EP0195807B1 - Systeme de caisse de tete pour machine a papier - Google Patents

Systeme de caisse de tete pour machine a papier Download PDF

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Publication number
EP0195807B1
EP0195807B1 EP85904806A EP85904806A EP0195807B1 EP 0195807 B1 EP0195807 B1 EP 0195807B1 EP 85904806 A EP85904806 A EP 85904806A EP 85904806 A EP85904806 A EP 85904806A EP 0195807 B1 EP0195807 B1 EP 0195807B1
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EP
European Patent Office
Prior art keywords
width
guide device
distribution box
headbox
branch pipes
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
Application number
EP85904806A
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German (de)
English (en)
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EP0195807B2 (fr
EP0195807A1 (fr
Inventor
Elmer Weisshuhn
Alfred Bubik
Hans Dahl
Herbert Holik
Rüdiger KURTZ
Anton Zembrot
Wolf-Gunter Stotz
Werner Seider
Robert TRÖNDLE
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Sulzer Escher Wyss GmbH
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Sulzer Escher Wyss GmbH
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Publication date
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Application filed by Sulzer Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority to AT85904806T priority Critical patent/ATE47438T1/de
Publication of EP0195807A1 publication Critical patent/EP0195807A1/fr
Publication of EP0195807B1 publication Critical patent/EP0195807B1/fr
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Publication of EP0195807B2 publication Critical patent/EP0195807B2/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
    • D21F1/022—Means for injecting material into flow within the headbox
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/024—Details of the feed chamber
    • 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
    • D21F1/026—Details of the turbulence section
    • 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
    • D21F1/028—Details of the nozzle section
    • 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
    • D21F1/06—Regulating pulp flow

Definitions

  • the invention relates to a headbox device for a paper machine with a distribution box for distributing a stock suspension fed over the web width of the paper machine, a guide device for the stock suspension having a plurality of holes or channels and a subsequent nozzle space with an adjustable outlet gap for distributing the stock suspension over the Web width of the paper machine, the mass distribution over the web width of the paper machine being adjustable to a predetermined basis weight over the width of the paper machine and for which purpose branches and a collecting container for the adjustable removal of the stock suspension and optionally branches for the adjustable feeding of the suspension in the distribution box are provided on the distribution box.
  • Headbox devices of this type are known, for example, from US Pat. No. 4,087,321. They are used to feed a prepared pulp suspension to a paper machine and to distribute it over its entire web width in a certain way. This distribution of the stock suspension should take place in such a way that the paper web produced with the paper machine has certain properties across the web width, whereby usually an even basis weight (mass per unit area) after drying, an even moisture content, and an even fiber orientation over the entire web width are aimed for .
  • DE-A-2151 906 it is proposed to achieve a uniform speed and quantity of material also in the edge area by providing a gap that can be individually adjusted over the width on the distributor. Differences in pressure and cross flows in the outlet gap are also present here.
  • a device shows the inflow of additional liquid into a high-consistency headbox.
  • additional fibrous material is fed through a slot located at the bottom across the entire width.
  • German design step DE-AS 11 65 397 it is described how the air which separates at the top of the perforated roller headbox can also be discharged in a controlled manner.
  • the invention sets itself the task of eliminating the aforementioned disadvantages of the prior art and, in particular, of creating a headbox device for a paper machine with which, despite the change in the local mass flow rate necessary to set the desired transverse profiles of the basis weight, a flow state in the nozzle chamber and reached at the outlet gap, which is free of cross flows.
  • a paper web produced in this way should have a uniform fiber orientation across the web width.
  • the headbox device shown in Figure 1 has a distribution box 1, the cross section of which decreases in the direction of flow F of the stock suspension.
  • the substance suspension is e.g. to understand a mixture of fibers with additives for paper or cardboard manufacture, but also filler suspensions for paper coating.
  • a connecting pipe 2 is connected for supplying the stock suspension, and at the other, opposite end with the smaller cross section, a return line 3.
  • the distributor preferably has an approximately conical shape or can be designed as a truncated pyramid.
  • a guide device 5 is connected to a longitudinal side 4 of the distributor 1.
  • this can be designed as any guiding device customary in paper machine technology, for example, as shown in detail in the figure, as a step diffuser with step-widening parallel channels 6, e.g. according to CH 518406 (US 3725197).
  • a nozzle chamber 29 with an outlet gap 8 This being formed by two lips 7 or by a lip and a diaphragm mounted on the lip but freely movable relative to it.
  • the stock suspension now passes through the channels 6, the nozzle chamber 29 and the outlet gap 8 to the wire section of the paper machine.
  • At least one of the lips 7 or an orifice attached to it is provided with a plurality of adjustment devices 30 distributed over the width, with which the gap width can be adjusted individually over the width manually or by means of a regulating device in order to flow with the material suspension flow rate flowing out of the gap 8 Set the desired oven-dry basis weight profile of the paper web thus produced over the width.
  • the gap width is changed locally via adjusting devices 30 at the outlet gap 8
  • the local flow conditions such as pressure and Ge, also change in addition to the local mass flow and the basis weight profile speed in the nozzle area.
  • the result of the pressure differences are cross flows in the nozzle space, which are present up to the outlet gap 8 and act on the fiber storage on the sieve of the paper machine until the entire fiber structure is fixed in the sheet.
  • Pressure compensation can be carried out individually or in combination with various measures.
  • One possibility for pressure compensation over the web width of the machine is that, as shown in FIG. 1, on a longitudinal side of the distribution box 1, distributed over its length, a plurality of branches formed as branch lines 11, 12, 13 and 14 are connected to the inside of distributor 1 are connected.
  • controllable valves 15, 16, 17, 18, 19 are provided, by means of which the flow of the branch lines and the return line can be changed.
  • the branch lines 11, 12, 13 and 14 and the return line 3 are e.g. connected to a common manifold 20.
  • the material suspension branched off at the individual connection points of the branch lines and via the return line can be discharged via this.
  • the hydrostatic pressure profile in the distributor 1 changes from the location of the connection of the relevant branch lines.
  • the extent of the change in pressure can be adjusted by means of the valves 15, 16, 17, 18 and 19, so that by actuating these valves it is possible to set the required pressure curve over the length of the distributor or the width of the paper machine.
  • the shape of the distributor 1 can initially roughly predefine a specific pressure profile in the distributor, so that only the remaining deviations need to be corrected by actuating the valves.
  • the pressure setting at the various setting points can either be done manually, by means of a visual pressure indicator or after observing the paper web generated or according to the measurement results for certain paper properties, which were determined with suitable sensors across the width of the paper web, e.g. the basis weight, or the fiber orientation, or, as indicated in FIG. 1, with the aid of a control device 26 connected to the various measuring devices.
  • pressure measuring devices 21, 22, 23, 24 and 25 are provided along the flow direction F on the distributor 1, with which the hydrostatic pressure of the suspension in the distributor 1 or its course in the longitudinal direction is determined.
  • such pressure measuring devices can be designed and arranged as desired, wherein the pressure measurement can also take place in the nozzle area.
  • the measuring devices can be assigned to the individual valves and control them directly, or the measuring devices can supply their measured values to the control device 26 independently of the valves, which controls and adjusts the individual valves in a suitable manner, for example by means of a process computer, until as long as the desired pressure prevails at all measuring points.
  • the pressure profile specified by the control device 26 can be selected so that the pressure shows a desired course, for example is kept constant over the entire width, or certain edge corrections can be included, for example a somewhat higher pressure at both edges, to prevent pressure losses to compensate for the side walls.
  • the control device 26 can also be controlled by further sensors, not shown, which, for example, determine or measure the thickness, the basis weight, the curl (curl) or the fiber orientation of the paper produced along the width of the paper web and deliver corresponding additional control signals 28 by means of an additional pressure correction can be carried out or a pressure profile can be specified. If suitable operating personnel are available, such a control can also be carried out in a simpler manner manually or semi-automatically by observing the measured values of the individual measuring devices and adjusting accordingly.
  • the cross section of the branch lines 11, 12, 13 and 14 can be different, depending on the necessary correction. Likewise, the mutual distance between these branch lines can be selected differently. However, it is also readily possible to provide lines of the same diameter at the same distance from one another, in a number that ensures the necessary controllability.
  • the branch lines can also be used to supply additional stock suspension.
  • a feed line is to be provided instead of a return line 20.
  • This can be connected to the supply line 2, which is present anyway, or else to a supply line separate therefrom, the devices for flow control 15, 16, 17, 18, 19 being designed as suitable, controllable pumps. If necessary, however, only a part of the branches can be used to remove stock suspension, while the other branches can supply stock suspension.
  • the control members can be designed so that the flow direction and the flow rate can be controlled.
  • FIG. 2 shows a variant in two vertical sections, in which the distribution box 1 is connected to a collecting container 20 via connecting lines 11-14.
  • the height of the end of the connecting lines 11, 12, 13, 14, which goes into the collecting container 20, is adjustable, for example by sleeves 66 which can be displaced from the outside or by a telescopic design of the connecting lines which extends over at least part of the connecting lines. This creates a weir that is adjustable in height and thus makes the local pressure in the distributor individually adjustable.
  • Figure 3 shows a modification in which the connecting lines 11, 12, 13 are designed as slots with underlying, adjustable surface elements 60, 61 and 62, which serve as overflow weirs. By adjusting these surface elements, the effective weir height can be changed locally, so that a local pressure correction in the distribution box 1 also takes place here.
  • FIG. 4 Another possibility for influencing the pressure conditions is shown in FIG. 4, in which material is not drawn off via individual branch lines arranged across the machine width, but via an outlet slot 64 between distribution box 1 and collecting container 20, the outlet slot 64 covering the entire machine width goes.
  • a vertical overflow weir 63 extending over the entire width is also provided in the collecting container 20, the height of which can be adjusted locally over the width from the outside.
  • a change in the hydrostatic pressure in the distributor or in the nozzle can thereby be achieved simply by changing the weir height of the outlet slot 64.
  • a displaceable screen 65 can also be provided, by means of which the outlet slot 64 can be individually adjusted over the width.
  • branch lines or connecting slots can also be provided at other points of the headbox device, for example on the diffuser block 5, or in the nozzle chamber 29 immediately after the diffuser block or just before the outlet gap 8 or in between.
  • FIG. 5 shows an analog headbox device in vertical section, in which a distributor 1, a diffuser 5 with a row of parallel channels 6, and a nozzle chamber 29 with an outlet gap 8 are again provided.
  • the stock suspension flows from the nozzle chamber 29 onto the screen 32 of a paper machine which is guided over a breast roller 31.
  • the front part 33 of the upper delimitation lip 7 of the nozzle chamber 29 can be individually adjusted over the width by means of a joint 34 and by adjusting device 35 distributed over the width of the outlet gap 8.
  • the exit gap is delimited at the top by a diaphragm which is mounted on the upper lip, but is freely movable to a certain extent in relation to the upper lip. The gap width can then be changed using the adjustment devices attached to the panel.
  • the amount of suspension emerging from the gap can be controlled locally independently over the width.
  • the supply or discharge of fibrous suspension again takes place via branch lines 11 on the distributor 1 and also or optionally via branch lines 51 on the nozzle chamber 29, valves or pumps 36 or the designs shown in FIGS. 2-4 being provided for quantity regulation.
  • branch lines are provided either selectively or in combination on the distributor 1, on the diffuser block 5 or on the nozzle chamber 29. Changes in the pressure curve can be compensated for as close as possible to the point of origin.
  • the possibility is provided to provide branch lines 37 on the upper side of the distributor 1 or at another location. Instead, the branch lines can also be led directly out of the diffuser block 5.
  • lines 39 are in the first diffuser stage, lines 40 into the second diffuser stage immediately after the paragraph to the first stage, or lines 41 into the third diffuser stage immediately after the paragraph to the second stage.
  • supply lines can also be provided in the nozzle space 29 itself, for example lines 42 in the beginning of the nozzle space, directly behind the outlet openings 43 from the diffuser channels or lines 44, which are in the vicinity of the outlet gap 8 of the nozzle space 29 in the movable part 33 of the upper part Lippe flows out.
  • these lines can be used to add or remove water or white water with a lower consistency or suspension, depending on the requirements for the purpose of pressure control or to change the consistency.
  • Another possibility of regulating the pressure in the distributor 1 can be created by changing the distributor cross-section, e.g. through a movably designed rear wall 45 of the distributor.
  • the mobility can be achieved in that the rear wall 45 can be adjusted either manually or by means of a control device over the width of the distribution box, as a result of which the pressure profile in the distributor can be set, or in that the rear wall 45 is designed as a flexible and deformable membrane which is automatic , for example with the help of a pressure pad on the back so that the same pressure prevails over the entire width of the distribution box.
  • adjustment options 52 are necessary, which are to be provided immediately after the guide device, in front of the outlet gap or also in between, wherein the adjustment devices can also be attached at two and more positions in the machine direction.
  • adjustable screens 46 in front of the inlet openings 38 of the diffuser channels 6 or corresponding adjustable screens 47 in front of the outlet openings 43 of the diffuser channels.
  • adjustable screens 46 can consist of sliding elements, iris diaphragms, inflatable bodies or other elements.
  • Suspension or water can also be supplied via lines 50 directly at the inlet 38 of the channels, or the channels can be narrowed by controllable pressure bodies 27.
  • the increased pressure loss at the edges e.g. due to friction on the side walls 9 can be compensated for by changing the pressure loss of the guide device in the edge zones, e.g. is reduced, which is achieved by changing the passage cross section per unit width.
  • FIG. 7 shows an example of a diffuser block 5 with a plurality of rows of stacked diffusers arranged one above the other.
  • the cross section of the diffusers in the edge zone 48 on the side wall 9 is larger than in the adjoining central zone 49, so that the pressure loss in the stock suspension in the edge zone is somewhat smaller than in the middle and thus the increased Pressure losses in the peripheral zone can be compensated.
  • the individual rows of step diffusers are offset from one another, which means that a lower nozzle pressure is created in the edge zone 48 due to the diffusers missing relative to the center 49.
  • a larger material flow per unit of width is achieved in the edge zone by making additional bores or by reducing the pressure loss of the individual element of the guide device in the edge area, so that a pressure correction is also possible here.
  • fundamental defects in the distribution board design or at another location on the paper machine can also be compensated for by changing and adapting the hole diameter or pressure loss across the web width.
  • the branch lines 11 connected to the collecting line 20 can advantageously also be connected at the highest point of the distributor 1, which ensures that any air excretions can be safely removed.
  • the connection for the diffuser 5 can be provided, so that the pressure control takes place in the immediate vicinity of the inlet of the diffuser.
  • the collecting line can also be guided directly along the distributor 1, so that the branches 11 are formed by openings which connect the distributor 1 and the collecting line 20.
  • FIG. 10 shows an example in which the diffuser is designed as a guide device which is known per se and which connects a distributor 1 with the lips 7 and an outlet gap 8 and which has two pipe systems 53 and which are connected in series and are separated by a space 55 bypassing the suspension 54 has.
  • This intermediate space 55 is connected through branch openings 56 with an independently controllable or adjustable cross section to an overflow line 57, which at the same time shows a damping effect.
  • FIG. 11 shows an analogous example in which controllability is achieved by means of slide 58. that change the cross section of the branch openings.
  • the openings 59 can optionally also be brought forward to the beginning of the nozzle chamber 29.

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Abstract

Dans un système de caisse de tête pour une machine à papier, caractérisé par une distribution réglable de la pâte sur la largeur de la bande, le passage de la pâte dans l'écartement des rouleaux de sortie (8) est commandé de manière que la distribution des fibres sur la largeur de la bande ait également un profil voulu en ce qui concerne l'orientation et la quantité des fibres. A cet effet, l'écoulement de la pâte est commandé de façon à ce qu'en cas de changement de la distribution de la pâte sur la largeur de la bande, la composante horizontale de la direction d'écoulement dans l'écartement de sortie reste, à tout moment, et en tout endroit, orientée dans la direction de la machine, ce qui permet d'éviter tout écoulement transversal et d'obtenir un profil prédéterminé dans l'écartement de sortie (8).

Claims (17)

1. Système de caisse de tête pour machine à papier, avec une caisse de distribution (1 ) pour répartir une suspension de matière, amenée à ladite caisse, sur toute la largeur de bande de la machine à papier, avec un dispositif de guidage (5) de ladite suspension de matière présentant une pluralité de trous ou de canaux (6) et une chambre à tuyères (29) disposée à la suite, avec une fente d'écoulement (8) réglable pour répartir la suspension de matière sur toute a largeur de bande de la machine à papier, la répartition massique selon la largeur de bande étant réglable en vue d'un gram- mage prédéterminé sur toute la largeur de la machine à papier, dans lequel sont prévues à cet effet sur la caisse de distribution (1 ) des dérivations (11-14) et un collecteur (20) pour l'évacuation réglable de la suspension de matière, et, le cas échéant, des dérivations (37) pour amener, de manière réglable, de la suspension dans la caisse de distribution (1), caractérisé en ce que, pour régler l'écoulement de la suspension de matière dans le système de caisse de tête dans le but que, même en cas de changement de la répartition massique par modification des paramètres d'exploitation, la composante horizontale, vue dans le sens de la largeur de bande de la machine à papier, du sens d'écoulement de la suspension de matière à la fente d'écoulement (8), soit partout parallèle dans le sens de la machine, et que la vitesse d'écoulement dans la fente d'écoulement (8) vue dans le sens de la largeur de la machine soit uniforme, non seulement dans la caisse de distribution (1), mais aussi dans le système de caisse de tête entre la caisse de distribution (1 ) et la fente d'écoulement (8) sur toute la largeur du système de caisse de tête, sont prévus, répartis sélectivement sur la largeur du système de caisse de tête, d'autres dérivations (39, 40, 41, 42, 44, 50) pour l'évacuation locale ou l'apport local, réglables, de suspension de matière ou d'eau, et/ou des dispositifs (27, 45, 46, 47, 51, 52, 56, 58, 59) pour modifier ou conformer localement le profil d'écoulement et le profil de pression dans les divers espaces respectifs du système de caisse de tête, tandis que l'écoulement de la suspension de matière est réglé en modifiant le profil d'écoulement dans la caisse de distribution et/ou dans le dispositif de guidage (5) et/ou dans la chambre à tuyères (29) ou bien par apport ou par évacuation de suspension de matière et/ou par apport d'eau concernant la caisse de répartition (1 ), le dispositif de guidage (5) et/ou concernant la chambre à tuyères (29) par mise en oeuvre combinée, selon les besoins, des moyens prévus localement à cet effet, les uns avec les autres.
2. Système selon la revendication 1, caractérisé en ce que les dérivations (11-14) disposées sur la caisse de distribution (1 ) dépassent, par leurs extrémités opposées à la caisse de distribution (1 ), à l'intérieur du collecteur (20), la longueur de leur partie dépassant à l'intérieur du collecteur (20) étant modifiable.
3. Système selon la revendication 1, caractérisé en ce que les dérivations (11-14, 64) sur la caisse de distribution (1 ) sont conformées avec au moins une ouverture et en ce qu'est prévu dans le collecteur (20), sur les ouvertures, un déversoir de trop-plein (60, 61, 62) réglable localement en hauteur.
4. Système selon la revendication 1, caractérisé en ce que les dérivations sur la caisse de distribution (1 ) consistent en une fente (64) s'étendant longitudinalement entre la caisse de distribution (1 ) et le collecteur (20), la largeur de cette fente étant réglable localement.
5. Système selon la revendication 1, caractérisé en ce que les dérivations (39-41 ) et les dispositifs (56, 58) sont raccordés au dispositif de guidage (5,55).
6. Système selon la revendication 1, caractérisé en ce que les dérivations (39) sont raccordées au premier gradin d'un canal du dispositif de guidage (5), ce canal étant conformé sous a forme d'un diffuseur à gradins.
7. Système selon la revendication 1, caractérisé en ce que les dérivations (40, 41 ) sont raccordées à un deuxième gradin ou à un gradin suivant d'un canal du dispositif de guidage (5) conformé sous la forme d'un diffuseur à gradin, directement après un gradin.
8. Système selon la revendication 1, caractérisé en ce que les dérivations (59) sont raccordées à la chambre à tuyères (29).
9. Système selon la revendication 1, caractérisé en ce qu'une installation de réglage (26) est agencée pour régler la pression sur la largeur du système de caisse de tête selon un profil de pression prédéterminé dans la caisse de distribution (1 ).
10. Système selon la revendication 1, caractérisé en ce que les dispositifs (27) sont prévus pour modifier le profil d'écoulement des canaux (6) du dispositif de guidage (5).
11. Système selon la revendication 1, caractérisé en ce que les dérivations (50) sont prévues pour l'apport d'eau aux entrées (38) des canaux (6).
12. Système selon la revendication 1, caractérisé en ce que les dispositifs (46, 47) sont prévus en avant des ouvertures d'entrée (38) du dispositif de guidage (5), ou après ses ouvertures de sortie (43), pour un réglage ajustable du débit à travers le dispositif de guidage (5).
13. Système selon la revendication 1, caractérisé en ce que la section des canaux du dispositif de guidage (5) est conformée de manière différente sur la largeur de bande.
14. Système selon la revendication 13, caractérisé en ce que les canaux du dispositif de guidage (5) présentent, dans les zones marginales (48) du système, une perte de charge autre que dans la zone médiane (49).
15. Système selon la revendication 1, caractérisé en ce que le dispositif de guidage (5) présente dans la zone marginale le même nombre de canaux (6) par unité de largeur, tandis que les sections des canaux dans la zone marginale (48) sont autres que dans la zone médiane (49)..
16. Système selon la revendication 14, caractérisé en ce que dans la zone marginale (48) des forures supplémentaires sont prévues en tant que canaux dans le dispositif de guidage (5).
17. Système selon la revendication 1, caractérisé en ce que, au moyen du dispositif (45 ou 52) la géométrie des caisses de distribution (1, 55) et/ou de la chambre à tuyères (29) est modifiable localement de façon individuelle sur toute la largeur du système de caisse de tête, pour modifier et/ou conformer e profil d'écoulement et le profil de pression dans les chambres (1,29).
EP85904806A 1984-09-19 1985-09-16 Systeme de caisse de tete pour machine a papier Expired - Lifetime EP0195807B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85904806T ATE47438T1 (de) 1984-09-19 1985-09-16 Stoffauflauf-vorrichtung fuer eine papiermaschine.

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CH448984 1984-09-19
CH4489/84 1984-09-19
CH915/85 1985-02-28
CH91585 1985-02-28
PCT/EP1985/000473 WO1986001844A1 (fr) 1984-09-19 1985-09-16 Systeme de caisse de tete pour machine a papier, et procede pour son utilisation

Publications (3)

Publication Number Publication Date
EP0195807A1 EP0195807A1 (fr) 1986-10-01
EP0195807B1 true EP0195807B1 (fr) 1989-10-18
EP0195807B2 EP0195807B2 (fr) 1994-07-13

Family

ID=25686098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85904806A Expired - Lifetime EP0195807B2 (fr) 1984-09-19 1985-09-16 Systeme de caisse de tete pour machine a papier

Country Status (5)

Country Link
US (3) US4898643A (fr)
EP (1) EP0195807B2 (fr)
DE (1) DE3514554C3 (fr)
FI (1) FI90359B (fr)
WO (1) WO1986001844A1 (fr)

Families Citing this family (86)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687548A (en) * 1984-10-31 1987-08-18 Valmet Oy Method and apparatus for controlling distortion of fibre orientation in a paper web
FI73766C (fi) * 1985-12-13 1987-11-09 Ahlstroem Oy INLOPPSLAODA FOER PAPPERSMASKIN. SIIRRETTY PAEIVAEMAEAERAE-FOERSKJUTET DATUM PL 14 ç 17.12.85.
CH671418A5 (fr) * 1987-02-23 1989-08-31 Escher Wyss Gmbh
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DE3514554C3 (de) 1998-01-08
US4898643A (en) 1990-02-06
FI90359B (fi) 1993-10-15
FI861944A7 (fi) 1986-05-09
FI861944A0 (fi) 1986-05-09
EP0195807B2 (fr) 1994-07-13
DE3514554A1 (de) 1986-03-27
DE3514554C2 (de) 1994-06-16
US4888094A (en) 1989-12-19
US4897158A (en) 1990-01-30
WO1986001844A1 (fr) 1986-03-27
EP0195807A1 (fr) 1986-10-01

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