EP1153169B1 - Procede et dispositif de formation d'une ame de pate a papier - Google Patents

Procede et dispositif de formation d'une ame de pate a papier Download PDF

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Publication number
EP1153169B1
EP1153169B1 EP99958204A EP99958204A EP1153169B1 EP 1153169 B1 EP1153169 B1 EP 1153169B1 EP 99958204 A EP99958204 A EP 99958204A EP 99958204 A EP99958204 A EP 99958204A EP 1153169 B1 EP1153169 B1 EP 1153169B1
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EP
European Patent Office
Prior art keywords
pulp
web
set forth
water
wires
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
EP99958204A
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German (de)
English (en)
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EP1153169A1 (fr
Inventor
Risto Savia
Jorma Koskinen
Leo Lund N
Esa Markkanen
Ilkka Pakkala
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Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1153169A1 publication Critical patent/EP1153169A1/fr
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Publication of EP1153169B1 publication Critical patent/EP1153169B1/fr
Anticipated expiration legal-status Critical
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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
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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
    • 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

Definitions

  • the present invention relates to a method as set forth in the preamble of claim 1 for forming pulp web.
  • the pulp drying process and more specifically the web formation of pulp stock, can be implemented in a preferred fashion.
  • the invention relates also to an apparatus as set forth in the preamble of claim 8.
  • the publication US 3823062 discloses a twin-wire web formation apparatus, comprising a wedge-shaped gap constituted by two wires, the pulp being delivered therein for web formation. It has been stated that the gap constituted by the wires be created by means of drainage boxes, supporting the wires and boundary to the wire with a water permeable surface. According to the publication, the web formation is regulated by measuring and throttling the quantity of percolated water flowing out of the drainage boxes. This presents the method very schematically and it involves a number of shortcomings, particularly if the equivalent method is applied to pulp web formation.
  • this prior art method provides a very difficult way of controlling the formation of a web and its coherence downstream of a the formation section, especially with a thick web, which is usually the case with pulp.
  • This solution has its limitations also in terms of its dewatering capacity, it is not capable of reaching a dry content substantially higher than about 12%, since the pressure would increase at the downstream end of a wedge-shaped section to such a high level that the pulp would discharge from the gap portion unmanageably, which causes the wire sections to come apart, resulting in the web losing control of its coherence and the failure of web formation.
  • the Finnish publication print 61218 discloses a pulp drying machine, said machine comprising a wet or wedge-shaped section, a register section with a number of twin rolls, a forward press section, as well as a main press section for applying compression to a material being dried.
  • This publication suggests that the wet section be provided with vacuum boxes for absorbing moisture through the wires. Even in this type of solution, the vacuum system brings along the above-mentioned drawbacks.
  • a method of the invention for forming pulp web comprising feeding pulp from a head box into a wedge-shaped converging space defined by two wires or the like, said wires or the like being supported on chamber units, each including at least one water-receiving chamber, in which method the pulp has its dry content increased in the converging space to the value of at least about 10% to about 12%, is characterized in that the method comprises, in the substantially immediate vicinity of the converging space and/or its downstream end section, subjecting the pulp to an independently adjustable compression force perpendicular (z direction) thereto.
  • An apparatus of the invention for pulp web formation comprising a wedge-shaped converging space defined by two wires or the like, said space being supplied with pulp at a first dry content from a head box, and said wires or the like being supported on chamber units, each including at least one water-receiving chamber, is characterized in that the converging space has its downstream section or its substantially immediate vicinity provided with compaction members for subjecting the pulp between the wires or the like to a compression in the perpendicular direction (z direction).
  • the compaction members are designed as a plane press.
  • Fig. 1 shows schematically an apparatus 1 of the invention for forming a web W.
  • the apparatus comprises a headbox 2, which is used, according to a pulp drying process of the invention, for supplying pulp at a dry content of at least about 1,5% into a converging wedge-shaped space 5 defined between two endless wire loops, such as an upper wire 3 and a lower wire 4.
  • the space 5 is formed by adapting the wires 3, 4 to travel around spaced-apart reverse rolls 50 and 51, respectively, set at the upstream end of the space 5, and thence in a relatively converging fashion for defining a wedge-shaped space.
  • chamber units 6 and 7, respectively In engagement with the inside surface of the wires 3 and 4 (away from the pulp flow) are mounted chamber units 6 and 7, respectively, which are provided with a number of dewatering chambers 8, the flow rate, and secondarily also the pressure, of water to be discharged from pulp therethrough being regulable by means of valves 22 and which, as the process is going on, are substantially full of water removed from the pulp.
  • the water discharging from pulp is guided to mix with already removed water in the chambers 8, and further into discharge channels.
  • From the dewatering chambers extend water discharge channels for carrying water removed from the web to a further process.
  • the flow of water discharging from a pulp web is regulated as desired for this way controlling the dewatering process.
  • the discharge channels are provided with the valves 22 for regulating the flow rate by variable throttling. It is desirable that the flow rate for each chamber be maintained at a preset value.
  • the figure only depicts the channels from the lower chambers, but it is obvious that the upper chambers are also provided with respective channels, or, alternatively, the respective chambers in an upper and lower tier are connected to a single, common channel.
  • pulp is delivered at such a rate and pressure between the wires 3, 4 while the same are running that said space 5 carries a positive pressure. This overpressure results in the percolation of pulp water through the wires into the dewatering chambers 8. What is essential is that there is a pressure difference between the dewatering chambers and the space 5.
  • a pressure difference between the space 5 and the dewatering chambers 8 is measured continuously and this measuring value is used in process control.
  • Dewatering from the chambers 8 is regulated in such a way that the speed ratio within the area of each chamber is preferably about 0,9-1,1.
  • the speed ratio refers to a flow of liquid occurring between the chambers parallel to the web divided by the wire advancing speed.
  • the chambers 8 are otherwise substantially impervious, except that the surfaces in engagement with the wires 3, 4 are such that the water to be removed from pulp is able to migrate into the chambers 8.
  • the separate chamber units 6, 7 commence substantially directly downstream of the reverse rolls 50, 51 for the top wire 3 and bottom wire 4, and extend a certain distance to define the wedge-shaped converging space 5, the upper and lower wire 3, 4 passing therethrough.
  • the chamber units 6, 7 are substantially symmetrical and fixedly supported in a suitable position for providing a preferred wedge shape.
  • the converging space 5 defined by the chamber units 6, 7 is provided in its downstream section, or in the immediate vicinity thereof, with a compaction member 9 for adjusting a relative distance between the upper wire 3 and the lower wire 4 or the like as desired.
  • the compaction members are depicted to comprise a plane press 9, having its top element 31, 43 articulated, while its bottom element 30 is solid.
  • the pulp delivers water in such a way that the pulp has a dry content of at least 12% before the plane press 9, and the plane press is used for removing more water from the pulp in such a way that, after the plane press 9, its dry content is about 18%, preferably about 20%.
  • the dry content can also be increased to about 18-20% as early as within the converging space 5 and the plane press 9 can thus be used merely to substantially maintain the coherence of pulp emerging from the outlet of the space 5.
  • the pulp emerging from the wedge-shaped space comes out of the space 5 at a high pressure and, without the compaction members of the invention, that would occur uncontrollably and the wires 3, 4 would spread apart, resulting in disintegration of the already formed pulp web.
  • the web W is carried further, in accordance with the invention, on the top surface of the lower wire 4, the web having a dry content of roughly 28%.
  • the web travels in a fully supported condition.
  • the lower wire has its bottom surface fitted with a so-called transfer vacuum box for securing a passage of the web along with the lower wire.
  • the web W is carried further in a supported condition on the top surface of the lower wire 4 through a press nip N, comprising an upper felt 14, i.e. the web W travels with its top side against the felt and its bottom side against the lower wire 4 in the nip N between rolls 12, 13.
  • the nip is preferably constituted by a so-called shoe press.
  • a pulp web can be formed and effectively dewatered by means of a comprehensive process, wherein pulp is delivered into the converging wedge-shaped space 5 defined between two endless wire loops, such as the upper wire 3 and the lower wire 4, having a plurality of dewatering chambers 8 in communication with the wedge-shaped space, the flow rate of water to be removed from the pulp therethrough being regulable, wherein the water flow discharging from the pulp web is adjusted as desired for thus controlling the dewatering process, wherein the converging space 5 defined by the chamber units 6, 7 is provided in its downstream section, or in the immediate vicinity thereof, with the compaction member 9 for adjusting a relative distance between the upper wire 3 and the lower wire 4 or the like as desired, wherein the web W is subsequently advanced further, according to the invention, on the top surface of the lower wire 4 in a supported condition through the press nip N, comprising the upper felt 14, i.e.
  • nip being especially preferably constituted by a so-called shoe press for providing a sufficient nip pressure and a long action time.
  • the web W is dried in such a way that its dry content downstream of the nip N is roughly 40%.
  • the above-described method of the invention can be used in a pulp drying machine for the effective and reliable formation of the web W.
  • This solution provides a simplified former section and the web W is comprehensively supported until it has a dry content of roughly 40%, at which point it has a sufficient strength to withstand without breaking a first unsupported passage to the subsequent process phase.
  • the pulp web has also a considerable thickness and, thus, according to the invention, the passage of the lower wire 4, to the extent that it supports the web W, is adapted to extend in a substantially straight line.
  • the invention provides major benefits, which include e.g.:
  • Fig. 2 shows schematically an apparatus 1 which differs from the embodiment of fig. 1 principally in that the plane press 9 is designed to be adjustable regarding both its top element and its bottom element.
  • fig. 2 depicts an adjustment and control unit 21, which is connected to appropriate measuring devices transmitting measuring data and which in turn transmits drive commands to various appropriate elements, as shown by way of example with lines 15-20.
  • data contains some or all of the following: headbox supply consistency, headbox pressure, pressure in space 5, pressure in chambers 8, speed of wires, compression force/pressure of plane press, water flow rate through valves 22.
  • the drive may preferably include the following controls: control of valves 22, loading of plane press, speed of wires, control for headbox supply pump, control of headbox consistency, etc.
  • the plane press 9 may be provided with a loadcell and/or a pressure measuring sensor for measuring and adjusting the compression force.
  • a gauge for measuring of pressure from the chambers and, if desired, also a pressure transmitter for measuring pressure in the space 5 and/or for determining a pressure difference between the chamber 8 and the space 5, whereby it is possible to use e.g.
  • the valve 22 for effecting the adjustment of a pressure difference between the chamber and the space 5.
  • the web W is also measured for its dry content at a suitable point of the drying process, making it possible on the basis of information received therefrom to execute drive commands, if necessary, by means of the adjustment/control unit.
  • the pressure can be regulated as desired in the space 5, as well as by means of the plane press 9 and the press rolls 10, 11 and 12, 13 for adjusting the dry content and dewatering as desired at various points.
  • the discharge of water from the chamber 8 is controlled comprehensively by observing all operating parameters of a drying machine, explicitly on the basis of information originating from the process, and not just the water flow rate out of the chamber, the drying/dewatering process can be driven in such a way that it proceeds as desired and continuously in an optimal fashion.
  • Figs. 3 and 4 depict one embodiment for the plane press 9, including a solid bottom element 30, and a top element 31 whose position relative to the bottom element 30 is adjustable.
  • the top element 31 is articulated at 32 to the downstream portion of a space 5.
  • the pulp is delivered between the wires from the space 5 along a slot 40.
  • the element 31 is secured to upright struts 35 linked to each other at the bottom part thereof by a connecting member 37, which is in turn fastened through the intermediary of cushion elements or bellows 36 to the solid bottom element 30 of the plane press 9.
  • a web to be delivered out of the space 5 can be guided forward in a controlled fashion, the top and bottom elements of the plane press being adjustable regarding the relative position thereof, as well as relative to the position of the chamber units.
  • the loading of the plane press is effected by means of implements which are capable of complying to suitable degree with possible fluctuations in web thickness.
  • the plane press is loaded with a desired force by means of regulable adjusting rods 33 or the like, with a certain force against these rods 33, for maintaining a certain stable setting. Consequently, the relative position between the top element 31 and the bottom element 30 can be mechanically defined by means of adjustable implements.
  • the adjusting rods or the like are preferably provided with actuators for setting the same while the machine is running, if, for example, the plane press is in a position which must be reset because of a change in production.
  • the loading can be implemented preferably by means of the cushions 36 using a compressible medium, e.g. air, whereby an occasional increase in web thickness is compensated for by the compressibility of the medium. After the malfunction has passed, the distance returns automatically back to what it was.
  • a compressible medium e.g. air
  • this solution is capable in a very simple manner of eliminating malfunctions possibly occurring in pulp, causing fluctuations in thickness. It is also possible to provide a different type of distance control, the plane press having its position adjusted by means of pressure and distance measurement.
  • compaction member is a plane press, but the invention is conceivable also be using a compaction member, which comprises a nip press constituted by two rolls, the nip thereof being located in the immediate vicinity of the outlet of a converging space.
  • a compaction member which comprises a nip press constituted by two rolls, the nip thereof being located in the immediate vicinity of the outlet of a converging space.
  • This can be implemented, e.g. as shown in fig. 5, by designing a tail-end section 61 of the chamber units to extend to the proximity of the nip constituted by rolls 61, 62.

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  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Claims (17)

  1. Procédé pour la formation de nappe à pâte, ledit procédé comprenant l'alimentation de la pâte à partir d'une caisse de tête (2) dans un espace convergeant en forme de coin (5) défini par deux toiles (3, 4) ou identique, lesdits toiles ou identiques étant supportés sur des unités de chambre (6, 7) chacun comprenant au moins une chambre de réception d'eau (8), dans lequel procédé la pâte a siccité augmentée dans l'espace en coin (5) jusqu'à une valeur de 10 % au moins à 12 % au moins, caractérisé en ce que le procédé comprend, dans le voisinage sensiblement immédiat de l'espace convergent (5) et/ou de sa section d'extrémité en aval, soumettant la pâte à une force de compression indépendamment ajustable qui y est perpendiculaire (sens z), cela veut dire qu'au moins une chambre de réception d'eau est, pendant le déroulement du processus, sensiblement pleine de l'eau retirée de la pâte, et cela est fourni par un ensemble de déshydratation, de même qu'avec deux dispositifs (22) pour réguler le taux d'écoulement de l'eau.
  2. Procédé comme énoncé dans la revendication 1, caractérisé en ce que la force de compression que l'on applique dans la section en aval de l'espace convergent et/ou dans son voisinage sensiblement immédiat soumet la pâte à une pression qui est au moins égale à la pression existant dans l'espace convergent (5), la nappe ayant une siccité suffisante pour lui permettre de résister au traitement de prépresse qui suit.
  3. Procédé selon la revendication 2, caractérisé en ce que la nappe a sa siccité augmentée au moyen de ladite force de compression jusqu'à la valeur d'au moins 18 % environ.
  4. Procédé selon la revendication 1, caractérisé en ce que, après que l'on ai soumis la nappe à pâte à une force de compression perpendiculaire (sens z), on transporte ensuite la nappe entre les deux toiles (3, 4) à travers une zone de prépresse séparée (10, 11), et on suit cela en guidant la toile supérieure (3) et la toile inférieure (4) en éloignement l'une de l'autre, et on avance ensuite une nappe (W) sur la surface supérieure de la toile inférieure (4).
  5. Procédé selon la revendication 1 ou 4, caractérisé en ce que l'on transporte la nappe (W) sur la surface supérieure de la toile inférieure (4) dans une condition supportée à travers une ligne de contact de presse (N), comprenant un feutre supérieur (14), par exemple la nappe (W) circule avec son côté supérieur contre le feutre et son côté inférieur contre la toile inférieure (4) dans la ligne de contact (N) entre les rouleaux (12, 13), dans lequel ce processus comprend le séchage de la nappe (W) de telle façon que sa siccité en aval de la ligne de contact (N) soit au moins de 40 % grossièrement.
  6. Procédé selon la revendication 1, caractérisé en ce que ladite au moins une chambre recevant l'eau (8) est pourvue d'éléments pour mesurer une pression depuis le chambre, de même que d'éléments de réglage et de commande (21) pour utiliser cette mesure de pression pour le contrôle du processus.
  7. Procédé selon la revendication 1, caractérisé en ce que les dispositifs (22) pour régler le débit de l'eau sont reliés à l'unité de réglage/commande (21), ladite unité de réglage et de commande pilotant les dispositifs pour régler le débit d'eau sur la base de l'information provenant du processus.
  8. Procédé selon la revendication 7, caractérisé en ce que l'unité de réglage et de commande pilote les dispositifs pour régler le débit de l'eau sur la base de l'information provenant du processus.
  9. Appareil pour la formation de nappe à pâte, ledit appareil (1) comprenant un espace convergent en forme de cône (5) défini par deux toiles (3, 4) ou identique, ledit espace étant alimenté avec la pâte à une première siccité à partir d'une boite de tête (2), et lesdites toiles ou identiques étant supportées sur des unités de chambre (6, 7) ; chacune comprenant au moins une chambre recevant l'eau (8),caractérisé en ce que l'espace convergent (5) a sa section en aval ou son voisinage sensiblement immédiat pourvu d'éléments de compactage (9) pour soumettre la pâte présente entre les toiles (3, 4) ou identiques à une compression dans le sens perpendiculaire (sens z), que ladite au moins une chambre de réception d'eau est, pendant le déroulement du processus, sensiblement pleine d'eau retirée de la pâte, et qu'elle est pourvue d'un ensemble d'élimination d'eau, de même que de dispositifs (22) pour régler le débit d'eau.
  10. Appareil selon la revendication 9, caractérisé en ce que les éléments de compactage (9) sont pourvus de groupes moteur pour appliquer la compression avec une pression qui est au moins égale à la pression existant dans l'espace de convergence (5) pour augmenter la siccité de la pâte jusqu'à une valeur qui est sensiblement plus élevée que ladite première valeur.
  11. Appareil selon la revendication 9, caractérisé en ce que les éléments de compactage (9) sont pourvus de groupes moteur qui sont constitués d'éléments (36) pour compenser les fluctuations momentanées du sens machine dans l'épaisseur de la nappe.
  12. Appareil selon la revendication 11, caractérisé en ce que les éléments de compensation des fluctuations momentanées du sens machine dans l'épaisseur de la nappe comprennent un coussin d'air (36) pour compenser les actions momentanées de l'élément de compactage (9) ;
  13. Appareil selon la revendication 9, cvaractérisé en ce que les éléments de compactage (9) pour la compression perpendiculaire de la pâte présente entre les toiles (3, 4) ou identiques sont pourvus d'un dispositif de mesure, de réglage et de commande (21) pour commander la compression.
  14. Appareil selon la revendication 13, caractérisé en ce que les éléments de compactage (9) pour la compression de la pâte présente entre les toiles (3, 4) ou identiques sont pourvus de dispositifs de mesure pour mesurer la force de compression et/ou la pression, de même que de dispositifs de mesure pour mesurer une pression de l'espace (5), de même que d'éléments pour ajuster la pression existante entre les éléments de compactage (9) de façon qu'elle soit au moins égale à la pression existante dans l'espace (5).
  15. Appareil selon la revendication 9, caractérisé en ce que les éléments de compactage (9) sont constitués d'une presse plane (30, 31), dans laquelle on peut mécaniquement définir la position relative entre un élément supérieur (31) et un élément inférieur (30) au moyen d'accessoires ajustables (33).
  16. Appareil selon la revendication 15, caractérisé en ce que les accessoires (33) sont pourvus d'actionneurs pour régler ceux-ci pendant le fonctionnement de la machine.
  17. appareil selon la revendication 9, caractérisé en ce que les éléments de compactage comprennent une ligne de contact de presse constituée de deux rouleaux (61, 62).
EP99958204A 1998-11-24 1999-11-24 Procede et dispositif de formation d'une ame de pate a papier Expired - Lifetime EP1153169B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI982539 1998-11-24
FI982539A FI109210B (fi) 1998-11-24 1998-11-24 Menetelmä ja laite selluloosarainan muodostamiseksi
PCT/FI1999/000967 WO2000031337A1 (fr) 1998-11-24 1999-11-24 Procede et dispositif de formation d'une ame de pate a papier

Publications (2)

Publication Number Publication Date
EP1153169A1 EP1153169A1 (fr) 2001-11-14
EP1153169B1 true EP1153169B1 (fr) 2004-02-25

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EP99958204A Expired - Lifetime EP1153169B1 (fr) 1998-11-24 1999-11-24 Procede et dispositif de formation d'une ame de pate a papier

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Country Link
EP (1) EP1153169B1 (fr)
JP (1) JP4523166B2 (fr)
AT (1) ATE260360T1 (fr)
AU (1) AU1562300A (fr)
CA (1) CA2351490C (fr)
DE (1) DE69915130T2 (fr)
FI (1) FI109210B (fr)
WO (1) WO2000031337A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001036742A2 (fr) * 1999-11-17 2001-05-25 Andritz Ag Dispositif d'assechement pour bande de matiere fibreuse
FI117395B (fi) * 2000-11-16 2006-09-29 Metso Paper Inc Laite ja menetelmä veden poistamiseksi selluloosarainasta
DE60314638T2 (de) 2003-11-14 2008-03-06 The Procter & Gamble Company, Cincinnati Polymere Zusammensetzungen für die anhaltende Freigabe flüchtiger Materialien
EP1795556B1 (fr) 2005-12-07 2017-02-15 The Procter and Gamble Company Composition pour la libération prolongée de substances volatiles
EP2342380A4 (fr) * 2008-05-28 2012-04-11 Metso Paper Inc Presse à toile double et procédé d'élimination de l'eau contenue dans une suspension de fibres
US8236139B1 (en) 2008-06-30 2012-08-07 International Paper Company Apparatus for improving basis weight uniformity with deckle wave control
AT509992B1 (de) 2010-10-27 2012-01-15 Andritz Ag Maschf Vorrichtung und verfahren zur trocknung von faserstoff
JP6245053B2 (ja) * 2014-04-23 2017-12-13 王子ホールディングス株式会社 パルプシートの製造方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823062A (en) * 1972-02-28 1974-07-09 Int Paper Co Twin-wire papermaking employing stabilized stock flow and water filled seal(drainage)boxes
AT348325B (de) * 1977-02-14 1979-02-12 Andritz Ag Maschf Presspartie fuer entwaesserungsmaschinen
FR2428682A1 (fr) * 1978-06-16 1980-01-11 Stephanois Rech Meca Hydr Cent Procede de conditionnement de surface d'une piece metallique et surface obtenue
JPS57112495A (en) * 1981-11-06 1982-07-13 Int Paper Co Papermaking apparatus
FI85885C (fi) * 1987-11-25 1992-06-10 Tampella Oy Ab Foerfarande foer formering av en fiberbana i en pappersmaskin samt en anordning foer utfoering av foerfarandet.
WO1997039182A1 (fr) * 1996-04-18 1997-10-23 Valmet Corporation Procede continu de regulation generale de la caisse de tete et/ou du formeur d'une machine a papier ou a carton
US5783045A (en) * 1996-05-06 1998-07-21 Beloit Technologies, Inc. Pulp and linerboard former with improved dewatering

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Publication number Publication date
CA2351490A1 (fr) 2000-06-02
CA2351490C (fr) 2007-08-21
JP4523166B2 (ja) 2010-08-11
AU1562300A (en) 2000-06-13
FI109210B (fi) 2002-06-14
WO2000031337A1 (fr) 2000-06-02
JP2002530547A (ja) 2002-09-17
FI982539A (fi) 2000-05-25
DE69915130D1 (de) 2004-04-01
DE69915130T2 (de) 2004-12-30
ATE260360T1 (de) 2004-03-15
FI982539A0 (fi) 1998-11-24
EP1153169A1 (fr) 2001-11-14

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