EP2531647B1 - Caisse de tête et unité de formation de feuille comprenant une caisse de tête - Google Patents

Caisse de tête et unité de formation de feuille comprenant une caisse de tête Download PDF

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Publication number
EP2531647B1
EP2531647B1 EP11702210.3A EP11702210A EP2531647B1 EP 2531647 B1 EP2531647 B1 EP 2531647B1 EP 11702210 A EP11702210 A EP 11702210A EP 2531647 B1 EP2531647 B1 EP 2531647B1
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Prior art keywords
nozzle
unit
headbox
hydr
turbulence
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Not-in-force
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EP11702210.3A
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German (de)
English (en)
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EP2531647A1 (fr
Inventor
Hans Loser
Markus Haeussler
Wolfgang Ruf
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Voith Patent GmbH
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Voith Patent GmbH
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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
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section

Definitions

  • the invention relates to a headbox with at least one feeding device feeding at least one pulp suspension, a nozzle having an outlet slit for dispensing the pulp suspension in a free jet to a downstream functional unit of a forming unit arranged downstream of the headbox and a turbulence generating means directly upstream of the nozzle having a multiplicity of at least a fluidization region having turbulence generating channels for guiding the pulp suspension in sub-streams and the nozzle, wherein the individual channels are arranged in the transverse direction of the turbulence generating device parallel to each other to form rows and the rows are arranged side by side or one above the other perpendicular to the transverse direction.
  • the invention further relates to a sheet forming unit for machines for producing fibrous webs, in particular paper, board or tissue webs, comprising a headbox and a forming unit downstream therefrom.
  • the consistency of a pulp suspension decisively determines the quality of a fibrous web present as a result of the production process. It can be observed when using fibrous suspensions with higher consistency a deteriorating, writable by the macroscopic and microscopic distribution of fibers and fillers formation.
  • fibrous suspensions with fabric densities in the range of 0.8 to 1.0 percent are currently introduced with the known headboxes in a downstream forming unit. Higher fabric densities already result at the exit of the jet the headbox due to the strong fiber flocculation to a coarsely cloudy formation. Therefore, it is necessary to take measures to destroy these unwanted flocs and to fix the flow in time.
  • the aim is to provide over the entire width of the headbox floc-free as possible pulp suspension jet at the exit slit of the headbox.
  • a variety of means, in particular turbulence generating and hydraulic units are used, which usually have a plurality of channels for better fluidization.
  • These can be designed in various ways and are characterized in the simplest case by step-like cross-sectional changes of the flow cross-section.
  • the adjoining nozzles generally have a length between 600 to 700 mm in order to obtain a sufficient jet stability. The resulting from the lattice wake flow can be sufficiently attenuated within the nozzle over this length.
  • stepwise changes in the cross-sectional areas and lengths of the individual subregions of the flow channels of the turbulence generation device forming the fluidization region are proposed, which have an overall length of the turbulence generating device in a prescribed range.
  • the publication DE 101 06 684 A1 discloses an embodiment of a headbox having a fin end specifically designed to prevent flow instabilities within the nozzle and thus vibratory excitation, which has a slope on the side facing the nozzle wall and is patterned on the side away therefrom.
  • the publication WO 2008/077585 A1 discloses the promotion of the formation of symmetrical properties in the Z direction via symmetrically formed headbox nozzles and the design and dimensioning of these.
  • the publication DE 102 34 559 A1 discloses an embodiment of a headbox in a sheet forming system in which the nozzle is characterized by a length greater than 400 mm, wherein the length of the upstream vortex generating means preferably also lies in this range.
  • the known measures are not sufficient to prevent the reflow at higher densities of the pulp suspension, for example, of more than 1.0 percent, in particular of more than 1.2 percent, to the desired extent or reduce.
  • the invention is therefore based on the object, a headbox of the type mentioned for use in machines for the production of fibrous webs, especially paper, cardboard or tissue webs, further develop such that the disadvantages mentioned are avoided and the reflocculation of the pulp suspension after the last Fluidizing area is reduced or prevented.
  • a reduction in the residence time of the pulp suspension in the headbox while maintaining the same beam quality should be considered.
  • a fluidization region is understood to mean a region in which there is a homogeneous distribution of the constituents containing the pulp suspension, such as, for example, fibers and fillers.
  • the action can be carried out actively by controllable elements with respect to their effect, such as static mixing devices or passively by the geometric design of the flow path and the consequent generation of turbulence on the pulp suspension with dissolution of accumulations, in particular flakes.
  • the region can be locally limited on a line in the cross-machine direction or can be designed to extend in the direction of flow in the direction of flow.
  • a hydraulic unit is understood to mean a unit for generating one or more lattice streams or partial lattice streams over at least a partial area of the outlet width with a predefined extent in the cross-machine direction, that is to say the width direction of the turbulence-generating device.
  • the single hydraulic unit acts on the nozzle.
  • the decisive for the description of the cross section of the lattice tracking flow in the nozzle surface is determined by the dimensions of the hydraulic unit, in particular their extent transverse to the flow direction and thus in the cross-machine direction and the height perpendicular to the flow direction. This area corresponds the portion of the hydraulic unit associated with the cross-sectional area at the inlet to the nozzle, that is, the nozzle beginning.
  • the solution according to the invention specifically uses the relationship between the cross section of the lattice wake flow of a hydraulic unit in the nozzle and the length of the nozzle and defines the overall nozzle volume as a criterion for a short residence time while maintaining the specifications according to the invention.
  • the length of the nozzle is characterized by the distance between the exit from the upstream turbulence generating device and the exit slit of the nozzle and is measured perpendicular to the exit surface from the turbulence generating device.
  • the length of the nozzle results in dependence of the desired shape of the nozzle volume. The length can thus be varied at given volume on the shape.
  • a headbox designed in accordance with the invention is preferably used in a sheet forming unit for machines for producing fibrous webs, in particular paper, board or tissue webs, further comprising a subsequent forming unit in which the pulp suspension from the exit slit of the headbox onto a clothing under definition of a line of impact in a free jet or is introduced, get used.
  • the execution of the headbox according to the invention takes place in such a way that the residence time of the pulp suspension in the nozzle and in the turbulence generating device is kept as low as possible.
  • the forming unit may be embodied as a hybrid former, gap former, comprising two screen belts or a wire screen forming an inlet gap for the pulp suspension, comprising a screen belt, on the surface of which the pulp suspension is applied by means of the head box.
  • FIG. 1 illustrates on the basis of a diagram the influence of the consistency SD of a pulp suspension FS on the formation.
  • the diagram illustrates in detail the formation of the flake structure FL in the free jet resulting from the exit of the pulp suspension FS from a nozzle of a headbox with respect to the dimension of the flakes FL forming as a function of the pulp density SD.
  • This shows the relationship between high consistency SD and an uneven and coarsely cloudy formation with regard to the arrangement of the fibers and fillers due to increased flocculation (arrow FL +), ie the tendency for larger flocs FL to emerge in the free jet of fibrous suspension FS exiting from the exit slit of a headbox in conventional known headboxes.
  • FIG. 1 illustrates only the basic relationship between the consistency of a pulp suspension FS and the flock slope. This is also dependent on the selected pulp itself.
  • FIG. 2 illustrates in schematic highly simplified representation of a section of an inventively designed headbox 1 for use in machines for producing webs, especially machines for producing fibrous webs in the form of paper, board or tissue webs with inventive length L D of the nozzle 4 to reduce the Refluxing, that is to say re-flocculation within the fibrous suspension FS before or at the exit from the headbox 1.
  • the headbox 1 is arranged upstream of a forming unit 2, which is here only indicated by means of a covering, and forms with it a sheet forming unit 3.
  • the function of the headbox 1 consists of spreading at least one pulp suspension at the machine width FS in the forming unit 2, which is done via at least one nozzle 4.
  • the X-direction describes the longitudinal direction of the machine and is also referred to as machine direction MD. This coincides with the passage direction of the fibrous web.
  • the Y-direction describes the direction transverse to the direction of passage of the fibrous web F, in particular the width direction of the machine, and is therefore also referred to as the cross-machine direction CD, while the Z-direction corresponds to the height direction.
  • the flow direction coincides in the headbox 1 with the machine direction MD.
  • other arrangements are also conceivable, in particular with an inclination relative to the machine direction MD.
  • the headbox 1 comprises a feed device 5, via which the at least one pulp suspension FS can be distributed over the entire width of the headbox 1.
  • this comprises in the cross-machine direction CD extending, a distribution channel forming element, in particular a distributor tube, which is formed tapering in the machine direction CD in the flow direction.
  • the pulp suspension FS passes via at least one turbulence generating device 6 to the nozzle 4.
  • only one turbulence-generating device 6 is shown, which is directly upstream of the nozzle 4.
  • embodiments of headboxes 1 with a plurality of turbulence-generating devices, which are arranged one after the other are also conceivable be passed through mixers and / or mixing chambers.
  • the nozzle 4 connects to form a nozzle chamber 8, which is suitable to substantially accelerate the flow of the pulp suspension FS in operation and the pulp suspension FS through an exit slit 11 to the forming unit 2 for producing a material web leave.
  • the exit slit 11 is limited here by way of example by a diaphragm and the nozzle walls 10.1, 10.2.
  • the fibrous suspension FS is divided according to a predefined division and distributed in sub-streams out.
  • the turbulence-generating device 6 comprises a multiplicity of turbulence-generating channels 7, x extending in the throughflow direction and with at least one direction component in the machine direction MD, which are either machine-width-shaped or parallel to each other in the cross-machine direction CD in rows Rx where x ⁇ 1 and in the vertical direction is perpendicular to a writable by the flow direction and the CD transverse direction CD level in columns SPy with y ⁇ 1 are arranged parallel to each other.
  • the first index after the reference number describes the arrangement of the single channel in the respective row Rx, while the second index represents the arrangement in the respective column SPy perpendicular to the cross-machine direction CD.
  • channel does not describe a specific, firmly defined structural design and is functionally to be understood as a flow passage. This can be formed by individual components or in a solid body integrated or incorporated through holes. Recognizable here are the individual turbulence-generating channels 7.11 to 7.31 of the first column SP1.
  • the turbulence generating device 6 forms a flow grid and can be designed differently.
  • this comprises a perforated plate which describes the turbulence-generating channels 7.xy and has passage openings and / or a tube bundle forming the individual turbulence-generating channels 7.xy.
  • the single turbulence generating channel 7.xy is a flow channel to which turbulence generating means are associated or integrated.
  • This region is also referred to as fluidization region 12, wherein within a turbulence-generating channel 7.xy at least one such fluidization region 12, in which a pressure change is generated in the guided in this individual partial flow of the pulp suspension FS, is provided.
  • the smallest hydraulic unit E H is understood to mean one or a plurality of turbulence-generating channels arranged in a row, preferably arranged over a predefined region of the outlet width AB of 1 m.
  • FIGS. 3a and 3b The determination and representation of these quantities is in the FIGS. 3a and 3b by way of example with reference to a section of a headbox 1 according to FIG. 2 played.
  • the nozzle start height D A is calculated from the sum of the individual heights of the hydraulic units h D , wherein in a headbox with lamellae, the heights of the individual lamella holders must be added.
  • FIG. 3b shows by way of example in a view AA according to FIG. 3a a view of the outlet 6A from the turbulence generating device 6 extending in the cross machine direction CD, for example in four rows R1 to R4 and the columns SPy, here SP1 to SPn arranged individual turbulence generating channels 7.11 to 7.4n, wherein the individual turbulence generating channels 7.11 to 7.1 n, 7.21 to 7.2n, 7.31 to 7.3n and 7.41 to 7.4n within a single row R1 to R4 are each preferably arranged parallel to each other in the cross-machine direction CD with preferably the same pitch and the arrangement of the rows R1 to R4 perpendicular to the cross-machine direction CD and to Flow direction also preferably takes place parallel to each other.
  • FIGS. 4a to 4c illustrate possible embodiments of the individual nozzles 4, in particular of these parallel to the flow direction limiting nozzle walls 10.1, 10.2.
  • the length L D of the nozzles 4 in the flow direction is different, and this between the individual versions in the FIGS. 4a to 4c varied.
  • the respective lengths are denoted by L D1 , L D2 and L D3 , the corresponding volumes of the nozzles 4 with V D1 , V D2 and V D3 . Is recognizable in FIG. 4a a nozzle 4 with an inclined nozzle wall 10.2, which is running on the nozzle wall 10.1 tapered.
  • the nozzle cross section changes in the flow direction continuously changes by changing the inclination of only one nozzle wall 10.2.
  • Figure 4c an embodiment with also constant change of the nozzle cross-section in the flow direction, which is realized by the converging execution of the individual nozzle walls 10.1 and 10.2.
  • the FIG. 4b illustrates an embodiment with a sudden change in the nozzle cross-section by sudden change in the course of the nozzle wall 10.1.
  • the individual nozzle walls 10.1, 10.2 flat or curved or form a combination of the two.
  • FIGS. 4a to 4c Illustrated embodiments are exemplary. However, any other nozzle geometry is also conceivable. The decisive factor is that these conditions also apply to all headboxes with lamellas and / or dilution water technology.
  • the nozzle volumes V D1 , V D2 and V D3 of all nozzles are the same.
  • the nozzles 4 of FIGS. 4a to 4c differ only in their lengths, that is L D1 ⁇ L D2 L D3 .
  • Such a designed headbox 1 can be further modified in any manner.
  • These can be headboxes which are equipped with lamellae and / or are characterized with the dilution water technology, that is to say at least one metering device for metering in at least one further fluid into the pulp suspension.
  • the headbox 1 according to the invention can also be used in combination with arbitrarily designed forming units 2, in particular wire, hybrid former and twin-wire former.

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Claims (5)

  1. Caisse de tête (1) comprenant au moins un dispositif d'alimentation (5) alimentant au moins une suspension de matière fibreuse (FS), une buse (4) présentant une fente de sortie (11) pour délivrer la suspension de matière fibreuse (FS) sous forme de jet libre à une unité fonctionnelle, disposée en aval, d'une unité de formage (2) disposée en aval de la caisse de tête (1), et un dispositif générateur de turbulence (6) placé directement avant la buse (4) dans le sens de l'écoulement, comprenant une pluralité de canaux (7, 7.xy, 7.11-7.4n) générateurs de turbulence présentant au moins une région de fluidisation pour guider la suspension de matière fibreuse (FS) sous forme de flux partiels et pour solliciter la buse (4), les canaux individuels (7, 7.xy, 7.11-7.4n) étant disposés dans la direction transversale du dispositif générateur de turbulence (6) parallèlement les uns aux autres en formant des rangées (R1-Rx, R1-R4) et les rangées (R1-Rx, R1-R4) étant disposées les unes à côté des autres ou les unes au-dessus des autres perpendiculairement à la direction transversale, caractérisée en ce que
    la partie d'une rangée (R1-Rx, R1-R4) de canaux générateurs de turbulence (7, 7.xy, 7.11-7.4n) sollicitant la buse (4) sur une unité de longueur prédéfinie, transversalement à la direction de passage de l'écoulement, forme une unité hydraulique (EH) et en ce que la buse (4) et le dispositif générateur de turbulence (6) sont réalisés de telle sorte que le volume désigné par volume (Vhydr.Einheit) de l'unité hydraulique (EH) et pouvant être sollicité par une unité hydraulique individuelle (EH) soit ≤ 0,005 m3/m au niveau de la largeur de sortie.
  2. Caisse de tête (1) selon la revendication 1, caractérisée en ce que
    le volume (Vhydr.Einheit) de la buse (4) pouvant être sollicité par une unité hydraulique individuelle en fonction de la hauteur (hD) de l'unité hydraulique individuelle (EH) et de la longueur (LD) de la buse (4) vaut V hydr . Einheit = h D • L D 2 * m au niveau de la largeur de sortie ≤ 0 , 005 ⁢ m 3
    Figure imgb0009
    où
    Vhydr.Einheit est le volume de l'unité hydraulique (EH) ;
    hD est la hauteur de l'unité hydraulique (EH) ; et
    LD est la longueur de la buse (4) par mètre au niveau de la largeur de sortie.
  3. Caisse de tête (1) selon la revendication 1 ou 2, caractérisée en ce que
    le volume total (VD) de la buse (4) par unité de longueur prédéfinie vaut V D = n • V hydr . Einheit
    Figure imgb0010
    où
    n est le nombre des unités hydrauliques (EH) ; et Vhydr.Einheit est le volume d'une unité hydraulique (EH).
  4. Unité de formation de feuilles (3) pour des machines de fabrication de bandes de matière fibreuse, en particulier de bandes de papier, de carton ou de papier tissu, comprenant une caisse de tête (1) selon l'une quelconque des revendications 1 à 3, et une unité de formage (2) montée en aval de celle-ci, dans laquelle la suspension de matière fibreuse (FS) est appliquée ou introduite sous forme de jet libre à partir de la fente de sortie (11) de la caisse de tête (1).
  5. Unité de formation de feuilles (3) selon la revendication 4,
    caractérisée en ce que
    l'unité de formage (2) est réalisée sous forme de l'une des unités suivantes :
    - un formeur hybride ;
    - un formeur à fente, comprenant deux toiles formant une fente d'entrée pour la suspension de matière fibreuse (FS), en particulier des tamis à bande ;
    - un formeur à toile longitudinale, comprenant un tamis à bande, à la surface duquel est appliquée la suspension de matière fibreuse (FS) au moyen de la caisse de tête (1).
EP11702210.3A 2010-02-05 2011-02-04 Caisse de tête et unité de formation de feuille comprenant une caisse de tête Not-in-force EP2531647B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010001610A DE102010001610A1 (de) 2010-02-05 2010-02-05 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
PCT/EP2011/051627 WO2011095577A1 (fr) 2010-02-05 2011-02-04 Caisse de tête et unité de formation de feuille comprenant une caisse de tête

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EP2531647A1 EP2531647A1 (fr) 2012-12-12
EP2531647B1 true EP2531647B1 (fr) 2014-09-03

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EP (1) EP2531647B1 (fr)
CN (1) CN102770597B (fr)
DE (1) DE102010001610A1 (fr)
WO (1) WO2011095577A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015209389A1 (de) * 2015-05-22 2016-11-24 Voith Patent Gmbh Verfahren und Vorrichtung zur Herstellung von hochgefüllten Papieren
DE102016114040A1 (de) * 2016-07-29 2018-02-01 Voith Patent Gmbh Strömungsmodul und Verfahren zur Herstellung eines Strömungsmoduls für einen Stoffauflauf einer Papiermaschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29713433U1 (de) 1997-07-29 1997-09-11 Voith Sulzer Papiermasch Gmbh Stoffauflauf
DE19902621A1 (de) 1999-01-23 2000-07-27 Voith Sulzer Papiertech Patent Stoffauflauf
DE19902623A1 (de) 1999-01-23 2000-07-27 Voith Sulzer Papiertech Patent Stoffauflauf
FI117292B (fi) 2000-06-13 2006-08-31 Metso Paper Inc Paperikoneen tai vastaavan perälaatikko
DE10106684A1 (de) * 2001-02-14 2002-08-29 Voith Paper Patent Gmbh Lamelle eines Stoffauflaufs einer Papier-, Karton- oder Tissuemaschine
DE10234550B4 (de) 2002-07-30 2004-08-05 Schneller, Bernhard, Dr. Vorrichtung zur axialen Erweiterung einer Bohrung in einer Knochensubstanz
DE10234559A1 (de) * 2002-07-30 2004-02-19 Voith Paper Patent Gmbh Blattbildungssystem
EP2106478A1 (fr) 2006-12-22 2009-10-07 Voith Patent GmbH Arrivée de pâte d'une machine destinée à fabriquer une bande de matière fibreuse

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WO2011095577A1 (fr) 2011-08-11
CN102770597B (zh) 2015-06-10
DE102010001610A1 (de) 2011-08-11
EP2531647A1 (fr) 2012-12-12
CN102770597A (zh) 2012-11-07

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