Aerosol products

Abstract

An aerosol production article (10) for a non-combustion aerosol generating device includes an air inlet end forming an upstream end of the article (10), a mouth end forming a downstream end, and an aerosol-generating substrate disposed between the upstream and downstream ends, the substrate including a first aerosol-generating portion (14) and at least one second aerosol-generating portion (16) disposed closer to the upstream end than the first aerosol-generating portion (14), whereby an air flow is configured to pass through the second aerosol-generating portion (16) before passing through the first aerosol-generating portion (14), the first aerosol-generating portion (14) comprising a tobacco material, and the second aerosol-generating portion (16) comprising a foam, the foam comprising a foam-forming agent and an aerosol-forming agent in a non-free liquid state in the foam, the foam being configured to generate an aerosol upon heating, and disposed closer to the upstream end than any aerosol-generating portion (14) comprising the tobacco material.

Description

[Technical field]

[0001] The present invention relates to an aerosol product. [Background technology]

[0002] Aerosol producing products have become increasingly popular as alternatives to traditional smoking articles, which are expected by consumers to contain nicotine and / or tobacco while at the same time producing visible vapor.

[0003] In this regard, US Patent No. 11083215B2 relates to a heat-not-burn tobacco product in which a first heating section distal to the mouth end contains a liquid aerosol precursor present as a free liquid in an unconstrained form. A similar device can be derived from EP 3818866A1. Summary of the Invention [Problem to be solved by the invention]

[0004] Nevertheless, there remains a need for improved aerosol products with regard to ease of handling. [Means for solving the problem]

[0005] The present invention therefore provides an aerosol product that is improved in terms of ease of handling.

[0006] This is achieved by the subject matter of claim 1.

[0007] Thus, the novel aerosol production article is configured to be heated but not combusted and includes an air inlet end forming the upstream end of the article, a mouth end forming the downstream end, and an aerosol-generating substrate disposed between the upstream and downstream ends.

[0008] the substrate includes a first aerosol-generating portion and at least one second aerosol-generating portion disposed closer to an upstream end than the first aerosol-generating portion, whereby an airflow is configured to pass through the second aerosol-generating portion before passing through the first aerosol-generating portion; The first aerosol-generating portion comprises a tobacco material, and the second aerosol-generating portion comprises a foam comprising an aerosol-forming agent in a non-free liquid state in the foam configured to generate an aerosol upon heating, and is positioned closer to the upstream end than either aerosol-generating portion comprising the tobacco material.

[0009] The aerosol-generating portion containing the tobacco material allows the tobacco taste and nicotine to be delivered, and the second aerosol-generating portion allows the tobacco material to exude. In this regard, the foam contained within the aerosol-generating reservoir may be referred to as a mousse or e-mousse, since it carries an e-liquid similar to the liquid in an electronic cigarette. As an additional aspect, the tobacco substrate is preferably substantially solid and formed as a high tobacco content pleated sheet, flakes, strips, granules, combinations thereof, and the like, and preferably the tobacco is in the form of an agglomerated powder, and is preferably at least not a tobacco mousse or capillary tobacco substrate.

[0010] The foam in the second aerosol-generating portion keeps the aerosol-forming agent in a non-free liquid state in the mousse and / or prevents the aerosol-forming agent from escaping. In other words, 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 effect of producing visible vapor, and in particular producing more visible vapor than conventional products, and impregnating the tobacco, can be obtained without the risk of any kind of liquid undesirably escaping from this reservoir. At the same time, by not requiring any solid matrix or carrier (such as ceramic or porous plastic), the structure remains relatively simple, can be easily inserted into a paper wrapper (i.e., is more easily deformed or molded), and can be biodegradable. The foam is formed from a plurality of gas bubbles that do not contain an aerosol-forming agent.

[0011] Preferably, there is at least no thermal barrier between the second aerosol-generating portion comprising the foam and the first aerosol-generating portion comprising the solid tobacco material, and the first and second aerosol-generating portions are preferably adjacent, closely spaced or in contact.

[0012] The present invention essentially provides an aerosol product, which advantageously includes an aerosol-generating part substantially corresponding to a conventionally used e-liquid in the form of a foam, and is a single article, which is entirely disposable, includes both tobacco and foam, generates an aerosol upstream of the tobacco, and then impregnates the tobacco. This avoids the conventional need for the user to refill two separate parts, i.e. a cartridge containing a conventional e-liquid and a tobacco part. Furthermore, according to the present invention, leakage of e-liquid can advantageously be avoided by the foam. Furthermore, different refill schedules for the e-liquid capsule on the one hand and the tobacco capsule on the other hand can be avoided. Rather, the aerosol product described herein integrates the two necessary aerosol-generating parts, and can consequently be used in a similar manner to the so-called known heat sticks, which contain tobacco and are heated to generate an aerosol containing tobacco flavor. In other words, the article described herein provides a single steam inhalation session close to that of a conventional tobacco heat stick, while still providing a predominant taste of steam-extracted tobacco and low total particulate matter (TPM) emissions. In particular, the article described herein can be advantageously used with an existing aerosol generating device into which the article is inserted. Thus, only a single device needs to be maintained.

[0013] Additionally, the nicotine content of the article is fixed, allowing the user to monitor their nicotine consumption. Additionally, the article can be easily made from materials that can withstand heating temperatures without deformation, and any materials used within the article can be compostable.

[0014] The second aerosol-generating section includes a foam-forming agent to further provide a porous texture to the section.

[0015] The second aerosol-generating portion optionally further comprises a foam stabiliser and / or at least one flavourant to provide a stable foam and / or to provide additional flavour to the user.

[0016] The foam former is preferably selected from the group consisting of: - a hydrocolloid selected from the group consisting of agar, gellan gum, An emulsifier selected from the group consisting of lecithin, polyglycerol fatty acid esters, glycerol fatty acid esters, and sorbitan fatty acid esters; and - A mixture of them. Preferably, the foam-forming agent comprises or consists of gellan gum.

[0017] It is also preferred that the foam stabilizer is selected from the group consisting of cellulose gums, hydroxyalkylated carbohydrates, derivatives thereof and mixtures thereof, and / or that the foam stabilizer comprises cellulose gums, in particular carboxymethylcellulose (CMC) or derivatives thereof and / or cellulose fibers. With all of the above-mentioned substances, excellent results are obtained in terms of foam formation and stabilization. The foam comprises an open-pore porous structure, in particular this structure is essentially formed from the foam former and the foam stabilizer.

[0018] This is also true for forming a sufficient amount of visible vapor when the aerosol forming agent is present in an amount of at least 40% by weight, preferably at least 50% by weight, of the total weight of the second aerosol-generating portion on a dry basis.

[0019] 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 glycerol, and / or the aerosol former comprises at least 30% by weight glycerin, preferably at least 50% by weight glycerin, based on the total weight of the aerosol former on a dry basis. The use of these substances in the amounts mentioned above results in a particularly good formation of visible vapour.

[0020] With regard to the preferred composition of the second aerosol-generating part (on a dry basis), the aerosol forming agent comprises 30-80% by weight, preferably 60-75% by weight, of the total weight of this part.

[0021] The foam former may comprise 3 to 10% by weight of the total weight of this part.

[0022] The foam stabiliser may comprise 10% to 30% by weight of the total weight of the part, and the flavouring material comprises 0% to 10% by weight of the total weight of the second aerosol generating part. In one example, the foam stabiliser comprises 6 to 14% by weight of cellulose fibres and 8 to 14% by weight of carboxymethylcellulose in the second aerosol generating part. In another example, the foam stabiliser comprises about 15 to 21% by weight of carboxymethylcellulose in the second aerosol generating part.

[0023] With regard to the tobacco contained within the first aerosol-generating portion, it is presently preferred that this be provided as tobacco powder and / or tobacco cut filler.

[0024] Alternatively or additionally, the first aerosol-generating portion may comprise reconstituted tobacco substrate and / or tobacco flakes.

[0025] With regard to a preferred specific composition of the first aerosol-generating portion, the tobacco material may comprise a reconstituted tobacco base (i.e. a processed tobacco mixture) comprising 50-80% by weight tobacco material, 10-25% by weight aerosol-forming agent, up to 15% by weight cellulose fibres and up to 10% by weight of a binder such as guar gum.

[0026] The tobacco material can be any one or combination of tobacco flakes, tobacco leaves, tobacco stems, expanded tobacco, and tobacco particles.

[0027] The reconstituted tobacco substrate may have any one or more of the following characteristics: - Tobacco particle size D90: about 20-1000 microns, preferably 30-300 microns. D90 represents the maximum particle diameter below which 90% of the sample volume lies. It is measured using a Malvern Mastersizer3000 laser diffraction instrument using the dry dispersion method. - The material is preferably formed into sheets from a slurry by a papermaking process (no binder required) or into cast sheets, or a slurry, or a dough by an extrusion / lamination process (requires a binder). The sheet may be inserted in pleated form or cut or subdivided into strands, pieces, strips, fragments, etc. The sheet may finally be crimped. Examples of laminated sheets can be obtained from: WO 2021144043A1, WO 2020058814. o Examples of papermaking sheets are shown in WO2017051034. Examples of cast sheets are given in: WO 2016050471 A1, WO 2016050470 A1, WO 2012164009 A1.

[0028] As mentioned above, the tobacco material is preferably formed as pleated sheets, flakes, strips, granules and combinations thereof, all of which are readily processable in connection with the present invention.

[0029] The article described herein is advantageously wrapped with an outer wrapper to provide an easy-to-handle article. At the same time, due to the use of foam, not liquid, regular cigarette paper is sufficient, and there is no need to use, for example, a liquid barrier film. Thus, the wrapper can be made of, for example, paper, metallized (e.g., aluminum-coated), and designed to avoid the foam from burning.

[0030] To further improve the vapor inhalation experience of the user, the article preferably further comprises a filter, which may be a low-filtration filter, and a spacing / cooling section between the filter and the aerosol-generating section. The low-filtration filter optimizes the delivery of vapor and flavors, and the same applies to the effect of the spacing / cooling section. Furthermore, the spacing / cooling section advantageously homogenizes and / or cools the aerosol.

[0031] In an alternative embodiment, the article further comprises a filter adjacent the first aerosol-generating portion.

[0032] If at least one aerosol-generating portion comprises at least one, and preferably a plurality of, hollow air flow tubes extending in the air flow direction, i.e. substantially from the second aerosol-generating portion to the first aerosol-generating portion, this allows the heat to extract more flavour and nicotine.

[0033] On the other hand, if one or more hollow air flow tubes are provided to extend only within the second aerosol-generating portion, this will maximize the generation of aerosol from the foam, which then passes through the tobacco.

[0034] The aerosol-production article described herein comprises the above-mentioned section wrapped in a wrapper. The article may further comprise a mouthpiece downstream of the tobacco-based aerosol-generating substrate, which may also be included in the wrapper. Furthermore, the mouthpiece may comprise a filter and a spacing and / or cooling element provided between the aerosol-generating section and the filter. The wrapper may be made, for example, from cigarette paper and may or may not be metallized (e.g., with an aluminum layer). In either case, the wrapper may be designed to avoid scorching of the foam.

[0035] As regards the filter, this can be adapted so that in any case the pressure drop is relatively low and acceptable, so that the flavor intensity and nicotine yield remain optimal. Furthermore, the presence of the spacing and / or cooling element ensures that the generated aerosol is first cooled, thus preventing an uncomfortably hot aerosol from entering the user's mouth. Furthermore, the spacing element allows the article according to the invention to be provided in a size that is adapted to well-established aerosol generating devices in which it may be used. Due to the fact that the article described herein can be used with existing aerosol generating devices, there is the advantage that a single device is sufficient for the user and only one device needs to be maintained.

[0036] The separation may include a hollow tubular member, which may be made of paper. Similarly, the cooling element may include a hollow tubular member, which may be made of paper. Concerning the length of the hollow tubular member, a length of 10 to 25 mm and preferably 18 to 22 mm is currently preferred. An additional tubular member having a smaller inner diameter than the cooling member, such as that described in EP 3881699 A1, may be placed between the cooling tubular member 22 and the filter section.

[0037] The mouthpiece and aerosol-generating section are preferably wrapped individually in a wrapper (eg plug wrap) and assembled with an assembly wrapper, ie tipping paper.

[0038] A ventilation zone may preferably be provided in the mouthpiece through spacing and / or cooling elements or additional tubular members. The ventilation zone may be formed by a number of perforations provided through the wrapper and the hollow tubular member or additional tubular member.

[0039] The aerosol-generating substrate may have any suitable extent, but the articles described herein remain compact when the aerosol-generating substrate extends from the upstream end towards the downstream end of the article. The preferred overall length of the article is between 50mm and 70mm, more preferably between 55mm and 65mm, and even more preferably between 58mm and 62mm, the length of the aerosol-generating section is preferably between about 15mm and 25mm, and the length of the mouthpiece is preferably between about 30mm and 45mm.

[0040] The present invention also relates to a system, the system comprising: - an aerosol production article for a non-combustion aerosol generating device, the article comprising: an air inlet end forming an upstream end of the article; a mouth end forming a downstream end; and an aerosol-generating substrate disposed between the upstream end and the downstream end; an aerosol product article, the substrate comprising a first aerosol-generating section and at least one second aerosol-generating section disposed closer to the upstream end than the first aerosol-generating section, whereby an airflow is configured to pass through the second aerosol-generating section before passing through the first aerosol-generating section, the first aerosol-generating section comprising a tobacco material, and the second aerosol-generating section comprising a foam comprising a foam-forming agent and an aerosol-forming agent in a non-free liquid state in the foam, the foam being configured to generate an aerosol upon heating, and disposed closer to the upstream end than any aerosol-generating section comprising the tobacco material; a heating device including at least one heater arranged in the region of or facing the second aerosol-generating portion; Includes.

[0041] In one mode, the heating device includes only one heater positioned only in or facing the region of the second aerosol-generating portion.

[0042] In another mode, the heating device comprises only one heater located in or facing the region of the first and second aerosol-generating portions.

[0043] In another mode, the heating device comprises a first heater arranged in or facing the area of ​​the first aerosol-generating portion and a second heater arranged in or facing the area of ​​the second aerosol-generating portion, both heaters being controllable or controlled by a controller of the device independently of each other. In particular, the first and second heaters may be controlled by one or more of the following parameters: temperature, power, voltage, frequency, duty cycle, heating time, switching on, switching off. The heaters may be of resistive, electromagnetic induction, infrared, microwave or combinations thereof.

[0044] Finally, at least one aerosol-generating portion may be formed from a plurality of beads to enhance flavor and nicotine extraction.

[0045] In this application, weight percentage values ​​are expressed on a dry basis unless otherwise specified.

[0046] The invention will now be described with reference to non-limiting examples and drawings. [Brief description of the drawings]

[0047] [Figure 1] 1 illustrates various embodiments of an aerosol product. [Diagram 2] 1 illustrates various embodiments of an aerosol product. [Diagram 3] 1 illustrates various embodiments of an aerosol product. [Figure 4] 1 illustrates various embodiments of an aerosol product. [Diagram 5]1 illustrates various embodiments of an aerosol product. [Figure 6] The effects obtained by the present invention will be described. [Figure 7] 1 illustrates a further embodiment of an aerosol product. [Figure 8] 1 illustrates a further embodiment of an aerosol product. [Figure 9] 1 illustrates a further embodiment of an aerosol product. [Figure 10] 1 illustrates a further embodiment of an aerosol product. [Figure 11] 1 illustrates a further embodiment of an aerosol product. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] As can be seen from FIG. 1, the aerosol product article 10 described herein is substantially rod-like or cylindrical in shape, with approximately one-third to one-half of the length corresponding to the aerosol-generating substrate, also called a plug, which can be considered semi-solid, and which is heated by a heating zone delimited by an external heater of the aerosol generating device, indicated as 12. The aerosol-generating substrate comprises a first tobacco-containing portion 14 and a second aerosol-generating portion 16, both of which are therefore positioned within the heating zone 12 during use. The aerosol product article further comprises, in the downstream direction of the aerosol flow path, a cooling tubular member 22 and a filter 24 at the mouth end. The cooling tubular member 22 may for example comprise a paper tube or some other hollow structure, at least partially rigid, making it possible to provide sufficient space and surface for cooling the aerosol. An additional tubular member, such as that described in EP 3 881 699 A1, having a smaller internal diameter (i.e. a "central bore" section) than the cooling member, may be positioned between the cooling tubular member 22 and the filter. The filter 24 may include one or several filter sections made of cellulose acetate, paper sheets, charcoal, combinations thereof, and the like. The filter may include one or more flavoring elements, such as frangible capsules or flavor beads. In the embodiment of FIG. 1, the substrate as a whole is substantially divided in half by the first and second aerosol-generating portions 14, 16. In other words, the first and second aerosol-generating portions 14, 16 are approximately the same size. Arrow A indicates heat flow in all figures.

[0049] The flavour and nicotine extraction may be enhanced by a through hole 20, which may be formed by an air hole hollow tube, which may be substantially in the centre of the parts 14, 16 as shown in Figure 2, and may have a diameter of approximately one third of the plug diameter. The through hole 20 may be formed in the material of the aerosol generating part itself, or may be provided by a separately inserted tube having the necessary air permeability. This also applies to the multiple through holes described below. For example, the through hole 20 may have a diameter of 1-3.5 mm and the article may have an outer diameter of 5.5-8 mm.

[0050] The flavor and nicotine extraction is further enhanced by multiple through holes as shown in FIG. 3, which can be formed by multiple airflow hollow tubes. These are typically smaller in diameter than the through holes of the embodiment of FIG. 2. For example, each through hole has a diameter comprised between 0.5 and 1.5 mm, and the article has an outer diameter of 5.5 to 8 mm. As a result of the surface of the through holes contacting the foam, the heat flow is increased and more flavor and nicotine can be extracted. Furthermore, multiple through holes can be present throughout the plug in addition to those shown in FIG. 3. As a result of the larger contact surface between the multiple through holes and the foam, the heat flow that can carry the volatile substances is further increased. Furthermore, these multiple through holes and the through hole 20 shown in FIG. 2 do not necessarily extend in perfect alignment with the axial or longitudinal direction of the plug, which is usually cylindrical in shape. Rather, the through holes can extend at an angle to the longitudinal direction and can include one or more curves or bends along the extension of the through holes.

[0051] Furthermore, the through hole or holes that essentially form a hollow tube for airflow do not necessarily need to extend through both the first and second aerosol-generating portions. Rather, they may extend only into the second aerosol-generating portion, as shown in Figure 4, thereby maximizing aerosol generation from the foam. Again, a single through hole 20 as shown in Figure 2 may be provided.

[0052] In the embodiment of FIG. 5, the first aerosol-generating portion containing the foam or mousse and tobacco is subdivided into small elements that may be of the same or different shape and size. These small elements may be formed as beads, for example, 1 or 2 millimeters in size. In either case, there are multiple voids between the elements, which allow the flow of heat to pass and the extraction of flavor and nicotine. These small elements may be encased and maintained by the wrapping of the article. Thus, voids are also provided between the small elements and the wrapping.

[0053] Any of the above described embodiments will result in the release of flavour and nicotine as shown in FIG. 6, where the flavour and nicotine are released in a relatively concentrated manner within a short period of time and remain at a high and relatively steady level after reaching a particular peak.

[0054] As can be seen from Fig. 7, separate heaters 12 may be provided for the parts 14, 16. In this case, both heaters 12 may provide the same or different heating profiles. For example, a higher temperature may be applied to the second aerosol-generating part 16 in order to generate a particularly large amount of aerosol that will penetrate and contribute to the heating of the tobacco-containing part 14. Consequently, a lower heating temperature may be applied to the tobacco-containing part 14, which may still be high enough to extract nicotine into the aerosol. Alternatively, a higher heating temperature may be applied to the tobacco-containing part 14 in order to improve the sensory experience with respect to the tobacco. Nevertheless, a sufficient heating temperature is applied to the second aerosol-generating part 16 in order to generate visible vapor. Finally, different heating modes may be provided by the controller of the device in order to allow the user to select the heating mode depending on the desired vapor inhalation experience. In summary, the sensory experience may be customized by heating the parts 14 and 16 independently of each other. In this connection, it goes without saying that the embodiment shown in Fig. 7 with separate heaters 12 is also applicable to the embodiments of Figs. 2 to 5.

[0055] This also applies to the embodiments shown in Figures 8 to 11. In these embodiments, which may also be provided appropriately in the embodiment of Figure 1, i.e. in an embodiment without through holes 20, only the second aerosol-generating portion 16 is heated, and not the tobacco-containing portion 14. The heater 12 may be arranged only in the area of ​​the second aerosol-generating portion 16. As shown in Figures 8 to 11, the cooling tubular member 22 may then be omitted. In this case, the tobacco-containing portion 14 is adjacent to the filter 24. The heat generated in the second aerosol-generating portion 16 then penetrates and heats the tobacco-containing portion 14. As a result, the aerosol passing through the tobacco-containing portion 14 is cooled, which allows the cooling tubular member 22 to be omitted as described above. As shown in Figures 8 and 11, the above-mentioned features specific to these embodiments may also apply to all the embodiments of Figures 1 to 5.

[0056] An example of a recipe for the second aerosol portion, i.e. (e) mousse or foam, is as follows:

[0057] [Table 1]

[0058] The e-mousse may contain flavourings such as, for example, ethyl vanillin, menthol, spearmint oil, berry, fruit, root or herb extracts or oils.

[0059] The e-mousse may include a pH adjusting agent selected from, for example, one or more of sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, and the like, and mixtures thereof.

Claims

1. An aerosol-producing article (10) for a non-combustion aerosol-generating device, the article (10) comprising an air inlet end forming an upstream end thereof, a mouth end forming a downstream end thereof, and an aerosol-generating substrate disposed between the upstream end and the downstream end; the substrate includes a first aerosol-generating portion (14) and at least one second aerosol-generating portion (16) located closer to the upstream end than the first aerosol-generating portion (14), whereby an airflow is configured to pass through the second aerosol-generating portion (16) before passing through the first aerosol-generating portion (14); The aerosol product (10) is positioned closer to the upstream end than either of the aerosol-generating sections (14) that contain tobacco material, and the second aerosol-generating section (16 ...

2. 10. The aerosol product (10) of claim 1, wherein the foam of the second aerosol-generating portion (16) further comprises a foam stabilizer and / or a flavoring agent.

3. 3. The aerosol product (10) of claim 1 or 2, wherein the foam-forming agent is selected from the group consisting of, but not limited to, a hydrocolloid selected from the group of agar, gellan gum, lecithin, an emulsifier selected from the group of polyglycerol fatty acid esters, glycerol fatty acid esters, sorbitan fatty acid esters, and / or mixtures thereof.

4. 3. The aerosol product (10) of claim 2, wherein the foam stabilizer is selected from the group consisting of cellulose gums, hydroxyalkylated carbohydrates, derivatives thereof, and mixtures thereof.

5. 5. The aerosol product (10) according to claim 2 or 4, wherein the foam stabilizer comprises a cellulose gum, in particular carboxymethyl cellulose (CMC) or a derivative thereof, and / or cellulose fibers.

6. 3. The aerosol product (10) of claim 1 or 2, wherein the aerosol forming agent in the second portion (16) is in an amount of at least 40% by weight, preferably at least 50% by weight, and preferably comprises propylene glycol, glycerin, or a combination thereof.

7. 3. The aerosol product (10) of claim 1 or 2, wherein the first aerosol-generating portion (14) comprises tobacco powder and / or tobacco cut filler.

8. 7. The aerosol product (10) of claim 6, wherein the first aerosol-generating portion (14) comprises a reconstituted tobacco substrate and / or tobacco flakes.

9. 10. The aerosol product article of claim 8, wherein the first aerosol-generating portion comprises a reconstituted tobacco base comprising 50-80% by weight of tobacco material, 10-25% by weight of an aerosol-forming agent, 0-15% by weight of cellulose fiber, and 0-10% by weight of a binder (e.g., guar gum).

10. 10. The aerosol product (10) of claim 9, wherein the reconstituted tobacco substrate is formed as a fluted sheet, a strip, a granule, or a combination thereof.

11. 3. The aerosol product article (10) of claim 1 or 2, wherein the substrate (14, 16) is surrounded by an outer wrapper.

12. 3. The aerosol production article (10) of claim 1 or 2, further comprising a filter (24) and a spacing / cooling section (22) between said filter (24) and said aerosol-generating section (14, 16).

13. 3. The aerosol-producing article (10) of claim 1 or 2, further comprising a filter (24) adjacent the first aerosol-generating portion (14).

14. 3. An aerosol production article (10) according to claim 1 or 2, wherein at least one aerosol-generating portion (14, 16) comprises at least one, preferably a plurality of airflow hollow tubes (20) extending in the airflow direction.

15. the aerosol-generating substrate comprises a plurality of hollow airflow tubes (20) extending within the second aerosol-generating portion (16); or 3. The aerosol-producing article (10) of claim 1 or 2, wherein at least one aerosol-generating portion (14, 16) is formed from a plurality of beads.

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