US 12,324,456 B2
Hydro-entangled filter material for smoking products
Dietmar Volgger, Gnadenwald (AT); and Stefan Bachmann, Fulpmes (AT)
Assigned to DELFORTGROUP AG, Traun (AT)
Appl. No. 17/782,506
Filed by DELFORTGROUP AG, Traun (AT)
PCT Filed Dec. 13, 2019, PCT No. PCT/EP2019/085125
§ 371(c)(1), (2) Date Jun. 3, 2022,
PCT Pub. No. WO2021/115619, PCT Pub. Date Jun. 17, 2021.
Prior Publication US 2023/0016316 A1, Jan. 19, 2023
Int. Cl. A24D 3/10 (2006.01); A24D 3/02 (2006.01); A24D 3/04 (2006.01); A24D 3/06 (2006.01); A24D 3/14 (2006.01); A24D 3/17 (2020.01); D04H 1/26 (2012.01); D04H 1/28 (2012.01); D04H 1/4258 (2012.01); D04H 1/492 (2012.01)
CPC A24D 3/10 (2013.01) [A24D 3/0245 (2013.01); A24D 3/04 (2013.01); A24D 3/068 (2013.01); A24D 3/14 (2013.01); A24D 3/17 (2020.01); D04H 1/26 (2013.01); D04H 1/28 (2013.01); D04H 1/4258 (2013.01); D04H 1/492 (2013.01)] 39 Claims
 
1. Filter material for a smoking article, which comprises a nonwoven, characterized in that
the nonwoven is hydro-entangled,
the hydro-entangled nonwoven contains at least 50% and at most 90% wood pulp fibers, at least 10% and at most 50% fibers from regenerated cellulose and less than 30% non-natural polymers, respectively with respect to the mass of the hydro-entangled nonwoven, and the amount of wood pulp fibers and fibers from regenerated cellulose together makes up at least 70% of the mass of the hydro-entangled nonwoven, and
the hydro-entangled nonwoven has a density of at least 100 kg/m3 and at most 300 kg/m3 and a thickness of at least 100 μm and at most 1000 μm, wherein the thickness is measured in accordance with ISO 534:2011 and the density of the hydro-entangled nonwoven is determined by dividing the basis weight in accordance with ISO 536:2012 by the thickness in accordance with ISO 534:2011, wherein the wood pulp fibers are at least partially bleached.