KR20240153318A - Aerosol generating articles - Google Patents

Abstract

An aerosol generating article (10) configured to be heated without burning comprises an aerosol generating portion and a filter portion; the aerosol generating portion comprises at least a tobacco-based aerosol generating substrate (14) wrapped by a wrapper and comprising homogenized tobacco material and/or reconstituted tobacco, the aerosol generating portion further comprising a porous aerosol generating reservoir (16) comprising a foam comprising an aerosol former and a foam forming agent.

Description

Aerosol generating articles

The present invention relates to an aerosol generating article.

Aerosol generating products are gaining popularity as an alternative to traditional smoking products. Consumers expect these products to contain nicotine and/or tobacco and simultaneously produce a visible vapor.

In this context, EP 3 046 431 B1 relates to an aerosol generating system having a nicotine source which may be a liquid tobacco extract. WO 2021/053029 A1 relates to a plurality of aerosol generating substrates, WO 2018/122375 A1 discloses a tobacco mousse. Finally, further aerosol generating articles are known from EP 3 462 935 B1, WO 2020/089067 A1 and WO 2020/089068 A1.

Nonetheless, there is a need for improved aerosol generating articles with respect to the production of visible vapor.

Accordingly, the present invention provides an aerosol generating article which is improved with respect to the generation of visible vapor.

This is achieved by the subject matter of claim 1.

Accordingly, the novel aerosol-generating article is configured to be heated without combustion and comprises an aerosol-generating portion and a filter portion. At least the aerosol-generating portion comprises at least a tobacco-based aerosol-generating substrate, which is wrapped by a wrapper and comprises homogenized tobacco material, such as reconstituted tobacco, and optionally tobacco lamina, for example, up to 30 wt. % of the weight of the tobacco-based aerosol-generating substrate. The homogenized tobacco material may take the form of a gathered sheet, piece, or strip. The homogenized tobacco material may be prepared into a sheet or strip from a slurry by paper forming techniques or casting, or from a slurry or dough by extrusion and lamination. The tobacco lamina may also be in the form of a piece. Additionally, a small amount (e.g., up to 15 wt. %) of cut tobacco stems or petioles, cellulose fibers, or expanded tobacco may be present. The aerosol-generating portion further comprises a porous aerosol-generating reservoir comprising a foam comprising an aerosol former and a foam former and optionally a foam stabilizer.

By means of the tobacco-based aerosol generating substrate, tobacco flavour and nicotine can be delivered, and by means of the additional aerosol generating reservoir, an increased amount of visible vapour can be generated. In this context, the foam contained in the aerosol generating reservoir can also be referred to as mousse or e-mousse, since it carries an e-liquid similar to the liquid in an electronic cigarette. As an aspect, the tobacco substrate is formed of tobacco which is essentially solid, preferably in the form of a high tobacco content collected sheet, piece, strip or the like, preferably in the form of an agglomerated powder, and at least preferably is not a tobacco mousse or capillary tobacco substrate.

The foam of the aerosol generating reservoir keeps the aerosol former of the moose in a non-free liquid state and/or prevents it from leaking out. That is, there is no aerosol precursor in a free liquid state and preferably no solid matrix or carrier in the aerosol generating reservoir. Thus, the desired effort to generate a large amount of visible vapor can be achieved without the risk of unwanted leakage of any kind of liquid from the reservoir. At the same time, by not requiring any solid matrix or carrier (e.g., ceramic or porous plastic), the structure is relatively simple, easily insertable (i.e., more deformable or formable) into a paper packaging, and can be maintained as biodegradable.

The effort achieved by the present invention can also be referred to as a visible vapor booster which will result in a satisfactory vaping experience for the user. As already indicated, this is essentially achieved by a reservoir comprising an aerosol former or a humectant. In particular, the aerosol generating liquid may advantageously comprise at least one component having a boiling point greater than 160° C., preferably greater than 175° C., and 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 for manufacturability reasons. Manufacturability problems relate to the fact that when the amount of aerosol former exceeds a certain value, for example 25 to 30 wt. % of the total weight of the substrate, the product becomes too sticky, difficult to handle, and when packaged, stains the packaging. Therefore, by providing an aerosol generating reservoir in addition to and separate from the tobacco-based substrate, an extra amount of visible vapor can essentially be generated. At the same time, heating of the aerosol generating reservoir can be ensured by preventing any kind of thermal barrier around or adjacent to it.

Preferred embodiments are set forth in the additional claims.

In general, the aerosol generating reservoir may be positioned anywhere where the desired amount of vapor is generated when heated. In particular, a location longitudinally and/or radially adjacent to the tobacco-based substrate would be advantageous in ensuring that the adjacent aerosol generating substrate and reservoir are still covered while being heated by a heater having relatively small dimensions.

In a similar manner, the aerosol generating reservoir may have any suitable shape and in particular may be formed as a disc extending over the entire radial dimension of the packaged internal volume of the aerosol generating article, which is generally a cylindrical volume. However, the disc may also be oriented in other ways, in particular obliquely to the radial direction. Furthermore, the foam may also be present in the shape of a rod, which may not necessarily cover the entire radial dimension of the article and may essentially extend longitudinally or obliquely. In a preferred mode, the aerosol generating reservoir is formed as a cylindrical disc, which is arranged adjacent to the tobacco-based aerosol generating substrate, and the ratio of the length of the aerosol generating reservoir to the length of the tobacco-based aerosol generating substrate is comprised between 1:1 and 1:5, preferably between 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 may also include one or more longitudinal channels that facilitate the flow of aerosol through the reservoir.

Currently, it is expected that the compatibility of the tobacco-based substrate and the additional aerosol generating reservoir will be particularly good if the reservoir is placed downstream of the substrate. In fact, the aerosol from the reservoir can be more easily delivered without being impeded by the mass of the tobacco-based substrate.

Nonetheless, both the discs shown above as well as a number of separate elements, such as beads or pellets, constituting the aerosol reservoir may advantageously be embedded in a tobacco-based substrate.

In a preferred embodiment of the aerosol generating reservoir regularly adjacent to the tobacco-based substrate, the reservoir may be essentially a thin film disposed between the substrate and the outer wrapper.

A well-formed aerosol former may nonetheless be comprised of an aerosol-generating liquid which is incorporated in a manner that prevents leakage as indicated above.

The basic concept of the present invention to increase the amount of visible vapor is reflected in the preferred measure, in particular, that the content of aerosol former in the foam of the reservoir is higher than the content of aerosol former in the tobacco-based substrate.

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

- A hydrocolloid selected from the group consisting 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

- A mixture thereof. Preferably, the foam forming agent comprises or consists of gellan gum.

The amount of foam forming agent is preferably from 1 to 15 wt %, more preferably from 2 to 10 wt %, and most preferably from 3 to 8 wt %, on dry basis, of the aerosol generating reservoir.

Also preferably, the foam stabilizer is selected from the group consisting of cellulose gum, hydroxyalkylated carbohydrates, derivatives thereof, and mixtures thereof, and/or the foam stabilizer comprises cellulose gum, in particular carboxymethylcellulose (CMC) or derivatives thereof, and/or cellulose fibers.

The amount of the foam stabilizer is preferably from 8 to 30 wt %, on a dry basis, of the aerosol generating reservoir, preferably from 10 to 28 wt %, on a dry basis, and most preferably from 15 to 25 wt %, on a dry basis, of the aerosol generating reservoir. In one example, the foam stabilizer comprises from 8 to 12 wt %, on a dry basis, of cellulose fibers and from 8 to 12 wt %, on a dry basis, of carboxymethylcellulose in the aerosol generating reservoir. In another example, the foam stabilizer comprises from 15 to 18 wt %, on a dry basis, of carboxymethylcellulose in the aerosol generating reservoir.

For all the materials mentioned above, excellent results will be obtained with regard to forming and stabilizing foams.

The foam comprises an open porous structure, and in particular the structure is formed essentially by a foam former and a foam stabilizer.

This also applies with respect to the formation of a sufficient amount of visible vapor when the aerosol former is present in an amount of at least 50 wt.-%, preferably at least 60 wt.-%, and most preferably from 70 to 85 wt.-% of the total weight of the aerosol reservoir on a dry basis.

Preferably, the aerosol former comprises a glycol derivative, such as propylene glycol, or glycerin or glycerol or a sebacate ester or a combination thereof, preferably comprises glycerol and/or the aerosol former comprises at least 30 wt.-% glycerin, preferably at least 50 wt.-% glycerin, most preferably about 63 wt.-% glycerin, based on the total weight of the aerosol former on dry basis. With the amounts of such substances described, particularly good formation of a visible vapor will be obtained.

The aerosol-generating article described herein comprises the above-described portion wrapped in a packaging material. The article may further comprise a mouthpiece downstream of the tobacco-based aerosol-generating substrate, which may be included in the packaging material. Additionally, the mouthpiece may comprise a filter and a spacing and/or cooling element provided between the aerosol-generating portion and the filter. The packaging material may be formed of, for example, cigarette paper and may or may not be metallized. In either case, the packaging material may be designed to prevent scorching of the foam.

In relation to the filter provided in the mouthpiece, this may be configured to provide a relatively low, and in any case acceptable, pressure drop, so that the flavour intensity and nicotine yield are optimally maintained. Additionally, the presence of the baffle and/or cooling element will first of all cool the generated aerosol, thus preventing an aerosol having an uncomfortably high temperature from entering the user's mouth. Furthermore, due to the baffle element, the article according to the invention may be sized to fit a well-established aerosol generating device that can be used with the article. Due to the fact that the article described herein can be used with existing aerosol generating devices, the user has the advantage that a single device is sufficient and only one device needs to be maintained.

The separation member may comprise a hollow tubular member which may be formed of paper. Furthermore, the cooling element may comprise a hollow tubular member which may be formed of paper. With respect to the length of the hollow tubular member, it is presently preferred to be 10 to 25 mm, preferably 18 to 22 mm. An additional tubular member having an inner diameter smaller than the separation and/or cooling member (i.e. the "centre hole" portion) as described in EP3881699A1 may be arranged between the cooling tubular member and the filter portion.

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

The mouthpiece and the aerosol generating portion are preferably wrapped individually by a wrapping paper and assembled by assembling the wrapping paper, i.e. tipping paper.

The ventilation zone may preferably be provided in the mouthpiece via a separation and/or cooling element. The ventilation zone may be formed by a plurality of perforations provided through the packaging and the hollow tubular member and/or through the packaging and the central hole portion.

While the aerosol generating substrate may have any suitable extension, the article described herein will remain compact when the aerosol generating substrate extends from the upstream end of the article toward the downstream end. The overall length of the preferred article is also from 50 mm to 70 mm, more preferably from 55 mm to 65 mm, and even more preferably from 58 mm to 62 mm; the length of the aerosol generating portion is preferably from about 15 mm to 25 mm and the length of the mouthpiece is preferably from about 30 to 45 mm.

A front plug may be added upstream of the tobacco-based aerosol generating substrate. The front plug may, for example, serve to prevent the tobacco substrate from falling out of the tobacco-based substrate and/or to maintain the tobacco-based substrate in a compressed state. The front plug may be a flat portion or a hollow tubular portion made of a fibrous material such as cellulose acetate or a paper sheet or a non-woven fabric.

Hereinafter, the present invention will be described with reference to non-limiting examples of the present invention and with reference to the drawings:
Figures 1 to 7 illustrate various embodiments of aerosol generating articles.
Figure 8 shows the effect obtained by the present invention.

As can be seen in FIG. 1, the aerosol generating article (10) described herein is essentially rod- or cylindrical in shape, with approximately 1/3 to 1/2 of its length corresponding to an aerosol generating portion that is heated by a heating zone defined by an external heater of the aerosol generating device, indicated at 12. The aerosol generating portion comprises a tobacco-based substrate (14) and an additional aerosol generating reservoir (16). Both are thus positioned in the heating zone (12) when in use. The aerosol generating article further comprises a cooling tubular member (22) and a filter (24) downstream of the aerosol flow path. The cooling tubular member (22) may comprise, for example, a paper tube or any other at least partially rigid hollow structure that provides sufficient space and surface area for the aerosol to be cooled. An additional tubular element having a smaller inner diameter (i.e. the "centre hole" portion) than the cooling element may be arranged between the cooling tubular element (22) and the filter as described in EP3881699A1. The filter (24) may comprise one or several filter portions made of, for example, cellulose acetate or paper sheets. The filter may comprise a scent-releasing filter, for example a frangible capsule filter.

In the embodiment of Fig. 1, the tobacco-based substrate (14) is essentially divided in half by an aerosol generating reservoir (16), in this case having the shape of a disc located between the two halves. That is, the aerosol generating reservoir in this case has a longitudinal extension, i.e. an extension along the axis of the cylinder which is considerably smaller, for example only about 10 to 20% of one half of the tobacco-based substrate.

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

These dimensions essentially correspond to the dimensions depicted for the embodiment of FIG. 2, where 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 generally over the entire radial dimension of the article (10), the exterior of which is essentially defined by the packaging.

The described dimensions also apply to the embodiments of FIGS. 3 and 4, which essentially have a central hole or longitudinal channel (20). As a further example, the embodiment of FIG. 4 has a plurality, in the illustrated case four, of such longitudinal holes or channels (20). It goes without saying that the disc of the embodiments of FIGS. 1 , 3 and 4 need not be positioned exactly in the longitudinal center of the tobacco-based substrate (14), but may be positioned further upstream or downstream, with a downstream position being preferred. Alternatively or additionally to the discs illustrated in FIGS. 1 to 4, the aerosol generating reservoir may also be formed of a plurality of separate elements (18), as illustrated in FIG. 5.

As a further alternative, in the embodiment of FIG. 6, the aerosol generating reservoir (16) is formed as a membrane radially between the inner tobacco-based substrate (14) and the outer wrapper. While the membrane may extend around the entire circumference, the membrane may also be shorter or longer to overlap. Furthermore, while the membrane may have an axial extension corresponding to the extension of the tobacco-based substrate (14), the membrane may also be shorter or longer.

As a further alternative, in the embodiment of FIG. 7, the aerosol generating article (10) differs from the aerosol generating article (10) of the embodiment of FIG. 1 by the front plug (26). The front plug (26) is positioned such that the aerosol generating portion is axially located between the front plug (26) and the cooling tubular member (22). That is, the front plug (26) is provided upstream of the tobacco-based aerosol generating substrate (14).

The front plug (26) may be flat or hollow. The front plug (26) may be made of a fibrous material. In this case, the fibrous material may include at least one of cellulose acetate, paper sheets or non-woven fabric.

In addition to the embodiments of FIGS. 3 and 4, the aerosol generating article (10) of the embodiment of FIG. 7 may essentially comprise a central hole or longitudinal channel. It is also contemplated that the aerosol generating article (10) of the embodiment of FIG. 7 may comprise an aerosol generating reservoir formed of a plurality of separate elements or formed as a thin film as in the embodiments of FIGS. 5 and 6.

Figure 8 summarizes the effects achieved by the present invention, which are essentially rapid and extensive vapor generation compared to current products.

Examples of recipes for aerosol generating reservoirs, i.e. (e-)mousses or foams, are as follows:

E-mousses may contain flavouring agents such as ethyl vanillin, menthol, spearmint oil, berry, fruit, root or plant extracts or oils, for example.

The e-mousse may comprise a pH adjusting agent selected from, for example, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, and mixtures thereof.

In the context of the present disclosure, homogenized tobacco material means a material formed of agglomerated particulate tobacco (e.g., tobacco powder), an aerosol former, and optionally an external binder (other than a binder inherent in the tobacco).

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

- Tobacco particle size D90: about 20 to 1000 μm, preferably 30 to 300 μm. D90 represents the maximum particle diameter present in less than 90% of the sample volume. It is measured using a Malvern Mastersizer 3000 laser diffraction instrument using a dry dispersion method.

- The material is preferably formed into a sheet from a slurry by a papermaking process or formed into a cast sheet or a slurry or dough by an extrusion/lamination process.

- The sheets may be inserted in a pleated form or may be cut or shredded into strands, pieces, strips, fragments, etc. The sheets may finally be crimped.

o Examples of laminated sheets can be obtained from WO2021144676A1, WO2021144043A1, WO2020058814.

o An example of a paper manufacturing sheet is shown in WO2017051034.

o Examples of cast sheets are provided in WO2016050471A1, WO2016050470A1, WO2012164009A1.

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

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

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

- The homogenized tobacco material may include a binder (e.g., pectin, guar gum, locust bean gum, alginate, starch, CMC, dextran, etc.). A binder may be required for cast or extruded sheets, particularly when starting from a slurry or dough.

- It is possible to blend different homogenised tobacco materials with tobacco of different origins/varieties (e.g. Burley, Virginia, Oriental, etc.) and/or different manufacturing processes (cast, paper, laminated).

- Possibly, also a mixture of homogenized tobacco material and tobacco sheet, cellulose fibers, non-woven fibers, etc. may be provided.

The packing density of the tobacco-based aerosol generating substrate within the packaging may be at least 250 mg/cm3, preferably at least 300 mg/cm3 or generally no more than 500 mg/cm3, preferably no more than 400 mg/cm3, more preferably no more than 350 mg/cm3.

Claims (46)

An aerosol generating article (10) comprising an aerosol generating portion and a filter portion, the aerosol generating portion being configured to be heated without combustion, wherein the aerosol generating portion is wrapped by a wrapper and comprises at least a tobacco-based aerosol generating substrate (14) comprising homogenized tobacco material, the aerosol generating portion further comprising a porous aerosol generating reservoir (16) comprising a foam comprising an aerosol former and a foam forming agent. In the first paragraph, the aerosol generating reservoir (16) is arranged longitudinally and/or radially adjacent to the tobacco-based aerosol generating substrate (14), an aerosol generating article (10). An aerosol generating article (10) in claim 1 or 2, wherein the aerosol storage (16) is formed as a disk. An aerosol generating article (10) according to any one of claims 1 to 3, wherein the aerosol reservoir (16) comprises at least one longitudinal channel (20). An aerosol generating article (10) according to any one of claims 1 to 4, wherein the aerosol reservoir (16) is positioned downstream of the tobacco-based aerosol generating substrate (14). An aerosol generating article (10) according to any one of claims 1 to 5, wherein the aerosol generating reservoir (16) is formed of a plurality of discrete elements (18) embedded in the tobacco-based aerosol generating substrate (14). An aerosol generating article (10) according to any one of claims 1 to 6, wherein the aerosol generating reservoir (16) is a thin film between the tobacco-based aerosol generating substrate (14) and the packaging paper. An aerosol generating article (10) according to any one of claims 1 to 7, wherein the additional aerosol generating reservoir (16) comprises an aerosol generating liquid. An aerosol generating article (10) according to any one of claims 1 to 8, wherein the content of the aerosol former in the foam is higher than the content of the aerosol former in the tobacco-based aerosol generating substrate (14). An aerosol-generating article (10) according to any one of claims 1 to 9, wherein the foam-forming agent is selected from the group consisting of a hydrocolloid selected from the group of agar, gellan gum, lecithin, an emulsifier selected from the group of polyglycerol esters of fatty acids, glycerol esters of fatty acids, sorbitan esters of fatty acids, and mixtures thereof. An aerosol generating article (10) according to any one of claims 1 to 10, wherein the foam further comprises a foam stabilizer. An aerosol generating article (10) in claim 11, wherein the foam stabilizer is selected from the group consisting of cellulose gum, hydroxyalkylated carbohydrates, derivatives thereof, and mixtures thereof. An aerosol generating article (10) according to claim 11 or 12, wherein the foam stabilizer comprises cellulose gum, particularly carboxymethylcellulose (CMC) or derivatives thereof and/or cellulose fibers. An aerosol generating article (10) according to any one of claims 11 to 13, wherein the amount of the foam stabilizer 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. An aerosol-generating article (10) according to any one of claims 11 to 14, wherein the foam stabilizer comprises at least 10 wt. % of cellulose fibers in the aerosol-generating reservoir, preferably about 12 wt. % of cellulose fibers 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. An aerosol-generating article (10) according to any one of claims 1 to 15, wherein the aerosol former is present in an amount of at least 50 wt.-%, preferably at least 60 wt.-%, more preferably 70 to 85 wt.-% of the total weight of the aerosol-generating reservoir on a dry basis. An aerosol-generating article (10) according to any one of claims 1 to 16, wherein the aerosol former comprises a glycol derivative, such as propylene glycol, or glycerin or glycerol or sebacate ester or a combination thereof, and preferably comprises glycerol. An aerosol-generating article (10) according to any one of claims 1 to 17, wherein the aerosol former comprises at least 30 wt. % glycerin, preferably at least 50 wt. % glycerin, most preferably at least 65 wt. % glycerin and most preferably at least 70 wt. % glycerin, of the total weight of the aerosol former on a dry basis. An aerosol generating article (10) according to any one of claims 1 to 18, wherein the homogenized tobacco material takes the form of a collected sheet, shred or strip. An aerosol generating article (10) according to any one of claims 1 to 19, wherein the homogenized tobacco material is manufactured into a sheet or strip from a slurry by paper forming techniques or casting, or from a slurry or dough by extrusion and lamination. An aerosol generating article (10) according to any one of claims 1 to 20, wherein the tobacco-based aerosol generating substrate (14) further comprises a tobacco lamina. In claim 21, the tobacco sheet is in the form of a piece, an aerosol generating article (10). An aerosol generating article (10) according to any one of claims 1 to 22, wherein a small amount of cut tobacco stem or stalk, cellulose fibers or expanded tobacco is present in the tobacco-based aerosol generating substrate (14). An aerosol generating article (10) in claim 23, wherein the small amount of cut tobacco stems or petioles, cellulose fibers or expanded tobacco is 15 wt% or less of the tobacco-based aerosol generating substrate (14). An aerosol generating article (10) according to any one of claims 1 to 24, wherein the aerosol generating reservoir is formed as a cylindrical disc positioned adjacent to the tobacco-based aerosol generating substrate. An aerosol generating article (10) according to any one of claims 1 to 25, wherein the ratio of the length of the aerosol generating reservoir to the length of the tobacco-based aerosol generating substrate is comprised between 1:1 and 1:5, preferably between 1:2 and 1:4. An aerosol generating article (10) according to any one of claims 1 to 26, wherein the length of the tobacco-based aerosol generating substrate is from 13 mm to 15 mm, preferably about 14 mm, and/or the length of the aerosol generating reservoir is from 5.5 mm to 6.5 mm, preferably about 6 mm. An aerosol generating article (10) according to any one of claims 1 to 27, wherein the amount of the 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. An aerosol generating article (10) further comprising a mouthpiece downstream of the aerosol generating substrate according to any one of claims 1 to 28. In claim 29, the mouthpiece is an aerosol generating article (10) accommodated in the packaging. An aerosol generating article (10) according to claim 29 or 30, wherein the mouthpiece comprises a filter. An aerosol generating article (10) according to any one of claims 29 to 31, wherein the length of the mouthpiece is about 30 to 45 mm. An aerosol generating article (10) according to any one of claims 29 to 32, wherein the mouthpiece comprises a separation and/or cooling element provided between the aerosol generating portion and the filter portion. An aerosol generating article (10) in claim 33, wherein the separation and/or cooling element comprises a hollow tubular member. In claim 34, the hollow tubular member is formed of paper, an aerosol generating article (10). An aerosol generating article (10) according to claim 34 or 35, wherein the hollow tubular member has a length of 10 to 25 mm, preferably 18 to 22 mm. An aerosol generating article (10) according to any one of claims 34 to 36, wherein the mouthpiece preferably comprises a venting region extending through the hollow tubular member. An aerosol generating article (10) according to any one of claims 33 to 37, wherein the mouthpiece preferably comprises a venting zone extending through the separation and/or cooling element. An aerosol generating article (10) according to any one of claims 1 to 38, wherein the packaging is made of cigarette paper. An aerosol generating article (10) according to any one of claims 1 to 39, wherein the packaging is designed to prevent scorching of the foam. An aerosol generating article (10) according to any one of claims 1 to 40, wherein the total length of the aerosol generating article (10) is 50 mm to 70 mm, preferably 55 mm to 65 mm, more preferably 58 mm to 62 mm. An aerosol generating article (10) according to any one of claims 1 to 41, wherein the length of the aerosol generating portion is about 15 mm to 25 mm. An aerosol generating article (10) further comprising a forward plug provided upstream of the tobacco-based aerosol generating substrate according to any one of claims 1 to 42. In claim 43, the front plug is a flat portion, an aerosol generating article (10). In claim 43, the front plug is a hollow part, an aerosol generating article (10). An aerosol generating article (10) according to any one of claims 43 to 45, wherein the front plug is made of a fibrous material, preferably, the fibrous material comprises at least one of cellulose acetate or a paper sheet or a non-woven fabric.