Aerosol-generating article comprising ordered aerosol-generating substrate having coating layer and method of making same

Abstract

The invention discloses an aerosol generating product containing an ordered aerosol generating substrate with a coating layer and a preparation method of the aerosol generating product. The aerosol generating product comprises outer wrapping paper (1), and the aerosol generating substrate (2), a supporting piece (3), a composite cooling filtering piece (4) and an end cavity piece (5) which are positioned in the outer wrapping paper (1), the aerosol generating matrix (2) is reconstituted tobacco shreds arranged in order, and each reconstituted tobacco shred comprises a reconstituted tobacco shred body and a coating layer wrapping the outer surface of the reconstituted tobacco shred body. According to the method, the surface of the reconstituted tobacco is coated, and the coating layer on the surface of the reconstituted tobacco can improve the physical strength of the reconstituted shredded tobacco from multiple aspects, so that the problems that the filling amount of the reconstituted shredded tobacco is difficult to control, the reconstituted shredded tobacco is sticky after absorbing moisture, the stiffness becomes low, and an ordered tobacco core rod becomes soft are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat-not-burn cigarettes, and in particular to an aerosol-generating product comprising an ordered aerosol-generating matrix having a coating layer and a preparation method thereof. Background Art

[0002] As consumers pay more attention to health issues and demand for personalized experience of cigarette products, the tobacco industry continues to respond to the upgrading of consumer demand and develop various smoking products with tar reduction and harm reduction. Heat-not-burn cigarettes, as a new type of tobacco product, have received extensive attention and research in the tobacco industry in recent years. The core lies in the core segment, which produces aroma and smoke through heating, directly determining the style characteristics and quality of heated cigarettes. Therefore, the molding method of the core segment has become one of the research hotspots.

[0003] At present, in addition to granular heat-not-burn cigarettes, there are two other ways to form the core segments of heated cigarettes: ordered processing and disordered processing. The ordered processing mainly involves preparing reconstituted tobacco leaf slices first, absorbing smoke-generating agents and drying them, and then cutting them into reconstituted tobacco leaf shreds of a certain width and gathering them together to form them. The disordered processing is to mix reconstituted tobacco and natural tobacco raw materials into shreds, absorb smoke-generating agents and dry them, and then use the modified traditional rolling and splicing unit for rolling and splicing. Although the ordered and disordered processing technologies have higher flexibility and adaptability, they also face many technical difficulties.

[0004] First, the physical strength of the reconstituted tobacco leaf slices in the orderly processing technology will be significantly reduced after absorbing the smoke-generating agent, and the reconstituted tobacco leaf slices will become soft. In addition, during the preparation and storage of the reconstituted tobacco leaf slices, the smoke-generating agent inside the reconstituted tobacco leaf slices is also easy to seep out to the surface of the reconstituted tobacco leaf slices, or when the ambient humidity is high, the reconstituted tobacco leaf slices are easy to absorb moisture in the air. These problems will cause the physical strength to be significantly reduced and the reconstituted tobacco leaf slices to become soft. The reduction in the physical strength of the reconstituted tobacco leaf slices will make it difficult to control the filling amount of the reconstituted tobacco leaf shreds after subsequent shredding. If the filling amount is too small, the tobacco core segment will appear too soft, affecting the smoking experience; if the filling amount is too large, the tobacco shreds will be filled too tightly, increasing the inhalation resistance, and also affecting the smoking effect. Under the quantitative gram weight condition, the stiffness of the tobacco core rod is poor.

[0005] Secondly, the smoke-generating agent inside the reconstructed tobacco shreds seeps out to the surface of the reconstructed tobacco shreds, or when the ambient humidity is high, the reconstructed tobacco shreds absorb moisture from the air, which will cause the surface of the reconstructed tobacco shreds to become damp, causing adhesion between the shreds, affecting the orderly gathering process. In addition, the reconstructed tobacco shreds absorb moisture from the air, which will also cause the amount of smoke from the reconstructed tobacco shreds to decrease and increase the smoke temperature.

[0006] Finally, during the storage and transportation of reconstituted tobacco shreds, the smoke-generating agent easily seeps onto the surface of cigarette paper, forming yellow spots. This not only affects the aesthetics of cigarettes, but may also have an adverse effect on the taste of cigarettes. In order to solve this problem, it is usually necessary to set a separate anti-seepage layer on the inside of the cigarette paper, which undoubtedly increases the production cost and process complexity. In addition, during the storage and transportation of reconstituted tobacco shreds, the internal effective ingredients (such as smoke-generating agents, aroma components, etc.) will also have the problem of volatilization and loss, resulting in a short shelf life and a decrease in quality after being loaded into aerosol-generating products.

[0007] Therefore, developing a new method for forming heated cigarette core segments that can not only maintain the stable physical strength of reconstituted tobacco shreds but also effectively prevent the extravasation of smoke-generating agents is of great significance for improving the quality and smoking experience of heated cigarettes.

[0008] In order to solve the above problems, the present invention is proposed. Summary of the invention

[0009] In view of the above shortcomings, the present invention proposes an aerosol generating product including an ordered aerosol generating matrix with a coating layer and a preparation method thereof, wherein the aerosol generating product includes an outer wrapping paper 1, and an aerosol generating matrix 2, a supporting member 3, a composite cooling filter 4 and an end cavity 5 located in the outer wrapping paper 1; the aerosol generating matrix 2 is orderly arranged reconstituted tobacco shreds, and the reconstituted tobacco shreds include a reconstituted tobacco shreds body and a coating layer coated on the outer surface of the reconstituted tobacco shreds body. The present invention coats the surface of the reconstituted tobacco shreds obtained by mixing reconstituted tobacco and natural tobacco raw materials, and the coating layer on the surface of the reconstituted tobacco shreds can improve the physical strength of the reconstituted tobacco shreds from multiple aspects, thereby solving the problem that the filling amount of the reconstituted tobacco shreds is difficult to control, the reconstituted tobacco shreds become sticky after absorbing moisture, and the stiffness becomes low, resulting in the softening of the ordered cigarette core rod.

[0010] In a first aspect, the present invention provides an aerosol-generating article comprising an ordered aerosol-generating substrate having a coating layer, comprising an outer wrapping paper 1, and an aerosol-generating substrate 2, a support member 3, a composite cooling filter member 4 and an end cavity member 5 located in the outer wrapping paper 1;

[0011] The composite cooling filter element 4 comprises a hollow cooling element 41 and a filter element 42, and the outer sides of the hollow cooling element 41 and the filter element 42 are wrapped with a molding paper 43; the outer wrapping paper 1 outside the composite cooling filter element 4 and the end cavity element 5 is wrapped with a tipping paper 6;

[0012] The aerosol generating substrate 2 has cigarette paper 21 on the outside;

[0013] The aerosol generating matrix 2 is orderly arranged reconstituted tobacco shreds, and the reconstituted tobacco shreds include a reconstituted tobacco shred main body and a coating layer coated on the outer surface of the reconstituted tobacco shred main body.

[0014] Preferably, the end cavity member 5 has one or more cavities;

[0015] When there is one cavity, the cavity is located at the central axis, and when there are multiple cavities, the cavities are dispersed in the end cavity member 5;

[0016] The end cavity member 5 is an acetate fiber bundle tube, a paper tube or a non-woven fabric tube;

[0017] The axial length of the end cavity part 5 is one to two times the diameter of the end cavity part 5 .

[0018] Preferably, the hollow cooling component 41 has ventilation holes penetrating the tipping paper 6 , the outer wrapping paper 1 , the shaping paper 43 and the tube wall of the hollow cooling component 41 .

[0019] Preferably, the hollow cooling element 41 is a hollow acetate fiber bundle tube, a hollow paper tube or a hollow non-woven fabric tube, and the wall thickness of the hollow cooling element 41 is 0.2-1.2 mm.

[0020] The support member 3 of the present invention can be selected from any conventional support member form used for aerosol generating products in the art, and it can be an ordinary tube with a hollow structure, such as a hollow acetate fiber bundle tube, a hollow paper tube or a hollow non-woven fabric tube. It can also be a support member with a grooved corrugated layer as a tube wall. The support member 3 can determine whether to add a flavoring or smoking component according to actual conditions. The flavoring or smoking component can be in the form of directly setting a flavoring material layer or a smoking material layer on the tube wall, or adding a flavoring material or a smoking material in the tube cavity of the support section. Flavoring materials include natural fragrance raw materials and tobacco extracts, and smoking materials include propylene glycol and glycerol.

[0021] The filter element 42 of the present invention is acetate fiber tow.

[0022] Preferably, the material of the coating layer includes ethyl cellulose, shellac and carnauba wax.

[0023] Preferably, the mass of the coating layer accounts for 5-30% of the mass of the reconstituted tobacco shreds.

[0024] The second aspect of the present invention provides a method for preparing an aerosol-generating article comprising an ordered aerosol-generating substrate having a coating layer according to the first aspect of the present invention, comprising the following steps:

[0025] S1, preparing reconstituted tobacco leaf sheets;

[0026] S2, applying functional additives to the reconstituted tobacco leaf sheet obtained in step S1, and drying the same; the functional additives include smoke generating agents, flavors, tobacco extracts, adhesives, etc.;

[0027] S3, preparing a coating material mixture;

[0028] S4, spraying the coating material mixture obtained in step S3 onto both sides of the reconstituted tobacco leaf slice obtained in step S2;

[0029] S5, after the coating is completed, the reconstituted tobacco leaf slice with the coating material is dried to solidify the coating layer and tightly adhere to the reconstituted tobacco leaf slice to obtain a reconstituted tobacco leaf slice with a coating layer;

[0030] S6, rolling: rolling the reconstituted tobacco leaf slices obtained in step S5 and putting them into a sealed bag for later use;

[0031] S7, shredding, gathering and compounding: taking the rolled reconstituted tobacco leaf slices obtained in step S6 and shredding them to obtain reconstituted tobacco leaf shreds with a coating layer, wherein the reconstituted tobacco leaf shreds include a reconstituted tobacco leaf shred body and a coating layer coated on the outer surface of the reconstituted tobacco leaf shred body;

[0032] Then, the obtained reconstituted tobacco shreds with a coating layer are gathered in an orderly manner using cigarette paper 21 to obtain an aerosol generating matrix 2, and the hollow cooling component 41 and the filter component 42 are compounded using the forming paper 43 using a compounding machine to obtain the composite cooling filter component 4, and then the aerosol generating matrix 2, the support component 3, the composite cooling filter component 4 and the end cavity component 5 are compounded using the outer wrapping paper 1 using a compounding machine, and finally, the outer wrapping paper 1 on the outside of the composite cooling filter component 4 and the end cavity component 5 is wrapped with the tipping paper 6 to obtain an aerosol generating product.

[0033] Preferably, in step S3, the method for preparing the coating material is: adding the main body of the coating material into the solvent and stirring to prepare a coating material mixed solution with a mass concentration of 4-15%;

[0034] The coating material includes but is not limited to ethyl cellulose, shellac, carnauba wax, and the solvent includes alcohols, such as anhydrous ethanol.

[0035] Preferably, in step S5, the drying conditions after coating are completed include placing in an oven for drying, or air-drying with dry air. The drying conditions in the oven are: placing in an oven at 45-60°C and baking for 5-10 minutes; the dry air drying conditions are: air-drying with dry air at 45-60°C for 5-10 minutes.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The present invention coats the surface of the reconstituted tobacco leaf slices. After the reconstituted tobacco leaf slices are subsequently cut into reconstituted tobacco leaf shreds, the coating layer on the surface of the reconstituted tobacco leaf shreds can improve the physical strength of the reconstituted tobacco leaf shreds from three aspects. First, the present invention coats the reconstituted tobacco leaf shreds with the coating layer after the reconstituted tobacco leaf shreds absorb the smoke-generating agent and dry them. The coating layer can improve the physical strength of the reconstituted tobacco leaf shreds and prevent the reconstituted tobacco leaf shreds from becoming soft after absorbing the smoke-generating agent. Second, the coating layer prevents the smoke-generating agent (only the smoke-generating agent is used as an example, and also includes flavors, tobacco extracts, adhesives, etc.) inside the reconstituted tobacco leaf shreds from infiltrating onto the surface of the reconstituted tobacco leaf shreds. Third, the coating layer can effectively prevent the passage of moisture in the air, isolate the internal reconstituted tobacco leaf shreds from the outside world, and effectively reduce the hygroscopicity of the reconstituted tobacco leaf shreds. The problem of decreased physical strength of reconstituted tobacco shreds is avoided from three aspects, thereby solving the problem of difficult control of the filling amount of reconstituted tobacco shreds. Under the condition of quantitative gram weight, the stiffness of the cigarette core rod is guaranteed, thus avoiding the problem of softening of the ordered cigarette core rod due to low stiffness.

[0038] 2. The coating layer on the surface of the reconstituted tobacco shreds of the present invention can prevent the reconstituted tobacco shreds from becoming sticky after absorbing moisture, avoid adhesion between shreds, and ensure smooth orderly gathering. In addition, the reconstituted tobacco shreds are prevented from absorbing moisture in the air, and the problem of a decrease in smoke volume and an increase in smoke temperature of the reconstituted tobacco shreds is also avoided.

[0039] 3. The coating layer on the surface of the reconstituted tobacco shreds of the present invention can prevent the smoke-generating agent inside the reconstituted tobacco shreds from seeping out to the surface of the reconstituted tobacco shreds, and also avoids the problem of yellow spots caused by the smoke-generating agent seeping out to the cigarette paper. There is no need to set an anti-seepage layer on the cigarette paper, thereby reducing the requirements for cigarette paper.

[0040] 4. The coating layer on the surface of the reconstituted tobacco shreds of the present invention can also play a role in locking the internal components of the reconstituted tobacco shreds (such as smoke-generating agents, aroma components, etc.), thereby preventing the internal components of the reconstituted tobacco shreds from volatilizing and dissipating during storage.

[0041] 5. The coating material of the present invention is selected from ethyl cellulose. The coating layer formed by the material can not only effectively prevent the passage of moisture, but also has a certain air permeability. Therefore, when the reconstituted tobacco shreds are heated to generate aerosols, the aerosols can still smoothly pass through the coating layer and be gradually released, without affecting the smoke generation of the reconstituted tobacco shreds themselves.

[0042] 6. The amount of coating material used in the present invention and the preparation conditions during the coating process ensure the uniformity of the coating. The amount and uniformity of the coating also have a great influence on the volatility. If the amount of the coating is too large or the coating is uneven, the release of volatile substances may be hindered. However, the appropriate amount and uniformity of the coating can ensure that the volatile substances can pass through the coating smoothly when heated.

[0043] 7. The present invention arranges an end cavity member downstream of the filter member. The end cavity member extends the distance from the aerosol generating matrix section to the mouth end. Therefore, the temperature of the outer surface of the end cavity member is lower than that of the filter member surface, thereby avoiding the problem of the mouth end surface of the aerosol generating product being hot.

[0044] 8. The end cavity of the present invention has a hollow air flow channel inside, which has a small interception of smoke, so the smoke stays in the end cavity for a short time, which prevents the smoke from transferring heat to the outer surface, thereby further avoiding the problem of the mouth end surface of the aerosol generating product being hot. At the same time, since the end cavity has a small interception of smoke, the arrangement of the end cavity downstream of the filter will not significantly increase the inhalation resistance.

[0045] 9. The end cavity member of the present invention is a hollow acetate fiber bundle tube, a hollow paper tube or a hollow non-woven fabric tube. Since the interior thereof is hollow, the material area in contact with the consumer's oral cavity is reduced, thereby alleviating the consumer's safety concerns.

[0046] 10. In terms of preparation method, the present invention first uses a compounding machine to use the molding paper 43 to compound the hollow cooling element 41 and the filter element 42 to obtain the composite cooling filter element 4, and then uses a compounding machine to use the outer wrapping paper 1 to compound the aerosol generating matrix 2, the support element 3, the composite cooling filter element 4 and the end cavity element 5. The present invention can prepare a five-component aerosol generating product without changing the original four-component compounding equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the structure of an aerosol-generating article comprising an ordered aerosol-generating matrix having a coating layer.

[0048] Names of the reference numerals in the description of the drawings: 1-outer wrapping paper, 2-aerosol generating matrix, 3-support member, 4-composite cooling filter member, 5-end cavity member, 6-tip paper;

[0049] 21-cigarette paper, 41-hollow cooling element, 42-filter element, 43-forming paper. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with embodiments.

[0051] Those skilled in the art will appreciate that the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or the product specifications are used. If the manufacturer of the materials or equipment used is not specified, they are all conventional products that can be purchased.

[0052] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it may be directly connected to the other element, or there may be intermediate elements. In addition, the "connection" used herein may include wireless connections.

[0053] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two. The terms "inside", "upper", "lower", etc., indicating positions or state relationships, are based on the positions or state relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operate in a specific position, and therefore cannot be understood as limiting the present invention.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0055] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0056] Example 1

[0057] like Figure 1 As shown, this embodiment provides an aerosol generating product comprising an ordered aerosol generating substrate having a coating layer, which comprises an outer wrapping paper 1, and an aerosol generating substrate 2, a support member 3, a composite cooling filter member 4 and an end cavity member 5 located in the outer wrapping paper 1;

[0058] The composite cooling filter element 4 comprises a hollow cooling element 41 and a filter element 42, and the outer sides of the hollow cooling element 41 and the filter element 42 are wrapped with a molding paper 43; the outer wrapping paper 1 outside the composite cooling filter element 4 and the end cavity element 5 is wrapped with a tipping paper 6;

[0059] The aerosol generating substrate 2 has cigarette paper 21 on the outside;

[0060] The aerosol generating matrix 2 is orderly arranged reconstituted tobacco shreds, and the reconstituted tobacco shreds include a reconstituted tobacco shred main body and a coating layer coated on the outer surface of the reconstituted tobacco shred main body.

[0061] Preferably, the end cavity member 5 has one or more cavities;

[0062] When there is one cavity, the cavity is located at the central axis, and when there are multiple cavities, the cavities are dispersed in the end cavity member 5;

[0063] The end cavity member 5 is an acetate fiber bundle tube, a paper tube or a non-woven fabric tube;

[0064] The axial length of the end cavity part 5 is one to two times the diameter of the end cavity part 5 .

[0065] The hollow cooling element 41 is a hollow acetate fiber bundle tube, and the wall thickness of the hollow cooling element 41 is 1.0 mm.

[0066] In this embodiment, the support member 3 is a hollow paper tube.

[0067] The filter element 42 in this embodiment is acetate fiber tow.

[0068] The material of the coating layer includes ethyl cellulose.

[0069] The mass of the coating layer accounts for 5% of the mass of the reconstituted tobacco shreds.

[0070] The method for preparing an aerosol-generating article comprising an ordered aerosol-generating substrate having a coating layer comprises the following steps:

[0071] S1, preparing reconstituted tobacco leaf sheets;

[0072] S2, applying functional additives to the reconstituted tobacco leaf sheet obtained in step S1, and drying the same; the functional additives include smoke generating agents, flavors, tobacco extracts, and adhesives;

[0073] S3, preparing a coating material mixture;

[0074] S4, spraying the coating material mixture obtained in step S3 onto both sides of the reconstituted tobacco leaf slice obtained in step S2;

[0075] S5, after the coating is completed, the reconstituted tobacco leaf slice with the coating material is dried to solidify the coating layer and tightly adhere to the reconstituted tobacco leaf slice to obtain a reconstituted tobacco leaf slice with a coating layer;

[0076] S6, rolling: rolling the reconstituted tobacco leaf slices obtained in step S5 and putting them into a sealed bag for later use;

[0077] S7, shredding, gathering and compounding: taking the rolled reconstituted tobacco leaf slices obtained in step S6 and shredding them to obtain reconstituted tobacco leaf shreds with a coating layer, wherein the reconstituted tobacco leaf shreds include a reconstituted tobacco leaf shred body and a coating layer coated on the outer surface of the reconstituted tobacco leaf shred body;

[0078] Then, the obtained reconstituted tobacco shreds with a coating layer are gathered in an orderly manner using cigarette paper 21 to obtain an aerosol generating matrix 2, and the hollow cooling component 41 and the filter component 42 are compounded using the forming paper 43 using a compounding machine to obtain the composite cooling filter component 4, and then the aerosol generating matrix 2, the support component 3, the composite cooling filter component 4 and the end cavity component 5 are compounded using the outer wrapping paper 1 using a compounding machine, and finally, the outer wrapping paper 1 on the outside of the composite cooling filter component 4 and the end cavity component 5 is wrapped with the tipping paper 6 to obtain an aerosol generating product.

[0079] In step S3, the method for preparing the coating material is: adding the main body of the coating material into the solvent and stirring to prepare a coating material mixed solution with a mass concentration of 5%;

[0080] The coating material mainly comprises ethyl cellulose, and the solvent comprises anhydrous ethanol.

[0081] In step S5, after coating is completed, the drying conditions include placing it in an oven for drying, or air-drying it with dry air. The drying conditions in the oven are: placing it in an oven at 60°C and baking it for 5 minutes; the dry air drying conditions are: air-drying it with dry air at 60°C for 5 minutes.

Claims

1. An aerosol-generating article comprising an ordered aerosol-generating substrate having a coating layer, characterized in that It comprises an outer wrapping paper (1), and an aerosol generating matrix (2), a supporting member (3), a composite cooling filter member (4) and an end cavity member (5) located inside the outer wrapping paper (1); The composite cooling filter element (4) comprises a hollow cooling element (41) and a filter element (42), wherein the outer sides of the hollow cooling element (41) and the filter element (42) are wrapped with molding paper (43); the outer wrapping paper (1) on the outer sides of the composite cooling filter element (4) and the end cavity element (5) is wrapped with tipping paper (6); The aerosol generating substrate (2) has cigarette paper (21) on the outside; The aerosol generating matrix (2) is orderly arranged reconstituted tobacco shreds, and the reconstituted tobacco shreds include a reconstituted tobacco shred main body and a coating layer coated on the outer surface of the reconstituted tobacco shred main body.

2. An aerosol-generating article comprising an ordered aerosol-generating substrate having a coating layer according to claim 1, characterized in that The end cavity member (5) has one or more cavities; When there is one cavity, the cavity is located at the central axis; when there are multiple cavities, the cavities are dispersed in the end cavity member (5); The end cavity member (5) is an acetate fiber bundle tube, a paper tube or a non-woven fabric tube; The axial length of the end cavity part (5) is one to two times the diameter of the end cavity part (5).

3. An aerosol-generating article comprising an ordered aerosol-generating substrate having a coating layer according to claim 1, characterized in that The hollow cooling element (41) has a ventilation hole which penetrates the tipping paper (6), the outer wrapping paper (1), the shaping paper (43) and the tube wall of the hollow cooling element (41).

4. An aerosol-generating article comprising an ordered aerosol-generating substrate having a coating layer according to claim 1, characterized in that The hollow cooling element (41) is a hollow acetate fiber bundle tube, a hollow paper tube or a hollow non-woven fabric tube, and the wall thickness of the hollow cooling element (41) is 0.2-1.2 mm.

5. An aerosol-generating article comprising an ordered aerosol-generating substrate having a coating layer according to claim 1, characterized in that The materials of the coating layer include ethyl cellulose, shellac and carnauba wax.

6. An aerosol-generating article comprising an ordered aerosol-generating substrate having a coating layer according to claim 1, characterized in that The mass of the coating layer accounts for 5-30% of the mass of the reconstituted tobacco shreds.

7. A method for preparing an aerosol-generating article comprising an ordered aerosol-generating substrate having a coating layer as claimed in any one of claims 1 to 6, characterized in that: It includes the following steps: S1, preparing reconstituted tobacco leaf sheets; S2, applying a functional additive to the reconstituted tobacco leaf slice obtained in step S1, and drying the slice; S3, preparing a coating material mixture; S4, spraying the coating material mixture obtained in step S3 onto both sides of the reconstituted tobacco leaf slice obtained in step S2; S5, after the coating is completed, the reconstituted tobacco leaf slice with the coating material is dried to solidify the coating layer and tightly adhere to the reconstituted tobacco leaf slice to obtain a reconstituted tobacco leaf slice with a coating layer; S6, rolling: rolling the reconstituted tobacco leaf slices obtained in step S5 and putting them into a sealed bag for later use; S7, shredding, gathering and compounding: taking the rolled reconstituted tobacco leaf slices obtained in step S6 and shredding them to obtain reconstituted tobacco leaf shreds with a coating layer, wherein the reconstituted tobacco leaf shreds include a reconstituted tobacco leaf shred body and a coating layer coated on the outer surface of the reconstituted tobacco leaf shred body; Then, the obtained reconstituted tobacco shreds with a coating layer are orderly gathered using cigarette paper (21) to obtain an aerosol generating matrix (2), and the hollow cooling element (41) and the filter element (42) are compounded using the forming paper (43) using a compounding machine to obtain the composite cooling filter element (4). Then, the aerosol generating matrix (2), the support element (3), the composite cooling filter element (4) and the end cavity element (5) are compounded using the outer wrapping paper (1) using a compounding machine, and finally, the outer wrapping paper (1) on the outside of the composite cooling filter element (4) and the end cavity element (5) is wrapped with a tipping paper (6) to obtain an aerosol generating product.

8. The preparation method according to claim 7, characterized in that: In step S3, the method for preparing the coating material is: adding the main body of the coating material into the solvent and stirring to prepare a coating material mixed solution with a mass concentration of 4-15%; The coating material includes but is not limited to ethyl cellulose, shellac, carnauba wax, and the solvent includes alcohols, such as anhydrous ethanol.

9. The preparation method according to claim 7, characterized in that: In step S5, after coating is completed, the drying conditions include placing it in an oven for drying, or air-drying it with dry air. The drying conditions in the oven are: placing it in an oven at 45-60°C and baking it for 5-10 minutes; the dry air drying conditions are: air-drying it with dry air at 45-60°C for 5-10 minutes.

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