Aerosol generation system

Abstract

An aerosol generation system is disclosed, comprising an aerosol generation device (10) and an aerosol generating consumable (24, 110), wherein the aerosol generation device comprises: a first wall (19) and a second wall (21) defining a cavity (22) therebetween for receiving the aerosol generating consumable; a heater comprising a first substrate (18, 76) with a first heater track disposed thereon and a second substrate (20, 96) with a second heater track disposed thereon, the first heater substrate defining at least a portion of the first wall, the second heater substrate defining at least a portion of the second wall, wherein a layout (72) of the first heater track is different to a layout (92) of the second heater track, and wherein the aerosol generating consumable comprises an aerosol forming substance having a set of one or more ridges (112) on a first side of the aerosol forming substance, wherein at least a portion of the one or more ridges aligns with the first heater track layout when the aerosol generating consumable is inserted in the cavity in a first orientation.

Description

[0001] AEROSOL GENERATION SYSTEM

[0002] FIELD OF THE INVENTION

[0003] The present invention relates to an aerosol generation system comprising an aerosol generation device and an aerosol generating consumable. In particular, the present invention relates to heat-not-burn tobacco systems.

[0004] BACKGROUND

[0005] Aerosol generation devices typically have air inlet holes to draw in air from outside the device, which then flows into a heater oven or cavity of the device in which a consumable is inserted. Heating the consumable generates an aerosol which is delivered out of the cavity through a mouthpiece of the device to a user.

[0006] An object of the invention is to improve the efficiency of heating a consumable in an aerosol generation system.

[0007] SUMMARY OF THE INVENTION

[0008] According to an aspect of the invention there is provided an aerosol generation system comprising an aerosol generation device and an aerosol generating consumable, wherein the aerosol generation device comprises: a first wall and a second wall defining a cavity therebetween for receiving the aerosol generating consumable; a heater comprising a first substrate with a first heater track disposed thereon and a second substrate with a second heater track disposed thereon, the first heater substrate defining at least a portion of the first wall, the second heater substrate defining at least a portion of the second wall, wherein a layout of the first heater track is different to a layout of the second heater track, and wherein the aerosol generating consumable comprises an aerosol forming substance having a set of one or more ridges on a first side of the aerosol forming substance, wherein at least a portion of the one or more ridges aligns with the first heater track layout when the aerosol generating consumable is inserted in the cavity in a first orientation. The one or more ridges are raised from the surface of the respective side of the aerosol forming substance. Accordingly, the ridge(s) of the aerosol forming substance are raised toward the heater track. This closer proximity between the ridge(s) and the heater track optimises the transfer of heat from the heater track to the aerosol forming substance. Optionally the one or more ridges may be in direct contact with the respective heater track.

[0009] Known heaters have track layouts typically have regularly spaced track portions to provide an even distribution of heat across the heater I cavity. Having different layouts between the first heater track and the second heater track (i.e. an asymmetric or irregular arrangement of the two heater tracks) means that some portions of a heater track may be arranged closer to each other, which leads to the power density and / or heat flux to be locally increased at these locations. Other track portions may be arranged further apart to provide a lower power density I heat flux at these locations.

[0010] The differing layouts between the first and second heater tracks thus mean that different orientations of the consumable in the cavity can provide different degrees of alignment between the ridges of the aerosol forming substance and the respective heater track. As will be appreciated, this allows a user to select a preferred intensity of aerosol generation, where a greater alignment of ridge(s) and a respective heater track provides a higher degree of heat transfer in use which in turn results in a faster or greater generation of aerosol. Conversely a lesser alignment of ridge(s) and a heater track provides a lower degree of heat transfer and generation of aerosol in use.

[0011] Preferably, the aerosol forming substance has a second set of one or more ridges on a second side of the aerosol forming substance. In this way, the reverse side of the aerosol forming substance provides an additional set of ridges which can be aligned with or placed in proximity to a heater track when the consumable is received in the cavity. As should be appreciated, since the first and second heater track layouts are different, the degrees of alignment of the ridges on either side of the aerosol forming substance will depend on the arrangement of the ridges on each side. If the second set of ridges has a different pattern to the pattern of the first set of ridges, the aerosol forming substance can be heated at two different intensities depending on the orientation of the inserted consumable.

[0012] Preferably, at least a portion of the one or more ridges of the second set aligns with the second heater track layout when the aerosol generating consumable is inserted in the cavity in the first orientation. In this way, the ridges on both sides of the inserted consumable can be optimally heated as the first and second sets of ridges are aligned with the respective heater tracks of the heater. In another example, the ridges of the second set may substantially misalign with the second heater track layout (for instance if the pattern of the second set of ridges substantially matches the first set of ridges) and may provide an aerosol generating consumable that is intended to be used in the first orientation followed by a second reverse orientation (i.e. to be flipped over) to prolong the lifetime of the consumable.

[0013] Preferably, one or more airflow channels are formed alongside the one or more ridges of the first set and / or second set of one or more ridges on the respective first or second side of the aerosol forming substance when the aerosol generating consumable in inserted in the cavity. In this way, in use, air is configured to flow alongside the one or more ridges between the respective wall and the respective side of the aerosol forming substrate. The airflow channels may be configured to direct airflow along the length of the aerosol forming substance, i.e. from toward the closed end of the cavity to the open end I mouthpiece end. The ridges and channels may be straight or may be wavy I comprise one or more turns to vary the length of the ridge / channel across the aerosol forming substance. In another example, the ridges and / or grooves may extend across the entire length of a respective side of the aerosol forming substance.

[0014] Preferably, the aerosol generating consumable comprises one or more grooves on the first and second sides of the aerosol forming substance counter to the one or more ridges of the first set and second set of one or more ridges so as to provide a corrugated shape. In this way, the heat distribution across the cavity can be easily manufactured. The aerosol generating consumable may have a corrugated shape of alternating ridges and grooves across both sides of the aerosol forming substance, and where the grooves across one side correspond with the ridges on the other side (and vice versa). The corrugating shape of the aerosol forming substance may be readily made by pressing the aerosol forming substance into shape.

[0015] Preferably, the aerosol generating consumable further comprises a wrapper sleeve around the aerosol forming substance. In this way, the airflow channels along the one or more ridges can be better defined. The wrapper also provides a form of protection for the aerosol forming substance.

[0016] Preferably, the aerosol generating consumable further comprises an indication for insertion of the consumable into the aerosol generation device in the first orientation, optionally wherein the indication comprises a printed logo. In this way, a user can easily determine an orientation of the aerosol generating consumable for insertion into the cavity of the aerosol generation device.

[0017] Preferably, the wrapper sleeve comprises one or more holes, preferably wherein the one or more holes of the wrapper sleeve are arranged over the one or more airflow channels. In this way, outside air can be readily directed to the airflow channels along the aerosol forming substance.

[0018] Preferably, the first and / or second heater track is at least partially embedded in the respective first and / or second substrate such that the respective wall defined by the first and / or second heater substrate is substantially flat. In this way, an aerosol generating consumable may be easily inserted into the cavity of the aerosol generation device without damaging or undesirably compressing the aerosol forming substance of the consumable.

[0019] Preferably, the first heater track and the second heater track each comprise one or more straight sections arranged along a line substantially parallel to a longitudinal direction of the cavity, and wherein the straight sections in the respective heater tracks are offset from one another, when viewed along an axis that is parallel to the surface normal of the first wall and the second wall. Preferably, the straight sections of the first and / or second heater track is irregularly arranged across a width of the respective substrate.

[0020] As described above, known heater track layouts having straight sections which may be regularly spaced across the heater substrate. Spacing the heater track sections irregularly across the substrate allows different areas of the heater walls I cavity to have varying power densities and heat fluxes. In an example, a first spacing between a first two straight sections may be greater than a second spacing between a second two straight sections in a respective heater track

[0021] Preferably, the aerosol generation system further comprises at least one aperture in the first and / or second substrate, preferably wherein the at least one aperture is located between two straight sections of the respective substrate. In this way, outside air can be directed into the cavity through the heater substrate. The outside air may also be heated by the heater tracks before it enters the cavity. In an example, the at least one aperture may be arranged within the first spacing proximal a closed end of the cavity to ensure that generated aerosol can be readily delivered along the consumable to a user.

[0022] Preferably, at least one of the one or more holes of the wrapper sleeve at least partially align with the at least one aperture when the aerosol generating consumable in inserted in the cavity.

[0023] Preferably, the first and second substrates each comprise a ceramic material and the first and second heater tracks each comprise an electrically resistive material, preferably wherein the electrically resistive material is a metallic material. BRIEF DESCRIPTION OF DRAWINGS

[0024] Embodiments of the invention are now described, by way of example, with reference to the drawings, in which:

[0025] Figures 1Aand 1 B are schematic views of an aerosol generation device according to the present disclosure;

[0026] Figures 2A and 2B are schematic views of the different heater portions with a mouthpiece portion of the device according to the present disclosure;

[0027] Figures 3A and 3B are schematic views of different heaters according to the present disclosure;

[0028] Figures 4A and 4B are different perspectives of a heater portion according to the present disclosure;

[0029] Figure 5 is a schematic view of a wrapper of the consumable according to the present disclosure;

[0030] Figure 6 is a schematic view of a consumable provided in the heater portion of the device without an upper heater substrate according to the present disclosure;

[0031] Figures 7A and 7B are schematic views of a consumable inserted at different depths in the cavity of the device according to the present disclosure; and

[0032] Figure 8A is a cross-sectional schematic view of a heater portion and a mouthpiece portion according to the present disclosure; and

[0033] Figure 8B is another cross-sectional view of the closed end of the heater portion according to the present disclosure. DETAILED DESCRIPTION

[0034] Figure 1 A shows an outer view of an aerosol generation device 10 and Figure 1 B shows a cross-sectional view of the aerosol generation device 10 according to the present invention. The device 10 includes an outer casing 12 in which a, heater portion 14 is arranged. In this specific example, the heater portion 14 is connected to a mouthpiece portion 16 from which generated aerosol can be inhaled by a user. As will be appreciated, the device 10 shown may be further connected to a battery portion or further functional portions (such as a display and control circuitry) which are not shown in Figures 1 A and 1 B. The heater portion 14 is also described herein as an oven.

[0035] As can be seen in Figure 1 B, the heater portion 14 includes a first heater substrate 18 which defines a portion of a first wall 19 in a cavity 22 of the device 10, and a second heater substrate 20 which defines a portion of a second wall 21 in the cavity 22. The walls 19, 21 of the cavity 22 extend beyond the lengths of the respective heater substrates. The cavity 22 is substantially cuboidal in shape, and configured to receive an aerosol generating consumable 24 having a substantially thin cuboidal shape, such as a SIM card. The cavity 22 is also described as an oven space for the consumable 24. The mouthpiece portion 16 is detachably connected to the heater portion 14 I device 10 via an interface connection 26 to allow easier access to the cavity 22 (for inserting a consumable 24 or for cleaning, for example). Alternatively, a consumable 24 can also be inserted into the cavity 22 through the mouthpiece portion 16. The aerosol generation device 10 with a consumable 24 together, as shown in Figure 1 B, form the aerosol generation system of the present disclosure.

[0036] The first and second heater substrates each include a heater track 28 disposed on a surface of the respective heater substrates. The heater tracks 28 are arranged to receive electrical energy from a battery or power source (not shown) of the device 10 and to generate heat for an aerosol generating consumable 26 received in the cavity 22. Figures 2A and 2B show heater and mouthpiece portions having different heater substrates. As explained above in reference to Figures 1A and 1 B, the heater substrate is part of the heater portion wall which defines the cavity 22 in the device 10.

[0037] In Figure 2A, the heater 40 comprises a heater substrate 42 and a heater track 44 disposed on the heater substrate 42. The heater substrate 42 is made of a ceramic material and the heater track 44 is made of a metallic material. The heater 40 further includes two electrical contact points 46 which electrically connect the heater track 44 to a power source in the device. The heater track 44 is shaped as a closed loop connecting the two contact points 46, and the heater track 44 layout is designed such that the metallic track is distributed across the surface of the heater substrate 42. In this example, the heater track 44 has a wave-like or snakelike pattern such that a plurality of straight lengths 48 of the heater track 44 is arranged across the width of the heater substrate 42. The straight lengths 48 of heater track 44 define a series of track channels 50 between the lengths 48.

[0038] The straight lengths 48 may be designed to substantially align with corresponding ridge features on the surface of an inserted consumable to optimise heating efficiency. The track channels 50 may be positioned over the flat portions of a tobacco portion (i.e. in between the ridges) in the consumable. It should be understood that different heater track designs and surface features of consumables I tobacco portions can be readily applied to the present disclosure. Different heater track designs are shown in Figures 3A and 3B.

[0039] The heater substrate 42 further comprises a plurality of apertures 52 provided in the track channels 50 between the straight lengths 48 of the heater track 44. The apertures 52 are provided towards the closed end 54 of the cavity 22. This ensures that outside air is delivered toward the closed end 54 of the cavity 22 so that the air can flow toward the open end of the cavity 22 across an inserted consumable and deliver generated aerosol to the user. The apertures 52 may be formed in the heater substrate 42 by drilling or punching. Figure 2B shows another heater 60 which has a heater substrate 62 and a similar heater track 64 to that described with reference to Figure 2A. However, in Figure 2B, the heater substrate 62 does not have holes that are drilled or punched into the substrate, rather notches 66 are provided in the heater substrate 62 at an end of the substrate 62 toward the closed end 68 of the cavity 22. The notches 66 provide the air inlet function as the apertures 52, but can be more formed in a different and simpler way (by cutting for example). It should be appreciated that the notches 66 are not necessarily positioned between the lengths of heater track 64 which may also improve the ease of manufacture of the heater 60. When the heater 60 is arranged in the heater portion 14 of the device 10, the substrate 62 forms a portion of the wall defining the cavity 22, and the notches 66 in the substrate 62 form the holes I apertures in the wall.

[0040] It should therefore be understood that apertures can be provided in the walls defining the cavity 22 of the device 10 in different ways, such as by directly drilling holes 52 into a heater substrate 42 or providing notches 66 at an end of the heater substrate 62 that form apertures when placed in the heater portion 14 of the device 10.

[0041] Figures 3A and 3B show two different heaters 70, 90 with different heater track layouts. The first heater 70 of Figure 3A may define a portion of a first wall of a cavity in an aerosol generation device and the second heater 70 of Figure 3B may define a portion of a second wall of the cavity. In these specific examples, the heaters 70, 90 in Figures 3A and 3B include different areas of higher power density due to the heater track layout and different types of air inlets in the respective substrates. It will be readily apparent to the skilled person that different heater layouts may be used according to design requirements, and that the air inlets may be located at different areas in the oven cavity.

[0042] Figure 3A shows the first heater 70 having a heater track 72 layout with straight lengths 74 arranged parallel to a length of the heater substrate 76. Track channels 78 are provided between the straight lengths 74. As can be seen in the specific example of Figure 3A, the sets 80 of straight lengths 74 around the central width of the substrate 76 (indicated by the dashed line box) are arranged more closely together such that the track channels between the track lengths in this region are narrower and areas of higher power density are provided.

[0043] In addition, the first heater 70 includes further straight lengths 74 that have a greater spacing from the straight lengths 74 in the closely-arranged sets 80 to provide wider track channels 78 outside of the sets 80. It can therefore be seen that the spacings of the track straight length portions 74 are irregular to provide different widths of track channels 78. Heater 70 also includes apertures 82 in the wider track channels 78 similar to that described in reference to Figure 2A. In this example, the apertures 82 in the heater substrate 76 are provided in the wider track channels and not in the narrower track channels.

[0044] Figure 3B shows the second heater 90 having a heater track 92 with straight lengths 94 arranged parallel to a length of the heater substrate 96. As above, track channels 98 are provided between the length portions 94. As can be seen in Figure 3B, the straight length track portions 94 are arranged across the substrate 96 in pairs 100 (indicated by the dashed line box), where the lengths 94 in a pair are closely arranged, and the spacing I track channel 98 between separate pairs 100 is greater than the track channel between the lengths 94 within a pair 100. The pairs 100 of straight track portions 94 provide areas of higher power density and the wide track channels between the pairs are the areas of low I no power density across the heater 90. .

[0045] The second heater 90 also has notches 102 similar to that described in reference to Figure 2B. In Figure 3B, the wave-like pattern of the heater track 92 is arranged such that a turn 104 in the heater track 92 toward the centre of the heater substrate 96 is wider than a turn 106 toward the ends of the heater substrate 96. This provides the wider track channels 98 for the notches 102 to be cut into the end of the heater substrate 96.

[0046] Figures 4A and 4B show cross-sectional views of the first heater 70 and second heater 90 from Figures 3A and 3B arranged in the heater portion of an aerosol generation device, where the first heater 70 forms a first wall and the second heater 90 forms a second wall of the oven cavity of the heater portion. A consumable 100 is arranged in the cavity, and the cavity is sectioned across the heaters 70, 90 to show how the consumable 110 aligns with the heater tracks 72, 92 of the respective heaters 70, 90. Figures 4Aand 4B show a same arrangement of the consumable 110 in the heater portion, and where Figure 4A shows a first perspective with the first heater 70 on top, and Figure 4B shows a second perspective with the second heater 90 on top.

[0047] The consumable 110 has a plurality of ridges 112 and grooves 114 along both sides of the tobacco portion I aerosol forming substance, where each groove 114 corresponds and is counter to a ridge of the opposite side of the consumable 110. In other words, the tobacco portion of the consumable 110 has a corrugated shape. It should be understood, however, that ridges may be formed on a side of a tobacco portion without a corresponding groove on the opposite side of the tobacco portion. For example, the tobacco portion may have planar substrate (which may comprise tobacco, or another material) on which ridges of tobacco are formed I deposited. Since the ridges are raised from the substrate, channels are formed between the ridges to allow generated aerosol to accumulate and flow along the consumable out of the cavity (e.g. toward a mouthpiece portion). The channels may be straight or have bends I curves according to design requirements.

[0048] As can be seen in Figures 4A and 4B, the ridges 112 on each side of the consumable 110 are arranged to substantially align with the higher power density areas of the respective heater 70, 90 (i.e. the sets 80 of straight portions 74 in the first heater 70, and the pairs 100 of straight track portions 94 in the second heater 90). In this way, the areas of higher power density sit over and are in close proximity or in direct contact with the tobacco portion, which optimises heat flux I heat transfer and improves the heating efficiency of the device.

[0049] The consumables may further include a wrapper which wraps around the tobacco

[0050] I aerosol forming substance portion of a consumable. Figure 5 shows a wrapper 150 with no tobacco portion provided within. The wrapper 150 is made of paper, cardboard or a thin plastic sheet material, and acts like a sleeve for a tobacco portion. The wrapper is exposed at its ends 152 to allow airflow through the consumable to a mouthpiece. The wrapper 150 further comprises holes 154 which are cut into the wrapper 150. Ideally, the position of the holes 154 are determined in consideration of a tobacco portion which the wrapper 150 is intended for. For example, the holes 154 may correspond to and at least partially align with the grooves in the tobacco portion (e.g. grooves 114 in Figure 4) as well as the cavity air inlet holes in a device heater portion. It is also possible that the wrapper holes 154 are not used when the position of the consumable is away from the closed end of the cavity, such that air simply enters the consumable from the exposed end 152.

[0051] Figure 6 shows a wrapped consumable 200 in a heater portion 202 of a device excluding the top heater so that the consumable 200 can be more clearly shown in the device oven. The consumable 200 is arranged on a bottom heater 204 which forms part of the wall of the cavity of the device. The consumable 200 comprises a tobacco portion 206 having a plurality of ridges 208 and a plurality of grooves 210. The consumable 200 also comprises a wrapper 212 having a plurality of holes 214, 216. In this example, the holes 214, 216 are provided at different points across the length of the wrapper 212. In other words, some holes 216 are arranged closer to the end 218 of the consumable 200, and other holes 214 are arranged slightly further from the end 218. In either case, all the holes 214, 216 are arranged toward the same end 218 of the consumable 200 so that that air which enters the cavity must travel along the face of the tobacco portion 206 and carry generated aerosol to the mouthpiece. Arranging the holes 214, 216 at different points across the wrapper length may be due to design considerations to affect or control the pressure drop or draw resistance of the combined deviceconsumable system. As can be seen in Figure 6, holes 214 are only partially aligned with the grooves 210 of the tobacco portion, such that air which passes through the holes 214 can be partially impeded by the ridges 208 adjacent to the grooves. The concept of controlling draw resistance or pressure drop by the arrangement and alignment of oven wall apertures (air inlet holes of the oven) and the surface features of a tobacco portion is further developed in respect of the wrapper holes and the apertures in the heater substrates (or walls defining the cavity), as explained below in reference to Figures 7A and 7B.

[0052] Figures 7A and 7B show schematics of the cavity in a heater portion 250 of a device according to the present invention. Heater substrates 252, 254 define a portion of the cavity, and the substrates 252, 254 have apertures 256 toward ends of the substrates 252, 254 closer to the closed end 258 of the cavity. Figure 7A shows an arrangement where holes 302 in the wrapper of an inserted consumable 300 is partially aligned with the substrate apertures 256 and Figure 7B shows another arrangement where the wrapper holes 302 are fully aligned with the substrate apertures 256. It will be readily apparent to the skilled person how to design the heater portion 250 to allow a consumable to be inserted at different depths into the cavity.

[0053] As will be appreciated, the partial alignment of the airflow channels of a tobacco portion and / or wrapper holes 302 with the substrate apertures 256 shown in Figure 7A causes a higher pressure draw for a user. In other words, the resistance to draw or inhale from the device-consumable arrangement of Figure 7A increased due to the partial alignment of the airflow channels and / or holes 302 and apertures 256. Conversely, the pressure draw or draw resistance is reduced in the deviceconsumable arrangement of Figure 7B when the airflow channels and / or wrapper holes 302 are fully aligned with the apertures 256 of the substrates 252, 254.

[0054] Figures 8A and 8B show different schematic views of a consumable in the cavity of a heater portion 350 in a device. Figure 8B shows a cross-sectional view of the cavity end area indicated by the square 355 in Figure 8A.

[0055] Figure 8A shows the heater portion 360 and the mouthpiece portion 362 of a device, where two heaters 364 form part of the walls 366 defining the cavity 368. In this specific example, the heaters 364 are similar to that described in reference to Figures 2B and 3B, where notches are formed in the end of the respective heater substrate to provide air inlet holes 370 for the cavity 368. However, it should be understood that other forms of air inlet holes and apertures may be provided, such as in the heaters described in Figures 2A, 3A and 3B.

[0056] An aerosol forming consumable 380 is inserted in the cavity 368, and the consumable 380 includes a tobacco portion 382. As can be seen in Figure 8B the tobacco portion 382 comprises a plurality of ridges 384 and a plurality of grooves 386 on each side of the tobacco portion 382 where each ridge has a corresponding groove on the opposite side of the tobacco portion 382. When the tobacco portion 382 is heated by the heat generated by the heaters 364, aerosol is formed which can travel toward the mouthpiece portion 362 along the grooves 386 of the tobacco portion.

[0057] In the specific example in Figure 8A, the consumable 380 does not reach the closed end of the cavity 368 after it is inserted. In other words, a void 390 is provided between the closed end of the cavity 368 and the end of the consumable 380. In this examples, outside air enters the void 390 in the cavity 368 and is drawn toward the mouthpiece portion 362 when a user inhales. As will be appreciated, the airflow from the inlet holes 370 to the mouthpiece portion 112 travels along the grooves 386 of the consumable tobacco portion and delivered any generated aerosol to the user.

[0058] Figure 8B shows another cross-sectional view of the device and heater arrangement of Figure 8A with the base wall defining the closed end of the cavity removed and in which the consumable 380 is received right up to where the base wall would be (i.e. the closed end of the cavity 368) such that there would effectively be no void between the end of the consumable 380 and the closed end of the cavity). In this example, when outside air passes through the air inlet holes 370 it directly reaches the consumable 380. As can be seen in Figure 8B, the design and the features of the consumable 380 would thus affect the airflow through the different air inlet holes 370 into the cavity 368. Some inlet holes 370 are blocked by a ridge 384 of the tobacco portion 382, which would prevent or impede the airflow through those particular holes 370, which increases the draw resistance of the device. Other inlet holes 370 are aligned, or partially aligned, with the grooves 386 of the tobacco portion 382 and airflow would not be impeded (or be less impeded). As will therefore be appreciated, the design of consumables and air inlet holes I apertures and how the insertion depth of the consumable in the cavity can provide different draw resistances and pressure drops in the device.

Claims

CLAIMS1. An aerosol generation system comprising an aerosol generation device and an aerosol generating consumable, wherein the aerosol generation device comprises: a first wall and a second wall defining a cavity therebetween for receiving the aerosol generating consumable; a heater comprising a first substrate with a first heater track disposed thereon and a second substrate with a second heater track disposed thereon, the first heater substrate defining at least a portion of the first wall, the second heater substrate defining at least a portion of the second wall, wherein a layout of the first heater track is different to a layout of the second heater track, and wherein the aerosol generating consumable comprises an aerosol forming substance having a set of one or more ridges on a first side of the aerosol forming substance, wherein at least a portion of the one or more ridges aligns with the first heater track layout when the aerosol generating consumable is inserted in the cavity in a first orientation.

2. The aerosol generation system of claim 1 , wherein the aerosol forming substance has a second set of one or more ridges on a second side of the aerosol forming substance.

3. The aerosol generation system of claim 2, wherein at least a portion of the one or more ridges of the second set aligns with the second heater track layout when the aerosol generating consumable is inserted in the cavity in the first orientation.

4. The aerosol generation system of claims 1 , 2 or 3, wherein one or more airflow channels are formed alongside the one or more ridges of the first set and / or second set of one or more ridges on the respective first or second side of the aerosol forming substance when the aerosol generating consumable in inserted in the cavity.

5. The aerosol generation system of claim 4, wherein the aerosol generating consumable comprises one or more grooves on the first and second sides of the aerosol forming substance counter to the one or more ridges of the first set and second set of one or more ridges so as to provide a corrugated shape.

6. The aerosol generation system of any of the preceding claims, wherein the aerosol generating consumable further comprises a wrapper sleeve around the aerosol forming substance.

7. The aerosol generation system of any of the preceding claims, wherein the aerosol generating consumable further comprises an indication for insertion of the consumable into the aerosol generation device in the first orientation, optionally wherein the indication comprises a printed logo.

8. The aerosol generation system of claim 6 or 7, wherein the wrapper sleeve comprises one or more holes, preferably wherein the one or more holes of the wrapper sleeve are arranged over the one or more airflow channels of claim 4.

9. The aerosol generation system of any of the preceding claims, wherein the first and / or second heater track is at least partially embedded in the respective first and / or second substrate such that the respective wall defined by the first and / or second heater substrate is substantially flat.

10. The aerosol generation system of any of the preceding claims, wherein the first heater track and the second heater track each comprise one or more straight sections arranged along a line substantially parallel to a longitudinal direction of the cavity, and wherein the straight sections in the respective heater tracks are offset from one another, when viewed along an axis that is parallel to the surface normal of the first wall and the second wall.11 . The aerosol generation system of claim 11 , wherein the straight sections of the first and / or second heater track is irregularly arranged across a width of the respective substrate.

12. The aerosol generation system of any of claims 11 or 12 further comprising at least one aperture in the first and / or second substrate, preferably wherein the at least one aperture is located between two straight sections of the respective substrate.

13. The aerosol generation system of claims 8 and 12, wherein at least one of the one or more holes of the wrapper sleeve at least partially align with the at least one aperture when the aerosol generating consumable in inserted in the cavity.

14. The aerosol generation system of any of the preceding claims, wherein the first and second substrates each comprise a ceramic material and the first and second heater tracks each comprise an electrically resistive material, preferably wherein the electrically resistive material is a metallic material.

Images