EP1818447A1 - Procédé et dispositif pour la production d'une bande fibreuse - Google Patents

Procédé et dispositif pour la production d'une bande fibreuse Download PDF

Info

Publication number
EP1818447A1
EP1818447A1 EP06124878A EP06124878A EP1818447A1 EP 1818447 A1 EP1818447 A1 EP 1818447A1 EP 06124878 A EP06124878 A EP 06124878A EP 06124878 A EP06124878 A EP 06124878A EP 1818447 A1 EP1818447 A1 EP 1818447A1
Authority
EP
European Patent Office
Prior art keywords
displacement
fibrous web
machine according
dewatering
web
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Withdrawn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
EP06124878A
Other languages
German (de)
English (en)
Inventor
Joachim Henssler
Jürgen Prössl
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 EP1818447A1 publication Critical patent/EP1818447A1/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Withdrawn legal-status Critical Current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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0272—Wet presses in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper

Definitions

  • the invention relates to a method for producing a particularly multi-layered and / or multilayer fibrous web with a Gutseite and back, in which the fibrous web is at least partially dewatered by a displacement drainage by means of displacement gas. It further relates to a machine for producing such a fibrous web.
  • the fibrous web may in particular be a paper or board web.
  • Displacement Dewatering Process water is removed from the fibrous web by the application of a gas differential pressure.
  • the water in the pores between the fibers is blown out of the paper web.
  • the displacement dewatered paper has a higher specific volume.
  • Characteristic is the low density of the dewatered paper or cardboard.
  • migration of the fines may also improve the fission resistance of the fibrous web can be achieved. However, this effect only occurs if the drainage direction remains the same in the mobile phase.
  • the invention has for its object to provide an improved method and an improved machine of the type mentioned, in which the aforementioned problems are eliminated.
  • This object is achieved by a method for producing a particular multilayer and / or multilayer fibrous web having a Gutseite and a back, in which the fibrous web is at least partially dewatered by a Verdrijnungsentskysstation means of displacement gas, wherein the flow direction of the displacement gas at least in a region in the materials contained in the fibrous web such as in particular fillers, fines, contaminants, dyes and / or the like still have a predeterminable mobility is chosen so that the displacement gas flows from the Gutseite in the direction of the back of the fibrous web.
  • Soiling of the good side or ceiling is thus avoided by directed passage of the web from the good side to the back.
  • Displacement drainage takes place at a very early stage of the paperboard or paperboard production process, in which the small and minute particles contained in the fibrous web, in particular fillers, fines, contaminants, fibrous materials and / or the like, still have a high degree of mobility.
  • the water to be removed runs in this phase of high mobility preferably from the ceiling towards the back of the fibrous web. Fillers, fines, etc. are held in the ceiling. A washing out of these substances from the ceiling is thus avoided.
  • the mobility of said particles decreases with decreasing web moisture, i. increasing dry content of the fibrous web.
  • the predeterminable mobility range lies between the waterline and the boundary at which the average particle diameter of the substances contained in the fibrous web such as in particular fillers, fines, contaminants, dyes and / or the like greater than the average capillary diameter of the fibrous web becomes.
  • the predeterminable mobility range is determined by the fact that the fibrous web in this area has an average dry content, which is considered between the various layers or layers, which is between a lower value of about 5 to about 8% and an upper value of about 40 to about 50%. lies.
  • the predeterminable mobility range downwards is advantageously limited by a mean dry content of the fibrous web which is predeterminable over the various layers when the layers are covered.
  • the predetermined mean dry content of the fibrous web when Vergautschen the layers is expediently about 8 to about 12%.
  • the predeterminable range of mobility downwards is preferably limited by the waterline.
  • the lower limit of the predefinable mobility range is expediently at a dry content of about 5 to about 8%. It is about especially again around the mean dry content over the different layers or layers.
  • the fibrous web is acted upon by a permeable strip having a flow resistance in a respective displacement dewatering zone, so that a total pressure is applied to the fibrous web, resulting from a structure pressure caused by the pressure drop across the permeable band and the hydraulic pressure.
  • a displacement dewatering press is thus formed in a respective displacement dewatering zone, which means that the pressure acting on the fibrous web during the displacement dewatering on the side on which the gaseous fluid is supplied at least partially also acts as a structure pressure.
  • This structural pressure acting on the supply side results from the pressure drop across the permeable band on the side in question having a flow resistance. Accordingly, the total applied pressure is composed of the hydraulic and structural pressure.
  • Structural pressure can thus be understood to mean the pressure transferred by solids, whereby this pressure component is characterized in that it acts in a directed manner. In contrast, the hydraulic pressure acts in all directions.
  • a membrane is used as the permeable band provided with a flow resistance.
  • a sieve or the like is conceivable.
  • a respective displacement drainage zone can therefore act, for example, by the use of a permeable belt having a corresponding flow resistance, such as, in particular, a membrane, a sieve or the like, as a displacement dewatering press unit, in which the web is also subjected to a structural pressure.
  • a permeable belt having a corresponding flow resistance such as, in particular, a membrane, a sieve or the like
  • the permeable band which has a flow resistance and is formed, for example, by a membrane, a sieve or the like, moreover homogenises the flow through the web.
  • the total pressure applied to the fibrous web in the web running direction is gradually increased in accordance with a preferred practical embodiment of the method according to the invention.
  • two or more displacement dewatering zones or press units can be passed through.
  • the hydraulic pressure applied to the fibrous web can also be increased stepwise.
  • the reference surface here is the top surface of the fibrous web.
  • the flow velocity can be limited.
  • two or more displacement dewatering press units can be passed through.
  • the applied hydraulic differential pressure between the crop or cover side and the back of the fibrous web can be gradually increased, whereby, for example, again the flow velocity can be limited.
  • the hydraulic differential pressure can advantageously be increased stepwise, at least in that permeable bands of different permeability are used in the various displacement dewatering zones or pressing units on the good side of the fibrous web.
  • the applied hydraulic differential pressure between the Gutseite and the back so for example by a targeted choice of permeability the permeable band, ie for example a membrane, a sieve or the like on the ceiling side are influenced accordingly.
  • the hydraulic differential pressure can advantageously be increased stepwise at least by providing different additional flow resistances in the various displacement dewatering zones or pressing units on the rear side of the fibrous web.
  • At least one membrane preferably at least one anti-rewet membrane is used in at least one displacement dewatering zone on the back of the fibrous web.
  • the hydraulic differential pressure can therefore also be increased stepwise, at least by using a different number of membranes in the different displacement dewatering zones or pressing units on the rear side of the fibrous web.
  • the provided for influencing the hydraulic differential pressure additional flow resistance on the back can therefore be generated for example by a further membrane or a specifically set, in particular low permeability of an anti-rewet membrane.
  • this tensioning band can be, for example, a dewatering screen.
  • a dewatering felt may also be provided.
  • the total pressure applied to the fibrous web is preferably selected to be higher than the ambient pressure. As already mentioned, this total pressure is the sum of the hydraulic pressure and the structure pressure.
  • the first displacement dewatering zone viewed in the web running direction, is provided in the wire section of the relevant paper machine.
  • this first displacement dewatering zone may, for example, also be provided at the beginning of the press section of the relevant paper machine.
  • this press section can also comprise at least one shoe press.
  • this first displacement dewatering zone is provided within the press section.
  • this press section may again contain at least one shoe press.
  • the last displacement dewatering zone considered in the web running direction is provided after the press section of the relevant paper machine, which may be a conventional press section.
  • this press section may again comprise at least one shoe press.
  • the last displacement dewatering zone is provided immediately before the dryer section of the respective paper machine.
  • the temperature of the displacement gas is chosen to be> 40 ° C. for at least one displacement dewatering zone or pressing unit.
  • this temperature of the displacement gas is preferably ⁇ 250 ° C.
  • the temperature of the displacement gas is preferably chosen below the boiling temperature of water corresponding to the feed pressure.
  • the temperature of the fibrous web when leaving the displacement dewatering zone or partial zone can be selected to be at most the boiling point of water corresponding to the ambient pressure.
  • the good side of the fibrous web can be produced, for example, by a cover layer lying on top. In principle, however, it is also possible to produce the good side of the fibrous web by a cover layer lying on the underside.
  • a cover layer forming the good side of the fibrous web is produced on an upper wire of the relevant paper machine.
  • the flow direction of the displacement gas in all displacement drainage zones is selected such that the displacement gas flows from the good side toward the rear side of the fibrous web.
  • the flow direction of the displacement gas in the different displacement drainage zones but in a respective displacement dewatering zone in the mobility range of substances contained in the fibrous web such as in particular fillers, fines, contaminants, dyes and / or the like, the flow direction of the good side is selected to the back.
  • the displacement gas may be, for example, air, superheated steam, etc.
  • a further porous covering in particular a sieve, can also be provided between the permeable band or membrane or sieve having a flow resistance and the fibrous web.
  • the fibrous web can also be passed between two sieve belts through a respective displacement drainage zone, preferably provided with a membrane or the like.
  • the inventive machine for producing a particular multilayer and / or multilayer fibrous web having a Gutseite and a back comprises at least one Verdrijnungsenticass mecanicszone in which the fibrous web is dewatered by a displacement drainage by means of displacement gas, wherein the flow direction of the displacement gas at least in a region in which in the Fiber material web containing substances such as in particular fillers, fines, contaminants, dyes and / or the like still have a predeterminable mobility is chosen so that the displacement gas flows from the Gutseite towards the back of the fibrous web.
  • at least one blowing device, in particular a blow box, for dispensing the displacement gas and at least one suction device, in particular a suction box can be arranged to receive the displacement gas.
  • At least one displacement dewatering zone comprises a displacement dewatering cluster press in which a pressure chamber is formed by a multi-roll arrangement, through which the fibrous web is passed.
  • FIG. 1 shows, in a schematic partial representation, an exemplary embodiment of a machine 10 according to the invention for producing a two-layer fibrous web with a good side and a back side.
  • the fibrous web may in particular be a paper or board web.
  • the machine 10 is illustratively designed as a gap former. Of course, it may also be embodied as a hybrid former or as a wire former.
  • the good side of the fibrous web is produced by a top layer lying on the top.
  • the machine 10 comprises a displacement dewatering zone 12 in which the fibrous web is displaced by displacement gas is drained.
  • the flow direction S of the displacement gas is selected such that the displacement gas flows from the good side in the direction of the rear side of the fibrous web.
  • at least one blowing device, in particular a blow box, for dispensing the displacement gas and at least one suction device, in particular a suction box may be arranged to receive the displacement gas.
  • the displacement dewatering zone 12 is provided in a region in which substances contained in the fibrous web, in particular fillers, fines, contaminants, dyes and / or the like, still have a high mobility.
  • the displacement dewatering zone 12 is provided in the screening zone.
  • the fibrous web is passed between two sieve belts 14, 16 lying through the displacement dewatering zone 12.
  • the two screen belts 14, 16 are previously brought together in the region of a roller 18 to form an entry gap 20 into which by means of a two-layer headbox 22, the pulp suspension required for the production of the fibrous web is introduced.
  • the fibrous web is acted upon by a flow resistance permeable tape, which is formed here for example by a membrane 24, with the displacement gas. However, between the membrane 24 and the fibrous web is still the upper wire 14th
  • a total pressure is thus applied to the fibrous web, which is composed of a structure pressure caused by the pressure drop across the membrane 24 and the hydraulic pressure.
  • FIG. 2 shows a schematic partial representation of another exemplary embodiment of the machine 10.
  • the good side of Fiber web produced by a cover layer lying on the underside.
  • the machine 10 is shown again as a gap former.
  • it may also be embodied as a hybrid former or as a wire former.
  • a provided in the wire section displacement drainage zone 12 is provided again.
  • the flow direction S of the displacement gas is chosen so that this displacement gas flows through the membrane 24, first the lower wire 16, then the fibrous web and then the upper wire 14. This ensures again that the displacement gas flows from the good side in the direction of the back of the fibrous web.
  • at least one blowing device, in particular a blow box, for dispensing the displacement gas and at least one suction device, in particular a suction box, for receiving the displacement gas can be arranged in the displacement dewatering zone 12.
  • the displacement dewatering zone 12 is again arranged in the present case in a region in which the substances contained in the fibrous web such as in particular fillers, fines, contaminants, dyes and / or the like still have a high mobility.
  • the total pressure applied to the fibrous web is composed of a structural pressure caused by the pressure drop across the membrane 24 and the hydraulic pressure.
  • the fibrous web is guided again between the two sieve belts 14, 16 through the displacement dewatering zone 12.
  • the two screen belts 14, 16 are again brought together in the region of a roller 18 to form an entry gap 20, which is charged with the pulp suspension supplied by the two-layer headbox 22.
  • the fibrous web is guided at least substantially rectilinearly through the displacement dewatering zone 12 together with the two sieve belts 14, the fibrous web lying between the two sieve belts 14, 16 is in the present embodiment shown in FIG the membrane 24 is guided around a roller 26, which may in particular be a suction roller.
  • the lower wire 16 is separated from the upper wire 14 together with the fibrous web 30 in the region of a separating element 28.
  • FIG. 3 shows, in a diagrammatic partial representation, a further embodiment of the machine 10.
  • the machine 10 is designed as a hybrid former with an attached longitudinal wire former.
  • this machine comprises an upper screen 32 for producing a cover layer forming the good side of the fibrous web 30.
  • This cover layer is applied by the upper screen 32 in the region of a roller 34 to a further layer formed on a lower screen 36.
  • the two screens 32, 36 each have a headbox 38 and 40, respectively.
  • a displacement dewatering zone 12 which again comprises a membrane 24 in the present case.
  • at least one blowing device, in particular a blow box, for dispensing the displacement gas and at least one suction device, in particular a suction box, for receiving the displacement gas can be arranged in the displacement dewatering zone 12.
  • the flow direction S of the displacement gas is chosen so that this first the membrane 24, then the fibrous web and then the lower sieve 36 flows through. It is thus ensured again in the present case that in the displacement dewatering zone 12, which is again here in the mobility of the particles contained in the fibrous web, the flow direction S of the displacement gas is selected so that the displacement gas from the Gutseite toward the back of the Fibrous web flows.

Landscapes

  • Paper (AREA)
EP06124878A 2006-02-08 2006-11-28 Procédé et dispositif pour la production d'une bande fibreuse Withdrawn EP1818447A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610000053 DE102006000053A1 (de) 2006-02-08 2006-02-08 Verfahren und Maschine zur Herstellung einer Faserstoffbahn

Publications (1)

Publication Number Publication Date
EP1818447A1 true EP1818447A1 (fr) 2007-08-15

Family

ID=38015546

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06124878A Withdrawn EP1818447A1 (fr) 2006-02-08 2006-11-28 Procédé et dispositif pour la production d'une bande fibreuse

Country Status (2)

Country Link
EP (1) EP1818447A1 (fr)
DE (1) DE102006000053A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999023302A1 (fr) 1997-10-31 1999-05-14 Kimberly-Clark Worldwide, Inc. Procede de fabrication de papier tissu basse densite avec entree d'energie reduite
DE19946982A1 (de) 1999-09-30 2001-04-05 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn
US6416631B1 (en) 1998-10-29 2002-07-09 Voith Sulzer Papiertechnik Patent Gmbh Pressing apparatus having semipermeable membrane
US6497789B1 (en) 2000-06-30 2002-12-24 Kimberly-Clark Worldwide, Inc. Method for making tissue sheets on a modified conventional wet-pressed machine
US20030056925A1 (en) 2001-09-27 2003-03-27 Beck David A. Anti-rewet felt for use in a papermaking machine
EP1362948A1 (fr) 1999-09-30 2003-11-19 Voith Paper Patent GmbH Procédé pour la déshydratation d' une bande fibreuse
US20040149405A1 (en) 2003-01-31 2004-08-05 David Beck Paper machine and method of dewatering a fiber web using displacement pressing and through air drying

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6096169A (en) 1996-05-14 2000-08-01 Kimberly-Clark Worldwide, Inc. Method for making cellulosic web with reduced energy input
WO1999023302A1 (fr) 1997-10-31 1999-05-14 Kimberly-Clark Worldwide, Inc. Procede de fabrication de papier tissu basse densite avec entree d'energie reduite
US6416631B1 (en) 1998-10-29 2002-07-09 Voith Sulzer Papiertechnik Patent Gmbh Pressing apparatus having semipermeable membrane
DE19946982A1 (de) 1999-09-30 2001-04-05 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn
EP1362948A1 (fr) 1999-09-30 2003-11-19 Voith Paper Patent GmbH Procédé pour la déshydratation d' une bande fibreuse
US6497789B1 (en) 2000-06-30 2002-12-24 Kimberly-Clark Worldwide, Inc. Method for making tissue sheets on a modified conventional wet-pressed machine
US20030056925A1 (en) 2001-09-27 2003-03-27 Beck David A. Anti-rewet felt for use in a papermaking machine
US20040149405A1 (en) 2003-01-31 2004-08-05 David Beck Paper machine and method of dewatering a fiber web using displacement pressing and through air drying

Also Published As

Publication number Publication date
DE102006000053A1 (de) 2007-08-09

Similar Documents

Publication Publication Date Title
EP1936031B1 (fr) Machine destinée à la fabrication d'une bande de matière fibreuse
EP1749934B1 (fr) Machine pour la fabrication du papier tissu
DE102008054990A1 (de) Vorrichtung und Verfahren zur Herstellung einer Materialbahn
EP3224409B1 (fr) Procédé et dispositif de fabrication de papier d'emballage
EP1637651A1 (fr) Machine pour fabriquer une bande de matière fibreuse
EP2640890B1 (fr) Dispositif et procédé de fabrication d'une bande de matériau
EP1770205A2 (fr) Bande pour transferer une bande fibreuse durant la fabrication de celle-ci
DE102010031440A1 (de) Verfahren und Maschine zur Herstellung einer Faserstoffbahn
EP0664356B1 (fr) Procédé et dispositif pour améliorer la qualité des papiers à plusieurs couches
EP3622112A1 (fr) Dispositif et procédé de fabrication d'une bande de matière fibreuse
DE102011077523A1 (de) Maschine zur Herstellung einer einseitig-glatten Faserstoffbahn
DE102021109340B4 (de) Maschine und Verfahren zur Herstellung einer Faserstoffbahn
DE19624127A1 (de) Verfahren und Stoffauflauf zur Herstellung einer mehrschichtigen Faserstoffbahn
EP0863254A2 (fr) Procédé et machine à papier pour la fabrication d'une bande fibreuse multi-couches
DE202017106978U1 (de) Siebpartie, insbesondere eine umgebaute Siebpartie
EP3152360B1 (fr) Moyen de production d'une bande de matière fibreuse
EP1780332A1 (fr) Dispositif et procédé pour le traitement d'une bande fibreuse, notamment d'une bande de carton ou de papier
DE102017110032A1 (de) Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn
EP1818447A1 (fr) Procédé et dispositif pour la production d'une bande fibreuse
DE102011083308A1 (de) Blattbildungsvorrichtung für eine Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffsuspension
DE60316971T2 (de) Verfahren zur herstellung von pappe und maschine zur herstellung von pappe
DE102007027310A1 (de) Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn, insbesondere Papier- oder Kartonbahn
DE102010029582A1 (de) Nasspartie einer Maschine zur Herstellung von Faserstoffbahnen und Verwendung einer derartigen Nasspartie
DE102005060715A1 (de) Papiermaschine mit einer oder mehreren Ventilvorrichtungen
DE102019121068A1 (de) Vorrichtung zur Herstellung einer mehrlagigen Faserstoffbahn

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: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

17P Request for examination filed

Effective date: 20080215

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

17Q First examination report despatched

Effective date: 20080328

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: 20100608