EP1353007A1 - Blower device - Google Patents

Blower device Download PDF

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Publication number
EP1353007A1
EP1353007A1 EP03100914A EP03100914A EP1353007A1 EP 1353007 A1 EP1353007 A1 EP 1353007A1 EP 03100914 A EP03100914 A EP 03100914A EP 03100914 A EP03100914 A EP 03100914A EP 1353007 A1 EP1353007 A1 EP 1353007A1
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EP
European Patent Office
Prior art keywords
compressed air
channel
blowing device
blowing
nozzles
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.)
Granted
Application number
EP03100914A
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German (de)
French (fr)
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EP1353007B1 (en
Inventor
Joachim Dr. Grabscheid
Harald Aufrecht
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Publication of EP1353007A1 publication Critical patent/EP1353007A1/en
Application granted granted Critical
Publication of EP1353007B1 publication Critical patent/EP1353007B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0272—Wet presses in combination with suction or blowing devices

Definitions

  • the invention relates to blowing device for a machine for manufacturing and / or Refining a paper, cardboard, tissue or other fibrous web, which extends at least over the substantial part of the width of the fibrous web and several blowing nozzles arranged next to one another transversely to the web running direction owns, which are interconnected via a channel.
  • blowing devices are used in these machines to support the Guide of the fibrous web used.
  • the blown air can the direction of the fibrous web and / or the detachment of the fibrous web from one smooth roller can be affected.
  • blowing nozzles are distributed over the width of the fibrous web and can be controlled separately in sections. This is relatively expensive.
  • the blowing devices are considered to be transverse to the web running direction extending blowpipe formed, the compressed air at one end of the Blow pipe is supplied.
  • this is simple in structure, it is only allowed to a limited extent an adjustment of the pressure conditions to the conditions of the process, especially the pressure with the distance from the compressed air supply because of the exits the blow nozzle decreases. The pressure generated by the blow nozzles on the The fibrous web can thus deviate significantly from the necessary pressure curve.
  • the object of the invention is therefore that determined by the blowing nozzles To improve pressure distribution across the web direction.
  • the object was achieved in that the channel had several Compressed air feeds, viewed at right angles to the web running direction different positions are available.
  • the duct has two compressed air inlets.
  • An optimal one The pressure profile transverse to the direction of web travel results when the Compressed air supplies approximately a quarter of the length of the duct from the end of each Channel are removed.
  • the channel at least three, preferably at least 4 and in particular at least 5 Has compressed air supplies.
  • the compressed air supply should be approximately uniform over the length of the Channel. As a result, it was largely uniform Pressure curve across the width of the blowing device and thus also the fibrous web on. If necessary, the pressure curve can also be adjusted accordingly Diameters of the blow nozzles are corrected.
  • the pressure of the compressed air at least one, preferably all, compressed air supply lines can be controlled.
  • blowing device in an opening gusset between the fibrous web and a rotating, smooth roller to support the Detachment of the fibrous web is used, it is often desirable if the of the blowing nozzles directed into the gusset exerting pressure on the fibrous web in the middle is larger than at the edges.
  • the greater pressure in the middle creates an air flow to the edges and stabilizes the run of the fibrous web. This can be achieved simply by that the pressure of the compressed air supplied by the compressed air supply from the Ends of the channel increases towards the center.
  • the channel goes from one to the other Blowing tube is formed which has the blowing nozzles.
  • the pressure distribution in the duct and thus also the pressure generated by the blow nozzles can on the air pressure of the individual compressed air supply lines and / or on the Position of the compressed air supply lines can be influenced.
  • the location of at least one, preferably all Compressed air supply is adjustable crosswise to the web running direction. This can be due to can be achieved in a simple manner in that at least one transverse to the channel Movable lance is located, with one end of the lance from the Channel is led to the outside and the other end forms the compressed air supply.
  • blow nozzles each from an opening in a relatively thin wall of the Channel are formed, so the exit angle changes from the blow nozzles flowing compressed air from the two ends of the channel towards the center.
  • the compressed air is approximately perpendicular to the duct flows out of the blow nozzles or the exit angle of the blow nozzles flowing compressed air with respect to the center of the channel from the ends of the channel whose center changes in approximately the same way. So at least some should Blow nozzles influence the direction of the compressed air flowing out. To do this can reach at least some blow nozzles with a longer guide surface for Directional influence of the outgoing compressed air can be provided.
  • the outflow direction of the compressed air can also be influenced via a appropriate shape of the cross-sectional area of the blow nozzles. Therefore it can In this context, it can be advantageous if the shape of the Cross-sectional area of at least two blowing nozzles differs from one another.
  • the cross-sectional area can be at least two blowing nozzles Differentiate adaptation to the conditions of the site.
  • the cross-sectional area should the blow nozzles from the ends of the channel towards the center.
  • FIG. 1 is a press arrangement of a Paper machine for dewatering the fibrous web 1.
  • the Fibrous web 1 together with a press felt 9 by one of a roller 8 and a counter roll 7 formed press nip, the endless press felt 9th runs around the counter roller 7.
  • the fibrous web 1 After the press nip, the fibrous web 1 remains on the smooth roller 8 to Adhere to a guide roller 10. Since the guide roller 10 from the roller 8 if only because of the manufacturing tolerances and different deflections is spaced, the fibrous web 1 runs after detaching from the roller 8 unsupported to the guide roll 10. The fibrous web 1 then passes from the guide roll 10 to a subsequent unit, for example a further press arrangement or a Drying group for drying the fibrous web 1.
  • This negative pressure causes the inflow of Air into the gusset, causing the edge to flutter and consequently to in or out tearing of the fibrous web 1 can even come.
  • the strong adhesion the fibrous web 1 on the smooth roller 8 also lead to tears or tears.
  • the smooth surface of the roller 8 is made by the direct contact of the Fibrous web 1 required during passage through the press nip.
  • the web run side gusset between the roller 8 and the fibrous web 1 one in the Gusset-oriented blowing device in the form of a cross-machine direction extending blow pipe 3 with blow nozzles 5.
  • the blow pipe 3 forms at the same time the channel 11 connecting the blowing nozzles 5 and extends over the entire Width of the fibrous web 1.
  • Figure 3 shows the pressure curve in channel 11 and thus also in the gusset.
  • the pressure decreases from the compressed air supply 4, which results from the outlets through the blow nozzles 5 results.
  • the compressed air feeds 4 are about a quarter of the Length of the channel 11 from the corresponding end of the channel 11. This results in a relatively balanced, symmetrical pressure curve.
  • the blowing device in Figure 4 is also designed as a blowing tube 3, here it however, there are four compressed air supply lines 4, which are largely uniform over the Length of the channel 11 are arranged distributed.
  • the air pressure is the Compressed air supply 4 controllable. This enables an even better design of the Pressure curve according to the specific requirements, as can be seen in Figure 5 is.
  • the pressure curve can be even more even and in the middle Make the area thicker than at the edges of the fibrous web 1.
  • FIG. 6 there is a blow pipe 3 which extends through the blow pipe 3 Compressed air tube 12 with several compressed air supply lines 4 in the form of nozzles. About these Nozzles the compressed air from the compressed air pipe 12 into the channel 11 of the blow pipe 3 and from there via the blow nozzles 5 into the gusset.
  • the three nozzles of the compressed air tube 12 are distributed over the length of the blow tube 3 and have a distance here that is about a quarter of the length of the blowpipe 3 equivalent. This serves to even out the pressure curve in the gusset, like the figure 7 shows.
  • FIG. 8 shows one possibility of the outflow direction from the blowing nozzles 5 to influence escaping compressed air. This is what happens when producing a Opening the wall 13 of the channel 11 from the wall 13 by punching, Burning or the like partially loosened guide part 14 bent into the channel 11. This Guide part 14 influences the flow in the channel 11 and in the blowing nozzle 5.
  • a selection can be made according to the requirements for the blowing nozzle 5 in question respectively.

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  • Paper (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Abstract

The blower tube (3) to support the movement of a web, at a machine for the production or finishing of paper or cardboard or tissue, has a number of blower jets (5) aligned across the direction of web travel. The jets are interconnected by a channel (11), with a number of compressed air feeds (4) in moving lances (6) at different points across the web travel line, to set and equalize the jet air streams.

Description

Die Erfindung betrifft Blasvorrichtung für eine Maschine zur Herstellung und/oder Veredlung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn, welche sich zumindest über den wesentlichen Teil der Breite der Faserstoffbahn erstreckt und quer zur Bahnlaufrichtung mehrere nebeneinander angeordnete Blasdüsen besitzt, die über einen Kanal miteinander verbunden sind.The invention relates to blowing device for a machine for manufacturing and / or Refining a paper, cardboard, tissue or other fibrous web, which extends at least over the substantial part of the width of the fibrous web and several blowing nozzles arranged next to one another transversely to the web running direction owns, which are interconnected via a channel.

Derartige Blasvorrichtungen werden in diesen Maschinen zur Unterstützung bei der Führung der Faserstoffbahn eingesetzt. Dabei kann über die Blasluft insbesondere die Richtung der Faserstoffbahn und/oder das Ablösen der Faserstoffbahn von einer glatten Walze beeinflusst werden.Such blowing devices are used in these machines to support the Guide of the fibrous web used. In particular, the blown air can the direction of the fibrous web and / or the detachment of the fibrous web from one smooth roller can be affected.

Bei einer Lösung sind mehrere Blasdüsen über die Breite der Faserstoffbahn verteilt und sektionsweise separat steuerbar. Dies ist relativ aufwendig.In one solution, several blowing nozzles are distributed over the width of the fibrous web and can be controlled separately in sections. This is relatively expensive.

Überwiegend werden die Blasvorrichtungen jedoch als quer zur Bahnlaufrichtung verlaufendes Blasrohr ausgebildet, wobei die Druckluft an einem Ende des Blasrohres zugeführt wird. Dies ist zwar einfach im Aufbau, erlaubt aber nur begrenzt eine Anpassung der Druckverhältnisse an die Gegebenheiten des Prozesses, zumal der Druck mit der Entfernung von der Druckluftzuführung wegen der Abgänge über die Blasdüsen abnimmt. Der von den Blasdüsen erzeugte Druck auf die Faserstoffbahn kann so erheblich von dem notwendigen Druckverlauf abweichen.Mostly, however, the blowing devices are considered to be transverse to the web running direction extending blowpipe formed, the compressed air at one end of the Blow pipe is supplied. Although this is simple in structure, it is only allowed to a limited extent an adjustment of the pressure conditions to the conditions of the process, especially the pressure with the distance from the compressed air supply because of the exits the blow nozzle decreases. The pressure generated by the blow nozzles on the The fibrous web can thus deviate significantly from the necessary pressure curve.

Die Aufgabe der Erfindung ist es daher die von den Blasdüsen bestimmte Druckverteilung quer zur Bahnlaufrichtung zu verbessern.The object of the invention is therefore that determined by the blowing nozzles To improve pressure distribution across the web direction.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass der Kanal mehrere Druckluftzuführungen aufweist, die quer zur Bahnlaufrichtung betrachtet an unterschiedlichen Stellen vorhanden sind. According to the invention, the object was achieved in that the channel had several Compressed air feeds, viewed at right angles to the web running direction different positions are available.

Dies führt auf einfache Weise zu einer Vergleichmäßigung der Druckverhältnisse im Kanal und somit auch zu einer Vergleichmäßigung des von den Blasdüsen erzeugten Druckes auf die Faserstoffbahn zumindest quer zur Bahnlaufrichtung.This leads in a simple manner to an equalization of the pressure conditions in the Channel and thus also to make the blow nozzles more uniform Pressure on the fibrous web at least transversely to the web running direction.

In Abhängigkeit von den Anforderungen und der Breite der Faserstoffbahn kann es durchaus genügen, wenn der Kanal zwei Druckluftzuführungen besitzt. Ein optimaler Druckverlauf quer zur Bahnlaufrichtung ergibt sich dabei, wenn die Druckluftzuführungen etwa ein Viertel der Länge des Kanals vom jeweiligen Ende des Kanals entfernt sind.Depending on the requirements and the width of the fibrous web, it can it is quite sufficient if the duct has two compressed air inlets. An optimal one The pressure profile transverse to the direction of web travel results when the Compressed air supplies approximately a quarter of the length of the duct from the end of each Channel are removed.

Besonders für sehr breite Faserstoffbahnen und/oder besondere Anforderungen an eine stabile Führung der Faserstoffbahn ist es jedoch von Vorteil, wenn der Kanal zumindest drei, vorzugsweise wenigstens 4 und insbesondere mindestens 5 Druckluftzuführungen hat.Especially for very wide fibrous webs and / or special requirements stable guidance of the fibrous web, however, it is advantageous if the channel at least three, preferably at least 4 and in particular at least 5 Has compressed air supplies.

Dabei sollten die Druckluftzuführungen annähernd gleichmäßig über die Länge des Kanals verteilt sein. Als Folge stellte sich ein weitestgehend gleichmäßiger Druckverlauf über die Breite der Blasvorrichtung und damit auch der Faserstoffbahn ein. Falls erforderlich kann der Druckverlauf zusätzlich auch über entsprechende Durchmesser der Blasdüsen korrigiert werden.The compressed air supply should be approximately uniform over the length of the Channel. As a result, it was largely uniform Pressure curve across the width of the blowing device and thus also the fibrous web on. If necessary, the pressure curve can also be adjusted accordingly Diameters of the blow nozzles are corrected.

Beeinflussungsmöglichkeiten zur Veränderung des Druckverlaufs ergeben sich auch dadurch, dass die Druckluftzuführungen Druckluft mit unterschiedlichen Drücken zuführen.There are also options for influencing the change in the pressure curve in that the compressed air supply lines compressed air with different pressures respectively.

Zur Anpassung an sich verändernde Bahngeschwindigkeiten oder Parameter der Faserstoffbahn kann es auch von Vorteil sein, wenn der Druck der Druckluft zumindest einer, vorzugsweise aller Druckluftzuführungen steuerbar ist.To adapt to changing web speeds or parameters of the Fibrous web can also be advantageous if the pressure of the compressed air at least one, preferably all, compressed air supply lines can be controlled.

Insbesondere wenn die Blasvorrichtung in einem sich öffnenden Zwickel zwischen der Faserstoffbahn und einer rotierenden, glatten Walze zur Unterstützung des Ablösens der Faserstoffbahn zum Einsatz kommt, ist es oft erwünscht, wenn der von den in den Zwickel gerichteten Blasdüsen ausgehende Druck auf die Faserstoffbahn in deren Mitte größer ist als an den Rändern.Especially when the blowing device in an opening gusset between the fibrous web and a rotating, smooth roller to support the Detachment of the fibrous web is used, it is often desirable if the of the blowing nozzles directed into the gusset exerting pressure on the fibrous web in the middle is larger than at the edges.

Der größere Druck in der Mitte erzeugt eine Luftströmung zu den Rändern und stabilisiert den Lauf der Faserstoffbahn. Erreicht werden kann dies einfach dadurch, dass der Druck der von den Druckluftzuführungen zugeführten Druckluft von den Enden des Kanals zu dessen Mitte hin zunimmt.The greater pressure in the middle creates an air flow to the edges and stabilizes the run of the fibrous web. This can be achieved simply by that the pressure of the compressed air supplied by the compressed air supply from the Ends of the channel increases towards the center.

Konstruktive Vorteile ergeben sich, falls der Kanal von einem quer zur Bahnlaufrichtung verlaufenden Blasrohr gebildet wird, welches die Blasdüsen besitzt. Die Druckverteilung im Kanal und damit auch der von den Blasdüsen erzeugte Druck können über den Luftdruck der einzelnen Druckluftzuleitungen und/oder über die Lage der Druckluftzuleitungen beeinflusst werden.There are constructive advantages if the channel goes from one to the other Blowing tube is formed which has the blowing nozzles. The pressure distribution in the duct and thus also the pressure generated by the blow nozzles can on the air pressure of the individual compressed air supply lines and / or on the Position of the compressed air supply lines can be influenced.

Es ist daher von Vorteil, wenn die Lage zumindest einer, vorzugsweise aller Druckluftzuführungen quer zur Bahnlaufrichtung verstellbar ist. Dies kann auf einfache Weise dadurch erreicht werden, dass sich im Kanal zumindest eine quer zur Bahnlaufrichtung verschiebbare Lanze befindet, wobei ein Ende der Lanze aus dem Kanal nach außen geführt ist und das andere Ende die Druckluftzuführung bildet.It is therefore advantageous if the location of at least one, preferably all Compressed air supply is adjustable crosswise to the web running direction. This can be due to can be achieved in a simple manner in that at least one transverse to the channel Movable lance is located, with one end of the lance from the Channel is led to the outside and the other end forms the compressed air supply.

Falls die Blasdüsen jeweils von einer Öffnung in einer relativ dünnen Wand des Kanals gebildet werden, so verändert sich der Austrittswinkel der aus den Blasdüsen strömenden Druckluft von den beiden Enden des Kanals zu dessen Mitte hin.If the blow nozzles each from an opening in a relatively thin wall of the Channel are formed, so the exit angle changes from the blow nozzles flowing compressed air from the two ends of the channel towards the center.

In der Regel ist es jedoch von Vorteil, wenn die Druckluft etwa senkrecht zum Kanal aus den Blasdüsen strömt oder sich der Austrittswinkel der aus den Blasdüsen strömenden Druckluft bezüglich der Mitte des Kanals von den Enden des Kanals zu dessen Mitte etwa in gleicher Weise ändert. Daher sollten zumindest einige Blasdüsen die Richtung der ausströmenden Druckluft beeinflussen. Um dies zu erreichen können zumindest einige Blasdüsen mit einer längeren Führungsfläche zur Richtungsbeeinflussung der ausströmenden Druckluft versehen werden.As a rule, however, it is advantageous if the compressed air is approximately perpendicular to the duct flows out of the blow nozzles or the exit angle of the blow nozzles flowing compressed air with respect to the center of the channel from the ends of the channel whose center changes in approximately the same way. So at least some should Blow nozzles influence the direction of the compressed air flowing out. To do this can reach at least some blow nozzles with a longer guide surface for Directional influence of the outgoing compressed air can be provided.

Konstruktiv einfacher ist es jedoch, Teile der Wandung des Kanals, die bei der Herstellung einer entsprechenden Öffnung in der Wandung des Kanals entfernt werden müßten, aus oder in den Kanal zu biegen. Diese Teile können dann als Führungsflächen für die ausströmende Druckluft dienen.However, it is structurally simpler to use parts of the wall of the channel that are used in the Making a corresponding opening in the wall of the channel removed would have to bend out of or into the canal. These parts can then be used as Guide surfaces for the outgoing compressed air serve.

Eine Beeinflussung der Ausströmrichtung der Druckluft kann auch über eine entsprechende Form der Querschnittsfläche der Blasdüsen erfolgen. Daher kann es in diesem Zusammenhang von Vorteil sein, wenn sich die Form der Querschnittsfläche zumindest zweier Blasdüsen voneinander unterscheidet.The outflow direction of the compressed air can also be influenced via a appropriate shape of the cross-sectional area of the blow nozzles. Therefore it can In this context, it can be advantageous if the shape of the Cross-sectional area of at least two blowing nozzles differs from one another.

Allgemein kann sich die Querschnittsfläche zumindest zweier Blasdüsen zur Anpassung an die Gegebenheiten des Einsatzortes voneinander unterscheiden.In general, the cross-sectional area can be at least two blowing nozzles Differentiate adaptation to the conditions of the site.

Eine Beeinflussung der Menge an ausströmender Druckluft ist dabei dadurch möglich, dass sich zumindest die Größe der Querschnittsfläche zumindest zweier Blasdüsen voneinander unterscheidet.This affects the amount of compressed air flowing out possible that at least the size of the cross-sectional area of at least two Blow nozzles different from each other.

Wegen des erhöhten Druckluftbedarfs in der Bahnmitte sollte die Querschnittsfläche der Blasdüsen von den Enden des Kanals zu dessen Mitte hin zunehmen.Because of the increased compressed air requirement in the middle of the web, the cross-sectional area should the blow nozzles from the ends of the channel towards the center.

Nachfolgend soll die Erfindung an mehreren Ausführungsbeispielen näher erläutert werden. In den beigefügten Zeichnungen zeigt:

Figur 1:
einen schematischen Querschnitt durch Pressanordnung mit Blasrohr 3,
Figur 2:
einen schematischen Querschnitt durch ein Blasrohr 3 mit zwei Druckluftzuführungen 4,
Figur 3:
den Druckverlauf im Zwickel gemäß Figur 2,
Figur 4:
einen schematischen Querschnitt durch ein Blasrohr 3 mit vier Druckluftzuführungen 4
Figur 5:
den Druckverlauf im Zwickel gemäß Figur 4.
Figur 6:
einen schematischen Querschnitt durch ein Blasrohr 3 mit einem Druckluftrohr 12,
Figur 7:
den Druckverlauf im Zwickel gemäß Figur 6,
Figur 8:
einen Ausschnitt der Wandung des Kanals 11 mit Blasdüse 5 und
Figur 9:
verschiedene Querschnittsformen der Blasdüsen 5.
The invention will be explained in more detail below using several exemplary embodiments. In the accompanying drawings:
Figure 1:
2 shows a schematic cross section through a press arrangement with a blow pipe 3,
Figure 2:
2 shows a schematic cross section through a blow pipe 3 with two compressed air supply lines 4,
Figure 3:
the pressure profile in the gusset according to Figure 2,
Figure 4:
a schematic cross section through a blow pipe 3 with four compressed air supply lines 4th
Figure 5:
the pressure curve in the gusset according to Figure 4.
Figure 6:
2 shows a schematic cross section through a blow pipe 3 with a compressed air pipe 12,
Figure 7:
the pressure curve in the gusset according to Figure 6,
Figure 8:
a section of the wall of the channel 11 with blowing nozzle 5 and
Figure 9:
different cross-sectional shapes of the blowing nozzles 5.

Bei dem in Figur 1 gezeigten Beispiel handelt es sich um eine Pressanordnung einer Papiermaschine zur Entwässerung der Faserstoffbahn 1. Dabei wird die Faserstoffbahn 1 gemeinsam mit einem Pressfilz 9 durch einen von einer Walze 8 und einer Gegenwalze 7 gebildeten Pressspalt geführt, wobei der endlose Pressfilz 9 um die Gegenwalze 7 läuft.The example shown in FIG. 1 is a press arrangement of a Paper machine for dewatering the fibrous web 1. The Fibrous web 1 together with a press felt 9 by one of a roller 8 and a counter roll 7 formed press nip, the endless press felt 9th runs around the counter roller 7.

Nach dem Pressspalt bleibt die Faserstoffbahn 1 an der glatten Walze 8 bis zur Weiterführung an eine Leitwalze 10 haften. Da die Leitwalze 10 von der Walze 8 schon wegen der Fertigungstoleranzen sowie unterschiedlicher Durchbiegungen beabstandet ist, läuft die Faserstoffbahn 1 nach dem Ablösen von der Walze 8 ungestützt zur Leitwalze 10. Von der Leitwalze 10 gelangt die Faserstoffbahn 1 dann zu einer folgenden Einheit, beispielsweise einer weiteren Pressanordnung oder einer Trockengruppe zur Trocknung der Faserstoffbahn 1.After the press nip, the fibrous web 1 remains on the smooth roller 8 to Adhere to a guide roller 10. Since the guide roller 10 from the roller 8 if only because of the manufacturing tolerances and different deflections is spaced, the fibrous web 1 runs after detaching from the roller 8 unsupported to the guide roll 10. The fibrous web 1 then passes from the guide roll 10 to a subsequent unit, for example a further press arrangement or a Drying group for drying the fibrous web 1.

Insbesondere bei leichten und feuchten Faserstoffbahnen 1 sowie hohen Bahngeschwindigkeiten ist die Abnahme der Faserstoffbahn 1 von der glatten Walze 8 und der sich anschließende ungestützte Lauf zur Leitwalze 10 sehr problematisch.Especially with light and moist fibrous webs 1 and high Web speeds is the decrease in the fibrous web 1 from the smooth roll 8 and the subsequent unsupported run to the guide roller 10 very problematic.

Der Grund liegt in dem sich im öffnenden Zwickel zwischen der Faserstoffbahn 1 und der Walze 8 aufbauenden Unterdruck. Dieser Unterdruck bewirkt das Einströmen von Luft in den Zwickel hinein, wobei es zum Flattern des Randes und infolge zu Ein- oder gar Abrissen der Faserstoffbahn 1 kommen kann. Außerdem kann die starke Haftung der Faserstoffbahn 1 an der glatten Walze 8 ebenfalls zu Ein- oder Abrissen führen. Die glatte Oberfläche der Walze 8 macht sich durch den direkten Kontakt der Faserstoffbahn 1 während des Durchlaufens des Pressspaltes erforderlich.The reason lies in the opening in the gusset between the fibrous web 1 and the roller 8 building negative pressure. This negative pressure causes the inflow of Air into the gusset, causing the edge to flutter and consequently to in or out tearing of the fibrous web 1 can even come. In addition, the strong adhesion the fibrous web 1 on the smooth roller 8 also lead to tears or tears. The smooth surface of the roller 8 is made by the direct contact of the Fibrous web 1 required during passage through the press nip.

Um den Unterdruck und damit der Luftströmung entgegenzuwirken, befindet sich im bahnlaufseitigen Zwickel zwischen der Walze 8 und der Faserstoffbahn 1 eine in den Zwickel gerichtete Blasvorrichtung in Form eines quer zur Bahnlaufrichtung verlaufenden Blasrohres 3 mit Blasdüsen 5. Das Blasrohr 3 bildet dabei gleichzeitig den die Blasdüsen 5 verbindenden Kanal 11 und erstreckt sich über die gesamte Breite der Faserstoffbahn 1.In order to counteract the negative pressure and thus the air flow, is in the web run side gusset between the roller 8 and the fibrous web 1 one in the Gusset-oriented blowing device in the form of a cross-machine direction extending blow pipe 3 with blow nozzles 5. The blow pipe 3 forms at the same time the channel 11 connecting the blowing nozzles 5 and extends over the entire Width of the fibrous web 1.

Gemäß Figur 2 ist an beiden Enden des Blasrohres 3 je eine quer zur Bahnlaufrichtung 2 verschiebbare Lanze 6 in das Blasrohr 3 und damit den Kanal 11 geführt. Die Lanzen 6 besitzen an ihrem kanalseitigen Ende die Druckluftzuführung 4 in Form einer Öffnung in der Lanze 6. Dies ermöglicht die Zuführung der Druckluft von außen über die Lanze 6 in den Kanal 11.According to Figure 2 is at both ends of the blowpipe 3 each across Web running direction 2 displaceable lance 6 into the blow pipe 3 and thus the channel 11 guided. The lances 6 have the compressed air supply 4 at their channel end in the form of an opening in the lance 6. This enables the supply of compressed air from the outside via lance 6 into channel 11.

Figur 3 zeigt den Druckverlauf im Kanal 11 und somit auch im Zwickel. Der Druck nimmt dabei von den Druckluftzuführungen 4 aus ab, was sich aus den Abgängen über die Blasdüsen 5 ergibt. Die Druckluftzuführungen 4 sind etwa ein Viertel der Länge des Kanals 11 von dem entsprechenden Ende des Kanals 11 entfernt. Hierdurch ergibt sich ein relativ ausgeglichener symmetrischer Druckverlauf.Figure 3 shows the pressure curve in channel 11 and thus also in the gusset. The pressure decreases from the compressed air supply 4, which results from the outlets through the blow nozzles 5 results. The compressed air feeds 4 are about a quarter of the Length of the channel 11 from the corresponding end of the channel 11. This results in a relatively balanced, symmetrical pressure curve.

Die Blasvorrichtung in Figur 4 ist ebenfalls als Blasrohr 3 ausgebildet, wobei es hier jedoch vier Druckluftzuführungen 4 gibt, welche weitestgehend gleichmäßig über die Länge des Kanals 11 verteilt angeordnet sind. Außerdem ist der Luftdruck der Druckluftzuführungen 4 steuerbar. Dies ermöglicht eine noch bessere Gestaltung des Druckverlaufs entsprechend den spezifischen Anforderungen, wie in Figur 5 zu sehen ist. Der Druckverlauf lässt sich noch weiter vergleichmäßigen und im mittleren Bereich stärker als an den Rändern der Faserstoffbahn 1 ausbilden.The blowing device in Figure 4 is also designed as a blowing tube 3, here it however, there are four compressed air supply lines 4, which are largely uniform over the Length of the channel 11 are arranged distributed. In addition, the air pressure is the Compressed air supply 4 controllable. This enables an even better design of the Pressure curve according to the specific requirements, as can be seen in Figure 5 is. The pressure curve can be even more even and in the middle Make the area thicker than at the edges of the fibrous web 1.

In Figur 6 befindet sich im Blasrohr 3 ein, sich durch das Blasrohr 3 erstreckendes Druckluftrohr 12 mit mehreren Druckluftzuführungen 4 in Form von Düsen. Über diese Düsen gelangt die Druckluft aus dem Druckluftrohr 12 in den Kanal 11 des Blasrohres 3 und von dort über die Blasdüsen 5 in den Zwickel.In FIG. 6 there is a blow pipe 3 which extends through the blow pipe 3 Compressed air tube 12 with several compressed air supply lines 4 in the form of nozzles. About these Nozzles the compressed air from the compressed air pipe 12 into the channel 11 of the blow pipe 3 and from there via the blow nozzles 5 into the gusset.

Die drei Düsen des Druckluftrohres 12 sind über die Länge des Blasrohres 3 verteilt und haben hier einen Abstand, der etwa einem Viertel der Länge des Blasrohres 3 entspricht. Dies dient der Vergleichmäßigung des Druckverlaufs im Zwickel, wie Figur 7 zeigt.The three nozzles of the compressed air tube 12 are distributed over the length of the blow tube 3 and have a distance here that is about a quarter of the length of the blowpipe 3 equivalent. This serves to even out the pressure curve in the gusset, like the figure 7 shows.

Figur 8 zeigt eine Möglichkeit die Ausströmrichtung die aus den Blasdüsen 5 austretende Druckluft zu beeinflussen. Hierzu wird das, bei der Herstellung einer Öffnung der Wandung 13 des Kanals 11 aus der Wandung 13 durch Stanzen, Brennen o. ä. teilweise gelöste Führungsteil 14 in den Kanal 11 gebogen. Dieses Führungsteil 14 beeinflußt die Strömung im Kanal 11 und in der Blasdüse 5.FIG. 8 shows one possibility of the outflow direction from the blowing nozzles 5 to influence escaping compressed air. This is what happens when producing a Opening the wall 13 of the channel 11 from the wall 13 by punching, Burning or the like partially loosened guide part 14 bent into the channel 11. This Guide part 14 influences the flow in the channel 11 and in the blowing nozzle 5.

Die Figuren 9 a - f zeigen verschiedene Qierschnittsformen der Blasdüsen 5 zur Beeinflussung von Menge und/oder Ausströmung der Druckluft. Dabei ist die Querschnittsform wie folgt gekennzeichnet:

  • a: Viereck + Halbkreis
  • b: Halbkreis
  • c: Kreis
  • d: Viereck
  • e: länglich in Strömungsrichtung im Kanal 11
  • f: Kreissektor
    • FIGS. 9 a - f show different cross-sectional shapes of the blowing nozzles 5 for influencing the quantity and / or outflow of the compressed air. The cross-sectional shape is identified as follows:
  • a: square + semicircle
  • b: semicircle
  • c: circle
  • d: square
  • e: elongated in the direction of flow in channel 11
  • f: circular sector

    • Eine Auswahl kann entsprechend der Anforderungen an die betreffende Blasdüse 5 erfolgen.A selection can be made according to the requirements for the blowing nozzle 5 in question respectively.

    Claims (19)

    Blasvorrichtung für eine Maschine zur Herstellung und/oder Veredlung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn (1), welche sich zumindest über den wesentlichen Teil der Breite der Faserstoffbahn (1) erstreckt und quer zur Bahnlaufrichtung (2) mehrere nebeneinander angeordnete Blasdüsen (5) besitzt, die über einen Kanal (11) miteinander verbunden sind, dadurch gekennzeichnet, dass der Kanal (11) mehrere Druckluftzuführungen (4) aufweist, die quer zur Bahnlaufrichtung (2) betrachtet an unterschiedlichen Stellen vorhanden sind.Blowing device for a machine for producing and / or finishing a paper, cardboard, tissue or other fibrous web (1), which extends at least over the substantial part of the width of the fibrous web (1) and several across the web running direction (2) has jets (5) arranged next to one another, which are connected to one another via a channel (11), characterized in that the channel (11) has a plurality of compressed air inlets (4) which, viewed transversely to the web running direction (2), are present at different points. Blasvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Kanal (11) zwei Druckluftzuführungen (4) besitzt.Blowing device according to claim 1, characterized in that the channel (11) has two compressed air feeds (4). Blasvorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Druckluftzuführungen (4) etwa ein Viertel der Länge des Kanals (11) vom jeweiligen Ende des Kanals (11) entfernt sind.Blowing device according to claim 2, characterized in that the compressed air feeds (4) are about a quarter of the length of the channel (11) from the respective end of the channel (11). Blasvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Kanal (11) zumindest drei, vorzugsweise wenigstens 4 und insbesondere mindestens 5 Druckluftzuführungen (4) hat.Blowing device according to claim 1, characterized in that the channel (11) has at least three, preferably at least 4 and in particular at least 5 compressed air feeds (4). Blasvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Druckluftzuführungen (4) annähernd gleichmäßig über die Länge des Kanals (11) verteilt sind.Blowing device according to claim 4, characterized in that the compressed air supply lines (4) are distributed approximately uniformly over the length of the channel (11). Blasvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Druckluftzuführungen (4) Druckluft mit unterschiedlichen Drücken zuführen. Blowing device according to one of the preceding claims, characterized in that the compressed air feeds (4) feed compressed air at different pressures. Blasvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Druck der Druckluft zumindest einer, vorzugsweise aller Druckluftzuführungen (4) steuerbar ist.Blowing device according to one of the preceding claims, characterized in that the pressure of the compressed air of at least one, preferably all, compressed air supply lines (4) can be controlled. Blasvorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass der Druck der von den Druckluftzuführungen (4) zugeführten Druckluft von den Enden des Kanals (11) zu dessen Mitte hin zunimmt.Blowing device according to claim 6 or 7, characterized in that the pressure of the compressed air supplied by the compressed air feeds (4) increases from the ends of the channel (11) towards the center thereof. Blasvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Kanal (11) von einem quer zur Bahnlaufrichtung (2) verlaufenden Blasrohr (3) gebildet wird, welches die Blasdüsen (5) besitzt.Blowing device according to one of the preceding claims, characterized in that the channel (11) is formed by a blowing tube (3) which runs transversely to the web running direction (2) and which has the blowing nozzles (5). Blasvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Lage zumindest einer, vorzugsweise aller Druckluftzuführungen (4) quer zur Bahnlaufrichtung (2) verstellbar ist.Blowing device according to one of the preceding claims, characterized in that the position of at least one, preferably all, compressed air feeds (4) is adjustable transversely to the web running direction (2). Blasvorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass sich im Kanal (11) zumindest eine quer zur Bahnlaufrichtung (2) verschiebbare Lanze (6) befindet, wobei ein Ende der Lanze (6) aus dem Kanal (11) nach außen geführt ist und das andere Ende die Druckluftzuführung (4) bildet.Blowing device according to claim 10, characterized in that there is at least one lance (6) which can be displaced transversely to the web running direction (2) in the channel (11), one end of the lance (6) being guided out of the channel (11) and that the other end forms the compressed air supply (4). Blasvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    sich die Querschnittsfläche zumindest zweier Blasdüsen (5) voneinander unterscheidet.    Blowing device according to one of the preceding claims, characterized in that
    the cross-sectional area of at least two blowing nozzles (5) differs from one another.         Blasvorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass
    sich zumindest die Größe der Querschnittsfläche zumindest zweier Blasdüsen (5) voneinander unterscheidet.    Blowing device according to claim 11, characterized in that
    at least the size of the cross-sectional area of at least two blowing nozzles (5) differs from one another.         Blasvorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass
    die Querschnittsfläche der Blasdüsen (5) von den Enden des Kanals (11) zu dessen Mitte hin zunimmt.    Blowing device according to claim 13, characterized in that
    the cross-sectional area of the blowing nozzles (5) increases from the ends of the channel (11) towards the center thereof.         Blasvorrichtung nach einem der Ansprüche 12 bis 14, dadurch gekennzeichnet, dass
    sich die Form der Querschnittsfläche zumindest zweier Blasdüsen (5) voneinander unterscheidet.    Blowing device according to one of claims 12 to 14, characterized in that
    the shape of the cross-sectional area of at least two blowing nozzles (5) differs from one another.         Blasvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    zumindest einige Blasdüsen (5) die Richtung der ausströmenden Druckluft beeinflussen.    Blowing device according to one of the preceding claims, characterized in that
    at least some blowing nozzles (5) influence the direction of the compressed air flowing out.         Blasvorrichtung nach Anspruch 16, dadurch gekennzeichnet, dass
    die Druckluft etwa senkrecht zum Kanal (11) aus den Blasdüsen (5) strömt.    Blowing device according to claim 16, characterized in that
    the compressed air flows approximately perpendicular to the channel (11) from the blowing nozzles (5).         Blasvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    sich der Austrittswinkel der aus den Blasdüsen (5) strömenden Druckluft bezüglich der Mitte des Kanals (11) von den Enden des Kanals (11) zu dessen Mitte etwa in gleicher Weise ändert.    Blowing device according to one of the preceding claims, characterized in that
    the outlet angle of the compressed air flowing from the blowing nozzles (5) changes approximately in the same way with respect to the center of the channel (11) from the ends of the channel (11) to the center thereof.         Blasvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    Blasdüsen (5) in den sich öffnenden Zwickel zwischen der Faserstoffbahn (1) und einer rotierenden, glatten Walze (8) gerichtet sind.    Blowing device according to one of the preceding claims, characterized in that
    Blowing nozzles (5) are directed into the opening gusset between the fibrous web (1) and a rotating, smooth roller (8).
    EP03100914A 2002-04-11 2003-04-07 Blower device Expired - Lifetime EP1353007B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10215892A DE10215892A1 (en) 2002-04-11 2002-04-11 Blowing device for a machine for producing and / or finishing a fibrous web
    DE10215892 2002-04-11

    Publications (2)

    Publication Number Publication Date
    EP1353007A1 true EP1353007A1 (en) 2003-10-15
    EP1353007B1 EP1353007B1 (en) 2007-04-04

    Family

    ID=28051243

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP03100914A Expired - Lifetime EP1353007B1 (en) 2002-04-11 2003-04-07 Blower device

    Country Status (3)

    Country Link
    EP (1) EP1353007B1 (en)
    AT (1) ATE358745T1 (en)
    DE (2) DE10215892A1 (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN102199893A (en) * 2011-01-11 2011-09-28 河南卷烟工业烟草薄片有限公司 Novel paper leading tool close to vat

    Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US1746431A (en) * 1928-03-19 1930-02-11 Kolitsch August Drying apparatus
    US4836894A (en) * 1982-09-30 1989-06-06 Beloit Corporation Profiling air/steam system for paper-making machines
    WO2001012898A1 (en) * 1999-08-12 2001-02-22 Runtech Systems Oy Method and apparatus for the treatment of a material web and for control of the behavior of a material web
    EP1156154A2 (en) * 2000-05-17 2001-11-21 Voith Paper Patent GmbH Apparatus for making a material web
    DE10144626A1 (en) * 2000-10-02 2002-05-23 Metso Paper Inc System to remove extracted water from a ridged roller, at a papermaking machine, has air guides at the jet unit to direct the compressed air at the roller surface to detach the water and lead it off

    Family Cites Families (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FI104646B (en) * 1998-07-03 2000-03-15 Valmet Corp Device and method for conducting a paper / cardboard web to a pulp solver

    Patent Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US1746431A (en) * 1928-03-19 1930-02-11 Kolitsch August Drying apparatus
    US4836894A (en) * 1982-09-30 1989-06-06 Beloit Corporation Profiling air/steam system for paper-making machines
    WO2001012898A1 (en) * 1999-08-12 2001-02-22 Runtech Systems Oy Method and apparatus for the treatment of a material web and for control of the behavior of a material web
    EP1156154A2 (en) * 2000-05-17 2001-11-21 Voith Paper Patent GmbH Apparatus for making a material web
    DE10144626A1 (en) * 2000-10-02 2002-05-23 Metso Paper Inc System to remove extracted water from a ridged roller, at a papermaking machine, has air guides at the jet unit to direct the compressed air at the roller surface to detach the water and lead it off

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN102199893A (en) * 2011-01-11 2011-09-28 河南卷烟工业烟草薄片有限公司 Novel paper leading tool close to vat
    CN102199893B (en) * 2011-01-11 2013-05-08 河南卷烟工业烟草薄片有限公司 Novel paper leading tool close to vat

    Also Published As

    Publication number Publication date
    DE50306946D1 (en) 2007-05-16
    DE10215892A1 (en) 2003-10-23
    ATE358745T1 (en) 2007-04-15
    EP1353007B1 (en) 2007-04-04

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