Patent Description:
The aerosol generating device according to the invention is configured to operate with a consumable article comprising for example a solid substrate, also known as aerosol forming substrate, able to form aerosol when being heated. Thus, such type of aerosol generating devices, also known as heat-not-burn devices, is adapted to heat, rather than burn, the substrate by conduction, convection and/or radiation, to generate aerosol for inhalation.

The popularity and use of reduced-risk or modified-risk devices (also known as vaporisers) has grown rapidly in the past few years as an aid to assist habitual smokers wishing to quit smoking traditional tobacco products such as cigarettes, cigars, cigarillos, and rolling tobacco. Various devices and systems are available that heat or warm vaporizable substances as opposed to burning tobacco in conventional tobacco products.

Some examples of known aerosol generating devices are disclosed in <CIT>, <CIT>, <CIT> and <CIT>.

A commonly available reduced-risk or modified-risk device is the heated substrate aerosol generation device or heat-not-burn device. Devices of this type generate aerosol or vapour by heating an aerosol substrate that typically comprises moist leaf tobacco or other suitable vaporizable material to a temperature typically in the range <NUM> to <NUM>. Heating an aerosol substrate, but not combusting or burning it, releases aerosol that comprises the components sought by the user but not the toxic and carcinogenic byproducts of combustion and burning. Furthermore, the aerosol produced by heating the tobacco or other vaporizable material does not typically comprise the burnt or bitter taste resulting from combustion and burning that can be unpleasant for the user and so the substrate does not therefore require the sugars and other additives that are typically added to such materials to make the smoke and/or vapour more palatable for the user.

In order to be able to form aerosol while heating an aerosol forming substrate, the aerosol forming devices define generally a heating chamber designed to receive and heat the aerosol forming substrate. The difficulty while using such way of heating consists in a low thermal conductivity of the substrate. This results in long heating time, low energy efficiency, and a bulky device design.

It was observed that the problem of low thermal conductivity of the substrate is mainly due to a large amount of air trapped in it. Thus, this problem can be at least partially solved by compressing the aerosol forming substrate by suitable compressing means so that the most of the trapped air is removed. However, the compressing means known in the art can impose numerous constrains while using the aerosol generating device. Particularly, in some cases, insertion and/or extraction to/from the device of the consumable article can be rendered laborious by the compressing means. In some other cases, the compressing means require a manual mechanical action which cannot be always performed by the user with the required effort. In some other cases, the compressing means may require an electrical supply that increases battery consumption and render more complex the internal electrical circuitry of the device.

One of the aims of the invention is to provide an aerosol generating device allowing compressing of an aerosol forming substrate without imposing additional constrains to the device.

For this purpose, the invention relates to an aerosol generating device configured to operate with a consumable article, comprising:.

Using of an expandable container containing a heat expandable material makes it possible to compress "automatically" the aerosol forming substrate of the consumable article while its heating. It means that no additional action is required from the user and no battery power is needed to perform the compression. Particularly, the nature of the expandable material and/or the dimensions and/or the arrangement of the expandable material can be chosen so as to ensure an optimal compression rate of the substrate while it is being heated. Additionally, the compression rate may be correlated to the temperature of the aerosol forming substrate. For example, when the substrate is not being heated, the compression rate may be substantially equal to zero, whereas when the substrate is heated to its maximal temperature, the compression rate may also achieve its maximal value.

According to some embodiments, the heat expandable material is sealed inside the expandable container.

Thanks to these features, the heat expandable material can be completely isolated from the aerosol forming substrate and the aerosol formed during the heating. This prevents any deterioration of the aerosol taste or other properties while heating the substrate and the heat expandable material.

According to some embodiments, the heat expandable material is an alkane.

According to some embodiments, the heat expandable material is a paraffin wax.

Thanks to these features, the heat expandable material presents a good expansion rate at the right temperature range (during for example the pre-heating phase) and is low cost. Additionally, it is a food grade material and sustains peak temperatures of the heater.

According to some embodiments, the heat expandable material is chosen to expand during a pre-heating phase of operation of the heating chamber.

Thanks to these features, the maximal compression rate can be achieved when the aerosol generating device is ready to be used.

According to some embodiments, the moveable element forms an actuator configured to extend from a wall of the heating chamber.

Thanks to these features, the compression can be achieved using an element independent from the walls of the heating chamber.

According to some embodiments, the moveable element forms a wall of the heating chamber connected to an actuator.

Thanks to these features, it is possible to achieve a compression extending along substantially the whole surface of the aerosol generating substrate that ensures the optimal aerosol generation.

According to some embodiments, said actuator is configured to slide in a cavity further to expansion of the expandable container.

Thanks to these features, the expansion effort of the expandable container can be fully transmitted into a concentrated effort along a unique direction.

According to some embodiments, the moveable element is formed by a wall of the expandable container.

Thanks to these features, it is possible to achieve a compression extending along substantially the whole surface of the aerosol generating substrate that ensures the optimal aerosol generation. Additionally, in this case, a better compression can be achieved since the shape of the wall of the expandable container can follow precisely the external shape of the consumable article.

According to some embodiments, the moveable element forms a wall of the heating chamber in contact with a wall of the expandable container.

Thanks to these features, the expansion effort from the container can be fully transmitted to the whole wall of the heating chamber.

According to some embodiments, the expandable container forms a thermal insulator between the heating chamber and an external surface of the device.

Thanks to these features, the expandable container acts additionally as an insulator which makes it possible to insulate the heating chamber from the external surface of the aerosol generating device.

According to some embodiments, the expandable container defines at least one elastic wall or membrane able to change its shape depending on an expansion rate of the heat expending material.

Thanks to these features, it is possible to achieve a better compression by adapting the shape of the expandable container to the corresponding contact surface.

According to some embodiments, the heating chamber extends along a chamber axis between a closed end and an open end, the open end defining an opening extending perpendicularly to the chamber axis;
the moveable element being moveable substantially perpendicularly to the chamber axis.

Thanks to these features, it is possible to achieve a better compression for consumable articles presenting an elongated shape.

According to some embodiments, the heating chamber further comprises at least one heating element, said heating element forming a heating blade arranged inside the heating chamber or one or several heating resistances integrated in the movable element or a coil arranged around the heating chamber.

Thanks to these features, various types of heaters can be used to heat the aerosol forming substrate.

According to some embodiments, the heating chamber defines at least two moveable elements facing each other.

Thanks to these features, the aerosol forming substrate can be compressed in several portions to increase aerosol generating performances.

As used herein, the term "aerosol generating device" or "device" may include a vaping device to deliver an aerosol to a user, including an aerosol for vaping, by means of a heater element explained in further detail below. The device may be portable. "Portable" may refer to the device being for use when held by a user. The device may be adapted to generate a variable amount of aerosol, e.g. by activating the heater element for a variable amount of time (as opposed to a metered dose of aerosol), which can be controlled by a trigger. The trigger may be user activated, such as a vaping button and/or inhalation sensor. The inhalation sensor may be sensitive to the strength of inhalation as well as the duration of inhalation to enable a variable amount of vapour to be provided (so as to mimic the effect of smoking a conventional combustible smoking article such as a cigarette, cigar or pipe, etc.). The device may include a temperature regulation control to drive the temperature of the heater and/or the heated aerosol generating substance (aerosol pre-cursor) to a specified target temperature and thereafter to maintain the temperature at the target temperature that enables efficient generation of aerosol.

As used herein, the term "aerosol forming substrate" or "substrate" may refer to a material which may for example comprise nicotine or tobacco or any other smokable material, and an aerosol former. Tobacco may take the form of various materials such as shredded tobacco, granulated tobacco, tobacco leaf and/or reconstituted tobacco. Suitable aerosol formers include: a polyol such as sorbitol, glycerol, and glycols like propylene glycol or triethylene glycol; a non-polyol such as monohydric alcohols, acids such as lactic acid, glycerol derivatives, esters such as triacetin, triethylene glycol diacetate, triethyl citrate, glycerin or vegetable glycerin. In some embodiments, the aerosol former may be glycerol, propylene glycol, or a mixture of glycerol and propylene glycol. The substrate may also comprise at least one of a gelling agent, a binding agent, a stabilizing agent, and a humectant.

As used herein, the term "aerosol" may include a suspension of aerosol forming substrate as one or more of: solid particles; liquid droplets; gas. Said suspension may be in a gas including air. Aerosol herein may generally refer to/include a vapour. Aerosol may include one or more components of the aerosol forming substrate.

As used herein, the term "heat expandable material" or "expandable material" may refer to any material able to increase its volume while being heated. Particularly, such a material presents an expansion rate greater than <NUM> while it is being heated within a predetermined temperature range.

By "expansion rate", it is understood the ratio between an expanded volume of the heat expandable material and a reference volume. The reference volume may correspond to the volume of the heat expandable material under ambient temperature. Said predetermined temperature range corresponds substantially to the heating temperature range of the aerosol forming precursor and may extend from a first value corresponding substantially to the ambient temperature until a second value corresponding to the maximal heating temperature of the aerosol forming substrate. The second value can thus be comprised in the interval extending from <NUM> until <NUM>, preferably from <NUM> until <NUM>. Within said predetermined temperature range, the expansion can increase following a complex curve which depends for example on geometrical factors. Typically, it can have an "S" shape comprising three increasing segments: initial segment with moderate expansion (inferior portion of the "S"), middle segment with the most significant expansion (ascending portion of the "S") and final segment with moderate expansion (superior portion of the "S"). The middle segment can be defined between the maximum ambient temperature, e.g. <NUM>, and the minimal temperature of the device's heater during the vaping session, e.g. <NUM>. According to some embodiments, the first two segments can correspond to a pre-heating phase of the aerosol forming substrate. Depending on the nature of the expandable material, the middle segment can further comprise a phase change point, such a melting point. Typically, the melting point can be about <NUM> -<NUM>.

As used herein, the term "preheating phase", it is understood an initial phase of operation of the aerosol generating device which is necessary to heat the aerosol forming substrate to be able to generate aerosol. Particularly, during the preheating phase, the aerosol forming device is configured to heat the aerosol forming substrate from the ambient temperature until a temperature allowing aerosol generation. This last temperature may be comprised in the interval extending from <NUM> until <NUM>, preferably from <NUM> until <NUM>. After the preheating phase, the aerosol generating device can be adapted to heat the aerosol forming substrate to maintain for example a constant temperature of the substrate or to follow a predetermined temperature profile.

As used herein, the term "alkane" or "paraffin" or "acyclic saturated hydrocarbons" may refer to a material mainly comprising chemical elements consisting of hydrogen and carbon atoms arranged in a structure, for example a linear periodical srtucture, in which all the carbon-carbon bonds are single. Said chemical elements have the general chemical formula CnH2n+<NUM>.

As used herein, the term "paraffin wax", "petroleum wax" or "wax" may refer to a material mainly comprising a mixture of hydrocarbon molecules containing between twenty and forty carbon atoms. According to the preferred embodiment, such a mixture comprises <NUM> carbon atoms and has thus the general chemical formula C<NUM>H<NUM>.

An aerosol generating device <NUM> according to the first embodiment of the invention is shown on <FIG> and <FIG>. This aerosol generating device <NUM> is designed to operate with a consumable article <NUM> also shown on these figures.

Particularly, as it is shown on <FIG>, the consumable article <NUM> comprises a substrate portion <NUM> and a filter portion <NUM>. Both portions <NUM>, <NUM> can be wrapped using a unique wrapper attaching these portions together. In other examples, the portions <NUM>, <NUM> may be wrapped by different wrappers and fixed one to the other by any other suitable mean. The or each wrapper may, for example, comprise paper and/or non-woven fabric and/or aluminium. The or each wrapper may be porous or air impermeable. The consumable article <NUM> can have a generally tubular shape defining for example a circular cross-section. According to another example, the consumable article <NUM> defines a rectangular cross-section.

The substrate portion <NUM> contains an aerosol forming substrate intended to be heated by a heating chamber of the aerosol generating device <NUM> as it will be explained in further detail below. Additionally, according to some examples, the substrate portion <NUM> may comprise one or several susceptors integrated into the aerosol forming substrate. The susceptors may be formed from electrical conductor materials able to generate eddy currents when placed within a magnetic field. Eddy currents cause the susceptors to generate heat suitable for heating the aerosol forming substrate to generate aerosol. The magnetic field can be generated by a coil comprised in a heating system of the aerosol generating device <NUM>. The substrate portion <NUM> may comprise two or more adjacent segments with at least an upstream segment containing an aerosol forming substrate and a downstream segment forming spacer or cooling segment. The downstream segment can be a tube, for example, made of paper or other rigid material such as PLA material. The tube may be hollow or partially filled or reinforced by internal, e.g. radial and/or longitudinal, walls.

The filter portion <NUM> comprises a core acting for example like a filter. The core may for example be a foam, or packed strands or fibres. In some examples, the filter portion <NUM> can form a mouthpiece intended to be in contact with the user's lips and/or mouth while using the device <NUM>. In some other examples, the filter portion <NUM> can be inserted into a separate mouthpiece intended to be in contact with the user's lips and/or mouth. According to some other examples, the consumable article <NUM> can comprise only the substrate portion <NUM>.

The aerosol generating device <NUM> comprises a housing <NUM> defining an insertion opening <NUM> suitable for insertion of the consumable article <NUM>. The housing <NUM> delimits an internal space of the device <NUM> receiving various elements designed to carry out different functionalities of the device <NUM>. This internal space can for example receive a battery <NUM> for powering the device <NUM>, a control module <NUM> for controlling the operation of the device <NUM>, a heating chamber <NUM> configured to receive and heat at least a part of the consumable article <NUM>, and an expendable container <NUM> configured to cause compression of the consumable article <NUM> when it is partially received in the heating chamber <NUM>. Among these elements, only the heating chamber <NUM> and the expendable container <NUM> will be explained in further detail. The other elements, as for example the battery <NUM> and the control module <NUM>, can be implemented using known techniques.

The heating chamber <NUM> extends along a chamber axis X between a closed end <NUM> and an open end <NUM>, and has substantially the same cross-sectional shape as the consumable article <NUM>. The open end <NUM> opens to the insertion opening <NUM> of the housing <NUM>. As it is shown on <FIG>, the heating chamber <NUM> is adapted to receive the substrate portion <NUM> of the consumable article <NUM> through the open end <NUM> so as this substrate portion <NUM> extends inside the heating chamber along the chamber axis X. Additionally, as mentioned above, the heating chamber <NUM> is adapted to heat at least a part of the substrate portion <NUM>.

For this purpose, the heating chamber <NUM> comprises a heating element <NUM> which is formed in the example of <FIG> by a heating blade. Such a heating blade is configured to penetrate inside the substrate portion <NUM> of the consumable article <NUM> while its insertion. The operation of the heating element <NUM> may be controlled by the control module <NUM> using control methods known per se. According to another example, the heating element <NUM> is formed by a coil arranged around the heating chamber <NUM> and able to create a magnetic field inside the chamber <NUM> which is controlled by the control module <NUM>. In this case, the substrate portion <NUM> of the consumable article <NUM> includes one or several susceptors explained above. According to still another example, the heating chamber <NUM> may comprise one or several heating elements <NUM> formed by heating resistances integrated into at least one wall of the heating chamber <NUM> and designed to be in contact with the substrate portion <NUM>. As in the previous examples, the operation of these heating elements <NUM> is controlled by the control module <NUM>.

The heating chamber <NUM> further comprises at least one moveable element configured to compress at least a part of the substrate portion <NUM> of the consumable article <NUM> when the chamber <NUM> heats this portion <NUM>. Particularly, the moveable element is configured to exert force on said part of the substrate portion <NUM> according to at least a transversal axis Y perpendicular to the chamber axis X.

According to the first embodiment of the invention, the moveable element is formed by at least one wall of the heating chamber <NUM> which is formed by at least one wall of the expandable container <NUM>. Particularly, according to the first embodiment of the invention, the moveable part of the heating chamber <NUM> is formed by a wall <NUM> of the expandable container <NUM>, referenced hereinafter as a compressing wall <NUM>. This compressing wall <NUM> is intended to be in contact with the substrate portion <NUM> of the consumable article <NUM> when it is inserted into the heating chamber <NUM>.

Additionally, according to the example of the first embodiment shown on <FIG> and <FIG>, the expandable container <NUM> forms a cylindrical shape extending along the chamber axis X and defining a through hole delimited by an internal wall forming the compressing wall <NUM>. In other words, this compressing wall <NUM> forms a lateral wall delimiting laterally, i.e. along the chamber axis X, the heating chamber <NUM>. Thus, according to this example, the compressing wall <NUM> is intended to be in a circumferential contact with the substrate portion <NUM> of the consumable article <NUM> and consequently, compress circumferentially this portion <NUM> when being heated.

According to other examples of the first embodiment of the invention, the expandable container <NUM> has any other suitable shape defining at least one wall forming at least partially a lateral wall of the heating chamber <NUM>. In other words, according to these examples, the expandable container <NUM> can have any suitable shape defining at least a wall designed to be in contact with at least a part of the substrate portion <NUM> of the consumable article <NUM> when it is received in the heating chamber <NUM>. For example, the expendable container <NUM> can form a half-cylindrical shape designed to extend partially around the substrate portion <NUM>.

The expandable container <NUM> is filled with a heat expandable material which can be an alkane and preferably paraffin wax. Under the ambient temperature, i.e. under the temperature comprised for example between <NUM> and <NUM>, the volume of the heat expandable material is for example <NUM> or <NUM> times greater than the desired volume change induced by the compression of the aerosol forming substrate of the substrate portion <NUM> and notably, of the upstream segment of the substrate portion <NUM> in the case where an upstream segment and a downstream segment are defined as explained above. In a general case, the amount of the heat expandable material, its nature and the geometry of the expandable container <NUM> are chosen so as to ensure an optimal expansion rate of the expandable container <NUM> (or an optimal compression rate of the heat substrate portion <NUM>) in a predetermined temperature range. As mentioned above, the predetermined temperature range corresponds substantially to the heating temperature range of the aerosol forming precursor and may extend from a first value corresponding substantially to the ambient temperature until a second value corresponding to the maximal heating temperature of the aerosol forming substrate. The second value can thus be comprised in the interval extending from <NUM> until <NUM>, preferably from <NUM> until <NUM>. Moreover, said temperature range can comprise a segment corresponding to a pre-heating phase of the aerosol generating substrate. For example, in case of using of paraffin wax, its melting point and the most significant expansion can be comprised in the interval from <NUM> to <NUM>. This interval is comprised in the pre-heating phase of the substrate <NUM> so as when the user starts the vaping session, the expandable container <NUM> can ensure the optimal compression rate of the substrate <NUM>. When the user finishes the vaping session, the expandable material is cooled down and the expandable container <NUM> can take it initial shape an release the substrate portion <NUM>.

The optimal compression rate of the heat substrate portion <NUM> is determined according to the nature of the aerosol forming substrate comprised therein ant notably, according to the volume of air trapped in the aerosol forming substrate. The optimal compression rate ensures for example the optimal aerosol generation and can for example be determined empirically.

The compressing wall <NUM> of the expandable container <NUM> is able to expand with expanding of the heat expandable material according to the transversal axis Y as it is shown on <FIG>. Thus, the compressing wall <NUM> is able to compress the substrate portion <NUM> of the consumable article <NUM> along substantially the whole contact area with the compressing wall <NUM>. According to another example, the compressing wall <NUM> is configured to compress only a part of the substrate portion <NUM>. For example, when the substrate portion <NUM> comprises an upstream segment and a downstream segment, the compressing wall <NUM> is configured to compress only the upstream segment of the compressing wall <NUM>. In this case, the compressing wall <NUM> can extend only face to the upstream segment or define an elastic part facing this upstream segment.

The compressing wall <NUM> is made at least partially of a flexible material, preferably an elastic material. Particularly, the compressing wall <NUM> can be made of typical food-grade, elastic, and high-temperature resistant rubbers as silicone or fluorocarbons. In some examples, the compressing wall <NUM> is the only wall of the expandable container <NUM> made of an elastic material and the other walls of the expandable material <NUM> are rigid. According to some other examples, all of the walls of the expandable container <NUM> are made of an elastic material. In this last case, the expansion of other walls of the expandable container <NUM> can be limited/constrained by the mechanical structure of the device <NUM> and notably by the mechanical structure of the housing <NUM>.

According to some examples of the first embodiment of the invention (not shown), the compressing wall <NUM> can comprise one or several flexible heating resistances able to heat the substrate portion <NUM>. Particularly, in this case, the heating resistances can be integrated in the compressing wall <NUM> while its manufacturing. For example, the heating elements can be embedded in the elastic material of the compressing wall <NUM>, for example by overmoulding.

Advantageously, according to the invention, the expandable container <NUM> is sealed. The sealing can be performed during the manufacturing of the device <NUM> before insertion of the expandable container <NUM> inside the housing <NUM> or after. Particularly, in the first case, the heat expandable material can be first introduced into the expandable container <NUM>, the expandable container <NUM> can be then sealed and inserted inside the housing <NUM>. In the second case, the expandable container <NUM> can be first inserted inside the housing <NUM> and then be filled with the heat expandable material and sealed.

An aerosol generating device <NUM> according to the second embodiment of the invention is shown on <FIG> and <FIG>. This aerosol generating device <NUM> is designed to operate with the same consumable article <NUM> explained in relation with the previous embodiment.

Additionally, as in the previous case, the aerosol generating device <NUM> comprises a housing <NUM> defining an insertion opening <NUM> suitable for insertion of the consumable article <NUM> and comprising notably a battery <NUM>, a control module <NUM>, a heating chamber <NUM> and an expandable container <NUM>. The battery <NUM> and the control module <NUM> are similar to the battery <NUM> and the control module <NUM> explained above. Moreover, as in the previous case, the heating chamber <NUM> is configured to receive and heat at least a part of the consumable article <NUM> and extends along a chamber axis X between a closed end <NUM> and an open end <NUM>. The heating chamber <NUM> comprises a heating element <NUM> and at least one moveable element configured to compress at least a part of the substrate portion <NUM> of the consumable article <NUM> when the chamber <NUM> heats this portion <NUM>. Finally, as in the previous case, the heating element <NUM> may also be formed for example by a heating blade (as shown on <FIG> and <FIG>) or by a coil or by one or several heating resistances integrated into at least one wall of the heating chamber <NUM>.

Contrary to the previous case, according to the second embodiment of the invention, the or each moveable element of the heating chamber <NUM> is formed by a slidable wall of this heating chamber <NUM> in contact with the expandable container <NUM>. Particularly, in the example of <FIG> and <FIG>, the heating chamber <NUM> comprises two moveable elements formed by its opposite slidable walls 140A, 140B, each slidable wall 140A, 140B being in contact with the expandable container <NUM>. This configuration can be notably used when the heating chamber <NUM> and the consumable article <NUM> have a rectangular cross-section. According to other examples of this embodiment, the number of slidable walls can be greater than <NUM>. Each of the slidable walls can be in contact with the expandable container and is configured to compress at least a part of the substrate portion <NUM> further to expansion of the expandable container <NUM>.

According to the example of <FIG> and <FIG>, each slidable wall 140A, 140B is slidable along the transversal axis Y while expansion of the expendable container <NUM>. Particularly, according to this example, each slidable wall 140A, 140B defines an internal surface delimiting partially the heating chamber <NUM> and intended to be in contact with at least a part of the substrate portion <NUM>, and an external surface in contact with at least one wall of the expandable container <NUM>. For example, when the substrate portion <NUM> comprises an upstream segment and a downstream segment, each slidable wall 140A, 140B can be configured to be in contact only with the upstream segment. Additionally, each slidable wall 140A, 140B can be mounted on guiding means (not shown) allowing sliding of this wall along the transversal axis Y between a first position (shown on <FIG>) wherein the substrate portion <NUM> can be received in the heating chamber <NUM> and extracted therefrom, and a second position (shown on <FIG>) wherein this portion <NUM> is compressed between the slidable walls 140A, 140B. Thus, in the example of these figures, the walls 140A, 140B are slidable in opposite directions.

Each slidable wall 140A, 140B is configured to slide from the first position to the second position with expansion of the expandable container <NUM>. Additionally, in some examples, the housing <NUM> may comprise biasing means configured to cause each slidable wall 140A, 140B to return from the second position to the first position when the expandable container <NUM> is not expanded. According to some other examples, each slidable wall 140A, 140B is configured to return from the second position to the first position when the user extracts the consumable article <NUM> from the device <NUM>.

As in the previous embodiment, according to some examples of the second embodiment, one or several heating resistances can be integrated into the walls 140A, 140B to heat the aerosol forming substrate.

The expandable container <NUM> may be similar to the expandable container <NUM> explained above. Particularly, as in the previous case, the expandable container <NUM> contains a heat expandable material causing the container expansion while being heated. For this purpose, the expandable container <NUM> defines at least one elastic wall able to cause sliding of the slidable walls 140A, 140B into their second position. According to the second embodiment of the invention, the expandable container <NUM> is arranged in a cavity between the heating chamber <NUM> and an internal surface of the housing <NUM>.

Like in the previous embodiment, the expandable container <NUM> can present a cylindrical shape with a through hole making it possible its arrangement around the heating chamber <NUM>. According to another example, the expandable container <NUM> can form two independent parts, each part being arranged between the internal surface of the housing <NUM> and the corresponding wall 140A, 140B of the heating chamber <NUM>. According to this example, each part of the expandable container <NUM> can acts independently on the corresponding sliding wall 140A, 140B. Finally, as in the previous embodiment, the amount of the heat expandable material, its nature and the geometry of the expandable container <NUM> are chosen so as to ensure an optimal expansion rate of the expandable container <NUM> (or an optimal compression rate of the heat substrate portion <NUM>).

An aerosol generating device <NUM> according to the third embodiment of the invention is shown on <FIG> and <FIG>. As in the previous cases, this aerosol generating device <NUM> is designed to operate with the same consumable article <NUM> which will not be explained in further detail in relation with this embodiment.

Additionally, as in the previous cases, the aerosol generating device <NUM> comprises a housing <NUM> defining an insertion opening <NUM> suitable for insertion of the consumable article <NUM> and comprising notably a battery <NUM>, a control module <NUM>, a heating chamber <NUM> and an expandable container <NUM>. The battery <NUM> and the control module <NUM> are similar to the battery <NUM> and the control module <NUM> explained above. Moreover, as in the previous cases, the heating chamber <NUM> is configured to receive and heat at least a part of the consumable article <NUM> and extends along a chamber axis X between a closed end <NUM> and an open end <NUM>.

Contrary to the previous cases, the heating chamber <NUM> may define one or more fixed lateral walls <NUM> extending along the chamber axis X and intended to be in contact with the substrate portion <NUM> of the consumable article <NUM> when it is received inside the heating chamber <NUM>. In this case, the heating chamber <NUM> may form a cup-shaped heating chamber <NUM> and comprise a heating element <NUM> formed by one or several heating resistances integrated into its lateral walls, as it is shown in the examples of <FIG> and <FIG>. According to other examples, the heating element <NUM> can be formed by a heating blade explained in relation with the previous embodiments or a coil arranged around the heating chamber <NUM>.

According to the third embodiment of the invention, the heating chamber <NUM> comprises at least one moveable element forming an actuator <NUM> configured to protrude from the lateral wall <NUM> of the heating chamber <NUM> to compress the substrate portion <NUM> of the consumable article <NUM>. Particularly, the actuator <NUM> is connected to the expandable container <NUM> and is configured to protrude from the lateral wall <NUM> with expansion of the expandable container <NUM>. In some examples of this embodiment, the heating chamber <NUM> may comprise several moveable elements extending from one or more lateral walls. For example, when the heating chamber <NUM> forms a circular tube, the moveable elements can form radial ribs extending from the lateral wall of the chamber <NUM> to compress at least a part of the substrate portion <NUM>.

In the example of <FIG> and <FIG>, the actuator <NUM> comprises a compressing part <NUM> configured to protrude from the wall <NUM> according to the transversal axis Y and a guiding part <NUM> connecting the compressing part <NUM> with the expandable container <NUM> and guiding the compressing part <NUM> according to the transversal axis Y during the expansion of the expandable container <NUM>. The guiding part <NUM> may be arranged in a cavity extending along the transversal axis Y. Thus, while expansion of the expandable container <NUM>, the guiding part <NUM> is able to guide the compressing part <NUM> from a first position (shown on <FIG>) wherein the substrate portion <NUM> is not compressed to a second position (shown on <FIG>) wherein the substrate portion <NUM> is compressed. Similarly to the second embodiment of the invention, according to some examples of the third embodiment, biasing means can be used to push the compressing part <NUM> of the actuator <NUM> from the second position to the first position when the expandable container <NUM> is not expanded.

As in the previous embodiments, the expandable container <NUM> is filled with an expandable material. The internal volume of the expandable container <NUM> can be delimited by rigid walls defining an opening sealed with an expandable membrane <NUM>. The expandable membrane <NUM> can be connected directly or indirectly to the guiding part <NUM> of the actuator <NUM> to cause its sliding into the cavity along the transversal axis Y. Thus, as it is shown on <FIG>, the expandable membrane <NUM> can expand into the cavity containing the guiding part <NUM> of the actuator with expansion of the heat expanding material contained in the container <NUM>. Finally, as in the previous embodiments, the amount of the heat expandable material, its nature and the geometry of the expandable container <NUM> are chosen so as to ensure an optimal expansion rate of the expandable container <NUM> (or an optimal compression rate of the heat substrate portion <NUM>).

Other examples of the expandable container <NUM> are also possible. For example, in case of a plurality moveable elements forming radial ribs, the expandable container <NUM> can form a unique cylindrical piece arranged around the heating chamber <NUM> as it was explained in relation with the first embodiment of the invention. Thus, an expansion of the expandable container <NUM> can cause protruding of each moveable element from the lateral wall.

An aerosol generating device <NUM> according to the fourth embodiment of the invention is shown on <FIG> and <FIG>. As in the previous cases, this aerosol generating device <NUM> is designed to operate with the same consumable article <NUM> which will not be explained in further detail in relation with this embodiment.

Additionally, as in the previous cases, the aerosol generating device <NUM> comprises a housing <NUM> defining an insertion opening <NUM> suitable for insertion of the consumable article <NUM> and comprising notably a battery <NUM>, a control module <NUM>, a heating chamber <NUM> and an expandable container <NUM>. The battery <NUM> and the control module <NUM> are similar to the battery <NUM> and the control module <NUM> explained above. Moreover, as in the previous cases, the heating chamber <NUM> is configured to receive and heat at least a part of the consumable article <NUM> and extends along a chamber axis X between a closed end <NUM> and an open end <NUM>. Moreover, in the examples of <FIG> and <FIG>, the heating chamber <NUM> comprises a heating element <NUM> formed by a heating blade similar to the heating blade explained above. According to other examples, the heating element <NUM> may be formed by one or several heating resistances integrated into walls of the heating chamber <NUM> or a coil arranged around the heating chamber <NUM>.

According to the fourth embodiment of the invention, the heating chamber <NUM> comprises at least one movable element formed by a slidable wall <NUM> of the chamber <NUM> connected to an actuator <NUM>. The slidable wall <NUM> is similar to one of the slidable walls 140A, 140B explained in relation with the second embodiment of the invention. Particularly, according to the fourth embodiment of the invention, the slidable wall <NUM> is moveable by the actuator <NUM> along the transversal axis Y from a first position (shown on <FIG>) wherein the substrate portion <NUM> is not compressed to a second position (shown on <FIG>) wherein the substrate portion <NUM> is compressed. In some embodiments, the wall <NUM> can be pushed from the second position to the first position using suitable biasing means.

The actuator <NUM> connects the slidable wall <NUM> to the expandable container <NUM> and is able to slide according to the transversal axis Y with expansion of the expandable container <NUM>. The actuator <NUM> can slide for example in a cavity formed between the slidable wall <NUM> and the container <NUM>.

The expandable container <NUM> is similar to the expandable container <NUM> explained in reference with the third embodiment of the invention. Particularly, as in the previous case, the expandable container <NUM> is filled with a heat expandable material. The internal volume of the expandable container <NUM> can be delimited by rigid walls defining an opening sealed with an expandable membrane <NUM>. The expandable membrane <NUM> can be connected directly or indirectly to the actuator <NUM> to cause its sliding along the transversal axis Y. Thus, as it is shown on <FIG>, the expandable membrane <NUM> can expand into the cavity containing the actuator <NUM> with expansion of the heat expanding material contained in the container <NUM>.

Finally, as in the previous embodiments, the amount of the heat expandable material, its nature and the geometry of the expandable container <NUM> are chosen so as to ensure an optimal expansion rate of the expandable container <NUM> (or an optimal compression rate of the heat substrate portion <NUM>).

Claim 1:
An aerosol generating device (<NUM>; <NUM>; <NUM>; <NUM>) configured to operate with a consumable article (<NUM>), comprising:
- a heating chamber (<NUM>; <NUM>; <NUM>; <NUM>) configured to receive and heat at least a part of the consumable article (<NUM>), the heating chamber (<NUM>; <NUM>; <NUM>; <NUM>) comprising at least one moveable element;
the aerosol generating device (<NUM>; <NUM>; <NUM>; <NUM>) being characterized in that it further comprises:
- an expandable container (<NUM>; <NUM>; <NUM>; <NUM>) containing a heat expandable material and configured to cause, by expansion of the heat expandable material, the moveable element to compress said part of the consumable article (<NUM>) when it is received in the heating chamber (<NUM>; <NUM>; <NUM>; <NUM>) and when the heating chamber (<NUM>; <NUM>; <NUM>; <NUM>) is operated to heat said part of the consumable article (<NUM>).