EP2276886A2 - Dispositif de commande et/ou de régulation en ligne d'un profil transversal d'orientation des fibres - Google Patents

Dispositif de commande et/ou de régulation en ligne d'un profil transversal d'orientation des fibres

Info

Publication number
EP2276886A2
EP2276886A2 EP09745746A EP09745746A EP2276886A2 EP 2276886 A2 EP2276886 A2 EP 2276886A2 EP 09745746 A EP09745746 A EP 09745746A EP 09745746 A EP09745746 A EP 09745746A EP 2276886 A2 EP2276886 A2 EP 2276886A2
Authority
EP
European Patent Office
Prior art keywords
sheet
control
fiber orientation
headbox
fibrous web
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Withdrawn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
EP09745746A
Other languages
German (de)
English (en)
Inventor
Markus Häußler
Klaus Lehleiter
Susanne Berger
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 EP2276886A2 publication Critical patent/EP2276886A2/fr
Withdrawn legal-status Critical Current

Links

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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/06—Regulating pulp flow

Definitions

  • the invention relates to an apparatus for on-line control and / or regulation of a fiber orientation transverse profile of a running paper or board web in a paper machine comprising a headbox with a headbox nozzle.
  • the fiber orientation is usually measured by ultrasound as an average over the sheet thickness. Accordingly, the optimization so far on the total sheet thickness is done.
  • the fiber orientation is therefore considered on average over the sheet thickness (TSO) and optimized with means at the headbox over the entire headbox jet thickness or sheet thickness.
  • Measuring methods have already become known, mostly optical measuring methods, which enable online or offline fiber orientation measurements either on the upper side or on the lower side of the fibrous web.
  • optical measuring methods which enable online or offline fiber orientation measurements either on the upper side or on the lower side of the fibrous web.
  • separate measurements in x layers are also possible by means of corresponding offline measurement techniques.
  • fiber orientation is typically not constant across the sheet thickness, i. z-dimension.
  • the main fiber direction on the underside of the sheet may deviate from the main fiber direction on the upper side of the sheet.
  • the fiber shrinks during the drying process primarily in the plane perpendicular to the fiber longitudinal axis plane.
  • the fiber longitudinal axes on the upper side of the sheet offset by an angle to the underside of the sheet, this leads to a shrinkage process to tension in the sheet structure, which brings corresponding disturbances of the flatness with it.
  • a so-called diagonal curl a so-called MD curl, ie curl in the machine direction, or a so-called CD curl, ie curl in the transverse direction, can occur.
  • a headbox is already known, in which the edge-side turbulence ducts of the turbulence generator are each separated from the rest of the turbulence generator area and are each connected to a feed line for an edge flow in order to influence the fiber orientation profile resulting transversely to the machine direction.
  • the fiber orientation transverse profile is influenced by the velocity vector or velocity profile of the suspension jet.
  • a respective change in the fiber orientation transverse profile is detected by concluding a change in the fiber orientation transverse profile by means of a characteristic change in the basis weight cross profile or at least one measured variable correlating therewith.
  • the grammage profile is controlled via the consistency in the headbox to influence the fiber orientation.
  • the volume flow supplied to the headbox nozzle at the edge can be regulated by means of valves in order to influence the fiber orientation.
  • the invention has for its object to provide an improved device of the type mentioned, with which the tension in the sheet are reduced to a minimum and thus the best possible flatness of the produced web is guaranteed.
  • the device for on-line control and / or regulation thus comprises a measuring device for an in z-direction, i. Thickness direction of the current fibrous web sectioned online measurement of the fiber orientation cross profile.
  • the measuring device is designed so that for at least two layers of the fibrous web a separate online measurement of the relevant fiber orientation profiles takes place.
  • the device comprises adjusting means by means of which the fiber orientation transverse profiles of the various layers of the fibrous web can preferably be influenced at least partially separately.
  • the fiber orientation transverse profile of at least one layer can be influenced separately from the fiber orientation profile of at least one other layer.
  • the fiber orientation transverse profiles of all the layers can each be influenced separately from one another.
  • the measured values of fiber orientation profiles measured separately for different layers of the fibrous web can be used for the online control or regulation, as a result of which the relevant control or regulation is optimized accordingly.
  • a blade structure is achieved, in which the tension is reduced to a minimum are and with the best possible flat position of the finished web is guaranteed.
  • the measuring device comprises various measuring units, wherein for the different layers of the fibrous web at least partially separate measuring units are provided.
  • a preferred practical embodiment of the device according to the invention is characterized in that it comprises at least one, preferably a plurality of control circuits and / or closed-loop control, on the basis of the sectioned online measurement on the adjusting means assigned to different layers of the fibrous web, the Faserorient istsquerprofil of at least one Layer and preferably the Faserohent michsquerprofile of at least two layers separately to control or regulate and / or perform for the Faserorientie- rungsquerprofile of at least two layers of the fibrous web a combined control or regulation.
  • the measuring device is designed in such a way that a separate online measurement of the respective fiber transverse cross-sections takes place for the two layers of the fibrous web formed by the upper half of the sheet or upper side of the sheet and the lower half of the sheet or sheet underside.
  • the device expediently comprises at least one, preferably a plurality of control circuits and / or closed control loops, at least the fiber orientation transverse profile of the upper or the lower on the basis of the sectioned online measurement over the adjusting means assigned to the upper half of the sheet or upper side of the sheet or the lower side of the sheet Sheet half or side and / or the Faserorient istsquerprofile the upper half of the sheet or leaf top side and the lower half of the sheet or leaf underside each separately to control or regulate.
  • control and / or closed-loop control can be designed in particular for such a control or regulation of the two Faserohent istsquerprofile that both for the upper and for the lower half of the sheet or side for the various transversely successive control or Control sections each give a mean fiber angle zero representing the deviation from the machine direction (MD).
  • control and / or closed-loop control circuits can in particular also be designed so that the same or different predefinable target fiber orientation transverse profiles result for the upper half of the sheet or upper side of the sheet and the lower half of the sheet or underside of the sheet.
  • the device comprises at least one, preferably a plurality of control circuits and / or closed-loop control, on the basis of the sectioned online measurement over the upper half of the blade or leaf upper side and the lower half of the sheet or leaf underside associated adjusting the Faserorient istsquerprofile
  • the upper half of the sheet or upper side of the sheet and the lower half of the sheet or underside of the sheet combined to control or regulate, preferably to minimize the difference between the two Faserorientie- cross profiles.
  • At least one control and / or closed loop is provided, which is designed so that for one of the two halves of the sheet or pages, preferably the upper half of the sheet or sheet top, a specifiable target Faserohentleitersquerprofil results, and at least one control and / or closed loop is provided, which is designed so that a minimum difference between the Faserorient istsquerprofi len of the two halves of the sheet or sides results.
  • the adjusting means comprise one or more devices for feeding and / or withdrawing a respective one sectioned in the z-direction predeterminable volume flow in or out of the two lateral edge regions of the headbox of the head box.
  • a manipulated variable influencing the fiber orientation transverse profile of a respective layer can be formed, for example, by the edge-side volume flows.
  • the manipulated variable in question can be determined in particular by the flow rate of the peripheral volume flows.
  • the edge-side volume flows can be generated for example by stock suspension streams.
  • the adjusting means may also comprise a provided in the upper region of the outlet gap of the headbox upper adjustable aperture and / or provided in the lower region of the outlet gap of the headbox lower adjustable aperture.
  • a separating element can be provided between these two diaphragms. In principle, however, such embodiments are conceivable in which no such separator is provided between the panels.
  • the adjusting means may in particular also comprise means by means of which the volume flows of a turbulence generator associated with the headbox can be at least partially separated in the z-direction, the means preferably being designed so that the volume flow in the uppermost turbulence channel row and the Volumetric flow in the lowest turbulence channel line of the turbulence generator can be influenced separately.
  • a two-layer headbox is provided, on which the upper and lower jet speeds can be adjusted differently and / or separately in order to influence the transverse fiber orientation profiles, in particular of the upper or lower half of the sheet or side.
  • on-line measuring devices can be used to measure the fiber orientation at the top and to measure the fiber orientation at the bottom of the page in order to obtain two independent fiber orientation profiles.
  • this takes into account the fact that, in particular, the fiber orientations on the upper side and the lower side of the sheet are significant influencing factors, in particular for the curl.
  • the fiber orientation cross-sections are measured online in the machine, in particular at the top and bottom of the sheet.
  • these can then be influenced separately, which in particular a separate control or regulation of the fiber orientation of, for example, the top and bottom of the sheet is possible.
  • the fiber orientation difference profile or the fiber orientation differences between the top side and the bottom side can thus be minimized.
  • the fiber orientations in the sheet can be optimized independently, for example, at the top and bottom.
  • appropriate means may be provided at the headbox. These means include, for example, the so-called sectioned "EdgeModule" technology.
  • the valves for regulating the flow rates can be used, which are fed into the lateral edge regions of the headbox of the headbox and / or deducted from these. In the process, these volume flows are also regulated in a sectional manner, especially in the z-direction.
  • an upper panel and / or a lower panel can be used.
  • closed control loops for the fiber orientation on the upper side and / or the fiber orientation on the lower side are conceivable, and these control loops can operate independently of each other.
  • the regulation and / or control may include, for example, one or more of the following organs or means:
  • the upper half of the sheet and the lower half of the sheet are coupled and controlled with the aim of minimizing the difference between the upper and lower fiber orientation transverse profiles;
  • control and / or regulating circuits for controlling or regulating the fiber orientation transverse profile of the upper side of the sheet and the fiber orientation transverse profile of the lower side of the sheet are possible, with the following in particular being provided for control or regulation:
  • FIG. 1 is a schematic, partially sectioned plan view of an exemplary embodiment of a headbox with associated exemplary actuating means, which include a feed and / or withdrawal device for a sectioned in the z-direction edge-side feed or withdrawal of a respective predetermined volume flow;
  • FIG. 2 shows a schematic illustration of another exemplary embodiment of adjusting means, which has an upper adjustable aperture provided in the upper region of a headbox and one in the lower.
  • Area of the headbox provided lower adjustable aperture comprise, wherein the panels are each designed as a standard panel and between the panels a separating element is provided; 3 shows a schematic representation of another exemplary embodiment of adjusting means, which comprises an upper adjustable diaphragm provided in the upper region of a substance jet nozzle and one in the lower one
  • FIG. 4 shows an embodiment of adjusting means comparable to the embodiment according to FIG. 3, wherein, however, no separating element is provided between the shutters;
  • FIG. 5 is a schematic representation of an exemplary embodiment of an apparatus for on-line control and / or control of a fiber orientation cross-profile of a moving paper or board web in a headbox comprising a headbox nozzle
  • Paper machine with a measuring device for a separate online measurement of the fiber orientation transverse profile of the upper half of the sheet and the fiber orientation transverse profile of the lower half of the sheet and with adjusting means for the separate control or regulation of the Faserorientie- rungsquerprofile the upper and lower half of the sheet by means of a separate upper and lower half of the sheet edge feed.
  • FIG. 1 shows, in a schematic, partially sectioned plan view, an exemplary embodiment of a headbox 10 with associated exemplary adjusting means, which comprise a feed and / or withdrawal device 12 for a peripheral feed or removal of a respective predefinable volume flow in the z-direction in or out of the lateral edge regions 14, 16 of the headbox 18 include.
  • Such a headbox 10 can be used to provide a device according to the invention for the online control and / or regulation of a fiber orientation cross-section. profuse a running paper or board web are used in a paper machine.
  • the headbox 10 comprises a multiple distributor 22 adjoining a transverse distributor 20, a compensation chamber 24, a turbulence generator 26 and a headbox jet 18 producing the suspension free jet 28.
  • the feed and / or removal device 12 comprises lateral supply and / or discharge lines 30, in each of which a valve, in particular control valve 32 is arranged. In the present case, these lines 30 are connected to the cross-flow distributor 20.
  • Fig. 2 shows a schematic representation of another exemplary embodiment of adjusting means.
  • these comprise an upper adjustable orifice 34 provided in the upper region of a headbox nozzle 18 and a lower, adjustable orifice 36 provided in the lower region of the headbox nozzle 18.
  • the shutters 34, 36 are each designed as standard shutters. Between the apertures 34, 36, a separator 38 is provided. With these adjusting agents, it is again possible to optimize the cross-sectional fiber profile in the z-direction.
  • FIG. 3 shows a schematic representation of another exemplary embodiment of adjusting means.
  • these again comprise an upper adjustable orifice 34 provided in the upper region of a headbox nozzle 18 and a lower adjustable orifice 36 provided in the lower region of the headbox nozzle 18.
  • a separating element 38 is again provided between the two orifices 34, 36.
  • the diaphragms 34, 6 are each designed as a parallel diaphragm.
  • These adjusting means can also be provided again for the optimization of the transverse fiber distribution profile stratified in the z-direction.
  • FIG. 4 shows an embodiment of adjusting means comparable to the embodiment according to FIG. 3, with corresponding reference numerals being assigned to corresponding parts. In the present case, however, no separating element is provided between the diaphragms 34, 36. While in the present case the diaphragms 34, 36 are each designed, for example, as parallel diaphragms, they can, for example, also be designed as standard diaphragms, as in the case of the embodiment according to FIG. 2.
  • FIG. 5 shows a schematic representation of an exemplary embodiment of a device 40 for the online control and / or regulation of a fiber orientation transverse profile of a moving paper or board web 42 in a paper machine comprising a headbox 10 with a headbox nozzle 18 with a measuring device 44 for a separate online measurement of the fiber orientation transverse profile of the upper half of the sheet and the fiber orientation transverse profile of the lower half of the sheet and with adjusting means, in the present case, for example, comprise means 46, via which the flow rates of the headbox 10 associated turbulence generator 26 in the z-direction sectionally at least partially influenced separately are.
  • These means 46 are in the present case, for example designed so that the Faserorient istsquerprofile the upper and lower half of the sheet can be controlled or regulated by means of a separate for the upper and lower half of the blade edge feed.
  • the measuring device 44 is connected in the present case, for example, with a controller 48, via which the adjusting means 46 are acted upon accordingly.
  • a fiber heeting transverse profile control layered over the z-dimension or in the z-direction comprises a separate online measurement of the fiber orientation transverse profiles for the upper and the lower half of the sheet.
  • the position of the measurement in the machine direction can, for example, be provided before reeling or before the line application is online.
  • a separate control of the fiber orientation transverse profiles for the upper and lower half of the sheet is provided.

Landscapes

  • Paper (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne un dispositif pour la commande et/ou le régulation en ligne d'un profil transversal d'orientation des fibres dans une feuille continue de papier ou de carton en déplacement, dans une machine à papier comprenant une caisse de tête (10) pourvue d'une buse (18). Le dispositif selon l'invention est caractérisé en ce qu'il comporte un système de mesure (44) pour mesurer en ligne, par sections dans la direction z, le profil transversal d'orientation des fibres de la feuille continue de matière fibreuse, le système de mesure (44) étant conçu pour mesurer séparément, en ligne, le profil transversal d'orientation des fibres respectif d'au moins deux couches de la feuille continue, et comprenant un moyen de régulation (12, 34, 36, 46) permettant d'influencer, de préférence au moins en partie séparément, les profils transversaux d'orientation des fibres des différentes couches de la feuille continue de matière fibreuse.
EP09745746A 2008-05-16 2009-05-13 Dispositif de commande et/ou de régulation en ligne d'un profil transversal d'orientation des fibres Withdrawn EP2276886A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810001836 DE102008001836A1 (de) 2008-05-16 2008-05-16 Vorrichtung zur Online-Steuerung und/oder -Regelung eines Faserorientierungsquerprofils
PCT/EP2009/055746 WO2009138414A2 (fr) 2008-05-16 2009-05-13 Dispositif de commande et/ou de régulation en ligne d'un profil transversal d'orientation des fibres

Publications (1)

Publication Number Publication Date
EP2276886A2 true EP2276886A2 (fr) 2011-01-26

Family

ID=41180225

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09745746A Withdrawn EP2276886A2 (fr) 2008-05-16 2009-05-13 Dispositif de commande et/ou de régulation en ligne d'un profil transversal d'orientation des fibres

Country Status (4)

Country Link
EP (1) EP2276886A2 (fr)
CN (1) CN102066661A (fr)
DE (1) DE102008001836A1 (fr)
WO (1) WO2009138414A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI127892B (en) * 2016-10-05 2019-05-15 Teknologian Tutkimuskeskus Vtt Oy Method and apparatus for producing elongated fiber products
CN106835804B (zh) * 2017-02-09 2019-01-15 华南理工大学 一种改善湿纸页两边成型的装置及方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19634997C2 (de) 1996-08-30 1999-08-05 Voith Sulzer Papiermasch Gmbh Regeleinrichtung mit einer Sensoren-Mehrzahl
FI115645B (fi) * 1997-01-14 2005-06-15 Metso Paper Inc Paperikoneen perälaatikko, jossa on reunasyöttöjärjestelyt
US5833808A (en) 1997-01-21 1998-11-10 Beloit Technologies, Inc. Method of controlling curl employing inline headbox edge flow control valve
DE19733454A1 (de) 1997-08-02 1999-02-04 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zur Erkennung und Korretur einer Faserorientierungs-Querprofil-Veränderung
US6117272A (en) 1998-09-03 2000-09-12 Voith Sulzer Papiermaschinen Device and process for metering auxiliary materials into the flow box of a paper machine
FI113672B (fi) * 1999-04-28 2004-05-31 Metso Paper Inc Menetelmä ja laitteisto laimennusnesteen sekoittamiseksi massavirtaukseen paperikoneessa tai kartonkikoneessa
FI991096A (fi) 1999-05-12 2000-11-13 Valmet Corp Menetelmä paperin, erityisesti hienopaperin, valmistamiseksi ja paperi konelinja erityisesti hienopaperin valmistamista varten
DE102004035303A1 (de) 2004-07-21 2006-02-16 Voith Paper Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn
US7399380B2 (en) 2004-11-10 2008-07-15 Honeywell International Inc. Jet velocity vector profile measurement and control
DE102007021447A1 (de) * 2007-05-08 2008-11-13 Voith Patent Gmbh Verfahren zum Herstellen einer mehrschichtigen Faserstoffbahn und Mehrschichtenstoffauflauf

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009138414A3 *

Also Published As

Publication number Publication date
WO2009138414A3 (fr) 2010-01-07
WO2009138414A2 (fr) 2009-11-19
DE102008001836A1 (de) 2009-11-19
CN102066661A (zh) 2011-05-18

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