Aerosol-generating article having a long rod of aerosol-forming substrate - Patent Application 20070229633

Abstract

An aerosol-generating article (10) comprising a rod (12) of aerosol-forming substrate, a hollow tubular element (20) at a downstream end of the rod (12) of aerosol-forming substrate, and a mouthpiece element (50) at the downstream end of the hollow tubular element (20). The length of the rod (12) of aerosol-forming substrate is at least 30 percent of the length of the aerosol-generating article (10). The rod (12) of aerosol-forming substrate has a tobacco content of 30 percent by weight on a dry weight basis to 90 percent by weight on a dry weight basis. The aerosol-forming substrate (12) has a density of 150 milligrams per cubic centimeter to 500 milligrams per cubic centimeter. The rod (12) of aerosol-forming substrate comprises tobacco cut filler.

Description

[Technical field]

[0001] The present invention relates to an aerosol-generating article that includes an aerosol-forming substrate, which upon heating produces an inhalable aerosol. [Background technology]

[0002] Aerosol-generating articles are known in the art in which an aerosol-forming substrate, such as a tobacco-containing substrate, is heated rather than burned.Typically in such heated smoking articles, aerosol is generated by transferring heat from a heat source to a physically separated aerosol-forming substrate or material, which may be located in contact with, within, around, or downstream of the heat source.During the use of the aerosol-generating article, volatile compounds are released from the aerosol-forming substrate by heat transfer from the heat source and are entrained in the air drawn through the aerosol-generating article.As the released compounds cool, they condense to form an aerosol.

[0003] Numerous prior art documents disclose aerosol generating devices for consuming aerosol-generating articles. Such devices include, for example, electrically heated aerosol generating devices, in which the aerosol is generated by heat transfer from one or more electric heater elements of the aerosol generating device to an aerosol-forming substrate of the heated aerosol-generating article. For example, electrically heated aerosol generating devices have been proposed, which comprise an internal heater blade adapted to be inserted into the aerosol-forming substrate. The use of aerosol-generating articles in combination with external heating systems is also known. For example, WO2020 / 115151 describes the provision of one or more heating elements arranged around the periphery of the aerosol-generating article when the aerosol-generating article is received in a cavity of the aerosol generating device. Alternatively, an inductively heatable aerosol-generating article is proposed by WO2015 / 1768598, which comprises an aerosol-forming substrate and a susceptor disposed within the aerosol-forming substrate. Summary of the Invention [Problem to be solved by the invention]

[0004] Aerosol-generating articles in which the tobacco-containing substrate is heated rather than combusted present a number of challenges not found in conventional smoking articles.

[0005] For example, with some aerosol-forming substrates, it may be difficult to deliver sufficient aerosol to the user. This may be particularly true for aerosol-forming substrates that contain a relatively high proportion of non-tobacco components.

[0006] It would be desirable to provide new and improved aerosol-generating articles. [Means for solving the problem]

[0007] An aerosol-generating article is provided. The aerosol-generating article may comprise a rod of aerosol-forming substrate. The aerosol-generating article may comprise a hollow tubular element at a downstream end of the rod of aerosol-forming substrate. The aerosol-generating article may comprise a mouthpiece element at a downstream end of the hollow tubular element. The length of the rod of aerosol-forming substrate may be at least 30 percent of the length of the aerosol-generating article. The rod of aerosol-forming substrate may have a tobacco content of between 30 percent by weight on a dry weight basis and 90 percent by weight on a dry weight basis.

[0008] Also provided is an aerosol-generating article comprising a rod of aerosol-forming substrate, a hollow tubular element at a downstream end of the rod of aerosol-forming substrate, and a mouthpiece element at the downstream end of the hollow tubular element, wherein the length of the rod of aerosol-forming substrate is at least 30 percent of the length of the aerosol-generating article, and the rod of aerosol-forming substrate has a tobacco content of between 30 percent by weight on a dry weight basis and 90 percent by weight on a dry weight basis.

[0009] Also provided is an aerosol generating system. The aerosol generating system may comprise an aerosol-generating article. The aerosol-generating article may comprise a rod of an aerosol-forming substrate. The aerosol-generating article may comprise a hollow tubular element at a downstream end of the rod of the aerosol-forming substrate. The aerosol-generating article may comprise a mouthpiece element at a downstream end of the hollow tubular element. The length of the rod of the aerosol-forming substrate may be at least 30 percent of the length of the aerosol-generating article. The rod of the aerosol-forming substrate may have a tobacco content of between 30 percent by weight on a dry weight basis and 90 percent by weight on a dry weight basis. The aerosol generating system may comprise an aerosol generating device. The aerosol generating device comprises a heating chamber for receiving the aerosol-generating article. The aerosol generating device may comprise a heating element. The heating element may have a length less than the length of the rod of the aerosol-forming substrate.

[0010] There is also provided an aerosol generating system comprising an aerosol-generating article and an aerosol generating device, the aerosol-generating article comprising a rod of aerosol-forming substrate, a hollow tubular element at a downstream end of the rod of aerosol-forming substrate, and a mouthpiece element at the downstream end of the hollow tubular element, the length of the rod of aerosol-forming substrate being at least 30 percent of the length of the aerosol-generating article, the rod of aerosol-forming substrate having a tobacco content of between 30 percent by weight on a dry weight basis and 90 percent by weight on a dry weight basis, and the aerosol generating device comprising a heating chamber for receiving the aerosol-generating article and a heating element, the heating element having a length shorter than the length of the rod of aerosol-forming substrate.

[0011] In some aerosol-generating articles, it may be desirable to include components and aerosol formers other than tobacco within the rod of the aerosol-forming substrate, for example, it may be desirable to include one or more flavorants within the rod of the aerosol-forming substrate.

[0012] The term "flavorant" refers to an organoleptic compound, composition, or material that modifies and is intended to modify the taste or aroma characteristics of one or more components of the aerosol-forming substrate during consumption or inhalation. A flavorant may, for example, modify and / or be intended to modify the taste or aroma characteristics of nicotine during consumption or inhalation. For purposes of this disclosure, nicotine is not considered a "flavorant" or flavor.

[0013] However, replacing a portion of the tobacco in the rod of an aerosol-forming substrate with a flavorant reduces the amount of tobacco in the rod and therefore reduces the amount of nicotine that can be delivered to the user, which can reduce the overall length of the experience provided to the user.

[0014] Advantageously, increasing the length of the rod of the aerosol-forming substrate relative to the overall length of the aerosol-generating article provides an aerosol-generating article with more aerosol-forming substrate compared to a conventional aerosol-generating article of the same size and shape. The increased amount of aerosol-forming substrate may have more tobacco, which may allow for more nicotine to be delivered to the user while maintaining the same size and shape of the aerosol-generating article. This configuration may allow an aerosol-generating article to have an aerosol-forming substrate that contains other components, such as flavorants, while still having the ability to deliver to the user what the user perceives as a normal amount of nicotine.

[0015] Additionally, having a larger aerosol-forming substrate may provide a longer user experience.

[0016] Additionally, by keeping the overall length and diameter of the aerosol-generating article the same, the aerosol-generating article can still be used in conventional aerosol generating devices.

[0017] The length of the rod of the aerosol-forming substrate may be at least 31 percent of the length of the aerosol-generating article. The length of the rod of the aerosol-forming substrate may be at least 33 percent of the length of the aerosol-generating article. The length of the rod of the aerosol-forming substrate may be at least 35 percent of the length of the aerosol-generating article. The length of the rod of the aerosol-forming substrate may be at least 37 percent of the length of the aerosol-generating article. The length of the rod of the aerosol-forming substrate may be at least 38 percent of the length of the aerosol-generating article.

[0018] The length of the aerosol-forming substrate rod may be 45 percent or less of the length of the aerosol-generating article. The length of the aerosol-forming substrate rod may be 43 percent or less of the length of the aerosol-generating article. The length of the aerosol-forming substrate rod may be 41 percent or less of the length of the aerosol-generating article. The length of the aerosol-forming substrate rod may be 39 percent or less of the length of the aerosol-generating article.

[0019] The length of the rod of the aerosol-forming substrate may be 30 to 45 percent of the length of the aerosol-generating article. The length of the rod of the aerosol-forming substrate may be 31 to 43 percent of the length of the aerosol-generating article. The length of the rod of the aerosol-generating substrate may be 33 to 41 percent of the length of the aerosol-generating article. The length of the rod of the aerosol-forming substrate may be 35 to 39 percent of the length of the aerosol-generating article. The length of the rod of the aerosol-generating substrate may be 37 to 39 percent of the length of the aerosol-generating article.

[0020] The rod of the aerosol-forming substrate may have a length of at least 10 millimeters. The rod of the aerosol-forming substrate may have a length of at least 12 millimeters. The rod of the aerosol-forming substrate may have a length of at least 14 millimeters. The rod of the aerosol-forming substrate may have a length of at least 16 millimeters.

[0021] The rod of the aerosol-forming substrate may have a length of 22 millimeters or less. The rod of the aerosol-forming substrate may have a length of 20 millimeters or less. The rod of the aerosol-forming substrate may have a length of 18 millimeters or less. The rod of the aerosol-forming substrate may have a length of 16 millimeters or less.

[0022] The rod of the aerosol-forming substrate may have a length between 14 mm and 20 mm.The rod of the aerosol-forming substrate may have a length between 16 mm and 18 mm.

[0023] In one embodiment, the rod of aerosol-forming substrate has a length of 17 millimeters.

[0024] The rod of the aerosol-forming substrate may have a tobacco content of at least 30 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of at least 35 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of at least 40 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of at least 45 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of at least 50 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of at least 55 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of at least 60 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of at least 65 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of at least 70 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of at least 75 percent by weight on a dry weight basis.

[0025] The rod of the aerosol-forming substrate may have a tobacco content of 90 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 85 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 80 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 75 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 70 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 65 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 60 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 55 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 50 percent or less by weight on a dry weight basis.

[0026] The rod of the aerosol-forming substrate may have a tobacco content of 35 percent on a dry weight basis to 90 percent on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 40 percent on a dry weight basis to 85 percent on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 45 percent on a dry weight basis to 80 percent on a dry weight basis. The rod of the aerosol-forming substrate may have a tobacco content of 50 percent on a dry weight basis to 80 percent on a dry weight basis.

[0027] The rod of aerosol-forming substrate may comprise one of a number of flavourants.The rod of aerosol-forming substrate may comprise a number of flavourants.

[0028] The rod of the aerosol-forming substrate may have a flavourant content of at least 0.1 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of at least 1 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of at least 3 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of at least 5 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of at least 8 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of at least 10 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of at least 13 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of at least 15 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of at least 18 percent by weight on a dry weight basis.

[0029] The rod of the aerosol-forming substrate may have a flavourant content of 25 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 20 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 18 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 15 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 13 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 10 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 8 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 5 percent by weight or less on a dry weight basis.

[0030] The rod of the aerosol-forming substrate may have a flavourant content of 0.1 to 25 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 0.1 to 20 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 5 to 20 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 10 to 20 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a flavourant content of 15 to 20 percent by weight on a dry weight basis.

[0031] The one or more flavorings may be one or more of clove, ginger, mint, rosemary, star anise, and tea. The plurality of flavorings may be a combination of two or more of clove, ginger, mint, rosemary, star anise, and tea.

[0032] In one embodiment, the rod of aerosol-forming substrate may comprise a clove.

[0033] The rod of the aerosol-forming substrate may have a clove content of at least 0.1 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of at least 1 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of at least 3 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of at least 5 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of at least 8 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of at least 10 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of at least 13 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of at least 15 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of at least 18 percent by weight on a dry weight basis.

[0034] The rod of the aerosol-forming substrate may have a clove content of 25 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 20 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 18 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 15 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 13 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 10 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 8 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 5 percent or less by weight on a dry weight basis.

[0035] The rod of the aerosol-forming substrate may have a clove content of 0.1 to 25 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 0.1 to 20 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 5 to 20 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 10 to 20 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove content of 15 to 20 percent by weight on a dry weight basis.

[0036] The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of at least 0.1 weight percent on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of at least 1 weight percent on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of at least 3 weight percent on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of at least 5 weight percent on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of at least 8 weight percent on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of at least 10 weight percent on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of at least 13 percent by weight on a dry weight basis.The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of at least 15 percent by weight on a dry weight basis.The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of at least 18 percent by weight on a dry weight basis.

[0037] The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 25 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 20 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 18 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 15 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 13 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 10 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 8 percent or less by weight on a dry weight basis.The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 5 percent or less by weight on a dry weight basis.

[0038] The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 0.1 weight percent to 25 weight percent on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 0.1 weight percent to 20 weight percent on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 5 weight percent to 20 weight percent on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 10 weight percent to 20 weight percent on a dry weight basis. The rod of the aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise and tea content of 15 weight percent to 20 weight percent on a dry weight basis.

[0039] The rod of the aerosol-forming substrate may comprise at least 30 milligrams of flavourant. The rod of the aerosol-forming substrate may comprise at least 35 milligrams of flavourant. The rod of the aerosol-forming substrate may comprise at least 40 milligrams of flavourant. The rod of the aerosol-forming substrate may comprise at least 45 milligrams of flavourant. The rod of the aerosol-forming substrate may comprise at least 50 milligrams of flavourant.

[0040] The rod of the aerosol-forming substrate may contain 75 milligrams or less of flavourant. The rod of the aerosol-forming substrate may contain 70 milligrams or less of flavourant. The rod of the aerosol-forming substrate may contain 65 milligrams or less of flavourant. The rod of the aerosol-forming substrate may contain 60 milligrams or less of flavourant. The rod of the aerosol-forming substrate may contain 55 milligrams or less of flavourant.

[0041] A rod of the aerosol-forming substrate may contain between 30 milligrams and 75 milligrams of flavourant. A rod of the aerosol-forming substrate may contain between 35 milligrams and 70 milligrams of flavourant. A rod of the aerosol-forming substrate may contain between 40 milligrams and 65 milligrams of flavourant. A rod of the aerosol-forming substrate may contain between 45 milligrams and 60 milligrams of flavourant. A rod of the aerosol-forming substrate may contain between 50 milligrams and 55 milligrams of flavourant.

[0042] The rod of the aerosol-forming substrate may comprise at least 30 milligrams of cloves. The rod of the aerosol-forming substrate may comprise at least 35 milligrams of cloves. The rod of the aerosol-forming substrate may comprise at least 40 milligrams of cloves. The rod of the aerosol-forming substrate may comprise at least 45 milligrams of cloves. The rod of the aerosol-forming substrate may comprise at least 50 milligrams of cloves.

[0043] The rod of the aerosol-forming substrate may contain 75 milligrams or less of cloves. The rod of the aerosol-forming substrate may contain 70 milligrams or less of cloves. The rod of the aerosol-forming substrate may contain 65 milligrams or less of cloves. The rod of the aerosol-forming substrate may contain 60 milligrams or less of cloves. The rod of the aerosol-forming substrate may contain 55 milligrams or less of cloves.

[0044] The rod of the aerosol-forming substrate may contain between 30 milligrams and 75 milligrams of cloves. The rod of the aerosol-forming substrate may contain between 35 milligrams and 70 milligrams of cloves. The rod of the aerosol-forming substrate may contain between 40 milligrams and 65 milligrams of cloves. The rod of the aerosol-forming substrate may contain between 45 milligrams and 60 milligrams of cloves. The rod of the aerosol-forming substrate may contain between 50 milligrams and 55 milligrams of cloves.

[0045] The rod of the aerosol-forming substrate may comprise at least 30 milligrams of cloves, ginger, mint, rosemary, star anise, and tea. The rod of the aerosol-forming substrate may comprise at least 35 milligrams of cloves, ginger, mint, rosemary, star anise, and tea. The rod of the aerosol-forming substrate may comprise at least 40 milligrams of cloves, ginger, mint, rosemary, star anise, and tea. The rod of the aerosol-forming substrate may comprise at least 45 milligrams of cloves, ginger, mint, rosemary, star anise, and tea. The rod of the aerosol-forming substrate may comprise at least 50 milligrams of cloves, ginger, mint, rosemary, star anise, and tea.

[0046] The rod of the aerosol-forming substrate may contain 75 milligrams or less of cloves, ginger, mint, rosemary, star anise, and tea. The rod of the aerosol-forming substrate may contain 70 milligrams or less of cloves, ginger, mint, rosemary, star anise, and tea. The rod of the aerosol-forming substrate may contain 65 milligrams or less of cloves, ginger, mint, rosemary, star anise, and tea. The rod of the aerosol-forming substrate may contain 60 milligrams or less of cloves, ginger, mint, rosemary, star anise, and tea. The rod of the aerosol-forming substrate may contain 55 milligrams or less of cloves, ginger, mint, rosemary, star anise, and tea.

[0047] A rod of the aerosol-forming substrate may contain 30 milligrams to 75 milligrams of cloves, ginger, mint, rosemary, star anise, and tea. A rod of the aerosol-forming substrate may contain 35 milligrams to 70 milligrams of cloves, ginger, mint, rosemary, star anise, and tea. A rod of the aerosol-forming substrate may contain 40 milligrams to 65 milligrams of cloves, ginger, mint, rosemary, star anise, and tea. A rod of the aerosol-forming substrate may contain 45 milligrams to 60 milligrams of cloves, ginger, mint, rosemary, star anise, and tea. A rod of the aerosol-forming substrate may contain 50 milligrams to 55 milligrams of cloves, ginger, mint, rosemary, star anise, and tea.

[0048] The rod of the aerosol-forming substrate may comprise one or more aerosol formers.The rod of the aerosol-forming substrate may comprise a plurality of aerosol formers.

[0049] The aerosol former can be any suitable known compound or mixture of compounds that promotes the formation of a dense and 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 are, for example, polyhydric alcohols (e.g., triethylene glycol, 1,3-butanediol, propylene glycol, glycerin, etc.), esters of polyhydric alcohols (e.g., glycerol mono-, di-, or triacetate, etc.), aliphatic esters of mono-, di-, or polycarboxylic acids (e.g., dimethyl dodecanedioate, dimethyl tetradecanedioate, etc.), and combinations thereof.

[0050] The aerosol former may comprise glycerin. The aerosol former may comprise propylene glycol. The aerosol former may be comprised of glycerin. The aerosol former may be comprised of propylene glycol. The aerosol former may comprise a combination of glycerin and propylene glycol. The aerosol former may be comprised of a combination of glycerin and propylene glycol.

[0051] The rod of the aerosol-forming substrate may have an aerosol former content of at least 5 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have an aerosol former content of at least 10 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have an aerosol former content of at least 15 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have an aerosol former content of at least 20 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have an aerosol former content of at least 25 percent by weight on a dry weight basis.

[0052] The rod of the aerosol-forming substrate may have an aerosol former content of 30 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have an aerosol former content of 25 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have an aerosol former content of 20 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have an aerosol former content of 15 percent by weight or less on a dry weight basis. The rod of the aerosol-forming substrate may have an aerosol former content of 10 percent by weight or less on a dry weight basis.

[0053] The rod of the aerosol-forming substrate may have a glycerin content of at least 5 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a glycerin content of at least 10 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a glycerin content of at least 15 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a glycerin content of at least 20 percent by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a glycerin content of at least 25 percent by weight on a dry weight basis.

[0054] The rod of the aerosol-forming substrate may have a glycerin content of 30 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a glycerin content of 25 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a glycerin content of 20 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a glycerin content of 15 percent or less by weight on a dry weight basis. The rod of the aerosol-forming substrate may have a glycerin content of 10 percent or less by weight on a dry weight basis.

[0055] The aerosol-generating article may have a length of at least 38 millimeters.The aerosol-generating article may have a length of at least 40 millimeters.The aerosol-generating article may have a length of at least 42 millimeters.

[0056] The aerosol-generating article may have a length of 70 millimeters or less. The aerosol-generating article may have a length of 60 millimeters or less. The aerosol-generating article may have a length of 50 millimeters or less. The aerosol-generating article may have a length of 45 millimeters or less. The aerosol-generating article may have a length of 45 millimeters.

[0057] The aerosol-generating article may have a length of 38 mm to 70 mm. The aerosol-generating article may have a length of 38 mm to 60 mm. The aerosol-generating article may have a length of 40 mm to 50 mm. The aerosol-generating article may have a length of 42 mm to 48 mm. The aerosol-generating article may have a length of 44 mm to 46 mm.

[0058] The aerosol-generating article may have an outer diameter of at least 5 millimeters.The aerosol-generating article may have an outer diameter of at least 6 millimeters.The aerosol-generating article may have an outer diameter of at least 7 millimeters.

[0059] The aerosol-generating article may have an outer diameter of 12 millimeters or less.The aerosol-generating article may have an outer diameter of 10 millimeters or less.The aerosol-generating article may have an outer diameter of 8 millimeters or less.

[0060] The aerosol-generating article may have an outer diameter of between 5 millimeters and 12 millimeters.The aerosol-generating article may have an outer diameter of between 6 millimeters and 10 millimeters.The aerosol-generating article may have an outer diameter of between 7 millimeters and 8 millimeters.

[0061] The outer diameter of the aerosol-generating article may be substantially constant over the entire length of the aerosol-generating article, or alternatively, different portions of the aerosol-generating article may have different outer diameters.

[0062] The hollow tubular element may have a length of at least 15 millimeters.The hollow tubular element may have a length of at least 17 millimeters.The hollow tubular element may have a length of at least 19 millimeters.

[0063] The hollow tubular element may have a length of 30 millimeters or less.The hollow tubular element may have a length of 25 millimeters or less.The hollow tubular element may have a length of 23 millimeters or less.

[0064] The hollow tubular element may have a length between 15 mm and 30 mm. The hollow tubular element may have a length between 17 mm and 25 mm. The hollow tubular element may have a length between 19 mm and 23 mm. In one embodiment, the hollow tubular element has a length of 12 mm.

[0065] A relatively long hollow tubular element may provide and define a relatively long internal cavity within the aerosol-generating article and downstream of the rod of the aerosol-forming substrate. Providing an empty cavity downstream (preferably immediately downstream) of the aerosol-forming substrate may enhance nucleation of the aerosol particles generated by the substrate. Providing a relatively long cavity maximizes the benefits of such nucleation, thereby improving aerosol formation and cooling.

[0066] The peripheral wall thickness (in other words the wall thickness) of the hollow tubular element may be at least 100 micrometers. The wall thickness of the hollow tubular element may be at least 150 micrometers. The wall thickness of the hollow tubular element may be at least 200 micrometers. The wall thickness of the hollow tubular element may be at least 250 micrometers. The wall thickness of the hollow tubular element may be at least 500 micrometers.

[0067] The wall thickness of the hollow tubular element may be 2 millimeters or less. The wall thickness of the hollow tubular element may be 1.5 millimeters or less. The wall thickness of the hollow tubular element may be 1.25 millimeters or less. The wall thickness of the hollow tubular element may be 1 millimeter or less. The wall thickness of the hollow tubular element may be 500 micrometers or less.

[0068] The wall thickness of the hollow tubular element may be between 100 micrometers and 2 millimeters. The wall thickness of the hollow tubular element may be between 150 micrometers and 1.5 millimeters. The wall thickness of the hollow tubular element may be between 200 micrometers and 1.25 millimeters.

[0069] The wall thickness of the hollow tubular element may be 250 micrometers.

[0070] By keeping the thickness of the peripheral wall of the hollow tubular element relatively low - which is possible because the aerosol starts the nucleation process as soon as the aerosol components leave the rod of the aerosol-forming substrate - it can be ensured that the overall internal volume of the hollow tubular segment and the cross-sectional area of ​​the hollow tubular segment are effectively maximized, while at the same time ensuring that the hollow tubular segment has the necessary structural strength to prevent the collapse of the aerosol-generating article and provide some support to the rod of the aerosol-forming substrate, and that the resistance to pulling the hollow tubular element is minimized. It can be understood that a larger value of the cross-sectional surface area of ​​the cavity of the hollow tubular element is associated with a reduced speed of the aerosol flow along the aerosol-generating article, which is also expected to be favorable for the nucleation of the aerosol. Furthermore, by utilizing a hollow tubular element with a relatively small thickness, it can be possible to substantially prevent the diffusion of the ventilation air before it contacts and mixes with the aerosol flow, which is also understood to be more favorable for the nucleation phenomenon. Indeed, by providing a more controllably localized cooling of the stream of volatilized species, it may be possible to enhance the cooling effect on the formation of new aerosol particles.

[0071] The hollow tubular element may have an outer diameter approximately equal to the outer diameter of the rod of the aerosol-forming substrate and the outer diameter of the aerosol-generating article.

[0072] The hollow tubular element may have an outer diameter of 5 millimeters to 12 millimeters. The hollow tubular element may have an outer diameter of 5 millimeters to 10 millimeters. The hollow tubular element may have an outer diameter of 6 millimeters to 8 millimeters. The hollow tubular element may have an outer diameter of 7.2 millimeters plus or minus 10 percent.

[0073] The hollow tubular element may have an inner diameter. The hollow tubular element may have a constant inner diameter along the length of the hollow tubular element. However, the inner diameter of the hollow tubular element may vary along the length of the hollow tubular element.

[0074] The hollow tubular element may have an internal diameter of at least 2 millimeters. The hollow tubular element may have an internal diameter of at least 4 millimeters. The hollow tubular element may have an internal diameter of at least 5 millimeters. The hollow tubular element may have an internal diameter of at least 7 millimeters.

[0075] Providing a hollow tubular element with an inner diameter as set out above may advantageously provide the hollow tubular element with sufficient stiffness and strength.

[0076] The hollow tubular element may have an inner diameter of about 10 millimeters or less. For example, the hollow tubular element may have an inner diameter of about 9 millimeters or less. The hollow tubular element may have an inner diameter of about 8 millimeters or less. The hollow tubular element may have an inner diameter of about 7.5 millimeters or less.

[0077] By providing the hollow tubular element with an inner diameter as described above, the resistance to withdrawal of the hollow tubular segment may be advantageously reduced.

[0078] The hollow tubular element may have an inner diameter of from 2 millimeters to about 10 millimeters. The hollow tubular element may have an inner diameter of from 4 millimeters to about 9 millimeters. The hollow tubular element may have an inner diameter of from 5 millimeters to about 8 millimeters. The hollow tubular element may have an inner diameter of from 6 millimeters to about 7.5 millimeters.

[0079] The hollow tubular element may have an outer diameter of about 7.1 or 7.2 millimeters. The hollow tubular element may have an inner diameter of 6.7 millimeters.

[0080] The hollow tubular element may comprise cardboard. The hollow tubular element may be a cardboard tube. The hollow tubular element may be formed from cardboard. Advantageously, cardboard is a cost-effective material that offers 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 offer adequate resistance to deformation or compression during use.

[0081] The hollow tubular element may be a paper tube. The hollow tubular element may be a tube formed from spirally wound paper. The hollow tubular element may be formed from multiple layers of paper. The paper may have a basis weight of about 50 grams per square meter, at least about 60 grams per square meter, at least about 70 grams per square meter, or at least about 90 grams per square meter.

[0082] The hollow tubular element may comprise a polymeric material. For example, the hollow tubular element may comprise a polymeric film. The polymeric film may comprise a cellulose film. The hollow tubular element may comprise low density polyethylene (LDPE) or polyhydroxyalkanoate (PHA) fibers. The hollow tubular element may comprise cellulose acetate tow.

[0083] The mouthpiece element may be located at a downstream end of the aerosol-generating article. The downstream end of the mouthpiece element may define the downstream end of the aerosol-generating article.

[0084] A mouthpiece element may be provided downstream of the rod of aerosol-forming substrate. The mouthpiece element may extend all the way to the mouth end of the aerosol-generating article. The mouthpiece element may comprise at least one mouthpiece filter segment formed from a fibrous filtration material. The mouthpiece element may be located downstream of the hollow tubular element, as described above. The mouthpiece element may extend between the hollow tubular element and the downstream end of the aerosol-generating article.

[0085] Parameters or characteristics described in relation to the mouthpiece element as a whole may be equally applied to the mouthpiece filter segment of the mouthpiece element.

[0086] The fibrous filtration material may be for filtering the aerosol generated from the aerosol-forming substrate. Suitable fibrous filtration materials will be known to those skilled in the art. At least one of the mouthpiece filter segments may comprise a cellulose acetate filter segment formed from cellulose acetate tow.

[0087] The mouthpiece element may be comprised of a single mouthpiece filter segment. The mouthpiece element may include two or more mouthpiece filter segments. The two or more mouthpiece filter elements may be axially aligned in abutting end-to-end relationship with one another.

[0088] The mouthpiece element may include a flavorant. The flavorant may be provided in any suitable form. For example, the mouthpiece element may comprise one or more capsules, beads, or granules of flavorant, or one or more threads or filaments loaded with flavor.

[0089] The mouthpiece element may have a low particulate filtration efficiency. The mouthpiece filter segment may have a low particulate filtration efficiency.

[0090] The mouthpiece element may be surrounded by a plug wrap. The mouthpiece element may be non-ventilated so that air does not enter the aerosol-generating article along the mouthpiece element.

[0091] The mouthpiece element may be connected to one or more of the adjacent upstream components of the aerosol-generating article by a tipping wrapper.

[0092] The mouthpiece element may have an outer diameter approximately equal to the outer diameter of the aerosol-generating article. The diameter of the mouthpiece element (or mouthpiece filter segment) may be substantially the same as the outer diameter of the hollow tubular element. As discussed in this disclosure, the outer diameter of the hollow tubular element may be approximately 7.2 millimeters plus or minus 10 percent.

[0093] The mouthpiece element may have a length of at least 3 millimeters.The mouthpiece element may have a length of at least 5 millimeters.

[0094] The mouthpiece element may have a length of 11 millimeters or less.The mouthpiece element may have a length of 9 millimeters or less.The mouthpiece element may have a length of 7 millimeters or less.

[0095] The mouthpiece element may have a length between 3mm and 11mm.The mouthpiece element may have a length between 5mm and 9mm.

[0096] The mouthpiece element may have a length of 7 millimeters.

[0097] The mouthpiece element may have an outer diameter of 5 millimeters to 10 millimeters. The mouthpiece element may have an outer diameter of 6 millimeters to 8 millimeters. The mouthpiece element may have an outer diameter of 7 millimeters to 8 millimeters. The mouthpiece element may have an outer diameter of 7.2 millimeters plus or minus 10 percent. The mouthpiece element may have an outer diameter of 7.25 millimeters plus or minus 10 percent.

[0098] The aerosol-generating article may include a ventilation zone, which may be located at a position along the hollow tubular element.

[0099] The distance between the ventilation zone and the upstream end of the aerosol-generating article may be at least 26 millimeters. The distance between the ventilation zone and the upstream end of the aerosol-generating article may be at least 28 millimeters. The distance between the ventilation zone and the upstream end of the aerosol-generating article may be at least 30 millimeters.

[0100] The distance between the ventilation zone and the upstream end of the aerosol-generating article may be no more than 33 millimeters.The distance between the ventilation zone and the upstream end of the aerosol-generating article may be no more than 31 millimeters.

[0101] The distance between the ventilation zone and the upstream end of the aerosol-generating article may be between 26 millimeters and 33 millimeters.The distance between the ventilation zone and the upstream end of the aerosol-generating article may be between 28 millimeters and 31 millimeters.

[0102] Such, or any, ventilation zone may extend through the peripheral wall of the hollow tubular element, thus establishing fluid communication between the flow channel defined internally by the hollow tubular element and the external environment.

[0103] Unless otherwise specified, the resistance to draw (RTD) of a component or aerosol-generating article is measured in accordance with ISO 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." These terms generally refer to measurements in accordance with ISO 6565-2015 being performed normally under test at a temperature of about 22 degrees Celsius, a pressure of about 101 kPa (about 760 Torr), and a relative humidity of about 60%, with a volumetric flow rate of about 17.5 milliliters per second at the output or downstream end of the component being measured.

[0104] In the context of the present invention, the hollow tubular element provides an unrestricted flow channel. This means that the hollow tubular element provides a negligible level of resistance to withdrawal (RTD). The term "negligible resistance to withdrawal" is used to describe a resistance to withdrawal of less than 1 mmH2O per 10 mm of the length of the hollow tubular element, preferably less than 0.4 mmH2O per 10 mm of the length of the hollow tubular element, more preferably less than 0.1 mmH2O per 10 mm of the length of the hollow tubular element.

[0105] Preferably, the resistance to withdrawal of the hollow tubular element is about 10 millimeters of H2O or less. More preferably, the resistance to withdrawal of the hollow tubular element is about 5 millimeters of H2O or less. Even more preferably, the resistance to withdrawal of the hollow tubular element is about 2.5 millimeters of H2O or less. Even more preferably, the resistance to withdrawal of the hollow tubular element is about 2 millimeters of H2O or less. Even more preferably, the resistance to withdrawal of the hollow tubular element is about 1 millimeter of H2O or less.

[0106] The resistance to withdrawal of the hollow tubular element can be at least 0 millimeters of H2O, or at least about 0.25 millimeters of H2O, or at least about 0.5 millimeters of H2O, or at least about 1 millimeter of H2O.

[0107] The resistance to drawing of the hollow tubular element can be from about 0 millimeters HO to about 10 millimeters HO, preferably from about 0.25 millimeters HO to about 10 millimeters HO, preferably from about 0.5 millimeters HO to about 10 millimeters HO.

[0108] The resistance to drawing of the hollow tubular element can be from about 0 millimeters HO to about 5 millimeters HO, preferably from about 0.25 millimeters HO to about 5 millimeters HO, preferably from about 0.5 millimeters HO to about 5 millimeters HO.

[0109] The resistance to drawing of the hollow tubular element can be from about 1 mm H2O to about 5 mm H2O. The resistance to drawing of the hollow tubular element can be from about 0 mm H2O to about 2.5 mm H2O, preferably from about 0.25 mm H2O to about 2.5 mm H2O, and more preferably from about 0.5 mm H2O to about 2.5 mm H2O.

[0110] The resistance to drawing of the hollow tubular element can be from about 0 millimeters H2O to about 2 millimeters H2O, preferably from about 0.25 millimeters H2O to about 2 millimeters H2O, and more preferably from about 0.5 millimeters H2O to about 2 millimeters H2O.

[0111] In one embodiment, the resistance to withdrawal of the hollow tubular element is about 0 millimeters H2O.

[0112] The hollow tubular element may provide a withdrawal resistance of 1 mmH2O or less.

[0113] The resistance to draw (RTD) of the mouthpiece element may be at least about 0 mmH2O. The resistance to draw of the mouthpiece element may be at least about 3 mmH2O. The RTD of the mouthpiece element may be at least about 6 mmH2O.

[0114] The resistance to withdrawal of the mouthpiece element may be about 12 mmH2O or less. The resistance to withdrawal of the mouthpiece element may be about 11 mmH2O or less. The resistance to withdrawal of the mouthpiece element may be about 10 mmH2O or less.

[0115] The resistance to withdrawal of the mouthpiece element may be about 0 mmH2O or more and less than about 12 mmH2O. Preferably, the resistance to withdrawal of the mouthpiece element may be about 3 mmH2O or more and less than about 12 mmH2O. The resistance to withdrawal of the mouthpiece element may be about 0 mmH2O or more and less than about 11 mmH2O. Even more preferably, the resistance to withdrawal of the mouthpiece element may be about 3 mmH2O or more and less than about 11 mmH2O. Even more preferably, the resistance to withdrawal of the mouthpiece element may be about 6 mmH2O or more and less than about 10 mmH2O. Preferably, the resistance to withdrawal of the mouthpiece element may be about 8 mmH2O.

[0116] The mouthpiece element or mouthpiece filter segment may be formed of a fibrous material. The mouthpiece element may be formed of a porous material. The mouthpiece element may be formed of a biodegradable material. The mouthpiece element may be formed of a cellulosic material, such as cellulose acetate. For example, the mouthpiece element may be formed of a bundle of cellulose acetate fibers having about 10 to about 15 denier per filament. For example, the mouthpiece element may be formed of a relatively low density cellulose acetate tow, such as a cellulose acetate tow containing about 12 denier fibers per filament.

[0117] The mouthpiece element may be made of a polylactic acid-based material. The mouthpiece element may be made of a bioplastic material, preferably a starch-based bioplastic material. The mouthpiece element may be made by injection molding or extrusion. Bioplastic-based materials are advantageous because they can provide a simple and inexpensive mouthpiece element structure to manufacture with a specific and complex cross-sectional profile that may include multiple relatively large airflow channels extending through the material of the mouthpiece element, providing suitable RTD characteristics.

[0118] The mouthpiece elements may be formed from sheets of suitable material that are crimped, pleated, assembled, woven, or folded into elements that define a plurality of longitudinally extending channels. Such sheets of suitable material may be formed of paper, cardboard, polymers such as polylactic acid, or any other cellulosic, paper, or bioplastic-based material. The cross-sectional profile of such mouthpiece elements may exhibit randomly oriented channels.

[0119] The mouthpiece element may be formed in any other suitable manner. For example, the mouthpiece element may be formed from a bundle of longitudinally extending tubes. The longitudinally extending tubes may be formed from polylactic acid. The mouthpiece element may be formed by extrusion, molding, lamination, injection molding, or shredding of a suitable material. Therefore, it is preferred that there is a low pressure drop (or RTD) from the upstream end of the mouthpiece element to the downstream end of the mouthpiece element.

[0120] The rod of aerosol-forming substrate may be the upstream most part of the aerosol-generating article.

[0121] The aerosol-forming substrate may have a density of at least 150 milligrams per cubic centimeter. The aerosol-forming substrate may have a density of at least 175 milligrams per cubic centimeter. The aerosol-forming substrate may have a density of at least 200 milligrams per cubic centimeter. The aerosol-forming substrate may have a density of at least 250 milligrams per cubic centimeter.

[0122] The aerosol-forming substrate may have a density of at least 500 milligrams per cubic centimeter or less. The aerosol-forming substrate may have a density of at least 450 milligrams per cubic centimeter or less. The aerosol-forming substrate may have a density of at least 400 milligrams per cubic centimeter or less. The aerosol-forming substrate may have a density of at least 350 milligrams per cubic centimeter or less.

[0123] The aerosol-forming substrate may have a density of 150 milligrams / cubic centimeter to 500 milligrams / cubic centimeter. The aerosol-forming substrate may have a density of 175 milligrams / cubic centimeter to 450 milligrams / cubic centimeter. The aerosol-forming substrate may have a density of 200 milligrams / cubic centimeter to 400 milligrams / cubic centimeter. The aerosol-forming substrate may have a density of 250 milligrams / cubic centimeter to 350 milligrams / cubic centimeter.

[0124] The aerosol-forming substrate may comprise at least 80 milligrams of the aerosol-forming substrate. The aerosol-forming substrate may comprise at least 100 milligrams of the aerosol-forming substrate. The aerosol-forming substrate may comprise at least 150 milligrams of the aerosol-forming substrate. The aerosol-forming substrate may comprise at least 200 milligrams of the aerosol-forming substrate.

[0125] The rod of the aerosol-forming substrate may comprise 400 milligrams or less of the aerosol-forming substrate. The rod of the aerosol-forming substrate may comprise 350 milligrams or less of the aerosol-forming substrate. The rod of the aerosol-forming substrate may comprise 300 milligrams or less of the aerosol-forming substrate. The rod of the aerosol-forming substrate may comprise 250 milligrams or less of the aerosol-forming substrate.

[0126] A rod of the aerosol-forming substrate may contain between 80 milligrams and 400 milligrams of the aerosol-forming substrate. A rod of the aerosol-forming substrate may contain between 100 milligrams and 350 milligrams of the aerosol-forming substrate. A rod of the aerosol-forming substrate may contain between 150 milligrams and 250 milligrams of the aerosol-forming substrate.

[0127] The weight of the rod of aerosol-forming substrate may be at least 20 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be at least 25 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be at least 30 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be at least 35 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be at least 40 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be at least 45 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be at least 50 percent of the weight of the aerosol-generating article on a dry weight basis.

[0128] The weight of the rod of aerosol-forming substrate may be 80 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be 75 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be 70 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be 65 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be 60 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be 55 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of aerosol-forming substrate may be 50 percent or less of the weight of the aerosol-generating article on a dry weight basis.

[0129] The weight of the rod of the aerosol-forming substrate may be 25 percent to 80 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of the aerosol-forming substrate may be 30 percent to 75 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of the aerosol-generating substrate may be 35 percent to 70 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of the aerosol-generating substrate may be 45 percent to 65 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of the aerosol-generating substrate may be 50 percent to 60 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the rod of the aerosol-generating substrate may be 50 percent to 55 percent of the weight of the aerosol-generating article on a dry weight basis.

[0130] The rod of the aerosol-forming substrate may comprise cut tobacco material.The rod of the aerosol-forming substrate may comprise tobacco cut filler.

[0131] The tobacco cut filler may have a density of at least 150 milligrams per cubic centimeter. The tobacco cut filler may have a density of at least 175 milligrams per cubic centimeter. The tobacco cut filler may have a density of at least 200 milligrams per cubic centimeter. The tobacco cut filler may have a density of at least 250 milligrams per cubic centimeter.

[0132] The tobacco cut filler may have a density of 500 milligrams per cubic centimeter or less. The tobacco cut filler may have a density of 450 milligrams per cubic centimeter or less. The tobacco cut filler may have a density of 400 milligrams per cubic centimeter or less. The tobacco cut filler may have a density of 350 milligrams per cubic centimeter or less.

[0133] The tobacco cut filler may have a density of 150 milligrams per cubic centimeter to 500 milligrams per cubic centimeter. The tobacco cut filler may have a density of 175 milligrams per cubic centimeter to 450 milligrams per cubic centimeter. The tobacco cut filler may have a density of 200 milligrams per cubic centimeter to 400 milligrams per cubic centimeter. The tobacco cut filler may have a density of 250 milligrams per cubic centimeter to 350 milligrams per cubic centimeter.

[0134] The aerosol-forming substrate may comprise at least 80 milligrams of tobacco cut filler. The aerosol-forming substrate may comprise at least 100 milligrams of tobacco cut filler. The aerosol-forming substrate may comprise at least 150 milligrams of tobacco cut filler. The aerosol-forming substrate may comprise at least 200 milligrams of tobacco cut filler.

[0135] The rod of the aerosol-forming substrate may comprise 400 milligrams or less of tobacco cut filler. The rod of the aerosol-forming substrate may comprise 350 milligrams or less of tobacco cut filler. The rod of the aerosol-forming substrate may comprise 300 milligrams or less of tobacco cut filler. The rod of the aerosol-forming substrate may comprise 250 milligrams or less of tobacco cut filler.

[0136] The rod of the aerosol-forming substrate may comprise between 80 milligrams and 400 milligrams of tobacco cut filler. The rod of the aerosol-forming substrate may comprise between 100 milligrams and 350 milligrams of tobacco cut filler. The rod of the aerosol-forming substrate may comprise between 150 milligrams and 250 milligrams of tobacco cut filler.

[0137] The weight of the tobacco cut filler may be at least XX percent of the weight of the aerosol-generating article on a dry weight basis.

[0138] The weight of the tobacco cut filler may be at least 20 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be at least 25 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be at least 30 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be at least 35 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be at least 40 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be at least 45 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be at least 50 percent of the weight of the aerosol-generating article on a dry weight basis.

[0139] The weight of the tobacco cut filler may be 80 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 75 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 70 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 65 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 60 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 55 percent or less of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 50 percent or less of the weight of the aerosol-generating article on a dry weight basis.

[0140] The weight of the tobacco cut filler may be 25 percent to 80 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 30 percent to 75 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 35 percent to 70 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 45 percent to 65 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 50 percent to 60 percent of the weight of the aerosol-generating article on a dry weight basis. The weight of the tobacco cut filler may be 50 percent to 55 percent of the weight of the aerosol-generating article on a dry weight basis.

[0141] The rod of the aerosol-forming substrate may have a length of at least 15 millimeters.The rod of the aerosol-forming substrate may have a length of at least 16 millimeters.

[0142] The rod of the aerosol-forming substrate may have a length of 30 millimeters or less.The rod of the aerosol-forming substrate may have a length of 25 millimeters or less.The rod of the aerosol-forming substrate may have a length of 20 millimeters or less.

[0143] The rod of the aerosol-forming substrate may have a length of 15 mm to 30 mm. The rod of the aerosol-forming substrate may have a length of 16 mm to 25 mm. The rod of the aerosol-forming substrate may have a length of 16 mm to 20 mm. The rod of the aerosol-forming substrate may have a length of 17 mm to 19 mm.

[0144] In one embodiment, the rod of aerosol-forming substrate may have a length of 17 millimeters.

[0145] The present disclosure also relates to an aerosol generating system comprising an aerosol-generating article as described above and an aerosol generating device. The aerosol generating device comprises a heating chamber for receiving the aerosol-generating article. The aerosol generating device may comprise a heating member disposed at or about the periphery of the heating chamber. The aerosol generating device may comprise a heating element. The heating element may be provided at or about the periphery of the heating chamber. The heater may be preferably arranged to externally heat the rod of the aerosol-forming substrate.

[0146] The heating element may be any suitable type of heating element. The heating element may be an external heater.

[0147] The heating element may provide external heating to the aerosol-generating article when received within the aerosol-generating device. Such an external heater may surround the aerosol-generating article when inserted or received within the aerosol-generating device.

[0148] The heating element may be arranged to heat an outer surface of the aerosol-forming substrate. The heater may be arranged to be inserted into the aerosol-forming substrate when the aerosol-forming substrate is received in the heating chamber. The heating element may be located within the heating chamber.

[0149] The heating element may include at least one heating element. The at least one heating element may be any suitable type of heating element. The aerosol generating device may include only one heating element. The aerosol generating device may include multiple heating elements. The heating element may include at least one resistive heating element. The heating element may include multiple resistive heating elements. The resistive heating elements are preferably electrically connected in a parallel arrangement. Advantageously, providing multiple resistive heating elements electrically connected in a parallel arrangement may facilitate delivery of desired power to the heater while reducing or minimizing the voltage required to provide the desired power. Advantageously, reducing or minimizing the voltage required to operate the heating elements may facilitate reducing or minimizing the physical size of the power supply.

[0150] Suitable materials for forming the at least one resistive heating element include, but are not limited to, semiconductors such as doped ceramics, "conductive" ceramics (such as, for example, molybdenum disilicide), carbon, graphite, metals, metal alloys, and composites made of ceramic and metallic materials. Such composites may include doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum, and platinum group metals. Examples of suitable metal alloys include stainless steel, nickel-containing, cobalt-containing, chromium-containing, aluminum-containing, titanium-containing, zirconium-containing, hafnium-containing, niobium-containing, molybdenum-containing, tantalum-containing, tungsten-containing, tin-containing, gallium-containing, manganese-containing, and iron-containing alloys, as well as nickel-, iron-, cobalt-, and stainless steel-based superalloys, Timetal®, and iron-manganese-aluminum-based alloys.

[0151] The at least one resistive heating element may include one or more stamped pieces of electrically resistive material, such as stainless steel, or alternatively, the at least one resistive heating element may include a heating wire or filament (e.g., Ni-Cr (nickel-chromium), platinum, tungsten, or alloy wire).

[0152] In some embodiments, the at least one heating element comprises an electrically insulating substrate and the at least one resistive heating element is provided on the electrically insulating substrate.

[0153] The electrically insulating substrate may comprise any suitable material. For example, the electrically insulating substrate may comprise one or more of paper, glass, ceramic, anodized metal, coated metal, and polyimide. The ceramic may comprise mica, alumina (Al2O3), or zirconia (ZrO2). The electrically insulating substrate preferably has a thermal conductivity of about 40 watts per meter Kelvin or less, preferably about 20 watts per meter Kelvin or less, and ideally about 2 watts per meter Kelvin or less.

[0154] The heater may comprise a heating element comprising a rigid, electrically insulating substrate having one or more conductive tracks or wires arranged on its surface. Depending on the size and shape of the electrically insulating substrate, it may be possible to insert the heater directly into the aerosol-forming substrate. If the electrically insulating substrate is not sufficiently rigid, the heating element may comprise further reinforcing means. An electric current may be passed through the one or more conductive tracks to heat the heating element and the aerosol-forming substrate.

[0155] The heating element may comprise an induction heating arrangement. The induction heating arrangement may comprise an inductor coil and a power source configured to provide a high frequency oscillating current to the inductor coil. As used herein, high frequency oscillating current means an oscillating current having a frequency of about 500 kHz to about 30 MHz. The heater may advantageously comprise a DC / AC inverter for converting a DC current provided by a DC power source to an alternating current. The inductor coil may be arranged to generate a high frequency oscillating electromagnetic field upon receiving the high frequency oscillating current from the power source. The inductor coil may be arranged to generate a high frequency oscillating electromagnetic field within the heating chamber. In some embodiments, the inductor coil may substantially surround the heating chamber. The inductor coil may extend at least partially along a length of the heating chamber.

[0156] The heating element may include an induction heating element. The induction heating element may be a susceptor element. As used herein, the term "susceptor element" refers to an element that includes a material capable of converting electromagnetic energy into heat. When the susceptor element is located in an alternating electromagnetic field, the susceptor is heated. Heating of the susceptor element may be the result of at least one of hysteresis losses and eddy currents induced in the susceptor, depending on the electrical and magnetic properties of the susceptor material.

[0157] The susceptor element may be arranged such that when an aerosol-generating article is received in a heating chamber of the aerosol generating device, the oscillating electromagnetic field generated by the inductor coil induces a current in the susceptor element, heating the susceptor element. In these embodiments, the aerosol generating device is preferably capable of generating a fluctuating electromagnetic field having a magnetic field strength (H field strength) of 1 to 5 kiloamperes per meter (kA / m), preferably 2 to 3 kA / m, e.g., about 2.5 kA / m. The electrically operated aerosol generating device is preferably capable of generating a fluctuating electromagnetic field having a frequency of 1 to 30 MHz, e.g., 1 to 10 MHz, e.g., 5 to 7 MHz.

[0158] In these embodiments, the susceptor element is preferably located in contact with the aerosol-forming substrate. In some embodiments, the susceptor element is located within the aerosol-generating device. In these embodiments, the susceptor element may be located within a heating chamber. The aerosol-generating device may include only one susceptor element. The aerosol-generating device may include multiple susceptor elements. In some embodiments, the susceptor element is preferably arranged to heat an outer surface of the aerosol-forming substrate.

[0159] The susceptor elements may comprise any suitable material. The susceptor elements may be formed from any material that can be inductively heated to a temperature sufficient to release the volatile compound from the aerosol-forming substrate. Suitable materials for the elongated susceptor elements include graphite, molybdenum, silicon carbide, stainless steel, niobium, aluminum, nickel, nickel-containing compounds, titanium, and composites of metallic materials. Some susceptor elements comprise metal or carbon. Advantageously, the susceptor elements may comprise or consist of ferromagnetic materials, such as ferritic iron, ferromagnetic steel or stainless steel, ferromagnetic alloys, ferromagnetic particles, and ferrites. Suitable susceptor elements may be or include aluminum. The susceptor elements preferably comprise more than about 5 percent ferromagnetic or paramagnetic material, preferably more than 20 percent ferromagnetic or paramagnetic material, and more preferably more than 50 percent or more than 90 percent ferromagnetic or paramagnetic material. Some elongated susceptor elements can be heated to temperatures in excess of 250 degrees Celsius.

[0160] The heating element may have a length. The rod of the aerosol-forming substrate may have a length. The length of the heating element may be less than the length of the aerosol-forming substrate.

[0161] The length of the heating element may be 95 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 90 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 85 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 80 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 75 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 70 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 65 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 60 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 55 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 50 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 45 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 40 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 35 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 33 percent or less of the length of the rod of the aerosol-forming substrate. The length of the heating element may be 30 percent or less of the length of the rod of the aerosol-forming substrate.

[0162] The length of the heating element may be at least 25 percent of the length of the rod of the aerosol-forming substrate. The length of the heating element may be at least 30 percent of the length of the rod of the aerosol-forming substrate. The length of the heating element may be at least 35 percent of the length of the rod of the aerosol-forming substrate. The length of the heating element may be at least 40 percent of the length of the rod of the aerosol-forming substrate. The length of the heating element may be at least 45 percent of the length of the rod of the aerosol-forming substrate. The length of the heating element may be at least 50 percent of the length of the rod of the aerosol-forming substrate.

[0163] The length of the heating element may be between 25 percent of the length of the rod of the aerosol-forming substrate and 95 percent of the length of the rod of the aerosol-forming substrate. The length of the heating element may be between 50 percent of the length of the rod of the aerosol-forming substrate and 90 percent of the length of the rod of the aerosol-forming substrate. The length of the heating element may be between 60 percent of the length of the rod of the aerosol-forming substrate and 80 percent of the length of the rod of the aerosol-forming substrate.

[0164] Advantageously, optimizing the length of the rod of the aerosol-forming substrate relative to the length of the heating element can increase aerosol generation and provide an extended user experience.

[0165] The aerosol-generating article may include a housing. The housing may be a rigid housing.

[0166] The heating chamber may be referred to as the device cavity of the aerosol-generating device. The heating chamber may extend between a distal end and an oral (or proximal) end. The distal end of the heating chamber may be a closed end and the oral (or proximal) end of the heating chamber may be an open end. The aerosol-generating article may be inserted into the device cavity or heating chamber through the open end of the heating chamber. The heating chamber may be cylindrical in shape to fit the same shape of the aerosol-generating article.

[0167] The phrase "received within" may refer to the fact that a component or element is fully or partially received within another component or element. For example, the phrase "an aerosol-generating article is received within a heating chamber" refers to the aerosol-generating article being fully or partially received within the heating chamber of the aerosol-generating article. When the aerosol-generating article is received within the heating chamber, the aerosol-generating article may abut the distal end of the heating chamber. When the aerosol-generating article is received within the heating chamber, the aerosol-generating article may be substantially proximate to the distal end of the heating chamber. The distal end of the heating chamber may be defined by an end wall.

[0168] The heating chamber may be configured to establish a tight fit with an aerosol-generating article received within the heating chamber. A tight fit may refer to a sliding fit. The aerosol generating device may include a peripheral wall. Such peripheral wall may define the heating chamber. The peripheral wall defining the heating chamber may be configured to engage in a tight fit with the aerosol-generating article received within the heating chamber such that, when received within the aerosol generating device, there is substantially no gap or empty space between the peripheral wall defining the heating chamber and the aerosol-generating article.

[0169] Such an airtight fit may establish an airtight fit or configuration between the heating chamber and the aerosol-generating article received therein.

[0170] In such an airtight configuration, there will be substantially no gaps or empty spaces between the peripheral walls defining the heating chamber and the aerosol-generating article for air to flow therethrough.

[0171] A tight fit with the aerosol-generating article may be established along the entire length of the heating chamber or along a portion of the length of the heating chamber.

[0172] The aerosol generating device may include airflow channeling extending between the channel inlet and the channel outlet. The airflow channel may be configured to establish fluid communication between an interior of the heating chamber and an exterior of the aerosol generating device. The airflow channel of the aerosol generating device may be defined within a housing of the aerosol generating device to allow fluid communication between an interior of the heating chamber and an exterior of the aerosol generating device. When an aerosol-generating article is received within the heating chamber, the airflow channel may be configured to provide air flowing into the article to deliver the generated aerosol to a user who inhales from a mouth end of the article.

[0173] The airflow channel of the aerosol generating device may be defined within or by the peripheral wall of the housing of the aerosol generating device. In other words, the airflow channel of the aerosol generating device may be defined within the thickness of the peripheral wall, or by the inner surface of the peripheral wall, or a combination of both. The airflow channel may be partially defined by the inner surface of the peripheral wall, or partially defined within the thickness of the peripheral wall. The inner surface of the peripheral wall defines the periphery of the heating chamber.

[0174] The airflow channel of the aerosol generating device may extend from an inlet located at the oral or proximal end of the aerosol generating device to an outlet located away from the oral end of the device. The airflow channel may extend along a direction parallel to the longitudinal axis of the aerosol generating device.

[0175] The aerosol generating device may 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 (e.g., lithium cobalt, lithium iron phosphate, or lithium polymer battery). However, in some embodiments, the power source may be another form of charge storage device, such as a capacitor. The power source may be rechargeable and may have a capacity that allows for the storage of sufficient energy for one or more user operations, such as, for example, one or more aerosol generating experiences. For example, the power source may have a capacity sufficient to allow continuous heating of the aerosol-generating substrate for approximately six minutes, or a multiple of six minutes, corresponding to the typical time it takes to smoke one conventional cigarette. In another example, the power source may have a capacity sufficient to allow for a predetermined number of puffs, or discontinuous activation of the heating element.

[0176] The following provides a non-exhaustive list of non-limiting examples, any one or more of the features of which may be combined with any one or more features of another example, embodiment, or aspect described herein. [Brief description of the drawings]

[0177] [Figure 1] FIG. 1 shows a schematic side perspective view of an aerosol-generating article according to one embodiment of the present invention. [Diagram 2] FIG. 2 shows a schematic cross-sectional side view of an aerosol-generating article according to one embodiment of the present invention. [Diagram 3] FIG. 3 shows a schematic cross-sectional side view of an aerosol generating system comprising an aerosol generating article according to one embodiment of the invention and an aerosol generating device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0178] [Example 1] 1. An aerosol-generating article comprising: a rod of an aerosol-forming substrate; a hollow tubular element at the downstream end of the rod of the aerosol-forming substrate; a mouthpiece element at a downstream end of the hollow tubular element; the length of the rod of the aerosol-forming substrate is at least 30 percent of the length of the aerosol-generating article; 1. An aerosol-generating article, wherein the rod of aerosol-forming substrate has a tobacco content of between 30 percent by weight on a dry weight basis and 90 percent by weight on a dry weight basis.

[0179] [Example 2] An aerosol-generating article as described in example 1, wherein the length of the rod of the aerosol-forming substrate is at least 37 percent of the length of the aerosol-generating article.

[0180] [Example 3] 3. An aerosol-generating article as claimed in any one of Examples 1-2, wherein the rod of aerosol-forming substrate has a tobacco content of between 40 percent by weight on a dry weight basis and 85 percent by weight on a dry weight basis.

[0181] [Example 4] 4. An aerosol-generating article as claimed in any one of Examples 1 to 3, wherein the rod of aerosol-forming substrate has a tobacco content of between 50 percent by weight on a dry weight basis and 80 percent by weight on a dry weight basis.

[0182] [Example 5] An aerosol-generating article according to any one of Examples 1 to 4, wherein the rod of aerosol-forming substrate comprises one or more flavourants.

[0183] [Example 6] 6. The aerosol-generating article of example 5, wherein the rod of aerosol-forming substrate has a flavorant content of at least 0.1 weight percent on a dry weight basis.

[0184] [Example 7] 7. The aerosol-generating article of Example 6, wherein the rod of aerosol-forming substrate has a flavorant content of at least 5 percent by weight on a dry weight basis.

[0185] [Example 8] An aerosol-forming substrate as described in example 7, wherein the rod of the aerosol-forming substrate has a flavorant content of at least 10 percent by weight on a dry weight basis.

[0186] [Example 9] 9. The aerosol-generating article of example 8, wherein the rod of aerosol-forming substrate has a flavorant content of at least 15 percent by weight on a dry weight basis.

[0187] [Example 10] 10. The aerosol-generating article of example 9, wherein the rod of aerosol-forming substrate has a flavorant content of at least 20 percent by weight on a dry weight basis.

[0188] [Example 11] 6. The aerosol-generating article of example 5, wherein the rod of aerosol-forming substrate has a flavorant content of 25 weight percent or less on a dry weight basis.

[0189] [Example 12] 12. The aerosol-generating article of example 11, wherein the rod of aerosol-forming substrate has a flavorant content of 20 weight percent or less on a dry weight basis.

[0190] [Example 13] 13. The aerosol-generating article of example 12, wherein the rod of aerosol-forming substrate has a flavorant content of 15 weight percent or less on a dry weight basis.

[0191] [Example 14] 14. The aerosol-generating article of example 13, wherein the rod of aerosol-forming substrate has a flavorant content of 13 weight percent or less on a dry weight basis.

[0192] [Example 15] 15. An aerosol-generating article as described in Example 14, wherein the rod of aerosol-forming substrate has a flavorant content of 10 weight percent or less on a dry weight basis.

[0193] [Example 16] 6. The aerosol-generating article of example 5, wherein the rod of aerosol-forming substrate has a flavorant content of 0.1 to 25 weight percent on a dry weight basis.

[0194] [Example 17] 17. The aerosol-generating article of example 16, wherein the rod of aerosol-forming substrate has a flavorant content of 0.1 to 20 percent by weight on a dry weight basis.

[0195] [Example 18] 18. The aerosol-generating article of example 17, wherein the rod of aerosol-forming substrate has a flavorant content of 5 to 20 percent by weight on a dry weight basis.

[0196] [Example 19] 19. The aerosol-generating article of example 18, wherein the rod of aerosol-forming substrate has a flavorant content of 10 to 20 percent by weight on a dry weight basis.

[0197] [Example 20] 20. The aerosol-generating article of example 19, wherein the rod of aerosol-forming substrate has a flavorant content of 15 to 20 percent by weight on a dry weight basis.

[0198] [Example 21] 21. The aerosol-generating article of any one of Examples 5 to 20, wherein the one or more flavoring agents are one or more of clove, ginger, mint, rosemary, star anise, and tea.

[0199] [Example 22] 22. The aerosol-generating article of any one of Examples 1 to 21, wherein the rod of aerosol-forming substrate comprises one or more aerosol formers, and the rod of aerosol-forming substrate has an aerosol former content of at least 5 percent by weight on a dry weight basis.

[0200] [Example 23] 23. The aerosol-generating article of example 22, wherein the rod of aerosol-forming substrate has an aerosol former content of at least 10 percent by weight on a dry weight basis.

[0201] [Example 24] 24. The aerosol-generating article of example 23, wherein the rod of aerosol-forming substrate has an aerosol former content of at least 15 percent by weight on a dry weight basis.

[0202] [Example 25] The aerosol-generating article of any one of Examples 22 to 24, wherein the rod of aerosol-forming substrate has an aerosol former content of 30 weight percent or less on a dry weight basis.

[0203] [Example 26] 26. The aerosol-generating article of example 25, wherein the rod of aerosol-forming substrate has an aerosol former content of 25 weight percent or less on a dry weight basis.

[0204] [Example 27] 27. The aerosol-generating article of example 26, wherein the rod of aerosol-forming substrate has an aerosol former content of 20 weight percent or less on a dry weight basis.

[0205] [Example 28] An aerosol-generating article as described in any one of Examples 1 to 27, wherein the aerosol-generating article has a length of at least 38 millimeters.

[0206] [Example 29] 29. The aerosol-generating article of Example 28, wherein the aerosol-generating article has a length of at least 40 millimeters.

[0207] [Example 30] 30. The aerosol-generating article of example 29, wherein the aerosol-generating article has a length of at least 42 millimeters.

[0208] [Example 31] 31. An aerosol-generating article according to any one of Examples 1 to 30, wherein the aerosol-generating article has a length of 70 millimeters or less.

[0209] [Example 32] 32. The aerosol-generating article of embodiment 31, wherein the aerosol-generating article has a length of 60 millimeters or less.

[0210] [Example 33] 33. The aerosol-generating article of example 32, wherein the aerosol-generating article has a length of 50 millimeters or less.

[0211] [Example 34] 34. The aerosol-generating article of example 33, wherein the aerosol-generating article has a length of 45 millimeters or less.

[0212] [Example 35] An aerosol-generating article as described in any one of Examples 1 to 34, wherein the hollow tubular element has a length of at least 15 millimeters.

[0213] [Example 36] 36. The aerosol-generating article of example 35, wherein the hollow tubular element has a length of at least 17 millimeters.

[0214] [Example 37] 37. The aerosol-generating article of example 36, wherein the hollow tubular element has a length of at least 19 millimeters.

[0215] [Example 38] An aerosol-generating article as described in any one of Examples 1 to 37, wherein the hollow tubular element has a length of 30 millimeters or less.

[0216] [Example 39] 39. The aerosol-generating article of example 38, wherein the hollow tubular element has a length of 25 millimeters or less.

[0217] [Example 40] 40. The aerosol-generating article of example 39, wherein the hollow tubular element has a length of 23 millimeters or less.

[0218] [Example 41] An aerosol-generating article according to any one of Examples 1 to 40, wherein the mouthpiece element has a length of at least 3 millimeters.

[0219] [Example 42] An aerosol-generating article as described in Example 41, wherein the mouthpiece element has a length of at least 5 millimeters.

[0220] [Example 43] An aerosol-generating article according to any one of Examples 1 to 42, wherein the mouthpiece element has a length of 11 millimeters or less.

[0221] [Example 44] An aerosol-generating article as described in Example 43, wherein the mouthpiece element has a length of 9 millimeters or less.

[0222] [Example 45] An aerosol-generating article as described in Example 44, wherein the mouthpiece element has a length of 7 millimeters or less.

[0223] [Example 46] An aerosol-generating article as described in any one of Examples 1 to 45, comprising a ventilation zone at a position along the hollow tubular element.

[0224] [Example 47] An aerosol-generating article as described in any one of Examples 1 to 46, wherein the hollow tubular element provides a withdrawal resistance of 1 mm H2O or less.

[0225] [Example 48] An aerosol-generating article as described in any one of Examples 1 to 47, wherein the mouthpiece element provides a withdrawal resistance of at least about 3 mm H2O.

[0226] [Example 49] An aerosol-generating article as described in Example 48, wherein the mouthpiece element provides a withdrawal resistance of at least about 6 mm H2O.

[0227] [Example 50] An aerosol-generating article as described in any one of Examples 1 to 49, wherein the mouthpiece element provides a withdrawal resistance of 12 mm H2O or less.

[0228] [Example 51] 51. The aerosol-generating article of Example 50, wherein the mouthpiece element provides a withdrawal resistance of 10 mm H2O or less.

[0229] [Example 52] An aerosol-generating article according to any one of Examples 1 to 51, wherein the rod of the aerosol-forming substrate is the most upstream part of the aerosol-generating article.

[0230] [Example 53] 53. An aerosol-generating article according to any one of Examples 1 to 52, wherein the aerosol-forming substrate has a density of at least 150 milligrams per cubic centimeter.

[0231] [Example 54] 54. The aerosol-generating article of any one of Examples 1 to 53, wherein the aerosol-forming substrate has a density of 500 milligrams per cubic centimeter or less.

[0232] [Example 55] 55. The aerosol-generating article of any one of Examples 1 to 54, wherein the aerosol-forming substrate has a density of 150 milligrams per cubic centimeter to 500 milligrams per cubic centimeter.

[0233] [Example 56] An aerosol-generating article according to any one of Examples 1 to 55, wherein the rod of aerosol-forming substrate comprises at least 80 milligrams of aerosol-forming substrate.

[0234] [Example 57] 57. An aerosol-generating article according to any one of Examples 1 to 56, wherein the rod of aerosol-forming substrate comprises no more than 400 milligrams of aerosol-forming substrate.

[0235] [Example 58] 58. An aerosol-generating article according to any one of Examples 1 to 57, wherein the rod of aerosol-forming substrate comprises between 150 milligrams and 250 milligrams of aerosol-forming substrate.

[0236] [Example 59] An aerosol-generating article according to any one of Examples 1 to 58, wherein the weight of the rod of aerosol-forming substrate is at least 45 weight percent of the weight of the aerosol-generating article on a dry weight basis.

[0237] [Example 60] 60. The aerosol-generating article of any one of Examples 1 to 59, wherein the rod of aerosol-forming substrate comprises tobacco cut filler.

[0238] [Example 61] An aerosol-generating article as described in Example 60, wherein the tobacco cut filler has a density of at least 150 milligrams per cubic centimeter.

[0239] [Example 62] An aerosol-generating article as described in Example 60, wherein the tobacco cut filler has a density of 500 milligrams per cubic centimeter or less.

[0240] [Example 63] 61. The aerosol-generating article of example 60, wherein the tobacco cut filler has a density of 150 milligrams per cubic centimeter to 500 milligrams per cubic centimeter.

[0241] [Example 64] 61. The aerosol-generating article of example 60, wherein the rod of aerosol-forming substrate comprises at least 80 milligrams of tobacco cut filler.

[0242] [Example 65] 61. The aerosol-generating article of example 60, wherein the rod of aerosol-forming substrate comprises 400 milligrams or less of tobacco cut filler.

[0243] [Example 66] 61. The aerosol-generating article of example 60, wherein the rod of aerosol-forming substrate comprises 150 milligrams to 250 milligrams of tobacco cut filler.

[0244] [Example 67] An aerosol-generating article as described in Example 60, wherein the weight of the tobacco cut filler is at least 35 percent of the weight of the aerosol-generating article on a dry weight basis.

[0245] [Example 68] An aerosol-generating article according to any one of Examples 1 to 67, wherein the rod of aerosol-forming substrate has a length of at least 15 millimeters.

[0246] [Example 69] 69. The aerosol-generating article of example 68, wherein the rod of aerosol-forming substrate has a length of 17 millimeters.

[0247] [Example 70] 70. An aerosol-generating article according to any one of Examples 1 to 69, wherein the rod of the aerosol-forming substrate has a length of 30 millimeters or less.

[0248] [Example 71] 71. The aerosol-generating article of example 70, wherein the rod of the aerosol-forming substrate has a length of 20 millimeters or less.

[0249] [Example 72] 72. An aerosol-generating article according to any one of Examples 1 to 71, wherein the aerosol-generating article has an outer diameter of at least 5 millimeters.

[0250] [Example 73] 73. The aerosol-generating article of example 72, wherein the aerosol-generating article has an outer diameter of at least 7 millimeters.

[0251] [Example 74] 74. The aerosol-generating article of any one of Examples 1 to 73, wherein the aerosol-generating article has an outer diameter of 10 millimeters or less.

[0252] [Example 75] 75. The aerosol-generating article of example 74, wherein the aerosol-generating article has an outer diameter of 8 millimeters or less.

[0253] The invention will now be further described with reference to the drawings of the accompanying drawings, in which:

[0254] 1 comprises a rod of aerosol-forming substrate 12 and a downstream section 14 located downstream of the rod of aerosol-forming substrate 12. The aerosol-generating article 10 thus extends from an upstream or distal end 16, which substantially coincides with the upstream end of the rod of aerosol-forming substrate 12, to a downstream or oral end 18, which coincides with the downstream end of the downstream section 14. The downstream section 14 comprises a hollow tubular element 20 and a mouthpiece element 50.

[0255] In this embodiment, the aerosol-generating article 10 has an overall length of about 45 millimeters and an outer diameter of about 7.2 mm.

[0256] The aerosol-forming substrate rod 12 includes a cut tobacco material. In this embodiment, the aerosol-forming substrate rod 12 also includes cloves. The aerosol-forming substrate rod 12 includes 150 milligrams of cut tobacco material with 13 weight percent to 16 weight percent glycerin. The density of the aerosol-forming substrate is about 300 mg per cubic centimeter. The aerosol-forming substrate rod 12 has an RTD of about 6 to 8 mm H2O. The aerosol-forming substrate rod 12 also includes 52 milligrams of cloves. The aerosol-forming substrate rods 12 are individually wrapped with plug wrap (not shown).

[0257] The hollow tubular element 20 is located immediately downstream of the rod of aerosol-forming substrate 12. The hollow tubular element 20 is longitudinally aligned with the rod of aerosol-forming substrate 12. The upstream end of the hollow tubular element 20 abuts the downstream end of the rod of aerosol-forming substrate 12.

[0258] The hollow tubular element 20 defines a hollow section of the aerosol-generating article 10. The hollow tubular element does not contribute substantially to the overall RTD of the aerosol-generating article. More specifically, the RTD of the hollow tubular element 20 is about 0 mmH2O.

[0259] 2, the hollow tubular element 20 is provided in the form of a hollow cylindrical tube made of cardboard. The hollow tubular element 20 defines an interior cavity 22 that extends from the upstream end of the hollow tubular element 20 all the way to the downstream end of the hollow tubular element 20. The interior cavity 22 is substantially empty, such that substantially unrestricted airflow is possible therealong. The hollow tubular element 20 does not substantially contribute to the overall RTD of the aerosol-generating article 10.

[0260] In this embodiment, the hollow tubular element 20 has a length of about 21 millimeters, an outer diameter of about 7.2 millimeters, and an inner diameter of about 6.7 millimeters. The peripheral wall thickness of the hollow tubular element 20 is therefore about 0.25 millimeters.

[0261] The aerosol-generating article 10 comprises a ventilation zone 30 provided at a location along the hollow tubular element 20. In this embodiment, the ventilation zone 30 is provided at a location that is about 16 millimeters from the downstream end 18 of the article 10. The ventilation zone 30 is provided at a location about 12 mm downstream from the downstream end of the rod of aerosol-forming substrate 12. In this embodiment, the ventilation zone 30 is provided at a location about 9 millimeters upstream from the upstream end of the mouthpiece element 50. The ventilation zone 30 comprises a circumferential row of openings or perforations surrounding the hollow tubular element 20. The perforations of the ventilation zone 30 extend through the wall of the hollow tubular element 20 to allow ingress of fluid from the exterior of the article 10 into the interior cavity 22. The ventilation level of the aerosol-generating article 10 is about 16 percent.

[0262] In this embodiment, the most upstream portion of the aerosol-generating article 10 is the upstream end of the rod of aerosol-forming substrate 12. Thus, the aerosol-generating article 10 extends from a distal end 16, which is substantially coincident with the upstream end of the rod of aerosol-forming substrate 12, to a mouth or downstream end 18, which is substantially coincident with the downstream end of the downstream section 14.

[0263] In another embodiment, the aerosol-generating article 10 comprises an upstream element located immediately upstream of the rod of aerosol-forming substrate 12. In this embodiment, the downstream end of the upstream element may abut the upstream end of the rod of aerosol-forming substrate 12. The upstream element may be provided in the form of a hollow cylindrical plug of cellulose acetate tow having a wall thickness of about 1 millimeter and defining an interior cavity 23.

[0264] The mouthpiece element 50 extends from the downstream end of the hollow tubular element 20 to the downstream or mouth end of the aerosol-generating article 10. The mouthpiece element 50 has a length of about 7 mm. The outer diameter of the mouthpiece element 50 is about 7.2 mm. The mouthpiece element 50 comprises a low density cellulose acetate filter segment. The RTD of the mouthpiece element 50 is about 8 mmH2O. The mouthpiece element 50 may be individually wrapped with a plug wrap (not shown).

[0265] 1 and 2, the aerosol-generating article 10 comprises an upstream wrapper 44 that surrounds the aerosol-forming substrate 12 and the hollow tubular element 20. The ventilation zone 30 may also comprise a circumferential row of perforations provided on the upstream wrapper 44. The perforations in the upstream wrapper 44 overlap with the perforations provided on the hollow tubular element 20. As a result, the upstream wrapper 44 overlies the perforations of the ventilation zone 30 provided on the hollow tubular element 20.

[0266] The aerosol-generating article 10 also includes a tipping wrapper 52 that surrounds the hollow tubular element 20 and the mouthpiece element 50. The tipping wrapper 52 overlies the portion of the upstream wrapper 44 that overlies the hollow tubular element 20. In this manner, the tipping wrapper 52 effectively bonds the mouthpiece element 50 to the remaining components of the aerosol-generating article 10. In this embodiment, the width of the tipping wrapper 52 is about 26 millimeters. Additionally, the ventilation zone 30 may include a circumferential row of perforations provided on the tipping wrapper 52. The perforations of the tipping wrapper 52 overlap the perforations provided on the hollow tubular element 20 and on the upstream wrapper 44. As a result, the tipping wrapper 52 overlies the perforations of the ventilation zone 30 that are provided on the hollow tubular element 20 and on the upstream wrapper 44.

[0267] FIG. 3 illustrates an aerosol generating system 100 comprising an exemplary aerosol generating device 1 and an aerosol-generating article 10 equivalent to that shown in FIGS. 1 and 2. FIG. 3 illustrates a downstream oral end portion of the aerosol generating device 1 in which a device cavity is defined and capable of receiving the aerosol-generating article 10. The aerosol generating device 1 comprises a housing (or body) 4 extending between an oral end 2 and a distal end (not shown). The housing 4 comprises a peripheral wall 6. The peripheral wall 6 defines a device cavity for receiving the aerosol-generating article 10. The device cavity is defined by a closed distal end and an open oral end. The oral end of the device cavity is located at the oral end of the aerosol generating device 1. The aerosol-generating article 10 is configured to be received through the oral end of the device cavity and configured to abut the closed end of the device cavity.

[0268] An airflow channel 5 of the device is defined in a peripheral wall 6. The airflow channel 5 extends between an inlet 7 located at the mouth end of the aerosol generation device 1 and a closed end of the device cavity. Air may enter the aerosol-forming substrate 12 via an opening (not shown) provided in the closed end of the device cavity, ensuring fluid communication between the airflow channel 5 and the aerosol-forming substrate 12.

[0269] The aerosol generating device 1 further comprises a heater (not shown) and a power supply (not shown) for supplying power to the heater. A controller (not shown) is also provided for controlling the supply of such power to the heater. The heater is configured to controllably heat the aerosol-generating article 10 during use when the aerosol-generating article 1 is received within the device 1. The heater is preferably arranged to externally heat the aerosol-forming substrate 12 for optimal aerosol generation. The ventilation zone 30 is arranged to be exposed to the aerosol-generating article 10 when it is received within the aerosol generating device 1.

[0270] In the embodiment shown in Fig. 3, the device cavity defined by the peripheral wall 6 has a length of 28 mm. When the article 10 is received in the device cavity, the rod 12 of the aerosol-forming substrate and the upstream part of the hollow tubular element 20 are received in the device cavity. Such upstream part of the hollow tubular element 20 has a length of 11 mm. Thus, about 28 mm of the aerosol-generating article 10 is received in the aerosol-generating device 1 and about 17 mm of the aerosol-generating article 10 is located outside the aerosol-generating device 1. In other words, about 17 mm of the article 10 protrudes from the aerosol-generating device 1 when the aerosol-generating article 10 is received in the aerosol-generating device 1. Such a length PL of the aerosol-generating article 10 protruding from the aerosol-generating device 1 is shown in Fig. 3.

[0271] As a result, the ventilation zone 30 is advantageously located outside the aerosol generation device 1 when the aerosol-generating article 10 is inserted into the aerosol generation device 1. If the device cavity is 28 mm long, the ventilation zone 30 is located 1 mm downstream from the mouth end 2 of the aerosol generation device 1 when the aerosol-generating article 10 is received within the aerosol generation device 1.

[0272] For purposes of this specification and the appended claims, unless otherwise indicated, all numbers expressing amounts, quantities, percentages, and the like are understood to be modified in all instances by the term "about." Also, all ranges include the maximum and minimum points disclosed, and include any intermediate ranges therein, which may or may not be specifically recited herein. Thus, in this context, the number A is understood as A±10%. Within this context, the number A may be considered to include a numerical value that is within the general standard error for the measurement of the property that the number A modifies. The number A may deviate by the percentages recited above, in some instances used in the appended claims, provided that the amount by which A deviates does not materially affect the basic and novel properties of the claimed invention. Also, all ranges include the maximum and minimum points disclosed, and include any intermediate ranges therein, which may or may not be specifically recited herein.

Claims

1. Aerosol-generating article, A rod of aerosol-forming substrate, A hollow tubular element at the downstream end of the rod of the aerosol-forming substrate, The hollow tubular element comprises a mouthpiece element at the downstream end of the aforementioned hollow tubular element, The length of the rod of the aerosol-forming substrate is at least 30 percent of the length of the aerosol-generating article. The rod of the aerosol-forming substrate has a tobacco content of 30% by weight to 90% by weight on a dry weight basis. The aerosol-forming substrate has a density of 150 milligrams / cubic centimeter to 500 milligrams / cubic centimeter. The length of the hollow tubular element is at least 15 centimeters. An aerosol generating article in which the rod of the aerosol-forming substrate contains a tobacco cut filler.

2. The aerosol generating article according to claim 1, wherein the length of the rod of the aerosol forming substrate is at least 37 percent of the length of the aerosol generating article.

3. The aerosol generating article according to claim 1 or claim 2, wherein the rod of the aerosol-forming substrate has a tobacco content of 40% by weight to 85% by weight on a dry weight basis.

4. The aerosol generating article according to claim 1 or claim 2, wherein the rod of the aerosol-forming substrate contains one or more flavoring agents.

5. The aerosol generating article according to claim 4, wherein the rod of the aerosol forming substrate has a flavoring agent content of at least 0.1 weight percent on a dry weight basis.

6. The aerosol generating article according to claim 5, wherein the rod of the aerosol-forming substrate has a flavoring agent content of at least 5% by weight on a dry weight basis.

7. The aerosol generating article according to claim 4, wherein the rod of the aerosol forming substrate has a flavoring agent content of 25% by weight or less on a dry weight basis.

8. The aerosol generating article according to claim 4, wherein the one or more flavoring agents are one or more of clove, ginger, mint, rosemary, star anise, and tea.

9. The aerosol generating article according to claim 1 or claim 2, wherein the rod of the aerosol-forming substrate contains one or more aerosol-forming bodies, and the rod of the aerosol-forming substrate has an aerosol-forming body content of at least 5% by weight on a dry weight basis.

10. The aerosol generating article according to claim 1 or claim 2, wherein the rod of the aerosol forming substrate has a length of 30 millimeters or less.

11. The aerosol generating article according to claim 1 or claim 2, wherein the aerosol generating article has an outer diameter of at least 5 millimeters.

12. The aerosol generating article according to claim 1 or claim 2, wherein the rod of the aerosol-forming substrate has a density of less than 350 milligrams / cubic centimeter.

13. Aerosol generation system, an aerosol generating article according to claim 1 or claim 2, Aerosol generator, A heating chamber for receiving the aerosol generator, An aerosol generator comprising a heating element, An aerosol generating system in which the heating element has a length shorter than the length of the rod of the aerosol forming substrate.

14. The aerosol generating system according to claim 13, wherein the length of the heating element is 90 percent or less of the length of the rod of the aerosol forming substrate.

15. The aerosol generating system according to claim 13, wherein the length of the heating element is 60 percent to 80 percent of the length of the rod of the aerosol forming substrate.

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