WO2003002814A1 - Train de sechage - Google Patents

Train de sechage Download PDF

Info

Publication number
WO2003002814A1
WO2003002814A1 PCT/EP2002/007070 EP0207070W WO03002814A1 WO 2003002814 A1 WO2003002814 A1 WO 2003002814A1 EP 0207070 W EP0207070 W EP 0207070W WO 03002814 A1 WO03002814 A1 WO 03002814A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibrous web
drying
smoothing
press
section
Prior art date
Application number
PCT/EP2002/007070
Other languages
German (de)
English (en)
Inventor
Thomas Augscheller
Original Assignee
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 Paper Patent Gmbh filed Critical Voith Paper Patent Gmbh
Publication of WO2003002814A1 publication Critical patent/WO2003002814A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • the invention relates to a dryer section of a machine for producing and / or finishing a paper, cardboard, tissue or other fibrous web in which the fibrous web, supported by drying fabrics, is guided over at least a number of heated drying cylinders, the fibrous web being guided by one upstream press section for dewatering the fibrous web to the dryer section.
  • the fibrous web runs with one or both sides of a press felt through at least one press nip.
  • the result is a relatively high roughness on the side of the fibrous web that comes into contact with the press felt. This applies, albeit to a lesser extent, to the side of the fibrous web that is in contact with a transfer belt or a dryer fabric.
  • the fibrous web therefore often has too high a roughness and, if there is only one press felt in the last press nip, also a pronounced two-sidedness, that is to say different surface properties.
  • the fibrous web increasingly does not meet the requirements for smoothness and printability.
  • the object of the invention is therefore to reduce the two-sidedness and the roughness of the fibrous web with relatively simple means.
  • the object was achieved in that at least on one of the first 6 drying cylinders of the dryer section a smoothing gap is formed between the drying cylinder and a smoothing device, in particular a smoothing roller, through which only the fibrous web runs, the pressing forces in the smoothing gap between 5 and 80 KN / m lie.
  • Shoe press rollers or press belts for formation can also be used as smoothing devices extended smoothing gap are used. While the flexible roll jacket in shoe press rolls is pressed against the drying cylinder by a pressing unit with a concave pressing surface, this is done with the press belts via the belt tension.
  • the smoothing gap at the beginning of the dryer section reduces the two-sidedness and the roughness of the fibrous web in a very efficient manner due to the smooth surfaces of the drying cylinder and smoothing device, since the fibrous web is very moist and soft in this area.
  • press forces must be limited to avoid excessive surface compaction. In most cases, press forces between 10 and 30 KN / m are sufficient in the smoothing gap.
  • a smoothing gap at the beginning of the drying section is sufficient, which should be present on one of the first 2, preferably on the first drying cylinder because of the higher moisture content of the fibrous web.
  • a first dryer fabric should guide the fibrous web from the press section to the first dryer cylinder and be guided away from the dryer cylinder in front of the smoothing gap. This allows the formation of a first drying group with only 2, preferably only one drying cylinder, which is positive for the rapid train build-up because of the stretching of the fibrous web.
  • the expansion can namely be compensated for by a higher speed of the dryer fabric of the second dryer group following the smoothing gap.
  • the fibrous web In particular at high machine speeds, it is advantageous to avoid tearing or even tearing of the fibrous web if it runs continuously from the beginning of the press section to the smoothing nip supported by at least one belt in the form of a press felt, a transfer belt, a dryer fabric or the like.
  • the supported area can also be extended beyond the smoothing gap.
  • the smoothing gap reduces the roughness of the fibrous web on both sides. This applies in particular to high-speed press sections with one or two press nips and preferably one press felt in each press nip on each side of the fibrous web.
  • the smoothing nip can be used not only to reduce the roughness but also to reduce the roughness bilaterality.
  • the smoothing roller should have an elastic cover.
  • the smoothing roller can be deflection-controlled. This allows the thickness profile of the fibrous web to be influenced transversely to the direction of web travel, which can be desired, for example, in the case of coating base papers.
  • the fibrous web 1 passes through two press nips together with a press felt 5 on each side, of which only the last press nip is shown here.
  • the press nips are elongated and are each formed by a cylindrical press roll 11 and a shoe press roll 10 of a known type.
  • Such a press section has a high drainage capacity and is suitable for very high machine speeds due to the continuous support of the fibrous web 1 by at least one press felt 5.
  • the water-absorbing, endlessly circulating press felts 5 lead to an undesirably high roughness of the fibrous web 1 in the press nips.
  • the upper press felt 5 is removed from the fibrous web 1 led away and the fibrous web 1 then from the lower press felt 5 on
  • This dryer fabric 2 leads the fibrous web 1 to the first heated drying cylinder 3 of the dryer section. After the fibrous web 1 adheres to the first drying cylinder 3 to a sufficient extent, the dryer fabric 2 is guided away from the fibrous web 1. Subsequently, the fibrous web 1 passes through a smoothing gap formed by the first drying cylinder 3 and a driven smoothing roller 4. This smoothing gap increases the smoothness and reduces the two-sidedness of the fibrous web 1 due to the good formability of the still relatively moist fibrous web 1 at the beginning of the drying process in a simple and efficient manner. Pressing forces between 10 and 30 KN / m in the smoothing gap are sufficient for this.
  • the smoothing roller 4 has an elastic cover 6, which facilitates the adaptation to the surface of the drying cylinder 3 and protects the fibrous web 1 from overpressing.
  • the smoothing roller 4 can also be designed to be deflection-controlled. This enables the thickness profile of the fibrous web 1 to be influenced in zones transverse to the web running direction 12.
  • the fibrous web 1 is transferred from the first drying cylinder 3 to a subsequent dryer fabric 2 of a subsequent dryer group.
  • the fibrous web 1 is alternately guided over heated drying cylinders 3 and suction-guided guide rollers 8, with the drying cylinders 3 and the guide rollers 8 being arranged in a row.
  • the fibrous web 1 is supported by the corresponding dryer fabric 2, the dry fabric 2 also pressing the fibrous web 1 against the surface of the heated drying cylinders 3.
  • the guide rollers 8 are each assigned a suction box 9, which not only sucks the guide roller 8 in a known manner, but also guides the fibrous web 1 on the dryer fabric 2 in the region between the drying cylinder 3 and guide roller 8 supported.
  • the first dryer group of the dryer section is formed by only one dryer cylinder 3, which is advantageous for the expansion compensation of the fibrous web 1.

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  • Paper (AREA)

Abstract

L'invention concerne le train de séchage d'une machine de fabrication et/ou de façonnage d'une bande (1) de papier, de carton, de tissu ou d'une autre matière fibreuse. Dans ce train de séchage, la bande de matière fibreuse (1) est acheminée, soutenue par des tamis de séchage (2), sur au moins un rang de rouleaux de séchage (3) chauffés, ladite bande de matière fibreuse (1) étant amenée au train de séchage après avoir passé par une section de presses situées en amont pour le drainage. L'invention vise à diminuer la rugosité de la bande de matière fibreuse (1) séchée. A cet effet, sur au moins un des six premiers rouleaux (3) du train de séchage, un interstice de lissage est formé entre le rouleau de séchage (3) et un cylindre de lissage (4), interstice dans lequel seule la bande de matière fibreuse (1) passe, les forces de compression dans l'interstice variant entre 5 et 80 KN/m.
PCT/EP2002/007070 2001-06-28 2002-06-26 Train de sechage WO2003002814A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001131346 DE10131346A1 (de) 2001-06-28 2001-06-28 Trockenpartie
DE10131346.2 2001-06-28

Publications (1)

Publication Number Publication Date
WO2003002814A1 true WO2003002814A1 (fr) 2003-01-09

Family

ID=7689874

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/007070 WO2003002814A1 (fr) 2001-06-28 2002-06-26 Train de sechage

Country Status (2)

Country Link
DE (1) DE10131346A1 (fr)
WO (1) WO2003002814A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1775377A1 (fr) * 2005-10-13 2007-04-18 Voith Patent GmbH Agencement de presse

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10306247A1 (de) * 2003-02-14 2004-08-26 Voith Paper Patent Gmbh Pressanordnung
DE102005009858A1 (de) * 2005-03-04 2006-09-07 Voith Paper Patent Gmbh Papiermaschine
DE102009002984A1 (de) 2009-05-11 2010-11-18 Voith Patent Gmbh Verfahren zur Behandlung von Materialbahnen, insbesondere Faserstoffbahnen in Vorrichtungen zum Trocknen derartiger Materialbahnen und Vorrichtung zum Trocknen von Materialbahnen
DE102009027674A1 (de) 2009-07-14 2011-01-20 Voith Patent Gmbh Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn, insbesondere Papier- oder Kartonbahn

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5127168A (en) * 1989-07-20 1992-07-07 Pulp And Paper Research Institute Of Canada Method for manufacture of smooth and glossy papers and apparatus
DE19602697A1 (de) * 1995-12-22 1997-06-26 Voith Sulzer Papiermasch Gmbh Trockenpartie
US6065222A (en) * 1996-02-28 2000-05-23 Valmet Corporation Dryer sections with intermediate calendering in a paper machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19604675C2 (de) * 1996-02-09 2001-04-26 Voith Sulzer Papiermasch Gmbh Maschine zur Herstellung einer Faserstoffbahn

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5127168A (en) * 1989-07-20 1992-07-07 Pulp And Paper Research Institute Of Canada Method for manufacture of smooth and glossy papers and apparatus
DE19602697A1 (de) * 1995-12-22 1997-06-26 Voith Sulzer Papiermasch Gmbh Trockenpartie
US6065222A (en) * 1996-02-28 2000-05-23 Valmet Corporation Dryer sections with intermediate calendering in a paper machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1775377A1 (fr) * 2005-10-13 2007-04-18 Voith Patent GmbH Agencement de presse

Also Published As

Publication number Publication date
DE10131346A1 (de) 2003-01-09

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