EP2352879A2 - Caisse de tête bicouches pour une machine de fabrication d'une bande bicouches de matière fibreuse - Google Patents

Caisse de tête bicouches pour une machine de fabrication d'une bande bicouches de matière fibreuse

Info

Publication number
EP2352879A2
EP2352879A2 EP09736232A EP09736232A EP2352879A2 EP 2352879 A2 EP2352879 A2 EP 2352879A2 EP 09736232 A EP09736232 A EP 09736232A EP 09736232 A EP09736232 A EP 09736232A EP 2352879 A2 EP2352879 A2 EP 2352879A2
Authority
EP
European Patent Office
Prior art keywords
separating wedge
wedge
separating
upstream
downstream
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.)
Withdrawn
Application number
EP09736232A
Other languages
German (de)
English (en)
Inventor
Markus Häußler
Konstantin Fenkl
Wolfgang Ruf
Mathias Schwaner
Jürgen Prössl
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 EP2352879A2 publication Critical patent/EP2352879A2/fr
Withdrawn legal-status Critical Current

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
    • D21F1/028—Details of the nozzle section

Definitions

  • the invention relates to a two-layer casserole for a machine for producing a two-ply fibrous web, in particular a two-ply paper or board web, from two pulp suspensions, with a headbox nozzle, the two extending across the width, inside separated by a separating wedge, during operation of the two-layer casserole each having a pulp suspension as a pulp suspension flow leading and converging nozzle chambers having upstream each one feeder, downstream each having a width extending across the gap gap gap and on the outside each having an outer wall, wherein the separating wedge two during operation of the Zweichivierstoffauflaufs of the respective pulp suspension stream Has touched separating wedge surfaces.
  • the two pulp suspensions will usually be suspensions of different pulps; but it can also be suspensions with the same fibrous materials, but with different physical properties.
  • a physical property for example, different pressures for setting different flow velocities in the respective
  • Such a two-layer casserole is known for example from German Patent DE 43 23 050 C1.
  • the disclosed two-layer casserole For separation of two adjacent pulp suspension streams in the headbox, a continuously tapered separating wedge is provided, which is articulated in the headbox by means of an articulating unit located upstream.
  • the separating wedge of the two-layer casserole according to the invention affords the advantage that the layer purity in the height direction can be markedly improved compared with known multi-layer casseroles. This is primarily due to the fact that the angle of incidence of the two pulp suspension streams is significantly reduced when they are merged at the separating wedge end. Associated with this is a reduction of the turbulences forming in the pulp suspension streams with a concomitant improvement in the layer purity in the height direction.
  • the turbulences forming in the two pulp suspension streams also affect the coverage qualities of the two pulp suspension layers to a significant degree. Now, if the turbulence is reduced, so also reduce the mixing zones within the
  • Pulp suspension jet in its height direction (z-direction). And these reduced mixing zones in turn contribute significantly to improved coverage qualities of the two pulp suspension layers.
  • the separating wedge may in this case consist of a stainless steel or the like and have a minimum rigidity both in the longitudinal direction and in the transverse direction, which assumes at least a value of> 40 N / mm in some areas.
  • the separating wedge is preferably rigidly arranged by means of an upstream wedge retainer, that is to say it is not hinged and thus not freely movable in the headbox nozzle.
  • a straight line which is preferably aligned centrally in the longitudinal direction runs through the upstream separating wedge receptacle.
  • the lamella can consist of a plastic, preferably a high-performance polymer such as in particular PPSU, PPS, PEI, PTFE, PA, POM or the like. And depending on the application, the reaching into the region of the nozzle end fin in its structureless end - seen in the flow direction of the pulp suspension flow - a blunt end of lamella with a height of less than 0.4 mm, preferably smaller than 0.3 mm, or in their structured End region - in the flow direction of
  • Seen pulp suspension stream - have a dull lamellar end with a height of greater than 0.5 mm.
  • the structured end region can have the structure of grooves with a rectangular and / or wedge-shaped and / or parabolic and / or round shape with a constant and / or different depth.
  • the two-layer casserole according to the invention can moreover be combined with a sectioned consistency control (dilution water technology,
  • ModuleJet as it is known for example from the document DE 40 19 593 C2, be provided.
  • a non-planar transition region between the two separating wedge areas of the separating wedge is provided on both separating wedge surfaces of the separating wedge.
  • At least the upstream separating wedge initial region of the separating wedge can be aligned symmetrically with respect to a straight line running through the upstream separating wedge holder. Is in this case the downstream
  • both the upstream breaker wedge start region of the breaker wedge and the downstream breaker wedge end region of the breaker wedge may be symmetrically aligned with a straight line passing through the upstream breaker wedge so that the breaker tip of the breaker wedge lies on the straight line passing through the upstream breaker wedge retainer.
  • the separating wedge in this case is then designed symmetrically to the straight line passing through the upstream separating wedge holder.
  • a non-planar transition region is provided on a separating wedge surface of the separating wedge between the two separating wedge regions of the separating wedge, and on the other separating wedge surface of the separating wedge, a planar transition region is provided between the two separating wedge regions of the separating wedge.
  • the separating wedge thus forms a flat surface on one side, so that the noticeably reduced angle of incidence of the two pulp suspension flows at their Merging must be worn on the separating wedge end of the other side of the separating wedge.
  • At least the upstream separating wedge initial region of the separating wedge can be aligned symmetrically with respect to a straight line running through the upstream separating wedge holder. Is in this case the downstream
  • both the upstream breaker wedge start region of the breaker wedge and the downstream breaker wedge end region of the breaker wedge may be oriented asymmetrically with respect to a straight line passing through the upstream breaker wedge retainer.
  • the separating wedge tip of the separating wedge could then lie on the straight line passing through the upstream separating wedge holder.
  • the separating wedge end angle of the downstream separating wedge end region has an angular value in the range of 1.5 to 8 °, preferably 2.5 to 4.5 °. In addition, these angular ranges avoid adverse mixing of the two adjacent pulp suspensions.
  • the Trennkeil gardeningswinkel the upstream Trennkeil gardenings Schemes in this case preferably has an angle value in the range of 8 to 20 °, preferably from 10 to 15 °, so that a sufficient rigidity of the separating wedge is given both in the longitudinal direction and in the transverse direction.
  • downstream Separating wedge end portion of the separating wedge has a downstream Trennkeilendin in the range of 10 to 100 mm, preferably from 15 to 75 mm, in particular from 25 to 50 mm, and / or the downstream Trennkeilend Scheme the separating wedge protrudes beyond the outlet gap of the headbox nozzle, preferably in a range of 10 up to 25 mm.
  • the respective non-planar transition region on the separating wedge surface between the two separating wedge regions of the separating wedge may be geometrically angular or round with a radius of curvature in the range from 20 to 1000 mm, preferably from 100 to 500 mm, in particular from 150 to 250 mm.
  • the two pulp suspension streams emerging from the headbox nozzle as a common pulp suspension jet can also have different jet speeds.
  • the at least one difference in the two jet velocities can assume a value in the range from 10 to 60 m / min, preferably from 15 to 25 m / min. This significantly reduces the spread of the mixing cone in the pulp suspension jet to the relevant pulp suspension layer. These requirements may also be dependent on the former concept in a known manner.
  • Two-layer casserole is provided in a further embodiment with a known from a variety of publications dilution water control.
  • a regulated feed stream in particular a dilution water stream, can be fed to at least one pulp suspension with a mixed concentration when a mixed stream is produced.
  • the two-layer bake according to the invention can also be used in an outstanding manner in a machine for producing a two-layer fibrous web, in particular a two-layered paper or board web, from two fibrous stock suspensions.
  • Figure 1 is a schematic longitudinal sectional view of an embodiment of a headbox of a Zweilichtstoffauflaufs invention
  • Figures 2 and 3 are schematic side views of two others
  • FIG. 1 shows a schematic longitudinal section of an embodiment of a headbox nozzle 2 of a two-layer headbox 1.
  • the illustrated two-layer headbox 1 is a component of a machine, not shown, for producing a two-layer fibrous web 3, in particular a two-layered paper or board web, from two fibrous stock suspensions 4.1, 4.2.
  • the pulp suspensions 4.1, 4.2 will usually be suspensions with different pulps; but it can also be suspensions with the same fibrous materials, but with different physical properties.
  • the headbox 2 has two across the width B (arrow) extending, inside by a separating wedge 5 separated, during operation of the two-layer casserole 1 each a pulp suspension 4.1, 4.2 as pulp suspension stream 6.1 (arrow), 6.2 (arrow) leading and converging Nozzle spaces 7.1, 7.2 on.
  • the two nozzle chambers 7.1, 7.2 have the same cross-sectional characteristics.
  • each nozzle chamber 7.1, 7.2 each upstream of a feed device 8.1, 8.2, not shown in detail, each downstream over the width B (arrow) extending outlet gap 9.1, 9.2 with a gap width s9.1, s9.2 and on the outside each have an outer wall 10.1, 10.2.
  • the gap widths s9.1, s9.2 of the exit gaps 9.1, 9.2 are the same size in the illustrated embodiment; however, they can be different in size.
  • the separating wedge 5 consists of a stainless steel or the like and has a minimum rigidity both in the longitudinal direction and in the transverse direction, which assumes at least a value of> 40 N / mm in some areas. Moreover, the separating wedge 5 in the present embodiment by means of an upstream mounted wedge recording 11 rigid, so not articulated and thus not freely movable in the headbox 2 is arranged. By virtue of the upstream separating wedge holder 11, by definition, a straight line G, which is preferably aligned centrally in its longitudinal direction, runs.
  • the separating wedge 5 consists of two separating wedge areas, each having a separating wedge angle .alpha., .Beta., An upstream one Trennkeil gardenings Colour 5.1 and a downstream Trennkeilend Scheme 5.2.
  • the two separating wedge angles ⁇ , ⁇ of the two separating wedge regions 5.1, 5.2 assume different angle values, the separating wedge starting angle ⁇ of the upstream separating wedge starting region 5.1 assuming a larger angle value than the separating wedge final angle ⁇ of the downstream separating wedge end region 5.2.
  • a non-planar transition region 12.0 between the two separating wedge areas 5.1, 5.2, of the separating wedge 5 is provided between at least one separating wedge surface 5.0 of the separating wedge 5.
  • a non-planar transitional area 12.0, 12.U between the two separating wedge areas 5.1, 5.2 of the separating wedge 5 is provided on both separating wedge surfaces 5.O, 5.U of the separating wedge 5.
  • both the upstream separating wedge initial region 5.1 of the separating wedge 5 and the downstream separating wedge end region 5.2 of the separating wedge 5 are aligned symmetrically with respect to a straight line G passing through the upstream separating wedge holder 11, so that the separating wedge tip 13 of the separating wedge 5 on the straight line G passing through the upstream separating wedge holder 11 lies.
  • only the upstream separating wedge initial region of the separating wedge can be aligned symmetrically to a straight line running through the upstream separating wedge receptacle. Moreover, if the downstream spline end region of the splitter is aligned asymmetrically with the straight line passing through the upstream spline retainer, the splitter tip of the splitter does not lie on the straight line passing through the upstream spline retainer.
  • Trennkeil gardenings 5.1 an angle value in the range of 8 to 20 °, preferably from 10 to 15 ° on.
  • Separating wedge end 5.2 has an angular value in the range of 1, 5 bis 8 °, preferably from 2.5 to 4.5 °, so that it is smaller than the Trennkeil gardeningswinkel ⁇ of the upstream Trennkeil gardenings Symposiums 5.1.
  • the downstream Trennkeilend Scheme 5.2 of the separating wedge 5 has a downstream Trennkeilendide I5.2 in the range of 10 to 100 mm, preferably from 15 to 75 mm, in particular from 25 to 50 mm, and he projects beyond the exit slit 9 of the headbox 2, preferably in a range of 10 to 25 mm.
  • the respective non-planar transition region 12.O, 12.U at the corresponding separating wedge surface 5.O, 5.U between the two separating wedge regions 5.1, 5.2 of the separating wedge 5 is round with a rounding radius R5.O, R5.U in the range of 20 to 1000 mm, preferably from 100 to 500 mm, in particular from 150 to 250 mm, designed.
  • the single non-planar transition region on the separating wedge surface between the two separating wedge regions of the separating wedge could also be designed geometrically angular.
  • At least one nozzle space 7.1, 7.2 of the headbox nozzle 2 of the two-layer headbox 1 is provided with at least one lamella 15 extending in the flow direction S (arrow) of the pulp suspension stream 6.1 (arrow), 6.2 (arrow) be.
  • the lamella 15 may consist of a plastic, preferably a high-performance polymer such as in particular PPSU, PPS, PEI, PTFE, PA, POM or the like.
  • the structured end region 16 can, in a further configuration, be the structure of grooves with a rectangular and / or wedge-shaped and / or parabolic and / or round shape with a constant and / or different shape Have depth.
  • two lamellae 15 are arranged in each nozzle chamber 7.1, 7.2, which have a purely exemplary and thus not restricting the same lamellae lengths (nozzle chamber 7.1) and different lamellae lengths (nozzle chamber 7.2).
  • the two-layer casserole 1 according to the invention can also be provided with a sectioned consistency control (dilution-water technology, "ModuleJet") in a manner not shown to those skilled in the art
  • a sectioned consistency control diilution-water technology, "ModuleJet”
  • Such a substance density control for a headbox is known, for example, from the document DE 40 19 593 C2.
  • FIGS. 2 and 3 show schematic side views of two further embodiments of separating wedges 5 of the invention Zweichichtenstoffaufêtn.
  • a non-planar transitional area 12.0 between the two separating wedge areas 5.1, 5.2 of the separating wedge 5 is provided only at a separating wedge surface 5.0 of the separating wedge 5.
  • a planar transition region 12.U that is to say no change in geometry between the two separating wedge regions 5.1, 5.2, of the separating wedge 5 is provided.
  • the upstream separating wedge initial region 5.1 of the separating wedge 5 is aligned symmetrically with respect to a straight line G passing through the upstream separating wedge holder 11, the straight line G being defined as already described above.
  • the downstream separating wedge end region 5.2 of the separating wedge 5 is oriented asymmetrically with respect to the straight line G passing through the upstream separating wedge retainer 11, the separating wedge tip 13 of the separating wedge 5 does not lie on the straight line G passing through the upstream separating wedge retainer 11.
  • both the upstream breaker wedge start region 5.1 of the breaker wedge 5 and the downstream breaker wedge end region 5.2 of the breaker wedge 5 are aligned asymmetrically with a straight line G passing through the upstream breaker wedge retainer, the straight line G being as previously defined.
  • the separating wedge tip 13 of the separating wedge 5 lies on the straight line G passing through the upstream separating wedge holder 11. But it could also be wrong.
  • the respective Trennkeil gardeningswinkel ⁇ of the upstream Trennkeil gardenings Surrey 5.1 turn an angle value in the range of 8 to 20 °, preferably from 10 to 15 °, on.
  • the respective Trennkeilendwinkel ß of the downstream Trennkeilend Schemes 5.2 again has an angular value in the range of 1, 5 to 8 °, preferably from 2.5 to 4.5 °, so that it is smaller than the Trennkeilsweepingswinkel ⁇ of the upstream Trennkeilsweepings 5.1.
  • the downstream Trennkeilend Scheme 5.2 of the respective separating wedge 5 has a downstream Trennkeilendide I5.2 in the range of 10 to 100 mm, preferably from 15 to 75 mm, in particular from 25 to 50 mm.
  • the non-planar transition region 12.0 shown in each of FIGS. 2 and 3 is geometrically angular on the separating wedge surface 5.0 between the two separating wedge regions 5.1, 5.2 of the individual separating wedge 5.
  • the transition extends in the transverse direction of the separating wedge 5, ie along a line L.
  • the respective non-planar transition region could also be designed round with a corresponding radius of curvature.
  • the pulp suspension streams 6.1, 6.2 emerging from the headbox nozzle 2 as a common pulp suspension jet 14 can have different jet velocities v6.1 (arrow), v6.2 (arrow).
  • the difference in the jet velocities v6.1 (arrow), v6.2 (arrow) in particular assumes a value in the range from 10 to 60 m / min, preferably from 15 to 25 m / min.
  • At least one pulp suspension, a controlled feed stream, in particular a dilution water stream when generating a mixed stream with a mixed concentration be fed. This makes it possible to control both the fiber orientation transverse profile and the basis weight transverse profile of the two-layer fibrous web.
  • the illustrated in Figures 1 to 3 or indicated two-layer casserole 1 is particularly suitable for use in a machine for producing a two-layer fibrous web 3, in particular a two-ply paper or board web, from two pulp suspensions 4.1, 4.2.
  • the invention provides a two-layer casserole of the type mentioned in the introduction, which makes it possible to achieve both a high-grade layer purity in the height direction and a good optical cover quality of the two fiber suspension layers in a fibrous web produced therewith. This is also made possible, in particular, in the production of a two-layer fibrous web having a weight per unit area in the range from 20 to 60 g / m 2 per pulp suspension layer at a production speed of over 900 m / min. LIST OF REFERENCE NUMBERS

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  • Paper (AREA)

Abstract

L'invention porte sur une caisse de tête bicouches (1) pour une machine de fabrication d'une bande de matière fibreuse bicouches (3), en particulier d'une bande de papier ou de carton bicouches, à partir de deux suspensions de matière fibreuse (4.1, 4.2). La caisse de tête comporte une buse (2) de caisse de tête, qui présente deux compartiments de buse (7.1, 7.2), dirigés l'un vers l'autre, s'étendant sur toute la largeur (B), séparés l'un de l'autre sur la face intérieure par une cale de séparation (5) et, pendant la marche de la caisse de tête bicouches (1), faisant passer chacun une suspension de matière fibreuse (4.1, 4.2) sous forme d'un courant de suspension de matière fibreuse (6.1, 6.2). Chacun des compartiments de buse comprend en amont un dispositif d'amenée (8.1, 8.2), en aval une fente de sortie (9.1, 9.2) s'étendant sur toute la largeur (B) et ayant une largeur de fente (s9.1, s9.2), et du côté extérieur une paroi extérieure (10.1, 10.2), la cale de séparation (5) comportant deux surfaces de cale de séparation (5.0, 5.U), qui pendant la marche de la caisse de tête bicouches (1) entrent en contact avec chacun des courants de suspension de matière fibreuse (6.1, 6.2). La caisse de tête bicouches (1) selon l'invention est caractérisée en ce que la cale de séparation (5) est constituée de deux zones de cale de séparation, présentant chacune un angle de cale de séparation (a, ß), d'une zone initiale (5.1) de cale de séparation en amont, et d'une zone terminale de cale de séparation (5.2) en aval; que les deux angles de cale de séparation (a, ß) des deux zones de cale de séparation (5.1, 5.2) ont des valeurs différentes, l'angle initial (a) de cale de séparation de la zone initiale (5.1) de cale de séparation amont ayant une valeur plus grande que l'angle terminal (ß) de cale de séparation de la zone de cale de séparation (5.2) aval; et qu'entre au moins une surface de cale de séparation (5.0; 5.0, 5.U) de la cale de séparation (5), il est prévu une zone de transition non plane (12.0; 12.0, 12.U) entre les deux zones (5.1, 5.2) de la cale de séparation (5).
EP09736232A 2008-10-24 2009-10-16 Caisse de tête bicouches pour une machine de fabrication d'une bande bicouches de matière fibreuse Withdrawn EP2352879A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008043145A DE102008043145A1 (de) 2008-10-24 2008-10-24 Zweischichtenstoffauflauf für eine Maschine zur Herstellung einer zweischichtigen Faserstoffbahn
PCT/EP2009/063549 WO2010046312A2 (fr) 2008-10-24 2009-10-16 Caisse de tête bicouches pour une machine de fabrication d'une bande bicouches de matière fibreuse

Publications (1)

Publication Number Publication Date
EP2352879A2 true EP2352879A2 (fr) 2011-08-10

Family

ID=42054845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09736232A Withdrawn EP2352879A2 (fr) 2008-10-24 2009-10-16 Caisse de tête bicouches pour une machine de fabrication d'une bande bicouches de matière fibreuse

Country Status (5)

Country Link
US (1) US20110259540A1 (fr)
EP (1) EP2352879A2 (fr)
CN (1) CN102257214A (fr)
DE (1) DE102008043145A1 (fr)
WO (1) WO2010046312A2 (fr)

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DE102008054897A1 (de) 2008-12-18 2010-07-01 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008054896A1 (de) 2008-12-18 2010-07-01 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008054898A1 (de) 2008-12-18 2010-06-24 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
WO2013159298A1 (fr) * 2012-04-25 2013-10-31 广州华创化工材料科技开发有限公司 Matériau de filtre à air autonettoyant et procédé de préparation correspondant
CN103046418A (zh) * 2012-12-20 2013-04-17 华南理工大学 一种新月型双层流浆箱
CN104611980A (zh) * 2015-01-28 2015-05-13 联盛纸业（龙海）有限公司 一种高强内结合力箱板纸生产方法
CN105442375A (zh) * 2015-12-10 2016-03-30 周妙思 一种新型流浆箱
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Also Published As

Publication number Publication date
DE102008043145A1 (de) 2010-04-29
CN102257214A (zh) 2011-11-23
US20110259540A1 (en) 2011-10-27
WO2010046312A3 (fr) 2011-08-18
WO2010046312A2 (fr) 2010-04-29

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