Aerosol-generating article having two wrappers

Abstract

An aerosol-generating article (10) is provided. The aerosol-generating article (10) comprises a rod of aerosol-generating substrate (12). The aerosol-generating article (10) comprises a downstream section (17) located downstream of the rod of aerosol-generating substrate (12). The downstream section (17) comprises one or more hollow tubular elements (14, 15). The aerosol-generating article (10) comprises at least two wrappers (16, 19). The at least two wrappers (16, 19) include a first wrapper (16) and a second wrapper (19). Each of the first wrapper (16) and the second wrapper (19) surrounds at least one of the rod of aerosol-generating substrate (12) and the downstream section (17). Each of the first wrapper (16) and the second wrapper (19) has a bulk of 1.42 cubic centimeters per gram or less. The first wrapper (16) and the second wrapper (19) each form at least a portion of the outer surface of the aerosol-generating article (10).

Description

[Technical Field]

[0001] The present disclosure relates to an aerosol-generating article comprising a rod of aerosol-generating substrate and at least two wrappers. [Background technology]

[0002] Aerosol-generating articles in which an aerosol-generating substrate, such as a tobacco-containing substrate, is heated rather than combusted are known in the art. In heated aerosol-generating articles, the aerosol is generated by heating the aerosol-generating substrate.

[0003] It is known to provide a heating element for heating an aerosol-generating substrate of an aerosol-generating article. The heating element may be provided in the article in the form of a susceptor element that can be heated when penetrated by a changing magnetic field. Alternatively, or additionally, the heating element may be provided in an aerosol-generating device for generating inhalable vapor. Such a device may heat the aerosol-generating substrate contained in the aerosol-generating article without burning the aerosol-generating substrate. The aerosol-generating article may have a rod shape configured for insertion of a portion of the aerosol-generating article into a device cavity of the aerosol-generating device. The aerosol-generating device may also include a heating element configured for insertion into the rod of the aerosol-generating substrate. The heating element may be located within the device cavity. When the aerosol-generating substrate of the aerosol-generating article is received in the device cavity, the heating element may penetrate the aerosol-generating substrate and be inserted into the aerosol-generating substrate to heat the aerosol-generating substrate from the inside.

[0004] The heatable aerosol-generating article may comprise one or more wrappers surrounding at least a portion of the aerosol-generating article. The provision of one or more wrappers may secure the components of the aerosol-generating article together.

[0005] During use, the outer peripheral portion of the aerosol-generating substrate, which is farther from the heating element, may receive less heat from the heating element than the portion of the aerosol-generating substrate closer to the heating element. This results in a temperature gradient that can encourage condensate and slurry to migrate to cooler portions of the aerosol-generating substrate, such as the outer periphery of the substrate. As a result, the wrapper may become soiled, damp, or wet during use. Wetting the wrapper reduces the tensile strength of the wrapper and can cause the aerosol-generating article to fracture inside the device cavity of the aerosol-generating device, particularly at the joints between the components of the aerosol-generating article, when the aerosol-generating article is removed after use.

[0006] It is also known to provide aerosol-generating articles with wrappers printed with a coating, such as a lip release lacquer or, for example, indicia or a distinctive color on the surface of the wrapper to provide a more aesthetically appealing and distinctive appearance to the aerosol-generating article. However, it may be desirable to provide the coating, indicia, or distinctive color on only a portion of the length of the wrapper, such as the mouth end of the aerosol-generating article. However, this may increase the complexity of the manufacturing process if the coating, indicia, or distinctive color is applied to only a portion of the surface of the wrapper.

[0007] It would be desirable to provide a wrapper with increased wet and dry tensile strength to increase the mechanical robustness of the aerosol-generating article, particularly to reduce the risk of breakage during extraction of the aerosol-generating article from the device cavity of the aerosol-generating device after use. Furthermore, it would be desirable to configure the wrapper so that coatings, indicia, or distinctive colors can be more easily applied to different portions of the aerosol-generating article without requiring complex manufacturing techniques or modification of existing manufacturing processes. Summary of the Invention

[0008] According to the present invention, there is provided an aerosol-generating article. The aerosol-generating article may comprise a rod of an aerosol-generating substrate. The aerosol-generating article may comprise a downstream section located downstream of the rod of the aerosol-generating substrate. The downstream section may comprise one or more hollow tubular elements. The aerosol-generating article may comprise at least two wrappers. The at least two wrappers may include a first wrapper and a second wrapper. Each of the first wrapper and the second wrapper may surround at least one of the rod and the downstream section of the aerosol-generating substrate. Each of the first wrapper and the second wrapper may have a bulk of 1.42 cubic centimeters per gram or less. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view of an aerosol-generating article according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view of an aerosol-generating article according to a second embodiment of the present disclosure. [Figure 3] FIG. 2 is a cross-sectional view of an aerosol-generating article according to a third embodiment of the present disclosure. [Figure 4] 2 is a cross-sectional view of an aerosol generating system including the aerosol-generating article of FIG. 1 and an aerosol generating device. [Figure 5] 3 is a cross-sectional view of an aerosol generating system including the aerosol-generating article of FIG. 2 and an aerosol generating device. DETAILED DESCRIPTION OF THE INVENTION

[0010] The invention will now be further described, by way of example only, with reference to the accompanying drawings, in which:

[0011] Figure 1 shows a schematic cross-sectional view of an aerosol-generating article 10. The aerosol-generating article 10 has a substantially cylindrical shape along its length. The aerosol-generating article 10 comprises a rod of aerosol-generating substrate 12. The rod of aerosol-generating substrate 12 has a substantially cylindrical shape along its length and comprises an assembly of homogenized tobacco sheets. The article further comprises a downstream section 17 located downstream of the rod of aerosol-generating substrate 12. The downstream section 17 comprises a first hollow tubular element 14, a second hollow tubular element 15, and a mouth-end filter 18. The mouth-end filter 18 is at the proximal (downstream) end of the article 10.

[0012] The downstream section 17 comprises an intermediate section 17a located between the rod 12 of the aerosol-generating substrate and the mouth-end filter 18. The intermediate section 17a comprises a first hollow tubular element 14 and a second hollow tubular element 15.

[0013] The aerosol-generating article 10 further comprises an upstream element 11 at the distal (upstream) end of the article 10. The upstream element 11 is a solid cylindrical plug element having a filled cross-section. The upstream element 11 comprises cellulose acetate. The RTD of the upstream element is 5.5 millimeters of water. A longitudinal axis 7 extends centrally along the longitudinal direction of the aerosol-generating article 10. In this embodiment, the upstream element 11 has a length of 5 millimeters. The upstream element 11, the aerosol-generating substrate rod 12, the first hollow tubular element 14, the second hollow tubular element 15, and the mouth-end filter 18 are arranged end-to-end along the longitudinal axis 7.

[0014] The aerosol-generating article 10 comprises an upstream element 11, a rod of aerosol-generating substrate 12, and an aerosol-forming section 17b comprising an intermediate section 17a.

[0015] The upstream element 11, the aerosol-generating substrate rod 12, the first hollow tubular element 14, and the second hollow tubular element 15 are surrounded by a first wrapper 16. The first wrapper 16 does not surround the mouth-end filter 18; that is, the first wrapper 16 surrounds only the aerosol-forming section 17b. The first wrapper 16 extends from the upstream end of the article 10. The first wrapper 16 is made of paper.

[0016] The second hollow tubular element 15 and the mouth end filter 18 are surrounded by a second wrapper 19. The second wrapper 19 overlaps a portion of the first wrapper 16. The second wrapper 19 extends from the downstream end of the article 10.

[0017] First wrapper 16 has a first wrapper length. In this embodiment, the first wrapper length is 33 millimeters. The first wrapper length is 73 percent of the length of article 10. Second wrapper 19 has a second wrapper length. In this embodiment, the second wrapper length is 21 millimeters. The second wrapper length is 47 percent of the length of article 10.

[0018] In this embodiment, the overlap length of the first wrapper 16 and the second wrapper 19 in the direction parallel to the longitudinal axis 7 is equal to the length of the second hollow tubular element 15. That is, the overlap length of the first wrapper 16 and the second wrapper is 9 millimeters.

[0019] The downstream end of the second wrapper 19 is downstream of the downstream end of the first wrapper 16. The upstream end of the first wrapper 16 is upstream of the upstream end of the second wrapper 19.

[0020] The first wrapper 16 has a thickness of 41 micrometers. The basis weight of the first wrapper 16 is 36 grams per square meter (gsm). The bulk of the first wrapper 16 is 1.14 cubic centimeters per gram. The second wrapper 19 has a thickness of 45 micrometers. The basis weight of the second wrapper 19 is 39 grams per square meter (gsm). The bulk of the second wrapper 19 is 1.15 cubic centimeters per gram.

[0021] Each of the first wrapper 16 and the second wrapper 19 does not extend beyond the ends of the aerosol-generating article 10 in a direction parallel to the longitudinal axis 7 .

[0022] The first wrapper 16 and the second wrapper 19 each form a portion of the outer surface of the aerosol-generating article 10. That is, along the longitudinal axis 7, either the first wrapper 16 or the second wrapper 19 is the radially outermost layer of the article 10. The second wrapper 19 has printed elements on its outer surface, which in this example are a pattern and a color.

[0023] Of course, in addition to the first wrapper 16 and the second wrapper 19, one or more of the components such as the upstream element 11, the aerosol-generating substrate rod 12, and the mouth-end filter 18 may each be surrounded by an individual wrapper (not shown) underlying at least one of the first wrapper 16 and the second wrapper 19.

[0024] The rod 12 of aerosol-generating substrate has a rod length parallel to the longitudinal axis 7 of the aerosol-generating article 10 and a rod width perpendicular to the longitudinal axis 7 of the aerosol-generating article 10. The rod width is substantially uniform along the rod length. In this example, the rod width is 7 millimeters. In this example, the rod length is 11 millimeters. The resistance to draw (RTD) of the rod 12 of aerosol-generating substrate is 13.6 millimeters of water column. The length of the aerosol-generating article 10 is 45 millimeters. The resistance to draw (RTD) of the aerosol-generating article 10 is 46 millimeters of water column.

[0025] The aerosol-generating article 10 further comprises a susceptor element 12a disposed within the aerosol-generating substrate rod 12. The susceptor element 12a is configured to be heated when penetrated by a changing magnetic field. The length of the susceptor element 12a is approximately equal to the rod length; that is, the length of the susceptor element 12a is 11 millimeters. The width of the susceptor element 12a is 4 millimeters, and the thickness of the susceptor element 12a is 60 micrometers.

[0026] As described above, the downstream section 17 includes the mouth-end filter 18, the second hollow tubular element 15, and the first hollow tubular element 14. The downstream section 17 extends between the aerosol-generating substrate rod 12 and the downstream end of the aerosol-generating article 10. The downstream section 17 has a length of 29 millimeters. The second hollow tubular element 15 is downstream of the first hollow tubular element 14. The first hollow tubular element 14 is a hollow acetate tube. The second hollow tubular element 15 is a hollow acetate tube. The first hollow tubular element 14 abuts the downstream end of the aerosol-generating substrate rod 12. The length of the first hollow tubular element 14 is 8 millimeters. The length of the second hollow tubular element 15 is 9 millimeters.

[0027] The first hollow tubular element 14 includes a lumen. The lumen of the first hollow tubular element 14 has a substantially circular cross-sectional shape. The second hollow tubular element 15 includes a lumen. The lumen of the second hollow tubular element 15 has a substantially circular cross-sectional shape. The width (internal width) of the lumen of the second hollow tubular element 15 is greater than the width (internal width) of the lumen of the first hollow tubular element 14. The wall thickness of the second hollow tubular element 15 is less than the wall thickness of the first hollow tubular element 14. The second hollow tubular element 15 may be referred to as fine hollow acetate tubing (FHAT). The wall thickness of the second hollow tubular element 15 is 1.05 millimeters. The wall thickness of the second hollow tubular element 14 is 1.9 millimeters. The width of each of the first hollow tubular element 14 and the second hollow tubular element 15 is 7.1 millimeters of water column. The combined RTD of the first hollow tubular element 14 and the second hollow tubular element 15 is about 0 millimeters of water.

[0028] The second hollow tubular element 15 includes a ventilation zone located along the second hollow tubular element 15. It will be understood that a ventilation zone may alternatively or additionally be provided along the first hollow tubular element 14. The ventilation zone includes one or more rows of ventilation holes 13 circumferentially disposed around the second hollow tubular element 15 in a cross section substantially perpendicular to the longitudinal axis 7 of the aerosol-generating article 10. The ventilation holes 13 are perforations through the wall of the second hollow tubular element 15. The ventilation level of the aerosol-generating article 10 is approximately 50 percent. Each circumferential row of ventilation holes 13 includes 11 holes. The ventilation holes 13 extend through both the first wrapper 16 and the second wrapper 19 in a direction perpendicular to the longitudinal axis 7. The distance of the ventilation holes 13 from the downstream end of the article 10 is 18 millimeters.

[0029] The mouth-end filter 18 is located at the downstream end of the aerosol-generating article 10. The mouth-end filter 18 abuts the downstream end of the second hollow tubular element 15. The mouth-end filter 18 comprises a low-density cellulose acetate filter segment. The RTD of the mouth-end filter 18 is approximately 18 millimeters of water column. The length of the mouth-end filter 18 is 12 millimeters. The width of the mouth-end filter 18 is 7.2 millimeters.

[0030] FIG. 2 shows a schematic cross-sectional view of an aerosol-generating article 20. The aerosol-generating article 20 has a substantially cylindrical shape along its length. The aerosol-generating article 20 comprises a rod of aerosol-generating substrate 22 at the distal end of the article 20. The rod of aerosol-generating substrate 22 has a substantially cylindrical shape along its length and comprises an assembly of homogenized tobacco sheets. The article further comprises a downstream section 27 located downstream of the rod of aerosol-generating substrate 22. The downstream section 27 comprises a hollow tubular element 24, a PLA (polylactic acid) plug 25, and a mouth-end filter 28. The mouth-end filter 28 is at the proximal end of the article 20. A longitudinal axis 7 extends centrally along the longitudinal direction of the aerosol-generating article 20. The rod of aerosol-generating substrate 22, the hollow tubular element 24, the PLA plug 25, and the mouth-end filter 28 are arranged end-to-end along the longitudinal axis 7.

[0031] The downstream section 27 comprises an intermediate section 27a located between the aerosol-generating substrate rod 22 and the mouth-end filter 28. The intermediate section 27a comprises a hollow tubular element 24 and a PLA plug 25.

[0032] The aerosol-generating article 20 comprises a rod 22 of aerosol-generating substrate and an aerosol-forming section 27b comprising an intermediate section 27a.

[0033] The aerosol-generating substrate rod 22, hollow tubular element 24, PLA plug 25, and mouth-end filter 28 are surrounded by a first wrapper 26. The first wrapper 26 extends along the entire length of the aerosol-generating article 20. It will be appreciated that in other embodiments, the first wrapper 26 may not extend along the entire length of the aerosol-generating article 20, and may, for example, not surround the mouth-end filter 28. The first wrapper 26 is made of paper.

[0034] The PLA plug 25 and the mouth end filter 28 are surrounded by a second wrapper 29. The second wrapper 29 overlaps a portion of the first wrapper 26. The second wrapper 29 extends from the downstream end of the article 20.

[0035] The first wrapper 26 has a first wrapper length. In this example, the first wrapper length is equal to the length of the aerosol-generating article 20. That is, the first wrapper length is 45 micrometers. The second wrapper 29 has a second wrapper length. In this example, the second wrapper length is 20 millimeters. The second wrapper length is 44 percent of the length of the article 20.

[0036] In this embodiment, the length of the overlap between the first wrapper 26 and the second wrapper 29 in a direction parallel to the longitudinal axis of the article is equal to the length of the second wrapper.

[0037] The downstream end of second wrapper 29 is co-located along longitudinal axis 7 with the downstream end of first wrapper 26. The upstream end of first wrapper 26 is upstream of the upstream end of second wrapper 29.

[0038] The first wrapper 26 has a thickness of 41 micrometers. The basis weight of the first wrapper 26 is 36 grams per square meter (gsm). The bulk of the first wrapper 26 is 1.14 cubic centimeters per gram. The second wrapper 29 has a thickness of 45 micrometers. The basis weight of the second wrapper 29 is 39 grams per square meter (gsm). The bulk of the second wrapper 29 is 1.15 cubic centimeters per gram.

[0039] Each of the first wrapper 26 and the second wrapper 29 does not extend beyond the ends of the aerosol-generating article 20 in a direction parallel to the longitudinal axis 7 .

[0040] The first wrapper 26 and the second wrapper 29 each form a portion of the outer surface of the aerosol-generating article 20. That is, along the longitudinal axis 7, either the first wrapper 26 or the second wrapper 29 is the radially outermost layer of the article 10. The second wrapper 29 has elements printed on the outer surface of the second wrapper 19, which in this example are a pattern and a color.

[0041] The rod 22 of aerosol-generating substrate has a rod length parallel to the longitudinal axis 7 of the aerosol-generating article 20. The rod 22 of aerosol-generating substrate has a rod width perpendicular to the longitudinal axis 7 of the aerosol-generating article 20. The rod width is substantially uniform along the rod length. In this example, the rod width is 7.2 millimeters. In this example, the rod length is 12 millimeters. The length of the aerosol-generating article 20 is 45 millimeters.

[0042] As mentioned above, downstream section 22 includes mouth-end filter 28, PLA (polylactic acid) plug 25, and hollow tubular element 24. Downstream section 27 extends between aerosol-generating substrate rod 21 and the downstream end of aerosol-generating article 20. Downstream section 27 has a length of 33 millimeters.

[0043] The PLA plug 25 is downstream of the hollow tubular element 24. The hollow tubular element 24 is a hollow acetate tube. The hollow tubular element 24 abuts the downstream end of the aerosol-generating substrate rod 22. The hollow tubular element 24 has a length of 8 millimeters. The PLA plug 25 has a length of 18 millimeters. The hollow tubular element 24 includes a lumen. The lumen of the hollow tubular element 24 has a substantially circular cross-sectional shape. The wall thickness of the hollow tubular element 24 is 0.25 millimeters. The outer diameter of the hollow tubular element 24 is 7.2 millimeters. The RTD of the hollow tubular element 24 is approximately 0 millimeters of water column.

[0044] The mouth-end filter 28 is located at the downstream end of the aerosol-generating article 10. The mouth-end filter 28 abuts the downstream end of the PLA plug 25. The mouth-end filter 28 comprises low-density cellulose acetate filter segments. The RTD of the mouth-end filter 28 is approximately 8 millimeters of water column. The length of the mouth-end filter 28 is approximately 7 millimeters.

[0045] 3 shows a schematic cross-sectional view of an aerosol-generating article 30. The aerosol-generating article 30 has a substantially circular cross-sectional shape along its length. The aerosol-generating article 30 comprises a rod of aerosol-generating substrate 32. The rod of aerosol-generating substrate 32 has a substantially cylindrical shape along its length and comprises a collection of crimped sheets of homogenized tobacco.

[0046] The article 30 further comprises a downstream section 37 located downstream from the rod of aerosol-generating substrate 32. The downstream section 37 includes a mouth-end filter 38. The mouth-end filter 38 is at the proximal end of the article 30. A longitudinal axis 7 extends centrally along the longitudinal direction of the aerosol-generating article 30. The downstream section 37 also includes a hollow tubular element 34 including a tubular body defining a cavity 34b extending from the upstream end of the tubular body to the downstream end of the tubular body. The hollow tubular element (hereinafter referred to as the flanged tube 34) also includes a folded end portion that forms an upstream end wall 34c at the upstream end of the tubular body. The rod of aerosol-generating substrate 32, the flanged tube 34, and the mouth-end filter 38 are disposed end-to-end along the longitudinal axis 7.

[0047] The downstream section 37 comprises an intermediate section 37a located between the rod 32 of the aerosol-generating substrate and the mouth-end filter 38. The intermediate section 37a comprises a flanged pipe 34.

[0048] The aerosol-generating article 30 further comprises an upstream element 31 at the distal end of the article 30. The upstream element 31 comprises a tubular segment. In this example, the length of the upstream element 31 is 5 millimeters.

[0049] The aerosol-generating article 30 comprises an upstream element 31, a rod of aerosol-generating substrate 32, and an aerosol-forming section 37b comprising an intermediate section 37a.

[0050] The upstream element 31, the aerosol-generating substrate rod 32, and the flanged tube 34 are surrounded by a first wrapper 36. The first wrapper 36 does not surround the mouth-end filter 38; that is, the first wrapper 36 surrounds only the aerosol-forming section 37b. The first wrapper 36 extends from the upstream end of the article 30. The first wrapper 36 is made of paper.

[0051] A portion of the flange pipe 34 and the entire length of the mouth end filter 18 are surrounded by a second wrapper 39. The second wrapper 39 overlaps a portion of the first wrapper 36. The second wrapper 19 extends from the downstream end of the article 30.

[0052] The first wrapper 36 has a first wrapper length. In this embodiment, the first wrapper length is 38 millimeters. The first wrapper length is 84 percent of the length of the article 30. The second wrapper 39 has a second wrapper length. In this embodiment, the second wrapper length is 26 millimeters. The second wrapper length is 58 percent of the length of the article 30.

[0053] In this embodiment, the overlap length of the first wrapper 36 and the second wrapper 39 in the direction parallel to the longitudinal axis of the article is 19 millimeters.

[0054] The downstream end of the second wrapper 39 is downstream of the downstream end of the first wrapper 36. The upstream end of the first wrapper 36 is upstream of the upstream end of the second wrapper 39.

[0055] The first wrapper 36 has a thickness of 41 micrometers. The basis weight of the first wrapper 36 is 36 grams per square meter (gsm). The bulk of the first wrapper 36 is 1.14 cubic centimeters per gram. The second wrapper 39 has a thickness of 66 micrometers. The basis weight of the second wrapper 39 is 58 grams per square meter (gsm). The bulk of the second wrapper 39 is 1.14 cubic centimeters per gram.

[0056] Each of the first wrapper 36 and second wrapper 39 does not extend beyond the ends of the aerosol-generating article 30 in a direction parallel to the longitudinal axis 7 .

[0057] The first wrapper 36 and the second wrapper 39 each form a portion of the outer surface of the aerosol-generating article 30. That is, along the longitudinal axis 7, either the first wrapper 36 or the second wrapper 39 is the radially outermost layer of the article 30. The second wrapper 39 has printed elements on its outer surface, which in this example are a pattern and a color.

[0058] The rod 32 of aerosol-generating substrate has a rod length parallel to the longitudinal axis 7 of the aerosol-generating article 30. The rod 32 of aerosol-generating substrate has a rod width perpendicular to the longitudinal axis 7 of the aerosol-generating article 30. The rod width is substantially uniform along the rod length. In this example, the rod width is 7.1 millimeters. In this example, the rod length 28 is 12 millimeters. The length of the aerosol-generating article is 45 millimeters.

[0059] As mentioned above, the downstream section 37 includes the mouth end filter 38 and the flanged pipe 34. The downstream section 37 extends between the aerosol-generating substrate rod 32 and the downstream end of the aerosol-generating article 30. The downstream section 37 has a length of 28 millimeters.

[0060] The flange tube 34 abuts the downstream end of the aerosol-generating substrate rod 32. The upstream end wall 34c of the flange tube 34 defines an opening 34d, which allows airflow between the cavity 34b and the exterior of the flange tube 34. In particular, aerosol can flow from the aerosol-generating substrate rod 32 into the cavity 34b through the opening 34d. The cavity 34b of the flange tube 34 is substantially empty, allowing substantially unrestricted airflow along the cavity 34b. As a result, the RTD of the flange tube 34 can be localized to a particular longitudinal location of the flange tube 34, i.e., the upstream end wall 34c, and can be controlled through the selected configuration of the upstream end wall 34c and its corresponding opening 34d. In this example, the RTD of the flange tube 34 (which is essentially the RTD of the upstream end wall 34c) is approximately 10 millimeters of water column.

[0061] The upstream end wall 34c extends substantially transversely to the longitudinal axis 7 of the aerosol-generating article 30. The opening 34d is the only opening in the upstream end wall 34c, and the opening 34d is located at a generally radially central position of the flange tube 34. As a result, the upstream end wall 34c is generally annular in shape. The combination of the upstream end wall 34c and its corresponding opening 34d provides an effective barrier arrangement that can restrict movement of the aerosol-generating substrate rod 32 while also allowing aerosol to flow from the aerosol-generating substrate rod 32 through the opening 34d and into the cavity 34b. The flange tube 34 has a length of approximately 21 millimeters and an external width of approximately 7.1 millimeters. The flange tube 34 is formed from a paper material, such as paper, paperboard, or cardboard. In this embodiment, the cavity 34b of the flange tube 34 has a substantially circular cross-sectional shape.

[0062] The flanged tube 34 includes a vent zone located along the flanged tube 34. The vent zone includes one or more rows of vent holes 33 arranged circumferentially around the hollow tube in a cross section substantially perpendicular to the longitudinal axis 7 of the aerosol-generating article 30. The vent holes 33 are perforations through the wall of the flanged tube 34. The aerosol-generating article 30 has a ventilation level of approximately 75 percent. Each circumferential row of vent holes 33 includes between 8 and 30 holes. The vent holes 33 extend through both the first wrapper 36 and the second wrapper 39 in a direction perpendicular to the longitudinal axis 7. The distance of the vent holes 33 from the downstream end of the article 30 is 16 millimeters.

[0063] The mouth-end filter 38 is located at the downstream end of the aerosol-generating article 30. The mouth-end filter 38 abuts the flanged pipe 34. The mouth-end filter 38 comprises a low-density cellulose acetate filter segment. The RTD of the mouth-end filter 38 is approximately 8 millimeters of water column. The length of the mouth-end filter 38 is approximately 7 millimeters.

[0064] FIG. 4 shows a schematic cross-sectional view of a portion of an aerosol generation system 1000 comprising the aerosol-generating article 10 of FIG. 1 and an aerosol-generating device 100.

[0065] In this embodiment, the aerosol-generating article 10 comprises a susceptor element 12a disposed within an aerosol-generating substrate rod 12. The susceptor element 12a is configured to be heated when penetrated by a changing magnetic field.

[0066] The aerosol generating device 100 further comprises an inductor coil 126 surrounding the device cavity 121 and surrounding the susceptor element 12a. The inductor coil 126 is arranged to generate a varying magnetic field within the device cavity 121 that penetrates and inductively heats the susceptor element 12a.

[0067] The device cavity 121 is configured to receive at least a portion of the aerosol-generating article 10. The distal end of the device cavity 121 has a closed end. The proximal end of the device cavity 121 has an open end. The aerosol-generating article 10 is insertable into the device cavity 121 via the open end of the device cavity 221.

[0068] In use, a user inserts the aerosol-generating article 10 into the device cavity 121 of the aerosol-generating device 100 .

[0069] The aerosol generating device 100 further comprises a power supply (not shown) and electronics (not shown) arranged to supply power to the inductor coil 226 to generate a changing magnetic field within the device cavity 121 and thereby inductively heat the susceptor element 12a.

[0070] The susceptor element 12a heats the aerosol-generating substrate rod 12 when the aerosol-generating article 10 is received within the device cavity 121. Such activation of the inductor coil 126 may be manual, or may occur automatically in response to a user inhaling the aerosol-generating article 10 when it is inserted into the device cavity 121.

[0071] The entire length of the rod 12 of the aerosol-generating substrate is received within the device cavity 121. The device cavity 121 has a substantially circular cross-sectional shape. The device cavity 121 has substantially the same cross-sectional shape as the rod 12 of the aerosol-generating substrate. The vent hole 13 of the second hollow tubular element 15 is not received within the device cavity 121.

[0072] In use, the inductor coil 126 is controlled to heat the susceptor element 12a within a defined operating temperature range below the maximum operating temperature, which is approximately 350 degrees Celsius.

[0073] FIG. 5 shows a schematic cross-sectional view of a portion of an aerosol-generating system 2000 comprising the aerosol-generating article 20 of FIG. 2 and an aerosol-generating device 200.

[0074] The aerosol-generating device 200 comprises a heating element in the form of a blade 220. The blade 220 is a resistive heating element. The blade 220 is mounted within a device cavity 221. The device cavity 221 is configured to receive at least a portion of the aerosol-generating article 20. The distal end of the device cavity 221 has a closed end. The proximal end of the device cavity 221 has an open end. The aerosol-generating article 20 is insertable into the device cavity 221 via the open end of the device cavity 221.

[0075] In use, a user inserts the aerosol-generating article 20 into the device cavity 221 of the aerosol-generating device 200 so that the blade 220 is inserted into the rod 22 of the aerosol-generating substrate of the aerosol-generating article 20. The blade 220 tapers to a tip at the end of the blade such that the tip of the blade 220 is configured to penetrate the rod 22 of the aerosol-generating substrate.

[0076] The aerosol-generating device 200 further comprises a power source (not shown) and electronics (not shown) that enable actuation of the blades 220 to heat the rod 22 of the aerosol-generating substrate when the aerosol-generating article 20 is received within the device cavity 221. Such actuation may be manual, or may occur automatically in response to a user inhaling the aerosol-generating article 20 when it is inserted into the device cavity 221.

[0077] 5, a portion of the aerosol-generating article 20 is received within a device cavity 221 of the aerosol-generating device 20, with the blade 220 penetrating the rod of aerosol-generating substrate 22 along the longitudinal axis 7 of the aerosol-generating article. The entire length of the rod of aerosol-generating substrate 22 is received within the device cavity 221. The device cavity 221 has a substantially circular cross-sectional shape. The device cavity 221 has substantially the same cross-sectional shape as the rod of aerosol-generating substrate 22.

[0078] During use, blade 220 is controlled to operate within a defined operating temperature range below a maximum operating temperature, which is approximately 350 degrees Celsius.

[0079] According to the present invention, there is provided an aerosol-generating article. The aerosol-generating article comprises a rod of an aerosol-generating substrate. The aerosol-generating article comprises a downstream section located downstream of the rod of the aerosol-generating substrate. The downstream section comprises one or more hollow tubular elements. The aerosol-generating article comprises at least two wrappers. The at least two wrappers include a first wrapper and a second wrapper. Each of the first wrapper and the second wrapper surrounds at least one of the rod and the downstream section of the aerosol-generating substrate. Each of the first wrapper and the second wrapper has a bulk of 1.42 cubic centimeters per gram or less.

[0080] Advantageously, providing an aerosol-generating article with at least two wrappers allows for different properties to be provided for each of the at least two wrappers. For example, one of the at least two wrappers may be provided with one or more coatings, indicia, or distinctive colors printed thereon, and another of the at least two wrappers may be provided without the coating, indicia, or distinctive color. Alternatively, for example, one of the at least two wrappers may be provided with one or more coatings, indicia, or distinctive colors printed thereon, and another of the at least two wrappers may be provided with a different selection of one or more coatings, indicia, or distinctive colors. Advantageously, the ability to provide different properties for each of the at least two wrappers may improve the versatility with which the article can be constructed compared to an article with a single wrapper. Advantageously, the ability to easily provide different properties for each of the at least two wrappers may improve the versatility with which the article can be constructed without increasing the complexity of the article's manufacture and without requiring modification of existing manufacturing processes. This may also reduce manufacturing costs. For example, existing manufacturing techniques can be used to provide different properties to each of the at least two wrappers, and then the at least two wrappers can be combined in different configurations relative to each other to arrive at a desired property distribution.

[0081] Advantageously, providing the first wrapper and the second wrapper with a bulk of 1.42 cubic centimeters per gram or less provides the desired tensile strength of each of the first wrapper and the second wrapper in both dry conditions (dry tensile strength) and wet conditions (wet tensile strength).

[0082] For example, it was surprisingly found that reducing the bulk of a wrapper from 1.44 (a typical wrapper bulk value) to 1.13 resulted in a 75 percent increase in the dry tensile strength of the wrapper (as measured according to ISO standard 1924-2:2008). Prior to testing, the wrappers were conditioned for at least 24 hours at 22±2 degrees Celsius and 60±5% relative humidity.

[0083] Furthermore, it has surprisingly been found that reducing the bulk of the wrapper from 1.44 to 1.13 results in an approximately 20 to 40 percent increase in the vertical force required to fracture the aerosol-generating article (lying horizontally) at the joint between the components of the aerosol-generating article wrapped by the wrapper, both before use of the aerosol-generating article and one minute after use.

[0084] For example, it was found that before use of the aerosol-generating article, the vertical force required to break a horizontally lying aerosol-generating article at the junction between two hollow tubular elements wrapped with a wrapper having a bulk of 1.13 was about 27 percent higher than for an aerosol-generating article that differed only in the provision of a wrapper with a higher bulk of 1.44. Furthermore, one minute after use of the aerosol-generating article, the vertical force required to break a horizontally lying aerosol-generating article at the junction between two tubular hollow tubular elements wrapped with a wrapper having a bulk of 1.13 was about 20 percent higher than for an aerosol-generating article that differed only in the provision of a wrapper with a higher bulk of 1.44.

[0085] In a further example, it was found that before use of the aerosol-generating article, the vertical force required to break a horizontally lying aerosol-generating article at the junction between the rod of the aerosol-generating substrate and the element immediately upstream of the rod of the aerosol-generating substrate wrapped with a wrapper having a bulk of 1.13 was about 27 percent higher than for an aerosol-generating article that differed only in providing a wrapper with a higher bulk of 1.44. Furthermore, it was found that after one minute of use of the aerosol-generating article, the vertical force required to break a horizontally lying aerosol-generating article at the junction between the rod of the aerosol-generating substrate and the element immediately upstream of the rod of the aerosol-generating substrate wrapped with a wrapper having a bulk of 1.13 was about 40 percent higher than for an aerosol-generating article that differed only in providing a wrapper with a higher bulk of 1.44.

[0086] Advantageously, providing the first wrapper and second wrapper with improved tensile strength reduces the risk of breakage of the aerosol-generating article, particularly at the joints between the components, when the aerosol-generating article is extracted from the device after use.

[0087] As used herein, the term "aerosol-generating substrate" means a substrate that is capable of condensing to form an aerosol and that is capable of releasing volatile compounds upon heating.

[0088] As used herein, the term "aerosol" means a dispersion of solid particles, or liquid droplets, or a combination of solid particles and liquid droplets, in a gas. An aerosol can be visible or invisible. An aerosol may contain not only vapor of a substance that is normally a liquid or solid at room temperature, but also solid particles or liquid droplets, or a combination of solid particles and liquid droplets.

[0089] As used herein, the term "aerosol-generating article" means an article comprising an aerosol-generating substrate capable of emitting a volatile compound capable of forming an aerosol. The aerosol-generating article may be disposable.

[0090] As used herein, the terms "upstream," "downstream," "proximal," and "distal" are used to describe the relative positions of elements or portions of elements of aerosol-generating articles, aerosol-generating devices, and aerosol-generating systems according to the present disclosure. The aerosol-generating articles described herein have a proximal end through which aerosol is expelled from the aerosol-generating article during use. The proximal end may also be referred to as the mouth end. During use, to inhale the aerosol generated by the aerosol-generating article, a user draws on the proximal or mouth end of the aerosol-generating article. The aerosol-generating article has a distal end opposite the proximal or mouth end. The proximal or mouth end of the aerosol-generating article may also be referred to as the downstream end. The distal end of the aerosol-generating article may also be referred to as the upstream end. Components, or portions of components, of an aerosol-generating article may be described as being upstream or downstream of one another based on the relative positions between the proximal or downstream end and the distal or upstream end of the aerosol-generating article.

[0091] As used herein, the term "longitudinal direction" is used to describe the direction between a downstream or proximal end and an opposing upstream or distal end of aerosol-generating articles, aerosol generating devices, and aerosol generating systems according to the present invention.

[0092] As used herein, the term "length" is used to describe the greatest dimension in the longitudinal direction or along the longitudinal axis of an element or portion of an element of an aerosol-generating article, aerosol-generating device, and aerosol-generating system according to the present disclosure.

[0093] The term "transverse" as used herein is used to describe the direction perpendicular to the longitudinal axis.

[0094] As used herein, the term "width" is used to describe the maximum transverse dimension of an element, or portion of an element, of the aerosol-generating articles, aerosol-generating devices, and aerosol-generating systems of the present disclosure. For the avoidance of doubt, as used herein, the term "diameter" may be used to refer to the "width" of an element, or portion of an element, having a circular transverse cross-section of the aerosol-generating articles, aerosol-generating devices, and aerosol-generating systems of the present disclosure.

[0095] Unless otherwise specified, references to a "cross section" of an aerosol-generating article or a component of an aerosol-generating article refer to a transverse cross section taken perpendicular to the longitudinal axis or axis.

[0096] As used herein, the term "hollow tubular element" refers to a generally elongated element that defines a lumen or airflow passage along its longitudinal axis. In particular, the term "tubular" is used hereinafter with reference to a tubular element that has a substantially cylindrical cross-section and defines at least one airflow conduit that establishes uninterrupted fluid communication between the upstream end of the tubular element and the downstream end of the tubular element. However, it will be understood that alternative shapes (e.g., alternative cross-sectional shapes) of the tubular element may be possible.

[0097] As used herein, the term "bulk" is defined as the inverse or reciprocal of density. Specifically, for wrappers, bulk is calculated by dividing the thickness of the wrapper by the basis weight of the wrapper.

[0098] As used herein, "grammage" or "basis weight" is equivalent and is defined as being equal to the mass per unit area of ​​the wrapper, for example. Basis weight may be determined according to ISO standard 536:2012.

[0099] As used herein, the term "thickness" is used to describe, for example, the smallest dimension of a wrapper. Thickness is measured perpendicular to the length and width of the wrapper. Thickness may be determined in accordance with ISO standard 534:2012.

[0100] Unless otherwise stated, measurements made on the wrappers described herein are made at 23 degrees Celsius and 50 percent relative humidity.

[0101] The at least two wrappers of the aerosol-generating article include a first wrapper and a second wrapper.

[0102] The first wrapper may have a bulk of 0.75 cubic centimeters per gram or greater, 0.80 cubic centimeters per gram or greater, 0.85 cubic centimeters per gram or greater, 0.90 cubic centimeters per gram or greater, 0.93 cubic centimeters per gram or greater, or 0.96 cubic centimeters per gram or greater, or 1.10 cubic centimeters per gram or greater.

[0103] The second wrapper may have a bulk of 0.75 cubic centimeters per gram or greater, 0.80 cubic centimeters per gram or greater, 0.85 cubic centimeters per gram or greater, 0.90 cubic centimeters per gram or greater, 0.93 cubic centimeters per gram or greater, 0.96 cubic centimeters per gram or greater, or 1.10 cubic centimeters per gram or greater.

[0104] The first wrapper may have a bulk of 1.38 cubic centimeters per gram or less, 1.37 cubic centimeters per gram or less, 1.30 cubic centimeters per gram or less, or 1.23 cubic centimeters per gram or less.

[0105] The second wrapper may have a bulk of 1.38 cubic centimeters per gram or less, 1.37 cubic centimeters per gram or less, 1.30 cubic centimeters per gram or less, or 1.23 cubic centimeters per gram or less.

[0106] The first wrapper may have a volume of 0.75 cubic centimeters per gram to 1.42 cubic centimeters per gram, 0.80 cubic centimeters per gram to 1.42 cubic centimeters per gram, 0.85 cubic centimeters per gram to 1.42 cubic centimeters per gram, 0.90 cubic centimeters per gram to 1.42 cubic centimeters per gram, 0.93 cubic centimeters per gram to 1.42 cubic centimeters per gram, and 0.96 cubic centimeters per gram to 1.42 cubic centimeters per gram. 1.42 cubic centimeters per gram, 1.10 cubic centimeters per gram to 1.42 cubic centimeters per gram, 0.75 cubic centimeters per gram to 1.38 cubic centimeters per gram, 0.80 cubic centimeters per gram to 1.38 cubic centimeters per gram, 0.85 cubic centimeters per gram to 1.38 cubic centimeters per gram, 0.90 cubic centimeters per gram to 1.38 cubic centimeters per gram, 0.93 cubic centimeters per gram 1.38 cubic centimeters per gram, 0.96 cubic centimeters per gram to 1.38 cubic centimeters per gram, 1.10 cubic centimeters per gram to 1.38 cubic centimeters per gram, 0.75 cubic centimeters per gram to 1.37 cubic centimeters per gram, 0.80 cubic centimeters per gram to 1.37 cubic centimeters per gram, 0.85 cubic centimeters per gram to 1.37 cubic centimeters per gram, 0.90 cubic centimeters per gram Chimeters ~ 1.37 cubic centimeters per gram, 0.93 cubic centimeters per gram ~ 1.37 cubic centimeters per gram, 0.96 cubic centimeters per gram ~ 1.37 cubic centimeters per gram, 1.10 cubic centimeters per gram ~ 1.37 cubic centimeters per gram, 0.75 cubic centimeters per gram ~ 1.30 cubic centimeters per gram, 0.80 cubic centimeters per gram ~ 1.30 cubic centimeters per gram, 0.85 cubic centimeters to 1.30 cubic centimeters per gram, 0.90 cubic centimeters per gram to 1.30 cubic centimeters per gram, 0.93 cubic centimeters per gram to 1.30 cubic centimeters per gram, 0.96 cubic centimeters per gram to 1.30 cubic centimeters per gram, 1.10 cubic centimeters per gram to 1.30 cubic centimeters per gram, 0.75 cubic centimeters per gram to 1.23 cubic centimeters per gram, 0.8 It may have a bulk of 0 cubic centimeters to 1.23 cubic centimeters per gram, 0.85 cubic centimeters per gram to 1.23 cubic centimeters per gram, 0.90 cubic centimeters per gram to 1.23 cubic centimeters per gram, 0.93 cubic centimeters per gram to 1.23 cubic centimeters per gram, 0.96 cubic centimeters per gram to 1.23 cubic centimeters per gram, or 1.10 cubic centimeters per gram to 1.23 cubic centimeters per gram.

[0107] The second wrapper has a volume of 0.75 cubic centimeters per gram to 1.42 cubic centimeters per gram, 0.80 cubic centimeters per gram to 1.42 cubic centimeters per gram, 0.85 cubic centimeters per gram to 1.42 cubic centimeters per gram, 0.90 cubic centimeters per gram to 1.42 cubic centimeters per gram, 0.93 cubic centimeters per gram to 1.42 cubic centimeters per gram, and 0.96 cubic centimeters per gram to 1.42 cubic centimeters per gram. 1.42 cubic centimeters per gram, 1.10 cubic centimeters per gram to 1.42 cubic centimeters per gram, 0.75 cubic centimeters per gram to 1.38 cubic centimeters per gram, 0.80 cubic centimeters per gram to 1.38 cubic centimeters per gram, 0.85 cubic centimeters per gram to 1.38 cubic centimeters per gram, 0.90 cubic centimeters per gram to 1.38 cubic centimeters per gram, 0.93 cubic centimeters per gram 1.38 cubic centimeters per gram, 0.96 cubic centimeters per gram to 1.38 cubic centimeters per gram, 1.10 cubic centimeters per gram to 1.38 cubic centimeters per gram, 0.75 cubic centimeters per gram to 1.37 cubic centimeters per gram, 0.80 cubic centimeters per gram to 1.37 cubic centimeters per gram, 0.85 cubic centimeters per gram to 1.37 cubic centimeters per gram, 0.90 cubic centimeters per gram Chimeters ~ 1.37 cubic centimeters per gram, 0.93 cubic centimeters per gram ~ 1.37 cubic centimeters per gram, 0.96 cubic centimeters per gram ~ 1.37 cubic centimeters per gram, 1.10 cubic centimeters per gram ~ 1.37 cubic centimeters per gram, 0.75 cubic centimeters per gram ~ 1.30 cubic centimeters per gram, 0.80 cubic centimeters per gram ~ 1.30 cubic centimeters per gram, 0.85 cubic centimeters to 1.30 cubic centimeters per gram, 0.90 cubic centimeters per gram to 1.30 cubic centimeters per gram, 0.93 cubic centimeters per gram to 1.30 cubic centimeters per gram, 0.96 cubic centimeters per gram to 1.30 cubic centimeters per gram, 1.10 cubic centimeters per gram to 1.30 cubic centimeters per gram, 0.75 cubic centimeters per gram to 1.23 cubic centimeters per gram, 0.8 It may have a bulk of 0 cubic centimeters to 1.23 cubic centimeters per gram, 0.85 cubic centimeters per gram to 1.23 cubic centimeters per gram, 0.90 cubic centimeters per gram to 1.23 cubic centimeters per gram, 0.93 cubic centimeters per gram to 1.23 cubic centimeters per gram, 0.96 cubic centimeters per gram to 1.23 cubic centimeters per gram, or 1.10 cubic centimeters per gram to 1.23 cubic centimeters per gram.

[0108] The first wrapper may have a thickness of 36 micrometers or greater, 40 micrometers or greater, 41 micrometers or greater, 45 micrometers or greater, 46 micrometers or greater, 50 micrometers or greater, 60 micrometers or greater, 70 micrometers or greater, or 80 micrometers or greater.

[0109] The second wrapper may have a thickness of 36 micrometers or greater, 40 micrometers or greater, 41 micrometers or greater, 45 micrometers or greater, 46 micrometers or greater, 50 micrometers or greater, 60 micrometers or greater, 70 micrometers or greater, or 80 micrometers or greater.

[0110] The first wrapper may have a thickness of 90 micrometers or less, 80 micrometers or less, 70 micrometers or less, 60 micrometers or less, 55 micrometers or less, 50 micrometers or less, 46 micrometers or less, 45 micrometers or less, 41 micrometers or less, or 40 micrometers or less.

[0111] The second wrapper may have a thickness of 90 micrometers or less, 80 micrometers or less, 70 micrometers or less, 60 micrometers or less, 55 micrometers or less, 50 micrometers or less, 46 micrometers or less, 45 micrometers or less, 41 micrometers or less, or 40 micrometers or less.

[0112] The first wrapper may be 36 micrometers to 90 micrometers, 36 micrometers to 80 micrometers, 36 micrometers to 70 micrometers, 36 micrometers to 60 micrometers, 36 micrometers to 55 micrometers, 36 micrometers to 50 micrometers, 36 micrometers to 46 micrometers, 36 micrometers to 45 micrometers, 36 micrometers to 41 micrometers, 36 micrometers to 40 micrometers, 40 micrometers to 90 micrometers, 40 micrometers to 80 micrometers, 40 micrometers to 70 micrometers, 40 micrometers to 60 micrometers, 40 micrometers to 55 micrometers, 40 micrometers to 50 micrometers, 40 micrometers to 46 micrometers, 40 micrometers to 45 micrometers, 40 micrometers to 41 micrometers, 41 micrometers to 90 micrometers, 41 micrometers to 80 micrometers, 41 micrometers to 70 micrometers, 41 micrometers to 41 micrometers micrometers to 60 micrometers, 41 micrometers to 55 micrometers, 41 micrometers to 50 micrometers, 41 micrometers to 46 micrometers, 41 micrometers to 45 micrometers, 45 micrometers to 90 micrometers, 45 micrometers to 80 micrometers, 45 micrometers to 70 micrometers, 45 micrometers to 60 micrometers, 45 micrometers to 55 micrometers, 45 micrometers to 50 micrometers, 45 micrometers to 46 micrometers, 46 micrometers to 90 micrometers, 46 micrometers to 80 micrometers, 46 micrometers to 70 micrometers, 46 micrometers to 60 micrometers, 46 micrometers to 55 micrometers, 46 micrometers to 50 micrometers, 50 micrometers to 90 micrometers, 50 micrometers to 80 micrometers, 50 micrometers to 70 micrometers, 50 micrometers to 60 micrometers, 50 micrometers to 55 micrometers,It may have a thickness of 60 micrometers to 90 micrometers, 60 micrometers to 80 micrometers, 60 micrometers to 70 micrometers, 70 micrometers to 90 micrometers, 70 micrometers to 80 micrometers, or 80 micrometers to 90 micrometers.

[0113] The second wrapper is 36 micrometers to 90 micrometers, 36 micrometers to 80 micrometers, 36 micrometers to 70 micrometers, 36 micrometers to 60 micrometers, 36 micrometers to 55 micrometers, 36 micrometers to 50 micrometers, 36 micrometers to 46 micrometers, 36 micrometers to 45 micrometers, 36 micrometers to 41 micrometers, 36 micrometers to 40 micrometers, 40 micrometers to 90 micrometers, 40 micrometers to 80 micrometers, 40 micrometers to 70 micrometers, 40 micrometers to 60 micrometers, 40 micrometers to 55 micrometers, 40 micrometers to 50 micrometers, 40 micrometers to 46 micrometers, 40 micrometers to 45 micrometers, 40 micrometers to 41 micrometers, 41 micrometers to 90 micrometers, 41 micrometers to 80 micrometers, 41 micrometers to 70 micrometers, 41 micrometers to 41 micrometers micrometers to 60 micrometers, 41 micrometers to 55 micrometers, 41 micrometers to 50 micrometers, 41 micrometers to 46 micrometers, 41 micrometers to 45 micrometers, 45 micrometers to 90 micrometers, 45 micrometers to 80 micrometers, 45 micrometers to 70 micrometers, 45 micrometers to 60 micrometers, 45 micrometers to 55 micrometers, 45 micrometers to 50 micrometers, 45 micrometers to 46 micrometers, 46 micrometers to 90 micrometers, 46 micrometers to 80 micrometers, 46 micrometers to 70 micrometers, 46 micrometers to 60 micrometers, 46 micrometers to 55 micrometers, 46 micrometers to 50 micrometers, 50 micrometers to 90 micrometers, 50 micrometers to 80 micrometers, 50 micrometers to 70 micrometers, 50 micrometers to 60 micrometers, 50 micrometers to 55 micrometers,It may have a thickness of 60 micrometers to 90 micrometers, 60 micrometers to 80 micrometers, 60 micrometers to 70 micrometers, 70 micrometers to 90 micrometers, 70 micrometers to 80 micrometers, or 80 micrometers to 90 micrometers.

[0114] The ratio of the thickness of the first wrapper to the width of the rod of the aerosol-generating substrate may be between 1:225 and 1:70, between 1:220 and 1:90, between 1:200 and 1:110, or between 1:180 and 1:130.

[0115] The ratio of the thickness of the second wrapper to the width of the rod of the aerosol-generating substrate may be 1:225 to 1:70, 1:220 to 1:90, 1:200 to 1:110, or 1:180 to 1:130.

[0116] The first wrapper and the second wrapper may each have a uniform thickness, and the thickness of the first wrapper and the second wrapper may differ at any point by no more than 10 micrometers, no more than 5 micrometers, no more than 2 micrometers, no more than 1 micrometer, or no more than 0.5 micrometers.

[0117] The first wrapper may have a basis weight of 33.5 grams per square meter or greater, 36.5 grams per square meter or greater, 38.5 grams per square meter or greater, 39.0 grams per square meter or greater, 50 grams per square meter or greater, or 60 grams per square meter or greater.

[0118] The second wrapper may have a basis weight of 33.5 grams per square meter or greater, 36.5 grams per square meter or greater, 38.5 grams per square meter or greater, 39.0 grams per square meter or greater, 50 grams per square meter or greater, or 60 grams per square meter or greater.

[0119] The first wrapper may have a basis weight of 70 grams per square meter or less, 60 grams per square meter or less, 50 grams per square meter or less, 42 grams per square meter or less, 41.5 grams per square meter or less, 38.5 grams per square meter or less, or 36.5 grams per square meter or less.

[0120] The second wrapper may have a basis weight of 70 grams per square meter or less, 60 grams per square meter or less, 50 grams per square meter or less, 42 grams per square meter or less, 41.5 grams per square meter or less, 38.5 grams per square meter or less, or 36.5 grams per square meter or less.

[0121] The first wrapper may be 33.5 grams per square meter to 70 grams per square meter, 33.5 grams per square meter to 60 grams per square meter, 33.5 grams per square meter to 50 grams per square meter, 33.5 grams per square meter to 42 grams per square meter, 33.5 grams per square meter to 41.5 grams per square meter, 33.5 grams per square meter to 38.5 grams per square meter, 33.5 grams per square meter to 41.5 grams per square meter, 33.5 grams per square meter to 42 ... 33.5 grams per square meter to 36.5 grams per square meter, 36.5 grams per square meter to 70 grams per square meter, 36.5 grams per square meter to 60 grams per square meter, 36.5 grams per square meter to 50 grams per square meter, 36.5 grams per square meter to 42 grams per square meter, 36.5 grams per square meter to 41.5 grams per square meter, 36.5 grams per square meter to 50 grams per square meter 38.5 grams per square meter, 38.5 grams per square meter to 70 grams per square meter, 38.5 grams per square meter to 60 grams per square meter, 38.5 grams per square meter to 50 grams per square meter, 38.5 grams per square meter to 42 grams per square meter, 38.5 grams per square meter to 41.5 grams per square meter, 39 grams per square meter to 70 grams per square meter, 3 It may have a basis weight of 9 grams per square meter to 60 grams per square meter, 39 grams per square meter to 50 grams per square meter, 39 grams per square meter to 42 grams per square meter, 39 grams per square meter to 41.5 grams per square meter, 50 grams per square meter to 70 grams per square meter, 50 grams per square meter to 60 grams per square meter, or 60 grams per square meter to 70 grams per square meter.

[0122] Preferably, the first wrapper has a basis weight of about 60 grams per square meter. More preferably, the first wrapper has a basis weight of about 36 grams per square meter.

[0123] The second wrapper is 33.5 grams per square meter to 70 grams per square meter, 33.5 grams per square meter to 60 grams per square meter, 33.5 grams per square meter to 50 grams per square meter, 33.5 grams per square meter to 42 grams per square meter, 33.5 grams per square meter to 41.5 grams per square meter, 33.5 grams per square meter to 38.5 grams per square meter, 33.5 grams per square meter to 41.5 grams per square meter, 33.5 grams per square meter to 42 ... 33.5 grams per square meter to 36.5 grams per square meter, 36.5 grams per square meter to 70 grams per square meter, 36.5 grams per square meter to 60 grams per square meter, 36.5 grams per square meter to 50 grams per square meter, 36.5 grams per square meter to 42 grams per square meter, 36.5 grams per square meter to 41.5 grams per square meter, 36.5 grams per square meter to 50 grams per square meter 38.5 grams per square meter, 38.5 grams per square meter to 70 grams per square meter, 38.5 grams per square meter to 60 grams per square meter, 38.5 grams per square meter to 50 grams per square meter, 38.5 grams per square meter to 42 grams per square meter, 38.5 grams per square meter to 41.5 grams per square meter, 39 grams per square meter to 70 grams per square meter, 3 It may have a basis weight of 9 grams per square meter to 60 grams per square meter, 39 grams per square meter to 50 grams per square meter, 39 grams per square meter to 42 grams per square meter, 39 grams per square meter to 41.5 grams per square meter, 50 grams per square meter to 70 grams per square meter, 50 grams per square meter to 60 grams per square meter, or 60 grams per square meter to 70 grams per square meter.

[0124] Preferably, the second wrapper has a basis weight of about 60 grams per square meter. More preferably, the second wrapper has a basis weight of about 39 grams per square meter.

[0125] An aerosol-generating article may have an article length, which is defined as the overall length of the article along the longitudinal axis of the aerosol-generating article from its downstream end to its upstream end.

[0126] The article length may be 30 millimeters or more, 35 millimeters or more, 40 millimeters or more, or 45 millimeters or more.

[0127] The article length may be 80 millimeters or less, 70 millimeters or less, 60 millimeters or less, or 50 millimeters or less.

[0128] The article length may be between 30 mm and 80 mm, between 35 mm and 70 mm, between 40 mm and 60 mm, between 45 mm and 60 mm, between 40 mm and 50 mm, between 45 mm and 50 mm, or about 45 mm.

[0129] The cross-sectional shape of the article may be approximately constant along the length of the article. The cross-sectional shape of the article may be substantially circular. The article may have a width perpendicular to the length of the article, the width being substantially constant along the entire length of the article.

[0130] The aerosol-generating article may have a width of 5 millimeters or more, 5.5 millimeters or more, 6 millimeters or more, 6.5 millimeters or more, or 7 millimeters or more.

[0131] The aerosol-generating article may have a width of 10 millimeters or less, 9 millimeters or less, 8 millimeters or less, or 7.5 millimeters or less.

[0132] The aerosol-generating article may have a width of 3 mm to 10 mm, 4 mm to 9 mm, 5 mm to 8 mm, 5 mm to 7.5 mm, 5.5 mm to 8 mm, 5.5 mm to 7.5 mm, 6 mm to 8 mm, 6 mm to 7.5 mm, 6.5 mm to 8 mm, 6.5 mm to 7.5 mm, 7 mm to 8 mm, or 7 mm to 7.5 mm.

[0133] The resistance to draw (RTD) of the aerosol-generating article may be between 10 millimeters of water column and 70 millimeters of water column, between 20 millimeters of water column and 65 millimeters of water column, between 30 millimeters of water column and 60 millimeters of water column, between 35 millimeters of water column and 55 millimeters of water column, or between 40 millimeters of water column and 50 millimeters of water column.

[0134] Unless otherwise specified, the resistance to draw (RTD) of a component or aerosol-generating article is measured in accordance with ISO Standard 6565-2015. RTD refers to the pressure required to force air through the entire length of the component. The terms "pressure drop" or "draw resistance" of a component or article may also refer to "resistance to draw." Such terms generally refer to measurements in accordance with ISO Standard 6565-2015 normally performed at a temperature of 22 degrees Celsius, a pressure of 101 kPa (approximately 760 Torr), and 60% relative humidity, with a volumetric flow rate of 17.5 milliliters per second at the output or downstream end of the measured component. Smoking conditions and smoking machine specifications are provided in ISO Standard 3308 (ISO 3308:2012). Conditioning and testing atmospheres are provided in ISO Standard 3402 (ISO 3402:1999).

[0135] The resistance to withdrawal (RTD) may be expressed in units of pressure "millimeters of water column" (mmWG).

[0136] The first wrapper and the second wrapper may each form at least a portion of the outer surface of the article, or in other words, the outer surface of the article may be at least partially defined by the first wrapper and the second wrapper.

[0137] At least a portion of each of the first wrapper and the second wrapper can be the radially outermost layer of the article, in other words, at least a portion of each of the first wrapper and the second wrapper is not covered by an additional layer.

[0138] The first wrapper may have a first wrapper length along the longitudinal axis of the aerosol-generating article, which may be measured from an upstream end of the first wrapper to a downstream end of the first wrapper.

[0139] The second wrapper may have a second wrapper length along the longitudinal axis of the aerosol-generating article. The second wrapper length may be measured from the upstream end of the second wrapper to the downstream end of the second wrapper. As noted above, the aerosol-generating article may have an article length along the longitudinal axis of the aerosol-generating article.

[0140] The second wrapper length may be equal to or greater than the first wrapper length. Preferably, the first wrapper length is equal to or greater than the second wrapper length.

[0141] One or both of the first wrapper length and the second wrapper length may each be less than the article length.

[0142] The first wrapper length may be 30 percent or more of the article length, 40 percent or more of the article length, 50 percent or more of the article length, 60 percent or more of the article length, 70 percent or more of the article length, 80 percent or more of the article length, or 90 percent or more of the article length.

[0143] The second wrapper length may be 30 percent or more of the article length, 40 percent or more of the article length, 50 percent or more of the article length, 60 percent or more of the article length, 70 percent or more of the article length, 80 percent or more of the article length, or 90 percent or more of the article length.

[0144] One of the first wrapper length and the second wrapper length may be substantially the same as the article length, i.e., one of the first wrapper and the second wrapper may extend along the entire length of the aerosol-generating article in a direction along the longitudinal axis of the aerosol-generating article.

[0145] The first wrapper length may be 95 percent or less of the article length, 90 percent or less of the article length, 80 percent or less of the article length, 70 percent or less of the article length, 60 percent or less of the article length, 50 percent or less of the article length, or 40 percent or less of the article length.

[0146] The second wrapper length may be 95 percent or less of the article length, 90 percent or less of the article length, 80 percent or less of the article length, 70 percent or less of the article length, 60 percent or less of the article length, 50 percent or less of the article length, or 40 percent or less of the article length.

[0147] The first wrapper length is 30% to 95% of the article length, 30% to 90% of the article length, 30% to 80% of the article length, 30% to 70% of the article length, 30% to 60% of the article length, 30% to 50% of the article length, 30% to 40% of the article length, 40% to 95% of the article length, 40% to 90% of the article length, 40% to 80% of the article length, 40% to 70% of the article length, 40% to 60% of the article length, 40% to 50% of the article length, 50% to 95% of the article length. The length may be 50 to 90 percent of the article length, 50 to 80 percent of the article length, 50 to 70 percent of the article length, 50 to 60 percent of the article length, 60 to 95 percent of the article length, 60 to 90 percent of the article length, 60 to 80 percent of the article length, 60 to 70 percent of the article length, 70 to 95 percent of the article length, 70 to 90 percent of the article length, 70 to 80 percent of the article length, 80 to 90 percent of the article length, or 90 to 95 percent of the article length.

[0148] The second wrapper length is 30% to 95% of the article length, 30% to 90% of the article length, 30% to 80% of the article length, 30% to 70% of the article length, 30% to 60% of the article length, 30% to 50% of the article length, 30% to 40% of the article length, 40% to 95% of the article length, 40% to 90% of the article length, 40% to 80% of the article length, 40% to 70% of the article length, 40% to 60% of the article length, 40% to 50% of the article length, 50% to 95% of the article length. The length may be 50 to 90 percent of the article length, 50 to 80 percent of the article length, 50 to 70 percent of the article length, 50 to 60 percent of the article length, 60 to 95 percent of the article length, 60 to 90 percent of the article length, 60 to 80 percent of the article length, 60 to 70 percent of the article length, 70 to 95 percent of the article length, 70 to 90 percent of the article length, 70 to 80 percent of the article length, 80 to 90 percent of the article length, or 90 to 95 percent of the article length.

[0149] The first wrapper length can be 10 millimeters or more, 20 millimeters or more, 25 millimeters or more, 30 millimeters or more, or 40 millimeters or more.

[0150] The first wrapper length can be 50 millimeters or less, 40 millimeters or less, 30 millimeters or less, 25 millimeters or less, or 20 millimeters or less.

[0151] The first wrapper length can be 10 mm to 50 mm, 10 mm to 40 mm, 10 mm to 30 mm, 10 mm to 25 mm, 10 mm to 20 mm, 20 mm to 50 mm, 20 mm to 40 mm, 20 mm to 30 mm, 20 mm to 25 mm, 25 mm to 50 mm, 25 mm to 40 mm, 25 mm to 30 mm, 30 mm to 50 mm, 30 mm to 40 mm, or 40 mm to 50 mm.

[0152] The second wrapper length can be 10 millimeters or more, 20 millimeters or more, 25 millimeters or more, 30 millimeters or more, or 40 millimeters or more.

[0153] The second wrapper length can be 50 millimeters or less, 40 millimeters or less, 30 millimeters or less, 25 millimeters or less, or 20 millimeters or less.

[0154] The second wrapper length can be 10 mm to 50 mm, 10 mm to 40 mm, 10 mm to 30 mm, 10 mm to 25 mm, 10 mm to 20 mm, 20 mm to 50 mm, 20 mm to 40 mm, 20 mm to 30 mm, 20 mm to 25 mm, 25 mm to 50 mm, 25 mm to 40 mm, 25 mm to 30 mm, 30 mm to 50 mm, 30 mm to 40 mm, or 40 mm to 50 mm.

[0155] One or both of the first wrapper and the second wrapper may extend from an upstream end of the article. One or both of the first wrapper and the second wrapper may extend from a downstream end of the article.

[0156] For example, a first wrapper may extend from an upstream end of the article and a second wrapper may extend from a downstream end of the article.

[0157] The downstream end of the first wrapper may be downstream of the downstream end of the second wrapper. Preferably, the downstream end of the second wrapper is downstream of the downstream end of the first wrapper.

[0158] The upstream end of the second wrapper may be upstream of the upstream end of the first wrapper. Preferably, the upstream end of the first wrapper is upstream of the upstream end of the second wrapper.

[0159] Preferably, each of the first wrapper and the second wrapper does not extend beyond the ends of the aerosol-generating article in a direction parallel to the longitudinal axis.

[0160] One or both of the first wrapper and the second wrapper may be in direct physical contact with at least one of the rod and the downstream section of the aerosol-generating substrate, in which case there is no layer of material between the one or both of the first wrapper and the second wrapper and at least one of the rod and the downstream section of the aerosol-generating substrate.

[0161] Each of the first wrapper and the second wrapper may be formed from a single continuous sheet of material. Each of the single continuous sheets may be wrapped about one turn around at least one of the rod and downstream section of the aerosol-generating substrate. Generally, each of the single continuous sheets may be wrapped slightly more than one turn but less than two turns around at least one of the rod and downstream section of the aerosol-generating substrate to form the overlapping regions of the opposing end portions of each wrapper. The thickness of each wrapper is not measured in the overlapping regions of the opposing end portions of each wrapper. Each of the first wrapper and the second wrapper may be formed from a single continuous sheet of material and may comprise only a single layer, excluding the optional overlapping regions of the opposing end portions of each wrapper, if present.

[0162] One or both of the first wrapper and the second wrapper may comprise a cellulosic material, preferably selected from one or more of paper, wood, textiles, natural fibers, and man-made fibers. One or both of the first wrapper and the second wrapper may each comprise a paper layer. One or both of the first wrapper and the second wrapper may each be made from a single paper sheet.

[0163] One or both of the first wrapper and the second wrapper may each comprise a single paper layer wrapped around at least one of the rod and the downstream section of the aerosol-generating substrate.

[0164] One or both of the first wrapper and the second wrapper may be a paper wrapper or a non-paper wrapper. Suitable non-paper wrappers include, but are not limited to, a sheet of homogenized tobacco material.

[0165] Both the first wrapper and the second wrapper are preferably each formed from paper.

[0166] One or both of the first wrapper and the second wrapper may be a paper wrapper comprising PVOH (polyvinyl alcohol) or silicon (or polysiloxane). The PVOH may be applied to the paper wrapper as a surface coating, or the paper wrapper may include a surface treatment comprising PVOH or silicon.

[0167] Advantageously, a PVOH (polyvinyl alcohol) or silicon (or polysiloxane) surface coating or treatment may improve the grease barrier properties of the wrapper.

[0168] One or both of the first wrapper and the second wrapper may include a water-resistant barrier coating on at least a portion of an inner surface. The water-resistant barrier coating may include one or both of alkylketene dimer (AKD) and rosin. The water-resistant barrier coating components may be mixed with the fibers of the wrapper during the manufacturing process. The wrapper may be impregnated with the water-resistant barrier coating components.

[0169] Advantageously, providing a water-resistant barrier coating on at least a portion of the inner surface of one or both of the first and second wrappers may increase the wet tensile strength of the wrappers. Without wishing to be bound by theory, providing a water-resistant barrier coating on at least a portion of the inner surface of one or both of the first and second wrappers may increase the contact angle of the inner surface of the wrappers, which in turn may increase the hydrophobicity and wet tensile strength of the wrappers.

[0170] The basis weight of the first wrapper may be equal to the basis weight of the second wrapper. The basis weight of the first wrapper may be greater than the basis weight of the second wrapper. Preferably, the basis weight of the second wrapper is greater than the basis weight of the first wrapper.

[0171] The thickness of the first wrapper may be equal to the thickness of the second wrapper, or may be greater than the thickness of the second wrapper, and preferably the thickness of the second wrapper is greater than the thickness of the first wrapper.

[0172] One or both of the first wrapper and the second wrapper may include an element printed on at least one of the outer or inner surfaces of the wrapper. Only one of the first wrapper and the second wrapper may include an element printed on at least one of the outer or inner surfaces of the wrapper. Preferably, only the second wrapper includes an element printed on at least one of the outer or inner surfaces of the wrapper.

[0173] The printed element may include at least one of indicia, text, images, characters, phrases, shapes, logos, colors, graphics, patterns, coatings (such as lip release coatings), or combinations thereof.

[0174] One or both of the first wrapper and the second wrapper may comprise a filler. The filler content of one or both of the first wrapper and the second wrapper may be 30 percent or less by weight of the wrapper. Preferably, the filler is calcium carbonate.

[0175] One or both of the first wrapper and the second wrapper may include one or more perforations, or may not include any perforations. Perforations through the wrapper may be achieved, for example, through laser drilling.

[0176] The first wrapper may have a permeability of 10 Coresta units or less, 7 Coresta units or less, 5 Coresta units or less, or 3 Coresta units or less.

[0177] The first wrapper may have a permeability of 1 Coresta unit or more, 3 Coresta units or more, 5 Coresta units or more, or 7 Coresta units or more.

[0178] The second wrapper may have a permeability of 10 Coresta units or less, 7 Coresta units or less, 5 Coresta units or less, or 3 Coresta units or less.

[0179] The second wrapper may have a permeability of 1 Coresta unit or more, 3 Coresta units or more, 5 Coresta units or more, or 7 Coresta units or more.

[0180] The permeability of the wrapper may be determined in accordance with the international standard test method ISO 2965:2019, and the results may be presented as cubic centimeters per minute per square centimeter, and may be referred to as "Cholesta units."

[0181] The surfaces of each of the first and second wrappers may include a wire side and a non-wire side opposite the wire side. The wire side of the wrapper is the side of the wrapper formed in contact with the forming wire of the manufacturing machine. The wire side of each of the first and second wrappers may face inward. The non-wire side of each of the first and second wrappers may face outward.

[0182] The wire side of the first wrapper may have a contact angle that is greater than the contact angle of its non-wire side.

[0183] The side of the first wrapper with the smallest contact angle preferably faces outward.

[0184] The wire side of the second wrapper may have a contact angle that is greater than the contact angle of its non-wire side.

[0185] The side of the second wrapper with the smallest contact angle preferably faces outward.

[0186] Advantageously, providing the lowest contact angle to the wrapper on its outer surface improves the ease with which printed elements can be provided on the outer surface of the wrapper.

[0187] The non-wire side of the second wrapper may have a contact angle that is equal to or greater than the contact angle of the non-wire side of the first wrapper. Preferably, the non-wire side of the first wrapper has a contact angle that is equal to or greater than the contact angle of the non-wire side of the second wrapper.

[0188] The wire side of the second wrapper may have a contact angle that is equal to or greater than the contact angle of the wire side of the first wrapper. Preferably, the wire side of the first wrapper has a contact angle that is equal to or greater than the contact angle of the wire side of the second wrapper.

[0189] Advantageously, providing a smaller contact angle on a surface relative to the wrapper makes it easier to apply printed elements to that surface.

[0190] For example, providing a second wrapper with a lower contact angle on its surface than a first wrapper may allow the second wrapper to be more easily provided with printed elements on its surface than the first wrapper, which may allow, for example, providing the second wrapper with printed elements and providing the first wrapper without printed elements while minimizing the cost of the first wrapper.

[0191] At least one of the first wrapper and the second wrapper may have a hydrophobic surface, i.e., at least one of the first wrapper and the second wrapper may have a high contact angle on the surface.

[0192] The term "hydrophobicity" refers to a surface that exhibits water-repellent properties. One way to determine this is by measuring the water contact angle, referred to herein simply as the "contact angle." The "contact angle" is the angle traditionally measured through a liquid where the liquid / vapor interface meets the solid surface. It quantifies the wettability of a solid surface by a liquid via Young's equation. Hydrophobicity or water contact angle may be determined by utilizing the TAPPI T558 test method, and results are expressed as interfacial contact angles, reported in degrees, which can range from near zero to near 180 degrees. Contact angles may also be measured in accordance with EN 828:2013.

[0193] At least one side of the first wrapper (e.g., one or both of the non-wire side and the wire side) may have a contact angle of 45 degrees or greater, 50 degrees or greater, 60 degrees or greater, 65 degrees or greater, or 75 degrees or greater.

[0194] At least one side of the second wrapper (e.g., one or both of the non-wire side and the wire side) may have a contact angle of 45 degrees or greater, 50 degrees or greater, 60 degrees or greater, 65 degrees or greater, or 75 degrees or greater.

[0195] At least one side of the first wrapper (eg, one or both of the non-wire side and the wire side) may have a contact angle of 75 degrees or less, 65 degrees or less, or 60 degrees or less.

[0196] At least one side of the second wrapper (eg, one or both of the non-wire side and the wire side) may have a contact angle of 75 degrees or less, 65 degrees or less, or 60 degrees or less.

[0197] At least one side of the first wrapper (e.g., one or both of the non-wire side and the wire side) may have a contact angle of 45 degrees to 75 degrees, 45 degrees to 65 degrees, 45 degrees to 60 degrees, 50 degrees to 75 degrees, 50 degrees to 65 degrees, 50 degrees to 60 degrees, 60 degrees to 75 degrees, 60 degrees to 65 degrees, or 65 degrees to 75 degrees.

[0198] At least one side of the second wrapper (e.g., one or both of the non-wire side and the wire side) may have a contact angle of 45 degrees to 75 degrees, 45 degrees to 65 degrees, 45 degrees to 60 degrees, 50 degrees to 75 degrees, 50 degrees to 65 degrees, 50 degrees to 60 degrees, 60 degrees to 75 degrees, 60 degrees to 65 degrees, or 65 degrees to 75 degrees.

[0199] One or both of the first wrapper and the second wrapper may or may not be embossed.

[0200] The term "embossment" is used herein to refer to protrusions formed on the surface of a wrapper. These protrusions may be engraved, molded, or stamped into the wrapper. A portion of a wrapper with such embossment is said to be embossed.

[0201] One or both of the first wrapper and the second wrapper may have a side (e.g., their non-wire side) smoothness (Beck smoothness number) of 30 Bekk seconds to 450 Bekk seconds, 100 Bekk seconds to 200 Bekk seconds, or 130 Bekk seconds to 170 Bekk seconds.

[0202] One or both of the first wrapper and the second wrapper may have a side (e.g., their wire side) smoothness (Beck smoothness number) of 60 Bekk seconds to 140 Bekk seconds, 80 Bekk seconds to 120 Bekk seconds, or 90 Bekk seconds to 110 Bekk seconds.

[0203] Advantageously, providing a wrapper with a greater surface smoothness (greater Bekk smoothness number) makes it easier to apply printed elements to that surface.

[0204] Preferably, the side or sides of the first wrapper and second wrapper having the greatest smoothness face outward.

[0205] Advantageously, providing the wrapper with the greatest smoothness on its outer surface improves the ease with which printed elements can be provided on the outer surface of the wrapper.

[0206] Smoothness, expressed in Beck seconds (Beck smoothness number), can be measured by a standard test using a BEKK Smoothness Tester, which generates a vacuum and measures the time it takes for the vacuum to drop from 50.66 kPa to 48.00 kPa. This test is recognized by ISO standard 5627:1995.

[0207] One or both of the first wrapper and the second wrapper may have a Cobb value on at least one side (e.g., one or both of the wire side and the non-wire side) that is 30 grams per square meter or less, 28 grams per square meter or less, 26 grams per square meter or less, 24 grams per square meter or less, or 22 grams per square meter or less.

[0208] One or both of the first wrapper and the second wrapper may have a Cobb value on at least one side (e.g., one or both of the wire side and the non-wire side) that is 15 grams per square meter or greater, 20 grams per square meter or greater, 22 grams per square meter or greater, 24 grams per square meter or greater, 26 grams per square meter or greater, or 28 grams per square meter or greater.

[0209] One or both of the first wrapper and the second wrapper may have a Cobb value on at least one side (e.g., one or both of the wire side and the non-wire side) that is between 15 grams per square meter and 30 grams per square meter, between 20 grams per square meter and 30 grams per square meter, between 22 grams per square meter and 28 grams per square meter, or between 24 grams per square meter and 26 grams per square meter.

[0210] As used herein, the term "Cobb value" refers to "Cobb 60," which is a measurement of the amount of water a defined area of ​​paper absorbs through one-sided contact with water within 60 seconds. Cobb value may be measured in accordance with ISO 535:2014.

[0211] Advantageously, reducing the Cobb value of the wrapper reduces the absorption of water into the wrapper, which may increase the wet tensile strength of the wrapper.

[0212] The first wrapper and the second wrapper may overlap each other. The first wrapper may at least partially overlie the second wrapper. Preferably, the second wrapper at least partially overlies the first wrapper.

[0213] The overlapping region of the first and second wrappers may have a length in a direction parallel to the longitudinal axis of the article.

[0214] The overlapping length of the first wrapper and the second wrapper in a direction parallel to the longitudinal axis of the article may be equal to the length of one or more of the hollow tubular elements.

[0215] The overlap length of the first wrapper and the second wrapper in a direction parallel to the longitudinal axis of the article may be 5 millimeters or more, 10 millimeters or more, 15 millimeters or more, or 20 millimeters or more.

[0216] The overlap length of the first wrapper and the second wrapper in a direction parallel to the longitudinal axis of the article may be 25 millimeters or less, 20 millimeters or less, 15 millimeters or less, or 10 millimeters or less.

[0217] The overlap length of the first wrapper and the second wrapper in a direction parallel to the longitudinal axis of the article may be 5 millimeters to 25 millimeters, 5 millimeters to 20 millimeters, 5 millimeters to 10 millimeters, 10 millimeters to 15 millimeters, or 15 millimeters to 20 millimeters.

[0218] The overlap length between the first wrapper and the second wrapper may be equal to the length of the first wrapper or equal to the length of the second wrapper. In some preferred embodiments, the overlap length between the first wrapper and the second wrapper is equal to the length of the second wrapper. In some preferred embodiments, the first wrapper is completely underneath the second wrapper.

[0219] The aerosol-generating article comprises a downstream section located downstream of the rod of aerosol-generating substrate.

[0220] The downstream section is preferably located immediately downstream of the rod of the aerosol-generating substrate.

[0221] The downstream section preferably extends between the rod of the aerosol-generating substrate and the downstream end of the aerosol-generating article, in other words, the downstream end of the aerosol-generating article may coincide with the downstream end of the downstream section.

[0222] The downstream section may have a length of 10 millimeters or more, 20 millimeters or more, 25 millimeters or more, 30 millimeters or more, or 40 millimeters or more.

[0223] The downstream section may have a length of 70 millimeters or less, 60 millimeters or less, 50 millimeters or less, 40 millimeters or less, 30 millimeters or less, 25 millimeters or less, or 20 millimeters or less.

[0224] The downstream section may have a length of 10 mm to 70 mm, 10 mm to 60 mm, 10 mm to 50 mm, 10 mm to 40 mm, 10 mm to 30 mm, 10 mm to 25 mm, 10 mm to 20 mm, 20 mm to 70 mm, 20 mm to 60 mm, 20 mm to 50 mm, 20 mm to 40 mm, 20 mm to 30 mm, 20 mm to 25 mm, 25 mm to 70 mm, 25 mm to 60 mm, 25 mm to 50 mm, 25 mm to 40 mm, 25 mm to 30 mm, 30 mm to 70 mm, 30 mm to 60 mm, 30 mm to 50 mm, 30 mm to 40 mm, 40 mm to 70 mm, 40 mm to 60 mm, or 40 mm to 50 mm.

[0225] The resistance to drawing (RTD) of the downstream section may be 0 millimeters of water column or more, 1 millimeter of water column or more, 2 millimeters of water column or more, 5 millimeters of water column or more, 10 millimeters of water column or more, 16 millimeters of water column or more, or 17 millimeters of water column or more.

[0226] The resistance to drawing (RTD) of the downstream section may be 100 millimeters of water column or less, 50 millimeters of water column or less, 40 millimeters of water column or less, 30 millimeters of water column or less, 20 millimeters of water column or less, or 19 millimeters of water column or less.

[0227] The resistance to drawing (RTD) of the downstream section may be between 1 mm and 100 mm of water column, between 2 mm and 50 mm of water column, between 5 mm and 40 mm of water column, between 10 mm and 30 mm of water column, between 16 mm and 20 mm of water column, between 17 mm and 19 mm of water column, or about 18 mm of water column.

[0228] The downstream section comprises one or more hollow tubular elements.

[0229] The downstream section may comprise a single hollow tubular element, in other words, the downstream section may comprise only one hollow tubular element, or alternatively, the downstream section may comprise two or more hollow tubular elements.

[0230] One of the one or more hollow tubular elements of the downstream section may be provided immediately downstream of the rod of the aerosol-generating substrate, in other words, one of the one or more hollow tubular elements may abut the downstream end of the rod of the aerosol-generating substrate.

[0231] One of the one or more hollow tubular elements may define an upstream end of the downstream section.

[0232] At least one of the one or more hollow tubular elements may have a wall thickness of 100 micrometers to 2 millimeters, 0.8 millimeters to 1.2 millimeters, 1 millimeter to 2 millimeters, 1.5 millimeters to 2 millimeters, 1.6 millimeters to 2 millimeters, 150 micrometers to 1.5 millimeters, or 200 micrometers to 1.25 millimeters.

[0233] Preferably, at least one of the one or more hollow tubular elements has a width approximately equal to the width of the aerosol-generating article.

[0234] At least one of the one or more hollow tubular elements may have a width between 5 millimeters and 10 millimeters, between 5.5 millimeters and 9 millimeters, or between 6 millimeters and 8 millimeters.

[0235] The one or more hollow tubular elements may have a lumen. The lumen of the one or more hollow tubular elements may have any cross-sectional shape. The lumen of the one or more hollow tubular elements may have a substantially circular cross-sectional shape. The width of the lumen of the hollow tubular element may be referred to as the "internal width." This should be distinguished from the "width" of the hollow tubular element, which, unless otherwise specified, refers to the external width or outer width of the hollow tubular element.

[0236] At least one of the one or more hollow tubular elements may have an internal width of between 2 millimeters and 10 millimeters, between 3 millimeters and 9 millimeters, between 4 millimeters and 8 millimeters, or between 5 millimeters and 7 millimeters.

[0237] At least one of the one or more hollow tubular elements may have a length of 3 millimeters or more, 4 millimeters or more, 5 millimeters or more, 6 millimeters or more, 7 millimeters or more, 10 millimeters or more, 15 millimeters or more, 20 millimeters or more, or 25 millimeters or more.

[0238] At least one of the one or more hollow tubular elements may have a length of 40 millimeters or less, 35 millimeters or less, 30 millimeters or less, 25 millimeters or less, 20 millimeters or less, 15 millimeters or less, 12 millimeters or less, or 10 millimeters or less.

[0239] At least one of the one or more hollow tubular elements may have a length of 5 mm to 40 mm, 5 mm to 30 mm, 5 mm to 25 mm, 5 mm to 20 mm, 5 mm to 15 mm, 5 mm to 10 mm, 10 mm to 40 mm, 10 mm to 30 mm, 10 mm to 25 mm, 10 mm to 20 mm, or 10 mm to 15 mm, 15 mm to 40 mm, 15 mm to 30 mm, 15 mm to 25 mm, 15 mm to 20 mm, 20 mm to 40 mm, 20 mm to 30 mm, 20 mm to 25 mm, 25 mm to 40 mm, or 25 mm to 30 mm.

[0240] At least one of the one or more hollow tubular elements may have a length of 5 mm to 15 mm, 6 mm to 15 mm, 7 mm to 15 mm, 5 mm to 12 mm, 6 mm to 12 mm, 7 mm to 12 mm, 5 mm to 10 mm, 6 mm to 10 mm, or 7 mm to 10 mm.

[0241] The aerosol-generating article may include a ventilation zone.

[0242] The ventilation zone may include one or more ventilation holes. The one or more ventilation holes may be perforations, which may be achieved, for example, through laser drilling. The one or more ventilation holes may be arranged in one or more rows provided circumferentially around the article. Preferably, each circumferential row of holes includes between 8 and 30 holes.

[0243] One or more vents may be provided at a location along the downstream section. One or more vents may be provided at a location along at least one of the one or more hollow tubular elements.

[0244] The one or more vents may be located along the downstream section between 5 millimeters and 25 millimeters from the downstream end of the article, between 10 millimeters and 20 millimeters from the downstream end of the article, or between 12 millimeters and 18 millimeters from the downstream end of the article.

[0245] One or more vent holes may extend through the peripheral wall of one or more hollow tubular elements. In this manner, fluid communication may be established between a flow channel defined internally by one or more hollow tubular elements and the external environment.

[0246] Advantageously, the provision of at least one of the one or more vented hollow tubular elements provides particularly efficient cooling of the aerosol, such rapid cooling of volatile species released upon heating of the aerosol-generating substrate enhancing nucleation of aerosol particles.

[0247] The aerosol-generating article may have a breathability level of 45 percent or greater, 50 percent or greater, 60 percent or greater, or 70 percent or greater.

[0248] The aerosol-generating article may have a breathability level of 90 percent or less, 85 percent or less, 80 percent or less, 70 percent or less, or 60 percent or less.

[0249] As used herein, the term "ventilation level" refers to the volume ratio of the airflow entering the aerosol-generating article through the ventilation zone (ventilation airflow) to the sum of the aerosol airflow and the ventilation airflow. The greater the ventilation level, the greater the dilution of the aerosol stream delivered to the consumer.

[0250] One or more vent holes may be provided through one or both of the first wrapper and the second wrapper.

[0251] In some embodiments, the aerosol-generating article may be an aerosol-generating article that does not include a ventilation zone.

[0252] At least one of the one or more hollow tubular elements may be formed from at least one of cardboard, paper, polymeric material, cellulosic material, cellulose acetate, low-density polyethylene (LDPE), and polyhydroxyalkanoate (PHA). When the hollow tubular element is formed from paper, the paper may be crimped paper, such as crimped heat-resistant paper or crimped parchment paper. Preferably, at least one of the one or more hollow tubular elements comprises cellulose acetate tow. The cellulose acetate tow may have a denier per filament of 2 to 4 and a total denier of 25 to 40. Preferably, at least one of the one or more hollow tubular elements comprises a hollow acetate tube.

[0253] The one or more hollow tubular elements may include a first hollow tubular element and a second hollow tubular element. The first hollow tubular element may be a hollow acetate tube or a cardboard tube. For example, the first hollow tubular element may be a hollow acetate tube (HAT). The second hollow tubular element may be a hollow acetate tube or a cardboard tube. For example, the second hollow tubular element may be a fine hollow acetate tube (FHAT). The inner width of the second hollow tubular element may be greater than the inner width of the first hollow tubular element. The wall thickness of the second hollow tubular element may be smaller than the wall thickness of the first hollow tubular element. For example, the wall thickness of the second hollow tubular element may be 0.8 mm to 1.2 mm, e.g., 1.05 mm. For example, the wall thickness of the second hollow tubular element may be 1.6 mm to 2 mm, e.g., 1.9 mm. The second hollow tubular element may be disposed downstream of the first hollow tubular element. One or both of the first and second hollow tubular elements may include a ventilation zone. Preferably, the second hollow tubular element includes a ventilation zone located along the second hollow tubular element. The first tubular element may have a length of 3 to 13 mm, 6 to 10 mm, 7 to 9 mm, or about 8 mm. The second tubular element may have a length of 4 to 14 mm, 7 to 11 mm, 8 to 10 mm, or about 9 mm.

[0254] The one or more hollow tubular elements may comprise hollow tubular cooling elements.

[0255] As used herein, "hollow tubular cooling element" refers to a component of an aerosol-generating article that is located downstream of the aerosol-generating substrate so that an aerosol formed by volatile compounds emitted from the aerosol-generating substrate during use passes through and is cooled by the hollow tubular cooling element before being inhaled by the consumer.

[0256] The upstream end of the hollow tubular cooling element may abut the downstream end of the rod of the aerosol-generating substrate.

[0257] The hollow tubular cooling element can be a cardboard tube. In some preferred embodiments, the hollow tubular cooling element is a flanged cardboard tube.

[0258] Advantageously, cardboard is a cost-effective material that provides a balance between being deformable to provide ease of insertion of the article into the aerosol generating device, and being sufficiently rigid to provide adequate engagement of the article with the interior of the device. Thus, a cardboard tube may provide adequate resistance to deformation or compression during use.

[0259] The hollow tubular cooling element can be a paper tube. The hollow tubular cooling element can be a tube formed from spirally wound paper. The hollow tubular cooling element can be formed from multiple layers of paper.

[0260] The hollow tubular cooling element may comprise a polymeric material. For example, the hollow tubular cooling element may comprise a polymeric film. The polymeric film may comprise a cellulose film. The hollow tubular cooling element may comprise low density polyethylene (LDPE) or polyhydroxyalkanoate (PHA) fibers. The hollow tubular cooling element may comprise cellulose acetate tow. The cellulose acetate tow may have a denier per filament of 2 to 4 and a total denier of 25 to 40. The hollow tubular cooling element is preferably formed from cellulose acetate. Preferably, the hollow tubular cooling element comprises a hollow acetate tube.

[0261] The one or more hollow tubular elements may comprise a hollow tubular support element, the upstream end of which may abut the downstream end of the rod of the aerosol-generating substrate.

[0262] The one or more hollow tubular elements may comprise a hollow tubular support element upstream of the hollow tubular cooling element, the upstream end of the hollow tubular cooling element may abut the downstream end of the hollow tubular support element.

[0263] The hollow tubular support element may be formed from one or more materials selected from the group consisting of cellulose acetate, cardboard, crimped paper such as crimped heat-resistant paper or crimped parchment paper, and polymeric materials such as low-density polyethylene (LDPE). Preferably, the hollow tubular support element is formed from cellulose acetate. Preferably, the hollow tubular support element comprises a hollow acetate tube.

[0264] The downstream section may further comprise a PLA (polylactic acid) plug. The PLA plug may comprise crimped PLA. The PLA plug may be downstream of one or more hollow tubular elements. The PLA plug may be provided as an alternative to hollow tubular cooling elements.

[0265] The hollow tubular support element may be upstream of the PLA plug, and the upstream end of the PLA plug may abut the downstream end of the hollow tubular support element.

[0266] The PLA plug may have a length of 5 mm to 40 mm, 5 mm to 30 mm, 5 mm to 25 mm, 5 mm to 20 mm, 5 mm to 15 mm, 5 mm to 10 mm, 10 mm to 40 mm, 10 mm to 30 mm, 10 mm to 25 mm, 10 mm to 20 mm, or 10 mm to 15 mm, 15 mm to 40 mm, 15 mm to 30 mm, 15 mm to 25 mm, 15 mm to 20 mm, 20 mm to 40 mm, 20 mm to 30 mm, 20 mm to 25 mm, 25 mm to 40 mm, or 25 mm to 30 mm.

[0267] The one or more hollow tubular elements may comprise one or both of hollow acetate tubing (HAT) or fine hollow acetate tubing (FHAT). Such hollow tubes are cylindrical components that may be made from cellulose acetate and may be provided with a centrally disposed axial hole. The HAT may function as one or more of an airflow cooling element and an airflow accelerating element. The FHAT may function as an airflow decelerating element.

[0268] The one or more hollow tubular elements may include a HAT and a FHAT. The FHAT may be disposed downstream of the HAT. The inner width of the FHAT may be greater than the inner width of the HAT. The wall thickness of the HAT may be greater than the wall thickness of the FHAT. For example, the wall thickness of the HAT may be 0.8 mm to 1.2 mm, e.g., 1.05 mm. For example, the wall thickness of the FHAT may be 1.6 mm to 2 mm, e.g., 1.9 mm.

[0269] The HAT may have a length of 3 mm to 13 mm, 6 mm to 10 mm, 7 mm to 9 mm, or about 8 mm.

[0270] The FHAT may have a length of 4 millimeters to 14 millimeters, 7 millimeters to 11 millimeters, 8 millimeters to 10 millimeters, or about 9 millimeters.

[0271] One or both of the HAT and FHAT may include ventilation zones. The FHAT preferably includes ventilation zones at locations along the FHAT. For example, the FHAT may include 11 ventilation holes, each having a diameter of 0.11 millimeters.

[0272] One or more hollow tubular elements may provide a negligible resistance to withdrawal (RTD), the term "negligible RTD" being used to indicate an RTD of less than 1 millimeter of water column per 10 millimeters of hollow tubular element length, preferably less than 0.4 millimeters of water column per 10 millimeters of hollow tubular element length, and more preferably less than 0.1 millimeters of water column per 10 millimeters of hollow tubular element length.

[0273] Preferably, the RTD of at least one of the one or more hollow tubular elements is 10 mm of water column or less, 5 mm of water column or less, 2.5 mm of water column or less, 2 mm of water column or less, or 1 mm of water column or less.

[0274] At least one RTD of the one or more hollow tubular elements may be 0 millimeters of water column or greater, 0.25 millimeters of water column or greater, 0.5 millimeters of water column or greater, or 1 millimeter of water column or greater.

[0275] The downstream section may include a mouthpiece element.

[0276] The mouthpiece element may be located downstream of at least one of the one or more hollow tubular elements. The mouthpiece element may be located downstream of one of the one or more hollow tubular elements. The mouthpiece element may extend between one of the one or more hollow tubular elements and the downstream end of the aerosol-generating article. The mouthpiece element may extend between the PLA (polylactic acid) plug and the downstream end of the aerosol-generating article.

[0277] The mouthpiece element may extend to the downstream end of the downstream section. The mouthpiece element may be located at the downstream end of the aerosol-generating article. The downstream end of the mouthpiece element may define the downstream end of the aerosol-generating article.

[0278] The mouthpiece element is preferably a solid plug and is non-tubular. The mouthpiece element may have a substantially uniform cross-section.

[0279] The mouthpiece element may be a mouth-end filter. The mouthpiece element may be formed from a fibrous filtration material. The mouthpiece element may be formed from a porous material. The mouthpiece element may be formed from a biodegradable material. The mouthpiece element may be formed from a cellulosic material. Preferably, the mouthpiece element is formed from cellulose acetate.

[0280] For example, the mouthpiece element may be formed from a bundle of cellulose acetate fibers having 10 to 15 denier per filament. For example, the mouthpiece element may be formed from a relatively low density cellulose acetate tow, such as a cellulose acetate tow containing 12 denier fibers per filament.

[0281] Preferably, the mouthpiece element has a low particle filtration efficiency. Preferably, the mouthpiece element is non-vented so that air does not enter the aerosol-generating article along the mouthpiece element.

[0282] The mouthpiece element may have a length of 5 millimeters or more, 6 millimeters or more, 10 millimeters or more, or 11 millimeters or more.

[0283] The mouthpiece element may have a length of 25 millimeters or less, 20 millimeters or less, 15 millimeters or less, 14 millimeters or less, 13 millimeters or less, 12 millimeters or less, 10 millimeters or less, or 8 millimeters or less.

[0284] The mouthpiece element may have a length of 5 mm to 25 mm, 10 mm to 25 mm, 5 mm to 20 mm, 10 mm to 20 mm, 10 mm to 14 mm, 11 mm to 13 mm, or about 12 mm.

[0285] The mouthpiece element may have a length of between 5 millimeters and 10 millimeters, between 6 millimeters and 8 millimeters, or about 7 millimeters.

[0286] The resistance to withdrawal (RTD) of the mouthpiece element per millimeter of length along the longitudinal axis of the aerosol-generating article may be between 0.1 millimeters of water column and 20 millimeters of water column, between 0.2 millimeters of water column and 10 millimeters of water column, between 0.5 millimeters of water column and 5 millimeters of water column or more, between 1 millimeter of water column and 2 millimeters of water column, between 1.3 millimeters of water column and 1.7 millimeters of water column, between 1.4 millimeters of water column and 1.6 millimeters of water column, or about 1.5 millimeters of water column.

[0287] The resistance to draw (RTD) of the mouthpiece element may be between 1 mm water column and 100 mm water column, between 2 mm water column and 50 mm water column, between 5 mm water column and 40 mm water column, between 10 mm water column and 30 mm water column, between 16 mm water column and 20 mm water column, between 17 mm water column and 19 mm water column, or about 18 mm water column.

[0288] The resistance to draw (RTD) of the mouthpiece element may be between 1 mm water column and 60 mm water column, between 2 mm water column and 30 mm water column, between 4 mm water column and 25 mm water column, between 5 mm water column and 18 mm water column, between 6 mm water column and 13 mm water column, between 9 mm water column and 12 mm water column, or about 10.5 mm water column.

[0289] The mouthpiece element may have a width approximately equal to the width of the aerosol-generating article. The width of the mouthpiece element may be substantially the same as the width of at least one of the one or more hollow tubular elements.

[0290] The width of the mouthpiece element may be between 5 mm and 10 mm, between 5.5 mm and 9 mm, or between 6 mm and 8 mm.

[0291] The mouthpiece element may include a flavorant, which may be provided in any suitable form, for example, the mouthpiece element may include one or more capsules, flavorant beads or granules, or one or more flavor-loaded threads or filaments.

[0292] The aerosol-generating article may include a flavor capsule. The flavor capsule is preferably located within the mouthpiece element. The flavor capsule is preferably a frangible capsule. For example, the flavor capsule may be broken to release the flavor contained therein. The capsule may be broken by a user-applied force when the flavor contained therein is desired. The flavor capsule may include an outer wall defining an internal cavity in which the flavor is contained. The outer wall of the flavor capsule may be formed of a pierceable or frangible material.

[0293] The resistance to draw (RTD) characteristics of the downstream section may be entirely or predominantly due to the RTD characteristics of the mouthpiece element, or in other words, the RTD of the mouthpiece element may completely dictate the RTD of the downstream section.

[0294] One or more of the components of the aerosol-generating article may be individually surrounded by its own wrapper underlying at least one of the first wrapper and the second wrapper.

[0295] At least one of the upstream element, the rod of aerosol-generating substrate, and the mouthpiece element may each be surrounded by a respective wrapper underlying at least one of the first wrapper and the second wrapper.

[0296] The aerosol-generating article comprises a rod of aerosol-generating substrate.

[0297] The rod of aerosol-generating substrate may have one of the following cross-sectional shapes: polygonal, substantially triangular, substantially elliptical, substantially rectangular or substantially circular. Preferably, the rod of aerosol-generating substrate has a substantially circular cross-sectional shape.

[0298] The rod of the aerosol-generating substrate has a rod width. The rod of the aerosol-generating substrate may also have a rod length. The rod length is the maximum dimension of the rod in the longitudinal direction of the aerosol-generating article. The rod width is the maximum dimension of the rod in the transverse direction perpendicular to the longitudinal direction.

[0299] The rod width may be 5 millimeters or more, 5.5 millimeters or more, 6 millimeters or more, 6.5 millimeters or more, or 7 millimeters or more.

[0300] The rod width may be 8 millimeters or less, or 7.5 millimeters or less.

[0301] The rod width may be 5 mm to 8 mm, 5 mm to 7.5 mm, or 5.5 mm to 8 mm, or 5.5 mm to 7.5 mm, or 6 mm to 8 mm, or 6 mm to 7.5 mm, or 6.5 mm to 8 mm, 6.5 mm to 7.5 mm, 7 mm to 8 mm, or 7 mm to 7.5 mm.

[0302] The rod length may be 1 millimeter or more, 3 millimeters or more, 5 millimeters or more, 7 millimeters or more, 9 millimeters or more, 10 millimeters or more, 11 millimeters or more, 12 millimeters or more, 13 millimeters or more, 14 millimeters or more, 15 millimeters or more, 16 millimeters or more, 18 millimeters or more, 20 millimeters or more, 22 millimeters or more, 25 millimeters or more, or 28 millimeters or more.

[0303] The rod length may be 3 mm or less, 5 mm or less, 7 mm or less, 9 mm or less, 10 mm or less, 11 mm or less, 12 mm or less, 13 mm or less, 14 mm or less, 15 mm or less, 16 mm or less, 18 mm or less, 20 mm or less, 22 mm or less, 25 mm or less, or 30 mm or less.

[0304] The rod length may be between 1 mm and 30 mm, between 5 mm and 22 mm, between 8 mm and 16 mm, between 9 mm and 15 mm, between 10 mm and 14 mm, between 10 mm and 12 mm, between 11 mm and 13 mm, about 12 mm, or about 11 mm.

[0305] The rod of aerosol-generating substrate comprises an aerosol-generating substrate.

[0306] The aerosol-generating substrate rod may include an aerosol-generating substrate and one or more additional components. For example, the aerosol-generating substrate rod may include a susceptor. For example, the aerosol-generating substrate rod may include a filler material that does not release volatile compounds when heated. The aerosol-generating substrate rod may include a support material onto which the aerosol-generating substrate is deposited, loaded, or coated.

[0307] The mass of the aerosol-generating substrate in the rod of aerosol-generating substrate may be 300 milligrams or less, 280 milligrams or less, 270 milligrams or less, 260 milligrams or less, or 250 milligrams or less. Preferably, the mass of the aerosol-generating substrate in the rod of aerosol-generating substrate is 220 milligrams or less, 210 milligrams or less, or 200 milligrams or less.

[0308] The mass of the aerosol-generating substrate in the rod of aerosol-generating substrate may be 10 milligrams to 300 milligrams, 50 milligrams to 280 milligrams, or 100 milligrams to 270 milligrams. The mass of the aerosol-generating substrate in the rod of aerosol-generating substrate is 10 milligrams to 220 milligrams, 50 milligrams to 220 milligrams, 100 milligrams to 220 milligrams, or 150 milligrams to 200 milligrams.

[0309] As used herein, the mass of the aerosol-generating substrate within the rod of aerosol-generating substrates refers to the total mass of the aerosol-generating substrates contained within the volume defined by the rod of aerosol-generating substrates. To measure the mass of the aerosol-generating substrates within the rod of aerosol-generating substrates, the aerosol-generating substrates are removed from the rod of aerosol-generating substrates and weighed. This may be repeated 20 times for 20 different individual aerosol-generating articles to obtain an average value. The mass of the aerosol-generating substrate within the rod of aerosol-generating substrates may be the dry mass of the aerosol-generating substrates within the rod of aerosol-generating substrates. The mass of the rod of aerosol-generating substrates may be determined after conditioning the aerosol-generating articles in accordance with ISO Standard 3402:1999.

[0310] The density of the aerosol-generating substrate within the rod of aerosol-generating substrate may be not more than 700 kilograms per cubic meter (0.70 milligrams per cubic millimeter), not more than 650 kilograms per cubic meter (0.65 milligrams per cubic millimeter), not more than 600 kilograms per cubic meter (0.60 milligrams per cubic millimeter), not more than 550 kilograms per cubic meter (0.55 milligrams per cubic millimeter), not more than 500 kilograms per cubic meter (0.50 milligrams per cubic millimeter), not more than 450 kilograms per cubic meter (0.45 milligrams per cubic millimeter), not more than 400 kilograms per cubic meter (0.40 milligrams per cubic millimeter), or not more than 350 kilograms per cubic meter (0.35 milligrams per cubic millimeter).

[0311] The density of the aerosol-generating substrate within the rod of aerosol-generating substrate may be 350 kilograms per cubic meter (0.35 milligrams per cubic millimeter) or more, 400 kilograms per cubic meter (0.40 milligrams per cubic millimeter) or more, 450 kilograms per cubic meter (0.45 milligrams per cubic millimeter) or more, 500 kilograms per cubic meter (0.50 milligrams per cubic millimeter) or more, 550 kilograms per cubic meter (0.55 milligrams per cubic millimeter) or more, 600 kilograms per cubic meter (0.60 milligrams per cubic millimeter) or more, 650 kilograms per cubic meter (0.65 milligrams per cubic millimeter) or more, or 700 kilograms per cubic meter (0.70 milligrams per cubic millimeter) or more.

[0312] The density of the aerosol-generating substrate within the rod of aerosol-generating substrate may range from 350 kilograms per cubic meter (0.35 milligrams per cubic millimeter) to 400 kilograms per cubic meter (0.40 milligrams per cubic millimeter), from 350 kilograms per cubic meter (0.35 milligrams per cubic millimeter) to 500 kilograms per cubic meter (0.50 milligrams per cubic millimeter), from 350 kilograms per cubic meter (0.35 milligrams per cubic millimeter) to 1000 kilograms per cubic meter (0.50 milligrams per cubic millimeter), and from 350 kilograms per cubic meter (0.35 milligrams per cubic millimeter) to 1000 kilograms per cubic meter (0.50 milligrams per cubic millimeter). 600 kilograms per cubic meter (0.60 milligrams per cubic millimeter), 350 kilograms per cubic meter (0.35 milligrams per cubic millimeter) to 700 kilograms per cubic meter (0.70 milligrams per cubic millimeter), 400 kilograms per cubic meter (0.40 milligrams per cubic millimeter) to 450 kilograms per cubic meter (0.45 milligrams per cubic millimeter), 400 kilograms per cubic meter (0.40 milligrams per cubic millimeter) to 450 kilograms per cubic meter (0.45 milligrams per cubic millimeter), 0.40 milligrams per cubic meter) to 500 kilograms per cubic meter (0.50 milligrams per cubic millimeter), 400 kilograms per cubic meter (0.40 milligrams per cubic millimeter) to 600 kilograms per cubic meter (0.60 milligrams per cubic millimeter), 400 kilograms per cubic meter (0.40 milligrams per cubic millimeter) to 700 kilograms per cubic meter (0.70 milligrams per cubic millimeter), 500 kilograms per cubic meter (1 It may be from 0.50 milligrams per cubic millimeter to 600 kilograms per cubic meter (0.60 milligrams per cubic millimeter), from 500 kilograms per cubic meter (0.50 milligrams per cubic millimeter) to 700 kilograms per cubic meter (0.70 milligrams per cubic millimeter), or from 600 kilograms per cubic meter (0.60 milligrams per cubic millimeter) to 700 kilograms per cubic meter (0.70 milligrams per cubic millimeter).

[0313] The density of the aerosol-generating substrates within the rod of aerosol-generating substrates is calculated by dividing the sum of the masses of the aerosol-generating substrates within the rod of aerosol-generating substrates by the volume of the rod of aerosol-generating substrates (minus the volume captured by the susceptor, if any). The volume of the rod of aerosol-generating substrates is calculated using the dimensions of the aerosol-generating substrates. The mass of the aerosol-generating substrates within the rod of aerosol-generating substrates is determined by removing the aerosol-generating substrates from the rod of aerosol-generating substrates and weighing the aerosol-generating substrates. This may be repeated 20 times for 20 different individual aerosol-generating articles to obtain an average value for the density of the aerosol-generating substrates within the rod of aerosol-generating substrates. The density of the aerosol-generating substrates within the rod of aerosol-generating substrates may be calculated on a dry weight basis. The density of the aerosol-generating substrates within the rod of aerosol-generating substrates may be determined after conditioning the aerosol-generating articles in accordance with ISO Standard 3402:1999.

[0314] The aerosol-generating substrate may be a solid aerosol-generating substrate.

[0315] The aerosol-generating substrate may comprise tobacco material.

[0316] As used herein, the term "tobacco material" is used to describe any material containing tobacco, including, but not limited to, tobacco leaves, tobacco veins, tobacco stems, tobacco stems, tobacco dust, expanded tobacco, reconstituted tobacco materials, and homogenized tobacco materials.

[0317] The aerosol-generating substrate within the rod of aerosol-generating substrate may comprise homogenized tobacco material, the term "homogenized tobacco material" as used herein meaning a material formed by agglomerating particulate tobacco.

[0318] The aerosol-generating substrate may comprise one or more sheets of homogenized tobacco material. As used herein, the term "sheet" refers to a layered element having a width and length that is substantially greater than its thickness.

[0319] The one or more sheets of tobacco material may each individually have a length substantially the same as the length of the rod of aerosol-generating substrate.

[0320] The aerosol-generating substrate may comprise an aggregate of sheets of homogenized tobacco material. As used herein, the term "aggregated" is used to describe a sheet that has been rolled, folded, or otherwise compressed or contracted substantially transverse to the longitudinal axis of the aerosol-generating article.

[0321] The sheet of homogenized tobacco material may be crimped. As used herein, the term "crimped" refers to a sheet having a plurality of substantially parallel ridges or corrugations. The aerosol-generating substrate may comprise an assembly of crimped sheets of homogenized tobacco material. Preferably, when the aerosol-generating article is assembled, the substantially parallel ridges or corrugations extend along or parallel to the longitudinal axis of the aerosol-generating article.

[0322] The sheet of homogenized tobacco material may be a cast sheet. The cast sheet of homogenized tobacco material may comprise tobacco particles having an average particle size (D95) of greater than 50 micrometers, between 50 micrometers and 100 micrometers, between 60 micrometers and 80 micrometers, between 65 micrometers and 75 micrometers, or about 70 micrometers prior to the molding process.

[0323] As used herein, the term "average particle size (D95)" is used to indicate the volume-based median of the particle size distribution, which is the particle diameter value at 95% of the cumulative distribution. The particle size of the particles can be analyzed by laser diffraction.

[0324] The aerosol-generating substrate preferably includes an aerosol former. The aerosol former can be any suitable known compound or mixture of compounds that promotes the formation of a dense, stable aerosol during use. The aerosol former can promote the aerosol to be substantially resistant to thermal decomposition at temperatures typically encountered during use of the aerosol-generating article. Suitable aerosol formers include, for example, polyhydric alcohols such as triethylene glycol, 1,3-butanediol, propylene glycol, and glycerin; esters of polyhydric alcohols such as glycerol mono-, di-, or triacetate; aliphatic esters of mono-, di-, or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate; and combinations thereof.

[0325] The aerosol former may include one or more of glycerin and propylene glycol. The aerosol former may consist of glycerin or propylene glycol, or a combination of glycerin and propylene glycol.

[0326] The aerosol-generating substrate may comprise at least 5 percent, at least 10 percent, or at least 12 percent by weight of aerosol formers, based on the dry weight of the aerosol-generating substrate.

[0327] The aerosol-generating substrate may comprise 30 weight percent or less, 25 weight percent or less, or 20 weight percent or less of aerosol formers, based on the dry weight of the aerosol-generating substrate.

[0328] The aerosol-generating substrate may comprise from 5 to 30 percent, from 5 to 25 percent, or from 5 to 20 percent by weight of aerosol-forming material, based on the dry weight of the aerosol-generating substrate.

[0329] The aerosol-generating substrate may comprise from about 10 weight percent to about 30 weight percent, from about 10 weight percent to about 25 weight percent, or from about 10 weight percent to about 20 weight percent aerosol former, based on the dry weight of the aerosol-generating substrate.

[0330] The aerosol-generating substrate may comprise from about 12 weight percent to about 30 weight percent, from about 12 weight percent to about 25 weight percent, or from about 12 weight percent to about 20 weight percent aerosol former, based on the dry weight of the aerosol-generating substrate.

[0331] The aerosol-generating substrate may include at least one tobacco material, on a dry weight basis, from about 1 percent to about 5 percent binder, and from about 10 percent to about 30 percent glycerin.

[0332] The aerosol-generating substrate may comprise tobacco cut filler, and preferably the aerosol-forming material content in the aerosol-generating substrate is at least about 8 percent by weight of the aerosol-generating substrate.

[0333] The aerosol-generating substrate may comprise strands of reconstituted or recycled tobacco.The aerosol-generating substrate may comprise crimped fibre pieces of reconstituted or recycled tobacco.

[0334] As used herein, the term "strand" describes an elongated element of material having a length that is substantially greater than its width and thickness. The term "strand" should be considered to encompass pieces, fragments, and any other homogenized plant material having a similar morphology. Strands of homogenized plant material may be formed from sheets of homogenized plant material, for example, by cutting or shredding, or by other methods, such as extrusion methods.

[0335] The rod of aerosol-generating substrate may comprise at least one of nicotine, one or more aerosol formers, and one or more carboxylic acids.

[0336] The aerosol-generating substrate may comprise at least one of a solid aerosol-generating substrate comprising nicotine, one or more cellulosic agents, one or more aerosol formers, and one or more carboxylic acids.

[0337] As used herein with respect to the present invention, the term "nicotine" is used to describe nicotine, nicotine base, or nicotine salts. The aerosol-generating film may include natural or synthetic nicotine.

[0338] The aerosol-generating film may include one or more monobasic nicotine salts.

[0339] As used herein in connection with the present invention, the term "monobasic nicotine salt" is used to describe a nicotine salt of a monobasic acid.

[0340] The aerosol-generating film may include one or more dibasic nicotine salts.

[0341] As used herein in connection with the present invention, the term "dibasic nicotine salt" is used to describe nicotine salts of dibasic acids.

[0342] The aerosol-generating film may comprise one or more carboxylic acids. Preferably, the aerosol-generating film comprises one or more of lactic acid, benzoic acid, fumaric acid, and levulinic acid.

[0343] The aerosol-generating substrate may be one of a solid aerosol-generating film or a solid aerosol-generating gel.

[0344] The term "film" as used herein is used to describe a solid layered element having a thickness smaller than its width or length. The film may be self-supporting. In other words, even if the film is obtained by casting a film-forming formulation onto a support surface, the film may have cohesive and mechanical properties such that the film can be separated from the support surface. Alternatively, the film may be placed on a support or sandwiched between other materials. This may enhance the mechanical stability of the film.

[0345] The aerosol-generating substrate may comprise a plurality of strips of tobacco material, such as tobacco cut filler or strips of homogenized tobacco material.

[0346] As used herein, the term "strip" means an element having a length that is substantially greater than its width and thickness.

[0347] The strips of homogenized tobacco material may be formed from a sheet of homogenized tobacco material, for example, by cutting or chopping. The strips of homogenized tobacco material may also be formed by other methods, for example, by extrusion.

[0348] The strips of tobacco material may have a width of at least about 0.3 millimeters, at least about 0.5 millimeters, or at least about 0.6 millimeters.

[0349] The strips of tobacco material may have a width of about 2 millimeters or less, about 1.2 millimeters or less, or less than about 0.9 millimeters.

[0350] The strips of tobacco material may have a width of from about 0.3 millimeters to about 2 millimeters, from about 0.3 millimeters to about 1.2 millimeters, or from about 0.3 millimeters to about 0.9 millimeters.

[0351] The strips of tobacco material may have a width of about 0.5 millimeters to about 2 millimeters, about 0.5 millimeters to about 1.2 millimeters, or about 0.5 millimeters to about 0.9 millimeters.

[0352] The strips of tobacco material may have a width of from about 0.6 millimeters to about 2 millimeters, from about 0.6 millimeters to about 1.2 millimeters, or from about 0.6 millimeters to about 0.9 millimeters.

[0353] The strips of tobacco material may have a length of at least about 10 millimeters.

[0354] The strips of tobacco material may have a length of about 40 millimeters or less.

[0355] The strips of tobacco material may have a length of from about 10 millimeters to about 40 millimeters.

[0356] On a dry weight basis, at least about 20 weight percent of the plurality of strips of tobacco material may extend along the entire length of the rod of aerosol-generating substrate.On a dry weight basis, at least about 20 weight percent of the plurality of strips of tobacco material may have a length substantially the same as the length of the rod of aerosol-generating substrate.

[0357] On a dry weight basis, about 60 percent by weight or less of the plurality of strips of tobacco material may extend along the entire length of the rod of aerosol-generating substrate.On a dry weight basis, about 60 percent by weight or less of the plurality of strips of tobacco material may have a length substantially the same as the length of the rod of aerosol-generating substrate.

[0358] On a dry weight basis, between about 20 percent and 60 percent by weight of the plurality of strips of tobacco material may extend along the entire length of the rod of aerosol-generating substrate.On a dry weight basis, between about 20 percent and 60 percent by weight of the plurality of strips of tobacco material may have a length substantially the same as the length of the rod of aerosol-generating substrate.

[0359] The aerosol-generating substrate may comprise a plurality of pellets or granules of tobacco material, such as homogenized tobacco material.

[0360] At least about 60 percent by weight of the plurality of pellets or granules may have a largest dimension greater than about 1 millimeter, at least about 70 percent by weight of the plurality of pellets or granules may have a largest dimension greater than about 1 millimeter, or at least about 80 percent by weight of the plurality of pellets or granules may have a largest dimension greater than about 1 millimeter.

[0361] If the homogenized plant material is in the form of a plurality of pellets or granules, at least about 70 percent by weight of the plurality of pellets or granules may have a maximum dimension greater than about 0.5 millimeters, at least about 80 percent by weight of the plurality of pellets or granules may have a maximum dimension greater than about 0.5 millimeters, or at least about 90 percent by weight of the plurality of pellets or granules may have a maximum dimension greater than about 0.5 millimeters.

[0362] For example, at least about 80 weight percent of the plurality of pellets or granules may have a maximum dimension greater than about 1 millimeter, and at least about 90 weight percent of the plurality of pellets or granules may have a maximum dimension greater than about 0.5 millimeters.

[0363] The rod of aerosol-generating substrate may comprise a susceptor element disposed within the rod of aerosol-generating substrate.

[0364] As used herein, the term "susceptor" means a material that can be heated when penetrated by a changing magnetic field.

[0365] The susceptor element may be formed from any material that can be inductively heated to a temperature sufficient to generate an aerosol from the aerosol-generating substrate. For example, the susceptor element may include metal or carbon. The susceptor element may include or consist of a ferromagnetic material (e.g., a ferromagnetic alloy, ferritic iron, or ferromagnetic steel or stainless steel). A suitable material may be or include aluminum. The susceptor element may be formed from 400 series stainless steel, such as grade 410, or grade 420, or grade 430 stainless steel.

[0366] The susceptor element may be at least partially surrounded by the rod of aerosol-generating substrate. The susceptor element may be completely surrounded by the rod of aerosol-generating substrate.

[0367] The susceptor element may be elongated and may be disposed substantially longitudinally within the rod of the aerosol-generating substrate. The susceptor element may be positioned at a radially central position within the rod of the aerosol-generating substrate and extend along the longitudinal axis of the aerosol-generating article.

[0368] As used herein, the term "elongated" means a component having a length dimension that is greater than its width dimension or its thickness dimension, for example, greater than twice its width dimension or its thickness dimension.

[0369] The length of the susceptor element may be equal to or less than the rod length.

[0370] The length of the susceptor element may be 99 percent or less of the rod length, 95 percent or less of the rod length, 90 percent or less of the rod length, 85 percent or less of the rod length, 80 percent or less of the rod length, 70 percent or less of the rod length, 60 percent or less of the rod length, or 50 percent or less of the rod length.

[0371] The length of the susceptor element may be 50 percent or more of the rod length, 60 percent or more of the rod length, 70 percent or more of the rod length, 80 percent or more of the rod length, 85 percent or more of the rod length, 90 percent or more of the rod length, 95 percent or more of the rod length, or 99 percent or more of the rod length.

[0372] The length of the susceptor element may be between 70 percent and 99 percent of the rod length, between 75 percent and 95 percent of the rod length, between 80 percent and 95 percent of the rod length, or between 85 percent and 95 percent of the rod length.

[0373] The susceptor elements may extend along substantially the entire length of the rod of the aerosol-generating substrate, which may advantageously provide an optimized heat distribution within the rod of the aerosol-generating substrate when the susceptor elements are heated.

[0374] The susceptor element may comprise a flat planar portion. The susceptor element may be a flat planar susceptor strip.

[0375] As used herein, the term "flat planar" refers to a generally cubic shape having a height that is significantly less than its width and length. For example, the width and length may each be at least twice the height of the cube. The height of a flat planar cube may also be referred to as the thickness of the susceptor element, or the thickness of the flat planar portion of the susceptor element.

[0376] The susceptor element can have a thickness of 0.01 millimeters to 2 millimeters, 0.5 millimeters to 2 millimeters, 10 micrometers to 500 micrometers, 10 micrometers to 100 micrometers, 35 micrometers to 85 micrometers, 45 micrometers to 75 micrometers, 55 micrometers to 65 micrometers, 57 micrometers to 63 micrometers, or 58 micrometers to 62 micrometers.

[0377] The aerosol-generating article may include an upstream section located upstream of the rod of the aerosol-generating substrate.

[0378] The upstream section is preferably located immediately upstream of the rod of the aerosol-generating substrate. In other words, the upstream section may abut the upstream end of the rod of the aerosol-generating substrate. The upstream section may extend between the upstream end of the aerosol-generating article and the rod of the aerosol-generating substrate.

[0379] The upstream section may include one or more upstream elements.

[0380] One or more of the upstream elements may include a solid cylindrical plug element having a filled cross section.

[0381] Advantageously, the one or more upstream elements prevent direct physical contact of the aerosol-generating substrate with the upstream end of the rod. Furthermore, the presence of the one or more upstream elements helps to prevent any loss of the substrate, which may be advantageous, for example, when the substrate contains particulate plant material. Advantageously, the one or more upstream elements may prevent a heating element, such as a susceptor, from falling off the aerosol-generating article.

[0382] One or more of the upstream elements may be made of a porous material or may comprise a plurality of openings, which may be achieved, for example, by laser drilling, preferably uniformly distributed across the cross section of the upstream element.

[0383] The porosity or permeability of the upstream element may advantageously be designed to provide an aerosol-generating article with a particular overall resistance to draw (RTD) without substantially affecting the filtration provided by other portions of the article.

[0384] The one or more upstream elements may comprise hollow tubular segments defining a longitudinal cavity that provides an unrestricted flow channel, in which case the resistance to withdrawal (RTD) of the hollow tubular segments may be negligible.

[0385] The one or more upstream elements may be made of the same material as that used for one of the other components of the aerosol-generating article, such as the mouthpiece element or one or more hollow tubular elements. Suitable materials for forming the upstream element include filter material, ceramic, polymeric material, cellulose acetate, cardboard, zeolite, or the aerosol-generating substrate. The one or more upstream elements may include a plug of cellulose acetate. The one or more upstream elements may comprise a hollow acetate tube or a cardboard tube.

[0386] Preferably, the one or more upstream elements have a width approximately equal to the width of the aerosol-generating article.

[0387] The length of at least one of the one or more upstream elements along the longitudinal axis of the aerosol-generating article may be between 1 millimeter and 10 millimeters, between 3 millimeters and 7 millimeters, between 4 millimeters and 6 millimeters, or about 5 millimeters.

[0388] The resistance to withdrawal (RTD) of the one or more upstream elements may be between 1 mm water column and 150 mm water column, between 2 mm water column and 50 mm water column, between 3 mm water column and 20 mm water column, or between 4 mm water column and 10 mm water column.

[0389] The downstream section may include an aerosol-forming section, which may include a rod and an intermediate section of the aerosol-generating substrate.

[0390] The intermediate section may be located downstream of the rod of the aerosol-generating substrate. The intermediate section may comprise one or more hollow tubular elements. The intermediate section may comprise a PLA (polylactic acid) plug. The mouthpiece element may be located downstream of the intermediate section. The aerosol-forming section may further comprise an upstream section.

[0391] The first wrapper may surround at least a portion of the aerosol-forming section. The first wrapper may surround the aerosol-forming section along the entire length of the aerosol-forming section. The first wrapper may surround only the aerosol-forming section. The first wrapper may not surround the mouthpiece element.

[0392] The second wrapper may enclose one or both of the mouthpiece element and at least a portion of the aerosol-forming section.

[0393] An aerosol generating system may also be provided, comprising: The aerosol-generating device may comprise any of the aerosol-generating articles disclosed above, and the aerosol-generating device may comprise a heating element or part of a heating element for heating the aerosol-generating article.

[0394] As used herein, the term "aerosol-generating device" refers to a device that interacts with an aerosol-generating substrate to generate an aerosol. In some instances, the aerosol-generating device heats the aerosol-generating substrate to promote the release of volatile compounds from the substrate.

[0395] As used herein, the term "aerosol-generating system" refers to the combination of an aerosol-generating device and an aerosol-generating article.

[0396] Because the aerosol-generating systems of the present disclosure comprise the aerosol-generating articles described herein, the advantages discussed above for the aerosol-generating articles also apply to the systems themselves.

[0397] The aerosol-generating device may further include a device cavity configured to receive at least a portion of the aerosol-generating article. The device cavity may have a closed end and an open end. The aerosol-generating article may be insertable into the device cavity through the open end. The device cavity may have substantially the same cross-sectional shape as the aerosol-generating article.

[0398] The device cavity may have a device cavity length, which may be substantially the same as or longer than the rod length. The device cavity length may be such that when the aerosol-generating article is received within the aerosol-generating device, at least 75 percent of the rod length is received within the device cavity, at least 80 percent of the rod length is received within the device cavity, or at least 90 percent of the rod length is received within the device cavity.

[0399] Advantageously, providing a device cavity length that is substantially the same as or longer than the rod length ensures that the entire rod of aerosol-generating substrate can be received within the device cavity, which can reduce insufficient heating of downstream portions of the rod of aerosol-generating substrate and result in more uniform heating along the length of the rod.

[0400] The aerosol generating device may also include a heating element.

[0401] The heating element may be in the form of a pin or blade configured for insertion into the rod of the aerosol-generating substrate. The pin or blade may be located within the device cavity. When the aerosol-generating substrate of the aerosol-generating article is received within the device cavity, the pin or blade heating element may penetrate and be inserted into the aerosol-generating substrate to heat it from the inside.

[0402] When the aerosol-generating article is received by an aerosol-generating device, the pin or blade may penetrate the rod of the aerosol-generating substrate substantially through the centre of a cross-sectional surface of the rod perpendicular to the length of the rod.

[0403] Advantageously, providing a pin or blade that penetrates the rod of the aerosol-generating substrate through the centre of the cross-sectional surface of the rod substantially perpendicular to the rod length can result in more uniform heating of the rod of the aerosol-generating substrate.

[0404] Alternatively or additionally, the heating element may be an external heating element, i.e., the heating element may be located at the periphery of the device cavity, and may surround the aerosol-generating article when the aerosol-generating article is at least partially received within the device cavity.

[0405] Alternatively, or additionally, as mentioned above, the rod of aerosol-generating substrate may comprise a heating element in the form of a susceptor element disposed within the rod of aerosol-generating substrate.

[0406] The heating element may comprise one of a resistive heating element and a susceptor element.

[0407] The heating element may comprise a resistive heating element. The heating element may be a resistive heating element. The pins or blades may be resistive heating elements. The external heating element may be a resistive heating element.

[0408] The heating element may comprise an electrically resistive material. Suitable electrically resistive materials include, but are not limited to, semiconductors such as doped ceramics, "conductive" ceramics (e.g., molybdenum disilicide), carbon, graphite, metals, alloys, and composites of ceramic and metallic materials. Such composites may include doped or undoped ceramics. An example of a suitable doped ceramic is doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum, and platinum group metals. Examples of suitable metal alloys include stainless steel, constantan, nickel-, cobalt-, chromium-, aluminum-, titanium-, zirconium-, hafnium-, niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese-, and iron-containing alloys, as well as nickel-, iron-, cobalt-, and stainless steel-based superalloys, Timetal®, iron-aluminum-based alloys, and iron-manganese-aluminum-based alloys. Timetal® is a registered trademark of Titanium Metals Corporation, 1999 Broadway, Suite 4300, Denver, Colorado. In composite materials, the electrically resistive material may optionally be embedded in, encapsulated in, or coated with an insulating material, or vice versa, depending on the required energy transfer kinetics and external physicochemical properties. The heating element may include a metallic, etched foil insulated between two layers of inert material. In this case, the inert material may include Kapton®, an all-layer polyimide, or mica foil. Kapton® is a registered trademark of EI du Pont de Nemours and Company, 1007 Market Street, Wilmington, Delaware 19898, USA.

[0409] The heating element may comprise a susceptor element. The heating element may be a susceptor element. A pin or blade may be a susceptor element. An external heating element may be a susceptor element. The susceptor element may be disposed within the rod of the aerosol-generating substrate.

[0410] As used herein, the term "susceptor" means a material that can be heated when penetrated by a changing magnetic field.

[0411] The aerosol generating device may be capable of generating a fluctuating electromagnetic field of 1 to 30 MHz, for example, 2 to 10 MHz, for example, 5 to 7 MHz. The device may be capable of generating a fluctuating magnetic field having a field strength (H field) of 1 to 5 kA / m, for example, 2 to 3 kA / m, for example, about 2.5 kA / m.

[0412] The susceptor element may be formed from any material that can be inductively heated to a temperature sufficient to generate an aerosol from the aerosol-generating substrate. For example, the susceptor element may comprise metal or carbon.

[0413] The susceptor elements may include or consist of a ferromagnetic material (e.g., a ferromagnetic alloy, ferritic iron, or ferromagnetic steel or stainless steel). A suitable material may be or include aluminum. The susceptor elements may be formed from 400 series stainless steel, such as grade 410, or grade 420, or grade 430 stainless steel.

[0414] Different materials dissipate different amounts of energy when placed in electromagnetic fields with similar values ​​of frequency and field strength. Thus, any of the parameters of the susceptor elements, such as material type, length, width, and thickness, can be varied to provide a desired power distribution in a known electromagnetic field.

[0415] The susceptor element can be heated to temperatures in excess of 250 degrees Celsius.

[0416] If a susceptor element is provided, the aerosol-generating device may include an inductor coil arranged to inductively heat the susceptor element. The aerosol-generating device may include an inductor coil. If the aerosol-generating device includes a device cavity, the inductor coil may at least partially surround the device cavity. The inductor coil may be arranged to coaxially surround the device cavity.

[0417] The aerosol generating device may further comprise a controller.

[0418] In use, the heating element may be controlled to operate such that the operating temperature range of the heating element is between 150 degrees Celsius and 350 degrees Celsius, between 200 degrees Celsius and 330 degrees Celsius, or between 260 degrees Celsius and 320 degrees Celsius.

[0419] In use, the heating element may be controlled to heat to a peak temperature of 350 degrees Celsius or less, 335 degrees Celsius or less, or 320 degrees Celsius or less.

[0420] In use, the heating element may be controlled to heat to a peak temperature of between 220 degrees Celsius and 350 degrees Celsius, between 240 degrees Celsius and 335 degrees Celsius, or between 260 degrees Celsius and 320 degrees Celsius.

[0421] The aerosol generating device may further include a power source. The power source may be a DC power source. The power source may be a battery. The power source may be a nickel metal hydride battery, a nickel cadmium battery, or a lithium-based battery, such as a lithium cobalt, lithium-oxygen-phosphate, or lithium polymer battery. The power source may also be another form of charge storage device, such as a capacitor. The power source may be rechargeable and may have a capacity capable of storing sufficient energy for one or more user operations, such as one or more aerosol generating experiences. [Example]

[0422] The following provides a non-exhaustive list of non-limiting examples, any one or more of the features of these examples may be combined with any one or more of the features described above, for example, with any one or more features of another example, embodiment, or aspect described herein.

[0423] Example 1: An aerosol-generating article comprising: a rod of an aerosol-generating substrate; a downstream section of the aerosol-generating substrate located downstream of the rod, the downstream section comprising one or more hollow tubular elements; at least two wrappers, comprising a first wrapper and a second wrapper, each of the first wrapper and the second wrapper surrounding at least one of the rod and the downstream section of the aerosol-generating substrate; An aerosol-generating article, wherein the first wrapper and the second wrapper each have a bulk of 1.42 cubic centimeters per gram or less. Example 2: the first wrapper has a bulk of 0.75 cubic centimeters per gram or more, optionally 0.80 cubic centimeters per gram or more, optionally 0.85 cubic centimeters per gram or more, optionally 0.90 cubic centimeters per gram or more, optionally 0.93 cubic centimeters per gram or more, optionally 0.96 cubic centimeters per gram or more, or optionally 1.10 cubic centimeters per gram or more; and 10. The aerosol-generating article of claim 1, wherein the second wrapper has one or both of a bulk density of 0.75 cubic centimeters per gram or more, optionally 0.80 cubic centimeters per gram or more, optionally 0.85 cubic centimeters per gram or more, optionally 0.90 cubic centimeters per gram or more, optionally 0.93 cubic centimeters per gram or more, optionally 0.96 cubic centimeters per gram or more, or optionally 1.10 cubic centimeters per gram or more. Example 3: the first wrapper has a bulk of 1.38 cubic centimeters per gram or less, optionally 1.37 cubic centimeters per gram or less, optionally 1.30 cubic centimeters per gram or less, or optionally 1.23 cubic centimeters per gram or less; and 3. The aerosol-generating article of claim 1 or 2, wherein the second wrapper has one or both of a bulk of 1.38 cubic centimeters per gram or less, optionally 1.37 cubic centimeters per gram or less, optionally 1.30 cubic centimeters per gram or less, or optionally 1.23 cubic centimeters per gram or less. Example 4: the first wrapper has a volume of between 0.75 cubic centimeters per gram and 1.42 cubic centimeters per gram, optionally between 0.80 cubic centimeters per gram and 1.42 cubic centimeters per gram, optionally between 0.85 cubic centimeters per gram and 1.42 cubic centimeters per gram, optionally between 0.90 cubic centimeters per gram and 1.42 cubic centimeters per gram, optionally between 0.93 cubic centimeters per gram and 1.42 cubic centimeters per gram, optionally between 0.96 cubic centimeters per gram; cubic centimeters per gram to 1.42 cubic centimeters per gram, optionally 1.10 cubic centimeters per gram to 1.42 cubic centimeters per gram, optionally 0.75 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 0.80 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 0.85 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 0.90 cubic centimeters per gram to 1.38 cubic centimeters per gram cubic centimeters, optionally 0.93 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 0.96 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 1.10 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 0.75 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 0.80 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 0. 85 cubic centimeters to 1.37 cubic centimeters per gram, optionally 0.90 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 0.93 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 0.96 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 1.10 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 0.75 cubic centimeters per gram to 1.30 cubic centimeters, optionally 0.80 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 0.85 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 0.90 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 0.93 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 0.96 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 1.10 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 0.75 cubic centimeters per gram to 1.23 cubic centimeters per gram, optionally 0.80 cubic centimeters per gram to 1.23 cubic centimeters per gram, optionally 0.85 cubic centimeters per gram to 1.23 cubic centimeters per gram, optionally 0.90 cubic centimeters per gram to 1.23 cubic centimeters per gram, optionally 0.93 cubic centimeters per gram to 1.23 cubic centimeters per gram, optionally 0.96 cubic centimeters per gram to 1.23 cubic centimeters per gram, or optionally 1.10 cubic centimeters per gram to 1.23 cubic centimeters per gram; and the second wrapper has a volume of between 0.75 cubic centimeters per gram and 1.42 cubic centimeters per gram, optionally between 0.80 cubic centimeters per gram and 1.42 cubic centimeters per gram, optionally between 0.85 cubic centimeters per gram and 1.42 cubic centimeters per gram, optionally between 0.90 cubic centimeters per gram and 1.42 cubic centimeters per gram, optionally between 0.93 cubic centimeters per gram and 1.42 cubic centimeters per gram, optionally between 0.96 cubic centimeters per gram cubic centimeters per gram to 1.42 cubic centimeters per gram, optionally 1.10 cubic centimeters per gram to 1.42 cubic centimeters per gram, optionally 0.75 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 0.80 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 0.85 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 0.90 cubic centimeters per gram to 1.38 cubic centimeters per gram cubic centimeters, optionally 0.93 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 0.96 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 1.10 cubic centimeters per gram to 1.38 cubic centimeters per gram, optionally 0.75 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 0.80 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 0. 85 cubic centimeters to 1.37 cubic centimeters per gram, optionally 0.90 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 0.93 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 0.96 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 1.10 cubic centimeters per gram to 1.37 cubic centimeters per gram, optionally 0.75 cubic centimeters per gram to 1.30 cubic centimeters, optionally 0.80 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 0.85 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 0.90 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 0.93 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 0.96 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 1.10 cubic centimeters per gram to 1.30 cubic centimeters per gram, optionally 0.75 cubic centimeters per gram to 1.23 cubic centimeters per gram 4. The aerosol-generating article of any one of Examples 1 to 3, having a bulk of one or both of 0.80 cubic centimeters per gram to 1.23 cubic centimeters per gram, optionally 0.85 cubic centimeters per gram to 1.23 cubic centimeters per gram, optionally 0.90 cubic centimeters per gram to 1.23 cubic centimeters per gram, optionally 0.93 cubic centimeters per gram to 1.23 cubic centimeters per gram, optionally 0.96 cubic centimeters per gram to 1.23 cubic centimeters per gram, or optionally 1.10 cubic centimeters per gram to 1.23 cubic centimeters per gram. Example 5: the first wrapper has a thickness of 36 micrometers or greater, optionally 40 micrometers or greater, optionally 41 micrometers or greater, optionally 45 micrometers or greater, optionally 46 micrometers or greater, optionally 50 micrometers or greater, optionally 60 micrometers or greater, optionally 70 micrometers or greater, or optionally 80 micrometers or greater; and An aerosol-generating article according to any one of Examples 1 to 4, wherein the second wrapper has one or both of a thickness of 36 micrometers or more, optionally 40 micrometers or more, optionally 41 micrometers or more, optionally 45 micrometers or more, optionally 46 micrometers or more, optionally 50 micrometers or more, optionally 60 micrometers or more, optionally 70 micrometers or more, or optionally 80 micrometers or more. Example 6: the first wrapper has a thickness of 90 micrometers or less, optionally 80 micrometers or less, optionally 70 micrometers or less, optionally 60 micrometers or less, optionally 55 micrometers or less, optionally 50 micrometers or less, optionally 46 micrometers or less, optionally 45 micrometers or less, optionally 41 micrometers or less, or optionally 40 micrometers or less; and 6. An aerosol-generating article according to any one of Examples 1 to 5, wherein the second wrapper has one or both of a thickness of 90 micrometers or less, optionally 80 micrometers or less, optionally 70 micrometers or less, optionally 60 micrometers or less, optionally 55 micrometers or less, optionally 50 micrometers or less, optionally 46 micrometers or less, optionally 45 micrometers or less, optionally 41 micrometers or less, or optionally 40 micrometers or less. Example 7: the first wrapper is between 36 micrometers and 90 micrometers, optionally between 36 micrometers and 80 micrometers, optionally between 36 micrometers and 70 micrometers, optionally between 36 micrometers and 60 micrometers, optionally between 36 micrometers and 55 micrometers, optionally between 36 micrometers and 50 micrometers, optionally between 36 micrometers and 46 micrometers, optionally between 36 micrometers and 45 micrometers, optionally between 36 micrometers and 41 micrometers, optionally between 36 micrometers and 40 micrometers, optionally 40 micrometers to 90 micrometers, optionally 40 micrometers to 80 micrometers, optionally 40 micrometers to 70 micrometers, optionally 40 micrometers to 60 micrometers, optionally 40 micrometers to 55 micrometers, optionally 40 micrometers to 50 micrometers, optionally 40 micrometers to 46 micrometers, optionally 40 micrometers to 45 micrometers, optionally 40 micrometers to 41 micrometers, optionally 41 micrometers micrometers to 90 micrometers, optionally 41 micrometers to 80 micrometers, optionally 41 micrometers to 70 micrometers, optionally 41 micrometers to 60 micrometers, optionally 41 micrometers to 55 micrometers, optionally 41 micrometers to 50 micrometers, optionally 41 micrometers to 46 micrometers, optionally 41 micrometers to 45 micrometers, optionally 45 micrometers to 90 micrometers, optionally 45 micrometers to 80 micrometers, optionally 4 5 micrometers to 70 micrometers, optionally 45 micrometers to 60 micrometers, optionally 45 micrometers to 55 micrometers, optionally 45 micrometers to 50 micrometers, optionally 45 micrometers to 46 micrometers, optionally 46 micrometers to 90 micrometers, optionally 46 micrometers to 80 micrometers, optionally 46 micrometers to 70 micrometers, optionally 46 micrometers to 60 micrometers, optionally 46 micrometers to 55 micrometers;optionally having a thickness of between 46 micrometers and 50 micrometers, optionally between 50 micrometers and 90 micrometers, optionally between 50 micrometers and 80 micrometers, optionally between 50 micrometers and 70 micrometers, optionally between 50 micrometers and 60 micrometers, optionally between 50 micrometers and 55 micrometers, optionally between 60 micrometers and 90 micrometers, optionally between 60 micrometers and 80 micrometers, optionally between 60 micrometers and 70 micrometers, optionally between 70 micrometers and 90 micrometers, optionally between 70 micrometers and 80 micrometers, or optionally between 80 micrometers and 90 micrometers; and the second wrapper is between 36 micrometers and 90 micrometers, optionally between 36 micrometers and 80 micrometers, optionally between 36 micrometers and 70 micrometers, optionally between 36 micrometers and 60 micrometers, optionally between 36 micrometers and 55 micrometers, optionally between 36 micrometers and 50 micrometers, optionally between 36 micrometers and 46 micrometers, optionally between 36 micrometers and 45 micrometers, optionally between 36 micrometers and 41 micrometers, optionally between 36 micrometers and 40 micrometers, optionally 40 micrometers to 90 micrometers, optionally 40 micrometers to 80 micrometers, optionally 40 micrometers to 70 micrometers, optionally 40 micrometers to 60 micrometers, optionally 40 micrometers to 55 micrometers, optionally 40 micrometers to 50 micrometers, optionally 40 micrometers to 46 micrometers, optionally 40 micrometers to 45 micrometers, optionally 40 micrometers to 41 micrometers, optionally 41 micrometers micrometers to 90 micrometers, optionally 41 micrometers to 80 micrometers, optionally 41 micrometers to 70 micrometers, optionally 41 micrometers to 60 micrometers, optionally 41 micrometers to 55 micrometers, optionally 41 micrometers to 50 micrometers, optionally 41 micrometers to 46 micrometers, optionally 41 micrometers to 45 micrometers, optionally 45 micrometers to 90 micrometers, optionally 45 micrometers to 80 micrometers, optionally 4 5 micrometers to 70 micrometers, optionally 45 micrometers to 60 micrometers, optionally 45 micrometers to 55 micrometers, optionally 45 micrometers to 50 micrometers, optionally 45 micrometers to 46 micrometers, optionally 46 micrometers to 90 micrometers, optionally 46 micrometers to 80 micrometers, optionally 46 micrometers to 70 micrometers, optionally 46 micrometers to 60 micrometers, optionally 46 micrometers to 55 micrometers;The aerosol-generating article of any of Examples 1 to 6, optionally having a thickness of 46 micrometers to 50 micrometers, optionally 50 micrometers to 90 micrometers, optionally 50 micrometers to 80 micrometers, optionally 50 micrometers to 70 micrometers, optionally 50 micrometers to 60 micrometers, optionally 50 micrometers to 55 micrometers, optionally 60 micrometers to 90 micrometers, optionally 60 micrometers to 80 micrometers, optionally 60 micrometers to 70 micrometers, optionally 70 micrometers to 90 micrometers, optionally 70 micrometers to 80 micrometers, or optionally 80 micrometers to 90 micrometers. Example 8: the first wrapper has a basis weight of 33.5 grams per square meter or greater, optionally 36.5 grams per square meter or greater, optionally 38.5 grams per square meter or greater, optionally 39.0 grams per square meter or greater, optionally 50 grams per square meter or greater, or optionally 60 grams per square meter or greater; and 8. An aerosol-generating article according to any one of Examples 1 to 7, wherein the second wrapper has one or both of a basis weight of 33.5 grams per square meter or more, optionally 36.5 grams per square meter or more, optionally 38.5 grams per square meter or more, optionally 39.0 grams per square meter or more, optionally 50 grams per square meter or more, or optionally 60 grams per square meter or more. Example 9: the first wrapper has a basis weight of 70 grams per square meter or less, optionally 60 grams per square meter or less, optionally 50 grams per square meter or less, optionally 42 grams per square meter or less, optionally 41.5 grams per square meter or less, optionally 38.5 grams per square meter or less, or optionally 36.5 grams per square meter or less, and 9. An aerosol-generating article according to any one of Examples 1 to 8, wherein the second wrapper has one or both of a basis weight of 70 grams per square meter or less, optionally 60 grams per square meter or less, optionally 50 grams per square meter or less, optionally 42 grams per square meter or less, optionally 41.5 grams per square meter or less, optionally 38.5 grams per square meter or less, or optionally 36.5 grams per square meter or less. Example 10: the first wrapper has a mass of between 33.5 grams per square meter and 70 grams per square meter, optionally between 33.5 grams per square meter and 60 grams per square meter, optionally between 33.5 grams per square meter and 50 grams per square meter, optionally between 33.5 grams per square meter and 42 grams per square meter, optionally between 33.5 grams per square meter and 41.5 grams per square meter, optionally between 33.5 grams per square meter and 38.5 grams per square meter, optionally between 33.5 grams per square meter and 41.5 grams per square meter, 33.5 grams per square meter to 36.5 grams per square meter, optionally 36.5 grams per square meter to 70 grams per square meter, optionally 36.5 grams per square meter to 60 grams per square meter, optionally 36.5 grams per square meter to 50 grams per square meter, optionally 36.5 grams per square meter to 42 grams per square meter, optionally 36.5 grams per square meter to 41.5 grams per square meter, optionally 36.5 grams per square meter to 50 grams per square meter 38.5 grams, optionally 38.5 grams per square meter to 70 grams per square meter, optionally 38.5 grams per square meter to 60 grams per square meter, optionally 38.5 grams per square meter to 50 grams per square meter, optionally 38.5 grams per square meter to 42 grams per square meter, optionally 38.5 grams per square meter to 41.5 grams per square meter, optionally 39 grams per square meter to 70 grams per square meter, optionally 3 9 grams per square meter to 60 grams per square meter, optionally 39 grams per square meter to 50 grams per square meter, optionally 39 grams per square meter to 42 grams per square meter, optionally 39 grams per square meter to 41.5 grams per square meter, optionally 50 grams per square meter to 70 grams per square meter, optionally 50 grams per square meter to 60 grams per square meter, or optionally 60 grams per square meter to 70 grams per square meter; and the second wrapper is between 33.5 grams per square meter and 70 grams per square meter, optionally between 33.5 grams per square meter and 60 grams per square meter, optionally between 33.5 grams per square meter and 50 grams per square meter, optionally between 33.5 grams per square meter and 42 grams per square meter, optionally between 33.5 grams per square meter and 41.5 grams per square meter, optionally between 33.5 grams per square meter and 38.5 grams per square meter, optionally 33.5 grams per square meter to 36.5 grams per square meter, optionally 36.5 grams per square meter to 70 grams per square meter, optionally 36.5 grams per square meter to 60 grams per square meter, optionally 36.5 grams per square meter to 50 grams per square meter, optionally 36.5 grams per square meter to 42 grams per square meter, optionally 36.5 grams per square meter to 41.5 grams per square meter, optionally 36.5 grams per square meter to 38.5 grams per square meter, optionally 38.5 grams per square meter to 70 grams per square meter, optionally 38.5 grams per square meter to 60 grams per square meter, optionally 38.5 grams per square meter to 50 grams per square meter, optionally 38.5 grams per square meter to 42 grams per square meter Ram, 38.5 grams per square meter to 41.5 grams per square meter at will, 39 grams per square meter to 70 grams per square meter at will, 39 grams per square meter to 60 grams per square meter at will, 39 grams per square meter to 50 grams per square meter at will, 39 grams per square meter to 42 grams per square meter at will, 39 grams per square meter to 41 grams per square meter at will.10. The aerosol-generating article of any one of Examples 1 to 9, having one or both of a basis weight of 5 grams per square meter, optionally 50 grams per square meter to 70 grams per square meter, optionally 50 grams per square meter to 60 grams per square meter, or optionally 60 grams per square meter to 70 grams per square meter. Example 11: An aerosol-generating article according to any one of Examples 1 to 10, wherein the first wrapper and the second wrapper each form at least a portion of the outer surface of the article. Example 12: An aerosol-generating article according to any one of Examples 1 to 11, wherein the first wrapper has a first wrapper length, the second wrapper has a second wrapper length, and the aerosol-generating article has an article length. Example 13: 13. The aerosol-generating article of example 12, wherein one or both of the first wrapper length and the second wrapper length is less than the article length. Example 14: 14. The aerosol-generating article of any one of Examples 12 and 13, wherein the first wrapper length is equal to or greater than the second wrapper length, and optionally the first wrapper length is substantially equal to the article length. Example 15: the first wrapper length is 30 percent or more of the article length, optionally 40 percent or more of the article length, optionally 50 percent or more of the article length, optionally 60 percent or more of the article length, optionally 70 percent or more of the article length, optionally 80 percent or more of the article length, or optionally 90 percent or more of the article length; and An aerosol-generating article described in any one of Examples 12 to 14, wherein the second wrapper length is one or both of: 30 percent or more of the article length, optionally 40 percent or more of the article length, optionally 50 percent or more of the article length, optionally 60 percent or more of the article length, optionally 70 percent or more of the article length, optionally 80 percent or more of the article length, or optionally 90 percent or more of the article length. Example 16: the first wrapper length is 95 percent or less of the article length, optionally 90 percent or less of the article length, optionally 80 percent or less of the article length, optionally 70 percent or less of the article length, optionally 60 percent or less of the article length, optionally 50 percent or less of the article length, or optionally 40 percent or less of the article length; and An aerosol-generating article described in any one of Examples 12 to 15, wherein the second wrapper length is one or both of: 95 percent or less of the article length, optionally 90 percent or less of the article length, optionally 80 percent or less of the article length, optionally 70 percent or less of the article length, optionally 60 percent or less of the article length, optionally 50 percent or less of the article length, or optionally 40 percent or less of the article length. Example 17: the first wrapper length is between 30 percent and 95 percent of the article length, optionally between 30 percent and 90 percent of the article length, optionally between 30 percent and 80 percent of the article length, optionally between 30 percent and 70 percent of the article length, optionally between 30 percent and 60 percent of the article length, optionally between 30 percent and 50 percent of the article length, optionally between 30 percent and 40 percent of the article length, optionally between 40 percent and 95 percent of the article length, optionally between 40 percent and 90 percent of the article length, optionally between 40 percent and 80 percent of the article length, optionally between 40 percent and 70 percent of the article length, optionally between 40 percent and 60 percent of the article length, optionally between 40 percent and 50 percent of the article length, optionally between 50 percent and 95 percent of the article length; , optionally 50 percent to 90 percent of the article length, optionally 50 percent to 80 percent of the article length, optionally 50 percent to 70 percent of the article length, optionally 50 percent to 60 percent of the article length, optionally 60 percent to 95 percent of the article length, optionally 60 percent to 90 percent of the article length, optionally 60 percent to 80 percent of the article length, optionally 60 percent to 70 percent of the article length, optionally 70 percent to 95 percent of the article length, optionally 70 percent to 90 percent of the article length, optionally 70 percent to 80 percent of the article length, optionally 80 percent to 95 percent of the article length, optionally 80 percent to 90 percent of the article length, or optionally 90 percent to 95 percent of the article length; and the second wrapper length is between 30 percent and 95 percent of the article length, optionally between 30 percent and 90 percent of the article length, optionally between 30 percent and 80 percent of the article length, optionally between 30 percent and 70 percent of the article length, optionally between 30 percent and 60 percent of the article length, optionally between 30 percent and 50 percent of the article length, optionally between 30 percent and 40 percent of the article length, optionally between 40 percent and 95 percent of the article length, optionally between 40 percent and 90 percent of the article length, optionally between 40 percent and 80 percent of the article length, optionally between 40 percent and 70 percent of the article length, optionally between 40 percent and 60 percent of the article length, optionally between 40 percent and 50 percent of the article length, optionally between 50 percent and 95 percent of the article length, optionally between 50 percent and 90 percent of the article length 17. The aerosol-generating article of any one of Examples 12-16, wherein the aerosol-generating article is one or both of the following: centimeters, optionally 50 percent to 80 percent of the length of the article, optionally 50 percent to 70 percent of the length of the article, optionally 50 percent to 60 percent of the length of the article, optionally 60 percent to 95 percent of the length of the article, optionally 60 percent to 90 percent of the length of the article, optionally 60 percent to 80 percent of the length of the article, optionally 60 percent to 70 percent of the length of the article, optionally 70 percent to 95 percent of the length of the article, optionally 70 percent to 90 percent of the length of the article, optionally 70 percent to 80 percent of the length of the article, optionally 80 percent to 95 percent of the length of the article, optionally 80 percent to 90 percent of the length of the article, or optionally 90 percent to 95 percent of the length of the article. Example 18: 18. The aerosol-generating article of any one of Examples 1 to 17, wherein one or both of the first wrapper and the second wrapper extend from the upstream end of the article. Example 19: 19. The aerosol-generating article of any one of Examples 1 to 18, wherein one or both of the first wrapper and the second wrapper extend from the downstream end of the article. Example 20: 20. An aerosol-generating article according to any one of Examples 1 to 19, wherein a first wrapper extends from an upstream end of the article and a second wrapper extends from a downstream end of the article. Example 21: An aerosol-generating article according to any one of Examples 1 to 20, wherein the downstream end of the second wrapper is downstream of the downstream end of the first wrapper. Example 22: An aerosol-generating article according to any one of Examples 1 to 21, wherein the upstream end of the first wrapper is upstream of the upstream end of the second wrapper. Example 23: An aerosol-generating article described in any of Examples 1 to 22, wherein one or both of the first wrapper and the second wrapper optionally comprises a cellulosic material selected from one or more of paper, wood, textiles, natural fibers, and man-made fibers. Example 24: An aerosol-generating article described in any of Examples 1 to 23, wherein one or both of the first wrapper and the second wrapper comprises a water-resistant barrier coating on at least a portion of an inner surface, and optionally the water-resistant barrier coating comprises one or both of alkylketene dimer (AKD) and rosin. Example 25: An aerosol-generating article according to any one of Examples 1 to 24, wherein the basis weight of the second wrapper is greater than the basis weight of the first wrapper. Example 26: An aerosol-generating article according to any one of Examples 1 to 25, wherein the thickness of the second wrapper is greater than the thickness of the first wrapper. Example 27: An aerosol-generating article described in any of Examples 1 to 26, wherein one or both of the first wrapper and the second wrapper have a printed element on at least one of the inner or outer surfaces of the wrapper, optionally, only one of the first wrapper and the second wrapper has a printed element on at least one of the inner or outer surfaces of the wrapper, optionally, only the second wrapper has a printed element on at least one of the inner or outer surfaces of the wrapper, and optionally, the printed element includes at least one of indicia, text, image, character, phrase, shape, logo, color, graphic, pattern, coating, or combination thereof. Example 28: An aerosol-generating article described in any of Examples 1 to 27, wherein one or both of the first wrapper and the second wrapper contain a filler, and optionally the filler content of one or both of the first wrapper and the second wrapper is 30 weight percent or less of the wrapper, and optionally the filler is calcium carbonate. Example 29: An aerosol-generating article described in any of Examples 1 to 28, wherein each surface of the first wrapper and the second wrapper has a wire side and a non-wire side opposite the wire side, and optionally the non-wire side faces outward. Example 30: the non-wire side of the first wrapper has a contact angle that is equal to or greater than the contact angle of the non-wire side of the second wrapper; and and / or the wire side of the first wrapper has a contact angle that is equal to or greater than the contact angle of the wire side of the second wrapper. Example 31: At least one of the non-wire side and the wire side of the first wrapper has a contact angle of 45 degrees or greater, optionally 50 degrees or greater, optionally 60 degrees or greater, optionally 65 degrees or greater, or optionally 73 degrees or greater; and An aerosol-generating article described in Example 29 or 30, wherein at least one of the non-wire side and the wire side of the second wrapper has one or both of a contact angle of 45 degrees or more, optionally 50 degrees or more, optionally 60 degrees or more, optionally 65 degrees or more, or optionally 73 degrees or more. Example 32: At least one of the non-wire side and the wire side of the first wrapper has a contact angle of 73 degrees or less, optionally 65 degrees or less, or optionally 60 degrees or less; and An aerosol-generating article described in any one of Examples 29 to 31, wherein at least one of the non-wire side and the wire side of the second wrapper has a contact angle of 73 degrees or less, optionally 65 degrees or less, or optionally 60 degrees or less. Example 33: At least one of the non-wire side and the wire side of the first wrapper has a contact angle between 45 degrees and 75 degrees, optionally between 45 degrees and 65 degrees, optionally between 45 degrees and 60 degrees, optionally between 50 degrees and 73 degrees, optionally between 50 degrees and 65 degrees, optionally between 50 degrees and 60 degrees, optionally between 60 degrees and 73 degrees, optionally between 60 degrees and 65 degrees, or optionally between 65 degrees and 73 degrees; and 33. An aerosol-generating article according to any one of Examples 29 to 32, wherein at least one of the non-wire side and the wire side of the second wrapper has one or both of a contact angle of 45 degrees to 75 degrees, optionally 45 degrees to 65 degrees, optionally 45 degrees to 60 degrees, optionally 50 degrees to 73 degrees, optionally 50 degrees to 65 degrees, optionally 50 degrees to 60 degrees, optionally 60 degrees to 73 degrees, optionally 60 degrees to 65 degrees, or optionally 65 degrees to 73 degrees. Example 34: An aerosol-generating article according to any one of Examples 1 to 33, wherein the first wrapper and the second wrapper overlap each other, and optionally the second wrapper overlies the first wrapper. Example 35: An aerosol-generating article as described in Example 34, wherein the overlapping length of the first wrapper and the second wrapper in a direction parallel to the longitudinal axis of the article is equal to the length of one or more of the hollow tubular elements. Example 36: An aerosol-generating article described in Example 34 or 35, wherein the overlap length of the first wrapper and the second wrapper in a direction parallel to the longitudinal axis of the article is 5 millimeters or more, optionally 10 millimeters or more, optionally 15 millimeters or more, or optionally 20 millimeters or more. Example 37: An aerosol-generating article described in any one of Examples 34 to 36, wherein the overlap length of the first wrapper and the second wrapper in a direction parallel to the longitudinal axis of the article is 25 millimeters or less, optionally 20 millimeters or less, optionally 15 millimeters or less, or optionally 10 millimeters or less. Example 38: An aerosol-generating article according to any one of Examples 34 to 37, wherein the overlap length of the first wrapper and the second wrapper in a direction parallel to the longitudinal axis of the article is equal to the length of the second wrapper. Example 39: An aerosol-generating article according to any one of Examples 1 to 38, wherein the downstream section extends between the rod of the aerosol-generating substrate and the downstream end of the aerosol-generating article. Example 40: 40. The aerosol-generating article of any one of Examples 1 to 39, wherein the downstream section has a length of 10 millimeters or more, optionally 20 millimeters or more, optionally 25 millimeters or more, optionally 30 millimeters or more, or optionally 40 millimeters or more. Example 41: 41. The aerosol-generating article of any of Examples 1-40, wherein the downstream section has a length of 70 millimeters or less, optionally 60 millimeters or less, optionally 50 millimeters or less, optionally 40 millimeters or less, optionally 30 millimeters or less, optionally 25 millimeters or less, or optionally 20 millimeters or less. Example 42: The downstream section is 10 mm to 70 mm, optionally 10 mm to 60 mm, optionally 10 mm to 50 mm, optionally 10 mm to 40 mm, optionally 10 mm to 30 mm, optionally 10 mm to 25 mm, optionally 10 mm to 20 mm, optionally 20 mm to 70 mm, optionally 20 mm to 60 mm, optionally 20 mm to 50 mm, optionally 20 mm to 40 mm, optionally 20 mm to 30 mm, optionally 20 mm to 25 mm, optionally 25 mm 42. The aerosol-generating article of any one of Examples 1 to 41, having a length of from 25 mm to 70 mm, optionally from 25 mm to 60 mm, optionally from 25 mm to 50 mm, optionally from 25 mm to 40 mm, optionally from 25 mm to 30 mm, optionally from 30 mm to 70 mm, optionally from 30 mm to 60 mm, optionally from 30 mm to 50 mm, optionally from 30 mm to 40 mm, optionally from 40 mm to 70 mm, optionally from 40 mm to 60 mm, or optionally from 40 mm to 50 mm. Example 43: An aerosol-generating article according to any one of Examples 1 to 42, wherein one of the one or more hollow tubular elements of the downstream section abuts the downstream end of the rod of the aerosol-generating substrate. Example 44: An aerosol-generating article described in any of Examples 1 to 43, wherein at least one of the one or more hollow tubular elements is formed from at least one of cardboard, paper, a polymeric material, a cellulosic material, cellulose acetate, low-density polyethylene (LDPE), and a polyhydroxyalkanoate (PHA). Example 45: An aerosol-generating article as described in any of Examples 1 to 44, wherein the one or more hollow tubular elements comprise a hollow tubular cooling element, optionally an upstream end of the hollow tubular cooling element abuts the downstream end of the rod of the aerosol-generating substrate, optionally the hollow tubular cooling element is a cardboard tube, and optionally the hollow tubular cooling element is a flanged cardboard tube. Example 46: An aerosol-generating article according to any one of Examples 1 to 45, wherein the one or more hollow tubular elements comprise a hollow tubular support element, optionally with an upstream end abutting the downstream end of the rod of the aerosol-generating substrate. Example 47: An aerosol-generating article as described in Example 46, wherein the hollow tubular support element is formed from one or more materials selected from the group consisting of cellulose acetate, cardboard, crimped paper such as crimped heat-resistant paper or crimped parchment paper, and polymeric materials such as low-density polyethylene (LDPE). Example 48: An aerosol-generating article as described in any of Examples 1 to 47, wherein one or more hollow tubular elements comprise a hollow tubular support element upstream of the hollow tubular cooling element, and optionally, the upstream end of the hollow tubular cooling element abuts the downstream end of the hollow tubular support element. Example 49: An aerosol-generating article described in any of Examples 1 to 48, wherein the downstream section further comprises a PLA (polylactic acid) plug, optionally comprising crimped PLA, and optionally the PLA plug is downstream of the one or more hollow tubular elements. Example 50: An aerosol-generating article as described in Example 49, wherein the one or more hollow tubular elements comprise a hollow tubular support element upstream of the PLA plug, and optionally, the upstream end of the PLA plug abuts the downstream end of the hollow tubular support element. Example 51: An aerosol-generating article described in any of Examples 1 to 50, wherein the one or more hollow tubular elements comprise a first hollow tubular element and a second hollow tubular element, optionally the second hollow tubular element is arranged downstream of the first hollow tubular element, optionally the inner diameter of the second hollow tubular element is larger than the inner diameter of the first hollow tubular element, optionally the wall thickness of the second hollow tubular element is smaller than the wall thickness of the first hollow tubular element, optionally the first hollow tubular element comprises a hollow acetate tubing (HAT), and optionally the second hollow tubular element comprises a fine hollow acetate tubing (FHAT). Example 52: An aerosol-generating article according to any one of Examples 1 to 51, wherein the downstream section comprises a mouthpiece element. Example 53: An aerosol-generating article as described in Example 52, wherein the mouthpiece element is located downstream of at least one of the one or more hollow tubular elements. Example 54: 54. An aerosol-generating article according to any one of Examples 52 to 53, wherein the mouthpiece element is located at the downstream end of the aerosol-generating article. Example 55: 55. The aerosol-generating article of any one of Examples 52-54, wherein the mouthpiece element is formed from a fibrous filtering material, and optionally, the mouthpiece element is formed from cellulose acetate. Example 56: 56. An aerosol-generating article according to any one of Examples 52 to 55, wherein the aerosol-generating article comprises a flavor capsule, optionally located within the mouthpiece element, and optionally wherein the flavor capsule is crushable. Example 57: 57. An aerosol-generating article according to any one of Examples 1 to 56, wherein the rod of aerosol-generating substrate comprises at least one of nicotine, one or more aerosol formers, and one or more carboxylic acids. Example 58: An aerosol-generating article according to any one of Examples 1 to 57, wherein the rod of the aerosol-generating substrate comprises homogenized tobacco material, and optionally the aerosol-generating substrate comprises an assembly of sheets of homogenized tobacco material, and optionally the homogenized tobacco material is a cast sheet. Example 59: An aerosol-generating article according to any one of Examples 1 to 58, wherein the rod of the aerosol-generating substrate comprises a susceptor element disposed within the rod of the aerosol-generating substrate. Example 60: 60. An aerosol-generating article according to any one of Examples 1 to 59, wherein the aerosol-generating article has an article length of 30 mm to 80 mm, optionally 35 mm to 70 mm, optionally 40 mm to 60 mm, optionally 45 mm to 60 mm, optionally 40 mm to 50 mm, optionally 45 mm to 50 mm, or optionally about 45 mm. Example 61: 61. The aerosol-generating article of any one of Examples 1 to 60, wherein the aerosol-generating article comprises a ventilation zone. Example 62: An aerosol-generating article as described in Example 61, wherein the ventilation zone comprises one or more ventilation holes, optionally arranged in one or more rows provided circumferentially around the article. Example 63: An aerosol-generating article as described in Example 62, wherein one or more vent holes are provided through at least one of the one or more hollow tubular elements. Example 64: 64. The aerosol-generating article of Example 62 or 63, wherein one or more vent holes are provided through one or both of the first wrapper and the second wrapper. Example 65: An aerosol-generating article described in any of Examples 1 to 64, wherein the aerosol-generating article has an article length, the cross-sectional shape of the article is approximately constant along the article length, and optionally the cross-sectional shape of the article is substantially circular, and optionally the article has a width perpendicular to the article length, the width being substantially constant along the entire article length. Example 66: An aerosol-generating article as described in any of Examples 1 to 65, wherein the aerosol-generating article further comprises an upstream section located upstream of the rod of the aerosol-generating substrate, and optionally the upstream section extends between the upstream end of the aerosol-generating article and the rod of the aerosol-generating substrate. Example 67: An aerosol-generating article as described in Example 66, wherein the upstream section comprises one or more upstream elements, and optionally, the one or more upstream elements comprise one or both of a hollow tubular segment and a solid cylindrical plug element having a filled cross-section. Example 68: The aerosol-generating article includes an aerosol-forming section, the aerosol-forming section comprising: a rod of an aerosol-generating substrate; an intermediate section of the aerosol-generating substrate located downstream of the rod, the intermediate section comprising one or more hollow tubular elements, optionally comprising a PLA (polylactic acid) plug; An aerosol-generating article according to any one of Examples 52 to 67, wherein the mouthpiece element is located downstream of the intermediate section. Example 69: 68. The aerosol-generating article of any one of Examples 68 and 66 or 67, wherein the aerosol-forming section further comprises an upstream section. Example 70: An aerosol-generating article described in Example 68 or 69, wherein the first wrapper surrounds at least a portion of the aerosol-forming section, optionally the first wrapper surrounds the aerosol-forming section along the entire length of the aerosol-forming section, and optionally the first wrapper surrounds only the aerosol-forming section. Example 71: 71. The aerosol-generating article of any one of Examples 68-70, wherein a second wrapper surrounds the mouthpiece element, and optionally, the second wrapper surrounds at least a portion of the aerosol-forming section. Example 72: 1. An aerosol generating system comprising: An aerosol-generating article according to any one of Examples 1 to 71, an aerosol generating device configured to heat the aerosol-generating article. Example 73: 73. An aerosol generating system as described in Example 72, wherein the aerosol generating device comprises a device cavity configured to receive at least a portion of the aerosol-generating article. Example 74: An aerosol generating system as described in Example 73, wherein the device cavity has a closed end and an open end, and optionally an aerosol-generating article can be inserted into the device cavity through the open end, and optionally the device cavity has substantially the same cross-sectional shape as the aerosol-generating article. Example 75: 75. The aerosol generation system of any one of Examples 72-74, wherein the aerosol generation device comprises a heating element, and optionally the heating element is one of a resistive heating element and a susceptor element. Example 76: An aerosol generation system described in any one of Examples 72 to 75, wherein the aerosol generation device comprises an inductor coil, optionally at least partially surrounding the device cavity, and optionally the inductor coil is arranged to coaxially surround the device cavity. Example 77: An aerosol generating system described in any one of Examples 72 to 76, wherein the aerosol generating device comprises a heating element in the form of a pin or blade configured for insertion into a rod of the aerosol generating substrate of the aerosol generating article, and optionally the pin or blade comprises one of a resistive heating element and a susceptor element. Example 78: An aerosol generating system as described in Example 77, wherein when the aerosol-generating article is received by the aerosol generating device, the pin or blade penetrates the rod of the aerosol-generating substrate through the center of a cross-sectional surface of the rod substantially perpendicular to the length of the rod. Example 79: An aerosol generation system described in Example 76 and any one of Examples 77 or 78, wherein the pin or blade includes a susceptor element and an inductor coil is arranged to inductively heat the pin or blade. Example 80: An aerosol generating system as described in Example 76 and any one of Examples 72 to 79, wherein the aerosol-generating article comprises a susceptor element disposed within a rod of the aerosol-generating substrate, and an inductor coil of the aerosol generating device is arranged to inductively heat the susceptor element. Example 81: An aerosol generating system described in any one of Examples 72 to 80, wherein the heating element is positioned around the device cavity, optionally surrounding the aerosol generating article when the aerosol generating article is at least partially received within the device cavity, optionally comprising a susceptor element, and optionally an inductor coil of the aerosol generating device arranged to inductively heat the susceptor element.

Claims

1. An aerosol-generating article comprising: a rod of an aerosol-generating substrate; a downstream section of the aerosol-generating substrate located downstream of the rod, the downstream section comprising one or more hollow tubular elements; at least two wrappers, comprising a first wrapper and a second wrapper, each of the first wrapper and the second wrapper surrounding at least one of the rod and the downstream section of the aerosol-generating substrate; the first wrapper and the second wrapper each have a bulk of 1.42 cubic centimeters per gram or less; an aerosol-generating article, wherein the first wrapper and the second wrapper each form at least a portion of an outer surface of the aerosol-generating article;

2. 2. The aerosol-generating article of claim 1, wherein at least one of the first wrapper and the second wrapper has a bulk of 0.75 cubic centimeters per gram or greater.

3. 3. The aerosol-generating article of claim 1, wherein at least one of the first wrapper and the second wrapper has a thickness of 36 micrometers or greater.

4. 4. The aerosol-generating article according to claim 1, wherein at least one of the first wrapper and the second wrapper has a thickness of 90 micrometers or less.

5. 5. The aerosol-generating article according to claim 1, wherein at least one of the first wrapper and the second wrapper has a basis weight of 33.5 grams per square meter or greater.

6. 6. The aerosol-generating article of claim 1, wherein at least one of the first wrapper and the second wrapper has a basis weight of 70 grams per square meter or less.

7. 7. An aerosol-generating article according to any one of claims 1 to 6, wherein the first wrapper has a first wrapper length, the second wrapper has a second wrapper length, the aerosol-generating article has an article length, and at least one of the first wrapper length and the second wrapper length is shorter than the article length.

8. 8. The aerosol-generating article of claim 1, wherein the first wrapper has a first wrapper length and the second wrapper has a second wrapper length, the first wrapper length being longer than the second wrapper length.

9. 9. The aerosol-generating article of claim 1, wherein the first wrapper extends from an upstream end of the article.

10. 10. The aerosol-generating article of claim 1, wherein the second wrapper extends from a downstream end of the article.

11. 11. The aerosol-generating article of any one of claims 1 to 10, wherein at least one of the first wrapper and the second wrapper optionally comprises a cellulosic material selected from one or more of paper, wood, textiles, natural fibers, and man-made fibers.

12. 12. The aerosol-generating article according to any one of claims 1 to 11, wherein one or both of the first wrapper and the second wrapper each have a permeability of 10 Coresta units or less.

13. 13. The aerosol-generating article of any preceding claim, wherein the second wrapper comprises an element printed on a surface of the second wrapper.

14. 1. An aerosol generating system comprising: An aerosol-generating article according to any one of claims 1 to 13; an aerosol generating device configured to heat the aerosol-generating article.

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