subject to less thermal wear. The fact that the support ring combines the support function and insulation function in itself, the service life of the roll shell could be significantly increased.
Der Stützring kann aus einem Faserzement-Werkstoff mit hoher Dauertemperaturbeständigkeit und sehr guter Wärmedämmung bestehen. Alternativ kann der Stützring aus einem temperaturbeständigen Kunststoff oder Kunststoffschaum bestehen. Für eine Eigenkühlung des Stützringes kann dieser ferner von Luftkanälen durchzogen sein.The support ring may consist of a fiber cement material with high continuous temperature resistance and very good thermal insulation. Alternatively, the support ring made of a temperature-resistant plastic or plastic foam. For a self-cooling of the support ring this can also be traversed by air channels.
Die Abstützung des Walzenmantels randseitig der Preßzone erfolgt vorzugsweise mittels einer radialen Dicke des Stützringes, die mindestens schuhseitig eine Höhe aufweist, die an die im Langspalt durch die auf der Gegenfläche aufliegende Warenbahn bedingte Höhe anschließt. Der Walzenmantel erfährt dann eine Abstützung, die an die im Langspalt vorgegebene Positionierung anschließt. Der Stützring kann darüberhinaus den Walzenmantel nicht nur wärmegedämmt abstützen, sondern gleichzeitig auch führen durch eine radiale Dickenänderung des Stützringes zum Rand hin, wodurch eine bestimmbare Walzenmantelauslenkung von der Druckpartie des Schuhs zur Endabschnittbefestigung festgelegt werden kann. Da der Walzenmantel im Betrieb vorzugsweise unter Einstellung eines zumindest geringen Überdrucks aufgeblasen ist, legt sich der Walzenmantel an den Stützring der Gegenwalze an und folgt dessen Führung im Übergangsbereich zwischen wirksamer Schuhbreite und Endabschnittbefestigung.The support of the roll shell edge side of the nip preferably takes place by means of a radial thickness of the support ring, which at least on the shoe side has a height which connects to the conditional in the extended nip by the resting on the mating surface web. The roll shell then undergoes a support, which adjoins the predetermined position in the extended nip. The support ring can not only support the roll shell thermally insulated, but at the same time lead by a radial change in thickness of the support ring to the edge, whereby a determinable Walzenmantelauslenkung can be determined by the pressure section of the shoe for Endabschnittbefestigung. Since the roll mantle is preferably inflated while setting at least a slight overpressure during operation, the roll mantle bears against the support ring of the mating roll and follows its guidance in the transitional region between effective shoe width and end-portion fastening.
Die Gegenwalze weist ferner im Anschluß an ihre Gegenfläche jeweils vorzugsweise eine ringförmige Vertiefung auf, wodurch die Warenbahnränder seitlich der Druckpartie des Schuhs einen Freilauf erhalten. Eine weitere Wärmedämmung wird erreicht, wenn diese Vertiefung eine äußere Wärmedämmschicht aufweist.The counter-roller further has, in each case following its counter-surface in each case preferably an annular recess, whereby the web edges receive a freewheel laterally of the print section of the shoe. Further thermal insulation is achieved if this recess has an outer thermal barrier coating.
Die Gegenwalze weist schließlich vorzugsweise thermisch isolierte Zapfen auf, auf denen der Stützring angeordnet werden kann. Die Gegenwalze kann mittels Öl oder induktiv beheizbar sein und als harte oder weiche Walze und auch als Biegeausgleichswalze ausgeführt sein.Finally, the counter-roller preferably has thermally insulated pins on which the support ring can be arranged. The counter-roller can be heated by means of oil or inductively and be designed as a hard or soft roller and also as a bending compensating roller.
Weitere Ausgestaltungen der Erfindung sind den Unteransprüchen und der nachfolgenden Beschreibung zu entnehmen.Further embodiments of the invention are described in the dependent claims and the following description.
Die Erfindung wird nachstehend anhand der in den beigefügten Abbildungen dargestellten Ausführungsbeispiele näher erläutert.
- Fig. 1 zeigt schematisch im Längsschnitt eine linke Hälfte einer Gegenwalze und einer Schuhwalze einer Vorrichtung zum Bilden eines Langspalts gemäß einem ersten Ausführungsbeispiel,
- Fig. 2a zeigt vergrößert einen Teilbereich des Längsschnitts der Fig. 1 im Bereich des Stützringes,
- Fig. 2b zeigt den Längsschnitt der Fig. 2a mit einem zusätzlichen Kalandriermantel,
- Fig. 3 zeigt schematisch im Längsschnitt einen Teilbereich einer linken Hälfte einer Gegenwalze und einer Schuhwalze einer Vorrichtung zum Bilden eines Langspalts gemäß einem zweiten Ausführungsbeispiel,
- Fig. 4 zeigt schematisch im Längsschnitt einen Teilbereich einer linken Hälfte einer Gegenwalze und einer Schuhwalze einer Vorrichtung zum Bilden eines Langspalts gemäß einem dritten Ausführungsbeispiel,
- 1 shows schematically in longitudinal section a left half of a mating roll and a shoe roll of an apparatus for forming an extended nip according to a first embodiment,
- 2a shows an enlarged portion of the longitudinal section of FIG. 1 in the region of the support ring,
- 2b shows the longitudinal section of FIG. 2a with an additional calendering jacket, FIG.
- 3 shows, in a longitudinal section, a partial region of a left half of a mating roll and a shoe roll of an apparatus for forming an extended nip according to a second exemplary embodiment,
- 4 shows schematically in longitudinal section a partial region of a left half of a mating roll and of a shoe roll of an apparatus for forming an extended nip according to a third exemplary embodiment,
Die Erfindung betrifft eine Vorrichtung zum Bilden eines Langspalts zwischen einer Gegenwalze und einer Schuhwalze zum Behandeln einer Warenbahn, insbesondere einer Papierbahn, wobei die Vorrichtung Teil einer Papierherstellungsanlage sein kann. Dargestellt und nachstehend erläutert ist die linke Hälfte einer Gegenwalze und einer Schuhwalze einer solchen Vorrichtung. Die rechte Hälfte ist spiegelsymmetrisch zur Trennlinie T ausgebildet, so daß die nachstehenden Ausführungen zur linken Hälfte für die rechte Hälfte entsprechend gelten.The invention relates to a device for forming an extended nip between a backing roll and a shoe roll for treating a web, in particular a paper web, wherein the device may be part of a papermaking plant. Shown and explained below is the left half of a counter roll and a shoe roll of such a device. The right half is formed mirror-symmetrically to the dividing line T, so that the following statements apply to the left half for the right half accordingly.
Die Vorrichtung zum Bilden eines Langspalts umfaßt eine Schuhwalze 1 und eine angetriebene Gegenwalze 2, die in einem Langspalt 3 zusammenwirken. Durch den Langspalt 3 ist mindestens eine zu behandelnde Warenbahn 4 geführt.The apparatus for forming an extended nip comprises a
Die Schuhwalze 1 umfaßt einen feststehenden Träger 7 und einen um den Träger 7 drehbaren Walzenmantel 8, der aus einem flexiblen Material, z.B. Gummi oder Kunststoff, besteht. Der Walzenmantel 8 ist schlauchförmig ausgebildet und mit seinen Endabschnitten an drehbar auf dem Träger 7 sitzenden Stirnwänden 9 befestigt, um eine geschlossene Schuhwalze 1 zu bilden. Einem Zwischenraum 10 zwischen Träger 7 und Walzenmantel 8 wird vorzugsweise Druckluft zugeführt, wodurch der Walzenmantel 8 aufgeblasen wird, um eine zylindrische Form zu erhalten.The
An dem Träger 7 ist eine Druckpartie vorgesehen, die von einem Schuh 11 gebildet wird, der zusammen mit der Gegenwalze 2 den Langspalt 3 begrenzt. Der Schuh 11 ist über eine Stützleiste aus einer Mehrzahl axial beabstandet zueinander angeordneter hydraulischer Stützelemente 12 am Träger 7 abgestützt und ist von dieser gegen den Walzenmantel 8 und in Richtung der Gegenwalze 2 drückbar. Der Schuh 11 weist eine wirksame Schuhbreite 13 (vgl. Fig. 2a) auf, auf der der Walzenmantel 8 sich an dem Schuh 11 abstützt. Die wirksame Schuhbreite 13 ist dazu als Gleitfläche ausgebildet. Die Stützelemente 12 sind in bekannter Weise über Druckmittelleitungen 14 an ein hydraulisches Druckmittel, z.B. Öl oder Wasser, angeschlossen.On the
Der Schuh 11 bildet somit mit dem entsprechenden Mantelabschnitt der Gegenwalze 2 den Langspalt 3, durch den die mindestens eine Warenbahn 4 zusammen mit dem Walzenmantel 8 in einer Bahnlaufrichtung geführt ist.The
Die Gegenwalze 2 besitzt einen Walzenmantel 19, der von innen oder außen beheizbar ist, um die Gegenwalze 2 als beheizte Walze für Temperaturen von vorzugsweise bis zu 300°C auszuführen. Mit ihren Walzenzapfen 20 ist die Gegenwalze 2 jeweils in Drehlagern 21, 22 abgestützt. Ein nicht dargestellter Antrieb kann in bekannter Weise an der Gegenwalze 2 angreifen, um diese anzutreiben. Die Gegenwalze kann auch als Biegeausgleichswalze mit einem feststehenden Walzenkern und einem um den Walzenkern drehbaren Walzenmantel, der längs seiner Mantelfläche über mindestens eine Stützleiste hydraulischer Stützelemente am Walzenkern abgestützt ist, ausgebildet sein. Die Gegenwalze 2 kann schließlich als harte oder weiche Walze ausgebildet sein.The
Die Gegenwalze 2 weist eine Gegenfläche 24 (vgl. Fig. 2a) auf, auf der die mindestens eine Materialbahn 4 im Langspalt 3 in Auflage mit der Gegenwalze 2 gelangt. Die Gegenwalze 2 weist ferner jeweils randseitig und axial beabstandet zur Gegenfläche 24 einen radial vorspringenden Stützring 25 auf, der ein Gegenlager zur direkten Abstützung eines äußeren Walzenmantelabschnitts 28 an der Gegenwalze 2 bildet.The
Der Walzenmantel 8 erhält durch den Stützring 25 in dem Übergangsbereich zwischen wirksamer Schuhbreite 13 und Befestigung an der Stirnwand 9 entlang seines äußeren Walzenmantelabschnitts 28 eine Abstützung. Die radiale Dicke des Stützringes 25 ist derart gewählt, daß eine kontinuierliche Erstreckung des Walzenmantels 8 zwischen Schuh 11 und Endabschnittbefestigung an den Stirnwänden 9 erreicht wird. Dies wird dadurch erreicht, daß die radiale Dicke des Stützringes 25 an die Höhe anschließt, die der Walzenmantel 8 im Langspalt 3 einnimmt aufgrund seiner Positionierung auf der Warenbahn 4 und gegebenenfalls zusätzlicher Materialbahnen. Hierdurch kann der Walzenmantel 8 randseitig des Langspaltes 3 sich kontinuierlich auf das von den Stirnwänden 9 vorgegebene Maß radial ausdehnen, da der Walzenmantel 8 im Langspalt 3 eingedrückt wird. Die radiale Dicke des Stützringes 25 fällt deshalb vorzugsweise zum Rand hin ab. Da in dem Innenraum 10 des Walzenmantels 8 vorzugsweise ein zumindest geringfügiger Innendruck herrscht, wird der Walzenmantel 8 außerhalb des Langspalts 3 gegen den Stützring 25 gedrückt.The
Der Stützring 25 besteht aus einem wärmedämmenden Material, das vorzugsweise zudem eine niedrige spezifische Wärme besitzt und dadurch dann ein Material mit einem geringen Wärmeinhalt ist. Bei dem wärmedämmenden Material kann es sich beispielsweise um einen hochtemperaturbeständigen Faserzement-Werkstoff oder einen hochtemperaturbeständigen Kunststoff handeln. Der Stützring 25 bildet damit jeweils einen hitzebeständigen Wärmeschutz für die äußeren Walzenmantelabschnitte 28, wobei die thermische Isolierfunktion mit der Führungsfunktion kombiniert ist. Örtliche Überbeanspruchungen des Walzenmantels 8 werden dadurch vermieden, so daß keine Notwendigkeit mehr besteht, die zu behandelnden Warenbahnen mit Überbreiten zu fahren.The
Der Stützring 25 kann unter Zwischenschaltung einer thermischen Isolierung der Gegenwalze 2 sitzen, um auch ein weniger temperaturbeständiges Wärmeschutzmaterial einsetzen zu können. Der Stützring 25 kann ferner für eine Eigenkühlung jeweils von nicht dargestellten Luftkanälen durchzogen sein.The
Wie Fig. 2a zeigt, weist die Gegenwalze 2 jeweils axial benachbart zu der Gegenfläche 24 eine ringförmige Vertiefung 29 auf, die einen endseitigen Freilauf der Ränder der Warenbahn 4 erlaubt.As shown in FIG. 2 a, the
Fig. 2b unterscheidet sich von der Fig. 2a dadurch, daß mit der Warenbahn 4 ein Kalandriermantel 5 durch den Langspalt 3 geführt wird. Der Kalandriermantel 5 kann solche elastischen Eigenschaften aufweisen, die für ein Glätten einer Papierbahn in einem Langspalt vorteilhaft sind. Der Langspalt 3 bei Schuhbreiten von 25 bis 100 mm ermöglicht hohe Verweilzeiten bei hohen Temperaturen als Ersatz für hohe Druckspannungen, wodurch ein volumenschonendes Glätten, insbesondere bei Karton, ermöglicht wird. Druckspannungen von beispielsweise hier 8 bis 12 N/mm2 sind für ein solches Glätten hinreichend.Fig. 2b differs from the Fig. 2a in that with the web 4 a Kalandriermantel 5 is passed through the extended
Das in Fig. 3 dargestellte Ausführungsbeispiel unterscheidet sich von dem in Fig. 2a dargestellten Ausführungsbeispiel dadurch, daß die Gegenwalze 2 im Bereich ihrer Vertiefung 29 benachbart der Gegenfläche 24 eine wärmedämmende Beschichtung 17 aufweist. Die wärmedämmende Beschichtung 17 kann zudem einstückig mit dem Stützring 25 ausgebildet sein, wie dies Fig. 4 zeigt. Im übrigen gelten die vorstehenden Ausführungen zu den Figuren 1 und 2a entsprechend.The embodiment shown in Fig. 3 differs from the embodiment shown in Fig. 2a in that the
Claims (15)
- Apparatus for forming an extended nip (3) between a heated mating roll (2) and a shoe roll (1) for treating a product web (4), especially a paper web, the shoe roll (1) having a stationary support (7) and a flexible belt (8) which can rotate about the support (7) and, in the area of the extended nip (3), is supported on a shoe (11) which is guided on the support (7), forms a press section and has an effective shoe width (13), and the belt (8) having end sections which are fixed to end walls (9) that are rotatably mounted on the support (7), characterized in that in each case at the ends and axially adjacent to but at a distance from a mating face (24) located opposite the effective shoe width (13) of the shoe (11), the mating roll (2) has a radially protruding support ring (25), which forms an opposing bearing for the direct support of an outer belt section (28) on the mating roll (2) and consists of a thermally insulating material.
- Apparatus according to claim 1, characterized in that the support ring (25) consists of a fibrous cement material.
- Apparatus according to claim 1, characterized in that the supporting ring (25) consists of a high-temperature-resistant plastic.
- Apparatus according to one of claims 1 to 3, characterized in that the support ring (25) in each case has a radial thickness which permits a continuous extent of the belt (8) in the area between shoe (11) and end fixing.
- Apparatus according to one of claims 1 to 4, characterized in that the support ring (25) in each case has a radial thickness which, at least on the shoe side lies in the range of a height formed by a product web (4) on the mating roll (2).
- Apparatus according to one of claims 1 to 5, characterized in that the support ring (25) has a radial thickness which decreases towards the edge.
- Apparatus according to one of claims 1 to 6, characterized in that the support ring (25) is in each case arranged axially at a distance from the effective shoe width (13) of the shoe (11) such that a free-running section for a product web (4) remains at the end.
- Apparatus according to claim 7, characterized in that in the area of the free-running section, the mating roll (2) has an annular depression (29) for the ends of a product web (4) to hang over freely.
- Apparatus according to claim 8, characterized in that the depression (29) has an outer thermal protection layer (17).
- Apparatus according to claim 9, characterized in that the thermal protection layer (17) is formed in one piece with the support ring (25).
- Apparatus according to one of claims 1 to 10, characterized in that for calendering a product web (4), a calendering belt (5) can be guided through the extended nip (3) with the product web (4).
- Apparatus according to one of claims 1 to 11, characterized in that the support ring (25) is seated on the mating roll (2) over a thermal insulation layer.
- Apparatus according to one of claims 1 to 12, characterized in that the supporting ring (25) is in each case penetrated by air ducts for dedicated cooling.
- Apparatus according to one of claims 1 to 13, characterized in that the mating roll (2) is designed as a heated, internally hydraulically supported roll.
- Apparatus according to one of claims 1 to 14, characterized in that the thermally insulating material is one with a low enthalpy.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE20121221U | 2001-08-14 | ||
DE20121221U DE20121221U1 (en) | 2001-08-14 | 2001-08-14 | Long nip roller press for dewatering a fibrous web |
DE10207371 | 2002-02-22 | ||
DE10207371A DE10207371B4 (en) | 2001-08-14 | 2002-02-22 | Device for forming an elongated gap |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1285990A1 EP1285990A1 (en) | 2003-02-26 |
EP1285990B1 true EP1285990B1 (en) | 2006-10-11 |
Family
ID=26011031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02017875A Expired - Lifetime EP1285990B1 (en) | 2001-08-14 | 2002-08-09 | Apparatus forming an extended nip |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1285990B1 (en) |
AT (1) | ATE342398T1 (en) |
DE (2) | DE20220685U1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10329198B4 (en) * | 2003-06-28 | 2006-08-03 | Voith Paper Patent Gmbh | Extended nip calender |
DE102004023565A1 (en) * | 2004-05-13 | 2005-12-08 | Voith Paper Patent Gmbh | press roll |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI96046C (en) * | 1993-03-24 | 1996-04-25 | Valmet Paper Machinery Inc | Opening procedure for a pinch in a long pinch press and plant for opening a pinch in a long pinch press |
FI20000927A0 (en) * | 2000-04-18 | 2000-04-18 | Valmet Corp | Procedure for calendering a cardboard web |
-
2002
- 2002-02-22 DE DE20220685U patent/DE20220685U1/en not_active Expired - Lifetime
- 2002-08-09 EP EP02017875A patent/EP1285990B1/en not_active Expired - Lifetime
- 2002-08-09 DE DE50208391T patent/DE50208391D1/en not_active Expired - Lifetime
- 2002-08-09 AT AT02017875T patent/ATE342398T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE342398T1 (en) | 2006-11-15 |
DE50208391D1 (en) | 2006-11-23 |
DE20220685U1 (en) | 2003-12-24 |
EP1285990A1 (en) | 2003-02-26 |
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