Aerosol generating substrate, aerosol generating product, and electronic atomizing device

Abstract

The present application relates to the technical field of aerosol generation, and provides an aerosol generating substrate, an aerosol generating product, and an electronic atomizing device. The aerosol generating substrate comprises a base part and a plurality of subunits, wherein the plurality of subunits are located on the outer side of the base part in a first direction, the plurality of subunits are spaced in a second direction of the base part, and the space between every two adjacent subunits is a gap space, wherein the first direction intersects with the second direction. The outer surface of each subunit receives heat and then transfers the heat to the base part, where the heat is transferred from outside to inside; the aerosol generating substrate is provided with the gap spaces, and the gap spaces play a role in collecting and circulating aerosol; a subunit can release vapor in an inward direction and an outward direction, and further, the subunit can release aerosol to the gap spaces on two sides in the second direction, thereby obtaining a clear aerosol release path, avoiding the situation that the aerosol cannot be released in time, and thus improving the aerosol extraction efficiency.

Description

Aerosol-generating substrate, aerosol-generating product, and electronic atomization device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202310818339.1 and application date of July 4, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of aerosol generation technology, and in particular to an aerosol generating substrate, an aerosol generating product and an electronic atomization device. Background Art

[0004] The aerosol-generating substrate can form an aerosol by ignition or by heating without combustion. For example, the aerosol-generating substrate that is heated without combustion is heated using an external heat source to a sufficient temperature to emit an aerosol. The aerosol-generating substrate does not burn, and the aerosol is released by heating the aerosol-generating substrate during use.

[0005] In related technologies, the density of the physical medium of the aerosol-generating matrix is ​​relatively high, which results in the aerosol being unable to be released in a timely manner, and the aerosol extraction efficiency is greatly reduced.

[0006] Summary of the Invention

[0007] In view of this, the embodiments of the present application hope to provide an aerosol generating substrate, an aerosol generating product and an electronic atomization device that can improve the aerosol extraction efficiency.

[0008] To achieve the above objectives, the present invention provides an aerosol-generating substrate, comprising:

[0009] Basic Department;

[0010] A plurality of subunits are located outside the base portion along a first direction, and the plurality of subunits are spaced apart along a second direction of the base portion, with a gap space between two adjacent subunits, wherein the first direction and the second direction intersect.

[0011] In some embodiments, the subunit includes a first portion and a second portion, the second portion and the first portion are arranged along a first direction, and a size of the first portion along the second direction is larger than a size of the second portion along the second direction;

[0012] The second portion connects the base portion and the first portion, or the first portion connects the base portion and the second portion.

[0013] In some embodiments, the subunit includes one first part and multiple second parts, the multiple second parts are spaced apart along the second direction and located inside the first part, and the second part connects the base part and the first part.

[0014] In some embodiments, a distance between two adjacent first portions along the second direction is a first distance, and a ratio of a size of the first portion along the second direction to the first distance is between 10:1 and 1:1.

[0015] In some embodiments, the wall thickness of the first portion is 0.1 mm to 0.5 mm.

[0016] In some embodiments, a dimension of the second portion along the first direction is 0.5 mm to 5 mm.

[0017] In some embodiments, a ratio of a size of the first portion along the second direction to a size of the second portion along the first direction is 1:2 to 2:1.

[0018] In some embodiments, the difference between the maximum wall thickness and the minimum wall thickness of the aerosol-generating substrate is a first difference, and the first difference is a percentage of the minimum wall thickness of the aerosol-generating substrate ranging from 0% to 100%.

[0019] In some embodiments, with the plane perpendicular to the third direction as the projection surface, the hydraulic diameter of the projected shape of the aerosol generating substrate is 5 mm to 15 mm.

[0020] In some embodiments, the number of the subunits is between 6 and 30.

[0021] In some embodiments, the minimum distance between two adjacent subunits along the second direction is 0.1 mm to 1 mm.

[0022] In some embodiments, taking a plane perpendicular to the third direction as a projection plane, the ratio of the total projection area of ​​all the sub-units to the total projection area of ​​all the gap spaces is between 1:9 and 1:1.

[0023] In some embodiments, the base portion is a plate-shaped structure, and the wall thickness direction of the base portion is consistent with the first direction; or,

[0024] The base portion is in a cylindrical structure.

[0025] In some embodiments, an air passage is formed inside the base portion and passes through at least one end thereof along the third direction.

[0026] In some embodiments, there are multiple airways, and the multiple airways are arranged at intervals.

[0027] In some embodiments, the outer side of the aerosol generating substrate is configured with a heat-generating layer, which is disposed on the outer surface of the subunit and is capable of heating the subunit; and / or,

[0028] Taking the plane perpendicular to the third direction as the projection plane, the projection shape of the aerosol generating substrate is circular, elliptical or polygonal.

[0029] In some embodiments, the subunit is located at the outermost side of the aerosol generating substrate along the first direction; and / or,

[0030] Taking a plane perpendicular to the third direction as a cross section, the cross section at any position of the subunit is the same, wherein the first direction and the third direction are perpendicular to each other.

[0031] In some embodiments, the first direction and the second direction are perpendicular to each other; or

[0032] The first direction is the radial direction, and the second direction is the circumferential direction.

[0033] The present application provides an aerosol-generating article, comprising:

[0034] The aerosol-generating substrate described in any one of the above items;

[0035] The functional segment is arranged at one end of the aerosol generating substrate along the third direction, and the functional segment at least includes a filtering segment for filtering aerosol.

[0036] The present application also provides an electronic atomization device, comprising:

[0037] The aerosol-generating article described above;

[0038] A heating element is provided on the outer side of the subunit along the first direction, and is used for heating the aerosol generating substrate to generate aerosol.

[0039] In some embodiments, the heating element is laser heating.

[0040] In the embodiment of the present application, the outer surface of the subunit first receives heat and then transfers it to the base. The heat is transferred from the outside to the inside. The aerosol generating matrix has a gap space, and the gap space plays the role of collecting and circulating the aerosol. The smoke release direction of the subunit not only includes outward and inward, but also can release aerosol to the gap space on both sides of the second direction, which unblocks the aerosol release path and avoids the situation where the aerosol cannot be released in time. Therefore, the aerosol extraction efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a schematic structural diagram of a first aerosol generating substrate in one embodiment of the present application;

[0042] FIG2 is a schematic structural diagram of the first aerosol generating substrate shown in FIG1 from another perspective;

[0043] FIG3 is a schematic structural diagram of a second aerosol generating substrate in one embodiment of the present application;

[0044] FIG4 is a schematic structural diagram of the second aerosol generating substrate shown in FIG3 from another perspective;

[0045] FIG5 is a schematic structural diagram of a third aerosol generating substrate in one embodiment of the present application;

[0046] FIG6 is a schematic structural diagram of the third aerosol generating substrate shown in FIG5 from another perspective;

[0047] FIG7 is a schematic structural diagram of a first seed unit in one embodiment of the present application;

[0048] FIG8 is a schematic structural diagram of a second seed unit in one embodiment of the present application;

[0049] FIG9 is a schematic structural diagram of a third seed unit in an embodiment of the present application;

[0050] FIG10 is a schematic structural diagram of a fourth seed unit in an embodiment of the present application;

[0051] FIG11 is a schematic structural diagram of a fifth seed unit in an embodiment of the present application;

[0052] FIG12 is a schematic structural diagram of a sixth seed unit in an embodiment of the present application. DETAILED DESCRIPTION

[0053] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0054] In this application, a plurality includes two and more than two. The unit "mm" is millimeter.

[0055] In the related art, since the density of the physical medium of the aerosol generating matrix in the related art is relatively high, it is difficult for the aerosol to circulate inside the aerosol generating matrix in a short period of time, or it is difficult to release the aerosol from the physical medium of the aerosol generating matrix to the outside world. Therefore, the aerosol cannot be released in time, and the aerosol extraction efficiency is greatly reduced.

[0056] The present application provides an aerosol-generating substrate, as shown in Figures 1 to 5 . The aerosol-generating substrate comprises a base 1 and multiple subunits 2. The subunits 2 are positioned outside the base 1 along a first direction. The subunits 2 are spaced apart along a second direction of the base 1. The space between two adjacent subunits 2 is defined as a gap space 2a. The first and second directions intersect. In other words, the outer surface of the aerosol-generating substrate is a discontinuous surface. The gap space 2a is used to collect and circulate aerosol.

[0057] It should be noted that in the embodiments of the present application, the aerosol-generating substrate is used to generate aerosols by heating. For example, the aerosol-generating substrate can be used to generate aerosols by heating without burning. That is, the aerosol-generating substrate is heated below its ignition point to generate aerosols. The aerosol-generating substrate does not burn during the aerosol generation process. In some application scenarios, the aerosol-generating substrate can be used to generate aerosols by ignition. The aerosol-generating substrate of the present application is more commonly used to generate aerosols by heating without burning.

[0058] The present application also provides an aerosol-generating article, comprising the aerosol-generating substrate of any of the embodiments of the present application and a functional segment. The functional segment is disposed at one end of the aerosol-generating substrate along a third direction, and the functional segment includes at least a filter segment for filtering aerosols. The filter segment is configured to filter aerosols generated by the aerosol-generating substrate.

[0059] Aerosol-generating articles are designed to allow users to inhale aerosols generated by an aerosol-generating substrate. For example, users can hold a filter segment in their mouth and inhale the filtered aerosol. The aerosol generated by the aerosol-generating substrate is transported to the filter segment under the influence of negative pressure.

[0060] The aerosol-generating article is used in conjunction with an electronic atomization device having a heating element.

[0061] The electronic atomization device provided in an embodiment of the present application includes the aerosol generating product and a heating element in any embodiment of the present application. The heating element is arranged on the outside of the subunit 2 along the first direction, and the heating element is used to heat the aerosol generating matrix to generate an aerosol.

[0062] The heating element is disposed on the outside of the subunit 2 to heat the aerosol-generating substrate from the outside in. For example, the heating element heats the subunit 2 from the outside, and heat can be transferred from the subunit 2 to the base 1. In other words, heat is transferred from the outside to the inside.

[0063] The heating methods of the heating element include, but are not limited to, resistance heating, electromagnetic heating, infrared heating, microwave heating or laser heating, etc. Among them, the heating element may be in contact with the outer surface of the subunit 2 or not. Transferring heat in the form of thermal convection means that the heating element is not in contact with the aerosol generating matrix, the heating element first heats the air, and then the hot air bakes and heats the aerosol generating matrix. Heat conduction means that the heating element is in contact with the aerosol generating matrix and conducts heat to the aerosol generating matrix. Exemplarily, resistance and electromagnetic heating mainly transfer heat to the aerosol generating matrix in the form of thermal conduction or thermal convection. Infrared heating, microwave heating or laser heating mainly transfer heat to the aerosol generating matrix in the form of thermal radiation. That is, the heating element can heat the aerosol generating matrix in one or more of the three forms of thermal conduction, thermal convection and thermal radiation.

[0064] In one embodiment, the heating element is a laser heater. A laser heater is a device that emits laser light to heat the aerosol-generating substrate. Lasers offer highly concentrated energy and high timeliness, enabling rapid aerosol generation. High timeliness refers to the fact that both the laser heating and heating cessation times are very short. In other words, the laser can heat the aerosol-generating substrate to generate aerosol in a short period of time, and can also stop heating the aerosol-generating substrate in a short period of time. Therefore, it is essential that the aerosol-generating substrate be able to release generated aerosol promptly to prevent aerosol accumulation.

[0065] Exemplarily, the heating element includes, but is not limited to, a laser diode, a semiconductor laser, a helium-neon laser, a single-mode laser, a multi-mode laser, and the like.

[0066] In the embodiment of the present application, the outer surface of the subunit 2 first receives heat and then transfers it to the base part 1. The heat is transferred from the outside to the inside. The aerosol generating matrix has a gap space 2a. The gap space 2a plays the role of collecting and circulating the aerosol. The smoke release direction of the subunit 2 not only includes outward and inward, but also can release aerosol to the gap space 2a on both sides of the second direction, which unblocks the release path of the aerosol and avoids the situation where the aerosol cannot be released in time. Therefore, the extraction efficiency of the aerosol can be improved.

[0067] In one embodiment, a heat-generating layer is disposed on the outer surface of the aerosol-generating matrix. The heat-generating layer is disposed on the outer surface of the subunit 2 and is capable of heating the subunit 2. This increases the amount of heat transferred to the subunit 2. The heat-generating layer can cover the gap between the outer surfaces of two adjacent subunits 2, thereby limiting the flow of aerosol and ambient air in the interstitial space 2a along the third direction, thereby increasing air intake and improving aerosol extraction efficiency. Because aerosol can be released in multiple directions, including outward, inward, and toward the interstitial spaces 2a on both sides of the second direction, the risk of bulging of the heat-generating layer and reduced heat transfer efficiency between the outer surface and the heat-generating layer is reduced.

[0068] The specific structure of the heating layer is not limited. For example, the heating layer is a light-absorbing layer. That is, the heating layer can absorb a light beam and generate heat. For example, the heating layer can absorb laser light and emit heat.

[0069] In one embodiment, referring to Figure 1 , subunit 2 is located at the outermost portion of the aerosol-generating substrate along a first direction. That is, the remaining portions of the aerosol-generating substrate are located inward of subunit 2 along the first direction, and the outer circumference of subunit 2 is the outer circumference of the aerosol-generating substrate. Subunit 2 is the portion of the aerosol-generating substrate closest to the heat-generating layer.

[0070] In one embodiment, referring to FIG. 2 and FIG. 7 , the subunit 2 includes a first portion 21 and a second portion 22 . The second portion 22 and the first portion 21 are arranged along a first direction. A dimension W2 of the first portion 21 along the second direction is greater than a dimension W3 of the second portion 22 along the second direction.

[0071] In one embodiment, referring to Figures 1 to 6 , the second portion 22 connects the base 1 and the first portion 21. Specifically, the first portion 21 is located outside the second portion 22. Thus, after being irradiated by laser light or receiving heat conducted by the light-absorbing layer, the first portion 21 releases aerosol in various directions, including outward, inward, and in the second direction. Furthermore, the second portion 22 and the base 1 are also heated by heat conduction (to a lesser extent than the first portion 21), and the aerosol generated by this heating is also released into the interstitial space 2a. Because the dimension W2 of the first portion 21 along the second direction is larger than the dimension W3 of the second portion 22 along the second direction, the outer surface area of ​​the first portion 21 is larger. Due to the high concentration of laser heat energy, the larger the area of ​​the medium in which the subunit 2 initially contacts the laser light, the better. This ensures that there is sufficient solid medium to absorb the energy generated by the laser light, allowing for the release of more aerosol.

[0072] It should be noted that the outer surface of the subunit 2, such as the outer surface of the first part 21, can be used to receive the heat generated by laser irradiation. The outer surface of the subunit 2 can be directly irradiated by the laser, or the laser can irradiate the light-absorbing layer, causing the light-absorbing layer to generate heat and heat the subunit 2.

[0073] In one embodiment, the first portion 21 connects the base 1 and the second portion 22. Specifically, the second portion 22 is located outside the first portion 21. This allows the second portion 22 to release aerosols in all directions after being irradiated by laser light or receiving heat from the light-absorbing layer. Furthermore, the first portion 21 and base 1 are heated by heat conduction, and the aerosols generated by the heating are also released into the interstitial space 2a. Because the dimension W3 of the second portion 22 along the second direction is smaller than the dimension W2 of the first portion 21 along the second direction, the outer surface area of ​​the second portion 22 is smaller, resulting in a relatively small amount of aerosol released.

[0074] In one embodiment, referring to FIG1 , the cross-section of the subunit 2 is identical at any position along a plane perpendicular to the third direction, where the first and third directions are perpendicular to each other. The identical cross-section includes identical cross-sectional shapes and identical cross-sectional areas. In other words, the cross-section of the subunit 2 remains consistent along the third direction. For example, the cross-section of the first portion 21 is identical at any position, and the cross-section of the second portion 22 is identical at any position along the plane perpendicular to the third direction.

[0075] In one embodiment, referring to Figures 1 and 2 , a gap space 2a extends through both ends of the subunit 2 along the third direction. Airflow can flow from one end of the subunit 2 to the other along the third direction. This allows the airflow, formed by the aerosol carried by the air, to flow more smoothly, with less flow resistance, significantly reducing the inhalation resistance during the puffing process and improving the puffing experience.

[0076] In one embodiment, the aerosol generating matrix is ​​an integral structure. For example, the aerosol generating matrix is ​​an integral structure formed by extrusion. Extrusion molding refers to a processing method in which the material passes through the interaction between the barrel and the extrusion screw of the extrusion device, the material is heated and plasticized and pushed toward the discharge port by the extrusion screw, and is formed into an aerosol generating matrix with a preset projected shape and corresponding pores through an extrusion mold, such as a mouth mold. Exemplarily, the base portion 1, the subunit 2 and the gap space 2a can be formed by extrusion molding. In this way, the aerosol generating matrix is ​​an integral medium during use, such as when it is heated and sucked or after it stops being heated, and is not prone to the problem of disintegration and falling.

[0077] It should be noted that the third direction refers to the direction in which the aerosol-generating substrate extends. For example, if the aerosol-generating substrate is extruded, the third direction is the direction of extrusion of the aerosol-generating substrate. The projected shape refers to the shape of the aerosol-generating substrate when projected onto a plane perpendicular to the third direction.

[0078] In one embodiment, referring to Figures 1 to 7 , the first portion 21 is a plate-like structure extending along the second direction, while the second portion 22 is a plate-like structure extending along the first direction. In other words, both the first portion 21 and the second portion 22 are solid dielectric. This design simplifies the structure of the first portion 21 and the second portion 22 and facilitates manufacturing.

[0079] In one embodiment, referring to FIG. 12 , the subunit 2 includes a first portion 21 and multiple second portions 22 . The multiple second portions 22 are spaced apart along the second direction and located inside the first portion 21 . The second portions 22 connect the base 1 and the first portion 21 . On the one hand, the multiple second portions 22 can increase the mass of the subunit 2's physical medium. The greater the mass of the medium, the greater the mass of the aerosol that can be produced, thereby increasing the total amount of aerosol that can be released. On the other hand, the multiple second portions 22 are spaced apart along the second direction, with gaps between adjacent second portions 22 to facilitate the circulation of aerosol and allow heat to penetrate the gaps and enter the interior. On the other hand, the multiple second portions 22 can also provide increased support for the first portion 21 , allowing the first portion 21 to better maintain its shape and reduce deformation. This ensures a balance between aerosol release and circulation.

[0080] For example, in one embodiment, please refer to Figure 12, the first part 21 and the second part 22 are both plate-like structures, and the subunit 2 includes a first part 21 and two second parts 22. The plane perpendicular to the third direction is used as the projection surface, and the projection of the first part 21 and the projection of the two second parts 22 together form a π shape.

[0081] In one embodiment, referring to Figures 1 to 11 , the subunit 2 includes a first portion 21 and a second portion 22. Both the first portion 21 and the second portion 22 are plate-like structures. With a plane perpendicular to the third direction as the projection plane, the projections of the first portion 21 and the second portion 22 together form a T-shape.

[0082] In one embodiment, referring to FIG. 7 , the first portion 21 and the second portion 22 are both structures of equal wall thickness, and the wall thickness H1 of the first portion 21 is equal to the wall thickness of the second portion 22 .

[0083] It should be noted that the uniform wall thickness structure refers to a structure in which the thickness of the dielectric wall is equal everywhere.

[0084] In one embodiment, referring to FIG. 8 , the first portion 21 has a uniform wall thickness, and the wall thickness of the second portion 22 gradually increases from being closer to the first portion 21 to being farther away from the first portion 21 .

[0085] In one embodiment, referring to FIG9 , the corners of the first portion 21 are rounded, and the connection between the first portion 21 and the second portion 22 is rounded. This can reduce stress concentration and damage caused by sharp corners at the corners and connections.

[0086] In one embodiment, as shown in Figure 10 , the connection between the first portion 21 and the second portion 22 is chamfered. In other words, the wall thickness of the connection between the first portion 21 and the second portion 22 gradually increases from closer to the second portion 22 to farther away from the second portion 22. With a plane perpendicular to the third direction as the projection plane, the projection of the first portion 21 and the projection of the second portion 22 together form a T-shape, and the connection between the first portion 21 and the second portion 22 is trapezoidal.

[0087] In one embodiment, referring to FIG. 11 , the wall thickness of both ends of the first portion 21 along the second direction is greater than the wall thickness of the remaining portion of the first portion 21 .

[0088] In one embodiment, referring to FIG2 , the distance between two adjacent first portions 21 along the second direction is a first distance L, and the ratio of the dimension W2 of the first portion 21 along the second direction to the first distance L is between 10:1 and 1:1. For example, the ratio of the dimension W2 of the first portion 21 along the second direction to the first distance L is 10:1, 9:1, 8:1, 7:1, 6:1, 5.5:1, 5.5:1, 5:1, 3:1, or 1:1, etc.

[0089] In this embodiment, if the ratio of the dimension W2 of the first portion 21 along the second direction to the first spacing L is greater than 10:1, the mass of the medium in the first portion 21 is high, while the first spacing L is relatively small. Consequently, more aerosol is generated, while the gap space 2a for aerosol circulation is relatively small, resulting in greater suction resistance. Furthermore, the smaller the first spacing L, the more complex the manufacturing process, such as the extrusion process, of the aerosol-generating substrate becomes, making it more difficult to extrude and mold the aerosol-generating substrate, and reducing the yield rate. If the ratio of the dimension W2 of the first portion 21 along the second direction to the first spacing L is less than 1:1, the mass of the medium in the first portion 21 is low, while the first spacing L is relatively large. Consequently, less aerosol is generated, while the gap space 2a for aerosol circulation is relatively large, making the generated aerosol difficult to meet suction requirements. Therefore, the ratio of the dimension W2 of the first portion 21 along the second direction to the first spacing L is between 10:1 and 1:1. While ensuring a high yield rate of manufacturing the aerosol generating matrix, it can maximize the effective extraction of the aerosol, balance the aerosol release amount and the suction resistance, and provide a good user experience.

[0090] In one embodiment, referring to FIG7 , the wall thickness H1 of the first part 21 is 0.1 mm to 0.5 mm. Exemplarily, the wall thickness H1 of the first part 21 is 0.1 mm, 0.2 mm, 0.3 mm, 0.35 mm, 0.4 mm or 0.5 mm, etc. If the wall thickness H1 of the first part 21 is less than 0.1 mm, the wall thickness H1 of the first part 21 is too small, the amount of aerosol released by the physical medium per unit area is too small, and the first part 21 is easily deformed. If the wall thickness H1 of the first part 21 is greater than 0.5 mm, the aerosol generated in the first direction of the first part 21 is difficult to be effectively released. In this way, the wall thickness H1 of the first part 21 is moderate, which not only has good structural strength and is easy to manufacture, such as extrusion molding, but also can produce a suitable amount of aerosol released and can be released quickly so that it can be inhaled by the user.

[0091] In one embodiment, referring to FIG7 , the dimension W1 of the second portion 22 along the first direction is 0.5 mm to 5 mm. The dimension W1 of the second portion 22 along the first direction is 0.5 mm, 0.6 mm, 0.9 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 4.8 mm, or 5 mm, among others. If the dimension W1 of the second portion 22 along the first direction is less than 0.5 mm, the distance between the second portion 22 and the base portion 1 is too close, and the dimension of the gap space 2a along the first direction is too narrow, resulting in insufficient space for aerosol circulation and difficulty in inhalation. If the dimension W1 of the second portion 22 along the first direction is greater than 5 mm, the second portion 22 is easily deformed during manufacturing, resulting in a low yield rate. The dimension W1 of the second portion 22 along the first direction is 0.5 mm to 5 mm. Thus, the dimension W1 of the second portion 22 along the first direction is moderate, providing both good structural strength, ease of manufacturing, such as extrusion molding, and convenient inhalation.

[0092] In one embodiment, referring to FIG. 7 , the ratio of the dimension W2 of the first portion 21 along the second direction to the dimension W1 of the second portion 22 along the first direction is 1:2 to 2:1. If the ratio of the dimension W2 of the first portion 21 along the second direction to the dimension W1 of the second portion 22 along the first direction is less than 1:2, insufficient aerosol release or deformation of the second portion 22 may occur. If the ratio of the dimension W2 of the first portion 21 along the second direction to the dimension W1 of the second portion 22 along the first direction is greater than 2:1, the volume of the gap space 2a is insufficient, the aerosol circulation space is too small, and inhalation is difficult. Therefore, the ratio of the dimension W2 of the first portion 21 along the second direction to the dimension W1 of the second portion 22 along the first direction is 1:2 to 2:1. In this way, the subunit 2 has good structural strength and is easy to manufacture, such as by extrusion molding, while ensuring that the gap space 2a is sufficient for inhalation.

[0093] In one embodiment, the difference between the maximum wall thickness and the minimum wall thickness of the aerosol-generating substrate is a first difference, and the first difference is a percentage of the minimum wall thickness of the aerosol-generating substrate ranging from 0% to 100%. In other words, the maximum wall thickness of the aerosol-generating substrate is no greater than twice the minimum wall thickness. If the maximum wall thickness of the aerosol-generating substrate is greater than twice the minimum wall thickness, that is, the first difference is a percentage of the minimum wall thickness of the aerosol-generating substrate greater than 100%, the wall thickness differences between different parts of the aerosol-generating substrate may be too large, which may easily make it difficult to form parts of the aerosol-generating substrate during the manufacturing process, such as extrusion, e.g., difficult to extrude.

[0094] In one embodiment, the first difference is a percentage of the minimum wall thickness of the aerosol-generating substrate of 0%, meaning that the wall thickness of all parts of the aerosol-generating substrate is uniform. For example, the wall thicknesses of the first portion 21, the second portion 22, and the base portion 1 are all uniform. This highly consistent wall thickness across all parts of the aerosol-generating substrate prevents difficulties in forming certain structures of the aerosol-generating substrate during manufacturing processes, such as extrusion, thereby improving product yield.

[0095] In one embodiment, referring to FIG2 , the hydraulic diameter D of the projected shape of the aerosol generating matrix is ​​5 mm to 15 mm, with the plane perpendicular to the third direction as the projection plane. Exemplarily, the hydraulic diameter D of the projected shape of the aerosol generating matrix is ​​5 mm, 6 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm or 15 mm, etc. On the one hand, it is convenient for the aerosol generating matrix to adapt to the handheld electronic atomization device; on the other hand, the time for the aerosol generating matrix to transfer heat from the outside to the inside is moderate, so that the aerosol is released evenly during the puffing process; on the other hand, the total amount of aerosol released by the aerosol generating matrix is ​​appropriate, and the total release time of the aerosol is moderate, that is, the service life of the aerosol generating matrix is ​​moderate, ensuring that the number of puffs is suitable for customer needs, avoiding insufficient or excessive puffing, and providing a good user puffing experience.

[0096] It should be understood that the projected shape of the aerosol-generating substrate refers to the outline of the projected surface of the aerosol-generating substrate. For example, the projected shape of the aerosol-generating substrate refers to the outer contour of the cross-section formed by the base portion 1, the first portion 21, the second portion 22, and the release gap. For example, if the first portion 21 is located outside the second portion 22, the projected shape of the aerosol-generating substrate refers to the outer contour formed by the outer side surfaces of the first portion 21 of all subunits 2.

[0097] In one embodiment, the first direction and the second direction are perpendicular to each other. For example, the first direction and the second direction are two linear directions. Referring to FIG. 6 , taking the projected shape of the aerosol-generating substrate as a rectangle as an example, the first direction may be the width direction, and the second direction may be the length direction.

[0098] In one embodiment, the first direction is radial and the second direction is circumferential. Referring to FIG1 , taking the projected shape of the aerosol generating substrate as a circle as an example, the first direction may be radial and the second direction may be circumferential.

[0099] For example, in one embodiment, the projection of the aerosol-generating substrate onto a plane perpendicular to the third direction is a circle (see Figures 2 and 4 ), an ellipse, or a polygon. Polygons include, but are not limited to, squares, rectangles (see Figure 6 ), pentagons, hexagons, or octagons. In other words, the aerosol-generating substrate can be cylindrical, cuboid, or prism-shaped, among others.

[0100] In the embodiments of this application, the hydraulic diameter refers to the ratio of four times the projected area of ​​the shape to the perimeter. For example, if the projected shape of the aerosol-generating substrate is a rectangle, the hydraulic diameter is the ratio of four times the area of ​​the rectangle to the perimeter of the rectangle. For another example, if the projected shape of the aerosol-generating substrate is a circle, the hydraulic diameter is the diameter of the circle.

[0101] In one embodiment, the number of subunits 2 is between 6 and 30 (inclusive). In this way, the sum of the medium masses of all subunits 2 and the sum of the volumes of all release gaps are adapted. In other words, the amount of aerosol released is adapted to the flow rate of aerosol in the release gaps, so that the aerosol-generating substrate releases aerosol uniformly during the heating process.

[0102] In one embodiment, the minimum spacing between two adjacent subunits 2 along the second direction is 0.1 mm to 1 mm. For example, the minimum spacing between two adjacent subunits 2 along the second direction is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 0.9 mm or 1 mm, etc.

[0103] For example, referring to FIG2 , the minimum spacing between two adjacent subunits 2 along the second direction is the first spacing L between two adjacent first portions 21 along the second direction. That is, the first spacing L between two adjacent first portions 21 along the second direction is 0.1 mm to 1 mm (inclusive).

[0104] In this embodiment, if the minimum spacing between two adjacent subunits 2 along the second direction is less than 0.1 mm, the distance between the two adjacent subunits 2 is too close, the gap space 2a is relatively small, and the suction resistance is large. In addition, the smaller the minimum spacing between two adjacent subunits 2 along the second direction, the more complicated the manufacturing process of the aerosol generating matrix, such as the extrusion process, the more difficult it is to extrude and form the aerosol generating matrix, and the lower the yield rate.

[0105] If the minimum distance between two adjacent subunits 2 along the second direction is greater than 1 mm, the medium mass of the subunit 2 is relatively small, so that less aerosol is generated and the gap space 2a for circulating aerosol is relatively large, and the generated aerosol is difficult to meet the inhalation demand.

[0106] Therefore, the minimum distance between two adjacent subunits 2 along the second direction is 0.1 mm to 1 mm, which can balance the aerosol release amount and the suction resistance while ensuring a high manufacturing yield of the aerosol generating substrate.

[0107] In one embodiment, with a plane perpendicular to the third direction as the projection plane, the ratio of the total projected area of ​​all subunits 2 to the total projected area of ​​all interstitial spaces 2a is 1:9 to 1:1 (inclusive). Preferably, the ratio of the total projected area of ​​all subunits 2 to the total projected area of ​​all interstitial spaces 2a is 1:4 to 1:2 (inclusive).

[0108] The total projected area of ​​all subunits 2 refers to the sum of the projected areas of all subunits 2. The total projected area of ​​all interstitial spaces 2a refers to the sum of the projected areas of all interstitial spaces 2a.

[0109] In this embodiment, if the ratio of the total projected area of ​​all subunits 2 to the total projected area of ​​all interstitial spaces 2a is greater than 1:1, the total medium mass of the subunits 2 is relatively high, while the projected area of ​​the release gaps is relatively small. This makes it easy for aerosol to be adsorbed by the solid medium and condense, resulting in insufficient aerosol release and low effective utilization of the solid medium. If the ratio of the total projected area of ​​all subunits 2 to the total projected area of ​​all interstitial spaces 2a is less than 1:9, the projected area of ​​the release gaps is relatively large, resulting in a slow aerosol flow rate and difficulty in effective extraction, which is detrimental to the puffing experience.

[0110] In one embodiment, referring to Figures 5 and 6 , the base portion 1 is a plate-like structure, with the wall thickness of the base portion 1 parallel to the first direction. The wall thickness of the base portion 1, the wall thickness H1 of the first portion 21, and the wall thickness of the second portion 22 can be substantially consistent to facilitate manufacturing, such as extrusion molding.

[0111] For example, in one embodiment, referring to Figures 5 and 6 , the base 1, first portion 21, and second portion 22 all have plate-like structures. The aerosol-generating substrate includes two side portions 3, with all subunits 2 positioned between the two side portions 3. All second portions 22 and the two side portions 3 are connected to the outer surface of the base 1. The projected shape of the aerosol-generating substrate is rectangular.

[0112] In one embodiment, referring to Figures 1 to 4 , the base portion 1 is a cylindrical structure. The cylindrical structure is not only convenient for arranging more subunits 2 on the periphery, but also convenient for molding, such as extrusion molding.

[0113] In one embodiment, referring to Figures 1 to 4 , the base portion 1 is internally formed with an airway 1a extending through at least one end thereof along a third direction. Airway 1a also collects and circulates aerosols. Aerosols released from the base portion 1 can be rapidly circulated through airway 1a, improving the effective extraction rate of the aerosols.

[0114] In one embodiment, as shown in Figures 1 to 4 , air passages 1a extend through opposite ends of the base portion 1 along the third direction. Airflow can flow from one end of the base portion 1 to the other end along the third direction. This allows the airflow, formed by the aerosol carried by the air, to flow more smoothly, with less resistance, significantly reducing the inhalation resistance during inhalation and improving the inhalation experience.

[0115] In one embodiment, referring to FIG. 1 and FIG. 2 , the number of the airway 1 a may be one.

[0116] In one embodiment, referring to Figures 3 and 4 , there are multiple air channels 1a, which are spaced apart. On the one hand, the multiple air channels 1a can further increase the porosity of the aerosol-generating matrix, facilitating heat penetration and / or diffusion and reducing aerosol flow resistance. On the other hand, the spaced-apart arrangement of the multiple air channels 1a, i.e., the presence of dielectric walls between each air channel 1a, allows for a smaller pore size in each air channel 1a, ensuring optimal dielectric quality and improving the structural strength of the base 1.

[0117] In one embodiment, the air channel 1a is a linear air channel 1a extending in a straight line. The linear air channel 1a is easy to form, which can reduce the manufacturing difficulty. The flow resistance of the airflow in the linear air channel 1a is relatively small.

[0118] In one embodiment, the airway 1a is a curved airway 1a, wherein at least a portion of the aperture of the curved airway 1a is curved with a non-zero curvature. The curved airway 1a can significantly increase the flow path of the airflow without significantly increasing the length of the aerosol-generating substrate, thereby extending the contact time between the airflow and the aperture wall of the curved airway 1a and improving the aerosol extraction rate.

[0119] In one embodiment, the curved airway 1a is helical. That is, the three-dimensional shape of the curved airway 1a is a spatial helical shape. A line connecting any point of the helical curved airway 1a and its starting point is inclined at an angle relative to its axis. The helical curved airway 1a can significantly extend the airflow path, allowing aerosol to precipitate from the aerosol-generating matrix into the curved airway 1a, increasing the aerosol's flow velocity within the aerosol-generating matrix and thereby increasing the impact of the airflow. This allows the aerosol to be evenly mixed, improving aerosol uniformity and enhancing the user's puffing experience.

[0120] There is no restriction on the projected shape of the airway 1a. For example, the projected shape of the airway 1a can be circular, polygonal (including but not limited to triangle, square, prism, etc.), elliptical, runway-shaped or irregular, etc., where irregular refers to other symmetrical or asymmetrical shapes other than the shapes listed above.

[0121] It should be noted that, in the implementation of this application, unless otherwise specified, the projection surface refers to a plane perpendicular to the third direction.

[0122] In one embodiment, referring to FIG. 3 and FIG. 4 , the base portion 1 includes a circular air channel 1 a and a plurality of sector-shaped air channels 1 a , and the plurality of sector-shaped air channels 1 a are arranged at intervals around the circular air channel 1 a .

[0123] It is understandable that the multiple air channels 1a may also be arranged in a one-dimensional arrangement, a two-dimensional matrix arrangement, or a plurality of concentric circles, etc. The arrangement of the multiple air channels 1a is not limited.

[0124] For example, in one embodiment, the number of air channels 1a is four, each of which is fan-shaped and evenly distributed. Thus, the projection of the dielectric wall within the base portion 1 is roughly a cross. In another embodiment, the number of air channels 1a is eight, each of which is fan-shaped and evenly distributed. Thus, the projection of the dielectric wall within the base portion 1 is roughly a "M" shape.

[0125] It should be noted that micropores may exist within the aerosol-generating matrix. For example, in the aerosol-generating matrix of a particle assembly, the gaps between the particles constitute the micropores. However, the airway 1a described in this application is different from the micropores. The airway 1a described in this application is a pore in the macroscopic sense, while the micropores are pores in the microscopic sense. The projected area and length of the airway 1a are much larger than those of the micropores. The airway 1a is primarily formed by design and processing, such as by die processing. Therefore, the projected area and length of the airway 1a can be changed according to design requirements, while the size of the micropores is determined by the gaps between the particles. For example, if the material is a granular material, the aerosol-generating matrix formed by extrusion of the material has micropores. The projected area and length of the micropores are naturally formed by the extrusion process and the material composition. The micropores can be formed by a certain expansion of the material after it flows out of the die.

[0126] In one embodiment, at least some of the subunits 2 are made of the same material. For example, some of the subunits 2 may be made of the same material, while others may be made of different materials. Another example is that all of the subunits 2 may be made of the same material. This simplifies the manufacturing equipment. For example, in the extrusion process, the extruder structure is simple.

[0127] In one embodiment, all subunits 2 may be made of different materials. In this way, different subunits 2 can release aerosols of different flavors, providing more options.

[0128] In one embodiment, at least some of the subunits 2 have the same projected shape. For example, some of the subunits 2 may have different projected shapes, while another portion of the subunits 2 may have the same projected shape. In another example, all of the subunits 2 may have the same projected shape. This allows the die structure of the extruder, such as the die, to be simple.

[0129] In one embodiment, the projection shapes of all subunits 2 may be different. In this way, a more refreshing or mellow taste can be provided, and different heating methods can be matched to provide a richer taste.

[0130] In one embodiment, the volumes of all gap spaces 2a may be the same.

[0131] In one embodiment, at least some of the gap spaces 2a have different volumes. For example, some of the gap spaces 2a may have different volumes, while other parts of the gap spaces 2a may have the same volume. For another example, all of the gap spaces 2a may have different volumes.

[0132] In one embodiment, at least some of the subunits 2 are evenly distributed along the second direction. For example, some of the subunits 2 are evenly distributed along the second direction, while other subunits 2 are unevenly distributed along the second direction. For another example, all of the subunits 2 are evenly distributed along the second direction. With this design, the medium mass distribution in different parts of the aerosol generating matrix approaches the same, and the gap spaces 2a in different parts of the aerosol generating matrix approach the same, so that the aerosol release amount and flow resistance in different parts of the aerosol generating matrix approach the same. This improves the uniformity of aerosol release during the puffing process, and the puff amount per puff during the puffing process approaches the same, thereby improving the puffing consistency and providing a good puffing experience.

[0133] For example, in some embodiments, referring to Figures 1 to 6 , the uniform distribution of the subunits 2 along the second direction includes: the projected shapes of the subunits 2 are identical, and the projected shapes of the interstitial spaces 2a are identical. For example, the projected shapes of the subunits 2 are identical, and the subunits 2 are distributed one-dimensionally along the plate-shaped base portion 1 or concentrically around the cylindrical base portion 1. In other words, the subunits 2 are arranged uniformly.

[0134] In one embodiment, all subunits 2 are unevenly distributed along the second direction. Thus, the unevenly distributed subunits 2 can be combined with different heating methods according to puffing requirements, thereby achieving not only uniform heating of the aerosol-generating matrix but also ensuring aerosol consistency at the beginning and end of the puff process.

[0135] In some embodiments, the functional segment may only be provided with a filtering segment.

[0136] In other embodiments, the functional section further includes a cooling section, located between the filtration section and the aerosol-generating matrix. The cooling section is used to cool the aerosol before filtering it by the filtration section. The cooling section can reduce the "burning mouth" phenomenon when the user inhales the aerosol.

[0137] The cooling materials used in the cooling section include but are not limited to one or more combinations of PE (polyethylene), PLA (Polylactic Acid), PBAT (Polybutylene Adipate Terephthalate), PP (Polypropylene), acetate fiber, acrylic fiber and the like.

[0138] The filter material used in the filter section includes but is not limited to one or more combinations of PE (polyethylene), PLA (Polylactic Acid), PBAT (Polybutylene Adipate Terephthalate), PP (Polypropylene), acetate fiber, acrylic fiber and the like.

[0139] The materials of the cooling section and the filtering section can be the same or different.

[0140] In one embodiment, the aerosol-generating substrate includes plant raw materials, auxiliary raw materials, smoke-generating agent raw materials, adhesive raw materials, and flavor raw materials.

[0141] Plant materials are used to generate aerosols when heated. Auxiliary raw materials provide a skeletal support for the plant materials. Smoke-generating agent raw materials are used to generate large amounts of smoke when heated. Adhesive raw materials are used to bond the component raw materials. Flavoring raw materials provide a characteristic aroma. In this way, the plant materials and smoke-generating agent raw materials ensure aerosol production, while the flavoring raw materials enhance the release of aroma during inhalation, improving the user experience. Auxiliary raw materials not only improve the fluidity of the mixture but also make the aerosol-generating matrix porous, facilitating aerosol extraction and flow. The adhesive raw material ensures a stable mixture of the plant material powder and auxiliary materials, preventing a loose structure.

[0142] In one embodiment, the plant raw material is one or more combinations of crushed tobacco leaves, tobacco leaf fragments, tobacco stems, tobacco dust, and flavorful plants, resulting in powder. The plant raw material is the core source of flavor. Endogenous substances in the plant raw material can produce a physiological sense of satisfaction in the user. Endogenous substances, such as alkaloids, enter the human bloodstream and stimulate the pituitary gland to produce dopamine, thereby achieving a physiological sense of satisfaction.

[0143] In one embodiment, the auxiliary agent raw material can be one or more combinations of inorganic fillers, lubricants, and emulsifiers. Inorganic fillers include one or more combinations of heavy calcium carbonate, light calcium carbonate, zeolite, attapulgite, talc, and diatomaceous earth. Inorganic fillers can provide skeletal support for the plant material and also have micropores, which can increase the porosity of the aerosol-generating matrix, thereby improving the aerosol release rate.

[0144] Lubricants include one or more of candelilla wax, carnauba wax, shellac, sunflower wax, rice bran, beeswax, stearic acid, and palmitic acid. Lubricants can increase the fluidity of the plant material powder, reduce friction between the plant material powders, and make the overall density of the plant material powder distribution more uniform. They can also reduce the pressure required during the extrusion process and reduce die wear.

[0145] Emulsifiers include one or more combinations of polyglycerol fatty acid esters, Tween-80, and polyvinyl alcohol. Emulsifiers can, to a certain extent, slow down the loss of flavor substances during storage, increase the stability of flavor substances, and improve the sensory quality of the product.

[0146] In one embodiment, the smoke-generating agent raw material may include: a monohydric alcohol (such as menthol); a polyhydric alcohol (such as propylene glycol, glycerol, triethylene glycol, 1,3-butylene glycol and tetraethylene glycol); an ester of a polyhydric alcohol (such as triacetin, triethyl citrate, a mixture of diacetin esters, triethyl citrate, benzyl benzoate, tributyrin); a monocarboxylic acid; a dicarboxylic acid; a polycarboxylic acid (such as lauric acid, myristic acid) or an aliphatic ester of a polycarboxylic acid (such as dimethyl dodecanedioate, dimethyl tetradecanedioate, erythritol, 1,3-butylene glycol, tetraethylene glycol, triethyl citrate, propylene carbonate, ethyl laurate, triactin, meso-erythritol, a mixture of diacetin esters, diethyl suberate, triethyl citrate, benzyl benzoate, benzyl phenylacetate, ethyl vanillate, tributyrin, lauryl acetate) or one or more combinations thereof.

[0147] In one embodiment, the binder material wetting the interface with the component materials creates close contact, generating intermolecular attraction, thereby bonding the component materials, such as powders and liquids. The binder material can be a natural plant extract, a non-ionically modified viscous polysaccharide, or a combination thereof, including tamarind polysaccharide, guar gum, and modified cellulose (e.g., carboxymethyl cellulose). The binder serves to bond the particles together, preventing them from loosening. Furthermore, it improves the water resistance of the aerosol-generating matrix and is harmless to the human body.

[0148] In one embodiment, the flavoring raw materials are solid or liquid substances used to provide characteristic aromas, such as hay, roasted sweet, or nicotine. The flavoring raw materials may include one or more combinations of tobacco, aromatic plant extracts, extracts, essential oils, and absolutes. The flavoring raw materials may also include monomeric flavoring substances, such as one or more combinations of megastigmatrienone, neophytadiene, geraniol, and nerol.

[0149] In the description of this application, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in further embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in this application and features of different embodiments or examples, unless they are mutually inconsistent.

[0150] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application are intended to be within the scope of protection of the present application.

Claims

1. An aerosol generating substrate comprising: Basic Department; A plurality of subunits are located outside the base portion along a first direction, and the plurality of subunits are spaced apart along a second direction of the base portion, and a space between two adjacent subunits is a gap space, wherein the first direction intersects with the second direction.

2. The aerosol generating substrate according to claim 1, wherein the subunit comprises a first portion and a second portion, the second portion and the first portion are arranged along a first direction, and a size of the first portion along the second direction is greater than a size of the second portion along the second direction; The second portion connects the base portion and the first portion, or the first portion connects the base portion and the second portion.

3. The aerosol generating substrate according to claim 2, wherein the subunit comprises one first part and a plurality of second parts, the plurality of second parts are arranged at intervals along the second direction and are located on the inner side of the first part, and the second part connects the base part and the first part. 4 . The aerosol generating substrate according to claim 2 , wherein a distance between two adjacent first portions along the second direction is a first distance, and a ratio of a size of the first portion along the second direction to the first distance is between 10:1 and 1:

1.

5. An aerosol-generating substrate according to claim 2, wherein the wall thickness of the first portion is from 0.1 mm to 0.5 mm.

6. An aerosol-generating substrate according to claim 2, wherein the dimension of the second portion along the first direction is from 0.5 mm to 5 mm. 7 . The aerosol-generating substrate of claim 2 , wherein a ratio of a dimension of the first portion along the second direction to a dimension of the second portion along the first direction is from 1:2 to 2:

1.

8. The aerosol-generating substrate of claim 1, wherein the difference between the maximum wall thickness and the minimum wall thickness of the aerosol-generating substrate is a first difference, and the percentage of the first difference to the minimum wall thickness of the aerosol-generating substrate is 0% to 100%. 9 . The aerosol generating substrate according to claim 1 , wherein the hydraulic diameter of the projection shape of the aerosol generating substrate is 5 mm to 15 mm, taking the plane perpendicular to the third direction as the projection surface.

10. The aerosol-generating substrate of claim 1, wherein the number of the subunits is between 6 and 30. 11 . The aerosol generating substrate according to claim 1 , wherein a minimum distance between two adjacent subunits along the second direction is 0.1 mm to 1 mm.

12. The aerosol generating substrate according to claim 1, wherein taking a plane perpendicular to the third direction as a projection surface, a total projection area of ​​all the subunits and a total projection area of ​​all the gap spaces are between 1:9 and 1:

1.

13. The aerosol generating substrate according to claim 1, wherein the base portion is in a plate-like structure, and a wall thickness direction of the base portion is consistent with the first direction; or The base part is in a cylindrical structure. 14 . The aerosol-generating substrate according to claim 1 , wherein an air passage is formed inside the base portion and passes through at least one end thereof along the third direction.

15. The aerosol generating substrate according to claim 14, wherein the number of the air channels is plural, and the plurality of the air channels are arranged at intervals.

16. The aerosol generating substrate according to claim 1, wherein a heat generating layer is arranged on the outer side of the aerosol generating substrate, the heat generating layer is arranged on the outer surface of the subunit and can heat the subunit; and / or, Taking the plane perpendicular to the third direction as the projection plane, the projection shape of the aerosol generating substrate is circular, elliptical or polygonal.

17. The aerosol generating substrate according to claim 1, wherein the subunit is located at the outermost side of the aerosol generating substrate along the first direction; and / or Taking the plane perpendicular to the third direction as the cross section, the cross section at any position of the subunit is the same, wherein, The first direction and the third direction are perpendicular to each other.

18. The aerosol generating substrate according to claim 1, wherein the first direction and the second direction are perpendicular to each other; or The first direction is the radial direction, and the second direction is the circumferential direction.

19. An aerosol generating article comprising: The aerosol-generating substrate according to any one of claims 1 to 18; The functional segment is arranged at one end of the aerosol generating substrate along the third direction, and the functional segment at least includes a filtering segment for filtering aerosol.

20. An electronic atomization device, comprising: The aerosol generating article of claim 19; A heating element is arranged on the outer side of the subunit along the first direction, and the heating element is used to heat the aerosol generating substrate to generate aerosol. The electronic atomization device according to claim 20 , wherein the heating element is a laser heater.

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