Electrostatic Filtration Performance of Conductive Fibrous Filters

Experiments were performed to improve the filtration efficiency of conductive fibrous filters by applying electrostatic charges. Ordinary polyester staple fiber and organic conductive fiber were blended in 90/10, 80/20, 70/30, and 60/40 ratios. Quantitative conductive needle felts were prepared by needle punching. The conductive fibrous filters were applied to a dc voltage supply (from 0 to 6 kV), and the relationship between filtration efficiency and the high voltage applied was studied. The results suggested that there was an approximately linear relationship between the filtration efficiency and the applied voltage value. The conductivity of filter material increased with increased blending ratio of the conductive fibers, basis weight, and thickness.