EP2446083A2 - Caisse de tête pour une machine servant à fabriquer une bande de matériau fibreux - Google Patents

Caisse de tête pour une machine servant à fabriquer une bande de matériau fibreux

Info

Publication number
EP2446083A2
EP2446083A2 EP10718128A EP10718128A EP2446083A2 EP 2446083 A2 EP2446083 A2 EP 2446083A2 EP 10718128 A EP10718128 A EP 10718128A EP 10718128 A EP10718128 A EP 10718128A EP 2446083 A2 EP2446083 A2 EP 2446083A2
Authority
EP
European Patent Office
Prior art keywords
headbox
diaphragm
pulp suspension
range
touched
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
EP10718128A
Other languages
German (de)
English (en)
Other versions
EP2446083B1 (fr
Inventor
Wolfgang Ruf
Markus Häußler
Stefan Schlegel
Jens Haessner
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 EP2446083A2 publication Critical patent/EP2446083A2/fr
Application granted granted Critical
Publication of EP2446083B1 publication Critical patent/EP2446083B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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

  • Headbox for a machine for producing a fibrous web
  • the invention relates to a headbox for a machine for producing a fibrous web, in particular a paper, board or tissue web, from at least one pulp suspension, having an upper nozzle wall and a lower nozzle wall and two side walls, tapering to an outlet and one of the pulp suspension during the operation of the headbox with flow direction flowed through interior headbox, wherein on the upper nozzle wall of the headbox on the outlet side by means of several elements slidable and extending across the machine width aperture is arranged, which has a diaphragm board and a diaphragm immersion depth and during operation of the headbox comprises at least two surfaces in contact with a pulp suspension, an upstream ramp surface and a downstream major surface.
  • Such a headbox for a machine for producing a fibrous web, in particular a paper, board or tissue web, from at least one pulp suspension is known for example from German patent application DE 10 2004 047 879 A1.
  • An aperture arranged on the outlet side of a headbox of a headbox is used in a known manner for calibrating the operating nozzle gap and for profiling, in particular for cross-profiling a headbox leaving at least one fibrous suspension Pulp suspension jet used.
  • the goal of this profiling is usually the optimization of the fiber orientation, whereas in the past it was the optimization of the cross-section of the basis weight.
  • the aperture a beam contraction for the at least one pulp suspension comprising pulp suspension jet given, with lower adjustments to the aperture at higher beam contraction effect a greater impact.
  • the jet contraction generally causes alignment of the fibers in the at least one pulp suspension in their flow direction, that is, in the machine direction.
  • This alignment is particularly disadvantageous for those grades where a low MD / CD strength ratio (MD: machine direction; CD: cross machine direction) must be achieved.
  • MD machine direction
  • CD cross machine direction
  • an aperture arranged on the headbox nozzle is completely dispensed with or a regulating flap, that is to say an exchangeable front nozzle part, is provided.
  • a regulating flap that is to say an exchangeable front nozzle part
  • no profiling of the nozzle gap can be made.
  • any production-related inaccuracies can no longer be compensated.
  • the use of a regulating flap allows for a profiling of the nozzle gap, but is a very expensive solution compared to the aperture.
  • the headbox of the aforementioned German patent application DE 10 2004 047 879 A1 now has at the diaphragm on a main surface touched by a pulp suspension, which runs parallel to the inner surface of the upper nozzle wall of the headbox nozzle.
  • a headbox of the type mentioned in the introduction in that at least one refracting surface touched by a pulp suspension during operation of the headbox is provided between the shoulder surface of the diaphragm and the main face of the diaphragm.
  • the refractive surface of the diaphragm contacted by a pulp suspension during operation of the headbox can be arranged directly or indirectly between the two surfaces of the diaphragm of the headbox.
  • the inventive improvement of the headbox of the type mentioned ensures a continuous and process-safe concern of at least one pulp suspension having pulp suspension flow at the diaphragm in all possible operating conditions. This is achieved in particular as a result of the avoidance of the existing edge formed as a bend between the ramp surface of the diaphragm and the main surface of the diaphragm.
  • the refracting surface of the diaphragm touched by a pulp suspension during operation of the headbox has a convexly curved surface shape with a radius of curvature in the range of 0.1 to 5 mm, preferably 0, 5 to 3 mm, in particular of 1 mm, on.
  • the refraction surface of the diaphragm is - seen in the flow direction of the at least one pulp suspension - upstream of the ramp surface of the diaphragm and arranged downstream of the main surface of the diaphragm. The refraction surface of the diaphragm is thus arranged directly between the two surfaces of the diaphragm of the headbox.
  • the refracting surface of the diaphragm touched by a pulp suspension during operation of the headbox - seen in the direction of flow of the at least one pulp suspension - has a planar surface shape with an areal length in the range of 0.2 to 2 mm, preferably 0, 5 to 1, 5 mm, in particular of 1 mm, and preferably angle halving surface arrangement.
  • the refraction surface of the diaphragm is again arranged directly or indirectly between the ramp surface of the diaphragm and the main surface of the diaphragm.
  • the refractive surface of the diaphragm touched by a fibrous suspension during operation of the headbox is arranged directly between the run-up surface of the diaphragm and the main surface of the diaphragm, if the ramp surface of the diaphragm directly precedes the diaphragm's refraction surface and the main surface the aperture of the refractive surface of the diaphragm is immediately downstream.
  • the refracting surface of the diaphragm touched by a pulp suspension during operation of the headbox can be arranged upstream or downstream of a respective secondary surface of the inflow and outflow in the two last embodiments of the invention.
  • the refracting surface of the diaphragm is then arranged indirectly between the run-up surface of the diaphragm and the main surface of the diaphragm.
  • the refraction surface of the diaphragm can also adjoin only one side of a refractive secondary surface.
  • the main surface of the diaphragm contacted by a pulp suspension may be aligned parallel to the inner surface of the headbox upper nozzle wall.
  • the main surface of the diaphragm contacted by a fibrous suspension can also be oriented at a divergent angle of up to 15 °, preferably of up to 10 °, in particular of up to 5 °, to the inner surface of the upper nozzle wall of the headbox jet.
  • the ramp surface of the diaphragm and the inner surface of the upper nozzle wall of the headbox nozzle include an angle in the range of ⁇ 150 °, preferably of ⁇ 135 °, in particular of ⁇ 120 °.
  • the panel also preferably has a diaphragm board in the range of> 0 to 10 mm, preferably from 1 to 6 mm, in particular from 2 to 5 mm.
  • This positive baffle board means that the baffle - seen in the direction of flow of the at least one pulp suspension - protrudes from the top nozzle wall of the headbox, even if the baffle board for the purpose of profiling the at least one fibrous suspension comprising pulp suspension jet has to be reduced.
  • the pulp suspension jet comprising at least one pulp suspension In order to ensure that the pulp suspension jet comprising at least one pulp suspension is again applied to the diaphragm, it preferably has a diaphragm thickness in the range from 10 to 40 mm, preferably in the range from 12 to 25 mm.
  • the reapplication of the pulp suspension jet comprising at least one fibrous suspension at the diaphragm also positively supports the achievement of a low beam contraction for the at least one pulp suspension comprising pulp suspension jet.
  • the diaphragm may be provided on the underside and in its height direction preferably with a plurality of slots. This enables an exact profiling of the fibrous suspension jet comprising at least one fibrous suspension in a simple and cost-effective manner.
  • the lower nozzle wall - in the flow direction of at least one pulp suspension - preferably a supernatant in the range of 6 to 30 mm, preferably in the range of 12 to 25 mm, relative to the diaphragm on.
  • the main surface of the diaphragm touched by a fibrous suspension is preferably arranged at a vertical distance of at least 6 mm, preferably of at least 12 mm, from the lower nozzle wall of the headbox nozzle.
  • the fins preferably have a respective lamella length in the range of 50 to 98%, preferably in the range of 65 to 95%, of the length of the headbox nozzle.
  • the headbox according to the invention can also be designed as a multi-layer headbox with at least one separating element.
  • multilayer fibrous webs with different layer qualities can be produced.
  • the headbox according to the invention is also outstandingly suitable for use in a machine for producing a fibrous web, in particular a paper, board or tissue web.
  • the fibrous web produced in the machine with at least one headbox according to the invention has consistently excellent properties, in particular of the aforementioned type.
  • FIG. 1 shows a vertical and schematic longitudinal sectional view of a part
  • Embodiment of a headbox for a machine for producing a fibrous web according to the prior art Embodiment of a headbox for a machine for producing a fibrous web according to the prior art.
  • Figures 2 to 5 vertical and schematic longitudinal sectional views of embodiments of a headbox according to the invention for a machine for producing a fibrous web.
  • FIG. 1 to 5 each show a headbox nozzle 8 of a headbox 1 for a machine for producing a fibrous web 2 (see Figures 1 and 5) in a vertical and schematic longitudinal sectional view part.
  • the fibrous web 2 may in particular be a paper, board or tissue web.
  • the respective headbox 1 for a machine for producing a fibrous web 2 from at least one pulp suspension 3 (arrow) comprises an upper
  • Nozzle wall 4 and a lower nozzle wall 5 (see Figures 1 and 5) and two not explicitly shown side walls 6 (see Figures 1 and 5).
  • These four components 4, 5, 6 form an interior 7 of the headbox nozzle 8, which is traversed by the pulp suspension 3 (arrow) and which tapers in the flow direction S (arrow) of the pulp suspension 3 (arrow) to an outlet 9.
  • a diaphragm 1 which can be displaced by means of a plurality of elements 10 and extends over the machine width B (arrow), is arranged on the outlet side.
  • the single element 10 is formed for example as a threaded spindle which engages the top of the panel and in turn is actuated by a handwheel, an electric motor or the like.
  • the iris 1 1 shown in each of FIGS. 1 to 5 has an iris board A and an iris immersion depth T. Furthermore, during operation of the headbox 1, it has at least two surfaces touched by a fibrous suspension 3 (arrow), an upstream ramp surface 12 and an immediate contact surface. bar (see Figure 1) or indirectly (see Figures 2 to 5) downstream main surface 13, on.
  • the diaphragm 11 according to the prior art shown in FIG. 1 now has a main surface 13, which is in contact with a fibrous suspension 3 (arrow) and runs parallel to the inner surface 14 of the upper nozzle wall 4 (symbol representation). Between the ramp surface 12 of the diaphragm 11 and the main surface 13 of the diaphragm 11 so designed as a bend edge 15 is provided. At this edge 15 there are flow separations (area 16) in the at least one pulp suspension 3 (arrow) having pulp suspension flow.
  • FIGS. 2 to 5 show vertical and schematic longitudinal sectional views of four embodiments of a headbox 1 according to the invention for a machine for producing a fibrous web 2.
  • refraction surface 17 of the respective diaphragm 11 can be arranged directly or indirectly between the two surfaces 12, 13 of the diaphragm 11 of the headbox 1.
  • the refracting surface 17 of the diaphragm 11 contacted by a pulp suspension 3 during operation of the headbox 1 - seen in the flow direction S (arrow) of the at least one pulp suspension 3 (arrow) - has a convexly curved surface form 18 with a radius of curvature 18.R in the range of 0.1 to 5 mm, preferably from 0.5 to 3 mm, in particular of 1 mm.
  • This refracting surface 17 of the diaphragm 11 is arranged directly between the two surfaces of the diaphragm 11 of the headbox 1, the ramp surface 12 and the main surface 13.
  • the refracting surface 17 of the diaphragm 11, which is in contact with the at least one pulp suspension 3 (arrow) in the flow direction S (arrow) during operation of the headbox 1, has a convex curved surface 19 with a radius of curvature 19 .R in the range of> 5 mm.
  • the refracting surface 17 of the diaphragm 11 contacted by a pulp suspension 3 during operation of the headbox 1 - seen in the flow direction S (arrow) of the at least one pulp suspension 3 (arrow) - has a planar surface shape 20 with an areal length 20.
  • L in the range of 0.2 to 2 mm, preferably 0.5 to 1, 5 mm, in particular of 1 mm, and angle halving surface arrangement.
  • the angle halving surface arrangement of the planar surface form 20 is indicated by the two equal angles ⁇ .
  • the planar surface form 20 can of course also be arranged on one side.
  • the refracting surface 17 of the diaphragm 11, which is in contact with a fibrous suspension 3 during operation of the headbox 1, is preceded respectively by a further refractive side surface 19.1, 19.2 or 20.1, 20.2 both upstream and downstream.
  • These two refraction surfaces 17 of the diaphragm 11 are therefore arranged indirectly between the two surfaces of the diaphragm 11 of the headbox 1, the ramp surface 12 and the main surface 13.
  • the main surface 13 of the diaphragm 11 touched by a pulp suspension 3 is at a divergent angle ⁇ of up to 15 °, preferably of up to 10 °, in particular of up to 5 °, to the inner surface 14 of the upper nozzle wall 4 of the headbox 8 is aligned.
  • the ramp surface 12 of the diaphragm 11 and the inner surface 14 of the upper nozzle wall 4 of the headbox 8 thereby enclose an angle ⁇ in the range of ⁇ 150 °, preferably of ⁇ 135 °, in particular of ⁇ 120 °.
  • lower nozzle walls of the headbox 8 of Figures 2 to 4 have such a supernatant.
  • the refractive surface 17 of this diaphragm 11 which is in contact with a fibrous suspension 3 during operation of the headbox 1 can in turn have a convexly curved surface shape 18, 19 (see FIGS. 2 and 3) or a planar surface shape 20 (see FIG be provided with refractive side surfaces 19.1, 19.2 and 20.1, 20.2 (see Figures 3 and 4).
  • a diaphragm board A in the range of> 0 to 10 mm, preferably from 1 to 6 mm, in particular from 2 to 5 mm on.
  • This positive diaphragm A means that the individual diaphragm 1 1 - seen in the flow direction S (arrow) of at least one pulp suspension 3 (arrow) - protrudes from the upper nozzle wall 4 of the headbox.
  • the respective panel of Figures 2 to 5 further has an aperture thickness D in the range of 10 to 40 mm, preferably in the range of 12 to 25 mm.
  • it can be provided with a plurality of slots 21 (dashed representation) in its height direction H (arrow).
  • the slots 21 may have rectangular and / or wedge-shaped and / or parabolic and / or round shapes.
  • a pulp suspension 3 (arrow) touched main surface 13 of the aperture 1 1 of Figures 2 to 5 is arranged at a vertical distance C of at least 6 mm, preferably at least 12 mm, from the lower nozzle wall 5 of the headbox 8 (see. FIG. 5).
  • a plurality of fins 22 may be arranged, the downstream finned tips 23 preferably in the region of the aperture 11th lie.
  • the lamellae 22 preferably have a respective lamella length 22.L in the range of 50 to 98%, preferably in the range of 65 to 95%, of the length 8.L of the headbox nozzle 8.
  • the headbox 1 can also be designed as a multi-layer headbox with at least one separating element.
  • the headbox 1 can be provided in a further embodiment with a sectioned material density control (dilution water technology, "ModuleJet”), as it is known, for example, from the German patent DE 40 19 593 C2.
  • ModuleJet sectioned material density control
  • the headbox 1 illustrated and described in each case at least in regions in FIGS. 2 to 5 is particularly suitable for use in a machine for producing a fibrous web, in particular a paper or board web, from at least one fibrous stock suspension.
  • a headbox of the type mentioned is improved by the invention so that a concern of at least one pulp suspension having pulp suspension flow is continuously and reliably provided at the diaphragm at all possible operating conditions and aperture angles.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne une caisse de tête (1) pour une machine servant à fabriquer une bande de matériau fibreux (2), en particulier une bande de papier, carton ou papier à usage sanitaire et domestique, à partir d'une suspension de matériau fibreux (3), ladite caisse de tête comprenant une buse (8) présentant une paroi de buse supérieure (4), une paroi de buse inférieure (5) et deux parois latérales (6), s'effilant vers une sortie (9) et présentant une chambre interne (7) traversée par la suspension de matériau fibreux (3), dans une direction d'écoulement (S), lorsque la caisse de tête (1) est en service, un obturateur (11), pouvant coulisser par plusieurs éléments (10) et s'étendant sur la largeur (B) de la machine, étant disposé sur la paroi de buse supérieure (4) de la buse (8), côté sortie, ledit obturateur (11) possédant une saillie (A) et une profondeur d'immersion (T) et présentant au moins deux surfaces, une surface d'amenée (12) en amont et une surface principale (13) en aval, avec lesquelles une suspension de matériau fibreux (3) vient en contact lors du fonctionnement de la caisse de tête (1). La tête de caisse (1) selon l'invention est caractérisée en ce qu'au moins une surface de déviation (17) de l'obturateur (11) est située entre la surface d'amenée (12) et la surface principale (13) de l'obturateur (11), une suspension de matériau fibreux (3) venant en contact avec ladite surface de déviation (17) lorsque la caisse de tête (1) est en service.
EP10718128.1A 2009-06-22 2010-04-26 Tête de caisse pour une machine servant à fabriquer une bande de matériau fibreux Not-in-force EP2446083B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009027079A DE102009027079A1 (de) 2009-06-22 2009-06-22 Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
PCT/EP2010/055521 WO2010149413A2 (fr) 2009-06-22 2010-04-26 Caisse de tête pour une machine servant à fabriquer une bande de matériau fibreux

Publications (2)

Publication Number Publication Date
EP2446083A2 true EP2446083A2 (fr) 2012-05-02
EP2446083B1 EP2446083B1 (fr) 2013-07-24

Family

ID=43123052

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10718128.1A Not-in-force EP2446083B1 (fr) 2009-06-22 2010-04-26 Tête de caisse pour une machine servant à fabriquer une bande de matériau fibreux

Country Status (5)

Country Link
US (1) US20120138251A1 (fr)
EP (1) EP2446083B1 (fr)
CN (1) CN102428228A (fr)
DE (1) DE102009027079A1 (fr)
WO (1) WO2010149413A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010041332A1 (de) 2010-09-24 2012-01-19 Voith Patent Gmbh Blattbildungssystem
DE102010042106A1 (de) 2010-10-07 2012-04-12 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer zumindest einschichtigen Faserstoffbahn
US8877011B2 (en) * 2011-05-11 2014-11-04 Hollingsworth & Vose Company Systems and methods for making fiber webs
DE102011080424A1 (de) 2011-08-04 2013-02-07 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer zwei- oder mehrschichtigen Faserstoffbahn
WO2016096750A1 (fr) * 2014-12-16 2016-06-23 Philip Morris Products S.A. Appareil de coulée pour la production d'une bande coulée de matériau de tabac homogénéisé
CN105780577B (zh) * 2016-03-18 2018-08-07 杭州湿法无纺布设备有限公司 湿法成型装置及方法
CN114908601B (zh) * 2022-05-06 2024-08-30 杭州美辰纸业技术有限公司 一种具有较好适应性的流浆箱

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Publication number Priority date Publication date Assignee Title
GB1417736A (en) * 1972-02-24 1975-12-17 Beloit Corp Paprer-making machines
US4373993A (en) * 1980-03-07 1983-02-15 Mitsubishi Jukogyo Kabushiki Kaisha Slice lip forming a smooth continuous surface
DE4019593C2 (de) 1990-06-20 1994-01-20 Voith Gmbh J M Stoffauflauf für Papiermaschinen
DE102004047879A1 (de) 2004-10-01 2006-04-06 Voith Paper Patent Gmbh Stoffauflauf
DE102007036945A1 (de) * 2007-08-04 2009-02-05 Voith Patent Gmbh Verfahren zur Beeinflussung der Zweiseitigkeit der Layer Orientation und Stoffauflauf zur Durchführung des Verfahrens

Non-Patent Citations (1)

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Title
See references of WO2010149413A3 *

Also Published As

Publication number Publication date
US20120138251A1 (en) 2012-06-07
CN102428228A (zh) 2012-04-25
DE102009027079A1 (de) 2010-12-23
WO2010149413A2 (fr) 2010-12-29
WO2010149413A3 (fr) 2011-02-24
EP2446083B1 (fr) 2013-07-24

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