EP1819872B1 - Drier section - Google Patents

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Publication number
EP1819872B1
EP1819872B1 EP05773999A EP05773999A EP1819872B1 EP 1819872 B1 EP1819872 B1 EP 1819872B1 EP 05773999 A EP05773999 A EP 05773999A EP 05773999 A EP05773999 A EP 05773999A EP 1819872 B1 EP1819872 B1 EP 1819872B1
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EP
European Patent Office
Prior art keywords
drying section
section according
roll
press
fibrous web
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Not-in-force
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EP05773999A
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German (de)
French (fr)
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EP1819872A1 (en
Inventor
Wolfgang Mayer
Peter Kahl
Torben Schlieckau
Roland Mayer
Roland Kurz
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1819872A1 publication Critical patent/EP1819872A1/en
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Publication of EP1819872B1 publication Critical patent/EP1819872B1/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
    • D21F5/18—Drying webs by hot air
    • D21F5/182—Drying webs by hot air through perforated cylinders

Definitions

  • the invention relates to a dryer section for a machine for producing a fibrous web, in particular paper, board or tissue web, and to a machine for producing a fibrous web with such a dryer section.
  • EP 0 989 232 A an analogous embodiment of a dryer section with a transfer line, in which the fibrous web is feasible starting from the last press nip of a press section on the straight or slightly curved transfer path to at least one support roller with an associated Impact flow dryer, wherein the support roller but here from the inside can be acted upon with compressed air.
  • the invention has for its object to provide an improved dryer section and an improved machine of the type mentioned, in which at the same time both at high machine speed
  • this object is achieved as described in claim 1 by a dryer section for a machine for producing a fibrous web, in particular paper, board or tissue web, in which the fibrous web, starting from the last press nip a press section via a straight or slightly curved transfer path to a particular larger support roller is guided with associated impingement dryer, through which the guided around the support roller fibrous web with a hot air and / or hot steam impact flow can be acted upon, wherein the transfer path is formed by a guided around two suction rolls sieve, one for holding the Faserstoffahn on the screen or more Foil and / or vacuum boxes are assigned, and wherein the first suction roll, the fibrous web decreases from a expiring from the press nip press belt or - felt or from a transfer belt and the second suction roll holds the fibrous web only at the deflection around this roller.
  • the fibrous web is preferably guided by at least two, in particular larger, back-up rolls, each with associated impingement dryer, wherein the fibrous web is advantageously passed without removal suction directly from the sieve looping around the first support roller on the sieve or the sieve looped around the second support roll.
  • the fibrous web can thus be transferred, for example, just before the second support roller on the sieve or directly on the sieve wrap around second support roller.
  • the moisture transverse profile of the fibrous web can be detected via a corresponding measuring device on the free side of the fibrous web.
  • separating devices for separating an edge strip or a transfer strip of the fibrous web in the area of the transfer line.
  • the fibrous web should not have any contact with a smooth press roll in the press section and come into contact with a smooth drying cylinder only in the dryer section after reaching a relatively high moisture content and thus a sufficient strength, ie after the or the impingement flow dryers. This excludes the possibility of stretching the fibrous web when it comes off a smooth lateral surface.
  • the region in which the second suction roll of the transfer line is surrounded except by the transfer felt and the fibrous web also by the guided around the first particular larger support roll with associated impingement dryer screen is variably adjustable.
  • the wrap-around region in question is preferably variably adjustable via an adjustable roller arranged within the loop of the support roller screen.
  • a respective support roller with associated impingement dryer can be acted upon by vacuum.
  • a respective impingement flow dryer may comprise at least one hot air and / or superheated steam hood.
  • each larger support roller is associated with only one hood.
  • the or the particular larger back-up rolls, each with an associated impingement flow dryer are arranged in the web running direction directly after the press section and before a cylinder drying section.
  • At least one impingement flow dryer is provided which is operable at a temperature of about 300 to about 550 ° C and / or at a blow-off speed of about 70 to about 130 m / s.
  • the hood of a respective impingement flow dryer can be provided, for example, with a perforated plate and / or slots as nozzles for the hot air or steam.
  • the diameter of the hole nozzles is advantageously in a range of about 4 to about 12 mm and preferably in one Range from about 6 to about 9 mm.
  • the proportion of the nozzles in the total area is advantageously about 2 to about 4%.
  • the hood of a respective impingement flow dryer preferably has a plurality of return air openings, via which the hot air can be sucked out together with the steam of the drying.
  • these return air openings are preferably covered with a perforated plate or grid, which in particular prevents shreds from entering these openings.
  • a respective hood wraps around the respective support roller in accordance with an angle of at least 80 ° and at most 180 °, wherein this wrap angle is preferably in a range of about 90 to about 130 °.
  • the hood of a respective impingement flow dryer preferably consists of a plurality of modules, each with a separate hot air or hot steam cycle over the width of the fibrous web, wherein the width of each module is preferably in a range of about 2 to about 4 m.
  • two impingement flow dryers are provided which are designed for a dry content increase of about 2 to about 10%, the corresponding dry content increase for papers having a basis weight of more than 60 g / m 2 in a range of about 2 to about 5% and for papers having a basis weight less than 60 g / m 2 in a range of about 4 to about 10%.
  • the hood of a respective impingement flow dryer is movably mounted and can be lifted, for example, for transfer, for cleaning and maintenance or for changing the screen of the respective support roller.
  • a respective back-up roll has a particular pattern of dripping with stripes having a larger open area than the remaining areas.
  • the strips can be provided in particular in the region of the lateral web edges.
  • a plurality of strips across the width may also be provided in the central region of the web.
  • a respective support roller is preferably not sucked over the relevant bearing, but by an outer box over the lateral surface.
  • a respective backup roll has a diameter of at least about 3 m.
  • a respective transfer suction box between the two suction rolls after the press section can in particular comprise vacuum generation by suction or by means of a foil effect.
  • the vacuum of a respective Foil- and / or vacuum box can be controlled and / or regulated, so that for transferring a sufficient vacuum generated or a high amount of air can be sucked, in operation when covered by the fibrous web but not too high vacuum with a strong Siebauslenkung occurs, ie it is sucked in operation only a smaller amount of air.
  • a respective foil and / or vacuum box is expediently adjustable in its position in order, for example, to compensate for a sieve deflection after the fibrous web has been completely transferred.
  • a respective Foil- and / or vacuum box is advantageously designed so that a short-term contact between the sieve and box after the transfer and before the time when the vacuum is adjusted down to the operating value, no damage to the screen or box and also not to Collapse of the vacuum can result.
  • a respective foil and / or vacuum box on the side facing the screen is preferably provided with rounded contact surfaces, Teflon strips and / or surfaces serving as spacers.
  • a respective foil and / or vacuum box is expediently provided with a lateral seal against the transfer screen.
  • this lateral seal may comprise, for example, an air knife and / or a side plate preferably made of Teflon.
  • a respective foil and / or vacuum box can be sealed, for example, by a Teflon plate and / or a scraper blade against the adjacent suction roll.
  • a respective foil and / or vacuum box is operated in operation with a vacuum in the range of about 50 to 1000 Pa, and preferably in the range of about 100 to about 600 Pa.
  • the transfer distance between the two suction rolls is expediently shorter than about 4 m and preferably shorter than about 3 m.
  • the transfer section can be horizontal or slightly inclined to the horizontal.
  • the inventive, a press section and a dryer section comprehensive machine for producing a fibrous web, in particular paper, board or tissue web is characterized in that it is provided with a dryer section according to the invention.
  • the press section preferably comprises at least one shoe press.
  • the press section is preferably designed so that the fibrous web does not come into contact with any smooth roller in this press section.
  • the press section consists only of one or more shoe presses.
  • the press section may comprise a tilted tandem or single shoe press.
  • the press section comprises a press arrangement with a roll press nip and a press nip.
  • the press section comprises a press arrangement with at least one Saugpresswalze.
  • At least one transfer belt may be provided in the press section.
  • the dry content after the press section is at least 40%, preferably at least 43%, for wood-free or specialty papers, and at least 46%, preferably at least 49%, for wood-containing papers (such as newsprint, SC, LWC, etc.).
  • the machine speed may be greater than about 800 m / min, preferably greater than about 1000 m / min for wood-free paper types, and in particular greater than about 1200 m / min, preferably greater than 1500 m / min for wood-containing papers.
  • the fibrous web in the press section should preferably not have any contact with a smooth press roll and only in the dryer section after reaching a relatively high moisture content and correspondingly sufficient strength, i. After the impingement flow dryers, come into contact with a smooth drying cylinder. It is thus ruled out that, when detaching from a smooth lateral surface, undesired stretching of the fibrous web can occur.
  • the sole figure of the drawing shows a schematic partial representation of a drying section 10 of a machine for producing a fibrous web, which may be in particular a paper, board or tissue web.
  • a larger back-up roll is meant, for example, a back-up roll whose diameter is greater than the diameter of a conventional drying cylinder.
  • a larger support roller has a diameter of at least 3 m.
  • the support roller 18 is looped by a sieve 22.
  • the fibrous web guided around the sieve wrap around the sieve 17 is subjected to a hot air and / or superheated steam flow by the impingement flow dryer 20.
  • the first back-up roll 18 is an upper back-up roll, i. the fibrous web is supplied to this roller from bottom to top and removed from top to bottom of this roller again.
  • the impingement dryer 20 is e.g. arranged in the upper region of this first support roller 18.
  • the transfer section 16 is formed by a screen 28 guided around two suction rollers 24, 26, to which one or more foil and / or vacuum boxes 30 are assigned to hold the fibrous web on the wire 28.
  • the first suction roll 24 removes the fibrous web from a press belt or felt running out of the press nip 12, while the second suction roll 26 holds the fibrous web only during the deflection around this roll. In the area of the first suction roll 24, the fibrous web can also be removed, for example, from a transfer belt.
  • a second, in particular larger support roller 34 is provided with associated impingement dryer 36.
  • the fibrous web without Abdgingsaugwalze directly from the first support roller 18 wraps around the screen 22 on the second support roller 34 looping around 38th or transferred directly to the sieve wrap around second support roller 34.
  • the transfer takes place immediately before the second support roller 34.
  • the wrapping region in question can be variably adjustable via an adjustable roller 40 arranged within the loop of the supporting roller screen 22.
  • the two support rollers 18, 34 are as well as the two boxes 30 each acted upon by vacuum.
  • the second back-up roll 34 is a lower roll, i. the fibrous web is supplied to this roll from top to bottom and removed from bottom to top of this roll.
  • the impingement dryer 36 is arranged here in the region of the lower right quadrant of the support roller 34.
  • the two support rollers 18, 34, each with associated impingement dryer 20, 36 can therefore be arranged in the web running direction directly after the press section 14 and before a cylinder drying section 42.
  • the two impingement-type dryers 20, 36 may each comprise a hot-air and / or superheated steam hood 44, 46.
  • the transfer line 16 is horizontal. In principle, however, it can also be slightly inclined to the horizontal.

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  • Drying Of Solid Materials (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

In a drier section (10) of a machine for producing a fibrous web, in particular, a paper, cardboard or tissue web, this fibrous web, starting from the last nip (12) of a press part (14), is guided over a straight or slightly curved transfer section (16) to an, in particular, larger backup roll (18) with an assigned impingement flow drier (20) by means of which the fibrous web guided around the backup roll (18) can be subjected to the action of an impingement flow consisting of hot air and/or hot steam. The transfer section (16) is formed by a screen (28) guided around two suction rolls (24, 26), and one or more film and/or vacuum cases (30) are assigned to said screen in order to hold the fibrous web on the screen (28). The first suction roll (24) removes the fibrous web from a press belt or press felt (32) exiting the nip (12) or removes it from a transfer belt, whereas the second suction roll (26) holds the fibrous web only when redirected around this roll.

Description

Die Erfindung betrifft eine Trockenpartie für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere Papier-, Karton- oder Tissuebahn, sowie eine Maschine zur Herstellung einer Faserstoffbahn mit einer solchen Trockenpartie.The invention relates to a dryer section for a machine for producing a fibrous web, in particular paper, board or tissue web, and to a machine for producing a fibrous web with such a dryer section.

Bei den meisten der bisher üblichen Mehrzylinder-Trockenpartien wird die Papierbahn zum Trocknen über mehrere dampfbeheizte Zylinder oder über eine Anordnung vom mehreren dampfbeheizten Zylindern und Siebsaugwalzen geführt. Insbesondere zu Beginn der Trocknung, wo die Papierbahn noch keine ausreichende Festigkeit besitzt, treten nun aber bezüglich der Bahnführung häufig Probleme auf, die insbesondere darauf zurückzuführen sind, dass die noch feuchte Bahn an den glatten Kontaktflächen kleben bleibt, die für eine hinreichende Wärmeübertragung zwingend notwendig sind. Entsprechend sind relativ hohe Züge erforderlich, die nun aber häufig zu Bahnabrissen und einer Überdehnung der Bahnränder führen. Demzufolge muss in der Regel dafür gesorgt werden, dass die Trocknung langsamer erfolgt, d.h. beispielsweise am Anfang ein niedrigerer Dampfdruck vorherrscht, was bedeutet, dass die erforderliche Trockenpartie insgesamt länger wird. Die zuvor genannten Probleme treten verstärkt bei höheren Bahngeschwindigkeiten auf.In most of the usual multi-cylinder dryer sections, the paper web is led to dry over several steam-heated cylinders or via an arrangement of several steam-heated cylinders and Siebsaugwalzen. Especially at the beginning of drying, where the paper web still does not have sufficient strength, but now occur with respect to the web guide often problems that are due in particular to the fact that the still wet web stick to the smooth contact surfaces, which is imperative for adequate heat transfer are. Accordingly, relatively high trains are required, but now often lead to web breaks and overstretching of the web edges. As a result, it is usually necessary to ensure that the drying takes place more slowly, ie. For example, at the beginning a lower vapor pressure prevails, which means that the required drying section becomes longer overall. The aforementioned problems increasingly occur at higher web speeds.

In der DE 199 35 138 A wurde bereits vorgeschlagen, am Anfang der Trockenpartie eine oder mehrere insbesondere größere Stützwalzen mit jeweils zugeordnetem Prallströmungstrockner einzusetzen.In the DE 199 35 138 A It has already been proposed, at the beginning of the dryer section, to use one or more, in particular larger, backing rolls, each with an associated impingement-flow dryer.

Aus der Druckschrift US 6,372,090 B1 ist eine Trockenpartie für eine Maschine zur Herstellung einer Faserstffbahn mit einer Transferstrecke vorbekannt, in der die Faserstoffbahn ausgehend vom letzten Pressspalt einer Pressenpartie über die gerade oder leicht gekrümmte Transferstrecke zu zumindest einer mit Vakuum beaufschlagbaren Stützwalze mit einem dieser zugeordnetem Prallströmtrockner führbar ist, durch den die um die jeweilige Stützwalze geführte Faserstoffbahn mit einer Heißluftprallströmung beaufschlagbar ist. Die Transferstrecke wird von einem, um zwei Saugwalzen geführten Sieb gebildet, wobei die erste Saugwalze die Faserstoffbahn von einem aus dem Pressspalt auslaufenden Pressband abnimmt und die zweite Saugwalze die Faserstoffbahn nur bei der Umlenkung um die Walze hält.From the publication US 6,372,090 B1 is a drying section for a machine for producing a Faserstffbahn with a transfer line previously known, in which the fibrous web starting from the last press nip a press section over the straight or slightly curved transfer line to at least one can be acted upon with vacuum backup roller with an associated impingement dryer can be guided by the guided around the respective support roller fibrous web with a hot air impact flow can be acted upon. The transfer section is formed by a screen guided around two suction rolls, wherein the first suction roll decreases the fibrous web from a press belt leaving the press nip, and the second suction roll holds the fibrous web only around the roll during the deflection.

Demgegenüber offenbart EP 0 989 232 A eine analoge Ausführung einer Trockenpartie mit einer Transferstrecke, in der die Faserstoffbahn ausgehend vom letzten Pressspalt einer Pressenpartie über die gerade oder leicht gekrümmte Transferstrecke zu zumindest einer Stützwalze mit einem dieser zugeordnetem Prallströmtrockner führbar ist, wobei die Stützwalze hier jedoch von innen mit Druckluft beaufschlagbar ist.In contrast, disclosed EP 0 989 232 A an analogous embodiment of a dryer section with a transfer line, in which the fibrous web is feasible starting from the last press nip of a press section on the straight or slightly curved transfer path to at least one support roller with an associated Impact flow dryer, wherein the support roller but here from the inside can be acted upon with compressed air.

Der Erfindung liegt die Aufgabe zugrunde, eine verbesserte Trockenpartie sowie eine verbesserte Maschine der eingangs genannten Art zu schaffen, bei denen insbesondere bei hoher Maschinengeschwindigkeit gleichzeitig sowohlThe invention has for its object to provide an improved dryer section and an improved machine of the type mentioned, in which at the same time both at high machine speed

eine möglichst optimale Trocknungsrate am Anfang der Trocknung als auch eine sichere Bahnführung gewährleistet ist. Zudem soll insbesondere auch eine problemlose Ausschuss-Entfernung möglich sein. Der Bahntransfer aus der Presse soll verbessert werden. Dabei soll insbesondere auch ein hinreichender Abstand zur ersten Stützwalze mit zugeordnetem Prallströmungstrockner sichergestellt sein, um Platz für eine eventuelle Haubenbewegung und die Siebführung zu gewinnen.the best possible drying rate at the beginning of drying and a secure web guide is guaranteed. In addition, especially a trouble-free rejects to be possible. The railway transfer from the press should be improved. In this case, in particular, a sufficient distance to the first support roller to be ensured with associated impingement dryer to gain space for a possible hood movement and the Siebführung.

Erfindungsgemäß wird diese Aufgabe wie in Anspruch 1 beschrieben gelöst durch eine Trockenpartie für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere Papier-, Karton- oder Tissuebahn, in der die Faserstoffbahn ausgehend vom letzten Pressnip einer Pressenpartie über eine gerade oder leicht gekrümmte Transferstrecke zu einer insbesondere größeren Stützwalze mit zugeordnetem Prallströmungstrockner geführt ist, durch den die um die Stützwalze geführte Faserstoffbahn mit einer Heißluft- und/oder Heißdampfprallströmung beaufschlagbar ist, wobei die Transferstrecke durch ein um zwei Saugwalzen geführtes Sieb gebildet ist, dem zum Halten der Faserstoffahn am Sieb ein oder mehrere Foil- und/oder Vakuumkästen zugeordnet sind, und wobei die erste Saugwalze die Faserstoffbahn von einem aus dem Pressnip auslaufenden Pressband oder - filz oder von einem Transferband abnimmt und die zweite Saugwalze die Faserstoffbahn nur bei der Umlenkung um diese Walze hält. Dabei ist die Faserstoffbahn bevorzugt um wenigstens zwei insbesondere größere Stützwalzen mit jeweils zugeordnetem Prallströmungstrockner geführt, wobei die Faserstoffbahn vorteilhafterweise ohne Abnahmesaugwalze direkt vom die erste Stützwalze umschlingenden Sieb auf das die zweite Stützwalze umschlingende Sieb bzw. die siebumschlungene zweite Stützwalze übergeben wird. Die Faserstoffbahn kann also beispielsweise kurz vor der zweiten Stützwalze auf deren Sieb oder unmittelbar auf die siebumschlungene zweiten Stützwalze übergeben werden.According to the invention, this object is achieved as described in claim 1 by a dryer section for a machine for producing a fibrous web, in particular paper, board or tissue web, in which the fibrous web, starting from the last press nip a press section via a straight or slightly curved transfer path to a particular larger support roller is guided with associated impingement dryer, through which the guided around the support roller fibrous web with a hot air and / or hot steam impact flow can be acted upon, wherein the transfer path is formed by a guided around two suction rolls sieve, one for holding the Faserstoffahn on the screen or more Foil and / or vacuum boxes are assigned, and wherein the first suction roll, the fibrous web decreases from a expiring from the press nip press belt or - felt or from a transfer belt and the second suction roll holds the fibrous web only at the deflection around this roller. In this case, the fibrous web is preferably guided by at least two, in particular larger, back-up rolls, each with associated impingement dryer, wherein the fibrous web is advantageously passed without removal suction directly from the sieve looping around the first support roller on the sieve or the sieve looped around the second support roll. The fibrous web can thus be transferred, for example, just before the second support roller on the sieve or directly on the sieve wrap around second support roller.

In der Transferstrecke kann das Feuchtequerprofil der Faserstoffbahn über eine entsprechende Messeinrichtung auf der freien Seite der Faserstoffbahn erfasst werden.In the transfer section, the moisture transverse profile of the fibrous web can be detected via a corresponding measuring device on the free side of the fibrous web.

Es kann des weiteren auch vorteilhaft sein, im Bereich der Transferstrecke Trenneinrichtungen zur Abtrennung eines Randstreifens oder eines Überführstreifens der Faserstoffbahn anzuordnen.Furthermore, it can also be advantageous to arrange separating devices for separating an edge strip or a transfer strip of the fibrous web in the area of the transfer line.

Es ist somit bei einer hohen Trocknungsleistung eine gute Ausschussentfernung durch beispielsweise nur eine untenliegende Haube möglich. Zudem ist ein optimaler Transfer der Faserstoffbahn von der Pressenpartie zum ersten Prallströmungs- oder Impingement-Trockner mit ausreichend Platz für die Siebführung sichergestellt. Im Vergleich zu einer herkömmlichen Mehrzylinder-Trockenpartie ergibt sich ein höheres Geschwindigkeitspotenzial aufgrund der Trockengehaltssteigerung im Prallströmungstrockner und der damit einhergehenden Festigkeitssteigerung der noch nassen Faserstoffbahn. Schließlich ergeben sich auch entsprechende faualitätsverbesserungen der Faserstoffbahn bezüglich Volumen, Porosität und Spaltfestigkeit.It is thus possible with a high drying performance good reject removal by, for example, only a lower hood. In addition, an optimal transfer of the fibrous web from the press section to the first impingement or impingement dryer with sufficient space for the wire guide is ensured. Compared to a conventional multi-cylinder dryer section, there is a higher speed potential due to the dry content increase in the impingement dryer and the concomitant increase in the strength of the still wet fibrous web. Finally, there are also corresponding faualitätsverbesserungen the fibrous web in terms of volume, porosity and gap strength.

Zweckmäßigerweise soll die Faserstoffbahn in der Pressenpartie keinen Kontakt mit einer glatten Presswalze haben und erst in der Trockenpartie nach Erreichen eines relativ hohen Feuchtegehaltes und damit einer ausreichenden Festigkeit, d.h. nach dem bzw. den Prallströmungstrocknern, mit einem glatten Trockenzylinder in Kontakt kommen. Damit ist ausgeschlossen, dass es beim Ablösen von einer glatten Mantelfläche zu einer Streckung der Faserstoffbahn kommt.Conveniently, the fibrous web should not have any contact with a smooth press roll in the press section and come into contact with a smooth drying cylinder only in the dryer section after reaching a relatively high moisture content and thus a sufficient strength, ie after the or the impingement flow dryers. This excludes the possibility of stretching the fibrous web when it comes off a smooth lateral surface.

Bei einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Trockenpartie ist der Bereich, in dem die zweite Saugwalze der Transferstrecke außer von dem Transferfilz und der Faserstoffbahn auch von dem um die erste insbesondere größere Stützwalze mit zugeordnetem Prallströmungstrockner geführten Sieb umschlungen ist, variabel einstellbar. Dabei ist der betreffende Umschlingungsbereich vorzugsweise über eine innerhalb der Schlaufe des Stützwalzensiebes angeordnete verstellbare Walze variabel einstellbar.In a preferred practical embodiment of the drying section according to the invention, the region in which the second suction roll of the transfer line is surrounded except by the transfer felt and the fibrous web also by the guided around the first particular larger support roll with associated impingement dryer screen is variably adjustable. In this case, the wrap-around region in question is preferably variably adjustable via an adjustable roller arranged within the loop of the support roller screen.

Eine jeweilige Stützwalze mit zugeordnetem Prallströmungstrockner ist mit Vakuum beaufschlagbar.A respective support roller with associated impingement dryer can be acted upon by vacuum.

Ein jeweiliger Prallströmungstrockner kann zumindest eine Heißluft- und/oder Heißdampfhaube umfassen. Bevorzugt ist jeder größeren Stützwalze nur eine Haube zugeordnet.A respective impingement flow dryer may comprise at least one hot air and / or superheated steam hood. Preferably, each larger support roller is associated with only one hood.

Bevorzugt sind der bzw. die insbesondere größeren Stützwalzen mit jeweils zugeordnetem Prallströmungstrockner in Bahnlaufrichtung betrachtet direkt nach der Pressenpartie und vor einer Zylinder-Trockenpartie angeordnet.Preferably, the or the particular larger back-up rolls, each with an associated impingement flow dryer, are arranged in the web running direction directly after the press section and before a cylinder drying section.

Vorteilhafterweise ist wenigstens ein Prallströmungstrockner vorgesehen, der bei einer Temperatur von etwa 300 bis etwa 550°C und/oder mit einer Ausblasgeschwindigkeit von etwa 70 bis etwa 130 m/s betreibbar.Advantageously, at least one impingement flow dryer is provided which is operable at a temperature of about 300 to about 550 ° C and / or at a blow-off speed of about 70 to about 130 m / s.

Die Haube eines jeweiligen Prallströmungstrockners kann beispielsweise mit einem Lochblech und/oder Schlitzen als Düsen für die Heißluft bzw. -dampf vorgesehen sein. Dabei liegt der Durchmesser der Lochdüsen vorteilhafterweise in einem Bereich von etwa 4 bis etwa 12 mm und vorzugsweise in einem Bereich von etwa 6 bis etwa 9 mm. Der Anteil der Düsen an der Gesamtfläche beträgt vorteilhafterweise etwa 2 bis etwa 4 %.The hood of a respective impingement flow dryer can be provided, for example, with a perforated plate and / or slots as nozzles for the hot air or steam. The diameter of the hole nozzles is advantageously in a range of about 4 to about 12 mm and preferably in one Range from about 6 to about 9 mm. The proportion of the nozzles in the total area is advantageously about 2 to about 4%.

Die Haube eines jeweiligen Prallströmungstrockners weist vorzugsweise mehrere Rückluftöffnungen auf, über die die Heißluft zusammen mit dem Wasserdampf der Trocknung absaugbar ist. Dabei sind diese Rückluftöffnungen vorzugsweise mit einem Lochblech oder Gitter abgedeckt, wodurch insbesondere verhindert wird, dass Fetzen in diese Öffnungen eintreten.The hood of a respective impingement flow dryer preferably has a plurality of return air openings, via which the hot air can be sucked out together with the steam of the drying. In this case, these return air openings are preferably covered with a perforated plate or grid, which in particular prevents shreds from entering these openings.

Von Vorteil ist insbesondere auch, wenn eine jeweilige Haube die betreffende Stützwalze entsprechend einem Winkel von zumindest 80° und höchstens 180° umschlingt, wobei dieser Umschlingungswinkel vorzugsweise in einem Bereich von etwa 90 bis etwa 130° liegt.It is also particularly advantageous if a respective hood wraps around the respective support roller in accordance with an angle of at least 80 ° and at most 180 °, wherein this wrap angle is preferably in a range of about 90 to about 130 °.

Die Haube eines jeweiligen Prallströmungstrockners besteht bevorzugt aus mehreren Modulen mit jeweils getrenntem Heißluft- bzw. Heißdampfkreislauf über der Breite der Faserstoffbahn, wobei die Breite eines jeweiligen Moduls vorzugsweise in einem Bereich von etwa 2 bis etwa 4 m liegt.The hood of a respective impingement flow dryer preferably consists of a plurality of modules, each with a separate hot air or hot steam cycle over the width of the fibrous web, wherein the width of each module is preferably in a range of about 2 to about 4 m.

Bei einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Trockenpartie sind zwei Prallströmungstrockner vorgesehen, die für eine Trockengehaltssteigerung von etwa 2 bis etwa 10 % ausgelegt sind, wobei die entsprechende Trockengehaltssteigerung bei Papieren mit einem Flächengewicht von mehr als 60 g/m2 in einem Bereich von etwa 2 bis etwa 5 % und bei Papieren mit einem Flächengewicht geringer als 60 g/m2 in einem Bereich von etwa 4 bis etwa 10 % liegt.In a preferred practical embodiment of the dryer section according to the invention, two impingement flow dryers are provided which are designed for a dry content increase of about 2 to about 10%, the corresponding dry content increase for papers having a basis weight of more than 60 g / m 2 in a range of about 2 to about 5% and for papers having a basis weight less than 60 g / m 2 in a range of about 4 to about 10%.

Vorteilhafterweise ist die Haube eines jeweiligen Prallströmungstrockners beweglich gelagert und beispielsweise zum Überführen, zur Reinigung und Wartung oder zum Siebwechsel von der betreffenden Stützwalze abhebbar.Advantageously, the hood of a respective impingement flow dryer is movably mounted and can be lifted, for example, for transfer, for cleaning and maintenance or for changing the screen of the respective support roller.

Eine jeweilige Stützwalze weist ein spezielles Bohrmuster mit Streifen auf, die eine größere offene Fläche besitzen als die restlichen Bereiche. Dabei können die Streifen insbesondere im Bereich der seitlichen Bahnränder vorgesehen sein. Alternativ oder zusätzlich können auch im mittleren Bahnbereich mehrere Streifen über der Breite vorgesehen sein.A respective back-up roll has a particular pattern of dripping with stripes having a larger open area than the remaining areas. In this case, the strips can be provided in particular in the region of the lateral web edges. Alternatively or additionally, a plurality of strips across the width may also be provided in the central region of the web.

Eine jeweilige Stützwalze wird vorzugsweise nicht über das betreffende Lager, sondern durch einen außenliegenden Kasten über die Mantelfläche besaugt.A respective support roller is preferably not sucked over the relevant bearing, but by an outer box over the lateral surface.

Bevorzugt besitzt eine jeweilige Stützwalze einen Durchmesser von zumindest etwa 3 m.Preferably, a respective backup roll has a diameter of at least about 3 m.

Wie sich bereits aus dem vorstehenden ergibt, kann ein jeweiliger Transfersaugkasten zwischen den beiden Saugwalzen nach der Pressenpartie insbesondere eine Vakuumerzeugung durch Absaugen oder über einen Foileffekt umfassen.As can already be seen from the above, a respective transfer suction box between the two suction rolls after the press section can in particular comprise vacuum generation by suction or by means of a foil effect.

Vorteilhafterweise ist das Vakuum eines jeweiligen Foil- und/oder Vakuumkastens steuer- und/oder regelbar, so dass zum Überführen ein ausreichendes Vakuum erzeugt bzw. eine hohe Luftmenge abgesaugt werden kann, im Betrieb bei Abdeckung durch die Faserstoffbahn jedoch kein zu hohes Vakuum mit einer starken Siebauslenkung auftritt, d.h. es wird im Betrieb nur noch eine kleinere Luftmenge abgesaugt.Advantageously, the vacuum of a respective Foil- and / or vacuum box can be controlled and / or regulated, so that for transferring a sufficient vacuum generated or a high amount of air can be sucked, in operation when covered by the fibrous web but not too high vacuum with a strong Siebauslenkung occurs, ie it is sucked in operation only a smaller amount of air.

Ein jeweiliger Foil- und/oder Vakuumkasten ist zweckmäßigerweise in seiner Position verstellbar, um beispielsweise eine Siebauslenkung, nachdem die Faserstoffbahn vollständig überführt ist, auszugleichen.A respective foil and / or vacuum box is expediently adjustable in its position in order, for example, to compensate for a sieve deflection after the fibrous web has been completely transferred.

Ein jeweiliger Foil- und/oder Vakuumkasten ist vorteilhafterweise so ausgeführt, dass ein kurzzeitiger Kontakt zwischen Sieb und Kasten nach dem Überführen und vor dem Zeitpunkt, zu dem das Vakuum auf den Betriebswert heruntergeregelt ist, zu keiner Beschädigung des Siebes oder Kastens und auch nicht zum Zusammenbruch des Vakuums führen kann. Dazu ist ein jeweiliger Foil- und/oder Vakuumkasten auf der dem Sieb zugewandten Seite bevorzugt mit abgerundeten Kontaktflächen, Teflonleisten und/oder als Abstandshalter dienenden Flächen versehen.A respective Foil- and / or vacuum box is advantageously designed so that a short-term contact between the sieve and box after the transfer and before the time when the vacuum is adjusted down to the operating value, no damage to the screen or box and also not to Collapse of the vacuum can result. For this purpose, a respective foil and / or vacuum box on the side facing the screen is preferably provided with rounded contact surfaces, Teflon strips and / or surfaces serving as spacers.

Ein jeweiliger Foil- und/oder Vakuumkasten ist zweckmäßigerweise mit einer seitlichen Abdichtung gegen das Transfersieb versehen. Dabei kann diese seitliche Abdichtung beispielsweise ein Luftmesser und/oder ein vorzugsweise aus Teflon bestehendes Seitenschild umfassen.A respective foil and / or vacuum box is expediently provided with a lateral seal against the transfer screen. In this case, this lateral seal may comprise, for example, an air knife and / or a side plate preferably made of Teflon.

Am Einlauf bzw. Auslauf kann ein jeweiliger Foil- und/oder Vakuumkasten beispielsweise durch ein Teflonschild und/oder eine Schaberklinge gegen die benachbarte Saugwalze abgedichtet sein.At the inlet or outlet, a respective foil and / or vacuum box can be sealed, for example, by a Teflon plate and / or a scraper blade against the adjacent suction roll.

Bevorzugt wird ein jeweiliger Foil- und/oder Vakuumkasten im Betrieb mit einem Vakuum im Bereich von etwa 50 bis 1000 Pa und vorzugsweise im Bereich von etwa 100 bis etwa 600 Pa betrieben.Preferably, a respective foil and / or vacuum box is operated in operation with a vacuum in the range of about 50 to 1000 Pa, and preferably in the range of about 100 to about 600 Pa.

Die Transferstrecke zwischen den beiden Saugwalzen ist zweckmäßigerweise kürzer als etwa 4 m und vorzugsweise kürzer als etwa 3 m.The transfer distance between the two suction rolls is expediently shorter than about 4 m and preferably shorter than about 3 m.

Die Transferstrecke kann waagerecht oder zur Waagerechten leicht geneigt verlaufen.The transfer section can be horizontal or slightly inclined to the horizontal.

Die erfindungsgemäße, eine Pressenpartie sowie eine Trockenpartie umfassende Maschine zur Herstellung einer Faserstoffbahn, insbesondere Papier-, Karton- oder Tissuebahn zeichnet sich dadurch aus, dass sie mit einer erfindungsgemäßen Trockenpartie versehen ist.The inventive, a press section and a dryer section comprehensive machine for producing a fibrous web, in particular paper, board or tissue web is characterized in that it is provided with a dryer section according to the invention.

Die Pressenpartie umfasst vorzugsweise zumindest eine Schuhpresse.The press section preferably comprises at least one shoe press.

Die Pressenpartie ist bevorzugt so ausgelegt, dass die Faserstoffbahn in dieser Pressenpartie mit keiner glatten Walze in Kontakt kommt.The press section is preferably designed so that the fibrous web does not come into contact with any smooth roller in this press section.

Bei einer bevorzugten Ausführungsform der erfindungsgemäßen Maschine besteht die Pressenpartie nur aus einer oder mehreren Schuhpressen.In a preferred embodiment of the machine according to the invention, the press section consists only of one or more shoe presses.

Die Pressenpartie kann eine gekippt angeordnete Tandem- oder Single-Schuhpresse umfassen.The press section may comprise a tilted tandem or single shoe press.

Von Vorteil ist insbesondere auch, wenn die Pressenpartie eine Pressenanordnung mit einem Walzen- und einem Schuhpressnip umfasst.It is also particularly advantageous if the press section comprises a press arrangement with a roll press nip and a press nip.

Bei einer zweckmäßigen praktischen Ausführungsform der erfindungsgemä-Ben Maschine umfasst die Pressenpartie eine Pressenanordnung mit wenigstens einer Saugpresswalze.In an expedient practical embodiment of the inventive ben-Ben machine, the press section comprises a press arrangement with at least one Saugpresswalze.

In der Pressenpartie kann wenigstens ein Transferband vorgesehen sein.At least one transfer belt may be provided in the press section.

Bevorzugt ist der Trockengehalt nach der Pressenpartie bei holzfreien oder Spezialpapieren zumindest 40 %, vorzugsweise zumindest 43 %, und bei holzhaltigen Papieren (wie z.B. Zeitungsdruck, SC, LWC,....) zumindest 46 %, vorzugsweise zumindest 49 %.Preferably, the dry content after the press section is at least 40%, preferably at least 43%, for wood-free or specialty papers, and at least 46%, preferably at least 49%, for wood-containing papers (such as newsprint, SC, LWC, etc.).

Die Maschinengeschwindigkeit kann für holzfreie Papiersorten insbesondere größer als etwa 800 m/min, vorzugsweise größer als etwa 1000 m/min, und für holzhaltige Papiere insbesondere größer als etwa 1200 m/min, vorzugsweise größer als 1500 m/min sein.The machine speed may be greater than about 800 m / min, preferably greater than about 1000 m / min for wood-free paper types, and in particular greater than about 1200 m / min, preferably greater than 1500 m / min for wood-containing papers.

Wie bereits erwähnt, soll die Faserstoffbahn in der Pressenpartie vorzugsweise keinen Kontakt mit einer glatten Presswalze haben und erst in der Trockenpartie nach Erreichen eines relativ hohen Feuchtegehalts und entsprechend einer ausreichenden Festigkeit, d.h. nach dem bzw. den Prallströmungstrocknern, mit einem glatten Trockenzylinder in Kontakt kommen. Es ist somit ausgeschlossen, dass es beim Ablösen von einer glatten Mantelfläche zu einer unerwünschten Streckung der Faserstoffbahn kommen kann.As already mentioned, the fibrous web in the press section should preferably not have any contact with a smooth press roll and only in the dryer section after reaching a relatively high moisture content and correspondingly sufficient strength, i. After the impingement flow dryers, come into contact with a smooth drying cylinder. It is thus ruled out that, when detaching from a smooth lateral surface, undesired stretching of the fibrous web can occur.

Die Erfindung wird im Folgenden anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher erläutert.The invention will be explained in more detail below with reference to an embodiment with reference to the drawing.

Die einzige Figur der Zeichnung zeigt in schematischer Teildarstellung eine Trockenpartie 10 einer Maschine zur Herstellung einer Faserstoffbahn, bei der es sich insbesondere um eine Papier-, Karton- oder Tissuebahn handeln kann.The sole figure of the drawing shows a schematic partial representation of a drying section 10 of a machine for producing a fibrous web, which may be in particular a paper, board or tissue web.

In dieser Trockenpartie 10 wird die Faserstoffbahn ausgehend vom letzten Pressnip 12 einer Pressenpartie 14 über eine beispielsweise gerade Transferstrecke 16, die auch leicht gekrümmt sein kann, zu einer ersten insbesondere größeren Stützwalze 18 mit zugeordnetem Prallströmungstrockner 20 geführt. Unter einer größeren Stützwalze ist hier z.B. eine Stützwalze zu verstehen, deren Durchmesser größer ist als der Durchmesser eines herkömmlichen Trockenzylinders. Bevorzugt besitzt eine solche größere Stützwalze eine Durchmesser von zumindest 3 m.In this dryer section 10, the fibrous web, starting from the last press nip 12 of a press section 14 via an example straight transfer section 16, which may also be slightly curved, led to a first particular larger support roller 18 with associated impingement dryer 20. By a larger back-up roll is meant, for example, a back-up roll whose diameter is greater than the diameter of a conventional drying cylinder. Preferably, such a larger support roller has a diameter of at least 3 m.

Die Stützwalze 18 ist von einem Sieb 22 umschlungen. Die um die siebumschlungene Stützwalze 18 geführte Faserstoffbahn wird durch den Prallströmungstrockner 20 mit einer Heißluft- und/oder Heißdampfprallströmung beaufschlagt.The support roller 18 is looped by a sieve 22. The fibrous web guided around the sieve wrap around the sieve 17 is subjected to a hot air and / or superheated steam flow by the impingement flow dryer 20.

Bei der ersten Stützwalze 18 handelt es sich um eine obere Stützwalze, d.h. die Faserstoffbahn wird dieser Walze von unten nach oben zugeführt und von oben nach unten von dieser Walze wieder entfernt. Der Prallströmungstrockner 20 ist z.B. im oberen Bereich dieser ersten Stützwalze 18 angeordnet.The first back-up roll 18 is an upper back-up roll, i. the fibrous web is supplied to this roller from bottom to top and removed from top to bottom of this roller again. The impingement dryer 20 is e.g. arranged in the upper region of this first support roller 18.

Die Transferstrecke 16 ist durch ein um zwei Saugwalzen 24, 26 geführtes Sieb 28 gebildet, dem zum Halten der Faserstoffbahn am Sieb 28 ein oder mehrere Foil- und/oder Vakuumkästen 30 zugeordnet sind.The transfer section 16 is formed by a screen 28 guided around two suction rollers 24, 26, to which one or more foil and / or vacuum boxes 30 are assigned to hold the fibrous web on the wire 28.

Die erste Saugwalze 24 nimmt die Faserstoffbahn von einem aus dem Pressnip 12 auslaufenden Pressband oder -filz ab, während die zweite Saugwalze 26 die Faserstoffbahn nur bei der Umlenkung um diese Walze hält. Im Bereich der ersten Saugwalze 24 kann die Faserstoffbahn beispielsweise auch von einem Transferband abgenommen werden.The first suction roll 24 removes the fibrous web from a press belt or felt running out of the press nip 12, while the second suction roll 26 holds the fibrous web only during the deflection around this roll. In the area of the first suction roll 24, the fibrous web can also be removed, for example, from a transfer belt.

Im vorliegenden Fall ist eine zweite insbesondere größere Stützwalze 34 mit zugeordnetem Prallströmungstrockner 36 vorgesehen. Dabei wird die Faserstoffbahn ohne Abnahmesaugwalze direkt vom die erste Stützwalze 18 umschlingenden Sieb 22 auf das die zweite Stützwalze 34 umschlingende Sieb 38 bzw. direkt auf die siebumschlungene zweite Stützwalze 34 übergeben. Im vorliegenden Fall erfolgt die Übergabe unmittelbar vor der zweiten Stützwalze 34.In the present case, a second, in particular larger support roller 34 is provided with associated impingement dryer 36. In this case, the fibrous web without Abnahmesaugwalze directly from the first support roller 18 wraps around the screen 22 on the second support roller 34 looping around 38th or transferred directly to the sieve wrap around second support roller 34. In the present case, the transfer takes place immediately before the second support roller 34.

Wie anhand der Figur zu erkennen ist, ist der Bereich, in dem die zweite Saugwalze 26 der Transferstrecke 16 außer von dem Transferfilz 28 und der Faserstoffbahn auch von dem um die erste insbesondere größere Stützwalze 18 geführten Sieb 22 umschlungen ist, variabel einstellbar. Es ergibt sich also eine variable "Sandwich"-Umschlingung. Dabei kann der betreffende Umschlingungsbereich über eine innerhalb der Schlaufe des Stützwalzensiebes 22 angeordnete verstellbare Walze 40 variabel einstellbar sein.As can be seen from the figure, the area in which the second suction roll 26 of the transfer line 16 is surrounded except by the transfer felt 28 and the fibrous web and by the guided around the first particular larger support roller 18 sieve 22, variably adjustable. This results in a variable "sandwich" wrap. In this case, the wrapping region in question can be variably adjustable via an adjustable roller 40 arranged within the loop of the supporting roller screen 22.

Die beiden Stützwalzen 18, 34 sind ebenso wie die beiden Kästen 30 jeweils mit Vakuum beaufschlagbar.The two support rollers 18, 34 are as well as the two boxes 30 each acted upon by vacuum.

Bei der zweiten Stützwalze 34 handelt es sich um eine untere Walze, d.h. die Faserstoffbahn wird dieser Walze von oben nach unten zugeführt und von unten nach oben von dieser Walze entfernt. Der Prallströmungstrockner 36 ist hier im Bereich des unteren rechten Quadranten der Stützwalze 34 angeordnet.The second back-up roll 34 is a lower roll, i. the fibrous web is supplied to this roll from top to bottom and removed from bottom to top of this roll. The impingement dryer 36 is arranged here in the region of the lower right quadrant of the support roller 34.

Die beiden Stützwalzen 18, 34 mit jeweils zugeordnetem Prallströmungstrockner 20, 36 können in Bahnlaufrichtung betrachtet also direkt nach der Pressenpartie 14 und vor einer Zylinder-Trockenpartie 42 angeordnet sein.The two support rollers 18, 34, each with associated impingement dryer 20, 36 can therefore be arranged in the web running direction directly after the press section 14 and before a cylinder drying section 42.

Die beiden Prallströmungstrockner 20, 36 können jeweils eine Heißluft- und/oder Heißdampfhaube 44, 46 umfassen.The two impingement-type dryers 20, 36 may each comprise a hot-air and / or superheated steam hood 44, 46.

Im vorliegenden Fall verläuft die Transferstrecke 16 waagerecht. Grundsätzlich kann sie jedoch auch zur Waagerechten leicht geneigt verlaufen.In the present case, the transfer line 16 is horizontal. In principle, however, it can also be slightly inclined to the horizontal.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Trockenpartiedrying section
1212
Pressnippress nip
1414
Pressenpartiepress section
1616
Transferstrecketransfer route
1818
erste Stützwalzefirst back-up roll
2020
PrallströmungstrocknerImpingement dryer
2222
Siebscree
2424
Saugwalzesuction roll
2626
Saugwalzesuction roll
2828
Siebscree
3030
Foil- oder VakuumkastenFoil or vacuum box
3232
Pressband oder -filzPress belt or felt
3434
zweite Stützwalzesecond support roller
3636
PrallströmungstrocknerImpingement dryer
3838
Siebscree
4040
verstellbare Walzeadjustable roller
4242
Zylinder-TrockenpartieCylinder drying section
4444
HaubeHood
4646
HaubeHood

Claims (42)

  1. Drying section (10) for a machine for producing a fibrous web, in particular a paper, board or tissue web, in which the fibrous web, starting from the last press nip (12) of a press section (14), is led over a straight or slightly curved transfer section (16) to at least one in particular relatively large supporting roll (18, 34) with associated impingement flow dryer (20), by means of which the fibrous web led around the supporting roll (18, 34) can be have a hot-air and/or hot-steam impingement flow applied to it, it being possible for a vacuum to be applied to a respective supporting roll (18, 34), the transfer section (16) being formed by a fabric (28) led around two suction rolls (24, 26), the first suction roll (24) picking up the fibrous web from a press belt or felt (32) running out of the press nip (12) or from a transfer belt, and the second suction roll (26) holding the fibrous web only as the latter is deflected around this roll,
    characterized in that
    the respective supporting roll (18, 34) has a specific drilling pattern with stripes which have a larger open area then the remaining regions.
  2. Drying section according to Claim 1,
    characterized in that
    the fabric (28) of the transfer section (16) is assigned one or more foil and/or vacuum boxes (30) to hold the fibrous web on the fabric (28).
  3. Drying section according to Claim 1 or 2,
    characterized in that
    the fibrous web is led around at least two in particular relatively large supporting rolls (18, 34) with respectively associated impingement flow dryers (20, 36), and the fibrous web is transferred directly without any pick-up suction roll from the fabric (22) wrapping around the first supporting roll (18) to the fabric (38) wrapping around the second supporting roll (34) or the second supporting roll (34) around which the fabric wraps.
  4. Drying section according to one of the preceding claims,
    characterized in that
    the region in which, apart from the fabric (28) and the fibrous web, the fabric (22) led around the first in particular relatively large supporting roll (18) with associated impingement flow dryer (20) wraps around the second suction roll (26) of the transfer section (16) can be adjusted variably.
  5. Drying section according to Claim 4,
    characterized in that
    the relevant wrap region can be adjusted variably via an adjustable roll (40) that is arranged within the loop of the supporting roll fabric (22).
  6. Drying section according to one of the preceding claims,
    characterized in that
    a respective in particular relatively large supporting roll (18, 34) with associated impingement flow dryer (20, 36) can have vacuum applied to it.
  7. Drying section according to one of the preceding claims,
    characterized in that
    a respective impingement flow dryer (20, 36) comprises a hot-air and/or hot-steam hood (44, 46).
  8. Drying section according to one of the preceding claims,
    characterized in that
    each relatively large supporting roll (18, 34) is assigned only one hot-air and/or hot-steam hood.
  9. Drying section according to one of the preceding claims,
    characterized in that
    the in particular relatively large supporting roll or rolls (18, 34) with respectively associated impingement flow dryer (20, 36), as viewed in the web running direction, are arranged directly after the press section (14) and before a cylinder drying section (42).
  10. Drying section according to one of the preceding claims,
    characterized in that
    at least one impingement flow dryer (20, 36) is provided, which can be operated at a temperature of about 300 to about 550°C and/or with an output blowing velocity of about 70 to about 130 m/s.
  11. Drying section according to one of the preceding claims,
    characterized in that
    the hood (44, 46) of a respective impingement flow dryer (20, 36) is provided with a perforated plate and/or slots as nozzles for the hot air or steam.
  12. Drying section according to Claim 11,
    characterized in that
    the diameter of the hole-type nozzles lies in a range from about 4 to about 12 mm and preferably in a range from about 6 to about 9 mm.
  13. Drying section according to Claim 11 or 12,
    characterized in that
    the proportion of the nozzles in the total area is about 2 to about 4%.
  14. Drying section according to one of the preceding claims,
    characterized in that
    the hood (44, 46) of a respective impingement flow dryer has a plurality of return air openings, into which the hot air can be sucked together with the water vapour from the drying, these return air openings preferably being covered with a perforated plate or grille.
  15. Drying section according to one of the preceding claims,
    characterized in that
    a respective hood (44, 46) wraps around the relevant supporting roll in a way corresponding to an angle of at least 80° and at most 180°, this wrap angle preferably lying in a range from about 90 to about 130°.
  16. Drying section according to one of the preceding claims,
    characterized in that
    the hood (44, 46) of a respective impingement flow dryer (20, 36) comprises a plurality of modules with a respectively separate hot-air or hot-steam circuit over the width of the fibrous web, the width of a respective module preferably lying in a range from about 2 to about 4 m.
  17. Drying section according to one of the preceding claims,
    characterized in that
    two impingement flow dryers (20, 36) are provided, which are designed for an increase in dryness from about 2 to about 10%, the corresponding increase in dryness in the case of papers with a grammage of more than 60 g/m2 lying in a range from about 2 to about 5% and, in the case of papers with a grammage of less than 60 g/m2, lying in a range from about 4 to about 10%.
  18. Drying section according to one of the preceding claims,
    characterized in that
    the hood (44, 46) of a respective impingement flow dryer (20, 36) is mounted such that it can be moved and can be raised off the relevant supporting roll (18, 34).
  19. Drying section according to one of the preceding claims,
    characterized in that
    the stripes are arranged in the region of the web side edges.
  20. Drying section according to one of the preceding claims,
    characterized in that
    in the central web region, a plurality of stripes is provided over the width.
  21. Drying section according to one of the preceding claims,
    characterized in that
    a respective supporting roll (18, 34) can be evacuated not via the relevant bearing but through an externally located box over the circumferential surface.
  22. Drying section according to one of the preceding claims,
    characterized in that
    a respective supporting roll (18, 34) has a diameter of at least about 3 m.
  23. Drying section according to one of Claims 2 to 22,
    characterized in that
    the vacuum of a respective foil and/or vacuum box (30) can be controlled and/or regulated.
  24. Drying section according to one of Claims 2 to 23,
    characterized in that
    the position of a respective foil and/or vacuum box (30) can be adjusted.
  25. Drying section according to one of Claims 2 to 24,
    characterized in that
    a respective foil and/or vacuum box (30) is provided with rounded contact surfaces, Teflon strips and/or surfaces serving as spacers.
  26. Drying section according to one of Claims 2 to 25,
    characterized in that
    a respective foil and/or vacuum box (30) is provided with a lateral seal with respect to the transfer fabric (28).
  27. Drying section according to Claim 26,
    characterized in that
    the lateral seal comprises an air knife and/or a side shield preferably consisting of Teflon.
  28. Drying section according to one of Claims 2 to 27,
    characterized in that
    a respective foil and/or vacuum box (30) is sealed off at the inlet and outlet with respect to the adjacent suction roll (24, 26).
  29. Drying section according to Claim 28,
    characterized in that
    the relevant seal comprises a Teflon shield and/or a doctor blade.
  30. Drying section according to one of Claims 2 to 29,
    characterized in that
    during operation, a respective foil and/or vacuum box (30) can be operated with a vacuum in the range from about 50 to about 1000 Pa and preferably in the range from about 100 to about 600 Pa.
  31. Drying section according to one of the preceding claims,
    characterized in that
    the transfer section (16) between the two suction rolls (24, 26) is shorter than about 4 m and preferably shorter than about 3 m.
  32. Drying section according to one of the preceding claims,
    characterized in that
    the transfer section (16) runs horizontally or at a slight angle to the horizontal.
  33. Machine for producing a fibrous web, in particular a paper, board or tissue web, having a press section (14) and a drying section (10) according to one of the preceding claims.
  34. Machine according to Claim 33,
    characterized in that
    the press section (14) comprises at least one shoe press.
  35. Machine according to Claim 34,
    characterized in that
    the fibrous web does not come into contact with any smooth roll in the press section (14).
  36. Machine according to Claim 34 or 35,
    characterized in that
    the press section (14) comprises only one or more shoe presses.
  37. Machine according to one of Claims 33 to 36,
    characterized in that
    the press section (14) comprises a canted tandem or single shoe press.
  38. Machine according to one of Claims 33 to 37,
    characterized in that
    the press section (14) comprises a press arrangement having a roll nip and a shoe press nip.
  39. Machine according to one of Claims 33 to 38,
    characterized in that
    the press section (14) comprises a press arrangement having at least one suction press roll.
  40. Machine according to one of Claims 33 to 39,
    characterized in that
    at least one transfer belt is provided in the press section (14).
  41. Machine according to one of Claims 33 to 40,
    characterized in that
    the dryness after the press section (14) in the case of wood-free or special papers is at least 40%, preferably at least 43%, and in the case of papers containing groundwood is at least 46%, preferably at least 49%.
  42. Method for operating a machine according to one of Claims 33 to 41,
    characterized in that
    the machine speed for wood-free paper grades is chosen to be greater than about 800 m/min, preferably greater than about 1000 m/min, and for papers containing groundwood is chosen to be greater than about 1200 m/min, preferably greater than 1500 m/min.
EP05773999A 2004-11-12 2005-08-03 Drier section Not-in-force EP1819872B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004054886A DE102004054886A1 (en) 2004-11-12 2004-11-12 drying section
PCT/EP2005/053783 WO2006051005A1 (en) 2004-11-12 2005-08-03 Drier section

Publications (2)

Publication Number Publication Date
EP1819872A1 EP1819872A1 (en) 2007-08-22
EP1819872B1 true EP1819872B1 (en) 2011-04-20

Family

ID=35094655

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05773999A Not-in-force EP1819872B1 (en) 2004-11-12 2005-08-03 Drier section

Country Status (5)

Country Link
EP (1) EP1819872B1 (en)
CN (1) CN101057030A (en)
AT (1) ATE506485T1 (en)
DE (2) DE102004054886A1 (en)
WO (1) WO2006051005A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008042282A1 (en) 2008-09-23 2010-03-25 Voith Patent Gmbh Machine for producing e.g. paper web, has suction roller arranged in conveying tension belt downstream to delivery region and movable from operating position into another operating position under opening of delivery region
CN109442943B (en) * 2018-10-22 2020-07-03 江苏盛斯达纺织科技有限公司 Textile drying equipment in shed
CN110595179B (en) * 2019-10-11 2020-12-18 高密市家诚机械科技有限公司 Heating method of rotary drying drum of textile equipment and drying equipment

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5678321A (en) * 1995-09-12 1997-10-21 Beloit Technologies, Inc. Air caps for two tier double felted dryer
FI104000B1 (en) * 1998-04-03 1999-10-29 Valmet Corp Inflow system fitted around a roll, cylinder or the like in the drying section of a papermaking machine or the like
EP1125020B1 (en) 1998-08-04 2004-11-17 Metso Paper, Inc. Method and arrangement for handling paper or cardboard webs
DE19841768A1 (en) 1998-09-11 2000-03-16 Voith Sulzer Papiertech Patent Dryer section
DE19935138A1 (en) 1998-09-11 2000-05-04 Voith Sulzer Papiertech Patent Fiber web drying section with a deflection flow dryer, with good drying rate, shortest web drying path and trouble-free web movement through the drying stage
FI20002628A0 (en) * 2000-11-30 2000-11-30 Valmet Corp Method and apparatus in a paper or board machine
FI111092B (en) * 2001-06-26 2003-05-30 Metso Automation Oy A method for blowing drying gas against a paper web and a paper machine blow dryer

Also Published As

Publication number Publication date
DE502005011290D1 (en) 2011-06-01
WO2006051005A1 (en) 2006-05-18
CN101057030A (en) 2007-10-17
DE102004054886A1 (en) 2006-05-18
EP1819872A1 (en) 2007-08-22
ATE506485T1 (en) 2011-05-15

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