EP1754823B1 - Transfer belt - Google Patents

Transfer belt Download PDF

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Publication number
EP1754823B1
EP1754823B1 EP20060117369 EP06117369A EP1754823B1 EP 1754823 B1 EP1754823 B1 EP 1754823B1 EP 20060117369 EP20060117369 EP 20060117369 EP 06117369 A EP06117369 A EP 06117369A EP 1754823 B1 EP1754823 B1 EP 1754823B1
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EP
European Patent Office
Prior art keywords
transfer belt
belt according
lower side
storage volume
web
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.)
Active
Application number
EP20060117369
Other languages
German (de)
French (fr)
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EP1754823A3 (en
EP1754823A2 (en
Inventor
Arved Westerkamp
Daniel Gronych
Robert Koplin
Klaus Hermann
Georg Dr. Kleiser
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Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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Publication date
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Priority to EP11159704.3A priority Critical patent/EP2360314B1/en
Publication of EP1754823A2 publication Critical patent/EP1754823A2/en
Publication of EP1754823A3 publication Critical patent/EP1754823A3/en
Application granted granted Critical
Publication of EP1754823B1 publication Critical patent/EP1754823B1/en
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Classifications

    • 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
    • D21F3/08—Pressure rolls
    • D21F3/086—Pressure rolls having a grooved surface
    • 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
    • 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
    • D21F3/04—Arrangements thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/086—Substantially impermeable for transferring fibrous webs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/901—Impermeable belts for extended nip press
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]

Definitions

  • the invention relates to a transfer belt for a machine for producing a material web, in particular a paper, board or tissue web (see EP-A-0 548 038 ).
  • Paper, board or tissue machines may have central roll presses.
  • central roll presses with a roller and a plurality of this roller associated counter-rollers, each forming a press nip with the roller, the wet fibrous web is drawn by an open draw from the smooth roller (central roller). This considerable withdrawal forces are exerted on the fibrous web.
  • a transfer belt wrapping the center roll is proposed in the prior art, with which the fibrous web is guided by the press nips and from which the fibrous web can be removed by means of, for example, a take-off suction roll.
  • a closed press section is known in a paper machine in which the rollers form roll nips between each other, between which nips the web has a closed train supported by the surface of a fabric, and with a central roll against which at least two nips are formed, through which a transfer belt is directed.
  • the transfer belt forms a closed loop around the central roll, on the outer surface of which the web is closed after the last nip and continuously transferred under tension to a dryer wire or equivalent fabric in a post-press section, wherein the transfer belt fabric does not rewet the web ,
  • the web adhesion properties of the outer surface of the transfer belt webbing are selected such that the web follows the transfer web web after the last nip.
  • the center roll is a roll having a dimpled surface, and the transfer belt fabric is permeable to a certain degree.
  • the known transfer belt has an upper side and a lower side arranged opposite the upper side, wherein, when the intended use of the endless belt, the upper side can be brought into contact with the material web, in particular with the paper, board or tissue web, and the lower side with the machine.
  • the endless belt has a storage volume for receiving fluid, which acts on the underside.
  • the underside is formed according to the invention by an impermeable polymeric layer, wherein the storage volume is at least partially provided by the surface structure of the bottom.
  • the fluid acting on the underside of the transfer belt is at least partially taken up in the transfer belt.
  • the fluid can be led away from the contact region between the lateral surface of a roller and the underside of the transfer belt. Therefore, the fluid acting on the underside of the transfer belt, for example, water and / or air, not or only partially build up as a fluid layer between the lateral surface of the roller and the underside of the transfer belt.
  • the risk of aquaplaning between the transfer belt and the roll shell is prevented or at least considerably reduced.
  • the storage volume is at least partially provided by an at least partially porous structure of the transfer belt.
  • the porous structure may, for example, comprise a nonwoven and / or a woven fabric and / or a foamed structure which extends at least in the area of the underside of the transfer tape.
  • a preferred embodiment of the invention provides that the surface structure is designed such that fluid can be led away from the press nip when passing through a press nip.
  • the surface structure may in this case form a regular or an irregular pattern.
  • the surface structure is formed such that the storage volume is maintained under pressure in a press nip substantially.
  • the transfer belt has a storage volume which changes transversely to the direction of travel.
  • drag effects in the edge region of the transfer belt can be compensated.
  • the surface structure forms a regular pattern in sections and an irregular pattern on the underside in sections.
  • the surface structure comprises a groove.
  • the effect of the scoring is particularly effective if it extends at least in sections along the direction of the transfer belt. The best results are obtained when the grooving extends substantially along the direction of travel of the transfer belt.
  • the grooves in this case preferably have a width between 0.2 and 10 mm, preferably between 1 and 5 mm, wherein the depth of the grooves is advantageously less than 50% of the total thickness of the transfer belt.
  • An irregular surface structure can be provided, for example, by the spacing and / or the cross-sectional area and / or the shape of at least two adjacent grooves being different.
  • the surface structure comprises a roughness Ra of the bottom of 3 to 40 .mu.m.
  • the surface structure can be formed solely by the roughness or the roughness is part of the surface structure.
  • the roughness described above can be achieved, for example, by sanding the underside or by using a correspondingly granular material for the production of the underside.
  • the underside is formed by a permeable or impermeable polymeric layer, wherein the surface structure is produced in the preparation of the polymeric layer and / or after the preparation of the polymeric layer.
  • the surface structure may be formed by casting or molding in the preparation of the polymeric layer.
  • the surface structure after the preparation of the polymeric layer can be produced by mechanical and / or thermal and / or chemical processing of the polymeric layer.
  • FIG. 1 shows a machine 1 according to the invention with a central roller press 2.
  • the central roller press 2 comprises a roller 3, also called central roller 3.
  • the central roller 3 has a smooth lateral surface 4.
  • the central roller 3 are associated with two counter-rollers 5 and 6, which each form a press nip 7 and 8 with the central roller 3.
  • the central roller 3 is further wrapped by a transfer belt 9 in sections such that the transfer belt 9 is guided by the two press nips 7 and 8.
  • the transfer belt 9 has an upper side 11, which can be brought into contact with a fibrous web 10, and a lower side 12, which contacts the lateral surface 4 of the roller 3 in the entire wrapping area.
  • the fibrous web 10 and the transfer belt 9 are guided together through the two press nips 7 and 8, wherein the transfer belt 9 is in contact with the roller 3.
  • a storage structure is provided by a surface structure of the underside 12, which is suitable to at least partially accommodate water and / or air, which penetrates into the wrap between the bottom 12 and lateral surface 4.
  • the underside 12 of the transfer belt 9 is formed by a polymeric layer, such as polyurethane, wherein the surface structure is formed by a groove with grooves 15, which form recesses in the bottom 12, and interposed webs 16, the in the production of the bottom 12, for example by casting, are generated (see FIG. 2 ).
  • a polymeric layer such as polyurethane
  • the grooves 15 extend in this case substantially along the direction of travel (MD direction) of the endless belt 9, whereby fluid can be taken during the passage through a press nip from the press nip and led away.
  • the underside 12 is in this case designed such that the storage volume is maintained under pressure in a press nip substantially.
  • the ratio of land width to groove width is two, with the grooves having a width of 3mm. Due to the surface structure of the bottom 12, a storage volume of 400 milliliters per m 2 area of the bottom 12 is provided.
  • the underside 12 of the endless belt 9 is outside the wrap area a scraper 13 for stripping fluid and a spray tube 14 for cleaning the bottom 12 assigned.
  • the scraper 13 is a soft scraper plastic scraper without fiber reinforcement.
  • the angle of attack of the scraper 13 is approximately 10 ° relative to the bottom 12.
  • the lateral surface 4 of the roller 3 outside of the belt area scraper 17 and 18 for stripping fluid and spray tubes 19 and 20 for cleaning the lateral surface 4 are assigned.
  • the fibrous web 10 Before the fibrous web 10 passes through the central roll press 2, it passes between two press felts 23 and 24 between the counter roll 5 and another roll 21 formed press nip 22, wherein the press felt 23 is also guided by the formed between the central roll 3 and counter roll 5 Press nip 7 so that the pulp 10 contacts the press felt 23 on its one side and the transfer belt 9 on its other side when passing through the press nip 7.
  • the fiber material 10 also contacts on its one side a press felt 25 and on its other side the transfer belt 9.
  • the fibrous web 2 After passing through the fibrous web 10 through the Gottwalzenpresse2, the fibrous web 2 is removed from the transfer belt 9 by means of an evacuated pick-up roller 26 and transferred to a clothing 27.
  • the Fig. 3 shows various variants of grooves for endless belts according to the invention or roll shells in cross section.
  • the grooves 15 have a semicircular cross-section.
  • the grooves 15 have a trapezoidal cross-section.
  • grooves 15 have a triangular cross-section.
  • the Fig. 4 shows different variants of surface structures for endless belts according to the invention or roller shells in a plan view of the underside 12 or on the lateral surface 4.
  • the surface structure has irregularly formed recesses 15 forming recesses.
  • the surface structure has grooves 15 which extend diagonally to the running direction (MD direction) and form recesses.
  • the surface structure has diamond-shaped elevations 28.

Description

Die Erfindung betrifft ein Transferband für eine Maschine zur Herstellung einer Materialbahn, insbesondere einer Papier-, Karton- oder Tissuebahn (siehe EP-A-0 548 038 ).The invention relates to a transfer belt for a machine for producing a material web, in particular a paper, board or tissue web (see EP-A-0 548 038 ).

Papier-, Karton- oder Tissuemaschinen können Zentralwalzenpressen aufweisen. Bei den aus dem Stand der Technik bekannten Zentralwalzenpressen mit einer Walze und mehreren dieser Walze zugeordneten Gegenwalzen, die jeweils mit der Walze einen Pressnip bilden, wird die feuchte Faserstoffbahn durch einen offenen Zug von der glatten Walze (Zentralwalze) abgezogen. Hierbei werden erhebliche Abzugskräfte auf die Faserstoffbahn ausgeübt.Paper, board or tissue machines may have central roll presses. In the known from the prior art central roll presses with a roller and a plurality of this roller associated counter-rollers, each forming a press nip with the roller, the wet fibrous web is drawn by an open draw from the smooth roller (central roller). This considerable withdrawal forces are exerted on the fibrous web.

Um die Abzugskräfte zu reduzieren wird im Stand der Technik ein die Zentralwalze umschlingendes Transferband vorgeschlagen, mit dem die Faserstoffbahn durch die Pressnips geführt wird und von dem die Faserstoffbahn mittels bspw. einer Abnahmesaugwalze abgenommen werden kann.In order to reduce the pull-off forces, a transfer belt wrapping the center roll is proposed in the prior art, with which the fibrous web is guided by the press nips and from which the fibrous web can be removed by means of, for example, a take-off suction roll.

Dringt im Umschlingungsbereich zwischen Zentralwalze und Transferband Feuchtigkeit ein, so tritt Schlupf zwischen der angetriebenen Zentralwalze und dem mitlaufenden Transferband auf, was zu Aquaplaning führt. Dies hat zur Folge, dass die Antriebsleistung der Zentralwalze nur ungenügend auf das Transferband übertragen werden kann, was zu Bahnabrissen oder zum Verlaufen des Transferbandes und damit verbunden, zu einer Beschädigung der Maschine führen kann.If moisture penetrates in the area between the center roller and the transfer belt, slippage occurs between the driven central roller and the moving transfer belt, which leads to aquaplaning. This has the consequence that the drive power of the central roller can only be transferred to the transfer belt insufficiently, which can lead to web breaks or to the running of the transfer belt and, associated therewith, to damage to the machine.

Aus der EP 0 548 038 A1 ist eine geschlossene Pressenpartie in einer Papiermaschine bekannt, in welcher die Walzen miteinander Walzennips bilden, zwischen welchen Nips die Bahn einen geschlossenen von der Fläche eines Gewebes gestützten Zug hat, und mit einer Zentralwalze, gegen welche zumindest zwei Nips ausgebildet sind, durch die ein Transferband geleitet wird. Das Transferband bildet um die Zentralwalze herum eine geschlossene Schleife, an deren Außenfläche die Bahn nach dem letzten Nip geschlossen und stetig unter Zug auf ein Trockensieb oder ein entsprechendes Gewebe in einer nach der Pressenpartie folgenden Trockenpartie transferiert wird, wobei das Transferbandgewebe die Bahn nicht erneut befeuchtet. Die Bahnadhäsionseigenschaften der Außenfläche des Transferbandgewebes sind derart gewählt, dass die Bahn nach dem letzten Nip dem Transferbandgewebe folgt. Die Zentralwalze ist eine Walze mit einer mit Vertiefungen versehenen Fläche, und das Transferbandgewebe ist bis zu einen bestimmten Grad wasserdurchlässig.From the EP 0 548 038 A1 a closed press section is known in a paper machine in which the rollers form roll nips between each other, between which nips the web has a closed train supported by the surface of a fabric, and with a central roll against which at least two nips are formed, through which a transfer belt is directed. The transfer belt forms a closed loop around the central roll, on the outer surface of which the web is closed after the last nip and continuously transferred under tension to a dryer wire or equivalent fabric in a post-press section, wherein the transfer belt fabric does not rewet the web , The web adhesion properties of the outer surface of the transfer belt webbing are selected such that the web follows the transfer web web after the last nip. The center roll is a roll having a dimpled surface, and the transfer belt fabric is permeable to a certain degree.

Es ist die Aufgabe der vorliegenden Erfindung, ein Endlosband, insbesondere ein Transferband für eine Maschine zur Herstellung einer Materialbahn, insbesondere für eine Papier-, Karton- oder Tissuemaschine, vorzuschlagen, durch dessen Einsatz die oben beschriebene Problematik unterbunden oder zumindest reduziert werden kann.It is the object of the present invention to provide an endless belt, in particular a transfer belt for a machine for producing a material web, in particular for a paper, board or tissue machine, by the use of which the problem described above can be prevented or at least reduced.

Die Aufgabe wird gelöst durch ein Transferband mit den Merkmalen des Patentanspruchs 1.The object is achieved by a transfer belt having the features of patent claim 1.

Das bekannte Transferband, hat eine Oberseite und eine der Oberseite gegenüberliegend angeordneten Unterseite, wobei bei vorgesehener Verwendung des Endlosbandes die Oberseite mit der Materialbahn, insbesondere mit der Papier-, Karton- oder Tissuebahn, und die Unterseite mit der Maschine in Kontakt bringbar ist.The known transfer belt has an upper side and a lower side arranged opposite the upper side, wherein, when the intended use of the endless belt, the upper side can be brought into contact with the material web, in particular with the paper, board or tissue web, and the lower side with the machine.

Bei dem erfindungsgemäßen Endlosband ist darüber hinaus vorgesehen, dass das Endlosband ein Speichervolumen zur Aufnahme von Fluid hat, das auf die Unterseite einwirkt. Die Unterseite ist dabei erfindungsgemäß durch eine impermeable polymere Schicht gebildet, wobei das Speichervolumen zumindest teilweise durch die Oberflächenstruktur der Unterseite bereitgestellt wird.In the endless belt according to the invention, moreover, it is provided that the endless belt has a storage volume for receiving fluid, which acts on the underside. The underside is formed according to the invention by an impermeable polymeric layer, wherein the storage volume is at least partially provided by the surface structure of the bottom.

Durch die erfindungsgemäße Lösung wird das auf die Unterseite des Transferbandes einwirkende Fluid zumindest teilweise im Transferband aufgenommen. Hierdurch kann das Fluid aus dem Kontaktbereich zwischen der Mantelfläche einer Walze und der Unterseite des Transferbandes weggeführt werden. Daher kann sich das auf die Unterseite des Transferbandes einwirkende Fluid, bspw. Wasser und / oder Luft, nicht oder nur bedingt als Fluidschicht zwischen der Mantelfläche der Walze und der Unterseite des Transferbandes aufbauen. Hierdurch wird, insbesondere im Pressnip, die Aquaplaninggefahr zwischen Transferband und Walzenmantel unterbunden oder zumindest erheblich reduziert.By means of the solution according to the invention, the fluid acting on the underside of the transfer belt is at least partially taken up in the transfer belt. As a result, the fluid can be led away from the contact region between the lateral surface of a roller and the underside of the transfer belt. Therefore, the fluid acting on the underside of the transfer belt, for example, water and / or air, not or only partially build up as a fluid layer between the lateral surface of the roller and the underside of the transfer belt. As a result, in particular in the press nip, the risk of aquaplaning between the transfer belt and the roll shell is prevented or at least considerably reduced.

Nach einer Ausführungsform der Erfindung wird das Speichervolumen zumindest teilweise durch eine zumindest teilweise poröse Struktur des Transferbandes bereitgestellt. Die poröse Struktur kann bspw. ein Vlies und / oder ein Gewebe und / oder eine geschäumte Struktur umfassen, die sich zumindest im Bereich der Unterseite des Transferbandes erstreckt.According to one embodiment of the invention, the storage volume is at least partially provided by an at least partially porous structure of the transfer belt. The porous structure may, for example, comprise a nonwoven and / or a woven fabric and / or a foamed structure which extends at least in the area of the underside of the transfer tape.

Da das Fluidspeichervolumen des erfindungsgemäßen Transferbands begrenzt ist, sieht eine bevorzugte Ausgestaltung der Erfindung vor, dass die Oberflächenstruktur derart ausgebildet ist, dass Fluid beim Durchgang durch einen Pressnip aus dem Pressnip weggeführt werden kann. Hierdurch kann die Aquaplaninggefahr auf die Unterseite weiter reduziert werden, insbesondere beim Durchgang durch einen Pressnip und bei Einwirkung einer großen Fluidmenge. Die Oberflächenstruktur kann hierbei ein regelmäßiges oder ein unregelmäßiges Muster bilden.Since the fluid storage volume of the transfer tape according to the invention is limited, a preferred embodiment of the invention provides that the surface structure is designed such that fluid can be led away from the press nip when passing through a press nip. As a result, the risk of aquaplaning on the underside can be further reduced, in particular when passing through a press nip and when exposed to a large amount of fluid. The surface structure may in this case form a regular or an irregular pattern.

Vorzugsweise ist hierbei die Oberflächenstruktur derart ausgebildet, dass das Speichervolumen bei Druckbelastung in einem Pressnip im wesentlichen erhalten bleibt.Preferably, in this case, the surface structure is formed such that the storage volume is maintained under pressure in a press nip substantially.

Des weiteren ist es denkbar, dass das Transferband ein sich quer zur Laufrichtung änderndes Speichervolumen hat. Hierdurch können bspw. Schleppeffekte im Randbereich des Transferbandes ausgeglichen werden. In diesem Zusammenhang ist es bspw. denkbar, dass die Oberflächenstruktur abschnittweise ein regelmäßiges Muster und abschnittweise ein unregelmäßiges Muster auf der Unterseite bildet.Furthermore, it is conceivable that the transfer belt has a storage volume which changes transversely to the direction of travel. As a result, for example, drag effects in the edge region of the transfer belt can be compensated. In this context, it is conceivable, for example, that the surface structure forms a regular pattern in sections and an irregular pattern on the underside in sections.

Nach einer konkreten Ausgestaltung der oben genannten Ausführungsform umfasst die Oberflächenstruktur eine Rillung. Durch eine Rillung in der Unterseite wird eine gute Speicherwirkung und ein gutes Wasserabfuhrvermögen zur Verfügung gestellt.According to a specific embodiment of the abovementioned embodiment, the surface structure comprises a groove. By a grooving in the bottom of a good storage effect and a good water drainage capacity is provided.

Die Wirkung der Rillung ist besonders wirksam, wenn diese sich zumindest abschnittweise längs zur Laufrichtung des Transferbandes erstreckt. Die besten Ergebnisse werden erzielt, wenn sich die Rillung im wesentlichen längs zur Laufrichtung des Transferbandes erstreckt.The effect of the scoring is particularly effective if it extends at least in sections along the direction of the transfer belt. The best results are obtained when the grooving extends substantially along the direction of travel of the transfer belt.

Versuche haben ergeben, dass eine ausreichende Stabilität gekoppelt mit gutem Fluidspeichervolumen und gutem Fluidabfuhrvermögen bereitgestellt wird, wenn das Verhältnis von Stegbreite zu Rillenbreite zwischen 0,5 und 10 ist.Experiments have shown that sufficient stability coupled with good fluid storage volume and fluid drainage capability is provided when the land width to groove width ratio is between 0.5 and 10.

Die Rillen haben hierbei vorzugsweise eine Breite zwischen 0,2 und 10mm, bevorzugt zwischen 1 und 5mm, wobei die Tiefe der Rillen vorteilhafterweise weniger als 50% der Gesamtdicke des Transferbandes beträgt.The grooves in this case preferably have a width between 0.2 and 10 mm, preferably between 1 and 5 mm, wherein the depth of the grooves is advantageously less than 50% of the total thickness of the transfer belt.

Eine unregelmäßige Oberflächenstruktur kann bspw. dadurch bereit gestellt werden, indem der Abstand und / oder die Querschnittsfläche und / oder die Form zumindest zweier benachbarter Rillen unterschiedlich ist.An irregular surface structure can be provided, for example, by the spacing and / or the cross-sectional area and / or the shape of at least two adjacent grooves being different.

Versuche haben gezeigt, dass ein für viele Anwendungen, insbesondere bei vorheriger Beschaberung des Endlosbandes, ausreichendes Fluidspeichervolumen bereit gestellt wird, wenn die Oberflächenstruktur eine Rauhigkeit Ra der Unterseite von 3 bis 40µm umfasst. Hierbei kann die Oberflächenstruktur allein durch die Rauhigkeit gebildet werden oder aber die Rauhigkeit ist Teil der Oberflächenstruktur. Die oben beschriebene Rauhigkeit kann bspw. durch Anschleifen der Unterseite oder durch Verwendung eines entsprechend körnigen Materials zur Herstellung der Unterseite erreicht werden.Experiments have shown that a sufficient fluid storage volume is provided for many applications, in particular with previous Beschaberung of the endless belt, when the surface structure comprises a roughness Ra of the bottom of 3 to 40 .mu.m. In this case, the surface structure can be formed solely by the roughness or the roughness is part of the surface structure. The roughness described above can be achieved, for example, by sanding the underside or by using a correspondingly granular material for the production of the underside.

Vorzugsweise wird die Unterseite durch eine permeable oder impermeable polymere Schicht gebildet, wobei die Oberflächenstruktur bei der Herstellung der polymeren Schicht und / oder nach der Herstellung der polymeren Schicht erzeugt wird.Preferably, the underside is formed by a permeable or impermeable polymeric layer, wherein the surface structure is produced in the preparation of the polymeric layer and / or after the preparation of the polymeric layer.

Die Oberflächenstruktur kann bspw. bei der Herstellung der polymeren Schicht durch Gießen oder Formen erzeugt werden. Des weiteren kann die Oberflächenstruktur nach der Herstellung der polymeren Schicht durch mechanische und / oder thermische und / oder chemische Bearbeitung der polymeren Schicht erzeugt werden.For example, the surface structure may be formed by casting or molding in the preparation of the polymeric layer. Furthermore, the surface structure after the preparation of the polymeric layer can be produced by mechanical and / or thermal and / or chemical processing of the polymeric layer.

Versuche haben gezeigt, dass der Aquaplaningeffekt, insbesondere bei Verwendung des Endlosbandes in einer Pressenanordnung, dann besonders verringert werden kann, wenn das Speichervolumen zwischen 5 und 1000 Milliliter pro m2 Fläche der Unterseite, bevorzugt zwischen 50 und 500 Milliliter pro m2 Fläche der Unterseite beträgt.Experiments have shown that the aquaplaning effect, especially when using the endless belt in a press arrangement, it can be especially reduced when the storage volume of between 5 and 1000 milliliters per m 2 surface of the base, preferably between 50 and 500 milliliters per m 2 surface of the bottom is.

Die Erfindung soll im weiteren anhand der nachfolgenden schematischen Zeichnungen näher erläutert werden. Es zeigen:

Fig. 1
eine erfindungsgemäße Maschine mit einer Zentralwalzenpresse,
Fig. 2
ein erfindungsgemäßes Endlosband in Draufsicht,
Fig. 3
verschiedene Varianten von Rillungen für erfindungsgemäße Endlosbänder oder Walzenmäntel im Querschnitt,
Fig. 4
verschiedene Varianten von Oberflächenstrukturen für erfindungsgemäße Endlosbänder oder Walzenmäntel in Draufsicht auf die Unterseite bzw. auf die Mantelfläche.
The invention will be explained in more detail below with reference to the following schematic drawings. Show it:
Fig. 1
a machine according to the invention with a central roller press,
Fig. 2
an inventive endless belt in plan view,
Fig. 3
various variants of creases for endless belts according to the invention or roll casings in cross-section,
Fig. 4
Various variants of surface structures for endless belts according to the invention or roll shells in plan view of the underside or on the lateral surface.

Die Figur 1 zeigt eine erfindungsgemäße Maschine 1 mit einer Zentralwalzenpresse 2. Die Zentralwalzenpresse 2 umfasst eine Walze 3, auch Zentralwalze 3 genannt. Die Zentralwalze 3 hat eine glatte Mantelfläche 4.The FIG. 1 shows a machine 1 according to the invention with a central roller press 2. The central roller press 2 comprises a roller 3, also called central roller 3. The central roller 3 has a smooth lateral surface 4.

Der Zentralwalze 3 sind zwei Gegenwalzen 5 und 6 zugeordnet, die jeweils mit der Zentralwalze 3 einen Pressnip 7 und 8 bilden. Die Zentralwalze 3 ist des weiteren von einem Transferband 9 derart abschnittweise umschlungen, dass das Transferband 9 durch die beiden Pressnips 7 und 8 geführt wird.The central roller 3 are associated with two counter-rollers 5 and 6, which each form a press nip 7 and 8 with the central roller 3. The central roller 3 is further wrapped by a transfer belt 9 in sections such that the transfer belt 9 is guided by the two press nips 7 and 8.

Das Transferband 9 hat eine Oberseite 11, die mit einer Faserstoffbahn 10 in Kontakt bringbar ist, sowie eine Unterseite 12, die die Mantelfläche 4 der Walze 3 im gesamten Umschlingungsbereich kontaktiert.The transfer belt 9 has an upper side 11, which can be brought into contact with a fibrous web 10, and a lower side 12, which contacts the lateral surface 4 of the roller 3 in the entire wrapping area.

Die Faserstoffbahn 10 und das Transferband 9 werden zusammen durch die beiden Pressnips 7 und 8 geführt, wobei das Transferband 9 mit der Walze 3 im Kontakt ist.The fibrous web 10 and the transfer belt 9 are guided together through the two press nips 7 and 8, wherein the transfer belt 9 is in contact with the roller 3.

In der vorliegenden Ausführungsform wird durch eine Oberflächenstruktur der Unterseite 12 ein Speichervolumen bereitstellt, welches geeignet ist Wasser und / oder Luft, das in den Umschlingungsbereich zwischen Unterseite 12 und Mantelfläche 4 eindringt, zumindest teilweise aufzunehmen.In the present embodiment, a storage structure is provided by a surface structure of the underside 12, which is suitable to at least partially accommodate water and / or air, which penetrates into the wrap between the bottom 12 and lateral surface 4.

Bei dem vorliegenden Ausführungsbeispiel wird die Unterseite 12 des Transferbandes 9 durch eine polymere Schicht, wie bspw. Polyurethan, gebildet, wobei die Oberflächenstruktur durch eine Rillung mit Rillen 15, diese bilden Vertiefungen in der Unterseite 12, und dazwischen angeordneten Stegen 16 gebildet wird, die bei der Herstellung der Unterseite 12, bspw. durch Gießen, erzeugt werden (siehe Figur 2).In the present embodiment, the underside 12 of the transfer belt 9 is formed by a polymeric layer, such as polyurethane, wherein the surface structure is formed by a groove with grooves 15, which form recesses in the bottom 12, and interposed webs 16, the in the production of the bottom 12, for example by casting, are generated (see FIG. 2 ).

Die Rillen 15 erstrecken sich hierbei im wesentlichen längs zur Laufrichtung (MD-Richtung) des Endlosbandes 9, wodurch Fluid beim Durchgang durch einen Pressnip aus dem Pressnip aufgenommen und weggeführt werden kann. Die Unterseite 12 ist hierbei derart ausgebildet, dass das Speichervolumen bei Druckbelastung in einem Pressnip im wesentlichen erhalten bleibt.The grooves 15 extend in this case substantially along the direction of travel (MD direction) of the endless belt 9, whereby fluid can be taken during the passage through a press nip from the press nip and led away. The underside 12 is in this case designed such that the storage volume is maintained under pressure in a press nip substantially.

Das Verhältnis von Stegbreite zu Rillenbreite ist zwei, wobei die Rillen eine Breite von 3mm haben. Durch die Oberflächenstruktur der Unterseite 12 wird ein Speichervolumen von 400 Milliliter pro m2 Fläche der Unterseite 12 bereitgestellt.The ratio of land width to groove width is two, with the grooves having a width of 3mm. Due to the surface structure of the bottom 12, a storage volume of 400 milliliters per m 2 area of the bottom 12 is provided.

Des weiteren ist der Unterseite 12 des Endlosbandes 9 außerhalb des Umschlingungsbereichs ein Schaber 13 zum Abstreifen von Fluid sowie ein Spritzrohr 14 zur Reinigung der Unterseite 12 zugeordnet.Furthermore, the underside 12 of the endless belt 9 is outside the wrap area a scraper 13 for stripping fluid and a spray tube 14 for cleaning the bottom 12 assigned.

Bei dem Schaber 13 handelt es sich um einen weichen Schaber Kunststoffschaber ohne Faserverstärkung. Der Anstellwinkel des Schabers 13 beträgt relativ zur Unterseite 12 ca. 10°.The scraper 13 is a soft scraper plastic scraper without fiber reinforcement. The angle of attack of the scraper 13 is approximately 10 ° relative to the bottom 12.

Darüber hinaus sind der Mantelfläche 4 der Walze 3 außerhalb des Umschlingungsbereichs Schaber 17 und 18 zum Abstreifen von Fluid sowie Spritzrohre 19 und 20 zur Reinigung der Mantelfläche 4 zugeordnet.In addition, the lateral surface 4 of the roller 3 outside of the belt area scraper 17 and 18 for stripping fluid and spray tubes 19 and 20 for cleaning the lateral surface 4 are assigned.

Bevor die Faserstoffbahn 10 durch die Zentralwalzenpresse 2 läuft, durchläuft diese zwischen zwei Pressfilzen 23 und 24 einen zwischen der Gegenwalze 5 und einer anderen Walze 21 gebildeten Pressnip 22, wobei das Pressfilz 23 auch durch den zwischen Zentralwalze 3 und Gegenwalze 5 gebildeten Pressnip 7 geführt wird, so dass die Faserstoff 10 beim Durchgang durch den Pressnip 7 auf seiner einen Seite das Pressfilz 23 und auf seiner anderen Seite das Transferband 9 kontaktiert.Before the fibrous web 10 passes through the central roll press 2, it passes between two press felts 23 and 24 between the counter roll 5 and another roll 21 formed press nip 22, wherein the press felt 23 is also guided by the formed between the central roll 3 and counter roll 5 Press nip 7 so that the pulp 10 contacts the press felt 23 on its one side and the transfer belt 9 on its other side when passing through the press nip 7.

Beim Durchgang durch den zwischen Zentralwalze 3 und Gegenwalze 6 gebildeten Pressnip 8 kontaktiert die Faserstoff 10 des weiteren auf seiner einen Seite ein Pressfilz 25 und auf seiner anderen Seite das Transferband 9.During the passage through the press nip 8 formed between the central roll 3 and the counter roll 6, the fiber material 10 also contacts on its one side a press felt 25 and on its other side the transfer belt 9.

Nach dem Durchlauf der Faserstoffbahn 10 durch die Zentralwalzenpresse2, wird die Faserstoffbahn 2 von dem Transferband 9 mittels einer besaugten Pick-Up Walze 26 abgenommen und auf eine Bespannung 27 transferiert.After passing through the fibrous web 10 through the Zentralwalzenpresse2, the fibrous web 2 is removed from the transfer belt 9 by means of an evacuated pick-up roller 26 and transferred to a clothing 27.

Die Fig. 3 zeigt verschiedene Varianten von Rillungen für erfindungsgemäße Endlosbänder oder Walzenmäntel im Querschnitt.The Fig. 3 shows various variants of grooves for endless belts according to the invention or roll shells in cross section.

Bei der Darstellung der Figur 3a haben die Rillen 15 einen halbkreisförmigen Querschnitt.In the presentation of FIG. 3a the grooves 15 have a semicircular cross-section.

Bei der Darstellung der Figur 3b haben die Rillen 15 einen trapezförmigen Querschnitt.In the presentation of FIG. 3b the grooves 15 have a trapezoidal cross-section.

Bei der Darstellung der Figur 3c haben die Rillen 15 einen dreieckförmigen Querschnitt.In the presentation of Figure 3c the grooves 15 have a triangular cross-section.

Die Fig. 4 zeigt verschiedene Varianten von Oberflächenstrukturen für erfindungsgemäße Endlosbänder oder Walzenmäntel in Draufsicht auf die Unterseite 12 bzw. auf die Mantelfläche 4.The Fig. 4 shows different variants of surface structures for endless belts according to the invention or roller shells in a plan view of the underside 12 or on the lateral surface 4.

Bei der Darstellung der Figur 4a weist die Oberflächenstruktur unregelmäßig ausgebildete und Vertiefungen bildende Rillen 15 auf.In the presentation of FIG. 4a For example, the surface structure has irregularly formed recesses 15 forming recesses.

Bei der Darstellung der Figur 4b weist die Oberflächenstruktur sich diagonal zur Laufrichtung (MD-Richtung) erstreckende und Vertiefungen bildende Rillen 15 auf.In the presentation of FIG. 4b The surface structure has grooves 15 which extend diagonally to the running direction (MD direction) and form recesses.

Bei der Darstellung der Figur 4c weist die Oberflächenstruktur rautenförmige Erhöhungen 28 auf.In the presentation of Figure 4c the surface structure has diamond-shaped elevations 28.

Claims (16)

  1. Transfer belt (9) for a machine (1) for producing a material web (10), in particular a paper web, card web or tissue web, having an upper side (11) and a lower side (12), which is arranged opposite said upper side (11), wherein, in the intended use of the transfer belt (9), the upper side (11) can be brought into contact with the material web (10) and the lower side (12) can be brought into contact with the sleeve face (4) of a roller (3), and the transfer belt (9) has a storage volume for receiving fluid, such as water and/or air, which acts on the lower side (12), and wherein the storage volume is at least in part provided by the surface structure of the lower side (12), wherein the transfer belt (9) comprises an impermeable polymer layer,
    characterized in that
    the lower side (12) is formed by the impermeable polymer layer.
  2. Transfer belt according to Claim 1, characterized in that
    the lower side (12) is configured in such a manner that, in the case of pressure loading in a pressure nip (7, 8), the storage volume is substantially retained.
  3. Transfer belt according to one of the preceding claims,
    characterized in that
    the lower side (12) is configured in such a manner that, when passing through a pressure nip (7, 8), fluid is guided away from the pressure nip (7, 8).
  4. Transfer belt according to one of the preceding claims,
    characterized in that
    the transfer belt (9) has a storage volume which changes in a transverse manner to the running direction.
  5. Transfer belt according to one of the preceding claims,
    characterized in that
    the surface structure comprises a groove structure (15).
  6. Transfer belt according to Claim 5, characterized in that
    the groove structure (15) extends substantially longitudinally to the running direction of the transfer belt (9).
  7. Transfer belt according to Claim 5 or 6, characterized in that
    the ratio of web width (16) to groove width (15) is between 0.5 and 10.
  8. Transfer belt according to one of Claims 5 to 7, characterized in that
    the grooves (15) have a width between 0.2 and 10 mm, preferably between 1 and 5 mm.
  9. Transfer belt according to one of Claims 5 to 8, characterized in that
    the depth of the grooves (15) is less than 50% of the total thickness of the transfer belt (9).
  10. Transfer belt according to one of Claims 5 to 9, characterized in that
    the distance between and/or the cross-sectional area and/or the shape of at least two adjacent grooves (15) is/are different.
  11. Transfer belt according to one of Claims 1 to 10, characterized in that
    the surface structure comprises a roughness Ra of the lower side (12) of 3 to 40 µm.
  12. Transfer belt according to one of Claims 1 to 11, characterized in that
    the surface structure is created by casting or moulding during production of the polymer layer.
  13. Transfer belt according to one of Claims 1 to 11, characterized in that
    the surface structure is created after production of the polymer layer by mechanical and/or thermal and/or chemical processing of said polymer layer.
  14. Transfer belt according to one of Claims 1 to 13, characterized in that
    the storage volume is provided at least in part by an at least partially porous structure of the transfer belt (9).
  15. Transfer belt according to Claim 14, characterized in that
    the porous structure comprises a foamed structure.
  16. Transfer belt according to one of Claims 1 to 15, characterized in that
    the storage volume is between 5 and 1000 millilitres per m2 of area of the lower side, preferably between 50 and 500 millilitres per m2 of area of the lower side (12).
EP20060117369 2005-08-19 2006-07-18 Transfer belt Active EP1754823B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11159704.3A EP2360314B1 (en) 2005-08-19 2006-07-18 Transfer belt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510039301 DE102005039301A1 (en) 2005-08-19 2005-08-19 transfer tape

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP11159704.3A Division EP2360314B1 (en) 2005-08-19 2006-07-18 Transfer belt
EP11159704.3A Division-Into EP2360314B1 (en) 2005-08-19 2006-07-18 Transfer belt

Publications (3)

Publication Number Publication Date
EP1754823A2 EP1754823A2 (en) 2007-02-21
EP1754823A3 EP1754823A3 (en) 2008-08-27
EP1754823B1 true EP1754823B1 (en) 2014-03-26

Family

ID=37460043

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EP20060117369 Active EP1754823B1 (en) 2005-08-19 2006-07-18 Transfer belt
EP11159704.3A Active EP2360314B1 (en) 2005-08-19 2006-07-18 Transfer belt

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11159704.3A Active EP2360314B1 (en) 2005-08-19 2006-07-18 Transfer belt

Country Status (3)

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US (1) US7722741B2 (en)
EP (2) EP1754823B1 (en)
DE (1) DE102005039301A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006024343A1 (en) * 2006-05-24 2007-11-29 Voith Patent Gmbh Conveyor belt for machine for producing sheet materials, e.g. paper or cardboard, has indentations on machine side of belt to ensure reliable, non-slip contact with driving rollers
JP5044301B2 (en) * 2007-06-25 2012-10-10 イチカワ株式会社 Shoe press belt for papermaking machine and manufacturing method thereof
DE102008041245A1 (en) 2008-08-13 2010-02-18 Voith Patent Gmbh Transferring or processing belt for machine for manufacturing or processing fibrous material containing web material, comprises load-carrying base structure and impermeable polymer coating is embedded in sections on base structure
DE102011080728A1 (en) 2011-08-10 2013-02-14 Voith Patent Gmbh Press belt for shoe press device
JP5090566B1 (en) 2011-10-12 2012-12-05 イチカワ株式会社 Wet paper transport belt
US8738207B2 (en) * 2012-04-30 2014-05-27 GM Global Technology Operations LLC Hybrid vehicle with electric transmission and electric drive module
AT16404U1 (en) * 2017-05-18 2019-08-15 Voith Patent Gmbh Device for cleaning a circumferential covering of a machine for producing or treating a fibrous web

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Publication number Priority date Publication date Assignee Title
DE1155972B (en) * 1958-11-07 1963-10-17 Kuesters Eduard Wet press for paper, cardboard u. Like. Machines with endless followers
CS198481B1 (en) * 1977-05-20 1980-06-30 Cestmir Balcar Multilayer felt,method of and apparatus for manufacturing same
FI75620C (en) * 1982-04-01 1988-07-11 Tampella Oy Ab LAONGZONSPRESS FOER EN PAPPERSMASKIN.
US4842905A (en) * 1988-02-03 1989-06-27 Asten Group, Inc. Tessellated papermakers fabric and elements for producing the same
FI916026A (en) * 1991-12-19 1993-06-20 Valmet Paper Machinery Inc KOMPAKT PRESSPARTI MED SLUTET BANDRAG I EN PAPPERSMASKIN
DE4202731C2 (en) * 1992-01-31 1997-04-17 Voith Gmbh J M Press jacket for a shoe press
US5298124A (en) * 1992-06-11 1994-03-29 Albany International Corp. Transfer belt in a press nip closed draw transfer
DE19957617A1 (en) * 1999-11-30 2001-05-31 Voith Paper Patent Gmbh Molding continuous plastic band with elevated stud structures for e.g. paper dewatering duty, employs molding band to cast or press studs and insert rigid pegs
DE10055708A1 (en) * 2000-11-10 2002-05-16 Voith Paper Patent Gmbh Assembly for the extraction of water from a wet paper web has a rotating press surface with grooves, and an air flow through the groove recesses to strip away surface water to set the web moisture content profile
US6726809B2 (en) * 2001-09-26 2004-04-27 Albany International Corp. Industrial process fabric
US7166196B1 (en) * 2002-12-31 2007-01-23 Albany International Corp. Method for manufacturing resin-impregnated endless belt structures for papermaking machines and similar industrial applications and belt
DE10330966A1 (en) * 2003-07-08 2005-01-27 Voith Paper Patent Gmbh Pressing device in a press section of a machine for producing a fibrous web

Also Published As

Publication number Publication date
EP2360314A2 (en) 2011-08-24
EP2360314B1 (en) 2021-04-14
EP2360314A3 (en) 2012-04-18
EP1754823A3 (en) 2008-08-27
US20070042851A1 (en) 2007-02-22
US7722741B2 (en) 2010-05-25
EP1754823A2 (en) 2007-02-21
DE102005039301A1 (en) 2007-02-22

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