Distillation-based smoking article
A smoking article comprises: a combustible heat source; an aerosol-generating substrate downstream of the combustible heat source; and a heat-conducting element around and in contact with a rear portion of the combustible heat source and an adjacent front of the aerosol-generating substrate. The aerosol-generating substrate extends at least about 3 mm downstream beyond the heat-conducting element.
1. A smoking article comprising:
a combustible heat source;
an aerosol-generating substrate downstream of the combustible heat source; and
a heat-conducting element around and in contact with a rear portion of the combustible heat source and an adjacent front portion of the aerosol-generating substrate,
wherein the aerosol-generating substrate extends at least about 3 mm downstream beyond the heat-conducting element.
2. A smoking article according to claim 1 further comprising a sleeve around a rear portion of the aerosol-generating substrate, wherein the sleeve is downstream of and spaced apart from the heat-conducting element.
3. A smoking article according to claim 1 wherein the front portion of the aerosol-generating substrate abuts the rear portion of the combustible heat source.
4. A smoking article according to claim 1 wherein the rear portion of the combustible heat source and the front portion of the aerosol-generating substrate are of substantially the same dimensions.
5. A smoking article according to claim 1 further comprising:
an expansion chamber downstream of the aerosol-generating substrate.
6. A smoking article according to claim 5 further comprising:
a mouthpiece downstream of the expansion chamber.
7. A smoking article according to claim 1 wherein the combustible heat source is a porous carbon-based heat source.
8. A smoking article according to claim 1 wherein the aerosol-generating substrate comprises homogenised tobacco-based material.
9. A smoking article according to claim 1 wherein at least one longitudinal airflow channel is provided through the combustible heat source.
10. A smoking article according to claim 9 wherein a coating is provided on the inner surface of the at least one airflow channel.
11. A smoking article according to claim 1 wherein the aerosol generating substrate comprises an aerosol former having a boiling point below about 350° C.
12. A smoking article according to claim 1 wherein the combustible heat source comprises a cylinder of pyrolysed carbon having a density of about 0.5 to 0.8 g/cm 3 and a porosity of about 60 to 65%.
13. A smoking article according to claim 10 wherein the coating has a thickness of 30 to 200 microns.
14. A smoking article according to claim 1 wherein the aerosol generating substrate comprises a cylinder of plant material circumscribed by a plug wrap.
15. A smoking article according to claim 1 wherein the aerosol generating substrate comprises 5 to 40% by weight tobacco material.
16. A smoking article according to claim 1 wherein the heat conducting element surrounds about 30 to 60% of the length of the aerosol generating substrate.
17. A smoking article according to claim 2 wherein the sleeve and the heat conducting element are of the same material and separated by a gap of at least about 0.5 mm.
18. A smoking article according to claim 5 wherein the expansion chamber comprises a hollow tube.
19. A smoking article according to claim 6 wherein the mouthpiece is a reusable mouthpiece which is detachable from the smoking article.
20. A smoking article according to claim 1 having a length of about 70 to 100 mm and diameter of about 5 to 9 mm, the aerosol generating substance has a length of about 5 to 20 mm and the combustible heat source has a length of about 7 to 17 mm.