EP0770727B1 - Procédure et dispositif pour drainage d'une bande de papier par pressage - Google Patents

Procédure et dispositif pour drainage d'une bande de papier par pressage Download PDF

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Publication number
EP0770727B1
EP0770727B1 EP96120948A EP96120948A EP0770727B1 EP 0770727 B1 EP0770727 B1 EP 0770727B1 EP 96120948 A EP96120948 A EP 96120948A EP 96120948 A EP96120948 A EP 96120948A EP 0770727 B1 EP0770727 B1 EP 0770727B1
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EP
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Prior art keywords
web
press
roll
extended
fabric
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Expired - Lifetime
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EP96120948A
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German (de)
English (en)
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EP0770727A1 (fr
Inventor
Juhani Pajula
Martti Hirsimäki
Juha Kivimaa
Pekka Taskinen
Jorma Laapotti
Mikko Karvinen
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Metso Paper Oy
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Metso Paper Oy
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip

Definitions

  • the invention concerns a method for dewatering of a paper or board web according to the preamble of claim 1, being based on "Zum von Schuhpressen” bei Schuchpressen bei Schreib-und Druckpapieren", Kliblatt für Textilfabrikation, N. 5, 1988, page 177, Fig 15.
  • the invention concerns a paper making machine according to the preamble of claim 7, being based on the above mentioned prior art document.
  • the structure of paper in particular of printing paper, must also be symmetric.
  • the good printing properties required from printing paper mean good smoothness, evenness and certain absorption properties at both faces.
  • the properties of paper, in particular the symmetry of density, are affected considerably by the operation of the press section in a paper machine, which has also a decisive significance for the evenness of the transverse profiles and longitudinal profiles of the paper.
  • Dewatering by means of pressing is energy-economically preferable to dewatering by evaporation. This is why attempts should be made to remove a maximum proportion of water out of a paper web by pressing in order that the proportion of water that must be removed by evaporation could be made as low as possible.
  • the increased running speeds of paper machines provide new, so far unsolved problems expressly in the dewatering taking place by pressing, because the press impulse cannot be increased sufficiently by the means known in prior art, above all because, at high speeds, the nip times remain unduly short and, on the other hand, the peak pressure of compression cannot be increased beyond a certain limit without destruction of the structure of the web.
  • the property profiles of the paper that is produced in the machine direction are also affected significantly by oscillations of the press section, the transverse variations of properties by the transverse profiles of the nip pressures in the press nips, and with increasing running speeds of the machine these profile problems tend to be increased remarkably.
  • the object of the present invention is to provide novel solutions for the problems discussed above so that the above drawbacks in prior art and the drawbacks that will come out later are substantially avoided.
  • An object of the invention is to provide a method for dewatering of a paper web by pressing at high speeds, in particular at speeds of about 25...40 m/s, so that the adjustability of the press section is versatile, the properties of quality of the web produced can be kept high, and the web is not subjected to excessive dynamic forces that produce breaks.
  • one of the aims is that the overall construction of the press section, in particular its frame construction, should be such that the replacement of press rolls and press fabrics can be accomplished quickly so as to minimize the standstill times.
  • the method of the invention is characterized by the features of the characterizing part of claim 1.
  • the paper making machine of the invention is characterized by the features of the characterizing part of claim 7.
  • the most important objective achieved by means of the invention is a satisfactory running quality of the paper machine even at speeds as high as about 30...40 m/s. This has been achieved because of a "linear" draw of the web and of a nip arrangement that provides sufficiently long nip times.
  • the method and the press section in accordance with the invention are intended for use above all with thin paper qualities, whose grammage is lower than 120 g/m 2 and with which a closed draw of the web is indispensable at the high web speeds meant in the invention.
  • the invention also achieves a sufficiently cautious and gentle start of the dewatering, which is important because at high speeds the water contents in the web after the former also tend to be higher.
  • the extended-nip presses are accomplished by means of hose rolls or band rolls and provided with a number of different possibilities of setting or active regulation, whereby it is possible to control the profiles of properties of the web both in the machine direction and in the transverse direction.
  • said "Sym-Belt Press” provides several advantages of synergism, of which should be mentioned that said press produces practically no oscillations at all, for which reason it is well suitable also for very high speeds, said press permits keeping of the nip loads at a sufficiently low level in particular in the initial part of the press section and makes it possible to keep the nip times at a reasonable level even at very high speeds (30...40 m/s).
  • said "Sym-Belt Press” provides entirely novel possibilities to control and to regulate the distribution of the nip pressures in the extended-nip zone both in the machine direction and in the transverse direction. Further advantages include low power consumption, elimination of difficulties of oil treatment, reduced wear of the mantle of the hose roll, and reasonable dry solids content of the web even at high speeds (30...40 m/s).
  • US Patent No. 4,584,059 as well as to the applicant's FI Patent No. 66,932 and FI Patent Applications Nos. 892517 and 892518.
  • Figure 2 is an axonometric, partly sectional view of a hose roll of a "Sym-Belt Press" applicable in the invention.
  • Figure 3 is an axonometric view of a press shoe that can be loaded and profiled in a versatile way and that is fitted inside the hose roll and employed in a press as shown in Fig. 10.
  • Figure 4 shows an alternative construction that accomplishes an extended nip and that is provided with a closed glide belt loop.
  • the press section comprises a first upper fabric 20 that receives water, onto which fabric the web W is transferred on the suction zone 21a of the pick-up roll 21 at the pick-up point P from the forming wire 10, whose return run starts from the wire drive roll 12.
  • the press has two subsequent press nips, which remove water from the web W efficiently and between which the web W has a fully closed draw so that it is constantly supported by a fabric.
  • both nips NP 1 and NP 2 are so-called extended nips, whose press zone is substantially longer than that in a normal sharp roll nip.
  • the more detailed embodiments of the extended nips will be returned to later, mainly in connection with the descriptions related to Figs. 2, 3 and 4.
  • the first upper fabric is guided by alignment, tensioning and guide rolls 22 and conditioned by conditioning devices 23.
  • the first extended nip NP 1 includes a lower fabric 30 that receives water, being guided by alignment, tensioning and guide rolls 32 and conditioned by conditioning devices 33.
  • the first extended nip NP, and so also the second extended nip NP 2 are accomplished in a "Sym-Belt Press" of the applicant, and the details of the construction of said press will be discussed later.
  • the construction of the press is such that the extended nip NP 1 is composed of a flexible hose mantle and of a backup roll.
  • the press section includes a second upper fabric 40, onto which the web is transferred as a closed draw by means of the suction zone 41a of the suction roll 41. After the first nip NP 1 , it is ensured that the web W follows the first lower fabric 30 by means of a suction box 36 or a corresponding foil arrangement.
  • the second upper fabric 40 is guided by alignment, tensioning and guide rolls 42 and conditioned by conditioning devices 43.
  • the second extended nip NP 2 is also formed in connection with a hose roll 45, which is similar to the hose roll at the extended nip NP 1 .
  • the lower press member at the nip NP 2 is a smooth-faced 105' press roll 105, in connection with whose lower sector a doctor 107 operates, which doctors the web W o going to broke handling and the leader band to the broke handling arrangement placed below (not shown).
  • the smooth face 105' of the press roll 105 makes sure that, after the extended nip NP 2 , the web W follows the face 105' of the lower roll 105, from which it is detached by means of a transfer nip N 5 and is transferred on support of the drying wire 80, which is guided by the guide roll 81, to the drying section, of which the first heated drying cylinders 82 and leading cylinders 83 are shown in the figures.
  • Single-wire draw is employed at least in the first cylinder group in the drying section.
  • the run of the web W to be pressed through the press section is highly linear without major curves. Owing to the linear path of the web, the dynamic forces applied to the web remain sufficiently low in view of minimizing the risk of breaks.
  • the magnitude of the angle a of change in the direction of the web W is in the range of a ⁇ 10...30° and, as a rule, a ⁇ 15°.
  • An exception from this may be formed by the pick-up roll 21 and its suction zone, at which locally even a high negative pressure may be employed, as well as, in Fig. 1, by the smooth-faced 105' lower press roll 105 and its turning sector b.
  • a press geometry as shown in Fig. 1 is not preferable when the maximum speed range (30...40 m/s) of the applications of the invention is employed.
  • the hose roll 200 comprises an elastic mantle 201, which is made, e.g., of fabric-reinforced polyurethane, so that the hose mantle 201 is made of rubber-like stretching material, whose maximum elongation is, e.g., about 20...40 %.
  • the thickness of the hose mantle 201 is, e.g., about 2...5 mm.
  • annular ends 202a and 202b are fixed permanently, the inner parts of said ends being fixed and sealed against revolving axle journals 207a and 207b, which are mounted on the frame parts 110 of the machine by means of fixed bearing supports.
  • the hose roll 200 includes a stationary inner frame 205, around which the hose mantle 201 with its ends 202a,202b revolves on the bearings 206a and 206b.
  • cylinder block sets 203 two sets side by side, are fitted in the inner frame 205.
  • hydraulic support members 206,207 of the glide shoe 210 operate, which members are, thus, placed in two rows, e.g., with a spacing of about 25 cm in the transverse direction one after the other.
  • the two rows of the hydraulic support members 206,207 support a support plate 209, to which a glide shoe 210, e.g., of aluminium is attached, in whose area an extended nip zone NP is formed against a backup roll.
  • the glide shoe 210 is provided with a smooth glide face 211, which operates as a press member against the smooth inner face of the hose mantle 201.
  • the glide shoe 210 has a series of hydrostatic chambers 212 placed one after the other, which chambers contribute to the formation of a hydrostatic loading pressure and to oil lubrication of the glide face 211.
  • Each of the subsequent cylinder blocks 203 communicates with a pipe connector 214, to which pipes 213 of loading medium pass so that a separately adjustable pressure can be passed into each individual block in the series of cylinder blocks 203.
  • An example of the distribution of the nip pressure in an extended-nip zone NP is such a distribution in the machine direction in which the nip pressure (the pressure applied to the web W) at the front edge of the shoe 210 rises, owing to the hydrodynamically generated pressure, to about 40 bars, whereupon the pressure remains at this value as invariable, and in the trailing area of the shoe there is still an increase in the pressure, while the peak pressure is about 70 bars, from which value the pressure goes abruptly to zero at the trailing edge of the shoe 210.
  • said distribution of pressure can be varied so as to obtain an optimal pressing result.
  • the compression pressure at the hose roll 200 and the distribution of said pressure in the machine direction can be arranged such that the start of the dewatering, while the dry solids content of the web W is still relatively low, can be carried out so gently that the fibre structure of the web W is not deteriorated.
  • a regulation system related to the invention is sketched, by whose means the pressure profiles of the extended nip NP in the transverse direction and in the machine direction can be controlled.
  • the regulation system is illustrated by the block 250, from which a series of regulation signals c 1 is given which regulate the hydraulic pressures fed through the pipes 213.
  • a feedback signal is received from separate wirings 214, which is illustrated by the series of signals c 2 .
  • the system 250 communicates with a measurement arrangement 260, by whose means the different profiles of the paper web W produced, such as moisture or thickness profiles, are measured, and this provides a series of feedback signals c, for the regulation system 250, which produces the series of regulation signals c 1 .
  • the hose roll 200 is oil-tight, and the interior of the hose 201 can be arranged as slightly pressurized. From the glide faces 211 of the glide shoes 210, a slight leakage of oil takes place, which oil is collected from inside the hose mantle 201 and passed through the pipe 215 back to the oil circulation.
  • the hose roll 200 shown in Figs. 2 and 3 is preferably mounted on fixed bearing supports, in which case the extended nip NP must be opened by means of a movement of the backup roll. This is necessary, because a play of, e.g., about 40 mm for movement of the glide shoes 210 of the hose roll is not sufficient for opening the nip NP sufficiently, e.g., for replacement of the fabrics.
  • Fig. 4 shows a second embodiment of a hose roll 300.
  • a band 301 loop is used that is longer than the circular hose mantle 201.
  • Said band 301 is guided from inside and the extended nip NP is loaded by a hydrostatically and hydrodynamically loaded glide shoe 310, which is fitted inside the band 301 loop and which has a hydrostatically loadable series of pressure fluid chambers 312 in the area of the extended nip NP.
  • a beam 305 is fitted, which is provided with a series of hydraulic loading members 306 and 307, by whose means the glide shoe 310 can be loaded in a controlled way.
  • the band loop 301 is guided by a leading roll 311, in whose connection a spreader roll 312 is operative. Both ends of the band loop 301 are closed by means of end pieces so as to prevent oil leakages and splashes, of which end pieces one piece 312a is shown in Fig. 4.
  • the more detailed embodiment of the band roll shown in Fig. 4 comes out, e.g., from the applicant's FI Pat. Appl. No. 891380 (corresp. US Pat. Appl. 486,754).
  • the backup roll used in an extended nip NP as shown in Fig. 4 is an adjustable-crown roll 160, e.g. an adjustable-crown roll marketed by the applicant under the trade mark "Sym-Z Roll", which forms an extended nip NP by means of its sector C with the band roll 300.
  • a corresponding roll can be used together with the hose roll 200.
  • the roll 160 has a cylinder mantle 161, against whose smooth inner face 162 a series of glide shoes 165 operates, which is provided with hydraulic lubrication and loading chambers 166.
  • the series of shoes 165 is loaded by means of a series of hydraulic actuators 164.
  • the backup roll 160 is employed together with the fabric 60 as a member that receives water, the outer face of the mantle 160 is provided with a hollow face.
  • the principal purpose of the roll 160 is to heat the web 60, e.g., by means of induction heating devices 170, a smooth mantle face is employed on the roll.
  • a heating device in connection with the mantle 161 of the roll 160, a heating device is provided, e.g. an inductive heating device 170, by whose means the temperature profile of the roll mantle, and thereby the profile and the dewatering capacity of the extended nip, can be affected.
  • the roll 160 can also be used so that it has a smooth outer face and that by its means the web W is pressed directly, in which case there is no fabric 60 in between, and in this way the web W can be heated directly, thereby affecting the viscosity of the water present in the web and the elastic properties of the web W, thus promoting the dewatering and the transverse profile of the dry solids content.

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Claims (13)

  1. Procédé pour drainer une bande de papier ou de carton par pressage dans une machine à papier, dans lequel la bande (W) passe d'une section de formation à une section de pressage, puis dans une section de séchage, la bande de papier ayant été drainée dans la section de formation, dans lequel le drainage est effectué en faisant passer la bande de papier sur des toiles destinées à recueillir l'eau à travers la section de pressage comprenant deux lignes de contact de drainage allongées successives (NP1, NP2) formées par un rouleau de tuyau ou un rouleau de bande et un contre-rouleau et dans lequel la bande a un tirage fermé supporté en permanence par une toile destinée à recueillir l'eau depuis le point de prise (P) de la toile de formation (10) jusqu'à la deuxième ligne de contact allongée (NP2), le procédé comprenant les étapes consistant à :
    a) transférer la bande depuis le point de prise (P) de la toile de formation (10) sur la face inférieure d'une première toile supérieure (20) destinée à recueillir l'eau ;
    b) faire passer la bande entre la première toile supérieure (20) et une première toile inférieure (30) destinée à recueillir l'eau par la première ligne de contact allongée (NP1) ;
    c) obliger la bande à suivre la première toile inférieure (30) au-delà de la première ligne de contact allongée (NP1) ;
    d) transférer la bande depuis la première toile inférieure (30) vers une deuxième toile supérieure (40) destinée à recueillir l'eau ;
    e) faire passer la bande, ainsi que la deuxième toile supérieure (40) par la deuxième ligne de contact allongée (NP2) ;
    e1) la deuxième ligne de contact allongée (NP2) étant formée entre le rouleau de tuyau ou le rouleau de bande dans une position supérieure et un contre-rouleau cylindrique à face lisse (105) dans une position inférieure ;
    e2) la bande étant en contact direct avec le contre-rouleau cylindrique à face lisse (105) pendant son passage par la deuxième ligne de contact allongée (NP2) ; et
    f) faire passer la bande le long d'une partie de la circonférence du contre-rouleau cylindrique (105) au-delà de la deuxième ligne de contact allongée (NP2),
    caractérisé en ce que
    A) la bande de papier est transférée du contre-rouleau cylindrique à face lisse (105) de la deuxième ligne de contact allongée (NP2) vers la toile de séchage (80) au moyen d'une ligne de contact de transfert formée entre le contre-rouleau et un rouleau guide (81) autour duquel passe la toile de séchage ;
    B) la longueur de chacune des lignes de contact allongées successives (NP1, NP2) est supérieure à 100 mm environ ;
    C) la bande passe par la section de pressage à une vitesse supérieure à 25 m/s environ ;
    D) le transfert de la bande de la première toile inférieure (30) à la deuxième toile supérieure (40) est effectué au moyen d'un rouleau aspirant (41) situé entre les première et deuxième lignes de contact allongées ;
    E) la répartition de la pression de compression dans au moins l'une des lignes de contact allongées est régulée et/ou sélectionnée à la fois dans le sens transversal de la bande et dans le sens machine de la bande afin de régler ou de contrôler différents profils de propriétés de la bande.
  2. Procédé selon la revendication 1, caractérisé en ce que ledit rouleau aspirant (41) est recouvert par la deuxième toile supérieure (40).
  3. Procédé selon l'une quelconque des revendications 1 à 2, caractérisé en ce que la pression de compression (P) maximale appliquée dans les zones des lignes de contact allongées (NP1, NP2) est réglée sur une plage allant de 3 à 9 MPa, de préférence de 5 à 8 MPa, et en ce que la répartition de la pression de compression est ajustée afin que dans une partie initiale des lignes de contact allongées, la pression de compression soit augmentée rapidement, après quoi elle reste essentiellement invariable, et qu'à l'extrémité arrière des lignes de contact allongées, la pression de compression soit régulée de façon à être plus élevée que dans ladite zone de pression de compression invariable.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le pressage de drainage de la bande (W) débute lorsque la teneur en matière sèche ko de la bande (W) est égale à 10%, et l'eau est extraite de la bande de sorte qu'après la section pressage, sa teneur en matière sèche kout soit égale à 35-65%, de préférence égale à 40-55%.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par l'application d'un docteur (107) sur le contre-rouleau cylindrique à face lisse (105).
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé par le conditionnement des premières toiles (20, 30) et de la deuxième toile (40) à l'aide des dispositifs de conditionnement.
  7. Machine à papier dans laquelle une bande de papier ou de carton (W) à drainer par pressage passe d'une section de formation à une section de pressage, puis dans une section de séchage, ladite section de pressage comprend deux lignes de contact allongées successives (NP1, NP2) et des toiles de pressage (20, 30, 40) destinées à recueillir l'eau passant par lesdites lignes de contact allongées, dans laquelle les toiles destinées à recueillir l'eau sont installées de telle manière que la bande de papier à drainer ait un tirage fermé supporté en permanence par une toile destinée à recueillir l'eau depuis le point de prise (P) sur la toile de formation (10) jusqu'à la deuxième ligne de contact allongée (NP2), la machine comprenant :
    a) une première toile de pressage supérieure à boucle (20) destinée à recueillir l'eau, disposée de façon à passer par la première ligne de contact allongée (NP1) ;
    b) une première toile de pressage inférieure (30) destinée à recueillir l'eau disposée de façon à passer par la première ligne de contact allongée ;
    c) ladite première ligne de contact allongée (NP1) étant formée entre un rouleau de tuyau ou de bande (25) et un contre-rouleau opposé (35) ;
    d) un premier rouleau leveur aspirant (21) placé dans la boucle de la première toile de pressage supérieure (20) afin de transférer la bande de la toile de formation sur la première toile de pressage supérieure (20) ;
    e) une deuxième toile de pressage supérieure à boucle (40) destinée à recueillir l'eau, disposée de façon à passer par la deuxième ligne de contact allongée (NP2) ;
    f) la deuxième ligne de contact allongée (NP2) étant formée entre un contre-rouleau cylindrique à face lisse (105) dans une position inférieure et un rouleau de tuyau ou de bande dans une position supérieure, la bande de papier étant en contact direct avec le contre-rouleau à face lisse (105) dans la deuxième ligne de contact allongée (NP2) et suivant la face du contre-rouleau au-delà de la deuxième ligne de contact allongée,
    caractérisée en ce que
    A) la bande de papier (W) est transférée du contre-rouleau cylindrique à face lisse (105) de la deuxième ligne de contact allongée (NP2) vers la toile de séchage (80) au moyen d'une ligne de contact de transfert formée entre le contre-rouleau et un rouleau guide (81) autour duquel passe la toile de séchage ;
    B) la longueur des deux lignes de contact allongées (NP1, NP2) est supérieure à 100 mm environ ;
    C) un deuxième rouleau leveur aspirant (41) est placé entre les première et deuxième lignes de contact allongées afin de transférer la bande de la première toile inférieure (30) sur la deuxième toile supérieure (40) ; et
    D) un docteur (107) est disposé au niveau du contre-rouleau cylindrique à face lisse de la deuxième ligne de contact allongée (NP2).
  8. Machine à papier selon la revendication 7, caractérisée en ce que ledit deuxième rouleau leveur aspirant (41) est placé dans la boucle de la deuxième toile supérieure (40).
  9. Machine à papier selon l'une quelconque des revendications 7 à 8, caractérisée en ce que la première ligne de contact allongée (NP1) est formée entre un rouleau supérieur de la presse revêtu, creux et cylindrique (35) dans une position inférieure et le rouleau de tuyau ou de bande (201) dans une position supérieure.
  10. Machine à papier selon l'une quelconque des revendications 7 à 9, caractérisée en ce que le docteur (107) est conçu pour transférer la bande au dispositif de manutention des cassés.
  11. Machine à papier selon l'une quelconque des revendications 7 à 10, caractérisée en ce qu'au moins l'un des rouleaux de tuyau ou de bande (200, 300) comprend une boucle de bande souple (301) dont les extrémités sont fermées.
  12. Machine à papier selon l'une quelconque des revendications 7 à 11, caractérisée en ce qu'au moins l'un des rouleaux de tuyau ou de bande (200, 300) est un rouleau de tuyau à extrémités fermées.
  13. Machine à papier selon l'une quelconque des revendications 7 à 12, caractérisée par des dispositifs de conditionnement (23 ; 33 ; 43) destinés à conditionner les premières toiles (20, 30) et la deuxième toile (40).
EP96120948A 1990-11-23 1991-11-22 Procédure et dispositif pour drainage d'une bande de papier par pressage Expired - Lifetime EP0770727B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI905798A FI96789C (fi) 1990-11-23 1990-11-23 Menetelmä ja laite veden poistamiseksi paperiradasta puristamalla
FI905798 1990-11-23
EP91850291A EP0487483B1 (fr) 1990-11-23 1991-11-22 Procédé et dispositif pour égoutter une bande de papier par pressage

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EP91850291.5 Division 1991-11-22
EP91850291A Division EP0487483B1 (fr) 1990-11-23 1991-11-22 Procédé et dispositif pour égoutter une bande de papier par pressage

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EP0770727A1 EP0770727A1 (fr) 1997-05-02
EP0770727B1 true EP0770727B1 (fr) 2002-06-05

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EP96120948A Expired - Lifetime EP0770727B1 (fr) 1990-11-23 1991-11-22 Procédure et dispositif pour drainage d'une bande de papier par pressage
EP91850291A Expired - Lifetime EP0487483B1 (fr) 1990-11-23 1991-11-22 Procédé et dispositif pour égoutter une bande de papier par pressage

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EP91850291A Expired - Lifetime EP0487483B1 (fr) 1990-11-23 1991-11-22 Procédé et dispositif pour égoutter une bande de papier par pressage

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EP (2) EP0770727B1 (fr)
AT (2) ATE218648T1 (fr)
CA (1) CA2055927C (fr)
DE (2) DE69129788T2 (fr)
FI (1) FI96789C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10343215A1 (de) * 2003-09-18 2005-04-14 Voith Paper Patent Gmbh Schuhwalze

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ATE218648T1 (de) 2002-06-15
EP0770727A1 (fr) 1997-05-02
CA2055927C (fr) 1999-02-02
ATE168423T1 (de) 1998-08-15
DE69129788D1 (de) 1998-08-20
FI905798A0 (fi) 1990-11-23
DE69129788T2 (de) 1998-11-19
FI96789C (fi) 1996-08-26
CA2055927A1 (fr) 1992-05-24
DE69133030D1 (de) 2002-07-11
FI96789B (fi) 1996-05-15
EP0487483B1 (fr) 1998-07-15
EP0487483A1 (fr) 1992-05-27
FI905798A (fi) 1992-05-24
DE69133030T2 (de) 2002-11-21

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