An aerosol-generating article comprising a primary reservoir and a capillary buffer reservoir

Abstract

The present invention relates to an aerosol-generating article for use with an aerosol-generating device. The article comprises a main reservoir for storing an aerosol-forming liquid, and a capillary buffer reservoir in fluid communication with the main reservoir for storing the aerosol-forming liquid due to capillary action. The article further comprises a liquid conduit in fluid communication with at least the capillary buffer reservoir for providing the aerosol-forming liquid to an outside of the capillary buffer reservoir and the main reservoir at an interface. The present invention further relates to an aerosol-generating system comprising such an article and an aerosol-generating device for use with the article.

Description

Technical Field

[0001] This disclosure relates to an aerosol generating article for use with an aerosol generating apparatus, the article comprising at least one liquid reservoir for storing aerosol-forming liquid. This disclosure further relates to an aerosol generating system comprising this article and an aerosol generating apparatus for use with the article. Background Technology

[0002] Generating inhalable aerosols by heating aerosols to form liquids is known in the art. For this purpose, a liquid aerosol-forming matrix can be transported from a liquid reservoir to an area outside the reservoir via a liquid conduit (e.g., a wicking element). There, the liquid can be evaporated by a heater and subsequently exposed to an air path, thereby forming an inhalable aerosol. Both the liquid reservoir and the liquid conduit can be part of an aerosol-generating article configured to be inserted into an aerosol-generating device so that the aerosol-forming liquid stored in the article evaporates.

[0003] Practice has shown that aerosol generation using such systems sometimes fails to function reliably. In particular, aerosol generation can depend on the user's hand position while holding the aerosol generation system during operation.

[0004] Therefore, it is desirable to have aerosol generating articles and systems for generating aerosols from aerosol-forming liquids, which possess the advantages of existing technological solutions while mitigating their limitations. In particular, it is desirable to have aerosol generating articles and systems for reliably generating aerosols from aerosol-forming liquids. Summary of the Invention

[0005] According to the present invention, an aerosol generation article for use with an aerosol generation apparatus is provided. The article includes a main reservoir for storing an aerosol-forming liquid, and a capillary buffer reservoir in fluid communication with the main reservoir for storing the aerosol-forming liquid due to capillary action. The article further includes a liquid conduit in fluid communication with at least the capillary buffer reservoir, the liquid conduit being used to provide the aerosol-forming liquid to the outside of the capillary buffer reservoir and the main reservoir at an interface.

[0006] According to the present invention, it has been found that aerosol generation is defective in many systems because the liquid conduit is only properly immersed in the aerosol-forming liquid at certain locations. However, in some locations, such as when the aerosol generation system is inverted, the aerosol-forming liquid can shift within the reservoir, causing the liquid conduit to no longer be in contact with the liquid. As a result, delivery of the aerosol-forming liquid to the evaporation zone outside the reservoir is interrupted, causing aerosol formation to rapidly decrease or even cease. Furthermore, due to the lack of aerosol-forming liquid, the liquid conduit can overheat in the evaporation zone, which in turn can lead to the generation of hazardous components from the aerosol-forming liquid or the product material.

[0007] To remedy this situation, the present invention proposes the use of a small-volume capillary buffer reservoir in fluid communication with both the main reservoir and the liquid conduit. The buffer reservoir is configured to store aerosol-forming liquid due to capillary action, thereby reliably supplying a sufficient amount of aerosol-forming liquid to the liquid conduit in fluid communication with the buffer reservoir, independent of the article's position. In this respect, it has been found that if the volume of the capillary buffer reservoir is chosen to be sufficiently small, the capillary effect will outweigh gravity. As a result, once the aerosol-forming liquid fills the buffer reservoir, especially when the orientation of the article changes, for example, from a substantially upright position to a substantially horizontal position, or even to an inverted position, the aerosol-forming liquid is prevented from flowing back into the main reservoir. Essentially, the capillary buffer reservoir of the aerosol-generating article according to the invention functions similarly to the buffer reservoir of a pen.

[0008] Theoretically, capillary lengths are expected to vary considerably for liquids with different surface tensions and densities. However, in practice, for most liquids, capillary lengths are generally a few millimeters. This narrow range of capillary lengths for different liquids is due in particular to surface defects, contact hysteresis, and surface cleanliness. Therefore, the size of the capillary buffer reservoir can be selected such that the maximum dimension between the two opposing walls defining at least a portion of the capillary buffer reservoir is between 0.2 mm and 5 mm, particularly between 0.5 mm and 3 mm, and preferably between 1 mm and 2.5 mm. These values ​​ensure sufficient capillary action while still providing a sufficiently large buffer volume to store a sufficient amount of aerosol-forming liquid. In particular, it has been found that it is sufficient if only one dimension of the buffer reservoir is smaller than the effective capillary length. In particular, the capillary action of the buffer reservoir can be attributed to a maximum dimension between two opposing walls that define at least a portion of the capillary buffer reservoir, ranging from 0.2 mm to 5 mm, particularly from 0.5 mm to 3 mm, and preferably from 1 mm to 2.5 mm.

[0009] The capillary buffer reservoir can have a total volume of up to 60 cubic millimeters, particularly up to 50 cubic millimeters, preferably up to 40 cubic millimeters, more preferably up to 30 cubic millimeters, and most preferably up to 20 cubic millimeters. These volumes still ensure proper capillary action.

[0010] Conversely, the total volume of the capillary buffer reservoir can be at least 5 cubic millimeters, particularly at least 10 cubic millimeters, and preferably at least 15 cubic millimeters. These volumes are still large enough to capture and provide a sufficient amount of aerosol-forming liquid in the capillary buffer reservoir for at least several pumping operations.

[0011] The capillary buffer reservoir comprises a sheet structure. The use of a sheet structure advantageously increases the inner surface area of ​​the buffer reservoir, and thus enhances capillary action. The sheet structure essentially functions similarly to the sheet structure in a fountain pen.

[0012] In particular, the sheet structure may include multiple sheets. These sheets may be arranged adjacent to each other, particularly in a side-by-side configuration spaced apart from each other. As generally discussed above regarding the maximum dimension between opposing walls of the buffer reservoir, the maximum dimension between adjacent sheets may advantageously range between 0.2 mm and 5 mm, particularly between 0.5 mm and 2.5 mm, and preferably between 1 mm and 2 mm.

[0013] Specifically, the buffer reservoir may contain no capillary material and / or liquid-retaining material. More specifically, unless filled with an aerosol-forming liquid, the buffer reservoir may be a cavity or an empty space.

[0014] Generally, the main reservoir and the capillary buffer reservoir can be fluidly connected to each other in different ways.

[0015] For example, the main collector can be directly connected to the capillary buffer collector. That is, the main collector and the capillary buffer collector together can form a combined collector, wherein each of the main collector and the capillary buffer collector forms a part of it. Advantageously, this configuration is easy to manufacture and inexpensive.

[0016] As another example, the main reservoir and the capillary buffer reservoir may be in fluid communication with each other via at least a first liquid channel. In this configuration, the main reservoir and the capillary buffer reservoir are separate from each other and are fluidly connected only by at least the first liquid channel. Advantageously, particularly when capillary action is temporarily insufficient to properly retain the aerosol-forming liquid within the capillary buffer reservoir, this configuration can delay the return of the aerosol-forming liquid from the capillary buffer reservoir to the main reservoir.

[0017] The first liquid channel can be configured such that the liquid flow passing through the article is deflected by at least 90 degrees, and particularly by 180 degrees. This allows for a compact design of aerosol-generating articles with main reservoirs and capillary buffer reservoirs arranged adjacent to each other.

[0018] In addition to the first liquid channel, the main reservoir and the capillary buffer reservoir are also in fluid communication with each other at least via a second liquid channel. The second channel facilitates, and particularly accelerates, the refilling of the capillary buffer reservoir from the main reservoir, as the aerosol-forming liquid in the capillary buffer reservoir is depleted via the liquid conduit during or after the aerosol generation system is in use.

[0019] Advantageously, at least one of the first and second fluid channels can also be used as a capillary buffer for the aerosol-forming liquid. Therefore, the maximum dimension between the two opposing walls defining at least a portion of at least one of the first or second fluid channels can range from 0.2 mm to 5 mm, particularly from 0.5 mm to 4 mm, preferably from 1 mm to 3 mm, and most preferably from 2 mm to 3 mm. In particular, the diameter of at least one of the first and second fluid channels can range from 0.2 mm to 5 mm, particularly from 0.5 mm to 4 mm, preferably from 1 mm to 3 mm, and most preferably from 2 mm to 3 mm.

[0020] Regarding the liquid flow through the article, the capillary buffer reservoir is preferably located downstream of the main reservoir. Similarly, regarding the liquid flow through the article, the liquid conduit is preferably located downstream of the capillary buffer reservoir.

[0021] Furthermore, regarding the liquid flow through the article, at least a portion of the fluid conduit is arranged in or within the downstream portion of the capillary buffer reservoir. Advantageously, this arrangement ensures that the liquid conduit is properly immersed in the aerosol-forming liquid captured in the capillary buffer reservoir. This, in turn, ensures the proper delivery of the aerosol-forming liquid from the buffer reservoir to the main reservoir and a region outside the buffer reservoir where the aerosol-forming liquid can evaporate.

[0022] Specifically, the main reservoir, buffer reservoir, and heating zone can be sequentially fluidly connected.

[0023] As further mentioned above, the capillary buffer reservoir can be arranged adjacent to the main reservoir. This arrangement proves advantageous for the compact design of aerosol-generating articles, particularly for their short length. Given that the aerosol-generating articles according to the invention are preferably used with handheld aerosol-generating devices, a compact design is especially preferred.

[0024] Aerosol-generating articles can have a simple design. The article may have an article housing comprising a main reservoir and capillary buffer reservoirs. The housing is preferably a rigid housing comprising a liquid-impermeable material. As used herein, "rigid housing" means a self-supporting housing. The housing may comprise or be made of one of PEEK (polyetherketone), PP (polypropylene), PE (polyethylene), or PET (polyethylene terephthalate). PP, PE, and PET are particularly cost-effective and easy to mold, especially easy to extrude. The housing may also include flexible or collapsible sections. The housing may further include at least one vent for volume compensation.

[0025] Specifically, aerosol-generating articles may include partition walls that define at least a portion of both the main reservoir and the capillary buffer reservoir. This configuration further enhances the compactness of the article design. The partition walls may be part of the article housing.

[0026] Furthermore, it is possible for at least a portion of the main reservoir and at least a portion of the capillary buffer reservoir to be integrally formed with each other. This makes the manufacture of aerosol-generated articles particularly easy and inexpensive. For example, at least a portion of the main reservoir and the capillary buffer reservoir of the reservoir body can be integrally formed as an extruded reservoir body, particularly a single-piece extruded reservoir body.

[0027] To further enhance the delivery of the aerosol-forming liquid to the region outside the main reservoir and capillary buffer reservoir, the liquid conduit can also be directly fluid-connected to the main reservoir. In other words, the liquid conduit can be fluid-connected to both the capillary buffer reservoir and the main reservoir.

[0028] To fluidly connect the liquid conduit to the main reservoir, the aerosol generating article may include a bypass channel that provides direct fluid communication between the main reservoir and the fluid conduit to bypass the main reservoir.

[0029] Alternatively or additionally, the aerosol generating article may include three intersecting fluid channels, each of which is connected to one of the main reservoir, capillary buffer reservoir, and fluid conduit to provide nodal fluid communication between every two of the main reservoir, capillary buffer reservoir, and fluid conduit.

[0030] As described above, at least a portion of the fluid conduit may be disposed at or within the downstream portion of the capillary buffer reservoir. For this purpose, the liquid conduit may pass through a wall defining at least a portion of the capillary buffer reservoir. For example, the wall may be a separation wall or sleeve separating the capillary buffer reservoir from the evaporation zone. The evaporation zone may be a zone to which the aerosol-forming liquid is delivered by the liquid conduit, and in which the delivered aerosol-forming liquid evaporates when the article is used with the aerosol-generating apparatus. Thus, an aerosol-generating article may include an evaporation zone for evaporating the aerosol-forming liquid, particularly including an evaporation chamber.

[0031] To provide aerosol-forming liquid in the evaporation zone, a liquid conduit may enter or face the evaporation zone. As used herein, the term "facing the evaporation chamber" refers to a configuration in which the liquid conduit is in fluid communication with the evaporation zone but does not enter the evaporation zone.

[0032] Generally, the liquid conduit can have any shape and configuration suitable for conveying from the capillary buffer reservoir to the evaporation zone. In particular, the liquid conduit may include a wicking element. The wicking element may be constructed as stranded wire, stranded material rope, net, mesh tube, several concentric mesh tubes, cloth, material sheet or sufficiently porous foam (or other porous solid), a roll of fine metal mesh or metal foil, fiber or some other arrangement of mesh, or any other geometry suitably sized and configured to perform the wicking action described herein.

[0033] Liquid conduits, particularly wicking elements, may include a bundle of filaments. Preferably, the bundle is an untwisted bundle. In an untwisted bundle, the filaments preferably extend adjacent to each other along the entire length of the bundle without crossing each other. Similarly, the bundle may include twisted portions, where the filaments are twisted together. Twisted portions enhance the mechanical stability of the bundle.

[0034] For example, a filament bundle may include a parallel bundle portion extending along at least a portion of its length, wherein multiple filaments may be arranged parallel to each other. The parallel bundle portion may be located at one end portion of the filament bundle or between two end portions of the filament bundle. Alternatively, the parallel bundle portion may extend along the entire length dimension of the filament bundle.

[0035] As another example, the filament bundle may include a first soaking section, a second soaking section, and an intermediate section between the first and second soaking sections. At least along the intermediate section, multiple filaments may be arranged parallel to each other. Regarding the specific construction of an article having a buffer reservoir and an evaporation zone, each of the first and second soaking sections may be at least partially arranged within the capillary buffer reservoir, while the intermediate section may be arranged in a region outside the capillary buffer reservoir, particularly within the evaporation zone.

[0036] Using filaments to transport liquids is particularly advantageous because filaments inherently provide capillary action. Furthermore, in a filament bundle, capillary action is further enhanced due to the narrow spaces formed between the multiple filaments during bundling. In particular, this applies to parallel arrangements of filaments, as the narrow spaces between the filaments do not change along the parallel arrangement, thus the capillary action is constant along the parallel arrangement.

[0037] Preferably, the filaments are solid material filaments. Solid material filaments are inexpensive and easy to manufacture. Additionally, solid material filaments provide good mechanical stability, thus making the filament bundle robust. Generally, the filaments can have any cross-sectional shape suitable for conveying aerosols to form liquids, especially when bundled. Therefore, the filaments can have circular, elliptical, oval, triangular, rectangular, square, hexagonal, or polygonal cross-sections. Preferably, the filaments have a substantially circular, oval, or elliptical cross-section. With this cross-section, the filaments are not in surface contact but only in line contact with each other, resulting in the self-formation of capillary spaces between multiple filaments.

[0038] Capillary action generally relies on the reduction of surface energy of the two independent surfaces of a filament (a liquid surface and a solid surface). Capillary action includes effects dependent on the radii of curvature of both the liquid surface and the filament. Therefore, a larger surface area and a smaller radius of curvature may be required, both of which can be achieved through a smaller diameter filament. Thus, multiple first filaments can have diameters of up to 0.025 mm, up to 0.05 mm, up to 0.1 mm, up to 0.15 mm, up to 0.2 mm, up to 0.25 mm, up to 0.3 mm, up to 0.35 mm, up to 0.4 mm, up to 0.45 mm, or up to 0.5 mm.

[0039] Generally, the filament bundle can be a linear bundle, that is, a substantially straight, non-curved, or non-bent bundle. This configuration does not preclude minor curvature of the bundle, that is, a large radius of curvature extending along the length of the bundle. As used herein, a large radius of curvature can include a radius of curvature 10 times larger than the total length of the bundle, particularly 20 times, 50 times, or especially 100 times larger. Alternatively, the bundle can be curved. In particular, the bundle can be substantially U-shaped, C-shaped, or V-shaped.

[0040] Multiple filaments can be surface-treated. In particular, the multiple filaments may include at least a portion of a surface coating, such as a fogging-enhancing surface coating, a liquid-adhesive surface coating, a liquid-repellent surface coating, or an antimicrobial surface coating. Fogging-enhancing surface coatings are advantageous in particularly improving the diversity of the user experience. Liquid-adhesive surface coatings can be advantageous in enhancing the capillary action of the filament bundle. Antimicrobial surface coatings can be used to reduce bacterial contamination. Liquid-repellent coatings, particularly at the ends of the filaments, can prevent liquid dripping.

[0041] Depending on the available space, the size of the filaments, and the amount of aerosol to be transported and heated to form a liquid, the filament bundle may include 3 to 100 filaments, particularly 10 to 80 filaments, preferably 20 to 60 filaments, more preferably 30 to 50 filaments, such as 40 filaments.

[0042] As another example, a liquid conduit may comprise two arrays of filaments that partially intersect each other. Specifically, the liquid conduit may comprise a longitudinal array of filaments arranged side-by-side, and a transverse array of filaments arranged side-by-side and intersecting the longitudinal array, the longitudinal array extending transversely to the length of the longitudinal filaments. The transverse array may extend only along the length of the longitudinal array, such that the liquid conduit comprises at least one mesh portion and at least one non-mesh portion. For example, the longitudinal array of filaments may have a substantially cylindrical shape, particularly a hollow cylindrical shape. As another example, the longitudinal array of filaments may have a substantially conical or substantially truncated conical shape, particularly a substantially hollow conical or substantially hollow truncated conical shape. In any of these configurations, the longitudinal filaments respectively form a cylindrical, conical, truncated conical, hollow cylindrical, hollow conical, or hollow truncated conical shell surface. The length axis of the respective shape extends substantially along the length of the longitudinal filaments. Advantageously, any of the above shapes provides inherent dimensional stability. In any of these configurations, the transverse array of filaments preferably has a substantially annular shape. In other words, the transverse filaments extend circumferentially within the grid portion of the receptor assembly along an array of longitudinal filaments that are cylindrical, conical, truncated conical, hollow cylindrical, hollow conical, or hollow truncated conical. Overall, the receptor assembly in any of the above configurations has a substantially crown-like shape. Furthermore, in the cases of conical, truncated conical, hollow conical, or hollow truncated conical shapes, the longitudinal filaments diverge from each other towards the base of the corresponding shape. Therefore, the array of longitudinal filaments that are conical, truncated conical, hollow conical, or hollow truncated conical helps to provide a fan-out portion.

[0043] Preferably, the liquid conduit may be inductively heated. For example, the liquid conduit may include or be one of an inductively heated filament bundle. Thus, the liquid conduit advantageously performs two functions: conveying and heating the aerosol-forming liquid. Advantageously, this dual function allows for a very material-saving and compact design of the liquid conduit without requiring separate devices for conveying and heating. Furthermore, there is direct thermal contact between the heat source (i.e., the liquid conduit) and the aerosol-forming liquid adhered thereto. Unlike the case where a heater contacts a saturated wick, the direct contact between the liquid conduit and a small amount of liquid advantageously allows for rapid heating, i.e., allows for rapid initiation of evaporation. In this sense, the liquid conduit can be considered as or includes a liquid transport sensor assembly. As used herein, the term "inductively heated" refers to a liquid conduit comprising a sensor material capable of converting electromagnetic energy into heat when subjected to an alternating magnetic field. Depending on the electrical and magnetic properties of the sensor material, this may be due to at least one of induced hysteresis losses or eddy currents in the sensor material. In ferromagnetic or ferrimagnetic sensor materials, hysteresis losses occur due to the switching of magnetic domains within the material under the influence of an alternating electromagnetic field. Eddy currents are induced in conductive sensor materials. In the case of conductive ferromagnetic or ferrimagnetic sensors, heat can be generated due to both eddy currents and hysteresis losses.

[0044] Therefore, the inductively heated liquid conduit may include at least a first sensor material. The first sensor material may include, or may be made of, a material that is conductive and at least one of ferromagnetic or ferrimagnetic. That is, the first sensor material may include, or may be made of, one of the following: a ferrimagnetic material, or a ferromagnetic material, or a conductive material, or a conductive ferrimagnetic material, or a conductive ferromagnetic material.

[0045] Additionally, the liquid conduit may include a second sensor material. While the first sensor material may be optimized for heat loss and thus for heating efficiency, the second sensor material may be used as a temperature marker. For this purpose, the second sensor material preferably comprises either a ferrimagnetic or ferromagnetic material. Specifically, the second sensor material may be selected to have a Curie temperature corresponding to a predefined heating temperature. At its Curie temperature, the magnetic properties of the second sensor material change from ferromagnetic or ferrimagnetic to paramagnetic, accompanied by a temporary change in its resistance. Therefore, by monitoring the corresponding change in the current absorbed by the sensing source, it is possible to detect when the second sensor material reaches its Curie temperature, and thus when the predetermined heating temperature is reached. Preferably, the first sensor material is different from the second sensor material. The second sensor material preferably has a Curie temperature below 500 degrees Celsius. Specifically, the second sensor material may have a Curie temperature below 350 degrees Celsius, preferably below 300 degrees Celsius, more preferably below 250 degrees Celsius, even more preferably below 200 degrees Celsius, and most preferably below 150 degrees Celsius. Preferably, the Curie temperature is selected such that it is below the boiling point at which the aerosol to be evaporated forms a liquid, in order to prevent the formation of harmful components in the aerosol.

[0046] In particular, the liquid conduit can be an inductively heated liquid conduit made entirely of one or more sensor materials.

[0047] For example, a liquid conduit may include multiple first filaments, which comprise or are made of a first receptor material. Additionally, the liquid conduit may include multiple second filaments, which comprise or are made of a second receptor material. Only a number of second filaments are needed for adequate use as a temperature marker. Therefore, the number of first filaments can be greater than the number of second filaments, specifically two, three, four, five, six, seven, eight, nine, or ten times greater. Preferably, the diameters of the first and second filaments should be greater than twice the skin depth to induce a sufficient amount of eddy currents upon exposure to an alternating magnetic field, and thus generate a sufficient amount of heat energy. Skin depth is a measure of the degree of electrical conduction that occurs in a conductive receptor material when induced heating. Therefore, depending on the materials used and the frequency of the alternating magnetic field, the first and second filaments can have diameters of at least 0.015 mm, at least 0.02 mm, at least 0.025 mm, at least 0.05 mm, at least 0.075 mm, at least 0.1 mm, at least 0.125 mm, at least 0.15 mm, at least 0.2 mm, at least 0.3 mm, or at least 0.4 mm. The second filament can be randomly distributed throughout the liquid conduit. Advantageously, random distribution requires only a small amount of effort during the manufacture of the liquid conduit.

[0048] The multiple first filaments and optional multiple second filaments described above can be used in any of the constructions of the liquid conduit described above, for example, in a filament bundle including at least one parallel bundle portion, in a filament bundle including two soaking sections and an intermediate portion, or in a liquid conduit including two arrays of filaments that partially intersect each other, such that at least one mesh portion and at least one non-mesh portion are formed.

[0049] In the case of inductively heated liquid conduits, they can be arranged off-center about the geometrical central axis of the aerosol-generating article. As a result, the liquid conduits can be arranged off-center about the axis of symmetry of the alternating magnetic field generated by the inductively heated aerosol-generating device, into which the aerosol-generating article can be inserted for heating the liquid conduits. Advantageously, due to the off-center arrangement (i.e., asymmetrical arrangement), the liquid conduits are positioned in a region of the alternating magnetic field with a higher field density compared to a symmetrical central arrangement. Consequently, heating efficiency is improved.

[0050] The aerosol generating article can be a single-use aerosol generating article or a reusable aerosol generating article. In the latter case, the aerosol generating article can be refillable. That is, the main reservoir can be refilled with aerosol-forming liquid. In any configuration, the aerosol generating article may further include aerosol-forming liquid contained in at least one of the main reservoir and the capillary buffer reservoir.

[0051] As used herein, the term "aerosol-forming liquid" refers to a liquid capable of releasing volatile compounds that can form aerosols when heated. Aerosol-forming liquids are intended to be heated. Aerosol-forming liquids may contain both solid and liquid aerosol-forming materials or components. Aerosol-forming liquids may include tobacco-containing materials containing volatile tobacco flavor compounds that are released from the liquid upon heating. Alternatively or additionally, aerosol-forming liquids may include non-tobacco materials. Aerosol-forming liquids may also include aerosol-forming agents. Examples of suitable aerosol-forming agents are glycerol and propylene glycol. Aerosol-forming liquids may also include other additives and ingredients, such as nicotine or flavorings. In particular, aerosol-forming liquids may include water, solvents, ethanol, plant extracts, and natural or artificial flavorings. Aerosol-forming liquids may be water-based or oil-based.

[0052] Additionally, the article may include a mouthpiece. As used herein, the term "mouthpiece" refers to a portion of the article placed in a user's mouth for direct inhalation of the aerosol agent. Preferably, the mouthpiece includes a filter. The filter can be used to filter out undesirable components of the aerosol. The filter may also include additional materials, such as flavoring materials to be added to the aerosol.

[0053] According to the present invention, an aerosol generation system is also provided, comprising an aerosol generation apparatus and an aerosol generation article according to the present invention and as described herein. The article is configured for use with the aerosol generation apparatus.

[0054] As used herein, the term "aerosol generating device" describes an electrically operated device capable of interacting with at least one aerosol generating article comprising at least one aerosol-forming liquid, such that an aerosol is generated by heating the aerosol-forming liquid within the article. Preferably, the aerosol generating device is a suction device for generating an aerosol that can be directly inhaled by a user through their mouth. In particular, the aerosol generating device is a handheld aerosol generating device.

[0055] The device may include a receiving cavity for removably receiving at least a portion of the aerosol-generated article.

[0056] Additionally, the aerosol generating apparatus may include an electric heating device. The heating device may be configured to heat the aerosol-forming liquid conveyed by a liquid conduit from a buffer reservoir (and, if applicable, from a main reservoir) to a region outside the buffer reservoir and the main reservoir (particularly to an evaporation zone as described above).

[0057] The heating device may be a resistance heating device, which includes a resistance heating element for heating the aerosol-forming liquid. The resistance heating element may be, for example, a heating wire or a heating coil. In use, when the aerosol-generating article is received in the aerosol-generating apparatus, the resistance heating element may be arranged in thermal contact or thermal proximity with the liquid conduit, particularly with a portion of the liquid conduit arranged in the evaporation zone of the aerosol-generating article.

[0058] Alternatively, the heating device may be an induction heating device. That is, the aerosol generating device may be an induction heating aerosol generating device. This configuration is particularly preferred when the liquid conduit of the article can be induction heated. Induction heating can also function when the aerosol generating article includes a (separate) sensor element arranged to be in thermal contact or proximity to the liquid conduit, particularly to a portion of the liquid conduit arranged in the evaporation zone of the aerosol generating article. The aerosol generating device itself may also include a sensor element arranged to be in thermal contact or proximity to the liquid conduit when the aerosol generating article is received in the aerosol generating device, particularly to a portion of the liquid conduit arranged in the evaporation zone of the aerosol generating article. In the latter configuration, that is, when the liquid conduit itself cannot be induction heated, the sensor element may be, for example, a sensor sleeve or sensor coil surrounding the liquid conduit, particularly arranged in a portion of the liquid conduit in the evaporation zone of the aerosol generating article.

[0059] An induction heating aerosol generating apparatus, particularly an induction heating apparatus, may include at least one induction source configured and arranged to generate an alternating magnetic field in a receiving cavity so that when an article is received in the aerosol generating apparatus, the induction heating aerosol generates an aerosol in the article to form a liquid.

[0060] To generate an alternating magnetic field, the induction source may include at least one inductor, preferably at least one induction coil arranged around the receiving cavity. In cases where the liquid conduit is inductively heated, the induction coil is arranged around the liquid conduit when the article is received in the receiving cavity, particularly around a portion of the liquid conduit in the evaporation zone of the aerosol-generating article.

[0061] At least one induction coil may be a helical coil or a flat planar coil, particularly a disc coil or a curved planar coil. The use of a flat helical coil allows for a robust and inexpensive compact design. The use of a helical induction coil advantageously allows for the generation of a uniform alternating magnetic field. As used herein, "flat helical coil" means a generally planar coil in which the axis of the coil winding is perpendicular to the surface on which the coil is situated. A flat helical induction coil may have any desired shape within the plane of the coil. For example, a flat helical coil may have a circular shape, or it may have a generally oblong or rectangular shape. However, when used herein, the term "flat helical coil" encompasses both planar coils and flat helical coils shaped to conform to curved surfaces. For example, the induction coil may be a "curved" planar coil arranged around the circumference of a preferably cylindrical coil support (e.g., a ferrite core). Moreover, a flat helical coil may comprise, for example, two four-turn flat helical coil layers or a single four-turn flat helical coil layer. The at least one induction coil may be held within either the body or the housing of the aerosol generating apparatus.

[0062] Aerosol-generating articles can be configured such that, when the article is received in the receiving chamber of an aerosol-generating device, an inductively heated liquid conduit (if present) is arranged off-center about the axis of symmetry of the alternating magnetic field generated by the induction source. As described above, due to the off-center arrangement (i.e., asymmetric arrangement), the liquid conduit is positioned in a region of the alternating magnetic field with a higher field density compared to an arrangement with a central symmetry. As a result, heating efficiency is improved.

[0063] The induction source may include an alternating current (AC) generator. This AC generator may be powered by the aerosol generating device. The AC generator is operatively coupled to at least one induction coil. Specifically, the at least one induction coil may be an integral part of the AC generator. The AC generator is configured to generate a high-frequency oscillating current passing through the at least one induction coil to generate an alternating magnetic field. The AC current may be continuously supplied to the at least one induction coil after system activation, or it may be supplied intermittently, such as on a per-port suction basis.

[0064] Preferably, the sensing source includes a DC / AC converter connected to a DC power supply comprising an LC network, wherein the LC network comprises a capacitor connected in series with an inductor.

[0065] The induction source is preferably configured to generate a high-frequency magnetic field. As mentioned herein, the high-frequency magnetic field can range from 500 kHz to 30 MHz, particularly from 5 MHz to 15 MHz, and preferably between 5 MHz and 10 MHz.

[0066] The aerosol generating apparatus may also include a controller configured, preferably in a closed-loop configuration, to control the operation of the heating process, particularly for controlling the heating of the aerosol-forming liquid to a predetermined operating temperature. The operating temperature for heating the aerosol-forming liquid can be between 100°C and 300°C, particularly in the range of 150°C and 250°C, for example, 230°C. These temperatures are typical operating temperatures for heating but not burning the aerosol-forming matrix.

[0067] The controller may be the overall controller of the aerosol generation device, or a part of the overall controller. The controller may include a microprocessor, such as a programmable microprocessor, microcontroller, or application-specific integrated circuit (ASIC), or other electronic circuitry capable of providing control. The controller may include additional electronic components, such as at least one DC / AC inverter and / or power amplifier, such as a Class C, Class D, or Class E power amplifier. In particular, the sensing source may be part of the controller.

[0068] The aerosol generation device may include a power source, particularly a DC power source configured to provide a DC power supply voltage and a DC power supply current to the sensing source. Preferably, the power source is a battery, such as a lithium iron phosphate battery. Alternatively, the power source may be another form of charge storage device, such as a capacitor. The power source may require charging; that is, the power source may be rechargeable. The power source may have a capacity that allows sufficient energy to be stored for one or more user experiences. For example, the power source may have sufficient capacity to allow continuous aerosol generation in time intervals of approximately six minutes or multiples of six minutes. In another example, the power source may have sufficient capacity to allow a predetermined number of suctions or discrete activation of the sensing source.

[0069] In the case of an induction-heated aerosol generating apparatus, the aerosol generating apparatus may further include a flux concentrator arranged around at least a portion of the induction coil and configured to distort the alternating magnetic field of at least one induction source toward the receiving cavity. Thus, when the article is received in the receiving cavity, the alternating magnetic field is distorted toward an inductively heated liquid conduit (if present). Preferably, the flux concentrator comprises a flux concentrator foil, particularly a plurality of thin-sheet flux concentrator foils.

[0070] Other features and advantages of the aerosol generation system according to the invention have been described with respect to the aerosol generation article according to the invention, and are therefore equally applicable.

[0071] The invention is defined in the claims. However, a non-exhaustive list of non-limiting embodiments is provided below. Any one or more features of these examples may be combined with any one or more features of another example, embodiment, or aspect described herein.

[0072] Example Ex1: An aerosol generating article for use with an aerosol generating apparatus, the article comprising:

[0073] A main reservoir for storing aerosol-forming liquids;

[0074] A capillary buffer reservoir in fluid communication with the main reservoir, the capillary buffer reservoir being used to store aerosol-forming liquids due to capillary action; and

[0075] A liquid conduit in fluid communication with at least the capillary buffer reservoir, the liquid conduit being used to provide aerosol-forming liquid to the outside of the capillary buffer reservoir and the main reservoir at the interface.

[0076] Example Ex2: An aerosol-generating article according to Example Ex1, wherein the maximum dimension between two opposing walls of at least a portion of the capillary buffer reservoir is defined as being between 0.2 mm and 5 mm, particularly between 0.5 mm and 3 mm, and preferably between 1 mm and 2.5 mm.

[0077] Example Ex3: An aerosol-generating article according to any of the foregoing examples, wherein the total volume of the capillary buffer reservoir is at most 60 cubic millimeters, particularly at most 50 cubic millimeters, preferably at most 40 cubic millimeters, more preferably at most 30 cubic millimeters, and most preferably at most 20 cubic millimeters.

[0078] Example Ex4: An aerosol-generating article according to any of the preceding examples, wherein the total volume of the capillary buffer reservoir is at least 5 cubic millimeters, particularly at least 10 cubic millimeters, and preferably at least 15 cubic millimeters.

[0079] Example Ex5: An aerosol-generating article according to any of the preceding examples, wherein the capillary buffer reservoir comprises a sheet structure.

[0080] Example Ex6: An aerosol-generated article according to Example Ex5, wherein the sheet structure comprises a plurality of sheets, wherein the maximum size between adjacent sheets ranges from 0.2 mm to 5 mm, particularly from 0.5 mm to 2.5 mm, and preferably from 1 mm to 2 mm.

[0081] Example Ex7: An aerosol-generating article according to any of the preceding examples, wherein the main reservoir is directly connected to the capillary buffer reservoir.

[0082] Example Ex8: An aerosol generating article according to any one of Examples Ex1 to Ex6, wherein the main reservoir and the capillary buffer reservoir are in fluid communication with each other via at least a first liquid channel.

[0083] Example Ex9: An aerosol-generated article according to Example Ex8, wherein the first liquid channel is configured such that the liquid flow through the article is diverted by at least 90 degrees, particularly by 180 degrees.

[0084] Example Ex10: An aerosol generating article according to any of the preceding examples, wherein the main reservoir and the capillary buffer reservoir are in fluid communication with each other via a second liquid channel.

[0085] Example Ex11: An aerosol-generating article according to any one of Examples Ex9 or Ex10, wherein a maximum dimension between two opposing walls of at least a portion of at least one of the first and second fluid channels is defined, particularly the diameter of at least one of the first and second fluid channels, ranging from 0.2 mm to 5 mm, particularly from 0.5 mm to 4 mm, preferably from 1 mm to 3 mm, and most preferably from 2 mm to 3 mm.

[0086] Example Ex12: An aerosol-generated article according to any of the preceding examples, wherein, with respect to the liquid flow through the article, the capillary buffer reservoir is downstream of the main reservoir.

[0087] Example Ex13: An aerosol-generating article according to any of the preceding examples, wherein, with respect to the liquid flow through the article, the liquid conduit is downstream of the capillary buffer reservoir.

[0088] Example Ex14: An aerosol-generating article according to any of the preceding examples, wherein, with respect to the liquid flow through the article, at least a portion of the fluid conduit is arranged at or within a downstream portion of the capillary buffer reservoir.

[0089] Example Ex15: An aerosol-generating article according to any of the preceding examples, wherein the capillary buffer reservoir is arranged adjacent to the main reservoir.

[0090] Example Ex16: An aerosol generating article according to any of the foregoing examples further includes a partition wall that defines at least a portion of both the main reservoir and at least a portion of the capillary buffer reservoir.

[0091] Example Ex17: An aerosol generating article according to any of the foregoing examples, wherein at least a portion of the main reservoir and at least a portion of the capillary buffer reservoir are integrally formed with each other.

[0092] Example Ex18: An aerosol generating article according to any of the preceding examples, wherein the liquid conduit is in direct fluid communication with the main reservoir.

[0093] Example Ex19: An aerosol generating article according to any of the foregoing examples further includes a bypass channel that provides direct fluid communication between the main reservoir and the fluid conduit to bypass the main reservoir.

[0094] Example Ex20: An aerosol-generating article according to any of the foregoing examples further includes three intersecting fluid channels, each of the three fluid channels being connected to one of the main reservoir, the capillary buffer reservoir, and the fluid conduit to provide nodal fluid communication between every two of the main reservoir, the capillary buffer reservoir, and the fluid conduit.

[0095] Example Ex21: An aerosol generating article according to any of the foregoing examples, wherein the liquid conduit passes through a wall defining at least a portion of the capillary buffer reservoir.

[0096] Example Ex22: An aerosol-generated article according to any of the preceding examples, wherein the article includes an evaporation zone.

[0097] Example Ex23: An aerosol-generating article according to Example Ex22, wherein the liquid conduit enters the evaporation zone or faces the evaporation zone.

[0098] Example Ex24: An aerosol generating article according to any of the foregoing examples, wherein the liquid conduit includes a wicking element, particularly including a filament bundle, preferably including an untwisted filament bundle, or a mesh.

[0099] Example Ex25: An aerosol generating article according to any of the foregoing examples, wherein the liquid conduit is inductively heated.

[0100] Example Ex26: An aerosol generating article according to any of the foregoing examples, wherein the liquid conduit includes a liquid delivery sensor assembly.

[0101] Example Ex27: An aerosol generating article according to any of the foregoing examples further includes an aerosol forming liquid contained in at least one of the main reservoir and the capillary buffer reservoir.

[0102] Example Ex28: An aerosol generation system includes an aerosol generation apparatus and an aerosol generation article according to any of the foregoing examples, used with said apparatus. Attached Figure Description

[0103] The example will now be described further with reference to the accompanying drawings, in which:

[0104] Figure 1A first embodiment of the aerosol-generated article according to the present invention is illustrated schematically;

[0105] Figure 2 It shows that AA passes through according to Figure 1 The cross-section of the aerosol-generated product;

[0106] Figure 3 It shows the path along line BB through according to Figure 1 The cross-section of the aerosol-generated product;

[0107] Figure 4 An exemplary embodiment of an aerosol generation system according to the present invention is illustrated schematically, the aerosol generation system comprising, according to Figure 1 Articles thereof and aerosol generating apparatus for use with the articles thereof;

[0108] Figure 5 It shows something similar to Figure 1 The article shown is an aerosol-generating article but does not have a partition wall;

[0109] Figure 6 The basis for the basic horizontal position is shown. Figure 1 Aerosol-generated products;

[0110] Figure 7 The inverted position is shown according to Figure 1 Aerosol-generated products;

[0111] Figure 8 A second embodiment of the aerosol-generated article according to the present invention is illustrated schematically;

[0112] Figure 9 A third embodiment of the aerosol-generated article according to the present invention is illustrated schematically;

[0113] Figure 10 The inverted position is shown according to Figure 9 Aerosol-generated products;

[0114] Figure 11 A fourth embodiment of the aerosol-generating article according to the present invention is schematically illustrated; and

[0115] Figure 12 It shows the CC line along the line according to Figure 11 The cross-section of the aerosol-generated product. Detailed Implementation

[0116] Figure 1 An aerosol-generating article 40 according to a first embodiment of the present invention is schematically shown. As will be discussed below regarding... Figure 4In further detail, the aerosol generating article 40 is configured for use with an induction-heated aerosol generating apparatus to evaporate the aerosol-forming liquid 50 provided by the aerosol generating article 40. Article 40 includes a generally cylindrical article housing made of a rigid, liquid-impermeable material such as PP (polypropylene). The article housing includes a cylindrical reservoir body 42, a bottom end cap 43 at one end of the reservoir body 42, and a top end cap 44 at the opposite end of the reservoir body 42. The article further includes a partition wall 41 that divides the internal space of the reservoir body 42 into a first compartment and a second compartment. The first and second compartments are arranged laterally adjacent to each other along the longitudinal axis of the reservoir body 42. The first compartment acts as a main reservoir 51 for storing the aerosol-forming liquid 50. In the second compartment, article 40 includes a generally disc-shaped sleeve 45 extending approximately half the length of the reservoir body 42. The sleeve 45 divides the internal space of the second compartment into two parts: an evaporation chamber 53 and a capillary buffer reservoir 52 for storing aerosol-forming liquid due to capillary action. This will be described in more detail below. The capillary buffer reservoir 52 is in fluid communication with the main reservoir 51 via a recess in the bottom end cap 43. The recess in the bottom end cap 43 is formed such that the main reservoir 51 has direct access to the capillary buffer reservoir 52, allowing the aerosol-forming liquid 50 to flow freely from the main reservoir 51 into the capillary buffer reservoir 52. To facilitate liquid flow around the free end of the partition wall 41 facing the bottom end cap 43, the free end of the partition wall 41 includes a rounded edge. In particular, the rounded edge facilitates air entry into the reservoir to flow around the end of the partition. In contrast, a sharp edge could become a bubble trap due to the pinning effect of the contact line.

[0117] Generally, the aerosol generating article 40 can be a single-use aerosol generating article or a multi-use aerosol generating article. In the latter case, the aerosol generating article 40 can be refillable. That is, the main reservoir 51 can be refilled with aerosol forming liquid 50 after it has been depleted.

[0118] Article 40 further includes a liquid conduit 70 in fluid communication with a capillary buffer reservoir 52 for conveying aerosol forming liquid 50 from the capillary buffer reservoir 52 to an evaporation chamber 53. Figure 2 and Figure 3 Further details of the liquid conduit 70 are shown, illustrating the flow along lines AA and BB respectively, according to... Figure 1The corresponding cross-section of the aerosol-forming article. In this embodiment, the liquid conduit 70 is implemented as an untwisted filament bundle comprising multiple filaments 71, 72 arranged parallel to each other. Due to the arrangement of the filaments 71, 72 in the filament bundle and due to the small diameter of the filaments 71, 72, the liquid conduit 70 includes narrow channels formed between the filaments 71, 72. These channels provide capillary action along the length of the liquid conduit 70, thereby allowing the aerosol-forming liquid 50 to be delivered from the capillary buffer reservoir 52 to the evaporation chamber 53.

[0119] In addition to its liquid transport properties, the liquid conduit 70 is also configured for inductive heating. For this purpose, the liquid conduit 70 includes at least a plurality of first filaments 71, which include a first sensor material optimized for heat generation. The liquid conduit 70 may also include a plurality of second filaments 72, which include a second sensor material used as a temperature marker, as further described above. Due to the sensitive properties of the filament material, the liquid conduit 70 is capable of being inductively heated in an alternating magnetic field, and thus evaporates the aerosol in thermal contact with the filaments 71, 72 to form a liquid. The liquid conduit 70 is therefore capable of performing two functions: transporting and heating the aerosol to form a liquid. For this reason, the liquid conduit can also be represented as a liquid transport sensor assembly.

[0120] like Figure 1 As can be seen, the liquid conduit 70 passes through the opening in the sleeve 45, such that the first portion of the liquid conduit 70 is arranged in the buffer reservoir 52, and the second portion is arranged in the evaporation chamber 53. The opening through the sleeve 45 serves not only as a feed passage for the liquid conduit but also as a means of bundling the filaments 71 and 72, that is, to hold the filaments 71 and 72 together. Furthermore, the opening is used to fix the position of the liquid conduit 70 relative to the product housing. Figure 2 and Figure 3 As can be further seen, the filament bundle of the liquid conduit 70 has a substantially circular cross-section that is particularly easy to manufacture.

[0121] Because the first portion of the liquid conduit 70 is arranged in the buffer reservoir 52 and is therefore immersed in the aerosol-forming liquid 50, it serves as an immersion section 75 for conveying the aerosol-forming liquid 50 from the buffer reservoir 52 to the second portion of the liquid conduit 70. In the evaporation chamber 53, the second portion serves at least partially as a heating section 76 for evaporating the aerosol-forming liquid 50 upon exposure to an alternating magnetic field, thereby inducing the heating wires 71, 72. This will be discussed below regarding... Figure 4 To describe in more detail.

[0122] like Figure 1As can be further seen, article 40 includes at least one air inlet 46 that enters evaporation chamber 53 through reservoir body 42, allowing air to enter evaporation chamber 53. Air inlet 46 may be configured to provide airflow at or around the heating section 76 of liquid conduit 70. Air inlet 46 may be an orifice through reservoir body 42. Similarly, air inlet 46 may be a nozzle configured to direct airflow to a specific target location in liquid conduit 70. Additionally, article 40 includes a conical mouthpiece 47 attached to a top end cap 44 and configured to be inserted into a user's mouth for inhalation. Mouthpiece 47 further includes a filter (not shown) and an air outlet 48. Mouthpiece 47 is in fluid communication with evaporation chamber 45 through outlet 49 in top end cap 44. Thus, when a user inhales at mouthpiece 47, air is drawn into evaporation chamber 53 through air inlet 46. Air then enters mouthpiece 47 through orifice 49 and further through filter 55 and air outlet 48 into the user's mouth. In the evaporation chamber 53, the aerosol formed by evaporation from the heating section 76 of the liquid conduit 70 is exposed to air passing through the article 40, thereby forming an aerosol that can then be drawn out through the mouthpiece 47.

[0123] Figure 4 An aerosol generation system 80 according to an exemplary embodiment of the present invention is schematically illustrated. System 80 includes, as shown below: Figure 1-3 The aerosol generating article 40 is shown, along with an electrically operated aerosol generating apparatus 60 capable of interacting with the article 40 to generate an aerosol. For this purpose, the aerosol generating apparatus 60 includes a receiving cavity 62 formed within an apparatus housing 61 at a proximal end of the apparatus 60. The receiving cavity 62 is configured to removably receive at least a portion of the aerosol generating article 40. Specifically, the aerosol generating apparatus is configured to inductively heat a heating section 76 of a liquid conduit 70 to evaporate an aerosol-forming liquid 50, which is conveyed from a capillary buffer reservoir 52 to the heating section 76 in an evaporation chamber 53 via an immersion section 75. For this purpose, the aerosol generating apparatus 60 includes an induction source comprising an induction coil 32. In this embodiment, the induction coil 32 is a single helical coil arranged and configured to generate a substantially uniform alternating magnetic field within the receiving cavity 62. Figure 4As can be seen, the induction coil 32 is arranged around the proximal portion of the receiving cavity 62 such that when the aerosol-forming article 40 is received in the receiving cavity 62, it only surrounds the heating section 76 of the liquid conduit 70. Therefore, in use of the device 60, the induction coil 32 generates an alternating magnetic field that penetrates only the heating section 76 of the liquid conduit 70 in the evaporation chamber 53 of the article 40. Conversely, due to localized heating, the immersion section 75 of the liquid conduit 70 is maintained at a temperature below the evaporation temperature. This prevents the aerosol-forming liquid 50 within the capillary buffer reservoir 52 and the main reservoir 51 from boiling. Therefore, in use, the liquid conduit 70 includes a temperature distribution with higher and lower temperature sections extending along its length. More specifically, the temperature distribution exhibits a temperature increase from a temperature below the evaporation temperature T_vap of the aerosol-forming liquid 50 in the immersion section 75 to a temperature above the corresponding evaporation temperature in the heating section 76.

[0124] The actual temperature distribution formed during the use of the sensor assembly 10 depends on the thermal conductivity and length of the liquid conduit 70. Therefore, in order to have a sufficient temperature gradient between the immersion section 75 and the heating section 76, the liquid conduit 70 requires a certain total length. In this embodiment, the total length of the liquid conduit 70 can be between 5 mm and 50 mm, particularly between 10 mm and 40 mm, preferably between 10 mm and 30 mm, and more preferably between 10 mm and 20 mm.

[0125] The liquid conduit 70 is eccentrically arranged about the geometric center axis of the aerosol-generating article 40. Thus, when the article 40 is received in the cavity 62 of the device 60, the liquid conduit 70 is eccentrically arranged about the axis of symmetry of the alternating magnetic field generated by the induction coil 32. Advantageously, due to the eccentric arrangement, the liquid conduit 70 is positioned in a region of the alternating magnetic field with a higher field density compared to a symmetrically arranged region. As a result, heating efficiency is improved.

[0126] The aerosol generating device 60 further includes a controller 64 for controlling the operation of the aerosol generating system 80, particularly for controlling heating operations. Furthermore, the aerosol generating device 60 includes a power source 63 that provides electricity for generating the alternating magnetic field. Preferably, the power source 63 is a battery, such as a lithium iron phosphate battery. The power source 63 may have a capacity that allows sufficient energy to be stored for one or more user experiences. Both the controller 64 and the power source 63 are arranged in the distal portion of the aerosol generating device 60.

[0127] Now about Figure 5-7 The function of capillary buffer reservoir 52 is described in more detail.

[0128] Figure 5 It shows that according to Figure 1However, this does not include aerosol-generating products 40 from capillary buffer reservoirs. Additionally, with Figure 1 compared to, Figure 5 Article 40 is shown in a basic horizontal orientation. Due to the different orientation, the aerosol-forming liquid 50 in article 40 is redistributed in a way that, depending on the fluid level, the liquid conduit 70 no longer contacts the aerosol-forming liquid 50. As a result, if the article is used in this orientation for a period of time, the delivery of the aerosol-forming liquid to the evaporation zone 53 is interrupted, which causes aerosol formation to rapidly decrease or even stop.

[0129] The purpose of the buffer reservoir 52 is to remedy this situation. Essentially, the buffer reservoir 52 provides a small-volume reservoir in fluid communication with the main reservoir 51 and the liquid conduit 70, and is configured to capture a certain amount of aerosol forming a liquid due to capillary action, independent of article orientation. For this purpose, at least one dimension of the capillary buffer reservoir 52 is chosen to be approximately the effective capillary length, which, for most liquids, is typically in the range of a few millimeters. In this embodiment, as... Figure 3 and Figure 6 As shown, the capillary effect of the buffer reservoir 52 is caused by the fact that the maximum distance D between the opposing portions of the partition wall 41 and the inner surface of the reservoir body 42 is only a few millimeters. For example, the maximum distance D can range between 1 millimeter and 5 millimeters. Thus, the capillary effect exceeds the force of gravity within the capillary buffer reservoir 52. Consequently, once the aerosol-forming liquid 50 has been filled into the buffer reservoir 52, when the orientation of the article changes, for example when the article 40 is removed from the container, the capillary effect is significantly reduced. Figure 1 The essentially upright position shown becomes as Figure 6 The position shown is basically horizontal, or even becomes like Figure 7 When the position shown is inverted, it prevents the aerosol-forming liquid from flowing back into the main reservoir 51. Therefore, similar to a pen's buffer reservoir, the buffer reservoir 40 reliably captures the aerosol-forming liquid independently of the article due to the capillary action of its small volume. However, the capillary action along the liquid conduit is still large enough to transport the captured liquid from the capillary buffer reservoir 52 to the evaporation zone.

[0130] The volume of the buffer reservoir is selected such that sufficient liquid is provided independently of the product direction for several pumping operations. Therefore, the total volume of the capillary buffer reservoir 52 can be at least 5 cubic millimeters, particularly at least 10 cubic millimeters, and preferably at least 15 cubic millimeters.

[0131] Figure 8 A second exemplary embodiment of the aerosol-generating article 140 according to the present invention is schematically illustrated. Generally, according to Figure 8 Aerosol-generating products 140 and Figure 1The aerosol-generating article 40 shown is very similar. Therefore, identical or similar features are indicated by the same reference numerals, only incremented by 100. Figure 1 Compared to the first embodiment shown, the main reservoir 151 does not directly connect to the capillary buffer reservoir 152. Instead, the main reservoir 151 and the capillary buffer reservoir 152 are in fluid communication with each other via a liquid channel 154. A first liquid channel is formed within the bottom end cap 143 and configured such that the fluid flow from the main reservoir 151 to the capillary buffer reservoir 152 is diverted by 180 degrees. This configuration delays accidental backflow of aerosol-forming liquid from the capillary buffer reservoir 152 into the main reservoir 154. In addition to the first liquid channel 154, the main reservoir 151 and the capillary buffer reservoir 152 are also in fluid communication with each other via a second liquid channel 155 through a partition wall 141. The second channel 155 facilitates, and particularly accelerates, the refilling of the capillary buffer reservoir 152 from the main reservoir 151, at the same time as or after the aerosol-forming liquid in the capillary buffer reservoir is depleted via the liquid conduit 170 during system use.

[0132] Figure 9 and Figure 10 A third exemplary embodiment of the aerosol-generating article 240 according to the present invention is schematically illustrated. Generally, according to Figure 9 and 10 Aerosol-generating products 240 and Figure 1 The aerosol-generating article 40 shown is similar. Therefore, identical or similar features are indicated by the same reference numerals, only incremented by 200. Figure 1 Compared to the product 40 shown, according to Figure 9 and 10 The article 240 includes a liquid conduit 270, a buffer reservoir 252, and an evaporation zone 253 arranged symmetrically about a geometric central axis of 240. The evaporation zone 253 is formed by a cylindrical partition wall 241, which is coaxially arranged within the cylindrical reservoir body 242. A substantially hollow cylindrical main reservoir 251 is formed between the cylindrical reservoir body 242 and the cylindrical partition wall 241. At the bottom portion, the evaporation zone 253 is closed by a disc-shaped sleeve 245. Similarly, the cylindrical reservoir body 242 is closed by a bottom end cap 243 including a recess, which is similar to... Figure 1The bottom end cap 43 of the article 40 shown is formed therein. A capillary buffer reservoir 252 is formed between the inner surface of the bottom end cap 243 on one side and the end face of the cylindrical partition wall 241 and the disc-shaped sleeve 245 on the other side. The distance D between the inner surface of the bottom end cap 243 and the end face of the cylindrical partition wall 241 and the disc-shaped sleeve 245 is chosen to be approximately the effective capillary length, for example, in the range of 1 mm to 5 mm. Thus, once filled with an aerosol-forming liquid, even when the orientation of the article 240 changes, for example when the article 40 is removed from a container... Figure 9 The essentially upright position shown becomes as Figure 10 In the inverted position shown, the capillary buffer reservoir 252 also captures a certain amount of aerosol-forming liquid due to capillary action. Therefore, the immersion section 275 of the liquid conduit 270 is always in contact with the aerosol-forming liquid independently of the article position. The volume of the capillary buffer reservoir 252 is selected such that the amount of aerosol-forming liquid that can be captured is sufficient for at least several aspirations.

[0133] Figure 11 and Figure 12 A fourth exemplary embodiment of the aerosol-generating article 240 according to the present invention is schematically illustrated. Generally, according to Figure 11 and 12 Aerosol-generating products 340 and Figure 1 The aerosol-generating article 40 shown is similar. Therefore, identical or similar features are indicated by the same reference numerals, only incremented by 300. Figure 1 Compared to the product 40 shown, according to Figure 11 and 12 The article 340 also includes a plurality of sheets 358 at the partition wall 341. The plurality of sheets 358 advantageously increase the inner surface of the buffer reservoir 352 and thus increase its capillary action. Basically, the sheet structure functions similarly to the sheet structure in a pen. In this embodiment, the distance between adjacent sheets can range from 1 mm to 2 mm.

[0134] For the purposes of this specification and the appended claims, unless otherwise indicated, all figures representing quantities, quantities, percentages, etc., shall be understood to be modified by the term "about" in all cases. Furthermore, all ranges include the disclosed maximum and minimum points, and include any intermediate ranges that may or may not be specifically listed herein. Thus, in this context, the numeral A shall be understood as A ± 5%. Within this context, the numeral A may be considered as a value included within the general standard error of the measurement of the characteristic modified by the numeral A. In some instances as used in the appended claims, the numeral A may deviate from the percentages listed above, provided that the amount of deviation from A does not materially affect the fundamental and novel features of the claimed invention. Furthermore, all ranges include the disclosed maximum and minimum points, and include any intermediate ranges that may or may not be specifically listed herein.

Claims

1. An aerosol generating article for use with an aerosol generating apparatus, the aerosol generating article comprising: A main reservoir for storing aerosol-forming liquids; A capillary buffer reservoir in fluid communication with the main reservoir, the capillary buffer reservoir being used to store aerosol-forming liquids due to capillary action; as well as A liquid conduit in fluid communication with at least the capillary buffer reservoir, the liquid conduit being used to provide aerosol-forming liquid to the outside of the capillary buffer reservoir and the main reservoir at an interface, wherein the liquid conduit comprises a bundle of filaments, and wherein the bundle of filaments comprises a plurality of first filaments, the plurality of first filaments comprising or being made of a first sensor material; The capillary buffer reservoir contains no capillary material or liquid holding material.

2. The aerosol-generating article of claim 1, wherein the maximum dimension between two opposing walls of at least a portion of the capillary buffer reservoir is between 0.2 mm and 5 mm.

3. The aerosol generating article according to claim 1, wherein the total volume of the capillary buffer reservoir is at most 60 cubic millimeters.

4. The aerosol generating article according to claim 1, wherein the capillary buffer reservoir comprises a sheet structure.

5. The aerosol generating article according to claim 1, wherein the main reservoir is directly connected to the capillary buffer reservoir, or wherein the main reservoir and the capillary buffer reservoir are in fluid communication with each other via at least a first liquid channel.

6. The aerosol generating article of claim 5, wherein the first liquid channel is configured to redirect the liquid flow through the aerosol generating article by at least 90 degrees.

7. The aerosol generating article of claim 6, wherein the first liquid channel is configured to redirect the liquid flow through the aerosol generating article by 180 degrees.

8. The aerosol-generating article according to claim 1, wherein, with respect to the liquid flow through the aerosol-generating article, the capillary buffer reservoir is downstream of the main reservoir, and the liquid conduit is downstream of the capillary buffer reservoir.

9. The aerosol generating article according to claim 1, wherein, with respect to the liquid flow through the aerosol generating article, at least a portion of the liquid conduit is arranged at or within a downstream portion of the capillary buffer reservoir.

10. The aerosol generating article of claim 1, wherein the capillary buffer reservoir is arranged adjacent to the main reservoir.

11. The aerosol generating article of claim 1, further comprising a partition wall that defines at least a portion of both the main reservoir and at least a portion of the capillary buffer reservoir.

12. The aerosol generating article according to claim 1, wherein at least a portion of the main reservoir and at least a portion of the capillary buffer reservoir are integrally formed with each other.

13. The aerosol generating article according to any one of claims 1-12, wherein the aerosol generating article includes an evaporation zone, wherein the liquid conduit enters the evaporation zone or faces the evaporation zone.

14. The aerosol generating article according to claim 13, wherein the main reservoir, the capillary buffer reservoir, and the evaporation zone are sequentially fluidly connected.

15. An aerosol generation system comprising an aerosol generation apparatus and an aerosol generation article according to any one of claims 1-14, used in conjunction with said aerosol generation apparatus.

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