EP0298299B1 - Device for the contactless guiding of webs - Google Patents
Device for the contactless guiding of webs Download PDFInfo
- Publication number
- EP0298299B1 EP0298299B1 EP88109878A EP88109878A EP0298299B1 EP 0298299 B1 EP0298299 B1 EP 0298299B1 EP 88109878 A EP88109878 A EP 88109878A EP 88109878 A EP88109878 A EP 88109878A EP 0298299 B1 EP0298299 B1 EP 0298299B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- material web
- blowing
- nozzle
- flow deflecting
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
- D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/18—Drying webs by hot air
- D21F5/185—Supporting webs in hot air dryers
- D21F5/187—Supporting webs in hot air dryers by air jets
- D21F5/188—Blowing devices
Definitions
- the invention relates to a device for contactless guiding of material webs with at least two blowing nozzles arranged one behind the other in the running direction of the material web and extending transversely to it and designed as slots or rows of holes, the blowing jets of which are directed in the same direction and obliquely against the material web and on the side facing the material web are guided by flow guide bodies, of which the flow guide body adjoining the blowing nozzle rearward in the running direction of the material web is convexly curved toward the material web.
- Such overflowed wings together with the material web form Venturi diffusers, the material web being caused to flutter by the Bernoulli effect.
- the flutter can be suppressed by special measures, for example by a perforation in the wing, since additional air flowing in then allows the flow to remain on the material web, or by wing suction, since then the Flow only remains on the wing.
- Such one-sided flows also arise in exceptional cases if the material web tension and the material weight on the one hand and the wing shape and wing overflow on the other hand are coordinated. However, keeping them clean and free movement in the production of a paper machine generally does not permit the above measures or the conditions for clear flow conditions. Because with a Venturi diffuser the narrowest point between the material web and the wing back changes depending on the conditions, flapping cannot be avoided and safety against contact cannot be achieved.
- the flow guide between the convexly curved flow guide of the rear blowing nozzle and the front blowing nozzle runs essentially parallel to the material web.
- the surface of the parallel flow guide body can be roughened, in particular have corrugations. No special precautions have been taken to prevent the material web from fluttering. There is therefore a risk that the material web will strike (DT 19 54 880 B2).
- the invention has for its object to provide a device for contactless guiding of material webs of the type mentioned, which ensures flutter and contact-free guidance of the material web.
- the effects of an airfoil and air cushion nozzle are combined.
- the material web is stabilized by the blown air flowing over the flow guide bodies by being sucked up to the flow guide bodies to a small distance.
- the forces of a strong air cushion prevail in the immediate vicinity.
- both the attraction effect and the damping against fluttering are considerably improved.
- the back of the wing of the simple diffuser is replaced by a hollow space, the step, so that there is no risk of contact; are also by the edges of the Level the narrowest points uncritically determined.
- the device according to the invention is not subject to any restrictions with regard to the pressure and the volume of the blowing agent supplied. It can therefore be adapted to the respective thermodynamic needs. At high pressure and low air volume, it can be made small so that it can also be accommodated in places where little space is available, such as on the sections of the paper web that are freely guided between the drying cylinders of a paper machine. Their use is particularly advantageous here because it results in a multiple increase in performance.
- the running speed of the paper machine increases because the device acts as a drying nozzle with high heat transfer and distributes the steam vapors over and over the full width of the web with and through fresh air. This counteracts the non-uniformity of the moisture profile across the width of the paper web. At the same time, edge flutter is restricted. It is also advantageous that the blowing nozzles can be operated with unheated fresh air, since the natural heat of the paper has sufficient heat capacity for drying.
- Another area of application for the device according to the invention is the drying of material webs by means of gas-heated infrared burners.
- they are designed for large air volumes and low pressures because the flue gases generated by the infrared burners during drying are small in volume but high in temperature to have.
- a lot of blown air volume is required to absorb the hot flue gases while absorbing the water vapor generated during drying and to reduce the resulting mixed air to a low temperature that is not critical for the discharge pipes.
- the device can be used at the inlet and / or outlet slots of dryers in order to seal the dryer at the inlet and / or outlet slot from the outside atmosphere.
- the device according to FIG. 1 has two blowing nozzles 2, 3 arranged one behind the other in the running direction of a material web 1 and extending transversely to it.
- the blowing direction of these blowing nozzles 2, 3 is directed obliquely against the material web in the dot-dash position in which it would be without the effect of the device according to the invention.
- the so-called threading rope 4 for pulling a paper web also runs in a paper machine.
- the slot-shaped blowing nozzles 2, 3 with their nozzle lips 5, 6, 7, 8 are formed from solid shaped bodies 9, 10, 11.
- the flow guide body 13 located between the flow guide body 12 of the rear blow nozzle 2 and the rear nozzle lip 6 of the front blow nozzle 3 is designed as an impact diffuser. In the exemplary embodiment, it has two stages 12a, 12b. The length of each step 12a, 12b is at least three times the height of the step.
- the material web 1 takes the course shown in the drawing. It can be seen that they are closely spaced the flow guide bodies 12, 13 and the impact diffuser 12a, 12b is guided without touching. This is possible because the material web 1 is subjected to repulsive and attractive forces.
- the device shown in FIG. 1 is used in accordance with FIG. 2 in a paper machine, specifically on the free path of the paper web 1 guided between an upper drying cylinder 14 and a lower drying cylinder 15.
- Felt guide rollers 16, 17 are assigned to the drying cylinders 14, 15 run with the upper and lower felt 18,19.
- a doctor blade 20 associated with the lower drying cylinder, which forms a structural unit with the device according to the invention.
- a duct 24 consisting of welded and welded plates 22, 23 is fastened to a pipe 21 which can be adjusted in the direction of the double arrow P for the supply of blown air. Blown air is supplied to this channel 24 via openings 25 in the jacket of the tube 21.
- the shaped bodies 9, 10, 11 shown in FIG. 1 are mounted on the plate 23 facing the paper web 1.
- the molded body 9 comprising the nozzle lip 5 also serves as a clamping plate for the scraper 26 of the squeegee. Blown air is supplied to the blower nozzles 2, 3 from the duct 24 via openings 27, 28 in the plate 23.
- FIG. 3 differs from that of FIG. 1 essentially only in that the guide body 30 designed as an impact diffuser is single-stage and that the convexly curved flow guide body 31 is closer to the front blowing air nozzle 32 of the material web 1 than the convexly curved flow guide body 33 rear blowing air nozzle 34.
- the device according to FIG. 1 is constructed from compact shaped bodies 9, 10, 11 and is intended for high pressures and small volumes
- the device according to FIG. 3 is constructed from sheet metal and is intended for small pressures and large volumes. Such devices are advantageously used in gas-heated infrared radiation fields 35.
- two infrared emitters 36, 37 form a radiation field, on the rear edge of which in the direction of the material web the device according to FIG. 3 is arranged.
- a suction unit 35 for a first partial volume and a deflection and return unit 36 for another partial volume are arranged on the opposite front edge.
- the blow jet blown into the area of the infrared radiation field by the device according to the invention diverges, as indicated by the dashed line 37. It absorbs the steam 38 released from the material web during drying.
- the infrared radiation burner 36, 37 enters the blow jet from the space above the dashed line 37 flue gas 39.
- a partial volume of this blow jet consisting of the weights of the nozzle outlet, the steam and the flue gas, is removed from the suction unit 35, while another part, consisting of the excess mass of the jet admixture, is returned according to the flow arrows 40.
- FIG. 5 which shows a double nozzle of symmetrical design
- the individual nozzle has in principle the structure of that of FIG. 1.
- Such symmetrical double nozzles are used when the task is to stabilize a material web over a large free distance and to supply it with air supply.
- a device according to the invention with a two-stage diffuser is arranged above and below the material web.
- the devices are arranged on the inside of the insulated end wall 41, 42 which forms the inlet slot of a dryer.
Abstract
Description
Die Erfindung bezieht sich auf eine Vorrichtung zum berührungslosen Führen von Materialbahnen mit mindestens zwei in Laufrichtung der Materialbahn hintereinander angeordneten und sich quer zu ihr erstreckenden als Schlitze oder Lochreihen ausgebildeten Blasdüsen, deren Blasstrahlen gleichsinnig und schräg gegen die Materialbahn gerichtet und auf der der Materialbahn zugewandten Seite durch Strömungsleitkörper geführt sind, von denen der sich an die in Laufrichtung der Materialbahn rückwärtigen Blasdüse anschließende Strömungsleitköroer zur Materialbahn hin konvex gekrümmt ist.The invention relates to a device for contactless guiding of material webs with at least two blowing nozzles arranged one behind the other in the running direction of the material web and extending transversely to it and designed as slots or rows of holes, the blowing jets of which are directed in the same direction and obliquely against the material web and on the side facing the material web are guided by flow guide bodies, of which the flow guide body adjoining the blowing nozzle rearward in the running direction of the material web is convexly curved toward the material web.
Solche überströmte Tragflächen bilden zusammen mit der Materialbahn Venturidiffusoren, wobei die Materialbahn durch den Bernoulli-Effekt zum Flattern gebracht wird. Durch besondere Maßnahmen läßt sich das Flattern unterdrücken, z.B. durch eine Perforation in der Tragfläche, da dann einströmende Zusatzluft die Strömung an der Materialbahn bleiben läßt, oder durch Tragflächenabsaugung, da dann die Strömung nur an der Tragfläche bleibt. Solche einseitigen Strömungen enstehen auch in Ausnahmefällen, wenn die Materialbahnspannung und das Materialgewicht einerseits und Tragflächenform und Tragflächenüberströmung andererseits aufeinander abgestimmt sind. Die Sauberhaltung und die Freizügigkeit in der Produktion einer Papiermaschine lassen aber im allgemeinen weder obige Maßnahmen zu noch die Bedingungen für eindeutige Strömungsverhältnisse einhalten. Da bei einem Venturidiffusor die engste Stelle zwischen Materialbahn und dem Tragflächenrücken je nach den Bedingungen wechselt, können nämlich das Flattern nicht vermieden und die Berührungssicherheit nicht erreicht werden.Such overflowed wings together with the material web form Venturi diffusers, the material web being caused to flutter by the Bernoulli effect. The flutter can be suppressed by special measures, for example by a perforation in the wing, since additional air flowing in then allows the flow to remain on the material web, or by wing suction, since then the Flow only remains on the wing. Such one-sided flows also arise in exceptional cases if the material web tension and the material weight on the one hand and the wing shape and wing overflow on the other hand are coordinated. However, keeping them clean and free movement in the production of a paper machine generally does not permit the above measures or the conditions for clear flow conditions. Because with a Venturi diffuser the narrowest point between the material web and the wing back changes depending on the conditions, flapping cannot be avoided and safety against contact cannot be achieved.
Bei einer bekannten Vorrichtung der eingangs genannten Art verläuft der Strömungsleitkörper zwischen dem konvex gekrümmten Strömungsleitkörper der rückwärtigen Blasdüse und der vorderseitigen Blasdüse im wesentlichen parallel zur Materialbahn. Zur Verwirbelung der Strömung kann die Oberfläche des parallelverlaufenden Strömungsleitkörpers aufgerauht sein, insbesondere Wellungen aufweisen. Besondere Vorkehrungen gegen Flattern der Materialbahn sind nicht getroffen. Deshalb besteht die Gefahr, daß die Materialbahn anschlägt (DT 19 54 880 B2).In a known device of the type mentioned in the introduction, the flow guide between the convexly curved flow guide of the rear blowing nozzle and the front blowing nozzle runs essentially parallel to the material web. To swirl the flow, the surface of the parallel flow guide body can be roughened, in particular have corrugations. No special precautions have been taken to prevent the material web from fluttering. There is therefore a risk that the material web will strike (DT 19 54 880 B2).
Die Gefahr, daß Materialbahnen auf frei geführten Strecken zum Flattern neigen, ist besonders groß bei hohen Laufgeschwindigkeiten. Untersuchungen haben gezeigt, daß das Flattern durch Strömungen an der Materialbahnkante quer zur Laufrichtung in Gebieten höheren und niederen Druckes erfolgt. Durch das Flattern wird die Materialbahn an den Kanten stark beansprucht, so daß die Gefahr eines Materialbahnrisses besteht. Bei Papiermaschinen mit oberen und unteren Trockenzylindern besteht diese Gefahr an den frei geführten Strecken zwischen den oberen und unteren Trockenzylindern. An diesen Stellen besteht darüber hinaus die Schwierigkeit, die beim Trocknen entstehenden Dampfschwaden abzuführen, damit die Papierbahn über die volle Maschinenbreite gleichmäßig getrocknet werden kann. Das Flatterproblem hat man versucht durch einen die Papierbahn auf den freien Strecken führenden mitlaufenden Einwegfilz in den Griff zu bekommen. Die für die gleichmäßige Trocknung notwendige Belüftung des Filzes bringt aber neue Probleme mit sich.The risk that material webs tend to flutter on freely guided routes is particularly great at high running speeds. Studies have shown that the fluttering is caused by currents at the edge of the material web transverse to the direction of travel in areas of higher and lower pressure. Due to the flutter, the material web at the edges is heavily stressed so that there is a risk of a material web tear. In the case of paper machines with upper and lower drying cylinders, this danger exists on the freely guided sections between the upper and lower drying cylinders. At these points there is also the difficulty of removing the steam that arises during drying so that the paper web can be dried uniformly over the full width of the machine. The flutter problem has been attempted to be dealt with by a disposable felt that runs along the paper web on the free paths. The ventilation of the felt, which is necessary for uniform drying, brings with it new problems.
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum berührungslosen Führen von Materialbahnen der eingangs genannten Art zu schaffen, die eine flatter- und berührungsfreie Führung der Materialbahn gewährleistet.The invention has for its object to provide a device for contactless guiding of material webs of the type mentioned, which ensures flutter and contact-free guidance of the material web.
Diese Aufgabe wird erfindungsgemäß bei einer Vorrichtung der eingangs genannten Art dadurch gelöst, daß der zwischen dem konvex gekrümmten Strömungsleitkörper der rückwärtigen Blasdüse und der vorderseitigen Blasdüse liegende Strömungsleitkörper als ein mindestens einstufiger Stufendiffusor (= Stoßdiffusor) ausgebildet.This object is achieved according to the invention in a device of the type mentioned at the outset in that the flow guide body lying between the convexly curved flow guide body of the rear blowing nozzle and the front-side blow nozzle is designed as an at least one-stage step diffuser (= impact diffuser).
Bei der erfindungsgemäßen Vorrichtung sind die Wirkungen einer Tragflächen- und Luftkissendüse in sich vereinigt. Die Materialbahn wird durch die über die Strömungsleitkörper strömende Blasluft stabilisiert, indem sie bis auf einen kleinen Abstand an die Strömungsleitkörper angesaugt wird. Im unmittelbaren Nahbereich dagegen herrschen die Kräfte eines starken Luftkissens vor. Es wurde festgestellt, daß bei der erfindungsgemäßen Vorrichtung im Vergleich zu einer Vorrichtung mit einem als einfacher Diffusor (Venturidiffusor) ausgebildeten Strömungsleitkörper sowohl die Anzugswirkung als auch die Dämpfung gegen Flattern erheblich verbessert ist. Bei einem Stufendiffusor ist der Tragflächenrücken des einfachen Diffusors durch einen Hohleraum, die Stufe, ersetzt, so daß keine Berührungsgefahr besteht; ferner sind durch die Kanten der Stufe die engsten Stellen unkritisch festgelegt. Diese Wirkungen des Stufendiffusors können noch dadurch verbessert werden, daß auch der sich an die vorderseitige Düsenlippe der vorderseitigen Blasdüse anschließende Strömungsleitkörper zur Materialbahn hin konvex gekrümmt ist.In the device according to the invention, the effects of an airfoil and air cushion nozzle are combined. The material web is stabilized by the blown air flowing over the flow guide bodies by being sucked up to the flow guide bodies to a small distance. In contrast, the forces of a strong air cushion prevail in the immediate vicinity. It was found that in the device according to the invention, compared to a device with a flow guide body designed as a simple diffuser (Venturi diffuser), both the attraction effect and the damping against fluttering are considerably improved. In the case of a step diffuser, the back of the wing of the simple diffuser is replaced by a hollow space, the step, so that there is no risk of contact; are also by the edges of the Level the narrowest points uncritically determined. These effects of the step diffuser can be further improved in that the flow guide body adjoining the front-side nozzle lip of the front-side blowing nozzle is also convexly curved toward the material web.
Weitere Vorteile der erfindungsgemäßen Vorrichtung bestehen darin, daß sie hinsichtlich des Drucks und des Volumens des zugeführten Blasmittels keiner Beschränkung unterworfen ist. Sie kann deshalb den jeweiligen thermodynamischen Bedürfnissen angepaßt werden. Bei hohem Druck und geringem Luftvolumen läßt sie sich klein bauen, so daß sie auch an Orten untergebracht werden kann, wo wenig Raum zur Verfügung steht, wie beispielsweise an den zwischen den Trockenzylindern einer Papiermaschine frei geführten Strecken der Papierbahn. Hier ist ihr Einsatz besonders vorteilhaft, weil sich damit eine mehrfache Leistungserhöhung ergibt. Die Laufgeschwindigkeit der Papiermaschine erhöht sich, weil die Vorrichtung als Trockendüse mit hohem Wärmeübergang wirkt und über die volle Bahnbreite mit und durch herangeführte Frischluft die Dampfschwaden vertreibt. Hierdurch wird der Ungleichmäßigkeit des Feuchteprofils über die Breite der Papierbahn entgegengewirkt. Gleichzeitig wird das Kantenflattern eingeschränkt. Vorteilhaft ist auch, daß die Blasdüsen mit ungeheizter Frischluft betrieben werden können, da die Eigenwärme des Papiers genügend Wärmekapazität für die Trocknung hat.Further advantages of the device according to the invention are that it is not subject to any restrictions with regard to the pressure and the volume of the blowing agent supplied. It can therefore be adapted to the respective thermodynamic needs. At high pressure and low air volume, it can be made small so that it can also be accommodated in places where little space is available, such as on the sections of the paper web that are freely guided between the drying cylinders of a paper machine. Their use is particularly advantageous here because it results in a multiple increase in performance. The running speed of the paper machine increases because the device acts as a drying nozzle with high heat transfer and distributes the steam vapors over and over the full width of the web with and through fresh air. This counteracts the non-uniformity of the moisture profile across the width of the paper web. At the same time, edge flutter is restricted. It is also advantageous that the blowing nozzles can be operated with unheated fresh air, since the natural heat of the paper has sufficient heat capacity for drying.
Ein weiteres Einsatzgebiet für die erfindungsgemäße Vorrichtung ist die Trocknung von Materialbahnen mittels gasbeheizter Infrarotbrenner. In diesem Fall sind sie für großes Luftvolumen und geringen Druck ausgelegt, weil die durch die Infrarotbrenner beim Trocknen entstehenden Rauchgase ein kleines Volumen, aber eine hohe Temperatur haben. Es wird viel Blasluftvolumen benötigt, um die heißen Rauchgase unter Aufnahme des bei der Trocknung entstehenden Wasserdampfs aufzunehmen und die so entstehende Mischluft auf eine für Abfuhrleitungen unkritische niedrige Temperatur herabzusetzen.Another area of application for the device according to the invention is the drying of material webs by means of gas-heated infrared burners. In this case, they are designed for large air volumes and low pressures because the flue gases generated by the infrared burners during drying are small in volume but high in temperature to have. A lot of blown air volume is required to absorb the hot flue gases while absorbing the water vapor generated during drying and to reduce the resulting mixed air to a low temperature that is not critical for the discharge pipes.
Weiter kann die Vorrichtung an den Ein- und/oder Auslaßschlitzen von Trocknern eingesetzt werden, um den Trockner am Ein- und/oder Auslaßschlitz gegenüber der Außenatmosphäre abzudichten.Furthermore, the device can be used at the inlet and / or outlet slots of dryers in order to seal the dryer at the inlet and / or outlet slot from the outside atmosphere.
Weitere vorteilhafte Ausgestaltungen sind in den Unteransprüchen gekennzeichnet.Further advantageous refinements are characterized in the subclaims.
Im folgenden wird die Erfindung anhand einer Ausführungsbeispiele darstellenden Zeichnung näher erläutert. Im einzelnen zeigen:
- Fig. 1
- eine Vorrichtung zum berührungslosen Führen einer Materialbahn im Querschnitt,
- Fig. 2
- eine Papiermaschine im Ausschnitt im Bereich einer zwischen einem oberen Trockenzylinder und einem unteren Trockenzylinder frei geführten Papierbahn mit einer Vorrichtung zum berührungslosen Führen der Papierbahn in schematischer Darstellung in Seitenansicht,
- Fig. 3
- eine Vorrichtung zum berührungslosen Führen einer Materialbahn in einer zur Fig.1 anderen Ausführungsform in schematischer Darstellung in Seitenansicht,
- Fig. 4
- ein Infrarotstrahlungsfeld mit einer Vorrichtung gemäß Fig.3 in schematischer Darstellung in Seitenansicht,
- Fig. 5
- eine Vorrichtung zum berührungslosen Führen der Materialbahnen als symmetrischer Doppeldüse und
- Fig. 6
- einen Einlaßschlitz eines Schwebetrockners mit auf der Ober- und Unterseite des Schlitzes angeordneten Vorrichtungen zum berührungslosen Führen einer Materialbahn in schematischer Darstellung in Seitenansicht.
- Fig. 1
- a device for the contactless guiding of a material web in cross section,
- Fig. 2
- a paper machine in the cutout in the area of a paper web freely guided between an upper drying cylinder and a lower drying cylinder with a device for contactless guiding of the paper web in a schematic representation in a side view,
- Fig. 3
- 1 shows a device for contactless guiding of a material web in a different embodiment from that in FIG.
- Fig. 4
- an infrared radiation field with a device according to Figure 3 in a schematic representation in side view,
- Fig. 5
- a device for contactless guidance of the material web as a symmetrical double nozzle and
- Fig. 6
- an inlet slot of a levitation dryer with arranged on the top and bottom of the slot devices for contactless guidance of a material web in a schematic representation in side view.
Die Vorrichtung gemäß Figur 1 weist zwei in Laufrichtung einer Materialbahn 1 hintereinander angeordnete und sich quer zu ihr erstreckende als Schlitze ausgebildete Blasdüsen 2,3 auf. Die Blasrichtung dieser Blasdüsen 2,3 ist schräg gegen die Materialbahn in der strichpunktierten Lage gerichtet, in der sie sich ohne die Wirkung der erfindungsgemäßen Vorrichtung befinden würde. In dieser Lage verläuft bei einer Papiermaschine auch das sogenannte Aufführseil 4 zum Einziehen einer Papierbahn.The device according to FIG. 1 has two blowing
Die schlitzförmigen Blasdüsen 2,3 mit ihren Düsenlippen 5,6,7,8 sind aus massiven Formkörpern 9,10,11 gebildet. An die jeweils vorderseitigen Düsenlippen 7,8 schließen sich konvex zur Materialbahn 1 gekrümmte Strömungsleitkörper 12,13 an. Der zwischen dem Strömungsleitkörper 12 der rückwärtigen Blasdüse 2 und der rückwärtigen Düsenlippe 6 der vorderseitigen Blasdüse 3 liegende Strömungsleitkörper 13 ist als Stoßdiffusor ausgebildet. Er hat im Ausführungsbeispiel zwei Stufen 12a,12b. Die Länge einer jeden Stufe 12a,12b ist mindestens dreimal so groß wie die Höhe der Stufe.The slot-shaped
Bei einer derart ausgeführten Vorrichtung nimmt die Materialbahn 1 den in der Zeichnung dargestellten Verlauf ein. Es ist zu erkennen, daß sie dabei in engem Abstand zu den Strömungsleitkörpern 12,13 und dem Stoßdiffusor 12a, 12b geführt wird ohne zu berühren. Dies ist möglich, weil die Materialbahn 1 abstoßenden und anziehenden Kräften ausgesetzt ist.In the case of a device of this type, the
Die in Figur 1 dargestellte Vorrichtung ist gemäß Figur 2 bei einer Papiermaschine eingesetzt, und zwar an der zwischen einem oberen Trockenzylinder 14 und einem unteren Trockenzylinder 15 geführten freien Strecke der Papierbahn 1. Den Trockenzylindern 14,15 sind Filzleitwalzen 16,17 zugeordnet, die den mitlaufenden oberen und unteren Filz 18,19 führen.The device shown in FIG. 1 is used in accordance with FIG. 2 in a paper machine, specifically on the free path of the
In dem Freiraum zwischen dem oberen Trockenzylinder 14 und dem unteren Trockenzylinder 15 ist ein dem unteren Trockenzylinder zugeordnetes Rakel 20 untergebracht, das mit der erfindungsgemäßen Vorrichtung eine Baueinheit bildet. An einem in Richtung des Doppelpfeils P verstellbaren Rohr 21 für die Zufuhr von Blasluft ist ein aus zusammengeschweißten und angeschweißten Platten 22,23 bestehender Kanal 24 befestigt. Diesem Kanal 24 wird über Öffnungen 25 im Mantel des Rohres 21 Blasluft zugeführt.In the space between the upper drying cylinder 14 and the
Auf der der Papierbahn 1 zugekehrten Platte 23 sind die in Figur 1 dargestellten Formkörper 9,10,11 montiert. Der die Düsenlippe 5 umfassende Formkörper 9 dient gleichzeitig als Klemmplatte für den Schaber 26 des Rakels. Über Öffnungen 27,28 in der Platte 23 wird den Blasdüsen 2,3 aus dem Kanal 24 Blasluft zugeführt.The shaped
Das Ausführungsbeispiel der Figur 3 unterscheidet sich von dem der Figur 1 im wesentlichen nur darin, daS der als Stoßdiffusor ausgebildete Leitkörper 30 einstufig ist und daß der konvex gekrümmte Strömungsleitkörper 31 der vorderseitigen Blasluftdüse 32 der Materialbahn 1 näher liegt als der konvex gekrümmte Strömungsleitkörper 33 der rückwärtigen Blasluftdüse 34. Während die Vorrichtung gemäß Figur 1 aus kompakten Formkörpern 9,10,11 aufgebaut ist und für hohe Drücke und kleine Volumina bestimmt ist, ist die Vorrichtung gemäß Figur 3 aus Blech aufgebaut und für kleine Drücke und große Volumina bestimmt. Solche Vorrichtungen werden vorteilhaft bei gasbeheizten Infrarotstrahlungsfeldern 35 eingesetzt.The embodiment of FIG. 3 differs from that of FIG. 1 essentially only in that the
Beim Ausführungsbeispiel der Figur 4 bilden zwei Infrarotstrahler 36,37 ein Strahlungsfeld, an dessen in Materialbahnlaufrichtung rückwärtigem Rand die Vorrichtung gemäß Figur 3 angeordnet ist. Am gegenüberliegenden vorderseitigen Rand ist eine Absaugeeinheit 35 für ein erstes Teilvolumen und eine Ablenk- und Rückführeinheit 36 für ein anderes Teilvolumen angeordnet.In the exemplary embodiment in FIG. 4, two
Der von der erfindungsgemäßen Vorrichtung in den Bereich des Infrarotstrahlungsfeldes eingeblasene Blasstrahl divergiert, wie durch die gestrichelte Linie 37 angedeutet ist. Dabei nimmt er den beim Trocknen von der Materialbahn freigesetzten Dampf 38 auf. Darüber hinaus gelangt aus dem Raum oberhalb der gestrichelten Linie 37 Rauchgas 39 der Infrarotstrahlungsbrenner 36,37 in den Blasstrahl. Ein Teilvolumen dieses Blasstrahls, bestehend aus den Gewichten des Düsenaustritts, des Dampfes und des Rauchgases wird von der Absaugeeinheit 35 abgeführt, während ein anderer Teil, bestehend aus der überschiessenden Masse der Strahlbeimischung, entsprechend den Strömungspfeilen 40 rückgeführt wird.The blow jet blown into the area of the infrared radiation field by the device according to the invention diverges, as indicated by the dashed
Beim Ausführungsbeispiel der Figur 5, das eine Doppeldüse symmetrischer Ausführung zeigt, hat die einzelne Düse im Prinzip den Aufbau derjenigen der Figur 1. Solche symmetrische Doppeldüsen werden eingesetzt, wenn es gilt, eine Materialbahn über eine große freie Strecke stabilisiert zu führen und mit Luft zu versorgen.In the embodiment of FIG. 5, which shows a double nozzle of symmetrical design, the individual nozzle has in principle the structure of that of FIG. 1. Such symmetrical double nozzles are used when the task is to stabilize a material web over a large free distance and to supply it with air supply.
Beim Ausführungsbeispiel der Figur 6 ist oberhalb und unterhalb der Materialbahn eine erfindungsgemäße Vorrichtung mit einem zweistufigen Diffusor angeordnet. Die Vorrichtungen sind innenseitig an der isolierten, den Einlaßschlitz eines Trockners bildenden Stirnwand 41,42 angeordnet.In the exemplary embodiment in FIG. 6, a device according to the invention with a two-stage diffuser is arranged above and below the material web. The devices are arranged on the inside of the insulated end wall 41, 42 which forms the inlet slot of a dryer.
Claims (10)
- A device for the contactless guiding of webs (1) of material, having at least two blowing nozzles (2, 3) constructed in the form of slots or rows of holes which are disposed one after the other in the direction in which the web (1) of material travels and extend transversely of the web (1) and whose blowing jets are directed to the same hand and at an angle towards the web (1) of material and which on the side adjacent the web (1) of material are guided by flow deflecting members (12, 12a, 12b, 13), of which the flow deflecting member (12) adjoining the rear blowing nozzle (2), viewed in the direction in which the web (1) of material runs, is convexly curved in the direction of the web (1) of material, characterized in that the flow deflecting member (12a, 12b) lying between the convexly curved flow deflecting member (12) and the front side blowing nozzle (6) takes the form of an at least single-step surge diffuser.
- A device according to claim 1, characterized in that the length of each step (12a, 12b) of the surge diffuser corresponds to at least three times the height of said step.
- A device according to claims 1 or 2, characterized in that the front side edge of the flow deflecting member (12a, 12b) constructed in the form of a surge diffusor forms the rear nozzle lip (6) of the front side blowing nozzle (3).
- A device according to one of claims 1 to 3, characterized in that the flow deflecting member (13) adjoining the front side nozzle lip (8) of the front side blowing nozzle (3) is convexly curved in the direction of the web (1) of material.
- A device according to claim 4, characterized in that the convexly curved flow deflecting member (13) lies nearer to the front side blowing nozzle (3) of the web (1) of material than the convexly curved flow deflecting member (12) of the rear blowing nozzle (2).
- A device according to one of claims 1 to 5, characterized in that in a paper-making machine with top and bottom drying rollers (14, 15) for the web (1) of material, the device is disposed with a blowing jet component directed in the direction in which the web of material runs at a free portion of the web (1) of material formed between one of the top and one of the bottom drying rollers (14, 15).
- A device according to claim 6, characterized in that it is borne by the holder (22, 23) of a scraper (26) adjustable on a drying cylinder.
- A device according to claim 7, characterized in that the holder (22, 23) has a supply channel (24) for the blowing medium to be supplied to the blowing nozzles (2, 3).
- A device according to one of claims 1 to 5, characterized in that it is disposed on one side of an infrared radiation area (36, 37).
- A device according to claim 9, characterized in that disposed on the opposite side of the infrared radiation area (36, 37) are a suctional removal unit (35) for a component volume and a deflecting and return unit (36) for another component volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88109878T ATE68221T1 (en) | 1987-07-07 | 1988-06-22 | DEVICE FOR CONTACTLESS GUIDE OF MATERIAL WEBS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3722354 | 1987-07-07 | ||
| DE3722354 | 1987-07-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0298299A1 EP0298299A1 (en) | 1989-01-11 |
| EP0298299B1 true EP0298299B1 (en) | 1991-10-09 |
Family
ID=6331038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88109878A Expired - Lifetime EP0298299B1 (en) | 1987-07-07 | 1988-06-22 | Device for the contactless guiding of webs |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4893416A (en) |
| EP (1) | EP0298299B1 (en) |
| JP (1) | JPH0192157A (en) |
| AT (1) | ATE68221T1 (en) |
| DE (1) | DE3865381D1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3841909A1 (en) * | 1988-04-02 | 1989-10-19 | Hilmar Vits | METHOD AND DEVICE FOR THE FLOATING GUIDANCE OF ARCHED OR RAIL-SHAPED MATERIAL OVER A CONVEYOR LINE, ESPECIALLY A CURVED CONVEYOR LINE |
| FI96125C (en) * | 1991-09-05 | 1996-05-10 | Valmet Paper Machinery Inc | Arrangement of suppressor nozzles intended for treatment of webs and method of an arrangement for suppressor nozzles intended for treatment of webs |
| FI92421B (en) * | 1992-03-19 | 1994-07-29 | Valmet Paper Machinery Inc | Method for Air Drying of Substances, Nozzle Blower for an Air Dryer and Cellulose Dryer |
| US5471766A (en) * | 1993-03-18 | 1995-12-05 | Valmet Paper Machinery, Inc. | Method in contact-free air-drying of a material web as well as a nozzle-blow-box and a pulp dryer that make use of the method |
| DE19839916A1 (en) * | 1998-09-02 | 2000-03-09 | Jagenberg Papiertech Gmbh | Method and apparatus for reducing the volume or pressure of a fluid being dragged into a gap by moving surfaces |
| FI105936B (en) * | 1999-03-18 | 2000-10-31 | Valmet Corp | Method and apparatus for stabilizing the course of a web in a paper machine or the like |
| US6936137B2 (en) * | 2001-10-24 | 2005-08-30 | Honeywell International Inc. | Air clamp stabilizer for continuous web materials |
| JP4965231B2 (en) * | 2006-11-21 | 2012-07-04 | 株式会社ドクター製作所 | Doctor for paper feeding |
| US8088255B2 (en) * | 2008-04-18 | 2012-01-03 | Honeywell Asca Inc | Sheet stabilizer with dual inline machine direction air clamps and backsteps |
| US8177940B2 (en) * | 2009-03-04 | 2012-05-15 | Andritz Inc. | Apparatus and method for stabilizing a moving web having transitions in a surface adjacent the web |
| DE102010012084A1 (en) * | 2010-03-19 | 2011-09-22 | Sms Siemag Ag | Method and device for feeding a separating layer onto a metal strip |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988008950A1 (en) * | 1987-05-09 | 1988-11-17 | Kurt Krieger | Device for float conveying of material webs |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3231165A (en) * | 1961-12-02 | 1966-01-25 | Svenska Flaektfabriken Ab | Method and apparatus for stabilizing an air-borne web |
| US3587177A (en) * | 1969-04-21 | 1971-06-28 | Overly Inc | Airfoil nozzle |
| CA901281A (en) * | 1969-11-07 | 1972-05-30 | Dominion Engineering Works | Sonic drying of webs on rolls |
| DE2556442C2 (en) * | 1975-12-15 | 1984-09-06 | Gerhardt, Hans-Joachim, Prof. M.Sc. Dipl.-Ing., 5100 Aachen | Device for the floating guidance of material webs |
| FI68723C (en) * | 1978-05-04 | 1985-10-10 | Valmet Oy | DYSA FOER SVAEVTORK |
| FI75008C (en) * | 1986-03-14 | 1992-02-17 | Valmet Oy | Float dryer and method for streamlining its function |
-
1988
- 1988-06-22 AT AT88109878T patent/ATE68221T1/en not_active IP Right Cessation
- 1988-06-22 DE DE8888109878T patent/DE3865381D1/en not_active Expired - Lifetime
- 1988-06-22 EP EP88109878A patent/EP0298299B1/en not_active Expired - Lifetime
- 1988-07-06 US US07/215,574 patent/US4893416A/en not_active Expired - Fee Related
- 1988-07-07 JP JP63167881A patent/JPH0192157A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988008950A1 (en) * | 1987-05-09 | 1988-11-17 | Kurt Krieger | Device for float conveying of material webs |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE68221T1 (en) | 1991-10-15 |
| US4893416A (en) | 1990-01-16 |
| EP0298299A1 (en) | 1989-01-11 |
| DE3865381D1 (en) | 1991-11-14 |
| JPH0192157A (en) | 1989-04-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3403642C2 (en) | ||
| AT392991B (en) | DRYING PART FOR A MACHINE FOR THE PRODUCTION OR PROCESSING OF FIBER STRIPS, ESPECIALLY PAPER STRIPS | |
| CH637089A5 (en) | BLOW BOX FOR FLOATING GUIDING AND / OR PROMOTING RAILWAYS OR ARCHES. | |
| DE1954880B2 (en) | DEVICE FOR GUIDING CURRENT MATERIALS THROUGH A TREATMENT SYSTEM | |
| DE1474239C3 (en) | Method and device for stabilizing the position of floating webs of material under the action of a blowing agent | |
| EP0298299B1 (en) | Device for the contactless guiding of webs | |
| DE69815867T2 (en) | SUSPENDED DRYER UNIT | |
| DE2836103C2 (en) | Air nozzle for a nozzle dryer | |
| DE19922165C2 (en) | Dryer for band or plate-shaped goods | |
| DE2935866A1 (en) | RAILWAY DRYER ACCORDING TO THE AIR AIR PRINCIPLE | |
| DE4029487A1 (en) | Coated paper drying - using blown air to form air cushion to carry web through dryers without contact | |
| EP0202561B1 (en) | Ironing apparatus | |
| WO1994004740A1 (en) | Blowing device for textile webs | |
| EP0723522B1 (en) | Device for the suspension guidance of a travelling web | |
| DE3822624C2 (en) | ||
| DE3716468C2 (en) | ||
| EP0658427B1 (en) | Curing apparatus | |
| DE112010002254T5 (en) | Apparatus for conveying a web-like material in a fiber web machine and fiber web machine | |
| DE3942029B4 (en) | Device for carrying, deflecting and spreading a web | |
| DE2203621C3 (en) | Device for drying webs of material | |
| DE2240713C3 (en) | Nozzle dryer for coated or printed webs | |
| DE10085256B4 (en) | Method for supporting a track and track support device | |
| DE10352980B4 (en) | steam blow | |
| DE4404726C2 (en) | Pocket ventilation in a two-wire cylinder dryer | |
| DE2724328C2 (en) | Dryers for webs of material, in particular in web offset and floating nozzles, in particular for use in the dryer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB IT LI NL SE |
|
| 17P | Request for examination filed |
Effective date: 19890315 |
|
| 17Q | First examination report despatched |
Effective date: 19901025 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE ES FR GB IT LI NL SE |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19911009 Ref country code: BE Effective date: 19911009 Ref country code: SE Effective date: 19911009 Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19911009 Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT Effective date: 19911009 |
|
| REF | Corresponds to: |
Ref document number: 68221 Country of ref document: AT Date of ref document: 19911015 Kind code of ref document: T |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) | ||
| REF | Corresponds to: |
Ref document number: 3865381 Country of ref document: DE Date of ref document: 19911114 |
|
| ET | Fr: translation filed | ||
| NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19920622 Ref country code: AT Effective date: 19920622 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Effective date: 19920630 Ref country code: LI Effective date: 19920630 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| 26N | No opposition filed | ||
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19920622 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19930226 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19930302 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |