EP1739228B1 - Machine pour fabriquer une bande fibreuse - Google Patents

Machine pour fabriquer une bande fibreuse Download PDF

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Publication number
EP1739228B1
EP1739228B1 EP06115709A EP06115709A EP1739228B1 EP 1739228 B1 EP1739228 B1 EP 1739228B1 EP 06115709 A EP06115709 A EP 06115709A EP 06115709 A EP06115709 A EP 06115709A EP 1739228 B1 EP1739228 B1 EP 1739228B1
Authority
EP
European Patent Office
Prior art keywords
machine according
press
roll
transfer
belt
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
EP06115709A
Other languages
German (de)
English (en)
Other versions
EP1739228A1 (fr
Inventor
Karl Josef Böck
Johann Moser
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 EP1739228A1 publication Critical patent/EP1739228A1/fr
Application granted granted Critical
Publication of EP1739228B1 publication Critical patent/EP1739228B1/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

Definitions

  • the invention relates to a machine for producing a paper or another fibrous web with a press section according to the preamble of present claim 1.
  • the press section has two pressing points, which are each formed by a press roller cooperating with a shoe press roll.
  • a first upper felt, the paper web coming from a forming wire, an underfelt and a press jacket of a first shoe press roll pass through the first press point.
  • the underfelt continues with the paper web to the second press site. Together with a second top felt and a press jacket of a second press site, the paper web then passes through the second press site.
  • the paper web follows the underfelt further up to a take-off roll, through which it is transferred to a first dryer wire which transfers the paper web to the dryer section.
  • Guide rollers and suction rollers are provided for deflecting the upper felt and the lower felt.
  • a press section for a paper machine in which a central roller ( Fig. 1 ) is used, which cooperates in two press nips with a press roll and a shoe press roll.
  • a central roller Fig. 1
  • the fibrous web is guided on both sides: in the first press nip by a felt and a transfer belt, in the second press nip by the transfer belt and another band.
  • SC super calendered
  • roll-blade shapers i. H. Screen former with a forming roller and drainage strips, without flexible strips in conjunction with a downstream conventional press section built with three press nips.
  • the press nips can also be formed by shoe press rolls.
  • a free-standing press unit is preferably arranged for a fourth press nip.
  • the fibrous web is smoothed by at least two calenders with a plurality of nips (multinip calenders). The calenders follow the speed of calendering paper machine production.
  • the fibrous web is usually dried in the dryer section to a residual moisture content of 2 to 3% and moistened before the reeling station still within the paper machine with the help of a water applicator, such as a nozzle moistener.
  • the residence time of the wound with the paper web of the after winding in the paper machine to the calendering of the paper web in the calenders is between 0.5 and 2 hours. Thanks to the drying out and the long dwell time, a very good moisture distribution in all directions within the paper web can be assumed.
  • a roll-blade former with or without flexible twin-mesh bars is used in conjunction with two freestanding shoe presses or a freestanding roller press and a subsequent shoe press in conjunction with a multi-pin calender.
  • a roll-blade former with or without flexible strips in the twin-wire area and a conventional three-nip press with or without Schuhnip used in conjunction with a multi-pin calender.
  • productivity in an online process can be significantly higher due to the loss of rewinding losses caused by winding, unwinding, and rewinding the web after calendering.
  • a conventional press section which is designed as a three-nip press without an additional free-standing fourth press generally shows a very strong structure two-sidedness of the paper due to asymmetric dewatering conditions in the press, as in the second and third press nip the dewatering takes place only to the top.
  • the dry content may indeed be increased significantly, which generally leads to a higher speed and consequently also to a higher productivity.
  • the heavier dewatering to the top further increases paper two-sidedness. Therefore, for high quality papers a free-standing fourth press with drainage reversal to the bottom is absolutely necessary.
  • the disadvantage of this concept is that the paper web must be conveyed over two areas in the open draw. It runs freely between the central roll after the third press and from the fourth press. This has a negative impact on the runnability of the paper web. The paper web overstretches. It can tears and transverse contractions occur, which significantly reduce the maximum speed potential.
  • the line force generated in the first press nip formed by the first press roll and the central roll is at most 50kN / m, preferably at most 30kN / m.
  • the fibrous web 1 is transferred to the transfer belt 10 in the region of the press nip 9 gently.
  • the paper web For further mechanical dewatering after the wire section, the paper web, supported and guided by press felts or impermeable or permeable transfer belts, passes through several press nips formed by pairs of rolls. Due to the intensive contact of the paper web with the felt surface in the press nip, it is necessary for high-quality papers, each paper side the final contact with a smooth roller or a smooth transfer belt to enable. This smoothing takes place in a conventional press section with or without Schuhnip on the central roll and for the upper side in a subsequent press in which the paper web passes through a fourth press nip.
  • the operation of a shoe tip in the third press nip can increase the dry content compared to conventional roll nips by up to four percent. However, this positive effect is at the expense of the surface quality and thus the printability, in particular the felt-contacting surface of the paper web.
  • the first press nip may be formed as a Schuhnip to further increase the dry content.
  • SC papers high-quality uncoated magazine papers
  • a fourth press nip is essential, with the paper web being led through the press nip together with an underfelt for smoothing.
  • This nip can also be used as a Schuhnip with extended residence time to enhance the smoothness effect.
  • the transfer suction roll advantageously has a rubberized mantle surface. It may also have a drilling pattern in its roll shell.
  • the roller can be variably adjusted in its immersion depth with respect to the paper web and the transfer belt.
  • an adjusting device is provided, by means of which the roller is movable.
  • novel press felts can be used in all positions.
  • An extremely fine surface of the press felts is due to the use of a certain amount of molten fiber material. By this measure, the negative appearing felt marks are drastically reduced.
  • the advantages of the invention are that highest production speeds due to the achievement of maximum dry contents after passing through the wire section and the press section and as a result of minimizing the free draws in the press section by the use of the transfer belt are possible. Due to the wet smoothness effect in the press section on both sides of the paper web also a gentle calendering is possible. By means of the press section constructed according to the invention, best printability properties, especially for gravure printing, are achieved on account of improved topography properties of the base paper.
  • the transfer belt preferably has a smooth surface and is in particular water-impermeable.
  • the transfer belt can also be at least light permeable to air. The ventilation caused thereby improves the web picking behavior.
  • the fourth press nip is formed on a separate press.
  • the upper roller of the fourth press is formed in particular with a smooth surface.
  • the fibrous web coming from the compact press forming the first three press nips has a roughness two-sidedness, since the upper side is rougher than its lower side.
  • the decrease of the fibrous web from the smooth roll in the fourth press can be effected by a suction element, in particular a suction roll.
  • the suction roll preferably has a porous cover, more preferably a soft, felt-like cover.
  • a good web removal from the suction element results according to a further embodiment of the invention by a further suction roll.
  • This is preferably wrapped by the dryer fabric of a subsequent dryer section, so that the fibrous web is transferred directly through the dryer fabric in the dryer section.
  • the transfer element for transferring the fibrous web from the transfer belt to the fourth press nip preferably has a soft, in particular air-permeable, reference.
  • the cover may be made of plastic or a felt. Hereby a good transfer can be achieved.
  • the transfer element is driven. This ensures a safe transfer of the fibrous web become.
  • a transfer element can be provided in addition to a transfer suction and a particular air-permeable belt loop.
  • a felt belt with a fine pile can be used.
  • the web loop in the web-guiding area can be in particular vacuumed, i.
  • On the side facing away from the fibrous web are subjected to negative pressure, for example by foils, suction boxes or other known suction devices.
  • negative pressure for example by foils, suction boxes or other known suction devices.
  • the belt loop can also wrap around several guide rollers. In this case, preferably at least one roller of the belt loop is driven. This results in a larger belt loop for the transmission of the fibrous web with corresponding advantages.
  • the upper roller of the fourth press nip is wrapped in a further embodiment of the invention with a smoothing belt.
  • the smoothing surface can be easily changed by changing the band. For example, this may be necessary to optimize the web delivery performance of smooth surfaces.
  • the smoothing strip in particular has a smooth surface.
  • the smoothing tape may be dense or permeable to air.
  • the smoothing belt can basically be designed like the transfer belt. In particular, all three bands, smoothing belt, transfer belt and belt of the belt loop, can be made equal. This results in a uniform treatment of the fibrous web.
  • the arrangement is such that the transfer of the fibrous web through the transfer element takes place directly in the region of the free felt train of the fourth press.
  • a suction element for better Bahnabgabe or railway recording be provided in the transfer area in the felt loop. Space can be saved thanks to the direct rail transfer.
  • the production is simplified.
  • the transfer element can also have at least two vacuum zones, specifically a pickup zone and a holding zone.
  • the vacuum in the pickup zone is preferably higher than that in the holding zone. This allows a particularly good and yet gentle web transfer can be achieved.
  • the second press nip 9 can be operated such that the line force generated is a maximum of 50 kN / m, preferably a maximum of 30 kN / m.
  • This very low line force also called “kissing contact” becomes a gentle one
  • Treatment of the fibrous web in the second press nip 9 ensures the press section, wherein the "kissing contact” is essentially there to transfer the fibrous web 1 from the Squeeze roll 5 to the central roll 8.
  • the "Kissing Contact” operation can of course also be applied to all embodiments described in the following figures.
  • a transfer belt 10 is passed together with the fibrous web 1 through the press nip 9. Subsequently, the top felt 3 is led away from the press suction roll 5.
  • the fibrous web 1 is then passed together with the transfer belt 10 and another top felt 11 through a press nip 12 which is formed by the central roll 8 and a shoe press roll 14 equipped with a shoe press zone 13.
  • the fibrous web 1 is sucked off by a transfer suction roll 15 from the transfer belt 10 and transferred by means of another transfer suction roll 16 onto a lower felt 17. Thereafter, the fibrous web 1 is passed together with the lower felt 17 through the belonging to a free-standing press unit press rollers 18, 19, which together form a fourth press nip 20.
  • the upper roller 19 of the fourth press nip 20 has a smooth surface. From this roller 19, the fibrous web 1 is removed by means of a suction roller 21 with a porous, preferably soft cover. From the roller 21, in turn, the fibrous web is removed by a suction roller 22. The suction roll 22 is thereby looped by a drying wire 23 of the subsequent drying section, of which two drying cylinders 24 and 25 and a duo stabilizer 26 are shown. Instead of the Duostabilisators also a HiDryer can be used.
  • Fig. 2 is largely consistent with that of Fig. 1 match.
  • the third press nip 12 is designed as a shoe press nip.
  • the transfer suction roll 15 is replaced by a belt loop 27, which is formed in particular by an air-permeable felt with fine pile.
  • the belt loop 27 is guided over a suction roll 28 and a driven roll 29.
  • suction elements 30 may be arranged. These are, for example, foils, suction boxes or other suction devices known in paper technology.
  • the variant of Fig. 3 agrees with the variant of Fig. 2 largely coincide. Unlike the variant of Fig. 2 is in the variant of Fig. 3 However, the upper roller 19 of the fourth press nip 20 looped around with a smoothing belt 31.
  • This smoothing belt 31 in particular has a smooth surface and may be dense or permeable to air.
  • the smoothing belt 31 may be formed like the transfer belt 10.
  • the band of the belt loop 27 may be formed in the same way.
  • rollers 6 forming the first press nip 4 may also comprise a shoe press unit 7.
  • the variant of Fig. 4 again largely agrees with the variant of Fig. 1 match.
  • the difference is that the fibrous web 1 is transferred by the transfer suction roll 15 directly in the region of the free felt train of the felt 17 of the fourth press 18, 19 to this.
  • the transfer area can be provided in the felt loop 17, a suction element 32 for better web recording or delivery.
  • the transfer suction roll 15 has a pickup zone 33 and a holding zone 34, wherein the vacuum in the pickup zone 33 is greater than in the holding zone 34. Basically can also be provided more vacuum zones.
  • the transfer belt 10 is also provided with a cleaning device.
  • a cleaning device This consists of a spray tube 35, a dirt removal roller 36 and a collecting and collecting device 37th

Landscapes

  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Claims (35)

  1. Machine de fabrication d'une bande de papier ou d'une autre matière fibreuse (1) comprenant une section de presses avec des lignes de contact à feutre, dans laquelle la bande de matière fibreuse (1) peut être guidée à travers une première ligne de pressage et sur un rouleau central (8) formant deux lignes de pressage (9, 12) avec un premier (5) et un deuxième (14) rouleaux de pressage, dans laquelle la bande de matière fibreuse (1) peut être menée avec une bande de transfert (10) à travers les lignes de pressage (9, 12) formées entre le rouleau central (8) et les rouleaux de pressage (5, 14), caractérisée en ce que la bande de matière fibreuse (1) peut être transmise par un élément de transfert (15) de la bande de transfert (10) à un autre feutre (17) et peut être menée à travers une quatrième ligne de pressage (20).
  2. Machine selon la revendication 1, caractérisée en ce que la force linéaire produite dans la première ligne de pressage (9) formée par le premier rouleau de pressage (5) et le rouleau central (8) vaut au maximum 50 kN/m, de préférence au maximum 30 kN/m.
  3. Machine selon la revendication 1 ou 2, caractérisée en ce que la bande de matière fibreuse (1) peut être transmise par un rouleau de transfert aspirant (15) de la bande de transfert (10) à un feutre inférieur (17) et peut être menée à travers la quatrième ligne de pressage (20).
  4. Machine selon la revendication 3, caractérisée en ce que le rouleau de transfert aspirant (15) comprend une surface latérale caoutchoutée et/ou un réseau de trous dans la surface latérale.
  5. Machine selon la revendication 3 ou 4, caractérisée en ce que le rouleau de transfert aspirant (15) est réglable, en profondeur de pénétration, par rapport à la bande de transfert (10) et à la bande de matière fibreuse (1).
  6. Machine selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le deuxième rouleau de pressage (14) est un rouleau de pressage à sabot et comprend une zone de pressage à sabot (13).
  7. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que le premier rouleau de pressage (6) est un rouleau de pressage à sabot et comprend une zone de pressage à sabot (7) .
  8. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la bande de transfert (10) présente une surface lisse.
  9. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la bande de transfert (10) est imperméable à l'eau.
  10. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la bande de transfert (10) est au moins légèrement perméable à l'air.
  11. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu un dispositif de nettoyage (35, 36, 37) pour la bande de transfert (10).
  12. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la quatrième ligne de pressage (20) est formée sur une presse séparée (18, 19).
  13. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la surface du rouleau supérieur (19) de la quatrième ligne de pressage (20) est lisse.
  14. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la reprise de la bande de matière fibreuse du rouleau supérieur (19) de la quatrième ligne de pressage (20) est effectuée par un élément aspirant, en particulier un rouleau aspirant (21).
  15. Machine selon la revendication 14, caractérisée en ce que le rouleau aspirant (21) présente un revêtement poreux.
  16. Machine selon l'une quelconque des revendications 14 ou 15, caractérisée en ce que le rouleau aspirant (21) présente un revêtement souple, de type feutre.
  17. Machine selon l'une quelconque des revendications 14 à 16, caractérisée en ce que la reprise de l'élément aspirant (21) est effectuée par un rouleau aspirant (22).
  18. Machine selon la revendication 17, caractérisée en ce que le rouleau aspirant (22) est enveloppé par la toile de séchage (23) d'une section de séchage qui suit (24, 25, 26).
  19. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément de transfert (15) est pourvu d'un revêtement souple, perméable à l'air.
  20. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément de transfert (15) est entraîné.
  21. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu comme élément de transfert une boucle de bande (27) en particulier perméable à l'air.
  22. Machine selon la revendication 21, caractérisée en ce que la boucle de bande (27) est un feutre, en particulier avec un poil fin.
  23. Machine selon l'une quelconque des revendications 21 ou 22, caractérisée en ce que la boucle de bande (27) est aspirée dans la zone de guidage de la bande.
  24. Machine selon l'une quelconque des revendications 21 à 23, caractérisée en ce que la boucle de bande (27) enveloppe plusieurs rouleaux de déviation.
  25. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que le rouleau supérieur (19) de la quatrième ligne de pressage (20) est enveloppé par une bande de lissage (31).
  26. Machine selon la revendication 25, caractérisée en ce que la bande de lissage (31) présente une surface lisse.
  27. Machine selon l'une quelconque des revendications 25 ou 26, caractérisée en ce que la bande de lissage (31) est imperméable à l'air.
  28. Machine selon l'une quelconque des revendications 25 ou 26, caractérisée en ce que la bande de lissage (31) est perméable à l'air.
  29. Machine selon l'une quelconque des revendications 25 à 28, caractérisée en ce que la bande de transfert (10) et la bande de lissage (31) sont identiques.
  30. Machine selon l'une quelconque des revendications 25 à 28, caractérisée en ce que les trois bandes, la bande de transfert (10), la bande de lissage (31) et la boucle de bande (27) sont toutes identiques.
  31. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la transmission de la bande de matière fibreuse (1) par l'élément de transfert (15) est effectuée directement dans la région du trajet libre du feutre (17) de la quatrième presse (18, 19) sur ce feutre (17).
  32. Machine selon la revendication 31, caractérisée en ce qu'un élément aspirant (32) est disposé dans la zone de transfert.
  33. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément de transfert (15) comprend deux zones d'aspiration (33, 34), ou plus.
  34. Machine selon la revendication 33, caractérisée en ce que l'élément de transfert (15) comprend une zone de reprise (33) et une zone de maintien (34).
  35. Machine selon la revendication 34, caractérisée en ce que le vide de la zone de reprise (33) est plus élevé que le vide de la zone de maintien (34).
EP06115709A 2005-07-01 2006-06-20 Machine pour fabriquer une bande fibreuse Not-in-force EP1739228B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005031203A DE102005031203A1 (de) 2005-07-01 2005-07-01 Papiermaschine

Publications (2)

Publication Number Publication Date
EP1739228A1 EP1739228A1 (fr) 2007-01-03
EP1739228B1 true EP1739228B1 (fr) 2008-02-13

Family

ID=37036926

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06115709A Not-in-force EP1739228B1 (fr) 2005-07-01 2006-06-20 Machine pour fabriquer une bande fibreuse

Country Status (3)

Country Link
EP (1) EP1739228B1 (fr)
AT (1) ATE386154T1 (fr)
DE (2) DE102005031203A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT504090B1 (de) * 2006-09-13 2008-09-15 Andberg Janne Johannes Wechselseitige glättanordnung einer entwässerungsvorrichtung mit einer gewebeüberzogenen überführsaugwalze
FI121146B (fi) 2008-06-19 2010-07-30 Metso Paper Inc Rainanmuodostuskone ja menetelmä rainanmuodostuskoneessa
DE102018119381A1 (de) * 2018-08-09 2020-02-13 Voith Patent Gmbh Pressanordnung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI88812C (fi) * 1992-03-05 1993-07-12 Valmet Paper Machinery Inc Anordning vid styrning av banans spetsdragningsband i en pappersmaskin
US5766422A (en) * 1996-08-01 1998-06-16 Beloit Technologies, Inc. Lightweight high temperature pressing
DE19702575A1 (de) * 1997-01-24 1998-07-30 Voith Sulzer Papiermasch Gmbh Maschine zur Herstellung einer Faserstoffbahn
DE19744341A1 (de) * 1997-10-07 1999-04-15 Voith Sulzer Papiertech Patent Papiermaschine
FI112873B (fi) * 1999-03-12 2004-01-30 Metso Paper Inc Menetelmä ja sovitelma paperi- ja kartonkirainan käsittelemiseksi
WO2003071028A1 (fr) * 2002-02-22 2003-08-28 Voith Paper Patent Gmbh Dispositif de lissage

Also Published As

Publication number Publication date
ATE386154T1 (de) 2008-03-15
EP1739228A1 (fr) 2007-01-03
DE502006000339D1 (de) 2008-03-27
DE102005031203A1 (de) 2007-01-25

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