Aerosol generating device with comb-shaped electrodes

Abstract

An aerosol generating device configured to generate an aerosol from a consumable comprising an aerosol substrate and a heating element comprising an electrically conductive material, the aerosol generating device comprising: a housing including a chamber adapted to hold the consumable; and a power supply surface disposed within the chamber, the power supply surface including first and second interdigitated electrodes, the first and second interdigitated electrodes configured to supply electricity through the electrically conductive material to heat the aerosol substrate when the heating element is disposed against the power supply surface.

Description

Technical Field

[0001] The present disclosure relates to an aerosol generating device and a consumable for an aerosol generating device. The consumable may include tobacco or other suitable aerosol base material that is heated rather than burned to generate an aerosol for inhalation.

Background Art

[0002] (Also known as a vaporizer) The popularity and use of risk reduction devices or risk modification devices have grown rapidly in recent years as an aid to help habitual smokers who wish to quit smoking conventional tobacco products such as cigarettes, cigars, cigarillos, and roll-your-own tobacco. In contrast to burning tobacco in conventional tobacco products, various devices and systems are available for heating or warming aerosolizable substances.

[0003] Generally available risk reduction devices or risk modification devices are base heating type aerosol generating devices or heat-not-burn devices. This type of device typically generates an aerosol or vapor by heating an aerosol base material typically containing moist leaf tobacco or other suitable aerosolizable material to a temperature in the range of 150°C to 350°C. By heating the aerosol base material rather than burning or igniting it, an aerosol is released that contains the components desired by the user but does not contain toxic and carcinogenic by-products resulting from burning and ignition. Further, the aerosol produced by heating tobacco or other aerosolizable material typically does not contain the burnt or bitter taste resulting from burning and ignition, which can be unpleasant to the user, and thus the base material does not require sugars and other additives typically added to such materials to make the smoke and / or vapor more palatable to the user.

Summary of the Invention

Problems to be Solved by the Invention

[0004] It is desirable to provide consumables or aerosol generating devices that can generate aerosols with improved energy efficiency or reduced heating time.

[0005] In addition, in consumables and common examples of aerosol generating devices, the heating element is a limiting factor in the usable lifespan of the aerosol generating device. It is desirable to provide a heating element with improved lifespan or one that can be easily replaced while minimizing the resources required. [Means for solving the problem]

[0006] According to a first aspect, the Disclosure provides an aerosol generating device configured to generate an aerosol from a consumable comprising an aerosol substrate, the consumable further comprising a heating element comprising a conductive material, the aerosol generating device comprising a housing comprising a chamber adapted to hold the consumable, and a power supply surface comprising first and second comb electrodes disposed within the chamber, wherein when the heating element is positioned relative to the power supply surface, the first and second comb electrodes are configured to supply electricity through the conductive material to heat the aerosol substrate.

[0007] By providing conductive materials in the electrodes and consumables of an aerosol generating device, heating elements such as heating layers can be replaced with their respective consumables, and a simple interface for supplying power to the heating elements is provided. In addition, by providing comb-shaped electrodes, multiple current paths can be created through the heating elements, allowing the necessary power to be supplied to the heating elements at a lower voltage.

[0008] Optionally, on the power supply surface, multiple teeth of the first comb-shaped electrode mesh with multiple teeth of the second comb-shaped electrode. By meshing the comb-shaped electrodes, multiple short current paths are created through the conductive material, and each current path can be driven at an even lower voltage.

[0009] Optionally, the power supply surface further includes a third electrode isolated from the first electrode and configured to supply electricity through a conductive material and the second electrode, wherein the first and third electrodes are configured to actuate independently to supply electricity through the conductive material. By providing individually actuated electrodes, the heating output can be varied by using any one or more pairs of electrodes.

[0010] Optionally, the chamber includes a base housing portion and a lid housing portion configured to move between an open position in which consumables can be inserted and removed, and a closed position in which the consumables are surrounded by the chamber. By providing the base and lid, consumables can be conveniently added to and removed from the aerosol generating device in the open position, while enabling effective aerosol generation in a closed chamber environment.

[0011] Optionally, the power supply surface is divided into a first portion attached to the base housing and a second portion attached to the lid housing, and the first and second portions of the power supply surface are connected in the closed position. By providing two portions of the power supply surface that are connected in the closed position, the aerosol generating device can be configured to disable heating in the open position and to automatically start heating when the base and lid housing portions are moved to the closed position.

[0012] Optionally, the chamber includes an air inlet and an air outlet configured to allow air to flow through the chamber. By allowing air to flow through the chamber, aerosols can be actively drawn from the consumables when they are generated.

[0013] Optionally, the power supply surface extends across the air inlet or air outlet. This configuration allows air to flow closer to the heat source, potentially improving the efficiency of aerosol generation.

[0014] Optionally, the chamber includes multiple power supply surfaces configured to supply electricity through different regions of the heating layer of the consumable. This may be used to improve the uniformity and rate of aerosol generation within the consumable.

[0015] Optionally, the chamber includes a compression element configured to compress the consumables relative to the power supply surface. Compressing the consumables can improve electrical contact between the power supply surface and the heating layer, thereby improving the efficiency of aerosol generation.

[0016] According to a second embodiment, a consumable is provided which includes an aerosol substrate, the consumable including a heating element which includes a conductive material.

[0017] In one embodiment, the consumables include a body made of an aerosol substrate, and the heating element is an outer heating layer positioned adjacent to the body.

[0018] Optionally, the aerosol substrate body is surrounded by a heating layer around its axis.

[0019] Optionally, the heating layer completely encloses the main body of the aerosol substrate.

[0020] Optionally, the conductive material is at least 10 -5 It has a resistivity of Ω / m.

[0021] Optionally, conductive materials are approximately 10 -2 It has a resistivity of Ω / m.

[0022] Optionally, the conductive material has an conductivity of at least 300 S / m (at 20°C).

[0023] Optionally, the aerosol substrate may include loose material.

[0024] Optionally, the conductive materials for consumables include carbon filament threads such as Kynor, pyrolytic graphite sheets, and / or graphite and / or charcoal particles.

[0025] In another aspect, the heating element is in the form of particles embedded in the aerosol substrate.

[0026] Optionally, the aerosol substrate includes an aerosol forming agent, and the conductive material is disposed within the aerosol substrate to pass an electric current between two electrodes and heat the aerosol substrate to a temperature sufficient to aerosolize the aerosol forming agent.

[0027] Optionally, the thickness of the aerosol substrate can be included in the range of 0.5 to 3 mm, preferably 0.5 to 2 mm.

[0028] Optionally, the particles of the heating element can be distributed within and on the aerosol substrate in an amount that allows electricity to flow between two electrodes through the thickness of the aerosol substrate.

[0029] Optionally, the conductive material can be randomly distributed within the interior and on the surface region of the aerosol substrate.

[0030] Optionally, the conductive material is 2.5 to 50 wt% of the aerosol substrate, preferably 2.5 to 25 wt%.

[0031] Optionally, the aerosol substrate further includes a binder, preferably CMC (carboxymethyl cellulose), in an amount of 0.5 to 2.5 wt% of the aerosol substrate.

[0032] Optionally, the aerosol forming agent is glycerin and / or propylene glycol.

[0033] Optionally, the aerosol forming agent is less than 25 wt% of the aerosol substrate.

[0034] Optionally, the aerosol substrate further includes moisture in an amount of 10 to 49.5 wt%. <00001​

[0036] According to a third embodiment, an aerosol generating system is provided which includes an aerosol generating device according to the first embodiment and consumables according to the second embodiment. [Brief explanation of the drawing]

[0037] [Figure 1A] This is a schematic cross-sectional view of an aerosol generation system according to one embodiment of the present invention. [Figure 1B] This is a schematic cross-sectional view of an aerosol generation system according to one embodiment of the present invention. [Figure 2A] This is a schematic diagram of the power supply surface and its usage method in an embodiment of the present invention. [Figure 2B] This is a schematic diagram of the power supply surface and its usage method in an embodiment of the present invention. [Figure 3] This is a schematic diagram of an alternative power supply surface according to one embodiment. [Figure 4A] This is a schematic diagram of an alternative aerosol generation system according to one embodiment of the present invention. [Figure 4B] This is a schematic diagram of an alternative aerosol generation system according to one embodiment of the present invention. [Figure 5A] This is a further schematic diagram of another alternative aerosol generation system according to one embodiment of the present invention. [Figure 5B] This is a further schematic diagram of another alternative aerosol generation system according to one embodiment of the present invention. [Figure 5C] This is a further schematic diagram of another alternative aerosol generation system according to one embodiment of the present invention. [Figure 6] This is a schematic cross-sectional view of an aerosol generation system according to another embodiment of the present invention. [Modes for carrying out the invention]

[0038] Figures 1A and 1B are schematic cross-sectional views of an aerosol generation system including an aerosol generation device 1 and consumables 2. Figure 1A shows the system in a loaded state with consumables 2 added for aerosol generation. Figure 1B shows the system in a ready state with consumables 2 in position for aerosol generation.

[0039] The aerosol generating device 1 includes a housing 11. In many embodiments, the housing 11 is configured to be handheld. The housing 11 may include, for example, an insulating material. For example, the housing 11 may include a plastic such as polyetheretherketone (PEEK) to minimize wasted heat leakage from the aerosol generating device 1, improve safety when the device is used handheld, and reduce the time and energy required to generate aerosols.

[0040] The housing 11 defines an internal chamber 12 adapted to receive and hold a consumable 2. The housing 11 can be connected to a lid 13 via a flexible attachment, such as a hinge or a cord, and the lid is configured to move between an open position in which the consumable 2 can be inserted into and removed from the chamber 12, and a closed position in which the consumable 2 is surrounded by the chamber 12. As a result, the chamber 12 includes a base housing portion formed in the housing 11 and a lid housing portion formed by the lid 13.

[0041] The aerosol generating device 1 also includes a power supply surface 14 located within the chamber 12. Specifically, in this embodiment, the power supply surface 14 is located on the bottom surface of the chamber 12 opposite to the opening for receiving the consumables 2 into the chamber 12. More generally, the power supply surface 14 may be located on any surface of the chamber 12, including the inner surface of the lid 13.

[0042] Consumable 2 includes an aerosol substrate 21 and a heating element 22. In this embodiment, the heating element 22 is a heating layer 22 adjacent to the main body of the aerosol substrate. When consumable 2 is inserted into the chamber 12, the heating element 22 is positioned relative to the power supply surface 14.

[0043] The aerosol substrate 21 can be any porous solid substrate suitable for generating and releasing aerosols. The substrate may be, for example, a foam, powder, filled strand, or fiber. The substrate typically contains a flavoring agent and an aerosol-forming agent, such as nicotine or tobacco (e.g., in dried leaf or powder form).

[0044] The tobacco may contain tobacco powder with a particle size of less than 1000 microns. The tobacco material may contain yellow tobacco (FCT) in an amount of 1 to 47.5% of the weight of the aerosol base material 21.

[0045] Suitable aerosol-forming agents include polyols (such as sorbitol, glycerol, and glycols such as propylene glycol or triethylene glycol) and non-polyols (such as monohydric alcohols, acids such as lactic acid, glycerol derivatives, triacetin, esters such as triethylene glycol diacetate and triethyl citrate, glycerin, or vegetable glycerin). In some embodiments, the aerosol-forming agent may be glycerol, propylene glycol, or a mixture of glycerol and propylene glycol. Preferably, the aerosol-forming agent may constitute less than 25% by weight of the aerosol base material 21. Preferably, the aerosol-forming agent may constitute more than 5% by weight of the aerosol base material.

[0046] The aerosol substrate 21 may further contain a binder such as CMC (carboxymethylcellulose). The binder may preferably constitute 0.5% to 2.5% by weight of the aerosol substrate.

[0047] The aerosol substrate 21 may further contain moisture. Preferably, the moisture constitutes 10% to 49.5% of the weight of the aerosol substrate.

[0048] The thickness of the aerosol substrate 21 may be 0.5 to 3 mm, or more preferably 0.5 to 2 mm.

[0049] The heating element 22 includes a conductive material. The conductive material may be a metal such as gold. Preferably, the conductive material has an conductivity of at least 300 S / m (at 20°C). However, it is preferable that the heating element has some substantial resistance in order to dissipate heat. For example, the conductive material has at least 10 in the direction of conduction through the material. -5 The material may have a resistivity of Ω / m. This can be achieved using conductive forms of carbon, such as carbon filament threads (e.g., Kynor), pyrolysis graphite sheets, or carbon particles of graphite and / or charcoal. In embodiments where the heating element 22 is a separate heating layer 22, the heating layer 22 may take the form of a continuous plate or foil and / or may include individual strips or meshes of conductive material.

[0050] As further shown in Figure 2B (described later), the heating element 22 is configured to complete the electrical circuit with the power supply surface 14 and supply heat to the aerosol substrate 21. When the aerosol substrate 21 is heated, the volatile components of the aerosol substrate 21 (such as aerosol-forming agents) evaporate and form an aerosol.

[0051] In some embodiments, the size of the consumable 2 and the chamber 12 may be configured such that when the lid 13 is in the closed position, the lid 13 functions as a compression element, compressing the consumable 2 against the power supply surface 14. This compression can improve the electrical contact between the power supply surface 14 and the heating layer 22, and can also improve aerosol generation in the aerosol substrate 21.

[0052] The aerosol generating device further includes an air channel 15 configured to take in air at an inlet 151 and guide the air through a chamber 12 to an outlet 152. As the air flows through the chamber 12, an aerosol is added to the air and transported to the outlet 152, where the user can inhale the aerosol.

[0053] The air passage 15 intersects with the chamber 12 at internal air inlets and outlets of the chamber 12, which are configured to allow air to flow through the chamber 12. The aerosol substrate 21 is typically porous so that air can flow through the consumable 2 when the consumable is in a predetermined position within the chamber 12. In addition or alternatively, air can flow around the consumable 2 within the chamber 12.

[0054] In some embodiments, the outlet 152 may be configured as a mouthpiece. Air can be driven through the air passage 15 by user inhalation or actively driven using a pump. The chamber 12 is preferably located near the outlet 152 to shorten the length of the passage through which the aerosol is transported, thereby reducing aerosol condensation within the aerosol generating device 1.

[0055] The aerosol generating device 1 also includes control electronic equipment (not shown) for controlling the supply of power to the power supply surface 14. The aerosol generating device 1 may also include a connector for an internal power supply (such as a battery) or an external power supply. The aerosol generating device 1 may also include a temperature sensor configured to measure the temperature inside the chamber 12, an airflow sensor configured to measure the airflow through the air passage 15, and / or a user interface configured to display the status of the aerosol generating device 1 and / or to allow a user to control the aerosol generating system 1.

[0056] Figures 2A and 2B are schematic diagrams showing further details of the power supply surface 14 in one example. Figure 2A is a top view showing the power supply surface 14 in a planar configuration on the surface of the chamber 12. Figure 2B is a cross-sectional view perpendicular to Figure 2A, along line x labeled in Figure 2A, and further shows the heating layer 22 of the consumables 2 positioned relative to the power supply surface 14.

[0057] The power supply surface 14 includes a first comb-shaped electrode 141 and a second comb-shaped electrode 142. The first and second comb-shaped electrodes define an electrical circuit gap that closes when the heating element 22 of the consumable 2 is placed against the power supply surface 14. Each of the first and second comb-shaped electrodes is connected to a control electronic device to receive power. When a potential difference is applied between the first comb-shaped electrode 141 and the second comb-shaped electrode 142, current flows through the heating element 22, for example, along the arrow shown in Figure 2B.

[0058] Preferably, the first and second comb-shaped electrodes are arranged such that multiple teeth of the first comb-shaped electrode mesh with multiple teeth of the second comb-shaped electrode, as shown in Figure 2A. In this way, the conduction distance of the heating element 22 between electrodes 141 and 142 is short, but the conduction area of ​​the heating element 22 extends over the area covered by the power supply surface 14. By shortening the conduction distance within the heating element 22, the potential difference required between the first comb-shaped electrode 141 and the second comb-shaped electrode 142 can be made smaller compared to other designs, allowing the use of a small voltage, for example, 3-4V. In the comparative design, electrodes were placed only at both ends of the heating layer, requiring a voltage of approximately 30V.

[0059] The comb-shaped electrodes 141, 142 may be thin conductive tracks supported by the inner surface of the chamber 12. Alternatively, the power supply surface 14 may include a base surface on which the conductive tracks are arranged, or it may be a self-supporting module having thick conductive tracks on which it stands on its own. The comb-shaped electrodes 141, 142 may include tracks made of, for example, copper or gold.

[0060] Figure 3 is a schematic diagram of an alternative power supply surface 14. Only the differences from the power supply surface described above are explained; in other respects, the power supply surface can be considered similar.

[0061] In this embodiment, the power supply surface 14 further includes a third electrode 143 isolated from the first electrode 141. The third electrode 143 is configured similarly to the first electrode 141 and supplies electricity through the heating layer 22 and the second electrode 142. However, the first electrode 141 and the third electrode 143 can be driven independently through separate electrical connections to control electronic equipment. This means that the heating rate of the heating element 22 can be controlled by operating each of the first and second electrodes 141 and 143 independently.

[0062] More generally, the power supply surface 14 may include any number of comb-shaped electrodes configured to independently supply power through the heating element 22.

[0063] Figures 4A and 4B are schematic diagrams of an alternative aerosol generation system. Only the differences from the aerosol generation system described above are explained; in other respects, the system may be considered similar. Figure 4A is a cross-sectional view perpendicular to the direction of airflow through chamber 12. Figure 4B is a flattened depiction corresponding to the curved inner surface shown in the cross-sectional view of Figure 4A.

[0064] In this alternative aerosol generation system shown in Figures 4A and 4B, the feeding surface 14 is divided across two surfaces of the chamber 12. More specifically, the first portion of the feeding surface 14 is attached to the base housing portion 11, and the second portion of the feeding surface 14 is attached to the lid housing portion 13. As shown in Figure 4B, in the open position, the first and second comb electrodes 141 and 142 are separated. When the lid 13 is closed, the first and second portions of the feeding surface 14 connect to each other, forming a structure similar to that in Figure 2A.

[0065] In addition, Figures 4A and 4B show that the power supply surface 14 does not need to be flat, but can be a curved surface extending around the chamber 12 into which the consumables 2 are inserted.

[0066] Furthermore, in the alternative aerosol generation systems shown in Figures 4A and 4B, the heating layer 22 surrounds the aerosol substrate 21 around its axis. This configuration allows the heating layer 22 and the power supply surface 14 to be arranged concentrically around the aerosol substrate 21 in the closed position, enabling more efficient heat delivery to the aerosol substrate 21.

[0067] Figures 5A, 5B, and 5C are further schematic diagrams of another alternative aerosol generation system. Figure 5A is similar to the cross-sectional views in Figures 1A and 1B, but shows a different arrangement of the power supply surface 14 and heating layer 22 as described below. Figures 5B and 5C are schematic diagrams of the air inlet or air outlet 153 of the chamber 12 in another alternative aerosol generation system.

[0068] In Figure 1A, the air passage 15 intersects with the chamber 12 at an internal air inlet and air outlet configured to allow air to flow through the chamber 12. In the aerosol generation systems of Figures 5A, 5B, and 5C, the heating components are connected across the air inlet or air outlet of the chamber 12.

[0069] More specifically, the first and second comb-shaped electrodes 141 and 142 extend across the opening 153 (internal air inlet or air outlet), as shown in Figure 5B. The airflow passes through the first and second comb-shaped electrodes 141 and 142 and through the heating layer 22 (which may be porous, mesh-like, or strip-like in structure).

[0070] The housing 11 may include a grill structure across the opening 153 to support the first and second comb electrodes 141, 142, as shown in Figure 5B. Alternatively, the first and second comb electrodes 141, 142 may be freestanding across the opening 153. In either case, the gap between the first comb electrode 141 and the second comb electrode 142 allows for airflow. By directing the airflow to the immediate vicinity of the heating portion within the heating layer 22 (as driven by electrodes 141, 142), aerosol generation can be locally concentrated near the airflow so that a larger proportion of the generated aerosol is drawn out from the aerosol generating device 1.

[0071] As described above, Figures 4A to 5C illustrate a method for increasing the heating surface area using the power supply surface 14 and the heating layer 22. To further enhance heating efficiency, one or more power supply surfaces 14 may cover all surfaces of the chamber 12 that come into contact with the consumable 2, such that each power supply surface 14 supplies electricity through different areas of the heating layer 22. For this purpose, the heating layer 22 can completely enclose the body of the aerosol substrate 21.

[0072] The heating layer 22, which completely encloses the body of the aerosol substrate 21, may also be used in other embodiments to improve the convenience of inserting the consumable 2, because if the heating layer 22 is present on all outer surfaces of the consumable 2, the orientation is no longer relevant.

[0073] The heating layer 22, which completely encloses the body of the aerosol substrate 21, can also be used to provide a bag for the aerosol substrate 21 in embodiments where the aerosol substrate 21 is a loose material such as a powder.

[0074] Figure 6 is a schematic diagram of a further alternative aerosol generation system. The alternative aerosol generation system is almost identical to the example described above, and only the differences are explained.

[0075] As shown in Figure 6, the heating element does not need to be a heating layer separate from the body of the aerosol substrate. Instead, in this embodiment, the heating element is in the form of particles embedded in the aerosol substrate. For example, the particles may include graphite or charcoal. The particles are provided in an amount and / or size sufficient to allow electricity to flow through the particles between the first comb-shaped electrode 141 and the second comb-shaped electrode 142. Preferably, the contact between the particles is sufficient to allow current to flow between the electrodes and / or the particles are arranged on the surface of the substrate so that they are in contact with the electrodes. Furthermore, the amount of particles increases the conductivity of the aerosol substrate. This flow of electricity dissipates the heat due to the resistance of the aerosol substrate and raises the temperature of the aerosol substrate to a sufficient degree to aerosolize the aerosol-forming agent. In this example, consumable 1 may be similar to the consumable described in the concurrently pending European Patent Application Publication No. 21161783.2 entitled "Electrically conductive consumable". It is preferable that the particles are small and uniformly distributed (unlike the schematic diagram in Figure 6) so that the particles have a uniform effect on the conductivity of the aerosol substrate and the current flowing through the substrate can be reasonably predicted.

[0076] The conductive material may be randomly distributed within the aerosol substrate and on its surface. The conductive material may be 2.5% to 50% of the weight of the aerosol substrate 21.

Claims

1. An aerosol generating device configured to generate an aerosol from a consumable containing an aerosol substrate, wherein the consumable further includes a heating element containing a conductive material, and the aerosol generating device is A housing including a chamber adapted to hold the aforementioned consumables, A power supply surface including first and second comb-shaped electrodes is arranged within the chamber. An aerosol generating device comprising, wherein when the heating element is positioned relative to the power supply surface, the first and second comb-shaped electrodes are configured to supply electricity through the conductive material to heat the aerosol substrate.

2. The aerosol generating device according to claim 1, wherein, on the power supply surface, a plurality of teeth of the first comb-shaped electrode mesh with a plurality of teeth of the second comb-shaped electrode.

3. The aerosol generating device according to claim 1 or 2, wherein the power supply surface further includes a third electrode isolated from the first electrode and configured to supply electricity through the conductive material and the second electrode, and the first electrode and the third electrode are configured to operate independently to supply electricity through the conductive material.

4. The aerosol generating device according to any one of claims 1 to 3, wherein the chamber includes a base housing portion and a lid housing portion configured to move between an open position in which the consumables can be inserted and removed and a closed position in which the consumables are surrounded by the chamber.

5. The aerosol generating device according to any one of claims 1 to 4, wherein the chamber includes an air inlet and an air outlet configured to allow air to flow through the chamber.

6. The aerosol generating device according to claim 5, wherein the power supply surface extends across the air inlet or the air outlet.

7. The aerosol generating device according to any one of claims 1 to 6, wherein the chamber includes a plurality of power supply surfaces configured to supply electricity through different regions of the heating element of the consumable.

8. The aerosol generating device according to any one of claims 1 to 7, wherein the chamber includes a compression element configured to compress the consumables with respect to the power supply surface.

9. An aerosol generating system comprising an aerosol generating device according to any one of claims 1 to 8 and a consumable product comprising an aerosol substrate, wherein the consumable product further comprises a heating element comprising a conductive material.

10. The aerosol generating system according to claim 9, wherein the consumable includes a body of an aerosol substrate, and the heating element is an outer heating layer disposed adjacent to the body.

11. The aerosol generating system according to claim 10, wherein the main body of the aerosol substrate is surrounded by the heating layer around its axis.

12. The aerosol generating system according to claim 10 or 11, wherein the heating layer completely encloses the main body of the aerosol substrate.

13. The conductive material is at least 10 －５ An aerosol generating system according to any one of claims 9 to 12, having a resistivity of Ω / m.

14. The aerosol generating system according to any one of claims 9 to 13, wherein the aerosol substrate includes loose material.

15. The aerosol generating system according to any one of claims 9 to 14, wherein the conductive material comprises carbon filament yarn, pyrolysis graphite sheet and / or graphite and / or charcoal particles.

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