WO1992004500A1 - 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
WO1992004500A1
WO1992004500A1 PCT/DE1991/000611 DE9100611W WO9204500A1 WO 1992004500 A1 WO1992004500 A1 WO 1992004500A1 DE 9100611 W DE9100611 W DE 9100611W WO 9204500 A1 WO9204500 A1 WO 9204500A1
Authority
WO
WIPO (PCT)
Prior art keywords
sieve
slot nozzle
slot
section
wire
Prior art date
Application number
PCT/DE1991/000611
Other languages
German (de)
English (en)
Inventor
Alfred Bubik
Otto Hildebrand
Karl Müller
Jörg Walter
Helmut Störr
Original Assignee
Sulzer-Escher Wyss 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 Sulzer-Escher Wyss Gmbh filed Critical Sulzer-Escher Wyss Gmbh
Priority to DE59107409T priority Critical patent/DE59107409D1/de
Priority to EP91913352A priority patent/EP0497932B1/fr
Publication of WO1992004500A1 publication Critical patent/WO1992004500A1/fr
Priority to FI921813A priority patent/FI97306C/fi

Links

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 slot nozzle according to the preamble of claim 1 and its arrangement in a twin wire former of a paper or board machine.
  • a slot nozzle of the above-mentioned type is used in particular in twin-wire formers to remove 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 must 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.
  • 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-draining 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, with the suspension layer to be formed
  • the object of the invention is to provide a slotted nozzle that functions cleanly and reliably at the top, or a dewatering unit having such slotted nozzles, with which it is possible to apply several pressure pulses that support a good formation and act on the surface of the suspension to exercise, the adjustment of the slot nozzle to the top wire, ie can be automatically adjusted simultaneously to its position at different thicknesses of the suspension layer between the sieves.
  • the slot nozzle it should be possible with the slot nozzle to convert a four-wire section of a paper machine into a double-wire section relatively easily.
  • 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.).
  • REPLACEMENT LATT Fig. 1 shows an embodiment of the slot nozzle on a larger scale
  • Fig. 2 shows an example of a twin wire former with slot nozzles according to the invention
  • Fig. 3 shows another example with a varied arrangement of the headbox.
  • the slot nozzle 1 which is used in particular 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 8 has two horizontally extending parts 6 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 can be displaced along the upper part and partially overlaps it.
  • This part 9 is slidably adjustable both in the direction towards the wire 3 as well as ⁇ ⁇ direction of the screen 3 away. In the respectively set position, the part 9 is elastically supported in the direction against the sieve 3 on the upper, fixed part 8.
  • a servomotor 10 arranged between the upper part 8 and the lower part 9 is provided for displacing and elastically supporting the lower part 9.
  • the steep motor 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 dense 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 are used both for discharging the white water downwards and for introducing pressure pulses onto the lower side of the suspension layer to be formed between the upper sieve 3_ and the lower sieve 18, which circulate along the support plane.
  • a number of slot nozzles 1, during operation touching top sieve 3 is arranged, each with a slot nozzle on the section delimited by 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 one 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)

Abstract

Un éjecteur à fente (1) comprend une paroi postérieure (6), dans le sens de déplacement de la toile (3), avec deux parties (8 et 9) horizontalement mobiles. La partie supérieure (8) est fixe dans la position de fonctionnement, alors que la partie inférieure (9), qui fait face à la toile, forme un diaphragme qui s'étend le long de la partie supérieure, la recouvrant partiellement, et peut se déplacer de manière réglable par rapport à cette dernière, aussi bien dans la direction de la toile (3) qu'en direction opposée, de manière à s'éloigner de la toile. Dans chaque position réglée, la partie (9) est élastiquement soutenue sur la partie supérieure fixe (8) dans la direction de la toile (3). Un servomoteur (9) agencé entre la partie inférieure (9) et la partie supérieure (8) sert à déplacer et à soutenir élastiquement la partie inférieure (9). L'invention concerne des agencements de cet éjecteur à fente (1) dans une machine à papier à deux toiles.
PCT/DE1991/000611 1990-09-05 1991-07-30 Ejecteur a fente, notamment pour machines a papier a deux toiles WO1992004500A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59107409T DE59107409D1 (de) 1990-09-05 1991-07-30 Schlitzdüse, insbesondere für einen doppelsiebformer
EP91913352A EP0497932B1 (fr) 1990-09-05 1991-07-30 Ejecteur a fente, notamment pour machines a papier a deux toiles
FI921813A FI97306C (fi) 1990-09-05 1992-04-23 Paperi- tai kartonkikoneen kaksoisviiraformeri

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4028126.4 1990-09-05
DE4028126A DE4028126C2 (de) 1990-09-05 1990-09-05 Schlitzdüse, insbesondere für einen Doppelsiebformer und deren Verwendung in einem Doppelsiebformer

Publications (1)

Publication Number Publication Date
WO1992004500A1 true WO1992004500A1 (fr) 1992-03-19

Family

ID=6413634

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1991/000611 WO1992004500A1 (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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000077298A1 (fr) * 1999-06-14 2000-12-21 Metso Paper, Inc. Procede permettant d'eliminer l'eau de la partie toile d'un sechoir de pulpe et d'un unite d'essorage
US6982025B2 (en) 2000-12-15 2006-01-03 Astenjohnson, Inc. Adjustable resilient blade support
US6984291B2 (en) 2000-12-15 2006-01-10 Astenjohnson, Inc. Vacuum box with skimmer blade

Families Citing this family (4)

* 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 Papiermasch Gmbh Siebpartie einer Papiermaschine
DE19651241A1 (de) * 1996-12-10 1998-06-18 Voith Sulzer Papiermasch Gmbh Doppelsieb-Blattbildungseinrichtung
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174120A (en) * 1985-04-26 1986-10-29 Doerries Gmbh Twin wire guiding apparatus
EP0318107A1 (fr) * 1987-11-25 1989-05-31 Oy Tampella Ab Procédé pour la formation d'une bande fibreuse dans une machine à papier et appareil pour l'application du procédé
EP0373133A2 (fr) * 1988-12-01 1990-06-13 Valmet Paper Machinery Inc. Procédé et dispositif de formation d'une feuille continue de papier ou de carton
DE3842155A1 (de) * 1988-12-15 1990-06-21 Voith Gmbh J M Doppelsiebformer zur herstellung einer papierbahn
EP0296135B1 (fr) * 1987-06-18 1990-10-03 Valmet Paper Machinery Inc. Section de formage d'une machine à papier à double toile

Family Cites Families (3)

* 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
GB8710428D0 (en) * 1987-05-01 1987-06-03 Beloit Corp Multi-ply web forming apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174120A (en) * 1985-04-26 1986-10-29 Doerries Gmbh Twin wire guiding apparatus
EP0296135B1 (fr) * 1987-06-18 1990-10-03 Valmet Paper Machinery Inc. Section de formage d'une machine à papier à double toile
EP0318107A1 (fr) * 1987-11-25 1989-05-31 Oy Tampella Ab Procédé pour la formation d'une bande fibreuse dans une machine à papier et appareil pour l'application du procédé
EP0373133A2 (fr) * 1988-12-01 1990-06-13 Valmet Paper Machinery Inc. Procédé et dispositif de formation d'une feuille continue de papier ou de carton
DE3842155A1 (de) * 1988-12-15 1990-06-21 Voith Gmbh J M Doppelsiebformer zur herstellung einer papierbahn

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000077298A1 (fr) * 1999-06-14 2000-12-21 Metso Paper, Inc. Procede permettant d'eliminer l'eau de la partie toile d'un sechoir de pulpe et d'un unite d'essorage
US6982025B2 (en) 2000-12-15 2006-01-03 Astenjohnson, Inc. Adjustable resilient blade support
US6984291B2 (en) 2000-12-15 2006-01-10 Astenjohnson, Inc. Vacuum box with skimmer blade

Also Published As

Publication number Publication date
EP0497932A1 (fr) 1992-08-12
DE59107409D1 (de) 1996-03-28
FI97306C (fi) 1996-11-25
CA2050647A1 (fr) 1992-03-13
FI97306B (fi) 1996-08-15
ATE134233T1 (de) 1996-02-15
EP0497932B1 (fr) 1996-02-14
FI921813A (fi) 1992-04-23
DE4028126C2 (de) 1993-10-14
FI921813A0 (fi) 1992-04-23
DE4028126A1 (de) 1992-03-19

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