Aerosol-generating articles with disruptive elements

Abstract

Aerosol generating article (100), comprising an aerosol generating substrate (10) and an upstream element (20) located upstream of the aerosol generating substrate (10), the upstream element (20) having a longitudinal airflow channel (24) and an obstruction element (26) for blocking the longitudinal airflow channel (24), wherein the upstream element (20) is configured to change state from an initial state in which the longitudinal airflow channel (24) is substantially blocked by the obstruction element (26) when the aerosol generating article (10) is heated during use, thereby allowing airflow to pass through the longitudinal airflow channel (24), to a final state in which the longitudinal airflow channel (24) is at least partially opened, thereby allowing airflow to pass through the longitudinal airflow channel (24), and the upstream element (20) has a smaller draw resistance in the final state compared to the initial state.

Description

Technical Field

[0001] The present disclosure relates to an aerosol generating article comprising an aerosol generating substrate for generating an aerosol that can be inhaled upon heating. The present disclosure also relates to an aerosol generating system comprising an aerosol generating article and an aerosol generating device configured to heat the aerosol generating substrate of the aerosol generating article.

Background Art

[0002] Aerosol generating articles in which an aerosol generating substrate comprising an aerosol generating material such as a tobacco-containing material is heated rather than burned are known in the art. One objective of such “heat-not-burn” aerosol generating articles is to reduce known harmful smoke components of the type generated by the combustion and pyrolytic decomposition of tobacco in conventional cigarettes.

[0003] Typically, in a heat-not-burn aerosol generating article, an aerosol is generated by heat being transferred from a heat source to a physically separated aerosol generating substrate. In use, volatile compounds are released from the aerosol generating substrate by heat transfer from the heat source to the aerosol generating substrate and entrained in the air drawn through the aerosol generating article. As the released compounds cool, they condense to form an aerosol, which is then inhaled by the user.

[0004] One well-known type of heat-not-burn tobacco product or heat-not-burn aerosol generating article, commonly referred to as a heat-not-burn tobacco product, comprises a solid aerosol generating substrate comprising a tobacco material, which upon heating generates an inhalable aerosol.

[0005] Numerous handheld aerosol generators are known in the art, configured to heat the aerosol generating substrate of a heated aerosol generating article. Such devices include electrically operated aerosol generators in which an aerosol is generated by heat transfer from one or more electric heating elements of the aerosol generator to the aerosol generating substrate of the heated aerosol generating article. Known handheld electrically operated aerosol generators typically comprise a battery, a control electronic device, and one or more electric heating elements for heating the aerosol generating substrate of a heated aerosol generating article, which is specifically designed for use in an aerosol generator.

[0006] Some known electrically heated aerosol generators include an internal heating element configured to be inserted into the aerosol generating base of a heated aerosol generating article. For example, International Publication No. 2013 / 098410A2 discloses an aerosol generating system comprising an aerosol generating article and an electrically operated aerosol generator having a heating element in the form of a blade inserted into the aerosol generating base of the aerosol generating article.

[0007] Other known electrically operated aerosol generators include one or more external heating elements. For example, International Publication No. 2020 / 115151A1 discloses an aerosol generating system comprising an aerosol generating article and an electrically operated aerosol generating device including external heating elements surrounding the aerosol generating article.

[0008] Electrically operated aerosol generators are also known, which include an inductor configured to inductively heat the aerosol generating substrate of a heated aerosol generating article. For example, International Publication No. 2015 / 176898A1 discloses an aerosol generating system including an aerosol generating article comprising an elongated susceptor in thermal contact with an aerosol generating substrate and an electrically operated aerosol generator having an inductor for heating the aerosol generating substrate. During use, fluctuations or alternating electromagnetic fields generated by the inductor induce eddy currents in the susceptor, causing heating of the susceptor as a result of either or both resistive losses (Joule heating) and / or hysteresis losses (if the susceptor is magnetic). The heat generated in the susceptor is transferred to the aerosol generating substrate by conduction.

[0009] It is known that the aerosol-generating substrate of an aerosol-generating article can absorb moisture from the air, for example, during storage of the aerosol-generating article. The aerosol-generating substrate may absorb moisture from the air until it reaches an equilibrium point, at which point the moisture content of the aerosol-generating substrate may be equal to the relative humidity of the environment.

[0010] When an aerosol-generating article is heated during use, absorbed water may evaporate before nicotine and glycerin in the aerosol-generating article evaporates. The resulting water vapor can carry a considerable amount of energy, potentially increasing the temperature of the aerosol delivered to the user. This can result in an unpleasant sensory experience for the user, at least during the initial inhalation. This phenomenon is called "warm aerosol perception" and can be particularly problematic in warm, humid environments. In some cases, warm aerosol perception can cause users to hesitate to use the aerosol-generating article.

[0011] Aerosol generating articles with an upstream element are known. Some known aerosol generating articles have an upstream element formed from the same material as the mouthpiece element. For example, an aerosol generating article may comprise an upstream element which is a cellulose acetate tow plug and a mouthpiece element which is another cellulose acetate tow plug. It may be difficult for a user to distinguish between the upstream end and the oral end of a known aerosol generating article. A user may inadvertently insert the oral end of the aerosol generating article into the cavity of the aerosol generator, which may result in inefficient heating of the aerosol generating substrate. A user may inhale the upstream end of the aerosol generating article, which may result in a failure to provide the desired mouthfeel or sensory experience.

[0012] After using an aerosol-generating item, the user may not know whether the item has already been heated and is generating aerosols. Subsequent use of the same aerosol-generating item may result in the user receiving a lower-quality aerosol than that generated by an unused item. For example, if a user returns a used aerosol-generating item to its pack for later disposal, and then takes another item from the same pack, the user may inadvertently use an item that has already been used.

[0013] It is desirable to provide aerosol-generating articles that offer improved user experience and better quality of aerosols delivered to the user compared to known aerosol-generating articles. [Overview of the Initiative]

[0014] This disclosure relates to an aerosol generating article comprising an aerosol generating substrate. The aerosol generating article may include an upstream element located upstream of the aerosol generating substrate. The upstream element may include a longitudinal airflow channel. The upstream element may include an obstruction element for blocking the longitudinal airflow channel. The upstream element may be configured to change state when the aerosol generating article is heated during use. The upstream element may be configured to change state from an initial state to a final state. In the initial state, the longitudinal airflow channel may be blocked by the obstruction element. The obstruction element may substantially prevent airflow from passing through the longitudinal airflow channel. In the final state, the longitudinal airflow channel may be at least partially open. The at least partially open longitudinal airflow channel may allow airflow to pass through it. In the final state, the upstream element may have a smaller draw resistance compared to the initial state.

[0015] According to a first aspect of the present disclosure, an aerosol generating article is provided, comprising an aerosol generating substrate and an upstream element located upstream of the aerosol generating substrate, the upstream element comprising a longitudinal airflow channel and an obstruction element for blocking the longitudinal airflow channel, wherein the upstream element is configured to change its state from an initial state in which the longitudinal airflow channel is substantially blocked by the obstruction element when the aerosol generating article is heated during use, thereby preventing airflow from passing through the longitudinal airflow channel, to a final state in which the longitudinal airflow channel is at least partially opened, allowing airflow to pass through the longitudinal airflow channel, and the upstream element in the final state has a smaller draw resistance compared to the initial state.

[0016] This disclosure also relates to an aerosol generating system. The aerosol generating system may include an aerosol generating article as described above. The aerosol generating system may include an aerosol generating device. The aerosol generating device may be configured to heat the aerosol generating substrate of the aerosol generating article.

[0017] A second aspect of the present disclosure provides an aerosol generating system comprising an aerosol generating article according to the first aspect of the present disclosure and an aerosol generating device configured to heat the aerosol generating substrate of the aerosol generating article, wherein the aerosol generating device comprises a housing defining a cavity configured to receive the aerosol generating article.

[0018] When used herein in connection with this disclosure, the term “aerosol-generating article” is used to describe an article comprising an aerosol-generating substrate that is heated to produce an inhalable aerosol for delivery to a user.

[0019] When used herein in connection with this disclosure, the term "aerosol-generating substrate" is used to describe a substrate comprising an aerosol-generating material capable of releasing volatile compounds that can generate aerosols upon heating.

[0020] When used herein in connection with this disclosure, the term “aerosol” is used to describe the dispersion of solid particles, or droplets, or combinations of solid particles and droplets, in a gas. Aerosols may be visible or invisible. Aerosols may include not only vapors of substances that are normally liquid or solid at room temperature, but also solid particles, or droplets of liquid, or combinations of solid particles and droplets of liquid.

[0021] When used herein in connection with this disclosure, the term “aerosol generator” is used to describe a device that interacts with an aerosol-generating substrate of an aerosol-generating article to generate an aerosol.

[0022] The aerosol generating article according to this disclosure has a proximal end from which an aerosol is released through the interior when in use for delivery to the user. The proximal end of the aerosol generating article may also be called the downstream end or mouth end of the aerosol generating article. When in use, the user directly or indirectly inhales the proximal end of the aerosol generating article for the purpose of inhaling the aerosol generated by the aerosol generating article.

[0023] The aerosol-generating article according to this disclosure has an upstream end. The distal end is located on the opposite side from the proximal end. The distal end of the aerosol-generating article may also be referred to as the upstream end of the aerosol-generating article.

[0024] Each component of the aerosol-generating article according to this disclosure may be described as being located either upstream or downstream of each other, based on their relative positions between the proximal end and the distal end of the aerosol-generating article.

[0025] When used herein in connection with this disclosure, the term “longitudinal direction” is used to describe the direction between the upstream and downstream ends of an aerosol-generating article. During use, air is drawn through the aerosol-generating article in the longitudinal direction.

[0026] When used herein in connection with this disclosure, the term “length” is used to describe the maximum dimension of an aerosol-generating article or a component of an aerosol-generating article in the longitudinal direction.

[0027] When used herein in connection with this disclosure, the term “transverse direction” is used to describe a direction perpendicular to the longitudinal axis. Unless otherwise specified, “cross section” of an aerosol-generating article or a component of an aerosol-generating article means a cross-section.

[0028] As used herein in connection with the present disclosure, the term "width" refers to the maximum dimension in the transverse direction of an aerosol-generating article or a component of an aerosol-generating article. When the aerosol-generating article has a substantially circular cross-section, the width of the aerosol-generating article corresponds to the diameter of the aerosol-generating article. When a component of the aerosol-generating article has a substantially circular cross-section, the width of the component of the aerosol-generating article corresponds to the diameter of the component of the aerosol-generating article.

[0029] Unless otherwise stated, the draw resistance (RTD) of an aerosol-generating article or a component of an aerosol-generating article is measured in accordance with ISO 6565-2015 at a temperature of approximately 22 degrees Celsius, a pressure of approximately 101 kPa (approx. 760 Torr), a relative humidity of approximately 60%, and a volume flow rate of approximately 17.5 milliliters per second at the proximal or downstream end of the aerosol-generating article or its component.

[0030] For the purposes of the present disclosure, the draw resistance of an aerosol-generating article when the upstream element is in its final state is considered to be the same as the draw resistance of the aerosol-generating article after changing the state of the upstream element to its final state by heating the aerosol-generating article and then cooling the aerosol-generating article. For example, the draw resistance of an aerosol-generating article when the upstream element is in its final state is considered to be the same as the draw resistance of the aerosol-generating article after the aerosol-generating article is heated during use and then cooled to approximately 22 degrees Celsius.

[0031] Similarly, for the purposes of the present disclosure, the draw resistance of the upstream element when the upstream element is in its final state is considered to be the same as the draw resistance of the upstream element after changing the state of the upstream element to its final state by heating the upstream element and then cooling the upstream element.

[0032] An aerosol generating article according to a first aspect of the present disclosure comprises an upstream element located upstream of an aerosol generating substrate, the upstream element comprising a longitudinal airflow channel and an obstruction element for blocking the longitudinal airflow channel, the upstream element being configured to change state from an initial state in which the longitudinal airflow channel is substantially blocked by the obstruction element, thereby preventing airflow from passing through the longitudinal airflow channel, to a final state in which the longitudinal airflow channel is at least partially opened, allowing airflow to pass through the longitudinal airflow channel, the upstream element having a smaller draw resistance in the final state compared to the initial state.

[0033] By providing an upstream element that has a smaller draw resistance in its final state compared to its initial state, the user's perception of warm aerosols can be mitigated or prevented. Before use of the aerosol-generating article, the upstream element may be in its initial state, and when the aerosol-generating article is heated during use, the upstream element may transition to its final state, and the draw resistance of the upstream element decreases as it transitions from the initial to the final state. This reduction in the draw resistance of the upstream element means that the amount of air drawn into the aerosol-generating article through the upstream element during the user's initial inhalation may be less than the amount of air drawn into the aerosol-generating article through the upstream element during the user's subsequent inhalation. Therefore, during the initial inhalation, less aerosol may be delivered to the user compared to later inhalation. This may help minimize or avoid the delivery of warm aerosols to the user in an unpleasant manner, and may improve the user's sensory experience.

[0034] As further explained below, the aerosol generating article may include a ventilation zone located downstream of the aerosol generating substrate. Air drawn into the aerosol generating article through the ventilation zone may help cool the aerosol flow generated by the aerosol generating substrate before delivery to the user. Increasing the draw resistance of the upstream element may increase the aerosol generating article's aerosol-generating level. Due to the change in the draw resistance of the upstream element with respect to the transition from the initial to the final state, the aerosol generating article may have a greater aerosol-generating level during initial inhalation compared to later inhalation. This may result in a greater cooling effect from the aerosol flow generated by the aerosol generating substrate during initial inhalation compared to later inhalation. This adjustment of the aerosol cooling effect during user experience may eliminate the user's perception of a warm aerosol during initial inhalation and provide an acceptable aerosol at an appropriate temperature during later inhalation. This may improve the user's sensory experience.

[0035] The obstruction element may provide the user with a visual indicator of the upstream end of the aerosol generating article. This may help guide the user to properly insert the upstream end of the aerosol generating article into the cavity of the aerosol generator. Proper insertion of the aerosol generating article into the aerosol generator can optimize the heating of the aerosol generating substrate of the aerosol generating article, thereby improving the quality of the aerosol delivered to the user.

[0036] The user may identify the mouth-side end of the aerosol-generating article and position it in their mouth when using the article. Doing so may provide the user with a desired mouthfeel and sensory experience.

[0037] When an aerosol-generating article is used, the upstream element transitions from an initial state in which the long-axis airflow channel is blocked by an obstructing element to a final state in which the long-axis airflow channel is at least partially open. The transition from the initial state to the final state may provide the user with a visual indication that the aerosol-generating article has been used. Such a visual indication may help the user avoid reusing an already used aerosol-generating article. This may help avoid providing the user with low-quality aerosols.

[0038] The upstream element is configured to change its state from the initial state to the final state when the aerosol-generating article is heated during use.

[0039] The initial state of the upstream element may correspond to the state of the upstream element before use of the aerosol-generating article. For example, the initial state of the upstream element may correspond to the state of the upstream element before heating of the aerosol-generating article by the aerosol generator.

[0040] The upstream element may be in its initial state during the initial period after the heating of the aerosol-generating article begins. For example, the upstream element may be in its initial state for about one minute after the heating of the aerosol-generating article begins. The upstream element may also be in its initial state until immediately after the first, second, or third inhalation by the user.

[0041] The upstream elements may be in their final state for most of the user experience. For example, the upstream elements may be in their final state from approximately the first few minutes after the heating of the aerosol-generating article begins until at least the end of the user experience. The upstream elements may be in their final state from immediately after the user's first, second, or third inhalation until the end of the user experience.

[0042] The faulting element may be made of a heat-sensitive material.

[0043] When the upstream element changes state from the initial state to the final state, the viscosity of the obstruction element may decrease. As a result, the obstruction element may flow out when the upstream element changes state from the initial state to the final state.

[0044] The obstruction element may be absorbed by another component of the upstream element when the upstream element is in its final state. For example, if the upstream element includes a plug made of cellulose acetate tow, the obstruction element may be absorbed by the cellulose acetate tow plug when the upstream element is in its final state.

[0045] The airflow channel in the longitudinal direction may be substantially empty when the upstream element is in its final state. The airflow channel in the longitudinal direction may not be substantially closed when the upstream element is in its final state.

[0046] The fault element may melt when the state of the upstream element changes from the initial state to the final state.

[0047] The melting point of the obstructing element may be selected based on the desired timing of the state change of the upstream element from the initial state to the final state during use of the aerosol generating article. The melting point of the obstructing element may be sufficiently high to avoid the state change of the upstream element from the initial state to the final state during storage of the aerosol generating article and before heating and use of the aerosol generating article. The melting point of the obstructing element may be sufficiently low so that the upstream element changes state from the initial state to the final state, for example, when the aerosol generating article is heated by an aerosol generator. The melting point of the obstructing element may be selected so that the upstream element changes state from the initial state to the final state after a significant amount of water in the aerosol generating substrate has evaporated and before a significant amount of other components of the aerosol generating substrate have vaporized. This may, advantageously, avoid the perception of a warm aerosol and provide the user with a desirable sensory experience and improved aerosol quality. The melting point of the obstructing element may be such that the upstream element changes state from the initial state to the final state immediately after the user's first, second, or third inhalation. The melting point of the obstructing element may be such that, for example, the upstream element changes state from its initial state to its final state approximately one minute after the start of heating of the aerosol generating article by the aerosol generator.

[0048] The faulting element may have a melting point of approximately 40°C to 220°C, approximately 40°C to 150°C, approximately 40°C to 100°C, or approximately 40°C to 80°C.

[0049] The faulting element may have a melting point of approximately 45°C to 220°C, approximately 45°C to 150°C, approximately 45°C to 100°C, or approximately 45°C to 80°C.

[0050] The faulting element may have a melting point of approximately 50°C to 220°C, approximately 50°C to 150°C, approximately 50°C to 100°C, or approximately 50°C to 80°C.

[0051] After the aerosol-generating article has been heated so that the upstream element changes its state to the final state, the obstruction element may solidify as the aerosol-generating article subsequently cools. The shape of the obstruction element when the upstream element is in its final state may be substantially the same as the shape of the obstruction element after the aerosol-generating article has subsequently cooled.

[0052] The shape of the obstruction element after both heating of the aerosol-generating article (so that the upstream element changes its state to the final state) and subsequent cooling of the aerosol-generating article have occurred may differ from the shape of the obstruction element when the upstream element was in its initial state.

[0053] The fault element may be in the form of a solid when the upstream element is in its initial state. The fault element may be in the form of a solid rod when the upstream element is in its initial state.

[0054] The obstruction element may be in the form of a powder when the upstream element is in its initial state. For example, the obstruction element may be in the form of a solid rod made of compressed powder. As another example, the obstruction element may be in the form of a loose powder.

[0055] The obstruction element may be in the form of a gel when the upstream element is in its initial state.

[0056] The obstruction element may be in the form of a liquid when the upstream element is in its final state. The obstruction element may also be in the form of a gel when the upstream element is in its final state.

[0057] The obstructing element may include wax. The obstructing element may include lipids.

[0058] The impedimentary elements may include one or more of stearin, paraffin, glycerin, gum arabic, and sugar.

[0059] The obstruction element is preferably comprised of stearin. The obstruction element may comprise stearin in an amount of at least about 80 weight percent, or at least about 90 weight percent, on a dry weight basis.

[0060] The obstructing element may include both stearin and glycerin.

[0061] Stearin may be in powder form when the upstream elements are in their initial state.

[0062] The upstream element has a smaller draw resistance in its final state compared to its initial state. The change in the draw resistance of the upstream element based on the state transition from the initial to the final state may help eliminate the perception of a warm aerosol during initial inhalation and provide an acceptable aerosol at an appropriate temperature during subsequent inhalation. This may improve the user's sensory experience throughout the entire user experience.

[0063] The initial draw resistance of the upstream element may be such that the installation of the upstream element eliminates the user's perception of warm aerosols during initial inhalation. Increasing the draw resistance of the upstream element may reduce the amount of air drawn into the aerosol-generating article through the upstream element. This may reduce the amount of aerosol delivered to the user. Reducing the amount of aerosol delivered to the user during initial inhalation may help eliminate the perception of warm aerosols.

[0064] The final state of the upstream element's draw resistance may be such that the aerosol generating article provides the user with the desired sensory experience for most of the user experience, after the user has inhaled a few initial puffs. For example, the final state of the upstream element's draw resistance may be such that the force required to draw air through the aerosol generating article is desirable, and furthermore, that the aerosol delivered to the user is at a desirable temperature and has a desirable composition.

[0065] The draw resistance of the upstream element may vary depending on the overall configuration of the aerosol generating article.

[0066] The draw resistance of the upstream element in its final state may be at least approximately 20 percent, at least approximately 40 percent, or at least approximately 60 percent lower than the draw resistance of the upstream element in its initial state. In some examples, the draw resistance of the upstream element in its final state may be at least approximately 90 percent lower than the draw resistance of the upstream element in its initial state.

[0067] The draw resistance of the upstream element in the final state may be smaller than the draw resistance of the upstream element in the initial state by approximately 95 percent or less, approximately 90 percent or less, or approximately 85 percent or less.

[0068] The draw resistance of the upstream element in the final state may be approximately 20 to 95 percent, 20 to 90 percent, or 20 to 85 percent smaller than the draw resistance of the upstream element in the initial state.

[0069] The draw resistance of the upstream element in the final state may be smaller by approximately 40 to 95 percent, 40 to 90 percent, or 40 to 85 percent compared to the draw resistance of the upstream element in the initial state.

[0070] The draw resistance of the upstream element in the final state may be smaller by approximately 60 to 95 percent, 60 to 90 percent, or 60 to 85 percent compared to the draw resistance of the upstream element in the initial state.

[0071] In some examples, the draw resistance of the upstream element in the final state may be approximately 90 to 95 percent lower than the draw resistance of the upstream element in the initial state.

[0072] The draw resistance of the upstream element in its final state may be smaller than the draw resistance of the upstream element in its initial state by at least approximately 5 milliH2O, at least approximately 15 milliH2O, or at least approximately 25 milliH2O. In some examples, the draw resistance of the upstream element in its final state may be smaller than the draw resistance of the upstream element in its final state by at least approximately 90 milliH2O.

[0073] The draw resistance of the upstream element in its final state may be smaller than that of the upstream element in its initial state by approximately 200 mmH2O or less. The draw resistance of the upstream element in its final state may be smaller than that of the upstream element in its initial state by approximately 90 mmH2O or less, approximately 75 mmH2O or less, or approximately 60 mmH2O or less.

[0074] The final state of the upstream element's draw resistance may be smaller than the initial state of the upstream element's draw resistance by approximately 5 mmH2O to 200 mmH2O, approximately 5 mmH2O to 90 mmH2O, approximately 5 mmH2O to 75 mmH2O, or approximately 5 mmH2O to 60 mmH2O.

[0075] The final state of the upstream element's draw resistance may be smaller than the initial state of the upstream element's draw resistance by approximately 15 mmH2O to 200 mmH2O, approximately 15 mmH2O to 90 mmH2O, approximately 15 mmH2O to 75 mmH2O, or approximately 15 mmH2O to 60 mmH2O.

[0076] The final state of the upstream element's draw resistance may be smaller than the initial state of the upstream element's draw resistance by approximately 25 mmH2O to 200 mmH2O, approximately 25 mmH2O to 90 mmH2O, approximately 25 mmH2O to 75 mmH2O, or approximately 25 mmH2O to 60 mmH2O.

[0077] In some examples, the draw resistance of the upstream element in the final state may be smaller by approximately 90 mmH2O to 200 mmH2O compared to the draw resistance of the upstream element in the initial state.

[0078] The initial draw resistance of the upstream element may be at least about 15 milliH2O, at least about 25 milliH2O, or at least 35 milliH2O. In some examples, the initial draw resistance of the upstream element may be at least about 100 milliH2O.

[0079] The initial draw resistance of the upstream element may be approximately 200 mmH2O or less. The initial draw resistance of the upstream element may be approximately 100 mmH2O or less, approximately 85 mmH2O or less, or approximately 70 mmH2O or less.

[0080] The final state of the upstream element's draw resistance may be at least about 2 milliH2O, at least about 5 milliH2O, or at least about 10 milliH2O.

[0081] The final state of the upstream element's draw resistance may be approximately 25 mmH2O or less, approximately 20 mmH2O or less, or approximately 15 mmH2O or less.

[0082] As the extraction resistance of the upstream element decreases based on the state change from the initial state to the final state, the overall extraction resistance of the aerosol-generating article may also decrease.

[0083] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be smaller than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state.

[0084] The overall draw resistance of the aerosol-generating article, based on the state change of the upstream elements from the initial state to the final state, may help eliminate the perception of warm aerosols during the initial inhalation and provide an acceptable aerosol at an appropriate temperature during subsequent inhalation. This may improve the user's sensory experience throughout the entire user experience.

[0085] In some examples, the pull-out resistance of the aerosol-generating article when the upstream element is in its initial state may be relatively large. In some examples, the difference in the pull-out resistance of the aerosol-generating article between when the upstream element is in its initial state and when the upstream element is in its final state may be relatively large. These examples may be, for example, when the obstruction element has a relatively large cross-sectional area, or when the upstream element comprises multiple obstruction elements and the total cross-sectional area of ​​the multiple cross-sectional elements is relatively large. In these examples, the obstruction element may be provided as a covering or layer on the end face of the upstream plug of the upstream element.

[0086] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be at least about 5 percent, at least about 10 percent, or at least about 15 percent lower than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state. In some examples, the overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be at least about 30 percent lower than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state.

[0087] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be less than or equal to approximately 80 percent, 60 percent, or 40 percent compared to the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state.

[0088] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be approximately 5 to 80 percent, 5 to 60 percent, or 5 to 40 percent lower than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state.

[0089] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be approximately 10 to 80 percent, 10 to 60 percent, or 10 to 40 percent lower than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state.

[0090] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be approximately 15 to 80 percent, 15 to 60 percent, or 15 to 40 percent lower than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state.

[0091] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be approximately 30 to 80 percent, 30 to 60 percent, or 30 to 40 percent lower than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state.

[0092] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be less by at least approximately 5 mmH2O, at least approximately 8 mmH2O, or at least approximately 12 mmH2O compared to the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state. In some examples, the overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be less by at least approximately 50 mmH2O compared to the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state.

[0093] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be less than or equal to approximately 120 mmH2O compared to the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state. The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be less than or equal to approximately 40 mmH2O, less than or equal to approximately 30 mmH2O, or less than or equal to approximately 20 mmH2O compared to the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state.

[0094] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be smaller than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state by approximately 5 mmH2O to 120 mmH2O, approximately 5 mmH2O to 40 mmH2O, approximately 5 mmH2O to 30 mmH2O, and approximately 5 mmH2O to 20 mmH2O.

[0095] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be smaller than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state by approximately 8 mmH2O to 120 mmH2O, approximately 8 mmH2O to 40 mmH2O, approximately 8 mmH2O to 30 mmH2O, and approximately 8 mmH2O to 20 mmH2O.

[0096] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be smaller than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state by approximately 12 mmH2O to 120 mmH2O, approximately 12 mmH2O to 40 mmH2O, approximately 12 mmH2O to 30 mmH2O, and approximately 12 mmH2O to 20 mmH2O.

[0097] In some examples, the overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be approximately 50 mmH2O to 120 mmH2O less than the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state.

[0098] The overall draw resistance of the aerosol-generating article when the upstream element is in its initial state may be at least about 40 mmH2O, at least about 45 mmH2O, or at least about 50 mmH2O. In some examples, the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state may be at least about 100 mmH2O.

[0099] The overall draw resistance of the aerosol-generating article when the upstream element is in its initial state may be approximately 200 mmH2O or less. The overall draw resistance of the aerosol-generating article when the upstream element is in its initial state may be approximately 100 mmH2O or less, approximately 85 mmH2O or less, or approximately 70 mmH2O or less.

[0100] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be at least about 25 mmH2O, at least about 30 mmH2O, or at least about 35 mmH2O.

[0101] The overall draw resistance of the aerosol-generating article when the upstream element is in its final state may be approximately 80 mmH2O or less, approximately 70 mmH2O or less, or approximately 60 mmH2O or less.

[0102] As will be further explained below, the aerosol-generating article may include a downstream section located downstream of the aerosol-generating substrate. The downstream section may include a ventilation zone.

[0103] The ventilation level of the aerosol-generating article when the upstream element is in its final state may be lower than the ventilation level of the aerosol-generating article when the upstream element is in its initial state.

[0104] When used herein in connection with this disclosure, the term “ventilation level” is used to indicate the volume ratio of the airflow flowing into the aerosol-generating article through the ventilation zone (ventilation airflow) to the sum of the aerosol airflow and the ventilation airflow. A higher ventilation level results in greater dilution of the aerosol flow delivered to the user. Increasing the ventilation level may increase the cooling level of the aerosol flow before delivery to the user.

[0105] When an upstream element changes state from its initial state to its final state during the user experience, the change in the ventilation level of the aerosol-generating article may help to eliminate the user's initial perception of a warm aerosol during inhalation and to provide an aerosol of an appropriate temperature that is acceptable during subsequent inhalation.

[0106] A larger difference in the withdrawal resistance of the upstream element or aerosol-generating article between when the upstream element is in its initial state and when it is in its final state may result in a larger difference in the aerosol-generating article's ventilation level between when the upstream element is in its initial state and when it is in its final state.

[0107] In some examples, the ventilation level of the aerosol-generating article when the upstream element is in its initial state may be relatively high. In some examples, the difference in the ventilation level of the aerosol-generating article between when the upstream element is in its initial state and when the upstream element is in its final state may be relatively large. These examples may be, for example, when the obstruction element has a relatively large cross-sectional area, or when the upstream element comprises multiple obstruction elements and the total cross-sectional area of ​​the multiple cross-sectional elements is relatively large. In these examples, the obstruction element may be provided as a covering on the end face of the upstream plug of the upstream element.

[0108] The ventilation of the aerosol-generating article when the upstream element is in its final state may be at least approximately 4 percentage points, at least approximately 6 percentage points, or at least approximately 8 percentage points lower than the ventilation level of the aerosol-generating article when the upstream element is in its initial state. In some examples, the ventilation of the aerosol-generating article when the upstream element is in its final state may be at least approximately 30 percentage points lower than the ventilation level of the aerosol-generating article when the upstream element is in its initial state.

[0109] The ventilation level of the aerosol-generating article when the upstream element is in its final state may be less than or equal to approximately 60 percent points compared to the ventilation level of the aerosol-generating article when the upstream element is in its initial state. The ventilation level of the aerosol-generating article when the upstream element is in its final state may be less than or equal to approximately 25 percent points, less than or equal to approximately 20 percent points, or less than or equal to approximately 15 percent points compared to the ventilation level of the aerosol-generating article when the upstream element is in its initial state.

[0110] The ventilation level of the aerosol-generating article when the upstream element is in its final state may be approximately 4 to 60 percent points, 4 to 25 percent points, 4 to 20 percent points, or 4 to 15 percent points lower than the ventilation level of the aerosol-generating article when the upstream element is in its initial state.

[0111] The ventilation level of the aerosol-generating article when the upstream element is in its final state may be approximately 6 to 60 percent points, 6 to 25 percent points, 6 to 20 percent points, or 6 to 15 percent points lower than the ventilation level of the aerosol-generating article when the upstream element is in its initial state.

[0112] The ventilation level of the aerosol-generating article when the upstream element is in its final state may be approximately 8 to 60 percent points, 8 to 25 percent points, 8 to 20 percent points, or 8 to 15 percent points lower than the ventilation level of the aerosol-generating article when the upstream element is in its initial state.

[0113] In some examples, the ventilation level of the aerosol-generating article when the upstream element is in its final state may be approximately 30 to 60 percentage points lower than the ventilation level of the aerosol-generating article when the upstream element is in its initial state.

[0114] When the upstream element is in its initial state, the aerosol-generating article may have a ventilation level of at least about 30 percent, at least about 35 percent, or at least about 40 percent. In some examples, when the upstream element is in its initial state, the aerosol-generating article may have a ventilation level of at least about 60 percent.

[0115] When the upstream elements are in their initial state, the aerosol-generating article may have a ventilation level of approximately 80 percent or less, approximately 70 percent or less, or approximately 60 percent or less.

[0116] When the upstream element is in its initial state, the aerosol-generating article may have a ventilation level of approximately 30 percent to 80 percent, approximately 30 percent to 70 percent, or approximately 30 percent to 60 percent.

[0117] When the upstream element is in its initial state, the aerosol-generating article may have a ventilation level of approximately 35 percent to 80 percent, approximately 35 percent to 70 percent, or approximately 35 percent to 60 percent.

[0118] When the upstream element is in its initial state, the aerosol-generating article may have a ventilation level of approximately 40 percent to 80 percent, approximately 40 percent to 70 percent, or approximately 40 percent to 60 percent.

[0119] In some examples, when the upstream element is in its initial state, the aerosol-generating article may have a ventilation level of about 60 percent to about 80 percent, or about 60 percent to about 70 percent.

[0120] When the upstream element is in its initial state, the obstruction element may substantially block the airflow through the upstream element. In this case, when the upstream element is in its initial state, the aerosol generating article may have a ventilation level of approximately 100 percent. In other words, substantially all air introduced into the aerosol generating article may be drawn into the aerosol generating article through the ventilation zone.

[0121] When the upstream element is in its final state, the aerosol-generating article may have a ventilation level of at least about 15 percent, at least about 20 percent, or at least about 25 percent.

[0122] When the upstream element is in its final state, the aerosol-generating article may have a ventilation level of approximately 60 percent or less, approximately 55 percent or less, or approximately 50 percent or less.

[0123] When the upstream element is in its final state, the aerosol-generating article may have a ventilation level of approximately 15 percent to 60 percent, approximately 15 percent to 55 percent, or approximately 15 percent to 50 percent.

[0124] When the upstream element is in its final state, the aerosol-generating article may have a ventilation level of approximately 20 percent to 60 percent, or approximately 20 percent to 55 percent, or approximately 20 percent to 50 percent.

[0125] When the upstream element is in its final state, the aerosol-generating article may have a ventilation level of approximately 25 percent to 65 percent, or approximately 25 percent to 55 percent, or approximately 25 percent to 50 percent.

[0126] For example, when the upstream element is in its final state, the aerosol-generating article may have a ventilation level of approximately 50 percent.

[0127] When the upstream element is in its initial state, the obstruction element may substantially block airflow through the longitudinal channel by being at least partially located within the longitudinal airflow channel. When the upstream element is in its initial state, the obstruction element may be entirely located within the longitudinal airflow channel.

[0128] When the upstream element is in its initial state, the obstruction element may be located at the upstream end of the upstream element. When the upstream element is in its initial state, the obstruction element may extend from the upstream end of the upstream element toward the downstream end of the upstream element. The obstruction element located at the upstream end of the upstream element may act as a visual indicator for the user of the upstream end of the aerosol generating article. When the upstream element changes state from the initial state to the final state, the obstruction element may move so that the configuration and position of the obstruction element in the final state can indicate to the user that the aerosol generating article has been used.

[0129] When the upstream element is in its initial state, the obstruction element may be located at the downstream end of the upstream element. When the upstream element is in its initial state, the obstruction element may extend from the downstream end of the upstream element toward the upstream end of the upstream element. When the aerosol generating article is in use, the aerosol generating article may be oriented so that its upstream end is located vertically downward relative to its downstream end. When the upstream element is in its initial state, the obstruction element being located at the downstream end of the upstream element may mean that when the aerosol generating article is heated during use and the state of the upstream element changes from the initial state to the final state, the obstruction element will flow out toward the upstream end of the aerosol generating article and separate from the aerosol generating substrate. When the state of the upstream element changes, the obstruction element may be absorbed by another component of the upstream element, such as an upstream plug of the upstream element.

[0130] When the upstream element is in its initial state, the obstruction element may extend from the upstream end of the upstream element to the downstream end of the upstream element. This may simplify the manufacturing of the upstream element, as it may be possible to manufacture multiple upstream elements from a single continuous rod. The obstruction element extending from the upstream end of the upstream element to the downstream end of the upstream element may simplify the assembly of the aerosol generating article, as the orientation in which the upstream element is assembled within the aerosol generating article may be irrelevant.

[0131] When the upstream element is in its initial state, the obstruction element may substantially prevent airflow from passing through the longitudinal airflow channel by covering it. For example, the obstruction element may be provided as an obstruction layer at the upstream end of the upstream element, such as an obstruction layer on the upstream end face of the upstream plug of the upstream element. Alternatively, the obstruction element may be provided as an obstruction layer at the downstream end of the upstream element, such as an obstruction layer on the downstream end face of the upstream plug of the upstream element.

[0132] If the upstream element has one or more longitudinal airflow channels extending through the upstream plug of the upstream element, then when the upstream element is in its initial state, each of the one or more longitudinal airflow channels may be blocked by the obstruction layer provided as an obstruction layer on the end face of the upstream element.

[0133] If the obstruction element is in the form of an obstruction layer at the end of the upstream element, the obstruction element may be a covering at the end of the upstream element. For example, the obstruction element may be provided as a covering on the end face of the upstream plug of the upstream element. The obstruction element may be sprayed onto the end face of the upstream plug of the upstream element.

[0134] When the upstream element is in its initial state, the obstruction element may be completely embedded inside another component of the upstream element, such as the upstream plug of the upstream element. This may help ensure that the obstruction element is contained within the upstream element when the upstream element is in its initial state, and when the upstream element changes state from the initial state to the final state, or both. This may be particularly advantageous when the obstruction element is in the form of a powder when the upstream element is in its initial state.

[0135] The airflow channel in the longitudinal direction preferably has a substantially circular cross-sectional shape. The airflow channel in the longitudinal direction may also be substantially cylindrical.

[0136] The size of the longitudinal airflow channel may be selected based on the desired draw resistance of the upstream element in its initial state and the desired draw resistance of the upstream element in its final state. Increasing the size of the longitudinal airflow channel may increase the decrease in the draw resistance of the upstream element based on the state change from the initial to the final state. This is because, when the upstream element is in its final state, the longitudinal airflow channel may provide a path that is not substantially obstructed for air to flow through. Increasing the size of the substantially unobstructed path of the upstream element may reduce the draw resistance of the upstream element.

[0137] The airflow channel in the longitudinal direction may have a width of at least about 0.5 mm, at least about 0.7 mm, or at least about 1 mm.

[0138] The airflow channel in the longitudinal direction may have a width of approximately 3 mm or less, approximately 2.5 mm or less, or approximately 2 mm or less.

[0139] The airflow channel in the longitudinal direction may have a width of approximately 0.5 mm to approximately 3 mm, approximately 0.5 mm to approximately 2.5 mm, or approximately 0.5 mm to approximately 2 mm.

[0140] The airflow channel in the longitudinal direction may have a width of approximately 0.7 mm to approximately 3 mm, approximately 0.7 mm to approximately 2.5 mm, or approximately 0.7 mm to approximately 2 mm.

[0141] The airflow channel in the longitudinal direction may have a width of approximately 1 mm to 3 mm, approximately 1 mm to 2.5 mm, or approximately 1 mm to 2 mm.

[0142] The longitudinal airflow channel may extend substantially along the entire length of the upstream element. The longitudinal airflow channel may extend substantially from the upstream end of the upstream element to the downstream end of the upstream element. For example, the longitudinal airflow channel may extend along the entire length of the upstream plug of the upstream element. When the longitudinal airflow channel extends substantially along the entire length of the upstream element, the reduction in the draw resistance of the upstream element from the initial state to the final state may be greater than the reduction in the upstream element when the longitudinal airflow channel does not extend substantially along the entire length of the upstream element. This is because when the longitudinal airflow channel extends substantially along the entire length of the upstream element, the final-state upstream element may have a substantially unobstructed longitudinal airflow channel that extends substantially along the entire length of the upstream element, and such an airflow channel provides a path with less resistance to air flowing through it.

[0143] The airflow channel in the longitudinal direction does not need to extend along the entire length of the upstream element.

[0144] The airflow channel in the longitudinal direction may extend along at least about 20 percent of the length of the upstream element, along at least about 50 percent of the length of the upstream element, or along at least about 80 percent of the length of the upstream element.

[0145] The longitudinal airflow channel may extend up to the entire length of the upstream element. For example, the longitudinal airflow channel may extend up to about 90 percent of the length of the upstream element, or up to about 80 percent of the length of the upstream element.

[0146] The airflow channel in the longitudinal direction may extend along approximately 20 percent to 100 percent of the length of the upstream element, along approximately 50 percent to 100 percent of the length of the upstream element, or along approximately 80 percent to 100 percent of the length of the upstream element.

[0147] The airflow channel in the longitudinal direction may extend along approximately 20 percent to 90 percent of the length of the upstream element, along approximately 50 percent to 90 percent of the length of the upstream element, or along approximately 80 percent to 90 percent of the length of the upstream element.

[0148] The airflow channel in the longitudinal direction may extend along approximately 20 percent to 80 percent of the length of the upstream element, or along approximately 50 percent to 80 percent of the length of the upstream element.

[0149] The airflow channel in the longitudinal direction may have a length of at least about 1 millimeter, at least about 2.5 millimeters, or at least about 4 millimeters. The airflow channel in the longitudinal direction may have a length of about 10 millimeters or less, about 8 millimeters or less, or about 6 millimeters or less. For example, the airflow channel in the longitudinal direction may have a length of about 5 millimeters.

[0150] The width, cross-sectional area, length, size, and shape of the longitudinal airflow channel discussed herein may refer to the width, cross-sectional area, length, size, and shape of the longitudinal airflow channel when the upstream element is in either the initial state or the final state, or both.

[0151] The width, cross-sectional area, length, size, and shape of the airflow channel in the longitudinal direction may remain constant as the upstream element changes state from the initial state to the final state.

[0152] The upstream element may comprise a single longitudinal airflow channel. The width, cross-sectional area, length, size, and shape of the longitudinal airflow channel described herein may apply to a single longitudinal airflow channel.

[0153] The obstructing element may substantially fill the volume of the airflow channel in the longitudinal direction.

[0154] The size and shape of the obstruction element may be substantially identical to the size and shape of the airflow channel in the longitudinal direction. This may be the case in particular when the obstruction element is substantially entirely located inside the airflow channel in the longitudinal direction when the upstream element is in its initial state. The size and shape of the obstruction element being substantially identical to the size and shape of the airflow channel in the longitudinal direction may substantially prevent airflow from flowing through the airflow channel in the longitudinal direction when the upstream element is in its initial state by blocking the airflow channel with the obstruction element.

[0155] The obstruction element may have a substantially circular cross-sectional shape. The obstruction element may also have a substantially cylindrical shape.

[0156] The obstruction element may have substantially the same width as the width of the airflow channel in the longitudinal direction.

[0157] The obstruction element may have a width of at least about 0.5 millimeters, at least about 0.7 millimeters, or at least about 1 millimeter.

[0158] The obstruction element may have a width of approximately 3 mm or less, approximately 2.5 mm or less, or approximately 2 mm or less.

[0159] The obstruction element may have a width of approximately 0.5 mm to approximately 3 mm, approximately 0.5 mm to approximately 2.5 mm, or approximately 0.5 mm to approximately 2 mm.

[0160] The obstruction element may have a width of approximately 0.7 mm to approximately 3 mm, approximately 0.7 mm to approximately 2.5 mm, or approximately 0.7 mm to approximately 2 mm.

[0161] The obstruction element may have a width of approximately 1 mm to 3 mm, approximately 1 mm to 2.5 mm, or approximately 1 mm to 2 mm.

[0162] The obstruction element may have substantially the same cross-sectional shape as the airflow channel in the longitudinal direction. The obstruction element may have substantially the same cross-sectional area as the airflow channel in the longitudinal direction.

[0163] The obstruction element may have substantially the same cross-sectional area and cross-sectional shape as the airflow channel in the longitudinal direction. This may substantially prevent airflow from passing through the airflow channel in the longitudinal direction by blocking the airflow channel in the longitudinal direction.

[0164] The obstruction element may have a larger cross-sectional area compared to the cross-sectional area of ​​the longitudinal airflow channel. This may be particularly true when the obstruction element is positioned at the end of the longitudinal airflow channel, for example, as a covering at the upstream end face of the upstream plug of an upstream element having a longitudinal airflow channel extending through its interior. The obstruction element may have a shape and cross-sectional area such that the obstruction element completely covers the end of the longitudinal airflow channel, thereby substantially preventing airflow through the longitudinal channel.

[0165] The obstruction element may have substantially the same cross-sectional area and cross-sectional shape as the end of the upstream plug of the upstream element, which has a longitudinal airflow channel extending through its interior. If the upstream element includes an upstream plug, the obstruction element may be located on the end face of the upstream plug, and the obstruction element may have substantially the same cross-sectional area and cross-sectional shape as the end face of the upstream plug.

[0166] The obstruction element may have a length substantially equal to the length of the airflow channel in the longitudinal direction. The obstruction element may have a length shorter than the length of the airflow channel in the longitudinal direction.

[0167] The obstruction element may extend substantially along the entire length of the upstream element. The obstruction element may extend substantially from the upstream end of the upstream element to the downstream end of the upstream element. For example, the obstruction element may extend along the entire length of the upstream plug of the upstream element. When the obstruction element extends substantially along the entire length of the upstream element, the reduction in the draw resistance of the upstream element from the initial state to the final state may be greater than the reduction in the upstream element when the obstruction element does not extend substantially along the entire length of the upstream element. This is because, when the obstruction element extends substantially along the entire length of the upstream element, the final-state upstream element may have a substantially unobstructed longitudinal airflow channel that extends substantially along the entire length of the upstream element, and such an airflow channel provides a path with less resistance to air flowing through it.

[0168] The fault element does not need to extend along the entire length of the upstream element.

[0169] The obstruction element may extend along at least about 20 percent of the length of the upstream element, along at least about 50 percent of the length of the upstream element, or along at least about 80 percent of the length of the upstream element.

[0170] The obstruction element may extend up to the entire length of the upstream element. For example, the obstruction element may extend up to about 90 percent of the length of the upstream element, or up to about 80 percent of the length of the upstream element.

[0171] The obstruction element may extend along approximately 20 percent to 100 percent of the length of the upstream element, along approximately 50 percent to 100 percent of the length of the upstream element, or along approximately 80 percent to 100 percent of the length of the upstream element.

[0172] The obstruction element may extend along approximately 20 percent to 90 percent of the length of the upstream element, along approximately 50 percent to 90 percent of the length of the upstream element, or along approximately 80 percent to 90 percent of the length of the upstream element.

[0173] The obstruction element may extend along approximately 20 percent to 80 percent of the length of the upstream element, or along approximately 50 percent to 80 percent of the length of the upstream element.

[0174] The fault element may have a length of at least about 1 millimeter, at least about 2.5 millimeters, or at least about 4 millimeters. The fault element may have a length of about 10 millimeters or less, about 8 millimeters or less, or about 6 millimeters or less. For example, the fault element may have a length of about 5 millimeters.

[0175] If the obstruction element is in the form of a powder, the width, cross-sectional area, length, size, and shape of the obstruction element may refer to the width, cross-sectional area, length, size, and shape, respectively, of the volume occupied by the powder.

[0176] In this specification, the width, cross-sectional area, length, size, and shape of the obstruction elements refer to the width, cross-sectional area, length, and shape of the obstruction element when the upstream element is in its initial state, unless otherwise specified.

[0177] The upstream element may have multiple airflow channels in the longitudinal direction. The characteristics of the longitudinal airflow channels described above may be applicable to each of the multiple longitudinal airflow channels.

[0178] The upstream element may have multiple fault elements. The characteristics of the fault elements described above may be applicable to each of the multiple fault elements.

[0179] The upstream element may comprise multiple longitudinal airflow channels and multiple corresponding obstruction elements. For example, the upstream element may comprise three longitudinal airflow channels and three corresponding obstruction elements.

[0180] When the upstream element is in its initial state, each of the multiple longitudinal airflow channels may be blocked by a corresponding obstruction element, thereby substantially preventing airflow from passing through each of the multiple longitudinal airflow channels.

[0181] When the upstream element is in its final state, each of the multiple longitudinal airflow channels may be opened at least partially so that airflow can flow through the longitudinal airflow channels.

[0182] The upstream element may include an upstream plug. The airflow channel in the longitudinal direction of the upstream element may be defined inside the upstream plug. The airflow channel in the longitudinal direction of the upstream element may extend through the upstream plug. The airflow channel in the longitudinal direction of the upstream element may extend from the upstream end of the upstream plug to the downstream end of the upstream plug.

[0183] The upstream plug of the upstream element may be formed from one or more of the following: paper-based materials such as paper and cardboard, polymer materials such as polylactic acid, and any other cellulosic materials such as cellulose acetate.

[0184] The upstream plug of the upstream element may be a plug made of cellulose acetate tow.

[0185] The upstream element may have a length of at least about 2 millimeters, at least about 3 millimeters, or at least about 4 millimeters. The upstream element may have a length of about 10 millimeters or less, about 8 millimeters or less, or about 6 millimeters or less. For example, the upstream element may have a length of about 5 millimeters.

[0186] The length of the upstream element may be selected based on the desired RTD of the upstream element in either the initial state or the final state, or both. The length of the upstream element may also be selected based on the desired overall length of the aerosol-generating article.

[0187] The upstream element may have a substantially circular cross-sectional shape.

[0188] The upstream element may have an outer diameter of at least about 5 mm, about 6 mm, or about 7 mm. The upstream element may have an outer diameter of 12 mm or less, about 10 mm or less, or about 8 mm or less. For example, the upstream element may have an outer diameter of about 7.3 mm.

[0189] The upstream element may have substantially the same outer diameter as the aerosol generating substrate. The upstream element may have substantially the same outer diameter as the aerosol generating article.

[0190] The upstream element is located upstream of the aerosol generating substrate. The upstream element may be in contact with the aerosol generating substrate. The upstream element may be located at the upstream end of the aerosol generating article.

[0191] The aerosol-generating article may include one or more additional members located upstream of the upstream element.

[0192] The aerosol generating substrate may be in the form of a rod. As used herein in connection with this disclosure, the term “rod” is used to refer to an overall cylindrical element having a substantially circular, oval, or elliptical cross-section.

[0193] The aerosol generating substrate may comprise an aerosol generating material surrounded by a wrapper, such as an upstream plug wrap. For example, the aerosol generating substrate may comprise an aerosol generating material surrounded by a wrapper to form a rod.

[0194] The aerosol generating substrate may have a length of at least about 8 millimeters, at least about 9 millimeters, or at least about 10 millimeters. The aerosol generating substrate may have a length of about 16 millimeters or less, about 15 millimeters or less, or about 14 millimeters or less. For example, the aerosol generating substrate may have a length of about 12 millimeters.

[0195] The aerosol generating substrate may have a substantially circular cross-sectional shape.

[0196] The aerosol generating substrate may have an outer diameter of at least about 5 mm, at least about 6 mm, or at least about 7 mm. The aerosol generating substrate may have an outer diameter of 12 mm or less, about 10 mm or less, or about 8 mm or less. For example, the aerosol generating substrate may have an outer diameter of about 7.3 mm.

[0197] The RTD of the aerosol generating substrate may be at least about 4 mmH2O, at least 5 mmH2O, or at least 6 mmH2O. The RTD of the aerosol generating substrate may be about 10 mmH2O or less, about 9 mmH2O or less, or about 8 mmH2O or less.

[0198] The aerosol generating substrate may be a solid aerosol generating substrate.

[0199] The aerosol generating substrate may include an aerosol forming body.

[0200] The aerosol-forming body may be any suitable known compound or mixture of compounds that promotes the formation of a dense and stable aerosol during use. For example, suitable aerosol-forming bodies include polyhydric alcohols such as triethylene glycol, 1,3-butanediol, propylene glycol, and glycerin; esters of polyhydric alcohols such as glycerol mono-, di-, or triacetate; aliphatic esters of mono-, di-, or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate; and combinations thereof. The aerosol-forming body preferably comprises one or more of glycerin and propylene glycol. The aerosol-forming body may consist of glycerin, or propylene glycol, or a combination of glycerin and propylene glycol.

[0201] The aerosol generating substrate may comprise at least about 5 weight percent, at least about 10 weight percent, or at least about 12 weight percent of aerosol forming material, based on the dry weight of the aerosol generating substrate. The aerosol generating substrate may comprise at least 30 weight percent, at least about 25 weight percent, or at least about 20 weight percent of aerosol forming material, based on the dry weight of the aerosol generating substrate.

[0202] The aerosol generating substrate may comprise multiple pieces of tobacco material. As used herein in connection with this disclosure, the term “piece” refers to an element having a length substantially greater than its width and thickness.

[0203] The aerosol generating substrate may comprise pellets or granules of multiple tobacco materials.

[0204] The aerosol generating substrate may comprise one or more sheets of tobacco material. The one or more sheets of tobacco material may be subjected to one or more processes such as crimping, folding, bundling, and pleating.

[0205] The tobacco material may be homogenized tobacco material. As used herein in connection with this disclosure, the term “homogenized tobacco material” is used to describe a material formed by aggregating particulate tobacco material.

[0206] The aerosol-generating article may include a susceptor. As used herein in relation to the present invention, the term "susceptor" refers to a material capable of converting electromagnetic energy into heat. When located in a fluctuating electromagnetic field, eddy currents induced within the susceptor heat the susceptor.

[0207] The susceptor is disposed in thermal contact with the aerosol generating substrate. Therefore, when the susceptor is heated, the aerosol generating substrate is heated by the susceptor, causing aerosol generation. The susceptor may also be disposed in direct physical contact with the aerosol generating substrate.

[0208] The susceptor may be disposed inside the aerosol generating substrate.

[0209] The susceptor may be formed from any material that can be inductively heated to a temperature sufficient to generate an aerosol from the aerosol-generating substrate. For example, the susceptor may comprise a metal or carbon. The susceptor may comprise or be made of a ferromagnetic material, such as a ferromagnetic alloy, ferrite iron, or ferromagnetic steel or ferromagnetic stainless steel. A preferred susceptor may be aluminum, or comprise aluminum.

[0210] The aerosol generating article may include a downstream section located downstream of the aerosol generating substrate. The downstream section may be located immediately downstream of the aerosol generating substrate. The downstream section may extend between the aerosol generating substrate and the downstream end of the aerosol generating article.

[0211] The aerosol-generating article may include one or more components located downstream of the aerosol-generating substrate. If present, the one or more components located downstream of the aerosol-generating substrate form the downstream section of the aerosol-generating article.

[0212] One or more elements may be in a relationship where their ends touch each other.

[0213] The length of the downstream section may be at least 20 millimeters, or at least 25 millimeters, or at least 30 millimeters. The length of the downstream section may be less than 70 millimeters, or less than 60 millimeters, or less than 50 millimeters.

[0214] The aerosol generating article may include a mouthpiece element located downstream of the aerosol generating substrate. The aerosol generating article may also include a downstream section with a mouthpiece element. The mouthpiece element may be located at the downstream end of the aerosol generating article.

[0215] The mouthpiece element may also be a mouthpiece filter element. The mouthpiece element may comprise at least one filter segment for filtering aerosols generated when the aerosol generating substrate is heated. For example, the mouthpiece element may comprise one or more segments of a fibrous filter material. Suitable fibrous filter materials are known in the art. For example, at least one mouthpiece filter segment may comprise a cellulose acetate filter segment formed from cellulose acetate tow.

[0216] Each of at least one filter segment may be a solid plug; that is, each of at least one filter segment may be non-tubular.

[0217] The mouthpiece element may consist of a single filter segment. The mouthpiece element may include two or more filter segments that are in contact with each other end-to-end and aligned axially.

[0218] The mouthpiece element may include a flavoring agent that can be provided in any suitable form. For example, the mouthpiece element may include one or more capsules, flavoring beads or granules, or one or more flavoring threads or filaments.

[0219] The parameters or characteristics described herein in relation to the entire mouthpiece element may be equally applicable to the filter segment of the mouthpiece element.

[0220] The mouthpiece element may have at least about 10 mmH2O of RTD. The mouthpiece element may have RTD of about 25 mmH2O or less, about 20 mmH2O or less, or about 15 mmH2O or less.

[0221] The mouthpiece element may have a length of at least about 3 millimeters, or at least about 5 millimeters. The length of the mouthpiece element may be about 11 millimeters or less, or about 9 millimeters or less. For example, the mouthpiece element may have a length of about 7 millimeters.

[0222] The mouthpiece element may have a substantially circular cross-sectional shape.

[0223] The mouthpiece element may have substantially the same outer diameter as the aerosol generating substrate. The mouthpiece element may have substantially the same outer diameter as the aerosol generating article.

[0224] The mouthpiece element may be surrounded by an upstream plug wrap.

[0225] The mouthpiece element does not need to be ventilated so that air does not enter the aerosol-generating article along the mouthpiece element.

[0226] The mouthpiece element may be connected to one or more adjacent components of the aerosol-generating article by a chipping wrapper.

[0227] The aerosol generating article may have a mouth-end cavity at its downstream end. The aerosol generating article may also have a downstream section with a mouth-end cavity.

[0228] If present, the oral cavity may be located downstream of the mouthpiece element.

[0229] The mouth-end cavity may be defined by a hollow tubular element provided at the downstream end of the mouthpiece. Alternatively, the mouth-end cavity may be defined by an outer wrapper of the mouthpiece element, which extends downstream from the mouthpiece element.

[0230] The aerosol generating article may have one or more intermediate elements between the aerosol generating substrate and the mouthpiece element. The one or more intermediate elements may be in contact with each other at their ends.

[0231] One of the intermediate elements may abut the downstream end of the aerosol generating substrate. One of the intermediate elements may abut the upstream end of the mouthpiece element. For example, if there is a single intermediate element, that single intermediate element may abut both the downstream end of the aerosol generating substrate and the upstream end of the mouthpiece element. For example, if there are multiple intermediate elements, one intermediate element may abut the downstream end of the aerosol generating substrate, and another intermediate element may abut the upstream end of the mouthpiece element.

[0232] At least one of the intermediate elements may be a tubular element.

[0233] The tubular element comprises a tubular body. The tubular body defining the cavity extends from its upstream end to its downstream end.

[0234] As used herein, the term “tubular element” is used to refer to an element that is generally cylindrical in shape and defines a lumen or airflow passage along its longitudinal axis. In particular, the term “tubular” is used below with respect to a tubular body having a substantially cylindrical cross-section and a tubular element that defines at least one airflow conduit establishing an uninterrupted fluid communication between the upstream end of the tubular body and the downstream end of the tubular body. However, it will be understood that alternative shapes (e.g., alternative cross-sectional shapes) of the tubular body may be possible.

[0235] In the context of this disclosure, the tubular body of a tubular element provides an unlimited flow channel. This means that the tubular body of a tubular element provides a negligible level of drawdown resistance (RTD). As used herein in connection with this disclosure, the term “negligible level of RTD” is used to describe an RTD of less than 1 mmH2O per 10 millimeters of length of the tubular body, less than 0.4 mmH2O per 10 millimeters of length of the tubular body, or less than 0.1 mmH2O per 10 millimeters of length of the tubular body. Therefore, the flow channel should not contain any components that would obstruct the flow of air in the longitudinal direction. Preferably, the flow channel is substantially empty. In such cases, the tubular body of the tubular element defines an empty cavity.

[0236] The tubular element may have a folded end portion that forms a first end wall at the first end of the tubular body, the first end wall defining an opening for airflow between the cavity of the tubular body and the outside of the tubular element. The first end of the tubular body may be the upstream end of the tubular body. The first end wall may be called the upstream end wall. The first end wall may be located at the upstream end of the tubular element.

[0237] The tubular element may have a folded end portion that forms a second end wall at the second end of the tubular body, the second end wall defining an opening for airflow between the cavity of the tubular body and the outside of the tubular element. The second end of the tubular body may be the downstream end of the tubular body. The second end wall may be called the downstream end wall. The second end wall may be located at the downstream end of the tubular element.

[0238] The tubular element does not necessarily have to have a folded end portion.

[0239] The tubular body of a tubular element may extend from the upstream end of the tubular element to the downstream end of the tubular element. That is, the tubular body may extend along the entire length of the tubular element.

[0240] One or more intermediate elements may have an overall length of at least about 10 millimeters, at least about 12 millimeters, or at least about 15 millimeters. One or more intermediate elements may have an overall length of about 30 millimeters or less, about 25 millimeters or less, or about 23 millimeters or less. For example, one or more intermediate elements may have an overall length of about 21 millimeters.

[0241] If an aerosol-generating article has a single intermediate element, the total length of one or more intermediate elements is the length of the single intermediate element. If an aerosol-generating article has multiple intermediate elements, the total length of one or more intermediate elements is the sum of the lengths of each of the multiple intermediate elements.

[0242] Each of the one or more intermediate elements may have a substantially circular cross-sectional shape.

[0243] Each of the one or more intermediate elements may have substantially the same outer diameter as the outer diameter of the aerosol generating substrate. Each of the one or more intermediate elements may have substantially the same outer diameter as the outer diameter of the aerosol generating article.

[0244] One or more intermediate elements may be formed from any suitable material or from a combination of materials. For example, at least one of the intermediate elements may be formed from one or more materials selected from the group consisting of cellulose acetate, paper-based materials such as paper or cardboard, and polymer materials such as low-density polyethylene (LDPE). Other suitable materials include polyhydroxyalkanoate (PHA) fibers.

[0245] The aerosol generating article may include a ventilation zone. The aerosol generating article may comprise a downstream section and a ventilation zone located along the downstream section. Satisfactory cooling of the aerosol flow generated when the aerosol generating substrate is heated and drawn out through one or more intermediate elements may be achieved by providing a ventilation zone located along the downstream section. The ventilation zone may provide particularly efficient cooling of the generated aerosol before delivery to the user. While we do not wish to be bound by any theory, the temperature reduction caused by the entry of cool outside air into the downstream section through the ventilation zone may have a favorable effect on the nucleation and growth of aerosol particles.

[0246] The aerosol generating article may include a tubular element located downstream of the aerosol generating substrate and a ventilation zone provided along the tubular element. The ventilation zone may include a plurality of perforations penetrating the tubular wall of the tubular element.

[0247] The ventilation zone may be located along one or more intermediate elements. The ventilation zone may be located along at least one of the one or more intermediate elements. If one or more intermediate elements are one or more tubular elements, the ventilation zone may be located along at least one of the one or more tubular elements. If one or more intermediate elements are one or more tubular elements, the ventilation zone may have multiple perforations penetrating at least one tubular wall of one or more tubular elements.

[0248] The ventilation zone may have at least one row of circumferential perforations. The ventilation zone may have two rows of circumferential perforations. Each row of circumferential perforations may have 8 to 30 perforations. For example, the perforations may be formed online during the manufacture of the aerosol-generating article.

[0249] The aerosol-generating article may have an overall length of at least about 35 mm, at least about 38 mm, at least about 40 mm, or at least about 42 mm. The aerosol-generating article may have an overall length of about 100 mm or less, about 70 mm or less, about 60 mm or less, or 50 mm or less. For example, the aerosol-generating article may have an overall length of about 45 mm.

[0250] The aerosol-generating article preferably has a substantially circular cross-section.

[0251] The aerosol-generating article may have an outer diameter of at least about 5 mm, at least about 6 mm, or at least about 7 mm. The aerosol-generating article may have an outer diameter of about 12 mm or less, about 10 mm or less, or about 8 mm or less. For example, the aerosol-generating article may have an outer diameter of about 7.3 mm.

[0252] A second aspect of the present disclosure provides an aerosol generating system comprising an aerosol generating article according to the first aspect of the present disclosure and an aerosol generating device configured to heat the aerosol generating substrate of the aerosol generating article, wherein the aerosol generating device comprises a housing defining a cavity configured to receive the aerosol generating article.

[0253] The upstream elements of an aerosol-generating article may be heated by the aerosol generator when the aerosol-generating article is in use. In particular, the obstruction elements of the upstream elements of an aerosol-generating article may be heated by the aerosol generator when the aerosol-generating article is in use.

[0254] It is preferable that the aerosol-generating article is indirectly heated by an aerosol generator. The aerosol generator is configured to heat the aerosol-generating substrate of the aerosol generator. When using an aerosol-generating article equipped with an aerosol generator, the aerosol-generating substrate of the aerosol generator is heated. The heat from the aerosol-generating substrate may be conducted to the upstream element, thereby causing the upstream element to change its state from an initial state to a final state, for example, when a faulty element melts.

[0255] The aerosol generator may be a handheld aerosol generator.

[0256] The aerosol generator may be an electrically operated aerosol generator. The aerosol generator may include a power supply and control electronics. The aerosol generator may include a battery and control electronics.

[0257] The aerosol generator may be configured to heat the aerosol generating substrate of the aerosol generating article from the outside. That is, the aerosol generator may be configured to heat the aerosol generating substrate of the aerosol generating article from the outside.

[0258] The aerosol generator may include a heating element, such as an external heating element. The heating element may be arranged around the periphery of the cavity. The heating element may be a resistance heating element, an induction heating element, or both.

[0259] The aerosol generator may be equipped with a mouthpiece. [Examples]

[0260] The following is a non-exclusive list of non-limiting embodiments. Any one or more features in these embodiments may be combined with any one or more features in other embodiments or other forms or aspects described herein.

[0261] Example 1: Aerosol generating article comprising an aerosol generating substrate and an upstream element located upstream of the aerosol generating substrate, the upstream element comprising a longitudinal airflow channel and an obstruction element for blocking the longitudinal airflow channel, wherein the upstream element is configured to change its state from an initial state in which, when the aerosol generating article is heated during use, the longitudinal airflow channel is blocked by the obstruction element, substantially preventing airflow from passing through the longitudinal airflow channel, to a final state in which the longitudinal airflow channel is at least partially opened, allowing airflow to pass through the longitudinal airflow channel. Example 2: The aerosol generating article according to Example 1, wherein the upstream element has a smaller draw resistance in the final state compared to the initial state. Example 3: The aerosol generating article according to Example 1 or 2, wherein the obstructing element has a lower viscosity when the upstream element is in its final state compared to when the upstream element is in its initial state. Example 4: The aerosol generating article according to any one of Examples 1 to 3, wherein the obstruction element is configured to melt when the upstream element changes state from an initial state to a final state. Example 5: The obstructing element is an aerosol-generating article according to any one of Examples 1 to 4, having a melting point of approximately 40 degrees Celsius to approximately 220 degrees Celsius. Example 6: The obstructing element is an aerosol generating article as described in any of Examples 1 to 5, which is in the form of compressed powder when the upstream element is in its initial state. Example 7: The obstructing element is an aerosol-generating article according to any one of Examples 1 to 6, comprising wax. Example 8: The aerosol-generating article according to any one of Examples 1 to 7, wherein the obstructing element comprises one or more of stearin, paraffin, glycerin, gum arabic, and sugar. Example 9: The aerosol generating article according to any of Examples 1 to 8, wherein the draw resistance of the upstream element in the final state is at least about 20 percent lower than the draw resistance of the upstream element in the initial state. Example 10: The aerosol generating article according to any of Examples 1 to 9, wherein the draw resistance of the upstream element in the final state is at least about 5 millimeters less than the draw resistance of the upstream element in the initial state, by the amount of H2O. Example 11: The aerosol generating article according to any of Examples 1 to 10, wherein the initial state of the upstream element draw resistance is at least about 15 mmH2O. Example 12: The aerosol generating article according to any of Examples 1 to 11, wherein the final state of the upstream element draw resistance is approximately 25 mmH2O or less. Example 13: The aerosol generating article according to any of Examples 1 to 12, wherein the overall draw resistance of the aerosol generating article when the upstream element is in its final state is smaller than the overall draw resistance of the aerosol generating article when the upstream element is in its initial state. Example 14: The aerosol generating article according to any of Examples 1 to 13, wherein the overall draw resistance of the aerosol generating article when the upstream element is in its final state is at least about 5 percent less than the overall draw resistance of the aerosol generating article when the upstream element is in its initial state. Example 15: The aerosol generating article according to any of Examples 1 to 14, wherein the overall draw resistance of the aerosol generating article when the upstream element is in its final state is at least about 5 mmH2O less than the overall draw resistance of the aerosol generating article when the upstream element is in its initial state. Example 16: The aerosol-generating article according to any of Examples 1 to 15, wherein the overall draw resistance of the aerosol-generating article when the upstream element is in its initial state is at least about 40 mmH2O. Example 17: The aerosol generating article according to any of Examples 1 to 16, wherein the overall draw resistance of the aerosol generating article when the upstream element is in its final state may be about 80 mmH2O or less. Example 18: An aerosol generating article according to any of Examples 1 to 17, wherein the permeability level of the aerosol generating article when the upstream element is in its final state is smaller than the permeability level of the aerosol generating article when the upstream element is in its initial state. Example 19: The aerosol-generating article according to any of Examples 1 to 18, wherein the permeability level of the aerosol-generating article when the upstream element is in its final state is at least about 4 percentage points lower than the permeability level of the aerosol-generating article when the upstream element is in its initial state. Example 20: The aerosol generating article according to any one of Examples 1 to 19, wherein the aerosol generating article has an air permeability level of at least about 30 percent when the upstream element is in its initial state. Example 21: The aerosol generating article is the aerosol generating article according to any one of Examples 1 to 20, wherein the aerosol generating article has an air permeability level of approximately 60 percent or less when the upstream element is in its final state. Example 22: The obstruction element is substantially located throughout the airflow channel in the longitudinal direction when the upstream element is in its initial state, in the aerosol generating article according to any one of Examples 1 to 21. Example 23: The obstruction element is an aerosol generating article according to any one of Examples 1 to 21, which is located outside the long-axis airflow channel when the upstream element is in its initial state. Example 24: The upstream element is an aerosol generating article as described in any of Examples 1 to 23, located at the upstream end of the aerosol generating article. Example 25: The aerosol generating article according to any of Examples 1 to 24, wherein the airflow channel in the longitudinal direction has a width of at least about 0.5 millimeters. Example 26: The aerosol generating article according to any one of Examples 1 to 25, wherein the airflow channel in the longitudinal direction extends along the entire length of the upstream element. Example 27: The obstruction element has substantially the same cross-sectional shape as the airflow channel in the longitudinal direction, as described in any of Examples 1 to 26, an aerosol generating article. Example 28: The obstruction element extends along the entire length of the upstream element, in the aerosol-generating article according to any of Examples 1 to 27. Example 29: The aerosol generating article according to any one of Examples 1 to 28 comprises an upstream element comprising a plurality of longitudinal airflow channels and a plurality of obstruction elements. Example 30: The aerosol generating article according to any one of Examples 1 to 29, wherein the upstream element is provided with an upstream plug, and a longitudinal airflow channel is defined inside the upstream plug. Example 31: An aerosol generating article according to any one of Examples 1 to 30, further comprising a ventilation zone located downstream of the aerosol generating substrate. Example 32: The aerosol generating article according to Example 31, further comprising a tubular element located downstream of the aerosol generating substrate, wherein the ventilation zone is provided along the tubular element. Example 33: An aerosol generating system comprising an aerosol generating article described in any of Examples 1 to 32, and an aerosol generating device configured to heat the aerosol generating substrate of the aerosol generating article, wherein the aerosol generating device comprises a housing that defines a cavity configured to receive the aerosol generating article.

[0262] Further explanation in this disclosure will be provided with reference only to the accompanying drawings. [Brief explanation of the drawing]

[0263] [Figure 1] Figure 1 shows a schematic side cross-sectional view of an aerosol generating article according to a first aspect of the present disclosure, which includes an upstream element in an initial state. [Figure 2] Figure 2 shows a schematic side cross-sectional view of the aerosol generating article shown in Figure 1, where the upstream element changes state from the initial state to the final state. [Figure 3] Figure 3 shows a schematic side perspective view of the upstream element in its initial state as shown in Figure 1. [Figure 4] Figure 4 shows several schematic side cross-sectional views of an aerosol generating system according to a second aspect of the present disclosure, comprising an aerosol generating article according to a first aspect of the present disclosure having an upstream element, and an aerosol generating device. [Figure 5] Figure 5 shows a schematic side perspective view of the upstream element of the aerosol generating article shown in Figure 4. [Figure 6] Figure 6 shows a schematic side perspective view of another upstream element for an aerosol-generating article according to a first aspect of the present disclosure. [Figure 7] Figure 7 shows a schematic side perspective view of another upstream element for an aerosol-generating article according to a first aspect of the present disclosure. [Modes for carrying out the invention]

[0264] Figure 1 shows an aerosol generating article 100, which includes an aerosol generating substrate 10, an upstream element 20 located upstream of the aerosol generating substrate 10, and a downstream section 30 located downstream of the aerosol generating substrate 10 and extending to the downstream end of the aerosol generating article.

[0265] The downstream section 30 includes a tubular element 32 abutting against the downstream end of the aerosol generating substrate 10. The downstream section 30 also includes a filter element 34 located downstream of the tubular element 32 and abutting against the tubular element 32. The filter element 34 includes a plug made of cellulose acetate tow.

[0266] The aerosol generating article also includes a ventilation zone arranged along the downstream section 30. In particular, the ventilation zone is arranged along the tubular element 32. The ventilation zone includes a circumferential row of perforations or holes 40 extending through the tubular wall of the tubular element 32 for the purpose of allowing air to flow from outside the aerosol generating article 100 into the internal cavity defined by the tubular element 32.

[0267] The upstream element 20 extends to the upstream end of the aerosol generating article and abuts against the upstream end of the aerosol generating substrate 10.

[0268] The upstream element 20 is configured to change its state from an initial state (shown in Figure 1) to a final state (shown in Figure 2) during heating when the aerosol generating article 100 is used.

[0269] The upstream element 20 includes a plug 22 made of cellulose acetate tow, an axially extending air flow channel 24 defined inside the plug 22 made of cellulose acetate tow, and an obstruction element 26.

[0270] In the initial state (shown in FIGS. 1 and 3), the airflow channel 24 in the longitudinal axis direction is blocked by the obstacle element 26, thereby substantially preventing the airflow from flowing through the airflow channel 24 in the longitudinal axis direction. The obstacle element 26 is substantially entirely disposed inside the airflow channel 24 in the longitudinal axis direction. The obstacle element 26 has substantially the same size and shape as the airflow channel 24 in the longitudinal axis direction. The obstacle element 26 extends from the upstream end of the upstream element 20 to the downstream end of the upstream element 20. The obstacle element 26 is a solid rod. In particular, the obstacle element 26 is a solid rod made of compressed stearin powder. In some other examples, the obstacle element may be in the form of loose powder.

[0271] The airflow channel 24 in the longitudinal axis direction is substantially cylindrical and has a diameter of about 1.5 millimeters. Accordingly, the obstacle element 24 is also substantially cylindrical and has a diameter of about 1.5 mm.

[0272] In the final state (shown in FIG. 2), the airflow channel 24 in the longitudinal axis direction is open, thereby enabling the airflow to flow through the airflow channel 24 in the longitudinal axis direction.

[0273] During heating when the aerosol generating article 100 is used, the upstream element 22 changes its state from the initial state to the final state. In particular, during heating when the aerosol generating article 100 is used, the obstacle element 26 is heated, melts and flows out, and is absorbed by the plug 22 made of cellulose acetate tow. Accordingly, the airflow channel 24 in the longitudinal axis direction may be substantially empty when the upstream element 20 is in the final state.

[0274] Thus, when the upstream element 20 changes its state from the initial state to the final state during heating when the aerosol generating article 100 is used, the draw resistance of the upstream element 20 decreases. During heating when the aerosol generating article 100 is used, the overall draw resistance of the aerosol generating article 100 also decreases.

[0275] When the upstream element 20 changes its state from the initial state to the final state, and the upstream element 20 reduces its draw resistance, the air permeability level of the aerosol generating article 100 also decreases. In an aerosol generating article 100 that has a high air permeability level when the upstream element 20 is in the initial state and a low air permeability level when the upstream element 20 is in the final state, it may mean that the aerosol generated during the user's initial few inhalations is cooled more significantly than the aerosol generated during the user's subsequent inhalations. This may ensure that the aerosol delivered to the user throughout the entire user experience is at an acceptable temperature.

[0276] The upstream element 22 has a length of approximately 5 millimeters. The aerosol generating substrate 10 has a length of approximately 12 millimeters. The tubular element 32 has a length of approximately 21 millimeters. The mouthpiece element 34 has a length of approximately 7 millimeters. Therefore, the aerosol generating article has a length of approximately 45 millimeters.

[0277] The aerosol-generating article has an outer diameter of approximately 7.3 millimeters.

[0278] Figure 4 shows a portion of the aerosol generation system 1000, which includes an aerosol generating article 200 and an aerosol generating device 250. In particular, Figure 4 shows a portion of the aerosol generating device 250.

[0279] In Figure 4, the aerosol generating article 200 is inserted into the cavity 254 of the aerosol generating device 250.

[0280] The aerosol generating article 200 has an upstream element 120. Figure 4 shows the aerosol generating article 200 with the upstream element 120 in its initial state.

[0281] The aerosol-generating article 200 shown in Figure 4 has substantially the same structure as the aerosol-generating article 100 shown in Figures 1 and 2. In Figures 1, 2 and 4, the same reference numerals are used to specify the same components.

[0282] The aerosol generating substrate 10, tubular element 32, ventilation hole 40, and filter element 34 shown in Figure 4 are the same as those shown in Figures 1 and 2, respectively.

[0283] The aerosol generating article 200 shown in Figure 4 differs from the aerosol generating article 100 shown in Figures 1 and 2 in that the airflow channel 124 in the longitudinal direction does not extend to either the upstream or downstream end of the upstream element 120. The airflow channel 124 in the longitudinal direction extends along the length of the upstream element 122 for approximately 80 percent of its length.

[0284] Therefore, when the upstream element 120 of the aerosol generating article 200 is in its initial state, the obstruction element 122 does not extend to either the upstream or downstream end of the upstream element 120. Instead, the obstruction element 122 is entirely embedded inside the plug 122, which is made of cellulose acetate tow. The obstruction element 126 extends along the length of the upstream element 122 by approximately 80 percent. Figure 5 shows the upstream element 122 in its initial state.

[0285] The aerosol generator 250 comprises a housing that defines a cavity 254 configured to receive an aerosol generating article 200. The aerosol generator 250 is equipped with an external heating element 258 for resistance heating the aerosol generating substrate 10 of the aerosol generating article 200 during use. During use, the upstream element 120 is indirectly heated by the external heating element 258 of the aerosol generator 250. During use, the external heating element 258 of the aerosol generator 250 heats the aerosol generating substrate 10 of the aerosol generating article 200, and heat from the aerosol generating substrate 10 is conducted to the upstream element 120. The heating of the upstream element 120 causes the obstruction element 122 to melt.

[0286] The aerosol generator 250 is equipped with an air inlet 256 located at the distal end of the cavity 254, which allows air to be drawn in through the aerosol generating article 200 during use.

[0287] Figure 6 shows an example of another upstream element 220 in its initial state. The upstream element 220 shown in Figure 6 has substantially the same structure as the upstream element 20 shown in Figures 1, 2, and 3. In Figures 1, 2, 3, and 6, the same reference numerals are used to specify the same members.

[0288] The upstream element 220 shown in Figure 6 differs from the upstream element 20 shown in Figures 1, 2, and 3 in that the upstream element 220 has three longitudinal airflow channels. The longitudinal airflow channels shown in Figure 6 have substantially the same structure as the longitudinal airflow channels 24 shown in Figures 1, 2, and 3, and these airflow channels also extend from the upstream end of the upstream element 220 to the downstream end of the upstream element 220.

[0289] The upstream element 220 also comprises three corresponding obstruction elements 226, each of which is located inside a corresponding longitudinal airflow channel.

[0290] Figure 7 shows an example of another upstream element 320 in an initial state. The upstream element 320 includes a plurality of longitudinal air flow channels (not shown).

[0291] The upstream element 320 includes an obstruction element 326 provided as a layer disposed at the upstream end of the upstream element 320. In particular, the obstruction element 326 is provided as a coating on the upstream end face of a plug 322 made of cellulose acetate tow of the upstream element 320. This coating covers substantially the entire upstream end face of the plug 322 made of cellulose acetate tow.

[0292] When the upstream element 320 is in the initial state, the obstruction element 326 substantially blocks each of the plurality of longitudinal air flow channels, thereby substantially preventing air flow through the upstream element 326.

[0293] When the state of the upstream element 320 changes from the initial state to the final state, at least most of the plurality of longitudinal air flow channels are at least partially opened, allowing air flow through the longitudinal air flow channels and thus through the upstream element. Thus, the upstream element has a smaller draw resistance when the upstream element is in the final state compared to when it is in the initial state.

[0294] The specific embodiments and examples described above are illustrative of the present invention and do not limit the present invention. It will be understood that other embodiments of the present invention may be implemented and that the specific embodiments and examples described herein are not exhaustive.

Claims

1. Aerosol-generating article, Aerosol generating substrate and An upstream element located upstream of the aerosol generating substrate, comprising an airflow channel in the longitudinal direction and an obstruction element for blocking the airflow channel in the longitudinal direction, The upstream element, when the aerosol-generating article is heated during use, From an initial state in which the airflow channel in the longitudinal direction is blocked by the obstructing element, thereby substantially preventing airflow from passing through the airflow channel in the longitudinal direction, The system is configured to change its state to a final state in which the airflow channel in the longitudinal direction is at least partially opened, thereby allowing airflow to pass through the airflow channel in the longitudinal direction. The upstream element of the aerosol-generating article has a smaller draw resistance in the final state compared to the initial state.

2. The aerosol generating article according to claim 1, wherein the viscosity of the obstructing element decreases when the upstream element changes its state from the initial state to the final state.

3. The aerosol generating article according to claim 1 or 2, wherein the obstructing element has a melting point of about 40 degrees Celsius to about 220 degrees Celsius.

4. The aerosol generating article according to any one of claims 1 to 3, wherein the draw resistance of the upstream element in the final state is at least about 20 percent smaller than the draw resistance of the upstream element in the initial state.

5. The draw resistance of the upstream element in its final state is at least about 90 millimeters H compared to the draw resistance of the upstream element in its final state. 2 The aerosol-generating article according to any one of claims 1 to 4, which is smaller by the amount of O.

6. The aerosol generating article according to any one of claims 1 to 5, further comprising a ventilation zone, wherein the ventilation level of the aerosol generating article when the upstream element is in the final state is smaller than the ventilation level of the aerosol generating article when the upstream element is in the initial state.

7. The aerosol generating article according to claim 6, wherein the ventilation level of the aerosol generating article when the upstream element is in the final state is at least about 5 percentage points lower than the ventilation level of the aerosol generating article when the upstream element is in the initial state.

8. The aerosol generating article according to any one of claims 1 to 7, wherein the overall draw resistance of the aerosol generating article when the upstream element is in the final state is at least about 5 percent less than the overall draw resistance of the aerosol generating article when the upstream element is in the initial state.

9. The aerosol-generating article according to any one of claims 1 to 8, wherein the obstructing element comprises wax.

10. The aerosol generating article according to any one of claims 1 to 9, wherein the obstructing element comprises one or more of stearin, paraffin, glycerin, gum arabic, and sugar.

11. The aerosol generating article according to any one of claims 1 to 10, wherein the obstruction element is located at the upstream end of the upstream element when the upstream element is in its initial state.

12. The aerosol generating article according to any one of claims 1 to 11, wherein the obstruction element is at least partially located within the longitudinal airflow channel when the upstream element is in the initial state.

13. The aerosol generating article according to any one of claims 1 to 12, wherein the airflow channel in the longitudinal direction has a width of at least about 0.5 millimeters.

14. The aerosol generating article according to any one of claims 1 to 13, wherein the upstream element comprises a plug made of cellulose acetate tow, and the longitudinal airflow channel of the upstream element extends through the plug made of cellulose acetate tow.

15. an aerosol generation system, an aerosol generating article according to any one of claims 1 to 14, The aerosol generating device comprises an aerosol generating apparatus configured to heat the aerosol generating substrate of the aerosol generating article, The aerosol generating device is an aerosol generating system comprising a housing that defines a cavity configured to receive the aerosol generating article.

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