EP1777340B1 - Agencement de presse - Google Patents

Agencement de presse Download PDF

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Publication number
EP1777340B1
EP1777340B1 EP06121946A EP06121946A EP1777340B1 EP 1777340 B1 EP1777340 B1 EP 1777340B1 EP 06121946 A EP06121946 A EP 06121946A EP 06121946 A EP06121946 A EP 06121946A EP 1777340 B1 EP1777340 B1 EP 1777340B1
Authority
EP
European Patent Office
Prior art keywords
arrangement according
fibrous web
press
roll
press arrangement
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
EP06121946A
Other languages
German (de)
English (en)
Other versions
EP1777340A1 (fr
Inventor
Daniel Gronych
Helmut Sterz
Robert Koplin
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 EP1777340A1 publication Critical patent/EP1777340A1/fr
Application granted granted Critical
Publication of EP1777340B1 publication Critical patent/EP1777340B1/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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof

Definitions

  • the invention relates to a pressing arrangement according to the preamble of claim 1.
  • a pressing arrangement is known from EP-A-1 316 641 known..
  • Multi-press nip press assemblies are known, for example, in compact form with a central roll involved in multiple press nips.
  • the object of the invention is therefore to reduce the roughness and roughness two-sidedness of the fibrous web and, if possible, also to improve the web guide.
  • the opposite, smooth contact surfaces of the smoothing roller and the transfer belt provide for a relatively equilateral smoothing of the fibrous web and thus for a reduction of the roughness and the Rauhtechnikszwei supramony.
  • the number of water-absorbing drainage tapes is sufficient and the inventive arrangement with two dewatering belts on both sides of the fibrous web provides for an approximately symmetrical drainage.
  • the fibrous web should as far as possible be supported in the entire area of the pressing arrangement, preferably of at least one band or one roller. This is particularly important because of the high moisture content and thus the relatively low strength of the fibrous web in this area of importance.
  • the dewatering belt of the second press nip should take over the fibrous web from the opposite with respect to the fibrous web dewatering belt of the first press nip and the fibrous web after the second press nip of transfer preferably under the fibrous web transfer belt to an air-permeable transfer belt.
  • the transfer belt should wrap around an evacuated guide roll during the takeover of the fibrous web.
  • the negative pressure of this guide roller sucks the fibrous web to the transfer belt and increases the adhesion to this.
  • the dewatering belt of the third press nip should take over the fibrous web from the transfer belt. It is advantageous if the Dewatering belt takes over the fibrous web in the evacuated wrap area of the evacuated press roll.
  • the negative pressure of the evacuated pressure roller ensures the suction of the fibrous web to the acquiring dewatering belt.
  • the fibrous web can then be transferred from the dewatering belt of the third press nip to an air-permeable belt of a following machine unit, preferably a dryer group.
  • the first and / or the second press nip preferably both press nips should be made extended.
  • the extended press nip can be formed by a preferably arranged above the fibrous web shoe press roll and a cylindrical counter roll.
  • the smoothing roll should have a coating, preferably of ceramic.
  • the delivery of the fibrous web from the smoothing roll to the dewatering belt can also be assisted by the diameter of the smoothing roll being smaller than or equal to the diameter of the evacuated press roll.
  • the evacuated press roll should have several, preferably in the web running direction one behind the other have lying suction zones. An adaptation is so easy on the extent, the location and the different degrees of suction of the zones possible.
  • the evacuated press roll in the region of the press nip has a high vacuum zone, which preferably also extends in the web running direction beyond.
  • the increased negative pressure ensures a water removal of the water pressed out of the fibrous web and for a strong adhesion of the fibrous web to the dewatering belt, so that the fibrous web, in particular after the press nip, reliably releases from the smooth lateral surface of the smoothing roll.
  • the negative pressure in the high vacuum zone should be between 10 and 60 kPa.
  • the negative pressure in the suction area of the evacuated press roll outside the high vacuum zone should be below 30 kPa.
  • This negative pressure is sufficient to ensure the acquisition and the maintenance of the fibrous web on the dewatering belt to the third press nip in sufficient form.
  • the vacuum can suck the water thrown off the dewatering belt into the press roller. Therefore, the suction area of the evacuated press roll should extend beyond the wrap area of the drainage tape in the web running direction.
  • the thrown off water can alternatively or additionally be collected by a gully.
  • the transfer belt should have a hardness of not more than 80, preferably not more than 50 P & J.
  • the roughness Rz of the transfer belt should be between 5 and 50 microns.
  • the transfer belt In order not to impair the fibrous web surface, the transfer belt should be designed as a markarmarmes, still permeable, non-rewet, preferably as a dryer.
  • the vacuumed press roller is driven speed-controlled. This allows the creation of a turn.
  • the guide roller of the transfer belt should also preferably be speed-controlled to be able to produce a synchronization with the evacuated press roll.
  • the smoothing roller is also driven. This should be done momentary in normal operation.
  • the third press nip should be opened during the transfer of the fibrous web. It is advantageous if the smoothing roller is preferably driven speed-controlled in preparation for the closing of the press nip.
  • the fibrous web 1 is transferred from a forming wire 2 of a former upstream of the press assembly for forming the paper machine to an upper water-absorbing dewatering belt 3 of a first press nip of the press assembly. This transfer is supported by a looped by the dewatering belt 3, suctioned guide roll.
  • This dewatering belt 3 leads the fibrous web 1 together with a lower water-absorbing dewatering belt 4 through the first press nip.
  • the fibrous web 1 is still passed together via a transfer line from both dewatering belts 3,4, before the upper dewatering belt 3 is led away from the fibrous web 1.
  • the lower dewatering belt 4 then transfers the fibrous web 1 to an upper, water-absorbing dewatering belt 5 of a second press nip. Through this second press nip, the fibrous web 1 runs together with a lower smooth transfer belt. 6
  • Both press gaps are elongated and are formed by an upper shoe press roll 11,13 and a lower cylindrical counter roll 10,12.
  • the shoe press rolls 11, 13 have a flexible roll shell, which is pressed by a pressing element with a concave pressing surface to the respective counter roll 10, 12.
  • the resulting, extended press nip allows for gentle, yet intensive dewatering.
  • the upper dewatering belt 5 is led away from the fibrous web 1. This is not a problem since the fibrous web 1 adheres much more to the smooth transfer belt 6 than to the opposite dewatering belt 5.
  • the fibrous web is transferred after an air-permeable transfer belt 7 in the form of a low-mark drying fabric.
  • This transfer is supported by a, coiled by the transfer belt 7 and sucked guide roller 14 by the negative pressure of this guide roller 14 sucks the fibrous web 1 to the transfer belt 7.
  • This transfer belt 7 leads the fibrous web 1 to a further, lower, water-absorbing dewatering belt 8 of a third press nip.
  • This third press nip is formed by a press roll 16 looped around the dewatering belt 8 and an upper smoothing roll 15. In this case, the transfer of the fibrous web 1 takes place while the dewatering belt 8 wraps around the evacuated press roll 16.
  • the dewatering belt 8 transfers the fibrous web 1 to an air-permeable belt 9 in the form of a dryer wire of a following drying group of a dryer section of the machine, which is supported by a suctioned, coiled guide roller 17.
  • the fibrous web 1 is guided for drying over heated drying cylinders 18, wherein the drying wire presses the fibrous web 1 against its lateral surface.
  • the fibrous web 1 is constantly supported by a belt within the press assembly, so that the web guide becomes much more stable and secure, allowing much higher machine speeds.
  • each side of the fibrous web 1 comes in contact with as many (two) relatively rough dewatering bands 3,4,5,8, which reduces the roughness two-sidedness.
  • the drainage bands 3, 4, 5, 7, 8 of the press arrangement are not only water-absorbent, but also permeable to air and designed as press felt.
  • the air permeability allows the support of the railway transfer by suctioned guide rollers 14th
  • the transfer belt 6 should have not only a smooth contact surface with respect to the fibrous web 1, but also a hardness of about 50 P & J. This ensures a sufficient load capacity.
  • the roughness Rz of the transfer belt 6 should be between 5 and 50 micrometers.
  • the dewatering belt 8 of the third press nip should not only be water-absorbent and air-permeable, but also as smooth as possible. This supports the smoothing of the fibrous web 1 in the third press nip and increases the adhesion of the fibrous web 1 to the dewatering belt 8.
  • the dewatering belt should have 8 fibers with at most 11 dtex or a coating with polymers or an increased number of hot melt adhesive fibers on the contact side to the fibrous web 1.
  • blowing device 20 in the gusset of the outgoing press nip, which directs blowing air in particular between the smoothing roll 15 and the fibrous web 1 when transferring.
  • This smoothing roll 15 is provided to ensure sufficient smoothness with a ceramic coating.
  • the evacuated press roll 16 has a plurality of suction zones 21, 22, 23, 24 arranged one behind the other in the web running direction 19.
  • All other suction zones 22, 23, 24 have a negative pressure of less than 30 kPa.
  • the holding zone 22 should only guide the fibrous web 1 safely to the press nip.
  • a post-zone 24 adjoins, which is intended to suck in the water thrown off this after the removal of the dewatering belt 8.
  • a Wasserrrine 25 between the evacuated pressure roller 16 and the draining drainage belt eighth
  • the smoothing roller 15 is lifted and driven speed controlled during this time. This facilitates the subsequent closing of the press nip with the likewise speed-driven, sucked press roller 16.
  • this guide roller 14 is driven speed controlled.
  • This press arrangement not only reduces the two-sidedness of the fibrous web 1 but also enables higher dry contents to be achieved at very high machine speeds.

Landscapes

  • Paper (AREA)
  • Glass Compositions (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Press Drives And Press Lines (AREA)
  • Drying Of Solid Materials (AREA)

Claims (25)

  1. Agencement de presse pour égoutter une nappe de papier, carton ou une autre nappe fibreuse (1) dans une machine de fabrication et/ou d'amélioration de cette nappe, comprenant au moins trois fentes de presse, la nappe fibreuse (1) étant guidée à travers la première fente de presse conjointement avec, de part et d'autre, à chaque fois une bande d'égouttage (3, 4) recevant l'eau et à travers la deuxième fente de presse, conjointement avec une bande d'égouttage (5) recevant l'eau et une bande de transfert lisse opposée (6), la troisième fente de presse étant formée par un rouleau de presse (16) entouré par une bande d'égouttage (8) recevant l'eau et par un rouleau de lissage (15) venant en contact avec la nappe fibreuse (1), et le rouleau de lissage (15) étant disposé sur le côté de la nappe fibreuse (1) opposé à la bande de transfert (6), caractérisé en ce que le rouleau de presse (16) est aspiré, et en ce que le rouleau de lissage (15) est entraîné et le rouleau de presse aspiré (16) est entraîné avec une commande de la vitesse de rotation.
  2. Agencement de presse selon la revendication 1, caractérisé en ce que
    la bande d'égouttage (5) de la deuxième fente de presse reprend la nappe fibreuse (1) depuis la bande d'égouttage (4) opposée, par rapport à la nappe fibreuse (1), de la première fente de presse.
  3. Agencement de presse selon la revendication 1 ou 2, caractérisé en ce que
    la nappe fibreuse (1) est transférée après la deuxième fente de presse, de la bande de transfert (6) passant de préférence sous la nappe fibreuse (1) à une bande de transfert (7) perméable à l'air.
  4. Agencement de presse selon la revendication 3, caractérisé en ce que
    la bande de transfert (7) entoure un rouleau directeur aspiré (14) pendant la reprise de la nappe fibreuse (1).
  5. Agencement de presse selon la revendication 3 ou 4, caractérisé en ce que
    la bande d'égouttage (8) de la troisième fente de presse reprend la nappe fibreuse (1) de la bande de transfert (7).
  6. Agencement de presse selon la revendication 5, caractérisé en ce que la bande d'égouttage (8) reprend la nappe fibreuse (1) dans la région d'enveloppement aspirée du rouleau de presse aspiré (16).
  7. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que la nappe fibreuse (1) est transférée de la bande d'égouttage (8) de la troisième fente de presse à une bande perméable à l'air (9) d'une unité de machine suivante, de préférence d'un groupe de séchage.
  8. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que la première fente de presse est réalisée sous forme prolongée.
  9. Agencement de presse selon la revendication 8, caractérisé en ce que
    la première fente de presse est formée par un rouleau de presse à sabot (11) disposé de préférence au-dessus de la nappe fibreuse (1) et par un rouleau conjugué cylindrique (10).
  10. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que la deuxième fente de presse est réalisée sous forme prolongée.
  11. Agencement de presse selon la revendication 10, caractérisé en ce que
    la deuxième fente de presse est formée par un rouleau de presse à sabot (13) disposé de préférence au-dessus de la nappe fibreuse (1) et par un rouleau conjugué cylindrique (12).
  12. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que le rouleau de lissage (15) présente un revêtement, de préférence en céramique.
  13. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que le diamètre du rouleau de lissage (15) est inférieur ou égal au diamètre du rouleau de presse aspiré (16).
  14. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que le rouleau de presse aspiré (16) présente plusieurs zones d'aspiration (21, 22, 23, 24) disposées les unes derrière les autres dans la direction d'avance de la nappe.
  15. Agencement de presse selon la revendication 14, caractérisé en ce que
    le rouleau de presse aspiré (16) possède, dans la région de la fente de presse, une zone de vide poussé (21) qui s'étend de préférence également dans la direction d'avance de la nappe (19), au-delà de celle-ci.
  16. Agencement de presse selon la revendication 15, caractérisé en ce que
    la dépression dans la zone de vide poussé (21) est comprise entre 10 et 60 kPa.
  17. Agencement de presse selon la revendication 15 ou 16, caractérisé en ce que
    la dépression dans la région d'aspiration du rouleau de presse aspiré (16) en dehors de la zone de vide poussé (21) est inférieure à 30 kPa.
  18. Agencement de presse selon l'une quelconque des revendications 15 à 17, caractérisé en ce que
    la région d'aspiration du rouleau de presse aspiré (16) s'étend dans la direction d'avance de la nappe (19) au-delà de la région d'enveloppement de la bande d'égouttage (8).
  19. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de transfert (6) présente une dureté de 80 P&J au maximum, de préférence de 50 P&J au maximum.
  20. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de transfert (6) possède une rugosité Rz comprise entre 5 et 50 microns.
  21. Agencement de presse selon l'une quelconque des revendications 3 à 20, caractérisé en ce que
    la bande de transfert (7) est réalisée sous forme de bande à faible marquage, de préférence sous forme de toile de séchage.
  22. Agencement de presse selon l'une quelconque des revendications 4 à 21, caractérisé en ce que
    le rouleau directeur (14) de la bande de transfert (7) est de préférence entraîné avec une commande de la vitesse de rotation.
  23. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que
    le rouleau de lissage (15) est entraîné avec une commande de couple en fonctionnement normal.
  24. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que
    la troisième fente de presse est ouverte pendant le transfert de la nappe fibreuse (1) et est de préférence entraînée avec une commande de la vitesse de rotation.
  25. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que
    dans le coin s'ouvrant après la troisième fente de presse, un dispositif de soufflage (20) est prévu, lequel orient notamment lors du transfert, de l'air soufflé entre le rouleau de lissage (15) et la nappe fibreuse ( 1 ) .
EP06121946A 2005-10-20 2006-10-09 Agencement de presse Not-in-force EP1777340B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005050282A DE102005050282A1 (de) 2005-10-20 2005-10-20 Pressanordnung

Publications (2)

Publication Number Publication Date
EP1777340A1 EP1777340A1 (fr) 2007-04-25
EP1777340B1 true EP1777340B1 (fr) 2008-12-24

Family

ID=37496798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06121946A Not-in-force EP1777340B1 (fr) 2005-10-20 2006-10-09 Agencement de presse

Country Status (3)

Country Link
EP (1) EP1777340B1 (fr)
AT (1) ATE418644T1 (fr)
DE (2) DE102005050282A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009029625A1 (de) * 2009-09-21 2011-03-24 Voith Patent Gmbh Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE684680C (de) * 1935-06-21 1939-12-02 William Hulse Millspaugh Langsiebpapiermaschine
US4483745A (en) * 1982-09-29 1984-11-20 Beloit Corporation Method and apparatus of sheet transfer using a nonporous smooth surfaced belt
US5298124A (en) * 1992-06-11 1994-03-29 Albany International Corp. Transfer belt in a press nip closed draw transfer
US5876565A (en) * 1994-10-06 1999-03-02 Valmet Corporation Press section with an equalizing nip for compensating for elongation of a paper web
SE514973C2 (sv) * 1999-09-07 2001-05-21 Valmet Karlstad Ab Metod och pappersmaskin för framställning av en liner
DE10137527A1 (de) * 2001-08-01 2003-02-13 Voith Paper Patent Gmbh Pressenanordnung
DE10159115A1 (de) * 2001-12-01 2003-06-18 Voith Paper Patent Gmbh Pressenpartie
DE10226825A1 (de) * 2002-06-15 2003-12-24 Voith Paper Patent Gmbh Pressanordnung
FI116400B (fi) * 2002-11-19 2005-11-15 Metso Paper Inc Paperi- tai kartonkikoneen puristinosa

Also Published As

Publication number Publication date
DE102005050282A1 (de) 2007-06-14
EP1777340A1 (fr) 2007-04-25
DE502006002421D1 (de) 2009-02-05
ATE418644T1 (de) 2009-01-15

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