EP2204491A1 - Procédé et dispositif de réglage du profil transversal d'humidité dans la zone de la partie tamis - Google Patents

Procédé et dispositif de réglage du profil transversal d'humidité dans la zone de la partie tamis Download PDF

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Publication number
EP2204491A1
EP2204491A1 EP09174361A EP09174361A EP2204491A1 EP 2204491 A1 EP2204491 A1 EP 2204491A1 EP 09174361 A EP09174361 A EP 09174361A EP 09174361 A EP09174361 A EP 09174361A EP 2204491 A1 EP2204491 A1 EP 2204491A1
Authority
EP
European Patent Office
Prior art keywords
water
fibrous web
dewatering
dewatering element
weight sensors
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Withdrawn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
EP09174361A
Other languages
German (de)
English (en)
Inventor
Jörg Spindler
Niels Hardt
Armin Dr. Bauer
Jens Haag
Oliver Dr. Kaufmann
Rudolf Münch
Hartmut Abel
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 EP2204491A1 publication Critical patent/EP2204491A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0027—Paper-making control systems controlling the forming section
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0036—Paper-making control systems controlling the press or drying section

Definitions

  • the invention relates to a method and a device for controlling a moisture profile of a fibrous web, in particular a paper, board or tissue web, between the headbox and the press section of a papermaking machine.
  • the pulp suspension is fed via the pulp exit nip of the headbox nozzle to a paper or board machine in the form of a fiber suspension jet onto the forming wire or into the nip between two forming wires.
  • the pulp exit nip determines the cross direction profile of the dispensed stock flow.
  • the basis weight profile, dilution water addition, and pulp exit nip can be controlled by the control system.
  • the control system consists of a process control computer or a similar logistics control device, a measuring device and a feedback loop, which constantly readjust the actuators / actuators via a nominal / actual comparison. From the prior art it is known that the measuring device for measuring the moisture content or the Water content can be positioned at various locations, such as in the press section or just before the reeling of the paper web.
  • the measuring methods known from the prior art measure various material properties with a measuring head which is moved in a zigzag manner over the paper web. That is, the measuring head measures a strip on the paper web which runs zigzag over the web. As a result, only a longitudinally very distorted cross profile can be measured and thus also regulated. Thus, it is almost impossible to differentiate between the process noise in the transverse direction, CD direction, and a measured value that makes a regulation necessary to achieve the desired value.
  • the drainage takes place in the wire section with the help of dewatering elements such as register rollers, foils, vacuum cleaner groups and / or a nonwoven fabric on the screens.
  • dewatering elements such as register rollers, foils, vacuum cleaner groups and / or a nonwoven fabric on the screens.
  • drainage takes place by a different type of drainage, such as hydromechanical, suction and / or capillary drainage.
  • the moisture cross profile with which the fibrous web enters the press section very uneven and in the press section this uneven moisture cross profile can be improved only with great energy expenditure, eg a controlled steamer Steambox.
  • a controlled steamer Steambox depends on the measurement results of the measuring devices and the measuring devices in the CD direction but only provide point measurements.
  • a control of the steambox takes place in accordance with the measured pointwise existing moisture and is also still subject to a dead time since the measurement usually takes place only behind the dryer section.
  • the object of the invention is to provide an improved method and apparatus that produces a fibrous web having a uniform wet transverse profile before the fibrous web passes through the press section.
  • the moisture profile of a fibrous web in the cross-machine direction or in the CD direction is regulated by the proposed method. It can be used in particular in machines for producing paper, board and tissue products, with a control system, with at least one headbox, one wire and one press section. At least one water-weight sensor is used to measure the moisture or the water content of the fibrous web and at least one dewatering element is present in the sieve area for dewatering.
  • These measured values control the water content of the fibrous web in the CD direction before entering the press section via the control system.
  • the moisture of the fibrous web is controlled by means of at least.
  • An adjustable dewatering element that is positioned in the press section before the inlet.
  • the measurement of the water content is preferably carried out continuously, but can also be done intermittently.
  • the dewatering elements are zoned in the CD direction and each dewatering zone is associated with an actuator controlled by the control system. and for adjusting the drainage performance of Drainage element zones serves.
  • the width of at least one drainage element zone forms an area in the CD direction, which is regulated by means of a water-weight sensor associated with the area.
  • the actuators are usually controlled by the drainage elements, which are arranged in the production direction behind the water-weight sensors, also known as feed-forward control.
  • fiber cross-profile control devices can be controlled which are located in the region of the press section and / or in the headbox.
  • the measurement with the water weight sensors takes place from the side of the screen which is remote from the fibrous web, so that the measurement of the water content of the fibrous web takes place through the sieve.
  • one or more CD control devices for fibrous web interference can be regulated.
  • the steambox and a suction box can be regulated so that there is a minimization of energy use.
  • a measured profile can be used for direct regulation or indirectly for offsetting with other CD profiles.
  • the Fig. 1 shows a side view of the basic structure of a papermaking machine for producing a fibrous web, which has two double-sided edge regions and a central region.
  • the papermaking machine shown has a headbox with a preferred mode of operation according to the dilution water principle (ModuleJet TM) for introducing at least one machine-width layer of a pulp suspension between two moving screens 13 (bottom wire, top wire) of a wire section 14.
  • the dilution water principle is from the German Offenlegungsschrift DE 40 19 593 A1
  • the content of this disclosure is hereby made the subject of the present description.
  • the fibrous web 12 formed and dewatered in the wire section 14 is transferred as a wet fibrous web 12 to a press section 16 consisting of two preferably double-felted (extended-nip) presses 16 each forming a press nip 23, 24 extended in the web running direction L (arrow) and there further dehydrated between the press felts 17.
  • the moist fibrous web 15 is transferred to a drying section 18 in a row adjacent drying cylinders 19 and dried under Neander run around the heated drying cylinder 19.
  • the fibrous web 15, now already a fibrous web passed through a calender 20 to a winding device 21 and wound there to form a winding roll 22.
  • Fig. 2 a schematic side view of a wire section with a sieve 13 is shown. From the pulp exit slit 30 of the headbox 1, the pulp suspension is applied to the wire 13. As soon as the pulp suspension is on the screen 13, the dewatering of the pulp suspension, represented by the thinning fibrous web 12, begins. The dewatering of the pulp suspension is assisted by various dewatering elements 5, which are each arranged on the side of the screen 13 which is remote from the fibrous web 12 such as foils, suction rolls, suction boxes and / or the nonwovens on the wire. In addition, various drainage elements 5 can be arranged one behind the other.
  • a dewatering element 5 is subdivided in the cross-machine direction into zones 3, each of which has a device which is adjustable by means of an actuator 2b or another adjustment device in such a way that the dewatering capacity of the dewatering element zone is changed.
  • the vacuum in the individual zones 3 can be so be changed, that in the individual zones 3 is applied a different degrees of vacuum.
  • the positions of the foils can be changed zone by zone.
  • the moisture cross profile is measured with a plurality of water weight sensors 4 arranged side by side in the cross machine direction and arranged in front of or behind a dewatering element 5 in the region of the wire section.
  • the determined values are compared with the desired values and the necessary adjustment of the actuators 2 is determined.
  • a water-weight sensor 4 via the control system can also control a plurality of actuators 2.
  • Fig. 3 is a plan view of the fibrous web 12 is shown and it can be seen that in each case a water-weight sensor 4 is assigned to several zones of a dewatering element 5, that covers a certain area 9 of the fibrous web 12 which regulated by the water-weight sensor 4 becomes. Whereby the regulation can also take place across sectors.
  • the measurement result of the water-weight sensors 4 can be used for a "feedforward” as well as for a “feedback” CD control. So it is possible that also actuators 2a; 2b, etc., to control other properties of the fibrous web 12 in the CD direction.
  • the pulp composition in the headbox 1 in the CD direction or the moistening of the fibrous web 12 by a steambox 7 in the press section 16 can be influenced.
  • Fig. 4 By way of example, a diagram with a possible Water-Weigth cross-section is shown, as it may appear, before the fibrous web 12 enters the press section 16.
  • the control of the steambox 7 can be influenced in the press section 16, which leads to a large energy saving when working with lower amounts of steam.

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  • Paper (AREA)
EP09174361A 2008-12-30 2009-10-28 Procédé et dispositif de réglage du profil transversal d'humidité dans la zone de la partie tamis Withdrawn EP2204491A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810055184 DE102008055184A1 (de) 2008-12-30 2008-12-30 Verfahren und Vorrichtung zur Regelung des Feuchtequerprofils im Bereich der Siebpartie

Publications (1)

Publication Number Publication Date
EP2204491A1 true EP2204491A1 (fr) 2010-07-07

Family

ID=42105898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09174361A Withdrawn EP2204491A1 (fr) 2008-12-30 2009-10-28 Procédé et dispositif de réglage du profil transversal d'humidité dans la zone de la partie tamis

Country Status (2)

Country Link
EP (1) EP2204491A1 (fr)
DE (1) DE102008055184A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200385927A1 (en) * 2017-11-27 2020-12-10 Voith Patent Gmbh Method for determining the dryness of a fibrous web, and method for controlling or regulating a machine for producing a paper web, and computer program for carrying out the methods

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999053134A1 (fr) * 1998-04-14 1999-10-21 Honeywell-Measurex Corporation Detecteur de turbulence et de masse d'eau sous toile
US6099690A (en) * 1998-04-24 2000-08-08 Honeywell-Measurex Corporation System and method for sheet measurement and control in papermaking machine
EP2096205A1 (fr) * 2008-02-11 2009-09-02 Voith Patent GmbH Procédé de drainage et dispositif de drainage

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4019593C2 (de) 1990-06-20 1994-01-20 Voith Gmbh J M Stoffauflauf für Papiermaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999053134A1 (fr) * 1998-04-14 1999-10-21 Honeywell-Measurex Corporation Detecteur de turbulence et de masse d'eau sous toile
US6099690A (en) * 1998-04-24 2000-08-08 Honeywell-Measurex Corporation System and method for sheet measurement and control in papermaking machine
EP2096205A1 (fr) * 2008-02-11 2009-09-02 Voith Patent GmbH Procédé de drainage et dispositif de drainage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200385927A1 (en) * 2017-11-27 2020-12-10 Voith Patent Gmbh Method for determining the dryness of a fibrous web, and method for controlling or regulating a machine for producing a paper web, and computer program for carrying out the methods
US11926963B2 (en) * 2017-11-27 2024-03-12 Voith Patent Gmbh Method for determining the dryness of a fibrous web, and method for controlling or regulating a machine for producing a paper web, and computer program for carrying out the methods

Also Published As

Publication number Publication date
DE102008055184A1 (de) 2010-07-01

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