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EP0769465B1 - Bobineuse à cylindres porteurs - Google Patents

Bobineuse à cylindres porteurs Download PDF

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Publication number
EP0769465B1
EP0769465B1 EP96114134A EP96114134A EP0769465B1 EP 0769465 B1 EP0769465 B1 EP 0769465B1 EP 96114134 A EP96114134 A EP 96114134A EP 96114134 A EP96114134 A EP 96114134A EP 0769465 B1 EP0769465 B1 EP 0769465B1
Authority
EP
European Patent Office
Prior art keywords
support roller
winding machine
support
machine according
rollers
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
EP96114134A
Other languages
German (de)
English (en)
Other versions
EP0769465A2 (fr
EP0769465A3 (fr
Inventor
Jens Krüger
Rudolf Beisswanger
Walter Kaipf
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 EP0769465A2 publication Critical patent/EP0769465A2/fr
Publication of EP0769465A3 publication Critical patent/EP0769465A3/fr
Application granted granted Critical
Publication of EP0769465B1 publication Critical patent/EP0769465B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/2238—The web roll being driven by a winding mechanism of the nip or tangential drive type
    • B65H19/2246—The web roll being driven by a winding mechanism of the nip or tangential drive type and the roll being supported on two rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/14—Mechanisms in which power is applied to web roll, e.g. to effect continuous advancement of web
    • B65H18/20—Mechanisms in which power is applied to web roll, e.g. to effect continuous advancement of web the web roll being supported on two parallel rollers at least one of which is driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/26—Mechanisms for controlling contact pressure on winding-web package, e.g. for regulating the quantity of air between web layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/26—Cutting-off the web running to the wound web roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/13—Means using fluid made only for exhausting gaseous medium pressure arrangement for compensating weight of handled material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/13—Means using fluid made only for exhausting gaseous medium pressure arrangement for compensating weight of handled material
    • B65H2406/131—Means using fluid made only for exhausting gaseous medium pressure arrangement for compensating weight of handled material in combination with rollers or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2408/00—Specific machines
    • B65H2408/20—Specific machines for handling web(s)
    • B65H2408/23—Winding machines
    • B65H2408/232—Winding beds consisting of two rollers
    • B65H2408/2321—Winding beds consisting of two rollers with winding bed supplied with vacuum or compressed air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/12—Density

Definitions

  • the invention relates to a winding machine for winding a running paper web.
  • Claim 1 To the generic term of Claim 1 is referred to.
  • the winding hardness plays a role when winding webs for subsequent processing. Especially at Paper webs, it is very important that the winding hardness a certain one over the entire roll diameter Has course. In general, the winding hardness of one certain initial value fall to a final value. The trash should be as possible from the first to the last layer be even. It is supposed to have a certain gradient have, i.e. not too strong and not too weak. The course of the winding hardness should under no circumstances Have jump points, e.g. a sudden drop.
  • rider rolls are used are arranged parallel to the supporting rollers. With These rider rolls are pressed against the roll out. The contact pressure is controlled, being large at the beginning and decreases with increasing roll weight.
  • the rider roller thus allows line printing and thus also to influence the winding hardness and in the desired To control the senses.
  • one wishes a role very much large diameter so is that Line pressure very large in the final phase of winding. Likewise, the winding tension increases, so that it Tearing the web or crepe folds can occur.
  • Carrier rollers have already been used for this purpose same diameter in different horizontal planes arranged or support rollers of different diameters used. It is also known that when winding on a smaller diameter support roller a harder one Winding receives than when winding on a support roller larger diameter.
  • DE-U 7 310 606 is a winding machine become known, which has two equally large support rollers. One of these support rollers can during the winding process from an upper position above the horizontal plane of the Axis of the other carrier roller at the start of the winding process be lowered. By lowering one from the beginning obtained on tightly wound core.
  • U.S. Patent 2,461,387 describes a winding machine having two has driven carrier rollers of different diameters; the carrier roller with the smaller diameter is one Provide the lining with a higher coefficient of friction and a higher one Speed driven than the other carrier roller. This creates a tension on the outer layer of the Track exercised.
  • DE-OS 27 57 247 relates to a winding machine with support rollers equally large diameter.
  • the control of the winding hardness is done by changing the mutual distance of the Carrier rollers.
  • DE-PS 678 585 describes a winding machine with two Carrier rollers, the first of which is a hard coat and the the second one has a soft coat.
  • the axes of the two Rollers are in the same horizontal plane.
  • DE 38 39 244 describes a winding machine with three Carrier rollers.
  • the first carrier roller is stationary while the two subsequent support rollers can be moved and are wrapped in a support band.
  • Through the support band as well as by changing the positions of the second and the third carrier roller should the winding hardness above Roll diameter can be controlled.
  • This winding machine is extraordinarily complex. She also has a special one serious disadvantage: As soon as the paper roll has grown mainly from the support band worn, it can cause a violent swinging of the Support tape come so that the paper roll to "dance" starts and is catapulted out of bed can.
  • EP 0 157 062 B1 describes a winding machine with two Carrier rollers and a rider roller.
  • Shell surfaces of all of these rollers from a variety of individual fluid chambers formed axially side by side are arranged, and with the formation of a shock their individual outer surfaces, the entire outer surface of the form relevant roller.
  • the support behavior of such Roller is naturally over due to the variety of bumps the web width seen non-uniform.
  • the invention is based on EP-A-0 496 863.
  • This document shows and thus describes a winding machine according to the Preamble of claim 1.
  • the blow box is made by swiveling or moving removable from its working position. The separator is after removing the blow box into their own Working position retractable.
  • a disadvantage of this embodiment is as follows:
  • the blow box has a very substantial build volume as well a correspondingly high weight. You have to be there imagine that he is the entire length of the Extends wrap bed that measure several meters can, and that its weight is many hundreds of kilograms. This requires an elaborate movement mechanism a corresponding drive. It also claims Moving or swiveling the blow box completely considerable space, which is often not available.
  • the invention has for its object a Winding machine according to the preamble of claim 1 create, in which the blow box is stationary, so that no elaborate movement mechanism with associated drive is required, and also a smaller space for the entire machine is sufficient.
  • the inventor has thus proposed a simple solution.
  • the blow box is and remains stationary, at least after the first assembly of the machine. It just becomes a comparatively small part of the blow box can be moved or made movable, namely those wall parts that the relevant sealing element against the relevant support roller wear.
  • the separator becomes like this designed and arranged between the second Carrier roller (which is not wrapped in the web) and the panned or driven away Wall part with associated sealing element in your Working position can be retracted to the web separate, namely each time a web roll is finished wrapped.
  • FIG. 1 shows a winding machine with two support rollers 1, 2, which together are a changing bed to accommodate a Form paper roll 3.
  • the paper roll 3 is created by Winding up a paper web 4. As you can see, the Paper web 4 brought in from the bottom left and wrapped around it first the support roller 1.
  • the paper roll 3 is from a Load or rider roller 5 in a controllable manner loaded to influence the print run.
  • blow box 6 is between the two Carrying rollers a blow box 6. This is only indicated schematically. Sealing elements 7 can also be seen, 8, which is a seal between the relevant walls of the Blow box 6 and the respective support roller 1 or 2 produce.
  • Figure 2 shows an enlarged view of the crucial parts of the subject of Figure 1. Man recognizes the two rollers 1, 2, the dot-and-dash paper roll 3, from the left introduced paper web 4 and the blow box 6.
  • a separating device 9 is another important element recognizable. This has a cutting edge at its left end 9.1 on.
  • the separator 9 is one Swivel center pivotable, which in the present case is pivotable about the axis 2.1 of the roller 2.
  • the center of the pivot could also be in relation to the axis 2.1 be a bit off. As you can see, it is Separating device 9 substantially in the shape of a circular arc designed.
  • the details of the blow box are even more detailed Figure 3 can be seen. You can see the blow box there again 6, and the two seals 7, 8.
  • the seal 7 is carried by a component 6.1, and the seal 8 by a component 6.2.
  • the two components 6.1 and 6.2 are Parts of the carrier box 6. They are both in this Side view essentially U-shaped to the Increase stiffness. However, this is not mandatory required.
  • the two components 6.1 and 6.2 are Components of the blow box 6. They are in the following as "Supporting parts" are referred to.
  • Support part 6.1 is displaceable, namely against the support roller 2 out. Note the position shown in dashed lines of support part 6.1. Support part 6.2, however, is pivotable on The main part of the box 6 is mounted - see swivel axis 6.3. Support part 6.2 can be shown in dash-dotted lines Position swiveled and is thus in the Inside the main part of the blow box 6.
  • a Guide device 10 is provided. This includes an im Cross section of hairpin-shaped guide bush. This spans the entire width of the two Carrier rollers 1, 2. It also includes guide rollers, which in the guide bush 10.1 can run, and the over here Connection lever, not shown, on the support part 6.1 attack.
  • the lower leg of the guide bush 10.1 has a cranked end 10.2. This serves the support part 6.1 in the end of its stroke easily to raise.
  • the support part 6.1 consists exclusively from the U-shaped structure.
  • the under this support part 6.1 located wall 6.4 is constantly stationary. Between the U-shaped Support part 6.1 and the wall below 6.4 a seal 6.5 is provided.
  • the support member 6 includes not only the U-shaped structure, but also a console 6.6.
  • the console is 6.6 via the swivel axis 6.3 to an underlying, Fixed wall 6.7 of the support box 6 articulated.
  • a wall 11 can be seen in FIG. 3 connects the fixed wall 6.4 with the fixed one Wall 6.7 of the blow box. It also extends over the entire length of the blow box. It is in the present Perforated trap, through a variety of Holes. The holes are in this case over the Surface of the connecting wall 11 distributed absolutely evenly.
  • the connecting wall 11 has in the present case perform the following functions:
  • a third, very important function is as follows: It happens from time to time with carrier roller winding machines Tear off the paper web. The paper web falls in this Trap in the blow box; this paper waste has to go so quickly be removed as possible.
  • the connecting wall 11 serves in this case collecting such paper waste. If the paper waste is on the connecting wall 11, it can it is much easier to get through one of the two faces of the Remove the blow box 6 as if it were on the bottom of the Blow box 6 would be.
  • the creation of the Paper waste could also be automated for example by means of a scratch or one revolving conveyor belt.
  • the connecting wall 11 could be a Blinds with which it is possible to assign the individual compressed air flows through the holes of the Pass through connecting wall 11 in its throughput to change arbitrarily.
  • FIG. 4 Another embodiment of the invention is shown in FIG. 4 shown. You can see the blow box 6 there as well the two seals 7, 8.
  • pivotable support part 6.1 - see pivot axis 6.3 - stored. Note that Position of the supporting part 6.1 shown in dashed lines. Support part 6.2, however, is slidable on the support box attached, in the vertical direction. Support part 6.2 can be moved along the arrow. This has the Advantage that when the support drum 2 in the dash-dotted position reached - e.g. swung away must be because the paper web breaks and the carrier drum is packed - the sealing element 8 automatically with the Carrier drum 2 is moved down.
  • blow box 6 according to FIG. 4 Stiffening ribs 14 on the fixed wall 6.4 connect to the fixed wall 6.7 of the blow box.
  • the air supply line 6.8 of the blow box Sheets 15 attached with which the air supply line in Blow box is attached is attached.
  • connecting wall 11 provided which is perforated and is used in the event of demolition the paper web to catch the paper scraps.
  • the connecting wall 11 is between the fixed Walls 6.4 and 6.7 arranged so inclined that the Slide the remaining pieces of paper downwards in the blow box and sit in front of the wall 6.4 Collect opening 16. The paper scraps can then be opened the flap 17 arranged in front of the opening 16 easily be removed.

Landscapes

  • Winding Of Webs (AREA)
  • Replacement Of Web Rolls (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Basic Packing Technique (AREA)
  • Paper (AREA)

Claims (10)

  1. Bobineuse à cylindres porteurs pour enrouler des bandes de marchandise, en particulier des bandes de papier,
    1.1 comportant deux cylindres porteurs (1, 2) qui forment un plateau d'enroulement destiné à recevoir un rouleau (3) à former à partir de la bande de marchandise (4) ;
    1.2 l'un des deux cylindres porteurs (1, 2) étant entouré par la bande arrivant d'en bas ("premier cylindre porteur") ;
    1.3 comportant une caisse de soufflage (6) qui est agencée sur le côté des cylindres porteurs (1, 2) opposé au plateau d'enroulement et qui comporte une alimentation en air comprimé (6.8) ;
    1.4 la caisse de soufflage (6) comportant deux parois dont chacune peut être étanchéifiée par des éléments d'étanchéité (7, 8) par rapport à la surface latérale de l'un des deux cylindres porteurs (1, 2) ;
    1.5 un dispositif séparateur (9) étant prévu et pouvant se déplacer dans une position de travail lors de l'achèvement d'un rouleau de bande de marchandise (3) ;
    caractérisée par les caractéristiques suivantes :
    1.6 la caisse de soufflage (6) est fixe ;
    1.7 les zones de paroi (6.1, 6.2) de la caisse de soufflage (6) sont des parties porteuses qui portent directement les éléments d'étanchéité (7, 8) et elles peuvent être retirées, conjointement aux éléments d'étanchéité (7, 8), hors des positions d'étanchéité ;
    1.8 le dispositif séparateur (9) peut être mis dans sa position de travail entre la surface latérale du deuxième cylindre porteur (2) et la partie porteuse associée (6.2) de la caisse de soufflage.
  2. Bobineuse à cylindres porteurs selon la revendication 1, caractérisée en ce que les parties porteuses (6.1, 6.2) sont pivotantes, conjointement aux éléments d'étanchéité (7, 8), autour d'axes qui s'étendent parallèlement aux cylindres porteurs (1, 2).
  3. Bobineuse à cylindres porteurs selon la revendication 1, caractérisée en ce que les parties porteuses (6.1, 6.2) sont translatables avec les éléments d'étanchéité (7, 8).
  4. Bobineuse à cylindres porteurs selon l'une des revendications 1 à 3, caractérisée en ce que la partie porteuse (6.1) associée au premier cylindre porteur (1) est translatable et en ce que la partie porteuse (6.2) associée au deuxième cylindre porteur (2) est pivotante.
  5. Bobineuse à cylindres porteurs selon l'une des revendications 1 à 3, caractérisée en ce que la partie porteuse (6.1) associée au premier cylindre porteur (1) est pivotante et en ce que la partie porteuse (6.2) associée au deuxième cylindre porteur (2) est translatable.
  6. Bobineuse à cylindres porteurs selon l'une des revendications 1 à 5, caractérisée en ce qu'il est prévu une paroi de liaison (11) entre les parties de paroi fixes (6.4, 6.7).
  7. Bobineuse à cylindres porteurs selon la revendication 6, caractérisée en ce que la paroi de liaison (11) est fixée aux parties de paroi fixes (6.4, 6.7).
  8. Bobineuse à cylindres porteurs selon la revendication 6 ou 7, caractérisée en ce qu'au moins l'une des parties de paroi fixes (6.4, 6.7) comporte une ouverture (16) qui peut être fermée.
  9. Bobineuse à cylindres porteurs selon la revendication 8, caractérisée en ce que la paroi de liaison (11) entre les parties de paroi fixes (6.4, 6.7) est agencée inclinée de telle sorte que des restes de papier recueillis dessus glissent automatiquement vers l'ouverture (16) pratiquée dans la partie de paroi fixe.
  10. Bobineuse à cylindres porteurs selon l'une des revendications 6 à 9, caractérisée en ce que la paroi de liaison comporte des perforations et est agencée au-dessus des alimentations en air comprimé (6.8) sur la caisse de soufflage (6).
EP96114134A 1995-10-19 1996-09-04 Bobineuse à cylindres porteurs Expired - Lifetime EP0769465B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19538973A DE19538973A1 (de) 1995-10-19 1995-10-19 Tragwalzen-Wickelmaschine
DE19538973 1995-10-19

Publications (3)

Publication Number Publication Date
EP0769465A2 EP0769465A2 (fr) 1997-04-23
EP0769465A3 EP0769465A3 (fr) 1997-11-19
EP0769465B1 true EP0769465B1 (fr) 2001-03-21

Family

ID=7775286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96114134A Expired - Lifetime EP0769465B1 (fr) 1995-10-19 1996-09-04 Bobineuse à cylindres porteurs

Country Status (7)

Country Link
US (1) US5848760A (fr)
EP (1) EP0769465B1 (fr)
JP (1) JPH09124196A (fr)
AT (1) ATE199878T1 (fr)
CA (1) CA2188342A1 (fr)
DE (2) DE19538973A1 (fr)
ES (1) ES2156243T3 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19729532A1 (de) * 1997-07-10 1999-01-21 Voith Sulzer Finishing Gmbh Rollenwickeleinrichtung, insbesondere für eine Rollenschneideinrichtung
DE19811093A1 (de) * 1998-03-13 1999-09-16 Voith Sulzer Papiertech Patent Rollenwickeleinrichtung
DE19818944A1 (de) * 1998-04-28 1999-11-11 Voith Sulzer Papiertech Patent Rollenwickeleinrichtung, insbesondere für einen Rollenschneider
DE19837760A1 (de) * 1998-08-20 2000-03-02 Voith Sulzer Papiertech Patent Rollenwickeleinrichtung
DE19842188A1 (de) 1998-09-15 2000-03-23 Voith Sulzer Papiertech Patent Rollenwickeleinrichtung
DE19901112B4 (de) * 1999-01-14 2004-04-01 Voith Paper Patent Gmbh Rollenwickelvorrichtung
CN106241450A (zh) * 2016-08-17 2016-12-21 长兴诺鑫纺织机械有限公司 一种具有自动纠偏功能的打卷装置

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE678585C (de) * 1934-04-06 1939-07-18 Jagenberg Werke Ag Doppeltragwalzenroller zum Aufwickeln von Papier, Karton u. dgl.
US2461387A (en) * 1947-06-26 1949-02-08 Marshall Field & Company Cloth roll attachment for lace looms
DE1047001B (de) * 1957-09-21 1958-12-18 Goebel Gmbh Maschf Einrichtung zum Entlasten des Eigengewichtes von auf Tragwalzen liegenden Wickelrollen aus Papier-, Karton- oder aehnlichen Werkstoffbahnen
US3346209A (en) * 1965-09-17 1967-10-10 Beloit Corp Winder
US3515183A (en) * 1968-08-14 1970-06-02 Purex Corp Ltd Winders for paper machines
US3497151A (en) * 1968-08-14 1970-02-24 Ontario Paper Co Ltd Paper machine winder
FI763709A (fi) * 1976-12-28 1978-06-29 Waertsilae Oy Ab Foerfarande foer reglering av funktionen hos en baervalsrullmaskin
US4541585A (en) * 1983-09-06 1985-09-17 Beloit Corporation Compliant drum and rider roll
EP0140168A3 (fr) * 1983-10-12 1985-06-05 Maschinenfabrik Rieter Ag Procédé et dispositif pour la formation d'un enroulement d'ouate
JPS60232358A (ja) * 1984-05-01 1985-11-19 Kawanoe Zoki Kk ウエブ巻取装置におけるウエブの切断装置
DE3839244C2 (de) * 1988-02-24 1993-12-09 Webasto Ag Fahrzeugtechnik Heizgerät, insbesondere Fahrzeugzusatzheizgerät
DE4110047A1 (de) * 1990-08-23 1992-10-01 Jagenberg Ag Tragwalzen-wickelmaschine
DE9212571U1 (de) * 1992-06-15 1992-11-12 Jagenberg AG, 4000 Düsseldorf Tragwalzen-Wickelmaschine
FI103398B (fi) * 1993-06-30 1999-06-30 Metso Paper Inc Kantotelarullain
FI92995C (fi) * 1993-06-30 1995-02-10 Valmet Paper Machinery Inc Kantotelarullain
ATE168351T1 (de) * 1994-01-31 1998-08-15 Voith Sulzer Papiermasch Gmbh Wickelmaschine zum aufwickeln einer laufenden papierbahn

Also Published As

Publication number Publication date
ATE199878T1 (de) 2001-04-15
DE59606619D1 (de) 2001-04-26
EP0769465A2 (fr) 1997-04-23
JPH09124196A (ja) 1997-05-13
EP0769465A3 (fr) 1997-11-19
DE19538973A1 (de) 1997-04-24
US5848760A (en) 1998-12-15
CA2188342A1 (fr) 1997-04-20
ES2156243T3 (es) 2001-06-16

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