AEROSOL-GENERATING ARTICLE WITH VENTILATION

Abstract

An aerosol-generating article is provided, including: an aerosol-generating substrate; and a downstream section extending from a downstream end of the aerosol-generating substrate to a downstream end of the aerosol-generating article, the downstream section including a first ventilation zone configured to provide ventilation into the downstream section, the first ventilation zone extending from a downstream end to an upstream end, the upstream end being less than 5 millimetres from the downstream end of the substrate, a resistance-to-draw of the downstream section being less than 10 mm H.sub.2O, and the first ventilation zone including a porous portion of the downstream section having a ventilation of at least 20 percent. An aerosol-generating system including an aerosol-generating device including a heater, and an aerosol-generating article, is also provided.

Claims

1.-15. (canceled)

16. An aerosol-generating article, comprising: an aerosol-generating substrate; and a downstream section extending from a downstream end of the aerosol-generating substrate to a downstream end of the aerosol-generating article, wherein the downstream section comprises a first ventilation zone configured to provide ventilation into the downstream section, wherein the first ventilation zone extends from a downstream end to an upstream end, the upstream end being less than 5 millimetres from the downstream end of the aerosol-generating substrate, wherein a resistance-to-draw of the downstream section is less than 10 mm H.sub.2O, and wherein the first ventilation zone comprises a porous portion of the downstream section having a ventilation of at least 20 percent.

17. The aerosol-generating article according to claim 16, further comprising a wrapper circumscribing at least a portion of the downstream section, the first ventilation zone further comprising a porous portion of the wrapper.

18. The aerosol-generating article according to claim 17, wherein the wrapper is a paper wrapper, and the first ventilation zone further comprises a portion of porous paper.

19. The aerosol-generating article according to claim 17, wherein the porous portion of the wrapper forming the first ventilation zone has a basis weight, which is lower than that of a portion of the wrapper that does not form part of the first ventilation zone.

20. The aerosol-generating article according to claim 16, wherein the downstream end of the first ventilation zone is less than 3 millimetres from the downstream end of the aerosol-generating substrate.

21. The aerosol-generating article according to claim 16, wherein the upstream end of the first ventilation zone is less than 1 millimetre from the downstream end of the aerosol-generating substrate.

22. The aerosol-generating article according to claim 16, wherein the first ventilation zone has a length of at least 2 millimetres.

23. The aerosol-generating article according to claim 16, wherein the downstream section further comprises an unobstructed airflow pathway from the downstream end of the aerosol-generating substrate to a downstream end of the downstream section.

24. The aerosol-generating article according to claim 16, wherein the downstream section has a length of at least 15 millimetres.

25. The aerosol-generating article according to claim 16, wherein the downstream end of the first ventilation zone is at least 10 millimetres from the downstream end of the aerosol-generating article.

26. The aerosol-generating article according to claim 16, wherein the upstream end of the first ventilation zone is located less than 15 percent of a way along a length of the downstream section from the downstream end of the aerosol-generating substrate.

27. The aerosol-generating article according to claim 16, wherein the downstream section further comprises a hollow tubular element.

28. The aerosol-generating article according to claim 27, wherein the hollow tubular element is spaced apart from the downstream end of the aerosol-generating substrate, the hollow tubular element being connected to the aerosol-generating substrate by a portion of porous paper wrapper.

29. An aerosol-generating system, comprising: an aerosol-generating device comprising a heater; and an aerosol-generating article according to claim 16.

Description

[0391] In the following, the invention will be further described with reference to the drawings of the accompanying Figures, wherein:

[0392] FIG. 1 shows a schematic side sectional view of an aerosol-generating article in accordance with an embodiment of the invention; and

[0393] FIG. 2 shows a schematic side sectional view of another aerosol-generating article in accordance with another embodiment of the invention.

[0394] FIG. 3 shows a schematic side sectional view of a variant of the aerosol-generating article of FIG. 1; and

[0395] FIG. 4 shows a schematic side sectional view of a variant of the aerosol-generating article of FIG. 1

[0396] The aerosol-generating article 10 shown in FIG. 1 comprises a rod of aerosol-generating substrate 12 and a downstream section 14 at a location downstream of the rod 12 of aerosol-generating substrate. Thus, the aerosol-generating article 10 extends from an upstream or distal end 16—which substantially coincides with an upstream end of the aerosol-generating substrate 12—to a downstream or mouth end 18, which coincides with a downstream end of the downstream section 14.

[0397] The aerosol-generating article 10 has an overall length of about 45 millimetres. The aerosol-generating substrate 12 comprises tobacco cut filler impregnated with about 12 percent by weight of an aerosol former, such as glycerin. The tobacco cut filler comprises 90 percent by weight of tobacco leaf lamina. The cut width of the tobacco cut filler is about 0.7 millimetres. The rod of aerosol-generating substrate 12 comprises about 130 milligrams of tobacco cut filler.

[0398] The downstream section 14 comprises a hollow tubular element 20 located downstream of the aerosol-generating substrate 12, the hollow tubular element 20 being in longitudinal alignment with the aerosol-generating substrate 12. In the embodiment of FIG. 1, the upstream end of the hollow tubular element 20 abuts the downstream end of the rod 12 of aerosol-generating substrate.

[0399] The hollow tubular element 20 defines a hollow section of the aerosol-generating article 10. The hollow tubular element does not substantially contribute to the overall RTD of the aerosol-generating article. In more detail, an RTD of the downstream section is about 0 mm H.sub.2O.

[0400] The hollow tubular element 20 is provided in the form of a hollow cylindrical tube made of cellulose acetate or of stiff paper, such as paper having a grammage of at least about 90 g/sqm. The hollow tubular element 20 defines an internal cavity 22 that extends all the way from an upstream end 24 of the hollow tubular element to a downstream end 26 of the hollow tubular element 20. The internal cavity 22 is substantially empty, and so substantially unrestricted airflow is enabled along the internal cavity 22. The hollow tubular element 20 does not substantially contribute to the overall RTD of the aerosol-generating article 10.

[0401] The hollow tubular element 20 has a length of about 33 millimetres, an external diameter (D.sub.E) of about 7.3 millimetres, and an internal diameter (D.sub.I) of about 7.1 millimetres. Thus, a thickness of a peripheral wall of the hollow tubular element 20 is about 0.1 millimetres.

[0402] The hollow tubular element 20 is spaced apart from the downstream end of the aerosol-generating substrate 12. The distance between the downstream end of the aerosol-generating substrate 12 and the upstream end of the hollow tubular element 20 is about 2 millimetres.

[0403] The hollow tubular element 20 is connected to the aerosol-generating substrate 12 by a porous paper wrapper 35. The porous paper wrapper 35 circumscribes the entire length of the hollow tubular element 20 and a downstream portion of the aerosol-generating substrate 12. The portion of the porous paper wrapper 35 overlaying the gap between the between the downstream end of the aerosol-generating substrate 12 and the upstream end of the hollow tubular element 20 allows air to enter the downstream section 14 through the porous paper wrapper 35 thereby providing a first ventilation zone 30.

[0404] The upstream end of the first ventilation zone 30 abuts the downstream end of the aerosol-generating substrate 12.

[0405] A ventilation level of the aerosol-generating article 10 provided by the first ventilation zone is about 40 percent.

[0406] In the embodiment of FIG. 1, the aerosol-generating article does not comprise any additional component upstream of the rod of aerosol-generating substrate 12 or downstream of the hollow tubular element 20.

[0407] The aerosol-generating article 100 shown in FIG. 2 differs from the aerosol-generating article 10 described above only by the provision of an upstream section at a location upstream of the aerosol-generating element. Accordingly, the aerosol-generating article 100 will only be described insofar as it differs from the aerosol-generating article 10.

[0408] The aerosol-generating article 100 comprises an upstream section comprising only one upstream element 40 at a location upstream of the aerosol-generating substrate 12. As such, the aerosol-generating article 100 extends from a distal end 16 substantially coinciding with an upstream end of the upstream element 40 to a mouth end or downstream end 18 substantially coinciding with a downstream end of the downstream section 14.

[0409] The upstream section 40 comprises an upstream element 42 located immediately upstream of the rod 12 of aerosol-generating substrate, the upstream element 42 being in longitudinal alignment with the rod 12. In the embodiment of FIG. 2, the downstream end of the upstream element 42 abuts the upstream end of the rod 12 of aerosol-generating substrate. The upstream element 42 is provided in the form of a cylindrical plug of cellulose acetate circumscribed by a stiff wrapper. The upstream element 42 has a length of about 5 millimetres. The RTD of the upstream element 42 is about 30 millimetres H.sub.2O.

[0410] FIG. 3 shows an aerosol-generating article 200 which is a variant of the aerosol-generating article 10 described above. The aerosol-generating article 200 is generally the same as the aerosol-generating article 10 of the embodiment of FIG. 1, with the exception that the aerosol-generating article 200 of the variant of the first embodiment does not comprise a cylindrical hollow tubular element 20 as described above. Instead, the aerosol-generating article 200 of the variant of the first embodiment comprises a modified tubular element 220 located downstream of the aerosol-generating element 12.

[0411] The modified tubular element 220 comprises a tubular body 222 defining a cavity 224 extending from a first end of the tubular body 222 to a second end of the tubular body 222. The modified tubular element 220 also comprises a folded end portion forming a first end wall 226 at the first end of the tubular body 222. The first end wall 226 delimits an opening 228, which permits airflow between the cavity 224 and the exterior of the modified tubular element 220. In particular, the embodiment of FIG. 3 is configured so that aerosol may flow from the aerosol-generating element 12 through the opening 228 into the cavity 224.

[0412] Much like the cavity 22 of the first embodiment shown in FIG. 1, the cavity 224 of the tubular body 222 is substantially empty, and so substantially unrestricted airflow is enabled along the cavity 222. Consequently, the RTD of the modified tubular element 220 can be localised at a specific longitudinal position of the modified tubular element 220—namely, at the first end wall 226—and can be controlled through the chosen configuration of the first end wall 226 and its corresponding opening 228. In the embodiment of FIG. 3, the RTD of the modified tubular element 220 (which is essentially the RTD of the first end wall 226) is about 5 millimetres H.sub.2O.

[0413] In the embodiment of FIG. 3, the modified tubular element 220 has a length of about 33 millimetres, an external diameter (D.sub.E)of about 7.3 millimetres, and an internal diameter (D.sub.FTS) of about 7.1 millimetres. Thus, a thickness of a peripheral wall of the tubular body 222 is about 0.1 millimetres.

[0414] FIG. 4 shows an aerosol-generating article 300 which is a variant of the aerosol-generating article 100 described above. The aerosol-generating article 300 is generally the same as the aerosol-generating article 100 of the embodiment of FIG. 2, with the exception that the aerosol-generating article 300 of the variant of the second embodiment does not comprise an upstream element 42 provided in the form of a cylindrical plug of cellulose acetate circumscribed by a stiff wrapper. Instead, the aerosol-generating article 300 of the variant of the second embodiment comprises a second tubular element 44 located immediately upstream of the aerosol-generating element 12. Consequently, in this variant of the second embodiment, the hollow tubular element 20 located immediately downstream of the aerosol-generating element 12 can be referred to as a first tubular element 20.

[0415] The second tubular element 44 comprises a tubular body 46 defining a cavity 48 extending from a first end of the tubular body 46 to a second end of the tubular body 46. The second tubular element 44 also comprises a folded end portion forming a first end wall 50 at the first end of the tubular body 46. The first end wall 50 delimits an opening 52, which permits airflow between the cavity 48 and the exterior of the second tubular element 44. In particular, the embodiment of FIG. 4 is configured so that air may flow from the cavity 48 through the opening 52 and into the aerosol-generating element 12.

[0416] Further, the second tubular element 44 comprises a second end wall 54 at the second end of its tubular body 46. This second end wall 54 is formed by folding an end portion of the second tubular element 44 at the second end of the tubular body 46. The second end wall 54 delimits an opening 56, which also permits airflow between the cavity 48 and the exterior of the second tubular element 44. In the case of the second end wall 54, the opening 56 is configured to so that air may flow from the exterior of the aerosol-generating article 300 through the opening 56 and into the cavity 48. The opening 56 therefore provides a conduit through which air can be drawn into the aerosol-generating article 300 and through the aerosol-generating element 12.

[0417] In the variant of FIG. 4, a downstream end of the second tubular element 44 abuts the upstream end of the rod 12 of aerosol-generating substrate. The second tubular element 44 has a length of about 5 millimetres. The RTD of the second tubular element 44 is about 5 millimetres H.sub.2O.