A flavored cigarette core material, its preparation method and application

Abstract

This invention relates to a flavored cigarette core material, its preparation method, and its application. The preparation method includes the following steps: coating a bottom slurry to form a wet film; applying a solid flavoring material onto the wet film to obtain an intermediate film; coating an upper slurry onto the intermediate film and drying it to obtain the flavored cigarette core material. The preparation method provided by this invention allows for the direct application of solid flavoring materials to the cigarette core material without the need for a solution, effectively solving the problem of solid flavoring materials being insoluble or only slightly soluble in solvents, and effectively improving the sensory quality of heated cigarettes.

Description

Technical Field

[0001] This invention relates to the field of heated cigarette technology, and in particular to a flavored cigarette core material, its preparation method, and its application. Background Technology

[0002] The aroma of cigarettes primarily relies on a well-balanced blend of tobacco leaves, but flavorings can enrich and refine the tobacco aroma, ensuring its stability. Utilizing the masking properties of flavoring substances, off-flavors in cigarettes can be masked, diluted, and neutralized, resulting in cigarettes with not only a rich and fragrant aroma but also a sweet, mellow, and refreshing taste, along with harmonious initial and aftertastes. While maintaining harmony between the added flavorings and the tobacco aroma, cigarettes can be endowed with different aroma profiles, such as light, strong, sweet, fruity, chocolate, spicy, and wine-like, catering to the needs of consumers with diverse smoking preferences.

[0003] The common method of flavoring heated cigarettes is to dissolve the flavoring in a solvent and apply it to the surface of the heated cigarette core material by spraying. For some slightly soluble or insoluble solid flavoring raw materials, the flavoring can be applied by increasing the proportion of solvent. However, as the proportion of solvent increases, the liquid flavoring will seep out of the cigarette paper. At the same time, the strength of the heated cigarette core material will decrease, the characteristic aroma will not be obvious in the sensory sense, and the flavoring cannot effectively play its role.

[0004] CN106010794A discloses a method for preparing a fragrance essence for enhancing the aroma of agarwood in cigarettes and its application. The fragrance essence is prepared by mixing 15-25 parts of jujube oil, 0.1-1 parts of East Indian sandalwood oil, 0.2-2 parts of perilla frutescens, 3-10 parts of ethyl acetate, 0.5-5 parts of fragrant perilla oil, and 25-85 parts of ethanol, stirring, allowing to stand, and then filtering to remove sediment. The fragrance essence is then diluted with a 50-95% (w / w) ethanol solution and sprayed directly onto tobacco shreds to produce cigarettes.

[0005] CN110959905A discloses a method for preparing a heat-not-burn cigarette sheet, comprising: mixing tobacco stems, solid residues from tobacco dust extraction, and fiber additives to form a pulp, and then forming a substrate; mixing tobacco powder, a first atomizing agent, a first flavoring agent, a first adhesive, and a solvent in a mass ratio of (50-60):(15-25):(0.05-0.1):(1-2):(20-30) to obtain a solid-phase coating material; mixing tobacco dust extract, tobacco powder, a second atomizing agent, a second flavoring agent, and a second adhesive in a mass ratio of (50-60):(20-40):(10-20):(0.05-0.1):(1-1.5) to obtain a liquid-phase coating material; coating the solid-phase coating material and the liquid-phase coating material onto different surfaces of the substrate, and drying them to obtain the heat-not-burn cigarette sheet.

[0006] Existing techniques for adding fragrance by spraying or coating cannot be applied to slightly soluble or insoluble solid flavorings. Therefore, developing a method for preparing flavored cigarette core materials that enhances the persistence, intensity, and consistency of flavor release has good application prospects. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a flavored cigarette core material, its preparation method, and its application. The preparation method provided by this invention allows for the direct application of solid flavoring raw materials to the cigarette core material without the need for solution preparation, effectively solving the problem of solid flavoring raw materials being insoluble or only slightly soluble in solvents, and significantly improving the sensory quality of heated cigarettes.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a method for preparing flavored cigarette core material, the method comprising the following steps:

[0010] A bottom layer of slurry is coated to form a wet film, and a solid flavoring material is applied to the wet film to obtain an intermediate film; an upper layer of slurry is coated on the intermediate film and dried to obtain the flavored cigarette core material.

[0011] This invention uses a bottom slurry as a base and applies solid fragrance raw materials directly onto the bottom slurry, effectively avoiding the problem that solid fragrance raw materials are insoluble or only slightly soluble in solvents; then, through a secondary coating method, the solid fragrance raw materials are embedded in the two layers of slurry, which can effectively suppress the escape of solid fragrance raw materials.

[0012] Meanwhile, by applying solid flavoring ingredients, the impact of flavoring solvents on smoke production performance can be reduced, thereby increasing the amount of smoke. When heated cigarettes are smoked, the solid flavoring releases aroma substances from the core material. Compared to spraying flavorings, this method can enhance the persistence, intensity, and consistency of flavor release, effectively improving the sensory quality of heated cigarettes.

[0013] Preferably, the bottom slurry comprises, by weight: 15-25 parts of tobacco powder (e.g., 17, 19, 20, 21, 23, etc.), 1-2 parts of wood pulp fiber (e.g., 1.1, 1.2, 1.4, 1.6, 1.8, 1.9, etc.), 1-5 parts of modified cellulose (e.g., 1.5, 2, 2.5, 3, 3.5, 4, 4.5, etc.), 5-10 parts of glycerol (e.g., 5.5, 6, 7, 8, 9, 9.5, etc.), and 40-60 parts of water (e.g., 42, 44, 46, 48, 50, 52, 54, 56, 58, etc.).

[0014] Preferably, the modified cellulose includes any one or a combination of at least two of carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, or hydroxyethyl cellulose.

[0015] Preferably, the upper slurry comprises, by weight, 15-25 parts of tobacco powder (e.g., 17, 19, 20, 21, 23, etc.), 1-2 parts of wood pulp fiber (e.g., 1.1, 1.2, 1.4, 1.6, 1.8, 1.9, etc.), 1-5 parts of nanocellulose (e.g., 1.5, 2, 2.5, 3, 3.5, 4, 4.5, etc.), 5-10 parts of glycerol (e.g., 5.5, 6, 7, 8, 9, 9.5, etc.), and 70-90 parts of water (e.g., 72, 74, 76, 78, 80, 82, 84, 86, 88, etc.).

[0016] Preferably, the nanocellulose includes any one or a combination of at least two of cellulose nanocrystals, bacterial cellulose, or microfibrillated cellulose.

[0017] The present invention uses specific types of cellulose in the bottom slurry and the top slurry. The bottom slurry uses modified cellulose with a lower density, while the top slurry uses nanocellulose with a relatively higher density, which makes it easier for solid fragrance raw materials to be incorporated into the bottom slurry.

[0018] During inhalation, the solid fragrance raw material is heated, and due to the difference in fiber density on both sides, more of it escapes from the bottom layer. Compared with the fragrance raw material that escapes from both sides, it can increase the fragrance release time, improve the uniformity of inhalation, and improve the consistency of each puff.

[0019] Meanwhile, by controlling the amount of water added to the two layers of slurry, the density difference between different types of cellulose between the two layers can be effectively balanced, which is conducive to the fusion of the two layers of slurry. After subsequent treatment, the smoothness of the upper and lower layers is consistent, which is convenient for processing and production.

[0020] Preferably, the method for preparing the wet film includes: casting the bottom slurry on a coating machine to obtain the wet film.

[0021] Preferably, the height of the casting is 0.4 to 0.6 mm, for example, it can be 0.42 mm, 0.44 mm, 0.46 mm, 0.48 mm, 0.5 mm, 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0022] Preferably, the casting temperature is 65-75°C, for example, it can be 66°C, 67°C, 69°C, 71°C, 73°C, 74°C, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0023] Preferably, the particle size of the solid fragrance raw material is 150-250 mesh, for example, it can be 160 mesh, 170 mesh, 180 mesh, 190 mesh, 200 mesh, 210 mesh, 220 mesh, 230 mesh, 240 mesh, etc. Other specific values ​​in this range can be selected, and will not be described in detail here.

[0024] Preferably, the solid fragrance raw material includes any one or a combination of at least two of menthol, vanillin, ethyl vanillin, maltol, ethyl maltol, or borneol.

[0025] Preferably, the solid fragrance raw material is pulverized in a cryogenic pulverizer and then sieved before application.

[0026] Preferably, the pulverization temperature is -30 to 0°C, for example, it can be -28°C, -26°C, -24°C, -22°C, -17°C, -15°C, -10°C, -5°C, etc. Other specific values ​​within this range can be selected, and will not be elaborated here. More preferably, it is -30 to -20°C.

[0027] The solid fragrance raw material of the present invention is pulverized under freezing conditions, which can effectively avoid the solid fragrance raw material from agglomerating due to mechanical friction, and make the solid fragrance more evenly distributed in the core material.

[0028] Preferably, the method for applying the solid fragrance raw material includes: placing the solid fragrance raw material on a powder-spreading vibrating screen and spreading powder on the bottom slurry.

[0029] Preferably, the powder-spreading vibrating screen has a screen.

[0030] Preferably, the aperture of the screen is 150 to 250 mesh, for example, it can be 160 mesh, 170 mesh, 180 mesh, 190 mesh, 200 mesh, 210 mesh, 220 mesh, 230 mesh, 240 mesh, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0031] Preferably, the sieve mesh has a mesh width of 0.5 to 1.5 cm, such as 0.6 cm, 0.7 cm, 0.8 cm, 0.9 cm, 1.0 cm, 1.1 cm, 1.2 cm, 1.3 cm, 1.4 cm, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0032] Preferably, the amount of the solid fragrance raw material applied is 0.005–0.015 g / cm³.2 For example, it could be 0.007 g / cm³. 2 0.009g / cm 2 0.01g / cm 2 0.012g / cm 2 0.014 g / cm 2 Other specific point values ​​within this range can also be selected, and will not be elaborated on here.

[0033] Preferably, the solid fragrance raw material is further dried after application.

[0034] Preferably, the drying temperature is 60-80℃, for example, it can be 62℃, 64℃, 68℃, 72℃, 76℃, 78℃, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0035] Preferably, the surface moisture content of the dried film is 50-80% RH, for example, it can be 55% RH, 60% RH, 65% RH, 70% RH, 75% RH, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0036] The present invention involves baking the bottom slurry to the appropriate moisture content and then applying the top slurry, which facilitates the fusion of the two slurries and ensures the actual adaptability of the core material.

[0037] Preferably, the thickness of the upper slurry coating on the intermediate film is 0.4 to 0.6 mm, for example, it can be 0.42 mm, 0.44 mm, 0.46 mm, 0.48 mm, 0.50 mm, 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0038] Preferably, after coating the intermediate film with the upper slurry, a drying step is also included.

[0039] Preferably, the drying temperature is 90-100℃, for example, it can be 91℃, 92℃, 94℃, 96℃, 98℃, 99℃, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0040] Preferably, the surface moisture content of the dried upper slurry is 3-10% RH, for example, it can be 4% RH, 5% RH, 6% RH, 7% RH, 8% RH, 9% RH, etc. Other specific values ​​within this range can be selected, and will not be elaborated here. More preferably, it is 5-7% RH.

[0041] Preferably, the preparation method includes the following steps:

[0042] (1) Provide a base slurry, wherein the base slurry comprises, by weight, 15-25 parts of tobacco powder, 1-2 parts of wood pulp fiber, 1-5 parts of modified cellulose, 5-10 parts of glycerol and 40-60 parts of water;

[0043] The bottom slurry is cast on a coating machine to a height of 0.4-0.6 mm and a temperature of 65-75°C to obtain a wet film.

[0044] (2) Apply solid fragrance raw materials with a particle size of 150-250 mesh to the wet film obtained in step (1) through a powder-sprinkling vibrating screener, and dry them at 60-80°C until the surface moisture of the wet film is 50-80%RH to obtain an intermediate film;

[0045] The amount of the solid fragrance raw material applied is 0.005–0.015 g / cm³. 2 ;

[0046] (3) Coat the upper slurry onto the intermediate film obtained in step (2) with a thickness of 0.4 to 0.6 mm, and then dry it at 90 to 100°C until the surface moisture content of the upper slurry is 3 to 10% RH to obtain the flavored cigarette core material;

[0047] The upper slurry comprises, by weight, 15-25 parts tobacco powder, 1-2 parts wood pulp fiber, 1-5 parts nanocellulose, 5-10 parts glycerol, and 70-90 parts water.

[0048] Secondly, the present invention provides a flavored cigarette core material prepared by the preparation method described in the first aspect.

[0049] Thirdly, the present invention provides a heated cigarette, the raw material of which includes the flavored cigarette core material as described in the second aspect.

[0050] Compared with the prior art, the present invention has at least the following beneficial effects:

[0051] This invention employs a direct application of solid flavorings, effectively avoiding the problem of solid flavoring raw materials being insoluble or only slightly soluble in solvents. By embedding the solid flavoring raw materials between two layers of slurry, the escape of solid flavorings can be effectively suppressed. At the same time, when heated cigarettes are smoked, the solid flavorings release aroma substances from the center of the core material. Compared with the method of spraying flavorings, this method can enhance the persistence, intensity, and consistency of flavoring release, and can effectively improve the sensory quality of heated cigarettes. Detailed Implementation

[0052] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0053] The tobacco powder used in the following examples is sourced from domestic and international flue-cured tobacco. The wood pulp fiber is sourced from Brazilian Goldfish brand hardwood. Carboxymethyl cellulose, cellulose nanocrystals, methyl cellulose, and microfibrillated cellulose were all purchased from Hengda Hydrocolloid Taizhou Co., Ltd. The solid flavoring raw material is vanillin, purchased from Henan Xinqiao Tobacco Technology Service Co., Ltd. Other raw materials are commercially available conventional products.

[0054] Example 1

[0055] This embodiment provides a method for preparing flavored cigarette core material, the specific steps of which are as follows:

[0056] (1) By weight, 20 parts of tobacco powder, 1.5 parts of wood pulp fiber, 2.5 parts of carboxymethyl cellulose, 7.5 parts of glycerol and 50 parts of water are mixed to obtain a bottom layer slurry; the bottom layer slurry is cast on a coating machine with a height of 0.5 mm and a temperature of 70 °C to obtain a wet film.

[0057] (2) The solid incense raw materials are pulverized in a -25℃ freeze pulverizer and passed through a 200-mesh sieve. The pulverized and sieved solid incense raw material powder is placed on a powder-spreading vibrating screen machine with a 200-mesh sieve and a sieve mesh width of 1cm. The application rate of the solid incense raw material is set to 0.01g / cm. 2 After solid fragrance application, the film is baked at 70°C until the surface moisture content of the wet film is 65% RH, thus obtaining an intermediate film.

[0058] (3) By weight, 20 parts of tobacco powder, 1.5 parts of wood pulp fiber, 2.5 parts of cellulose nanocrystals, 7.5 parts of glycerol and 80 parts of water are mixed to obtain the upper slurry; the upper slurry is coated on the intermediate film obtained in step (2) with a thickness of 0.5 mm, and then baked and dried at 95°C until the surface moisture of the upper slurry is 6%RH to obtain the flavored cigarette core material.

[0059] Example 2

[0060] This embodiment provides a method for preparing flavored cigarette core material, the specific steps of which are as follows:

[0061] (1) By weight, 15 parts of tobacco powder, 1 part of wood pulp fiber, 1 part of carboxymethyl cellulose, 5 parts of glycerol and 40 parts of water are mixed to obtain a bottom layer slurry; the bottom layer slurry is cast on a coating machine with a height of 0.4 mm and a temperature of 65 °C to obtain a wet film.

[0062] (2) The solid incense raw material is pulverized in a -30℃ freeze pulverizer and passed through a 150-mesh sieve. The pulverized and sieved solid incense raw material powder is placed on a powder-spreading vibrating screen machine with a 150-mesh sieve and a sieve mesh width of 0.5cm. The application rate of the solid incense raw material is set to 0.015g / cm. 2After the solid fragrance is applied, it is baked at 60°C until the surface moisture content of the wet film is 50% RH, thus obtaining the intermediate film.

[0063] (3) By weight, 15 parts of tobacco powder, 1 part of wood pulp fiber, 1 part of cellulose nanocrystals, 7.5 parts of glycerol and 70 parts of water are mixed to obtain the upper slurry; the upper slurry is coated on the intermediate film obtained in step (2) with a thickness of 0.4 mm, and then baked and dried at 90°C until the surface moisture of the upper slurry is 8%RH to obtain the flavored cigarette core material.

[0064] Example 3

[0065] This embodiment provides a method for preparing flavored cigarette core material, the specific steps of which are as follows:

[0066] (1) By weight, 25 parts of tobacco powder, 2 parts of wood pulp fiber, 5 parts of carboxymethyl cellulose, 10 parts of glycerol and 60 parts of water are mixed to obtain a bottom layer slurry; the bottom layer slurry is cast on a coating machine with a height of 0.6 mm and a temperature of 75 °C to obtain a wet film.

[0067] (2) The solid incense raw material is pulverized in a -15℃ freeze pulverizer and passed through a 250-mesh sieve. The pulverized and sieved solid incense raw material powder is placed on a powder-spreading vibrating screen machine with a 250-mesh sieve and a sieve mesh width of 1.5cm. The application rate of the solid incense raw material is set to 0.005g / cm. 2 After the solid fragrance is applied, it is baked at 80°C until the surface moisture content of the wet film is 80% RH, thus obtaining the intermediate film.

[0068] (3) By weight, 25 parts tobacco powder, 2 parts wood pulp fiber, 5 parts cellulose nanocrystals, 10 parts glycerol and 90 parts water are mixed to obtain the upper slurry; the upper slurry is coated on the intermediate film obtained in step (2) with a thickness of 0.6 mm, and then baked and dried at 100°C until the surface moisture of the upper slurry is 4%RH to obtain flavored cigarette core material.

[0069] Example 4

[0070] This embodiment provides a method for preparing flavored cigarette core material. The only difference between this method and Example 1 is that methyl cellulose is used to replace carboxymethyl cellulose in step (1).

[0071] Example 5

[0072] This embodiment provides a method for preparing flavored cigarette core material. The only difference between this method and Example 1 is that microfibrillated cellulose is used to replace the cellulose nanocrystals in step (3).

[0073] Example 6

[0074] This embodiment provides a method for preparing flavored cigarette core material. The only difference between this method and Example 1 is that carboxymethyl cellulose is used to replace the cellulose nanocrystals in step (3).

[0075] Example 7

[0076] This embodiment provides a method for preparing flavored cigarette core material. The only difference between this method and Example 1 is that cellulose nanocrystals are used to replace carboxymethyl cellulose in step (1).

[0077] Example 8

[0078] This embodiment provides a method for preparing flavored cigarette core material. The only difference between this method and that of Embodiment 1 is that cellulose nanocrystals are used to replace carboxymethyl cellulose in step (1) and carboxymethyl cellulose is used to replace cellulose nanocrystals in step (3).

[0079] Example 9

[0080] This embodiment provides a method for preparing flavored cigarette core material. The only difference between this method and Example 1 is that the amount of water used in step (1) is 90 parts, and the casting height of the bottom slurry is adjusted so that the final core material thickness is the same as that in Example 1.

[0081] Example 10

[0082] This embodiment provides a method for preparing flavored cigarette core material. The only difference between this method and Example 1 is that the amount of water used in step (3) is 50 parts, and the coating thickness of the upper slurry is adjusted so that the final core material thickness is the same as that in Example 1.

[0083] Example 11

[0084] This embodiment provides a method for preparing flavored cigarette core material. The only difference between this method and that of Embodiment 1 is that in step (2), the material is baked and dried until the surface moisture content of the wet film is 65% RH to obtain an intermediate film.

[0085] Example 12

[0086] This embodiment provides a method for preparing flavored cigarette core material. The only difference between this method and that of Embodiment 1 is that in step (2), the material is baked and dried until the surface moisture content of the wet film is 95% RH to obtain an intermediate film.

[0087] Example 13

[0088] This embodiment provides a method for preparing flavored cigarette core material. The only difference between this method and that of Embodiment 1 is that in step (2), the solid flavoring raw material is pulverized in a pulverizer at 5°C.

[0089] Comparative Example 1

[0090] This comparative example provides a method for preparing flavored cigarette core material. The only difference between this method and Example 1 is that step (3) is omitted. After solid flavoring is applied in step (2), the material is baked and dried until the surface moisture content of the wet film is 6% RH to obtain flavored cigarette core material.

[0091] Comparative Example 2

[0092] This comparative example provides a method for preparing flavored cigarette core material. The only difference between this method and Example 1 is that step (3) is omitted, the casting height of the bottom layer slurry in step (1) is adjusted to 1.2 mm, and after solid flavoring is applied in step (2), the material is baked and dried until the surface moisture content of the wet film is 6% RH. The thickness of the finished core material is the same as that in Example 1.

[0093] Comparative Example 3

[0094] This comparative example provides a method for preparing flavored cigarette core material. The only difference between this method and Example 1 is that steps (2) and (3) are omitted. After baking, the wet film obtained in step (1) is sprayed with liquid flavoring. The amount of liquid flavoring applied is calculated based on the amount of solid flavoring raw material, which is 0.005 g / cm³. 2 .

[0095] Application Example 1

[0096] This application example provides a heated cigarette, the preparation method of which is as follows:

[0097] The flavored cigarette core material prepared in Example 1 was cut into shreds, rolled into core material rods with forming paper, and inserted into a cigarette containing a filter to obtain a heated cigarette.

[0098] Application Example 2-13, Comparison with Application Example 1-3

[0099] Application Examples 2-13 and Comparative Application Examples 1-3 each provide a heated cigarette. The only difference between them and Application Example 1 is that the flavored cigarette core material prepared in Example 1 is replaced with the flavored cigarette core material prepared in Example 2-13 and Comparative Examples 1-3. The preparation method is the same as in Application Example 1.

[0100] Test Example 1

[0101] Sensory effect evaluation

[0102] Test samples: heated cigarettes provided in Application Examples 1-13 and Comparative Application Examples 1-3.

[0103] Test method: Sensory evaluation of the samples was conducted using a scoring method. The evaluation panel consisted of 10 members, who scored the samples from five aspects: aroma characteristics, smoke characteristics, harmony, taste characteristics, and smoke generation characteristics. The scoring criteria are shown in Table 1.

[0104] Table 1

[0105]

[0106] Sensory evaluations of the heated cigarettes provided in each application example were conducted using the methods described above, and the results are shown in Table 2.

[0107] Table 2

[0108]

[0109]

[0110] The test results show that:

[0111] (1) As can be seen from Application Examples 1 to 13, the present invention directly applies solid flavoring raw materials to obtain flavored cigarette core material through a specific preparation method. The resulting heated cigarette has a strong aroma and high smoke characteristics, with better coordination, taste characteristics and smoke generation characteristics, and high overall sensory quality.

[0112] (2) By comparing Application Example 1 with Application Examples 6-8, it can be seen that the bottom layer of the present invention uses modified cellulose with a lower density and the top layer of the slurry uses nanocellulose with a relatively higher density, which makes it easier for solid flavor raw materials to be incorporated into the two layers of slurry, and the resulting cigarettes have higher sensory quality.

[0113] By comparing Application Example 1 with Application Examples 9-10, it can be seen that different proportions of water are added to the bottom slurry and the top slurry of the present invention to balance the density difference of different types of cellulose between the two layers, which is conducive to the fusion of the two slurries and makes the obtained cigarettes have higher sensory quality.

[0114] By comparing Application Example 1 with Application Examples 11-12, it can be seen that the present invention applies the upper layer of slurry a second time when the bottom slurry is baked to an appropriate moisture content, which is conducive to the fusion of the two slurries, ensures the actual adaptability of the core material, and makes the obtained cigarettes have higher sensory quality.

[0115] A comparison of Application Example 1 and Application Example 13 shows that the solid flavoring raw material of the present invention is pulverized under freezing conditions, which can effectively prevent the solid flavoring raw material from agglomerating due to mechanical friction, making the distribution of solid flavoring in the core material more uniform and effectively improving the sensory quality of heated cigarettes.

[0116] (3) By comparing Application Example 1 with Comparative Application Example 1-2, it can be seen that the present invention embeds the solid flavoring raw material in the upper and lower slurries through secondary coating, which effectively suppresses the escape of the solid flavoring raw material. The resulting flavored core material has higher sensory quality when applied to heated cigarettes.

[0117] (4) By comparing application example 1 with comparative application example 3, it can be seen that the present invention is prepared by embedding solid fragrance raw material in two layers of slurry. When the cigarette is heated and smoked, the solid fragrance raw material releases fragrance substances from the middle of the core material. Compared with the method of spraying fragrance, it can enhance the continuity, intensity and consistency of fragrance release, and has higher sensory quality.

[0118] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for preparing flavored cigarette core material, characterized in that, The preparation method includes the following steps: A bottom slurry is coated to form a wet film, a solid flavoring material is applied to the wet film, and then dried to obtain an intermediate film. Before applying the solid flavoring material, the solid flavoring material is pulverized in a cryogenic pulverizer and sieved. The pulverization temperature is -30~0 ℃. The wet film is dried until the surface moisture content of the wet film is 50~80%RH. An upper slurry is coated on the intermediate film and dried to obtain the flavored cigarette core material. The upper slurry is dried until the surface moisture content of the upper slurry is 3~10%RH. The bottom slurry comprises, by weight: 15-25 parts tobacco powder, 1-2 parts wood pulp fiber, 1-5 parts modified cellulose, 5-10 parts glycerol, and 40-60 parts water; the modified cellulose includes any one or a combination of at least two of carboxymethyl cellulose, hydroxypropyl methyl cellulose, or hydroxyethyl cellulose. The upper slurry comprises, by weight: 15-25 parts tobacco powder, 1-2 parts wood pulp fiber, 1-5 parts nanocellulose, 5-10 parts glycerol and 70-90 parts water; the nanocellulose includes cellulose nanocrystals and / or bacterial cellulose.

2. The preparation method according to claim 1, characterized in that, The method for preparing the wet film includes: casting the bottom slurry on a coating machine to obtain the wet film.

3. The preparation method according to claim 2, characterized in that, The height of the cast film is 0.4~0.6 mm.

4. The preparation method according to claim 2, characterized in that, The casting temperature is 65~75℃.

5. The preparation method according to claim 1, characterized in that, The particle size of the solid fragrance raw material is 150~250 mesh.

6. The preparation method according to claim 1, characterized in that, The solid fragrance raw materials include any one or a combination of at least two of menthol, vanillin, ethyl vanillin, maltol, ethyl maltol, or borneol.

7. The preparation method according to claim 1, characterized in that, The pulverization temperature is -30 to -20 ℃.

8. The preparation method according to claim 1, characterized in that, The method for applying the solid fragrance raw material includes: placing the solid fragrance raw material on a powder-sprinkling vibrating screen and sprinkling powder onto the bottom slurry.

9. The preparation method according to claim 8, characterized in that, The powder-spreading vibrating screen has a screen.

10. The preparation method according to claim 9, characterized in that, The sieve has an aperture of 150-250 mesh.

11. The preparation method according to claim 1, characterized in that, The amount of the solid fragrance raw material applied is 0.005~0.015 g / cm³. 2 .

12. The preparation method according to claim 1, characterized in that, The temperature for drying the wet film is 60~80℃.

13. The preparation method according to claim 1, characterized in that, The thickness of the upper slurry coating on the intermediate film is 0.4~0.6 mm.

14. The preparation method according to claim 1, characterized in that, The drying temperature of the upper slurry is 90~100℃.

15. The preparation method according to claim 1, characterized in that, The upper slurry is dried until the surface moisture content of the upper slurry is 5-7% RH.

16. The preparation method according to claim 1, characterized in that, The preparation method includes the following steps: (1) Provide a base slurry, wherein the base slurry comprises, by weight, 15-25 parts of tobacco powder, 1-2 parts of wood pulp fiber, 1-5 parts of modified cellulose, 5-10 parts of glycerol and 40-60 parts of water; The bottom slurry is cast on a coating machine to a height of 0.4~0.6 mm and a temperature of 65~75℃ to obtain a wet film. (2) Apply solid fragrance raw materials with a particle size of 150~250 mesh to the wet film obtained in step (1) through a powder-sprinkling vibrating screener, and dry at 60~80 ℃ until the surface moisture of the wet film is 50~80%RH to obtain an intermediate film; The amount of the solid fragrance raw material applied is 0.005~0.015 g / cm³. 2 Before applying the solid fragrance raw material, the solid fragrance raw material is pulverized in a cryogenic pulverizer and sieved. The pulverization temperature is -30~0 ℃. (3) Coat the upper slurry onto the intermediate film obtained in step (2) with a thickness of 0.4~0.6 mm, and then dry it at 90~100 ℃ until the surface moisture of the upper slurry is 3~10%RH to obtain the flavored cigarette core material; The upper slurry comprises, by weight, 15-25 parts tobacco powder, 1-2 parts wood pulp fiber, 1-5 parts nanocellulose, 5-10 parts glycerol and 70-90 parts water.

17. A flavored cigarette core material prepared by the preparation method according to any one of claims 1-16.

18. A heated cigarette, characterized in that, The raw materials for the heated cigarette include the flavored cigarette core material as described in claim 17.

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