WO2023227744A1

WO2023227744A1 - Tobacco article comprising a viscous vaporizable material and associated aerosol generating device and assembling method

Info

Publication number: WO2023227744A1
Application number: PCT/EP2023/064117
Authority: WO
Inventors: Grzegorz Aleksander PILATOWICZ
Original assignee: Jt International S.A.
Priority date: 2022-05-25
Filing date: 2023-05-25
Publication date: 2023-11-30

Abstract

The present invention concerns a tobacco article (14) comprising a viscous vaporizable material (63) and a support (51), the support (51) being formed from one or several rigid sheets (61, 62) arranged or bent to retain the viscous vaporizable material (63) and to form an airflow path.

Description

Tobacco article comprising a viscous vaporizable material and associated aerosol generating device and assembling method

FIELD OF THE INVENTION

The present invention concerns a tobacco article comprising a viscous vaporizable material. The present invention also concerns an aerosol generating device and an assembling method associated to such a tobacco article.

BACKGROUND OF THE INVENTION

Different types of aerosol generating devices are already known in the art. Generally, such devices comprise a storage portion for storing a vaporizable material, also known as aerosol forming precursor, which can for example be liquid or solid or even viscous. A heating system is formed of one or more electrically activated resistive elements arranged to heat said precursor to generate the aerosol. The aerosol is released into a flow path extending between an inlet and outlet of the device. The outlet may be arranged in a mouthpiece, through which a user inhales for delivery of the aerosol.

The aerosol generating devices comprise generally a battery able to power the heating system. The powering may be controlled by a control module connecting the heating system to the battery via an electric circuit.

In some aerosol generating devices, the precursor is stored in a removable cartridge. Thus, when the precursor is consumed, the cartridge can be easily removed and replaced.

The cartridges storing a vaporizable material in a liquid form generally comprise a ceramic or cotton wick to deliver the liquid until the heating system. However, such type of wick can be clogged or even burned after a limited number of puffs. In other types of cartridges, a liquid or viscous material can be held in a metal container and heated up using resistive heating. However, in such cartridges, a significant amount of condensation is formed in the mouthpiece that requires a cleaning effort for the consumer. Additionally, a high efficiency of insulation is necessary to avoid too high temperatures of the housing for the consumers.

SUMMARY OF THE INVENTION The present invention aims to avoid these issues and proposes a tobacco article without wick which minimizes condensation in the mouthpiece and avoids overheating of the external housing.

For this purpose, the invention relates to a tobacco article comprising a viscous vaporizable material and a support, the support being formed from one or several rigid sheets arranged or bent to retain the viscous vaporizable material and to form an airflow path.

Particularly, provided with these features, using of a wick can be avoided since the viscous material can be heated directly by a resistive heater or induction to release aerosol into the airflow path. The airflow path can also avoid condensations in the mouthpiece. Additionally, since the vaporizable material can be isolated from the heating chamber by the support and since condensation can be minimized, there is no need for cleaning of the heating chamber even with intensive using.

In the meaning of the invention, the “rigid sheet” signifies that the sheet in the assembled tobacco article cannot be forced out of its shape during a normal usage of the tobacco article. In other words, the rigidity of this sheet allows forming a given shape (for example a cylindrical shape) without losing mechanical integrity and good mechanical contact with neighboring layers.

Advantageously, the viscosity of the vaporizable material is comprised between 45 000 mPa.s and 250 000 mPa.s and preferably, between 50 000 mPa.s and 130 000 mPa.s and even more preferably between 55 000 mPa.s and 100 000 mPa.s. It can for example be substantially equal to 60 000 mPa.s. It can be measured using a known viscometer, for example a Brookfield viscometer LVT. The viscosity of the vaporizable material can be chosen as a function of the tobacco content in the vaporizable material. For example, for a smaller content of the tobacco material, a higher viscosity of the vaporizable material may be needed to maintain the desired mechanical integrity.

The Young’s modulus of the vaporizable material can be comprised between 5 kPa and 30 kPa, advantageously between 7 kPa and 25 kPa. It can for example be substantially equal to 10 kPa. It can be measured a known tensile tester. In some embodiments, tobacco content in the vaporizable material can be comprised between 15% and 20%, and advantageously equal for example to 20% or 21%.

According to some embodiments, the or each rigid sheet is made of metal.

Thanks to these features, the support can be heated by an external resistive heater for example by conduction and/or convection, and transmit the received heat directly to the vaporizable material. Thus, efficiency of aerosol generation can be increased.

According to some embodiments, the or each rigid sheet is bent to form a cylindrical shape, advantageously having a circular cross-section.

The cylindrical shape is particularly advantageous since the airflow path can be formed in the center of this shape. Thus, aerosol can be formed by the vaporizable material all around the airflow path and can efficiently be conducted until the mouthpiece.

The cylindrical shape may have any appropriate cross-section. It may for example have a circular, rectangular or square cross-section.

In case of a circular cross-section, the tobacco article can have the same appearance as a conventional cigarette or a stick used with some HNB devices (heat-not-burn devices). Additionally, in some embodiments, the tobacco article can have an elongated shape and even similar dimensions as a conventional cigarette. According to other embodiments, the tobacco article can be more compact than a conventional cigarette. For example, its diameter can be comprised between 4 and 15 mm, advantageously between 5 and 10 mm. It can for example be substantially equal to 6 mm. The length of the tobacco article can also be shortened in comparison with a conventional cigarette. For example, its length can be comprised between 6 mm and 20 mm, advantageously between 10 and 15 mm. It can for example be substantially equal to 12 mm.

According to some embodiments, the tobacco article comprises an outer sheet and an inner sheet, the viscous vaporizable material being retained between said sheets.

Thanks to these features, the viscous vaporizable material can be efficiently retained between the sheets. The vaporizable material is thus sandwiched between the sheets and forms for example a thin tobacco layer. The thickness of the tobacco layer can be comprised between 0,1 and 5 mm, advantageously between 0,5 and 3 mm, and even more advantageously between 0,5 and 2 mm. Thus, the tobacco layer can be heated almost instantly, without needing a special pre-heating phase. Additionally, each rigid sheet can also form a thin layer. Its thickness can for example be comprised between 0,01 and 1 mm, advantageously between 0,05 and 0,5 mm. In some embodiments, this thickness can be substantially equal to 0,1 mm.

According to some embodiments, the inner sheet delimits the airflow path.

The airflow path is thus delimited by one of the rigid sheets and the vaporizable material can entirely surround the airflow path. Provided with these features, aerosol can be formed by the vaporizable material all around the airflow path and can efficiently be conducted until the mouthpiece.

According to some embodiments, the inner sheet is perforated.

Perforations in the inner sheet make it possible aerosol releasing from the vaporizable material directly to the airflow path. The perforations can be arranged along the inner sheet according to any suitable pattern. For example, the perforations can be homogenously distributed along the inner sheet. According to another embodiment, the perforations are mainly distributed in a predetermined portion of the inner sheet. This portion can for example form an upstream portion or a central portion or a downstream portion in respect with the airflow path. The perforations have dimensions which are advantageously comprised between 0,3 mm and 0,7 mm, and preferably substantially equal to 0,5 mm.

According to some embodiments, the tobacco article further comprises a gauze sheet interposed between the vaporizable material and the or at least one of the rigid sheets.

The gauze sheet can prevent against leakages to the exterior of the tobacco article and/or in the airflow path. In the preferred embodiment, the gauze sheet is interposed between the inner sheet and the vaporizable material. The gauze sheet can for example extend according to the whole area of the corresponding rigid sheet. The gauze sheet can also ensure a mechanical support for the vaporizable material. The gauze sheet can be made of or comprise cotton, nylon, glass fiber, cellulose, composite and/or tea bag paper. The tea bag paper may be a blend of wood and vegetable fibers. According to another embodiment, the tea bag paper is a porous element made of paper or possibly polymeric mesh.

According to some embodiments, the tobacco article further comprises an external wrapper assembling the or each rigid sheets with a filter/cooling portion.

Thanks to these features, the aerosol formed by the vaporizable material can be filtered and/or cooled by the filter/cooling portion.

According to some embodiments, the viscous vaporizable material is chosen among at least one of the following elements:

- viscous T-liquid;

- viscous E-liquid;

- tobacco dough ;

- tobacco wax.

According to some embodiments, the viscous vaporizable material comprises a solid content and a liquid content, the ratio of the solid content being comprised between 80% and 120% of the liquid content and is advantageously equal to 100% of the liquid content.

Thanks to these features, the vaporizable material can form an appropriate viscosity to be retained between the rigid sheets.

According to some embodiments, the solid content comprises ground tobacco.

Thanks to these features, aerosol formed by the vaporizable material can provide a tobacco taste. The proportions of the ground tobacco in the solid content can be comprised between 40% and 60%, and preferably substantially equal to 50%.

According to some embodiments, the liquid content comprises glycerine, preferably propylene glycol and advantageously water.

According to some embodiments:

- the ratio of glycerine is comprised between 50% and 100% of the liquid content;

- the ratio of propylene glycol is comprised between 0% and 50% of the liquid content; and - the ratio of water is comprised between 0% and 20% of the liquid content.

Thanks to these features, the vaporizable material can generate vapor while being heated. By adapting these ratios within the given intervals, the quantity of the generated vapor can be adjusted during the whole vaping session. Thus, user experience can be improved.

According to some embodiments, said outer sheet forms a unique outer sheet and said inner sheet forms a unique inner sheet of the article.

According to some embodiments, the viscous vaporizable material is in direct contact with the outer sheet.

According to some embodiment, the viscous vaporizable material forms a unique layer of vaporizable material in the article.

The invention also relates to an aerosol generating device comprising a cavity configured to receive and heat the tobacco article as defined above.

According to some embodiments, the cavity is configured to receive and heat simultaneously at least two tobacco articles, the airflow path of one of the tobacco articles extending the airflow path of the other tobacco article.

The tobacco articles can for example be stacked one on the other to form a continuous airflow path. The airflow path can for example extend through the center of the articles. In some embodiments, the articles can provide fixing means making it possible to fix articles between them. The articles can for example be assembled before being inserted in the cavity. Alternatively, the articles can be assembled by their consecutive insertion into the cavity. The fixing means can be configured to prevent aerosol leakage between the articles.

Using of several tobacco articles within a same device can be advantageous when prolonged vapor sessions are needed for the user. In some cases, several articles can be used to adjust their compatibility with different types of aerosol generating devices having different lengths of the cavities. The invention also relates to an assembling method of a tobacco article as defined above, the method comprising the following steps:

(A) applying the viscous vaporizable material on one of the rigid sheets;

(C) applying the other rigid sheet on the vaporizable material;

(D) bending the result around an article axis to form the airflow path.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention and its advantages will be better understood upon reading the following description, which is given solely by way of non-limiting example and which is made with reference to the appended drawings, in which:

- Figure 1 is a schematic view of an aerosol generating device according to a first embodiment of the invention, the aerosol generating device being configured to operate with a tobacco article according to the invention;

- Figure 2 is a schematic perspective view of the tobacco article of Figure 1 ;

- Figure 3 is a schematic view of different steps of an assembling method of the tobacco article of Figure 1 ; and

- Figure 4 is a schematic view of an aerosol generating device according to a second embodiment of the invention, the aerosol generating device being configured to operate with several tobacco articles according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

Before describing the invention, it is to be understood that it is not limited to the details of construction set forth in the following description. It will be apparent to those skilled in the art having the benefit of the present disclosure that the invention is capable of other embodiments and of being practiced or being carried out in various ways.

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 aerosol generating unit (e.g. an aerosol generating element which generates vapor which condenses into an aerosol before delivery to an outlet of the device at, for example, a mouthpiece, for inhalation by a user). 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 a heating system 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 vapor 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” may include a suspension of precursor 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 vapor. Aerosol may include one or more components of the precursor.

As used herein, the term “vaporizable material” or “aerosol-forming precursor” may refer to one or more of a: liquid; solid; gel; mousse; foam or other substances. The vaporizable material may be processable by the heating system of the device to form an aerosol as defined herein. The vaporizable material may comprise one or more of: nicotine; caffeine or other active components. The active component may be carried with a carrier, which may be a liquid. The carrier may include propylene glycol or glycerin. A flavoring may also be present. The flavoring may include Ethylvanillin (vanilla), menthol, Isoamyl acetate (banana oil) or similar. A solid aerosol forming substance may be in the form of a rod, which contains processed tobacco material, a crimped sheet or oriented strips or shreds of reconstituted tobacco (RTB). The vaporizable material can be viscous.

As used herein, the term “length” in relation with an object is used to designate the longitudinal dimension of this object measured according to an extension axis of this object.

FIRST EMBODIMENT OF THE INVENTION

Figure 1 shows an aerosol generating set 10 comprising an aerosol generating device 12 according to a first embodiment of the invention and a tobacco article 14 configured to operate with the aerosol generating device 12. The tobacco article 14 is preferably removable and can be inserted in the device 12 and extracted from the device 12 as it will be explained in further detail below.

As shown in Figure 1 , the aerosol generating device 12 extends along a device axis X and comprises a housing 21 delimiting a cavity 23 configured to receive, at least partially, the tobacco article 14. The cavity 23 extends for example according to the device axis X and is delimited by a bottom wall 25 perpendicular to the device axis X and at least one side wall 27 extending along the device axis X. The cavity 23 forms a heating chamber of the device 12 designed to heat the tobacco article 14 as it will be explained in further detail below. The cavity 23 can take any appropriate shape designed to receive the tobacco article 14. For example, the cavity 23 can form a shape complementary to the shape of the tobacco article 14. Additionally, according to the first embodiment of the invention, the length of the cavity 23 may be substantially equal or greater than the length of the tobacco article 14. For example, the length of the cavity 23 may be comprised between 90% and 150%, advantageously between 100% and 110%, of the length of the tobacco article 14.

In some embodiments, the aerosol generating device 12 may further comprise a mouthpiece (non-shown) which is designed to be fixed on the housing 21 to close the cavity 23 and interact with the user’s mouth during a vaping session. The mouthpiece can be hinged or screwed to an end of the housing 21 and form an outlet hole extending perpendicularly to the device axis X. According to another example, a mouthpiece is formed by an end of the tobacco article 14 which protrudes in this example from the cavity 23.

The housing 21 delimits an internal space of the device 12 receiving various elements designed to carry out different functionalities of the device 12. The internal space can for example receive a power block 31 for powering the device 12, a control module 32 for controlling the operation of the device 12 and at least a device part 39 of a heating system configured to heat a vaporizable material contained in the tobacco article 14 as it will be explained in further detail below. The internal space of the housing 21 may further comprise other internal components performing different functionalities of the device 12 known per se. These internal components will not be explained in detail below.

It should also be noted that Figure 1 presents only a schematic diagram of different components of the aerosol generating set 10 and does not necessarily show the real physical arrangement and dimensions of said components. Particularly, such an arrangement can be chosen according to the design of the aerosol generating set 10 and technical features of its components.

The power block 31 comprises a battery 35 and a battery charger 36. The battery 35 is for example a known battery designed to be charged using the power supply furnished by an external source and to provide a direct current of a predetermined voltage. The battery charger 36 is able to connect the battery 35 to the external source and comprises for this purpose a power connector (for example a mini-USB or USB-C connector) or wireless charging connector.

The control module 32 is configured to control the operation of the aerosol generating device 12 and notably, of the heating system to generate aerosol by controlling the powering of this heating system by the battery 35. For this purpose, the control module 32 is connected to the battery 35. The control performed by the control module 32 is known per se and will not be detailed hereinafter.

According to the example of Figure 1 , the heating system comprises the device part 39 and an article part (not shown) designed to interact with the device part 39 in order to generate heat. For example, the device part 39 can comprise a magnetic coil arranged around the cavity 23 and able to generate a magnetic field within this cavity 23. In this case, the article part can comprise one or several susceptors which, when placed in a magnetic field, able to generate heat for heating the vaporizable material. According to different embodiments, the or each susceptor can be comprised in the vaporizable material and/or one or several rigid sheets of the tobacco article 14.

According to other embodiments, the heating system can comprise only the device part 39 which is arranged to heat the tobacco article 14 by conduction and/or convection. For example, the device part 39 can comprise a resistive element, such as heating plate, blade, film, etc., which is arranged in the cavity in order to be in contact and/or penetrate the tobacco article 14 to heat it by conduction. According to another example, such a resistive element is arranged with a distance in respect with the tobacco article 14 to heat it by convection.

In the example of Figure 1 , the bottom wall 25 of the cavity 23 is provided with fixing means able to fix the tobacco article 14 when it is received in the cavity 23. Additionally, according to the same example, the tobacco article 14 is received in the cavity 23 by forming a gap with the side wall 27. This gap can be used to form an upstream section of a flow channel extending through the device 12 and the tobacco article 14. This upstream section can extend from the exterior of the cavity 23 until an end of the tobacco article 14 in contact with the bottom wall 25 of the cavity. According to another embodiment, no gap is provided between the side wall 27 and the tobacco article 14 and the upstream section extends for example within the device 12 from for example an inlet hole formed in the housing 21. In any case, a downstream section of the flow channel extends within the tobacco article 14. This downstream section corresponds to an airflow path formed by the tobacco article 14 as it will be explained in further detail below.

As it is shown in Figure 2, the tobacco article 14 comprises a support 51 extending along an article axis Y between a distal end 52 designed to be in contact or to face the bottom wall 25 of the cavity 23 and a proximal end 53 opposite to the distal end 52 and designed to be received in the cavity 23 or protrude from it. In this last case, the proximal end 53 can form a mouthpiece as mentioned above. When the tobacco article 14 is received in the cavity 23, the article axis Y preferably coincides with the device axis X.

The support 51 is formed by an inner sheet 61 and an outer sheet 62 which are arranged or bent to retain between them a viscous vaporizable material 63 also comprised in the tobacco article 14. In other words, the viscous vaporizable material 63 is sandwiched between the sheets 61 , 62 and is retained in this position by its viscosity. Particularly, in the example of Figure 2, each sheet 61 , 62 presents a rigid sheet, made for example form metal, which is bent to form a generally cylindrical shape of the support 51 . This cylindrical shape has advantageously a circular cross-section extending transversally to the article axis Y.

Each sheet 61 , 62 has a thickness comprised between 0,01 and 1 mm, advantageously between 0,05 and 0,5 mm. In some embodiments, this thickness can be substantially equal to 0,1 mm.

The inner sheet 61 is bent around the article axis Y to form an airflow path extending along the article axis Y between the distal end 52 and the proximal end 53. This airflow path forms thus the downstream section of the flow channel mentioned above. Additionally, the inner sheet 61 defines a plurality of perforations 65. The perforations can be arranged along the inner sheet 61 according to any suitable pattern. For example, the perforations can be homogenously distributed along the inner sheet as it is shown in Figure 3. According to another embodiment, the perforations 65 are mainly distributed in a predetermined portion of the inner sheet 61. This portion can for example form an upstream portion or a central portion or a downstream portion in respect with the airflow path. The perforations have dimensions which are advantageously comprised between 0,3 mm and 0,7 mm, and preferably substantially equal to 0,5 mm. The outer sheet 62 is for example continuous. Additionally, at least one of the sheets 61 , 62 and/or the vaporizable material 63 can comprise or form one or several susceptors able to interact with the device part 39 of the heating system to heat the vaporizable material 63.

The viscous vaporizable material 63 forms a tobacco layer and is chosen among at least one of the following elements:

- viscous T-liquid;

- viscous E-liquid;

- tobacco dough ;

- tobacco wax.

In some embodiments, the viscous vaporizable material 63 comprises a solid content and a liquid content, the ratio of the solid content being comprised between 80% and 120% of the liquid content and is advantageously equal to 100% of the liquid content. The solid content comprises for example ground tobacco. The liquid content comprises for example glycerine, preferably propylene glycol and advantageously water. The ratio of glycerine may be comprised between 50% and 100% of the liquid content. The ratio of propylene glycol may be comprised between 0% and 50% of the liquid content. The ratio of water may be comprised between 0% and 20% of the liquid content.

In some embodiments, the tobacco article 14 may further a gauze sheet 70 (shown in Figure 3) interposed between the vaporizable material 63 and at least one of the sheets 61 , 62. In the example of Figure 3, the gauze sheet 70 is interposed between the vaporizable material 63 and the inner sheet 61 . The gauze sheet 70 can for example extend according to the whole area of the inner sheet 61. The gaze sheet 70 can be made of or comprise cotton, nylon, glass fiber, cellulose, composite and/or tea bag paper. The tea bag paper may be a blend of wood and vegetable fibers.

In some embodiments, the tobacco article 14 may further comprise a filter/cooling portion fixed on its proximal end 53. This portion can comprise a filter and/or a cooler known as such. Such a portion can be assembled with at least one of the sheets 61 , 62 by an external wrapper.

A method of assembling a tobacco article 14 according to the invention will now be described in reference to Figure 4. As it is shown in this Figure, initially each of the sheets 61 , 62 and 70 presents a rectangular flat shape. These sheets can have substantially the same dimensions. In some embodiments, the inner sheet 61 and the gauze sheet 70 can be slightly shorter than the outer sheet 62. It is also considered that the inner sheet 61 is initially provided with perforations 65.

At step A, the vaporizable material 63 is applied on one of the sheets, par example on the outer sheet 62. The vaporizable material 63 can for example be glued on the corresponding surface of the outer sheet 62. At step B, the gauze sheet 70 is applied on the vaporizable material 63. At step C, the other sheet, for example the inner sheet 61 , is applied on the gauze sheet 70 to trap the vaporizable material 63 and the gauze sheet 70 between the sheets 61 , 62. At step D (not shown), the whole structure is bent around the article axis Y to form a cylindrical body as shown in Figure 3. The ends of at least the outer sheet 62, advantageously of both inner and outer sheets 61 , 62, are fixed between them to maintain the cylindrical shape. The fixing can for example be done by gluing. If the filter/cooling portion is provided, it can be then fixed on the proximal end 53 of the tobacco article 14 by the external wrapper.

SECOND EMBODIMENT OF THE INVENTION

An aerosol generating set 110 according to a second embodiment is shown in Figure 4. According to this embodiment, the aerosol generating set 110 comprises an aerosol generating device 1 12 and a plurality of tobacco articles 14.

Each tobacco article 14 is for example identical to the tobacco article 14 described in relation with the first embodiment of the invention. In the second embodiment, the tobacco articles 14 can be stacked one on the other to form a stick elongated according to the article axis Y. In this case, the airflow path of each tobacco article 14 is extended by the airflow path of the adjacent tobacco article 14. In some embodiments, fixing means can be provided on the ends of the tobacco articles 14 in order to allow the stacking. In the example of Figure 4, two tobacco articles 14 are stacked. The aerosol generating device 1 12 according to the second embodiment may differ from the aerosol generating device 12 according to the first embodiment only by the cavity 123. Particularly, according to the second embodiment of the invention, the length of the cavity 123 is at least substantially twice longer than the length of the tobacco article 14. For example, the length of the cavity 123 may be greater than 180% of the length of the tobacco article 14. In a general case, the length of the cavity 123 is adapted to the number of the tobacco articles 14 that this cavity 123 is able to receive. In the example of Figure 4, the cavity 123 is designed to receive two tobacco articles 14. Its length can thus be comprised between 180% and 220% of the length of each article 14.

The other elements of the aerosol generating device 1 12 are substantially similar to those described above. Their shapes and/or dimensions can be adapted to those of the cavity 123 according to the second embodiment of the invention.

Claims

1. A tobacco article (14) comprising a viscous vaporizable material (63) and a support (51 ), the support (51 ) being formed from one or several rigid sheets (61 , 62) arranged or bent to retain the viscous vaporizable material (63) and to form an airflow path.

2. The tobacco article (14) according to claim 1 , wherein the or each rigid sheet (61 , 62) is made of metal.

3. The tobacco article (14) according to claim 1 or 2, wherein the or each rigid sheet (61 , 62) is bent to form a cylindrical shape, advantageously having a circular cross-section.

4. The tobacco article (14) according to claim 3, comprising an outer sheet (62) and an inner sheet (61 ), the viscous vaporizable material (63) being retained between said sheets (61 , 62).

5. The tobacco article (14) according to claim 4, wherein the inner sheet (61 ) delimits the airflow path.

6. The tobacco article (14) according to claim 4 or 5, wherein the inner sheet (61 ) is perforated.

7. The tobacco article (14) according to any one of claims 4 to 6, wherein said outer sheet (62) forms a unique outer sheet (62) and said inner sheet (61 ) forms a unique inner sheet (61 ) of the article (14).

8. The tobacco article (14) according to any one of claims 4 to 7, wherein the viscous vaporizable material (63) is in direct contact with the outer sheet (61 ).

9. The tobacco article (14) according to any one of the preceding claims, further comprising a gauze sheet (70) interposed between the vaporizable material (63) and the or at least one of the rigid sheets (61 , 62).

10. The tobacco article (14) according to any one of the preceding claims, further comprising an external wrapper assembling the or each rigid sheets (61 , 62) with a filter/cooling portion.

1 1 . The tobacco article (14) according to any one of the preceding claims, wherein the viscous vaporizable material (63) comprises a solid content and a liquid content, the ratio of the solid content being comprised between 80% and 120% of the liquid content and is advantageously equal to 100% of the liquid content; advantageously, the solid content comprising ground tobacco.

12. The tobacco article (14) according to claim 1 1 , wherein the liquid content comprises glycerine, preferably propylene glycol and advantageously water.

13. The tobacco article (14) according to claim 12, wherein:

- the ratio of propylene glycol is comprised between 0% and 50% of the liquid content; and

- the ratio of water is comprised between 0% and 20% of the liquid content.

14. The tobacco article (14) according to any one of the preceding claims, wherein the viscous vaporizable material (63) forms a unique layer of vaporizable material in the article (14).

15. An aerosol generating device (12; 1 12) comprising a cavity (23; 123) configured to receive and heat the tobacco article (14) according to any one of the preceding claims.

16. The aerosol generating device (1 12) according to claim 15, wherein the cavity (123) is configured to receive and heat simultaneously at least two tobacco articles (14), the airflow path of one of the tobacco articles (14) extending the airflow path of the other tobacco article (14).

17. An assembling method of a tobacco article (14) according to any one of claims 1 to 14 taken in combination with claim 4, the method comprising the following steps:

(A) applying the viscous vaporizable material (63) on one of the rigid sheets (61 , 62);

(C) applying the other rigid sheet (61 , 62) on the vaporizable material (63);

(D) bending the result around an article axis (Y) to form the airflow path.