Filter with improved hardness and filtration efficiency
There is provided a smoking article comprising an aerosol generating substrate and a mouthpiece attached to the aerosol generating substrate. The mouthpiece includes a segment comprising a filtration material comprising polylactic acid, and an additive for reducing phenols. The mouthpiece further comprises one or more wrappers circumscribing the segment, the one or more wrappers have a combined basis weight of at least about 50 grams per square metre (gm- 2 ).
1. A smoking article comprising:
an aerosol generating substrate; and
a mouthpiece attached to the aerosol generating substrate, the mouthpiece comprising a segment comprising:
a filtration material comprising polylactic acid; and
an additive for reducing phenols;
wherein the additive comprises a mixture of triacetin with cellulose acetate flakes.
2. A smoking article according to claim 1 wherein the filtration material comprises a plurality of fibres formed at least in part of polylactic acid.
3. A smoking article according to claim 2 , wherein the fibres are substantially unconnected to one another.
4. A smoking article according to claim 3 , wherein the filtration material comprises a blend of the polylactic acid and at least one other polymer.
5. A smoking article according to claim 1 , wherein the filtration material comprises a blend of the polylactic acid and at least one other polymer.
6. A smoking article according to claim 5 , wherein the blend comprises a blend of the polylactic acid, polyglycolic acid and poly-(L)-lactic acid.
7. A smoking article according to claim 1 , wherein the additive for reducing phenols is dispersed amongst the filtration material.
8. A smoking article according to claim 7 , wherein the additive for reducing phenols is the only additive provided in the segment.
9. A smoking article according to claim 1 , wherein the additive for reducing phenols is the only additive provided in the segment.
10. A smoking article according to claim 1 , wherein the mouthpiece further comprises one or more wrappers circumscribing the segment, and wherein the one or more wrappers have consists of a single wrapper having a base weight of at least 50 grams per square metre (gm −2 ), or wherein the one or more wrappers consists of a plurality of wrappers, the plurality of wrappers having a combined basis weight of at least 50 grams per square metre (gm −2 ).
11. A smoking article according to claim 10 , wherein the one or more wrappers comprise a first wrapper, the first wrapper being in direct abutment with the filtration material and having a basis weight of at least 50 grams per square metre (gm −2 ).
12. A smoking article according to claim 10 , wherein the one or more wrappers consists of a single wrapper having a thickness of at least about 80 μm, or wherein the one or more wrappers consists of a plurality of wrappers, the plurality of wrappers having a combined thickness of at least 80 μm.
13. A smoking article according to claim 10 , wherein the one or more wrappers consists of a single wrapper having a bending stiffness of at least 0.08 N in a machine direction of the wrapper, or wherein the one or more wrappers consists of a plurality of wrappers, the plurality of wrappers having a combined bending stiffness of at least 0.08 N in the machine direction of the plurality of wrappers.
14. A smoking article according to claim 1 , wherein the segment has a hardness of at least about 75%.
15. A smoking article according to claim 1 , wherein the segment has an ovality, after a 50% deformation of the segment, of less than about 25%.
16. A smoking article according to claim 1 , wherein the filtration material comprises a gathered sheet of material comprising the polylactic acid.