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In order to save energy at the time of dust collection, the authors have tried to provide as much charge as possible to electret filter. Polypropylene (PP) (nonwoven, by melt-blowing) and polytetrafluoroethylene (PTFE) (layering of PTFE fibers in wet system and heat dried) were used as a sample. High voltage DC corona, pulse corona and pulse with DC corona were applied to the sample materials. The...
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