EP1693507B1 - Elément traînant pour une caisse de tête - Google Patents

Elément traînant pour une caisse de tête Download PDF

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Publication number
EP1693507B1
EP1693507B1 EP06100633A EP06100633A EP1693507B1 EP 1693507 B1 EP1693507 B1 EP 1693507B1 EP 06100633 A EP06100633 A EP 06100633A EP 06100633 A EP06100633 A EP 06100633A EP 1693507 B1 EP1693507 B1 EP 1693507B1
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EP
European Patent Office
Prior art keywords
insert
turbulence
cross
turbulence generator
length
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.)
Expired - Lifetime
Application number
EP06100633A
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German (de)
English (en)
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EP1693507A2 (fr
EP1693507A3 (fr
Inventor
Konstantin Fenkl
Klaus Lehleiter
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
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Voith Patent GmbH
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Publication date
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Publication of EP1693507A2 publication Critical patent/EP1693507A2/fr
Publication of EP1693507A3 publication Critical patent/EP1693507A3/fr
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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
    • D21F1/026—Details of the turbulence section

Definitions

  • the invention relates to a turbulence generator for a headbox of a machine for producing a fibrous web, in particular a paper, board or tissue web, from at least one pulp suspension, with a plurality of turbulence tubes for guiding and distributing the at least one pulp suspension, wherein at least one turbulence tube in the flow path the at least one pulp suspension changes at least once from a first cross section to a second cross section and at least one step change in cross section is created by an insert disposed in the turbulence tube having an insert length and an insert outside diameter, the insert having a slenderness ratio in the range of 1: 8 to 1:50, preferably 1:10 to 1:30, and wherein the degree of slimming is the ratio of insert outside diameter to insert length.
  • Such a turbulence generator is for example from German Offenlegungsschrift DE 101 02 087 A1 known.
  • the insert inserted into the turbulence tube is slidable and means are provided by which a change in the ratio L / D of the distance of a cross-sectional change to the end of the turbulence tube to the narrowest hydraulic diameter of this cross-sectional change can be effected.
  • the means for moving the insert may comprise, for example, at least one gear and a gear mesh.
  • an insert is used to influence the flow guidance, especially for equalizing the total volume flow, for setting the desired degree of turbulence and for targeted pressure loss generation.
  • German patent application DE 35 25 760 A1 in this case forms a channel and is in holes of two support plates, which are arranged in the flow direction of the pulp suspension at a certain distance from each other and form a guide member stored.
  • the insert may be surrounded by a spacer tube enclosing it.
  • it is due to its manufacturing process, such as a conventional mechanical processing or injection molding, relatively short, it has only a maximum length of 200 mm. He is thus adaptable only within narrow limits to variety-specific requirements.
  • the invention has the object of providing a turbulence generator with inserts of the type mentioned in such a way that it has a significantly improved range of use for a variety of variety-specific requirements.
  • the object is achieved by the characterizing feature of claim 1.
  • the slimming range of the "long" insert allows the use of the turbulence generator for a variety of purposes variety specific requirements.
  • pulp suspensions with strong segregation tendencies, high air contents and / or chemical affinities for adhesion to the surfaces in contact with the flow, in particular in the area of the headbox nozzle can be positively influenced by the variable design of the "long” inserts.
  • long-fiber pulp suspension such as kraft liners or sack force papers, but also wood-free papers with long-fiber pulp, which can increasingly tend to segregation due to lack of turbulence and thereby cause undesirable effects, in particular streaks in the fibrous web produced, can by variable Execution of the "long" missions are positively influenced.
  • the insert preferably has at least one cross-sectional change designed as a graduated step, which is arranged in the flow path of the at least one fibrous suspension at least in the last third, preferably in the last quarter, in particular in the last fifth of the insert length.
  • This arrangement region plays a decisive role in the degree of turbulence which the flowing pulp suspension has at the end of the turbulence tube and which is thus responsible for the flow properties of the pulp suspension at the beginning of the headbox nozzle.
  • the insert has a plurality of cross-sectional changes formed as a respective increment.
  • This embodiment allows for the continuous generation and maintenance of a minimum degree of turbulence in the pulp suspension. This minimum degree of turbulence is necessary in order not to get a segregation of the pulp suspension.
  • the insert further preferably has a total increment in relation to the insert length in the range from 1:10 to 1: 100, preferably from 1:12 to 1:75, in particular 1:15 to 1:50, wherein the total increment is the difference of the largest Internal insert diameter to insert outside diameter is.
  • This overall increment, in particular the last increment, also plays a decisive role for the degree of turbulence already explained.
  • the insert favorably has a plurality of inner surfaces having a roughness in the range of about 0.4 to about 1.0 microns. This area is particularly favorable for the cleanliness of the inner surfaces and the flow stability of the pulp suspension.
  • the insert In order to prevent complete insertion of the insert into the turbulence tube, it has, in an ideal embodiment, at its inlet end a plate-shaped projection whose outer diameter is greater than the inner diameter of the turbulence tube. Moreover, it is preferably provided at its inlet end with a chamfer, which has a very positive effect on the reduction of the pressure loss at the inlet end.
  • the insert has in a further embodiment along its insert length on the outside at least one web foot, preferably a plurality of more evenly distributed web feet.
  • the insert may consist of a plastic, preferably of a high-conductivity polymer such as in particular PPSU, PPS, PEI, PTFE or the like, or of a corrosion-resistant metal, preferably of stainless steel. Both types of material are particularly suitable for use, with an insert made of a plastic still manufacturing advantages and cost advantages.
  • FIG. 1 shows a schematic longitudinal representation of a turbulence generator 1 of a headbox of a machine for producing a fibrous web according to the prior art.
  • the fibrous web produced from at least one pulp suspension 2 may in particular be a paper, board or tissue web.
  • the turbulence generator 1 comprises a plurality of turbulence tubes 3 for guiding and distributing the at least one fibrous suspension 2.
  • the turbulence tubes 3 are usually arranged in rows and columns and they are in holes 4 of two support plates 5.1, 5.2, in the flow direction S (arrow) the pulp suspension 2 are arranged at a certain distance D from each other and form a guide member 6, stored.
  • the illustrated Turbulence generator 1 has two rows Z 1 , Z 2 on turbulence tubes 3, one speaks of a so-called "two-line”.
  • the respective turbulence tube 3 changes in the course of the flow of the at least one fibrous suspension 2 at least once from a first cross section A 1 to a second cross section A 2 and at least one formed as a step change in cross section change ⁇ A is arranged by a, in the turbulence tube 3 [at least inlet side] Insert 8 generates, which has an insert length L 8 and an insert outer diameter D 8 .
  • FIG. 1 In the execution of FIG. 1 is the cross-sectional change .DELTA.A formed at the end of the insert 8 as an end-step increment 7.
  • the insert 8 changes in its course once again its cross section from a cross section A 3 to the cross section A 1 in forming a second increment 9, wherein the cross section A 3 is the inlet cross section of the insert 8.
  • the second cross section A 2 is at the same time the cross section of the cylindrical or approximately cylindrical part of the turbulence tube 3.
  • the turbulence tube 3 can also be designed in two parts, so that the position of the second increment 9 lies at the contour transition of the two nested parts.
  • the pipe wall thickness of the inserted pipe part fixes the size and the position of the second step jump.
  • the insert 8 has in the prior art due to the possible and common manufacturing processes only an insert length L 8 of a maximum of about 200 mm. As a manufacturing process either mechanical machining or injection molding come into question.
  • FIG. 2 shows a further turbulence generator 1 of a headbox of a machine for producing a fibrous web according to the prior art.
  • the illustrated turbulence generator 1 additionally has a contraction bushing 10 in each turbulence tube 3, which was inserted downstream of the insert 8 into the turbulence tube 1 with the aim of further increasing the degree of turbulence of the fibrous suspension 2 toward the end of the turbulence tube 1.
  • the contraction bushing 10 is normally introduced from the outlet side 11 of the turbulence tube 3, so that in a turbulence tube 3 with a tapered rectangular outlet a contribution of the same without a previous removal of the "inlet" insert is no longer possible.
  • FIG. 3 now shows a turbulence generator 1 according to the invention of a headbox of a machine for producing a fibrous web. Since the basic construction of this turbulence generator 1 in turn essentially that of the in the FIG. 1 is shown, reference is made to the description of this turbulence generator.
  • the insert 8 has a degree of slimming T in the range of 1: 8 to 1:50, preferably 1:10 to 1:30, wherein the slenderness degree T is the ratio of insert outer diameter D 8 to insert length L 8 .
  • the insert 8 has an insert length L 8 , which is smaller in the range of 3 to 150 mm, preferably 5 to 100 mm, than the length L z of the preferably cylindrical or approximately cylindrical part of the turbulence tube 3. Its at least one inner surface 12 has a roughness R a in the range of about 0.4 to about 1.0 microns.
  • Both shown inserts 8 have at their inlet-side ends 13 depending on a plate-shaped projection 14 whose outer diameter D 14 is greater than the tube inner diameter d 3 of the turbulence tube 3, so that a complete Slipping of the respective insert 8 in the associated turbulence tube 3 is prevented.
  • Each insert 8 is also provided at its inlet end 13 with a chamfer 15.
  • the inserts 8 can also be designed without chamfers, wherein the sharp edge that arises in each case can lead to the rupture of fiber flakes due to strong contractions.
  • Each insert 8 also consists of a plastic, preferably of a high-conductivity polymer such as in particular PPSU, PPS, PEI, PTFE or the like, or of a corrosion-resistant metal, preferably of stainless steel.
  • a plastic preferably of a high-conductivity polymer such as in particular PPSU, PPS, PEI, PTFE or the like, or of a corrosion-resistant metal, preferably of stainless steel.
  • the upper insert 8.1 has a constant inner diameter d 8
  • the lower insert has a 8.2 formed as a step jump 9 second cross section change ⁇ A (from A 3 to A 1 ), in the flow of the at least one pulp suspension 2 at least in the last third, preferably in the last quarter, especially in the last fifth, the insert length L 8 is arranged.
  • the respective first cross-sectional change ⁇ A in the flow path of the at least one pulp suspension 2 is formed at the end of the associated insert 8.
  • the change in cross section ⁇ A takes place from a first cross-section A 1 to a second cross-section A 2 , wherein a step jump 7 is formed.
  • the respective insert 8 may have further, as a respective increment formed cross-sectional changes .DELTA.A.
  • Each insert 8 has a total increment in relation to the insert length L 8 in the range of 1:10 to 1: 100, preferably 1:12 to 1:75, in particular 1:15 to 1:50, wherein the total increment is the difference of largest inside diameter d 8 to insert outside diameter D 8 .
  • FIGS. 4 to 6 show further embodiments of inventive inserts 8 for a headbox of a machine for producing a fibrous web.
  • the use 8 of FIG. 4 has a second step change ⁇ A (from A 3 to A 1 ) formed as a step jump 9, which is arranged in the flow path of the at least one fibrous suspension 2 in the first third of the insert length L 8 .
  • FIG. 5 shown insert 8 has a constant inner diameter d 8 over the insert length L 8 and thus corresponds to the upper insert 8.1 of FIG. 3 ,
  • the insert 8 of the FIG. 6 in turn designed as a step jump 9 second cross-sectional change ⁇ A (from A 3 to A 1 ), which is arranged in the flow of the at least one pulp suspension 2 at least in the last third, preferably in the last quarter, especially in the last fifth of the insert length L 8 . It thus corresponds to the lower insert 8.2 of FIG. 3 ,
  • the inserts 8 of the invention FIGS. 3 to 6 have along their insert lengths L 8 on the outside at least one web foot 16, preferably a plurality of more evenly distributed web feet 16.
  • the individual cross-sections of the inserts 8 need not necessarily have a respective rotationally symmetrical cross-sectional contour. Rather, the respective inner cross-sectional contours as well as the corresponding outer cross-sectional contours may have polygons, for example triangular or quadrangular contours.
  • the invention provides a turbulence generator with inserts of the type mentioned in such a way that it has a significantly improved range of use for a variety of variety-specific requirements.

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  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Earth Drilling (AREA)

Claims (10)

  1. Turbulateur (1) pour l'amenée de matière à une machine de fabrication d'une nappe de fibres, en particulier d'une nappe de papier, de carton ou d'étoffe à partir d'au moins une suspension (2) de fibres,
    lequel turbulateur présente plusieurs tubes de turbulation (3) qui conduisent et répartissent la ou les suspensions (2) de fibres,
    au moins un tube de turbulation (3) passant au moins une fois d'une première section transversale (A1) à une deuxième section transversale (A2) dans la direction d'écoulement de la ou des suspensions (2) de fibres,
    une modification (ΔA) de la section transversale configurée en épaulement brusque (7) étant formée par une garniture (8) disposée dans le tube (3) de turbulation et présentant une longueur de garniture (L8) et un diamètre extérieur de garniture (D8),
    la garniture (8) présentant un degré de finesse (T) compris dans la plage de 1 : 8 à 1 : 50 et de préférence de 1 : 10 à 1 : 30,
    le degré de finesse (T) étant le rapport entre le diamètre extérieur (D8) de la garniture et la longueur (L8) de la garniture,
    caractérisé en ce que
    la garniture (8) présente une longueur de garniture (L8) plus petite de l'ordre de 3 à 150 mm et de préférence de 5 à 100 mm que la longueur de la partie cylindrique ou approximativement cylindrique du tube de turbulation (3).
  2. Turbulateur (1) selon la revendication 1, caractérisé en ce que la garniture (8) présente au moins une modification (ΔA) de sa section transversale configurée comme épaulement brusque (9) qui est disposé au moins dans le dernier tiers, de préférence dans le dernier quart et en particulier dans le dernier cinquième de la longueur (L8) de la garniture dans la direction d'écoulement de la ou des suspensions (2) de fibres.
  3. Turbulateur (1) selon les revendications 1 ou 2, caractérisé en ce que la garniture (8) présente plusieurs modifications (ΔA) de sa section transversale configurées chacune comme épaulement brusque (9).
  4. Turbulateur (1) selon l'une des revendications précédentes, caractérisé en ce que la garniture (8) présente entre l'épaulement global et la longueur (L8) de la garniture un rapport compris dans la plage de 1 : 10 à 1 : 100, de préférence de 1 : 12 à 1 : 75 et en particulier de 1 : 15 à 1 : 50, l'épaulement global étant la différence entre le plus grande diamètre intérieur (d8) de la garniture et le diamètre extérieur (D8) de la garniture.
  5. Turbulateur (1) selon l'une des revendications précédentes, caractérisé en ce que la garniture (8) présente plusieurs surfaces intérieures (12) dont la rugosité (R8) est comprise dans la plage d'environ 0,4 à environ 1,0 µm.
  6. Turbulateur (1) selon l'une des revendications précédentes, caractérisé en ce que la garniture (8) présente à son extrémité (13) située du côté de l'entrée un appendice (14) en forme de plateau dont le diamètre extérieur (D14) est plus grand que le diamètre intérieur (d3) du tube de turbulation (3), de manière à empêcher que la garniture (8) pénètre complètement par glissement dans le tube de turbulation (3).
  7. Turbulateur (1) selon l'une des revendications précédentes, caractérisé en ce que la garniture (8) est dotée d'un chanfrein (15) à son extrémité (13) située du côté de l'entrée.
  8. Turbulateur (1) selon l'une des revendications précédentes, caractérisé en ce que la garniture (8) présente sur sa longueur (L8) et du côté extérieur au moins un pied de nervure (16) et de préférence plusieurs pieds de nervure (16) répartis en particulier de manière régulière.
  9. Turbulateur (1) selon l'une des revendications précédentes, caractérisé en ce que la garniture (8) est constituée d'une matière synthétique et de préférence d'un polymère à haute performance, par exemple le PPSU, le PPS, le PEI, le PTFE ou similaires.
  10. Turbulateur (1) selon l'une des revendications 1 à 8, caractérisé en ce que la garniture (8) est réalisée en un métal résistant à la corrosion et de préférence en acier allié.
EP06100633A 2005-02-22 2006-01-20 Elément traînant pour une caisse de tête Expired - Lifetime EP1693507B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005008269A DE102005008269A1 (de) 2005-02-22 2005-02-22 Turbulenzerzeuger für einen Stoffauflauf

Publications (3)

Publication Number Publication Date
EP1693507A2 EP1693507A2 (fr) 2006-08-23
EP1693507A3 EP1693507A3 (fr) 2006-10-04
EP1693507B1 true EP1693507B1 (fr) 2009-08-26

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EP06100633A Expired - Lifetime EP1693507B1 (fr) 2005-02-22 2006-01-20 Elément traînant pour une caisse de tête

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EP (1) EP1693507B1 (fr)
AT (1) ATE440996T1 (fr)
DE (2) DE102005008269A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008010447U1 (de) 2008-08-06 2008-10-16 Voith Patent Gmbh Führungseinrichtung für einen Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffsuspension
DE102008042032A1 (de) 2008-09-12 2010-03-18 Voith Patent Gmbh Turbulenzerzeuger für einen Stoffauflauf, Stoffauflauf und Verfahren zur Herstellung des Turbulenzerzeugers
DE202008012690U1 (de) 2008-09-24 2008-11-27 Voith Patent Gmbh Führungseinrichtung für einen Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffsuspension
DE102009045221A1 (de) 2009-09-30 2011-03-31 Voith Patent Gmbh Turbulenzerzeuger für einen Stoffauflauf, Stoffauflauf und Verfahren zur Herstellung des Turbulenzerzeugers
DE202009013036U1 (de) 2009-09-30 2010-02-25 Voith Patent Gmbh Führungseinrichtung für einen Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffsuspension
DE102009055229A1 (de) 2009-12-23 2011-06-30 Voith Patent GmbH, 89522 Stoffauflauf

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8520836U1 (de) * 1984-08-22 1986-01-02 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Führungsteil für den Stoffauflauf einer Papiermaschine
CA2260725C (fr) * 1998-02-10 2006-06-27 Beloit Technologies, Inc. Vanne de regulation de la plage etendue de debits de bordure pour utilisation dans une caisse de tete de machine a papier
DE19817857A1 (de) * 1998-04-22 1999-10-28 Voith Sulzer Papiertech Patent Turbulenzerzeuger
DE10102087A1 (de) * 2001-01-18 2001-06-13 Voith Paper Patent Gmbh Verfahren und Turbulenzerzeuger eines Stoffauflaufs zur Einstellung der Faserorientierung einer Faserstoffsuspension in einer Papier- oder Kartonmaschine
JP3530499B2 (ja) * 2001-03-19 2004-05-24 三菱重工業株式会社 チューブバンク構造及びフローチューブの製造方法

Also Published As

Publication number Publication date
EP1693507A2 (fr) 2006-08-23
DE102005008269A1 (de) 2006-08-24
ATE440996T1 (de) 2009-09-15
EP1693507A3 (fr) 2006-10-04
DE502006004628D1 (de) 2009-10-08

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