Electrostatic electret

Melt blown electrostatic electret process, One of the important factors for the melt blown fabric to meet the standard is to add tourmaline, silica, zirconium phosphate and other inorganic materials into PP polypropylene polymer in advance, and then charge the melt blown material by one or more groups of corona discharge with the electrode voltage of 35-50kv of electrostatic generator before rolling cloth. When high voltage is applied, the air around the molybdenum wire will be ionized and local area will be produced in the process of partial breakdown discharge, the carriers are depos-

ited on the surface of melt blown fabric by the action of electric field. Some carriers will go deep into the surface layer and be trapped by the electret masterbatch, which makes the meltblown cloth become electret filter material. The melt blown nonwovens treated by electrostatic electret have the advantages of high filtration efficiency and low filtration resistance because they have persistent static electricity and can capture fine dust by electrostatic effect.