EP0122701A1 - Entwässerungsgeräte - Google Patents

Entwässerungsgeräte Download PDF

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Publication number
EP0122701A1
EP0122701A1 EP84301198A EP84301198A EP0122701A1 EP 0122701 A1 EP0122701 A1 EP 0122701A1 EP 84301198 A EP84301198 A EP 84301198A EP 84301198 A EP84301198 A EP 84301198A EP 0122701 A1 EP0122701 A1 EP 0122701A1
Authority
EP
European Patent Office
Prior art keywords
active surface
radius
curvature
fibrous suspension
dewatering
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
EP84301198A
Other languages
English (en)
French (fr)
Other versions
EP0122701B1 (de
Inventor
Ronnie Abraham Arav
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.)
Beloit Walmsley Ltd
Original Assignee
Beloit Walmsley Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10539761&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0122701(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Beloit Walmsley Ltd filed Critical Beloit Walmsley Ltd
Publication of EP0122701A1 publication Critical patent/EP0122701A1/de
Application granted granted Critical
Publication of EP0122701B1 publication Critical patent/EP0122701B1/de
Expired 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • 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

Definitions

  • the present invention relates to apparatus for dewatering a fibrous stock and in particular for dewatering a fibrous web formed between top and bottom wires of a paper forming machine.
  • a web is formed between top and bottom forming wires and water is extracted in an upward direction by suction by a so- called inverted vacuum box.
  • the vacuum box has a cover whose surface contacting the top wire is open to vacuum.
  • the openings in the cover are in the form of slots and/or drilled openings.
  • the first part of the cover after the auto-slice has slots and a later part has holes.
  • the cover has a constant radius of curvature.
  • An aim of the present invention is to increase the drainage capabilities-of the curved inverted vacuum box without detracting from its-paper-forming qualities.
  • apparatus for dewatering a fibrous suspension on a paper forming machine comprising a suction housing having an active surface adapted to contact a travelling forming wire of the paper machine, said active surface being curved convexly, with the radius of curvature of the active surface upstream being greater than the radius of curvature downstream.
  • the radius.of curvature of the cover decreases progressively in the downstream direction, i.e. in the direction of travel of the wire.
  • the cover has a compound curvature.
  • the cover may be composed of two or more constant radially curved sections, having different radii.
  • the suction housing is preferably an inverted suction box in which water is extracted upwardly from the web which is constrained between top and bottom forming wires.
  • the suction housing is preferably an inverted suction box in which water is extracted upwardly from the web which is constrained between top and bottom forming wires.
  • a method of dewatering a fibrous suspension on a paper forming machine comprising applying suction and pressure to the fibrous suspension by contacting a travelling forming wire of the paper forming machine with a convexly curved active surface of a suction housing wherein the pressure exerted on the fibrous suspension over the length of the active surface is greater downstream than upstream.
  • the pressure is inversely proportional to the radius of the active surface and may increase incrementally or progressively over the length of the active surface.
  • the initial large radius gives the same high quality formation of the present large radius, but has the advantage that the higher pressures applied later in the dewatering process increase the drainage capabilities of the cover.
  • an endless top wire 1 is entrained around rollers 3 and is co-operable with a bottom forming wire 5 of a paper forming machine.
  • the wires 5 and 1 move in the direction indicated by the respective arrows A and B.
  • the fibrous suspension is deposited on the forming wire 5.
  • Suction apparatus in the form of a curved inverted vacuum box 7 is disposed within the endless top wire 1 and has an active surface 9 which contacts the top wire 1.
  • the active surface 9 is open to vacuum and may comprise a plurality of bars defining slots, or holes drilled in a plate.
  • the suspension is dewatered upwardly in the illustrated embodiment.
  • the active surface is curved convexly and according to one aspect of the present invention the radius of curvature of the active surface or cover is not constant throughout but decreases in the direction of wire movement. Preferably, the radius of curvature decreases progressively in the downstream direction.
  • a lead in foil 11 is provided, and a transfer box 13.
  • the radii will be tangent to each other to define a compound curvature composed of decreasing radii.
  • the pressure between the two wires .1, 5 on the curved inverted suction box is inversely proportional to the radius of curvature.
  • the bone dry moisture of the stock, after the compound cover will be higher than from a cover with uniform radius. Additionally, due to the increased drainage capacity, more water will flow through the cover -apertures and this increased flow flushes the internal passageways and clears up all stock build-ups. Thus, the.tendency for the final part of the cover to plug up is reduced.

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  • Paper (AREA)
EP84301198A 1983-03-17 1984-02-24 Entwässerungsgeräte Expired EP0122701B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8307435 1983-03-17
GB838307435A GB8307435D0 (en) 1983-03-17 1983-03-17 Dewatering apparatus

Publications (2)

Publication Number Publication Date
EP0122701A1 true EP0122701A1 (de) 1984-10-24
EP0122701B1 EP0122701B1 (de) 1987-06-03

Family

ID=10539761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84301198A Expired EP0122701B1 (de) 1983-03-17 1984-02-24 Entwässerungsgeräte

Country Status (6)

Country Link
EP (1) EP0122701B1 (de)
DE (1) DE3464073D1 (de)
FI (1) FI79729C (de)
GB (1) GB8307435D0 (de)
PL (1) PL143764B1 (de)
ZA (1) ZA841486B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995011338A1 (en) * 1993-10-16 1995-04-27 Beloit Technologies, Inc. A forming apparatus for forming a web from stock
WO1998048111A1 (en) * 1997-04-22 1998-10-29 Beloit Technologies, Inc. A forming apparatus for forming a web
WO2011000614A1 (de) 2009-07-02 2011-01-06 Voith Patent Gmbh Formiereinheit und verfahren zur herstellung einer materialbahn

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2289671A1 (fr) * 1974-10-25 1976-05-28 Valmet Oy Perfectionnements aux sections de formation de la feuille des machines a papier mousseline
FR2350422A1 (fr) * 1976-05-04 1977-12-02 Australian Paper Manufacturers Perfectionnements a l'elimination de l'eau de suspensions de fibres
DE3315023A1 (de) * 1982-04-30 1983-11-10 Valmet Oy, 00130 Helsinki Formschuh fuer den former einer papiermaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2289671A1 (fr) * 1974-10-25 1976-05-28 Valmet Oy Perfectionnements aux sections de formation de la feuille des machines a papier mousseline
FR2350422A1 (fr) * 1976-05-04 1977-12-02 Australian Paper Manufacturers Perfectionnements a l'elimination de l'eau de suspensions de fibres
DE3315023A1 (de) * 1982-04-30 1983-11-10 Valmet Oy, 00130 Helsinki Formschuh fuer den former einer papiermaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995011338A1 (en) * 1993-10-16 1995-04-27 Beloit Technologies, Inc. A forming apparatus for forming a web from stock
WO1998048111A1 (en) * 1997-04-22 1998-10-29 Beloit Technologies, Inc. A forming apparatus for forming a web
WO2011000614A1 (de) 2009-07-02 2011-01-06 Voith Patent Gmbh Formiereinheit und verfahren zur herstellung einer materialbahn

Also Published As

Publication number Publication date
FI79729C (fi) 1990-02-12
DE3464073D1 (en) 1987-07-09
EP0122701B1 (de) 1987-06-03
GB8307435D0 (en) 1983-04-27
ZA841486B (en) 1984-10-31
PL143764B1 (en) 1988-03-31
FI840901A0 (fi) 1984-03-07
PL246711A1 (en) 1984-11-08
FI840901A (fi) 1984-09-18
FI79729B (fi) 1989-10-31

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