AEROSOL GENERATING SUBSTRATE AND AEROSOL GENERATING PRODUCT

Description

CROSS-REFERENCE TO PRIOR APPLICATION

This application is a continuation of International Patent Application No. PCT/CN2023/098860, filed on Jun. 7, 2023, which claims priority to Chinese Patent Application No. 202310079543.6, filed on Jan. 20, 2023. The entire disclosure of both applications is hereby incorporated by reference herein.

FIELD

This application relates to the technical field of aerosol generating products, and in particular, to an aerosol generating substrate and an aerosol generating product.

BACKGROUND

Aerosol generating products include aerosol generating products that form aerosols by burning and aerosol generating products that form aerosols by heat-not-burn. In a typical heat-not-burn cigarette product, it contains an aerosol generating substrate such as a tobacco raw material, a flavor raw material, and/or an atomizing agent that can volatilize to generate aerosols when heated. The aerosol generating substrate is heated by an external heat source to a sufficient degree to diffuse. The aerosol generating substrate does not burn. When loaded with a large dose of atomizing agent, the atomizing agent is released by high-temperature heating to form aerosols.

In the related art, when aerosol generating products are inhaled, the inhalation resistance is relatively high, and the difference in aerosol volume between puffs is significant.

SUMMARY

In an embodiment, the present invention provides an aerosol generating substrate, comprising: a plurality of airway holes on an inside of the aerosol generating substrate, wherein each airway hole of the plurality of airway holes extends through at least one end of the aerosol generating substrate along a length direction, and wherein the plurality of airway holes are formed in the aerosol generating substrate in a non-uniform distribution.

BRIEF DESCRIPTION OF THE DRAWINGS

Subject matter of the present disclosure will be described in even greater detail below based on the exemplary figures. All features described and/or illustrated herein can be used alone or combined in different combinations. The features and advantages of various embodiments will become apparent by reading the following detailed description with reference to the attached drawings, which illustrate the following:

FIG. 1 is a schematic structural diagram of a first type of aerosol generating product according to an embodiment of this application;

FIG. 2 is a sectional diagram of the aerosol generating product shown in FIG. 1;

FIG. 3 is a schematic structural diagram of a second type of aerosol generating product according to an embodiment of this application;

FIG. 4 is a schematic structural diagram of a first type of aerosol generating substrate according to an embodiment of this application;

FIG. 5 is a schematic structural diagram of a second type of aerosol generating substrate according to an embodiment of this application;

FIG. 6 is a schematic structural diagram of a third type of aerosol generating substrate according to an embodiment of this application;

FIG. 7 is a schematic structural diagram of a fourth type of aerosol generating substrate according to an embodiment of this application;

FIG. 8 is a schematic structural diagram of a fifth type of aerosol generating substrate according to an embodiment of this application;

FIG. 9 is a schematic structural diagram of a sixth type of aerosol generating substrate according to an embodiment of this application;

FIG. 10 is a schematic structural diagram of a seventh type of aerosol generating substrate according to an embodiment of this application;

FIG. 11 is a schematic structural diagram of an eighth type of aerosol generating substrate according to an embodiment of this application;

FIG. 12 is a schematic structural diagram of a ninth type of aerosol generating substrate according to an embodiment of this application;

FIG. 13 is a schematic structural diagram of a tenth type of aerosol generating substrate according to an embodiment of this application;

FIG. 14 is a sectional diagram of an eleventh type of aerosol generating substrate according to an embodiment of this application;

FIG. 15 is a sectional diagram of a twelfth type of aerosol generating substrate according to an embodiment of this application;

FIG. 16 is a schematic structural diagram of a thirteenth type of aerosol generating substrate according to an embodiment of this application;

FIG. 17 is a schematic structural diagram of a fourteenth type of aerosol generating substrate according to an embodiment of this application;

FIG. 18 is a sectional diagram of a fifteenth type of aerosol generating substrate according to an embodiment of this application;

FIG. 19 is a sectional diagram of a sixteenth type of aerosol generating substrate according to an embodiment of this application; and

FIG. 20 is a sectional diagram of a third type of aerosol generating product according to an embodiment of this application.

DETAILED DESCRIPTION

In an embodiment, the present invention provides an aerosol generating substrate and an aerosol generating product that can reduce the inhalation resistance and improve the inhalation uniformity of each puff.

In an embodiment, the present invention provides an aerosol generating substrate. The inside of the aerosol generating substrate is provided with multiple airway holes. Each airway hole extends through at least one end of the aerosol generating substrate along the length direction. The airway holes are formed in the aerosol generating substrate in a non-uniform distribution manner.

In an embodiment, each airway hole extends through the two opposite ends of the aerosol generating substrate along the length direction; and on a plane perpendicular to the length direction of the aerosol generating substrate, the shape of the cross section of the aerosol generating substrate is a circular shape.

In an embodiment, the airway holes are distributed on multiple trajectory lines. The airway holes on a single trajectory line are linearly arranged along a first direction Z1, the multiple trajectory lines are arranged along a second direction Z2, and the first direction Z1 and the second direction Z2 are not in parallel.

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

In an embodiment, the airway holes on a single trajectory line are repeatedly arranged, and along the radial direction of the aerosol generating substrate, the apertures of the airway holes on the outermost single trajectory line away from the center of the aerosol generating substrate are larger than the apertures of the airway holes on an inner single trajectory line, or the apertures of the airway holes on the innermost single trajectory line close to the center of the aerosol generating substrate are larger than the apertures of the airway holes on an outer single trajectory line.

In an embodiment, the airway holes on a single trajectory line are repeatedly arranged, and the apertures of the airway holes on each trajectory line gradually increase or gradually decrease radially outward along the aerosol generating substrate.

In an embodiment, the airway holes on a single trajectory line are repeatedly arranged, and the wall thicknesses of partition walls between the airway holes on two adjacent trajectory lines gradually increase or gradually decrease radially outward along the aerosol generating substrate.

In an embodiment, the airway holes on a single trajectory line are linearly arranged along the first direction Z1, the multiple trajectory lines are arranged in parallel along the second direction Z2, and the first direction Z1 is perpendicular to the second direction Z2.

In an embodiment, the aperture of the airway hole gradually increases or gradually decreases from a middle portion to the two opposite ends along the axial direction of the aerosol generating substrate; or, the aperture of the airway hole gradually increases from one end of the aerosol generating substrate to the other opposite end.

In an embodiment, the inside of the aerosol generating substrate is provided with a first region and a second region, and the airway holes are distributed in the first region.

In an embodiment, on a plane perpendicular to the length direction of the aerosol generating substrate, the shape of the cross section of the aerosol generating substrate is an elliptical shape, a runway shape, or a polygonal shape.

In an embodiment, the shape of the cross section of the airway hole is a circular shape, an elliptical shape, a runway shape, a sector shape, or a polygonal shape.

In an embodiment, an airway groove is formed in the outer sidewall of the aerosol generating substrate, and the airway groove extends through at least one end of the aerosol generating substrate along the length direction.

In an embodiment, on the plane perpendicular to the length direction of the aerosol generating substrate, the shape of the cross section of the airway groove is the same as the local shape of the airway hole.

In an embodiment, on the plane perpendicular to the length direction of the aerosol generating substrate, the shape of the cross section of the airway groove is an arc shape, a rectangular shape, or a trapezoidal shape.

In an embodiment, the functional section further includes a cooling section, and the cooling section is located between the filtering section and the aerosol generating substrate.

An embodiment of this application further provides an aerosol generating product, which includes: the aerosol generating substrate described above;

• • a functional section, arranged at one end of the aerosol generating substrate along the length direction and includes a filtering section for filtering an aerosol; and
  • an outer wrapping layer, configured to wrap a circumferential outside of the functional section and the aerosol generating substrate.

The embodiments of this application provide the aerosol generating substrate and the aerosol generating product. The inside of the aerosol generating substrate is provided with multiple airway holes. Each airway hole extends through at least one end of the aerosol generating substrate along the length direction. The airway holes are formed in the aerosol generating substrate in a non-uniform distribution manner. When heating and atomizing the aerosol generating substrate, aerosols are released by heating the aerosol generating substrate. The aerosols flow out through gaps or micropores in the partition walls between the airway holes, are collected in the airway holes, and are conveyed to an inhalation end under the action of negative inhalation pressure. That is to say, by providing the multiple airway holes, the surface area of the aerosol generating substrate can be increased (the sidewall of the airway hole is equivalent to a part of the surface of the aerosol generating substrate), so that the heat of the aerosol generating substrate can enter the inside of the aerosol generating substrate from the outer surface of the aerosol generating substrate. Compared with the structure that the heat is directly transferred inside the aerosol generating substrate in the related technologies, the heating efficiency can be improved. In addition, in combination with different heating methods, the airway holes are formed in the aerosol generating substrate in a non-uniform distribution manner. That is to say, according to different heating methods, the mass per unit volume of the aerosol generating substrate in different regions can be adjusted by adjusting the aperture of the airway hole, the wall thickness of the partition wall between adjacent airway holes, and the like, thus achieving uniform heating of the aerosol generating substrate, maintaining the consistency of aerosol release, i.e., the consistency of the aerosols inhaled at the first few puffs and the last few puffs, and improving the user experience during inhaling. That is to say, the aerosol generating substrate provided in the embodiment of this application can improve the user experience.

It should be noted that without causing any conflict, the embodiments of this application and the technical features in the embodiments may be combined with each other, and the detailed description in the specific embodiments should be understood as an explanation of the purpose of this application and should not be regarded as an undue limitation on this application.

An embodiment of this application provides an aerosol generating product. Referring to FIG. 1 to FIG. 3. The aerosol generating product 100 includes a functional section 20, an outer wrapping layer 30, and an aerosol generating substrate 10. The functional section 20 is arranged at one end of the aerosol generating substrate 10 along the length direction. The functional section 20 at least includes a filtering section for filtering aerosols. The filtering section may also be referred to as a filter.

The outer wrapping layer 30 is configured to wrap the peripheral sides of the functional section 20 and the aerosol generating substrate 10.

The aerosol generating product 100 is used in conjunction with an electronic atomization device with a heating component. Specifically, the heating component heats and atomizes the aerosol generating substrate 10 to produce aerosols, and the user inhales the filtered aerosols through the filtering section of the functional section 20.

It should be noted that the aerosol generating product 100 generates aerosols by virtue of the aerosol generating substrate 10, while the functional section 20 does not generate aerosols.

It should be noted that the aerosol generating product in the embodiment of this application is applicable to inhalation by means of heating and burning, and is also applicable to inhalation by means of heating-not-burning. In the embodiment of this application, description is made by taking the aerosol generating product 100 being applicable to inhalation by means of heating-not-burning as an example.

There are various heating methods for the heating component. Exemplarily, the heating methods include central heating, circumferential heating, bottom air heating, and the like. The central heating method refers to baking and heating the aerosol generating product 100 from the inside to the outside through the heating component inserted into the aerosol generating product 100. The circumferential heating method refers to baking and heating the aerosol generating product 100 from the outside to the inside through the heating component arranged on the periphery of the aerosol generating product 100. The bottom heating method refers to first heating the air by using the heating component, and then baking and heating the aerosol generating product 100 from the bottom to the top through the hot air. These heating methods may specifically include resistance heating, electromagnetic heating, infrared heating, microwave heating, laser heating, and the like, which will not specifically limited here.

The functional section 20 may be provided with only a filtering section 21 as shown in FIG. 2, or may be provided with a filtering section 21 and a cooling section 22 as shown in FIG. 20. For the functional section 20 provided with the cooling section 22, the cooling section 22 is provided between the filtering section 21 and a vapor generating substrate structure 10 to cool the aerosols before the filtering section 21 filters the aerosols.

The cooling section is used for cooling the aerosols before the filtering section filters the aerosols, so as to reduce the temperature of the aerosols and improve the situation that “the mouth feels hot” when the user inhales the aerosols.

In some embodiments, the functional section 20 may be further provided with a supporting section. The supporting section has certain structural strength and plays a role of axially limiting the aerosol generating substrate 10. Specifically, when the aerosol generating product 100 is inserted into a heating chamber of an electronic atomization device, or when a heating element is inserted into the aerosol generating substrate 10, the supporting section provides a reaction force to the aerosol generating substrate 10, so as to prevent the aerosol generating substrate 10 from moving axially.

Another embodiment of this application provides an aerosol generating substrate. The aerosol generating substrate 10 is used for the aerosol generating product described in the embodiment of this application. Referring to FIG. 4 to FIG. 17, the inside of the aerosol generating substrate 10 is provided with multiple airway holes 10a. Each airway hole 10a extends through at least one end of the aerosol generating substrate 10 along the length direction, that is, the airway hole 10a extends along 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-uniform distribution manner.

It should be noted that the airway holes 10a being in “non-uniform distribution” refers to that the arrangement of the airway holes 10a is non-uniform, including matrix or concentric distribution of the airway holes 10a. The hole walls of the airway holes 10a form the surface of the aerosol generating substrate 10. The airway holes 10a can increase the surface area of the aerosol generating substrate 10, thus facilitating the heat transfer and improving the heating efficiency. In addition, the aerosols flow out through micropores, are collected into the airway holes 10a, and are conveyed to an inhalation end under the action of negative inhalation pressure, thus reducing the inhalation resistance when the user inhales the aerosols and improving the user experience.

Exemplarily, the aerosol generating substrate 10 is a granular combination, and is a recombinant tobacco substrate, such as a recombinant tobacco substrate containing components such as a vapor generating agent and tobacco. The aerosol generating substrate 10 is of an integral structure, for example, it may be an integral structure formed through a process such as injection molding, compression molding or extrusion molding. Extrusion molding refers to a process method in which a mixture of raw materials is added to an extruder, and the material is heated and plasticized while being pushed forward by a screw through the action between an extruder barrel and the screw, and continuously passes through a machine head to produce products or semi-finished products with various cross sections. The aerosol substrate formed by extrusion molding is strip-shaped. Since the aerosol generating substrate 10 is of an integral structure, when the aerosol generating substrate 10 is heated for inhaling or heating is stopped, it is an integral substrate without the problem of disintegration and falling, thus solving the problems that the filamentary or granular aerosol generating substrate 10 falls apart and is difficult to clean in the prior art.

In addition, micropores are formed between granules of the granular combination, and the micropores are communicated to form micro airways communicated with the airway holes 10a. The airway holes 10a extend through the two ends of the substrate, playing a role of uniformly introducing air and collectively conveying the aerosols. The recombinant tobacco substrate containing components such as a vapor generating agent and tobacco releases aerosols when heated. The aerosols are collected into the airway holes 10a through gaps or micropores between wall materials and conveyed to the inhalation end under the action of negative inhalation pressure.

It should be noted that the airway holes 10a may be non-uniformly distributed in the aerosol generating substrate 10 in various ways, for example, the airway holes may be non-uniformly arranged along the radial direction of the aerosol generating substrate 10, or non-uniformly arranged along the length direction of the aerosol generating substrate 10.

The airway holes 10a are non-uniformly distributed in the aerosol generating substrate 10. For example, the mass per unit volume of the aerosol generating substrate 10 may gradually decrease as it gets away from a heat source, that is, the closer to the heat source, the larger the mass per unit volume of the aerosol generating substrate 10 (the higher the density of the vapor generating substrate), and the farther away from the heat source, the smaller the mass per unit volume of the aerosol generating substrate 10 (the lower the density of the vapor generating substrate), thus prolonging the heating time of the aerosol generating substrate 10 away from the heat source, improving the uniformity of aerosols released from the aerosol generating substrate 10, increasing the inhaling duration or the number of puffs, and improving the user experience.

Providing the airway holes 10a inside the aerosol generating substrate 10 can increase the surface area of the aerosol generating substrate 10, improve the heating efficiency, and improve the user experience during inhaling.

The inside of the aerosol generating substrate provided in the embodiment of this application is provided with multiple airway holes 10a. Each airway hole 10a extends through at least one end of the aerosol generating substrate 10 along the length direction. The airway holes 10a are formed in the aerosol generating substrate 10 in a non-uniform distribution manner. When heating and atomizing the aerosol generating substrate 10, aerosols are released by heating the aerosol generating substrate 10. The aerosols flow out through gaps or micropores in the partition walls between the airway holes 10a, are collected in the airway holes 10a, and are conveyed to the inhalation end under the action of negative inhalation pressure. That is to say, by providing the multiple airway holes 10a, the surface area of the aerosol generating substrate 10 can be increased (the sidewall of the airway hole 10a is equivalent to a part of the surface of the aerosol generating substrate 10), so that the heat of the aerosol generating substrate 10 can enter the inside of the aerosol generating substrate 10 from the surface of the aerosol generating substrate 10. Compared with the structure that the heat is directly transferred inside the aerosol generating substrate 10 in the related technologies, the heating efficiency can be improved. In addition, in combination with different heating methods, the airway holes 10a are non-uniformly distributed in the aerosol generating substrate 10. That is to say, according to different heating methods, the mass per unit volume of the aerosol generating substrate 10 in different regions can be adjusted by adjusting the aperture of the airway hole 10a, the wall thickness of the partition wall between adjacent airway holes 10a, and the like, thus achieving uniform heating of the aerosol generating substrate 10, maintaining the consistency of aerosol release, i.e., the consistency of the aerosols inhaled at the first few puffs and the last few puffs, and improving the user experience during inhaling. That is to say, the aerosol generating substrate 10 provided in the embodiment of this application can improve the user experience.

The outer wrapping layer 30 is configured to wrap the circumferential outsides of the functional section 20 and the aerosol generating substrate 10.

The material of the outer wrapping layer 30 is not limited, for example, includes, but is not limited to, one or a combination of more of materials such as fiber paper, metal foil, metal foil composite fiber paper, polyethylene composite fiber paper, PE, and PBAT. In some embodiments, referring to FIG. 2, the functional section 20 only includes the filtering section 21. In some other embodiments, referring to FIG. 20, in addition to the filtering section 21, the functional section further includes the supporting section and/or the cooling section 22. The supporting section and/or the cooling section 22 are arranged between the aerosol generating substrate 10 and the filtering section 21.

The cooling section 22 is used for cooling the aerosols before the filtering section 21 filters the aerosols, so as to reduce the temperature of the aerosols and improve the situation that “the mouth feels hot” when the user inhales the aerosols.

The material of the cooling section 22 includes, but is not limited to, one or a combination of more of PE (polyethylene), PLA (polylactic acid, also known as polylactide), PBAT (butyleneadipate-co-terephthalate), PP (polypropylene), acetate fiber, and propylene fiber materials. The material of the filtering section includes, but is not limited to, one or a combination of more of PE (polyethylene), PLA (polylactic acid, also known as polylactide), PBAT (butyleneadipate-co-terephthalate), PP (polypropylene), acetate fiber, and propylene fiber materials.

The materials of the cooling section 22 and the filtering section may be the same or different.

The supporting section has certain structural strength and plays a role of axially limiting the aerosol generating substrate 10.

Specifically, when the aerosol generating product 100 is inserted into a heating chamber 200a of an aerosol generating device 200, or when a heating element is inserted into the aerosol generating substrate 10, the supporting section provides a reaction force to the aerosol generating substrate 10, so as to prevent the aerosol generating substrate 10 from moving axially.

The specific components of the aerosol generating substrate 10 are not limited here. Exemplarily, in an embodiment, the aerosol generating substrate 10 may include a plant component, an auxiliary component, a vapor generating agent component, a binder component, and the like.

In an embodiment, the plant component is one or a combination of more of powder formed by crushing tobacco raw materials, tobacco leaf fragments, tobacco stems, tobacco dust, fragrant plants, and the like. The plant component is the core source of the flavor of the product, and endogenous substances in the plant component, such as nicotine, enter the human bloodstream through atomization and promote the production of dopamine in the pituitary gland, thus obtaining physiological satisfaction.

In an embodiment, the auxiliary component may be one or a combination of more of an inorganic filler, a lubricant, and an emulsifier. The inorganic filler includes one or a combination of more of heavy calcium carbonate, light calcium carbonate, zeolite, attapulgite, talc powder, and diatomite. The inorganic filler can provide skeleton support for the plant component. At the same time, the inorganic filler also has micropores, which can increase the porosity of the wall material after the formation of the plant component, thus improving the aerosol release rate.

The lubricant includes one or a combination or more of candelilla wax, carnauba wax, shellac, sunflower wax, rice bran, beeswax, stearic acid, and palmitic acid. The lubricant can increase the fluidity of granules, reduce the friction between the granules, make the overall density of the granules more uniform, also reduce the pressure required for molding, and reduce the mold wear.

The emulsifier includes one or a combination of more of polyglycerol fatty acid esters, Tween-80, and polyvinyl alcohol. The emulsifier can to some extent slow down the loss of flavor substances during storage, increase the stability of the flavor substances, and improve the sensory quality of the product. The emulsifier (also known as surfactant) can reduce the interfacial tension between water-soluble and water-insoluble components in a mixed system, and form a stronger film on the surface of droplets or double electric layers on the surface of the droplets due to the electric charge given by the emulsifier, thus preventing the droplets from aggregating with each other and maintaining a uniform emulsion. Emulsifying and homogenizing two incompatible components can improve the consistency of product quality.

In an embodiment, the function of the vapor generating agent component is to generate a large amount of vapor when heated, thus increasing the vapor amount of the vapor generating product. The vapor generating agent may include, for example, one or a combination of more of monohydric alcohols (such as menthol); polyols (such as propylene glycol, triethylene glycol, 1,3-butanediol, and glycerol); esters of polyols (such as glyceryl monoacetate, glyceryl diacetate, or glyceryl triacetate); monocarboxylic acids; polycarboxylic acids (such as lauric acid and myristic acid) or aliphatic esters of polycarboxylic acids (such as dimethyl dodecanedioate, dimethyl tetradecanedioate, erythritol, 1,3-butanediol, tetracthylene glycol, triethyl citrate, propylene carbonate, ethyl laurate, triactin, meso-erythritol, glycerol diacetate mixture, diethyl octanoate, triethyl citrate, benzyl benzoate, benzyl phenylacetate, ethyl vanillate, glyceryl tributyrate, and lauryl acetate).

In an embodiment, the binder component is a natural plant extract and non-ionized modified viscous polysaccharide, including one or a combination of more of tamarind polysaccharide, pullulan polysaccharide, seaweed polysaccharide, locust bean gum, guar gum, and xyloglucan. The binder comes into close contact with an interface of the component materials of the product through wetting and generates intermolecular attraction, thus playing a role of bonding the powder, liquid and the like of the component materials. In addition, using the natural plant extracted and non-ionic modified binder can avoid the release of harmful substances such as methanol, formaldehyde, and acrolein caused by colloidal modification, and improve the safety of the product.

In some embodiments, referring to FIG. 18, the airway holes 10a extend through the same end of the aerosol generating substrate 10 along the length direction, and the other end is a closed end.

In some other embodiments, referring to FIG. 19, some of the airway holes 10a extend through one end of the aerosol generating substrate 10 along the length direction, while the other the airway holes 10a extend through the other end of the aerosol generating substrate 10 along the length direction.

In yet some other embodiments, referring to FIG. 4 to FIG. 13, each airway hole 10a extends through the two ends of the aerosol generating substrate 10 along the length direction. It can be understood that compared with the airway hole 10a extending through one end of the aerosol generating substrate 10 along the length direction, the airway hole 10a extending through the two ends of the aerosol generating substrate 10 along the length direction is more conducive to reducing the inhalation resistance when the user inhales the aerosols.

Exemplarily, referring to FIG. 4 to FIG. 13, the aerosol generating substrate 10 is cylindrical, that is, on a plane perpendicular to the length direction of the aerosol generating substrate 10, the cross-sectional profile of the aerosol generating substrate 10 is approximately circular. The cylindrical aerosol generating substrate 10 has a regular shape, thus reducing the difficulty of the manufacturing process. The arrangement of the airway holes 10a non-uniformly distributed in the aerosol generating substrate 10 is not limited.

Exemplarily, referring to FIG. 4 to FIG. 17, the airway holes 10a are distributed on multiple trajectory lines. The airway holes 10a on a single trajectory line are linearly arranged along a first direction Z1, the multiple trajectory lines are arranged along a second direction Z2, and the first direction Z1 and the second direction Z2 are not in parallel. The first direction Z1 and the second direction Z2 form a planar two-dimensional coordinate system, and the arrangement of the airway holes 10a can be defined by the first direction Z1 and the second direction Z2. That is to say, the airway holes 10a have a special arrangement pattern, thus facilitating the manufacturing of each airway hole 10a according to a predetermined arrangement pattern in the molding process.

Exemplarily, referring to FIG. 4 to FIG. 13, the airway holes 10a on a single trajectory line are equidistantly arranged. Equidistant arrangement refers to that the distances between the hole centers of every two adjacent airway holes 10a are equal. In this way, the shapes and sizes of partition walls between every two adjacent airway holes 10a are approximately and respectively the same. Therefore, in the heating and inhaling process, the uniformity of the aerosols released from the aerosol generating substrate 10 can be improved, the uniformity of aerosol transmission and heating is facilitated, and thus the user experience during inhaling can be improved. That is to say, the aerosol generating substrate 10 provided in the embodiment of this application can improve the user experience.

It should be noted that the first direction Z1 may be a straight line or a curve, and the second direction Z2 may be a straight line or a curve.

In an embodiment, the airway holes 10a on a single trajectory line may be linearly arranged along the first direction Z1, while the multiple trajectory lines may be arranged in the second direction Z2 perpendicular to the first direction Z1. That is to say, the multiple airway holes 10a may be arranged in a matrix shape as shown in FIG. 14 and FIG. 15.

In an embodiment, the airway holes 10a on a single trajectory line are equidistantly and repeatedly arranged, that is, the airway holes in the same row of airways are the same, that is to say, the airway holes 10a in each row of airway holes 10a among multiple rows are equidistantly and repeatedly arranged. It should be noted that there are various forms of equidistant and repeated arrangement for the airway holes 10a on a single trajectory line. For example, in some embodiments, the airway holes 10a on a single trajectory line are equidistantly and repeatedly arranged along a straight line. In some other embodiments, the airway holes 10a on a single trajectory line are arranged along a circumferential direction surrounding the center of the aerosol generating substrate 10.

In some other embodiments, the airway holes 10a on a single trajectory line may also be non-equidistantly arranged, and the airways in the same row may also be different.

Exemplarily, referring to FIG. 1 to FIG. 13, the airway holes 10a on a single trajectory line may be arranged along a circumferential direction surrounding the center of the aerosol generating substrate 10, and the multiple trajectory lines are non-uniformly arranged along the radial direction of the aerosol generating substrate 10.

The circumferential direction surrounding the center of the aerosol generating substrate 10 is equivalent to the first direction Z1, and the radial direction of the aerosol generating substrate 10 is equivalent to the second direction Z2, that is, the multiple airway holes 10a may be arranged in a ring shape.

It can be understood that the airways in multiple rows of airways may be non-uniformly distributed. The non-uniformly distributed airways, when combined with different heating methods, can achieve the uniform heating of the aerosol generating substrate 10 and the consistency of the aerosols inhaled at the first few puffs and the last few puffs.

In an embodiment, the airway holes 10a on a single trajectory line are repeatedly arranged. Repeated arrangement refers to that the airway holes 10a of the same row of airway holes 10a are the same. The apertures of the airway holes 10a on each trajectory line may gradually increase radially outward along the aerosol generating substrate 10, that is to say, the apertures of the airway holes 10a on different trajectory lines are different. The farther away from the center of the aerosol generating substrate 10, the larger the aperture of the airway hole 10a. Exemplarily, referring to FIG. 4, taking the multiple trajectory lines arranged in a ring shape as an example, the apertures of the airway holes 10a may gradually increase from the airway holes 10a on the first trajectory line close to the center of the aerosol generating substrate 10 to the airway holes 10a on the last trajectory line away from the center of the aerosol generating substrate 10. Of course, in other embodiments, the airway holes 10a may also be arranged in a matrix shape, and the apertures of the airway holes 10a on each trajectory line may gradually increase radially outward along the aerosol generating substrate 10. In an embodiment, the airway holes 10a on a single trajectory line are repeatedly arranged, and the wall thicknesses of the partition walls between the airway holes 10a on two adjacent trajectory lines may gradually decrease radially outward along the aerosol generating substrate 10. That is to say, the multiple trajectory lines are non-equidistantly arranged. The farther away from the center of the aerosol generating substrate 10, the smaller the wall thickness of the partition wall between two adjacent trajectory lines. Exemplarily, referring to FIG. 8, taking the multiple trajectory lines arranged in a ring shape as an example, the wall thicknesses of the partition walls between the airway holes 10a on two adjacent trajectory lines may gradually decrease from the airway holes 10a on the first trajectory line close to the center of the aerosol generating substrate 10 to the airway holes 10a on the last trajectory line away from the center of the aerosol generating substrate 10. Of course, in other embodiments, the airway holes 10a may also be arranged in a matrix shape, and the wall thicknesses of the partition walls between the airway holes 10a on two adjacent trajectory lines may gradually decrease radially outward along the aerosol generating substrate 10.

For both the aerosol generating substrate 10 where the farther away from the center of the aerosol generating substrate 10, the larger the aperture of the airway hole 10a, and the aerosol generating substrate 10 where the farther away from the center of the aerosol generating substrate 10, the smaller the wall thickness of the partition wall between the airway holes 10a on two adjacent trajectory lines, the closer to the center region of the aerosol generating substrate 10, the larger the mass per unit volume of the aerosol generating substrate 10. In the case of combining with the central heating method, the time required for heat to be transferred from the inside to the outside is longer, thus prolonging the time for the outer sidewall of the aerosol generating substrate 10 to be heated (when supplying certain amount of heat to the aerosol generating substrate 10, the larger the mass of the substrate, the longer the time required for heating to set temperature), improving the uniformity of the aerosols released from the aerosol generating substrate 10, increasing the inhaling duration and the number of puffs, maintaining the consistency of aerosol release, and providing a comfortable inhaling experience to the user.

In some other embodiments, referring to FIG. 6, the airway holes 10a on a single trajectory line may also be repeatedly arranged, and along the radial direction of the aerosol generating substrate 10, the aperture of the outermost single trajectory line away from the center of the aerosol generating substrate 10 is larger than the aperture of an inner single trajectory line. That is to say, only the apertures of the airway holes 10a on the outermost trajectory line increase, that is, the apertures of the airway holes 10a on the trajectory line farthest away from the center of the aerosol generating substrate 10 increase, and the apertures of the airway holes 10a on the other trajectory lines except for the airway holes 10a on the outermost trajectory line are the same. In a case that the aerosol generating substrate 10 in this embodiment is combined with the central heating method, the time required for heat to be transferred from the inside to the outside is longer, thus also prolonging the time for the outer sidewall of the aerosol generating substrate 10 to be heated, improving the uniformity of the aerosols released from the aerosol generating substrate 10, increasing the inhaling duration and the number of puffs, maintaining the consistency of aerosol release, and providing a comfortable inhaling experience to the user.

In an embodiment, the airway holes 10a on a single trajectory line are repeatedly arranged, and the apertures of the airway holes 10a on each trajectory line may gradually decrease radially outward along the aerosol generating substrate 10, that is to say, the apertures of the airway holes 10a on different trajectory lines are different. The farther away from the center of the aerosol generating substrate 10, the smaller the aperture of the airway hole 10a. Exemplarily, referring to FIG. 5, taking the multiple trajectory lines arranged in a ring shape as an example, the apertures of the airway holes 10a may gradually decrease from the airway holes 10a on the first trajectory line close to the center of the aerosol generating substrate 10 to the airway holes 10a on the last trajectory line away from the center of the aerosol generating substrate 10. Of course, in other embodiments, the airway holes 10a may also be arranged in a matrix shape, and the apertures of the airway holes 10a on each trajectory line may gradually decrease radially outward along the aerosol generating substrate 10.

In an embodiment, the airway holes 10a on a single trajectory line are repeatedly arranged, and the wall thicknesses of the partition walls between the airway holes 10a on two adjacent trajectory lines may gradually increase radially outward along the aerosol generating substrate 10. That is to say, the airway holes 10a on the multiple trajectory lines are non-equidistantly arranged. The farther away from the center of the aerosol generating substrate 10, the larger the wall thicknesses of the partition walls between the airway holes 10a on two adjacent trajectory lines. Exemplarily, referring to FIG. 7, taking the multiple trajectory lines arranged in a ring shape as an example, the wall thicknesses of the partition walls between the airway holes 10a on two adjacent trajectory lines may gradually increase from the airway holes 10a on the first trajectory line close to the center of the aerosol generating substrate 10 to the airway holes 10a on the last trajectory line away from the center of the aerosol generating substrate 10. Of course, in other embodiments, the airway holes 10a may also be arranged in a matrix shape, and the wall thicknesses of the partition walls between the airway holes 10a on two adjacent trajectory lines may gradually increase radially outward along the aerosol generating substrate 10.

For both the aerosol generating substrate 10 where the farther away from the center of the aerosol generating substrate 10, the smaller the aperture of the airway hole 10a, and the aerosol generating substrate 10 where the farther away from the center of the aerosol generating substrate 10, the larger the wall thickness of the partition wall between the airway holes 10a on two adjacent trajectory lines, the closer to the outer sidewall of the aerosol generating substrate 10, the larger the mass per unit volume of the aerosol generating substrate 10. In the case of combining with the circumferential heating method, the time required for heat to be transferred from the outside to the inside is longer, thus prolonging the time for the center of the aerosol generating substrate 10 to be heated, improving the uniformity of the aerosols released from the aerosol generating substrate 10, increasing the inhaling duration and the number of puffs, maintaining the consistency of aerosol release, and providing a comfortable inhaling experience to the user.

In some other embodiments, the airway holes 10a on a single trajectory line may also be repeatedly arranged, and along the radial direction of the aerosol generating substrate 10, the aperture of the innermost single trajectory line close to the center of the aerosol generating substrate 10 is larger than the aperture of an outer single trajectory line. That is to say, only the apertures of the airway holes 10a on the innermost trajectory line increase, that is, the apertures of the airway holes 10a on the trajectory line closest to the center of the aerosol generating substrate 10 increase, and the apertures of the airway holes 10a on the other trajectory lines except for the airway holes 10a on the innermost trajectory line are the same. In a case that the aerosol generating substrate 10 in this embodiment is combined with the circumferential heating method, the time required for heat to be transferred from the outside to the inside is longer, thus prolonging the time for the center of the aerosol generating substrate 10 to be heated, improving the uniformity of the aerosols released from the aerosol generating substrate 10, increasing the inhaling duration and the number of puffs, maintaining the consistency of aerosol release, and providing a comfortable inhaling experience to the user.

The airway holes 10a may also be non-uniformly arranged along the length direction of the aerosol generating substrate 10. Exemplarily, referring to FIG. 15, along the axial direction of the aerosol generating substrate 10, i.e., along the length direction of the aerosol generating substrate 10, the aperture of the airway hole 10a gradually increases from a middle portion to the two opposite ends. That is to say, the aperture of the airway hole 10a is larger at the two ends and smaller at the middle portion.

In some other embodiments, along the axial direction of the aerosol generating substrate 10, i.e., along the length direction of the aerosol generating substrate 10, the aperture of the airway hole 10a gradually decreases from the middle portion to the two opposite ends. That is to say, the aperture of the airway hole 10a is smaller at the two ends and larger at the middle portion.

In yet some other embodiments, referring to FIG. 14, along the axial direction of the aerosol generating substrate 10, i.e., along the length direction of the aerosol generating substrate 10, the aperture of the airway hole 10a gradually increases from one end of the aerosol generating substrate 10 to the other opposite end. That is to say, the aperture of the airway hole 10a is smaller at one end and larger at the other end.

Along the axial direction of the aerosol generating substrate 10, the aperture of the airway hole 10a gradually increases (referring to FIG. 15) or gradually decreases from the middle portion to the two opposite ends, or the aperture of the airway hole 10a gradually increases from one end of the aerosol generating substrate 10 to the other opposite end. The airway hole 10a is non-uniformly arranged along the length direction of the aerosol generating substrate 10, that is, the airway hole 10a is a variable-diameter airway hole 10a along the extension direction. In a case of combining with the bottom heating method, such as air heating method, when a hot airflow flows into the aerosol generating substrate 10 from the bottom, the fluid flow rate at different positions of the same airway hole 10a can be changed by changing the aperture of the same airway hole 10a, thus improving the aerosol extraction efficiency at specific positions (variable-diameter positions). In addition, the airway hole 10a is a variable-diameter airway hole 10a along the extension direction, thus achieving the rectification of the aerosols, that is, improving the aerosol flow rate at the variable-diameter position, making the aerosols mixed uniformly by releasing the aerosols after compression, maintaining the uniformity and consistency of the aerosols, and providing a comfortable inhaling experience to the user.

It should be noted that the non-uniform distribution of the airway holes 10a on the multiple trajectory lines is not limited to the embodiments described above. Various adjustments may be made as needed. For example, the spacing between the airway holes 10a on a single trajectory line may be changed, the shapes of the cross sections of the airway holes 10a in different rows may be changed, or the embodiment of changing aperture may be combined with the embodiment of changing wall thickness of the partition wall between adjacent airway holes 10a and the implement ion of designing the airway holes 10a to be variable-diameter airway holes 10a along the extension direction.

In some embodiments, the multiple airway holes 10a provided inside the aerosol generating substrate 10 may also be randomly distributed. Among the multiple airway holes 10a that are randomly distributed, the shapes of the cross sections of the airway holes 10a may be the same, or the shapes of the cross sections of at least two airway holes 10a may be different. Similarly, the apertures of the airway holes 10a may be the same, or the apertures of at least two airway holes 10a may be different.

In addition, for the aerosol generating substrate 10 provided with the multiple airway holes 10a inside, whether adopting the arrangement method of multiple trajectory lines or the arrangement method of random distribution, in an embodiment, referring to FIG. 4 to FIG. 15, the airway holes 10a may be distributed in various regions inside the aerosol generating substrate 10, that is to say, almost every region inside the aerosol generating substrate 10 is provided with the airway holes 10a, and there is no region without airway holes 10a (FIG. 4 to FIG. 15 do not consider a small circular region close to the outer sidewall of the aerosol generating substrate 10 where no airway holes 10a are provided).

In another embodiment, referring to FIG. 16 and FIG. 17, the inside of the aerosol generating substrate 10 is provided with a first region 10b and a second region 10c. The airway holes 10a may be distributed in the first region 10b, that is to say, the airway holes 10a may be provided only in the first region 10b, while no airway holes 10a are provided in the second region 10c. The number and location of the first region 10b and the second region 10c may be determined as needed, which are not limited here.

By providing the airway holes 10a only in the first region 10b and providing no airway holes 10a in the second region 10c, in the case of adopting the circumferential heating method, while maintaining the aerosol release rate on the outer edge of the aerosol generating substrate 10, the internal heating rate and aerosol release rate of the aerosol generating substrate 10 can be reduced, so that the aerosols can be stably released. This not only improves the aerosol release time and inhalation consistency of the aerosol generating substrate 10, but also meets the needs of some consumers for multiple puffs (multiple puffs and long-term inhalation) of one cigarette (the smaller the wall thickness of the partition wall between adjacent airway holes 10a, the faster the aerosol release rate; by providing no airway holes 10a in the second region 10c, the use time of the aerosol generating substrate 10 can be prolonged).

In an embodiment, referring to FIG. 9 to FIG. 13, an airway groove 10d is formed in the outer sidewall of the aerosol generating substrate 10, and the airway groove 10d extends through at least one end of the aerosol generating substrate 10 along the length direction, that is, the outer sidewall of the aerosol generating substrate 10 is partially recessed to form the airway groove 10d, equivalent to that a groove-shaped airway groove 10d may be seen on the outer sidewall of the aerosol generating substrate 10.

At least one end of the airway groove 10b that extends through the aerosol generating substrate 10 along the length direction may refer to that the airway groove 10b extends through the two opposite ends of the aerosol generating substrate 10 along the length direction, or one end of the airway groove 10b extends through the end surface of the aerosol generating substrate 10 along the length direction, and the other end of the airway groove 10b is a blind end. It can be understood that compared with the airway hole 10a extending through one end of the aerosol generating substrate 10 along the length direction, the airway hole 10a extending through the two ends of the aerosol generating substrate 10 along the length direction is more conducive to reducing the inhalation resistance when the user inhales the aerosols.

The outer wrapping layer 30 at the periphery of the aerosol generating substrate 10 may seal the airway groove 10d in the periphery of the aerosol generating substrate 10, so that the airway groove 10d can also serve as an airflow channel for the aerosols, thus increasing the air intake and aerosol extraction efficiency. In addition, in a case that the heating method of the heating component is circumferential heating, the overall heating rate of the aerosol generating substrate 10 can also be adjusted through this heating method, thus improving the user experience during inhaling.

The number of the airway grooves 10d is not limited here. For example, the number of the airway grooves 10d may be one or more.

It should be noted that the shape of the aerosol generating substrate 10 is not limited here. Exemplarily, on the plane perpendicular to the length direction of the aerosol generating substrate 10, the shape of the cross section of the aerosol generating substrate 10 includes, but is not limited to, a circular shape, an elliptical shape, a runway shape, or a polygonal shape. The embodiments of this application are described by taking the shape of the cross section of the aerosol generating substrate 10 being a circular shape as an example, that is, the aerosol generating substrate 10 is cylindrical.

The shape of the cross section of the aerosol generating substrate 10 refers to the shape of the section of the aerosol generating substrate 10 taken along a plane perpendicular to the length direction of the aerosol generating substrate 10.

The runway shape refers to a shape similar to an athletics track, which is composed of two semicircles and two parallel straight sides alternately connected.

It should be noted that the shape of the airway hole 10a is not limited here. Exemplarily, on the plane perpendicular to the length direction of the aerosol generating substrate 10, the shape of the cross section of the airway hole 10a includes, but is not limited to, a circular shape, an elliptical shape, a runway shape, a sector shape, or a polygonal shape. The polygonal shape includes regularly or irregularly polygonal shapes.

The shape of the cross section of the airway hole 10a refers to the shape of the section of the airway hole 10a taken along a plane perpendicular to the length direction of the aerosol generating substrate 10.

It should be noted that the shape of the airway groove 10d is not limited here. Exemplarily, in an embodiment, on the plane perpendicular to the length direction of the aerosol generating substrate 10, the shape of the cross section of the airway groove 10d includes, but is not limited to, a semi-circular shape, an arc shape, a V shape, a rectangular shape, or a trapezoidal shape.

In some other embodiments, on the plane perpendicular to the length direction of the aerosol generating substrate 10, the shape of the cross section of the airway groove 10d is the same as the local shape of the airway hole 10a, that is, the shape of the cross section of the airway groove 10d is the same as the local shape of the airway hole 10a. For example, the shape of the cross section of the airway hole 10a is a circular shape, and the shape of the cross section of the airway groove 10d is a semi-circular shape. In the molding process, the same mold for the airway holes 10a may be used for forming the airway groove 10d, thus facilitating the mold design, reducing the mold costs, and lowering the production costs.

In addition, the shapes of the cross sections of the airway holes 10a may be the same, or the shapes of the cross sections of at least two airway holes 10a may be different. For example, the shape of the cross section of at least one airway hole 10a may be a circular shape, and the shape of the cross section of at least one airway hole 10a may be a polygonal shape.

In a case that multiple airway grooves 10d are provided in the outer sidewall of the aerosol generating substrate 10, the shapes of the cross sections of the airway grooves 10d may be the same, or the shapes of the cross sections of at least two airway grooves 10d may be different. For example, the shape of the cross section of at least one airway groove 10d may be a semicircular shape, and the shape of the cross section of at least one airway groove 10d may be a polygonal shape.

Providing the airway holes 10a inside the aerosol generating substrate 10 can increase the inner surface area of the aerosol generating substrate 10, and improve the heating efficiency. At the same time, the aerosols flow out through the gaps or micropores in the partition walls between the airway holes 10a, are collected into the uniformly distributed airway holes 10a, and are conveyed to the inhalation end under the action of negative inhalation pressure. The uniform distribution of the airway holes 10a is conducive to the aerosol conveying uniformity and the heating uniformity, thus improving the user experience during inhaling.

Providing the airway grooves 10d in the outer sidewall of the aerosol generating substrate 10 can increase the outer surface area of the aerosol generating substrate 10. In addition to improving the heating efficiency and improving the user experience during inhaling, it is also conducive to the extraction of effective components. In addition, in a case that the heating method of the heating component is circumferential heating, the overall heating rate of the aerosol generating substrate 10 can also be adjusted through this heating method, thus improving the user experience during inhaling. At the same time, the aerosols can flow out through the gaps or micropores in the aerosol generating substrate 10, be collected in the airway grooves 10d, and be conveyed to the inhalation end under the action of negative inhalation pressure. The arrangement of the airway grooves 10d is conducive to the conveying of the aerosols, thus further improving the user experience.

Providing the airway holes 10a inside the aerosol generating substrate 10 and providing the airway grooves 10d in the outer sidewall of the aerosol generating substrate 10 can simultaneously increase the inner surface area and outer surface area of the aerosol generating substrate 10. Compared with only providing the airway holes 10a inside the aerosol generating substrate 10, a better effect can be achieved.

In an embodiment, referring to FIG. 4 to FIG. 8, the centerline of at least one airway hole 10a of the multiple airway holes 10a along the extension direction coincides with the central axis of the aerosol generating substrate 10 along the length direction, that is, an airway hole 10a is provided in the center of the aerosol generating substrate 10.

The central axis of the aerosol generating substrate 10 along the length direction is a virtual reference line.

The coincidence here refers to the approximate coincidence between the centerline of the airway hole 10a along the extension direction and the central axis of the aerosol generating substrate 10 along the length direction. That is to say, there may be certain deviation between the centerline of the airway hole 10a along the extension direction and the central axis of the aerosol generating substrate 10 along the length direction, and the central axis of the aerosol generating substrate 10 along the length direction approximately passes through the central airway hole 10a.

The airway hole 10a located on the central axis can collect the aerosols at the outlet of the substrate in the heating and inhaling process (the flow rate at the center hole of the substrate is fast, which can form a negative pressure zone at the outlet of the center hole of the substrate, thus collecting the aerosols flowing out of the holes in the periphery), thus improving the “agglomeration” of the aerosols. In addition, this arrangement can also improve the stability of aerosol temperature at the outlet of the substrate (the center hole has a fast aerosol flow rate and a small aerosol temperature change, thus reducing the temperature change rate after aerosol collection), thus improving the user experience during inhaling.

It should be noted that the airway hole 10a in the embodiments of this application may be a linear hole, that is to say, the airway hole 10a extends along a straight line; and the airway hole 10a may also be a curved hole, for example, extend in a spiral shape.

Exemplarily, the hydraulic diameter of the airway hole 10a is 0.05 mm to 6 mm (millimeters), for example, 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, and the like.

In the embodiments of this application, the hydraulic diameter refers to the ratio of four times the cross-sectional area of passage to the circumference. In a case that the hydraulic diameter of the airway hole 10a is greater than 6 mm, the number of the airway holes 10a is relatively small, the aerosol generating substrate 10 is prone to burning, and the aerosol generating substrate 10 is prone to non-uniform aerosol release in the heating process (for example, the aerosol release amount at the first two puffs is large, while the aerosol release amount at the last few puffs is small), thus affecting the user experience during inhaling.

In a case that the hydraulic diameter of the airway hole 10a is less than 0.05 mm, the difficulty of the molding process may significantly increase, and it is difficult to control the size of the airway hole 10a, thus increasing the defect rate of the aerosol generating substrate 10.

In a case that 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 (that is, the inhalation resistance is relatively small), the flow rate of the aerosols is appropriate, the aerosols inside the aerosol generating substrate 10 can be easily extracted, the aerosols can be released uniformly, the utilization rate is higher, the aerosol generating substrate 10 is less prone to burning, the user experience is better, and the manufacturing is facilitated.

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, and the like. Exemplarily, the area of the cross section of the airway hole 10a is 0.0019 mm² to 30 mm² (square millimeters), for example, 0.002 mm², 0.1 mm², 0.2 mm², 0.4 mm², 0.5 mm², 0.8 mm², 1 mm², 1.3 mm², 1.6 mm², 1.8 mm², 2 mm², 2.1 mm², 2.2 mm², 2.4 mm², 2.6 mm², 2.8 mm², 3 mm², 4 mm², 5 mm², 6 mm², and the like.

In the embodiments of this application, the area of the cross section refers to the cross-sectional area of passage.

In a case that the area of the cross section of the airway hole 10a is greater than 30 mm², the number of the airway holes 10a is relatively small, the aerosol generating substrate 10 is prone to burning, and the aerosol generating substrate 10 is prone to non-uniform aerosol release in the heating process (for example, the aerosol release amount at the first two puffs is large, while the aerosol release amount at the last few puffs is small), thus affecting the user experience during inhaling.

In a case that the area of the cross section of the airway hole 10a is less than 0.0019 mm², the difficulty of the molding process may significantly increase, and it is difficult to control the size of the airway hole 10a, thus increasing the defect rate of the aerosol generating substrate 10. In a case that the area of the cross section of the airway hole 10a is within the range of 0.0019 mm² to 30 mm², the flow resistance of the aerosol generating substrate 10 is relatively small (that is, the inhalation resistance is relatively small), the flow rate of the aerosols is appropriate, the aerosols inside the aerosol generating substrate 10 can be easily extracted, the aerosols can be released uniformly, the utilization rate is higher, the aerosol generating substrate 10 is less prone to burning, the user experience is better, and the manufacturing is facilitated.

Preferably, the area of the cross section of the airway hole 10a is 0.007 mm² to 7.1 mm² (square millimeters), for example, 0.1 mm², 0.2 mm², 0.4 mm², 0.5 mm², 0.8 mm², 1 mm², 1.3 mm², 1.6 mm², 1.8 mm², 2 mm², 2.1 mm², 2.2 mm², 2.4 mm², 2.6 mm², 2.8 mm², 3 mm², and the like.

While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive. It will be understood that changes and modifications may be made by those of ordinary skill within the scope of the following claims. In particular, the present invention covers further embodiments with any combination of features from different embodiments described above and below. Additionally, statements made herein characterizing the invention refer to an embodiment of the invention and not necessarily all embodiments.

The terms used in the claims should be construed to have the broadest reasonable interpretation consistent with the foregoing description. For example, the use of the article “a” or “the” in introducing an element should not be interpreted as being exclusive of a plurality of elements. Likewise, the recitation of “or” should be interpreted as being inclusive, such that the recitation of “A or B” is not exclusive of “A and B,” unless it is clear from the context or the foregoing description that only one of A and B is intended. Further, the recitation of “at least one of A, B and C” should be interpreted as one or more of a group of elements consisting of A, B and C, and should not be interpreted as requiring at least one of each of the listed elements A, B and C, regardless of whether A, B and C are related as categories or otherwise. Moreover, the recitation of “A, B and/or C” or “at least one of A, B or C” should be interpreted as including any singular entity from the listed elements, e.g., A, any subset from the listed elements, e.g., A and B, or the entire list of elements A, B and C.