Heating sheet and preparation method thereof, heating assembly and aerosol generating device

Abstract

The invention belongs to the technical field of aerosol generating devices, and particularly relates to a heating sheet and a preparation method thereof, a heating assembly and an aerosol generating device. The heating sheet comprises a metal base material and an isolation layer at least wrapping the surface of a working area of the metal base material, and the dissolution temperature of the isolation layer is 45-60 DEG C. According to the heating sheet, the physically isolated isolation layer is constructed on the surface of the metal base material of the heating sheet, so that the aerosol generating matrix can be prevented from being in contact with the metal base material in the heating sheet during the shelf life, metal ions are prevented from migrating, and meanwhile, the metal base material is prevented from reacting with the aerosol generating matrix to corrode and generate byproducts; therefore, the influence on the aerosol generating matrix components and the aerosol taste is reduced. Meanwhile, the isolating layer can be quickly melted at the temperature of 45-60 DEG C, and the normal heating function is not interfered. And the shelf life safety and the use reliability of the heating sheet and the aerosol generating substrate are both considered.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aerosol generating device, and particularly relates to a heating sheet, a preparation method thereof, a heating assembly and an aerosol generating device. BACKGROUND

[0002] An aerosol generating device is an electronic device that generates aerosol by heating. The aerosol generating device generally includes a heating assembly, a power assembly, a control assembly, and the like. The heating assembly is a core part of the aerosol generating device, and mainly includes a heating sheet and a liquid storage material. The heating sheet is usually made of metal materials such as nickel, chromium, and iron. The liquid storage material stores an aerosol generating substrate. The heating sheet directly contacts the aerosol generating substrate. During the shelf life, metal ions in the heating sheet migrate to the aerosol generating substrate. At the same time, acidic components (such as citric acid) in the aerosol generating substrate corrode the surface of the heating sheet, and flavor molecules (such as monoterpene) catalyze the surface of the metal to generate potentially harmful substances (such as free radicals or thermal decomposition products).

[0003] Therefore, during the shelf life, the long-term contact between the heating sheet and the aerosol generating substrate causes corrosion, changes the composition of the aerosol generating substrate, and thus affects the stability of the aerosol generating substrate and the user's experience. SUMMARY

[0004] The application aims to provide a heating sheet and a preparation method thereof, and a heating assembly and an aerosol generating device, and to solve the problem that the long-term contact between the existing metal heating sheet and the aerosol generating substrate during the shelf life causes corrosion, changes the composition of the aerosol generating substrate, and thus affects the taste of the aerosol.

[0005] To achieve the above-mentioned application purposes, the technical solutions adopted by the application are as follows: In a first aspect, the application provides a heating sheet, which includes a metal substrate and an isolation layer covering at least the working area surface of the metal substrate. The dissolution temperature of the isolation layer is 45°C to 60°C.

[0006] In some possible implementation manners, the thickness of the isolation layer is 5μm to 20μm.

[0007] In some possible implementation manners, the isolation layer includes a film-forming material.

[0008] In some possible implementation manners, the isolation layer includes at least one of a plasticizer, a solubilizer, and a film-forming material.

[0009] In some possible implementation manners, the film-forming material includes at least one of gelatin, hydroxypropyl methylcellulose, arabic gel, polyvinyl alcohol, pullulan, and methylcellulose.

[0010] In some possible implementation manners, the plasticizer includes at least one of triethyl citrate, L-arabinose, glycerol, polyethylene glycol, sorbitol, and prussian polysaccharide.

[0011] In some possible implementation manners, the solubilizing agent includes at least one of sodium alginate, Tween, propylene glycol, and β-cyclodextrin.

[0012] In some possible implementation manners, in the isolation layer, the mass ratio of the film-forming material, the plasticizer, and the solubilizing agent is (5-30):(1-10):(1-10).

[0013] In some possible implementation manners, the isolation layer includes a first isolation layer arranged in abutment with the metal substrate, and a second isolation layer arranged on a surface of the first isolation layer away from the metal substrate; wherein the first isolation layer includes the film-forming material and the plasticizer; and the second isolation layer includes the film-forming material and the solubilizing agent.

[0014] In some possible implementation manners, in the first isolation layer, the gelatin, the hydroxypropyl methyl cellulose, and the triethyl citrate are included in a mass ratio of (8-15):(2-10):(1-5).

[0015] In some possible implementation manners, the thickness of the first isolation layer is 8 μm-15 μm.

[0016] In some possible implementation manners, in the second isolation layer, the gelatin and the sodium alginate are included in a mass ratio of (5-10):(1-6).

[0017] In some possible implementation manners, the thickness of the second isolation layer is 3 μm-8 μm.

[0018] In some possible implementation manners, the isolation layer is dissolved for no more than 30 s at a temperature of 45°C-60°C.

[0019] In a second aspect, the present application provides a preparation method of a heating sheet, including the following steps: Preparation of an isolation slurry; Obtaining a metal substrate, forming an isolation slurry layer on at least a surface of a working area of the metal substrate by using the isolation slurry, and curing to form an isolation layer, thereby obtaining a heating sheet; wherein the dissolution temperature of the isolation layer is 45°C-60°C.

[0020] In some possible implementation manners, in the isolation slurry, the film-forming material is included in a mass percentage of 5%-30%, the plasticizer is included in a mass percentage of 0-10%, and the solubilizing agent is included in a mass percentage of 0-10%.

[0021] In some possible implementation manners, the thickness of the isolation layer is 5 μm to 20 μm.

[0022] In some possible implementation manners, after the metal base material is obtained, the method further includes a processing step of performing plasma cleaning on the surface of the metal base material.

[0023] In some possible implementation manners, the manner of forming the isolation paste into the isolation paste layer includes electrostatic spraying and / or dip-coating.

[0024] In some possible implementation manners, the processing manner of solidification includes ultraviolet light solidification.

[0025] In some possible implementation manners, the condition of the plasma cleaning includes: under the condition of an Ar and O2 mixed gas with a radio frequency power of 50 W to 100 W and a volume ratio of (7 to 9) to (1 to 3), processing for 90 s to 120 s.

[0026] In some possible implementation manners, the condition of the electrostatic spraying includes: a high-voltage generator voltage of 8 kV to 12 kV, a pulse frequency of 5 kHz to 10 kHz, a nozzle aperture of 80 μm to 150 μm, a flow rate of 2 mL / min to 5 mL / min, and constant-temperature liquid supply at 45°C to 50°C.

[0027] In some possible implementation manners, the power of the ultraviolet light solidification is 60 mW / cm 2 to 120 mW / cm 2 , and the time length is 10 min to 30 min.

[0028] In a third aspect, the present application provides a heating assembly, including the heating sheet and / or the heating sheet prepared by the method.

[0029] In a fourth aspect, the present application provides an aerosol generating device, including a power assembly and the heating assembly.

[0030] The heating sheet provided in the first aspect of the present application has an isolation layer coated on the surface of the working area of the metal substrate. By constructing a physically isolated isolation layer on the surface of the metal substrate of the heating sheet, the contact between the aerosol generating substrate and the metal substrate in the heating sheet during the shelf life is prevented, the migration of metal ions is prevented, and the reaction and corrosion of the metal substrate with the aerosol generating substrate to generate byproducts are prevented, thereby reducing the influence on the composition of the aerosol generating substrate and the taste of the aerosol. The storage stability of the heating sheet and the aerosol generating substrate is ensured, and even during long-term storage during the shelf life, the stability of the composition of the aerosol generating substrate can be maintained, thereby maintaining the stability of the taste of the aerosol and the original flavor. In addition, the isolation layer can be dissolved at a temperature of 45℃ to 60℃, rapidly melts from the surface of the metal substrate of the heating sheet, and does not interfere with the normal heating function. The shelf life safety and use reliability of the heating sheet and the aerosol generating substrate are considered, and the problems of composition degradation and taste degradation caused by the reaction and corrosion of the metal of the heating sheet with the aerosol generating substrate are fundamentally solved.

[0031] The preparation method of the heating sheet of the present application is to prepare an isolation slurry, and then form an isolation slurry layer on the surface of the working area of the metal substrate, and solidify to form an isolation layer. The isolation layer constructed on the surface of the metal substrate of the heating sheet physically isolates the metal substrate from the aerosol generating substrate, completely prevents the corrosion of the metal substrate by the aerosol generating substrate and the migration process of metal ions, ensures the storage stability of the heating sheet and the aerosol generating substrate, and even during long-term storage during the shelf life, the stability of the composition of the aerosol generating substrate can be maintained, thereby maintaining the stability of the taste of the aerosol and the original flavor. During use, the isolation layer rapidly melts and disappears as the temperature rises during the initial stage of starting, and does not affect the normal heating function of the heating sheet and the aerosolization effect on the aerosol generating substrate.

[0032] The heating assembly provided in the present application successfully converts the advantages of the innovative structure at the single layer level into reliable performance at the component level by integrating the above-mentioned heating sheet with a specific isolation layer (or using the above-mentioned method to prepare the heating sheet). This makes the heating assembly completely eliminate metal ion migration and deterioration of the composition of the aerosol generating substrate during the shelf life, ensuring the long-term stability and safety of the aerosol generating substrate. During operation, the rapid ablation of the isolation layer ensures that its heating efficiency, response speed, and aerosolization effect are the same as those of the traditional component without coating. Ultimately, the user can enjoy a pure taste and consistent quality of use experience.

[0033] The aerosol generating device provided in the application realizes a leap in the overall performance of the product by integrating the power supply assembly and the heating assembly, completely eliminates the risk of metal ion migration and aerosol generating substrate deterioration during the shelf life of the aerosol generating device due to the physical barrier effect of the isolation layer in the heating assembly, and ensures the long-term stability of the factory quality; when the user starts, the isolation layer can be removed instantly by the power supply assembly, so that the device quickly enters the best working state and outputs aerosol with pure taste and consistent quality. This design fundamentally solves the industry problem of quality degradation caused by long-term storage and provides users with a perfect smoking experience that is safe, stable and reliable from the first use to the final experience. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 is a schematic diagram of the cross-sectional structure of the heating sheet provided in the embodiments of the present application; Figure 2 is a schematic diagram of the preparation method of the heating sheet provided in the embodiments of the present application. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear, the present application will be further described in detail in combination with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0037] In the present application, the term "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0038] In the present application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, "at least one of a, b or c", or "at least one of a, b and c", can mean a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, wherein a, b and c can be single or multiple.

[0039] It should be understood that the size of the sequence number of the above-mentioned processes does not mean the order of execution in various embodiments of the present application, and part or all of the steps can be executed in parallel or in sequence, and the execution order of the processes should be determined according to their functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0040] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0041] The weight of the related components mentioned in the embodiments of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of each component, therefore, as long as the content of the related components in the embodiments of the present application is enlarged or reduced in proportion, it is within the scope disclosed in the embodiments of the present application. Specifically, the mass mentioned in the embodiments of the present application can be µg, mg, g, kg and other mass units commonly known in the chemical field.

[0042] The terms "first", "second" are only for the purpose of description, used to distinguish objects such as substances from each other, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX can also be referred to as the second XX, and similarly, the second XX can also be referred to as the first XX. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features.

[0043] An aerosol generating device is an electronic device that generates an aerosol by heating means, and generally includes a heating assembly, a power supply assembly, a control assembly, and the like. The heating assembly is the core part of the aerosol generating device, mainly including a heating sheet, a liquid storage material, etc., and the heating sheet often directly contacts the aerosol generating substrate. During the shelf life, the metal ions of the heating sheet made of nickel, chromium, iron and other metal materials will migrate into the aerosol generating substrate during the long-term contact with the aerosol generating substrate. At the same time, the acidic components (such as citric acid) in the aerosol generating substrate will corrode the surface of the heating sheet, and the flavor molecules (such as monoterpene) will catalyze the reaction with the metal surface to generate potentially harmful substances (such as free radicals or thermal decomposition products).

[0044] To solve the problem that the existing metal heating sheet is in long-term contact with the aerosol generating substrate during the shelf life, which can cause corrosion and change the composition of the aerosol generating substrate, thereby affecting the taste of the aerosol. The methods mainly focus on two aspects: one is to improve the heating substrate itself, and use more corrosion-resistant metal alloys (such as stainless steel, nickel-chromium alloy) to delay ion migration and corrosion; the second is to optimize the formula of the aerosol generating substrate, for example, adjust the pH value to reduce acidity or choose a lower reactive flavor, to reduce the corrosion of the metal from a chemical point of view. These methods all try to improve the intrinsic resistance or compatibility of the material to alleviate the problem, rather than setting up a physical barrier at the interface. These methods have a fundamental flaw: improving the metal substrate can only delay but cannot fundamentally prevent long-term corrosion and ion migration in a high-acidity or high-activity flavor environment; and optimizing the formula of the aerosol substrate seriously limits the flexibility of taste development, and adjusting the pH value may sacrifice the taste or aerosol efficiency, which is a compromise solution. Both of them do not establish an effective physical isolation barrier between the metal and the substrate, so they cannot balance long-term stability and rich taste experience at the same time.

[0045] Currently, the main obstacle of setting an isolation layer on the surface of the heating sheet is that it is difficult to find a special material that can meet the requirements of stable barrier (prevent corrosion and reaction during storage period) at room temperature and rapid dissolution (ensure normal heating and not affect the taste during use) at low temperature at the same time, and there is a technical prejudice in the industry that adding any coating will permanently degrade the heat conduction efficiency and increase the safety risk, and the preparation process of ultra-thin and uniform coating is also challenging.

[0046] Based on the above considerations, in order to solve the above problems. After in-depth research, the first aspect of the embodiments of the present application provides a heating sheet, as shown in the accompanying drawings Figure 1 As shown, it comprises a metal substrate and at least an isolation layer coated on the surface of the working area of the metal substrate, and the dissolution temperature of the isolation layer is 45℃-60℃.

[0047] The heating sheet provided in the first aspect of the embodiments of the present application has an isolation layer coated on the surface of the working area of the metal substrate. By constructing a physically isolated isolation layer on the surface of the metal substrate of the heating sheet, the aerosol generating substrate can be prevented from contacting the metal substrate in the heating sheet during the shelf life, metal ion migration is prevented, and the metal substrate is prevented from reacting with the aerosol generating substrate to generate by-products, thereby reducing the influence on the composition of the aerosol generating substrate and the taste of the aerosol. The storage stability of the heating sheet and the aerosol generating substrate is ensured, and even if the shelf life is stored for a long time, the stability of the composition of the aerosol generating substrate can be maintained, thereby maintaining the stability of the taste of the aerosol and the original flavor. In addition, the isolation layer can be dissolved at a temperature of 45℃ to 60℃, and quickly melts from the surface of the metal substrate of the heating sheet without interfering with the normal heating function. The shelf life safety and use reliability of the heating sheet and the aerosol generating substrate are considered, and the problems of composition degradation and taste degradation caused by the reaction and corrosion of the metal of the heating sheet and the aerosol generating substrate are fundamentally solved.

[0048] The working area of the metal substrate in the heating sheet of the embodiments of the present application refers to the surface area of the metal substrate that reaches a high temperature during normal operation (i.e. in the power-on heating state) and mainly exchanges heat with the aerosol generating substrate to generate aerosol. The isolation layer at least coats the surface of the working area of the metal substrate, precisely protects the heating sheet, reduces costs, ensures the reliability of electrical connection, and maintains structural integrity and mechanical properties.

[0049] The heating sheet of the embodiments of the present application, when the aerosol generating device is used for the first time, the isolation layer is quickly dissolved by the low-power preheating of the heating sheet during the initial start-up stage, and then the aerosol generating device can be used normally. By constructing a soluble isolation layer on the surface of the heating sheet, the embodiments of the present application realize constant-temperature solid-state isolation. When the aerosol generating device is started for the first time, the isolation layer on the surface of the heating sheet can be removed by preheating and dissolution during the low-power operation stage of the device.

[0050] The shelf life in the embodiments of the present application refers to the entire storage period experienced by the aerosol-generating device after production is completed, after packaging, after entering the warehousing, transportation, and sales links, and before being purchased by a consumer and being used. In simple terms, it is the idle storage period between the time when the product is "delivered from the factory" and the time when it is "first used by the user". This period may last for several weeks, months, or even longer. Although there is no power heating during the shelf life, the acidic components and organic solvents in the aerosol-generating substrate will continue to slowly corrode the surface of the metal substrate in the heating plate during the contact of up to several months. The corroded metal ions (nickel, chromium, etc.) will gradually migrate and dissolve into the surrounding aerosol-generating substrate, changing its chemical composition. In addition, the flavor molecules in the aerosol-generating substrate and the surface of the metal substrate may also undergo slow catalysis or oxidation reactions at room temperature, generating new substances. These processes occur "silently", and by the time the product reaches the consumer, the aerosol-generating substrate inside may not be in the same stable state as when it was originally formulated, seriously affecting the user's taste. The embodiments of the present application construct an isolation layer on the surface of the metal substrate of the heating plate, like a barrier, physically isolating the metal substrate from the aerosol-generating substrate, completely preventing the above-mentioned corrosion and migration processes, and ensuring the stability of the product during storage. When in use, the isolation layer quickly dissolves and disappears as the temperature rises during the initial start-up phase, completely not affecting the normal heating function of the heating plate and the aerosolization effect on the aerosol-generating substrate.

[0051] In some possible implementations, the thickness of the isolation layer is 5 μm to 20 μm. In this case, the thickness of the isolation layer ensures complete coverage of the micro-pores on the surface of the metal substrate in the heating plate, and good sealing of the heating plate. This thickness is sufficient to form a continuous and dense physical barrier at room temperature, effectively blocking the chemical corrosion and ion migration of the aerosol-generating substrate to the metal substrate, and ensuring shelf life stability. At the same time, the thickness is controlled at a low level, so that it can quickly dissolve at working temperature with little residue, avoiding affecting the composition of the aerosol-generating substrate or affecting the aerosol generation efficiency, and ensuring instant responsiveness and pure taste during use. In addition, this thickness range facilitates uniform coating through processes such as spraying and dipping, taking into account production feasibility and cost control. After the isolation layer dissolves, the content is small, and the effect on the taste of the aerosol is not great. Moreover, during the product design stage, the taste of the aerosol can be optimized through the design of the aerosol-generating substrate.

[0052] For example, the thickness of the isolation layer can be 5 μm, 8 μm, 10 μm, 12 μm, 14 μm, 15 μm, 16 μm, 18 μm, 20 μm, etc. typical but non-limiting arbitrary point values or interval values between any two point values.

[0053] In some embodiments, the metal substrate includes metal materials or metal alloys such as nickel, chromium, iron, etc.

[0054] In some possible implementations, the film-forming material is included in the isolation layer. In this case, the film-forming material is a framework material for building a continuous and stable basic isolation layer, ensuring barrier integrity.

[0055] In some possible implementations, at least one of the plasticizer, the solubilizer, and the film-forming material is included in the isolation layer. In this case, the isolation layer significantly improves the comprehensive performance by introducing a composite system of at least one of the plasticizer, the solubilizer, and the film-forming material. The film-forming material builds a continuous and stable basic isolation framework, ensuring barrier integrity; the plasticizer enhances the flexibility and adhesion of the isolation layer, adjusts the dissolution temperature, and avoids brittle fracture or peeling of the coating layer due to vibration or temperature change during the shelf life; and the solubilizer promotes uniform dispersion of the components, optimizes film-forming density, and at the same time, assists in rapid and complete melting of the isolation layer at the working temperature, avoiding the accumulation of residues.

[0056] In some possible implementations, the film-forming material includes at least one of gelatin, hydroxypropyl methyl cellulose, gum arabic, polyvinyl alcohol, pullulan, and methyl cellulose; these film-forming materials are all conducive to forming a dense and uniform-thickness isolation layer.

[0057] In some possible implementations, the plasticizer includes at least one of triethyl citrate, L-arabinose, glycerol, polyethylene glycol, sorbitol, and pullulan; these plasticizers can all enhance the flexibility and adhesion of the isolation layer, adjust the dissolution temperature, and avoid brittle fracture or peeling of the coating layer due to vibration or temperature change during the shelf life.

[0058] In some possible implementations, the solubilizer includes at least one of sodium alginate, Tween, propylene glycol, and β-cyclodextrin. These solubilizers can all optimize film-forming density, and at the same time, assist in rapid and complete melting of the isolation layer at the working temperature, avoiding the accumulation of residues.

[0059] In some possible implementations, in the isolation layer, the mass ratio of the film-forming material, the plasticizer, and the solubilizer is (5-30):(1-10):(1-10). In this case, a high proportion of the film-forming material (5-30 parts) ensures that the isolation layer has sufficient structural strength and continuity, and can form a stable and reliable physical barrier. A moderate proportion of the plasticizer (1-10 parts) effectively enhances the flexibility of the coating layer and the adhesion to the metal substrate, prevents cracking or peeling, and at the same time, avoids excessive softening or migration of the isolation layer due to excessive plasticizer. An appropriate amount of the solubilizer (1-10 parts) ensures rapid and complete melting at the working time. The three components synergistically work at this ratio, precisely balancing the mechanical integrity, processing adaptability, protective durability, and instantaneous performance of the isolation layer at the time of use, so that the shelf life isolation and the melting at the working time are both optimized.

[0060] Exemplarily, the mass ratio of the film-forming material, the plasticizer and the solubilizer in the isolation layer can be 5:1:1, 10:2:3, 15:3:5, 20:3:6, 25:5:6, 30:8:10, and the like, which are typical but non-limiting arbitrary point values or interval values between any two point values.

[0061] In some possible implementations, the isolation layer includes a first isolation layer arranged in abutment with the metal substrate, and a second isolation layer arranged on a surface of the first isolation layer away from the metal substrate; wherein the first isolation layer includes a film-forming material and a plasticizer; and the second isolation layer includes a film-forming material and a solubilizer. In this case, the layered composite structure realizes precise optimization of performance through functional layering, with the following significant advantages: the first isolation layer, with the film-forming material and the plasticizer as the core, directly abuts the metal substrate, preferentially ensuring excellent adhesion and flexibility, effectively buffering thermal stress and preventing interlayer peeling, and providing a stable foundation for core protection. The second isolation layer, with the film-forming material and the solubilizer as the dominant, directly faces the aerosol generating substrate environment, not only strengthening the compactness of the barrier to resist component penetration, but also using the solubilizer properties to ensure that the outer layer can rapidly and uniformly disintegrate and melt at the working temperature, thereby cooperating with the inner layer to achieve overall efficient ablation and avoid residue. The two layers work together to greatly improve the structural stability and durability of the shelf-life isolation layer, and optimize the completeness and response speed of melting during use, achieving the unity of protection reliability and aerosolization efficiency.

[0062] In some possible implementations, the first isolation layer includes gelatin, hydroxypropyl methyl cellulose and triethyl citrate in a mass ratio of (8-15):(2-10):(1-5). In this case, a high proportion of gelatin as a film-forming substrate provides excellent structural strength, continuity and initial adhesion to the metal substrate, ensuring the basic barrier integrity of the isolation layer; hydroxypropyl methyl cellulose as another film-forming agent complements the gelatin, enhancing the compactness, oil resistance and thermal stability of the coating, preventing brittleness that may occur when gelatin is used alone to form a film, and further optimizing the film-forming quality. Triethyl citrate as an efficient plasticizer precisely inserts between the molecular chains of gelatin and cellulose, effectively reducing their glass transition temperature, greatly enhancing the flexibility, ductility and long-term adhesion of the coating to the metal substrate, and avoiding cracks or peeling due to temperature fluctuations or mechanical stress during the shelf life.

[0063] In some possible implementations, the first isolation layer has a thickness of 8-15 μm. In this case, the thickness range is sufficient to ensure that the gelatin-hydroxypropyl methyl cellulose matrix forms a continuous defect-free dense film, effectively preventing the penetration and erosion of the metal substrate by the components of the aerosol generating substrate, and providing core protection for the system. At the same time, this moderate thickness ensures that it can be melted synchronously with the outer layer during operation, and will not delay the overall ablation response due to excessive accumulation, balancing the reliability of protection and the instantaneity during aerosolization.

[0064] For example, the thickness of the first isolation layer can be 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, or any interval value between any two point values.

[0065] In some possible implementations, the second isolation layer includes gelatin and sodium alginate in a mass ratio of (5-10):(1-6). In this case, the gelatin provides good film-forming property and compatibility with the first isolation layer, ensuring the interlayer bonding force. The sodium alginate significantly enhances the density and integrity of the outer layer film by virtue of its excellent hydrophilic film-forming property and higher thermal stability, and improves the barrier effect against the penetration of small molecular acidic substances or flavorants. At the same time, the introduction of sodium alginate may help to regulate the melting behavior of the isolation layer at the working temperature to some extent, so that it disintegrates more quickly and uniformly, and realizes complete ablation in cooperation with the inner layer, thereby guaranteeing the user experience.

[0066] In some possible implementations, the second isolation layer has a thickness of 3-8 μm. In this case, the thickness of the second isolation layer is sufficient to ensure that the gelatin-sodium alginate composite film forms a continuous, dense and complete protective layer, effectively preventing the penetration of acidic components and flavor molecules in the aerosol generating substrate, and strengthening the overall isolation effect. At the same time, the ultra-thin feature can ensure that it quickly reaches the melting temperature and completely disintegrates in an instant during heating, and almost no residue is left, thereby completely eliminating any potential negative impact on aerosol generation, aerosolization efficiency and the final taste, and realizing seamless switching from storage protection to use experience.

[0067] For example, the thickness of the second isolation layer can be 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, or any interval value between any two point values.

[0068] In some possible implementations, the isolation layer dissolves in no more than 30 seconds at temperatures between 45℃ and 60℃. This characteristic (dissolution time ≤30s at 45℃~60℃) is a core performance indicator ensuring the success of the technical solution: it ensures the isolation layer remains absolutely stable at room temperature during its shelf life, and rapidly and completely melts away within a very short time after the device is started (far from reaching the normal operating temperature of over 200℃). This rapid removal characteristic ensures that the heating element can enter a highly efficient working state without delay or obstruction. This perfectly solves the problem of corrosion and migration during storage, and achieves "zero interference" with heating rate, aerosolization efficiency, and taste purity during use, ultimately providing users with a stable and instantly responsive experience.

[0069] For example, the dissolution temperature of the isolation layer can be any typical but non-limiting point value or a range between any two points, such as 45℃, 46℃, 47℃, 48℃, 49℃, 50℃, 51℃, 52℃, 53℃, 54℃, 55℃, 56℃, 57℃, 58℃, 59℃, 60℃, etc., and the dissolution time can be any typical but non-limiting point value or a range between any two points, such as 5s, 10s, 15s, 20s, 25s, 30s, etc.

[0070] In some embodiments, when the aerosol generator is used for the first time, the device is started to preheat for about 30 seconds. After gently shaking the device to promote the dissolution of the isolation layer, it can be used normally.

[0071] The heating element described in the above embodiments of this application can be prepared by the methods described in the following embodiments.

[0072] Secondly, embodiments of this application provide a method for preparing a heating element, as shown in the attached figure. Figure 2 As shown, it includes the following steps: S10. Prepare the isolation slurry; S20. Obtain a metal substrate, form an isolation slurry layer on at least the surface of the working area of ​​the metal substrate, and cure it to form an isolation layer to obtain a heating element; wherein the melting temperature of the isolation layer is 45℃~60℃.

[0073] The preparation method of the heating sheet in the embodiments of the present application is as follows: after the isolation slurry is prepared, the isolation slurry is formed into an isolation slurry layer on the surface of the working area of the metal substrate, and is solidified to form an isolation layer. The isolation layer constructed on the surface of the metal substrate of the heating sheet physically isolates the metal substrate from the aerosol generating substrate, completely prevents the corrosion of the aerosol generating substrate on the metal substrate and the migration process of metal ions, and guarantees the storage stability of the heating sheet and the aerosol generating substrate. Even in long-term storage during the shelf life, the stability of the components of the aerosol generating substrate can be maintained, so that the stability of the taste of the aerosol and the original flavor can be maintained. In use, the isolation layer quickly melts and disappears as the temperature rises in the initial stage of starting, and does not affect the normal heating function of the heating sheet and the aerosolization effect on the aerosol generating substrate.

[0074] In the above step S10: In some possible implementations, the isolation slurry includes a film-forming material with a mass percentage of 5% to 30%, a plasticizer with a mass percentage of 0 to 10%, and a solubilizer with a mass percentage of 0 to 10%. In this case, the film-forming material ensures that the isolation layer has sufficient structural strength and continuity to form a stable and reliable physical barrier. The plasticizer effectively enhances the flexibility of the coating and the adhesion to the metal substrate, preventing cracking or peeling, while avoiding excessive softening or migration of the isolation layer caused by excessive plasticizer. The solubilizer ensures rapid and complete melting during operation.

[0075] For example, the mass percentage of the film-forming material in the isolation slurry can be 5%, 10%, 15%, 20%, 25%, 30%, or any point value or interval value between any two point values of the typical but non-limiting values; the mass percentage of the plasticizer can be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or any point value or interval value between any two point values of the typical but non-limiting values; and the mass percentage of the solubilizer can be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or any point value or interval value between any two point values of the typical but non-limiting values.

[0076] In some possible implementations, the film-forming material includes at least one of gelatin, hydroxypropyl methyl cellulose, arabic gel, polyvinyl alcohol, pullulan, and methyl cellulose; these film-forming materials are all conducive to forming a dense and uniform isolation layer.

[0077] In some possible implementations, the plasticizer includes at least one of triethyl citrate, L-arabinose, glycerol, polyethylene glycol, sorbitol, and pullulan; these plasticizers can all enhance the flexibility and adhesion of the isolation layer, adjust the dissolution temperature, and prevent the coating from cracking or peeling due to vibration or temperature changes during the shelf life.

[0078] In some possible implementations, the solubilizing agent includes at least one of sodium alginate, Tween, propylene glycol, and β-cyclodextrin. These solubilizing agents can all optimize the film-forming compactness, while assisting the rapid and complete melting of the isolation layer at the working temperature, avoiding the accumulation of residues.

[0079] In some embodiments, in the process of preparing the isolation slurry, the film-forming material is dissolved in ethanol and water in a volume ratio of (2-4):(6-8), and is dissolved in a water bath at 50-60°C with stirring, and is filtered (for example, 0.45 μm filter membrane) to avoid clogging the nozzle.

[0080] In the step S20 above: In some embodiments, the metal substrate includes a metal material or a metal alloy such as nickel, chromium, iron, etc.

[0081] In some possible implementations, after obtaining the metal substrate, a processing step of plasma cleaning the surface of the metal substrate is further included. The plasma cleaning removes stains such as oil stains on the surface of the metal substrate, so that the subsequent isolation layer is more easily attached to the film.

[0082] In some possible implementations, the conditions of the plasma cleaning include: under the conditions of a radio frequency power of 50-100 W, and a mixed gas of Ar and O2 in a volume ratio of (7-9):(1-3), processing for 90-120 s. Under these conditions, the surface of the metal substrate can be cleaned sufficiently and completely, and the subsequent adhesion and film-forming performance of the isolation slurry can be improved.

[0083] For example, the radio frequency power can be 50 W, 60 W, 70 W, 80 W, 90 W, 100 W, or any interval value between any two point values; the processing time can be 90 s, 95 s, 100 s, 105 s, 110 s, 115 s, 120 s, or any interval value between any two point values; and the volume ratio of Ar and O2 can be 7:3, 8:2, 9:1, or any interval value between any two point values.

[0084] In some possible implementation manners, the manner of forming the isolation paste into the isolation paste layer includes electrostatic spraying and / or dip drawing. The electrostatic spraying can make the charged gas aerosolized paste particles accurately and uniformly adsorbed on the surface of the metal heating substrate by the electric field force, and is particularly suitable for coating in local working areas of complex shapes (such as dense coils), and can realize high controllability of thickness and high material utilization rate. The dip drawing can regulate the amount of paste attached by accurately controlling the drawing speed, and the process is simple and stable, and is particularly suitable for batch coating of uniform and consistent coating on filamentous or sheet-shaped substrates. Both the two methods can efficiently realize thin-layer preparation of the isolation layer and perfectly maintain the functional formula of the isolation paste, and provide a reliable and economical technical path for large-scale production of high-performance isolation layers.

[0085] In some possible implementation manners, the conditions of the electrostatic spraying include that the voltage of the high-voltage generator is 8kV~12kV, the pulse frequency is 5kHz~10kHz, the nozzle aperture is 80μm~150μm, the flow rate is 2mL / min~5mL / min, and the constant-temperature liquid supply is 45℃~50℃. In this case, the charged gas aerosolized paste particles are accurately and uniformly adsorbed on the surface of the metal heating substrate, and are particularly suitable for coating in local working areas of complex shapes (such as dense coils), and can realize high controllability of thickness and high material utilization rate.

[0086] For example, the voltage of the high-voltage generator can be 8kV, 9kV, 10kV, 11kV, 12kV, or any interval value between any two point values, which are typical but not limited; the pulse frequency can be 5kHz, 6kHz, 7kHz, 8kHz, 9kHz, 10kHz, or any interval value between any two point values, which are typical but not limited; the nozzle aperture can be 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, or any interval value between any two point values, which are typical but not limited; the flow rate can be 2mL / min, 3mL / min, 4mL / min, 5mL / min, or any interval value between any two point values, which are typical but not limited; and the temperature can be 45℃, 46℃, 47℃, 48℃, 49℃, 50℃, or any interval value between any two point values, which are typical but not limited.

[0087] In some possible implementation manners, the processing manner of solidification includes ultraviolet light solidification. The isolation paste layer is solidified to form a stable isolation layer.

[0088] In some possible implementation manners, the power of the ultraviolet light solidification is 60mW / cm 2 ~120mW / cm 2 , and the time length is 10min~30min. In this case, the solidification efficiency of the isolation layer is improved.

[0089] For example, the power of the ultraviolet light curing can be 60 mW / cm 2 , 70 mW / cm 2 , 80 mW / cm 2 , 90 mW / cm 2 , 100 mW / cm 2 , 110 mW / cm 2 , 120 mW / cm 2 , etc. typical but non-limiting any point value or interval value between any two point values; the time length can be 10 min, 15 min, 20 min, 25 min, 30 min, etc. typical but non-limiting any point value or interval value between any two point values.

[0090] In some possible implementations, the thickness of the isolation layer formed is 5 μm to 20 μm. The thickness is sufficient to form a continuous and dense physical barrier at room temperature, effectively blocking the chemical corrosion and ion migration of the aerosol generating substrate to the metal substrate, ensuring shelf stability. At the same time, the thickness is controlled at a low level, so that it can be quickly melted at the working temperature and the residue is very little, avoiding affecting the composition of the aerosol generating substrate or affecting the aerosol generating efficiency, ensuring the instant responsiveness and pure taste when in use.

[0091] In some possible implementations, the isolation slurry includes a first isolation slurry including 8% to 15% by mass percentage of gelatin, 2% to 10% by mass percentage of hydroxypropyl methyl cellulose, and 1% to 5% by mass percentage of triethyl citrate, and a solvent. For example, the solvent can be ethanol and water in a volume ratio of (2 to 4):(6 to 8). The first isolation slurry is used to form a first isolation layer, i.e., an inner layer, which is arranged to fit the metal substrate. The first isolation layer takes the film-forming material and plasticizer as the core, directly fits the metal substrate, and preferentially ensures excellent adhesion and flexibility, effectively buffers thermal stress and prevents interlayer peeling, providing a stable foundation for core protection.

[0092] In some possible implementation manners, the isolation paste comprises a second isolation paste, and the second isolation paste comprises gelatin with a mass percentage of 5% to 10%, sodium alginate with a mass percentage of 1% to 6%, and a solvent. For example, the solvent can be ethanol and water in a volume ratio of (2 to 4) to (6 to 8). The second isolation layer, that is, the outer layer, is formed by the second isolation paste and is arranged away from the metal base material. The second isolation layer is dominated by the film-forming material and the solubilizing agent and directly faces the environment of the aerosol generating substrate. The second isolation layer not only strengthens the compactness of the barrier to resist the penetration of components, but also ensures that the outer layer can be rapidly and uniformly disintegrated and melted at a working temperature by using the solubilizing agent, so as to realize efficient ablation together with the inner layer and avoid residue. Through the first isolation layer and the second isolation layer, the two layers work together to greatly improve the structural stability and durability of the shelf-life isolation layer and optimize the completeness of melting and the response speed during use, thereby realizing the unity of protection reliability and aerosolization efficiency.

[0093] In a third aspect, an embodiment of the present application provides a heating assembly, comprising the heating sheet and / or the heating sheet prepared by the method.

[0094] The heating assembly provided by the embodiment of the present application successfully converts the advantages of the innovative structure at the single-layer level into reliable performance at the assembly level by integrating the heating sheet with the specific isolation layer (or using the heating sheet prepared by the method). The heating assembly can completely prevent the migration of metal ions and the deterioration of the components of the aerosol generating substrate during the shelf life, thereby ensuring the long-term stability and safety of the aerosol generating substrate. During operation, the rapid ablation of the isolation layer ensures that the heating efficiency, response speed and aerosolization effect of the heating assembly are the same as those of the traditional assembly without the isolation layer. Ultimately, the user can enjoy a pure taste and consistent quality.

[0095] In some embodiments, the heating assembly comprises a heating sheet, a liquid guide material, etc. The aerosol generating substrate in the liquid guide material is heated by the heating sheet to form an aerosol for the user to smoke.

[0096] In a fourth aspect, an embodiment of the present application provides an aerosol generating device, comprising a power assembly and the heating assembly.

[0097] The aerosol generating device provided by the embodiments of the present application integrates the power supply assembly and the heating assembly, realizes a leap in the overall performance of the product, completely eliminates the risk of metal ion migration and aerosol generating substrate deterioration during the shelf life of the aerosol generating device due to the physical barrier effect of the isolation layer in the heating assembly, and ensures the long-term stability of the factory quality. When the user starts the device, the isolation layer can be removed instantly by the power supply assembly, so that the device quickly enters the best working state and outputs aerosol with pure taste and consistent quality. This design fundamentally solves the industry problem of quality degradation caused by long-term storage and provides users with a perfect smoking experience that is safe, stable and reliable from the first use to the end.

[0098] To enable the above-mentioned implementation details and operations of the present application to be clearly understood by those skilled in the art, and to further demonstrate the significant performance of the heating sheet and its preparation method, the heating assembly and the aerosol generating device, the above technical solutions are illustrated by multiple embodiments as follows.

[0099] Embodiment 1 A heating sheet, comprising: a metal substrate being a nickel-chromium alloy heating mesh, and a gelatin isolation layer formed on the surface of the metal substrate, with a thickness of 15 μm.

[0100] The preparation thereof comprises the following steps: 1. Pretreatment of the metal substrate: plasma cleaning of the nickel-chromium alloy heating mesh, with the conditions being: 100 W radio frequency power, Ar / O2 mixed gas (8:2), and a treatment time of 120 seconds.

[0101] 2. Preparation of the isolation slurry: gelatin (pharmaceutical grade or food grade) is dissolved in deionized water at 8% (w / v), and stirred and dissolved in a 50°C water bath to avoid high-temperature long-time heating (to prevent degradation). After complete dissolution, impurities are removed by filtration (0.45 μm filter membrane) to avoid clogging of the nozzle, and the isolation slurry is prepared.

[0102] 3. Preparation of the isolation layer: the isolation slurry is sprayed onto the surface of the pretreated heating mesh by electrostatic spraying under the conditions of a high-voltage generator of 10 W kV, a pulse controller of 6 kHz, a nozzle aperture of 100 μm, a flow rate of 3 mL / min, and a temperature of 50°C constant temperature, until a 15 μm continuous film is formed on the surface of the heating mesh. UV intensity 90 mW / cm 2 UV curing under the conditions, with a curing time of 5 min, to form the isolation layer and obtain the heating sheet.

[0103] Embodiment 2 A heating sheet, comprising: a metal substrate being an iron-chromium-aluminum mesh, and a gelatin+HPMC isolation layer formed on the surface of the metal substrate, with a thickness of 15 μm.

[0104] The preparation thereof comprises the steps of: 1. Metal substrate pretreatment: Iron-chromium-aluminum mesh heating metal substrate (wire diameter 50 pm) is treated by two steps: alkaline degreasing (5% NaOH ultrasonic cleaning for 10 minutes); then, plasma activation (50 W, pure Ar gas, 60 seconds).

[0105] 2. Preparation of isolation paste: gelatin (pharmaceutical grade or food grade): 10% (w / v) is dissolved in deionized water in a 50°C water bath with stirring to avoid high-temperature long-time heating (to prevent degradation), and after complete dissolution, impurities are removed by filtration (0.45 pm filter membrane) to avoid clogging of the nozzle. 5wt% hydroxypropyl methyl cellulose (HPMC) is added to improve film formation, and the isolation paste is prepared.

[0106] 3. Isolation layer preparation: The isolation paste is sprayed onto the surface of the pretreated heating mesh by electrostatic spraying under the conditions of a high-voltage generator 10 WkV, a pulse controller 6 kHz, a nozzle diameter 100 pm, a flow rate 3 mL / min, and a temperature 50°C constant temperature, until a 15 pm continuous film is formed on the surface of the heating mesh. UV intensity 90 mW / cm 2 UV curing under the conditions of a UV intensity 90 mW / cm

[0107] Example 3 A heating sheet, comprising: a metal substrate of iron-chromium-aluminum mesh, a first isolation layer (inner layer) of gelatin + HPMC + plasticizer formed on the surface of the metal substrate, with a thickness of 10 pm; and a second isolation layer (outer layer) of gelatin + sodium alginate, with a thickness of 5 pm.

[0108] The preparation thereof comprises the steps of: 1. Metal substrate pretreatment: Iron-chromium-aluminum mesh heating body (wire diameter 50 pm) is treated by two steps: alkaline degreasing (5% NaOH ultrasonic cleaning for 10 minutes); then, plasma activation (50 W, pure Ar gas, 60 seconds).

[0109] 2. Preparation of isolation paste: Inner layer isolation paste: 10% gelatin + 5% HPMC + 1% triethyl citrate (plasticizer); Outer layer isolation paste: 6% gelatin + 3% sodium alginate (accelerated dissolution); The two solutions are divided into a multi-channel electrostatic spray gun and are ready for use.

[0110] 3. Isolation layer preparation: First inner layer isolation layer: the inner layer isolation paste is first sprayed (parameters same as in Example 1), forming a 10 pm continuous film; Second outer isolation layer: immediately switch to the outer isolation paste, and stack spray 5 μm (adjust the spray parameters to 8 kV and 3 mL / min); An isolation paste layer with a total film thickness of 15 μm is obtained, and after co-curing, a composite isolation layer is obtained. The first isolation layer and the second isolation layer exhibit gradient dissolution characteristics, and the outer second isolation layer has a dissolution time of <15 seconds at 50°C.

[0111] Example 4 A heating sheet, comprising: a metal substrate of iron-chromium-aluminum mesh, and an isolation layer (inner layer) of gelatin+HPMC+plasticizer+sodium alginate formed on the surface of the metal substrate, with a thickness of 15 μm.

[0112] The preparation thereof comprises the following steps: 1. Pretreatment of the metal substrate: the iron-chromium-aluminum mesh heating body (wire diameter 50 μm) is subjected to two-step treatment: alkaline degreasing (5% NaOH ultrasonic cleaning for 10 minutes); and then, plasma activation (50 W, pure Ar gas, 60 seconds).

[0113] 2. Preparation of the isolation paste: gelatin (pharmaceutical grade or food grade): 16% (w / v) is dissolved in deionized water in a 50°C water bath with stirring to avoid high-temperature long-time heating (to prevent degradation), and after complete dissolution, filtration (0.45 μm filter membrane) is performed to remove impurities and avoid clogging of the spray head. 5 wt% hydroxypropyl methylcellulose (HPMC), 1% triethyl citrate (plasticizer), and 3% sodium alginate (accelerate dissolution) are added to prepare the isolation paste.

[0114] 3. Preparation of the isolation layer: the isolation paste is sprayed onto the surface of the pretreated heating mesh under the following conditions: electrostatic spraying, high-voltage generator 10 W kV, pulse controller 6 kHz, spray head diameter 100 μm, flow rate 3 mL / min, and temperature 50°C constant temperature, until a 15 μm continuous film is formed on the surface of the heating mesh. UV intensity 90 mW / cm 2 UV curing under the above conditions, curing time 5 min, to form the isolation layer, and obtain the heating sheet.

[0115] Example 5 A heating sheet, which differs from Example 1 in that the thickness of the isolation layer forming the layer is different, and the thickness is 8 μm.

[0116] Example 6 A heating sheet, which differs from Example 1 in that the thickness of the isolation layer forming the layer is different, and the thickness is 20 μm.

[0117] Example 7 A heating sheet, which differs from Example 1 in that the film-forming material is different, and the film-forming material is pullulan.

[0118] Control group 1 The control group of the present application uses a metal substrate without a coating isolation layer as control example 1. Specifically, only the metal substrate is pretreated: the nickel-chromium alloy heating mesh is plasma cleaned, with a radio frequency power of 100 W, Ar / O2 mixed gas (8:2), and a treatment time of 120 seconds.

[0119] Control group 2 A heating sheet, comprising: a metal substrate is an iron-chromium-aluminum mesh, and an isolation layer of control example 2 is formed on the surface of the metal substrate, with a thickness of 15 μm. The dissolution temperature of the isolation layer of control example 2 is set to 35℃. In the case of a simulated ambient temperature of 40℃, the isolation layer dissolves.

[0120] The preparation thereof includes the following steps: 1. Metal substrate pretreatment: the nickel-chromium alloy heating mesh is plasma cleaned, with a radio frequency power of 100 W, Ar / O2 mixed gas (8:2), and a treatment time of 120 seconds.

[0121] 2. Isolation slurry preparation: gelatin 5% (W / V), glycerol 15%, hydroxypropyl methylcellulose (HPMC): 3% (w / v), sodium alginate: 1% (w / v), and the rest is made up with water to obtain the isolation slurry.

[0122] 3. Isolation layer preparation: electrostatic spraying is adopted. The parameters are adjusted as follows: high-voltage generator 8 kV (the viscosity of the formula may change due to high glycerol content, so the voltage is appropriately adjusted lower), pulse controller frequency 6 kHz, nozzle aperture 100 μm, flow rate 2.5 mL / min (the film forming efficiency of high plasticizer formula may be different, so the flow rate is fine-tuned), and the substrate table is kept at a constant temperature of 35℃ (to prevent the isolation layer from gelling too early on the cold substrate during spraying) to spray the above isolation slurry onto the surface of the pretreated heating mesh until a 15 μm continuous film is formed on the surface of the heating mesh. UV intensity 90 mW / cm 2 UV curing under the condition, with a curing time of 5 min, to form an isolation layer and obtain a heating sheet.

[0123] Control group 3 A heating sheet, comprising: a metal substrate is an iron-chromium-aluminum mesh, and an isolation layer of control example 3 is formed on the surface of the metal substrate, with a thickness of 15 μm. The dissolution temperature of the isolation layer of control example 3 is set to 70℃. In the case of a simulated ambient temperature of 70℃, the isolation layer dissolves.

[0124] The preparation thereof includes the following steps: 1. Metal substrate pretreatment: the nickel-chromium alloy heating mesh is plasma cleaned, with a radio frequency power of 100 W, Ar / O2 mixed gas (8:2), and a treatment time of 120 seconds.

[0125] 2. Isolation paste preparation: gelatin 14% (w / v), genipin 0.5% (w / v), the rest is deionized water. The gelatin powder is slowly added to the part of the room temperature deionized water under stirring, and is fully swelled. The remaining water is heated to 80℃, and the gelatin paste is added to the hot water under continuous stirring until it is completely dissolved to form a clear solution. The solution is cooled to below 37℃, and the genipin powder is added under slow stirring, and the stirring is continued for at least 2 hours to ensure that it is completely dissolved and starts to pre-crosslink. The genipin dissolves slowly, and needs to be stirred patiently. Finally, the paste is filtered using a 0.45 μm filter membrane.

[0126] 3. Isolation layer preparation: electrostatic spraying is used, and the parameters need to be adjusted: high voltage generator 12 kV, pulse controller frequency 6 kHz, nozzle diameter 100 μm, flow rate 2.0 mL / min, and substrate table constant temperature 40℃. After the spraying is completed, the heating sheet coated with the wet film is placed in a constant temperature and humidity box at 60℃ and 80% humidity for heat treatment for 12 hours, and finally an isolation layer with a thickness of about 15 μm is formed, and the heating sheet is obtained.

[0127] In order to verify the progressiveness of the embodiments of the present application, the above-mentioned embodiments and comparative examples are respectively subjected to the following performance tests: 1. The dissolution performance of the isolation layer in the heating sheet prepared in each embodiment and the control group is respectively tested, and the test results are shown in Table 1 below:

[0128] From the above test results, it can be seen that the isolation layer in the heating sheet prepared in the embodiments of the present application is dissolved for not more than 30s under the condition that the temperature is 45℃~60℃. The dissolution temperature of the isolation layer prepared in Comparative Example 2 is too low, only 35℃, and there is a risk of dissolution during the shelf life of the heating sheet. The dissolution temperature of the isolation layer prepared in Comparative Example 3 is as high as 70℃, and in the same equipment, because the dissolution temperature of the heating sheet is high, a longer preheating time is needed to reach the temperature of the dissolution of the isolation layer under the same preheating temperature, and even due to heat conduction, a higher local temperature cannot be reached in the low-power preheating program, which affects the normal use of the heating sheet.

[0129] 2. The heating sheets of each embodiment and the control group are respectively applied to the same aerosol generating device to explore the influence of the heating sheet on the aerosol: Twenty trained sensory evaluation personnel who are familiar with aerosol generating device products and can accurately describe indicators such as flavor and stimulation, and have no olfactory / gustatory disorders are selected, and the aerosol generated by the aerosol generating device to which the heating sheet of each embodiment and the comparative example is applied is subjected to sensory evaluation, and the evaluation indicators and scales are shown in Table 2 below, and a 5-point scoring system (1=extremely poor, 5=extremely good) and descriptive analysis are used:

[0130] Test procedure: Pre-treatment: All test samples were aged under the same condition (40°C / 75%RH, 90 days shelf life simulation).

[0131] Blind test design: Each group of samples was randomly numbered, and the evaluator was unaware of the sample differences.

[0132] The sensory evaluator rinsed his mouth before the test to avoid food interference. After testing each sample, he rinsed his mouth with clean water and waited for 5 minutes.

[0133] Data recording: Fill in the structured questionnaire (including scoring + written description). Record abnormal feedback (such as cough, sore throat).

[0134] Data analysis: Statistical method, variance analysis (ANOVA): compare the significance of differences between groups (p<0.05).

[0135] Principal component analysis (PCA): correlate flavor indicators with formula variables.

[0136] The above sensory score results are shown in Table 3 as follows:

[0137] From the above test results, compared with the control group 1 without the isolation layer, the aerosol generating device to which the heating sheet of the application is applied has a high aerosol amount, a strong throat-kicking feeling, a high atmosphere restoration degree, a small metal odor, a high aftertaste freshness, and a high overall acceptance. The dissolution temperature of the isolation layer in Comparative Example 2 is too low, which easily decomposes and increases the metal odor, reduces the aftertaste freshness of the aerosol and the overall acceptance. The dissolution temperature of the isolation layer in Comparative Example 3 is too high, which affects the working efficiency of the heating sheet, reduces the aerosol amount, reduces the throat-kicking feeling, and reduces the flavor restoration degree, the aftertaste freshness, and the overall acceptance. It is shown that the application constructs an isolation layer with a dissolution temperature of 45°C to 60°C on the surface of the metal substrate of the heating sheet, which physically isolates the metal substrate from the aerosol generating substrate, completely prevents the metal corrosion and metal ion migration process, and ensures the stability of the product during storage. Even in long-term storage during the shelf life, the stability of the components of the aerosol generating substrate can be maintained, thereby maintaining the stability of the aerosol taste and the original flavor. With the rising of the initial stage temperature of the aerosol generating device, the isolation layer quickly dissolves, which does not affect the normal heating function of the heating sheet and the aerosolization effect on the aerosol generating substrate. The problem of component degradation and taste degradation caused by the reaction and corrosion of the metal of the heating sheet and the aerosol generating substrate is fundamentally solved.

[0138] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A heat generating sheet, characterized by, The isolation layer includes a metal base and at least covers the working area surface of the metal base, and the dissolution temperature of the isolation layer is 45-60 DEG C.

2. The heat generating sheet according to claim 1, wherein The thickness of the isolation layer is 5-20 microns.

3. The heat generating sheet according to claim 1 or 2, wherein The isolation layer includes a film-forming material; Or, the isolation layer includes at least one of a plasticizer, a solubilizer and a film-forming material.

4. The heat generating sheet according to claim 3, wherein The film-forming material includes at least one of gelatin, hydroxypropyl methyl cellulose, arabic gel, polyvinyl alcohol, pullulan, methyl cellulose; And / or, the plasticizer includes at least one of triethyl citrate, L-arabinose, glycerol, polyethylene glycol, sorbitol, and prussian polysaccharide; And / or, the solubilizer includes at least one of sodium alginate, Tween, propylene glycol, and beta-cyclodextrin.

5. The heat generating sheet according to claim 3, wherein In the isolation layer, the mass ratio of the film-forming material, the plasticizer and the solubilizer is (5-30):(1-10):(1-10).

6. The heat generating sheet according to claim 3, wherein The isolation layer includes a first isolation layer arranged in contact with the metal base, and a second isolation layer arranged on the surface of the first isolation layer away from the metal base; wherein the first isolation layer includes the film-forming material and the plasticizer; the second isolation layer includes the film-forming material and the solubilizer.

7. The heat generating sheet according to claim 6, wherein In the first isolation layer, the mass ratio of gelatin, hydroxypropyl methyl cellulose and triethyl citrate is (8-15):(2-10):(1-5); And / or, the thickness of the first isolation layer is 8-15 microns; And / or, in the second isolation layer, the mass ratio of gelatin and sodium alginate is (5-10):(1-6); And / or, the thickness of the second isolation layer is 3-8 microns.

8. The heat generating sheet according to any one of claims 1 to 2, 4 to 7, wherein The isolation layer is dissolved for no more than 30 seconds at a temperature of 45-60 DEG C.

9. A method of producing a heat generating sheet, characterized by, The method includes the following steps: Preparation of isolation slurry; Obtaining a metal base, forming an isolation slurry layer on the surface of the working area of the metal base with the isolation slurry, curing to form an isolation layer, and obtaining a heating sheet; wherein the dissolution temperature of the isolation layer is 45-60 DEG C.

10. The method for preparing the heating element as described in claim 9, characterized in that, In the isolation slurry, the mass percentage of the film-forming material is 5-30%, the mass percentage of the plasticizer is 0-10%, and the mass percentage of the solubilizer is 0-10%; And / or, the thickness of the isolation layer formed is 5-20 microns.

11. The method for preparing the heating element as described in claim 9 or 10, characterized in that, After obtaining the metal base, the method further includes a treatment step of plasma cleaning the surface of the metal base; And / or, the method of forming the isolation slurry layer includes electrostatic spraying and / or immersion lifting; And / or, the curing treatment method includes ultraviolet curing.

12. The method for preparing the heating element as described in claim 11, characterized in that, The plasma cleaning conditions include: under the conditions of an RF power of 50-100 W and a volume ratio of (7-9):(1-3) of Ar and O2 mixed gas, processing for 90-120 s. And / or, the electrostatic spraying conditions include: the high-voltage generator voltage is 8kV~12kV, the pulse frequency is 5kHz~10kHz, the nozzle caliber is 80μm~150μm, the flow rate is 2mL / min~5mL / min, and the constant-temperature liquid supply temperature is 45℃~50℃; and / or the power of the ultraviolet light is 60 mW / cm 2 120 mW / cm 2 for 10 min to 30 min.

13. A heat generating component, characterized by The heat-generating sheet comprises the heat-generating sheet according to any one of claims 1-8 and / or the heat-generating sheet prepared by the method according to any one of claims 9-12.

14. An aerosol-generating device comprising: The heat-generating assembly comprises the power supply assembly and the heat-generating assembly according to claim 13.

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