High Strength Wrapping Material Containing Extracted Tobacco
A wrapping material for an aerosol producing product is disclosed that contains extracted tobacco material combined with strength building fibers. The strength building fibers are refined and optionally bleached bast fibers. In one aspect, the bast fibers can be hemp fibers. The wrapping material can contain the extracted tobacco material in amounts greater than 40 % by weight.
1 . A wrapping material for an aerosol producing filler comprising:
a web comprising at least about 40% by weight of an extracted tobacco material, the extracted tobacco material being blended with strength building fibers, the strength building fibers comprising refined bast fibers, the refined bast fibers having an average fiber length of less than about 4 mm, the wrapping material having a basis weight of from about 15 gsm to about 45 gsm.
2 . A wrapping material as defined in claim 1 , wherein the web contains the extracted tobacco material in an amount greater than about 50% by weight.
3 . A wrapping material as defined in claim 1 , wherein the web has a tensile strength of greater than about 2,100 cN/30 mm when tested according to ASTM Test D828-97.
4 . A wrapping material as defined in claim 1 , wherein the refined bast fibers are present in the web in an amount greater than about 10% by weight.
5 . A wrapping material as defined in claim 1 , wherein the refined bast fibers comprise refined hemp fibers.
6 . A wrapping material as defined in claim 1 , wherein the wrapping material further contains wood pulp fiber in an amount up to about 10% by weight.
7 . A wrapping material as defined in claim 1 , wherein the refined bast fibers have been bleached.
8 . A wrapping material as defined in claim 1 , wherein the extracted tobacco material has been refined but has not been pulped.
9 . A wrapping material as defined in claim 1 , wherein the extracted tobacco material contains water soluble components in an amount less than about 20% by weight.
10 . A wrapping material as defined in claim 1 , wherein the wrapping material has a basis weight of from about 25 gsm to about 38 gsm.
11 . A wrapping material as defined in claim 1 , wherein the wrapping material has a stretch of greater than about 1%.
12 . A wrapping material as defined in claim 1 , wherein the wrapping material has a permeability of from about 5 Coresta to about 80 Coresta.
13 . A wrapping material as defined in claim 1 , wherein the web further contains filler particles in an amount from about 0.5% to about 30% by weight.
14 . A wrapping material as defined in claim 1 , wherein the web contains no filler particles.
15 . A wrapping material as defined in claim 1 , wherein the wrapping material has been treated with a burn control agent.
16 . A wrapping material as defined in claim 15 , wherein the burn control agent comprises a salt of a carboxylic acid, the burn control agent being present in the web in an amount from about 0.3% by weight to about 3% by weight.
17 . A wrapping material as defined in claim 1 , wherein the wrapping material has been treated with a gum.
18 . A wrapping material as defined in claim 17 , wherein the gum comprises guar gum, an alginate, carboxymethyl cellulose, or mixtures thereof.
19 . A wrapping material as defined in claim 1 , wherein the wrapping material has a diffusivity of less than about 0.5 cm/s at 23° C.
20 . A wrapping material as defined in claim 19 , wherein the wrapping material includes a plurality of reduced ignition areas that have been formed by applying a reduced ignition composition to the web.
21 . An aerosol generating product comprising:
a cylindrical rod comprising an aerosol producing filler surrounded by the wrapping material of claim 1 .