Aerosol-forming substrates and aerosol-forming products

Abstract

The present application provides an aerosol-generating substrate and an aerosol-generating product, wherein the aerosol-generating substrate has a plurality of airway holes therein, each of which penetrates at least one end of the aerosol-generating substrate along its length, and the airway holes are formed in the aerosol-generating substrate in a non-uniformly distributed manner. The aerosol-generating substrate in the present application can reduce the resistance to inhalation and improve the uniformity of each inhalation.

Description

[Technical Field]

[0001] This application is based on and claims priority to a Chinese patent application bearing application number 202310079543.6, filed with the China Patent Office on January 20, 2023, the entire contents of which are incorporated herein by reference.

[0002] FIELD OF THE INVENTION This application relates to the technical field of smoke-generating products, and in particular to aerosol-forming substrates and aerosol-generating products. [Background technology]

[0003] Smoke-generating products include those that form an aerosol by combustion and those that form an aerosol by a non-combustion method. A typical non-combustion method smoke-generating product contains an aerosol-generating substrate, such as a tobacco material, a flavoring material, and / or an atomizing agent, that can volatilize when heated to generate an aerosol. The aerosol-generating substrate is heated using an external heat source to a temperature that is not high enough to cause combustion but is still capable of releasing an aerosol. The substrate contains a large amount of atomizing agent, and the atomizing agent is released by high-temperature heating during use, forming an aerosol.

[0004] In the prior art, when inhaling smoke-generating products, the resistance to inhalation is high, and the amount of smoke produced varies greatly with each inhalation. Summary of the Invention

[0005] In light of this, the embodiments of the present application aim to provide an aerosol-generating substrate and an aerosol-generating product that reduce the resistance to inhalation and improve uniformity with each inhalation.

[0006] To achieve the above object, an embodiment of the present application provides an aerosol-generating substrate, the interior of which has a plurality of airway holes, each of which penetrates at least one end of the aerosol-generating substrate along its length, and the airway holes are formed in the aerosol-generating substrate in a non-uniformly distributed manner.

[0007] In one embodiment, each of the airway holes penetrates opposite ends of the aerosol-generating substrate in the longitudinal direction, and the cross-sectional shape of the aerosol-generating substrate is circular in a plane perpendicular to the longitudinal direction of the aerosol-generating substrate.

[0008] In one embodiment, all of the airway holes are distributed on multiple trajectory lines, where each of the airway holes on a single trajectory line is linearly arranged along the first direction Z1, and multiple trajectory lines are arranged along a second direction Z2, and the first direction Z1 and the second direction Z2 are not parallel.

[0009] In one embodiment, each of the airway holes on a single trajectory line is arranged along a circumferential direction surrounding the center of the aerosol-generating substrate, and multiple trajectory lines are arranged non-uniformly along the radial direction of the aerosol-generating substrate.

[0010] In one embodiment, the airway holes on a single locus line are arranged in an overlapping arrangement, and along the radial direction of the aerosol-generating substrate, the hole diameter of the airway hole on the outermost single locus line away from the center of the aerosol-generating substrate is larger than the hole diameter of the airway hole on the innermost single locus line, or the hole diameter of the airway hole on the innermost single locus line close to the center of the aerosol-generating substrate is larger than the hole diameter of the airway hole on the outermost single locus line.

[0011] In one embodiment, the airway holes on a single trajectory line are arranged in an overlapping arrangement, and the pore diameter of the airway holes on each trajectory line gradually increases or gradually decreases as the airway holes move radially outward along the aerosol-generating substrate.

[0012] In one embodiment, the airway holes on a single trajectory line are arranged in an overlapping arrangement, and the wall thickness of the partition between the airway holes on two adjacent trajectory lines gradually increases or gradually decreases radially outward along the aerosol-generating substrate.

[0013] In one embodiment, each of the airway holes on a single trajectory line is arranged linearly along a first direction Z1, and multiple trajectory lines are arranged parallel to a second direction Z2, and the first direction Z1 and the second direction Z2 are perpendicular.

[0014] In one embodiment, along the axial direction of the aerosol-generating substrate, the pore size of each of the airway holes gradually increases or decreases from the center to the opposite ends, or the pore size of each of the airway holes gradually increases from one end of the aerosol-generating substrate to the opposite other end.

[0015] In one embodiment, the interior of the aerosol-generating substrate has a first region and a second region, and all of the airway pores are distributed within the first region.

[0016] In one embodiment, the cross-sectional shape of the aerosol-generating substrate in a plane perpendicular to the length of the aerosol-generating substrate is elliptical, track-shaped or polygonal.

[0017] In one embodiment, the cross-sectional shape of the airway stoma is circular, oval, track-shaped, sector-shaped, or polygonal.

[0018] In one embodiment, the aerosol-generating substrate has an airway groove formed in its outer wall, the airway groove penetrating at least one end along the length of the aerosol-generating substrate.

[0019] In one embodiment, in a plane perpendicular to the length of the aerosol-generating substrate, the cross-sectional shape of the airway groove is the same as the local shape of the airway stoma.

[0020] In one embodiment, the cross-sectional shape of the airway groove in a plane perpendicular to the length of the aerosol-generating substrate is arc-shaped, rectangular or trapezoidal.

[0021] In one embodiment, the functional segment further comprises a temperature-reducing segment, the temperature-reducing segment being located between the filter segment and the aerosol-generating substrate.

[0022] Examples of the present application further provide an aerosol-generating product, the aerosol-generating product comprising: the aerosol-generating substrate; a functional segment provided at one end of the aerosol-generating substrate along its length, the functional segment including at least a filter segment for filtering the aerosol; and an outer coating layer that surrounds the functional segment and the circumferential exterior of the aerosol-generating substrate.

[0023] Examples of the present application provide an aerosol-generating substrate and an aerosol-generating product, in which the aerosol-generating substrate has a plurality of airway holes formed therein, each of which penetrates at least one end of the substrate along its length and is distributed unevenly throughout the substrate. When the aerosol-generating substrate is heated and atomized, the aerosol-generating substrate receives heat and releases an aerosol. The aerosol escapes through gaps or pores in the partitions between the airway holes, is collected in the airway holes, and is transported to the suction end by the action of negative suction pressure. In other words, the provision of a plurality of airway holes increases the surface area of ​​the aerosol-generating substrate (the side walls of the airway holes correspond to part of the surface of the aerosol-generating substrate), allowing the heat of the aerosol-generating substrate to enter the substrate from its outer surface, improving heating efficiency compared to related art structures that use direct conduction within the substrate. Furthermore, in combination with the different heating methods, the airway holes are formed in the aerosol-generating substrate in a non-uniformly distributed manner, i.e., by adjusting the hole diameter of the airway holes, the wall thickness of the partitions between adjacent airway holes, etc. according to the different heating methods, the mass per unit volume in different regions of the aerosol-generating substrate can be adjusted, thereby realizing uniform heating of the aerosol-generating substrate and maintaining the consistency of aerosol release, i.e., the consistency of aerosol between inhalations, thereby improving the user's smoking experience. In other words, the aerosol-generating substrate in the embodiments of the present application can improve the user's smoking experience. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a structural schematic diagram of a first aerosol-generating product according to an embodiment of the present application. [Figure 2] 2 is a cross-sectional view of the aerosol-generating product shown in FIG. 1. [Figure 3] FIG. 2 is a structural schematic diagram of a second type of aerosol-generating product according to an embodiment of the present application. [Figure 4] 1 is a schematic diagram of the structure of a first type of aerosol-generating substrate in an embodiment of the present application. [Figure 5]FIG. 1 is a schematic structural diagram of a second type of aerosol-generating substrate in an embodiment of the present application. [Figure 6] FIG. 1 is a schematic structural diagram of a third type of aerosol-generating substrate in an embodiment of the present application. [Figure 7] FIG. 1 is a schematic structural diagram of a fourth type of aerosol-generating substrate in an embodiment of the present application. [Figure 8] FIG. 1 is a schematic structural diagram of a fifth type of aerosol-generating substrate in an embodiment of the present application. [Figure 9] 1 is a schematic diagram of the structure of a sixth type of aerosol-generating substrate in an embodiment of the present application. [Figure 10] FIG. 1 is a schematic structural diagram of a seventh type of aerosol-generating substrate in an embodiment of the present application. [Figure 11] FIG. 1 is a schematic structural diagram of the eighth type of aerosol-generating substrate in an embodiment of the present application. [Figure 12] FIG. 1 is a schematic structural diagram of the ninth type of aerosol-generating substrate according to an embodiment of the present application. [Figure 13] FIG. 1 is a schematic diagram of the structure of the tenth type of aerosol-generating substrate in the examples of the present application. [Figure 14] FIG. 11 is a structural schematic diagram of an eleventh type of aerosol-generating substrate according to an embodiment of the present application. [Figure 15] FIG. 1 is a schematic diagram of the structure of the 12th type of aerosol-generating substrate in an example of the present application. [Figure 16] FIG. 12 is a structural schematic diagram of the thirteenth type of aerosol-generating substrate in the examples of the present application. [Figure 17] FIG. 1 is a schematic diagram of the structure of the 14th type of aerosol-generating substrate in the examples of the present application. [Figure 18] FIG. 1 is a structural schematic diagram of the 15th type of aerosol-generating substrate in an example of the present application. [Figure 19] FIG. 1 is a schematic diagram of the structure of the 16th type of aerosol-generating substrate in an example of the present application. [Figure 20] FIG. 2 is a cross-sectional view of a third type of aerosol-generating product according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0025] It should be noted that, unless inconsistent, the examples in this application and the technical features in the examples can be combined with each other, and the detailed description of the specific embodiments should be understood to be for the purpose of explaining the gist of this application and should not be considered as an undue limitation on this application.

[0026] One embodiment of the present application provides an aerosol-generating product. Referring to Figures 1 to 3, the aerosol-generating product 100 includes a functional segment 20, an outer coating layer 30, and an aerosol-generating substrate 10. The functional segment 20 is provided at one end along the length of the aerosol-generating substrate 10, and includes at least a filter segment for filtering the aerosol. The filter segment is also called a filter tip.

[0027] The outer coating layer 30 surrounds the functional segments 20 and the aerosol-generating substrate 10 from the outside.

[0028] The aerosol-generating product 100 is used in combination with an electronic atomization device having a heating assembly, specifically, the heating assembly heats and atomizes the aerosol-generating substrate 10 to generate an aerosol, which is then inhaled by the user after being filtered by the filter segment of the functional segment 20.

[0029] It should be noted that the aerosol-generating product 100 generates the aerosol through the aerosol-generating substrate 10, and the functional segment 20 does not generate the aerosol.

[0030] The aerosol-generating product of the embodiment of the present application may be adapted for inhalation by a heating and combustion method or by a heating and non-combustion method. In the embodiment of the present application, the aerosol-generating product 100 is described as being adapted for inhalation by a heating and non-combustion method.

[0031] There are various heating methods for the heating assembly, and exemplary heating methods include central heating, peripheral heating, and bottom heating. The central heating method refers to a method in which a heating assembly is inserted into the aerosol-generating product 100 and heats the aerosol-generating product 100 by toasting it from the inside out. The peripheral heating method refers to a method in which a heating assembly is placed around the outside of the aerosol-generating product 100 and heats it by toasting it from the outside in. The bottom heating method refers to a method in which the heating assembly is used to first heat the air, and then the hot air heats the aerosol-generating product 100 from below up. Specific examples of these heating methods include resistance heating, electromagnetic heating, infrared heating, microwave heating, laser heating, etc., and are not particularly limited herein.

[0032] The functional segment 20 may be provided with only a filter segment 21 as shown in Figure 2, or may be provided with a filter segment 21 and a temperature reduction segment 22 as shown in Figure 20. In the case of a functional segment 20 provided with a temperature reduction segment 22, the temperature reduction segment 22 is provided between the filter segment 21 and the smoke generating medium structure 10 and is used to reduce the temperature of the aerosol before the filter segment 21 filters the aerosol.

[0033] Here, the temperature reduction segment is used to perform a temperature reduction process on the aerosol before the filter segment filters the aerosol, thereby reducing the temperature of the aerosol and improving the phenomenon of the "mouth feeling hot" when the user inhales the aerosol.

[0034] In some embodiments, the functional segment 20 may further comprise a support segment, which has a certain structural strength and restricts axial movement of the aerosol-generating substrate 10. Specifically, when the aerosol-generating product 100 is inserted into a heating chamber in an electronic atomization device or when a heating element is inserted into the aerosol-generating substrate 10, the support segment applies a counterforce to the aerosol-generating substrate 10, thereby preventing axial movement of the aerosol-generating substrate 10.

[0035] Another embodiment of the present application further provides an aerosol-generating substrate 10 for use in the aerosol-generating product described in the embodiments of the present application. Referring to Figures 4 to 17, the aerosol-generating substrate 10 has a plurality of airway holes 10a formed therein, each of which penetrates at least one end of the aerosol-generating substrate 10 along its length. That is, the airway holes 10a extend in the longitudinal direction of the aerosol-generating substrate 10, and the airway holes 10a are formed in the aerosol-generating substrate 10 in a non-uniformly distributed manner.

[0036] The phrase "unevenly distributed" of airway fistulas 10a refers to the arrangement of the airway fistulas 10a being uneven, and includes airway fistulas 10a being distributed in a matrix or concentric pattern.

[0037] The pore walls of the airway holes 10a form the surface of the aerosol-generating substrate 10, and the airway holes 10a can increase the surface area of ​​the aerosol-generating substrate 10, facilitating heat transfer and improving heating efficiency. In addition, the aerosol flows out of the pores and is collected in the airway holes 10a, and is transported to the suction end by the action of negative suction pressure, reducing the inhalation resistance of the user and improving the user experience.

[0038] For example, the aerosol-generating substrate 10 is a particle conjugate, a type of reconstituted tobacco medium, for example, a reconstituted tobacco medium containing components such as a smoke-generating agent and tobacco. The aerosol-generating substrate 10 has a monolithic structure, which can be formed by, for example, injection molding, compression molding, or extrusion. Here, extrusion refers to a processing method in which a raw material mixture is fed into an extruder, and the material is heated and shaped by the action between the barrel and screw of the extruder while being extruded forward by the screw, and the material passes continuously through a die to produce products or semi-finished products with various cross sections. The aerosol-generating substrate formed by extrusion is rod-shaped. Because the aerosol-generating substrate 10 has a monolithic structure, it remains a monolithic medium after being heated and sucked, or after heat exposure is stopped, and does not collapse or fall off. This solves the problems of thread-like or particulate aerosol-generating substrates 10 in the prior art, such as falling off threads and difficulty in cleaning.

[0039] Furthermore, pores are formed between the particles of the particle aggregate, and the pores are connected to form micro-airways that communicate with the airway holes 10a. The airway holes 10a penetrate both ends of the medium, allowing air to enter evenly and collecting and transmitting aerosols. The reconstituted tobacco medium, which contains ingredients such as smoke-generating agents and tobacco, receives heat and releases aerosols. The aerosols are collected in the airway holes 10a through the gaps or pores between the wall materials and then transported to the suction end by the action of negative suction pressure.

[0040] There are several ways in which the airway holes 10a can be distributed unevenly on the aerosol-generating substrate 10, for example, they can be arranged unevenly along the radial direction of the aerosol-generating substrate 10 or along the longitudinal direction of the aerosol-generating substrate 10.

[0041] The airway holes 10a may be distributed unevenly on the aerosol-generating substrate 10. For example, the mass per unit volume of the aerosol-generating substrate 10 may be gradually decreased as the distance from the heat source increases, i.e., the closer to the heat source the aerosol-generating substrate 10 is, the greater the mass per unit volume (the greater the density of the smoke-generating medium), and the farther from the heat source the aerosol-generating substrate 10 is, the smaller the mass per unit volume (the smaller the density of the smoke-generating medium). This delays the heating of the aerosol-generating substrate 10 at locations farther from the heat source, improving the uniformity of the aerosol emitted by the aerosol-generating substrate 10 and increasing the duration or number of inhalations, thereby improving the user experience.

[0042] By providing the airway holes 10a inside the aerosol-generating substrate 10, the surface area of ​​the aerosol-generating substrate 10 is increased, the heating efficiency is improved, and the user's inhalation experience is enhanced.

[0043] The aerosol-generating substrate provided in the embodiments of the present application has a plurality of airway holes 10a inside, each of which penetrates at least one end of the aerosol-generating substrate 10 along its length and is distributed non-uniformly throughout the aerosol-generating substrate 10. When the aerosol-generating substrate 10 is heated and atomized, the aerosol-generating substrate 10 receives heat and releases aerosol. The aerosol escapes through gaps or pores in the partitions between the airway holes 10a, is collected in the airway holes 10a, and is transported to the suction end by the action of negative suction pressure. In other words, the provision of a plurality of airway holes 10a increases the surface area of ​​the aerosol-generating substrate 10 (the side walls of the airway holes 10a correspond to part of the surface of the aerosol-generating substrate 10). This allows heat from the aerosol-generating substrate 10 to enter the substrate 10 from its surface, improving heating efficiency compared to the related art structure in which heat is directly conducted inside the substrate 10. Furthermore, in combination with the different heating methods, the airway holes 10a are distributed non-uniformly on the aerosol-generating substrate 10. That is, by adjusting the diameter of the airway holes 10a, the wall thickness of the partitions between adjacent airway holes 10a, etc. according to the different heating methods, the mass per unit volume in different regions of the aerosol-generating substrate 10 can be adjusted, thereby realizing uniform heating of the aerosol-generating substrate 10 and maintaining the consistency of aerosol release, i.e., the consistency of aerosol inhaled back and forth, thereby enhancing the user's smoking experience. In other words, the aerosol-generating substrate in the embodiments of the present application can improve the user's smoking experience.

[0044] An outer coating layer 30 surrounds the outer circumferential surface of the functional segments 20 and the aerosol-generating substrate 10 .

[0045] The material of the outer coating layer 30 is not limited, and may include, but is not limited to, one or more combinations of materials such as fiber paper, metal foil, metal foil composite fiber paper, polyethylene composite fiber paper, PE, and PBAT.

[0046] In some embodiments, referring to Figure 2, the functional segment 20 includes only the filter segment 21. In other embodiments, referring to Figure 20, in addition to the filter segment 21, the functional segment 20 further includes a support segment and / or a temperature-reducing segment 22, which is disposed between the aerosol-generating substrate 10 and the filter segment 21.

[0047] Here, the temperature reduction segment 22 is used to perform a temperature reduction process on the aerosol before the filter segment 21 filters the aerosol, thereby lowering the temperature of the aerosol and improving the phenomenon of the "mouth feeling hot" when the user inhales the aerosol.

[0048] Materials for the temperature reduction segment 22 include, but are not limited to, one or more combinations of polyethylene (PE), polylactic acid (also known as polylactide) (PLA), polybutyleneadipate-co-terephthalate (PBAT), polypropylene (PP), acetate fiber, and propylene fiber materials.

[0049] The filter segment materials may include, but are not limited to, one or more combinations of polyethylene (PE), polylactic acid (also known as polylactide) (PLA), polybutyleneadipate-co-terephthalate (PBAT), polypropylene (PP), acetate fiber, and propylene fiber materials.

[0050] The temperature reduction segment 22 and the filter segment may be made of the same or different materials.

[0051] The support segments have a certain structural strength and restrict axial movement of the aerosol-generating substrate 10. Specifically, when the aerosol-generating product 100 is inserted into the heating chamber 200a in the aerosol-generating device 200, or when a heating element is inserted into the aerosol-generating substrate 10, the support segments apply a reaction force to the aerosol-generating substrate 10, thereby preventing the aerosol-generating substrate 10 from moving in the axial direction.

[0052] The specific components of the aerosol-generating substrate 10 are not limited herein, and by way of example, in one embodiment, the aerosol-generating substrate 10 may include a botanical component, an adjuvant component, a smoke-generating agent component, an adhesive component, etc.

[0053] In one embodiment, the plant ingredients are one or more of a combination of powders formed by grinding raw tobacco leaves, tobacco leaf fragments, tobacco stems, tobacco powder, flavor plants, etc. The plant ingredients are the main source of flavor for the product, and endogenous substances in the plant ingredients, such as nicotine, enter the human bloodstream through aerosolization, stimulating the pituitary gland to produce dopamine, thereby providing physiological satisfaction.

[0054] In one embodiment, the auxiliary component may be one or more combinations of inorganic fillers, lubricants, and emulsifiers. Here, the inorganic fillers include one or more combinations of ground calcium carbonate, light calcium carbonate, zeolite, attapulgite, talc, and diatomaceous earth. The inorganic fillers can provide skeletal support for the plant components. At the same time, the inorganic fillers also have pores, which can increase the porosity of the wall material after the plant components are molded, thereby improving the aerosol release rate.

[0055] The lubricant may be one or more of the following: candelilla wax, carnauba wax, shellac, sunflower wax, rice bran, beeswax, stearic acid, palmitic acid. The lubricant can improve particle flow, reduce inter-particle friction, make the particle distribution more uniform, reduce the pressure required for molding, and reduce mold wear.

[0056] Emulsifiers include one or more combinations of polyglycerol fatty acid esters, Tween-80, and polyvinyl alcohol. Emulsifiers can, to a certain extent, mitigate flavor loss during storage, enhance flavor stability, and improve the sensory quality of products. Emulsifiers (also known as surfactants) can reduce the interfacial tension between water-soluble and water-insoluble components in a mixed system, forming a strong thin film on the surface of microdroplets, or forming an electric double layer on the surface of microdroplets due to the electric charge imparted by the emulsifier, thereby preventing the microdroplets from coagulating and maintaining a uniform emulsion. The homogeneous emulsion of two incompatible components can improve the consistency of product quality.

[0057] In one embodiment, the function of the smoke generant component is to generate a large amount of vapor upon heating, thereby improving the aerosol yield of the smoke-generating product. The smoke generant may, for example, include one or more combinations of monohydric alcohols (e.g., menthol), polyhydric alcohols (e.g., propylene glycol, triethylene glycol, 1,3-butanediol, and glycerin), esters of polyhydric alcohols (e.g., monoacetin, diacetin, triacetin), monocarboxylic acids, polycarboxylic acids (e.g., lauric acid, myristic acid), or aliphatic esters of polycarboxylic acids (e.g., dimethyl dodecanedioate, dimethyl tetradecanedioate, erythritol, 1,3-butanediol, tetraethylene glycol, triethyl citrate, propylene carbonate, ethyl laurate, triactin, mesoerythritol, diacetin mixtures, diethyl suberate, triethyl citrate, benzyl benzoate, benzyl phenylacetate, ethyl vanillate, tributyrin, and lauryl acetate).

[0058] In one embodiment, the adhesive component is a non-ionized modified viscous polysaccharide extracted from a natural plant, and may include one or more combinations of tamarind polysaccharide, pullulan, seaweed polysaccharide, locust bean gum, guar gum, and xyloglucan. The adhesive wets the interfaces of the product's constituent materials, creating intimate contact and intermolecular attraction, thereby adhering the powders, liquids, and other constituent materials. At the same time, the selection of a non-ionized adhesive extracted from a natural plant can avoid the release of harmful substances such as methanol, formaldehyde, and acrolein that are caused by colloidal modification, thereby improving product safety.

[0059] In some embodiments, referring to Figure 18, the airway holes 10a run through the same end along the length of the aerosol-generating substrate 10, with all other ends being closed.

[0060] In some other embodiments, referring to Figure 19, some airway holes 10a penetrate one end of the aerosol-generating substrate 10 along its length, and some other airway holes 10a penetrate the other end of the aerosol-generating substrate 10 along its length.

[0061] 4 to 13, in some other embodiments, each airway hole 10a penetrates both ends along the length of the aerosol-generating substrate 10. It can be understood that having the airway holes 10a penetrate both ends along the length of the aerosol-generating substrate 10 is more advantageous in reducing the resistance to inhalation for the user than having the airway holes 10a penetrate only one end along the length of the aerosol-generating substrate 10.

[0062] 4 to 13, the aerosol-generating substrate 10 is cylindrical, i.e., the cross-sectional outline of the aerosol-generating substrate 10 is approximately circular in a plane perpendicular to the longitudinal direction of the aerosol-generating substrate 10. The regularity of the outer shape of the cylindrical aerosol-generating substrate 10 reduces the difficulty of the manufacturing process. The arrangement of the airway holes 10a distributed non-uniformly on the aerosol-generating substrate 10 is not limited.

[0063] 4 to 17, all the airway holes 10a are distributed on multiple trajectories, where each airway hole 10a on a single trajectory line is linearly arranged along a first direction Z1, and multiple trajectories are arranged along a second direction Z2, where the first direction Z1 and the second direction Z2 are not parallel. The first direction Z1 and the second direction Z2 form a planar two-dimensional coordinate system, and the first direction Z1 and the second direction Z2 can define the arrangement of the airway holes 10a. In other words, the airway holes 10a have a specific arrangement rule, which makes it easy to process each airway hole 10a according to the predetermined arrangement rule during the molding process.

[0064] 4 to 13, the airway holes 10a on a single locus are arranged at equal intervals. Here, "equally spaced" refers to the equal distance between the centers of two adjacent airway holes 10a. This ensures that the shapes and sizes of the partitions between two adjacent airway holes 10a are approximately the same. This improves the uniformity of the aerosol emitted by the aerosol-generating substrate 10 during the heated inhalation process, which is beneficial for the uniformity of aerosol transmission and heat reception, thereby improving the user's inhalation experience. In other words, the aerosol-generating substrate in the embodiments of the present application can improve the user's inhalation experience.

[0065] The first direction Z1 may be a straight line or a curved line, and the second direction Z2 may be a straight line or a curved line.

[0066] In one embodiment, each airway hole 10a on a single trajectory line can also be arranged linearly along a first direction Z1, and multiple trajectory lines can be arranged along a second direction Z2 perpendicular to the first direction Z1, i.e., multiple airway holes 10a can be arranged in a matrix as shown in Figures 14 and 15.

[0067] In one embodiment, the airway holes 10a on a single trajectory line are arranged in an overlapping arrangement with equal intervals, i.e., the airways in the same row are completely identical, i.e., the airway holes 10a in each row are arranged in an overlapping arrangement with equal intervals. Note that there are multiple ways in which the airway holes 10a on a single trajectory line can be arranged in an overlapping arrangement with equal intervals. For example, in some embodiments, the airway holes 10a on a single trajectory line are arranged in an overlapping arrangement with equal intervals along a straight line. In other embodiments, the airway holes 10a on a single trajectory line are arranged in a circumferential direction around the center of the aerosol-generating substrate 10.

[0068] In other embodiments, the airway holes 10a in a single trajectory line may be unevenly spaced, and each airway in the same row of airways may be different.

[0069] For example, referring to Figures 1 to 13, each airway hole 10a on a single trajectory line is arranged along a circumferential direction surrounding the center of the aerosol-generating substrate 10, and multiple trajectory lines are arranged non-uniformly along the radial direction of the aerosol-generating substrate 10.

[0070] The circumferential direction surrounding the center of the aerosol-generating substrate 10 corresponds to the first direction Z1, and the radial direction of the aerosol-generating substrate 10 corresponds to the second direction Z2; that is, the multiple airway holes 10a can be arranged in a ring shape.

[0071] It can be understood that the airways in the multiple rows of airways are unevenly distributed, and the unevenly distributed airways can be combined with different heating methods to achieve uniform heating of the aerosol-generating substrate 10 and consistency of the aerosol inhaled back and forth.

[0072] In one embodiment, the airway holes 10a on a single trajectory line are arranged in an overlapping arrangement, where overlapping arrangement refers to the airway holes 10a in the same row being completely identical. The diameter of the airway holes 10a on each trajectory line gradually increases outward along the radial direction of the aerosol-generating substrate 10. That is, the diameters of the airway holes 10a on different trajectory lines are different, and the diameters of the airway holes 10a increase the farther from the center of the aerosol-generating substrate 10. For example, referring to FIG. 4 , taking a plurality of trajectory lines arranged in a circular pattern as an example, the diameters of the airway holes 10a on each trajectory line may gradually increase from the airway hole 10a on the first trajectory line, which is close to the center of the aerosol-generating substrate 10, to the airway hole 10a on the last trajectory line, which is farther from the center of the aerosol-generating substrate 10. Of course, in other embodiments, the airway holes 10a may be arranged in a matrix, and the diameter of the airway holes 10a on each trajectory line may gradually increase radially outward on the aerosol-generating substrate 10. In one embodiment, the airway holes 10a on a single trajectory line may be arranged in an overlapping arrangement, and the wall thickness of the partition between the airway holes 10a on adjacent two trajectory lines may gradually decrease radially outward on the aerosol-generating substrate 10. That is, the multiple trajectory lines are not arranged at equal intervals, and the wall thickness of the partition between the adjacent two trajectory lines may become thinner as the distance from the center of the aerosol-generating substrate 10 increases. For example, referring to FIG. 8 , taking multiple trajectory lines arranged in a circular pattern as an example, the wall thickness of the partition between the airway holes 10a on adjacent two trajectory lines may gradually decrease from the airway hole 10a on the first trajectory line, which is close to the center of the aerosol-generating substrate 10, to the airway hole 10a on the last trajectory line, which is farther from the center of the aerosol-generating substrate 10. Of course, in other embodiments, each airway hole 10a can be arranged in a matrix, with the wall thickness of the partition between two adjacent airway holes 10a on a trajectory line becoming thinner as it moves radially outward along the aerosol-generating substrate 10.

[0073] In the aerosol-generating substrate 10, the pore size of the airway holes 10a increases the farther from the center of the aerosol-generating substrate 10, and in the aerosol-generating substrate 10, the wall thickness of the partition between two adjacent airway holes 10a on two trajectories decreases the farther from the center of the aerosol-generating substrate 10. In both cases, the mass per unit volume of the aerosol-generating substrate 10 increases the closer to the central region of the aerosol-generating substrate 10. When applied to a central heating method, it takes longer for heat to be conducted from the inside to the outside, which can delay the time it takes for the outer wall of the aerosol-generating substrate 10 to be heated (when a certain amount of heat is supplied to the aerosol-generating substrate 10, the larger the mass of the substrate, the longer it takes to heat up to a predetermined temperature). This improves the uniformity of the aerosol emitted by the aerosol-generating substrate 10, increases the inhalation time and number of inhalations, while maintaining consistency in aerosol emission, and provides the user with a comfortable inhalation experience.

[0074] 6, in some other embodiments, the airway holes 10a on a single trajectory line may be arranged in an overlapping arrangement, with the pore diameter of the outermost single trajectory line farther from the center of the aerosol-generating substrate 10 being larger than the pore diameter of the inner single trajectory line along the radial direction of the aerosol-generating substrate 10. In other words, the pore diameter of the airway holes 10a only on the outermost trajectory line is increased, i.e., the pore diameter of the airway holes 10a on the trajectory line farthest from the center of the aerosol-generating substrate 10 is increased, while the pore diameters of the airway holes 10a on the other trajectory lines except for the airway holes 10a on the outermost trajectory line are the same. When the aerosol-generating substrate 10 in this embodiment is applied to the central heating method, it takes a long time for heat to be conducted from the inside to the outside, and the time for the outer wall of the aerosol-generating substrate 10 to be heated can be delayed, thereby improving the uniformity of the aerosol emitted by the aerosol-generating substrate 10 and increasing the length of inhalation time and the number of inhalations, while maintaining the consistency of the aerosol emission, and providing the user with a comfortable inhalation experience.

[0075] In one embodiment, the airway holes 10a on a single trajectory line are arranged in an overlapping pattern, and the diameter of the airway holes 10a on each trajectory line may gradually decrease radially outward on the aerosol-generating substrate 10. That is, the diameters of the airway holes 10a on different trajectory lines may be different, and the diameters of the airway holes 10a may decrease further from the center of the aerosol-generating substrate 10. For example, referring to FIG. 5 , taking a plurality of trajectory lines arranged in a circular pattern as an example, the diameters of the airway holes 10a may gradually decrease from the airway holes 10a on the first trajectory line, which is closer to the center of the aerosol-generating substrate 10, to the airway holes 10a on the last trajectory line, which is further from the center of the aerosol-generating substrate 10. Of course, in other embodiments, the airway holes 10a may be arranged in a matrix pattern, and the diameters of the airway holes 10a on each trajectory line may gradually decrease radially outward on the aerosol-generating substrate 10.

[0076] In one embodiment, the airway holes 10a on a single trajectory line are arranged in an overlapping arrangement, and the wall thickness of the partition between the airway holes 10a on two adjacent trajectory lines may gradually increase radially outward on the aerosol-generating substrate 10. That is, the airway holes 10a on multiple trajectory lines are not arranged at equal intervals, and the wall thickness of the partition between the airway holes 10a on two adjacent trajectory lines increases with distance from the center of the aerosol-generating substrate 10. For example, referring to FIG. 7 , taking multiple trajectory lines arranged in a circular pattern as an example, the wall thickness of the partition between the airway holes 10a on two adjacent trajectory lines may gradually increase from the airway hole 10a on the first trajectory line, which is close to the center of the aerosol-generating substrate 10, to the airway hole 10a on the last trajectory line, which is farther from the center of the aerosol-generating substrate 10. Of course, in other embodiments, each airway hole 10a can be arranged in a matrix, with the wall thickness of the partition between two adjacent airway holes 10a on a trajectory line increasing radially outward along the aerosol-generating substrate 10.

[0077] In the aerosol-generating substrate 10, the pore size of the airway holes 10a decreases the farther away from the center of the aerosol-generating substrate 10, and the wall thickness of the partition between two adjacent airway holes 10a on the trajectory line increases the farther away from the center of the aerosol-generating substrate 10. In both cases, the mass per unit volume of the aerosol-generating substrate 10 increases the closer to the outer wall of the aerosol-generating substrate 10. When applied to a peripheral heating method, it takes longer for heat to be conducted from the outside to the inside, thereby delaying the heating time of the central position of the aerosol-generating substrate 10 and improving the uniformity of the aerosol emitted by the aerosol-generating substrate 10. This increases the length of time and the number of puffs, while maintaining the consistency of the aerosol emission, providing the user with a comfortable inhalation experience.

[0078] In some other embodiments, the airway holes 10a on a single trajectory line may be arranged in an overlapping arrangement, with the pore diameter of the innermost trajectory line closest to the center of the aerosol-generating substrate 10 being larger than the pore diameter of the outermost trajectory line in the radial direction of the aerosol-generating substrate 10. That is, the pore diameter of the airway holes 10a on only the innermost trajectory line is increased, i.e., the pore diameter of the airway holes 10a on the trajectory line closest to the center of the aerosol-generating substrate 10 is increased, while the pore diameters of the airway holes 10a on the other trajectories except for the innermost trajectory line are the same. When the aerosol-generating substrate 10 in this embodiment is heated from the outside to the inside, it takes a long time for heat to be transferred from the outside to the inside, which can delay the heating of the central position of the aerosol-generating substrate 10. This improves the uniformity of the aerosol emitted by the aerosol-generating substrate 10, increases the length of time and the number of puffs, while maintaining the consistency of the aerosol emission and providing a comfortable inhalation experience to the user.

[0079] The airway holes 10a may be arranged non-uniformly along the length of the aerosol-generating substrate 10. For example, referring to Figure 15, the diameter of each airway hole 10a gradually increases from the center to the opposite ends along the axial direction of the aerosol-generating substrate 10, i.e., along the length of the aerosol-generating substrate 10. That is, the diameter of each airway hole 10a is larger at both ends and smaller at the center.

[0080] In some other embodiments, the pore size of each airway hole 10a gradually decreases from the center to the opposite ends along the axial direction of the aerosol-generating substrate 10, i.e., along the length of the aerosol-generating substrate 10. That is, the pore size of each airway hole 10a is smaller at the ends and larger at the center.

[0081] 14, in still other embodiments, the pore size of each airway hole 10a gradually increases along the axial direction of the aerosol-generating substrate 10, i.e., along the length of the aerosol-generating substrate 10, from one end of the aerosol-generating substrate 10 to the opposite end thereof. That is, the pore size of the airway hole 10a is small at one end and large at the other end.

[0082] Along the axial direction of the aerosol-generating substrate 10, the pore diameter of each airway hole 10a gradually increases (see Figure 15) or gradually decreases from the center to the opposite ends, or the pore diameter of each airway hole 10a gradually increases from one end of the aerosol-generating substrate 10 to the opposite end, and each airway hole 10a is arranged unevenly along the length of the aerosol-generating substrate 10, i.e., each airway hole 10a is an airway hole 10a with a variable diameter along its extension direction. When applied to a bottom heating method, such as an air heating method, changing the pore size of the same airway hole 10a when hot air flows in from the bottom of the aerosol-generating substrate 10 can change the fluid flow rate at different positions of the same airway hole 10a, thereby improving the aerosol extraction efficiency at a specific position (diameter change position). Furthermore, the airway hole 10a has a variable diameter along its extension direction, which can straighten the aerosol, i.e., increase the aerosol flow rate at the diameter change position, compress the aerosol before releasing it, mix the aerosol uniformly, maintain the uniformity and consistency of the aerosol, and provide the user with a comfortable inhalation experience.

[0083] The uneven distribution of the airway holes 10a along multiple trajectories is not limited to the above-described embodiment, and various adjustments can be made as needed. For example, the spacing between the airway holes 10a along a single trajectory line can be changed, the cross-sectional shapes of the airway holes 10a in different rows can be changed, and the above-described embodiments of varying hole diameters, varying the wall thickness of the partitions between adjacent airway holes 10a, and varying the diameter of the airway holes 10a along the extension direction of the airway holes 10a can be combined.

[0084] In some embodiments, the plurality of airway pores 10a within the aerosol-generating substrate 10 may be randomly distributed. Here, the cross-sectional shapes of each of the randomly distributed plurality of airway pores 10a may be identical, or at least two of the airway pores 10a may have different cross-sectional shapes. Similarly, the pore diameters of each of the airway pores 10a may be identical, or at least two of the airway pores 10a may have different pore diameters.

[0085] Furthermore, for an aerosol-generating substrate 10 having multiple airway holes 10a provided therein, whether a method of providing multiple trajectory lines or a method of random distribution is adopted, in one embodiment, referring to Figures 4 to 15, each airway hole 10a can be distributed in each region inside the aerosol-generating substrate 10, that is, airways 10a are provided in almost all regions inside the aerosol-generating substrate 10, and there are no regions where airway holes 10a are clearly not provided (Figures 4 to 15 do not take into account small regions near the outer wall of the aerosol-generating substrate 10 where airway holes 10a are not provided).

[0086] 16 and 17, the aerosol-generating substrate 10 may have a first region 10b and a second region 10c, and all of the airway holes 10a may be located in the first region 10b. That is, the first region 10b may have only the airway holes 10a, and the second region 10c may have no airway holes 10a. The number and locations of the first region 10b and the second region 10c may be determined as needed and are not particularly limited herein.

[0087] By providing airway holes 10a only in the first region 10b and not in the second region 10c, the peripheral heating method can be used to maintain the aerosol release rate at the outer edge of the aerosol-generating substrate 10 while reducing the heating rate and aerosol release rate within the aerosol-generating substrate 10, thereby achieving stable aerosol release. This can meet some consumers' needs for multiple puffs from a single product (multiple puffs and long-term puffs) while extending the aerosol release time of the aerosol-generating substrate 10 and maintaining a consistent aerosol inhalation (the thinner the wall thickness between adjacent airway holes 10a, the faster the aerosol release rate; therefore, not providing airway holes 10a in the second region 10c can extend the usage time of the aerosol-generating substrate 10).

[0088] In one embodiment, referring to Figures 9 to 13, an airway groove 10d is formed in the outer wall of the aerosol-generating substrate 10, and the airway groove 10d penetrates at least one end along the length of the aerosol-generating substrate 10, i.e., a portion of the outer wall of the aerosol-generating substrate 10 is recessed to form the airway groove 10d, which corresponds to the groove-shaped airway groove 10d being visible from the outer wall of the aerosol-generating substrate 10.

[0089] The phrase "the airway groove 10b penetrates at least one end along the length of the aerosol-generating substrate 10" means that the airway groove 10b may penetrate both opposite ends along the length of the aerosol-generating substrate 10, or one end of the airway groove 10b may penetrate an end face along the length of the aerosol-generating substrate 10 and the other end of the airway groove 10b may be blind. It can be understood that, compared with the case where the airway hole 10a penetrates only one end along the length of the aerosol-generating substrate 10, the case where the airway hole 10a penetrates both ends along the length of the aerosol-generating substrate 10 is advantageous in reducing the inhalation resistance of the user.

[0090] The outer coating layer 30 on the periphery of the aerosol-generating substrate 10 can seal the airway grooves 10d on the periphery of the aerosol-generating substrate 10, allowing the airway grooves 10d to function as aerosol airflow passages, thereby improving the air inflow rate and aerosol extraction efficiency. In addition, when the heating assembly uses ambient heating, this heating method can also adjust the overall heating rate of the aerosol-generating substrate 10, improving the user's inhalation experience.

[0091] Here, the number of airway grooves 10d is not limited here, but for example, the number of airway grooves 10d may be one or more.

[0092] The shape of the aerosol-generating substrate 10 is not limited herein, but examples of the cross-sectional shape of the aerosol-generating substrate 10 in a plane perpendicular to the longitudinal direction of the aerosol-generating substrate 10 include, but are not limited to, a circle, an ellipse, a track, or a polygon. In the examples of the present application, the cross-sectional shape of the aerosol-generating substrate 10 is described as being circular, i.e., the aerosol-generating substrate 10 is described as being cylindrical.

[0093] Here, the cross-sectional shape of the aerosol-generating substrate 10 refers to the cross-sectional shape of the aerosol-generating substrate 10 cut along a plane perpendicular to the longitudinal direction of the aerosol-generating substrate 10 .

[0094] Here, the track shape refers to a shape similar to a running track, and is formed by two semicircles and two parallel straight lines connected alternately.

[0095] Although the shape of the airway hole 10a is not limited herein, for example, in a plane perpendicular to the longitudinal direction of the aerosol-generating substrate 10, the cross-sectional shape of the airway hole 10a includes, but is not limited to, a circle, an ellipse, a track, a sector or a polygon, where the polygon includes a regular polygon or an irregular polygon.

[0096] Here, the cross-sectional shape of the airway opening 10a refers to the cross-sectional shape of the airway opening 10a cut along a plane perpendicular to the longitudinal direction of the aerosol-generating substrate 10.

[0097] Although the shape of the airway groove 10d is not limited herein, for example, in one embodiment, in a plane perpendicular to the longitudinal direction of the aerosol-generating substrate 10, the cross-sectional shape of the airway groove 10d includes, but is not limited to, a semicircular, arc-shaped, V-shaped, rectangular or trapezoidal shape.

[0098] In some other embodiments, the cross-sectional shape of the airway groove 10d in a plane perpendicular to the longitudinal direction of the aerosol-generating substrate 10 is the same as the local shape of the airway hole 10a, i.e., the cross-sectional shape of the airway groove 10d is the same as the local shape of the airway hole 10a, for example, the cross-sectional shape of the airway hole 10a is circular and the cross-sectional shape of the airway groove 10d is semicircular. During the molding process, the airway groove 10d can be molded using the same mold as the airway hole 10a, which simplifies the mold design, reduces mold costs, and reduces production costs.

[0099] Furthermore, the cross-sectional shape of each airway hole 10a may be completely identical, or at least two of the airway holes 10a may have different cross-sectional shapes, for example, at least one airway hole 10a may have a circular cross-sectional shape and at least one airway hole 10a may have a polygonal cross-sectional shape.

[0100] When multiple airway grooves 10d are provided on the outer wall of the aerosol-generating substrate 10, the cross-sectional shape of each airway groove 10d may be completely identical, or at least two of the airway grooves 10d may have different cross-sectional shapes, for example, at least one airway groove 10d may have a semicircular cross-sectional shape and at least one airway groove 10d may have a polygonal cross-sectional shape.

[0101] By providing airway holes 10a inside the aerosol-generating substrate 10, the internal surface area of ​​the aerosol-generating substrate 10 can be increased and heating efficiency can be improved. At the same time, the aerosol can flow out through the gaps or pores in the partitions between each airway hole 10a, be collected in the evenly distributed airway holes 10a, and be transported to the suction end by the action of negative suction pressure. The even distribution of the airway holes 10a is beneficial to the uniformity of aerosol transmission and uniformity of heat reception, and has the effect of improving the user's inhalation experience.

[0102] The provision of the airway grooves 10d on the outer wall of the aerosol-generating substrate 10 increases the external surface area of ​​the aerosol-generating substrate 10, improving heating efficiency and enhancing the user's inhalation experience, while also benefiting the extraction of active ingredients. Furthermore, when the heating assembly uses ambient heating, this heating method can also be used to adjust the overall heating rate of the aerosol-generating substrate 10, thereby further improving the user's experience. At the same time, the aerosol can flow out of the gaps or pores in the aerosol-generating substrate 10, be collected in the airway grooves 10d, and be transported to the suction end by the action of negative suction pressure. The provision of the airway grooves 10d is beneficial to the transmission of the aerosol, further improving the user's experience.

[0103] By providing airway holes 10a inside the aerosol-generating substrate 10 and airway grooves 10d on the outer wall of the aerosol-generating substrate 10, the inner and outer surface areas of the aerosol-generating substrate 10 can be increased simultaneously, and better effects can be achieved compared to when airway holes 10a are provided only inside the aerosol-generating substrate 10.

[0104] In one embodiment, referring to Figures 4 to 8, the center line along the extension direction of at least one of the multiple airway holes 10a overlaps with the central axis along the length direction of the aerosol-generating substrate 10, i.e., the airway hole 10a is located at the center of the aerosol-generating substrate 10.

[0105] The central axis along the length of the aerosol-generating substrate 10 is an imaginary reference line.

[0106] Here, overlapping means that the center line along the extension direction of the airway hole 10a and the central axis along the length direction of the aerosol-generating substrate 10 almost overlap; in other words, there may be a certain gap between the center line along the extension direction of the airway hole 10a and the central axis along the length direction of the aerosol-generating substrate 10, and the central axis along the length direction of the aerosol-generating substrate 10 almost passes through the central airway hole 10a.

[0107] The airway hole 10a located on the central axis collects aerosol at the medium outlet during the heating and inhalation process (due to the fast flow rate at the medium central hole, a negative pressure area is formed at the outlet of the medium central hole, which collects the aerosol flowing out from the outer peripheral holes), thereby improving the ``collection'' of the aerosol, and further improving the temperature stability of the aerosol at the medium outlet (due to the fast aerosol flow rate at the central hole and small temperature change of the aerosol, the rate of temperature change after collection can be reduced), further improving the consumer's inhalation experience.

[0108] It should be noted that the airway hole 10a in the embodiments of the present application may be a linear hole, i.e., the airway hole 10a extends along a straight line, or the airway hole 10a may be a curved hole, for example, extending in a spiral shape.

[0109] For example, the hydraulic diameter of the airway hole 10a is 0.05 mm to 6 mm (millimeters), such as 0.05 mm, 0.1 mm, 0.2 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.3 mm, 1.6 mm, 1.8 mm, 2 mm, 2.1 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 4 mm, 5 mm, 6 mm, etc.

[0110] In the examples of this application, hydraulic diameter refers to the ratio of four times the cross-sectional area of ​​the flow channel to the perimeter.

[0111] If the hydraulic diameter of the airway holes 10a exceeds 6 mm, the number of airway holes 10a will be reduced, making it easier for the aerosol-generating substrate 10 to burn, and the aerosol-generating substrate 10 is more likely to emit uneven aerosol during the heating process (for example, a large amount of aerosol is emitted during the first two puffs and a small amount during the subsequent puffs), which will affect the user's smoking experience.

[0112] If the hydraulic diameter of the airway hole 10a is less than 0.05 mm, the molding process becomes significantly more difficult, it becomes difficult to control the size of the airway hole 10a, and the reject rate of the aerosol-generating substrate 10 increases.

[0113] When the hydraulic diameter of the airway hole 10a is within the range of 0.05 mm to 6 mm, the flow resistance of the aerosol-generating substrate 10 is relatively small (i.e., the suction resistance is relatively small), and the aerosol flow rate is appropriate, the aerosol inside the aerosol-generating substrate 10 is easily extracted, the aerosol is released uniformly and the utilization rate is high, the aerosol is less likely to burn on the aerosol-generating substrate 10, the user experience is relatively good, and processing and manufacturing are convenient.

[0114] Preferably, the hydraulic diameter of the airway hole 10a is 0.1 mm to 3 mm (millimeters), for example, 0.1 mm, 0.2 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.3 mm, 1.6 mm, 1.8 mm, 2 mm, 2.1 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, etc. Illustratively, the cross-sectional area of ​​the airway hole 10a is 0.0019 mm 2 ~30mm 2 (square millimeters). For example, 0.002 mm 2 , 0.1mm 2 , 0.2mm 2 , 0.4mm 2 , 0.5mm 2 , 0.8mm 2 , 1mm 2 , 1.3mm 2 , 1.6mm 2 , 1.8mm 2 , 2mm 2 , 2.1mm2 , 2.2mm 2 , 2.4mm 2 , 2.6mm 2 , 2.8mm 2 , 3mm 2 , 4mm 2 , 5mm 2 , 6mm 2 And so on.

[0115] In the examples of this application, cross-sectional area refers to the cross-sectional area of ​​the flow path.

[0116] The cross-sectional area of ​​the airway hole 10a is 30 mm 2 If the heating temperature exceeds this value, the number of airway holes 10a will be reduced, the aerosol-generating substrate 10 will be more likely to burn, and the aerosol-generating substrate 10 will be more likely to emit uneven aerosol during the heating process (for example, the amount of aerosol emitted will be large during the first two puffs and small during the subsequent puffs), which will affect the user's smoking experience.

[0117] The cross-sectional area of ​​the airway hole 10a is 0.0019 mm 2 If the thickness is less than this, the molding process becomes significantly more difficult, it becomes difficult to control the size of the airway hole 10a, and the reject rate of the aerosol-generating substrate 10 increases.

[0118] The cross-sectional area of ​​the airway hole 10a is 0.0019 mm 2 ~30mm 2 Within this range, the flow resistance of the aerosol-generating substrate 10 is relatively small (i.e., the suction resistance is relatively small), and the aerosol flow rate is appropriate, making it easy to extract the aerosol inside the aerosol-generating substrate 10, resulting in uniform aerosol release and high utilization rate, and the aerosol-generating substrate 10 being less likely to burn, resulting in a relatively high user experience and convenience in processing and manufacturing.

[0119] Preferably, the cross-sectional area of ​​the airway hole 10a is 0.007 mm 2 ~7.1mm 2 (square millimeters). For example, 0.1 mm 2 , 0.2mm2 , 0.4mm 2 , 0.5mm 2 , 0.8mm 2 , 1mm 2 , 1.3mm 2 , 1.6mm 2 , 1.8mm 2 , 2mm 2 , 2.1mm 2 , 2.2mm 2 , 2.4mm 2 , 2.6mm 2 , 2.8mm 2 , 3mm 2 And so on.

[0120] In the description of the present application, a statement referring to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," or "exemplary" means that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In the present application, general expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art can combine different embodiments or examples described in the present application, and features of different embodiments or examples, unless they are mutually inconsistent.

[0121] The above is only a preferred embodiment of the present application, and does not limit the present application, and those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should all be included in the protection scope of the present application.

Claims

1. An aerosol-generating substrate having a plurality of airway holes therein, each of which penetrates at least one end of the aerosol-generating substrate along its length, and each of which is formed in the aerosol-generating substrate in a non-uniformly distributed manner.

2. each of the airway holes penetrates each of the opposite ends of the aerosol-generating substrate in the longitudinal direction, and the aerosol-generating substrate has a circular cross-sectional shape in a plane perpendicular to the longitudinal direction of the aerosol-generating substrate; 2. The aerosol-generating substrate of claim 1.

3. All the airway holes are distributed on a plurality of locus lines, and each of the airway holes on a single locus line is linearly arranged along a first direction, and the plurality of locus lines are arranged along a second direction, and the first direction and the second direction are not parallel to each other.

2. The aerosol-generating substrate of claim 1.

4. the airway holes on a single locus line are arranged in a circumferential direction surrounding the center of the aerosol-generating substrate, and the multiple locus lines are unevenly arranged along a radial direction of the aerosol-generating substrate.

4. The aerosol-generating substrate of claim 3.

5. the airway holes on each single locus line are arranged in an overlapping arrangement, and along the radial direction of the aerosol-generating substrate, the hole diameter of the airway hole on the outermost single locus line away from the center of the aerosol-generating substrate is larger than the hole diameter of the airway hole on the innermost single locus line, or the hole diameter of the airway hole on the innermost single locus line close to the center of the aerosol-generating substrate is larger than the hole diameter of the airway hole on the outermost single locus line; 4. The aerosol-generating substrate of claim 3.

6. the airway holes on each single locus line are arranged in an overlapping arrangement, and the pore diameters of the airway holes on each locus line gradually increase or decrease outward along the radial direction of the aerosol-generating substrate.

4. The aerosol-generating substrate of claim 3.

7. the airway holes on a single locus line are arranged in an overlapping arrangement, and the wall thickness of the partitions between the airway holes on two adjacent locus lines gradually increases or gradually decreases radially outward of the aerosol-generating substrate.

4. The aerosol-generating substrate of claim 3.

8. Each of the airway holes on a single locus line is arranged linearly along a first direction, and a plurality of locus lines are arranged parallel to a second direction, and the first direction and the second direction are perpendicular to each other.

4. The aerosol-generating substrate of claim 3.

9. the pore size of each of the airway holes gradually increases or decreases from the center to the opposite ends along the axial direction of the aerosol-generating substrate, or the pore size of each of the airway holes gradually increases from one end to the opposite end of the aerosol-generating substrate.

2. The aerosol-generating substrate of claim 1.

10. The aerosol-generating substrate has a first region and a second region therein, and all of the airway pores are distributed within the first region.

2. The aerosol-generating substrate of claim 1.

11. In a plane perpendicular to the length of the aerosol-generating substrate, the aerosol-generating substrate has an elliptical, track-shaped or polygonal cross-sectional shape; and / or The cross-sectional shape of the airway hole is circular, elliptical, track-shaped, sector-shaped or polygonal; 2. The aerosol-generating substrate of claim 1.

12. an airway groove is formed in the outer wall of the aerosol-generating substrate, the airway groove penetrating at least one end of the aerosol-generating substrate along its length; 12. An aerosol-forming substrate according to any one of claims 1 to 11.

13. the cross-sectional shape of the airway groove in a plane perpendicular to the length of the aerosol-generating substrate is the same as the local shape of the airway stoma; or In a plane perpendicular to the length of the aerosol-generating substrate, the cross-sectional shape of the airway groove is arc-shaped, rectangular, or trapezoidal.

13. The aerosol-generating substrate of claim 12.

14. 1. An aerosol-generating product comprising: An aerosol-forming substrate according to any one of claims 1 to 13; a functional segment provided at one end of the aerosol-generating substrate along its length, the functional segment including at least a filter segment for filtering the aerosol; an outer coating layer that surrounds the functional segment and the circumferential exterior of the aerosol-generating substrate;

15. the functional segment further comprises a temperature-reducing segment, the temperature-reducing segment being positioned between the filter segment and the aerosol-generating substrate.

15. The aerosol-generating product of claim 14.

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