EP0967323B1 - Section de formage à deux toiles - Google Patents

Section de formage à deux toiles Download PDF

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Publication number
EP0967323B1
EP0967323B1 EP99101848A EP99101848A EP0967323B1 EP 0967323 B1 EP0967323 B1 EP 0967323B1 EP 99101848 A EP99101848 A EP 99101848A EP 99101848 A EP99101848 A EP 99101848A EP 0967323 B1 EP0967323 B1 EP 0967323B1
Authority
EP
European Patent Office
Prior art keywords
wire
twin
fourdrinier
mesh belt
bar
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
EP99101848A
Other languages
German (de)
English (en)
Other versions
EP0967323A3 (fr
EP0967323A2 (fr
Inventor
Johann Moser
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 EP0967323A2 publication Critical patent/EP0967323A2/fr
Publication of EP0967323A3 publication Critical patent/EP0967323A3/fr
Application granted granted Critical
Publication of EP0967323B1 publication Critical patent/EP0967323B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention relates to a twin wire former for forming a fibrous web according to the preamble of claim 1.
  • a twin wire former has two endless, rotating wire belts which together form a twin wire zone.
  • the fibrous web forms between the two wire belts.
  • the two wire belts run together over a forming roller, one wire belt, namely the “inner” wire belt, coming into direct contact with the forming roller.
  • the other wire belt namely the "outer” wire belt, comes into contact with at least one support device extending transversely over the wire belt, here with a bar. In special cases, this bar can be rigidly fixed in the machine frame.
  • the outer sieve belt can preferably be resiliently pressed onto the outer sieve belt (for example by means of a pneumatic hose).
  • a temporary divergence of the two sieve belts should be prevented by means of the bar at the drain point mentioned.
  • Such a divergence of the two sieve belts can occasionally be observed, although the sieve belts are stretched in the running direction. The result is that proper formation of the fibrous web is disturbed.
  • the resilient pressing of the bar provides the advantage that the position of the bar automatically adapts to the current layer thickness of the fiber suspension located between the two sieve belts. In a similar form, this is also disclosed in WO 95/34713.
  • the prior art arrangements described above have not yet proven to be sufficiently effective. Occasionally one still observes disturbances of an orderly path formation.
  • the invention is therefore based on the object of a twin wire former described design to improve that the disturbances mentioned be avoided in the quality of the finished paper.
  • the support device is a bar, the one the sliding surface touching the outer sieve belt and a sliding surface in thereon Screen direction seen-adjoining foil surface, for the purpose of generating Vacuum diverges from the outer screen belt.
  • the effect of the inventive design of the negative pressure zone is based on the fact that a similar negative pressure develops in the gusset, which always is present between the running inner screen belt and the jacket of the Forming roll.
  • the sliding surface of the foil strip touching the outer screen belt resiliently pressed onto the outer screen belt.
  • the foil strip (seen in a cross section through the foil strip) in its downstream Area by means of a joint on a fixed or on an adjustable Support component and in its upstream area by means of a flexible Press the adjusting device (e.g. pneumatic hose) onto the outer sieve belt.
  • a breast roller 13 and a forming roller can be seen from a twin wire former 14 and two screen belts 11 and 12, which - starting on the forming roller 14 - form a twin wire zone with each other.
  • the one screen belt 12 is the so-called inner screen belt, which is in direct contact comes with the forming roller 14.
  • the other sieve belt 11 is the so-called outer one screen belt; it comes into direct contact with the breast roller 13 and runs from it to the forming roller 14.
  • a headbox 10 guides a fiber suspension jet into the (from the two sieve belts 11 and 12 formed) inlet gusset. Loop around the two sieve belts 11 and 12 now together a relatively small area of the jacket of the forming roller 14; A suction zone 14a can be located in this area.
  • a support device 9 which is shown in Figure 1 as a so-called Foil bar is formed.
  • This has an outer screen belt 12 touching Slide surface 9a and a foil surface 9b adjoining it in the direction of wire travel. The the latter diverges at a small angle of, for example, 1 to 5 ° from the outside Sieve belt 12. This results from the movement of the sieve belts between the Foil area 9b and the outer screen belt 11 a negative pressure zone.
  • the foil bar 9 is part of a drainage box 8, for example Guide the sieve belts has further strips 8a.
  • a bearing block 7a To support the foil bar on the drainage box 8, a bearing block 7a, the downstream Supported area of the foil bar 9 by means of a joint 7.
  • the upstream area the foil strip 9 with the sliding surface 9a is by means of a pneumatic hose 6 (with finely adjustable power) resiliently pressed onto the outer sieve belt 11.
  • the sliding surface 9a of the foil bar 9 is in the immediate vicinity of the drain point of the two screen belts 11 and 12 from the forming roller 14.
  • the outer sieve belt 11 Contacting sliding surface 9a by a small amount x downstream from (ie behind) the Arrange drain point A.
  • An arrangement of the sliding surface 9a in front of the drain point A is also possible.
  • FIG. 3 shows a schematic Side view of a complete twin wire former, again with a headbox 10, two endless sieve belts 11 and 12, breast roll 13 and forming roll 14, from the two sieve belts to a small sector a (with an angle between 10 and 40 °) is entwined.
  • the two fabric belts run from the forming roller 14 (together with the fibrous web that forms in between) via a first Suction roller 18 and then a second suction roller 19.
  • the inner part separates Screen belt 12 from the fibrous web and runs back over guide rolls 22 to the forming roll 14.
  • the outer screen belt 11 continues the fibrous web until the fibrous web removed from the sieve belt by means of a take-off felt 23 and a take-off roller 24 becomes.
  • the outer screen belt 11 runs over guide rollers 21 back to the breast roller 13.
  • In the loop of the (lower) outer sieve belt 11 there is one pivotable support device 15 '.
  • Foilark 9 arranged, also two compliant to the Umschlingunszone the forming roller 14 pressable formation strips 15.
  • the arrangement is made such that the outer sieve belt 11 is a lower sieve and that the inner sieve belt 12th is a top sieve.
  • the foil bar 9 is from bottom to top in the direction of the forming roller 14 pressed against the lower sieve 11.
  • the two sieve belts run from the forming roller 14, obliquely upwards.
  • the outer screen belt 11 comes with a Foil strip 9 in contact, which (as described above) with the outer sieve belt 11 Vacuum zone forms.
  • the outer sieve belt 11 is a top sieve and the inner sieve belt 12 a bottom sieve, so that the foil strip 9 from top to bottom to the top sieve 11 is pressed.
  • the foil strip 9 is in turn fixed by means of a joint 7 Component supported, which in the present case as an upper drainage box 38 is formed. This is bulged down slightly (with one large radius of curvature R).
  • a series of strips 28 which are fixedly connected to the box 38 and over which the outer screen belt 11 slides.
  • vacuum chambers 32 are formed in the box.
  • Within the loop of the inner screen belt 12 is a lower drainage box 37 provided.
  • FIG. 5 shows a more compact design compared to FIG. 4, in which the separating suction device 33 does not apply.
  • the drain box 38 ' has an additional vacuum chamber 32 '; the screen suction roller 30 is arranged immediately behind this.
  • the twin wire former shown in FIG. 6 again comprises two wire belts 11 and 12.
  • the inner sieve belt 12 forms a lower sieve and the outer sieve belt 11 is a top sieve.
  • the top wire 11 on the circumference of the forming roller 14 comes into contact with the lower sieve 12, it runs over a breast roller 13.
  • the two screen belts 11 and 12 form together a wedge-shaped inlet gap, which is directly from a headbox 10 Fibrous suspension absorbs.
  • the headbox is only indicated schematically. It is preferably a Headbox, which in a known manner with a sectionally controllable dilution water addition is equipped for the purpose of setting a desired basis weight cross section the finished paper web.
  • the twin-wire former has within the loop of the upper wire 11 in the area of Forming roller 14, a water collecting device 36. It first arrives there large part of the suspension water, which at the beginning of the twin sieve zone Upper sieve 11 penetrates. This is done essentially in the upper descending quadrant the forming roll 14. Approximately at the level of the film roll axis of rotation the two sieves 11 and 12 run with the fibrous web formed between them down from the forming roller. They then run over one in the loop of the Upper sieve 12 arranged, and formed from strips 8a convex curved forming shoe. Further suspension water penetrates into the collecting trough between the strips 8a 36. Another part of the suspension water flows through the lower sieve 11 in a drip pan 40.
  • molding strips can be provided, which are known in the art Can be resiliently pressed onto the lower sieve 12 (not shown in FIG. 6). Instead of these forming strips, the bottom wire 12 can be in the area of the strips 8a at least one deflector can be assigned.
  • the jacket of the forming roller 14 has recesses for temporary use in a known manner Storing water, e.g. in the form of a honeycomb cover and one on it attached sieve stocking.
  • the forming roller 14 can be designed as a suction roller, with vacuum source 29. Also arranged in the loop of the top wire 11 Water collecting device 36 can be connected to a vacuum source 29 'if necessary his. According to the invention at the outlet of the sieve belts 11, 12 of the forming roll 14 arranged a vacuum bar 9, with the help of of the features described in FIG. 1.
  • the twin-wire zone forms one with an imaginary vertical plane Angle a, which is between 10 and 50 degrees, in this section the top sieve 11 is always located above the lower sieve 12.
  • the angle a is preferably less than 45 degrees.
  • further drainage elements can be provided, e.g. the lower sieve 12 touching suction boxes 47.
  • Deflection roller 42 is provided, which essentially transforms the two screen belts 11, 12 into one horizontal direction deflected.
  • Separating suction device 33 is provided, on which the upper sieve 11 is separated from the lower sieve 12 and the paper web on it lifts off.
  • the top wire 11 runs from here over guide rollers 46 back to the breast roll 13.
  • the bottom wire 12 runs after the separating suction device 33 - If necessary via at least one further suction box 37 '- to a screen suction roll 30, then via guide rollers 41 back to the forming roller 14.
  • the paper web formed in a known manner by means of a Felt 23 and a take-off roller 24 removed from the lower wire 11.
  • the foil strip 9 according to the invention in connection with steep sieve belts running below can also be used in a twin-wire former according to the German published application DE / A1 19651493; this is for education a multilayer paper web arranged on a long screen.

Landscapes

  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Claims (9)

  1. Section de formage à deux toiles pour la formation d'une nappe fibreuse, par exemple une nappe de papier, à partir d'une suspension fibreuse, en particulier faisant partie d'une machine de fabrication de papier, comprenant les caractéristiques suivantes :
    a) deux bandes de toile périphériques sans fin (11, 12) forment l'une avec l'autre une zone à deux toiles, dans laquelle se forme la nappe fibreuse entre les deux bandes de toile (11, 12) ;
    b) dans la zone à deux toiles, les deux bandes de toile (11, 12) passent conjointement sur un cylindre de formage (14), l'une des bandes de toile, à savoir la bande de toile "intérieure" (12) venant en contact direct avec le cylindre de formage (14) ;
    c) dans la région du point de sortie des deux bandes de toile (11, 12) du cylindre de formage (14), l'autre bande de toile, à savoir la bande de toile "extérieure" (11), vient en contact avec au moins un dispositif de support (9) s'étendant transversalement sur la bande de toile, le dispositif de support (9) exerçant une dépression sur la bande de toile extérieure (11) ;
    caractérisée en ce que le dispositif de support est une racle (9) qui présente une surface de glissement (9a) en contact avec la bande de toile extérieure (11) et une surface de feuille (9b) s'y raccordant, vue dans la direction d'avance de la toile, qui diverge de la bande de toile extérieure (11) aux fins de la production de la dépression.
  2. Section de formage à deux toiles selon la revendication 1, caractérisée en ce que la racle (9) peut être pressée sur sa surface de glissement (9a) de manière élastique contre la bande de toile extérieure (11).
  3. Section de formage à deux toiles selon la revendication 2, caractérisée en ce que - vue en section transversale à travers la racle (9) - la partie aval de la racle (9) est supportée par une articulation (7), tandis que la partie amont de la racle (9) est supportée au moyen d'un dispositif de réglage élastique, par exemple au moyen d'un tuyau souple pneumatique (6).
  4. Section de formage à deux toiles selon la revendication 3, caractérisée en ce que la distance de l'articulation (7) par rapport à la bande de toile extérieure (11) est variable, afin de pouvoir adapter l'angle d'inclinaison entre la surface de la feuille (9b) et la bande de toile extérieure (11) et ainsi l'intensité de la dépression créée.
  5. Section de formage à deux toiles selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la position du dispositif de support (9) est essentiellement variable parallèlement à la direction d'avance de la toile (flèche P).
  6. Section de formage à deux toiles selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le dispositif de support (9) est disposé dans la boucle d'une toile inférieure (11) et le cylindre de formage (14) est disposé dans la boucle d'une toile supérieure (12).
  7. Section de formage à deux toiles selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le dispositif de support (9) est disposé dans la boucle d'une toile supérieure (12) et le cylindre de formage (14) est disposé dans la boucle d'une toile inférieure (11).
  8. Section de formage à deux toiles selon la revendication 7, caractérisée en ce que les toiles (11, 12) s'étendent de bas en haut entre le cylindre de formage (14) et le dispositif de support (9).
  9. Section de formage à deux toiles selon la revendication 7, caractérisée en ce que les toiles (11, 12) s'étendent de haut en bas entre le cylindre de formage (14) et le dispositif de support (9).
EP99101848A 1998-06-25 1999-01-28 Section de formage à deux toiles Expired - Lifetime EP0967323B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19828237 1998-06-25
DE19828237A DE19828237A1 (de) 1998-06-25 1998-06-25 Doppelsiebformer

Publications (3)

Publication Number Publication Date
EP0967323A2 EP0967323A2 (fr) 1999-12-29
EP0967323A3 EP0967323A3 (fr) 2000-01-05
EP0967323B1 true EP0967323B1 (fr) 2003-01-02

Family

ID=7871926

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99101848A Expired - Lifetime EP0967323B1 (fr) 1998-06-25 1999-01-28 Section de formage à deux toiles

Country Status (4)

Country Link
US (1) US6254727B1 (fr)
EP (1) EP0967323B1 (fr)
AT (1) ATE230454T1 (fr)
DE (2) DE19828237A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10343914A1 (de) * 2003-09-19 2005-05-04 Voith Paper Patent Gmbh Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren
DE102004000068A1 (de) * 2004-12-30 2006-07-13 Voith Paper Patent Gmbh Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn
FI20065142L (fi) * 2006-02-28 2007-08-29 Metso Paper Inc Imulaatikon etäisyyden säätö vastatelasta
FI120796B (fi) * 2006-03-31 2010-03-15 Metso Paper Inc Imulaatikon etäisyyden säätö vastatelasta
WO2019043608A1 (fr) * 2017-09-01 2019-03-07 Stora Enso Oyj Procédé de production de carton, carton, et carton ondulé

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH601556A5 (fr) * 1975-10-03 1978-07-14 Escher Wyss Gmbh
DE3815316C2 (de) * 1988-05-05 1996-02-01 Voith Sulzer Papiermasch Gmbh Vorrichtung zur Entwässerung an einem Doppelsieb-Former
DE4026953C2 (de) * 1990-01-26 1995-11-30 Escher Wyss Gmbh Entwässerungsvorrichtung und Verfahren zur Entwässerung an einem Doppelsiebformer
DE9105328U1 (de) * 1991-04-30 1991-07-04 J.M. Voith Gmbh, 7920 Heidenheim Stationäre Stützvorrichtung
FI920228A0 (fi) 1992-01-17 1992-01-17 Valmet Paper Machinery Inc Banformningsparti foer pappersmaskin.
US5573643A (en) 1992-01-17 1996-11-12 Valmet Corporation Twin wire web former in a paper machine
DE4328024A1 (de) * 1993-08-20 1995-02-23 Voith Gmbh J M Doppelsieb-Blattbildner
FI112509B (fi) * 1994-06-15 2003-12-15 Metso Paper Inc Paperikoneen kitaformeri
DE19652485A1 (de) * 1996-12-17 1998-06-18 Voith Sulzer Papiermasch Gmbh Siebpartie und Verfahren zum Entwässern einer Faserstoffbahn in einer Siebpartie

Also Published As

Publication number Publication date
DE19828237A1 (de) 1999-12-30
ATE230454T1 (de) 2003-01-15
DE59903896D1 (de) 2003-02-06
EP0967323A3 (fr) 2000-01-05
EP0967323A2 (fr) 1999-12-29
US6254727B1 (en) 2001-07-03

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