EP2003243A1 - Partie sèche - Google Patents

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Publication number
EP2003243A1
EP2003243A1 EP08157399A EP08157399A EP2003243A1 EP 2003243 A1 EP2003243 A1 EP 2003243A1 EP 08157399 A EP08157399 A EP 08157399A EP 08157399 A EP08157399 A EP 08157399A EP 2003243 A1 EP2003243 A1 EP 2003243A1
Authority
EP
European Patent Office
Prior art keywords
drying
drying section
web
fibrous web
dryer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08157399A
Other languages
German (de)
English (en)
Other versions
EP2003243B1 (fr
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/fr
Application granted granted Critical
Publication of EP2003243B1 publication Critical patent/EP2003243B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 of 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 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, wherein the fibrous web is transferred via the transfer section from the impingement drying section to the first dryer section. 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, the fibrous web together with the last drying belt preferably having a 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 the surface thereof and the surface of the first rotating transfer element preferably amounts to at least 50 mm at its transfer or tear-off position of the transfer transfer roll, 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.

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  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
EP08157399A 2007-06-12 2008-06-02 Partie sèche Not-in-force EP2003243B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007026931A DE102007026931A1 (de) 2007-06-12 2007-06-12 Trockenpartie

Publications (2)

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

Family

ID=39743809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08157399A Not-in-force EP2003243B1 (fr) 2007-06-12 2008-06-02 Partie sèche

Country Status (3)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT508471B1 (de) 2009-07-15 2012-01-15 Andritz Ag Maschf Vorrichtung zur herstellung einer faserstoffbahn
DE102021121870A1 (de) 2021-08-24 2023-03-02 Voith Patent Gmbh Maschine zur herstellung oder behandlung einer faserstoffbahn

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19934777A1 (de) 1999-07-23 2001-01-25 Voith Paper Patent Gmbh Trockenpartie
DE102004037245A1 (de) * 2004-07-31 2006-02-16 Voith Paper Patent Gmbh Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19934777A1 (de) 1999-07-23 2001-01-25 Voith Paper Patent Gmbh Trockenpartie
DE102004037245A1 (de) * 2004-07-31 2006-02-16 Voith Paper Patent Gmbh Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn

Also Published As

Publication number Publication date
ATE520821T1 (de) 2011-09-15
EP2003243B1 (fr) 2011-08-17
DE102007026931A1 (de) 2008-12-18

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