EP0831172B1 - Partie humide et procédé de déshydratation d'une bande fibreuse dans une partie humide - Google Patents

Partie humide et procédé de déshydratation d'une bande fibreuse dans une partie humide Download PDF

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Publication number
EP0831172B1
EP0831172B1 EP97115325A EP97115325A EP0831172B1 EP 0831172 B1 EP0831172 B1 EP 0831172B1 EP 97115325 A EP97115325 A EP 97115325A EP 97115325 A EP97115325 A EP 97115325A EP 0831172 B1 EP0831172 B1 EP 0831172B1
Authority
EP
European Patent Office
Prior art keywords
suction
web
wet end
zones
papermaking machine
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
EP97115325A
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German (de)
English (en)
Other versions
EP0831172A3 (fr
EP0831172A2 (fr
Inventor
Ulrich Begemann
Gerhard Kotischke
Hans Dr. Dahl
Volker Schmidt-Rohr
Josef BÖCK
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
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 filed Critical Voith Paper Patent GmbH
Publication of EP0831172A2 publication Critical patent/EP0831172A2/fr
Publication of EP0831172A3 publication Critical patent/EP0831172A3/fr
Application granted granted Critical
Publication of EP0831172B1 publication Critical patent/EP0831172B1/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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/10—Suction rolls, e.g. couch rolls
    • 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 method for dewatering a Fiber web in a wire section of a paper machine, at which a fiber suspension from a headbox on Sieve is spread and dewatered.
  • the invention further relates to a wire section of a paper machine.
  • the width of the Outlet gap, through which the material jet exits, via the Specifically influenced web width in order to be as uniform as possible Adjust the fabric density cross profile (aperture control). however is the setting of a uniform formation cross profile problematic.
  • EP-A-0 629 740 and DE-A-43 30 546 disclose Twin-wire former with formation strips that overlap extend the web width and one on the sieves Apply varying contact pressure across the web width.
  • the invention has for its object a screen section and a method for dewatering a fibrous web in a To specify the wire section of a paper machine, with which one if possible uniform formation cross profile can be achieved.
  • the object of the invention is in a method according to the achieved at the outset in that the drainage rate seen across the web running direction Reaching the immobility point in the lateral edge areas in the Relationship to the center of the fibrous web by means of a suction device, which extends across the web width the paper machine extends and the one across the web width Has varied suction, in particular a forming roller, is changed such that the formation cross-section is as uniform as possible.
  • the drainage rate seen transversely to the web running direction in the edge areas in Ratio to the center of the fibrous web changed preferably is slowed down before the immobility point is reached becomes a uniformity of the cross-sectional density reached even before the formation cross profile was finally determined is.
  • the Object of the invention by a arranged in front of the immobility point Suction device that extends across the web width of the paper machine extends and a suction effect varied over the web width in order to achieve a formation cross-section that is as uniform as possible has, solved.
  • the drainage device can be a stationary one or rotating element, such as a suction roll.
  • the drainage element is an advantageous further development formed as a suction roll, in particular as a forming roll, the divided into at least two lateral and a central zone which can be acted upon with different negative pressures.
  • the zones can be separated from one another by partitions be displaceable in the axial direction.
  • the drainage rate can be adjusted the edge areas in relation to the drainage speed be changed in the middle.
  • the marginal areas lower suction angle than intended in the middle area, a faster drainage in the middle area to enable.
  • the vacuum is adjustable at least in the peripheral areas.
  • Fig. 1 is a screen section with the number 10 designated.
  • the wire section 10 comprises a so-called duoformer CFD, such as this in the "Wochenblatt für Textilfabrikation” 119, 1992, no. 11/12, page 455-460 is described in detail.
  • the pulp suspension is between a headbox 12 between a forming roll 20 arranged below and one laterally screen guide roller 20 or breast roller arranged obliquely above it diagonally upwards between an upper sieve 16 and a lower sieve 14 shot.
  • the stream of fabric passes diagonally upwards the upper sieve 16 and is discharged via a jet channel (not shown). After the jet channel, the rest water passing through the upper sieve 16 together with the leading edge drainage removed on a vacuum skimmer (likewise not shown) .
  • D-part 24 in which the fibrous web through pulsating forming elements in shape of forming strips 27, 28, which are on both sides of the screens 14, 16 are arranged, is dewatered.
  • immobility point i.e. the point at which a final fixation the fibers between the sieves 14, 16.
  • a suction area connects to the D-part, which is separated by a Wet vacuum cleaner 30 and a combination suction box 32, which is a vacuum cleaner for separating the upper sieve 16 and two flat suction zones, before the lower wire 14 is designed as a suction roll Screen guide roller 34 is guided.
  • the ISO fabric density lines 36 would be transverse to 11 running lines before the immobility point is achieved.
  • the fibrous web 18 at its edge areas becomes a significant homogenization of the formation profile achieved compared to the prior art.
  • a particularly preferred way to control the drainage rate the fibrous web 18 at its edge areas to slow down is to use a forming roller 20, according to FIG. 3, at least in two lateral zones 76, 80 and a central zone 78 divided with different ones Suppress can be applied.
  • the particular advantage of using such a forming roller 20 is that by this special design the forming roller only the dewatering speed the fibrous web 18 is affected in this area, while the drainage rate after leaving the D-part 24 can be largely constant seen over the web width.
  • the forming roller 20 comprises a perforated roller jacket 39 with two roller covers 40, 42, which with tubular extensions and by means of a roller bearing 48, 50 in stationary bearing housings 44, 46 are supported.
  • the latter also wear a stationary suction box, designated 38 in total is.
  • the suction box 38 is composed of e.g. tubular seal support body 41, end plates 58, 60, and Support tubes 52, 54, which rest in the bearing housings 54, 56 and which serve as suction lines on both roller ends.
  • the length of the suction box 38 is in the three suction zones 76, 78, 80 divided, the two lateral zones 76, 80 from the central zone 78 through two partitions 62, 64 are divided.
  • the two edge zones 76, 80 are marked by a Connecting tube 56 connected to each other, so that both of the right side over the support tube 54 with the same negative pressure can be acted upon via a suction line 72 connected fan 74 is generated.
  • the middle zone 78 through the left support tube 52 via a suction line 68 applied with a different vacuum, which over a connected blower 70 is generated.
  • suction zones 76, 78, 80 are through in relation to the perforated jacket Sealing strips 66 sealed, both in the axial direction as well as in the circumferential direction, as can be seen from FIG. 4.
  • the two partitions 62, 64 are in the direction of arrows 82, 84 adjustable towards the center, so the size of the edge zones 76, 80 in relation to the central zone 78.
  • the suction angle ⁇ i.e. the center angle, over which the suction zones extend, in the Edge zones 76, 80 are smaller than in the central zone 78 be to a lower drainage performance in the peripheral areas than allow in the middle.
  • the forming roller 20 also in a larger Number of suction zones can be divided to better Fine adjustment of the drainage speed in the axial direction to enable.
  • one or more of the blowers 70, 74 be designed to be adjustable to the respective suction zones applied vacuum to the respective requirements optimal to be able to vote.

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  • Paper (AREA)

Claims (9)

  1. Procédé de déshydratation d'une suspension de matière fibreuse dans une partie humide (10) d'une machine à papier, dans lequel la suspension de matière fibreuse est déchargée d'une caisse de tête (12) sur une toile (14) et est déshydratée, caractérisé en ce qu'encore avant d'atteindre le point d'immobilisation, la vitesse de déshydratation est modifiée, transversalement à la direction d'avance de la bande (11), dans les régions des bords latéraux par rapport au centre de la bande de matière fibreuse (18) au moyen d'un dispositif d'aspiration qui s'étend sur toute la largeur de la bande de la machine à papier et qui produit un effet d'aspiration varié sur la largeur de la bande, en particulier un cylindre de formage (20), de telle sorte que l'on obtienne un profil transversal de formation aussi uniforme que possible.
  2. Procédé selon la revendication 1, caractérisé en ce que la bande de matière fibreuse (18) est moins fortement aspirée dans les régions des bords latéraux qu'au milieu.
  3. Partie humide (10) d'une machine à papier, caractérisée par un dispositif d'aspiration disposé avant le point d'immobilisation, lequel s'étend sur toute la largeur de la bande de la machine à papier et produit un effet d'aspiration varié sur la largeur de la bande afin d'obtenir un profil transversal de formation aussi uniforme que possible.
  4. Partie humide (10) d'une machine à papier selon la revendication 3, caractérisée en ce que le dispositif d'aspiration est réalisé sous la forme d'un cylindre aspirant, en particulier un cylindre de formage (20), et en ce que le cylindre aspirant est divisé au moins en deux zones latérales (76, 80) et une zone centrale (78), qui peuvent être sollicitées avec des pressions négatives différentes.
  5. Partie humide (10) d'une machine à papier selon la revendication 4, caractérisée en ce que la largeur des zones (76, 78, 80) est variable.
  6. Partie humide (10) d'une machine à papier selon la revendication 4 ou 5, caractérisée en ce que les zones (76, 78, 80) sont séparées les unes des autres par des parois de séparation (62, 64) qui sont déplaçables dans la direction axiale.
  7. Partie humide (10) d'une machine à papier selon l'une ou plusieurs dés revendications 4 à 6, caractérisée en ce que différents angles d'aspiration (α) sont prévus dans les zones individuelles.
  8. Partie humide (10) d'une machine à papier selon l'une ou plusieurs des revendications 4 à 7, caractérisée en ce que la pression négative peut être ajustée au moins dans les zones des bords latéraux (76, 80).
  9. Partie humide (10) d'une machine à papier selon l'une ou plusieurs des revendications 4 à 8, caractérisée par une enveloppe (39) dont la résistance à l'écoulement varie sur la largeur du cylindre.
EP97115325A 1996-09-11 1997-09-04 Partie humide et procédé de déshydratation d'une bande fibreuse dans une partie humide Expired - Lifetime EP0831172B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19636792A DE19636792A1 (de) 1996-09-11 1996-09-11 Siebpartie und Verfahren zum Entwässern einer Faserstoffbahn in einer Siebpartie
DE19636792 1996-09-11

Publications (3)

Publication Number Publication Date
EP0831172A2 EP0831172A2 (fr) 1998-03-25
EP0831172A3 EP0831172A3 (fr) 1998-04-01
EP0831172B1 true EP0831172B1 (fr) 2003-08-06

Family

ID=7805181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97115325A Expired - Lifetime EP0831172B1 (fr) 1996-09-11 1997-09-04 Partie humide et procédé de déshydratation d'une bande fibreuse dans une partie humide

Country Status (3)

Country Link
US (1) US6027612A (fr)
EP (1) EP0831172B1 (fr)
DE (2) DE19636792A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405538B (de) * 1997-11-28 1999-09-27 Andritz Patentverwaltung Vorrichtung zum entwässern einer faserstoffbahn
US6190506B1 (en) * 1998-10-29 2001-02-20 Voith Sulzer Papiertechnik Patent Gmbh Paper making apparatus having pressurized chamber
DE10339262A1 (de) * 2003-08-26 2005-03-17 Voith Paper Patent Gmbh Bahnführungseinrichtung
DE10343914A1 (de) * 2003-09-19 2005-05-04 Voith Paper Patent Gmbh Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren
DE102008000236A1 (de) 2008-02-05 2009-08-06 Voith Patent Gmbh Formiervorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0332599A2 (fr) * 1988-03-09 1989-09-13 Valmet Corporation Procédé et dispositif dans la section de séchage à toile unique d'une machine à papier et un rouleau pour l'utilisation dans le procédé

Family Cites Families (19)

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Publication number Priority date Publication date Assignee Title
DE233618C (fr) *
US483340A (en) * 1892-09-27 Suction-roll for paper-machines
US1805499A (en) * 1930-02-14 1931-05-19 Brown Co Mask for cylinder molds
US2369653A (en) * 1942-06-08 1945-02-20 Beloit Iron Works Multicouch roll papermaking machine
US2714342A (en) * 1950-11-02 1955-08-02 Beloit Iron Works Suction roll
US2929450A (en) * 1957-07-18 1960-03-22 Escher Wyss Gmbh Suction roll for drying pulp webs, more especially in the paper and cellulose industry
US3024839A (en) * 1959-05-18 1962-03-13 Beloit Iron Works Suction regulating means
US3322617A (en) * 1964-05-22 1967-05-30 Dexter Corp Paper making apparatus to form paper with a simulated woven texture
US3549742A (en) * 1967-09-29 1970-12-22 Scott Paper Co Method of making a foraminous drainage member
BE757981A (fr) * 1969-11-14 1971-04-01 Neyrpric Bmb Dispositif de controle d'egouttage d'une suspension de particules pour la realisation d'un voile
US3881987A (en) * 1969-12-31 1975-05-06 Scott Paper Co Method for forming apertured fibrous webs
US3775244A (en) * 1971-10-14 1973-11-27 Rhodiaceta Apparatus for manufacturing nonwoven textiles
CA1155370A (fr) * 1980-10-16 1983-10-18 Huyck Corporation Toile d'assechement, et methode de fabrication connexe
DE3123131C2 (de) * 1981-06-11 1986-01-09 J.M. Voith Gmbh, 7920 Heidenheim Entwässerungswalze mit Wasserabführungselement für ein Papiermaschinen-Siebband
US4980979A (en) * 1987-02-13 1991-01-01 Beloit Corporation Vacuum roll transfer apparatus
FI97245C (fi) * 1989-12-12 1996-11-11 Valmet Paper Machinery Inc Paperikoneen imutela
DE9212448U1 (de) * 1992-09-16 1992-11-05 J.M. Voith Gmbh, 7920 Heidenheim Doppelsiebformer mit örtlich verstellbarer Entwässerungsleiste
FI103995B1 (fi) * 1993-06-17 1999-10-29 Valmet Paper Machinery Inc Menetelmä ja laite sekä säätöjärjestely paperikoneessa paperirainan poikittaisen profiilin hallinnassa
US5766419A (en) * 1996-07-23 1998-06-16 Valmet Corporation Twin-wire gap former in a paper machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0332599A2 (fr) * 1988-03-09 1989-09-13 Valmet Corporation Procédé et dispositif dans la section de séchage à toile unique d'une machine à papier et un rouleau pour l'utilisation dans le procédé

Also Published As

Publication number Publication date
US6027612A (en) 2000-02-22
DE19636792A1 (de) 1998-03-12
DE59710534D1 (de) 2003-09-11
EP0831172A3 (fr) 1998-04-01
EP0831172A2 (fr) 1998-03-25

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