EP0576798B1 - Section de formage à deux toiles - Google Patents

Section de formage à deux toiles Download PDF

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Publication number
EP0576798B1
EP0576798B1 EP93106775A EP93106775A EP0576798B1 EP 0576798 B1 EP0576798 B1 EP 0576798B1 EP 93106775 A EP93106775 A EP 93106775A EP 93106775 A EP93106775 A EP 93106775A EP 0576798 B1 EP0576798 B1 EP 0576798B1
Authority
EP
European Patent Office
Prior art keywords
wire
guide surface
twin
former according
wire 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
EP93106775A
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German (de)
English (en)
Other versions
EP0576798A1 (fr
EP0576798B2 (fr
Inventor
Alfred Dr. Bubik
Hans Dr. Dahl
Josef Dom
Karl Müller
Heinz Steckenreuter
Elmer Dr. Weisshuhn
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
Voith Sulzer Papiermaschinen GmbH
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Filing date
Publication date
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Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0576798A1 publication Critical patent/EP0576798A1/fr
Publication of EP0576798B1 publication Critical patent/EP0576798B1/fr
Application granted granted Critical
Publication of EP0576798B2 publication Critical patent/EP0576798B2/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 according to the preamble of claim 1 (US-A-4 648 943).
  • Such a twin wire former is part of a paper machine and essentially serves to dewater a fibrous suspension which is spread out on a permeable screen surface and is intended for paper production, and to distribute or arrange the constituents contained in the suspension in the desired form.
  • This section of paper production is usually referred to as sheet formation, web formation or formation. This is where the quality of the paper produced later is decided.
  • US-A-4,648,943 shows the part of a twin-wire former with two screens in which a curved formation shoe follows after these two screens have converged. As shown, this has a closed surface towards the lower sieve. The description explains that it is also conceivable that a finished paper web is already on the lower wire before this forming shoe is reached.
  • the crucial goal of this twin wire former is, however, that this shoe is moved by a vibration mechanism that is only shown in general terms. This movement takes place when the shoe rotates around a fixed point in front. This torsional vibration is said to have beneficial effects on formation and drainage.
  • the invention has for its object to provide a twin wire former with which the formation is very evenly possible and can be adjusted over a wide range.
  • the outlay on equipment should be kept as low as possible.
  • the guide surface for the first screen is not positioned rigidly, but rather by a force directed essentially against the screen, i.e. non-positively pressed against the bottom wire loop, the force thus applied essentially supporting the wire tension of the first wire, partly that of the second wire and the weight forces.
  • damping of oscillating sieve forces is also possible.
  • the advantage of the invention is particularly evident when other sieve-guiding parts are rigidly positioned in the immediate vicinity of the non-positively guided guide surface.
  • the shoe can dodge on the sieve even when the suspension height is approximately uneven ("soft nip entrance"). All of this results in a soft formation, as is particularly sought after in writing and printing paper. However, other types of paper also require good sheet uniformity.
  • the twin wire former can be optimally matched to the desired paper quality.
  • the fixed curvature, on the one hand, and the force-controlled change in position, on the other hand, result in smooth transitions when guiding the sieve in the former, which is also important when the direction of curvature is reversed.
  • the drainage can be improved by minimal shear movements without causing damage to the path.
  • the guide surface located in the second sieve has the opposite direction of curvature.
  • the water still contained can be directed particularly effectively into a suction roller or a suction box by suction support.
  • the suction box can contain a suction gap located at the front, viewed in the running direction, which extends into the area of the curved guide surface located in the first sieve and thus into the area before the direction of curvature is reversed.
  • a suction box can be permanently mounted in the second wire, it does not have to be adjustable during operation of the system, or a permanently installed suction roller can also be provided.
  • the self-sufficient according to the screen tension and the set support force for the guide surface lying in the first screen will be sufficient to position the elements of the twin wire former in the desired manner relative to one another without changing the position of further guide surfaces.
  • another rigidly positioned drainage device is also conceivable in front of the yielding guide surface.
  • Fig. 1 shows schematically an embodiment of the twin wire former according to the invention.
  • a moving endless first sieve 1, here first designed as a fourdrinier sieve is provided with a suspension layer 3 via a headbox 5, which then releases a part of the water contained through the first sieve 1, which leads the suspension layer 3 lying thereon to the subsequent sheet formation area which lies on a curved guide surface 4 above a sieve table 12.
  • the sieve table 12 is supported both at the front and at the rear, in the running direction of the sieves, by force elements 9 and is movable against the sieves (double arrows).
  • the second screen 2 is fed as a top screen in the sheet formation area mentioned approximately tangentially to the suspension layer 3 located on the first screen 1, whereby from this contact line it essentially approximates the shape of the first screen.
  • the suction box 6 installed in the second sieve discharges water upwards through the second sieve 2. (The water is indicated by arrows in this figure.) It is essentially arranged behind the sheet formation area 5, but can at least partially also exert its effect in the sheet formation area. Due to the fact that the guide surface 7 of the suction box 6 facing the second sieve has a different curvature than in the sheet formation area, a reversal of the curvature takes place, as seen in the running direction of the twin sieve.
  • the strips 13 are arranged and shaped on the sieve table 12 so that the entirety of their surfaces facing the first sieve 1 forms a convex contour.
  • the surface of the individual strips itself is also expediently provided with a radius of curvature which corresponds approximately to the radius of curvature of the guide surface 4.
  • Deformable packing elements are shown as force elements 9, which can be filled with a pressure medium. In this way, a force in generate these elements, which is largely independent of the position of the sieve table 12 in the intended operating range.
  • the pressure is applied in a pressure vessel 15 connected by lines to the pressure vessel 15 serving as force elements 9.
  • This arrangement is also able to dampen oscillations by hydraulic line resistance.
  • the packing can also be loaded with different pressures.
  • the part of the twin wire former shown can also be designed as a suction box, which means that the water is sucked down between the strips 13.
  • FIG. 1 shows the example of a hybrid former
  • FIG. 2 shows a so-called gap former.
  • the wire section is omitted and the headbox 5 'guides the suspension directly as a wide jet into the area of the screen combination.
  • the curved guide surface 4 is produced here by a plate 13 'instead of strips, and the force elements 9 were also designed as springs.
  • these shapes are not tied to the existence of a hybrid former, but must be selected from different points of view. This also applies to the following figures.
  • the sheet formation area can be designed differently.
  • E.g. 4 shows a number of strips which are rigidly connected to one another in groups, each group again having force elements 9, both initially and at the end in the direction of wire travel.
  • a unit provided with two strips 16, which is mounted in a fixed position can guide the first screen and can cause the web to be dewatered.
  • strips 16 ' which are resiliently pressed against the sieve 1 (FIG. 5).
  • Fig. 6 shows a further variant, namely pressure bars, which are partially below one another rigidly connected and each with its own power elements.
  • the guide surface 7 for the second screen 2 is formed here by a suction roller 17.
  • the twin wire former according to the invention can also be a vertical former.
  • the suspension is injected essentially vertically between the screens 1 and 2 as a wide jet.
  • the guide surface 4 of the first screen 1 is located in the area where the screens are brought together.
  • the water is removed through both screens.
  • the adjoining guide surface 7 can be formed by a suction or forming roll. 8 shows that, in a special case, it can have the same direction of curvature as the preceding guide surface 4.

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  • Paper (AREA)
  • Liquid Crystal Substances (AREA)
  • Organic Insulating Materials (AREA)

Claims (25)

  1. Former à deux toiles avec une première toile (1) et une seconde toile (2), une couche en suspension (3) étant formée sur la première toile (1) qui est guidée avec la couche en suspension (3) dans une zone de formation de feuille formée sur une surface de guidage (4) au moins en partie cintrée dans le sens de passage de la toile, dans lequel en outre la seconde toile (2) est amenée en contact avec la couche en suspension (3) se trouvant sur la première toile (1), et dans lequel sur le côté opposé à la couche en suspension de la seconde toile (2) se trouve une surface de guidage (7) suivante pour la seconde toile (2), à travers laquelle l'eau ayant traversé peut être aspirée, caractérisé en ce que la seconde toile (2), dans la zone de la surface de guidage (4) cintrée pour la première toile (1), est envoyée sur la couche en suspension (3) et en ce que la surface de guidage (4) est déplaçable essentiellement en direction de cette toile et éloignable de celle-ci et est soutenue par force.
  2. Former à deux toiles selon la revendication 1, caractérisé en ce que le déplacement de la surface de guidage (4) en direction de la toile (1) est guidé de manière que son angle ne varie pas par rapport à l'environnement.
  3. Former à deux toiles selon la revendication 1, caractérisé en ce que la surface de guidage (7) pour la deuxième toile (2) est au moins partiellement cintrée et en ce qu'il s'effectue, entre la surface de guidage (4) pour la première toile (1) et la surface de guidage (7) pour la seconde toile (2), une inversion de sens des toiles (1 et 2) réunies avec la couche en suspension (3) guidée entre elles, de sorte que le centre du cintrage de la zone avant l'inversion de sens se situe sur un autre côté du former que le centre du rayon de cintrage après l'inversion de sens.
  4. Former à deux toiles selon la revendication 1, caractérisé en ce que la surface de guidage (4) dans la toile (1) fait partie d'une caisse aspirante déplaçable essentiellement en direction de cette toile et éloignable de celle-ci et soutenue par force.
  5. Former à deux toiles selon la revendication 1 ou 2, caractérisé en ce que le soutien par force de la surface de guidage (4) cintrée pour la première toile (1) s'effectue à l'aide d'éléments de force (9), dont un au moins se trouve au début ainsi qu'à la fin de la surface de guidage (4) cintrée, vue dans le sens de passage de la toile.
  6. Former à deux toiles selon les revendications 1, 2 ou 5, caractérisé en ce que les éléments de force (9) pour le soutien essentiellement par force de la surface de guidage (4) cintrée pour la première toile (1), sont déformables et sont remplis d'un fluide sous pression.
  7. Former à deux toiles selon les revendications 1, 2 ou 5, caractérisé en ce que les éléments de force (9) pour le soutien essentiellement par force de la surface de guidage (4) cintrée pour la première toile (1), sont élastiques.
  8. Former à deux toiles selon la revendication 1, caractérisé en ce que la surface de guidage (4) cintrée pour la première toile (1) est formée par une plaque (13) cintrée, imperméable.
  9. Former à deux toiles selon la revendication 1, caractérisé en ce que la surface de guidage (4) pour la première toile (1) est formée par une plaque (13') pourvue d'ouvertures ou de fentes.
  10. Former à deux toiles selon la revendication 8 ou 9, caractérisé en ce que la surface de guidage (4) pour la première toile (1) est formée par une plaque (13', 11') cintrée, élastique.
  11. Former à deux toiles selon la revendication 1, caractérisé en ce que la surface de guidage (4) pour la première toile (1) est formée par un patin (12) pourvu de baguettes (13) s'étendant sensiblement transversalement au sens de passage.
  12. Former à deux toiles selon la revendication 11, caractérisé en ce que la surface des baguettes (13) présente une courbure qui correspond essentiellement à la courbure d'ensemble de cette surface de guidage (4).
  13. Former à deux toiles selon la revendication 1, caractérisé en ce que la surface de guidage (4) pour la première toile (1) est formée par des baguettes individuelles (13) reliées rigidement entre elles, parmi lesquelles se trouvent des éléments (9) produisant une force.
  14. Former à deux toiles selon la revendication 13, caractérisé en ce que les baguettes individuelles (13) prévues pour produire la surface de guidage (4) cintrée sont reliées rigidement entre elles en groupes, plusieurs de ces groupes étant présents.
  15. Former à deux toiles selon la revendication 1, caractérisé en ce que la surface de guidage (7), se trouvant dans la seconde toile (2), est fixée dans sa position.
  16. Former à deux toiles selon la revendication 1, caractérisé en ce que la surface de guidage (7), se trouvant dans la seconde toile (2), est configurée en caisse aspirante (6), à l'aide de laquelle l'eau ayant traversé peut être évacuée.
  17. Former à deux toiles selon la revendication 16, caractérisé en ce que la surface de guidage (7) de la caisse aspirante (6) est formée par des baguettes s'étendant essentiellement transversalement au sens de passage.
  18. Former à deux toiles selon la revendication 17, caractérisé en ce que la surface des baguettes (13) présente une courbure qui correspond essentiellement à la courbure d'ensemble de cette surface de guidage (7).
  19. Former à deux toiles selon la revendication 1 ou 17, caractérisé en ce qu'une première baguette fermée, vue dans le sens de passage, forme le début de la surface de guidage (7) sur la caisse aspirante (6) et présente une courbure dont le sens de courbure est opposé à celui de la surface de guidage (4) située devant dans la première toile (1).
  20. Former à deux toiles selon les revendications 17 et 19, caractérisé en ce que, vu dans le sens de passage, la première baguette fermée est au moins deux fois aussi longue que les baguettes suivantes.
  21. Former à deux toiles selon la revendication 1, caractérisé en ce que la surface de guidage (7) est formée par un rouleau d'aspiration à l'aide duquel l'eau ayant traversé peut être évacuée.
  22. Former à deux toiles selon la revendication 1, caractérisé en ce que la surface de guidage (7) suivante est formée par un rouleau de formage à l'aide duquel l'eau ayant traversé peut être évacuée.
  23. Former à deux toiles selon la revendication 1, caractérisé en ce qu'une première fente d'aspiration (8), se trouvant dans la deuxième toile (2), opère dans la zone située directement après la réunion des deux toiles (1 et 2).
  24. Former à deux toiles selon la revendication 1, caractérisé en ce que dans la première toile (1) devant la surface de guidage (4) cintrée et séparée de celle-ci se trouve au moins une autre surface de guidage fixe touchant la première toile (1).
  25. Former à deux toiles selon la revendication 1, caractérisé en ce qu'il est prévu des amortisseurs pour l'amortissement des oscillations verticales de la surface de guidage (4) cintrée, mobile verticalement, dans la première toile (1).
EP93106775A 1992-06-12 1993-04-27 Section de formage à deux toiles Expired - Lifetime EP0576798B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4219292 1992-06-12
DE4219292A DE4219292A1 (de) 1992-06-12 1992-06-12 Doppelsiebformer

Publications (3)

Publication Number Publication Date
EP0576798A1 EP0576798A1 (fr) 1994-01-05
EP0576798B1 true EP0576798B1 (fr) 1996-07-17
EP0576798B2 EP0576798B2 (fr) 1999-03-17

Family

ID=6460898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93106775A Expired - Lifetime EP0576798B2 (fr) 1992-06-12 1993-04-27 Section de formage à deux toiles

Country Status (5)

Country Link
US (1) US5635032A (fr)
EP (1) EP0576798B2 (fr)
JP (1) JPH0657682A (fr)
AT (1) ATE140498T1 (fr)
DE (2) DE4219292A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19648850A1 (de) * 1996-11-26 1998-05-28 Voith Sulzer Papiermasch Gmbh Saugvorrichtung und Pressenpartie einer Papiermaschine sowie Verfahren zum Besaugen eines Bahnabschnitts einer Papiermaschine
FI965277A (fi) 1996-12-31 1998-07-01 Valmet Corp Paperikoneen imulaatikko ja menetelmä paperikoneen imulaatikossa
CA2544130C (fr) * 2003-12-22 2008-12-16 Astenjohnson, Inc. Dispositif de formation de type hybride pour machine a fabriquer le papier
WO2006057871A1 (fr) * 2004-11-23 2006-06-01 Astenjohnson, Inc. Machine a papier a formeur double toile a sabot d'incidence a enveloppement variable
CN102203345B (zh) * 2008-10-21 2013-07-17 阿斯顿约翰逊公司 具有多个排水底板的双织物成形部
DE102009027432A1 (de) * 2009-07-02 2011-01-05 Voith Patent Gmbh Formiereinheit und Verfahren zur Herstellung einer Materialbahn
DE102010031169A1 (de) * 2010-07-09 2012-01-12 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer zumindest einschichtigen Faserstoffbahn
DE102015224390A1 (de) * 2015-12-07 2016-12-29 Voith Patent Gmbh Saugkasten innerhalb einer Papiermaschine

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585105A (en) * 1967-05-26 1971-06-15 Beloit Corp Anti-deflection drain board method and apparatus
DE3131957A1 (de) * 1981-07-24 1983-02-10 Escher Wyss Gmbh, 7980 Ravensburg Entwaesserungseinheit fuer langsieb-papiermaschinen
GB2143871B (en) * 1983-07-23 1986-11-12 Beloit Walmsley Ltd Twin wire paper forming machine
FI851035L (fi) * 1984-05-03 1985-11-04 Beloit Corp Oevre formningsvira i en pappersmaskin.
CA1245900A (fr) * 1984-05-18 1988-12-06 Norman A. Stock Sabot de formation vibrant pour formeurs a double toile
FI885606A (fi) * 1988-12-01 1990-06-02 Ahlstroem Valmet Banformningsfoerfarande och anordning.
FI98540C (fi) * 1989-05-08 1997-07-10 Valmet Corp Laite paperi- tai kartonkirainan muodostamiseksi kuitumateriaalista
JPH038889A (ja) * 1989-06-06 1991-01-16 Mitsubishi Heavy Ind Ltd 抄紙機の湿紙形成装置
DE3927597A1 (de) * 1989-08-22 1991-02-28 Voith Gmbh J M Doppelsieb-former
DE4026953C2 (de) * 1990-01-26 1995-11-30 Escher Wyss Gmbh Entwässerungsvorrichtung und Verfahren zur Entwässerung an einem Doppelsiebformer
DE4002304A1 (de) * 1990-01-26 1991-08-14 Escher Wyss Gmbh Former in einer papiermaschine
DE4005420C2 (de) * 1990-02-21 1995-06-08 Voith Gmbh J M Doppelsiebformer
US5034098A (en) * 1990-02-23 1991-07-23 Beloit Corporation Method of forming a paper web
DE4037017C2 (de) * 1990-11-20 1994-12-08 Escher Wyss Gmbh Naßteil einer Doppelsieb-Papiermaschine
DE4107653A1 (de) * 1991-03-09 1992-09-10 Escher Wyss Gmbh Entwaesserungseinrichtung fuer die nasspartie einer papiermaschine
DE4141607C2 (de) * 1991-12-17 1996-04-25 Voith Gmbh J M Doppelsiebformer
DE9115632U1 (de) * 1991-12-17 1992-11-12 J.M. Voith Gmbh, 7920 Heidenheim Doppelsiebformer

Also Published As

Publication number Publication date
EP0576798A1 (fr) 1994-01-05
JPH0657682A (ja) 1994-03-01
DE59303237D1 (de) 1996-08-22
EP0576798B2 (fr) 1999-03-17
ATE140498T1 (de) 1996-08-15
US5635032A (en) 1997-06-03
DE4219292A1 (de) 1993-12-16

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