EP2126202B1 - Procédé d'égouttage de pâte de cellulose et installation d'égouttage pour la réalisation du procédé - Google Patents

Procédé d'égouttage de pâte de cellulose et installation d'égouttage pour la réalisation du procédé Download PDF

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Publication number
EP2126202B1
EP2126202B1 EP08701485.8A EP08701485A EP2126202B1 EP 2126202 B1 EP2126202 B1 EP 2126202B1 EP 08701485 A EP08701485 A EP 08701485A EP 2126202 B1 EP2126202 B1 EP 2126202B1
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EP
European Patent Office
Prior art keywords
wire
pulp
dewatering
roll
wires
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
EP08701485.8A
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German (de)
English (en)
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EP2126202A1 (fr
Inventor
Günther Mohrhardt
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
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Voith Patent GmbH
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Publication date
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Publication of EP2126202A1 publication Critical patent/EP2126202A1/fr
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Publication of EP2126202B1 publication Critical patent/EP2126202B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/80—Pulp catching, de-watering, or recovering; Re-use of pulp-water using endless screening belts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention relates to a method for dewatering pulp in a former, in which the pulp applied to a lower wire by a headbox is passed between the lower wire and an upper wire by means of a guide roller at least in sections forming a twin-wire zone.
  • the invention relates to a dewatering machine for pulp, comprising a former with a lower sieve and an upper sieve, which at least partially form a twin-wire zone and are guided with the lying between them, applied by a headbox on the lower wire pulp over a guide roller.
  • the dewatering machine is particularly suitable for carrying out the method.
  • Such a dewatering machine is for example from the International Application WO 00/31336 A1 known.
  • the relatively short twin-wire zone of this dewatering machine is preceded by a wedge-shaped converging space formed by the two screens into which a headbox introduces the pulp at a first dry content.
  • the two sieves passing through the room are held on chamber units, each containing at least one white water receiving chamber.
  • the dewatering machine shown in Figure 2 of said document has the disadvantage that they only limited with a limited due to the respective limited drainage capacity of the chamber units Production speed, that is, Sieb beau can be operated. This is usually in a range of up to 200 m / min. Due to the reduced production speed of the dewatering machine also their production amount is also correspondingly low in a conventional machine width.
  • the documents DE3414087 A1 . WO97 / 42374 and DE 3343941 A1 describe drainage devices for dewatering fibrous webs.
  • the pulp suspension applied to a sieve by means of a headbox is partially dewatered in a first section through the sieve.
  • a twin-wire section with a second wire is provided in which the pulp suspension and the already partially formed pulp partial web are dewatered through the second wire.
  • This object is achieved according to the invention in a method of the type mentioned above in that the pulp in a pre-dewatering zone upstream of the twin wire zone in the direction of the wire sieve of the lower wire the lower sieve is pre-dewatered and that the pulp is further dewatered in the double-wire zone having a further deflection roller by means of wire strains applied by the two sieves.
  • the process according to the invention makes it possible to achieve higher dry contents of the pulp due to improved, ie intensified dewatering of the pulp even at higher wire speeds.
  • the intensification of the drainage takes place on the one hand by their division into different phases, on the other hand by the type of drainage.
  • a drainage due to applied screen stresses among other things, also much gentler than a drainage due to the introduction of pressure pulses, they are now mechanical or pneumatic.
  • a greater amount of pulp can be produced with improved dry contents and improved properties.
  • the lower sieve for further dewatering of the pulp a lower wire tension of at least 20 kN / m, preferably at least 25 kN / m, in particular at least 30 kN / m yields
  • the upper sieve for further dewatering of the pulp an upper wire tension of at least 6 kN / m, preferably of at least 8 kN / m, in particular of at least 10 kN / m yields.
  • a pulp having a basis weight of 600 to 1200 g / m 2 and / or a consistency of 1.2 to 2.2% also preferably at a screen speed of at least 200 m / min, preferably of at least 250 m / min, in particular of at least 300 m / min, drained.
  • the pulp is dehydrated in the region of the pre-dewatering zone with a vacuum of less than or equal to 0.1 bar, preferably less than or equal to 0.8 bar.
  • the vacuum requirement to be installed is noticeably reduced.
  • the object of the invention is achieved in a dewatering machine of the type mentioned in that the Doppelsiebzone upstream in the wire running direction of the lower wire is formed from a portion of the lower sieve Vorent camess mecanicszone that the guide roller has a closed roll shell and provided on the outside with a catcher for thrown off white water is and that the guide roller in Sieblaufraum of the lower wire another, both screens leading guide roller having a closed roll shell and is provided on the underside with a catcher for thrown off white water downstream.
  • the use of the inventive method of "energy-consuming" drainage elements largely, preferably even completely omitted.
  • the required drive power is reduced by about 25% and the vacuum requirement to be installed by about 40%.
  • the two deflection rollers preferably each have a roll diameter in the range from 1,200 to 1,750 mm, preferably from 1,450 to 1,600 mm.
  • the two wires preferably wrap around the first deflection roller with a first wrap angle in a range from 90 to 135 °, preferably from 110 to 125 °. This in turn increases the drainage length and thus the dry contents of the pulp with an extremely gentle dewatering.
  • the predewatering zone formed from a section of the lower screen may preferably be oriented horizontally or approximately horizontally.
  • the dewatering behavior of the pulp can be relatively easily influenced and controlled in such an embodiment.
  • the two wires preferably run in the lower half of the roll from the first guide roller. They run in a favorable manner - seen in the direction Sieblaufraum the lower sieve - in the first lower quadrant of the first guide roller and in the upper half of the roller on the second guide roller.
  • the second guide roller preferably with a second wrap in a range of 125 to 180 °, preferably from 145 to 165 ° wrap around. This again increases the drainage length and thus the dry contents of the pulp with an extremely gentle dewatering.
  • the two screens preferably run in the lower half of the roller from the second guide roller. They run in a favorable manner - seen in Sieblaufraum of the lower sieve - in the first lower quadrant of the second guide roller preferably together. This again favors the achievement of the shortest possible dewatering machine and the avoidance of rewetting of the pulp.
  • the lower wire preferably has a lower wire tension of at least 20 kN / m, preferably of at least 25 kN / m, in particular of at least 30 kN / m
  • the upper wire preferably has an upper wire tension of at least 6 kN / m, preferably at least 8 kN / m, in particular at least 10 kN / m.
  • the single figure shows a schematic side view of an embodiment of a dewatering machine 1 according to the invention for pulp 2, which comprises a former 3.
  • the former 3 has a lower sieve 4 and an upper sieve 5, which at least partially form a double-wire zone 6.
  • the pulp 2 lying between them applied by a merely indicated headbox 7 to the lower sieve 4, is guided over a deflecting roller 8.
  • the twin-wire zone 6 is preceded by a pre-dewatering zone 9 formed from a section of the lower wire 4 in the wire-running direction S (arrow) of the lower wire 4.
  • This horizontally or approximately horizontally oriented pre-dewatering zone 9 has a length L.9 in the range of 5,000 to 8,000 mm and is provided on the underside, ie the lower sieve 4 and the pulp 2 lying thereon, with several known dewatering elements. These dewatering elements are provided with the reference numeral 10 and each generate a vacuum V.10 less than or equal to 0.1 bar, preferably less than or equal to 0.8 bar.
  • the lower sieve 4 is guided before its entry into the pre-dewatering zone 9 around a breast roll 11, in the area of which the headbox 7 applies the pulp 2 to the same.
  • the guide roller 8 has a closed roller shell M.8 and is provided on the outside with a collecting device 12 for centrifuged white water (arrows).
  • the collecting device 12 extends to an extent that all due to the action of centrifugal thrown off white water (arrows) is fully collected and can be reliably removed from the former 3, for example by means not shown, the expert but known white water gutter.
  • the guide roller 8 has a roller diameter D.8 in the range of 1,200 to 1,750 mm, preferably from 1,450 to 1,600 mm, and is of the two wires 4, 5 with a first wrap angle A.8 in a range from 90 to 135 °, preferably from 110 to 125 °, looped.
  • the deflection roller 8 is in Sieblaufraum S (arrow) of the lower sieve 4 another, both sieves 4, 5 leading guide roller 13, which in turn has a closed roll shell M.13 and bottom side with a collecting device 14 for thrown off white water (arrows), downstream.
  • This collecting device 14 extends to an extent that all due to the action of centrifugal centrifugal force thrown off white water (arrows) is fully collected and can be reliably removed from the former 3, for example by means not shown, the expert but well known white water gutter.
  • the guide roller 13 has a roller diameter D.13 in the range of 1,200 to 1,750 mm, preferably from 1,450 to 1,600 mm.
  • the two wires 4, 5 run in the upper half of the roll on the second guide roller 13 and wrap around it with a second wrap angle A.13 in a range of 125 to 180 °, preferably from 145 to 165 °.
  • the two wires 4, 5 in the lower half of the roll, preferably in the first lower quadrant Q.13 preferably run together from the second deflection roll 13.
  • the two sieves 4, 5 are guided over a separating sucker 15, in the area of which they are separated on the basis of the present geometry, and the twin-wire zone 6 is thus terminated.
  • the pulp 2 is carried on the lower wire 4 after the separation of the two wires 4, 5 and transferred at a later time in a known manner in a press section of the dewatering machine 1, not shown.
  • the lower wire 4 has a lower wire tension T.4 (double arrow) of at least 20 kN / m, preferably of at least 25 kN / m, in particular of at least 30 kN / m, whereas the upper wire 5 has an upper wire tension T.5 (double arrow) of at least 6 kN / m, preferably of at least 8 kN / m, in particular of at least 10 kN / m.
  • the device 1 described in the single figure is particularly suitable for carrying out the method according to the invention for dewatering pulp 2 in a former 3, in which the pulp 2 applied from a headbox 7 to a lower wire 4 between the lower wire 4 and an upper sieve 5 is guided at least in sections forming a twin-wire zone 6 via a guide roller 8, wherein the pulp 2 is pre-dewatered by means of the lower sieve 4 in a pre-dewatering zone 9 upstream of the twin sieve zone 6 (arrow) of the lower sieve 4, and wherein Pulp 2 in which a further deflection roller 13 having double-wire zone 6 by means of the two screens 4, 5 applied screen stresses T.4 (double arrow), T.5 (double arrow) is further dewatered.
  • the pulp 2 which preferably has a basis weight F of 600 to 1200 g / m 2 and / or a consistency K of 1.2 to 2.2%, can thus be at a screen speed v (arrow) of at least 200 m / min , preferably of at least 250 m / min, in particular of at least 300 m / min, dehydrate.
  • the invention improves both a method and a dewatering machine of the aforementioned types such that the disadvantages of the prior art are overcome and that higher dry contents of the pulp can be achieved efficiently and inexpensively.

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  • Paper (AREA)

Claims (13)

  1. Procédé d'égouttage de pâte de cellulose (2) dans une section de formage (3), dans lequel la pâte de cellulose (2) déposée par une caisse de tête (7) sur une toile inférieure (4) est guidée entre la toile inférieure (4) et une toile supérieure (5) avec formation au moins intermittente d'une zone à double toile (6) sur un rouleau de déviation (8),
    dans lequel la pâte de cellulose (2) est pré-égouttée au moyen de la toile inférieure (4) dans une zone de pré-égouttage (9) disposée en amont de la zone à double toile (6) dans la direction de défilement de toile (S) de la toile inférieure (4) et
    dans lequel la pâte de cellulose (2) est encore égouttée dans la zone à double toile (6) présentant un autre rouleau de déviation (13) au moyen de tensions de toile (T.4, T.5) appliquées par les deux toiles (4, 5), caractérisé en ce que la toile inférieure (4) produit, pour l'égouttage ultérieur de la pâte de cellulose (2), une tension de toile inférieure (T.4) d'au moins 20 kN/m, de préférence d'au moins 25 kN/m, de préférence encore d'au moins 30 kN/m et en ce que la toile supérieure (5) produit, pour l'égouttage ultérieur de la pâte de cellulose (2), une tension de toile supérieure (T.5) d'au moins 6 kN/m, de préférence d'au moins 8 kN/m, et en particulier d'au moins 10 kN/m.
  2. Procédé selon la revendication 1, caractérisé en ce que la pâte de cellulose (2) présentant un poids par unité de surface (F) de 600 à 1200 g/m2 et/ou une consistance (K) de 1,2 à 2,2 % est égouttée à une vitesse de toile (v) d'au moins 200 m/min, de préférence d'au moins 250 m/min, et en particulier d'au moins 300 m/min.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la pâte de cellulose (2) est égouttée dans la région de la zone de pré-égouttage (9) avec un vide (V.10) inférieur ou égal à 0,1 bar, de préférence inférieur ou égal à 0,8 bar.
  4. Installation d'égouttage (1) pour la pâte de cellulose (2), comprenant une section de formage (3) avec une toile inférieure (4) et une toile supérieure (5), qui forment au moins par intermittence une zone à double toile (6) et qui sont en l'occurrence guidées avec la pâte de cellulose (2) disposée entre elles et déposée par une caisse de tête (7) sur la toile inférieure (4) sur un rouleau de déviation (8),
    dans laquelle une zone de pré-égouttage (9) formée par une partie de la toile inférieure (4) est disposée en amont de la zone à double toile (6) dans la direction de défilement de toile (S) de la toile inférieure (4), dans laquelle le rouleau de déviation (8) présente une surface latérale fermée (M.8) et est muni du côté extérieur d'un dispositif de capture (12) pour l'eau d'égouttage centrifugée, et
    dans laquelle un autre rouleau de déviation (13) guidant les deux toiles (4, 5), qui présente une surface latérale fermée (M.13) et qui est muni du côté inférieur d'un dispositif de capture (14) pour l'eau d'égouttage centrifugée, est disposé en aval du rouleau de déviation (8) dans la direction de défilement de toile (S) de la toile inférieure (4),
    caractérisée en ce que la toile inférieure (4) présente une tension de toile inférieure (T.4) d'au moins 20 kN/m, de préférence d'au moins 25 kN/m, et en particulier d'au moins 30 kN/m, et en ce que la toile supérieure (5) présente une tension de toile supérieure (T.5) d'au moins 6 kN/m.
  5. Machine d'égouttage (1) selon la revendication 4, caractérisée en ce que les deux rouleaux de déviation (8, 13) présentent respectivement un diamètre de rouleau (D.8, D.13) compris dans la plage de 1200 à 1750 mm, de préférence de 1450 à 1600 mm.
  6. Machine d'égouttage (1) selon la revendication 4 ou 5, caractérisée en ce que les deux toiles (4, 5) embrassent le premier rouleau de déviation (8) avec un premier angle de contact (A.8) compris dans une plage de 90 à 135°, de préférence de 110 à 125°.
  7. Machine d'égouttage (1) selon l'une quelconque des revendications 4 à 6, caractérisée en ce que les deux toiles (4, 5) se déplacent dans la moitié de rouleau inférieure du premier rouleau de déviation (8).
  8. Machine d'égouttage (1) selon la revendication 7, caractérisée en ce que les deux toiles (4, 5) - vues dans la direction de défilement de toile (S) de la toile inférieure (4) - se déplacent dans le premier quadrant inférieur (Q.8) du premier rouleau de déviation (8).
  9. Machine d'égouttage (1) selon l'une quelconque des revendications 4 à 8, caractérisée en ce que les deux toiles (4, 5) se déplacent dans la moitié de rouleau supérieure sur le deuxième rouleau de déviation (13).
  10. Machine d'égouttage (1) selon l'une quelconque des revendications 4 à 9, caractérisée en ce que les deux toiles (4, 5) embrassent le deuxième rouleau de déviation (13) avec un deuxième angle de contact (A.13) compris dans une plage de 125 à 180°, de préférence de 145 à 165°.
  11. Machine d'égouttage (1) selon l'une quelconque des revendications 4 à 10, caractérisée en ce que les deux toiles (4, 5) se déplacent dans la moitié de rouleau inférieure du deuxième rouleau de déviation (13).
  12. Machine d'égouttage (1) selon l'une quelconque des revendications 4 à 11, caractérisée en ce que les deux toiles (4, 5) - vues dans la direction de défilement de toile (S) de la toile inférieure (4) - se déplacent de préférence de concert dans le premier quadrant inférieur (Q.13) du deuxième rouleau de déviation (13).
  13. Machine d'égouttage (1) selon l'une quelconque des revendications 4 à 12, caractérisée en ce que la toile supérieure (5) présente une tension de toile supérieure (T.5) d'au moins 8 kN/m, de préférence d'au moins 10 kN/m, et en particulier d'au moins 12 kN/m.
EP08701485.8A 2007-01-25 2008-01-15 Procédé d'égouttage de pâte de cellulose et installation d'égouttage pour la réalisation du procédé Not-in-force EP2126202B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710000036 DE102007000036A1 (de) 2007-01-25 2007-01-25 Verfahren zum Entwässern von Zellstoff und Entwässerungsmaschine zur Durchführung des Verfahrens
PCT/EP2008/050375 WO2008090052A1 (fr) 2007-01-25 2008-01-15 Procédé d'égouttage de pâte de cellulose et installation d'égouttage pour la réalisation du procédé

Publications (2)

Publication Number Publication Date
EP2126202A1 EP2126202A1 (fr) 2009-12-02
EP2126202B1 true EP2126202B1 (fr) 2015-10-07

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Application Number Title Priority Date Filing Date
EP08701485.8A Not-in-force EP2126202B1 (fr) 2007-01-25 2008-01-15 Procédé d'égouttage de pâte de cellulose et installation d'égouttage pour la réalisation du procédé

Country Status (4)

Country Link
EP (1) EP2126202B1 (fr)
CN (1) CN101589194B (fr)
DE (1) DE102007000036A1 (fr)
WO (1) WO2008090052A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2447218C2 (ru) * 2010-06-16 2012-04-10 Анатолий Кузьмич Соломаха Компактное устройство для производства санитарно-гигиенических видов бумаги
DE102010041730A1 (de) 2010-09-30 2012-04-05 Voith Patent Gmbh Maschine für die Entwässerung von Zellstoff
DE102011003304A1 (de) 2011-01-28 2012-08-02 Voith Patent Gmbh Zellstoffentwässerungsbespannung für eine Zellstoffentwässerungsmaschine
DE102012204936A1 (de) 2012-03-28 2013-10-02 Voith Patent Gmbh Verfahren zum Entwässern von Zellstoff und Entwässerungsmaschine zur Durchführung des Verfahrens
WO2013143713A1 (fr) * 2012-03-28 2013-10-03 Voith Patent Gmbh Machine destiné au séchage de la cellulose

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
AT376722B (de) * 1983-02-09 1984-12-27 Andritz Ag Maschf Entwaesserungsmaschine fuer zellstoff od. dgl. fasermaterial
FI831275L (fi) * 1983-04-15 1984-10-16 Rauma Repola Oy Foerfarande och anordning foer avlaegsning av vaetska ur fibermassa.
IT1283761B1 (it) * 1996-04-22 1998-04-30 Sernagiotto Spa Pressa a doppio nastro ad elevata capacita' di disidratazione
US5783045A (en) * 1996-05-06 1998-07-21 Beloit Technologies, Inc. Pulp and linerboard former with improved dewatering
CN2272028Y (zh) * 1996-08-01 1998-01-07 四川省资中县轻工机械厂 双网压滤真空洗浆机
FI982540A7 (fi) 1998-11-24 2000-05-25 Metso Paper Inc Laitteisto ja menetelmä sellun kuivaamiseksi
CN2394944Y (zh) * 1999-09-21 2000-09-06 李保民 长网双辊挤浆机
DE19950805A1 (de) * 1999-10-21 2001-04-26 Voith Paper Patent Gmbh Former
CN2557570Y (zh) * 2002-07-07 2003-06-25 李风宁 一种夹网成形器

Also Published As

Publication number Publication date
WO2008090052A1 (fr) 2008-07-31
BRPI0806085A2 (pt) 2011-08-30
CN101589194B (zh) 2013-04-24
EP2126202A1 (fr) 2009-12-02
CN101589194A (zh) 2009-11-25
DE102007000036A1 (de) 2008-07-31

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