WO2024023263A1

WO2024023263A1 - Heated tobacco product

Info

Publication number: WO2024023263A1
Application number: PCT/EP2023/070920
Authority: WO
Inventors: Layth Sliman BOUCHUIGUIR; Pier Paolo MONTICONE
Original assignee: Jt International Sa
Priority date: 2022-07-28
Filing date: 2023-07-27
Publication date: 2024-02-01

Abstract

An aerosol generating device (20) is provided. The aerosol generating device (20) comprising: a heating chamber (21) configured to receive a tobacco portion (12) comprising a first magnetic material (13), the heating chamber (21) comprising an inner wall and a base; a heating element configured to heat the tobacco portion (12) inserted into the heating chamber (21); a second magnetic material (22) arranged at the inner wall of the heating chamber (21), the second magnetic material (22) being different to the heating element; wherein, in use, the second magnetic material (22) is magnetically coupled to the first magnetic material (21) when the tobacco portion (12) is inserted into the heating chamber (21). A system and heated tobacco product are also provided.

Description

HEATED TOBACCO PRODUCT

FIELD OF THE INVENTION

The present invention relates to a heated tobacco product for an aerosol generating device. The heated tobacco product includes a first magnetic material, which in use, is inserted into the heating chamber of an aerosol generating device, the heating chamber including a second magnetic material arranged so as to magnetically couple to the first magnetic material, and hold the heated tobacco product in a predetermined position.

BACKGROUND

Inhalers or aerosol generating devices such as e-cigarettes or vaping devices are becoming increasingly popular. They generally heat or warm a vaporisable substance to generate an aerosol for inhalation, as opposed to burning tobacco as in conventional tobacco products.

One type of vaporisable substance is a heated tobacco product. A heated tobacco product is a cylindrical tobacco unit comprised of a tobacco film, a hollow acetate tube, a polymer filter and a mouthpiece. Most heated tobacco products are cylindrical, but other constructions are of course possible.

Heated tobacco products are inserted into an aerosol generating device so that the tobacco material in the heated tobacco product can be heated. The tobacco material is typically heated to a lower temperature than conventional cigarettes, which produces an aerosol containing nicotine. A user can then inhale the aerosol.

The heated tobacco product is held in the aerosol generating device by friction or pressure between the heated tobacco product and the aerosol generating device. Specifically, the heated tobacco product is inserted into a heating chamber of the aerosol generating device, and the heating chamber is configured to hold the heated tobacco product with friction. Heated tobacco products shrink during use, so when the heated tobacco product is initially inserted into the chamber, the fit between the chamber and the heated tobacco product must be tight. Due to the closeness of the fit between the heating chamber and the heated tobacco product, the user must exert considerable force on the stick to ensure that the tobacco portion of the heated tobacco product is properly situated in the chamber for optimal heating. This can cause the heated tobacco product to break and/or bring an inconvenience to the user.

Further, when inserting the heating tobacco product into the chamber, the user is not sure if the heated tobacco product has been inserted to the correct depth in the chamber, so that the tobacco portion can be properly heated.

One answer to these problems is to slightly loosen the fit between the heated tobacco product and the heating chamber. However, this can cause the heated tobacco product to become excessively loose during vaping, due to shrinkage of the heated tobacco product. Since the remaining amount of the vaporizable materials in the heated tobacco product is reduced by heating, the heated tobacco product is gradually shrunk as the heating process continues. This could result in the heated tobacco product being released from the heating chamber during vaping, and/or insufficient heating of the shrunk heated tobacco product. This is potentially hazardous, and leads to the heated tobacco product being wasted.

The present invention provides a heated tobacco product which addresses these problems.

SUMMARY OF INVENTION

An aspect of the invention provides an aerosol generating device, comprising: a heating chamber configured to receive a tobacco portion comprising a first magnetic material, the heating chamber comprising an inner wall and a base; a heating element configured to heat the tobacco portion inserted into the heating chamber; a second magnetic material arranged at the inner wall of the heating chamber, the second magnetic material being different to the heating element; wherein, in use, the second magnetic material is magnetically coupled to the first magnetic material when the tobacco portion inserted into the heating chamber. Instead of relying on a friction-fit to secure the heated tobacco product in the heating chamber, the present invention provides an aerosol generating device with a magnetic element arranged in the heating chamber. When, in use, a heated tobacco product with a tobacco portion having a magnetic portion is inserted into the heating chamber, the magnetic material of the tobacco portion couples with the magnetic portion of the heating chamber to secure the tobacco portion in the heating chamber at a predetermined position. The tobacco portion does not encounter resistance while being inserted, so the risk of breakage is reduced and user inconvenience is reduced. Further, the user is left with no doubt that the tobacco portion has been properly inserted into the heating chamber, since the user will realise when the magnetic coupling between the tobacco portion and the heating chamber takes effect by sensation brought from the magnetic coupling.

At the same time, the heated tobacco portion will remain secure throughout use. Even if the tobacco portion shrinks due to heating of the tobacco, this does not affect the strength of the magnetic coupling between the tobacco portion and the heating element.

Accordingly, due to the magnetic coupling between the tobacco portion and the heating chamber, the present invention provides for secure insertion of a heated tobacco product, with a lower risk of breakage, and improves the reliability of the heated tobacco product, in that the tobacco portion will be secured in the heated chamber at a position that facilitates optimal heating of the tobacco portion.

Preferably, the strength of the magnetic attachment between the first magnetic material and the second magnetic material may be such that the tobacco portion is rotatable in the aerosol generating device.

This provides the user with greater freedom to manipulate the tobacco portion while a mouthpiece of the heated tobacco product is in the mouth of the user. For example, while generating aerosol, the user may rotate the device relative to the heated tobacco product. This allows the user to find a more comfortable wrist position while using the heated tobacco portion, without risking breakage of the heated tobacco product. In some examples, the second magnetic material may comprise a ring magnet arranged around the heating chamber. This provides a secure fit for the tobacco portion without relying on the tobacco portion being inserted with a particular orientation.

In some further examples, the heating element may have a hollow tube shape. A hollow tube shape readily accommodates a cylindrical tobacco portion, and distributes heat evenly, to provide improved aerosol generation. Compared to an inner heating mechanism i.e. a heating mechanism internal to the chamber, an external heating mechanism does not introduce any protruding heating element inside of the heating chamber. This reduces the risk of breakage of the heated tobacco product and the build-up of residue in the heating chamber.

In example implementations, the heating element may comprise an induction coil.

Advantageously, the induction coil may be longitudinally offset with respect to with the second magnetic material along the longitudinal direction of the heating chamber. This prevents an unwanted current from being induced in the second magnetic material.

In some implementations, the second magnetic material may be positioned closer to the base than the induction coil. This increases the insertion depth of the tobacco portion. In turn, it can be ensured that the tobacco portion is properly heated, and further improves aerosol generation.

A second aspect of the invention provides a system comprising a heated tobacco product and the aerosol generating device according to the first aspect, the heated tobacco product comprising the tobacco portion; wherein the tobacco portion further comprises a proximal end and a distal end.

Providing a heated tobacco product with the aerosol generating device discussed above provides all of the benefits of the aerosol generating device. In some advantageous implementations, the first magnetic material may comprise metallic foil arranged to partially cover the tobacco portion such that a gap is created between the metallic foil and the distal end.

A metallic foil provides the necessary magnetic qualities to ensure that the first magnetic portion and the second magnetic portion securely couple in use. Further, the metallic foil is thin enough that the size of the heated tobacco product is not affected.

Providing a gap between the metallic foil and the distal end brings further advantages. Specifically, the user tends to touch both the proximal and distal end of the heated tobacco product when handling the heated tobacco product. If there was no gap between the distal end of the tobacco portion and the metallic foil, the metallic foil would be damaged by the user during handling. As such, by providing a gap between the distal end and the metallic foil, the risk of the foil being damaged is reduced.

Advantageously, the first magnetic material may comprise steel wool configured to be arranged inside the tobacco portion.

Arranging steel wool inside the tobacco portion allows the user to safely handle the heated tobacco product without the risk of damage to the first magnetic material.

Also provided is a system comprising a heated tobacco product and the aerosol generating device according to any above example where the aerosol generating device comprises an induction heating coil, the heated tobacco product comprising the tobacco portion; wherein the first magnetic material comprises a susceptor, arranged in the tobacco portion and configured to heat the tobacco portion, when, in use, a current is induced in the susceptor.

It is known to use an induction coil and susceptor to generate aerosol. However, the present invention realises a further advantage by using the susceptor to couple the tobacco portion of the heated tobacco product to the magnetic portion of the heating chamber. The susceptor can therefore provide additional functionality beyond simply heating the tobacco portion. Since a dedicated first magnetic portion is no longer needed, weight and cost of the tobacco portion can be reduced.

In some additional examples, the length of the susceptor along the longitudinal direction of the aerosol generating device is longer than the length of the induction coil along the longitudinal direction of the aerosol generating device. This helps in ensuring a secure coupling between the second magnetic portion and the susceptor by ensuring that a part of the susceptor is not surrounded by the induction coil.

Also provided is system comprising the heated tobacco product and the aerosol generating device according to any above example where the aerosol generating device comprises an induction heating coil, the heated tobacco product comprising the tobacco portion; wherein the tobacco portion further comprises a susceptor which differs from the first magnetic material and the second magnetic material, arranged in the tobacco portion and configured to heat the tobacco portion, when, in use, a current is induced in the susceptor.

In some situations it is desirable to provide the first and second magnetic portions independently of the susceptor, as this may aid in providing a suitably strong coupling. The susceptor is kept at a relatively high temperature while generating aerosol, which causes a magnetic flux density reduction of the susceptor when the susceptor is the first magnetic portion. If the magnetic flux density of the susceptor is reduced, the strength of magnetic coupling between the susceptor and the second magnetic portion may be weakened. By using a dedicated first magnetic portion, such concern may be reduced. To ensure adequate magnetic coupling strength between the first and second magnetic portions, it is preferable that material of the first magnetic portion differs from material of the susceptor.

Advantageously, the permeability of the susceptor may be greater than the permeability of the second magnetic material and, wherein the tobacco portion further comprises: a proximal end; a distal end; and a tobacco material that partially fills the tobacco portion, such that a gap is created between the tobacco material and the distal end.

Having a susceptor of greater permeability ensures that the susceptor generates more heat than the second magnetic material. Ideally, the permeability of the second magnetic material is suitably low that very little heating is produced in the second magnetic portion. Further, providing a gap between the tobacco material and the distal end increases the proportion of the tobacco material which is surrounded by the induction coil and which is heated by the susceptor. This reduces the amount of tobacco material which is not heated and therefore wasted.

A third aspect of the invention provides a heated tobacco product, comprising: a mouthpiece portion at a first end of the heated tobacco product; a tobacco portion at a second end of the heated tobacco product, the tobacco portion and the mouthpiece portion being connected, wherein the tobacco portion comprises a first magnetic material, such that, when, in use, the tobacco portion is inserted into a heating chamber of an aerosol generating device, the first magnetic element is magnetically coupled to a second magnetic element arranged in the heating chamber, wherein, when the first magnetic material is coupled to the second magnetic material, the position of the heated tobacco product in the heating chamber is such that the heating chamber heats the tobacco portion and the mouthpiece portion extends from the device.

The heated tobacco product may therefore be securely housed within the heating chamber without the need for the heated tobacco product to be press-fitted into the heating chamber. The magnetic coupling ensures that the heated tobacco product remains secure throughout use of the product. That is, the heated tobacco product will not become loose while the product is used, for example due to shrinkage of the heated tobacco product. The heated tobacco product may be rotatable, which increases the ergonomics of the device for the user, and provides an improved user experience overall. BRIEF DESCRIPTION OF DRAWINGS

The invention will be described with reference to the accompanying drawings, in which:

Figure 1 is a schematic of a heated tobacco product comprising a magnetic material;

Figure 2 is a schematic of a heated tobacco product housed in the heating chamber of an aerosol generating device, where the heated tobacco product comprises a first magnetic material and the heating chamber comprises a second magnetic material;

Figure 3 is a schematic of a heated tobacco product housed in the heated chamber of an aerosol generating device, where the heated tobacco product comprises a susceptor, and the heating chamber comprises a second magnetic material;

Figure 4 is a schematic of a heated tobacco product housed in the heated chamber of an aerosol generating device, where the heated tobacco product comprises a first magnetic material and the second magnetic material is arranged at the base of the heating chamber;

Figures 5A to 5C are schematics of a ring magnet with various magnetic domain configurations; and

Figure 6 is a schematic of two cylindrical magnets.

DETAILED DESCRIPTION

The present disclosure relates to a heated tobacco product, also known as a heated tobacco stick, or more simply as a heat stick which includes a magnetic material which, in use, couples to another magnetic material in the heating chamber of an aerosol generating device to secure the heated tobacco product in the heating chamber at a predetermined position. An example heated tobacco product is shown in Figure 1. The heated tobacco product 10 comprises a mouthpiece portion 11 and a tobacco portion 12. The tobacco portion 12 comprises a tobacco film, which, when heated, produces a vapour which can be inhaled by a user, similar to a conventional cigarette. However, unlike a conventional cigarette, the tobacco film is heated, not burned. The mouthpiece portion 11 may include various internal components (not shown) such as a filter for filtering and cooling the vapour and a mouthpiece. The mouthpiece portion 11 may of course include other components.

In use, the user inserts the heated tobacco product 10 into the heating chamber of an aerosol generating device. The heating chamber heats the tobacco film in the tobacco portion 12 to produce a vapour, and the user inhales the vapour through the mouthpiece portion 11.

As discussed above, conventional methods for securing a heated tobacco product in the heating chamber rely on the dimensions of the heated tobacco product being slightly smaller than the dimensions of the heating chamber, so that frictional forces may secure the heated tobacco product in the heating chamber. This “friction-fit” method has various disadvantages, as discussed above. For example, the heated tobacco product may break due to the force exerted on the stick during insertion into the heating chamber.

To solve this issue, the tobacco portion 12 of the heated tobacco product 10 shown in Figure 1 further comprises a first magnetic material 13. In use, the first magnetic material 13 magnetically couples to a second magnetic material in the heating chamber of an aerosol generating device. This secures the heated tobacco product 10 in the heating chamber at a predetermined position. Typically, the mouthpiece portion 11 will extrude from the heating chamber so that the user can easily inhale the vapour generated by the tobacco film in the tobacco portion 12.

In use, the heated tobacco product 10, instead of relying on a friction-fit to secure the heated tobacco product 10 in the heating chamber, takes advantage of a magnetic coupling between the heated tobacco product 10 and the heating chamber. The tobacco portion 12 does not encounter resistance while being inserted, so the risk of breakage is reduced. Further, the user is left with no doubt that the tobacco portion has been properly inserted into the heating chamber, since the user will realise when the magnetic coupling between the tobacco portion 12 and the heating chamber takes effect.

At the same time, due to the magnetic coupling, the heated tobacco product 10 will remain secure throughout use. Even if the tobacco portion 12 shrinks due to heating of the tobacco film, the shrinkage does not affect the strength of the magnetic coupling between the tobacco portion and the heating element.

A further advantage is that the manufacturing tolerance for the dimensions of the heated tobacco product 10 is increased. That is, since the heated tobacco product 10 does not rely on frictional forces to be securely housed in the heating chamber, there is no longer a strict requirement that the dimensions of the heated tobacco product 10 are very slightly smaller than the dimension of a heating chamber. The heated tobacco product 10 is therefore easier to manufacture.

Accordingly, due to the magnetic coupling between the first magnetic material 13 of the tobacco portion 12 and the heating chamber, the present invention provides for secure insertion of the heated tobacco product 10, with a lower risk of breakage, and improves the reliability of the heated tobacco product 10, in that the tobacco portion will be secured in the heating chamber at a position that facilitates optimal heating of the tobacco portion. The heated tobacco product is also easier to manufacture compared to conventional heated tobacco products that relay on a friction-fit

The first magnetic material 13 can be any kind of suitable magnetic material. For example, the first magnetic material 13 can be any kind of metallic foil, for example iron foil. The iron foil is wrapped around the at least part of the exterior of the tobacco portion 12.

In other examples, the first magnetic material 13 may be formed of steel wool inserted into the tobacco portion 12. Metallic foil and steel wool could be used exclusively, or in combination. In some examples, the first magnetic material 13 may be arranged so that a gap is formed between the distal end 15 of the tobacco portion 12 and the magnetic material 13. This avoids damage to the first magnetic material 13 when the user handles the heated tobacco product 10.

Further, the strength of the magnetic coupling between the first magnetic material 13 and a magnetic material in a heating chamber can be tuned by appropriately adjusting the distance between the first magnetic material 13 and the second magnetic material, or by choosing magnetic materials with a particular magnetic permeability to give a desired strength of magnetic coupling. The strength of the magnetic coupling or attachment may allow the heated tobacco product 100 to rotate in the heating chamber of the aerosol generating device. This provides the user with a more ergonomic experience, since they are able to rotate the device for a more comfortable wrist position while the heated tobacco product 10 is inserted in the heating chamber.

Referring now to Figure 2, an example of a heated tobacco product 10 being inserted into the heating chamber 21 of an aerosol generating device 20 is shown. The heated tobacco product 10 is the same as described in relation to Figure 1. It can be seen that the first magnetic material 13 is surrounded by a second magnetic material 22 arranged at the inner wall of the heating chamber 21. In this particular example, the second magnetic material 22 is arranged at the base of the heating chamber 21 , but this need not be the case. For example, the second magnetic material could be positioned about halfway up the heating chamber 21. In such an example, the first magnetic material 13 would be moved to a corresponding position to ensure that the heated tobacco product 10, and especially the tobacco portion 13 are fully inserted into the heating chamber 21 .

The aerosol generating device 20 comprises the components typically found in an aerosol generating device, such as a battery, a heating element, e.g. a resistive heating element, and a user interface.

Heated tobacco product 10 is usually cylindrical, and so the heating chamber 21 is usually formed as a hollow tube. However, it would be possible to provide a heated tobacco product having a different 3D cross-section, so long as it is possible to insert the heated tobacco product 10 into the heating chamber 21 , and achieve magnetic coupling between the heated tobacco product 10 and the heating chamber 21.

The second magnetic material 22 can take a number of forms, as shown in Figures 5A to 6. Typically, the second magnetic material 22 is formed as a ring magnet 60, 70, 80. The ring magnet is arranged at the inner wall of the heating chamber 21. The inner radius of the ring magnet is at least large enough to accommodate the diameter of the heated tobacco product 10, and may be large enough to surround the exterior of the heating chamber 21 . Various arrangements of the magnetic domains are possible, as shown in Figures 5Ato 5C. For example, in Figure 5A, a first magnetic domain 61 and a second magnetic domain 62 are divided along a radial axis of the ring magnet 60. In Figure 5B, a first magnetic domain 71 and a second magnetic domain 72 are divided along a circumferential axis of the ring magnet 70. In Figure 5C, a first magnetic domain 71 and a second magnetic domain 72 are divided into an inner ring and an outer ring.

Alternatively, the second magnetic material 22, may be formed of one or more cylindrical magnets 60, shown in Figure 6. A first cylindrical magnetic 61 would be arranged on one side on the heating chamber 21 , and a second cylindrical magnet 62 arranged at an opposite side of the heating chamber. Another arrangement is possible. Equally, only one cylindrical magnetic could be used, though two is preferable for ensuring that the magnetic coupling is secure regardless of the orientation of the heated tobacco product 10. More than two cylindrical magnets 60 could be arranged in the heating chamber 21 to the same effect.

Thus far, the first magnetic material has been described as either a metallic foil wrapped around the tobacco portion, or steel wool inserted into the tobacco portion. It is of course possible that steel wool and metallic foil could be used in combination. It should be noted that the term “magnetic material” is not to be interpreted as only a permanent magnet, rather, it also includes a ferromagnet. The skilled person understands that magnetic coupling between the first magnetic material 13 and the second magnetic material 22 may be realised when at least one of the first magnetic material 13 and the second magnetic material 22 is a permanent magnet. In other words, forming one of the first magnetic material 13 or the second magnetic material 22 using a permanent magnet and forming the other of the first magnetic material 13 or the second magnetic material 22 using a ferromagnet is acceptable.

Referring to Figure 3, in other examples, the first magnetic material 33 may comprise a susceptor. The susceptor 33 is arranged inside the tobacco portion 32 of the heated tobacco product 30. When the first magnetic material is formed as a susceptor 33, the heating chamber 41 of the aerosol generating device 40 further comprises at least one induction coil 44. The skilled person understands that a susceptor is also made of a magnetic material, to allow the susceptor 33 to be heated when a current is passed through the induction coil 44. Similarly to the example of Figure 2, the second magnetic material 42 may comprise a ring magnet orat least one cylindrical magnetic arranged at an inner wall of the heating chamber 41.

The induction coil 44 may be longitudinally offset relatively to the second magnetic material 42 along the longitudinal direction of the heating chamber 41. This prevents unwanted currents being induced in the second magnetic material 42.

By taking advantage of the fact that a susceptor is magnetic material, the present disclosure provides for coupling between a heated tobacco product 30 and the heating chamber 21 of an aerosol generating device 40 without needed to add any additional components beyond the susceptor 33 to the heated tobacco product 30.

The tobacco portion 32 comprises a proximal end 34, a distal end 35 and a tobacco material 36. Figure 3 shows that the susceptor 33 and tobacco material 36 extend from the distal end 34 of the tobacco portion 32 to the proximal end. However, in some examples, the tobacco material 36 and the susceptor 33 may partially fill the tobacco portion 32, in such a way that a gap is created between the tobacco material 36, the susceptor 33, and the distal end 34. That is to say, part of the tobacco portion 32 is devoid of tobacco material 36. This is useful because part of the susceptor 33 may not be surrounded by the induction coil 44 due to the position of the second magnetic material 42. Because of this, some of the tobacco material 36 may be wasted. To avoid wastage, part of the tobacco portion 32, for example the part adjacent to the second magnetic material 42 may be devoid of tobacco material 36.

The magnetic permeability of the susceptor 33 may be greater than the permeability of the second magnetic material 42. In this way, the induction coil 44 is less likely to inadvertently induce a current in the second magnetic material 42. However, the permeability of the second magnetic material 42 is greater than 1 .

Referring now to Figure 4, another example of an aerosol generating device 50. In use, the heating chamber 51 of aerosol generating device 50 may house the tobacco portion 12 of a heated tobacco product 10. The mouthpiece portion 11 of the heated tobacco product 10 protrudes from the aerosol generating device 50. It is to be understood that the heated tobacco product 10 could be any of the heated tobacco products described above in relation to Figures 1 to 3.

The second magnetic material 55 is arranged in the base of the heating chamber 51. The first magnetic material 13 is positioned at a distal end 15 of the tobacco portion 12. This arrangement is particularly effective for ensuring that the heated tobacco product 10 is securely seated at the base of the heating chamber 51 , thereby ensuring that the tobacco portion 12 is properly heated by the heating chamber 51.

Having discussed the various implementation forms of the heated tobacco product and the aerosol generating device, it is to be understood that any of the heated tobacco products discussed above may be combined with any of the aerosol generating devices. Further, although the heated tobacco product has been described as having a first magnetic portion, the heated tobacco product could equally be provided with a plurality of magnetic portions, and these may be of different types. For example, a heated tobacco product may comprise a susceptor and steel wool.

Referring again to the magnets shown in Figures 5A to Figure 6, it will be appreciated that since the second magnetic portion is in a heating chamber, it will be exposed to high temperatures. To prevent loss of magnetic attraction between the first magnetic material and the second magnetic material, the second magnetic material may have a high Curie temperature. This means that the second magnetic material does not lose its magnetic strength when exposed to high temperature in use. As an example, the second magnetic material could comprise neodymium. Other material with a high Curie temperature would be known to the skilled person, and it would be obvious to swap one high Curie temperature material for another.

In some examples, the second magnetic material may comprise a magnetic tape arranged around the heating chamber. The tape could be arranged in the heating chamber, or externally to the heating chamber.

Another advantage of providing a heated tobacco product with a first magnetic portion is that, with the aid of suitable control circuitry, the aerosol device can detect when the heated tobacco product has been inserted into the heating chamber. This could prompt the aerosol generating device to, for example, start warming up the heater or prompt the user for information.

A heated tobacco product with a tobacco portion comprising a first magnetic material, and an aerosol generating device with a heating chamber comprising a second magnetic material have been discussed above. In use, the first magnetic portion is magnetically coupled to the second magnetic portion to secure the heated tobacco product in the heating chamber. Because the heated tobacco product can be inserted without applying excessive force, which would be needed if relying on a conventional friction-fit, the risk of breaking the heated tobacco product is reduced. Moreover, the heated tobacco product can be reliable inserted into the heating chamber so that the tobacco portion is properly heated.

It is to be understood that the above described heated tobacco product and aerosol generating device may be modified according to design choices and manufacturer’s preferences. For example, the relative proportion of the tobacco portion to the mouthpiece portion may be adjusted to make the tobacco portion longer and the mouthpiece portion shorter, or vice versa. Similarly, it is to be understood that in use, the position of the first magnetic material and the second magnetic material are such that the entire tobacco portion is housed inside the heating chamber.

The foregoing description of illustrative embodiments have been presented for purposes of illustration and of description. It is not intended to be exhaustive or limiting with respect to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the disclosed embodiments.

Claims

1 . An aerosol generating device, comprising: a heating chamber configured to receive a tobacco portion comprising a first magnetic material, the heating chamber comprising an inner wall and a base; a heating element configured to heat the tobacco portion inserted into the heating chamber; a second magnetic material arranged at the inner wall of the heating chamber, the second magnetic material being different to the heating element; wherein, in use, the second magnetic material is magnetically coupled to the first magnetic material when the tobacco portion inserted into the heating chamber.

2. The aerosol generating device according to claim 1 , wherein the strength of the magnetic attachment between the first magnetic material and the second magnetic material is such that the tobacco portion is rotatable in the aerosol generating device.

3. The aerosol generating device according to any one of claims 1 to 2, wherein the second magnetic material comprises a ring magnet arranged around the heating chamber.

4. The aerosol generating device according to claim 1 , wherein the heating element has a hollow tube shape.

5. The aerosol generating device according to any one of claim 1 to 3, wherein the heating element comprises an induction coil.

6. The aerosol generating device according to claim 5, wherein the induction coil is longitudinally offset with respect to with the second magnetic material along the longitudinal direction of the heating chamber.

7. The aerosol generating device according to claim 6, wherein the second magnetic material is positioned closer to the base than the induction coil.

8. A system comprising a heated tobacco product and the aerosol generating device according to any one of claims 1 to 4, the heated tobacco product comprising the tobacco portion; wherein the tobacco portion further comprises a proximal end and a distal end.

9. The system according to claim 8 wherein the first magnetic material comprises metallic foil arranged to partially cover the tobacco portion such that a gap is created between the metallic foil and the distal end.

10. The system according to claim 8, wherein the first magnetic material comprises steel wool configured to be arranged inside the tobacco portion.

11. A system comprising a heated tobacco product and the aerosol generating device according to any one of claims 5 to 7, the heated tobacco product comprising the tobacco portion; wherein the first magnetic material comprises a susceptor, arranged in the tobacco portion and configured to heat the tobacco portion, when, in use, a current is induced in the susceptor.

12. The system according to claim 11 , wherein the length of the susceptor along the longitudinal direction of the aerosol generating device is longer than the length of the induction coil along the longitudinal direction of the aerosol generating device.

13. A system comprising the heated tobacco product and the aerosol generating device according to any one of claims 5 to 7, the heated tobacco product comprising the tobacco portion; wherein the tobacco portion further comprises a susceptor which differs from the first magnetic material and the second magnetic material, arranged in the tobacco portion and configured to heat the tobacco portion, when, in use, a current is induced in the susceptor.

14. The system according to claim 13 wherein the permeability of the susceptor is greater than the permeability of the second magnetic material and, wherein the tobacco portion further comprises: a proximal end; a distal end; and a tobacco material that partially fills the tobacco portion, such that a gap is created between the tobacco material and the distal end.

15. A heated tobacco product, comprising: a mouthpiece portion at a first end of the heated tobacco product; a tobacco portion at a second end of the heated tobacco product, the tobacco portion and the mouthpiece portion being connected, wherein the tobacco portion comprises a first magnetic material, such that, when, in use, the tobacco portion is inserted into a heating chamber of an aerosol generating device, the first magnetic element is magnetically coupled to a second magnetic element arranged in the heating chamber, wherein, when the first magnetic material is coupled to the second magnetic material, the position of the heated tobacco product in the heating chamber is such that the heating chamber heats the tobacco portion and the mouthpiece portion extends from the device.