Aerosol-generating items

Abstract

Disclosed is an aerosol-generating article that includes a housing, a substrate disposed within the housing, the substrate configured to generate an aerosol when heated, and at least one heating element disposed within the housing proximate to the substrate, each heating element including a susceptor and an insulator, the insulator surrounding at least a portion of the susceptor, the susceptor and the insulator configured such that, in use, upon application of an electromagnetic field by an aerosol-generating device, the heating element heats the proximate substrate without damaging the housing of the article.

Description

[Technical field]

[0001] The present disclosure relates to aerosol generating devices and consumable articles for aerosol generating devices, and in particular to inductively heatable articles. The articles may include tobacco or other suitable aerosol substrate material that is heated, rather than combusted, to generate an aerosol for inhalation. [Background technology]

[0002] The popularity and use of risk reduction or risk modification devices (also called vaporizers) has grown rapidly in recent years as an aid to assist habitual smokers who wish to quit smoking traditional tobacco products such as cigarettes, cigars, cigarillos, rolling tobacco, etc. A variety of devices and systems are available that heat or warm an aerosolizable substance, as distinct from the burning of tobacco in traditional tobacco products.

[0003] A commonly available risk reduction or modification device is the substrate heated aerosol generator or non-combustion heated device. This type of device generates an aerosol or vapor by heating an aerosol substrate, which typically includes moist tobacco or other suitable aerosolizable material, to a temperature typically in the range of 150°C to 350°C. By heating the aerosol substrate without burning or combusting it, an aerosol is released that includes the ingredients desired by the user, but does not include the toxic and carcinogenic by-products of combustion and burning. Furthermore, the aerosols generated by heating tobacco or other aerosolizable material typically do not include the burnt or bitter taste resulting from burning and burning, which can be unpleasant to the user, and therefore the substrate does not require sugars and other additives that are typically added to such materials to make the smoke and / or vapor more palatable to the user.

[0004] One such method of heating an aerosol substrate is through an induction heating system, in which an induction coil (also called an inductor) is provided in the device, and a susceptor is provided at or near the aerosol substrate. When a user activates the device, electrical energy is supplied to the inductor, which creates an electromagnetic field. The susceptor couples with the electromagnetic field to generate heat, which is transferred to the substrate, generating an aerosol from the substrate.

[0005] However, there are various problems associated with using induction heating systems in aerosol generating systems. It is difficult to generate precise heat profiles in the area of ​​the susceptor, and as a result, the aerosol substrate cannot be easily heated quickly and efficiently without burning consumables or other areas of the aerosol generating device. Existing attempts to generate safe and efficient heat profiles cannot be easily integrated into existing high speed production machines and therefore cannot be easily manufactured.

[0006] The present invention seeks to address at least some of the above problems. Summary of the Invention [Means for solving the problem]

[0007] According to a first aspect of the present invention, there is provided an aerosol-generating article comprising a housing, a substrate disposed within the housing, the substrate configured to generate an aerosol when heated, and at least one heating element disposed within the housing adjacent to the substrate, each heating element comprising a susceptor and an insulator, the insulator surrounding at least a portion of the susceptor, the susceptor and the insulator being configured such that, in use, when an electromagnetic field is applied by an aerosol-generating device, the heating element heats the adjacent substrate without damaging the housing of the article.

[0008] The insulator is disposed between the susceptor and the housing, which allows the susceptor to be heated to a higher temperature, thereby allowing the substrate to be heated and the aerosol to be generated more quickly, without burning or otherwise damaging the housing of the article. Thus, since the insulator surrounds at least a portion of the susceptor, the susceptor of the heating element can be inductively heated to a higher temperature, without damaging the article, in particular without damaging the housing of the article. In addition to their advantages during use of the article, the susceptor and insulator thus forming separate, at least partially insulated heating elements are particularly advantageous in manufacturing aerosol-generating articles including these heating elements. Heating elements configured in this way can be simply integrated into existing manufacturing processes for aerosol-generating articles, which advantageously include high-speed processes such as linear bonding processes, thereby further saving manufacturing costs.

[0009] Preferably, the insulator is a solid component of the insulator material. Thus, in addition to providing the above-mentioned advantages, the insulator increases the strength of the article, in particular the structural strength of the article. The insulator material must also be resistant to burning or heating damage at the normal operating temperatures of the aerosol generating device. Solid insulator materials may include ceramics such as aluminum oxide or silicon dioxide, or calcium oxide or PEEK.

[0010] Preferably, the insulator is in direct contact with the susceptor. More preferably, the insulator is in direct contact with the susceptor and the insulator surrounds the susceptor. This configuration further enhances both the strength of the article and its insulating effectiveness, while at the same time allowing for straightforward integration into the manufacturing process of aerosol-generating articles.

[0011] Preferably, the article is elongated in shape with an article axis defined between two longitudinally opposed ends of the article.

[0012] Preferably, the susceptor includes a first end and a second end, and the heating element is disposed within the housing such that the first end and the second end are axially aligned along the article axis.

[0013] In this manner, the heating element can be easily incorporated into the article during the manufacturing process. Furthermore, because the first and second ends of the susceptor are aligned with the article axis, they are located away from the article housing, making it less likely that heating will damage the housing.

[0014] Optionally, the insulator surrounds the susceptor such that the first and second ends of the susceptor are exposed from the insulator. Optionally, the insulator surrounds all but the opposing ends of the susceptor, and the first and second ends of the susceptor are not covered by the insulator. The first and second ends of the susceptor do not need to be covered by the insulator because they are less likely to damage the housing. In this manner, less insulator material is used in the heating element, thereby saving costs and reducing the volume occupied by the heating element.

[0015] Optionally, the insulator completely encapsulates the susceptor, i.e., the insulator completely surrounds the outer surface of the susceptor, thus providing maximum thermal protection for the housing of the article while still allowing the heating element to heat the substrate.

[0016] Optionally, the susceptor is in the shape of a cylindrical tube. This cylindrical shape matches the shape of a typical aerosol-generating article, allowing easy incorporation of the heating element into such an article and allowing uniform heating of the substrate. Furthermore, the tube shape allows the continuous flow of inductively generated eddy currents while reducing the amount of susceptor material that is not resistively heated by eddy currents flowing near the surface, thereby increasing the rate at which the susceptor heats up to the desired temperature when an electromagnetic field is applied.

[0017] Preferably, the tube wall thickness is between 50 μm and 150 μm, which has been found to provide a desirable balance between optimal heating profile and ease of manufacturability.

[0018] Optionally, the susceptor is flat plate shaped. Optionally, the susceptor is hollow cubic shaped. Optionally, the susceptor comprises a plurality of strands of susceptor material. Preferably, a minimum thickness of a portion of the susceptor is between 50 μm and 150 μm.

[0019] Optionally, the insulator is generally the same shape as the susceptor. For example, if the susceptor is cylindrical, the insulator may also be cylindrical, particularly a larger cylinder, to surround at least a portion of the susceptor. If the insulator is generally the same shape as the susceptor, the length of the insulator (e.g., along the longitudinal axis of the heating element) is substantially greater than or equal to the length of the susceptor (typically measured along the same axis).

[0020] Optionally, the insulator includes a plurality of protrusions of insulator material extending from the heating element. In this manner, the protrusions increase the efficiency of heat dissipation from the susceptor away from the housing by increasing the volume to surface area ratio of the insulator. The protrusions may be arranged to define channels or gaps (e.g., between adjacent protrusions) for air to flow within the article.

[0021] Preferably, the plurality of protrusions extend from the heating element perpendicular to a longitudinal axis of the article, which, if the article is elongated, is the article axis as mentioned above.

[0022] Preferably, the outer diameter of the heating element is approximately equal to the inner diameter of the housing, i.e., the insulator surrounds at least a portion of the susceptor so that the insulator is in direct contact with the inside of the housing, thus making it easier to manufacture an article that uniformly heats a substrate.

[0023] Preferably, the outer diameter of the heating element is between 5 mm and 8 mm.

[0024] Preferably, the length of the heating element is 6 mm or more. In this way, the heating element may be easier to manufacture and incorporate into existing aerosol-generating article manufacturing processes than a shorter heating element, while still providing space within the article for efficient substrate heating. The length of the heating element is measured from a first end of the heating element to a second end of the heating element, and when the heating element is placed within the article, the first end and the second end of the heating element are axially aligned with the longitudinal axis of the article. Optionally, the length of the heating element is 6 mm or more and less than 8 mm, for more efficient heating of substrates near the heating element.

[0025] Preferably, the at least one heating element comprises a plurality of heating elements, in this manner allowing portions of the substrate within the article to be heated more uniformly and efficiently.

[0026] Preferably, the heating elements are axially aligned with the longitudinal axis of the article and arranged sequentially along the length of the article, with the substrate being disposed between adjacent heating elements. In this manner, portions of the substrate are sequentially separated by heating elements such that portions of the substrate alternate with heating elements along the length of the article. This provides efficient and uniform heating of the substrate. If the article is elongated, this longitudinal axis of the article is the article axis as described above.

[0027] According to a second aspect of the present invention there is provided an aerosol generating system comprising an aerosol generating article of the first aspect and an aerosol generating apparatus comprising a heating chamber and at least one induction coil, the apparatus being configured, in use, to receive the article in the heating chamber such that the induction coil is aligned with the susceptor.

[0028] In this manner, when an article is contained within the apparatus and a user operates the apparatus, the induction coil generates a time-varying, alternating electromagnetic field that couples with the article's susceptor, causing the susceptor to heat and heat the adjacent substrate. The apparatus may include a single induction coil configured to extend along at least a majority of the length of the heating chamber, or alternatively, may include multiple induction coils, each positioned to align with at least one susceptor of the contained article.

[0029] In the following, embodiments of the present invention will be described with reference to the accompanying drawings, in which: [Brief description of the drawings]

[0030] [Figure 1] 1 is a schematic cross-sectional view of an aerosol-generating article according to the present invention. [Diagram 2] FIG. 1 is a schematic cross-sectional view of an aerosol generating system according to the present invention, including an aerosol generating device and an aerosol-generating article, showing the aerosol-generating article being introduced into the aerosol generating device. [Diagram 3] FIG. 3A is a schematic diagram of a heating element of an aerosol-generating article according to the present invention, and FIG. 3B is a schematic cross-sectional view of the heating element. [Figure 4] 4A-4D are schematic diagrams of a susceptor of an aerosol-generating article according to the present invention. [Diagram 5] FIG. 5A is a schematic diagram of insulation for an aerosol-generating article according to the present invention, and FIGS. 5B and 5C are schematic cross-sectional views of insulation for aerosol-generating articles according to the present invention. [Figure 6] 6A and 6B are schematic diagrams of an aerosol-generating article according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] As described herein, a vapor is generally understood to refer to a substance that is in the gas phase below its critical temperature, meaning that the vapor can be condensed into a liquid by increasing the pressure without decreasing the temperature, whereas an aerosol is fine solid particles or liquid droplets suspended in air or another gas. However, it should be noted that the terms "aerosol" and "vapor" may be used interchangeably herein, particularly with respect to the form of inhalable medium that is generated for inhalation by a user.

[0032] FIG. 1 is a schematic cross-sectional view of an aerosol-generating article 1 (article) according to the present invention.

[0033] In Figure 1, the aerosol-generating article 1 includes a housing 10 (e.g., a paper wrapper) that houses the various components of the article 1. In the illustrated embodiment, the article 1 is elongated in shape with an article axis 2 defined by the article 1 between two longitudinally opposed ends of the article 1. Although the preferred shape of the article 1 is an elongated cylindrical shape, as will be appreciated by those skilled in the art, the article 1 may be formed in any shape sized to fit the components described in the various embodiments herein and to allow the article 1 to be housed in a corresponding aerosol generating device 100. For example, the article 1 may be cubical in shape.

[0034] The aerosol-generating article 1 includes an aerosol substrate 20 (substrate), such as tobacco, disposed within a housing 10. The article also includes a number of heating elements 4 arranged within the housing 10 and proximate to the substrate 20. The heating elements 4 are configured, in use, to heat, without combusting, the substrate 20 to form an aerosol for inhalation by a user.

[0035] Although the heating element 4 shown in Figures 1, 3A, 3B, 6A, and 6B is shaped as a substantially short cylinder, other sizes and shapes may be used to change the characteristics of the heating element 4 to tailor the heating effect achieved, and therefore the aerosol generated. Similarly, the number and arrangement of the heating elements 4 within the article 1 may be adapted to tailor the aerosol generated. For example, the article 1 may include only one heating element 4 shaped to extend along a relatively large portion of the article 1, in order to heat the substrate evenly in that way. Smaller sized articles 1 typically do not include as many substrates 20 as larger articles, and therefore are expected to use as many heating elements 4 as are necessary to generate the desired aerosol. Furthermore, the use of a large number of relatively small sized heating elements 4 evenly spaced throughout the article 1 may provide a more uniform heat distribution than a smaller number of relatively large sized heating elements 4, but the article 1 using such large heating elements is easier to manufacture.

[0036] Each heating element 4 includes a susceptor 30 and an insulator 40, with the insulator 40 surrounding at least a portion of the susceptor 30 such that at least a portion of each heating element 4 is an insulated heating element 4. The susceptor 30 is an electrical conductor and includes a susceptor material such as mild steel, stainless steel, aluminum, iron, etc. The insulator 40 is an insulator and thus prevents the heating element 4 from overheating during use and damaging the housing 10. The insulator 40 includes an insulating material, preferably a ceramic such as aluminum oxide or silicon dioxide, with other insulating materials being calcium oxide and PEEK. The insulator 40 may completely surround and encapsulate the susceptor 30 or may surround only a portion of the susceptor 30. In the example of FIG. 1, shown in more detail in FIGS. 3A and 3B, the susceptor 30 is a cylindrical tube with only the outer surface of the tube covered with the insulator 40, while the ends 31, 32 of the susceptor 30 are cut and exposed of the insulator 40 so that the insulator 40 forms another, larger cylindrical tube surrounding the susceptor 30. Preferably, the heating element 4 is positioned within the article 1 such that the first end 31 of the susceptor 30 and the second end 32 of the susceptor are axially aligned along the article axis 2 to provide more uniform heating. Preferably, if only a portion of the susceptor 30 is surrounded by the insulator 40, the heating element 4 is positioned such that the insulator 40 is closer to the housing 10 than the susceptor 30. That is, the side of the susceptor 30 closest to the housing 10 is the side surrounded by the insulator 40.

[0037] During use, an electromagnetic field is applied to the susceptor 30, which generates eddy currents and / or magnetic hysteresis losses within the susceptor 30, causing the susceptor 30 to heat up. This heat is then transferred (e.g., by conduction, convection, or radiation) from the susceptor 30 to the substrate 20, which heats the substrate 20 and generates an aerosol for inhalation. During this process, the insulating properties of the insulator 40 prevent excess heat from being transferred (e.g., conducted) to the housing 10 of the article 1.

[0038] The article 1 further includes a filter 3 at an end of the article 1 that alters the characteristics of the generated aerosol to enhance the user experience. In the illustrated article 1, the filter 3 also acts as a mouthpiece through which the user can directly inhale the generated aerosol, but in other examples of the article 1, the mouthpiece and the filter 3 are separate elements. Additionally, in still other examples, the article 1 may include the filter 3 and not the mouthpiece, or may include the mouthpiece and not the filter 3, or may include neither the filter 3 nor the mouthpiece. These elements may still be provided separately from the article 1 when used in an aerosol generating system used with the article 1, for example, the mouthpiece may be included in the aerosol generating device 100.

[0039] The aerosol-generating article 1 is configured to be coupled to an aerosol-generating device 100. Figure 2 shows an example of an aerosol-generating system including the aerosol-generating article 1 and the aerosol-generating device 100, with the article 1 being introduced into a heating chamber 110 of the device 100. The heating chamber 110 defines an interior space that is approximately the same shape as the article 1 that the device is configured to accommodate, ensuring a good fit between these components. For example, if the article 1 is an elongated cylindrical shape, then the interior space of the heating chamber 110 should also be an elongated cylindrical shape with approximately the same diameter as the article 1 (or slightly larger than the article 1).

[0040] The apparatus 100 also includes a number of induction coils 120 arranged around the heating chamber 110 and acting as electromagnetic field generators. In use, a high frequency alternating current is applied to the coils 120, causing a time-varying, alternating electromagnetic field to emanate from the coils 120 which couples with a susceptor 30 of an article 1 contained within the heating chamber 110, causing the susceptor 30 to heat up as described above.

[0041] In the example apparatus 100 shown in Figure 2, the apparatus 100 includes multiple individual coils 120 sized and positioned to align with the susceptor 30 of the contained article 1. This results in efficient use of energy and power, as the size of the electromagnetic field generated by the coils is limited while still providing the necessary heating. However, this is not required, and in other example apparatus 100, a single coil 120 (or multiple larger coils 120) may extend along a larger portion of the heating chamber 110, allowing the same apparatus 100 to generate an electromagnetic field that is effective when used in combination with a variety of articles 1 having heating elements 4 of various configurations.

[0042] The heating element 4, susceptor 30, and insulator 40 may be of various configurations. Preferably, the susceptor 30 is thin, or if forming a larger feature, has a thin wall, with a thickness of 50 μm to 150 μm. It has been found that a susceptor 30 having a thickness of around 50 μm provides optimal heating in combination with an electromagnetic field alternating at a frequency of around 300 kHz to 500 kHz. Such a thin susceptor 30 is effective due to the skin effect, where a high percentage of the generated eddy currents are found near the susceptor 30's most surface. A thicker susceptor 30, or even a susceptor 30 with a thicker wall, will heat the substrate 20 and generate aerosol, but will take longer to heat to the desired temperature. However, it has been found that some shapes of susceptors 30 (e.g., hollow structures) are difficult to manufacture with wall thicknesses of 50 μm, so these susceptors 30 may be used with thicker walls (e.g., 120 μm) to balance heating characteristics with ease and cost of manufacture.

[0043] 4A, 4B, 4C, and 4D show several different examples 30A-D of susceptors according to the present invention. Susceptor 30A is in the shape of a hollow circular tube. This tube shape allows the generated current to flow continuously while minimizing the amount of susceptor material that is not resistively heated due to eddy currents flowing near the surface. Susceptor 30B is in the shape of a flat plate. Susceptor 30C includes multiple individual strands of susceptor material. Susceptor 30C is in the shape of a cube, which may be a hollow cube or a solid structure without cavities.

[0044] Preferably, the shape of the insulator 40 of the heating element 4 generally corresponds to the shape of the susceptor 30 or to the shape of a cross section of the article 1 perpendicular to the article axis 2. For example, Figure 5A shows a perspective view of a cylindrically shaped insulator 40 used in combination with a cylindrically shaped susceptor 30. Figure 5B shows a top view of the same insulator 40.

[0045] The insulation 40 of the heating element 4 surrounds the insulation 30, so that the dimensions of the insulation are approximately the same as the dimensions of the heating element 4. Preferably, the length of the insulation 40 (i.e., the length in the direction of the article axis 2 when fitted inside the article 1) is 6 mm or more. Preferably, the outer diameter (or outer width, depending on the shape of the insulation 40) of the insulation 40 is approximately the same as the inner diameter of the housing 10 at the location of the largest diameter. This helps ensure that the heating element 4 stays in place in the article 1 and provides uniform and efficient heating of the substrate 20 without damaging the housing 10. For example, the outer diameter of the insulation 40, and therefore the heating element 4, is 5 mm to 8 mm. In another example, the outer diameter of the susceptor 30 is 5 mm to 7 mm, and the thickness of the insulation 40 (i.e., the distance between the outer diameter of the susceptor 30 and the outer diameter of the insulation 40) is 0.1 mm to 3 mm.

[0046] In some examples of the present invention, the insulator 40 includes fin-like protrusions 41 of insulating material extending from the heating element 4. An example of such a heating element 4 is shown in FIG. 5C. The insulator protrusions 41 increase the volume to surface area ratio of the insulator 40, thereby further aiding in the dissipation of heat from the susceptor 30 (as has been done, for example, by the insulator 30) without overheating or damaging the housing 10. The protrusions 41 are configured to extend toward the housing 10 of the article 1 when properly positioned within the article 1. The insulator protrusions 41 may contact the interior of the housing 10, or may extend toward the housing 10 without contacting the housing 10. If the insulator protrusions 41 are in contact with the interior of the housing 10, they help reinforce the article 1 and reduce accidental damage to the article 1 by a user. These protrusions 41 may extend directly from the susceptor 30, or may extend from a portion of the insulator 40 that surrounds (at least a portion of) the susceptor 30. The protrusions 41 may also be used to create gaps for airflow through the article 1 to control the aerosol inhalation experience.

[0047] As will be appreciated by those skilled in the art, the heating elements 4 may be included in the article 1 in a variety of configurations. For example, FIG. 1 shows a schematic cross-sectional view of an aerosol-generating article 1 including multiple heating elements 4 in the shape of a cylindrical tube. A cavity in the hollow susceptor 30 may accommodate the substrate 20 to be heated, or alternatively, the cavity may be substantially empty, providing an air gap between portions of the substrate 20 separated by adjacent heating elements 4. In FIG. 6A, the susceptor 30 of the heating element 4 is a solid cylindrical shape without a cavity. Because aerosol cannot be drawn through the susceptor 30 and the heating elements 4 extend across both sides of the housing 10, the insulator 40 includes individual projections 41 of insulator material extending from the heating elements 4 toward the inner edge of the housing 10 to define air flow paths through the article 1. FIG. 6B shows another example in which the susceptor 30 of the heating element 4 is a solid cylindrical shape without a cavity, and the insulation 40 surrounds the outer diameter of the susceptor 30 but does not extend into the article housing 10, thereby further reducing the risk of damage to the housing 10 due to heating.

[0048] This configuration of the heating element 4 allows the heating element 4 to be manufactured separately from the aerosol-generating article 1 and easily incorporated into existing manufacturing processes for the article 1. This includes rapid manufacturing processes for the article 1, such as linear bonding processes.

[0049] The exact method of manufacturing the heating elements 4 will vary depending on their intended configuration. For example, a long tube of susceptor material may be coated or overmolded with an insulator material and then cut into individual heating elements 4, where the outer diameter of the susceptor 30 is covered with the insulator 40, but the first end 31 and second end 32 of the susceptor 30 remain uncovered and exposed. In a similar alternative, the same long tube of susceptor material is cut into individual susceptor 30 components and then coated or overmolded with an insulator material to form the heating elements 4. This technique is preferred when a heating element 4 is desired in which the insulator 40 completely encapsulates the susceptor 30.

[0050] In one example of a process for manufacturing an aerosol-generating article 1 according to the invention, the substrate 20 is fed onto a continuous web of unpackaged housings 10. If the finished article 1 is intended to include other components (e.g., filters 3 and mouthpieces), they are also fed onto the web of housings 10. After the substrate 20 is placed onto the web, the heating elements 4 are inserted onto the web of housings 10 to separate the portions of the substrate 10. Preferably, a cavity is created in the substrate 20 to define the space into which the heating elements 4 are inserted. Once all the internal components of the article 1 are placed onto the web of housings 10, they are wrapped by the web of housings 10 to ensure that the internal components are enclosed within the housing 10 to form a continuous rod. This continuous rod is cut into individual rods. In some examples, the individual rods may be the finished aerosol-generating article 1, while in other examples, the individual rods are further processed (e.g., additional packaging is applied to the filters of the individual rods, laser perforation is applied, etc.).

Claims

1. An aerosol-generating article, comprising: Housing and a substrate disposed within the housing, the substrate configured to generate an aerosol when heated; at least one heating element disposed within the housing and adjacent to the substrate; Including, Each heating element is A susceptor; an insulator, the insulator comprising a solid insulator material; Including, the insulator surrounds at least a portion of the susceptor and is in contact with the susceptor, and the susceptor and the insulator are configured such that, in use, when an electromagnetic field is applied by an aerosol generating device, the heating element heats the adjacent substrate without damaging the housing of the article. Aerosol-generating items.

2. 10. The article of claim 1, wherein the article is elongated with an article axis defined between two longitudinally opposed ends of the article.

3. 3. The article of claim 2, wherein the susceptor includes a first end and a second end, and the heating element is positioned within the housing such that the first end and the second end are axially aligned along the article axis.

4. The article of claim 3 , wherein the insulator surrounds the susceptor such that the first end and the second end of the susceptor are exposed from the insulator.

5. The article of claim 1 , wherein the insulator completely encapsulates the susceptor.

6. The article of claim 1 , wherein the susceptor is in the shape of a cylindrical tube.

7. The article of claim 6, wherein the tube wall has a thickness of from 50 μm to 150 μm.

8. The article of claim 1 , wherein the insulator is generally the same shape as the susceptor.

9. The article of claim 1 , wherein the insulator comprises a plurality of protrusions of insulating material extending from the heating element.

10. 10. The article of claim 9, wherein the plurality of protrusions extend from the heating element perpendicular to the longitudinal axis of the article.

11. The article of claim 1, wherein the heating element has an outer diameter of 5 mm to 8 mm.

12. 10. The article of claim 1, wherein the heating element has a length of 6 mm or greater.

13. The article of claim 1 , wherein the at least one heating element comprises a plurality of heating elements.

14. 14. The article of claim 13, wherein the plurality of heating elements are axially aligned with a longitudinal axis of the article and arranged sequentially along the length of the article, and the substrate is disposed between adjacent heating elements.

15. 1. An aerosol generating system comprising: An aerosol-generating article according to any one of claims 1 to 14; an aerosol generating device comprising a heating chamber and at least one induction coil; Including, the apparatus is configured, in use, to receive the article in the heating chamber such that the induction coil is aligned with the susceptor; Aerosol generation system.

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