Charging method for meltblown webs
AssigneeExxon Chemical Patents Inc.
InventorWilliam E. Deeds
Life of this patent
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Abstract
Electrically charged meltblown webs are formed by convergingly discharging electrically charged hot air onto a row of extruded polymer fibers to contact the fibers thereby (i) attenuating and stretching the fibers and (ii) imparting an electric charge to the fibers. The fibers may be continuous or discontinuous.
Claims6
In a meltblowing process wherein a molten thermo-plastic resin is extruded through a plurality of orifices of a meltblowing die to form a plurality of fibers, and wherein hot air streams are blown into contact with the extruded fibers at such an angle to stretch and attenuate the fibers, the improvement comprising:
- (a) electrically charging the hot air streams prior to contacting the extruded fibers;
- and
- (b) thereafter causing the hot air streams to contact the extruded fibers and impart an electrical charge to the fibers.
Dependencies are inferred from the claim text.