EP1811081B1 - Caisse de tête d'une machine pour fabriquer une bande fibreuse - Google Patents

Caisse de tête d'une machine pour fabriquer une bande fibreuse Download PDF

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Publication number
EP1811081B1
EP1811081B1 EP06124863A EP06124863A EP1811081B1 EP 1811081 B1 EP1811081 B1 EP 1811081B1 EP 06124863 A EP06124863 A EP 06124863A EP 06124863 A EP06124863 A EP 06124863A EP 1811081 B1 EP1811081 B1 EP 1811081B1
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EP
European Patent Office
Prior art keywords
headbox
turbulence
flow channels
flow
generating means
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
EP06124863A
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German (de)
English (en)
Other versions
EP1811081A3 (fr
EP1811081A2 (fr
Inventor
Wolfgang Ruf
Klaus Lehleiter
Karl Bunz
Konstantin Fenkl
Hans Loser
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Priority to PL06124863T priority Critical patent/PL1811081T3/pl
Publication of EP1811081A2 publication Critical patent/EP1811081A2/fr
Publication of EP1811081A3 publication Critical patent/EP1811081A3/fr
Application granted granted Critical
Publication of EP1811081B1 publication Critical patent/EP1811081B1/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

Definitions

  • the invention relates to a headbox of a machine for producing a fibrous web, in particular paper or board web, from at least one pulp suspension, with at least one feed device feeding the at least one pulp suspension and at least one turbulence generating means in which the at least one pulp suspension by a Variety of one inlet side and one outlet side having flow channels flows, thereby divided into turbulent pulp suspension partial flows and merged after exiting the turbulence generating means in a preferably machine-wide chamber, wherein the respective outlet side has a flat, formed by the end of the respective flow channel outlet surface and wherein the respective outlet surface of the respective flow channel is formed in each case from a polygon side having a plurality of polygon sides.
  • Such a headbox is for example from the document DE 101 40 416 A1 known.
  • the lattice tracking flow and any segregation effects should be kept to a minimum.
  • the respective polygon has at least two inner angles which are smaller than 90 °, in particular smaller than 75 °, and that all polygon sides of the respective polygon are oriented differently from the vertical of the turbulence generating means.
  • the vertical of the turbulence generating means is aligned by definition orthogonal to the cross machine direction (CD direction); It therefore corresponds to the so-called z-axis when viewed locally in or against the machine direction (MD direction).
  • the deviating orientation indicates a non-parallel orientation of the polygon sides to the perpendicular of the turbulence generating means.
  • At least some of the polygons are formed of triangles, preferably of equilateral triangles.
  • one side of the triangle is aligned along the baseline, ie transversely to the flow direction of the at least one pulp suspension.
  • the triangles have the not negligible advantage that the land areas are reduced to a minimum.
  • all flow channels may have triangular outlet surfaces.
  • the headbox may also have flow channels arranged in several rows.
  • the flow channels of at least two adjacent rows can be arranged mirror-inverted or rectified to one another.
  • they can also be offset, preferably arranged in half offset from one another.
  • a lamella is arranged at least between two, preferably between all adjacent rows, which is connected in an articulated manner to the turbulence generating means by means of a preferably hinge-like lamella holder.
  • At least some of the polygons are formed of diamonds or kites.
  • the flow channels of at least two adjacent lines can in turn be mirror-inverted and half offset from each other.
  • the flow channels preferably have flow cross-sections which expand continuously and / or in steps in the direction of flow of the at least one fibrous suspension. As a result, it is possible to influence the turbulence in the at least one pulp suspension in a targeted manner.
  • the flow channels on the inlet side preferably have round, ie rotationally symmetrical inlet surfaces.
  • the turbulence generating means is in a preferred embodiment a turbulence generator or a tube bank.
  • the feeding device is arranged directly upstream of the latter in the direction of flow of the at least one fibrous suspension and downstream of the at least one fibrous suspension in the flow direction is a preferably machine-wide intermediate chamber.
  • the flow channels are preferably formed from a multiplicity of turbulence tubes and / or turbulence tube inserts. These components are preferably at least partially welded to the contact surfaces to the adjacent components with these, soldered and / or glued.
  • the headbox according to the invention is outstandingly suitable for use in a machine for producing a fibrous web, in particular paper or board web.
  • the headbox may be provided in a further embodiment with a well-known from a variety of publications dilution water control.
  • the fibrous web produced in the machine with a headbox according to the invention thus has consistently excellent properties, since, inter alia, the control of both its fiber orientation transverse profile and its basis weight cross-section is possible.
  • FIGS. 1a and 1b show vertical longitudinal sections through headboxes 1 a machine for producing a fibrous web, in particular paper or board web, from a pulp suspension 2.
  • the illustrated headboxes 1 can of course also be configured as multi-layer casseroles, which use at least two different pulp suspensions for producing a fibrous web.
  • the fibrous web may in particular be a paper, board or tissue web.
  • the Indian FIG. 1a Headbox 1 shown has a feeding device 3 which feeds the pulp suspension 2, for example in the embodiment of a transverse distributor pipe 4 shown or a rotary distributor (not illustrated) with a multiplicity of hoses.
  • the headbox 1 has a turbulence generator 5 (turbulence generating means) arranged downstream of the feeder 3 in the flow direction R (arrow) of the pulp suspension 2.
  • This turbulence generator 5 has a plurality of preferably in lines Z.1 to Z.4 and in columns S ( FIG. 2 ) and only schematically shown flow channels 6 ( FIG. 2 ) on.
  • the flow channels 6 are preferably formed in a known manner as thin-walled turbulence tubes and / or turbulence tube inserts with at least partially constant, at least partially diverging, at least partially converging and / or discontinuous flow cross sections.
  • the flow channels 6 are flowed through by the pulp suspension 2, wherein they are divided into turbulent pulp suspension partial flows 7 (FIG. FIG. 2 ) and after the exit from the turbulence generator 5 in a the turbulence generator 5 in the flow direction R (arrow) of the pulp suspension 2 downstream headbox 8 is brought together again to allow the formation of a machine-wide fibrous web.
  • the headbox 8 can be considered as a machine-wide chamber.
  • the Indian Figure 1 b illustrated headbox 1 corresponds at least in the second part of the flow path of the pulp suspension 2 in the FIG. 1a illustrated headbox. Thus, reference is hereby made to its description.
  • the headbox 1 of FIG. 1b between the feeding device 3 feeding the pulp suspension 2 and the turbulence generator 5 and in the flow direction R (arrow) of the pulp suspension 2 both a tube bank 9 (further turbulence generating means) and a preferably machine-wide chamber 10.
  • the chamber 10, which is also referred to as the intermediate chamber, may in a further embodiment have a plurality of partition walls, which at least in sections subdivide it into a plurality of sectioned partial chambers.
  • the tube bank 9 has a plurality of preferably in lines Z.1 to Z.4 and in columns S ( FIG. 2 ) and only schematically shown flow channels 6 ( FIG. 2 ) on.
  • the flow channels 6 are preferably formed in a known manner as thin-walled turbulence tubes and / or turbulence tube inserts with at least partially constant, at least partially diverging, at least partially converging and / or discontinuous flow cross sections.
  • the flow channels 6 are flowed through by the pulp suspension 2, wherein they are divided into turbulent pulp suspension partial flows 7 (FIG. FIG. 2 ) and after the exit from the tube bank 9 in the preferably machine-width chamber 10 is brought together again.
  • the preferably machine-wide chamber 10 in the flow direction R (arrow) of the pulp suspension 2 downstream turbulence generator 5 may be similar or even identical to that in the FIG. 1a be shown turbulence generator 5.
  • FIGS. 1a and 1b illustrated headbox 1 can both a straight basic contour ( FIG. 1a ) as well as a curved basic contour ( FIG. 1b ) exhibit.
  • the flow channels 6 of the turbulence generating means 5, 9 each have an inlet side 11 and an outlet side 12.
  • the respective outlet side 12 has a flat outlet surface 13 formed by the end of the respective flow channel 6.
  • the flow channels 6 On the inlet side 11, the flow channels 6 have round inlet surfaces 14.
  • FIGS. 2 to 6 show schematic views of the at least one turbulence generating means 5, 9 of the headbox 1 of FIGS. 1a and 1b against the flow direction R (arrow) of the pulp suspension second
  • each turbulence generating means 5, 9 a vertical A (double arrow), which is aligned by definition orthogonal to the cross-machine direction (CD direction), ie the so-called z-axis when viewed locally in or against the machine direction (MD direction) corresponds ,
  • the cross machine direction (CD direction) is identical to the orientation of the at least one row Z.
  • the outlet surfaces 13 of the flow channels 6 are each composed of a plurality of polygon sides 15.1 to 15.3 (FIG. FIGS. 2 to 4 and 6 ), 15.1 to 15.4 ( FIG. 5 ) having polygon 15, which has at least two internal angles ⁇ , ⁇ , which are smaller than 90 °, in particular smaller than 75 °.
  • the interior angles ⁇ , ⁇ are given for the sake of clarity only for an outlet surface 13 of a flow channel 6.
  • all outlet surfaces 13 of all flow channels 6 have such internal angles ⁇ , ⁇ .
  • polygon sides 15.1 to 15.3 ( FIGS. 2 to 4 and 6 ), 15.1 to 15.4 ( FIG. 5 ) of the respective polygon 15 are deviated from the vertical A (double arrow) of the turbulence generating means 5, 9.
  • the polygon sides 15.1 to 15.3 ( FIGS. 2 to 4 and 6 ), 15.1 to 15.4 ( FIG. 5 ) of the respective polygon 15 are shown for the sake of clarity only for a corresponding outlet surface 13 of at least one flow channel 6.
  • polygons 15 are formed from the same triangles 16.
  • the triangles 16 are here equilateral triangles, so that they have three internal angles ⁇ , ⁇ , ⁇ , which are smaller than 90 °, in particular smaller than 75 °.
  • the three internal angles ⁇ , ⁇ , ⁇ are each exactly 60 °.
  • the triangles 16 are generally at least as isosceles, preferably formed and even formed as equilateral triangles.
  • the flow channels 6 at least two adjacent rows Z are arranged mirror images of each other.
  • the mirror axis 17 is formed by a line. Alternatively, they are rectified and offset, preferably arranged in half offset from one another.
  • At least some of the polygons 15 of the row Z are formed from diamonds 18.
  • the free spaces 19 present between the adjacent diamonds 18 of a row Z can in turn be provided, as indicated, with flow channels 6, whose outlet surfaces 13 can be formed from at least isosceles, preferably equilateral triangles 20.
  • each rhombus 18 has at least two internal angles ⁇ , ⁇ which are smaller than 90 °, in particular smaller than 75 °.
  • the triangles 20 are here equilateral triangles, so that they have three internal angles ⁇ , ⁇ , ⁇ , which are smaller than 90 °, in particular smaller than 75 °.
  • the three internal angles ⁇ , ⁇ , ⁇ are each exactly 60 °.
  • kitse quadrants 21 are formed of kite quadrants 21.
  • the free spaces 22 present between the adjacent kite quadrilaterals 21 of a row Z can, in turn, in turn be provided with flow channels 6 of the adjacent, mirror-inverted and half-displaced ones, or be provided with the same row Z.
  • the mirror axis 17 is formed by a line.
  • the outlet surfaces 13 of the flow channels 6 can be formed of kite quadrilaterals 21 or of at least isosceles, preferably equilateral triangles 23.
  • each kite quadrilateral 21 at least two internal angles ⁇ , ⁇ , which are smaller than 90 °, in particular smaller than 75 °.
  • ⁇ , ⁇ which are smaller than 90 °, in particular smaller than 75 °.
  • isosceles triangles 23 which each have two internal angles ⁇ , ⁇ , which are smaller than 90 °, in particular smaller than 75 °.
  • FIG. 6 shows a further possible embodiment of the turbulence generating means of the headbox 1 in the form of a turbulence generator 5.
  • a turbulence generator 5 at least between two adjacent rows Z a known to those skilled slat 24 (FIG. FIGS. 1a and 1b ) arranged.
  • a lamella 24 is arranged between all adjacent rows Z in each case.
  • the blade 24 is known by a person skilled in the art and, for example in the German Offenlegungsschrift DE 199 62 709 A1 disclosed and preferably hinge-like blade holder 25 hingedly connected to the turbulence generating means 5, 9. The content of this document is hereby made the subject of the present description.
  • the characteristics of in the FIGS. 2 to 6 shown embodiments of the flow channels 6 of the headbox 1 can also be at least partially combined with one another for the expert in a suitable manner.
  • headbox 1 is particularly suitable for use in a machine for producing a fibrous web, in particular paper or board web.
  • the present invention provides a headbox of the type mentioned in the introduction, which avoids the disadvantages of the prior art as far as possible, preferably completely, and thus generates a flow which is as homogeneous as possible immediately downstream of the turbulence generating means. In particular, the lattice tracking flow and any segregation effects are minimized.

Landscapes

  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (15)

  1. Caisse de tête (1) d'une machine pour la fabrication d'une bande de matière fibreuse, en particulier d'une bande de papier ou de carton à partir d'au moins une suspension de matière fibreuse (2), avec au moins un dispositif d'alimentation (3) amenant au moins une suspension de matière fibreuse (2) et avec au moins un moyen de formation de turbulence (5; 9), dans lequel, pendant le fonctionnement de la caisse de tête (1), ladite au moins une suspension de matière fibreuse (2) s'écoule à travers une pluralité de canaux d'écoulement (6) présentant chacun un côté d'entrée (11) et un côté de sortie (12), est ainsi divisée en écoulements partiels turbulents (7) de suspension de matière fibreuse et est de nouveau réunie, après la sortie du moyen de formation de turbulence (5; 9), dans une chambre (8; 10) ayant de préférence la largeur de la machine, dans laquelle le côté de sortie respectif (12) présente une face de sortie plane (13) formée par l'extrémité du canal d'écoulement respectif (6) et dans laquelle la face de sortie respective (13) du canal d'écoulement respectif (6) est formée respectivement par un polygone (15) présentant plusieurs côtés de polygone (15.1 à 15.3; 15.1 à 15.4), caractérisée en ce que le polygone respectif (15) présente au moins deux angles intérieurs (α, β; α, β, γ), qui sont inférieurs à 90°, en particulier inférieurs à 75°, et en ce que tous les côtés de polygone (15.1 à 15.3; 15.1 à 15.4) du polygone respectif (15) sont orientés en s'écartant de la verticale (A) du moyen de formation de turbulence (5; 9).
  2. Caisse de tête (1) selon la revendication 1, caractérisée en ce qu'au moins certains des polygones (15) sont formés de triangles (16; 20; 23), de préférence de triangles équilatéraux (16; 20; 23).
  3. Caisse de tête (1) selon la revendication 2, caractérisée en ce que les canaux d'écoulement (6) sont agencés en plusieurs lignes (Z; Z.1 à Z.4).
  4. Caisse de tête (1) selon la revendication 3, caractérisée en ce que les canaux d'écoulement (6) d'au moins deux lignes voisines (Z; Z.1 à Z.4) sont disposés symétriquement les uns par rapport aux autres.
  5. Caisse de tête (1) selon la revendication 3, caractérisée en ce que les canaux d'écoulement (6) d'au moins deux lignes voisines (Z; Z.1 à Z.4) sont disposés avec la même orientation les uns par rapport aux autres.
  6. Caisse de tête (1) selon la revendication 4 ou 5, caractérisée en ce que les canaux d'écoulement (6) d'au moins deux lignes voisines (Z; Z.1 à Z.4) sont disposés en décalage, de préférence en décalage de moitié les uns par rapport aux autres.
  7. Caisse de tête (1) selon l'une quelconque des revendications 3 à 6, caractérisée en ce qu'une lamelle (24) est disposée au moins entre deux lignes, de préférence entre toutes les lignes voisines (Z; Z.1 à Z.4), et est reliée de façon articulée au moyen de formation de turbulence (5; 9) au moyen d'un support de lamelle (25) de préférence en forme de charnière.
  8. Caisse de tête (1) selon la revendication 1, caractérisée en ce qu'au moins certains des polygones (15) sont formés par des losanges (18).
  9. Caisse de tête (1) selon la revendication 1, caractérisée en ce qu'au moins certains des polygones (15) sont formés par des quadrilatères en forme de cerfs-volants (21).
  10. Caisse de tête (1) selon la revendication 8 ou 9, caractérisée en ce que les canaux d'écoulement (6) d'au moins deux lignes voisines (Z; Z.1 à Z.4), sont disposés de façon symétrique et en décalage de moitié les uns par rapport aux autres.
  11. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que les canaux d'écoulement (6) présentent des sections transversales d'écoulement qui s'élargissent en continu et/ou par paliers dans la direction d'écoulement (R) de ladite au moins une suspension de matière fibreuse (2).
  12. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que les canaux d'écoulement (6) présentent des faces d'entrée rondes (14) sur le côté d'entrée (11).
  13. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le moyen de formation de turbulence est un générateur de turbulence (5), qui est précédé, dans la direction d'écoulement (R) de ladite au moins une suspension de matière fibreuse (2), par une chambre intermédiaire (10) ayant de préférence la largeur de la machine, et en ce que le générateur de turbulence (5) est suivi, dans la direction d'écoulement (R) de ladite au moins une suspension de matière fibreuse (2), par une buse de caisse de tête (8) ayant la largeur de la machine.
  14. Caisse de tête (1) selon l'une quelconque des revendications 1 à 12, caractérisée en ce que le moyen de formation de turbulence est un banc de tubes (9), qui est précédé immédiatement, dans la direction d'écoulement (R) de ladite au moins une suspension de matière fibreuse (2), par le dispositif d'alimentation (3), et en ce que le banc de tubes (9) est suivi, dans la direction d'écoulement (R) de ladite au moins une suspension de matière fibreuse (2), par une chambre intermédiaire (10) ayant de préférence la largeur de la machine.
  15. Machine pour la fabrication d'une bande de matière fibreuse, en particulier d'une bande de papier ou de carton, avec une caisse de tête (1) selon l'une quelconque des revendications 1 à 14.
EP06124863A 2006-01-20 2006-11-28 Caisse de tête d'une machine pour fabriquer une bande fibreuse Not-in-force EP1811081B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06124863T PL1811081T3 (pl) 2006-01-20 2006-11-28 Skrzynia wlewowa maszyny do wytwarzania wstęgi surowca włóknistego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006002788A DE102006002788A1 (de) 2006-01-20 2006-01-20 Stofflaufbahn einer Maschine zur Herstellung einer Faserstoffbahn

Publications (3)

Publication Number Publication Date
EP1811081A2 EP1811081A2 (fr) 2007-07-25
EP1811081A3 EP1811081A3 (fr) 2009-12-23
EP1811081B1 true EP1811081B1 (fr) 2011-03-30

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EP06124863A Not-in-force EP1811081B1 (fr) 2006-01-20 2006-11-28 Caisse de tête d'une machine pour fabriquer une bande fibreuse

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EP (1) EP1811081B1 (fr)
AT (1) ATE503885T1 (fr)
DE (2) DE102006002788A1 (fr)
PL (1) PL1811081T3 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI61056C (fi) 1981-01-26 1982-05-10 Ahlstroem Oy Daempningssystem foer en inloppslaoda i en pappersmaskin
DE10140416A1 (de) * 2001-08-17 2003-02-27 Voith Paper Patent Gmbh Stoffauflauf

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Publication number Publication date
ATE503885T1 (de) 2011-04-15
DE102006002788A1 (de) 2007-07-26
EP1811081A3 (fr) 2009-12-23
PL1811081T3 (pl) 2011-09-30
EP1811081A2 (fr) 2007-07-25
DE502006009202D1 (de) 2011-05-12

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