EP0860546B1 - Boíte aspirante et partie de pressage d'une machine à papier ainsi que procédé pour déshumidifier une section de la toile d'une machine à papier - Google Patents

Boíte aspirante et partie de pressage d'une machine à papier ainsi que procédé pour déshumidifier une section de la toile d'une machine à papier Download PDF

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Publication number
EP0860546B1
EP0860546B1 EP97116756A EP97116756A EP0860546B1 EP 0860546 B1 EP0860546 B1 EP 0860546B1 EP 97116756 A EP97116756 A EP 97116756A EP 97116756 A EP97116756 A EP 97116756A EP 0860546 B1 EP0860546 B1 EP 0860546B1
Authority
EP
European Patent Office
Prior art keywords
section
web
suction
suction apparatus
web section
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
EP97116756A
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German (de)
English (en)
Other versions
EP0860546A2 (fr
EP0860546A3 (fr
Inventor
Karl Dr. Steiner
Hans Prinzing
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP0860546A2 publication Critical patent/EP0860546A2/fr
Publication of EP0860546A3 publication Critical patent/EP0860546A3/fr
Application granted granted Critical
Publication of EP0860546B1 publication Critical patent/EP0860546B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/12—Drying
    • 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
    • D21F1/52—Suction boxes without rolls

Definitions

  • the present invention relates to a suction device for a paper machine, with a plant section, to plant a web section of the paper machine and with a suction box, to which a vacuum can be applied in order to close the web section drain.
  • the invention further relates to a press section of a paper machine, with at least one fabric sheet into the moisture is pressed from a paper web to be produced, one Suction device arranged on a web section of the fabric web is to subsequently drain the fabric web.
  • Suction devices are mainly used in paper machines used, webs of the paper machine with or without overlying paper web to suck up the fabric web and / or to dehumidify the paper web. But they are also used to take over the paper web from another fabric web.
  • a fabric web is said to be typically a felt sheet can be understood.
  • a Suction device for a paper machine, a press section a paper machine and a method for vacuuming a Specify web section of a paper machine the friction between a contact section on the suction device and the Track section is reduced without using specialist personnel to have to.
  • suction device is a control device and one so controlled by the control device Relief mechanism has that the suction device in Operation with negative pressure applied to the web section is relieved, so that the friction between the web section and the plant section is reduced.
  • Suction device released is the task through the use of the invention Suction device released.
  • the task is through the step solved the suction device with or after putting on the Relieve negative pressure against the web section, so that the track section with reduced friction on the Plant section is guided along without the Path section detaches from the contact section.
  • the suction device opposite the web section to relieve only when there is a vacuum on this Device is applied, the friction is reduced without that it is necessary to touch the track section by hand against the Press section of the suction device.
  • Under a Relief mechanism in this context should be of every kind be understood by mechanism that allows the through the normal force caused by the negative pressure between the system section and to reduce track section, so that also reduces the friction.
  • the relief mechanism is included in other words a mechanism that is one of these normal forces opposite force is generated. It is understood that the Control device for controlling the relief mechanism Can be part of the higher-level paper machine control.
  • control device in the present context Any kind of facility can be understood that is the controller allows the normal force between the system section and Only reduce the web section if there is already a vacuum is applied to the suction device, if not more there is the possibility that the track section again from the plant section resolves. This can safely avoid that the suction device sucks in air and its intended Can no longer function. Due to the lower friction is less power to drive the paper machine required.
  • the relief mechanism preferably acts on the suction device force controlled to this opposite the web section to relieve.
  • the web section detaches from the contact section when falling below a certain difference between the Normal force and that generated by the relief mechanism Force. Because in this embodiment this difference is direct is adjustable, the difference between the normal force and the force generated by the relief mechanism be maximized. On the one hand, this makes it very low Friction reached. On the other hand, it can be safely ruled out that the web section detaches from the contact section.
  • the Relief mechanism as an adjustment mechanism for the suction device formed, the control device the adjustment mechanism activated in operation with negative pressure applied, that the suction device relative to the web section by one such amount is withdrawn that the frictional force between the Plant section and the web section is reduced without the web section separates from the contact section.
  • the generation takes place against the Normal force directed force in that the suction device through the adjustment mechanism opposite the web section straight roller connection is lifted off.
  • the adjustment mechanism is preferably by a mechanism formed by means of which the suction device for maintenance purposes can be lifted off the track section.
  • Such maintenance mechanisms are known and are used to to lift the suction device in relation to the web section in order to to be able to maintain or clean the suction device.
  • this mechanism for the adjustment mechanism the paper machine can be built much more compact, since no additional mechanism must be installed. It is alone necessary, the control device with the existing one To couple the maintenance mechanism so that the maintenance mechanism in operation with negative pressure applied by a certain amount is lifted off to the friction between the web section and to reduce the plant section.
  • the adjustment mechanism is in the lifted position can be locked or self-holding.
  • the adjustment mechanism is particularly easy to control, for example by an electric motor, and there a spindle mechanism on the other hand is self-retaining.
  • the adjustment mechanism a hydraulic or pneumatic piston / cylinder arrangement. In this The catch could fall through in the off position flipping a valve.
  • the Adjustment mechanism on both sides of the web section the suction device, wherein the contact section with a concave crowning is provided.
  • the convex deflection becomes due to the concave crowning balanced, which is generated by the adjustment mechanism on both sides of the web section on the suction device attacks the normal force generated by the negative pressure however acts in the area of the track section.
  • the control device preferably controls the relief mechanism depending on the operating parameters of the paper machine on.
  • These operating parameters can be the web tension, the differential pressure at the suction device, the type of fabric, the web runtime, the suction device length, by just a few To name examples.
  • the relief mechanism preferably has a pressure-driven one Bellows arrangement on.
  • the bellows arrangement is a row of individual bellows distributed across the web running direction are arranged.
  • the bellows arrangement on the suction device applied force evenly over the length of the suction device distributed. It is therefore avoided that the suction device deflects transversely to the web running direction, so that one across the width uniform suction power of the web section is achieved.
  • the System section on two squeegees, between which one Suction opening is formed, the squeegees around Are inclined to each other.
  • the plant section two Has suction strips between which a suction opening is formed and if the squeegees on their outer edges are rounded.
  • the System section on two squeegees, between which one Suction opening is formed, the squeegees in relation are concavely curved on the track section.
  • the concave curvature is preferably at the Adjusted radius of the roller.
  • Fig. 1 is a section of a press section Paper machine generally designated by the reference number 10.
  • the paper web 12 runs on the bottom felt 14 in the press nip 18 a.
  • the top felt 16 is around a series of felt guide rolls 24 out.
  • In the press nip 18 is by means of the press rolls 20, 22 moisture present in the paper web in the felts 14, 16 pressed.
  • To drain the upper felt 16 is the Upper felt 16 around two felt guide rollers arranged downstream of the press nip 18 24 out, between which a suction device is arranged, which is generally indicated by reference number 30.
  • the suction device 30 has a contact section 34 for contact on the web section formed between the two felt guide rollers 24 32 of the upper felt 16 and a suction box 36, to which a vacuum can be applied.
  • the suction device 30 can what the contact section 34 and the suction box 36, of a conventional type, so that there is no detailed description here becomes.
  • a relief mechanism 38 provided by a control device 40 is controlled.
  • the relief mechanism 38 acts in the most general case that he on the arrangement of the suction box 36 and the system section 34 exerts a force. That through the relief mechanism 38 generated force acts against a normal force caused by the vacuum applied to the suction box 36 is generated and which presses the web section 32 against the contact section 34. By the counterforce generated by the relief mechanism 38 there is a lower resulting force between Track section 32 and contact section 34 acts so that the friction is reduced between these two parts. Through this Relief of the suction device 30 with respect to the web section 32 will therefore wear both on the felt 16 as well reduced on the contact section 34.
  • the key, as I said, is that through the relief mechanism 38 one of the normal force generated by the negative pressure counteracting force is generated. As a rule, it is for this necessary, the suction device 30 opposite the web section 32 to raise.
  • the lifting can be perpendicular to the web running direction or at an angle to this.
  • the suction device 30 opposite the web section 32 by relieving a piston force for example, the suction device 30 is not significantly opposite the web section 32 is raised.
  • Fig. 1 there is also a sensor 42 for the web tension indicated, which is connected to the control device 40.
  • the control device 40 With this configuration it is possible to discharge the Suction device 30 in relation to the web section 32 in dependence to regulate from the web tension.
  • the function of the relief mechanism 38 depending set or regulate other operating parameters. These operating parameters can be, for example: the type of felt used, the felt runtime, the suction device length, the differential pressure at the suction device.
  • the control device 40 can be a separate, decentralized one Control device or as part of a central, not Paper machine control system shown may be provided.
  • FIGS. 2 and 3 show an embodiment of the invention shown, in which the relief mechanism 38 as an adjustment mechanism 44 is formed.
  • the adjustment mechanism 44 has a lever 46, which at a pivot point 48 on the fixed Chair of the paper machine is pivotally mounted. On middle part of the lever 46 is connected via a fulcrum 52 connected to the suction box 36. The free end of the lever 46 is coupled to a drive 54, by means of which the lever the pivot point 48 can be pivoted around.
  • the drive 54 is with the control device (not shown in FIGS. 2 and 3) 40 connected.
  • the Suction device 30 Before applying a vacuum to the suction box 36 the Suction device 30 is the lever 46 in one Position that the contact section 34 on the one straight roller connection forming web section 32 abuts. With or after the application of the vacuum, the lever 46 is an angle 56 pivots, taking the suction device 30 with it.
  • the vacuum does not release the web section 32 from that Contact section 34, so that the web section 32 as a result is deflected by an amount 58.
  • the by the deflection of the web section 32 produces a tensile stress Force 60, against the normal force generated by the vacuum acts with which the web section 32 against the contact section 34 is pressed. This results in between the track section 32 and the contact section 34 a lower friction, what overall, less wear and less Power consumption of the paper machine leads.
  • the part of the adjustment mechanism formed by the lever 46 44 can be part of a conventional, in many paper machines already existing maintenance mechanism, by means of which the suction device for maintenance or cleaning purposes
  • the paper machine 10 comes to a standstill from the web section 32 can be lifted off.
  • the realization of the Adjustment mechanism 44 only one drive 54 with one suitably programmed control device 40 can be provided.
  • FIG. 4 shows a further embodiment of a suction device 64 shown.
  • the relief mechanism 38 is only in FIG. 4 indicated schematically.
  • the suction device 64 has two offset in the web running direction arranged suction strips 66, 68, between which one Suction opening 69 is formed.
  • the suction strips 66, 68 are inclined at an angle 70 to each other.
  • the outer edges 72 of the suction strips 66, 68 are each rounded.
  • the angular arrangement of the two suction strips 66, 68 reaches that part running to the suction device 64 of the web section 32 and that of the suction device 64 running part of the web section 32 when the suction device is lifted off 64 aligned parallel to the suction strips 66, 68 are. This will reduce the friction between the squeegees 66, 68 and the track section 32 due to the flat system further decreased.
  • FIG. 5 Another embodiment of a suction device is shown in FIG. 5 generally indicated with the reference number 76.
  • the relief mechanism 38 is again only shown schematically.
  • the contact section of the suction device 76 consists of two Suction strips 80, 82, between which a suction opening 83 is trained.
  • the bottom of the squeegees 80, 82 is concave with a radius that corresponds to the radius of a corresponds to ventilated roller 78 around which the web section 32 is looped around in this embodiment.
  • the suction device 76 in particular for the suction of Track sections that wrap around rollers.
  • arrows 86 indicate how the negative pressure is applied to the suction box 36 of the suction device 30.
  • the relief mechanism 38 is through two piston / cylinder assemblies 90 formed on both sides of the suction box 36 of the track section 32 attack.
  • an adjustment mechanism 44 is shown by two spindle assemblies 92 is formed on both sides of the Attack web section 32 (not shown in Fig. 7).
  • a motor 94 is assigned to each of the spindle mechanisms 32.
  • FIG. 7 also shows that the contact section 34 with a crown extending transversely to the web section 32 96 is provided. Due to the lateral attack of the spindle mechanisms 92, the suction device 30 is applied Vacuum 86 bent. This deflection is raised in the Condition compensated by the crowning 96, so that a flat contact of the plant section on the web section 32 is guaranteed.
  • the crowning 96 is in FIG. 7 For illustration purposes, exaggerated.
  • the relief mechanism is 38 formed by a bellows arrangement 98.
  • the bellows arrangement 98 is between the suction box of the suction device 30 and the Chair of the paper machine 10 on the plant section 34 arranged opposite side.
  • the bellows assembly 98 is driven by vacuum to the suction device compared to the (not shown in Fig. 8) Lift off section 32.
  • the bellows arrangement 98 via a channel 100 with the source for the Vacuum 86 connected to the suction device 30 for Suction of the web section 32 is created.
  • the bellows arrangement 98 is controlled automatically by the bellows arrangement via channel 100 is connected to the vacuum 86.

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  • Paper (AREA)
  • Advancing Webs (AREA)

Claims (15)

  1. Dispositif d'aspiration (30 ; 64 ; 76) pour une machine à papier (10), comprenant une portion de contact (34 ; 66 ; 68 ; 80 ; 82) destinée à s'appliquer contre une portion de bande (32) et comprenant une caisse aspirante (36), à laquelle on peut appliquer une dépression (86) pour déshumidifier la portion de bande (32), la bande (32) étant pressée par la dépression (86) contre la portion de contact (34 ; 66 ; 68 ; 80 ; 82), caractérisé en ce que
    le dispositif d'aspiration (30 ; 64 ; 76) présente un dispositif de commande (40) et un mécanisme de déchargement (38) commandé par le dispositif de commande (40), qui réduit une force normale provoquée par la dépression entre la portion de contact (34 ; 66 ; 68 ; 80 ; 82) et la portion de bande (32) en produisant une force opposée, de telle sorte que le dispositif d'aspiration (30 ; 64 ; 76) soit déchargé en fonctionnement, lorsque la dépression est appliquée (86), par rapport à la portion de bande (32), de sorte que le frottement entre la portion de bande (32) et la portion de contact (34 ; 66 ; 68 ; 80 ; 82) soit réduit, sans que la portion de bande (32) se détache de la portion de contact (34 ; 66 ; 68 ; 80 ; 82).
  2. Dispositif d'aspiration selon la revendication 1, caractérisé en ce que le mécanisme de déchargement (38) agit de manière commandée par force sur le dispositif d'aspiration (30 ; 64 ; 76) afin de décharger celui-ci par rapport à la portion de bande (32).
  3. Dispositif d'aspiration selon la revendication 1, caractérisé en ce que le mécanisme de déchargement (38) est réalisé en tant que mécanisme de réglage (44) pour le dispositif d'aspiration (30 ; 64 ; 76), le dispositif de commande (40) commandant le mécanisme de réglage (44) en fonctionnement lorsque la dépression (86) est appliquée de telle sorte que le dispositif d'aspiration (30 ; 64 ; 76) soit soulevé par rapport à la portion de bande (32) d'une mesure (58) telle que la force de frottement entre la portion de contact (34 ; 66 ; 68 ; 80 ; 82) et la portion de bande (32) soit réduite sans que la portion de bande (32) ne se détache de la portion de contact (34 ; 66 ; 68 ; 80 ; 82).
  4. Dispositif d'aspiration selon la revendication 3, caractérisé en ce que le mécanisme de réglage (44) est formé par un mécanisme au moyen duquel le dispositif d'aspiration (30 ; 64 ; 76) peut être soulevé de la portion de bande (32) à des fins d'entretien.
  5. Dispositif d'aspiration selon la revendication 3 ou la revendication 4, caractérisé en ce que le mécanisme de réglage (44) peut être encliqueté ou maintenu automatiquement dans la position soulevée.
  6. Dispositif d'aspiration selon l'une quelconque des revendications 3 à 5, caractérisé en ce que le mécanisme de réglage (44) vient en prise des deux côtés de la portion de bande sur le dispositif d'aspiration (30 ; 64 ; 76) et en ce que la portion de contact (34) est pourvue d'un bombement concave.
  7. Dispositif d'aspiration selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le dispositif de commande (40) commande le mécanisme de déchargement (38) en fonction de paramètres de fonctionnement de la machine à papier (10).
  8. Dispositif d'aspiration selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le mécanisme de déchargement (38) présente un agencement de soufflet (98) commandé par pression.
  9. Dispositif d'aspiration selon la revendication 8, caractérisé en ce que l'agencement de soufflet (98) vient en prise du côté opposé à la portion de contact (34 ; 66 ; 68 ; 80 ; 82) sur le dispositif d'aspiration (30 ; 64 ; 76) et est entraíné par la dépression (86) qui est appliquée au dispositif d'aspiration (30 ; 64 ; 76).
  10. Dispositif d'aspiration selon la revendication 8 ou la revendication 9, caractérisé en ce que l'agencement de soufflet (98) présente une rangée de soufflets individuels (102) qui sont répartis transversalement à la direction d'avance de la bande.
  11. Dispositif d'aspiration selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la portion de contact (66, 68) présente deux barres d'aspiration (66, 68) entre lesquelles est réalisée une ouverture d'aspiration (69), et en ce que les barres d'aspiration (66, 68) sont inclinées d'un angle (70) l'une par rapport à l'autre.
  12. Dispositif d'aspiration selon l'une quelconque des revendications 1 à 11, caractérisé en ce que la portion de contact (66, 68) présente deux barres d'aspiration (66, 68) entre lesquelles est réalisée une ouverture d'aspiration (69) et en ce que les barres d'aspiration (66, 68) sont arrondies au niveau de leurs arêtes extérieures (72).
  13. Dispositif d'aspiration selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la portion de contact (80, 82) présente deux barres d'aspiration (80, 82) entre lesquelles est réalisée une ouverture d'aspiration (83), et en ce que les barres d'aspiration (80, 82) ont une courbure concave par rapport à la portion de bande (32, 78).
  14. Section de pressage (10) d'une machine à papier, comprenant au moins une bande de tissu (14, 16) dans laquelle l'humidité est extraite par pressage hors d'une bande de papier à fabriquer (12), un dispositif d'aspiration (30 ; 64 ; 76) étant disposé sur une portion de bande (32) de la bande de tissu (14, 16), afin de déshydrater ensuite la bande de tissu (14, 16), caractérisée en ce que le dispositif d'aspiration est un dispositif d'aspiration (30 ; 64 ; 76) selon l'une quelconque des revendications 1 à 13.
  15. Procédé d'aspiration d'une portion de bande (32) d'une machine à papier (10), comprenant les étapes suivantes :
    agencement d'une portion de contact (34 ; 66 ; 68 ; 80 ; 82) d'un dispositif d'aspiration (30 ; 64 ; 76) sur la portion de bande (32) ;
    application d'une dépression (86) sur le dispositif d'aspiration (30 ; 64 ; 76) afin d'aspirer la portion de bande (32) et
    mise en marche de la machine à papier (10) de telle sorte que la portion de bande (32) soit guidée le long de la portion de contact (34 ; 66 ; 68 ; 80 ; 82), la bande (32) étant pressée par la dépression (86) contre la portion de contact (34 ; 66 ; 68 ; 80 ; 82),
    caractérisé par l'étape consistant à décharger le dispositif d'aspiration (30 ; 64 ; 76) avec ou après l'application de la dépression (86) par rapport à la portion de bande (32) avec un mécanisme de déchargement (38) commandé par un dispositif de commande (40), qui réduit la force normale provoquée par la dépression entre la portion de contact (34 ; 66 ; 68 ; 80 ; 82) et la portion de bande (32) en produisant une force opposée, de sorte que la portion de bande (32) soit guidée le long de la portion de contact (34 ; 66 ; 68 ; 80 ; 82) avec un frottement réduit, sans que la portion de bande (32) ne se détache de la portion de contact (34 ; 66 ; 68 ; 80 ; 82).
EP97116756A 1996-11-26 1997-09-26 Boíte aspirante et partie de pressage d'une machine à papier ainsi que procédé pour déshumidifier une section de la toile d'une machine à papier Expired - Lifetime EP0860546B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19648850A DE19648850A1 (de) 1996-11-26 1996-11-26 Saugvorrichtung und Pressenpartie einer Papiermaschine sowie Verfahren zum Besaugen eines Bahnabschnitts einer Papiermaschine
DE19648850 1996-11-26

Publications (3)

Publication Number Publication Date
EP0860546A2 EP0860546A2 (fr) 1998-08-26
EP0860546A3 EP0860546A3 (fr) 1999-06-09
EP0860546B1 true EP0860546B1 (fr) 2003-11-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97116756A Expired - Lifetime EP0860546B1 (fr) 1996-11-26 1997-09-26 Boíte aspirante et partie de pressage d'une machine à papier ainsi que procédé pour déshumidifier une section de la toile d'une machine à papier

Country Status (4)

Country Link
US (1) US6027613A (fr)
EP (1) EP0860546B1 (fr)
AT (1) ATE254210T1 (fr)
DE (2) DE19648850A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10241181A1 (de) * 2002-09-05 2004-03-18 Voith Paper Patent Gmbh Einrichtung zur Filzkonditionierung

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1719969A (en) * 1928-01-19 1929-07-09 Dupuis Conrade Hector Screen-cleaning device for paper-making machines
US2544572A (en) * 1947-11-18 1951-03-06 Vickerys Ltd Felt conditioner for use in papermaking
US3420736A (en) * 1965-09-01 1969-01-07 Carborundum Co Felt cleaner for paper making machine
US3595744A (en) * 1965-12-22 1971-07-27 Helge Natanael Skoldkvist Pulp-forming machine
US3472733A (en) * 1966-04-18 1969-10-14 Cons Paper Inc Paper-forming suction cylinder roll with arcuate stock delivery nozzle and porous belt in wrapped engagement therewith
US3841910A (en) * 1970-04-13 1974-10-15 Bird Machine Co Liquid extracting apparatus and method
US4329201A (en) * 1979-12-06 1982-05-11 Albany International Corp. Constant vacuum felt dewatering system
JP2808491B2 (ja) * 1990-12-19 1998-10-08 三菱重工業株式会社 抄紙機のツインワイヤフォーマ
DE4219292A1 (de) * 1992-06-12 1993-12-16 Escher Wyss Gmbh Doppelsiebformer
WO1994009207A2 (fr) * 1992-10-14 1994-04-28 Valmet Paper Machinery Inc. Dispositif de formation a double fil avec boites d'aspiration pour le drainage simultane
DE4305493A1 (de) * 1993-02-23 1994-08-25 Voith Gmbh J M Saugvorrichtung zum Besaugen eines endlosen Bandes mit selbstjustierender Sauglänge
FI1215U1 (fi) * 1993-12-03 1994-02-21 Valmet Paper Machinery Inc Anlaeggning i samband med styrningen av en vira

Also Published As

Publication number Publication date
US6027613A (en) 2000-02-22
DE19648850A1 (de) 1998-05-28
EP0860546A2 (fr) 1998-08-26
DE59710993D1 (de) 2003-12-18
EP0860546A3 (fr) 1999-06-09
ATE254210T1 (de) 2003-11-15

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