EP2072672B1 - Agencement pour la section de pressage d'une machine de fabrication d'une bande de matériau - Google Patents

Agencement pour la section de pressage d'une machine de fabrication d'une bande de matériau Download PDF

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Publication number
EP2072672B1
EP2072672B1 EP07150200A EP07150200A EP2072672B1 EP 2072672 B1 EP2072672 B1 EP 2072672B1 EP 07150200 A EP07150200 A EP 07150200A EP 07150200 A EP07150200 A EP 07150200A EP 2072672 B1 EP2072672 B1 EP 2072672B1
Authority
EP
European Patent Office
Prior art keywords
smoothing
press
web
arrangement according
roll
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
EP07150200A
Other languages
German (de)
English (en)
Other versions
EP2072672A1 (fr
Inventor
Kari RÄISÄNEN
Petter Honkalampi
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Priority to EP07150200A priority Critical patent/EP2072672B1/fr
Priority to AT07150200T priority patent/ATE518989T1/de
Priority to CN2008101778058A priority patent/CN101463575B/zh
Publication of EP2072672A1 publication Critical patent/EP2072672A1/fr
Application granted granted Critical
Publication of EP2072672B1 publication Critical patent/EP2072672B1/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
    • 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
    • D21F3/0281—Wet presses in combination with a dryer roll
    • 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
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt

Definitions

  • the present invention relates to an arrangement for the press section of a web-forming machine, which arrangement includes the features as defined in claim 1.
  • the press section In the press section of a web-forming machine lots of water is rapidly removed from the web.
  • the press section has usually one or two press nips and press felts are also used.
  • the press nip is often formed of two rolls arranged to be loaded against each other.
  • the quick removing of water causes surface densification of the same side of the web where the water is removed. Simultaneously, an oil absorption reduction appears and the print quality degrades.
  • a smoothing press is arranged after the press section. Traditionally the smoothing press includes two rolls forming a nip. The web is thus pressed in the nip without any press felt. Due to this fact water is not removed from the web in the smoothing press. However, both surfaces of the wet web get smoother which improves drying of the web in the drying section.
  • One target in the web-forming is to maintain both sides of the web as symmetrical as possible.
  • this has occasionally required very complicated structures in the press sections and smoothing presses.
  • the water may turn to steam with a sudden heat or press impulse. This leads to delamination of the web.
  • the brightness and opacity of the web may decrease and the web can stick to the surfaces, for example to the surface of the roll.
  • DE 10 2005 021106 A1 discloses a paper mill having a web smoothing station formed by two drums one of which has a flexible mantle that is pressed against the adjacent drum by a convex hydraulic shoe.
  • the hydraulic shoe is an axial, flexible unit forming an elongated press gap.
  • the extended gap is formed by two drums, each of which is in contact with a dewatering belt.
  • EP-A-0 828 028 discloses a system to give a gloss to a paper web in a papermaking machine.
  • the system has a carrier belt to carry the damp paper web between two papermaking units, and through a polishing roller with a smooth surface which is rotated at a different speed from the speed of the carrier belt.
  • the invention is intended to create a new type of arrangement in connection with the press section of a web-forming machine by means of which arrangement the quality of the surfaces of the web can be improved together with better drying properties.
  • the characteristic features of this invention are stated in the accompanying Claims.
  • the arrangement according to the invention is a new kind of combination of a press nip and a smoothing press.
  • the smoothing press according to the invention the web is heated efficiently without any risk of delamination. Simultaneously, both surfaces of the web get smooth which intensifies drying of the web. Other properties and advantages of the arrangement are discussed later.
  • the paper or board produced in the arrangement according to the invention has surprisingly improved properties, above all, the initial smoothness of the paper or board product is improved resulting in improved stiffness and more efficient drying of the paper or board. Dry content of 45% or more, preferably 55% or more before cylinder drying section enables smoothing with lower nip loads and without the need of moisturising.
  • Figures 1a - 2b shows some arrangements according to the invention in connection with the press section of a web-forming machine.
  • the arrangement includes at least one press nip 10 for dewatering the web 11 manufactured on a web-forming machine. In Figure 1a there is actually three press nips.
  • the arrangement also includes a smoothing press 12 including a smoothing roll 13.
  • the smoothing press 12 is arranged after the press nip 10. When arriving to the smoothing press, the web has a dry content of 45% or more, preferably 55% or more before cylinder drying section.
  • the smoothing press 12 also includes smooth heat carrying means 14', such as a belt 14.
  • the belt is preferably made of partly or wholly metal.
  • the metal belt is smooth and has no void volume for water removal.
  • the belt 14 is arranged as a loop around at least two guide rolls 15.
  • the smoothing roll 13 is then arranged into contact with the belt 14 between two guide rolls 15.
  • a non-water removing long nip area is formed with the metal belt.
  • the web is guided between the belt and the smoothing roll. Then both surfaces of the web will be smoothened in this long wrap metal belt smoothing nip.
  • the smoothing roll 13 and/or at least one of the guide rolls 15 can be deflection compensated.
  • a guide roll is deflection compensated at least when it forms a nip with the smoothing roll.
  • a deflection compensated roll adapts to the bending forces of the smoothing nip and/or metal belt tension which also gives a better control of evenness of smoothing.
  • the smoothing roll and/or guide rolls can be heated.
  • the web is also heated in an efficient way.
  • the rolls are internally heated with heating medium, for example with oil or steam.
  • the press nip 10 is a roll nip or a long nip press.
  • a long nip and low specific pressure in the press nip is very beneficial to the final bulk and bending stiffness of the paper or board.
  • the long nip press is a shoe press. With the shoe press high amount of water can be removed from the web. This increases both bulk and dry content of the paper or board but it can make the surfaces of the web porous.
  • the web is then smoothened in the smoothing press according to the invention. This results in a paper or board with improved bulk or in a paper or board with improved surface properties with standard bulk. Simultaneously, drying efficiency can be improved since the contact between the web and the drying rolls is improved.
  • the belt and the smoothing roll have very smooth surfaces which is important in view of smoothing. Due to the long nip area in the smoothing press heat has time to penetrate through the web and thus also to increasing the temperature of the whole web.
  • the smoothing press according to the invention has a more efficient heating equipment compared to prior art.
  • the smoothing roll 13 can be a heated roll.
  • at least one of the guide rolls 15 can be a heated roll.
  • All guide rolls 15 can be heated rolls.
  • Temperatures of smoothing press are around 50 - 300 °C, preferably 70 - 170 °C. If needed, there can be also some auxiliary heating means 23 for the rolls 13, 15.
  • the auxiliary heating means can include, for example infrared, resistive, inductive or gas-burner heater. There can be also a combination of the above mentioned heaters and the belt can also be heated.
  • the smoothing press 12 also has an own hood 16. In this way it is possible to independently control the smoothing press and runaway heat flows can be avoided. Also excess or extra moisture can be handled with removal of moist air.
  • the hood can also be common with the hood of the drying section.
  • FIG 1a there is an open draw from the press nip 10 to the smoothing press 12.
  • the tail threading is handled for example by ropes arranged to the side of the press section. However, vacuum belt conveyors and air blowings can be used.
  • Figures 1b , 2a and 2b between the press nip 10 and the smoothing press 12 there is a closed draw. This makes the tail threading more secure and the actual web-forming process is also stable.
  • the belt can be made of metal, for example of steel.
  • the thickness of the metal belt is about 1 mm.
  • the belt can be made also from other material. In this situation the belt has, for example, metallic coating for achieving as smooth surface of the belt as possible.
  • This kind of belt can be thicker than the metal belt.
  • the tension of the belt 14 is 3 - 15 kN/m, preferably 5 - 10 kN/m. The position and alignment of one or more guide rolls can be adjusted. Thus, the smoothing press can be controlled for every situation.
  • the web may dust during smoothing. Also fibres, fines, chemical deposit or stickies can stick to the surface of the rolls or belt.
  • cleaning equipments 17 which include high-pressure water cleaners preferably in connection with both the smoothing roll 13 and the belt 14. The cleaners are used continuously and bigger particles are removed with doctors 18. For better cleaning results the temperature of the cleaning medium can be risen close to 100 °C which also reduces the cooling effect of the cleaners.
  • the smoothing effect of the smoothing press is achieved by long wrap metal belt nip area together with smooth surfaces of the belt 14 and the smoothing roll 13, and heating.
  • the length of the nip is 500 - 2500 mm, preferably 1000 - 2000 mm.
  • the smoothing press 12 has a linear load which is 1 - 150 kN/m, preferably 5 - 100 kN/m.
  • This nip pressure can be adjusted for example by moving one guide roll.
  • the smoothing roll 13 can be equipped with a optional counter roll 20 which is arranged inside the belt 14 arranged as a loop. By loading the counter roll against the smoothing roll, the nip pressure is locally increased.
  • the counter roll is preferably a deflection compensated or tube roll.
  • the smoothing roll 13 is arranged into contact with the belt 14 between two guide rolls 15.
  • the rolls are situated in such a way that the smoothing roll 13 and the belt 14 form two gaps 19 which open downwards.
  • the gaps are under the loop which keeps the smoothing press clean if threading tail breaks. Also, if something else than the web enters into the closing gap, it will come out and fall underneath the smoothing press by way of gravity.
  • An other embodiment of the present invention shown in Figure 2b includes an impingement drying section 21 arranged between the press section and the smoothing press 12.
  • This drying section is for increasing the temperature of the web and decreasing the water content therein. Thus the smoothing process becomes more effective.
  • This web-preheating arrangement according to Figure 2b also enables less or no heating in the actual smoothing press.
  • the web is guided from the smoothing press to the drying section. Due to the smoothing press according to the invention the first drying cylinder can be warmer than previously. However, between the press nip 10 and the smoothing press 12 there can be at least one impingement drying section 21 as mentioned earlier. This increases the dry content and the smoothing press can be even warmer. In Figure 2b there is one horizontal impingement drying section while in Figure 2a there is also a vertical impingement drying section. Also the smoothing press can be followed by one or more impingement 22 drying sections, as shown in Figure 1b . With preheating, higher initial cylinder temperatures can be used in the drying section. This improves the drying capacity of the drying section as a whole. Also the improved smoothness of the web will increase the friction between drying cylinders and drying fabrics. This will improve the surface properties of the board especially in the edge areas.
  • the arrangement according to the invention is compact and it has many advantageous features. Due to the long wrap metal smoothing nip, the web has higher dry content than in the ordinary smoothing press. Also, the surfaces of both sides of the web are very similar. The components of this arrangement are simple so the founding costs are low. Also, there are only minor press felt markings on the web after leaving the smoothing press. The web has very good smoothness and bulk both after the press section and also for the end product. As mentioned earlier, this leads to improved contact between drying cylinders and drying fabrics. Also the drying shrinkage is reduced and the temperature transmission from drying cylinders to the web is improved. When the drying efficiency gets higher the production capacity can be improved or higher bulk can be achieved after the press section. When the smoothness is improved in the metal belt smoothing press there is less or no need for calendaring after the drying section. This leads to improved bending stiffness because the caliper of the web is improved.
  • the press section has few press nips.
  • the structure of the press section is thus simple which improves the runnability of the press section and reduces the investment costs. This gives a short payback period for the smoothing press arrangement according to the invention. Also, the space needed for the press section is reduced.
  • the metal belt smoothing press has also effect on the strength properties of the end product.
  • the smoothing press also changes the surface properties of the web. Also, it is possible to adjust the temperatures of the sides of the paper or board in the smoothing press. Hence, it is easy to change the sidedness of the paper or board.
  • higher initial cylinder temperature can be used in the drying section without fibre picking and dusting or linting problems.
  • the press section is intended for dewatering and/or processing paper of board webs.
  • the paper or board has no warpages or curlings and it has a good stiffness.
  • the heating means or heat carrying means or cleaning equipments includes one or more suitable device for heating, heat carrying or cleaning, respectively.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (17)

  1. Dispositif pour la section des presses d'une machine de formation de feuille continue, lequel dispositif comprend
    - au moins une zone de pincement (10) pour essorer la feuille continue (11) fabriquée dans une machine de formation de feuille continue,
    - une presse lisseuse (12) comprenant un rouleau lisseur (13) disposés après la zone de pincement (10), et
    - des moyens lisses de transfert de chaleur disposés en boucle autour des rouleaux guides (15), où le rouleau lisseur (13) et/ou au moins un des rouleaux guides (15) est un rouleau à déviation compensée,
    caractérisé en ce que les moyens lisses de transfert de chaleur (14') se composent d'une courroie (14) faite en partie ou complètement de métal et disposée en boucle autour de deux ou trois rouleaux guides (15), en ce que le rouleau lisseur (13) est disposé en contact avec la courroie (14) entre deux rouleaux guides (15), et en ce que le rouleau lisseur (13) et/ou au moins un des rouleaux guides (15) peut être chauffé.
  2. Dispositif selon la revendication 1, caractérisé en ce que la presse lisseuse (12) est disposée dans le sens du déplacement de la feuille continue (11) quand la siccité de la feuille continue (11) est de 45 % ou plus, mais avant une sécherie à cylindre qui appartient à la machine de formation de feuille continue.
  3. Dispositif selon la revendication 2, caractérisé en ce que la siccité de la feuille continue (11) est de 55 % ou plus.
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le rouleau lisseur (13) et/ou au moins un des rouleaux guides (15) est disposé de sorte à être chauffé par un milieu chauffant ou par des moyens de chauffage par infrarouge, par résistance, par induction ou alimenté au gaz.
  5. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que tous les rouleaux guides (15) peuvent être chauffés.
  6. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le diamètre du rouleau lisseur (13) et/ou du rouleau guide (15) est de 1000 à 2500 mm, de préférence de 1300 à 2000 mm.
  7. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la presse lisseuse (12) a son propre capot (16).
  8. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la tension de la courroie (14) est de 3 à 15 kN/m, de préférence de 5 à 10 kN/m.
  9. Dispositif selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'en liaison à la fois avec le rouleau lisseur (13) et la courroie (14) il y a des appareils de nettoyage (17) qui comprennent des nettoyeurs à eau à haute pression.
  10. Dispositif selon l'une quelconque des revendications 1 à 9, caractérisé en ce que la presse lisseuse (12) a une charge linéaire qui est de 1 à 150 kN/m, de préférence de 5 à 100 kN/m.
  11. Dispositif selon l'une quelconque des revendications 1 à 10, caractérisé en ce que le rouleau lisseur (13) a un contre-rouleau (20) qui est disposé à l'intérieur de la courroie (14) disposée en boucle, et que le contre-rouleau (20) est de préférence un rouleau à déviation compensée.
  12. Dispositif selon l'une quelconque des revendications 1 à 11, caractérisé en ce que le rouleau lisseur (13) et la courroie (14) forment deux ouvertures (19) qui s'ouvrent vers le bas.
  13. Dispositif selon l'une quelconque des revendications 1 à 12, caractérisé en ce qu'en liaison avec la presse lisseuse (12) il y a des moyens de chauffage auxiliaires (23) pour chauffer la feuille continue (11) et/ou les moyens lisses de transfert de chaleur (14').
  14. Dispositif selon l'une quelconque des revendications 1 à 13, caractérisé en ce qu'entre la zone de pincement (10) et la presse lisseuse (12) il y un parcours fermé.
  15. Dispositif selon l'une quelconque des revendications 1 à 14, caractérisé en ce qu'il comprend en outre entre la zone de pincement (10) et la presse lisseuse (12) au moins une section de séchage par impact (21).
  16. Dispositif selon l'une quelconque des revendications 1 à 15, caractérisé en ce qu'il comprend en outre immédiatement après la presse lisseuse (12) au moins une section de séchage par impact (22).
  17. Dispositif selon l'une quelconque des revendications 1 à 16, caractérisé en ce que le dispositif est prévu pour essorer et transformer des feuilles continues de papier ou de carton.
EP07150200A 2007-12-20 2007-12-20 Agencement pour la section de pressage d'une machine de fabrication d'une bande de matériau Not-in-force EP2072672B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07150200A EP2072672B1 (fr) 2007-12-20 2007-12-20 Agencement pour la section de pressage d'une machine de fabrication d'une bande de matériau
AT07150200T ATE518989T1 (de) 2007-12-20 2007-12-20 Anordnung für die pressenpartie einer maschine zur herstellung einer materialbahn
CN2008101778058A CN101463575B (zh) 2007-12-20 2008-12-01 与幅材成形机的压榨部相关的设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07150200A EP2072672B1 (fr) 2007-12-20 2007-12-20 Agencement pour la section de pressage d'une machine de fabrication d'une bande de matériau

Publications (2)

Publication Number Publication Date
EP2072672A1 EP2072672A1 (fr) 2009-06-24
EP2072672B1 true EP2072672B1 (fr) 2011-08-03

Family

ID=39387115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07150200A Not-in-force EP2072672B1 (fr) 2007-12-20 2007-12-20 Agencement pour la section de pressage d'une machine de fabrication d'une bande de matériau

Country Status (3)

Country Link
EP (1) EP2072672B1 (fr)
CN (1) CN101463575B (fr)
AT (1) ATE518989T1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2072671B1 (fr) * 2007-12-20 2011-08-17 Stora Enso Oyj Agencement pour la section de pressage d'une machine de fabrication d'une bande de matériau, et carton ou papier produit dans un tel agencement
DE102010031450A1 (de) * 2010-07-16 2012-01-19 Voith Patent Gmbh Verfahren und Maschine zur Herstellung einer Faserstoffbahn
EP2549013B1 (fr) * 2011-07-21 2018-01-31 Valmet Technologies, Inc. Procédé et agencement pour produire une bande de matériau fibreux
AT522784B1 (de) * 2020-02-25 2021-02-15 Andritz Ag Maschf Vorrichtung und verfahren zum herstellen einer faserstoffbahn

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19636627A1 (de) 1996-09-10 1998-03-12 Voith Sulzer Papiermasch Gmbh Glättvorrichtung und Verfahren zur Glättung einer Papierbahn
FI20020159A (fi) * 2002-01-29 2003-07-30 Metso Paper Inc Pinnan muokkauslaite ja laitetta käyttävä menetelmä päällystetyn tai päällystämättömän kuiturainan viimeistelemiseksi
DE102005021106A1 (de) 2005-05-06 2006-11-09 Voith Patent Gmbh Glättanordnung
FI20065447L (fi) * 2006-06-28 2007-12-29 Metso Paper Inc Paperi- tai kartonkikoneen puristinosa

Also Published As

Publication number Publication date
CN101463575A (zh) 2009-06-24
EP2072672A1 (fr) 2009-06-24
CN101463575B (zh) 2012-04-25
ATE518989T1 (de) 2011-08-15

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