초록 ▼

The disclosed method provides an electret filter having a permanent electrostatic charge and formed of polymer fibers having an intrinsic viscosity of 1.5 or less. Fibers of the requisite viscosity are formed into a non-woven fabric and fed, at room temperature, through a gap between a discharge ele

The disclosed method provides an electret filter having a permanent electrostatic charge and formed of polymer fibers having an intrinsic viscosity of 1.5 or less. Fibers of the requisite viscosity are formed into a non-woven fabric and fed, at room temperature, through a gap between a discharge electrode and a ground electrode while being tightly pressed against the ground electrode. The ground electrode preferrably presents a polished metal surface for contact with the web.

대표청구항 ▼

A method of manufacturing electret filters comprising: providing a preformed non-woven fabric of non-polar synthetic polymer fibers having an intrinsic viscosity of 1.5 or less; providing a ground electrode and at least one discharge electrode adjacent said ground electrode and establishing a high v

A method of manufacturing electret filters comprising: providing a preformed non-woven fabric of non-polar synthetic polymer fibers having an intrinsic viscosity of 1.5 or less; providing a ground electrode and at least one discharge electrode adjacent said ground electrode and establishing a high voltage field therebetween; passing said preformed non-woven fiber fabric through the high voltage field while in contact with the ground electrode to impart a permanent electrostatic charge to said fabric, said fabric remaining at approximately room temperature as it passes through the high voltage field.