EP2025809A2 - Procédé pour influencer de la dualité de l'orientation de couche et caisse de tête destinée à l'exécution du procédé - Google Patents

Procédé pour influencer de la dualité de l'orientation de couche et caisse de tête destinée à l'exécution du procédé Download PDF

Info

Publication number
EP2025809A2
EP2025809A2 EP08161250A EP08161250A EP2025809A2 EP 2025809 A2 EP2025809 A2 EP 2025809A2 EP 08161250 A EP08161250 A EP 08161250A EP 08161250 A EP08161250 A EP 08161250A EP 2025809 A2 EP2025809 A2 EP 2025809A2
Authority
EP
European Patent Office
Prior art keywords
pulp suspension
headbox
jet
nozzle
suspension jet
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.)
Withdrawn
Application number
EP08161250A
Other languages
German (de)
English (en)
Other versions
EP2025809A3 (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 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 Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2025809A2 publication Critical patent/EP2025809A2/fr
Publication of EP2025809A3 publication Critical patent/EP2025809A3/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • D21F1/028—Details of the nozzle 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/026—Details of the turbulence section

Definitions

  • the invention relates to a method for influencing the two-sidedness of the layer orientation in a pulp suspension jet guided in a headbox of a headbox of a machine for producing a fibrous web, in particular a paper or board web, as a pulp suspension stream and discharged from the headbox nozzle as a free jet.
  • the invention relates to a headbox for a machine for producing an at least single-layer fibrous web, in particular a paper or board web, having a nozzle upper wall and a lower nozzle wall and two side walls, tapering to a nozzle gap and a flowed through by at least one fibrous suspension nozzle chamber having headbox nozzle, which performs the at least one pulp suspension as a pulp suspension stream and discharges as a pulp suspension jet.
  • Such a headbox is for example from the European patent application EP 1 452 640 A2 known. Its asymmetrical headbox nozzle leads to a more or less pronounced two-sidedness of the so-called layer orientation between the top and bottom of the finished fibrous web.
  • a layer here is a height range formed from a pulp suspension partial stream in the height direction of the finished fibrous web. In the layer is formed by the given flow conditions and the generated shear forces or the generated velocity profile in the headbox, in particular in the headbox, a certain orientation of the fibers contained in the pulp suspension partial flow, the so-called fiber main orientation.
  • the orientation of the fibers in a layer is defined by the ratio of machine direction (MD) orientation and cross machine direction (CD) orientation.
  • the layer orientation can be determined either optically or by the ratio of the layer strength in the machine direction (MD) and the layer strength in the cross machine direction (CD).
  • the curl can be cited for copying papers which may no longer be usable, that is to say salable, due to too great a curl tendency.
  • the curl arises from the fact that the leaf halves, ie the layers, expand differently during recontamination and the associated change in moisture, since the shrinkage or elongation of the fibers in the fiber direction is about 10 times smaller in a moisture absorption than in their height direction.
  • the two-sidedness of the layer orientation between the top and the bottom of the pulp suspension jet and ultimately the finished fibrous web can be selectively influenced, the headbox, and even the machine can be adapted to the requirements of various woodfiber fibrous webs.
  • the pulp suspension stream is acted upon by at least one agent on its two surfaces immediately prior to its discharge from the headbox nozzle.
  • the pulp suspension jet is acted upon immediately after its application from the headbox on one of its two surfaces or on its two surfaces of at least one means.
  • the pulp suspension jet formed as a free jet is acted upon by at least one agent on one of its two surfaces or on its two surfaces.
  • All preferred embodiments have at least the advantageous property that the pulp suspension stream or pulp suspension jet is acted upon effectively and efficiently for the purpose of changing turbulence and fluid friction. This results in the aforementioned advantages of the method according to the invention.
  • the object of the invention is achieved in a headbox of the type mentioned in that means for influencing the two-sidedness of the layer orientation in the pulp suspension stream or pulp suspension jet are provided, the pulp suspension stream or pulp suspension jet at least on one of its two surfaces for the purpose of changing turbulence and fluid friction apply.
  • the means comprise at least two positionable elements, which are arranged on both sides acting on at least mutually in the inner side outlet region of the two nozzle walls and the pulp suspension stream. This can be taken very early influence on the turbulence in the pulp suspension stream or later pulp suspension jet. Any turbulence differences in the pulp suspension stream or subsequent pulp suspension jet due to increased fluid friction can be efficiently generated.
  • the positionable element has a substantially circular main body with a nose pointing in the direction of flow of the pulp suspension jet, with the respective nose forming an area which is preferably tangential to the inside nozzle wall.
  • the body thus formed allows a simple and precise positioning of the element, for example by a rotation about the longitudinal axis of the body.
  • the preferably tangentially extending region of the respective nose preferably has a length in the range from 0 to 200 mm, preferably from 2 to 30 mm.
  • the substantially circular basic body can ideally have a diameter in the range of 2 to 200 mm, preferably of 5 to 50 mm.
  • the preferably tangentially extending regions of the lugs of the two elements can preferably be aligned at an angle of -10 to 180 °, preferably from 0 to 90 °.
  • both the beam direction and the jet launch angle of the pulp suspension jet can be actively influenced or determined.
  • a nose has a lower lip board preferably in the range of 0 to 50 mm, preferably of 0 to 20 mm.
  • the means comprise at least one positionable element which is arranged in the outlet region of a nozzle wall and in which the fibrous suspension jet is formed in its initial region to act on at least one side.
  • the means may also comprise at least two positionable elements, which are formed on both sides acting on each other at least in the outlet region of the two nozzle walls and the pulp suspension jet in its initial region. This can be taken very early influence on the turbulence in the pulp suspension jet. Any turbulence differences in the pulp suspension jet due to increased fluid friction can be efficiently generated.
  • the positionable element comprises a film that can be adjusted in the flow direction of the pulp suspension jet and can be wound up and unwound on a base body to form an extendable flow wall that provides the technologically necessary effective length of the element.
  • the film may consist of a flexible material, in particular a metal, a plastic or the like.
  • the extendable flow walls of the two elements may be symmetrical or asymmetrical depending on the operating requirements.
  • an element may have a supernatant in the range of 0 to 400 mm, preferably from 0 to 50 mm.
  • the extendable flow wall of the element has a wall length in the range of 0 to 400 mm, preferably from 0 to 50 mm, so that there is always a technologically sufficient effective length.
  • the film In order for the film to provide technologically sufficient rigidity even at higher grammages, it preferably has a thickness in the range of 0.1 to 5.0 mm, preferably 0.1 to 1.0 mm.
  • the means comprise at least one positionable element, which is arranged in the region of the pulp suspension jet and at least one side acting on it.
  • the means may also comprise at least two positionable elements, which are arranged at least mutually in the area of the pulp suspension jet and acting on both sides.
  • the element comprises a brake shoe with at least one effective surface which acts on the pulp suspension jet and which produces the technologically necessary effective length of the element.
  • the brake shoe is preferably adjustable in the height direction and / or in the flow direction of the pulp suspension jet by means of at least one adjusting device, so that optimal conditions for the production of a high-quality fibrous web are always provided.
  • the active surface of the brake shoe is preferably in the range of 2 to 400 mm, preferably from 5 to 50 mm, so that all technological requirements are met.
  • the brake shoe preferably has a distance from the headbox nozzle in the range of 0 to 500 mm, preferably from 0 to 50 mm.
  • the selected distance is ultimately dependent on the former configuration adjoining the headbox, together with the associated former geometry.
  • the means are preferably provided with a multiplicity of individually positionable graduations.
  • FIGS. 1A to 1C, 2 and 3 show at least in each case a schematic and sectional side view of the downstream part of a headbox 2 of a headbox 1 for a machine for producing a merely schematically indicated fibrous web 3 from at least one pulp suspension 4.
  • the fibrous web 3 formed from the at least one pulp suspension 4 may be in particular a paper, board or tissue web.
  • the headbox 2 of the headbox 1 has an upper nozzle wall 5 and a lower nozzle wall 6 and two side walls, not shown, which form a nozzle chamber 7.
  • the nozzle chamber 7 through which the at least one pulp suspension 3 flows narrows in the flow direction S (arrow) to form a nozzle gap 8.
  • the headbox nozzle 2 carries the at least one pulp suspension 3 as a pulp suspension stream 9 (arrow) and discharges it as a pulp suspension jet 10 (arrow) via the nozzle gap 8.
  • means 12 for influencing the two-sidedness of the layer orientation in the pulp suspension stream 9 (arrow) or pulp suspension jet 10 (arrow) are provided which at least impart the pulp suspension stream 9 (arrow) or pulp suspension jet 10 (arrow) at one of its two surfaces 13.O, 13.U apply to change turbulence and fluid friction.
  • the surfaces 13.0, 13.U are merely exemplary of the respective pulp suspension jet 10 (arrow) indicated.
  • the means 12 may be provided with a plurality of individually positionable divisions.
  • the means 12 illustrated in exemplary operating settings comprise at least one positionable element 14.1, 14.2, which is arranged in the inside outlet region of a nozzle wall 5, 6 and the pulp suspension stream 9 (arrow) at least on one side.
  • the positionable elements 14.1, 14.2 are arranged correspondingly on both nozzle walls 5, 6.
  • the individual element 14.1, 14.2 has a substantially circular basic body 15.1, 15.2 with a nose 16.1, 16.2 pointing in the flow direction S (arrow) of the pulp suspension jet 10 (arrow), the respective nose 16.1, 16.2 preferably being tangential to the corresponding inside nozzle wall extending portion 17.1, 17.2 forms.
  • the respective substantially circular basic body 15.1, 15.2 has a diameter D.1, D.2 in the range of 2 to 200 mm, preferably of 5 to 50 mm, and the preferably tangentially extending portion 17.1, 17.2 of the nose 16.1, 16.2 points a length L.1, L.2 in the range of 0 to 200 mm, preferably from 2 to 30 mm, on.
  • the positioning of the respective element 14.1, 14.2 is effected by a rotation about the longitudinal axis A.1, A.2 of the associated main body 15.1, 15.2.
  • Figure 1A In the execution of Figure 1A are the preferably tangentially extending portions 17.1, 17.2 of the lugs 16.1, 16.2 of the two elements 14.1, 14.2, symmetrical whereas they are in the execution of the Figure 1C also aligned in parallel. However, they can only be aligned parallel to one another.
  • FIG. 1A And in the execution of Figure 1A are the preferably tangentially extending portions 17.1, 17.2 of the lugs 16.1, 16.2 of the two elements 14.1, 14.2 aligned asymmetrically and the nose 16.1 of the upper element 14.1 has a lower lip board V in the range of 0 to 50 mm, preferably from 0 to 20 mm opposite the nose 16.2 of the lower element 14.2.
  • the means 12 illustrated in an exemplary operating setting comprise at least one positionable element 18.1, 18.2, which is arranged in the outlet region of a nozzle wall 5, 6 and forms the pulp suspension jet 10 (arrow) in its initial region at least on one side.
  • the positionable elements 18.1, 18.2 on both nozzle walls 5, 6 are arranged accordingly.
  • the individual element 18.1, 18.2 comprises a foil 19.1, 19.2, which can be wound up and unwound on a base body 20.1, 20.2 in the flow direction S (arrow) of the pulp suspension jet 10 (arrow) and for the purpose of forming an extendable flow wall 21.1, 21.2.
  • the extendable flow walls 21.1, 21.2 of the two elements 18.1, 18.2 can be aligned symmetrically or asymmetrically.
  • the extendable flow wall 21.1 of the upper element 18.1 has a projection Ü in the range of 0 to 400 mm, preferably 0 to 50 mm, compared to the extendable flow wall 21.2 of the lower element 18.2.
  • the extendable flow wall 21.1, 21.2 of the individual element 18.1, 18.2 has a wall length W.1, W.2 in the range from 0 to 400 mm, preferably from 0 to 50 mm.
  • the respective film 19.1, 19.2 has a thickness T.1, T.2 in the range from 0.1 to 5.0 mm, preferably from 0.1 to 1.0 mm.
  • the individual film 19.1, 19.2 is preferably made of a flexible material, in particular a metal, a plastic or the like.
  • the means 12 illustrated in an exemplary operating setting comprise at least one positionable element 22 which is arranged in the area of the pulp suspension jet 10 (arrow) and acts on it at least on one side.
  • only one positionable element 22 is provided;
  • the one-sided loading of the pulp suspension jet 10 (arrow) on its upper surface 13.0 by the positionable element 22 causes its at least one-sided deflection, which is shown in dashed form.
  • the at least one-sided deflection will generally lead to a deflection of the entire pulp suspension jet 10 (arrow).
  • the positionable element 22 comprises a brake shoe 23 with at least one active surface 24 acting on the pulp suspension jet 10 (arrow).
  • the brake shoe 23 is in the height direction (H) and / or in the flow direction (S) of the pulp suspension jet 10 (arrow) by means of at least one known to the person skilled in the art Adjustable adjusting device, wherein the adjustability or positioning is indicated by means of double arrows by way of example.
  • the one in the five FIGS. 1A to 1C, 2 and 3 described headbox 1 is suitable in a particular extent for carrying out the method according to the invention for influencing the two-sidedness of the layer orientation in a in a headbox of a headbox of a machine for producing an at least single-layer fibrous web, in particular a paper or board web, as a pulp suspension flow and guided by the Headbox nozzle discharged as a free jet pulp suspension jet.
  • pulp suspension flow 9 or pulp suspension jet 10 (arrow) at least on one of its two surfaces 13.O, 13.U of at least one means 12 (14.1, 14.2; 18.1, 18.2; Turbulence and fluid friction is applied.
  • FIGS. 1A to 1C, 2 and 3 Headbox described in a special degree for carrying out the dependent method claims.
  • the invention provides a method and a headbox with which the two-sidedness of the layer orientation between the top and the bottom of the pulp suspension jet and ultimately the finished fibrous web can be influenced in a targeted manner.

Landscapes

  • Paper (AREA)
EP08161250A 2007-08-04 2008-07-28 Procédé pour influencer de la dualité de l'orientation de couche et caisse de tête destinée à l'exécution du procédé Withdrawn EP2025809A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710036945 DE102007036945A1 (de) 2007-08-04 2007-08-04 Verfahren zur Beeinflussung der Zweiseitigkeit der Layer Orientation und Stoffauflauf zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
EP2025809A2 true EP2025809A2 (fr) 2009-02-18
EP2025809A3 EP2025809A3 (fr) 2012-10-31

Family

ID=39876829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08161250A Withdrawn EP2025809A3 (fr) 2007-08-04 2008-07-28 Procédé pour influencer de la dualité de l'orientation de couche et caisse de tête destinée à l'exécution du procédé

Country Status (2)

Country Link
EP (1) EP2025809A3 (fr)
DE (1) DE102007036945A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010149413A3 (fr) * 2009-06-22 2011-02-24 Voith Patent Gmbh Caisse de tête pour une machine servant à fabriquer une bande de matériau fibreux

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1452640A2 (fr) 2003-02-27 2004-09-01 Voith Paper Patent GmbH Caisse de tête

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI905896A7 (fi) * 1990-11-29 1992-05-30 Valmet Paper Machinery Inc Formningsgapsarrangemang i en dubbelviraformare av en pappersmaskin.
US6146501A (en) * 1997-12-15 2000-11-14 Kimberly Clark Worldwide Cross-machine direction stiffened dividers for a papermaking headbox
US6117271A (en) * 1998-04-15 2000-09-12 Beloit Technologies, Inc. Slice lip apparatus
WO2000019008A1 (fr) * 1998-09-30 2000-04-06 Kimberly-Clark Worldwide, Inc. Pont destine a un equipement de formage du papier et methode appropriee
DE102006033847A1 (de) * 2006-07-21 2008-01-24 Voith Patent Gmbh Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn
DE102006049025A1 (de) * 2006-10-13 2008-04-17 Voith Patent Gmbh Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1452640A2 (fr) 2003-02-27 2004-09-01 Voith Paper Patent GmbH Caisse de tête

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010149413A3 (fr) * 2009-06-22 2011-02-24 Voith Patent Gmbh Caisse de tête pour une machine servant à fabriquer une bande de matériau fibreux
CN102428228A (zh) * 2009-06-22 2012-04-25 福伊特专利公司 用于制造纤维材料幅的机器所用的流浆箱

Also Published As

Publication number Publication date
EP2025809A3 (fr) 2012-10-31
DE102007036945A1 (de) 2009-02-05

Similar Documents

Publication Publication Date Title
EP0711869B1 (fr) Caisse de tête à plusieurs couches
EP2379801B1 (fr) Système de mise en bande destiné à une machine de production d'une bande de matière fibreuse multicouche
DE69707256T2 (de) DOPPELSIEBFORMER MIT ROLLE UND KLINGE FüR EINE PAPIERMASCHINE
EP0581051B1 (fr) Caisse de tête à plusieurs couches pour une machine à papier ou analogue
EP2739780B1 (fr) Système de formation de feuille pour une machine de fabrication d'une bande de matière fibreuse à deux couches ou plus
WO2010046312A2 (fr) Caisse de tête bicouches pour une machine de fabrication d'une bande bicouches de matière fibreuse
DE2716598A1 (de) Doppelsiebteil einer papiermaschine
EP2446083B1 (fr) Tête de caisse pour une machine servant à fabriquer une bande de matériau fibreux
EP1881106B1 (fr) Caisse de tête d'une machine destinée à la fabrication d'une bande de matière fibreuse
EP2025809A2 (fr) Procédé pour influencer de la dualité de l'orientation de couche et caisse de tête destinée à l'exécution du procédé
DE69810980T2 (de) Doppelsiebformer in einer Papiermaschine mit einer Entwässerungsvorrichtung
EP0899376B1 (fr) Section de formage avec chariot de format
EP4328376B1 (fr) Formeur à tamis oblique
EP2085511B1 (fr) Caisse de tête multicouche pour une machine destinée à la fabrication d'une bande de matière fibreuse multicouche
EP1659211B1 (fr) Système de formation d'une machine pour fabriquer une bande fibreuse
DE102010041332A1 (de) Blattbildungssystem
EP2205792B1 (fr) Formeur à double toile
EP2072677B1 (fr) Partie humide à deux toiles pour une machine destinée à la fabrication d'une bande de matière fibreuse à partir d'au moins une suspension de matière fibreuse
EP1953296A1 (fr) Procédé de fabrication d'une bande de matière fibreuse et section de formage à deux toiles pour la mise en oeuvre du procédé
DE102005010628A1 (de) Stoffauflauf
DE10245156A1 (de) Stoffauflauf
DE102007035488A1 (de) Verfahren zur Herstellung einer Faserstoffbahn und Doppelsiebformer zur Durchführung des Verfahrens
DE10318035A1 (de) Stoffauflauf
DE10256510A1 (de) Stoffauflauf einer Papier- oder Kartonmaschine zur Herstellung einer Faserstoffbahn
DE202004001935U1 (de) Blattbildungssystem

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

RIC1 Information provided on ipc code assigned before grant

Ipc: D21F 1/02 20060101AFI20120921BHEP

AKY No designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: R108

REG Reference to a national code

Ref country code: DE

Ref legal event code: R108

Effective date: 20130703

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20130503