EP1746203B1 - Section de séchage - Google Patents

Section de séchage Download PDF

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Publication number
EP1746203B1
EP1746203B1 EP06114301A EP06114301A EP1746203B1 EP 1746203 B1 EP1746203 B1 EP 1746203B1 EP 06114301 A EP06114301 A EP 06114301A EP 06114301 A EP06114301 A EP 06114301A EP 1746203 B1 EP1746203 B1 EP 1746203B1
Authority
EP
European Patent Office
Prior art keywords
drying
fibrous web
drying section
section
row
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.)
Not-in-force
Application number
EP06114301A
Other languages
German (de)
English (en)
Other versions
EP1746203A1 (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 document WO 98/44191 relates to a method for controlling the curl of paper in the dryer section of a paper or board machine. In the process, the paper web is steamed and / or moistened. Furthermore, the document relates to a paper or board machine which has at least one headbox, a forming section, a press section and a drying section in which steam blow boxes or humidifiers for curl control are used.
  • the document EPO 726 353 A2 relates to a process for the production of surface-treated paper, in particular of fine paper, as well as on the drying area of a paper machine for the production of surface-treated paper, which has a pre-drying section, this pre-drying section is followed online or offline by a section for finishing the paper web.
  • 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 % and the moistening device is designed as a nozzle moistener, wherein the nozzle moistener has at least 40 nozzles per meter of web width and the fibrous web is wound up immediately after drying with the desired dry content.
  • 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 is designed as a nozzle moistener.
  • the nozzle moistener has at least 40 nozzles per meter of web width.
  • the fibrous web is wound up immediately after drying with the desired dry content.
  • 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 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.

Landscapes

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

Claims (13)

  1. Section de séchage (2) pour le séchage d'une bande de papier, de carton, d'essuie-tout ou d'une autre matière fibreuse (1) dans une machine de fabrication et/ou de traitement de celle-ci, avec au moins un groupe de séchage (4, 5) à une rangée, dans lequel la bande de matière fibreuse (1) est soutenue par une bande (9) et est guidée en alternance sur des cylindres de séchage chauffés (6) et des rouleaux de déviation (7) disposés entre ceux-ci, dans laquelle seule une face de la bande de matière fibreuse (1) vient en contact avec les cylindres de séchage (6) du groupe de séchage respectif et la bande de matière fibreuse (1) est ensuite envoyée de celui-ci à un dispositif de bobinage (3), caractérisée en ce que la bande de matière fibreuse (1) est séchée dans la section de séchage (2) jusqu'à un niveau de siccité compris entre 95 et 99 % et est ensuite de nouveau humidifiée, au moyen d'au moins un dispositif d'humidification, jusqu'à un niveau de siccité, pour lequel la bande de matière fibreuse (1) présente à la fin de la section de séchage (2) un niveau de siccité compris entre 87 et 94 %, et le dispositif d'humidification est réalisé sous la forme d'un humidificateur à buses (8), dans laquelle l'humidificateur à buses (8) comprend au moins 40 buses par mètre de largeur de la bande et la bande de matière fibreuse est bobinée immédiatement après le séchage avec le niveau de siccité souhaité.
  2. Section de séchage (2) selon la revendication 1, caractérisée en ce que la réhumidification n'est effectuée que par un dispositif d'humidification.
  3. Section de séchage (2) selon la revendication 1, caractérisée en ce que la réhumidification est effectuée au moyen de plusieurs dispositifs d'humidification.
  4. Section de séchage (2) selon la revendication 1, caractérisée en ce que l'humidificateur à buses (8) comporte de simples buses à eau ou des buses à deux composants pour la pulvérisation.
  5. Section de séchage (2) selon l'une quelconque des revendications précédentes, caractérisée en ce que la taille des gouttelettes de l'eau pulvérisée par l'humidificateur à buses (8) est inférieure à 200 µm.
  6. Section de séchage (2) selon l'une quelconque des revendications précédentes, caractérisée en ce que la teneur en humidité de la bande de matière fibreuse (1) est mesurée par un hygromètre avant la réhumidification.
  7. Section de séchage (2) selon l'une quelconque des revendications précédentes, caractérisée en ce que la teneur en humidité de la bande de matière fibreuse (1) est mesurée par un hygromètre (10) après la réhumidification.
  8. Section de séchage (2) selon l'une quelconque des revendications précédentes, caractérisée en ce que la teneur en humidité de la bande de matière fibreuse (1) est accrue d'au moins 7 % par la réhumidification.
  9. Section de séchage (2) selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif d'humidification est disposé dans le dernier groupe de séchage à une rangée (5) de la section de séchage (2).
  10. Section de séchage (2) selon la revendication 9, caractérisée en ce que la section de séchage (2) présente aussi des groupes de séchage à deux rangées, dans lesquels la bande de matière fibreuse (1) est guidée sur deux rangées de cylindres de séchage chauffés (6), dans laquelle les deux faces de la bande de matière fibreuse (1) viennent en contact avec ceux-ci.
  11. Section de séchage (2) selon l'une quelconque des revendications 1 à 9, caractérisée en ce que le dispositif d'humidification est disposé dans l'avant-dernier groupe de séchage à une rangée (4) de la section de séchage (2).
  12. Section de séchage (2) selon l'une quelconque des revendications 1 à 9 ou 11, caractérisée en ce que la section de séchage (2) ne comprend que des groupes de séchage à une rangée (4, 5).
  13. Section de séchage (2) selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif d'humidification est disposé dans la région du dernier rouleau de déviation (7) du groupe de séchage correspondant (4, 5).
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 EP1746203A1 (fr) 2007-01-24
EP1746203B1 true 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)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI98387C (fi) * 1995-02-01 1997-06-10 Valmet Corp Menetelmä pintakäsiteltävän paperin, etenkin hienopaperin, valmistamiseksi sekä paperikoneen kuivapää
FI971301A (fi) * 1997-03-27 1998-09-28 Valmet Corp Menetelmä paperin käyristymän hallitsemiseksi paperikoneen kuivatusosalla ja paperi- tai kartonkikone
DE20019719U1 (de) * 2000-11-21 2001-03-01 Valmet Corp., Helsinki 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
DE10326763A1 (de) * 2003-06-13 2005-01-20 Voith Paper Patent Gmbh Vorrichtung zur Herstellung und/oder Behandlung einer Faserstoffbahn

Also Published As

Publication number Publication date
ATE445732T1 (de) 2009-10-15
EP1746203A1 (fr) 2007-01-24
DE502006005077D1 (de) 2009-11-26
DE102005034065A1 (de) 2007-01-25

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