EP1770204A2 - Dispositif de pressage - Google Patents

Dispositif de pressage Download PDF

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Publication number
EP1770204A2
EP1770204A2 EP06120661A EP06120661A EP1770204A2 EP 1770204 A2 EP1770204 A2 EP 1770204A2 EP 06120661 A EP06120661 A EP 06120661A EP 06120661 A EP06120661 A EP 06120661A EP 1770204 A2 EP1770204 A2 EP 1770204A2
Authority
EP
European Patent Office
Prior art keywords
press
central
roll
arrangement according
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.)
Withdrawn
Application number
EP06120661A
Other languages
German (de)
English (en)
Other versions
EP1770204A3 (fr
Inventor
Daniel Gronych
Robert Koplin
Georg Dr. Kleiser
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 EP1770204A2 publication Critical patent/EP1770204A2/fr
Publication of EP1770204A3 publication Critical patent/EP1770204A3/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Withdrawn legal-status Critical Current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
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor

Definitions

  • the invention relates to a press arrangement for dewatering a paper, cardboard, tissue or another fibrous web in a machine for producing and / or finishing the same with a central roll, which forms two press nips with two counterpressure units, wherein the counterpressure units of a water-absorbing dewatering belt and the central roller are wrapped by a central band.
  • the invention also relates to a method for converting a press arrangement for dewatering a paper, board, tissue or another fibrous web of a machine for producing and / or finishing the same with a central roll, which forms two press nips with two counterpressure units, wherein the counterpressure units of a water-absorbing dewatering band are looped around and at least the second counterpressure unit in the web running direction is formed by a cylindrical press roll.
  • the central belt usually takes over the safe guidance of the fibrous web to a following machine unit.
  • the line forces in the press nips of the central roll are usually limited to a relatively low level, which reduces the drainage performance.
  • the object of the invention is therefore to provide a compact pressing arrangement with the highest possible dewatering performance and reduced two-sidedness with respect to the roughness.
  • the object has been achieved in that the central band has a roughness (Ra) of at least 2 ⁇ m on the side coming into contact with the fibrous web.
  • the relatively high roughness of the central belt reduces the two-sidedness of the fibrous web considerably, without impairing the guidance of the fibrous web.
  • the central belt has a roughness (Ra) of at least 3 ⁇ m.
  • the central band should be impermeable or slightly permeable, with the cfm preferably being less than 10.
  • the associated, at most low water absorption capacity of the central belt thus also counteracts the rewetting of the fibrous web, in particular during the guide to the last press nip.
  • the hardness of the central band should be at least on the side in contact with the fibrous web at most 30 P & J in the uncompressed belt state under standard conditions.
  • the first press nip of the central roll in the web running direction is usually a transfer press nip, it is sufficient if the line force in the latter is at most 120 kN / m, preferably at most 100 kN / m.
  • the line load in the second press nip of the central roll is greater than 150 kN / m and less than 1500 kN / m, preferably less than 1000 kN / m.
  • the press arrangement if the counter press unit involved in the first press nip of the central press is designed as a suction press roll.
  • the negative pressure of the suction press roll supports the removal of pressed in the press nip from the fibrous web water and at the same time the leadership of the fibrous web at the dewatering belt to the transfer of the fibrous web to the central belt.
  • the counterpressure unit involved in the first press nip of the central roll forms a preceding press nip with another press unit, preferably in the form of a press roll.
  • the central belt should preferably transfer the fibrous web to a belt of a subsequent machine unit. In this way, it is possible to ensure continuous support of the fibrous web in the press arrangement on at least one band, which reduces the risk of demolition, especially at high machine speeds.
  • the central roller should have a smooth lateral surface, which reduces the stress on the central belt, in particular in the press nips.
  • both press units have their own drainage tape. This ensures a high water absorption capacity of the dewatering belts in the press nips and reduces the rewetting of the fibrous web.
  • the use of the central belt is particularly suitable for conversions of press arrangements in which the central roller is not looped by any band.
  • the central band should have a connecting seam. This allows one end to be inserted into the press assembly and then connected to the other end of the center band.
  • the second press unit is replaced by a shoe press roll and a central belt is guided around the central roll, which has a roughness Ra of at least 2 ⁇ m.
  • the roughness of the fibrous web is determined essentially by the contact to the one hand smooth central roll (Ra about 0.4 - 2 microns) and the dewatering belt (fiber structure with about 3 - 44 dtex usual).
  • the fibrous web 1 is transferred here from a forming wire 10 of an upstream former to a water-absorbing, upper dewatering belt 8 of the pressing arrangement.
  • This dewatering belt 8 then carries the fibrous web 1 together with a water-absorbing dewatering belt 12 extending below the fibrous web 1 through a first press nip of the press arrangement.
  • This press nip is formed by a lower press roll 6 and an upper suction press roll 5.
  • the press suction roll 5 has a perforated roll shell whose interior is at least partially connected to a vacuum source.
  • the negative pressure here not only supports the removal of the pressed out of the fibrous web 1 water, but also the adhesion of the fibrous web 1 at the top Dewatering belt 8, so that the lower dewatering belt 12 can be easily led away from the fibrous web 1 after the first press nip.
  • the fibrous web 1 runs together with the upper dewatering belt 8 through a second press nip of the press assembly, which is formed by the suction press roll 8 and a central roll 3.
  • a line force of up to 120 kN / m is sufficient, even to protect the suction press roll 8.
  • the central roller 3 has a smooth lateral surface and is looped around by an endlessly circulating central belt 2.
  • This central belt 2 leads the fibrous web 1 after this second press nip to a third, formed between the central roll 3 and a shoe press roll 4 press nip.
  • the shoe press roll 4 has a flexible roll shell, which is pressed by a press shoe with concave pressing surface to form an extended press nip to the central roll 3.
  • the extended press nip allows for intensive yet gentle dewatering.
  • the line force in this third press nip should be between 150 and 1000 kN / m.
  • the water-absorbing drainage bands 8,9,12 are formed as press felts and therefore relatively rough.
  • the central band 2 has a roughness (Ra) of more than 2 ⁇ m.
  • the central band 2 with a cfm value of less than 10 is only slightly permeable. Associated with this is at most a slight water absorption capacity, so that no substantial rewetting of the fibrous web 1 from the central belt 2 is to be feared.
  • the central belt 2 is so smooth that it comes to a sufficient adhesion of the fibrous web 1 on the central belt 2 and the dewatering belt 9 can be led away without any problems from the fibrous web 1 after the third press nip.
  • the central belt 2 leads the fibrous web 1 to a belt 11 of a following machine unit, here a dryer section, in which the fibrous web 1 is supported by the belt 11, passed over heated drying cylinders 7.
  • the hardness of the central belt 2 is less than 30 P & J, so that no too large imprints in the fibrous web 1 are to be feared and on the other hand a sufficient resistance, especially given the increased line forces in the extended press nip of the central roll 3.

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  • Paper (AREA)
EP06120661A 2005-10-01 2006-09-14 Dispositif de pressage Withdrawn EP1770204A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510047269 DE102005047269A1 (de) 2005-10-01 2005-10-01 Pressanordnung

Publications (2)

Publication Number Publication Date
EP1770204A2 true EP1770204A2 (fr) 2007-04-04
EP1770204A3 EP1770204A3 (fr) 2008-01-23

Family

ID=37622009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06120661A Withdrawn EP1770204A3 (fr) 2005-10-01 2006-09-14 Dispositif de pressage

Country Status (2)

Country Link
EP (1) EP1770204A3 (fr)
DE (1) DE102005047269A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0576115A1 (fr) * 1992-06-11 1993-12-29 Albany International Corp. Bande de transfert
EP0908556A2 (fr) * 1997-10-07 1999-04-14 Voith Sulzer Papiertechnik Patent GmbH Machine à papier et procédé de fabrication d'une bande de papier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0576115A1 (fr) * 1992-06-11 1993-12-29 Albany International Corp. Bande de transfert
EP0908556A2 (fr) * 1997-10-07 1999-04-14 Voith Sulzer Papiertechnik Patent GmbH Machine à papier et procédé de fabrication d'une bande de papier

Also Published As

Publication number Publication date
EP1770204A3 (fr) 2008-01-23
DE102005047269A1 (de) 2007-04-05

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