US 12,442,137 B2
Heat-resistant wrapper paper for aerosol-generating articles
Roland Zitturi, Innsbruck (AT); and Dietmar Volgger, Gnadenwald (AT)
Assigned to DELFORTGROUP AG, Traun (AT)
Appl. No. 18/012,571
Filed by DELFORTGROUP AG, Traun (AT)
PCT Filed May 18, 2021, PCT No. PCT/EP2021/063133
§ 371(c)(1), (2) Date Dec. 22, 2022,
PCT Pub. No. WO2022/002477, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 10 2020 117 368.7 (DE), filed on Jul. 1, 2020.
Prior Publication US 2023/0250590 A1, Aug. 10, 2023
Int. Cl. D21H 21/34 (2006.01); A24D 1/02 (2006.01); A24D 1/20 (2020.01); D21H 17/00 (2006.01); D21H 17/28 (2006.01); D21H 17/66 (2006.01); D21H 17/67 (2006.01); D21H 19/10 (2006.01)
CPC D21H 21/34 (2013.01) [A24D 1/02 (2013.01); A24D 1/20 (2020.01); D21H 17/28 (2013.01); D21H 17/66 (2013.01); D21H 17/675 (2013.01); D21H 17/74 (2013.01); D21H 19/10 (2013.01)] 22 Claims
 
1. Aerosol-generating article which comprises a wrapper paper and an aerosol-generating material, wherein the aerosol-generating article is configured to be heated, but not burnt, wherein the wrapper paper wraps the aerosol-generating material, wherein the wrapper paper comprises pulp fibers and a char-former, wherein the pulp fibers make up at least 70% and at most 95% of the mass of the wrapper paper, wherein the char-former is at least substantially uniformly distributed over at least 70% of the surface area of the wrapper paper and the char-former is contained in a concentration of at least 5% and at most 20% with respect to the mass of the wrapper paper and is present in a concentration in the wrapper paper such that the quotient r=RT/Ro of the tensile strength Ro, measured in accordance with ISO 1924-2:2008 under the conditions of ISO 187:1990, and of the tensile strength RT, measured in accordance with ISO 1924-2:2008 under the conditions of ISO 187:1990 after the wrapper paper has been exposed to a temperature of 230° C. for one minute, is at least 0.20 and at most 0.90, and
wherein the proportion of said char-former is higher on one side of the wrapper paper than on the other side and the side with the higher proportion of char-former faces the aerosol-generating material.