EP2722437B1 - Procédé de déshydratation et de pressage de bande et appareil de compression pour machine de fabrication de papier ou de carton - Google Patents

Procédé de déshydratation et de pressage de bande et appareil de compression pour machine de fabrication de papier ou de carton Download PDF

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Publication number
EP2722437B1
EP2722437B1 EP12189019.8A EP12189019A EP2722437B1 EP 2722437 B1 EP2722437 B1 EP 2722437B1 EP 12189019 A EP12189019 A EP 12189019A EP 2722437 B1 EP2722437 B1 EP 2722437B1
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EP
European Patent Office
Prior art keywords
web
belt
pressure
pressing
chamber
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
EP12189019.8A
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German (de)
English (en)
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EP2722437A1 (fr
Inventor
Riku Pihko
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
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Valmet Technologies Oy
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Publication date
Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Priority to EP12189019.8A priority Critical patent/EP2722437B1/fr
Priority to CN201310477090.9A priority patent/CN103774485B/zh
Publication of EP2722437A1 publication Critical patent/EP2722437A1/fr
Application granted granted Critical
Publication of EP2722437B1 publication Critical patent/EP2722437B1/fr
Not-in-force legal-status Critical Current
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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
    • 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
    • D21F3/0209—Wet presses with 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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • 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
    • D21F3/0272—Wet presses in combination with suction or blowing devices

Definitions

  • the invention pertains to a web pressing and dewatering method and to a pressing apparatus for a paper- or board-making machine for removing fluids from a web, according to the preambles of claims 1 and 11, respectively, the features of which are known from document DE 31 05 276 A1 .
  • Document WO 2009 024 186 A1 discloses a pressing apparatus for a paper- or board-making machine for removing fluids from a web by pressing.
  • the disclosed pressing apparatus comprises at least one belt which guides the web.
  • the belt is impervious to fluids and forms an endless loop.
  • At least one nip is formed between a press roll and a pressure means of the pressing apparatus.
  • the guided web is arranged to pass through the nip.
  • the pressure means comprises at least one pressure chamber containing a pressure medium and extending along the length of the nip in the web moving direction such that the pressure medium directly contacts the belt.
  • the pressure chamber has a pressure-operated sealing member which cooperates with the belt, and the sealing operating pressure is adjusted in accordance with the pressure acting in the pressure chamber.
  • a web pressing and dewatering method uses a pressing apparatus for a paper- or board-making machine for removing fluids from a web by pressing, and the pressing apparatus comprises at least one belt adapted to guide the web, and the belt is impervious to fluids and forms an endless loop; a press roll and a pressure means forming a press nip by wrapping the belt about a circumferential portion of the press roll, through which press nip the guided web is arranged to pass; the pressure means comprises a pressure chamber separated into at least two separating portions each of which comprise a particular pressure medium; the pressure chamber extends along the length of the press nip in the web moving direction such that the particular pressure medium directly contacts the belt; the pressing is performed by using different pressure media in each of the at least two separating portions of the pressure chamber.
  • one of the different media can be a gaseous fluid and another of the different media can be a liquid fluid.
  • Using a gaseous fluid enables to achieve a quite low pressure in a quite large area, while using a liquid fluid achieves a quite large pressure in a comparably small area of the metal belt.
  • a first separating portion in a running direction of the web can contain steam as pressure medium and a second separating portion in the running direction of the web can contain water as pressure medium.
  • Using steam as a pressure medium has the additional advantage that the heat of the steam can be also used for heating the metal belt. Furthermore, steam as well as water are readily available and can be easily handled.
  • the length of the press nip formed between the press roll and the belt wrapped by the pressure means, or the length of the press nip formed between the press roll and the portion of the belt corresponding to a first separating portion in a running direction of the web can be between 200 mm to 1000 mm or between 400 mm and 800 mm. Furthermore, the length of the press nip between the press roll and the portion of the belt corresponding to a second separating portion in a running direction of the web can be between 50 mm and 500 mm or between 100 mm and 500 mm. A diameter of the press roll can be between 1200 mm and 2200 mm.
  • a minimum length of the complete press nip is about 500 mm. Thereby, about a quarter of the circumference of the press roll is required for forming the press nip.
  • a pressure of the pressure medium in a first separating portion in a running direction of the web can be between 0.1 and 1 MPa, or between 0.4 and 1 MPa or between 0.4 and 0.6 MPa. Additionally or alternatively a pressure of the pressure medium in a second separating portion in a running direction of the web can be between 1 and 10 MPa or between 4 and 8 MPa.
  • the web can be exposed to warm air blown towards the belt, after having passed through the press nip. This improves a required dry content of the web.
  • the separation between the at least two separating portions can be effected by a pressure-operated sealing member cooperating with the belt.
  • the sealing operating pressure can then be adjusted in accordance with the respective pressures acting in the at least two portions of the pressure chamber.
  • pressures in the at least two separating portions can be different from each other and can be freely controlled.
  • the press roll can be a grooved roll.
  • heating means can be used for maintaining a belt temperature within the press nip constant or for increasing the belt temperature within the press nip.
  • a heat of the pressure medium in at least one of the separating portions can be used for heating the metal belt to maintain its temperature constant in the press nip or to increase its temperature in the press nip.
  • the temperature of the belt in the press nip can be between 97° C and 115° C.
  • a pressing apparatus for a paper- or board-making machine for removing fluids from a web by pressing according to claim 11 is provided.
  • the apparatus according to the invention is in particular suitable for performing the above mentioned method steps.
  • doctors can be provided before the steam pipes, said doctors serving to remove remaining fluids from the belt.
  • slipping of the belt advantageously can be prevented.
  • a pumping means being adapted to pump a condensate from the steam chamber to the hot water chamber via connecting means can be provided.
  • a size of the steam chamber can be between one and ten decimal powers larger than that of the hot water chamber.
  • a comparably low pressure in a comparably large area can be provided in the area of the press nip affected by the steam chamber.
  • the temperature of the belt can be accurately adjusted as needed.
  • the temperature of the web being at about 30° C to 40° C when entering the nip formed between the roll and the belt, can be suitable raised to a desired level.
  • the temperature can be raised up to 100° C or more, in particular, if a metal belt is used. In this case, the metal belt temperature is raised to about 100° C to 120° C.
  • At least one of the chamber walls arranged in parallel to a running direction of the belt can comprise a door or the chamber wall can be completely opened.
  • Friction heat caused by moving mechanical parts in one of the separating portions containing a liquid pressure medium can be transferred via the liquid pressure medium to the belt for heating the same.
  • an effective use of waste heat is possible.
  • the belt can be made of metal or synthetic or a ceramic material or of a combination of two or more of these.
  • a press felt can be guided about the press roll in order to absorb/arrange void volume for water.
  • FIGS. 1 to 4 A presently preferred embodiment of the invention will be described on basis of FIGS. 1 to 4 .
  • FIG. 1 shows a sectional view of a pressing apparatus according to the invention.
  • a press nip is formed by a belt 1 forming an endless loop between a press section (on the left side in FIG. 1 ) and a dryer section (on the right side in FIG. 1 ) of the paper or board making machine.
  • a press roll 3 is arranged such that a portion of the belt 1 is wrapped about a circumference portion of the press roll 3 in order to form a press nip.
  • FIG. 1 elements pertaining to the press section as well as to the dryer section but not directly related to the invention are drawn with dashed lines.
  • the web In order to guide a web W entering from a press nip formed between a roll 29 supporting the belt 1 and a second roll shown in dashed lines, the web is taken over by the belt 1 to be guided to the press nip formed between the press roll 3 and the belt 1. Furthermore, in order for sufficiently remove liquid contained in the web, such as water, a felt 37 is also guided about the press roll 3. Subsequent to the press roll 3, the web is further guided via a drying means 31 towards a first roll shown in dashed lines of a dryer section taking the web over from the belt 1 and guiding the web W further by means of a wire. Thereafter, the belt 1 is further guided about guiding rolls 25 and 27 to form the endless loop.
  • a drying means 31 towards a first roll shown in dashed lines of a dryer section taking the web over from the belt 1 and guiding the web W further by means of a wire.
  • a diameter of supporting roll 29 is between 800 mm to 1500 mm.
  • An air dryer 31 is provided after the press nip in order to further reduce the moisture content of the web W.
  • support elements 33 and 35 arranged between the press nip and the dryer section of the paper or board making machine are provided within the closed loop of the belt 1 to reduce vibrations of the belt 1.
  • two pressure chambers 9 and 11 are provided inside of the closed loop of the belt 1 in order to affect a press force on the inner side of the belt 1.
  • a first pressure chamber 9 in the running direction of the belt/web is a steam chamber, while a second pressure chamber 11 is a water chamber.
  • steam chamber and water chamber pertain to the particular pressure medium used in the respective chambers. It is advantageous to arrange water medium temperature to be over 80° C to reduce thermal effects between the chambers. Furthermore, chambers can also be separated with thermal insulation, sliding joint or air chamber (with equivalent pressure) to reduce said structural changes at least with higher temperature difference.
  • the steam chamber as well as the water chamber can be guided to get into abutment with the inner side of the closed loop of the belt 1 as is schematically shown by double arrows in FIG. 1 .
  • the two pressure chambers 9, 11 can be retracted. Therefore, the steam chamber 9 as well as the water chamber 11 is supported on respective supports 41, 39.
  • the steam chamber comprises plural steam pipes 15 having respective outlets towards the inside of the closed loop of the belt 1.
  • steam is supplied from the steam pipes 15 towards the belt 1.
  • each steam pipe 15 is provided with a doctor blade 17, which serves to remove the condensate steam from the inner side of the belt 1 in order to improve the effect of the steam applied onto the inner side of the closed belt loop from the subsequent steam pipe 15.
  • the condensate steam dropping to the floor of steam chamber 9 is removed via a condensate removal pipe 43 by means of a pump 19 pumping the condensate steam into the water chamber 11.
  • a pump 19 pumping the condensate steam into the water chamber 11.
  • the steam chamber 9 is supported by a support beam 41.
  • a door is provided (not shown in the figures), in order to enable access to the steam chamber for maintenance purpose etc.
  • the already mentioned water chamber 11 is provided as a second pressure chamber. While in FIG. 2 water supplied to the water chamber 11 is merely shown by means of the condensate removal pipe 43 and pump 19, additional pumps and piping for supplying water to the water chamber 11 can be additionally provided.
  • Hydraulic seals 13 are provided at the boundaries of the water chamber 11 as well as on the boundaries of the steam chamber 9 in order to keep the pressure at the desired level.
  • these hydraulic seals 13 are made of PTFE or of carbon fiber reinforced plastics.
  • FIG. 3 is a schematic sketch showing the dimensional properties of the press nip formed between the press roll 3 and the belt 1.
  • the section I corresponds to the steam chamber 9 and the section II corresponds to the water chamber 11.
  • the length of the nip in section I is about 100 to 1000 mm, while the pressure achieved due to the steam pipes is between 1 and 10 bar (0.1 to 1 MPa).
  • the length of the press nip is between 100 and 500 mm, while the pressure achieved due to the water pressure is between 10 bars to 100 bars (1 to 10 MPa).
  • a diameter of the roll 3 is chosen such that an angle ⁇ of the roll segment forming the complete press nip is about 90°.
  • FIG. 4 shows a pressure distribution in the press nip of a preferred example of the embodiment.
  • the length dimension I1 of the press nip in section I is 700 mm, while the length dimension I2 in section II is 500 mm.
  • the pressure gained in section I is 4 bars to 6 bars, while the pressure gained in section II is 40 bars to 80 bars (section I 0.4 to 0.6 MPa; section II 4 to 8 MPa).
  • seals 13 are provided as elastic seals, even comparably large particles up to 1600 g/m 2 present in the web do not cause a risk for damaging the press nip.
  • a coated metal belt is used as belt 1 and especially with sticky furnishes (like fine paper, FBB, ).
  • FBB sticky furnishes
  • a comparably high temperature of about 100° C instead of 75° C as known from the prior art can be provided.
  • the web temperature at the inlet of the press nip is about 30° C to 40° C, while the metal belt temperature in that area is about 100° C to 120° C.
  • the arrangement according to the invention keeps the web 5 - 20° C warmer in the nip than prior art solution where a stream chamber is arranged before the press nip.
  • belt 1 can be provided as coated and/or as heated belt.
  • felt 37 is used.
  • felt 37 it is advantageous to use felt 37 together with a grooved roll as press roll 3 or to use merely a grooved roll as press roll.
  • a pressure of about 2 bars (0.2 MPa) can be achieved in such a press nip.
  • a wrapped nip force of 80 kN/m to 160 kN/m showing good web heating properties can be achieved.
  • tests of the pressure apparatus according to the invention lead to that a dry content increase of 8 % compared to prior art roll nips can be achieved. Furthermore, since the seals of the steam chamber are flexible, a good resistance against paper webs of web brake can be achieved. Thus, the invention is in particular suitable for heavy grade webs.

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Claims (15)

  1. Procédé de pressage et de déshydratation de bande en utilisant un appareil de pressage pour une machine de fabrication de papier ou de carton pour retirer des fluides d'une bande par pressage, l'appareil de pressage comprenant :
    au moins une courroie (1) adaptée pour guider la bande (W), où la courroie (1) est imperméable aux fluides et forme une boucle sans fin,
    un rouleau de presse (3) et un moyen de pression (7) formant une ligne de contact de presse en enroulant la courroie (1) autour d'une partie circonférentielle du rouleau de presse (3), à travers laquelle ligne de contact de presse la bande guidée (W) est agencée pour passer, où
    le moyen de pression comprend une chambre de pression (7) séparée en au moins deux parties de séparation (9, 11) dont chacune comprend un agent de pression particulier, la chambre de pression (7) s'étendant sur la longueur de la ligne de contact de presse dans la direction de déplacement de la bande (W) de sorte que l'agent de pression particulier entre directement en contact avec la courroie (1),
    caractérisé en ce que
    le pressage est effectué eu utilisant différents agents de pression dans chacune des au moins deux parties de séparation (9, 11) de la chambre de pression (7).
  2. Procédé de pressage et de déshydratation de bande selon la revendication 1, dans lequel l'un des différents agents est un fluide gazeux et un autre agent des différents agents est un fluide liquide.
  3. Procédé de pressage et de déshydratation de bande selon l'une des revendications précédentes, dans lequel une première partie de séparation (9) dans une direction de défilement de la bande contient de la vapeur en tant qu'agent de pression et une deuxième partie de séparation (11) dans la direction de défilement de la bande (W) contient de l'eau en tant qu'agent de pression.
  4. Procédé de pressage et de déshydratation de bande selon l'une des revendications précédentes, dans lequel la longueur de la ligne de contact de presse formée entre le rouleau de presse (3) et la courroie (1) enroulée par le moyen de pression (7), ou la longueur de la ligne de contact de presse formée entre le rouleau de presse (3) et la partie de la courroie (1) correspondant à une première partie de séparation (9) dans une direction de défilement de la bande est comprise entre 200 mm et 1000 mm ou entre 400 mm et 800 mm, et/ou
    la longueur de la ligne de contact de presse entre le rouleau de presse (3) et la partie de la courroie correspondant à une deuxième partie de séparation (11) dans une direction de défilement de la bande est comprise entre 50 mm et 500 mm ou entre 100 mm et 500 mm, et/ou un diamètre du rouleau de presse (3) est compris entre 1200 mm et 2200 mm.
  5. Procédé de pressage et de déshydratation de bande selon l'une des revendications précédentes, dans lequel une pression de l'agent de pression dans une première partie de séparation (9) dans une direction de défilement de la bande (W) est comprise entre 0,1 et 1 MPa, ou entre 0,4 et 1 MPa ou entre 0,4 et 0,6 MPa, et/ou où une pression de l'agent de pression dans une deuxième partie de séparation (11) dans une direction de défilement de la bande (W) est comprise entre 1 et 10 MPa ou entre 4 et 8 MPa.
  6. Procédé de pressage et de déshydratation de bande selon l'une des revendications précédentes, dans lequel la bande (W) est exposée à l'air chaud soufflé vers la courroie, après avoir traversée la ligne de contact de presse.
  7. Procédé de pressage et de déshydratation de bande selon l'une des revendications précédentes, dans lequel la séparation entre les au moins deux parties de séparation (9, 11) est effectuée par un élément d'étanchéité actionné par pression (13) coopérant avec la courroie, et
    la pression d'actionnement d'étanchéité est réglée en fonctions des pressions respectives agissant dans les au moins deux parties (9, 11) de la chambre de pression, et/ou
    les pressions dans les au moins deux parties de séparation (9, 11) sont différentes les unes des autres et sont librement régulées.
  8. Procédé de pressage et de déshydratation de bande selon l'une des revendications précédentes, dans lequel le rouleau de presse (3) est un rouleau rainuré (3).
  9. Procédé de pressage et de déshydratation de bande selon l'une des revendications précédentes, dans lequel des moyens de chauffage (15) sont utilisés pour maintenir une température de courroie à l'intérieur de la ligne de contact de presse constante ou pour augmenter la température de courroie à l'intérieur de la ligne de contact de presse.
  10. Procédé de pressage et de déshydratation de bande selon la revendication 9, dans lequel une chaleur de l'agent de pression dans au moins l'une des parties de séparation (9) est utilisée pour chauffer la courroie métallique (1) pour maintenir sa température constante dans la ligne de contact de presse ou pour augmenter sa température dans la ligne de contact de presse, et/ou
    la température de la courroie (1) dans la ligne de contact de presse est comprise entre 97°C et 115°C
  11. Appareil de pressage pour une machine de fabrication de papier ou de carton pour retirer des fluides d'une bande (W) par pressage, comprenant :
    au moins une courroie (1) qui guide la bande (W), où la courroie (1) est imperméable aux fluides et forme une boucle sans fin,
    au moins une ligne de contact, qui est formée entre un rouleau de presse (3) et un moyen de pression (7), et à travers laquelle ligne de contact la bande guidée (W) est agencée pour passer, où
    le moyen de pression (7) comprend au moins deux parties de pression (9, 11), dont chacune contient un agent de pression particulier et s'étendant sur la longueur de la ligne de contact dans la direction de déplacement de la bande de sorte que chaque agent de pression particulier soit capable d'entrer directement en contact avec la courroie (1), et
    le moyen de pression (7) a un élément d'étanchéité (13) qui coopère avec la courroie (1),
    caractérisé en ce que
    une partie de pression (9) des au moins deux parties de pression est une chambre de vapeur (9) adaptée pour comprendre de la vapeur chaude comme étant l'agent de pression particulier et ayant au moins deux tuyaux de vapeur (15) agencés dans une direction transversale de la courroie, lesdits tuyaux de vapeur (15) étant capables de fournir un flux de vapeur dirigé vers la courroie, et en ce que
    une deuxième partie (11) des au moins deux parties de pression est une chambre d'eau chaude (11) adaptée pour comprendre de l'eau chaude comme étant l'agent de pression.
  12. Appareil de pressage selon la revendication 11, dans lequel des docteurs (17) sont prévus avant les tuyaux de vapeur (15), lesdits docteurs servant à retirer les fluides restants de la courroie (1).
  13. Appareil de pressage selon la revendication 11 ou 12, dans lequel un moyen de pompage (19) étant adapté pour pomper un condensat à partir de la chambre de vapeur (9) vers la chambre d'eau chaude par l'intermédiaire d'un moyen de connexion (21) est prévu.
  14. Appareil de pressage selon la revendication 13, dans lequel la taille de la chambre de vapeur (9) est comprise entre un et dix puissances de dix p celle de la chambre d'eau chaude (11).
  15. Appareil de pressage selon la revendication 11 à 14, dans lequel au moins l'une des parois de chambre agencée en parallèle à une direction de défilement de la courroie (1) comprend une porte ou la paroi de chambre peut être complètement ouverte.
EP12189019.8A 2012-10-18 2012-10-18 Procédé de déshydratation et de pressage de bande et appareil de compression pour machine de fabrication de papier ou de carton Not-in-force EP2722437B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12189019.8A EP2722437B1 (fr) 2012-10-18 2012-10-18 Procédé de déshydratation et de pressage de bande et appareil de compression pour machine de fabrication de papier ou de carton
CN201310477090.9A CN103774485B (zh) 2012-10-18 2013-10-14 幅材压榨和脱水方法以及造纸机或纸板机的压榨设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12189019.8A EP2722437B1 (fr) 2012-10-18 2012-10-18 Procédé de déshydratation et de pressage de bande et appareil de compression pour machine de fabrication de papier ou de carton

Publications (2)

Publication Number Publication Date
EP2722437A1 EP2722437A1 (fr) 2014-04-23
EP2722437B1 true EP2722437B1 (fr) 2016-01-13

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CN (1) CN103774485B (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2629203T5 (es) * 2014-11-26 2023-02-24 Billerudkorsnaes Ab Método de producción de un cartón corrugado para empaque a partir de pasta que comprende pasta NSSC
FI127892B (en) 2016-10-05 2019-05-15 Teknologian Tutkimuskeskus Vtt Oy Method and apparatus for producing elongated fiber products
FI20185538A1 (en) 2018-06-13 2019-12-14 Teknologian Tutkimuskeskus Vtt Oy Method and apparatus for producing a high bulk web

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH563867A5 (fr) * 1973-03-01 1975-07-15 Escher Wyss Gmbh
AT380907B (de) * 1981-01-27 1986-07-25 Escher Wyss Gmbh Nasspresse mit verlaengertem pressspalt fuer papiermaschinen
FI70952C (fi) * 1982-10-14 1986-10-27 Valmet Oy Anordning med laong presszon vid pressbehandling av fiberbana
DE102005057861A1 (de) * 2005-12-03 2007-06-06 Voith Patent Gmbh Dichtungsanordnung
CN101778975B (zh) * 2007-08-21 2013-09-18 美卓造纸机械公司 通过压榨从幅材中移除流体的造纸机或纸板机的压榨设备及在造纸机或纸板机中处理幅材的方法

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CN103774485A (zh) 2014-05-07
CN103774485B (zh) 2016-02-24
EP2722437A1 (fr) 2014-04-23

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