INFLUENCE OF HIGH VOLTAGE WAVEFORM AND FREQUENCY ON THE ELIMINATION OF ELECTRIC CHARGES AT THE SURFACE OF POLYPROPYLENE FILMS
Keywords:
Ac corona discharge, Polypropylene films, Electrostatic charge elimination, Surface electric potentialAbstract
One of the primary sources of fires and explosions in manufacturing processes is the build-up of electric charge during the manipulation of insulating materials. The challenge is to find an appropriate method to eliminate these charges. This present work aims to evaluate the influence of the frequency and the waveform of the high voltage on the efficiency of charge neutralization of electrically charged polypropylene films using a triode-type corona electrode configuration. A positive polarity DC high-voltage power supply was employed for the corona charging of the samples, which were then neutralized using the triode-type electrode system energized from a sinusoidal-, a triangular- or a square-wave AC high-voltage supply. The electric charge state of the PP film was characterized by means of a non-contact electrostatic voltmeter for measuring the electric potential along the central axis of the sample. The neutralization rate increased with the frequency for both sinusoidal and triangular AC high voltages. At all frequencies, the square-wave high-voltage was more efficient than the others. At 50 Hz, the surface charge was eliminated after several successive exposures of the samples to the discharge generated from the triode-type corona electrode connected to a sinusoidal HV supply.
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