Spunbond cigarette filter
AssigneeSchweitzer-Mauduit International, Inc.
InventorsEdward P. Bullwinkel, Leon E. Chambers, Jr., Robert G. Geer
Life of this patent
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Abstract
A filter made from a nonwoven spunbond web comprising a plurality of continuous intertwined filaments, each filament having a diameter of about 25 to about 100 microns, predominantly present in the web as loop springs having diameters of about 1 to 3 millimeters. The web is made from a plurality of spunbond filaments laid randomly onto a moving belt. The webs of the present invention find particular utility when formed into cylinders as filters for smoking articles. In the smoking articles, the filters of the invention have a desirable degree of firmness while demonstrating an acceptable pressure drop.
Claims16
A filter for a smoking article, said filter comprising a cylinder adapted to fit the smoking article and formed from an unbonded nonwoven web of continuous intertwined spunbond filaments, each having a diameter of about 25 to about 100 microns, the plurality of filaments randomly deposited to define a plurality of intertwined loop springs, each loop spring having a diameter of about 0.5 to 3 millimeters, so that the filter element has a pressure drop of 1 to about 4.5 cm water/cm filter and a firmness value from about 0.3 to 0.8 millimeter deflection.
A filter for a smoking article, said filter comprising a cylinder adapted to fit the smoking article and formed from an unbonded nonwoven web of continuous intertwined spunbond filaments formed from a thermoplastic polymer selected from polyolefins and polyesters, each filament having a diameter of about 25 to about 100 microns, the filaments defining a plurality of intertwined loop springs, each loop spring having a diameter of about 0.5 to 3 millimeters, so that the filter element has a pressure drop of 1 to about 4.5 cm water/cm filter and a firmness value from about 0.3 to 0.8 millimeter deflection.
Dependencies are inferred from the claim text.