EP2722437B1 - Bahnpress- und -entwässerungsverfahren und Pressvorrichtung für eine Papier- und Kartonherstellungsmaschine - Google Patents

Bahnpress- und -entwässerungsverfahren und Pressvorrichtung für eine Papier- und Kartonherstellungsmaschine 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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English (en)
French (fr)
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EP2722437A1 (de
Inventor
Riku Pihko
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Valmet Technologies Oy
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Valmet Technologies Oy
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Publication date
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Priority to EP12189019.8A priority Critical patent/EP2722437B1/de
Priority to CN201310477090.9A priority patent/CN103774485B/zh
Publication of EP2722437A1 publication Critical patent/EP2722437A1/de
Application granted granted Critical
Publication of EP2722437B1 publication Critical patent/EP2722437B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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. Bahnpress- und Entwässerungsverfahren unter Verwendung einer Pressvorrichtung für eine Papier- oder Kartonherstellungsmaschine zum Entfernen von Fluiden von einer Bahn durch Pressen, wobei die Pressvorrichtung hat:
    zumindest ein Band (1), das angepasst ist, die Bahn (W) zu führen, wobei das Band (1) undurchlässig für Fluide ist und eine endlose Schleife ausbildet,
    eine Presswalze (3) und ein Pressmittel (7), die durch Umhüllen des Bands (1) um einen Umfangsabschnitt der Presswalze (3) einen Pressspalt ausbilden, wobei durch den Pressspalt die geführte Bahn (W) angeordnet ist, um durchzutreten, wobei
    das Pressmittel eine Presskammer (7), die in zumindest zwei Trennabschnitte (9, 11) getrennt ist, die jeweils ein bestimmtes Druckmedium umfassen, wobei die Presskammer (7) sich entlang der Länge des Pressspalts in der Bahn (W)-Bewegungsrichtung derart erstreckt, dass das bestimmte Druckmedium direkt das Band (1) berührt,
    dadurch gekennzeichnet, dass
    das Pressen unter Verwendung von verschiedenen Druckmedien in jedem der zumindest zwei Trennabschnitte (9, 11) der Presskammer (7) durchgeführt wird.
  2. Bahnpress- und Entwässerungsverfahren nach Anspruch 1, wobei eines der unterschiedlichen Medien ein gasförmiges Fluid und ein anderes der unterschiedlichen Medien ein flüssiges Fluid ist.
  3. Bahnpress- und Entwässerungsverfahren nach einem der vorangehenden Ansprüche, wobei ein erster Trennabschnitt (9) in einer Laufrichtung der Bahn Dampf als Druckmedium enthält, und ein zweiter Trennabschnitt (11) in der Laufrichtung der Bahn (W) Wasser als Druckmedium enthält.
  4. Bahnpress- und Entwässerungsverfahren nach einem der vorangehenden Ansprüche, wobei die Länge des zwischen der Presswalze (3) und dem Band (1), der durch das Pressmittel (7) umhüllt ist, oder die Länge des Pressspalts, der zwischen der Presswalze (3) und dem Abschnitt des Bands (1) entsprechend einem ersten Trennabschnitt (9) in einer Laufrichtung der Bahn ausgebildet ist, zwischen 200 mm bis 1000 mm oder zwischen 400 mm bis 800 mm beträgt, und/oder
    die Länge des Pressspalts zwischen der Presswalze (3) und dem Abschnitt des Bands entsprechend einem zweiten Trennabschnitt (11) in einer Laufrichtung der Bahn zwischen 50 mm und 500 mm oder zwischen 100 mm und 500 mm liegt, und/oder
    ein Durchmesser der Presswalze (3) zwischen 1200 mm und 2200 mm liegt.
  5. Bahnpress- und Entwässerungsverfahren nach einem der vorangehenden Ansprüche, wobei ein Druck des Druckmediums in einem ersten Trennabschnitt (9) in einer Laufrichtung der Bahn (W) zwischen 0,1 und 1 MPa oder zwischen 0,4 und 1 MPa oder zwischen 0,4 und 0,6 MPa liegt, und/oder wobei ein Druck des Druckmediums in einem zweiten Trennabschnitt (11) in einer Laufrichtung der Bahn (W) zwischen 1 und 10 MPa oder zwischen 4 und 8 MPa liegt.
  6. Bahnpress- und Entwässerungsverfahren nach einem der vorangehenden Ansprüche, wobei die Bahn (W) zu warmer Luft freigelegt ist, die zu dem Band geblasen wird, nachdem sie durch den Pressspalt durchgetreten ist.
  7. Bahnpress- und Entwässerungsverfahren nach einem der vorangehenden Ansprüche, wobei die Trennung zwischen den zumindest zwei Trennabschnitten (9, 11) durch ein druckbetätigtes Dichtelement (13) bewirkt wird, das mit dem Band zusammenwirkt, und
    der Dichtbetätigungsdruck gemäß den entsprechenden Drücken angepasst wird, die in den zumindest zwei Abschnitten (9, 11) der Presskammer wirken, und/oder
    Drücke in den zumindest zwei Trennabschnitten (9, 11) voneinander unterschiedlich und frei gesteuert sind.
  8. Bahnpress- und Entwässerungsverfahren gemäß einem der vorangehenden Ansprüche, wobei die Presswalze (3) eine Walze (3) mit Nuten ist.
  9. Bahnpress- und Entwässerungsverfahren nach einem der vorangehenden Ansprüche, wobei Heizmittel (15) zum Beibehalten einer Bandtemperatur innerhalb des Pressspalts konstant oder zum Erhöhen der Bandtemperatur innerhalb des Pressspalts verwendet werden.
  10. Bahnpress- und Entwässerungsverfahren nach Anspruch 9, wobei eine Wärme des Druckmediums in zumindest einem der Trennabschnitte (9) zum Heizen des Metallbands (1) verwendet wird, um dessen Temperatur in dem Pressspalt konstant zu halten oder dessen Temperatur in dem Pressspalt zu erhöhen, und/oder
    die Temperatur des Bands (1) in dem Pressspalt zwischen 97°C und 115°C liegt.
  11. Pressvorrichtung für eine Papier- oder Kartonherstellungsmaschine zum Entfernen von Fluiden von einer Bahn (W) durch Pressen, mit:
    zumindest einem Band (1), das die Bahn (W) führt, wobei das Band (1) undurchlässig für Fluide ist und eine endlose Schleife ausbildet,
    zumindest einem Spalt, der zwischen einer Presswalze (3) und einem Druckmittel (7) ausgebildet ist, und durch welchen Spalt die geführte Bahn (W) angeordnet ist, geführt zu werden, wobei
    das Pressmittel (7) zumindest zwei Pressabschnitte (9, 11) umfasst, von denen jeder ein bestimmtes Druckmedium enthält und sich entlang der Länge des Spalts in der Bahnbewegungsrichtung derart erstreckt, dass jedes bestimmte Druckmedium in der Lage ist, das Band (1) direkt zu berühren, und
    das Pressmittel (7) ein Dichtelement (13) aufweist, das mit dem Band (1) zusammenwirkt,
    dadurch gekennzeichnet, dass
    ein Pressabschnitt (9) von den zumindest zwei Pressabschnitten eine Dampfkammer (9) ist, die angepasst ist, heißen Dampf als bestimmtes Druckmedium zu umfassen, und zumindest zwei Dampfrohre (15) in einer Querrichtung des Bands angeordnet aufweist, wobei die Dampfrohre (15) in der Lage sind, einen zu dem Band gerichteten Dampfstrom bereitzustellen, und dadurch, dass
    ein zweiter Abschnitt (11) der zumindest zwei Pressabschnitte eine Heißwasserkammer (11) ist, die angepasst ist, heißes Wasser als das Druckmedium zu enthalten.
  12. Pressvorrichtung nach Anspruch 11, wobei Rakeln (17) vor den Dampfrohren (15) bereitgestellt sind, wobei die Rakeln dienen, um verbleibende Fluide von dem Band (1) zu entfernen.
  13. Pressvorrichtung nach Anspruch 11 oder 12, wobei ein Pumpmittel (19) bereitgestellt ist, das angepasst ist, ein Kondensat von der Dampfkammer (9) über Verbindungsmittel (21) zu der Heißwasserkammer zu pumpen.
  14. Pressvorrichtung nach Anspruch 13, wobei eine Größe der Dampfkammer (9) zwischen ein und zehn Zehnerpotenzen größer als die der Heißwasserkammer (11) ist.
  15. Pressvorrichtung nach einem der Ansprüche 11 bis 14, wobei zumindest eine der Kammerwände, die parallel zu einer Laufrichtung des Bands (1) angeordnet sind, eine Tür umfassen, oder die Kammerwand vollständig geöffnet werden kann.
EP12189019.8A 2012-10-18 2012-10-18 Bahnpress- und -entwässerungsverfahren und Pressvorrichtung für eine Papier- und Kartonherstellungsmaschine Not-in-force EP2722437B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12189019.8A EP2722437B1 (de) 2012-10-18 2012-10-18 Bahnpress- und -entwässerungsverfahren und Pressvorrichtung für eine Papier- und Kartonherstellungsmaschine
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 (de) 2012-10-18 2012-10-18 Bahnpress- und -entwässerungsverfahren und Pressvorrichtung für eine Papier- und Kartonherstellungsmaschine

Publications (2)

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

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EP12189019.8A Not-in-force EP2722437B1 (de) 2012-10-18 2012-10-18 Bahnpress- und -entwässerungsverfahren und Pressvorrichtung für eine Papier- und Kartonherstellungsmaschine

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CN (1) CN103774485B (de)

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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 (de) * 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 (de) 2014-04-23

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