WO2023156660A1

WO2023156660A1 - Aerosol generating article

Info

Publication number: WO2023156660A1
Application number: PCT/EP2023/054222
Authority: WO
Inventors: Oswaldo PEREZ; Cecile Sinkinson
Original assignee: Jt International Sa
Priority date: 2022-02-21
Filing date: 2023-02-20
Publication date: 2023-08-24

Abstract

An aerosol generating article (10) configured for being heated but not burnt comprises an aerosol generating section and a filter section; the aerosol generating section being wrapped by a wrapper and comprising at least a tobacco-based aerosol generating substrate (14) comprising homogenized tobacco material and/or reconstituted tobacco wherein the aerosol generating section further comprises a porous aerosol generating reservoir (16) containing a foam comprising an aerosol forming agent and a foam forming agent.

Description

Aerosol Generating Article

Technical Field

The invention relates to an aerosol generating article .

Technical Background

Aerosol generating articles have become popular as a replacement for conventional smoking articles . Such articles are expected by consumers to contain nicotine and/or tobacco and at the same time produce visible vapor .

In this context , EP 3 046 431 Bl is related to an aerosol generating system with a nicotine source which can be a liquid tobacco extract . WO 2021 / 053029 Al is related to a plurality of aerosol generating substrates , and WO 2018 / 122375 Al discloses a tobacco mousse . Finally, further aerosol generating articles are known from EP 3 462 935 Bl , WO 2020/ 089067 Al and WO 2020/ 089068 Al .

Nevertheless , there remains a need for an aerosol generating article , which is improved with regard to the production of visible vapor .

Summary of the Invention

Therefore , the present invention provides an aerosol generating article , which is improved with regard to the production of visible vapor .

This is achieved by the subj ect matter of claim 1 .

Accordingly, the novel aerosol generating article is configured for being heated but not burned and comprises an aerosol generating section and a filter section . At least the aerosol generating section is wrapped by a wrapper and comprises at least a tobacco-based aerosol generating substrate comprising homogeni zed tobacco material , such as reconstituted tobacco , and optionally tobacco lamina, e . g . up to 30 wt . % by weight of the tobacco-based aerosol generating substrate . The homogeni zed tobacco material may take the form of gathered sheet , shreds , or strips . The homogeni zed tobacco material may be manufactured into sheets or strips from a slurry by paper forming technology or casting, or from a slurry or dough by extrusion and lamination . The tobacco lamina may also be in the form of shreds . Additionally, a minor amount ( e . g . , 15 wt . % or less ) of cut tobacco stems or stalks , cellulose fibre or expanded tobacco may be present . The aerosol generating section further comprises a porous aerosol generating reservoir containing a foam comprising an aerosol forming agent and a foam forming agent and, optionally a foam stabili zing agent .

By means of the tobacco-based aerosol generating substrate , tobacco taste and nicotine can be delivered, and by means of the additional aerosol generating reservoir, an increased amount of visible vapor can be produced . In this context , the foam contained in the aerosol generating reservoir can also be called a mousse or an e-mousse as it carries e-liquid similar to liquid of an e-cigarettes . As a side aspect , the tobacco substrate is essentially solid, preferably formed as a gathered sheet , shreds , strips and the like with high tobacco content , preferably tobacco in the form of agglomerated powder, and is at least preferably neither a tobacco mousse nor a capillary tobacco substrate .

The foam in the aerosol generating reservoir retains the aerosol forming agent in the mousse in a non- free liquid state and/or prevent it from leaking . In other words , there is no aerosol precursor in free-liquid state and preferably also no solid matrix or carrier in the aerosol generating reservoir . Thus , the desired effect of producing a high amount of visible vapor can be obtained without the risk of undesirable leakage of liquid of any kind from this reservoir . At the same time , by not requiring any solid matrix or carrier, ( such as ceramic or porous plastic ) the structure can be kept comparably simple , easily insertable in a paper wrapper ( i . e . , more deformable or shapable ) and biodegradable .

The ef fect obtained by the invention can also be called a visible vapor booster which will lead to a satis fying vaping experience made by the users . As already indicated, this is essentially achieved by the reservoir containing an aerosol forming agent or humectant . In particular, the aerosol generating liquid can advantageously comprise at least one component having a boiling point above 160 ° C, preferably above 175 ° C, most preferably comprised between 185 ° C and 295 ° C .

Providing an aerosol generating reservoir separate from the tobacco-based substrate overcomes the problem, that the amount of aerosol generating agent cannot be increased in the tobacco-based substrate due to manufacturability reasons . The manufacturability issues are related to the product becoming too sticky, di f ficult to handle and being wrapped and causing staining on the wrapper, when the amount of aerosol forming agent exceeds a certain value , for example 25 to 30 wt . % of the total weight of the substrate . Thus , an extra amount of visible vapor can essentially be produced by providing an aerosol generating reservoir in addition to and separate from the tobacco-based substrate . At the same time , heating of the aerosol generating reservoir can be ensured by avoiding any kind of heat barrier around or adj acent to it .

Preferred embodiments are described in the further claims .

In general , the aerosol generating reservoir can be positioned anywhere , where the desired high amount of vapor will be produced when heated . In particular, a position longitudinally and/or radially adj acent the tobacco-based substrate will be beneficial in order to ensure heating with a heater having relatively small dimensions while still covering the above-mentioned adj acent aerosol generating substrate and reservoir .

In a similar manner, the aerosol generating reservoir can have any suitable shape and can particularly be formed as a disc spanning the entire radial dimension of the wrapped inner volume of the aerosol generating article , which is typically a cylinder-shaped volume . However, the disc can also be oriented otherwise , in particular at an angle to the radial direction . Moreover, the foam can also be present in the shape of a rod, which may not necessarily cover the entire radial dimension of the article and can extend essentially in the longitudinal direction thereof or at an angle thereto . In preferred mode , the aerosol generating reservoir is formed of a cylindrical disc positioned adj acent the tobacco-based aerosol generating substrate and the ratio of the length of the aerosol generating reservoir to that of the tobacco-based aerosol generating substrate is comprised between 1 : 1 and 1 : 5 , preferably 1 : 2 and 1 : 4 .

For example , the length of the tobacco-based aerosol generating substrate is about 14 mm and the length of the aerosol generating reservoir is about 6 mm .

The aerosol generating reservoir can also comprise one or more longitudinal channels , in order to promote flow of aerosol through the reservoir .

It is currently expected that the compatibility of the tobacco-based substrate and the additional aerosol generating reservoir is particularly good, i f the reservoir is positioned downstream of the substrate . Indeed, aerosol from the reservoir can be delivered more readily without being hindered by the mass of tobacco-based substrate .

Nevertheless , both the above-indicated disc as well as multiple discrete elements , such as beads or pellets , constituting the aerosol reservoir can advantageously be embedded in the tobacco-based substrate .

As a preferred embodiment of the aerosol generating reservoir being regularly adj acent the tobacco-based substrate , the reservoir can be a thin film essentially positioned between the substrate and the outer wrapper .

A well-established aerosol forming agent can be constituted by an aerosol generating liquid which will nevertheless be contained in a way preventing leakage as indicated above .

The general idea underlying the invention of increasing the amount of visible vapor is particularly reflected in the preferred measure of the content of aerosol forming agent in the foam of the reservoir being higher than the content of aerosol forming agent in the tobacco-based substrate .

Preferably, the foam- forming agent is selected from the group consisting of :

- hydrocolloid selected from the group of agar, gellan gum, an emulsi fier selected from the group of lecithin, polyglycerol esters of fatty acids , glycerol esters of fatty acids , sorbitan esters of fatty acids ,

- and mixtures thereof . Preferably the foam- forming agent comprises or consists of gellan gum .

The amount of foam forming agent is preferably comprised between 1 and 15 wt . % in dry basis of the aerosol generating reservoir, more preferably between 2 and 10 wt . % in dry basis , most preferably between 3 and 8 wt . % in dry basis of the aerosol generating reservoir . Also , preferably, the foam-stabili zing agent is selected from the group consisting of cellulose gum, hydroxyalkylated carbohydrates , derivatives thereof , and mixtures thereof , and/or the foam stabili zing agent comprises cellulose gum, in particular carboxymethylcellulose ( CMC ) or derivatives thereof and/or cellulose fibre .

The amount of foam-stabili zing agent is preferably comprised between 8 and 30 wt . % in dry basis of the aerosol generating reservoir, preferably between 10 and 28 wt . % in dry basis , most preferably between 15 and 25 wt . % in dry basis of the aerosol generating reservoir . In an example , the foamstabili zing agent comprises between 8 and 12 wt . % in dry basis of cellulose fibre and between 8- 12 wt . % in dry basis of carboxymethylcellulose in the aerosol generating reservoir . In another example , the foam-stabili zing agent comprises between 15 and 18 wt . % carboxymethylcellulose in the aerosol generating reservoir .

With all of the above-mentioned substances , superior results with regard to forming and stabili zing the foam will be obtained .

The foams include a porous structure which is open-pored, particularly wherein the structure is essentially formed from the foam forming agent and the foam stabili zing agent .

This also applies with regard to the forming of a suf ficient amount of visible vapor, when the aerosol forming agent is present in an amount of at least 50 wt . % , preferably at least 60 wt . % , most preferred 70- 85 wt . % of the total weight in dry basis of the aerosol reservoir .

Preferably, the aerosol forming agent comprises glycol derivatives , such as propylene glycol , or glycerin or glycerol or sebacate esters or a combination thereof and preferably comprises glycerol , and/or the aerosol forming agent comprises at least 30 wt . % glycerin, preferably at least 50 wt . % glycerin and most preferred about 63 wt . % glycerin of the total weight in dry basis of aerosol forming agent . With these substances , in the described amount , a particularly good formation of visible vapor will be obtained .

The aerosol generating article described herein contains the above-described section wrapped in a wrapper . The article can further comprise a mouthpiece downstream of the tobacco-based aerosol generating substrate , which can also be contained in the wrapper . Further, the mouthpiece can comprise a filter and a spacing and/or cooling element provided between the aerosol generating section and the filter . The wrapper can for example be made from a cigarette paper and can be metalli zed or not . In either case , it can be designed to avoid scorching of the foam .

As regards the filter provided in the mouthpiece , this can be adapted to provide a relatively low, in any case , acceptable pressure drop, so that flavouring intensity and nicotine yield remain optimal . Additionally, the presence of the spacing and/or cooling element will , firstly, cool the generated aerosol , so that aerosol having an uncomfortably high temperature is prevented from entering the user ' s mouth . Moreover, by means of the spacing element the article according to the present invention can be provided with a si ze adapted to well-established aerosol generating devices , with which the article can be used . Due to the fact that the article described herein can be used with present aerosol generating devices , the users have the advantage that a single device is suf ficient and only one device has to be maintained .

The spacing may comprise a hollow tubular member which may be formed of paper . As well , the cooling element may comprise a hollow tubular member which may be formed of paper . As regards the length of the hollow tubular member, 10 to 25 mm and preferably 18 to 22 mm are currently preferred . A further tubular member with an inner diameter smaller than the spacing and/or cooling member ( i . e . , a "center hole" segment ) may be positioned between the cooling tubular member and the filter segment such as described in EP3881699A1 .

In an example , the mouthpiece includes in the downstream direction the cooling element , a center hole segment and a filter segment . The center hole segment can be a segment positioned between the spacing and the filter segment . Since it is close to the mouth end, it can insulate the surface from the vapor .

The mouthpiece and the aerosol generation section are preferably individually wrapped by a wrapper and assembled by assembling wrapper, i . e . , tipping paper .

A ventilation zone may be provided in the mouthpiece , preferably through the spacing and/or cooling element . The ventilation zone may be formed by a plurality of perforations provided through the wrapper and the hollow tubular member and/or through the wrapper and the center hole segment .

Whereas the aerosol generating substrate can have any appropriate extension, it will keep the article described herein compact , when the aerosol generating substrate extends from the upstream end towards the downstream end of the article . A preferred total length of the article is also between 50 mm and 70 mm, more preferably between 55 mm and 65 mm, even more preferably 58 mm to 62 mm; wherein a length of the aerosol generating section is preferably about 15 mm to 25 mm and a length of the mouthpiece is preferably about 30 and 45 mm .

A front plug may be added upstream of the tobacco-based aerosol generating substrate . The front plug may for instance act to prevent falling of tobacco substrate from the tobaccobased substrate and/or maintain the tobacco-based substrate compressed . The front plug may be a plain segment or hollow tubular segment made of fibrous material such as cellulose acetate or paper sheet or nonwoven .

Brief description of the drawings

Hereinafter, the invention will be described with reference to non-limiting examples thereof , and with reference to the drawings , in which

Fig . 1 to 7 show various embodiments of the aerosol generating article , and

Fig . 8 shows the ef fect obtained by the invention .

Detailed Description of Preferred Embodiments

As can be taken from Fig . 1 , the aerosol generating article 10 described herein is essentially rod or cylinder shaped, in which approximately a third to hal f of the length corresponds to an aerosol generating section which is heated by a heating zone demarcated by an external heater of the aerosol generating device indicated by 12 . The aerosol generating section comprises a tobacco-based substrate 14 and an additional aerosol generating reservoir 16 . Both are thus located in use in the heating zone 12 . The aerosol generating article further comprises in the downstream direction of the aerosol flow path, a cooling tubular member 22 and a filter 24 . The cooling tubular member 22 may comprise for instance a paper tube or any other at least partially rigid hollow structure enabling to give enough space and surface to the aerosol to cool down . A further tubular member with an inner diameter ( i . e . a "center hole" segment ) smaller than the cooling member may be positioned between the cooling tubular member 22 and the filter such as described in EP3881699A1 . The filter 24 may comprise one or several filter segments such as made of cellulose acetate or paper sheet . The filter may comprise a flavour release filter, e . g . , a breakable capsule filter .

In the embodiment of Fig . 1 , the tobacco-based substrate 14 is essentially divided into halves by the aerosol generating reservoir 16 , in this case having the shape of a disc being located between the two halves . In other words , the aerosol generating reservoir has in this case a longitudinal extension, in other words an extension along the axis of the cylinder, which is signi ficantly smaller, for example , only about 10 to 20% of one hal f of the tobacco-based substrate .

In an example , the article has a length of 40 to 80 mm, preferably 60 mm with a tobacco-based substrate having a length of 11 to 17 mm, preferably 14 mm, an aerosol generating reservoir of 4 to 8 mm, preferably 6 mm and a hollow tubular member comprising a paper tube of 15 to 25 mm, preferably 20 mm .

These dimensions essentially correspond to those shown for the embodiment of Fig . 2 , in which the aerosol generating reservoir 16 is positioned downstream of the tobacco-based substrate 14 . In both cases , both the substrate 14 and the reservoir 16 extend throughout the radial dimensions of the article 10 as a whole , the outside of which is essentially defined by the wrapper .

The described dimensions also apply to the embodiments of Fig . 3 and 4 , in which the embodiment of Fig . 3 has an essentially central hole or longitudinal channel 20 . As a further example , the embodiment o f Fig . 4 has plural , in the case shown four such longitudinal holes or channels 20 . It goes without saying, that the discs of the embodiments o f Fig . 1 , 3 and 4 do not have to be located exactly at the center of the tobacco-based substrate 14 in the longitudinal direction, but can be located further up or downstream, with a downstream position being preferred . Alternatively or in addition to the discs shown in Fig . 1 to 4 , the aerosol generating reservoir can also be formed of multiple discrete elements 18 as shown in Fig . 5 .

As a further alternative , in the embodiment of Fig . 6 , the aerosol generating reservoir 16 is formed as a thin film between the radially inner tobacco-based substrate 14 and the outer wrapper . The film can extend around the entire circumference , but it can also be shorter or longer, so as to overlap . Moreover, the film can have an axial extension corresponding to that of the tobacco-based substrate 14 , but it can also be shorter or longer .

As a further alternative , in the embodiment of figure 7 , the aerosol generating article 10 di f fers from the aerosol generating article 10 of the embodiment of figure 1 by a front plug 26 . The front plug 26 is arranged so that the aerosol generating section is axially between the front plug 26 and the cooling tubular member 22 . In other words , the front plug 26 is provided upstream of the tobacco-based aerosol generating substrate 14 .

The front plug 26 may be plain or hollow . The front plug 26 may be made of fibrous material . In such case , the fibrous material may include at least one of cellulose acetate , paper sheet or nonwoven .

As well as in the embodiment of figure 3 and 4 , the aerosol generating article 10 of the embodiment of figure 7 may include an essentially central hole or longitudinal channel . Also , it may be contemplated that the aerosol generating article 10 of the embodiment of figure 7 includes an aerosol generating reservoir formed of multiple discrete elements or formed as a thin film as in the embodiment of figures 5 and 6 . Fig. 8 essentially summarizes the effect obtained by the invention, which is a quick and extensive vapor generation as compared to current products.

Examples of recipes for the aerosol generating reservoir, i.e., (e-)mousse or foam are:

The e-mousse could comprise flavouring agents such as for example ethyl vanillin, menthol, spearmint oil, berry, fruit, root or plant extract or oil.

The e-mousse could comprise a pH adjusting agent e.g. chosen from one or more of sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, etc., and mixtures thereof.

Homogenized tobacco material in the context of the present disclosure denotes a material formed of agglomerated particulate tobacco (e.g. tobacco powder) , aerosol forming agent, and optionally extrinsic binder (other than tobacco intrinsic binder) .

The homogenized tobacco material may have any one more of the following characteristics:

Tobacco particle size D90: between about 20 - 1000 microns, preferably between 30 and 300 microns. D90 represents the maximum particle diameter below which 90% of the sample volume exists. It is measured using Malvern Mastersizer 3000 laser diffraction instrument using dry dispersion method.

The material is preferably formed into a sheet from a slurry by paper making process or cast sheet or slurry or dough by extrusion/lamination process.

The sheet can be inserted in a gathered form or cut or broken down into strands, shreds, strips, fragments, etc. The sheet can eventually be crimped. o Laminated sheet examples can be taken from: WO2021144676A1 , WO2021144043A1 , W02020058814 o Paper making sheet examples are shown in W02017051034 . o Cast sheet examples are given in: W02016050471A1, WO2016050470A1 , WO2012164009A1

Density (or mass -to-surface area ratio) in dry basis of the homogenized tobacco material: 800 to 1450 mg/cm3, preferably 900-1200 mg/cm3.

Content of aerosol forming agent in the sheet: 8-25 wt.%, preferably 10-18 wt . % in dry basis of the homogenized tobacco material.

The aerosol-forming agent can be: preferably polyhydric alcohol, which may include glycerin, propylene glycol, sorbitol, xylitol and erythritol. These polyhydric alcohols can be used alone or in combination of two or more.

The homogenized tobacco material may contain a binder (e.g. pectin, guar gum, locus bean gums, alginate, starches, CMC, dextran, etc.) . The binder may be needed in particular for cast or extruded sheet when starting from a slurry or dough.

It is possible to blend different homogenized tobacco materials with tobacco of different origins/varieties (e.g. burley, Virginia, oriental, etc.) , and/or different making processes (cast, paper, laminated) . Possibly, also a blend of homogenized tobacco material with tobacco lamina, cellulose fibre, non-woven fibre, etc. can be provided.

The filling density of the tobacco-based aerosol generating substrate in the wrapper, may be at least 250 mg/cm3, preferably at least 300 mg/cm3 or usually 500 mg/cm3 or less, preferably 400 mg/cm3 or less, more preferably 350 cm3 or less .

Claims

1. An aerosol generating article (10) configured for being heated but not burnt comprising an aerosol generating section and a filter section; the aerosol generating section being wrapped by a wrapper and comprising at least a tobacco-based aerosol generating substrate (14) comprising homogenized tobacco material wherein the aerosol generating section further comprises a porous aerosol generating reservoir (16) containing a foam comprising an aerosol forming agent and a foam forming agent.

2. Aerosol generating article (10) according to claim 1, wherein the aerosol generating reservoir (16) is positioned longitudinally and/or radially adjacent to the tobacco-based aerosol generating substrate (14) .

3. Aerosol generating article (10) according to claim 1 or 2, wherein the aerosol reservoir (16) is formed as a disc.

4. Aerosol generating article (10) according to one of claims

1 to 3, wherein the aerosol reservoir (16) comprises at least one longitudinal channel (20) .

5. Aerosol generating article (10) according to one of claims 1 to 4, wherein the aerosol reservoir (16) is positioned downstream of the tobacco-based aerosol generating substrate (14) .

6. Aerosol generating article (10) according to one of claims 1 to 5, wherein the aerosol generating reservoir (16) is formed of multiples discrete elements (18) embedded in the tobacco-based aerosol generating substrate (14) .

7. Aerosol generating article (10) according to claims 1 to 6, wherein the aerosol generating reservoir (16) is a thin film between the tobacco-based aerosol generating substrate (14) and the wrapper.

8. Aerosol generating article (10) according to one of claims 1 to 7, wherein the additional aerosol generating reservoir (16) comprises an aerosol generating liquid.

9. Aerosol generating article (10) according to one of claims 1 to 8, wherein the content of aerosol forming agent in the foam is higher than the content of aerosol forming agent in the tobacco-based aerosol generating substrate (14) .

10. Aerosol generating article (10) according to one of claims 1 to 9, wherein the foam-forming agent is selected from the group consisting of hydrocolloid selected from the group of agar, gellan gum, an emulsifier selected from the group of lecithin, polyglycerol esters of fatty acids, glycerol esters of fatty acids, sorbitan esters of fatty acids, and mixtures thereof.

11. Aerosol generating article (10) according to one of claims 1 to 10, wherein the foam further comprises a foam stabilizing agent.

12. Aerosol generating article (10) according to claim 11, wherein the foam-stabilizing agent is selected from the group consisting of cellulose gum, hydroxyalkylated carbohydrates, derivatives thereof, and mixtures thereof.

13. Aerosol generating article (10) according to claim 11 or 12, wherein the foam stabilizing agent comprises cellulose gum, in particular carboxymethylcellulose (CMC) or derivatives thereof and/or cellulose fibre.

14. Aerosol generating article (10) according to one of claims 11 to 13, wherein the amount of foam-stabilizing agent is comprised between 10 and 30 wt. % of the aerosol generating reservoir, preferably between 12 and 28 wt. % of the aerosol generating reservoir, more preferably between 15 and 25 wt . % of the aerosol generating reservoir.

15. Aerosol generating article (10) according to one of claims 11 to 14, wherein the foam-stabilizing agent comprises at least 10 wt . % of cellulose fibre in the aerosol generating reservoir, preferably about 12 wt % of cellulose fibre in the aerosol generating reservoir, and/or at least 10 wt . % of carboxymethylcellulose in the aerosol generating reservoir, preferably about 11 wt . % of carboxymethylcellulose in the aerosol generating reservoir.

16. Aerosol generating article (10) according to one of claims 1 to 15, wherein the aerosol forming agent is present in an amount of at least 50 wt . % , preferably at least 60 wt . % , most preferred 70-85 wt . % of the total weight in dry basis of the aerosol reservoir.

17. Aerosol generating article (10) according to one of claims 1 to 16, wherein the aerosol forming agent comprises glycol derivatives, such as propylene glycol, or glycerin or glycerol or sebacate esters or a combination thereof and preferably comprises glycerol.

18. Aerosol generating article (10) according to one of claims 1 to 17, wherein the aerosol forming agent comprises at least 30 wt . % glycerin, preferably at least 50 wt . % glycerin, most preferably at least 65 % glycerin and most preferred at least 70 wt . % glycerin of the total weight in dry basis of aerosol forming agent.

19. Aerosol generating article (10) according to one of claims 1 to 18, wherein the homogenized tobacco material takes the form of gathered sheet, shreds, or strips.

20. Aerosol generating article (10) according to one of claims 1 to 19, wherein the homogenized tobacco material is manufactured into sheets or strips from a slurry by paper forming technology or casting, or from a slurry or dough by extrusion and lamination.

21. Aerosol generating article (10) according to one of claims 1 to 20, the tobacco-based aerosol generating substrate (14) further includes tobacco lamina.

22. Aerosol generating article (10) according to claim 21, wherein the tobacco lamina is in the form of shreds.

23. Aerosol generating article (10) according to one of claims 1 to 22, wherein a minor amount of cut tobacco stems or stalks, cellulose fibre or expanded tobacco is present in the tobacco-based aerosol generating substrate (14) .

24. Aerosol generating article (10) according to claim 23, wherein the minor amount of cut tobacco stems or stalks, cellulose fibre or expanded tobacco is 15 wt. % or less of the tobacco-based aerosol generating substrate (14) .

25. Aerosol generating article (10) according to one of claims 1 to 24, wherein the aerosol generating reservoir is formed of a cylindrical disc positioned adjacent the tobaccobased aerosol generating substrate.

26. Aerosol generating article (10) according to one of claims 1 to 25, wherein the ratio of the length of the aerosol generating reservoir to that of the tobacco-based aerosol generating substrate is comprised between 1:1 and 1:5, preferably 1:2 and 1:4.

27. Aerosol generating article (10) according to one of claims 1 to 26, wherein the length of the tobacco-based aerosol generating substrate is between 13 mm and 15 mm, preferably about 14 mm, and/or the length of the aerosol generating reservoir is between 5,5 mm and 6,5 mm, preferably about 6 mm.

28. Aerosol generating article (10) according to one of claims 1 to 27, wherein the amount of foam forming agent is comprised between 1 and 15 wt . % of the aerosol generating reservoir, preferably between 2 and 10 wt. % of the aerosol generating reservoir, more preferably between 3 and 8 wt . % of the aerosol generating reservoir.

29. Aerosol generating article (10) according to one of claims 1 to 28, further comprising a mouthpiece downstream of the aerosol generating substrate.

30. Aerosol generating article (10) according to claim 29, wherein the mouthpiece is contained in the wrapper.

31. Aerosol generating article (10) according to claim 29 or 30, wherein the mouthpiece comprises a filter.

32. Aerosol generating article (10) according to one of claims 29 to 31, wherein a length of the mouthpiece is about 30 and 45 mm.

33. Aerosol generating article (10) according to one of claims 29 to 32, wherein the mouthpiece comprises a spacing and/or cooling element provided between the aerosol generating section and the filter section.

34. Aerosol generating article (10) according to claim 33, wherein the spacing and/or the cooling element comprises a hollow tubular member.

35. Aerosol generating article (10) according to claim 34, wherein the hollow tubular member is formed of paper.

36. Aerosol generating article (10) according to claim 34 or

35, wherein the hollow tubular member has a length between 10 to 25 mm, preferably 18 to 22 mm.

37. Aerosol generating article (10) according to one of claims 34 to 36, wherein the mouthpiece includes a ventilation zone preferably extending through the hollow tubular member.

38. Aerosol generating article (10) according to one of claims 33 to 37, wherein the mouthpiece includes a ventilation zone preferably extending through the spacing and/or cooling element.

39. Aerosol generating article (10) according to one of claims 1 to 38, wherein the wrapper is made from a cigarette paper .

40. Aerosol generating article (10) according to one of claims 1 to 39, wherein the wrapper is designed to avoid scorching of the foam.

41. Aerosol generating article (10) according to one of claims 1 to 40, wherein the total length of the aerosol generating article (10) is between 50 mm and 70 mm, preferably between 55 mm and 65 mm, more preferably 58 mm to 62 mm.

42. Aerosol generating article (10) according to one of claims 1 to 41, wherein a length of the aerosol generating section is about 15 mm to 25 mm.

43. Aerosol generating article (10) according to one of claims 1 to 42, further including a front plug provided upstream of the tobacco-based aerosol generating substrate.

44. Aerosol generating article (10) according to claim 43, wherein the front plug is a plain segment.

45. Aerosol generating article (10) according to claim 43, wherein the front plug is a hollow segment.

46. Aerosol generating article (10) according to one of claims 43 to 45, wherein the front plug is made of fibrous material and wherein, preferably, the fibrous material includes at least one of cellulose acetate or paper sheet or nonwoven