EP0712454B1 - Formeur a deux toiles dans une machine a papier - Google Patents

Formeur a deux toiles dans une machine a papier Download PDF

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Publication number
EP0712454B1
EP0712454B1 EP95920084A EP95920084A EP0712454B1 EP 0712454 B1 EP0712454 B1 EP 0712454B1 EP 95920084 A EP95920084 A EP 95920084A EP 95920084 A EP95920084 A EP 95920084A EP 0712454 B1 EP0712454 B1 EP 0712454B1
Authority
EP
European Patent Office
Prior art keywords
forming
rib
wire
roll
gap
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
EP95920084A
Other languages
German (de)
English (en)
Other versions
EP0712454A1 (fr
Inventor
Pekka Eväsoja
Antti Poikolainen
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.)
Metso Paper Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP0712454A1 publication Critical patent/EP0712454A1/fr
Application granted granted Critical
Publication of EP0712454B1 publication Critical patent/EP0712454B1/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
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines

Definitions

  • the invention concerns a gap former in a paper machine, comprising a twin-wire zone, according to the pre-characterizing clause of claim 1.
  • the pulp suspension is passed from the headbox into a gap formed by a forming roll and by two wires, after which gap the two wires and the pulp layer placed between them follow the curve form of the forming roll, most of the water being drained through the wires.
  • the necessary dewatering pressure is produced by means of the tension of the outer wire, which tension produces a pressure in the pulp layer, which pressure is proportional to the wire tension and inversely proportional to the curve radius of the forming roll.
  • part of the kinetic energy of the pulp jet is converted to pressure energy, and the jet speed is lowered accordingly.
  • the dewatering through the outer wire away from the forming roll is intensified by the centrifugal force. Dewatering towards the forming roll can be intensified by means of negative pressure in a zone of the forming roll.
  • the gap former according to the present invention is characterized in that the free run of the forming wires from the forming roll to the first forming rib is substantially little and less than 200 mm and in that the first forming rib of the forming shoe or a forming-rib construction composed of two or more interconnected forming ribs, which are the first forming ribs of the forming shoe, is mounted resiliently and is loaded adjustably.
  • the principal idea of the invention i.e. that the first or the first two forming ribs are mounted on the former resiliently, provides the significant advantage that said forming, rib (or ribs) can be brought very close to the forming roll, even so that the first forming rib can be placed facing the forming roll, in which case there is no free distance between the forming roll and the first forming rib. This improves the stability of the wires and the runnability of the former in different running situations to a substantial extent.
  • first forming, rib is mounted resiliently, it is also loaded adjustably, thereby permiting running with a number of grammages, thicknesses, etc.
  • first forming, rib is mounted resiliently in accordance with the present invention, if is placed automatically in the correct position when the layer thickness is changed.
  • the solution in accordance with the present invention is particularly usable for different grades of fine paper.
  • the deflector rib of the MB-unit can be placed facing the resilient ribbed forming, shoe to improve the draining. In such a case, the deflector rib does not have to be loaded or adjustable, but it may be stationary.
  • Figure 1 is a schematic side view of a gap former in accordance with the invention.
  • Figure 2 shows an enlarged detail of the gap former as shown in Fig. 1 from the area of the forming roll, and a forming-rib construction.
  • Figure 3 is a schematic sectional view of the installation of the resilient forming rib in relation to the forming roll.
  • the former shown in Fig. 1 is a so-called gap former, in which the slice part 31 of the headbox 30 feeds a pulp suspension jet into the forming gap G between the forming wires 10,20.
  • the geometry of said forming gap G is determined from above by the forming roll 11 and from below by the breast roll 21, which guides the second forming wire 20, i.e., in the illustration in Fig. 1, the lower wire.
  • the forming roll 11 is followed by the MB-unit 40.
  • the breast roll 21 has been arranged so that its position can be regulated in the direction of the arrow E, i.e., in the exemplifying embodiment shown in Fig. 1, substantially in the vertical direction.
  • the geometry of the forming gap G is preferably such that, on the forming roll 11, the forming wires 10.20 have a common curve sector ⁇ .
  • the first forming wire 10 has been formed into a wire loop by means of the forming roll 11 and the guide rolls 14, and, as was already stated above, inside said loop of the first forming wire 10, the MB-unit 40 is fitted.
  • the MB-unit 40 comprises two draining chambers 41,42, in which a vacuum has been arranged to be effective.
  • Each draining chamber 41,42 is provided with a drain duct 43,44, through which the water that has been passed into the draining chamber 41,42 with the aid of said vacuum is drained away from the draining chamber.
  • the water enters along the deflector duct 12,13.
  • the deflector rib 12a As is shown in connection with the first deflector duct 12. at the lower end of said deflector duct 12, there is a deflector rib 12a placed against the first forming wire 10.
  • the deflector rib 12a defines said deflector duct 12, and the water, which is guided by the deflector rib 12a, is drained through the first forming wire 10 along the first deflector duct 12 into the first draining chamber 41.
  • the second forming wire 20 has been formed into a wire loop by means of the breast roll 21 and the guide rolls 21a.
  • a first forming rib 22a of a forming shoe is arranged, which is placed against the second forming wire 20 and which is followed by a number of forming ribs 23, which are placed at a distance from one another and which have been arranged as a set of ribs or as a ribbed deck.
  • the set of ribs or the ribbed deck has been integrated as a common box 24, which can be subjected to a vacuum if necessary, by means of which vacuum the draining through the second forming wire 20 is intensified.
  • the first set of ribs or the ribbed deck is substantially straight or slightly curved.
  • a second set or ribs 25 or an equivalent ribbed deck which is fitted inside the loop of the second forming wire 20 and which has been integrated similarly as a box 26.
  • the open ribbed deck of the second set of ribs 25 has been formed as curved so that, owing to this curve form, a compression is applied to the stock web running between the wires 10,20. whereby this compression, together with the centrifugal force produced by the curve form of the ribbed deck 25, produces draining of water out of the stock web through the first forming wire 10.
  • This water that has been drained out of the stock is passed along the second deflector duct 13 into the second draining chamber 42, being aided by a vacuum that is preferably effective in said chamber 42.
  • the draining is intensified and promoted further by the deflector rib (not shown) placed in the lower part of the second deflector duct 13.
  • suction boxes 27 are provided with a ribbed deck and by whose means draining of water out of the stock web through the second forming wire 20 is produced, and by means of which suction boxes 27 it is achieved at the same time that the stock web follows along with the second forming wire 20 as the runs of the wires 10,20 are separated from one another.
  • the suction boxes 27 there follows the second forming roll 28, which is provided with a suction zone 29 for further removal of water out of the stock web and so as to guarantee that the stock web remains on the second forming wire 20.
  • Fig. 2 shows an enlarged detail of the former as shown in Fig. 1 from the area of the forming gap G and of a forming-rib construction 22.
  • the forming-rib construction 22 comprises the first forming rib 22a and a successive second forming rib 22b which are interconnected by means of a fastening member 22c.
  • This forming-rib construction 22 is supported on the frame 22d of the former or the box 24 by means of adjustable loading members, preferably loading hoses 22e, so that, by feeding a pressure medium into these loading hoses 22e in the desired way, the forming-rib construction 22 can be made to be positioned in the desired position in relation to the wires 10,20 and to the forming roll 11.
  • the installation of the forming-rib construction 22 is resilient, in which case the ribs 22a,22b are placed automatically in the correct position if, for example, the thickness of the pulp suspension layer fed into the forming gap G is changed.
  • the pressure of the pressure medium in the loading hoses 22e can be regulated even during running. Besides the possibility of regulating the pressure of the ribs against the second forming wire 20 by means of the loading hoses 22e, by means of said loading hoses 22e it is also possible to regulate the angle of the ribs 22a,22b in relation to the forming wire 20.
  • the forming rib 22a in accordance with the invention can be placed fully facing the forming roll 11, in which case there is no such free distance a at all.
  • the elimination of this free distance improves the stability of the wires 10,20 and the runnability of the former in different running situations essentially.
  • the free run from the forming roll 11 to the first forming rib 22a is preferably in the range of 0...70 mm.
  • Such an adjustable, and resilient installation is particularly favourable when grades of fine paper are run, in which case the common curve sector ⁇ of the wires 10,20 on the forming roll 11 is very little and the streaks occurring in the fibre stock are more common than in cases in which a larger curve sector ⁇ is used.
  • the forming-rib construction 22 whose position can be adjusted can be pulled apart from the forming wire 20 when the machine is being started or run down. Also otherwise, if necessary, the forming-rib construction 22 can be pulled apart from the wire 20.

Landscapes

  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Making Paper Articles (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Claims (9)

  1. Dispositif de formage à interstice dans une machine à papier, comprenant une zone à deux toiles, qui est constituée par une boucle d'une première toile de formage (10) et d'une boucle d'une seconde toile de formage (20) et s'étend à partir d'un interstice de formage (G), dans lequel une partie formant règle (31) d'une boíte de tête (30) introduit un jet de suspension de pâte mécanique, lequel interstice de formage (G) est défini, d'un côté, par la première toile de formage (10), qui circule sur un rouleau de formage (11) et, sur le côté opposé, par un brin sensiblement rectiligne de la seconde toile de formage (20) qui s'étend depuis un rouleau de tête (21) jusqu'au rouleau de formage (11), un équipement de drainage (40 ... 44) monté à l'intérieur de la boucle de la première toile de formage (10) en aval du rouleau de formage (11), lequel équipement de drainage est pourvu d'un conduit de déviation (12) et d'une nervure de déviation (12a) placée contre la première toile de formage (10) au niveau de la partie inférieure dudit conduit de déviation (12), et un sabot de formage disposé à l'intérieur de la boucle du second fil (20), lequel sabot de formage est pourvu d'un couvercle nervuré constitué par des nervures de formage (22a, 22b, 23) et qui est serré contre la seconde toile de formage (20), caractérisé en ce que le brin libre des toiles de formage (10, 20), qui s'étend depuis le rouleau de formage (11) jusqu'à la première rainure de formage (22a) du sabot de formage, est essentiellement petit et d'une taille inférieure à 200 mm et en ce que la première nervure de formage (22a) ou une structure (22) à nervures de formage, constituée de deux ou de plusieurs nervures de formage interconnectées (22a, 22b), qui sont les premières nervures de formage du sabot de formage, est montée élastiquement et chargée de manière à pouvoir être ajustée.
  2. Dispositif de formage à interstice selon la revendication 1, caractérisé en ce que la première nervure de formage (22a) ou la structure (22) à nervures de formage est montée de telle sorte que ladite nervure de formage (22a) ou ladite structure (22) à nervures de formage peut être écartée de la seconde toile de formage (20).
  3. Dispositif de formage à interstice selon la revendication 1 ou 2, caractérisé en ce que la première nervure de formage (22a) est montée, dans la direction de trajet des toiles de formage (10, 20) sensiblement au point où les toiles de formage (10, 20) s'écartent du rouleau de formage (11) à la fin de leur secteur courbe commun (α).
  4. Dispositif de formage à interstice selon la revendication 1 ou 2, caractérisé en ce que la première nervure de formage (22a) ou la structure (22) à nervures de formage est montée essentiellement en étant tournée vers la nervures de déviation (12a), qui est disposée directement en aval du rouleau de formage (11).
  5. Dispositif de formage à interstice selon l'une quelconque des revendications précédentes, caractérisé en ce que la première nervure de formage (22a) ou la structure (22) à nervures de formage est repoussée contre la seconde toile de formage (20) au moyen d'éléments de charge actionnés par un fluide sous pression, comme par exemple des tuyaux de charge (22e).
  6. Dispositif de formage à interstice selon la revendication 5, caractérisé en ce que la première nervure de formage (22a) ou la structure (22) à nervures de formage est chargée élastiquement au moyen d'un fluide pneumatique sous pression.
  7. Dispositif de formage à interstice selon la revendication 6, caractérisé en ce que la première nervure de formage (22a) ou la structure (22) à nervures de formage est chargée pneumatiquement de sorte que la nervure de formage (22a) ou la structure (22) à nervures de formage est montée de manière à être positionnée automatiquement en fonction de l'épaisseur de la couche de pâte mécanique fibreuse.
  8. Dispositif de formage à interstice selon l'une quelconque des revendications précédentes, caractérisé en ce que la circulation des toiles de formage (10, 20) depuis le rouleau de formage (11) jusqu'à la première nervure de formage (22a) est essentiellement nulle.
  9. Dispositif de formage à interstice selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le trajet des fils de formage (10, 20) entre le rouleau de formage (11) et la première nervure de formage (22a) se situe dans la gamme de 0 ... 70 mm.
EP95920084A 1994-06-15 1995-05-22 Formeur a deux toiles dans une machine a papier Expired - Lifetime EP0712454B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI942832A FI112509B (fi) 1994-06-15 1994-06-15 Paperikoneen kitaformeri
FI942832 1994-06-15
PCT/FI1995/000276 WO1995034713A1 (fr) 1994-06-15 1995-05-22 Appareil de formation de l'ouverture de calibrage sur une machine a papier

Publications (2)

Publication Number Publication Date
EP0712454A1 EP0712454A1 (fr) 1996-05-22
EP0712454B1 true EP0712454B1 (fr) 2001-10-17

Family

ID=8540921

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95920084A Expired - Lifetime EP0712454B1 (fr) 1994-06-15 1995-05-22 Formeur a deux toiles dans une machine a papier

Country Status (8)

Country Link
EP (1) EP0712454B1 (fr)
JP (1) JP3828148B2 (fr)
KR (1) KR100356281B1 (fr)
AT (1) ATE207154T1 (fr)
CA (1) CA2168119C (fr)
DE (1) DE69523257T2 (fr)
FI (1) FI112509B (fr)
WO (1) WO1995034713A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19828237A1 (de) 1998-06-25 1999-12-30 Voith Sulzer Papiertech Patent Doppelsiebformer
DE10327425A1 (de) * 2003-06-18 2005-01-05 Voith Paper Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn
EP3260802B1 (fr) * 2016-06-23 2019-10-09 Valmet Technologies Oy Buse pour un dispositif de traitement sans contact d'un voile de fibres
KR102236703B1 (ko) * 2020-07-17 2021-04-06 주식회사 아진피앤피 제지생산설비 초지공정의 지필형성부 구조체

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4002304A1 (de) * 1990-01-26 1991-08-14 Escher Wyss Gmbh Former in einer papiermaschine
DE4026953C2 (de) * 1990-01-26 1995-11-30 Escher Wyss Gmbh Entwässerungsvorrichtung und Verfahren zur Entwässerung an einem Doppelsiebformer

Also Published As

Publication number Publication date
WO1995034713A1 (fr) 1995-12-21
FI942832A (fi) 1995-12-16
FI942832A0 (fi) 1994-06-15
CA2168119A1 (fr) 1995-12-21
FI112509B (fi) 2003-12-15
EP0712454A1 (fr) 1996-05-22
KR100356281B1 (ko) 2003-02-11
ATE207154T1 (de) 2001-11-15
CA2168119C (fr) 2007-03-27
JP3828148B2 (ja) 2006-10-04
DE69523257T2 (de) 2002-06-27
JPH09504060A (ja) 1997-04-22
DE69523257D1 (de) 2001-11-22
KR960704112A (ko) 1996-08-31

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