EP4648629A1

EP4648629A1 - Aerosol-generating article with crushable capsule

Info

Publication number: EP4648629A1
Application number: EP24700228.0A
Authority: EP
Inventors: Guillaume Bastien BAUR; Liubov CHASSOT
Original assignee: Philip Morris Products SA
Current assignee: Philip Morris Products SA
Priority date: 2023-01-09
Filing date: 2024-01-08
Publication date: 2025-11-19
Also published as: CN120603504A; WO2024149698A1; KR20250131779A; JP2026500586A

Abstract

Aerosol-generating article (10) comprising a mouth piece 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 mouth piece filter. The cooling element is hollow and has a length of between 14 mm and 21 mm. The mouth piece filter comprises a cavity (22). A crushable flavor capsule (20) is arranged in the cavity. The mouth piece filter has a length of between 9 mm and 13 mm. The mouth piece filter comprises a filter wrapper wrapped around cellulosic filtration material of the mouthpiece filter, and wherein the filter wrapper comprises a coating or anti-staining properties. Aerosol-generating system comprising an aerosol-generating device and the aerosol-generating article.

Description

AEROSOL-GENERATING ARTICLE WITH CRUSHABLE CAPSULE

The present invention relates to an aerosol-generating article and an aerosolgenerating system.

It is known to provide an aerosol-generating device for generating an inhalable vapor. Such devices may heat aerosol-forming substrate to a temperature at which one or more components of the aerosol-forming substrate are volatilised without burning the aerosolforming substrate. Aerosol-forming substrate may be provided as part of an aerosolgenerating 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 arranged in or around the heating chamber for heating the aerosol-forming substrate once the aerosol-generating article is inserted into the heating chamber of the aerosol-generating device.

It would be desirable to have an aerosol-generating article with which an improved aerosol can be generated. It would be desirable to have an aerosol-generating article with which a flavoured aerosol can be generated.

According to an embodiment of the invention there is provided an aerosol-generating article that may comprise a mouth piece filter at a proximal end of the aerosol-generating article. The aerosol-generating article may further comprise a cooling element upstream of the mouth piece filter. The cooling element may be hollow and may have a length of between 14 mm and 21 mm. The mouth piece filter may comprise a cavity. A crushable flavor capsule may be arranged in the cavity. The mouth piece filter has a length of between 9 mm and 13 mm.

According to an embodiment of the invention there is provided an aerosol-generating article comprising a mouth piece filter at a proximal end of the aerosol-generating article. The aerosol-generating article further comprises a cooling element upstream of the mouth piece filter. The cooling element is hollow and has a length of between 14 mm and 21 mm. The mouth piece filter comprises a cavity. A crushable flavor capsule is arranged in the cavity. The mouth piece filter has a length of between 9 mm and 13 mm.

Providing an aerosol-generating article with the herein cited elements and a crushable flavor capsule in the cavity of the mouth piece filter facilitates a reliable way to release a desired flavor into the generated aerosol. A user can crush the crushable flavor capsule immediately before a user experience so that the flavor is fresh and only released directly before the user experience.

The crushable flavor capsule may be configured as described in WO 2021/094160. Particularly, the crushable flavor capsule may comprise a tobacco flavoured dry powder formulation as described in WO 2021/094160. The crushable flavor capsule may be configured as described in WO 2019/105950. Particularly, the crushable flavor capsule may be configured as a breakable capsule as described in WO 2019/105950.

The length of the cooling element may be between 16 mm and 18 mm.

The cooling element advantageously enables formation of aerosol droplets due to cooling of the hot air being drawn through the cooling element. The length of the cooling element enables formation of the aerosol droplets of a desired diameter. This leads to an improved user experience.

The length of the mouth piece filter may be between 10 mm and 12 mm.

The length of the mouth piece filter may be 10 mm and the length of the cooling element may be 18 mm.

The length of the mouth piece filter may be 12 mm and the length of the cooling element may be 16 mm.

A combined length of the mouth piece filter and the cooling element may be 28 mm.

The cooling element may have a sidewall made of cardboard.

The structural integrity of the cooling element may be facilitated by the cardboard sidewall. The cardboard sidewall may be circular. Apart from the cardboard sidewall and a potential tipping paper surrounding the periphery of the cardboard sidewall, the cooling element may not comprise further elements. The cooling element may comprise a tipping paper surrounding the periphery of the cardboard sidewall. The cooling element may consist of cardboard. The cooling element may consist of cardboard and the tipping paper.

The tipping paper may extend upstream or downstream of the cooling element to one or more elements of the aerosol-generating article holding the respective elements of the aerosol-generating article together. Particularly, the tipping paper may extend downstream towards the mouth piece filter to hold together the cooling element and the mouth piece filter. The tipping element may extend upstream towards a substrate portion described in more detail below to hold together the cooling element and the substrate portion. The tipping paper may be wrapped around the periphery of one or more of the cooling element, the mouth piece filter and the substrate portion.

A length of the aerosol-generating article may be between 43 mm and 47 mm, preferably between 44 mm and 46 mm, more preferably 45 mm.

A 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.

A resistance to draw of the aerosol-generating article may be between 36 mmWG and 52 mmWG, preferably between 40 mmWG and 48 mmWG, more preferably 44 mmWG. The resistance to draw of the aerosol-generating article may be the sum of the individual resistance to draw values of the individual element of the aerosol-generating article. In other words, the resistance to draw of the aerosol-generating article may be the resistance to draw of the substrate portion plus the resistance to draw of the cooling element plus the resistance to draw of the mouth piece filter plus the resistance to draw of any further element of the aerosol-generating article contributing to the resistance to draw. Due to the hollow nature of the cooling element, the resistance to draw of the cooling element may be zero or close to zero.

The substrate portion may be arranged upstream of the cooling element. The substrate portion may comprise an aerosol-forming substrate.

The aerosol-forming substrate may comprise cut filler. The aerosol-forming substrate may comprise between 16 wt% and 20 wt% aerosol former, preferably between 17 wt% and 19 wt% aerosol former, more preferably 18 wt% aerosol former.

The aerosol-forming substrate may have a bulk density of between 0.28 mg/mm3 and 0.36 mg/mm3, preferably of between 0.30 mg/mm3 and 0.34 mg/mm3, more preferably of 0.32 mg/mm3.

The substrate portion may have a resistance to draw of between 24 mmWG and 36 mmWG, preferably between 27 mmWG and 33 mmWG, more preferably 30 mmWG.

Perforations may be provided in a sidewall of the cooling element enabling ambient air to be drawn into the cooling element. The perforations may enable a ventilation rate of between 30% and 50%, preferably between 35% and 45%, more preferably of 40%.

The cooling element may also be denoted as ventilation zone or a ventilation zone may be provided in the cooling element due to the provision of the perforations.

The perforations may be configured as described in PCT/EP2022/073899. Particularly, the cooling element of the present application may correspond to the ventilation zone as described in PCT/EP2022/073899 having the corresponding perforations described in PCT/EP2022/073899.

The crushable flavor capsule may have a diameter of between 3.0 mm and 3.7 mm, preferably between 3.2 mm and 3.5 mm.

In this way, the crushable flavor capsule may be securely held within the cavity of the mouth piece filter. Further, the crushable flavor capsule may be easily crushed by a user prior to the user experience.

The crushable flavor capsule may be arranged at a distance of between 4 mm and 8 mm, preferably at a distance or between 5 mm and 7 mm, more preferably at a distance of 6 mm, from a downstream end of the mouth piece filter. This distance may optimize the release of the flavor into the mouth piece filter. In other words, this distance may yield the optimal flavor experience for user when drawing the aerosol through the mouth piece filter and past the crushed flavor capsule.

The crushable flavor capsule may have a weight of between 17 mg and 27 mg, preferably of between 20 mg and 24 mg, more preferably of between 21 mg and 23 mg, most preferably of 22.8 mg.

The crushable flavor capsule may have a resistance to breaking of between 10 N and 20 N, preferably of between 13 N and 17 N, most preferably of 15 N.

This resistance to breaking may result in the crushable flavor capsule not being inadvertently crushed or damaged. At the same time, this resistance to breaking enables a user to easily break the flavor capsule when desired.

The crushable flavor capsule may have an elastic deformation before breaking of between 0.7 mm and 1.3 mm, preferably between 0.8 mm and 1.2 mm, more preferably of 1 mm.

This elastic deformation may protect the crushable flavor capsule from inadvertently being damaged or crushed when subjected to an unintentional squeezing force.

Upstream of the substrate portion, the aerosol-generating article preferably comprises a front plug. The front preferably is made of cellulose acetate. The front plug preferably has a length of between 3 mm and 7 mm, more preferably between 4 mm and 6 mm, most preferably around 5 mm.

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

As used herein, the terms ‘proximal’, ‘distal’, ‘downstream’ and ‘upstream’ are used to describe the relative positions of components, or portions of components, of the aerosolgenerating device or the aerosol-generating article in relation to the direction in which a user draws on the aerosol-generating device or the aerosol-generating article during use thereof.

The aerosol-generating device may comprise a mouth end through which in use an aerosol exits the aerosol-generating device and is delivered to a user. The mouth end may also be referred to as the proximal end. In use, a user draws on the proximal or mouth end of the aerosol-generating device in order to inhale an aerosol generated by the aerosolgenerating device. Alternatively, and particularly preferred, a user may directly draw on an aerosol-generating article inserted into an opening at the proximal end of the aerosolgenerating device. In this case, the user preferably draws on the front plug of the aerosolgenerating article. The opening at the proximal end of the aerosol-generating device may be an opening of the cavity. The cavity may be configured to receive the aerosol-generating article. The aerosol-generating device comprises a distal end opposed to 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 the aerosol-generating device may be described as being upstream or downstream of one another based on their relative positions between the proximal, downstream or mouth end and the distal or upstream end of the aerosol-generating device.

As used herein, an ‘aerosol-generating device’ relates 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. An aerosolgenerating device may be a smoking device that interacts with an aerosol-forming substrate of an aerosol-generating article to generate an aerosol that is directly inhalable into a user’s lungs thorough the user's mouth. An aerosol-generating device may be a holder. The device may be an electrically heated smoking device. The aerosol-generating device may comprise a housing, electric circuitry, a power supply, a heating chamber and a heating element.

As used herein with reference to the present invention, the term ‘smoking’ with reference to a device, article, system, substrate, or otherwise does not refer to conventional smoking in which an aerosol-forming substrate is fully 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 a combustion temperature of the aerosol-forming substrate, but at or above a temperature at which one or more volatile compounds of the aerosolforming substrate are released to form an inhalable aerosol.

The aerosol-generating device may comprise electric circuitry. The electric circuitry may comprise a microprocessor, which may be a programmable microprocessor. The microprocessor may be part of a controller. The electric circuitry may comprise further electronic components. The electric circuitry may be configured to regulate a 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 on a puff-by-puff basis. The power may be supplied to the heating element in the form of pulses of electrical current. The electric circuitry may be configured to monitor the electrical resistance of the heating element, and preferably to control the supply of power to the heating element dependent on the electrical resistance of the heating element.

The aerosol-generating device may comprise a power supply, typically a battery, within a main body of the aerosol-generating device. In one embodiment, the power supply is a Lithium-ion battery. Alternatively, the power supply may be a Nickel-metal hydride battery, a Nickel cadmium battery, or a Lithium based battery, for example a Lithium-Cobalt, a Lithium-lron-Phosphate, Lithium Titanate or a Lithium-Polymer battery. As an alternative, the power supply may be another form of charge storage device such as a capacitor. The power supply may require recharging and may have a capacity that enables to store enough energy for one or more usage experiences; for example, the power supply may have sufficient capacity to continuously generate aerosol for a period of around six minutes or for a period of a multiple of six minutes. In another example, the power supply may have sufficient capacity to provide a predetermined number of puffs or discrete activations of the heating element.

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 the base of the cavity. The closed end may be closed except for the provision of air apertures arranged in 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 arranged upstream of the cavity. The open end may be arranged downstream of the cavity. The cavity may have an elongate extension. The cavity may have a longitudinal central axis. A longitudinal direction may be the direction extending between the open and closed ends along the longitudinal central axis. The longitudinal central axis of the cavity may be parallel to the longitudinal axis of the aerosol-generating device.

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 in 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.

An airflow channel may run through the cavity. Ambient air may be drawn into the aerosol-generating device, into the cavity and towards the user through the airflow channel. Downstream of the cavity, a mouthpiece may be arranged or a user may directly draw on the aerosol-generating article. The airflow channel may extend through the mouthpiece.

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

As described, in any of the aspects of the disclosure, the heating element may be part of an aerosol-generating device. The aerosol-generating device may comprise an internal heating element or an external heating element, or both internal and external heating elements, where "internal" and "external" refer to the aerosol-forming substrate. An internal heating element may take any suitable form. For example, an 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 electro-conductive portions, or an electrically resistive metallic tube. Alternatively, the internal heating element may be one or more heating needles or rods that run through the center of the aerosolforming substrate. Other alternatives include a heating wire or filament, for example a Ni-Cr (Nickel-Chromium), platinum, tungsten or alloy wire or a heating plate. Optionally, the internal heating element may be deposited in or on a rigid carrier material. In one such embodiment, the electrically resistive heating element may be formed using a metal having a 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 ceramic material, and then sandwiched in another insulating material, such as a glass. Heaters formed in this manner may be used to both heat and monitor the temperature of the heating elements during operation.

An external heating element may take any suitable form. For example, an 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 conform to the perimeter of the substrate receiving cavity. Alternatively, an external heating element may take the form of a metallic grid or grids, a flexible printed circuit board, a molded interconnect device (MID), ceramic heater, flexible carbon fibre heater or may be formed using a coating technique, such as plasma vapour deposition, on a suitable shaped substrate. An external heating element may also be formed using a metal having a 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 materials. An external heating element formed in this manner may be used to both heat and monitor the temperature of the external heating element during operation. 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 comprise an induction coil and a susceptor. In general, a susceptor is a material that is capable of generating heat, when penetrated by an alternating magnetic field. When located in an alternating magnetic field. If the susceptor is conductive, then typically eddy currents are induced by the alternating magnetic field. If the susceptor is magnetic, then typically another effect that contributes to the heating is commonly referred to hysteresis losses. Hysteresis losses occur mainly due to the movement of the magnetic domain blocks within the susceptor, because the magnetic orientation of these will align with the magnetic induction field, which alternates. Another effect contributing to the hysteresis loss is when the magnetic domains will grow or shrink within the susceptor. Commonly all these changes in the susceptor that happen on a nano-scale or below are referred to as “hysteresis losses”, because they produce heat in the susceptor. Hence, if the susceptor is both magnetic and electrically conductive, both hysteresis losses and the generation of eddy currents will contribute to the heating of the susceptor. If the susceptor is magnetic, but not conductive, then hysteresis losses will be the only means by which the susceptor will heat, when penetrated by an alternating magnetic field. According to the invention, the susceptor may be electrically conductive or magnetic or both electrically conductive and magnetic. An alternating magnetic field generated by one or several induction coils heat the susceptor, which then transfers the heat to the aerosol-forming substrate, such that an aerosol is formed. The heat transfer may be mainly by conduction of heat. Such a transfer of heat is best, if the susceptor is in close thermal contact with the aerosol-forming substrate.

As used herein, the term ‘aerosol-generating article’ refers to an article comprising an aerosol-forming substrate that is capable of releasing volatile compounds that can form an aerosol. For example, an aerosol-generating article may be a smoking article that generates an aerosol that is directly inhalable into a user’s lungs through the user's mouth. An aerosolgenerating article may be disposable.

As used herein, the term ‘aerosol-forming substrate’ relates to a substrate capable of releasing one or more volatile compounds that can form an aerosol. Such volatile compounds may be released by heating the aerosol-forming substrate. An aerosol-forming substrate may conveniently be part of an aerosol-generating article or smoking article.

The aerosol-forming substrate may be a solid aerosol-forming substrate. The aerosolforming substrate may comprise both solid and liquid components. The aerosol-forming substrate may comprise a tobacco-containing material containing volatile tobacco flavour compounds which are released from the substrate upon heating. The aerosol-forming substrate may comprise a non-tobacco material. The aerosol-forming substrate may comprise an aerosol former that facilitates the formation of a dense and stable aerosol. Examples of suitable aerosol formers are glycerine and propylene glycol.

The aerosol-generating substrate preferably comprises homogenised tobacco material, an aerosol-former and water. The aerosol-generating substrate most preferably comprises cut filler and glycerin as an aerosol former. Providing homogenised tobacco material may improve aerosol generation, the nicotine content and the flavour profile of the aerosol generated during heating of the aerosol-generating article. Specifically, the process of making homogenised tobacco involves grinding tobacco leaf, which more effectively enables the release of nicotine and flavours upon heating.

Using cellulosic filtration material in the mouth piece filter may improve sustainability of the mouth piece filter. Particularly, previously used cellulose acetate may be undesired from a sustainability perspective. Cellulosic filtration material may be a sustainable alternative to cellulose acetate.

The cellulosic filtration material may comprise a fibrous material comprising a plurality of regenerated cellulose fibres. The regenerated cellulose fibres may be one or more of viscose fibres, modal fibres, Lyocell fibres and viscose rayon fibres.

The cellulosic filtration material may comprise a fibrous material comprising a plurality of natural fibres. The natural fibres may be one or more of flax fibres, hemp fibres, jute fibres, kenaf fibres, ramie fibres, abaca fibres, phormium fibres, sisal fibres, coir fibres, cotton fibres, and kapok fibres.

An additive may be provided in the cellulosic filtration material. The additive is preferably a fluid phenol scavenger. Particularly preferably, around 3 wt% of triethyl citrate is provided as a phenol scavenger in the cellulosic filtration material. The fluid impermeable coating may prevent the fluid additive to contact the filter wrapper thereby preventing staining of the filter wrapper and preventing the filter wrapper from becoming soggy. Additionally, breakage of the capsule may lead to the release of liquid components which might potentially stain the filter wrapper. All of this may be prevented by the provisioning of a coating of the filter wrapper, particularly a fluid impermeable coating of the filter wrapper.

Below, there is provided a non-exhaustive list of non-limiting examples. Any one or more of the features of these examples may be combined with any one or more features of another example, embodiment, or aspect described herein.

Example ex1. An aerosol-generating article comprising: a mouth piece filter at a proximal end of the aerosol-generating article, and a cooling element upstream of the mouth piece filter, wherein the cooling element is hollow and has a length of between 14 mm and 21 mm, wherein the mouth piece filter comprises a cavity, wherein a crushable flavor capsule is arranged in the cavity, and wherein the mouth piece filter has a length of between 9 mm and 13 mm. Preferably, the mouth piece filter comprises a filter wrapper wrapped around cellulosic filtration material of the mouthpiece filter, and, preferably, the filter wrapper comprises a coating or anti-staining properties.

Example ex2. The aerosol-generating article according to example 1 , wherein the coating of the filter wrapper is a fluid impermeable coating.

Example ex3. The aerosol-generating article according to any of the preceding examples, wherein the cellulosic filtration material is free of cellulose acetate.

Example ex4. The aerosol-generating article according to any of the preceding examples, wherein the cellulosic filtration material comprises a paper material, preferably wherein the cellulosic filtration material comprises a nonwoven paper material.

Example ex5. The aerosol-generating article according to any of the preceding examples, wherein the cellulosic filtration material comprises an additive, preferably wherein the additive is a phenol scavenger, more preferably wherein the additive comprises triethyl citrate, preferably liquid triethyl citrate.

Example ex6. The aerosol-generating article according to any of the preceding examples, wherein the coating is provided only on one side of the filter wrapper, preferably wherein the coating is provided on the side of the filter wrapper facing the cellulosic filtration material.

Example ex7. The aerosol-generating article according to any of the preceding examples, wherein the coating comprises cellulose derivatives, preferably one or more of ethyl cellulose, microf ibrillated cellulose and carboxymethyl cellulose.

Example ex8. The aerosol-generating article according to any of the preceding examples, wherein the coating comprises fluorinated coatings.

Example ex9. The aerosol-generating article according to any of the preceding examples, wherein the coating comprises one or more of: an acrylate, a styrene, a butadiene, a starch, a starch derivative, a cellulose derivative, an alginate, a polyvinyl alcohol, a polyvinyl acetate, polyfluoroalkyl, a gelatin, bio-wax and a gum.

Example ex10. The aerosol-generating article according to any of the preceding claims, wherein the coating is configured as a hardness-enhancing coating.

Example ex11. The aerosol-generating article according to any of the preceding examples, wherein the length of the cooling element is between 16 mm and 18 mm. Example ex12. The aerosol-generating article according to any of the preceding examples, wherein the length of the mouth piece filter is between 10 mm and 12 mm.

Example ex13. The aerosol-generating article according to any of the preceding examples, wherein the length of the mouth piece filter is 10 mm and the length of the cooling element is 18 mm.

Example ex14. The aerosol-generating article according to any of examples ex1 to ex4, wherein the length of the mouth piece filter is 12 mm and the length of the cooling element is 16 mm.

Example ex15. The aerosol-generating article according to any of the preceding examples, wherein a combined length of the mouth piece filter and the cooling element is 28 mm.

Example ex16. The aerosol-generating article according to any of the preceding examples, wherein the cooling element has a sidewall made of cardboard.

Example ex17. The aerosol-generating article according to any of the preceding examples, wherein a length of the aerosol-generating article is between 43 mm and 47 mm, preferably between 44 mm and 46 mm, more preferably 45 mm.

Example ex18. The aerosol-generating article according to any of the preceding examples, wherein a diameter of the aerosol-generating article is between 7.1 mm and 7.5 mm, preferably between 7.2 mm and 7.4 mm, more preferably 7.3 mm.

Example ex19. The aerosol-generating article according to any of the preceding examples, wherein a resistance to draw of the aerosol-generating article is between 36 mmWG and 52 mmWG, preferably between 40 mmWG and 48 mmWG, more preferably 44 mmWG.

Example ex20. The aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating article further comprises a substrate portion upstream of the cooling element, wherein the substrate portion comprises an aerosolforming substrate.

Example ex21. The aerosol-generating article according to example ex15, wherein the aerosol-forming substrate comprises cut filler, preferably wherein the aerosolforming substrate comprises between 16 wt% and 20 wt% aerosol former, preferably between 17 wt% and 19 wt% aerosol former, more preferably 18 wt% aerosol former.

Example ex22. The aerosol-generating article according to example ex15 or ex16, wherein the aerosol-forming substrate has a bulk density of between 0.28 mg/mm³ and 0.36 mg/mm³, preferably of between 0.30 mg/mm³ and 0.34 mg/mm³, more preferably of 0.32 mg/mm³. Example ex23. The aerosol-generating article according to any of examples ex15 to ex17, wherein the substrate portion has a resistance to draw of between 24 mmWG and 36 mmWG, preferably between 27 mmWG and 33 mmWG, more preferably 30 mmWG.

Example ex24. The aerosol-generating article according to any of the preceding examples, wherein perforations are provided in a sidewall of the cooling element enabling ambient air to be drawn into the cooling element, preferably wherein the perforations enable a ventilation rate of between 30% and 50%, preferably between 35% and 45%, more preferably of 40%.

Example ex25. The aerosol-generating article according to any of the preceding examples, wherein the crushable flavor capsule has a diameter of between 3.0 mm and 3.7 mm, preferably between 3.2 mm and 3.5 mm.

Example ex26. The aerosol-generating article according to any of the preceding examples, wherein the crushable flavor capsule is arranged at a distance of between 4 mm and 8 mm, preferably at a distance or between 5 mm and 7 mm, more preferably at a distance of 6 mm, from a downstream end of the mouth piece filter.

Example ex27. The aerosol-generating article according to any of the preceding examples, wherein the crushable flavor capsule has a weight of between 17 mg and 27 mg, preferably of between 20 mg and 24 mg, more preferably of between 21 mg and 23 mg, most preferably of 22.8 mg.

Example ex28. The aerosol-generating article according to any of the preceding examples, wherein the crushable flavor capsule has a resistance to breaking of between 10 N and 20 N, preferably of between 13 N and 17 N, most preferably of 15 N.

Example ex29. The aerosol-generating article according to any of the preceding examples, wherein the crushable flavor capsule has an elastic deformation before breaking of between 0.7 mm and 1.3 mm, preferably between 0.8 mm and 1.2 mm, more preferably of 1 mm.

Example ex30. An aerosol-generating system comprising an aerosolgenerating article according to any of the preceding examples and an aerosol-generating device having a cavity for receiving the aerosol-generating article.

Features described in relation to one embodiment may equally be applied to other embodiments of the invention.

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

Fig. 1 shows an illustration of the aerosol-generating article of the present invention. Figure 1 shows an aerosol-generating article 10. The aerosol-generating article 10 has a diameter of 7.3 mm and a length of 45 mm. The aerosol-generating article 10 comprises a mouth piece filter 12 at a downstream end 14. The mouth piece filter 12 has a length of between 10 mm and 12 mm. The downstream end 14 is defined by the airflow through the aerosol-generating article 10 as indicated by the arrow 16 near the downstream end 14. Air flows into the aerosol-generating article 10 at an upstream end 18 and flows out of the aerosol-generating article 10 at the downstream end 14. At the downstream end 14, a user U may inhale the aerosol.

The mouthpiece further comprises a crushable flavor capsule 20. The crushable flavor capsule 20 has a diameter of between 3.2 mm and 3.5 mm. The center of the capsule is distanced 6 mm from the downstream end 14. Preferably for the case of the capsule having a diameter of 3.5 mm, crushable flavor capsule 20 has a weight of 22.8 milligrams and a resistance to breaking of 15 N as well as an elastic deformation before breaking of 1 mm. The crushable flavor capsule 20 is arranged nestled inside of the mouth piece filter 12. Preferably, the crushable flavor capsule 20 is arranged inside a cavity 22 of the mouthpiece further. 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.

Upstream of the mouth piece filter 12, a cooling element 24 is arranged. The cooling element 24 is arranged abutting the mouth piece filter 12. The cooling element 24 is arranged in direct contact with the mouth piece filter 12. The cooling element 24 has a length of between 16 mm and 21 mm. The cooling element 24 is hollow. The cooling element 24 comprises a sidewall made of cardboard. The sidewall made of cardboard forms a cardboard tube. The cooling element 24 has essentially no resistance to draw.

The cooling element 24 comprises perforations in the periphery of the cooling element 24 to allow ambient air being drawn into the cooling element 24. This ambient air mixes with the hot air being drawn through the elements of the aerosol-generating article 10 upstream of the cooling element 24 (described in the following). The mixing of the ambient air with the hot air enables cooling down of the air and thereby formation of an aerosol due to condensation of small droplets of vaporized aerosol-forming substrate contained in the hot air. Around 10 perforations are arranged in the periphery of the cooling element 24. The perforations lead to a ventilation ratio of 40%. The ventilation ratio is the ratio of ambient air being drawn into the cooling element 24 to air being drawn through the aerosol-generating article 10 upstream of the cooling element 24. The perforations are arranged 16 mm distanced from the downstream end 14 of the aerosol-generating article 10. Upstream of the cooling element 24, a substrate portion 26 is arranged. The substrate portion 26 comprises aerosol-forming substrate. The aerosol-forming substrate comprises cut filler and an aerosol former in the form of 18 wt% glycerin. The substrate portion 26 has a length of 12 mm. The aerosol-forming substrate has a bulk density of 0.32mg/mm³ and a resistance to draw of 30 mmWG.

Upstream of the substrate portion 26, a front plug 28 made of cellulose acetate is provided. The front plug 28 has a length of 5 mm.

The total length of the aerosol-generating article 10 is 45 mm. The diameter of the aerosol-generating article 10 throughout the aerosol-generating article 10 7.3 mm. The total resistance to draw of the aerosol-generating article 10 is 44 mmWG.

Claims

1 . An aerosol-generating article comprising: a mouth piece filter at a proximal end of the aerosol-generating article, and a cooling element upstream of the mouth piece filter, wherein the cooling element is hollow and has a length of between 14 mm and 21 mm, wherein the mouth piece filter comprises a cavity, wherein a crushable flavor capsule is arranged in the cavity, wherein the mouth piece filter has a length of between 9 mm and 13 mm, wherein the mouth piece filter comprises a filter wrapper wrapped around cellulosic filtration material of the mouthpiece filter, and wherein the filter wrapper comprises a coating or anti-staining properties.

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

3. The aerosol-generating article according to any of the preceding claims, wherein the cellulosic filtration material is free of cellulose acetate.

4. The aerosol-generating article according to any of the preceding claims, wherein the cellulosic filtration material comprises a paper material, preferably wherein the cellulosic filtration material comprises a nonwoven paper material.

5. The aerosol-generating article according to any of the preceding claims, wherein the cellulosic filtration material comprises an additive, preferably wherein the additive is a phenol scavenger, more preferably wherein the additive comprises triethyl citrate, preferably liquid triethyl citrate.

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

7. The aerosol-generating article according to any of the preceding claims, wherein the coating comprises cellulose derivatives, preferably one or more of ethyl cellulose, microfibrillated cellulose and carboxymethyl cellulose.

8. The aerosol-generating article according to any of the preceding claims, wherein the coating comprises fluorinated coatings.

9. The aerosol-generating article according to any of the preceding claims, wherein the coating comprises one or more of: an acrylate, a styrene, a butadiene, a starch, a starch derivative, a cellulose derivative, an alginate, a polyvinyl alcohol, a polyvinyl acetate, polyfluoroalkyl, a gelatin, bio-wax and a gum.

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

11. The aerosol-generating article according to any of the preceding claims, wherein the length of the cooling element is between 16 mm and 18 mm.

12. The aerosol-generating article according to any of the preceding claims, wherein the length of the mouth piece filter is between 10 mm and 12 mm.

13. The aerosol-generating article according to any of the preceding claims, wherein the cooling element has a sidewall made of cardboard.

14. The aerosol-generating article according to any of the preceding claims, wherein a resistance to draw of the aerosol-generating article is between 36 mmWG and 52 mmWG, preferably between 40 mmWG and 48 mmWG, more preferably 44 mmWG.

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

16. The aerosol-generating article according to claim 15, wherein the aerosolforming substrate comprises cut filler, preferably wherein the aerosol-forming substrate comprises between 16 wt% and 20 wt% aerosol former, preferably between 17 wt% and 19 wt% aerosol former, more preferably 18 wt% aerosol former.

17. The aerosol-generating article according to claim 15 or 16, wherein the aerosol-forming substrate has a bulk density of between 0.28 mg/mm³ and 0.36 mg/mm³, preferably of between 0.30 mg/mm³ and 0.34 mg/mm³, more preferably of 0.32 mg/mm³.

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

19. The aerosol-generating article according to any of the preceding claims, wherein perforations are provided in a sidewall of the cooling element enabling ambient air to be drawn into the cooling element, preferably wherein the perforations enable a ventilation rate of between 30% and 50%, preferably between 35% and 45%, more preferably of 40%.

20. The aerosol-generating article according to any of the preceding claims, wherein the crushable flavor capsule has a diameter of between 3.0 mm and 3.7 mm, preferably between 3.2 mm and 3.5 mm.

21. The aerosol-generating article according to any of the preceding claims, wherein the crushable flavor capsule is arranged at a distance of between 4 mm and 8 mm, preferably at a distance or between 5 mm and 7 mm, more preferably at a distance of 6 mm, from a downstream end of the mouth piece filter.

22. The aerosol-generating article according to any of the preceding claims, wherein the crushable flavor capsule has a resistance to breaking of between 10 N and 20 N, preferably of between 13 N and 17 N, most preferably of 15 N.

23. The aerosol-generating article according to any of the preceding claims, wherein the crushable flavor capsule has an elastic deformation before breaking of between 0.7 mm and 1 .3 mm, preferably between 0.8 mm and 1 .2 mm, more preferably of 1 mm.

24. An aerosol-generating system comprising an aerosol-generating article according to any of the preceding claims and an aerosol-generating device having a cavity for receiving the aerosol-generating article.