EP0997203B1 - Verfahren und System zur Regelung von Kühlstrecken - Google Patents
Verfahren und System zur Regelung von Kühlstrecken Download PDFInfo
- Publication number
- EP0997203B1 EP0997203B1 EP99119331A EP99119331A EP0997203B1 EP 0997203 B1 EP0997203 B1 EP 0997203B1 EP 99119331 A EP99119331 A EP 99119331A EP 99119331 A EP99119331 A EP 99119331A EP 0997203 B1 EP0997203 B1 EP 0997203B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling
- temperature
- strip
- calculation
- cooling path
- 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
- 238000001816 cooling Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 76
- 230000008569 process Effects 0.000 claims abstract description 49
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims description 19
- 238000005096 rolling process Methods 0.000 claims description 11
- 230000006978 adaptation Effects 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000007363 regulatory process Effects 0.000 claims description 2
- 230000003466 anti-cipated effect Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 5
- 238000013459 approach Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000013643 reference control Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
Definitions
- the invention relates to a method and a system for control a cooling section, in particular the cooling section of a Plant for rolling steel sheets and strips.
- the classical concept is the modeling of the System in the form of ideal band points.
- the band point at the modeling of a band point is considered that the band point by heat conduction, convection and radiation Exchanging energy with the environment. Furthermore, by microstructural transformation produces internal energy.
- For modeling the band point becomes the transient in the band thickness direction solved one-dimensional heat equation of FOURIER.
- the geometric limit of modeling is the location of the model Fertigidesnpyrometers, so the entry point of the Vietnamese Bandluis in the cooling section, as well as the installation site of the reel pylon. Between these two places can by locally distributed control interventions the target temperature of the band.
- the process model is integrated into a control loop. on the other hand it is separate from it.
- the inlet of the belt comes before the inlet of the belt to be cooled to a default the positioning systems of the cooling line (Setup), where a Pre-control and regulation during rolling only for Control of remaining disturbances and inaccurate setup settings serve.
- Setup the positioning systems of the cooling line
- the first case a retroactive accounting of this segment with the help of Process model performed.
- the resulting difference between measured and calculated reel temperature is adapted and for a subsequent adjusted setting the positioning systems under consideration of the current process state (Finishing temperature, belt speed, etc.). This calculation process is performed during the rolling process cyclically repeated.
- the model adaptation is known to, the prediction accuracy to increase the cooling model.
- the Calculation result of the model constantly with the actual, measured cooling results and an error minimization carried out.
- the proposed method is based on the basic idea the total system of the cooling section is not considered a sum of individual Band points or segments to consider, but the temperature condition of the strip over the length of the cooling section, i.e. the temperature curve falling due to the influence of the cooling effect, by means of a mathematical process model continuously to calculate or observe this temperature curve to compare with a reference temperature curve and the deviations over the cooling length individual trimregeln.
- the model that underlies the calculation is hereby preferably adapted continuously.
- the calculation of the band temperature curve takes place realistically.
- the reference temperature profile is calculated in advance.
- process parameters iS. of claim 1 become understood the current settings of the cooling section. This are recordable, the number of activated chilled beams and / or the amount or the speed of the cooling water and the cooling water temperature. The regulation of these actuators The cooling section is done individually and in adaptation to the reference temperature curve and thus allows one greater speed and flexibility of the individual actuators.
- the properties of the band to be cooled such as the belt speed, the belt thickness, the finishing temperature or the material properties of the tape.
- the actual measured temperature measurement value T meas or the given reference temperature T ref is preferably the actual or setpoint temperature of the material to be cooled shortly before entry into the coiling device or at the outlet of the cooling device.
- the cooling path comprises a plurality of cooling devices.
- upper and lower actuators of the cooling devices independently for separate cooling of the Band upper or lower band are regulated.
- thermo-physical and fluid-dynamic Relationships By including thermo-physical and fluid-dynamic Relationships is an accurate process image in the rule cycle guaranteed.
- FIG. 1 shows a schematic overview of a laminar band cooling system 1, which is located on the outlet roller table of a hot rolling wide strip line between the last rolling stand 2 of Finishing line and the driver 3a or reel 3b is located.
- the Strip cooling system consists of several cooling devices 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h and 1i together independently each other and their actuators in each case with regard to Bandober- and bottom are separately controlled.
- a first pyrometer 5 for measuring the belt temperature.
- a second pyrometer 6 is just before Driver 3a or reel 3b.
- a strip temperature profile is calculated (observed) by means of the cooling model, and the measured reel temperature T meas is compared with the corresponding calculated temperature T calc .
- the measured reel temperature T meas is understood to mean the strip temperature which is measured with the aid of the pyrometer 6.
- T calc is the corresponding discrete temperature value on the observed temperature curve .
- the control process is preceded by a setup calculation. It is the band temperature curve depending on specific process state of the material to be cooled before Inlet into the cooling section precalculated. This precalculated Belt temperature profile is used during the rolling process as operating point for the temperature control.
- Figure 2 illustrates the model calculated, i. watched Course of the belt temperature [° C] over the belt length [m].
- This first step of the control loop concerns the calculation of the strip temperature profile in the cooling section between the pyrometers 5 and 6 depending on the current set process parameters by means of a model, i. the so-called "observation”.
- the cooling curve has in the illustrated Example, a relatively large drop in the area of the first four activated cooling devices 1a, 1b, 1c, 1d, then slowly drop off.
- a specific final temperature value T meas is measured at a defined point in the strip after passing through the cooling section.
- the final temperature value is preferably the temperature of the belt just before it enters reel device 3b. It is measured by means of the reel pylon 6.
- the belt temperature at the height of the reel depends essentially depends on the material quality to be produced and moves usually in a range of 250 to 750 ° C.
- a reference temperature profile is calculated using a given reference temperature T ref , usually a desired reel temperature. This step is shown in FIG. 4.
- This course is based on the same initial value as the first calculated temperature profile, but on a different final value, ie the reference value T ref .
- Figure 5 shows schematically the units of the system for carrying out the proposed method.
- the temperature state of the strip within the cooling section is continuously monitored or calculated. If a deviation between calculated and measured reel temperature is detected, an adaptation of the model occurs, ie the calculated reel temperature is compared with the concrete measured value T meas .
- Predictor there is one unit for calculating the reference temperature profile, the so-called Predictor. This calculation takes place cyclically to the correct process within the cooling section to reach a predetermined reel temperature depending on time-dependent process disturbances like variations in tape speed, tape thickness, To ensure finishing temperature etc.
- a process monitor controller is provided which the entire system with conventional control techniques, for example, with an I-controller, if equal despite adaptation of the model still a deviation of the achieved is present from the predetermined reel temperature.
- the process monitor compensates metrologically not detectable interference and malfunctions of the overall system and thus provides one perfect product quality by comparing the reference and the currently measured reel temperature safe.
- each cooling zone by comparison with the associated reference value is individually adjustable, if the current course of the belt temperature over the belt length within the cooling section is known. This means that for Any number of discrete location coordinates within the Cooling section of the temperature condition of the band at each time point must be known. The course of the belt temperature is within the cooling section not measurable, but must be modeled calculated or observed.
- the underlying the proposed method mathematical Model for calculating the temperature curve of the strip in the cooling section is based on the following thermodynamic and aerodynamic fundamentals.
- the rolling process becomes thermodynamically a transient flow process adopted in an open system.
- the finishing street pyrometer, the hoist pyrometer and the band top and Bottom side as thermodynamic system boundaries of the cooling section is chosen, so flows on the finishing street pyrometer mass as well Energy in the form of enthalpy in the system, on the reel pylon Mass as well as energy in the form of enthalpy from the system and at the top and bottom of the band energy in the form of heat from the system.
- the Cooling section can be divided into any number of sub-processes can that the overall thermodynamic system of a Chain of sub-processes and that for each sub-process the energy and mass balance must be fulfilled.
- the mass balance for a sub-process is as follows.
- H (T) p ⁇ (T) ⁇ H ⁇ (T) + p ⁇ (T) ⁇ H ⁇ ( T )
- equations (1.8) and (1.19) result in a system of coupled differential equations.
- the substitution of, for example, difference expressions provides a network for calculating the temperature state over the length coordinate z 1 and band thickness coordinate z 2 .
- the discretization of the temperature network is carried out in the longitudinal and thickness directions with non-equidistant distances from node to node ( Figure 7).
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Control Of Metal Rolling (AREA)
- Control Of Heat Treatment Processes (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Description
- Figur 1
- eine schematische Funktions-Übersicht über das vorgeschlagene Reglungsverfahren;
- Figur 2 bis 4
- schematische Darstellungen von nacheinander ablaufenden Schritten des vorgeschlagenen Verfahrens;
- Figur 5
- eine schematische Übersicht der Systemelemente des Temperatur-Reglers;
- Figuren 6,7
- schematische Übersichten des thermodynamischen Ansatzes des Modells.
- ev
- die Dichte der extensiven Größe
- is
- den pro Zeit- und Flächeneinheit durch die Oberfläche transportierten Strom der extensiven Größe
- Γv
- die pro Zeit- und Volumeneinheit produzierte oder vernichtete Menge der extensiven Größe
- ci
- Strömungsgeschwindigkeit an der Stelle i
- s
- Stromfadenkoordinate
- z
- Höhenkoordinate der Stelle i
- pi
- Druck an der Stelle i
- Δρ
- Druckverlust durch Reibung und Einbauten
- ν
- Austrittsort des Kühlwassers aus dem Rohrsystem
- ρ
- Dichte des Fluids
- g
- Konstante.
- n =
- υ-1 Stromfadenabschnitte
- A =
- Querschnittsfläche
- Ap
- Rohrquerschnitt der Pumpe
- Vp
- durch Pumpen geförderter Volumenstrom
Claims (10)
- Verfahren zur Regelung einer Kühlstrecke, insbesondere der Kühlstrecke einer Walzstraße für Bleche und Bänder aus Stahl,
dadurch gekennzeichnet, daß der Regelkreis die folgenden zyklisch ablaufenden Schritte umfaßt :Berechnung des Bandtemperaturverlaufs in der Kühlstrecke in Abhängigkeit der aktuell eingestellten Prozeßparameter sowie des spezifischen Prozeßzustandes des Bandes,Vorausberechnung eines Referenztemperaturverlaufs unter Vorgabe einer Referenztemperatur (Tref);individuelle Regelung der Prozeßparameter der Kühlstrecke durch Vergleich des berechneten Temperaturverlaufs mit dem Referenztemperaturverlauf. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß das der Berechnung des Bandtemperaturverlaufs zugrundeliegende Modell mittels eines konkret aufgenommenen Temperaturmeßwertes (Tmeß) adaptiert wird. - Verfahren nach Anspruch 2,
dadurch gekennzeichnet, daß der konkret aufgenommene Temperaturmeßwert (Tmeß) die Temperatur des zu kühlenden Gutes kurz vor Eintritt in die Haspeleinrichtung (3b) ist. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß die Prozeßparameter der Kühlstrecke über Stellglieder von mehreren Kühleinrichtungen (1a, 1b, 1c, 1d bis 1i) einstellbar sind. - Verfahren nach Anspruch 4,
dadurch gekennzeichnet, daß obere und untere Stellglieder der Kühleinrichtungen unabhängig voneinander zur getrennten Beeinflussung der Bandober- bzw. Bandunterseite geregelt werden. - Verfahren nach Anspruch 4 oder 5,
dadurch gekennzeichnet, daß die Stellglieder der Kühleinrichtungen die Anzahl der betätigten Kühlbalken und/oder die Menge- bzw. die Geschwindigkeit des Kühlwassers umfassen. - Verfahren nach Anspuch 1,
dadurch gekennzeichnet, daß der zu erwartende Bandtemperaturverlauf in Abhängigkeit des spezifischen Prozeßzustandes des zu kühlenden Gutes vor dessen Einlauf in die Kühlstrecke vor dem eigentlichen Regelungsprozeß vorausberechnet und die entsprechenden Prozeßparameter der Kühlstrecke eingestellt werden. - System zur Durchführung des Verfahrens nach den vorherigen Ansprüchen,
das umfaßt:eine Einheit zur Berechnung des Bandtemperaturverlaufs in Abhängigkeit der aktuell eingestellten Prozeßparameter sowie des spezifischen Prozeßzustandes des Bandes,eine Einheit zur Vorausberechnung eines Referenz-Temperaturverlaufs in Abhängigkeit einer vorgegebenen Referenztemperatur (Tref),eine Vorrichtung zur Steuerung der Stellglieder der Kühleinrichtungen (1a bis 1i) der Kühlstrecke. - System nach Anspruch 8,
dadurch gekennzeichnet, daß es ein Meßgerät (6) zur Ermittlung eines konkreten Temperaturwertes (Tmeß) des Bandes (4) sowie eine Einheit zur Adaption des der Berechnung zugrundeliegenden Modells umfaßt. - System nach Anspruch 9,
dadurch gekennzeichnet, daß ein Prozeß-Monitor-Regler vorgesehen ist, der ein trotz Adaption fehlerbehaftetes Gesamtsystems abgleicht.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19850253A DE19850253A1 (de) | 1998-10-31 | 1998-10-31 | Verfahren und System zur Regelung von Kühlstrecken |
DE19850253 | 1998-10-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0997203A1 EP0997203A1 (de) | 2000-05-03 |
EP0997203B1 true EP0997203B1 (de) | 2004-02-11 |
Family
ID=7886274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99119331A Expired - Lifetime EP0997203B1 (de) | 1998-10-31 | 1999-09-29 | Verfahren und System zur Regelung von Kühlstrecken |
Country Status (6)
Country | Link |
---|---|
US (1) | US6185970B1 (de) |
EP (1) | EP0997203B1 (de) |
JP (1) | JP5059254B2 (de) |
AT (1) | ATE259262T1 (de) |
DE (2) | DE19850253A1 (de) |
ES (1) | ES2216402T3 (de) |
Cited By (3)
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EP2873469A1 (de) | 2013-11-18 | 2015-05-20 | Siemens Aktiengesellschaft | Betriebsverfahren für eine Kühlstrecke |
EP2540407B1 (de) | 2010-07-22 | 2016-01-20 | Nippon Steel & Sumitomo Metal Corporation | Stahlplattenkühlungssystem und stahlplattenkühlungsverfahren |
CN110576049A (zh) * | 2018-06-08 | 2019-12-17 | 株式会社日立制作所 | 目标温度历史生成装置、目标温度历史生成方法以及程序 |
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DE10203787A1 (de) * | 2002-01-31 | 2003-08-14 | Siemens Ag | Verfahren zur Regelung eines industriellen Prozesses |
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EP1624982B2 (de) * | 2003-02-25 | 2011-06-15 | Siemens Aktiengesellschaft | Verfahren zur regelung der temperatur eines metallbandes, insbesondere in einer fertigstrasse zum walzen von metallwarmband |
EP1596999B2 (de) † | 2003-02-25 | 2011-05-25 | Siemens Aktiengesellschaft | Verfahren zur regelung der temperatur eines metallbandes, insbesondere in einer kühlstrecke |
DE10339191A1 (de) * | 2003-08-22 | 2005-03-17 | Sms Demag Ag | Coilbox zwischen Vorstraße und Fertigstraße im Warmwalzwerk |
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EP2644718A1 (de) | 2012-03-27 | 2013-10-02 | Siemens Aktiengesellschaft | Verfahren zur Druckstabilisierung |
JP5825250B2 (ja) * | 2012-12-25 | 2015-12-02 | Jfeスチール株式会社 | 熱延鋼帯の冷却方法および冷却装置 |
EP2921239A1 (de) * | 2014-03-21 | 2015-09-23 | Siemens VAI Metals Technologies GmbH | Kühlung eines warmgewalzten Walzgutes |
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JP2020509242A (ja) | 2016-12-20 | 2020-03-26 | アルセロールミタル | 熱的に処理された鋼板を製造するための動的調整の方法 |
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JPH0929317A (ja) * | 1995-07-18 | 1997-02-04 | Nippon Steel Corp | ホットストリップミルにおける仕上温度制御方法 |
JP3300208B2 (ja) * | 1995-09-06 | 2002-07-08 | 株式会社神戸製鋼所 | プロセスラインにおける学習制御方法 |
JP3450108B2 (ja) * | 1995-12-25 | 2003-09-22 | 三菱電機株式会社 | 熱延板材の冷却制御装置 |
DE19639062A1 (de) * | 1996-09-16 | 1998-03-26 | Mannesmann Ag | Modellgestütztes Verfahren zur kontrollierten Kühlung von Warmband oder Grobblech in einem rechnergeführten Walz- und Kühlprozeß |
-
1998
- 1998-10-31 DE DE19850253A patent/DE19850253A1/de not_active Withdrawn
-
1999
- 1999-09-29 AT AT99119331T patent/ATE259262T1/de active
- 1999-09-29 ES ES99119331T patent/ES2216402T3/es not_active Expired - Lifetime
- 1999-09-29 EP EP99119331A patent/EP0997203B1/de not_active Expired - Lifetime
- 1999-09-29 DE DE59908504T patent/DE59908504D1/de not_active Expired - Lifetime
- 1999-10-29 JP JP30953599A patent/JP5059254B2/ja not_active Expired - Lifetime
- 1999-11-01 US US09/431,458 patent/US6185970B1/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2540407B1 (de) | 2010-07-22 | 2016-01-20 | Nippon Steel & Sumitomo Metal Corporation | Stahlplattenkühlungssystem und stahlplattenkühlungsverfahren |
EP2873469A1 (de) | 2013-11-18 | 2015-05-20 | Siemens Aktiengesellschaft | Betriebsverfahren für eine Kühlstrecke |
WO2015071200A1 (de) | 2013-11-18 | 2015-05-21 | Siemens Aktiengesellschaft | Betriebsverfahren für eine kühlstrecke |
CN110576049A (zh) * | 2018-06-08 | 2019-12-17 | 株式会社日立制作所 | 目标温度历史生成装置、目标温度历史生成方法以及程序 |
CN110576049B (zh) * | 2018-06-08 | 2021-03-05 | 株式会社日立制作所 | 目标温度历史生成装置、目标温度历史生成方法以及记录装置 |
Also Published As
Publication number | Publication date |
---|---|
JP5059254B2 (ja) | 2012-10-24 |
DE59908504D1 (de) | 2004-03-18 |
ATE259262T1 (de) | 2004-02-15 |
ES2216402T3 (es) | 2004-10-16 |
EP0997203A1 (de) | 2000-05-03 |
JP2000135507A (ja) | 2000-05-16 |
US6185970B1 (en) | 2001-02-13 |
DE19850253A1 (de) | 2000-05-04 |
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