EP1777342B1 - Agencement de presse - Google Patents

Agencement de presse Download PDF

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Publication number
EP1777342B1
EP1777342B1 EP20060121951 EP06121951A EP1777342B1 EP 1777342 B1 EP1777342 B1 EP 1777342B1 EP 20060121951 EP20060121951 EP 20060121951 EP 06121951 A EP06121951 A EP 06121951A EP 1777342 B1 EP1777342 B1 EP 1777342B1
Authority
EP
European Patent Office
Prior art keywords
press
arrangement according
roll
smoothing
fibrous 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
EP20060121951
Other languages
German (de)
English (en)
Other versions
EP1777342A1 (fr
Inventor
Daniel Gronych
Robert Koplin
Helmut Sterz
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 EP1777342A1 publication Critical patent/EP1777342A1/fr
Application granted granted Critical
Publication of EP1777342B1 publication Critical patent/EP1777342B1/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.
  • Press arrangements consist of one or more press nips, through which the fibrous web is guided together with water-absorbing press felts.
  • press felts have a relatively rough contact surface, resulting in a relatively high roughness of the fibrous web.
  • the surface of the fibrous web can also be influenced relatively easily.
  • the object of the invention is therefore to improve the web guide in such smoothing press nips with the least possible effort.
  • the negative pressure of the suction press roll acts on the fibrous web through the press belt and sucks it to the press belt.
  • the smooth pressing surface is formed by a smooth cylindrical smoothing roll.
  • the smoothing roller has a coating, preferably of ceramic.
  • the continuation of the fibrous web on the press belt can be facilitated even after the smoothing press nip in that the diameter of the smoothing roll is smaller than or equal to the diameter of the suction press roll.
  • the press belt should be as smooth as possible and preferably fibers with at most 11 dtex or a coating of polymers or an increased number of hot melt adhesive fibers on the contact side Have fibrous web.
  • the suction region of the suction press roll should extend at least over the wrap area of the press belt, preferably at least slightly beyond it.
  • the suction press roll has a plurality of suction zones, preferably one behind the other in the web running direction.
  • the suction press roll in the region of the smoothing press nip has a high vacuum zone, which preferably also extends in the web running direction beyond, preferably up to 60 mm beyond the smoothing press nip addition.
  • this should have a maximum hardness of 80, preferably a maximum of 50 P & J.
  • the transfer ribbon has a roughness Rz between 5 and 50 microns.
  • the suction press roll is preferably driven speed-controlled.
  • the smoothing roller is also driven.
  • the drive is moment-controlled in normal operation.
  • nip is opened during the transfer of the fibrous web and the smoothing roller is preferably driven speed controlled.
  • the transfer belt wraps around an evacuated guide roll, as in the case of removal from the transfer belt, it is advantageous if the guide roll of the transfer belt is preferably speed-controlled in order to enable it to move with the suction press roll.
  • a blowing device should be located in the opening gusset after the third smoothing press nip, which in particular directs blowing air between the smoothing roll and the fibrous web when transferring.
  • the suction press roll in the area of takeover of the fibrous web from the transfer belt should have a transfer zone whose negative pressure may preferably be below 30 kPa.
  • the negative pressure is preferably less than 20 kPa.
  • a post zone should follow the high vacuum zone in the web running direction. This post-zone can absorb thrown off the press belt after its removal from the suction press roll thrown off water.
  • a water collecting device preferably in the form of a gutter, in the opening gusset between the suction press roll and the press belt.
  • the smoothing press nip should be preceded by at least one extended press nip.
  • the fibrous web should be guided through the extended press nip with water-absorbing drainage tape on both sides.
  • two or three press nips upstream of the smoothing press nip are sufficient.
  • At least one of the upstream press nips should have a smooth pressing surface on the side of the fibrous web opposite the smooth press surface of the smoothing 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.
  • 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 rollers 11,13 have a flexible roll shell, the one of Pressing element with concave pressing surface to the respective counter-roller 10,12 is pressed.
  • 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.
  • This transfer belt 7 leads the fibrous web 1 to another, lower, water-absorbing press belt 8 in the form of a press felt of a third press nip.
  • This smoothing press nip is formed by a suction press roll 16 looped by the press belt 8 and an upper smoothing roll 15. In this case, the transfer of the fibrous web 1 takes place while the press belt 8 wraps around the suction press roll 16.
  • the press belt 8 transfers the fibrous web 1 to an air-permeable belt 9 in the form of a drying wire of a following drying group of a dryer section of the machine, which is supported by a guide roller 17, which is looped around by the drying wire.
  • 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 drainage bands 3, 4, 5, 7 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 roller 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 press belt 8 of the smoothing press nip should not only be water-absorbent and permeable to air, but also should be as smooth as possible. This supports the smoothing of the fibrous web 1 in the smoothing press nip and increases the adhesion of the fibrous web 1 to the press belt 8.
  • a blowing device 20 which directs in particular during transfer blowing air between the smoothing roll 15 and the fibrous web 1.
  • This smoothing roll 15 is provided to ensure sufficient smoothness with a ceramic coating.
  • the suction press roll 16 has a plurality of suction zones 21, 22, 23, 24 arranged one behind the other in the web running direction 19.
  • the holding zone 22 is intended only to 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 suction-pressure roller 16 and the expiring press belt. 8
  • 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.
  • This first press nip of the press arrangement is formed by an upper shoe press roll 11 and a cylindrical counter roll 10. Both press rolls 10, 11 each have a water-absorbing drainage band 3, 4.
  • the lower dewatering belt 4 transfers the fibrous web 1 after the extended press nip and the routing of the upper dewatering belt 3 to the transfer belt 7. From this the fibrous web 1 passes to the press belt 8 of the smoothing press nip.
  • the first press nip of the press assembly is formed by an upper suction press roll 26 and a lower shoe press roll 27. Also, both press rolls have their own water-absorbing drainage tape 28,29.
  • the upper dewatering belt 28 takes over the fibrous web 1 not only from the forming wire 2, it also leads the fibrous web 1 after the extended press nip by a second press nip.
  • This third press nip is formed by a shoe press roll 13 and the press roll 12 wrapped by a water-absorbing dewatering belt 5. This means that this press roller 12 is involved in the formation of two press nips, which makes the arrangement very compact.
  • the transfer belt 6 then guides the fibrous web 1 until it is transferred to the transfer belt 7. From there it reaches the press belt 8 and through the smoothing press nip.
  • the contact with the transfer belt 6 and the smoothing roller 15 results in an increased smoothness on both sides of the fibrous web 2. Furthermore, the multiplicity of press nips leads to a very high dewatering performance of the press arrangement.

Landscapes

  • Paper (AREA)

Claims (33)

  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 celle-ci, comprenant au moins une fente de pressage-lissage à travers laquelle la nappe fibreuse (1) passe conjointement avec une bande de pressage (8) perméable à l'air et absorbant l'eau et dont la surface de pressage disposée du côté de la nappe fibreuse (1) opposé à la bande de pressage (8) est réalisée sous forme lisse, la surface de pressage opposée à la surface de pressage lisse étant formée par un cylindre de pressage aspirant (16), le cylindre de pressage aspirant (16) étant entraîné et possédant plusieurs zones d'aspiration (21, 22, 23, 24) et la surface de pressage lisse étant formée par un cylindre de lissage lisse cylindrique entraîné (15), caractérisé en ce que
    le cylindre de pressage aspirant (16) est entraîné avec une vitesse de rotation commandée, le cylindre de lissage (15) est entraîné pendant le fonctionnement normal avec un couple commandé et la fente de lissage est ouverte pendant le transport de la nappe fibreuse (1).
  2. Agencement de presse selon la revendication 1, caractérisé en ce que le cylindre de lissage (15) présente un revêtement, de préférence en céramique.
  3. Agencement de presse selon la revendication 1 ou 2, caractérisé en ce que le diamètre du cylindre de lissage (15) est inférieur ou égal au diamètre du cylindre de pressage aspirant (16).
  4. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de pressage (8) présente des fibres de 11 dtex au maximum ou un revêtement de polymères sur le côté en contact avec la nappe fibreuse.
  5. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que la région d'aspiration du cylindre de pressage aspirant (16) s'étend au moins sur la région d'enveloppement de la bande de pressage (8).
  6. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que le cylindre de pressage aspirant (16) possède plusieurs zones d'aspiration (21, 22, 23, 24) disposées les unes derrière les autres dans la direction d'avance de la nappe (19).
  7. Agencement de presse selon la revendication 6, caractérisé en ce que le cylindre de pressage aspirant (16) possède une zone de vide poussé (21) dans la région de la fente de pressage-lissage, laquelle s'étend de préférence également au-delà de celle-ci dans la direction d'avance de la nappe (19).
  8. Agencement de presse selon la revendication 7, caractérisé en ce que la zone de vide poussé (21) s'étend jusqu'à 60 mm au-delà de la fente de pressage-lissage.
  9. Agencement de presse selon la revendication 7 ou 8, caractérisé en ce que la dépression dans la zone de vide poussé (21) est comprise entre 10 et 60 kPa.
  10. Agencement de presse selon l'une quelconque des revendications 7 à 9, caractérisé en ce que la dépression dans la région d'aspiration du cylindre de pressage aspirant (16) à l'extérieur de la zone de vide poussé (21) est inférieure à 30 kPa.
  11. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de pressage (8) reprend la nappe fibreuse (1) pendant l'enveloppement du cylindre de pressage aspirant (16) de préférence par une bande de transport (7) d'une unité montée en amont.
  12. Agencement de presse selon la revendication 11, caractérisé en ce que la bande de transport (7) est réalisée sous forme de bande d'égouttage perméable à l'air et absorbant l'eau, qui entoure de préférence un cylindre de pressage d'une fente de pressage montée en amont.
  13. Agencement de presse selon la revendication 11, caractérisé en ce que la bande de transport (7) reprend la nappe fibreuse (1) d'une bande de transfert lisse (6) qui entoure de préférence un cylindre de pressage (12) d'une fente de pressage montée en amont.
  14. Agencement de presse selon la revendication 13, caractérisé en ce que la bande de transport (7) est perméable à l'air et, pendant le transport de la nappe fibreuse (1) par la bande de transfert (6), entoure un cylindre directeur, de préférence aspiré (14).
  15. Agencement de presse selon l'une quelconque des revendications 11 à 14, caractérisé en ce que l'unité montée en amont est formée par une ou plusieurs fentes de pressage pour l'égouttage de la nappe fibreuse (1).
  16. Agencement de presse selon l'une quelconque des revendications 13 à 15, caractérisé en ce que la bande de transfert (6) présente une dureté maximale de 80, de préférence de 50 P&J.
  17. Agencement de presse selon l'une quelconque des revendications 13 à 16, caractérisé en ce que la bande de transfert (6) présente une rugosité Rz comprise entre 5 et 50 microns.
  18. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que pendant le transport de la nappe fibreuse (1), le cylindre de lissage (15) est entraîné avec une vitesse de rotation commandée.
  19. Agencement de presse selon l'une quelconque des revendications 14 à 18, caractérisé en ce que le cylindre directeur (14) de la bande de transport (7) est de préférence entraîné avec une vitesse de rotation commandée.
  20. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que dans le coin s'ouvrant après la fente de pressage-lissage se trouve un dispositif de soufflage (20) qui dirige, notamment lors du transport, de l'air de soufflage entre le cylindre de lissage (15) et la nappe fibreuse (1).
  21. Agencement de presse selon l'une quelconque des revendications 11 à 20, caractérisé en ce que le cylindre de pressage aspirant (16) présente dans la région du transport de la nappe fibreuse (1) par la bande de transport (7) une zone de transport (23) dont la dépression est de préférence inférieure à 30 kPa.
  22. Agencement de presse selon la revendication 7 et la revendication 21, caractérisé en ce qu'entre la zone de transport (23) et la zone de vide poussé (21) se trouve une zone de retenue (22) dont la dépression est de préférence inférieure à 20 kPa.
  23. Agencement de presse selon la revendication 22, caractérisé en ce qu'une zone postérieure (24) se raccorde à la zone de vide poussé (21) dans la direction d'avance de la nappe (19).
  24. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que dans le coin s'ouvrant entre le rouleau de pressage aspirant (16) et la bande de pressage (8) se trouve un dispositif de collecte d'eau (25), de préférence sous la forme d'une rigole d'eau.
  25. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que la fente de pressage-lissage est montée en amont d'au moins une fente de pressage prolongée.
  26. Agencement de presse selon la revendication 25, caractérisé en ce que la nappe fibreuse est guidée à travers la fente de pressage prolongée avec une bande d'égouttage respective de chaque côté (3, 4, 28, 29) absorbant l'eau.
  27. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce qu'en amont de la fente de pressage-lissage n'est disposée qu'une autre fente de pressage.
  28. Agencement de presse selon l'une quelconque des revendications 1 à 26, caractérisé en ce qu'en amont de la fente de pressage-lissage sont disposées plusieurs fentes de pressage.
  29. Agencement de presse selon la revendication 28, caractérisé en ce qu'en amont de la fente de pressage-lissage sont disposées deux autres fentes de pressage.
  30. Agencement de presse selon la revendication 28, caractérisé en ce qu'en amont de la fente de pressage-lissage sont disposées trois autres fentes de pressage.
  31. Agencement de presse selon l'une quelconque des revendications 27 à 30, caractérisé en ce qu'au moins l'une des fentes de pressage montées en amont présente une surface de pressage lisse sur le côté de la nappe fibreuse (1) opposé à la surface de pressage lisse de la fente de pressage-lissage.
  32. Agencement de presse selon la revendication 13 et la revendication 31, caractérisé en ce que la surface de pressage lisse de la fente de pressage montée en amont est formée par la bande de transfert (6).
  33. Agencement de presse selon l'une quelconque des revendications précédentes, caractérisé en ce que la fente de pressage-lissage est la dernière fente de pressage de l'agencement de presse.
EP20060121951 2005-10-20 2006-10-09 Agencement de presse Not-in-force EP1777342B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510050281 DE102005050281A1 (de) 2005-10-20 2005-10-20 Pressanordnung

Publications (2)

Publication Number Publication Date
EP1777342A1 EP1777342A1 (fr) 2007-04-25
EP1777342B1 true EP1777342B1 (fr) 2014-03-19

Family

ID=37499418

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060121951 Not-in-force EP1777342B1 (fr) 2005-10-20 2006-10-09 Agencement de presse

Country Status (2)

Country Link
EP (1) EP1777342B1 (fr)
DE (1) DE102005050281A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008000151A1 (de) * 2008-01-25 2009-07-30 Voith Patent Gmbh Vorrichtung zur Herstellung und/oder Behandlung einer Faserstoffbahn
DE102009047470A1 (de) * 2009-12-03 2011-06-09 Voith Patent Gmbh Vorrichtung zur Behandlung einer laufenden Papier-, Karton- oder anderen Faserstoffbahn
DE102016209780A1 (de) * 2016-06-03 2017-12-07 Voith Patent Gmbh Pressenpartie

Family Cites Families (11)

* 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
GB458758A (en) * 1935-06-21 1936-12-21 William Hulse Millspaugh Improvements in or relating to paper making machines
US2959222A (en) * 1957-06-05 1960-11-08 Beloit Iron Works Pickup and press section
FI803021A7 (fi) * 1980-09-25 1981-01-01 Valmet Oy Menetelmä paperikoneen puristinosassa.
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
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
FI20020804A0 (fi) * 2002-04-26 2002-04-26 Tamfelt Oyj Abp Järjestely paperikoneen puristinosalla
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
DE102005050281A1 (de) 2007-04-26
EP1777342A1 (fr) 2007-04-25

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