A tobacco rod-type aerosol generating article and a method of manufacturing the same

Abstract

The present application discloses a tobacco rod type aerosol generating article and a preparation method thereof. The aerosol generating article comprises an outer tube (3), a wrapping tube (4), a blocking component (5) and a filter component (6) located in the outer tube (3); the wrapping tube (4) has a tobacco rod (9) in the cavity, and the wrapping tube (4) is rolled by a composite paper material; the composite paper material comprises a paper layer (1) and an adsorption layer (2) close to the tobacco rod (9). The tobacco rod (9) is wrapped by the wrapping tube (4) rolled by the composite paper material, and the adsorption layer (2) of the composite paper material can adsorb the water or smoking agent in the smoking material, so as to prevent the water or smoking agent from penetrating to the outer wall of the paper tube, thereby preventing the generation of yellow spots.

Description

Technical Field

[0001] This invention relates to the field of heated non-combustible cigarette technology, specifically to a tobacco stick-shaped aerosol product and its preparation method. Background Technology

[0002] As consumers become increasingly health-conscious and demand more personalized experiences with cigarette products, the tobacco industry is constantly responding to these evolving needs by developing various smoking products with reduced tar and harm reduction features. Among these, heated cigarettes, due to their unique heating method compared to traditional cigarettes, offer a healthier smoking experience while satisfying consumers' sensory needs.

[0003] In existing technologies, the smoke-generating material for granular heated cigarettes is typically loose tobacco granules. Because these loose granules cannot be fixed in place, they must be filled into the outer tube using a filling method. This filling method limits production to batch filling of individual tubes, resulting in low production efficiency. Furthermore, the tobacco granules need to be secured on both sides using sealing paper and plugs, leading to a high defect rate.

[0004] To address the issue of loose tobacco particles, some researchers have used adhesives to bond loose tobacco particles together to form a cylindrical core rod. This core rod is then wrapped in cigarette paper and used as a standalone aerosol-generating matrix. It is then combined with other components through filling, rolling, or lamination processes to create aerosol-generating products. Because this smoking section is already a single, cylindrical core rod, the problem of tobacco particles falling and scattering is eliminated, thus eliminating the need for sealing films or plugs on both sides of the smoking section. Furthermore, the filling method is not limited when combining it with other components to create aerosol-generating products.

[0005] Currently, the method for preparing cylindrical tobacco core rods by bonding loose tobacco particles with hot melt adhesive involves directly placing the loose tobacco particles into a mixer, adding a large amount of adhesive to the mixer, mixing them evenly, extruding or molding them, wrapping the tobacco core rod with cigarette paper, and using it as an aerosol generating matrix rod. Then, it is combined with other components through filling, rolling, or composite processes to produce aerosol generating products. This method of preparing tobacco core rods has two main problems. Firstly, the tobacco core rods have low porosity: 1. Due to the large amount of coating material added during the mixing process, after cooling, the cooled coating material remains in the gaps between adjacent tobacco particles, resulting in low porosity and low axial air permeability. 2. If less coating material is added during mixing to avoid the first problem, the coating material will be unevenly dispersed, and adjacent tobacco particles without coating will not adhere, leading to particle scattering. 3. A more critical issue is that adding a large amount of coating material results in a significant coating layer on the surface of each tobacco particle, severely affecting the release of aerosols after heating. Essentially, the purpose of the coating layer is only to help scattered tobacco particles adhere, but it is undesirable for unadhesive areas to be covered by the coating material, thus hindering aerosol release. The second aspect is the time-consuming and labor-intensive problem of rolling cigarette paper after extrusion or molding: 1. If extrusion is used, an additional extrusion device is required, while molding requires a demolding process; 2. After the tobacco stick is formed, a rolling process is required, i.e., forming the stick and rolling are two steps, which is time-consuming and labor-intensive; 3. If the stick is combined with other components to make an aerosol product using a filling process, since the loose tobacco particles have been formed into a single tobacco stick, there is a problem of alignment when it is filled into the cavity of the aerosol product. If the tobacco stick is not completely and accurately aligned with the empty tube, the outer tube will deform or the tobacco stick will fall apart, reducing the yield.

[0006] Therefore, how to bind loose tobacco particles into a smoke generator while ensuring the porosity and smoke volume of the smoke generator, and how to prepare it through a feeding and packaging method, is a concern.

[0007] To address the above problems, this invention is proposed. Summary of the Invention

[0008] To distinguish them, the material wrapped in the paper tube in this invention is called an aerosol generating matrix rod, while the smoke-generating material inside the cigarette paper is called a tobacco rod.

[0009] The tobacco stick 9 of the present invention is wrapped with a wrapping tube 4 made of composite paper material. The adsorption layer 2 of the composite paper material can adsorb the moisture or smoking agent seeping out of the smoking material and prevent it from penetrating to the outer wall of the paper tube, thereby preventing the formation of yellow spots.

[0010] The first aspect of the present invention provides a tobacco stick-shaped aerosol generating article, which includes an outer tube 3, and a wrapping tube 4, a sealing component 5, and a filtering component 6 located inside the outer tube 3;

[0011] The cavity of the wrapping tube 4 contains a tobacco stick 9, and the wrapping tube 4 is made of composite paper material; the composite paper material includes a paper layer 1 and an absorbent layer 2 near the tobacco stick 9.

[0012] Preferably, the adsorption layer 2 comprises a porous material selected from activated carbon, molecular sieves, carbon molecular sieves, alumina, and calcium silicate powder; the application amount of the adsorption layer 2 is 20-90 g / cm³. 3 The method for preparing the composite paper material involves first preparing the paper layer 1, and then coating the paper layer 1 with a mixture containing porous materials and an adhesive using a calendering coating method; or, during the papermaking process in the preparation of the paper layer 1, coating the paper layer 1 with the mixture containing porous materials and an adhesive. The adhesive is selected from one or more of CMC, CM80, chitosan, hydroxypropyl methylcellulose, hydroxypropyl cellulose, povidone, sodium carboxymethyl cellulose, microcrystalline cellulose, polyethylene glycol, polyvinyl alcohol, and guar gum.

[0013] The adsorption layer on the composite paper material of this invention is not a thin layer, but has a certain thickness. The advantages of using this composite paper material to wrap tobacco sticks are: 1. To make the first layer adhesive, it needs to be activated under a certain humidity environment. The adsorption layer can absorb moisture from the environment to prevent the paper layer from getting damp. Furthermore, the adsorption layer can also adsorb moisture from the coating adhesive in the tobacco stick. 2. During cigarette storage, moisture from the tobacco-generating material seeps to the outside of the cigarette paper tube, causing yellow spots. In addition, tobacco-generating agents, flavorings, and fragrances are added to the tobacco-generating material. During long-term storage, the tobacco-generating agents in the tobacco-generating material can carry flavorings and fragrances to the outside of the paper tube, causing yellow spots and affecting the appearance of the paper tube. The adsorption layer can adsorb moisture or tobacco-generating agents seeping from the tobacco-generating material, preventing them from penetrating to the outer wall of the paper tube, thereby preventing the formation of yellow spots.

[0014] In this invention, the preparation method of tobacco pellets can refer to existing technologies, such as mixing tobacco powder, smoking agent, etc. into a slurry and then granulating it.

[0015] Preferably, a cavity structure 7 is further provided between the sealing component 5 and the filtering component 6.

[0016] Preferably, the cavity structure 7 further comprises a functional material; and / or,

[0017] The cavity structure 7 also includes a hollow tube functional component 8. The functional material can be any substance with cooling and aroma-enhancing functions as described in the prior art.

[0018] The composite paper material of this invention is rolled into a paper tube and then used as the empty tube functional component 8. The adsorption layer can adsorb functional substances such as fragrances or smoke-generating agents. Since the functional substances are adsorbed into the interior of the adsorption layer, they can be slowly released during the inhalation process, ensuring that the aroma is consistent before and after inhalation.

[0019] Preferably, the outer tube 3 has a vent 31 that radially penetrates the outer tube 3. When the cavity structure has a hollow tube functional component 8, the vent 31 penetrates both the outer tube and the hollow tube functional component 8. The purpose of the vent 31 is to introduce air into the aerosol generating product, thereby reducing the temperature of the aerosol and the suction resistance. Therefore, the need for a vent 31 is determined based on the actual aerosol temperature and suction resistance. The vent 31 can be located on the sealing component or the cooling component (i.e., the cavity structure) in the axial direction. When a vent 31 is required, it is preferable to create it by drilling through the tube. However, it is also possible to use breathable paper as the outer tube instead of drilling through the tube, as long as air can be introduced into the aerosol generating product.

[0020] Because the tobacco particles that are not bonded into rods are incorporated into the aerosol during the feeding process, the sealing component downstream of the tobacco particles needs to seal the loose tobacco particles. The sealing component of this invention can be a gear commonly used in the field. More preferably, the sealing component is selected from grooved corrugated parts with internally gathered sheet rods or multi-layered corrugated structures, etc. The selected sealing component structure can refer to the applicant's patent application with application number 202210706093.4 entitled "An Aerosol Generating Product with Composite Sealing Component", or application number 202210706095.3 entitled "An Aerosol Generating Product with Multi-layer Grooved Corrugated Structure", or application number 202210707599.7 entitled "An Aerosol Generating Product with Variable Diameter Airflow Channel Sealing Component", or application number 202211037571.3 entitled "An Aerosol Generating Product with Porous Aerosol Generating Matrix Rod Form Sealing Component".

[0021] Preferably, the preparation method of the aerosol generating product with a pre-reserved cavity is as follows: by using a composite rolling method, the outer tube is rolled to wrap the tube 4, the sealing component, and the filter component to obtain the aerosol generating product with a pre-reserved cavity. When there is a hollow tube functional component 8 between the sealing component and the filter component, the tube 4, the sealing component 5, the hollow tube functional component 8, and the filter component 6 are sequentially composited during rolling.

[0022] The second aspect of this invention provides a method for preparing the tobacco stick-shaped aerosol product described in the first aspect of this invention. This method involves first laminating and rolling the product to obtain an aerosol product with a pre-reserved cavity, and then forming a tobacco stick 9 within the pre-reserved cavity using a material dropping method. Specifically, it includes the following steps:

[0023] (A) In an environment with a humidity of less than 15%, a coating layer is applied to the surface of tobacco particles to obtain tobacco particles with a coating layer.

[0024] (B) The feeding device N1 loads the coated tobacco particles into the aerosol generating product with a pre-reserved cavity, and then transfers the aerosol generating product to an environment with a humidity greater than 40% and places it to stand. During the standing process, the coating layer is activated, and the tobacco particles are bonded into tobacco sticks 9 to obtain tobacco stick-shaped aerosol generating products, wherein the pre-reserved cavity is the location of the tobacco stick 9.

[0025] The surface of tobacco particles can be partially or completely coated.

[0026] Preferably, the coating layer is selected from one or more of hydroxypropyl methylcellulose, hydroxypropyl cellulose, povidone, sodium carboxymethyl cellulose, microcrystalline cellulose, polyethylene glycol, polyvinyl alcohol, and guar gum.

[0027] Preferably, the method for forming a coating layer on the surface of tobacco particles in step (A) is as follows: tobacco particles are added to a mixing tank, and the coating material is sprayed while stirring. After stirring for 5-25 minutes, the spraying of the coating material is stopped, and stirring is continued for another 5-20 minutes. Then, the tobacco particles with the coating material on their surface are conveyed to a fluidized bed and dried with cold air for 5-10 minutes until the coating material is dry on the surface of the tobacco particles and forms a coating layer. The coating material accounts for 40-75% of the weight of the tobacco particles.

[0028] Preferably, in step (A), tobacco extract, smoke-generating agent, flavorings, tobacco particles, and coating material can be added to the mixing tank and stirred together. Adding tobacco extract, smoke-generating agent, and flavorings can further increase the amount of smoke, smoke concentration, and aroma, thereby improving the quality of the smoke.

[0029] Preferably, the porosity of the tobacco stick 9 is 40-80%.

[0030] Preferably, in step (A), a second portion of tobacco particles without a coating layer is added to the tobacco particles with a coating layer on the surface after fluidized bed drying, and stirring is continued for 5-15 minutes, wherein the second portion of tobacco particles accounts for 5-30% of the total weight of the tobacco particles.

[0031] The purpose of batch mixing is to increase the porosity of tobacco sticks. If batch mixing is used, where loose tobacco particles are directly placed into a mixer, a large amount of coating material is added, and then the mixture is stirred until homogeneous, and the coating layer is activated to bind the tobacco particles into a stick, this method has the following problems: Cooled coating material remains in the gaps between adjacent tobacco particles in the stick, resulting in low porosity and low axial air permeability. Furthermore, the large amount of coating material applied to the surface of each tobacco particle severely affects the release of aerosols after heating.

[0032] This invention employs a batch mixing method to coat the surface of tobacco particles. First, a portion of tobacco particles and coating material are placed in a mixer and stirred. Once the surface of this portion of tobacco particles is partially coated, a second portion of tobacco particles is added to the mixer and stirred again. This ensures that only a portion of the tobacco particles have coating material on their surface. The second portion of tobacco particles, added in the second batch, has little or no coating material. During the bonding process, the mixed tobacco particles only need one particle to have coating material on its surface to achieve bonding; it is not necessary for both particles to have coating material. This prevents the coating material in the gap between the two particles from clogging the pores after cooling. This invention ensures the axial airflow and porosity of the tobacco core rod while achieving bonding.

[0033] Furthermore, by controlling the amount of coating material added, the present invention can ensure that only part of the surface of the first part of the tobacco particles has the coating material. Since the coating material is not applied to part of the surface of the tobacco particles, the release of aerosols after the tobacco particles are heated can be well guaranteed, thus ensuring the amount of smoke.

[0034] Preferably, in step (B), a steam application device can be used to provide an environment with a humidity greater than 40%.

[0035] Whether or not a steam application device is installed during actual production depends on the specific circumstances. If the water vapor in the ambient air is sufficient to activate the coating layer on the surface of the tobacco particles and the adhesiveness is sufficient to bind the loose smoke particles together, there is no need to install an additional steam application device. If the amount of water vapor in the ambient air is insufficient, an additional steam application device can be installed to provide water vapor and ensure ambient humidity.

[0036] The control of ambient humidity needs to be matched with the settling time, as both work together to ensure that the tobacco particles bond together into rods after settling. If, after a certain settling time, the particles remain loose and do not bond, the settling time can be extended or the ambient humidity increased to ensure that the loose tobacco particles bond together.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. After coating tobacco pellets, if conventional methods are used to first extrude or mold them into tobacco sticks and then roll them into cigarette paper, it requires two steps, which is time-consuming and labor-intensive. If the pellets are filled into the cavity of the aerosol product using a feeding method, there are problems with alignment. However, if the pellets are not formed into sticks and are directly filled in before forming into sticks, there is a problem that the tobacco pellets are already inside the outer tube and cannot be formed into sticks. In addition, because the coating material is very sensitive to humidity, the humidity of water vapor in the air can activate it and increase its viscosity. If the tobacco pellets are not immediately formed into tobacco sticks after coating, the coated tobacco pellets need to be sealed and stored under strict storage conditions, which can easily lead to material waste due to improper storage. This invention involves directly filling the cavity of an aerosol-generated product into a coated tobacco particle after coating the surface of the tobacco particles. The aerosol-generated product is then transferred to an environment with a humidity greater than 15% and left to stand. During the standing process, the coating layer is activated, which binds the tobacco particles into tobacco rods 9. This method not only realizes the formation of tobacco particles into rods inside the outer tube, but also solves the problem of difficult alignment during material feeding.

[0039] 2. This invention controls the flowability of coated tobacco particles by regulating the adhesive force of the coating layer through humidity control. In a dry environment with humidity less than 15%, the coating layer has no adhesive force, and the coated tobacco particles are completely loose and flowable, allowing for the feeding process. However, when the humidity exceeds 40%, the coating layer deliquesces and becomes more viscous, binding the loose tobacco particles into a smoking body, at which point the tobacco particles become non-flowable. Furthermore, the deliquescence of the coating layer is irreversible. Once the coating layer has increased its viscosity and bound the loose tobacco particles into a smoking body, it will not lose its adhesiveness and revert to its original shape even if the humidity decreases.

[0040] 3. The present invention can coat the surface of tobacco particles with a coating layer by batch mixing. First, a portion of tobacco particles and coating material are placed in a mixer and stirred. After the surface of this portion of tobacco particles is partially coated with the coating material, a second portion of tobacco particles is added to the mixer and stirred. This ensures that only a portion of the tobacco particles have the coating material on their surface. The second portion of tobacco particles is added in the second batch, and its surface has no coating material or very little coating material. During the bonding process, when the mixed tobacco particles come into contact, as long as one tobacco particle has the coating material on its surface, the two particles can be bonded together. It is not necessary for both particles to have the coating material on their surfaces. This avoids the coating material in the gap formed between the two particles after bonding cooling and clogging the pores. The present invention ensures the axial airflow and porosity of the tobacco core rod while achieving bonding.

[0041] 4. By controlling the amount of coating material added, this invention can ensure that only part of the surface of the first part of the tobacco particles has coating material. Since the surface of the tobacco particles is not coated, the release of aerosols after the tobacco particles are heated can be well guaranteed, thus ensuring the amount of smoke.

[0042] 5. The composite paper material of this invention is used in aerosol-generating products in two forms. The first is for wrapping tobacco sticks 9. During cigarette storage, moisture from the smoking material seeps to the outside of the cigarette paper tube, causing yellow spots. Furthermore, smoking agents and flavorings are added to the smoking material. Over time, the smoking agents in the smoking material carry flavorings and seep to the outside of the paper tube, causing yellow spots and affecting the appearance of the paper tube. The adsorption layer of the composite paper material can adsorb moisture or smoking agents seeping from the smoking material, preventing them from penetrating to the outer wall of the paper tube, thus preventing yellow spots. The second form is as a cooling element in the empty tube functional component 8 after being rolled into a paper tube. The adsorption layer on the composite paper material of this invention is not a thin layer but has a certain thickness. The adsorption layer can adsorb flavorings, fragrances, or smoking agents and other functional substances. Since the functional substances are adsorbed inside the adsorption layer, they can be slowly released during the inhalation process, ensuring consistent aroma before and after inhalation.

[0043] 6. On the one hand, the adsorption layer can prevent the yellow stains caused by the leakage of the smoking agent or flavoring in the smoking material. On the other hand, the smoking agent or flavoring in the smoking material is adsorbed into the porous material of the adsorption layer. As the tobacco stick continues to be heated, the smoking agent or flavoring in the porous material is further released, thereby playing a role in preserving the aroma. Attached Figure Description

[0044] Figure 1 A schematic diagram of the structure of composite paper materials.

[0045] Figure 2 A process diagram for preparing tobacco stick aerosol products generated by dropping material.

[0046] Figure 3 Example 1: Schematic diagram of a three-section cigarette structure.

[0047] Figure 4 Example 2: Schematic diagram of a four-segment cigarette structure with a cavity.

[0048] The names of the reference numerals in the accompanying drawings are as follows: 1-paper layer, 2-absorbent layer, 3-outer tube, 4-wrapping tube, 5-sealing component, 6-filter component, 7-cavity structure, 8-cavity tube functional component, 9-tobacco stick, 31-ventilation hole;

[0049] N1 - Material feeding device. Detailed Implementation

[0050] The present invention will now be described in further detail with reference to the embodiments.

[0051] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with the techniques or conditions described in the literature in the field or according to the product instructions. Materials or equipment whose manufacturers are not specified are all conventional products that can be obtained by purchase.

[0052] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated 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 say an element is “connected” to another element, it can be directly connected to the other element, or there may be an intermediate element. Furthermore, the term “connected” as used herein can include wireless connections.

[0053] In the description of this invention, unless otherwise stated, "a plurality of" means two or more. The terms "inner," "upper," "lower," etc., indicate the orientation or state relationship based on the orientation or state relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the 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 commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0056] Example 1

[0057] The aerosol generating product of this embodiment includes an outer tube 3, and a wrapping tube 4, a sealing component 5, and a filtering component 6 located inside the outer tube 3;

[0058] The cavity of the wrapping tube 4 contains a tobacco stick 9, and the wrapping tube 4 is made of composite paper material; the composite paper material includes a paper layer 1 and an absorbent layer 2 near the tobacco stick 9.

[0059] The adsorption layer 2 is activated carbon, and the application rate of the adsorption layer 2 is 40 g / cm³. 3 The method for preparing the composite paper material involves first preparing the paper layer 1, and then coating the paper layer 1 with a mixture containing porous materials and an adhesive by calendering and coating. The adhesive is selected from CMC.

[0060] The outer tube 3 has a vent 31 that extends radially through the outer tube 3. The vent is located axially on the sealing component.

[0061] The preparation method of the flue-feed tobacco stick aerosol product in this embodiment includes the following steps:

[0062] (A) In an environment with a humidity of less than 15%, a coating layer is applied to the surface of tobacco particles to obtain tobacco particles with a coating layer.

[0063] (B) The feeding device N1 loads the coated tobacco particles into the aerosol generating product with a pre-reserved cavity, and then transfers the aerosol generating product to an environment with a humidity greater than 40% and places it to stand. During the standing process, the coating layer is activated, and the tobacco particles are bonded into tobacco sticks 9 to obtain tobacco stick-shaped aerosol generating products, wherein the pre-reserved cavity is the location of the tobacco stick.

[0064] The surface of tobacco particles can be partially or completely coated.

[0065] The coating layer is selected from hydroxypropyl methylcellulose.

[0066] The method for forming a coating layer on the surface of tobacco particles in step (A) is as follows: tobacco particles are added to a mixing tank, and the coating material is sprayed while stirring. After stirring for 15 minutes, the spraying of the coating material is stopped, and stirring is continued for 10 minutes. Then, the tobacco particles with the coating material on their surface are transported to a fluidized bed and dried with cold air for 10 minutes until the coating material is dry on the surface of the tobacco particles and forms a coating layer. The coating material accounts for 70% of the weight of the tobacco particles.

[0067] In step (A), tobacco extract, smoke-generating agent, flavorings, and tobacco particles and coating materials can also be added to the mixing tank and stirred together. Adding tobacco extract, smoke-generating agent, and flavorings can further increase the amount of smoke, smoke concentration, and aroma, thereby improving the quality of the smoke.

[0068] The porosity of the tobacco rod 9 is 70%.

[0069] Step (A): Add a second portion of tobacco particles without a coating layer to the tobacco particles with a coating layer on the surface after fluidized bed drying, and continue stirring for 10 minutes, wherein the second portion of tobacco particles accounts for 5% of the total weight of the tobacco particles.

[0070] In step (B), a steam application device can be used to provide an environment with a humidity greater than 40%.

[0071] Example 2

[0072] The difference between the aerosol generating product in this embodiment and that in Example 1 is:

[0073] The sealing component 5 and the filtering component 6 also have a cavity structure 7.

[0074] The cavity structure 7 also includes a hollow tube functional component 8.

[0075] In this embodiment, the composite paper material is rolled into a paper tube and used as the empty tube functional component 8. The adsorption layer can adsorb functional substances such as fragrances or smoke generators. Since the functional substances are adsorbed into the adsorption layer, they can be slowly released during the inhalation process, ensuring that the aroma is consistent before and after inhalation.

[0076] The outer tube 3 has a vent 31 that penetrates radially through the outer tube 3. The vent is located axially in the cavity structure.

Claims

1. A method for preparing a tobacco rod type aerosol generating article, characterized in that, the tobacco rod type aerosol generating article comprises an outer tube (3), and a wrapping tube (4), a blocking component (5), and a filter component (6) located in the outer tube (3); the wrapping tube (4) has a tobacco rod (9) in the cavity thereof, and the wrapping tube (4) is rolled by a composite paper material; the composite paper material comprises a paper layer (1) and an adsorption layer (2) close to the tobacco rod (9); the method comprises the following steps: (A) coating a coating layer on the surface of tobacco particles in an environment with a humidity less than 15%, to obtain tobacco particles with a coating layer; (B) a material feeding device (N1) loads the tobacco particles with the coating layer into the aerosol generating article with a reserved cavity, and then transfers the aerosol generating article to an environment with a humidity greater than 40% for standing, during which the coating layer is activated to bond the tobacco particles into a tobacco rod (9), to obtain a tobacco rod type aerosol generating article, wherein the reserved cavity is the position of the tobacco rod; the coating layer is selected from one or more of hydroxypropyl methylcellulose, hydroxypropyl cellulose, povidone, sodium carboxymethyl cellulose, microcrystalline cellulose, polyethylene glycol, polyvinyl alcohol, and guar gum; in step (A), tobacco extract, smoke generating agent, and essence and spices are added into the stirring barrel together with the tobacco particles and the coating layer material for stirring; the porosity of the tobacco rod (9) is 40-80%; in step (A), the method for forming the coating layer on the surface of the tobacco particles is as follows: the tobacco particles are added into a stirring barrel, and the coating layer material is sprayed while stirring; after 5-25 minutes of stirring, the spraying of the coating layer material is stopped, and the stirring is continued for 5-20 minutes; then the tobacco particles with the coating layer material on the surface are transported to a fluidized bed for air drying by cold air, and the air drying time is 5-10 minutes, until the coating layer material is dried on the surface of the tobacco particles and forms a coating layer; wherein the percentage of the coating layer material in the weight of the tobacco particles is 40-75%.

2. The method of claim 1, wherein, In step (A), second part of tobacco particles without the coating layer on the surface are added into the tobacco particles with the coating layer on the surface after the fluidized bed drying, and the stirring is continued for 5-15 minutes, wherein the second part of tobacco particles accounts for 5-30% of the total weight of the tobacco particles.

3. The method of claim 1, wherein, In step (B), a steam application device can be used to provide the environment with a humidity greater than 40%.

4. The method of claim 1, wherein, The adsorption layer (2) comprises a porous material in the form of a powder having a mesh size of 80-1000 mesh, the porous material being selected from activated carbon, molecular sieve, carbon molecular sieve, alumina or calcium silicate; the application amount of the adsorption layer (2) is 20-90 g / cm 3 The composite paper material is prepared by first preparing the paper layer (1) and then applying a mixture comprising a porous material and a binder to the paper layer (1) by a calender coating method or by applying the mixture comprising a porous material and a binder to the paper layer (1) during the papermaking process in the preparation of the paper layer (1).

5. The method of claim 1, wherein, the blocking component (5) and the filter component (6) further have a cavity structure (7) therebetween; the cavity structure (7) further contains a functional material; and / or, the cavity structure (7) further contains an empty tube functional part (8).

6. The method of claim 1, wherein, the outer tube (3) has a ventilation hole (31) radially penetrating the outer tube (3).

7. The method of claim 1, wherein, The method for preparing the aerosol generating article with a reserved cavity is as follows: the wrapping tube (4), the blocking component (5), and the filter component (6) are rolled by the outer tube (3) through a composite rolling method, to obtain the aerosol generating article with a reserved cavity.

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