Tribocharging of PP Granules after exposure to a Dielectric Barrier Discharge (DBD). Effect of Exposure Duration, Voltage Amplitude and Frequency
Résumé
Triboelectric charging is used for many applications including electrostatic separation of granular insulating materials. For this application, the granules should get the highest electric charge, so that the electric field forces could easily separate them. Triboelectric charging is a surface phenomenon and dielectric barrier discharge (DBD) is known for its ability to change surface properties of different materials. This study is focused on the evaluation of the DBD factors that might enhance the triboelectric charging properties of Polypropylene (PP) mm-size granules: the discharge duration, as well as the frequency and the amplitude of the high-voltage. After having been exposed to the DBD, the granules were tribocharged in a vibratory device for 5 min. Then, the charge was measured by a Faraday pail connected to an electrostatic voltmeter. The results show that under optimal operating conditions, DBD exposure can enhance the triboelectric charging by about 30%.
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