EP0992625A1 - Système de caisse de tête et procédé pour l'amélioration du profil transversal de la consistence d'une bande fibreuse - Google Patents

Système de caisse de tête et procédé pour l'amélioration du profil transversal de la consistence d'une bande fibreuse Download PDF

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Publication number
EP0992625A1
EP0992625A1 EP99112904A EP99112904A EP0992625A1 EP 0992625 A1 EP0992625 A1 EP 0992625A1 EP 99112904 A EP99112904 A EP 99112904A EP 99112904 A EP99112904 A EP 99112904A EP 0992625 A1 EP0992625 A1 EP 0992625A1
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EP
European Patent Office
Prior art keywords
suspension
fiber
flow
composition
suspensions
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
EP99112904A
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German (de)
English (en)
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EP0992625B1 (fr
Inventor
Ulrich Begemann
Dirk Thomas
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
Voith Sulzer Papiertechnik 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.)
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Publication date
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Publication of EP0992625A1 publication Critical patent/EP0992625A1/fr
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Publication of EP0992625B1 publication Critical patent/EP0992625B1/fr
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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
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a method and a Headbox system to improve the consistency cross profile a fibrous web, in particular a paper or cardboard web, in the wet process according to the preamble of the first Process claim, or according to the preamble of the device claim.
  • EP 0 600 251 B1 ( ⁇ US 5,401,363) is known to remedy a uneven cross-consistency profile of a paper web - originated from varying degrees of sieve wear - the Headbox sectioned across the machine width supply different amounts of retention aid. On however, such a procedure will not be successful if the original consistency of the stock suspension already over the Machine width is unequal.
  • the object of the invention is characterized by the features of both first procedural claim and the first Device claim solved.
  • the inventors propose the known process for producing a fibrous web, in particular a paper or cardboard web, in the wet process, in which the fiber suspension is distributed over the width of the machine to a sieve or between two sieves with the aid of a headbox, and the basis weight cross-section is influenced at least in part by a sectionally variable mixture of a first suspension Q 1 with a given solids content and a given percentage composition of different solids components and a second suspension Q 2 with a lower or higher solids content, the percentage composition of the solids components of the second suspension of the composition of the first suspension differs to improve in that at least a third suspension Q 3 with a lower or higher solids content is mixed sectioned across the machine width, the percentage Composition of the solids content of the third suspension differs from the composition of the first and / or second suspension.
  • first suspension Q 1 is normal stock suspension (whole stock) and / or the second suspension Q 2 is white water and / or the third suspension Q 3 is clear filtrate and / or clear water and / or dilute retention agent and / or white water other sections of the wire section and / or Q 1 is used.
  • suspensions can differ in terms of their proportion Filling material and / or by their share of fibers differentiate.
  • Suspensions differ due to their fiber content of different lengths and / or by their percentage of fibers with different shrinkage influences on the fiber web differentiate in the further manufacturing process.
  • a special and advantageous embodiment of the method is that the second suspension Q 2 is designed so that it contains predominantly or exclusively fiber components, and that the third suspension Q 3 is designed so that it contains predominantly or exclusively filler components.
  • a solid composition is achieved which corresponds to the solid composition of the first suspension but has a different concentration of solids.
  • a targeted shift in the mixing ratio Q 2 / Q 3 of the second and third suspensions then causes a shift in the solids composition in the direction of fillers or fibers.
  • the second suspension Q 2 predominantly contains fiber components with a high tendency to shrink
  • the third suspension Q 3 predominantly contains fiber components with a low tendency to shrink
  • a fourth suspension Q 4 mainly contains filler components and, if appropriate, a fifth suspension Q 5 retention agent .
  • a headbox of a paper or Carton machine with sectioned fabric density control over the Machine width through variable mix of a first and a second suspension with different Solids concentrations which are preferably a first machine wide feeder or a first set of Single feeds for the first suspension, a second Set of individual feeds with flow-influencing Means for the second suspension, a turbulence-generating Section and includes a nozzle section to that effect to further develop that upstream of the turbulence-generating section and / or section in the z direction at least a third has the same effect as the fiber web Set of individual feeds with flow-influencing Means for a third suspension is provided, the Solid composition according to those made above Execution of the method according to the invention differs.
  • FIGS. 1a-1c show schematic representations of the suspension feed according to the invention to a headbox with three sets of feeds and their sectional merging before the headbox.
  • three material suspensions Q H , Q L and Q C are mixed with different filler proportions and compositions. Specifically, whole material with a high proportion of fillers is led in the sectioned main stream Q H and two sectioned suspension streams with white water Q L and clear water Q C are introduced into the section lines.
  • the white water and clear water flows are controlled or regulated with metering valves per section with regard to their volume flow.
  • FIGS. 2a-2c show the supply of three different headbox suspensions with two Sets of feeds before the headbox and one set Feeding into a turbulence generator Headbox chamber.
  • a known stock density-controlled headbox with two sets of sectional feeds of stock and white water before the actual headbox is shown.
  • a third set of sectional suspension flows with clear water Q C is mixed into a chamber upstream of the turbulence generator. So that the admixture in this area of the headbox does not result in any undesirable changes in the sectional total volume flows Q G , metering must either take place at a certain angle which does not influence the total volume flow, or the supplied sectional total volume flow Q S must be provided by additional valves Q H + Q L can be varied.
  • the above-described headbox systems can be used to regulate the dilution of the basis weight cross-section, which allows a desired and specific, section-wise change in the composition of the total volume flow Q G applied to a headbox .
  • sections of the suspension feeds shown in three sections should only represent the principle, in practical execution, however, mostly an essential one smaller subdivision into much more sections takes place.
  • the width of the individual sections vary across the machine width. So may have a smaller subdivision in the edge area, for example be chosen as in the middle range, since usually the largest Error gradient occurs in the edge areas, while in middle area with smaller error sizes per width too to calculate.

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  • Paper (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP99112904A 1998-09-24 1999-07-05 Système de caisse de tête et procédé pour l'amélioration du profil transversal de la consistence d'une bande fibreuse Expired - Lifetime EP0992625B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843727 1998-09-24
DE19843727A DE19843727A1 (de) 1998-09-24 1998-09-24 Verfahren und Stoffauflaufsystem zur Verbesserung des Konsistenzquerprofils einer Faserbahn

Publications (2)

Publication Number Publication Date
EP0992625A1 true EP0992625A1 (fr) 2000-04-12
EP0992625B1 EP0992625B1 (fr) 2003-12-03

Family

ID=7882029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99112904A Expired - Lifetime EP0992625B1 (fr) 1998-09-24 1999-07-05 Système de caisse de tête et procédé pour l'amélioration du profil transversal de la consistence d'une bande fibreuse

Country Status (6)

Country Link
US (1) US6299731B1 (fr)
EP (1) EP0992625B1 (fr)
JP (1) JP4546593B2 (fr)
AT (1) ATE255655T1 (fr)
CA (1) CA2283009A1 (fr)
DE (2) DE19843727A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100400745C (zh) * 2006-07-07 2008-07-09 华南理工大学 一种添加稀释水粗调与微调纸张横幅定量的装置
DE102009028135A1 (de) 2008-08-12 2010-03-11 Metso Paper, Inc. Verfahren und System zur Optimierung von Eigenschaften einer Faserbahn

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10331040A1 (de) * 2003-07-09 2005-01-27 Voith Paper Patent Gmbh Stoffauflauf
DE10351295A1 (de) * 2003-10-31 2005-06-02 Voith Paper Patent Gmbh Verfahren zum Erzeugen einer Faserstoffbahn und Vorrichtung zur Durchfühung des Verfahrens
DE102005051656A1 (de) * 2005-10-28 2007-05-03 Voith Patent Gmbh Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn
DE102009001731A1 (de) * 2009-03-23 2010-09-30 Voith Patent Gmbh Verfahren zur Einstellung eines Flächengewichtsquerprofils einer Faser- oder Vliesstoffbahn und Maschine zur Herstellung einer Faser- oder Vliesstoffbahn
FI122113B (fi) 2010-02-03 2011-08-31 Metso Paper Inc Menetelmä ja perälaatikko kuiturainan poikkisuuntaisen ominaisuusprofiilin parantamiseksi
CN106758471B (zh) * 2017-02-09 2018-05-15 华南理工大学 一种改变稀释水浓度调节纸张横幅定量的装置及方法
DE102022107202A1 (de) * 2022-03-28 2023-09-28 Voith Patent Gmbh Mehrlagenfaserstoffbahn

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4019593A1 (de) * 1990-06-20 1992-01-09 Voith Gmbh J M Stoffauflauf fuer papiermaschinen
EP0824157A2 (fr) * 1996-08-14 1998-02-18 Voith Sulzer Papiermaschinen GmbH Caisse de tête et procédé pour la répartition d'une suspension fibreuse dans la caisse de tête d'une machine à papier

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4940512A (en) * 1988-08-18 1990-07-10 E. I. Du Pont De Nemours And Co.Ny Cross-directional distribution of additives in synthetic papers
US5707495A (en) 1990-06-20 1998-01-13 J.M. Voith Gmbh Headbox for papermaking machine with more uniform flow
DE4211290C2 (de) 1992-04-03 1994-07-07 Voith Gmbh J M Mischeinrichtung mit veränderlichen Rohrquerschnitten zum Mischen von zwei Flüssigkeiten bei konstantem Gemischvolumenstrom zur Versorgung des Stoffauflaufs einer Papiermaschine
DE4211291C3 (de) 1992-04-03 2001-06-07 Voith Gmbh J M Mischeinrichtung und Verfahren zum Mischen von zwei Flüssigkeiten bei konstantem Gemischvolumenstrom zur Versorgung des Stoffauflaufs einer Papiermaschine
DE4237309A1 (fr) 1992-11-05 1993-04-08 Voith Gmbh J M
FI92229C (fi) * 1993-07-01 1994-10-10 Valmet Paper Machinery Inc Menetelmä ja laite perälaatikon säädössä
DE4323263C2 (de) * 1993-07-12 2001-11-29 Voith Paper Patent Gmbh Verfahren zur sektionalen Beeinflussung der Stoffdichte und der Faserorientierung in einem Stoffauflauf einer Papiermaschine und Stoffauflauf zur Durchführung des Verfahrens
US5560807A (en) 1995-03-29 1996-10-01 Beloit Technologies, Inc. Headbox additive injection system
FI100345B (fi) * 1997-01-24 1997-11-14 Valmet Corp Menetelmä ja laite paperikoneen perälaatikon säädössä
JPH11350369A (ja) * 1998-06-03 1999-12-21 Ishikawajima Harima Heavy Ind Co Ltd 抄紙原料への薬剤投入装置
US6117272A (en) * 1998-09-03 2000-09-12 Voith Sulzer Papiermaschinen Device and process for metering auxiliary materials into the flow box of a paper machine
DE19843729A1 (de) 1998-09-24 2000-03-30 Voith Sulzer Papiertech Patent Verfahren und Vorrichtung zur Verbesserung des Schrumpfungs-Querprofils

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4019593A1 (de) * 1990-06-20 1992-01-09 Voith Gmbh J M Stoffauflauf fuer papiermaschinen
EP0824157A2 (fr) * 1996-08-14 1998-02-18 Voith Sulzer Papiermaschinen GmbH Caisse de tête et procédé pour la répartition d'une suspension fibreuse dans la caisse de tête d'une machine à papier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100400745C (zh) * 2006-07-07 2008-07-09 华南理工大学 一种添加稀释水粗调与微调纸张横幅定量的装置
DE102009028135A1 (de) 2008-08-12 2010-03-11 Metso Paper, Inc. Verfahren und System zur Optimierung von Eigenschaften einer Faserbahn

Also Published As

Publication number Publication date
EP0992625B1 (fr) 2003-12-03
JP2000096474A (ja) 2000-04-04
DE59907923D1 (de) 2004-01-15
DE19843727A1 (de) 2000-03-30
CA2283009A1 (fr) 2000-03-24
JP4546593B2 (ja) 2010-09-15
US6299731B1 (en) 2001-10-09
ATE255655T1 (de) 2003-12-15

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