Tobacco particles, methods of making and use in smoking articles

Abstract

This invention discloses a tobacco granule, its preparation method, and its application, belonging to the field of cigarette material technology. The tobacco granule is prepared by compounding waste tobacco dust, Ophiopogon japonicus, and Pueraria lobata in a specific ratio, and simultaneously adding propylene glycol and glycerol to obtain granules with a rough surface and abundant pores. This invention utilizes waste tobacco dust, and the resulting granules can significantly reduce the irritation of cigarette smoke and increase its sweetness. During the cooling phase of heated cigarettes, it can simultaneously achieve cooling and aroma enhancement, effectively improving the problem of high smoke temperature and dryness in the first few puffs of heated cigarettes. Furthermore, the preparation process is simple and low-cost, achieving high-value utilization of waste resources. The tobacco granules of this invention can be used in traditional cigarette filters and heated cigarettes, offering multiple uses and strong applicability.

Description

Technical Field

[0001] This invention belongs to the field of cigarette material technology, specifically relating to a tobacco particle, its preparation method, and its application in cigarette products. Background Technology

[0002] Waste tobacco dust before flavoring refers to fine tobacco fragments with a diameter of 3 mm or less separated from raw tobacco leaves before the flavoring and flavoring processes in cigarette production. This tobacco dust is considered a byproduct or waste in the production process. It is usually only processed at low cost or even discarded directly, resulting in significant resource waste. How to effectively utilize this waste tobacco dust has long been a technical challenge in this field. While existing technologies include directly adding crushed tobacco waste to tobacco shreds or filter rods, this process easily generates dust and has limited functionality, leading to less than ideal practical application results.

[0003] Improving the sensory quality of traditional cigarettes has always been a key focus of industry research. Consumers have a continuously increasing demand for cigarette smoke with improved irritation, dryness, aftertaste purity, and sweetness. Another pressing challenge in this field is how to reduce smoke irritation and dryness while increasing sweetness and aroma richness, without introducing off-flavors or masking the natural tobacco aroma.

[0004] With the rapid development of new tobacco products, heated cigarettes (heated non-combustible cigarettes), as a novel tobacco product, provide tobacco aroma to consumers through heating rather than combustion, and have attracted market attention due to their lower release of harmful components. However, in actual use, heated cigarettes suffer from problems such as dry smoke, insufficient aroma, incomplete aroma characteristics, and slightly lacking taste. Especially during the first few puffs, the heating element heats up rapidly initially, resulting in significant water vapor evaporation, leading to high smoke temperature and poor aroma development, severely impacting the consumer's smoking experience and comfort. While existing technologies include cooling sections to lower smoke temperature, commonly used cooling materials (such as phase change materials and synthetic polymer particles) are mostly inert, only capable of cooling without enhancing aroma, and may even adsorb aroma components from the smoke, resulting in a situation of "cooling without enhancing aroma" or "enhancing aroma without cooling." How to simultaneously achieve cooling and aroma enhancement remains a long-standing unresolved technical challenge in this field. Summary of the Invention

[0005] This invention provides tobacco particles that can reduce the irritation of cigarette smoke and increase its sweetness, and can simultaneously achieve cooling and aroma enhancement during the cooling stage of heated cigarettes.

[0006] This invention provides tobacco pellets, which are made from the following raw materials by wet extrusion granulation and drying: waste tobacco powder, Ophiopogon japonicus powder, Pueraria lobata powder, propylene glycol and glycerol; wherein the waste tobacco powder is tobacco fragments with a particle size of 1-3 mm; and the tobacco pellets have a particle size of 1-2 mm.

[0007] Furthermore, the particle size of the waste tobacco powder, Ophiopogon japonicus powder, and kudzu root powder is 60-100 mesh.

[0008] Furthermore, by mass, the raw materials include: 10-80 parts waste tobacco powder, 10-50 parts Ophiopogon japonicus powder, 10-30 parts kudzu root powder, 5-15 parts propylene glycol, and 5-15 parts glycerol.

[0009] Furthermore, the mass ratio of the waste tobacco powder, Ophiopogon japonicus powder, and kudzu root powder is 5:3.5:2.

[0010] Furthermore, the surface of the tobacco particles has a rough, porous structure.

[0011] In another aspect, the present invention provides a method for preparing tobacco pellets, comprising the following steps:

[0012] S1 crushes and sieves waste tobacco dust, Ophiopogon japonicus, and kudzu root separately to obtain waste tobacco dust powder, Ophiopogon japonicus powder, and kudzu root powder; S2 mixes the waste tobacco powder, Ophiopogon japonicus powder, and Pueraria lobata powder, then adds propylene glycol and glycerol and mixes well. S3 uses wet extrusion granulation to obtain wet granules, which are then dried to obtain tobacco granules.

[0013] Further, in step S1, the waste tobacco dust, Ophiopogon japonicus, and kudzu root are crushed and passed through a 60-100 mesh sieve.

[0014] Further, in step S3, the wet mixture is processed into wet granules with a diameter of 1 to 2 mm by wet extrusion granulation.

[0015] Further, the wet particles are dried in an oven at 60–100°C for 5–30 minutes to obtain tobacco particles with a rough, porous surface.

[0016] In another aspect, the present invention provides an application of any of the above-mentioned tobacco particles in cigarette products.

[0017] For example, the present invention provides a cigarette filter rod comprising any of the above-mentioned tobacco particles.

[0018] Furthermore, the amount of tobacco particles added to the filter rod is 5–20 mg.

[0019] For example, the present invention provides a heated cigarette in which the tobacco section and / or cooling section contains any of the aforementioned tobacco particles.

[0020] Furthermore, the amount of tobacco particles used in the tobacco section is 0.18–0.25 g; the amount of tobacco particles used in the cooling section is 5–20 mg.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1) This invention is the first to use waste tobacco dust with a particle size of 1-3 mm before feeding as the main raw material, combined with Ophiopogon japonicus and Pueraria lobata to form a stable compound system, which transforms industrial waste into functional particles that can improve the quality of cigarettes, significantly increasing added value, reducing raw material waste and production costs, and is an innovative contribution to the resource utilization path of tobacco waste.

[0022] 2) In existing technologies, adding traditional Chinese medicinal herbs (such as Ophiopogon japonicus and Pueraria lobata) can achieve the effect of promoting saliva production and moisturizing the throat, but an overly strong medicinal flavor can affect the overall aroma harmony of cigarettes. In this invention, waste tobacco dust, Ophiopogon japonicus, and Pueraria lobata are compounded in a specific ratio, producing a synergistic effect: the tobacco aroma of the tobacco dust masks the bitterness of the traditional Chinese medicine, while the sweet and moisturizing components of Ophiopogon japonicus and Pueraria lobata neutralize the irritation and dryness of the smoke. Experimental data shows that, without adding any flavorings or flavor enhancers, it achieves increased aroma quantity, improved aroma richness, reduced irritation, weakened dryness, and significantly improved sweetness and aftertaste, solving the industry's long-standing pain point of relying on added flavorings to improve taste.

[0023] 3) The tobacco particles of the present invention have a particle size of 1-2 mm, a rough surface, and a porous structure with a large specific surface area, which allows for sufficient contact with the smoke. This not only adsorbs some harmful substances in the smoke and reduces irritation, but also adsorbs water vapor in the cooling section of the heated cigarette to reduce the temperature of the smoke at the beginning of smoking. At the same time, it slowly releases the aroma and sweetness of the smoke, achieving simultaneous cooling and aroma enhancement, thus breaking through the limitation of the single function of existing cooling materials.

[0024] 4) The process of this invention is simple, the equipment is highly versatile, the parameters are controllable, and the molding is stable. It does not require complex modification or extraction steps, and can be produced on a large scale in a continuous manner, making it highly practical.

[0025] 5) The invention has flexible application scenarios. The tobacco particles of the invention can be used simultaneously in traditional cigarette filters, heated cigarette tobacco sections, and heated cigarette cooling sections, making it multi-purpose and highly applicable, and comprehensively improving the smoking experience of both traditional cigarettes and new tobacco products. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 The smoke characteristics of a cigarette filter rod according to an embodiment of the present invention are shown; Figure 2 The aroma characteristics of a cigarette filter rod according to an embodiment of the present invention are shown; Figure 3 The characteristics of the smoke from heated cigarettes according to an embodiment of the present invention are shown; Figure 4 The aroma characteristics of heated cigarettes according to an embodiment of the present invention are shown; Figure 5 This invention illustrates the characteristics of smoke from heated cigarettes according to yet another embodiment of the invention; Figure 6 The aroma characteristics of heated cigarettes according to another embodiment of the present invention are shown. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Heated cigarettes are a new type of tobacco product that uses heat to bake the tobacco substrate, transferring the aroma of the baked tobacco to the consumer. However, they have drawbacks such as dry smoke, insufficient aroma, incomplete aroma characteristics, slightly lacking flavor, and high temperature in the first few puffs.

[0030] In existing technologies, adding traditional Chinese medicinal herbs (such as Ophiopogon japonicus and Pueraria lobata) can achieve the effect of promoting saliva production and moisturizing the throat. However, an excessively strong medicinal flavor can affect the overall aroma harmony of cigarettes, making it impossible to achieve natural aroma enhancement, reduce harshness, and sweetness solely through the synergistic effect of tobacco raw materials and medicinal and edible ingredients. Most of these methods require the addition of external flavorings, flavor enhancers, and taste correctors.

[0031] This invention provides a tobacco pellet composed of the following raw materials in parts by weight: 10-80 parts waste tobacco powder, 10-50 parts Ophiopogon japonicus powder, 10-30 parts Pueraria lobata powder, 5-15 parts propylene glycol, and 5-15 parts glycerol.

[0032] Humectants (such as propylene glycol and glycerol) can alleviate dryness to some extent, but they can easily produce off-flavors and mask the natural aroma of tobacco. Meanwhile, adding traditional Chinese medicinal herbs (such as Ophiopogon japonicus and Pueraria lobata) can promote saliva production and soothe the throat, but an overpowering medicinal flavor can affect the overall aroma harmony of the cigarette. In this embodiment of the invention, waste tobacco dust, Ophiopogon japonicus, and Pueraria lobata are combined, producing a synergistic effect: the tobacco aroma of the tobacco dust masks the bitterness of the herbs, while the sweet and moisturizing components of Ophiopogon japonicus and Pueraria lobata neutralize the irritation and dryness of the smoke, achieving a comprehensive effect of reducing irritation, increasing sweetness, and not overpowering the aroma. Without adding any flavorings, this invention achieves increased aroma quantity, enhanced aroma richness, reduced irritation, weakened dryness, and significantly improved sweetness and aftertaste.

[0033] In another embodiment, the waste tobacco dust is tobacco fragments with a particle size of 1-3 mm. The particle size of the waste tobacco dust powder, Ophiopogon japonicus powder, and Pueraria lobata powder is 60-100 mesh.

[0034] In another embodiment, the mass ratio of waste tobacco powder, Ophiopogon japonicus powder, and Pueraria lobata powder is 5:3.5:2.

[0035] In this invention, the inventors discovered that when the mass ratio of waste tobacco powder, Ophiopogon japonicus powder, and kudzu root powder is 5:3.5:2, the resulting tobacco particles have a better smoking effect when used in traditional cigarette filters, heated cigarette tobacco sections, and heated cigarette cooling sections.

[0036] In another embodiment, the tobacco pellets of the present invention are made from the following raw materials by wet extrusion granulation and drying: waste tobacco powder, Ophiopogon japonicus powder, Pueraria lobata powder, propylene glycol, and glycerol. The waste tobacco powder is tobacco fragments with a particle size of 1-3 mm.

[0037] In another embodiment, the particle size of the tobacco particles is 1 to 2 mm.

[0038] In another embodiment, the surface of the tobacco particles has a porous structure.

[0039] Although waste tobacco dust is a low-value waste, by compounding it with Ophiopogon japonicus and Pueraria lobata, and using propylene glycol and glycerol as granulation aids, and through wet extrusion granulation followed by drying, granules with sufficient strength (1-2 mm particle size, not easily broken) can be obtained without adding additional binders. Existing technologies generally tend to use waste tobacco dust as a filler in small amounts or discard it directly because its strength is too low and it is difficult to form directly. However, this invention uses it as the main material, achieving high-value utilization of waste resources, and has significant environmental and economic benefits.

[0040] Another embodiment provides a method for preparing tobacco pellets, which involves wet extruding and drying the following raw materials: waste tobacco powder, Ophiopogon japonicus powder, Pueraria lobata powder, propylene glycol, and glycerol.

[0041] The method includes the following steps: S1 crushes and sieves waste tobacco dust, Ophiopogon japonicus, and kudzu root separately to obtain waste tobacco dust powder, Ophiopogon japonicus powder, and kudzu root powder; S2 mixes the waste tobacco powder, Ophiopogon japonicus powder, and Pueraria lobata powder, then adds propylene glycol and glycerol and mixes well. S3 uses wet extrusion granulation to obtain wet granules, which are then dried to obtain tobacco granules.

[0042] In step S1, the waste tobacco dust consists of tobacco fragments with a particle size of 1-3 mm.

[0043] Waste tobacco dust, Ophiopogon japonicus, and kudzu root were crushed separately and passed through a 60-100 mesh sieve to obtain waste tobacco dust powder, Ophiopogon japonicus powder, and kudzu root powder with a particle size of 60-100 mesh, which were then set aside for use.

[0044] In step S2, the waste tobacco powder, Ophiopogon japonicus powder, and kudzu root powder are mixed; then propylene glycol and glycerol are added and mixed evenly to obtain a soft material.

[0045] In step S2, the raw materials are in the following weight proportions: 10-80 parts waste tobacco powder, 20-50 parts Ophiopogon japonicus powder, 10-30 parts kudzu root powder, 5-15 parts propylene glycol, and 5-15 parts glycerol.

[0046] In step S3, wet extrusion granulation is used to obtain wet granules, which are then dried to obtain tobacco granules.

[0047] The soft material obtained in step S2 is fed into a wet extrusion granulator. A sieve with a pore size of 1.5 mm is selected, and the grinding blade speed is set to 80 r / min. The equipment is started, and the wet mixture is forced through the sieve under the extrusion action of the grinding blade. After being extruded from the mesh, it forms columnar wet granules with a diameter of about 1.5 mm. The granules are then cut into short columnar wet granules with a length of about 2-3 mm by a cutting device.

[0048] The wet granules are transferred to an oven and dried at 60-100℃ for 5-30 minutes to obtain tobacco granules with a particle size of 1-2 mm and a rough, porous surface.

[0049] This invention employs a wet extrusion granulation process, which is simple and requires no complex equipment. Large-scale production can be achieved using conventional methods of crushing, mixing, extrusion granulation, and oven drying. Furthermore, this method uses the raw powder directly rather than extracts, preserving the natural aroma and sweetness of Ophiopogon japonicus and Pueraria lobata to the greatest extent possible. It also eliminates the need for other additives, avoiding the risks of component loss and solvent residue associated with extraction processes.

[0050] This invention transforms industrial waste into functional particles that can improve the quality of cigarettes, significantly increasing added value and reducing raw material waste and production costs.

[0051] Another embodiment provides the application of the tobacco particles of the present invention in cigarette products.

[0052] For example, a cigarette filter containing any of the tobacco particles mentioned above. The amount of tobacco particles added to the filter can be 5–20 mg.

[0053] For example, heated cigarettes containing any of the aforementioned tobacco particles. Any of the aforementioned tobacco particles may be included in the tobacco section and / or cooling section of the heated cigarette.

[0054] Tobacco particles are added to the tobacco segments of heated cigarettes, with the amount of tobacco particles being 0.18–0.25 g.

[0055] Tobacco particles are added during the cooling phase of heated cigarettes, with a dosage of 5–20 mg.

[0056] One of the fundamental reasons for the high temperature of the smoke in the first few puffs of heated cigarettes is the rapid evaporation of a large amount of water vapor. The tobacco particles of this invention, due to their rough and porous structure, can effectively adsorb this water vapor. When the water vapor condenses on the particle surface and within the pores, it releases latent heat of vaporization, which is absorbed by the particles, thus achieving cooling. Simultaneously, the adsorbed water vapor carries the sweet and moistening components of Ophiopogon japonicus and Pueraria lobata, as well as propylene glycol and glycerol, back into the subsequent smoke, thereby increasing the sweetness and aroma richness of the smoke.

[0057] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0058] Experiment 1 Tobacco Particles Raw material preparation: Take waste tobacco dust (particle size 1-3mm), dried Ophiopogon japonicus rhizomes, and dried Pueraria lobata rhizomes before feeding, and dry them in an oven at 60℃ until the moisture content is about 8%-10%. Crush the dried waste tobacco dust, Ophiopogon japonicus, and Pueraria lobata into powder using a pulverizer and pass them through a 60-mesh sieve to obtain waste tobacco dust powder, Ophiopogon japonicus powder, and Pueraria lobata powder.

[0059] Mixing steps: Weigh each raw material according to the following mass proportions, as shown in Table 1.

[0060] Place the weighed waste tobacco powder, Ophiopogon japonicus powder, and kudzu root powder into a mixer and mix thoroughly (about 10-15 minutes) to ensure that the three powders are evenly dispersed in a dry state.

[0061] Then add propylene glycol and glycerol, and continue mixing for about 15-20 minutes to ensure that the liquid evenly wets each powder particle, resulting in a wet mixture with moderate softness and no lumps.

[0062] Wet extrusion granulation: The wet mixture is transferred to a rotary extrusion pellet mill. A 1.5mm mesh screen is selected, and the grinding blade speed is set to 80r / min. The equipment is started, and the wet mixture is forced through the screen under the extrusion action of the grinding blade. After being extruded from the mesh, it forms columnar wet granules with a diameter of about 1.5mm. These are then cut into short columnar granules with a length of about 2-3mm by a cutting device.

[0063] dry: The prepared wet granules are evenly spread on a drying tray and placed in an oven at 80°C to dry for 20 minutes.

[0064] After drying, the granules are removed, cooled to room temperature, and sieved (through 10-mesh and 18-mesh sieves). Granules with a diameter of 1-2 mm are collected as the finished product. The tobacco granules obtained in Examples 1-6 and Comparative Examples 1-2 are light brown to yellowish-brown, with a rough and porous surface, a dry feel, and no lumps or adhesion.

[0065] Table 1. Raw material ratio of tobacco pellets

[0066] The particles prepared in Examples 1-6 and Comparative Examples 1-2 were applied to cigarette filter rods, with 10 mg of particulate material added per millimeter of cigarette filter rod to prepare experimental cigarettes. Sensory evaluation was conducted using cigarettes without the above-mentioned particles as a control.

[0067] Evaluation indicators include aroma characteristics (aroma quality, aroma quantity, off-flavors, and permeability), smoke characteristics (concentration, strength, smoothness, and cohesiveness), taste characteristics (irritation, dryness, aftertaste, and sweetness), and aroma style (fluffy, sweet, roasted, etc.). The scoring criteria are as follows: positive values ​​are used for indicators that have a positive effect compared to the reference cigarette; the greater the improvement, the higher the positive score. Negative values ​​are used for indicators that have a negative effect compared to the reference cigarette; the greater the negative effect, the higher the negative score. All indicators are scored in units of 1 point. The scores range from low to high: -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5. Evaluation teams were established according to the requirements of GB 5606.4. The final evaluation result is the average of the scores given by the sensory evaluators, accurate to 0.1. The evaluation results are shown in Table 2.

[0068] Table 2 Sensory Evaluation Results

[0069] As shown in Examples 1-6 and Comparative Examples 1-2, when tobacco particles composed of waste tobacco dust, Ophiopogon japonicus, and kudzu root are applied to cigarette filters, the smoking effect is significantly improved and the comfort is significantly enhanced. The inventors analyzed that this may be because waste tobacco dust, Ophiopogon japonicus, and kudzu root have a synergistic effect. The sweet and moist components of Ophiopogon japonicus and kudzu root neutralize the irritation and dryness of the smoke. While enhancing the sweetness and moistness, they also enhance the richness of the aroma, making the cigarette smoke aroma more penetrating. Tobacco particles with good smoking effect can be obtained without the addition of sweeteners or flavoring agents. When Ophiopogon japonicus or kudzu root is not added, the tobacco particles obtained when applied to cigarette filters have no obvious effect on improving the smoke state, the taste is relatively poor, and the enhancement of the richness of the smoke aroma is not obvious.

[0070] As can be seen from the comparison of Examples 4-6, when the mass ratio of waste tobacco dust, Ophiopogon japonicus and kudzu root is 5:3.5:2, the synergistic effect of the three is better, and the resulting tobacco particles have the best smoking effect when applied to cigarette filter rods.

[0071] Experiment 2: Cigarette Products Tobacco particles from Experiment 1, Example 3 were added to cigarette filter rods and heated cigarettes.

[0072] 10mg of granules was added to a traditional cigarette filter rod, and the sample was numbered 1#; 0.2g of granules was used alone as raw material for the tobacco section of heated cigarettes, and the sample was numbered 2#; 10mg of granules was added to the cooling section of heated cigarettes and used alone, and the sample was numbered 3#.

[0073] The samples were evaluated after equilibration under constant temperature and humidity conditions for 48 hours.

[0074] A scoring method was used to evaluate the characteristics and aroma style of the cigarette samples. Positive values ​​were assigned to indicators that showed a positive effect compared to the reference cigarettes; the greater the improvement, the higher the positive score. Negative values ​​were assigned to indicators that showed a negative effect compared to the reference cigarettes; the greater the negative effect, the higher the negative score. All indicators were scored in units of 1 point. The scores, from lowest to highest, were -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, and 5. Evaluation teams were established according to the requirements of GB 5606.4. The final evaluation result was the average of the scores given by the sensory evaluators, accurate to 0.1. The evaluation results are shown in Table 3 and [Table data missing]. Figures 1-6 .

[0075] Table 3. Cigarette Sample Characteristics and Aroma Style Scoring Results

[0076] The sensory evaluation results of sample #1 show that the addition of tobacco particles in this embodiment of the invention significantly improves the characteristics of smoke and aroma, increases the amount and richness of aroma, especially the sweet aroma, reduces irritation, increases sweetness and smoothness, and makes the smoke more delicate.

[0077] The sensory evaluation results of sample #2 show that using the tobacco particles of the present invention in the heated cigarette tobacco segment results in a richer aroma in the heated cigarette, especially with a significant increase in roasted and sweet aromas; the smoke is more diffused and delicate, and the sweetness is increased while reducing irritation.

[0078] The sensory evaluation results of sample #3 show that using the tobacco particles of the present invention in the cooling section of heated cigarettes increases the sweetness of heated cigarettes, reduces irritation, improves the smoke quality, enhances the richness of the smoke, and supplements the aroma.

[0079] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0080] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A type of tobacco pellet, characterized in that, It is composed of the following raw materials in parts by weight: 10-80 parts waste tobacco powder, 10-50 parts Ophiopogon japonicus powder, 10-30 parts Pueraria lobata powder, 5-15 parts propylene glycol, and 5-15 parts glycerol.

2. The tobacco pellets according to claim 1, characterized in that, The particle size of the waste tobacco powder, Ophiopogon japonicus powder, and kudzu root powder is 60-100 mesh.

3. The tobacco pellets according to claim 1, characterized in that, The tobacco particles are obtained by wet extrusion granulation and drying; the particle size of the tobacco particles is 1-2 mm.

4. The tobacco pellets according to claim 1, characterized in that, The mass ratio of the waste tobacco powder, Ophiopogon japonicus powder, and Pueraria lobata powder is 5:3.5:

2.

5. A method for preparing tobacco pellets according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. The waste tobacco dust, Ophiopogon japonicus and kudzu root are crushed and sieved to obtain waste tobacco dust powder, Ophiopogon japonicus powder and kudzu root powder respectively. S2. Mix the waste tobacco powder, Ophiopogon japonicus powder, and Pueraria lobata powder, then add propylene glycol and glycerol and mix well. S3. Wet extrusion granulation is used to obtain wet granules, which are then dried to obtain tobacco granules.

6. The preparation method according to claim 5, characterized in that, In step S1, waste tobacco dust, Ophiopogon japonicus, and kudzu root are crushed and passed through a 60-100 mesh sieve.

7. A cigarette filter rod, characterized in that, It includes the tobacco particles as described in any one of claims 1 to 4.

8. The cigarette filter rod according to claim 7, characterized in that, The amount of tobacco particles added to the filter rod is 5-20 mg.

9. A heated cigarette, characterized in that, Its tobacco section and / or cooling section contain tobacco particles as described in any one of claims 1 to 4.

10. The heated cigarette according to claim 9, characterized in that, The amount of tobacco particles used in the tobacco section is 0.18–0.25 g; the amount of tobacco particles used in the cooling section is 5–20 mg.

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