EP1647628A1 - Section de presse - Google Patents

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Publication number
EP1647628A1
EP1647628A1 EP05106688A EP05106688A EP1647628A1 EP 1647628 A1 EP1647628 A1 EP 1647628A1 EP 05106688 A EP05106688 A EP 05106688A EP 05106688 A EP05106688 A EP 05106688A EP 1647628 A1 EP1647628 A1 EP 1647628A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
arrangement according
press arrangement
dewatering
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Withdrawn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
EP05106688A
Other languages
German (de)
English (en)
Inventor
Thomas Dr. Elenz
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
Voith Paper 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, Voith Paper Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1647628A1 publication Critical patent/EP1647628A1/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Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the invention relates to a pressing arrangement for dewatering a paper, cardboard, tissue or another fibrous web in a machine for producing and / or finishing the same with only one dewatering nip, which is extended and by the next to the fibrous web on both sides at least one endless circulating, water-absorbing drainage tape is performed.
  • Such drainage devices are very efficient because a relatively large drainage capacity is provided with a small space requirement and machine outlay.
  • the object of the invention is therefore to improve the surface properties of the fibrous web with the least possible effort.
  • the object has been achieved in that the fibrous web runs after the dewatering gap through a smoothing nip.
  • This smoothing gap reduces the roughness of the fibrous web at relatively low cost considerably.
  • the smoothing is supported by the relatively high moisture content of the fibrous web and the associated easier deformability.
  • a constructive simplification results when the dewatering gap is formed by a shoe press roll with a flexible roll shell, which is pressed by a pressing element with a concave pressing surface against a cylindrical counter roll.
  • the press nip in the web running direction should be at least 300 mm, preferably at least 350 mm long.
  • the dewatering belts Since the dewatering of the fibrous web takes place with only one dewatering gap, the dewatering belts must be able to absorb a great deal of water, which is why preferably heavy or medium-weight press felts are used.
  • the drainage tapes should be at least 25 m long.
  • the drainage is preferably carried out over several strong vacuum cleaner.
  • the dewatering belt running under the fibrous web should, after delivery of the fibrous web, wrap around at least one deflection guide roll lying in the loop of this dewatering belt, after which the fibrous web continues to run counter to the web running direction, at least with one component. In this sharp deflection usually already separate the fibrous web or the rest of the dewatering belt and fall down into the pulper.
  • the fibrous web should be unsupported after the removal of the dewatering belts a short free distance to the calendering nip. This also makes it possible in the area of this free route If necessary, to arrange the pulp web separating punching device. This chopper separates the fibrous web in an emergency and prevents so that the following machine units further web material is supplied, which may possibly lead to damage of the same.
  • the separated fibrous web runs into the underlying pulper.
  • the calendering nip should be formed by two smooth-surface smoothing rolls, and preferably the lower smoothing roll of the calendering nip should be vertically movable. When transferring so the smoothing gap can be opened easily.
  • the fibrous web should be passed through at least one subsequent drying group in which the fibrous web for drying preferably comes into contact with heated drying cylinders and is supported by at least one drying wire.
  • the fibrous web can be dried on both sides, which can be achieved, for example, by a meander-shaped web guide over two rows of drying cylinders, wherein each row is assigned a drying wire.
  • the fibrous web can be dried in the drying group only on one side.
  • the fibrous web runs, supported by the dryer fabric, meandering alternately over heated drying cylinders and guide rolls.
  • a common pulper should be present under the press assembly and the beginning of the first dryer group.
  • this press arrangement is particularly suitable for applications in which the fibrous web is subsequently coated. This means that the fibrous web is passed through a surface coating device after drying.
  • the fibrous web 1 is transferred in both cases by a forming wire 2 of a former for sheet formation to a above the fibrous web 1 endlessly circulating, water-absorbing dewatering belt 3. This takeover is supported by a looped by Entskyssansband 3, suctioned guide roller.
  • the upper dewatering belt 3 leads the fibrous web 1 to the single dewatering nip of the press arrangement, through which the fibrous web 1 runs together with the upper and a lower, likewise water-absorbing, endlessly circulating dewatering belt 4.
  • This dewatering gap is made extended and is formed by a shoe press roll 6 and a cylindrical counter roll 7.
  • the shoe press roll 6 has a flexible roll shell, which is pressed by a contact pressure element 8 with concave pressing surface to the counter roll 7 out.
  • the press nip is about 350 mm long, which ensures a sufficiently long residence time of the fibrous web 1 in the press nip and allows gentle, yet intense dewatering at a relatively low pressure.
  • the upper dewatering belt 3 is led away from the fibrous web 1, so that it is guided only by the lower dewatering belt 4.
  • the lower dewatering belt 4 runs in this area along a separating suction device 9, whose negative pressure increases the adhesion of the fibrous web 1 to the lower dewatering belt 4. It may also be advantageous to design the dewatering belts 3, 4 in such a way that the adhesion of the fibrous web 1 to the lower dewatering belt 4 is greater than to the upper 3.
  • the fibrous web 1 is also detached from the lower dewatering belt 4. From there it passes over a short free distance without guidance through a band or a roller to the smoothness gap.
  • the lower dewatering belt 4 is guided over a deflection guide roller 13 located in the loop of the dewatering belt 4, which wraps around it so strongly that the dewatering belt 4 subsequently runs counter to the web running direction 18, at least with one component. This relatively strong deflection ensures that the fibrous web 1 or parts thereof, which still adhere to the dewatering belt 4, detach and fall into the pulper 17 underneath.
  • the lower dewatering belt 4 wraps around another outer guide roller 14 located outside the loop. Any existing adhesions on the dewatering belt 4 are released to the smooth outer surface of the outer guide roller 14 and from there passed with a scraper 15 in the pulper 17.
  • the drainage bands 3,4 are designed as heavy press felts because of the necessary large water absorption capacity. To be able to dewater these after the press nip sufficiently, they are 25 m long. The drainage takes place via several, strong pipe sucker.
  • the smoothing gap is formed by two smoothing rollers 11,12 with smooth outer surface.
  • the lower smoothing roll 12 is vertically movable. For transferring so the smoothing gap can be opened. Both scrapers 11,12 a scraper 21 is assigned.
  • a chopping device 10 which can separate the fibrous web 1.
  • the activation of the knock-off device 10 takes place, for example, during a tear or tearing, so that the web feed is interrupted in the following units. This protects the units from damage.
  • the separated fibrous web 1 runs into the pulper 17th
  • the fibrous web 1 passes into one of several following drying groups for drying.
  • the fibrous web 1 after the separation from the upper smoothing roll 11, the fibrous web 1 still runs unsupported for a short distance before being taken up by a drying wire 5 of the drying group.
  • the lateral surface of the lower smoothing roll 12 is slightly harder than that of the upper eleventh
  • the fibrous web 1 is dried on both sides. For this purpose, it wraps around the heated drying cylinders 16 of two superimposed rows of drying cylinders in meandering fashion.
  • Each row of drying cylinders is one Dryer 5 assigned, which presses the fibrous web 1 against the lateral surface of the drying cylinder 16 of the corresponding row of drying cylinders.
  • a smooth transfer belt 19 of the lower smoothing roller 12 passes through the calendering nip.
  • This transfer belt 19 can guide the fibrous web 1 after the calendering nip to the receiving dryer 5.
  • the acquisition can be supported by an air-permeable dryer fabric 5 looped and evacuated guide roller.
  • the fibrous web 1 is dried only on one side. For this purpose, it runs supported by the drying wire 5, meandering alternately over heated drying cylinders 16 and suctioned guide rollers 20th
  • the pulper 17 extends in both cases over the press assembly and the beginning of the dryer group.
  • the fibrous web 1 After the dryer groups, the fibrous web 1 enters a coating apparatus in which the fibrous web 1 can be coated on one or two sides. Because of the smoothness of the fibrous web 1 achieved in the press arrangement with the calendering nip, the coating with very good quality is possible.

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  • Paper (AREA)
EP05106688A 2004-10-16 2005-07-21 Section de presse Withdrawn EP1647628A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004050593A DE102004050593A1 (de) 2004-10-16 2004-10-16 Pressanordnung

Publications (1)

Publication Number Publication Date
EP1647628A1 true EP1647628A1 (fr) 2006-04-19

Family

ID=34940310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05106688A Withdrawn EP1647628A1 (fr) 2004-10-16 2005-07-21 Section de presse

Country Status (3)

Country Link
US (1) US20060102310A1 (fr)
EP (1) EP1647628A1 (fr)
DE (1) DE102004050593A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1978154A1 (fr) * 2007-04-07 2008-10-08 Voith Patent GmbH Machine pour fabriquer une bande de matériau fibreux
EP2305882A2 (fr) 2009-09-30 2011-04-06 Voith Patent GmbH Procédé et machine destinés à la fabrication d'une bande de matière fibreuse
DE102009045185A1 (de) 2009-09-30 2011-04-07 Voith Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
WO2011151201A1 (fr) * 2010-06-01 2011-12-08 Voith Patent Gmbh Partie humide d'une machine destinée à fabriquer des bandes de matière fibreuse et utilisation d'une telle partie humide
WO2012007212A1 (fr) 2010-07-16 2012-01-19 Voith Patent Gmbh Procédé et machine pour fabriquer une bande de matière fibreuse
DE102010031447A1 (de) 2010-07-16 2012-01-19 Voith Patent Gmbh Verfahren und Maschine zur Herstellung einer Faserstoffbahn

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5147508A (en) * 1991-10-11 1992-09-15 The Nash Engineering Company Suction box covers for cleaning papermaking machine felts
US5762761A (en) * 1995-04-24 1998-06-09 Valmet Corporation Press section of a paper machine employing two separate press nips
US5849156A (en) * 1995-02-02 1998-12-15 Valmet Corporation Press section with an equalizing nip in a paper machine
US6638395B1 (en) * 1999-07-24 2003-10-28 Voith Sulzer Papiertechnik Patent Gmbh Paper machine and process
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
DE10247537A1 (de) * 2002-10-11 2004-04-22 Voith Paper Patent Gmbh Pressenanordnung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003212238A1 (en) * 2002-02-22 2003-09-09 Voith Paper Patent Gmbh Smoothing device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5147508A (en) * 1991-10-11 1992-09-15 The Nash Engineering Company Suction box covers for cleaning papermaking machine felts
US5849156A (en) * 1995-02-02 1998-12-15 Valmet Corporation Press section with an equalizing nip in a paper machine
US5762761A (en) * 1995-04-24 1998-06-09 Valmet Corporation Press section of a paper machine employing two separate press nips
US6638395B1 (en) * 1999-07-24 2003-10-28 Voith Sulzer Papiertechnik Patent Gmbh Paper machine and process
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
DE10247537A1 (de) * 2002-10-11 2004-04-22 Voith Paper Patent Gmbh Pressenanordnung

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1978154A1 (fr) * 2007-04-07 2008-10-08 Voith Patent GmbH Machine pour fabriquer une bande de matériau fibreux
EP2305882A2 (fr) 2009-09-30 2011-04-06 Voith Patent GmbH Procédé et machine destinés à la fabrication d'une bande de matière fibreuse
DE102009045185A1 (de) 2009-09-30 2011-04-07 Voith Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
DE102009045177A1 (de) 2009-09-30 2011-04-07 Voith Patent Gmbh Verfahren und Maschine zur Herstellung einer Faserstoffbahn
EP2305882A3 (fr) * 2009-09-30 2011-05-18 Voith Patent GmbH Procédé et machine destinés à la fabrication d'une bande de matière fibreuse
WO2011151201A1 (fr) * 2010-06-01 2011-12-08 Voith Patent Gmbh Partie humide d'une machine destinée à fabriquer des bandes de matière fibreuse et utilisation d'une telle partie humide
WO2012007212A1 (fr) 2010-07-16 2012-01-19 Voith Patent Gmbh Procédé et machine pour fabriquer une bande de matière fibreuse
DE102010031447A1 (de) 2010-07-16 2012-01-19 Voith Patent Gmbh Verfahren und Maschine zur Herstellung einer Faserstoffbahn
DE102010031450A1 (de) 2010-07-16 2012-01-19 Voith Patent Gmbh Verfahren und Maschine zur Herstellung einer Faserstoffbahn

Also Published As

Publication number Publication date
DE102004050593A1 (de) 2006-04-20
US20060102310A1 (en) 2006-05-18

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