EP0497932B1 - Ejecteur a fente, notamment pour machines a papier a deux toiles - Google Patents

Ejecteur a fente, notamment pour machines a papier a deux toiles Download PDF

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Publication number
EP0497932B1
EP0497932B1 EP91913352A EP91913352A EP0497932B1 EP 0497932 B1 EP0497932 B1 EP 0497932B1 EP 91913352 A EP91913352 A EP 91913352A EP 91913352 A EP91913352 A EP 91913352A EP 0497932 B1 EP0497932 B1 EP 0497932B1
Authority
EP
European Patent Office
Prior art keywords
wire
twin
former
slot
section
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
EP91913352A
Other languages
German (de)
English (en)
Other versions
EP0497932A1 (fr
Inventor
Alfred Bubik
Otto Hildebrand
Karl Müller
Jörg Walter
Helmut Störr
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.)
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Publication date
Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0497932A1 publication Critical patent/EP0497932A1/fr
Application granted granted Critical
Publication of EP0497932B1 publication Critical patent/EP0497932B1/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
    • 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 paper or board machine according to the preamble of claim 1.
  • the twin-wire former of the type mentioned above has a slot nozzle, sometimes also called an autoslice, for removing the white water emerging through the top wire from the suspension layer to be dewatered and formed between the screens. While the white water is relatively easy to drain down from the lower sieve, using gravity, the white water has to be drained from the upper sieve against gravity, essentially vertically upwards. With the kinetic energy of the water moving at the speed of the sieves, the water rises along a wall in the way of the slot nozzle and can be skimmed off and removed from the upper sieve, possibly using a vacuum.
  • EP 0 373 133 A2 shows a generic twin wire former with a slot nozzle with two walls running across the width of the wire and transverse to the wire. The rear of these walls touches the top sieve and has a fixed position.
  • twin wire formers and their use are known, for example, from the following publications:
  • twin wire former according to EP 0 289 445, a long shoe is first arranged on the lower wire.
  • the upstream white water cannot be removed directly from the top sieve by the downstream slot nozzle.
  • the formation of the upper side of the suspension is not improved by pressure pulses.
  • DE-PS 11 16 967 shows water-removing guide elements and pacifiers, which remove the white water upwards, but are not suitable for controlling the formation.
  • a primary and a secondary autoslice are present, which are set rigidly with respect to the top sieve, and the suspension layer to be formed can be crushed and damaged.
  • the distance between the slot nozzles and the top sieve is considerable, which can lead to undesirable fog formation.
  • the object of the invention is to provide a twin wire former which has an upwardly clean and reliably functioning slot nozzle, with which it is possible to exert several pressure impulses which support a good formation and act on the surface of the suspension, whereby the adjustment of the slot nozzle to the top sieve, ie can be automatically adjusted simultaneously to its position at different thicknesses of the suspension layer between the sieves.
  • the adjustment of the slot nozzle to the top sieve ie can be automatically adjusted simultaneously to its position at different thicknesses of the suspension layer between the sieves.
  • the slot nozzle should also be used to advantage in the production of so-called heavy types of paper or cardboard (e.g. liner board, corrugated material, etc.).
  • the slot nozzle 1 which is used in a twin wire former 2 of a paper or board machine, is primarily intended for removing the white water from the upper wire 3 of the twin wire former. It has a water-carrying space 4, which is formed between two walls 5 and 6 running across the entire width of the sieve 3.
  • the front wall 5 in the running direction of the screen is shorter in the direction of the screen 3 than the rear wall 6, which in its operating position extends to the screen 3, with a between the lower edge of the shorter front wall 5 and the screen 3 Gap 7 exists.
  • the rear wall 6 has two horizontally extending parts 8 and 9.
  • the upper part 8 is fixed in the operating position and the lower part 9, which faces the sieve 3, is designed and arranged as a diaphragm which is displaceable along the upper part and partially overlapping it.
  • This part 9 is adjustable both in the direction of the screen 3 and in the direction away from the screen 3. In the respectively set position, the part 9 is elastically supported in the direction against the sieve 3 on the upper, fixed part 8.
  • the servomotor according to the exemplary embodiment shown here has two pressure chambers, an upper pressure chamber 22, which is provided for the movement of the lower part 9 upwards, and a lower pressure chamber 23, which for the movement of the lower part 9 downwards in the direction of the screen 3 is provided.
  • the rooms 22 and 23 are lined with tight but elastic hoses that can be pressurized with a medium.
  • the pressure is supported elastically so that the lower edge 25 of the lower part 9 facing the screen 3, which is provided with a wear-resistant material layer 24, can follow a changing position of the screen 3. This position changes during operation when the thickness of the suspension layer changes.
  • the adjustment is done automatically.
  • the white water rises through the water-carrying space 4 and flows into a collecting space 26, from which it flows out through an opening 27.
  • the collecting room can be created in front of or behind room 4.
  • a compact dewatering unit can be put together from the individual slot nozzles, which can also be adjusted as a whole unit relative to the screen.
  • FIG. 2 shows an example of a twin wire former 2 with slot nozzles 1 according to the invention. It has a support plane which is defined by the arrangement and shape of support elements 11 to 13 or 14 to 17. These support elements are of a known type and serve both to discharge the white water downwards and to introduce pressure pulses onto the lower side of the suspension layer to be formed between the upper sieve 3 and the lower sieve 18, which run along the support plane.
  • a number of slot nozzles 1, in operation the upper sieve 3 is arranged in contact, in each case one slot nozzle on the section which is delimited by the respectively adjacent support elements 11 and 12, or 12 and 13 is, in each case in the wire running direction behind the support element 11, or 12, or 13.
  • the section equipped with the support nozzles 1 is followed by a section equipped with a press shoe 19 of known type, in which 18 additional support elements 14 to 15 in the area on the bottom wire of the press shoe 19 are arranged.
  • the suspension is injected between the screens at the location between the breast rolls 20 and 21 through a headbox nozzle 28.
  • the upper breast roll 20 is a full roll
  • the lower breast roll 21 is an open roll which receives and removes white water.
  • FIG. 3 Another possible arrangement of the jet region is shown in FIG. 3 with a headbox 28 'essentially forming a jet upwards on a breast roller 21', in the centrifugal region of which the first suction nozzle is effective.
  • twin-wire former which, in contrast to the previously described in the running direction of the wires, first arranged a press shoe (like 19) on the top wire, which section is followed by a section equipped with a few slot nozzles (like 1).
  • a support structure 29 is advantageous, to which the individual elements can be attached or moved.

Landscapes

  • Paper (AREA)
  • Sheet Holders (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Nozzles (AREA)

Claims (10)

  1. Former à deux toiles (2) d'une machine à papier ou à carton, comportant une toile supérieure (3), une toile inférieure (18) et une buse à fente (1) pour l'évacuation de l'eau de filtrage de la toile supérieur (3) du former, qui présente un volume (4) guidant l'eau, lequel est formé entre deux parois (5 et 6) s'étendant transversalement à la toile (3), sur la largeur de la toile, la paroi avant (5) dans le sens de circulation de la toile étant espacée de celle-ci, de sorte qu'entre le bord inférieur de la paroi avant (5) et la toile, il existe une fente (7), la paroi arrière (6) s'étendant dans sa position de service jusqu'à la toile, et une surface de guidage se trouvant sur le côté des toiles (3, 18), opposé à la buse à fente, caractérisé en ce que la paroi arrière (6) dans la position réglée est soutenue élasliquement dans le sens contraire à la toile et comporte deux parties (8 et 9) sensiblement superposées et déplaçables l'une par rapport à l'autre, la partie supérieure (8) étant fixe dans la position de service et la partie inférieure (9), dirigée vers la toile, étant configurée et disposée le long de la partie supérieure, en tant que diaphragme déplaçable vers celle-ci, la recouvrant partiellement, et étant déplaçable de manière réglable tant en direction de la toile que dans la direction s'éloignant de celle-ci.
  2. Former à deux toiles (2) selon la revendication 1, caractérisé en ce que la surface de guidage est élastique.
  3. Former à deux toiles (2) selon la revendication 2, caractérisé en ce qu'il existe un réglage pour la position des toiles entre la buse à fente élastique et la surface de guidage élastique.
  4. Former à deux toiles (2) selon la revendication 1, caractérisé en ce qu'il est prévu un servomoteur (10) pour le coulissement et l'appui élastique de la partie inférieure (9).
  5. Former à deux toiles (2) selon la revendication 1, caractérisé en ce que le bord inférieur (25), dirigé vers la toile, de la partie inférieure (9) est pourvu d'une couche de matière (24) résistant à l'usure.
  6. Former à deux toiles (2) selon l'une des revendications précédentes avec une surface d'appui prédéterminée par la disposition et la forme d'éléments d'appui (11, 12, 13 et 14, 15, 16, 17), le long de laquelle les toiles, la tuile supérieure (3) et la toile inférieure (18) sont guidées avec la couche de suspension à former et à déshydrater, caractérisé en ce qu'un nombre de buses à fente (1) est disposé dans le sens de circulation au début du parcours de formage, en contact avec la toile supérieure (3) ; une buse à fente (1) étant placée sur le tronçon de toile entre deux éléments d'appui (11 et 12 ou 12 et 13) voisins, formant au moins une partie de la surface de guidage, ou dans le sens de circulation derrière l'élément d'appui (11, ou 12, 13) ; le tronçon équipé des buses à fente étant suivi d'un tronçon équipé d'un patin de pression (19), d'autres éléments d'appui (14, 15, 16 et 17) étant disposés sur la toile inférieure (18) et dans la région du patin de pression (19).
  7. Former à deux toiles (2) selon l'une des revendications 1 à 5, avec une surface d'appui prédéterminée par la disposition et la forme d'éléments d'appui (11, 12, 13 et 14, 15, 16, 17), le long de laquelle les toiles, la toile supérieure (3) et la toile inférieure (18), sont guidées avec la couche de suspension à former et à déshydrater, caractérisé en ce que dans le sens de circulation, au début du parcours de formage, il est prêvu un tronçon équipé d'un patin de pression (19) ; les éléments d'appui (14, 15, 16 et 17) étant prévus sur la toile inférieure (18) dans la région du patin de pression (19) ; à ce tronçon faisant suite un nombre de buses à fente (1), qui chaque fois sont en contact avec la toile supérieure (3) une buse à fente (1) étant placée sur le tronçon de toile entre deux autres éléments d'appui (11 et 12, ou 12 et 13) voisins, formant au moins une partie de la surface de guidage, ou dans le sens de circulation, derrière l'élément d'appui (11, ou 12, ou 13).
  8. Former à deux toiles (2) selon la revendication 6, caractérisé en ce qu'en amont du tronçon équipé de buses à fente (1) sont montés des rouleaux de tête (20 et 21), dont le rouleau supérieur (20) est un rouleau massif et le rouleau inférieur (21) est un rouleau ouvert, évacuant l'eau de filtrage.
  9. Former à deux toiles (2) selon la revendication 4, caractérisé en ce que le servomoteur (10) comporte deux chambres de pression (22, 23), qui sont revêtues de manière étanche avec des tuyaux en matière élastique, lesquels tuyaux peuvent être alimentés avec un fluide sous pression.
  10. Former à deux toiles dans une machine à papier ou à carton comportant plusieurs buses à fente selon la revendication 1, caractérisé en ce que plusieurs buses à fente réunies en une unité de construction sont déplaçables par rapport auquel la toile en contact avec celles-ci.
EP91913352A 1990-09-05 1991-07-30 Ejecteur a fente, notamment pour machines a papier a deux toiles Expired - Lifetime EP0497932B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4028126A DE4028126C2 (de) 1990-09-05 1990-09-05 Schlitzdüse, insbesondere für einen Doppelsiebformer und deren Verwendung in einem Doppelsiebformer
DE4028126 1990-09-05
PCT/DE1991/000611 WO1992004500A1 (fr) 1990-09-05 1991-07-30 Ejecteur a fente, notamment pour machines a papier a deux toiles

Publications (2)

Publication Number Publication Date
EP0497932A1 EP0497932A1 (fr) 1992-08-12
EP0497932B1 true EP0497932B1 (fr) 1996-02-14

Family

ID=6413634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91913352A Expired - Lifetime EP0497932B1 (fr) 1990-09-05 1991-07-30 Ejecteur a fente, notamment pour machines a papier a deux toiles

Country Status (6)

Country Link
EP (1) EP0497932B1 (fr)
AT (1) ATE134233T1 (fr)
CA (1) CA2050647A1 (fr)
DE (2) DE4028126C2 (fr)
FI (1) FI97306C (fr)
WO (1) WO1992004500A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29619709U1 (de) * 1996-11-13 1997-01-09 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Siebpartie einer Papiermaschine
DE19651241A1 (de) * 1996-12-10 1998-06-18 Voith Sulzer Papiermasch Gmbh Doppelsieb-Blattbildungseinrichtung
FI991356A (fi) * 1999-06-14 2000-12-15 Valmet Corp Menetelmä veden poistamiseksi sellunkuivatuskoneen viiraosalla ja vede npoistoyksikkö
GB2370046A (en) 2000-12-15 2002-06-19 Astenjohnson Inc Adjustable resilient blade support
GB0030682D0 (en) * 2000-12-15 2001-01-31 Astenjohnson Inc Suction assisted skimmer blade
AT503404A1 (de) * 2006-04-13 2007-10-15 Bartelmuss Klaus Ing Verfahren zur steuerung der temperatur der keramischen elemente einer abstütz- bzw. abstreifleiste in einer anlage zur papiererzeugung sowie einrichtung und abstütz- bzw. abstreifleiste zur durchführung dieses verfahrens
DE102007035488A1 (de) * 2007-07-28 2009-01-29 Voith Patent Gmbh Verfahren zur Herstellung einer Faserstoffbahn und Doppelsiebformer zur Durchführung des Verfahrens

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143871B (en) * 1983-07-23 1986-11-12 Beloit Walmsley Ltd Twin wire paper forming machine
JPS61502307A (ja) * 1984-06-07 1986-10-16 デザイン　アンド　インダストリイ　プロプライエタリイ　リミテツド アイシ−ルド
GB2174120B (en) * 1985-04-26 1988-08-10 Doerries Gmbh Apparatus for guiding the wires of a twin wire forming section of a paper or cardboard machine
GB8710428D0 (en) * 1987-05-01 1987-06-03 Beloit Corp Multi-ply web forming apparatus
FI77281C (fi) * 1987-06-18 1989-02-10 Valmet Paper Machinery Inc Hybridformare foer en pappersmaskin.
FI85885C (fi) * 1987-11-25 1992-06-10 Tampella Oy Ab Foerfarande foer formering av en fiberbana i en pappersmaskin samt en anordning foer utfoering av foerfarandet.
FI84637C (fi) * 1988-12-01 1991-12-27 Valmet Paper Machinery Inc Foerfarande och anordning vid formning av pappers- eller kartongbana.
DE3842155A1 (de) * 1988-12-15 1990-06-21 Voith Gmbh J M Doppelsiebformer zur herstellung einer papierbahn

Also Published As

Publication number Publication date
FI97306C (fi) 1996-11-25
EP0497932A1 (fr) 1992-08-12
FI97306B (fi) 1996-08-15
DE4028126C2 (de) 1993-10-14
DE59107409D1 (de) 1996-03-28
CA2050647A1 (fr) 1992-03-13
WO1992004500A1 (fr) 1992-03-19
FI921813A0 (fi) 1992-04-23
DE4028126A1 (de) 1992-03-19
FI921813A (fi) 1992-04-23
ATE134233T1 (de) 1996-02-15

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