EP0592651A1 - Agencement de caisse de tete pour machines a papier - Google Patents

Agencement de caisse de tete pour machines a papier

Info

Publication number
EP0592651A1
EP0592651A1 EP93911479A EP93911479A EP0592651A1 EP 0592651 A1 EP0592651 A1 EP 0592651A1 EP 93911479 A EP93911479 A EP 93911479A EP 93911479 A EP93911479 A EP 93911479A EP 0592651 A1 EP0592651 A1 EP 0592651A1
Authority
EP
European Patent Office
Prior art keywords
turbulence
headbox according
headbox
generating elements
downstream
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
EP93911479A
Other languages
German (de)
English (en)
Inventor
Karl-Heinz Enderle
Klaus Lehleiter
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 Sulzer Papiermaschinen GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss GmbH
Voith Sulzer Papiermaschinen 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 Sulzer Escher Wyss GmbH, Escher Wyss GmbH, Voith Sulzer Papiermaschinen GmbH filed Critical Sulzer Escher Wyss GmbH
Publication of EP0592651A1 publication Critical patent/EP0592651A1/fr
Ceased legal-status Critical Current

Links

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
    • D21F1/022—Means for injecting material into flow within the headbox
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/026—Details of the turbulence 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
    • D21F1/06—Regulating pulp flow

Definitions

  • the invention relates to a material feed device for a paper machine according to the preamble of claim 1.
  • Headboxes for paper machines have been built for a long time and in many variations.
  • the so-called hydraulic headboxes in which the required turbulence is essentially generated by hydraulic measures, have proven particularly successful.
  • tube bundles or step diffusers can be used, in which the pressure energy present in the feed device is partially converted into kinetic energy, that is to say turbulence.
  • the turbulence generators are often constructed from individual turbulence generating elements connected in parallel.
  • the invention has for its object to provide a headbox with the help of which the flow can be influenced in a particularly effective manner so that the desired flow shape can be set in the suspension jet leaving the headbox without disturbing the basis weight cross-sectional profile setting. Furthermore, the effort for these measures should be as low as possible.
  • the invention takes advantage of the property of the hydraulic turbulence generators commonly used to divide the flow into a plurality of parallel individual flows. If - as described in the claims - the area between two successive turbulence generators is divided into chambers by partitions, the flow conditions can be changed in a targeted manner in these chambers by withdrawing or supplying liquid or gas, in particular air. Because of the partitions, this is differentiated, i.e. for each chamber individually, possible.
  • the pressure can be differentiated by constant and controlled material suspension withdrawal from the above-mentioned chamber in such a way that an optimal flow is generated in the nozzle space, that is to say the space following the last turbulence generator.
  • the supply of stock suspension or water can also - if regulated accordingly will - be used to influence the flow in the nozzle area.
  • Figure 1 shows a headbox according to the invention, side view in section.
  • FIG. 1 top view in section
  • FIG. 3 side view of the headbox in a different position
  • Fig. 4 -6 further embodiments of the fabric on it run, cut in side view.
  • Fig. 1 you can see the essential parts of the substance according to the invention.
  • the pulp intended for paper production can be distributed as an aqueous suspension through the suspension feed device 1 over the entire width of the headbox and from there into a first turbulence generator 2.
  • This consists of a large number of turbulence generating elements 4, shown here using the example of step diffusers. But tube bundle or a thick perforated plate would also be conceivable.
  • This is followed downstream by an intermediate space, which is followed by a further turbulence generator 3 with turbulence generation elements 5.
  • the different turbulence generators can be designed differently.
  • the subsequent nozzle space 7 is suitable for significantly accelerating the suspension flow during operation of the device and discharging it into the sheet formation area of the paper machine (not shown here) through the outlet gap 8 which can be adjusted, for example, with the aid of an indicated aperture 18.
  • the space between two turbulence generators is delimited at the top and bottom by the outer walls 9 and 9 ' and laterally by outer walls 9 "(FIG. 2).
  • This space is divided into several intermediate chambers 6 by the partition walls 10.
  • the upper outer wall 9' is the Opening 11 is visible, as already mentioned, it is one of several, a pipe connection 12 connects this opening to a ring line 13 via a valve 14.
  • the valve 14 is controlled by a regulator 15, which is indicated by arrows indicated signals processed. Such signals can originate from measurements on the paper web formed or can be empirical values.
  • FIG. 2 shows the same device in plan view with cut turbulence generators 2 and 3 and a plurality of intermediate chambers 6 divided by partitions 10. At the end of the suspension feed device 1, an overflow 16 is visible.
  • FIG. 3 shows an arrangement of the headbox directed obliquely downwards towards the paper machine screen 17, as a result of which the suspension feed device 1 has the relatively highest position.
  • the headbox in FIG. 4 has an approximately rectangular deflection of the main flow direction in the area of the intermediate chambers 6. This redirection in particular can be of advantage because it enables the pressure and flow to be evened out.
  • the same figure also shows a further modification, namely the combination of an upstream, highly effective 3-stage turbulence generator and a less effective 2-stage downstream. It is easy to see that the same combination can also bring advantages for headboxes without redirecting the main flow direction.
  • Fig. 5 shows the section of a variant of the headbox acc. Fig. 4.
  • an air cushion L is present in the intermediate chambers 6 above the suspension S and is connected to the tube 12.
  • Such an air cushion can also be useful without redirecting the main flow direction in the intermediate chambers 6.
  • the upstream turbulence generator 2 can also be shorter than the following one.
  • FIG. 6 A further embodiment is shown in FIG. 6.
  • the example there has a smaller number of turbulence generator 2 located upstream
  • Turbulence generating elements than on the downstream 3. This makes the upstream turbulence generator cheaper to manufacture, but is for the intended purpose is still effective enough. In many cases, the suspension is supposed to be deflocculated by relatively rough turbulence.
  • the downstream turbulence generator produces a rather fine, uniform turbulence, which is particularly advantageous for the suspension flowing immediately into the nozzle chamber.
  • the sheet formed then has a uniform, soft formation, as is particularly desired for writing and printing papers.

Landscapes

  • Paper (AREA)

Abstract

Une caisse de tête pour machines à papier comprend au moins deux générateurs de turbulences (2, 3) connectés en série. Entre les générateurs de turbulences est situé un espace intermédiaire subdivisé par des cloisons (10) en chambres intermédiaires (6), dans lesquelles différentes pressions peuvent être réglées. De l'air ou du liquide peut être amené dans ces chambres ou peut être évacué par des ouvertures (110 ménagées dans leurs parois. Ces mesures permettent d'influencer positivement les conditions d'écoulement dans la zone de sortie de la caisse de tête, dans laquelle est situé un faisceau large permettant la pulvérisation dans la partie humide de la machine à papier. Tandis que les exigences en matière de distribution du grammage sont respectées, les fibres sont alignées de manière voulue dans la suspension en écoulement, ce qui permet d'obtenir une bande de papier de haute qualité.
EP93911479A 1992-04-25 1993-04-20 Agencement de caisse de tete pour machines a papier Ceased EP0592651A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19924213707 DE4213707A1 (de) 1992-04-25 1992-04-25 Stoffauflaufeinrichtung für eine Papiermaschine
DE4213707 1992-04-25
PCT/EP1993/000947 WO1993022495A1 (fr) 1992-04-25 1993-04-20 Agencement de caisse de tete pour machines a papier

Publications (1)

Publication Number Publication Date
EP0592651A1 true EP0592651A1 (fr) 1994-04-20

Family

ID=6457512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93911479A Ceased EP0592651A1 (fr) 1992-04-25 1993-04-20 Agencement de caisse de tete pour machines a papier

Country Status (4)

Country Link
EP (1) EP0592651A1 (fr)
DE (1) DE4213707A1 (fr)
FI (1) FI935828A0 (fr)
WO (1) WO1993022495A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0635599B1 (fr) * 1993-07-01 2002-01-23 Metso Paper, Inc. Procédé et dispositif pour la régulation d'une caisse de tête
DE4408713A1 (de) * 1994-03-15 1995-09-21 Escher Wyss Gmbh Verfahren und Vorrichtung zum Führen einer Materialbahn
DE4409415C5 (de) * 1994-03-18 2005-02-17 Voith Sulzer Papiermaschinen Gmbh Dosiervorrichtung für einen Stoffauflauf einer Papiermaschine
EP0683266B1 (fr) * 1994-05-13 1997-09-17 Voith Sulzer Papiermaschinen GmbH Caisse de tête pour une machine à papier avec addition locale de fluide
US5626722A (en) * 1995-06-01 1997-05-06 Valmet Corporation Headbox of a paper/board machine
FI98938C (fi) * 1996-06-20 1997-09-10 Valmet Corp Laitteisto laimennusvirtauksen yhdistämiseksi paperikoneen/kartonkikoneen jakotukista johdettuun massavirtaukseen
DE19652442A1 (de) * 1996-12-17 1998-06-18 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zur Verteilung einer Faserstoffsuspension
FI101726B (fi) * 1997-04-14 1998-08-14 Vaahto Oy Säätövirtausjärjestelmä (menetelmä ja -laite) paperikoneen perälaatiko ssa
IT1315355B1 (it) * 2000-05-30 2003-02-10 Comer Spa Metodo per variare la grammatura in una cassa d'afflusso di macchineper la produzione di carta e cassa d'afflusso atta a realizzare tale
GB2367564B (en) 2000-10-04 2004-02-18 Sandusky Walmsley Ltd Method of and apparatus for distribution of paper stock in paper or board making machinery
DE10208610B4 (de) * 2002-02-27 2014-03-06 Voith Patent Gmbh Verfahren zum Verteilen einer Faserstoffsuspension im Stoffauflauf einer Papier- oder Kartonmaschine und Stoffauflauf
DE102008054894A1 (de) * 2008-12-18 2010-07-01 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008054897A1 (de) * 2008-12-18 2010-07-01 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008054898A1 (de) * 2008-12-18 2010-06-24 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008054896A1 (de) * 2008-12-18 2010-07-01 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE202009010398U1 (de) 2009-07-31 2009-11-05 Voith Patent Gmbh Zudosiereinrichtung und Stoffauflauf mit einer Zudosiereinrichtung
CN103821023A (zh) * 2014-03-03 2014-05-28 广东石油化工学院 一种互补式布浆器

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1236922B (de) * 1962-04-12 1967-03-16 Karlstad Mekaniska Ab Stoffauflauf fuer Papiermaschinen
US3791918A (en) * 1972-03-08 1974-02-12 Valmet Oy Headbox of a paper making machine having multiple, vertically inclined vanes
DE3514554C3 (de) * 1984-09-19 1998-01-08 Escher Wyss Gmbh Stoffauflauf-Vorrichtung für eine Papiermaschine und Verfahren zu deren Betrieb
DE3715554A1 (de) * 1987-05-09 1988-12-01 Voith Gmbh J M Anwendung eines verfahrens zum erzielen einer geschwindigkeitsdifferenz eines stoffsuspensionsstrahles sowie papiermaschine zur durchfuehrung des verfahrens
DE3802298A1 (de) * 1987-06-09 1988-12-22 Peter G Mercer Verfahren und vorrichtung zum verbessern der homogenitaet der faserverteilung beim maschinellen herstellen einer faserstoffbahn
DE3741603A1 (de) * 1987-12-09 1989-06-22 Voith Gmbh J M Stoffauflauf fuer eine papiermaschine od.dgl.
AT392989B (de) * 1988-05-17 1991-07-25 Voith Ag J M Stoffauflauf fuer papiermaschinen
DE4019593C2 (de) * 1990-06-20 1994-01-20 Voith Gmbh J M Stoffauflauf für Papiermaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9322495A1 *

Also Published As

Publication number Publication date
FI935828A (fi) 1993-12-23
DE4213707A1 (de) 1993-10-28
WO1993022495A1 (fr) 1993-11-11
FI935828A0 (fi) 1993-12-23

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