EP0692569B1 - Process and apparatus in a cylinder dryer of a papermaking machine with two dryer fabrics - Google Patents

Process and apparatus in a cylinder dryer of a papermaking machine with two dryer fabrics Download PDF

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Publication number
EP0692569B1
EP0692569B1 EP19950108417 EP95108417A EP0692569B1 EP 0692569 B1 EP0692569 B1 EP 0692569B1 EP 19950108417 EP19950108417 EP 19950108417 EP 95108417 A EP95108417 A EP 95108417A EP 0692569 B1 EP0692569 B1 EP 0692569B1
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EP
European Patent Office
Prior art keywords
air
wire
dryer
web
paper web
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EP19950108417
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German (de)
French (fr)
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EP0692569A2 (en
EP0692569A3 (en
Inventor
Alfred Ing. Luttenberger
Reinhard Dipl.Ing.Dr. Pinter
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Andritz AG
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Andritz AG
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Publication of EP0692569A3 publication Critical patent/EP0692569A3/en
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    • 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
    • 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
    • D21F5/046—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using pocket ventilation systems

Definitions

  • the invention relates to a method in a cylinder dryer of a paper machine, where using the paper web on the top cylinders an upper sieve and on the lower cylinders using a lower sieve is guided, with the screens from the drying cylinders and in their Intermediate guide rollers are guided such that the Web on the top cylinder row from the top wire in direct drying contact with the surface of the top cylinder and accordingly from the bottom wire the surface of the lower cylinder is pressed and the web of one Row of cylinders led to the other as a free train over a certain distance is, whereby air is blown and the air, in particular heated fresh air directly into the pockets formed by the dryer fabric and the paper web is blown in.
  • the invention further relates to a device for performing of the procedure for a cylinder dryer of a paper machine, is provided with a two-wire guide, the air blowing device having the air injection device, in particular a Air injection tube, in the one formed by the dryer fabric and the paper web Bag is provided.
  • GB 2 091 400 describes a method and a device known in the air in the area between the free train of the paper web, the surface of the drying cylinder and the sieve Guide roller is blown. Similar devices are e.g. from DE 1 120 262, US 1,660,640 or US 3,263,344 known. In all of these cases there is a risk with faster running paper machines that in this area also builds up excess pressure due to air being carried along and thereby tearing off the paper web.
  • the invention now aims at the disadvantages of the known methods and devices avoid, and especially at high machine speeds ensure adequate drying, and the risk of blowing off the Paper web from dryer fabric and web breaks through web flutter hold on.
  • the invention is therefore characterized in that in addition air the dryer fabric is sucked off, the suction from the incoming Gusset, formed by running from the dryer fabric onto a guide roller, i.e. from the area between that of the drying cylinder and the free circumference of the guide roller running together with the dryer Paper web, takes place and the amount of air extracted at least essentially corresponds to the amount of air blown in.
  • suction of the Air through the dryer can ensure even suction across the Web running direction can be achieved so that unfavorable cross currents Air can be prevented. This also causes overpressures in this Avoided area, so that the risk of tearing off the paper web is minimized. This is especially true when the amount of air extracted corresponds at least essentially to the amount of air blown in.
  • An embodiment of the invention is characterized in that the Air is blown in a targeted direction, with the air at least in two different directions can be blown.
  • the targeted Air injection can create a beneficial flow along the pockets Drying cylinder or the paper web can be achieved, with the Convection drying is still improved.
  • a further development of the invention is characterized in that the air before being blown into the pockets it is pre-distributed to give an even To reach air supply. Through this pre-distribution and the even Air supply, which is particularly transverse to the web running direction, is also a corresponding uniform drying of the paper web is guaranteed.
  • a particularly favorable development of the invention is characterized in that that an air volume of 100 to 500 m3 per hour and meter Working width, preferably from 200 to 300 m3 per hour and meter Working width, is blown. By blowing in these amounts of air the paper web dries particularly well.
  • Another embodiment of the invention is characterized in that the speed of the blown air jets in the range of 10 m / s up to 50 m / s, suitably between 20 m / s and 40 m / s.
  • the speed of the blown air jets in the range of 10 m / s up to 50 m / s, suitably between 20 m / s and 40 m / s.
  • a favorable development of the invention is characterized in that the speed of the paper web in the range from 600 to 1500 m / min, is preferably between 1000 to 1400 m / min. With such a Machine speed or speed of the paper web becomes one optimal drying achieved, i.e. there is neither insufficient drying another overdrying of the paper.
  • the device according to the invention for a cylinder dryer Paper machine with a two-wire guide which is an air blowing device has, the air blowing device, in particular a Air injection tube, in the one formed by the dryer fabric and the paper web Bag is provided, is characterized in that an additional Suction box in the drying cylinders lying next to each other remaining spaces from those above each other Drying cylinders running dryer fabrics and the free sectors of that guide roller in question are provided, is provided.
  • the arrangement of an additional suction box makes it particularly easy suck off the air blown into the pockets cheaply, furthermore one particularly favorable assembly of the suction boxes can be done. Through this local attachment of the suction box is further guaranteed that a Damage to the paper web through the suction box is excluded because only the dryer fabric is guided along the top of the suction box becomes.
  • a favorable development of the invention is characterized in that the air blowing device, in particular blowing openings arranged in rows, in particular has holes and / or slots for the air outlet, wherein several rows of holes or slots can be provided, which in different Blowing direction are directed.
  • the air blowing device allows the air to be put into the pockets particularly cheaply bring in and the air flow in the bag accordingly for optimal Influence drying.
  • a favorable embodiment of the invention is characterized in that in the air blowing device a device for pre-distributing the air for uniform, appropriately vertical, blow-out is provided.
  • this pre-distributing device is particularly suitable for the flow in the pockets are influenced favorably, with flows in the transverse direction to the web running direction be avoided.
  • this can also be done from the feed side be designed to be conical, with a feed of is possible on both sides.
  • a particularly favorable embodiment of the invention is characterized in that that the air injection device is designed as a scraper bar, the scraper can act as an air guide.
  • the air injection device is designed as a scraper bar
  • the scraper can act as an air guide.
  • a favorable embodiment of the invention is characterized in that the suction box on the inlet side and / or on the outlet side to the sieve has seals directed towards the drying cylinder, for example brushes, which run transversely to the web running direction and essentially over the the entire width of the paper web or dryer fabric is sufficient.
  • suction box has cover plates on its end faces that cover the room from the suction box to the dryer fabric with the paper web attached to it or to the free dryer fabric or to the circumference of the guide roller that is not touched by the screen seal it.
  • a particularly favorable development of the invention is characterized in that that the axis of the guide roller from the vertical center plane of two adjacent drying cylinder in the direction of the web running direction first drying cylinder is moved.
  • This configuration is used especially at high machine speeds, i.e. high Speeds of the paper web, a particularly good contact of the paper web reached to the dryer fabric when draining from the drying cylinder. In In this area there is therefore only a very short free pull of the paper web to the following drying cylinder.
  • FIG. 1 shows a section of a cylinder dryer, in to which the invention is applied
  • FIG. 2 shows a variant of the invention
  • Fig. 3 shows a further variant of the invention
  • Fig. 4 shows a detail 3
  • FIG. 5 a section along the line V-V in FIG. 2 shows.
  • the cylinder dryer shown in Fig. 1 of a paper machine consists in essentially from a series of upper drying cylinders 1, 2, 3 as well a row of lower drying cylinders 4, 5, 6, around which the paper web 7 to be led.
  • the paper web 7 lies directly on the individual drying cylinders 1 to 6.
  • a top wire 8 This top wire is from the Separated paper web and guided over upper (screen) guide rollers 10, 11.
  • Corresponding a lower sieve 9 runs over the lower drying cylinders 4, 5, 6, which is guided over lower (screen) guide rollers 12, 13.
  • Fig. 2 shows a larger section for the first variant of the Air blowing device.
  • the paper web 7 runs together with the upper dryer fabric 8 upper drying cylinder 3 and onto the (sieve) rotating in direction 29 Guide roller 11 on.
  • the paper web 7 now runs in a free train to the lower one Drying cylinder 5.
  • the upper drying wire 8 is guided by the guide roller 11 deflected and runs to the next upper drying cylinder 2, where it is the already there paper web 7 more strongly to the upper drying cylinder 2 presses.
  • 20 air in through an air injection tube the pocket 24 blown.
  • FIG. 3 shows the analog situation with another embodiment of the Air injection pipe.
  • a scraper bar 18 specially designed as a tube is used here.
  • FIG. 4 shows an enlarged section of the lower drying cylinder 4 together with the scraper beam 18 designed as an air injection device.
  • the fresh air enters space 40 of doctor bar 18 introduced and through a distributor 41, which preferably bores contains, evenly directed into a room 42 and then in the direction 38 or 39 blown into the pocket 22.
  • FIG. 5 now shows a section along the line V-V in FIG. 2.
  • This section line was chosen, in particular the exhaust or suction openings to be able to represent.
  • the air injection pipe 20 is through a nozzle 43 air supplied.
  • the blow-out into the pocket 24 can, on the one hand, be carried out by Holes 44 arranged in rows or through correspondingly arranged slots 45 done.
  • Holes 44 arranged in rows or through correspondingly arranged slots 45 done.
  • the suction in the suction box 15 can also through holes 46 arranged in rows or through accordingly arranged slots 47 take place.
  • cover plates 35 and 36 on the end faces of the suction box intended.
  • the outlet openings 44 and 45 can also be of different sizes have different amounts in the appropriate direction blow out.
  • the suction openings 46 and 47 can also be used have different sizes to get the most out of the space between Suction box and free wire or from the incoming gusset on the Vacuum guide roller. It proves to be particularly favorable for the extraction if the distance between guide roller and suction box is between 1 and 20 mm, is preferably 4 to 10 mm.
  • the air injection device can also take other forms, e.g. to the Gussets have a triangular shape. Also, for example optimal design of the flow in the pocket additional Air vents in further directions be provided.

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Description

Die Erfindung betrifft ein Verfahren in einem Zylindertrockner einer Papiermaschine, in dem die Papierbahn an den Oberzylindern unter Verwendung eines Obersiebes und an den Unterzylindern unter Verwendung eines Untersiebes geführt wird, wobei die Siebe von den Trockenzylindern und in deren Zwischenräumen angeordneten Leitwalzen geführt werden, derart, daß die Bahn an der Oberzylinderreihe vom Obersieb im direkten Trocknungskontakt mit der Oberfläche der Oberzylinder und entsprechend vom Untersieb gegen die Oberfläche der Unterzylinder gepreßt wird und die Bahn von einer Zylinderreihe zur anderen über eine bestimmte Strecke als freier Zug geführt wird, wobei Luft eingeblasen wird und die Luft, insbesondere erhitzte Frischluft direkt in die vom Trockensieb und der Papierbahn gebildeten Taschen eingeblasen wird. Die Erfindung betrifft weiters eine Vorrichtung zur Durchführung des Verfahrens, die für einen Zylindertrockner einer Papiermaschine, mit einer Zweisiebführung vorgesehen ist, der eine Luftblaseinrichtung aufweist wobei die Lufteinblaseinrichtung, insbesondere ein Lufteinblasrohr, in der vom Trockensieb und der Papierbahn gebildeten Tasche vorgesehen ist.The invention relates to a method in a cylinder dryer of a paper machine, where using the paper web on the top cylinders an upper sieve and on the lower cylinders using a lower sieve is guided, with the screens from the drying cylinders and in their Intermediate guide rollers are guided such that the Web on the top cylinder row from the top wire in direct drying contact with the surface of the top cylinder and accordingly from the bottom wire the surface of the lower cylinder is pressed and the web of one Row of cylinders led to the other as a free train over a certain distance is, whereby air is blown and the air, in particular heated fresh air directly into the pockets formed by the dryer fabric and the paper web is blown in. The invention further relates to a device for performing of the procedure for a cylinder dryer of a paper machine, is provided with a two-wire guide, the air blowing device having the air injection device, in particular a Air injection tube, in the one formed by the dryer fabric and the paper web Bag is provided.

Es sind Verfahren und Vorrichtungen für einen Papiermaschinen-Zylindertrockner mit Zweisiebführung bekannt, bei denen Luft eingeblasen wird. Dies geschieht bei den bekannten Verfahren bzw. Vorrichtungen im Bereich zwischen den Trockenzylindern, d.h. im Bereich des Trockensiebes. Es wird hier in vielen Fällen versucht, durch eine Injektorwirkung in den Zwickeln des Trockensiebes mit der Leitwalze einen Unterdruck zu erzeugen, um ein Abheben der Bahn vom Trockensieb und ein Bahnflattern zu verhindern. Durch das Einblasen von Luft in diesen Bereich besteht jedoch weiterhin die große Gefahr des Abblasens der Papierbahn vom Trockensieb. Weiters kann insbesondere bei höheren Maschinengeschwindigkeiten, d.h. höheren Geschwindigkeiten der Papierbahn, keine ausreichende Trocknung mehr erzielt werden, da in den sogenannten Taschen, d.h. in den vom Trockensieb und der Papierbahn gebildeten Räumen zwischen Leitwalze und gegenüberliegendem Trockenzylinder, nur mehr warme, feuchte Luft enthalten ist.They are methods and devices for a paper machine cylinder dryer known with two-wire guide, in which air is blown. This happens in the known methods and devices in the field between the drying cylinders, i.e. in the area of the dryer fabric. It will tried here in many cases by an injector effect in the gussets of the Drying screen with the guide roller to create a vacuum to lift off to prevent the web from drying dryer and web flutter. By however, blowing air into this area continues to be the major Danger of the paper web blowing off the dryer fabric. Furthermore, in particular at higher machine speeds, i.e. higher Paper web speeds, insufficient drying can be achieved because in the so-called pockets, i.e. in the dryer fabric and the spaces formed between the paper roll and guide roller Drying cylinder, only warm, moist air is contained.

Weiters sind aus der GB 2 091 400 ein Verfahren und eine Vorrichtung bekannt, bei der Luft in den Bereich zwischen dem freien Zug der Papierbahn, der Oberfläche des Trocknungszylinders und der siebbespannten Leitwalze eingeblasen wird. Ähnliche Vorrichtungen sind z.B. aus der DE 1 120 262, US 1,660,640 oder US 3,263,344 bekannt. In allen diesen Fällen besteht bei schneller laufenden Papiermaschinen die Gefahr, daß sich in diesem Bereich auch durch mitgeschleppte Luft ein Überdruck aufbaut und dadurch die Papierbahn abreißt.Furthermore, GB 2 091 400 describes a method and a device known in the air in the area between the free train of the paper web, the surface of the drying cylinder and the sieve Guide roller is blown. Similar devices are e.g. from DE 1 120 262, US 1,660,640 or US 3,263,344 known. In all of these cases there is a risk with faster running paper machines that in this area also builds up excess pressure due to air being carried along and thereby tearing off the paper web.

Die Erfindung soll nun die Nachteile der bekannten Verfahren und Vorrichtungen vermeiden, und speziell bei hohen Maschinengeschwindigkeiten eine ausreichende Trocknung gewährleisten, und die Gefahr eines Abblasens der Papierbahn vom Trockensieb sowie von Bahnabrissen durch Bahnflattern hintanhalten.The invention now aims at the disadvantages of the known methods and devices avoid, and especially at high machine speeds ensure adequate drying, and the risk of blowing off the Paper web from dryer fabric and web breaks through web flutter hold on.

Die Erfindung ist daher dadurch gekennzeichnet, daß zusätzlich Luft durch das Trockensieb abgesaugt wird, wobei die Absaugung aus dem einlaufenden Zwickel, gebildet durch das Auflaufen vom Trockensieb auf eine Leitwalze, d.h. aus dem Bereich zwischen dem vom Trockenzylinder und dem freien Umfang der Leitwalze gemeinsam ablaufenden Trockensieb mit der Papierbahn, erfolgt und die abgesaugte Luftmenge zumindest im wesentlichen der eingeblasenen Luftmenge entspricht. Durch die Absaugung der Luft durch das Trockensieb kann eine gleichmäßige Absaugung quer zur Bahnlaufrichtung erzielt werden, so daß ungünstige Querströmungen der Luft verhindert werden können. Auch werden dadurch Überdrücke in diesem Bereich vermieden, so daß die Gefahr von Abrissen der Papierbahn minimiert wird. Dies trifft vor allem dann zu, wenn die abgesaugte Luftmenge zumindest im wesentlichen der eingeblasenen Luftmenge entspricht.The invention is therefore characterized in that in addition air the dryer fabric is sucked off, the suction from the incoming Gusset, formed by running from the dryer fabric onto a guide roller, i.e. from the area between that of the drying cylinder and the free circumference of the guide roller running together with the dryer Paper web, takes place and the amount of air extracted at least essentially corresponds to the amount of air blown in. By suction of the Air through the dryer can ensure even suction across the Web running direction can be achieved so that unfavorable cross currents Air can be prevented. This also causes overpressures in this Avoided area, so that the risk of tearing off the paper web is minimized. This is especially true when the amount of air extracted corresponds at least essentially to the amount of air blown in.

Eine Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die Lufteinblasung in gezielte Richtung erfolgt, wobei die Luft zumindest in zwei unterschiedliche Richtungen eingeblasen werden kann. Durch die gezielte Lufteinblasung kann in den Taschen eine vorteilhafte Strömung entlang des Trockenzylinders bzw. der Papierbahn erzielt werden, wobei durch die Konvektion die Trocknung noch verbessert wird.An embodiment of the invention is characterized in that the Air is blown in a targeted direction, with the air at least in two different directions can be blown. Through the targeted Air injection can create a beneficial flow along the pockets Drying cylinder or the paper web can be achieved, with the Convection drying is still improved.

Eine Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Luft vor der Einblasung in die Taschen vorverteilt wird, um eine gleichmäßige Luftzufuhr zu erreichen. Durch diese Vorverteilung und die gleichmäßige Luftzufuhr, die insbesondere quer zur Bahnlaufrichtung erfolgt, wird auch eine entsprechende gleichmäßige Trocknung der Papierbahn gewährleistet. A further development of the invention is characterized in that the air before being blown into the pockets it is pre-distributed to give an even To reach air supply. Through this pre-distribution and the even Air supply, which is particularly transverse to the web running direction, is also a corresponding uniform drying of the paper web is guaranteed.

Eine besonders günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß eine Luftmenge von 100 bis 500 m3 pro Stunde und Meter Arbeitsbreite, vorzugsweise von 200 bis 300 m3 pro Stunde und Meter Arbeitsbreite, eingeblasen wird. Durch die Einblasung dieser Luftmengen ergibt sich eine besonders gute Trocknung der Papierbahn.A particularly favorable development of the invention is characterized in that that an air volume of 100 to 500 m3 per hour and meter Working width, preferably from 200 to 300 m3 per hour and meter Working width, is blown. By blowing in these amounts of air the paper web dries particularly well.

Eine weitere Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die Geschwindigkeit der eingeblasenen Luftstrahlen im Bereich von 10 m/s bis 50 m/s, zweckmäßig zwischen 20 m/s und 40 m/s liegt. Durch diese Geschwindigkeit der Luftstrahlen kann vorteilhaft eine Strömung im Bereich der Taschen erzielt werden, wobei eine Beeinträchtigung der Führung der Papierbahn dadurch nicht erfolgt.Another embodiment of the invention is characterized in that the speed of the blown air jets in the range of 10 m / s up to 50 m / s, suitably between 20 m / s and 40 m / s. Through this Velocity of the air jets can advantageously be a flow in the area the pockets can be achieved, impairing the leadership of the This does not result in paper web.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Geschwindigkeit der Papierbahn im Bereich von 600 bis 1500 m/min, vorzugsweise zwischen 1000 bis 1400 m/min liegt. Bei einer derartigen Maschinengeschwindigkeit bzw. Geschwindigkeit der Papierbahn wird eine optimale Trocknung erzielt, d.h. es erfolgt weder eine zu geringe Trocknung noch eine Übertrocknung des Papiers.A favorable development of the invention is characterized in that the speed of the paper web in the range from 600 to 1500 m / min, is preferably between 1000 to 1400 m / min. With such a Machine speed or speed of the paper web becomes one optimal drying achieved, i.e. there is neither insufficient drying another overdrying of the paper.

Die erfindungsgemäße Vorrichtung, die für einen Zylindertrockner einer Papiermaschine mit einer Zweisiebführung vorgesehen ist, der eine Luftblaseinrichtung aufweist, wobei die Luftblaseinrichtung, insbesondere ein Lufteinblasrohr, in der vom Trockensieb und der Papierbahn gebildeten Tasche vorgesehen ist, ist dadurch gekennzeichnet, daß zusätzlich ein Saugkasten in den zwischen den nebeneinander liegenden Trockenzylindern verbleibenden Räumen, die von den über den nebeneinander liegenden Trockenzylindern laufenden Trockensiebe und den freien Sektoren der das betreffende Trockensieb führenden Leitwalze begrenzt sind, vorgesehen ist. Durch die Anordnung eines zusätzlichen Saugkastens läßt sich besonders günstig die in die Taschen eingeblasene Luft absaugen, wobei weiters eine besonders günstige Montage der Saugkästen erfolgen kann. Durch diese örtliche Anbringung des Saugkastens ist weiters gewährleistet, daß eine Verletzung der Papierbahn durch den Saugkasten ausgeschlossen wird, da lediglich das Trockensieb an der Oberseite des Saugkastens entlang geführt wird.The device according to the invention for a cylinder dryer Paper machine with a two-wire guide is provided, which is an air blowing device has, the air blowing device, in particular a Air injection tube, in the one formed by the dryer fabric and the paper web Bag is provided, is characterized in that an additional Suction box in the drying cylinders lying next to each other remaining spaces from those above each other Drying cylinders running dryer fabrics and the free sectors of that guide roller in question are provided, is provided. The arrangement of an additional suction box makes it particularly easy suck off the air blown into the pockets cheaply, furthermore one particularly favorable assembly of the suction boxes can be done. Through this local attachment of the suction box is further guaranteed that a Injury to the paper web through the suction box is excluded because only the dryer fabric is guided along the top of the suction box becomes.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Luftblaseinrichtung, insbesondere in Reihen angeordnete Blasöffnungen, insbesondere Löcher und/oder Schlitze für den Luftaustritt aufweist, wobei mehrere Lochreihen bzw. Schlitze vorgesehen sein können, die in unterschiedliche Blasrichtung gerichtet sind. Durch eine derartige Ausgestaltung der Luftblaseinrichtung läßt sich die Luft besonders günstig in die Taschen einbringen und die Luftströmung in der Tasche entsprechend für eine optimale Trocknung beeinflussen.A favorable development of the invention is characterized in that the air blowing device, in particular blowing openings arranged in rows, in particular has holes and / or slots for the air outlet, wherein several rows of holes or slots can be provided, which in different Blowing direction are directed. With such a configuration The air blowing device allows the air to be put into the pockets particularly cheaply bring in and the air flow in the bag accordingly for optimal Influence drying.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß in der Luftblaseinrichtung eine Einrichtung zur Vorverteilung der Luft zur gleichmäßigen, zweckmäßig senkrechten, Ausblasung vorgesehen ist. Durch diese Vorverteileinrichtung kann die Strömung in den Taschen besonders günstig beeinflußt werden, wobei Strömungen in Querrichtung zur Bahnlaufrichtung vermieden werden. Um ein entsprechendes Druckgefälle in der Luftblaseinrichtung auszugleichen, kann diese auch von den Anspeisungsseiten konisch zulaufend ausgeführt sein, wobei auch eine Anspeisung von beiden Seiten möglich ist.A favorable embodiment of the invention is characterized in that in the air blowing device a device for pre-distributing the air for uniform, appropriately vertical, blow-out is provided. By this pre-distributing device is particularly suitable for the flow in the pockets are influenced favorably, with flows in the transverse direction to the web running direction be avoided. To a corresponding pressure drop in the To compensate for the air blowing device, this can also be done from the feed side be designed to be conical, with a feed of is possible on both sides.

Eine besonders günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die Lufteinblaseinrichtung als Schaberbalken ausgebildet ist, wobei der Schaber als Luftleiteinrichtung wirken kann. Durch diese Kombination der Lufteinblaseinrichtung mit dem Schaber ist eine besonders günstige Anbringung gewährleistet, wobei auch ein zusätzlicher technologischer Vorteil durch die Wirkung des Schabers als Luftleiteinrichtung erzielt wird.A particularly favorable embodiment of the invention is characterized in that that the air injection device is designed as a scraper bar, the scraper can act as an air guide. Through this Combination of the air injection device with the scraper is a special one convenient attachment guaranteed, including an additional technological Advantage achieved by the action of the scraper as an air guide becomes.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß der Saugkasten an der Einlaufseite und/oder an der Auslaufseite zum Sieb zum Trockenzylinder gerichtete Dichtungen, beispielsweise Bürsten, aufweist, die quer zur Bahnlaufrichtung verlaufen und im wesentlichen über die gesamte Breite der Papierbahn bzw. des Trockensiebes reichen. Durch diese Dichtungen kann erreicht werden, daß keine zusätzliche Luft in den Zwickel zwischen Trockensieb und Leitwalze gelangt und dadurch ein Überdruck vermieden wird, der ein Abheben der Bahn vom Trockensieb sowie ein Bahnflattern bewirken könnte. Andererseits wird dadurch erreicht, daß lediglich Luft aus den Taschen und nicht aus der sonstigen Umgebung in den Saugkasten eingesaugt wird.A favorable embodiment of the invention is characterized in that the suction box on the inlet side and / or on the outlet side to the sieve has seals directed towards the drying cylinder, for example brushes, which run transversely to the web running direction and essentially over the the entire width of the paper web or dryer fabric is sufficient. By these seals can be achieved that no additional air in the Gusset gets between the dryer fabric and the guide roller, causing an overpressure is avoided, a lifting of the web from the dryer and as well Could cause web flutter. On the other hand it is achieved that only Air from the pockets and not from the surrounding area in the Suction box is sucked in.

Eine weitere Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß der Saugkasten an seinen Stirnseiten Abdeckplatten aufweist, die den Raum vom Saugkasten zum Trockensieb mit der daran anliegenden Papierbahn bzw. zum freien Trockensieb oder zum nicht siebberührten Umfang der Leitwalze hin, abdichten. Durch diese zusätzlichen Abdichtungen wird die Längsströmung der Luft in den Taschen bzw. zum Saugkasten hin unterstützt und eine seitliche Einströmung der Luft verhindert, wodurch wiederum die Absaugung aus den Taschen besonders effektiv wird.Another embodiment of the invention is characterized in that the suction box has cover plates on its end faces that cover the room from the suction box to the dryer fabric with the paper web attached to it or to the free dryer fabric or to the circumference of the guide roller that is not touched by the screen seal it. Through these additional seals the Longitudinal flow of air in the pockets or towards the suction box is supported and prevents air from flowing in from the side, which in turn the suction from the pockets becomes particularly effective.

Eine besonders günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Achse der Leitwalze aus der vertikalen Mittelebene zweier nebeneinander liegender Trockenzylinder in Richtung zum in Bahnlaufrichtung ersten Trockenzylinder verschoben ist. Durch diese Ausgestaltung wird insbesondere bei hohen Maschinengeschwindigkeiten, d.h. hohen Geschwindigkeiten der Papierbahn, ein besonders guter Kontakt der Papierbahn zum Trockensieb beim Ablaufen vom Trockenzylinder erreicht. In diesem Bereich ergibt sich somit nur ein sehr kurzer freier Zug der Papierbahn zum nachfolgenden Trockenzylinder.A particularly favorable development of the invention is characterized in that that the axis of the guide roller from the vertical center plane of two adjacent drying cylinder in the direction of the web running direction first drying cylinder is moved. Through this configuration is used especially at high machine speeds, i.e. high Speeds of the paper web, a particularly good contact of the paper web reached to the dryer fabric when draining from the drying cylinder. In In this area there is therefore only a very short free pull of the paper web to the following drying cylinder.

Im nachfolgenden wird die Erfindung nun anhand der Zeichnungen beispielhaft erläutert, wobei Fig. 1 einen Ausschnitt eines Zylindertrockners zeigt, in dem die Erfindung angewendet wird, Fig. 2 eine Variante der Erfindung darstellt, Fig. 3 eine weitere Variante der Erfindung darstellt, Fig. 4 einen Ausschnitt aus Fig. 3 und Fig. 5 einen Schnitt gemäß der Linie V-V in Fig. 2 zeigt.In the following, the invention will now be used as an example with reference to the drawings explained, wherein Fig. 1 shows a section of a cylinder dryer, in to which the invention is applied, FIG. 2 shows a variant of the invention, Fig. 3 shows a further variant of the invention, Fig. 4 shows a detail 3 and FIG. 5 a section along the line V-V in FIG. 2 shows.

Der in Fig. 1 dargestellte Zylindertrockner einer Papiermaschine besteht im wesentlichen aus einer Reihe von oberen Trockenzylindern 1, 2, 3 sowie einer Reihe von unteren Trockenzylindern 4, 5, 6, um die die Papierbahn 7 geführt wird. Die Papierbahn 7 liegt dabei direkt auf den einzelnen Trockenzylindern 1 bis 6 auf. Um einen entsprechenden Kontakt zwischen Papierbahn 7 und Trockenzylindern 1 bis 6 herzustellen, verläuft über die oberen Trockenzylinder 1, 2, 3, ein Obersieb 8. Dieses Obersieb wird von der Papierbahn getrennt und über obere (Sieb-) Leitwalzen 10, 11, geführt. Entsprechend verläuft ein Untersieb 9 über die unteren Trockenzylinder 4, 5, 6, welches über untere (Sieb-) Leitwalzen 12, 13 geführt wird. Durch die Papierbahn 7 und das Obersieb 8 bzw. das Untersieb 9 werden über bzw. unter den entsprechenden Trockenzylindern sogenannte Taschen 22, 23, 24, 25 gebildet. In diesen Taschen bildet sich durch das verdampfte Wasser aus der Papierbahn feuchte Luft. Diese weitestgehend gesättigte feuchte Luft behindert in weiterer Folge die weitere Trocknung der Papierbahn. Es wird somit erfindungsgemäß in diese Taschen 22 bis 25 direkt erhitzte Frischluft eingeblasen. Dies kann nach einer Ausgestaltung durch Lufteinblasrohre 20,21 geschehen. Bei einer anderen Ausführungsvariante kann die Luft durch speziell ausgeführte Schaberbalken 18,19 zugeführt werden.The cylinder dryer shown in Fig. 1 of a paper machine consists in essentially from a series of upper drying cylinders 1, 2, 3 as well a row of lower drying cylinders 4, 5, 6, around which the paper web 7 to be led. The paper web 7 lies directly on the individual drying cylinders 1 to 6. To ensure appropriate contact between paper web 7 and drying cylinders 1 to 6 runs over the top Drying cylinder 1, 2, 3, a top wire 8. This top wire is from the Separated paper web and guided over upper (screen) guide rollers 10, 11. Corresponding a lower sieve 9 runs over the lower drying cylinders 4, 5, 6, which is guided over lower (screen) guide rollers 12, 13. Through the Paper web 7 and the top wire 8 and the bottom wire 9 are over or so-called pockets 22, 23 under the corresponding drying cylinders, 24, 25 formed. The vaporized water forms in these pockets moist air from the paper web. This largely saturated moisture Air subsequently impedes the further drying of the paper web. It is thus directly heated according to the invention in these pockets 22 to 25 Fresh air blown in. According to one embodiment, this can be done by Air injection tubes 20, 21 happen. In another version the air can be fed through specially designed scraper bars 18, 19 become.

Fig. 2 zeigt einen größeren Ausschnitt für die erste Variante der Lufteinblaseinrichtung. Es sind hier die oberen Trockenzylinder 2,3 sowie der untere Trockenzylinder 5 dargestellt, die sich in die Richtung 26 bzw. 27 drehen. Die Papierbahn 7 läuft gemeinsam mit dem oberen Trockensieb 8 vom oberen Trockenzylinder 3 ab und auf die in Richtung 29 drehende (Sieb-) Leitwalze 11 auf. Dort werden Papierbahn 7 und oberes Trockensieb 8 getrennt. Die Papierbahn 7 verläuft nun in einem freien Zug zum unteren Trockenzylinder 5. Das obere Trockensieb 8 wird durch die Leitwalze 11 umgelenkt und läuft zum nächsten oberen Trockenzylinder 2, wobei es die bereits dort aufgelaufene Papierbahn 7 stärker an den oberen Trockenzylinder 2 preßt. Um eine ausreichende Trocknung der Papierbahn auch bei hohen Geschwindigkeiten zu gewährleisten, wird durch ein Lufteinblasrohr 20 Luft in die Tasche 24 eingeblasen. Diese Luft erzeugt nun einen geringen Überdruck, wobei die frei verlaufende Papierbahn 7 in ihrer Laufrichtung beeinflußt wird. Dieser Beeinflussung wird durch den Einsatz eines Saugkastens 15 entgegengewirkt. Dazu wird Luft aus den Taschen 24 durch das obere Trockensieb 8 hindurch in den Kasten 15 gesaugt und über eine Rohrleitung in Richtung 34 abgeführt. Um ein Abheben der Papierbahn 7 vom oberen Trockensieb 8 im Bereich des einlaufenden Zwickels 28 für die Leitwalze 11 zu verhindern, wird einerseits an der Oberkante des Saugkastens 15 eine Dichtung 32 angebracht. Durch diese Dichtung 32 wird ein Einsaugen von Luft in den Raum zwischen oberen Trockenzylinder 3 und Saugkasten 15, bedingt durch die Bewegung in Richtung 26, weitestgehend vermieden. Mitgeführte Luft wird in weiterer Folge in Richtung 30 in den Saugkasten 15 abgesaugt. Um die Absaugung effektiv zu machen und ein Einsaugen von Fehlluft zu vermeiden, wird zusätzlich im Bereich des weiteren Trockenzylinders 2 eine Dichtung 33 an der Saugkammer 15 angebracht. Dadurch wird verhindert, daß Falschluft, d.h. Luft aus der Umgebung in den Saugkasten 15 eingesaugt wird.Fig. 2 shows a larger section for the first variant of the Air blowing device. There are the upper drying cylinders 2, 3 and shown lower drying cylinder 5, which in the direction 26 and 27th rotate. The paper web 7 runs together with the upper dryer fabric 8 upper drying cylinder 3 and onto the (sieve) rotating in direction 29 Guide roller 11 on. There paper web 7 and upper dryer fabric 8 Cut. The paper web 7 now runs in a free train to the lower one Drying cylinder 5. The upper drying wire 8 is guided by the guide roller 11 deflected and runs to the next upper drying cylinder 2, where it is the already there paper web 7 more strongly to the upper drying cylinder 2 presses. To ensure adequate drying of the paper web even at high To ensure speeds, 20 air in through an air injection tube the pocket 24 blown. This air now creates a slight overpressure, the freely running paper web 7 is influenced in its running direction. This influence is exerted by the use of a suction box 15 counteracted. For this purpose, air from the pockets 24 is passed through the upper one Dryer screen 8 sucked into the box 15 and in via a pipe Directed to 34. To lift the paper web 7 from the top Dryer screen 8 in the area of the incoming gusset 28 for the guide roller 11 prevent on the one hand at the upper edge of the suction box 15 Seal 32 attached. Air is sucked in through this seal 32 conditionally in the space between the upper drying cylinder 3 and suction box 15 largely avoided by moving in the direction of 26. Carried air is then sucked off in the direction of 30 into the suction box 15. To the Make extraction effective and avoid sucking in of incorrect air, a seal 33 is additionally applied in the area of the further drying cylinder 2 the suction chamber 15 attached. This prevents false air, i.e. Air from the environment is sucked into the suction box 15.

Fig. 3 zeigt die analoge Situation mit einer anderen Ausführungsform des Lufteinblasrohrs. Zusätzlich sind hier zum besseren Verständnis im Bereich der Tasche 22 Strömungspfeile eingetragen. Statt des Lufteinblasrohrs 20 der Fig. 2 findet hier ein speziell als Rohr ausgebildeter Schaberbalken 18 Verwendung. Fig. 3 shows the analog situation with another embodiment of the Air injection pipe. In addition, for better understanding in the area of Pocket 22 flow arrows entered. Instead of the air injection tube 20 of FIG. 2, a scraper bar 18 specially designed as a tube is used here.

In diesem Schaberbalken sind Ausblasöffnungen in Richtung 38 bzw. 39 vorgesehen, wobei der Schaber, der am unteren Trockenzylinder 4 allfällige Papierreste entfernt, als Luftleiteinrichtung dient. Weiters sind zusätzlich an den Stirnseiten des Saugkastens 14 Abdeckplatten 35 bzw. 36 vorgesehen, die die freien Zwischenräume zwischen oberem Trockenzylinder 2 und Saugkasten 14 bzw. Obersieb 8 und Saugkasten 14 abdecken. Dadurch wird ein Einsaugen von Falschluft von der Seite des Papiermaschinentrockners vermieden und die Effektivität der Absaugung aus der Tasche 22 noch weiter erhöht. Der Strömungsverlauf in der Tasche 22 ergibt sich im wesentlichen einerseits durch das Mitreissen von Luft an der Oberfläche der Trockenzylinder 4 bzw. der Leitwalze 10 sowie der Papierbahn 7. Weiters wird die Luftströmung wesentlich beeinflußt durch die Einblasung in Richtung 38 bzw. 39 sowie die Absaugung aus der Tasche 22 in Richtung 31 in den Saugkasten 14.In this scraper bar there are blow-out openings in the direction 38 or 39 provided, the scraper, 4 on the lower drying cylinder Remains of paper removed, used as an air guide. Furthermore, in addition to the End faces of the suction box 14 cover plates 35 and 36 provided that the free spaces between the upper drying cylinder 2 and suction box 14 or cover the upper sieve 8 and suction box 14. This will suck up of false air from the side of the paper machine dryer avoided and the Effectiveness of suction from the pocket 22 increased even further. The Flow course in the pocket 22 essentially results from entraining air on the surface of the drying cylinder 4 or Guide roller 10 and the paper web 7. Furthermore, the air flow becomes essential influenced by the blowing in direction 38 or 39 as well as the suction out of the pocket 22 in the direction 31 into the suction box 14.

Fig. 4 zeigt einen vergrößerten Ausschnitt des unteren Trockenzylinders 4 gemeinsam mit dem als Lufteinblaseinrichtung ausgeführten Schaberbalken 18. Es wird hierbei die Frischluft in den Raum 40 des Schaberbalkens 18 eingebracht und durch eine Verteileinrichtung 41, die vorzugsweise Bohrungen enthält, gleichmäßig in einen Raum 42 geleitet und anschließend in Richtung 38 bzw. 39 in die Tasche 22 ausgeblasen.4 shows an enlarged section of the lower drying cylinder 4 together with the scraper beam 18 designed as an air injection device. Here, the fresh air enters space 40 of doctor bar 18 introduced and through a distributor 41, which preferably bores contains, evenly directed into a room 42 and then in the direction 38 or 39 blown into the pocket 22.

Fig. 5 zeigt nun einen Schnitt entlang der Linie V-V in Fig. 2. Diese Schnittlinie wurde gewählt, um insbesondere die Ausblas- bzw. Einsaugöffnungen darstellen zu können. Dem Lufteinblasrohr 20 wird dabei durch einen Stutzen 43 Luft zugeführt. Die Ausblasung in die Tasche 24 kann einerseits durch in Reihen angeordnete Löcher 44 bzw. durch entsprechend angeordnete Schlitze 45 erfolgen. Zwischen Lufteinblasrohr 20 und Saugkasten 15 verläuft hierbei das obere Trockensieb 8. Die Einsaugung in den Saugkasten 15 kann ebenfalls durch in Reihen angeordnete Löcher 46 bzw. durch entsprechend angeordnete Schlitze 47 erfolgen. Um ein seitliches Einsaugen zu vermeiden sind hier Abdeckplatten 35 bzw. 36 an den Stirnseiten des Saugkastens vorgesehen. Um die Strömung in der Tasche noch günstiger zu beeinflußen, können die Ausblasöffnungen 44 bzw. 45 auch unterschiedliche Größen aufweisen, um unterschiedliche Mengen in die entsprechende Richtung auszublasen. Ebenfalls können die Einsaugöffnungen 46 bzw. 47 unterschiedliche Größen aufweisen, um optimal aus dem Raum zwischen Saugkasten und freien Siebzug bzw. aus dem einlaufenden Zwickel an der Leitwalze abzusaugen. Besonders günstig für die Absaugung erweist es sich, wenn der Abstand zwischen Leitwalze und Saugkasten zwischen 1 und 20 mm, vorzugsweise 4 bis 10 mm beträgt.FIG. 5 now shows a section along the line V-V in FIG. 2. This section line was chosen, in particular the exhaust or suction openings to be able to represent. The air injection pipe 20 is through a nozzle 43 air supplied. The blow-out into the pocket 24 can, on the one hand, be carried out by Holes 44 arranged in rows or through correspondingly arranged slots 45 done. Here runs between the air injection pipe 20 and the suction box 15 the upper dryer wire 8. The suction in the suction box 15 can also through holes 46 arranged in rows or through accordingly arranged slots 47 take place. To avoid side suction here are cover plates 35 and 36 on the end faces of the suction box intended. In order to influence the flow in the pocket even more favorably, the outlet openings 44 and 45 can also be of different sizes have different amounts in the appropriate direction blow out. The suction openings 46 and 47 can also be used have different sizes to get the most out of the space between Suction box and free wire or from the incoming gusset on the Vacuum guide roller. It proves to be particularly favorable for the extraction if the distance between guide roller and suction box is between 1 and 20 mm, is preferably 4 to 10 mm.

Die Erfindung ist nicht auf die dargestellten Ausführungsformen beschränkt, vielmehr kann die Lufteinblaseinrichtung auch andere Formen, wie z.B. an den Zwickel angepaßte Dreiecksform aufweisen. Auch können beispielsweise zur optimalen Gestaltung der Strömung in der Tasche zusätzliche Ausblasöffnungen bei der Lufteinblaseinrichtung in weitere Richtungen vorgesehen werden.The invention is not restricted to the illustrated embodiments, rather, the air injection device can also take other forms, e.g. to the Gussets have a triangular shape. Also, for example optimal design of the flow in the pocket additional Air vents in further directions be provided.

Claims (13)

  1. Process in a cylinder dryer of a paper machine, where the paper web is guided over top cylinders (1, 2, 3) using a top wire (8) and over bottom cylinders (4, 5, 6) using a bottom wire (9), with the wires (8, 9) being guided by the drying cylinders (1, 2, 3, 4, 5, 6) and the guide rolls (10, 11, 12, 13) arranged in between, in such a manner that the web (7) is pressed to the top cylinder (1, 2, 3) row by the top wire (8) in direct contact with the top cylinder surface and accordingly, is pressed to the bottom cylinder row by the bottom wire, and the web (7) being guided from one row of cylinders (1, 2, 3, respectively 4, 5, 6) to the other in an open draw over a certain distance, with air being blown in and the air, particularly heated fresh air, being blown directly into the pockets (22, 23, 24, 25) formed by the dryer wire (8, 9) and the paper web (7), characterised by supplementary air being extracted through the dryer wire (8, 9), advantageously from the area of the paper web running onto the guide roll (28) and with the extracted air flow rate corresponding at least essentially to the blow-in air flow rate.
  2. Process according to Claim 1, characterised by the blowing-in of air being targeted in a certain direction (38, 39), for instance at least in two different directions.
  3. Process according to Claim 1 or 2, characterised by the air being pre-distributed before air blow-in into the pockets (22, 23, 24, 25) in order to achieve uniform air inlet.
  4. Process according to one of the Claims 1 to 3, characterised by an air flow rate of 100 m3/h to 500 m3/h per m of working width, preferably 200 m3/h to 300 m3/h per m of working width, being blown in.
  5. Process according to one of the Claims 1 to 4, characterised by the speed of the air jets being in the range of 10 m/s to 50 m/s, usefully between 20 m/s and 40 m/s.
  6. Process according to one of the Claims 1 to 5, characterised by the speed of the web (7) being in the range of 600 m/min to 1500 m/min, preferably between 1000 m/min and 1400 m/min.
  7. Device for carrying out the process according to one of the Claims 1 to 6, provided for a two-wire cylinder dryer of a paper machine which has a device for air blow-in, with this air blow-in device (18, 19, 20, 21), particularly an air blow-in tube, being provided in the pocket (22, 23, 24, 25) formed by the dryer wire (8, 9) and the paper web (7), characterised by a suction box (14, 15, 16, 17) being additionally provided in the remaining spaces between adjacent drying cylinders (1, 2, 3, respectively 4, 5, 6) and delineated by the dryer wires (8, 9) running over adjacent drying cylinders, and by the free sectors of the guide roll (10, 11, 12, 13) guiding the dryer wire concerned.
  8. Device according to Claim 7, characterised by the device for blowing in air (18, 19, 20, 21) having holes (44) and/or slots (45), particularly arranged in rows, for air outlet, where several rows of holes respectively slots may be provided, which may point to different directions.
  9. Device according to Claim 7 or 8, characterised by the device for blowing in air (18, 19, 20, 21) being provided with a device (41) for pre-distribution of the air in view of uniform, usefully vertical blow-out.
  10. Device according to one of the Claims 7 to 9, characterised by the device for blowing in air being designed as doctor beam (18, 19), with the doctor (37) possibly acting as air guidance device.
  11. Device according to one of the Claims 7 to 10, characterised by the suction box (14, 15) having seals (32, 33), for instance brushes, at the inlet side and/or outlet side to the wire, showing in the direction of the drying cylinder (2, 3), these seals being arranged crosswise to the web running direction and essentially stretching across the entire width of the paper web (7) respectively of the dryer wire (8, 9).
  12. Device according to one of the Claims 7 to 11, characterised by the suction box (14) having cover plates (35, 36) at its front sides which seal off the space between the suction box (14) and the wire (8), with the paper web (7) resting against it, respectively seal off the free dryer wire (8) respectively the guide roll (10) circumference that is not in contact with the wire.
  13. Device according to one of the Claims 7 to 12, characterised by the axis of the guide roll (10, 11, 12, 13) being displaced off centre in relation to two adjacent drying cylinders (1, 2 respectively 2, 3 respectively 4, 5, respectively 5, 6) toward the first drying cylinder (2 respectively 3 respectively 5 respectively 6) viewed in the direction of the web run.
EP19950108417 1994-07-13 1995-06-01 Process and apparatus in a cylinder dryer of a papermaking machine with two dryer fabrics Expired - Lifetime EP0692569B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT137794A AT400728B (en) 1994-07-13 1994-07-13 METHOD AND DEVICE ON A PAPER MACHINE CYLINDER DRYER WITH A TWO-SCREEN GUIDE
AT1377/94 1994-07-13
AT137794 1994-07-13

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EP0692569A2 EP0692569A2 (en) 1996-01-17
EP0692569A3 EP0692569A3 (en) 1998-01-07
EP0692569B1 true EP0692569B1 (en) 2001-04-11

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Publication number Priority date Publication date Assignee Title
DE19544881A1 (en) * 1995-12-01 1997-06-12 Voith Sulzer Papiermasch Gmbh Machine for the production of a continuous web
DE10024296B4 (en) * 2000-05-17 2008-11-20 Voith Patent Gmbh Machine for producing a material web
FI121240B (en) 2001-03-23 2010-08-31 Metso Paper Automation Oy Arrangements at a paper machine as well as a blow box

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Publication number Priority date Publication date Assignee Title
BE340578A (en) * 1926-11-11
DE1120262B (en) * 1958-08-05 1961-12-21 Wiessner Ges Fuer Raumluftgest Drying section for paper, cardboard or pulp dewatering machines
US3263344A (en) * 1963-07-31 1966-08-02 Stickle Steam Specialties Co I Drying system for paper-making machinery and the like
FI62571C (en) * 1980-12-01 1983-01-10 Valmet Oy ANORDNING VID FLERCYLINDERTORK I EN PAPPERSMASKIN
US5600897A (en) * 1993-08-06 1997-02-11 J.M. Voith Gmbh Mixed dryer section including single-tier and double-tier drying groups with automatic ropeless threading

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DE59509168D1 (en) 2001-05-17
AT400728B (en) 1996-03-25
EP0692569A2 (en) 1996-01-17
ATA137794A (en) 1995-07-15
EP0692569A3 (en) 1998-01-07

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