EP0694356B1 - Procédé et dispositif de correction de l'ovalisation de cylindres de coulée continue de bande métallique - Google Patents
Procédé et dispositif de correction de l'ovalisation de cylindres de coulée continue de bande métallique Download PDFInfo
- Publication number
- EP0694356B1 EP0694356B1 EP95420218A EP95420218A EP0694356B1 EP 0694356 B1 EP0694356 B1 EP 0694356B1 EP 95420218 A EP95420218 A EP 95420218A EP 95420218 A EP95420218 A EP 95420218A EP 0694356 B1 EP0694356 B1 EP 0694356B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- cooling
- roll body
- port
- discharge
- 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
Links
- 238000000034 method Methods 0.000 title claims description 15
- 229910052751 metal Inorganic materials 0.000 title claims description 13
- 239000002184 metal Substances 0.000 title claims description 13
- 238000009749 continuous casting Methods 0.000 title claims description 5
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 238000005266 casting Methods 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims description 44
- 239000002826 coolant Substances 0.000 claims description 5
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000012809 cooling fluid Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 235000021183 entrée Nutrition 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/068—Accessories therefor for cooling the cast product during its passage through the mould surfaces
- B22D11/0682—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the casting wheel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/08—Lubricating, cooling or heating rolls internally
Definitions
- the invention relates to a method and a device for correcting thermal ovalization (or runout) appearing on cylinders continuous metal strip casting.
- a continuous metal strip casting machine generally contains two identical cylinders located face to face, separated by a space of the thickness of the metal strip to be produced and turning in the opposite direction one of the other.
- the liquid metal is fed on one side of the space while the strip comes out on the other side at its nominal thickness.
- Figures 1 (longitudinal section) and 2 (cross section) give the general structure of a cylinder.
- Cooling is usually carried out using a cooling (generally water) circulating in at least one circuit inside the cylinder body (1).
- a cooling generally water
- This circuit includes at least one cold water supply hole (3), under shape of a tube drilled in the cylinder body (1), parallel to its axis, opening to the outside by one of its ends, the other being closed, and extending to the right of the hoop (2) over its entire width.
- a plurality of smaller diameter tubes (4) connect each hole supply (3) to a distribution manifold (5) sort of groove located under the hoop (2) and substantially parallel to the supply tube (3); each collector supplies water to a cooling device proper comprising a network of small channels (5) machined to the peripheral surface of the cylinder body (1) and located under the hoop in a transverse plane; the water circulates there and comes into thermal contact with the hoop and ensures its cooling.
- the water After the water has heated up, it is removed using a identical to the power supply. It includes (see part low of fig. 1 and fig. 2) a water drain collector (7) hot, a plurality of small diameter tubes (8) connecting it to the tube evacuation (9).
- a cylinder body has two or three or four water supply circuits and as many drainage circuits interconnected by the channels (6) of the cooling device.
- the reciprocal arrangement of the cold and hot water circuits is good visible in particular in fig. 2 which represents the case of 2 circuits. We see their interconnection and their alternate and offset arrangement one relative to the other by 90 °. The arrows illustrate the meaning of water circulation. In the case of three or four circuits, the offset is 60 ° or 45 °
- the cold water arriving in one of the distribution collectors (5) is then distributed in the cooling channels (6) located on the on the other side of the collector (5), heats up and is evacuated by the collectors (7) which thus collect water from two collectors distribution (5) located on either side.
- a cooling device of this type is described in the patent FR-A-2 217 098. It shows a cylinder comprising a core (1) surrounded a hoop (7), the whole being cooled by a circulation of water in channels (2, 3, 4, 6) formed in said core (1) and opening into grooves (5) located at the core-hoop interface.
- the Applicant has sought a method and a device aimed at reducing temperature differences in the cylinder which is effective and easy to carry out or to implement and inexpensive.
- the invention is a method of cooling continuous rolls of metal strip using a fluid
- said metal cylinders comprising a cylinder body and a metallic hoop consisting essentially of a tube or an envelope metallic, the inner face of which surrounds said body, the other face used to receive liquid metal and to produce the strip by cooperation of two cylinders, said cylinder body comprising at minus a cooling circuit leading to the outside of the body cylinder by two inlet / outlet ends and comprising at least one cold fluid supply device (usually water), a actual cooling device where the fluid is in contact thermal with the underside of the hoop and a device evacuation of the heated fluid in contact with the hoop, characterized in which we periodically reverse the direction of circulation of the fluid in the cylinder body, the cold fluid supply device becoming the hot fluid evacuation device and vice versa.
- the invention is particularly suitable for cylinders having the configuration described above using fig. 1 and 2, their body of cylinder with two or three or four feed devices cold water alternated with as many hot water evacuation devices, these devices being offset by 90 ° (two devices), by 60 ° (three devices) or 45 ° (four devices) and connected by a device proper cooling.
- Continuous strip casting generally takes place between two cylinders identical, reversing the direction of the coolant according to the invention is advantageously practiced on the two cylinders. Such a process is also applicable to casting on a single cylinder by example, film casting.
- the process according to the invention is particularly advantageous when one runs thin strips for example from 1 to 12 mm thick, or even more thin, specifically in the usual range of thickness from 5 to 12 mm where the process is very efficient, or even in the area of the weak thicknesses for example from 1 to 5 mm for which a cylinder runout is all the more harmful as the thickness is low. It is particularly suitable for casting aluminum strip or its alloys.
- the frequency of reversing the direction of water circulation must be set in depending on the characteristics of the installation, for example diameter of cylinders, coolant flow etc ...
- the method according to the invention has been applied to a 8 mm thick aluminum strip continuous casting installation, on cylinders with an outside diameter of 96 cm, the hoop of which had a 8 cm thick, and having an internal cooling circuit identical to that given in fig. 1 and 2.
- the buffer tank can receive the hot fluid if it is large sufficient to cool it or if it has a autonomous cooling device.
- valve V is assigned to supply the cylinder with cold fluid
- valve W is assigned to the evacuation of the fluid warmed up.
- the simultaneous operation of the three-way valves makes it possible to reverse the direction of circulation of the fluid in the cylinder without modifying the circuit fluid from the pump and discharge to the basin.
- maneuvers can advantageously be automated or managed by microprocessor, computer ... etc ...
- the casting machine has two cylinders (upper and lower)
- the hot fluid evacuation circuit can be connected to said second cylinder in diversion on track V3 or W2 of the valves respective V and W which already collect the hot fluid from the first cylinder.
- FIG. 3 illustrates a device according to the invention for a casting machine comprising two cylinders: C (upper cylinder), D (lower cylinder).
- C1, C2 and D1, D2 represent the input / output ends, interchangeable during the reversal of direction of the fluid, of the fluid cooling circuit located inside each of the cylinders C and D respectively.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Metal Rolling (AREA)
Description
- un bassin tampon contenant ledit fluide,
- au moins une pompe en soutirant le fluide et alimentant un circuit de fluide
- ledit circuit de fluide comprenant une première vanne à trois voies dont une première voie V1 est alimentée par la pompe, optionnellement par l'intermédiaire d'un débimètre B, une deuxième voie V2 est reliée d'une part à une des extrémités dudit circuit de refroidissement d'autre part à une première voie W1 d'une deuxième vanne à trois voies W, une troisième voie V3 est reliée d'une part à l'autre extrémité dudit circuit de refroidissement d'autre part à une deuxième voie W2 de la vanne W, la troisième voie W3 de W étant reliée à un conduit d'évacuation du fluide chaud.
C1, C2 et D1, D2 représentent les extrémités d'entrée/sortie, interchangeables lors de l'inversion de sens du fluide, du circuit de refroidissement par fluide situé à l'intérieur respectivement de chacun des cylindres C et D.
- en R, le bassin tampon de fluide de refroidissement,
- en P1 et P2, deux pompes de soutirage branchées en parallèle,
- en A des vannes d'arrêt,
- en V et W les vannes trois voies avec leurs voies respectives V1, V2, V3, W1, W2, W3 ; en particulier on voit que V1 est branchée sur le refoulement des pompes P par l'intermédiaire d'un débimètre D isolé par deux vannes d'arrêt (ce débit-mètre peut être court-circuité par un circuit S), que V2 et W1 sont reliées au point d'entrée/sortie C2 de C tandis que V3 et W2 sont reliées au point d'entrée sortie C1 et que W3 est relié à l'évacuation du fluide qui retourne au bassin R ;
- en V' et W' les repères correspondant au cylindre D ; ils ont les mêmes significations et fonctions que pour le cylindre C.
Claims (11)
- Procédé de refroidissement de cylindres de coulée continue de bande métallique à l'aide d'un fluide, lesdits cylindres métalliques comprenant un corps de cylindre (1) et une frette métallique (2) constituée essentiellement d'un tube ou d'une enveloppe métallique dont la face intérieure ceinture ledit corps de cylindre (1), l'autre face recevant du métal liquide et produisant la bande par coopération de deux cylindres, ledit corps de cylindre (1) comportant au moins un circuit de refroidissement débouchant à l'extérieur du corps de cylindre par deux extrémités d'entrée/sortie et comprenant au moins un dispositif d'alimentation en fluide froid, un dispositif de refroidissement proprement dit où le fluide est en contact thermique avec la face inférieure de la frette et un dispositif d'évacuation du fluide réchauffé au contact de la frette, caractérisé en ce qu'on inverse périodiquement le sens de circulation dudit fluide dans le corps du cylindre, le dispositif d'alimentation en fluide froid devenant le dispositif d'évacuation de fluide chaud, et inversement.
- Procédé selon la revendication 1, caractérisé en ce que le dispositif d'alimentation en fluide froid comporte au moins un tube d'amenée de fluide (3) percé dans le corps de cylindre (1) parallèlement à son axe et débouchant à l'extérieur par une de ses extrémités, une pluralité de tubes (4) de plus petits diamètres reliant le tube d'amenée (3) à un collecteur de distribution (5) substantiellement parallèle audit tube (3) et situé sous la frette (2), un dispositif de refroidissement comportant un réseau de petits canaux (6) usinés à la surface périphérique du corps de cylindre (1) dans un plan transversal à son axe et permettant au fluide d'entrer en contact thermique avec la frette (2), un dispositif d'évacuation du fluide identique audit dispositif d'alimentation et comportant successivement un collecteur d'évacuation (7) relié à une pluralité de tubes de petits diamètres (8) reliés eux-mêmes à un tube d'évacuation (9) débouchant à l'extérieur, ledit dispositif de refroidissement reliant le collecteur de distribution (5) et le collecteur d'évacuation (7).
- Procédé selon la revendication 2, caractérisé en ce que le corps de cylindre (1) comporte deux dispositifs d'alimentation en fluide et deux dispositifs d'évacuation alternés et décalés de 90°, reliés par les dispositifs de refroidissement (6).
- Procédé selon la revendication 2, caractérisé en ce que le corps de cylindre (1) comporte trois dispositifs d'alimentation en fluide et trois dispositifs d'évacuation alternés et décalés de 60°, reliés par les dispositifs de refroidissement (6).
- Procédé selon la revendication 2, caractérisé en ce que le corps de cylindre (1) comporte quatre dispositifs d'alimentation en fluide et quatre dispositifs d'évacuation alternés et décalés de 45°, reliés par les dispositifs de refroidissement (6).
- Dispositif de circulation du fluide de refroidissement circulant dans au moins un cylindre destiné à la coulée continue contenant au moins un circuit de refroidissement ledit circuit débouchant à l'extérieur par deux extrémités d'entrée/sortie, permettant en particulier de pratiquer le procédé de l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il comporte un dispositif d'inversion du sens de circulation du fluide de refroidissement.
- Dispositif selon la revendication 6, caractérisé en ce qu'il comprend un bassin tampon (R) contenant ledit fluide, au moins une pompe (P) en soutirant le fluide et alimentant un circuit de fluide comprenant une première vanne à trois voies dont une première voie V1 est alimentée par la pompe, une deuxième voie V2 est reliée d'une part à une des extrémités dudit circuit de refroidissement, d'autre part à une première voie W1 d'une deuxième vanne à trois voies W, une troisième voie V3 est reliée d'une part à l'autre extrémité dudit circuit de refroidissement, d'autre part à une deuxième voie W2 de la vanne W, la troisième voie W3 de W étant reliée à un conduit d'évacuation du fluide chaud.
- Dispositif selon la revendication 7, caractérisé en ce qu'il comprend deux cylindres de coulée dont les extrémités d'entrée/sortie du circuit de refroidissement de chacun d'eux sont branchées en dérivation respectivement sur les voies V2 ou W1 d'une part, V3 et W2 d'autre part.
- Dispositif selon la revendication 7, caractérisé en ce qu'il comprend deux cylindres de coulée, le premier étant branché sur le circuit comportant les vannes trois voies V et W comme indiqué dans la revendication 4, le deuxième étant branché sur un deuxième circuit identique comportant des vannes trois voies V' et W', les deux dits circuits étant montés en dérivation sur le refoulement de la pompe.
- Dispositif selon l'une quelconque des revendications 7 à 9, caractérisé en ce que les vannes trois voies sont manoeuvrées simultanément et de préférence sont automatisées.
- Dispositif selon l'une quelconque des revendications 7 à 10, caractérisé en ce que le circuit de refroidissement d'un cylindre est celui décrit dans les revendications 1 à 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9409667A FR2723014B1 (fr) | 1994-07-29 | 1994-07-29 | Procede et dispositif de correction de l'ovalisation de cylindres de coulee continue de bande metallique |
| FR9409667 | 1994-07-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0694356A1 EP0694356A1 (fr) | 1996-01-31 |
| EP0694356B1 true EP0694356B1 (fr) | 2000-03-01 |
Family
ID=9466065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95420218A Expired - Lifetime EP0694356B1 (fr) | 1994-07-29 | 1995-07-26 | Procédé et dispositif de correction de l'ovalisation de cylindres de coulée continue de bande métallique |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US5642772A (fr) |
| EP (1) | EP0694356B1 (fr) |
| JP (1) | JPH0857598A (fr) |
| KR (1) | KR100200984B1 (fr) |
| AT (1) | ATE189982T1 (fr) |
| BR (1) | BR9503511A (fr) |
| CZ (1) | CZ290735B6 (fr) |
| DE (1) | DE69515225T2 (fr) |
| FR (1) | FR2723014B1 (fr) |
| MY (1) | MY113719A (fr) |
| NO (1) | NO310396B1 (fr) |
| RU (1) | RU2138362C1 (fr) |
| TW (1) | TW282426B (fr) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPO188696A0 (en) * | 1996-08-27 | 1996-09-19 | Bhp Steel (Jla) Pty Limited | Twin roll casting |
| FR2763602B1 (fr) * | 1997-05-20 | 1999-07-09 | Pechiney Rhenalu | Procede de fabrication de bandes en alliages d'aluminium par coulee continue mince entre cylindres |
| AUPO832897A0 (en) * | 1997-07-30 | 1997-08-28 | Bhp Steel (Jla) Pty Limited | Twin roll casting |
| FR2799399B1 (fr) * | 1999-10-06 | 2002-02-08 | Pechiney Rhenalu | Cylindre de coulee continue de bande metallique comprenant un circuit de refroidissement |
| US6435258B1 (en) * | 2000-04-26 | 2002-08-20 | Honda Giken Kogyo Kabushiki Kaisha | Method and apparatus for cooling mold |
| US6374903B1 (en) * | 2000-09-11 | 2002-04-23 | Ag Industries, Inc. | System and process for optimizing cooling in continuous casting mold |
| FR2832497B1 (fr) * | 2001-11-19 | 2004-05-07 | Pechiney Rhenalu | Bandes en alliage d'aluminium pour echangeurs thermiques |
| RU2226447C2 (ru) * | 2002-05-27 | 2004-04-10 | Закрытое акционерное общество "Ново-Краматорский машиностроительный завод" | Охлаждаемый ролик |
| JP2006231378A (ja) * | 2005-02-25 | 2006-09-07 | Katagi Aluminum Products Ltd | 連続鋳造によるアルミニウム合金板の製造方法 |
| EP1844880A1 (fr) * | 2006-04-12 | 2007-10-17 | So & So Sommerhofer OEG | Coulee en bande |
| US8607848B2 (en) * | 2008-08-05 | 2013-12-17 | Nucor Corporation | Method for casting metal strip with dynamic crown control |
| ES2397725B1 (es) * | 2010-03-23 | 2014-01-17 | Inasa Foil, S.A. | Sistema de refrigeración de rodillos laminadores. |
| AT509688B1 (de) * | 2010-03-26 | 2012-02-15 | Siemens Vai Metals Tech Gmbh | Lager und dreheinführung für eine gekühlte rolle |
| US8505611B2 (en) | 2011-06-10 | 2013-08-13 | Castrip, Llc | Twin roll continuous caster |
| DE102011055066A1 (de) * | 2011-11-04 | 2013-05-08 | Hydro Aluminium Rolled Products Gmbh | Walze mit Kühlsystem |
| TWI635917B (zh) * | 2013-06-10 | 2018-09-21 | 奧地利商百德福鋼帶公司 | Heatable or chillable steering drum for belt casting equipment |
| CN104368605A (zh) * | 2014-11-19 | 2015-02-25 | 辽宁科技大学 | 一种适用于铸轧薄宽板带的铸轧辊冷却水道 |
| US20170144218A1 (en) * | 2015-11-20 | 2017-05-25 | Nucor Corporation | Method for casting metal strip with crown control |
| CN105328146A (zh) * | 2015-12-15 | 2016-02-17 | 西南铝业(集团)有限责任公司 | 一种合金铸造冷却水系统 |
| AU2018283285B2 (en) | 2017-06-15 | 2024-02-15 | Nucor Corporation | Method for casting metal strip with edge control |
| RU2770927C1 (ru) * | 2020-12-14 | 2022-04-25 | Александр Алексеевич Семенов | Устройство охлаждения для ролика непрерывного литья |
| RU2767120C1 (ru) * | 2020-12-21 | 2022-03-16 | Александр Алексеевич Семенов | Охлаждаемый ролик машины непрерывного литья заготовок |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2217098A1 (en) * | 1973-02-13 | 1974-09-06 | Scal Gp Condit Aluminium | Continuous casting appts of improved output capacity - by lining surfaces in contact with liq metal with a highly heat conductive material eg copper (alloys) |
| FR2587247B1 (fr) * | 1985-09-17 | 1988-08-12 | Siderurgie Fse Inst Rech | Cylindre pour coulee continue entre cylindres, a circulation de fluide de refroidissement |
| JPS62168650A (ja) * | 1986-01-20 | 1987-07-24 | Daido Steel Co Ltd | 連続鋳造機用ロ−ル |
| CH674166A5 (fr) * | 1986-12-22 | 1990-05-15 | Lauener Eng Ag | |
| SU1560376A1 (ru) * | 1987-12-14 | 1990-04-30 | Андроповский авиационный технологический институт | Водоохлаждаемый ролик |
| GB9100151D0 (en) * | 1991-01-04 | 1991-02-20 | Davy Distington Ltd | Strip caster roll |
| SE501633C2 (sv) * | 1992-03-30 | 1995-04-03 | Dalforsaan Ab | Kyld stödrulle |
-
1994
- 1994-07-29 FR FR9409667A patent/FR2723014B1/fr not_active Expired - Fee Related
-
1995
- 1995-06-30 MY MYPI95001815A patent/MY113719A/en unknown
- 1995-06-30 TW TW084106757A patent/TW282426B/zh active
- 1995-07-06 NO NO19952681A patent/NO310396B1/no unknown
- 1995-07-10 US US08/500,155 patent/US5642772A/en not_active Expired - Fee Related
- 1995-07-26 EP EP95420218A patent/EP0694356B1/fr not_active Expired - Lifetime
- 1995-07-26 DE DE69515225T patent/DE69515225T2/de not_active Expired - Fee Related
- 1995-07-26 AT AT95420218T patent/ATE189982T1/de not_active IP Right Cessation
- 1995-07-27 KR KR1019950022482A patent/KR100200984B1/ko not_active Expired - Fee Related
- 1995-07-28 JP JP7193428A patent/JPH0857598A/ja active Pending
- 1995-07-28 RU RU95113729/02A patent/RU2138362C1/ru not_active IP Right Cessation
- 1995-07-28 CZ CZ19951957A patent/CZ290735B6/cs not_active IP Right Cessation
- 1995-07-31 BR BR9503511A patent/BR9503511A/pt not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR960003855A (ko) | 1996-02-23 |
| RU2138362C1 (ru) | 1999-09-27 |
| EP0694356A1 (fr) | 1996-01-31 |
| TW282426B (fr) | 1996-08-01 |
| NO952681L (no) | 1996-01-30 |
| JPH0857598A (ja) | 1996-03-05 |
| DE69515225D1 (de) | 2000-04-06 |
| NO952681D0 (no) | 1995-07-06 |
| FR2723014A1 (fr) | 1996-02-02 |
| ATE189982T1 (de) | 2000-03-15 |
| MY113719A (en) | 2002-05-31 |
| BR9503511A (pt) | 1996-07-30 |
| KR100200984B1 (ko) | 1999-06-15 |
| CZ195795A3 (en) | 1996-02-14 |
| FR2723014B1 (fr) | 1996-09-20 |
| CZ290735B6 (cs) | 2002-10-16 |
| DE69515225T2 (de) | 2000-08-10 |
| US5642772A (en) | 1997-07-01 |
| NO310396B1 (no) | 2001-07-02 |
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