EP1348804B1 - Tissue papermaking machine with a shoe press - Google Patents

Tissue papermaking machine with a shoe press Download PDF

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Publication number
EP1348804B1
EP1348804B1 EP03100295A EP03100295A EP1348804B1 EP 1348804 B1 EP1348804 B1 EP 1348804B1 EP 03100295 A EP03100295 A EP 03100295A EP 03100295 A EP03100295 A EP 03100295A EP 1348804 B1 EP1348804 B1 EP 1348804B1
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EP
European Patent Office
Prior art keywords
machine
producing
tissue web
web according
shoe
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EP03100295A
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German (de)
French (fr)
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EP1348804A1 (en
Inventor
Thomas Thoröe Scherb
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Voith Patent GmbH
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Voith Paper Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • 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
    • D21F3/0227—Belts or sleeves therefor

Definitions

  • the invention relates to a machine for producing a tissue web with a shoe press unit having a press shoe, wherein the press shoe can be pressed against the jacket of a drying cylinder via a plurality of pressing elements to form a press nip, through which the tissue web to be formed or treated can be passed and wherein the plurality of pressing elements are arranged transversely to the web running direction.
  • the usual press shoes have a width across the width transverse to the web direction constant thickness.
  • the press nip does not run straight across the width, but has to adapt to the contour of the jacket of the Yankee cylinder in order, for example, to maintain constant dry content values over the width Tissuebahn to reach.
  • the contour of a Yankee cylinder changes due to the vapor pressure inside as well as due to a thermal expansion of the end caps. If a press shoe is then pressed against the Yankee cylinder to form a press nip or press nip, the pressure pressure profile in the gap is no longer constant in the transverse direction, but deviates upwards or downwards at the edges. The press shoe must therefore be bent over the width seen.
  • the press shoe is relatively thin and thus compared to a Sauganpresswalze has a relatively small bending moment of inertia, it opposes a respective bending moment too much resistance.
  • the pressing pressure acting on the tissue web edges is greater than in the middle of the web.
  • an attempt has already been made to reduce the thickness of the press shoe uniformly across the width in order to achieve a smaller bending moment of inertia or moment of resistance.
  • this measure does not result in production-related reasons to the desired result.
  • the problem could not be completely solved because the contact forces of adjacent contact elements and correspondingly the residual errors were too large.
  • Shoe presses are known from DE 32 39 954, DE 196 42 943 and US Pat. No. 4,428,797, in which the press shoe is made thinner at its lateral edge regions than in the middle region of the press shoe. But the thinner edge areas are all outside the press nip.
  • a shoe press is further known, the press shoe is formed within the press nip in its two lateral edge regions thinner than in the central region.
  • a camber is to be achieved by the training, by which it is possible to press the press shoe by means of only one extending over the entire width of the press shoe pressing element generating a transverse to the web running direction pressing force against the counter roll in the shoe press.
  • the shoe press unit has a press shoe which can be pressed against a drying cylinder by a plurality of pressing elements.
  • the aim of Erfingung is to provide a tissue machine of the type mentioned, with which the aforementioned problems are eliminated.
  • a basic idea of the invention is thus to reduce the flexural rigidity in the edge region of the shoe, and to be able to set a desired pressing pressure profile by means of the pressing elements which can be controlled separately at least in the edge region.
  • the lower bending stiffness in question can be achieved, for example, in that the press shoe has a smaller thickness in the edge regions than in its intermediate region and / or the material of the press shoe is selected accordingly.
  • the press shoe thickness is reduced only in the peripheral areas.
  • a respective edge region of lower flexural rigidity has a width measured transversely to the machine direction of at most about 1000 mm, in particular of at most about 700 mm and preferably of at most about 500 mm.
  • the width of a respective edge region may, for example, extend over two pressing elements, preferably over three pressing elements and in particular over four pressing elements.
  • the thickness in a respective edge region towards the relevant shoe edge it is advantageous if the thickness becomes increasingly smaller in a respective edge region towards the relevant shoe edge.
  • the thickness in a respective edge region towards the relevant shoe edge for example, gradually become smaller.
  • the transition between the individual stages can in particular be continuous. In principle, however, such an embodiment is conceivable in which the thickness in a respective edge region to the relevant shoe edge is continuously or steadily smaller.
  • the press shoe has a plurality of local material recesses in a respective edge region. These may in particular be formed by cuts or the like, which may extend at least partially, in particular in the transverse direction or in the web running direction.
  • the material recesses may for example have an equal size.
  • the material recesses can be formed by cuts of constant depth.
  • the material recesses can also be formed by cuts of variable depth.
  • the incisions extend at least partially in the transverse direction and the incisions each have a depth to the respective shoe edge increasing.
  • the material recesses may also have at least partially a different size.
  • they may be formed, for example, by cuts of different depths.
  • the depth of transverse cuts extending to the relevant shoe edge become greater.
  • the material recesses formed for example by cuts can be arranged at the same distance or at different distances from each other. In the latter case, the material recesses may for example be arranged closer to the relevant shoe edge.
  • a corresponding reduction in thickness is provided only on the side of the press shoe facing away from the press nip.
  • a thickness reduction is provided both on the side facing away from the press nip side and on the side of the press shoe facing the press nip.
  • a thickness reduction which is continuous with the relevant shoe edge can also be provided in a respective edge region.
  • a stepped reduction in thickness it is also conceivable, for example, a stepped reduction in thickness.
  • the thickness reduction provided in a respective edge region is selected such that the bending stiffness of the press shoe decreases toward the relevant shoe edge.
  • the press shoe can be made in one or more parts.
  • the press shoe may in particular also consist of different materials.
  • the press shoe in the edge regions, for example, at least partially made of a flexurally softer material than in the central region.
  • Figure 1 shows a schematic longitudinal sectional view of a drying cylinder 10, in particular Yankee cylinder, with associated conventional press shoe 12 comprehensive shoe press 14 in the unloaded state.
  • the jacket 16 of the drying cylinder 10 is thus not bent in the present case.
  • the press shoe 12 is pressed against the drying cylinder 10 by at least one row of pressing elements 18.
  • the press shoe 12 forms with the drying cylinder 10 the press nip 20, through which the tissue web is guided together with at least one carrier tape (not shown).
  • the tissue web preferably runs together with a water-impermeable press jacket and a felt (water-absorbent) through this press nip or nip 20.
  • Figure 2 shows a comparable to that of Figure 1 representation of the shoe press 14 in the loaded state, i. in the operating state.
  • the contour of the drying cylinder 10 deformed by the in-cylinder pressure (steam) and a greater expansion of the front cover of the drying cylinder due to the steam temperature and by other design-related factors.
  • the contour of the drying or Yankee cylinder 10, in particular in the region of the press nip 20, is influenced by different pressing pressures or line forces.
  • the jacket 16 of the drying cylinder 22 is here so bent. As can be seen with reference to FIG. 2, a corresponding deflection also results in the press shoe 12.
  • the conventional press shoe 12 shown in FIGS. 1 and 2 has a thickness which is constant over the width.
  • FIG. 3 shows a schematic longitudinal section of a shoe press 21 according to the invention with a drying cylinder 22, in particular a Yankee cylinder, and a press shoe 24 according to the invention with associated pressing elements 26 arranged in at least one row extending transversely to the web running direction and over which the press shoe 24 is pressed against the drying cylinder 22.
  • the press shoe 24 can be made in one or more parts be.
  • the shoe press 22 is shown in the operating state.
  • the press shoe 24 forms with the drying cylinder 22 the press nip 28, through which the tissue web is guided together with at least one carrier tape (not shown).
  • the tissue web again runs along with a water-impervious press cover and a felt (water-absorbent) through this press nip or nip 28.
  • the jacket 30 of the drying cylinder 22 is bent in the illustrated operating state. As can be seen from FIG. 3, a corresponding deflection also results again for the press shoe 24.
  • the two lateral edge regions R of the press shoe 24 each have a plurality of, for example, three pressing elements 26 1 - 26 3 assigned.
  • the middle region can be assigned pressing elements 26 z (cf., FIGS. 4 and 6).
  • press shoe 24 has, in its two lateral edge regions R adjacent to the web edges, at least in sections a smaller thickness d than in its intermediate region M located therebetween.
  • an at least substantially continuous thickness reduction 34 can also be provided in a respective edge region R.
  • This thickness reduction 34 is also in the present case e.g. again provided on the side facing away from the press nip 28 side of the press shoe 24.
  • the transition from the middle region M into the thickness-reduced edge region R can, for example, run continuously.
  • At least the two edge regions R of the press shoe 24 associated pressing members 26 are at least partially controlled separately.
  • the particular hydraulic pressure elements 26 i - 26 3 can thus be applied in particular with different pressures, whereby correspondingly different contact forces are generated.
  • the pressing elements can be controlled so that in the press nip 28 results in an at least substantially uniform compression cross-pressure profile or line force profile.
  • a respective edge region R of lesser thickness d may, for example, have a width measured transversely to the machine direction of at most about 1000 mm, in particular of at most about 700 mm and preferably of at most about 500 mm.
  • Figure 4 shows a schematic partial view of a further embodiment of the press shoe 24 according to the invention, in which again only on the side facing away from the press nip side a corresponding reduction in thickness 34 is provided.
  • the thickness in a respective edge region R becomes gradually smaller towards the relevant shoe edge R '. It can take place between the individual stages 34 ', as shown, for example, a continuous transition.
  • a respective correspondingly reduced thickness edge region R are again assigned separately controllable pressing elements 26 1 , 26 2 .
  • two such pressing elements 26 1 , 26 2 are assigned to a respective edge region R, for example.
  • the middle region M of the press shoe is acted upon by pressing elements 26 z , which can also be at least partially separately controlled again.
  • FIG. 5 shows a schematic end view of the press shoe 24 according to FIG. 4.
  • FIG. 6 shows, in a schematic partial representation, a further embodiment of the press shoe 24 according to the invention, in which again a respective reduction in thickness 34 is again provided only on the side facing away from the press nip.
  • a plurality of incisions 32 extending here, for example in the web running direction, are provided in a respective edge region R.
  • the edge regions R are each again assigned at least partially separately controllable pressing elements 26 1 - 26 3 .
  • the central region is again acted upon by corresponding pressing elements 26 z .
  • FIG. 7 shows, in a schematic partial representation, a further embodiment of the press shoe 24 according to the invention, but in this case the corresponding reduction in thickness 34 on the press nip facing side of the press shoe 24 is provided.
  • the thickness d of the press shoe 24 becomes increasingly smaller in a respective edge region R for the relevant shoe edge R '.
  • edge regions R are again assigned separately controllable pressing elements (not shown).
  • FIG. 8 shows, in a schematic partial representation, a further embodiment of the press shoe 24 according to the invention, in which, however, the respective thickness reduction 34 in the edge regions R is again provided on the side of the press shoe 24 facing away from the press nip. In this case, transversely extending incisions 34 are provided, the depth of which increases towards the respective shoe edge R '.
  • FIG. 9 shows a schematic end view of a part of the press shoe 24 according to FIG. 8 in the direction of the arrow "A" of FIG. 8.
  • FIG. 10 shows, in a schematic partial representation, a further embodiment of the press shoe 24 according to the invention, in which case the press shoe 24 consists of different materials. It is possible, for example, that the press shoe 24 in the edge region R consists partly or entirely of a material that is more flexible than in the middle region M.
  • press shoe 24 may consist, for example, of a first material 36, eg brass or the like, and a carrier material 38, eg fiber-reinforced plastic or the like.
  • the carrier material in the edge region R is reduced in thickness.

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Abstract

A tissue paper making machine has a de-watering press shoe (24) which is applied to a drying cylinder (22) forming a nip interface (28). The press shoe has a centre-zone (M) between two outer margins (R) which are esp. more flexible than the centre zone. Also claimed is a tissue paper making machine with a series of pressure jacks (26) applied to the shoe (24) lower surface. The shoe is progressively thinner (d) towards the outer margins (R) than in the centre section (M). The width of the outer margin is pref. 500 mm and is supported by pref. four pressure jacks (26).

Description

Die Erfindung betrifft eine Maschine zur Herstellung einer Tissuebahn mit einer einen Presschuh aufweisenden Schuhpresseinheit, wobei der Pressschuh über mehrere Anpresselemente gegen den Mantel eines Trockenzylinders unter Bildung eines Pressspalts pressbar ist, durch den die zu bildende oder zu behandelnde Tissuebahn hindurchführbar ist und wobei die mehreren Anpresselemente quer zur Bahnlaufrichtung angeordnet sind.The invention relates to a machine for producing a tissue web with a shoe press unit having a press shoe, wherein the press shoe can be pressed against the jacket of a drying cylinder via a plurality of pressing elements to form a press nip, through which the tissue web to be formed or treated can be passed and wherein the plurality of pressing elements are arranged transversely to the web running direction.

Die bisher üblichen Pressschuhe besitzen eine über die Breite quer zur Bahnlaufrichtung konstante Dicke.The usual press shoes have a width across the width transverse to the web direction constant thickness.

Insbesondere bei Tissue-Maschinen mit so genannten Yankee-Trockenzylindern tritt nun aber das Problem auf, dass der Pressspalt über die Breite nicht gerade verläuft, sondern sich der Kontur des Mantels des Yankee-Zylinders anpassen muss, um über die Breite beispielsweise konstante Trockengehaltswerte für die Tissuebahn zu erreichen. Die Kontur eines Yankee-Zylinders verändert sich infolge des Dampfdruckes im Innern sowie infolge einer Temperaturausdehnung der Stirndeckel. Wird nun ein Pressschuh zur Bildung eines Pressspaltes oder Pressnips gegen den Yankee-Zylinder gepresst, so ist der sich im Spalt ergebende Pressdruckverlauf in Querrichtung nicht mehr konstant, sondern weicht an den Rändern nach oben oder unten ab. Der Pressschuh muss also über die Breite gesehen gebogen werden. Obwohl der Pressschuh relativ dünn ist und somit im Vergleich zu einer Sauganpresswalze ein relativ kleines Biegeträgheitsmoment aufweist, setzt er einem jeweiligen Biegemoment einen zu großen Widerstand entgegen. Dies hat zur Folge, dass der auf die Tissuebahnränder wirkende Pressdruck größer wid als in der Bahnmitte. Um diesem Problem zu begegnen, wurde bereits versucht, die Dicke des Pressschuhes gleichmäßig über die Breite zu reduzieren, um ein kleineres Biegeträgheitsmoment bzw. Widerstandsmoment zu erzielen. Diese Maßnahme führt jedoch aus fertigungstechnischen Gründen nicht zum gewünschten Ergebnis. Auch durch eine unterschiedliche Anpressung am Randbereich konnte das Problem nicht vollständig gelöst werden, da die Anpresskräfte benachbarter Anpresselemente und entsprechend die Restfehler zu groß waren.However, in particular in the case of tissue machines with so-called Yankee drying cylinders, the problem now arises that the press nip does not run straight across the width, but has to adapt to the contour of the jacket of the Yankee cylinder in order, for example, to maintain constant dry content values over the width Tissuebahn to reach. The contour of a Yankee cylinder changes due to the vapor pressure inside as well as due to a thermal expansion of the end caps. If a press shoe is then pressed against the Yankee cylinder to form a press nip or press nip, the pressure pressure profile in the gap is no longer constant in the transverse direction, but deviates upwards or downwards at the edges. The press shoe must therefore be bent over the width seen. Although the press shoe is relatively thin and thus compared to a Sauganpresswalze has a relatively small bending moment of inertia, it opposes a respective bending moment too much resistance. As a result, the pressing pressure acting on the tissue web edges is greater than in the middle of the web. To counter this problem, an attempt has already been made to reduce the thickness of the press shoe uniformly across the width in order to achieve a smaller bending moment of inertia or moment of resistance. However, this measure does not result in production-related reasons to the desired result. Also by a different contact pressure At the edge area, the problem could not be completely solved because the contact forces of adjacent contact elements and correspondingly the residual errors were too large.

Aus den DE 32 39 954, DE 196 42 943 und US 4,428,797 sind Schuhpressen bekannt, bei denen der Pressschuh an seinen seitlichen Randbereichen dünner als im Mittenbereich des Pressschuhs ausgebildet ist. Die dünneren Randbereiche liegen aber allesamt außerhalb des Pressspalts.Shoe presses are known from DE 32 39 954, DE 196 42 943 and US Pat. No. 4,428,797, in which the press shoe is made thinner at its lateral edge regions than in the middle region of the press shoe. But the thinner edge areas are all outside the press nip.

Aus der DE 196 42 049 ist des weiteren eine Schuhpresse bekannt, deren Pressschuh innerhalb des Pressspalts in seinen beiden seitlichen Randbereichen dünner als im Mittenbereich ausgebildet ist. Gemäß dieser Druckschrift soll durch die Ausbildung eine Bombage erreicht werden, durch die es möglich ist den Pressschuh mittels nur einem sich über die gesamte Breite des Pressschuhs erstreckenden Anpresselements unter Erzeugung einer quer zur Bahnlaufrichtung gleichen Presskraft gegen die Gegenwalze in der Schuhpresse anzupressen.From DE 196 42 049 a shoe press is further known, the press shoe is formed within the press nip in its two lateral edge regions thinner than in the central region. According to this document, a camber is to be achieved by the training, by which it is possible to press the press shoe by means of only one extending over the entire width of the press shoe pressing element generating a transverse to the web running direction pressing force against the counter roll in the shoe press.

Aus der DE 100 32 251 ist eine Maschine zur Herstellung von Tissuepapier mit einer Schupresseinheit bekannt. Die Schuhpresseinheit weißt einen durch mehrere Anpresselemente gegen einen Trockenzylinder anpressbaren Pressschuh auf.From DE 100 32 251 a machine for the production of tissue paper with a Schupresseinheit is known. The shoe press unit has a press shoe which can be pressed against a drying cylinder by a plurality of pressing elements.

Ziel der Erfingung ist es, eine Tissue-Maschine der eingangs genannten Art zu schaffen, mit denen die zuvor genannten Probleme beseitigt sind.The aim of Erfingung is to provide a tissue machine of the type mentioned, with which the aforementioned problems are eliminated.

Diese Aufgabe wird bei einer Tissuemaschine der eingangs genannten Art dadurch gelöst, dass der Pressschuh innerhalb des Pressspalts in seinen beiden seitlichen, den Bahnrändern benachbarten Randbereichen zumindest abschnittweise eine geringere Biegesteifigkeit besitzt als in seinem dazwischen liegenden mittleren Bereich und dass zumindest die den beiden Randbereichen zugeordneten Anpresselemente wenigstens teilweise getrennt ansteuerbar sind.This object is achieved in a tissue machine of the type mentioned in that the press shoe within the press nip in its two lateral edge regions adjacent edge portions at least partially has a lower flexural rigidity than in its intermediate middle region and that at least the two edge regions associated pressing elements at least partially separately controllable.

Ein Grundgedanke der Erfindung besteht also darin, die Biegesteifigkeit im Randbereich des Schuhes zu reduzieren, und mittels der zumindest im Randbereich getrennt ansteuerbaren Anpresselemente einen gewünschten Pressdruckverlauf einstellen zu können.A basic idea of the invention is thus to reduce the flexural rigidity in the edge region of the shoe, and to be able to set a desired pressing pressure profile by means of the pressing elements which can be controlled separately at least in the edge region.

Dabei kann die betreffende geringere Biegesteifigkeit beispielsweise dadurch erreicht werden, dass der Pressschuh in den Randbereichen eine geringere Dicke besitzt als in seinem dazwischen liegenden Bereich und/oder das Material des Pressschuhs entsprechend gewählt wird.In this case, the lower bending stiffness in question can be achieved, for example, in that the press shoe has a smaller thickness in the edge regions than in its intermediate region and / or the material of the press shoe is selected accordingly.

Im Fall einer Dickenreduzierung wird die Pressschuhdicke also beispielsweise nur in den Randbereichen reduziert.In the case of a reduction in thickness, for example, the press shoe thickness is reduced only in the peripheral areas.

Gemäß einer bevorzugten praktischen Ausführungsform des erfindungsgemäßen Pressschuhs besitzt ein jeweiliger Randbereich geringerer Biegesteifigkeit eine quer zur Maschinenlaufrichtung gemessene Breite von höchstens etwa 1000 mm, insbesondere von höchstens etwa 700 mm und vorzugsweise von höchstens etwa 500 mm. Die Breite eines jeweiligen Randbereichs kann sich beispielsweise über zwei Anpresselemente, vorzugsweise über drei Anpresselemente und insbesondere über vier Anpresselemente erstrecken.According to a preferred practical embodiment of the press shoe according to the invention, a respective edge region of lower flexural rigidity has a width measured transversely to the machine direction of at most about 1000 mm, in particular of at most about 700 mm and preferably of at most about 500 mm. The width of a respective edge region may, for example, extend over two pressing elements, preferably over three pressing elements and in particular over four pressing elements.

In bestimmten Fällen ist es von Vorteil, wenn die Dicke in einem jeweiligen Randbereich zum betreffenden Schuhrand hin zunehmend kleiner wird. Dabei kann die Dicke in einem jeweiligen Randbereich zum betreffenden Schuhrand hin beispielsweise stufenweise kleiner werden. Der Übergang zwischen den einzelnen Stufen kann insbesondere kontinuierlich erfolgen. Grundsätzlich ist jedoch auch eine solche Ausführungsform denkbar, bei der die Dicke in einem jeweiligen Randbereich zum betreffenden Schuhrand hin kontinuierlich oder stetig kleiner wird.In certain cases, it is advantageous if the thickness becomes increasingly smaller in a respective edge region towards the relevant shoe edge. In this case, the thickness in a respective edge region towards the relevant shoe edge, for example, gradually become smaller. The transition between the individual stages can in particular be continuous. In principle, however, such an embodiment is conceivable in which the thickness in a respective edge region to the relevant shoe edge is continuously or steadily smaller.

Bei einer zweckmäßigen praktischen Ausführungsform weist der Pressschuh in einem jeweiligen Randbereich eine Mehrzahl von lokalen Materialaussparungen auf. Diese können insbesondere durch Einschnitte oder dergleichen gebildet sein, die sich zumindest teilweise insbesondere in Querrichtung oder in Bahnlaufrichtung erstrecken können.In an expedient practical embodiment, the press shoe has a plurality of local material recesses in a respective edge region. These may in particular be formed by cuts or the like, which may extend at least partially, in particular in the transverse direction or in the web running direction.

Die Materialaussparungen können beispielsweise eine gleiche Größe besitzen. So können die Materialaussparungen beispielsweise durch Einsschnitte konstanter Tiefe gebildet sein.The material recesses may for example have an equal size. For example, the material recesses can be formed by cuts of constant depth.

Grundsätzlich können die Materialaussparungen jedoch auch durch Einschnitte variabler Tiefe gebildet sein. So ist beispielsweise eine solche Ausführungsform denkbar, bei der sich die Einschnitte zumindest teilweise in Querrichtung erstrecken und die Einschnitte jeweils eine zum betreffenden Schuhrand hin zunehmende Tiefe besitzen.In principle, however, the material recesses can also be formed by cuts of variable depth. Such is, for example Embodiment conceivable in which the incisions extend at least partially in the transverse direction and the incisions each have a depth to the respective shoe edge increasing.

Die Materialaussparungen können aber auch zumindest teilweise eine unterschiedliche Größe besitzen. In diesem Fall können sie beispielsweise durch Einschnitte unterschiedlicher Tiefe gebildet sein. So kann z.B. die Tiefe von sich in Querrichtung erstreckenden Einschnitten zum betreffenden Schuhrand hin größer werden.The material recesses may also have at least partially a different size. In this case, they may be formed, for example, by cuts of different depths. Thus, e.g. the depth of transverse cuts extending to the relevant shoe edge become greater.

Die beispielsweise durch Einschnitte gebildeten Materialaussparungen können in einem gleichen Abstand oder auch in unterschiedlichem Abstand voneinander angeordnet sein. Im letzteren Fall können die Materialaussparungen beispielsweise zum betreffenden Schuhrand hin dichter angeordnet sein.The material recesses formed for example by cuts can be arranged at the same distance or at different distances from each other. In the latter case, the material recesses may for example be arranged closer to the relevant shoe edge.

Gemäß einer bevorzugten praktischen Ausführungsform des erfindungsgemäßen Pressschuhs ist nur auf der vom Pressspalt abgewandten Seite des Pressschuhes eine entsprechende Dickenreduzierung vorgesehene.According to a preferred practical embodiment of the press shoe according to the invention, a corresponding reduction in thickness is provided only on the side of the press shoe facing away from the press nip.

In bestimmten Fällen kann es jedoch auch von Vorteil sein, wenn sowohl auf der vom Pressspalt abgewandten Seite als auch auf der dem Pressspalt zugewandten Seite des Pressschuhes jeweils eine Dickenreduzierung vorgesehen ist.In certain cases, however, it may also be advantageous if in each case a thickness reduction is provided both on the side facing away from the press nip side and on the side of the press shoe facing the press nip.

Grundsätzlich ist jedoch auch eine solche Ausführung denkbar, bei der nur auf der dem Pressspalt zugewandten Seite des Pressschuhes eine entsprechende Dickenreduzierung vorgesehen ist.In principle, however, such a design is conceivable in which a corresponding reduction in thickness is provided only on the press nip facing side of the press shoe.

Wie bereits erwähnt, kann in einem jeweiligen Randbereich insbesondere auch eine zum betreffenden Schuhrand hin stetige Dickenreduzierung vorgesehen sein. Es ist jedoch beispielsweise auch eine gestufte Dickenreduzierung denkbar.As already mentioned, in particular, a thickness reduction which is continuous with the relevant shoe edge can also be provided in a respective edge region. However, it is also conceivable, for example, a stepped reduction in thickness.

Vorzugsweise ist die in einem jeweiligen Randbereich vorgesehene Dickenreduzierung so gewählt, dass die Biegesteifigkeit des Pressschuhes zum betreffenden Schuhrand hin abnimmt.Preferably, the thickness reduction provided in a respective edge region is selected such that the bending stiffness of the press shoe decreases toward the relevant shoe edge.

Der Pressschuh kann einteilig oder auch mehrteilig ausgeführt sein.The press shoe can be made in one or more parts.

Alternativ oder zusätzlich kann der Pressschuh insbesondere auch aus unterschiedlichen Materialien bestehen. Gemäß einer zweckmäßigen praktischen Ausführungsform kann der Pressschuh in den Randbereichen beispielsweise zumindest teilweise aus einem biegeweicheren Material bestehen als im mittleren Bereich.Alternatively or additionally, the press shoe may in particular also consist of different materials. According to an expedient practical embodiment of the press shoe in the edge regions, for example, at least partially made of a flexurally softer material than in the central region.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnungen näher erläutert; in dieser zeigen:

Figur 1
eine schematische Längsschnittdarstellung einer einen Yankee-Zylinder mit zugeordnetem herkömmlichen Pressschuh umfassenden Schuhpresse im nicht belasteten Zustand,
Figur 2
eine schematische Längsschnittdarstellung der einen Yankee-Zylinder mit zugeordnetem herkömmlichen Pressschuh umfassenden Schuhpresse im Betriebszustand (Dampfdruck, Temperatur, Pressdruck),
Figur 3
eine schematische Längsschnittdarstellung einer erfindungsgemäßen Schuhpresse im Betriebszustand mit einem Yankee-Zylinder und einem diesem zugeordneten erfindungsgemäßen Pressschuh,
Figur 4
eine schematische Teildarstellung einer weiteren Ausführungsform des erfindungsgemäßen Pressschuhes, wobei nur auf der vom Pressspalt abgewandten Seite des Pressschuhes eine entsprechende Dickenreduzierung vorgesehen ist und die Dicke in einem jeweiligen Randbereich zum betreffenden Schuhrand hin stufenweise kleiner wird,
Figur 5
eine schematische Stirnansicht des Pressschuhes gemäß Figur 4,
Figur 6
eine schematische Teildarstellung einer weiteren Ausführungsform des erfindungsgemäßen Pressschuhes, wobei in einem jeweiligen Randbereich des Pressschuhes auf der vom Pressspalt abgewandten Seite eine Mehrzahl von sich in Bahnlaufrichtung erstreckenden Einschnitten vorgesehen ist,
Figur 7
eine schematische Teildarstellung einer weiteren Ausführungsform des erfindungsgemäßen Pressschuhes, wobei in einem jeweiligen Randbereich des Pressschuhes auf der dem Pressspalt zugewandten Seite eine zum jeweiligen Schuhrand hin stetige Dickenreduzierung vorgesehen ist,
Figur 8
eine schematische Teildarstellung einer weiteren Ausführungsform des erfindungsgemäßen Pressschuhes, wobei in einem jeweiligen Randbereich des Pressschuhes auf der vom Pressspalt abgewandten Seite sich in Querrichtung erstreckende Einschnitte vorgesehene sind, deren Tiefe zum jeweiligen Schuhrand hin zunimmt,
Figur 9
eine schematische Stirnansicht des Pressschuhes gemäß Figur 8 in Richtung des Pfeils "A" der Figur 8 und
Figur 10
eine schematische Teildarstellung einer weiteren Ausführungsform des erfindungsgemäßen Pressschuhes, wobei der Pressschuh aus unterschiedlichen Materialien besteht.
The invention is explained in more detail below with reference to embodiments with reference to the drawings; in this show:
FIG. 1
a schematic longitudinal sectional view of a Yankee cylinder with associated conventional press shoe comprehensive shoe press in the unloaded state,
FIG. 2
a schematic longitudinal sectional view of a Yankee cylinder associated with conventional press shoe shoe press in the operating state (vapor pressure, temperature, pressure),
FIG. 3
a schematic longitudinal sectional view of a shoe press according to the invention in the operating state with a Yankee cylinder and a press shoe associated therewith according to the invention,
FIG. 4
a schematic partial view of another embodiment of the press shoe according to the invention, wherein only on the side facing away from the press nip side of the press shoe, a corresponding reduction in thickness is provided and the thickness in a respective edge region to the relevant shoe edge gradually becomes smaller,
FIG. 5
a schematic end view of the press shoe according to Figure 4,
FIG. 6
a schematic partial view of another embodiment of the press shoe according to the invention, wherein in a respective edge region of the press shoe on the from Pressing gap facing away from a plurality of extending in the web running direction cuts is provided
FIG. 7
a schematic partial view of another embodiment of the press shoe according to the invention, wherein in a respective edge region of the press shoe on the side facing the press nip a continuous thickness reduction is provided for the respective shoe edge,
FIG. 8
a schematic partial view of a further embodiment of the press shoe according to the invention, wherein in a respective edge region of the press shoe on the side facing away from the press nip transversely extending incisions are provided whose depth increases towards the respective shoe edge,
FIG. 9
a schematic end view of the press shoe according to Figure 8 in the direction of the arrow "A" of Figure 8 and
FIG. 10
a schematic partial view of another embodiment of the press shoe according to the invention, wherein the press shoe consists of different materials.

Figur 1 zeigt in schematischer Längsschnittdarstellung eine einen Trockenzylinder 10, insbesondere Yankee-Zylinder, mit zugeordnetem herkömmlichen Pressschuh 12 umfassende Schuhpresse 14 im nicht belasteten Zustand. Der Mantel 16 des Trockenzylinders 10 ist im vorliegenden Fall also nicht durchgebogen.Figure 1 shows a schematic longitudinal sectional view of a drying cylinder 10, in particular Yankee cylinder, with associated conventional press shoe 12 comprehensive shoe press 14 in the unloaded state. The jacket 16 of the drying cylinder 10 is thus not bent in the present case.

Der Pressschuh 12 wird durch wenigstens eine Reihe von Anpresselemente 18 gegen den Trockenzylinder 10 gepresst. Der Pressschuh 12 bildet mit dem Trockenzylinder 10 den Pressspalt 20, durch den die Tissuebahn zusammen mit wenigstens einem Trägerband (nicht gezeigt) geführt wird. Vorzugsweise läuft die Tissuebahn zusammen mit einem wasserundurchlässigen Pressmantel und einem Filz (wasseraufnehmend) durch diesen Pressspalt oder Nip 20.The press shoe 12 is pressed against the drying cylinder 10 by at least one row of pressing elements 18. The press shoe 12 forms with the drying cylinder 10 the press nip 20, through which the tissue web is guided together with at least one carrier tape (not shown). The tissue web preferably runs together with a water-impermeable press jacket and a felt (water-absorbent) through this press nip or nip 20.

Figur 2 zeigt eine mit der der Figur 1 vergleichbare Darstellung der Schuhpresse 14 im belasteten Zustand, d.h. im Betriebszustand. Im Betriebszustand verformt sich die Kontur des Trockenzylinders 10 durch den Zylinderinnendruck (Dampf) und eine stärkere Ausdehnung der Stirndeckel des Trockenzylinders infolge der Dampftemperatur sowie durch andere konstruktionsbedingte Faktoren. Desweiteren wird die Kontur des Trocken- bzw. Yankee-Zylinders 10 insbesondere im Bereich des Pressnips 20 durch unterschiedliche Pressdrücke bzw. Linienkräfte beeinflusst. Der Mantel 16 des Trockenzylinders 22 ist hier also durchgebogen. Wie anhand der Figur 2 zu erkennen ist, ergibt sich eine entsprechende Durchbiegung auch bei dem Pressschuh 12.Figure 2 shows a comparable to that of Figure 1 representation of the shoe press 14 in the loaded state, i. in the operating state. In operation, the contour of the drying cylinder 10 deformed by the in-cylinder pressure (steam) and a greater expansion of the front cover of the drying cylinder due to the steam temperature and by other design-related factors. Furthermore, the contour of the drying or Yankee cylinder 10, in particular in the region of the press nip 20, is influenced by different pressing pressures or line forces. The jacket 16 of the drying cylinder 22 is here so bent. As can be seen with reference to FIG. 2, a corresponding deflection also results in the press shoe 12.

Der in den Figuren 1 und 2 dargestellte herkömmliche Pressschuh 12 besitzt eine über die Breite konstante Dicke.The conventional press shoe 12 shown in FIGS. 1 and 2 has a thickness which is constant over the width.

Figur 3 zeigt in schematischer Längsschnittdarstellung eine erfindungsgemäße Schuhpresse 21 mit einem Trockenzylinder 22, insbesondere Yankee-Zylinder, und einem diesem zugeordneten erfindungsgemäßen Pressschuh 24 mit zugeordneten Anpresselementen 26, die in zumindest einer sich quer zur Bahnlaufrichtung erstreckenden Reihe angeordnet sind und über die der Pressschuh 24 gegen den Trockenzylinder 22 pressbar ist. Der Pressschuh 24 kann einteilig oder auch mehrteilig ausgeführt sein. In dieser Figur 3 ist die Schuhpresse 22 im Betriebszustand dargestellt.FIG. 3 shows a schematic longitudinal section of a shoe press 21 according to the invention with a drying cylinder 22, in particular a Yankee cylinder, and a press shoe 24 according to the invention with associated pressing elements 26 arranged in at least one row extending transversely to the web running direction and over which the press shoe 24 is pressed against the drying cylinder 22. The press shoe 24 can be made in one or more parts be. In this figure 3, the shoe press 22 is shown in the operating state.

Der Pressschuh 24 bildet mit dem Trockenzylinder 22 den Pressspalt 28, durch den die Tissuebahn zusammen mit wenigstens einem Trägerband (nicht gezeigt) geführt wird. Vorzugsweise läuft die Tissuebahn wieder zusammen mit einem wasserundurchlässigen Pressmantel und einem Filz (wasseraufnehmend) durch diesen Pressspalt oder Nip 28.The press shoe 24 forms with the drying cylinder 22 the press nip 28, through which the tissue web is guided together with at least one carrier tape (not shown). Preferably, the tissue web again runs along with a water-impervious press cover and a felt (water-absorbent) through this press nip or nip 28.

Der Mantel 30 des Trockenzylinders 22 ist im dargestellten Betriebszustand durchgebogen. Wie anhand der Figur 3 zu erkennen ist, ergibt sich eine entsprechende Durchbiegung auch wieder bei dem Pressschuh 24.The jacket 30 of the drying cylinder 22 is bent in the illustrated operating state. As can be seen from FIG. 3, a corresponding deflection also results again for the press shoe 24.

Im vorliegenden Fall sind den beiden seitlichen Randbereichen R des Pressschuhs 24 jeweils mehrere, hier z.B. drei Anpresselemente 261 - 263 zugeordnet. Dem mittleren Bereich können Anpresselemente 26z zugeordnet sein (vgl. die Figuren 4 und 6).In the present case, the two lateral edge regions R of the press shoe 24 each have a plurality of, for example, three pressing elements 26 1 - 26 3 assigned. The middle region can be assigned pressing elements 26 z (cf., FIGS. 4 and 6).

Wie anhand der Figur 3 zu erkennen ist, besitzt der Pressschuh 24 in seinen beiden seitlichen, den Bahnrändern benachbarten Randbereichen R zumindest abschnittsweise eine geringere Dicke d als in seinem dazwischen liegenden mittleren Bereich M.As can be seen with reference to FIG. 3, press shoe 24 has, in its two lateral edge regions R adjacent to the web edges, at least in sections a smaller thickness d than in its intermediate region M located therebetween.

Dabei können, wie anhand des linken Teils der Figur 3 zu erkennen ist, zur Bildung einer entsprechenden Dickenreduzierung 34 beispielsweise auf der vom Pressspalt 28 abgewandten Seite des Pressschuhs 24 Materialaussparungen in Form von Einschnitten 32 oder dergleichen vorgesehen sein, die sich im vorliegenden Fall beispielsweise in Bahnlaufrichtung erstrecken.It can, as can be seen from the left part of Figure 3, to form a corresponding reduction in thickness 34, for example, on the side facing away from the press nip 28 side of the press shoe 24 material recesses 32 or the like may be provided in the present case, for example in Stretch web direction.

Wie anhand des rechten Teils der Figur 3 zu erkennen ist, kann in einem jeweiligen Randbereich R auch eine zumindest im wesentlichen durchgehende Dickenreduzierung 34 vorgesehen sein. Diese Dickenreduzierung 34 ist auch im vorliegenden Fall z.B. wieder auf der vom Pressspalt 28 abgewandten Seite des Pressschuhes 24 vorgesehen. Wie in der Figur 3 gezeigt, kann der Übergang vom mittleren Bereich M in den dickenreduzierten Randbereich R beispielsweise kontinuierlich verlaufen.As can be seen from the right-hand part of FIG. 3, an at least substantially continuous thickness reduction 34 can also be provided in a respective edge region R. This thickness reduction 34 is also in the present case e.g. again provided on the side facing away from the press nip 28 side of the press shoe 24. As shown in FIG. 3, the transition from the middle region M into the thickness-reduced edge region R can, for example, run continuously.

Zumindest die den beiden Randbereichen R des Pressschuhs 24 zugeordneten Anpresselemente 26 sind wenigstens teilweise getrennt ansteuerbar. Die insbesondere hydraulischen Anpresselemente 26i - 263 können also insbesondere mit unterschiedlichen Drücken beaufschlagt werden, wodurch entsprechend unterschiedliche Anpresskräfte erzeugt werden. Dabei können die Anpresselemente so angesteuert werden, dass sich im Pressspalt 28 ein zumindest im wesentlichen gleichmäßiges Pressdruckquerprofil oder Linienkraftprofil ergibt. Grundsätzlich können auch dem mittleren Bereich M entsprechende Anpresselemente 26z (vgl. die Figuren 4 und 5) zugeordnet sein. Auch diese mittleren Anpresselemente 26z können grundsätzlich zumindest teilweise wieder getrennt ansteuerbar sein.At least the two edge regions R of the press shoe 24 associated pressing members 26 are at least partially controlled separately. The particular hydraulic pressure elements 26 i - 26 3 can thus be applied in particular with different pressures, whereby correspondingly different contact forces are generated. In this case, the pressing elements can be controlled so that in the press nip 28 results in an at least substantially uniform compression cross-pressure profile or line force profile. In principle, it is also possible to associate pressing elements 26 z corresponding to the central region M (see FIGS. 4 and 5). These middle contact pressure elements 26 z can in principle be at least partially separately controlled again.

Ein jeweiliger Randbereich R geringerer Dicke d kann beispielsweise eine quer zur Maschinenlaufrichtung gemessene Breite von höchstens etwa 1000 mm, insbesondere von höchstens etwa 700 mm und vorzugsweise von höchstens etwa 500 mm besitzen.A respective edge region R of lesser thickness d may, for example, have a width measured transversely to the machine direction of at most about 1000 mm, in particular of at most about 700 mm and preferably of at most about 500 mm.

Figur 4 zeigt in schematischer Teildarstellung eine weitere Ausführungsform des erfindungsgemäßen Pressschuhes 24, bei dem wieder nur auf der vom Pressspalt abgewandten Seite eine entsprechende Dickenreduzierung 34 vorgesehen ist. Im vorliegenden Fall wird die Dicke in einem jeweiligen Randbereich R zum betreffenden Schuhrand R' hin stufenweise kleiner. Dabei kann zwischen den einzelnen Stufen 34', wie dargestellt, beispielsweise ein kontinuierlicher Übergang erfolgen.Figure 4 shows a schematic partial view of a further embodiment of the press shoe 24 according to the invention, in which again only on the side facing away from the press nip side a corresponding reduction in thickness 34 is provided. In the present case, the thickness in a respective edge region R becomes gradually smaller towards the relevant shoe edge R '. It can take place between the individual stages 34 ', as shown, for example, a continuous transition.

Einem jeweiligen entsprechend dickenreduzierten Randbereich R sind wieder getrennt ansteuerbare Anpresselemente 261, 262 zugeordnet. Im vorliegenden Fall sind einem jeweiligen Randbereich R beispielsweise zwei solche Anpresselemente 261, 262 zugeordnet. Der mittlere Bereich M des Pressschuhes ist über Anpresselemente 26z beaufschlagbar, die ebenfalls zumindest teilweise wieder getrennt ansteuerbar sein können.A respective correspondingly reduced thickness edge region R are again assigned separately controllable pressing elements 26 1 , 26 2 . In the present case, two such pressing elements 26 1 , 26 2 are assigned to a respective edge region R, for example. The middle region M of the press shoe is acted upon by pressing elements 26 z , which can also be at least partially separately controlled again.

Figur 5 zeigt eine schematische Stirnansicht des Pressschuhes 24 gemäß Figur 4.FIG. 5 shows a schematic end view of the press shoe 24 according to FIG. 4.

Figur 6 zeigt in schematischer Teildarstellung eine weitere Ausführungsform des erfindungsgemäßen Pressschuhes 24, bei dem ebenfalls wieder nur auf der vom Pressspalt abgewandten Seite eine jeweilige Dickenreduzierung 34 vorgesehen ist. Im vorliegenden Fall sind in einem jeweiligen Randbereich R mehrere sich hier beispielsweise in Bahnlaufrichtung erstreckende Einschnitte 32 vorgesehen. Den Randbereichen R sind jeweils wieder mehrere zumindest teilweise getrennt ansteuerbare Anpresselemente 261- 263 zugeordnet. Auch der mittlere Bereich wird hier wieder von entsprechenden Anpresselementen 26z beaufschlagt.FIG. 6 shows, in a schematic partial representation, a further embodiment of the press shoe 24 according to the invention, in which again a respective reduction in thickness 34 is again provided only on the side facing away from the press nip. In the present case, a plurality of incisions 32 extending here, for example in the web running direction, are provided in a respective edge region R. The edge regions R are each again assigned at least partially separately controllable pressing elements 26 1 - 26 3 . Also, the central region is again acted upon by corresponding pressing elements 26 z .

Figur 7 zeigt in schematischer Teildarstellung eine weitere Ausführungsform des erfindungsgemäßen Pressschuhes 24, wobei in diesem Fall die entsprechende Dickenreduzierung 34 jedoch auf der dem Pressspalt zugewandten Seite des Pressschuhs 24 vorgesehen ist. Dabei wird die Dicke d des Pressschuhes 24 in einem jeweiligen Randbereich R zum betreffenden Schuhrand R' hin zunehmend kleiner.FIG. 7 shows, in a schematic partial representation, a further embodiment of the press shoe 24 according to the invention, but in this case the corresponding reduction in thickness 34 on the press nip facing side of the press shoe 24 is provided. In this case, the thickness d of the press shoe 24 becomes increasingly smaller in a respective edge region R for the relevant shoe edge R '.

Auch im vorliegenden Fall sind insbesondere den Randbereichen R wieder getrennt ansteuerbare Anpresselemente (nicht gezeigt) zugeordnet.Also in the present case, in particular the edge regions R are again assigned separately controllable pressing elements (not shown).

Figur 8 zeigt in schematischer Teildarstellung eine weitere Ausführungsform des erfindungsgemäßen Pressschuhes 24, bei dem die betreffende Dickenreduzierung 34 in den Randbereichen R jedoch wieder auf der vom Pressspalt abgewandten Seite des Pressschuhes 24 vorgesehen ist. In diesem Fall sind sich in Querrichtung erstreckende Einschnitte 34 vorgesehen, deren Tiefe zum jeweiligen Schuhrand R' hin zunimmt.FIG. 8 shows, in a schematic partial representation, a further embodiment of the press shoe 24 according to the invention, in which, however, the respective thickness reduction 34 in the edge regions R is again provided on the side of the press shoe 24 facing away from the press nip. In this case, transversely extending incisions 34 are provided, the depth of which increases towards the respective shoe edge R '.

Figur 9 zeigt eine schematische Stirnansicht eines Teils des Pressschuhes 24 gemäß Figur 8 in Richtung des Pfeils "A" der Figur 8.FIG. 9 shows a schematic end view of a part of the press shoe 24 according to FIG. 8 in the direction of the arrow "A" of FIG. 8.

Figur 10 zeigt in schematischer Teildarstellung eine weitere Ausführungsform des erfindungsgemäßen Pressschuhes 24, wobei in diesem Fall der Pressschuh 24 aus unterschiedlichen Materialien besteht. Es ist beispielsweise möglich, dass der Pressschuh 24 im Randbereich R teilweise oder ganz aus einem biegeweicheren Material besteht als im mittleren Bereich M.FIG. 10 shows, in a schematic partial representation, a further embodiment of the press shoe 24 according to the invention, in which case the press shoe 24 consists of different materials. It is possible, for example, that the press shoe 24 in the edge region R consists partly or entirely of a material that is more flexible than in the middle region M.

Wie anhand der Figur 10 zu erkennen ist, kann der Pressschuh 24 beispielsweise aus einem ersten Material 36, z.B. Messing oder dergleichen, und einem Trägermaterial 38, z.B. faserverstärktem Kunststoff oder dergleichen, bestehen. Beim vorliegenden Ausführungsbeispiel ist das Trägermaterial im Randbereich R dickenreduziert.As can be seen with reference to FIG. 10, press shoe 24 may consist, for example, of a first material 36, eg brass or the like, and a carrier material 38, eg fiber-reinforced plastic or the like. In the present embodiment, the carrier material in the edge region R is reduced in thickness.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Trockenzylinder, Yankee-ZylinderDrying cylinder, Yankee cylinder
1212
Pressschuhpress shoe
1414
Schuhpresseshoe press
1616
Mantelcoat
1818
Anpresselementpresser
2020
Pressspalt, NipPress nip, nip
2121
Schuhpresseshoe press
2424
Pressschuhpress shoe
2626
Anpresselementpresser
2828
Pressspalt, NipPress nip, nip
3030
Mantelcoat
3232
Materialaussparung, EinschnittMaterial recess, incision
3434
Dickenreduzierungthickness reduction
34'34 '
Stufestep
3636
Materialmaterial
3838
Trägermaterialsupport material
MM
mittlerer Bereichmiddle area
RR
Randbereichborder area
R'R '
SchuhrandShoe edge
dd
Dickethickness

Claims (32)

  1. Machine for producing a tissue web, comprising a shoe press unit having a press shoe (24), it being possible for the press shoe (24) to be pressed against the circumference (30) of a drying cylinder (10) by a plurality of pressing elements (26), forming a press nip (28), through which the tissue web to be formed or to be treated can be led, and the plurality of pressing elements being arranged transversely with respect to the web running direction, characterized in that, within the press nip (28), in its two lateral edge regions (R) adjacent to the web edges, the press shoe (24) has a lower flexural rigidity, at least in some sections, than in its central region (M) lying between them, and in that at least the pressing elements (26) assigned to the two edge regions (R) can be activated at least partly separately.
  2. Machine for producing a tissue web according to Claim 1, characterized in that the press shoe has a lower thickness (d) in the edge regions (R) than in its central region (M) lying between them.
  3. Machine for producing a tissue web according to Claim 1, characterized in that the material of the press shoe (24) in the edge regions (R) is selected in such a way that the press shoe (24) has a lower flexural rigidity in these edge regions (R) than in its central region (M) lying between them.
  4. Machine for producing a tissue web according to one of the preceding claims, characterized in that a respective edge region (R) of lower flexural rigidity has a width measured transversely with respect to the machine running direction of at most about 1000 mm, in particular of at most about 700 mm and preferably of at most about 500 mm.
  5. Machine for producing a tissue web according to one of the preceding claims, characterized in that the width of a respective edge region (R) extends over two pressing elements, preferably over three pressing elements and in particular over four pressing elements.
  6. Machine for producing a tissue web according to one of the preceding claims, characterized in that the thickness (d) in a respective edge region (R) becomes continuously smaller towards the relevant shoe edge (R').
  7. Machine for producing a tissue web according to Claim 6, characterized in that the thickness (d) in a respective edge region (R) becomes smaller in steps towards the relevant shoe edge (R').
  8. Machine for producing a tissue web according to Claim 7, characterized in that a continuous transition is made between the individual steps (34').
  9. Machine for producing a tissue web according to Claim 6, characterized in that the thickness (d) in a respective edge region (R) becomes smaller, continuously or steadily, at least in some sections, towards the relevant shoe edge (R').
  10. Machine for producing a tissue web according to one of the preceding claims, characterized in that the press shoe in a respective edge region (R) has a plurality of local material cut-outs (32).
  11. Machine for producing a tissue web according to Claim 10, characterized in that the material cut-outs are formed by incisions (32).
  12. Machine for producing a tissue web according to Claim 11, characterized in that the incisions (32) extend at least partly in the transverse direction.
  13. Machine for producing a tissue web according to either of Claims 11 and 12, characterized in that the incisions (32) extend at least partly in the web running direction.
  14. Machine for producing a tissue web according to one of Claims 10 to 13, characterized in that the material cut-outs (32) are of the same size.
  15. Machine for producing a tissue web according to one of Claims 10 to 14, characterized in that the material cut-outs (32) are formed by incisions of constant depth.
  16. Machine for producing a tissue web according to one of Claims 10 to 14, characterized in that the material cut-outs (32) are formed by incisions of variable depth.
  17. Machine for producing a tissue web according to Claim 16, characterized in that the incisions (32) extend at least partly in the transverse direction and the incisions each have a depth increasing towards the relevant shoe edge (R').
  18. Machine for producing a tissue web according to one of Claims 10 to 13 and 15 to 17, characterized in that the material cut-outs (32) have a different size, at least to some extent.
  19. Machine for producing a tissue web according to one of Claims 10 to 14 and 16 to 18, characterized in that the material cut-outs (32) are formed by incisions of different depth.
  20. Machine for producing a tissue web according to Claim 19, characterized in that the depth of the incisions (32) becomes greater towards the relevant shoe edge (R').
  21. Machine for producing a tissue web according to one of Claims 10 to 20, characterized in that the material cut-outs (32) are arranged at the same distance from one another.
  22. Machine for producing a tissue web according to one of Claims 10 to 20, characterized in that the material cut-outs (32) are arranged more densely towards the relevant shoe edge (R').
  23. Machine for producing a tissue web according to one of Claims 2 and 4 to 22, characterized in that an appropriate thickness reduction (34) is provided only on that side of the press shoe which faces away from the press nip (28).
  24. Machine for producing a tissue web according to one of Claims 2 and 4 to 22, characterized in that a thickness reduction (34) is in each case provided both on the side of the press shoe facing away from the press nip (28) and on the side facing the press nip.
  25. Machine for producing a tissue web according to one of Claims 2 and 4 to 22, characterized in that an appropriate thickness reduction (34) is provided only on that side of the press shoe (24) which faces the press nip (28).
  26. Machine for producing a tissue web according to one of Claims 2 and 4 to 25, characterized in that a thickness reduction (34) that is continuous towards the relevant shoe edge (R') is provided in a respective edge region (R).
  27. Machine for producing a tissue web according to one of Claims 2 and 4 to 26, characterized in that the thickness reduction (34) provided in a respective edge region (R) is chosen such that the flexural rigidity of the press shoe (24) decreases towards the relevant shoe edge (R').
  28. Machine for producing a tissue web according to one of the preceding claims, characterized in that the press shoe is designed in one piece.
  29. Machine for producing a tissue web according to one of Claims 1 to 27, characterized in that the press shoe is designed in many parts.
  30. Machine for producing a tissue web according to one of the preceding claims, characterized in that the press shoe consists of different materials.
  31. Machine for producing a tissue web according to one of the preceding claims, characterized in that, in the edge regions (R), the press shoe consists at least partly of a more flexible material than in the central region (M).
  32. Machine for producing a tissue web according to one of the preceding claims, characterized in that the central region (M) is assigned pressing elements (26) which can be activated at least partly separately.
EP03100295A 2002-03-27 2003-02-12 Tissue papermaking machine with a shoe press Expired - Lifetime EP1348804B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10213852 2002-03-27
DE10213852A DE10213852A1 (en) 2002-03-27 2002-03-27 press shoe

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EP1348804A1 EP1348804A1 (en) 2003-10-01
EP1348804B1 true EP1348804B1 (en) 2006-05-03

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US (1) US6998025B2 (en)
EP (1) EP1348804B1 (en)
AT (1) ATE325229T1 (en)
BR (1) BR0300897A (en)
DE (2) DE10213852A1 (en)

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DE102004026372A1 (en) * 2004-05-29 2005-12-15 Voith Paper Patent Gmbh shoe press
DE102019104389A1 (en) * 2019-02-21 2020-08-27 Voith Patent Gmbh Shoe press

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US4428797A (en) * 1981-05-26 1984-01-31 Beloit Corporation Extended nip shoe for a nip in a papermaking machine
US4427492A (en) * 1981-05-26 1984-01-24 Beloit Corporation Extended nip shoe for a nip in a papermaking machine
DE3239954C2 (en) * 1982-10-28 1984-10-18 J.M. Voith Gmbh, 7920 Heidenheim Roller press for webs of paper, textiles or the like.
DE4319323A1 (en) * 1993-06-11 1993-11-04 Voith Gmbh J M Paper-making press section - has units to reduce pressure at web edges to ends of the press shoe to eliminate pressure peaks
DE4401580A1 (en) * 1994-01-20 1994-06-01 Voith Gmbh J M Paper making press section - has reduced stiffness at edges of units forming press gap to reduce wear at edges
DE19520442C2 (en) * 1995-06-03 2000-05-31 Voith Sulzer Papiermasch Gmbh Roller press
DE19642049A1 (en) * 1996-10-11 1998-04-16 Voith Sulzer Papiermasch Gmbh Press arrangement on a paper or paperboard machine
DE19642943A1 (en) * 1996-10-17 1998-04-23 Voith Sulzer Papiermasch Gmbh Paper-making press section
DE19941336A1 (en) * 1999-08-31 2001-03-01 Voith Paper Patent Gmbh Drying device
DE10032251A1 (en) * 2000-07-03 2002-01-17 Voith Paper Patent Gmbh Water extraction station for a web of tissue/toilet paper has a shoe press unit at the drying cylinder with an extended press gap and a suction unit within an overpressure hood at the carrier belt
FI108877B (en) * 2000-11-02 2002-04-15 Metso Paper Inc Pressko

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ATE325229T1 (en) 2006-06-15
DE50303154D1 (en) 2006-06-08
EP1348804A1 (en) 2003-10-01
DE10213852A1 (en) 2003-10-16
US6998025B2 (en) 2006-02-14
BR0300897A (en) 2004-08-17
US20030183359A1 (en) 2003-10-02

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