Cartridge for induction heating aerosol generator

Abstract

The present invention relates to a cartridge for use in an aerosol generating device. The cartridge comprises a hollow tubular susceptor arrangement. The cartridge comprises a hollow tubular wick element. The hollow tubular wick element coaxially surrounds the susceptor arrangement. The cartridge comprises a hollow tubular liquid reservoir. The hollow tubular liquid reservoir coaxially surrounds the wick element. The present invention further relates to an aerosol generating system comprising an aerosol generating device and the cartridge. The present invention further relates to a method of manufacturing a cartridge for an aerosol generating device.

Description

[Technical field]

[0001] The present disclosure relates to a cartridge for an aerosol generating device. The present disclosure further relates to an aerosol generating system comprising an aerosol generating device and a cartridge. The present disclosure further relates to a method for manufacturing a cartridge for an aerosol generating device. [Background technology]

[0002] It is known to provide aerosol generating devices for producing an inhalable vapor. Such devices may heat an aerosol-forming substrate contained in a cartridge or aerosol-generating article without combusting the aerosol-forming substrate. The heating arrangement may be an induction heating arrangement and may comprise an induction coil and a susceptor. The susceptor may be part of the device or may be part of the article or cartridge.

[0003] When heated to a target temperature, the aerosol-forming substrate vaporizes to form an aerosol. The aerosol-forming substrate may be in solid or liquid form. The liquid aerosol-forming substrate may be contained within a liquid reservoir and delivered to the heating element via a capillary component. The liquid reservoir may form part of a replaceable or refillable cartridge.

[0004] It would be desirable to provide a cartridge that is easily manufactured with low manufacturing costs. It would be desirable to provide a cartridge having a susceptor and wick assembly that remains robust and stable when the susceptor is heated to high temperatures. It would be desirable to provide a cartridge that has effective leak protection. It would be desirable to provide a compact cartridge with low space requirements. It would be desirable to provide a cartridge design that can be universally configured to meet the needs of different aerosol generator designs. It would be desirable to provide a cartridge that can be used with existing inductively heated aerosol generators. Summary of the Invention

[0005] According to an embodiment of the present invention, there is provided a cartridge for use with an aerosol generating device. The cartridge may comprise a hollow tubular susceptor arrangement. The cartridge may comprise a hollow tubular wick element. The hollow tubular wick element may coaxially surround the susceptor arrangement. The cartridge may comprise a hollow tubular liquid reservoir. The hollow tubular liquid reservoir may coaxially surround the wick element.

[0006] According to an embodiment of the present invention, there is provided a cartridge for use with an aerosol generating device. The cartridge comprises a hollow tubular susceptor arrangement. The cartridge comprises a hollow tubular wick element. The hollow tubular wick element coaxially surrounds the susceptor arrangement. The cartridge comprises a hollow tubular liquid reservoir. The hollow tubular liquid reservoir coaxially surrounds the wick element.

[0007] The cartridge of the present invention may enable a susceptor and wick assembly comprising a hollow tubular susceptor arrangement and a hollow tubular wick element to be configured to be insertable into a hollow tubular liquid storage portion. A cartridge may be provided that is easily manufactured with low manufacturing costs. A cartridge may be provided having a susceptor and wick assembly that remains robust and stable when the susceptor is heated to high temperatures. A cartridge may be provided that has effective leak-proofing. A compact cartridge with low space requirements may be provided. A cartridge design may be provided that can be universally configured to meet the needs of different aerosol generator designs. A cartridge may be provided that can be used with existing inductively heated aerosol generators.

[0008] The cartridge may be used with an induction heating aerosol generating device that includes one or more inductor coils. An alternating current in the inductor coil induces an alternating magnetic field. This alternating magnetic field is called an induction field because it can induce alternating ring currents (eddy currents) in the susceptor if the susceptor is conductive. If the susceptor is magnetic, hysteresis losses will occur in the susceptor. In a susceptor that is both conductive and magnetic, both effects (eddy currents and hysteresis losses) cause the susceptor to heat up. Generally, a material that heats up when penetrated by an alternating magnetic field is called a susceptor. The heat thus generated is then transferred to the aerosol generating substrate, causing the aerosol generating substrate to heat up and thus generate an aerosol. The hollow tubular susceptor element of the cartridge of the present invention can be heated by the inductor coil of the aerosol generating device.

[0009] The cartridge may include an airflow path extending along a central longitudinal axis within the hollow tubular susceptor arrangement. The cartridge airflow path may extend from a distal end of the cartridge to a proximal end of the cartridge. The distal end of the cartridge may be the upstream end. The proximal end of the cartridge may be the downstream end.

[0010] The cartridge may include a mouthpiece, which may be disposed at the proximal or downstream end of the cartridge.

[0011] The cartridge may include one or both of a first sealing element disposed at a proximal end of the susceptor arrangement and the core element, and a second sealing element disposed at a distal end of the susceptor arrangement and the core element.

[0012] One or both of the first and second sealing elements may be formed as a sealing disk. The sealing disk may have the shape of a flattened hollow tubular cylinder.

[0013] One or both of the first sealing element and the second sealing element may have a non-planar outer wall.One or both of the first sealing element and the second sealing element may have a concave, convex, or corrugated outer wall.

[0014] Thereby, the sealing effect can be promoted when the assembly formed by the susceptor, the wick and the sealing element is inserted into the hollow tubular liquid storage portion to form a cartridge. Thereby, the frictional forces during the insertion of the susceptor and wick assembly into the hollow tubular liquid storage portion can be reduced. Sealing and mechanical insertion can be optimized.

[0015] The sealing element may be made of an elastomeric polymeric material.

[0016] The cartridge may include a first sealing element disposed at a first end of the susceptor arrangement and the core element, and a second sealing element disposed at an opposite second end of the susceptor arrangement and the core element. The second sealing element may have the same shape as the first sealing element, preferably the sealing disk.

[0017] The wall of the hollow tubular susceptor arrangement may include a slit extending from the proximal end to the distal end of the wall of the hollow tubular susceptor arrangement. The slit may be a continuous gap in the tubular sidewall of the tubular susceptor element, the gap extending continuously from the proximal end to the distal end of the tubular susceptor element. The slit may be a primarily longitudinal gap.

[0018] The wall of the susceptor arrangement may include a slit extending along an axial direction from a proximal end to a distal end of the wall of the susceptor arrangement.The wall of the susceptor arrangement may include a slit extending along an angled or curved direction with respect to the axial direction from a proximal end to a distal end of the wall of the susceptor arrangement.

[0019] The slits may provide a degree of transverse elasticity to the tubular susceptor element or susceptor arrangement. This may help to allow for suitable elasticity or transverse compressibility for insertion of the susceptor arrangement into the inner cavity of the hollow tubular core element. This may also help to allow for suitable transverse elasticity for retaining the susceptor arrangement within the inner cavity of the hollow tubular core element. The elastic susceptor arrangement may be transversely compressed during insertion, and the inserted susceptor arrangement may then relax against the inner wall of the tubular core element, thereby being firmly attached to the core element.

[0020] During use, the susceptor arrangement is heated. The slits may help to compensate for different thermal expansion coefficients and different temperatures of the core element and the susceptor arrangement. If the inner susceptor arrangement has a larger thermal expansion than the outer core element, the susceptor arrangement may escape by closing the gap.

[0021] The slits may allow for a reduction in the diameter of the susceptor arrangement for insertion, the slits may help to keep the susceptor arrangement in place based on the elasticity of the material, and the slits may compensate for dimensional changes when the susceptor arrangement is heated based on induction heating.

[0022] The walls of the susceptor arrangement may be fluid-permeable. The susceptor arrangement may comprise a porous material. The fluid-permeable walls of the susceptor arrangement may be made of a porous material. The fluid-permeable walls of the susceptor arrangement may comprise perforations. The fluid-permeable walls of the susceptor arrangement may be made of a non-porous material and comprise perforations.

[0023] The susceptor arrangement may include a carbon-based material. The susceptor arrangement may include a porous carbon-based material. The porous carbon-based material may include magnetic graphene. The porous carbon-based material may include one or more of magnetic carbon-based materials, such as irradiated graphite, nanocarbon, fullerene, oxygen-containing carbon, and graphene with point defects. The porous carbon-based material may include one or more carbon-based compounds with a metallic structure dispersion, such as Fe3O4-graphitized carbon black (mGCB) composites that can be used to create porous sheets, perforated structures, or compressed granular structures to obtain a desired porosity.

[0024] The susceptor arrangement may include one or both of a metal and an alloy. The susceptor arrangement may include a ferromagnetic alloy material. The ferromagnetic alloy material may be perforated to provide a desired porosity. The alloy material may be a ferromagnetic Inox alloy.

[0025] The susceptor arrangement may include at least one ferromagnetic stainless steel alloy. The susceptor arrangement may include 304 stainless steel. The susceptor arrangement may include one or more ferritic stainless steel alloys, such as those that are ferromagnetic and are used as magnetic components such as solenoid cores, pole pieces, and return paths. The susceptor arrangement may include 410 stainless steel alloy.

[0026] The wall of the core element may be fluid permeable. The fluid permeable wall of the core element may be made of a porous material.

[0027] The core element may be a monolithic element.

[0028] The core element may comprise a ceramic material. The core element may comprise a porous material. The core element may comprise a porous ceramic material. The core element may comprise a porous silica ceramic. The porosity of the sintered material can be adjusted by varying the content of the introduced silica particles and varying their particle size, which allows good control of the desired porosity of the final product.

[0029] The porosity of the core element may be from 30% to 80%, preferably from 40% to 70%, and most preferably from 50% to 60%.

[0030] As used herein, "porosity" is defined as the percentage of a unit volume that is void of a material. Porosity may be derived using standard methods and equations, giving a decimal value of porosity. By knowing the pore volume (Vp) of a defined volume of material and its total volume (Vt), the porosity (Pt) is given by the ratio Vp / Vt. To express porosity as a percentage, simply multiply the decimal by 100%. For example, Pt=0.51, so 0.51×100%=51%.

[0031] The susceptor arrangement, or at least the hollow tubular susceptor elements of the susceptor arrangement, may be porous and the core elements may be porous. The porosity of the core elements may be in the range of 30% to 80%, preferably 40% to 70%, more preferably 50% to 60%. The porosity of the susceptor arrangement, or at least the hollow tubular susceptor elements of the susceptor arrangement, may be in the range of 25% to 80%, preferably 55% to 75%, more preferably 65% ​​to 75%.

[0032] The porosity of the susceptor arrangement, or at least the porosity of the hollow tubular susceptor elements of the susceptor arrangement, may be the same as the porosity of the core elements.

[0033] The porosity of the susceptor arrangement, or at least the porosity of the hollow tubular susceptor elements of the susceptor arrangement, may be less than the porosity of the core elements.

[0034] The porosity of the susceptor arrangement, or at least the porosity of the hollow tubular susceptor elements of the susceptor arrangement, may be greater than the porosity of the core elements.

[0035] The susceptor arrangement may comprise a first hollow tubular susceptor element coaxially surrounding a second hollow tubular susceptor element.

[0036] One or both of the walls of the first hollow tubular susceptor element and the second hollow tubular susceptor element may include a slit extending from the proximal end to the distal end of the wall of the respective hollow tubular susceptor element.

[0037] The wall of the first hollow tubular susceptor element may have a slit extending along the axial direction from the proximal end to the distal end of the wall of the first hollow tubular susceptor element, and the wall of the second hollow tubular susceptor element may have a slit extending along a direction angled relative to the axial direction from the proximal end to the distal end of the wall of the second hollow tubular susceptor element, or vice versa.

[0038] The first hollow tubular susceptor element may comprise a porous carbon-based material and the second hollow tubular susceptor element may comprise a perforated ferromagnetic alloy material, or vice versa.

[0039] The length of the core element may range from 3.9 mm to 20 mm, preferably from 4.1 mm to 15 mm. The outer diameter of the core element may range from 2.3 mm to 7.1 mm, preferably from 2.7 mm to 4.7 mm.

[0040] The inner diameter of the core element may range from 0.7 millimeters to 4.6 millimeters, preferably from 1.0 millimeters to 3.5 millimeters.

[0041] The length of the susceptor arrangement may differ from the length of the core element by less than 10%, preferably less than 5%, more preferably less than 2%, and most preferably less than 1%.

[0042] The fluid-permeable portion of the inner wall of the liquid reservoir may be in direct physical contact with the outer wall of the core element, which may allow the liquid aerosol-forming substrate to migrate from the liquid reservoir to the core element.

[0043] The cartridge may have a cylindrical shape. The outer diameter of the cylindrical cartridge may be 5 mm to 10 mm, preferably 6 mm to 8 mm.

[0044] The outer diameter of the hollow tubular susceptor arrangement may be 80% to 99% of the inner diameter of the hollow tubular core element.

[0045] The outer diameter of the hollow tubular core element may be smaller than the inner diameter of the hollow tubular liquid storage portion. The outer diameter of the hollow tubular core element may be 80% to 99% of the inner diameter of the hollow tubular liquid storage portion. The outer diameter of the hollow tubular core element may be 2.3 mm to 7.1 mm, preferably 2.7 mm to 4.7 mm, and the inner diameter of the hollow tubular liquid storage portion may be 2.4 mm to 8 mm, preferably 2.8 mm to 5.0 mm.

[0046] The present invention further relates to an aerosol generation system comprising a cartridge as described herein and an aerosol generation device comprising a heating chamber for receiving the cartridge and an inductor coil at least partially surrounding the periphery of the heating chamber for inductively heating the cartridge.

[0047] The invention further relates to a method of manufacturing a cartridge for an aerosol generating device, the method comprising providing a wick and susceptor assembly comprising a hollow tubular susceptor arrangement and a hollow tubular wick element coaxially surrounding the susceptor arrangement, the method comprising inserting the wick and susceptor assembly into the hollow tubular liquid storage portion such that the hollow tubular liquid storage portion coaxially surrounds the wick and susceptor assembly.

[0048] The susceptor arrangement may include at least one flexible sheet including the susceptor material, and the step of providing a core and susceptor assembly may include bending the sheet to form a hollow tubular susceptor element and inserting the hollow tubular susceptor element into the hollow tubular core element.

[0049] The method may include attaching a first sealing disk to a first end of the core and susceptor assembly, and optionally attaching a second sealing disk to a second end of the core and susceptor assembly, prior to the step of inserting the core and susceptor assembly into the hollow tubular liquid storage portion.

[0050] The liquid storage portion of the cartridge may include one or both of a liquid aerosol-forming substrate and a liquid sensory medium. The liquid sensory medium may include a flavoring agent. The liquid sensory medium may include nicotine. The liquid aerosol-forming substrate or liquid sensory medium may include a flavoring agent, such as menthol or an herbal compound. The liquid aerosol-forming substrate or liquid sensory medium may include nicotine. The liquid aerosol-forming substrate or liquid sensory medium may include botanical content, such as CBD.

[0051] The core element may comprise cotton.The core element may be made from cotton.

[0052] The wick element may be a porous element. The wick element may have the ability to absorb liquid from the air stream. The wick element may comprise a capillary material. The capillary material may have a fibrous or cavernous structure. The capillary material preferably comprises a bundle of capillaries. For example, the capillary material may comprise a plurality of fibers or threads, or other fine tubes. The fibers or threads may be generally aligned to transport liquid from a distal portion of the core element to a proximal portion of the core element. Alternatively, the capillary material may comprise a cavernous or foam-like material. The structure of the capillary material may form a plurality of small holes or tubes through which liquid can be transported by capillary action. The capillary material may comprise any suitable material or combination of materials. Examples of suitable materials are sponge or foam materials, ceramic or graphite-based materials in the form of fibers or sintered powders, foamed metal or plastic materials, fibrous materials, such as fibrous materials made of spun or extruded fibers (such as cellulose acetate, polyester, or bonded polyolefin, polyethylene, ethylene or polypropylene fibers, nylon fibers or ceramics). The capillary material may have any suitable capillary action and porosity to be used with different liquid physical properties. The liquid has physical properties including, but not limited to, viscosity, surface tension, density, thermal conductivity, boiling point, and vapor pressure that allow the liquid to be moved through the capillary material by capillary action. The capillary material may be configured to carry the aerosol-forming substrate to the proximal portion of the wick element and to the susceptor element. The capillary material may extend into the gaps in the susceptor element.

[0053] As used herein, the term "liquid sensory medium" refers to a liquid composition capable of modifying an airflow that contacts the liquid sensory medium. The modification of the airflow may be one or more of forming an aerosol or vapor, cooling the airflow, and filtering the airflow. For example, the liquid sensory medium may include an aerosol-forming substrate capable of releasing a volatile compound capable of forming an aerosol or vapor. The aerosol-forming substrate in the liquid sensory medium is preferably a flavorant or includes a flavorant. Alternatively, or additionally, the liquid sensory medium may include one or both of a cooling material for cooling the airflow passing through the liquid sensory medium and a filtering material for capturing undesirable components in the airflow. Water may be used as a cooling material. Water may be used as a filtering material for capturing particles, such as dust particles, from the airflow. The liquid sensory medium may function as one or more of a nicotine-delivering liquid, a flavor enhancer, and a bulking agent.

[0054] As used herein, the term "aerosol-forming substrate" refers to a substrate capable of releasing volatile compounds capable of forming an aerosol or vapor. Such volatile compounds may be released by heating the aerosol-forming substrate. The aerosol-forming substrate may be in solid or liquid form. The terms "aerosol" and "vapor" are used interchangeably.

[0055] The aerosol-forming substrate may be part of the aerosol-generating article. The aerosol-forming substrate may be part of a liquid held in a liquid storage portion of the cartridge. The aerosol-forming substrate may be part of a liquid sensory medium held in a liquid storage portion of the cartridge. The liquid storage portion may contain a liquid aerosol-forming substrate. Alternatively, or additionally, the liquid storage portion may contain a solid aerosol-forming substrate. For example, the liquid storage portion may contain a suspension of a solid aerosol-forming substrate and a liquid. Preferably, the liquid storage portion contains a liquid aerosol-forming substrate.

[0056] Preferably, a liquid nicotine or flavour / flavour-containing aerosol-forming substrate may be used in the liquid storage portion of the cartridge.

[0057] The aerosol-forming substrate may comprise nicotine. The nicotine-containing aerosol-forming substrate may be a nicotine salt matrix.

[0058] The aerosol-forming substrate may comprise a plant-derived material. The aerosol-forming substrate may comprise tobacco. The aerosol-forming substrate may comprise a tobacco-containing material comprising volatile tobacco flavour compounds which are released from the aerosol-forming substrate upon heating. Alternatively, the aerosol-forming substrate may comprise a non-tobacco material. The aerosol-forming substrate may comprise a homogenised plant-derived material. The aerosol-forming substrate may comprise a homogenised tobacco material. The homogenised tobacco material may be formed by agglomerating particulate tobacco.

[0059] The aerosol-forming substrate may include at least one aerosol former. The aerosol former is any suitable known compound or mixture of compounds that facilitates the formation of a dense, stable aerosol in use and is substantially resistant to thermal decomposition at the operating temperature of the device. Suitable aerosol formers are well known in the art and include, but are not limited to, polyhydric alcohols (such as triethylene glycol, 1,3-butanediol, glycerin, etc.), esters of polyhydric alcohols (such as glycerol monoacetate, diacetate, or triacetate, etc.), and aliphatic esters of mono-, di-, or polycarboxylic acids (such as dimethyl dodecanedioate, dimethyl tetradecanedioate, etc.). A preferred aerosol former is a polyhydric alcohol or mixtures thereof (such as triethylene glycol, 1,3-butanediol, etc.). Preferably, the aerosol former is glycerin. When present, the homogenized tobacco material may have an aerosol former content of 5 weight percent or more on a dry weight basis, and preferably has an aerosol former content of 5 weight percent to 30 weight percent on a dry weight basis. The aerosol-forming substrate may contain other additives and ingredients, such as flavourants.

[0060] As used herein, the term "aerosol-generating article" refers to an article that includes an aerosol-forming substrate capable of releasing a volatile compound capable of forming an aerosol. For example, the aerosol-generating article may be an article that generates an aerosol that can be directly inhaled by a user sucking or puffing on a mouthpiece at the proximal or user end of the device. The aerosol-generating article may be disposable. The aerosol-generating article may be insertable into a heating chamber of an aerosol-generating device.

[0061] As used herein, the term "liquid reservoir" refers to a reservoir that includes a liquid sensory medium and, additionally or alternatively, an aerosol-forming substrate capable of releasing a volatile compound capable of forming an aerosol. The liquid reservoir may be configured as a container or reservoir for storing the liquid aerosol-forming substrate.

[0062] The entire hollow tubular liquid storage portion may coaxially surround the core element. The hollow tubular liquid storage portion comprising the liquid aerosol-forming substrate may coaxially surround the core element. The hollow tubular liquid storage portion comprising a container or reservoir for storing the liquid aerosol-forming substrate may coaxially surround the core element. Hence, the container or reservoir holding the liquid aerosol-forming substrate may coaxially surround the core element. When the container or reservoir is filled with the liquid aerosol-forming substrate, the liquid aerosol-forming substrate may therefore coaxially surround the core element.

[0063] The liquid reservoir may be configured as a replaceable tank or container. The liquid reservoir may be of any suitable shape and size. For example, the liquid reservoir may be substantially cylindrical. The cross section of the liquid reservoir may be, for example, substantially circular, elliptical, square, or rectangular.

[0064] As used herein, the term "aerosol-generating device" refers to a device that interacts with an aerosol-generating article and / or a cartridge to generate an aerosol.

[0065] As used herein, the term "aerosol generating system" refers to a combination of an aerosol generating device and one or both of a cartridge and an aerosol generating article, in which the aerosol generating device and one or both of the aerosol generating article and cartridge cooperate to generate a respirable aerosol.

[0066] The aerosol generating device is preferably portable. The aerosol generating device may have a size comparable to a conventional cigar or cigarette. The device may be an electrically operated smoking device. The device may be a handheld aerosol generating device. The aerosol generating device may have a total length of between 30 mm and 150 mm. The aerosol generating device may have an outer diameter of between 5 mm and 30 mm.

[0067] The aerosol generating device may comprise a housing. The housing may be elongated. The housing may comprise any suitable material or combination of materials. Examples of suitable materials include metals, alloys, plastics, or composites containing one or more of these materials, or thermoplastics suitable for food or pharmaceutical applications, such as polypropylene, polyetheretherketone (PEEK), and polyethylene. Preferably, the material is light and not brittle.

[0068] The housing may include at least one air inlet. The housing may include multiple air inlets.

[0069] The aerosol generating device may include a heating element, which may include at least one inductor coil for inductively heating the one or more susceptors.

[0070] Operation of the heating element may be triggered by a puff detection system. Alternatively, the heating element may be triggered by pressing an on-off button and held for the duration of the user's puff. The puff detection system may be provided as a sensor, which may be configured as an airflow sensor for measuring airflow velocity. Airflow velocity is a parameter that characterizes the amount of air per time drawn by the user through the airflow path of the aerosol generating device. The start of a puff may be detected by the airflow sensor when the airflow exceeds a predefined threshold. The start may also be detected after the user activates the button. The sensor may also be configured as a pressure sensor.

[0071] The aerosol generating device may include a user interface for activating the aerosol generating device, such as a button to initiate heating of the aerosol generating device, or a display to indicate the status of the aerosol generating device or the aerosol-forming substrate.

[0072] The aerosol generating device may include additional components, such as, for example, an electrically operated or charging unit for recharging an on-board power source within the electric aerosol generating device.

[0073] As used herein, the term "proximal" refers to the user or mouth end of an aerosol generating device or system or portion thereof, and the term "distal" refers to the end opposite the proximal end. When referring to a heating chamber, the term "proximal" refers to the area closest to the open end of the cavity, and the term "distal" refers to the area closest to the closed end.

[0074] As used herein, the terms "upstream" and "downstream" are used to describe the relative location of a component or portion of a component of an aerosol generating device with respect to the direction in which a user draws on the aerosol generating device when the aerosol generating device is in use.

[0075] The term "airflow path" as used herein means a channel suitable for transporting a gaseous medium. The airflow path may be used to transport ambient air. The airflow path may be used to transport an aerosol. The airflow path may be used to transport a mixture of air and an aerosol.

[0076] As used herein, "susceptor" or "susceptor element" refers to an element that heats up when subjected to an alternating magnetic field. This may be the result of eddy currents induced in the susceptor element, or hysteresis losses, or both eddy currents and hysteresis losses. In use, the susceptor element is positioned in thermal contact or in thermal proximity with an aerosol-forming substrate received in an aerosol generation device or cartridge. In this manner, the aerosol-forming substrate is heated by the susceptor, thereby forming an aerosol.

[0077] The susceptor material may be any material that can be inductively heated to a temperature sufficient to aerosolize the aerosol-forming substrate. The following examples and features relating to the susceptor may apply to one or both of the susceptor element of the cartridge, the susceptor of the aerosol-generating device, and the susceptor of the aerosol-generating article. Suitable materials for the susceptor material include graphite, molybdenum, silicon carbide, stainless steel, niobium, aluminum, nickel, nickel-containing compounds, titanium, and composites of metallic materials. Preferred susceptor materials include metals or carbon. Advantageously, the susceptor material may include or consist of ferromagnetic or ferrimagnetic materials, such as, for example, ferritic iron, ferromagnetic alloys (such as ferromagnetic steel or stainless steel), ferromagnetic particles, ferrites, and the like. A suitable susceptor material may be or include aluminum. The susceptor material may contain more than 5 percent, preferably more than 20 percent, more preferably more than 50 percent or more than 90 percent ferromagnetic, ferrimagnetic, or paramagnetic material. Preferred susceptor materials may be heated to temperatures in excess of 250 degrees Celsius without degradation.

[0078] The susceptor material may be formed from a single layer of material, which may be a layer of steel.

[0079] The susceptor material may comprise a non-metallic core having a metallic layer disposed thereon. For example, the susceptor material may comprise a ceramic core or a metallic track formed on the outer surface of the substrate.

[0080] The susceptor material may be formed from a layer of austenitic steel. One or more layers of stainless steel may be disposed on the layer of austenitic steel. For example, the susceptor material may be formed from a layer of austenitic steel having a layer of stainless steel on each of its upper and lower surfaces. The susceptor element may include a single susceptor material. The susceptor element may include a first susceptor material and a second susceptor material. The first susceptor material may be disposed in intimate physical contact with the second susceptor material. The first and second susceptor materials may be in intimate contact to form a single susceptor that cannot be disassembled. In certain embodiments, the first susceptor material is stainless steel and the second susceptor material is nickel. The susceptor element may have a bi-layer structure. The susceptor element may be formed from a stainless steel layer and a nickel layer.

[0081] The intimate contact between the first and second susceptor materials may be achieved by any suitable means. For example, the second susceptor material may be plated, deposited, coated, clad, or welded onto the first susceptor material. Preferred methods include electroplating, galvanizing, and cladding.

[0082] The aerosol generating device may include a power source for powering the heating element. The power source may comprise a battery. The power source may be a lithium-ion battery. Alternatively, the power source may be a nickel metal hydride battery, a nickel cadmium battery, or a lithium-based battery (e.g., a lithium cobalt battery, a lithium iron phosphate battery, a lithium titanate battery, or a lithium polymer battery). The power source may require recharging and may have a capacity that allows for storage of sufficient energy for one or more use experiences. For example, the power source may have a capacity sufficient to continuously generate aerosol for about six minutes, or a multiple of six minutes. In another embodiment, the power source may have a capacity sufficient to provide a predetermined number of puffs, or discontinuous activation of the heating element.

[0083] The power source may be a direct current (DC) power source. In one embodiment, the power source is a DC power source having a DC supply voltage in the range of 2.5 volts to 4.5 volts and a DC supply current in the range of 1 amp to 10 amps (corresponding to a DC power source in the range of 2.5 watts to 45 watts). The aerosol generating device may advantageously comprise a direct current to alternating current (DC / AC) inverter for converting the DC current provided by the DC power source to an alternating current. The DC / AC converter may comprise a class D, class C, or class E power amplifier. The AC power output of the DC / AC converter is provided to the induction coil.

[0084] The power source may be adapted to supply power to the inductor coil and may be configured to operate at high frequencies. For operation at high frequencies, a class E power amplifier is preferred. As used herein, the term "high frequency oscillating current" refers to an oscillating current having a frequency between 500 kilohertz and 30 megahertz. The high frequency oscillating current may have a frequency between 1 megahertz and 30 megahertz, preferably between 1 megahertz and 10 megahertz, and more preferably between 5 megahertz and 8 megahertz.

[0085] In alternative embodiments, the switching frequency of the power amplifier may be in the lower kHz range, for example 100 kHz to 400 KHz. In embodiments where class D or class C power amplifiers are used, switching frequencies in the lower kHz range are particularly advantageous.

[0086] The aerosol generating device may comprise a controller. The controller may be electrically connected to the inductor coil. The controller may be electrically connected to the first induction coil and to the second induction coil. The controller may be configured to control the current supplied to the induction coil and therefore the magnetic field strength generated by the induction coil.

[0087] A power source and a controller may be connected to the inductor coil.

[0088] The controller may be configured to chop the current supply on the input side of the DC / AC converter, so that the power supplied to the inductor coil can be controlled by conventional methods of duty cycle management.

[0089] The following provides a non-exhaustive list of non-limiting examples, any one or more of the features of which may be combined with any one or more features of the other examples, embodiments, or aspects described herein.

[0090] Example A: A cartridge for use with an aerosol generating device, comprising: a hollow tubular susceptor arrangement; a hollow tubular core element coaxially surrounding the susceptor arrangement; a hollow tubular liquid reservoir coaxially surrounding the core element.

[0091] Example B: A cartridge as described in Example A with an airflow path extending along the central longitudinal axis of the hollow tubular susceptor arrangement.

[0092] Example C: A cartridge as described in Example A or Example B comprising a susceptor arrangement and a first sealing element disposed at a first end of the core element.

[0093] Example D: A cartridge according to example C, wherein the first sealing element is formed as a sealing disk.

[0094] Example E: The cartridge of example C or example D, wherein the first sealing element has a concave, convex, or corrugated outer wall.

[0095] Example F: A cartridge according to any of Examples C to E, comprising a susceptor arrangement and a second sealing element arranged at a second end opposite the core element, preferably the second sealing element having the same shape as the first sealing element.

[0096] Example G: A cartridge according to any of Examples A-F, wherein the wall of the hollow tubular susceptor arrangement comprises a slit extending from the proximal end to the distal end of the wall of the hollow tubular susceptor arrangement.

[0097] Example H: A cartridge according to any of Examples A to G, wherein the wall of the susceptor arrangement is fluid permeable, preferably the wall of the susceptor arrangement comprises perforations.

[0098] Example I: A cartridge described in any of Examples A to H, wherein the wall of the susceptor arrangement has a slit extending along the axial direction from the proximal end to the distal end of the wall of the susceptor arrangement, or the wall of the susceptor arrangement has a slit extending along a direction angled relative to the axial direction from the proximal end to the distal end of the wall of the susceptor arrangement.

[0099] Example J: The cartridge of example H or example I, wherein the susceptor arrangement comprises a porous carbon-based material or the susceptor arrangement comprises a perforated ferromagnetic alloy material.

[0100] Example K: The cartridge of any of Examples A-H, wherein the susceptor arrangement comprises a first hollow tubular susceptor element coaxially surrounding a second hollow tubular susceptor element.

[0101] Example L: A cartridge as described in example K, wherein one or both of the walls of the first hollow tubular susceptor element and the second hollow tubular susceptor element have a slit extending from the proximal end to the distal end of the wall of each hollow tubular susceptor element.

[0102] Example M: ​​A cartridge described in Example L, wherein the wall of the first hollow tubular susceptor element has a slit extending along the axial direction from the proximal end to the distal end of the wall of the first hollow tubular susceptor element, and the wall of the second hollow tubular susceptor element has a slit extending along a direction angled relative to the axial direction from the proximal end to the distal end of the wall of the second hollow tubular susceptor element, or vice versa.

[0103] Example N: A cartridge described in any of Examples K-M, wherein the first hollow tubular susceptor element comprises a porous carbon-based material and the second hollow tubular susceptor element comprises a perforated ferromagnetic alloy material, or vice versa.

[0104] Example O: A cartridge according to any of Examples A to N, wherein the susceptor arrangement, or at least the hollow tubular susceptor element of the susceptor arrangement, is porous, the core element is porous, and the porosity of the core element is in the range of 30% to 80%, preferably 40% to 70%, more preferably 50% to 60%, and the porosity of the susceptor arrangement, or at least the hollow tubular susceptor element of the susceptor arrangement, is in the range of 25% to 80%, preferably 55% to 75%, more preferably 65% ​​to 75%.

[0105] Example P: The cartridge of example O, wherein the porosity of the susceptor arrangement, or at least the porosity of the hollow tubular susceptor element of the susceptor arrangement, is greater than the porosity of the core element.

[0106] Example Q: A cartridge according to any of Examples A to P, wherein the core element is a monolithic element.

[0107] Example R: A cartridge described in any of Examples A-Q, wherein the length of the core element is in the range of 3.9 millimeters to 20 millimeters, preferably 4.1 millimeters to 15 millimeters, and the outer diameter of the core element is in the range of 2.3 millimeters to 7.1 millimeters, preferably 2.7 millimeters to 4.7 millimeters.

[0108] Example S: A cartridge according to any of Examples A-R, wherein the inner diameter of the core element ranges from 0.7 millimeters to 4.6 millimeters, preferably from 1.0 millimeters to 3.5 millimeters.

[0109] Example T: A cartridge according to any of Examples A to S, wherein the length of the susceptor arrangement differs from the length of the core element by less than 10%, preferably less than 5%, more preferably less than 2%, and most preferably less than 1%.

[0110] Example U: A cartridge described in any of Examples A to T, wherein the fluid-permeable portion of the inner wall of the liquid storage portion is in direct physical contact with the outer wall of the core element, thereby enabling the liquid aerosol-forming substrate to transfer from the liquid storage portion to the core element.

[0111] Example V: A cartridge according to any one of Examples A to U, wherein the cartridge has a cylindrical shape and an outer diameter of the cartridge is from 5 millimeters to 10 millimeters, preferably from 6 millimeters to 8 millimeters.

[0112] Example W: A cartridge according to any of Examples A-V, wherein the outer diameter of the hollow tubular susceptor arrangement is 80%-99% of the inner diameter of the hollow tubular core element.

[0113] Example X: A cartridge according to any of Examples A-W, wherein the outer diameter of the hollow tubular core element is smaller than the inner diameter of the hollow tubular liquid storage portion.

[0114] Example Y: A cartridge according to any of Examples A to X, wherein the outer diameter of the hollow tubular core element is 80% to 99% of the inner diameter of the hollow tubular liquid storage portion.

[0115] Example Z: A cartridge as described in example Y, wherein the outer diameter of the hollow tubular core element is between 2.3 millimeters and 7.1 millimeters, preferably between 2.7 millimeters and 4.7 millimeters, and the inner diameter of the hollow tubular liquid storage portion is between 2.4 millimeters and 8 millimeters, preferably between 2.8 millimeters and 5.0 millimeters.

[0116] Example ZA: A cartridge according to any one of Examples A to Z, comprising a mouthpiece.

[0117] Example ZB: A cartridge according to any one of Examples A to ZA; An aerosol generating system comprising: an aerosol generating device comprising a heating chamber for receiving a cartridge; and an inductor coil at least partially surrounding the heating chamber for inductively heating the cartridge.

[0118] Example ZC: A method of manufacturing a cartridge for an aerosol generating device, comprising: providing a core and susceptor assembly comprising a hollow tubular susceptor arrangement and a hollow tubular core element coaxially surrounding the susceptor arrangement; and inserting the wick and susceptor assembly into the hollow tubular liquid storage portion such that the hollow tubular liquid storage portion coaxially surrounds the wick and susceptor assembly.

[0119] Example ZD: the susceptor arrangement includes at least one flexible sheet including a susceptor material; The method of embodiment ZC, wherein the step of providing a core and susceptor assembly includes bending a sheet to form a hollow tubular susceptor element and inserting the hollow tubular susceptor element into the hollow tubular core element.

[0120] Example ZE: Prior to the step of inserting the wick and susceptor assembly into the hollow tubular liquid storage section, attaching a first sealing disk to a first end of the core and susceptor assembly; The method of embodiment ZE or embodiment ZD including attaching a second sealing disk to the second end of the core and susceptor assembly.

[0121] Features described with respect to one embodiment may be equally applied to other embodiments of the invention.

[0122] The invention will now be further described, by way of example only, with reference to the accompanying drawings in which: [Brief description of the drawings]

[0123] [Figure 1] Figures 1a-1d show the susceptor and wick assembly of the cartridge. [Diagram 2] 2a and 2b show a susceptor element. [Diagram 3] Figures 3a and 3b show a cartridge. [Figure 4] Figures 4a and 4b illustrate the operating principle of the cartridge. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0124] Figures 1a-1d show perspective views of a susceptor and wick assembly 10 comprising a hollow tubular susceptor arrangement 12 and a hollow tubular wick element 14 coaxially surrounding the susceptor arrangement 12. Each of the susceptor and wick assemblies 10 of Figures 1a-1d is a subunit of a cartridge for an aerosol generating device.

[0125] The inner diameter of the hollow tubular core element 14 may be between 0.7 mm and 4.6 mm, preferably between 1.0 mm and 3.5 mm. The outer diameter of the hollow tubular core element 14 may be between 2.3 mm and 7.1 mm, preferably between 2.7 mm and 4.7 mm. The length of the hollow tubular core element 14 may be between 3.9 mm and 17 mm, preferably between 4.1 mm and 14 mm.

[0126] Fig. 1b shows the susceptor and core assembly 10 brought into the vicinity of a sealing element. A first sealing element is disposed adjacent to a first end of the susceptor arrangement 12 and a core element 14 attached to said first end. The first sealing element is formed as a sealing disk 16. A second sealing element is disposed adjacent to a second end of the susceptor arrangement 12 and a core element 14 attached to said second end. The second sealing element is formed as a sealing disk 18. The sealing disks 16, 18 have the shape of a flattened hollow tubular cylinder.

[0127] 1c shows an attached configuration in which sealing disks 16, 18 are attached to first and second ends, respectively, of the susceptor arrangement 12 and the core element 14. The length "N" of the susceptor and core assembly 10 with the attached sealing disks 16, 18 may be between 4.5 millimeters and 31 millimeters, preferably between 5.7 millimeters and 17 millimeters.

[0128] FIG. 1d shows a cross-sectional view of the sealing disks 16, 18 at their top. The inner diameter "L" of the sealing disks 16, 18 may be between 0.9 mm and 4.9 mm, preferably between 1.1 mm and 3.7 mm. The outer diameter "M" of the sealing disks 16, 18 may be between 2.5 mm and 7.5 mm, preferably between 2.9 mm and 5.1 mm. The height "K" of the sealing disks 16, 18 may be between 0.7 mm and 4.1 mm, preferably between 0.9 mm and 2.7 mm.

[0129] The outer wall of one or both of the sealing disks 16, 18 may not be flat. The enlarged portion of the outer wall at the bottom of FIG. 1d shows a suitable non-flat surface profile of the outer wall of one or both of the sealing disks 16, 18. For example, the outer wall of the sealing disk may have a concave shape 20, a corrugated shape 22, or a convex shape 24. Thereby, the sealing effect may be promoted when the susceptor and wick assembly 10 is inserted into the hollow tubular liquid storage portion to form a cartridge. Thereby, the frictional forces during the insertion of the susceptor and wick assembly 10 into the hollow tubular liquid storage portion. The sealing and mechanical insertion may be optimized.

[0130] The top of FIG. 2a shows a rectangular sheet of a first susceptor material that can be rolled to form a first hollow tubular susceptor element 26 of the hollow tubular susceptor arrangement 12, as indicated by the arrow. The bottom of FIG. 2a shows an enlarged view of the first hollow tubular susceptor element 26. The wall of the first hollow tubular susceptor element 26 includes a slit 28 extending from a proximal end to a distal end of the wall of the first hollow tubular susceptor element 26. The slit 28 extends axially from a proximal end to a distal end of the wall of the first hollow tubular susceptor element 26. The width of the slit 28 may be between 0.15 millimeters and 2.1 millimeters, preferably between 0.17 millimeters and 1.7 millimeters. The first hollow tubular susceptor element 26 may be made of a porous carbon-based material, such as magnetic graphene. The outer diameter "C" of the first hollow tubular susceptor element 26 may be between 0.8 mm and 4.7 mm, preferably between 1.2 mm and 3.7 mm. The wall thickness "A" of the first hollow tubular susceptor element 26 may be between 0.35 mm and 3.7 mm, preferably between 0.7 mm and 2.5 mm. The wall length "H" of the first hollow tubular susceptor element 26 may be between 3.9 mm and 20 mm, preferably between 4.7 mm and 14 mm.

[0131] The top of FIG. 2b shows a diamond-shaped sheet of a second susceptor material that can be rolled to form a second hollow tubular susceptor element 30 of the hollow tubular susceptor arrangement 12, as indicated by the arrow. The bottom of FIG. 2b is an enlarged view of the second hollow tubular susceptor element 30. The wall of the second hollow tubular susceptor element 30 includes a slit 32 extending from the proximal end to the distal end of the wall of the second hollow tubular susceptor element 30. The slit 32 extends along a direction angled with respect to the axial direction from the proximal end to the distal end of the wall of the second hollow tubular susceptor element 30. The width of the slit 32 may be between 0.15 millimeters and 2.1 millimeters, preferably between 0.17 millimeters and 1.7 millimeters. The second hollow tubular susceptor element 30 may be made of a perforated susceptor material, for example, a stainless steel alloy, such as 304 stainless steel or 410 stainless steel. The perforations 34 may be introduced, for example, by laser etching or embossing a sheet of susceptor material.

[0132] The outer diameter "D" of the second hollow tubular susceptor element 30 may be between 0.9 mm and 4.9 mm, preferably between 1.2 mm and 3.7 mm. The wall thickness "B" of the second hollow tubular susceptor element 30 may be between 0.11 mm and 0.8 mm, preferably between 0.2 mm and 0.7 mm. The wall length "I" of the second hollow tubular susceptor element 30 may be between 3.9 mm and 21 mm, preferably between 4.7 mm and 15 mm.

[0133] A hollow tubular susceptor arrangement 12 suitable for use in the cartridges described herein may include only one of the first hollow tubular susceptor element 26 and the second hollow tubular susceptor element 30 .

[0134] A hollow tubular susceptor arrangement 12 suitable for use in the cartridges described herein may include both a first hollow tubular susceptor element 26 and a second hollow tubular susceptor element 30. The first hollow tubular susceptor element 26 may coaxially surround the second hollow tubular susceptor element 30, or the second hollow tubular susceptor element 30 may coaxially surround the first hollow tubular susceptor element 26. In such an embodiment, the angled orientation of slit 32 relative to slit 30 may prevent the two slits from accidentally aligning during manufacture.

[0135] 3a shows the susceptor and wick assembly 10 brought into proximity with a hollow tubular liquid reservoir 36 for insertion therein, as indicated by the arrow. The hollow tubular liquid reservoir 36 comprises a fluid permeable portion 38 of the inner wall of the liquid reservoir 36.

[0136] Figure 3b shows the susceptor and wick assembly 10 inserted into a hollow tubular liquid storage portion 36, thus forming a cartridge for use with an aerosol generating device. The cartridge therefore comprises a hollow tubular liquid storage portion 34 coaxially surrounding a wick element 14. The liquid storage portion 36 in Figure 3b is filled with a liquid aerosol-forming substrate 40. A fluid permeable portion 38 of the inner wall of the liquid storage portion 36 is in direct physical contact with the outer wall of the wick element 12, thereby allowing the liquid aerosol-forming substrate 40 to move from the liquid storage portion 36 to the wick element 12.

[0137] Figures 4a and 4b illustrate the operating principle of the cartridge of Figure 3b.

[0138] FIG. 4a shows the cartridge inserted into the heating chamber of an aerosol generating device with an inductor coil arrangement 42. In use, the inductor coil is supplied with an alternating current to generate an alternating magnetic field, which in turn heats the susceptor arrangement 12. Ambient air 44 enters the aerosol generating device through its one or more air inlets, passes through an airflow path, and enters the cartridge at its distal or upstream end. The liquid aerosol-forming substrate 40 evaporates due to heat generated by the susceptor arrangement 12. The volatilized particles are entrained by the airflow, and the aerosol 46 exits the internal channel of the hollow liquid storage portion 36 at its proximal or downstream end. The aerosol may then travel further along the airflow path towards the mouth end of the device or the mouth end of the cartridge, where it may be inhaled by the user.

[0139] FIG. 4b shows an enlarged portion of the area enclosed by the dotted rectangle in FIG. 4a. The portion 48 of the inner wall of the liquid storage portion 36 that is not in contact with the core element 14 is fluid impermeable. However, in the region of the fluid permeable portion 38 of the inner wall of the liquid storage portion 36, the liquid aerosol-forming substrate 40 can migrate through the wall 38 into and through the hollow tubular core element 14. The liquid aerosol-forming substrate 40 further migrates into and through the fluid permeable wall of the susceptor assembly 12. When the susceptor assembly 12 is heated by the alternating magnetic field generated by the inductor coil, volatilization of the liquid aerosol-forming substrate 40 can occur on the inner surface of the hollow tubular susceptor arrangement 12. The volatilization is exemplarily shown by a volatilization spot 50. The volatilized particles may then be entrained by an airflow 44 that enters the hollow inner tubular core of the cartridge, and an airflow 46 containing the volatilized particles from the liquid aerosol-forming substrate travels toward the proximal end of the cartridge, exits the cartridge, and may travel further toward the oral end of the aerosol generating device, or the oral end of the cartridge, where the mature aerosol may be inhaled by a user.

Claims

1. 1. A cartridge for use with an aerosol generating device, comprising: a hollow tubular susceptor arrangement; a hollow tubular core element coaxially surrounding the susceptor arrangement; a hollow tubular liquid reservoir coaxially surrounding said core element.

2. The cartridge of claim 1 , comprising an airflow path extending along a central longitudinal axis of the hollow tubular susceptor arrangement.

3. 3. The cartridge of claim 1 or claim 2, comprising a first sealing element disposed at a first end of the susceptor arrangement and the core element, and a second sealing element disposed at an opposite second end of the susceptor arrangement and the core element, each of the sealing elements being formed as a sealing disk, and each of the sealing elements having a concave, convex, or corrugated outer wall.

4. The cartridge of claim 1 , wherein a wall of the hollow tubular susceptor arrangement comprises a slit extending from a proximal end to a distal end of the wall of the hollow tubular susceptor arrangement.

5. The cartridge of claim 1 , wherein the walls of the susceptor arrangement are fluid permeable, preferably the walls of the susceptor arrangement include perforations.

6. The cartridge of claim 1, wherein the wall of the susceptor arrangement has a slit extending along the axial direction from the proximal end to the distal end of the wall of the susceptor arrangement, or the wall of the susceptor arrangement has a slit extending along a direction angled with respect to the axial direction from the proximal end to the distal end of the wall of the susceptor arrangement.

7. 7. A cartridge according to claim 5 or claim 6, wherein the susceptor arrangement comprises a porous carbon-based material, or wherein the susceptor arrangement comprises a perforated ferromagnetic alloy material.

8. 2. The cartridge of claim 1, wherein the susceptor arrangement, or at least the hollow tubular susceptor element of the susceptor arrangement, is porous, the core element is porous, the porosity of the core element is in the range of 30% to 80%, preferably 40% to 70%, more preferably 50% to 60%, the porosity of the susceptor arrangement, or at least the hollow tubular susceptor element of the susceptor arrangement, is in the range of 25% to 80%, preferably 55% to 75%, more preferably 65% ​​to 75%, and the porosity of the susceptor arrangement, or at least the hollow tubular susceptor element of the susceptor arrangement, is greater than the porosity of the core element.

9. 10. The cartridge of claim 1, wherein the fluid-permeable portion of the inner wall of the liquid storage portion is in direct physical contact with the outer wall of the core element, thereby allowing the liquid aerosol-forming substrate to transfer from the liquid storage portion to the core element.

10. 2. The cartridge of claim 1, wherein the cartridge has a cylindrical shape and an outer diameter of the cartridge is between 5 mm and 10 mm, preferably between 6 mm and 8 mm.

11. The cartridge of claim 1, wherein the outer diameter of the hollow tubular susceptor arrangement is 80% to 99% of the inner diameter of the hollow tubular core element.

12. The cartridge of claim 1 , wherein the outer diameter of the hollow tubular core element is smaller than the inner diameter of the hollow tubular liquid reservoir portion.

13. 13. The cartridge of claim 12, wherein the outer diameter of the hollow tubular core element is 80% to 99% of the inner diameter of the hollow tubular liquid storage portion, the outer diameter of the hollow tubular core element is 2.3 mm to 7.1 mm, preferably 2.7 mm to 4.7 mm, and the inner diameter of the hollow tubular liquid storage portion is 2.4 mm to 8 mm, preferably 2.8 mm to 5.0 mm.

14. 10. The cartridge of claim 1, wherein the hollow tubular liquid reservoir is configured as a container or reservoir for storing the liquid aerosol-forming substrate.

15. The cartridge according to claim 1; an aerosol generating device comprising a heating chamber for receiving the cartridge, and an inductor coil at least partially surrounding the heating chamber for inductively heating the cartridge.

16. 1. A method for manufacturing a cartridge for an aerosol generating device, comprising: providing a core and susceptor assembly comprising a hollow tubular susceptor arrangement and a hollow tubular core element coaxially surrounding said susceptor arrangement; and inserting the wick and susceptor assembly into a hollow tubular liquid reservoir such that the hollow tubular liquid reservoir coaxially surrounds the wick and susceptor assembly.

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