US20110259540A1 - Double-layer headbox for a machine for producing a double-layer fibrous web - Google Patents

Double-layer headbox for a machine for producing a double-layer fibrous web Download PDF

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Publication number
US20110259540A1
US20110259540A1 US13/090,794 US201113090794A US2011259540A1 US 20110259540 A1 US20110259540 A1 US 20110259540A1 US 201113090794 A US201113090794 A US 201113090794A US 2011259540 A1 US2011259540 A1 US 2011259540A1
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United States
Prior art keywords
separating wedge
double
separating
wedge
upstream
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Abandoned
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US13/090,794
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English (en)
Inventor
Markus Häussler
Konstantin Fenkl
Ruf Wolfgang
Mathias Schwaner
Jürgen Prössl
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Voith Patent GmbH
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Voith Patent GmbH
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Assigned to VOITH PATENT GMBH reassignment VOITH PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FENKL, KONSTANTIN, HAUSSLER, MARKUS, PROSSL, JURGEN, RUF, WOLFGANG, SCHWANER, MATHIAS
Publication of US20110259540A1 publication Critical patent/US20110259540A1/en
Abandoned legal-status Critical Current

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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
    • D21F1/028—Details of the nozzle section

Definitions

  • the invention relates to a double-layer headbox for a machine for producing a double-layer fibrous web, in particular a double-layer paper or cardboard web produced from two fibrous suspensions, with one headbox nozzle comprising two converging nozzle chambers extending across the width and separated from each other on the inside by a separating wedge, each respectively guiding one fibrous suspension in the form of a fibrous suspension stream during operation of the double-layer headbox, each of said nozzle chambers comprising one upstream feed device, one downstream outlet gap with a gap width, said gap extending across the width and an outer wall on the outside, whereby the separating wedge comprises two separating wedge surfaces which are contacted by the respective fibrous suspension stream during operation of the double-layer headbox.
  • the two fibrous suspensions will be suspensions of different fiber stocks; they may however also be suspensions comprised of the same fiber stocks, whereby however different physical properties are present.
  • a physical property could for example be different pressures controlling of different flow speeds in the respective fibrous suspension.
  • a double-layer headbox of this type is known for example from the German patent document DE 43 23 050 C1.
  • the disclosed double-layer headbox is equipped in the headbox nozzle with a continuously tapered separating wedge which is arranged movable in the headbox nozzle by means of an upstream linked element.
  • double-layer headboxes are currently employed in the packaging machinery field for the production of test liner. Increasing production speeds, as well as increasing raw material and energy costs increasingly demand the production of double-layer products with lower base weights. To this end the double-layer headboxes are operated with ever smaller gap widths, or fibrous suspension stream thicknesses respectively. However, this increases the demands upon stream stability, as well as on turbulence quality of the respective fibrous suspension stream emerging from the headbox nozzle of the double-layer headbox for the purpose of decreasing the mixing zone within the fibrous suspension stream in its height direction (z-direction).
  • the present invention provides, a double-layer headbox of the type referred to at the beginning in that the separating wedge comprises two separating wedge areas, each having a separating wedge angle, an upstream separating wedge starting area and a downstream separating wedge end area, that the two separating wedge angles of the two separating wedge areas assume different angular values, wherein the separating wedge starting angle of the upstream separating wedge starting area assumes a greater angular value than the separating wedge end angle of the downstream separating wedge end area, and that a non-planar transition area is provided between at least one separating wedge surface of the separating wedge between the two separating wedge areas of the separating wedge.
  • the separating wedge of the inventive double-layer headbox provides the advantage that layer integrity in height direction is clearly improved compared to known multi-layer headboxes.
  • the reason for this is primarily that the angle of impact of the two fibrous suspension streams at their confluence at the separating wedge end is clearly reduced. Combined with this is a reduction of the turbulences which develop in the fibrous suspension streams, resulting in an improvement of the layer integrity in height direction.
  • the turbulences developing in the two fibrous suspension streams also substantially influence the coverage qualities of the two fibrous suspension layers. However, if the turbulences are reduced, then the mixing zones within the fibrous suspension stream also reduce in its height direction (z-direction). These reduced mixing zones in turn substantially contribute to the improvement of the coverage qualities of the two fibrous stock layers.
  • the separating wedge may consist of a special steel or similar material and in areas have a minimum strength in longitudinal as well as in cross direction of a value of ⁇ 40 N/mm.
  • the separating wedge is mounted rigidly, preferably by means of an upstream separating wedge retainer; in other words it is not joint and therefore not mounted freely movable in the headbox nozzle.
  • a straight line extends in longitudinal direction, preferably centered through the upstream separating wedge retainer.
  • the lamella may consist of a synthetic material, preferably a high performance polymer, especially PPSU, PPS, PEI, PTFE, PA, POM or similar.
  • the lamella which reaches into the area of the nozzle end can have a blunt lamella end at its non-structured end area with a height of less than 0.4 mm, preferably less than 0.3 mm, viewed in flow direction of the fibrous suspension stream, or, in its structured end area, viewed in flow direction of the fibrous suspension stream, a blunt lamella end with a height greater than 0.5 mm.
  • the structured end area may take the structure of grooves with rectangular and/or wedge shaped and/or parabolic and/or round form with a constant and/or different depth.
  • the inventive double-layer headbox can additionally be equipped with a sectionalized stock consistency control (Dilution Water-Technology, “ModuleJet”) as known for example from publication DE 40 19 593 C2.
  • a non-planar transition area is provided respectively on both separating wedge surfaces of the separating wedge between the two separating wedge areas of the separating wedge.
  • At least the upstream separating wedge starting area of the separating wedge can be aligned symmetrically with one straight line extending through the upstream separating wedge retainer. If in this case the downstream separating wedge end area of the separating wedge is aligned asymmetrically with a straight line extending through the upstream separating wedge retainer, then the separating wedge tip of the separating wedge is not positioned on the straight line extending through the upstream separating wedge retainer.
  • the upstream separating wedge starting area of the separating wedge, as well as the downstream separating wedge end area of the separating wedge can be aligned symmetrically with a straight line extending through the upstream separating wedge retainer, so that the separating wedge tip of the separating wedge is positioned on the straight line extending through the upstream separating wedge retainer.
  • the separating wedge is symmetric with the straight line extending through the upstream separating wedge retainer.
  • a non-planar transition area is provided on one separating wedge surface of the separating wedge between the two separating wedge areas of the separating wedge, and a planar transition area is provided on the other separating wedge surface of the separating wedge between the two separating wedge areas of the separating wedge.
  • the separating wedge therefore forms a planar area on one side so that the distinctly reduced angle of impact of the two fibrous suspension streams when coming together at the separating wedge end must be supported by the other side of the separating wedge.
  • At least the upstream separating wedge starting area of the separating wedge can be aligned symmetrically with one straight line extending through the upstream separating wedge retainer. If in this case the downstream separating wedge end area of the separating wedge is aligned asymmetrically with a straight line extending through the upstream separating wedge retainer, then the separating wedge tip of the separating wedge is not positioned on the straight line extending through the upstream separating wedge retainer.
  • the upstream separating wedge starting area of the separating wedge, as well as the downstream separating wedge end area of the separating wedge can be aligned asymmetrically to a straight line extending through the upstream separating wedge retainer.
  • the separating wedge tip of the separation edge could be positioned on the straight line extending through the upstream separating wedge retainer.
  • the separating wedge end angle of the downstream separating wedge end area has an angular value in the range of 1.5 to 8°, preferably 2.5 to 4.5°. Additionally, these angle areas avoid disadvantageous mixing of the two adjacent fibrous suspensions.
  • the separating wedge starting angle of the upstream separating wedge starting area preferably has an angular value in the range of 8° to 20°, preferably 10 to 15°, so that sufficient rigidity of the separating wedge is provided in longitudinal direction, as well as in cross direction.
  • downstream separating wedge end area of the separating wedge has a downstream separating wedge end length in the range of 10 to 100 mm, preferably 15 to 75 mm, especially 25 to 50 mm and/or the downstream separating wedge end area of the separating wedge protrudes beyond the outlet gap of the headbox nozzle, preferably in a range of 10 to 25 mm.
  • the respective non-planar transition area at the separating wedge surface between the two separating wedge areas of the separating wedge can moreover also be angular or round with a radius in the range of 20 to 1000 mm, preferably 100 to 500 mm, especially 150 to 250 mm.
  • the two fibrous suspension streams emerging from the headbox nozzle as one combined fibrous suspension stream can moreover have different stream speeds.
  • the at least one difference in the two stream speeds can assume a value in the range of 10 to 60 m/min, preferably 15 to 25 m/min. This substantially reduces spreading of the mixing cone in the fibrous suspension stream to the relevant fibrous suspension layer.
  • the double-layer headbox in an additional embodiment is equipped with dilution water controls which are already known from many publications.
  • One controlled supply stream, especially a dilution water stream is to be added to at least one fibrous suspension when producing a mixed stream with a mixed concentration.
  • the inventive double-layer headbox can also be used in an excellent manner in a machine for the production of a double-layer fibrous web, especially a double-layer paper or cardboard web consisting of two fibrous suspensions.
  • FIG. 1 is a schematic longitudinal section of one design form of a headbox nozzle in an inventive double-layer headbox
  • FIGS. 2 and 3 are schematic side views of two additional design forms of separating wedges for inventive double-layer headboxes.
  • FIG. 1 illustrates a schematic longitudinal sectional view of one design form of a headbox nozzle 2 of double-layer headbox 1 .
  • the illustrated double-layer headbox 1 is part of a machine which is not depicted in closer detail, for the production of a double-layer fibrous web 3 , in particular a double-layer paper or cardboard web consisting of two fibrous suspensions 4 . 1 , 4 . 2 .
  • Fibrous suspensions 4 . 1 , 4 . 2 will generally be suspensions with different fiber stocks; they could however be also suspensions of the same fiber sock, whereby however different physical properties exist.
  • Headbox nozzle 2 comprises two converging nozzle chambers 7 . 1 , 7 . 2 extending across the width B (arrow) and separated from each other on the inside by a separating wedge 5 , guiding one respective fibrous suspension 4 . 1 , 4 . 2 in the form of a fibrous suspension stream 6 . 1 (arrow), 6 . 2 (arrow) during operation of double-layer headbox 1 .
  • the two nozzle chambers 7 . 1 , 7 . 2 have the same cross sectional progression.
  • each of said nozzle chambers 7 . 1 , 7 . 2 comprises an upstream feed device 8 . 1 , 8 . 2 which is not illustrated in further detail, a downstream outlet gap 9 . 1 , 9 . 2 with a gap width s 9 . 1 , s 9 . 2 , said gap extending across the width B (arrow) and an outer wall 10 . 1 , 10 . 2 respectively on the outside.
  • Gap widths s 9 . 1 , s 9 . 2 of outlet gap 9 . 1 , 9 . 2 are of the same size in the illustrated example; they can however also be of a different size.
  • the respective feed device 8 . 1 , 8 . 2 which is not illustrated in detail is a turbulence generator located immediately prior to headbox nozzle 2 ; it may however also be located indirectly before the headbox nozzle and/or it may include a preferably machine wide intermediate chamber or a tubular grating
  • Separating wedge 5 consists of a special steel or similar material and has a minimum strength in longitudinal as well as in cross direction of a value of at least ⁇ 40 N/mm.
  • separating wedge 5 in the present example is mounted rigidly by means of an upstream separating wedge retainer 11 ; in other words it is not joint and therefore not mounted movable in headbox nozzle 2 .
  • a straight line G extends in longitudinal direction, preferably centered through the upstream separating wedge retainer 11 .
  • separating wedge 5 consists of two separating wedge areas having a respective separation angle ⁇ , ⁇ , an upstream separating wedge starting area 5 . 1 and a downstream separating wedge end area 5 . 2 .
  • the two separating wedge angles ⁇ , ⁇ of the two separating wedge areas 5 . 1 , 5 . 2 assume different angular values, whereby separating wedge starting angle ⁇ of the upstream separating wedge starting area 5 . 1 assumes a greater angular value than the separating wedge end angle ⁇ of the downstream separating wedge end area 5 . 2 .
  • a non-planar transition area 12 .O is provided between the two separating wedge areas 5 . 1 , 5 . 2 of separating wedge 5 , between at least one separating wedge surface 5 .O of separating wedge 5 .
  • FIG. 1 provides a non-planar transition area 12 .O, 12 .U respectively on the two separating wedge surfaces 5 .O, 5 .U of separating wedge 5 , between the two separating wedge areas 5 . 1 , 5 . 2 of separating wedge 5 .
  • Upstream separating wedge starting area 5 . 1 of separating wedge 5 as well as downstream separating wedge end area 5 . 2 of separating wedge 5 is aligned symmetrically with a straight line G extending through the upstream separating wedge retainer 11 , so that separating wedge tip 13 of separating wedge 5 is positioned on straight line G extending through the upstream separating wedge retainer 11 .
  • An additional embodiment which is not illustrated provides that only the upstream separating wedge starting area of the separating wedge is aligned symmetrically with a straight line extending through the upstream separating wedge retainer. If moreover the downstream separating wedge end area of the separating wedge is aligned asymmetrically with the straight line extending through the upstream separating wedge retainer, then the separating wedge tip of the separating wedge is not positioned on the straight line extending through the upstream separating wedge retainer.
  • separating wedge starting angle ⁇ of upstream separating wedge starting area 5 . 1 has an angular value in the range of 8 to 20°, preferably 10 to 15°.
  • separating wedge end angle ⁇ of downstream separating wedge end area 5 . 2 has an angular value in the range of 1.5 to 8°, preferably 2.5 to 4.5°, so that it is
  • Downstream separating wedge end area 5 . 2 of separating wedge 5 has a downstream separating wedge end length 15 . 2 in the range of 10 to 100 mm, preferably 15 to 75 mm, especially 25 to 50 mm and protrudes beyond outlet gap 9 of headbox nozzle 2 , preferably in a range of 10 to 25 mm.
  • the respective non-planar transition area 12 .O, 12 .U on the appropriate separating wedge surface 5 .O, 5 U between the two separating wedge areas 5 . 1 , 5 . 2 of separating wedge 5 is round with a radius R 5 .O, R 5 .U in the range of 20 to 1000 mm, preferably 100 to 500 mm, especially 150 to 250 mm.
  • the single non-planar transition area at the separating wedge surface between the two separating wedge areas of the separating wedge could also be angular.
  • At least one nozzle chamber 7 . 1 , 7 . 2 of headbox nozzle 2 of double-layer headbox 1 can be equipped with a lamella 15 extending in flow direction S (arrow) of fibrous suspension stream 6 . 1 (arrow), 6 . 2 (arrow).
  • Lamella 15 may consist of a synthetic material, preferably a high performance polymer, especially PPSU, PPS, PEI, PTFE, PA, POM or similar.
  • lamella 15 which reaches into the area of the nozzle end can have a blunt lamella end 17 at its non-structured end area 16 with a height of less than 0.4 mm, preferably less than 0.3 mm, viewed in flow direction S (arrow) of fibrous suspension stream 6 . 1 (arrow), 6 . 2 (arrow), or, in its structured end area 16 , viewed in flow direction S (arrow) of the fibrous suspension stream 16 . 1 (arrow), 16 . 2 (arrow), a blunt lamella end 17 with a height greater than 0.5 mm.
  • the structured end area 16 may take the structure of grooves with rectangular and/or wedge shaped and/or parabolic and/or round form with a constant and/or different depth.
  • each nozzle chamber 7 . 1 , 7 . 2 which, purely as an example, but not limited to, have the same lamella lengths (nozzle chamber 7 . 1 ) and different lamella lengths (nozzle chamber 7 . 2 ).
  • the inventive double-layer headbox 1 can be equipped with a sectionalized stock consistency control (Dilution Water-Technology, “ModuleJet”).
  • a stock density control of this type for a headbox is known for example from publication DE 40 19 593 C2.
  • FIGS. 2 and 3 illustrate a schematic side view of two additional design forms of separating wedges 5 for inventive double-layer headboxes.
  • a non-planar transition area 12 . 0 between the two separating wedge areas 5 . 1 , 5 . 2 of separating wedge 5 is provided on only one separating wedge surface 5 .O of separating wedge 5 .
  • a planar transition area 12 .U is provided—therefore no geometric change between the two separating wedge areas 5 . 1 , 5 . 2 of separating wedge 5 is provided.
  • the upstream separating wedge starting area 5 . 1 of separating wedge 5 is aligned symmetrically with a straight line G extending through the upstream separating wedge retainer 11 , whereby straight line G is defined as previously described. Since however the downstream separating wedge end area 5 . 2 of separating wedge 5 is aligned asymmetrically with straight line G extending through upstream separating wedge retainer 11 , separating wedge tip 13 of separating wedge 5 is not positioned on straight line G extending through upstream separating wedge retainer 11 .
  • upstream separating wedge starting area 5 . 1 of separating wedge 5 as well as downstream separating wedge end area 5 . 2 of separating wedge 5 is aligned asymmetrically with straight line G extending through the upstream separating wedge retainer, whereby straight line G is defined as previously described.
  • this design form provides that separation wedge tip 13 of separating wedge 5 is positioned on straight line G extending through upstream separating wedge retainer 11 . It could however also be positioned next to it.
  • the respective separating wedge starting angle ⁇ of upstream separating wedge starting area 5 . 1 has again an angular value in the range of 8 to 20°, preferably 10 to 15°.
  • Respective separating wedge angle ⁇ of downstream separation end area 5 . 2 again has an angular value in the range of 1.5 to 8°, preferably 2.5 to 4.5°, so that it is smaller than the separating wedge starting angle ⁇ of upstream separating wedge starting area 5 . 1 .
  • Downstream separating wedge end area 5 . 2 of the respective separating wedge 5 has a downstream separating wedge end length 15 . 2 in the range of 10 to 100 mm, preferably 15 to 75 mm, especially 25 to 50 mm.
  • non-planar transition area 12 .O at separating wedge surface 5 .O between the two separating wedge areas 5 . 1 , 5 . 2 of the individual separating wedge 5 illustrated in FIGS. 2 and 3 is geometrically angular.
  • the transition progresses in transverse direction of separating wedge 5 , in other words along a line L.
  • the respective non-planar transition area could also be round with a corresponding radius.
  • fibrous suspension streams 6 . 1 , 6 . 2 emerging from headbox nozzle 2 as a common fibrous suspension stream 14 can have different stream flow speeds v 6 . 1 (arrow), v 6 . 2 (arrow).
  • a controlled stream in particular a dilution water stream can be added to at least one fibrous suspension when producing a mixed stream with a mixing concentration. This allows for control of the fiber orientation cross profile, as well as the base weight profile of the double-layer fibrous web.
  • Double-layer headbox 1 illustrated or respectively indicated in FIGS. 1 through 3 are particularly suitable for utilization in a machine for the production of a double-layer fibrous web 3 , in particular a double-layer paper or cardboard web from two fibrous suspensions 4 . 1 , 4 . 2 .
  • the invention creates a double-layer headbox of the type described at the beginning providing high grade layer integrity in height direction as well as good optical coverage quality of the two fibrous suspension layers in a fibrous web produced by said double-layer headbox.
  • this is also made possible in the production of a double-layer fibrous web with a base weight in the range of 20 to 60 g/m 2 per fibrous suspension layer at a production speed in excess of 900 m/min.

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US13/090,794 2008-10-24 2011-04-20 Double-layer headbox for a machine for producing a double-layer fibrous web Abandoned US20110259540A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008043145.1 2008-10-24
DE102008043145A DE102008043145A1 (de) 2008-10-24 2008-10-24 Zweischichtenstoffauflauf für eine Maschine zur Herstellung einer zweischichtigen Faserstoffbahn
PCT/EP2009/063549 WO2010046312A2 (de) 2008-10-24 2009-10-16 Zweischichtenstoffauflauf für eine maschine zur herstellung einer zweischichtigen faserstoffbahn

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/063549 Continuation WO2010046312A2 (de) 2008-10-24 2009-10-16 Zweischichtenstoffauflauf für eine maschine zur herstellung einer zweischichtigen faserstoffbahn

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US20110259540A1 true US20110259540A1 (en) 2011-10-27

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US13/090,794 Abandoned US20110259540A1 (en) 2008-10-24 2011-04-20 Double-layer headbox for a machine for producing a double-layer fibrous web

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US (1) US20110259540A1 (de)
EP (1) EP2352879A2 (de)
CN (1) CN102257214A (de)
DE (1) DE102008043145A1 (de)
WO (1) WO2010046312A2 (de)

Cited By (3)

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CN103046418A (zh) * 2012-12-20 2013-04-17 华南理工大学 一种新月型双层流浆箱
CN105442375A (zh) * 2015-12-10 2016-03-30 周妙思 一种新型流浆箱
CN105755886A (zh) * 2016-04-29 2016-07-13 华南理工大学 一种调节纸张横幅定量用的稀释水添加装置及方法

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EP2199459A1 (de) 2008-12-16 2010-06-23 Voith Patent GmbH Blattbildungssystem für eine Maschine zur Herstellung einer mehrschichtigen 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
DE102008054897A1 (de) 2008-12-18 2010-07-01 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
US9771904B2 (en) * 2012-04-25 2017-09-26 Fibrway Materials Science & Technology Development Co., Ltd. Self-cleaning air filtering material and preparation method therefor
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
DE102019126296A1 (de) * 2019-09-30 2021-04-01 Voith Patent Gmbh Lamelle für einen Stoffauflauf und Verfahren zur Herstellung einer Lamelle

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US6475345B2 (en) * 1998-02-05 2002-11-05 Andritz-Patentverwaltungs-Gesellschaft M.B.H. Device for feeding a pulp suspension with eccentric shaft adjustment
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Publication number Priority date Publication date Assignee Title
CN103046418A (zh) * 2012-12-20 2013-04-17 华南理工大学 一种新月型双层流浆箱
CN105442375A (zh) * 2015-12-10 2016-03-30 周妙思 一种新型流浆箱
CN105755886A (zh) * 2016-04-29 2016-07-13 华南理工大学 一种调节纸张横幅定量用的稀释水添加装置及方法

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EP2352879A2 (de) 2011-08-10
DE102008043145A1 (de) 2010-04-29
WO2010046312A3 (de) 2011-08-18
CN102257214A (zh) 2011-11-23
WO2010046312A2 (de) 2010-04-29

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