Patent ID: 8333918
Filing Date: 2012-12-18
Classification: D01D,D04H

Abstract:
1. A method of making a nonwoven web, the method comprising: a) providing a plurality of fibers; b) subjecting the fibers to a pneumatic attenuation force in a drawing slot, the attenuation force imparting a velocity to the fibers; c) reducing the velocity of the fibers in a diffusion chamber that is spaced from an exit of the drawing slot in a direction of travel of the plurality of fibers, the diffusion chamber being formed substantially between opposed diverging sidewalls; d) subjecting the fibers to an applied electrostatic charge before the fibers enter the diffusion chamber, wherein the electrostatic charge is applied by two or more oppositely directed electrostatic charging units with each charging unit including an emitter device and a target device such that at least one emitter device is configured on each side of the fibers so that an electrostatic charge is generated from opposite directions transverse to the direction of travel of the plurality of fibers; and thereafter e) collecting the fibers into a web on a moving forming surface.