EP0989230B1 - Procédé et dispositif pour tenir propre ou pour nettoyer le conduit de la faible consistance d'un système de caisse de tête - Google Patents

Procédé et dispositif pour tenir propre ou pour nettoyer le conduit de la faible consistance d'un système de caisse de tête Download PDF

Info

Publication number
EP0989230B1
EP0989230B1 EP99112924A EP99112924A EP0989230B1 EP 0989230 B1 EP0989230 B1 EP 0989230B1 EP 99112924 A EP99112924 A EP 99112924A EP 99112924 A EP99112924 A EP 99112924A EP 0989230 B1 EP0989230 B1 EP 0989230B1
Authority
EP
European Patent Office
Prior art keywords
consistency
solid particles
low
stream
proportions
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.)
Expired - Lifetime
Application number
EP99112924A
Other languages
German (de)
English (en)
Other versions
EP0989230A1 (fr
Inventor
Ulrich Begemann
Holger Humberg
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 EP0989230A1 publication Critical patent/EP0989230A1/fr
Application granted granted Critical
Publication of EP0989230B1 publication Critical patent/EP0989230B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 for keeping clean or cleaning the low consistency strand of a consistency controlled headbox system including Constant part of a paper or board machine with at least one high consistency strand and one - optionally sectioned - low consistency strand, where from the headbox to a sieve or between two sieves given final concentration by the mixing ratio of more concentrated and less concentrated Suspension flows is determined.
  • the invention further relates to the headbox system including constant part of a paper or Carton machine with sectioned across the machine width Fabric density control through variable mixing of one more consistent and one less consistent suspension, with a high consistency strand and one Low-consistency stream.
  • Sectional headbox systems are generally known from innumerable patent applications and publications. Reference is made, for example, to the applicant's German laid-open specification DE 40 19 593 A1, which discloses a sectionally regulated headbox with two machine-wide strands of individual feeds for two stock suspensions with different concentrations. Whole substance and white water are preferably used as a suspension of different consistency.
  • the concentration C M of the relevant section flow is corrected by changing the quantity ratio of the control flows fed to a mixer with different solids content Q H / Q L.
  • This type of basis weight cross profile control is very advantageous with respect to a good fiber orientation cross profile and brings very good results with respect to the basis weight cross profile.
  • European patent application EP 0 733 735 A2 discloses the Applicant of a headbox system including constant part of a Paper or board machine with sectioned across the machine width Fabric density control through variable mixing of a more consistent and a low consistent suspension, with a high consistency strand and a low consistency strand. It is envisaged that the Dilution lines or the main power lines or the Partial flow lines connections for the introduction of chemicals, such as Retention agents, or of additional fiber suspensions and Have fine matter suspensions.
  • the inventors have recognized that the deposits and / or Mucilage on line and device walls in the area of low-consistent suspension guides essentially arise from the fact that, in contrast to the highly consistent Hardly any solids are carried in suspensions. hereby can be a relatively large undisturbed on the walls Boundary layer with low flow velocities build up, as a result of which the adhesive and cohesive forces become greater than the flow-related shear forces and it deposits and / or mucilage.
  • An advantageous embodiment of the method provides that simultaneously with the increase in the solids content in the Low consistency strand the corresponding solid particle content of the high consistency strand is reduced, respectively that in a particularly advantageous manner the sum of the supplied solid particles in the low consistency strand equal to the sum of the reduced solid particle proportions of the High consistency strand is.
  • the process can be carried out without Disadvantage used for ongoing production because there is no major disturbance in the basis weight.
  • the mass of the supplied Solid particle proportions of a section in the low consistency strand equal to the reduced mass of this section of the Solid particles of the high consistency strand is. hereby is not only the mean value of the basis weight of the produced paper or cardboard web, but also that Get the basis weight cross profile of the resulting web.
  • Both the low-consistency strand as well as is also possible controls the high consistency strand of solid particles, i.e. controlled or regulated, feed, increasing of the proportion of solid particles in a section in Low consistency strand the quantity distribution in this section between high and low consistency strand is changed.
  • the method according to the invention provides that both the Low consistency strand as well as the high consistency strand Solid particle fractions are supplied in a controlled manner, whereby Increase in the proportion of solid particles in the low-consistency strand the quantity distribution between high and Low consistency strand is changed.
  • the total suspension supply a certain, always constant Total amount of solid particles fed and only for cleaning a "diversion" of the solid particles from High consistency strand made to the low consistency strand become.
  • fibers preferably long fibers, as solid particles
  • They work against compact solid particles long fibers as a kind of liquid brush and lift the Boundary layers particularly well. It can be for example around wood fibers, mostly from the current Fabric production or around fibers from artificial materials act. Artificial fibers have the advantage that in very can be produced in a defined manner and with respect their properties do not vary from one
  • the addition of solid particles in a low consistency strand is done continuously To avoid deposits and / or mucilage per se, or it can also be particularly useful in the production high quality papers are added intermittently to for example, the one produced in this production period Treat paper as inferior paper.
  • a headbox system of a paper or board machine with a material density control sectioned across the machine width by variable mixing of a more consistent and a low-consistent suspension, with a high-consistency strand and a low-consistency strand, with at least one feed in the low-consistency strand
  • the introduction of solid particles into the suspension stream is intended to be further developed such that the throughput of the suspension stream (Q F ) leading to the cleaning or keeping the low-consistency strand (2) of solid particles is regulated or controlled via a metering valve (7).
  • An advantageous embodiment provides that the Low-consistency strand from a variety of sectional There are individual supply lines and one for each individual supply line Feeder for the introduction of solid particles is available.
  • the inventors propose also the high consistency strand with at least one feeder equip for the introduction of solid particles and if necessary also the high consistency strand with a Large number of sectional individual feed lines and each Single feeder a feeder for the introduction of Provide solid particles.
  • FIGS 1-3 show schematic representations of stock density-controlled headbox systems according to the invention with solid particle supply.
  • the headboxes are each loaded with two stock suspension strands, consisting of a high-consistency strand 1, which carries the highly consistent volume flow Q H , and a low-consistency strand 2, which carries the low-consistent volume flow Q L with white water.
  • a further suspension flow Q F with solid particles as pure as possible, preferably fiber components flows into the low-consistency strand 2 via the feed line 3.
  • Figure 1 shows a schematic longitudinal section of a stock density-controlled headbox system.
  • the consistency control takes place via a volume flow control of the low-consistent volume flow Q L which is fed through the feed line 3 into the high-consistency strand 1 and is regulated with the aid of a metering valve 8.
  • the final concentration of the suspension emerging from the headbox is influenced by changing the mixing ratios.
  • the throughput of the suspension flow Q F leading to the cleaning of the lines and solid particles is also regulated or controlled via a metering valve 7. This makes it possible to meter the supply of solid particles in the desired manner, if necessary while maintaining the sum of the volume flows Q L + Q F and, depending on the requirement, to carry out the cleaning intermittently or continuously.
  • FIG. 2 shows a schematic side view of a headbox system sectioned over the machine width, in which all suspension strands - high consistency strand 1, low consistency strand 2 and feed lines for long fibers / solid particles 3 - are sectioned.
  • the three sections shown here as examples represent a much larger number of sections in practice.
  • the sectioned volume flows Q H and Q L in strands 1 and 2 are fed to the headbox with headbox nozzle 6, turbulence generator 5 and prechamber 4, the low-consistent volume flow Q L being controlled section by section via the metering valves 8 and thus the final concentration of the suspension per section being determined ,
  • the sectioned individual low-consistent volume flows Q L which are regulated by metering valves 7, are each supplied with a volume flow Q F , which in itself has a low substance concentration but an increased long fiber content.
  • FIG. 3 shows a schematically represented side view of a further embodiment variant of a headbox system according to the invention with a headbox with a headbox nozzle 6, a turbulence generator 5 and a prechamber 4, into which the mixed streams of high and low-consistent volume streams Q H and Q L are introduced section by section.
  • two volume flows Q F1 and Q F2 which can be regulated via metering valves 7.1 and 7.2, are introduced via the supply lines 3.1 and 3.2 into both the high and the low-consistent volume flow Q H and Q L.
  • the inventive method and the inventive Headbox system will make it possible in the future Keeping clean or cleaning the Low consistency strand of a material density controlled Headbox system including constant part of a Paper or board machine even during operation without disruptive side effects on the production by adding Solid particles, especially long fibers, to perform.

Landscapes

  • Paper (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Claims (17)

  1. Procédé pour tenir propre ou pour nettoyer la ligne à faible consistance d'un système de caisse de tête régulé par la densité des substances incluant la partie constante d'une machine à papier ou à carton comprenant au moins une ligne à haute consistance et une ligne à faible consistance - éventuellement sectionnée -, la concentration finale obtenue par la caisse de tête sur un tamis ou entre deux tamis étant déterminée par le rapport de mélange de courants de suspension à haute concentration et à faible concentration, caractérisé en ce que l'on achemine à la ligne à faible consistance une proportion plus importante de particules solides.
  2. Procédé selon la revendication 1, caractérisé en ce que la proportion de particules solides correspondante de la ligne à haute consistance est simultanément réduite.
  3. Procédé selon la revendication 2, caractérisé en ce que la somme des proportions de particules solides acheminées dans la ligne à faible consistance est égale à la somme des proportions des particules solides réduites de la ligne à haute consistance.
  4. Procédé selon la revendication 2, caractérisé en ce que la masse des proportions de particules solides acheminées d'une section dans la ligne à faible consistance est égale à la masse réduite de cette section des proportions de particules solides de la ligne à haute consistance.
  5. Procédé selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que l'on achemine de manière contrôlée à la ligne à faible consistance ainsi qu'à la ligne à haute consistance des proportions de particules solides, la répartition quantitative entre la ligne à haute consistance et la ligne à faible consistance étant modifiée pour augmenter la proportion de particules solides dans la ligne à faible consistance.
  6. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'on achemine de manière contrôlée à la ligne à faible consistance ainsi qu'à la ligne à haute consistance des proportions de particules solides, la répartition quantitative dans une section entre la ligne à haute consistance et la ligne à faible consistance étant modifiée pour augmenter la proportion de particules solides dans cette section dans la ligne à faible consistance.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'on utilise en tant que particules solides des fibres, de préférence des fibres longues.
  8. Procédé selon la revendication 7, caractérisé en ce que l'on utilise des fibres de bois.
  9. Procédé selon la revendication 7, caractérisé en ce que l'on utilise des fibres de matière synthétique.
  10. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'on utilise en tant que particules solides des particules ayant une forte action de nettoyage.
  11. Procédé selon l'une quelconque des revendications 1 à 10, caractérisé en ce que l'ajout de particules solides dans une ligne à faible consistance s'effectue en continu.
  12. Procédé selon l'une quelconque des revendications 1 à 10, caractérisé en ce que l'ajout de particules solides dans une ligne à faible consistance s'effectue par intermittence.
  13. Système de caisse de tête incluant la partie constante d'une machine à papier ou à carton avec une régulation de la densité de substance sectionnée sur toute la largeur de la machine réalisée par mélange variable d'une suspension à haute consistance et d'une suspension à faible consistance, avec une ligne à haute consistance (1) et une ligne à faible consistance (2), dans lequel, dans la ligne à faible consistance (2), au moins une alimentation (3) pour l'introduction de proportions de particules solides est prévue dans le courant de suspension, caractérisé en ce que le débit du courant de suspension (QF) conduisant des proportions de particules solides pour le nettoyage ou pour tenir propre la ligne à faible consistance (2) est régulé ou commandé par le biais d'une soupape de dosage (7).
  14. Système de caisse de tête selon la revendication 13, caractérisé en ce que la ligne à faible consistance (2) se compose d'une pluralité de conduites d'alimentation individuelles sectionnelles et pour chaque conduite d'alimentation individuelle est prévue une alimentation (3.1) pour l'introduction de proportions de particules solides.
  15. Système de caisse de tête selon l'une quelconque des revendications 13 à 14, caractérisé en ce que la ligne à haute consistance (1) présente également au moins une alimentation (3.2) pour l'introduction de proportions de particules solides.
  16. Système de caisse de tête selon la revendication 15, caractérisé en ce que la ligne à haute consistance (1) se compose d'une pluralité de conduites d'alimentation individuelles sectionnelles et pour chaque conduite d'alimentation individuelle est prévue une alimentation pour l'introduction de proportions de particules solides.
  17. Système de caisse de tête selon l'une quelconque des revendications 13 à 16, caractérisé en ce que pour chaque alimentation (3 ; 3.1 ; 3.2) pour l'introduction de proportions de particules solides, on prévoit une soupape (7 ; 7.1 ; 7.2) pour le dosage de la quantité acheminée.
EP99112924A 1998-09-24 1999-07-05 Procédé et dispositif pour tenir propre ou pour nettoyer le conduit de la faible consistance d'un système de caisse de tête Expired - Lifetime EP0989230B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843728 1998-09-24
DE19843728A DE19843728A1 (de) 1998-09-24 1998-09-24 Verfahren und Vorrichtung zur Reinhaltung beziehungsweise Reinigung des Niederkonsistenzstrangs eines Stoffauflaufsystems

Publications (2)

Publication Number Publication Date
EP0989230A1 EP0989230A1 (fr) 2000-03-29
EP0989230B1 true EP0989230B1 (fr) 2003-12-17

Family

ID=7882030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99112924A Expired - Lifetime EP0989230B1 (fr) 1998-09-24 1999-07-05 Procédé et dispositif pour tenir propre ou pour nettoyer le conduit de la faible consistance d'un système de caisse de tête

Country Status (4)

Country Link
US (1) US6214170B1 (fr)
EP (1) EP0989230B1 (fr)
AT (1) ATE256782T1 (fr)
DE (2) DE19843728A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102168390A (zh) * 2011-05-06 2011-08-31 华南理工大学 一种调节纸张横幅定量和纤维取向的装置
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

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3741603A1 (de) 1987-12-09 1989-06-22 Voith Gmbh J M Stoffauflauf fuer eine papiermaschine od.dgl.
US5707495A (en) 1990-06-20 1998-01-13 J.M. Voith Gmbh Headbox for papermaking machine with more uniform flow
DE4019593C2 (de) * 1990-06-20 1994-01-20 Voith Gmbh J M Stoffauflauf für Papiermaschinen
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
DE4239845C2 (de) 1992-11-05 1998-12-03 Voith Gmbh J M Verfahren zur Messung der Auswirkung von Verstellungen am Stoffauflauf und zur Korrektur des Flächengewichts- und Faserorientierungs-Querprofils
DE4402516C2 (de) * 1993-07-05 1997-11-20 Voith Gmbh J M Vorrichtung und Verfahren zur verstopfungsfreien Drosselung einer fluiden Suspensionsströmung
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
DE4410556A1 (de) * 1994-03-26 1994-08-11 Voith Gmbh J M Verfahren und Vorrichtung zur Reinhaltung von Wandungen im Bereich der Stoffzuführung zum Stoffauflauf einer Papiermaschine
DE4422907C2 (de) * 1994-06-30 1997-03-06 Voith Gmbh J M Sektionale Stoffzuführung des Stoffauflaufs einer Papiermaschine
DE19509522C2 (de) * 1995-03-20 1999-03-11 Voith Sulzer Papiermasch Gmbh Naßpartie einer Papiermaschine
US6113741A (en) * 1996-12-06 2000-09-05 Eka Chemicals Ab Process for the production of paper

Also Published As

Publication number Publication date
EP0989230A1 (fr) 2000-03-29
US6214170B1 (en) 2001-04-10
DE19843728A1 (de) 2000-03-30
ATE256782T1 (de) 2004-01-15
DE59908079D1 (de) 2004-01-29

Similar Documents

Publication Publication Date Title
EP0789107B1 (fr) Caisse de tête de machines à papier
EP0824157B1 (fr) Caisse de tête et procédé pour la répartition d'une suspension fibreuse dans la caisse de tête d'une machine à papier
DE69913450T2 (de) Stoffauflauf zur Verteilung von Faserstoffsuspension und Zusatzstoffe
DE4005281C2 (de) Stoffauflauf mit Regelung des Flächengewicht-Querprofiles über die Verdünnung der Fasersuspension
EP0995834B1 (fr) Procédé et dispositif pour améliorer le profil transversal du rétrécissement dans une machine à papier
DE3244142A1 (de) Verfahren und vorrichtung zur herstellung einer mehrschicht-papierbahn
DE4416909A1 (de) Verfahren zur lokalen Zumischung von Fluid in einen Stoffauflauf für eine Papiermaschine sowie Stoffauflauf zu seiner Durchführung
EP0992625B1 (fr) Système de caisse de tête et procédé pour l'amélioration du profil transversal de la consistence d'une bande fibreuse
DE69912761T2 (de) Verfahren und vorrichtung zur herstellung von cellulosebrei mit verbesserten eigenschaften
EP0624685A1 (fr) Caisse de tête pour une machine à papier
EP0989230B1 (fr) Procédé et dispositif pour tenir propre ou pour nettoyer le conduit de la faible consistance d'un système de caisse de tête
DE4125513A1 (de) Verfahren zum vermischen von suspendiertem faserstoff sowie vorrichtungen zu dessen ausfuehrung
DE2548795C3 (de) Maschine zur Herstellung von bahnförmigem Material
DE4422907C2 (de) Sektionale Stoffzuführung des Stoffauflaufs einer Papiermaschine
DD296722A5 (de) Verfahren und vorrichtung zur erzeugung von zellulosebrei mit verbeserter qualitaet
DE19632673A1 (de) Stoffauflauf und Verfahren zur Verteilung einer Faserstoffsuspension im Stoffauflauf einer Papiermaschine
EP1126077A2 (fr) Procédé et dispositif pour la préparation de la pâte
DE4433445C1 (de) Stoffauflauf einer Papiermaschine
DE102005051656A1 (de) Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn
DE19906062A1 (de) Verfahren und Vorrichtung zur Herstellung einer Materialbahn
DE19909379C2 (de) Anordnung an Papiermaschinen zur Einstellung des Flächengewichts-Querprofils mit Verdünnungswasser
EP0971069B1 (fr) Circuit de mélange et de recirculation
DE3434241C2 (de) Verfahren und Vorrichtung zum Reinigen und Eindicken einer Fasersuspension
DE19928488C1 (de) Verfahren zur dosierbaren Verdünnung der Faserstoffsuspension in oder vor einem Stoffauflauf einer Papiermaschine
EP1342834A2 (fr) Procédé et caisse de tête pour une machine de fabrication d' une bande fibreuse

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 DE FI SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20000929

AKX Designation fees paid

Free format text: AT DE FI SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: VOITH PAPER PATENT GMBH

17Q First examination report despatched

Effective date: 20020614

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FI SE

REF Corresponds to:

Ref document number: 59908079

Country of ref document: DE

Date of ref document: 20040129

Kind code of ref document: P

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20040920

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20110714

Year of fee payment: 13

Ref country code: SE

Payment date: 20110722

Year of fee payment: 13

Ref country code: FI

Payment date: 20110714

Year of fee payment: 13

Ref country code: DE

Payment date: 20110722

Year of fee payment: 13

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 256782

Country of ref document: AT

Kind code of ref document: T

Effective date: 20120705

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130201

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120706

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120705

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120705

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59908079

Country of ref document: DE

Effective date: 20130201