EP2531647A1 - 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

Info

Publication number
EP2531647A1
EP2531647A1 EP11702210A EP11702210A EP2531647A1 EP 2531647 A1 EP2531647 A1 EP 2531647A1 EP 11702210 A EP11702210 A EP 11702210A EP 11702210 A EP11702210 A EP 11702210A EP 2531647 A1 EP2531647 A1 EP 2531647A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
unit
headbox
turbulence
volume
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.)
Granted
Application number
EP11702210A
Other languages
German (de)
English (en)
Other versions
EP2531647B1 (fr
Inventor
Hans Loser
Markus Haeussler
Wolfgang Ruf
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 EP2531647A1 publication Critical patent/EP2531647A1/fr
Application granted granted Critical
Publication of EP2531647B1 publication Critical patent/EP2531647B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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 turbulence-generating channels having a fluidization area for guiding the pulp suspension into partial flows and impinging the nozzle, the individual channels being arranged parallel to one another in the transverse direction of the turbulence-generating device to form rows, and the rows being arranged perpendicular to the transverse direction alongside or above one another.
  • 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 a fibrous suspension jet that is as non-flocculated as possible over the entire width of the headbox 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 constitute an overall Length of the turbulence generating device in a prescribed range result.
  • the document DE 101 06 684 A1 discloses an embodiment of a headbox with specifically designed to avoid flow instabilities within the nozzle and thus a vibrational excitation lamella end having ei ne slope on the side facing the nozzle wall and provided on the side facing away from this with a structure is.
  • 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.
  • publication DE 297 13 433 U 1 discloses an embodiment of a headbox with a boundary surface extending from the machine width. nozzles, in which at least one of the boundary surfaces is characterized by at least three sections with different Konvergenzwinkel.
  • Document DE 102 34 550 A1 discloses an embodiment of a head box in a sheet forming system, in which the nozzle is characterized by a length greater than 400 mm, wherein the length of the upstream turbulence generator preferably also lies in this range.
  • the known measures are not sufficient to suppress 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, develop such that the d-mentioned disadvantages 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 actively carried out by elements which are controllable 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 the dissolution of accumulations, in particular flakes.
  • the area can be in the flow direction Locally considered to be restricted in line with machinery or extended 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 machine cross-section, 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 Maschinenquennchtung 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.
  • Vhydr Unit volume of a hydraulic unit.
  • 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, by means of a diagram, the relationship between the size of the substance density of the used material
  • FIG. 2 illustrates, on the basis of a section of an axial section of a sheet forming unit of a machine for producing a material web, a headbox according to the invention
  • FIG. 3a shows in detail a section of a headbox according to the invention according to Figure 2;
  • FIG. 3b shows a view AA according to FIG. 3a; and
  • Figures 4a to 4c show different nozzle shapes.
  • FIG. 1 illustrates the influence of the pulp density SD of a pulp suspension FS on the formation on the basis of a diagram.
  • 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 a pulp 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 fibrous suspension FS and the tendency of the flock to tilt. This is also dependent on the chosen pulp itself-
  • FIG. 2 shows, in a schematized and highly simplified representation, a section of a headbox 1 designed for use in machines for producing material webs, in particular machines for producing fibrous webs in the form of paper, board or tissue webs with the length L of the nozzle according to the invention 4 for reducing the reflocculation, that is, flocculation within the pulp suspension FS before or at the exit from the headbox 1.
  • the headbox 1 is a forming unit 2, which is here only exemplified by a stringing indicated upstream, and forms with this a sheet forming unit 3.
  • the function of the headbox 1 consists in the machine-wide spreading at least one Faserstoffsus- Pension 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 an element which extends in the cross-machine direction CD and forms a distribution channel, in particular a distributor tube which is tapered in the direction of flow in the direction of the CD in the direction of flow.
  • the pulp suspension FS passes through at least one turbulence generating device 6 to the nozzle 4. Shown here is only one of the nozzle 4 in the flow direction directly upstream turbulence generating device 6.
  • headboxes 1 with a plurality of turbulence generating devices which successively be passed through the interposition of 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 during operation and the pulp suspension FS through an exit gap 1 1 to the forming unit 2 for producing a Discard material web.
  • the exit slit 1 1 is limited here by way of example of an aperture 9 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 with x> 1 and in the vertical direction that is, perpendicular to a plane writable by the flow direction and the CD direction CD are arranged in columns SPy with y> 1 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 any specific, firmly defined structural design and is functionally understood as a flow passage, which can be formed by individual components or through openings integrated into or incorporated into a solid body In the simplest case, this comprises a perforated plate which describes the turbulence-generating channels 7.xy and has through-openings and / or a tube bundle forming the individual turbulence-generating channels 7.xy.
  • the single turbulence-producing channel 7.xy is a flow channel to which means for the generation of turbulences are assigned or integrated in.
  • an energy input into the partial stream guided in the respective channel takes place, with the formation of This area is also referred to as fluidization area 12, wherein within a turbulence-generating channel 7.xy at least one such fluidization area 12, in which a pressure change is generated in the individual partial flow of the pulp suspension FS conducted in the latter, is provided.
  • This can be determined by the geometric design of the individual turbulence-generating channel 7.xy, in particular a local change in the transverse direction which describes it in the flow direction. Section surface and / or the arrangement of additional means for introducing an additional energy input in the individual, in the respective turbulence generating channel 7.xy guided partial flow can be achieved.
  • the headbox 1 is designed and executed such that the residence time of the pulp suspension FS is reduced in the nozzle 4 while maintaining a sufficient quality of the emerging from the exit slit 1 1 free jet.
  • To reduce the residence time in the nozzle 4 with sufficient beam quality in the exit slit 1 1 is determined according to the invention as a function of the nozzle volume V D.
  • the volume V D of the nozzle results from the following relationship:
  • the hydraulic unit E H is understood as meaning the part of turbulence-producing channels 7.xy of a series of channels extending transversely to the throughflow direction, in particular the width direction of the headbox 1, over a predefined length range.
  • 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 show the nozzle 4 and the turbulence generating device 6 which precedes it directly in the direction of flow.
  • FIG. 3a shows the nozzle 4 and the turbulence generating device 6 which precedes it directly in the direction of flow.
  • turbulence-generating channels 7.1 1 to 7.41 are shown here in four rows with the fluidization regions 12.1 1 to 12.41. Shown by hatching is the volume of such a hydraulic unit. This is with V hy d r . Unit designates. This volume corresponds to that which is characterized by the individual turbulence-generating flow channels 7.1 1 to 7.xy and which are set by way of example to a predefined length unit of the outlet width AB.
  • the volume of the smallest hydraulic unit per meter outlet width V h ydr.Einheit is determined according to the invention by the following relationship:
  • the nozzle top height D A is calculated from the sum of the individual heights of the hydraulic units ho, whereby in the case of a headbox with lamellae, the heights of the individual lamella holders must be added.
  • FIG. 3b shows a view of the outlet 6A from the turbulence generating device 6 with a single turbulence generating device extending in the machine transverse direction CD, for example in four rows R1 to R4 and the gaps SPy, here SP1 to SPn Channels 7.1 1 to 7.4n, wherein the individual turbulence generating channels 7.1 1 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 each preferably parallel to each other in machine transverse direction CD with preferably are arranged the same pitch and the arrangement of the rows R1 to R4 perpendicular to the cross-machine direction CD and the 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 the nozzle walls 10.1, 10.2 delimiting them parallel to the flow direction.
  • the length L D of the nozzles 4 in the flow direction is different, and this varies between the individual embodiments in Figures 4a to 4c.
  • the respective lengths are denoted L D i, L D 2 and L D 3, the corresponding volumes of the nozzles 4 with V D i, V D 2 and V D 3.
  • Recognizable in Figure 4a is a nozzle 4 with an inclined nozzle wall 10.2 , which is executed on the nozzle wall 1 0.1 tapered.
  • Figure 4c illustrates an embodiment with also constant change of the nozzle cross-section in the flow direction, this being realized by the converging execution of the individual nozzle walls 10.1 and 10.2.
  • FIG. 4b illustrates an embodiment with a jump-like change in the nozzle cross-section due to an abrupt 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 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 D i, V D 2 and V D 3 of all nozzles are the same.
  • the nozzles 4 of Figures 4a to 4c differ only with respect to their lengths, i.e., L D i L D L D 2 ⁇ 3-
  • 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 formed from forming units 2, in particular wire, hybrid former and double Siebformer.

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  • Paper (AREA)

Abstract

La présente invention concerne une caisse de tête (1) comprenant au moins un dispositif d'amenée (5) qui amène au moins une suspension de matière fibreuse (FS), une buse (4) présentant un espace de sortie (11) et servant à émettre la suspension de matière fibreuse (FS) sous la forme d'un jet libre vers une unité fonctionnelle, disposée en aval, d'une unité de formation (2) disposée en aval de la caisse de tête (1), et un dispositif de production de turbulences (6) disposé directement en amont de la buse (4) dans la direction de circulation et comprenant une pluralité de canaux de production de turbulences (7, 7.xy, 7.11 -7.4n) qui présentent au moins une zone de fluidisation et servent à guider la suspension de matière fibreuse (FS) sous la forme de flux partiels et à solliciter la buse (4), les canaux (7, 7.xy, 7.11 - 7.4n) individuels étant disposés parallèlement entre eux dans la direction transversale du dispositif de production de turbulences (6) pour former 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. La caisse de tête (1) selon l'invention se caractérise en ce que la partie d'une rangée (R1-Rx, R1 -R4) de canaux de production de turbulences (7, 7.xy, 7.11 -7.4n), qui sollicite la buse (4) transversalement à la direction de circulation sur une unité de longueur prédéfinie, forme une unité hydraulique (EH), et en ce que la buse (4) et le dispositif de production de turbulences (6) sont conçus de sorte que le volume qui est désigné par le volume Vunité.hydr. de l'unité hydraulique et peut être sollicité par une unité hydraulique (EH) individuelle est ≤0,005 m3 / m de largeur d'écoulement.
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

Publications (2)

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

Family

ID=43881090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11702210.3A Not-in-force EP2531647B1 (fr) 2010-02-05 2011-02-04 Caisse de tête et unité de formation de feuille comprenant une caisse de tête

Country Status (4)

Country Link
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 Papiermaschinen GmbH, 89522 Heidenheim 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
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011095577A1 *

Also Published As

Publication number Publication date
WO2011095577A1 (fr) 2011-08-11
CN102770597B (zh) 2015-06-10
DE102010001610A1 (de) 2011-08-11
CN102770597A (zh) 2012-11-07
EP2531647B1 (fr) 2014-09-03

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