EP1022378B1 - Caisse de tête - Google Patents

Caisse de tête Download PDF

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Publication number
EP1022378B1
EP1022378B1 EP99118677A EP99118677A EP1022378B1 EP 1022378 B1 EP1022378 B1 EP 1022378B1 EP 99118677 A EP99118677 A EP 99118677A EP 99118677 A EP99118677 A EP 99118677A EP 1022378 B1 EP1022378 B1 EP 1022378B1
Authority
EP
European Patent Office
Prior art keywords
section
headbox
length
cross
path section
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
EP99118677A
Other languages
German (de)
English (en)
Other versions
EP1022378A3 (fr
EP1022378A2 (fr
Inventor
Alfred Dr. Bubik
Joachim Henssler
Jürgen Prössl
Karl Müller
Walter Dr. Holzer
Mathias Schwaner
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1022378A2 publication Critical patent/EP1022378A2/fr
Publication of EP1022378A3 publication Critical patent/EP1022378A3/fr
Application granted granted Critical
Publication of EP1022378B1 publication Critical patent/EP1022378B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • a headbox is according to the preamble of claim 1 known from the applicant's US patent US 5,599,428.
  • different variants of Multi-layer headboxes described in the nozzle area are equipped with separating blades of different types.
  • the inventors have recognized that the transverse rigidity of the Paper significantly improved, if by an appropriate Shape of the headbox nozzles - especially in the end area the headbox nozzle - ensure that the in the stock of fibers in the end area of the Nozzle reinforced in the perpendicular to the leaf surface z-direction rotated and if possible also stretched.
  • the known headbox of a paper machine with at least one material suspension supply system, at least one subsequent area for Turbulence generation and a headbox nozzle with a first and a second machine-wide boundary wall to further develop, wherein the headbox nozzle a first Has path I in which the total cross section - that is, the total free suspension Cross-sectional area of the headbox in the respective Machine section - the headbox nozzle continuously and continuously decreased, immediately following the first route I a second, shorter route II followed.
  • the further development of the Headbox is that the second leg II a continuously expanding overall cross-section has that up to the end of the headbox nozzle extends.
  • the additional has a third route III, which follows the second route II connects and to the end of Headbox nozzle is sufficient.
  • the improvement is here in that the second route II a continuously widening overall cross section and the Total cross-section of the third route III is stepless and continuously decreased. It is advantageous here if the length L3 of the third distance is shorter than that Length L2 of the second route and length L2 of the second The distance is shorter than the length L1 of the first Distance.
  • Headbox provides that the first route I starts immediately after the turbulence generating area. It is also proposed that at least part of the Headbox nozzle length of the total cross section of the Headbox nozzle through a single suspension channel is formed. That means there are none in this area Separating elements - for separating individual layers - available are. This reduces edge effects, and the on one piece of available amount of Flow cross section corresponds to the total cross section, resulting in better alignment of the fibers in the z direction can be achieved.
  • the headbox is a multi-layer headbox is used, it can be advantageous if the total cross section of the headbox nozzle, at least over part of the headbox nozzle length, several Has suspension channels through at least one machine-wide separating element are formed, the at least one separating element between the first and the second boundary wall is arranged.
  • all without exception Suspension channels have the same cross-sectional shape, the same acceleration and acceleration in every suspension channel Delay ratios for the running suspension given are.
  • it is advantageous if without exception all suspension channels are congruent - also mirror image congruent - have shape. hereby is achieved not only the amount of acceleration and delay in the suspension channels is the same, but also that the vector field in each suspension channel is identical over the entire length.
  • Another advantageous embodiment provides that the degree the divergence in the area of the second route II for everyone Suspension channels is the same.
  • the divergence of the individual suspension channels can for example with internal separators achieved that the separating elements in the area of the second Route II have a taper.
  • the degree of convergence of the surfaces of the tapered ends of all separators is the same to flow conditions as uniform as possible over the To reach cross-section of the headbox.
  • Headbox provides that the headbox has a Turbulence generator with a variety of diffusion tubes has, the diffusion tubes in machine width trending rows are arranged and the dividing elements start between the rows of diffusion tubes.
  • the top and bottom wall of the Headbox be of equal length.
  • Figures 1 to 8 show to illustrate the Invention concept highly schematic longitudinal sections in Machine direction through a headbox nozzle, following a turbulence generating area up to the outlet gap of the Headbox.
  • Figure 1 shows the simplest variant of a Nozzle area of a headbox according to the invention an upper wall 1 and an opposite lower wall 2, between which a suspension channel 4 is formed.
  • the Headbox nozzle has two paths I and II with fundamentally different flow situations.
  • the Distance I represents the distance in which the entire free cross section for the material suspension flow itself continuously reduced to the end of the route and thus an acceleration of the stock suspension in Flow direction causes.
  • Subsequent to the first Route I follows the second route II, in which one Reversal of the acceleration, i.e. a deceleration of the flow takes place, due to the divergent form of Suspension channel in this area an alignment of the Fibers that are in the stock suspension in the z direction is effected.
  • FIG. 2 shows a headbox nozzle with the top wall 1 and the lower wall 2, the course of which is shown in FIG corresponds, in addition, between the top wall 1 and Two dividing elements 3.1 and 3.2 inserted in the lower wall 2.
  • the Separating elements 3.1 and 3.2 also show one in Flow direction converging arrangement, so that three Suspension channels 4.1 to 4.3 arise, on the one hand via the entire route I each converge, on the other hand also in the sum of the available ones Cross sections (total cross section) over the entire distance I show convergence.
  • the separator-free route II which is due to the here divergent top and bottom wall 1 and 2 formed and thus a delay in the material suspension flow effected on this second route II.
  • all areas of the invention Headbox in which there is a delay in the stock suspension is caused are designed such that no additional Turbulence caused by paragraphs occurs only in this way an orientation of the fibers of the stock suspension in the z direction is achieved.
  • FIG. 3 shows a variant of the headbox nozzle from the Figure 2 shown, the difference to Figure 2, the two separators 3.1 and 3.2 in the area of the second Project route II.
  • the separators 3.1 and 3.2 can be trained very flexibly, so that an adaptation of the lamella shape to the divergence of the second Area II results, and therefore due to the total in downstream cross-sectional enlargement also Cross-sectional profile of the individual substance suspension channels 4.1 to 4.3, which expands downstream.
  • the separating elements 3.1 and 3.2 in the divergent area of the second route II is brought about that the targeting effect of the flow retardant Area is reduced, as in each suspension channel Available space conditions are somewhat smaller and full height only in the end area of the second route II is available.
  • FIG. 4 shows a continuation of the headbox nozzle of Figure 1. There are none in this embodiment Partitions between the top and bottom walls 1 and 2 available.
  • the first and the second route I and II correspond to the version from Figure 1. Following the route II is arranged a third route III, in which a short convergent line is appended, the is only used for beam stabilization, but due to their significantly shorter exposure time - in contrast to second route II - the originally existing aligning effect of the fibers in the z direction from the second Route II not fully compensated.
  • Figure 5 shows a headbox nozzle in its shape corresponds to the headbox nozzle of Figure 1, being inside the headbox nozzle has a relatively solid separating element 3 is arranged.
  • the separating element 3 points from the beginning of the Route I to a continuous and even taper up to the slat end, which is behind the nozzle outlet gap is arranged on.
  • the degree of rejuvenation of this Separating element 3 is chosen such that the convergence between top and bottom wall 1 and 2 in the area of the first Path I turns out larger than the convergence of the Separator element surfaces, so that a total of two Suspension channels 4.1 and 4.2 arise, which cover the entire first path I experience convergence.
  • the divergent route II the is created by the top and bottom walls on this part the headbox nozzle are designed to diverge.
  • top and Bottom wall 1 and 2 in the area of the second route II run in parallel so that the divergence of the two Suspension channels and thus also the total cross section only due to the taper of the separating lamella 3 in this area is generated.
  • FIG. 6 there is again a headbox nozzle with top and bottom Bottom wall 1 and 2 shown, the shape of the Headbox nozzle from Figure 1 corresponds.
  • the three suspension channels 4.1 to 4.3 form.
  • the separators 3.1 and 3.2 have the entire area of the first path I the same thickness on and are arranged converging overall. To this In this way, three suspension channels 4.1 to 4.3 emerge, which over converge the entire length of the first path.
  • the subsequent area of the second route II have the two separating elements on the opposite one another Surfaces a kink with a subsequent taper on, while the outwardly facing surfaces of the Separating elements have a linear linear course.
  • FIG. 7 A similar design of the headbox nozzle is in the Figure 7 shown.
  • the difference to Figure 6 is that here the two separators 3.1 and 3.2 in the course of second route II are tapered on both sides.
  • the history the top and bottom wall 1 and 2 of the headbox nozzle is in second area II executed in parallel, so that the divergence of the fabric suspension channels 4.1 to 4.3 exclusively through the tapering of the separating elements 3.1 and 3.2 arises.
  • Figure 8 shows a headbox in its Execution over the first and second routes I and II Headbox from Figure 7 corresponds, but is additional a subsequent route III available, in the Stabilization of the free jet a short-term strong Contraction of the stock suspension jet by one another tapering sections of the top and bottom wall 1 and 2 is produced.
  • Figures 9 and 10 illustrate the effect a flow delay on the orientation of a fiber F, which extends between the two points A and B, effect.
  • FIG. 9 shows two snapshots at time t 1 and at time t 2 for a fiber F which changes from a continuous flow into a divergent, braked flow.
  • the two boundary points A and B of the fiber F have a uniform speed V a1 and V b1 , the speed vector of which is directed exclusively towards the front.
  • the flow has additional speed components in the z direction due to the divergent course, while the speed of the fibers is also greatly reduced in accordance with the continuity equation due to the larger cross section available becomes.
  • points A and B are brought closer together in terms of their distance in the direction of flow, while points A and B drift apart in the z direction. This type of movement creates an elongation and orientation of the fiber F between the points A and B in the z direction. This leads to an improvement in the transverse stiffness of the paper produced.
  • FIG. 10 shows the same situation again on a coordinate cross with the x and z axes, the snapshots at time t 1 and t 2 being shown in each case.

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  • Paper (AREA)
  • Coating Apparatus (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Claims (24)

  1. Caisse de tête d'une machine à papier comprenant au moins un système d'alimentation de suspension de matière, éventuellement avec au moins une région pour la production de turbulences et une buse de caisse de tête placée après avec une première et une deuxième paroi de limitation à la largeur de la machine, la buse de caisse de tête présentant une première distance I dans laquelle la section transversale totale, c'est-à-dire la surface en section transversale libre totale parcourue par la suspension, de la buse de caisse de tête se réduit sans gradation et de manière continue, une deuxième distance II plus courte se raccordant directement à la première distance I, caractérisée en ce que la deuxième distance II présente une section transversale total s'élargissant, de préférence de manière continue, qui s'étend jusqu'à l'extrémité de la buse de caisse de tête.
  2. Caisse de tête selon le préambule de la revendication 1, dans laquelle une troisième distance III se raccorde directement à la deuxième distance II et s'étend jusqu'à l'extrémité de la buse de caisse de tête, caractérisée en ce que la deuxième distance II présente une section transversale totale s'élargissant de manière continue et la section transversale totale de la troisième distance III se réduit sans gradation et de manière continue.
  3. Caisse de tête selon la revendication 2 précédente, caractérisée en ce que la longueur L3 de la troisième distance III est plus courte que la longueur L2 de la deuxième distance II et la longueur L2 de la deuxième distance II est plus courte que la longueur L1 de la première distance I.
  4. Caisse de tête selon la revendication 3 précédente, caractérisée en ce que l'on a : L2*0,3 < L3 < L2*0,7 et L1*0,1 < L2 < L1*0,3.
  5. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que la première distance I commence immédiatement après la région de turbulences.
  6. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que la section transversale totale de la buse de caisse de tête est formée, au moins sur une partie de la longueur de la buse de caisse de tête, par un canal de suspension unique.
  7. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que la section transversale totale de la buse de caisse de tête présente, au moins sur une partie de la longueur de la buse de caisse de tête, plusieurs canaux de suspension qui sont formés par au moins un élément de séparation à la largeur de la machine, l'au moins un élément de séparation étant disposé entre la première et la deuxième paroi de limitation.
  8. Caisse de tête selon la revendication 7 précédentes, caractérisée en ce que tous les canaux de suspension sans exception présentent la même allure en section transversale.
  9. Caisse de tête selon l'une quelconque des revendications précédentes 7 à 8, caractérisée en ce que tous les canaux de suspension sans exception présentent une forme égale.
  10. Caisse de tête selon l'une quelconque des revendications précédentes 7 à 9, caractérisée en ce que le degré de divergence dans la région de la deuxième distance II est identique pour tous les canaux de suspension.
  11. Caisse de tête selon l'une quelconque des revendications précédentes 7 à 10, caractérisée en ce que les éléments de séparation présentent une forme effilée dans la région de la deuxième distance II.
  12. Caisse de tête selon la revendication 11 précédentes, caractérisée en ce que le degré de convergence des surfaces des extrémités de forme effilée de tous les éléments de séparation est le même.
  13. Caisse de tête selon l'une quelconque des revendications précédentes 7 à 12, caractérisée en ce que l'allure de la paroi supérieure et/ou de la paroi inférieure au moins dans la deuxième région II par rapport à la surface en contact avec la suspension, est réalisée avec une symétrie spéculaire par rapport à l'allure de la surface de l'élément de séparation voisin.
  14. Caisse de tête selon l'une quelconque des revendications précédentes 7 à 13, caractérisée en ce que la caisse de tête présente un générateur de turbulences avec une pluralité de tubes de diffusion, les tubes de diffusion étant disposé en rangées s'étendant sur la largeur de la machine et les éléments de séparation commençant entre les rangées des tubes de diffusion.
  15. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que la paroi supérieure et la paroi inférieure de la caisse de tête sont réalisées de même longueur.
  16. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que le rapport de contraction ΔH/ΔL, c'est-à-dire la variation de la hauteur en section transversale diminuant dans la direction de l'écoulement par rapport à la longueur du trajet, est compris, dans la région de la première distance I, entre 0,3% et 40%, de préférence entre 10% et 30%.
  17. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que le rapport de divergence ΔH/ΔL, c'est-à-dire la variation de la hauteur en section transversale augmentant dans la direction de l'écoulement par rapport à la longueur du trajet, est compris, dans la région de la deuxième distance II, entre 0,1% et 20%, de préférence entre 2% et 12%.
  18. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que le rapport de contraction ΔH/ΔL, c'est-à-dire la variation de la hauteur en section transversale diminuant dans la direction de l'écoulement par rapport à la longueur du trajet, est compris, dans la région de la troisième distance III, entre 1 % et 400%, de préférence entre 10% et 200%.
  19. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que la première distance I mesure de 250 mm à 1000 mm, de préférence de 400 mm à 800 mm de long.
  20. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que la deuxième distance II mesure 20 mm à 150 mm de long.
  21. Caisse de tête selon l'une quelconque des revendications précédentes 2 à 20, caractérisée en ce que la troisième distance III mesure de 0,5 mm à 300 mm, de préférence de 1 mm à 100 mm de long.
  22. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que la plus petite hauteur en section transversale totale de la première distance I vaut de 10 mm à 500 mm, de préférence de 15 mm à 150 mm.
  23. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que la plus grande hauteur en section transversale totale de la deuxième distance II vaut de 30 mm à 200 mm.
  24. Caisse de tête selon l'une quelconque des revendications précédentes 2 à 23, caractérisée en ce que la plus petite hauteur en section transversale totale de la troisième distance III vaut de 5 mm à 80 mm.
EP99118677A 1999-01-23 1999-09-22 Caisse de tête Expired - Lifetime EP1022378B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19902623A DE19902623A1 (de) 1999-01-23 1999-01-23 Stoffauflauf
DE19902623 1999-01-23

Publications (3)

Publication Number Publication Date
EP1022378A2 EP1022378A2 (fr) 2000-07-26
EP1022378A3 EP1022378A3 (fr) 2000-11-22
EP1022378B1 true EP1022378B1 (fr) 2003-12-17

Family

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Family Applications (1)

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EP99118677A Expired - Lifetime EP1022378B1 (fr) 1999-01-23 1999-09-22 Caisse de tête

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US (1) US6372092B1 (fr)
EP (1) EP1022378B1 (fr)
AT (1) ATE256781T1 (fr)
DE (2) DE19902623A1 (fr)

Families Citing this family (13)

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Publication number Priority date Publication date Assignee Title
DE10106684A1 (de) * 2001-02-14 2002-08-29 Voith Paper Patent Gmbh Lamelle eines Stoffauflaufs einer Papier-, Karton- oder Tissuemaschine
DE10256510A1 (de) * 2002-12-04 2004-06-24 Voith Paper Patent Gmbh Stoffauflauf einer Papier- oder Kartonmaschine zur Herstellung einer Faserstoffbahn
SE526405C2 (sv) * 2004-01-16 2005-09-06 Metso Paper Inc Sätt och anordning för tvärfördelning av ett strömmande medium
US7875192B2 (en) * 2006-12-20 2011-01-25 Carter Day International, Inc. Slurry flow divider
DE102008043145A1 (de) * 2008-10-24 2010-04-29 Voith Patent Gmbh Zweischichtenstoffauflauf für eine Maschine zur Herstellung einer zweischichtigen Faserstoffbahn
EP2199459A1 (fr) * 2008-12-16 2010-06-23 Voith Patent GmbH Système de formation de feuille pour une machine destinée à la fabrication d'une bande de matière fibreuse multicouche
DE102009028389A1 (de) 2009-08-10 2011-02-17 Voith Patent Gmbh Stoffauflauf, Blattbildungseinheit mit einem Stoffauflauf und Verfahren zum Betreiben einer Blattbildungseinheit
DE102009028385A1 (de) 2009-08-10 2011-02-17 Voith Patent Gmbh Verfahren zum Betreiben einer Blattbildungseinheit und Blattbildungseinheit
DE102010001614A1 (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
DE102010001615A1 (de) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
DE102010001610A1 (de) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
BR112022022805A2 (pt) * 2020-05-29 2023-01-17 Kimberly Clark Co Caixa de entrada para fabricação de um substrato

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US3038538A (en) * 1958-05-28 1962-06-12 Kenneth C Logan Paper machine headbox
CA975597A (en) * 1972-06-20 1975-10-07 Ramamurthy G. Krishnan Headbox for paper machine
GB1431603A (en) * 1973-11-26 1976-04-14 Wiggins Teape Ltd Forming non-woven fibrous material
SE446889B (sv) * 1980-08-05 1986-10-13 Mitsubishi Heavy Ind Ltd Inloppslada vid en pappersmaskin
US4604164A (en) * 1985-01-30 1986-08-05 Mitsubishi Jukogyo Kabushiki Kaisha Flow restraining elements in the headbox of a paper machine
US4971659A (en) * 1990-01-29 1990-11-20 Hiroshi Takeuchi Head box with reducing stream gate
DE4005147A1 (de) 1990-02-17 1991-08-29 Voith Gmbh J M Verfahren und vorrichtung zum bilden einer faserstoffbahn
DE4239644C2 (de) * 1992-11-26 1994-10-27 Voith Gmbh J M Stoffauflauf einer Papiermaschine mit Welleneinsatz
DE4307143C2 (de) * 1993-03-06 1998-02-05 Voith Gmbh J M Mehrschichtenstoffauflauf
DE4323050C1 (de) * 1993-07-12 1995-02-16 Voith Gmbh J M Düse eines Mehrschichtenstoffauflaufes und Verfahren zum vermischungsarmen Zusammenführen mindestens zweier Stoffsuspensionsströme

Also Published As

Publication number Publication date
US6372092B1 (en) 2002-04-16
EP1022378A3 (fr) 2000-11-22
EP1022378A2 (fr) 2000-07-26
DE59908101D1 (de) 2004-01-29
DE19902623A1 (de) 2000-07-27
ATE256781T1 (de) 2004-01-15

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