EP2531649B1 - Caisse de tete et unite de formation de feuille comprenant une caisse de tete - Google Patents

Caisse de tete et unite de formation de feuille comprenant une caisse de tete Download PDF

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Publication number
EP2531649B1
EP2531649B1 EP11702220.2A EP11702220A EP2531649B1 EP 2531649 B1 EP2531649 B1 EP 2531649B1 EP 11702220 A EP11702220 A EP 11702220A EP 2531649 B1 EP2531649 B1 EP 2531649B1
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Prior art keywords
nozzle
turbulence
headbox
cross
individual
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EP11702220.2A
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German (de)
English (en)
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EP2531649A1 (fr
Inventor
Hans Loser
Markus Häußler
Wolfgang Ruf
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP2531649A1 publication Critical patent/EP2531649A1/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
    • 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 for use in a machine for producing fibrous webs, in particular paper, board or tissue webs of at least one pulp suspension, with at least one feeding device feeding at least one pulp suspension, a nozzle having an outlet gap for dispensing the pulp suspension a free jet and a turbulence generating device immediately upstream in the flow direction of the nozzle, in which the at least one pulp suspension can be guided through a plurality of turbulence-generating channels in partial flows, wherein at least one region forming a fluidization region is provided within the individual turbulence-generating channel.
  • 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 lead to a coarsely cloudy formation as soon as the jet emerges from the headbox due to the strong fiber flocculation. 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 portions of the flow channels of the turbulence generation device which form the fluidization region are proposed, which result in an overall length of the turbulence generation device in a prescribed range.
  • a plurality of measures which are characterized by a modification of the nozzle or of the turbulence generating device, are also previously known.
  • 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 document discloses DE 297 13 433 U1 an embodiment of a headbox with a nozzle formed from machine-extending boundary surfaces, wherein at least one of the boundary surfaces is characterized by at least three sections with different Konvergenzwinkel.
  • 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.
  • 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 solution according to the invention specifically uses the relationship between the hydraulic division and the cross-section in the nozzle, wherein the formation of the length of the nozzle according to the functional relationship according to the invention has the advantage of a short residence time of the pulp suspension in the nozzle while maintaining the beam quality at the exit from the exit slit offers.
  • the definition of the division surface can be made in different ways. Depending on the design, the determination is based either on the dimensions at the nozzle and the structure of the turbulence generating device or the turbofan generating device alone.
  • the size of the individual dividing surface is determined according to the invention by the quotient of the cross-sectional area of the nozzle at the inlet to the nozzle and the number of individual turbulence-generating channels in the turbulence generating device directly upstream of the nozzle. This definition is almost free from the influence of tolerances.
  • the individual turbulence-generating channel of the turbulence-generating device is designed such that the ratio of the flow cross-section of the channel at the outlet from the turbulence-generating device and the associated division surface of the cross-sectional area of the nozzle at the inlet to the nozzle in the range of each including 0.5 to 0.95, preferably in the range of each including 0.75 to 0.95, more preferably in the range of each including 0.75 to 0.9.
  • Such a headbox according to 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 subordinate forming unit, in which the pulp suspension from the exit slit of the headbox on a string under definition of a line of impact in a free jet or is introduced, get used.
  • the execution of the headbox is carried out such 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. It can be seen from the relationship between high density SD and a formation of fibers and fillers uneven and coarsely cloudy formation by increased flocculation (arrow FL +), that is, the tendency for larger flakes FL in emerging from the exit slit of a headbox free jet of a pulp suspension FS 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, cardboard or tissue webs with inventive length L of the nozzle 4 to reduce the reflocculation That is, back flocculation within the pulp suspension FS before or at the exit from the headbox 1.
  • the headbox 1 is upstream of a forming unit 2, which is here only exemplified by a string, and forms with this a sheet forming unit 3.
  • the function of the headbox 1 is doing so in the machine width spreading at least one pulp suspension 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 significantly accelerate the flow of the pulp suspension FS during 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 turbulence generator 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 one another in rows Rx with x ⁇ 1 and in the vertical direction, that is to say vertically, in the cross-machine direction CD to a writable by the flow direction and the CD direction CD recordable plane 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 division area B T corresponds to the areal proportion of the cross-sectional area of the nozzle 4 at the nozzle start or nozzle inlet 4E assigned to a hydraulic unit E H.
  • the single turbulence-generating channel 7.xy alone or as part of a total unit having or containing unit is referred to as a hydraulic unit EH.
  • This comprises the channel and at least one wall forming or enclosing it.
  • the division area BT can therefore from the quotient of the cross-sectional area at the nozzle start or entry 4E and the number N of isolated flow cross sections, that is, the number N of the individual turbulence generating channels 7.xy be determined.
  • 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.
  • FIG. 3a shows the nozzle 4 and this directly upstream in the flow direction vortex generating means 6.
  • FIG. 3a shows the nozzle 4 and this directly upstream in the flow direction vortex generating means 6.
  • turbulence generating channels 7.11 to 7.31 are shown in three rows with the fluidization 12.11 to 12.31.
  • 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 the flow direction also preferably takes place parallel to each other.
  • the nozzle start cross-sectional area that can be acted upon by a single turbulence-generating channel 7.11 to 7.xy is referred to as a division area BT.
  • the individual hydraulic unit EH is reproduced here by way of example in the form of the unit having the individual turbulence-generating channel 7.11.
  • the proportion of the total cross section at the entrance 4E into the nozzle 4 assigned to the individual turbulence-generating channel 7.11 results from the quotient of the cross-sectional area Q4E at the nozzle start or inlet 4E into the nozzle 4 and the number N of the turbulence-generating channels 7.xy.
  • the proportion of the total cross-section at the inlet 4E in the nozzle 4 as a division surface B T associated with the turbulence-generating channel 7.11 can also be in the illustrated embodiment with walls of the hydraulic units E H of completely rectangular cross section through the product of the dimensions of the hydraulic unit E H , in particular the side lengths t1 and t2 are determined.
  • the division area B T corresponds to the area of the individual hydraulic unit E H , that is to say the cross-sectional area of the turbulence-generating channel at the exit from the turbulence generating device 6 and the surface area resulting from the wall thickness d, ie the sum of the open and closed area of a hydraulic unit E H.
  • the side lengths t1 and t2 correspond to the lengths of a lattice mesh of the turbulence generating device 6 applied to the outlet 6A from the turbulence generating device 6 associated with the individual turbulence-generating channel 7.xy ,
  • the residence time in the nozzle 4 is further influenced by the change in the flow velocity of the individual partial flow when passing from the individual turbulence-generating channel 7.xy into the nozzle 4. If possible, this change should be kept as small as possible.
  • the turbulence generating device 6 is designed and arranged such that the open at the entrance 4E in the nozzle 4 cross-sectional area B TO the division surface B T of the cross-sectional area of the nozzle 4 at the nozzle start, designed and dimensioned such that the exit ratio B TO to B T > 0.5, preferably> 0.75.
  • B TO corresponds to the cross sectional area of the respective turbulence generating channel 7.xy at the exit 6A from the turbulence generating device 6 and thus describes the flow cross section of the respective turbulence generating Canal at the exit 6A.
  • the individual hydraulic units E H of the turbulence generating means 6 are formed as outlet pipes with square cross section.
  • the side lengths t1 and t2 are 25 mm.
  • the wall thickness d is 1 mm.
  • the solution according to the invention applies to headboxes 1, which are formed with or without lamellae.
  • Decisive here is the choice of the length L of the nozzle 4 as a function of the division area B T , which corresponds to the proportion of a single hydraulic unit at the nozzle start section and can be determined as a quotient of the nozzle initial cross-section Q 4E and the number N of the individual hydraulic units E H.
  • 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 (4)

  1. Caisse de tête (1) pour l'utilisation dans une machine de fabrication de nappes fibreuses, en particulier de nappes de papier, de carton ou de papier-tissu, à partir d'au moins une suspension fibreuse (FS), comprenant au moins un dispositif d'amenée (5) acheminant l'au moins une suspension fibreuse (FS), une buse (4) présentant une fente de sortie (11) pour distribuer la suspension fibreuse (FS) en jet libre, et un dispositif de génération de turbulences (6) disposé directement avant la buse (4) dans la direction d'écoulement, dans lequel l'au moins une suspension fibreuse (FS) peut être guidée en flux partiels par une pluralité de canaux générateurs de turbulences (7, 7.xy, 7.11-7.4n), au moins une région formant une région de fluidisation (12, 12.11-12.31) étant prévue à l'intérieur du canal individuel générateur de turbulences (7, 7.xy, 7.11-7.4n), caractérisée en ce que
    la buse (4) présente une longueur (L) qui, en fonction de la taille de la surface proportionnelle, associée à un canal générateur de turbulences individuel (7, 7.xy, 7.11-7.4n) et décrivant une surface de division (BT), de la surface en section transversale (Q4E) de la buse (4) à l'entrée (4E) dans la buse (4), vaut : L = k • B T
    Figure imgb0010
    où
    L est la longueur de la buse (4) ;
    k est une constante, 10 ≤ k ≤ 20 ; et
    BT est une surface de division,
    la taille de la surface de division individuelle (BT) correspondant au quotient de la surface en section transversale (Q4E) de la buse (4) à l'entrée (4E) dans la buse (4) sur le nombre (N) des canaux individuels générateurs de turbulences (7, 7.xy, 7.11-7.4n) dans le dispositif générateur de turbulences (6) disposé directement avant la buse (4).
  2. Caisse de tête (1) selon la revendication 1,
    caractérisée en ce que
    le canal individuel générateur de turbulences (7, 7.xy, 7.11-7.4n) du dispositif générateur de turbulences (6) est réalisé de telle sorte que le rapport de la surface en section transversale du canal individuel générateur de turbulences (7, 7.xy, 7.11-7.4n), décrivant la section transversale d'écoulement à la sortie (6A) du dispositif générateur de turbulences (6), sur la surface de division (BT) associée à celui-ci, de la surface en section transversale (Q4E) à l'entrée (4E) dans la buse (4), soit dans la plage inclusive de 0,5 à 0,95, de préférence dans la plage inclusive de 0,75 à 0,95, particulièrement préférablement dans la plage inclusive de 0,75 à 0, 9.
  3. Unité de formation de feuilles (3) pour des machines de fabrication de nappes fibreuses, en particulier des nappes de papier, de carton ou de papier-tissu, comprenant une caisse de tête (1) selon l'une quelconque des revendications 1 ou 2, et une unité de formage (2) disposée après celle-ci, dans laquelle la suspension fibreuse (FS) est appliquée ou introduite depuis la fente de sortie (11) de la caisse de tête (1) sous forme de jet libre.
  4. Unité de formation de feuilles (3) selon la revendication 3,
    caractérisée en ce que
    l'unité de formage (2) est réalisée sous forme d'une des unités suivantes :
    - formeur hybride ;
    - formeur à fente, comprenant deux toiles formant une fente d'entrée pour la suspension fibreuse (FS), en particulier des tamis à bande ;
    - formeur à toile longitudinale, comprenant un tamis à bande, sur la surface duquel est appliquée la suspension fibreuse (FS) au moyen de la caisse de tête (1).
EP11702220.2A 2010-02-05 2011-02-04 Caisse de tete et unite de formation de feuille comprenant une caisse de tete Active EP2531649B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010001615A DE102010001615A1 (de) 2010-02-05 2010-02-05 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
PCT/EP2011/051647 WO2011095587A1 (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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EP2531649A1 EP2531649A1 (fr) 2012-12-12
EP2531649B1 true EP2531649B1 (fr) 2014-10-08

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EP (1) EP2531649B1 (fr)
CN (1) CN102753754B (fr)
DE (1) DE102010001615A1 (fr)
WO (1) WO2011095587A1 (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
DE102019126296A1 (de) * 2019-09-30 2021-04-01 Voith Patent Gmbh Lamelle für einen Stoffauflauf und Verfahren zur Herstellung einer Lamelle

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1134188A (fr) * 1980-04-03 1982-10-26 Denis Croteau Debiteur de pate pour machine a papier
DE29713433U1 (de) 1997-07-29 1997-09-11 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Stoffauflauf
DE19902623A1 (de) 1999-01-23 2000-07-27 Voith Sulzer Papiertech Patent Stoffauflauf
DE19902621A1 (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
DE10208640A1 (de) * 2002-02-28 2003-09-11 Voith Paper Patent Gmbh Verfahren zur Herstellung einer Faserstoffbahn und Stoffauflauf
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
CN2698833Y (zh) * 2004-05-21 2005-05-11 杭州美辰纸业技术有限公司 水力式网前箱
WO2008077585A1 (fr) 2006-12-22 2008-07-03 Voith Patent Gmbh Arrivée de pâte d'une machine destinée à fabriquer une bande de matière fibreuse
DE102008000564A1 (de) * 2008-03-07 2009-09-10 Voith Patent Gmbh Vorrichtung zur Herstellung und/oder Behandlung einer Faserstoffbahn
DE102009028389A1 (de) * 2009-08-10 2011-02-17 Voith Patent Gmbh Stoffauflauf, Blattbildungseinheit mit einem Stoffauflauf und Verfahren zum Betreiben einer Blattbildungseinheit

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CN102753754B (zh) 2016-03-16
EP2531649A1 (fr) 2012-12-12
CN102753754A (zh) 2012-10-24
WO2011095587A1 (fr) 2011-08-11
DE102010001615A1 (de) 2011-08-11

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