EP0627524B1 - Blattbildungspartie in einer Papiermaschine - Google Patents

Blattbildungspartie in einer Papiermaschine 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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English (en)
French (fr)
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EP0627524A1 (de
Inventor
Jyrki Jaakkola
Seppo Kiviranta
Ari Linsuri
Michael Odell
Antti Poikolainen
Samppa Salminen
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Valmet Technologies Oy
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Valmet Oy
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Publication of EP0627524A1 publication Critical patent/EP0627524A1/de
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00Complete machines for making continuous webs of paper
    • D21F9/003Complete machines for making continuous webs of paper of the twin-wire type
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/48Suction 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.

Landscapes

  • Paper (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Making Paper Articles (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Claims (10)

  1. Bahnformer in einer Papiermaschine, wobei der Former eine Doppelsiebzone aufweist, die gebildet wird, indem ein schleifenförmiges oberes Sieb (10) über ein schleifenförmiges unteres Sieb (20) geführt wird, welche Doppelsiebzone in dem Bereich oder in der Nähe des gekrümmten gerippten Auflagers (22a) eines innerhalb der unteren Siebschleife (20) platzierten Formungsschuhs (22) beginnt, wobei
    der Former einen bevorzugt im Wesentlichen horizontalen Einzelsiebinitialabschnitt (20a) aufweist, der der Doppelsiebzone vorangeht und in Verbindung mit dem schleifenförmigen unteren Sieb (20) gebildet ist, auf welchem Einzelsiebinitialabschnitt (20a) ein Stoffstrahl (J) gespeist wird, wobei der Stoffstrahl alternativ direkt in einen, zwischen den oberen und unteren Sieben gebildeten Spaßt gespeist wird, und zwar ohne Einzelsiebinitialabschnitt, in welchem Falle die Doppelsiebzone einen Initialabschnitt aufweist, der in Verbindung mit einer Formungswalze gebildet ist, über die die Doppelsiebzone derart gekrümmt wird, dass Wasser hauptsächlich durch die untere Siebschleife drainiert wird, wobei
    der Former ferner eine mit Druck beaufschlagte Entwässerungseinheit (100) in dem Bereich der Doppelsiebzone hat, und die mit Druck beaufschlagte Entwässerungseinheit (100) aufweist:
    eine erste Entwässerungskammer (12), die oberhalb des Formungsschuhs (22) innerhalb der oberen Siebschleife (10) platziert ist und mit einer unteren Wand (12c) versehen ist, die oberhalb des Auflagers (22a) einen Spaltraum (12b) definiert, durch welchen Spaltraum (12b) Wasser, das hauptsächlich von dem Bereich des Auflagers (22a) herstammt, drainiert wird und durch einen vertikalen Saugablenkkanal (16) in die erste Entwässerungskammer (12) geleitet wird,
    eine, der ersten Entwässerungskammer (12) innerhalb der oberen Siebschleife (10) folgende zweite Entwässerungskammer (13), einen Satz von Entwässerungs- und Führungsrippen (41a, 41, 41b), die mit dem unteren Teil der zweiten Entwässerungskammer (13) verbunden sind, wobei die erste Entwässerungs- und Führungsrippe (41a) an dem Hals (K) in dem unteren Ende des Saugablenkkanals (16) ortsfest ist und als eine Ablenkrippe arbeitet, wobei Wasser durch die Spalträume (41R) zwischen den Entwässerungs- und Führungsrippen (41a, 41, 41b) drainiert wird und durch einen Drainagekanal (19), der in die Spalträume (41R) mündet, in die zweite Entwässerungskammer (13) geleitet wird,
    eine Belastungseinheit (23), die innerhalb der unteren Siebschleife (20) nach dem Formungsschuh (22) platziert ist und mit Belastungsrippen (31a, 31b, 31c) versehen ist, die gegen das untere Sieb (20) gepresst werden, bevorzugt mit Hilfe von Belastungsschläuchen (33), in die ein Druckmedium geleitet wird, wobei die erste Belastungsrippe oder das Paar von Belastungsrippen (31a) unterhalb der ersten Entwässerungskammer (12) vor der ersten Entwässerungs- und Führungsrippe (41a) angebracht ist, und wobei die erste Belastungsrippe oder das Paar von Belastungsrippen (31a) von einem Satz von Belastungsrippen (31b, 31c) gefolgt wird, der gegen den Satz von Entwässerungs- und Führungsrippen (41a, 41, 41b) arbeitet.
  2. Bahnformer nach Anspruch 1, dadurch gekennzeichnet, dass die Entwässerungs- und Führungsrippen (41a, 41, 41b) allesamt ortsfeste Rippen sind, dass bevorzugt vier bis sieben Entwässerungs- und Führungsrippen vorgesehen sind, und dass nach der letzten Rippe (41b) des Satzes von Entwässerungs- und Führungsrippen eine oder mehrere ortsfeste Führungsrippen (31b) vorgesehen sind, die innerhalb der unteren Siebschleife (20) platziert und an einem Rahmenteil der Belastungseinheit (23) befestigt sind.
  3. Bahnformer nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass jede der ersten und zweiten Entwässerungskammern (12, 13) mit einer Unterdruckquelle (50) derart in Verbindung steht, dass der Unterdruck (p1, p2), der in den Entwässerungskammern (12, 13) vorhanden ist, unabhängig festgelegt und/oder reguliert werden kann, und dass die Entwässerungskammern (12, 13) mit zweiten Drainagekanälen (12f, 13b) bevorzugt lediglich an der Antriebsseite der Maschine in Verbindung stehen.
  4. Bahnformer nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Formungsschuh (22) und/oder ein Rahmenkasten der Belastungseinheit (23) mit einer Unterdruckquelle (p0, p3) in Verbindung stehen/steht.
  5. Bahnformer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Halsteil (K), das an dem unteren Ende des Saugablenkkanals (16) platziert ist, derart eingerichtet Worden ist, dass dessen Dimensionierung und/oder Profil einstellbar ist, wobei das Halsteil mit einer auswechselbaren Formrippe (17a) versehen ist, die eine Wand ausbildet, die das Halsteil hauptsächlich von oben definiert, sodass die Ausmaße und die Gestalt des Halsteiles (K) durch Auswechseln der Formrippe (17a) mit einer anderen Formrippe festlegbar ist, um die Ausmaße und die Gestalt der gekrümmten äußeren Fläche (17c) der Formrippe zu ändern.
  6. Bahnformer nach Anspruch 5, dadurch gekennzeichnet, dass die auswechselbare Formrippe (17a) an der äußeren Fläche der unteren Wand, bevorzugt eine ebene Wand (12d), der ersten Entwässerungskammer (12) mittels einer Aussparungs-/Vorsprungsverbindung (12e, 17b) oder einer äquivalenten Einschnappverbindung angebracht ist.
  7. Bahnformer nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass vor der Doppelsiebzone sich eine Einzelsiebformungszone (20a) befindet, die bevorzugt im Wesentlichen horizontal ist, dass die Doppelsiebzone von der Ebene (T-T) des Einzelsiebinitialabschnitts (20a) an dem gekrümmten gerippten Auflager (22a) des Formungsschuhs (22) nach unten gekrümmt wird und weiter nach unten geneigt verläuft, und zwar geführt mittels der druckbeaufschlagten gerippten Zone der Entwässerungseinheit (100), nach welcher in der Doppelsiebzone eine innerhalb der oberen Siebschleife (10) platzierte Formungswalze (14) folgt, die bevorzugt mit einer glatten festen Fläche (14') versehen ist, und an der die Doppelsiebzone in einen nach oben geneigten Verlauf gekrümmt wird, an welchem sich ein zweiter Formungsschuh (24) innerhalb der unteren Siebschleife (20) befindet, wobei die Doppelsiebzone in dem Bereich des gerippten Auflagers (24a) des zweiten Formungsschuhs (24) mit einem großen Krümmungsradius (R2) in der entgegengesetzten Richtung gekrümmt wird, und zwar im Vergleich mit der vorangegangenen Krümmungszone (a), und dass der zweite Formungsschuh (24) von einer zweiten Formungswalze (25) gefolgt wird, die innerhalb der unteren Siebschleife (20) platziert ist und auf der die Doppelsiebzone in einen nach unten geneigten Verlauf mit einem Krümmungsradius (R3) gekrümmt wird, der beträchtlich kleiner ist als der Krümmungsradius (R2) der vorangegangenen Zone.
  8. Bahnformer nach Anspruch 7, dadurch gekennzeichnet, dass nach der zweiten Formungswalze (25) eine Formungs- oder Führungswalze (11b), die innerhalb der oberen Siebschleife (10) platziert ist, die Doppelsiebzone in oder nahe der Ebene (T-T) führt, die mittels des Einzelsiebinitialabschnitts (20a) bestimmt wird, und dass danach die Bahn (W) geführt wird, um dem unteren Sieb (20) zu folgen, von welchem die Bahn (W) an der Saugzone (51a) einer Abnahmewalze (51) separiert und auf einem Abnahmefilz (52) in die Pressenpartie transferiert wird.
  9. Bahnformer nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass, wenn die Bahn (W) im Falle, dass ein Einzelsiebinitialabschnitt (20a) vorgesehen ist, an dem Beginn der Doppelsiebzone ankommt, oder wenn die Bahn im Falle, dass kein Einzelsiebinitialabschnitt vorgesehen ist, die Formungswalze in dem Initialabschnitt der Doppelsiebzone verlässt, sich deren Trockenfeststoffanteil innerhalb des Bereichs von etwa 1 % bis etwa 3 % befindet, bevorzugt innerhalb des Bereichs von etwa 1,2 % bis etwa 1,8 %, und, wenn die Bahn (W) die Doppelsiebzone verlässt, sich deren Trockenfeststoffanteil innerhalb des Bereichs von etwa 8 % bis etwa 14 % befindet, bevorzugt innerhalb des Bereichs von etwa 10 % bis etwa 12 %.
EP94850086A 1993-05-18 1994-05-17 Blattbildungspartie in einer Papiermaschine Expired - Lifetime EP0627524B1 (de)

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 (de) 1994-12-07
EP0627524B1 true EP0627524B1 (de) 2000-10-25

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

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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 (en) * 2012-04-27 2013-10-31 Metso Paper, Inc. Forming section

Citations (1)

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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

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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)

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

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