EP1778915B1 - Device for stabilising a web - Google Patents

Device for stabilising a web Download PDF

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Publication number
EP1778915B1
EP1778915B1 EP05761171A EP05761171A EP1778915B1 EP 1778915 B1 EP1778915 B1 EP 1778915B1 EP 05761171 A EP05761171 A EP 05761171A EP 05761171 A EP05761171 A EP 05761171A EP 1778915 B1 EP1778915 B1 EP 1778915B1
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EP
European Patent Office
Prior art keywords
fabric
transfer apparatus
underside
pressure zone
negative pressure
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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.)
Not-in-force
Application number
EP05761171A
Other languages
German (de)
French (fr)
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EP1778915A1 (en
Inventor
Thomas Scherb
Luiz Carlos Silva
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
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Publication of EP1778915A1 publication Critical patent/EP1778915A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/10—Advancing webs by a feed band against which web is held by fluid pressure, e.g. suction or air blast
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/26—Mechanisms for controlling contact pressure on winding-web package, e.g. for regulating the quantity of air between web layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/2207—Changing the web roll in winding mechanisms or in connection with winding operations the web roll being driven by a winding mechanism of the centre or core drive type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/31—Suction box; Suction chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/32—Suction belts

Definitions

  • This invention relates to a transfer device with a device for stabilizing the transport of a material web guided on the upper side of a clothing, in particular a fibrous web, according to the preamble of patent claim 1.
  • the document DE19613939 A1 describes a device for stabilizing a paper web in a paper machine in the region of a roller, to which the paper web is guided on a belt, with a front of the roller along the belt extending box whose interior is open to the paper web and in which a negative pressure is generated for sucking the paper web to the tape.
  • a pressure zone can follow the negative pressure zone, which supports the transfer of the paper web to the roll.
  • the document EP1205415 A2 relates to a vacuum belt conveyor apparatus having an air-permeable, endless belt which is guided by a first roller arranged at the upstream end of the conveyor device and a second roller arranged at the downstream end of the conveyor device.
  • the endless belt has a transporting run that runs from the first to the second roll and a returning run that runs from the second to the first roll.
  • the transporting Trumm is in contact with a plate with openings, which are connectable to a vacuum source.
  • the document US4893741 refers to an air duct for stabilizing a running web, such.
  • the transfer device with a device for transport stabilization of a run on the top of an air-permeable fabric web-like material, in particular a fibrous web.
  • the device is arranged on the underside of the clothing and in the web running direction immediately before an inlet gap formed by a roller and the clothing and has a first vacuum zone and at least one pointing substantially against the web running direction and communicating with the first vacuum zone of the device suction opening.
  • the air boundary layer entrained from the underside of the clothing is at least partially drawn from the clothing directly through the suction opening into the first vacuum zone.
  • a suction opening is provided, which extends in the transverse direction, in particular substantially over the air-permeable width of the fabric.
  • a guide element which is arranged in such a way that the air boundary layer entrained from the underside of the clothing is at least partially guided by the clothing to the suction opening.
  • the guide element is arranged in the web running direction in front of the first vacuum zone.
  • the guide element preferably has a guide surface.
  • the guide surface of the guide element has at one end against the web running obliquely in the direction of the underside of the fabric and the other end in the direction of the facing against the web running suction port. This makes it particularly effective possible to peel off the air boundary layer of the fabric and supply the suction port.
  • the routing of the air boundary layer is further optimized by the fact that in the direction of the underside of the fabric facing end of the guide surface is located in the immediate vicinity of the underside of the fabric, so that the distance between the end and the underside of the fabric is as low as possible and thus only a small Part of the air boundary layer in the gap between the fabric and the end "escape" can.
  • the guide element To improve the mode of action of the guide element also contributes, when the guide element in the region of the underside of the fabric facing end of the guide surface is pointed in its cross-section tapered tapering for covering. As a result, the "peeled-off" air boundary layer can be led away from the clothing as swirl-free as possible and without pressure build-up.
  • the guide element extends in the transverse direction of the fabric, in particular substantially over the air-permeable width of the fabric.
  • the guide element is inexpensive as a guide plate, for example. By a forming process or the like. Produced.
  • the device has at least one suction opening pointing substantially counter to the web running direction and communicating with the first vacuum zone of the device.
  • the suction opening in this case, is arranged in the web running direction behind the guide element and points against the web running direction in the direction of flow of the "peeled" air layer, so that the "peeled off” of the guide element air boundary layer can pass directly through the suction port into the first vacuum zone.
  • the device In order to prevent a new air boundary layer builds up after an air boundary layer has been peeled off by the interaction of the guide element and the first vacuum zone from the underside of the fabric, it may be useful if the device at least one pointing substantially in the direction of the underside of the fabric and with Having the first negative pressure zone of the device communicating suction port.
  • the pointing to the underside of the fabric suction opening is in this case arranged in the web running direction behind the guide element.
  • the second vacuum zone is evacuated by a suction device independent of the first vacuum zone, or else that the first and second negative pressure zones are evacuated by a common suction device.
  • first vacuum zone may extend to the inlet gap.
  • first and the second negative pressure zone coincide.
  • a further embodiment of the invention provides that a doctor blade acting on the roller is arranged directly in front of the inlet gap in such a way that Roller entrained air boundary layer is led away from the roller.
  • a web lifting is prevented particularly effectively if the first and / or the second vacuum zone is formed in the region between the inlet gap, doctor blade and the device.
  • the device according to the invention can be used wherever the danger of web lift caused by air boundary layer overpressure in the region of the inlet gap. This is especially at high web speeds (eg more than 800 meters / min or especially more than 1100 meters / min) or long free transport distances of the fabric without support by a roller (here can build on the long free transport route an air boundary layer) or at Use of voluminous and / or structured coverings such as tapes or embossing tapes or felts or embossing felts or membranes, in particular Spectra membrane or TAD (through-air dryer) tapes or when transporting thin and light fibrous webs such as tissue webs.
  • TAD through-air dryer
  • the device according to the invention is therefore preferably used in a transfer device which, for example, is arranged between a drying device, in particular a Yankee drying cylinder, and a take-up device of a paper machine, in particular a tissue machine.
  • FIG. 1 shows a part of a tissue machine 1 in side view.
  • the illustrated part shows a section of a Yankoe drying cylinder 2 of a drying device, a winding device 3, a spool 4 and a roller formed as a winding drum 5, and a transfer device 6, pulleys 7, 8, 9, the winding drum 5, as a TAD Sieve 10 formed fabric and the inventive device for transport stabilization 11 comprising.
  • a tissue paper web 12 is removed from the Yankee drying cylinder 2 by means of a creping doctor 13.
  • the thus creped tissue paper web 12 is then transferred by means of a suction box 16 to the TAD screen 10 and transported on the top 14 of the TAD sieve 10 to the winding device 3, then conveyed by a formed between the spool 4 and the winding drum 5 gap 35 and finally wound up on the reel 4.
  • the device 11 has, in the present embodiment, a first suction box 15, a second suction box 29 and a third suction box 30.
  • the first suction box 15 is arranged in the web running direction 17 of the tissue web 12 immediately before an inlet gap 18 formed by the TAD wire 10 and the winding drum 5.
  • the first suction box 15 generates a first vacuum zone 19.
  • the suction box 15 has a plurality of suction openings 20 arranged one behind the other in the transverse direction of the TAD wire 10 and facing the web running direction and communicating with the first vacuum zone 19 (see FIG FIG. 2 ).
  • a guide element extending in the transverse direction of the wire 10 and designed as a guide plate 21 is arranged in the web running direction 17 in front of the suction openings 20 and thus in front of the first vacuum zone 19.
  • the guide plate 21 extends in this case in the transverse direction substantially over the air-permeable width of the screen 10.
  • the guide element has a guide surface 33.
  • An end 24 of the guide surface 33 points against the web running direction 17 in the direction of the bottom 22 of the TAD sieve 10 and the other end 34 of the guide surface 33 points in the direction of the suction openings 20.
  • the guide element 21 is formed tapering in cross section to the wire 10.
  • the removal of the air boundary layer 23 from the underside 22 of the TAD sieve 10 is thereby optimized when the pointing in the direction of the bottom 22 of the wire 10 end 24 of the guide surface 33 in close proximity (here: in temporary contact) to the bottom 22 of the wire 10th is arranged so that the distance between the end 24 and the bottom 22 of the wire 10 is as small as possible and thus only a small proportion of the air boundary layer 23 in the gap between the wire 10 and end 24 "escape" can.
  • the suction box 15 has a suction opening 25 extending in the transverse direction of the wire 10 and pointing in the direction of the underside 22 of the wire 10 and communicating with the first vacuum zone 19.
  • the suction opening 25 is in this case arranged in the web running direction 17 behind the baffle 21.
  • the area in which the suction openings 20 and 25 are arranged extends in FIG substantially across the air-permeable width of the TAD mesh 10.
  • the second suction box 29 is arranged, which generates a second negative pressure zone 26.
  • the second vacuum zone 26 extends substantially to the inlet gap 18 and up to a scraper blade 27 acting on the winding drum 5.
  • the first negative pressure zone 19 and the second negative pressure zone 26 are each separately evacuated.
  • the third suction box 30 is arranged in the web running direction 17 in front of the baffle 21, which generates a third on the bottom 22 of the screen 10 acting vacuum zone 31.
  • the third negative pressure zone 31 acts on the underside 22 of the screen 10 via a suction opening 32 communicating with it.
  • FIG. 2 shows a section detail detail of the device 11 according to the invention can be seen is a part of the first suction box 15, through which a first negative pressure zone 19 is formed.
  • the suction box 15 has facing the web running direction 17 suction openings 20 and in the direction of the bottom 22 of the wire 10 facing suction openings 25, which communicate with the first vacuum zone 19.
  • the guide element 21 is in the region of the bottom 22 of the screen 10 facing end 24 of the guide surface 33 in cross-section pointed to the bottom 22 formed tapered and seconded to the bottom 22 immediately adjacent.
  • the entrained with the sieve 10 air boundary layer 23 is peeled off by the pointed formation of the baffle 21 in the region of the end 24 of the guide surface of the bottom 22 of the wire 10 and led away through the guide plate 21 and directed into the suction port 20 into the first vacuum zone 19.
  • FIG. 3 shows the device 11 in section line AA.
  • the first suction box 15 can be seen with the suction openings 20 facing the web running direction 17 and the suction openings 25 pointing in the direction of the underside 22 of the wire.
  • the suction openings 20 and 25 are arranged one behind the other in the transverse extent of the screen 10, their arrangement extending substantially to the air-permeable width of the TAD screen 10 (the screen 10 is permeable to air over its entire width in the illustrated embodiment).
  • FIG. 4 shows the device 11 in section BB.
  • the third suction box 30 can be seen with the suction opening 32 extending in the direction of the underside 22 of the wire 10 and extending in the transverse direction of the wire 10.
  • the suction openings 32 are arranged one behind the other in the transverse extent of the screen 10, their arrangement extending substantially to the air-permeable width of the TAD screen 10 (the screen 10 is permeable to air over its entire width in the illustrated embodiment).

Abstract

The invention relates to a device (11) for stabilising the transport of a material web (12) on the upper face of an air-permeable machine clothing (10), in particular a fibrous web. The device is located on the underside of the machine clothing directly upstream of an intake nip in the direction of travel (17) of the web, said nip being formed by a roll (5) and the machine clothing, and comprises a first negative-pressure zone (19) and at least one vacuum opening (20) that faces essentially in the opposite direction to the direction of travel of the web, communicating with the first negative-pressure zone of the device. This permits the boundary layer (23) of air that is carried along by the underside of the machine clothing to be at least partially sucked from said clothing into the first negative-pressure zone.

Description

Diese Erfindung betrifft eine Transfereinrichtung mit einer Vorrichtung zur Stabilisierung des Transports einer auf der Oberseite einer Bespannung geführten Materialbahn, insbesondere eine Faserstoffbahn, nach dem Oberbegriff des Patentanspruchs 1.This invention relates to a transfer device with a device for stabilizing the transport of a material web guided on the upper side of a clothing, in particular a fibrous web, according to the preamble of patent claim 1.

Das Dokument DE19613939 A1 beschreibt eine Vorrichtung zur Stabilisierung einer Papierbahn in einer Papiermaschine im Bereich einer Walze, bis zu der die Papierbahn auf einem Band gefuehrt ist, mit einem sich vor der Walze entlang des Bandes erstreckenden Kasten, dessen Innenraum zur Papierbahn hin offen ist und in dem ein Unterdruck zur Ansaugung der Papierbahn an das Band erzeugt wird. Innerhalb des Kastens kann sich an die Unterdruckzone in Bahnlaufrichtung gesehen eine Druckzone anschließen, durch die die Übergabe der Papierbahn auf die Walze unterstützt wird.The document DE19613939 A1 describes a device for stabilizing a paper web in a paper machine in the region of a roller, to which the paper web is guided on a belt, with a front of the roller along the belt extending box whose interior is open to the paper web and in which a negative pressure is generated for sucking the paper web to the tape. Within the box, as seen in the web running direction, a pressure zone can follow the negative pressure zone, which supports the transfer of the paper web to the roll.

Das Dokument EP1205415 A2 betrifft eine Vakuum-Bandfoerdervorrichtung mit einem luftdurchlaessigen, endlosen Band, das durch eine am stromaufwaertigen Ende der Foerdervorrichtung angeordnete erste Rolle und einer am stromabwaertigen Ende der Foerdervorrichtung angeordne zweite Rolle geführt wird. Das endlose Band hat ein transportierendes Trumm, welches von der ersten zur zweiten Rolle laeuft und ein zuruecklaufendes Trumm, welches von der zweiten zur ersten Rolle laeuft. Das transportierende Trumm ist in Kontakt mit einer Platte mit Oeffnungen, die an eine Unterdruckquelle anschliessbar sind.The document EP1205415 A2 relates to a vacuum belt conveyor apparatus having an air-permeable, endless belt which is guided by a first roller arranged at the upstream end of the conveyor device and a second roller arranged at the downstream end of the conveyor device. The endless belt has a transporting run that runs from the first to the second roll and a returning run that runs from the second to the first roll. The transporting Trumm is in contact with a plate with openings, which are connectable to a vacuum source.

Das Dokument US4893741 bezieht sich auf einen Luftleitkasten zum Stabilisieren einer laufenden Warenbahn, wie z. B. einer Papierbahn, der sich quer zur Laufrichtung der Warenbahn zumindest ueber einen Teil der Breite der Warenbahn erstreckt, und der eine sogenannte Leitwand aufweist, die sich - im Querschnitt gesehen - entlang dem Laufweg der Warenbahn erstreckt, wobei zwischen der Leitwand und der Warenbahn ein Luftspalt verbleibt, und wobei eine Einrichtung zur Beeinflussung der im Luftspalt befindlichen Luft mittels eines Treibstrahls vorgesehen ist.The document US4893741 refers to an air duct for stabilizing a running web, such. B. a paper web extending transversely to the direction of the web at least over a portion of the width of the web, and having a so-called baffle extending - seen in cross section - along the path of the web, wherein between the baffle and the web an air gap remains, and wherein means for influencing the air in the air gap is provided by means of a propulsion jet.

Insbesondere bei hohen Bahngeschwindigkeiten und bei strukturierten Bespannungen mit rauer und grober Oberseite sowie bei dünnen und leichten Faserstoffbahnen, wie bspw. Tissuebahnen, besteht die Problematik, dass die geführte Materialbahn oftmals im Bereich eines durch eine Walze und die Bespannung gebildeten Einlauftpalts von der Bespannung abgehoben wird, was die Bildung von Streifen und Falten und daraus folgend eine schlechte Wickelqualität zur Folge hat.Particularly at high web speeds and in structured coverings with rough and coarse upper side as well as thin and light fibrous webs, such as tissue webs, there is the problem that the guided material web is often lifted off the clothing in the area of an inlet gap formed by a roller and the clothing , which results in the formation of streaks and wrinkles and, consequently, poor winding quality.

Der Grund ist darin zu sehen, dass bspw. raue Siebe sehr voluminös sind und daher viel Luft, sowohl im Inneren als auch Außen in Form einer Luftgrenzschicht, tragen. Läuft eine auf einem solchen Sieb geführte Materialbahn in den durch das Sieb und eine Walze gebildeten Einlaufspalt, so wird die mit dem Sieb mitgeführte Luftgrenzschicht im Einlaufspalt aufgrund des sich verringernden Volumens komprimiert und es kommt in diesem Bereich zur Ausbildung eines Überdrucks, der sich durch das luftdurchlässige Sieb abbaut, mit der Folge der Abhebung der Materialbahn. Dieser Effekt tritt insbesondere bei leichten Materialbahnen wie Tissuebahnen auf.The reason is that, for example, rough screens are very voluminous and therefore carry a lot of air, both inside and outside in the form of an air boundary layer. If a material web guided on such a sieve runs into the inlet gap formed by the sieve and a roller, the air boundary layer entrained with the sieve is compressed in the inlet gap due to the decreasing volume and in this region an overpressure is created which runs through the permeable screen degrades, with the result of lifting the web. This effect occurs especially in light webs such as tissue webs.

Es ist die Aufgabe der vorliegenden Erfindung eine Vorrichtung zur Transportstabilisierung einer Materialbahn im Bereich eines Einlaufspalts vorzuschlagen, bei der die oben beschriebenen Probleme behoben sind.It is the object of the present invention to provide a device for transport stabilization of a material web in the region of an inlet gap, in which the problems described above are eliminated.

Die Erfindung wird gelöst durch eine Vorrichtung mit den Merkmalen des Patentanspruchs 1.The invention is solved by a device having the features of patent claim 1.

Gemäß dem Oberbegriff handelt es sich um eine Transfereinrichtung mit einer Vorrichtung zur Transportstabilisierung eines auf der Oberseite einer luftdurchlässigen Bespannung geführten bahnförmigen Gutes, insbesondere eine Faserstoffbahn. Hierbei ist die Vorrichtung an der Unterseite der Bespannung und in Bahnlaufrichtung unmittelbar vor einem durch eine Walze und die Bespannung gebildeten Einlaufspalt angeordnet und weist eine erste Unterdruckzone sowie zumindest eine im wesentlichen gegen die Bahnlaufrichtung weisende und mit der ersten Unterdruckzone der Vorrichtung kommunizierende Saugöffnung auf.According to the preamble, there is a transfer device with a device for transport stabilization of a run on the top of an air-permeable fabric web-like material, in particular a fibrous web. In this case, the device is arranged on the underside of the clothing and in the web running direction immediately before an inlet gap formed by a roller and the clothing and has a first vacuum zone and at least one pointing substantially against the web running direction and communicating with the first vacuum zone of the device suction opening.

Erfindungsgemäß ist vorgesehen, dass die von der Unterseite der Bespannung mitgeführte Luftgrenzschicht zumindest teilweise von der Bespannung direkt durch die Saugöffnung in die erste Unterdruckzone gesaugt wird.According to the invention, it is provided that the air boundary layer entrained from the underside of the clothing is at least partially drawn from the clothing directly through the suction opening into the first vacuum zone.

Somit wird durch die gegen die Bahnlaufrichtung weisende und mit der ersten Unterdruckzone kommunizierende Saugöffnung die von der Bespannung mitgeführte Luftgrenzschicht von der Bespannung in eine erste Unterdruckzone gesaugt, bevor die Luftgrenzschicht in den Einlaufspalt gelangen kann, komprimiert wird und einen Überdruck erzeugt, der sich durch die luftdurchlässige Bespannung abbaut und zum Abheben der auf der Bespannung geführten Materialbahn führt.Thus, by pointing against the direction of web travel and communicating with the first vacuum zone suction port entrained by the fabric air boundary layer of the fabric in a first vacuum zone before the air boundary layer can get into the inlet gap, is compressed and generates an overpressure, which is characterized by degrades air-permeable fabric and leads to lifting the guided on the fabric web.

Um die Luftgrenzschicht über die Breite der Bespannung, insbesondere über die luftdurchlässige Breite der Bespannung, in die erste Unterdruckzone wegführen zu können, ist es sinnvoll, wenn in Querrichtung der Bespannung, insbesondere über die luftdurchlässige Breite der Bespannung, mehrere Saugöffnungen hintereinander liegend angeordnet sind.In order to be able to lead the air boundary layer over the width of the fabric, in particular over the air-permeable width of the fabric, in the first vacuum zone, it makes sense if in the transverse direction of the fabric, in particular on the air-permeable width of the fabric, a plurality of suction openings are arranged one behind the other.

Um einen gleichen Effekt wie im oberen Abschnitt erläutert zu erzielen, kann es in manchen Anwendungsfällen auch sinnvoll sein, wenn eine Saugöffnung vorgesehen ist, die sich in Querrichtung, insbesondere im wesentlichen über die luftdurchlässige Breite der Bespannung, erstreckt.In order to achieve the same effect as explained in the upper section, it may also be useful in some applications if a suction opening is provided, which extends in the transverse direction, in particular substantially over the air-permeable width of the fabric.

Um die Wirkungsweise der gegen die Bahnlaufrichtung weisenden Saugöffnung zu erhöhen, ist es sinnvoll ein Leitelement vorzusehen, welches derart angeordnet ist, dass die von der Unterseite der Bespannung mitgeführte Luftgrenzschicht zumindest teilweise von der Bespannung zur Saugöffnung geleitet wird.In order to increase the mode of action of the suction opening facing the web running direction, it is expedient to provide a guide element which is arranged in such a way that the air boundary layer entrained from the underside of the clothing is at least partially guided by the clothing to the suction opening.

Hierbei ist das Leitelement in Bahnlaufrichtung vor der ersten Unterdruckzone angeordnet.Here, the guide element is arranged in the web running direction in front of the first vacuum zone.

Bevorzugt weist das Leitelement eine Leitfläche auf.The guide element preferably has a guide surface.

Um die mit der Bespannung mitgeführte Luftgrenzschicht möglichst effektiv und vollständig von der Bespannung wegführen zu können ist es sinnvoll, wenn die Leitfläche des Leitelements einendseitig gegen die Bahnlaufrichtung schräg in Richtung der Unterseite der Bespannung und andernendseitig in Richtung der gegen die Bahnlaufrichtung weisenden Saugöffnung weist. Damit ist es besonders effektiv möglich die Luftgrenzschicht von der Bespannung abzuschälen und der Saugöffnung zuzuführen.In order to be able to lead the air boundary layer entrained with the covering as effectively and completely as possible from the fabric, it makes sense if the guide surface of the guide element has at one end against the web running obliquely in the direction of the underside of the fabric and the other end in the direction of the facing against the web running suction port. This makes it particularly effective possible to peel off the air boundary layer of the fabric and supply the suction port.

Das Wegführen der Luftgrenzschicht wird weiter dadurch optimiert, wenn das in Richtung der Unterseite der Bespannung weisende Ende der Leitfläche in unmittelbarer Nähe der Unterseite der Bespannung angeordnet ist, sodass der Abstand zwischen dem Ende und der Unterseite der Bespannung möglichst gering ist und somit ein nur geringer Anteil der Luftgrenzschicht im Spalt zwischen Bespannung und Ende "entflüchten" kann.The routing of the air boundary layer is further optimized by the fact that in the direction of the underside of the fabric facing end of the guide surface is located in the immediate vicinity of the underside of the fabric, so that the distance between the end and the underside of the fabric is as low as possible and thus only a small Part of the air boundary layer in the gap between the fabric and the end "escape" can.

Zur Verbesserung der Wirkungsweise des Leitelements trägt auch bei, wenn das Leitelement im Bereich des zur Unterseite der Bespannung weisenden Endes der Leitfläche in seinem Querschnitt spitz zur Bespannung zulaufend ausgebildet ist. Dadurch kann die "abgeschälte" Luftgrenzschicht möglichst wirbelfrei und ohne Druckaufbau von der Bespannung weggeleitet werden.To improve the mode of action of the guide element also contributes, when the guide element in the region of the underside of the fabric facing end of the guide surface is pointed in its cross-section tapered tapering for covering. As a result, the "peeled-off" air boundary layer can be led away from the clothing as swirl-free as possible and without pressure build-up.

Zum effektiven wegleiten der Luftgrenzschicht ist es des weiteren sinnvoll, wenn sich das Leitelement in Querrichtung der Bespannung, insbesondere im wesentlichen über die luftdurchlässige Breite der Bespannung, erstreckt.For the effective conduct away the air boundary layer, it is also useful if the guide element extends in the transverse direction of the fabric, in particular substantially over the air-permeable width of the fabric.

Das Leitelement ist kostengünstig als Leitblech, bspw. durch einen Umformprozess oder dgl. herstellbar.The guide element is inexpensive as a guide plate, for example. By a forming process or the like. Produced.

Eine Möglichkeit die erfindungsgemäße Vorrichtung konstruktiv auszuführen, besteht darin, dass die Vorrichtung zumindest eine im wesentlichen gegen die Bahnlaufrichtung weisende und mit der ersten Unterdruckzone der Vorrichtung kommunizierende Saugöffnung aufweist. Die Saugöffnung, ist hierbei in Bahnlaufrichtung hinter dem Leitelement angeordnet und weist gegen die Bahnlaufrichtung in die Richtung der Strömung der "abgeschälten" Luftschicht, so dass die von dem Leitelement "abgeschälte" Luftgrenzschicht direkt über die Saugöffnung in die erste Unterdruckzone gelangen kann.One possibility for structurally implementing the device according to the invention is that the device has at least one suction opening pointing substantially counter to the web running direction and communicating with the first vacuum zone of the device. The suction opening, in this case, is arranged in the web running direction behind the guide element and points against the web running direction in the direction of flow of the "peeled" air layer, so that the "peeled off" of the guide element air boundary layer can pass directly through the suction port into the first vacuum zone.

Um zu verhindern, dass sich eine neue Luftgrenzschicht aufbaut, nachdem eine Luftgrenzschicht durch das Zusammenwirken von Leitelement und erster Unterdruckzone von der Unterseite der Bespannung abgeschält wurde kann es sinnvoll sein, wenn die Vorrichtung zumindest eine im wesentlichen in Richtung der Unterseite der Bespannung weisende und mit der ersten Unterdruckzone der Vorrichtung kommunizierende Saugöffnung aufweist. Die zur Unterseite der Bespannung weisende Saugöffnung ist hierbei in Bahnlaufrichtung hinter dem Leitelement angeordnet.In order to prevent a new air boundary layer builds up after an air boundary layer has been peeled off by the interaction of the guide element and the first vacuum zone from the underside of the fabric, it may be useful if the device at least one pointing substantially in the direction of the underside of the fabric and with Having the first negative pressure zone of the device communicating suction port. The pointing to the underside of the fabric suction opening is in this case arranged in the web running direction behind the guide element.

Um die Entstehung einer neuen Luftgrenzschicht in Quererstreckung der Bespannung zu verhindern, ist es sinnvoll, wenn in Querrichtung der Bespannung mehrere der zur Unterseite der Bespannung weisenden Saugöffnungen hintereinander liegend angeordnet sind oder wenn eine Saugöffnung vorgesehen ist, die sich in Querrichtung, insbesondere im wesentlichen über die luftdurchlässige Breite der Bespannung erstreckt.In order to prevent the formation of a new air boundary layer in transverse extent of the fabric, it makes sense if several of the suction openings pointing to the underside of the fabric are arranged one behind the other in the transverse direction of the fabric or if a suction opening is provided which extends in the transverse direction, in particular substantially over the air-permeable width of the fabric extends.

Ebenfalls kann es zur Verhinderung des Aufbaus einer neuen Luftgrenzschicht bis zum Einlaufspalt sinnvoll sein, wenn zwischen der ersten Unterdruckzone und dem Einlaufspalt eine zweite Unterdruckzone gebildet wird.It may also be useful to prevent the construction of a new air boundary layer to the inlet gap when a second negative pressure zone is formed between the first negative pressure zone and the inlet gap.

Abhängig von der konstruktiven Ausführung, kann es möglich sein, dass die zweite Unterdruckzone durch eine zur ersten Unterdruckzone unabhängige Saugvorrichtung besaugt wird oder aber dass die erste und die zweite Unterdruckzone durch eine gemeinsame Saugvorrichtung besaugt werden.Depending on the structural design, it may be possible that the second vacuum zone is evacuated by a suction device independent of the first vacuum zone, or else that the first and second negative pressure zones are evacuated by a common suction device.

Des weiteren kann es möglich sein, dass sich die erste Unterdruckzone bis zum Einlaufspalt erstreckt. In diesem Fall fallen die erste und die zweite Unterdruckzone zusammen.Furthermore, it may be possible for the first vacuum zone to extend to the inlet gap. In this case, the first and the second negative pressure zone coincide.

Um die von der Walze in den Einlaufspalt mitgeführte Luftgrenzschicht wegzuleiten und somit ebenfalls einen Überdruck mit daraus folgender Bahnabhebung verhindern zu können, sieht eine weitere Ausgestaltung der Erfindung vor, dass unmittelbar vor dem Einlaufspalt eine auf die Walze wirkende Schaberklinge derart angeordnet ist, dass von der Walze mitgeführte Luftgrenzschicht von der Walze weggeleitet wird.In order to be able to conduct away the air boundary layer entrained by the roller into the inlet gap and thus likewise to be able to prevent overpressure with consequent web lift, a further embodiment of the invention provides that a doctor blade acting on the roller is arranged directly in front of the inlet gap in such a way that Roller entrained air boundary layer is led away from the roller.

Besonders effektiv wird ein Bahnabheben verhindert, wenn die erste und / oder die zweite Unterdruckzone im Bereich zwischen Einlaufspalt, Schaberklinge und der Vorrichtung gebildet wird. Dies bedeutet, dass durch das Leitelement die Luftgrenzschicht von der Unterseite der Bespannung weggeleitet wird, dass durch die Schaberklinge die Luftgrenzschicht von der Walze weggeleitet wird und dass durch die Bildung einer Unterdruckzone (erste und / oder zweite) verhindert wird, dass sich bis zu Einlaufspalt eine neue Luftgrenzschicht an Walze und an der Unterseite der Bespannung aufbauen kann.A web lifting is prevented particularly effectively if the first and / or the second vacuum zone is formed in the region between the inlet gap, doctor blade and the device. This means that the air boundary layer is led away from the underside of the fabric by the guide element, that the air boundary layer is led away from the roller by the doctor blade and that by the formation of a negative pressure zone (first and / or second) is prevented, that can build up to inlet gap a new air boundary layer on roller and on the underside of the fabric.

Um die Bildung der Luftgrenzschicht im Vorlauf zur Vorrichtung zu reduzieren, kann es sinnvoll sein, wenn in Bahnlaufrichtung vor dem Leitelement eine dritte auf die Unterseite der Bespannung wirkende Unterdruckzone gebildet wird.In order to reduce the formation of the air boundary layer in the flow to the device, it may be useful if in the web running direction in front of the guide element, a third acting on the underside of the fabric vacuum zone is formed.

Die erfindungsgemäße Vorrichtung kann überall dort zum Einsatz kommen wo die Gefahr der Bahnabhebung durch Luftgrenzschicht erzeugten Überdruck im Bereich des Einlaufspalts besteht. Dies ist insbesondere bei hohen Bahngeschwindigkeiten (bspw. mehr als 800 Meter/min oder besonders mehr als 1100Meter/min) oder bei langen freien Transportstrecken der Bespannung ohne Unterstützung durch eine Walze (hier kann sich über die lange frei Transportstrecke eine Luftgrenzschicht aufbauen) oder bei Verwendung voluminöser und / oder strukturierter Bespannungen wie Bänder oder Prägebänder oder Filzen oder Prägefilzen oder Membranen, insbesondere Spectra-Membran oder TAD (through air dryer)-Bändern oder beim Transport dünner und leichter Faserstoffbahnen wie Tissuebahnen gegeben.The device according to the invention can be used wherever the danger of web lift caused by air boundary layer overpressure in the region of the inlet gap. This is especially at high web speeds (eg more than 800 meters / min or especially more than 1100 meters / min) or long free transport distances of the fabric without support by a roller (here can build on the long free transport route an air boundary layer) or at Use of voluminous and / or structured coverings such as tapes or embossing tapes or felts or embossing felts or membranes, in particular Spectra membrane or TAD (through-air dryer) tapes or when transporting thin and light fibrous webs such as tissue webs.

Die erfindungsgemäße Vorrichtung findet demzufolge vorzugsweise Verwendung in einer Transfereinrichtung, welche bspw. zwischen einer Trockeneinrichtung, insbesondere einem Yankee-Trockenzylinder, und einer Aufwickeleinrichtung einer Papiermaschine, insbesondere einer Tissuemaschine, angeordnet ist.The device according to the invention is therefore preferably used in a transfer device which, for example, is arranged between a drying device, in particular a Yankee drying cylinder, and a take-up device of a paper machine, in particular a tissue machine.

Die Erfindung soll anhand der folgenden nicht maßstäblichen Zeichnungen näher erläutert werden. Es zeigen:

Fig. 1
Eine Transfereinrichtung bei einer Tissuemaschine mit einer erfindungsgemäßen Vorrichtung zur Transportstabilisierung in Seitenansicht,
Fig. 2
eine abschnittweise Detailvergrößerung der erfindungsgemäßen Vorrichtung aus Fig. 1,
Fig. 3
eine Ausschnittvergrößerung eines Teils der erfindungsgemäßen Vorrichtung in Schnittrichtung A-A der Fig. 1,
Fig. 4
eine Ausschnittvergrößerung eines Teils der erfindungsgemäßen Vorrichtung in Schnittrichtung B-B der Fig. 1.
The invention will be explained in more detail with reference to the following non-scale drawings. Show it:
Fig. 1
A transfer device in a tissue machine with a device according to the invention for transport stabilization in side view,
Fig. 2
a detail detail enlargement of the device according to the invention Fig. 1 .
Fig. 3
a detail enlargement of a part of the device according to the invention in the cutting direction AA of Fig. 1 .
Fig. 4
a detail enlargement of a part of the device according to the invention in the cutting direction BB of Fig. 1 ,

Die Figur 1 zeigt einen Teil einer Tissuemaschine 1 in Seitenansicht. Der dargestellte Teil zeigt einen Abschnitt eines Yankoe-Trockenzylinders 2 einer Trockeneinrichtung, eine Wickelvorrichtung 3, einen Tambour 4 und eine als Wickeltrommel 5 ausgebildete Walze aufweisend, sowie eine Transfereinrichtung 6, Umlenkrollen 7, 8, 9, die Wickeltrommel 5, eine als TAD- Sieb 10 ausgebildete Bespannung und die erfindungsgemäße Vorrichtung zur Transportstabilisierung 11 umfassend.The FIG. 1 shows a part of a tissue machine 1 in side view. The illustrated part shows a section of a Yankoe drying cylinder 2 of a drying device, a winding device 3, a spool 4 and a roller formed as a winding drum 5, and a transfer device 6, pulleys 7, 8, 9, the winding drum 5, as a TAD Sieve 10 formed fabric and the inventive device for transport stabilization 11 comprising.

Eine Tissuepapierbahn 12 wird vom Yankee-Trockenzylinder 2 mittels eines Kreppschabers 13 abgenommen. Die so gekreppte Tissuepapierbahn 12 wird dann mit Hilfe eines Saugkastens 16 auf das TAD- Sieb 10 transferiert und auf der Oberseite 14 des TAD- Siebs 10 bis zur Wickelvorrichtung 3 transportiert, anschließend durch einem zwischen dem Tambour 4 und der Wickeltrommel 5 gebildeten Spalt 35 befördert und schließlich auf dem Tambour 4 aufgewickelt.A tissue paper web 12 is removed from the Yankee drying cylinder 2 by means of a creping doctor 13. The thus creped tissue paper web 12 is then transferred by means of a suction box 16 to the TAD screen 10 and transported on the top 14 of the TAD sieve 10 to the winding device 3, then conveyed by a formed between the spool 4 and the winding drum 5 gap 35 and finally wound up on the reel 4.

Die erfindungsgemäße Vorrichtung 11 weist in der vorliegenden Ausführungsform einen ersten Saugkasten 15, einen zweiten Saugkasten 29 und einen dritten Saugkasten 30 auf.The device 11 according to the invention has, in the present embodiment, a first suction box 15, a second suction box 29 and a third suction box 30.

Der erste Saugkasten 15 ist in Bahnlaufrichtung 17 der Tissuebahn 12 unmittelbar vor einem durch das TAD- Sieb 10 und der Wickeltrommel 5 gebildeten Einlaufspalt 18 angeordnet. Der erste Saugkasten 15 erzeugt eine erste Unterdruckzone 19.The first suction box 15 is arranged in the web running direction 17 of the tissue web 12 immediately before an inlet gap 18 formed by the TAD wire 10 and the winding drum 5. The first suction box 15 generates a first vacuum zone 19.

Der Saugkasten 15 weist mehrere in Querrichtung des TAD- Siebs 10 hintereinander liegend angeordnete und gegen die Bahnlaufrichtung weisende und mit der ersten Unterdruckzone 19 kommunizierende Saugöffnungen 20 auf (siehe Figur 2). In Bahnlaufrichtung 17 vor den Saugöffnungen 20 und somit vor der ersten Unterdruckzone 19 ist ein sich in Querrichtung des Siebs 10 erstreckendes und als Leitblech 21 ausgebildetes Leitelement angeordnet. Das Leitblech 21 erstreckt sich hierbei in Querrichtung im wesentlichen über die luftdurchlässige Breite des Siebs 10. Das Leitelement hat eine Leitfläche 33. Ein Ende 24 der Leitfläche 33 weist gegen die Bahnlaufrichtung 17 in Richtung der Unterseite 22 des TAD- Siebs 10 und das andere Ende 34 der Leitfläche 33 weist in Richtung der Saugöffnungen 20. Damit ist es möglich an der Unterseite 22 des TAD- Siebs 10 mitgeführte Luftgrenzschicht 23 von dem TAD- Sieb 10 abzuschälen, von diesem wegzuführen und über die Saugöffnungen 20 in die erste Unterdruckzone 19 zu lenken. Im Bereich des Endes 24 der Leitfläche 33 ist das Leitelement 21 im Querschnitt spitz zum Sieb 10 zulaufend ausgebildet. Dadurch kann die "abgeschälte" Luftgrenzschicht 23 möglichst wirbelfrei und ohne Druckaufbau vom Sieb 10 weggeleitet werden.The suction box 15 has a plurality of suction openings 20 arranged one behind the other in the transverse direction of the TAD wire 10 and facing the web running direction and communicating with the first vacuum zone 19 (see FIG FIG. 2 ). In the web running direction 17 in front of the suction openings 20 and thus in front of the first vacuum zone 19, a guide element extending in the transverse direction of the wire 10 and designed as a guide plate 21 is arranged. The guide plate 21 extends in this case in the transverse direction substantially over the air-permeable width of the screen 10. The guide element has a guide surface 33. An end 24 of the guide surface 33 points against the web running direction 17 in the direction of the bottom 22 of the TAD sieve 10 and the other end 34 of the guide surface 33 points in the direction of the suction openings 20. Thus, it is possible on the underside 22 of the TAD sieve 10 entrained air boundary layer 23 from the TAD screen 10 peel off, away from this and to direct the suction openings 20 in the first vacuum zone 19 , In the region of the end 24 of the guide surface 33, the guide element 21 is formed tapering in cross section to the wire 10. As a result, the "peeled off" air boundary layer 23 can be led away from the wire 10 as swirl-free as possible and without pressure build-up.

Das Wegführen der Luftgrenzschicht 23 von der Unterseite 22 des TAD- Siebs 10 wird dadurch optimiert, wenn das in Richtung der Unterseite 22 des Siebs 10 weisende Ende 24 der Leitfläche 33 in unmittelbarer Nähe (hier: in zeitweisem Kontakt) zur Unterseite 22 des Siebs 10 angeordnet ist, sodass der Abstand zwischen dem Ende 24 und der Unterseite 22 des Siebs 10 möglichst gering ist und somit ein nur geringer Anteil der Luftgrenzschicht 23 im Spalt zwischen Sieb 10 und Ende 24 "entflüchten" kann.The removal of the air boundary layer 23 from the underside 22 of the TAD sieve 10 is thereby optimized when the pointing in the direction of the bottom 22 of the wire 10 end 24 of the guide surface 33 in close proximity (here: in temporary contact) to the bottom 22 of the wire 10th is arranged so that the distance between the end 24 and the bottom 22 of the wire 10 is as small as possible and thus only a small proportion of the air boundary layer 23 in the gap between the wire 10 and end 24 "escape" can.

Des weiteren weist der Saugkasten 15 eine sich in Querrichtung des Siebs 10 erstreckende und in Richtung der Unterseite 22 des Siebs 10 weisende und mit der ersten Unterdruckzone 19 kommunizierende Saugöffnung 25 auf. Die Saugöffnung 25 ist hierbei in Bahnlaufrichtung 17 hinter dem Leitblech 21 angeordnet.Furthermore, the suction box 15 has a suction opening 25 extending in the transverse direction of the wire 10 and pointing in the direction of the underside 22 of the wire 10 and communicating with the first vacuum zone 19. The suction opening 25 is in this case arranged in the web running direction 17 behind the baffle 21.

Der Bereich in dem die Saugöffnungen 20 und 25 angeordnet sind erstreckt sich im wesentlichen über die luftdurchlässige Breite des TAD- Siebs 10.The area in which the suction openings 20 and 25 are arranged extends in FIG substantially across the air-permeable width of the TAD mesh 10.

In Bahnlaufrichtung 17 hinter der ersten Unterdruckzone 19 ist der zweite Saugkasten 29 angeordnet, welcher eine zweite Unterdruckzone 26 erzeugt. Die zweite Unterdruckzone 26 erstreckt sich im wesentlichen bis zum Einlaufspalt 18 und bis zu einer auf die Wickeltrommel 5 einwirkenden Schaberklinge 27.In the web running direction 17 behind the first vacuum zone 19, the second suction box 29 is arranged, which generates a second negative pressure zone 26. The second vacuum zone 26 extends substantially to the inlet gap 18 and up to a scraper blade 27 acting on the winding drum 5.

Hierdurch wird besonders effektiv ein Abheben der Tissuepapierbahn 12 verhindert, da durch das Leitblech 21 und die erste Unterdruckzone 19 die Luftgrenzschicht 23 von der Unterseite 22 des Siebs 10 weggeleitet wird, durch die Schaberklinge 27 eine Luftgrenzschicht 28 von der Wickeltrommel 5 weggeleitet wird und durch die Bildung der zweiten Unterdruckzone 26 verhindert wird, dass sich bis zum Einlaufspalt 18 eine neue Luftgrenzschicht an der Wickeltrommel 5 und an der Unterseite 22 des Siebs 10 aufbauen kann.As a result, a lifting of the tissue paper web 12 is particularly effectively prevented because the air boundary layer 23 is led away from the bottom 22 of the screen 10 through the baffle 21 and the first vacuum zone 19, through the doctor blade 27, an air boundary layer 28 is led away from the winding drum 5 and through the Forming the second negative pressure zone 26 is prevented that can build up to the inlet gap 18, a new air boundary layer on the winding drum 5 and on the bottom 22 of the screen 10.

Im vorliegenden Ausführungsbeispiel sind die erste Unterdruckzone 19 und die zweite Unterdruckzone 26 zueinander separat besaugt.In the present embodiment, the first negative pressure zone 19 and the second negative pressure zone 26 are each separately evacuated.

Um die Bildung der Luftgrenzschicht 23 bereits im Vorlauf zu reduzieren, ist in Bahnlaufrichtung 17 vor dem Leitblech 21 der dritte Saugkasten 30 angeordnet, welcher eine dritte auf die Unterseite 22 des Siebs 10 wirkende Unterdruckzone 31 erzeugt. Die dritte Unterdruckzone 31 wirkt über eine mit ihr kommunizierende Saugöffnung 32 auf die Unterseite 22 des Siebs 10 ein.In order to reduce the formation of the air boundary layer 23 already in the flow, the third suction box 30 is arranged in the web running direction 17 in front of the baffle 21, which generates a third on the bottom 22 of the screen 10 acting vacuum zone 31. The third negative pressure zone 31 acts on the underside 22 of the screen 10 via a suction opening 32 communicating with it.

Die Figur 2 zeigt eine abschnittweise Detailvergrößerung der erfindungsgemäßen Vorrichtung 11. Zu erkennen ist ein Teil des ersten Saugkastens 15, durch welchen eine erste Unterdruckzone 19 gebildet wird. Der Saugkasten 15 weist gegen die Bahnlaufrichtung 17 weisende Saugöffnungen 20 und in Richtung der Unterseite 22 des Siebs 10 weisende Saugöffnungen 25 auf, welche mit der ersten Unterdruckzone 19 kommunizieren. Das Leitelement 21 ist im Bereich des zur Unterseite 22 des Siebs 10 weisenden Endes 24 der Leitfläche 33 im Querschnitt spitz zur Unterseite 22 zulaufend ausgebildet und zur Unterseite 22 unmittelbar benachbart abgeordnet.The FIG. 2 shows a section detail detail of the device 11 according to the invention can be seen is a part of the first suction box 15, through which a first negative pressure zone 19 is formed. The suction box 15 has facing the web running direction 17 suction openings 20 and in the direction of the bottom 22 of the wire 10 facing suction openings 25, which communicate with the first vacuum zone 19. The guide element 21 is in the region of the bottom 22 of the screen 10 facing end 24 of the guide surface 33 in cross-section pointed to the bottom 22 formed tapered and seconded to the bottom 22 immediately adjacent.

Die mit dem Sieb 10 mitgeführte Luftgrenzschicht 23 wird durch die spitze Ausbildung des Leitblechs 21 im Bereich des Endes 24 der Leitfläche von der Unterseite 22 des Siebs 10 abgeschält und durch das Leitblech 21 weggeleitet und in die Saugöffnung 20 in die erste Unterdruckzone 19 gelenkt.The entrained with the sieve 10 air boundary layer 23 is peeled off by the pointed formation of the baffle 21 in the region of the end 24 of the guide surface of the bottom 22 of the wire 10 and led away through the guide plate 21 and directed into the suction port 20 into the first vacuum zone 19.

Die Figur 3 zeigt die Vorrichtung 11 in Schnittlinie A-A. Man erkennt den ersten Saugkasten 15mit den entgegen der Bahnlaufrichtung 17 weisenden Saugöffnungen 20 und den in Richtung der Unterseite 22 des Siebs weisenden Saugöffnungen 25.The FIG. 3 shows the device 11 in section line AA. The first suction box 15 can be seen with the suction openings 20 facing the web running direction 17 and the suction openings 25 pointing in the direction of the underside 22 of the wire.

Die Saugöffnungen 20 und 25 sind in Quererstreckung des Siebs 10 hintereinander liegend angeordnet, wobei sich deren Anordnung im wesentlichen auf die luftdurchlässige Breite des TAD- Siebs 10 erstreckt (Das Sieb 10 ist in der dargestellten Ausführungsform auf seiner gesamten Breite luftdurchlässig).The suction openings 20 and 25 are arranged one behind the other in the transverse extent of the screen 10, their arrangement extending substantially to the air-permeable width of the TAD screen 10 (the screen 10 is permeable to air over its entire width in the illustrated embodiment).

Die Figur 4 zeigt die Vorrichtung 11 in Schnittlinie B-B. Man erkennt den dritten Saugkasten 30 mit der in Richtung der Unterseite 22 des Siebs 10 weisenden und sich in Querrichtung des Siebs 10 erstreckenden Saugöffnung 32.The FIG. 4 shows the device 11 in section BB. The third suction box 30 can be seen with the suction opening 32 extending in the direction of the underside 22 of the wire 10 and extending in the transverse direction of the wire 10.

Die Saugöffnungen 32 sind in Quererstreckung des Siebs 10 hintereinander liegend angeordnet, wobei sich deren Anordnung im wesentlichen auf die luftdurchlässige Breite des TAD- Siebs 10 erstreckt (Das Sieb 10 ist in der dargestellten Ausführungsform auf seiner gesamten Breite luftdurchlässig).The suction openings 32 are arranged one behind the other in the transverse extent of the screen 10, their arrangement extending substantially to the air-permeable width of the TAD screen 10 (the screen 10 is permeable to air over its entire width in the illustrated embodiment).

Claims (21)

  1. Transfer apparatus (6) having a device (11) for stabilizing the transport of a web (12) of material, in particular a fibrous web, guided on the upper side (14) of an air-permeable fabric (10), the device (11) being arranged on the underside of the fabric and, in the web running direction, immediately before an inlet nip (18) formed between a roll (5) and the fabric (10), and having a first negative pressure zone (19) acting on the underside of the fabric, the device (11) having at least one suction opening (20) pointing substantially counter to the web running direction (17) and communicating with the first negative pressure zone (19) of the device, characterized in that the air boundary layer (23) carried along by the underside of the fabric is at least partly sucked from the fabric (10) directly through the suction opening into the first negative pressure zone (19).
  2. Transfer apparatus (6) according to Claim 1, characterized in that a plurality of suction openings (20) located one after another are arranged in the transverse direction of the fabric.
  3. Transfer apparatus (6) according to Claim 1, characterized in that a suction opening is provided which extends in the transverse direction, in particular substantially over the width of the fabric.
  4. Transfer apparatus (6) according to one of Claims 1 to 3, characterized in that a guide element (21) is provided which is arranged in such a way that the air boundary layer (23) carried along by the underside of the fabric is at least partly led from the fabric (10) to the suction opening (20).
  5. Transfer apparatus (6) according to Claim 4, characterized in that, in the web running direction, the guide element (21) is arranged before the first negative pressure zone (19).
  6. Transfer apparatus (6) according to Claim 5, characterized in that the guide element (21) has a guide surface (33).
  7. Transfer apparatus (6) according to Claim 6, characterized in that, at one end, the guide surface (33) points counter to the web running direction in the direction of the underside (22) of the fabric (10) and, at the other end, points in the direction of the suction opening (20) pointing counter to the web running direction.
  8. Transfer apparatus (6) according to Claim 7, characterized in that the end (24) of the guide surface (33) that points in the direction of the underside (22) of the fabric is arranged in the immediate vicinity of the underside (22) of the fabric (10).
  9. Transfer apparatus (6) according to either of Claims 7 and 8, characterized in that, in the region of the end of the guide surface (33) that points towards the underside (22) of the fabric (10), the cross section of the guide element (21) is formed so as to taper towards the fabric.
  10. Transfer apparatus (6) according to one of the preceding Claims 4 to 9, characterized in that the guide element (21) extends substantially over the air-permeable width of the fabric (10).
  11. Transfer apparatus (6) according to one of the preceding claims, characterized in that the device (11) has at least one suction opening (25) pointing substantially in the direction of the underside of the fabric and communicating with the first negative pressure zone (19) of the device.
  12. Transfer apparatus (6) according to Claim 11, characterized in that a plurality of suction openings (25) are arranged located one after another in the transverse direction of the fabric.
  13. Transfer apparatus (6) according to Claim 11, characterized in that a suction opening (25) is provided which extends in the transverse direction, in particular substantially over the width of the fabric.
  14. Transfer apparatus (6) according to one of the preceding claims, characterized in that a second negative pressure zone (26) is formed between the first negative pressure zone (19) and the inlet nip (18).
  15. Transfer apparatus (6) according to Claim 14, characterized in that the first (19) and the second (26) negative pressure zone coincide.
  16. Transfer apparatus (6) according to one of the preceding claims, characterized in that, immediately before the inlet nip (18), a doctor blade (27) acting on the roll (5) is arranged in such a way that the air boundary layer carried along by the roll (5) is led away from the roll (5).
  17. Transfer apparatus (6) according to Claim 16, characterized in that the first (19) and/or the second (26) negative pressure zone is/are formed in the region between inlet nip (18), doctor blade (27) and the guide element (21).
  18. Transfer apparatus (6) according to one of the preceding Claims 4 to 17, characterized in that, in the web running direction (17), a third negative pressure zone (31) acting on the underside (22) of the fabric (10) is formed before the guide element (21).
  19. Transfer apparatus (6) according to one of the preceding claims, characterized in that the transfer apparatus (6) is arranged between a drying apparatus, in particular a Yankee drying cylinder (2), and a reel-up apparatus (3) of a tissue machine (1).
  20. Transfer apparatus (6) according to one of the preceding claims, characterized in that the fabric (10) is structured and/or has a rough surface and/or is voluminous.
  21. Transfer apparatus (6) according to one of the preceding claims, characterized in that the fabric (10) is a belt or embossing belt or felt or embossing felt or membrane, in particular a Spectra membrane or TAD (through air dryer) belt.
EP05761171A 2004-08-09 2005-07-06 Device for stabilising a web Not-in-force EP1778915B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004038769A DE102004038769A1 (en) 2004-08-09 2004-08-09 Device for web stabilization
PCT/EP2005/053226 WO2006015918A1 (en) 2004-08-09 2005-07-06 Device for stabilising a web

Publications (2)

Publication Number Publication Date
EP1778915A1 EP1778915A1 (en) 2007-05-02
EP1778915B1 true EP1778915B1 (en) 2010-03-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05761171A Not-in-force EP1778915B1 (en) 2004-08-09 2005-07-06 Device for stabilising a web

Country Status (6)

Country Link
US (1) US8080132B2 (en)
EP (1) EP1778915B1 (en)
AT (1) ATE462835T1 (en)
BR (1) BRPI0515022A (en)
DE (2) DE102004038769A1 (en)
WO (1) WO2006015918A1 (en)

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US8080132B2 (en) 2011-12-20
WO2006015918A1 (en) 2006-02-16
BRPI0515022A (en) 2008-07-01
ATE462835T1 (en) 2010-04-15
US20080053632A1 (en) 2008-03-06
DE502005009323D1 (en) 2010-05-12
EP1778915A1 (en) 2007-05-02
DE102004038769A1 (en) 2006-02-23

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