EP2106479A1 - Disposition de séchage - Google Patents

Disposition de séchage

Info

Publication number
EP2106479A1
EP2106479A1 EP07821322A EP07821322A EP2106479A1 EP 2106479 A1 EP2106479 A1 EP 2106479A1 EP 07821322 A EP07821322 A EP 07821322A EP 07821322 A EP07821322 A EP 07821322A EP 2106479 A1 EP2106479 A1 EP 2106479A1
Authority
EP
European Patent Office
Prior art keywords
drying
drying cylinder
cylinder
arrangement according
fibrous web
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Withdrawn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
EP07821322A
Other languages
German (de)
English (en)
Inventor
Herbert Boden
Robert Attwenger
Rainer Kloibhofer
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 EP2106479A1 publication Critical patent/EP2106479A1/fr
Withdrawn legal-status Critical Current

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
    • D21F5/004—Drying webs by contact with heated surfaces or materials
    • 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
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D21F5/044—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using air hoods over the cylinders

Definitions

  • the invention relates to a drying arrangement for drying a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same with at least one heated drying cylinder, which is partially looped around by the fibrous web and at least one outer support band. and an overpressure hood which can be acted upon by the drying cylinder in the area of the loop with a pressurized liquid or gaseous medium, wherein the temperature of the medium is lower than the temperature on the outside of the drying cylinder in the wrapping area and at least one supporting band immediately before and / or after the wrapping around the drying cylinder a guide roller is guided.
  • the object of the invention is therefore to reduce the stress on the belts in such a drying arrangement without impairing the drying performance.
  • this object is achieved in that the diameter of the drying cylinder is greater than 1, 5 m, the diameter of the guide roll greater than 400 mm and the wrap angle of the support band is greater than 150 °.
  • the relatively large diameters of the drying cylinder and the guide roll ensure a minimal bending stress on the belts and at the same time allow a large wrap angle.
  • the extensive looping of the drying cylinder through the fibrous web and the support belt is not only the basis for a long drying section, but also a minimization of the load on the drying cylinder.
  • the diameter of the guide roller is greater than 500 mm.
  • the diameter of the drying cylinder should be greater than 2 m, preferably greater than 2.5 m.
  • the advantages according to the invention are particularly noticeable in drying cylinders that are at least 2.5 m long.
  • a very effective use results when the fibrous web has a dry content between 55 and 80% before the wrapping of the drying cylinder.
  • the temperature of the liquid or gaseous medium is lower than the temperature on the outside of the material web and the support band Enveloped partial circumference of the cylinder, a high liquid discharge can be achieved from the fibrous web.
  • the support belt and the voltage applied to the support side of the fibrous web are cooled by the medium, so that sets a temperature gradient of the heated cylinder in the direction of the support belt.
  • both the heat flow is increased and set the discharge of the partially emerging as a vapor from the fibrous web liquid.
  • the liquid therefore preferably exits the fibrous web on the side resting against the support band.
  • second support band is guided around the outside of the cylinder, which preferably has a coarser structure than the first support band.
  • the second support belt is guided in such a way that the first support belt is arranged between the fibrous web and the second support belt.
  • the second support belt is cooled directly with the pressurized medium, whose temperature is lower than that of the first support belt, so that the emerging as a vapor from the fibrous web fluid condenses in the second support band as condensate.
  • the steam emerging from the fibrous web thus initially penetrates the porous first support band and is absorbed by the second support band, so that rewetting of the fibrous web can practically be ruled out.
  • the support bands usually have a fabric-like structure.
  • the fabric may have intertwined filaments, for example filaments consisting of several monofilaments.
  • structure is understood to mean the structure of the fabric, that is, a support band having a coarse structure has larger spaces between the interlaced filaments than a support band having a finer structure whose filaments are more closely intertwined.
  • the first support band, against which the fibrous web rests, thus has a finer structure than the second support band, so that markings of the fibrous web can be safely avoided.
  • an "impermeable sealing tape” is understood to mean a fluid-impermeable and / or gas-impermeable band.
  • At least one support band is arranged, which serves to receive the liquid emerging from the fibrous web. Due to the impermeability of the sealing tape, the media pressure applied externally to the sealing band can be transmitted in a defined manner to the supporting band without the medium being in communication with the fibrous web.
  • the fibrous web is pressed onto the circumference of the cylinder, which leads to an increased heat transfer from the cylinder to the fibrous web and thus increases the discharge rate of the liquid bound in the fibrous web.
  • the fibrous web is compressed by the media pressure and thus significantly improves their web properties.
  • an embodiment of the drying arrangement is preferred in which the first support belt, the second support belt and / or the sealing tape between the drain region, in which the tapes / tape run off the cylinder, and the casserole area, in which the tapes / the band on emerge from the cylinder, out of the pressure chamber of the pressure hood is / is performed.
  • This can be a good one Accessibility of the guide rollers over which the belts are guided, be ensured.
  • the construction of the pressure hood can be simplified.
  • an embodiment of the drying arrangement is preferred in which the seals, for example sealing strips, by means of which the pressure chamber of the overpressure hood is sealable with respect to the environment, cooperate contactless or touching with rollers over which at least one belt and / or the fibrous web is guided.
  • the support belt and / or the sealing tape should preferably be performed immediately before and after the wrapping of the drying cylinder over at least one guide roll.
  • the roll shell of this drying cylinder should have a surface temperature of more than 115 ° C, preferably of more than 128 ° C.
  • the drying cylinder is heated with a hot fluid, preferably steam, wherein the internal pressure in the fluid space of the high-performance drying cylinder is above 4 bar, preferably above 6 bar.
  • drying arrangements are present in the dryer section. In this case, other drying elements can be arranged between these drying arrangements.
  • the fibrous web 1 After the fibrous web 1 has been heated to a temperature of at least 75 ° C, it can be a high-performance drying arrangement for Intensification of the drying and solidification of the fibrous web 1 can be supplied.
  • This drying arrangement is formed here by way of example of a heated drying cylinder 2, which is looped around by the fibrous web 1 and a support belt 5.
  • the support band 5 is porous and water absorbent.
  • an impermeable sealing strip 6 is led around on the outside, which is acted upon by a pressure-pressure hood 4 with a pressurized, gaseous or liquid medium.
  • the overpressure hood 4 is sealed against the sealing strip 6.
  • the medium has a lower temperature than the lateral surface of the drying cylinder 2, so that forms a temperature gradient between them.
  • the pressurization not only improves the contact with the hot jacket surface, but also leads to a solidification of the fibrous web 1 associated with an increase in strength.
  • the more than 3 m long drying cylinder 2 has a diameter of about 2.5 m and is wrapped by the fibrous web 1, the support band 5 and the sealing strip 6 here by way of example with an angle of more than 270 °.
  • This large wrap has not only a long admission section for the overpressure hood 4 but also a reduced resulting load of the drying cylinder 2 of the pressure hood 4 result.
  • the bands are guided 5.6 with the fibrous web 1 by a respective guide roller 3, whose diameter is greater than 500 mm. This relatively large diameter keeps the bending stress of the bands 5,6 minimal.
  • the drying arrangement requires relatively little space and allows intensive drying.
  • the dry content of the fibrous web 1 should be between 55 and 80% at the beginning of the high-performance drying unit for utilizing the advantages.
  • additional bands can also be arranged between the fibrous web 1 and the drying cylinder 2, which, however, should have good thermal conductivity.
  • the lateral surface of the drying cylinder 2 has a surface temperature of more than 125 ° C.
  • the heating takes place via water vapor whose pressure in the drying cylinder 2 reaches over 4 bar.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne une disposition de séchage pour le séchage d'une bande (1) de papier, de carton, de tissu ou d'une autre matière fibreuse dans une machine en vue de la fabrication et/ou du finissage de celle-ci avec au moins un cylindre sécheur (2) chauffé, qui est partiellement enserré par la bande (1) de matière fibreuse et au moins une bande de soutien (5) située à l'extérieur, et un capot à surpression (4) pouvant être alimenté avec un milieu liquide ou gazeux sous pression dans la zone d'enserrage du cylindre sécheur (2), la température du milieu étant plus faible que la température au niveau de la face extérieure du cylindre sécheur (2), dans le secteur d'enserrage, et au moins une bande d'appui (5) étant guidée par l'intermédiaire d'un rouleau d'orientation (3) immédiatement avant et/ou après l'enserrage du cylindre sécheur (2). La sollicitation du cylindre sécheur (2) doit en outre être réduite par le fait que le diamètre du cylindre sécheur (2) est supérieur à 1,5 m, que le diamètre du rouleau d'orientation (3) est supérieur à 400 mm et que l'angle d'enserrage de la bande d'appui (5) est supérieur à 150°.
EP07821322A 2006-10-30 2007-10-15 Disposition de séchage Withdrawn EP2106479A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006051052A DE102006051052A1 (de) 2006-10-30 2006-10-30 Trocknungsanordnung
PCT/EP2007/060955 WO2008052876A1 (fr) 2006-10-30 2007-10-15 Disposition de séchage

Publications (1)

Publication Number Publication Date
EP2106479A1 true EP2106479A1 (fr) 2009-10-07

Family

ID=38719405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07821322A Withdrawn EP2106479A1 (fr) 2006-10-30 2007-10-15 Disposition de séchage

Country Status (5)

Country Link
US (1) US20090165332A1 (fr)
EP (1) EP2106479A1 (fr)
AU (1) AU2007316308A1 (fr)
DE (1) DE102006051052A1 (fr)
WO (1) WO2008052876A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101974895B1 (ko) * 2018-10-04 2019-05-07 강원대학교산학협력단 압착 가열 기상 그라프팅 소수화 장치 및 이를 이용하여 제조한 내열수성 종이 및 유흡착 종이

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19723163A1 (de) * 1997-06-03 1998-12-10 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE10137095A1 (de) * 2001-07-30 2003-02-13 Voith Paper Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
DE102004017809A1 (de) * 2004-04-13 2005-10-27 Voith Paper Patent Gmbh Trockenanordnung
DE102005000793A1 (de) * 2005-01-05 2006-07-13 Voith Paper Patent Gmbh Stützband

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008052876A1 *

Also Published As

Publication number Publication date
US20090165332A1 (en) 2009-07-02
DE102006051052A1 (de) 2008-05-08
AU2007316308A1 (en) 2008-05-08
WO2008052876A1 (fr) 2008-05-08

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