EP2022891A2 - Agencement de presse - Google Patents

Agencement de presse Download PDF

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Publication number
EP2022891A2
EP2022891A2 EP08154357A EP08154357A EP2022891A2 EP 2022891 A2 EP2022891 A2 EP 2022891A2 EP 08154357 A EP08154357 A EP 08154357A EP 08154357 A EP08154357 A EP 08154357A EP 2022891 A2 EP2022891 A2 EP 2022891A2
Authority
EP
European Patent Office
Prior art keywords
press
press nip
arrangement according
last
nip
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.)
Withdrawn
Application number
EP08154357A
Other languages
German (de)
English (en)
Other versions
EP2022891A3 (fr
Inventor
Georg Dr. Kleiser
Daniel Gronych
Robert Koplin
Klaus Hermann
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 EP2022891A2 publication Critical patent/EP2022891A2/fr
Publication of EP2022891A3 publication Critical patent/EP2022891A3/fr
Withdrawn legal-status Critical Current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
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip

Definitions

  • the invention relates to a press arrangement for dewatering a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same with at least two press nips, of which at least the first is made extended and a length of at least 100 mm has, wherein the first press nip in the web running direction is formed longer than the last press nip and the fibrous web runs together with at least one water-absorbing dewatering tape through the press nip.
  • the object of the invention is therefore to enable volume-saving dewatering of the fibrous web with a moisture profile that is as balanced as possible.
  • the object has been achieved in that the line force in the first press nip is higher than in the last press nip and the peak pressure in the first press nip is less than in the last press nip.
  • the volume of the fibrous web is significantly influenced by the last press nip, it suffices the line force in the last Pressing gap in the interest of a high volume of the fibrous web relatively low, at least less than to set in the first press nip.
  • the last press nip significantly influences the dry content and the moisture cross profile of the fibrous web. Due to a relatively high peak pressure in the last press nip, the moisture transverse profile of the fibrous web can be considerably improved, i. be equalized.
  • the peak pressure here is the maximum prevailing pressure in the press nip.
  • the pressure in the extended press nip increases rapidly in the web running direction and then decreases even faster after reaching the peak pressure.
  • the length of the first press nip should be between 120 and 800 mm, preferably between 150 and 500 mm.
  • the length of the last press nip is less than 350 mm, preferably less than 300 mm and in particular less than 250 mm. However, the length of the last press nip should be at least 10 mm for a sufficient leveling of the moisture cross profile of the fibrous web.
  • the line force in the first press nip should be between 100 and 3000 kN / m, preferably between 150 and 2000 kN / m.
  • the line force in the last press nip should be relatively low, the height depending on the residence time of the fibrous web in this press nip.
  • the line force in the last press nip should be less than 1500 kN / m, preferably less than 1200 kN / m and in particular less than 800 kN / m. However, so that the last press nip can exert its effect on the dewatering and moisture distribution, the line force in the last press nip should be at least 100 kN / m, preferably at least 200 kN / m and in particular at least 300 kN / m.
  • the last press nip is formed by two cylindrical press rolls.
  • the line force in the last press nip should be less than 200 kN / m, preferably less than 150 kN / m and in particular less than 130 kN / m, but at least 30 kN / m, preferably at least 40 kN / m and especially at least 50 kN / m amount.
  • the moisture transverse profile of the fibrous web can be influenced or equalized particularly effectively via the peak pressure in the last press nip, it is sufficient if the peak pressure in the first press nip is less than 8 MPa, preferably less than 7 MPa and in particular less than 6 MPa.
  • the peak pressure in the last press nip should be greater than 5 MPa, preferably greater than 6 MPa and in particular greater than 7 MPa.
  • the peak pressure in the last press nip should be at most 18 MPa.
  • the fibrous web should run together with both sides of at least one water-absorbing dewatering tape through the first press nip. This ensures drainage on both sides and ensures the safe absorption and removal of the water pressed out of the fibrous web via the water absorption capacity of the two drainage belts.
  • the fibrous web can also be passed through the last press nip together with at least one water-absorbing dewatering belt on both sides.
  • the dry content is usually already so high that it is sufficient if in the last press nip only one side of the fibrous web comes into contact with a water-absorbing dewatering belt and the other side of the fibrous web with a smoothing surface. This leads to drainage to the dewatering belt and a smoothing of the side in contact with the smoothing surface.
  • the smoothing surface can be formed by the smooth circumferential surface of a press roll involved in the press nip, or by a smooth transfer belt running endlessly around a press roll of the press nip.
  • the press arrangement in particular with regard to its drainage performance, it may be necessary that it comprises more than two press nips or has only two press nips.
  • FIGS. 1 to 6 different press arrangements with several press nips.
  • the first press nip is always extended executed. This means that its length in the web running direction 14 is at least 100 mm.
  • the extended press nip is formed in each case by a cylindrical press roll 8, 9, 11 and a shoe press roll 7, 10.
  • Shoe press rollers 7,10 have a flexible roll shell, which is pressed by a pressing element with concave pressing surface to the opposite press roll 8,9,11.
  • the length of the extended press nip is determined by the length of the concave press surface.
  • the fibrous web 1 runs together with both sides of a water-absorbing and air-permeable drainage tape 2.3 through the first press nip.
  • the upper dewatering belt 2 takes over the fibrous web 1 from a forming fabric 17 of an upstream former for sheet formation.
  • the fibrous web 1 is guided together by the two dewatering belts 2, 3 over a transfer line after the first press nip.
  • the sole leading lower dewatering belt 3 transfers the fibrous web 1 to the upper dewatering belt 4 of the second and last press nip of the press arrangement.
  • two dewatering belts 4, 5 run through the last press nip, they also guide the fibrous web 1 after the press nip together over a transfer path until the removal of the upper dewatering belt 4 from the fibrous web 1.
  • the upper dewatering belt 4 can be led away from the fibrous web 1 immediately after the last press nip, which reduces rewetting.
  • the contact with the transfer belt 6 leads not only to a smoothing of the contacted side of the fibrous web 1, but also to an increased adhesion of the same on the transfer belt 6, especially in the last press nip, which significantly improves the web guide, especially at high machine speeds.
  • the first extended press nip is formed by a lower shoe press roll 7 and an upper, drawn and cylindrical press roll 9.
  • the fibrous web 1 runs together with the upper dewatering belt 2 through a second press nip formed by the drawn press roll 9 and a press roll 13 with a smooth lateral surface.
  • a smoothing of the side of the fibrous web 1 coming into contact with the smooth press roller 13 occurs.
  • the fibrous web 1 adheres particularly well and can be guided along this.
  • the press arrangement consists only of these two press nips, so that the fibrous web 1 can subsequently be removed from the smooth press roller 13.
  • the pressing arrangement in FIG. 5 also comprises a third press nip, which is formed by the smooth press roll 13 and a cylindrical press roll 11 looped around by a water-absorbing dewatering belt 4.
  • a third press nip In the third press nip, further dewatering and smoothing of the fibrous web 1 takes place. After this last press nip, the fibrous web 1 can also be removed from the smooth press roller 13 here.
  • the dewatering belts 2, 3, 4 are in the form of endless circulating press felts, which are guided over guide rollers 15, 16 during their circulation.
  • the dewatering belts 2, 3, 4 can also be guided via evacuated guide rollers 15.
  • the transfer belts 6 have a permeability between 0 and 50 cfm. Their water storage capacity is between 0 and 1000, preferably between 0 and 500 ml / m 2 .
  • the diameter of the shoe press roll 7 of the first press nip is less than 2200 mm, preferably less than 1500 mm and in particular less than 1100 mm.
  • the press arrangement is particularly suitable for press arrangements for dewatering wood-free paper webs.

Landscapes

  • Paper (AREA)
EP08154357A 2007-07-28 2008-04-11 Agencement de presse Withdrawn EP2022891A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710035548 DE102007035548A1 (de) 2007-07-28 2007-07-28 Pressanordnung

Publications (2)

Publication Number Publication Date
EP2022891A2 true EP2022891A2 (fr) 2009-02-11
EP2022891A3 EP2022891A3 (fr) 2012-12-26

Family

ID=39876805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08154357A Withdrawn EP2022891A3 (fr) 2007-07-28 2008-04-11 Agencement de presse

Country Status (2)

Country Link
EP (1) EP2022891A3 (fr)
DE (1) DE102007035548A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3026173A1 (fr) * 2014-11-26 2016-06-01 BillerudKorsnäs AB Procédé de production d'un carton à partir de pulpe à papier comprenant NSSC pulpe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0487483A1 (fr) * 1990-11-23 1992-05-27 Valmet Paper Machinery Inc. Procédure et disposition pour drainage d'une bande de papier par pressage
DE19708966A1 (de) * 1997-03-05 1998-09-10 Voith Sulzer Papiermasch Gmbh Pressenanordnung
EP1026314A2 (fr) * 1999-02-04 2000-08-09 Voith Sulzer Papiertechnik Patent GmbH Dispositif de pressage
DE29624465U1 (de) * 1996-12-23 2004-03-04 Voith Paper Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0487483A1 (fr) * 1990-11-23 1992-05-27 Valmet Paper Machinery Inc. Procédure et disposition pour drainage d'une bande de papier par pressage
DE29624465U1 (de) * 1996-12-23 2004-03-04 Voith Paper Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
DE19708966A1 (de) * 1997-03-05 1998-09-10 Voith Sulzer Papiermasch Gmbh Pressenanordnung
EP1026314A2 (fr) * 1999-02-04 2000-08-09 Voith Sulzer Papiertechnik Patent GmbH Dispositif de pressage

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3026173A1 (fr) * 2014-11-26 2016-06-01 BillerudKorsnäs AB Procédé de production d'un carton à partir de pulpe à papier comprenant NSSC pulpe
WO2016083252A1 (fr) * 2014-11-26 2016-06-02 Billerudkorsnäs Ab Cannelure à haute résistance fabriquée à partir de pâte à papier au monosulfite
EP3026173B1 (fr) 2014-11-26 2017-04-05 BillerudKorsnäs AB Procédé de production d'un carton à partir de pulpe à papier comprenant NSSC pulpe et carton ondulé
CN107002363A (zh) * 2014-11-26 2017-08-01 比勒鲁迪克斯那斯公司 用nssc浆制成的高强度瓦楞芯纸
CN107002363B (zh) * 2014-11-26 2020-07-10 比勒鲁迪克斯那斯公司 用nssc浆制成的高强度瓦楞芯纸
RU2728404C2 (ru) * 2014-11-26 2020-07-29 Биллерудкорснес Аб Высокопрочный флютинг, изготовленный из нспц массы
US10850901B2 (en) 2014-11-26 2020-12-01 Billerudkorsnas Ab High-strength fluting from NSSC pulp
US20210047097A1 (en) * 2014-11-26 2021-02-18 Billerudkorsnas Ab High-strength fluting from nssc pulp
US11814227B2 (en) * 2014-11-26 2023-11-14 Billerudkorsnas Ab High-strength fluting from NSSC pulp

Also Published As

Publication number Publication date
DE102007035548A1 (de) 2009-01-29
EP2022891A3 (fr) 2012-12-26

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