EP0479748B1 - Verfahren und Vorrichtung in der Trockenpartie einer Papiermaschine zum Einfädeln einer Papierbahn - Google Patents

Verfahren und Vorrichtung in der Trockenpartie einer Papiermaschine zum Einfädeln einer Papierbahn Download PDF

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Publication number
EP0479748B1
EP0479748B1 EP91850239A EP91850239A EP0479748B1 EP 0479748 B1 EP0479748 B1 EP 0479748B1 EP 91850239 A EP91850239 A EP 91850239A EP 91850239 A EP91850239 A EP 91850239A EP 0479748 B1 EP0479748 B1 EP 0479748B1
Authority
EP
European Patent Office
Prior art keywords
drying
wire
leader
cylinder
doctor
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
EP91850239A
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English (en)
French (fr)
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EP0479748A1 (de
Inventor
Heikki Ilvespää
Antti Kuhasalo
Jouko Yli-Kauppila
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.)
Valmet Oy
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Valmet Oy
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Publication date
Application filed by Valmet Oy filed Critical Valmet Oy
Publication of EP0479748A1 publication Critical patent/EP0479748A1/de
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Publication of EP0479748B1 publication Critical patent/EP0479748B1/de
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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders

Definitions

  • the invention concerns a method of threading of a paper web in a multi-cylinder dryer of a paper machine as defined in the preamble of claim 1.
  • the invention concerns a multi-cylinder dryer of a paper machine as defined in the preamble of claim 6.
  • the threading involves the drawback that the leader tends to follow the smooth face of the drying cylinder in stead of the drying wire as the wire runs from the drying cylinder to the following leading suction cylinder or roll.
  • arrangements of air nozzles have been employed, of which nozzle arrangements one has been fitted before each leading suction cylinder and through which nozzle arrangements air jets are blown to guide the run of the leader.
  • attempts are made to make sure that the leader remains on the drying wire. After the leader has reached the suction zone on the leading cylinder, the leader is transferred on the wire onto the next drying cylinder.
  • blow devices placed after the drying section are described, by whose means the leader is guided.
  • the principal object of the present invention is to provide novel solutions for the problems discussed above so that said drawbacks are largely avoided.
  • the invention can be applied both in drying cylinder groups provided with single-wire draw and in cylinder groups provided with twin-wire draw, if necessary, over the entire length of the drying section.
  • the invention In connection with single-wire draw, the invention is suitable for use both in normal groups and in inverted groups. According to the present-day knowledge, the invention is most advantageously applicable in connection with single-wire draw.
  • the blowings when the air jets are directed expressly at the area of the tip of the doctor blade at a suitable small angle in relation to the plane of the blade, the blowings can be deflected along the cylinder face that precedes the blade so that the effect of the blowing extends into the opening nip. In this way the blowings obtain a sufficient support and transfer effect on the leader.
  • a sufficiently high energy must be used to provide a reliable transfer and support effect.
  • Figure 1 shows a drying section of a paper machine which is provided with single-wire draw and in which the method and the device of the invention are applied.
  • Figure 2 illustrates parameters that are of significance in the location and dimensioning of the method and the device in accordance with the invention.
  • Figure 3 is a side view of a first embodiment of equipment of the invention
  • Figure 4 shows the same device as Fig. 3, seen in the direction IV-IV.
  • Figure 5 shows a device in accordance with the invention as applied in an inverted cylinder group provided with single-wire draw.
  • Figure 6 shows an application of the invention in a gap between cylinder groups in which the operation is transferred from single-wire draw to twin-wire draw as well as in a cylinder group with twin-wire draw.
  • Figure 7 shows an application of the invention in cylinder groups with twin-wire draw and in the gaps between such cylinder groups.
  • Fig. 1 is a schematic illustration of a cylinder group with single-wire draw, in which, in the upper row, there are heated drying cylinders 10 and, in the lower row, leading suction cylinders 20 with perforated and grooved outer mantle.
  • Fig. 5 shows a corresponding inverted group, wherein the drying cylinders 10′ are placed in the lower row and, correspondingly, the leading suction cylinders 20′ in the upper row.
  • the drying wire 11 of the single-wire draw runs meandering in contact with the drying cylinders 10 and the leading cylinders 20 so that, on the drying cylinders 10, the web to be dried enters into direct contact with the heated smooth faces of the cylinders 10 and, on the leading cylinder 20, the web is placed at the side of the outside curve on the outer face of the wire 11, where it is held by negative pressure acting from the interior of the cylinder 20 through the perforations and grooves (not shown) in its mantle.
  • a blow box 15 is provided, for example a device marketed by the applicant with the trade mark "UNO RUN BLOW BOX", by means of which formation of a detrimentally high negative pressure in the pressurized nip N+ is prevented and a suitable negative pressure is maintained at the side of the wire 11, which negative pressure guarantees that the web remains on the face of the wire 11 on said straight runs.
  • doctors operate against the free lower sector of the cylinders 10, which doctors comprise a doctor beam 12 and a doctor blade 14, which is attached to said beam by means of a holder 13 and doctors and keeps the smooth faces of the cylinders 10 clean.
  • doctors are fitted above the cylinders 10′ against their free sectors.
  • the doctors 12,13,14 are provided with blow devices, by whose means blowings F1 are directed against the tip portions of the doctor blades 14, from which the blowings bounce and are "reflected" in the direction F2 towards the opening nip N-.
  • blow devices by whose means blowings F1 are directed against the tip portions of the doctor blades 14, from which the blowings bounce and are "reflected" in the direction F2 towards the opening nip N-.
  • Figs. 2, 3 and 4 show an embodiment of the device in more detail.
  • an air distribution pipe 22 has been attached to the side of the doctor beam 12, one end of said pipe 22 being a closed end 22a, whereas the other end communicates with the blow-air supply duct 24.
  • the blow pipe 22 is provided with a number of nozzle holes 23 across the width L2. The blow pipe is arched to its place by means of flanges 25 and 26.
  • the air jets F1 can be directed at the area of the tip of the doctor blade 14 so that the air jets bounce and are "reflected" from the plane of the doctor blade and are deflected in a direction parallel to the outer face of the cylinder 10, being directed in the direction F2 at the opening nip N-.
  • a sufficiently high transfer and support effect is produced for the blowings F1, said effect being applied to the leader.
  • the energy of the blowings F1 must be high enough to achieve said objectives.
  • doctor beams 12 are attached by their ends, by means of axle journals 16, in connection with their pivoting and loading means (not shown).
  • the width of the leader S is denoted with the reference L1.
  • the extension L2 of the blowings F1 in the transverse direction is of the same order (width L2) as the width L1 of the leader S. Air from the blowings F1 is guided along the face of the cylinder 10 in the direction of the arrow F2 into the opening nip N-. In this way, it is achieved by means of the blowings F1,F2 that the leader S is pressed against the wire 11, in which position the suction effect of the blow box 15 keeps the leader S.
  • the blowings F1 of the doctor placed below said cylinder 10 are closed, whereby the leader S is carried by nature to the doctor blade 14, which detaches it from the cylinder 10, and the leader falls down onto the broke conveyor placed underneath, which conveyor carries the broke into the pulper.
  • the blowings F1 at this cylinder 10 are controlled to make them operative, whereby, owing to the direction of the blowings F1, they detach the leader from the doctor blade 14 and guide the leader S onto the support of the wire 11 placed facing it, which wire carries the leader S over the suction zone of the leading suction cylinder 20 onto the next cylinder 10.
  • Fig. 2 illustrates parameters significant in the dimensioning and alignment of the device in accordance with the invention.
  • the width L1 of the leader is about 200 mm
  • the width L2 of the blowings in the transverse direction is typically about 200-350 mm.
  • blow pipe 22 it is possible to use a perforated pipe, in which the diameter of the nozzle holes is typically 3-4 mm and the spacing 30-50 mm.
  • the blow width L2 may be narrower than the width L1 of the leader, but, as a rule, the blow width L2 should preferably not be very much larger than the width L1 of the leader. For example, with blowings F1 extending across a width of about 300 mm it is possible to guide a leader S even as wide as about 600 mm, but, as a rule, the width proportions cannot be reversed.
  • Fig. 5 shows the use of the blowings in an inverted cylinder group provided with single-wire draw, wherein the drying cylinders 10′ are placed in the lower row and the leading suction cylinders 20′ in the upper row.
  • the operation of the blowings F1 and F2 is similar to that described above.
  • the leader cannot be doctored onto the broke conveyor.
  • blowings F3 and F4 are provided, by whose means the leader S is held on the leading cylinder 20′. Moreover, between the leading cylinders 20′, it is possible to employ additional blow pipes 17, from which blowings F5 are directed against the leader S so as to guide the leader over the suction zones of the leading cylinders 20′ onto the following drying cylinder 10′.
  • Fig. 6 shows an application of the invention in a group gap formed between a group with single-wire draw and a group with twin-wire draw.
  • the web is transferred from the drying wire 11 of the group with single-wire draw by means of a suction box 32 after a guide roll 33a as a free draw W p onto the lower wire 11B of the group with twin-wire draw.
  • the group with twin-wire draw in the way known in prior art, there are two rows of steam-heated drying cylinders 10A and 10B, one row above the other, as well as an upper wire 11A and a lower wire 11B, which are guided by guide rolls 31A; 31B.
  • blow boxes 32 are placed, by whose means the support contact between the web and the wire is promoted.
  • the doctor beams 12 are provided with blow pipes 22, from which the blowings F1 in accordance with the invention are directed at the area of the tip of the doctor blade 14.
  • a second blowing F3 is also employed, which is directed towards the path of running of the leader S.
  • the blowings F1 are not necessarily always needed in an area of twin-wire draw, or the blowings F1 may be very weak. On the contrary, the blowings F3 are even more helpful.
  • the web has free draws W o , and the leader S also runs along the same route when it is passed through the group with twin-wire draw, being aided by means of the method and the device of the invention.
  • Fig. 7 shows two subsequent groups with twin-wire draw.
  • the web is transferred as a free draw W p from one group to the other and onto the first lower cylinder 10B in the latter group between the guide rolls 31A and 31B.
  • Both of the groups with twin-wire draw are provided with doctor beams 12, at which blow pipes 22 in accordance with the invention are placed at suitable locations, from which blow pipes blowings F1 and/or F3 in accordance with the invention are applied to produce the effects described above.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Detergent Compositions (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Peptides Or Proteins (AREA)

Claims (9)

  1. Verfahren zum Aufführen einer Papierbahn in einem Mehrzylindertrockner einer Papiermaschine mittels Luftstrahlen (F₁), wobei das Aufführen im wesentlichen ohne ein System von Aufführ-Seilen stattfindet, wobei die Bahn in Doppelsiebführung entlang einem meanderförmigen Pfad um Trockenzylinder (10A, 10B) oder in einer Einzelsiebführung auf einem Trockensieb (11) um Trockenzylinder (10, 10') und Leitsaugzylinder oder -walzen (20, 20') geleitet wird und wobei der freie Sektor der Trockenzylinder (10, 10', 10A, 10B) mittels der Klinge (14) eines Schaberbalkens (12) gereinigt wird, dadurch gekennzeichnet, daß der Aufführungsstreifen (S) der Bahn, nachdem dieser um einen Trockenzylinder (10, 10', 10A, 10B) geleitet worden ist, von dem Trockenzylinder (10, 10', 10A, 10B) weggeleitet wird, und zwar mittels Luftstrahlen (F₁), die sich über einen wesentlichen Anteil oder über das gesamte Ausmaß der Breite (L₁) des Aufführungsstreifens (S) erstrecken, wobei die Luftstrahlen (F₁) von dem Schaberbalken (12) auf den Bereich (K) der Spitze seiner Schaberklinge (14) aufgetragen werden, die bezogen auf die Ebene der Schaberklinge (14) in einem Winkel (B) in dem Bereich von 5° bis 45° auf den Trockenzylinder (10, 10', 10A, 10B) aufgetragen wird.
  2. Verfahren gemäß Patentanspruch 1, dadurch gekennzeichnet, daß der Aufführungsstreifen (S) mittels der Luftstrahlen (F₁) sowohl von der Schaberklinge (14) abgelöst wird als auch auf das Trockensieb (11, 11A, 11B) transferiert wird, um weitergefördert zu werden, wodurch es sichergestellt ist, daß der Aufführungsstreifen (S) auf dem Trockensieb (11, 11A, 11B) nachfolgt.
  3. Verfahren gemäß Patentanspruch 1 oder 2, dadurch gekennzeichnet, daß die Luftstrahlen (F₁) mittels Düsen einer mit dem Schaberbalken (12) verbundenen Düsenrohrleitung (22) auf den Bereich (K) der Spitze der Schaberklinge (14) aufgetragen werden und in Luftstrahlen (F₂) abgelenkt werden, die im wesentlichen parallel zu dem Mantel des Trockenzylinders (10) sind, und in den Öffnungsspalt (N-) geleitet werden, der durch den Trockenzylinder (10, 10', 10A, 10B) und das Trockensieb (11, 11A, 11B) definiert ist.
  4. Verfahren gemäß einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß sich der Winkel (B) in dem Bereich von 10° bis 30° befindet.
  5. Verfahren gemäß einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß die Düsen Löcher (23) mit einem Durchmesser in der Größenordnung von 3 bis 4 mm haben und die Luftstrahlen (F₁) in einem Abstand (L) von kleiner oder gleich 250 mm bei einem Druck von 50 bis 350 kPa auf den Bereich (K) der Spitze der Schaberklinge (14) aufgetragen werden.
  6. Mehrzylindertrockner einer Papiermaschine zum Trocknen einer Papierbahn, mit einer Vielzahl von Trockenzylindern (10, 10', 10A, 10B), wobei die Bahn in Doppelsiebführung entlang einem meanderförmigen Pfad um die Trockenzylinder (10A, 10B) oder in einer Einzelsiebführung auf einem Trockensieb um die Trockenzylinder (10, 10') und Leitsaugzylinder oder -walzen (20, 20') geleitet wird, wobei der Mehrzylindertrockner ferner Schaberbalken (12) mit einer gegen den freien Sektor der Trockenzylinder (10, 10', 10A, 10B) wirkenden Klinge (14) und mit einer damit verbundenen Gebläsevorrichtung aufweist, dadurch gekennzeichnet, daß die Gebläsevorrichtung eine querverlaufende Düsenrohrleitung (22) oder eine gleichartige Düsenanordnung aufweist, die auf der Höhe des Aufführungsstreifen (S) der Papierbahn in der Nähe von einem der Enden der Schaberklinge (12) an der Antriebsseite der Papiermaschine angeordnet ist, wobei die Düsenrohrleitung (22) oder dergleichen eine Anzahl von Seite an Seite angeordneten Düsenöffnungen (23) oder einen gleichartigen Düsenschlitz aufweist, wodurch die Blasrichtung der Düsen auf den Bereich (K) der Spitze der Schaberklinge (14) gerichtet ist, die bezogen auf die Ebene der Schaberklinge (14) in einem Winkel (B) von 5° bis 45° auf den Trockenzylinder (10, 10', 10A, 10B) aufgebracht wird, wobei sich die Düsenrohrleitung (22) und ihre Düsenöffnungen (23) oder ihr gleichartiger Düsenschlitz im wesentlichen über die gesamte Breite (L₁) des Aufführungsstreifens (S) erstrecken.
  7. Mehrzylindertrockner gemäß Patentanspruch 6, dadurch gekennzeichnet, daß die Düsenrohrleitung (22) auf derartige Weise angebracht ist, daß ihre Düsenöffnungen (23) in einem Abstand von etwa 100 bis 300 mm, vorzugsweise etwa 200 mm, von der Spitze der Schaberklinge (14) angeordnet sind.
  8. Mehrzylindertrockner gemäß Patentanspruch 6 oder 7, dadurch gekennzeichnet, daß zusätzliche Düsen mit dem Schaberbalken (12) verbunden sind, von dem aus zusätzliche Luftstrahlen (F₃, F₄) auf den Aufführungsstreifen (S) gerichtet sind, der auf dem Trockensieb (11) oder als freier Zug (W₀) an dem Schaberbalken (12) vorbeigeleitet wird.
  9. Mehrzylindertrockner gemäß einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß die Spitze der Schaberklinge (14) in einem senkrechten Abstand (P) in dem Bereich von 150 bis 500 mm von dem Trockensieb (11) oder dem entsprechenden freien Zug (W₀) der an der Schaberklinge (14) vorbeigeleiteten Bahn angeordnet ist, während der Abstand (L) zwischen den Düsenöffnungen (23) und der Spitze der Schaberklinge (14) kleiner oder gleich 250 mm ist.
EP91850239A 1990-10-01 1991-09-30 Verfahren und Vorrichtung in der Trockenpartie einer Papiermaschine zum Einfädeln einer Papierbahn Expired - Lifetime EP0479748B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI904841 1990-10-01
FI904841A FI86900C (fi) 1990-10-01 1990-10-01 Foerfarande och anordning vid spetsdragning av en pappersbana i maongcylindertorken av en pappersmaskin

Publications (2)

Publication Number Publication Date
EP0479748A1 EP0479748A1 (de) 1992-04-08
EP0479748B1 true EP0479748B1 (de) 1996-05-29

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EP91850239A Expired - Lifetime EP0479748B1 (de) 1990-10-01 1991-09-30 Verfahren und Vorrichtung in der Trockenpartie einer Papiermaschine zum Einfädeln einer Papierbahn

Country Status (5)

Country Link
EP (1) EP0479748B1 (de)
AT (1) ATE138702T1 (de)
CA (2) CA2052059C (de)
DE (1) DE69119859T2 (de)
FI (1) FI86900C (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0639668A2 (de) * 1993-08-06 1995-02-22 J.M. Voith GmbH Trockenpartie
EP0726355A2 (de) * 1995-02-09 1996-08-14 Voith Sulzer Papiermaschinen GmbH Verfahren und Vorrichtung zum Transfer eines Papierstreifens von einer ersten zu einer zweiten Bearbeitungsstation in einer Papiermaschine
EP0887462A2 (de) * 1997-06-25 1998-12-30 Voith Sulzer Papiermaschinen GmbH Maschine zur Herstellung einer Materialbahn
US5987777A (en) * 1995-12-22 1999-11-23 Voith Sulzer Papiermaschinen Gmbh Dry end

Families Citing this family (10)

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Publication number Priority date Publication date Assignee Title
US5661911A (en) * 1994-02-17 1997-09-02 Valmet Corporation Dryer section of a paper machine
FI93875C (fi) * 1994-02-17 1995-06-12 Valmet Paper Machinery Inc Menetelmä paperirainan kuivatuksessa sekä paperikoneen kuivatusosa
FI120005B (fi) * 2001-03-06 2009-05-29 Metso Paper Inc Sovitelma paperikoneen kuivatusosalla
WO2004094723A1 (en) * 2003-04-24 2004-11-04 Metso Paper, Inc. Doctor for a paper or board machine
FI122337B (fi) 2005-08-25 2011-12-15 Metso Paper Inc Menetelmä ja sovitelma päänviennissä rainanmuodostuskoneen kuivatusosalla
FI124219B (fi) 2007-11-14 2014-05-15 Valmet Technologies Inc Kaavinlaitteisto päänvientinauhan irrottamiseksi liikkuvasta pinnasta kuiturainakoneella
FI123016B (fi) * 2011-02-17 2012-10-15 Metso Paper Inc Menetelmä ja sovitelma täysleveän rainan päänviennissä kuiturainakoneen kuivatusosalla
DE102012212071A1 (de) * 2012-07-11 2013-10-02 Voith Patent Gmbh Trockenpartie
FI126414B (fi) * 2015-10-09 2016-11-30 Valmet Technologies Oy Kaavinventilaattoripalkki kuiturainakoneen kuivatusosan kaavinta varten ja asennussarja kaavinventilaattorin muodostamiseksi kuiturainakoneen kuivatusosan kaavinpalkista
CN108061453A (zh) * 2017-11-20 2018-05-22 湖州翔顺工贸有限公司 一种纺织加工用烘干装置

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
FI54954C (fi) * 1977-07-07 1979-04-10 Valmet Oy Foerfarande i torkpartiet av en pappersmaskin foer att saekra banans oeverfoering fraon presspartiet till torkpartiet
FI62571C (fi) * 1980-12-01 1983-01-10 Valmet Oy Anordning vid flercylindertork i en pappersmaskin
FI67901C (fi) * 1983-10-03 1987-07-20 Valmet Oy Foerfarande och anordning i torkpartiet i en pappersmaskin vid styrning av banans spets.
FI69144C (fi) * 1984-05-04 1985-12-10 Valmet Oy Anordning i en pappersmaskin vid styrningen av banans spetsdragningsband
FI69145C (fi) * 1984-07-05 1985-12-10 Valmet Oy Anordning i en pappersmaskin vid transport och styrning av banans spetsdragningsband
US4918836A (en) * 1987-02-13 1990-04-24 Beloit Corporation Tail cutter apparatus and method
EP0364114B1 (de) * 1988-09-29 1993-12-15 Pulp and Paper Research Institute of Canada Überführen einer feuchten Zellulosebahn
DE3941242A1 (de) * 1989-12-14 1991-06-20 Voith Gmbh J M Fuehrungsplatte zum einfaedeln einer bahn

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0639668A2 (de) * 1993-08-06 1995-02-22 J.M. Voith GmbH Trockenpartie
US5735060A (en) * 1993-08-06 1998-04-07 Voith Sulzer Papiermaschinen Gmbh Dryer section including a device and method for transferring a strip of paper from a first treatment station to a second treatment station in a paper machine
EP0726355A2 (de) * 1995-02-09 1996-08-14 Voith Sulzer Papiermaschinen GmbH Verfahren und Vorrichtung zum Transfer eines Papierstreifens von einer ersten zu einer zweiten Bearbeitungsstation in einer Papiermaschine
US5718058A (en) * 1995-02-09 1998-02-17 Voith Sulzer Papiermaschinen Gmbh Process and apparatus for the traveling of a paper tail from a first to a second handling station in a paper machine
US5987777A (en) * 1995-12-22 1999-11-23 Voith Sulzer Papiermaschinen Gmbh Dry end
EP0887462A2 (de) * 1997-06-25 1998-12-30 Voith Sulzer Papiermaschinen GmbH Maschine zur Herstellung einer Materialbahn
EP0887462A3 (de) * 1997-06-25 1999-05-19 Voith Sulzer Papiermaschinen GmbH Maschine zur Herstellung einer Materialbahn
US6145217A (en) * 1997-06-25 2000-11-14 Voith Sulzer Papermaschinen Gmbh Machine for manufacturing a material web

Also Published As

Publication number Publication date
FI86900B (fi) 1992-07-15
CA2052596A1 (en) 1992-04-02
EP0479748A1 (de) 1992-04-08
DE69119859D1 (de) 1996-07-04
FI904841A0 (fi) 1990-10-01
CA2052059C (en) 1999-02-16
CA2052059A1 (en) 1992-04-02
ATE138702T1 (de) 1996-06-15
DE69119859T2 (de) 1996-10-24
FI86900C (fi) 1992-10-26
FI904841A (fi) 1992-04-02

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