KR102402063B1 - Insulation for aerosol-generating apparatus and aerosol-generating apparatus including the same - Google Patents

Abstract

An insulating material for an aerosol-generating device and an aerosol-generating device comprising the same are provided. An aerosol-generating device according to some embodiments of the present disclosure includes an outer housing forming an exterior, a heater disposed inside the outer housing, and a heater configured to heat an aerosol-generating substrate, and disposed between the outer housing and the heater, at least a portion It may include a heat insulating part having a waterproof film formed on the outer surface of the. The waterproofing membrane of the heat insulating part blocks absorption of sidestream smoke in the form of droplets, thereby preventing a problem of deterioration of the performance of the heat insulating material.

Description

Insulation material for an aerosol-generating device and an aerosol-generating device comprising the same

The present disclosure relates to an aerosol-generating device comprising the same as an insulating material for an aerosol-generating device. More particularly, it relates to a thermal insulation material for an aerosol-generating device, and an aerosol-generating device including the same, designed to prevent a problem of deterioration in thermal insulation performance as a result of absorbing sidestream smoke in a droplet form.

In recent years, there has been an increasing demand for alternative smoking articles that overcome the disadvantages of traditional cigarettes. For example, there is an increasing demand for an aerosol-generating device that generates an aerosol by electrically heating a cigarette (e.g. a cigarette-type electronic cigarette), and accordingly, research on an electrically heated aerosol-generating device is being actively conducted.

As a measure to increase energy efficiency, some electrically heated aerosol generators use cerakwool or aerogel insulation materials. However, as the thermal insulators of these materials absorb sidestream smoke that has been liquidated inside the device, the thermal conductivity gradually increases, and eventually loses its function as an insulator.

Unexamined Patent Publication No. 10-2019-0049390 Japanese Patent Laid-Open No. 2013-204658 Japanese Patent Laid-Open No. 2017-001943

A technical problem to be solved through some embodiments of the present disclosure is to provide an aerosol-generating device including an insulating material for an aerosol-generating device and an aerosol-generating device that is designed to prevent a problem that thermal insulation performance is deteriorated as the dropletized sidestream smoke is absorbed. .

The technical problems of the present disclosure are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above technical problem, an aerosol-generating device according to some embodiments of the present disclosure includes an external housing forming an exterior, a heater disposed inside the external housing, and heating an aerosol-generating substrate, and the external housing and the It is disposed between the heaters and may include a heat insulator in which a waterproofing film is formed on at least a portion of the outer surface.

In some embodiments, it further includes an inner housing disposed between the heat insulating part and the outer housing, wherein at least a portion of the inner housing may be implemented with a heat insulating material.

In some embodiments, at least a portion of the heat insulating part may be implemented as a porous structure formed by a plurality of hollow beads, and the waterproofing membrane may be formed on an outer surface of the porous structure.

In some embodiments, the waterproofing film may be a glass film.

In some embodiments, the waterproofing film may be a polyimide coating film.

In some embodiments, the waterproofing film may be a water-repellent coating film.

In some embodiments, the aerosol-generating substrate is solid and a receiving space is formed inside the outer housing to receive an aerosol-generating article comprising the aerosol-generating substrate, and the heater surrounds at least a portion of the receiving space. can be placed.

Insulation for an aerosol-generating device according to some embodiments of the present disclosure for solving the above-described technical problem may include a porous structure including a plurality of hollow beads and a waterproofing membrane formed on the outer surface of the porous structure have.

In some embodiments, the waterproofing membrane is a glass membrane, and the insulating material is a primary firing process of packing and firing the plurality of hollow beads, and a secondary firing process of applying a glass frit to the outer surface of the porous structure and firing It can be manufactured through a firing process.

According to various embodiments of the present disclosure described above, a heat insulating part having a waterproof membrane formed on an outer surface of the heat insulating material is disposed inside the aerosol generating device. Accordingly, the problem that the dropletized sidestream smoke is absorbed by the insulating material can be prevented in advance, and the performance of the insulating material can be continuously maintained.

In addition, a porous structure formed by a plurality of ceramic hollow beads is used as a heat insulating material. Such a porous structure has low thermal conductivity and excellent thermal insulation performance, thereby minimizing thermal energy loss.

Effects according to the technical spirit of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is an exemplary configuration diagram schematically showing an aerosol-generating device according to some embodiments of the present disclosure.
2 is a view for explaining an effect of a heat insulating unit according to some embodiments of the present disclosure.
3 is an exemplary flowchart illustrating a method of manufacturing an insulating material for an aerosol-generating device according to some embodiments of the present disclosure.
4 and 5 are exemplary views for explaining in detail a method of manufacturing an insulating material for an aerosol-generating device according to some embodiments of the present disclosure.
6 to 8 are exemplary block diagrams illustrating an aerosol-generating device to which an insulating material according to some embodiments of the present disclosure may be applied.

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Advantages and features of the present disclosure, and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the technical spirit of the present disclosure is not limited to the following embodiments, but may be implemented in various different forms, and only the following embodiments complete the technical spirit of the present disclosure, and in the technical field to which the present disclosure belongs It is provided to fully inform those of ordinary skill in the art of the scope of the present disclosure, and the technical spirit of the present disclosure is only defined by the scope of the claims.

In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present disclosure, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present disclosure, the detailed description thereof will be omitted.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which this disclosure belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular. The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present disclosure. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase.

In addition, in describing the components of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is formed between each component. It should be understood that elements may also be “connected,” “coupled,” or “connected.”

As used herein, “comprises” and/or “comprising” refers to a referenced component, step, operation and/or element of one or more other components, steps, operations and/or elements. The presence or addition is not excluded.

Prior to a description of various embodiments of the present disclosure, some terms used herein will be made clear.

In the present specification, "aerosol-generating substrate" may mean a material capable of generating an aerosol (aerosol). Aerosols may contain volatile compounds. The aerosol-generating substrate may be solid or liquid.

For example, the solid aerosol-generating substrate may include a solid material based on tobacco raw materials such as leaf tobacco, cut filler, reconstituted tobacco, etc., and the liquid aerosol-generating substrate contains nicotine, tobacco extract and/or various flavoring agents. liquid compositions based on it. However, the scope of the present disclosure is not limited to the examples listed above.

As a more specific example, the liquid aerosol-generating substrate may include at least one of propylene glycol (PG) and glycerin (GLY), and ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol and oleic acid. It may further include at least one of one alcohol. As another example, the aerosol-generating substrate may further include at least one of nicotine, moisture, and a flavoring substance. As another example, the aerosol-generating substrate may further include various additives such as cinnamon and capsaicin. The aerosol-generating substrate may include a material in the form of a gel or solid as well as a liquid material having high flowability. As such, the composition of the aerosol-generating substrate may be variously selected according to the embodiment, and the composition ratio thereof may also vary depending on the embodiment.

As used herein, "aerosol-generating device" may refer to a device that generates an aerosol using an aerosol-generating substrate to generate an aerosol that can be directly inhaled into the user's lungs through the user's mouth. The aerosol-generating device may include, for example, a liquid-type aerosol-generating device using a liquid vaporizer, and a hybrid aerosol-generating device using a liquid vaporizer and a cigarette together. However, in addition, various types of aerosol-generating devices may be further included, so the scope of the present disclosure is not limited to the examples listed above. Reference is made to FIGS. 6 to 8 for some examples of aerosol-generating devices.

In this specification, "puff" refers to inhalation of a user, and inhalation may refer to a situation in which the user is drawn into the user's mouth, nasal cavity, or lungs through the user's mouth or nose.

As used herein, "upstream" or "upstream direction" means a direction away from the smoker's bend, and "downstream" or "downstream direction" may mean a direction approaching from the smoker's bend. .

Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram illustrating an aerosol-generating device 100 according to some embodiments of the present disclosure.

As shown in FIG. 1 , the aerosol-generating device 100 may include an outer housing 11 , an inner housing 12 , a heater 14 , and a heat insulator 13 . However, only the components related to the embodiment of the present disclosure are illustrated in FIG. 1 . Accordingly, one of ordinary skill in the art to which the present disclosure pertains can know that other general-purpose components other than those shown in FIG. 1 may be further included. For example, although not shown, the aerosol-generating device 100 includes a battery (not shown) that supplies power to the heater 14, and the components of the aerosol-generating device 100 (e.g. the heater 14, a battery, etc.) It may further include a control unit (not shown) for controlling the. Hereinafter, each component of the aerosol generating device 100 will be described.

The outer housing 11 may form the exterior of the aerosol-generating device 100 . In addition, the outer housing 11 may form a receiving space for receiving the aerosol-generating article 2 . The aerosol-generating article 2 may be electrically heated while being inserted into the receiving space to generate an aerosol, and the generated aerosol may be inhaled by the user through the mouth. The aerosol-generating article 2 may be, for example, a cigarette, although the scope of the present disclosure is not limited to this example.

The portion 21 of the aerosol-generating article 2 may comprise a solid aerosol-generating substrate. The solid aerosol-generating substrate may be heated by a heater 14 to form an aerosol.

Next, the inner housing 12 may define the inner structure of the aerosol-generating device 100 . The material, arrangement, etc. of the inner housing 12 may be variously modified according to the internal design of the aerosol generating device 100 .

In some embodiments, at least a portion of the inner housing 12 may be implemented with an insulating material. In this case, heat (energy) loss to the outside of the aerosol-generating device 100 may be more effectively blocked.

The heater 14 may then heat the aerosol-generating article 2 contained in the receiving space. For example, the heater 14 may be arranged to surround at least a portion of the receiving space to heat the aerosol-generating article 2 . The heater 14 may be, for example, an electrically resistive heater, but the scope of the present disclosure is not limited to the above example, and various types of heaters may be employed as a component of the aerosol generating device 100 .

Next, the heat insulating part 13 may be disposed between the inner housing 12 and the heater 14 to prevent heat loss of the aerosol-generating device 100 . The insulation 13 allows the heat generated by the heater 14 to be concentrated on the aerosol-generating article 2 , thereby improving the heating efficiency of the heater 14 and improving the taste sensation of the aerosol-generating article 2 . can do it In addition, the heat insulating unit 13 may shorten the preheating time of the aerosol generating device 100 and also reduce power consumption.

In some embodiments, the heat insulating part 13 may include a heat insulating material and a waterproofing film formed on the outer surface of the heat insulating material. By forming the waterproofing film, the problem in which the dropletized sidestream smoke (or other moisture) is absorbed by the heat insulating material and deteriorates the heat insulating performance can be prevented in advance. In addition, since the waterproof membrane blocks the external airflow, the performance of the heat insulating unit 13 may be further improved. In order to provide more convenience of understanding, the effect of the heat insulating part 13 will be described in more detail with reference to FIG. 2 .

As shown in FIG. 2 , sidestream smoke is generated from the upstream end of the cigarette 23 in addition to the mainstream smoke sucked through the user's mouth during the smoking process. The generated sidestream smoke may be formed into droplets inside the aerosol generating device 100. Even in this case, since the waterproof film formed on the outer surface of the insulator prevents the dropletized sidestream smoke from being absorbed, the performance of the insulation unit 13 is continuously maintained. can be

On the other hand, the type of the waterproofing film may vary according to the embodiment. For example, the waterproof film may include a glass film, a polyimide coating film, a water repellent coating film, or a combination thereof. However, the scope of the present disclosure is not limited to the examples listed above, and other types of coating films having a waterproof (or moisture-proof) function may be used.

In some embodiments, the insulating material inside the waterproofing membrane may be implemented as a porous structure formed by a plurality of hollow beads (bead). In this case, it may be preferable that the material of the bead is, for example, a ceramic bead having low thermal conductivity. In addition, the ceramic beads may include ceramic silica beads and ceramic alumina beads. However, the scope of the present disclosure is not limited to the examples listed above, and hollow beads made of other materials having low thermal conductivity may be used.

So far, the aerosol-generating device 100 according to some embodiments of the present disclosure has been described with reference to FIG. 1 . According to the above-mentioned, the heat insulating part 13 in which a waterproofing film is formed on the outer surface of the heat insulating material is disposed inside the aerosol generating device 100 . Accordingly, the problem that the dropletized sidestream smoke is absorbed by the heat insulating material can be prevented in advance, and the performance of the heat insulating part 13 can be continuously maintained. Furthermore, the heat of the heater 14 is effectively concentrated on the aerosol-generating article 2 through the insulation 13 , thereby improving the taste of the aerosol-generating article 2 , and increasing the preheating time of the aerosol-generating device 100 and Power consumption can be reduced.

Hereinafter, a thermal insulation material for an aerosol-generating device and a manufacturing method thereof according to some embodiments of the present disclosure will be described. The insulating material for the aerosol generating device may correspond to the above-described insulating part 13 .

3 is an exemplary flowchart illustrating a method of manufacturing an insulating material for an aerosol-generating device according to some embodiments of the present disclosure.

As shown in FIG. 3 , the manufacturing method may include a step S10 of forming a porous structure and a step S20 of forming a waterproofing film on the surface of the porous structure. Hereinafter, each step will be described.

In step S10, a porous structure may be formed by packing a plurality of hollow beads. For example, as shown in FIG. 4 , the porous structure 131 may be formed by sphere packing a plurality of hollow beads 20 . The method of packing the spheres may be, for example, a body-centered cubic structure (BCC), a face-centered cubic structure, and the like, but the scope of the present disclosure is not limited to the above examples.

In some embodiments, the hollow bead may be a ceramic bead. In this embodiment, a porous structure may be formed by packing and firing a plurality of hollow ceramic beads.

In some embodiments, the diameter of the hollow beads may be between 75 μm and 500 μm. Preferably, the diameter of the hollow beads may be 100 μm to 450 μm, 150 μm to 450 μm, or 150 μm to 400 μm. Within this numerical range, excellent thermal insulation performance and ease of manufacture may be secured. For example, it may be preferable that the diameter of the hollow beads be 75 μm or more, because the larger the size of the hollow beads, the better the thermal insulation performance of the porous structure. In addition, it may be preferable that the diameter of the hollow beads be 500 μm or less, because as the size of the hollow beads increases, the surface curvature increases, thereby increasing the cost and difficulty required to form the waterproofing film.

Also, in some embodiments, the diameter distribution of the plurality of hollow beads may have an error range of within 30% of the average diameter. Preferably, the diameter distribution of the plurality of beads may have an error range of within 25%, 23% or 21%. More preferably, the diameter distribution of the plurality of beads may have an error range of within 20%, 18%, 16%, 14%, 12% or 10%. Even more preferably, the diameter distribution of the plurality of beads may have an error range of within 8%, 6% or 5%. Since it is not easy to continuously manufacture beads having the same diameter, the cost and difficulty required for manufacturing the porous structure within this error range can be greatly reduced.

On the other hand, according to some embodiments of the present disclosure, the initial porous structure is formed by packing the hollow beads of the first size, and the final porous structure is formed by packing the hollow beads of the second size on the outer surface of the initial porous structure. You may. In this case, the second size may have a smaller value than the first size. In this case, since the pore size of the outer surface of the porous structure becomes small, the waterproofing film forming process can be easily performed. In addition, by forming the initial porous structure with a hollow bead of a sufficiently large size, the performance of the insulating material can be improved.

In step S20, a waterproof membrane may be formed on the outer surface of the porous structure. For example, as shown in FIG. 5 , a waterproofing membrane 133 may be formed on the outer surface of the porous structure 131 . In this case, penetration of moisture through pores on the surface of the porous structure 131 may be prevented, and an external airflow may be blocked.

The type of the waterproofing film may vary according to the embodiment.

In some embodiments, the waterproofing membrane may be a glass membrane. In this embodiment, the insulating material is manufactured through a primary firing process of firing a porous structure (e.g. ceramic hollow bead-based porous structure) and a secondary firing process of applying and firing a glass frit to the outer surface of the porous structure can be In this case, it may be preferable to use a glass frit having a melting point lower than the firing temperature of the porous structure. This is because, when the melting point of the glass frit is higher than the firing temperature of the porous structure, a phenomenon in which the outer surface of the porous structure is melted may occur during the secondary firing process. For example, the firing temperature of the porous structure may preferably exceed 800 degrees, and the melting point of the glass frit may preferably be 600 degrees to 800 degrees.

In some other embodiments, the waterproofing film may be a polyimide coating film.

In some other embodiments, the waterproofing film may be a water-repellent coating film.

In some other embodiments, the waterproofing film may be based on a combination of the previous embodiments. For example, the waterproof membrane may be implemented in the form of a double membrane including a glass membrane and a water-repellent coating layer, and in this case, the performance of the waterproof membrane may be further improved.

So far, it has been described with reference to FIGS. 3 to 5 with respect to the insulating material for an aerosol-generating device according to some embodiments of the present disclosure and a manufacturing method thereof. Hereinafter, various types of aerosol-generating devices 100-1 to 100-3 to which an insulating material (insulation unit) according to an embodiment can be applied will be introduced with reference to FIGS. 6 to 8 .

6 to 8 are exemplary block diagrams illustrating the aerosol-generating devices 100-1 to 100-3. Although not shown in detail in the drawings, the heat insulating material according to the embodiment may be disposed around the heater 140 . Also, the heater 140 may correspond to the heater 14 illustrated in FIG. 1 .

6 illustrates a cigarette-type aerosol-generating device 100-1, and FIGS. 7 and 8 illustrate hybrid-type aerosol-generating devices 100-2 and 100-3 using a liquid and a cigarette together. Hereinafter, each aerosol generating device 100-1 to 100-3 will be described.

As shown in FIG. 6 , the aerosol generating device 100 - 1 may include a heater 140 , a battery 130 , and a control unit 120 . However, this is only a preferred embodiment for achieving the purpose of the present disclosure, and it goes without saying that some components may be added or omitted as necessary. In addition, each component of the aerosol-generating device 100-1 shown in FIG. 6 represents functionally distinct functional elements, in which a plurality of components are implemented in a form that is integrated with each other in an actual physical environment, or a single component The element may be implemented in a form in which the element is divided into a plurality of detailed functional elements. Hereinafter, each component of the aerosol generating device 100-1 will be described.

The heater 140 may be disposed around the cigarette 150 to heat the cigarette 150 . The cigarette 150 includes a solid aerosol-generating substrate and is capable of generating an aerosol as it is heated. The generated aerosol can be inhaled through the mouth of the user. The heater 140 may be, for example, an electrically resistive heater, but is not limited thereto. The heater 140 or the heating temperature of the heater 140 may be controlled by the controller 120 .

An insulating material for an aerosol-generating device according to the embodiment (13 in FIG. 1 ) may be disposed around the heater 140 , thereby reducing heat energy loss to the outside and improving the heating efficiency of the heater 140 . have. In addition, the taste of the cigarette 150 may be improved and the preheating time and power consumption of the aerosol generating device 100 - 1 may be reduced.

Next, the battery 130 may supply power used to operate the aerosol generating device 100 - 1 . For example, the battery 130 may supply power to the heater 140 to heat the aerosol-generating substrate included in the cigarette 150 , and may supply power required for the control unit 120 to operate.

In addition, the battery 130 may supply power required to operate electrical components such as a display (not shown), a sensor (not shown), and a motor (not shown) installed in the aerosol generating device 100-1.

Next, the controller 120 may control the overall operation of the aerosol generating device 100 - 1 . For example, the controller 120 may control the operation of the heater 140 and the battery 130 , and may also control the operation of other components included in the aerosol generating device 100 - 1 . The controller 120 may control the power supplied by the battery 130 , the heating temperature of the heater 140 , and the like. In addition, the controller 120 may determine whether the aerosol-generating device 100-1 is in an operable state by checking the state of each of the components of the aerosol-generating device 100-1.

The controller 120 may be implemented by at least one processor. The processor may be implemented as an array of a plurality of logic gates, or may be implemented as a combination of a general-purpose microprocessor and a memory in which a program executable in the microprocessor is stored. In addition, those of ordinary skill in the art to which the present disclosure pertains can clearly understand that the controller 120 may be implemented with other types of hardware.

Hereinafter, the hybrid aerosol generating devices 100-2 and 100-3 will be briefly described with reference to FIGS. 7 and 8 .

7 illustrates an aerosol-generating device 100-2 in which a vaporizer 1 and a cigarette 150 are arranged in parallel, and FIG. 8 is an aerosol in which the vaporizer 1 and the cigarette 150 are arranged in series. A generating device 100-3 is illustrated. However, the internal structure of the aerosol-generating device is not limited to those illustrated in FIGS. 7 and 8 , and the arrangement of components may be changed according to a design method.

7 and 8 , the vaporizer 1 comprises a liquid reservoir for storing a liquid aerosol-generating substrate, a wick for absorbing the aerosol-generating substrate, and a heating element for heating the absorbed aerosol-generating substrate to generate an aerosol. may include The aerosol generated by the vaporizer 1 may pass through the cigarette 150 and be inhaled through the user's mouth. The heating element of the vaporizer 1 may also be controlled by the control unit 120 .

So far, exemplary aerosol-generating devices 100-1 to 100-3 to which a thermal insulation material according to some embodiments of the present disclosure can be applied have been described with reference to FIGS. 6 to 8 .

In the above, even though all components constituting the embodiment of the present disclosure are described as being combined or operated in combination, the technical spirit of the present disclosure is not necessarily limited to this embodiment. That is, within the scope of the present disclosure, all of the components may operate by selectively combining one or more.

Although embodiments of the present disclosure have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present disclosure pertains may practice the present disclosure in other specific forms without changing the technical spirit or essential features. can understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present disclosure should be interpreted by the following claims, and all technical ideas within the equivalent range should be interpreted as being included in the scope of the technical ideas defined by the present disclosure.

1: Vaporizer 2: Aerosol-generating article
11: outer housing 12: inner housing
13: insulation 14: heater
100, 100-1, 100-2, 100-3: aerosol generating device
120: control unit 130: battery
140: heater 150: cigarette

Claims (14)

an outer housing defining an exterior;
an inner housing disposed on an inner surface of the outer housing and at least a portion of which is implemented with a heat insulating material;
a heater disposed to surround at least a portion of the receiving space to heat the aerosol-generating substrate; and
A porous structure disposed between the heater and the inner housing to face the heater and including a heat insulating part in which a glass film, which is a waterproof film, is formed on at least a portion of the outer surface,
The insulator is
After packing a hollow bead of a first size to form an initial porous structure, and packing a hollow bead of a second size smaller than the first size on the outer surface of the initial porous structure to form a final porous structure, the final porous structure A glass film, which is a waterproof film made of a non-metallic material, is formed on the outer surface of the structure.
aerosol-generating device. delete According to claim 1,
At least a portion of the heat insulating part is implemented as a porous structure formed by a plurality of hollow beads (bead),
A glass membrane that is the waterproof membrane is formed on the outer surface of the porous structure,
aerosol-generating device. 4. The method of claim 3,
The hollow beads are hollow ceramic beads,
aerosol-generating device. 5. The method of claim 4,
The hollow ceramic beads include hollow ceramic alumina beads or hollow ceramic silica beads,
aerosol-generating device. 4. The method of claim 3,
The diameter of the hollow beads is 75㎛ to 500㎛,
aerosol-generating device. delete According to claim 1,
The heat insulating part further comprises a porous structure,
Manufactured through a primary firing process of firing the porous structure and a secondary firing process of applying and firing a glass frit to the outer surface of the porous structure,
aerosol-generating device. 9. The method of claim 8,
The melting point of the glass frit is lower than the firing temperature of the porous structure,
aerosol-generating device. delete delete According to claim 1,
The aerosol-generating substrate is a solid,
An accommodation space for accommodating an aerosol-generating article comprising the aerosol-generating substrate is formed inside the outer housing;
The heater is arranged to surround at least a portion of the accommodation space,
aerosol-generating device. A porous structure comprising a plurality of hollow beads (bead); and
Including a glass membrane, which is a waterproof membrane made of a non-metallic material, formed on the outer surface of the porous structure,
The porous structure,
After packing a hollow bead of a first size to form an initial porous structure, and packing a hollow bead of a second size smaller than the first size on the outer surface of the initial porous structure to form a final porous structure, the final porous structure A glass film, which is a waterproof film made of a non-metallic material, is formed on the outer surface of the structure.
Insulation for aerosol-generating devices. delete

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