EP1564328A1 - Séchage de bande par air chaud - Google Patents

Séchage de bande par air chaud Download PDF

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Publication number
EP1564328A1
EP1564328A1 EP05100330A EP05100330A EP1564328A1 EP 1564328 A1 EP1564328 A1 EP 1564328A1 EP 05100330 A EP05100330 A EP 05100330A EP 05100330 A EP05100330 A EP 05100330A EP 1564328 A1 EP1564328 A1 EP 1564328A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
hot air
drying
hot
air
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Withdrawn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
EP05100330A
Other languages
German (de)
English (en)
Inventor
Antje Stein
Roland Mayer
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 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 EP1564328A1 publication Critical patent/EP1564328A1/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Withdrawn legal-status Critical Current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
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • 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

Definitions

  • the invention relates to a method for drying a paper, board, tissue or another fibrous web in a machine for manufacturing and / or finishing the same at least partially by blowing one side of the fibrous web with Hot air and simultaneous support of the other side of the fibrous web.
  • the invention also relates to a device for drying a paper, cardboard, Tissue or other fibrous web in a machine for production and / or refinement thereof at least in sections by blowing a page the fibrous web with hot air by means of at least one hot air hood and simultaneous support of the other side of the fibrous web via at least one Supporting.
  • the drying of the fibrous web takes place by contact with heated drying cylinders.
  • the fibrous web is usually from a Drying screen passed over several heated drying cylinders and guide rollers. If, As often happens, the drying cylinders only on a certain side of the Fibrous web are arranged, so arises in the fibrous web a pronounced curl.
  • the object of the invention is therefore the dry performance at the lowest possible Increase curl of the fibrous web.
  • both sides of the Fibrous web are successively blown with hot air. These are both Sides of the fibrous web successively at least one hot air hood and on the opposite side of the fibrous web at least one corresponding Assigned supporting element.
  • the drying performance can be increased by the fact that both sides of the Fiber web are alternately blown alternately with hot air several times. This means that both sides of the fibrous web repeatedly in succession alternating hot air hoods are assigned.
  • the Drying relatively equilateral, so that is an approximately symmetrical moisture distribution across the thickness of the fibrous web with no or only very little tendency to curl established.
  • the drying is also very intense due to the hot air blowing, so that the Drying section in contrast to drying cylinder arrangements with comparable Drying result can be made much shorter.
  • the fibrous web should be able to control the hot air independently Heating capacity of the hot air hoods at least with respect to both sides of the Be fibrous web independently controllable. This is the heating power from the blown on the fibrous web amount of hot air per unit time and the Temperature of the hot air determined.
  • one side of the fibrous web can be used to reduce curl be more strongly dried over the hot air than the other.
  • the support of the fibrous web takes place on the hot air blowing through the hot air hood opposite side of the fibrous web via at least one support element.
  • This support element can be formed by a surface, in particular a roller or a belt or by a compressed air cushion of a blower hood.
  • this roller is designed as a suction roller.
  • This suction roll usually has a perforated roll shell Interior is connected to a vacuum source. It is however to Vacuum generation in the wrap area also possible, the outer To provide circumferential surface of the suction roll with circumferential grooves and this via a in non-enveloped area to vacuum suction hood arranged.
  • the negative pressure causes on the one hand the tightening of the fibrous web to the suction roll and thus an improved guidance of the fibrous web in the wrapping area and on the other hand the suction of the hot air.
  • the hot air can with appropriate Design of the fibrous web also pass through this into the suction roll, which significantly improves drying.
  • the suction roll should have a diameter of at least 2.5 m. So that the perforation of the suction roll is not negative on the surface of the fibrous web and the fibrous web easily From the area of the suction roll can be performed, the suction roll of an air-permeable belt, in particular a drying wire, which runs between the suction roll and the fibrous web.
  • the hot air of the hot air hood has a temperature between 100 and 500 ° C and an exit velocity of 50 to 110 m / s.
  • the hot air blowing with the hot air hoods in one After-dryer section of the machine is one Surface applicator, for example, for gluing or painting the Subordinate fibrous web.
  • the fibrous web before the first hot air blowing with the first Hot air hood in the after-dryer section a dry content between 70 and 85% have.
  • Hot air blowing with the hot air hoods Drying capacity and space requirements should be used as optimally as possible Hot air blowing with the hot air hoods the predominant drying power, preferably provide at least 90% of the drying capacity of the after-dryer section.
  • the fibrous web should in the after-dryer section for drying not only on hot-air hoods but also over heated drying cylinders become.
  • the wrap of 2 to 6 drying cylinders is sufficient, the Drying cylinder because of the simplified waste removal under the fibrous web should be arranged.
  • the fibrous web 1 passes to a main drying to a Coating device in the form of a size press 9, thereby giving her Dry content reduced again to values between 70 and 85%.
  • the floating dryer 8 is the beginning of the after-dryer section of the paper machine and can take long stretches between the size press and the following area of the Bridge hot air blowing.
  • the floating dryer may also omitted.
  • the first hot-air hood 2 is arranged below the fibrous web 1, this is executed in two parts, so as to remove the waste in a demolition and the Cleaning by pivoting away the hood parts to allow.
  • the suction rollers 3 have in the non-banded area 4 a band Vacuum hood 11, which sucks the circumferential grooves of the respective suction roll 3. This negative pressure in the grooves is sufficient to the fibrous web 1 im Wrap around band 4, resulting in improved guidance the fibrous web 1 leads.
  • the diameter of the suction rolls is in the range between 2.5 and 5 m.
  • the hot air of the hot air hoods has a discharge speed between 50 and 110 m / s and a temperature in the range of 150 to 500 ° C.
  • the fibrous web 1 Since the fibrous web 1 is blown from both sides with hot air, one turns relatively symmetrical moisture distribution over the thickness of the fibrous web 1 a. to Reduction of a curl can also make a side more intense with hot air be dried as the other.
  • the heating power of the two Hot air hoods 2 i. the amount of the fibrous web 1 per unit time blown hot air and their temperature separately controllable.
  • the band 4 of the first suction roll 3 performs the Fiber web 1 to the wrap of the band 4 of the second Suction roll 3.
  • the negative pressure of the second suction roll 3 supports the Takeover of the fibrous web 1.
  • This dryer 6 then passes the fibrous web 1 over a heated Drying cylinder 5, a guide roller 13 and a second heated drying cylinder. 5 Both drying cylinders 5 are below the fibrous web 1 and the guide roller 13 via arranged the fibrous web 1. The drying wire 6 presses the fibrous web 1 against the lateral surface of the drying cylinder. 5

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  • Paper (AREA)
EP05100330A 2004-02-14 2005-01-20 Séchage de bande par air chaud Withdrawn EP1564328A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004007261 2004-02-14
DE200410007261 DE102004007261A1 (de) 2004-02-14 2004-02-14 Bahntrocknung

Publications (1)

Publication Number Publication Date
EP1564328A1 true EP1564328A1 (fr) 2005-08-17

Family

ID=34684053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05100330A Withdrawn EP1564328A1 (fr) 2004-02-14 2005-01-20 Séchage de bande par air chaud

Country Status (2)

Country Link
EP (1) EP1564328A1 (fr)
DE (1) DE102004007261A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5921000A (en) * 1997-01-27 1999-07-13 Beloit Technologies, Inc. Alternating top and bottom felted dryers connected without open draw
US6365004B1 (en) * 1997-12-18 2002-04-02 Metso Paper, Inc. Method and apparatus for drying a paper web
WO2002044469A1 (fr) * 2000-11-30 2002-06-06 Metso Paper, Inc. Procede et dispositif pour machine a papier ou a carton
WO2004099495A1 (fr) * 2003-05-08 2004-11-18 Metso Paper, Inc. Procede pour controler le roulage de papier lors du traitement de papier surface et unite de finition d'une machine a papier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5921000A (en) * 1997-01-27 1999-07-13 Beloit Technologies, Inc. Alternating top and bottom felted dryers connected without open draw
US6365004B1 (en) * 1997-12-18 2002-04-02 Metso Paper, Inc. Method and apparatus for drying a paper web
WO2002044469A1 (fr) * 2000-11-30 2002-06-06 Metso Paper, Inc. Procede et dispositif pour machine a papier ou a carton
WO2004099495A1 (fr) * 2003-05-08 2004-11-18 Metso Paper, Inc. Procede pour controler le roulage de papier lors du traitement de papier surface et unite de finition d'une machine a papier

Also Published As

Publication number Publication date
DE102004007261A1 (de) 2005-09-15

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