Heating cigarette core material and preparation method and application thereof

Abstract

The invention provides a heating cigarette core material as well as a preparation method and application thereof. The heating cigarette core material is prepared from the following raw materials in parts by weight: 50 to 80 parts of tobacco leaf powder, 10 to 15 parts of tobacco slurry, 3 to 10 parts of tobacco flavor and 1 to 3 parts of adhesive. The core material provided by the invention does not contain exogenous fiber substances, so that the sensory negative breath caused by additional fibers is reduced, and the sensory smoking quality is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of the preparation of heated tobacco products, and particularly relates to a heated tobacco product core material, a preparation method thereof and an application, and more particularly to a heated tobacco product core material with good smoking quality, a preparation method thereof and an application. Background Art

[0002] Heated tobacco products are a new type of tobacco product that has emerged rapidly in recent years. Their main feature is that they use an external heat source to heat the tobacco rather than burning the tobacco, so that substances such as flavor components in the tobacco are released. Since the tobacco product is not directly burned, a large number of harmful components generated by pyrolysis due to high combustion temperature are avoided, reducing the harm to the human body while consumers obtain a sense of satisfaction, and reducing environmental pollution. Research results show that the aerosol released by heated tobacco products is more than 90% less harmful than the smoke of traditional cigarettes, and can provide a nicotine level basically equivalent to that of traditional cigarettes.

[0003] At present, the core material of heated tobacco products needs to go through processes such as coating, pre-pressing, drying, rolling, and slitting. This requires the tobacco sheet in the rolling process to have a certain tensile strength. Therefore, exogenous fiber materials must be added in the existing processing technology to enhance its tensile strength. For example, Patent CN111480877A discloses a preparation method of a heat-not-burn cigarette core material, including raw material pretreatment, mixing, and then steps such as cloth laying, pre-pressing, multi-stage fine pressing, drying, and rolling. The tensile strength is improved by adding fiber materials during the raw material mixing process; another example is a heat-not-burn cigarette core material and its preparation method disclosed in Patent CN107212467A. The core material contains the following raw materials in parts by weight: 5-30 parts of plant fiber, 40-85 parts of tobacco raw material, 5-40 parts of smoke generator, 0-20 parts of tobacco flavor, and 1-10 parts of auxiliary materials. Exogenous fibers (plant fibers) are also added to the core material to improve toughness, and the formed heat-not-burn cigarette core material has high loading performance through dry air forming technology.

[0004] However, the addition of the above-mentioned exogenous fiber materials restricts the usage amount of tobacco components on the one hand, resulting in weak release of effective smoke; on the other hand, it will bring bad miscellaneous odors such as woody odor during the smoking process of heated tobacco products, seriously affecting the sensory smoking quality. Therefore, how to provide a heated tobacco product core material that does not add exogenous fiber materials and has good smoking quality has become an urgent problem to be solved. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a heated tobacco product core material, a preparation method thereof and an application, and particularly to provide a heated tobacco product core material with good smoking quality, a preparation method thereof and an application. The core material provided by the present invention does not contain exogenous fiber materials, thereby reducing the sensory negative odor caused by the added fibers and improving the sensory smoking quality.

[0006] To achieve the object of the present invention, the following technical solutions are adopted in the present invention:

[0007] In a first aspect, the present invention provides a heat-not-burn cigarette core material. The raw materials for preparing the heat-not-burn cigarette core material include 50-80 parts by weight of tobacco leaf powder, 10-15 parts by weight of tobacco slurry, 3-10 parts by weight of tobacco flavor, and 1-3 parts by weight of adhesive.

[0008] The number of parts of the tobacco leaf powder can be 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or 85 parts, etc.; the number of parts of the tobacco slurry can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts, etc.; the number of parts of the tobacco flavor can be 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, etc.; the number of parts of the adhesive can be 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts, etc. However, it is not limited to the above-listed values, and other unlisted values within the above numerical range are equally applicable.

[0009] Currently, the core materials of mainstream heat-not-burn cigarettes usually use reconstituted tobacco. Reconstituted tobacco usually includes a smoking agent, an adhesive, essence and flavor, added fibers and well-mixed fine tobacco powder. It is made by the roll pressing method, the thick slurry method and the papermaking method. To ensure that the cigarette core has a certain tensile strength to meet the rolling requirements, a certain proportion of non-tobacco fibers need to be added, and the negative odor is relatively heavy during the smoking process. The above-mentioned specific heat-not-burn cigarette core material abandons the use of reconstituted tobacco as the core material. By using an adhesive to bond the tobacco leaf powder, tobacco slurry and tobacco flavor together, it is directly solidified and processed into a core material and used in cigarettes. There is no need to consider the problem of the tensile strength of reconstituted tobacco in the existing cigarette core preparation process, thereby avoiding the addition of exogenous fibers, effectively reducing the sensory negative odor caused by the added fibers, and improving the sensory smoking quality.

[0010] Preferably, the particle size of the tobacco leaf powder is 50-100 mesh, such as 50 mesh, 55 mesh, 60 mesh, 65 mesh, 70 mesh, 75 mesh, 80 mesh, 85 mesh, 90 mesh, 95 mesh or 100 mesh, etc. However, it is not limited to the above-listed values, and other unlisted values within the above numerical range are equally applicable.

[0011] The tobacco leaf powder with the above specific particle size can make the mixing more uniform, avoid too large gaps between tobacco shreds, and ensure that the heat is transferred more uniformly in the cigarette core rod.

[0012] Preferably, the beating degree of the tobacco slurry is 25-50°SR, such as 25°SR, 30°SR, 35°SR, 40°SR, 45°SR or 50°SR, etc. However, it is not limited to the above-listed values, and other unlisted values within the above numerical range are equally applicable.

[0013] The beating degree within the above specific range enables the tobacco stalk fibers to be cut while also undergoing fibrillation and fibrillation, increasing the bonding area between fibers, between fibers and the smoke agent, and between fibers and the swelling agent, thereby improving the mixing uniformity among various components, ensuring the consistency of the smoke during the suction process, and avoiding different suction tastes in the first few and last few puffs.

[0014] Preferably, the tobacco slurry includes 10-15 parts by weight of tobacco stalk powder, 20-30 parts of smoke agent, and 5-20 parts of swelling agent.

[0015] Among them, the number of parts of tobacco stalk powder can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts, etc.; the number of parts of the smoke agent can be 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts or 30 parts, etc.; the number of parts of the swelling agent can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts or 20 parts, etc., but is not limited to the values listed above, and other unlisted values within the above numerical range are equally applicable.

[0016] Preferably, the smoke agent includes any one or a combination of at least two of glycerol, propylene glycol, butylene glycol, trimethylolpropane, trimethylolethane, sorbitol, betaine, choline chloride or proline, preferably a combination of propylene glycol, glycerol and butylene glycol (the mass ratio can be (6-10):(0.5-2):(0.1-1.5)).

[0017] Since the heated cigarette generates an aerosol containing nicotine and other flavor components in a low-temperature non-combustion state to achieve the smoking effect, but the release of tobacco aroma components is difficult under low-temperature conditions, which easily leads to insufficient amounts of released aroma substances. Therefore, adding a smoke agent can ensure the release amount of smoke in the heated state of the cigarette product. The above specific smoke agent can destroy the cell wall structure of the tobacco leaves, making the aroma substances in the tobacco cells easier to penetrate and having a lower boiling point and being easily volatile. At the same time, when the smoke agent volatilizes, it can entrain the aroma substances to form an aerogel, promoting the release of aroma substances and improving the sensory suction quality.

[0018] Preferably, the swelling agent includes vermiculite and / or expandable graphite, preferably a combination of vermiculite and expandable graphite.

[0019] When a heated cigarette is heated, the tobacco components evaporate, cokerize, and carbonize, and as the temperature of the tobacco increases, the cigarette becomes softer, its hardness decreases, and the structure of the tobacco components wrapped by the cigarette paper will "collapse", causing the tobacco components, including the core material, to fall into the heating chamber, resulting in incomplete coking. The swelling agent will expand when heated during cigarette smoking. It can not only prevent the "collapse" caused by the thermal decomposition of the core material, but also make the cored cigarette that is solidified and compressed become a loose structure after its volume expands, providing a channel for the release of smoke and the conduction of heat, thereby further improving the smoking quality.

[0020] Vermiculite expands rapidly in volume during roasting, increasing by 6 - 15 times, and in some cases up to 30 times. By adding vermiculite to the core material of a heated cigarette in the present invention, the collapse of the cigarette core during the coking process can be effectively avoided, making the coking of the cigarette core more complete. Expandable graphite is a graphite intercalation compound with a special layered structure. When this graphite intercalation compound is rapidly heated at a high temperature, the tobacco raw materials, smoke agents, etc. decompose violently, generating a large amount of gas, causing the graphite to expand rapidly by dozens or even hundreds of times in the direction perpendicular to the layer plane. Adding it to the cigarette core can also effectively improve the collapse and make the coking of the cigarette core more complete. By compounding and synergistically using vermiculite and expandable graphite in the present invention, the structure of the core material can be effectively maintained, preventing "collapse", promoting the coking of the cigarette core, and at the same time effectively improving the sensory smoking quality.

[0021] Preferably, the adhesive includes any one or a combination of at least two of sodium alginate, sodium carboxymethylcellulose, chitosan, guar gum, or cellulose acetate, preferably a combination of sodium alginate, chitosan, and starch;

[0022] Preferably, the mass ratio of sodium alginate, chitosan, and starch is (1.6 - 2.5):(0.5 - 1.5):(0.5 - 1.5), where the number of parts of sodium alginate can be 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, or 2.5, etc., the number of parts of chitosan can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, or 1.5, etc., and the number of parts of starch can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, or 1.5, etc., but is not limited to the values listed above, and other unlisted values within the above numerical range are equally applicable.

[0023] Adding the above food-grade adhesive to the core material can ensure safety, non-toxicity, and no generation of foreign miscellaneous odors; in addition, these food-grade adhesives have rich hydroxyl, carboxyl and other groups on their surfaces, which can condense or bond with the oxygen-containing groups on the surface of tobacco leaves and tobacco stems, and then form a solid cigarette core with stable properties, convenient for storage and processing and shaping.

[0024] Meanwhile, the adhesive composed of specific sodium alginate, chitosan, and starch can effectively assist in the shaping of tobacco powder and other raw materials, strengthen the overall structural strength of the formed tobacco core, and reduce the structural loosening and "collapse" phenomena after heating. Additionally, both sodium alginate and chitosan have certain film-forming properties. After the tobacco core is formed, a certain film structure will be formed to coat the periphery of the tobacco core, which reduces the loss of volatile substances in the tobacco core and also reduces the occurrence of moisture absorption to a certain extent; chitosan has certain antibacterial properties, improving the smoking safety; starch can strengthen the structural strength between powders during the shaping process and also enhance the film-forming effect with chitosan. Since the high-temperature decomposition temperature of chitosan (above 150 °C) is higher than that of sodium alginate (around 80 °C), the film formed by sodium alginate degrades and breaks down rapidly in the initial stage of tobacco core heating, which not only ensures the draw resistance in the first few puffs but also avoids the inhibition of the film on the smoking effect, while chitosan and starch can continue to maintain a certain overall structural strength at a certain high temperature; in addition, by controlling the ratio among the three, large-area damage of the film can be achieved in the initial stage of heating, ensuring both the structural stability and the sensory effect of smoking.

[0025] In addition, the present invention also synergistically enhances the effects between the above-mentioned specific swelling agent and adhesive, which can effectively ensure that during the coking process of the tobacco core, the cut lamina filaments are bonded more tightly to each other and between the tobacco core and the inner wall of the cigarette rod, are not prone to filament dropping and core dropping, and reduce the black tobacco dust falling into the heated cigarette smoking device after smoking.

[0026] The types of tobacco flavors added in the present invention are not limited and can be any essence or plant extracts such as tobacco extracts, fruit extracts, etc. To make smoking healthier, natural plant extracts are preferred as the tobacco flavors. As a further aspect of the present invention: the tobacco flavors are one or more of flue-cured tobacco extracts, burley tobacco extracts, sun-cured tobacco extracts, Momordica grosvenori extracts, grape seed extracts, and apricot extracts, so as to ensure the presence of relatively rich nicotine and tobacco fragrance to enrich the aroma of the cigarette.

[0027] The tobacco leaf raw materials and tobacco stem raw materials in the present invention are common tobacco leaves and tobacco stems in cigarette processing. For example, the tobacco leaf raw materials can be one or more of flue-cured tobacco leaves, oriental tobacco leaves, burley tobacco leaves, and sun-cured tobacco leaves; the tobacco stem raw materials can be one or more of flue-cured tobacco stems, oriental tobacco stems, sun-cured tobacco stems, or burley tobacco stems.

[0028] In the second aspect, the present invention provides a method for preparing the heated cigarette core material as described above, and the preparation method includes the following steps:

[0029] Mix the tobacco leaf powder, tobacco slurry, tobacco flavor, and adhesive to obtain a paste, and then extrude and shape and dry to obtain the heated cigarette core material.

[0030] The above method does not require coating, pre-pressing, drying, rolling, slitting and other processes, and has no requirements on the tensile strength of the tobacco sheets. Therefore, the above heated cigarette core material can be prepared by combining specific raw materials in a simple way.

[0031] Preferably, the drying is performed to a moisture content of 6-10%, such as 6%, 7%, 8%, 9% or 10%, etc., but is not limited to the above-listed values, and other values ​​not listed within the above-listed range are also applicable.

[0032] Preferably, before mixing the tobacco leaf powder, tobacco slurry, tobacco flavoring and adhesive, the process also includes crushing the tobacco leaf raw material and the tobacco stem raw material separately to obtain tobacco leaf powder and tobacco stem powder; and mixing the tobacco stem powder, the smoke generating agent and the expander to obtain the tobacco slurry.

[0033] In a third aspect, the present invention also provides the use of the heated cigarette core material as described above in the preparation of heated cigarettes.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention utilizes the abundant hydroxyl, carboxyl and other groups on the surface of the adhesive to condense or bond with the oxygen-containing groups on the surface of tobacco leaves, tobacco stems and tobacco flavors to form an integrated core material with stable properties, easy to store and process, avoiding the requirement for tensile strength. Therefore, exogenous fibers do not need to be added to the raw materials, thereby reducing the negative sensory odor caused by the added fibers.

[0036] 2. The present invention not only increases the amount of smoke generated by adding a smoke generating agent and a swelling agent to the tobacco slurry, but also forms a loose structure in the core material through the expansion effect of the swelling agent during the smoking process, enriching the heat transfer channel while making it easier to release the smoke generated by the smoke generating agent, thereby enhancing the smoking experience.

[0037] 3. Since tobacco stems contain a large amount of tobacco fibers, in order to increase the bonding area between fibers, and between fibers and smoke-generating agents and expanders, the present invention mixes tobacco stem powder with smoke-generating agents and expanders, and then mixes them with tobacco leaf powder and tobacco flavorings, thereby improving the mixing uniformity between the components and ensuring the consistency of smoke before and after the sensory inhalation process.

[0038] 4. The present invention uses an extrusion molding process to process the paste formed by tobacco powder, tobacco slurry, tobacco flavoring and adhesive into an integrated structure, which does not require slitting and rolling processes, further avoiding the requirements of traditional tobacco sheets on tensile strength, thereby reducing the sensory negative smell brought by the added fiber and improving the smoking quality. DETAILED DESCRIPTION

[0039] To further illustrate the technical means and effects adopted by the present invention, the following further describes the technical solution of the present invention in conjunction with the preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0040] In the following examples, expandable graphite was purchased from Henan Liugong Graphite Co., Ltd., and the model was LG40;

[0041] Sodium carboxymethyl cellulose was purchased from Qingdao Mingyue Seaweed Group Co., Ltd.;

[0042] Chitosan was purchased from Shandong Luhailansheng Biotechnology Co., Ltd.;

[0043] Starch was purchased from Hebei Changrong Chemical Industry Co., Ltd.

[0044] In the following examples, the formula of the tobacco flavor is as follows (by weight):

[0045] 20.5 parts of Henan tobacco extract, 15 parts of light components separated from flue-cured tobacco, 10 parts of Yunnan tobacco leaf extract, 10 parts of Roman chamomile extract, 0.5 part of guaiacol, 0.3 part of furfural, 0.3 part of 2,3,5-trimethylpyrazine, 0.5 part of vanilla bean tincture, 0.2 part of vanillin, 0.2 part of isovaleric acid, 14 parts of propylene glycol, and 30 parts of 95% ethanol.

[0046] Example 1

[0047] This example provides a heating cigarette core material, and the usage amounts of the preparation raw materials are as follows:

[0048] 70 parts of tobacco leaf powder, 13 parts of tobacco slurry (containing tobacco stem powder, blowing agent (mass ratio of glycerol, propylene glycol, and butylene glycol is 8.5:1:0.5), vermiculite, and expandable graphite, and their weight ratio is 13:25:5:5), 5 parts of tobacco flavor, and 2 parts of adhesive (mass ratio of sodium alginate:chitosan:starch is 2:1:1).

[0049] The specific preparation method is as follows:

[0050] (1) Crush the tobacco leaf raw material and tobacco stem raw material respectively to obtain tobacco leaf powder (70 mesh) and tobacco stem powder;

[0051] (2) Mix water, tobacco stem powder, blowing agent, vermiculite, and expandable graphite to obtain tobacco slurry (beating degree is 30°SR);

[0052] (3) Mix the tobacco leaf powder, tobacco slurry, tobacco flavor, and adhesive to obtain a paste, and then extrude and dry it (to a water content of 8%) to obtain the heating cigarette core material.

[0053] Example 2

[0054] This embodiment provides a heated cigarette core material, and the usage amounts of the preparation raw materials are as follows:

[0055] 50 parts of tobacco leaf powder, 15 parts of tobacco pulp (including tobacco stalk powder, a fuming agent (glycerol, propylene glycol, and butanediol with a mass ratio of 6:0.5:0.1), vermiculite, and expandable graphite, and their weight ratio is 10:20:2:3), 3 parts of tobacco flavor, and 3 parts of adhesive (the mass ratio of sodium alginate:chitosan:starch is 1.6:1.5:0.5).

[0056] The specific preparation method is as follows:

[0057] (1) Crush the tobacco leaf raw material and the tobacco stalk raw material respectively to obtain tobacco leaf powder (50 mesh) and tobacco stalk powder;

[0058] (2) Mix water, tobacco stalk powder, fuming agent, vermiculite, and expandable graphite to obtain tobacco pulp (the beating degree is 25°SR);

[0059] (3) Mix the tobacco leaf powder, tobacco pulp, tobacco flavor, and adhesive to obtain a paste, and then extrude and mold and dry (to a water content of 6%) to obtain the heated cigarette core material.

[0060] Example 3

[0061] This embodiment provides a heated cigarette core material, and the usage amounts of the preparation raw materials are as follows:

[0062] 80 parts of tobacco leaf powder, 10 parts of tobacco pulp (including tobacco stalk powder, a fuming agent (glycerol, propylene glycol, and butanediol with a mass ratio of 10:2:1.5), vermiculite, and expandable graphite, and their weight ratio is 15:30:10:10), 10 parts of tobacco flavor, and 1 part of adhesive (the mass ratio of sodium alginate:chitosan:starch is 2.5:0.5:1.5).

[0063] The specific preparation method is as follows:

[0064] (1) Crush the tobacco leaf raw material and the tobacco stalk raw material respectively to obtain tobacco leaf powder (100 mesh) and tobacco stalk powder;

[0065] (2) Mix water, tobacco stalk powder, fuming agent, vermiculite, and expandable graphite to obtain tobacco pulp (the beating degree is 50°SR);

[0066] (3) Mix the tobacco leaf powder, tobacco pulp, tobacco flavor, and adhesive to obtain a paste, and then extrude and mold and dry (to a water content of 10%) to obtain the heated cigarette core material.

[0067] Example 4

[0068] This embodiment provides a heating cigarette core material. Except that vermiculite is not included in the preparation raw materials and part of the reduction is allocated to expandable graphite, the rest is the same as in Embodiment 1.

[0069] Embodiment 5

[0070] This embodiment provides a heating cigarette core material. Except that expandable graphite is not included in the preparation raw materials and part of the reduction is allocated to vermiculite, the rest is the same as in Embodiment 1.

[0071] Embodiment 6

[0072] This embodiment provides a heating cigarette core material. Except that propylene glycol is not included in the preparation raw materials and part of the reduction is proportionally allocated to glycerol and butanediol, the rest is the same as in Embodiment 1.

[0073] Embodiment 7

[0074] This embodiment provides a heating cigarette core material. Except that glycerol is not included in the preparation raw materials and part of the reduction is proportionally allocated to propylene glycol and butanediol, the rest is the same as in Embodiment 1.

[0075] Embodiment 8

[0076] This embodiment provides a heating cigarette core material. Except that butanediol is not included in the preparation raw materials and part of the reduction is proportionally allocated to glycerol and propylene glycol, the rest is the same as in Embodiment 1.

[0077] Embodiment 9

[0078] This embodiment provides a heating cigarette core material. Except that sodium alginate is not included in the preparation raw materials and part of the reduction is proportionally allocated to chitosan and starch, the rest is the same as in Embodiment 1.

[0079] Embodiment 10

[0080] This embodiment provides a heating cigarette core material. Except that chitosan is not included in the preparation raw materials and part of the reduction is proportionally allocated to sodium alginate and starch, the rest is the same as in Embodiment 1.

[0081] Embodiment 11

[0082] This embodiment provides a heating cigarette core material. Except that starch is not included in the preparation raw materials and part of the reduction is proportionally allocated to chitosan and sodium alginate, the rest is the same as in Embodiment 1.

[0083] Comparative Example 1

[0084] This comparative example provides a heating cigarette core material, and the amounts of the preparation raw materials are as follows:

[0085] 70 parts of tobacco leaf powder, 5 parts of tobacco stem powder, 24 parts of fuming agent (glycerol), 2 parts of wood fiber, 5 parts of tobacco flavor, and 2 parts of adhesive (carboxymethyl cellulose).

[0086] The specific preparation method is as follows:

[0087] (1) Crush the tobacco leaf raw material and tobacco stem raw material respectively to obtain tobacco leaf powder (70 mesh) and tobacco stem powder;

[0088] (2) Mix water, tobacco stem powder, fuming agent (glycerol), wood fiber, and adhesive to obtain tobacco slurry (beating degree is 50°SR);

[0089] (3) Mix the tobacco leaf powder, tobacco slurry, and tobacco flavor to obtain a paste, and then extrude and dry it (to a water content of 8%) to obtain the heated cigarette core material.

[0090] Comparative Example 2

[0091] This comparative example provides a heated cigarette core material. Except that the preparation raw materials do not include vermiculite and expandable graphite, and the reduced part is proportionally distributed to starch, chitosan, and sodium alginate, the rest is the same as in Example 1.

[0092] Comparative Example 3

[0093] This comparative example provides a heated cigarette core material. Except that the preparation raw materials do not include starch, chitosan, and sodium alginate, and the reduced part is proportionally distributed to vermiculite and expandable graphite, the rest is the same as in Example 1.

[0094] Effect test:

[0095] Make the heated cigarette core materials provided in Examples 1 - 11 and Comparative Examples 1 - 3 into heated cigarettes, and let professional personnel conduct suction evaluations and give evaluations (excellent if 18 points or above, good if 16 - 18 points, and general if below 16 points); use a suction machine to simulate the suction process, and count the amount of smoke generated and sensory characteristics; and observe the carbonization degree and appearance of the cigarette core after suction, as well as the situation of tobacco dust and the dropping of the cigarette core in the smoking device. The statistical results are as follows:

[0096]

[0097] From the above results, it can be found that the heated cigarette core material provided by the present invention has the advantages of high sensory smoking quality, less negative odor, and good smoking experience; by comparing Examples 1, 4 - 5, it can be found that by using the compounding and synergistic effect of vermiculite and expandable graphite, the present invention can effectively maintain the shape of the cigarette core, prevent collapse, make the cigarette core burn more completely, and improve the smoking quality; by comparing Examples 1, 6 - 8, it can be found that by using a specific fumigant, the present invention can effectively promote the release of aroma substances and improve the smoking quality; by comparing Examples 1, 9 - 11, it can be found that by using a specific adhesive, the present invention can effectively strengthen the structural strength and reduce the "collapse" phenomenon of the cigarette core structure; by comparing Example 1 with Comparative Examples 2 - 3, it can be found that by using the synergistic effect of a specific expander and adhesive, the present invention can effectively ensure that during the combustion of the cigarette core, the thin sheet filaments are bonded more tightly to each other and between the cigarette core and the inner wall of the cigarette stick, are not prone to filament dropping and core dropping, and reduce the amount of black tobacco dust left in the heated cigarette smoking device after smoking.

[0098] The applicant declares that the present invention uses the above - mentioned examples to illustrate the heated cigarette core material of the present invention and its preparation method and application, but the present invention is not limited to the above - mentioned examples, that is, it does not mean that the present invention must rely on the above - mentioned examples to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent replacement of each raw material of the product of the present invention, the addition of auxiliary components, and the selection of specific methods, etc., all fall within the protection scope and the disclosure scope of the present invention.

[0099] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above - mentioned embodiments. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0100] In addition, it should be noted that in the above - described specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

Claims

1. A heated cigarette core material, characterized in that: The raw materials for preparing the heated cigarette core material include, by weight, 50-80 parts of tobacco leaf powder, 10-15 parts of tobacco slurry, 3-10 parts of tobacco flavorings and 1-3 parts of adhesive.

2. The heated cigarette core material according to claim 1, characterized in that: The particle size of the tobacco leaf powder is 50-100 meshes.

3. The heated cigarette core material according to claim 1 or 2, characterized in that: The tobacco slurry has a beating degree of 25-50°SR.

4. The heated cigarette core material according to any one of claims 1 to 3, characterized in that: The tobacco slurry comprises, by weight, 10-15 parts of tobacco stem powder, 20-30 parts of smoke generating agent and 5-20 parts of expander.

5. The heated cigarette core material according to claim 4, characterized in that: The smoke generating agent comprises any one of glycerol, propylene glycol, butylene glycol, trimethylolpropane, trimethylolethane, sorbitol, betaine, choline chloride or proline or a combination of at least two thereof, preferably a combination of propylene glycol, glycerol and butylene glycol.

6. The heated cigarette core material according to claim 4 or 5, characterized in that: The expanding agent comprises vermiculite and / or expandable graphite, preferably a combination of vermiculite and expandable graphite.

7. The heated cigarette core material according to any one of claims 1 to 6, characterized in that: The adhesive comprises any one of sodium alginate, sodium carboxymethyl cellulose, chitosan, guar gum or cellulose acetate, or a combination of at least two thereof, preferably a combination of sodium alginate, chitosan and starch; Preferably, the mass ratio of sodium alginate, chitosan and starch is (1.6-2.5):(0.5-1.5):(0.5-1.5).

8. A method for preparing a heated cigarette core material according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: Tobacco leaf powder, tobacco slurry, tobacco flavoring and adhesive are mixed to obtain a paste, which is then extruded and dried to obtain the heated cigarette core material.

9. The preparation method according to claim 8, characterized in that: The drying process is performed to a moisture content of 6-10%; Preferably, before mixing the tobacco leaf powder, tobacco slurry, tobacco flavoring and adhesive, the process also includes crushing the tobacco leaf raw material and the tobacco stem raw material separately to obtain tobacco leaf powder and tobacco stem powder; and mixing the tobacco stem powder, the smoke generating agent and the expander to obtain the tobacco slurry.

10. Use of the heated cigarette core material according to any one of claims 1 to 7 in the preparation of heated cigarettes.

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