EP4326102A1

EP4326102A1 - An aerosol generating article and method of manufacturing the same

Info

Publication number: EP4326102A1
Application number: EP22724086.8A
Authority: EP
Inventors: Grzegorz Aleksander PILATOWICZ
Original assignee: JT International SA
Current assignee: JT International SA
Priority date: 2021-04-23
Filing date: 2022-04-21
Publication date: 2024-02-28
Also published as: TW202241293A; WO2022223708A1; KR20240001166A; JP2024515003A

Abstract

An aerosol generating article (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) for use with an aerosol generating device (102) comprises a substantially planar aerosol generating substrate (14), at least one airflow channel (16) extending along the substantially planar aerosol generating substrate (14), and an inductively heatable susceptor (40) positioned in the aerosol generating substrate (14). The aerosol generating article can optionally include 10 a wrapping member (22) surrounding the substantially planar aerosol generating substrate (14) and the at least one airflow channel (16). Methods of manufacturing the aerosol generating article are also described.

Description

AN AEROSOL GENERATING ARTICLE AND METHOD OF MANUFACTURING THE SAME

Technical Field The present disclosure relates generally to aerosol generating articles, and more particularly to an aerosol generating article for use with an aerosol generating device for heating the aerosol generating article to generate an aerosol for inhalation by a user. Embodiments of the present disclosure also relate to a method of manufacturing an aerosol generating article. The present disclosure is particularly applicable to aerosol generating articles for use with a portable (hand-held) aerosol generating device.

Technical Background

The popularity and use of reduced-risk or modified-risk devices (also known as aerosol generating devices or vapour generating devices) has grown rapidly in recent years as an alternative to the use of traditional tobacco products. Various devices and systems are available that heat or warm aerosol generating substances to generate an aerosol for inhalation by a user.

A commonly available reduced-risk or modified-risk device is the heated substrate aerosol generating device, or so-called heat-not-bum device. Devices of this type generate an aerosol or vapour by heating an aerosol generating substrate to a temperature typically in the range 150°C to 300°C. Heating the aerosol generating substrate to a temperature within this range, without burning or combusting the aerosol generating substrate, generates a vapour which typically cools and condenses to form an aerosol for inhalation by a user of the device.

Currently available aerosol generating devices can use one of a number of different approaches to provide heat to the aerosol generating substrate. One such approach is to provide an aerosol generating device which employs an induction heating system. In such a device, an induction coil is provided in the device and an inductively heatable susceptor is provided to heat the aerosol generating substrate. Electrical energy is supplied to the induction coil when a user activates the device which in turn generates an alternating electromagnetic field. The susceptor couples with the electromagnetic field and generates heat which is transferred, for example by one or more of conduction, radiation and convention, to the aerosol generating substrate and an aerosol is generated as the aerosol generating substrate is heated.

The characteristics of the aerosol generated by the aerosol generating device are dependent upon a number of factors, including the construction of the aerosol generating article used with the aerosol generating device. There is, therefore, a desire to provide an aerosol generating article which enables the characteristics of the aerosol generated during use of the article to be optimised, and which at the same time is easy to use in combination with an aerosol generating device.

Summary of the Disclosure

According to a first aspect of the present disclosure, there is provided an aerosol generating article for use with an aerosol generating device, the aerosol generating article comprising: a substantially planar aerosol generating substrate; at least one airflow channel extending along the substantially planar aerosol generating substrate; and an inductively heatable susceptor positioned in the aerosol generating substrate.

According to a second aspect of the present disclosure, there is provided a method of manufacturing an aerosol generating article according to the first aspect, the method comprising: providing a substantially planar aerosol generating substrate; positioning an inductively heatable susceptor in the substantially planar aerosol generating substrate; and forming at least one airflow channel in the substantially planar aerosol generating substrate. According to a third aspect of the present disclosure, there is provided a method of manufacturing an aerosol generating article according to the first aspect, the method comprising: providing an inductively heatable susceptor; forming a substantially planar aerosol generating substrate around the inductively heatable susceptor; and forming at least one airflow channel in the substantially planar aerosol generating substrate.

The aerosol generating article is for use with an aerosol generating device for heating the aerosol generating substrate, without burning the aerosol generating substrate, to volatise at least one component of the aerosol generating substrate and thereby generate a heated vapour which cools and condenses to form an aerosol for inhalation by a user of the aerosol generating device. The aerosol generating device is a hand-held, portable, device.

In general terms, a vapour is a substance in the gas phase at a temperature lower than its critical temperature, which means that the vapour can be condensed to a liquid by increasing its pressure without reducing the temperature, whereas an aerosol is a suspension of fine solid particles or liquid droplets, in air or another gas. It should, however, be noted that the terms ‘aerosol’ and ‘vapour’ may be used interchangeably in this specification, particularly with regard to the form of the inhalable medium that is generated for inhalation by a user.

The aerosol generating substrate is heated rapidly and efficiently by the inductively heatable susceptor during use of the aerosol generating article in an aerosol generating device, thus providing effective and reliable vapour generation. The at least one airflow channel ensures that vapour and/or aerosol generated during use of the aerosol generating article can be directed readily to a location at which it can be inhaled by a user. The aerosol generating article may include a distal end, a proximal end (or mouth end), and a longitudinal axis which may extend between the proximal end and the distal end. The proximal end is located at an opposite end of the aerosol generating article to the distal end. More particularly, the proximal end is located downstream of the distal end with respect to an airflow direction through the aerosol generating article, e.g., during use of the aerosol generating article in an aerosol generating device. The at least one airflow channel may extend in a first direction which may be substantially parallel to the longitudinal axis. Air flows along the at least one airflow channel, from the distal end to the proximal end, during use of the aerosol generating article thereby ensuring that a maximum amount of volatile components are released into the air from the heated aerosol generating substrate as the air flows along the airflow channel. This in turn ensures that the greatest possible quantity of vapour and/or aerosol is generated and delivered to the user during use of the aerosol generating article.

The at least one airflow channel may comprise at least one groove. The at least one groove may be formed in a surface of the substantially planar aerosol generating substrate. The at least one groove can be easily formed during manufacture of the aerosol generating article, for example by pressing a surface of the substantially planar aerosol generating substrate.

The aerosol generating substrate may include a plurality of said grooves. The grooves may be arranged side by side, for example to form a fluted surface. By providing a plurality of grooves, an increased quantity of vapour and/or aerosol may be generated and delivered to the user during use of the aerosol generating article in an aerosol generating device.

The at least one airflow channel may comprise at least one airflow passage formed internally within the aerosol generating substrate. The airflow passage can be easily formed during manufacture of the aerosol generating article. Also, because the airflow passage is fully surrounded by the aerosol generating substrate, a maximum amount of volatile components can be released into the air from the heated aerosol generating substrate as the air flows along the airflow passage, thus ensuring that the greatest possible quantity of vapour and/or aerosol is generated and delivered to the user during use of the aerosol generating article in an aerosol generating device.

In one example, a single airflow passage may be formed internally within the aerosol generating substrate, for example in a substantially central position within the cross- section of the aerosol generating substrate. In another example, a plurality of airflow passages may be formed internally within the aerosol generating substrate, and the airflow passages may be arranged side by side, e.g., in a second direction perpendicular to the first direction (longitudinal direction). By providing a plurality of airflow passages, an increased quantity of vapour and/or aerosol may be generated and delivered to the user during use of the aerosol generating article in an aerosol generating device.

The aerosol generating substrate may comprise a plurality of aerosol generating strips. The aerosol generating strips may extend in a first direction, e.g., substantially parallel to the longitudinal axis, and may be arranged intermittently in a second direction which may be substantially perpendicular to the first direction. The aerosol generating article may comprise a plurality of said airflow channels and one of said airflow channels may be formed between each pair of intermittently arranged aerosol generating strips. With this arrangement, the airflow channels can be easily formed during manufacture of the aerosol generating article, for example by spacing apart the aerosol generating strips in the second direction to form the airflow channels. The aerosol generating article can, therefore, be manufactured efficiently and mass produced with relative ease.

The substantially planar aerosol generating substrate may have a flat rectangular shape and may have a pair of main surfaces. The inductively heatable susceptor may be substantially planar and may lie substantially parallel to the main surfaces. With this arrangement, heat may be transferred efficiently from the inductively heatable susceptor to the aerosol generating substrate.

The at least one airflow channel may be formed in a first main surface and the substantially planar inductively heatable susceptor may be positioned in the aerosol generating substrate closer to a second main surface than to the first main surface. This allows the aerosol generating substrate to be heated efficiently, in particular because the inductively heatable susceptor is located within the bulk of the aerosol generating substrate allowing it to be heated by conduction.

The inductively heatable susceptor may comprise discontinuities or holes therein. The inductively heatable susceptor may, for example, comprise a mesh. The discontinuities may allow vapour and/or aerosol to readily flow through the inductively heatable susceptor and to reach the at least one airflow channel, thus ensuring that an acceptable quantity of vapour and/or aerosol is generated and delivered to a user through the at least one airflow channel.

As used herein, the term “mesh” includes grids and arrays of susceptor elements, for example filaments, having spaces therebetween. The mesh may be a homogeneous susceptor mesh or may be an inhomogeneous susceptor mesh. The term “homogeneous susceptor mesh” as used herein refers to a susceptor mesh in which the susceptor elements have a uniform thickness and a uniform spacing throughout the mesh. The term “inhomogeneous susceptor mesh” as used herein refers to a susceptor mesh in which the susceptor elements have anon-uniform (i.e., variable) thickness and/or anon- uniform (i.e., variable) spacing or pitch throughout the mesh. The use of an inhomogeneous susceptor mesh may allow heating of the aerosol generating substrate to be controlled during use in an aerosol generating device.

The inhomogeneous susceptor mesh may comprise first susceptor elements having a first thickness and may comprise second susceptor elements having a second thickness greater than the first thickness. The use of the inhomogeneous susceptor mesh may allow heating of the aerosol generating substrate to be controlled, in particular because the first susceptor elements may be heated more quickly than the second susceptor elements during use of the aerosol generating article in an aerosol generating device due to the lower thermal mass of the first susceptor elements. The inhomogeneous susceptor mesh may comprise first susceptor elements having a first spacing and may comprise second susceptor elements having a second spacing greater than the first spacing. The use of the inhomogeneous susceptor mesh may allow heating of the aerosol generating substrate to be controlled, in particular because more heat may be generated by the first susceptor elements than the second susceptor elements during use of the aerosol generating article in an aerosol generating device due to the smaller spacing between the first susceptor elements, which in turn allows a greater number of the first susceptor elements than the second susceptor elements to be provided in a given volume of the aerosol generating substrate.

In a first example, the inhomogeneous susceptor mesh may be positioned in the aerosol generating substrate with the first susceptor elements adjacent to the grooves. Since there is a shorter path to the surface of the aerosol generating substrate adjacent to the grooves and a lower density (or bulk) of aerosol generating substrate adjacent to the grooves in the vicinity of the first susceptor elements, a shorter period of time is needed to generate and deliver a sufficient amount of vapour to the grooves for inhalation by a user. In other words, the preheat time, or time to first puff, is reduced.

In a second example, the inhomogeneous susceptor mesh may be positioned in the aerosol generating substrate with the second susceptor elements adjacent to the grooves and the first susceptor elements between the grooves. Since there is a longer path to the surface of the aerosol generating substrate at positions between the grooves and higher density (or bulk) of aerosol generating substrate in the vicinity of the first susceptor elements, a more uniform heating of the aerosol generating substrate may be achieved, thus increasing the total volume of vapour that is generated during use of the aerosol generating article during a predetermined time period (e.g., a total session time).

The aerosol generating article may further comprise a wrapping member which may surround the substantially planar aerosol generating substrate and the at least one airflow channel. By surrounding the at least one airflow channel with the wrapping member, vapour and/or aerosol generated during use of the aerosol generating article in an aerosol generating device flows internally within the article, along the at least one airflow channel, before it is inhaled by a user. The formation of condensed matter on the internal surfaces of the aerosol generating device is thereby substantially eliminated, or at least minimised, and this may provide a number of benefits. For example, it may help to reduce residue build-up within the aerosol generating device, and reduce the number of cleaning and maintenance operations that a user of the device must perform. It may also help to ensure that the greatest possible quantity of vapour and/or aerosol is delivered to the user, and that the delivered vapour and/or aerosol has optimal characteristics.

The substantially planar aerosol generating substrate may have a flat rectangular shape and may have a pair of main surfaces. The wrapping member may comprise a pair of rectangular sheets which may be attached, respectively, to the pair of main surfaces. The aerosol generating article may have a pleasing aesthetic appearance due to the flat rectangular shape of the aerosol generating substrate. The aerosol generating substrate and the inductively heatable susceptor may be readily covered by the wrapping member, thereby ensuring that a user does not directly touch the aerosol generating substrate during handling of the aerosol generating article. The flat rectangular shape may also facilitate packaging and storage of multiple aerosol generating articles.

The wrapping member may comprise a material which is substantially non-electrically conductive and non-magnetically permeable and may, for example, comprise a paper wrapper. The use of a paper wrapper may facilitate manufacture and handing of the aerosol generating article and may enhance aerosol generation.

The wrapping member may have a porous inner surface which may face towards the aerosol generating substrate for absorbing condensation. The porous inner surface may further help to ensure that the formation of condensed matter on the internal surfaces of the aerosol generating device is substantially eliminated, or at least minimised. The wrapping member may have an anti-stick outer surface which may face away from the aerosol generating substrate. For example, the wrapping member may comprise an anti stick coating on the outer surface. The anti-stick outer surface may help to ensure that the wrapping member does not stick to surfaces of the aerosol generating device when it has been heated. Together, the porous inner surface and the anti-stick outer surface may help to reduce residue build-up within the aerosol generating device, thus reducing the number of cleaning and maintenance operations that a user of the device may have to perform.

The aerosol generating article may comprise a support member which may form a mouth-end portion of the article. The support member may have a tubular form, e.g., a rectangular tubular form, to receive a downstream end of the aerosol generating substrate and the at least one airflow channel. The support member may be self- supporting and may, for example, comprise cardboard or a plastics material. The support member may advantageously deliver vapour and/or aerosol generated during use of the article directly to a user’s mouth. The support member may allow heated vapour generated during use of the aerosol generating article to cool and condense to form an aerosol with optimal characteristics for inhalation by a user.

The aerosol generating substrate may comprise a non-liquid aerosol generating material, for example any type of solid or semi-solid material. Example types of aerosol generating solids include powder, granules, pellets, shreds, strands, particles, gel, strips, loose leaves, cut leaves, cut filler, porous material, foam material or sheets. The aerosol generating substrate may comprise plant derived material and in particular, may comprise a tobacco. It may advantageously comprise reconstituted tobacco, for example including tobacco and any one or more of cellulose fibres, tobacco stalk fibres and inorganic fillers such as CaC03.

Consequently, the aerosol generating device with which the aerosol generating articles are intended for use may be referred to as a “heated tobacco device”, a “heat-not-bum tobacco device”, a “device for vaporising tobacco products”, and the like, with this being interpreted as a device suitable for achieving these effects. The features disclosed herein are equally applicable to devices which are designed to vaporise any aerosol generating substrate. The aerosol generating substrate may comprise an aerosol-former. Examples of aerosol- formers include polyhydric alcohols and mixtures thereof such as glycerine or propylene glycol. Typically, the aerosol generating substrate may comprise an aerosol- former content of between approximately 5% and approximately 50% on a dry weight basis. In some embodiments, the aerosol generating substrate may comprise an aerosol- former content of between approximately 10% and approximately 20% on a dry weight basis, and possibly approximately 15% on a dry weight basis.

The inductively heatable susceptor may comprise a metal. The metal is typically selected from the group consisting of stainless steel and carbon steel. The inductively heatable susceptor could, however, comprise any suitable material including one or more, but not limited, of aluminium, iron, nickel, stainless steel, carbon steel, and alloys thereof, e.g., Nickel Chromium or Nickel Copper. With the application of an electromagnetic field in its vicinity during use of the aerosol generating article in an aerosol generating device, the inductively heatable susceptor may generate heat due to eddy currents and magnetic hysteresis losses.

Upon being heated by the inductively heatable susceptor, the aerosol generating substrate may release volatile compounds. The volatile compounds may include nicotine or flavour compounds such as tobacco flavouring.

Brief Description of the Drawings

Figure 1 is a diagrammatic longitudinal cross-sectional view of a first example of an aerosol generating article;

Figure 2 is a diagrammatic cross-sectional view along the line A-A in Figure 1;

Figure 3 is a diagrammatic cross-sectional view similar to Figure 2 of a second example of an aerosol generating article;

Figure 4 is a diagrammatic cross-sectional view similar to Figure 3 of a third example of an aerosol generating article;

Figure 5a is a diagrammatic longitudinal cross-sectional view of a fourth example of an aerosol generating article;

Figure 5b is a diagrammatic cross-sectional view along the line B-B in Figure 5a; Figure 6 is a diagrammatic longitudinal cross-sectional view of a fifth example of an aerosol generating article;

Figure 7 is a diagrammatic longitudinal cross-sectional view of a sixth example of an aerosol generating article;

Figure 8 is a diagrammatic cross-sectional view along the line C-C in Figure 7;

Figure 9 is a diagrammatic cross-sectional view similar to Figure 2 of a seventh example of an aerosol generating article;

Figure 10 is a diagrammatic cross-sectional view similar to Figure 2 of an eighth example of an aerosol generating article;

Figure 11 is a diagrammatic cross-sectional view similar to Figure 2 of a ninth example of an aerosol generating article;

Figure 12 is a diagrammatic cross-sectional view similar to Figure 2 of a tenth example of an aerosol generating article; and

Figure 13 is a diagrammatic cross-sectional view of an aerosol generating system comprising an aerosol generating device and an aerosol generating article according to the present disclosure.

Detailed Description of Embodiments

Embodiments of the present disclosure will now be described by way of example only and with reference to the accompanying drawings.

Referring initially to Figures 1 and 2, there is shown a first example of an aerosol generating article 1 for use with an electrically-operated aerosol generating device 102, an example of which will be described later in this specification with reference to Figure 13. The aerosol generating article 1 is substantially planar and has a distal end 10 and a proximal end 12 (or mouth end) at the opposite end of the aerosol generating article 1. The proximal end 12 is downstream of the distal end 10 with respect to an airflow direction through the aerosol generating article 1 as represented in Figure 1 by the three arrows. A longitudinal axis extends between the distal end 10 and the proximal end 12 to define a longitudinal direction of the aerosol generating article 1. The aerosol generating article 1 comprises a substantially planar aerosol generating substrate 14. The aerosol generating substrate 14 comprises a bulk or mass of aerosol generating material and has a flat rectangular shape with a pair of oppositely disposed first and second main surfaces 14a, 14b. The aerosol generating article 1 is a consumable, or disposable, article in which the aerosol generating substrate 14 may comprise tobacco or a tobacco material.

The aerosol generating article 1 comprises a plurality of airflow channels 16 which, in the illustrated example, comprise a plurality of grooves 18 formed in the first main surface 14a of the aerosol generating substrate 14. The grooves 18 are arranged side- by-side and parallel to each other, and the grooves 18 extend in the longitudinal direction between the distal end 10 and the proximal end 12, substantially parallel to the longitudinal axis. Together, the grooves 18 form a fluted surface 20. The grooves 18 may be formed in any suitable manner, for example by pressing the first main surface 14a of the aerosol generating substrate 14 with a suitably shaped pressing tool. Three grooves 18 are shown in the example of Figures 1 and 2, but it will be understood that any suitable number of grooves 18 can be provided, for example depending on the desired resistance-to-draw of the aerosol generating article 1. It should also be noted that the grooves 18 may have any suitable cross-sectional shape including, but not limited to, square as illustrated in Figure 2, rectangular, trapezoidal, or semi-circular.

The aerosol generating article 1 comprises a substantially planar inductively heatable susceptor 40 positioned in the aerosol generating substrate 14 and arranged substantially parallel to the first and second main surfaces 14a, 14b. The inductively heatable susceptor 40 includes a plurality of holes or discontinuities 42 to allow air and/or vapour to pass through it. In some embodiments, the inductively heatable susceptor 40 can comprise a substantially planar mesh 43. The inductively heatable susceptor 40 is positioned in the aerosol generating substrate 14 closer to the second main surface 14b than to the first main surface 14a, although other positions are possible and entirely within the scope of the present disclosure. Referring now to Figure 3, there is shown a second example of an aerosol generating article 2. The aerosol generating article 2 is similar to the aerosol generating article 1 described above with reference to Figures 1 and 2 and corresponding features are identified using the same reference numerals.

The aerosol generating article 2 includes a plurality of airflow channels 16 in the form of airflow passages 30 formed internally within the aerosol generating substrate 14. Like the grooves 18, the airflow passages 30 extend in the longitudinal direction, between the distal end 10 and the proximal end 12, substantially parallel to the longitudinal axis. The airflow passages 30 are arranged side-by-side within the aerosol generating substrate 14 closer to the first main surface 14a than the second main surface 14b, although different positions could be adopted provided that each airflow passage 30 is fully surrounded by the aerosol generating material that forms the aerosol generating substrate 14. It should also be noted that the airflow passages 30 may have a variety of cross-sectional shapes including, but not limited to, square as illustrated in Figure 3, rectangular, circular, oval, or triangular.

Referring now to Figure 4, there is shown a third example of an aerosol generating article 3. The aerosol generating article 3 is similar to the aerosol generating article 2 described above with reference to Figure 3 and corresponding features are identified using the same reference numerals.

The aerosol generating article 3 includes an airflow channel 16 in the form of a single airflow passage 30 formed internally within the aerosol generating substrate 14. The airflow passage 30 extends in the longitudinal direction, between the distal end 10 and the proximal end 12, substantially parallel to the longitudinal axis. The airflow passage 30 is positioned closer to the first main surface 14a than to the second main surface 14b of the aerosol generating substrate 14 and is surrounded on all sides by the aerosol generating substrate 14, ensuring that volatile components can be released from the aerosol generating substrate 14 and entrained in air flowing through the airflow passage 30 during use of the aerosol generating article 3 in an aerosol generating device 102. The aerosol generating articles 1, 2, 3 described above can be manufactured by (i) providing a substantially planar aerosol generating substrate 14; (ii) positioning an inductively heatable susceptor 40 in the substantially planar aerosol generating substrate 14; and (iii) forming at least one airflow channel 16 (e.g., a groove 18 or an airflow passage 30) in the substantially planar aerosol generating substrate 14. Purely by way of example, steps (i) and (ii) could be performed by providing first and second aerosol generating sheets with the inductively heatable susceptor 40 positioned between them and thereafter pressing the aerosol generating sheets together to form the substantially planar aerosol generating substrate 14. Steps (ii) and (iii) could be performed in any order, for example the at least one airflow channel 16 could be formed in the substantially planar aerosol generating substrate 14 before the inductively heatable susceptor 40 is positioned in the aerosol generating substrate 14. Steps (ii) and (iii) could be performed simultaneously in some embodiments.

Alternatively, the aerosol generating articles 1, 2, 3 described above could be manufactured by (i) providing an inductively heatable susceptor 40; and (ii) forming a substantially planar aerosol generating substrate 14 around the inductively heatable susceptor 40. For example, the aerosol generating substrate 14 could be applied as a paste to the inductively heatable susceptor 40 (e.g., susceptor mesh 43) before being cured to form the substantially planar aerosol generating substrate 14 with the inductively heatable susceptor 40 positioned therein. As a final step, the method may comprise (iii) forming at least one airflow channel 16 (e.g., a groove 18 or an airflow passage 30) in the substantially planar aerosol generating substrate 14.

Referring now to Figures 5a and 5b, there is shown a fourth example of an aerosol generating article 4. The aerosol generating article 4 is similar to the aerosol generating article 1 described above with reference to Figures 1 and 2 and corresponding features are identified using the same reference numerals.

The aerosol generating article 4 has the same construction as the aerosol generating article 1 and in addition comprises a wrapping member 22 which surrounds the aerosol generating substrate 14, the inductively heatable susceptor 40, and the grooves 18. The aerosol generating substrate 14, the inductively heatable susceptor 40, and the grooves 18 are, thus, fully enclosed by the wrapping member 22 which may, for example, comprise cigarette paper or a similar material. The wrapping member 22 comprises a pair of rectangular sheets 24, 26 which are attached, respectively, to the first and second main surfaces 14a, 14b of the aerosol generating substrate 14. The rectangular sheets 24, 26 are typically formed by a single sheet of material which is wrapped around the aerosol generating substrate 14 and which may have overlapping edges that are adhered to each other to secure the wrapping member 22 in position around the aerosol generating substrate 14 and the grooves 18.

In an exemplary and non-limiting example, the aerosol generating substrate 14 may have a length (in the longitudinal direction of the aerosol generating article 4) of approximately 18.0 mm, may have a width of approximately 11.8 mm, and may have a thickness (or depth) of approximately 1.2 mm. The aerosol generating substrate 14 may be spaced inwardly from the distal end 10 of the aerosol generating article 4 by a small distance, for example approximately 3.0 mm, as shown in Figure 5a. The aerosol generating article 4 may have a width of approximately 12.0 mm and a thickness (or depth) of approximately 1.4 mm to accommodate the aerosol generating substrate 14 and the inductively heatable susceptor 40 inside the wrapping member 22. The aerosol generating article 4 may have any suitable length between the distal end 10 and the proximal end 12 by varying the length of the portion of the wrapping member 22 that extends between the downstream end of the aerosol generating substrate 14 and the proximal end 12. As vapour flows through this portion of the wrapping member 22 during use of the aerosol generating article 4 in an aerosol generating device 102, the vapour may cool and condense to form an aerosol for inhalation by a user. Thus, the length of the portion of the wrapping member 22 that extends between the downstream end of the aerosol generating substrate 14 and the proximal end 12 of the aerosol generating article 4 may be selected at the time of manufacture to provide an aerosol with desired characteristics.

In some embodiments, the wrapping member 22 comprises a porous inner surface 22a which faces towards the aerosol generating substrate 14 and which is capable of absorbing condensation that may be formed during the heating process. Alternatively or in addition, the wrapping member 22 can comprise an anti-stick outer surface 22b facing away from the aerosol generating substrate 14 to reduce the risk of the wrapping member 22 sticking to surfaces of the aerosol generating device 102 when it has been heated. The anti-stick outer surface 22b may comprise an anti-stick coating on the outer surface 22b of the wrapping member 22.

The aerosol generating article 4 may be manufactured by the methods described above and comprises a further step of wrapping the substantially planar aerosol generating substrate 14 with a wrapping member 22 to form the substantially planar aerosol generating article 4.

Referring now to Figure 6, there is shown a fifth example of an aerosol generating article 5. The aerosol generating article 5 is similar to the aerosol generating article 4 described above with reference to Figures 5a and 5b and corresponding features are identified using the same reference numerals.

The aerosol generating article 5 includes a support member 28 positioned at the proximal end 12 of the aerosol generating article 5 to form a mouth-end portion 34 which can be engaged by a user’s lips during use of the aerosol generating article 5 in an aerosol generating device 102. The support member 28 typically comprises a self- supporting material such as cardboard or a plastics material and has a rectangular tubular form when viewed in cross-section to receive a downstream end of the aerosol generating substrate 14 and the grooves 18 formed in the first main surface 14a. The wrapping member 22 also surrounds the support member 28.

Referring now to Figures 7 and 8, there is shown a sixth example of an aerosol generating article 6. The aerosol generating article 6 is similar to the aerosol generating article 4 described above with reference to Figures 5a and 5b and corresponding features are identified using the same reference numerals. In the aerosol generating article 6, the aerosol generating substrate 14 comprises a plurality of aerosol generating strips 32 which extend in a first direction, substantially parallel to the longitudinal direction of the aerosol generating article 6, between the distal end 10 and the proximal end 12. The aerosol generating strips 32 are spaced apart laterally, in other words they are arranged intermittently and spaced apart in a second direction perpendicular to the first direction. This intermittent arrangement (or spacing) of the aerosol generating strips 32 forms airflow channels 16, with an airflow channel 16 being formed between each adjacent pair of aerosol generating strips 32.

The aerosol generating article 6 is shown without a support member 28 at the proximal end 12. A support member 28 can, however, be provided at the proximal end 12 of the aerosol generating article 6 as explained above in connection with the aerosol generating article 5 of Figure 6.

Referring now to Figures 9 and 10, there are shown a seventh and eighth examples of an aerosol generating article 7, 8. The aerosol generating articles 7, 8 are similar to the aerosol generating article 1 described above with reference to Figures 1 and 2 and corresponding features are identified using the same reference numerals.

In the aerosol generating articles 7, 8, the inductively heatable susceptor 40 comprises an inhomogeneous susceptor mesh 43. The inhomogeneous susceptor mesh 43 comprises a plurality of first susceptor elements 44 having a first thickness and a plurality of second susceptor elements 46 having a second thickness which is greater than the first thickness of the first susceptor elements 44.

In the aerosol generating article 7, the inhomogeneous susceptor mesh 43 is positioned in the aerosol generating substrate 14 so that the thinner first susceptor elements 44 are located adjacent to (specifically below) the grooves 18 where there is a shorter path to the surface of the aerosol generating substrate 14 and a lower density (or bulk) of the aerosol generating substrate 14. With this configuration, the time to first puff may be reduced. In the aerosol generating article 8, the inhomogeneous susceptor mesh 43 is positioned in the aerosol generating substrate 14 so that the thicker second susceptor elements 46 are located adjacent to (specifically below) the grooves 18 and the thinner first susceptor elements 44 are located between the grooves 18 where there is a longer path to the surface of the aerosol generating substrate 14 and a higher density (or bulk) of aerosol generating substrate 14. With this configuration, a more uniform heating of the aerosol generating substrate 14 may be achieved, providing an increased volume of vapour during a predetermined time period (e.g., a total session time).

Referring now to Figures 11 and 12, there are shown a ninth and tenth examples of an aerosol generating article 9, 10. The aerosol generating articles 9, 10 are similar to the aerosol generating article 1 described above with reference to Figures 1 and 2 and corresponding features are identified using the same reference numerals.

In the aerosol generating articles 9, 10, the inductively heatable susceptor 40 comprises an inhomogeneous susceptor mesh 43. The inhomogeneous susceptor mesh 43 comprises a plurality of first susceptor elements 44 having a first spacing (or pitch) and a plurality of second susceptor elements 46 having a second spacing (or pitch) which is greater than the first spacing (or pitch) of the first susceptor elements 44.

In the aerosol generating article 9, the inhomogeneous susceptor mesh 43 is positioned in the aerosol generating substrate 14 so that the first susceptor elements 44 (with the smaller spacing or pitch) are located adjacent to the grooves 18 where there is a shorter path to the surface of the aerosol generating substrate 14 and a lower density (or bulk) of the aerosol generating substrate 14. This configuration provides the same effect as that described with reference to Figure 9.

In the aerosol generating article 10, the inhomogeneous susceptor mesh 43 is positioned in the aerosol generating substrate 14 so that the second susceptor elements 46 (with the larger spacing or pitch) are located adjacent to the grooves 18 and the first susceptor elements 44 (with the smaller spacing or pitch) are located between the grooves 18 where there is a longer path to the surface of the aerosol generating substrate 14 and a higher density (or bulk) of aerosol generating substrate 14. This configuration provides the same effect as that described with reference to Figure 10.

Referring now to Figure 13, there is shown an aerosol generating system 100 comprising an aerosol generating device 102 and a fourth example of an aerosol generating article 4 as described above with reference to Figures 5a and 5b. It will be appreciated that the aerosol generating device 102 could be used in combination with an alternative aerosol generating article according to the present disclosure, such as the examples of the aerosol generating articles 1, 2, 3, 5, 6, 7, 8, 9, 10 described above with reference to Figures 1 to 4 and 6 to 12.

The aerosol generating device 102 comprises a receiving chamber 106 and an electromagnetic field generator 104 positioned in the device body 108. The electromagnetic field generator 104 may include a first planar coil 122 and a second planar coil 124, although it may be sufficient that just a single planar coil 122, 124 is provided. In the example illustrated in Figure 13, the first and second planar coils 122, 124 are flat spiral coils positioned on opposite sides of the receiving chamber 106.

In use, a user inserts the aerosol generating article 4 into the receiving chamber 106. The aerosol generating device 102 may include a cover 110 and a pivotal mounting 112 that allows the cover 110 to be moved between a closed position shown in Figure 13 and an open position (not shown). As will be understood by one of ordinary skill in the art, a user must pivot the cover 110 to the open position to permit insertion of the aerosol generating article 4 into the receiving chamber 106 and then pivot the cover 110 back to the closed position shown in Figure 13 to retain the aerosol generating article 4 in position in the receiving chamber 106.

The aerosol generating device 102 includes a power source 114, e.g., a rechargeable battery, and a controller 116. The first and second planar coils 122, 124 can be energised by the power source 114 and controller 116, for example manually, e.g., via a user interface such as a button on the aerosol generating device 102, or automatically in response to a user drawing on a mouthpiece 118 of the aerosol generating device 102. The controller 116 may include, amongst other electronic components, an inverter which is arranged to convert a direct current from the power source 114 into an alternating high-frequency current for the first and second planar coils 122, 124. When the first and second planar coils 122, 124 are energised by the alternating high- frequency current, alternating and time-varying electromagnetic fields are produced that penetrate the receiving chamber 106 and the aerosol generating article 4 positioned therein. The electromagnetic fields couple with the inductively heatable susceptor 40 and generate eddy currents and/or magnetic hysteresis losses in the inductively heatable susceptor 40 causing it to heat up. The heat is then transferred from the inductively heatable susceptor 40 to the aerosol generating substrate 14, for example by conduction, radiation and convection.

The heat transferred from the inductively heatable susceptor 40 to the aerosol generating substrate 14 causes it to heat up without being burned and to thereby release one or more volatile components. The aerosol generating device 102 includes one or more air inlets 120 to allow air to flow into the aerosol generating article 4 and through the grooves 18 formed in the first main surface 14a of the aerosol generating substrate 14. The airflow direction is illustrated by the arrow in Figure 13. The volatile components are entrained in the air flowing through the grooves 18 thereby forming a vapour. The vapour cools and condenses as it flows through the grooves 18 to form an aerosol which is inhaled by a user through the mouthpiece 118 of the aerosol generating device 102.

When the aerosol generating substrate 14 becomes depleted and no longer releases sufficient volatile components to generate an aerosol with acceptable qualities, the aerosol generating article 4 can be removed from the receiving chamber 106 after pivoting the cover 110 to the open position, and a replacement aerosol generating article 4 can be inserted in its place. In the event that the aerosol generating device 102 is used in combination with an aerosol generating article having a support member 28, for example the fifth example of the aerosol generating article 5 described above with reference to Figure 6, the support member 28 may project from an open end 106a of the receiving chamber 106 thereby enabling a user’s lips to engage the mouth-end portion 34 of the aerosol generating article 5 formed by the support member 28. It should be appreciated by one of ordinary skill in the art that the aerosol generating device 102 described with reference to Figure 13 is a conceptual design example used to illustrate the principles of aerosol generating articles according to the present disclosure. The aerosol generating articles according to the present disclosure may be used with any inductively heated aerosol generating device 102 of suitable design.

Although exemplary embodiments have been described in the preceding paragraphs, it should be understood that various modifications may be made to those embodiments without departing from the scope of the appended claims. Thus, the breadth and scope of the claims should not be limited to the above-described exemplary embodiments.

Any combination of the above-described features in all possible variations thereof is encompassed by the present disclosure unless otherwise indicated herein or otherwise clearly contradicted by context. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like, are to be construed in an inclusive as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”.

Claims

1. An aerosol generating article (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) for use with an aerosol generating device (102), the aerosol generating article comprising: a substantially planar aerosol generating substrate (14); at least one airflow channel (16) extending along the substantially planar aerosol generating substrate (14); and an inductively heatable susceptor (40) positioned in the aerosol generating substrate (14).

2. An aerosol generating article according to claim 1, wherein the aerosol generating article includes a distal end (10), a proximal end (12), a longitudinal axis extending between the proximal end (12) and the distal end (10), and the at least one airflow channel (16) extends in a first direction substantially parallel to the longitudinal axis.

3. An aerosol generating article according to claim 1 or claim 2, wherein the at least one airflow channel (16) comprises at least one groove (18) formed in a surface (14a) of the substantially planar aerosol generating substrate (14).

4. An aerosol generating article according to claim 3, wherein the aerosol generating substrate (14) includes a plurality of said grooves (18) arranged side by side to form a fluted surface (20).

5. An aerosol generating article according to claim 1 or claim 2, wherein the at least one airflow channel (16) comprises at least one airflow passage (30) formed internally within the aerosol generating substrate (14).

6. An aerosol generating article according to any preceding claim, wherein: the aerosol generating substrate (14) comprises a plurality of aerosol generating strips (32) extending in a first direction and arranged intermittently in a second direction perpendicular to the first direction; the aerosol generating article comprises a plurality of said airflow channels (16) and one of said airflow channels (16) is formed between each pair of intermittently arranged aerosol generating strips (32).

7. An aerosol generating article according to any preceding claim, wherein the substantially planar aerosol generating substrate (14) has aflat rectangular shape having a pair of main surfaces (14a, 14b), and the inductively heatable susceptor (40) is substantially planar and lies substantially parallel to the main surfaces (14a, 14b).

8. An aerosol generating article according to claim 7, wherein the at least one airflow channel (16) is formed in a first main surface (14a) and the substantially planar inductively heatable susceptor (40) is positioned in the aerosol generating substrate (14) closer to a second main surface (14b) than to the first main surface (14a).

9. An aerosol generating article according to any preceding claim, wherein the inductively heatable susceptor (40) comprises discontinuities or holes (42) therein, preferably wherein the inductively heatable susceptor (40) comprises a mesh (43).

10. An aerosol generating article according to any preceding claim, further comprising a wrapping member (22) surrounding the substantially planar aerosol generating substrate (14) and the at least one airflow channel (16).

11. An aerosol generating article according to claim 10, wherein the substantially planar aerosol generating substrate (14) has a flat rectangular shape having a pair of main surfaces (14a, 14b) and the wrapping member (22) comprises a pair of rectangular sheets (24, 26) attached, respectively, to the pair of main surfaces (14a, 14b).

12. An aerosol generating article according to claim 10 or claim 11, wherein the wrapping member (22) has a porous inner surface (22a) facing towards the aerosol generating substrate (14) for absorbing condensation and an anti-stick outer surface (22b) facing away from the aerosol generating substrate (14), preferably wherein the wrapping member (22) comprises an anti-stick coating on the outer surface (22b).

13. An aerosol generating article according to any preceding claim, wherein the aerosol generating article comprises a support member (28) forming a mouth-end portion (34) of the article, and the support member (28) has a tubular form to receive a downstream end of the aerosol generating substrate (14) and the at least one airflow channel (16).

14. A method of manufacturing an aerosol generating article according to any preceding claim, the method comprising: providing a substantially planar aerosol generating substrate (14); positioning an inductively heatable susceptor (40) in the substantially planar aerosol generating substrate (14); and forming at least one airflow channel (16) in the substantially planar aerosol generating substrate (14).

15. A method of manufacturing an aerosol generating article according to any of claims 1 to 13, the method comprising: providing an inductively heatable susceptor (40); forming a substantially planar aerosol generating substrate (14) around the inductively heatable susceptor (20); and forming at least one airflow channel (16) in the substantially planar aerosol generating substrate (14).