EP1452640A2 - Caisse de tête - Google Patents

Caisse de tête Download PDF

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Publication number
EP1452640A2
EP1452640A2 EP04100605A EP04100605A EP1452640A2 EP 1452640 A2 EP1452640 A2 EP 1452640A2 EP 04100605 A EP04100605 A EP 04100605A EP 04100605 A EP04100605 A EP 04100605A EP 1452640 A2 EP1452640 A2 EP 1452640A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
lamella
headbox
approximately
headbox according
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.)
Ceased
Application number
EP04100605A
Other languages
German (de)
English (en)
Other versions
EP1452640A3 (fr
Inventor
Wolfgang Ruf
Hans Loser
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 EP1452640A2 publication Critical patent/EP1452640A2/fr
Publication of EP1452640A3 publication Critical patent/EP1452640A3/fr
Ceased 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

Definitions

  • the invention relates to a headbox with a nozzle, the interior of which at least is subdivided in areas by at least one lamella that extends outwards viewed from the inlet end of the nozzle in the direction of flow into the Extends nozzle area.
  • a headbox is used to create a machine width Suspension jet in a manufacturing a material web Machine. It can happen with the material web formed from the suspension especially a paper or cardboard web. Headboxes for one such paper or board manufacture are, for example, in the following Publications described: US 3,923,593, US 4,141,788, US 5,133,836, DE 199 62 709 A1, EP 0 708 201 A1, DE 42 41 076 C2, DE 43 29 810 A1 and DE 43 23 050 C1.
  • lamellas it is known to use lamellas to improve paper properties.
  • the fins have a great influence on the jet properties and the turbulence character the free jet delivered by the relevant headbox, again important paper properties such as formation, RLV (tear length ratio), Flat lay, porosity, surface gloss (tiger stripes, snail tracks) certainly.
  • a defined jet quality is a prerequisite for optimal paper quality, where slats can be an important tool.
  • slat headboxes There are Different types of slat headboxes are known, depending on the manufacturer and the respective application. The respective slat lengths depend on the slat geometry and specifically on the design the slat tip. There are both headboxes with lamellae of the same length also known headboxes with slats of different lengths.
  • An object of the invention is to provide an improved headbox of the type mentioned Kind of creating one with a view to high end product quality optimal free jet is generated.
  • this object is achieved by that a combination of at least one longer and at least one shorter Slat is provided, with a respective longer slat in one area from about 90% to about 120% and a respective shorter slat in one Range from about 40% to about 90% of the starting from the entry side Nozzle end measured nozzle length ends, and that in the direction of flow looks at the rear end of a longer slat with a structured one Surface and / or is provided with a particularly sharp tip.
  • a respective longer slat preferably ends in a range of approximately 90% up to about 99% of the nozzle length.
  • a respective shorter slat preferably ends in a range of approximately 55% up to about 90% of the nozzle length.
  • At least one lamella is advantageously over a hinge-like one, for example Lamella bracket articulated to a turbulence generator.
  • a such hinge-like slat holder is for example from the German Publication DE 199 62 709 A1 known.
  • the lamella joint connection can also be used for example, be provided as in this Document DE 199 62 709 A1 is described, which are hereby incorporated in the present application is involved.
  • the headbox is preceded by a turbulence generator or insert, which has a plurality of channels, the boundary surfaces of which are turbulent have generating surface structure, with a respective channel in one Cross-section perpendicular to the direction of flow considered at least twice long how wide is.
  • a turbulence insert is, for example, from the European one Patent application EP 0 708 201 A1 known.
  • the Turbulence insert in question be carried out as described in this document EP 0 708 201 A1 is described, which is hereby also included in the present application is involved.
  • the slats advantageously each have a thickness in a range of about 2 to about 6 mm.
  • at least one lamella is preferably provided, that in the area of its rear end viewed in the direction of flow with a plurality of slots or the like is provided.
  • Such a slat tip is for example from the German published application DE 43 29 810A1 known.
  • a respective lamella tip can also do the rest, for example be carried out as described in this document DE 43 29 810 A1, which is hereby incorporated into the present application.
  • the use of fins as separators in the nozzle is known. Another It is possible to separate the individual nozzle areas from solid metal partitions.
  • the multi-layer headboxes available on the market are regarding the headbox hydraulics and especially regarding the suitability of the free jet is not suitable for multilayer sheet formation, because either through the flow in the turbulence insert or in the nozzle there is too much turbulence. This leads to mixing of the individual Layers in the free jet and in the sheet formation area. That is also the case The quality of the multilayer product obtained is unsatisfactory.
  • Another object of the invention is therefore to provide an improved headbox to create the optimal conditions for a Multilayer sheet formation entails.
  • the headbox is designed as a multi-layer headbox by the nozzle space divided into at least two partial nozzle spaces by at least one separating lamella is that a combination of at least one longer separation lamella and at least one shorter slat is provided, with a respective longer one Separating lamella in a range from about 90% to about 120% and each shorter slat in a range from about 40% to about 90% of the outgoing ends of the nozzle length measured from the inlet end of the nozzle, and that the rear end, viewed in the direction of flow, of a respective longer one Separating lamella with a structured surface and / or with a particular one sharp point is provided.
  • each has a longer one Separating lamella has a higher rigidity or strength than a respective shorter lamella.
  • the slats as a tool to control the beam properties are used, there is a defined beam quality and thus a high quality of the end product obtained.
  • the stiffness or strength of the various slats will meet the hydraulic requirements taken into account in operation. So the separating lamellae in particular several times more stable than the shorter intermediate slats his. For example, different ones can be used for the different slats Materials are used.
  • a respective longer separating lamella can be made of a fiber composite material or consist of CFRP.
  • CFRP CFRP
  • a respective longer separating lamella preferably ends in a range of approximately 95% to about 105% of the nozzle length.
  • a respective shorter slat preferably ends in a range of approximately 55 % to about 90% of the nozzle length.
  • Another object of the invention is therefore to provide an improved headbox to create the type mentioned, in terms of an articulation an optimal compromise in terms of manufacturing technology and hydraulics is realized.
  • this object is achieved by that at least one slat has a hinge-like slat holder, for example articulated with a turbulence generator or generator upstream of the nozzle is connected, the articulation preferably being configured in this way is that the dead corner area is less than about 2.5% of the turbulence outlet cross-section, and wherein a respective increment of the Inner surface of a respective turbulence generator channel measured in the z direction is preferably less than about 8 mm.
  • a respective step jump is smaller than about 5 mm, which also makes hydraulically relevant disadvantages practical excluded are.
  • Another object of the invention is therefore to provide an improved headbox to create the kind mentioned, in particular a softer formation allows.
  • this object is achieved by that the nozzle has such a shape that the main acceleration at least part of the flow only in the region of the flow direction considered rear nozzle end takes place.
  • the nozzle preferably has such a shape that the main acceleration at least part of the flow in one immediately before the rear
  • the nozzle end area takes place, which is about 1% to about 15% of the Corresponds to the nozzle length.
  • the nozzle When viewed in the z direction, the nozzle can have a corresponding one on one side or one side Show final convergence.
  • the sum is advantageously in the sum in a range from about 8 mm to about 50 mm and preferably in a range from about 15 mm to about 30 mm.
  • this is also advantageous again in a range from about 8 mm to about 50 mm and preferably in a range from about 15 mm to about 30 mm.
  • the jet becomes smoother on the surface, resulting in fewer air pockets and thus leads to less formation disorders. In addition, arise improved beam injection conditions.
  • the nozzle space protruding molded part which advantageously consists of a variety there are divisions, each division being individually adjustable.
  • the length of the molded part protruding into the nozzle space lies in a known manner a range from about 8 mm to about 50 mm.
  • slat lengths again or slats of different lengths are preferably slat lengths again or slats of different lengths provided.
  • Figure 1 shows a schematic, partially sectioned partial representation of an example Embodiment of a headbox 10 according to the first aspect of FIG Invention.
  • the headbox 10 comprises a turbulence generator in the direction of the headbox SL (arrow) or generator 12 adjoining nozzle 14, the interior 16 is at least partially divided by lamellae 18, 20, each for example are articulated to the turbulence generator 12 and starting viewed from the inlet side in the direction of flow SL (arrow) Extend the nozzle end into the nozzle space 16.
  • the longer slats end in a range of around 90% to about 120% and preferably in a range from about 90% to about 99% of the starting from the nozzle length I measured at the inlet end of the nozzle.
  • the shorter fins 20 end in a range from about 40% to about 90% and preferably in a range from about 55% to about 90% of the starting nozzle length I measured from the inlet end of the nozzle.
  • the rear ends of the longer fins are viewed in the direction of flow SL (arrow) 18 are preferably each with a structured surface and / or with with a very sharp tip.
  • the slats 18, 20 can each have, for example, a hinge-like slat holder 22 hingedly connected to the turbulence generator or generator 12 his.
  • the nozzle 14 can, for example, use a turbulence be upstream, which has a plurality of channels 24, the boundary surfaces have a turbulence-generating surface structure.
  • a respective channel 24 in a cross section perpendicular to the flow direction SL (arrow) in particular is considered to be at least twice as long as it is wide.
  • the slats 18, 20 can have a thickness in a range of approximately, for example Have 2 to about 6 mm. Viewed in the area of their flow direction SL (arrow) the rear end of the slats 18 in particular with a variety be provided with slots or the like.
  • Figure 2 shows a schematic, partially sectioned partial representation of an example Embodiment of a headbox 10 according to the second aspect of FIG Invention.
  • the headbox 10 again comprises a turbulence generator 12 downstream nozzle 14, the interior 16 at least in some areas is divided by lamellae 18, 20, which proceed from in the direction of flow SL (arrow) looks at the inlet end of the nozzle Extend nozzle space 16.
  • the slats 18, 20 can for example be articulated to the turbulence generator 12 again.
  • the headbox 10 is designed as a multi-layer headbox, by the nozzle space 16 by, for example, two separating fins 18 in, for example three sub-nozzle spaces 16 ', 16 ", 16"' is divided.
  • the longer separating fins 18 end in a range from about 90% to about 120% and preferably in a range from about 95% to about 105% of the Nozzle length I.
  • the shorter slats 20 again end in a range from approximately 40% to approximately 90% and preferably in a range from about 55% to about 90% of the Nozzle length I.
  • Separating lamellae 18 can in particular again have a structured surface and / or be provided with a very sharp tip.
  • the longer separating fins 18 preferably have a higher rigidity or strength than the shorter slats 20.
  • Figure 3 shows an embodiment of the headbox 10 according to the second aspect of the invention, in which only a longer one Separating lamella 18 is provided and the nozzle chamber 16 accordingly only in two partial nozzle spaces 16 ', 16 "is divided. As can be seen from FIG is, only two shorter slats 20 are provided here.
  • this headbox can, for example, at least essentially be designed again like the headbox according to FIG. 2.
  • Figure 4 shows a schematic, partially sectioned partial representation of an example Embodiment of a headbox 10 according to the third aspect of FIG Invention.
  • the headbox 10 can again be a turbulence generator 12 subsequent nozzle 14, the interior 16 at least is divided in regions by at least one lamella 18, 20 which starting from the inlet side viewed in the direction of flow SL (arrow) Extends nozzle end into the nozzle space 16.
  • At least one slat 18, 20 is preferably a hinge-like one Lamella holder 22 articulated with the turbulence generator upstream of the nozzle 14 or generator 12 connected.
  • the articulation is preferred designed in such a way that the dead corner area is less than about 2.5% of the turbulence generator outlet cross-section.
  • a respective step jump of the inner surface of a respective turbulence generator channel 24 measured in the z direction in particular less than about 8 mm and preferably less than about 5 mm.
  • stepped slat lengths or slats can be used again 18, 20 of different lengths can be provided.
  • FIG. 5 shows an example in a schematic, partially sectioned partial illustration Embodiment of a headbox 10 according to the fourth aspect of FIG Invention.
  • the headbox 10 again comprises a turbulence generator 12 downstream nozzle 14, the interior 16 at least in some areas is divided by fins 18, 20 which are connected to the turbulence generator 12 are connected and viewed from the direction of flow SL (arrow) extend on the inlet-side nozzle end into the nozzle space 16.
  • the nozzle 14 has such a shape that the main acceleration at least part of the flow only in the region of the flow direction SL (arrow) rear nozzle end takes place.
  • the nozzle can 14 in particular have such a shape that the main acceleration at least part of the flow in one immediately before the rear The nozzle end area takes place, which is about 1% to about 15% of the Corresponds to nozzle length I.
  • the nozzle 14 is viewed in the z direction a corresponding final convergence S1 or S2 on both sides.
  • the Final convergence S (arrow) S1 + S2 in total preferably in one area from about 8 mm to about 50 mm and preferably in a range from about 15 mm to about 30 mm.
  • stepped slat lengths or slats 18, 20 of different lengths are provided.
  • Figure 6 shows a schematic partially sectioned partial representation of another Embodiment of a headbox 10 according to the fourth aspect of the invention.
  • the nozzle 14 has a corresponding one-sided view in the z direction
  • This final convergence S (arrow) lies expediently again in a range from about 8 mm to about 50 mm and preferably in a range from about 15 mm to about 30 mm.
  • Mutually to End convergence S (arrow) is a molded part 26 projecting into the nozzle space 16 arranged.
  • This schematically illustrated molded part 26 preferably consists of a large number of divisions, each division being individually adjustable, that is, its length protruding into the nozzle space 16 can be changed.
  • the length of the molded part 26 projecting into the nozzle space 16 also lies in a range from about 8 mm to about 50 mm.
  • Such a molded part 26 together Adjustment mechanism is for example in the German patent DE 42 41 076 C2 disclosed; the content of this publication is hereby the subject of made the present description.
  • the invention improves the Headbox of the type mentioned is created with which one in view high free product quality is generated.

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  • Nozzles (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Paper (AREA)
EP04100605A 2003-02-27 2004-02-13 Caisse de tête Ceased EP1452640A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10308555 2003-02-27
DE2003108555 DE10308555A1 (de) 2003-02-27 2003-02-27 Stoffauflauf

Publications (2)

Publication Number Publication Date
EP1452640A2 true EP1452640A2 (fr) 2004-09-01
EP1452640A3 EP1452640A3 (fr) 2004-11-17

Family

ID=32748087

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04100605A Ceased EP1452640A3 (fr) 2003-02-27 2004-02-13 Caisse de tête

Country Status (2)

Country Link
EP (1) EP1452640A3 (fr)
DE (1) DE10308555A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1881106A1 (fr) 2006-07-21 2008-01-23 Voith Patent GmbH Caisse de tête d'une machine destinée à la fabrication d'une bande de matière fibreuse
DE102007036945A1 (de) 2007-08-04 2009-02-05 Voith Patent Gmbh Verfahren zur Beeinflussung der Zweiseitigkeit der Layer Orientation und Stoffauflauf zur Durchführung des Verfahrens

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923593A (en) * 1971-12-03 1975-12-02 Beloit Corp Multiple ply web former with divided slice chamber
CA1230251A (fr) * 1983-11-25 1987-12-15 Jose J. A. Rodal Regulateur flottant de debit sur caisse de tete
FI934697A7 (fi) * 1992-11-05 1994-05-06 Voith Gmbh J M Paperikoneen perälaatikko, jonka alahuuli on muunneltavissa
DE4329810C2 (de) * 1993-09-03 1997-02-06 Voith Gmbh J M Geometrie des Lamellenendes eines Stoffauflaufes
DE4433445C1 (de) * 1994-09-20 1996-03-28 Voith Gmbh J M Stoffauflauf einer Papiermaschine
DE19715790A1 (de) * 1997-04-16 1998-10-22 Voith Sulzer Papiermasch Gmbh Vorrichtung zur Bildung einer Stoffsuspensionslage
DE29713272U1 (de) * 1997-07-25 1997-11-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Stoffauflauf zur Bildung einer Faserstoffsuspensionsschicht
SE511684C2 (sv) * 1998-03-02 1999-11-08 Valmet Karlstad Ab Flerskiktsinloppslåda
DE20015471U1 (de) * 2000-09-07 2000-11-16 Valmet Corp., Helsinki Im Lippenkanal eines Stoffauflaufs einer Papiermaschine anzubringende Turbulenzbarte
DE10211178A1 (de) * 2002-03-14 2003-09-25 Voith Paper Patent Gmbh Stoffauflauf einer Paper- oder Kartonmaschine
DE10245157A1 (de) * 2002-09-27 2004-04-08 Voith Paper Patent Gmbh Stoffauflauf

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1881106A1 (fr) 2006-07-21 2008-01-23 Voith Patent GmbH Caisse de tête d'une machine destinée à la fabrication d'une bande de matière fibreuse
DE102007036945A1 (de) 2007-08-04 2009-02-05 Voith Patent Gmbh Verfahren zur Beeinflussung der Zweiseitigkeit der Layer Orientation und Stoffauflauf zur Durchführung des Verfahrens
EP2025809A2 (fr) 2007-08-04 2009-02-18 Voith Patent GmbH Procédé pour influencer de la dualité de l'orientation de couche et caisse de tête destinée à l'exécution du procédé
EP2025809A3 (fr) * 2007-08-04 2012-10-31 Voith Patent GmbH Procédé pour influencer de la dualité de l'orientation de couche et caisse de tête destinée à l'exécution du procédé

Also Published As

Publication number Publication date
DE10308555A1 (de) 2004-10-21
EP1452640A3 (fr) 2004-11-17

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