EP2006443A2 - Correction de l'humidité d'un profil transversal - Google Patents

Correction de l'humidité d'un profil transversal Download PDF

Info

Publication number: EP2006443A2
Authority: EP; European Patent Office
Prior art keywords: fibrous web; pressure medium; dewatering; dewatering belt; moisture
Prior art date: 2007-06-22
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

EP08154256A

Other languages

German (de)

English (en)

Other versions

EP2006443B1 (fr

EP2006443A3 (fr

Inventor

Daniel Gronych

Georg Dr. Kleiser

Robert Koplin

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.)

2007-06-22

Filing date

2008-04-09

Publication date

2008-12-24

2008-04-09 Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH

2008-12-24 Publication of EP2006443A2 publication Critical patent/EP2006443A2/fr

2011-10-19 Publication of EP2006443A3 publication Critical patent/EP2006443A3/fr

2013-01-30 Application granted granted Critical

2013-01-30 Publication of EP2006443B1 publication Critical patent/EP2006443B1/fr

Status Not-in-force legal-status Critical Current

2028-04-09 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
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
- D21F7/12—Drying
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/003—Indicating or regulating the moisture content of the layer

Definitions

the invention relates to a method and a device for influencing the moisture profile of a paper, cardboard, tissue or other fibrous web in the press section for dewatering the fibrous web of a machine for producing and / or finishing the same, in which the fibrous web together with at least one water-absorbing drainage tape passes through at least one press nip.
the fibrous web is then rewetted to achieve a uniform moisture profile as possible again.
the dewatering belts are thoroughly cleaned and dried during their circulation. This is intended to ensure the greatest possible water absorption capacity and takes place predominantly with spray pipes, pipe sucker or the like.
the object of the invention is therefore to equalize the moisture profile of the fibrous web in the press section with the least possible effort.
this object is achieved in that at least one dewatering belt after the removal of the fibrous web from at least one nozzle arrangement in a transverse to the web running direction extending correction section in which the moisture content of the fibrous web too high or too is low, with a gaseous pressure medium, in particular compressed air or water vapor is applied, wherein the pressure medium is directed to the side of the dewatering belt in contact with the fibrous web, if the moisture content of the fibrous web in this correction section is too high and the pressure medium on the is not directed to the fibrous web in contact side of the dewatering belt, if the moisture content of the fibrous web is too low in this correction section.
a gaseous pressure medium in particular compressed air or water vapor
the water present in the dewatering belt can be pressed to the side in contact with the fibrous web or away from it.
the water in the dewatering belt is pressed towards the opposite side.
the belt side coming into contact with the fibrous web is drier and thus more receptive to the water pressed out of the fibrous web in the press nip.
the corresponding area of the fibrous web is dewatered more than the others, so that unequal moisture distributions in the fibrous web can be compensated over the web width.
the pressure medium is not applied to the side not coming into contact with the fibrous web, then the water present in the dewatering belt is pressed to the side coming into contact with the fibrous web.
the dewatering belt can absorb less water in this correction section, so that the fibrous web is also less strongly dewatered.
dewatering belts In order to be able to influence the moisture cross profile as much as possible, several dewatering belts, preferably all dewatering belts, should be charged with the pressure medium.
the effect can be increased if the drainage tapes are exposed to the pressure medium at several points along the circumference.
the pressure medium should be directed to the drainage belt at a pressure of between 3 and 20 bar, preferably between 5 and 20 bar.
the temperature of the pressure medium should be between 5 and 150 ° C, preferably between 10 and 100 ° C and in particular between 10 and 50 ° C.
the correction section in order to limit the energy required for pressurizing medium, it is usually sufficient for the correction section to be exposed to the pressure medium for a period of between 30 seconds and 60 minutes, preferably between 2 minutes and 15 minutes.
the moisture transverse profile of the fibrous web should preferably be measured after the press section, in particular after a pre-drying section or a winder, and the pressure medium applied should be controlled accordingly.
the angle of the discharge of the pressure medium from the dewatering belt with respect to the strip running direction between 30 and 150 °, preferably between 30 and 90 ° and in particular between 45 and 90 ° and with respect to the machine width between 1 and 90 °, preferably between 30 and 90 ° and in particular between 45 and 90 °.
the intensity of the pressure medium applied should also be controllable.
the nozzle arrangement has a plurality of nozzles, preferably a maximum of 5 Includes nozzles.
the nozzles of the nozzle arrangement should have a round, preferably oval nozzle opening or be designed as flat nozzles.
the maximum nozzle opening between 1 and 100 mm, preferably between 10 and 25 mm.
the distance between the nozzles of the nozzle assembly and the dewatering belt should be between 3 and 50 mm, preferably between 5 and 20 mm.
the nozzle arrangement is designed to be traversable. In this way, the nozzle assembly can apply all possible correction sections to the pressure medium.
the fibrous web is preferably performed together with both sides each have a dewatering belt through this press nip.
both dewatering belts for correcting the moisture profile of the fibrous web should be applied to the pressure medium in these press sections.
the dewatering belt running under the fibrous web is subjected to the pressure medium to correct the moisture transverse profile of the fibrous web, which minimizes the expense.
the dewatering belt (s) should be pressurized with the medium that has been in contact with the fibrous web for the longest time.
the over-drying of the fibrous web in the dryer section by a balanced moisture profile of the fibrous web which reduces energy consumption.
FIG. 1 shows a schematic cross section through a press section of a paper machine for dewatering the fibrous web 1 with only one press nip.
the fibrous web 1 runs together with an air-permeable, water-absorbing dewatering band 4, 5 in the form of a press felt, on both sides.
the upper dewatering belt 4 takes over the fibrous web 1 from a forming wire 9 of an upstream former for sheet formation.
the fibrous web 1 runs together with both dewatering belts 4, 5 over a guide path until then the upper dewatering belt 4 is led away from the fibrous web 1.
the lower dewatering belt 5 transfers the fibrous web 1 to an air-permeable drying wire 10 of a drying group following in the web running direction 14.
This drying wire 10 leads the fibrous web 1 in the dry group meandering alternately over heated drying cylinders 12 and evacuated guide rollers 13.
the drying wire 10 presses the fibrous web 1 against the hot surface of the drying cylinder 12th
the fibrous web 1 is transferred to another drying wire 11 of a second drying group.
a measuring element 7 detects the moisture distribution in the fibrous web 1 and transmits the data to a control unit 8.
This control unit 8 acts on nozzle arrangements 6 which are assigned to the dewatering belts 4, 5.
These nozzle arrangements 6 comprise a plurality of nozzles with an oval nozzle opening and a suction device for possibly resulting spray mist.
the nozzles have a distance between 5 and 20 mm to the corresponding dewatering belt 4,5 and act on this with compressed air at a pressure between 5 and 20 bar.
the nozzle arrangements 6 are arranged traversable transversely to the web running direction 14.
both dewatering belts 4, 5 are each assigned a nozzle arrangement 6 following the routing away from the fibrous web 1.
the dewatering belts 4, 5 are pressurized with compressed medium in the form of compressed air in a correction section in position and extent transversely to the web running direction 14 of this strip equivalent.
the side of the dewatering belts not coming into contact with the fibrous web 1 becomes 4.5 and if the strip is too moist, the side of the dewatering belts 4, 5 coming into contact with the fibrous web 1 is subjected to compressed air.
the compressed air supply extends over a period of 2 to 15 minutes.
the compressed air is then stopped for approx. 15 min. If the moisture imbalance persists even after that, then another compressed air is applied.
traversing nozzle arrangement 6 it is also possible to use a series of preferably separate or at least in groups separately controllable nozzles which extend over the bandwidth.
controlling the pressure and the amount of compressed air supplied may be advantageous depending on the degree of moisture imbalance.

Landscapes

Paper (AREA)

EP20080154256 2007-06-22 2008-04-09 Correction de l'humidité d'un profil transversal Not-in-force EP2006443B1 (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE200710028951 DE102007028951A1 (de)	2007-06-22	2007-06-22	Feuchtequerprofilkorrektur

Publications (3)

Publication Number	Publication Date
EP2006443A2 true EP2006443A2 (fr)	2008-12-24
EP2006443A3 EP2006443A3 (fr)	2011-10-19
EP2006443B1 EP2006443B1 (fr)	2013-01-30

Family

ID=39790111

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP20080154256 Not-in-force EP2006443B1 (fr)	2007-06-22	2008-04-09	Correction de l'humidité d'un profil transversal

Country Status (2)

Country	Link
EP (1)	EP2006443B1 (fr)
DE (1)	DE102007028951A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10025240A1 (de) *	2000-05-22	2001-11-29	Voith Paper Patent Gmbh	Verfahren und Vorrichtung zur Feuchtequerprofil-Korrektur
US7452446B2 (en) *	2005-10-18	2008-11-18	Kimberly-Clark Worldwide, Inc.	Apparatus and method for dewatering a fabric
DE102005054999A1 (de) *	2005-11-18	2007-05-24	Voith Patent Gmbh	Vorrichtung zum Reinigen einer Papiermaschinenbespannung

2007
- 2007-06-22 DE DE200710028951 patent/DE102007028951A1/de not_active Withdrawn
2008
- 2008-04-09 EP EP20080154256 patent/EP2006443B1/fr not_active Not-in-force

Also Published As

Publication number	Publication date
DE102007028951A1 (de)	2008-12-24
EP2006443B1 (fr)	2013-01-30
EP2006443A3 (fr)	2011-10-19

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