EP1881106B1 - Caisse de tête d'une machine destinée à la fabrication d'une bande de matière fibreuse - Google Patents

Caisse de tête d'une machine destinée à la fabrication d'une bande de matière fibreuse Download PDF

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Publication number
EP1881106B1
EP1881106B1 EP07112599A EP07112599A EP1881106B1 EP 1881106 B1 EP1881106 B1 EP 1881106B1 EP 07112599 A EP07112599 A EP 07112599A EP 07112599 A EP07112599 A EP 07112599A EP 1881106 B1 EP1881106 B1 EP 1881106B1
Authority
EP
European Patent Office
Prior art keywords
headbox
nozzle
nozzle wall
slat
slice
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.)
Not-in-force
Application number
EP07112599A
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German (de)
English (en)
Other versions
EP1881106A1 (fr
Inventor
Wolfgang Ruf
Hans Loser
Volker Schmidt-Rohr
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 Patent GmbH
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Publication date
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Publication of EP1881106A1 publication Critical patent/EP1881106A1/fr
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Publication of EP1881106B1 publication Critical patent/EP1881106B1/fr
Not-in-force legal-status Critical Current
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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
    • D21F1/028—Details of the nozzle section

Definitions

  • the invention relates to a headbox for a machine for producing a fibrous web from a pulp suspension, having a headbox having an upper nozzle wall and a lower nozzle wall and two side walls, tapering to a gap and a flowed through by the pulp suspension nozzle headbox, wherein the nozzle space of the headbox at least partially divided by a plurality of slats extending from the inlet end in the flow direction end of the nozzle into the nozzle chamber, and wherein on the upper nozzle wall outlet side a positionable and extending over the machine width aperture is arranged.
  • the fibrous web formed from the pulp suspension may in particular be a paper, board or tissue web.
  • Such a headbox is for example from the European patent applications EP 1 452 640 A2 and EP 1 489 224 A1 known. Its asymmetrical headbox nozzle leads to a more or less pronounced two-sidedness of the so-called layer orientation between the top and bottom of the finished fibrous web.
  • a layer here is a height range of a finished fibrous web formed from a pulp suspension partial flow. Due to the flow conditions in the headbox and the shear forces in the former, a certain orientation of the fibers contained in the pulp suspension forms in the layer.
  • the orientation of the fibers (layer Orientation) is defined by the ratio of machine direction orientation (MD) and cross machine direction (CD) orientation.
  • the layer orientation can be determined either optically or by the ratio of the layer strength (MD) and the layer strength (CD).
  • MD layer strength
  • CD layer strength
  • the different layer orientation leads, in particular in the production of wood-free fibrous webs, to sometimes serious problems during further processing.
  • the curl can be cited for copying papers which may no longer be usable, that is to say salable, due to too great a curl tendency.
  • the non-dazzle further nozzle wall - seen in the flow direction of the pulp suspension - a preferably adjustable supernatant in the range of 0 to 20 mm, preferably in the range of 0 to 10 mm, relative to the diaphragm and that a combination of at least one longer lamella and at least one shorter lamella is provided, wherein the respective longer lamella of the aperture having upper nozzle wall is associated.
  • the arrangement of the lamellae in the headbox nozzle can directly influence the velocity profile in the z-direction (height direction) of the pulp suspension jet.
  • the speed in this half can be reduced by increased friction between the at least one longer lamella and the pulp suspension.
  • the two-sidedness of the layer orientation between the top and bottom of the fibrous web can be selectively influenced, the headbox, and even the machine can be adapted to the requirements of different wood-free fibrous webs.
  • the term "assignment” describes the spatial position of a lamella within the headbox nozzle.
  • the headbox nozzle of a Ein Anlagenenstoffauflaufs can basically be divided into two halves, wherein one half is disposed adjacent to the nozzle wall having the aperture.
  • the "assignment" of a lamella to the diaphragm having the upper nozzle wall thus means that it is spatially arranged in the upper nozzle wall of this adjacent half of the headbox nozzle.
  • the headbox according to the invention thus has at least two groups of lamellae, a first group with longer lamellae, which is associated with the upper nozzle wall having the diaphragm, and at least one further, in particular a second group with shorter lamellae, the facing away from the aperture upper nozzle wall.
  • the respective longer lamella preferably has a lamella length in the range of 75 to 130%, preferably in the range of 80 to 120% of the length of the headbox nozzle. Should this particular longer lamella be beyond the aperture, it should not exceed a protrusion of 0 to 20 mm from the headbox to avoid leaf disturbances, for example in the form of white spots.
  • the respective shorter lamella preferably has a lamellar length in the range of ⁇ 80%, preferably ⁇ 75%, of the length of the headbox nozzle.
  • at least some, preferably all slats have an adjustable slat length. Corresponding devices for adjusting slat lengths are known to the person skilled in the art from a large number of publications.
  • lamellae are preferably provided at least in regions with a structured surface.
  • This structured surface may, for example, be a downstream and structured lamella tip, wherein the structure may take the form of grooves of rectangular and / or wedge-shaped and / or parabolic and / or round shape with constant and / or different depth.
  • the iris-free lower nozzle wall-viewed in the flow direction of the pulp suspension-can have a preferably adjustable board from projection to gap height in the range from 0 to 10, preferably in the range from 1 to 5, since in this area the influence of the iris-free lower nozzle wall on the layers Orientation can be minimized in an excellent way.
  • the diaphragm has a main surface touched by the pulp suspension which runs parallel to the inner surface of the associated upper nozzle wall. This provides a fluidically optimal design of the end region of the headbox, in particular the aperture for reducing the jet contraction.
  • the headbox according to the invention can also be followed by a gap former with two endless sieves, each forming a sieve loop, of which the first sieve is guided via a forming device with a curved support surface and the second sieve over a further element is passed, the two sieves thereafter together to form a wedge-shaped material inlet gap which receives the fibrous suspension directly from the headbox according to the invention, converge in the region of the former or after the expiration of the two sieves of the respective element and then form a Doppelsiebrate.
  • the aperture upper nozzle wall may be the same or mutually arranged the forming device.
  • the jet velocity profile ie the effect of the longer slats used there, immediately frozen.
  • the shaping device preferably has at least one forming roller or a forming shoe from a technological point of view, whereas the further element may comprise at least one breast roll.
  • FIG. 1 shows a schematic and sectional view of a headbox 1 for a machine for producing a merely schematically indicated fibrous web 2 from a pulp suspension 3.
  • the fibrous web 2 formed from the pulp suspension 3 may in particular be a paper, board or tissue web.
  • the headbox 1 has an upper nozzle wall 5 and a lower nozzle wall 6 and two side walls 7, 8, not shown, tapering to a gap 9 and a flowed through by the pulp suspension 2 nozzle chamber 10 having headbox 4.
  • the nozzle chamber 10 of the headbox nozzle 4 is at least partially divided by a plurality of fins 11.1 to 11.4, which extend starting from the flow direction R (arrow) inlet side nozzle end 12 into the nozzle chamber 10.
  • a positionable and over the machine width B (arrow) extending aperture 13 is arranged on the outlet side of the upper nozzle wall 5.
  • the aperture 13 is, for example, of several, across the machine width B (arrow) Distributed and not shown adjusting devices (arrow 14), in particular spindle drives, for the purpose of their positioning applied.
  • the respective longer lamella 11.1, 11.2 has a lamella length LL in the range of 75% (representation) to 130% (dashed line), preferably in the range of 80 to 120% of the length LD of the headbox nozzle 4.
  • the respective shorter lamella 11.3, 11.4 has a lamellar length LL in the range of ⁇ 80%, preferably ⁇ 75%, of the length LD of the headbox nozzle 4. So there are slats 11.1, 11.2 and 11.3, 11.4 provided with only two different slat lengths LL. At least some, preferably all slats 11.1 to 11.4 can have an adjustable slat length LL.
  • the longer fins 11.1, 11.2 are provided at least in regions with a structured surface 15.
  • the structured surface 15 forms a downstream and structured fin tip 16, which structure may be in the form of grooves of rectangular and / or wedge-shaped and / or parabolic and / or round shape with constant and / or different depths.
  • the iris-free lower nozzle wall 6 - seen in the flow direction R (arrow) of the pulp suspension 3 - has a preferably adjustable supernatant L in the range of 0 to 20 mm, preferably in the range of 0 to 10 mm, relative to the diaphragm 13 on.
  • the adjustability of the supernatant L is indicated by a double arrow E.
  • the iris-free lower nozzle wall 6 - seen in the flow direction R (arrow) of the pulp suspension 3 - a preferably adjustable board V of supernatant L to gap height s in the range of 0 to 10, preferably in the range of 1 to 5, on.
  • the preferably adjustable board V of the lower nozzle wall 6 is on the German Offenlegungsschrift DE 103 24 711 A1 directed.
  • the orifice 13 of the headbox 1 may moreover have a main surface 17 which is in contact with the pulp suspension 3 and runs parallel to the inner surface 18 of the upper nozzle wall 5.
  • this "parallel diaphragm" 13 is based on the German patent application DE 10 2004 047 879 A1 directed.
  • FIG. 1 the velocity profile G in the z-direction (height direction, double arrow) of the pulp suspension jet formed from the pulp suspension 3 is shown.
  • This velocity profile G has due to the asymmetric arrangement of the slats 11.1, 11.2 and 11.3, 11.4 as well as a clear asymmetry.
  • the beam is significantly slower on the upper side, ie on the side with the longer fins 11.1, 11.2.
  • FIG. 2 shows a schematic and sectional side view of a downstream part of a first embodiment of a headbox 4 of a headbox 1 according to the invention with downstream Spaltformer 200th
  • the gap former 200 has two endless sieves 201, 202, each forming a sieve loop 203, 204, of which the first sieve 201 is guided via a forming device 205 with a curved support surface 206 and the second sieve 202 is guided over a further element 207. Thereafter, the two screens 201, 202 together to form a wedge-shaped material inlet gap 208, which receives the fibrous suspension 3 directly from the headbox 1 according to the invention. Subsequently, the two sieves 203, 204 with the introduced pulp suspension 3 form a twin-wire section 209.
  • the former 205 is configured as a forming roller 210, whereas the other member 207 is configured as a breast roller 211.
  • the shaping device 205 can also be designed as a forming shoe in a further embodiment.
  • the aperture 13 having the upper nozzle wall 5 is mutually arranged in the present embodiment of the former 205.
  • FIG. 3 shows a schematic and sectional side view of a downstream part of a second embodiment of a headbox 4 of a head box 1 according to the invention with downstream Spaltformer 200th
  • the aperture 13 having the upper nozzle wall 5 is arranged on the same side of the former 205.
  • the lower nozzle wall 6 is again glare-free.
  • a headbox of the type mentioned is further developed such that on the one hand, the two-sidedness of the layer orientation between the top and bottom of the fibrous web can be selectively influenced and on the other hand leaf disorders, for example in the form of white spots, improved can be avoided.

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Claims (12)

  1. Caisse de tête (1) pour une machine de fabrication d'une bande de matière fibreuse (2) à partir d'une suspension de matière fibreuse (3), avec une buse de caisse de tête (4) présentant une paroi de buse supérieure (5) et une paroi de buse inférieure (6) ainsi que deux parois latérales (7, 8), se rétrécissant en une fente (9) et présentant une chambre de buse (10) traversée par la suspension de matière fibreuse (3), dans laquelle la chambre de buse (10) de la buse de caisse de tête (4) est divisée au moins localement par plusieurs lamelles (11.1 à 11.4), qui s'étendent dans la chambre de buse (10) à partir de l'extrémité de buse (2) située du côté de l'entrée dans le sens d'écoulement (R) et dans laquelle un écran (13) réglable en position et s'étendant sur la largeur de la machine (B) est disposé sur la paroi de buse supérieure (5), caractérisée en ce que la paroi de buse inférieure (6) sans écran - vue dans le sens d'écoulement (R) de la suspension de matière fibreuse (3) - présente un dépassement de préférence réglable (L) de l'ordre de 0 à 20 mm, de préférence de l'ordre de 0 à 10 mm, par rapport à l'écran (13), et en ce qu'il est prévu une combinaison d'au moins une lamelle plus longue (11.1, 11.2) et d'au moins une lamelle plus courte (11.3, 11.4), dans laquelle la lamelle plus longue respective (11.1, 11.2) est associée à la paroi de buse supérieure (5) qui présente l'écran (13).
  2. Caisse de tête (1) selon la revendication 1, caractérisée en ce que toutes les lamelles plus longues (11.1, 11.2) sont associées à la paroi de buse supérieure (5) qui présente l'écran (13).
  3. Caisse de tête (1) selon la revendication 1 ou 2, caractérisée en ce que la lamelle plus longue respective (11.1, 11.2) présente une longueur de lamelle (LL) de l'ordre de 75 à 130 %, de préférence de l'ordre de 80 à 120 % de la longueur (LD) de la buse de caisse de tête (4).
  4. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que la lamelle plus courte respective (11.3, 11.4) présente une longueur de lamelle (LL) de l'ordre de ≤ 80 %, de préférence de ≤ 75 % de la longueur (LD) de la buse de caisse de tête (4).
  5. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins quelques-unes, de préférence toutes les lamelles (11.1 à 11.4) présentent une longueur de lamelle (LL) réglable.
  6. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu des lamelles (11.1 à 11.4) ne présentant que deux longueurs de lamelle (LL) différentes.
  7. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que quelques-unes, de préférence toutes les lamelles (11.1 à 11.4) sont dotées au moins localement d'une surface structurée (15).
  8. Caisse de tête (1) selon l'une quelconque des revendications précédentes, en particulier selon la revendication 7, caractérisée en ce que la paroi de buse inférieure (6) sans écran - vue dans le sens d'écoulement (R) de la suspension de matière fibreuse (3) - présente un rapport de la saillie (V) du dépassement (L) à la hauteur de la fente (s) de l'ordre de 0 à 10, de préférence de l'ordre de 1 à 5.
  9. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que l'écran (13) présente une face principale (17) en contact avec la suspension de matière fibreuse (3), qui est parallèle à la face intérieure (18) de la paroi de buse supérieure associée (5).
  10. Machine pour la fabrication d'une bande de matière fibreuse (2) à partir d'une suspension de matière fibreuse (3), comprenant une caisse de tête (1) qui est suivie, dans le sens de défilement de la machine, par un appareil de formation à fente (200) avec deux toiles sans fin (201, 202) qui forment chacune une boucle de toile (203, 204), parmi lesquelles la première toile (201) est conduite avec une face d'appui incurvée (206) sur un dispositif de formation (205) et la deuxième toile (202) est conduite sur un autre élément (207), les deux toiles (201, 202) se rejoignent ensuite, en formant une fente d'entrée de pâte (208) en forme de coin qui reçoit ladite au moins une suspension de matière fibreuse (3) immédiatement à la sortie de la caisse de tête (1), dans la région du dispositif de formation (205) sur celui-ci après la sortie des deux toiles de l'élément respectif et forment ensuite une section à deux toiles (209), caractérisée en ce que la caisse de tête (1) est réalisée selon l'une quelconque des revendications 1 à 10 et en ce que la paroi de buse supérieure (5) présentant l'écran (13) est disposée du côté opposé ou du même côté que le dispositif de formation (205).
  11. Machine selon la revendication 10, caractérisée en ce que le dispositif de formation (205) présente au moins un rouleau de formation (210) ou un sabot de formation.
  12. Machine selon la revendication 10 ou 11, caractérisée en ce que l'autre élément (207) présente au moins un rouleau de tête (211).
EP07112599A 2006-07-21 2007-07-17 Caisse de tête d'une machine destinée à la fabrication d'une bande de matière fibreuse Not-in-force EP1881106B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006033847A DE102006033847A1 (de) 2006-07-21 2006-07-21 Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP1881106A1 EP1881106A1 (fr) 2008-01-23
EP1881106B1 true EP1881106B1 (fr) 2012-03-28

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Application Number Title Priority Date Filing Date
EP07112599A Not-in-force EP1881106B1 (fr) 2006-07-21 2007-07-17 Caisse de tête d'une machine destinée à la fabrication d'une bande de matière fibreuse

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EP (1) EP1881106B1 (fr)
AT (1) ATE551470T1 (fr)
DE (1) DE102006033847A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007036945A1 (de) * 2007-08-04 2009-02-05 Voith Patent Gmbh Verfahren zur Beeinflussung der Zweiseitigkeit der Layer Orientation und Stoffauflauf zur Durchführung des Verfahrens
EP2199459A1 (fr) * 2008-12-16 2010-06-23 Voith Patent GmbH Système de formation de feuille pour une machine destinée à la fabrication d'une bande de matière fibreuse multicouche
DE102009000696A1 (de) 2009-02-06 2010-08-12 Voith Patent Gmbh Verfahren zur Herstellung einer mehrlagigen Faserstoffbahn und Blattbildungsvorrichtung zur Durchführung des Verfahrens

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29713272U1 (de) * 1997-07-25 1997-11-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Stoffauflauf zur Bildung einer Faserstoffsuspensionsschicht
DE10211178A1 (de) * 2002-03-14 2003-09-25 Voith Paper Patent Gmbh Stoffauflauf einer Paper- oder Kartonmaschine
DE10308555A1 (de) 2003-02-27 2004-10-21 Voith Paper Patent Gmbh Stoffauflauf
DE10318035A1 (de) 2003-04-19 2004-11-04 Voith Paper Patent Gmbh Stoffauflauf
DE10324711A1 (de) * 2003-05-30 2004-12-30 Voith Paper Patent Gmbh Stoffauflauf
DE102004047879A1 (de) * 2004-10-01 2006-04-06 Voith Paper Patent Gmbh Stoffauflauf
DE102004000051A1 (de) * 2004-11-19 2006-05-24 Voith Paper Patent Gmbh Stoffauflauf einer Maschine zur Herstellung einer Fasersstoffbahn

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Publication number Publication date
ATE551470T1 (de) 2012-04-15
EP1881106A1 (fr) 2008-01-23
DE102006033847A1 (de) 2008-01-24

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