WO2023198754A1

WO2023198754A1 - Aerosol-generating article with long rod of aerosol-forming substrate

Info

Publication number: WO2023198754A1
Application number: PCT/EP2023/059523
Authority: WO
Inventors: Gennaro CAMPITELLI; Bruno Christian Joseph CHASSOT
Original assignee: Philip Morris Products S.A.
Priority date: 2022-04-12
Filing date: 2023-04-12
Publication date: 2023-10-19

Abstract

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

Description

AEROSOL-GENERATING ARTICLE WITH LONG ROD OF AEROSOL-FORMING SUBSTRATE

The present invention relates to an aerosol-generating article. The aerosol-generating article comprises an aerosol-forming substrate, which produces an inhalable aerosol upon heating.

Aerosol-generating articles in which an aerosol-forming substrate, such as a tobaccocontaining substrate, is heated rather than combusted, are known in the art. Typically, in such heated smoking articles an aerosol is generated by the transfer of heat from a heat source to a physically separate aerosol-forming substrate or material, which may be located in contact with, within, around, or downstream of the heat source. During 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 air drawn through the aerosol-generating article. As the released compounds cool, they condense to form an aerosol.

A number of prior art documents disclose aerosol-generating devices for consuming aerosol-generating articles. Such devices include, for example, electrically heated aerosolgenerating devices in which an aerosol is generated by the transfer of heat from one or more electrical heater elements of the aerosol-generating device to the aerosol-forming substrate of a heated aerosol-generating article. For example, electrically heated aerosol-generating devices have been proposed that comprise an internal heater blade which is adapted to be inserted into the aerosol-forming substrate. Use of an aerosol-generating article in combination with an external heating system is also known. For example, WO 2020/115151 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. As an alternative, inductively heatable aerosol-generating articles comprising an aerosol-forming substrate and a susceptor arranged within the aerosol-forming substrate have been proposed by WO 2015/176898.

Aerosol-generating articles in which a tobacco-containing substrate is heated rather than combusted present a number of challenges that were not encountered with conventional smoking articles.

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

It would be desirable to provide a new and improved aerosol-generating article. There is provided an aerosol-generating article. 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 dry weight basis and 90 percent by weight on a dry weight basis.

There is also provided an aerosol-generating article comprising: a rod of aerosolforming substrate; a hollow tubular element at a downstream end of the rod of aerosol-forming substrate; and a mouthpiece element at a 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 wherein the rod of aerosol-forming substrate has a tobacco content of between 30 percent by weight on dry weight basis and 90 percent by weight on a dry weight basis.

There is also provided an aerosol-generating system. The aerosol-generating system may comprise an aerosol-generating article. 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 aerosolgenerating 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 dry weight basis and 90 percent by weight on a dry weight basis. The aerosol-generating system may comprise an aerosolgenerating device. The aerosol-generating device may comprise 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 that is less than the length of the rod of aerosol-forming substrate.

There is also provided an aerosol-generating system comprising: an aerosolgenerating article and the 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 a 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 wherein the rod of aerosolforming substrate has a tobacco content of between 30 percent by weight on dry weight basis and 90 percent by weight on a dry weight basis, the aerosol-generating device comprising a heating chamber for receiving the aerosol-generating article, and a heating element, wherein the heating element has a length that is less than the length of the rod of aerosol-forming substrate.

In some aerosol-generating articles it may be desirable to include components other than tobacco and aerosol former in the rod of aerosol-forming substrate. For example, it may be desirable to include one or more flavourants in the rod of aerosol-forming substrate.

The term “flavourant” refers to organoleptic compounds, compositions, or materials that alter and are intended to alter the taste or aroma characteristics of one or more components of the aerosol-forming substrate during consumption or inhalation thereof. The flavourant may, for example, alter and or be intended to alter the taste or aroma characteristics of nicotine during consumption or inhalation thereof. For the purpose of this disclosure, nicotine is not considered as a “flavourant” or flavour.

However, replacing a portion of the tobacco in a rod of aerosol-forming substrate with a flavourant reduces the amount of tobacco in the rod, and therefore reduces the amount of nicotine that can be delivered to a user. This may reduce the overall length of the experience provided to the user.

Advantageously, increasing the length of the rod of aerosol-forming substrate relative to the overall length of the aerosol-generating article provides for an aerosol-generating article having more aerosol-forming substrate when compared to conventional aerosol-generating articles of the same size and shape. An increased amount of aerosol-forming substrate may have more tobacco, which consequently may allow for more nicotine to be delivered to a user, while maintaining the same size and the shape of the aerosol-generating article. This configuration may allow for an aerosol-generating article to have an aerosol-forming substrate containing other components such as flavourants, while also being capable of delivering what the user perceives as a normal amount of nicotine to a user.

Furthermore, having a larger aerosol-forming substrate may provide for a longer user experience.

In addition, by keeping the overall length and diameter of the aerosol-generating article the same, the aerosol-generating article can still be used with conventional aerosol-generating devices.

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

The length of the rod of aerosol-forming substrate may be less than or equal to 45 percent of the length of the aerosol-generating article. The length of the rod of aerosol-forming substrate may be less than or equal to 43 percent of the length of the aerosol-generating article. The length of the rod of aerosol-forming substrate may be less than or equal to 41 percent of the length of the aerosol-generating article. The length of the rod of aerosol-forming substrate may be less than or equal to 39 percent of the length of the aerosol-generating article.

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

The rod of aerosol-forming substrate may have a length of at least 10 millimetres The rod of aerosol-forming substrate may have a length of at least 12 millimetres. The rod of aerosol-forming substrate may have a length of at least 14 millimetres. The rod of aerosolforming substrate may have a length of at least 16 millimetres.

The rod of aerosol-forming substrate may have a length of less than or equal to 22 millimetres. The rod of aerosol-forming substrate may have a length of less than or equal to 20 millimetres. The rod of aerosol-forming substrate may have a length of less than or equal to 18 millimetres. The rod of aerosol-forming substrate may have a length of less than or equal to 16 millimetres.

The rod of aerosol-forming substrate may have a length of between 14 millimetres and 20 millimetres. The rod of aerosol-forming substrate may have a length of between 16 millimetres and 18 millimetres.

In one example, the rod of aerosol-forming substrate has a length of 17 millimetres.

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

The rod of aerosol-forming substrate may have a tobacco content of less than or equal to 90 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a tobacco content of less than or equal to 85 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a tobacco content of less than or equal to 80 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a tobacco content of less than or equal to 75 percent by weight on a dry weight basis. The rod of aerosolforming substrate may have a tobacco content of less than or equal to 70 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a tobacco content of less than or equal to 65 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a tobacco content of less than or equal to 60 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a tobacco content of less than or equal to 55 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a tobacco content of less than or equal to 50 percent by weight on a dry weight basis.

The rod of aerosol-forming substrate may have a tobacco content of between 35 percent by weight on dry weight basis and 90 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a tobacco content of between 40 percent by weight on dry weight basis and 85 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a tobacco content of between 45 percent by weight on dry weight basis and 80 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a tobacco content of between 50 percent by weight on dry weight basis and 80 percent by weight on a dry weight basis.

The rod of aerosol-forming substrate may comprise one of more flavourants. The rod of aerosol-forming substrate may comprise a plurality of flavourants.

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

The rod of aerosol-forming substrate may have a flavourant content of less than or equal to 25 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a flavourant content of less than or equal to 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a flavourant content of less than or equal to 18 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a flavourant content of less than or equal to 15 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a flavourant content of less than or equal to 13 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a flavourant content of less than or equal to 10 percent by weight on a dry weight basis. The rod of aerosolforming substrate may have a flavourant content of less than or equal to 8 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a flavourant content of less than or equal to 5 percent by weight on a dry weight basis.

The rod of aerosol-forming substrate may have a flavourant content of between 0.1 and 25 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a flavourant content of between 0.1 and 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a flavourant content of between 5 and 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a flavourant content of between 10 and 20 percent by weight on a dry weight basis. The rod of aerosolforming substrate may have a flavourant content of between 15 and 20 percent by weight on a dry weight basis.

The one or more flavourants may be one or more of: clove, ginger, mint, rosemary, star anise, and tea. The plurality of flavourants may be a combination of two or more of: clove, ginger, mint, rosemary, star anise, and tea.

In one example, the rod of aerosol-forming substrate may comprise clove.

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

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

The rod of aerosol-forming substrate may have a clove content of between 0.1 and 25 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a clove content of between 0.1 and 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a clove content of between 5 and 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a clove content of between 10 and 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a clove content of between 15 and 20 percent by weight on a dry weight basis.

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

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

The rod of aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of between 0.1 and 25 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of between 0.1 and 20 percent by weight on a dry weight basis. The rod of aerosolforming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of between 5 and 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of between 10 and 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a clove, ginger, mint, rosemary, star anise, and tea content of between 15 and 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may comprise at least 30 milligrams of flavourant. The rod of aerosol-forming substrate may comprise at least 35 milligrams of flavourant. The rod of aerosol-forming substrate may comprise at least 40 milligrams of flavourant. The rod of aerosol-forming substrate may comprise at least 45 milligrams of flavourant. The rod of aerosol-forming substrate may comprise at least 50 milligrams of flavourant.

The rod of aerosol-forming substrate may comprise less than or equal to 75 milligrams of flavourant The rod of aerosol-forming substrate may comprise less than or equal to 70 milligrams of flavourant. The rod of aerosol-forming substrate may comprise less than or equal to 65 milligrams of flavourant. The rod of aerosol-forming substrate may comprise less than or equal to 60 milligrams of flavourant. The rod of aerosol-forming substrate may comprise less than or equal to 55 milligrams of flavourant.

The rod of aerosol-forming substrate may comprise between 30 milligrams and 75 milligrams of flavourant. The rod of aerosol-forming substrate may comprise between 35 milligrams and 70 milligrams of flavourant. The rod of aerosol-forming substrate may comprise between 40 milligrams and 65 milligrams of flavourant. The rod of aerosol-forming substrate may comprise between 45 milligrams and 60 milligrams of flavourant. The rod of aerosolforming substrate may comprise between 50 milligrams and 55 milligrams of flavourant.

The rod of aerosol-forming substrate may comprise at least 30 milligrams of clove. The rod of aerosol-forming substrate may comprise at least 35 milligrams of clove. The rod of aerosol-forming substrate may comprise at least 40 milligrams of clove. The rod of aerosolforming substrate may comprise at least 45 milligrams of clove. The rod of aerosol-forming substrate may comprise at least 50 milligrams of clove.

The rod of aerosol-forming substrate may comprise less than or equal to 75 milligrams of clove The rod of aerosol-forming substrate may comprise less than or equal to 70 milligrams of clove. The rod of aerosol-forming substrate may comprise less than or equal to 65 milligrams of clove. The rod of aerosol-forming substrate may comprise less than or equal to 60 milligrams of clove. The rod of aerosol-forming substrate may comprise less than or equal to 55 milligrams of clove.

The rod of aerosol-forming substrate may comprise between 30 milligrams and 75 milligrams of clove. The rod of aerosol-forming substrate may comprise between 35 milligrams and 70 milligrams of clove. The rod of aerosol-forming substrate may comprise between 40 milligrams and 65 milligrams of clove. The rod of aerosol-forming substrate may comprise between 45 milligrams and 60 milligrams of clove. The rod of aerosol-forming substrate may comprise between 50 milligrams and 55 milligrams of clove.

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

The rod of aerosol-forming substrate may comprise less than or equal to 75 milligrams of clove, ginger, mint, rosemary, star anise, and tea The rod of aerosol-forming substrate may comprise less than or equal to 70 milligrams of clove, ginger, mint, rosemary, star anise, and tea. The rod of aerosol-forming substrate may comprise less than or equal to 65 milligrams of clove, ginger, mint, rosemary, star anise, and tea. The rod of aerosol-forming substrate may comprise less than or equal to 60 milligrams of clove, ginger, mint, rosemary, star anise, and tea. The rod of aerosol-forming substrate may comprise less than or equal to 55 milligrams of clove, ginger, mint, rosemary, star anise, and tea.

The rod of aerosol-forming substrate may comprise between 30 milligrams and 75 milligrams of clove, ginger, mint, rosemary, star anise, and tea. The rod of aerosol-forming substrate may comprise between 35 milligrams and 70 milligrams of clove, ginger, mint, rosemary, star anise, and tea. The rod of aerosol-forming substrate may comprise between 40 milligrams and 65 milligrams of clove, ginger, mint, rosemary, star anise, and tea. The rod of aerosol-forming substrate may comprise between 45 milligrams and 60 milligrams of clove, ginger, mint, rosemary, star anise, and tea. The rod of aerosol-forming substrate may comprise between 50 milligrams and 55 milligrams of clove, ginger, mint, rosemary, star anise, and tea.

The rod of aerosol-forming substrate may comprise one of more aerosol formers. The rod of aerosol-forming substrate may comprise a plurality of aerosol formers.

The aerosol former may be any suitable known compound or mixture of compounds that, in use, facilitates formation of a dense and stable aerosol. The aerosol former may be facilitating that the aerosol is substantially resistant to thermal degradation at temperatures typically applied during use of the aerosol-generating article. Suitable aerosol formers are for example: polyhydric alcohols such as, for example, triethylene glycol, 1 ,3-butanediol, propylene glycol and glycerine; esters of polyhydric alcohols such as, for example, glycerol mono-, di- or triacetate; aliphatic esters of mono-, di- or polycarboxylic acids such as, for example, dimethyl dodecanedioate and dimethyl tetradecanedioate; and combinations thereof.

The aerosol former may comprise glycerine. The aerosol former may comprise propylene glycol. The aerosol former may consist of glycerine. The aerosol former may consist of propylene glycol. The aerosol former may comprise a combination of glycerine and propylene glycol. The aerosol former may consist of a combination of glycerine and propylene glycol.

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

The rod of aerosol-forming substrate may have an aerosol former content of less than or equal to 30 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have an aerosol former content of less than or equal to 25 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have an aerosol former content of less than or equal to 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have an aerosol former content of less than or equal to 15 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have an aerosol former content of less than or equal to 10 percent by weight on a dry weight basis.

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

The rod of aerosol-forming substrate may have a glycerine content of less than or equal to 30 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a glycerine content of less than or equal to 25 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a glycerine content of less than or equal to 20 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a glycerine content of less than or equal to 15 percent by weight on a dry weight basis. The rod of aerosol-forming substrate may have a glycerine content of less than or equal to 10 percent by weight on a dry weight basis. The aerosol-generating article may have a length of at least 38 millimetres. The aerosol-generating article may have a length of at least 40 millimetres. The aerosol-generating article may have a length of at least 42 millimetres.

The aerosol-generating article may have a length of less than or equal to 70 millimetres. The aerosol-generating article may have a length of less than or equal to 60 millimetres. The aerosol-generating article may have a length of less than or equal to 50 millimetres. The aerosol-generating article may have a length of less than or equal to 45 millimetres. The aerosol-generating article may have a length of 45 millimetres.

The aerosol-generating article may have a length of between 38 millimetres and 70 millimetres. The aerosol-generating article may have a length of between 38 millimetres and 60 millimetres. The aerosol-generating article may have a length of between 40 millimetres and 50 millimetres. The aerosol-generating article may have a length of between 42 millimetres and 48 millimetres. The aerosol-generating article may have a length of between 44 millimetres and 46 millimetres.

The aerosol-generating article may have an external diameter of at least 5 millimetres. The aerosol-generating article may have an external diameter of at least 6 millimetres. The aerosol-generating article may have an external diameter of at least 7 millimetres.

The aerosol-generating article may have an external diameter of less than equal to 12 millimetres The aerosol-generating article may have an external diameter of less than equal to 10 millimetres The aerosol-generating article may have an external diameter of less than equal to 8 millimetres.

The aerosol-generating article may have an external diameter of between 5 millimetres and 12 millimetres. The aerosol-generating article may have an external diameter of between 6 millimetres and 10 millimetres. The aerosol-generating article may have an external diameter of between 7 millimetres and 8 millimetres.

The external diameter of the aerosol-generating article may be substantially constant over the whole length of the aerosol-generating article. As an alternative, different portions of the aerosol-generating article may have different external diameters.

The hollow tubular element may have a length of at least 15 millimetres. The hollow tubular element may have a length of at least 17 millimetres. The hollow tubular element may have a length of at least 19 millimetres.

The hollow tubular element may have a length of less than or equal to 30 millimetres. The hollow tubular element may have a length of less than or equal to 25 millimetres. The hollow tubular element may have a length of less than or equal to 23 millimetres.

The hollow tubular element may have a length of between 15 millimetres and 30 millimetres. The hollow tubular element may have a length of between 17 millimetres and 25 millimetres. The hollow tubular element may have a length of between 19 millimetres and 23 millimetres. In one example, the length of the hollow tubular element is 12 millimetres.

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 aerosolforming substrate. Providing an empty cavity downstream (preferably, immediately downstream) of the aerosol-forming substrate may enhance the nucleation of aerosol particles generated by the substrate. Providing a relatively long cavity maximises such nucleation benefits, thereby improving aerosol formation and cooling.

The thickness of a peripheral wall (in other words, the wall thickness) of the hollow tubular element may be at least 100 micrometres. The wall thickness of the hollow tubular element may be at least 150 micrometres. The wall thickness of the hollow tubular element may be at least 200 micrometres. The wall thickness of the hollow tubular element may be at least 250 micrometres. The wall thickness of the hollow tubular element may be at least 500 micrometres.

The wall thickness of the hollow tubular element may be less than or equal to 2 millimetres. The wall thickness of the hollow tubular element may be less than or equal to 1 .5 millimetres. The wall thickness of the hollow tubular element may be less than or equal to 1.25 millimetres. The wall thickness of the hollow tubular element may be less than or equal to 1 millimetre. The wall thickness of the hollow tubular element may be less than or equal to 500 micrometres.

The wall thickness of the hollow tubular element may between 100 micrometres and 2 millimetres. The wall thickness of the hollow tubular element may between 150 micrometres and 1.5 millimetres. The wall thickness of the hollow tubular element may between 200 micrometres and 1.25 millimetres.

The wall thickness of the hollow tubular element may be 250 micrometres.

Keeping the thickness of the peripheral wall of the hollow tubular element relatively low may ensure that the overall internal volume of the hollow tubular segment - which is made available for the aerosol to begin the nucleation process as soon as the aerosol components leave the rod of aerosol-forming substrate - and the cross-sectional surface area of the hollow tubular segment are effectively maximised, whilst at the same time ensuring that the hollow tubular segment has the necessary structural strength to prevent a collapse of the aerosolgenerating article as well as to provide some support to the rod of aerosol-forming substrate, and that the resistance to draw of the hollow tubular element is minimised. Greater values of cross-sectional surface area of the cavity of the hollow tubular element may be understood to be associated with a reduced speed of the aerosol stream travelling along the aerosolgenerating article, which is also expected to favour aerosol nucleation. Further, by utilising a hollow tubular element having a relatively low thickness, it may be possible to substantially prevent diffusion of ventilation air prior to its contacting and mixing with the stream of aerosol, which is also understood to further favour nucleation phenomena. In practice, by providing a more controllably localised cooling of the stream of volatilised species, it may be possible to enhance the effect of cooling on the formation of new aerosol particles.

The hollow tubular element may an outer diameter that is approximately equal to the outer diameter of the rod of aerosol-forming substrate and to the outer diameter of the aerosolgenerating article.

The hollow tubular element may have an external diameter of between 5 millimetres and 12 millimetres. The hollow tubular element may have an external diameter of between 5 millimetres and 10 millimetres. The hollow tubular element may have an external diameter of between 6 millimetres and 8 millimetres. The hollow tubular element may have an outer diameter of external diameter of 7.2 millimetres plus or minus 10 percent.

The hollow tubular element may have an internal diameter. The hollow tubular element may have a constant internal diameter along a length of the hollow tubular element. However, the internal diameter of the hollow tubular element may vary along the length of the hollow tubular element.

The hollow tubular element may have an internal diameter of at least 2 millimetres. The hollow tubular element may have an internal diameter of at least 4 millimetres. The hollow tubular element may have an internal diameter of at least 5 millimetres. The hollow tubular element may have an internal diameter of at least 7 millimetres.

The provision of a hollow tubular element having an internal diameter as set out above may advantageously provide sufficient rigidity and strength to the hollow tubular element.

The hollow tubular element may have an internal diameter of no more than about 10 millimetres. For example, the hollow tubular element may have an internal diameter of no more than 9 millimetres. The hollow tubular element may have an internal diameter of no more than 8 millimetres. The hollow tubular element may have an internal diameter of no more than about 7.5 millimetres.

The provision of a hollow tubular element having an internal diameter as set out above may advantageously reduce the resistance to draw of the hollow tubular segment.

The hollow tubular element may have an internal diameter of between 2 millimetres and about 10 millimetres. The hollow tubular element may have an internal diameter of between 4 millimetres and about 9 millimetres. The hollow tubular element may have an internal diameter of between 5 millimetres and about 8 millimetres. The hollow tubular element may have an internal diameter of between 6 millimetres and about 7.5 millimetres. The hollow tubular element may have an external diameter of 7.1 or 7.2 millimetres. The hollow tubular element may have an internal diameter of 6.7 millimetres.

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 provides a balance between being deformable in order to provide ease of insertion of the article into an aerosol-generating device and being sufficiently stiff to provide suitable engagement of the article with the interior of the device. A cardboard tube may therefore provide suitable resistance to deformation or compression during use.

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

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 cellulosic film. The hollow tubular element may comprise low density polyethylene (LDPE) or polyhydroxyalkanoate (PHA) fibres. The hollow tubular element may comprise cellulose acetate tow.

The mouthpiece element may be located at the downstream end of the aerosolgenerating article. The downstream end of the mouthpiece element may define the downstream end of the aerosol-generating article.

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

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

The fibrous filtration material may be for filtering the aerosol that is generated from the aerosol-forming substrate. Suitable fibrous filtration materials would be known to the skilled person. The at least one mouthpiece filter segment may comprise a cellulose acetate filter segment formed of cellulose acetate tow. The mouthpiece element may consist 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 an abutting end to end relationship with each other.

The mouthpiece element may comprise a flavourant. The flavourant may be provided in any suitable form. For example, the mouthpiece element may comprise one or more capsules, beads or granules of a flavourant, or one or more flavour loaded threads or filaments.

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

The mouthpiece element may be circumscribed by a plug wrap. The mouthpiece element may be unventilated such that air does not enter the aerosol-generating article along the mouthpiece element.

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

The mouthpiece element may have an external diameter that is approximately equal to the external diameter of the aerosol-generating article. The diameter of a mouthpiece element (or mouthpiece filter segment) may be substantially the same as the outer diameter of the hollow tubular element. As mentioned in the present disclosure, the outer diameter of the hollow tubular element may be about 7.2 millimetre, plus or minus 10 percent.

The mouthpiece element may have a length of at least 3 millimetres. The mouthpiece element may have a length of at least 5 millimetres.

The mouthpiece element may have a length of less than or equal to 11 millimetres. The mouthpiece element may have a length of less than or equal to 9 millimetres. The mouthpiece element may have a length of less than or equal to 7 millimetres.

The mouthpiece element may have a length of between 3 millimetres and 11 millimetres. The mouthpiece element may have a length of between 5 millimetres and 9 millimetres.

The mouthpiece element may have a length of 7 millimetres.

The mouthpiece element may have an external diameter of between 5 millimetres and 10 millimetres. The mouthpiece element may have an external diameter of between 6 millimetres and 8 millimetres. The mouthpiece element may have an external diameter of between 7 millimetres and 8 millimetres. The mouthpiece element may have an external diameter of 7.2 millimetres, plus or minus 10 percent. The mouthpiece element may have an external diameter of 7.25 millimetres, plus or minus 10 percent. The aerosol-generating article may comprise a ventilation zone. The ventilation zone may be provided at a location along the hollow tubular element.

A distance between the ventilation zone and an upstream end of the aerosolgenerating article may be at least 26 millimetres. A distance between the ventilation zone and an upstream end of the aerosol-generating article may be at least 28 millimetres. A distance between the ventilation zone and an upstream end of the aerosol-generating article may be at least 30 millimetres.

A distance between the ventilation zone and an upstream end of the aerosolgenerating article may be less than or equal to 33 millimetres. A distance between the ventilation zone and an upstream end of the aerosol-generating article may be less than or equal to 31 millimetres.

A distance between the ventilation zone and an upstream end of the aerosolgenerating article may be between 26 millimetres and 33 millimetres. A distance between the ventilation zone and an upstream end of the aerosol-generating article may be between 28 millimetres and 31 millimetres.

Such, or any, ventilation zone may extend through the peripheral wall of the hollow tubular element. As such, fluid communication is established between the flow channel internally defined by the hollow tubular element and the outer environment.

Unless otherwise specified, the resistance to draw (RTD) of a component or the aerosol-generating article is measured in accordance with ISO 6565-2015. The RTD refers the pressure required to force air through the full length of a component. The terms “pressure drop” or “draw resistance” of a component or article may also refer to the “resistance to draw”. Such terms generally refer to the measurements in accordance with ISO 6565-2015 are normally carried out at under test at a volumetric flow rate of about 17.5 millilitres per second at the output or downstream end of the measured component at a temperature of about 22 degrees Celsius, a pressure of about 101 kPa (about 760 T orr) and a relative humidity of about 60%.

In the context of the present invention, a hollow tubular element provides an unrestricted flow channel. This means that the hollow tubular element provides a negligible level of resistance to draw (RTD). The term “negligible level of resistance to draw” is used to describe a resistance to draw of less than 1 mm H2O per 10 millimetres of length of the hollow tubular element, preferably less than 0.4 mm H2O per 10 millimetres of length of the hollow tubular element, more preferably less than 0.1 mm H2O per 10 millimetres of length of the hollow tubular element.

The resistance to draw of the hollow tubular element is preferably less than or equal to about 10 millimetres H2O. More preferably, the resistance to draw of the hollow tubular element is less than or equal to about 5 millimetres H2O. Even more preferably, the resistance to draw of the hollow tubular element is less than or equal to about 2.5 millimetres H2O. Even more preferably, the resistance to draw of the hollow tubular element is less than or equal to about 2 millimetres H2O. Even more preferably, the resistance to draw of the hollow tubular element is less than or equal to about 1 millimetre H2O.

The resistance to draw of a hollow tubular element may be at least 0 millimetres H2O, or at least about 0.25 millimetres H2O or at least about 0.5 millimetres H2O or at least about 1 millimetre H2O.

The resistance to draw of the hollow tubular element may be from about 0 millimetres H2O to about 10 millimetres H2O, preferably from about 0.25 millimetres H2O to about 10 millimetres H2O, preferably from about 0.5 millimetres H2O to about 10 millimetres H2O.

Th resistance to draw of the hollow tubular element may be from about 0 millimetres H2O to about 5 millimetres H2O, preferably from about 0.25 millimetres H2O to about 5 millimetres H2O preferably from about 0.5 millimetres H2O to about 5 millimetres H2O.

The resistance to draw of the hollow tubular element may be from about 1 millimetre H2O to about 5 millimetres H2O. The resistance to draw of the hollow tubular element may be from about 0 millimetres H2O to about 2.5 millimetres H2O, preferably from about 0.25 millimetres H2O to about 2.5 millimetres H2O, more preferably from about 0.5 millimetres H2O to about 2.5 millimetres H2O.

The resistance to draw of the hollow tubular element may be from about 0 millimetres H2O to about 2 millimetres H2O, preferably from about 0.25 millimetres H2O to about 2 millimetres H2O, more preferably from about 0.5 millimetres H2O to about 2 millimetres H2O.

In on example, the resistance to draw of the hollow tubular element is about 0 millimetre H2O.

The hollow tubular element may provide a resistance to draw of less than or equal to

I mm H2O.

The resistance to draw (RTD) of the mouthpiece element may be at least about 0 mm H2O. The resistance to draw of the mouthpiece element may be at least about 3 mm H2O. The RTD of the mouthpiece element may be at least about 6 mm H2O.

The resistance to draw of the mouthpiece element may be less than or equal to about 12 mm H2O. The resistance to draw of the mouthpiece element may be less than or equal to

I I mm H2O. The resistance to draw of the mouthpiece element may be less than or equal about 10 mm H2O.

The resistance to draw of the mouthpiece element may be greater than or equal to about 0 mm H2O and less than about 12 mm H2O. Preferably, the resistance to draw of the mouthpiece element may be greater than or equal to about 3 mm H2O and less than about 12 mm H2O. The resistance to draw of the mouthpiece element may be greater than or equal to about 0 mm H2O and less than about 11 mm H2O. Even more preferably, the resistance to draw of the mouthpiece element may be greater than or equal to about 3 mm H2O and less than about 11 mm H2O. Even more preferably, the resistance to draw of the mouthpiece element may be greater than or equal to about 6 mm H2O and less than about 10 mm H2O. Preferably, the resistance to draw of the mouthpiece element may be about 8 mm H2O.

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 cellulose material, such as cellulose acetate. For example, a mouthpiece element may be formed from a bundle of cellulose acetate fibres having a denier per filament between about 10 and about 15. For example, a mouthpiece element formed from relatively low density cellulose acetate tow, such as cellulose acetate tow comprising fibres of about 12 denier per filament.

The mouthpiece element may be formed of a polylactic acid based material. The mouthpiece element may be formed of a bioplastic material, preferably a starch-based bioplastic material. The mouthpiece element may be made by injection moulding or by extrusion. Bioplastic-based materials are advantageous because they are able to provide mouthpiece element structures which are simple and cheap to manufacture with a particular and complex cross-sectional profile, which may comprise a plurality of relatively large air flow channels extending through the mouthpiece element material, that provides suitable RTD characteristics.

The mouthpiece element may be formed from a sheet of suitable material that has been crimped, pleated, gathered, woven or folded into an element that defines a plurality of longitudinally extending channels. Such sheet of suitable material may be formed of paper, cardboard, a polymer, such as polylactic acid, or any other cellulose-based, paper-based material or bioplastic-based material. A cross-sectional profile of such a mouthpiece element may show the channels as being randomly oriented.

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, moulding, lamination, injection, or shredding of a suitable material. Thus, it is preferred that there is a low-pressure drop (or RTD) from an upstream end of the mouthpiece element to a downstream end of the mouthpiece element.

The rod of aerosol-forming substrate may be the most upstream part of the aerosolgenerating article. The aerosol-forming substrate may have a density of at least 150 milligrams per cubic centimetre. The aerosol-forming substrate may have a density of at least 175 milligrams per cubic centimetre. The aerosol-forming substrate may have a density of at least 200 milligrams per cubic centimetre. The aerosol-forming substrate may have a density of at least 250 milligrams per cubic centimetre.

The aerosol-forming substrate may have a density of less than or equal to 500 milligrams per cubic centimetre. The aerosol-forming substrate may have a density of less than or equal to 450 milligrams per cubic centimetre. The aerosol-forming substrate may have a density of less than or equal to 400 milligrams per cubic centimetre. The aerosol-forming substrate may have a density of less than or equal to 350 milligrams per cubic centimetre.

The aerosol-forming substrate may have a density of between 150 milligrams per cubic centimetre and 500 milligrams per cubic centimetre. The aerosol-forming substrate may have a density of between 175 milligrams per cubic centimetre and 450 milligrams per cubic centimetre. The aerosol-forming substrate may have a density of between 200 milligrams per cubic centimetre and 400 milligrams per cubic centimetre. The aerosol-forming substrate may have a density of between 250 milligrams per cubic centimetre and 350 milligrams per cubic centimetre.

The aerosol-forming substrate may comprise at least 80 milligrams of aerosol-forming substrate. The aerosol-forming substrate may comprise at least 100 milligrams of aerosolforming substrate. The aerosol-forming substrate may comprise at least 150 milligrams of aerosol-forming substrate. The aerosol-forming substrate may comprise at least 200 milligrams of aerosol-forming substrate.

The rod of aerosol-forming substrate may comprise less than or equal to 400 milligrams of aerosol-forming substrate. The rod of aerosol-forming substrate may comprise less than or equal to 350 milligrams of aerosol-forming substrate. The rod of aerosol-forming substrate may comprise less than or equal to 300 milligrams of aerosol-forming substrate. The rod of aerosol-forming substrate may comprise less than or equal to 250 milligrams of aerosolforming substrate.

The rod of aerosol-forming substrate may comprise between 80 milligrams and 400 milligrams of aerosol-forming substrate. The rod of aerosol-forming substrate may comprise between 100 milligrams and 350 milligrams of aerosol-forming substrate. The rod of aerosolforming substrate may comprise between 150 milligrams and 250 milligrams of aerosolforming substrate.

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 aerosolforming 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 aerosolgenerating 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.

The weight of the rod of aerosol-forming substrate may be less than or equal to 80 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 less than or equal to 75 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 less than or equal to 70 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 less than or equal to 65 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 less than or equal to 60 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 less than or equal to 55 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 less than or equal to 50 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 between 25 percent and 80 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 between 30 percent and 75 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 between 35 percent and 70 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 between 45 percent and 65 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 between 50 percent and 60 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 between 50 percent and 55 percent of the weight of the aerosol-generating article on a dry weight basis.

The rod of aerosol-forming substrate may comprise shredded tobacco material. The rod of aerosol-forming substrate may comprise tobacco cut filler. The tobacco cut filler may have a density of at least 150 milligrams per cubic centimetre. The tobacco cut filler may have a density of at least 175 milligrams per cubic centimetre. The tobacco cut filler may have a density of at least 200 milligrams per cubic centimetre. The tobacco cut filler may have a density of at least 250 milligrams per cubic centimetre.

The tobacco cut filler may have a density of less than or equal to 500 milligrams per cubic centimetre. The tobacco cut filler may have a density of less than or equal to 450 milligrams per cubic centimetre. The tobacco cut filler may have a density of less than or equal to 400 milligrams per cubic centimetre. The tobacco cut filler may have a density of less than or equal to 350 milligrams per cubic centimetre.

The tobacco cut filler may have a density of between 150 milligrams per cubic centimetre and 500 milligrams per cubic centimetre. The tobacco cut filler may have a density of between 175 milligrams per cubic centimetre and 450 milligrams per cubic centimetre. The tobacco cut filler may have a density of between 200 milligrams per cubic centimetre and 400 milligrams per cubic centimetre. The tobacco cut filler may have a density of between 250 milligrams per cubic centimetre and 350 milligrams per cubic centimetre.

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.

The rod of aerosol-forming substrate may comprise less than or equal to 400 milligrams of tobacco cut filler. The rod of aerosol-forming substrate may comprise less than or equal to 350 milligrams of tobacco cut filler. The rod of aerosol-forming substrate may comprise less than or equal to 300 milligrams of tobacco cut filler. The rod of aerosol-forming substrate may comprise less than or equal to 250 milligrams of tobacco cut filler.

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

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.

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 r 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 aerosolgenerating 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.

The weight of the tobacco cut filler may be less than or equal 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 less than or equal 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 less than or equal 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 less than or equal 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 less than or equal 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 less than or equal to 55 percent of the weight of the aerosolgenerating article on a dry weight basis. The weight of the tobacco cut filler may be less than or equal to 50 percent of the weight of the aerosol-generating article on a dry weight basis.

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

The rod of aerosol-forming substrate may have a length of at least 15 millimetres. The rod of aerosol-forming substrate may have a length of at least 16 millimetres.

The rod of aerosol-forming substrate may have a length of less than or equal to 30 millimetres. The rod of aerosol-forming substrate may have a length of less than or equal to 25 millimetres. The rod of aerosol-forming substrate may have a length of less than or equal to 20 millimetres.

The rod of aerosol-forming substrate may have a length of between 15 millimetres and 30 millimetres. The rod of aerosol-forming substrate may have a length of between 16 millimetres and 25 millimetres. The rod of aerosol-forming substrate may have a length of between 16 millimetres and 20 millimetres. The rod of aerosol-forming substrate may have a length of between 17 millimetres and 19 millimetres.

In one example, the rod of aerosol-forming substrate may have a length of 17 millimetres.

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 may comprise a heating chamber for receiving the aerosolgenerating article. The aerosol-generating device may comprise a heating member arranged at or about a periphery of the heating chamber. The aerosol-generating device may comprise a heating element. The heating element may be provided at or about a periphery of the heating chamber. The heater may preferably be arranged to externally heat the rod of aerosol-forming substrate.

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

The heating element may externally heat the aerosol-generating article when received within the aerosol-generating device. Such an external heater may circumscribe the aerosolgenerating article when inserted in or received within the aerosol-generating device.

The heating element may be arranged to heat the outer surface of the aerosol-forming substrate. The heater may be arranged for insertion into an aerosol-forming substrate when the aerosol-forming substrate is received within the heating chamber. The heating element may be positioned within the heating chamber.

The heating element may comprise at least one heating element. The at least one heating element may be any suitable type of heating element. The aerosol-generating device may comprises only one heating element. The aerosol-generating device may comprise a plurality of heating elements. The heating element may comprise at least one resistive heating element. The heating element may comprise a plurality of resistive heating elements. The resistive heating elements may be electrically connected in a parallel arrangement. Advantageously, providing a plurality of resistive heating elements electrically connected in a parallel arrangement may facilitate the delivery of a desired electrical power to the heater while reducing or minimising the voltage required to provide the desired electrical power. Advantageously, reducing or minimising the voltage required to operate the heating elements may facilitate reducing or minimising the physical size of the power supply.

Suitable materials for forming the at least one resistive heating element include but are not limited to: semiconductors such as doped ceramics, electrically ‘conductive’ ceramics (such as, for example, molybdenum disilicide), carbon, graphite, metals, metal alloys and composite materials made of a ceramic material and a metallic material. Such composite materials may comprise doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbides. Examples of suitable metals include titanium, zirconium, tantalum and metals from the platinum group. Examples of suitable metal alloys include stainless steel, nickel-, cobalt-, chromium-, aluminium- titanium- zirconium-, hafnium-, niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese- and iron-containing alloys, and super-alloys based on nickel, iron, cobalt, stainless steel, Timetai® and iron- manganese-aluminium based alloys.

The at least one resistive heating element may comprise one or more stamped portions of electrically resistive material, such as stainless steel. Alternatively, the at least one resistive heating element may comprise a heating wire or filament, for example a Ni-Cr (Nickel- Chromium), platinum, tungsten or alloy wire.

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

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 (AI2O3) or Zirconia (ZrCh). Preferably, the electrically insulating substrate has a thermal conductivity of less than or equal to about 40 Watts per metre Kelvin, preferably less than or equal to about 20 Watts per metre Kelvin and ideally less than or equal to about 2 Watts per metre Kelvin.

The heater may comprise a heating element comprising a rigid electrically insulating substrate with one or more electrically conductive tracks or wire disposed on its surface. The size and shape of the electrically insulating substrate may allow it to be inserted directly into an aerosol-forming substrate. If the electrically insulating substrate is not sufficiently rigid, the heating element may comprise a further reinforcement means. A current may be passed through the one or more electrically conductive tracks to heat the heating element and the aerosol-forming substrate.

The heating element may comprise an inductive heating arrangement. The inductive heating arrangement may comprise an inductor coil and a power supply configured to provide high frequency oscillating current to the inductor coil. As used herein, a high frequency oscillating current means an oscillating current having a frequency of between about 500 kHz and about 30 MHz. The heater may advantageously comprise a DC/AC inverter for converting a DC current supplied by a DC power supply to the alternating current. The inductor coil may be arranged to generate a high frequency oscillating electromagnetic field on receiving a high frequency oscillating current from the power supply. The inductor coil may be arranged to generate a high frequency oscillating electromagnetic field in the heating chamber. In some embodiments, the inductor coil may substantially circumscribe the heating chamber. The inductor coil may extend at least partially along the length of the heating chamber.

The heating element may comprise an inductive heating element. The inductive heating element may be a susceptor element. As used herein, the term 'susceptor element' refers to an element comprising a material that is capable of converting electromagnetic energy into heat. When a 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.

A susceptor element may be arranged such that, when the aerosol-generating article is received in the heating chamber of the aerosol-generating device, the oscillating electromagnetic field generated by the inductor coil induces a current in the susceptor element, causing the susceptor element to heat up. In these embodiments, the aerosolgenerating device is preferably capable of generating a fluctuating electromagnetic field having a magnetic field strength (H-field strength) of between 1 and 5 kilo amperes per metre (kA m), preferably between 2 and 3 kA/m, for example about 2.5 kA/m. The electrically- operated aerosol-generating device is preferably capable of generating a fluctuating electromagnetic field having a frequency of between 1 and 30 MHz, for example between 1 and 10 MHz, for example between 5 and 7 MHz.

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

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

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

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

The length of the heating element may be at least 25 percent of the length of the rod of aerosol-forming substrate. The length of the heating element may be at least 30 percent of the length of the rod of aerosol-forming substrate. The length of the heating element may be at least 35 percent of the length of the rod of aerosol-forming substrate. The length of the heating element may be at least 40 percent of the length of the rod of aerosol-forming substrate. The length of the heating element may be at least 45 percent of the length of the rod of aerosol-forming substrate. The length of the heating element may be at least 50 percent of the length of the rod of aerosol-forming substrate. The length of the heating element may be between 25 percent of the length of the rod of aerosol-forming substrate and 95 percent of the length of the rod of aerosol-forming substrate. The length of the heating element may be between 50 percent of the length of the rod of aerosol-forming substrate and 90 percent of the length of the rod of aerosol-forming substrate. The length of the heating element may be between 60 percent of the length of the rod of aerosol-forming substrate and 80 percent of the length of the rod of aerosol-forming substrate.

Advantageously, optimising the length of the length of the rod of aerosol-forming substrate with respect to the length of the heating element may increase aerosol generating and provide a prolonged user experience.

The aerosol-generating article may comprise a housing. The housing may be a rigid housing.

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 a mouth, or proximal, end. The distal end of the heating chamber may be a closed end and the mouth, or proximal, end of the heating chamber may be an open end. An aerosol-generating article may be inserted into the device cavity, or heating chamber, via the open end of the heating chamber. The heating chamber may be cylindrical in shape so as to conform to the same shape of an aerosol-generating article.

The expression “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 expression “aerosol-generating article is received within the heating chamber” refers to the aerosolgenerating article being fully or partially received within the heating chamber of the aerosolgenerating 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 in substantial proximity to the distal end of the heating chamber. The distal end of the heating chamber may be defined by an end-wall.

The heating chamber may be configured to establish a tight fit with an aerosolgenerating article received within the heating chamber. Tight fit may refer to a snug fit. The aerosol-generating device may comprise a peripheral wall. Such a peripheral wall may the heating chamber. The peripheral wall defining the heating chamber may be configured to engage with an aerosol-generating article received within the heating chamber in a tight fit manner, so that there is substantially no gap or empty space between the peripheral wall defining the heating chamber and the aerosol-generating article when received within the aerosol-generating device. Such a tight fit may establish an airtight fit or configuration between the heating chamber and an aerosol-generating article received therein.

With such an airtight configuration, there would be substantially no gap or empty space between the peripheral wall defining the heating chamber and the aerosol-generating article for air to flow through.

The tight fit with an 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.

The aerosol-generating device may comprise an air-flow channel extending between a channel inlet and a channel outlet. The air-flow channel may be configured to establish a fluid communication between the interior of the heating chamber and the exterior of the aerosol-generating device. The air-flow channel of the aerosol-generating device may be defined within the housing of the aerosol-generating device to enable fluid communication between the interior of the heating chamber and the exterior of the aerosol-generating device. When an aerosol-generating article is received within the heating chamber, the air-flow channel may be configured to provide air flow into the article in order to deliver generated aerosol to a user drawing from the mouth end of the article.

The air-flow 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 air-flow 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 air-flow channel may partially be defined by the inner surface of the peripheral wall and may be partially defined within the thickness of the peripheral wall. The inner surface of the peripheral wall defines a peripheral boundary of the heating chamber.

The air-flow channel of the aerosol-generating device may extend from an inlet located at the mouth end, or proximal end, of the aerosol-generating device to an outlet located away from mouth end of the device. The air-flow channel may extend along a direction parallel to the longitudinal axis of the aerosol-generating device.

The aerosol-generating device may comprise a power supply. The power supply may be a DC power supply. The power supply may be a battery. The power supply may be a nickel- metal hydride battery, a nickel cadmium battery, or a lithium based battery, for example a lithium-cobalt, a lithium-iron-phosphate or a lithium-polymer battery. However, in some embodiments the power supply may be another form of charge storage device, such as a capacitor. The power supply may require recharging and may have a capacity that allows for the storage of enough energy for one or more user operations, for example one or more aerosol-generating experiences. For example, the power supply may have sufficient capacity to allow for continuous heating of an aerosol-generating substrate for a period of around six minutes, corresponding to the typical time taken to smoke a conventional cigarette, or for a period that is a multiple of six minutes. In another example, the power supply may have sufficient capacity to allow for a predetermined number of puffs or discrete activations of the heating element.

Below, there is provided a non-exhaustive list of non-limiting examples. Any one or more of the features of these examples may be combined with any one or more features of another example, embodiment, or aspect described herein.

EX1 . 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 a 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 wherein the rod of aerosol-forming substrate has a tobacco content of between 30 percent by weight on dry weight basis and 90 percent by weight on a dry weight basis.

EX2. An aerosol-generating article according to any preceding example, wherein the length of the rod of aerosol-forming substrate is at least 37 percent of the length of the aerosolgenerating article.

EX3. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate has a tobacco content of between 40 percent by weight on dry weight basis and 85 percent by weight on a dry weight basis.

EX4. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate has a tobacco content of between 50 percent by weight on dry weight basis and 80 percent by weight on a dry weight basis.

EX5. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate comprises one of more flavourants.

EX6. An aerosol-generating article according to example EX5, wherein the rod of aerosolforming substrate has a flavourant content of at least 0.1 percent by weight on a dry weight basis. EX7. An aerosol-generating article according to example EX6, wherein the rod of aerosolforming substrate has a flavourant content of at least 5 percent by weight on a dry weight basis.

EX8. An aerosol-forming substrate according to example EX7, wherein the rod of aerosolforming substrate has a flavourant content of at least 10 percent by weight on a dry weight basis.

EX9. An aerosol-generating article according to example EX8, wherein the rod of aerosolforming substrate has a flavourant content of at least 15 percent by weight on a dry weight basis.

EX10. An aerosol-generating article according to example EX9, wherein the rod of aerosolforming substrate has a flavourant content of at least 20 percent by weight on a dry weight basis.

EX11. An aerosol-generating article according to example EX5, wherein the rod of aerosolforming substrate has a flavourant content of less than or equal to 25 percent by weight on a dry weight basis.

EX12. An aerosol-generating article according to example EX11, wherein the rod of aerosolforming substrate has a flavourant content of less than or equal to 20 percent by weight on a dry weight basis.

EX13. An aerosol-generating article according to example EX12, wherein the rod of aerosolforming substrate has a flavourant content of less than or equal to 15 percent by weight on a dry weight basis.

EX14. An aerosol-generating article according to example 13, wherein the rod of aerosolforming substrate has a flavourant content of less than or equal to 13 percent by weight on a dry weight basis.

EX15. An aerosol-generating article according to example EX14, wherein the rod of aerosolforming substrate has a flavourant content of less than or equal to 10 percent by weight on a dry weight basis. EX16. An aerosol-generating article according to example EX5, wherein the rod of aerosolforming substrate has a flavourant content of between 0.1 and 25 percent by weight on a dry weight basis.

EX17. An aerosol-generating article according to example EX16, wherein the rod of aerosolforming substrate has a flavourant content of between 0.1 and 20 percent by weight on a dry weight basis.

EX18. An aerosol-generating article according to example EX17, wherein the rod of aerosolforming substrate has a flavourant content of between 5 and 20 percent by weight on a dry weight basis.

EX19. An aerosol-generating article according to example EX18, wherein the rod of aerosolforming substrate has a flavourant content of between 10 and 20 percent by weight on a dry weight basis.

EX20. An aerosol-generating article according to example EX19, wherein the rod of aerosolforming substrate has a flavourant content of between 15 and 20 percent by weight on a dry weight basis.

EX21. An aerosol-generating article according to any one of examples EX5 to EX20, wherein the one or more flavourants is one or more of: clove, ginger, mint, rosemary, star anise, and tea.

EX22. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate comprises one of more aerosol formers, and wherein the rod of aerosol-forming substrate has an aerosol former content of at least 5 percent by weight on a dry weight basis.

EX23. An aerosol-generating article according to example EX22, wherein the rod of aerosolforming substrate has an aerosol former content of at least 10 percent by weight on a dry weight basis. EX24. An aerosol-generating article according to example EX23, wherein the rod of aerosolforming substrate has an aerosol former content of at least 15 percent by weight on a dry weight basis.

EX25. An aerosol-generating article according to any one of examples EX22 to EX24, wherein the rod of aerosol-forming substrate has an aerosol former content of less than or equal to 30 percent by weight on a dry weight basis.

EX26. An aerosol-generating article according to example EX25, wherein the rod of aerosolforming substrate has an aerosol former content of less than or equal to 25 percent by weight on a dry weight basis.

EX27. An aerosol-generating article according to example EX26, wherein the rod of aerosolforming substrate has an aerosol former content of less than or equal to 20 percent by weight on a dry weight basis.

EX28. An aerosol-generating article according to any preceding example, wherein the aerosol-generating article has a length of at least 38 millimetres.

EX29. An aerosol-generating article according to example EX28, wherein the aerosolgenerating article has a length of at least 40 millimetres.

EX30. An aerosol-generating article according to example E29, wherein the aerosolgenerating article has a length of at least 42 millimetres.

EX31. An aerosol-generating article according to any preceding example, wherein the aerosol-generating article has a length of less than or equal to 70 millimetres.

EX32. An aerosol-generating article according to example EX31, wherein the aerosolgenerating article has a length of less than or equal to 60 millimetres.

EX33. An aerosol-generating article according to example EX32, wherein the aerosolgenerating article has a length of less than or equal to 50 millimetres.

EX34. An aerosol-generating article according to example EX33, wherein the aerosolgenerating article has a length of less than or equal to 45 millimetres. EX35. An aerosol-generating article according to any preceding example, wherein the hollow tubular element has a length of at least 15 millimetres.

EX36. An aerosol-generating article according to example EX35, wherein the hollow tubular element has a length of at least 17 millimetres.

EX37. An aerosol-generating article according to example EX36, wherein the hollow tubular element has a length of at least 19 millimetres.

E38. An aerosol-generating article according to any preceding example, wherein the hollow tubular element has a length of less than or equal to 30 millimetres.

EX39. An aerosol-generating article according to example EX38, wherein the hollow tubular element has a length of less than or equal to 25 millimetres.

EX40. An aerosol-generating article according to example EX39, wherein the hollow tubular element has a length of less than or equal to 23 millimetres.

EX41. An aerosol-generating article according to any preceding example, wherein the mouthpiece element has a length of at least 3 millimetres.

EX42. An aerosol-generating article according to example EX41, wherein the mouthpiece element has a length of at least 5 millimetres.

EX43. An aerosol-generating article according to any preceding example, wherein the mouthpiece element has a length of less than or equal to 11 millimetres.

EX44. An aerosol-generating article according to example EX43, wherein the mouthpiece element has a length of less than or equal to 9 millimetres.

EX45. An aerosol-generating article according to example EX44, wherein the mouthpiece element has a length of less than or equal to 7 millimetres.

EX46. An aerosol-generating article according to any preceding example, comprising a ventilation zone at a location along the hollow tubular element. EX47. An aerosol-generating article according to any preceding example, wherein the hollow tubular element provides a resistance to draw of less than or equal to 1 mm H2O.

EX48. An aerosol-generating article according to any preceding example, wherein the mouthpiece element provides a resistance to draw of at least about 3 mm H2O.

EX49. An aerosol-generating article according to example EX48, wherein the mouthpiece element provides a resistance to draw of at least about 6 mm H2O.

EX50. An aerosol-generating article according to any preceding example, wherein the mouthpiece element provides a resistance to draw of less than or equal to 12 mm H2O.

EX51. An aerosol-generating article according to example EX50, wherein the mouthpiece element provides a resistance to draw of less than or equal to 10 mm H2O.

EX52. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate is the most upstream part of the aerosol-generating article.

EX53. An aerosol-generating article according to any preceding example, wherein the aerosol-forming substrate has a density of at least 150 milligrams per cubic centimetre.

EX54. An aerosol-generating article according to any preceding example, wherein the aerosol-forming substrate has a density of less than or equal to 500 milligrams per cubic centimetre.

EX55. An aerosol-generating article according to any preceding example, wherein the aerosol-forming substrate has a density of between 150 milligrams per cubic centimetre and 500 milligrams per cubic centimetre.

EX56. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate comprises at least 80 milligrams of aerosol-forming substrate.

EX57. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate comprises less than or equal to 400 milligrams of aerosol-forming substrate. EX58. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate comprises between 150 milligrams and 250 milligrams of aerosolforming substrate.

EX59. An aerosol-generating article according to any preceding example, wherein the weight of the rod of aerosol-forming substrate is at least 45 percent of the weight of the aerosolgenerating article on a dry weight basis.

EX60. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate comprises tobacco cut filler.

EX61. An aerosol-generating article according to example EX60, wherein the tobacco cut filler has a density of at least 150 milligrams per cubic centimetre.

EX62. An aerosol-generating article according to example EX60, wherein the tobacco cut filler has a density of less than or equal to 500 milligrams per cubic centimetre.

EX63. An aerosol-generating article according to example EX60, wherein the tobacco cut filler has a density between 150 milligrams per cubic centimetre and 500 milligrams per cubic centimetre.

EX64. An aerosol-generating article according to example EX60, wherein the rod of aerosolforming substrate comprises at least 80 milligrams of tobacco cut filler.

EX65. An aerosol-generating article according to example EX60, wherein the rod of aerosolforming substrate comprises less than or equal to 400 milligrams of tobacco cut filler.

EX66. An aerosol-generating article according to example EX60, wherein the rod of aerosolforming substrate comprises between 150 milligrams and 250 milligrams of tobacco cut filler.

EX67. An aerosol-generating article according to example EX60, 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. EX68. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate has a length of at least 15 millimetres.

EX69. An aerosol-generating article according to example EX68, wherein the rod of aerosolforming substrate has a length of 17 millimetres.

EX70. An aerosol-generating article according to any preceding example, wherein the rod of aerosol-forming substrate has a length of less than or equal to 30 millimetres.

EX71. An aerosol-generating article according to example EX70, wherein the rod of aerosolforming substrate has a length of less than or equal to 20 millimetres.

EX72. An aerosol-generating article according to any preceding example, wherein the aerosol-generating article has an external diameter of at least 5 millimetres.

EX73. An aerosol-generating article according to example EX72, wherein the aerosolgenerating article has an external diameter of at least 7 millimetres.

EX74. An aerosol-generating article according to any preceding example, wherein the aerosol-generating article has an external diameter of less than equal to 10 millimetres.

EX75. An aerosol-generating article according to example EX74, wherein the aerosolgenerating article has an external diameter of less than equal to 8 millimetres.

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

Figure 1 shows a schematic side perspective view of an aerosol-generating article in accordance with an embodiment of the invention;

Figure 2 shows a schematic side sectional view of the aerosol-generating article in accordance with an embodiment of the invention; and

Figure 3 shows a schematic side sectional view of the aerosol-generating system comprising an aerosol-generating article in accordance with an embodiment of the invention and an aerosol-generating device.

The aerosol-generating article 10 shown in Figure 1 comprises a rod of aerosol-forming substrate 12 and a downstream section 14 at a location downstream of the rod 12 of aerosol- forming substrate. Thus, the aerosol-generating article 10 extends from an upstream or distal end 16 - which substantially coincides with an upstream end of the rod of aerosol-forming substrate 12 - to a downstream or mouth end 18, which coincides with a downstream end of the downstream section 14. The downstream section 14 comprises a hollow tubular element 20 and a mouthpiece element 50.

In this example, the aerosol-generating article 10 has an overall length of about 45 millimetres and an outer diameter of about 7.2 mm.

The rod of aerosol-forming substrate 12 comprises a shredded tobacco material. In this example, the rod of aerosol-forming substrate 12 also comprises clove. The rod of aerosolforming substrate 12 comprises 150 milligrams of a shredded tobacco material comprising from 13 percent by weight to 16 percent by weight of glycerine. The density of the aerosolforming substrate is about 300 mg per cubic centimetre. The RTD of the rod of aerosol-forming substrate 12 is between about 6 to 8 mm H2O. The rod of aerosol-forming substrate 12 also includes 52 milligrams of clove. The rod of aerosol-forming substrate 12 is individually wrapped by a plug wrap (not shown).

The hollow tubular element 20 is located immediately downstream of the rod 12 of aerosol-forming substrate. The hollow tubular element 20 is in longitudinal alignment with the rod 12 of aerosol-forming substrate. The upstream end of the hollow tubular element 20 abuts the downstream end of the rod 12 of aerosol-forming substrate.

The hollow tubular element 20 defines a hollow section of the aerosol-generating article 10. The hollow tubular element does not substantially contribute to the overall RTD of the aerosol-generating article. In more detail, an RTD of the hollow tubular element 20 is about 0 mm H2O.

As shown in Figure 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 internal cavity 22 that extends all the way from an upstream end of the hollow tubular element 20 to a downstream end of the hollow tubular element 20. The internal cavity 22 is substantially empty, and so substantially unrestricted airflow is enabled along the internal cavity 22. The hollow tubular element 20 does not substantially contribute to the overall RTD of the aerosolgenerating article 10.

In this example, the hollow tubular element 20 has a length of about 21 millimetres, an external diameter of about 7.2 millimetres, and an internal diameter of about 6.7 millimetres. Thus, a thickness of a peripheral wall of the hollow tubular element 20 is about 0.25 millimetres.

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

In this example, the most upstream part of the aerosol-generating article 10 is an upstream end of the rod of aerosol-forming substrate 12. As such, the aerosol-generating article 10 extends from a distal end 16 substantially coinciding with an upstream end of the rod of aerosol-forming substrate 12 to a mouth end or downstream end 18 substantially coinciding with a downstream end of the downstream section 14.

In another example, the aerosol-generating article 10 comprises an upstream element located immediately upstream of the rod of aerosol-forming substrate 12. In that example, the downstream end of the upstream element may abut against fthe 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 millimetre and defining an internal cavity 23.

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. An external 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 mm H2O. The mouthpiece element 50 may be individually wrapped by a plug wrap (not shown).

As shown in Figures 1 and 2, the aerosol-generating article 10 comprises an upstream wrapper 44 circumscribing 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 of the upstream wrapper 44 overlap the perforations provided on the hollow tubular element 20. Accordingly, the upstream wrapper 44 overlies the perforations of the ventilation zone 30 provided on the hollow tubular element 20.

The aerosol-generating article 10 also comprises a tipping wrapper 52 circumscribing 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 way, the tipping wrapper 52 effectively joins the mouthpiece element 50 to the rest of the components of the aerosol-generating article 10. In this example, the width of the tipper wrapper 52 is about 26 millimetres. Additionally, the ventilation zone 30 may comprise 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 the upstream wrapper 44. Accordingly, the tipping wrapper 52 overlies the perforations of the ventilation zone 30 provided on the hollow tubular element 20 and the upstream wrapper 44.

Figure 3 illustrates an aerosol-generating system 100 comprising an exemplary aerosol-generating device 1 and the aerosol-generating article 10, equivalent to that shown in Figures 1 and 2. Figure 3 illustrates a downstream, mouth end portion of the aerosolgenerating device 1 where the device cavity is defined and the aerosol-generating article 10 can be received. The aerosol-generating device 1 comprises a housing (or body) 4, extending between a mouth 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 an aerosol-generating article 10. The device cavity is defined by a closed, distal end and an open, mouth end. The mouth end of the device cavity is located at the mouth end of the aerosol-generating device 1 . The aerosol-generating article 10 is configured to be received through the mouth end of the device cavity and is configured to abut against a closed end of the device cavity.

A device air flow channel 5 is defined within the peripheral wall 6. The air-flow channel

5 extends between an inlet 7 located at the mouth end of the aerosol-generating device 1 and the closed end of the device cavity. Air may enter the aerosol-forming substrate 12 via an aperture (not shown) provided at the closed end of the device cavity, ensuring fluid communication between the air flow channel 5 and the aerosol-forming substrate 12.

The aerosol-generating device 1 further comprises a heater (not shown) and a power source (not shown) for supplying power to the heater. A controller (not shown) is also provided to control such supply of 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 when the aerosol-generating article 10 is received within the aerosol-generating device 1.

In the embodiment shown in Figure 3, the device cavity defined by the peripheral wall

6 is 28 mm in length. When the article 10 is received within the device cavity, the rod of aerosol-forming substrate 12 and an upstream portion of the hollow tubular element 20 are received within the device cavity. Such an upstream portion of the hollow tubular element 20 is 11 mm in length. Accordingly, about 28 mm of the aerosol-generating article 10 is received within the aerosol-generating device 1 and about 17 mm of the aerosol-generating article 10 is located outside of 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 therein. Such a length PL of the aerosol-generating article 10 protruding from the aerosol-generating device 1 is shown in Figure 3.

As a result, the ventilation zone 30 is advantageously located outside of the aerosolgenerating device 1 when the aerosol-generating article 10 is inserted in the aerosolgenerating device 1 . Where the device cavity is 28 mm long, the ventilation zone 30 is located 1 millimetres downstream from the mouth end 2 of the aerosol-generating device 1 when the aerosol-generating article 10 is received within the aerosol-generating device 1.

For the purpose of the present description and of the appended claims, except where otherwise indicated, all numbers expressing amounts, quantities, percentages, and so forth, are to be understood as being 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 enumerated herein. In this context, therefore, a number A is understood as A ± 10% of A. Within this context, a number A may be considered to include numerical values that are within general standard error for the measurement of the property that the number A modifies. The number A, in some instances as used in the appended claims, may deviate by the percentages enumerated above provided that the amount by which A deviates does not materially affect the basic and novel characteristic(s) 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 enumerated herein.

Claims

CLAIMS:

1 . 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 a 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, wherein the rod of aerosol-forming substrate has a tobacco content of between 30 percent by weight on dry weight basis and 90 percent by weight on a dry weight basis, wherein the aerosol-forming substrate has a density of between 150 milligrams per cubic centimetre and 500 milligrams per cubic centimetre, and wherein the rod of aerosol-forming substrate comprising tobacco cut filler.

2. An aerosol-generating article according to any preceding claim, wherein the length of the rod of aerosol-forming substrate is at least 37 percent of the length of the aerosolgenerating article.

3. An aerosol-generating article according to any preceding claim, wherein the rod of aerosol-forming substrate has a tobacco content of between 40 percent by weight on dry weight basis and 85 percent by weight on a dry weight basis.

4. An aerosol-generating article according to any preceding claim, wherein the rod of aerosol-forming substrate comprises one of more flavourants.

5. An aerosol-generating article according to claim 4, wherein the rod of aerosol-forming substrate has a flavourant content of at least 0.1 percent by weight on a dry weight basis.

6. An aerosol-generating article according to claim 5, wherein the rod of aerosol-forming substrate has a flavourant content of at least 5 percent by weight on a dry weight basis.

7. An aerosol-generating article according to claim 4, wherein the rod of aerosol-forming substrate has a flavourant content of less than or equal to 25 percent by weight on a dry weight basis.

8. An aerosol-generating article according to any one of claims 4-7, wherein the one or more flavourants is one or more of: clove, ginger, mint, rosemary, star anise, and tea.

9. An aerosol-generating article according to any preceding claim, wherein the rod of aerosol-forming substrate comprises one of more aerosol formers, and wherein the rod of aerosol-forming substrate has an aerosol former content of at least 5 percent by weight on a dry weight basis.

10. An aerosol-generating article according to any preceding claim, wherein the rod of aerosol-forming substrate has a length of less than or equal to 30 millimetres.

11. An aerosol-generating article according to any preceding claim, wherein the aerosolgenerating article has an external diameter of at least 5 millimetres.

12. An aerosol-generating article according to any preceding claim, wherein the rod of aerosol-forming substrate has a density of between less than 350 milligrams per cubic centimetre.

13. An aerosol-generating system comprising: an aerosol-generating article according to any one of claims 1 to 12; and an aerosol-generating device comprising: a heating chamber for receiving the aerosol-generating device; and a heating element, wherein the heating element has a length that is less than the length of the rod of aerosol-forming substrate.

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

15. An aerosol-generating system according to claim 13 or claim 14, wherein the length of the heating element is between 60 percent of the length of the rod of aerosol-forming substrate and 80 percent of the length of the rod of aerosol-forming substrate.