EP1033436B1 - Procédé et dispositif pour le dosage d'un milieu fluide dans l'écoulement d'une suspension dans une caisse de tête - Google Patents

Procédé et dispositif pour le dosage d'un milieu fluide dans l'écoulement d'une suspension dans une caisse de tête Download PDF

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Publication number
EP1033436B1
EP1033436B1 EP99118683A EP99118683A EP1033436B1 EP 1033436 B1 EP1033436 B1 EP 1033436B1 EP 99118683 A EP99118683 A EP 99118683A EP 99118683 A EP99118683 A EP 99118683A EP 1033436 B1 EP1033436 B1 EP 1033436B1
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EP
European Patent Office
Prior art keywords
channel
metering
headbox
fluid medium
channels
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.)
Revoked
Application number
EP99118683A
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German (de)
English (en)
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EP1033436A3 (fr
EP1033436A2 (fr
Inventor
Wolfgang Ruf
Hans Loser
Klaus Lehleiter
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
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Voith Paper Patent GmbH
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Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
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Publication of EP1033436A3 publication Critical patent/EP1033436A3/fr
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    • 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
    • D21F1/022—Means for injecting material into flow within the headbox
    • 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
    • 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
    • D21F1/026—Details of the turbulence 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
    • 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
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a method for metering a fluid medium into a stock suspension flow of a headbox, wherein the stock suspension flow distributed in the headbox over the machine width, directed into a plurality of turbulence-generating channels and transported to the headbox. Furthermore, in the region of the turbulence-generating channels, a total pressure loss .DELTA.P.sup.set is produced which consists of at least one inlet pressure loss .DELTA.P inlet on entering the channels and a step pressure loss .DELTA.P stage by at least one cross-sectional change within the channels. In addition, the metered addition of the fluid medium takes place in the region of at least one of the channels between the channel inlet and the channel outlet.
  • the invention also relates to a headbox of a paper or board machine with at least one machine-wide stock suspension feed, at least one turbulence generator with a plurality of suspension-flowed channels, a plurality of metering points for a fluid medium in the region of at least one of the channels and a subsequent headbox nozzle.
  • FIG. 6 shows in FIG. 6 a headbox with a machine-wide suspension feed, a turbulence generator with a plurality of flow-through channels, wherein the channels have a plurality of metering points for a fluid medium in a part of the channels, and a headbox nozzle adjoining the turbulence generator.
  • a method for metering a fluid medium into a stock suspension stream of a headbox is disclosed to the person skilled in the art in which the stock suspension stream is distributed over the machine width into a multiplicity of turbulence-producing channels and through this to the headbox nozzle.
  • a total pressure loss is generated which arises at least from the inlet pressure loss into the channels and the subsequent step pressure losses due to cross-sectional change within the channels.
  • the metered addition of the fluid medium takes place in a part of the channels, between channel inlet and channel outlet.
  • the object is achieved by the features of the first method claim and the features of the first device claim.
  • the inventors have recognized that the basically necessary pressure loss on a turbulence insert with turbulence ducts or turbulence pipes is mainly caused by the inlet pressure loss at the transition between the transverse distributor of the headbox to the turbulence insert by the previous designs of the headbox. Since only a slight pressure gradient arises in the downstream part of the turbulence insert, metering in this area has an intensive and undesirable effect on the overall throughput of the respective channel.
  • the solution to the above problem is therefore that the inlet pressure loss is significantly reduced by a corresponding design of the turbulence channel in the initial region compared to the resulting pressure loss in the further course of the channel.
  • the inventor proposes to improve the method of metering a fluid medium into a headbox stock suspension stream wherein the stock suspension stream in the head box is spread across the machine width into a plurality of turbulence generating channels conveying the stock suspension to the headbox nozzle, being in the turbulence generating area Channels, a total pressure loss .DELTA.P ges is generated, which results from at least one inlet pressure loss .DELTA.P inlet upon entering the channels and a step pressure loss .DELTA.P stage by at least one of the cross-sectional change within the channels, and wherein the metered addition of the fluid medium in the region of at least one of the channels between channel and channel exit occurs.
  • the improvement according to the invention consists in that at least 50% of the total pressure loss ⁇ P ges is generated downstream of the metered addition of the fluid medium.
  • the proportion of the pressure loss which is generated downstream of the metered addition of the fluid medium should amount to a maximum of 75% of the total pressure loss ⁇ P tot .
  • a particularly preferred embodiment provides that 50% - 60% of the total pressure loss .DELTA.P ges is generated downstream of the metered addition of the fluid medium.
  • the headbox ensures that the metered addition of fluids, for example of dilution water in the turbulence insert a headbox only minimal changes in terms of the local total throughput of the turbulence insert cause and on the other hand, a clearly defined effective width of the addition is given in the Range of normal control variables is almost independent of the amount of the metered fluid.
  • inlet pressure loss .DELTA.P inlet is kept low by the use of a venturi section in the channel, since in this case no separation areas to the inflow arise.
  • a corrugated contour in the respective channel is used to generate the pressure loss behind the metered addition of the fluid medium. Due to the large number of waves in the corrugated contour, a high pressure loss with a desired turbulence structure-that is, turbulence with small wavelengths-can be generated in the narrowest of spaces.
  • Another advantageous embodiment of the method provides that the metered addition of the fluid medium takes place in at least one channel opposite to the main flow direction of the stock suspension. As a result, optimal mixing of the injected fluid with the main flow of the stock suspension is achieved.
  • the metered addition of the fluid medium takes place in all channels of the turbulence generator or at least evenly distributed over the entire web width.
  • the basis weight cross profile and also the basis weight profile in the z direction are referred to the applications DE 44 22 907 and DE 196 32 673 A1.
  • the concept of the invention is also realized by the further development of a headbox of a paper or board machine with at least one machine-wide stock suspension feed, at least one turbulence generator with a plurality of suspension-flowed channels, a plurality of metering points for a fluid medium in the region of at least one of the channels and a subsequent headbox nozzle, in that at least one of the channels of the turbulence generator is designed in such a way that the proportion of the flow resistance downstream of the metering point amounts to at least 50% of the total resistance of the channel.
  • the proportion of the flow resistance after the Zudosierstelle should not exceed 75% of the total resistance of the channel, with a division of the resistances before and after Zudosierstelle is preferred in which 50% to 60% of the total resistance downstream of the Zudosierstelle are arranged.
  • a further embodiment of the headbox according to the invention provides that at least one channel with a Zudosierstelle at the inlet region has a chamfer.
  • the chamfer has a depth t in the range of 2 mm to 10 mm, preferably in the range of 4 mm to 6 mm, with a chamfer angle ⁇ between 20 ° and 80 °.
  • a headbox according to the invention in which the outflow opening of the metering point is directed counter to the main flow direction of the stock suspension in the channel.
  • 1 shows a schematic representation of the cross section of a headbox in the region of a turbulence channel.
  • the turbulence channel 1 connects the machine-wide pulp suspension distribution (left side) with the headbox nozzle (right side).
  • the turbulence channel on the inlet side of the stock suspension has a strong chamfer 4, which is intended to reduce the inlet pressure loss at this point.
  • This is followed by a cylindrical part of the channel 1, into which a metering opening 3 opens.
  • the metering opening 3 is fed via a supply channel 2 for the fluid medium.
  • the main flow direction of the stock suspension stream is indicated by the arrow 10.
  • the flow direction 11 of the metered-in fluid runs in the initial region substantially perpendicular to the main flow direction 10.
  • FIG. 2 also shows a detail of the turbulence generator of a headbox with the substance-suspension-carrying channel 1 and a metering opening 3 for a fluid medium in the channel 1.
  • the channel is equipped with a pressure-reducing chamfer 4, followed by a straight course of the channel 1 into which the metering opening 3 opens.
  • the straight course of the channel 1 merges into a corrugated contour, through which the main pressure loss within the channel 1 arises.
  • a first increment 8 which follows a substantially undisturbed, cylindrical course of the channel 1.
  • FIG. 3 shows a variant of a channel 1, in which the metering opening 3 for the fluid medium opens into the channel 1 in the course of the strongest constriction 6. Subsequent to this narrowest region of the channel 1, a diffuser-like, conical extension 7 of the channel 1 follows to a corrugated contour 12, which merges without paragraph in a smooth cylindrical portion of the channel 1.
  • FIG. 4 shows a further variant of the channel 1 of a headbox designed according to the invention.
  • the entrance area is provided with a Venturikontur 13 for resistance reduction, which has a parabolic-like course and merges into a smooth cylindrical section whose cross-section is larger than the input cross-section into the venturi opening.
  • a conical constriction 5 which merges into a narrowest cylindrical region 6, followed by a conical enlargement 7, which in turn is followed by a smooth-cylindrical region 16 with a relatively large cross-section.
  • the main resistance or main pressure loss is moved behind the Zudosierstelle for the fluid medium.
  • FIG. 5 shows a further variant of the embodiment of the metering point in the channel 1 according to the invention of the turbulence generator of a headbox.
  • a relatively narrow, cylindrical region 6 is again narrowed by an annular gap 14, which communicates with the metering port 3 for the metered addition of a fluid medium.
  • the channel-side opening of the annular gap 14 is directed counter to the main flow direction 10 of the substance suspension passed through the channel 1.
  • the annular gap 14 itself forms the narrowest point in the entire channel 1, so that here too, the largest part of the flow resistance and thus the pressure loss is located behind the Zudosierstelle for the fluid medium.

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Claims (18)

  1. Procédé de dosage d'un milieu fluide dans un courant de suspension de matière d'une caisse de tête ayant les caractéristiques suivantes :
    le courant de suspension de matière est réparti dans la caisse de tête sur toute la largeur de la machine, est guidé dans une pluralité de canaux (1) produisant des turbulences et est acheminé à la buse de la caisse de tête,
    une perte de pression totale ΔPgaz étant occasionnée dans la région des canaux (1) produisant des turbulences, laquelle est constituée d'au moins une perte de pression d'entrée ΔPentrée à l'entrée dans les canaux et d'une perte de pression de gradin ΔPgradin par au moins une modification de la section transversale (5, 7, 8, 9) à l'intérieur des canaux, et
    le dosage du milieu fluide ayant lieu dans la région d'au moins l'un des canaux (1) entre l'entrée du canal et la sortie du canal,
    caractérisé en ce que
    au moins 50% de la perte de pression totale ΔPgaz est produite en aval du dosage du milieu fluide.
  2. Procédé selon la revendication précédente, caractérisé en ce qu'au maximum 75% de la perte de pression totale ΔPgaz est produite en aval du dosage du milieu fluide.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que de 50% à 60% de la perte de pression totale ΔPgaz est produite en aval du dosage du milieu fluide.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une perte de pression totale ΔPgaz de 0,3 x 105 Pa à 8 x 105 Pa, de préférence de 4 x 105 Pa à 8 x 105 Pa est produite.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la perte de pression d'entrée ΔPentrée est maintenue faible par l'utilisation d'une section transversale de type venturi (13) dans le canal.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que pour produire la perte de pression derrière le dosage du milieu fluide, on utilise un contour ondulé (12).
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le dosage du milieu fluide s'effectue dans au moins un canal (1) à l'encontre du sens d'écoulement principal (10) de la suspension de matière.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le dosage du milieu fluide s'effectue dans tous les canaux (1) ou au moins de façon répartie uniformément sur toute la largeur de la bande.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que grâce au dosage du milieu fluide, on ajuste le profil transversal de grammage et/ou le profil transversal d'orientation des fibres de la bande produite.
  10. Caisse de tête d'une machine à papier ou à carton, comprenant :
    au moins un apport de suspension de matière de la largeur de la machine,
    au moins un générateur de turbulences avec une pluralité de canaux parcourus par la suspension,
    une pluralité de points de dosage pour un milieu fluide dans la région d'au moins l'un des canaux (1) et d'une buse de caisse de tête s'y raccordant,
    caractérisée en ce que
    la proportion de résistance à l'écoulement d'au moins l'un des canaux avec un point de dosage vaut au moins 50% de la résistance totale du canal après le point de dosage.
  11. Caisse de tête selon la revendication précédente 10, caractérisée en ce que la proportion de la résistance d'écoulement de l'au moins un canal (1) avec un point de dosage vaut au maximum 75% de la résistance totale du canal (1) après le point de dosage.
  12. Caisse de tête selon l'une quelconque des revendications précédentes 10 à 11, caractérisée en ce que la proportion de la résistance d'écoulement de l'au moins un canal (1) avec un point de dosage vaut de 50% à 60% de la résistance totale du canal après le point de dosage.
  13. Caisse de tête selon l'une quelconque des revendications précédentes 10 à 12, caractérisée en ce que l'au moins un canal avec un point de dosage présente au niveau de la région d'entrée au moins un biseau qui présente une profondeur t dans la plage de 2 mm à 10 mm, de préférence dans la plage de 4 mm à 6 mm, avec un angle de biseau α compris entre 20° et 80°.
  14. Caisse de tête selon l'une quelconque des revendications précédentes 10 à 13, caractérisée en ce que l'au moins un canal avec un point de dosage présente au niveau de la région d'entrée le contour (13) d'une buse venturi.
  15. Caisse de tête selon l'une quelconque des revendications précédentes 10 à 14, caractérisée en ce que l'au moins un canal avec un point de dosage présente en aval du point de dosage un contour ondulé (12).
  16. Caisse de tête selon l'une quelconque des revendications précédentes 10 à 15, caractérisée en ce que l'ouverture de sortie (3) du point de dosage est orientée à l'encontre du sens d'écoulement principal de la suspension de matière dans le canal.
  17. Caisse de tête selon l'une quelconque des revendications précédentes 10 à 16, caractérisée en ce que tous les canaux présentent un point de dosage.
  18. Caisse de tête selon l'une quelconque des revendications précédentes 10 à 17, caractérisée en ce que les points de dosage sont répartis uniformément sur toute la largeur de la machine.
EP99118683A 1999-03-02 1999-09-22 Procédé et dispositif pour le dosage d'un milieu fluide dans l'écoulement d'une suspension dans une caisse de tête Revoked EP1033436B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19908898A DE19908898A1 (de) 1999-03-02 1999-03-02 Verfahren zur Zudosierung eines fluiden Mediums in einen Suspensionsstrom eines Stoffauflaufes und Stoffauflauf
DE19908898 1999-03-02

Publications (3)

Publication Number Publication Date
EP1033436A2 EP1033436A2 (fr) 2000-09-06
EP1033436A3 EP1033436A3 (fr) 2001-03-21
EP1033436B1 true EP1033436B1 (fr) 2006-01-11

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EP99118683A Revoked EP1033436B1 (fr) 1999-03-02 1999-09-22 Procédé et dispositif pour le dosage d'un milieu fluide dans l'écoulement d'une suspension dans une caisse de tête

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US (2) US6464837B1 (fr)
EP (1) EP1033436B1 (fr)
AT (1) ATE315681T1 (fr)
DE (2) DE19908898A1 (fr)

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GB2367564B (en) * 2000-10-04 2004-02-18 Sandusky Walmsley Ltd Method of and apparatus for distribution of paper stock in paper or board making machinery
DE10208610B4 (de) * 2002-02-27 2014-03-06 Voith Patent Gmbh Verfahren zum Verteilen einer Faserstoffsuspension im Stoffauflauf einer Papier- oder Kartonmaschine und Stoffauflauf
DE102004055919A1 (de) * 2004-11-19 2006-05-24 Voith Paper Patent Gmbh Stoffauflauf
US20060173313A1 (en) * 2005-01-27 2006-08-03 Siemens Medical Solutions Usa, Inc. Coherence factor adaptive ultrasound imaging
CN101647270A (zh) 2007-04-11 2010-02-10 汤姆森许可贸易公司 用于增强数字视频效果（dve）的方法和装置
WO2011088888A2 (fr) 2010-01-19 2011-07-28 Metso Paper, Inc. Caisse de tête basse consommation
DE102010030352A1 (de) * 2010-06-22 2011-12-22 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
US8871059B2 (en) * 2012-02-16 2014-10-28 International Paper Company Methods and apparatus for forming fluff pulp sheets
DE102012013286B4 (de) 2012-07-05 2016-06-30 Rail.One Gmbh Vorrichtung zur Befestigung einer Schiene auf einem Träger

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DE3514554C3 (de) * 1984-09-19 1998-01-08 Escher Wyss Gmbh Stoffauflauf-Vorrichtung für eine Papiermaschine und Verfahren zu deren Betrieb
DE4211291C3 (de) * 1992-04-03 2001-06-07 Voith Gmbh J M Mischeinrichtung und Verfahren zum Mischen von zwei Flüssigkeiten bei konstantem Gemischvolumenstrom zur Versorgung des Stoffauflaufs einer Papiermaschine
ATE335100T1 (de) * 1993-07-01 2006-08-15 Metso Paper Inc Verfahren und vorrichtung zur regelung eines stoffauflaufkastens
DE4323263C2 (de) * 1993-07-12 2001-11-29 Voith Paper Patent Gmbh Verfahren zur sektionalen Beeinflussung der Stoffdichte und der Faserorientierung in einem Stoffauflauf einer Papiermaschine und Stoffauflauf zur Durchführung des Verfahrens
DE4422907C2 (de) 1994-06-30 1997-03-06 Voith Gmbh J M Sektionale Stoffzuführung des Stoffauflaufs einer Papiermaschine
US5626722A (en) * 1995-06-01 1997-05-06 Valmet Corporation Headbox of a paper/board machine
DE19632673A1 (de) * 1996-08-14 1998-02-19 Voith Sulzer Papiermasch Gmbh Stoffauflauf und Verfahren zur Verteilung einer Faserstoffsuspension im Stoffauflauf einer Papiermaschine
DE19634993A1 (de) * 1996-08-30 1998-03-05 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zum Einstellen des Stoffdichte- und Faserorientierungsprofils in einem Stoffauflauf
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
FI116470B (fi) * 1999-10-04 2005-11-30 Metso Paper Inc Menetelmä paperirainan muodostamiseksi

Also Published As

Publication number Publication date
US6890408B2 (en) 2005-05-10
EP1033436A3 (fr) 2001-03-21
DE59913039D1 (de) 2006-04-06
US6464837B1 (en) 2002-10-15
ATE315681T1 (de) 2006-02-15
US20030000674A1 (en) 2003-01-02
DE19908898A1 (de) 2000-09-07
EP1033436A2 (fr) 2000-09-06

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