EP1811081A2 - 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
EP1811081A2
EP1811081A2 EP06124863A EP06124863A EP1811081A2 EP 1811081 A2 EP1811081 A2 EP 1811081A2 EP 06124863 A EP06124863 A EP 06124863A EP 06124863 A EP06124863 A EP 06124863A EP 1811081 A2 EP1811081 A2 EP 1811081A2
Authority
EP
European Patent Office
Prior art keywords
headbox
flow channels
pulp suspension
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.)
Granted
Application number
EP06124863A
Other languages
German (de)
English (en)
Other versions
EP1811081A3 (fr
EP1811081B1 (fr
Inventor
Wolfgang Ruf
Klaus Lehleiter
Karl Bunz
Konstantin Fenkl
Hans Loser
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
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
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21F1/026—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 is merged after exiting the turbulence generating means in a preferably machine-width chamber, wherein the respective outlet side has a flat, formed by the end of the respective flow channel outlet surface.
  • Such a headbox is for example from the German Offenlegungsschrift DE 31 42 292 A1 known.
  • the flow channels of the turbulence generating means have either circular or polygonal cross-sectional areas.
  • the polygonal cross-sectional areas may assume a rectangular, in particular a square, or a hexagonal shape.
  • All of the forms presented here have at least one same property: they have vertical webs or portions of vertical walls. It has now been shown in practice that this property generates a lattice tracking flow in the at least one pulp suspension, which has a negative effect on the properties of the fibrous web to be produced.
  • the aforementioned causes Property also demixing effects in the at least one pulp suspension. The demixing effects occur here in particular in a Unterlastsituation in the headbox in appearance.
  • the lattice tracking flow and any segregation effects should be kept to a minimum.
  • the outlet surfaces of the flow channels are each formed of a polygon sides having a plurality of polygon having at least two inner angle, which are smaller than 90 °, in particular less than 75 °, and that all polygon sides of the respective polygon of the Perpendicular to the turbulence generating means are aligned differently.
  • the vertical of the turbulence generating means is aligned by definition orthogonal to the cross machine direction (CD direction); it thus 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 of a machine for producing a fibrous web, in particular a paper or board web, from a pulp suspension 2.
  • the illustrated headboxes 1 can of course also be configured as multilayer headboxes comprising at least two different pulp suspensions for producing a fibrous web use.
  • the fibrous web may in particular be a paper, board or tissue web.
  • the headbox 1 shown in FIG. 1a has a feed device 3 which feeds the pulp suspension 2, for example in the embodiment of an illustrated transverse distributor tube 4 or a rotary distributor (not illustrated) with a large number of tubes.
  • 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 rows Z.1 to Z.4 and in columns S ( Figure 2) arranged and only schematically shown flow channels 6 ( Figure 2).
  • 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 traversed by the pulp suspension 2, wherein they divided into turbulent pulp suspension partial streams 7 ( Figure 2) and after emerging from the turbulence generator 5 in a 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 headbox 1 shown in FIG. 1b corresponds at least in the second part of the flow path of the pulp suspension 2 to the headbox shown in FIG. 1a. Thus, reference is hereby made to its description.
  • the headbox 1 of FIG. 1b has both a tube bank 9 (further turbulence generating means) as a feed device 3 feeding the pulp suspension 2 and the turbulence generator 5 and in the flow direction R (arrow) of the pulp suspension 2 preferably machine-width 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 ( Figure 2) arranged and only schematically shown flow channels 6 ( Figure 2).
  • 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, being divided into turbulent pulp suspension partial streams 7 (FIG. 2) and brought together again after leaving the tube bank 9 in the preferably machine-wide chamber 10.
  • the turbulence generator 5 arranged downstream of the preferably machine-width chamber 10 in the flow direction R (arrow) of the pulp suspension 2 may be similar or even identical to the turbulence generator 5 shown in FIG. 1a.
  • the respective headbox 1 illustrated in both FIGS. 1a and 1b can have both a straight base contour (FIG. 1a) and a curved base contour (FIG. 1b).
  • the flow channels 6 of the turbulence generating means 5, 9 shown in both FIGS. 1a and 1b 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. 1 a and 1 b against the flow direction R (arrow) of the pulp suspension 2.
  • each turbulence generating means 5, 9 a vertical A (double arrow), which is aligned by definition orthogonal to the cross-machine direction (CD direction), so 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 formed of a polygon 15.1 to 15.3 ( Figures 2 to 4 and 6), 15.1 to 15.4 ( Figure 5) having polygon 15 having at least two internal angles ⁇ , ⁇ , which is smaller than 90 ° , in particular less 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 oriented differently from the perpendicular 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 indicated for the sake of clarity only for a corresponding outlet surface 13 of at least one flow channel 6.
  • all the 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 of at least two adjacent rows Z are arranged mirror-inverted relative to one another.
  • the mirror axis 17 is formed by a line.
  • they are rectified and offset, preferably arranged in half offset from one another.
  • the flow channels 6 of at least two adjacent rows Z are arranged rectilinearly relative to 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 quadrilaterals 21 are formed of kite quadrilaterals 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 another 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 is a known to those skilled blade 24 ( Figures 1a and 1b).
  • 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.
  • flow channels 6 corresponds to the embodiment of Figure 2. It is understood that the embodiments of Figures 3 and 4 can find their appropriate use.
  • the headbox 1 shown in the figures, in particular in Figures 2 to 6 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)
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 true EP1811081A2 (fr) 2007-07-25
EP1811081A3 EP1811081A3 (fr) 2009-12-23
EP1811081B1 EP1811081B1 (fr) 2011-03-30

Family

ID=38123336

Family Applications (1)

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

Country Status (4)

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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3142292A1 (de) 1981-01-26 1982-08-12 A. Ahlström Oy, 29600 Noormarkku "daempfungssystem fuer den stoffauflauf von papiermaschinen"
DE10140416A1 (de) 2001-08-17 2003-02-27 Voith Paper Patent Gmbh Stoffauflauf

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3142292A1 (de) 1981-01-26 1982-08-12 A. Ahlström Oy, 29600 Noormarkku "daempfungssystem fuer den stoffauflauf von papiermaschinen"
DE10140416A1 (de) 2001-08-17 2003-02-27 Voith Paper Patent Gmbh Stoffauflauf

Also Published As

Publication number Publication date
DE502006009202D1 (de) 2011-05-12
EP1811081A3 (fr) 2009-12-23
EP1811081B1 (fr) 2011-03-30
ATE503885T1 (de) 2011-04-15
DE102006002788A1 (de) 2007-07-26
PL1811081T3 (pl) 2011-09-30

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