EP0576798B2 - Section de formage à deux toiles - Google Patents

Section de formage à deux toiles Download PDF

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Publication number
EP0576798B2
EP0576798B2 EP93106775A EP93106775A EP0576798B2 EP 0576798 B2 EP0576798 B2 EP 0576798B2 EP 93106775 A EP93106775 A EP 93106775A EP 93106775 A EP93106775 A EP 93106775A EP 0576798 B2 EP0576798 B2 EP 0576798B2
Authority
EP
European Patent Office
Prior art keywords
wire
guide surface
twin
accordance
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
Other languages
German (de)
English (en)
Other versions
EP0576798B1 (fr
EP0576798A1 (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
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
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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
Anticipated expiration legal-status Critical
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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

  • twin wire former is part of a paper machine and essentially serves one on one permeable sieve surface spread out, for paper production to dewater certain fiber suspension and the constituents contained in the suspension to distribute or arrange in the desired form.
  • the invention is based on the subject of the document D1, from which a twin wire former of the following design is described:
  • a bottom wire runs over one curved formation shoe, the wire guide surface formed by strips that are not individually adjustable, or by using an equivalent Panel with openings or slots.
  • the formation shoe can be swiveled stored and adjustable by means of a lifting device.
  • twin-wire zone begins, i.e. a top sieve is running from here on together with the lower sieve and with the one between the two sieves paper stock through the twin wire former.
  • twin wire zone a drainage of the paper stock both down and take place upwards.
  • the invention has for its object a To create twin wire formers with which the formation is very evenly possible and set in a wide range can be.
  • the equipment effort should be kept as low as possible.
  • a twin wire former is known from the publication D4, in which the lower wire is led through several individual strips. Each of these individual strips rests on an elastic force element, which in turn is supported on a table is. In a variant, this table is also on elastic force elements supported. The force with which each bar is pressed against the bottom wire is individually adjustable. The wire run along this individually controllable strips can be flat, curved or wavy. About the last However, the variant mentioned does not specify D4.
  • the design according to the invention has the object of Document D4 the additional advantage that the number of elastic required Force elements per formation shoe is only two. Usually there is only one only formation shoe available, so only a total of two force elements.
  • the license plate can still contain a lot of water and therefore also very sensitive suspension layer gentle and be dewatered if the formation is good.
  • the invention does not become the guide surface for the first sieve about rigidly positioned, but by one essentially force directed against the sieve, i.e. non-positive pressed against the bottom wire loop, the so applied force essentially the fabric tension of the first sieve, partly that of the second sieve and the Weight forces supported.
  • the advantage of the invention comes particularly to be used when other parts in contact with the sieve are in immediate Neighborhood of the frictionally guided Guide surface are rigidly positioned.
  • the shoe can also with an uneven suspension height dodge on the sieve ("soft nip entrance"). All of this results in a soft formation, such as especially with writing and printing paper is in demand. But other types of paper also require one good leaf uniformity.
  • twin wire former By choosing the fabric tension and the radii of curvature the twin wire former is optimal match the desired paper quality.
  • the one lying in the second sieve Guide surface the opposite direction of curvature on. In this area it can still contained water is particularly effective due to suction support into a suction roll or a suction box be directed.
  • the suction box can one, in the running direction seen, included from the lying suction gap, that in the area of the curved in the first sieve Management area is sufficient and thus in the area before reversing the direction of curvature.
  • Twin wire formers can in many cases be a suction box in the second sieve, i.e. he must not be adjustable in the operation of the system, or it a fixed suction roller can also be provided be. Often it becomes independent accordingly the fabric tension and the set support force for the guiding surface in the first sieve is sufficient, around the elements of the twin wire former in the desired Way to position relative to each other without further management areas are changed in their position. Of course, is also in front of the yielding guide surface another rigidly positioned drainage system conceivable.
  • Fig. 1 shows schematically an embodiment of the twin wire former according to the invention.
  • a moving one endless first sieve 1, here first as a fourdrinier is carried out via a headbox 5 with a suspension layer 3 provided, which then one Part of the water contained through the first sieve 1 emits which the suspension layer lying on it 3 leads to the subsequent sheet formation area, which on a curved guide surface 4 over a Siebenisch 12 lies.
  • the sieve table 12 is both in front as well as at the back, seen in the direction of the sieves, supported by force elements 9 and is against the sieves movable (double arrows).
  • the second sieve 2 is called Upper screen in the sheet formation area mentioned approximately tangentially on the suspension layer on the first screen 1 3 forwarded, it being from this Contact line from essentially the shape of the first Adjust sieves.
  • the suction box installed in the second sieve 6 leads water up through the second sieve 2 from. (The water is indicated by arrows in this figure.) It is essentially behind the sheet formation area 5 arranged, but can at least partially its effect also in the sheet formation area. Because the one facing the second sieve Guide surface 7 of the suction box 6 a different direction Has curvature than in the sheet formation area, takes place - seen in the direction of rotation of the twin wire - a reversal of curvature.
  • Fig.3 a little more detailed but still shown schematically, you can see in this example one of the ways the curved guide surface 4 to design.
  • the strips 13 are on the sieve table 12 arranged and shaped so that the entirety their surfaces facing the first sieve 1 are convex formed contour. It is expedient also the area of the individual strips themselves with one Radius of curvature provided, which is the radius of curvature corresponds approximately to the guide surface 4.
  • Deformable packing elements are shown as force elements 9, that can be filled with a print medium. In this way a force can be found in these elements generate which in the intended operating range as far as possible from the position of the sieve table 12 is independent.
  • the pressure in one is through pipes connected with those serving as force elements 9 Pressure vessel 15 applied.
  • This arrangement is also able to compensate for hydraulic oscillations To dampen line resistance. If necessary the packing can also be used with different pressures be charged.
  • the part of the twin wire former shown can also be designed as a suction box means that the water between the ledges 13 after is sucked down.
  • Fig.1 the example of a hybrid former 2 shows a so-called gap former. This does not apply the Fourdrinier section, and the headbox 5 'leads the Suspension directly as a wide jet in the area of Sieve union.
  • Another variant is here the curved guide surface 4 instead of strips generated by a plate 13 ', also the force elements 9 are designed as springs.
  • the sheet formation area can be different be designed.
  • E.g. 4 shows a number of Moldings rigidly connected to each other in groups each group in turn - both initially, as well as seen at the end in the direction of wire travel - force elements 9 has.
  • pressure bars which are partially rigidly interconnected and each with its own power elements. Furthermore here is the guide surface 7 for the second sieve 2 formed by a suction roller 17.
  • FIG. 7 and 8 show very schematically that the invention Twin wire former also a vertical former can be.
  • the suspension becomes essentially vertically between sieves 1 and 2 as a wide jet injected.
  • the guide surface 4 of the first Sieves 1 In the area of merging the sieve is the guide surface 4 of the first Sieves 1.
  • the water is removed through both sieves.
  • the adjoining guide surface 7 can be formed by a suction or forming roll.
  • Fig. 8 it is shown that in the special case can have the same direction of curvature as the previous one Guide surface 4.

Landscapes

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

Claims (16)

  1. Section de formage à deux toiles comprenant une première toile (1) et une seconde toile (2), une couche de suspension (3) se formant sur la première toile (2) et la première toile (1) avec la couche de suspension (3) sont conduites dans une zone de formation de feuille formée par une surface de guidage (4) en partie cintrée au moins dans la direction de circulation de la toile,
    la surface de guidage (4) de la première toile (1) est formée d'un patin (12) muni d'une règle (13) s'étendant essentiellement transversalement à la direction de passage, ou par une plaque (13') munie d'orifices ou de fentes, et, dans la zone de la surface de guidage (4), cintrée pour la première toile (1), la deuxième toile est mise en contact avec la couche en suspension (3) qui se trouve sur la première toile (1),
    et sur la face de la deuxième toile (2), opposée à la couche de suspension, il y a une surface de guidage (7) cintrée dans la direction opposée, suivante, pour la seconde toile (2), à travers laquelle on aspire l'eau qui a passé,
    caractérisée en ce que
    le patin (12) ou la plaque (13') sont appuyés de façon mobile essentiellement en direction par rapport à la première toile, pour s'en rapprocher ou s'en écarter, avec un appui par la force, à savoir à l'aide d'éléments de force (9), élastiques, qui sont, de manière connue en soi, déformables et remplis d'un milieu mis en pression.
  2. Section de formage à deux toiles selon la revendication 1,
    caractérisée en ce que
    le patin (12) ou la plaque (13') sont guidés en direction de la toile (1) pour qu'un angle par rapport à l'environnement ne change pas.
  3. Section de formage à double toile selon la revendication 1 ou 2,
    caractérisée en ce que
    le patin (12) ou la plaque (13') font partie d'une caisse aspirante.
  4. Section de formage à double toile selon les revendications 1, 2, 3,
    caractérisée en ce qu'
    à la fois à l'entrée et à la sortie du patin (12) ou de la plaque (13'), dans le sens de passage de la toile, il est prévu chaque fois au moins un élément de force (9).
  5. Section de formage à.double toile selon la revendication 1,
    caractérisée en ce que
    la surface de la règle (13) présente une courbure correspondant essentiellement à la courbure globale de la surface de guidage (4).
  6. Section de formage à double toile selon la revendication 1,
    caractérisée en ce que
    la surface de guidage (7), pour la seconde toile (2), est fixe en position comme cela est connu en soi.
  7. Section de formage à double toile selon la revendication 1,
    caractérisée en ce que
    la surface de guidage (7) de la seconde toile (2) est en forme de caisse aspirante (6) pour évacuer l'eau qui traverse, comme cela est connu en soi.
  8. Section de formage à double toile selon la revendication 7,
    caractérisée en ce que
    la surface de guidage (7) de la caisse aspirante (6) est formée par des règles qui s'étendent essentiellement transversalement à la direction de passage comme cela est connu en soi.
  9. Section de formage à double toile selon la revendication 8,
    caractérisée en ce que
    la surface des règles présente une courbure qui correspond essentiellement à la courbure globale de cette surface de guidage (7).
  10. Section de formage à double toile selon la revendication 8,
    caractérisée par
    une première règle fermée, dans le sens de passage, qui constitue l'entrée de la surface de guidage (7) de la caisse aspirante (6) et, présente une courbure, comme cela est connu, dont le sens de courbure est opposé à celui de la surface de guidage (4) qui se trouve en amont pour la première toile (1).
  11. Section de formage à double toile selon la revendication 10,
    caractérisée en ce que
    la première règle, fermée, vue dans la direction de passage, est au moins de longueur double dans la direction de passage par rapport aux règles suivantes.
  12. Section de formage à double toile selon la revendication 1,
    caractérisée en ce que
    la surface de guidage (7) de la seconde toile (2) est formée par un cylindre aspirant pour évacuer l'eau qui traverse.
  13. Section de formage à double toile selon la revendication 1,
    caractérisée en ce que
    la surface de guidage (7) de la seconde toile (2) est réalisée de manière connue sous la forme d'un cylindre de formage pour évacuer l'eau qui traverse.
  14. Section de formage à double toile selon la revendication 1,
    caractérisée par
    une première fente d'aspiration (8) pour la seconde toile (2), située directement à la réunion des deux toiles (1 et 2), c'est-à-dire à l'intérieur de la zone de la surface de guidage (4).
  15. Section de formage à double toile selon la revendication 1,
    caractérisée en ce qu'
    en amont de la surface de guidage (4) cintrée de la première toile (1), et séparément de celle-ci, il est prévu au moins une autre surface de guidage fixe en contact avec la première toile (1), comme cela est connu en soi.
  16. Section de formage à double toile selon la revendication 1,
    caractérisée par
    des amortisseurs pour amortir des oscillations verticales de la surface de guidage (4), cintrée, mobile verticalement, de 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
DE4219292A DE4219292A1 (de) 1992-06-12 1992-06-12 Doppelsiebformer
DE4219292 1992-06-12

Publications (3)

Publication Number Publication Date
EP0576798A1 EP0576798A1 (fr) 1994-01-05
EP0576798B1 EP0576798B1 (fr) 1996-07-17
EP0576798B2 true 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
FI965277L (fi) * 1996-12-31 1998-07-01 Valmet Corp Paperikoneen imulaatikko ja menetelmä paperikoneen imulaatikossa
CN1886555B (zh) * 2003-12-22 2011-01-12 阿斯顿约翰逊公司 用于造纸机的混合型成形部
US7776183B2 (en) * 2004-11-23 2010-08-17 Astenjohnson, Inc. Twin wire gap former paper making machine with variable wrap impingement shoe
JP5444362B2 (ja) * 2008-10-21 2014-03-19 アステンジョンソン・インコーポレーテッド 複数の排水シューを有するツインファブリック形成部
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
FI851035A7 (fi) * 1984-05-03 1985-11-04 Beloit Corp Paperikoneen yläviiramuodostaja.
CA1245900A (fr) * 1984-05-18 1988-12-06 Norman A. Stock Sabot de formation vibrant pour formeurs a double toile
FI885606A7 (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
DE9115632U1 (de) * 1991-12-17 1992-11-12 J.M. Voith Gmbh, 7920 Heidenheim Doppelsiebformer
DE4141607C2 (de) * 1991-12-17 1996-04-25 Voith Gmbh J M Doppelsiebformer

Also Published As

Publication number Publication date
ATE140498T1 (de) 1996-08-15
DE4219292A1 (de) 1993-12-16
DE59303237D1 (de) 1996-08-22
US5635032A (en) 1997-06-03
EP0576798B1 (fr) 1996-07-17
JPH0657682A (ja) 1994-03-01
EP0576798A1 (fr) 1994-01-05

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