EP0627524B1 - Section de formage dans une machine à papier - Google Patents

Section de formage dans une machine à papier Download PDF

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Publication number
EP0627524B1
EP0627524B1 EP94850086A EP94850086A EP0627524B1 EP 0627524 B1 EP0627524 B1 EP 0627524B1 EP 94850086 A EP94850086 A EP 94850086A EP 94850086 A EP94850086 A EP 94850086A EP 0627524 B1 EP0627524 B1 EP 0627524B1
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EP
European Patent Office
Prior art keywords
wire
dewatering
twin
zone
web
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
EP94850086A
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German (de)
English (en)
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EP0627524A1 (fr
Inventor
Jyrki Jaakkola
Seppo Kiviranta
Ari Linsuri
Michael Odell
Antti Poikolainen
Samppa Salminen
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Valmet Oy
Original Assignee
Valmet Oy
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Publication of EP0627524A1 publication Critical patent/EP0627524A1/fr
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Publication of EP0627524B1 publication Critical patent/EP0627524B1/fr
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    • 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus

Definitions

  • the invention concerns a web former in a paper machine comprising a twin-wire zone formed by guiding a looped upper wire over a looped lower wire, wherein the web former comprises an initial, preferably substantially horizontal, single-wire portion preceding the twin-wire zone and being formed in connection with the looped lower wire, onto which initial single-wire portion a pulp jet is fed, the pulp jet being alternatively fed directly into a gap formed between the upper and lower wire loops with no initial single-wire portion in which case the twin-wire zone comprises an initial portion formed in connection with a forming roll over which the twin-wire zone is curved so that water is drained primarily through the lower wire loop.
  • the web former comprises an upper-wire unit, in which there is an upper wire guided by guide and web-forming rolls, which upper wire, together with the run of the lower wire, forms a twin-wire dewatering zone, which starts at the first forming roll, which is placed inside the loop of the upper wire and is provided with an open hollow face.
  • a forming shoe which has a curved deck that guides the lower-wire loop and whose curve centres or centre are/is placed at the side of the lower-wire loop.
  • a forming roll which guides the twin-wire forming zone and on whose guide sector the run of the twin-wire forming zone is curved downwards.
  • the dewatering takes place primarily upwards through the upper wire, after which the dewatering pressure is increased further in the area of the second forming roll, while the dewatering still takes place primarily through the upper wire.
  • the object of the present invention is further development of the applications of the prior-art MB units as well as to provide novel advantageous combinations of said MB units and of hybrid formers.
  • a particular object of the invention is further development of the formers described in said FI Patent 75,375 and of corresponding "Sym-Former” and “Sym-Former R” formers so that their running speeds can be increased, e.g. in connection with modernizations, to a considerably higher level, typically to a speed range of 1200...1500 metres per minute, so that neither the dewatering capacity nor the formation of the web accomplished in the former constitutes an obstacle for an increased speed.
  • the web former according to the invention is mainly characterized by the features recited in claim 1 of the two appended sets of claims. Further features of the web former are defined in the dependent claims.
  • EP-A-0 552 139 which falls within the terms of Article 54(3) EPC for the designated contracting states AT, DE, FR, GB, IT and SE, discloses a hybrid former according to claim 1 of the set of claims for the designated contracting states CH and LI.
  • the MB zone is preceded by a dewatering chamber fitted above the first forming shoe, and said chamber is directly followed by a second dewatering chamber fitted above the MB zone.
  • the waters are removed through drain ducts, which are preferably placed at the driving side of the machine only.
  • Said dewatering chambers are placed in the space between the first guide roll, placed inside the loop of the upper wire, and the first forming roll.
  • the twin-wire zone is curved after the MB zone upwards, whereupon there are preferably dewatering members in accordance with the "Sym-Former" concept, such as a second forming shoe and a second forming roll placed inside the loop of the lower wire.
  • the hybrid former shown in Figs. 1 and 2 comprises a lower wire 20 guided by the guide rolls 21.
  • the pulp suspension jet J is fed out of the discharge opening 53 of the headbox onto the single-wire initial portion 20a of the lower wire 20.
  • the paper web W 0 that is formed on this initial portion 20a has time to reach a certain degree of couching on its face placed against the lower wire 20 before the twin-wire zone starts.
  • the run of the lower wire 20 is guided outside the twin-wire zone by the breast roll 21a and by the guide rolls 21.
  • Fig. 1 shows the frame part 65 placed inside the loop of the lower wire 20, which frame is, for example, a part of the frame of an existing Fourdrinier wire part, which has been modernized to make a twin-wire hybrid former in accordance with the invention.
  • the former includes an upper-wire unit 60, which includes the frame part 61.
  • the twin-wire forming zone starts at the first forming shoe 22 and ends at the guide roll 11c of the upper wire 10, after which the web W follows the lower wire 20.
  • the run of the upper wire is guided outside the twin-wire zone by the first guide roll 11a and by the latter guide roll 11c as well as by the upper guide rolls 11d.
  • the guide roll 11a of the upper wire 10 guides the upper wire onto the web W in the area of the ribbed deck 22a of the first forming shoe 22, preferably approximately at its fourth rib when the ribbed deck 22a comprises about 7 ribs.
  • the ribbed deck 22a of the forming shoe 22, which is placed inside the loop of the lower wire 20, has a relatively large curve radius R 1 , which is, as a rule, dimensioned in the range of R 1 ⁇ 3...12 m, preferably in the range of R 1 ⁇ 5...8 m.
  • the dry solids content k 1 of the web W is, at the beginning of the twin-wire zone, of an order of k 1 ⁇ 1.0...3 %, preferably in the range of k 1 ⁇ 1.2...1.8 %.
  • the first forming shoe 22 is followed by a MB unit 100 fitted in accordance with the invention.
  • the MB unit 100 comprises a first dewatering chamber 12 fitted inside the loop of the upper wire 10 and, immediately after said chamber, a second dewatering chamber 13. Said chambers 12 and 13 communicate with a source 50 of negative pressure so that the negative pressures p 1 and p 2 present inside the chambers 12 and 13 can be set or adjusted individually.
  • the first chamber 12 is provided with a water drain duct 12f, which is preferably placed at the driving side of the machine only.
  • the second dewatering chamber 13 is provided with a corresponding water drain duct 13b.
  • the first chamber 12 is attached to the frame parts 61 of the upper-wire unit 60 by means of support members 12a, and similarly the second chamber 13 is attached to the frame parts 61 of the upper-wire unit 60 by means of its support members 13a, if necessary, so that its position can be set or adjusted.
  • a more detailed exemplifying embodiment of the twin-wire zone of the MB unit 100, which comes out from Figs. 3 and 4, will be described in more detail later.
  • the MB unit 100 which has been fitted in accordance with the invention, is followed by a "Sym-Former" twin-wire zone similar to what is known from the prior art.
  • the twin-wire zone is guided by the smooth-faced 14' forming roll 14, on whose sector a the twin-wire zone is curved upwards.
  • the magnitude of the sector a is, as a rule, chosen as a ⁇ 20°...45°.
  • a second forming shoe 24 follows, which has a ribbed deck 24a, which may communicate with negative pressure if necessary.
  • the curve radius R 2 of the ribbed deck 24a of the forming shoe 24 is, as a rule, chosen in the range of R 2 ⁇ 2...6 m.
  • the second forming shoe 24 is followed by a forming roll 25 placed inside the loop of the lower wire 20, the twin-wire zone being curved downwards on the sector b ⁇ 30°...50° of said forming roll 25.
  • the forming roll 25 is preferably smooth-faced 25' and has no suction zone.
  • the twin-wire zone runs as downwards inclined onto the guide or forming roll 11b placed inside the loop of the upper wire 10, which roll returns the twin-wire zone to the plane T-T determined by the single-wire initial portion 21 or to the proximity of said plane.
  • a pick-up device in itself known follows, which comprises a pick-up fabric 52 and a pick-up roll 51 provided with a suction zone 51a, on which roll the web W is separated from the lower wire 20 and is transferred into the press section of the paper machine (not shown).
  • the twin-wire MB zone starts after the last forming rib 22a 0 of the first forming shoe 22, being guided by the first pair of ribs 31a of the loading unit 23.
  • the twin-wire zone there follows the first fixed dewatering and guide rib 41a, which operates against the inner face of the upper-wire loop 10.
  • the first rib 41a is followed by equivalent dewatering and guide ribs 41 as uniformly spaced.
  • the last one of said ribs is denoted with the reference 41b.
  • pairs of loading ribs 31b and 31c operate, which are placed facing the gap spaces 41R between said dewatering and loading ribs and which are placed inside the lower-wire loop 20.
  • the width a 1 of the front face of the dewatering and guide ribs 41 in the machine direction is preferably measured in the range of a 1 ⁇ 50...60 mm
  • the width b 1 of the gap space between the ribs 31 and 41 in the machine direction, which space has no rubbing face is preferably dimensioned in the range of b 1 ⁇ 10...15 mm.
  • Said pairs of ribs 31b,31c as well as the first pair of loading ribs 31a that precedes them are connected in pairs, by means of connecting parts 35, to W-section loading members 34, in whose interior pairs of loading hoses 33 operate.
  • the pressure is regulated with which the pairs of loading ribs 31a,31b,31c are pressed against the inner face of the lower-wire loop 20.
  • the back-up supports for this loading consist of the dewatering and guide ribs 41a,41,41b, which are fixed.
  • the lower wall 12c of the first dewatering chamber 12 defines a gap space 12b above the ribbed deck 22a of the first forming shoe 22 and above the first pair of loading ribs 31a.
  • This gap space 12b water is drained that is derived mainly from the area of the ribbed deck 22a of the first forming shoe 22 as well as water that has been "doctored” by the first fixed dewatering and guide rib 41a from the inner face of the upper wire 10.
  • These waters are passed into the first dewatering box 12 in the direction of the arrow F 1 through the drain duct 16.
  • Said duct 16 is placed in the space between the rear wall 12c of the first chamber 12 and the vertical wall 13c of the second chamber 13.
  • Water is drained in the direction of the arrow F 2 through the gap spaces 41R between the ribs 41 along the duct 19 into the second chamber 13, being aided by the negative pressure p 2 present in said chamber.
  • the water is drained further out of the chamber 13 through its drain duct 13b, which is preferably placed at the driving side of the machine only.
  • a fixed pair of loading ribs 31d is placed in the loading unit 23, after said loading ribs 31c.
  • the twin-wire zone runs along a gently meandering path when loaded by the loading ribs 31 against the fixed ribs 41.
  • the ribs 31 and 41 which operate alternatingly against one another, apply dewatering impulses to the web W, which impulses improve the formation and produce dewatering, to some extent through the lower wire 20 and especially through the upper wire 10, if necessary, aided by negative pressures p 1 ,p 2 ,p 3 .
  • the ribs 31a,31b,31c,31d,41,41a,41b have been made as replaceable ribs that extend across the entire width of the wires 10,20, which ribs are either of a wear-resistant material, for example of a ceramic, throughout, or which ribs are provided with a wear-resistant front face, which operates against the inner faces of the wires 10,20, while the water drained out of the web W acts as a lubricant that reduces the wear and the friction.
  • the same also applies in respect of the ribs 22a and 24a in the decks of the forming shoes 22 and 24.
  • a preferred exemplifying embodiment will be described of the lower part of the drain duct 16 of the first dewatering chamber 12.
  • the dimensions and the shape of the throat K of the drain duct 16 of the chamber 12, placed at and above the first rib 41a, are highly critical depending on the amounts of water to be drained, on the speed of the machine, and on the paper grade produced.
  • attempts have been made to regulate the width of said throat K by adjusting the position of the first dewatering chamber 12 by means of various lifting mechanisms, but these devices are expensive, complicated, and they have not been able to provide a solution satisfactory under all circumstances, in particular not in respect of the shape of the throat K. According to Fig.
  • a replaceable form rib 17a which is preferably made of plastic.
  • Said rib 17a is fixed to a fastening base 12e provided in connection with the plane lower wall 12d of the first box 12 by means of the dovetail groove 17b in the rib 17a.
  • Said ribs 17a are made and kept in reserve as of different measures and different profile 17c of the outer face, so that, by replacing the ribs 17a, it is possible to set the width and the profile of the throat K in the draining direction F 1 and, if necessary, also in the transverse direction optimally.
  • the construction can be made operative with different machine speeds, both in slower machines, in which the water follows the face of the upper wire 10, and in machines of higher speeds, in which the water moving in the space 12b rises apart from the inner face of the upper wire 10.

Claims (10)

  1. Section de formage dans une machine à papier, ladite section de formage comprenant une zone à double toile obtenue en guidant une toile, supérieure (10), au tracé an boucle, au-dessus d'une toile intérieure (20) au tracé en boucle, laquelle zone à double toile débute dans la région ou à proximité de la couronne curviligne rainurée (22a) d'un patin de formage (22) logé à l'intérieur de la boucle de toile inférieure (20),
    ladite section de formage comprenant une partie initiale (20a) à toile unique, de préférence sensiblement horizontale, précédant la zone à double toile et formée en association avec la toile inférieure (20) au tracé an boucle, partie initiale (20a) à toile unique sur laquelle un jet de pâte (J) est déposé, le jet de pâte étant directement introduit, en variante, dans un interstice formé entre les toiles supérieure et inférieure, sans aucune partie initiale à toile unique, auquel cas la zone à double toile comprend une partie initiale formée an association avec un rouleau de formage sur lequel la zone à double toile est incurvée, de sorte que de l'eau est principalement évacuée à travers la boucle de toile inférieure,
    ladite section de formage comprenant en outre une unité de déshydratation (100) sollicitée par une pression, dans la région de ladite zone à double toile, ladite unité de déshydratation (300) sollicitée par pression comprenant :
    une première chambre de déshydratation (12) disposée au-dessus dudit patin de formage (22), à l'intérieur de la boucle de toile supérieure (10), et munie d'une paroi inférieure (12c) définissant un intervalle (12b) au-dessus de ladite couronne (22a), intervalle (12b) à travers lequel de l'eau, principalement drainée on provenance de la région de ladite couronne (22a), est évacuée et introduite dans la première chambre de déshydratation (12) en empruntant un conduit vertical (16) d'aspiration-déflexion,
    une seconde chambre de déshydratation (13) succédant à ladite première chambre de déshydratation (12) à l'intérieur de ladite boucle de toile supérieure (10),
    un ensemble de nervures (41a, 41, 41b), de déshydratation et de guidage, reliées à la partie inférieure de la seconde chambre de déshydratation (13), de l'eau étant évacuée à travers les intervalle (41R) entre lesdites nervures (41a, 41, 41b) de déshydratation et de guidage, et introduite dans la seconde chambre de déshydratation (13) en empruntant un conduit d'évacuation (19) s'ouvrant dans lesdits intervalles (41R), et
    une unité de charge (23) logée à l'intérieur de la boucle de toile intérieure (20), après le patin de formage (22), et dotée de nervures de charge (31a, 31b, 31c) qui sont pressées contre la toile inférieure (20), de préférence au moyen de flexibles do charge (33) dans lesquels un fluide prussurisé est admis, un ensemble desdites nervures de charge (31b, 31c) agissant contre ledit ensemble de nervures (41a, 41, 41b) de déshydratation et de guidage.
  2. Section de formage selon la revendication 1, caractérisée par le fait que la première nervure ou paire de nervures (31a) de l'unité de charge (23) est montée au-dessous de la première chambre de déshydratation (12), avant la première nervure (41a) de déshydratation et de guidage ; et par le fait que ladite première nervure (41a) do déshydratation et de guidage est fixe, et agit comme une nervure déflectrice au niveau du col (K) dans l'extrémité inférieure du conduit (16) d'aspiration-déflexion.
  3. Section de formage selon la revendication 1 ou 2, caractérisée par le fait que lesdites nervures (41a, 41, 41b) de déshydratation et de guidage sont toutes des nervures fixes; par le fait que de quatre à sept nervures de déshydratation et de guidage sont préférentiellement prévues ; et par la présence, après le dernière nervure (41b) dudit ensemble de nervures de déshydratation et de guidage, d'une ou de plusieurs nervure(s) fixe(s) de guidage (31b) logée(s) à l'intérieur de la boucle de toile inférieure (20) et fixée(s) à une partie du bâti de l'unité de charge (23).
  4. Section do formage selon l'une quelconque des revendications 1 à 3, caractérisée par le fait que chacune desdites première et seconde chambres de déshydratation (12, 13) communique avec une source (50) de pression négative, de sorte que la pression négative (p1, p2), régnant dans lesdites chambres de déshydratation (12, 13), peut être réglée et/ou régulée indépendamment ; et par le fait que lesdites chambres de déshydratation (12, 13) communiquent avec des seconds conduits d'évacuation (12f, 13b), de préférence uniquement sur le côté entraínement de la machine.
  5. Section de formage selon l'une quelconque des revendications 1 à 4, caractérisée par le fait que ledit patin de formage (22), et/ou un caisson de bâti de l'unité de charge (23), communique(nt) avec une source de pression négative (p0, p3).
  6. Section de formage selon l'une quelconque des revendications 1 à 5, caractérisée par le fait que la partie du col (K), située à l'extrémité inférieure du conduit (16) d'aspiration-déflexion, a été conçue de façon telle que son dimensionnement et/ou son profil puisse(nt) être ajusté(s), ladite partie de col étant pourvue d'une nervure profilée remplaçable (17a) qui constitue une paroi définissant ladite partie de col, majoritairement depuis le haut, de sorte que les cotes et la configuration de ladite partie de col (K) peuvent être réglées en remplaçant ladite nervure profilée (17a) par une nervure profilée différente, de manière à modifier les cotes et la forme de la face externe courbe (17c) de ladite nervure profilée.
  7. Section de formage selon la revendication 6, caractérisée par le fait que ladite nervure profilée remplaçable (17a) est rattachée à la face externe de la paroi inférieure de la première chambre de déshydratation (12), de préférence une paroi plane (12d), au moyen d'un assemblage par rainure et languette (12e, 17b) ou d'un assemblage à déclic équivalent.
  8. Section du formage selon l'une quelconque des revendications 1 à 7, caractérisée par la présence, avant la zone à double toile, d'une zone de formage (20a) à toile unique qui est, de préférence, sensiblement horizontale ; par le fait que la zone à double toile est incurvée vers le bas à partir du plan (T-T) de la partie initiale (20a) à toile unique, sur la couronne curviligne rainurée (22a) du patin de formage (22), et s'étend ensuite avec inclinaison vers le bas en étant guidée par la zone nervurée à sollicitation par pression de l'unité de déshydratation (100), après quoi se trouve, dans la zone à double toile, un rouleau de formage (14) logé à l'intérieur de la boucle de toile supérieure (10), préférentiellement muni d'une face (14') lisse et pleine, et sur lequel la zone à double toile est incurvée un un défilement incliné vers le haut, sur lequel un second patin de formage (24) est logé à l'intérieur de la boucle de toile inférieure (20), la zone à double toile étant incurvée dans la région de la couronne rainurée (24a) du second patin de formage (24) avec un fort rayon de courbure (R2), dans la direction opposée, comparativement à la zone courbe précédente (a) ; et par le fait que ledit second patin de formage (24) est suivi d'un second rouleau de formage (25) qui est logé à l'intérieur de la boucle de toile inférieure (20), et sur lequel la zone à double toile est incurvée en un défilement incliné vers le bas, avec un rayon de courbure (R3) considérablement plus petit que le rayon de courbure (R2) de la zone précédente.
  9. Section de formage selon la revendication 8, caractérisée par le fait que, après ledit second rouleau de formage (25), un rouleau (11b) de formage ou de guidage, logé à l'intérieur de la boucle de toile supérieure (10), guide la zone à double toile dans le plan (T-T) déterminé par la partie initiale (20a) à toile unique, ou à proximité dudit plan ; et par le fait que la bande (W) est ensuite guidée de manière à suivre la toile inférieure (20) dont ladite bande (W) est séparée sur la zone d'aspiration (51a) d'un rouleau de prélèvement (51), puis est transférée dans la section de presse sur un tissu de prélèvement (52).
  10. Section de formage selon l'une quelconque des revendications 1 à 9, caractérisée par le fait que, lorsque la bande (W) parvient au début de la zone à double toile, dans le cas où une partie initiale (20a) à toile unique est prévue, ou bien lorsque la bande quitte le rouleau de formage dans la partie initiale de la zone à double toile, dans le cas où aucune partie initiale à toile unique n'est prévue, la part de solides secs qu'elle, renferme se situe dans la plage d'environ 1 % à environ 3 %, de préférence dans la plage d'environ 1,2 % à environ 1,8 % et, lorsque la bande (W) s'éloigne de la zone à double toile, la part de solides secs qu'elle renferme se situe dans la plage d'environ 8 % à environ 14 %, de préférence dans la plage d'environ 10 % à environ 12 %.
EP94850086A 1993-05-18 1994-05-17 Section de formage dans une machine à papier Expired - Lifetime EP0627524B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI932265A FI99033C (fi) 1993-05-18 1993-05-18 Paperikoneen rainanmuodostusosa
FI932265 1993-05-18

Publications (2)

Publication Number Publication Date
EP0627524A1 EP0627524A1 (fr) 1994-12-07
EP0627524B1 true EP0627524B1 (fr) 2000-10-25

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EP94850086A Expired - Lifetime EP0627524B1 (fr) 1993-05-18 1994-05-17 Section de formage dans une machine à papier

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EP (1) EP0627524B1 (fr)
AT (1) ATE197177T1 (fr)
CA (1) CA2123821C (fr)
DE (1) DE69426169T2 (fr)
FI (1) FI99033C (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI100542B (fi) * 1993-11-12 1997-12-31 Valmet Paper Machinery Inc Paperikoneen hybridiformeri, joka on varustettu MB-yksiköllä
FI105934B (fi) * 1994-06-17 2000-10-31 Valmet Paper Machinery Inc Paperikoneen hybridiformerin kaksiviiravyöhykkeen sisäänmeno
FI96623C (fi) * 1994-08-31 1996-07-25 Valmet Paper Machinery Inc Kaksiviiraformeri, etenkin nopeille paperikoneille
FI953984A (fi) * 1995-08-24 1997-02-25 Valmet Corp Paperikoneen rainanmuodostusosa
DE10148921A1 (de) * 2001-10-04 2003-04-10 Voith Paper Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
DE10343914A1 (de) * 2003-09-19 2005-05-04 Voith Paper Patent Gmbh Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren
CN100427679C (zh) * 2006-05-31 2008-10-22 华南理工大学 脉动压力驱动脱水板的纸机夹网成形器
WO2013160528A1 (fr) * 2012-04-27 2013-10-31 Metso Paper, Inc. Section de formation

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4769111A (en) * 1986-07-02 1988-09-06 A. Ahlstrom Corporation Support apparatus for a dewatering unit in the web forming section of a paper machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI70615C (fi) * 1982-08-23 1986-09-24 Ahlstroem Oy Anordning foer att paoverka en pao en vira avvattnad fiberbana
FI84637C (fi) * 1988-12-01 1991-12-27 Valmet Paper Machinery Inc Foerfarande och anordning vid formning av pappers- eller kartongbana.
DE3927597A1 (de) * 1989-08-22 1991-02-28 Voith Gmbh J M Doppelsieb-former
FI920228A0 (fi) * 1992-01-17 1992-01-17 Valmet Paper Machinery Inc Banformningsparti foer pappersmaskin.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4769111A (en) * 1986-07-02 1988-09-06 A. Ahlstrom Corporation Support apparatus for a dewatering unit in the web forming section of a paper machine

Also Published As

Publication number Publication date
CA2123821C (fr) 2000-05-16
FI932265A0 (fi) 1993-05-18
FI932265A (fi) 1994-11-19
FI99033C (fi) 1997-09-25
EP0627524A1 (fr) 1994-12-07
FI99033B (fi) 1997-06-13
ATE197177T1 (de) 2000-11-15
DE69426169D1 (de) 2000-11-30
DE69426169T2 (de) 2001-05-17
CA2123821A1 (fr) 1994-11-19

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