DE19847258A1 - Method and device for detecting state of electrostatic coating such as oil layer on cold rolled strips by detecting reflected laser light from particles in spray mist and evaluating using image processing - Google Patents
Method and device for detecting state of electrostatic coating such as oil layer on cold rolled strips by detecting reflected laser light from particles in spray mist and evaluating using image processingInfo
- Publication number
- DE19847258A1 DE19847258A1 DE19847258A DE19847258A DE19847258A1 DE 19847258 A1 DE19847258 A1 DE 19847258A1 DE 19847258 A DE19847258 A DE 19847258A DE 19847258 A DE19847258 A DE 19847258A DE 19847258 A1 DE19847258 A1 DE 19847258A1
- Authority
- DE
- Germany
- Prior art keywords
- spray
- reflection
- laser light
- spray mist
- image processing
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/082—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to a condition of the discharged jet or spray, e.g. to jet shape, spray pattern or droplet size
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
- B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
- B05B5/084—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects the objects lying on, or being supported above conveying means, e.g. conveyor belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0266—Measuring or controlling thickness of liquid films
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Spray Control Apparatus (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Zustandserfassung von Beschichtungsmitteln beim elektrostatischen Beschichten von Gegenständen, beispielsweise kaltgewalzter Bänder, bei dem das Beschichtungsmittel in annähernd gleichmäßiger Schichtdicke aufgetragen und der Auftrag aus einem verdüste Sprühteilchen enthaltenen Sprühnebel vorgenommenen wird, wobei mit der Temperatur des Beschichtungsmittels, der angelegten Spannung und der Volumenstrommenge die Schichtdicke eingestellt wird.The invention relates to a method for state detection of coating agents in electrostatic coating of objects, for example cold rolled strips which the coating agent in approximately uniform Layer thickness applied and the application from an atomized Spray mist containing spray particles is made, with the temperature of the coating agent, the applied voltage and the volume flow rate Layer thickness is set.
Die Erfindung betrifft ferner eine Vorrichtung zur Zustandserfassung von Beschichtungsmitteln beim elektrostatischen Beschichten von Gegenständen mit einem Sprühsystem, das das Beschichtungsmittel aus einem Sprühnebel auf den Gegenstand elektrostatisch aufbringt.The invention further relates to a device for Condition detection of coating agents at electrostatic coating of objects with a Spray system that removes the coating agent from a spray applies electrostatically to the object.
Es ist bekannt, kaltgewalzte Bleche und Bänder mit einer dünnen Ölschicht zu versehen. Die Ölschicht wird üblicherweise mittels eines elektrostatischen Sprühsystems aufgebracht wie es beispielsweise in der US 5 441 204 beschrieben ist. Der hierin offenbarte Sprühbalken trägt mehrere nebeneinander liegende Düsen, die das Öl in einem über die Breite des Bandes sich erstreckenden Sprühkegel vernebeln.It is known to use cold rolled sheet and strip to provide a thin layer of oil. The oil layer will usually using an electrostatic spray system applied as is the case, for example, in US Pat. No. 5,441,204 is described. The spray bar disclosed herein carries several juxtaposed nozzles that the oil in one spray cone extending across the width of the belt fog up.
Die Gleichmäßigkeit des Auftrages der Ölteilchen auf das sich vorbeibewegende Band hängt somit entscheidend von deren Verteilung und Menge im Sprühkegel ab. Inhomogenitäten in der Verteilung der Ölteilchen führen zu unterschiedlichen Abscheideraten auf dem Substrat und damit zu einem ungleichmäßigem Ölfilm. Sie haben ihre Ursache häufig in der Verschmutzung der Sprühdüsen, in Unterschieden der Ölzusammensetzung und des Potentialverlaufs.The uniformity of the application of the oil particles on the itself moving band depends crucially on their Distribution and quantity in the spray cone. Inhomogeneities in the Distribution of the oil particles lead to different Deposition rates on the substrate and thus to one uneven oil film. They often have their cause in the Pollution of the spray nozzles, in the differences of the Oil composition and the potential course.
Bei diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung der eingangs genannten Art bereitzustellen, daß die Gleichmäßigkeit des Beschichtungsauftrages erhöht und die Wartungs- und Instandhaltung der Beschichtungsanlage verbessert. In this prior art, the object of the invention based on a method and a device of the introduction provide mentioned type that the uniformity of the Coating order increased and the maintenance and Maintenance of the coating system improved.
Diese Aufgabe wird durch ein Verfahren der eingangs genannten Gattung mit den kennzeichnenden Merkmalen des Anspruches 1 und durch eine Vorrichtung mit den kennzeichnenden Merkmalen des Anspruches 5 gelöst.This task is accomplished by a method of the type mentioned at the beginning Genus with the characterizing features of claim 1 and by a device with the characteristic features of claim 5 solved.
Vorteilhafte Ausgestaltungen des Verfahrens und der Vorrichtung sind den Unteransprüchen entnehmbar.Advantageous embodiments of the method and Device can be found in the subclaims.
Das erfindungsgemäße Verfahren ermöglicht es, die Existenz, Homogenität und Verteilung der Sprühteilchen im Sprühnebel als ein Maß für den Betriebszustand des Sprühsystems zu bestimmen.The method according to the invention enables the existence, Homogeneity and distribution of the spray particles in the spray as a measure of the operating state of the spray system determine.
Die erfindungsgemäße Vorrichtung zur Durchführung des Verfahrens hat den Vorteil eines kompakten und robusten Aufbaus bei gleichzeitiger einfacherer Bedienbarkeit.The inventive device for performing the The process has the advantage of being compact and robust Construction with easier usability at the same time.
Mit all diesen Merkmalen wird erreicht, daß die erfindungsgemäße Lösung den komplexen Anforderungen einer gleichmäßigen Beschichtung von Gegenständen, beispielsweise Blechen und/oder Bänder mit hoher Effizienz und Konstanz besser gerecht wird.With all these features it is achieved that the Solution according to the invention the complex requirements of a uniform coating of objects, for example Sheets and / or strips with high efficiency and consistency does better justice.
Weitere Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung unter Bezugnahme auf die beigefügten Zeichnungen.Further advantages and details emerge from the following description with reference to the attached drawings.
Die Erfindung soll nachstehend an einem Ausführungsbeispiel näher erläutert werden. The invention is intended to be based on an exemplary embodiment are explained in more detail.
Es zeigen:Show it:
Fig. 1 eine schematische Darstellung der erfindungsgemäßen Vorrichtung, Fig. 1 is a schematic representation of the device according to the invention,
Fig. 2 ein Ablaufschema des erfindungsgemäßen Verfahrens und Fig. 2 is a flow diagram of the method according to the invention and
Fig. 3 Beispiele einer Reflexionsspur des Laserstrahles im Sprühnebel. Fig. 3 examples of a reflection trace of the laser beam in the spray.
Fig. 1 zeigt schematisch ein Band 1, dessen Ober- und Unterseite durch ein elektrostatisches Sprühsystem 2 mit Öl zu beschichten ist. Der Sprühbalken 3 trägt nicht dargestellte Düsen, die das Öl als Sprühnebel in Form eines keilförmig ausgebildeten Sprühnebelraumes 4 über die Breite B des Bandes zerstäuben. An einer Stirnseite S des Sprühnebelraumes 4 befindet sich eine Laserlichtquelle 5 eines Rotlicht-Lasers, die einen Laserstrahl 6 erzeugt, welcher den mit Sprühteilchen gefüllten Sprühnebelraum 4 durchsetzt. Der Laserstrahl 6 tritt senkrecht in den Sprühnebelraum 4 ein und ist so ausgerichtet, daß er nahe der Düsen etwa parallel zur Ober- und/oder Unterseite des zu beschichtenden Bandes 1 von einer Stirnseite zur anderen Stirnseite verläuft. Bei seinem Weg durch den Ölnebel trifft der Laserstrahl 6 auf Sprühteilchen, die das auftreffende Licht reflektieren. Es entsteht im Sprühnebelraum 4 eine sichtbare Reflexionsspur 7. Fig. 1 shows schematically a tape 1 , the top and bottom of which is to be coated with oil by an electrostatic spray system 2 . The spray bar 3 carries nozzles, not shown, which atomize the oil as a spray in the form of a wedge-shaped spray space 4 across the width B of the belt. Is located at a front side S of the spray chamber 4 a laser light source 5 of a red-light laser, which generates a laser beam 6, which passes through the spray chamber is filled with spray particles. 4 The laser beam 6 enters the spray mist chamber 4 vertically and is oriented such that it runs approximately parallel to the top and / or bottom of the strip 1 to be coated from one end face to the other end face near the nozzles. As it travels through the oil mist, the laser beam 6 strikes spray particles that reflect the incident light. A visible reflection trace 7 is created in the spray space 4 .
Die Fig. 2 zeigt eine derartig im Ölnebel sichtbar gemachte Reflexionsspur 7. Diese Reflexionsspur 7 wird mit einer CCD- Kamera 8, die etwa senkrecht zur Keilfläche K des Sprühnebelraumes 4 positioniert ist, abgebildet und die Bilddaten digital gespeichert. Fig. 2 shows a such visualized in the oil mist reflection lane 7. This reflection track 7 is imaged with a CCD camera 8 , which is positioned approximately perpendicular to the wedge surface K of the spray mist space 4 , and the image data is stored digitally.
Die gespeicherten Daten werden wie aus dem Ablaufschema gemäß Fig. 3 dargestellt in einer Bildverarbeitungseinheit 9 verarbeitet. Die Bildverarbeitungseinheit 9 besteht aus einem Prozessor 10, der mit der CCD-Kamera 8 verbunden ist, und aus einem Monitor 12, auf dem die Reflexionsspur 7 zugleich analog für den Anlagenbediener angezeigt wird.The stored data are processed in an image processing unit 9 as shown in the flowchart according to FIG. 3. The image processing unit 9 consists of a processor 10 , which is connected to the CCD camera 8 , and a monitor 12 , on which the reflection track 7 is simultaneously displayed analogously for the system operator.
Das erfaßte Bild der sichtbaren Reflexionsspur 7 wird dahingehend untersucht, ob die Reflexionsspur linienförmig geschlossen ist und keine Unterbrechungen aufweist. Treten Unterbrechungen in der Reflexionsspur 7 auf, bedeutet dies, daß in dem vom Laserlichtstrahl 6 durchsetzten Sprühnebelraum 4 Inhomogenitäten in der Verteilung der Sprühteilchen vorhanden sind.The captured image of the visible reflection track 7 is examined to determine whether the reflection track is closed in a line and has no interruptions. Occur discontinuities in the reflection on lane 7, this means that in the penetrated by the laser light beam 6 spray chamber 4 inhomogeneities are present in the distribution of the spray particles.
Die im Prozessor gespeicherte Erkennungssoftware klassifiziert den Zustand des Sprühnebels im Sprühnebelraum 4 in einen für den Beschichtungsprozeß "guten" oder "schlechten" Zustand. Für den Fall, daß die Erkennungssoftware aus dem unterbrochenen Verlauf der Reflexionsspur 7 Inhomogenitäten im Sprühnebel feststellt, wird eine Signaleinheit 11 angesteuert, die ein Signal für die Änderung der Regelgrößen Temperatur, Spannung und Volumenstrommenge an den Anlagenfahrer ausgibt. The recognition software stored in the processor classifies the state of the spray in the spray space 4 into a "good" or "bad" state for the coating process. In the event that the detection software detects inhomogeneities in the spray from the interrupted course of the reflection track 7 , a signal unit 11 is activated which outputs a signal for the change in the controlled variables temperature, voltage and volume flow rate to the plant operator.
11
Band
tape
22nd
Sprühsystem
Spray system
33rd
Sprühbalken
Spray bar
44th
Sprühnebelraum
Spray mist
55
Laserlichtquelle
Laser light source
66
Laserlichtstrahl
Laser light beam
77
Reflexionsspur
Reflection trail
88th
CCd-Kamera
CCd camera
99
Bildverarbeitungseinheit
Image processing unit
1010th
Prozessor
processor
1111
Signaleinheit
Signal unit
1212th
Monitor
B Breite des Bandes
S Stirnseite von monitor
B Width of the band
S face of
44th
K Keilfläche von K wedge area of
44th
Claims (11)
- a) die im Sprühnebel enthaltenen Sprühteilchen werden mit einer Laserlichtquelle beaufschlagt, zur Reflexion angeregt und als Reflexionsspur sichtbar gemacht;
- b) die sichtbare Reflexionsspur wird opto-elektronisch überwacht und digital aufgezeichnet;
- c) die Aufzeichnung nach Schritt b) wird einer rechnergestützten Bildverarbeitung unterworfen, die die aufgezeichnete Reflexionsspur nach Existenz, Verteilung/Homogenität der Sprühteilchen im Sprühnebel auswertet und der Bereich gemäß Schritt a) in "gut" oder "schlecht" klassifiziert und
- d) mit der Klassifizierung nach Schritt c) wird ein Signal für die Nachregelung und/oder Veränderung der Steuergrößen Temperatur, Spannung und Volumenstrommenge ausgelöst.
- a) the spray particles contained in the spray are acted upon by a laser light source, stimulated to reflect and made visible as a reflection trace;
- b) the visible reflection trace is monitored opto-electronically and recorded digitally;
- c) the recording after step b) is subjected to computer-aided image processing, which evaluates the recorded reflection trace for existence, distribution / homogeneity of the spray particles in the spray and classifies the area according to step a) into "good" or "bad" and
- d) with the classification according to step c), a signal for the readjustment and / or change of the control variables temperature, voltage and volume flow rate is triggered.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19847258A DE19847258B4 (en) | 1998-10-02 | 1998-10-02 | Method and apparatus for condition detection of coating compositions in the electrostatic coating of objects |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19847258A DE19847258B4 (en) | 1998-10-02 | 1998-10-02 | Method and apparatus for condition detection of coating compositions in the electrostatic coating of objects |
Publications (2)
Publication Number | Publication Date |
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DE19847258A1 true DE19847258A1 (en) | 2000-04-06 |
DE19847258B4 DE19847258B4 (en) | 2008-09-04 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE19847258A Expired - Fee Related DE19847258B4 (en) | 1998-10-02 | 1998-10-02 | Method and apparatus for condition detection of coating compositions in the electrostatic coating of objects |
Country Status (1)
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DE (1) | DE19847258B4 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003084668A2 (en) * | 2002-04-05 | 2003-10-16 | Gennady Mikhailovich Chernykh | Method for oiling a strip with the aid of device for electrostatic oiling |
DE102004011169A1 (en) * | 2004-03-08 | 2005-09-29 | Sonplas Gmbh | To establish pattern of fluid stream, e.g. from fuel injection valve for IC motor, laser beam is aligned at right angles to stream and shifted within it for receiver to register light intensities after passing through stream |
WO2013041184A1 (en) * | 2011-09-23 | 2013-03-28 | Dürr Systems GmbH | Coating method and coating device with a compensation for asymmetries of the spray jet |
GB2507069A (en) * | 2012-10-17 | 2014-04-23 | Siemens Plc | Monitoring the quality of an electrostatic coating by measuring light reflected from a spray |
DE102018126837A1 (en) | 2018-10-26 | 2020-04-30 | Emg Automation Gmbh | Process for the automated control and regulation of a machine for applying lubricant and device for the automated control and regulation of a machine for applying lubricant |
DE102020205573B3 (en) * | 2020-05-04 | 2021-05-12 | Thyssenkrupp Steel Europe Ag | Method for electrostatic wetting of a metal flat product and electrostatic wetting device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102015111889B4 (en) | 2015-07-22 | 2020-02-27 | Andreas Reichhardt | Procedure for testing an agricultural sprayer |
DE102017103007A1 (en) | 2017-02-15 | 2018-08-16 | Eisenmann Se | Method and paint system for painting a workpiece with an atomizer |
DE102018125205B4 (en) * | 2018-10-11 | 2021-09-23 | Aom Systems Gmbh | Method and device for determining the degree of wear of a spray nozzle |
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DE4427659A1 (en) * | 1994-08-04 | 1996-02-08 | Tseng Lin Chin | Computer supported paint application process |
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DE4427659A1 (en) * | 1994-08-04 | 1996-02-08 | Tseng Lin Chin | Computer supported paint application process |
Non-Patent Citations (2)
Title |
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EICHLER,Jürgen, EICHLER,Hans-Joachim: Laser, Grundlagen, Systeme, Anwendungen, Springer-Verlag,Berlin, u.a., 1990, S.367-374 * |
FLEIG,G.: Elektrostatisches Lackieren mit Hand- und Automatikanlagen. In: I-Lack 4/87, 55.Jg., S.117-121 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003084668A2 (en) * | 2002-04-05 | 2003-10-16 | Gennady Mikhailovich Chernykh | Method for oiling a strip with the aid of device for electrostatic oiling |
WO2003084668A3 (en) * | 2002-04-05 | 2004-01-22 | Gennady Mikhailovich Chernykh | Method for oiling a strip with the aid of device for electrostatic oiling |
DE102004011169A1 (en) * | 2004-03-08 | 2005-09-29 | Sonplas Gmbh | To establish pattern of fluid stream, e.g. from fuel injection valve for IC motor, laser beam is aligned at right angles to stream and shifted within it for receiver to register light intensities after passing through stream |
DE102004011169B4 (en) * | 2004-03-08 | 2009-11-12 | Sonplas Gmbh | Method and device for detecting a jet pattern of a fluid jet |
WO2013041184A1 (en) * | 2011-09-23 | 2013-03-28 | Dürr Systems GmbH | Coating method and coating device with a compensation for asymmetries of the spray jet |
CN103826755A (en) * | 2011-09-23 | 2014-05-28 | 杜尔系统有限责任公司 | Coating method and coating device with a compensation for asymmetries of the spray jet |
US11311903B2 (en) | 2011-09-23 | 2022-04-26 | Dürr Systems Ag | Coating method and coating device with compensation for asymmetries of the spray jet |
GB2507069A (en) * | 2012-10-17 | 2014-04-23 | Siemens Plc | Monitoring the quality of an electrostatic coating by measuring light reflected from a spray |
DE102018126837A1 (en) | 2018-10-26 | 2020-04-30 | Emg Automation Gmbh | Process for the automated control and regulation of a machine for applying lubricant and device for the automated control and regulation of a machine for applying lubricant |
WO2020083540A1 (en) | 2018-10-26 | 2020-04-30 | Emg Automation Gmbh | Method for the automated open-loop and closed-loop control of a machine for lubricant application and device for the automated open-loop and closed-loop control of a machine for lubricant application |
CN113164999A (en) * | 2018-10-26 | 2021-07-23 | Emg自动化有限公司 | Method for automatically controlling a machine for applying lubricant and device for automatically controlling a machine for applying lubricant |
DE102020205573B3 (en) * | 2020-05-04 | 2021-05-12 | Thyssenkrupp Steel Europe Ag | Method for electrostatic wetting of a metal flat product and electrostatic wetting device |
Also Published As
Publication number | Publication date |
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DE19847258B4 (en) | 2008-09-04 |
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