EP1586702B1 - Section de formage à deux toiles pour machine de fabrication d'une bande de matériau fibreux - Google Patents

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

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Publication number
EP1586702B1
EP1586702B1 EP05102625A EP05102625A EP1586702B1 EP 1586702 B1 EP1586702 B1 EP 1586702B1 EP 05102625 A EP05102625 A EP 05102625A EP 05102625 A EP05102625 A EP 05102625A EP 1586702 B1 EP1586702 B1 EP 1586702B1
Authority
EP
European Patent Office
Prior art keywords
wire
twin
former
wire former
running direction
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.)
Not-in-force
Application number
EP05102625A
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German (de)
English (en)
Other versions
EP1586702A1 (fr
Inventor
Volker Schmidt-Rohr
Wilfried Weiss
Stefan Löhr
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
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Voith Patent GmbH
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Publication date
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Publication of EP1586702A1 publication Critical patent/EP1586702A1/fr
Application granted granted Critical
Publication of EP1586702B1 publication Critical patent/EP1586702B1/fr
Not-in-force legal-status Critical Current
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    • 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, according to the preamble of claim 1.
  • the drainage of the introduced pulp suspension begins on a box equipped with ceramic strips, over the curved surface of which the two screens converge and the first dewatering takes place.
  • the box may, depending on the embodiment, be designed to be open or closed to the environment. In a closed box, the use of vacuum is possible. It may also be individual ceramic strips, which are preferably mounted on support ribs.
  • foil grooves have been incorporated into individual ceramic strips on open boxes having individual ceramic strips, which are intended to suck the entrained air through the foil vacuum created in operation.
  • Such an embodiment is for example from the German patent application DE 100 84 722 T1 known.
  • the embodiment has a plurality of grooves formed in the central part, the grooves running along the front width to a discharge opening in the rear part.
  • the box bottom has a - seen in the vertical direction - highest point by a vertical height in the range of 10 to 700 mm, preferably from 100 to 400 mm, above the beginning of the first free drainage opening in the wire direction is located, and that the impingement shoe by means of at least one vacuum source with a vacuum ⁇ 0.5 kPa, preferably ⁇ 2 kPa, in particular ⁇ 5 kPa, is regulary / controllable sucked.
  • This solution allows the operation of the twin-wire former even at high wire speeds ⁇ 1,500 m / min, preferably ⁇ 1,700 m / min, and at low basis weights, without water streaks and / or bright spots occur in the fibrous web produced.
  • twin-wire former according to the invention can also be used in conversions of existing systems, such as in the case of conversions of BelBaie-formers.
  • the strips preferably have run-off-side scraping edges, wherein the second strip in the wire direction and the subsequent strip thereof has a respective guide surface whose geometrically linear extension does not touch the bottom of the box on the inside. This ensures that the white water discharged from the scraping edges is thrown freely over the highest point of the box bottom and in turn the emergence of an open water sump is completely avoided.
  • the strips In order to ensure adequate guidance and stabilization of the twin-wire section in the area of the impingement shoe, the strips have a width ⁇ 150 mm, preferably ⁇ 100 mm, in particular ⁇ 60 mm.
  • the impingement shoe should or must have a strong curvature, that exert a high pressure on the pulp suspension in order to squeeze out the entrained air on the opposite side by means of the wire tension from the pulp suspension.
  • the impingement shoe preferably has at least one, preferably two or more curved regions, preferably with different lengths, whose radii each have a greater value in the wire direction.
  • the radius of the first region preferably has a value in the range from 0.6 to 4 m, preferably from 1 to 2 m, and the radius of the second region preferably has a value in the range from 2 to 5 m, preferably 3 m, whereas the length of the The first region preferably has a value in the range of 15 to 150 mm, preferably 70 to 120 mm, and the length of the second region preferably has a value in the range of 90 to 250 mm. These dimensions are particularly advantageous at high speeds.
  • FIG. 1 shows a schematic partial side view of a twin wire former 1 according to the known prior art.
  • the drainage of the introduced pulp suspension 13 begins on a box 17 equipped with ceramic strips 17.1 to 17.4 box 18, on the curved surface 19, the two wires 3, 4 converge and the first dewatering takes place.
  • the box 18 has at the outset a casserole 20 for the protection of the beam after the impact points 14 3 , 14 4 .
  • the box 18 may, depending on the embodiment, open or close to the environment, as in FIG FIG. 1 shown executed. In a closed box 18, the application of vacuum possible. It may also be in unillustrated embodiment also to individual ceramic strips, which are preferably mounted on support ribs.
  • FIG. 2 shows a further schematic partial side view of a twin wire former 1 according to the known prior art.
  • FIG. 2 Although illustrated embodiment works without sump, but the air-white water mixture is dissipated insufficiently in the initial drainage area.
  • the wide ceramic strips block the occurrence of air and white water from the pulp suspension over a considerable distance in the initial drainage area.
  • the air discharge is not efficient in the non-blocked, ie open, sections.
  • the foil grooves 24 of the ceramic strips 23 may become more or less quickly and heavily contaminated even under normal operating conditions. The production of bright spots in the produced material web 2 is favored by this design as a rule.
  • FIG. 3 now shows a schematic partial side view of an embodiment of the twin-wire former 1 according to the invention.
  • the box bottom 33 has a - seen in the vertical direction - the highest point B, by a vertical height Hv in the range of 10 to 700 mm, preferably from 100 to 400 mm, above the beginning of the S in the direction of filament S (arrow) first free drainage opening 30.1 is located.
  • the strips 29.1 to 29.6 have run-off side scraping edges 34.1 to 34.6, wherein in the direction of wire direction S (arrow) second strip 29.2 and their subsequent strip 29.3 to 29.6 a respective guide surface 35.2 to 35.6, the geometrically linear extension V 29.2 to V 29.6 the box bottom 33 not touched on the inside.
  • the respective guide surface 35.2 to 35.6 is preferably arranged at an angle ⁇ ⁇ 80 °, preferably ⁇ 60 °, to the respective wire direction S (arrow) and the strips 29.1 to 29.6 have a width B 29.1 to B 29.6 (only giving the width B 29.4 ) ⁇ 150 mm, preferably ⁇ 100 mm, in particular ⁇ 60 mm.
  • the open surface 31 of the Impingementschuhs 9.1 also interrupted, machine width and transverse to the wire direction S (arrow) aligned slits, in Sieblaufraum S (arrow) aligned herringbone slots, holes and / or differently shaped openings, in particular breakthroughs, exhibit.
  • the impingement shoe 9.1 has two curved regions B 1 , B 2 , preferably with different lengths L 1 , L 2 , whose radii R 1 , R 2 each have a greater value in the direction of wire run S (arrow).
  • the radius R 1 of the first region B 1 has a value in the range of 0.6 to 4 m, preferably 1 to 2 m
  • the radius R 2 of the second region B 2 has a value in the range of 2 to 5 m, 3 m
  • the length L 1 of the first region B 1 has a value in the range of 15 to 150 mm, preferably 70 to 120 mm
  • the length L 2 of the second region B 2 has a value in the region of 90 up to 250 mm.
  • several areas with these properties may be present.
  • the impingement shoe 9.1 is regularly / controllably evacuated by means of at least one vacuum source not shown in detail but known to the person skilled in the art with a vacuum V ⁇ 0.5 kPa, preferably ⁇ 2 kPa, in particular ⁇ 5 kPa, and on the side opposite the impingement shoe 9.1 the Doppelsiebender 15 a plurality of strips 36 are arranged, which are in a known manner flexible to the adjacent sieve 4 can be pressed.
  • the flexible contact strips 36 are at least partially opposite the free drainage holes 30.1 to 30.5 arranged.
  • the two wires 3, 4 have a respective wire speed v ⁇ 1,500 m / min, preferably ⁇ 1,700 m / min, and the Doppelsiebumble 15 is disposed at an angle ⁇ of 0 ° to 90 ° to the horizontal H.
  • the twin-wire former 1 according to the invention can therefore be designed as a horizontal, vertical or skew former.
  • the invention provides a sheet forming system of a machine for producing a stain-free fibrous web having a very good formation even at high speeds.

Landscapes

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

Claims (13)

  1. Section de formage à deux toiles (1) pour une machine de fabrication d'une bande de matériau fibreux (2), en particulier d'une bande de papier ou de carton, avec deux toiles sans fin (3, 4) défilant en continu, qui circulent toutes les deux sur une zone périphérique (5, 6) d'un élément de déviation respectif (7, 8) sous la forme d'un rouleau de tête (7.1, 8.1), qui circulent ensuite ensemble au moins jusqu'à atteindre un dispositif d'impact (9, 9.1) en formant une fente d'entrée de matière (10), qui reprend immédiatement l'au moins une suspension de matériau fibreux (13) sortant de la caisse de tête (11) sous la forme d'un jet de suspension de matériau fibreux (12) lors de la formation de points d'impact respectifs du jet (143, 144) sur les deux toiles (3, 4), et qui forment ensuite une section à deux toiles (15), dans laquelle les deux toiles (3, 4) et l'au moins une suspension de matériau fibreux (13) disposée entre celles-ci sont guidées sur plusieurs éléments de formage et d'essorage (16), dans laquelle le dispositif d'impact (9) est formé par un sabot d'impact (9.1), qui présente une garniture (28) avec plusieurs lattes (29.1 à 29.6) disposées l'une derrière l'autre dans la direction de circulation des toiles (S) avec des ouvertures d'essorage libres (30.1 à 30.5) disposées entre celles-ci, qui touchent la toile en circulation (3) avec une surface (31.1 à 31.6) respectivement fixe et ouverte, et qui présente un caisson d'enveloppe (32), dont le fond de caisson (33) est placé de façon étanche sur le rouleau de tête (7.1) qui le précède dans la direction de circulation de la toile (S) de telle manière que le fond de caisson (33) soit mené au moins localement autour du rouleau de tête (7.1), caractérisée en ce que le fond de caisson (33) présente un point le plus élevé (B) - vu en direction verticale - qui est situé à une hauteur verticale (Hv) dans la plage de 10 à 700 mm, de préférence de 100 à 400 mm, au-dessus du commencement de la première ouverture d'essorage libre (30.1) dans la direction de circulation des toiles (S) et en ce que le sabot d'impact (9.1) est mis en dépression de façon réglable ou commandable au moyen d'au moins une source de vide, à un vide (V) ≥ 0,5 kPa, de préférence ≥ 2 kPa, en particulier ≥ 5 kPa.
  2. Section de formage à deux toiles (1) selon la revendication 1, caractérisée en ce que les lattes (29.1 à 29.6) présentent des arêtes de raclage (34.1 à 34.6) côté tête, dans laquelle la deuxième latte et la latte suivante dans la direction de circulation des toiles (S) présentent une surface de guidage respective (35.2 à 35.6), dont le prolongement géométriquement linéaire (V29.2 à V29.6) ne touche pas le fond de caisson (33) du côté intérieur.
  3. Section de formage à deux toiles (1) selon la revendication 2, caractérisée en ce que la surface de guidage respective (35.2 à 35.6) est disposée sous un angle (α) ≤ 80°, de préférence ≤ 60°, par rapport à la direction respective de circulation des toiles (S).
  4. Section de formage à deux toiles (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que les lattes (29.1 à 29.6) présentent une largeur (B29.1 à B29.6) ≤ 150 mm, de préférence ≤ 100 mm, en particulier 8 ≤ 60 mm.
  5. Section de formage à deux toiles (1) selon la revendication 1, caractérisée en ce que la surface ouverte (31) du sabot d'impact (9.1) présente en plus des fentes interrompues, de la largeur de la machine et orientées transversalement à la direction de circulation des toiles (S), des fentes en écailles de poisson orientées dans la direction de circulation des toiles (S), des perçages et/ou des ouvertures présentant d'autres formes.
  6. Section de formage à deux toiles (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le sabot d'impact (9.1) présente au moins une, de préférence deux ou plusieurs zones courbes (B1, B2) ayant des longueurs de préférence différentes (L1, L2) , dont les rayons (R1, R2) présentent respectivement une valeur plus grande dans la direction de circulation des toiles (S).
  7. Section de formage à deux toiles (1) selon la revendication 6, caractérisée en ce que le rayon (R1) de la première zone (B1) présente une valeur dans la plage de 0,6 à 4 m, de préférence de 1 à 2 m, et le rayon (R2) de la deuxième zone (B2) présente une valeur dans la plage de 2 à 5 m, de préférence de 3 m.
  8. Section de formage à deux toiles (1) selon la revendication 6 ou 7, caractérisée en ce que la longueur (L1) de la première zone (B1) présente une valeur dans la plage de 15 à 150 mm, de préférence de 70 à 120 mm, et la longueur (L2) de la deuxième zone (B2) présente une valeur dans la plage de 90 à 250 mm.
  9. Section de formage à deux toiles (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que les ouvertures d'essorage libres (30.1 à 30.5) présentent des grandeurs différentes, dont la valeur diminue de préférence dans la direction de circulation des toiles (S).
  10. Section de formage à deux toiles (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que plusieurs lattes (36), qui peuvent être pressées de manière flexible sur la toile appliquée (4), sont disposées sur le côté de la section à deux toiles (15) situé en face du sabot d'impact (9.1).
  11. Section de formage à deux toiles (1) selon la revendication 10, caractérisée en ce que les lattes (36) pouvant être pressées de manière flexible sont disposées au moins en partie en face des ouvertures d'essorage libres (30.1 à 30.5).
  12. Section de formage à deux toiles (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que les deux toiles (3, 4) présentent une vitesse de toile respective (v) ≥ 1500 m/min, de préférence ≥ 1700 m/min.
  13. Section de formage à deux toiles (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que la section à deux toiles (15) est disposée sous un angle (β) de 0° à 90° par rapport à l'horizontale (H).
EP05102625A 2004-04-13 2005-04-04 Section de formage à deux toiles pour machine de fabrication d'une bande de matériau fibreux Not-in-force EP1586702B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004018329 2004-04-13
DE102004018329A DE102004018329A1 (de) 2004-04-13 2004-04-13 Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP1586702A1 EP1586702A1 (fr) 2005-10-19
EP1586702B1 true EP1586702B1 (fr) 2009-07-01

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EP05102625A Not-in-force EP1586702B1 (fr) 2004-04-13 2005-04-04 Section de formage à deux toiles pour machine de fabrication d'une bande de matériau fibreux

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EP (1) EP1586702B1 (fr)
AT (1) ATE435331T1 (fr)
DE (2) DE102004018329A1 (fr)

Families Citing this family (2)

* 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
DE102010003320A1 (de) 2010-03-26 2011-09-29 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4141607C2 (de) * 1991-12-17 1996-04-25 Voith Gmbh J M Doppelsiebformer
DE4208681A1 (de) * 1992-03-18 1993-09-23 Escher Wyss Gmbh Nassteil einer doppelsieb-papiermaschine
DE19803451A1 (de) * 1998-01-30 1999-08-05 Voith Sulzer Papiertech Patent Naßpartie und Verfahren zum Herstellen einer Faserstoffbahn
US6372091B2 (en) * 1999-06-18 2002-04-16 Metso Paper, Inc. Method and apparatus for forming a paper web

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DE102004018329A1 (de) 2005-11-10
DE502005007600D1 (de) 2009-08-13
ATE435331T1 (de) 2009-07-15
EP1586702A1 (fr) 2005-10-19

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