EP0509199B1 - Press section for a papermachine - Google Patents

Press section for a papermachine Download PDF

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Publication number
EP0509199B1
EP0509199B1 EP19920102028 EP92102028A EP0509199B1 EP 0509199 B1 EP0509199 B1 EP 0509199B1 EP 19920102028 EP19920102028 EP 19920102028 EP 92102028 A EP92102028 A EP 92102028A EP 0509199 B1 EP0509199 B1 EP 0509199B1
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EP
European Patent Office
Prior art keywords
pressing
web
characterised
pressing point
felt
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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
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EP19920102028
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German (de)
French (fr)
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EP0509199A1 (en
EP0509199B2 (en
Inventor
Heinz Braun
Peter Mirsberger
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Voith Sulzer Papiermaschinen GmbH
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Voith Sulzer Papiermaschinen GmbH
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Filing date
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Priority to DE4112355 priority Critical
Priority to DE19914112355 priority patent/DE4112355A1/en
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Publication of EP0509199A1 publication Critical patent/EP0509199A1/en
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Publication of EP0509199B1 publication Critical patent/EP0509199B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6429677&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0509199(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Publication of EP0509199B2 publication Critical patent/EP0509199B2/en
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/04Arrangements thereof
    • D21F3/045Arrangements thereof including at least one extended press nip
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/04Arrangements thereof

Description

  • Die Erfindung betrifft eine Pressenpartie einer Papiermaschine gemäß dem Oberbegriff des Anspruches 1 (US-A- 4 257 844). The invention concerns a press section of a paper machine according to the preamble of claim 1 (US-A-4,257,844).
  • Pressenpartien dieser Art haben den entscheidenden Vorteil, daß durch Verwendung von Pressen mit, in Bahnlaufrichtung gesehen, verlängerter Preßlänge eine relativ lange Zeit zum Auspressen der Flüssigkeit aus der Bahn zur Verfügung steht. Press sections of this type have the important advantage that, as seen by the use of presses, in the web running direction, pressing length is extended a relatively long time for squeezing the liquid from the alley. Auf diese Weise kann eine solche Pressenpartie mit Wenig Preßstellen auskommen und dennoch, auch bei schnellem Durchlauf der Papierbahn, einen hohen Entwässerungseffekt erzielen. In this way, such a press section can with little press nips get along and yet, even with fast throughput of the paper web, achieve a high drainage effect. Die an sich bekannten Pressen mit verlängertem Preßspalt sind häufig so aufgebaut, daß eine Preßwalze mit flexiblem Mantel versehen ist, der von innen durch ein im wesentlichen nur radial bewegliches Preßelement gegen eine starre Gegenwalze gedrückt wird, wobei sich der flexible Mantel im Bereich des Preßspaltes an die starre Gegenwalze anschmiegen kann. The known presses with an extended press nip are often constructed so that a press roll is provided with a flexible sheath which is pressed from the inside by a substantially only radially movable pressing member against a rigid counter-roller, wherein the flexible sheath in the region of the press nip in can cling to the rigid backing roll. Es sind aber auch andere Ausführungsformen zur Erreichung einer verlängerten Preßfläche denkbar. There are, however, other embodiments to achieve a prolonged pressing surface imaginable.
  • Um eine möglichst hohe Betriebssicherheit der Pressenpartie zu erreichen, wird bei schnellaufenden Maschinen angestrebt, daß die Papierbahn, wie beispielsweise in dem DE-Gbm 87 17 279 gezeigt, ständig mit mindestens einem Filz in Kontakt ist, um dadurch einen sogenannten freien Zug zu vermeiden, bei dem die Papierbahn Gefahr laufen würde, abzureißen. To achieve the highest possible operational reliability of the press section to reach, is aimed at high-speed machines, the paper web, as shown for example in the DE-Gbm 87 17 279, being continuously connected with at least one felt into contact, thereby avoiding a so-called free train, in which the paper web would run the risk of tearing. Nachteilig bei solchen Anordnungen ist allerdings, daß nach dem Austritt der Papierbahn aus dem Preßspalt eine Rückbefeuchtung durch das im Filz mitgeführte Wasser in die Papierbahn auftritt. A disadvantage of such arrangements, however, is that rewetting occurs after the exit of the paper web from the press nip through the entrained water in the felt to the paper web.
  • Zwar ist bereits zur Lösung dieses Problems eine Anordnung vorgeschlagen worden, (DE- OS 37 42 84 8), bei der spezielle Maßnahmen getroffen werden, um wenigstens einen Filz sehr schnell von der Papierbahn abzuheben, wenn sie den Preßspalt verläßt, jedoch reicht dies noch nicht aus. Although an arrangement is already to solve this problem have been proposed (DE-OS 37 42 84 8) are made in special measures quickly withdraw at least a felt very out of the paper web as it leaves the press nip, but this is still enough not from.
  • Ferner sind Lösungen bekannt, bei denen im zweiten Preßspalt lediglich ein Filz vorhanden ist. Further solutions are known in which only a felt is provided in the second press nip. Befindet sich dann besagter Filz oben, so kann die Bahn vor Einlauf in die zweite Preßstelle zu leicht abfallen. then said felt is located above, the path may become too easily before entry into the second press nip. Ist er dagegen unten, insbesondere als durchgehender Unterfilz für beide Pressen, dann wird die Bahn in voller Breite am Ausgang aus der zweiten Preßstelle mit der Oberwalze nach oben mitlaufen, wo sie nur schwer zu handhaben ist. If it is below the other hand, in particular as a continuous bottom felt for both presses, the web is run along the full width at the output from the second press nip with the upper roller to the top where it is difficult to handle. Andererseits ist auch an dieser Stelle die Tendenz der Papierbahn, das Wasser aus dem Filz hinter dem Preßspalt zurückzusaugen, größer. On the other hand, at this point, the tendency of the paper web, the water from the felt suck back behind the press gap, larger.
  • In der DE-OS 38 15 278 A1 ist eine Presse gezeigt mit zwei hintereinanderliegenden Walzenpressen mit je einem verlängerten Preßspalt, wodurch zwar die Voraussetzungen für eine Entwässerung der Papierbahn günstig sind, andererseits aber die Papierbahn mit Hilfe eines Filzes durch beide Preßstellen transportiert wird. In DE-OS 38 15 278 A1 a press is shown with two successive roll presses, each with an extended press nip, the conditions for the dewatering of the paper web are low thereby, but on the other hand, the paper web is transported by means of a felt through both press nips. Sie kann also nicht zwischen den beiden Pressen konditioniert werden. so it can not be conditioned between the two presses.
  • Der Erfindung liegt die Aufgabe zugrunde, den Entwässerungseffekt von Pressenpartien mit zwei hintereinanderliegenden verlängerten Preßspalten weiter zu verbessern,ohne dadurch die Betriebssicherheit der Bahnführung durch beide Pressen zu verschlechtern. The invention has for its object to improve the dewatering effect of press sections with two successive extended press nips on without thereby deteriorating the reliability of the web run through both pressing.
  • Diese Ziele werden durch die im Kennzeichen des Anspruchs 1 genannten Maßnahmen in vollem Umfang erreicht. These objects are achieved by the said measures in the characterizing part of claim 1 in full screen.
  • Von besonderen Vorteil ist bei der vorgeschlagenen Lösung, daß auf diese Weise jeweils verschiedene Filze für die beiden Preßstellen verwendet werden können. Of particular advantage is the proposed solution is that each different felts can be used for the two pressing points that way. Es ist daher möglich, jeden Filz nach dem Durchgang durch die Preßstelle neu zu konditionieren, also mit einem relativ geringen Wassergehalt für einen erneuten Preßvorgang zur Verfügung zu stellen. It is therefore possible to condition each felt after passing through the nip again to make so with a relatively low water content for re-pressing operation are available. Die Übergabe der Bahn vom ersten Unterfilz zum zweiten Oberfilz wird mit Hilfe einer befilzten und mit Unterdruck betriebenen Abnahmevorrichtung vorgenommen. The transfer of the web from the first lower felt to the second upper felt is carried out by means of a felted and operated with vacuum removal device. Es ist auch gewährleistet, daß die feuchte Bahn sicher zwischen den genannten Preßstellen geführt und am Filz gehalten werden kann. It is also ensured that the wet web can be guided securely between the said press nips and held on the felt.
  • Die sich anschließenden Unteransprüche zeigen besonders vorteilhafte Ausführungsformen der erfindungsgemäßen Pressenpartie. The subsequent sub-claims show particularly advantageous embodiments of the press section of the invention.
  • Die Erfindung wird erläutert anhand von Zeichnungen, welche darstellen The invention will be explained with reference to drawings which illustrate
    • Fig 1 bis Fig. 3 schematische Seitenansicht von erfindungsgemäß ausgeführten Pressenpartien, Fig 1 to Fig. 3 is a schematic side view of embodying the present invention press sections,
    • Fig. 4 schematische Teilansicht einer weiteren Ausführungsform Fig. 4 is a schematic partial view of a further embodiment
    • Fig. 5 schematische Teilansicht einer weiteren Ausführungsform Fig. 5 shows a schematic partial view of a further embodiment
  • In Fig. 1 wird eine erfindungsgemäße Pressenpartie dargestellt, in die die Papierbahn, zB von einem Langsieb 21 kommend, durch eine Pickupwalze 22 hineingeführt werden kann. In Fig. 1, a press section according to the invention is shown, in which the paper web can be, for example, coming from a forming wire 21, ushered by a pickup roller 22.
  • Diese Figur zeigt zwei hintereinanderliegende Preßstellen 1 und 2 mit den Preßflächen 3 und 4 bzw. 5 und 6. Es ist erkennbar, daß in Laufrichtung gesehen die Preßflächen eine verlängerte Form aufweisen (Breitnip). This figure shows two consecutive press nips 1 and 2 with the pressing surfaces 3 and 4 or 5 and 6. It can be seen that viewed in the running direction of the pressing faces have an elongated shape (wide nip). In der hier gezeigten Ausführungsform bestehen die Pressen aus unten liegenden Gegenwalzen 7 und 9 sowie oben liegenden Breitnip-Preßwalzen 8 und 10. Im Bereich der ersten Preßstelle 1 werden zwei Filzbänder 11 und 12 verwendet, welche gemeinsam mit der Papierbahn durch die erste Preßstelle hindurchlaufen. In the embodiment shown here, the presses of underlying counter-rollers 7 and 9 and overhead wide-nip press rolls 8 are made and 10. In the region of the first nip 1, two felt belts 11 and 12 are used, which pass together with the paper web through the first press nip. Durch die zweite Preßstelle 2 wird lediglich ein Oberfilz 13 geführt. Through the second press nip 2, only a top felt 13 is guided. Die Abnahme der Bahn vom Filzband 12 erfolgt durch die Abnahmevorrichtung 15, hier als Saugwalze ausgeführt, die von dem Oberfilz 13 teilweise umschlungen ist. The decrease of the web from the felt band 12 is accomplished by the removal device 15, here embodied as a suction roll, which is wrapped by the upper felt 13 partially. Die durch die Abnahmevorrichtung 15 vom unteren Filzband 12 abgehobene Papierbahn wird auf sehr kurzem Wege oder in direktem Kontakt an die untere Gegenwalze 9 der zweiten Preßstelle 2 herangeführt, so daß ein Abfallen der Bahn infolge ihres Gewichts praktisch ausgeschlossen ist. The lifted by the removal device 15 from the lower felt belt 12 the paper web is brought in a very short path or in direct contact with the lower mating roll 9 of the second nip 2, so that falling of the sheet is practically impossible due to their weight. Hinter dem Preßspalt haftet die Bahn weiterhin auf der unteren Gegenwalze 9, während der Oberfilz 13 von der Bahn abgehoben wird. After the press nip, the web continues to adhere to the lower counter-roller 9, is lifted from the web during the upper felt. 13 An der weiteren Abnahmevorrichtung 18, welche hier als gegen die untere Gegenwalze 9 anstellbare Saugwalze ausgeführt ist, gelangt die Bahn auf den weiteren Oberfilz 14 und mit diesem zusammen in den Beginn der sich anschließenden Trockenpartie. In the further removal device 18, which suction roll 9 engagable is embodied here as against the lower mating roll, the web reaches the upper felt 14 and further together with it in the beginning of the subsequent dryer section. Für den Fall eines Bahnabrisses bzw. beim Überführen im Anfahrfalle der Anlage können die nicht weitergeführten Papierbahnen oder -streifen durch die Schaber 19 bzw. 20 in den Ausschußauflöser 23 gelangen, ohne daß dadurch Probleme verursacht werden. In the event of a web break or during the transfer in the system, the Anfahrfalle discontinued paper webs or strips can by the scraper 19 and 20 respectively in the Ausschußauflöser 23 reach without problems caused thereby.
  • Ein weiterer Vorteil ist erzielbar, wenn beim Anfahren der Pressenpartie die Papierbahn durch die Preßstellen 1 und 2 mit voller Breite hindurchgeführt werden kann, weil das der Schonung der manchmal empfindlichen Bauteile der Breitnippreßwalzen dient. A further advantage is obtained if the paper web can be passed through the press nips 1 and 2 with full width at start of the press section because that serves to protect the sensitive components of the Breitnippreßwalzen sometimes. Wenn dann die Bahn von der letzten Preßwalze abläuft, kann ein Überführstreifen gebildet werden, etwa für die sich anschließende Trokkenpartie. Then, when the train runs from the last press roll, a transfer strip may be formed, such as for the subsequent drying section. Der dabei auftretende Ausschuß gelangt in den darunterliegenden Ausschußauflöser 23. The thereby occurring Committee enters the underlying Ausschußauflöser 23rd
  • Bei der in Fig. 2 gezeigten Ausführungsform wird die betriebssichere Übergabe zwischen der ersten und zweiten Presse durch einen Saugkasten 16 gewährleistet, welcher oberhalb des Oberfilzes 13 auf den Filz einen Unterdruck ausübt und dadurch die unter ihr liegende Bahn an dem Oberfilz 13 festhält. In the embodiment shown in Fig. 2, the reliable handover between the first and second press is ensured by a suction box 16, which above the top felt 13 to the felt exerts a negative pressure and thereby clings to the upper felt 13 underneath it web. Von dort gelangt die Bahn zusammnen mit dem Oberfilz in die zweite Preßstelle 2. Anstelle des Saugkastens kann auch ein spezieller Blaskasten verwendet werden, der nach dem Injektorprinzip in schmalen Schlitzen eine Luftströmung mit Richtung weg vom Filz erzeugt und eine haltende Wirkung auf die Bahn ausübt. From there, the web passes zusammnen with the upper felt in the second press nip 2. In place of the suction box may also be a special blow box are used, the produced according to the injector principle in narrow slots, an air flow with a direction away from the felt and exerts a retaining action on the web.
  • Denkbar ist auch, wie in Fig. 3 gezeigt, anstelle oder zusätzlich zu dem Saugksten 16 ein Transportsieb 17 zu verwenden, welches die Bahn von unten an den Oberfilz 13 drückt. It is also conceivable, as shown in Fig. 3, instead of or in addition to the Saugksten 16, a transport wire 17 to be used, which pushes the web from underneath to the top felt. 13 Auch hierdurch ist eine betriebssichere Überführung zwischen den beiden Preßstellen 1 und 2 gewährleistet. Also thereby a reliable transfer between the two press nips 1 and 2 is ensured. Ein weitere vorteilhafte Möglichkeit wäre ein hier nicht dargestellter Blaskasten unterhalb der Papierbahn zu demselben Zweck. A further advantageous possibility would be a not illustrated here blow box below the web for the same purpose.
  • Neben den in den Fig. 1 - 3 gezeigten Pressenpartien mit in beiden Preßstellen 1 und 2 oben liegenden Breitnippreßwalzen ist auch die Anordnung mit in der ersten Preßstelle 1 untenliegender Breitnippreßwalze 8 und oben liegender Gegenwalze 7 möglich, wie in Fig. 4 dargestellt. In addition to the in the Fig. 1 - press sections shown 3 lying in the two press nips 1 and 2 above Breitnippreßwalzen the arrangement with lower side in the first press nip 1 Breitnippreßwalze 8 and overhead counter roller 7 is possible, as illustrated in Figure 4.. Es kann ähnlich wie bei den bereits beschriebenen Bauformen aus der ersten Preßstelle 1 die Bahn mit zwei Filzen herausgeführt und der obere Filz abgehoben werden. It can be similar to the previously described configurations of the first nip 1, the web having two felts, and led out of the upper felt to be lifted. Zur sicheren Mitnahme der Bahn am unteren Filzband 12 ist eine darunterliegende Saugwalze 24 installiert. For safe driving of the train at the bottom felt belt 12 an underlying suction roll 24 is installed. Diese Lösung ist mit den genannten Ausführungen zur Übernahme der Bahn in die zweite Preßstelle 2 kombinierbar. This solution can be combined with the above remarks on the acquisition of the web into the second nip second
  • Eine weitere Ausführungsform der erfindungsgemäßen Pressenpartie zeigt Figur 5. Darin wird eine sehr kompakte Anordnung der ganzen Pressenpartie gezeigt. A further embodiment of the press section of the invention is shown in FIG 5. This is shown in a very compact arrangement of the entire press section. Die mit Unterdruck betriebene Abnahmevorrichtung 15 führt die Bahn in direkter Weise von der zur ersten Preßstelle 1 gehörenden Gegenwalze 7 an die zur zweiten Preßstelle 2 gehörende Gegenwalze 9 heran. The operated with vacuum take-off device 15 transfers the web in a direct manner from the first press nip belonging to the counter roller 7 to the 1 belonging to the second pressing point 2 against roller 9 zoom. Nach Durchlaufen der zweiten Preßstelle 2 verbleibt die Bahn auf der Gegenwalze 9 bis zur weiteren Abnahmestelle 18, während der Oberfilz 13 unmittelbar nach Verlassen der Preßstelle 5, 6 von der Bahn abgeführt wird. After passing through the second pressing 2, the web remains on the counter-roller 9 to the further take-off point 18, while the upper felt 13 immediately after leaving the press nip 5, 6 is removed from the web. Die weitere Abnahmevorrichtung 18 führt die Bahn direkt in die nachfolgende Trockenpartie. The further tapping device 18 guides the web directly into the subsequent dryer section.

Claims (17)

1. A pressing section of a paper-making machine for dewatering a paper web, with two separate pressing points (1 and 2) arranged in series, each of which is formed between an upper and a lower elongated wide-nip pressing surface (3 and 4 or 5 and 6 respectively), and with a removal device (15) located between the two pressing points (1, 2) and operated by a partial vacuum, which pressing section has in the first pressing point (1) and the second pressing point (2) at least one separate felt belt (11 - 13) each passing together with the web through the pressing points, the second pressing point (2) comprising a cylindrical mating roll (9) lying substantially below the pressing point and also a wide-nip press roll (10) substantially matching the contour of the respective mating roll lying substantially above the pressing point and forming the elongated press nip, no lower felt belt passing through the second pressing point, characterised in that after the first pressing point (1) the upper felt belt (11) - where present - is guided away from the paper web underlying it and the paper web is guided further by the lower felt belt (12) to the removal device (15) contacted by the upper felt (13) of the second pressing point (2), from which it can then pass to the second pressing point (2).
2. A pressing section according to Claim 1, characterised in that the paper web is transferred from the lower felt belt (12) of the first pressing point (1) to the removal device (15) contacted by the upper felt (13) of the second pressing point (2) and which is operated by a partial vacuum.
3. A pressing section according to Claim 1 or 2, characterised in that the paper web from the removal device (15) located between the two pressing points (1, 2) comes into contact with the lower mating roll (9) of the second pressing point after at most a very short distance and then is guided through the second pressing point (2) together with the upper felt (13).
4. A pressing section according to Claim 1, characterised in that the first pressing point (1) is provided with an upper felt belt (11) and that the removal device (15) removes the web directly from the first pressing point (1), in particular from a lower mating roll (7) of the first pressing point (1).
5. A pressing section according to Claim 1, characterised in that the web is guided by the removal device (15) between the two pressing points (1, 2) on the upper felt (13) to the lower mating roll (9) of the second pressing point (2) such that a suction box (16) which is provided in this section above the upper felt (13) and can be acted upon by a partial vacuum ensures the connection between the upper felt and the web.
6. A pressing section according to Claim 1, characterised in that the web is guided by the removal device between the two pressing points on the upper felt to the lower mating roll of the second pressing point such that a transport wire (17) running in this section beneath the web ensures the connection between the upper felt (13) and the web.
7. A pressing section according to Claim 1, characterised in that the web is guided by the removal device between the two pressing points on the upper felt to the lower mating roll of the second pressing point such that a blowing box located in this section above the web, which box produces an air flow directed away from the felt according to the injector principle in narrow slots, ensures the connection between the upper felt (13) and the web.
8. A pressing section according to Claim 1, characterised in that the web after the second pressing point (2) is guided by a further removal device (18) on an upper felt (14) located there, such that a suction box (16) which is provided in this section above the upper felt (14) and which can be acted upon by a partial vacuum ensures the connection between the upper felt and the web.
9. A pressing section according to Claim 1, characterised in that the web after the second pressing point (2) is guided by a further removal device (18) on an upper felt (14) located there, such that a blowing box provided in this section above the web, which box produces an air flow directed away from the felt according to the injector principle in narrow slots, ensures the connection between the upper felt (14) and the web.
10. A pressing section according to Claim 1, characterised in that the first pressing point (1) comprises a cylindrical mating roll (7) located substantially beneath the pressing point and also a wide-nip press roll (8) which is substantially adapted to the contour of the respective mating roll and lies substantially above the pressing point and forms the elongated press nip.
11. A pressing section according to Claim 1, characterised in that the two separate pressing points (1 and 2) located in series are positioned substantially at the same height.
12. A pressing section according to a preceding claim, characterised in that after passing through the second pressing point (2) the upper felt (13) is guided such that it becomes detached from the web initially remaining on the lower mating roll (9), and that the web is removed from the lower mating roll (9) in an additional removal device (18) provided with an additional upper felt (14) and is guided on into the drying section.
13. A pressing section according to Claim 12, characterised in that the additional removal device (18) provided with an additional upper felt (14) can be pivoted and adjusted against the lower mating roll (9) of the second pressing point (2).
14. A pressing section according to Claim 1, characterised in that a closed paper web guide is present throughout the drying section.
15. A pressing section according to Claim 1, characterised in that a broke repulper (23) is provided substantially beneath the second pressing point (2), into which repulper the paper webs which occur in the event of tears or transfer can fall and be suspended therein.
16. A pressing section according to Claim 1, characterised in that therein no device for forming transfer strips is provided before the second pressing point (2), so that the transfer of the web through the pressing points (1, 2) is effected at full web width.
17. A pressing section according to Claim 1, characterised in that after the first pressing point (1) the upper felt belt is removed immediately from the paper web, in order thereby to avoid remoistening of the web.
EP19920102028 1991-04-16 1992-02-07 Press section for a papermachine Expired - Lifetime EP0509199B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4112355 1991-04-16
DE19914112355 DE4112355A1 (en) 1991-04-16 1991-04-16 Press section of a paper machine

Publications (3)

Publication Number Publication Date
EP0509199A1 EP0509199A1 (en) 1992-10-21
EP0509199B1 true EP0509199B1 (en) 1995-11-08
EP0509199B2 EP0509199B2 (en) 1999-03-24

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EP19920102028 Expired - Lifetime EP0509199B2 (en) 1991-04-16 1992-02-07 Press section for a papermachine

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US (2) US5308450A (en)
EP (1) EP0509199B2 (en)
AT (1) AT130060T (en)
CA (1) CA2065960C (en)
DE (1) DE4112355A1 (en)
ES (1) ES2079703T3 (en)
FI (1) FI114930B (en)

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US5308450A (en) 1994-05-03
US5431787A (en) 1995-07-11
AT130060T (en) 1995-11-15
EP0509199B2 (en) 1999-03-24
DE4112355A1 (en) 1992-10-22
FI114930B (en) 2005-01-31
FI920833D0 (en)
ES2079703T3 (en) 1996-01-16
CA2065960C (en) 1998-07-07
FI920833A (en) 1992-10-17
CA2065960A1 (en) 1992-10-17
FI920833A0 (en) 1992-02-25
EP0509199A1 (en) 1992-10-21
FI114930B1 (en)

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