Abstract
Conventional electret polypropylene nonwoven fabrics were made by corona discharging method. The both outer surfaces of the nonwoven fabrics had a lot of charge, but the inner parts of the nonwoven fabrics had poorer charge than both outer surfaces. Therefore, this paper reported the streaming electrification which was to make insulation liquid stream through the polypropylene nonwoven fabric. It was found that the both of outer surfaces and inner parts of the nonwoven fabric were uniformly charged, and also the polarization with positive and negative was confirmed by observation of dust figures. The performance of the filtration was superior to the conventional electret nonwoven fabric.
