EP0933473A2 - Formeur a deux toiles - Google Patents

Formeur a deux toiles Download PDF

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Publication number
EP0933473A2
EP0933473A2 EP98121729A EP98121729A EP0933473A2 EP 0933473 A2 EP0933473 A2 EP 0933473A2 EP 98121729 A EP98121729 A EP 98121729A EP 98121729 A EP98121729 A EP 98121729A EP 0933473 A2 EP0933473 A2 EP 0933473A2
Authority
EP
European Patent Office
Prior art keywords
wire
twin
sieve
zone
former according
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.)
Granted
Application number
EP98121729A
Other languages
German (de)
English (en)
Other versions
EP0933473B1 (fr
EP0933473A3 (fr
Inventor
Günter Dr. Halmschlager
Volker Schmidt-Rohr
Helmut Tausel
Franz Stelzhammer
Erich Brunnauer
Alexander Wassermann
Günther Prinz
James Ronning
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
Voith Sulzer Papiertechnik 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, Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP0933473A2 publication Critical patent/EP0933473A2/fr
Publication of EP0933473A3 publication Critical patent/EP0933473A3/fr
Application granted granted Critical
Publication of EP0933473B1 publication Critical patent/EP0933473B1/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 producing a fibrous web, in particular Paper web, from a fiber suspension.
  • the invention is based on the subject of the document D1 - a twin-wire former is known from this with two sieve belts, which together form a twin sieve zone.
  • the two sieve belts form a wedge-shaped together Inlet gap that receives the pulp suspension directly from a headbox. It is a so-called gap former.
  • the two screens run over a rotating forming roller. Behind in the direction of the wire This forming roller essentially brings the two sieve belts within the twin-wire zone only in contact with forming strips and / or forming shoes.
  • the two wires run within the twin-wire zone essentially in a horizontal direction or rising obliquely. Therefore, the drainage devices located in the loop of the top sieve are required to drain the water relatively high negative pressure.
  • the two sieve belts run essentially vertically from below above, at the inlet nip, first via a forming roller, which is usually called Suction roll is formed. In the drainage boxes located above the forming roller At least some deflecting surfaces are required to drain the water possibly again a vacuum connection.
  • Twin wire formers of the type according to document D1 have proven themselves in practice, especially in the variant with a forming roller arranged directly at the inlet nip. Due to the presence of this forming roller, the two screens become immediate behind the inlet gap on the circumference of the forming roller over a relatively sharply curved Led away; because the jacket of the forming roller has a relatively small radius of curvature, compared to the large radius of curvature of one located at the inlet gap Formation shoe. If now the suspension jet coming from the headbox enters the wedge-shaped inlet gap, a relatively large proportion of the suspension water flows almost straight through the top sieve. This will loosen the Water jet quickly and evenly across the machine width from the top sieve. This condition contributes significantly to a rapid and, in particular, even web formation. In other words, you get a high quality of the finished fibrous web despite one Rapid path formation with a compact, inexpensive construction of the former.
  • Another advantage of a forming roller located at the beginning of the twin wire zone is in the following: As is well known, not only the lower sieve but also the upper sieve is in Longitudinal direction and is stretched with this longitudinal tension when running over the forming roller redirected. This prevents the risk of so-called sieve tubes form that extend in the direction of travel. In other words: the top sieve becomes special also held taut in the transverse direction in the critical initial area of web formation, which in turn contributes to the uniform formation of the path. In particular, a so-called Longitudinal streaks avoided in the paper web.
  • a disadvantage of the twin-wire former known from publication D1 is that a relatively large amount of energy is used in the operation to provide negative pressure. Furthermore it is sometimes difficult to start the former when it becomes a so-called Water is coming. Therefore, the present invention is based on the object known twin-wire former to further develop that the drainage elements the twin-wire zone can be operated with lower negative pressures than previously can and that at the same time with as little effort as possible a stable operating state can be manufactured and maintained in continuous operation.
  • the height of the Vacuum (if this is necessary at all) less than before, thanks to the water drainage (as already mentioned) with the support of gravity. This condition also facilitates the start-up of the former and the establishment of a stable operating state (without risk of water jams).
  • the high arrangement of the headbox reduces the risk of backflow (especially important for low speeds).
  • the headbox also lies there in a clean area with good accessibility and good environmental conditions for control elements, e.g. for the valves for sectioned dilution water addition to set the desired basis weight cross-section of the finished Paper web.
  • control elements e.g. for the valves for sectioned dilution water addition to set the desired basis weight cross-section of the finished Paper web.
  • the forming roller is in a more favorable position than before, so that it can be easily installed or removed with the crane.
  • the new design is ideal for converting four-wire sections because the The height of the existing fourdrinier wire is not relevant. With the previous design, the Headbox is often difficult to accommodate.
  • the twin-wire former shown in FIG. 1 comprises two wire belts, namely an upper wire 11 and a top wire 12. Starting from a forming roller 30, these form a Twin-wire zone. Before the top wire 12 on the circumference of the forming roller 30 with the bottom wire 11 comes into contact, it runs over a breast roller 32. Between the two rollers 30 and 32, the two sieve belts 11 and 12 together form a wedge-shaped inlet gap 28, which receives a fiber suspension directly from a headbox 26.
  • the headbox 26 is only indicated schematically. It is preferably a Headbox 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 designated with a total of 20, has within the loop of the Upper screen 12 in the area of the forming roller 30, a water collecting device 39 a large part of the suspension water reaches the beginning of the Double sieve zone penetrates the upper sieve 12. This occurs essentially in the descending upper range Quadrants of the forming roller 30. Approximately at the level of the forming roller axis of rotation the two sieves 11 and 12 run with the fibrous web formed between them down from the forming roller. You then run over one in the Loop of the upper wire 12 arranged, convexly curved forming shoe 36, the with a plurality of strips 34 abuts the top wire 12. Penetrates between the strips 34 more suspension water in the collecting basin 39.
  • the jacket of the forming roller 30 has recesses for temporary use in a known manner Storing water, e.g. in the form of a honeycomb cover and one attached to it Screen stocking.
  • the forming roller 30 can be used as a suction roller be trained. This applies to all exemplary embodiments.
  • a suction device is shown however, only in Figures 1 and 6, paragraph 29. Also those in the loop of the Upper sieve 12 arranged water collecting device 39 and the forming shoe 36 can be connected to a vacuum source 29 'if required.
  • the twin-wire zone 11 and 12 all of the exemplary embodiments have in common that the two screens in the twin-wire zone 11 and 12, starting from the forming roller 30, run steeply downwards.
  • the twin-wire zone forms an angle with an imaginary vertical plane a, which is between 10 and 50 degrees, in which section the top sieve 12 is always located above the lower sieve 11.
  • the angle a is preferably smaller than 45 degrees.
  • you can still further drainage elements may be provided, e.g. the bottom wire 11 touching Suction boxes 37.
  • a deflection roller 42 is provided, which the two sieve belts 11, 12 are deflected in a substantially horizontal running direction.
  • a separating suction device 15 is provided in the loop of the lower wire 11, on which the Upper sieve 12 stands out from the lower sieve and from the paper web located thereon.
  • the Upper screen 12 runs from here via guide rollers 46 back to breast roller 32.
  • Lower screen 11 runs after the separating suction device 15 - if necessary via at least one further suction box 37 '- to a screen suction roll 33, then via guide rolls 41 back to the forming roll 30.
  • the paper web formed is known Removed from the lower wire 11 by means of a felt 9 and a take-off roller 8.
  • the headbox 26 'and the breast roller 32' are pivoted about the axis of rotation of the forming roller 30, as indicated in Figure 2 with a double arrow 25; see publication D4.
  • the forming roller 30 at least one forming bar which can be pressed resiliently onto the upper wire 12 27 can be provided, as is known from the publication mentioned D3.
  • a special feature of the embodiment of FIG. 3 is that in the steep downward section of the twin-wire zone constant pressure drainage elements 16, 17 are provided; these are preferably perforated plates or plate segments.
  • a constant pressure drainage element 16 is part of a stationary (and possibly drained drainage box) and is, for example, on the upper sieve 12.
  • the Opposite constant pressure drainage element 17 rests with the help of pneumatic hoses 14 on another stationary box; it is hereby by means of a selectable Resilient force adjustable to the lower sieve 11.
  • Equal pressure drainage elements this type is the subject of the patent application mentioned at the beginning under D5; Such elements can also be arranged in the approximately horizontal part of the twin-wire zone be. 6 is between the forming roller 30 and the elements 16/17 a (preferably perforated) convexly curved guide plate 14 on the top wire 14 created to avoid that the sieves temporarily in a straight wire run separate from each other.
  • a special feature of the embodiment shown in FIG. 4 is that within the twin wire zone, the two wire belts 11, 12 except the forming roller 30 only with stationary Drainage elements come into contact, namely with the formation shoe 36, if necessary with the formation bars 38 and a suction box 37.
  • a stationary separating suction device 25 follows. From here the top wire 12 is moved over the guide roller 42 ' returned to the top. After the separating suction device 25, the lower wire 11 continues to run steeply down, preferably via further suction boxes 37 ', after which the paper web by means of Felt 9 and take-off roller 8 is removed from the lower wire 11.
  • FIG. 5 Another variant is shown in FIG. 5.
  • a wire suction roll 35 is provided, via which both screens 11 and 12 with the one in between Run paper web.
  • the screen suction roller 35 has a separating suction zone on which the Bottom wire 11 is separated from the paper web and the top wire 12.
  • the forming roller 30 has a relatively large diameter D. This can be between 1.5 and 2.5 m, for example.
  • D can be between 1.5 and 2.5 m, for example.
  • sealing elements according to the beginning D6 patent application may be provided.
  • the exemplary embodiments shown can be modified as follows: at least one of the forming strips 38 which can be pressed onto the lower sieve 11 (e.g. FIG. 1) and / or at least one of the forming strips which can be pressed onto the upper sieve 12 in a flexible manner 27 (e.g. Fig. 2) can be replaced by a so-called.
  • Fig. 6 The essential peculiarity of Fig. 6 is that the entire web formation without Last takes place, i.e. without introducing pressure pulsations into the fiber suspension.
  • the entire web formation without Last takes place, i.e. without introducing pressure pulsations into the fiber suspension.
  • the twin-wire former according to the invention thus serves to form a layer a multilayer paper or cardboard web.

Landscapes

  • Paper (AREA)
  • Organic Insulating Materials (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
EP98121729A 1998-01-30 1998-11-14 Formeur a deux toiles Expired - Lifetime EP0933473B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803591A DE19803591A1 (de) 1998-01-30 1998-01-30 Doppelsieb-Former
DE19803591 1998-01-30

Publications (3)

Publication Number Publication Date
EP0933473A2 true EP0933473A2 (fr) 1999-08-04
EP0933473A3 EP0933473A3 (fr) 2000-12-06
EP0933473B1 EP0933473B1 (fr) 2004-06-16

Family

ID=7856129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98121729A Expired - Lifetime EP0933473B1 (fr) 1998-01-30 1998-11-14 Formeur a deux toiles

Country Status (6)

Country Link
US (1) US6267846B1 (fr)
EP (1) EP0933473B1 (fr)
JP (1) JP4301619B2 (fr)
AT (1) ATE269439T1 (fr)
CA (1) CA2260511C (fr)
DE (2) DE19803591A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0894894A3 (fr) * 1997-08-01 1999-12-08 Voith Sulzer Papiermaschinen Gesellschaft mbH Procédé et dispositif pour la formation d'une bande de papier
WO2001083882A3 (fr) * 2000-05-02 2002-03-14 Voith Paper Patent Gmbh Dispositif de moulage a bande double
EP1075568B1 (fr) * 1999-01-28 2006-05-03 Voith Paper Patent GmbH Machine et procede permettant de fabriquer une bande de tissu fibreux multicouche
WO2009153164A1 (fr) * 2008-06-06 2009-12-23 Voith Patent Gmbh Procédé de réalisation d'un test liner et/ou d'un matériau ondulé
CN106574442A (zh) * 2014-07-01 2017-04-19 维美德股份公司 从纸浆动量回收能量的可调节装置

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6932886B2 (en) * 2000-03-30 2005-08-23 Voith Paper Patent Gmbh Multi-ply fibrous plasterboard web
DE10020666A1 (de) * 2000-04-27 2001-10-31 Voith Paper Patent Gmbh Doppelsiebformer
DE10122047A1 (de) * 2001-05-07 2002-11-14 Voith Paper Patent Gmbh Blattbildungsvorrichtung und -verfahren
DE10161056A1 (de) * 2001-12-12 2003-06-26 Voith Paper Patent Gmbh Siebpartie
DE10242564A1 (de) * 2002-09-13 2004-03-25 Voith Paper Patent Gmbh Verfahren und Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn
DE10303464A1 (de) * 2003-01-29 2004-09-30 Voith Paper Patent Gmbh Verfahren und Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn
ATE386155T1 (de) * 2002-09-13 2008-03-15 Voith Patent Gmbh Doppelsiebformer zur herstellung einer faserstoffbahn
AT412098B (de) * 2002-11-11 2004-09-27 Andritz Ag Maschf Vorrichtung zur trennung einer papierbahn von einem sieb
DE10255471A1 (de) * 2002-11-28 2004-07-22 Voith Paper Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren
DE10327477A1 (de) * 2003-06-18 2005-01-05 Voith Paper Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn aus mindestens einer Faserstoffsuspension
DE102004032858A1 (de) * 2004-07-07 2006-02-16 Voith Paper Patent Gmbh Doppelsiebformer in einer Maschine zur Herstellung einer Faserstoffbahn und Verfahren zum Herstellen einer Faserstoffbahn
DE202004021817U1 (de) 2004-10-21 2011-06-09 Voith Patent GmbH, 89522 Blattbildungssystem
DE102008002278A1 (de) 2008-06-06 2009-12-10 Voith Patent Gmbh Verfahren zur Herstellung von Testliner und/oder Wellenstoff
DE102008040688A1 (de) * 2008-07-24 2010-01-28 Voith Patent Gmbh Verfahren zur Optimierung der Energiebilanz in Formiereinheiten in Maschinen zur Herstellung von Faserstoffbahnen und Formiereinheit
DE102009000696A1 (de) 2009-02-06 2010-08-12 Voith Patent Gmbh Verfahren zur Herstellung einer mehrlagigen Faserstoffbahn und Blattbildungsvorrichtung zur Durchführung des Verfahrens
DE102009000803A1 (de) 2009-02-12 2010-08-19 Voith Patent Gmbh Doppelsiebformer
FI125148B (fi) * 2011-06-07 2015-06-15 Valmet Technologies Inc Päänvientisovitelma ja päänvientinauhan katkaisulaite kuiturainakonetta varten
DE102011081312A1 (de) 2011-08-22 2013-02-28 Voith Patent Gmbh Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffsuspension
RU2656428C1 (ru) * 2014-06-12 2018-06-05 Диопасс Спрл Устройство для перфорирования пленки
DE102024110101A1 (de) * 2024-04-11 2025-10-16 Voith Patent Gmbh Doppelsiebformer

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GB1262091A (en) * 1968-01-24 1972-02-02 Beloit Corp Improvements in and relating to board- or paper-making machines
US3619362A (en) * 1969-02-03 1971-11-09 Beloit Corp Papermaking headbox stock nozzle with liquid jacket means for elimination of stock exposure to air
BE757784R (fr) * 1969-10-22 1971-04-01 Beloit Corp Dispositif ameliore de formage
CA929772A (en) * 1970-01-26 1973-07-10 Enso-Gutzeit Osakeyhtio Method and apparatus for the manufacturing of paper, cardboard and the like fibrous material web
US3726758A (en) 1971-07-08 1973-04-10 J Parker Twin-wire web forming system with dewatering by centrifugal forces
US3839143A (en) * 1972-06-08 1974-10-01 Beloit Corp Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween
FI760291A7 (fr) * 1976-02-06 1977-08-07 Tampella Oy Ab
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DE8205443U1 (de) * 1982-02-27 1982-07-22 J.M. Voith Gmbh, 7920 Heidenheim Vorrichtung zum kontinuierlichen entwaessern einer faserstoffbahn
DE3222428C2 (de) * 1982-06-15 1985-04-04 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Doppelsieb-Papiermaschine
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DE3927597A1 (de) 1989-08-22 1991-02-28 Voith Gmbh J M Doppelsieb-former
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DE4102065C2 (de) * 1991-01-24 1996-02-01 Voith Sulzer Papiermasch Gmbh Doppelsiebformer
DE4301103C1 (de) * 1993-01-18 1994-08-18 Voith Gmbh J M Siebpartie einer Papiermaschine
DE4328997C2 (de) 1993-08-28 1998-07-02 Voith Gmbh J M Naßpartie eines Doppelsieb-GAP-Formers
DE4420801C2 (de) 1994-06-16 1997-01-30 Voith Gmbh J M Verfahren zum Betreiben einer Doppelsiebzone einer Papiermaschine zur Herstellung von Faserstoffbahnen sowie Siebzone hierzu
DE19530983B4 (de) * 1995-08-23 2006-04-27 Voith Paper Patent Gmbh Vorrichtung zum Herstellen eines mehrlagigen Papiers oder Kartons
DE19733316A1 (de) * 1997-08-01 1999-02-04 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zum Bilden einer Faserstoffbahn
DE19803451A1 (de) 1998-01-30 1999-08-05 Voith Sulzer Papiertech Patent Naßpartie und Verfahren zum Herstellen einer Faserstoffbahn

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0894894A3 (fr) * 1997-08-01 1999-12-08 Voith Sulzer Papiermaschinen Gesellschaft mbH Procédé et dispositif pour la formation d'une bande de papier
EP1075568B1 (fr) * 1999-01-28 2006-05-03 Voith Paper Patent GmbH Machine et procede permettant de fabriquer une bande de tissu fibreux multicouche
WO2001083882A3 (fr) * 2000-05-02 2002-03-14 Voith Paper Patent Gmbh Dispositif de moulage a bande double
US6875309B2 (en) 2000-05-02 2005-04-05 Voith Paper Patent Gmbh Twin wire former
US7332060B2 (en) 2000-05-02 2008-02-19 Voith Paper Patent Gmbh Twin wire former
WO2009153164A1 (fr) * 2008-06-06 2009-12-23 Voith Patent Gmbh Procédé de réalisation d'un test liner et/ou d'un matériau ondulé
CN106574442A (zh) * 2014-07-01 2017-04-19 维美德股份公司 从纸浆动量回收能量的可调节装置
CN106574442B (zh) * 2014-07-01 2019-02-15 维美德股份公司 从纸浆动量回收能量的可调节装置

Also Published As

Publication number Publication date
JP4301619B2 (ja) 2009-07-22
JPH11269793A (ja) 1999-10-05
DE19803591A1 (de) 1999-08-05
ATE269439T1 (de) 2004-07-15
EP0933473B1 (fr) 2004-06-16
EP0933473A3 (fr) 2000-12-06
US6267846B1 (en) 2001-07-31
DE59811574D1 (de) 2004-07-22
CA2260511A1 (fr) 1999-07-30
CA2260511C (fr) 2008-01-08

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