Cartridge for use in aerosol generators

Abstract

A cartridge (10) for use in an aerosol generator (600), the cartridge (10) comprises a housing (100) having a body (150) extending between an upstream portion (130) and a downstream portion (140), the upstream portion (130) having an inlet (110) and the downstream portion having an outlet (120), and the body (150) defining a chamber (400) between the upstream portion (130) and the downstream portion (140); a heating element (200) for heating an aerosol forming substrate to form an aerosol, the heating element (200) extending into the chamber (400); the chamber (400) including a first portion (410) on a first side surface of the heating element (200) and a second portion (420) on a second side surface of the heating element (200); and an aerosol forming substrate (300) disposed in at least one of the first portion (410) and the second portion (420). The main body (150) has dimensions in an axial cross-section: an internal area of ​​40 to 80 square millimeters and an outer circumference of at least 30 millimeters. The ratio of the outer circumference to the internal area is at least 0.38.

Description

[Technical Field]

[0001] The present invention relates to a cartridge for use in an aerosol generator. The cartridge comprises an aerosol generating substrate adapted to generate an inhalable aerosol when heated. [Background technology]

[0002] Aerosol-generating articles in which an aerosol-generating substrate, such as a tobacco-containing substrate, is heated rather than burned are known in the art. Typically, in such heated smoking articles, aerosols are generated by transferring heat from a heat source to a physically separated aerosol-generating substrate or material, which may be in contact with the heat source, located within the heat source, around the heat source, or downstream of the heat source. During use of the aerosol-generating article, volatile compounds are released from the aerosol-generating substrate by heat transfer from the heat source and entrained in the air drawn through the aerosol-generating article. As the released compounds cool, they condense to form aerosols.

[0003] Numerous prior art documents disclose aerosol generators for consuming aerosol-generating articles. Such devices include, for example, electrically heated aerosol generators in which aerosols are generated by heat transfer from one or more electric heater elements of the aerosol generator to an aerosol-generating substrate of a heated aerosol-generating article. For example, electrically heated aerosol generators have been proposed that include internal heater blades adapted to be inserted into an aerosol-generating substrate.

[0004] The use of aerosol-generating articles in combination with an external heating system is also known. For example, WO2020 / 115151 describes the provision of one or more heating elements arranged around the perimeter of an aerosol-generating article when the aerosol-generating article is received within the cavity of an aerosol-generating device. Alternatively, an inductively heatable aerosol-generating article comprising an aerosol-generating substrate and a susceptor disposed within the aerosol-generating substrate has been proposed by WO2015 / 176898.

[0005] Aerosol-generating articles in which the aerosol-generating substrate is heated rather than burned present a number of challenges not faced by conventional smoking articles. For example, in some aerosol-generating substrates, it may be difficult to deliver sufficient aerosol to the user.

[0006] It would be desirable to provide new and improved aerosol-generating articles. SUMMARY OF THE INVENTION

[0007] A cartridge for an aerosol-generating device is provided. The cartridge may comprise a housing. The housing may comprise a body. The body may extend between an upstream portion and a downstream portion. The upstream portion may comprise an inlet. The downstream portion may comprise an outlet. The body may define a chamber between the upstream portion and the downstream portion. The cartridge may comprise a heating element for forming an aerosol by heating an aerosol-forming substrate. The heating element may extend into the chamber. The chamber may comprise a first portion on a first side of the heating element and a second portion on a second side of the heating element. The cartridge may comprise an aerosol-generating substrate disposed within at least one of the first portion and the second portion. The body may have an internal area in an axial cross-section of from 40 square millimeters to 80 square millimeters. The body may have an outer perimeter in an axial cross-section of at least 30 millimeters. The ratio of the outer perimeter to the internal area may be at least 0.38.

[0008] A cartridge for an aerosol generating device is also provided. The cartridge comprises a body extending between an upstream portion and a downstream portion, the upstream portion having an inlet, the downstream portion having an outlet, and the body defining a chamber between the upstream and downstream portions; a housing comprising the body; a heating element for heating an aerosol-forming substrate to form an aerosol, the heating element extending into the chamber, the chamber comprising a first portion on a first side of the heating element and a second portion on a second side of the heating element; and an aerosol-generating substrate disposed in at least one of the first and second portions. The body has an internal area in an axial cross-section of from 40 square millimeters to 80 square millimeters and an outer perimeter of at least 30 millimeters, and a ratio of the outer perimeter to the internal area is at least 0.38.

[0009] A cartridge for an aerosol generating device is also provided. The cartridge comprises a body extending between an upstream portion and a downstream portion, the upstream portion having an inlet, the downstream portion having an outlet, and the body defining a chamber between the upstream and downstream portions; a housing comprising the body; a heating element for heating an aerosol-forming substrate to form an aerosol, the heating element extending at least partially around the chamber; and an aerosol-generating substrate disposed in the chamber. The body has an internal area in an axial cross-section of from 40 square millimeters to 80 square millimeters and an outer perimeter of at least 30 millimeters, and a ratio of the outer perimeter to the internal area is at least 0.38.

[0010] Cartridges for aerosol generators are also provided. The cartridge may comprise a housing. The housing may comprise a body. The body may extend between an upstream portion and a downstream portion. The upstream portion may comprise an inlet. The downstream portion may comprise an outlet. The body may define a chamber between the upstream portion and the downstream portion. The cartridge may comprise a heating element for forming an aerosol by heating an aerosol-forming substrate. The heating element may extend at least partially around the chamber. The cartridge may comprise an aerosol-forming substrate disposed within the chamber. The body may have dimensions in an axial cross-section: an internal area of ​​40 to 80 square millimeters. The body may have dimensions in an axial cross-section: an outer circumference of at least 30 millimeters. The ratio of the outer circumference to the internal area may be at least 0.38. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram of a cartridge according to one embodiment of the present disclosure. [Figure 2] This is a cross-sectional view of the cartridge shown in Figure 1, which does not have an aerosol generating substrate. [Figure 3] This is a cross-sectional view of the cartridge shown in Figure 1, which has an aerosol generating substrate. [Figure 4] This is a cross-sectional view of the cartridge in Figure 1, in a diagram that is perpendicular to the cross-sections in Figures 2 and 3. [Figure 5] This is a cross-sectional view of a system according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0012] Here, we will further describe the examples with reference to the figures.

[0013] The above and other features and advantages of the exemplary embodiments will become further apparent by describing the exemplary embodiments in detail with reference to the accompanying drawings. However, the details of certain structural and functional aspects disclosed herein are merely typical for the purpose of illustrating the exemplary embodiments. However, the exemplary embodiments may be embodied in numerous alternative forms and should not be construed as being limited to the embodiments described herein.

[0014] As a result, while exemplary embodiments are subject to various modifications and alternative forms, these embodiments are shown in the drawings as examples and are described in detail herein. However, it is not intended to limit the embodiments to any particular form disclosed; on the contrary, exemplary embodiments encompass all modifications, equivalents, and alternatives that fall within the scope of the exemplary embodiments.

[0015] Spatial relationship terms (e.g., “downward”) may be used herein to facilitate explanation, as shown in the figures, to describe the relationship between one element or feature and another. Naturally, spatial relationship terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, the element described as “downward” of the other element or feature will then be oriented “above” the other element or feature. Thus, the term “downward” may encompass both upward and downward orientations. The device may be oriented in other ways (by rotating 90 degrees or in other orientations), and the spatial relationship terms used herein should be interpreted accordingly.

[0016] The terms used herein are for illustrative purposes only and are not intended to limit the exemplary embodiments. The singular forms “a,” “an,” and “the” used herein are intended to include the plural, unless the context clearly indicates otherwise. The terms “includes,” “including,” “comprises,” and “comprising,” when used herein, identify the presence of the described feature, integer, process, operation, or element, but do not exclude the presence or addition of one or more other features, integers, processes, operations, elements, or groups thereof.

[0017] The exemplary embodiments are described herein with reference to perspective and section views that schematicly illustrate ideal embodiments (and intermediate structures) of the exemplary embodiments. Thus, variations from the exemplary shapes, for example, resulting from manufacturing techniques or tolerances, are to be expected. Accordingly, the exemplary embodiments should not be construed as limiting the shapes of the regions illustrated herein, and include, for example, deviations in shape resulting from manufacturing. The same reference numerals indicate the same elements throughout the drawings. The accompanying drawings should not be considered to be drawn to actual size unless otherwise specified. It will be understood that the drawings of this application are schematic and that some features have been omitted for clarity.

[0018] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as those generally understood by those skilled in the art to the extent of the exemplary embodiments. Furthermore, terms (including those defined in commonly used dictionaries) should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, unless expressly defined herein, and not as ideal or overly formal.

[0019] The accompanying drawings are intended to illustrate exemplary embodiments and should not be construed as limiting the intended claims.

[0020] Referring to Figure 1, a schematic diagram of a cartridge 10 according to one embodiment of the present disclosure is shown. The cartridge 10 is configured for use with an aerosol generator 600. As is best seen in Figures 2 and 3, the cartridge 10 comprises a housing 100, a planar heating element 200, and an aerosol generating substrate 300.

[0021] The housing 100 of the cartridge 10 is configured to protect, house, or support the components of the cartridge 10. The housing 100 of the cartridge is configured to house the aerosol generating substrate 300. The housing 100 is configured to hold the aerosol generating substrate 300 in contact with or in close proximity to the heating element 200 within the chamber 400. The housing 100 is a rigid housing. The housing 100 has an internal volume of 1300 cubic millimeters to 1500 cubic millimeters.

[0022] The housing 100 has an inlet 110, an outlet 120, and a chamber 400. The housing 100 has a distal end 101 and a proximal end 102. The housing 100 has an airflow path extending between the inlet 110 and the outlet 120. The housing 100 defines the inlet 110 and the outlet 120. The housing 100 is configured so that, during use, air can flow from the inlet 110 through the chamber 400 toward the outlet 120 and out through the outlet 120.

[0023] The inlet 110 is an air intake. The inlet 110 is located at the distal end 101. As is best seen in Figure 4, the inlet 110 comprises a plurality of inlet openings 111. The inlet openings 111 are evenly spaced apart from each other. The inlet openings 111 are substantially the same shape, size, and orientation as each other.

[0024] Outlet 120 is an aerosol outlet. Outlet 120 is located at the proximal end 102. Outlet 120 comprises a plurality of outlet openings 121. The outlet openings 121 are evenly spaced apart from each other. The outlet openings 121 have substantially the same shape, size, and orientation as each other.

[0025] The housing 100 has an upstream portion 130. The housing 100 has a downstream portion 140. The housing 100 has a main body 150.

[0026] The upstream portion 130 is located at the upstream end 101 of the cartridge 10. The upstream portion 130 is fixed to the body 150. The upstream portion 130 is fixed to the body 150 by a pressure fit. The upstream portion 130 includes an inlet 110. The inlet 110 is located inside the body 150. The upstream portion 130 is an upstream end cap. The upstream portion 130 extends into the body 150. The upstream portion 130 has a length of 3 to 4.5 millimeters (i.e., the dimension in the third direction 3). The upstream portion 130 may include a transparent or translucent material. The upstream portion 130 may include a plastic such as a high-temperature plastic.

[0027] The upstream portion 130 has an upstream portion base 135 and an upstream portion insert 136. The upstream portion base 135 is substantially outside the main body 150. The upstream portion base 135 has the same depth as the main body 150. The upstream portion base 135 has the same width as the main body 150.

[0028] The upstream insert 136 is attached to the upstream base 135. The upstream insert 136 is formed integrally with the upstream base 135. The upstream insert 136 extends from the upstream base 135 into the body 150. The upstream insert 136 is substantially located within the body 150. The upstream insert 136 defines the entrance 110. The upstream insert 136 has an outer wall that is substantially aligned with the inner wall of the body 150. The upstream insert 136 is positioned so that the upstream base 135 abuts against the end of the body 150. The upstream insert 136 is secured to the body 150 by an interference fit.

[0029] The downstream portion 140 is located at the downstream end 102 of the cartridge 10. The downstream portion 140 is fixed to the body 150. The downstream portion 140 is fixed to the body 150 by a pressure fit. The downstream portion 140 includes an outlet 120. The downstream portion 140 is a downstream end cap. The downstream portion 140 extends into the body 150. The downstream portion 140 is located downstream of the upstream portion 130. The downstream portion 140 has a length of 2.5 mm to 4 mm. The downstream portion 140 may include a transparent or translucent material. The downstream portion 140 may include a plastic such as a high-temperature plastic.

[0030] The downstream portion 140 comprises a downstream portion base 145 and a downstream portion insert 146. The downstream portion base 145 defines an outlet 120. The outlet 120 is aligned with the downstream end of the main body 150. The downstream portion base 145 is planar. The downstream portion base 145 is substantially outside the main body 150. The downstream portion base 145 has the same depth as the main body 150. The downstream portion base 145 has the same width as the main body 150.

[0031] The downstream insert 146 is attached to the downstream base 145. The downstream insert 146 is formed integrally with the downstream base 145. The downstream insert 146 extends from the downstream base 145 into the body 150. The downstream insert 146 is substantially hollow. The downstream insert 146 is tubular. The downstream insert 146 is substantially inside the body 150. The downstream insert 146 has an outer wall that is substantially aligned with the inner wall of the body 150. The downstream insert 146 is positioned such that the downstream base 145 abuts against the end of the body 150.

[0032] Chamber 400 extends between the inlet 110 and the outlet 120. Chamber 400 comprises a downstream cavity 440 defined by a downstream portion 140. The downstream cavity 440 is entirely within the downstream portion insert 146. The downstream cavity 440 has an internal volume of 70 cubic millimeters to 90 cubic millimeters. The heating element 200 extends only partially through the downstream cavity 440. The downstream cavity 440 comprises a first portion 441 on a first side surface of a plane defined by the planar heating element 200, and a second portion 442 on a second side surface of a plane defined by the planar heating element 200. Given that the heating element 200 extends only partially through the downstream cavity 440, the first portion 441 is only partially separated from the second portion 442 by the heating element 200. The first portion 441 of the downstream cavity 440 and the second portion 442 of the downstream cavity 440 have a total internal volume of 70 cubic millimeters to 90 cubic millimeters.

[0033] The main body 150 extends between the upstream portion 130 and the downstream portion 140. The main body 150 defines the chamber 400 between the downstream portion 140 and the upstream portion 130. The main body 150 has an external length of 16 to 18 millimeters. The main body 150 has an external width of 11.5 to 13 millimeters. The main body 150 has an external depth of 5 to 6.5 millimeters. The main body 150 has a surface area of ​​540 to 565 square millimeters. The main body 150 has walls with a wall thickness of 0.5 millimeters. The main body 150 has a substantially constant wall thickness along its length. The main body 150 has a substantially constant wall thickness along its width. The main body 150 has a substantially constant wall thickness along its depth. The main body 150 is substantially tubular. The main body 150 has a substantially rectangular cross-section along its long axis.

[0034] The main body 150 may contain at least one of the following: metal, alloy, plastic, high-temperature plastic, or plant material.

[0035] Chamber 400 is configured to store the aerosol generating substrate 300. Chamber 400 is located between the inlet 110 and the outlet 120. Chamber 400 is defined by the housing 100. The only openings to Chamber 400 are the inlet 110 and the outlet 120.

[0036] Chamber 400 comprises a first portion 410 and a second portion 420. The first portion 410 is located on the first side of the heating element 200, and the second portion 420 is located on the second side of the heating element 200. The first portion 410 and the second portion 420 have a combined internal volume of at least 500 cubic millimeters. The internal volume of the first portion 410 is substantially the same as that of the second portion 420. The first portion 410 is substantially the same as the second portion 420 in terms of shape, size, depth, width, length, and orientation. The first portion 410 and the second portion 420 are configured so that, in use, air can flow parallel to the outside from the inlet 110, through the aerosol generating substrates 310 and 320 of both portions of the chamber 410 and 420, toward the outlet 120, and out through the outlet 120. Specifically, the airflow branches after entering the inlet 110, passes through both the first section 410 and the second section 420, then merges and passes through the outlet 120.

[0037] A planar heating element 200 is configured to heat an aerosol-forming substrate to form an aerosol. The heating element 200 is a resistance heating element, configured to generate heat when a voltage is applied across it. The heating element 200 extends into the chamber 400. The heating element 200 extends into the chamber 400 from the upstream end to the downstream end so as to divide the chamber 400 into a first section 410 and a second section 420. The heating element 200 is positioned to substantially separate the first aerosol-generating substrate 310 and the second aerosol-generating substrate 320 from each other.

[0038] The heating element 200 is fixedly attached to the housing 100. The heating element 200 is fixedly attached to the distal end 101 of the housing 100. The heating element 200 is fixedly attached to the upstream section 130. The heating element 200 extends from the upstream section 130 through the chamber 400 toward the downstream section 140. The heating element 200 extends from the distal end 101 of the housing 100. The heating element 200 is embedded within the first upstream section 131 and the second upstream section 132 of the housing 100. The first upstream section 131 and the second upstream section 132 extend from the upstream section 130 to clamp or secure the heating element 200 to the upstream section 130. The heating element 200 extends through the aerosol generating substrate 300. The heating element 200 is in contact with the aerosol generating substrate 300.

[0039] The heating element 200 has a meandering shape. The heating element 200 includes a plurality of parallel segments extending along the chamber 400. The heating element 200 is a self-supporting track extending through the chamber 400. The heating element 200 is substantially or completely planar. The heating element 200 extends over at least 20%, preferably at least 40%, of the length of the chamber 400. The planar heating element 200 is oriented such that the plane of the heating element 200 aligns with the cartridge width. The planar heating element 200 is oriented such that the plane of the heating element 200 is parallel to the cartridge width direction 1.

[0040] The heating element 200 comprises a first electrical connection portion 211 and a second electrical connection portion 212. The electrical connection portions 211 and 212 are connected to the upstream portion 130. The electrical connection portions 211 and 212 are configured for electrical connection to a power supply. The electrical connection portions 211 and 212 are spaced apart from each other. The electrical connection portions 211 and 212 are spaced apart from each other in the width direction of the cartridge 10. The electrical connection portions 211 and 212 are located on the opposite sides of the chamber 400. The electrical connection portions 211 and 212 face the opposite sides of the upstream portion 130. Both electrical connection portions 211 and 212 are fixedly attached to the first upstream section 131 and the second upstream section 132.

[0041] The heating element 200 includes a meandering portion 213. The meandering portion 213 electrically connects a first electrical connection portion 211 to a second electrical connection portion 212. The meandering portion 213 is shaped such that the length near the central longitudinal axis of the cartridge 10 is greater than the length near the first electrical connection portion 211 or the second electrical connection portion 212. The meandering portion 213 is planar. The meandering portion 213 has a series of flat track portions that together define a plane.

[0042] The heating element 200 includes at least one of the following: an iron-based alloy, a nickel alloy, or a ceramic.

[0043] Each of the electrical connection portions 211 and 212 of the heating element 200 is electrically connected to the cartridge electrical contacts 221 and 222, as shown in Figure 5. The cartridge electrical contacts 211 and 212 are provided on the surface of the housing 100 at the downstream end 101 of the cartridge 10.

[0044] As shown in Figure 3, the aerosol generating substrate 300 comprises a first aerosol generating substrate 310 and a second aerosol generating substrate 320. The aerosol generating substrate 300 is arranged in the first and second parts of the chambers 410 and 420. The first aerosol generating substrate 310 is arranged in the first part 410 of the chamber 400. The second aerosol generating substrate 320 is arranged in the second part 420 of the chamber 400.

[0045] The aerosol generating substrate 300 may be one or more sheets of solid aerosol generating substrate. The solid aerosol generating substrate 300 may contain at least one aerosol forming body and at least one of tobacco and nicotine. The density of the solid aerosol generating substrate 300 in the chamber may be at least 0.3 milligrams per cubic millimeter of the chamber. The density of the solid aerosol generating substrate 300 in the chamber of the cartridge may be at least 0.5 milligrams per cubic millimeter of the chamber.

[0046] The aerosol generating substrate 300 may be a shredded aerosol generating substrate. The shredded aerosol generating substrate 300 may contain an aerosol forming body and at least one of tobacco and nicotine. The density of the shredded aerosol generating substrate 300 in the chamber may be at least 0.1 milligrams per cubic millimeter of the chamber. The cut width of the shredded aerosol generating substrate may be at least 0.3 millimeters. The shredded aerosol generating substrate may contain a cut filler. The aerosol generating substrate may contain homogenized tobacco material.

[0047] The aerosol generating substrate 300 may be a solid aerosol generating substrate. The solid aerosol generating substrate 300 may contain a plurality of particles, as well as at least one of tobacco and nicotine. The density of the solid aerosol generating substrate 300 in the chamber may be at least 0.3 milligrams per cubic millimeter of the chamber. The solid aerosol generating substrate may also be in powder form, and the powder may contain particles having a D50 size of 50 to 80 micrometers.

[0048] As is best seen in Figure 1, the housing has an external width 181 in the first direction 1. The housing has an external depth 182 in the second direction 2. The housing has an external length 183 in the third direction 3. The third direction 3 is the direction from the distal end 101 to the proximal end 102. The first direction 1, the second direction 2, and the third direction 3 are perpendicular to each other. The external length 183 of the housing is greater than the external width 181 of the housing. The external width 181 of the housing is greater than the external depth 182 of the housing.

[0049] The housing has an internal width 171 in a first direction 1. The housing has an internal depth 172 in a second direction 2. The housing has an internal length 173 in a third direction 3. The internal length 173 of the housing body is greater than the internal width 171 of the housing. The internal width 171 of the housing is greater than the internal depth 172 of the housing.

[0050] In the simple cartridge 10 that defines the internal chamber 400 of the cube, the total internal volume of the first part 410 and the second part 420 of the chamber 400 is V in the following formula T represented by: V T =(W I xD I xL I ) - V H where W I is the internal width 171 of the housing, D I is the internal depth 172 of the housing, L I is the internal length 173 of the housing body, and V H is the space within this volume (W I ×D I ×L I ) occupied by the heating element 200.

[0051] In the cartridge shown in FIG. 2, since a part of the main body 150 is occupied by the upstream part 130 and the downstream part 140 of the housing, the chamber 400 is not rectangular. In this case, the total internal volume of the first part 410 and the second part 420 is V in the following formula T represented by: V T =(W I xD I xL I ) - V U - V IL - V D - V H where W I is the internal width 171 of the housing body, D I is the internal depth 172 of the housing body, L I is the internal length 173 of the housing body, V U is the volume within the volume (W I ×D I ×L I ) occupied by the upstream part 130, and V IL is the volume occupied by the inlet 110 within the volume (W I ×D I×L I It is the space within ) and V D The volume (W) is occupied by the downstream portion 140. I ×D I ×L I ) is the space within and V H The volume (W) occupied by the heating element 200 I ×D I ×L I It is the space within the parentheses.

[0052] Total internal volume V T This is the space within the cartridge 10 configured to receive the aerosol generating substrate 300. The total internal volume of the chamber 400 may be partially or completely filled with the aerosol generating substrate 300. The total internal volume of the chamber 400 may be divided entirely or partially into two sections by the heating element 200.

[0053] The main body 150 has dimensions in an axial cross-section: an internal area of ​​10 to 300 square millimeters and a perimeter of at least 30 millimeters. The ratio between the perimeter and the internal area is at least 0.5.

[0054] The internal area in the axial cross-section is represented by A in the following equation for cartridge 10 having a rectangular cross-section as shown in the figure: A=W I xD I In the formula, W I The internal width of the housing in cross-section is 171, and D I The internal depth of the housing in cross-section is 172.

[0055] For a cartridge 10 having a rectangular cross-section as shown in the figure, the outer circumference in the axial direction is represented by P in the following equation: P=2D E +2W E In the formula, D E The external depth of the housing in cross-section is 182, and W E This is the external width of the housing in cross-section, which is 181.

[0056] The cartridge 10 shown in the figure has a substantially constant cross-section along its length 183. For the cartridge shown in the figure, values ​​A and P are constant along most of the cartridge's external length 183 between the upstream portion 130 and the downstream portion 140. Specifically, values ​​A and P are the same regardless of whether the cross-section is taken in a plane near the upstream end 101 or a plane near the downstream end 102 of the cartridge 10.

[0057] The cross-sectional area of ​​the heating element in the plane on which it extends is between 60 square millimeters and 90 square millimeters.

[0058] The cross-sectional area of ​​the chamber 400 in the plane on which the planar heating element 200 extends is 150 square millimeters to 250 square millimeters.

[0059] The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber 400 in the plane on which the planar heating element extends is at least 0.3.

[0060] The cross-sectional area of ​​the chamber 400 in the plane on which the planar heating element 200 extends is approximately the same as the housing internal length multiplied by the housing internal width 171. The housing internal length is the housing internal length 173 minus the length of the upstream or downstream portion that extends into the housing body 150 to occupy the space in the plane of the heating element 200. Referring to Figure 2, the upstream portion 130 occupies more space in the plane of the heating element 200 within the housing body 150 than the downstream portion 140.

[0061] Referring to Figure 4, the cross-sectional area of ​​the chamber 400 in the plane on which the planar heating element 200 extends is given by the following equation A x Represented as: A x =(W I XL I )-A D -A U In the formula, W IL is the internal width 171 of the housing in a planar cross-section on which the planar heating element extends. I This is the internal length 173 of the housing body in a planar cross-section on which the planar heating element extends, and A D This is the region W occupied by the downstream portion 140. I ×L I It is an area within A U This is the region W occupied by the upstream portion 130. I ×L I It is an internal area.

[0062] The device 600 comprises a main body 610, a device cavity, and a lid 611. As shown in Figure 5, the cartridge 10 is configured to be received within the device cavity of the main body 610 and within the lid 611 of the device 600. The lid 611 is configured to move between an open position and a closed position. When the lid 611 is in the open position, the cartridge 10 can be inserted into or removed from the device cavity. When the lid 611 is in the closed position, the cartridge 10 is fixed within the device 600. When the lid 611 is in the closed position, the cartridge 10 is housed within the device cavity, surrounded by the lid 611 and the main body 610 of the device 600.

[0063] The device 600 includes an inlet 608, an outlet 609, a power supply 630, a controller 640, electrical contacts 621 and 622, and a mouthpiece 612. The main body 610 includes an inlet 608, a power supply 630, a controller 640, and electrical contacts 621 and 622. The lid 611 includes a mouthpiece 612 and an outlet 609.

[0064] The inlet 608 is located inside the main body 610 of the device. The inlet 608 is located at the distal end of the device 600. The inlet 608 is an air intake. The outlet 609 is located inside the mouthpiece 612. The outlet 609 is located at the proximal end of the device 600. The outlet 609 is an aerosol outlet.

[0065] The housing 100 of the cartridge 10 is configured to be attached to the device 600 at the distal end 101 of the housing 100. The cartridge 10 and the device 600 are configured such that when the device 600 and the cartridge 10 are mechanically connected, the electrical contacts 221 and 222 of the cartridge are electrically connected to the corresponding electrical contacts 621 and 622 of the device 600. The electrical contacts 621 and 622 of the device 600 are electrically connected to the power supply 630 so that power can be supplied from the power supply 630 to the heating element 200. The power supply 630 is in the form of a battery, which in this embodiment is a rechargeable lithium-ion battery.

[0066] The device 600 includes a controller 640 electrically connected to a power supply 630. The controller 640 is configured to control the power output from the power supply 630, control whether the heating element 200 is on or off, and control the temperature of the heating element 200.

[0067] During use, air enters the air intake port 608, passes through the main body of the device 610, enters the air intake port 110 of the cartridge 10, and passes through the aerosol generating substrates 310 and 320 around the heating element 200, at which point an aerosol is formed. The aerosol is carried by the airflow to the outlet 120 of the cartridge 100, and then flows to the aerosol outlet 609 of the mouthpiece. The user can inhale through the mouthpiece 612 and receive the aerosol from the aerosol outlet 609.

[0068] For the purposes of this specification and the appended claims, unless otherwise indicated, all numerical values ​​representing quantities, amounts, percentages, etc., should be understood in all examples as being modified by the term “approximately.” Furthermore, all ranges include the disclosed maximum and minimum points and any intermediate ranges therewith, which may or may not be specifically listed herein. Thus, in this context, the number A is understood as A ± 10%. In this context, the number A may be considered to include numerical values ​​that fall within the general standard error to the measured value of the characteristic that the number A modifies. In some examples used in the appended claims, the number A may deviate by the percentages listed above, as long as the amount of deviation from A does not substantially affect the basic and novel characteristics of the invention described in the claims. Furthermore, all ranges include the disclosed maximum and minimum points and any intermediate ranges therewith, which may or may not be specifically listed herein.

[0069] The inventors have found that one advantageous method for efficiently heating an aerosol generating substrate is to separate the aerosol generating substrate into two parts and place the portions of the aerosol generating substrate on both sides of a heating element.

[0070] The shape and configuration of the cartridge allow for easy handling by the user, while also providing an aerosol generating substrate that is close to the heating element so that the aerosol generating substrate is efficiently heated.

[0071] As used herein, the term "aerosol generator" refers to a device that interacts with a liquid aerosol-forming substrate to generate an aerosol.

[0072] As used herein, the term "cartridge" refers to a component that interacts with an aerosol-forming device in order to generate an aerosol.

[0073] As used herein, the term “aerosol-generating substrate” refers to a substrate having the ability to release volatile compounds that can form aerosols. Such volatile compounds can be released by heating the aerosol-generating substrate.

[0074] As used herein, the term “heating element” refers to a component that transfers thermal energy to a liquid aerosol-forming substrate.

[0075] The chamber may comprise a first portion on the first side surface of the heating element and a second portion on the second side surface of the heating element.

[0076] The first and second parts of the chamber may have a total internal volume of at least 100 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 150 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 200 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 250 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 300 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 350 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 400 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 450 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 500 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 520 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 540 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 560 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 580 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 600 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 650 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 700 cubic millimeters. The first and second parts of the chamber may have a total internal volume of at least 700 cubic millimeters.The first and second parts of the chamber may have a combined internal volume of at least 750 cubic millimeters. The first and second parts of the chamber may have a combined internal volume of at least 800 cubic millimeters.

[0077] The first and second parts of the chamber may have a total internal volume of 2000 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1900 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1800 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1700 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1600 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1500 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1400 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1300 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1200 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1150 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1100 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1050 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 1000 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 950 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 900 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 850 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 800 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 750 cubic millimeters or less.The first and second parts of the chamber may have a total internal volume of 740 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 720 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 700 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 680 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 660 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 640 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 620 cubic millimeters or less. The first and second parts of the chamber may have a total internal volume of 600 cubic millimeters or less.

[0078] The first and second parts of the chamber may have a total internal volume of 100 cubic millimeters to 2000 cubic millimeters. The first and second parts of the chamber may have a total internal volume of 200 cubic millimeters to 1800 cubic millimeters. The first and second parts of the chamber may have a total internal volume of 300 cubic millimeters to 1600 cubic millimeters. The first and second parts of the chamber may have a total internal volume of 350 cubic millimeters to 1400 cubic millimeters. The first and second parts of the chamber may have a total internal volume of 400 cubic millimeters to 1200 cubic millimeters. The first and second parts of the chamber may have a total internal volume of 450 cubic millimeters to 1000 cubic millimeters. The first and second parts of the chamber may have a total internal volume of 500 cubic millimeters to 800 cubic millimeters. The first and second parts of the chamber may have a total internal volume of 560 cubic millimeters to 700 cubic millimeters. The first and second parts of the chamber may have a total internal volume of 580 cubic millimeters to 680 cubic millimeters. The first and second parts of the chamber may have a total internal volume of 600 cubic millimeters to 660 cubic millimeters. The first and second parts of the chamber may have a total internal volume of 620 cubic millimeters to 640 cubic millimeters.

[0079] The first and second parts may have a length of at least 8 millimeters. The first and second parts may have a length of at least 8.5 millimeters. The first and second parts may have a length of at least 9 millimeters. The first and second parts may have a length of at least 9.5 millimeters.

[0080] The first and second parts may have a length of 11 millimeters or less. The first and second parts may have a length of 10.5 millimeters or less. The first and second parts may have a length of 10 millimeters or less.

[0081] The first and second parts may have a length of 8 to 11 millimeters. The first and second parts may have a length of 8.5 to 10.5 millimeters. The first and second parts may have a length of 9 to 10 millimeters.

[0082] The first and second parts may have a width of at least 10 millimeters. The first and second parts may have a width of at least 10.5 millimeters. The first and second parts may have a width of at least 11 millimeters.

[0083] The first and second parts may have a width of 13 millimeters or less. The first and second parts may have a width of 12.5 millimeters or less. The first and second parts may have a width of 12 millimeters or less. The first and second parts may have a width of 11.5 millimeters or less.

[0084] The first and second parts may have a width of 10 to 13 millimeters. The first and second parts may have a width of 10.5 to 12.5 millimeters. The first and second parts may have a width of 11 to 12 millimeters.

[0085] The first and second parts may have a depth of at least 5 millimeters. The first and second parts may have a depth of at least 5.5 millimeters. The first and second parts may have a depth of at least 5.7 millimeters.

[0086] The first and second parts may have a depth of 7 millimeters or less. The first and second parts may have a depth of 6.5 millimeters or less. The first and second parts may have a depth of 6 millimeters or less. The first and second parts may have a depth of 5.7 millimeters or less.

[0087] The first and second parts may have a depth of 5 to 6 millimeters.

[0088] The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of at least 510 cubic millimeters. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of at least 530 cubic millimeters. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of at least 550 cubic millimeters. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of at least 570 cubic millimeters. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of at least 590 cubic millimeters.

[0089] The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of 690 cubic millimeters or less. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of 670 cubic millimeters or less. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of 650 cubic millimeters or less. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of 630 cubic millimeters or less. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of 610 cubic millimeters or less.

[0090] The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of 530 cubic millimeters to 670 cubic millimeters. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of 550 cubic millimeters to 650 cubic millimeters. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of 570 cubic millimeters to 630 cubic millimeters. The first and second parts of the chamber may be configured to accommodate an aerosol generating substrate having a total volume of 590 cubic millimeters to 610 cubic millimeters.

[0091] The first part of the chamber may have a volume of at least 250 cubic millimeters. The first part of the chamber may have a volume of at least 270 cubic millimeters. The first part of the chamber may have a volume of at least 290 cubic millimeters.

[0092] The first part of the chamber may have a volume of 330 cubic millimeters or less. The first part of the chamber may have a volume of 310 cubic millimeters or less. The first part of the chamber may have a volume of 290 cubic millimeters or less.

[0093] The first part of the chamber may have a volume of 250 cubic millimeters to 330 cubic millimeters. The first part of the chamber may have a volume of 270 cubic millimeters to 310 cubic millimeters.

[0094] The first part may have a length of at least 8 millimeters. The first part may have a length of at least 8.5 millimeters. The first part may have a length of at least 9 millimeters. The first part may have a length of at least 9.5 millimeters.

[0095] The first part may have a length of 11 millimeters or less. The first part may have a length of 10.5 millimeters or less. The first part may have a length of 10 millimeters or less.

[0096] The first part may have a length of 8 to 11 millimeters. The first part may have a length of 8.5 to 10.5 millimeters. The first part may have a length of 9 to 10 millimeters.

[0097] The first part may have a width of at least 10 millimeters. The first part may have a width of at least 10.5 millimeters. The first part may have a width of at least 11 millimeters.

[0098] The first part may have a width of 13 millimeters or less. The first part may have a width of 12.5 millimeters or less. The first part may have a width of 12 millimeters or less. The first part may have a width of 11.5 millimeters or less.

[0099] The first part may have a width of 10 to 13 millimeters. The first part may have a width of 10.5 to 12.5 millimeters. The first part may have a width of 11 to 12 millimeters.

[0100] The second part of the chamber may have a volume of at least 250 cubic millimeters. The second part of the chamber may have a volume of at least 270 cubic millimeters. The second part of the chamber may have a volume of at least 290 cubic millimeters.

[0101] The second part of the chamber may have a volume of 330 cubic millimeters or less. The second part of the chamber may have a volume of 310 cubic millimeters or less. The second part of the chamber may have a volume of 290 cubic millimeters or less.

[0102] The second part of the chamber may have a volume of 250 cubic millimeters to 330 cubic millimeters. The second part of the chamber may have a volume of 270 cubic millimeters to 310 cubic millimeters.

[0103] The second part may have a length of at least 8 millimeters. The second part may have a length of at least 8.5 millimeters. The second part may have a length of at least 9 millimeters. The second part may have a length of at least 9.5 millimeters.

[0104] The second part may have a length of 11 millimeters or less. The second part may have a length of 10.5 millimeters or less. The second part may have a length of 10 millimeters or less.

[0105] The second part may have a length of 8 to 11 millimeters. The second part may have a length of 8.5 to 10.5 millimeters. The second part may have a length of 9 to 10 millimeters.

[0106] The second part may have a width of at least 10 millimeters. The second part may have a width of at least 10.5 millimeters. The second part may have a width of at least 11 millimeters.

[0107] The second part may have a width of 13 millimeters or less. The second part may have a width of 12.5 millimeters or less. The second part may have a width of 12 millimeters or less. The second part may have a width of 11.5 millimeters or less.

[0108] The second part may have a width of 10 to 13 millimeters. The second part may have a width of 10.5 to 12.5 millimeters. The second part may have a width of 11 to 12 millimeters.

[0109] The housing may have an external volume of at least 1300 cubic millimeters. The housing may have an external volume of at least 1320 cubic millimeters. The housing may have an external volume of at least 1340 cubic millimeters. The housing may have an external volume of at least 1360 cubic millimeters. The housing may have an external volume of at least 1380 cubic millimeters. The housing may have an external volume of at least 1400 cubic millimeters.

[0110] The housing may have an external volume of 1500 cubic millimeters or less. The housing may have an external volume of 1480 cubic millimeters or less. The housing may have an external volume of 1460 cubic millimeters or less. The housing may have an external volume of 1440 cubic millimeters or less. The housing may have an external volume of 1420 cubic millimeters or less. The housing may have an external volume of 1400 cubic millimeters or less.

[0111] The housing may have an external volume of 1300 cubic millimeters to 1500 cubic millimeters. The housing may have an external volume of 1320 cubic millimeters to 1480 cubic millimeters. The housing may have an external volume of 1340 cubic millimeters to 1460 cubic millimeters. The housing may have an external volume of 1360 cubic millimeters to 1440 cubic millimeters. The housing may have an external volume of 1380 cubic millimeters to 1420 cubic millimeters.

[0112] The housing may extend between the entrance and the exit.

[0113] The housing may define a chamber. The housing may define a chamber between the inlet and the outlet. The housing may define a chamber between the upstream and downstream portions.

[0114] The housing may have an external length of at least 16 millimeters. The housing may have an external length of at least 16.5 millimeters. The housing may have an external length of at least 17 millimeters. The housing may have an external length of at least 17.5 millimeters. The housing may have an external length of at least 17 millimeters. The housing may have an external length of at least 17 millimeters.

[0115] The housing may have an external length of 20 mm or less. The housing may have an external length of 19.5 mm or less. The housing may have an external length of 19 mm or less. The housing may have an external length of 18.5 mm or less. The housing may have an external length of 18 mm or less. The housing may have an external length of 17.5 mm or less. The housing may have an external length of 17 mm or less.

[0116] The housing may have an external length of 16 to 20 millimeters.

[0117] The housing may have an external width of at least 11.5 millimeters. The housing may have an external width of at least 12 millimeters.

[0118] The housing may have an external width of 13 mm or less. The housing may have an external width of 12.5 mm or less. The housing may have an external width of 12 mm or less.

[0119] The housing may have an external width of 11.5 mm to 13 mm.

[0120] The housing may have an external depth of at least 5 millimeters. The housing may have an external depth of at least 5.5 millimeters. The housing may have an external depth of at least 6 millimeters.

[0121] The housing may have an external depth of 6.5 mm or less. The housing may have an external depth of 6 mm or less. The housing may have an external depth of 5.5 mm or less.

[0122] The housing may have an external depth of 5 mm to 6.5 mm.

[0123] The chamber may be configured to store the aerosol generating substrate.

[0124] The first part of the chamber may have substantially the same internal volume as the second part.

[0125] The first part of the chamber may have substantially the same shape as the second part of the chamber.

[0126] The first part of the chamber may have substantially the same size as the second part of the chamber. The first part of the chamber may have substantially the same length as the second part of the chamber. The first part of the chamber may have substantially the same width as the second part of the chamber. The first part of the chamber may have substantially the same depth as the second part of the chamber.

[0127] The first part of the chamber and the second part of the chamber may be positioned relative to each other on opposing sides of the heating element.

[0128] The housing may be a rigid housing. The housing may be formed from a rigid material.

[0129] The housing may include an upstream section. The housing may include a downstream section. The housing may include a main body.

[0130] The upstream section may be detachably attached to the main body. The downstream section may be detachably attached to the main body. The upstream section may be fixed to the main body. The downstream section may be fixed to the main body.

[0131] The chamber may extend between the upstream and downstream sections. The chamber may be defined by the upstream section, the downstream section, and the main body.

[0132] The upstream portion can be located at the upstream end of the cartridge.

[0133] The upstream section may be equipped with an inlet. The upstream section may also be equipped with an upstream end cap.

[0134] The upstream portion may have a length of at least 3 millimeters. The upstream portion may have a length of at least 3.5 millimeters. The upstream portion may have a length of at least 4 millimeters.

[0135] The upstream portion may have a length of 4.5 millimeters or less. The upstream portion may have a length of 4 millimeters or less. The upstream portion may have a length of 3.5 millimeters or less.

[0136] The upstream portion may have a length of 3 to 4.5 millimeters.

[0137] The upstream portion may extend into the main body.

[0138] The upstream portion may have an external volume of at least 140 cubic millimeters. The upstream portion may have an external volume of at least 145 cubic millimeters. The upstream portion may have an external volume of at least 150 cubic millimeters.

[0139] The upstream portion may have an external volume of 160 cubic millimeters or less. The upstream portion may have an external volume of 155 cubic millimeters or less. The upstream portion may have an external volume of 150 cubic millimeters or less.

[0140] The upstream portion may have an external volume of 140 cubic millimeters to 160 cubic millimeters. The upstream portion may have an external volume of 145 cubic millimeters to 155 cubic millimeters.

[0141] The downstream portion may be located at the downstream end of the cartridge.

[0142] The downstream section may be equipped with an outlet. The downstream section may also be equipped with a downstream end cap.

[0143] The downstream portion may have a length of at least 2.5 millimeters. The downstream portion may have a length of at least 3 millimeters. The downstream portion may have a length of at least 3.5 millimeters.

[0144] The downstream portion may have a length of 4 millimeters or less. The downstream portion may have a length of 3.5 millimeters or less. The downstream portion may have a length of 3 millimeters or less.

[0145] The downstream portion may have a length of 2.5 to 4 millimeters.

[0146] The downstream portion may extend into the main body. The downstream portion may extend into the main body, and the chamber may have a downstream cavity defined by the downstream portion.

[0147] The downstream portion may have an external volume of at least 90 cubic millimeters. The downstream portion may have an external volume of at least 95 cubic millimeters. The downstream portion may have an external volume of at least 100 cubic millimeters.

[0148] The downstream portion may have an external volume of 110 cubic millimeters or less. The downstream portion may have an external volume of 105 cubic millimeters or less. The downstream portion may have an external volume of 100 cubic millimeters or less.

[0149] The downstream portion may have an external volume of 90 cubic millimeters to 110 cubic millimeters. The downstream portion may have an external volume of 95 cubic millimeters to 105 cubic millimeters.

[0150] The downstream cavity may have an internal volume of at least 70 cubic millimeters. The downstream cavity may have an internal volume of at least 75 cubic millimeters. The downstream cavity may have an internal volume of at least 80 cubic millimeters.

[0151] The downstream cavity may have an internal volume of 90 cubic millimeters or less. The downstream cavity may have an internal volume of 85 cubic millimeters or less. The downstream cavity may have an internal volume of 80 cubic millimeters or less.

[0152] The downstream cavity may have an internal volume of 70 cubic millimeters to 90 cubic millimeters. The downstream cavity may have an internal volume of 75 cubic millimeters to 85 cubic millimeters.

[0153] The downstream cavity may comprise a first section on the first side surface of the heating element and a second section on the second side surface of the heating element.

[0154] The first section of the downstream cavity may have an internal volume of at least 30 cubic millimeters. The first section of the downstream cavity may have an internal volume of at least 35 cubic millimeters. The first section of the downstream cavity may have an internal volume of at least 40 cubic millimeters.

[0155] The first section of the downstream cavity may have an internal volume of 50 cubic millimeters or less. The first section of the downstream cavity may have an internal volume of 45 cubic millimeters or less. The first section of the downstream cavity may have an internal volume of 40 cubic millimeters or less.

[0156] The first section of the downstream cavity may have an internal volume of 30 cubic millimeters to 50 cubic millimeters. The first section of the downstream cavity may have an internal volume of 35 cubic millimeters to 45 cubic millimeters.

[0157] The second section of the downstream cavity may have an internal volume of at least 30 cubic millimeters. The second section of the downstream cavity may have an internal volume of at least 35 cubic millimeters. The second section of the downstream cavity may have an internal volume of at least 40 cubic millimeters.

[0158] The second section of the downstream cavity may have an internal volume of 50 cubic millimeters or less. The second section of the downstream cavity may have an internal volume of 45 cubic millimeters or less. The second section of the downstream cavity may have an internal volume of 40 cubic millimeters or less.

[0159] The second section of the downstream cavity may have an internal volume of 30 cubic millimeters to 50 cubic millimeters. The second section of the downstream cavity may have an internal volume of 35 cubic millimeters to 45 cubic millimeters.

[0160] The first section of the downstream cavity and the second section of the downstream cavity may have a total internal volume of at least 70 cubic millimeters. The first section of the downstream cavity and the second section of the downstream cavity may have a total internal volume of at least 75 cubic millimeters. The first section of the downstream cavity and the second section of the downstream cavity may have a total internal volume of at least 80 cubic millimeters.

[0161] The first section of the downstream cavity and the second section of the downstream cavity may have a total internal volume of 90 cubic millimeters or less. The first section of the downstream cavity and the second section of the downstream cavity may have a total internal volume of 85 cubic millimeters or less. The first section of the downstream cavity and the second section of the downstream cavity may have a total internal volume of 80 cubic millimeters or less.

[0162] The first section of the downstream cavity and the second section of the downstream cavity may have a total internal volume of 70 cubic millimeters to 90 cubic millimeters.

[0163] The main body may extend between the upstream and downstream sections.

[0164] The main body may define a chamber. The main body may define a chamber between the upstream and downstream sections.

[0165] The main body may have an external length of at least 16 millimeters. The main body may have an external length of at least 16.5 millimeters. The main body may have an external length of at least 17 millimeters.

[0166] The main body may have an external length of 18 mm or less. The main body may have an external length of 17.5 mm or less. The main body may have an external length of 17 mm or less.

[0167] The main body may have an external length of 16 to 18 millimeters.

[0168] The main body may have an external width of at least 11.5 millimeters. The main body may have an external width of at least 12 millimeters.

[0169] The main body may have an external width of 13 millimeters or less. The main body may have an external width of 12.5 millimeters or less. The main body may have an external width of 12 millimeters or less.

[0170] The main body may have an external width of 11.5 mm to 13 mm.

[0171] The main body may have an external depth of at least 5 millimeters. The main body may have an external depth of at least 5.5 millimeters. The main body may have an external depth of at least 6 millimeters.

[0172] The main body may have an external depth of 6.5 mm or less. The main body may have an external depth of 6 mm or less. The main body may have an external depth of 5.5 mm or less.

[0173] The main body may have an external depth of 5 mm to 6.5 mm.

[0174] The body may have an internal cross-sectional area of ​​at least 10 square millimeters. The body may have an internal cross-sectional area of ​​at least 15 square millimeters. The body may have an internal cross-sectional area of ​​at least 20 square millimeters. The body may have an internal cross-sectional area of ​​at least 25 square millimeters. The body may have an internal cross-sectional area of ​​at least 30 square millimeters. The body may have an internal cross-sectional area of ​​at least 35 square millimeters. The body may have an internal cross-sectional area of ​​at least 40 square millimeters. The body may have an internal cross-sectional area of ​​at least 45 square millimeters. The body may have an internal cross-sectional area of ​​at least 50 square millimeters. The body may have an internal cross-sectional area of ​​at least 51 square millimeters. The body may have an internal cross-sectional area of ​​at least 53 square millimeters. The body may have an internal cross-sectional area of ​​at least 55 square millimeters. The body may have an internal cross-sectional area of ​​at least 57 square millimeters.

[0175] The main body may have an internal cross-sectional area of ​​300 square millimeters or less. The main body may have an internal cross-sectional area of ​​280 square millimeters or less. The main body may have an internal cross-sectional area of ​​260 square millimeters or less. The main body may have an internal cross-sectional area of ​​240 square millimeters or less. The main body may have an internal cross-sectional area of ​​220 square millimeters or less. The main body may have an internal cross-sectional area of ​​200 square millimeters or less. The main body may have an internal cross-sectional area of ​​180 square millimeters or less. The main body may have an internal cross-sectional area of ​​160 square millimeters or less. The main body may have an internal cross-sectional area of ​​140 square millimeters or less. The main body may have an internal cross-sectional area of ​​120 square millimeters or less. The main body may have an internal cross-sectional area of ​​100 square millimeters or less. The main body may have an internal cross-sectional area of ​​90 square millimeters or less. The main body may have an internal cross-sectional area of ​​80 square millimeters or less. The main body may have an internal cross-sectional area of ​​70 square millimeters or less. The main body may have an internal cross-sectional area of ​​69 square millimeters or less. The main body may have an internal cross-sectional area of ​​67 square millimeters or less. The main body may have an internal cross-sectional area of ​​65 square millimeters or less. The main body may have an internal cross-sectional area of ​​63 square millimeters or less. The main body may have an internal cross-sectional area of ​​61 square millimeters or less. The main body may have an internal cross-sectional area of ​​59 square millimeters or less. The main body may have an internal cross-sectional area of ​​57 square millimeters or less.

[0176] The main body may have an internal cross-sectional area of ​​40 square millimeters to 80 square millimeters.

[0177] The main body may have an internal cross-sectional area of ​​10 square millimeters to 300 square millimeters. The main body may have an internal cross-sectional area of ​​15 square millimeters to 260 square millimeters. The main body may have an internal cross-sectional area of ​​20 square millimeters to 220 square millimeters. The main body may have an internal cross-sectional area of ​​25 square millimeters to 180 square millimeters. The main body may have an internal cross-sectional area of ​​30 square millimeters to 160 square millimeters. The main body may have an internal cross-sectional area of ​​35 square millimeters to 120 square millimeters. The main body may have an internal cross-sectional area of ​​40 square millimeters to 100 square millimeters. The main body may have an internal cross-sectional area of ​​45 square millimeters to 80 square millimeters. The main body may have an internal cross-sectional area of ​​50 square millimeters to 70 square millimeters. The main body may have an internal cross-sectional area of ​​50 square millimeters to 69 square millimeters. The main body may have an internal cross-sectional area of ​​50 square millimeters to 67 square millimeters. The main body may have an internal cross-sectional area of ​​50 square millimeters to 65 square millimeters. The main body may have an internal cross-sectional area of ​​51 square millimeters to 63 square millimeters. The main body may have an internal cross-sectional area of ​​53 square millimeters to 61 square millimeters. The main body may have an internal cross-sectional area of ​​55 square millimeters to 59 square millimeters.

[0178] The internal cross-sectional area of ​​the main body may be measured using the axial cross-section of the main body.

[0179] The internal cross-sectional area of ​​the body may extend over at least 50 percent of the length of the body. The internal cross-sectional area of ​​the body may extend over at least 80 percent of the length of the body. The internal cross-sectional area of ​​the body may extend over 100 percent of the length of the body.

[0180] The body may have an outer circumference of at least 30 mm. The body may have an outer circumference of at least 31 mm. The body may have an outer circumference of at least 32 mm. The body may have an outer circumference of at least 33 mm. The body may have an outer circumference of at least 34 mm.

[0181] The main body may have an outer circumference of 40 mm or less. The main body may have an outer circumference of 39 mm or less. The main body may have an outer circumference of 38 mm or less. The main body may have an outer circumference of 37 mm or less. The main body may have an outer circumference of 36 mm or less. The main body may have an outer circumference of 35 mm or less.

[0182] The main body may have an outer circumference of 30 to 40 mm. The main body may have an outer circumference of 30 to 39 mm. The main body may have an outer circumference of 31 to 38 mm. The main body may have an outer circumference of 32 to 37 mm. The main body may have an outer circumference of 33 to 36 mm. The main body may have an outer circumference of 34 to 35 mm.

[0183] The outer circumference of the main body may be measured at the same point where the internal cross-sectional area of ​​the main body is measured.

[0184] The outer circumference of the main body may be measured using the axial cross-section of the main body.

[0185] The outer circumference of the main body may be the average outer circumference over at least 50 percent of the main body. The outer circumference of the main body may be the average outer circumference over at least 80 percent of the main body. The outer circumference of the main body may be the average outer circumference of the main body.

[0186] The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.2. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.22. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.24. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.26. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.28. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.3. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.32. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.34. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.36. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.38. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.4. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.42. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.44. The ratio of the outer circumference of the main body to the internal cross-sectional area of ​​the main body may be at least 0.45.

[0187] The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.6 or less. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.58 or less. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.56 or less. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.54 or less. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.52 or less. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.5 or less. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.48 or less. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.46 or less. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.45 or less.

[0188] The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.2 to 0.6. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.22 to 0.58. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.24 to 0.56. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.26 to 0.54. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.28 to 0.52. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.3 to 0.5. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.32 to 0.48. The ratio of the outer circumference to the internal cross-sectional area of ​​the main body may be 0.34 to 0.46.

[0189] The main body may have an external surface area of ​​at least 530 square millimeters. The main body may have an external surface area of ​​at least 535 square millimeters. The main body may have an external surface area of ​​at least 540 square millimeters. The main body may have an external surface area of ​​at least 545 square millimeters. The main body may have an external surface area of ​​at least 550 square millimeters.

[0190] The main body may have an external surface area of ​​570 square millimeters or less. The main body may have an external surface area of ​​565 square millimeters or less. The main body may have an external surface area of ​​560 square millimeters or less. The main body may have an external surface area of ​​555 square millimeters or less. The main body may have an external surface area of ​​550 square millimeters or less.

[0191] The main body may have an external surface area of ​​530 square millimeters to 570 square millimeters. The main body may have an external surface area of ​​535 square millimeters to 565 square millimeters. The main body may have an external surface area of ​​540 square millimeters to 560 square millimeters. The main body may have an external surface area of ​​545 square millimeters to 555 square millimeters.

[0192] The main body may be tubular in shape.

[0193] The entrance may have one or more openings. The entrance may have multiple openings.

[0194] The outlet may have one or more openings. The outlet may have multiple openings.

[0195] The cartridge may include an airflow path extending between the inlet and the outlet.

[0196] The housing may include an airflow path extending between the inlet and the outlet.

[0197] The heating element may be a flat heating element. The heating element may be a resistance heating element.

[0198] The heating element may extend around at least 50 percent of the chamber. The heating element may extend around at least 60 percent of the chamber. The heating element may extend around at least 70 percent of the chamber. The heating element may extend around at least 80 percent of the chamber. The heating element may extend around at least 90 percent of the chamber. The heating element may extend around at least 95 percent of the chamber. The heating element may extend around 100 percent of the chamber.

[0199] The heating element may extend around 95 percent or less of the chamber. The heating element may extend around 90 percent or less of the chamber. The heating element may extend around 80 percent or less of the chamber. The heating element may extend around 70 percent or less of the chamber.

[0200] The heating element may extend completely around the chamber. The heating element may extend around the inside of the chamber. The heating element may extend around the periphery of the chamber.

[0201] The heating element may extend around the inner surface of the chamber. The heating element may be mounted around the perimeter of the chamber. The heating element may be mounted on the inner surface of the chamber. The heating element may be part of the housing. The heating element may be formed integrally with the housing or formed within the housing.

[0202] The heating element may extend around at least 50 percent of the chamber's internal surface area. The heating element may extend around at least 60 percent of the chamber's internal surface area. The heating element may extend around at least 70 percent of the chamber's internal surface area. The heating element may extend around at least 80 percent of the chamber's internal surface area. The heating element may extend around at least 90 percent of the chamber's internal surface area. The heating element may extend around at least 95 percent of the chamber's internal surface area. The heating element may extend around 100 percent of the chamber's internal surface area.

[0203] The heating element may extend around 95 percent or less of the internal surface area of ​​the chamber. The heating element may extend around 90 percent or less of the internal surface area of ​​the chamber. The heating element may extend around 80 percent or less of the internal surface area of ​​the chamber. The heating element may extend around 70 percent or less of the internal surface area of ​​the chamber.

[0204] The heating element may have one or more heating surfaces for heating the aerosol generating substrate to form an aerosol.

[0205] One or more heating surfaces may include a first heating surface for heating a first aerosol generating substrate located within a first portion of the chamber to form an aerosol.

[0206] One or more heating surfaces may include a second heating surface for heating a second aerosol generating substrate located within a second portion of the chamber to form an aerosol.

[0207] One or more of the heating surfaces may be flat heating surfaces.

[0208] One or more heating surfaces may include one or more planar heating surfaces for heating the aerosol generating substrate to form an aerosol.

[0209] One or more heating surfaces may include a first planar heating surface for heating a first aerosol generating substrate located within a first portion of the chamber to form an aerosol.

[0210] One or more heating surfaces may include a second planar heating surface for heating a second aerosol generating substrate located within a second portion of the chamber to form an aerosol.

[0211] At least one of the heating surfaces may have a surface area of ​​at least 25 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 30 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 35 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 40 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 45 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 50 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 55 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 60 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 65 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 70 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 75 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 80 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 85 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 90 square millimeters.

[0212] At least one of the heating surfaces may have a surface area of ​​200 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​190 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​180 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​170 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​160 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​150 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​140 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​130 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​120 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​115 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​110 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​105 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​100 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​95 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​90 square millimeters or less.

[0213] At least one of the one or more heated surfaces may have a surface area of ​​20 square millimeters to 200 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​20 square millimeters to 190 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​25 square millimeters to 180 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​30 square millimeters to 170 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​35 square millimeters to 160 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​40 square millimeters to 150 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​45 square millimeters to 140 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​50 square millimeters to 130 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​55 square millimeters to 120 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​60 square millimeters to 115 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​65 square millimeters to 110 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​70 square millimeters to 105 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​75 square millimeters to 100 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​80 square millimeters to 95 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​85 square millimeters to 90 square millimeters.

[0214] The ratio of the surface area of ​​one or more heated surfaces to the cross-sectional area of ​​the chamber in the plane on which the heating element extends may be at least 0.3. The ratio of the surface area of ​​one or more heated surfaces to the cross-sectional area of ​​the chamber in the plane on which the heating element extends may be at least 0.35. The ratio of the surface area of ​​one or more heated surfaces to the cross-sectional area of ​​the chamber in the plane on which the heating element extends may be at least 0.4.

[0215] The ratio of the surface area of ​​one or more heated surfaces to the cross-sectional area of ​​the chamber in the plane on which the heating element extends may be 0.6 or less. The ratio of the surface area of ​​one or more heated surfaces to the cross-sectional area of ​​the chamber in the plane on which the heating element extends may be 0.55 or less. The ratio of the surface area of ​​one or more heated surfaces to the cross-sectional area of ​​the chamber in the plane on which the heating element extends may be 0.5 or less.

[0216] The ratio of the surface area of ​​one or more heated surfaces to the cross-sectional area of ​​the chamber in the plane on which the heating element extends may be 0.3 to 0.6. The ratio of the surface area of ​​one or more heated surfaces to the cross-sectional area of ​​the chamber in the plane on which the heating element extends may be 0.35 to 0.55. The ratio of the surface area of ​​one or more heated surfaces to the cross-sectional area of ​​the chamber in the plane on which the heating element extends may be 0.4 to 0.5.

[0217] The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 25 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 30 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 35 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 40 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 45 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 50 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 55 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 60 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 65 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 70 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 72 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 75 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 80 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 85 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 90 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 95 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be at least 100 square millimeters.

[0218] The cross-sectional area of ​​the heating element in the plane on which it extends may be 200 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 190 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 180 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 170 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 160 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 150 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 140 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 130 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 120 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 110 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 100 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 95 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 90 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 85 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 80 square millimeters or less. The cross-sectional area of ​​the heating element in the plane on which it extends may be 75 square millimeters or less.

[0219] The cross-sectional area of ​​the heating element in the plane on which it extends may be 20 square millimeters to 200 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be 25 square millimeters to 180 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be 30 square millimeters to 160 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be 35 square millimeters to 140 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be 40 square millimeters to 120 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be 45 square millimeters to 100 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be 50 square millimeters to 95 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be 60 square millimeters to 90 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be 65 square millimeters to 85 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be 70 square millimeters to 80 square millimeters. The cross-sectional area of ​​the heating element in the plane on which it extends may be 70 square millimeters to 75 square millimeters.

[0220] The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 100 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 110 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 120 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 130 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 140 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 150 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 160 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 170 square millimeters.

[0221] The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 300 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 290 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 280 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 270 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 260 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 250 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 240 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 230 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 220 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 210 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 200 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 190 square millimeters or less. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 180 square millimeters or less.

[0222] The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 150 square millimeters to 250 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 150 square millimeters to 240 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 150 square millimeters to 230 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 160 square millimeters to 220 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 170 square millimeters to 210 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 180 square millimeters to 200 square millimeters. The cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 160 square millimeters to 200 square millimeters.

[0223] The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.1. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.12. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.14. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.16. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.18. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.2. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.22. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.24. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.26. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.28. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.3. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.32. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.34.The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.35.

[0224] The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.4. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.45. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.5. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.55. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.6. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.65. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.7. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be at least 0.75.

[0225] The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.9 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.85 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.80 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.75 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.7 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.65 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.6 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.55 or less.

[0226] The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.5 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.48 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.46 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.44 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.42 or less. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.4 or less.

[0227] The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be between 0.3 and 0.8.

[0228] The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.1 to 0.9. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.15 to 0.8. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.2 to 0.7. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.25 to 0.6. The ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends may be 0.3 to 0.5.

[0229] The heating element may be fixedly attached to the downstream portion.

[0230] The heating element may extend from the downstream portion into the chamber toward the upstream portion. The heating element may also extend from the downstream portion into the main body toward the upstream portion.

[0231] The heating element may have one or more electrical connection points. One or more electrical connection points may be conductive. One or more electrical connection points may be spaced apart from each other. One or more electrical connection points may comprise a first electrical connection point and a second electrical connection point. The first and second electrical connection points may be positioned opposite each other to the outlet. The first and second electrical connection points may be configured to make contact with an external power source.

[0232] One or more electrical connections may be located upstream.

[0233] The heating element may include an intermediate section extending between the downstream end section and the upstream end section. The downstream end section may be located at the downstream end of the cartridge. The upstream end section may be located at the upstream end of the cartridge.

[0234] The intermediate section may have a meandering shape. The intermediate section may have a coiled shape. The intermediate section may have a spiral shape. The intermediate section may have a flower-like shape.

[0235] The intermediate section may comprise multiple segments. The intermediate section may comprise at least eight segments. The intermediate section may comprise sixteen or fewer segments. The multiple segments may be parallel to each other. The multiple segments may extend along the longitudinal axis of the cartridge.

[0236] Each of the multiple segments may have a width of at least 0.26 millimeters. Each of the multiple segments may have a width of at least 0.27 millimeters. Each of the multiple segments may have a width of at least 0.28 millimeters. Each of the multiple segments may have a width of at least 0.29 millimeters. Each of the multiple segments may have a width of at least 0.3 millimeters.

[0237] Each of the multiple segments may have a width of 0.34 millimeters or less. Each of the multiple segments may have a width of 0.33 millimeters or less. Each of the multiple segments may have a width of 0.32 millimeters or less. Each of the multiple segments may have a width of 0.31 millimeters or less. Each of the multiple segments may have a width of 0.3 millimeters or less.

[0238] Each of the multiple segments may have a width of 0.26 mm to less than 0.34 mm. Each of the multiple segments may have a width of 0.27 mm to less than 0.33 mm. Each of the multiple segments may have a width of 0.28 mm to less than 0.32 mm. Each of the multiple segments may have a width of 0.29 mm to less than 0.31 mm.

[0239] Multiple segments may be separated from each other by gaps.

[0240] The gap may have a width of at least 0.28 millimeters. The gap may have a width of at least 0.29 millimeters. The gap may have a width of at least 0.3 millimeters. The gap may have a width of at least 0.31 millimeters. The gap may have a width of at least 0.32 millimeters.

[0241] The gap may have a width of 0.36 mm or less. The gap may have a width of 0.35 mm or less. The gap may have a width of 0.34 mm or less. The gap may have a width of 0.33 mm or less. The gap may have a width of 0.32 mm or less.

[0242] The gap may have a width of 0.28 mm to 0.36 mm. The gap may have a width of 0.29 mm to 0.35 mm. The gap may have a width of 0.3 mm to 0.34 mm. The gap may have a width of 0.31 mm to 0.33 mm.

[0243] The heating element may be formed from an iron-based alloy. The heating element may be formed from a nickel alloy. The heating element may be formed from ceramic. The heating element may be formed from stainless steel. The heating element may be formed from SS316L stainless steel iron aluminide. The heating element may be formed from nichrome. The heating element may be formed from ceramic-coated metal.

[0244] The heating element may have a length of at least 13 millimeters. The heating element may have a length of at least 13.5 millimeters. The heating element may have a length of at least 14 millimeters. The heating element may have a length of at least 14.5 millimeters. The heating element may have a length of at least 15 millimeters. The heating element may have a length of at least 15.5 millimeters. The heating element may have a length of at least 16 millimeters.

[0245] The heating element may have a length of 20 millimeters or less. The heating element may have a length of 19.5 millimeters or less. The heating element may have a length of 19 millimeters or less. The heating element may have a length of 18.5 millimeters or less. The heating element may have a length of 18 millimeters or less. The heating element may have a length of 17.5 millimeters or less. The heating element may have a length of 17 millimeters or less.

[0246] The heating element may have a length of 13 mm to 20 mm. The heating element may have a length of 13.5 mm to 19.5 mm. The heating element may have a length of 14 mm to 19 mm. The heating element may have a length of 14.5 mm to 18.5 mm. The heating element may have a length of 15 mm to 18 mm. The heating element may have a length of 15.5 mm to 17.5 mm. The heating element may have a length of 16 mm to 17 mm.

[0247] The heating element may have a width of at least 8 millimeters. The heating element may have a width of at least 8.5 millimeters. The heating element may have a width of at least 9 millimeters. The heating element may have a width of at least 9.5 millimeters.

[0248] The heating element may have a width of 12 millimeters or less. The heating element may have a width of 11.5 millimeters or less. The heating element may have a width of 11 millimeters or less. The heating element may have a width of 10.5 millimeters or less.

[0249] The heating element may have a width of 8 mm to 12 mm. The heating element may have a width of 8.5 mm to 11.5 mm. The heating element may have a width of 9 mm to 11 mm. The heating element may have a width of 9.5 mm to 10.5 mm.

[0250] The heating element may have a thickness of at least 0.1 millimeters. The heating element may have a thickness of at least 0.15 millimeters.

[0251] The heating element may have a thickness of 0.3 mm or less. The heating element may have a thickness of 0.25 mm or less. The heating element may have a thickness of 0.2 mm or less.

[0252] The heating element may have a thickness of 0.1 mm to 0.3 mm.

[0253] At least one of the heating surfaces may have a surface area of ​​at least 70 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 75 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 80 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 85 square millimeters. At least one of the heating surfaces may have a surface area of ​​at least 90 square millimeters.

[0254] At least one of the heating surfaces may have a surface area of ​​110 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​105 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​100 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​95 square millimeters or less. At least one of the heating surfaces may have a surface area of ​​90 square millimeters or less.

[0255] At least one of the one or more heated surfaces may have a surface area of ​​70 square millimeters to 110 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​75 square millimeters to 105 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​80 square millimeters to 100 square millimeters. At least one of the one or more heated surfaces may have a surface area of ​​85 square millimeters to 95 square millimeters.

[0256] The surface area of ​​the first heated surface may be substantially the same as the surface area of ​​the second heated surface.

[0257] The inlet may extend along the width of the housing. The outlet may extend along the width of the housing. The heating element may be aligned with at least one of the inlet and outlet.

[0258] The aerosol generating substrate may comprise one or more aerosol generating substrates. The aerosol generating substrate may comprise multiple aerosol generating substrates. The aerosol generating substrate may comprise a first aerosol generating substrate. The aerosol generating substrate may comprise a second aerosol generating substrate. The aerosol generating substrate may comprise a first aerosol generating substrate and a second aerosol generating substrate.

[0259] One or more aerosol generating substrates may comprise one or more solid aerosol generating substrates.

[0260] The first aerosol generating substrate may be placed within the first part of the chamber. The second aerosol generating substrate may be placed within the second part of the chamber.

[0261] The heating element may be arranged so as to substantially separate the first aerosol generating substrate and the second aerosol generating substrate from each other.

[0262] The first aerosol generating substrate may be substantially identical to the second aerosol generating substrate with respect to one or more of the following: shape, size, thickness, width, length, mass, orientation, material composition, and volume.

[0263] The first aerosol-generating substrate may be substantially the same as the second aerosol-generating substrate with respect to one or more volumes.

[0264] Advantageously, the heating efficiency can be improved by having the first aerosol generating substrate and the second aerosol generating substrate have the same or similar volumes.

[0265] Suitable types of materials for use in aerosol generating substrates are described below and include, for example, homogenized tobacco materials such as tobacco cut fillers and cast leaves, aerosol generating films, gel compositions, and powders.

[0266] As used herein, the term "solid" refers to an aerosol-generating substrate that is not a liquid or a gas and does not flow so as to maintain its shape and form at room temperature. In the context of the present invention, the term "solid" encompasses gel materials and compositions.

[0267] Preferably, the density of the aerosol-generating substrate in the chamber of the cartridge is at least 0.1 milligram per cubic millimeter of the chamber. The density of the shredded aerosol-generating substrate in the chamber of the cartridge is preferably at least 0.2 milligram per cubic millimeter of the chamber, more preferably at least 0.3 milligram per cubic millimeter of the chamber, more preferably at least 0.4 milligram per cubic millimeter of the chamber, and even more preferably at least 0.5 milligram per cubic millimeter of the chamber.

[0268] The density of the solid aerosol-generating substrate in the chamber of the cartridge is preferably less than 2 milligrams per cubic millimeter of the chamber, more preferably less than 1.75 milligrams per cubic millimeter of the chamber, more preferably less than 1.5 milligrams per cubic millimeter of the chamber, more preferably less than 1.25 milligrams per cubic millimeter of the chamber, and even more preferably less than 1 milligram per cubic millimeter of the chamber.

[0269] As used herein, the term "density" refers to the bulk density of the solid aerosol-generating substrate in the chamber. The density is calculated by dividing the total mass of the solid aerosol-generating substrate by the total volume of the chamber. Thus, the density corresponds to the weight of the solid aerosol-generating substrate per unit volume of the chamber. This is different from the density of the solid aerosol-generating substrate itself.

[0270] At least a portion of the aerosol generation substrate within the chamber will be in direct contact with one or more planar heater surfaces. The aerosol generation substrate is preferably configured to be in direct contact with one or more planar heating surfaces over a total surface area corresponding to at least 35 percent of the total cross-sectional area of the chamber in the plane in which the planar heating element extends. This means that the ratio of the total surface area of the aerosol generation substrate in direct contact with the planar heating surface to the total cross-sectional area of the chamber in the plane of the planar heater is at least 0.35.

[0271] The aerosol generation substrate is preferably configured to be in direct contact with one or more planar heating surfaces over a total surface area corresponding to at least 40 percent, preferably at least 45 percent of the total cross-sectional area of the chamber in the plane in which the planar heating element extends.

[0272] For the purposes of the present invention, the aerosol generation substrate (or a portion thereof) is in "direct contact" with the planar heating surface if, when the substrate is in contact with a portion of the planar heating surface that is heated during use and there is no space or intervening material therebetween. As a result of this direct contact, heat can be directly transferred from the planar heating surface to the contacting portion of the aerosol generation substrate.

[0273] The aerosol generation substrate is preferably in direct contact with the planar heating surface over a total area of at least 40 square millimeters, more preferably at least 45 square millimeters, more preferably at least 50 square millimeters, more preferably at least 55 square millimeters, more preferably at least 60 square millimeters. The aerosol generation substrate may be in direct contact with the planar heating surface over a total area of up to 120 square millimeters, or up to 110 square millimeters, or up to 100 square millimeters.

[0274] For example, the aerosol generating substrate may be in direct contact with a planar heated surface over a total area of ​​40 to 120 square millimeters, 45 to 120 square millimeters, 50 to 110 square millimeters, 55 to 110 square millimeters, or 60 to 100 square millimeters.

[0275] The filling rate of the chamber with the aerosol generating substrate is preferably at least 50 percent, more preferably at least 60 percent, and more preferably at least 70 percent. The filling rate is preferably less than 90 percent. The filling rate corresponds to the proportion of the cartridge chamber occupied by the aerosol generating substrate.

[0276] The aerosol generating substrate preferably includes an aerosol forming body. For example, suitable aerosol forming bodies include polyhydric alcohols such as triethylene glycol, 1,3-butanediol, propylene glycol, and glycerin; esters of polyhydric alcohols such as glycerol mono-, di-, or triacetate; aliphatic esters of mono-, di-, or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate; and combinations thereof.

[0277] The aerosol-forming body preferably contains one or more of glycerin and propylene glycol. The aerosol-forming body may consist of glycerin, propylene glycol, or a combination of glycerin and propylene glycol.

[0278] In certain embodiments, the aerosol generating substrate preferably contains at least 5 weight percent of aerosol-forming material on a dry weight basis of the aerosol generating substrate, more preferably at least 10 weight percent on a dry weight basis, and even more preferably at least 15 weight percent on a dry weight basis. In such embodiments, the aerosol generating substrate preferably contains 30 weight percent or less of aerosol-forming material on a dry weight basis of the aerosol generating substrate, more preferably 25 weight percent or less on a dry weight basis, and more preferably 20 weight percent or less on a dry weight basis. For example, the aerosol-forming material content of the aerosol generating substrate may be 5 weight percent to 30 weight percent, or 10 weight percent to 25 weight percent, or about 15 weight percent to about 20 weight percent on a dry weight basis. Therefore, in such embodiments, the aerosol-forming material content is relatively low.

[0279] In other embodiments, the aerosol generating substrate preferably contains at least 40 weight percent of aerosol forming material on a dry weight basis of the aerosol generating substrate, more preferably at least 45 weight percent on a dry weight basis, and more preferably at least 50 weight percent on a dry weight basis. In such embodiments, the aerosol generating substrate preferably contains 80 weight percent or less of aerosol forming material on a dry weight basis of the aerosol generating substrate, more preferably 75 weight percent or less on a dry weight basis, and more preferably 70 weight percent or less on a dry weight basis. For example, the aerosol forming material content of the aerosol generating substrate may be 40 weight percent to 80 weight percent, or 45 weight percent to 75 weight percent, or 50 weight percent to 70 weight percent on a dry weight basis. Therefore, in such embodiments, the aerosol forming material content is relatively high.

[0280] The aerosol-generating substrate preferably contains at least one of tobacco and nicotine. The aerosol-generating substrate may also contain tobacco that essentially contains nicotine. Alternatively, or additionally, the aerosol-generating substrate may contain exogenous nicotine, which is nicotine added as a specific component isolated from any tobacco plant material. In some embodiments, the aerosol-generating substrate may be substantially free of tobacco or tobacco-free.

[0281] When used herein in connection with the present invention, the term "nicotine" is used to refer to nicotine, a nicotine base, or a nicotine salt. In embodiments in which the aerosol generating substrate comprises a nicotine base or a nicotine salt, the amounts of nicotine listed herein are, respectively, amounts of free base nicotine or amounts of protonated nicotine.

[0282] The aerosol generating substrate preferably contains at least 0.5 weight percent of nicotine on a dry weight basis. More preferably, the aerosol generating substrate contains at least 1 weight percent of nicotine on a dry weight basis. Even more preferably, the aerosol generating substrate contains at least 2 weight percent of nicotine on a dry weight basis. In addition, or alternatively, the aerosol generating substrate preferably contains less than 10 weight percent of nicotine on a dry weight basis. More preferably, the aerosol generating substrate contains less than 8 weight percent of nicotine on a dry weight basis. More preferably, the aerosol generating substrate contains less than 6 weight percent of nicotine on a dry weight basis.

[0283] For example, the aerosol generating substrate may contain 0.5% to 10% by weight of nicotine, or 1% to 8% by weight of nicotine, or 2% to 6% by weight of nicotine, on a dry weight basis.

[0284] In certain embodiments, the aerosol generating substrate may be in the form of one or more sheets of solid aerosol generating substrate. Preferably, as defined above, one or more sheets of solid aerosol generating substrate comprise at least one aerosol forming body and at least one of nicotine and tobacco.

[0285] As used herein, the term “sheet” refers to a thin, layered element having a width and length substantially greater than its thickness.

[0286] In such embodiments, the density of the solid aerosol generating substrate in the chamber of the cartridge is preferably at least 0.3 milligrams per cubic millimeter of the chamber, more preferably at least 0.35 milligrams per cubic millimeter of the chamber, more preferably at least 0.4 milligrams per cubic millimeter of the chamber, more preferably at least 0.45 milligrams per cubic millimeter of the chamber, and more preferably at least 0.5 milligrams per cubic millimeter of the chamber.

[0287] For example, the density of the solid aerosol generating substrate in the cartridge chamber may correspond to 0.3 milligrams to 2 milligrams per cubic millimeter of chamber, or 0.35 milligrams to 1.75 milligrams per cubic millimeter of chamber, or 0.4 milligrams to 1.5 milligrams per cubic millimeter of chamber, or 0.45 milligrams to 1.25 milligrams per cubic millimeter of chamber, or 0.5 milligrams to 1 milligrams per cubic millimeter of chamber.

[0288] The thickness of one or more sheets of the solid aerosol generating substrate may be adapted according to the desired configuration of the sheets. In certain embodiments, each of the one or more sheets of the solid aerosol generating substrate may have an average thickness of less than 500 microns, or less than 400 microns, or less than 300 microns. Preferably, in such embodiments, each of the one or more sheets of the solid aerosol generating substrate may have a thickness of at least 100 microns, or at least 150 microns, or at least 200 microns. For example, each of the one or more sheets of the aerosol generating substrate may have an average thickness of 100 to 500 microns, or 150 to 400 microns, or 200 to 300 microns.

[0289] In such embodiments, it is preferable that one or more sheets are folded, assembled, crimped, or pleated.

[0290] In alternative embodiments, one or more sheets may have an average thickness of at least 1 millimeter, or at least 1.2 millimeters, or at least 1.5 millimeters. In such embodiments, if one or more sheets have a relatively high thickness, it may be possible to use a single sheet of solid aerosol generating substrate on at least one side, preferably both sides, of a planar heating element.

[0291] One or more sheets of the solid aerosol generating substrate may be provided on a suitable carrier element. For example, one or more sheets of the solid aerosol generating substrate can be deposited on at least one surface of a sheet of an inert carrier material such as paper or cardboard. This may provide improved rigidity to the one or more sheets of the solid aerosol generating substrate, which may facilitate the process of filling cartridges with one or more sheets during manufacturing.

[0292] One or more sheets of the solid aerosol generating substrate may be in the form of an assembly of one or more sheets. As used herein, the term "gathered" indicates that the sheet is entrained, folded, or compressed, or shrunk substantially laterally with respect to a defined axis.

[0293] Alternatively, or additionally, one or more sheets of the solid aerosol generating substrate may be in the form of one or more crimped sheets, preferably an assembly of one or more crimped sheets. As used herein, the term "crimped" means a sheet having a plurality of substantially parallel ridges or waveforms.

[0294] In embodiments comprising one or more sheets of the aerosol generating substrate, the chamber of the cartridge preferably contains at least 250 milligrams of the solid aerosol generating substrate, more preferably at least 300 milligrams of the solid aerosol generating substrate, more preferably at least 350 milligrams of the solid aerosol generating substrate. The chamber of the cartridge may contain up to 1000 milligrams of the solid aerosol generating substrate, or up to 750 milligrams of the solid aerosol generating substrate, or up to 500 milligrams of the solid aerosol generating substrate. For example, the chamber of the cartridge may contain 250 milligrams to 1000 milligrams of the solid aerosol generating substrate, or 300 milligrams to 750 milligrams of the solid aerosol generating substrate, or 350 milligrams to 500 milligrams of the solid aerosol generating substrate.

[0295] One or more sheets of the solid aerosol generating substrate may comprise one or more sheets of homogenized plant material, preferably homogenized tobacco material. The aerosol former content of the homogenized tobacco material is preferably within the range defined above for aerosol generating substrates having a relatively low aerosol former content.

[0296] Alternatively, or additionally, one or more sheets of the solid aerosol generating substrate may include one or more sheets comprising an aerosol generating film comprising a cellulose-based film-forming agent, nicotine, and an aerosol-forming agent. The aerosol generating film may further contain a cellulose-based reinforcing agent. The aerosol generating film may further contain water, preferably less than 30% by weight.

[0297] As used herein, the term “film” is used to describe a solid layered element having a thickness less than its width or length. The film may be self-supporting.

[0298] The aerosol-forming material content of the aerosol-generating film is within the range defined above for aerosol-generating substrates having a relatively high aerosol-forming material content.

[0299] In the context of the present invention, the term "cellulose-based film-forming agent" is used to refer to a cellulose polymer having the ability to form a continuous film, either by itself or in the presence of an auxiliary thickener. Preferably, the cellulose-based film-forming agent is selected from the group consisting of hydroxypropyl methylcellulose (HPMC), methylcellulose (MC), ethylcellulose (EC), hydroxyethyl methylcellulose (HEMC), hydroxyethylcellulose (HEC), hydroxypropylcellulose (HPC), and combinations thereof. In a particularly preferred embodiment, the cellulose-based film-forming agent is HPMC.

[0300] Suitable aerosol-generating films for use as an aerosol-generating substrate for an aerosol-generating article according to the present invention are described in WO-A-2020 / 207733 and WO-A-2022 / 074157.

[0301] Alternatively, or additionally, one or more sheets of the solid aerosol generating substrate may include one or more sheets containing a gel composition comprising nicotine, at least one gelling agent, and an aerosol forming body. The gel composition preferably does not contain tobacco.

[0302] A suitable gel composition for use as an aerosol generating substrate for an aerosol generating article according to the present invention is described in WO-A-2021 / 170642.

[0303] The gel composition preferably contains at least 50 weight percent, more preferably at least 60 weight percent, and more preferably at least 70 weight percent, of aerosol-forming material on a dry weight basis. The gel composition may contain up to 80 weight percent of aerosol-forming material. The aerosol-forming material in the gel composition is preferably glycerin.

[0304] In other embodiments, the aerosol generating substrate may be in the form of a shredded aerosol generating substrate. Preferably, the shredded aerosol generating substrate comprises at least one aerosol forming body and at least one of nicotine and tobacco.

[0305] As used herein, the term “shredded” describes an aerosol-generating substrate that is in the form of multiple shreds or fragments. Generally, shredded aerosol-generating substrates are formed by cutting or shredding larger portions of an aerosol-generating substrate, such as sheets, leaves, or pieces of other plant material. Individual fragments or strands are typically elongated, with length greater than width and thickness.

[0306] In such embodiments, the density of the shredded aerosol-generating substrate in the chamber of the cartridge is preferably less than 1 milligram per cubic millimeter of chamber, more preferably less than 0.9 milligrams per cubic millimeter of chamber, more preferably less than 0.8 milligrams per cubic millimeter of chamber, and more preferably less than 0.7 milligrams per cubic millimeter of chamber.

[0307] For example, the density of the shredded aerosol-generating substrate in the cartridge chamber may correspond to 0.1 milligrams to 1 milligram per cubic millimeter of chamber, or 0.2 milligrams to 0.9 milligrams per cubic millimeter of chamber, or 0.3 milligrams to 0.8 milligrams per cubic millimeter of chamber, or 0.4 milligrams to 0.7 milligrams per cubic millimeter of chamber, or 0.5 milligrams to 0.7 milligrams per cubic millimeter of chamber.

[0308] The cartridge chamber preferably contains at least 100 milligrams of shredded aerosol generating substrate, more preferably at least 125 milligrams of shredded aerosol generating substrate, and more preferably at least 150 milligrams of shredded aerosol generating substrate. The cartridge chamber may contain up to 300 milligrams of shredded aerosol generating substrate, or up to 275 milligrams of shredded aerosol generating substrate, or up to 250 milligrams of shredded aerosol generating substrate. For example, the cartridge chamber may contain 100 to 300 milligrams of shredded aerosol generating substrate, or 125 to 275 milligrams of shredded aerosol generating substrate, or 150 to 250 milligrams of shredded aerosol generating substrate.

[0309] Preferably, the shredded aerosol-generating substrate has a cut width of at least 0.3 mm, more preferably at least 0.4 mm, more preferably at least 0.5 mm, and more preferably at least 0.6 mm. Preferably, the shredded aerosol-generating substrate has a cut width of less than 2 mm, more preferably less than 1.75 mm, more preferably less than 1.5 mm, more preferably less than 1.25 mm, and more preferably less than 1 mm.

[0310] For example, the cut width of the shredded aerosol-generating substrate may be 0.3 mm to 2 mm, or 0.4 mm to 1.75 mm, or 0.5 mm to 1.5 mm, or 0.6 mm to 1 mm.

[0311] The shredded aerosol-generating substrate may be in the form of shredded tobacco material, such as cut filler. Alternatively, the shredded aerosol-generating substrate may be in the form of shredded sheets of homogenized plant material, such as homogenized tobacco material. Alternatively, the shredded aerosol-generating substrate may be in the form of shredded non-tobacco material, as will be described in more detail below.

[0312] In certain preferred embodiments of the present invention, the shredded aerosol-generating substrate is a cut filler. In the context of this specification, the term “cut filler” is used to refer to a blend of shredded plant materials, such as tobacco plant material, which specifically includes one or more of leaf laminas, processed stems and veins, and homogenized plant materials.

[0313] The cut filler is preferably immersed in an aerosol-forming material. The cut filler preferably contains 5% to 20% by weight, more preferably 10% to 18% by weight, and more preferably 12% to 15% by weight, of the aerosol-forming material, on a dry weight basis.

[0314] In certain embodiments, the shredded aerosol-generating substrate includes shredded homogenized plant material, preferably shredded homogenized tobacco material. Suitable homogenized plant materials for use in the present invention are as described above.

[0315] In other embodiments, the shredded aerosol-generating substrate includes an aerosol-generating film. Suitable aerosol-generating films are described above.

[0316] In alternative embodiments of the present invention, the shredded aerosol-generating substrate may include a gel composition. Suitable gel compositions are as described above.

[0317] In alternative embodiments, the solid aerosol generating substrate may contain a plurality of particles, as well as at least one of tobacco and nicotine.

[0318] In such embodiments, the density of the solid aerosol generating substrate in the chamber of the cartridge is preferably at least 0.3 milligrams per cubic millimeter of the chamber, more preferably at least 0.35 milligrams per cubic millimeter of the chamber, more preferably at least 0.4 milligrams per cubic millimeter of the chamber, more preferably at least 0.45 milligrams per cubic millimeter of the chamber, and more preferably at least 0.5 milligrams per cubic millimeter of the chamber.

[0319] For example, the density of the solid aerosol generating substrate in the cartridge chamber may correspond to 0.3 milligrams to 2 milligrams per cubic millimeter of chamber, or 0.35 milligrams to 1.75 milligrams per cubic millimeter of chamber, or 0.4 milligrams to 1.5 milligrams per cubic millimeter of chamber, or 0.45 milligrams to 1.25 milligrams per cubic millimeter of chamber, or 0.5 milligrams to 1 milligrams per cubic millimeter of chamber.

[0320] The particles of the solid aerosol generating substrate are preferably supplied directly into the cartridge chamber. However, alternatively, the particles of the solid aerosol generating substrate may be supplied in one or more permeable containers, such as one or more permeable pouches. One or more permeable pouches may then be inserted into the cartridge chamber before use.

[0321] The pouch may have any suitable dimensions that allow it to be positioned within the chamber of the cartridge. Preferably, the first permeable pouch may be positioned within the first part of the chamber of the cartridge. Preferably, the second permeable pouch may be positioned within the second part of the chamber of the cartridge. For example, the permeable pouch may have an external volume of at least 180 cubic millimeters, for example, at least 200 cubic millimeters, for example, at least 220 cubic millimeters, for example, at least 240 cubic millimeters, for example, at least 260 cubic millimeters. The permeable pouch may have an external volume of 350 cubic millimeters or less, for example, less than 330 cubic millimeters, for example, less than 310 cubic millimeters, for example, less than 290 cubic millimeters.

[0322] Multiple particles of the solid aerosol generating substrate may be provided in the form of loose particles. Alternatively, multiple particles of the solid aerosol generating substrate may be compressed into one or more tablets. One or more tablets may then be supplied into the chamber of a cartridge. One or more tablets may contain multiple tobacco particles, such as ground tobacco. One or more tablets may contain multiple particles containing nicotine. One or more tablets may be inserted into the chamber of the cartridge before use.

[0323] The tablets may have any suitable dimensions that allow them to be positioned within the chamber of the cartridge. Preferably, the first tablet may be positioned within the first part of the chamber of the cartridge. Preferably, the second tablet may be positioned within the second part of the chamber of the cartridge. For example, the tablets may have an external volume of at least 180 cubic millimeters, for example, at least 200 cubic millimeters, for example, at least 220 cubic millimeters, for example, at least 240 cubic millimeters, for example, at least 260 cubic millimeters. The tablets may have an external volume of 350 cubic millimeters or less, for example, less than 330 cubic millimeters, for example less than 310 cubic millimeters, for example less than 290 cubic millimeters.

[0324] As defined above, the solid aerosol generating substrate comprises a plurality of particles, as well as at least one of tobacco and nicotine.

[0325] In certain embodiments, the maximum size of each particle is preferably at least 0.05 mm, more preferably at least 0.1 mm, more preferably at least 0.15 mm, more preferably at least 0.2 mm, more preferably at least 0.25 mm, more preferably at least 0.5 mm, more preferably at least 0.75 mm, and more preferably at least 1 mm. The maximum size of each particle is preferably 10 mm or less, more preferably 9 mm or less, more preferably 8 mm or less, more preferably 6 mm or less, and more preferably 5 mm or less. Supplying relatively large particles within these ranges may be preferable because the cartridge housing is equipped with an air intake and outlet, as will be discussed later. Next, the relatively large maximum size of the particles ensures that the particles are not lost through the inlet and outlet holes.

[0326] The maximum dimension of a particle corresponds to its maximum outer diameter. If the particle is substantially spherical, the maximum dimension of the particle corresponds to its diameter.

[0327] In such embodiments, the plurality of particles preferably comprises at least two particles of the solid aerosol generating substrate, more preferably at least five particles of the solid aerosol generating substrate, more preferably at least ten particles of the solid aerosol generating substrate, more preferably at least 20 particles of the solid aerosol generating substrate, and more preferably at least 30 particles. The plurality of particles may comprise up to 200 particles.

[0328] In other embodiments, the solid aerosol generating substrate may be in the form of a powder having more smaller particles. For example, in such embodiments, the powder may be formed from particles having a D50 particle size of 50 to 80 micrometers, 50 to 75 micrometers, 55 to 75 micrometers, 55 to 70 micrometers, or 60 to 70 micrometers.

[0329] As used herein in connection with the present invention, the term "D50 particle size" refers to the median particle size of a particulate material or powder. The D50 particle size is the particle size that divides the distribution in half, with half of the particles being larger than the D50 particle size and the other half being smaller than the D50 particle size. The particle size distribution can be determined by laser diffraction. For example, the particle size distribution can be determined by laser diffraction using a Malvern Mastersizer 3000 laser diffraction particle size analyzer, according to the manufacturer's instructions.

[0330] The powder may be formed from particles having a D95 particle size of 80 to 130 micrometers, 90 to 125 micrometers, 100 to 120 micrometers, or 110 to 120 micrometers.

[0331] As used herein in connection with the present invention, the term "D95 particle size" means a particle size in which 95 percent of the mass proportion of particles having a particle size less than this value is 95 percent.

[0332] The powder may be formed from particles having a maximum diameter of 50 to 250 micrometers, 80 to 225 micrometers, or 100 to 125 micrometers.

[0333] In some embodiments, the mass of each particle may be preferably at least 0.05 micrograms, more preferably at least 0.1 micrograms, more preferably at least 0.2 micrograms, more preferably at least 0.3 micrograms, more preferably at least 0.4 micrograms, more preferably at least 0.5 micrograms, more preferably at least 0.6 micrograms, more preferably at least 0.7 micrograms, more preferably at least 0.8 micrograms, more preferably at least 0.9 micrograms, more preferably at least 1 microgram, more preferably at least 10 micrograms, more preferably at least 100 micrograms, more preferably at least 200 micrograms, more preferably at least 500 micrograms, or more preferably at least 1 milligram. The mass of each particle may also be preferably 600 milligrams or less, more preferably 500 milligrams or less, more preferably 400 milligrams or less, more preferably 300 milligrams or less, more preferably 200 milligrams or less, more preferably 100 milligrams or less, more preferably 50 milligrams or less, or more preferably 10 milligrams or less.

[0334] As defined above, the solid aerosol generating substrate comprises a plurality of particles, as well as at least one of tobacco and nicotine. The plurality of particles may have a variety of different forms and compositions. For example, the plurality of particles may include nicotine-containing powder, ground tobacco particles, or a plurality of beads, pellets, or granules of the solid aerosol generating substrate.

[0335] As described above, the solid aerosol generating substrate may include an aerosol forming body.

[0336] The solid aerosol generating substrate may also be in powder form.

[0337] The solid aerosol generating substrate may be a powder containing nicotine. As described above, the powder may contain at least one aerosol forming element.

[0338] In some embodiments, the particles may be particles of ground tobacco.

[0339] In alternative embodiments, the solid aerosol generating substrate may comprise a plurality of particles comprising a gel composition containing nicotine, at least one gelling agent, and an aerosol-forming body. Suitable gel compositions are as described above.

[0340] The particles in the gel composition may be gel beads. The gel beads may be formed by molding or any suitable means known to those skilled in the art.

[0341] In alternative embodiments of the present invention, the solid aerosol generating substrate may include core-shell particles. The core-shell particles may comprise an inner core and an outer shell, the inner core containing a liquid solvent comprising tobacco particles and one or more aerosol-forming bodies, the outer shell enclosing the inner core, and the outer shell comprising at least one film-forming polymer. In such embodiments, the solid aerosol generating substrate may contain, on a dry weight basis, at least 20 weight percent of tobacco particles and at least 30 weight percent of one or more aerosol-forming bodies. Suitable aerosol-forming bodies are described above.

[0342] The downstream portion may comprise a transparent material. The downstream portion may be formed from a transparent material. The downstream portion may comprise a translucent material. The downstream portion may be formed from a translucent material. The downstream portion may comprise a plastic. The downstream portion may include a high-temperature plastic. The downstream portion may be formed from a liquid crystal polymer, a polyetheretherketone, or a cyclic olefin copolymer. The downstream portion may be injection molded.

[0343] The upstream portion may comprise a transparent material. The upstream portion may be formed from a transparent material. The upstream portion may comprise a translucent material. The upstream portion may be formed from a translucent material. The upstream portion may comprise a plastic. The upstream portion may include a high-temperature plastic. The upstream portion may be formed from a liquid crystal polymer, a polyether ether ketone, or a cyclic olefin copolymer. The upstream portion may be injection molded.

[0344] The body may be formed from plant material. The body may be formed from metal. The body may be formed from aluminum. The body may be formed from alloy. The body may be formed from stainless steel. The body may be formed from plastic. The body may include high-temperature plastic. The body may be formed from liquid crystal polymer, polyetheretherketone, or cyclic olefin copolymer. The body may be injection molded.

[0345] An aerosol generating system is also provided. The aerosol generating system may comprise an aerosol generating device. The aerosol generating system may comprise a cartridge. The cartridge may comprise a housing having an inlet and an outlet. The cartridge may comprise a chamber between the inlet and the outlet. The cartridge may comprise a heating element for forming an aerosol by heating an aerosol forming substrate. The heating element may extend into the chamber. The chamber may comprise a first portion on a first side of the heating element and a second portion on a second side of the heating element. The cartridge may comprise an aerosol generating substrate disposed within at least one of the first portion and the second portion. The first portion and the second portion may have a total internal volume of at least 500 cubic millimeters.

[0346] Aerosol generating system is also provided, comprising an aerosol generator and a cartridge, wherein the cartridge comprises a housing having an inlet and an outlet, and a chamber between the inlet and the outlet; a heating element for heating an aerosol forming substrate to form an aerosol, wherein the heating element extends into the chamber, and the chamber comprises a first part on a first side of the heating element and a second part on a second side of the heating element; and an aerosol forming substrate disposed within at least one of the first part and the second part, wherein the first part and the second part have a total internal volume of at least 500 cubic millimeters.

[0347] The aerosol generator may include a main unit.

[0348] The aerosol generator may be equipped with a device cavity for receiving a cartridge.

[0349] The aerosol generator may be equipped with a lid.

[0350] The aerosol generator may be equipped with a power source. The power source may be a battery.

[0351] The aerosol generator may be configured to include a controller. [Examples]

[0352] A non-exclusive list of non-limiting embodiments is provided below. One or more features of these embodiments may be combined with any one or more features of other embodiments, forms, or aspects described herein.

[0353] Example 1. A cartridge for an aerosol generator, comprising a housing having an inlet and an outlet, and an aerosol generating substrate. Example 2. A cartridge according to Example 1, comprising a chamber between the inlet and outlet. Example 3. The cartridge according to Example 2, comprising a heating element for heating an aerosol-forming substrate to form an aerosol. Example 4. The cartridge according to Example 3, wherein the heating element extends into the chamber. Example 5. The cartridge according to Example 3 or 4, wherein the chamber comprises a first portion on the first side surface of the heating element and a second portion on the second side surface of the heating element. Example 6. The cartridge according to Example 5, wherein the aerosol generating substrate is disposed within at least one of the first and second parts. Example 7. The housing is a cartridge according to any one of Examples 1 to 6, comprising a main body extending between an upstream portion and a downstream portion. Example 8. The cartridge according to Example 7, wherein the upstream portion has an inlet. Example 9. The cartridge according to embodiment 7 or 8, wherein the downstream portion is provided with an outlet. Example 10. A cartridge according to any one of Examples 7 to 9, wherein the body has an internal area of ​​at least 40 square millimeters in an axial cross-section. Example 11. A cartridge according to any one of Examples 7 to 10, wherein the main body has an internal area of ​​80 square millimeters or less in an axial cross-section. Example 12. A cartridge according to any of Examples 7 to 11, wherein the body has an internal area of ​​40 square millimeters to 80 square millimeters in an axial cross-section. Example 13. The cartridge according to Example 12, wherein the body has an internal area of ​​50 square millimeters to 70 square millimeters in an axial cross-section. Example 14. A cartridge according to any of Examples 7 to 13, wherein the body has an outer circumference of at least 30 millimeters in an axial cross-section. Example 15. A cartridge according to any of Examples 7 to 14, wherein the body has an outer circumference of 40 mm or less in an axial cross-section. Example 16. A cartridge according to any of Examples 7 to 15, wherein the body has an outer circumference of 30 to 40 millimeters in an axial cross-section. Example 17. A cartridge according to any one of Examples 7 to 16, wherein the ratio of the outer circumference to the internal area is at least 0.38. Example 18. The cartridge according to Example 17, wherein the ratio of the outer circumference to the inner area is at least 0.45. Example 19. A cartridge according to any of Examples 7 to 18, wherein the ratio of the outer circumference to the internal area is 0.5 or less. Example 20. A cartridge according to any of Examples 7 to 19, wherein the ratio of the outer circumference to the inner area is 0.38 to 0.5. Example 21. The cartridge according to Example 4, wherein the cross-sectional area of ​​the heating element in the plane on which the heating element extends is at least 60 square millimeters. Example 22. The cartridge according to Example 4 or 21, wherein the cross-sectional area of ​​the heating element on the plane over which the heating element extends is 90 square millimeters or less. Example 23. The cartridge according to any one of Examples 4, 21, or 22, wherein the cross-sectional area of ​​the heating element in the plane on which the heating element extends is 60 square millimeters to 90 square millimeters. Example 24. The cartridge according to Example 23, wherein the cross-sectional area of ​​the heating element on the plane over which the heating element extends is 70 square millimeters to 80 square millimeters. Example 25. The cartridge according to Example 4 or any of Examples 21-24, wherein the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends is at least 150 square millimeters. Example 26. The cartridge according to Example 4 or any of Examples 21 to 25, wherein the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends is 250 square millimeters or less. Example 27. A cartridge according to Example 4 or any of Examples 21 to 26, wherein the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends is 150 square millimeters to 250 square millimeters. Example 28. A cartridge according to Example 4 or any of Examples 21 to 27, wherein the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends is 160 square millimeters to 200 square millimeters. Example 29. The cartridge according to Example 4 or any of Examples 21 to 28, wherein the ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends is at least 0.3. Example 30. The cartridge according to Example 4 or any of Examples 21 to 29, wherein the ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends is 0.8 or less. Example 31. A cartridge according to Example 4 or any of Examples 21 to 30, wherein the ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends is 0.3 to 0.8. Example 32. The cartridge according to Example 31, wherein the ratio of the cross-sectional area of ​​the heating element in the plane on which the heating element extends to the cross-sectional area of ​​the chamber in the plane on which the planar heating element extends is 0.3 to 0.5. Example 33. The cartridge according to either Example 4 or any one of Examples 21 to 32, wherein the heating element is a flat heating element. Example 34. The cartridge according to Example 33, wherein a planar heating element includes one or more planar heating surfaces for heating an aerosol generating substrate to form an aerosol. Example 35. The cartridge according to Example 33 or Example 34, wherein a planar heating element includes two planar heating surfaces for heating an aerosol generating substrate to form an aerosol. Example 36. The cartridge according to Example 34 or Example 35, wherein each of the one or more planar heating surfaces has a surface area of ​​at least 55 square millimeters. Example 37. A cartridge according to any one of Examples 34 to 36, wherein each of the one or more planar heating surfaces has a surface area of ​​120 square millimeters or less. Example 38. A cartridge according to any one of Examples 34 to 37, wherein each of the one or more planar heating surfaces has a surface area of ​​55 square millimeters to 120 square millimeters. Example 39. A cartridge according to any one of Examples 34 to 38, wherein the ratio of the surface area of ​​one or more planar heating surfaces to the cross-sectional area of ​​the planar chamber on which the planar heating element extends is at least 0.3. Example 40. A cartridge according to any one of Examples 34 to 39, wherein the ratio of the surface area of ​​one or more planar heating surfaces to the cross-sectional area of ​​the planar chamber on which the planar heating element extends is 0.6 or less. Example 41. A cartridge according to any one of Examples 34 to 40, wherein the ratio of the surface area of ​​one or more planar heating surfaces to the cross-sectional area of ​​the planar chamber on which the planar heating element extends is 0.3 to 0.6. Example 42. The cartridge according to Example 5, wherein the first and second parts have a total internal volume of at least 400 cubic millimeters. Example 43. The cartridge according to Example 5 or Example 42, wherein the first and second parts have a total internal volume of at least 500 cubic millimeters. Example 44. A cartridge according to any one of Examples 5, 42, or 43, wherein the first and second parts have a total internal volume of 800 cubic millimeters or less. Example 45. A cartridge according to Example 5, or any of Examples 42 to 44, wherein the first and second parts have a total internal volume of 700 cubic millimeters or less. Example 46. A cartridge according to either Example 5 or Examples 42-45, wherein the first and second parts have a total internal volume of 500 cubic millimeters to 700 cubic millimeters. Example 47. The cartridge according to Example 5 or any of Examples 42 to 46, wherein the aerosol generating substrate comprises a first aerosol generating substrate disposed within a first portion and a second aerosol generating substrate disposed within a second portion. Example 48. A cartridge according to any of Examples 1 to 47, wherein the housing has an external volume of at least 1300 cubic millimeters. Example 49. A cartridge according to any of Examples 1 to 48, wherein the housing has an external volume of 1500 cubic millimeters or less. Example 50. A cartridge according to any of Examples 1 to 49, wherein the housing has an external volume of 1300 cubic millimeters to 1500 cubic millimeters. Example 51. The cartridge according to Example 5, wherein the internal volume of the first part is substantially the same as the internal volume of the second part. Example 52. The cartridge according to Example 5 or Example 51, wherein the first part is substantially the same as the second part of the chamber with respect to at least one of the shape, size, thickness, width, length, and orientation. Example 53. A cartridge according to any of Examples 1 to 52, wherein the housing is a rigid housing. Example 54. The cartridge according to Example 7, wherein the main body has an external length of 16 to 18 millimeters. Example 55. The cartridge according to Example 7 or Example 54, wherein the main body has an external width of 11.5 mm to 13 mm. Example 56. A cartridge according to any one of Examples 7, 54, or 55, wherein the main body has an external depth of 5 mm to 6.5 mm. Example 57. A cartridge according to any of Examples 1 to 56, wherein the inlet has multiple inlet openings. Example 58. A cartridge according to any of Examples 1 to 57, wherein the outlet has multiple outlet openings. Example 59. A cartridge according to any of Examples 1 to 58, comprising an airflow path extending between an inlet and an outlet. Example 60. The cartridge according to Example 3 or Example 4, wherein the heating element comprises an intermediate section extending between the downstream end section and the upstream end section. Example 61. The cartridge according to Example 60, wherein the intermediate section has a meandering shape, a winding shape, a spiral shape, or a floral shape. Example 62. The cartridge according to Example 60 or Example 61, wherein the intermediate section includes multiple segments. Example 63. A cartridge according to Example 62, wherein multiple segments are parallel to each other. Example 64. The cartridge according to Example 63, wherein multiple segments extend along the longitudinal axis of the cartridge. Example 65. A cartridge according to any one of Examples 1 to 64, wherein the cartridge comprises one or more solid aerosol generating substrates. Example 66. The cartridge according to Example 65, wherein one or more solid aerosol generating substrates are provided in a chamber defined between an inlet and an outlet, and the density of the aerosol generating substrates in the chamber is at least 0.1 milligrams per cubic millimeter of the chamber. Example 67. The cartridge according to Example 66, wherein the density of the aerosol generating substrate in the chamber is at least 0.3 milligrams per cubic millimeter of the chamber. Example 68. The cartridge according to Example 66 or 67, wherein the density of the aerosol generating substrate in the chamber is less than 2 milligrams per cubic millimeter of the chamber. Example 69. The cartridge according to Example 66 or 67, wherein the density of the aerosol generating substrate in the chamber is less than 1 milligram per cubic millimeter of the chamber. Example 70. The cartridge according to any one of Examples 1 to 69, wherein the cartridge comprises a planar heating element having one or more planar heating surfaces, and the aerosol generating substrate is configured to be in direct contact with one or more planar heating surfaces over a total surface area corresponding to at least 35 percent of the total cross-sectional area of ​​the chamber in the plane on which the planar heating element extends. Example 71. The cartridge according to the embodiment, wherein the aerosol generating substrate is in direct contact with a planar heating surface over a total area of ​​at least 40 square millimeters. Example 72. A cartridge according to any of Examples 71, wherein the aerosol generating substrate is in direct contact with a planar heating surface over a total area of ​​up to 120 square millimeters. Example 73. A cartridge according to any one of Examples 1 to 72, wherein an aerosol generating substrate is provided in a chamber defined between an inlet and an outlet, and the chamber is filled to at least 50 percent by the aerosol generating substrate. Example 74. A cartridge according to any one of Examples 1 to 73, wherein the aerosol generating substrate includes an aerosol forming body. Example 75. The cartridge according to Example 74, wherein the aerosol generating substrate contains at least 5% by weight of an aerosol forming material on a dry weight basis. Example 76. The cartridge according to Example 75, wherein the aerosol generating substrate contains up to 30 weight percent of aerosol-forming material on a dry weight basis. Example 77. The cartridge according to Example 74, wherein the aerosol generating substrate contains at least 40 weight percent of an aerosol forming material on a dry weight basis. Example 78. The cartridge according to Example 77, wherein the aerosol generating substrate contains up to 80 weight percent of aerosol-forming material on a dry weight basis. Example 79. A cartridge according to any one of Examples 1 to 78, wherein the aerosol generating substrate contains exogenous nicotine. Example 80. A cartridge according to any one of Examples 1 to 79, wherein the aerosol generating substrate contains tobacco. Example 81. A cartridge according to any one of Examples 1 to 79, wherein the aerosol generating substrate is substantially free of tobacco. Example 82. A cartridge according to any one of Examples 1 to 81, wherein the aerosol generating substrate contains at least 0.5 weight percent nicotine on a dry weight basis. Example 83. A cartridge according to any of Examples 1 to 82, wherein the aerosol generating substrate contains up to 10 weight percent nicotine on a dry weight basis. Example 84. A cartridge according to any one of Examples 1 to 83, wherein the aerosol generating substrate is in the form of one or more sheets of solid aerosol generating substrate. Example 85. The cartridge according to Example 84, wherein an aerosol generating substrate is provided in a chamber defined between an inlet and an outlet, and the density of the aerosol generating substrate is 0.3 milligrams to 2 milligrams per cubic millimeter of the chamber. Example 86. The cartridge according to Example 84 or 85, wherein each of the one or more sheets has an average thickness of less than 500 microns. Example 87. The cartridge according to Example 84 or 85, wherein each of the one or more sheets has an average thickness of at least 1 millimeter. Example 88. A cartridge according to any of Examples 84 to 87, wherein one or more sheets of aerosol generating substrate are collected. Example 89. A cartridge according to any one of Examples 84 to 88, wherein one or more sheets of aerosol generating substrate are crimped. Example 90. A cartridge according to any one of Examples 84 to 89, wherein an aerosol generating substrate is provided in a chamber defined between an inlet and an outlet, and the chamber of the cartridge contains one or more sheets of at least 250 milligrams of solid aerosol generating substrate. Example 91. A cartridge according to any one of Examples 84 to 90, wherein one or more sheets of aerosol generating substrate include one or more sheets of homogenized plant material. Example 92. A cartridge according to any one of Examples 84 to 91, wherein one or more sheets of aerosol generating substrate include one or more sheets of homogenized tobacco material. Example 93. A cartridge according to any one of Examples 84 to 92, wherein one or more sheets of aerosol generating substrate include one or more sheets of aerosol generating film containing a cellulose-based film-forming agent, nicotine, and an aerosol-forming agent. Example 94. A cartridge according to any one of Examples 84 to 93, wherein one or more sheets of aerosol generating substrate include one or more sheets containing a gel composition comprising nicotine, at least one gelling agent, and an aerosol forming body. Example 95. A cartridge according to any one of Examples 1 to 83, wherein the aerosol generating substrate is provided in a chamber defined between an inlet and an outlet, and the aerosol generating substrate is in the form of a shredded aerosol generating substrate. Example 96. The cartridge according to Example 95, wherein the density of the shredded aerosol-generating substrate is 0.1 milligrams to 1 milligram per cubic millimeter of the chamber. Example 97. A cartridge according to any one of Examples 95 to 96, wherein the cartridge chamber contains at least 100 milligrams of shredded aerosol generating substrate. Example 98. A cartridge according to any one of Examples 95 to 97, wherein the shredded aerosol generating substrate has a cut width of at least 0.3 millimeters. Example 99. A cartridge according to any one of Examples 95 to 98, wherein the shredded aerosol generating substrate has a cut width of less than 2 millimeters. Example 100. A cartridge according to any one of Examples 95 to 99, wherein the shredded aerosol generating substrate contains a cut filler. Example 101. A cartridge according to any one of Examples 95 to 100, wherein the shredded aerosol generating substrate contains homogenized plant material. Example 102. A cartridge according to any one of Examples 95 to 101, wherein the shredded aerosol generating substrate comprises an aerosol generating film containing a cellulose-based film-forming agent, nicotine, and an aerosol-forming agent. Example 103. A cartridge according to any one of Examples 95 to 102, wherein the shredded aerosol generating substrate comprises a gel composition containing nicotine, at least one gelling agent, and an aerosol forming body. Example 104. A cartridge according to any one of Examples 1 to 83, wherein the aerosol generating substrate contains multiple particles. Example 105. The cartridge according to Example 104, wherein the aerosol generating substrate contains at least one of tobacco or nicotine. Example 106. The cartridge according to Example 104, wherein an aerosol generating substrate is provided in a chamber defined between an inlet and an outlet, and the density of the aerosol generating substrate is 0.3 milligrams to 2 milligrams per cubic millimeter of the chamber. Example 107. A cartridge according to any of Examples 104 to 106, wherein multiple particles are provided in a permeable pouch. Example 108. The cartridge according to Example 107, wherein the pouch has an external volume of at least 180 cubic millimeters. Example 109. A cartridge according to any one of Examples 104 to 106, wherein multiple particles are compressed into one or more tablets. Example 110. A cartridge according to any one of Examples 104 to 106, wherein multiple particles are in the form of loose particles. Example 111. A cartridge according to any one of Examples 104 to 110, wherein the aerosol generating substrate is in the form of a powder. Example 112. The cartridge according to Example 111, wherein the powder has a D50 size of 50 micrometers to 80 micrometers. Example 113. The cartridge according to Example 111 or 112, wherein the powder has a D95 size of 80 micrometers to 130 micrometers. Example 114. A cartridge according to any one of Examples 104 to 113, wherein the aerosol generating substrate is in the form of crushed tobacco. Example 115. The cartridge according to any one of Examples 104 to 113, wherein the aerosol generating substrate comprises a plurality of particles comprising a gel composition containing nicotine, at least one gelling agent, and an aerosol forming body.

[0354] As used herein, the terms “proximal” and “distal” are used to describe the relative positions of components or parts of components of an aerosol generating cartridge according to the present invention. The system and cartridge have a proximal end through which the aerosol exits the cartridge or system during use. The cartridge has a distal end opposite to the proximal end. The proximal end of the cartridge may also be referred to as the oral end or downstream end. The distal end of the cartridge may also be referred to as the upstream end.

Claims

1. A cartridge for an aerosol generator, wherein the cartridge is A housing comprising a main body extending between an upstream portion and a downstream portion, wherein the upstream portion has an inlet, the downstream portion has an outlet, and the main body defines a chamber between the upstream portion and the downstream portion, A heating element for heating the aerosol-forming substrate to form an aerosol, comprising a heating element extending into the chamber, A chamber including a first portion on the first side surface of the heating element and a second portion on the second side surface of the heating element, Aerosol generating substrate disposed in at least one of the first part and the second part, The dimensions of the main body in the axial cross-section are: Internal area of ​​40 square millimeters to 80 square millimeters, Having a circumference of at least 30 millimeters, A cartridge in which the ratio of the outer circumference to the inner area is at least 0.

38.

2. The cartridge according to claim 1, wherein the internal area is 50 square millimeters to 70 square millimeters.

3. The cartridge according to claim 1 or 2, wherein the outer circumference is 40 millimeters or less.

4. The cartridge according to any one of claims 1 to 3, wherein the outer circumference is 30 millimeters to 35 millimeters.

5. The cartridge according to any one of claims 1 to 4, wherein the ratio of the outer circumference to the inner area is 0.38 to 0.

5.

6. The cartridge according to any one of claims 1 to 5, wherein the ratio of the outer circumference to the inner area is at least 0.

45.

7. The cartridge according to any one of claims 1 to 6, wherein the heating element is a planar heating element.

8. The cartridge according to any one of claims 1 to 7, wherein the aerosol generating substrate comprises a first aerosol generating substrate disposed within the first portion and a second aerosol generating substrate disposed within the second portion.

9. The cartridge according to any one of claims 1 to 8, wherein the first portion and the second portion have a total internal volume of at least 500 cubic millimeters.

10. The cartridge according to any one of claims 1 to 9, wherein the first part and the second part have a total internal volume of 700 cubic millimeters or less.

11. The cartridge according to any one of claims 1 to 10, wherein the aerosol generating substrate is a solid aerosol generating substrate.

12. The cartridge according to any one of claims 1 to 11, wherein the housing is a rigid housing.

13. The cartridge according to any one of claims 1 to 12, wherein the first portion of the chamber has substantially the same internal volume as the internal volume of the second portion.

14. The cartridge according to any one of claims 1 to 13, wherein the inlet comprises a plurality of inlet openings.

15. The cartridge according to any one of claims 1 to 14, wherein the housing has an external volume of 1,300 cubic millimeters to 1,500 cubic millimeters.

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