EP1746203A1 - Section de séchage - Google Patents

Section de séchage Download PDF

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Publication number
EP1746203A1
EP1746203A1 EP06114301A EP06114301A EP1746203A1 EP 1746203 A1 EP1746203 A1 EP 1746203A1 EP 06114301 A EP06114301 A EP 06114301A EP 06114301 A EP06114301 A EP 06114301A EP 1746203 A1 EP1746203 A1 EP 1746203A1
Authority
EP
European Patent Office
Prior art keywords
drying
fibrous web
section
drying section
dryer
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.)
Granted
Application number
EP06114301A
Other languages
German (de)
English (en)
Other versions
EP1746203B1 (fr
Inventor
Frank Wegehaupt
Dominik Mai
Holger Humberg
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 EP1746203A1 publication Critical patent/EP1746203A1/fr
Application granted granted Critical
Publication of EP1746203B1 publication Critical patent/EP1746203B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21F5/02—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
    • D21G7/00—Damping devices

Definitions

  • the invention relates to a drying section for drying a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same with at least one single-row dryer group in which the fibrous web supported by a band, alternately heated by drying cylinders and between these arranged guide rollers is guided, wherein only one side of the fibrous web comes into contact with the drying cylinders of the respective drying group and from which the fibrous web is subsequently fed to a winding device.
  • the object of the invention is therefore to simplify the web guide without supplying the winding device an over-dried fibrous web.
  • this object is achieved in that the fibrous web is dried in the dryer section to a dry content between 95 and 99% and then rewetted via at least one moistening again to a dry content at which the fibrous web at the end of the dryer section a dry content between 87 and 94 % Has.
  • the rewetting within the dryer section not only makes the machine shorter overall, but it also makes it possible to use the stable web guide within the single-tier dryer group during rewet.
  • the moistening device should be designed as a nozzle moistener.
  • the nozzle wetnerthesed at least 40 nozzles per meter of web width.
  • the droplet size of the water sprayed from the nozzle moistener is less than 200 ⁇ m. This not only allows a uniform distribution of the water, it also provides for a short period of time for the moisture balance over the web width.
  • the fibrous web can be wound up immediately after drying with the desired dry content.
  • the moisture content of the fibrous web should be measured by a moisture meter before rewetting.
  • the measurement of the moisture content after the rewetting also allows conclusions about the moisture content before rewetting on the amount of water applied to the moistening device.
  • the arrangement of the moisture meter designed after the dryer section much easier and more accurate, since the moisture has penetrated at least substantially already in the fibrous web.
  • the properties of the fibrous web are to be made uniform. However, before winding, the dry content must be reduced again to the desired value. In order to ensure sufficient overdrying, the moisture content of the fibrous web should be increased by at least 7-12% by rewetting.
  • the moistening device should be arranged in the last single-row dryer section of the dryer section.
  • this may not necessarily be the last dryer section of the dryer section, especially if the dryer section also has double-tier dryer sections in which the fibrous web is passed over two rows of heated dryer cylinders with both sides of the fibrous web in contact therewith.
  • the drying section as a whole is simplified in construction, if this only has single-row drying groups.
  • the moistening device is arranged in the region of the last, preferably evacuated, guide roller of the corresponding dryer group. As a result, the fibrous web still comes into contact with the last drying cylinder of the dryer group, which assists penetration of the moisture into the fibrous web.
  • the fibrous web 1 is transferred to a drying section 2 of the paper machine for drying.
  • This drying section 2 consists here by way of example of several single-row dryer groups 4,5.
  • the fibrous web 1 is supported by a belt 9 in the form of a drying wire of the respective drying group 4, 5, alternately guided over heated drying cylinders 6 and guide rollers 7 arranged between them.
  • the drying cylinders 6 are arranged in one row and here below the fibrous web 1. This means that only the underside of the fibrous web 1 comes into contact with the lateral surface of the drying cylinder 6.
  • This arrangement is simple in construction and facilitates the removal of web remnants and the like, which is why one-sided drying can be accepted.
  • the fibrous web 1 is transferred with a dry content of about 90% to a following winding device 3 for winding the fibrous web 1.
  • the fibrous web 1 is overdried to a solids content of over 97%. This leads to a homogenization of the moisture profile of the fibrous web 1 and thus also to a reduction in the curl of the fibrous web 1 and a reduction of cockling.
  • a moistening device in the form of a nozzle moistener 8 which is arranged in the region of the last, evacuated guide roller 7 of the last drying group 5 of the dryer section 2, is used.
  • the nozzle moistener 8 has more than 40 water nozzles per meter of web width and in addition air atomizing nozzles to moisten the fibrous web 1 with water having a droplet size of less than 200 microns.
  • the distance between the dry moisture carrier 8 and the fibrous web 1 also remains constant.
  • the moisture content is increased by more than 7%.
  • the fibrous web 1 runs unsupported. This also allows a simple way of measuring the moisture content via a moisture meter 10 in this area.

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  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
EP06114301A 2005-07-21 2006-05-22 Section de séchage Not-in-force EP1746203B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005034065A DE102005034065A1 (de) 2005-07-21 2005-07-21 Trockenpartie

Publications (2)

Publication Number Publication Date
EP1746203A1 true EP1746203A1 (fr) 2007-01-24
EP1746203B1 EP1746203B1 (fr) 2009-10-14

Family

ID=37074188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06114301A Not-in-force EP1746203B1 (fr) 2005-07-21 2006-05-22 Section de séchage

Country Status (3)

Country Link
EP (1) EP1746203B1 (fr)
AT (1) ATE445732T1 (fr)
DE (2) DE102005034065A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726353A2 (fr) * 1995-02-01 1996-08-14 Valmet Corporation Procédé de fabrication de papier à surfaces travaillées et partie sèche d'un machine à papier
WO1998044191A1 (fr) * 1997-03-27 1998-10-08 Valmet Corporation Procede pour empecher le gondolage du papier dans la secherie d'une machine a papier et d'une machine a papier ou a carton
DE20019719U1 (de) * 2000-11-21 2001-03-01 Valmet Corp Anordnung bei der Bahnaufführung in der Papiermaschine
EP1486610A1 (fr) * 2003-06-13 2004-12-15 Voith Paper Patent GmbH Dispositif pour la fabrication et/ou le traitement d'une bande de matériau fibreux
DE10325572A1 (de) * 2003-06-05 2004-12-23 Voith Paper Patent Gmbh Vorrichtung und Verfahren zur Herstellung und/oder Behandlung einer Faserstoffbahn

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726353A2 (fr) * 1995-02-01 1996-08-14 Valmet Corporation Procédé de fabrication de papier à surfaces travaillées et partie sèche d'un machine à papier
WO1998044191A1 (fr) * 1997-03-27 1998-10-08 Valmet Corporation Procede pour empecher le gondolage du papier dans la secherie d'une machine a papier et d'une machine a papier ou a carton
DE20019719U1 (de) * 2000-11-21 2001-03-01 Valmet Corp Anordnung bei der Bahnaufführung in der Papiermaschine
DE10325572A1 (de) * 2003-06-05 2004-12-23 Voith Paper Patent Gmbh Vorrichtung und Verfahren zur Herstellung und/oder Behandlung einer Faserstoffbahn
EP1486610A1 (fr) * 2003-06-13 2004-12-15 Voith Paper Patent GmbH Dispositif pour la fabrication et/ou le traitement d'une bande de matériau fibreux

Also Published As

Publication number Publication date
DE502006005077D1 (de) 2009-11-26
EP1746203B1 (fr) 2009-10-14
ATE445732T1 (de) 2009-10-15
DE102005034065A1 (de) 2007-01-25

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