EP0683266B1 - Caisse de tête pour une machine à papier avec addition locale de fluide - Google Patents

Caisse de tête pour une machine à papier avec addition locale de fluide Download PDF

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Publication number
EP0683266B1
EP0683266B1 EP95105978A EP95105978A EP0683266B1 EP 0683266 B1 EP0683266 B1 EP 0683266B1 EP 95105978 A EP95105978 A EP 95105978A EP 95105978 A EP95105978 A EP 95105978A EP 0683266 B1 EP0683266 B1 EP 0683266B1
Authority
EP
European Patent Office
Prior art keywords
headbox
accordance
guide means
openings
admixing
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
EP95105978A
Other languages
German (de)
English (en)
Other versions
EP0683266A1 (fr
Inventor
Alfred Dr. Bubik
Peter Mirsberger
Peter Dr. Drtina
Michael Kochendörfer
Andreas Steidele
Martin Dr. Tietz
Klaus Lehleiter
Harald Hess
Thomas Merath
Robert TRÖNDLE
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 Sulzer Papiermaschinen GmbH
Original Assignee
Voith Sulzer Papiermaschinen 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 DE19944416909 external-priority patent/DE4416909C2/de
Priority claimed from DE4416899A external-priority patent/DE4416899C2/de
Priority claimed from DE19944416898 external-priority patent/DE4416898C2/de
Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0683266A1 publication Critical patent/EP0683266A1/fr
Application granted granted Critical
Publication of EP0683266B1 publication Critical patent/EP0683266B1/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
    • D21F1/022—Means for injecting material into flow within the headbox
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • 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
    • 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
    • D21F1/06—Regulating pulp flow
    • 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
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a headbox for a paper machine according to the preamble of claim 1.
  • German patent specification 40 19 593 C2 shows such a headbox.
  • the fluid is mixed in through inlet openings in the wall of the mixing chamber or directly into the turbulence generator.
  • partition walls are either installed in the mixing chamber or hydraulic means (not specified in more detail) for forming section flows are proposed.
  • the invention has for its object to provide a headbox of the type specified, in which the local admixture of a fluid, for example dilution water, can be carried out to the main flow of the stock suspension in such a way that the admixing is as simple as possible over the entire height of the with simple means Suspension layer can take place and at the same time is easily influenced.
  • a fluid for example dilution water
  • the measures described in the characterizing part of claim 1 make it possible for the first time to enter the fluid to be supplied uniformly in the desired manner over the height of the headbox. This makes it possible to influence the entire sheet subsequently produced on the paper machine, i.e. evenly across the thickness of the sheet. Since the feed devices are located in the mixing chamber, their outer contour can be used to influence the suspension flow flowing in the mixing chamber.
  • the flow state can be changed by simply twisting, which leads to an influence on the total throughput at this point of the headbox.
  • the possibility of influencing the amount of fluid added with respect to the height in the headbox described in further refinements can further improve the quality of the sheet produced, since e.g. Unevenness caused by other sources can be compensated.
  • Another advantage that should not be underestimated is the ease of converting existing headboxes, since they usually have a chamber in front of the last turbulence generator.
  • the pipes in special designs can be attached with their admixing openings in such a way that the fluid streams emerging from them can get directly into a mouth of the downstream guide device.
  • the individual partial suspension jets can thus enter the intermediate chamber be divided up so that when they exit from the intermediate chamber, that is to say when they enter the second guide device, they mix with adjacent partial jets.
  • Such measures create a controlled, locally limited swirl.
  • the fluid to be mixed can advantageously be introduced into the vortex zones thus created.
  • additional locally narrowly limited mixing effects can be generated.
  • the relative speeds between the supplied fluid and the surrounding suspension can be adjusted to a large extent, which results in a good influence on the turbulence and the mixing effect. Under certain circumstances, the need for partitions can be eliminated.
  • the mixing action and the turbulence can be additionally controlled by moving the admixing devices in the direction of the confluence with the turbulence generator.
  • FIG. 1 shows a side view of the section through a headbox according to the invention with a distribution device 1, a first guide device 3, an adjoining mixing chamber 4, and another adjoining it Guide device 2, which opens into a nozzle chamber 8, which forms an outlet gap 5 for the stock suspension.
  • the suspension necessary for paper production will flow through it in the order described.
  • the tube can also have a slight inclination, for example about 10 degrees, against the vertical in order to avoid the occurrence of stagnation points for the suspension flow.
  • the feed device has three admixing openings 7. This feed device 6, which is only indicated schematically here, is supplied with the fluid to be mixed from above via a line 10 and a control valve 11, so that the fluid can be introduced through the three admixing openings 7 into the stock suspension located in the mixing chamber 4.
  • FIG. 2 shows in a similar example in a top view, there are several feed devices 6 across the width of the mixing chamber 4. Their number depends on the requirements of a more or less finely divided influence on the property of the stock suspension.
  • FIG. 2 shows a different shape of the guide devices 2 and 3 compared to FIG. 1.
  • the guide device is provided with step diffusers in one case and a simple perforated plate in the other.
  • the possible variations in this regard are very diverse and depend on the conditions for paper production.
  • Application of the invention is not limited to the forms of guide devices shown here. Although it has been found that highly effective turbulence-generating guiding devices are the preferred field of the invention, the application of the invention is not restricted to the forms of the guiding devices shown here.
  • the distribution devices 1 shown in FIGS. 1 to 3 are cross-flow distributors. However, other possibilities of mass distribution, not shown, are also conceivable, for example a plurality of feed lines which connect the headbox with one Connect the damping container.
  • FIG. 2 Another possibility shown in FIG. 2 for locally influencing the flow conditions is to shift the feed device in or against the flow direction.
  • the headbox according to the invention can also be a multi-layer headbox.
  • FIG. 3 again in plan view, shows feed devices which essentially consist of tubes 6 ', the cross-section of which is not circular but oval. Such devices can be rotated, so that a further influence on the prevailing flow is possible, for example to correct unwanted cross flows.
  • FIGS. 1 and 2 apply to the illustrated guide devices.
  • Fig. 4 shows schematically and in perspective a feed device 6 with a tube 6 'and three admixing openings 7.
  • the tube 6' in this figure has a circular cross-section, a rotary movement according to a curved arrow, the flow cross-section generated by the outer contour in the mixing chamber would only be a little or not at all change, but the direction of flow of the mixed fluid. This also enables a local influence on the flow properties.
  • the size of the admixing opening 7 - as shown in FIG. 6 - can be determined by two concentric, nested tubes 6 'and 6''which are mutually movable and each contain openings, are changed. This results in larger or smaller overlaps of the openings. With elongated holes (not shown) in the inner tube 6 ', the location of the inflow can also be adjusted via the height of the headbox.
  • the embodiment according to FIG. 7 allows different flow rates to be set for the different admixing openings in one and the same feed device 6.
  • the central tube 6 ' is surrounded by a plurality of concentric tubes 6' 'which can be moved, as a result of which the open opening 7 can be changed in each case.
  • a rotary movement can also be used to change the cover instead of the sliding movement, which is normally easier to accomplish in terms of construction.
  • the openings can be changed by varying the degree of coverage when the tubes 6 ', 6' 'which are coaxially inserted into one another are rotated relative to one another.
  • the vertically elongated shape of the openings allows the required angle of rotation to be kept low in order to minimize an undesirable change in the exit direction.
  • the variant of the feed device 6 shown in FIG. 9 also contains a plurality of coaxial tubes which can be moved relative to one another. However, the openings are only in the innermost tube 6 ', so that the outflow size can be adjusted without changing the position or angle of the admixing openings 7.
  • Fig. 11 it can be seen that the invention is not only applicable to an intermediate chamber 4 with a horizontal skin flow direction, but that the main flow can also run obliquely to the horizontal. This alternative depends on the overall structure of the headbox.
  • Fig. 12 indicates that the feed devices 6 can not be arranged perpendicular to the main flow direction in every case, but also in an appropriate inclined position, in particular to prevent the hanging of suspended fibers.
  • This angle of inclination alpha will generally be between 0 and 30 degrees and a maximum of 45 degrees.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)
  • Coating Apparatus (AREA)

Claims (17)

  1. Caisse de tête pour une machine à papier comprenant une installation de distribution (1) pour la suspension de matière, une installation de guidage (2) ayant un grand nombre de canaux, une chambre de mélange (4) en amont de l'installation de guidage (2) avec plusieurs installations d'alimentation (6) réparties transversalement par rapport à la caisse de tête pour un fluide à mélanger ayant des propriétés différentes de celles de la suspension de matière, et une chambre à buse (8) formant un intervalle de sortie (5) pour la suspension-de matière, adjacente à l'installation de guidage (2),
    caractérisée en ce que
    des installations d'alimentation (6) sont réalisées sous la forme de tube (6') placé dans la chambre de mélange (4), et qui comporte plusieurs orifices de mélange (7), superposé, essentiellement perpendiculaire à la direction d'écoulement principal.
  2. Caisse de tête selon la revendication 1,
    caractérisée en ce que
    le tube (6') s'étend dans la chambre de mélange (4) essentiellement perpendiculairement à la direction principale d'écoulement.
  3. Caisse de tête selon la revendication 1,
    caractérisée en ce que
    la ligne médiane du tube (6') présente un angle en biais (alpha) partant d'une position perpendiculaire à la direction principale d'écoulement qui est comprise entre 0 et 45 degrés.
  4. Caisse de tête selon les revendications 1, 2, 3,
    caractérisée en ce que
    le tube (6') a une section différente d'une section de cercle, notamment une section ovale.
  5. Caisse de tête selon les revendications 1, 2, 3,
    caractérisée en ce que
    le tube (6') peut tourner autour de son axe.
  6. Caisse de tête selon les revendications 1, 2, 3, 4, 5
    caractérisée en ce que
    le tube (6') peut coulisser en direction de l'installation de guidage (2) située en aval.
  7. Caisse de tête selon l'une quelconque des revendications précédentes,
    caractérisée en ce qu'
    elle comporte des moyens pour modifier la dimension des orifices d'addition (7),
  8. Caisse de tête selon la revendication 7,
    caractérisée en ce que
    l'installation d'alimentation (6) se compose d'au moins deux tubes (6', 6'') coaxiaux, mobiles, l'un par rapport à l'autre, comportant des ouvertures (7', 7'') dont le recouvrement se modifie en tournant ou en coulissant les deux tubes l'un par rapport à l'autre.
  9. Caisse de tête selon la revendication 8,
    caractérisée en ce que
    le nombre des tubes (6', 6'') concentriques, mobiles l'un par rapport à l'autre correspond au nombre des orifices d'addition (7) d'une installation d'alimentation (6) et en ce que les tubes radialement intérieurs comportent des orifices libérant le passage du fluide vers les orifices des tubes plus à l'extérieur.
  10. Caisse de tête selon l'une des revendications précédentes,
    caractérisée en ce qu'
    elle comporte en amont de la chambre de mélange (4), une autre installation de guidage (3) ayant un grand nombre de canaux.
  11. Caisse de tête selon la revendication 10,
    caractérisée en ce que
    la partie principale du nombre des canaux des installations de guidage (2, 3) est positionnée et dimensionnée pour que les orifices de sortie (13) de la première installation de guidage (3) en amont ne soient pas alignés avec les embouchures (12) de seconde installation de guidage (2) située en aval et en ce que les orifices d'addition (7) pour le fluide à mélanger sont alignés pour que chaque fois leur milieu soit pratiquement aligné avec une embouchure (12) de l'installation de guidage (2) en aval.
  12. Caisse de tête selon la revendication 11,
    caractérisée en ce que
    les orifices d'addition (7) des installations d'alimentation (6) sont alignés pour que la normale de la surface de projection de l'orifice de mélange (7), générée dans la direction de sortie soit chaque fois alignée avec le milieu d'une embouchure (12) de l'installation de guidage (2) en aval.
  13. Caisse de tête selon la revendication 11 ou 12,
    caractérisée en ce que
    la partie principale des orifices de sortie (13) de l'installation de guidage en amont est alignée avec un placement de l'installation de guidage (3) en aval, et qui se trouve entre les embouchures voisines (12).
  14. Caisse de tête selon l'une des revendications précédentes,
    caractérisée en ce que
    l'installation d'alimentation (6) comprend au moins trois orifices d'addition (7), superposés, essentiellement perpendiculaires à la direction principale d'écoulement.
  15. Caisse de tête selon l'une des revendications précédentes,
    caractérisée en ce que
    l'une ou les deux installations de guidage (2, 3) ont des canaux en forme de diffuseurs à échelon dont les sections libres vont en s'élargissant brusquement dans la direction d'écoulement prévue.
  16. Caisse de tête selon l'une des revendications précédentes,
    caractérisée en ce que
    la chambre de mélange (4) est subdivisée par des cloisons qui s'étendent essentiellement dans la direction d'écoulement.
  17. Caisse de tête selon la revendication 16,
    caractérisée en ce que
    le nombre des cloisons correspond à celui des installations d'alimentation (6) diminué d'une unité.
EP95105978A 1994-05-13 1995-04-21 Caisse de tête pour une machine à papier avec addition locale de fluide Expired - Lifetime EP0683266B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE4416898 1994-05-13
DE4416909 1994-05-13
DE4416899 1994-05-13
DE19944416909 DE4416909C2 (de) 1994-05-13 1994-05-13 Stoffauflauf für eine Papiermaschine
DE4416899A DE4416899C2 (de) 1994-05-13 1994-05-13 Verfahren zur lokalen Zumischung von Fluid in einen Stoffauflauf sowie Vorrichtung zu seiner Ausführung
DE19944416898 DE4416898C2 (de) 1994-05-13 1994-05-13 Stoffauflauf für eine Papiermaschine mit lokaler Zumischung von Fluid

Publications (2)

Publication Number Publication Date
EP0683266A1 EP0683266A1 (fr) 1995-11-22
EP0683266B1 true EP0683266B1 (fr) 1997-09-17

Family

ID=27206382

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105978A Expired - Lifetime EP0683266B1 (fr) 1994-05-13 1995-04-21 Caisse de tête pour une machine à papier avec addition locale de fluide

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EP (1) EP0683266B1 (fr)
AT (1) ATE158356T1 (fr)
DE (1) DE59500664D1 (fr)
ES (1) ES2106592T3 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI101726B (fi) * 1997-04-14 1998-08-14 Vaahto Oy Säätövirtausjärjestelmä (menetelmä ja -laite) paperikoneen perälaatiko ssa
DE102008054896A1 (de) * 2008-12-18 2010-07-01 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008054898A1 (de) 2008-12-18 2010-06-24 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008054899A1 (de) * 2008-12-18 2010-06-24 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008054897A1 (de) * 2008-12-18 2010-07-01 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102010028573A1 (de) * 2010-05-05 2011-11-10 Voith Patent Gmbh Mischverfahren
CN105839444B (zh) * 2016-04-12 2018-03-06 陕西科技大学 一种免回流可调锥形布浆器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI66931C (fi) * 1983-01-04 1984-12-10 Tampella Oy Ab Haolskiva foer en inloppslaoda foer en pappersmaskin
US5196091A (en) * 1991-10-29 1993-03-23 Beloit Technologies, Inc. Headbox apparatus with stock dilution conduits for basis weight control
DE9115296U1 (de) * 1991-12-10 1992-03-19 J.M. Voith Gmbh, 7920 Heidenheim Stoffauflauf
DE4213707A1 (de) * 1992-04-25 1993-10-28 Escher Wyss Gmbh Stoffauflaufeinrichtung für eine Papiermaschine

Also Published As

Publication number Publication date
ATE158356T1 (de) 1997-10-15
ES2106592T3 (es) 1997-11-01
EP0683266A1 (fr) 1995-11-22
DE59500664D1 (de) 1997-10-23

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