Consumable article and aerosol generation system

Abstract

There is disclosed a consumable article (100, 200, 300) comprising: a resistive heating portion (102) configured to generate heat via resistive heating when an electrical current is passed through the resistive heating portion (102); an aerosol precursor material (104); and a non-combustible heat transfer layer (106) between the resistive heating portion (102) and the aerosol precursor material (104) configured to transfer heat between the resistive heating portion (102) and the aerosol precursor material (104).

Description

[0001] Consumable Article and Aerosol Generation System

[0002] The present disclosure relates to a consumable article and an aerosol generation system comprising an aerosol generation device configured to receive the consumable article.

[0003] Various devices and systems are available that heat aerosol precursor material to release aerosol / vapour for inhalation. For example, these devices and systems do not rely on burning the aerosol precursor material. In some examples, e-cigarettes vaporize an e-liquid from a consumable article to an inhalable vapour / aerosol. In some other examples, there is a device which heats a solid aerosol precursor material to generate an aerosol.

[0004] In some examples, there may be provided a consumable article comprising a combustible heat source which itself combusts to heat up the aerosol precursor material provided in the consumable article. In such examples, the intention is still to not combust the aerosol precursor material (in other words, heat the aerosol precursor material without burning it). For example, heat generated by the combustion of the combustible heat source is used to heat the aerosol precursor material in order to release the aerosol / vapour.

[0005] However, combusting the combustible heat source may provide little control over how the aerosol precursor material is heated. Also, for example, certain undesired particles released due to combustion of the combustible heat source may flow into the aerosol precursor material and into the aerosol to be inhaled, which reduces a user’s sensory experience.

[0006] It is an object of the present invention to overcome at least the above- mentioned problems.

[0007] Summary According to a first aspect of the present disclosure, there is provided a consumable article comprising: a resistive heating portion configured to generate heat via resistive heating when an electrical current is passed through the resistive heating portion; an aerosol precursor material; and a non-combustible heat transfer layer between the resistive heating portion and the aerosol precursor material configured to transfer heat between the resistive heating portion and the aerosol precursor material.

[0008] Advantageously, the resistive heating portion provides heat responsive to an electrical current passing through it, and it is not necessary to provide a component which undergoes combustion within the consumable article. Employing a resistive heating portion also provides better control over heating given that the characteristics of electrical power supplied to the resistive heating portion can be controlled. On the other hand, combustion of a material cannot be as well controlled in this context. In addition, there is provided a non-combustible heat transfer layer, which, advantageously, transfers and can distribute the heat generated by the resistive heating portion to the aerosol precursor material. In this manner, the aerosol precursor material can be heated to generate aerosol. Also, advantageously, the non-combustible heat transfer layer does not combust in response to the heat generated by the resistive heating portion. Accordingly, combustion of the aerosol precursor material is inhibited due to the presence of the non-combustible heat transfer layer between the aerosol precursor material and the resistive heating portion. This is advantageous because combustion of the aerosol precursor material may release particles which are undesired in aerosol for inhalation, which is mitigated in the present case.

[0009] Optionally, the non-combustible heat transfer layer is configured to form a barrier to the flow of a fluid between the resistive heating portion and the aerosol precursor material such that the resistive heating portion is concealed from the aerosol precursor material.

[0010] Advantageously, the non-combustible heat transfer layer may form a barrier to the flow of a fluid from the resistive heating portion towards the aerosol precursor material. Therefore, undesired particles released from the resistive heating portion can be inhibited from flowing into the aerosol precursor material and / or mixing with the aerosol to be inhaled.

[0011] For the avoidance of doubt, when the non-combustible heat transfer layer is arranged in the consumable article to form a barrier to the flow of a fluid from the resistive heating portion towards the aerosol precursor material, it is further arranged between the aerosol precursor material and the resistive heating portion in combination with other flow paths of the consumable article in such a way that it’s inclusion does not prevent or hinder a desired amount of airflow and aerosol flow, and circulation in and through the aerosol precursor material in use, such that aerosol generation and inhalation in use can normally take place. In other words, the non-combustible heat transfer layer does not alter the resistance to draw of the consumable article away from a desired resistance to draw because other flow paths are provided in the consumable article.

[0012] Optionally, the non-combustible heat transfer layer comprises metal.

[0013] Advantageously, the non-combustible heat transfer layer comprising metal means that a highly thermally conductive non-combustible heat transfer layer is provided. The use of metal therefore provides good heat transfer characteristics and provides for avoidance of combustion.

[0014] Optionally, the resistive heating portion comprises an organic conductive material, such as carbon or charcoal.

[0015] Advantageously, organic conductive materials are suitably conductive and cost effective. In addition, organic conductive materials are carbon based, and advantageously do not need to be separated from the aerosol precursor material to be biodegraded after the consumable article has been used.

[0016] Optionally, one or more surface regions of the resistive heating portion are exposed to form electrical contacts accessible to electrodes or connectors of an outer power source.

[0017] Advantageously, such one or more surface regions being configured for electrical contact provides for electrical power to be delivered to the resistive heating portion, so that the resistive heating portion can generate heat responsive to the consequent current flow.

[0018] Optionally, the aerosol precursor material comprises one or more electrical conductors configured to conduct electrical current through the aerosol precursor material. Advantageously, configuring the aerosol precursor material to be able to conduct an electrical current means that resistive heating can take place directly within the aerosol precursor material, in addition to the heat generated from the resistive heating portion. This advantageously provides greater control over how the aerosol precursor material is heated.

[0019] Optionally, the consumable article has a flat profile such that a thickness of the consumable article is smaller than 20% of any one of the remaining two spatial dimensions of the consumable article.

[0020] Advantageously, the consumable article provided in a flat profile may allow for a layered structure with different layers having different functions. Such a configuration may also provide for ease of manufacture.

[0021] Optionally, the resistive heating portion is in the form of a resistive heating layer occupying a first portion of the thickness of the consumable article; the aerosol precursor material is in the form of an aerosol precursor material layer occupying a second portion of the thickness of the consumable article, the second portion being different to the first portion.

[0022] Advantageously, the different layers / materials are arranged along the thickness direction of the consumable article. A layered structure is therefore provided in which each layer can have a large surface area contacting the adjacent layers. A thickness of the consumable article can be varied according to the number and thickness of individual layers.

[0023] Optionally, a mouthpiece aligned with the resistive heating layer and the aerosol precursor material layer along a longitudinal axis, the longitudinal axis of the consumable article being perpendicular to the thickness, the mouthpiece occupying the first portion of the thickness and the second portion of the thickness, wherein: the noncombustible heat transfer layer is configured to form a barrier to the flow of a fluid between the resistive heating layer and the mouthpiece such that the resistive heating layer is concealed from the mouthpiece. Advantageously, the barrier between the resistive heating layer and the mouthpiece inhibits undesired particles from flowing in the direction of the aerosol and through the mouthpiece when the user draws on the mouthpiece.

[0024] Optionally, the consumable article is in the form of a cylindrical body extending along a longitudinal axis. A first portion of the cylindrical body along the longitudinal axis of the cylindrical body constitutes the resistive heating portion; a second portion of the cylindrical body along the longitudinal axis of the cylindrical body constitutes the noncombustible heat transfer layer; and a third portion of the cylindrical body along the longitudinal axis of the cylindrical body constitutes the aerosol precursor material.

[0025] Advantageously, the consumable article may be provided in the form of a cylindrical body with different portions provided along a longitudinal axis. Such a construction may provide for ease of manufacture. A cylindrical consumable article may provide a familiar consumable shape for a user and provide for intuitive use. A cylindrical body also, advantageously, provides flexibility in terms of the consumable article being received in an aerosol generation device.

[0026] Optionally, the cylindrical body is one of an elliptical cylinder, a right circular cylinder, an oblique cylinder, a hollow cylinder, or a cylinder with a non-circular and non-elliptical cross section taken perpendicular to the longitudinal axis.

[0027] Advantageously, by providing such different kinds of cylindrical bodies, the shape of the cylindrical consumable article may be adapted in various ways, for example, to fit different kinds of receiving regions provided in an aerosol generation device and the like.

[0028] According to a second aspect of the present disclosure, there is provided an aerosol generation system comprising: the consumable article according to the first aspect; and an aerosol generation device configured to receive the consumable article, the aerosol generation device comprising: a set of electrodes configured to make electrical contact with the consumable article, in particular with the resistive heating portion thereof, when the consumable article is received in the aerosol generation device, the set of electrodes configured to supply an electrical current to the consumable article. Advantageously, there is provided a system in which heat is resistively generated without combustion, and the heat is transferred through a non-combustible heat transfer layer to the aerosol precursor material. The user can conveniently insert the consumable article into the aerosol generation device to supply electrical power to the resistive heating portion of the consumable article.

[0029] Optionally, in the system according to the second aspect, the set of electrodes comprises two or more electrically conductive rings.

[0030] Advantageously, the electrically conductive rings can be used with examples of the consumable article having a cylindrical body. The cylindrical body can easily be inserted in the aerosol generation device to provide the desired electrical connection. By virtue of the ring shape, there are advantageously provided large electrical contact surface areas.

[0031] Optionally, in the system according to the second aspect, the set of electrodes comprises two or more electrically conductive curved portions, wherein the curved portions are curved in correspondence with a curvature of the cylindrical body.

[0032] Advantageously, the curved portions provide a relatively large electrical contact area with the resistive heating portion of the consumable article.

[0033] Optionally, the set of electrodes comprises two or more elongate conductive portions. Advantageously, the elongate conductive portions can be used with examples of the consumable article having a flat profile.

[0034] Optionally, the set of electrodes comprises a subset of electrodes configured to supply an electrical current to the aerosol precursor material.

[0035] Advantageously, such a subset of electrodes can be used with examples where the aerosol precursor material comprises one or more electrical conductors to provide greater control over the manner in which the aerosol precursor material is heated. In addition, the burden to generate heat on the resistive heating portion is reduced.

[0036] Various combinations of the above referenced features are envisaged. Brief Description of the Drawings

[0037] Examples of the present disclosure will now be described with reference to the drawings, in which:

[0038] Figure 1 is a simplified schematic sketch of a consumable article, according to examples;

[0039] Figure 2 is a schematic perspective view of a first consumable article, according to examples;

[0040] Figure 3 is a schematic perspective view of a second consumable article, according to examples;

[0041] Figure 4 is a schematic side view of the second consumable article, according to examples;

[0042] Figure 5 is a simplified schematic sketch of an aerosol generation system, according to examples;

[0043] Figure 6 is a schematic internal view showing a first aerosol generation device, according to examples;

[0044] Figure 7 is a schematic top-down view of a second aerosol generation device, according to examples;

[0045] Figure 8 is a schematic front view of an electrically conductive curved portion, according to examples; and

[0046] Figure 9 is a schematic internal view of a third aerosol generation device, according to examples.

[0047] Detailed Description

[0048] As used herein, the term “aerosol precursor material”, “vapour precursor material” or “vaporizable material” may refer to a smokable material which may for example comprise nicotine or tobacco and a vaporising agent. The aerosol precursor material is configured to release an aerosol when heated. Tobacco may take the form of various materials such as shredded tobacco, granulated tobacco, tobacco leaf and / or reconstituted tobacco. Nicotine may be in the form of nicotine salts. Suitable aerosol precursor materials include: a polyol such as sorbitol, glycerol, and glycols like propylene glycol or triethylene glycol; a non-polyol such as monohydric alcohols, acids such as lactic acid, glycerol derivatives, esters such as triacetin, triethylene glycol diacetate, triethyl citrate, glycerin or vegetable glycerin. In some examples, the aerosol precursor material is substantially a liquid or a gel that holds or comprises one or more solid particles, such as tobacco particles extracted from tobacco materials. For example, the aerosol precursor material comprises tobacco particles suspended in a solution or gel.

[0049] As used herein, the term “aerosol generation device” is synonymous with “aerosol provision device” or “device” may include a device configured to heat an aerosol precursor material and deliver an aerosol to a user. In some examples, the aerosol precursor material is a solid. In other words, the aerosol precursor material is not configured to flow in an unheated state. The device may be portable. “Portable” may refer to the device being for use when held by a user. The device may be adapted to generate a variable amount of aerosol, which can be controlled by a user input.

[0050] As used herein, the term “aerosol” may include a suspension of vaporizable material as one or more of: solid particles; liquid droplets; gas. Said suspension may be in a gas including air. Aerosol herein may generally refer to / include a vapour. Aerosol may include one or more components of the vaporizable material.

[0051] Figure 1 is a simplified schematic sketch of a consumable article 100, according to examples. The consumable article 100 comprises a resistive heating portion 102 configured to generate heat via resistive heating when an electrical current is passed through the resistive heating portion 102. In these examples, the consumable article 100 comprises an aerosol precursor material 104. In these examples, the consumable article 100 also comprises a non-combustible heat transfer layer 106. The noncombustible heat transfer layer 106 is between the resistive heating portion 102 and the aerosol precursor material 104. The non-combustible heat transfer layer 106 is configured to transfer heat between the resistive heating portion 102 and the aerosol precursor material 104.

[0052] For example, the non-combustible heat transfer layer 106 is in thermal contact with both the resistive heating portion 102 and the aerosol precursor material 104. Heat generated by the resistive heating portion 102 is transferred to the aerosol precursor material 104 via the non-combustible heat transfer layer 106. Advantageously therefore, there is provided the non-combustible heat transfer layer 106 which transfers and can distribute the heat generated by the resistive heating portion 102 to the aerosol precursor material 104 so that aerosol may be generated from the aerosol precursor material 104. For example, the non-combustible heat transfer layer 106 may be configured to distribute heat substantially (within acceptable tolerances) evenly over a surface of the non-combustible heat transfer layer 106 which is in thermal contact with the aerosol precursor material 104. For example, the heat is conducted within and spreads through the non-combustible heat transfer layer 106. In other words, the non-combustible heat transfer layer 106 has appropriate thermal conductivity such that significant local high temperatures (hot spots) are avoided. For example, the non-combustible heat transfer layer 106 is thermally conductive to a degree appropriate to perform the function of relatively even heat distribution given the dimension of the consumable article 100 and the heat generation rate of the resistive heating portion 102.

[0053] In these examples, the consumable article 100 is intended for use in a manner that the aerosol precursor material 104 does not combust. In other words, during use, the aerosol precursor material 104 is heated such that aerosol is generated (for example, for the purpose of inhalation by a user), but the aerosol precursor material 104 does not burn. For example, combustion does not take place in the aerosol precursor material 104. For example, a chemical reaction and / or phase change corresponding or issuing to combustion (or burning) does not occur in the aerosol precursor material 104 during normal use of the consumable article 100.

[0054] In these examples, the non-combustible heat transfer layer 106 is configured to remain in a non-combusted state during use of the consumable article 100. For example, the non-combustible heat transfer layer 106 does not combust at the highest temperatures intended to be produced by the resistive heating portion 102. For example, the non- combustible heat transfer layer 106 is composed of a material / material blend or composition which does not combust at the highest temperature which may be produced by the resistive heating portion 102 during use, which is typically between 150°C and 350°C, preferably between 200°C and 300°C.

[0055] Given that the non-combustible heat transfer layer does not combust in response to the heat generated by the resistive heating portion 102, combustion of the aerosol precursor material is inhibited due to the presence of the non-combustible heat transfer layer 106 between the aerosol precursor material 104 and the resistive heating portion 102. For example, the non-combustible heat transfer layer 106 transfers heat to the aerosol precursor material (for example, relatively evenly so that significant local high temperatures are avoided), and also does not itself combust during use. In otherwords, if the heat transfer layer was capable of combustion at the temperature in question, there would be a risk of the aerosol precursor material 104 also combusting, which is not desired in the present case.

[0056] For example, during use, air enters the aerosol precursor material 104 and mixes with the components released from the aerosol precursor material 104 due to the heating of the aerosol precursor material 104. The aerosol, as referred to herein, is the mixture of the air and the components released from the aerosol precursor material. The aerosol flows into the user’s mouth when the user draws on the consumable article 100. In this manner, a stream of aerosol is provided for inhalation by the user.

[0057] For brevity, the non-combustible heat transfer layer 106 is hereafter referred to simply as the heat transfer layer 106. However, it should be noted that the heat transfer layer 106 is non-combustible in the described manner in all examples of the invention.

[0058] As described, the resistive heating portion 102 is configured to generate heat via resistive heating. For example, the resistive heating portion 102 has an electrical resistance. Those skilled in the art will appreciate that when current flows through a material with electrical resistance, heat is generated by virtue effectively of friction of the charge carriers moving through the material.

[0059] In these examples, during use, a current is caused to flow in the resistive heating portion 102 in order that the resistive heating portion 102 generates heat. For example, during use, the resistive heating portion 102 forms part of an electrical circuit such that current is caused to flow through the resistive heating portion 102.

[0060] For example, the resistive heating portion 102 comprises an electrically conductive material, and with an appropriate electrical resistance for generating enough heat to generate aerosol from the aerosol precursor material 104.

[0061] Advantageously, the resistive heating portion 102 provides heat responsive to an electrical current passing through it, and it is not necessary to provide a component which undergoes combustion within the consumable article 100. Employing a resistive heating portion 102 also provides better control over heating given that the characteristics of electrical power supplied to the resistive heating portion can be controlled. On the other hand, combustion of a material cannot be as well controlled in this context.

[0062] In some examples, the resistive heating portion 102 comprises an organic conductive material. For example, the organic conductive material may comprise carbon. For example, the organic conductive material may be charcoal. In other examples, the electrically conductive material may be inorganic.

[0063] Advantageously, organic conductive materials provide suitable electrical conductivity for application in the described consumable articles. Furthermore, organic conductive materials may be relatively inexpensive and / or lightweight and suitable for inclusion in the consumable intended to be discardable. For example, the organic conductive material is carbon based. Advantageously, the carbon-based material does not need to be separated from the aerosol precursor material (e.g., tobacco) in order to be biodegraded after use. Therefore, use of an organic conductive material provides the advantage of ease of discarding the consumable article.

[0064] As described, the heat transfer layer 106 is configured to transfer heat. In some examples, the heat transfer layer 106 may be so configured by virtue of comprising a material (e.g., a metal such as stainless steel or aluminium) with a thermal conductivity appropriate for transferring enough heat to the aerosol precursor material 104 so as to cause aerosol to be generated.

[0065] In some examples, the non-combustible heat transfer layer 106 comprises metal. In some such examples, the non-combustible heat transfer layer 106 comprises aluminium. For example, the non-combustible heat transfer layer 106 may be a piece of aluminium. Likewise, the heat transfer layer 106 may be formed of a thin foil of stainless steel, brass or copper.

[0066] Advantageously, providing a non-combustible heat transfer layer 106 which comprises metal provides a layer which is highly thermally conductive. Additionally, a metal is highly unlikely to combust due to the temperatures produced by the resistive heating portion 102. The use of metal therefore provides good heat transfer characteristics and provides for avoidance of combustion. In some examples, the heat transfer layer 106 is configured to form a barrier between the resistive heating portion 102 and the aerosol precursor material 104 such that the resistive heating portion 102 is concealed from the aerosol precursor material 104. For example, respective surfaces of the resistive heating portion 102 and the aerosol precursor material 104 which would otherwise directly face one another are concealed from one another by the presence of the heat transfer layer 106 therebetween. For example, the resistive heating portion 102 and the aerosol precursor material 104 are not exposed to each other because of the presence of the heat transfer layer 106. The heat transfer layer 106 may form a barrier to the flow of a fluid from the resistive heating portion 102 towards the aerosol precursor material 104. For example, the fluid comprises matter in gas and / or liquid form. In some examples, the heat transfer layer 106 is substantially impermeable.

[0067] For example, the heat transfer layer 106 is of a geometry and size such that it entirely covers a surface of at least one of the resistive heating portion 102 and the aerosol precursor material 104 which faces in the direction of the other of the resistive heating portion 102 and the aerosol precursor material 104.

[0068] As described, during aerosol generation, air flows into the aerosol precursor material 104 and mixes with the components released from the aerosol precursor material 104 due to the heating. The consumable article 100 may comprise a covering (e.g., comprising cellulose-based material such as paper, card, cellulose acetate) which at least partly covers the consumable article 100. For example, the aerosol precursor material 104 may be covered by a tube of paper. While the heat transfer layer 106 may form a barrier to the flow of a fluid from the resistive heating portion 102 towards the aerosol precursor material 104, there are provided other flow paths for air to flow into the aerosol precursor material 104, which do not encounter the heat transfer layer 106. For example, openings in the covering over the aerosol precursor material 104 may be provided for air to flow directly into the aerosol precursor material 104 without encountering the heat transfer layer 106. Specific examples of such openings are described further below.

[0069] In this manner, the presence of the heat transfer layer 106 between the resistive heating portion 102 and the aerosol precursor material 104 does not prevent or hinder air flowing into the aerosol precursor material 104 via other flow paths, or the flow of aerosol out of the aerosol precursor material 104 via other flow paths (which is, for example, in a direction away from the heat transfer layer 106) during use. For example, circulation in and through the aerosol precursor material 104 is still possible, even with the presence of the heat transfer layer 106. In other words, the resistance to draw of the consumable article 100 is not altered from a desired resistance to draw, even with the presence of the heat transfer layer 106, because other flow paths into the aerosol precursor material 104 are provided to achieve the desired resistance to draw.

[0070] As described, the resistive heating portion 102 generates heat by virtue of its electrical resistance when an electrical current flows through it. The resistive heating portion 102 does not undergo combustion during use. Therefore, far fewer undesired particles are released from the resistive heating portion 102 during heating as compared to a combustible heat source which is combusted to generate heat. Nevertheless, some undesired particles may be released during heating of the resistive heating portion 102 by resistive heating when there is a supply of an electrical current.

[0071] For example, the heat transfer layer 106 forming a barrier to fluid flow between the resistive heating portion 102 and the aerosol precursor material 104 provides the advantage that the undesired particles are inhibited from flowing into the aerosol precursor material and / or mixing with the aerosol to be inhaled. Accordingly, the heat transfer layer 106 not only improves aspects of heating of the aerosol precursor material 104, but also improves the quality of the aerosol by providing for at least some undesired particles to be omitted from the aerosol which is to be inhaled.

[0072] For example, the resistive heating portion 102 may be placed in electrical contact with a set of electrodes, connectors or the like which provide electrical power in a manner that causes an electrical current to flow within the resistive heating portion 102. For example, the resistive heating portion 102 may be placed in electrical contact with a pair of electrodes which (when active / switched on) have a potential difference between them. When in electrical contact with the resistive heating portion 102, such a pair of electrodes would cause an electrical current to flow within the resistive heating portion 102 due to the potential difference. Reference is made herein to “electrical power” being supplied. It should be understood the electrical power is supplied in a manner such that electrical current is caused to flow in the region / portion of the consumable article in question. In some examples, one or more surface regions of the resistive heating portion 102 are exposed to form electrical contacts accessible to electrodes or connectors of an outer power source. Advantageously, such one or more surface regions being configured for electrical contact provides for electrical power to be delivered to the resistive heating portion 102, so that the resistive heating portion 102 can generate heat responsive to the consequent current flow. For example, the outer power source is “outer” in the sense that the outer power source is not part of the consumable article 100. For example, the outer power source is external to the consumable article 100. For example, the outer power source may be part of an aerosol generation device configured to receive the consumable article 100.

[0073] For example, there may be one or more surface regions of the resistive heating portion 102 which are able to provide electrical contact with external electrodes / connectors in a manner so that an electrical current can be caused to flow within the resistive heating portion 102. For example, the one or more surface regions are not covered up by another layer. In some examples, the entirety of the resistive heating portion 102 is exposed such that there is no covering on the outer surfaces of the resistive heating portion 102 (of course, it will be understood that the surface in thermal contact with the heat transfer layer 106 would not be exposed and is not described as an “outer” surface).

[0074] The manner in which the resistive heating portion 102 may be supplied with electrical power is described further below in the context of an aerosol generation device.

[0075] In some examples, the aerosol precursor material 104 comprises one or more electrical conductors configured to conduct electrical current through the aerosol precursor material 104. In such examples, the aerosol precursor material 104 may itself generate heat via resistive heating. In such examples, where there is a covering over the aerosol precursor material, there may be one or more surface regions of the aerosol precursor material 104 which are exposed to form electrical contacts accessible to electrodes or connectors of the outer power source. The one or more surface regions may be different to the openings for the purpose of airflow into the aerosol precursor material 104.

[0076] For example, one or more electrical conductors (e.g., particles of said one or more electrical conductor materials) may be mixed in with the aerosol precursor material 104 such that there are conductive particles dispersed through the aerosol precursor material 104. In these examples, if an electrical current is supplied to the electrically conductive aerosol precursor material 104, resistive heating may take place. For example, the one or more electrical conductors comprise particles comprising carbon. In some examples, the one or more electrical conductors comprise charcoal. In some examples, the one or more electrical conductors are dispersed through the aerosol precursor material 104 in the form of small particles. In some examples, the aerosol precursor material 104 has within it layers of the one or more electrical conductors arranged therein.

[0077] Advantageously, configuring the aerosol precursor material 104 to be able to conduct an electrical current means that resistive heating can take place directly within the aerosol precursor material. This advantageously provides greater control over how the aerosol precursor material is heated. The advantages to resistive heating directly in the aerosol precursor material are discussed further below in the context of an aerosol generation device. In this example, the set of electrodes of the aerosol generation device may include a subset of electrodes to provide electric power to the aerosol precursor material 104. That is to say that the electric power provided to the aerosol precursor material 104 may be different to the electric power provided to the resistive heater 102. For example, the subset of electrodes may be independently controlled from other of the set of electrodes which provide electrical power to the resistive heating portion 102. In other examples, there may be a common electric power provided to both the resistive heater 102 and the aerosol precursor material 104. That is to say that both the resistive heater 102 and the aerosol precursor material 104 receives electric power from the same set of electrodes.

[0078] In some examples, the consumable article 100 is in the form of a cylindrical body extending along a longitudinal axis. Figure 2 is a schematic perspective view of a first consumable article 200, according to examples. The first consumable article 200 comprises the cylindrical body 202 extending along the first longitudinal axis 204. As referred to herein, the first consumable article 200 includes all examples of the consumable article having a cylindrical body extending along a longitudinal axis.

[0079] The first consumable article 200 corresponds to more specific examples of the previously described consumable article 100. For example, the first consumable article 200 at least comprises the described resistive heating portion configured to generate heat via resistive heating when an electrical current is passed through the resistive heating portion, an aerosol precursor material; and a non-combustible heat transfer layer between the resistive heating portion and the aerosol precursor material configured to transfer heat between the resistive heating portion and the aerosol precursor material. The first consumable article 200 may also, optionally comprise any of the other features (in any combination) described above in the specific context of the consumable article 100.

[0080] In the examples of Figure 2, the first consumable article 200 comprises a first portion 206 of the cylindrical body 202 along the first longitudinal axis 204 of the cylindrical body 202 which constitutes the resistive heating portion 102. In the examples of Figure 2, the first consumable article 200 comprises a second portion 208 of the cylindrical body 202 along the first longitudinal axis 204 which constitutes the heat transfer layer 106. In the examples of Figure 2, the first consumable article 200 also comprises a third portion 210 of the cylindrical body 202 along the first longitudinal axis 204 which constitutes the aerosol precursor material 104. The first longitudinal axis 204 is perpendicular to a radial direction of the cylindrical body 202. It will be appreciated that the first, second and third portions 206, 208, 210 correspond to respective different portions of the consumable article along the longitudinal axis 104. In this manner, the first consumable article 200 is provided in the form of a cylindrical body with different portions (with respective different functions) provided along a longitudinal axis. Such a construction may provide for ease of manufacture with state-of-the art combining machinery used in the tobacco industry.

[0081] Advantageously, a cylindrical consumable article may also provide a familiar consumable shape for a user (e.g., compared to a traditional cigarette and the like) and provide for intuitive use (for example, manipulation in a manner familiar to the user). A cylindrical body may also, advantageously, provide flexibility in terms of the consumable article being received in an aerosol generating device. As a mere example, with a cylindrical portion (first portion 206) being provided as the resistive heating portion, there may be provided numerous physical arrangements for providing electrical contact with an external power source, as discussed in further detail below. That is because a cylindrical portion provides a large surface area where electrical contact may be made.

[0082] As previously described, during the generation of aerosol, air mixes with components released from the aerosol precursor material 104 due to heating. Accordingly, there is an inflow of air into the aerosol precursor material 104. In the examples of Figure 2, where the first consumable article 200 has a cylindrical body 202, the first portion 206 constituting the resistive heating portion 102 is towards a distal end of the first consumable article 200, whereas the third portion 210 constituting the aerosol precursor material 104 is further towards a proximal end of the first consumable article 200 (as compared to the first portion 206). As referred to herein, the distal end is the end farthest from the user’s mouth during use and the proximal end is the end closest to the user’s mouth during use. It will be appreciated that the aerosol flows towards the proximal end for inhalation during use.

[0083] However, in the examples of Figure 2, the heat transfer layer 106 occupies the second portion 208 between the first portion 206 (towards the distal end) and the third portion 210 (further towards the proximal end). The heat transfer layer 106 may form a barrier to the flow of a fluid from the resistive heating portion 102 towards the aerosol precursor material 104. However, as previously described, there are provided other flow paths for air to flow into the aerosol precursor material 104 such that the presence of the heat transfer layer 106 between the resistive heating portion 102 and the aerosol precursor material 104 does not prevent or hinder a desired amount of airflow into the aerosol precursor material, or the flow of aerosol out of the aerosol precursor material 104 during use via other flow paths.

[0084] For example, the first consumable article 200 may comprise a covering (e.g., comprising cellulose-based material such as paper, card, cellulose acetate) which cover at least one of the portions of the cylindrical body 202. For example, the aerosol precursor material 104 may be covered by a tube of paper. In the examples of Figure 2, there are provided openings 209 in the covering of the aerosol precursor material 104. The openings 209 are effectively regions where the aerosol precursor material is exposed to air, and any hindrance to airflow is omitted. There may be provided any number of openings 209 of any suitable shape and arrangement, depending on the desired airflow characteristics into the aerosol precursor material 104. In the examples of Figure 2, the openings 209 are in the form of slits, but other arrangements are possible such as substantially circular holes. In some examples, the openings 209 are arranged in a ring around a circumference of the aerosol precursor material 104.

[0085] In examples where the described one or more surface regions for the purpose of electrical contact are provided, said one or more surface regions are separate to the described openings 209 such that direct electrical contact with the aerosol precursor material 104 does not hinder airflow. In other words, the opening 209 may not be used for the purpose of electrical contact so as to maintain the desired airflow into the aerosol precursor material 104.

[0086] In the specific examples of Figure 2, there is shown the cylindrical body 202 in the form of a right circular cylinder. In these examples, the cylindrical body has two closed circular bases which are parallel, and the axis of the cylinder joins the centres of the two circular bases (as those skilled in the art will appreciate regarding a “right circular cylinder”). In these examples, the cylindrical body 202 is a special case of an elliptical cylinder (because a circle is a special case of an ellipse). However, in other examples of a cylindrical body, the cylindrical body of the first consumable article 200 may be an elliptical cylinder which does not have a circular base (where a cross-section taken perpendicular to the first longitudinal axis 204 is a non-circular ellipse rather than a circle). The cylindrical body may be any kind of elliptical cylinder.

[0087] In some examples, the cylindrical body is an oblique cylinder, a hollow cylinder, or a cylinder with a non-circular and non-elliptical cross section taken perpendicular to the first longitudinal axis 204.

[0088] Accordingly, the cylindrical body of the first consumable article 200 may take a number of different forms. Advantageously, by providing such different kinds of cylindrical bodies, the shape of the cylindrical consumable article may be adapted in various ways, for example, to fit different kinds of receiving regions provided in an aerosol generation device and the like.

[0089] In some examples of the first consumable article 200, there may be provided additional portions of the cylindrical body. For example, there may be provided a mouthpiece 212. For example, the mouthpiece 212 is intended for the user to draw on with their mouth in order to inhale aerosol. For example, the mouthpiece 212 end of the first consumable article 200 is the proximal and downstream end of the first consumable article 200 during use. For example, as previously described, the end towards which the resistive heating portion 102 is provided is the distal and upstream end of the first consumable article 200 during use. In some examples of the first consumable article 200, there may be provided a spacer region 214. For example, the spacer region 214 is between the aerosol precursor material 104 and the mouthpiece 212. In some examples, the purpose of the spacer region 214 is to allow for cooling of the aerosol generated from the aerosol precursor material 102 before passing into the mouthpiece 212 for inhalation. In some examples, the spacer region 214 may be formed of a simple tube of cellulose-based material (paper, card, cellulose acetate) devoid of any material except for the tube walls. In other examples, the spacer region 214 comprises a porous or crimped sheet material to perform the function of the spacer / cooling region 214.

[0090] In some examples, the mouthpiece 212 comprises a filter. For example, the filter may comprise cellulose acetate or, preferably, sheet material such as paper. For example, the filter may be included for the purpose of filtering out one or more components present within the aerosol, and / or to reduce the concentration of aerosol within the mixture of air and aerosol prior to inhalation, and / or to affect the resistance to draw for inhalation.

[0091] In some examples, the consumable article 100 has a flat profile. In these examples, a thickness of the consumable article 100 is smaller than 20% of any of the remaining two spatial dimensions of the consumable article 100. Figure 3 is a schematic perspective view of a second consumable article 300, according to examples. The second consumable article 300 has a flat profile. As referred to herein, the second consumable article 300 includes all examples of the consumable article having a flat profile.

[0092] The second consumable article 300 corresponds to more specific examples of the previously described consumable article 100. For example, the second consumable article 300 at least comprises the resistive heating portion configured to generate heat via resistive heating when an electrical current is passed through the resistive heating portion, an aerosol precursor material; and a non-combustible heat transfer layer between the resistive heating portion and the aerosol precursor material configured to transfer heat between the resistive heating portion and the aerosol precursor material. The second consumable article 300 may also, optionally comprise any of the other features (in any combination) described above in the specific context of the consumable article 100. Figure 4 is a schematic side view of the second consumable article 300, according to examples. In these examples, the dimension referred to as the thickness of the second consumable article 300 is the smallest spatial dimension of the second consumable article 300. In Figure 4, the thickness T is indicated by the double-sided arrow 402. For example, when considering the flat profile of the second consumable article 300, the remaining two spatial dimensions (in other words, the spatial dimensions other than thickness) may be referred to as the width and the length of the second consumable article 300.

[0093] It should be noted that relative dimensions shown in any of the Figures (e.g., Figures 3 and 4) are not to be construed as representative of actual relative dimensions or proportions. The Figures are provided to schematically illustrate certain features. For example, as described, the thickness T of the second consumable article 300 is smaller than 20% of the other two spatial dimensions. In Figures 3 and 4, a thickness is shown which allows the various layers to be labelled and referred to, and the figures are not intended to communicate relative sizes of the spatial dimensions of the second consumable article 300.

[0094] Advantageously, the second consumable article 300 provided in a flat profile may allow for a layered structure with different layers having different functions. Such a configuration may also provide for ease of manufacture in that different material can be constructed as the second consumable article 300 in layers.

[0095] In some examples, the resistive heating portion 102 is in the form of a resistive heating layer 401 occupying a first portion 404 of the thickness of the second consumable article 300. In such examples, the aerosol precursor material 104 is in the form of an aerosol precursor material layer occupying a second portion 406 of the thickness of the second consumable article 300, the second portion 406 being different to the first portion 404. In other words, the first and second portions 404, 406 are aligned along the thickness T of the second consumable article 300 such that the resistive heating portion 102 and the aerosol precursor material 104 are in the form of respective layers arranged along the thickness T of the second consumable article 300.

[0096] Reference is made to the term “resistive heating layer 401”. This reference is to the described resistive heating portion 102 configured into a flat profile to be included as a layer as a part of the second consumable article 300. It will be appreciated that the resistive heating layer 401 is simply a more specific (in terms of shape / profile) example of the described resistive heating portion 102. The same applies of references to the aerosol precursor material layer, which will be understood to be a layer of the described aerosol precursor material 104.

[0097] Advantageously, the different layers / materials are arranged along the thickness direction of the second consumable article 300. A layered structure is therefore provided in which each layer can have a large surface area contacting the adjacent layers. A thickness of the consumable article can be varied according to the number and thickness of individual layers. For example, due to flat profile comprising layers, the second consumable article 300 provides a large surface area for heat exchange between the resistive heating layer 401 and the aerosol precursor material 104 layer.

[0098] In the examples of Figures 3 and 4, there are shown two aerosol precursor material 104 layers. Each of the aerosol precursor material 104 layers occupy a different respective portion of the thickness T of the second consumable article 300. In the examples of Figures 3 and 4, the described aerosol precursor material occupying the second portion 406 is a first aerosol precursor material layer 408, and there is a second aerosol precursor material layer 410 occupying a third portion 412 of the thickness T of the second consumable article 300. The second aerosol precursor material layer 410 is on the opposite side of the resistive heating portion 102 to the first aerosol precursor material layer 408. In this manner, heat directed to opposite sides of the resistive heating portion 102 may be utilised in order to heat the aerosol precursor material 104. For example, the surface area over which heat may be transferred from the resistive heating layer 401 to the aerosol precursor material is further increased by providing aerosol precursor material 104 (as the first and second aerosol precursor material layers 408, 410) on two sides of the resistive heating layer 401 .

[0099] For example, by providing the aerosol precursor material 104 in layers 408, 410 on opposite sides of the resistive heating layer 401 (with a flat profile) a large total surface area for heat exchange is provided. Advantageously, this may provide efficient heating of the aerosol precursor material 104. In addition, providing such a large total surface area for heat exchange may provide the advantage of avoiding or inhibiting local heating to a relatively higher temperature for specific regions of the aerosol precursor material 104. In other words, this described geometry may advantageously provide more even heat distribution for heating the aerosol precursor material 104. However, in some other examples, the second consumable article 300 may have just one aerosol precursor material layer. In examples of the second consumable article 300 (which has a flat profile), there may be provided at least one aerosol precursor material 104 layer. Accordingly, any number of layers of the aerosol precursor material 104 in different respective portions of the thickness T may be provided.

[0100] As described, in examples of the disclosed consumable article, the heat transfer layer 106 is provided between the aerosol precursor material 104 and the resistive heating portion 102. In the examples of the second consumable article 300, the heat transfer layer 106 occupies a fourth portion 414 of the thickness T of the second consumable article 300. The fourth portion 414 is a portion in between the first portion 404 and the second portion 406.

[0101] As described, in these examples, there is also a second aerosol precursor material layer 410 occupying the third portion 412. In these examples, the heat transfer layer 106 also occupies a fifth portion 416 of the thickness T which is in between the first portion 404 and the third portion 412 of the thickness T. In this way, the heat transfer layer 106 is present between the resistive heating portion 102 and each of the aerosol precursor material layers 408, 410. In these examples, the resistive heating portion 102 is concealed from the aerosol precursor material 104 by the heat transfer layer 106. In these examples, a single heat transfer layer 106 is described occupying both the fourth portion 414 and the fifth portion 416 because the heat transfer layer 106 forms one layer present in two different portions, as described in further detail below. However, the second consumable article 300 may be provided with a plurality of heat transfer layers. For example, heat transfer layers may be provided at all regions that are between adjacent resistive heating layers and aerosol precursor material layers.

[0102] In some examples where the second consumable article 300 comprises a single resistive heating layer 401 and a single aerosol precursor material layer, the heat transfer layer 106 may only occupy a single portion of the thickness T therebetween.

[0103] The second consumable article 300 may also comprise the mouthpiece 212. It will be appreciated that the mouthpiece 212 of the second consumable article 300 is appropriately shaped given the flat profile of the second consumable article 300, and may therefore be differently configured to the mouthpiece 212 when included as part of the first consumable article 200 (with a cylindrical body).

[0104] In examples of the second consumable article 300, the mouthpiece 212 is aligned with the resistive heating layer and the aerosol precursor material layer along a longitudinal axis of the second consumable article 300. The longitudinal axis of the second consumable article 300 may be referred to as the second longitudinal axis and is perpendicular to the thickness T of the second consumable article 300. In Figures 3 and 4, the second longitudinal axis is indicated by the numeral 302.

[0105] For example, the second longitudinal axis 302 is along the direction in which the user may draw aerosol from the second consumable article 300. For example, the second longitudinal axis extends between the downstream and upstream ends of the second consumable article 300.

[0106] For example, the mouthpiece 212 occupies the first portion 404 of the thickness T and the second portion 406 of the thickness T. For example, the mouthpiece may occupy the entire thickness T of the second consumable article 300. In the examples of Figures 3 and 4, the mouthpiece occupies the first, second, third, fourth and fifth portions 404, 406, 412, 414, 416 of the second consumable article 300. In these examples, the heat transfer layer 106 is configured to form a barrier between the resistive heating layer 401 and the mouthpiece 212 such that the resistive heating layer 401 is concealed from the mouthpiece 212.

[0107] For example, the heat transfer layer 106 covers up the surface of the resistive heating layer 401 which faces the mouthpiece 212 (and which would otherwise directly face the mouthpiece if not for the presence of the heat transfer layer 106 therebetween). In these examples, a surface of the resistive heating layer 401 which is perpendicular to the second longitudinal axis 302 faces the mouthpiece 212.

[0108] As previously described, a single heat transfer layer 106 is referred to as occupying both the fourth portion 414 and the fifth portion 416 in the context of the examples of Figures 3 and 4. In these examples, the heat transfer layer 106 is formed to cover each of the two surfaces of the resistive heating layer 401 facing the aerosol precursor material 104 and the surface facing the mouthpiece 212. However, in other examples, discrete or separate heat transfer layers may be provided. It will be appreciated that the function of the portion of the heat transfer layer 106 between the resistive heating layer 401 and the mouthpiece 212 is to form the barrier for fluid flow rather than to transfer heat. In these examples, there is only a relatively small surface area of the resistive heating layer 401 which faces the mouthpiece. That is because, the surface area of the resistive heating layer 401 which faces the mouthpiece only forms part of the thickness T, which is the smallest of the spatial dimensions of the second consumable article 300.

[0109] As previously described, the heat transfer layer 106 forming a barrier to fluid flow between the resistive heating portion 102 and the aerosol precursor material 104 provides the advantage that the undesired particles are inhibited from flowing into the aerosol precursor material and / or mixing with the aerosol to be inhaled. For example, the barrier between the resistive heating layer 401 and the mouthpiece 212 inhibits undesired particles from flowing in the direction of the aerosol and through the mouthpiece 212 when the user draws on the mouthpiece 212. Similarly, the heat transfer layer 106 forming a barrier between the resistive heating layer 401 and the mouthpiece 212 in these examples also provides the advantage that the undesired particles are inhibited from flowing into the aerosol precursor material and / or mixing with the aerosol to be inhaled. In the configuration of Figures 3 and 4 (the flat profile second consumable article 300), a barrier is formed not only between the resistive heating portion 102 and the aerosol precursor material 104, but also between the resistive heating portion 102 and the mouthpiece 212 (which may be a filter, as previously described).

[0110] In the examples of Figures 3 and 4, there is aerosol precursor material present towards the distal end of the second consumable article 300. In these examples, air may flow into the aerosol precursor material 104 at the distal end of the second consumable article 300. In some examples, air may flow into the aerosol precursor material 104 at positions other than at the distal end of the aerosol precursor material 104. For example, where there is a covering on the aerosol precursor material 104, openings 209 may be provided to facilitate air flow into the aerosol precursor material 104. The openings 209 may be of any shape, location, arrangement and number depending on the desired amount of airflow into the aerosol precursor material 104. In the examples of Figure 3 and 4, the openings 209 are of a circular shape and are provided on the surfaces of the aerosol precursor material layers 408, 410 corresponding to their thickness. However, in other examples, the openings may be provided on surfaces defined by the length and width of the aerosol precursor material layers 408, 410.

[0111] In some examples, there is be provided an aerosol generation system comprising the consumable article 100 according to any of the described examples. The aerosol generation system also comprises an aerosol generation device configured to receive the consumable article. In examples, the aerosol generation device comprises a set of electrodes configured to make electrical contact with the consumable article, when the consumable article is received in the aerosol generation device. The set of electrodes are configured to supply an electrical current to the consumable article.

[0112] More specifically, at least some of the set of electrodes are configured to supply an electrical current to the resistive heating portion 102 of the consumable article 100. In some examples, all of the set of electrodes are configured to supply an electrical current to the resistive heating portion 102. In other examples, some of the set of electrodes are configured to provide an electric current to other portions of the consumable article, as described further below.

[0113] As referred to herein, the “electrodes” are simply conductive portion capable of conducting electricity.

[0114] Figure 5 is a simplified schematic sketch of the aerosol generation system 500, according to examples. In these examples, there is provided the aerosol generation device 502 comprising the set 504 of electrodes. For example, the set 504 of electrodes is electrically connected to an electrical power supply 505. For example, electrical power may flow (e.g., a current may flow) when the circuit is completed by creating an electrical path between two of the set 504 of electrodes, for example. In these examples, the resistive heating portion 102 may complete the electrical path when the consumable article 100 is inserted.

[0115] It should be noted that Figure 5 is a simplified depiction and no particular spatial arrangement, shape or the like should be construed from Figure 5. Particular example arrangements, shapes and the like for the set 504 of electrodes are described in greater detail further below. In the examples of Figure 5, the aerosol generation device 502 (hereafter the device 502) comprises a consumable receiving region 506 where the consumable article 100 is received. For example, the consumable article 100 may be inserted into the consumable receiving region 506 by a user. In these examples, the set 504 of electrodes is provided in the consumable receiving region 506 and physically arranged so that the electrodes come into electrical contact with the consumable article 100 when the consumable article 100 is inserted in the consumable receiving region 506.

[0116] In the examples of Figure 5, the consumable article 100 is shown as entirely within the device 502 (in other words, without a part of the consumable article 100 extending out of the device 502). However, at least in some examples, a part of the consumable article 100 extends out from the device 502 when the consumable article 100 is received in the receiving region 506.

[0117] In these examples, the set 504 of electrodes comprises a first electrode 504a and a second electrode 504b. In some examples, there may be more than two electrodes.

[0118] Advantageously, there is provided a system 500 in which heat is resistively generated without combustion and the heat is transferred through a non-combustible heat transfer layer 102 to the aerosol precursor material 104. The set 504 of electrodes provides electrical power to cause current to flow in the resistive heating portion 102 to generate heat, which is then supplied to the aerosol precursor material 104 as described. The user can conveniently insert the consumable article 100 into the device 502 to supply electrical power to the resistive heating portion 102 of the consumable article 100. For example, the device 502 and the consumable article 100 are used as a system for providing aerosol for inhalation without requiring combustion of the aerosol precursor material. The system 500 helps to realize the advantages described in relation to the consumable article 100.

[0119] In some examples, the set 504 of electrodes, comprises two or more electrically conductive rings. In these examples of the system 500, the specific version of the consumable article 100 is the first consumable article 200 having a cylindrical body. Figure 6 is a schematic internal view showing a first aerosol generation device 602, according to examples. The first aerosol generation device 602 (hereafter first device 602) is a more specific example of the described device 502. In these examples, the set of electrodes comprises a first electrically conductive ring 604 and a second electrically conductive ring 606.

[0120] For example, the first and second electrically conductive rings have an elliptical profile (e.g., circular) according to the type of cylindrical profile of the first consumable article 200 with which the first device 602 is configured to be used. As described previously, the first consumable article 200 may have various different cylindrical profiles. In these examples, the first and second electrically conductive rings 604, 606 have an internal diameter which is slightly larger than the diameter of the first consumable article 200 so that the cylindrical body 202 of the first consumable article 200 can be inserted into the first and second electrically conductive rings 604, 606. In these examples, when inserted, the first consumable article 200 is centrally aligned in the electrically conductive rings 604, 606 such that the first longitudinal axis 204 of the first consumable article 200 is centrally aligned within each of the first and second electrically conductive rings 604, 606.

[0121] However, the internal diameter of the first and second electrically conductive rings 604, 606 is small enough to provide a close fit with the first consumable article 200. The close fit is such that the desired electrical contact between the first and second electrically conductive rings 604, 606 and the first consumable article 200 is provided.

[0122] In these examples, the electrically conductive rings 604, 606 electrically contact the resistive heating portion 102. In these examples, the first electrically conductive ring 604 electrically contacts a region of the resistive heating portion 102 which is closer to the proximal end than the distal end of the first consumable article 200. In these examples, the second electrically conductive ring 606 electrically contacts a region of the resistive heating portion 102 which is closer to the distal end than the proximal end of the first consumable article 200.

[0123] In these examples, the cylindrical body 202 of the first consumable article 200 can easily be inserted into the first device 200 in a manner that provide the desired electrical connection. For example, it is not required to perform additional actions after insertion of the first consumable article 200 in order to initiate the electrical connection between the first device 602 and the first consumable article 200. The ring profile of the electrically conductive rings 604, 606 also provides for a relatively larger electrical contact surface area. For example, in the regions where the electrical contact is made, the electrical contact is present around the entire circumferent of the first consumable article 200.

[0124] The provision of the conductive rings 604, 606 also helps to align the first consumable article 200 when being inserted.

[0125] In some examples, the consumable article is the first consumable article 200 with a cylindrical body, and the set 504 of electrodes comprises two or more electrically conductive curved portions, wherein the curved portions are curved in correspondence with a curvature of the cylindrical body.

[0126] For example, instead of the described electrically conductive rings 604, 606 which form closed loops, the set 504 of electrodes may comprise curved portions which do not form a closed loop. For example, the curved portions resemble arcs in cross section when viewed from a direction parallel to the first longitudinal axis 204 (when the first consumable article 200 is received in the first device 602).

[0127] Figure 7 is a schematic top-down view of a second aerosol generation device 702 (hereafter second device 702), according to examples. The second device 702 is a more specific example of the described device 502. In these examples, the set of electrodes comprises a first conductive curved portion 704 and a second conductive curved portion 706. In Figure 7, there is also shown an example of the first consumable article 200 received in the second device 702. In Figure 7, the first longitudinal axis 204 is represented by a cross inside a circle (representing the tail of an arrow) which indicated a direction going into the page. Herein, reference is made to feature of the second device 702 (and other examples of the device 502) relative to the first longitudinal axis 204. It will be appreciated that the described shapes, positions, orientation, etc. of features of the device described relative to the first longitudinal axis 204 are in the case where the first consumable article 200 is received in the said device.

[0128] For example, the first and second conductive curved portions 704, 706 are physically arranged such that they make electrical contact with the first consumable article 200 when the first consumable article 200 is received in the second device 702. For example, the first and second conductive curved portions 704, 706 make electrical contact with the resistive heating portion 102. Each of the first and second electrically conductive curved portions 704, 706 extend in the direction of the first longitudinal axis 204. In some examples, the first and second electrically conductive curved portions 704, 706 are aligned with each other such that they extend along the same portion of the first longitudinal axis 204. In some examples, the first electrically conductive curved portion 704 extends along a first portion of the first longitudinal axis 204, and the second electrically conductive curved portion 706 extends along a second portion of the first longitudinal axis 204. In some examples, the first and second portions of the first longitudinal axis 204 overlap such that there is a region along the first longitudinal axis 204 at which a cross-section taken perpendicular to the first longitudinal axis 204 comprises both the first and second electrically conductive curved portions 704, 706. In some examples, the first and second electrically conductive curved portions 704, 706 do not overlap in this manner, and there is a separation along the first longitudinal axis between the first and second electrically conductive curved portions 704, 706. Figure 8 is a schematic front view of an electrically conductive curved portion, according to examples. In Figure 8, the orientation of the first longitudinal axis 204 is indicated for reference, as the orientation would be when the first consumable article 200 is received in the second device 702.

[0129] As described, the curved portions 704, 706 are curved in correspondence with a curvature of the cylindrical body 202. Such curved portions advantageously provide a relatively large electrical contact area with the resistive heating portion 102.

[0130] In some examples, the set 504 of electrodes comprises two or more elongate conductive portions. For example, there may be provided a version of the device 502 in which the set 504 of electrodes is configured for use with the second consumable article 300 with a flat profile.

[0131] Figure 9 is a schematic internal view of a third aerosol generation device 902 (hereafter the third device 902), according to examples. The third device 902 is a more specific example of the described device 502. In these examples, the set of electrodes comprises a first elongate conductive portion 904 and a second elongate conductive portion 904.

[0132] It will be appreciated that in the described examples of the second consumable article 300, there may be three sides of the resistive heating layer 401 which are not in contact with the heat transfer layer 106. For example, as described, one of the sides of the resistive heating layer 106 parallel to the thickness T direction and facing the mouthpiece 212 is covered by the heater transfer layer 106 in some examples. However, the remaining three sides parallel to the thickness T direction may be exposed.

[0133] For example, the first and second elongate conductive portions 904, 906 are configured to electrically contact two of the exposed sides of the resistive heating layer 401 , when the second consumable article 300 is received in the third device 902. Accordingly, electrical power may be supplied to the resistive heating layer 401 of the second consumable article 300.

[0134] Various specific examples are described above which comprise a pair of conductive portions of different configuration (for example, according to the type of consumable article with which use is intended). However, in any of the described examples of the device, there may be provided more than two conductive portions as part of the set 504 of electrodes.

[0135] In some examples, the set 504 of electrodes comprises a subset of electrodes configured to supply an electrical current to the aerosol precursor material 104. For example, the subset of electrodes is arranged and / or positioned such that the subset makes electrical contact with the aerosol precursor material 104 when the consumable article is received in the device. The subset may be provided in any of the described examples of the device 502. For example, in the first device 602, there may be provided an additional two conductive rings positioned to make electrical contact with the aerosol precursor material 104 of the first consumable article 200 when it is received in the first device 602. For example, in the second device 702, there may be provided an additional two conductive curved portions positioned to make electrical contact with the aerosol precursor material 104 of the first consumable article 200 when it is received in the second device 702. For example, in the third device 902, there may be provided an additional two conductive portions positioned to make electrical contact with one of the aerosol precursor material layers of the second consumable article 300.

[0136] In some examples, a different number (e.g., different to the specific examples described such as four) of electrodes may be provided. As an example, the third device 902 may comprise a pair of electrodes (e.g., elongate conductive portions) for supplying an electrical current to the resistive heating layer 401 , and one or more other pairs of electrodes for supplying respective aerosol precursor material layers (depending on the number of aerosol precursor material layer in the example of the second consumable 300 intended to be used with the third device 902).

[0137] As previously described, in some examples, the aerosol precursor material 104 comprises one or more electrical conductors. In such examples, heat can be generated directly within the conductive aerosol precursor material by causing a current to flow therein.

[0138] The subset of electrodes may supply electrical power to the conductive aerosol precursor material 104 to cause heat to be generated directly within the aerosol precursor material. For example, the subset of electrodes may be controlled according to an amount of heat it is desired to generate directly within the aerosol precursor material 104. In some examples, the subset of electrodes are controlled independently to the remainder of the set 504 of electrodes such that different electrical power can be delivered to the aerosol precursor material 104. For example, it may be desired to cause a smaller increase in temperature of the aerosol precursor material 104 as compared to the desired increase in temperature of the resistive heating portion 102.

[0139] The provision of the subset of electrodes for supplying electrical power to the aerosol precursor material 104 provides greater control over the manner in which the aerosol precursor material 104 is heated. For example, by generating heat directly within the aerosol precursor material 104, a temperature gradient between a surface of the aerosol precursor material 104 receiving heat generated by the resistive heating portion 102 and an opposite surface may be reduced. In other words, by generating heat directly within the aerosol precursor material 104 itself and not just relying on the heat from the resistive heating portion 102, a more even temperature distribution within the aerosol precursor material 104 may be achieved.

[0140] For example, generating heat directly within the aerosol precursor material 104 may also reduce the burden on the resistive heating portion 102 to generate the required amount of heat. Less heat may therefore need to be transferred to the aerosol precursor material 104 via the heat transfer layer 106. Advantageously, the resistive heating portion 102 may be operated at a lower temperature, thereby potentially reducing release of undesired particles from the resistive heating portion 102. While examples of the device comprising the described subset of electrodes (configured to supply electrical current to the aerosol precursor material 104) may produce these advantages when used with a consumable article where the aerosol precursor material is conductive, such example devices may also be used with consumable articles without electrically conductive aerosol precursor material. In such examples, electrical current may simply not be attempted to be delivered to the aerosol precursor material 104. For example, the supply of current by the device may be controlled according to whether or not the aerosol precursor material 104 is conductive.

[0141] In some examples, the device 502 according to any of the described examples comprises circuitry and / or a microcontroller for controlling the manner in which electrical power is supplied via the set 504 of electrodes. The supply of electrical power may be controlled based on the specific consumable article being used, the type of aerosol precursor material (e.g., based on the component of the aerosol precursor material and / or whether it is electrically conductive), a desired length of an inhalation session, a desired characteristic of the aerosol (e.g., as indicated by the user), and the like. Those skilled in the art will appreciate that various different heating profiles in the sense of how temperature changes over a period of time can be used depending on the desired aerosol, device and consumable features. The described manner of heating using electrical power provides significant control over how heat is delivered to the aerosol precursor material.

[0142] It is important to note that the various features described above may be used in various combinations. Although preferred embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes and modifications might be made without departing from the scope of the invention, as defined in the appended claims and as described above.

Claims

CLAIMS1. A consumable article (100, 200, 300) comprising: a resistive heating portion (102) configured to generate heat via resistive heating when an electrical current is passed through the resistive heating portion (102); an aerosol precursor material (104); and a non-combustible heat transfer layer (106) between the resistive heating portion (102) and the aerosol precursor material (104) configured to transfer heat between the resistive heating portion (102) and the aerosol precursor material (104).

2. The consumable article (100, 200, 300) according to claim 1 , wherein: the non-combustible heat transfer layer (106) is configured to form a barrier to the flow of a fluid between the resistive heating portion (102) and the aerosol precursor material (104) such that the resistive heating portion (102) is concealed from the aerosol precursor material (104).

3. The consumable article (100, 200, 300) according to claim 1 or claim 2, wherein: the non-combustible heat transfer layer (106) comprises metal.

4. The consumable article (100, 200, 300) according to any one of the preceding claims, wherein: the resistive heating portion (102) comprises an organic conductive material.

5. The consumable article (100, 200, 300) according to any one of the preceding claims, wherein: one or more surface regions of the resistive heating portion (102) are exposed to form electrical contacts accessible to electrodes or connectors of an outer power source.

6. The consumable article (100, 200, 300) according to any one of the preceding claims, wherein:the aerosol precursor material (104) comprises one or more electrical conductors configured to conduct electrical current through the aerosol precursor material (104).

7. The consumable article (100, 300) according to any of the preceding claims, wherein: the consumable article (100, 300) has a flat profile such that a thickness of the consumable article (100, 300) is smaller than 20% of any one of the remaining two spatial dimensions of the consumable article (100, 300).

8. The consumable article (100, 300) according to claim 7, wherein: the resistive heating portion (102) is in the form of a resistive heating layer (401) occupying a first portion (404) of the thickness of the consumable article (100, 300); the aerosol precursor material (104) is in the form of an aerosol precursor material layer (408) occupying a second portion (406) of the thickness of the consumable article (100, 300), the second portion (406) being different to the first portion (404).

9. The consumable article (100, 300) according to claim 8, comprising: a mouthpiece (212) aligned with the resistive heating layer (401) and the aerosol precursor material layer (408) along a longitudinal axis (302), the longitudinal axis (302) of the consumable article (100, 300) being perpendicular to the thickness, the mouthpiece (212) occupying the first portion (404) of the thickness and the second portion (406) of the thickness, wherein: the non-combustible heat transfer layer (401) is configured to form a barrier to the flow of a fluid between the resistive heating layer (401) and the mouthpiece (212) such that the resistive heating layer (401) is concealed from the mouthpiece (212).

10. The consumable article (100, 200) according to any one of claims 1 to 6, wherein: the consumable article is in the form of a cylindrical body (202) extending along a longitudinal axis (204); a first portion (206) of the cylindrical body (202) along the longitudinal axis (204) of the cylindrical body (202) constitutes the resistive heating portion (102);a second portion (208) of the cylindrical body (202) along the longitudinal axis (204) of the cylindrical body (202) constitutes the non-combustible heat transfer layer (106); and a third portion (210) of the cylindrical body (202) along the longitudinal axis (204) of the cylindrical body (202) constitutes the aerosol precursor material (104).

11. An aerosol generation system (500) comprising: the consumable article (100, 200, 300) according to any one of claims 1 to 10; and an aerosol generation device (502, 602, 702, 902) configured to receive the consumable article (100, 200, 300), the aerosol generation device (502, 602, 702, 902) comprising: a set (504) of electrodes configured to make electrical contact with the consumable article (100, 200, 300), when the consumable article (100, 200, 300) is received in the aerosol generation device (502, 602, 702, 902), the set (504) of electrodes configured to supply an electrical current to the consumable article (100, 200, 300).

12. The aerosol generation system (500) according to claim 11 , wherein: the set (504) of electrodes comprises two or more electrically conductive rings (604, 606).

13. The aerosol generation system (500) according to claim 11 , wherein: the consumable article (100, 200) is according to claim 10; and the set (504) of electrodes comprises two or more electrically conductive curved portions (704, 706), wherein the curved portions (704, 706) are curved in correspondence with a curvature of the cylindrical body (202).

14. The aerosol generation system according to claim 11 , wherein: the set (504) of electrodes comprises two or more elongate conductive portions (904, 906).

15. The aerosol generation system (500) according to any one of claims 11 to 14, wherein:the set (504) of electrodes comprises a subset of electrodes configured to supply an electrical current to the aerosol precursor material (104).

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