EP2106478A1 - Arrivée de pâte d'une machine destinée à fabriquer une bande de matière fibreuse - Google Patents

Arrivée de pâte d'une machine destinée à fabriquer une bande de matière fibreuse

Info

Publication number
EP2106478A1
EP2106478A1 EP07856999A EP07856999A EP2106478A1 EP 2106478 A1 EP2106478 A1 EP 2106478A1 EP 07856999 A EP07856999 A EP 07856999A EP 07856999 A EP07856999 A EP 07856999A EP 2106478 A1 EP2106478 A1 EP 2106478A1
Authority
EP
European Patent Office
Prior art keywords
headbox
nozzle
diaphragm
range
flow
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Withdrawn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
EP07856999A
Other languages
German (de)
English (en)
Inventor
Wolfgang Ruf
Uli Dürr
Klaus Lehleiter
Konstantin Fenkl
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
Priority claimed from DE200610062232 external-priority patent/DE102006062232A1/de
Priority claimed from DE200710023781 external-priority patent/DE102007023781A1/de
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2106478A1 publication Critical patent/EP2106478A1/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Withdrawn legal-status Critical Current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 headbox of a machine for producing a fibrous web from at least one pulp suspension, having a headbox having an upper nozzle wall and a lower nozzle wall, converging to a nozzle gap and having a flowed through by the at least one pulp suspension nozzle headbox, wherein on the upper nozzle wall outlet side a diaphragm extending over the machine width is arranged with a diaphragm projection surface having a diaphragm projection length and an diaphragm diaphragm surface having a diaphragm flow length, wherein an aperture extending over the engine width is provided on the lower nozzle wall with a diaphragm projection surface having an diaphragm projection length and an diaphragm flow surface having an diaphragm flow length; wherein the nozzle gap formed by the two orifice flow surfaces forms a light spa has lt shimmere.
  • the fibrous web may in particular be a paper, board or tissue web.
  • Such a headbox is known for example from German Patent DE 43 23 050 C1.
  • a headbox with a top nozzle wall and a lower nozzle wall having headbox known.
  • the headbox nozzle has a nozzle gap with a clear gap width and produces a pulp suspension jet with a jet thickness.
  • the upper nozzle wall is provided on the outlet side with a rigidly or displaceably arranged aperture, whereas the lower nozzle wall is designed on the outlet side as a variable lower lip and has a lower lip board.
  • the lower nozzle wall designed as a lower lip usually has a lower lip board of approximately twice the value of the jet thickness of the pulp suspension jet issuing from the die gap. This dimensioning serves, in particular, to stabilize the direction of the pulp suspension jet emerging from the headbox nozzle with a discharge angle.
  • the launch angle of the pulp suspension jet is thus largely independent of the lip opening, that is on the size of the clear gap width.
  • the launch angle changes with an adjustment of the nozzle gap and associated profiling thereof for the purpose of correcting the fiber orientation.
  • the launch angle of the pulp suspension jet is largely independent of manufacturing and assembly inaccuracies in the headbox area of the headbox.
  • a disadvantage is that such a known design of the headbox nozzle provides an asymmetry in the flow, which is reflected in an asymmetry of the free-jet properties of exiting the headbox jet pulp suspension jet. This asymmetry leads to different wall friction on the top and the bottom side of the pulp suspension jet and thus to different properties of the fiber suspension. Fabric in z-direction. These z-directional properties are, for example, the formation or the tenacity ratio.
  • the invention has the object of developing a headbox of the type mentioned in such a way that the disadvantages of the prior art mentioned largely or even completely avoided.
  • the properties in the z-direction of both the pulp suspension jet and the fibrous web should be as symmetrical as possible.
  • the headbox is symmetrical or approximately symmetrical that the outlet side disposed on the upper nozzle side upper aperture is positioned positioned that the lower nozzle wall at the outlet side disposed lower aperture is preferably positioned and that the orifice flow length of the diaphragm flow area of the lower diaphragm> the diaphragm flow length of the diaphragm flow surface of the upper diaphragm is selected so that the lower diaphragm forms a lower lip with a lower lip board in the range of 0 to 32 mm, depending on the clear gap width ,
  • the inventive design of the headbox symmetrical or approximately symmetrical geometries are created which allow the generation of both a pulp suspension jet and a fibrous web with symmetrical properties as possible in the z direction. Furthermore, only a minimal change in the launch angle is effected in a profiling of the nozzle gap or a gap width adjustment of the nozzle gap.
  • the pulp suspension jet thus experiences only a minimal beam deflection, which preferably assumes a value below 1 °. Thereby the beam deflection becomes defined between the fixed lower nozzle lower wall and the jet direction of the pulp suspension jet.
  • the headbox according to the invention is advantageously used in the production of fibrous webs of wood-free grades, such as copying paper.
  • the tenacity ratio on the top side of the web must be as equal as possible to the tenacity ratio on the bottom side of the web. This requirement can be met with the headbox according to the invention.
  • a symmetrically or approximately symmetrically formed headbox nozzle favors the production of a fibrous web with as symmetrical properties as possible in the z-direction.
  • An adjustment of the nozzle gap or a profiling of the nozzle gap of such a headbox only have a minimal effect on the beam deflection and thus the reject angle of the pulp suspension jet.
  • the lower lip board is selected depending on the convergence of the opposing panel and the maximum clear gap width, especially in the production of a wood-free fibrous web, just that on the one hand, the unilateral friction influence of the lower lip board with respect to the flat position of the fibrous web is acceptable and on the other just so is chosen small that the reject angle changes of the pulp suspension jet are at least locally changing a diaphragm in an acceptable range.
  • the headbox has a lower lip board as a function of the convergence of the two panels.
  • the diaphragm flow surfaces of the two diaphragms converge in the flow direction of the pulp suspension and thereby have a nozzle convergence angle in the range of 0 to 180 °, preferably from 0 to 30 °, in particular from 4 to 20 °, form.
  • a nozzle convergence angle in the range of 0 to 180 °, preferably from 0 to 30 °, in particular from 4 to 20 °, form.
  • the formation and the profile of the breaking length ratio of the fibrous web in the z-direction can be adjusted in a targeted manner. The larger the selected angle, the greater the orientation in machine direction.
  • the ratio of the lower lip board to the gap width can take on a value of zero. This allows the achievement of maximum symmetry of certain properties in the z direction of the fibrous web.
  • the ratio of the lower lip board to the gap width may be in the range of up to 0.8, preferably up to 0.3. In this way, in turn, the greatest possible symmetry can be achieved.
  • the ratio of the lower lip board to the gap width may be in the range of up to 1.0, preferably in the range of 0.3 to 1.0.
  • the ratio of the lower lip board to the gap width can be a value in
  • the lower lip board with a clear gap width of 20 mm can assume a maximum value of 32 mm.
  • the aperture projection length of at least one aperture preferably has a preferably adjustable value in the range from 0 to 30 mm, preferably from 1 to 10 mm.
  • the preferably adjustable value for the diaphragm protrusion length of at least one diaphragm during operation of the headbox can vary over the machine width in the range of +/- 1.5 mm.
  • a transition surface with a radius in the range of 1 to 5 mm is preferably provided.
  • the transition surface can also be provided with a chamfer width in the range of 1 to 5 mm, wherein the transition surface is preferably arranged at half the angle to the two surfaces.
  • the orifice flow length of the orifice flow area of at least one orifice further preferably has a value in the range of 0.2 to 2.0 * clear slit width of the headbox nozzle, preferably 0.3 to 1.0 "gap width of the headbox nozzle.
  • the two nozzle walls of the headbox nozzle converge in the flow direction of the pulp suspension and thereby have a Wandververgenzwinkel in the range of 2 to 40 °, preferably from 4 to 20 °, in particular from 8 to 15 °, form.
  • the nozzle cone angle and the Wandkonvergenzwinkel assume an equal, approximately equal or different value.
  • the positionable and over the machine width concernedre- ckende aperture of the upper nozzle wall and the upper nozzle wall under flow aspects preferably form an angle of attack in the range of 10 to 60 °, preferably from 15 to 45 °.
  • the upper nozzle wall of the headbox is preferably rotatably mounted on a hinge.
  • the aperture of the lower nozzle wall which preferably can be positioned and extend over the machine width, and the lower nozzle wall preferably form an alignment angle in the range from 10 to 60 °, preferably from 15 to 45 °.
  • the downstream region of at least one nozzle wall of the headbox nozzle can be designed at least in regions as a control flap rotatably mounted on a joint.
  • At least one separating blade may be arranged. If a plurality of separating lamellae are arranged in the nozzle space of the headbox nozzle, then at least two of them may have the same or approximately the same length.
  • the separating lamellae arranged in the nozzle space of the headbox nozzle can be arranged symmetrically or asymmetrically. The number, the arrangement and the configuration of the at least one separating lamella essentially depends on the degree of technological optimization in the area of the headbox.
  • Figure 1 is a schematic partial side view of an embodiment of a headbox according to the invention of a machine for producing a fibrous web from at least one pulp suspension;
  • FIGS. 2 and 3 are each a schematic partial side view of the headbox of Figure 1 in conjunction with a downstream, but only schematically indicated sheet forming unit; and FIGS. 4a to 4c each show a schematic partial side view of an embodiment of a headbox according to the invention of a machine for producing a fibrous web from at least one fibrous suspension, wherein a plurality of separating ribs are arranged in the nozzle space of the headbox nozzle.
  • FIG. 1 shows a schematic partial side view of a headbox 1 of a machine not shown further for producing a fibrous web from at least one pulp suspension 2.
  • the fibrous web may be in particular a paper, board or tissue web.
  • the headbox 1 comprises a headbox nozzle 3, which has an upper nozzle wall 4 and a lower nozzle wall 5, which converges to form a nozzle gap 6 and which has a nozzle chamber 7 through which at least one fibrous stock suspension 2 flows.
  • the two nozzle walls 4, 5 of the headbox nozzle 3 converge in the flow direction S (arrow) of the pulp suspension 2 and form a Wandkonvergenzwinkel ⁇ .1 in the range of 2 to 40 °, preferably from 4 to 20 °, in particular from 8 to 15 ° ,
  • the pulp suspension 2 leaves the nozzle gap 6 of the headbox nozzle 3 in the form of a pulp suspension jet F at a reject angle ⁇ , the is defined as the angle between the main axis H of the headbox 1 and the jet direction R of the pulp suspension jet F.
  • the pulp suspension jet has a jet thickness d shortly after leaving the nozzle gap 6.
  • a diaphragm 8 extending over the machine width B (arrow) with a diaphragm projection length VL.8 having an aperture diaphragm surface VF.8 and an diaphragm diaphragm surface SF.8 having a diaphragm flow length SL.8 can be positioned on the outlet side (double motion arrow A.8). arranged.
  • the positioning of the upper panel 8 can be done for example by means of several arranged along the panel 8 and not explicitly shown elements, wherein the respective element may be formed, for example, as a threaded spindle which engages the top of the panel 8 and in turn by a servomotor, a handwheel or the like is operable.
  • an aperture 9 extending beyond the machine width B (arrow) and having an aperture projection length VL.9 having an aperture projection surface VF.9 and an aperture flow aperture SF.9 having an aperture flow length SL.9 can preferably be positioned on the outlet side (movement double-headed arrow) A.9).
  • the preferred positioning of the lower panel 9 can be done for example by means of several arranged along the panel 9 and not explicitly shown elements, wherein the respective element may be formed, for example, as a threaded spindle which engages the top of the panel 8 and in turn by a servomotor, a Handwheel or the like can be actuated.
  • the headbox nozzle 3 of the headbox 1 is symmetrical or approximately symmetrical and the diaphragm flow length SL.9 of the diaphragm flow the lower diaphragm 9. of the diaphragm flow length SL.8 of the diaphragm flow surface SF.8 of the upper diaphragm 8 is selected so that the lower diaphragm 9, depending on the clear gap width s, has a lower lip 10 with a lower lip guide L.10 in FIG Range from 0 to 32 mm forms.
  • the orifice flow surfaces SF.8, SF.9 of the two diaphragms 8, 9 converge in the flow direction S (arrow) of the pulp suspension 2 and thereby form a nozzle convergence angle ⁇ .2 in the range from 0 to 180 °, preferably from 0 to 30 °, in particular 4 to 20 °, off.
  • the ratio of the lower lip board L.10 to the gap width s may assume a value of 0;
  • the ratio of lower lip board L.10 to clear gap width s may assume a value in the range of up to 0.8, preferably of up to 0.3; at a nozzle convergence angle ⁇ .2 in the range of 4 to 14 °, the ratio of lower lip board L.10 to clear gap width s may assume a value in the range of up to 1.0, preferably in the range of 0.3 to 1.0 ; and
  • the ratio of lower lip board L.10 to clear gap width s may assume a value in the range of up to 1.6, preferably in the range of 0.8 to 1.6 ,
  • the lower panel 9 can have a lower lip 10 with a lower lip board L.10 in the range from 0 to 32 mm, assuming a maximum clearance gap s of 20 mm.
  • the diaphragm protrusion length VL.8, VL.9 of at least one diaphragm 8, 9 has a preferably adjustable value in the range from 0 to 30 mm, preferably from 1 to 10 mm. This setting can be done for example by the already described positioning of the corresponding aperture 8, 9.
  • VL.9 at least one aperture 8, 9 in the operation of the headbox 1 over the machine width B (arrow) across in the range of +/- 1, 5 mm vary.
  • a transition surface F.8 with a radius R.8 in the range of 1 to 5 mm is provided between the diaphragm advancement surface VF.9 and the diaphragm flow surface SF.9 of a lower diaphragm 9, wherein the transitional surface F.9 is preferably at half the angle to the two surfaces VF.9, SF.9 is arranged.
  • the same types of transition surfaces F.8, F.9 can also be arranged on both sides.
  • the diaphragm flow length SL.8, SL.9 of the diaphragm flow surface SF.8, SF.9 of at least one diaphragm 8, 9 has a value in the range of 0.2 to 2.0 * clear gap width s of the headbox nozzle 3, preferably from 0, 3 to 1, 0 * clear gap width s of the headbox nozzle 3, on.
  • the positionable and over the machine width B (arrow) extending upper aperture 8 of the upper nozzle wall 4 and the upper nozzle wall 4 form an angle ⁇ .3 in the range of 10 to 60 °, preferably from 15 to 45 °.
  • the upper nozzle wall 4 of the headbox nozzle 3 is rotatably mounted on a joint 11 which is indicated only schematically (movement double arrow C).
  • lower aperture 9 of the lower nozzle wall 5 and the lower nozzle wall 5 form an alignment angle ⁇ .4 in the range of 10 to 60 °, preferably from 15 to 45 °
  • the downstream region of the lower nozzle wall 5 of the headbox nozzle 3 is at least partially formed as a on a merely schematically indicated joint 13 rotatable (double motion arrow D) mounted control valve 12.
  • the upper nozzle wall 4 may be provided with a control flap.
  • the two Figures 2 and 3 each show a schematic side view of the headbox 1 of Figure 1 in conjunction with a downstream, but only schematically indicated sheet forming unit 14.
  • the respective sheet forming unit 14 is a Doppelsiebformer 15 in the form of a so-called gap former.
  • the twin-wire former 15 comprises two endless sieves 16, 17, each forming a sieve loop, of which the first sieve 16 is guided over a peripheral region 19 of a first deflection element 18 and the second sieve 17 is guided over a peripheral region 21 of a second deflection element 20.
  • the two screens 16, 17 run after the expiration of the respective deflecting element 18, 20 together to form a wedge-shaped material inlet gap 22, which receives the at least one fibrous suspension 2 directly from the headbox 1, and then form a Doppelsiebsize 23, not shown in which the two sieves 16, 17 are first guided over forming and / or drainage elements.
  • the two screens 16, 17 can already converge in the peripheral region 19 of the first deflecting element 18.
  • the first deflecting element 18 is an evacuated forming roll 24, whereas the second deflecting element 20 is a breast roll 25 having a preferably closed surface.
  • the first deflecting element 18, that is to say the forming roller 24, is on the equilateral side arranged lower nozzle wall 5 and the lower aperture 9.
  • the first deflecting element 18, that is to say the forming roller 24, in the embodiment according to FIG. 3 is mutually arranged on the lower nozzle wall 5 and the lower diaphragm 9.
  • FIGS. 4a to 4c each show a schematic partial side view of an embodiment of a headbox 1 of a machine for producing a fibrous web from at least one fibrous suspension 2.
  • the fibrous web can, in turn, be a paper, board or tissue web.
  • the respective headbox 1 comprises a headbox nozzle 3, which has an upper nozzle wall 4 and a lower nozzle wall 5, which converges to form a nozzle gap 6 and which has a nozzle chamber 7 through which at least one fibrous stock suspension 2 flows.
  • the two nozzle walls 4, 5 of the headbox nozzle 3 converge in the flow direction S (arrow) of the pulp suspension 2.
  • the individual headbox nozzle 3 corresponds at least in essential properties of a headbox nozzle 3 shown in Figures 1, 2 or 3, so that reference is made to the descriptions of Figures 1, 2 and 3 with respect to further descriptions.
  • a plurality of separating blades 26 are now arranged in each nozzle chamber 7 of the headbox nozzle 3.
  • only one separating blade may be arranged in the nozzle space of the headbox nozzle.
  • the separating lamellae 26 are fastened to a turbulence generator 27 of the headbox 1 in a manner known to the person skilled in the art, for example by means of known separator lamella holders. Furthermore, the four separating lamellae 26, which are arranged in the nozzle space 7 of the headbox nozzle 3 shown in FIG. 4a, have the same or approximately the same length L.26.
  • only two of the four separating lamellae 26, which are arranged in the respective nozzle chamber 7 of the headbox nozzle 3 shown in FIGS. 4b and 4c, have the same or approximately the same length L.26.
  • the four separating blades 26, which are arranged in the nozzle chamber 7 of the headbox nozzle 3 shown in FIG. 4b, are arranged symmetrically, whereas the four separating blades 26, which are arranged in the respective nozzle chamber 7 of the headbox nozzle 3 shown in FIG. 4c, are arranged asymmetrically are.
  • the invention provides a material casserole which largely or even completely avoids the known disadvantages of the prior art.
  • the properties in the z-direction of both the pulp suspension jet and the fibrous web are formed as symmetrically as possible.

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  • Paper (AREA)

Abstract

L'invention concerne une arrivée de pâte (1) d'une machine destinée à fabriquer une bande de matière fibreuse à partir d'au moins une suspension de matière fibreuse (2), comprenant une buse d'arrivée de pâte (3) présentant une paroi de buse supérieure (4) et une paroi de buse inférieure (5), convergeant en une fente de buse (6) et présentant une chambre de buse (7) traversée par au moins une suspension de matière fibreuse (2). L'arrivée de pâte (1) selon l'invention est caractérisée en ce que la buse d'arrivée de pâte (3) est conçue de manière symétrique ou approximativement symétrique, le diaphragme supérieur (8) disposé côté sortie sur la paroi de buse supérieure (4) est agencé de manière positionnable, le diaphragme inférieur (9) disposé côté sortie sur la paroi de buse inférieure (5) est agencé de préférence de manière positionnable et la longueur d'écoulement de diaphragme (SL.9) de la surface d'écoulement de diaphragme (SF.9) du diaphragme inférieur (9) est choisi = à la longueur d'écoulement de diaphragme (SL.8) de la surface d'écoulement de diaphragme (SF.8) du diaphragme supérieur (9), de telle sorte que le diaphragme inférieur (9) forme, en fonction de la largeur de fente intérieure (s), une lèvre inférieure (10) avec une saillie de lèvre inférieure (L.10) dans le domaine de 0 à 32 mm.
EP07856999A 2006-12-22 2007-12-20 Arrivée de pâte d'une machine destinée à fabriquer une bande de matière fibreuse Withdrawn EP2106478A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200610062232 DE102006062232A1 (de) 2006-12-22 2006-12-22 Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn
DE200710023781 DE102007023781A1 (de) 2007-05-22 2007-05-22 Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn
PCT/EP2007/011276 WO2008077585A1 (fr) 2006-12-22 2007-12-20 Arrivée de pâte d'une machine destinée à fabriquer une bande de matière fibreuse

Publications (1)

Publication Number Publication Date
EP2106478A1 true EP2106478A1 (fr) 2009-10-07

Family

ID=39272071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07856999A Withdrawn EP2106478A1 (fr) 2006-12-22 2007-12-20 Arrivée de pâte d'une machine destinée à fabriquer une bande de matière fibreuse

Country Status (2)

Country Link
EP (1) EP2106478A1 (fr)
WO (1) WO2008077585A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007033938A1 (de) * 2007-07-20 2009-01-22 Voith Patent Gmbh Vorrichtung zur Herstellung einer Faserstoffbahn
DE102009028385A1 (de) 2009-08-10 2011-02-17 Voith Patent Gmbh Verfahren zum Betreiben einer Blattbildungseinheit und Blattbildungseinheit
DE102009028389A1 (de) 2009-08-10 2011-02-17 Voith Patent Gmbh Stoffauflauf, Blattbildungseinheit mit einem Stoffauflauf und Verfahren zum Betreiben einer Blattbildungseinheit
DE102010001610A1 (de) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
DE102010001614A1 (de) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
DE102010001615A1 (de) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
DE102010001613A1 (de) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf

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Publication number Priority date Publication date Assignee Title
DE4005147A1 (de) * 1990-02-17 1991-08-29 Voith Gmbh J M Verfahren und vorrichtung zum bilden einer faserstoffbahn
DE4241076C2 (de) 1992-11-05 1995-04-06 Voith Gmbh J M Stoffauflauf einer Papiermaschine mit variabler Unterlippe
DE4323050C1 (de) 1993-07-12 1995-02-16 Voith Gmbh J M Düse eines Mehrschichtenstoffauflaufes und Verfahren zum vermischungsarmen Zusammenführen mindestens zweier Stoffsuspensionsströme
DE19902621A1 (de) * 1999-01-23 2000-07-27 Voith Sulzer Papiertech Patent Stoffauflauf
DE19908299A1 (de) * 1999-02-26 2000-08-31 Voith Sulzer Papiertech Patent Stoffauflauf
DE10324711A1 (de) * 2003-05-30 2004-12-30 Voith Paper Patent Gmbh Stoffauflauf

Non-Patent Citations (1)

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Title
See references of WO2008077585A1 *

Also Published As

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