Aerosol-generating article having a crushable capsule

Abstract

The aerosol-generating article (10) comprises a mouthpiece filter (12) at a proximal end (14) of the aerosol-generating article. The aerosol-generating article further comprises a cooling element (24) upstream of the mouthpiece filter. The cooling element is hollow and has a length of 14 mm to 21 mm. The mouthpiece filter comprises a cavity (22). A crushable flavor capsule (20) is disposed within the cavity. The mouthpiece filter has a length of 9 mm to 13 mm. The mouthpiece filter comprises a filter wrapper wrapped around the cellulosic filtration material of the mouthpiece filter, the filter wrapper comprising a coating or anti-fouling property. The aerosol-generating system comprises an aerosol-generating device and an aerosol-generating article.

Description

[Technical Field]

[0001] The present invention relates to aerosol-generating articles and aerosol-generating systems. [Background technology]

[0002] It is known to provide aerosol-generating devices for generating inhalable vapors. Such devices may heat an aerosol-forming substrate to a temperature at which one or more components of the aerosol-forming substrate volatilize, without burning the aerosol-forming substrate. The aerosol-forming substrate may be provided as part of an aerosol-generating article. The aerosol-generating article may have a rod shape for insertion of the aerosol-generating article into a cavity (such as a heating chamber) of the aerosol-generating device. A heating element may be disposed in or around the heating chamber for heating the aerosol-forming substrate when the aerosol-generating article is inserted into the heating chamber of the aerosol-generating device.

[0003] It would be desirable to have an aerosol-generating article capable of generating improved aerosols.It would be desirable to have an aerosol-generating article capable of generating flavored aerosols. Summary of the Invention

[0004] According to one embodiment of the present invention, there is provided an aerosol-generating article that may include a mouthpiece filter at the proximal end of the aerosol-generating article. The aerosol-generating article may further include a cooling element upstream of the mouthpiece filter. The cooling element may be hollow and may have a length of 14 mm to 21 mm. The mouthpiece filter may include a cavity. A crushable flavor capsule may be disposed within the cavity. The mouthpiece filter may have a length of 9 mm to 13 mm. [Brief explanation of the drawings]

[0005] [Figure 1] 1 shows a diagram of an aerosol-generating article of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0006] The invention will now be further described, by way of example only, with reference to the accompanying drawings in which:

[0007] FIG. 1 shows an aerosol-generating article 10. The aerosol-generating article has a diameter of 7.3 mm and a length of 45 mm. The aerosol-generating article 10 includes a mouthpiece filter 12 at a downstream end 14. The mouthpiece filter 12 has a length of 10 mm to 12 mm. The downstream end 14 is defined by an airflow through the aerosol-generating article 10, as indicated by an arrow 16 near the downstream end 14. Air enters the aerosol-generating article 10 at the upstream end 18 and exits the aerosol-generating article 10 at the downstream end 14. At the downstream end 14, a user U can inhale the aerosol.

[0008] The mouthpiece further comprises a crushable flavor capsule 20. The crushable flavor capsule 20 has a diameter of 3.2 mm to 3.5 mm. The center of the capsule is 6 mm away from the downstream end 14. Preferably, for a capsule having a diameter of 3.5 mm, the crushable flavor capsule 20 has a weight of 22.8 milligrams, a breaking resistance of 15 N, and an elastic deformation before breaking of 1 mm. The crushable flavor capsule 20 is disposed by being fitted inside the mouthpiece filter 12. Preferably, the crushable flavor capsule 20 is further disposed within a cavity 22 of the mouthpiece. The cavity 22 is shaped to receive the crushable flavor capsule 20. The cavity 22 may have a hollow spherical shape to receive the crushable flavor capsule 20.

[0009] A cooling element 24 is disposed upstream of the mouthpiece filter 12. The cooling element 24 is disposed in abutment with the mouthpiece filter 12. The cooling element 24 is disposed in direct contact with the mouthpiece filter 12. The cooling element 24 has a length of 16 mm to 21 mm. The cooling element 24 is hollow. The cooling element 24 has side walls made of cardboard. The side walls made of cardboard form a cardboard tube. The cooling element 24 has essentially no resistance to withdrawal.

[0010] The cooling element 24 is perforated around its periphery to allow ambient air to be drawn into the cooling element 24. This ambient air mixes with hot air drawn through the aerosol-generating article 10 upstream of the cooling element 24 (described below). The mixing of the ambient air and the hot air allows the air to cool, thereby allowing the formation of an aerosol by condensation of small droplets of vaporized aerosol-forming substrate contained in the hot air. Approximately 10 perforations are provided around the periphery of the cooling element 24. The perforations provide a 40% air permeability. The air permeability is the ratio of the ambient air drawn into the cooling element 24 to the air drawn through the aerosol-generating article 10 upstream of the cooling element 24. The perforations are provided 16 mm from the downstream end 14 of the aerosol-generating article 10.

[0011] Upstream of the cooling element 24, a substrate portion 26 is positioned. The substrate portion 26 comprises an aerosol-forming substrate. The aerosol-forming substrate includes a cut filler and an aerosol former in the form of 18% by weight glycerin. The substrate portion 26 has a length of 12 mm. The aerosol-forming substrate has a density of 0.32 mg / mm 3 and a drawing resistance of 30 mmWG.

[0012] An anterior plug 28 made of cellulose acetate is provided upstream of the base portion 26. The anterior plug 28 has a length of 5 mm.

[0013] The overall length of the aerosol-generating article 10 is 45 mm. The diameter of the aerosol-generating article 10 throughout the entire aerosol-generating article is 7.3 mm. The total drawing resistance of the aerosol-generating article 10 is 44 mmWG.

[0014] According to one embodiment of the present invention, there is provided an aerosol-generating article comprising a mouthpiece filter at a proximal end of the aerosol-generating article. The aerosol-generating article further comprises a cooling element upstream of the mouthpiece filter. The cooling element is hollow and has a length of 14 mm to 21 mm. The mouthpiece filter comprises a cavity. A crushable flavor capsule is disposed within the cavity. The mouthpiece filter has a length of 9 mm to 13 mm.

[0015] By providing an aerosol-generating article with the elements cited herein and a crushable flavor capsule within the cavity of the mouthpiece filter, a reliable method of releasing a desired flavor in the generated aerosol is facilitated. The user can crush the crushable flavor capsule just prior to user experience, so that the flavor is fresh and released only just prior to user experience.

[0016] The crushable flavor capsules may be configured as described in WO 2021 / 094160. In particular, the crushable flavor capsules may contain a tobacco-flavored dry powder formulation as described in WO 2021 / 094160. The crushable flavor capsules may be configured as described in WO 2019 / 105950. In particular, the crushable flavor capsules may be configured as crushable capsules as described in WO 2019 / 105950.

[0017] The length of the cooling element can be between 16mm and 18mm.

[0018] The cooling element advantageously enables the formation of aerosol droplets by cooling the hot air drawn through the cooling element, and the length of the cooling element enables the formation of aerosol droplets of a desired diameter, leading to an improved user experience.

[0019] The mouthpiece filter may be 10 mm to 12 mm in length.

[0020] The mouthpiece filter may be 10 mm in length and the cooling element may be 18 mm in length.

[0021] The mouthpiece filter may be 12 mm in length and the cooling element may be 16 mm in length.

[0022] The combined length of the mouthpiece filter and cooling element may be 28 mm.

[0023] The cooling element may have side walls made of cardboard.

[0024] The structural integrity of the cooling element may be promoted by a cardboard sidewall. The cardboard sidewall may be circular. The cooling element may not include any additional elements other than the cardboard sidewall and potentially tipping paper surrounding the periphery of the cardboard sidewall. The cooling element may include tipping paper surrounding the periphery of the cardboard sidewall. The cooling element may be comprised of cardboard. The cooling element may be comprised of cardboard and tipping paper.

[0025] The tipping paper may extend to one or more elements of the aerosol-generating article, upstream or downstream of the cooling element, to hold the respective elements of the aerosol-generating article together. In particular, the tipping paper may extend downstream toward the mouthpiece filter to hold the cooling element and the mouthpiece filter together. The tipping element may extend upstream toward the base portion, described in more detail below, to hold the cooling element and the base portion together. The tipping paper may be wrapped around one or more of the cooling element, mouthpiece filter, and base portion.

[0026] The length of the aerosol-generating article may be from 43 mm to 47 mm, preferably from 44 mm to 46 mm, more preferably 45 mm.

[0027] The diameter of the aerosol-generating article may be between 7.1 mm and 7.5 mm, preferably between 7.2 mm and 7.4 mm, more preferably 7.3 mm.

[0028] The aerosol-generating article may have a drawing resistance of 36 mmWG to 52 mmWG, preferably 40 mmWG to 48 mmWG, and more preferably 44 mmWG.

[0029] The resistance to withdrawal of an aerosol-generating article may be the sum of the individual resistances to withdrawal of the individual components of the aerosol-generating article. In other words, the resistance to withdrawal of an aerosol-generating article may be the resistance to withdrawal of the substrate portion + the resistance to withdrawal of the cooling element + the resistance to withdrawal of the mouthpiece filter + the resistance to withdrawal of any additional components of the aerosol-generating article that contribute to the resistance to withdrawal. Because the cooling element is hollow, the resistance to withdrawal of the cooling element may be zero or near zero.

[0030] The substrate portion may be located upstream of the cooling element. The substrate portion may comprise an aerosol-forming substrate.

[0031] The aerosol-forming substrate may contain a cut filler. The aerosol-forming substrate may contain 16% to 20% by weight of aerosol formers, preferably 17% to 19% by weight of aerosol formers, and more preferably 18% by weight of aerosol formers.

[0032] The aerosol-forming substrate may have a bulk density of 0.28 mg / mm 3 to 0.36 mg / mm 3 , preferably 0.30 mg / mm 3 to 0.34 mg / mm 3 , more preferably 0.32 mg / mm 3 .

[0033] The base portion may have a pull-out resistance of 24 mmWG to 36 mmWG, preferably 27 mmWG to 33 mmWG, and more preferably 30 mmWG.

[0034] Perforations may be provided in the sidewalls of the cooling element to allow ambient air to be drawn into the cooling element. The perforations may allow for a ventilation rate of 30% to 50%, preferably 35% to 45%, and more preferably 40%.

[0035] The cooling element may also be referred to as a ventilation zone, or perforations may be provided to provide ventilation zones within the cooling element.

[0036] The perforations may be configured as described in PCT / EP2022 / 073899. In particular, the cooling elements of the present application may correspond to the ventilation zones described in PCT / EP2022 / 073899 with corresponding perforations as described in PCT / EP2022 / 073899.

[0037] The crushable flavor capsules may have a diameter of 3.0 mm to 3.7 mm, preferably 3.2 mm to 3.5 mm.

[0038] In this way, the crushable flavor capsule can be securely held within the cavity of the mouthpiece filter, and further, the crushable flavor capsule can be easily crushed by the user prior to user experience.

[0039] The crushable flavor capsule may be positioned at a distance of 4 mm to 8 mm, preferably 5 mm to 7 mm, more preferably 6 mm from the downstream end of the mouthpiece filter.

[0040] This distance may optimize flavor release into the mouthpiece filter, which in turn may provide an optimal flavor experience for the user as the aerosol is drawn through the mouthpiece filter and passes through the crushed flavor capsules.

[0041] The crushable flavor capsules may have a weight of 17 mg to 27 mg, preferably 20 mg to 24 mg, more preferably 21 mg to 23 mg, and most preferably 22.8 mg.

[0042] The crushable flavor capsules may have a breaking resistance of 10N to 20N, preferably 13N to 17N, most preferably 15N.

[0043] This resistance to breaking may prevent the crushable flavor capsule from being inadvertently crushed or damaged, and at the same time, this resistance to breaking may allow the user to easily break the flavor capsule when desired.

[0044] The crushable flavor capsules may have an elastic deformation of 0.7 mm to 1.3 mm, preferably 0.8 mm to 1.2 mm, more preferably 1 mm before crushing.

[0045] This elastic deformation can protect the crushable flavor capsules from inadvertent breakage or crushing when crushed by unintended force.

[0046] Upstream of the base portion, the aerosol-generating article preferably comprises a front plug, which is made of cellulose acetate, and which preferably has a length of between 3 mm and 7 mm, more preferably between 4 mm and 6 mm, and most preferably about 5 mm.

[0047] The present invention further relates to an aerosol generating system comprising an aerosol-generating article as described herein and an aerosol generating device having a cavity for receiving the aerosol-generating article.

[0048] As used herein, the terms "proximal," "distal," "downstream," and "upstream" are used to describe the relative position of a component or portion of a component of an aerosol-generating device or aerosol-generating article with respect to the direction in which a user draws on the aerosol-generating device or aerosol-generating article during use.

[0049] The aerosol generating device may have a mouth end through which the aerosol exits the aerosol generating device and is delivered to the user during use. The mouth end may also be referred to as the proximal end. During use, a user sucks on the proximal or mouth end of the aerosol generating device to inhale the aerosol generated by the aerosol generating device. Alternatively, or particularly preferably, the user may directly suck on an aerosol-generating article inserted into an opening at the proximal end of the aerosol generating device. In this case, the user preferably sucks on the front plug of the aerosol-generating article. The opening at the proximal end of the aerosol generating device may be the opening of a cavity. The cavity may be configured to receive the aerosol-generating article. The aerosol generating device has a distal end opposite the proximal or mouth end. The proximal or mouth end of the aerosol generating device may also be referred to as the downstream end, and the distal end of the aerosol generating device may also be referred to as the upstream end. Components, or portions of components, of an aerosol generating device may be described as being upstream or downstream of one another based on their relative location between the proximal, downstream, or mouth end of the aerosol generating device and the distal or upstream end of the aerosol generating device.

[0050] As used herein, "aerosol-generating device" refers to a device that interacts with an aerosol-forming substrate to generate an aerosol. The aerosol-forming substrate may be part of an aerosol-generating article, for example part of a smoking article. The aerosol-generating device may be a smoking device that interacts with the aerosol-forming substrate of the aerosol-generating article to generate an aerosol that is inhalable directly through the user's mouth into the user's lungs. The aerosol-generating device may be a holder. The device may be an electrically heated smoking device. The aerosol-generating device may comprise a housing, an electrical circuit, a power source, a heating chamber, and a heating element.

[0051] The term "smoking" as used herein in relation to a device, article, system, substrate or otherwise does not refer to conventional smoking, in which the aerosol-forming substrate is completely or at least partially combusted. The aerosol-generating device of the present invention is arranged to heat the aerosol-forming substrate to a temperature below the combustion temperature of the aerosol-forming substrate but above the temperature at which one or more volatile compounds of the aerosol-forming substrate are released, in order to form an inhalable aerosol.

[0052] The aerosol generating device may comprise an electrical circuit. The electrical circuit may comprise a microprocessor, which may be a programmable microprocessor. The microprocessor may be part of a controller. The electrical circuit may comprise further electronic components. The electrical circuit may be configured to regulate the supply of power to the heating element. Power may be supplied to the heating element continuously following activation of the aerosol generating device, or may be supplied intermittently, such as with each puff. Power may be supplied to the heating element in the form of current pulses. The electrical circuit may be configured to monitor the electrical resistance of the heating element and to control the supply of power to the heating element, preferably depending on the electrical resistance of the heating element.

[0053] The aerosol generating device may include a power source, typically a battery, within the main body of the aerosol generating device. In one embodiment, the power source is a lithium-ion battery. Alternatively, the power source may be a nickel-metal hydride battery, a nickel-cadmium battery, or a lithium-based battery (e.g., a lithium-cobalt battery, a lithium iron phosphate battery, a lithium titanate battery, or a lithium polymer battery). Alternatively, the power source may be another form of charge storage device, such as a capacitor. The power source may require recharging and may have a capacity that allows for storage of energy sufficient for one or more use experiences; for example, the power source may have a capacity sufficient to continuously generate aerosol for approximately a six-minute period, or a multiple of six minutes. In another example, the power source may have a capacity sufficient to provide a predetermined number of puffs or discontinuous activation of the heating element.

[0054] The cavity of the aerosol generating device may have an open end into which the aerosol-generating article is inserted. The open end may be a proximal end. The cavity may have a closed end opposite the open end. The closed end may be a base of the cavity. The closed end may be closed except for the provision of an air opening disposed within the base. The base of the cavity may be flat. The base of the cavity may be circular. The base of the cavity may be disposed upstream of the cavity. The open end may be disposed downstream of the cavity. The cavity may have an elongated extension. The cavity may have a longitudinal central axis. The longitudinal axis may be a direction extending along the longitudinal central axis between the open end and the closed end. The longitudinal central axis of the cavity may be parallel to the longitudinal axis of the aerosol generating device.

[0055] The cavity may be configured as a heating chamber. The cavity may have a cylindrical shape. The cavity may have a hollow cylindrical shape. The cavity may have a shape corresponding to the shape of the aerosol-generating article to be received within the cavity. The cavity may have a circular cross-section. The cavity may have an elliptical or rectangular cross-section. The cavity may have an inner diameter corresponding to the outer diameter of the aerosol-generating article.

[0056] An airflow channel may extend through the cavity. Ambient air may be drawn through the airflow channel into the aerosol-generating device, into the cavity, and toward the user. Downstream of the cavity, a mouthpiece may be disposed, or the user may inhale the aerosol-generating article directly. The airflow channel may extend through the mouthpiece.

[0057] In any aspect of the present disclosure, the heating element may include an electrically resistive material. Suitable electrically resistive materials include, but are not limited to, semiconductors such as doped ceramics, "conductive" ceramics (e.g., molybdenum disilicide), carbon, graphite, metals, alloys, and composites made of ceramic and metallic materials. Such composites may include doped or undoped ceramics. An example of a suitable doped ceramic is doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum platinum, gold, and silver. Examples of suitable metal alloys include stainless steel, nickel-containing, cobalt-containing, chromium-containing, aluminum-containing, titanium-containing, zirconium-containing, hafnium-containing, niobium-containing, molybdenum-containing, tantalum-containing, tungsten-containing, tin-containing, gallium-containing, manganese-containing, gold-containing, and iron-containing alloys, as well as nickel-, iron-, cobalt-, and stainless steel-based superalloys, Timetal®, and iron-manganese-aluminum-based alloys. In composite materials, the electrically resistive material may optionally be embedded in, encapsulated in, or coated with the insulating material, or vice versa, depending on the required energy transfer kinetics and external physicochemical properties.

[0058] As described, in any aspect of the present disclosure, the heating element may be part of the aerosol-generating device. The aerosol-generating device may include an internal heating element, an external heating element, or both an internal and an external heating element, where "internal" and "external" refer to the aerosol-forming substrate. The internal heating element may take any suitable form. For example, the internal heating element may take the form of a heating blade. Alternatively, the internal heater may take the form of a casing or substrate having different conductive portions or an electrically resistive metal tube. Alternatively, the internal heating element may be one or more heated needles or rods that pass through the center of the aerosol-forming substrate. Other alternatives include a heated wire or filament, such as Ni-Cr (nickel-chromium), platinum, tungsten, or alloy wire or heating plate. Optionally, the internal heating element may be disposed within or on a rigid carrier material. In one such embodiment, the electrically resistive heating element may be formed using a metal that has a well-defined relationship between temperature and resistivity. In such an exemplary device, the metal may be formed as a track on a suitable insulating material, such as a ceramic material, and then sandwiched in another insulating material, such as glass. The heater thus formed may be used to both heat the heating element and monitor its temperature during operation.

[0059] The external heating element may take any suitable form. For example, the external heating element may take the form of one or more flexible heating foils on a dielectric substrate such as polyimide. The flexible heating foils can be shaped to fit the periphery of the substrate-receiving cavity. Alternatively, the external heating element may take the form of a metal grid, a flexible printed circuit board, a molded-in circuit component (MID), a ceramic heater, a flexible carbon fiber heater, or may be formed using a coating technique such as plasma deposition on a suitably shaped substrate. The external heating element may also be formed using a metal that has a well-defined relationship between temperature and resistivity. In such an exemplary device, the metal may be formed as a track between two layers of suitable insulating material. The external heating element thus formed may be used both to heat the external heating element and to monitor the temperature of the external heating element during operation.

[0060] As an alternative to an electrically resistive heating element, the heating element may be configured as an induction heating element. The induction heating element may include an induction coil and a susceptor. Generally, the susceptor is a material capable of generating heat when penetrated by an alternating magnetic field. When placed within the alternating magnetic field, if the susceptor is conductive, eddy currents are typically induced by the alternating magnetic field. If the susceptor is magnetic, another effect that typically contributes to heating is commonly referred to as hysteresis loss. Hysteresis loss occurs primarily due to the movement of magnetic domain blocks within the susceptor as their magnetic orientation aligns with the alternating induced magnetic field. Another effect that contributes to hysteresis loss is when magnetic domains expand or contract within the susceptor. Generally, all of these changes that occur within the susceptor at the nanoscale or below generate heat within the susceptor, and are therefore referred to as "hysteresis loss." Thus, if the susceptor is both magnetic and conductive, both hysteresis loss and the generation of eddy currents will contribute to the heating of the susceptor. If the susceptor is magnetic but not conductive, hysteresis loss will be the only means by which the susceptor will heat when penetrated by an alternating magnetic field. According to the present invention, the susceptor may be conductive or magnetic, or both conductive and magnetic. The alternating magnetic field generated by one or several induction coils heats the susceptor, which then transfers heat to the aerosol-forming substrate, thereby forming the aerosol. Heat transfer may be primarily by conduction. Such heat transfer is best when the susceptor is in intimate thermal contact with the aerosol-forming substrate.

[0061] The term "aerosol-generating article" as used herein refers to an article comprising an aerosol-forming substrate capable of emitting a volatile compound capable of forming an aerosol. For example, the aerosol-generating article may be a smoking article that generates an aerosol that can be inhaled directly through the user's mouth into the user's lungs. The aerosol-generating article may be disposable.

[0062] The term "aerosol-forming substrate" as used herein relates to a substrate capable of emitting one or more volatile compounds capable of forming an aerosol. Such volatile compounds may be emitted by heating the aerosol-forming substrate. The aerosol-forming substrate may conveniently be part of an aerosol-generating article or a smoking article.

[0063] The aerosol-forming substrate may be a solid aerosol-forming substrate. The aerosol-forming substrate may include both solid and liquid components. The aerosol-forming substrate may include a tobacco-containing material containing volatile tobacco flavor compounds that are released from the substrate upon heating. The aerosol-forming substrate may include a non-tobacco material. The aerosol-forming substrate may include an aerosol former that facilitates the formation of a dense and stable aerosol. Examples of suitable aerosol formers are glycerin and propylene glycol.

[0064] The aerosol-generating substrate preferably comprises a homogenized tobacco material, an aerosol former, and water. Most preferably, the aerosol-generating substrate comprises a cut filler and glycerin as the aerosol former. Providing a homogenized tobacco material may improve aerosol generation and the nicotine content and flavor profile of the aerosol generated during heating of the aerosol-generating article. Specifically, the process of making homogenized tobacco involves grinding tobacco leaves, which allows for more efficient release of nicotine and flavor upon heating.

[0065] The use of a cellulose-based filter material in a mouthpiece filter can improve the sustainability of the mouthpiece filter. In particular, the conventionally used cellulose acetate may be undesirable from a sustainability perspective. The cellulose-based filter material can be a sustainable alternative to cellulose acetate.

[0066] The cellulosic filtration material may include a fibrous material including a plurality of regenerated cellulose fibers, which may be one or more of viscose fibers, modal fibers, lyocell fibers, and viscose rayon fibers.

[0067] The cellulosic filtration material may include a fibrous material including a plurality of natural fibers, which may be one or more of flax, hemp, jute, kenaf, ramie, abaca, phormium, sisal, coal, cotton, and kapok.

[0068] The additive may be provided within the cellulosic filtration material. The additive may preferably be a fluid phenol adsorbent. Particularly preferably, triethyl citrate is added as the phenol adsorbent to the cellulosic filtration material at about 3% by weight. The fluid-impermeable coating may prevent the fluid additive from contacting the filter wrapper, thereby preventing contamination of the filter wrapper and preventing the filter wrapper from becoming waterlogged. Furthermore, capsule breakage may lead to the release of liquid components that may contaminate the filter wrapper. All of this can be prevented by providing a coating for the filter wrapper, particularly a fluid-impermeable coating for the filter wrapper. [Example]

[0069] The following provides a non-exhaustive list of non-limiting examples, any one or more of the features of which may be combined with any one or more features of another example, embodiment, or aspect described herein.

[0070] Example 1 An aerosol-generating article, comprising: a mouthpiece filter at the proximal end of the aerosol-generating article; a cooling element upstream of the mouthpiece filter, the cooling element being hollow and having a length of 14 mm to 21 mm; An aerosol-generating article, wherein the mouthpiece filter comprises a cavity, a crushable flavor capsule is disposed within the cavity, and the mouthpiece filter has a length of 9 mm to 13 mm. Preferably, the mouthpiece filter comprises a filter wrapper wrapped around the cellulosic filtration material of the mouthpiece filter, and preferably the filter wrapper comprises a coating or anti-fouling property. Example 2. 10. The aerosol-generating article of claim 1, wherein the coating of the filter wrapper is a fluid-impermeable coating. Example 3. 3. An aerosol-generating article according to any one of Examples 1 and 2, wherein the cellulosic filtering material does not contain cellulose acetate. Example 4. 4. An aerosol-generating article according to any one of Examples 1 to 3, wherein the cellulosic filtering material comprises a paper material, preferably the cellulosic filtering material comprises a nonwoven paper material. Example 5. 5. The aerosol-generating article of any one of Examples 1 to 4, wherein the cellulosic filtration material comprises an additive, preferably the additive is a phenol adsorbent, more preferably the additive comprises triethyl citrate, preferably liquid triethyl citrate. Example 6 6. An aerosol-generating article according to any one of Examples 1 to 5, wherein the coating is provided on only one side of the filter wrapper, preferably the coating is provided on the side of the filter wrapper facing the cellulosic filtration material. Example 7 7. The aerosol-generating article of any one of Examples 1 to 6, wherein the coating comprises a cellulose derivative, preferably one or more of ethyl cellulose, micronized cellulose fibers, and carboxymethyl cellulose. Example 8 8. The aerosol-generating article of any one of Examples 1 to 7, wherein the coating comprises a fluorinated coating. Example 9. 9. The aerosol-generating article of any one of Examples 1 to 8, wherein the coating comprises one or more of acrylate, styrene, butadiene, starch, starch derivatives, cellulose derivatives, alginate, polyvinyl alcohol, polyvinyl acetate, polyfluoroalkyl, gelatin, biowax, and gum. Example 10. 10. An aerosol-generating article according to any one of Examples 1 to 9, wherein the coating is configured as a hardness-enhancing coating. Example 11 An aerosol-generating article according to any one of Examples 1 to 10, wherein the length of the cooling element is 16 mm to 18 mm. Example 12 12. The aerosol-generating article according to any one of Examples 1 to 11, wherein the length of the mouthpiece filter is 10 mm to 12 mm. Example 13 An aerosol-generating article according to any one of Examples 1 to 12, wherein the mouthpiece filter has a length of 10 mm and the cooling element has a length of 18 mm. Example 14. An aerosol-generating article according to any one of Examples 1 to 4, wherein the mouthpiece filter has a length of 12 mm and the cooling element has a length of 16 mm. Example 15. An aerosol-generating article according to any one of Examples 1 to 14, wherein the combined length of the mouthpiece filter and cooling element is 28 mm. Example 16. 16. An aerosol-generating article according to any one of Examples 1 to 15, wherein the cooling element has a sidewall made from cardboard. Example 17. An aerosol-generating article according to any one of Examples 1 to 16, wherein the length of the aerosol-generating article is 43 mm to 47 mm, preferably 44 mm to 46 mm, more preferably 45 mm. Example 18. An aerosol-generating article according to any one of Examples 1 to 17, wherein the diameter of the aerosol-generating article is 7.1 mm to 7.5 mm, preferably 7.2 mm to 7.4 mm, more preferably 7.3 mm. Example 19. An aerosol-generating article according to any one of Examples 1 to 18, wherein the withdrawal resistance of the aerosol-generating article is 36 mmWG to 52 mmWG, preferably 40 mmWG to 48 mmWG, and more preferably 44 mmWG. Example 20. 20. An aerosol-generating article according to any preceding claim, wherein the aerosol-generating article further comprises a substrate portion upstream of the cooling element, the substrate portion comprising an aerosol-forming substrate. Example 21. 16. The aerosol-generating article of example 15, wherein the aerosol-forming substrate comprises a cut filler, preferably the aerosol-forming substrate comprises 16% to 20% by weight of the aerosol former, preferably 17% to 19% by weight of the aerosol former, more preferably 18% by weight of the aerosol former. Example 22. The aerosol-forming substrate is 0.28 mg / mm 3 ~0.36mg / mm 3 , preferably 0.30 mg / mm 3 ~0.34mg / mm 3 , more preferably 0.32 mg / mm 3 17. The aerosol-generating article of claim 15 or 16, having a bulk density of Example 23. 18. The aerosol-generating article according to any one of Examples 15 to 17, wherein the base portion has a withdrawal resistance of 24 mmWG to 36 mmWG, preferably 27 mmWG to 33 mmWG, and more preferably 30 mmWG. Example 24. 24. An aerosol-generating article according to any one of Examples 1 to 23, wherein perforations are provided in the sidewall of the cooling element to allow ambient air to be drawn into the cooling element, preferably the perforations allowing a ventilation rate of 30% to 50%, preferably 35% to 45%, more preferably 40%. Example 25. 25. An aerosol-generating article according to any one of Examples 1 to 24, wherein the crushable flavour capsule has a diameter of 3.0 mm to 3.7 mm, preferably 3.2 mm to 3.5 mm. Example 26. An aerosol-generating article according to any one of Examples 1 to 25, wherein the crushable flavor capsule is positioned at a distance of 4 mm to 8 mm, preferably 5 mm to 7 mm, more preferably 6 mm, from the downstream end of the mouthpiece filter. Example 27. 27. An aerosol-generating article according to any one of Examples 1 to 26, wherein the crushable flavour capsule has a weight of 17 mg to 27 mg, preferably 20 mg to 24 mg, more preferably 21 mg to 23 mg, and most preferably 22.8 mg. Example 28. 28. An aerosol-generating article according to any one of Examples 1 to 27, wherein the crushable flavour capsule has a breaking resistance of 10N to 20N, preferably 13N to 17N, most preferably 15N. Example 29. An aerosol-generating article according to any one of Examples 1 to 28, wherein the crushable flavor capsule has an elastic deformation of 0.7 mm to 1.3 mm, preferably 0.8 mm to 1.2 mm, more preferably 1 mm, before crushing. Example 30. An aerosol generating system comprising the aerosol-generating article according to any one of Examples 1 to 29 and an aerosol generating device having a cavity for receiving the aerosol-generating article.

[0071] Features described with respect to one embodiment may be equally applied to other embodiments of the invention.

Claims

1. An aerosol-generating article comprising: a mouthpiece filter at the proximal end of the aerosol-generating article; a cooling element upstream of the mouthpiece filter, the cooling element being hollow and having a length of between 14 mm and 21 mm; 1. An aerosol-generating article, wherein the mouthpiece filter comprises a cavity, a crushable flavor capsule is disposed within the cavity, the mouthpiece filter has a length of 9 mm to 13 mm, and the mouthpiece filter comprises a filter wrapper wrapped around a cellulosic filtration material of the mouthpiece filter, the filter wrapper comprising a coating or anti-fouling property.

2. 10. The aerosol-generating article of claim 1, wherein the coating of the filter wrapper is a fluid-impermeable coating.

3. 3. The aerosol-generating article of claim 1, wherein the cellulosic filtering material does not contain cellulose acetate.

4. 4. An aerosol-generating article according to any preceding claim, wherein the cellulosic filtering material comprises a paper material, preferably wherein the cellulosic filtering material comprises a nonwoven paper material.

5. 5. An aerosol-generating article according to any one of claims 1 to 4, wherein the cellulosic filtration material comprises an additive, preferably the additive is a phenol adsorbent, more preferably the additive comprises triethyl citrate, preferably liquid triethyl citrate.

6. 6. An aerosol-generating article according to any one of claims 1 to 5, wherein the coating is provided on only one side of the filter wrapper, preferably on the side of the filter wrapper facing the cellulosic filtration material.

7. 7. An aerosol-generating article according to any preceding claim, wherein the coating comprises a cellulose derivative, preferably one or more of ethyl cellulose, micronized cellulose fibres and carboxymethyl cellulose.

8. 8. The aerosol-generating article of claim 1, wherein the coating comprises a fluorinated coating.

9. 9. The aerosol-generating article of claim 1, wherein the coating comprises one or more of acrylate, styrene, butadiene, starch, starch derivatives, cellulose derivatives, alginate, polyvinyl alcohol, polyvinyl acetate, polyfluoroalkyl, gelatin, biowax, and gum.

10. 10. An aerosol-generating article according to any preceding claim, wherein the coating is configured as a hardness-enhancing coating.

11. 11. The aerosol-generating article according to claim 1, wherein the cooling element has a length of 16 mm to 18 mm.

12. 12. The aerosol-generating article according to claim 1, wherein the mouthpiece filter has a length of 10 mm to 12 mm.

13. 13. An aerosol-generating article according to any preceding claim, wherein the cooling element has a sidewall made from cardboard.

14. 14. An aerosol-generating article according to any one of claims 1 to 13, wherein the withdrawal resistance of the aerosol-generating article is from 36 mmWG to 52 mmWG, preferably from 40 mmWG to 48 mmWG, and more preferably 44 mmWG.

15. 15. An aerosol-generating article according to any preceding claim, wherein the aerosol-generating article further comprises a substrate portion upstream of the cooling element, the substrate portion comprising an aerosol-forming substrate.

16. 16. The aerosol-generating article of claim 15, wherein the aerosol-forming substrate comprises a cut filler, preferably the aerosol-forming substrate comprises 16% to 20% by weight of aerosol formers, preferably 17% to 19% by weight of aerosol formers, more preferably 18% by weight of aerosol formers.

17. The aerosol-forming substrate has a concentration of 0.28 mg / mm 3 ~0.36mg / mm 3 , preferably 0.30 mg / mm 3 ~0.34mg / mm 3 , more preferably 0.32 mg / mm 3 17. The aerosol-generating article of claim 15 or 16, having a bulk density of

18. 18. An aerosol-generating article according to any one of claims 15 to 17, wherein the substrate portion has a withdrawal resistance of 24 mmWG to 36 mmWG, preferably 27 mmWG to 33 mmWG, more preferably 30 mmWG.

19. 19. An aerosol-generating article according to any preceding claim, wherein perforations are provided in the side walls of the cooling element to allow ambient air to be drawn into the cooling element, preferably the perforations allowing a permeability of between 30% and 50%, preferably between 35% and 45%, more preferably 40%.

20. 20. An aerosol-generating article according to any preceding claim, wherein the crushable flavour capsule has a diameter of from 3.0 mm to 3.7 mm, preferably from 3.2 mm to 3.5 mm.

21. 21. An aerosol-generating article as described in any one of claims 1 to 20, wherein the crushable flavour capsule is positioned at a distance of 4 mm to 8 mm, preferably 5 mm to 7 mm, more preferably 6 mm, from the downstream end of the mouthpiece filter.

22. 22. An aerosol-generating article according to any preceding claim, wherein the crushable flavour capsule has a resistance to breaking of 10N to 20N, preferably 13N to 17N, most preferably 15N.

23. 23. An aerosol-generating article according to any preceding claim, wherein the crushable flavour capsule has an elastic deformation before crushing of between 0.7 mm and 1.3 mm, preferably between 0.8 mm and 1.2 mm, more preferably 1 mm.

24. An aerosol generating system comprising: an aerosol-generating article according to any one of claims 1 to 23; and an aerosol generating device having a cavity for receiving the aerosol-generating article.

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