EP1614647A1 - Air turn for contactless deflecting a web of fibrous material - Google Patents
Air turn for contactless deflecting a web of fibrous material Download PDFInfo
- Publication number
- EP1614647A1 EP1614647A1 EP05103547A EP05103547A EP1614647A1 EP 1614647 A1 EP1614647 A1 EP 1614647A1 EP 05103547 A EP05103547 A EP 05103547A EP 05103547 A EP05103547 A EP 05103547A EP 1614647 A1 EP1614647 A1 EP 1614647A1
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- EP
- European Patent Office
- Prior art keywords
- deflection device
- fibrous web
- air
- deflection
- bar
- 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.)
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Classifications
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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
- B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
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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
Definitions
- the invention relates to a deflection device for non-contact deflection of a paper, cardboard or other fibrous web, in particular in a production and / or finishing of the fibrous web serving machine, wherein the deflection device has an air-permeable surface.
- deflection devices for the contactless deflection of a fibrous web are known from the prior art, in which a distance of approximately 6 to 11 millimeters exists between the deflection device and the fibrous web.
- this requires a relatively high air volume flow. This distance is controlled by the air pressure inside the deflection, which is very low.
- a disadvantage of these deflection devices is that folds can easily occur in the fibrous web.
- the strip drags on the deflecting device, since the air chooses the path of least resistance and therefore flows largely laterally next to the strip from the deflecting device, so that the back pressure of the air cushion under the strip is too small to guide it contactlessly over the deflection device.
- the deflection device In order for the deflection device reliably deflects the web without contact, it must cover the entire width of the deflection device.
- EP 1 144 292 B1 which has a gas-permeable wall made of a metal-containing material, wherein the wall has continuous pores with an average diameter of less than 20 microns.
- the invention has the object of a deflection device of the type mentioned to improve that wrinkling in the fibrous web is avoidable or existing wrinkles are reliably eliminated.
- the invention solves this problem with a deflection device of the type mentioned, which according to the invention in its interior has a supply air pressure of 1 bar to 12 bar, preferably 3 to 6 bar.
- the invention relates to a deflection device of the type mentioned, the surface according to the invention an air permeability of 1 m 3 / (hm 2 bar) to 100 m 3 / (hm 2 bar), preferably 4 to 40 m 3 / (hm 2 bar) , The air permeability in this area is evenly distributed over the surface.
- the invention relates to a deflection device of the aforementioned type, which according to the invention has a volume flow through the surface of 10 m 3 / (hm 2 ) to 1000 m 3 / (hm 2 ), preferably 40 to 200 m 3 / (hm 2 ).
- the volume flow in this area is also distributed uniformly over the surface.
- the invention also relates to a deflection device of the type mentioned, which according to the invention an air line flow (ratio of the amount of air to the circumference of the deflection) of 1 to 100 m 3 / h / m, preferably 5 to 40 m 3 / h / m.
- the dynamic pressure is evenly distributed below the fibrous web. This is also the case when the fibrous web is narrower than the deflecting device. Consequently, larger areas of the deflection device, for example, when transferring a narrow strip when starting the system, remain uncovered by the fibrous web without the fibrous web on the deflection grinds. As a result, the risk of demolition of the fibrous web, despite the set web tension of 50 to 1000 N / m, in particular 100 to 300 N / m, significantly reduced.
- the reduce deflection devices according to the invention the Committee in a freshly coated fibrous web, since on the one hand from previous treatments resulting wrinkles are literally ironed out in the fibrous web or not even arise and on the other hand, the fibrous web with their still moist coating layer no longer grinds on the deflection, whereby the fresh coating layer can not be damaged.
- the height at which the fibrous web runs or flies over the deflection device is only a few mm. It can even be less than 1 mm.
- the inventors have recognized that the pore size stated in the prior art alone has no influence on a dynamic pressure independent of the fibrous web width below the fibrous web. Much more important than the pore size is a uniform distribution of the dynamic pressure under the fibrous web and the respective specified parameters.
- the surface of the deflection device may have at least one air-permeable layer.
- the air permeability can be adjusted in a targeted manner.
- the air permeability is thus independent of the pore size. Instead, the air permeability depends on the thickness of the at least one layer.
- the at least one layer can also have several segments in the circumferential direction of the deflection device.
- the surface has at least one carrier layer and at least one distributor layer.
- the carrier layer ensures the stability and strength of the entire surface. She has a high Air permeability.
- the carrier layer is realized for example by a stainless steel sheet having many small holes. Thus, in particular good results are achieved with a stainless steel sheet having holes with a diameter between 0.3 millimeters and 1 millimeter, wherein the distance between the holes is 4 millimeters.
- the distributor layer is arranged, which has the lowest possible air permeability.
- the outermost layer is the layer with the lowest air permeability, in order to ensure that the air exits perpendicularly from the deflection device. Nevertheless, it is also possible to provide the carrier layer as the outermost layer.
- the outer support layer obstructs the expansion of the lower manifold layers.
- the outer layer is mechanically particularly stressed and exposed to dirt. Therefore, it may be useful if the stable and luft fashionmayere carrier layer is disposed outside.
- the air exits the outermost carrier layer perpendicularly from the deflection device Therefore, in the construction of the carrier layer as the outermost layer, care must be taken that the carrier layer is not more permeable to air in the circumferential direction of the deflection device than perpendicular to the deflection device. Therefore, it is important that the holes in the carrier layer are not too large.
- the at least one layer can be exchangeable. Consequently, a perfect function of the deflection can be ensured even with dirt, damage or wear of the surface.
- the deflection device is the free configurability of the outer shape of the surface.
- the outer surface may have a shape of one or more circle segments.
- the surface has a larger one in a front and / or rear region viewed in the direction of travel of the fibrous web Radius than in the middle area.
- the deflection device In the deflection devices known hitherto, the deflection device must have a radius of between 200 millimeters and 600 millimeters, in particular for wide installations. In the case of the deflection device according to the invention, however, its surface can also have circular segments with a much smaller radius of approximately 12 millimeters to 300 millimeters, even in the case of wide installations.
- the deflecting device may have chambers arranged juxtaposed transversely to the running direction of the fibrous web in its interior.
- the air pressure in these chambers can be controlled separately.
- a certain pressure profile can be constructed so that the fibrous web has a minimum distance of less than one millimeter from the deflecting device, and the fibrous web is simultaneously guided wrinkle-free over the deflection device.
- the deflection device has in its interior in the direction of the fibrous web one behind the other arranged chambers.
- the air pressure in these chambers can also be controlled separately, so that more air can flow through the viewed in the direction of the fibrous web front and rear portions of the deflecting device than through the central region.
- An angle of wrap, with which the fibrous web wraps around the deflection device, can be from almost 0 ° to more than 180 °. Thus, there are almost no restrictions on the wrap angle.
- An angle of wrap of more than 180 ° is particularly advantageous after a curtain applicator.
- the edge regions of the fibrous web and also in the direction of the fibrous web viewed in front of and behind the deflection of the dynamic pressure can be lower by the easier flowing in these areas air, can at the edges of the deflection and / or viewed in the direction of the fibrous web before and / or be provided behind the deflection at least one blowpipe.
- the fibrous web does not drag on the deflection device.
- the supply air pressure according to the invention, the air permeability according to the invention and the volume flow according to the invention can most easily be realized if the surface has a porous sintered material and / or a textile material and / or a plastic.
- Textile materials significantly reduce air permeability.
- plastics can become more permeable to air through targeted stretching.
- the air permeability depends on the pore shape and the pore length, ie on the layer thickness.
- the air used may be ambient air.
- conditioned air may also be used wherein the conditioned air may be dry air or air mixed with the oil. The choice of air depends on the nature of the fibrous web.
- Fig. 1 shows a deflection device 10, over which a fibrous web 11 is guided.
- the deflection device 10 flows an air volume flow, which enters the deflection device 10 as an air flow L, and exits as many individual air streams E from the deflection device 10.
- the air streams E form under the fibrous web 11 an air film in which a certain dynamic pressure prevails, so that the fibrous web 11 is guided in an extremely small distance, which may be below one millimeter, without contact via the deflection device 10.
- the deflection device 10 has a surface 12 which has an outer layer 13 and an inner layer 14.
- the layers 13 and 14 have pores not shown here, through which the many individual air streams E exit.
- the deflection device 10 has an air permeability of 1 m 3 / (hm 2 bar) to 100 m 3 / (hm 2 bar), a volume flow of 10 m 3 / (hm 2 ) to 1000 m 3 / ( hm 2 ) and a supply air pressure in its interior of 1 bar to 12 bar and a ratio between the amount of air and the circumference of the deflection device 10, which is between 5 and 100 m 3 / h / m, on.
- the dynamic pressure is uniformly distributed below the fibrous web 11.
- the parameters according to the invention can be varied by the number of layers 13 and 14, by the thickness of the layers 13 and 14 and by the shape of the pores not shown.
- One of the layers 13 and 14 may be a carrier layer which provides the stability and strength of the surface 12. Since the carrier layer has a high air permeability, one of the layers 13 and 14 must be a distributor layer with the lowest possible air permeability, which ensures that the parameters according to the invention are maintained, and the individual air streams E emerge vertically from the deflection device 10.
- Fig. 2 shows a deflection device 20, over which the fibrous web 11 is guided.
- the deflection device 20 has a surface 21 which is provided with layers 22, 23 and 24. From the surface 21, the individual air streams E emerge, through which the fibrous web 11 is guided without contact via the deflection device 20.
- the surface 21 has an angle ⁇ , which is greater than a wrap angle ⁇ , with which the fibrous web 11 wraps around the deflection device 20.
- the parameters according to the invention ensure that the fibrous web 11 does not touch the deflection device 20 even if the wrap angle ⁇ is smaller than the angle ⁇ of the surface 21.
- the wrap angle ⁇ can be between almost 0 ° and more than 180 °. In particular, after a curtain applicator a wrap angle ⁇ of more than 180 ° is useful. Of course, then the angle ⁇ of the surface 21 must be correspondingly large.
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- Paper (AREA)
- Advancing Webs (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Coating Apparatus (AREA)
Abstract
Description
Die Erfindung betrifft eine Umlenkvorrichtung zum berührungslosen Umlenken einer Papier-, Karton- oder anderen Faserstoffbahn, insbesondere in einer der Herstellung und/oder Veredelung der Faserstoffbahn dienenden Maschine, wobei die Umlenkvorrichtung eine luftdurchlässige Oberfläche aufweist.The invention relates to a deflection device for non-contact deflection of a paper, cardboard or other fibrous web, in particular in a production and / or finishing of the fibrous web serving machine, wherein the deflection device has an air-permeable surface.
Allgemein sind aus dem Stand der Technik Umlenkvorrichtungen zum berührungslosen Umlenken einer Faserstoffbahn bekannt, bei denen zwischen der Umlenkvorrichtung und der Faserstoffbahn ein Abstand von etwa 6 bis 11 Millimetern existiert. Dafür ist jedoch ein relativ hoher Luft-Volumenstrom erforderlich. Dieser Abstand wird über den Luftdruck im Inneren der Umlenkvorrichtung geregelt, der sehr gering ist. Nachteilig bei diesen Umlenkvorrichtungen ist jedoch, dass sehr leicht Falten in der Faserstoffbahn auftreten können. Wenn die Papiermaschine oder das Auftragswerk mit einem schmalen Streifen der Faserstoffbahn angefahren wird, schleift der Streifen auf der Umlenkvorrichtung, da die Luft den Weg des geringsten Widerstandes wählt und deshalb größtenteils seitlich neben dem Streifen aus der Umlenkvorrichtung ausströmt, so dass der Staudruck des Luftpolsters unter dem Streifen zu gering ist, um ihn berührungslos über die Umlenkvorrichtung zu führen. Damit die Umlenkvorrichtung die Bahn zuverlässig berührungslos umlenkt, muss sie die gesamte Breite der Umlenkvorrichtung überdecken.In general, deflection devices for the contactless deflection of a fibrous web are known from the prior art, in which a distance of approximately 6 to 11 millimeters exists between the deflection device and the fibrous web. However, this requires a relatively high air volume flow. This distance is controlled by the air pressure inside the deflection, which is very low. A disadvantage of these deflection devices, however, is that folds can easily occur in the fibrous web. When the paper machine or the commissioned work is started up with a narrow strip of the fibrous web, the strip drags on the deflecting device, since the air chooses the path of least resistance and therefore flows largely laterally next to the strip from the deflecting device, so that the back pressure of the air cushion under the strip is too small to guide it contactlessly over the deflection device. In order for the deflection device reliably deflects the web without contact, it must cover the entire width of the deflection device.
Zur Lösung dieses Problems wird in der EP 1 144 292 B1 eine Umlenkvorrichtung vorgeschlagen, die eine gasdurchlässige Wand aus einem metallhaltigen Werkstoff aufweist, wobei die Wand durchgängige Poren mit einem mittleren Durchmesser von weniger als 20 µm aufweist.To solve this problem, a deflection device is proposed in EP 1 144 292 B1, which has a gas-permeable wall made of a metal-containing material, wherein the wall has continuous pores with an average diameter of less than 20 microns.
Die Erfindung hat die Aufgabe eine Umlenkvorrichtung der eingangs genannten Art dahingehend zu verbessern, dass eine Faltenbildung in der Faserstoffbahn vermeidbar ist bzw. vorhandene Falten zuverlässiger beseitigbar sind.The invention has the object of a deflection device of the type mentioned to improve that wrinkling in the fibrous web is avoidable or existing wrinkles are reliably eliminated.
Die Erfindung löst die gestellte Aufgabe mit einer Umlenkvorrichtung der eingangs genannten Art, die erfindungsgemäß in ihrem Inneren einen Versorgungsluftdruck von 1 bar bis 12 bar, vorzugsweise 3 bis 6 bar aufweist.The invention solves this problem with a deflection device of the type mentioned, which according to the invention in its interior has a supply air pressure of 1 bar to 12 bar, preferably 3 to 6 bar.
Ferner betrifft die Erfindung eine Umlenkvorrichtung der eingangs genannten Art, deren Oberfläche erfindungsgemäß eine Luftdurchlässigkeit von 1 m3/(h m2 bar) bis 100 m3/(h m2 bar), vorzugsweise 4 bis 40 m3/(h m2 bar) aufweist. Dabei ist die Luftdurchlässigkeit in diesem Bereich gleichmäßig über die Oberfläche verteilt.Furthermore, the invention relates to a deflection device of the type mentioned, the surface according to the invention an air permeability of 1 m 3 / (hm 2 bar) to 100 m 3 / (hm 2 bar), preferably 4 to 40 m 3 / (hm 2 bar) , The air permeability in this area is evenly distributed over the surface.
Außerdem betrifft die Erfindung eine Umlenkvorrichtung der eingangs genannten Art, die erfindungsgemäß einen Volumenstrom durch die Oberfläche von 10 m3/(h m2) bis 1000 m3/(h m2), vorzugsweise 40 bis 200 m3/(h m2) aufweist. Vorteilhafterweise ist der Volumenstrom in diesem Bereich ebenfalls gleichmäßig über die Oberfläche verteilt.Moreover, the invention relates to a deflection device of the aforementioned type, which according to the invention has a volume flow through the surface of 10 m 3 / (hm 2 ) to 1000 m 3 / (hm 2 ), preferably 40 to 200 m 3 / (hm 2 ). Advantageously, the volume flow in this area is also distributed uniformly over the surface.
Die Erfindung betrifft außerdem eine Umlenkvorrichtung der eingangs genannten Art, die erfindungsgemäß einen Luftlinienstrom (Verhältnis der Luftmenge zum Umfang der Umlenkvorrichtung) von 1 bis 100 m3/h /m, vorzugsweise 5 bis 40 m3/h /m aufweist.The invention also relates to a deflection device of the type mentioned, which according to the invention an air line flow (ratio of the amount of air to the circumference of the deflection) of 1 to 100 m 3 / h / m, preferably 5 to 40 m 3 / h / m.
Bei Verwendung einer dieser Parameterbereiche ist der Staudruck unterhalb der Faserstoffbahn gleichmäßig verteilt. Dies ist auch dann der Fall, wenn die Faserstoffbahn schmaler ist als die Umlenkvorrichtung. Folglich können auch größere Bereiche der Umlenkvorrichtung, beispielsweise beim Überführen eines schmalen Streifens beim Starten der Anlage, von der Faserstoffbahn unbedeckt bleiben, ohne dass die Faserstoffbahn auf der Umlenkvorrichtung schleift. Dadurch ist die Abrissgefahr der Faserstoffbahn trotz des eingestellten Bahnzuges von 50 bis 1000 N/m, insbesondere 100 bis 300 N/m, deutlich reduziert. Außerdem reduzieren die erfindungsgemäßen Umlenkvorrichtungen den Ausschuss bei einer frisch beschichteten Faserstoffbahn, da zum einen aus vorherigen Behandlungen resultierende Falten in der Faserstoffbahn regelrecht ausgebügelt werden oder gar nicht erst entstehen und zum anderen die Faserstoffbahn mit ihrer noch feuchten Auftragsschicht nicht mehr an der Umlenkvorrichtung schleift, wodurch die frische Auftragsschicht nicht beschädigt werden kann. Die Höhe mit der die Faserstoffbahn über die Umlenkvorrichtung läuft bzw. fliegt beträgt nur wenige mm. Sie kann sogar unter 1 mm liegen.When using one of these parameter ranges, the dynamic pressure is evenly distributed below the fibrous web. This is also the case when the fibrous web is narrower than the deflecting device. Consequently, larger areas of the deflection device, for example, when transferring a narrow strip when starting the system, remain uncovered by the fibrous web without the fibrous web on the deflection grinds. As a result, the risk of demolition of the fibrous web, despite the set web tension of 50 to 1000 N / m, in particular 100 to 300 N / m, significantly reduced. In addition, the reduce deflection devices according to the invention the Committee in a freshly coated fibrous web, since on the one hand from previous treatments resulting wrinkles are literally ironed out in the fibrous web or not even arise and on the other hand, the fibrous web with their still moist coating layer no longer grinds on the deflection, whereby the fresh coating layer can not be damaged. The height at which the fibrous web runs or flies over the deflection device is only a few mm. It can even be less than 1 mm.
Die Erfinder haben erkannt, dass die im Stand der Technik angegebene Porengröße alleine keinen Einfluss auf einen von der Faserstoffbahnbreite unabhängigen Staudruck unter der Faserstoffbahn hat. Viel wichtiger als die Porengröße ist eine gleichmäßige Verteilung des Staudruckes unter der Faserstoffbahn und die jeweils angegebenen Parameter.The inventors have recognized that the pore size stated in the prior art alone has no influence on a dynamic pressure independent of the fibrous web width below the fibrous web. Much more important than the pore size is a uniform distribution of the dynamic pressure under the fibrous web and the respective specified parameters.
Besonders gute Ergebnisse werden erzielt, wenn der Versorgungsluftdruck zwischen 3 bar und 6 bar, die Luftdurchlässigkeit zwischen 4 m3/(h m2 bar) und 40 m3/(h m2 bar), der Volumenstrom zwischen 40 m3/(h m2) und 200 m3/(h m2) und der Linienstrom zwischen 5 und 40 m3/h /m liegen.Particularly good results are achieved when the supply air pressure between 3 bar and 6 bar, the air permeability between 4 m 3 / (hm 2 bar) and 40 m 3 / (hm 2 bar), the volume flow between 40 m 3 / (hm 2 ) and 200 m 3 / (hm 2 ) and the line current is between 5 and 40 m 3 / h / m.
Die Oberfläche der Umlenkvorrichtung kann mindestens eine luftdurchlässige Schicht aufweisen. Durch die Anordnung von mehreren Schichten hintereinander kann die Luftdurchlässigkeit gezielt eingestellt werden. Die Luftdurchlässigkeit ist somit unabhängig von der Porengröße. Stattdessen ist die Luftdurchlässigkeit von der Dicke der mindestens einen Schicht abhängig. Außer der Anordnung von mehreren Schichten in Dickenrichtung hintereinander kann die mindestens eine Schicht auch in Umfangsrichtung der Umlenkvorrichtung mehrere Segmente aufweisen.The surface of the deflection device may have at least one air-permeable layer. By arranging several layers one behind the other, the air permeability can be adjusted in a targeted manner. The air permeability is thus independent of the pore size. Instead, the air permeability depends on the thickness of the at least one layer. Apart from the arrangement of several layers in the thickness direction one behind the other, the at least one layer can also have several segments in the circumferential direction of the deflection device.
In einer Weiterbildung der Erfindung weist die Oberfläche mindestens eine Trägerschicht und mindestens eine Verteilerschicht auf. Die Trägerschicht sorgt für die Stabilität und Festigkeit der gesamten Oberfläche. Sie hat eine hohe Luftdurchlässigkeit. Die Trägerschicht wird beispielsweise durch ein Edelstahlblech, das viele kleine Bohrungen aufweist, realisiert. So werden insbesondere gute Ergebnisse mit einem Edelstahlblech erzielt, das Bohrungen mit einem Durchmesser zwischen 0,3 Millimetern und 1 Millimeter aufweist, wobei der Abstand der Bohrungen 4 Millimeter beträgt. An der Trägerschicht wird die Verteilerschicht angeordnet, die eine möglichst geringe Luftdurchlässigkeit aufweist. Vorteilhafterweise ist die äußerste Schicht die Schicht mit der geringsten Luftdurchlässigkeit, damit sichergestellt ist, dass die Luft senkrecht aus der Umlenkvorrichtung austritt. Trotzdem ist es aber auch möglich, die Trägerschicht als die äußerste Schicht vorzusehen. Dies kann deshalb sinnvoll sein, weil die unteren für die Luftverteilung zuständigen Verteilerschichten die Tendenz haben sich auszudehnen. Somit behindert die äußere Trägerschicht die Ausdehnung der unteren Verteilerschichten. Außerdem wird die äußere Schicht mechanisch besonders strapaziert und Schmutz ausgesetzt. Deshalb kann es sinnvoll sein, wenn die stabile und luftdurchlässigere Trägerschicht außen angeordnet ist. Jedoch muss sichergestellt sein, dass die Luft aus der äußersten Trägerschicht senkrecht aus der Umlenkvorrichtung austritt. Deshalb ist bei der Konstruktion der Trägerschicht als äußerste Schicht darauf zu achten, dass die Trägerschicht nicht in Umfangsrichtung der Umlenkvorrichtung luftdurchlässiger ist als senkrecht zur Umlenkvorrichtung. Deshalb ist es wichtig, dass die Bohrungen in der Trägerschicht nicht zu groß sind.In one development of the invention, the surface has at least one carrier layer and at least one distributor layer. The carrier layer ensures the stability and strength of the entire surface. She has a high Air permeability. The carrier layer is realized for example by a stainless steel sheet having many small holes. Thus, in particular good results are achieved with a stainless steel sheet having holes with a diameter between 0.3 millimeters and 1 millimeter, wherein the distance between the holes is 4 millimeters. On the carrier layer, the distributor layer is arranged, which has the lowest possible air permeability. Advantageously, the outermost layer is the layer with the lowest air permeability, in order to ensure that the air exits perpendicularly from the deflection device. Nevertheless, it is also possible to provide the carrier layer as the outermost layer. This may be useful because the lower distributing layers responsible for air distribution tend to expand. Thus, the outer support layer obstructs the expansion of the lower manifold layers. In addition, the outer layer is mechanically particularly stressed and exposed to dirt. Therefore, it may be useful if the stable and luftdurchlässigere carrier layer is disposed outside. However, it must be ensured that the air exits the outermost carrier layer perpendicularly from the deflection device. Therefore, in the construction of the carrier layer as the outermost layer, care must be taken that the carrier layer is not more permeable to air in the circumferential direction of the deflection device than perpendicular to the deflection device. Therefore, it is important that the holes in the carrier layer are not too large.
Die mindestens eine Schicht kann austauschbar sein. Folglich kann auch bei Verschmutzungen, Beschädigungen oder Verschleiß der Oberfläche eine einwandfreie Funktion der Umlenkvorrichtung sichergestellt werden.The at least one layer can be exchangeable. Consequently, a perfect function of the deflection can be ensured even with dirt, damage or wear of the surface.
Ein Vorteil der Umlenkvorrichtung ist die freie Gestaltbarkeit der äußeren Form der Oberfläche. Somit kann die äußere Oberfläche im Querschnitt betrachtet eine Form eines oder mehrerer Kreissegmente aufweisen.An advantage of the deflection device is the free configurability of the outer shape of the surface. Thus, viewed in cross section, the outer surface may have a shape of one or more circle segments.
In einer bevorzugten Ausführungsform weist die Oberfläche in einem in Laufrichtung der Faserstoffbahn betrachtet vorderen und/oder hinteren Bereich einen größeren Radius als im mittleren Bereich auf. Durch diese Gestaltung der Oberfläche können Falten in der Faserstoffbahn wirkungsvoll vermieden werden, wobei trotzdem ein möglichst hoher Staudruck im vorderen und/oder im hinteren Bereich der Umlenkvorrichtung sichergestellt ist.In a preferred embodiment, the surface has a larger one in a front and / or rear region viewed in the direction of travel of the fibrous web Radius than in the middle area. By this design of the surface wrinkles in the fibrous web can be effectively avoided, while still the highest possible back pressure in the front and / or in the rear of the deflection is ensured.
Bei den bisher bekannten Umlenkvorrichtungen muss die Umlenkvorrichtung insbesondere bei breiten Anlagen einen Radius zwischen 200 Millimetern und 600 Millimetern aufweisen. Bei der erfindungsgemäßen Umlenkvorrichtung kann ihre Oberfläche jedoch auch bei breiten Anlagen Kreissegmente mit einem deutlich geringeren Radius von ca.125 Millimetern bis 300 Millimetern aufweisen.In the deflection devices known hitherto, the deflection device must have a radius of between 200 millimeters and 600 millimeters, in particular for wide installations. In the case of the deflection device according to the invention, however, its surface can also have circular segments with a much smaller radius of approximately 12 millimeters to 300 millimeters, even in the case of wide installations.
In einer weiteren Ausführungsform kann die Umlenkvorrichtung in ihrem Inneren quer zur Laufrichtung der Faserstoffbahn nebeneinander angeordnete Kammern aufweisen. Vorteilhafterweise ist der Luftdruck in diesen Kammern separat ansteuerbar. Somit kann entlang der Oberfläche der Umlenkvorrichtung ein bestimmtes Druckprofil aufgebaut werden, sodass die Faserstoffbahn einen Mindestabstand von weniger als einem Millimeter von der Umlenkvorrichtung aufweist, und die Faserstoffbahn gleichzeitig faltenfrei über die Umlenkvorrichtung geführt wird.In a further embodiment, the deflecting device may have chambers arranged juxtaposed transversely to the running direction of the fibrous web in its interior. Advantageously, the air pressure in these chambers can be controlled separately. Thus, along the surface of the deflecting a certain pressure profile can be constructed so that the fibrous web has a minimum distance of less than one millimeter from the deflecting device, and the fibrous web is simultaneously guided wrinkle-free over the deflection device.
Außerdem ist es möglich, dass die Umlenkvorrichtung in ihrem Inneren in Laufrichtung der Faserstoffbahn hintereinander angeordnete Kammern aufweist. Der Luftdruck in diesen Kammern kann ebenfalls separat gesteuert werden, sodass durch die in Laufrichtung der Faserstoffbahn betrachtet vorderen und hinteren Bereiche der Umlenkvorrichtung mehr Luft strömen kann als durch die mittleren Bereich.Moreover, it is possible that the deflection device has in its interior in the direction of the fibrous web one behind the other arranged chambers. The air pressure in these chambers can also be controlled separately, so that more air can flow through the viewed in the direction of the fibrous web front and rear portions of the deflecting device than through the central region.
Ein Umschlingungswinkel, mit dem die Faserstoffbahn die Umlenkvorrichtung umschlingt, kann von fast 0° bis zu mehr als 180° betragen. Somit gibt es für den Umschlingungswinkel nahezu keine Einschränkungen. Ein Umschlingungswinkel von mehr als 180° ist insbesondere nach einem Vorhangauftragswerk vorteilhaft.An angle of wrap, with which the fibrous web wraps around the deflection device, can be from almost 0 ° to more than 180 °. Thus, there are almost no restrictions on the wrap angle. An angle of wrap of more than 180 ° is particularly advantageous after a curtain applicator.
Da in den Randbereichen der Faserstoffbahn und auch in Laufrichtung der Faserstoffbahn betrachtet vor und hinter der Umlenkvorrichtung der Staudruck durch die in diesen Bereichen leichter abfließende Luft niedriger sein kann, kann an den Rändern der Umlenkvorrichtung und/oder in Laufrichtung der Faserstoffbahn betrachtet vor und/oder hinter der Umlenkvorrichtung mindestens ein Blasrohr vorgesehen sein. Somit ist auch in den Randbereichen der Oberfläche der Umlenkvorrichtung gewährleistet, dass die Faserstoffbahn nicht auf der Umlenkvorrichtung schleift.As viewed in the edge regions of the fibrous web and also in the direction of the fibrous web viewed in front of and behind the deflection of the dynamic pressure can be lower by the easier flowing in these areas air, can at the edges of the deflection and / or viewed in the direction of the fibrous web before and / or be provided behind the deflection at least one blowpipe. Thus, it is also ensured in the edge regions of the surface of the deflection device that the fibrous web does not drag on the deflection device.
Der erfindungsgemäße Versorgungsluftdruck, die erfindungsgemäße Luftdurchlässigkeit und der erfindungsgemäße Volumenstrom können am einfachsten realisiert werden wenn die Oberfläche ein poröses Sintermaterial und/oder einen Textilwerkstoff und/oder einem Kunststoff aufweist. Textilwerkstoffe reduzieren die Luftdurchlässigkeit deutlich. Kunststoffe können hingegen durch gezieltes Dehnen luftdurchlässiger werden. Bei gesinterten Materialien hängt die Luftdurchlässigkeit von der Porenform und der Porenlänge, also von der Schichtdicke ab.The supply air pressure according to the invention, the air permeability according to the invention and the volume flow according to the invention can most easily be realized if the surface has a porous sintered material and / or a textile material and / or a plastic. Textile materials significantly reduce air permeability. On the other hand, plastics can become more permeable to air through targeted stretching. For sintered materials, the air permeability depends on the pore shape and the pore length, ie on the layer thickness.
Vorzugsweise kann die verwendete Luft Umgebungsluft sein. Es kann jedoch auch konditionierte Luft verwendet werden, wobei die konditionierte Luft trockene Luft oder Luft, der Öl beigemischt ist, sein kann. Die Auswahl der Luft hängt von der Beschaffenheit der Faserstoffbahn ab.Preferably, the air used may be ambient air. However, conditioned air may also be used wherein the conditioned air may be dry air or air mixed with the oil. The choice of air depends on the nature of the fibrous web.
Nachfolgend werden Ausführungsbeispiele der erfindungsgemäßen Umlenkvorrichtung anhand der beiliegenden Zeichnungen näher erläutert.Embodiments of the deflection device according to the invention will be explained in more detail with reference to the accompanying drawings.
Im Einzelnen zeigen:
- Fig. 1
- einen Längsschnitt durch eine erste Ausführungsform der Umlenkvorrichtung;
- Fig. 2
- einen Querschnitt durch eine zweite Ausführungsform der
- Fig. 1
- a longitudinal section through a first embodiment of the deflection device;
- Fig. 2
- a cross-section through a second embodiment of the
Fig. 1 zeigt eine Umlenkvorrichtung 10, über die eine Faserstoffbahn 11 geführt wird. Durch die Umlenkvorrichtung 10 strömt ein Luft-Volumenstrom, der als ein Luftstrom L in die Umlenkvorrichtung 10 eintritt, und als viele einzelne Luftströme E aus der Umlenkvorrichtung 10 austritt.Fig. 1 shows a
Die Luftströme E bilden unter der Faserstoffbahn 11 einen Luftfilm, in dem ein bestimmter Staudruck herrscht, sodass die Faserstoffbahn 11 in einem äußerst geringen Abstand, der unterhalb von einem Millimeter liegen kann, berührungslos über die Umlenkvorrichtung 10 geführt wird.The air streams E form under the
Die Umlenkvorrichtung 10 weist eine Oberfläche 12 auf, die eine äußere Schicht 13 und eine innere Schicht 14 aufweist. Die Schichten 13 und 14 weisen hier nicht näher dargestellte Poren auf, durch welche die vielen einzelnen Luftströme E austreten.
Durch die Schichten 13 und 14 weist die Umlenkvorrichtung 10 eine Luftdurchlässigkeit von 1 m3/(h m2 bar) bis 100 m3/(h m2 bar), einen Volumenstrom von 10 m3/(h m2) bis 1000 m3/(h m2) und einen Versorgungsluftdruck in ihrem Inneren von 1 bar bis 12 bar sowie ein Verhältnis zwischen Luftmenge und Umfang der Umlenkvorrichtung 10 auf, das zwischen 5 und 100 m3/h /m beträgt, auf.
Durch diese Parameterbereiche ist der Staudruck unterhalb der Faserstoffbahn 11 gleichmäßig verteilt. Dies ist auch dann der Fall, wenn die Umlenkvorrichtung 10, wie in Fig. 1 dargestellt, breiter ist als die Faserstoffbahn 11. Somit können auch größere Bereiche der Umlenkvorrichtung 10, beispielsweise beim Überführen eines schmalen Streifens beim Starten einer Anlage, von der Faserstoffbahn 11 unbedeckt bleiben, ohne dass die Faserstoffbahn 11 auf der Umlenkvorrichtung 10 schleift.The
Through the
Through these parameter ranges, the dynamic pressure is uniformly distributed below the
Die erfindungsgemäßen Parameter können durch die Anzahl der Schichten 13 und 14, durch die Dicke der Schichten 13 und 14 und durch die Form der nicht gezeigten Poren variiert werden.The parameters according to the invention can be varied by the number of
Eine der Schichten 13 und 14 kann eine Trägerschicht sein, die für die Stabilität und Festigkeit der Oberfläche 12 sorgt. Da die Trägerschicht eine hohe Luftdurchlässigkeit hat, muss eine der Schichten 13 und 14 eine Verteilerschicht mit einer möglichst geringen Luftdurchlässigkeit sein, die sicherstellt, dass die erfindungsgemäßen Parameter eingehalten werden, und die einzelnen Luftströme E senkrecht aus der Umlenkvorrichtung 10 austreten.One of the
Wenn die Oberfläche 12 verschmutzt, beschädigt oder verschlissen ist kann sie ausgetauscht werden. Dadurch kann die Umlenkvorrichtung 10 immer einwandfrei arbeiten und muss bei der Revision der Anlage nicht komplett ausgetauscht werden.If the
Fig. 2 zeigt eine Umlenkvorrichtung 20, über welche die Faserstoffbahn 11 geführt wird. Die Umlenkvorrichtung 20 weist eine Oberfläche 21 auf, die mit Schichten 22, 23 und 24 versehen ist. Aus der Oberfläche 21 treten die einzelnen Luftströme E aus, durch welche die Faserstoffbahn 11 berührungslos über die Umlenkvorrichtung 20 geführt wird.
Die Oberfläche 21 weist einen Winkel α auf, der größer ist als ein Umschlingungswinkel β, mit dem die Faserstoffbahn 11 die Umlenkvorrichtung 20 umschlingt. Die erfindungsgemäßen Parameter gewährleisten, dass die Faserstoffbahn 11 auch dann, wenn der Umschlingungswinkel β kleiner ist als der Winkel α der Oberfläche 21, nicht die Umlenkvorrichtung 20 berührt. Der Umschlingungswinkel β kann zwischen fast 0° und mehr als 180° liegen. Insbesondere nach einem Vorhangauftragswerk ist ein Umschlingungswinkel β von mehr als 180° sinnvoll. Natürlich muss dann der Winkel α der Oberfläche 21 auch entsprechend groß sein.Fig. 2 shows a
The
Claims (16)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004032647A DE102004032647A1 (en) | 2004-07-06 | 2004-07-06 | Deflection device for non-contact deflection of a fibrous web |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1614647A1 true EP1614647A1 (en) | 2006-01-11 |
| EP1614647B1 EP1614647B1 (en) | 2010-03-17 |
Family
ID=34939593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05103547A Not-in-force EP1614647B1 (en) | 2004-07-06 | 2005-04-29 | Air turn for contactless deflecting a web of fibrous material |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1614647B1 (en) |
| AT (1) | ATE461144T1 (en) |
| DE (2) | DE102004032647A1 (en) |
| ES (1) | ES2340934T3 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007110386A3 (en) * | 2006-03-27 | 2008-07-17 | Koenig & Bauer Ag | Devices and methods for feeding a material web to a press unit of a web-fed rotary press |
| WO2011152430A1 (en) * | 2010-06-01 | 2011-12-08 | 日本ゴア株式会社 | Apparatus for change of direction of long sheet, and article floating apparatus |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991017943A1 (en) * | 1990-05-11 | 1991-11-28 | Liedtke Rudolph J | Air bearing for web material |
| US5967456A (en) * | 1995-11-08 | 1999-10-19 | Koenig & Bauer-Albert Aktiengesellschaft | Turning rod |
| EP0997419A1 (en) * | 1998-10-27 | 2000-05-03 | Spooner Industries Limited | Airbar for use in web processing |
| EP1155989A1 (en) * | 2000-05-13 | 2001-11-21 | Aradex AG | Printing press with fixed idler rollers |
| DE10322518A1 (en) * | 2003-05-19 | 2004-12-09 | Voith Paper Patent Gmbh | Air cushion guide for papermaking machine has inner hollow spar with compressed air supply surrounded by air-permeable sleeve |
| DE10339262A1 (en) * | 2003-08-26 | 2005-03-17 | Voith Paper Patent Gmbh | Web guiding means |
-
2004
- 2004-07-06 DE DE102004032647A patent/DE102004032647A1/en not_active Withdrawn
-
2005
- 2005-04-29 AT AT05103547T patent/ATE461144T1/en active
- 2005-04-29 ES ES05103547T patent/ES2340934T3/en active Active
- 2005-04-29 DE DE502005009220T patent/DE502005009220D1/en active Active
- 2005-04-29 EP EP05103547A patent/EP1614647B1/en not_active Not-in-force
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991017943A1 (en) * | 1990-05-11 | 1991-11-28 | Liedtke Rudolph J | Air bearing for web material |
| US5967456A (en) * | 1995-11-08 | 1999-10-19 | Koenig & Bauer-Albert Aktiengesellschaft | Turning rod |
| EP0997419A1 (en) * | 1998-10-27 | 2000-05-03 | Spooner Industries Limited | Airbar for use in web processing |
| EP1155989A1 (en) * | 2000-05-13 | 2001-11-21 | Aradex AG | Printing press with fixed idler rollers |
| DE10322518A1 (en) * | 2003-05-19 | 2004-12-09 | Voith Paper Patent Gmbh | Air cushion guide for papermaking machine has inner hollow spar with compressed air supply surrounded by air-permeable sleeve |
| DE10339262A1 (en) * | 2003-08-26 | 2005-03-17 | Voith Paper Patent Gmbh | Web guiding means |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007110386A3 (en) * | 2006-03-27 | 2008-07-17 | Koenig & Bauer Ag | Devices and methods for feeding a material web to a press unit of a web-fed rotary press |
| US7975608B2 (en) | 2006-03-27 | 2011-07-12 | Koenig & Bauer Aktiengesellschaft | Device and a method for feeding a material web to a printing unit of a web-fed rotary printing press |
| WO2011152430A1 (en) * | 2010-06-01 | 2011-12-08 | 日本ゴア株式会社 | Apparatus for change of direction of long sheet, and article floating apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2340934T3 (en) | 2010-06-11 |
| DE102004032647A1 (en) | 2006-02-16 |
| ATE461144T1 (en) | 2010-04-15 |
| DE502005009220D1 (en) | 2010-04-29 |
| EP1614647B1 (en) | 2010-03-17 |
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