EP1479818B1 - Guiding device for guiding webs - Google Patents

Guiding device for guiding webs Download PDF

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Publication number
EP1479818B1
EP1479818B1 EP04102033A EP04102033A EP1479818B1 EP 1479818 B1 EP1479818 B1 EP 1479818B1 EP 04102033 A EP04102033 A EP 04102033A EP 04102033 A EP04102033 A EP 04102033A EP 1479818 B1 EP1479818 B1 EP 1479818B1
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EP
European Patent Office
Prior art keywords
web
guide device
air
web guide
porous material
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.)
Not-in-force
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EP04102033A
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German (de)
French (fr)
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EP1479818A1 (en
Inventor
Roland Mayer
Peter Kahl
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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 EP1479818A1 publication Critical patent/EP1479818A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/32—Arrangements for turning or reversing webs
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/36—Guiding mechanisms
    • D21F1/40—Rolls
    • 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
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
    • B65H2406/111—Means using fluid made only for exhausting gaseous medium producing fluidised bed for handling material along a curved path, e.g. fluidised turning bar
    • 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
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
    • B65H2406/113—Details of the part distributing the air cushion
    • B65H2406/1131—Porous material

Definitions

  • the invention relates to a web guide device with at least one guide element for non-contact web guide in one of the production and / or treatment of a material web, in particular paper or board web, serving machine. It further relates to a machine for producing and / or treating a material web, in particular paper or board web, with at least one such web guide device.
  • the guide element is designed as a rotating, guide roller, which is also surrounded by the web and at least one screen belt and has a guide surface.
  • the guide element is designed as a rotating, guide roller, which is also surrounded by the web and at least one screen belt and has a guide surface.
  • the document DE 196 51 191 A1 relates to a dryer section of a machine for producing a material web, in particular a paper or board web, with at least one drying cylinder each having at least one drying cylinder and having a deflection, within which the material web is guided together with a conveyor belt, wherein the drying cylinders are formed as suction rollers and the Conveyor belt and the material web are guided so that the conveyor belt is guided directly on the drying cylinder and the material web on the side facing away from the drying cylinder of the conveyor belt, and wherein the drying cylinder is associated with a dryer hood, which acts on the conveyor belt lying on the conveyor belt with hot air.
  • the invention has for its object to provide an improved web guide device and an improved machine of the type mentioned, in which the aforementioned disadvantages are eliminated.
  • a stable wrinkle-free and reliable web guide of the wet web should be achieved without adhesion.
  • the object is achieved in that the guide roller is driven and the guide surface at least partially from air-permeable porous material consists, which is acted upon by compressed air to form an air cushion over the air flowing through this porous material between the guide surface and the moving material web.
  • the high pressure loss on the porous material produces a very uniform air cushion, so that the material web is reliably guided at a relatively small distance from the surface. This brings in particular a wrinkle-free run with it.
  • the relatively high internal pressure prevents any adhesion to the surface.
  • the web guiding device can therefore in particular comprise at least one driven guide roll, which is additionally looped around by at least one wire belt and which is supplied with compressed air and has an open surface, but with a high pressure loss, through which air is pressed from the inside.
  • a stable uniform air cushion is generated both in time and space, which leads the web in particular after a press, preferably directly after such a press, and / or before an impingement dryer without adhesion to the guide element.
  • the guide roller comprises at least one pressure chamber via which the porous material can be acted upon with compressed air.
  • the porous material may be at least partially applied to a carrier containing the pressure chamber, provided with air passage openings.
  • the porous material forms at least a part of the pressure chamber wall.
  • the pressure in the pressure chamber may in particular be greater than 0.5 bar, wherein it is preferably greater than 1 bar.
  • the specific volume flow in the porous material is suitably in a range of about 10 to about 5000 Nm 3 / h ⁇ m 2 .
  • the hole or pore distance or the distance of the outlet openings of the air-permeable porous material is preferably less than 1 mm.
  • the porous material is in particular such that no individual jets, but instead a very uniform air cushion is generated, whereby a very good web guide is ensured, which remains contact-free in any case, especially in holes, cracks or straps.
  • the mean size of the outlet openings, pores and / or holes of the porous material is less than 0.2 mm and preferably less than 0.1 mm.
  • the porous material is chosen so that there is a high pressure loss from the inside to the environment, whereby a very uniform air cushion is generated.
  • the pressure loss is, in particular, from the side facing away from the moving material web side to the material web side of the porous material greater than 0.2 bar and preferably greater than 0.8 bar.
  • the thickness of the air cushion formed between the guide surface and the moving material web and thus the web distance to the surface is expediently less than 5 mm and preferably less than 3 mm.
  • the guide roll may have a diameter in a range of about 100 to about 2500 mm, and preferably in a range of about 500 to about 1500 mm.
  • the wire belt looping around the guide roller can be guided between the guide roller and the material web or on the side of the material web remote from the guide roller, i. lie outside.
  • the guide roller is composed of several individual segments in the transverse direction and / or in the machine direction.
  • the segments can be assigned a common compressed air supply.
  • the segments can also be supplied at least partially via separate compressed air supplies.
  • a zone-wise separate compressed air supply is provided via individual separate segments and / or segment groups in the machine running direction and / or in the transverse direction. In the machine direction or transverse direction, therefore, a special zonal pressure graduation can take place.
  • the web guiding device according to the invention can be used in particular in a machine for producing and / or treating a material web, in particular a paper or board web.
  • the rotating, driven guide roller is this Web guiding device preferably also surrounded by at least one screen belt, apart from the material web.
  • a corresponding web guide device or guide roller can therefore in particular be used as a replacement for a conventional paper guide roller for a press, i. be provided in a range of very moist, sensitive web. This has the advantage that the train no longer has to be deducted.
  • At least one corresponding web guiding device is provided in front of an air dryer, preferably an impingement dryer.
  • the corresponding web feed device or guide roller can be provided in particular directly in front of such an air or impingement dryer. This results in particular in an impingement dryer directly after the press, with intervening inventive guide roll, space advantages.
  • FIGS. 1 and 2 show in a schematic representation comparable exemplary embodiments of a contactless web guide serving as a rotating, driven guide roller 10 running guide element of a web guide device, which is particularly useful in one of the production and / or treatment of a material web, in particular paper or board web, serving machine.
  • this guide roller 10 is preferably provided after a press of a press arrangement and / or in front of an air dryer, in particular impingement dryer, wherein it is preferably also wrapped by a screen belt 40 except from the material web (see also FIG. 3 ).
  • the guide roller 10 has a guide surface 12, which consists of air-permeable porous material 14, which is acted upon from the inside with compressed air to form an air cushion 18 through the air flowing through the porous material 14 and air 16 moving web.
  • the guide roller 10 comprises at least one pressure chamber 20, via which the porous material 14 can be acted upon with compressed air.
  • the guide roller 10 can comprise, for example, a carrier 24 containing the pressure chamber 20 and provided with at least one and preferably a plurality of air passage openings 22, on which the porous material 14 is applied.
  • this preferably cylindrical carrier 24 is completely surrounded by porous material 14 in the circumferential direction.
  • the wall of the pressure chamber 20 may also be provided only over a part of its circumference with air passage openings 22, so that the air cushion 18 is generated only over part of the circumference of the guide roller 10. Expediently, the air cushion 18 is produced at least in the region in which the material web wraps around the guide roller 10.
  • the guide roller 10 and the pressure chamber in the transverse direction in at least two zones or segments 20 ', 20 "be divided over which the porous material 14 in the transverse direction, if necessary, separately acted upon with compressed air FIG. 1
  • the zones 20 ', 20 are at least temporarily subjected to the same pressure FIG. 2 the same guide roll 10 in a phase in which the zones or segments 20 ', 20 "are currently subjected to different pressure.
  • the pressure can vary across the width, i.e., across the width requirements. be varied in the desired manner in the transverse direction.
  • FIG. 3 shows a schematic representation of an example before an impingement dryer 38 arranged guide roller 10, which is additionally wrapped by a screen belt 40, wherein the screen belt 40 between the guide roller 10 and web 28 is arranged. Subsequently, the screen belt 40 is guided together with the material web 28 through the dryer 38.
  • the impingement dryer 38 may in particular be arranged directly after a press of a press arrangement or press section, wherein the guide roll 10 according to the invention is then arranged between the press and the air or impingement dryer.

Abstract

A papermaking assembly has an airturn guide rod (10) emitting compressed air through its porous surface to form an air cushion between the rod and a wet moving paper or carton web (28). The web moves over the airturn guide with a sieve belt (40). The airturn rod guide is located after a machine press, press arrangement or press section, and/or prior to an air drier e.g. an impingement drier. The rod-shaped guide has an outer air-porous surface (12) supported by an air-porous tubular supporting rod (24) with an internal feed of compressed air. Separation between the web and rod is maintained by an air cushion. The air pressure is maintained above 1 bar in the pressure chamber. The specific volume flow in the porous material is in the range 10 to 5000 Nm/h m. The intervals between adjacent pores is less than 1 mm. The average pore diameter is less than 0.1 mm. The drop in pressure between the pressure chamber and pore outer surface is greater than 0.8 bar. The air cushion between the pore outer surface and moving web is less than 3 mm. The rod rotates about its longitudinal axis. The rod diameter is 500 to 1500 mm.

Description

Die Erfindung betrifft eine Bahnführungseinrichtung mit wenigstens einem Leitelement zur berührungslosen Bahnführung in einer der Herstellung und/oder Behandlung einer Materialbahn, insbesondere Papier- oder Kartonbahn, dienenden Maschine. Sie betrifft ferner eine Maschine zur Herstellung und/oder Behandlung einer Materialbahn, insbesondere Papier- oder Kartonbahn, mit wenigstens einer solchen Bahnführungseinrichtung. Das Leitelement ist als rotierende, Leitwalze ausgeführt, die außer von der Materialbahn auch von zumindest einem Siebband umschlungen ist und eine Leitfläche besitzt.The invention relates to a web guide device with at least one guide element for non-contact web guide in one of the production and / or treatment of a material web, in particular paper or board web, serving machine. It further relates to a machine for producing and / or treating a material web, in particular paper or board web, with at least one such web guide device. The guide element is designed as a rotating, guide roller, which is also surrounded by the web and at least one screen belt and has a guide surface.

Das Leitelement ist als rotierende, Leitwalze ausgeführt, die außer von der Materialbahn auch von zumindest einem Siebband umschlungen ist und eine Leitfläche besitzt.The guide element is designed as a rotating, guide roller, which is also surrounded by the web and at least one screen belt and has a guide surface.

Das Dokument DE 196 51 191 A1 betrifft eine Trockenpartie einer Maschine zur Herstellung einer Materialbahn, insbesondere einer Papier- oder Kartonbahn, mit mindestens einer jeweils mindestens einen Trockenzylinder und eine Umlenkeinrichtung aufweisenden Trockengruppe, innerhalb derer die Materialbahn gemeinsam mit einem Transportband gefuehrt wird, wobei die Trockenzylinder als Saugwalzen ausgebildet sind und das Transportband und die Materialbahn so gefuehrt sind, dass das Transportband unmittelbar auf dem Trockenzylinder und die Materialbahn auf der dem Trockenzylinder abgewandten Seite des Transportbands gefuehrt wird, und wobei dem Trockenzylinder eine Trockenhaube zugeordnet ist, die die auf dem Transportband aufliegende Materialbahn mit Heissluft beaufschlagt.The document DE 196 51 191 A1 relates to a dryer section of a machine for producing a material web, in particular a paper or board web, with at least one drying cylinder each having at least one drying cylinder and having a deflection, within which the material web is guided together with a conveyor belt, wherein the drying cylinders are formed as suction rollers and the Conveyor belt and the material web are guided so that the conveyor belt is guided directly on the drying cylinder and the material web on the side facing away from the drying cylinder of the conveyor belt, and wherein the drying cylinder is associated with a dryer hood, which acts on the conveyor belt lying on the conveyor belt with hot air.

Bisher wird die Materialbahn mittels Leitwalzen geführt, bei denen ein Kontakt zur Oberfläche sowie ein Antrieb zwingend erforderlich sind. Eine solche Bahnführung ist nun aber relativ aufwendig und teuer. Die Bahn muss von der Oberfläche solcher Leitwalzen abgezogen werden, wozu entsprechende Abziehkräfte aufzubringen sind.So far, the material web is guided by guide rollers, in which a contact with the surface and a drive are absolutely necessary. Such a web guide is now relatively expensive and expensive. The web must be pulled off the surface of such guide rolls, for which appropriate peel-off forces are to be applied.

Der Erfindung liegt die Aufgabe zugrunde, eine verbesserte Bahnführungseinrichtung sowie eine verbesserte Maschine der eingangs genannten Art zu schaffen, bei denen die zuvor genannten Nachteile beseitigt sind. Dabei soll insbesondere eine stabile faltenfreie und zuverlässige Bahnführung der nassen Bahn ohne Adhäsion erreicht werden.The invention has for its object to provide an improved web guide device and an improved machine of the type mentioned, in which the aforementioned disadvantages are eliminated. In particular, a stable wrinkle-free and reliable web guide of the wet web should be achieved without adhesion.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Leitwalze angetrieben ist und die Leitfläche zumindest teilweise aus luftdurchlässigem porösen Material besteht, das mit Druckluft beaufschlagbar ist, um über die durch dieses poröse Material hindurchströmende Luft zwischen der Leitfläche und der bewegten Materialbahn ein Luftpolster zu bilden.The object is achieved in that the guide roller is driven and the guide surface at least partially from air-permeable porous material consists, which is acted upon by compressed air to form an air cushion over the air flowing through this porous material between the guide surface and the moving material web.

Der hohe Druckverlust an dem porösen Material erzeugt ein sehr gleichmäßiges Luftpolster, so dass die Materialbahn in einem relativ kleinen Abstand zur Oberfläche zuverlässig geführt wird. Dies bringt insbesondere einen faltenfreien Lauf mit sich. Der relativ hohe Innendruck verhindert jegliche Adhäsion zur Oberfläche.The high pressure loss on the porous material produces a very uniform air cushion, so that the material web is reliably guided at a relatively small distance from the surface. This brings in particular a wrinkle-free run with it. The relatively high internal pressure prevents any adhesion to the surface.

Die Bahnführungseinrichtung kann also insbesondere wenigstens eine angetriebene, zusätzlich von wenigstens einem Siebband umschlungene Leitwalze umfassen, die mit Druckluft versorgt wird und eine offene Oberfläche, jedoch mit hohem Druckverlust, besitzt, durch die von innen Luft durchgedrückt wird. Damit wird sowohl zeitlich als auch räumlich ein stabiles gleichmäßiges Luftpolster erzeugt, das die Bahn insbesondere nach einer Presse, vorzugsweise direkt nach einer solchen Presse, und/oder vor einem Impingement-Trockner ohne Adhäsion zum Leitelement führt.The web guiding device can therefore in particular comprise at least one driven guide roll, which is additionally looped around by at least one wire belt and which is supplied with compressed air and has an open surface, but with a high pressure loss, through which air is pressed from the inside. Thus, a stable uniform air cushion is generated both in time and space, which leads the web in particular after a press, preferably directly after such a press, and / or before an impingement dryer without adhesion to the guide element.

Bevorzugt umfasst die Leitwalze wenigstens eine Druckkammer, über die das poröse Material mit Druckluft beaufschlagbar ist. Dabei kann das poröse Material zumindest teilweise auf einem die Druckkammer enthaltenden, mit Luftdurchtrittsöffnungen versehenen Träger aufgebracht sein. Es sind jedoch beispielsweise insbesondere auch solche Ausführungen denkbar, bei denen das poröse Material zumindest einen Teil der Druckkammerwandung bildet.Preferably, the guide roller comprises at least one pressure chamber via which the porous material can be acted upon with compressed air. In this case, the porous material may be at least partially applied to a carrier containing the pressure chamber, provided with air passage openings. However, for example, in particular, such embodiments are conceivable in which the porous material forms at least a part of the pressure chamber wall.

Der Druck in der Druckkammer kann insbesondere größer als 0,5 bar sein, wobei er vorzugsweise größer als 1 bar ist.The pressure in the pressure chamber may in particular be greater than 0.5 bar, wherein it is preferably greater than 1 bar.

Der spezifische Volumenstrom im porösen Material liegt zweckmäßigerweise in einem Bereich von etwa 10 bis etwa 5000 Nm3/h · m2.The specific volume flow in the porous material is suitably in a range of about 10 to about 5000 Nm 3 / h · m 2 .

Der Loch- oder Porenabstand bzw. der Abstand der Austrittsöffnungen des luftdurchlässigen porösen Materials ist bevorzugt kleiner als 1 mm.The hole or pore distance or the distance of the outlet openings of the air-permeable porous material is preferably less than 1 mm.

Das poröse Material ist insbesondere so beschaffen, dass keine Einzelstrahlen, sondern statt dessen ein sehr gleichmäßiges Luftpolster erzeugt wird, wodurch eine sehr gute Bahnführung sichergestellt ist, die insbesondere auch bei Löchern, Rissen oder Bändeln in jedem Fall kontaktfrei bleibt. Bei einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Bahnführungseinrichtung ist die mittlere Größe der Austrittsöffnungen, Poren und/oder Löcher des porösen Materials kleiner als 0,2 mm und vorzugsweise kleiner als 0,1 mm.The porous material is in particular such that no individual jets, but instead a very uniform air cushion is generated, whereby a very good web guide is ensured, which remains contact-free in any case, especially in holes, cracks or straps. In a preferred practical embodiment of the web guiding device according to the invention, the mean size of the outlet openings, pores and / or holes of the porous material is less than 0.2 mm and preferably less than 0.1 mm.

Bevorzugt ist das poröse Material so gewählt, dass sich ein hoher Druckverlust von Innen zur Umgebung ergibt, wodurch ein sehr gleichmäßiges Luftpolster erzeugt wird. Bei einer zweckmäßigen praktischen Ausführungsform der erfindungsgemäßen Bahnführungseinrichtung ist der Druckverlust insbesondere von der von der bewegten Materialbahn abgewandten Seite zur der Materialbahn zugewandten Seite des porösen Materials größer als 0,2 bar und vorzugsweise größer als 0,8 bar.Preferably, the porous material is chosen so that there is a high pressure loss from the inside to the environment, whereby a very uniform air cushion is generated. In an expedient practical embodiment of the web guiding device according to the invention, the pressure loss is, in particular, from the side facing away from the moving material web side to the material web side of the porous material greater than 0.2 bar and preferably greater than 0.8 bar.

Die Dicke des zwischen der Leitfläche und der bewegten Materialbahn gebildeten Luftpolsters und damit der Bahnabstand zur Oberfläche ist zweckmäßigerweise geringer als 5 mm und vorzugsweise geringer als 3 mm.The thickness of the air cushion formed between the guide surface and the moving material web and thus the web distance to the surface is expediently less than 5 mm and preferably less than 3 mm.

Die Leitwalze kann beispielsweise einen Durchmesser in einem Bereich von etwa 100 bis etwa 2500 mm und vorzugsweise in einem Bereich von etwa 500 bis etwa 1500 mm besitzen.For example, the guide roll may have a diameter in a range of about 100 to about 2500 mm, and preferably in a range of about 500 to about 1500 mm.

Das die Leitwalze umschlingende Siebband kann zwischen der Leitwalze und der Materialbahn oder auf der von der Leitwalze abgewandten Seite der Materialbahn geführt sein, d.h. außen liegen.The wire belt looping around the guide roller can be guided between the guide roller and the material web or on the side of the material web remote from the guide roller, i. lie outside.

Bei einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Bahnführungseinrichtung ist die Leitwalze in Querrichtung und/oder in Maschinenlaufrichtung aus mehreren einzelnen Segmenten zusammengesetzt.In a preferred practical embodiment of the web guide device according to the invention, the guide roller is composed of several individual segments in the transverse direction and / or in the machine direction.

Dabei kann zumindest einem Teil der Segmente eine gemeinsame Druckluftversorgung zugeordnet sein. Die Segmenten können jedoch auch zumindest teilweise über getrennte Druckluftversorgungen versorgt werden.In this case, at least a part of the segments can be assigned a common compressed air supply. However, the segments can also be supplied at least partially via separate compressed air supplies.

Bei einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Bahnführungseinrichtung ist über einzelne getrennte Segmente und/oder Segmentgruppen in Maschinenlaufrichtung und/oder in Querrichtung eine zonenweise getrennte Druckluftbeaufschlagung vorgesehen. In Maschinenlaufrichtung bzw. Querrichtung kann also eine spezielle zonenweise Druckabstufung erfolgen.In a preferred practical embodiment of the web guiding device according to the invention, a zone-wise separate compressed air supply is provided via individual separate segments and / or segment groups in the machine running direction and / or in the transverse direction. In the machine direction or transverse direction, therefore, a special zonal pressure graduation can take place.

Wie bereits erwähnt, kann die erfindungsgemäße Bahnführungseinrichtung insbesondere in einer Maschine zur Herstellung und/oder Behandlung einer Materialbahn, insbesondere Papier- oder Kartonbahn, eingesetzt werden. Dabei ist die rotierende, angetriebene Leitwalze dieser Bahnführungseinrichtung außer von der Materialbahn bevorzugt auch von zumindest einem Siebband umschlungen.As already mentioned, the web guiding device according to the invention can be used in particular in a machine for producing and / or treating a material web, in particular a paper or board web. The rotating, driven guide roller is this Web guiding device preferably also surrounded by at least one screen belt, apart from the material web.

Gemäß einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Maschine ist nach einer Presse einer Pressenanordnung oder Pressenpartie, vorzugsweise direkt nach einer solchen Presse, wenigstens eine entsprechende, d.h. erfindungsgemäße Bahnführungseinrichtung vorgesehen. Eine entsprechende Bahnführungseinrichtung bzw. Leitwalze kann also insbesondere als Ersatz für eine herkömmliche Papierleitwalze nach einer Presse, d.h. in einem Bereich noch sehr feuchter, empfindlicher Bahn vorgesehen sein. Dies bringt den Vorteil mit sich, dass die Bahn nicht mehr abgezogen werden muss.According to a preferred practical embodiment of the machine according to the invention, after a press of a press assembly or press section, preferably directly after such a press, at least one corresponding, i.e., in the press provided web guide device according to the invention. A corresponding web guide device or guide roller can therefore in particular be used as a replacement for a conventional paper guide roller for a press, i. be provided in a range of very moist, sensitive web. This has the advantage that the train no longer has to be deducted.

Von Vorteil ist insbesondere auch, wenn vor einem Lufttrockner, vorzugsweise einem Impingement-Trockner, wenigstens eine entsprechende Bahnführungseinrichtung vorgesehen ist. Dabei kann die entsprechende Bahnzuführungseinrichtung bzw. Leitwalze insbesondere direkt vor einem solchen Luft- bzw. Impingement-Trockner vorgesehen sein. Dabei ergeben sich insbesondere bei einem Impingement-Trockner direkt nach der Presse, mit dazwischen liegender erfindungsgemäßer Leitwalze, Bauraum-Vorteile.It is also particularly advantageous if at least one corresponding web guiding device is provided in front of an air dryer, preferably an impingement dryer. In this case, the corresponding web feed device or guide roller can be provided in particular directly in front of such an air or impingement dryer. This results in particular in an impingement dryer directly after the press, with intervening inventive guide roll, space advantages.

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

Figur 1
eine schematische Längsschnittsdarstellung einer Leitwalze, die in Querrichtung in zumindest zwei Zonen oder Segmente unterteilt ist, wobei im vorliegenden Fall die verschiedenen Segmente mit gleichem Druck beaufschlagt sind,
Figur 2
eine mit der Ausführung gemäß Figur 1 vergleichbare Ausführungsform der Leitwalze, wobei im vorliegenden Fall die verschiedenen Segmente jedoch mit unterschiedlichem Druck beaufschlagt sind, und
Figur 3
eine schematische Darstellung einer Ausführungsform, bei der eine z.B. nach einer Presse und vor einem Impingement-Trockner angeordnete Leitwalze zusätzlich von einem Sieb umschlungen ist.
The invention is explained in more detail below with reference to embodiments with reference to the drawing; in this show:
FIG. 1
3 is a schematic longitudinal sectional view of a guide roller which is divided transversely into at least two zones or segments, wherein in the present case the different segments are subjected to the same pressure,
FIG. 2
one with the execution according to FIG. 1 Comparable embodiment of the guide roll, but in the present case, the different segments are subjected to different pressure, and
FIG. 3
a schematic representation of an embodiment in which a, for example, arranged after a press and before an impingement dryer guide roll is additionally wrapped by a wire.

Die Figuren 1 und 2 zeigen in schematischer Darstellung vergleichbare beispielhafte Ausführungsformen eines der berührungslosen Bahnführung dienenden, als rotierende, angetriebene Leitwalze 10 ausgeführten Leitelements einer Bahnführungseinrichtung, die insbesondere in einer der Herstellung und/oder Behandlung einer Materialbahn, insbesondere Papier- oder Kartonbahn, dienenden Maschine einsetzbar ist. Dabei ist diese Leitwalze 10 bevorzugt nach einer Presse einer Pressenanordnung und/oder vor einem Lufttrockner, insbesondere Impingement-Trockner, vorgesehen, wobei sie außer von der Materialbahn bevorzugt auch von einem Siebband 40 umschlungen ist (vgl. auch Figur 3).The Figures 1 and 2 show in a schematic representation comparable exemplary embodiments of a contactless web guide serving as a rotating, driven guide roller 10 running guide element of a web guide device, which is particularly useful in one of the production and / or treatment of a material web, in particular paper or board web, serving machine. In this case, this guide roller 10 is preferably provided after a press of a press arrangement and / or in front of an air dryer, in particular impingement dryer, wherein it is preferably also wrapped by a screen belt 40 except from the material web (see also FIG. 3 ).

Die Leitwalze 10 besitzt eine Leitfläche 12, die aus luftdurchlässigem porösen Material 14 besteht, das von innen her mit Druckluft beaufschlagbar ist, um über die durch das poröse Material 14 hindurchströmende Luft 16 und der bewegten Materialbahn ein Luftpolster 18 zu bilden.The guide roller 10 has a guide surface 12, which consists of air-permeable porous material 14, which is acted upon from the inside with compressed air to form an air cushion 18 through the air flowing through the porous material 14 and air 16 moving web.

Die Leitwalze 10 umfasst wenigstens eine Druckkammer 20, über die das poröse Material 14 mit Druckluft beaufschlagbar ist.The guide roller 10 comprises at least one pressure chamber 20, via which the porous material 14 can be acted upon with compressed air.

Die Leitwalze 10 kann, wie dargestellt, beispielsweise einen die Druckkammer 20 enthaltenden, mit zumindest einer und vorzugsweise mehreren Luftdurchtrittsöffnungen 22 versehenen Träger 24 umfassen, auf dem das poröse Material 14 aufgebracht ist. Im vorliegenden Fall ist dieser vorzugsweise walzenförmige Träger 24 in Umfangsrichtung vollständig von porösem Material 14 umgeben. Die Wandung der Druckkammer 20 kann jedoch auch lediglich über einen Teil ihres Umfangs mit Luftdurchtrittsöffnungen 22 versehen sein, so dass das Luftpolster 18 nur über einem Teil des Umfangs der Leitwalze 10 erzeugt wird. Zweckmäßigerweise wird das Luftpolster 18 zumindest in dem Bereich erzeugt, in dem die Materialbahn die Leitwalze 10 umschlingt.As shown, the guide roller 10 can comprise, for example, a carrier 24 containing the pressure chamber 20 and provided with at least one and preferably a plurality of air passage openings 22, on which the porous material 14 is applied. In the present case, this preferably cylindrical carrier 24 is completely surrounded by porous material 14 in the circumferential direction. However, the wall of the pressure chamber 20 may also be provided only over a part of its circumference with air passage openings 22, so that the air cushion 18 is generated only over part of the circumference of the guide roller 10. Expediently, the air cushion 18 is produced at least in the region in which the material web wraps around the guide roller 10.

Wie anhand der Figuren 1 und 2 zu erkennen ist, kann die Leitwalze 10 bzw. deren Druckkammer in Querrichtung in zumindest zwei Zonen oder Segmente 20', 20" unterteilt sein, über die das poröse Material 14 in Querrichtung ggf. getrennt mit Druckluft beaufschlagbar ist. In der in der Figur 1 wiedergegebenen Phase sind die Zonen 20', 20" zumindest zeitweise mit gleichem Druck beaufschlagt. Dagegen zeigt die Figur 2 die gleiche Leitwalze 10 in einer Phase, in der die Zonen oder Segmente 20', 20" gerade mit unterschiedlichem Druck beaufschlagt werden.As based on the Figures 1 and 2 can be seen, the guide roller 10 and the pressure chamber in the transverse direction in at least two zones or segments 20 ', 20 "be divided over which the porous material 14 in the transverse direction, if necessary, separately acted upon with compressed air FIG. 1 The zones 20 ', 20 "are at least temporarily subjected to the same pressure FIG. 2 the same guide roll 10 in a phase in which the zones or segments 20 ', 20 "are currently subjected to different pressure.

Der Druck kann also je nach den jeweiligen Anforderungen über die Breite, d.h. in Querrichtung in der gewünschten Weise variiert werden.Thus, the pressure can vary across the width, i.e., across the width requirements. be varied in the desired manner in the transverse direction.

Figur 3 zeigt in schematischer Darstellung eine z.B. vor einem Impingement-Trockner 38 angeordnete Leitwalze 10, die zusätzlich von einem Siebband 40 umschlungen ist, wobei das Siebband 40 zwischen Leitwalze 10 und Materialbahn 28 angeordnet ist. Anschließend wird das Siebband 40 zusammen mit der Materialbahn 28 durch den Trockner 38 geführt. FIG. 3 shows a schematic representation of an example before an impingement dryer 38 arranged guide roller 10, which is additionally wrapped by a screen belt 40, wherein the screen belt 40 between the guide roller 10 and web 28 is arranged. Subsequently, the screen belt 40 is guided together with the material web 28 through the dryer 38.

Der Impingement-Trockner 38 kann insbesondere direkt nach einer Presse einer Pressenanordnung oder Pressenpartie angeordnet sein, wobei die erfindungsgemäße Leitwalze 10 dann zwischen der Presse und dem Luft- bzw. Impingement-Trockner angeordnet ist.The impingement dryer 38 may in particular be arranged directly after a press of a press arrangement or press section, wherein the guide roll 10 according to the invention is then arranged between the press and the air or impingement dryer.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Leitelement, LeitwalzeGuide element, guide roller
1212
Leitflächebaffle
1414
poröses Materialporous material
1616
durchströmende Luftair flowing through
1818
Luftpolsterbubble
2020
Druckkammerpressure chamber
20'20 '
Zone, SegmentZone, segment
20"20 "
Zone, SegmentZone, segment
2222
LuftdurchtrittsöffnungAir passage opening
2424
Trägercarrier
2828
Materialbahnweb
3838
Impingement-TrocknerImpingement dryer
4040
Siebbandscreen belt

Claims (25)

  1. Web guide device having at least one guide element (10) for the non-contact guidance of a material web (28), in particular a paper or board web, the guide element being implemented as a rotating guide roll (10) around which, apart from the material web (28), at least one fabric belt (40) also wraps and which has a guide surface (12),
    characterized in that the guide roll (10) is driven and the guide surface at least partly consists of air-permeable porous material (14) to which compressed air can be applied, in order, via the air (16) flowing through this porous material (14), to form an air cushion (18) between the guide surface (12) and the moving material web (28).
  2. Web guide device according to Claim 1,
    characterized in that the guide roll (10) comprises at least one pressure chamber (20) via which compressed air can be applied to the porous material (14).
  3. Web guide device according to Claim 2,
    characterized in that the porous material (14) is at least partly applied to a support (24) which contains the pressure chamber (20) and is provided with air passage openings (22).
  4. Web guide device according to Claim 2 or 3,
    characterized in that the porous material (14) forms at least part of the pressure chamber wall.
  5. Web guide device according to one of the preceding claims,
    characterized in that the pressure in the pressure chamber (20) is greater than 0.5 bar and preferably greater than 1 bar.
  6. Web guide device according to one of the preceding claims,
    characterized in that the specific volume flow in the porous material lies in a range from about 10 to about 5000 Nm3/h·m2.
  7. Web guide device according to one of the preceding claims,
    characterized in that the hole or pore spacing or the spacing between the outlet openings of the air-permeable porous material (14) is less than 1 mm.
  8. Web guide device according to one of the preceding claims,
    characterized in that the average size of the outlet openings, pores and/or holes in the porous material (14) is less than 0.2 mm and preferably less than 0.1 mm.
  9. Web guide device according to one of the preceding claims,
    characterized in that the pressure loss from the side of the porous material (14) facing away from the moving material web (28) to the side facing the material web (28) is greater than 0.2 bar and preferably greater than 0.8 bar.
  10. Web guide device according to one of the preceding claims,
    characterized in that the thickness of the air cushion (18) formed between the guide surface (12) and the moving material web (28) is less than 5 mm and preferably less than 3 mm.
  11. Web guide device according to one of the preceding claims,
    characterized in that the guide roll (10) has a diameter in a range from about 100 to about 2500 mm and preferably in a range from about 500 mm to about 1500 mm.
  12. Web guide device according to one of the preceding claims,
    characterized in that the moving belt (40), in particular fabric belt, is guided between the guide roll (10) and the material web (28).
  13. Web guide device according to one of the preceding claims,
    characterized in that the moving belt (40), in particular fabric belt, is guided on the side of the material web (28) facing away from the guide roll (10).
  14. Web guide device according to one of the preceding claims,
    characterized in that, in the transverse direction and/or in the machine running direction (L), the guide roll (10) is assembled from a plurality of individual segments (20', 20'').
  15. Web guide device according to Claim 14,
    characterized in that at least some of the segments (20', 20") are assigned a common compressed air supply.
  16. Web guide device according to Claim 14 or 15,
    characterized in that the segments (20', 20'') are assigned at least partly separate compressed air supplies.
  17. Web guide device according to one of the preceding Claims 14-16,
    characterized in that zonally separate compressed air pressurization is provided in the machine running direction (L) and/or in the transverse direction by individually separated segments (20', 20") and/or segment groups.
  18. Machine for producing and/or treating a material web (28), in particular a paper or board web, having at least one web guide device according to one of the preceding claims.
  19. Machine according to Claim 18,
    characterized in that, apart from the material web (28), at least one fabric belt (40) also wraps around the rotating, driven guide roll (10) of the web guide device.
  20. Machine according to Claim 18 or 19,
    characterized in that at least one appropriate web guide device is provided after a press of a press arrangement or press section.
  21. Machine according to Claim 20,
    characterized in that the web guide device is provided directly after the press.
  22. Machine according to one of the preceding Claims 18-21,
    characterized in that at least one appropriate web guide device is provided before an air dryer.
  23. Machine according to Claim 22,
    characterized in that at least one appropriate web guide device is provided directly before the air dryer.
  24. Machine according to Claim 22 or 23,
    characterized in that at least one appropriate web guide device is provided before an impingement dryer (38).
  25. Machine according to Claim 24,
    characterized in that at least one appropriate web guide device is provided directly before the impingement dryer (38).
EP04102033A 2003-05-19 2004-05-11 Guiding device for guiding webs Not-in-force EP1479818B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10322515A DE10322515A1 (en) 2003-05-19 2003-05-19 Web guiding means
DE10322515 2003-05-19

Publications (2)

Publication Number Publication Date
EP1479818A1 EP1479818A1 (en) 2004-11-24
EP1479818B1 true EP1479818B1 (en) 2010-04-07

Family

ID=33039201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04102033A Not-in-force EP1479818B1 (en) 2003-05-19 2004-05-11 Guiding device for guiding webs

Country Status (3)

Country Link
EP (1) EP1479818B1 (en)
AT (1) ATE463615T1 (en)
DE (2) DE10322515A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10322519A1 (en) * 2003-05-19 2004-12-09 Voith Paper Patent Gmbh Web guiding means

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1654962A (en) * 1924-06-12 1928-01-03 Austin E Cofrin Paper-making machine
GB1218801A (en) * 1967-05-12 1971-01-13 Masson Scott Thrissell Eng Ltd Improvements in web guide members
EP0705785A3 (en) * 1994-10-07 1996-11-13 Eastman Kodak Co Method and apparatus for preventing creases in thin webs
DE19605904A1 (en) * 1995-02-23 1996-08-29 Basf Magnetics Gmbh High speed foil web etc. guide roller
DE19651191A1 (en) 1996-12-10 1998-06-18 Voith Sulzer Papiermasch Gmbh Papermaking machine drying section
FI104001B1 (en) * 1998-06-26 1999-10-29 Valmet Corp drying Lot
DE19902936A1 (en) * 1998-12-23 2000-06-29 Bachofen & Meier Ag Buelach Device for contactless guiding or treatment of a running material web, in particular a paper or cardboard web, metal or plastic film

Also Published As

Publication number Publication date
DE10322515A1 (en) 2004-12-09
ATE463615T1 (en) 2010-04-15
EP1479818A1 (en) 2004-11-24
DE502004010988D1 (en) 2010-05-20

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