EP1775377A1 - Agencement de presse - Google Patents

Agencement de presse Download PDF

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Publication number
EP1775377A1
EP1775377A1 EP06121938A EP06121938A EP1775377A1 EP 1775377 A1 EP1775377 A1 EP 1775377A1 EP 06121938 A EP06121938 A EP 06121938A EP 06121938 A EP06121938 A EP 06121938A EP 1775377 A1 EP1775377 A1 EP 1775377A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
dewatering
press
press nip
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Withdrawn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
EP06121938A
Other languages
German (de)
English (en)
Inventor
Peter Mirsberger
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 EP1775377A1 publication Critical patent/EP1775377A1/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Withdrawn legal-status Critical Current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
    • D21F3/04—Arrangements thereof

Definitions

  • the invention relates to a press arrangement for dewatering a paper, board or other fibrous web in a machine for producing and / or finishing the same with an extended dewatering press nip.
  • the dewatering of the fibrous web over substantially only one press nip allows the construction of very compact press arrangements with a reduced capital outlay.
  • the fibrous web often does not have sufficient strength, in particular flexural rigidity.
  • the object of the invention is therefore to increase the strength of the fibrous web with the least possible effort.
  • this object is achieved in that the fibrous web runs after the dewatering press nip through a compaction press nip for densification.
  • This measure is based on the knowledge that in the extended dewatering press nip only an insufficient compression of the fibrous web takes place.
  • the high hydraulic pressure in the dewatering press nip and the high dewatering rates prevent the fibers of the fibrous web from forming a sufficient number of contact points with one another. As a result, not enough hydrogen bonds can form during drying of the fibrous web, so that the fibrous web has only insufficient strength (tear length, gap strength, bending stiffness, etc.).
  • the fibrous web is compacted in the claimed invention still in the wet state and solidified. For this purpose, it passes through the compaction press nip at the end of the press section or at the beginning of a subsequent dryer section.
  • the compaction press nip does not focus on dewatering but only on compaction, it is sufficient if the compaction pressure in the compacting press nip is smaller than in the dewatering press nip.
  • the compacting pressure in the compacting press nip is less than 1 MPa, preferably less than 0.5 MPa.
  • the compaction press nip forming pressing surfaces have a smooth surface.
  • the smoothing in the compression nip also has the advantage that the paper runs less rough in the size or film press and therefore can be a more uniform layer of surface sizing agents transferred to the surfaces.
  • the more homogeneous and closed film of strength enhancing sizing agents increases the modulus of elasticity of the web on the surfaces, thereby improving the flexural rigidity.
  • the fibrous web runs together with a smooth transfer belt through compacting press nip.
  • the transfer belt can take over the leadership of the fibrous web before and after the compaction press nip and thereby make them more stable.
  • the smooth surface of the transfer belt thereby improves the smoothness of the contact side of the fibrous web.
  • the fibrous web should be performed together with an at least water-absorbing dewatering belt through the compression press nip.
  • the fibrous web runs with only one or both sides depending on a dewatering belt or with a dewatering belt and an opposite transfer belt through the compression-press nip.
  • the fibrous web is guided together with an air-permeable drying belt of the following drying section through the compacting press nip.
  • the fibrous web should pass through the dewatering press nip together with a water-absorbing dewatering band on both sides.
  • At least the essential part of the dewatering takes place in only one extended dewatering press nip of the press section.
  • This dewatering press nip is formed by a shoe press roll 5 and a counter roll 6.
  • the shoe press roll 5 has a flexible roll shell, which is pressed by a pressing element with a concave pressing surface to the counter roll 6.
  • the longer residence time of the fibrous web 1 in the extended dewatering press nip allows intensive and yet gentle dewatering of the fibrous web 1.
  • the fibrous web 1 runs together with a water-absorbing drainage belt 2, 3 in each case on both sides in the form of a press felt through the dewatering press nip.
  • the lower dewatering belt 1 in FIGS. 1-5 carries the fibrous web 1 after the removal of the upper dewatering belt 3 alone.
  • the fibrous web 1 enters the dryer section. There, the fibrous web 1 is supported for drying by an air-permeable drying belt 4, alternately heated by drying cylinders 9 and suctioned guide rollers 10th guided.
  • the drying belt 4 presses the fibrous web 1 against the hot jacket surface of the drying cylinder 9.
  • the dryer section consists of several dryer groups, which have their own drying belt 4.
  • the fibrous web 1 is passed after this through a compacting press nip.
  • the compaction pressure in the compaction press nip is below 0.5 MPa, which is significantly lower than in the dewatering press nip.
  • both dewatering belts 2, 3 of the dewatering press nip after passing through them, are guided together with the intermediate fibrous web 1 through a compacting press nip.
  • This compacting press nip is formed here by an upper press roll 7 and a lower, sucked press roll 8 and, because of the water-absorbing drainage belts 2, 3, also causes additional drainage.
  • the upper dewatering belt 3 is guided away from the fibrous web 1, so that the lower dewatering belt 2 can transfer the fibrous web 1 to the drying belt 4 of the following drying group. This transfer is supported by a wound by the drying belt 4, evacuated guide roll.
  • the drying belt 4 is formed as a drying wire.
  • the fibrous web 1 is transferred from the lower dewatering belt 2 to an upper dewatering belt 13 of the following compacting press nip.
  • This compacting press nip also guides a smooth transfer belt 12 running under the fibrous web 1.
  • the smooth surface of the transfer belt 12 also causes a smoothing of the contact side of the fibrous web.
  • the fibrous web 1 will adhere more strongly to the transfer belt 12, so that the dewatering belt 13 can easily be led away from the fibrous web 1 after the compacting press nip.
  • the transfer belt 12 then transfers the fibrous web 1 to the drying belt 4 of the following drying group.
  • FIGS. 3 to 6 each show a press arrangement with only one dewatering press nip, wherein the fibrous web 1 is subsequently transferred to the drying belt 4 of the following drying group.
  • the compaction takes place at the beginning of the dryer section, since the fibrous web 1 is still sufficiently moist there.
  • FIG. 3 shows an embodiment in which the drying belt 4 is guided through the compacting press nip after takeover of the fibrous web 1.
  • the compacting press nip is formed by an upper 7 and a lower press roller 8.
  • the drying belt 4 is designed here as a dry felt with a fine surface and does not allow drainage.
  • the embodiment according to FIG. 4 differs from that according to FIG. 3 in that the compacting press nip is formed between the upper press roll 7 and a drying cylinder 9 or a press roll.
  • the fibrous web 1 runs through the compaction press nip together with a dewatering belt 13 or a drying belt 4.
  • the fibrous web 1 continues to run on the smooth drying cylinder 9 until it is taken over by a drying belt 4 of a following drying group.
  • Both versions are relatively simple in construction and are particularly suitable for conversions of existing plants.
  • the fibrous web 1 is first guided around a heated drying cylinder 9 and then transferred to a second drying cylinder 9.
  • a press belt 11 partially wraps around this second drying cylinder 9 and thus presses the fibrous web 1 against the cylindrical surface. Subsequently, the fibrous web 1 is taken over by a drying belt 4 of a following drying group. Because of the smooth surfaces, this results in a smoothing of the fibrous web 1 on both sides.
  • the aspiration allows the removal of the lower dewatering belt 4 from the fibrous web 1.
  • the press roll 8 forms the compacting press nip with the smooth press roll 7. After this, the fibrous web 1 runs because of the stronger adhesion to the smooth Mantle surface of the press roll 7 until the transfer to the drying belt 4 of the following drying group on.

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  • Paper (AREA)
EP06121938A 2005-10-13 2006-10-09 Agencement de presse Withdrawn EP1775377A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510048927 DE102005048927A1 (de) 2005-10-13 2005-10-13 Pressanordnung

Publications (1)

Publication Number Publication Date
EP1775377A1 true EP1775377A1 (fr) 2007-04-18

Family

ID=37493072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06121938A Withdrawn EP1775377A1 (fr) 2005-10-13 2006-10-09 Agencement de presse

Country Status (2)

Country Link
EP (1) EP1775377A1 (fr)
DE (1) DE102005048927A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019132446A1 (de) * 2019-11-29 2021-06-02 Voith Patent Gmbh Beschichtung von Faserstoffbahnen

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9113500U1 (de) * 1991-10-30 1991-12-19 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Vorrichtung zur mechanisch-thermischen Entwässerung einer Faserstoffbahn
WO1998000605A1 (fr) * 1996-06-28 1998-01-08 The Procter & Gamble Company Procede de fabrication de papier de soie presse a l'etat humide avec des feutres presentant des permeabilites selectionnees
DE29800330U1 (de) * 1997-01-28 1998-04-23 Voith Sulzer Papiertechnik Patent GmbH, 89522 Heidenheim Pressenpartie
DE19708966A1 (de) * 1997-03-05 1998-09-10 Voith Sulzer Papiermasch Gmbh Pressenanordnung
DE10051649A1 (de) * 2000-10-18 2002-05-02 Voith Paper Patent Gmbh Pressenanordnung
WO2003002814A1 (fr) * 2001-06-28 2003-01-09 Voith Paper Patent Gmbh Train de sechage
EP1375739A2 (fr) * 2002-06-25 2004-01-02 Voith Paper Patent GmbH Machine pour la fabrication d'une bande fibreuse
WO2004022845A1 (fr) * 2002-09-09 2004-03-18 Metso Paper, Inc Procede de fabrication de carton, machine de fabrication de carton et section de presse pour epaississement d'une bande fibreuse humide
EP1418270A1 (fr) * 2002-11-06 2004-05-12 Voith Paper Patent GmbH Dispositif de pressage

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9113500U1 (de) * 1991-10-30 1991-12-19 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Vorrichtung zur mechanisch-thermischen Entwässerung einer Faserstoffbahn
WO1998000605A1 (fr) * 1996-06-28 1998-01-08 The Procter & Gamble Company Procede de fabrication de papier de soie presse a l'etat humide avec des feutres presentant des permeabilites selectionnees
DE29800330U1 (de) * 1997-01-28 1998-04-23 Voith Sulzer Papiertechnik Patent GmbH, 89522 Heidenheim Pressenpartie
DE19708966A1 (de) * 1997-03-05 1998-09-10 Voith Sulzer Papiermasch Gmbh Pressenanordnung
DE10051649A1 (de) * 2000-10-18 2002-05-02 Voith Paper Patent Gmbh Pressenanordnung
WO2003002814A1 (fr) * 2001-06-28 2003-01-09 Voith Paper Patent Gmbh Train de sechage
EP1375739A2 (fr) * 2002-06-25 2004-01-02 Voith Paper Patent GmbH Machine pour la fabrication d'une bande fibreuse
WO2004022845A1 (fr) * 2002-09-09 2004-03-18 Metso Paper, Inc Procede de fabrication de carton, machine de fabrication de carton et section de presse pour epaississement d'une bande fibreuse humide
EP1418270A1 (fr) * 2002-11-06 2004-05-12 Voith Paper Patent GmbH Dispositif de pressage

Also Published As

Publication number Publication date
DE102005048927A1 (de) 2007-04-19

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