Cartridge for use in an aerosol-generating system

Abstract

A cartridge (200) for use in an aerosol-generating system (100) is provided. The cartridge (200) comprises a reservoir (303) for liquid aerosol-forming substrate, a heating element (304) for heating liquid aerosol-forming substrate from the reservoir (303) and a wall (307). A first space adjacent to the heating element (304) and between the wall (307) and the heating element (304) forms a thermal zone (306). A second space adjacent to the heating element (304) forms a feed zone (308). The reservoir (303) is in fluid communication with the feed zone (308) and the thermal zone (306). An aerosol-generating system is also provided.

Description

Technical Field

[0001] This disclosure relates to a cylinder for use in an aerosol generation system. This disclosure also relates to an aerosol generation system including said cylinder. Background Technology

[0002] In many known aerosol generation systems, a liquid aerosol-forming matrix is ​​heated and evaporated to form vapor. The vapor is then cooled and condensed to form an aerosol. In some aerosol generation systems, such as electrically heated smoking systems, this aerosol is then inhaled by the user.

[0003] Typically, a liquid aerosol forming matrix comprises several compounds that evaporate when heated. These compounds can have different boiling points. For example, a liquid aerosol forming matrix may include nicotine (which has a boiling point of about 247 degrees Celsius at atmospheric pressure) and glycerol (which has a boiling point of about 290 degrees Celsius at atmospheric pressure).

[0004] When a liquid aerosol forming matrix comprising compounds with different boiling points is heated, the compounds with lower boiling points can evaporate before the compounds with higher boiling points. Alternatively or additionally, the compounds with lower boiling points can evaporate at a higher rate than the compounds with higher boiling points.

[0005] This may be undesirable because the interactions and combinations between different compounds can be limited. For example, a liquid aerosol forming matrix may include nicotine compounds and organic acid compounds with different boiling points. Both of these compounds can evaporate. Nicotine in the liquid aerosol forming matrix can form free nicotine base upon evaporation. However, it may be desirable to generate aerosols containing nicotine salts rather than free nicotine bases. To form such nicotine salts, free nicotine bases can be protonated by the evaporating organic acid. However, this protonation may be limited if the organic acid evaporates only after the nicotine has evaporated, or if it evaporates more slowly than required to protonate a suitable proportion of free nicotine bases.

[0006] Furthermore, the faster evaporation of some compounds in the aerosol-forming matrix compared to others may undesirably cause changes in the properties of the generated aerosol over time, for example, during the operation of a suction aerosol generation system. This may be because, near the start of suction, when the heating element is activated and the temperature rises, the liquid aerosol-forming matrix near the heating element can reach a first temperature at which first compounds with lower boiling points evaporate, but second compounds with higher boiling points do not. Then, in the later stages of suction, the liquid aerosol-forming matrix near the heating element can reach a second temperature at which second compounds with higher boiling points evaporate. However, by this time, many of the first compounds in the liquid aerosol-forming matrix near the heating element may have already evaporated. Therefore, near the start of suction, the generated aerosol may include a larger proportion of the first compounds, and in the later stages of suction, the generated aerosol may include a larger proportion of the second compounds.

[0007] Alternatively or additionally, the properties of the generated aerosol can change during several aspirations. This can occur if the compounds in the liquid aerosol forming matrix do not evaporate at an appropriate rate. For example, the liquid aerosol forming matrix may comprise X% by mass of a first compound and Y% by mass of a second compound. If the liquid aerosol forming matrix does not evaporate to produce vapor comprising a first compound to second compound in a mass ratio of X:Y, the composition of the liquid aerosol forming matrix may change during vapor production. This, in turn, may lead to changes in the properties of the aerosol generated from the liquid aerosol forming matrix. Summary of the Invention

[0008] The purpose of this invention is to control the evaporation of various compounds that form a liquid aerosol matrix, wherein these compounds have different boiling points.

[0009] According to one aspect of this disclosure, a cylinder for an aerosol generation system is provided. The cylinder may include a reservoir for a liquid aerosol forming matrix. The cylinder may include a heating element for heating the liquid aerosol forming matrix from the reservoir. The cylinder may include a wall. A first space may be adjacent to the heating element and between the wall and the heating element. The first space may form a hot region. A second space may be adjacent to the heating element. The second space may form a supply region. The reservoir may be in fluid communication with the supply region and the hot region.

[0010] In use, the hot zone can be heated to a higher temperature than the supply zone. Alternatively or additionally, in use, the hot zone can increase in temperature at a greater rate than the supply zone. Both the hot zone and the supply zone can be heated to a temperature sufficient to evaporate at least one compound in the liquid aerosol forming matrix. Thus, in use, the cylinder can provide a higher temperature zone and a lower temperature zone in which the liquid aerosol forming matrix evaporates.

[0011] Advantageously, the cylinder can improve the control of evaporation of different compounds forming a liquid aerosol matrix. The cylinder allows liquid aerosol matrix compounds with higher and lower boiling points to evaporate simultaneously at desired rates. The cylinder allows liquid aerosol matrix compounds with higher and lower boiling points to evaporate in a more preferred ratio. The cylinder can provide the generation of aerosols with more desired compositions. The cylinder can provide more consistent generation of aerosols with desired properties.

[0012] During use, the hot zone can be heated to a first temperature. During use, the supply area can be heated to a second temperature. The first temperature can be higher than the second temperature. The first temperature can be at least 5, 10, 20, or 30 degrees Celsius higher than the second temperature.

[0013] Advantageously, the larger temperature difference between the hot zone and the supply zone allows the liquid aerosols with higher and lower boiling points to form matrix compounds to evaporate at a more preferred rate or at a more preferred proportion or at a more preferred rate and a more preferred proportion.

[0014] The reservoir may be configured to store or be able to store at least 0.2, 0.5, or 1 ml of liquid aerosol forming matrix. The reservoir may also be configured to store or be able to store less than 2, 1.8, or 1.5 ml of liquid aerosol forming matrix.

[0015] The wall may be located within the reservoir. The wall may form the boundary of the reservoir. The wall may contact the reservoir. The wall may contact the supply area. The wall may contact the hot area. At least a portion of the wall may be located between the supply area and the reservoir. At least a portion of the wall may be located between the hot area and the reservoir. In use, the liquid aerosol forming matrix may be located on two opposite sides of the wall. In use, the liquid aerosol forming matrix may contact two opposite sides of the wall.

[0016] The supply area may be adjacent to an opening in the wall. The supply area may be adjacent to the edge of the wall. The wall may be parallel to the heating element. The wall may have substantially the same shape as the heating element.

[0017] The wall can thermally insulate the heating element or at least a portion of the heating element from the reservoir. The wall can thermally insulate the hot zone from the reservoir. The wall can thermally insulate the supply area from the reservoir. The wall, or the material forming the wall, may have a thermal conductivity at least 10, 20, 30, 40, 50, 60, or 70% lower than that of the liquid aerosol forming matrix. Therefore, the arrangement of the wall at least partially causes the generation of a hot zone and a relatively cool supply area.

[0018] Advantageously, this can improve the energy efficiency of the cylinder because less heat can be dissipated into the reservoir from the heating element, or from the hot zone, or from the supply zone.

[0019] The hot zone can be more thermally insulated than the supply zone. Therefore, if the supply zone and the hot zone are raised to the same temperature and then cooled, the initial cooling rate of the supply zone can be greater than that of the hot zone.

[0020] Advantageously, this can help increase or maintain the temperature difference between the supply area and the hot area during use.

[0021] The portion of the wall that contacts the supply area can be thinner than the portion of the wall that contacts the heat area. The degree to which the wall thermally isolates the supply area from the reservoir can be less than the degree to which the wall thermally isolates the heat area from the reservoir.

[0022] Advantageously, this can help increase or maintain the temperature difference between the supply area and the hot area during use.

[0023] In use, the liquid aerosol forming matrix can be transported from the reservoir to the supply area. In use, the liquid aerosol forming matrix can be transported from the reservoir toward the heating element via the supply area. In use, the liquid aerosol forming matrix can be transported from the supply area to the heated area. In use, the liquid aerosol forming matrix can be transported from the reservoir to the heated area via the supply area.

[0024] In use, the liquid aerosol forming matrix can be transported from the reservoir to the hot zone only via the supply area. That is, the cylinder can be configured such that the liquid aerosol forming matrix in the reservoir must be transported through the supply area to reach the hot zone.

[0025] Advantageously, conveying the liquid aerosol forming matrix to the hot zone via the supply area implies that the liquid aerosol forming matrix arriving at the hot zone has already been heated to a certain degree. This is because the supply area can be adjacent to the heating element. In this sense, the liquid aerosol forming matrix arriving at the hot zone can be preheated.

[0026] The cylinder may include channels, such as constriction channels. These channels connect the reservoir to the supply area. In use, the liquid aerosol forming matrix can be conveyed from the reservoir to the supply area via the channels. In use, the liquid aerosol forming matrix can be conveyed from the reservoir through the channels and then through the supply area to a heated area.

[0027] In use, the liquid aerosol forming matrix can be conveyed from the reservoir through a channel and then through a supply area to the hot area. That is, the cylinder can be configured such that the liquid aerosol forming matrix in the reservoir must be conveyed through the channel and then through the supply area to reach the hot area. The wall can form the boundary of the channel.

[0028] Advantageously, channels or constricted channels can reduce heat dissipation from the heating element or hot zone or supply zone to the reservoir.

[0029] The cylinder may include an air inlet. The cylinder may include an air outlet. The airflow path may be defined between the air inlet and the air outlet. Air drawn from the air inlet to the air outlet may flow over, pass over, pass through, or pass through the heating element.

[0030] Advantageously, this increases the temperature of the airflow during use. Some users may prefer this, as it more accurately simulates the experience of smoking a regular cigarette or cigar.

[0031] The heating element may at least partially define or surround the airflow path. For example, the heating element may define at least 180, 225, 270, or 315 degrees of the airflow path. For example, the cross-section of the heating element may form seven sides of a regular octagon. Air can flow through an air inlet, then through the center of the octagon, and then through an air outlet. As another example, the heating element may be prismatic, having a base forming a circle at 300 degrees and a length extending vertically from the base. Air can flow through an air inlet, then through the center of the base, then along the length of the heating element, and then through an air outlet.

[0032] The heating element may define or surround the airflow path. For example, the cross-section of the heating element may form a closed two-dimensional shape, such as a circle or a polygon. Air can flow through an air inlet, then through this closed two-dimensional shape formed by the cross-section of the heating element, and then through an air outlet. As another example, the heating element may be in the shape of a hollow cylinder, and air can flow through an air inlet, then through the hollow cylinder, and then through an air outlet.

[0033] Advantageously, a heating element that at least partially defines or surrounds the airflow path can increase the amount of airflow in contact with the heating element. This can increase the average temperature of the airflow. It can also increase the entrainment of vapor formed by the heating element in the airflow.

[0034] More than one airflow path can be defined within the cylinder. For example, the cylinder may include multiple air inlets or multiple air outlets, or both. Alternatively or additionally, the airflow path from the air inlets may be divided into two or more airflow paths. Alternatively or additionally, two or more airflow paths within the cylinder may be merged and exit through a single air outlet.

[0035] Advantageously, this allows for adjustment of the average temperature of the aerosol delivered to the user. This is because one or more airflow paths can be heated, while one or more other airflow paths may not need to be heated. Additionally, this allows for adjustment of the suction resistance of the cartridge. For example, for a given suction intensity at the air outlet, adding an additional air inlet can allow the user to draw a larger airflow through the cartridge.

[0036] The heating element or its components may include a resistive material. The cylinder may be configured such that current flows through the heating element or its components during use. This allows for resistive heating of the heating element or its components. Thus, the heating element or its components can be configured for resistive heating.

[0037] The heating element or portions thereof may comprise or be formed of any material having suitable electrical and mechanical properties (e.g., a suitable resistive material). Suitable materials include, but are not limited to: semiconductors (such as doped ceramics), “conductive” ceramics (such as molybdenum disilicide), carbon, graphite, metals, metal alloys, and composite materials made of ceramic and metallic materials. Such composite materials may comprise doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum, and platinum group metals. Examples of suitable metal alloys include stainless steel; constantan; nickel-containing alloys, cobalt-containing alloys, chromium-containing alloys, aluminum-containing alloys, titanium-containing alloys, zirconium-containing alloys, hafnium-containing alloys, niobium-containing alloys, molybdenum-containing alloys, tantalum-containing alloys, tungsten-containing alloys, tin-containing alloys, gallium-containing alloys, manganese-containing alloys, and iron-containing alloys; and nickel-, iron-, and cobalt-based superalloys, stainless steel, Iron-aluminum based alloys and iron-manganese-aluminum based alloys. "Is a registered trademark of Titanium Metals Corporation, 1999 Broadway Suite 4300, Denver, Colorado." In composite materials, the resistive material may optionally be embedded in, encapsulated by, or coated with an insulating material, or vice versa, depending on the energy transfer kinetics and desired external physicochemical properties. The heating element or portions thereof may include a metal-etched foil insulated between two layers of inert material. In this case, the inert material may include... Polyimide or mica foil. It is a registered trademark of EIdu Pont de Nemours and Company, 1007 Market Street, Wilmington, Delaware 19898, United States of America.

[0038] The heating element may include a first part and a second part. The first part may be configured to be heated to a higher temperature than the second part.

[0039] Advantageously, this allows for the creation of more regions with higher temperatures and more regions with lower temperatures. This allows for a more favorable evaporation rate for compounds forming a matrix of liquid aerosols with higher and lower boiling points. Alternatively or additionally, this allows for a larger temperature difference between the hot region and the supply region. This can be achieved by positioning a first portion closer to the hot region than the supply region, or by positioning a second portion closer to the supply region than the hot region, or by positioning both portions closer to the hot region and the first portion closer to the supply region than the hot region.

[0040] The heating element, or a first or second portion of the heating element, or both the first and second portions, may be configured to heat to at least 50, 100, 150, 200, 250, 300, 350, or 400 degrees Celsius. In use, the heating element, or a first or second portion of the heating element, or both the first and second portions, may be heated to at least 50, 100, 150, 200, 250, 300, 350, or 400 degrees Celsius.

[0041] The first part may have one or more of a first resistance, a first resistivity, and a first average cross-sectional area. The second part may have one or more of a second resistance, a second resistivity, and a second average cross-sectional area. The first resistance may be greater than the second resistance. The first resistivity may be greater than the second resistivity. The first average cross-sectional area may be smaller than the second average cross-sectional area.

[0042] Advantageously, this allows the first part to be heated to a higher temperature than the second part.

[0043] The second part may include a section arranged to contact itself. For example, the section may be folded or bent so that the section contacts itself.

[0044] Advantageously, when the second part is heated by resistance, this reduces the resistance of the second part. This can lower the temperature to which the second part is heated.

[0045] The heating element or portions thereof may include sensor material. The cylinder may be configured for use in an aerosol generation system including a sensor (e.g., an induction coil). The sensor may be located within an aerosol generation device with a power source. The device may be configured to engage with the cylinder. Alternatively, the sensor may be located within the cylinder. The cylinder may be configured to engage with an aerosol generation device with a power source.

[0046] The power supply can be configured to pass alternating current through an inductor in the cylinder or an inductor in the device, causing the inductor to generate a fluctuating or oscillating electromagnetic field.

[0047] Alternating current can have any suitable frequency. Alternating current can be high-frequency. Alternating current can have frequencies between 100 kHz and 30 MHz. When the inductor is a tubular inductor coil, the alternating current can have frequencies between 500 kHz and 30 MHz. When the inductor is a flat inductor coil, the alternating current can have frequencies between 100 kHz and 1 MHz.

[0048] The heating element can be located within or otherwise subjected to the electromagnetic field generated by the inductor. This can induce eddy currents and hysteresis losses in the inductor material. This can cause the inductor material to heat up. Therefore, the power supply and the inductor can be configured to inductively heat the heating element or parts thereof.

[0049] The sensor material can be, or can include, any material capable of being inductively heated to a temperature sufficient to generate aerosols from the aerosol-forming matrix. Preferred sensor materials can be heated to temperatures exceeding 50, 100, 150, 200, 250, 300, 350, or 400 degrees Celsius. Preferred sensor materials can include metals or carbon, or both metals and carbon. Preferred sensor materials can include ferromagnetic materials, such as ferritic iron, or ferromagnetic steel or stainless steel. Suitable sensor elements can be, or include, one or more of graphite, molybdenum, silicon carbide, stainless steel, niobium, and aluminum. Preferred sensor materials can include or be formed from 400 series stainless steel, such as grade 410, 420, or 430 stainless steel. Different materials will dissipate different amounts of energy when positioned within electromagnetic fields with similar frequency values ​​and field strengths. Therefore, parameters of the sensor material, such as material type and size, can be varied to provide the desired power dissipation within a known electromagnetic field.

[0050] Advantageously, in induction heating aerosol generation systems, no electrical contacts need to be formed between the heating element and the aerosol generation device. Additionally, the heating element may not need to be electrically connected to other components. This eliminates the need for solder or other bonding elements. The inclusion of a heating element configured for induction heating in the cylinder allows for the production of simple, inexpensive, and robust cylinders. Cylinders are typically produced in quantities far exceeding those of the aerosol generation device operating with them—a number of disposable items. Therefore, reducing the cost of the cylinders can result in significant cost savings for manufacturers. Furthermore, induction heating offers improved energy conversion compared to resistance heating. This is because induction heating may not have the power losses associated with the resistance in the connection between the heating element and the power source.

[0051] The first part may include one or more of the following: curved sections, folded sections, corrugated sections, and undulating sections. This can increase the volume or surface area of ​​the first part present in a given volume. Advantageously, this can allow the first part to transfer more heat to the given volume.

[0052] A bend can refer to a gradual change in direction. Therefore, a bend can form an arc or a "C" shape.

[0053] A fold can refer to a step change in direction. Therefore, a fold can form two sides of a polygon or a "V" shape.

[0054] The undulation may include multiple bends. For example, the undulation may refer to a gradual change in direction in a first direction, followed by a gradual change in direction in another direction (e.g., the opposite direction). Thus, the undulation may form a sine wave or an "S" shape.

[0055] The corrugated section may include multiple folds. For example, the corrugated section may indicate a step change in direction, followed by another step change in direction. Therefore, the corrugated section may form a rectangle, an "M" shape, or an "N" shape with three sides.

[0056] Advantageously, one or more of the bends, undulations, folds, and corrugations can allow the first part to heat a given volume to a higher temperature. For example, the first part may include a tightly bent "S" shape. The area around this tightly bent "S" shape of the first part can be heated to a higher temperature than if the tightly bent "S" shape were not present.

[0057] The cross-section or cross-sectional area of ​​the heating element can vary. For example, the average cross-sectional area of ​​the first part can be at least 5, 10, 20, 30, or 50% smaller than the average cross-sectional area of ​​the second part.

[0058] Advantageously, if the heating element is configured for resistance heating, this may result in the first part having a higher resistance and being heated to a higher temperature compared to the second part.

[0059] The first part can be located closer to the hot zone than the second part. The second part can be located closer to the supply area than the first part. The first part can be adjacent to or in contact with the hot zone, or adjacent to and in contact with the hot zone. The first part may not be in contact with the supply area. The second part can be adjacent to or in contact with the supply area, or adjacent to and in contact with the supply area. The first part may not be in contact with the hot zone.

[0060] Advantageously, this allows the first part to heat the hot area more than the second part. Alternatively or additionally, this can mean that more heat is transferred from the first part to the hot area than to the supply area. This can help increase or maintain the temperature difference between the hot area and the supply area during use.

[0061] The cylinder may include a support for a heating element. The heating element may contact the support. A second portion of the heating element may contact the support. A first portion of the heating element may not contact the support. The heating element may be fixed to, or at least partially fixed in place, by the support.

[0062] Advantageously, the support can fix the heating element in place.

[0063] The wall can form a support.

[0064] Advantageously, the wall forming the support eliminates the need for a separate structure to form the support. This allows for the manufacture of cheaper cylinders.

[0065] During use, the liquid aerosol forming matrix in the supply zone can evaporate. During use, the liquid aerosol forming matrix in the hot zone can evaporate. During use, the liquid aerosol forming matrix in both the supply zone and the hot zone can evaporate simultaneously.

[0066] Advantageously, this can increase the evaporation rate of the liquid aerosol forming matrix during the use of the cylinder. Furthermore, the average composition of the liquid aerosol forming matrix evaporating from the supply region can differ from the average composition of the liquid aerosol forming matrix evaporating from the hot region. Compared to the liquid aerosol forming matrix evaporating from the hot region, the liquid aerosol forming matrix evaporating from the supply region can include a larger proportion of compounds with relatively low boiling points. Compared to the liquid aerosol forming matrix evaporating from the supply region, the liquid aerosol forming matrix evaporating from the hot region can include a larger proportion of compounds with relatively high boiling points. Therefore, liquid aerosol forming matrix compounds with higher and lower boiling points can evaporate simultaneously at a desired rate and in a more preferred proportion. Aerosols with a more desired composition can be generated. Aerosols with desired properties can be generated more consistently.

[0067] The supply area can be located between the wall and the heating element.

[0068] The minimum distance between the wall passing through the hot zone and the heating element can be less than the minimum distance between the wall passing through the supply zone and the heating element. Alternatively or additionally, the maximum distance between the wall passing through the hot zone and the heating element can be less than the maximum distance between the wall passing through the supply zone and the heating element. Alternatively or additionally, the average distance between the wall passing through the hot zone and the heating element can be less than the average distance between the wall passing through the supply zone and the heating element.

[0069] Advantageously, this can increase the temperature difference between the heated area and the supplied area during use. Specifically, this allows for greater heating of the heated area.

[0070] The heated zone can be smaller than the supply zone. During the use of the cylinder, the heated zone may include a smaller volume of liquid aerosol forming matrix compared to the supply zone.

[0071] Advantageously, this can increase the temperature difference between the heated area and the supplied area during use. Specifically, this allows for greater heating of the heated area.

[0072] The heating element may be perforated. The heating element may be a mesh heating element. The heating element may include a mesh. The first part or the second part, or both the first part and the second part, may include perforations or a mesh.

[0073] Advantageously, a grid heating element or a heating element including a grid can provide a large surface area in contact with the liquid aerosol forming matrix. This large surface area can provide efficient evaporation of the liquid aerosol forming matrix.

[0074] The wall may be configured to retain a liquid aerosol forming matrix. The wall may include a liquid aerosol forming matrix, or may be a material impregnated with a liquid aerosol forming matrix, or a material configured to be impregnated with a liquid aerosol forming matrix. The wall may have a fibrous or sponge structure. The wall may include a porous material. The wall may include a capillary material. The wall may include a capillary bundle. For example, the wall may include one or more of fibers, threads, and fine-pore tubes.

[0075] The wall may comprise a sponge-like or foam-like material. The structure of the wall may form multiple small holes or tubes, through which liquid can be transported via capillary action.

[0076] The wall may comprise any suitable material or combination of materials. Suitable materials include, but are not limited to: sponge or foam materials; ceramic or graphite-based materials in fibrous or sintered powder form; foamed metal or plastic materials; fibrous materials, such as cellulose acetate, polyester or bonded polyolefins, polyethylene, polyester or polypropylene fibers, nylon fibers, or ceramics, manufactured from spun or extruded fibers. The wall may comprise ceramic materials. The wall may have any suitable capillary action and porosity for use with different liquid aerosol forming matrices with different physical properties.

[0077] Advantageously, these materials allow liquid aerosols to form a matrix that passes through the wall. This prevents the various areas of the heating element, or the hot or supply areas, from drying out.

[0078] In use, the liquid aerosol forming matrix can pass through the wall. In use, the liquid aerosol forming matrix can be transferred from the reservoir through the wall toward the heating element. In use, the liquid aerosol forming matrix can be transferred from the reservoir through the wall toward the hot zone, or transferred into the hot zone. In use, the liquid aerosol forming matrix can be transferred from the reservoir through the wall toward the supply area, or transferred into the supply area.

[0079] Advantageously, the ability of the liquid aerosol forming matrix to pass through the wall prevents the hot zone, supply zone, or portion of the heating element from drying out during the evaporation of the liquid aerosol forming matrix. This allows for more uniform evaporation of the liquid aerosol forming matrix.

[0080] The wall can be in fluid communication with the reservoir.

[0081] Advantageously, the fluid communication between the wall and the reservoir allows the liquid aerosol forming matrix removed from the wall to be rapidly and automatically replenished by the liquid aerosol forming matrix from the reservoir.

[0082] The thermal conductivity of the wall can be less than that of the matrix formed by the liquid aerosol.

[0083] Advantageously, this allows the wall to effectively thermally isolate the heating element or supply area or hot area from the reservoir.

[0084] The wall may not be porous. The liquid aerosol forming matrix may not be able to pass through the wall. The wall may comprise or be formed of a polymeric material. Advantageously, a non-porous material can prevent the liquid aerosol forming matrix from passing through the wall. Depending on the arrangement of the wall, this may mean that the liquid aerosol forming matrix must pass through the supply area to reach the hot area. Therefore, the liquid aerosol forming matrix reaching the hot area can be preheated.

[0085] The shortest distance between the hot zone and the heating element can be equal to the shortest distance between the supply zone and the heating element. The hot zone can be in contact with the heating element. The supply zone can be in contact with the heating element.

[0086] The cylinder may include a second heated region. This second heated region may be formed by a third space adjacent to the heating element. The third space may be between the wall and the heating element. The second heated region may be in contact with the heating element. The second heated region may be in contact with the wall.

[0087] The characteristics described above for the first space or thermal region can be applied to the third space or the second thermal region, respectively.

[0088] In use, the liquid aerosol forming matrix can be conveyed from the supply area to the second hot area. Therefore, the liquid aerosol forming matrix can be conveyed from the supply area to the hot area and the second hot area. In use, the liquid aerosol forming matrix can be conveyed from the reservoir to the second hot area via the supply area. In use, the liquid aerosol forming matrix can be conveyed from the reservoir to the second hot area only via the supply area. That is, the cylinder can be configured such that the liquid aerosol forming matrix in the reservoir must be conveyed through the supply area to reach the second hot area.

[0089] Advantageously, conveying the liquid aerosol forming matrix to the second heated zone via the supply area means that the liquid aerosol forming matrix arriving at the second heated zone has already been heated. This is because the supply area can be adjacent to the heating element. In this sense, the liquid aerosol forming matrix arriving at the second heated zone can be preheated.

[0090] The cylinder may include a second supply region. The second supply region may be formed by a fourth space adjacent to the heating element.

[0091] The features described above regarding the second space or supply area can be applied to the fourth space or the second supply area, respectively.

[0092] Advantageously, in use, the second heating zone and the second supply zone can increase the number of zones with higher and lower temperatures. This allows the liquid aerosols with higher and lower boiling points to form matrix compounds to evaporate simultaneously at a desired rate. This allows the liquid aerosols with higher and lower boiling points to evaporate in a more preferred ratio. This can provide the generation of aerosols with a more desired composition. This can provide the more consistent generation of aerosols with desired properties.

[0093] In use, the liquid aerosol forming matrix can be conveyed from the second supply area to the second hot area. In use, the liquid aerosol forming matrix can be conveyed from the reservoir to the second hot area via the second supply area. In use, the liquid aerosol forming matrix can be conveyed from the reservoir to the second hot area only via the second supply area. That is, the cylinder can be configured such that the liquid aerosol forming matrix in the reservoir must be conveyed through the second supply area to reach the second hot area.

[0094] Advantageously, conveying the liquid aerosol forming matrix to the second hot zone via the second supply region means that the liquid aerosol forming matrix arriving at the second hot zone has already been heated. This is because the second supply region can be adjacent to the heating element. In this sense, the liquid aerosol forming matrix arriving at the second hot zone can be preheated.

[0095] The reservoir can be in fluid communication with the second supply area and the second hot area.

[0096] The channel connects the reservoir to a second supply area. In use, the liquid aerosol forming matrix can be transported from the reservoir to the supply area via the channel. In use, the liquid aerosol forming matrix can be transported from the reservoir to the second hot zone via the channel and then via the supply area.

[0097] The cylinder may include a second channel, such as a second constriction channel. The second channel connects the reservoir to a second supply region. In use, the liquid aerosol forming matrix can be conveyed from the reservoir to the supply region via the second channel. In use, the liquid aerosol forming matrix can be conveyed from the reservoir to a second heated region via the second channel and then via the supply region. The wall or second wall may form the boundary of the second channel.

[0098] Advantageously, the second channel or second constriction channel can reduce the heat dissipated from the heating element or the second hot zone or the second supply zone into the reservoir.

[0099] The cylinder may include a first electrical contact and a second electrical contact electrically connected to the heating element. The electrical contacts may include one or more of the following: tin, silver, gold, copper, aluminum, steel (e.g., stainless steel), phosphor bronze, tin alloyed with antimony, tin alloyed with zirconium, tin alloyed with bismuth, or tin alloyed with other components that improve resistance to organic acids.

[0100] The electrical contacts can be configured to form an electrical connection with the corresponding electrical contacts on the aerosol generating device when the cylinder is engaged with the aerosol generating device.

[0101] According to a second aspect of this disclosure, an aerosol generation system is provided. The system may include a cylinder. The cylinder may be the cylinder according to this disclosure. The system may include an aerosol generation device. The aerosol generation device may include a power source.

[0102] The cylinder can be configured to engage with and disengage from the aerosol generating device. The power source can be configured to supply power to the heating element. The power source can also be configured to supply power to the heating element only when the cylinder is engaged with the aerosol generating device.

[0103] The aerosol generating apparatus may include a controller. The controller may be configured to control the power supply from a power source. Therefore, the controller can control the heating of the heating element.

[0104] The power supply can be configured to supply power to the heating element for resistance heating. The power supply can also be configured to supply power to the heating element for induction heating.

[0105] The aerosol generating device can be configured to engage with and disengage from a cylinder via a snap-fit ​​connection, corresponding thread, or any other suitable means. The aerosol generating device can be configured as at least a portion of the receiving cylinder. For example, the aerosol generating device may include a chamber configured as at least a portion of the receiving cylinder.

[0106] The aerosol generating device may include an air inlet. The aerosol generating device may include an air outlet. When the aerosol generating device is connected to the cylinder, the air outlet of the aerosol generating device may be in fluid communication with the air inlet of the cylinder.

[0107] A power source can be electrically connected to the first and second electrical contacts of the device. These first and second electrical contacts can be configured to form an electrical connection with corresponding first and second electrical contacts on the cylinder when the cylinder is engaged with the device. These corresponding first and second electrical contacts on the cylinder can be electrically connected to a heating element. Therefore, the power source can be configured to supply power to the heating element by allowing current to flow through it.

[0108] The cylinder or aerosol generating device may include a sensor, such as an induction coil. The heating element may be or may include a sensor material.

[0109] A power source can be configured to pass current (e.g., high-frequency alternating current) through an inductor, causing the inductor to generate a fluctuating or oscillating electromagnetic field. This, in turn, can induce eddy currents and hysteresis losses in the inductor material. This can cause the inductor material to heat up. Therefore, a power source using an inductor can be configured to inductively heat a heating element.

[0110] Suitable receptor materials include those previously mentioned in reference to this disclosure.

[0111] The sensor may be an induction coil. The sensor may be located inside the cylinder. The sensor may be positioned around or around a portion of the heating element. For example, the sensor may be an induction coil and may be spirally positioned around or around a portion of the heating element.

[0112] The sensor can be electrically connected to electrical contacts on the cylinder. When the cylinder is engaged with the aerosol generating device, these electrical contacts can be electrically connected to corresponding electrical contacts on the device, which are in turn connected to a power source in the device. When the cylinder is engaged with the device, the power source of the device can be configured to pass current through the sensor to generate a fluctuating electromagnetic field, thereby heating the sensor material of the heating element.

[0113] A sensor (e.g., an induction coil) may be located within the aerosol generating apparatus. The sensor may be electrically connected to a power source for the aerosol generating apparatus. The aerosol generating apparatus may be configured to engage with a cylinder. For example, the apparatus may include a chamber for receiving at least a portion of the cylinder. The induction coil may be arranged around at least a portion of this chamber. For example, the induction coil may be spiraled around at least a portion of the chamber. Thus, when the cylinder is engaged with the apparatus, the induction coil may be arranged around a heating element or a portion of a heating element, or spiraled around a heating element or a portion of a heating element. When at least a portion of the cylinder is received within the chamber of the apparatus, the power source of the apparatus may be configured to pass current through the sensor to generate a fluctuating or oscillating electromagnetic field, thereby heating the sensor material of the heating element.

[0114] As mentioned above, induction heating advantageously allows for the production of simple, inexpensive, and robust cylinders. Furthermore, compared to resistance heating, induction heating offers improved energy conversion.

[0115] Aerosol generation systems can be smoking systems, such as electrically operated smoking systems. Aerosol generation systems can also be used for recreational purposes. In use, aerosol generation systems can be adapted to deliver or be configured to deliver nicotine to a user.

[0116] The aerosol generation system can be portable. The aerosol generation system can have a size comparable to a conventional cigar or cigarette. The smoking system can have an overall length between 30 mm and 200 mm. The smoking system can have an outer diameter between 5 mm and 30 mm.

[0117] As used herein, the term "aerosol" refers to a dispersion of solid particles or droplets, or a combination of solid particles and droplets, in a gas. Aerosols can be visible or invisible. Aerosols can include vapors of substances that are typically liquid or solid at room temperature, as well as solid particles or droplets, or a combination of solid particles and droplets.

[0118] As used herein, the term "aerosol-forming matrix" refers to a matrix capable of releasing volatile compounds that can form aerosols. These volatile compounds can be released by heating or burning the aerosol-forming matrix.

[0119] The aerosol forming matrix can include a variety of compounds. These compounds can have different boiling points. For example, the aerosol forming matrix can include: a first compound having a first boiling point at atmospheric pressure; and a second compound having a second boiling point at atmospheric pressure, wherein the first boiling point is greater than the second boiling point.

[0120] Aerosol forming matrices may include aerosol forming agents. As used herein, the term "aerosol forming agent" refers to any suitable compound or mixture of compounds that promotes the formation of aerosols during use, such as stable aerosols that are substantially resistant to thermal degradation at the system's operating temperature. Suitable aerosol forming agents are well known in the art and include, but are not limited to: polyols, such as triethylene glycol, 1,3-butanediol, and glycerol; esters of polyols, such as mono, di, or triacetic acid esters of glycerol; and aliphatic esters of mono, di, or polycarboxylic acids, such as dimethyl dodecanoate and dimethyl tetradecanoate.

[0121] The aerosol-forming matrix may include nicotine. The aerosol-forming matrix may include water. The aerosol-forming matrix may include glycerol, also known as glycerol, which has a higher boiling point than nicotine. The aerosol-forming matrix may include plant-based materials. The aerosol-forming matrix may include homogenized plant-based materials. The aerosol-forming matrix may include tobacco. The aerosol-forming matrix may include tobacco-containing materials. Tobacco-containing materials may contain volatile tobacco flavor compounds. These compounds can be released from the aerosol-forming matrix upon heating. The aerosol-forming matrix may include homogenized tobacco materials. The aerosol-forming matrix may include other additives and ingredients, such as flavorings.

[0122] As used herein, the term "liquid aerosol forming matrix" refers to an aerosol forming matrix in a concentrated form. Therefore, a "liquid aerosol forming matrix" can be or may include one or more of a liquid, a gel, or a slurry. If the liquid aerosol forming matrix is ​​or includes a gel or slurry, the gel or slurry may liquefy upon heating. For example, a gel or slurry may liquefy upon heating to temperatures below 50, 75, 100, 150, or 200 degrees Celsius.

[0123] The terms hot zone and supply zone can be used interchangeably with the first space and the second space, respectively.

[0124] As used herein, unless otherwise expressly stated, the term "reservoir" may refer to either a reservoir for storing liquid aerosol forming matrix or a reservoir for liquid aerosol forming matrix. Unless otherwise expressly stated, the term "reservoir" may refer to either a reservoir for storing free-flowing liquid aerosol forming matrix or a reservoir for free-flowing liquid aerosol forming matrix.

[0125] The invention is defined in the claims. However, a non-exhaustive list of non-limiting examples is provided below. Any one or more features of these embodiments may be combined with any one or more features of another example, embodiment, or aspect described herein.

[0126] Example Ex1. A cylinder for use in an aerosol generation system, the cylinder comprising:

[0127] A reservoir for liquid aerosol-forming matrix;

[0128] Heating element for heating the liquid aerosol forming matrix from the reservoir; and wall,

[0129] A thermal zone is formed in the first space between the wall and the heating element, adjacent to the heating element.

[0130] Furthermore, a supply area is formed in the second space adjacent to the heating element.

[0131] Furthermore, the reservoir is in fluid communication with the supply area and the hot area.

[0132] Example Ex2. The cylinder according to Ex1, wherein in use, the hot zone is heated to a first temperature and the supply zone is heated to a second temperature, and the first temperature is greater than the second temperature.

[0133] Example Ex3. The cylinder according to Ex2, wherein the first temperature is at least 5 degrees Celsius higher than the second temperature.

[0134] Example Ex4. A cylinder according to any of the preceding examples, wherein the wall is located within the reservoir.

[0135] Example Ex5. A cylinder according to any of the preceding examples, wherein the wall thermally isolates the hot zone from the reservoir.

[0136] Example Ex6. A cylinder according to any of the preceding examples, wherein the wall thermally isolates the supply area from the reservoir to a lesser extent than the wall thermally isolates the hot area from the reservoir.

[0137] Example Ex7. A cylinder according to any of the foregoing examples, wherein, in use, a liquid aerosol forming matrix is ​​conveyed from the reservoir toward the heating element via the supply area.

[0138] Example Ex8. A cylinder according to any of the preceding examples, wherein, in use, the liquid aerosol forming matrix is ​​transported from the reservoir to the hot zone via the supply area.

[0139] Example Ex9. A cylinder according to any of the foregoing examples, the cylinder includes an air inlet and an air outlet, and an airflow path is defined between the air inlet and the air outlet.

[0140] Example Ex10. The cylinder according to Ex9, wherein air drawn from the air inlet to the air outlet flows through, passes through, or passes through the heating element.

[0141] Example Ex11. A cylinder according to Ex9 or Ex10, wherein the heating element surrounds a portion of the airflow path.

[0142] Example Ex12. A cylinder according to any of the foregoing examples, wherein the heating element comprises a first part and a second part.

[0143] Example Ex13. The cylinder according to Ex12, wherein the first portion is configured to be heated to a higher temperature than the second portion.

[0144] Example Ex14. The cylinder according to Ex12 or Ex13, wherein the first portion has a first resistance and the second portion has a second resistance, the first resistance being greater than the second resistance.

[0145] Example Ex15. A cylinder according to any one of Examples Ex12 to Ex14, wherein the second portion includes a folded section in contact with itself.

[0146] Example Ex16. A cylinder according to any one of Examples Ex12 to Ex15, wherein the first part includes one or more of a curved portion, a folded portion, a corrugated portion, and an undulating portion.

[0147] Example Ex17. A cylinder according to any one of Examples Ex12 to Ex16, wherein the first portion is positioned closer to the hot region than the second portion.

[0148] Example Ex18. A cylinder according to any one of Examples Ex12 to Ex17, wherein the second portion is positioned closer to the supply area than the first portion.

[0149] Example Ex19. The cylinder according to any of the foregoing examples includes a support for the heating element.

[0150] Example Ex20. The cylinder according to Ex19, wherein the wall forms the support.

[0151] Example Ex21. A cylinder according to any one of Examples Ex12 to Ex18, wherein the wall forms a support for the heating element, and a second portion of the heating element contacts the wall.

[0152] Example Ex22. A cylinder according to any of the foregoing examples, wherein, in use, the liquid aerosol forming matrix in the supply region is evaporated and the liquid aerosol forming matrix in the hot region is evaporated.

[0153] Example Ex23. A cylinder according to any of the preceding examples, wherein the second space is between the wall and the heating element.

[0154] Example Ex24. A cylinder according to any of the preceding examples, wherein the shortest distance between the wall passing through the hot zone and the heater is less than the shortest distance between the wall passing through the supply zone and the heater.

[0155] Example Ex25. The cylinder according to any of the preceding examples, wherein the heating element is a mesh heating element.

[0156] Example Ex26. A cylinder according to any of the preceding examples, wherein the wall is configured to retain a liquid aerosol forming matrix.

[0157] Example Ex27. A cylinder according to any of the foregoing examples, wherein, in use, a liquid aerosol forming matrix can be transferred from the reservoir through the wall and toward the heating element.

[0158] Example Ex28. A cylinder according to any of the foregoing examples, wherein, in use, a liquid aerosol forming matrix can be transferred from the reservoir through the wall and toward the hot zone.

[0159] Example Ex29. A cylinder according to any of the preceding examples, wherein the wall comprises a porous material.

[0160] Example Ex30. A cylinder according to any of the foregoing examples, wherein the wall comprises a capillary retaining material.

[0161] Example Ex31. A cylinder according to any of the foregoing examples, wherein the thermal conductivity of the wall is less than the thermal conductivity of the liquid aerosol forming matrix.

[0162] Example Ex32. The cylinder according to any of the preceding examples, wherein the shortest distance between the hot zone and the heating element is equal to the shortest distance between the supply zone and the heating element.

[0163] Example Ex33. An aerosol generation system comprising a cylinder according to any of the foregoing examples.

[0164] Example Ex34: The aerosol generation system according to Ex33, the system includes an aerosol generation device.

[0165] Example Ex35: An aerosol generating system according to Ex34, wherein the cylinder is configured to engage with and disengage from the aerosol generating device.

[0166] Example Ex36: An aerosol generating system according to any one of Examples Ex33, Ex34 or Ex45, wherein the aerosol generating system includes a power source configured to supply power to the heating element to heat the heating element.

[0167] Example Ex37: An aerosol generating system according to Ex34 or Ex35, wherein the aerosol generating device includes a power source configured to supply power to the heating element to heat the heating element.

[0168] Example Ex38: An aerosol generation system according to Ex36 or Ex37, wherein the power source is configured to supply power to the heating element to resistively heat the heating element.

[0169] Example Ex39: An aerosol generation system according to Ex36 or Ex37, wherein the power source is configured to supply power to the heating element to inductively heat the heating element.

[0170] Example Ex40: An aerosol generating system according to any one of Examples Ex33 to Ex39, wherein the aerosol generating system has a total length between 30 mm and 200 mm.

[0171] Example Ex41: An aerosol generating system according to any one of Examples Ex33 to Ex40, wherein the aerosol generating system has an outer diameter between 5 mm and 30 mm.

[0172] Example Ex42: An aerosol generating system according to any one of Examples Ex33 to Ex41, wherein the aerosol generating system is portable.

[0173] Example Ex43: An aerosol generating system according to any one of Examples Ex33 to Ex42, wherein the aerosol generating system is a smoking system. Attached Figure Description

[0174] Several examples will now be described further with reference to the accompanying drawings, in which:

[0175] Figure 1 A schematic cross-sectional view of the first aerosol generation system is shown;

[0176] Figure 2 A schematic perspective view of a portion of the cylinder of the first aerosol generation system is shown;

[0177] Figure 3 A schematic cross-sectional view of the second aerosol generation system is shown;

[0178] Figure 4 A schematic cross-sectional view of the third aerosol generation system is shown;

[0179] Figure 5 A schematic cross-sectional view of a portion of the cylinder of the third aerosol generation system is shown; and

[0180] Figure 6 A schematic perspective view of a portion of the cylinder of the third aerosol generation system is shown. Detailed Implementation

[0181] Figure 1 A schematic cross-sectional view of a first aerosol generation system 100 is shown. The aerosol generation system 100 includes an aerosol generation device 150 and a cylinder 200. In this example, the aerosol generation system 100 is an electrically operated smoking system.

[0182] The aerosol generating device 150 is portable and has a size equivalent to that of a conventional cigar or cigarette. Device 150 includes a battery 152 (e.g., a lithium iron phosphate battery) and a controller 154 electrically connected to the battery 152. Device 150 also includes two electrical contacts 156 and 158 electrically connected to the battery 152. This electrical connection is wired and... Figure 1 Not shown in the image.

[0183] The cylinder 200 includes a first electrical contact 214 and a second electrical contact 216, an air inlet 202, an air outlet 204, a reservoir 303 for forming a liquid aerosol matrix, a heating element 304, and a wall 307. The air inlet 202 is in fluid communication with the air outlet 204. The heater assembly 300 is positioned downstream of the air inlet 202 and upstream of the air outlet 204. The first electrical contact 214 and the second electrical contact 216 are electrically connected to the heating element 304.

[0184] In this system 100, the liquid aerosol forming matrix comprises approximately 74% by weight glycerol, 24% by weight propylene glycol, and 2% by weight nicotine, although any suitable matrix can be used. Nicotine has a boiling point of approximately 247°C at atmospheric pressure, glycerol has a boiling point of approximately 290°C, and propylene glycol has a boiling point of approximately 188°C. Therefore, when this liquid aerosol forming matrix is ​​initially heated to form an aerosol, some systems may undesirably evaporate a disproportionate amount of propylene glycol (which has the lowest boiling point of the matrix-forming compounds). This may result in less desirable aerosols being delivered to the user, such as aerosols comprising a smaller proportion of nicotine than desired. It may also undesirably alter the relative proportions of the compounds in the matrix over longer periods. The present invention can eliminate or at least reduce these undesirable effects.

[0185] Heating element 304 is a resistance grid heating element. In this example, the grid is formed of stainless steel, although any suitable material can be used. Heating element 304 covers the open end of reservoir 303 of the liquid aerosol forming matrix. The grid heating element includes holes small enough to prevent leakage of the liquid aerosol forming matrix during use, but large enough to allow the evaporating liquid aerosol forming matrix to pass through at a suitable flow rate during use. In this example, the holes are substantially square and have a side length of approximately 25 micrometers.

[0186] The cylinder 200 includes a hot zone 306 and a supply zone 308. The hot zone 306 is formed in a first space adjacent to the heating element 304 and between the wall 307 and the heating element 304. The supply zone 306 is formed in a second space adjacent to the heating element 304. The reservoir 303 is in fluid communication with the supply zone 308 and the hot zone 306.

[0187] Wall 307 is formed of a non-porous, impermeable material. Figure 1 In the example shown, wall 307 is formed of polyethylene terephthalate, although any suitable material can be used.

[0188] Wall 307 forms the boundary of the contraction channel 310 that connects the reservoir 303 to the supply area 308. Figure 1 In the example shown, the liquid aerosol forming matrix from the reservoir 303 must pass through the contraction channel 310 and then through the supply region 308 to reach the hot region 306.

[0189] The surface of wall 307 opposite to heating element 304 is not parallel to the heating surface of heating element 304. The surface of wall 307 opposite to heating element 304 tapers toward heating element 304 in the direction from supply region 308 to hot region 306. Therefore, the minimum and average distances from heating element 304 through hot region 306 to wall 307 are less than the minimum and average distances from heating element 304 through supply region 308 to wall 307.

[0190] The hot zone 306 is more thermally isolated than the supply zone 308. For example, the hot zone 306 is more thermally isolated from the reservoir 303 than the supply zone 308. Therefore, less heat will be dissipated from the hot zone 306 into the reservoir 303 compared to the heat dissipated from the supply zone 308 into the reservoir 303.

[0191] Wall 307 has a significantly lower thermal conductivity than the liquid aerosol forming matrix. Therefore, wall 307 effectively thermally insulates the hot region 306 and the supply region 308 from the reservoir 303 of the liquid aerosol forming matrix. Due to the taper of wall 307, the portion of wall 307 in contact with the supply region 308 is thinner than the portion of wall 307 in contact with the hot region 306. Therefore, the degree to which wall 307 thermally insulates the supply region 308 from the reservoir 303 is less than the degree to which wall 307 thermally insulates the hot region 306 from the reservoir 303.

[0192] exist Figure 1 In this embodiment, the aerosol generating device 150 is engaged with the cylinder 200. In this example, the cylinder 200 is engaged with the aerosol generating device 150 by mates the thread 206 of the cylinder 200 with the corresponding thread 162 of the aerosol generating device 150.

[0193] In use, the user draws air through the air outlet 204 of the cylinder 200. Simultaneously, the user presses a button (not shown) on the aerosol generating device 150. Pressing this button sends a signal to the controller 154, which in turn supplies power from the battery 152 to the heating element 304 via the device's electrical contacts 156, 158 and the cylinder's electrical contacts 214, 216. This causes current to flow through the heating element 304, thereby resistively heating it. In other instances, an airflow sensor or pressure sensor is located in the cylinder 200 and electrically connected to the controller 154. The airflow sensor or pressure sensor detects that the user is drawing air through the air outlet 204 of the cylinder 200 and sends a signal to the controller 154 to provide power to the heating element 304. In these instances, the user therefore does not need to press a button to heat the heating element 304.

[0194] When heating element 304 is heated, the temperatures of supply region 308 and hot region 306 increase. Hot region 306 increases in temperature at a greater rate than supply region 308. Both supply region 308 and hot region 306 reach the temperature at which at least one compound in the liquid aerosol forming matrix evaporates. When heating element 304 is heated, a region with a higher temperature (hot region) and a region with a lower temperature (supply region) are created. Specifically, hot region 306 is heated to a temperature approximately 30 degrees Celsius higher than supply region 308. Many factors contribute to this temperature difference.

[0195] exist Figure 1 In the illustrated example, the liquid aerosol forming matrix in reservoir 303 must flow through contraction channel 310 and then through supply region 308 to reach hot region 306. Therefore, when the liquid aerosol forming matrix in hot region 306 evaporates, liquid aerosol forming matrix from supply region 308 replaces it. Thus, preheated liquid aerosol forming matrix replaces the liquid aerosol forming matrix evaporating from hot region 306. In contrast, when the liquid aerosol forming matrix in supply region 308 evaporates, liquid aerosol forming matrix from reservoir 303 replaces it. Therefore, the liquid aerosol forming matrix replacing the liquid aerosol forming matrix evaporating from supply region 308 is not preheated, or at least preheated to a smaller extent than the liquid aerosol forming matrix replacing the liquid aerosol forming matrix evaporating from hot region 306. This increases the temperature difference between hot region 306 and supply region 308.

[0196] The generation of regions with higher and lower temperatures allows compounds forming a matrix of liquid aerosols with higher and lower boiling points to evaporate simultaneously in a more preferred proportion and at a more preferred rate.

[0197] When a user draws air into the air inlet 202 of the cylinder 200 through the air outlet 204, air is drawn into the air inlet 202. This air then passes through the heating element 304 and travels toward the air outlet 204. This airflow carries vapor formed from the liquid aerosol matrix in the heated zone 306 and supply zone 308 by the heating element 304. This carried vapor then cools and condenses to form an aerosol. This aerosol is then delivered to the user via the air outlet 204. Figure 1 Arrows have been used to indicate the direction of airflow when the user draws air at air outlet 204.

[0198] Figure 2 A schematic perspective view of a portion of the cylinder is shown. Specifically, Figure 2 The reservoir 303, heating element 304, and wall 307 are shown. Figure 2The image shows an enlarged view of a portion of the heating element 304. This illustrates the structure of the grid heating element.

[0199] Figure 3 A schematic cross-sectional view of a second aerosol generation system 400 is shown. The aerosol generation system 400 includes an aerosol generation device 450 and a cylinder 500. In this example, the aerosol generation system 400 is an electrically operated smoking system.

[0200] The aerosol generating device 450 is portable and has a size equivalent to that of a conventional cigar or cigarette. Device 450 includes a battery 452 (e.g., a lithium iron phosphate battery) and a controller 454 electrically connected to the battery 452. Device 450 also includes an induction coil 456 electrically connected to the battery 452. Device 450 also includes an air inlet 458 and an air outlet 460 in fluid communication with the air inlet 458.

[0201] The cylinder 500 includes a reservoir 303 for a liquid aerosol forming matrix, a heating element 304, a wall 307, a heated zone 306, a supply zone 308, and a contraction channel 310. The reservoir 303, heating element 304, wall 307, heated zone 306, supply zone 308, and contraction channel 310 are all related to... Figure 1 The components shown and described in the first example are the same. However, Figure 3 In the example shown, the heating element 304 is configured to be induction heated.

[0202] Cylinder 500 includes an air inlet 502 and an air outlet 504. The air inlet 502 and air outlet 504 are in fluid communication. A heating element 304 is positioned downstream of the air inlet 502 and upstream of the air outlet 504. When cylinder 500 is engaged with aerosol generating device 450, as... Figure 3 As shown, the air outlet 460 of the device 450 is adjacent to the air inlet 502 of the cylinder 500. Therefore, in use, when the user draws air at the air outlet 504 of the cylinder 500, the airflow passes through the air inlet 458 of the device 450, then through the air outlet 460 of the device 450, then through the air inlet 502 of the cylinder 500, then through the heating element 304, and then through the air outlet 504 of the cylinder 500.

[0203] exist Figure 3 In this embodiment, the cylinder 500 is engaged with the aerosol generating device 450. In this example, the cylinder 500 is engaged with the aerosol generating device 450 via holes 506 and 508, which form a snap-fit ​​connection with corresponding protrusions 462 and 464 on the aerosol generating device 450.

[0204] exist Figure 3In the example shown, heating element 304 is configured to be induction heated rather than resistively heated. Therefore, the stainless steel material of heating element 304 is used as the sensor material. However, it is worth noting that any suitable sensor material can be used.

[0205] In use, the user draws air through the air outlet 504 of the cylinder 500. Simultaneously, the user presses a button (not shown) on the aerosol generating device 450. Pressing this button sends a signal to the controller 454, which causes the battery 452 to supply a high-frequency current to the induction coil 456. This causes the induction coil 456 to generate a fluctuating or oscillating electromagnetic field. The heating element 304 is positioned within this field. Therefore, this fluctuating electromagnetic field generates eddy currents and hysteresis losses in the heating element 304. The heating element 304 is thus inductively heated. In other instances, an airflow sensor or pressure sensor is located in the device 450 and electrically connected to the controller 454. The airflow sensor or pressure sensor detects that the user is drawing air through the air outlet 504 of the cylinder 500 and sends a signal to the controller 454 to supply a high-frequency current to the induction coil 456, thus heating the heating element 304. In these instances, the user therefore does not need to press a button to heat the first heating element 604 and the second heating element 605.

[0206] When heating element 304 is heated, the temperatures of supply region 308 and hot region 306 increase. Hot region 306 increases in temperature at a greater rate than supply region 308. Both supply region 308 and hot region 306 reach the temperature at which at least one compound in the liquid aerosol forming matrix evaporates. When heating element 304 is heated, a region with a higher temperature (hot region) and a region with a lower temperature (supply region) are created. Specifically, hot region 306 is heated to a temperature approximately 30 degrees Celsius higher than supply region 308. Many factors contribute to this temperature difference.

[0207] Due to the tapering of the wall 307, the hot zone 306 is on average closer to the heating element 304 than the supply zone 308.

[0208] The hot zone 306 is more thermally isolated than the supply zone 308. For example, the hot zone 306 is more thermally isolated from the reservoir 303 than the supply zone 308. Therefore, less heat will be dissipated from the hot zone 306 into the reservoir 303 compared to the heat dissipated from the supply zone 308 into the reservoir 303.

[0209] exist Figure 3 In the examples shown, such as in Figure 1In the illustrated example, the liquid aerosol forming matrix in reservoir 303 must flow through contraction channel 310 and then through supply region 308 to reach hot region 306. Therefore, when the liquid aerosol forming matrix in hot region 306 evaporates, liquid aerosol forming matrix from supply region 308 replaces it. Thus, preheated liquid aerosol forming matrix replaces the liquid aerosol forming matrix evaporating from hot region 306. In contrast, when the liquid aerosol forming matrix in supply region 308 evaporates, liquid aerosol forming matrix from reservoir 303 replaces it. Therefore, the liquid aerosol forming matrix replacing the liquid aerosol forming matrix evaporating from supply region 308 is not preheated, or at least preheated to a smaller extent than the liquid aerosol forming matrix replacing the liquid aerosol forming matrix evaporating from hot region 306. This increases the temperature difference between hot region 306 and supply region 308.

[0210] The generation of regions with higher and lower temperatures allows compounds forming a matrix of liquid aerosols with higher and lower boiling points to evaporate simultaneously in a more preferred proportion and at a more preferred rate.

[0211] When a user draws air through the air outlet 504 of the cylinder 500, air is drawn into the air inlet 458 of the device 450, then through the air outlet 460 of the device 450, and then through the air inlet 502 of the cylinder 500. This air then passes through the heating element 304 and travels toward the air outlet 504. This airflow carries vapor formed by the liquid aerosol matrix heated by the heating element 304. The carried vapor then cools and condenses to form an aerosol. This aerosol is then delivered to the user via the air outlet 504.

[0212] Figure 4 A schematic cross-sectional view of a third aerosol generation system 600 is shown. The aerosol generation system 600 includes an aerosol generation device 650 and a cylinder 700. In this example, the aerosol generation system 600 is an electrically operated smoking system.

[0213] The aerosol generating device 650 is portable and has a size equivalent to that of a conventional cigar or cigarette. Device 650 includes a battery 652 (e.g., a lithium iron phosphate battery) and a controller 654 electrically connected to the battery 652. Device 650 also includes two electrical contacts 656 and 658 electrically connected to the battery 652. This electrical connection is wired and... Figure 4 Not shown in the image.

[0214] The cylinder 700 includes a first electrical contact 714 and a second electrical contact 716, an air inlet 702, an air outlet 704, a reservoir 803 for forming a liquid aerosol matrix, a heating element 804, and a wall 807. The air inlet 702 is in fluid communication with the air outlet 704. The heating element 804 is positioned downstream of the air inlet 702 and upstream of the air outlet 704. The first electrical contact 714 and the second electrical contact 716 are electrically connected to the heating element 804.

[0215] In this system 600, the liquid aerosol forming matrix comprises approximately 98% glycerol by weight and 2% nicotine by weight, although any suitable matrix can be used. Nicotine has a boiling point of approximately 247 degrees Celsius at atmospheric pressure, and glycerol has a boiling point of approximately 290 degrees Celsius. Therefore, when this liquid aerosol forming matrix is ​​initially heated to form an aerosol, some systems may undesirably evaporate disproportionately large amounts of nicotine (which has the lowest boiling point of the matrix-forming compounds). This may result in an undesirable aerosol being delivered to the user. It may also undesirably alter the relative proportions of the compounds in the matrix over a longer period. The present invention can eliminate or at least reduce these undesirable effects.

[0216] Heating element 804 is a resistance grid heating element. In this example, the grid is formed of stainless steel, although any suitable material can be used. Heating element 804 substantially completely defines the airflow path from air inlet 702 to air outlet 704. Specifically, heating element 804 defines approximately 355 degrees of the airflow path. The grid heating element includes holes small enough to prevent leakage of the liquid aerosol forming matrix during use, but large enough to allow the passage of evaporating liquid aerosol forming matrix at a suitable flow rate during use. In this example, the holes are substantially square and have a side length of approximately 25 micrometers.

[0217] Cylinder 700 includes multiple heating zones and multiple supply zones. Reference will now be made to... Figure 5 Describe these areas in more detail.

[0218] Figure 5 This is a schematic cross-sectional view of a portion of the cylinder of the third aerosol generation system. Figure 5 The sectional view shown is with Figure 4 The view shown is a vertical view. Specifically, Figure 5 The view shown is by Figure 4 The sectional view is indicated by line AA in the diagram.

[0219] Figure 5 A reservoir 803 for forming a liquid aerosol matrix is ​​shown, defined by container 805. Figure 5The diagram also shows heating element 804, first hot zone 806, second hot zone 816, third hot zone 826, first supply zone 808, second supply zone 818, third supply zone 828, fourth supply zone 838, and wall 807, which forms the boundaries of first contraction channel 810, second contraction channel 820, third contraction channel 830, and fourth contraction channel 840. A reservoir 803 for the liquid aerosol forming matrix is ​​in fluid communication with all supply and hot zones.

[0220] In use, the liquid aerosol forming matrix can flow from the reservoir 803 through the first contraction channel 810, then through the first supply region 808, and then to the first hot region 806. The first supply region 808 is adjacent to the heating element 804 and positioned between the heating element 804 and the wall 807. The first hot region 806 is adjacent to the heating element 804 and positioned between the heating element 804 and the wall 804. The portion 8041 of the heating element 804 adjacent to the first supply region 808 and the first hot region 806 is curved, such that the minimum distance from the heating element 804 through the first hot region 806 to the wall 807 is less than the minimum distance from the heating element 804 through the first supply region 808 to the wall 807. This allows the first hot region 806 to be heated to a higher temperature than the first supply region 808.

[0221] In use, the liquid aerosol forming matrix can flow from the reservoir 803 through the second contraction channel 820, then through the second supply region 818, and then to the second hot region 816. The second supply region 818 is adjacent to the heating element 804 and positioned between the heating element 804 and the wall 807. The second hot region 816 is adjacent to the heating element 804 and positioned between the heating element 804 and the wall 804. The portion 8042 of the heating element 804 adjacent to the second hot region 816 includes a plurality of undulations. These undulations increase the volume and surface area of ​​the heating element 804 immediately adjacent to the second hot region 816. This allows the second hot region 816 to be heated to a higher temperature than the second supply region 818.

[0222] In use, the liquid aerosol forming matrix can flow from the reservoir 803 through the third contraction channel 830, then through the third supply region 828, and then to the third hot region 826. The third supply region 828 is adjacent to the heating element 804 and positioned between the heating element 804 and the wall 807. The third hot region 826 is adjacent to the heating element 804 and positioned between the heating element 804 and the wall 804. The portion 8043 of the heating element 804 adjacent to the third supply region 828 and the third hot region 826 varies in thickness. Specifically, the thickness variation is such that the minimum thickness of the heating element 804 adjacent to the third hot region 826 is about 50% smaller than the minimum thickness of the heating element 804 adjacent to the third supply region 828. The thinner portion of the heating element 804 may have increased resistance and can therefore be resistively heated to a higher temperature in use. This allows the third hot region 826 to be heated to a higher temperature than the third supply region 828.

[0223] The wall 807 of the cylinder forms four supports for the heating element 804. Sections 851, 852, 853, and 854 of the heating element 804 contact each support.

[0224] Each segment 851, 852, 853, 854 of the heating element 804 in contact with the support is folded to contact itself. Each folded segment 851, 852, 853, 854 therefore has lower resistance and is heated to a lower temperature compared to when each segment 851, 852, 853, 854 is not folded to contact itself. Therefore, each segment 851, 852, 853, 854 of the heating element 804 dissipates less heat into the reservoir 803 of the liquid aerosol forming matrix.

[0225] Wall 807 is formed of a porous material. Figure 5 In the example shown, wall 807 is formed of a porous ceramic material, particularly alumina, although any suitable material can be used. Therefore, the liquid aerosol forming matrix can be transferred from reservoir 803 through wall 807 and into one of supply regions 808, 818, 828 or hot regions 806, 816, 826. This helps prevent any of supply regions 808, 818, 828 or hot regions 806, 816, 826 from drying out as the liquid aerosol forming matrix evaporates. The porosity and pore size distribution of wall 807 are selected to allow an appropriate flow rate of liquid from reservoir 803 through wall 807 during use. Figure 5In the example shown, the porosity of wall 807 is approximately 50%. As used herein, the term "porosity" is a measure, expressed as a percentage, of the volume of accessible pores or voids in a wall divided by the total volume of the wall. Porosity is measured here by mercury porosimetry. Pores of various shapes and sizes can exist in wall 807. Figure 5 In the example shown, the pores in wall 807 have an average pore size of approximately 30 micrometers. The pore size distribution is defined as the statistical distribution of the diameter of the largest sphere that can fit inside a pore at a given point. As used herein, the term "average pore size" refers to the average value of this pore size distribution. The pore sizes mentioned herein were obtained using mercury porosimetry.

[0226] Although wall 807 is porous, a significant proportion of the liquid aerosol forming matrix traveling from reservoir 803 to hot regions 806, 816, 826 travels through supply regions 808, 818, 828. Therefore, much of the liquid aerosol forming matrix reaching hot regions 806, 816, 826 is preheated. This can help increase or maintain the temperature difference between the liquid aerosol forming matrix in hot regions 806, 816, 826 and the liquid aerosol forming matrix in supply regions 808, 818, 828.

[0227] The wall 807 has a thermal conductivity significantly lower than that of the liquid aerosol forming matrix. Therefore, the wall 807 effectively thermally isolates the hot regions 806, 816, 826 and the supply regions 808, 818, 828 from the reservoir 803 of the liquid aerosol forming matrix.

[0228] Figure 6 It shows Figure 5 A schematic perspective view of a portion of the cylinder shown in the figure. Figure 6 The diagram shows one of the following components: a reservoir 803, a container 805, a heating element 804, a wall 807, and the aforementioned support 809, forming a liquid aerosol matrix.

[0229] Return to reference Figure 4 The aerosol generating device 650 is engaged with the cylinder 700. In this example, the cylinder 700 is engaged with the aerosol generating device 650 by mates the thread 706 of the cylinder 700 with the corresponding thread 662 of the aerosol generating device 650.

[0230] In use, the user draws air through the air outlet 704 of the cylinder 700. Simultaneously, the user presses a button (not shown) on the aerosol generating device 650. Pressing this button sends a signal to the controller 654, which in turn supplies power from the battery 652 to the heating element 804 via the device's electrical contacts 656, 658 and the cylinder's electrical contacts 714, 716. This causes current to flow through the heating element 804, thereby resistively heating it. In other instances, an airflow sensor or pressure sensor is located in the cylinder 700 and electrically connected to the controller 654. The airflow sensor or pressure sensor detects that the user is drawing air through the air outlet 704 of the cylinder 700 and sends a signal to the controller 654 to provide power to the heating element 804. In these instances, the user therefore does not need to press a button to heat the heating element 804.

[0231] When heating element 804 is heated, the temperatures of supply regions 808, 818, 828 and hot regions 806, 816, 826 increase. All supply regions 808, 818, 828 and hot regions 806, 816, 826 reach the temperature at which at least one compound in the liquid aerosol forming matrix evaporates. When heating element 804 is heated, regions with higher temperatures (hot regions) and regions with lower temperatures (supply regions) are generated.

[0232] The generation of regions with higher and lower temperatures allows compounds forming a matrix of liquid aerosols with higher and lower boiling points to evaporate simultaneously in a more preferred proportion and at a more preferred rate.

[0233] When a user draws air into the air outlet 704 of the cylinder 700, air is drawn into the air inlet 702. This air then passes through the heating element 804 and travels towards the air outlet 704. This airflow carries vapor formed by the liquid aerosol matrix heated by the heating element 804. This carried vapor then cools and condenses to form an aerosol. This aerosol is then delivered to the user via the air outlet 704. Figure 1 In the image, the arrow indicates the direction of airflow when the user draws air at air outlet 704.

[0234] The cylinder described herein achieves both high-temperature and low-temperature regions within the liquid aerosol forming matrix. Advantageously, this improves control over the evaporation of different compounds within the liquid aerosol forming matrix. This promotes the simultaneous evaporation of liquid aerosol forming matrix compounds with higher and lower boiling points in a more preferred proportion and at a more preferred rate. This allows for the generation of aerosols with a more desirable composition and more consistent generation of aerosols with the desired composition.

[0235] 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 therein, which may or may not be specifically listed herein. Thus, in this document, the number A is understood to be ±10% of A. In this document, the number A may be considered to include a value within the general standard error of the measurement of the property modified by the number A. In some cases as used in the appended claims, the number A may deviate from the percentage listed above, provided that the amount of deviation from A does not significantly 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 therein, which may or may not be specifically listed herein.

Claims

1. A cylinder for use in an aerosol generation system, the cylinder comprising: A reservoir for liquid aerosol forming matrix; A heating element for heating a liquid aerosol forming matrix from the reservoir; as well as The wall comprises a porous material, wherein: A thermal zone is formed adjacent to the heating element and in the first space between the wall and the heating element. A supply area is formed in the second space adjacent to the heating element. The reservoir is in fluid communication with the supply area and the heat area. At least a portion of the wall is located between the thermal zone and the reservoir. The wall contacts the hot zone and the reservoir, and The portion of the wall that contacts the supply area is thinner than the portion of the wall that contacts the heat area. In use, the hot zone is heated to a first temperature and the supply zone is heated to a second temperature, wherein the first temperature is greater than the second temperature.

2. The cylinder according to claim 1, wherein the wall thermally isolates the supply area from the reservoir to a lesser extent than the wall thermally isolates the hot area from the reservoir.

3. The cylinder according to claim 1 or 2, the cylinder comprising an air inlet and an air outlet, an airflow path defined between the air inlet and the air outlet, and the heating element defining a portion of the airflow path.

4. The cylinder according to claim 1 or 2, wherein the heating element comprises a first portion and a second portion, and the first portion is configured to be heated to a higher temperature than the second portion.

5. The cylinder of claim 4, wherein the first portion is positioned closer to the hot region than the second portion, or wherein the second portion is positioned closer to the supply region than the first portion, or wherein the first portion is positioned closer to the hot region and the second portion is positioned closer to the supply region than the first portion.

6. The cylinder according to claim 1 or 2, wherein the shortest distance between the wall passing through the hot zone and the heating element is less than the shortest distance between the wall passing through the supply zone and the heating element.

7. The cylinder according to claim 1 or 2, wherein at least a portion of the wall is located between the supply area and the reservoir.

8. The cylinder according to claim 1 or 2, wherein the supply area is adjacent to an opening in the wall.

9. The cylinder according to claim 1 or 2, wherein the cylinder includes a contraction channel connecting the reservoir to the supply area.

10. The cylinder according to claim 1 or 2, comprising a support for the heating element.

11. The cylinder according to claim 1 or 2, wherein the second space is between the wall and the heating element.

12. The cylinder according to claim 1 or 2, wherein the thermal conductivity of the wall is less than the thermal conductivity of the liquid aerosol forming matrix.

13. An aerosol generation system comprising a cylinder according to any one of claims 1 to 12.

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