EP0122702B2 - Improvements in or relating to apparatus for dewatering fibrous suspensions on a paper forming machine - Google Patents

Improvements in or relating to apparatus for dewatering fibrous suspensions on a paper forming machine Download PDF

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Publication number
EP0122702B2
EP0122702B2 EP84301199A EP84301199A EP0122702B2 EP 0122702 B2 EP0122702 B2 EP 0122702B2 EP 84301199 A EP84301199 A EP 84301199A EP 84301199 A EP84301199 A EP 84301199A EP 0122702 B2 EP0122702 B2 EP 0122702B2
Authority
EP
European Patent Office
Prior art keywords
cover
wire
water
fibrous suspension
open area
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
EP84301199A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0122702B1 (en
EP0122702A1 (en
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=10539762&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0122702(B2) "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 EP0122702A1 publication Critical patent/EP0122702A1/en
Publication of EP0122702B1 publication Critical patent/EP0122702B1/en
Application granted granted Critical
Publication of EP0122702B2 publication Critical patent/EP0122702B2/en
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

Definitions

  • the present invention relates to apparatus for dewatering fibrous suspensions on a paper forming machine.
  • the fibrous suspension passes between top and bottom forming wires and water is extracted from the suspension in an upward direction by use of an auto-slice and a curved inverted suction box which contacts the top wire.
  • the two wires trap the stock over a lead-in-foil and water flows in an upward direction into the auto-slice and afterwards, due to the continuing pressure of the two wires, the dewatering action is continued in an upward direction into the apertures of the inverted suction box (FR-A-2350422).
  • a transfer suction box is disposed downstream of the inverted suction box on the side of the bottom wire and vacuum applied to the suction box reverses the direction of flow and a downward dewatering action takes place together with the transfer of stock to the bottom wire.
  • the cover has a typical radius of five metres and its contacting surface with the top wire is open to vacuum.
  • the openings in the cover are in the form of slots or drilled holes. The arrangement is such as to produce upward dewatering throughout its whole length.
  • apparatus for dewatering a fibrous suspension on a paper forming machine comprising a suction housing having an active surface or cover adapted to co-operate with a top wire to urge that wire towards a forming wire, the fibrous suspension being trapped between the top wire and the forming wire, and the cover having a first open area by means of which the water is removed upwardly and a second solid part downstream of the first open area which urges the water downwardly.
  • the first open area comprises a plurality of slots or foils defining slots or a plurality of of drilled holes.
  • the open area in the first part of the cover may be reduced in the downstream direction.
  • the solid part of the cover will not permit any dewatering to take place through the cover and, consequently, the pressure of the two wires will force the dewatering action to reverse its direction and go downwards.
  • a method of dewatering a fibrous suspension on a paper forming machine in which a fibrous suspension trapped between a top wire and a bottom forming wire is moved past an active surface or cover of a suction housing with the top wire contacting the cover for the purpose of removing water from the fibrous suspension, wherein the water is extracted in an upward direction as the fibrous suspension moves past a first open area of the cover, and wherein the water is directed downwardly as the fibrous suspension moves past a second solid part of the cover disposed downstream of the first area.
  • the machine comprises an endless top-wire 1 which is entrained around rolls 3.
  • Dewatering apparatus in the form of a curved inverted vacuum box having a suction housing 7 is disposed within the top-wire 1 and has an active surface or cover 9 which co-operates with the top--wire 1.
  • the cover 9 urges the top-wire 1 towards a forming wire 5.
  • the fibrous suspension is trapped between the top-wire 1 and the forming wire 5.
  • the wires 1, 5 move in the direction indicated by arrows A.
  • the forming wire 5 passes over a lead-in foil 11 which urges water upwardly.
  • An auto-slice 13 immediately downstream of the lead-in-foil removes a proportion of the water in the upward direction.
  • a further portion of the water is removed upwardly by a first part of the cover 9 which has an open area and to which suction is applied from the suction housing.
  • the open area extends over the region shown at 15 and is formed by a plurality of foils defining slots or by drilled holes.
  • the open area may have a compound curvature with a radius which decreases in the downstream direction in order to generate a progressively higher dewatering pressure.
  • a second part of the cover, generally indicated at 17, is solid. Thus, no dewatering can take place through the cover in this part and, consequently, the pressure of the two wires will force the dewatering action to reverse its direction and go downwards.
  • the dewatering apparatus of the present invention has the following disadvantages:-
  • the retention of the Bel Bond will improve.
  • the water coming down from the second part of the vacuum box will lubricate the transverse box cover and contribute to a longer suction box cover life.

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  • Paper (AREA)
EP84301199A 1983-03-17 1984-02-24 Improvements in or relating to apparatus for dewatering fibrous suspensions on a paper forming machine Expired - Lifetime EP0122702B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8307437 1983-03-17
GB838307437A GB8307437D0 (en) 1983-03-17 1983-03-17 Apparatus for dewatering fibrous suspensions on paper forming machine

Publications (3)

Publication Number Publication Date
EP0122702A1 EP0122702A1 (en) 1984-10-24
EP0122702B1 EP0122702B1 (en) 1986-07-30
EP0122702B2 true EP0122702B2 (en) 1990-03-14

Family

ID=10539762

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84301199A Expired - Lifetime EP0122702B2 (en) 1983-03-17 1984-02-24 Improvements in or relating to apparatus for dewatering fibrous suspensions on a paper forming machine

Country Status (6)

Country Link
EP (1) EP0122702B2 (fi)
DE (1) DE3460372D1 (fi)
FI (1) FI79730C (fi)
GB (1) GB8307437D0 (fi)
PL (1) PL143765B1 (fi)
ZA (1) ZA841487B (fi)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1201808B (it) * 1986-09-05 1989-02-02 Awe Anti Wear Eng Srl Procedimento di disidratazione della pasta per carta e contemporanea formazione del foglio in un sistema a doppia tela ed impianto adottante tale procedimento
ES2025734T3 (es) * 1988-06-16 1992-04-01 Gustav Reinhard Gmbh & Co. Kg Unidad de drenaje de agua para maquina de hacer papel de criba longitudinal.
FI98540C (fi) * 1989-05-08 1997-07-10 Valmet Corp Laite paperi- tai kartonkirainan muodostamiseksi kuitumateriaalista
EP0429621A1 (de) * 1989-06-21 1991-06-05 GUSTAV REINHARD GMBH & CO. KG Verfahren zur entwässerung eines wasserhaltigen faservlieses auf langsieb-papiermaschinen und zugehörige entwässerungseinheit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI313874A7 (fi) * 1974-10-25 1976-04-26 Valmet Oy
GB1582342A (en) * 1976-05-04 1981-01-07 Beloit Walmsley Ltd Dewatering of fibrous suspensions
FI70739C (fi) * 1977-04-28 1986-10-06 Valmet Oy Banbildningsenhet vid framstaellning av flerskiktskartong
FI75376C (fi) * 1982-04-30 1988-06-09 Valmet Oy Formningssko foer formare i pappersmaskin.

Also Published As

Publication number Publication date
FI840902A0 (fi) 1984-03-07
DE3460372D1 (en) 1986-09-04
FI840902L (fi) 1984-09-18
GB8307437D0 (en) 1983-04-27
FI79730B (fi) 1989-10-31
EP0122702B1 (en) 1986-07-30
PL246712A1 (en) 1984-11-08
EP0122702A1 (en) 1984-10-24
FI79730C (fi) 1990-02-12
ZA841487B (en) 1984-10-31
PL143765B1 (en) 1988-03-31

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