EP0711869A2 - Caisse de tête à plusieurs couches - Google Patents

Caisse de tête à plusieurs couches Download PDF

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Publication number
EP0711869A2
EP0711869A2 EP95117555A EP95117555A EP0711869A2 EP 0711869 A2 EP0711869 A2 EP 0711869A2 EP 95117555 A EP95117555 A EP 95117555A EP 95117555 A EP95117555 A EP 95117555A EP 0711869 A2 EP0711869 A2 EP 0711869A2
Authority
EP
European Patent Office
Prior art keywords
lamella
headbox according
tip
machine
headbox
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95117555A
Other languages
German (de)
English (en)
Other versions
EP0711869A3 (fr
EP0711869B1 (fr
Inventor
Wolfgang Ruf
Frank Fey
Thomas Dietz
Klaus Pimiskern
Gerhard Wernlein
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 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
Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0711869A2 publication Critical patent/EP0711869A2/fr
Publication of EP0711869A3 publication Critical patent/EP0711869A3/fr
Application granted granted Critical
Publication of EP0711869B1 publication Critical patent/EP0711869B1/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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/09—Uses for paper making sludge
    • Y10S162/10—Computer control of paper making variables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/09—Uses for paper making sludge
    • Y10S162/10—Computer control of paper making variables
    • Y10S162/11—Wet end paper making variables

Definitions

  • the invention relates to a multi-layer headbox with the features specified in the preamble of claim 1. These are known from DE 43 29 810 A1 (file PA05205).
  • the function of the lamella in a multi-layer headbox is to keep the two material flows so separate that no mixing of the different flows takes place, until finally the flows are combined in as undisturbed form as possible into a single flow, with as little interference as possible this flow pattern may occur.
  • Various approaches have been taken to avoid this flow disturbance.
  • the applicant proposed to design the lamella so that there is an increased convergence in the flow channel, so that an increase in the flow velocity in this area results in a reduction in the disturbances due to friction turbulence .
  • the end of the lamella could not be made very sharp for reasons of manufacturing technology, costs and operational safety.
  • a blunt lamella end in turn means that turbulence or periodic detachment of turbulence occurs, and that vibrations are subsequently transmitted to the lamella end or to the entire lamella.
  • This creates disturbances in the formation of the paper web and / or undesirable local mixing of neighboring material flows.
  • the result is that in the finished multi-ply paper, the layers in some places no longer clearly differentiate from each other, e.g. B. in terms of different colors.
  • the strip or strips or strip segments specified in claims 1 to 7 can preferably be produced from a hard ceramic material. Such ceramic strips are free of internal tension, so that the finished slat is extremely dimensionally stable. However, it is also possible to use metals (e.g. titanium) for the strips. In this case, however, mechanical processing is usually required, with the risk that internal stresses arise in the strips or strip segments. The consequence of this may be that the tip area of the finished lamella does not extend straight with the required accuracy.
  • metals e.g. titanium
  • claim 8 states the following: the end region of the main lamella part is given a shape that tapers towards the end, this end region is provided with a coating made of a hard material (for example, a metal sheet) that forms the tip, and then processed End area such that an essentially sharp pointed edge is created. This processing is again preferably carried out by grinding.
  • a coating made of a hard material for example, a metal sheet
  • This processing is again preferably carried out by grinding.
  • FIG. 1 shows a schematic cross section through a two-layer headbox.
  • FIG. 2 is a view of the exit gap of the headbox in the direction of arrow II in FIG. 1.
  • Figures 3 to 8 show different versions of the slat end area in a greatly enlarged representation compared to the natural dimensions, each in cross section.
  • FIG. 1 From a two-layer headbox known per se, essentially only the area of the so-called nozzle chamber can be seen, which leads two machine-wide material flows to an exit gap.
  • the nozzle chamber is delimited by two machine-wide flow guide walls 1 and 1 'and by two side walls 6 and 6', see FIG. 2.
  • the two flow guide walls 1 and 1 ' are each connected to a central stationary partition 7 via a known turbulence generator 5.
  • a lamella 2 is pivotally attached, for example by means of a joint 4. Deviating from this, the lamella 2 can also be rigidly attached to the partition 7.
  • the lamella 2 extends from the joint 4 to the region of the outlet gap or beyond it.
  • FIG. 1 the lamella 2 extends from the joint 4 to the region of the outlet gap or beyond it.
  • the lamella extends over the entire machine width, that is to say directly from one side wall 6 to the other side wall 6 '. Consequently the lamella 2 keeps the two material flows indicated by the arrows 3 and 3 'separated from one another up to the region of the outlet gap. Deviating from FIGS. 1 and 2, a plurality of lamellae can be provided for more than two machine-wide material flows to be separated from one another.
  • the components of the headbox described so far are very precisely manufactured in a known manner, so that the clear width a of the entire outlet gap is uniform over the machine width. If necessary, a locally deformable strip is provided on the wall 1 in order to even out the clear width a of the outlet gap.
  • the lamella 2 and in particular its tapered end which is located in the area of the outlet gap, also very precisely.
  • the tapering fin end must run as straight as possible from one side wall 6 to the other side wall 6 ', and possibly exactly parallel to the outlet ends of the flow guide walls 1 and 1'. It is crucial for achieving high paper quality that the clear widths b and c of the two partial exit gaps are as constant as possible over the entire machine width.
  • FIGS. 3 to 8 This goal is achieved by means of various special configurations of the lamella tip, illustrated as an example in FIGS. 3 to 8.
  • the thickness d of the slat is increased considerably more than the dimensions in the longitudinal direction, for example to clarify the details, for example the length L of the strip 9.3 which forms the tip of the slat according to FIG. So in reality the angle w is the pointed edge much smaller than shown in the drawing. The pointed edge is more like a knife-like edge.
  • the lamella tip is formed from a preformed one or two-part strip 9.3, 9.4 or 9.5.
  • the strip 9.3 is glued into a groove of the main part 8.3 of the lamella by means of an integrally formed web.
  • FIG. 4 shows a reverse example: Here, a web of the main part 8.4 of the lamella projects into a groove in the strip 9.4 forming the tip; this can also be made in two parts, similar to FIG. 5.
  • a thin metal sheet 9.6 is attached to the end of the main lamella part 8.6. Viewed in cross section, the metal sheet 9.6 projects beyond the free end of the main lamella part 8.6; it is by means of mechanical processing, e.g. B. grinding, provided with a sharp pointed edge. In the event of damage, this can be reground. If necessary, the entire slat end can be provided with a uniform inclined surface, e.g. b. Loops along the level S.
  • both sides of the tapering end of the main lamella part 8.7 are provided with a hard outer layer 9.7 and then provided with a sharp pointed edge by grinding along the plane S '.
  • both sides of the tapered end of the main lamella part 8.8 are again coated with thin metal-sheet strips 9.8 and 9.8 'of different widths. It is essential that one metal strip 9.8 'projects beyond the other 9.8 so that this alone forms a sharp pointed edge produced by grinding.
  • the entire lamella is made chemically resistant to a large extent to the material suspension.
  • the outer surfaces of the lamella touched by the fabric have a permanently high level of smoothness, so that fibers or other material particles are reliably prevented from getting caught.
  • the outer surface of the lamella preferably also has smooth transitions from the main part (preferably made of plastic) to the tip. Under certain circumstances, however, a level 10 can also be provided at a transition; see Figure 5.
  • the lamella main part is made of a plastic reinforced with carbon fibers (claim 17).
  • a plastic reinforced with carbon fibers (claim 17).
  • Such a material gives the main part of the slats a very high thermal stability.
  • the shape of the lamella main part remains unchanged even if it comes into contact with (possibly differently) heated fiber suspension streams.
  • the uniformity of the shape of the lamella end is significantly increased, mainly in connection with the lamella tip formed by a relatively thin coating.
  • a locally deformable strip can be provided on one of the current guiding walls 1 or 1 '.
  • Such a bar also called “aperture”
  • aperture has long been known as a tool to even out the basis weight cross profile of the paper web to be produced.
  • problems arise in the production of multilayer paper webs, in particular if emphasis is placed on a cover layer which is as thin as possible and which at the same time should cover the layer underneath very uniformly. If a local deformation of the aperture of the headbox is carried out, the material jet emerging from the headbox is deformed. The thickness of the Influenced outer layer, which should actually remain the same thickness.
  • an orifice adjustment device also means that the headbox nozzle, particularly when used in conjunction with twin-wire formers, cannot be brought close enough to the wire, which means that an undesirably long, unguided material jet has to be accepted , which is particularly noticeable in the case of multilayer papers.
  • lamella which has a sharp pointed edge
  • headbox which has no deformable strip, screen or the like.
  • the nozzle end of the headbox can be designed very simply and therefore requires little effort in terms of production technology.
  • the headbox can be brought very close to the screen or between the screens, which greatly shortens the free jet of fabric and thus further increases the quality of the multilayer paper to be produced.
  • FIG. 9 shows the headbox, which has already been described above with reference to FIG. 1, together with a schematically illustrated line system for feeding various fiber suspensions.
  • a first main material stream consisting of a first type of paper stock, reaches a one of the two turbulence generators 5 via a cross distribution line 11 and a branched branch row of section feed lines 13.
  • a second main stock stream consisting of another type of paper stock, reaches a cross distribution line 12 and over a branched series of sectional Feed lines 14, 14 'to the other turbulence generator 5.
  • a third cross distribution line 15 is provided for feeding a so-called secondary material flow. This consists, for. B.
  • a plurality of sectional supply lines 16, each with a control valve 17, are branched off from the transverse distribution line 15.
  • Each of the lines 16 thus leads a controllable sectional secondary material flow to a mixing point 18, where it is mixed with one of the sectional main material flows.
  • further feed lines for individually controllable sectional secondary material flows could open into the sectional feed lines 13 for the first main material flow.

Landscapes

  • Paper (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)
  • Magnetic Heads (AREA)
EP95117555A 1994-11-10 1995-11-08 Caisse de tête à plusieurs couches Expired - Lifetime EP0711869B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4440079A DE4440079C2 (de) 1994-11-10 1994-11-10 Mehrschichten-Stoffauflauf
DE4440079 1994-11-10

Publications (3)

Publication Number Publication Date
EP0711869A2 true EP0711869A2 (fr) 1996-05-15
EP0711869A3 EP0711869A3 (fr) 1997-04-16
EP0711869B1 EP0711869B1 (fr) 2002-03-27

Family

ID=6532917

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117555A Expired - Lifetime EP0711869B1 (fr) 1994-11-10 1995-11-08 Caisse de tête à plusieurs couches

Country Status (4)

Country Link
US (1) US5645689A (fr)
EP (1) EP0711869B1 (fr)
AT (1) ATE215144T1 (fr)
DE (2) DE4440079C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT406171B (de) * 1998-02-05 2000-03-27 Andritz Patentverwaltung Vorrichtung zur zufuhr einer faserstoffsuspension auf eine entwässerungseinrichtung
EP1365067A1 (fr) * 2002-05-25 2003-11-26 Voith Paper Patent GmbH Section de formage
EP0939842B2 (fr) † 1996-06-12 2006-06-28 Metso Paper Karlstad Aktiebolag Caisse de tete multicouche destinee a une machine de fabrication de papier
EP1798337A1 (fr) * 2004-10-05 2007-06-20 Mitsubishi Heavy Industries, Ltd. Feuille de coulee pour machine a papier et son procede de fabrication
WO2021063556A1 (fr) * 2019-09-30 2021-04-08 Voith Patent Gmbh Lamelle pour une caisse de tête et procédé de fabrication d'une lamelle

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0681057B1 (fr) * 1994-04-29 2002-08-28 Voith Paper Patent GmbH Caisse de tête à plusieurs couches
US6146501A (en) * 1997-12-15 2000-11-14 Kimberly Clark Worldwide Cross-machine direction stiffened dividers for a papermaking headbox
AT406172B (de) * 1998-02-05 2000-03-27 Andritz Patentverwaltung Vorrichtung zur zufuhr einer faserstoffsuspension auf eine entwässerungseinrichtung
DE10051802A1 (de) * 2000-10-18 2002-04-25 Voith Paper Patent Gmbh Lamelle eines Stoffauflaufs einer Papier-, Karton- oder Tissuemaschine
DE10106684A1 (de) * 2001-02-14 2002-08-29 Voith Paper Patent Gmbh Lamelle eines Stoffauflaufs einer Papier-, Karton- oder Tissuemaschine
DE10133552A1 (de) * 2001-07-11 2003-01-23 Voith Paper Patent Gmbh Lamelle eines Stoffauflaufs einer Papier- oder Kartonmaschine
DE10256510A1 (de) * 2002-12-04 2004-06-24 Voith Paper Patent Gmbh Stoffauflauf einer Papier- oder Kartonmaschine zur Herstellung einer Faserstoffbahn
DE10326304A1 (de) * 2003-06-11 2005-02-03 Voith Fabrics Patent Gmbh Verfahren und Vorrichtung zur Herstellung einer Tissuebahn
US8057567B2 (en) 2004-11-05 2011-11-15 Donaldson Company, Inc. Filter medium and breather filter structure
US8021457B2 (en) 2004-11-05 2011-09-20 Donaldson Company, Inc. Filter media and structure
RU2389529C2 (ru) 2004-11-05 2010-05-20 Дональдсон Компани, Инк. Фильтрующий материал (варианты) и способ фильтрации (варианты)
EP1846136A2 (fr) 2005-02-04 2007-10-24 Donaldson Company, Inc. Separateur aerosol et procede correspondant
EP1858618B1 (fr) * 2005-02-22 2009-09-16 Donaldson Company, Inc. Separateur d aerosol
FI20065639L (fi) * 2006-10-05 2008-04-06 Metso Paper Inc Paperikoneen tai vastaavan perälaatikon lamelli
EP2117674A1 (fr) 2007-02-22 2009-11-18 Donaldson Company, Inc. Élément filtrant et procédé associé
WO2008103821A2 (fr) 2007-02-23 2008-08-28 Donaldson Company, Inc. Élément de filtre formé
DE102007036535A1 (de) 2007-08-02 2009-02-05 Voith Patent Gmbh Stoffauflauf einer Maschine zur Herstellung einer mehrschichtigen Faserstoffbahn
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
US8267681B2 (en) 2009-01-28 2012-09-18 Donaldson Company, Inc. Method and apparatus for forming a fibrous media
EP2668327B1 (fr) 2011-01-28 2016-10-12 Donaldson Company, Inc. Procédé et installation pour la fabrication d'un corps fibreux
US9121118B2 (en) 2011-01-28 2015-09-01 Donaldson Company, Inc. Method and apparatus for forming a fibrous media
US8877011B2 (en) 2011-05-11 2014-11-04 Hollingsworth & Vose Company Systems and methods for making fiber webs
WO2013016515A1 (fr) 2011-07-27 2013-01-31 Hollingsworth & Vose Company Systèmes et procédés pour réaliser des bandes fibreuses
EP2736713B1 (fr) 2011-07-27 2019-06-26 Hollingsworth & Vose Company Procédé et système pour réaliser des bandes fibreuses
MX2021002367A (es) 2018-10-01 2021-08-16 Outlier Solutions Llc Productos de papel aislado y repulpable, metodos para fabricarlos y usarlos.
WO2021067355A1 (fr) 2019-10-01 2021-04-08 Outlier Solutions Llc Appareil, systèmes et procédés de fabrication de produits en papier isolés retriturables

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DE4323263A1 (de) 1993-07-12 1994-01-13 Voith Gmbh J M Stoffauflauf einer Papiermaschine
DE4329810A1 (de) 1993-09-03 1994-06-23 Voith Gmbh J M Geometrie des Lamellenendes eines Stoffauflaufes
DE4323050C1 (de) 1993-07-12 1995-02-16 Voith Gmbh J M Düse eines Mehrschichtenstoffauflaufes und Verfahren zum vermischungsarmen Zusammenführen mindestens zweier Stoffsuspensionsströme

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DE4211291A1 (de) 1992-04-03 1993-10-07 Voith Gmbh J M Mischeinrichtung zum Mischen von zwei Flüssigkeiten bei konstantem Gemischvolumenstrom zur Versorgung des Stoffauflaufs einer Papiermaschine
DE4323263A1 (de) 1993-07-12 1994-01-13 Voith Gmbh J M Stoffauflauf einer Papiermaschine
DE4323050C1 (de) 1993-07-12 1995-02-16 Voith Gmbh J M Düse eines Mehrschichtenstoffauflaufes und Verfahren zum vermischungsarmen Zusammenführen mindestens zweier Stoffsuspensionsströme
DE4329810A1 (de) 1993-09-03 1994-06-23 Voith Gmbh J M Geometrie des Lamellenendes eines Stoffauflaufes

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0939842B2 (fr) † 1996-06-12 2006-06-28 Metso Paper Karlstad Aktiebolag Caisse de tete multicouche destinee a une machine de fabrication de papier
AT406171B (de) * 1998-02-05 2000-03-27 Andritz Patentverwaltung Vorrichtung zur zufuhr einer faserstoffsuspension auf eine entwässerungseinrichtung
EP1365067A1 (fr) * 2002-05-25 2003-11-26 Voith Paper Patent GmbH Section de formage
EP1798337A1 (fr) * 2004-10-05 2007-06-20 Mitsubishi Heavy Industries, Ltd. Feuille de coulee pour machine a papier et son procede de fabrication
EP1798337A4 (fr) * 2004-10-05 2009-02-18 Toray Industries Feuille de coulee pour machine a papier et son procede de fabrication
US7785446B2 (en) 2004-10-05 2010-08-31 Toray Industries, Inc. Flow sheet for paper machine and method of manufacturing the same
WO2021063556A1 (fr) * 2019-09-30 2021-04-08 Voith Patent Gmbh Lamelle pour une caisse de tête et procédé de fabrication d'une lamelle
CN114555882A (zh) * 2019-09-30 2022-05-27 福伊特专利有限公司 用于流浆箱的片板和用于制造片板的方法
CN114555882B (zh) * 2019-09-30 2024-06-07 福伊特专利有限公司 用于流浆箱的片板和用于制造片板的方法

Also Published As

Publication number Publication date
DE4440079A1 (de) 1996-05-23
EP0711869A3 (fr) 1997-04-16
DE59510123D1 (de) 2002-05-02
US5645689A (en) 1997-07-08
DE4440079C2 (de) 1997-10-02
EP0711869B1 (fr) 2002-03-27
ATE215144T1 (de) 2002-04-15

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DE202009005580U1 (de) Stoffauflaufdüse

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