EP2003243B1 - Dryer section - Google Patents

Dryer section Download PDF

Info

Publication number
EP2003243B1
EP2003243B1 EP08157399A EP08157399A EP2003243B1 EP 2003243 B1 EP2003243 B1 EP 2003243B1 EP 08157399 A EP08157399 A EP 08157399A EP 08157399 A EP08157399 A EP 08157399A EP 2003243 B1 EP2003243 B1 EP 2003243B1
Authority
EP
European Patent Office
Prior art keywords
dryer
section
drying
fibrous web
web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08157399A
Other languages
German (de)
French (fr)
Other versions
EP2003243A1 (en
Inventor
Dominik Mai
Peter Kahl
Werner Göbel
Roland Mayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2003243A1 publication Critical patent/EP2003243A1/en
Application granted granted Critical
Publication of EP2003243B1 publication Critical patent/EP2003243B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—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
    • 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

Definitions

  • the invention relates to a dryer section for a machine for producing and / or treating a fibrous web, in particular paper, board or tissue web, comprising an impingement drying section comprising one or more drying belts in which the fibrous web is supported on a respective drying belt with hot air and / or or steam can be acted upon, one in the web running direction of the impingement drying section subsequent transfer section, and in the web direction to the transfer section subsequent first dryer group with associated dryer fabric in which the fibrous web together with the dryer fabric around at least one drying cylinder and at least one guide roll with associated Stabilizer, preferably high-vacuum stabilizer, is performed, wherein the fibrous web is transferred via the transfer section from the impingement drying section to the first drying group. It further relates to a machine for producing and / or treating a fibrous web, in particular paper, board or tissue web.
  • the impingement drying section may comprise one or more impingement units in which the fibrous web is guided, in each case supported on a drying belt, in each case, for example, over a larger or a plurality of smaller support rollers.
  • the stabilizer associated with a respective guide roll of the first dryer group serves, in particular, to assist the removal of the fibrous web from a respective drying cylinder and the web during the transfer from the relevant drying cylinder to the guide roll and / or during the transfer to keep the fibrous web from the guide roll to a respective further drying cylinder on the respective drying wire.
  • the impingement drying section serves primarily to increase thefuggehalts- and thus an increase in strength of the fibrous web after the press section, whereby higher machine speeds are possible. Since the stabilizers assigned to the guide rolls or drying cylinders in the dryer groups, which preferably comprise a high-vacuum release zone, assist the decrease in the fibrous web from the respective smooth drying cylinder, higher machine speeds are also possible in this respect.
  • a paper machine is already known in which the fibrous web is guided together with a press felt through the last press nip of the press section and the fibrous web is taken over by means of the dryer wire of the first dryer group of the press felt.
  • the fibrous web is thus constantly supported by at least one belt or roller between the press section and the first dryer section.
  • the first dryer group has only a single drying cylinder.
  • the transfer strip of the fibrous web is transferred through the dryer section, then the positive effect of the stabilizer is missing accordingly.
  • the web tension must be compensated by an increased differential speed or an increased tension between the press section and the dryer section. Only after successful transfer and widening can the high-vacuum stabilizer be fully switched on again and the web tension reduced.
  • the invention has for its object to provide an improved dryer section and an improved machine of the type mentioned, with which the aforementioned disadvantages are eliminated.
  • the transfer section comprises a first rotating transfer element formed in particular by a cylinder or a roller and a transfer suction roll spaced therefrom and wrapped by the dryer wire of the first dryer group, wherein the fibrous web together with the last, preferably dry sieve the impingement drying section is fed to the first rotating transfer element, the last drying belt is led away from the fibrous web and the first rotating transfer element from the first rotating transfer element before the end of the fibrous web, and the fibrous web is moved freely from the first rotating transfer element to the dryer fabric first transfer group wrapped transfer suction roll is passed.
  • the full speed potential of both the impingement drying and the stabilizer, in particular high-vacuum stabilizer can always be used.
  • a higher production speed is possible because the impingement drying increases the strength of the wet fibrous web.
  • the adhesion of the fibrous web to the following on the impingement drying section, formed in particular by a cylinder or a roller first rotating element is significantly reduced, as this now to a lesser extent than before of the relevant, for example sieve-like drying belt of the impingement drying section is entwined.
  • the fibrous web therefore dissolves much more easily from the first rotating transfer element, so that a higher web tension or stabilizers or high-vacuum stabilizers are required only in the area of the drying cylinder or guide rolls of the drying group or drying groups following the first rotating transfer element.
  • Am by a cylinder or a roller formed first rotating transfer element, such a stabilizer is no longer necessary.
  • the fibrous web runs on the first rotating transfer element in the pulper. The danger of a disturbing self-transfer is eliminated.
  • the respective stabilizer or high-vacuum stabilizer on the first drying cylinder or an adjacent guide roller can remain fully operational. A Switzerlanderhöhung is therefore not required. This results in an optimal combination of the use of an impingement drying section with the use of at least one stabilizer, in particular high-vacuum stabilizer, whereby very high production speeds are made possible.
  • the impingement drying section may comprise only one or more drying belts, wherein in the first case the last drying belt is correspondingly formed by the single drying belt.
  • At least the first drying cylinder in the direction of web travel and / or the first guide roller of the first drying group is assigned a stabilizer or high-vacuum stabilizer.
  • a stabilizer serves primarily to assist the web removal from the respective drying cylinder.
  • a Duostabilisator be provided by the addition of the fibrous web is held following the expiration of the guide roller on the dryer.
  • the transfer suction roll is adjustable to change the distance between the latter and the first rotating transfer element.
  • the transfer suction roll is preferably pivotable accordingly.
  • the transfer suction roll is adjustable between a transfer or tear-off position in which it has a relatively greater distance from the first rotating transfer element and an operating position in which it has a relatively smaller distance from the first rotating transfer element.
  • the distance between its surface and the surface of the first rotating transfer element is preferably at least 50 mm at its transfer or tear-off position engaging the transfer or tear-off position, wherein it is advantageously greater than 70 mm.
  • the distance between its surface and the surface of the first rotating transfer element is less than 30 mm and preferably less than 10 mm at its operating position of the transfer suction whale.
  • the first rotating transfer element is looped over an area smaller than 190 °, preferably smaller than 160 °, from the last drying belt of the impingement drying section. Because of this relatively low angle of wrap, the adhesion of the fibrous web to the first rotating transfer element is significantly reduced.
  • the first rotating transfer element can be formed for example by a particular steam-heated cylinder or, for example, by an unheated guide roll.
  • the first rotating transfer element is provided with an outer coating which supports the decrease of the fibrous web. This also reduces the adhesion of the web to the first rotating transfer element.
  • the outer coating may expediently consist at least partially of metal carbide Teflon and / or ceramic.
  • the first rotating transfer element is formed by a guide roll with a lateral surface of porous material. Air can thus be blown from the inside through the porous lateral surface, which in turn reduces the adhesion of the web to the guide roller.
  • the drying section may comprise one or more drying groups, each with at least one associated drying wire.
  • preference is given to predominantly single-row drying groups. It is particularly advantageous if at least 70% of the drying cylinders are arranged in a single row.
  • the first drying group can expediently have at least two drying cylinders, wherein it preferably has three drying cylinders.
  • the second drying group adjoining the first drying group in the web running direction has at least two and preferably three drying cylinders.
  • the fibrous web in the web running direction immediately before the impingement drying section has a dry content in a wood-free paper in a range from about 46% to about 58%.
  • the fibrous web has a solids content in the web running direction immediately before the impingement drying section in a range from about 48% to about 60%.
  • the fibrous web in the web running direction immediately after the impingement drying section expediently has a solids content of at least 49%.
  • it preferably has a solids content of at least 52% in wood-containing paper in the web running direction immediately after the impingement drying section.
  • the dryer section thus comprises an impingement drying section and an immediately following first cylinder or first roller, onto which or directly a free draw takes place.
  • the transfer section comprises a transfer suction roll, which is adjustable, preferably pivotable, between a greater distance to the first cylinder or roller when transferring the fibrous web and a smaller distance in normal operation after successful spreading.
  • the following dryer fabric of the first drying group does not touch or wrap around the first cylinder or roll following the impingement drying section.
  • the first cylinder or roller following the impingement drying section may be specially coated for better web removal, in particular having a metal carbide Teflon coating or a ceramic layer.
  • the machine according to the invention for producing and / or treating a fibrous web, in particular a paper, board or tissue web is characterized in that, in addition to a former and a press section, it comprises a dryer section according to the invention.
  • the impingement drying section adjoins the press section in the web running direction without intermediate vapor-heated cylinders.
  • the impingement drying section follows directly onto the press section without any vapor-heated cylinder interposed therebetween.
  • the fibrous web is continuously guided in a closed train through the press section.
  • the fibrous web is viewed in the web running direction, starting from the former for the first time after the first rotating transfer element guided in a free train.
  • the press section can for example comprise a tandem press or a DuoCentri press with center belt.
  • the machine is for a ropeless transfer of the fibrous web starting from the former, that is, the first pickup point, carried out to the beginning of the first drying group in a step with full web width.
  • the fibrous web can thus be guided with full web width in one step without ropes with full web width through the press section and the impingement drying section.
  • FIG. 1 shows a schematic partial representation of an exemplary embodiment of a machine 10 for the production and / or treatment of a fibrous web, which may be in particular a paper, board or tissue web.
  • the machine 10 comprises a former (not shown), a press section 12 and a dryer section 14.
  • the drying section comprises an impingement drying section 16, here comprising, for example, two drying belts 18, 44, in which the fibrous web is subjected to hot air and / or steam, supported on a respective drying belt 18 and 44, respectively.
  • this drying section 14 comprises a transfer section 20 adjoining the impingement drying section 16 in the web running direction L and a subsequent drying group 22 in the web running direction L to the transfer section 20 with associated dryer fabric 24, in which the fibrous web 46 together with the dryer fabric 24 and at least one drying cylinder 26 to 30 and at least one guide roll 32, 34 with associated stabilizer 36, 38, preferably high-vacuum stabilizer is performed.
  • the fibrous web is transferred via the transfer section 20 from the impingement drying section 16 to the first dryer section 22.
  • the transfer section 20 comprises a first rotating transfer element 40 formed by a cylinder or a roller and a transfer suction roll 42 spaced therefrom and wrapped by the drying wire 24 of the first drying group 22.
  • the fibrous web 46 is fed to the first rotating transfer element 40 together with the last drying belt 44 of the impingement drying section 16, which is preferably embodied here as a sieve.
  • the last drying belt 44 is separated from the fibrous web and the first rotating transfer element 42 before the end of the fibrous web 46 by the first rotating transfer element 42. Following this, the first rotating transfer element 40 can then be wrapped around the fibrous web 46 for a while. The fibrous web 46 is then transferred in a free pass from the first rotating transfer element 40 to the transfer suction roll 42, which is looped around by the drying wire 24 of the first drying group 22.
  • At least the first in the web running direction L drying cylinder 26 and / or the first guide roller 32 of the first dryer group 22 is a Stabilizer assigned 36, 38, which is preferably a high-vacuum stabilizer.
  • the first drying group 22 comprises, for example, three drying cylinders 26 to 30, which form an upper row, and two lower guide rollers 32, 34 which are between the first and the second drying cylinder 26, 28 and between the second and the third drying cylinder 28 , 30 are arranged.
  • the fibrous web 46 is guided together with the dryer wire 24 from the first drying cylinder 26 via the guide roller 32 to the second drying cylinder 28 and via the guide roller 34 to the third drying cylinder 30.
  • the two guide rollers 32, 34 are each assigned a preferably designed as a high-vacuum stabilizer stabilizer 36 and 38 respectively.
  • the first stabilizer 36 supports the web removal from the first drying cylinder 26, while the second stabilizer 38 supports the web removal from the second drying cylinder 38.
  • the stabilizers 32, 34 may in particular also be designed as Duostabilisatoren, by which the fibrous web 46 is additionally held after the expiration of the respective guide roller 32 and 34 on the drying wire 24.
  • the transfer suction roll 42 is adjustable to change the distance between it and the first rotating transfer element 40, preferably pivotable. In this case, it can in particular be adjustable or pivotable between a transfer or tear-off position in which it has a relatively greater distance from the first rotating transfer element 40 and an operating position in which it has a relatively smaller distance from the first rotating transfer element 40.
  • the first rotating transfer element 40 can in particular over a range smaller than 190 °, preferably smaller than 160 ° from the last drying belt 44 of the impingement drying section 16.
  • the first rotating transfer element 40 may, for example, be a steam-heated cylinder or, for example, also a non-heated guide roller.
  • first rotating transfer element 40 may be provided with an outer coating to assist in the removal of the fibrous web 46.
  • This outer coating may, for example, at least partially made of metal carbide Teflon and / or ceramic.
  • the drying section 14 may comprise one or more drying groups.
  • the impingement drying section 16 joins in the web running direction L without intermediate steam-heated cylinder to the press section 12 at.
  • the fibrous web 46 is preferably guided continuously through the press section 12 in a closed train.
  • the press section 12 may comprise, for example, a tandem press or a DuoCentri press with center belt.
  • the free train after the first rotating transfer element 40 is thus preferably the first free train in the web run. Accordingly, the fibrous web 46 is in this case in the web running direction L considered starting from the former for the first time in connection to the first rotating transfer element 40 guided in a free train.
  • the machine 10 expediently for a ropeless transfer of the fibrous web 46, starting from the former to the beginning of first drying group 22 in a full web width step.
  • the fibrous web 46 is guided via an example straight transfer section 50, which may also be slightly curved, to a first, in particular larger, support roller 52 with associated impingement or impingement dryer 54.
  • 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.
  • such a larger support roller has a diameter of at least 3 m.
  • the support roller 52 is looped by a first, executed in particular as a sieve drying belt 18.
  • the fibrous web 46 guided around the looped support roll 52 is subjected to a hot air and / or superheated steam impingement by the impingement dryer 54.
  • the first support roller 52 may be an upper support roller, that is, the fibrous web 46 is supplied to this roller from the bottom up and removed from top to bottom of this roller again.
  • the impingement dryer 54 is arranged, for example, in the upper region of this first support roller 52.
  • the transfer section 50 is formed by a screen 60 guided around two suction rollers 56, 58, to which one or more foil and / or vacuum boxes 62 are associated for holding the fibrous web on the screen 60.
  • the first suction roll 56 removes the fibrous web from one of the press nip 48 expiring press belt or felt 64, while the second Suction roller 58 holds the fibrous web, in particular only during the deflection around this roller. In the area of the first suction roll 56, the fibrous web can also be removed, for example, from a transfer belt.
  • a second, in particular larger support roller 66 with associated impingement or impingement dryer 68 is provided.
  • the transfer takes place immediately in front of the second support roller 66.
  • the region in which the second suction roll 58 of the transfer line 50, besides the transfer felt 60 and the fibrous web, is also looped around by the particular, especially sieve-like, drying belt 18 guided around the first, in particular larger, backing roll 52 can be variably adjustable. This results in a variable "sandwich" wrap.
  • the respective wrap area can be variably adjustable via an adjustable roller (not shown) arranged within the loop of the first drying belt 18.
  • the two support rollers 52, 66 are as well as the two boxes 62 each acted upon with vacuum.
  • the second support roller 66 is a lower roller, that is to say the fibrous web is supplied from the top to the bottom of this roller and removed from the bottom to the top of this roller.
  • the impingement dryer 68 is arranged here, for example, in the region of the lower right quadrant of the support roller 66.
  • the two support rollers 52, 66, each with an associated impingement dryer 54 or 68 can therefore be arranged in the web running direction L directly after the press section 14 and before the first cylinder drying section 22.
  • the two impingement dryers 54, 68 may each comprise a hot air and / or superheated steam hood 68 and 70, respectively.
  • the transfer line 50 runs horizontally. In principle, however, it can also run slightly horizontally to the horizontal or slightly curved.
  • FIG. 2 shows in a schematic partial view of another embodiment of the machine 10, which differs from that of FIG. 1 essentially differs by another embodiment of the impingement drying section 16.
  • the fibrous web 46 is transferred from the first drying belt 18 assigned to the first impingement dryer 54 to the second and last drying belt 44 assigned to the two further impingement dryers 76, 78.
  • the at least substantially vertical impingement stretches in the region of the support rollers 80 and 82 can be slightly curved. Accordingly, results over these routes a slightly curved track guide.
  • the fibrous web 46 can, for example, be taken over again by a wire 60 from the press belt or felt 64 in the region of a suction roll 56. Unlike the execution according to FIG. 1 In the present case, however, the fibrous web 46 with the wire 60 is not transferred via an at least substantially horizontal transfer section, but shortly after the suction roller 26 to the guided around a first Saugleitwalze 84 drying belt 18, the fibrous web 46 following another, behind the support rollers 74 provided Saugleitwalze 86 passes to the second last drying belt 44.
  • the two groups of support rollers 80 and 82 between an upper guide roller 88 and a lower guide roller 90 are arranged, over which the second and last drying belt 44 is guided.
  • the last drying belt 44 is fed together with the fibrous web via the upper deflection roller 18 to the first rotating transfer element 40 of the transfer belt section 20.
  • the relatively smaller support rollers 74, 80, 82 are in particular smaller than the drying cylinders 26 to 30 and the guide rollers 32, 34 of the first dryer group. In particular, they can also be smaller than the first rotating transfer element 40, in particular formed by a cylinder or a roller. In any case, they are significantly smaller than the support rollers 52, 66 of the first embodiment according to FIG. 1 ,
  • the impingement dryer 54, 76, 78 may each be provided again with a hot air and / or hot steam hood.
  • this embodiment has at least substantially the same structure as that of FIG. 1 , Corresponding parts are assigned the same reference numerals.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The dryer section (14) has a transfer section (20) with a rotating transfer unit (40) that is formed by a cylinder and roller and a transfer suction roller (42) that is clasped by a dryer fabric (24) of a dryer group (22). A fiber web (46) e.g. paper web, is conveyed to the rotating transfer unit together with a sieve-like dryer band (44) of an impingement drying section (16). The dryer band is led away from the fiber web and rotating transfer unit before the discharge of the fiber web. The fiber web is transferred from the rotating transfer unit to the suction roller in a free movement.

Description

Die Erfindung betrifft eine Trockenpartie für eine Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn, insbesondere Papier-, Karton- oder Tissuebahn, mit einem ein oder mehrere Trockenbänder umfassenden Impingement-Trocknungsabschnitt, in dem die Faserstoffbahn gestützt auf einem jeweiligen Trockenband mit Heißluft und/oder Dampf beaufschlagbar ist, einem sich in Bahnlaufrichtung an den Impingement-Trocknungsabschnitt anschließenden Transferabschnitt, und einer sich in Bahnlaufrichtung an den Transferabschnitt anschließenden ersten Trockengruppe mit zugeordnetem Trockensieb, in der die Faserstoffbahn zusammen mit dem Trockensieb um zumindest einen Trockenzylinder und zumindest eine Leitwalze mit zugeordnetem Stabilisator, vorzugsweise Hochvakuum-Stabilisator, geführt ist, wobei die Faserstoffbahn über den Transferabschnitt von dem Impingement-Trocknungsabschnitt an die erste Trockengruppe übergeben wird. Sie betrifft ferner eine Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn, insbesondere Papier-, Karton- oder Tissuebahn.The invention relates to a dryer section for a machine for producing and / or treating a fibrous web, in particular paper, board or tissue web, comprising an impingement drying section comprising one or more drying belts in which the fibrous web is supported on a respective drying belt with hot air and / or or steam can be acted upon, one in the web running direction of the impingement drying section subsequent transfer section, and in the web direction to the transfer section subsequent first dryer group with associated dryer fabric in which the fibrous web together with the dryer fabric around at least one drying cylinder and at least one guide roll with associated Stabilizer, preferably high-vacuum stabilizer, is performed, wherein the fibrous web is transferred via the transfer section from the impingement drying section to the first drying group. It further relates to a machine for producing and / or treating a fibrous web, in particular paper, board or tissue web.

Dabei kann der Impingement-Trocknungsabschnitt eine oder mehrere Impingement-Einheiten umfassen, in denen die Faserstoffbahn jeweils gestützt auf einem Trockenband jeweils beispielsweise über eine größere oder mehrere kleinere Stützwalzen geführt ist. Der einer jeweiligen Leitwalze der ersten Trockengruppe zugeordnete Stabilisator dient insbesondere dazu, die Abnahme der Faserstoffbahn von einem jeweiligen Trockenzylinder zu unterstützen und die Bahn bei der Überführung von dem betreffenden Trockenzylinder zu der Leitwalze und/oder bei der Überführung der Faserstoffbahn von der Leitwalze zu einem jeweiligen weiteren Trockenzylinder an dem betreffenden Trockensieb zu halten.In this case, the impingement drying section may comprise one or more impingement units in which the fibrous web is guided, in each case supported on a drying belt, in each case, for example, over a larger or a plurality of smaller support rollers. The stabilizer associated with a respective guide roll of the first dryer group serves, in particular, to assist the removal of the fibrous web from a respective drying cylinder and the web during the transfer from the relevant drying cylinder to the guide roll and / or during the transfer to keep the fibrous web from the guide roll to a respective further drying cylinder on the respective drying wire.

Der Impingement-Trocknungsabschnitt dient in erster Linie der Steigerung des Trockengehalts- und damit einer Festigkeitssteigerung der Faserstoffbahn nach der Pressenpartie, wodurch höhere Maschinenlaufgeschwindigkeiten ermöglicht werden. Da die den Leitwalzen bzw. Trockenzylindern in den Trockengruppen zugeordneten Stabilisatoren, die bevorzugt eine Hochvakuum-Ablösezone umfassen, die Abnahme der Faserstoffbahn vom betreffenden glatten Trockenzylinder unterstützten, sind auch insoweit wieder höhere Maschinenlaufgeschwindigkeiten möglich.The impingement drying section serves primarily to increase the Trockengehalts- and thus an increase in strength of the fibrous web after the press section, whereby higher machine speeds are possible. Since the stabilizers assigned to the guide rolls or drying cylinders in the dryer groups, which preferably comprise a high-vacuum release zone, assist the decrease in the fibrous web from the respective smooth drying cylinder, higher machine speeds are also possible in this respect.

Aus der DE 10 2004 037 245 A1 ist bereits eine Papiermaschine bekannt, welche einen Impingement-Trocknungsabschnitt mit nachfolgender Trockenpartie aufweist, jedoch ist der Bahnübergang zwischen diesen beiden Abschnitten nicht genauer spezifiziert.From the DE 10 2004 037 245 A1 A paper machine is already known which has an impingement drying section with subsequent drying section, but the level crossing between these two sections is not specified in more detail.

Aus der DE 199 34 777 A1 ist bereits eine Papiermaschine bekannt, bei der die Faserstoffbahn zusammen mit einem Pressfilz durch den letzten Pressnip der Pressenpartie geführt und die Faserstoffbahn mittels des Trockensiebes der ersten Trockengruppe von dem Pressfilz übernommen wird. Die Faserstoffbahn wird also zwischen der Pressenpartie und der ersten Trockengruppe ständig von wenigstens einem Band oder einer Walze gestützt. Dabei besitzt die erste Trockengruppe nur einen einzigen Trockenzylinder.From the DE 199 34 777 A1 A paper machine is already known in which the fibrous web is guided together with a press felt through the last press nip of the press section and the fibrous web is taken over by means of the dryer wire of the first dryer group of the press felt. The fibrous web is thus constantly supported by at least one belt or roller between the press section and the first dryer section. The first dryer group has only a single drying cylinder.

Wollte man nun den Einsatz eines Impingement-Trocknungsabschnitt mit dem Einsatz von Hochvakuum-Stabilisatoren in einer sich an den Impingement-Trocknungsabschnitt anschließenden Trockengruppe kombinieren, so bestünde nach wie vor das Problem, dass diese bei der Überführung der Faserstoffbahn nicht voll genutzt werden können.If it were now desired to combine the use of an impingement drying section with the use of high-vacuum stabilizers in a subsequent dryer section to the impingement drying section, then there would still be the problem that they can not be fully utilized in the transfer of the fibrous web.

Im Normalbetrieb wird zwar durch die Impingement-Trocknung eine erhöhte Festigkeit und durch die Hochvakuum-Stabilisatoren eine Reduzierung der Ablösekräfte erreicht, wobei sich die positiven Effekte addieren und die Geschwindigkeit aufgrund dieser beiden Effekte erhöht werden kann. Im Fall eines Abrisses und/oder beim Überführen der Faserstoffbahn wird die Bahn üblicherweise am ersten Trockenzylinder der ersten Trockengruppe in den Pulper gefahren. Damit es nun aber nicht zu einem unkontrollierten Selbstüberführen kommt, muss der Hochvakuum-Stabilisator nach dem ersten Trockenzylinder der ersten Trockengruppe abgeschaltet oder zumindest stark gedrosselt werden, da andernfalls die Faserstoffbahn stets wieder mit dem betreffenden Trockensieb der ersten Trockengruppe mitgenommen würde. Wird nun der Überführstreifen der Faserstoffbahn durch die Trockenpartie überführt, so fehlt entsprechend die positive Wirkung des Stabilisators. Um dies auszugleichen, muss die Bahnspannung durch eine erhöhte Differenzgeschwindigkeit bzw. einen erhöhten Zug zwischen der Pressenpartie und der Trockenpartie ausgeglichen werden. Erst nach einem erfolgreichen Überführen und Breitfahren können der Hochvakuum-Stabilisator wieder voll eingeschaltet und die Bahnspannung reduziert werden.In normal operation, an increased strength is achieved by the impingement drying and by the high-vacuum stabilizers, a reduction of the detachment forces, whereby the positive effects add up and the speed can be increased due to these two effects. In the case of a tear and / or during the transfer of the fibrous web, the web is usually driven into the pulper at the first drying cylinder of the first drying group. So that it does not come to an uncontrolled self-transfer, the high-vacuum stabilizer must be switched off after the first drying cylinder of the first dryer group or at least severely throttled, otherwise the fibrous web would always be taken back with the relevant dryer fabric of the first dryer group. Now, if the transfer strip of the fibrous web is transferred through the dryer section, then the positive effect of the stabilizer is missing accordingly. To compensate for this, the web tension must be compensated by an increased differential speed or an increased tension between the press section and the dryer section. Only after successful transfer and widening can the high-vacuum stabilizer be fully switched on again and the web tension reduced.

Diese bisher üblichen Trockenpartien bzw. Papiermaschinen weisen somit insbesondere den Nachteil auf, dass das Festigkeitspotenzial der nassen Papierbahn bzw. das Geschwindigkeitspotenzial der Papiermaschine nicht voll ausgenutzt werden können. Es muss stets noch etwas Reserve bleiben, damit während des Überführens der Faserstoff- bzw. Papierbahn die Bahnspannung durch höhere Züge erhöht werden kann.These hitherto customary dryer sections or paper machines thus have the particular disadvantage that the strength potential of the wet paper web or the speed potential of the paper machine can not be fully utilized. There must always remain some reserve, so that during the transfer of the pulp or paper web, the web tension can be increased by higher trains.

Der Erfindung liegt die Aufgabe zugrunde, eine verbesserte Trockenpartie sowie eine verbesserte Maschine der eingangs genannten Art zu schaffen, mit denen die zuvor genannten Nachteile beseitigt sind. Dabei soll insbesondere erreicht werden, dass stets das volle Geschwindigkeitspotenzial der Impingement-Trocknung sowie des Stabilisators genutzt werden kann.The invention has for its object to provide an improved dryer section and an improved machine of the type mentioned, with which the aforementioned disadvantages are eliminated. In particular, it should be ensured that the full speed potential of the impingement drying and of the stabilizer can always be utilized.

Bezüglich der Trockenpartie wird diese Aufgabe erfindungsgemäß dadurch gelöst, dass der Transferabschnitt ein insbesondere durch einen Zylinder oder eine Walze gebildetes erstes rotierendes Transferelement und eine von diesem beabstandete, vom Trockensieb der ersten Trockengruppe umschlungene Transfersaugwalze umfasst, wobei die Faserstoffbahn zusammen mit dem vorzugsweise siebartigen letzten Trockenband des Impingement-Trocknungsabschnitts dem ersten rotierenden Transferelement zugeführt ist, das letzte Trockenband vor dem Ablauf der Faserstoffbahn von dem ersten rotierenden Transferelement von der Faserstoffbahn und dem ersten rotierenden Transferelement weggeführt ist und die Faserstoffbahn in freiem Zug von dem ersten rotierenden Transferelement an die vom Trockensieb der ersten Trockengruppe umschlungene Transfersaugwalze übergeben wird.With regard to the dryer section, this object is achieved according to the invention in that the transfer section comprises a first rotating transfer element formed in particular by a cylinder or a roller and a transfer suction roll spaced therefrom and wrapped by the dryer wire of the first dryer group, wherein the fibrous web together with the last, preferably dry sieve the impingement drying section is fed to the first rotating transfer element, the last drying belt is led away from the fibrous web and the first rotating transfer element from the first rotating transfer element before the end of the fibrous web, and the fibrous web is moved freely from the first rotating transfer element to the dryer fabric first transfer group wrapped transfer suction roll is passed.

Aufgrund dieser Ausbildung kann stets das volle Geschwindigkeitspotenzial sowohl der Impingement-Trocknung als auch des Stabilisators, insbesondere Hochvakuum-Stabilisators genutzt werden. Eine höhere Produktionsgeschwindigkeit ist zum einen dadurch möglich, dass die Impingement-Trocknung die Festigkeit der nassen Faserstoffbahn erhöht. Zum anderen ist die Haftung der Faserstoffbahn an dem auf den Impingement-Trocknungsabschnitt folgenden, insbesondere durch einen Zylinder oder eine Walze gebildeten ersten rotierenden Element deutlich reduziert, da dieses nunmehr in geringerem Maße als bisher von dem betreffenden, zum Beispiel siebartigen Trocknungsband des Impingement-Trocknungsabschnitts umschlungen ist. Die Faserstoffbahn löst sich also wesentlich leichter von dem ersten rotierenden Transferelement ab, sodass eine höhere Bahnspannung bzw. Stabilisatoren bzw. Hochvakuum-Stabilisatoren erst im Bereich der auf das erste rotierende Transferelement folgenden Trockenzylinder oder Leitwalzen der Trockengruppe bzw. Trockengruppen benötigt werden. Am durch einen Zylinder oder eine Walze gebildeten ersten rotierenden Transferelement ist ein solcher Stabilisator nicht mehr erforderlich. Im Fall eines Bahnrisses läuft die Faserstoffbahn an dem ersten rotierenden Transferelement in den Pulper. Die Gefahr einer störenden Selbstüberführung ist beseitigt. Zudem kann der betreffende Stabilisator bzw. Hochvakuum-Stabilisator am ersten Trockenzylinder bzw. einer benachbarten Leitwalze voll in Betrieb bleiben. Eine Zugerhöhung ist somit nicht erforderlich. Es ergibt sich somit eine optimale Kombination des Einsatzes eines Impingement-Trocknungsabschnitts mit dem Einsatz wenigstens eines Stabilisators, insbesondere Hochvakuum-Stabilisators, wodurch sehr hohe Produktionsgeschwindigkeiten ermöglicht werden.Due to this design, the full speed potential of both the impingement drying and the stabilizer, in particular high-vacuum stabilizer can always be used. On the one hand, a higher production speed is possible because the impingement drying increases the strength of the wet fibrous web. On the other hand, the adhesion of the fibrous web to the following on the impingement drying section, formed in particular by a cylinder or a roller first rotating element is significantly reduced, as this now to a lesser extent than before of the relevant, for example sieve-like drying belt of the impingement drying section is entwined. The fibrous web therefore dissolves much more easily from the first rotating transfer element, so that a higher web tension or stabilizers or high-vacuum stabilizers are required only in the area of the drying cylinder or guide rolls of the drying group or drying groups following the first rotating transfer element. Am by a cylinder or a roller formed first rotating transfer element, such a stabilizer is no longer necessary. In the case of a web break, the fibrous web runs on the first rotating transfer element in the pulper. The danger of a disturbing self-transfer is eliminated. In addition, the respective stabilizer or high-vacuum stabilizer on the first drying cylinder or an adjacent guide roller can remain fully operational. A Zugerhöhung is therefore not required. This results in an optimal combination of the use of an impingement drying section with the use of at least one stabilizer, in particular high-vacuum stabilizer, whereby very high production speeds are made possible.

Der Impingement-Trocknungsabschnitt kann nur ein oder auch mehrere Trockenbänder umfassen, wobei im ersten Fall das letzte Trockenband entsprechend durch das einzige Trockenband gebildet ist.The impingement drying section may comprise only one or more drying belts, wherein in the first case the last drying belt is correspondingly formed by the single drying belt.

Bevorzugt ist zumindest dem in Bahnlaufrichtung ersten Trockenzylinder und/oder der ersten Leitwalze der ersten Trockengruppe ein Stabilisator bzw. Hochvakuumstabilisator zugeordnet. Ein solcher Stabilisator dient in erster Linie der Unterstützung der Bahnabnahme vom betreffenden Trockenzylinder. Grundsätzlich kann beispielsweise auch ein Duostabilisator vorgesehen sein, durch den zusätzlich die Faserstoffbahn im Anschluss an den Ablauf von der Leitwalze am Trockensieb gehalten wird.Preferably, at least the first drying cylinder in the direction of web travel and / or the first guide roller of the first drying group is assigned a stabilizer or high-vacuum stabilizer. Such a stabilizer serves primarily to assist the web removal from the respective drying cylinder. Basically, for example, a Duostabilisator be provided by the addition of the fibrous web is held following the expiration of the guide roller on the dryer.

Von Vorteil ist insbesondere auch, wenn die Transfersaugwalze zur Änderung des Abstandes zwischen dieser und dem ersten rotierenden Transferelement verstellbar ist. Dabei ist die Transfersaugwalze vorzugsweise entsprechend verschwenkbar.It is particularly advantageous if the transfer suction roll is adjustable to change the distance between the latter and the first rotating transfer element. In this case, the transfer suction roll is preferably pivotable accordingly.

Gemäß einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Trockenpartie ist die Transfersaugwalze zwischen einer Überführ- oder Abrissposition, in der sie einen relativ größeren Abstand zum ersten rotierenden Transferelement aufweist, und einer Betriebsposition verstellbar, in der sie einen relativ kleineren Abstand zum ersten rotierenden Transferelement aufweist. Beim Überführen der Bahn bzw. einem Bahnabriss ist der betreffende Abstand also größer als während des normalen Betriebs der betreffenden Maschine.According to a preferred practical embodiment of the dryer section according to the invention, the transfer suction roll is adjustable between a transfer or tear-off position in which it has a relatively greater distance from the first rotating transfer element and an operating position in which it has a relatively smaller distance from the first rotating transfer element. When transferring the web or a web break so the distance is greater than during normal operation of the machine in question.

Bevorzugt beträgt bei ihre Überführ- oder Abrissposition einnehmender Transfersaugwalze der Abstand zwischen deren Oberfläche und der Oberfläche des ersten rotierenden Transferelements zumindest 50 mm, wobei er vorteilhafterweise größer als 70 mm ist.The distance between its surface and the surface of the first rotating transfer element is preferably at least 50 mm at its transfer or tear-off position engaging the transfer or tear-off position, wherein it is advantageously greater than 70 mm.

Von Vorteil ist insbesondere auch, wenn bei ihre Betriebsposition einnehmender Transfersaugwalue der Abstand zwischen deren Oberfläche und der Oberfläche des ersten rotierenden Transferelements kleiner als 30 mm und vorzugsweise kleiner als 10 mm ist.It is also of particular advantage if the distance between its surface and the surface of the first rotating transfer element is less than 30 mm and preferably less than 10 mm at its operating position of the transfer suction whale.

Vorteilhafterweise ist das erste rotierende Transferelement über einen Bereich kleiner als 190°, vorzugsweise kleiner als 160° von dem letzten Trockenband des Impingement-Trocknungsabschnitt umschlungen. Aufgrund dieses relativ geringen Umschlingungswinkels ist die Haftung der Faserstoffbahn an dem ersten rotierenden Transferelement deutlich verringert.Advantageously, the first rotating transfer element is looped over an area smaller than 190 °, preferably smaller than 160 °, from the last drying belt of the impingement drying section. Because of this relatively low angle of wrap, the adhesion of the fibrous web to the first rotating transfer element is significantly reduced.

Das erste rotierende Transferelement kann beispielsweise durch einen insbesondere dampfbeheizten Zylinder oder beispielsweise auch durch eine nicht beheizte Leitwalze gebildet sein.The first rotating transfer element can be formed for example by a particular steam-heated cylinder or, for example, by an unheated guide roll.

Von Vorteil ist insbesondere auch, wenn das erste rotierende Transferelement mit einer die Abnahme der Faserstoffbahn unterstützenden Außenbeschichtung versehen ist. Auch dadurch wird wieder eine Reduzierung der Haftung der Bahn an dem ersten rotierenden Transferelement reduziert.It is also particularly advantageous if the first rotating transfer element is provided with an outer coating which supports the decrease of the fibrous web. This also reduces the adhesion of the web to the first rotating transfer element.

Die Außenbeschichtung kann zweckmäßigerweise zumindest teilweise aus Metallcarbid-Teflon und/oder Keramik bestehen.The outer coating may expediently consist at least partially of metal carbide Teflon and / or ceramic.

Gemäß einer vorteilhaften Ausführungsform ist das erste rotierende Transferelement durch eine Leitwalze mit einer Mantelfläche aus porösem Material gebildet. Es kann somit Luft von innen durch die poröse Mantelfläche hindurch geblasen werden, wodurch wieder die Haftung der Bahn an der Leitwalze entsprechend verringert wird.According to an advantageous embodiment, the first rotating transfer element is formed by a guide roll with a lateral surface of porous material. Air can thus be blown from the inside through the porous lateral surface, which in turn reduces the adhesion of the web to the guide roller.

Die Trockenpartie kann im Anschluss an den Impingement-Trocknungsabschnitt und dem Transferabschnitt eine oder auch mehrere Trockengruppen mit jeweils wenigstens einem zugeordneten Trockensieb umfassen. Dabei sind bevorzugt überwiegend einreihige Trockengruppen vorgesehen. Von Vorteil ist dabei insbesondere, wenn zumindest 70 % der Trockenzylinder einreihig angeordnet sind.After the impingement drying section and the transfer section, the drying section may comprise one or more drying groups, each with at least one associated drying wire. In this case, preference is given to predominantly single-row drying groups. It is particularly advantageous if at least 70% of the drying cylinders are arranged in a single row.

Die erste Trockengruppe kann zweckmäßigerweise zumindest zwei Trockenzylinder aufweisen, wobei sie vorzugsweise drei Trockenzylinder aufweist.The first drying group can expediently have at least two drying cylinders, wherein it preferably has three drying cylinders.

Von Vorteil ist insbesondere auch, wenn die sich in Bahnlaufrichtung an die erste Trockengruppe anschließende zweite Trockengruppe zumindest zwei und vorzugsweise drei Trockenzylinder aufweist.It is also particularly advantageous if the second drying group adjoining the first drying group in the web running direction has at least two and preferably three drying cylinders.

Gemäß einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Trockenpartie besitzt die Faserstoffbahn in Bahnlaufrichtung unmittelbar vor dem Impingement-Trocknungsabschnitt bei holzfreiem Papier einen Trockengehalt in einem Bereich von etwa 46 % bis etwa 58 %.According to a preferred practical embodiment of the dryer section according to the invention, the fibrous web in the web running direction immediately before the impingement drying section has a dry content in a wood-free paper in a range from about 46% to about 58%.

Bei holzhaltigem Papier ist es von Vorteil, wenn die Faserstoffbahn in Bahnlaufrichtung unmittelbar vor dem Impingement-Trocknungsabschnitt einen Trockengehalt in einem Bereich von etwa 48 % bis etwa 60 % besitzt.For wood-containing paper, it is advantageous if the fibrous web has a solids content in the web running direction immediately before the impingement drying section in a range from about 48% to about 60%.

Bei holzfreiem Papier besitzt die Faserstoffbahn in Bahnlaufrichtung unmittelbar nach dem Impingement-Trocknungsabschnitt zweckmäßigerweise einen Trockengehalt von zumindest 49 %.In wood-free paper, the fibrous web in the web running direction immediately after the impingement drying section expediently has a solids content of at least 49%.

Dagegen besitzt sie bei holzhaltigem Papier in Bahnlaufrichtung unmittelbar nach dem Impingement-Trocknungsabschnitt bevorzugt einen Trockengehalt von zumindest 52 %.By contrast, it preferably has a solids content of at least 52% in wood-containing paper in the web running direction immediately after the impingement drying section.

Die erfindungsgemäße Trockenpartie umfasst somit einen Impingement-Trocknungsabschnitt und einen unmittelbar darauffolgenden ersten Zylinder oder erste Walze, auf den bzw. die direkt ein freier Zug erfolgt. Zudem umfasst der Transferabschnitt eine Transfersaugwalze, die zwischen einem größeren Abstand zum ersten Zylinder bzw. Walze beim Überführen der Faserstoffbahn und einem kleineren Abstand im Normalbetrieb nach erfolgreichen Breitfahren verstellbar, vorzugsweise verschwenkbar ist. Das nachfolgende Trockensieb der ersten Trockengruppe berührt bzw. umschlingt den ersten auf den Impingement-Trocknungsabschnitt folgenden Zylinder bzw. Walze nicht.The dryer section according to the invention thus comprises an impingement drying section and an immediately following first cylinder or first roller, onto which or directly a free draw takes place. In addition, the transfer section comprises a transfer suction roll, which is adjustable, preferably pivotable, between a greater distance to the first cylinder or roller when transferring the fibrous web and a smaller distance in normal operation after successful spreading. The following dryer fabric of the first drying group does not touch or wrap around the first cylinder or roll following the impingement drying section.

Der erste auf dem Impingement-Trocknungsabschnitt folgende Zylinder bzw. Walze kann zur besseren Bahnabnahme speziell beschichtet sein, insbesondere eine Metallcarbid-Teflon-Beschichtung oder eine Keramikschicht aufweisen.The first cylinder or roller following the impingement drying section may be specially coated for better web removal, in particular having a metal carbide Teflon coating or a ceramic layer.

Die erfindungsgemäße Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn, insbesondere Papier-, Karton- oder Tissuebahn zeichnet sich dadurch aus, dass sie neben einem Former und einer Pressenpartie eine erfindungsgemäße Trockenpartie umfasst.The machine according to the invention for producing and / or treating a fibrous web, in particular a paper, board or tissue web, is characterized in that, in addition to a former and a press section, it comprises a dryer section according to the invention.

Bevorzugt schließt sich der Impingement-Trocknungsabschnitt in Bahnlaufrichtung ohne dazwischenliegenden dampfbeheizten Zylinder an die Pressenpartie an. Der Impingement-Trocknungsabschnitt folgt also direkt auf die Pressenpartie, ohne dass irgendein dampfbeheizter Zylinder dazwischen angeordnet ist.Preferably, the impingement drying section adjoins the press section in the web running direction without intermediate vapor-heated cylinders. Thus, the impingement drying section follows directly onto the press section without any vapor-heated cylinder interposed therebetween.

Von Vorteil ist insbesondere auch, wenn die Faserstoffbahn durchgehend in geschlossenem Zug durch die Pressenpartie geführt ist. Bevorzugt ist dabei die Faserstoffbahn in Bahnlaufrichtung betrachtet ausgehend vom Former erstmalig im Anschluss an das erste rotierende Transferelement in freiem Zug geführt. Die Pressenpartie kann beispielsweise eine Tandem-Presse oder eine DuoCentri-Presse mit Centerbelt umfassen.It is particularly advantageous if the fibrous web is continuously guided in a closed train through the press section. Preferably, the fibrous web is viewed in the web running direction, starting from the former for the first time after the first rotating transfer element guided in a free train. The press section can for example comprise a tandem press or a DuoCentri press with center belt.

Bevorzugt ist die Maschine für ein seilloses Überführen der Faserstoffbahn ausgehend von dem Former, das heißt der ersten Pickup-Stelle, bis zum Beginn der ersten Trockengruppe in einem Schritt mit voller Bahnbreite ausgeführt. Die Faserstoffbahn kann also mit voller Bahnbreite in einem Schritt seillos mit voller Bahnbreite durch die Pressenpartie und den Impingement-Trocknungsabschnitt geführt werden.Preferably, the machine is for a ropeless transfer of the fibrous web starting from the former, that is, the first pickup point, carried out to the beginning of the first drying group in a step with full web width. The fibrous web can thus be guided with full web width in one step without ropes with full web width through the press section and the impingement drying section.

Die Erfindung wird im Folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:

Figur 1
eine schematische Teildarstellung einer beispielhaften erfindungsgemäßen Maschine mit einer beispielhaften Ausführungsform der erfindungsgemäßen Trockenpartie, deren Impingement-Trocknungsabschnitt zwei größere Stützwalzen umfasst, und
Figur 2
eine schematische Teildarstellung einer weiteren Ausführungsform der erfindungsgemäßen Maschine mit einer weiteren beispielhaften Ausführungsform der erfindungsgemäßen Trockenpartie, wobei deren Impingement-Trocknungsabschnitt mehrere kleinere Stützwalzen umfasst.
The invention will be explained in more detail below with reference to exemplary embodiments with reference to the drawing; in this show:
FIG. 1
a schematic partial view of an exemplary machine according to the invention with an exemplary embodiment of the dryer section according to the invention, the impingement drying section comprises two larger support rollers, and
FIG. 2
a schematic partial view of another embodiment of the machine according to the invention with a further exemplary embodiment of the drying section according to the invention, wherein the impingement drying section comprises a plurality of smaller support rollers.

Figur 1 zeigt in schematischer Teildarstellung eine beispielhafte Ausführungsform einer Maschine 10 zur Herstellung und/oder Behandlung einer Faserstoffbahn, bei der es sich insbesondere um eine Papier-, Karton- oder Tissuebahn handeln kann. FIG. 1 shows a schematic partial representation of an exemplary embodiment of a machine 10 for the production and / or treatment of a fibrous web, which may be in particular a paper, board or tissue web.

Die Maschine 10 umfasst einen (nicht dargestellten) Former, eine Pressenpartie 12 und eine Trockenpartie 14.The machine 10 comprises a former (not shown), a press section 12 and a dryer section 14.

Die Trockenpartie umfasst einen hier beispielsweise zwei Trockenbänder 18, 44 umfassenden Impingement-Trocknungsabschnitt 16, in dem die Faserstoffbahn gestützt auf einem jeweiligen Trockenband 18 bzw. 44 mit Heißluft und/oder Dampf beaufschlagt wird. Zudem umfasst diese Trockenpartie 14 einen sich in Bahnlaufrichtung L unmittelbar an den Impingement-Trocknungsabschnitt 16 anschließenden Transferabschnitt 20 und eine sich in Bahnlaufrichtung L an den Transferabschnitt 20 anschließende erste Trockengruppe 22 mit zugeordnetem Trockensieb 24, in der die Faserstoffbahn 46 zusammen mit dem Trockensieb 24 und zumindest einen Trockenzylinder 26 bis 30 und zumindest eine Leitwalze 32, 34 mit zugeordnetem Stabilisator 36, 38, vorzugsweise Hochvakuum-Stabilisator geführt ist. Dabei wird die Faserstoffbahn über den Transferabschnitt 20 von dem Impingement-Trocknungsabschnitt 16 an die erste Trockengruppe 22 übergeben.The drying section comprises an impingement drying section 16, here comprising, for example, two drying belts 18, 44, in which the fibrous web is subjected to hot air and / or steam, supported on a respective drying belt 18 and 44, respectively. In addition, this drying section 14 comprises a transfer section 20 adjoining the impingement drying section 16 in the web running direction L and a subsequent drying group 22 in the web running direction L to the transfer section 20 with associated dryer fabric 24, in which the fibrous web 46 together with the dryer fabric 24 and at least one drying cylinder 26 to 30 and at least one guide roll 32, 34 with associated stabilizer 36, 38, preferably high-vacuum stabilizer is performed. In this case, the fibrous web is transferred via the transfer section 20 from the impingement drying section 16 to the first dryer section 22.

Der Transferabschnitt 20 umfasst ein durch einen Zylinder oder eine Walze gebildetes erstes rotierendes Transferelement 40 und eine von diesem beabstandete, vom Trockensieb 24 der ersten Trockengruppe 22 umschlungene Transfersaugwalze 42.The transfer section 20 comprises a first rotating transfer element 40 formed by a cylinder or a roller and a transfer suction roll 42 spaced therefrom and wrapped by the drying wire 24 of the first drying group 22.

Die Faserstoffbahn 46 wird zusammen mit dem hier vorzugsweise als Sieb ausgeführten letzten Trockenband 44 des Impingement-Trocknungsabschnitts 16 dem ersten rotierenden Transferelement 40 zugeführt.The fibrous web 46 is fed to the first rotating transfer element 40 together with the last drying belt 44 of the impingement drying section 16, which is preferably embodied here as a sieve.

Das letzte Trockenband 44 wird vor dem Ablauf der Faserstoffbahn 46 von dem ersten rotierenden Transferelement 42 von der Faserstoffbahn und dem ersten rotierenden Transferelement 42 getrennt. Im Anschluss daran kann das erste rotierende Transferelement 40 dann noch ein Stück allein von der Faserstoffbahn 46 umschlungen sein. Die Faserstoffbahn 46 wird dann in freiem Zug von dem ersten rotierenden Transferelement 40 an die vom Trockensieb 24 der ersten Trockengruppe 22 umschlungene Transfersaugwalze 42 übergeben.The last drying belt 44 is separated from the fibrous web and the first rotating transfer element 42 before the end of the fibrous web 46 by the first rotating transfer element 42. Following this, the first rotating transfer element 40 can then be wrapped around the fibrous web 46 for a while. The fibrous web 46 is then transferred in a free pass from the first rotating transfer element 40 to the transfer suction roll 42, which is looped around by the drying wire 24 of the first drying group 22.

Zumindest dem in Bahnlaufrichtung L ersten Trockenzylinder 26 und/oder der ersten Leitwalze 32 der ersten Trockengruppe 22 ist ein Stabilisator 36, 38 zugeordnet, bei dem es sich bevorzugt um einen Hochvakuum-Stabilisator handelt.At least the first in the web running direction L drying cylinder 26 and / or the first guide roller 32 of the first dryer group 22 is a Stabilizer assigned 36, 38, which is preferably a high-vacuum stabilizer.

Beim vorliegenden Ausführungsbeispiel umfasst die erste Trockengruppe 22 beispielsweise drei Trockenzylinder 26 bis 30, die eine obere Reihe bilden, sowie zwei untere Leitwalzen 32, 34, die zwischen dem ersten und dem zweiten Trockenzylinder 26, 28 bzw. zwischen dem zweiten und dem dritten Trockenzylinder 28, 30 angeordnet sind. Dabei wird die Faserstoffbahn 46 zusammen mit dem Trockensieb 24 vom ersten Trockenzylinder 26 über die Leitwalze 32 zum zweiten Trockenzylinder 28 und über die Leitwalze 34 zum dritten Trockenzylinder 30 geführt. Den beiden Leitwalzen 32, 34 ist jeweils ein bevorzugt als Hochvakuum-Stabilisator ausgeführter Stabilisator 36 bzw. 38 zugeordnet. Dabei unterstützt der erste Stabilisator 36 die Bahnabnahme vom ersten Trockenzylinder 26, während der zweite Stabilisator 38 die Bahnabnahme vom zweiten Trockenzylinder 38 unterstützt. Die Stabilisatoren 32, 34 können insbesondere auch als Duostabilisatoren ausgeführt sein, durch die die Faserstoffbahn 46 zusätzlich nach dem Ablauf von der jeweiligen Leitwalze 32 bzw. 34 am Trockensieb 24 gehalten wird.In the present embodiment, the first drying group 22 comprises, for example, three drying cylinders 26 to 30, which form an upper row, and two lower guide rollers 32, 34 which are between the first and the second drying cylinder 26, 28 and between the second and the third drying cylinder 28 , 30 are arranged. The fibrous web 46 is guided together with the dryer wire 24 from the first drying cylinder 26 via the guide roller 32 to the second drying cylinder 28 and via the guide roller 34 to the third drying cylinder 30. The two guide rollers 32, 34 are each assigned a preferably designed as a high-vacuum stabilizer stabilizer 36 and 38 respectively. The first stabilizer 36 supports the web removal from the first drying cylinder 26, while the second stabilizer 38 supports the web removal from the second drying cylinder 38. The stabilizers 32, 34 may in particular also be designed as Duostabilisatoren, by which the fibrous web 46 is additionally held after the expiration of the respective guide roller 32 and 34 on the drying wire 24.

Die Transfersaugwalze 42 ist zur Änderung des Abstandes zwischen dieser und dem ersten rotierenden Transferelement 40 verstellbar, vorzugsweise verschwenkbar. Dabei kann sie insbesondere zwischen einer Überführ- oder Abrissposition, in der sie einen relativ größeren Abstand zum ersten rotierenden Transferelement 40 aufweist, und einer Betriebsposition verstellbar bzw. verschwenkbar sein, in der sie einen relativ kleineren Abstand zum ersten rotierenden Transferelement 40 besitzt.The transfer suction roll 42 is adjustable to change the distance between it and the first rotating transfer element 40, preferably pivotable. In this case, it can in particular be adjustable or pivotable between a transfer or tear-off position in which it has a relatively greater distance from the first rotating transfer element 40 and an operating position in which it has a relatively smaller distance from the first rotating transfer element 40.

Das erste rotierende Transferelement 40 kann insbesondere über einen Bereich kleiner als 190°, vorzugsweise kleiner als 160° vom letzten Trockenband 44 des Impingement-Trocknungsabschnitts 16 umschlungen sein.The first rotating transfer element 40 can in particular over a range smaller than 190 °, preferably smaller than 160 ° from the last drying belt 44 of the impingement drying section 16.

Bei dem ersten rotierenden Transferelement 40 kann es sich beispielsweise um einen dampfbeheizten Zylinder oder beispielsweise auch um eine nicht beheizte Leitwalze handeln.The first rotating transfer element 40 may, for example, be a steam-heated cylinder or, for example, also a non-heated guide roller.

Zudem kann das erste rotierende Transferelement 40 mit einer die Abnahme der Faserstoffbahn 46 unterstützenden Außenbeschichtung versehen sein. Diese Außenbeschichtung kann beispielsweise zumindest teilweise aus Metallcarbid-Teflon und/oder Keramik bestehen.In addition, the first rotating transfer element 40 may be provided with an outer coating to assist in the removal of the fibrous web 46. This outer coating may, for example, at least partially made of metal carbide Teflon and / or ceramic.

Die Trockenpartie 14 kann eine oder auch mehrere Trockengruppen umfassen.The drying section 14 may comprise one or more drying groups.

Wie anhand der Figur 1 zu erkennen ist, schließt sich der Impingement-Trocknungsabschnitt 16 in Bahnlaufrichtung L ohne dazwischenliegenden dampfbeheizten Zylinder an die Pressenpartie 12 an.As based on the FIG. 1 can be seen, the impingement drying section 16 joins in the web running direction L without intermediate steam-heated cylinder to the press section 12 at.

Die Faserstoffbahn 46 wird bevorzugt durchgehend in geschlossenem Zug durch die Pressenpartie 12 geführt. Dabei kann die Pressenpartie 12 beispielsweise eine Tandem-Presse oder eine DuoCentri-Presse mit Centerbelt umfassen. Der freie Zug nach dem ersten rotierenden Tranferelement 40 ist also bevorzugt der erste freie Zug im Bahnlauf. Entsprechend ist die Faserstoffbahn 46 in diesem Fall in Bahnlaufrichtung L betrachtet ausgehend vom Former erstmalig in Anschluss an das erste rotierende Transferelement 40 in freiem Zug geführt.The fibrous web 46 is preferably guided continuously through the press section 12 in a closed train. In this case, the press section 12 may comprise, for example, a tandem press or a DuoCentri press with center belt. The free train after the first rotating transfer element 40 is thus preferably the first free train in the web run. Accordingly, the fibrous web 46 is in this case in the web running direction L considered starting from the former for the first time in connection to the first rotating transfer element 40 guided in a free train.

Dabei kann die Maschine 10 zweckmäßigerweise für ein seilloses Überführen der Faserstoffbahn 46 ausgehend von dem Former bis zum Beginn der ersten Trockengruppe 22 in einem Schritt mit voller Bahnbreite ausgeführt sein.In this case, the machine 10 expediently for a ropeless transfer of the fibrous web 46, starting from the former to the beginning of first drying group 22 in a full web width step.

Beim vorliegenden Ausführungsbeispiel wird die Faserstoffbahn 46 ausgehend vom letzten Pressnip 48 der Pressenpartie 12 über eine beispielsweise gerade Transferstrecke 50, die auch leicht gekrümmt sein kann, zu einer ersten insbesondere größeren Stützwalze 52 mit zugeordnetem Prallströmungs- oder Impingementtrockner 54 geführt. Unter einer größeren Stützwalze ist hier zum Beispiel eine Stützwalze zu verstehen, deren Durchmesser größer ist als der Durchmesser eines herkömmlichen Trockenzylinders. Bevorzugt besitzt eine solche größere Stützwalze einen Durchmesser von zumindest 3 m.In the present exemplary embodiment, the fibrous web 46, starting from the last press nip 48 of the press section 12, is guided via an example straight transfer section 50, which may also be slightly curved, to a first, in particular larger, support roller 52 with associated impingement or impingement dryer 54. 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 52 ist von einem ersten, insbesondere als Sieb ausgeführten Trockenband 18 umschlungen. Die um die umschlungene Stützwalze 52 geführte Faserstoffbahn 46 wird durch den Impingementtrockner 54 mit einer Heißluft- und/oder Heißdampfprallströmung beaufschlagt.The support roller 52 is looped by a first, executed in particular as a sieve drying belt 18. The fibrous web 46 guided around the looped support roll 52 is subjected to a hot air and / or superheated steam impingement by the impingement dryer 54.

Bei der ersten Stützwalze 52 kann es sich um eine obere Stützwalze handeln, das heißt die Faserstoffbahn 46 wird dieser Walze von unten nach oben zugeführt und von oben nach unten von dieser Walze wieder entfernt. Der Impingementtrockner 54 ist zum Beispiel im oberen Bereich dieser ersten Stützwalze 52 angeordnet.The first support roller 52 may be an upper support roller, that is, the fibrous web 46 is supplied to this roller from the bottom up and removed from top to bottom of this roller again. The impingement dryer 54 is arranged, for example, in the upper region of this first support roller 52.

Die Transferstrecke 50 ist durch ein um zwei Saugwalzen 56, 58 geführtes Sieb 60 gebildet, dem zum Halten der Faserstoffbahn am Sieb 60 ein oder mehrere Foil- und/oder Vakuumkästen 62 zugeordnet sind.The transfer section 50 is formed by a screen 60 guided around two suction rollers 56, 58, to which one or more foil and / or vacuum boxes 62 are associated for holding the fibrous web on the screen 60.

Die erste Saugwalze 56 nimmt die Faserstoffbahn von einem aus dem Pressnip 48 auslaufenden Pressband oder -filz 64 ab, während die zweite Saugwalze 58 die Faserstoffbahn insbesondere nur bei der Umlenkung um diese Walze hält. Im Bereich der ersten Saugwalze 56 kann die Faserstoffbahn beispielsweise auch von einem Transferband abgenommen werden.The first suction roll 56 removes the fibrous web from one of the press nip 48 expiring press belt or felt 64, while the second Suction roller 58 holds the fibrous web, in particular only during the deflection around this roller. In the area of the first suction roll 56, the fibrous web can also be removed, for example, from a transfer belt.

Im vorliegenden Fall ist eine zweite ebenfalls insbesondere größere Stützwalze 66 mit zugeordnetem Prallströmungs- oder Impingementtrockner 68 vorgesehen. Dabei wird die Faserstoffbahn ohne Abnahmesaugwalze direkt vom die erste Stützwalze 52 umschlingenden siebartigen Trockenband 18 auf das die zweite Stützwalze 66 umschlingende siebartige letzte Trockenband 44 bzw. direkt auf die siebumschlungene zweite Stützwalze 66 übergeben. Im vorliegenden Fall erfolgt die Übergabe unmittelbar vor der zweiten Stützwalze 66.In the present case, a second, in particular larger support roller 66 with associated impingement or impingement dryer 68 is provided. In this case, the fibrous web without Abnahmesaugwalze directly from the first support roller 52 wrapped sieve-like drying belt 18 on the second support roller 66 looping sieve last dry belt 44 or passed directly to the sieve entwumpt second support roller 66. In the present case, the transfer takes place immediately in front of the second support roller 66.

Der Bereich, in dem die zweite Saugwalze 58 der Transferstrecke 50 außer von dem Transferfilz 60 und der Faserstoffbahn auch von dem um die erste insbesondere größere Stützwalze 52 geführten insbesondere siebartigen Trockenband 18 umschlungen ist, kann variabel einstellbar sein. Es ergibt sich dann eine variable "Sandwich"-Umschlingung. Dabei kann der betreffende Umschlingungsbereich über eine innerhalb der Schlaufe des ersten Trockenbandes 18 angeordnete verstellbare Walze (nicht gezeigt) variabel einstellbar sein.The region in which the second suction roll 58 of the transfer line 50, besides the transfer felt 60 and the fibrous web, is also looped around by the particular, especially sieve-like, drying belt 18 guided around the first, in particular larger, backing roll 52 can be variably adjustable. This results in a variable "sandwich" wrap. In this case, the respective wrap area can be variably adjustable via an adjustable roller (not shown) arranged within the loop of the first drying belt 18.

Die beiden Stützwalzen 52, 66 sind ebenso wie die beiden Kästen 62 jeweils mit Vakuum beaufschlagbar.The two support rollers 52, 66 are as well as the two boxes 62 each acted upon with vacuum.

Bei der zweiten Stützwalze 66 handelt es sich im vorliegenden Fall um eine untere Walze, das heißt die Faserstoffbahn wird dieser Walze von oben nach unten zugeführt und von unten nach oben von dieser Walze entfernt. Der Impingementtrockner 68 ist hier beispielsweise im Bereich des unteren rechten Quadranten der Stützwalze 66 angeordnet.In the present case, the second support roller 66 is a lower roller, that is to say the fibrous web is supplied from the top to the bottom of this roller and removed from the bottom to the top of this roller. The impingement dryer 68 is arranged here, for example, in the region of the lower right quadrant of the support roller 66.

Die beiden Stützwalzen 52, 66 mit jeweils zugeordnetem Impingementtrockner 54 bzw. 68 können in Bahnlaufrichtung L betrachtet also direkt nach der Pressenpartie 14 und vor der ersten Zylinder-Trockenpartie 22 angeordnet sein.The two support rollers 52, 66, each with an associated impingement dryer 54 or 68 can therefore be arranged in the web running direction L directly after the press section 14 and before the first cylinder drying section 22.

Die beiden Impingementtrockner 54, 68, können jeweils eine Heißluft- und/oder Heißdampfhaube 68 bzw. 70 umfassen.The two impingement dryers 54, 68 may each comprise a hot air and / or superheated steam hood 68 and 70, respectively.

Im vorliegenden Fall verläuft die Transferstrecke 50 waagerecht. Grundsätzlich kann sie jedoch auch zur Waagerechten leicht geneigt oder leicht gekrümmt laufen.In the present case, the transfer line 50 runs horizontally. In principle, however, it can also run slightly horizontally to the horizontal or slightly curved.

Figur 2 zeigt in schematischer Teildarstellung eine weitere Ausführungsform der Maschine 10, die sich von der der Figur 1 im Wesentlichen durch eine andere Ausgestaltung des Impingement-Trocknungsabschnitts 16 unterscheidet. FIG. 2 shows in a schematic partial view of another embodiment of the machine 10, which differs from that of FIG. 1 essentially differs by another embodiment of the impingement drying section 16.

So ist im vorliegenden Fall das erste Trocknungsband 18 im Bereich des ersten Impingementtrockners 54 über mehrere insbesondere kleinere Stützwalzen 74 und das zweite Trockenband 44 im Bereich zweier weiterer Impingementtrockner 76, 78 jeweils über eine weitere Gruppe von relativ kleineren Stützwalzen 80 bzw. 82 geführt. Dabei ist im Bereich der das erste Trockenband 18 abstützenden relativ kleineren Stützwalzen 74 eine erste, zumindest im Wesentlichen waagerechte Impingement-Strecke und im Bereich des an dem ebenfalls relativ kleineren Stützwalzen 80 und 82 abgestützten zweiten Trockenbandes 14 ein allgemein vertikal nach unten bzw. eine vertikal nach oben führende Impingement-Strecke gebildet.Thus, in the present case, the first drying belt 18 in the region of the first impingement dryer 54 via a plurality of particularly smaller support rollers 74 and the second drying belt 44 in the region of two further impingement dryer 76, 78 each over a further group of relatively smaller support rollers 80 and 82 out. Here, in the area of the first drying belt 18 supporting relatively smaller support rollers 74, a first, at least substantially horizontal impingement path and in the region of the also relatively smaller support rollers 80 and 82 supported second drying belt 14 a generally vertically down or a vertical formed up leading impingement track.

Wie anhand der Figur 2 zu erkennen ist, wird die Faserstoffbahn 46 von dem dem ersten Impingementtrockner 54 zugeordneten ersten Trockenband 18 an das den beiden weiteren Impingementtrocknern 76, 78 zugeordnete zweite und letzte Trockenband 44 übergeben.As based on the FIG. 2 1, the fibrous web 46 is transferred from the first drying belt 18 assigned to the first impingement dryer 54 to the second and last drying belt 44 assigned to the two further impingement dryers 76, 78.

Anhand der Figur 2 ist zudem zu erkennen, dass die zumindest im Wesentlichen vertikalen Impingement-Strecken im Bereich der Stützwalzen 80 bzw. 82 leicht gekrümmt sein können. Entsprechend ergibt sich über diese Strecken eine leicht gekrümmte Bahnführung.Based on FIG. 2 It can also be seen that the at least substantially vertical impingement stretches in the region of the support rollers 80 and 82 can be slightly curved. Accordingly, results over these routes a slightly curved track guide.

Im Anschluss an die Pressenpartie 12 kann die Faserstoffbahn 46 beispielsweise wieder durch ein Sieb 60 von dem Pressband- oder -filz 64 im Bereich einer Saugwalze 56 übernommen werden. Anders als bei der Ausführung gemäß Figur 1 wird im vorliegenden Fall die Faserstoffbahn 46 mit dem Sieb 60 jedoch nicht über eine zumindest im Wesentlichen waagerechte Transferstrecke, sondern kurz nach der Saugwalze 26 an das um eine erste Saugleitwalze 84 geführte Trockenband 18 übergeben, das die Faserstoffbahn 46 im Anschluss an eine weitere, hinter den Stützwalzen 74 vorgesehenen Saugleitwalze 86 an das zweite letzte Trockenband 44 übergibt.Following the press section 12, the fibrous web 46 can, for example, be taken over again by a wire 60 from the press belt or felt 64 in the region of a suction roll 56. Unlike the execution according to FIG. 1 In the present case, however, the fibrous web 46 with the wire 60 is not transferred via an at least substantially horizontal transfer section, but shortly after the suction roller 26 to the guided around a first Saugleitwalze 84 drying belt 18, the fibrous web 46 following another, behind the support rollers 74 provided Saugleitwalze 86 passes to the second last drying belt 44.

Wie anhand der Figur 2 zu erkennen ist, sind die beiden Gruppen von Stützwalzen 80 bzw. 82 zwischen einer oberen Umlenkwalze 88 und einer unteren Umlenkwalze 90 angeordnet, über die das zweite und letzte Trockenband 44 geführt ist. Im Anschluss an die nach oben führende allgemein vertikale, im Bereich der Stützwalzen 82 vorgesehene Impingement-Strecke wird das letzte Trockenband 44 zusammen mit der Faserstoffbahn über die obere Umlenkwalze 18 dem ersten rotierenden Transferelement 40 des Transferbandabschnitts 20 zugeführt.As based on the FIG. 2 can be seen, the two groups of support rollers 80 and 82 between an upper guide roller 88 and a lower guide roller 90 are arranged, over which the second and last drying belt 44 is guided. Following the upward generally vertical impingement path provided in the area of the support rollers 82, the last drying belt 44 is fed together with the fibrous web via the upper deflection roller 18 to the first rotating transfer element 40 of the transfer belt section 20.

Die relativ kleineren Stützwalzen 74, 80, 82 sind insbesondere kleiner als die Trockenzylinder 26 bis 30 und die Leitwalzen 32, 34 der ersten Trockengruppe. Sie können insbesondere auch kleiner als das insbesondere durch einen Zylinder oder eine Walze gebildete erste rotierende Transferelement 40 sein. Jedenfalls sind sie deutlich kleiner als die Stützwalzen 52, 66 der ersten Ausführungsform gemäß Figur 1.The relatively smaller support rollers 74, 80, 82 are in particular smaller than the drying cylinders 26 to 30 and the guide rollers 32, 34 of the first dryer group. In particular, they can also be smaller than the first rotating transfer element 40, in particular formed by a cylinder or a roller. In any case, they are significantly smaller than the support rollers 52, 66 of the first embodiment according to FIG. 1 ,

Die Impingementtrockner 54, 76, 78 können jeweils wieder mit einer Heißluft- und/oder Heißdampfhaube versehen sein.The impingement dryer 54, 76, 78 may each be provided again with a hot air and / or hot steam hood.

Im übrigen besitzt diese Ausführungsform zumindest im Wesentlichen den gleichen Aufbau wie die der Figur 1. Einander entsprechenden Teilen sind gleiche Bezugszeichen zugeordnet.Moreover, this embodiment has at least substantially the same structure as that of FIG. 1 , Corresponding parts are assigned the same reference numerals.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Maschinemachine
1212
Pressenpartiepress section
1414
Trockenpartiedrying section
1616
Impingement-TrocknungsabschnittImpingement drying section
1818
Trockenbanddryband
2020
Transferabschnitttransfer section
2222
erste Trockengruppefirst drying group
2424
Trockensiebdryer
2626
Trockenzylinderdrying cylinders
2828
Trockenzylinderdrying cylinders
3030
Trockenzylinderdrying cylinders
3232
Leitwalzeguide roll
3434
Leitwalzeguide roll
3636
Stabilisatorstabilizer
3838
Stabilisatorstabilizer
4040
erstes rotierendes Transferelementfirst rotating transfer element
4242
Transfersaugwalzetransfer suction
4444
letztes Trockenbandlast drying belt
4646
FaserstoffbahnFibrous web
4848
Pressnippress nip
5050
Transferstrecketransfer route
5252
relativ größere Stüzwalzerelatively larger stump roll
5454
Impingementtrocknerimpingement dryers
5656
Saugwalzesuction roll
5858
Saugwalzesuction roll
6060
Siebscree
6262
Foil- oder VakuumkastenFoil or vacuum box
6464
Pressband oder -filzPress belt or felt
6666
relativ größere Stützwalzerelatively larger support roller
6868
Impingementtrocknerimpingement dryers
7070
Heißluft- und/oder HeißdampfhaubeHot air and / or hot steam hood
7272
Heißluft- und/oder HeißdampfhaubeHot air and / or hot steam hood
7474
relativ kleinere Stützwalzerelatively smaller support roller
7676
Impingementtrocknerimpingement dryers
7878
Impingementtrocknerimpingement dryers
8080
Stützwalzesupporting roll
8282
Stützwalzesupporting roll
8484
Saugleitwalzesuction guide
8686
Saugleitwalzesuction guide
8888
Umlenkwalzedeflecting
9090
Umlenkwalzedeflecting

Claims (28)

  1. Dryer section (14) for a machine (10) for producing and/or treating a fibrous web (46), in particular a paper, board or tissue web, having an impingement drying section (16) comprising one or more dryer belts (18, 44), in which the fibrous web supported on a respective dryer belt (18, 44) has hot air and/or steam applied to it, a transfer section (20) following the impingement drying section (16) in the web running direction (L), and a first dryer group (22) with associated dryer fabric (24) following the transfer section (20) in the web running direction (L), in which group the fibrous web (46), together with the dryer fabric (24), is led around at least one drying cylinder (26-30) and at least one guide roll (32, 34) with associated stabilizer (36, 38), preferably a high-vacuum stabilizer, the fibrous web being transferred from the impingement drying section (16) to the first dryer group (22) by the transfer section (20), the transfer section (20) comprising a first rotating transfer element (40), in particular formed by a cylinder or a roll, and a suction transfer roll (42) spaced apart from the former and wrapped around by the dryer fabric (24) of the first dryer group (22), the fibrous web (46) being fed to the first rotating transfer element (40) together with the preferably mesh-like last dryer belt (44) of the impingement drying section (16), the last dryer belt (44) being led away from the fibrous web (46) and the first rotating transfer element (40) before the fibrous web (46) runs off the first rotating transfer element (40), and the fibrous web (46) being transferred in a free draw from the first rotating transfer element (40) to the suction transfer roll (42) around which the dryer fabric (24) of the first dryer group (22) wraps.
  2. Dryer section according to Claim 1,
    characterized in that
    the impingement drying section (16) comprises only one dryer belt and the last dryer belt is accordingly formed by this single dryer belt.
  3. Dryer section according to Claim 1 or 2,
    characterized in that
    at least the first drying cylinder in the web running direction (L) and/or the first guide roll (32) of the first dryer group (22) is assigned a stabilizer (36, 38) or high-vacuum stabilizer.
  4. Dryer section according to one of the preceding claims,
    characterized in that
    the suction transfer roll (42) can be adjusted in order to change the distance between the latter and the first rotating transfer element (40).
  5. Dryer section according to Claim 4,
    characterized in that
    the suction transfer roll (42) can be pivoted.
  6. Dryer section according to Claim 4 or 5,
    characterized in that
    the suction transfer roll can be adjusted between a transfer or break position, in which it is at a relatively greater distance from the first rotating transfer element (40), and an operating position, in which it is at a relatively smaller distance from the first rotating transfer element (40).
  7. Dryer section according to Claim 6,
    characterized in that
    when the suction transfer roll (42) assumes its transfer or break position, the distance between its surface and the surface of the first rotating transfer element (40) is at least 50 mm and preferably greater than 70 mm.
  8. Dryer section according to Claim 6 or 7,
    characterized in that
    when the suction transfer roll (42) assumes its operating position, the distance between its surface and the surface of the first rotating transfer element (40) is less than 30 mm and preferably less than 10 mm.
  9. Dryer section according to one of the preceding claims,
    characterized in that
    the last dryer belt (44) of the impingement drying section (16) wraps around the first rotating transfer element (40) over a region of less than 190°, preferably less than 160°.
  10. Dryer section according to one of the preceding claims,
    characterized in that
    the first rotating transfer element (40) comprises an in particular steam-heated cylinder.
  11. Dryer section according to one of Claims 1 to 9,
    characterized in that
    the first rotating transfer element (40) comprises a non-heated guide roll.
  12. Dryer section according to one of the preceding claims,
    characterized in that
    the first rotating transfer element (40) is provided with an external coating assisting the removal of the fibrous web (46).
  13. Dryer section according to Claim 12,
    characterized in that
    the external coating consists at least partly of metal carbide-Teflon and/or ceramic.
  14. Dryer section according to one of the preceding claims,
    characterized in that
    the first rotating transfer element (40) is formed by a guide roll having a circumferential surface of porous material.
  15. Dryer section according to one of the preceding claims,
    characterized in that
    it comprises a plurality of dryer groups.
  16. Dryer section according to Claim 15,
    characterized in that
    single-row dryer groups (22) are predominantly provided.
  17. Dryer section according to Claim 16,
    characterized in that
    at least 70% of the drying cylinders (26-30) are arranged in a single row.
  18. Dryer section according to one of the preceding claims,
    characterized in that
    the first dryer group (22) comprises at least two and preferably three drying cylinders (26-30).
  19. Dryer section according to one of the preceding claims,
    characterized in that
    the second dryer group following the first dryer group (22) in the web running direction (L) has at least two and preferably three drying cylinders.
  20. Use of a dryer section according to one of the preceding claims for drying a fibrous web,
    characterized in that
    immediately before the impingement drying section (16) in the web running direction (L), the fibrous web (46) in the case of wood-free paper has a dryness in a range from about 46% to about 58%.
  21. Use of a dryer section according to one of the preceding Claims 1 to 19 for drying a fibrous web,
    characterized in that
    immediately before the impingement drying section (16) in the web running direction (L), the fibrous web (46) in the case of paper containing groundwood has a dryness in a range from about 48% to about 60%.
  22. Use of a dryer section according to one of the preceding Claims 1 to 19 for drying a fibrous web,
    characterized in that
    immediately after the impingement drying section (16) in the web running direction (L), the fibrous web (46) in the case of wood-free paper has a dryness of at least 49%.
  23. Use of a dryer section according to one of the preceding Claims 1 to 19 for drying a fibrous web,
    characterized in that
    immediately after the impingement drying section (16) in the web running direction (L), the fibrous web (46) in the case of paper containing groundwood has a dryness of at least 52%.
  24. Machine (10) for producing and/or treating a fibrous web, in particular a paper, board or tissue web, having a former, a press section (12) and a dryer section (14) according to one of the preceding Claims 1 to 19.
  25. Machine according to Claim 24,
    characterized in that
    in the web running direction (L), the impingement drying section (16) follows the press section (12) without any steam-heated cylinders located in between.
  26. Machine according to Claim 24 or 25,
    characterized in that
    the fibrous web (46) is led through the press section (12) continuously in a closed draw.
  27. Machine according to Claim 26,
    characterized in that
    starting from the former, as viewed in the web running direction (L), the fibrous web (46) is led in a free draw for the first time following the first rotating transfer element (40).
  28. Machine according to one of the first Claims 24 to 27,
    characterized in that
    it is designed for rope-free transfer of the fibrous material (46) in one step with full web width, starting from the former as far as the start of the first dryer group (22).
EP08157399A 2007-06-12 2008-06-02 Dryer section Not-in-force EP2003243B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007026931A DE102007026931A1 (en) 2007-06-12 2007-06-12 drying section

Publications (2)

Publication Number Publication Date
EP2003243A1 EP2003243A1 (en) 2008-12-17
EP2003243B1 true EP2003243B1 (en) 2011-08-17

Family

ID=39743809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08157399A Not-in-force EP2003243B1 (en) 2007-06-12 2008-06-02 Dryer section

Country Status (3)

Country Link
EP (1) EP2003243B1 (en)
AT (1) ATE520821T1 (en)
DE (1) DE102007026931A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT508471B1 (en) 2009-07-15 2012-01-15 Andritz Ag Maschf DEVICE FOR PRODUCING A FIBROUS WEB
DE102021121870A1 (en) 2021-08-24 2023-03-02 Voith Patent Gmbh MACHINE FOR MAKING OR TREATMENT OF A FIBROUS WEB

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19934777A1 (en) 1999-07-23 2001-01-25 Voith Paper Patent Gmbh Dryer section producing or finishing paper, card or tissue web includes detachment region without support, which is provided further away by drying sieve
DE102004037245A1 (en) * 2004-07-31 2006-02-16 Voith Paper Patent Gmbh Apparatus for high speed production of fibrous sheet, especially SC-paper, having two successive double felted shoe presses followed by two other press nips with smoothing properties

Also Published As

Publication number Publication date
EP2003243A1 (en) 2008-12-17
DE102007026931A1 (en) 2008-12-18
ATE520821T1 (en) 2011-09-15

Similar Documents

Publication Publication Date Title
WO2021219272A1 (en) Machine for producing or treating a fibrous web
EP0989232A2 (en) Drying section
EP1072722B1 (en) Dryer section
EP1749927B1 (en) Device for dewatering a fibrous web
EP2003243B1 (en) Dryer section
DE4009287B4 (en) Method and apparatus for drying a wet paper web in a paper machine dryer section
EP1156155B1 (en) Dryer section of a machine for manufacturing a paper or board web
EP1158092B1 (en) Drying section
DE4311351A1 (en)
DE19882441B4 (en) First drying sections of paper-making machines using web support transfer belts - with the belt having good adhesion properties replacing conventional wire draw means and running at higher speeds
DE19602697B4 (en) drying section
EP1739228B1 (en) Machine for manufacturing a fibrous web
EP1819872B1 (en) Drier section
AT16049U1 (en) SIEBPARTIE, PARTICULARLY A MODIFIED SIEBPARTIE
DE19935138A1 (en) 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
WO2020030320A1 (en) Machine and method for producing a raw corrugated board web
WO2020030509A1 (en) Pressing arrangement
DE19944266A1 (en) Paper/cardboard web drying station has the web carried between two blankets in a serpentine path with separation of the outer blanket at the deflection point between drying sections for positive web guidance at high speeds
DE10259379A1 (en) Drying section of a paper or board machine
DE10051649A1 (en) Paper web fed from first press to a second press with an endless belt passing through a higher roller at the same height as second press
AT506986B1 (en) METHOD RELATED TO A PAPER MACHINE AND A PAPER MACHINE
DE102009000507A1 (en) Device for producing a material web
DE102021113491A1 (en) Forming section of a fiber web production line
DE102005026312A1 (en) Impingement drying arrangement
DE102015121002B4 (en) Fiber web machine equipped with a smoothing cylinder

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

17P Request for examination filed

Effective date: 20090617

17Q First examination report despatched

Effective date: 20090720

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502008004516

Country of ref document: DE

Effective date: 20111020

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20110817

LTIE Lt: invalidation of european patent or patent extension

Effective date: 20110817

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111217

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111219

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111117

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111118

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

26N No opposition filed

Effective date: 20120521

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120321

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502008004516

Country of ref document: DE

Effective date: 20120521

BERE Be: lapsed

Owner name: VOITH PATENT G.M.B.H.

Effective date: 20120630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120630

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20120602

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120602

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20130228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120630

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120702

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120630

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120630

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120602

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111128

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111117

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20130620

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20130613

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110817

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120602

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080602

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 520821

Country of ref document: AT

Kind code of ref document: T

Effective date: 20130602

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130602

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502008004516

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140602

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502008004516

Country of ref document: DE

Effective date: 20150101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150101