EP1489229B1 - Section de formage à deux toiles d'une machine de fabrication d'une bande de matériau fibreux - Google Patents

Section de formage à deux toiles d'une machine de fabrication d'une bande de matériau fibreux Download PDF

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Publication number
EP1489229B1
EP1489229B1 EP04102747A EP04102747A EP1489229B1 EP 1489229 B1 EP1489229 B1 EP 1489229B1 EP 04102747 A EP04102747 A EP 04102747A EP 04102747 A EP04102747 A EP 04102747A EP 1489229 B1 EP1489229 B1 EP 1489229B1
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EP
European Patent Office
Prior art keywords
forming
wire
twin
wire former
former
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
EP04102747A
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German (de)
English (en)
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EP1489229A1 (fr
Inventor
Johann Moser
Joachim Dr. Grabscheid
Helmut Heinzmann
Otmar Kolb
Volker Schmidt-Rohr
Thomas Dr. Jaschinski
Wolfgang Ruf
Peter Mirsberger
Philipp Buchhold
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
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Publication of EP1489229A1 publication Critical patent/EP1489229A1/fr
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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 of a machine for producing a fibrous web, in particular a paper or board web, from at least one pulp suspension, with two continuous endless screens, of which the first wire runs over a peripheral region of a forming roll and the second wire over a peripheral region of a breast roll
  • the two sieves then converge in the area of the forming roller to form a wedge-shaped material inlet gap, which receives the pulp suspension directly from a headbox, and subsequently form a twin-wire section, which is arranged at least one downstream of the forming wire in the wire loop direction.
  • Having a plurality of negative pressure zones at least partially acted upon by negative pressure and comprising a plurality of forming elements forming unit having a curved working surface.
  • twin-wire former is for example from the PCT application WO 99/60205 A1 known.
  • the published patent application DE-OS 22 14 279 and the PCT application WO 95/34713 A1 in each case a twin-wire former of a machine for producing a paper web from at least one pulp suspension, with two continuous endless screens, of which the first wire runs over a peripheral region of a forming roller and the second wire runs over a peripheral region of a breast roll and the two sieves thereafter to form a wedge-shaped Stoffeinlaufspalts that receives the pulp suspension directly from a headbox, converge in the field of Formierwalze and then form a Doppelsiebnote, the at least one of the forming roller Having in downstream direction of the wire, at least partially subjected to negative pressure and comprising a plurality of forming elements forming unit having a curved working surface.
  • the multi-zone forming unit is arranged downstream of the forming roller at its wire discharge point of the two wires of the same in the wire-running direction at a distance which assumes a value in the range of 0 to 70 mm.
  • a twin-wire former disclosed in the three documents cited is referred to in the art as a scroll blade gap former.
  • a large amount of water is dewatered on the forming roller, which is thrown off after the Siebablauf of the forming roller from the roll shell.
  • This results in disadvantageous manner by the Registerwalzen consequently, the formation disturbances and stripes in the produced fibrous web, in particular paper or board web, can produce.
  • dewatering on the forming roll may be too intense for some varieties.
  • the invention is therefore an object of the invention to provide an improved twin-wire former of the type mentioned above, which avoids the disadvantages and problems of known twin-wire former and also slows down the dewatering of the fibrous web while avoiding the known sensitivity of the blotter former Blatterer and designed gentler.
  • this object is achieved in a twin-wire former according to the type mentioned above in that the forming unit of the forming roller is arranged at its Siebablauftician of at least one sieve of the same directly downstream in the wire direction at a distance and that the distance between the Siebablauftician and the first forming element of the forming unit a value in the range of 50 to 150 mm, preferably from 80 to 110 mm, assumes. In this case, of course, both screens run off at a common Siebablauftician of the forming roller.
  • the point of impact of the headbox jet is selected so that can be sufficiently dewatered in the downstream forming unit.
  • the amount of dewatering on the forming roll should be less than 60%, preferably less than 40%, in particular less than 30%, of the amount of water fed to the twin-wire former through the pulp suspension. This is for example the case when the Siebablauftician the screen from the forming roller and the point of impact of the pulp suspension on the screen have a distance which assumes a value in the range of 0 to 50 mm, preferably from 20 to 30 mm.
  • the twin-wire former can also be operated as a bladeformer without bright spots. This leads to better formation and flatness and a lower susceptibility to transverse profile disturbances in the fibrous web to be produced.
  • the material jet impinges on or after the Siebablauftician, for example in the region of the first bar of the first forming element.
  • the forming roller has a plurality, preferably two, from the beginning of the twin-wire section to at least its apex extending and preferably individually adjustable suction zones and if the last suction zone a Sealing strip which lies under a the circumferential surface of the forming roller beschabenden Abdichtschaber.
  • This embodiment also ensures optimal efficiency of the suction of the forming roller
  • At least the first vacuum zone of the forming unit is preferably also open both to the forming roller and sealed to the environment, wherein in particular the first vacuum zone of the forming unit is designed as a preferably individually adjustable vacuum zone.
  • This first vacuum zone of the forming unit can advantageously also evacuate the at least one suction zone of the forming roller located downstream of the first suction zone.
  • the vacuum zone of the forming unit following the first vacuum zone can also be designed as preferably individually adjustable vacuum zones. This type of aspiration supports and ensures the previously mentioned improved, gentle and effective dewatering of the fibrous web to be produced.
  • the area between the sieve discharge point and the first forming element is selectively and individually adjustable with negative pressure in the range from 0.01 to 0.15 bar, preferably from 0.01 to 0.05 bar.
  • the first forming element has a lower wall directed towards the forming roller.
  • a channel between the forming roller and the first forming element is formed, which assumes a preferably constant channel height in the range of 1 to 35 mm, preferably from 5 to 10 mm.
  • a reinforcement of the negative pressure of the fibrous web to be produced results according to the further embodiment, that the further forming elements of the first vacuum zone of the forming unit are provided on the outlet side with guide elements directed towards the forming roller, in particular guide plates. Moreover, the white water emerging on the fibrous web to be produced is discharged reliably and favorably via the vertex of the forming roller through these directional guide elements.
  • this is provided with a curved working surface with openings of any shape, preferably with holes or machine-width slots.
  • the holes can be arranged arbitrarily or according to a pattern and have the same or different diameters.
  • the machine width slots may have the same or different sizes and / or spacings.
  • further elements for improving the formation on the opposite side of the twin-wire section are arranged between the forming elements of the forming unit arranged in the direction of wire flow.
  • an element for improving the formation is arranged on the opposite side of the twin-wire section.
  • the single element for improving the formation is a preferably sectionally adjustable forming strip or an element for generating a pressure pulse, but also other types of elements are possible.
  • the forming unit are followed by further forming and dewatering units in the direction of the wire feed.
  • At least one dewatering unit can be designed, for example, as a suction element, which can preferably be set to adjust the blade symmetry to the second screen.
  • FIG. 1 illustrated twin-wire former 1 of a machine for producing a fibrous web 2, in particular a paper or board web, at least a pulp suspension 3 comprises two continuous endless screens 4, 5, of which the first wire 4 runs over a peripheral region 7 of a forming roller 6 and the second wire 5 runs over a peripheral region 9 of a breast roll 8 and the two wires 4, 5 thereafter under formation a wedge-shaped Stoffeinlaufspalts 10 which receives the pulp suspension 3 directly from a headbox 11, converge in the region or preferably immediately after the forming roller 6 and then form a Doppelsiebnote 12, the at least one of the forming roller 6 in the wire direction S (arrow) downstream, at least partially with Having vacuum applied and a plurality of forming elements 15 comprehensive forming unit 13 with curved working surface 14.
  • the forming roller 6 in this case has a more than the skilled person known design.
  • the twin-wire section 12 extends in the embodiment vertically or approximately vertically upwards; However, in a further embodiment, it can also extend obliquely to the horizontal up or down or it can be horizontal or approximately horizontal.
  • the forming unit 13 thus protrudes into the drain pocket 18 formed by the forming roller 6 and the breast roll 8.
  • the forming roller 6 has a plurality, preferably two, from the beginning of the twin-wire section 12 to at least its apex 19 extending and preferably individually adjustable suction zones 20.1, 20.2 and the last suction zone 20.2 has a sealing strip 21 which under a peripheral surface 22 of the forming roller 6 shinging sealing scraper 23 is located.
  • At least the first vacuum zone 16.1 of the forming unit 13 is open both to the forming roller 6 and sealed to the environment and it is designed as preferably individually adjustable vacuum zone. It extends according to the drawing over the upper region of the forming roller 6 and it is acted upon by at least one negative pressure device 24 of known type. Furthermore, the vacuum zones 16.2 of the forming unit 13 following the first vacuum zone 16.1 are also designed as preferably individually adjustable vacuum zones and are acted upon by at least one respective vacuum device 24 of known design.
  • the area between the Siebablauftician 17 and the first forming element 15.1 is subjected to negative pressure in the range of 0.01 to 0.15 bar, preferably from 0.01 to 0.05 bar.
  • the first forming element 15.1 has a bottom wall 25 directed towards the forming roller 6, so that a channel 26 is formed between the forming roller 6 and the first forming element 15.1, which has a preferably constant channel height H in the range from 1 to 35 mm, preferably from 5 to 10 mm, assumes.
  • the first suction zone 20.1 of the forming roller 6 extends in the region of the channel 26.
  • the further forming elements 15.2, 15.3 of the first vacuum zone 16.1 of the forming unit 13 are provided on the outlet side with guide elements 27 directed towards the forming roller 6, in particular baffles.
  • the guide elements 27 can assume different contours depending on the position and function.
  • the guide elements 27 may also be arranged in the free space of the first vacuum zone 16.1 and preferably in front of the vertex 19.
  • the curved working surface 14 of the forming unit 13 is provided with openings 28 of any shape, preferably with holes or machine-wide slots.
  • a Foilwellenschliff and a Foilrille are well known to those skilled, for example from the unpublished German patent application DE 103 74 27.8 from 18.06.2003, and therefore not shown in detail.
  • an element 29 for formation improvement is arranged on the opposite side of the twin-wire section 12.
  • the element 29 for improving the formation is a preferably sectionally adjustable forming strip or an element for generating a pressure pulse.
  • the forming unit 13 are arranged in the direction of wire direction S (arrow) further forming and drainage units 30 of known type in many possible arrangements.
  • At least one dewatering unit 30 can be designed, for example, as a suction element, which can preferably be set to adjust the sheet symmetry to the second wire 5.
  • FIG. 2 shows a detailed view of the wedge-shaped Stoffeinlaufspalts 10 of the twin-wire former 1 according to the invention.
  • the twin-wire former 1 comprises two continuous endless screens 4, 5, of which the first wire 4 runs over a peripheral region 7 of a forming roller 6 and the second wire 5 runs over a peripheral region 9 of a breast roll 8 and the two wires 4, 5 Thereafter, to form a wedge-shaped material inlet gap 10, which receives the pulp suspension 3 directly from a headbox, not shown, converge in the region or preferably immediately after the forming roller 6 and then a twin-wire section 12 form. In the embodiment of FIG. 2 they run together after the Siebablauftician 17 of the screen 4 of the forming roller 6.
  • the distance B between the Siebablauftician 17 of the screen 4 from the forming roller 6 and the impact point 31 of the pulp suspension 3 on the screen 4 has a value in the range of 0 to 50 mm, preferably from 20 to 30 mm, assumes.
  • the impact point 32 of the pulp suspension 3 on the wire 5 is preferably in the region of the impact point 31; However, it can also be in the area of breast roll 8.
  • the invention provides an improved twin-wire former of the type mentioned above, which avoids the disadvantages and problems of known twin-wire former and, moreover, slows down and dehydrates the dewatering of the fibrous web while avoiding the known stain sensitivity of the blade former.

Landscapes

  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (17)

  1. Section de formage à double toile (1) d'une machine de fabrication d'une bande fibreuse (2), en particulier d'une bande de papier ou de carton, constituée d'au moins une suspension fibreuse (3), comprenant deux toiles sans fin en mouvement (4, 5), dont la première toile (4) passe sur une région périphérique (7) d'un rouleau de formage (6) et la deuxième toile (5) passe sur une région périphérique (9) d'un rouleau de tête (8), les deux toiles (4, 5) se réunissant ensuite dans la région du rouleau de formage (6) en formant une fente d'entrée de matière (10) en forme de coin, qui reçoit directement la suspension fibreuse (3) depuis une caisse de tête (11), puis formant ensuite une section à double toile (12) qui présente au moins une unité de formage (13) de surface de travail courbe (14) disposée dans la boucle de toile de la première toile (4), placée après le rouleau de formage (6) dans le sens d'avance des toiles (S), présentant plusieurs zones de dépression (16.1, 16.2), sollicitée au moins en partie par une dépression et comprenant plusieurs éléments de formage (15),
    caractérisée en ce que
    l'unité de formage (13) est placée, dans le sens d'avance des toiles (S), directement après le rouleau de formage (6) au niveau de son point de sortie de toile (17) des deux toiles (4, 5), et
    en ce que la distance (A) entre le point de sortie de toile (17) et le premier élément de formage (15.1) de l'unité de formage (13) est comprise entre 50 mm et 150 mm, de préférence entre 80 mm et 110 mm.
  2. Section de formage à double toile (1) selon la revendication 1,
    caractérisée en ce que
    le point de sortie de toile (17) de la toile (4) depuis le rouleau de formage (6) et le point d'incidence (31) de la suspension fibreuse (3) sur la toile (4) sont à une distance (B) qui est comprise entre 0 et 50 mm, de préférence entre 20 et 30 mm.
  3. Section de formage à double toile (1) selon la revendication 1 ou 2,
    caractérisée en ce que
    le rouleau de formage (6) présente plusieurs, de préférence deux, zones d'aspiration (20.1, 20.2) s'étendant depuis le début de la section à double toile (12) jusqu'à au moins leur sommet (19), et pouvant de préférence être ajustées individuellement, et
    en ce que la dernière zone d'aspiration (20.2) présente une nervure d'étanchéité (21) qui se situe sous un racloir d'étanchéité (23) raclant la surface périphérique (22) du rouleau de formage (6).
  4. Section de formage à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    au moins la première zone de dépression (16.1) de l'unité de formage (13) est ouverte vers le rouleau de formage (6) et est également rendue étanche vis-à-vis de l'environnement.
  5. Section de formage à double toile (1) selon la revendication 4,
    caractérisée en ce que
    la première zone de dépression (16.1) de l'unité de formage (13) est réalisée sous forme de zone de dépression ajustable de préférence individuellement.
  6. Section de formage à double toile (1) selon la revendication 4 ou 5,
    caractérisée en ce que
    les zones de dépression (16.2) de l'unité de formage (13) suivant la première zone de dépression (16.1) sont réalisées sous forme de zones de dépression ajustables de préférence individuellement.
  7. Section de formage à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la région entre le point de sortie de toile (17) et le premier élément de formage (15.1) est sollicitée par une dépression comprise entre 0,01 et 0,15 bar, de préférence entre 0,01 et 0,05 bar.
  8. Section de formage à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le premier élément de formage (15.1) présente une paroi inférieure (25) orientée vers le rouleau de formage (6), et en ce qu'un canal (26) est ainsi formé entre le rouleau de formage (6) et le premier élément de formage (15.1), qui présente une hauteur de canal de préférence constante (H), comprise entre 1 et 35 mm, de préférence entre 5 et 10 mm.
  9. Section de formage à double toile (1) selon la revendication 8,
    caractérisée en ce que
    la première zone d'aspiration du rouleau de formage (6) s'étend dans la région du canal (26).
  10. Section de formage à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    les autres éléments de formage (15.2, 15.3) de la première zone de dépression (16.1) de l'unité de formage (13) sont pourvus du côté de la sortie d'éléments conducteurs (27) orientés vers le rouleau de formage (6), en particulier de tôles déflectrices.
  11. Section de formage à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la surface de travail courbe (14) de l'unité de formage (13) est pourvue d'ouvertures (28) de forme quelconque, de préférence d'alésages ou de fentes de la largeur de la machine.
  12. Section de formage à double toile (1) selon la revendication 11,
    caractérisée en ce que
    la première surface de travail courbe (14) de l'unité de formage (13) non pourvue d'ouvertures (28) est pourvue d'un profil ondulé en feuille et/ou de gorges en feuille s'étendant suivant un angle de 2 à 15°, de préférence de 5 à 10° par rapport au sens d'avance des toiles (S).
  13. Section de formage à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    d'autres éléments (29) pour améliorer la formation sont disposés du côté opposé de la section à double toile (12), entre les éléments de formage (15.1, 15.2, 15.3) de l'unité de formage (13), disposés à distance respective dans le sens d'avance des toiles (S).
  14. Section de formage à double toile (1) selon la revendication 13,
    caractérisée en ce
    qu'un élément (29) pour améliorer la formation est disposé du côté opposé de la section à double toile (12) après le premier élément de formage (15.1) de l'unité de formage (13).
  15. Section de formage à double toile (1) selon la revendication 13 ou 14,
    caractérisée en ce que
    l'élément (29) pour améliorer la formation est une nervure de formage de préférence applicable par section ou un élément pour produire une impulsion de pression.
  16. Section de formage à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    l'unité de formage (13) est suivie dans le sens d'avance des toiles (S) par d'autres unités de formage et d'égouttage (30).
  17. Section de formage à double toile (1) selon la revendication 16,
    caractérisée en ce
    qu'au moins une unité d'égouttage (30) est réalisée sous forme d'élément aspirant, qui peut être appliqué contre la deuxième toile (5) pour ajuster la symétrie des feuilles.
EP04102747A 2003-06-18 2004-06-16 Section de formage à deux toiles d'une machine de fabrication d'une bande de matériau fibreux Expired - Lifetime EP1489229B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10327425 2003-06-18
DE10327425A DE10327425A1 (de) 2003-06-18 2003-06-18 Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP1489229A1 EP1489229A1 (fr) 2004-12-22
EP1489229B1 true EP1489229B1 (fr) 2008-02-27

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Application Number Title Priority Date Filing Date
EP04102747A Expired - Lifetime EP1489229B1 (fr) 2003-06-18 2004-06-16 Section de formage à deux toiles d'une machine de fabrication d'une bande de matériau fibreux

Country Status (3)

Country Link
EP (1) EP1489229B1 (fr)
AT (1) ATE387540T1 (fr)
DE (2) DE10327425A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040948A1 (de) 2008-08-01 2010-02-04 Voith Patent Gmbh Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA960496A (en) * 1971-03-25 1975-01-07 Beloit Corporation Vertical twin wire web forming arrangement
DE3123131C2 (de) * 1981-06-11 1986-01-09 J.M. Voith Gmbh, 7920 Heidenheim Entwässerungswalze mit Wasserabführungselement für ein Papiermaschinen-Siebband
DE3513320A1 (de) * 1985-04-13 1986-10-23 Feldmühle AG, 4000 Düsseldorf Streichleiste fuer eine papiermaschine
US5225043A (en) * 1989-04-04 1993-07-06 Sulzer-Escher Wyss Gmbh Twin wire former with water guide element over the forming zone
DE4332162C2 (de) * 1993-09-22 1994-12-01 Voith Gmbh J M Doppelsiebformer einer Papiermaschine
FI112509B (fi) * 1994-06-15 2003-12-15 Metso Paper Inc Paperikoneen kitaformeri
DE19632509A1 (de) * 1996-08-13 1998-03-05 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zum Herstellen einer Faserstoffbahn
FI981098A (fi) * 1998-05-18 1999-11-19 Valmet Corp Paperikoneen kaksiviirainen tela-kiraformeri
DE10106731A1 (de) * 2001-02-14 2002-08-22 Voith Paper Patent Gmbh Doppelsiebformer zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension

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Publication number Publication date
EP1489229A1 (fr) 2004-12-22
DE502004006298D1 (de) 2008-04-10
ATE387540T1 (de) 2008-03-15
DE10327425A1 (de) 2005-01-05

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