A method for preparing tree moss style reconstituted tobacco leaf

Abstract

The application discloses a preparation method of tree moss style reconstituted tobacco leaf, which takes filamentous reconstituted tobacco leaf as a base body, and dissolves and emulsifies tree moss extract into water-soluble microemulsion base through non-alcohol auxiliary solvent to form a stable water phase base together with water-soluble tobacco extract and water-soluble tobacco flavor; the flavor is fully penetrated and uniformly adsorbed through closed balance after fine atomization spraying and dynamic tumbling loading at room temperature. The application effectively solves the problems of tree moss extract, such as water insolubility, incapability of being compounded with water-soluble flavor, poor safety of traditional alcohol-soluble system, thermal degradation of aroma caused by high temperature, and weak aroma retention of filamentous reconstituted tobacco leaf, and the prepared product has the advantages of prominent tree moss characteristics, harmonious and full aroma, long-lasting aroma retention, low miscellaneous gas and irritancy, and excellent sensory quality; the process is safe and controllable, has strong applicability, is suitable for industrial production, can significantly improve the style differentiation and sensory quality of cigarettes, and has good popularization value.

Description

Technical Field

[0001] This invention relates to the field of papermaking reconstituted tobacco production technology, and particularly to a method for preparing tree moss-style reconstituted tobacco. Background Technology

[0002] Reconstituted tobacco produced by papermaking uses tobacco by-products such as tobacco stems, tobacco dust, and broken tobacco leaves as raw materials. It is processed through extraction, solid-liquid separation, pulping, papermaking, and drying. It boasts advantages such as stable smoke release, excellent filling properties, and low tar and harmful component release, making it a core functional raw material for reducing harm and tar in Chinese-style cigarettes and stabilizing their quality. Shredded reconstituted tobacco, due to its close resemblance to natural tobacco shreds, high mixing uniformity, good combustion synchronization, and superior sensory harmony, is increasingly widely used in high-end cigarette formulations.

[0003] Tree moss extract, a classic and precious natural flavoring in the tobacco industry, possesses a unique mossy, paste-like, woody sweetness and a mellow smoky base, which highly matches the natural aroma of tobacco and can significantly enhance the aroma layers, style recognition, and smoking comfort of cigarettes. However, when applying tree moss extract to papermaking filament reconstituted tobacco leaves, existing technologies face significant bottlenecks: tree moss extract is a highly fat-soluble substance, insoluble in water, and difficult to disperse evenly in aqueous systems; the industry commonly uses alcohol solvents such as ethanol to dissolve and spray it, which can improve solubility, but has drawbacks such as flammability and explosiveness, poor safety, rapid volatilization, uneven aroma distribution, easy abrupt irritation, loss of minor components, incomplete style, and short aroma retention. Using tree moss extract alone can easily result in a thin aroma, insufficient integration with the natural tobacco aroma, and poor thickness and harmony in the smoke. It needs to be combined with water-soluble tobacco extract to complement and enhance the aroma. However, fat-soluble tree moss extract and water-soluble fragrance cannot be directly miscible, which can easily lead to phase separation, system instability, and difficulty in forming a uniformly sprayable aqueous system. At the same time, filamentous reconstituted tobacco leaves have a large specific surface area and a loose structure. After being shredded, they lose the aroma-locking effect of the coating layer. The fibers mainly adsorb fragrance on the surface with weak physical properties, resulting in a weak aroma retention capacity. Conventional flavoring methods can easily lead to significant volatilization, migration, and loss of fragrance. In addition, tree moss fragrance has poor thermal stability. Conventional high-temperature drying can easily cause thermal degradation of aroma, style drift, and the generation of irritating off-flavors.

[0004] Currently, the industry lacks an integrated style-building technology that can simultaneously achieve water-soluble stabilization of tree moss, homogenization of its blend with water-soluble tobacco flavorings, compatibility with filamentous reconstituted tobacco leaves, and safe, stable, and continuous production. This severely restricts the large-scale, high-quality production of tree moss-style reconstituted tobacco leaves. Therefore, developing a non-alcohol-soluble, water-soluble, blendable, uniformly loaded, long-lasting aroma, and highly safe method for preparing tree moss-style reconstituted tobacco leaves is of significant practical importance for enriching product categories and enhancing cigarette style differentiation. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a method for preparing tree moss-style reconstituted tobacco leaves. Addressing the problems of tree moss extract being insoluble in water, unable to stably blend with water-soluble tobacco extracts, poor safety of alcohol-soluble spraying systems, easy aroma evaporation, uneven distribution, poor thermal stability, difficulty in maintaining stable style, and insufficient harmony, this application presents an integrated preparation method that combines solubilization with co-solventization, composite emulsification stabilization, synergistic blending with water-soluble flavorings, fiber interface affinity, and low-temperature gradient aroma preservation. This method achieves efficient fusion, uniform loading, stable release, long-lasting aroma, typical style, and excellent harmony between tree moss aroma and the natural aroma of tobacco, while ensuring that the physical properties and sensory quality of the product fully meet the requirements for cigarette use.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solution:

[0007] This invention employs a synergistic approach of non-alcoholic cosolvent solubilization, compound emulsifier interface activation, and high-speed shearing to construct an oil-in-water microemulsion system for tree moss extract. This allows the tree moss extract to be stably dispersed in a continuous aqueous phase in the form of nano-sized droplets, achieving thermodynamically stable dispersion of the fat-soluble tree moss extract in the aqueous phase.

[0008] A method for preparing tree moss-style reconstituted tobacco leaves includes the following steps:

[0009] (1) Raw material preparation: Weigh the water-soluble compound flavor base and the flavoring base. The mass ratio of the water-soluble compound flavor base to the flavoring base is (0.5~2.0):100. The flavoring base is papermaking filament reconstituted tobacco leaves. The water-soluble compound flavor base includes the following components by mass: tree moss extract 2.5%~10.0%, water-soluble tobacco extract 0.01%~0.05%, water-soluble tobacco flavoring 0.02%~0.05%, and the balance is non-alcoholic solubilizer, emulsifier and deionized water;

[0010] (2) Preparation of water-soluble tree moss micro-boss base: The tree moss extract and non-alcoholic cosolvent were mixed at a mass ratio of 1:3 to 1:6 and added to a constant temperature mixing tank. The mixture was stirred at 40 to 55°C for 10 to 20 minutes until the tree moss extract was completely dissolved and a homogeneous transparent oil phase was formed. An emulsifier was added at a mass ratio of tree moss extract to emulsifier of 1:0.5 to 1:2. The mixture was stirred at a constant temperature for 5 to 10 minutes to fully disperse the emulsifier and complete the interface activation. Deionized water was added while stirring at 8000 to 12000 r / min. High-speed shear emulsification for 8–15 min yields a thermodynamically stable oil-in-water water-soluble tree moss microemulsion base. In this microemulsion base, tree moss extract is dispersed in a continuous aqueous phase as nano-sized droplets. After cooling to room temperature and standing for 24 h, no stratification or floating oil is observed. Unlike conventional dispersions (kinetically stable systems maintained only by thickeners or stabilizers), the microemulsion of this invention is a thermodynamically stable system that can maintain a uniform and transparent state for a long time without the addition of external stabilizers. Unlike microcapsules (solid particles of fragrance encapsulated by a wall material that require combustion to break the cell wall for release), the tree moss extract in the microemulsion of this invention is directly dispersed in the aqueous phase as nano-sized droplets, allowing for immediate and sufficient release of aroma on the surface of tobacco.

[0011] (3) Preparation of water-soluble compound fragrance base: Add water-soluble tobacco extract and water-soluble tobacco flavoring to the mixing tank, add deionized water and mix and stir for 5-10 min to form an aqueous fragrance liquid; under low speed stirring conditions, dropwise add the aqueous fragrance liquid to the water-soluble tree moss micro-lacquer base, continue stirring for 10-15 min to obtain the water-soluble compound fragrance base, filter it through a filter screen and set it aside;

[0012] (4) Room temperature fine atomization spraying load: The filamentous reconstituted tobacco leaves are placed in a dynamic tumbling spraying device, and water-soluble compound flavor base is sprayed onto the filamentous reconstituted tobacco leaves at room temperature and pressure using an ultrasonic fine atomization nozzle. The droplet size is controlled at 20-50μm. After spraying, continue to tumble and stir for 20-30 minutes. The spraying is carried out under room temperature and pressure conditions and does not involve heating atomization.

[0013] (5) Closed balancing treatment: After spraying, the filamentous reconstituted tobacco leaves are transferred to a closed balancing chamber and left to stand for balancing for 2-4 hours under normal temperature and light-proof conditions to obtain tree moss-style reconstituted tobacco leaves.

[0014] Preferably, in the above technical solution, the non-alcoholic cosolvent is propylene glycol or glycerol; the emulsifier is Tween-80 and / or sucrose fatty acid ester.

[0015] Preferably, in the above technical solution, in step (2), the temperature of the constant temperature mixing tank is 50°C, the high-speed shear emulsification speed is 10000r / min, and the shear emulsification time is 10min.

[0016] Preferably, in the above technical solution, in step (4), the amount of water-soluble compound flavor base sprayed is 1.0% of the mass of the filamentous reconstituted tobacco leaves; the tumbling and stirring time after spraying is 30 min.

[0017] Preferably, in the above technical solution, in step (5), the sealed equilibrium standing time is 3 hours; the method does not include a heating and drying step above 60°C.

[0018] Preferably, in the above technical solution, the non-alcoholic cosolvent and the compound emulsifier are both tobacco grade or food grade.

[0019] A tree-moss-style reconstituted tobacco leaf prepared by the above preparation method, wherein the total retention rate of tree-moss characteristic components in the reconstituted tobacco leaf is ≥90%.

[0020] The above-described technical solution of the present invention has the following beneficial effects:

[0021] (1) By using a synergistic approach of non-alcoholic solubilizers, compound emulsifiers, interface activation, and high-speed shearing, the fat-soluble tree moss extract is constructed into a thermodynamically stable oil-in-water microemulsion system. This allows the tree moss extract to be stably dispersed in the aqueous phase in the form of nano-droplets for a long time. After standing for 24 hours, there is no layering or floating oil. It can be uniformly compounded with water-soluble tobacco extracts and water-soluble tobacco flavorings. This completely solves the problems of tree moss extract being insoluble in water, easily layering and floating oil, being unable to be used with water-soluble flavorings, and being flammable and explosive in alcohol-soluble systems. The system has strong stability and high safety, meeting the requirements of atomized spraying and continuous industrial production.

[0022] (2) The use of room temperature fine atomization spraying combined with a closed balance process does not involve heating treatment throughout the process, which can maximize the retention of heat-sensitive aroma components in tree moss extract and avoid aroma thermal degradation and style drift. At the same time, it effectively improves the adsorption uniformity and fixation strength of fragrance on the surface of filamentous reconstituted tobacco leaves, and improves the problems of easy volatilization, easy migration and short fragrance retention caused by its large specific surface area and loose structure, so that the product aroma is long-lasting and stable and the characteristic style is prominent.

[0023] (3) Tree moss extract provides characteristic aroma, while water-soluble tobacco extract enhances the natural aroma of tobacco, improves the thickness and harmony of the smoke. The synergistic effect of the two makes the overall aroma natural and full, the smoke delicate and soft, the irritation and impurities significantly reduced, and the aftertaste clean and comfortable. The tree moss style reconstituted tobacco leaves can significantly improve the sensory quality and style recognition of cigarettes. The process is simple and controllable, and has strong applicability, making it of good promotional value. Detailed Implementation

[0024] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0025] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the materials and reagents used are commercially available. Unless otherwise specified, the equipment used in the experiments is well known to those skilled in the art.

[0026] Example 1

[0027] (1) Raw material preparation

[0028] Filament-like reconstituted tobacco leaves that meet the industry standards for papermaking reconstituted tobacco leaves are selected as the flavoring base. The raw materials are free from mold, impurities, and off-odors. Tree moss extract, water-soluble tobacco extract, and water-soluble tobacco flavoring are accurately weighed, and each flavoring meets the standards for tobacco additives. Propylene glycol, glycerin, Tween-80, sucrose fatty acid ester, and deionized water are also weighed. All excipients are food-grade or tobacco-grade, clean, and free of impurities. Accurately weigh each component according to the formula: 100.0 kg of filamentous reconstituted tobacco leaves, total spray amount of water-soluble compound flavoring base: 1.0 kg (accounting for 1.0% of filamentous reconstituted tobacco leaves), including 0.025 kg of tree moss extract (accounting for 2.5% of flavoring base mass), 0.0001 kg of water-soluble tobacco extract, 0.0002 kg of water-soluble tobacco flavoring, 0.075 kg of propylene glycol, 0.0125 kg of Tween-80, and deionized water to make up to 1.0 kg of total flavoring base mass; all flavorings and excipients are tobacco grade or food grade, clean and free of impurities, and should be sorted and set aside after weighing.

[0029] (2) Preparation of water-soluble styrax base

[0030] The weighed tree moss extract and propylene glycol were added to a constant-temperature mixing tank. The stirring device was turned on, the temperature was raised to 50°C, and the mixture was stirred at a constant temperature for 10 minutes to completely dissolve the tree moss extract and form a homogeneous transparent oil phase solution. Tween-80 was added to the system, and the mixture was stirred at a constant temperature of 50°C for 5 minutes to fully disperse the emulsifier and complete the interface activation. Under continuous stirring, deionized water was slowly added to the system in a thin stream. Then, a high-speed shear machine was turned on and the rotation speed was controlled at 10,000 r / min for shearing and emulsification for 10 minutes to obtain a transparent to semi-transparent water-soluble tree moss micro-boswellic acid base. After cooling to room temperature and standing for 24 hours, there was no stratification or floating oil, and it can be directly used for atomized spraying.

[0031] (3) Preparation of water-soluble compound fragrance base

[0032] Add water-soluble tobacco extract and water-soluble tobacco flavoring to another mixing tank, add an appropriate amount of deionized water, and start low-speed stirring for 5 minutes until the materials are completely dissolved to form a homogeneous aqueous flavoring liquid. Under low-speed stirring conditions, slowly and evenly add the above aqueous flavoring liquid to the prepared water-soluble tree moss micro-mastillary base. After the addition is completed, continue stirring for 15 minutes to ensure that the components are fully mixed and stable, forming a homogeneous, clear, water-soluble compound flavoring base that can be directly used for atomized spraying. Before use, filter with a 200-mesh filter to remove mechanical impurities and ensure smooth spraying without clogging the nozzle.

[0033] (4) Room temperature fine atomization spray load

[0034] The shredded reconstituted tobacco leaves are evenly conveyed to a continuous dynamic tumbling spraying device, ensuring that the tobacco shreds are fully dispersed and do not clump during the spraying process. The filtered water-soluble compound flavoring base is introduced into the spraying system, and ultrasonic fine atomizing nozzles are used to control the droplet size to 20-50μm, and the spraying is carried out evenly under normal temperature and pressure conditions. Through frequency conversion speed regulation and flow closed-loop control, the spraying amount is precisely controlled to 1.0% of the mass of the shredded reconstituted tobacco leaves, allowing the flavoring base to fully penetrate into the internal pores of the tobacco shreds. After spraying, the tobacco shreds are tumbled and stirred for another 30 minutes to ensure that the tobacco shreds are free of clumping and uneven in moisture content.

[0035] 5. Sealed Balance Treatment

[0036] After the aromatic reconstituted tobacco leaves have been sprayed and flavored, they are quickly transferred to a sealed balancing chamber and left to stand and balance for 3 hours in a clean, dark, and dark environment. This allows the flavoring to fully penetrate, be absorbed, and be stably distributed on the surface and inside the pores of the tobacco leaves, ensuring a uniform aroma and no free liquid. After balancing, the tobacco leaves are discharged, resulting in reconstituted tobacco leaves with a typical tree moss style, harmonious aroma, and excellent sensory quality.

[0037] Example 2

[0038] The only difference from Example 1 is that: the total spray amount of water-soluble compound flavor base is 1.5% of the mass of filamentous reconstituted tobacco leaves; tree moss extract accounts for 5.0% of the total mass of flavor base, water-soluble tobacco extract accounts for 0.03% of the total mass of flavor base, and water-soluble tobacco flavoring accounts for 0.03% of the total mass of flavor base; the compound emulsifier is Tween-80 + sucrose fatty acid ester.

[0039] Example 3

[0040] The only difference from Example 1 is that: the total spray amount of water-soluble compound flavor base is 2.0% of the mass of filamentous reconstituted tobacco leaves; tree moss extract accounts for 10.0% of the total mass of flavor base, water-soluble tobacco extract accounts for 0.05% of the total mass of flavor base, and water-soluble tobacco flavoring accounts for 0.05% of the total mass of flavor base; glycerol is used as the cosolvent, the high-speed shear speed is 12000 r / min, the emulsification time is 8 min, and the closed equilibrium time is 4 h.

[0041] Comparative Example 1 (Unemulsified, directly mixed with water)

[0042] The only difference from Example 1 is that no emulsification and solubilization treatment was performed. The tree moss extract was directly mixed and stirred with water and water-soluble tobacco extract. As a result, obvious oil-water separation, floating oil, and flocculation occurred, and it could not be sprayed evenly.

[0043] Comparative Example 2 (Ethanol-soluble system)

[0044] The only difference from Example 1 is that: the tree moss extract was dissolved in ethanol and then sprayed, and no non-alcoholic cosolvent or emulsification system was used. The mass ratio of ethanol to tree moss extract was 5:1.

[0045] Comparative Example 3 (with only tree moss extract, no tobacco extract)

[0046] The only difference from Example 1 is that no water-soluble tobacco extract or water-soluble tobacco flavoring is added, and only the same amount of tree moss extract is applied.

[0047] Comparative Example 4 (High-Temperature Drying Instead of Sealed Equilibrium)

[0048] The only difference from Example 1 is that hot air drying at 85-95°C is used after spraying, instead of room temperature closed equilibrium treatment.

[0049] Comparative Example 5 (Dispersion instead of microemulsion)

[0050] The only difference from Example 1 is that a conventional dispersion method (stirring and homogenizing after adding a stabilizer) is used instead of the microemulsion preparation process of the present invention, while the other parameters remain unchanged.

[0051] Effect detection:

[0052] 1. Sensory evaluation and absorption measurement

[0053] The filamentous reconstituted tobacco leaf samples obtained in Examples 1-3 and Comparative Examples 1-5 were made into test cigarettes according to the cigarette formula process. They were equilibrated for 48 h in a constant temperature and humidity environment of (22±2)℃ and (60±5)% relative humidity. Subsequently, seven professionals with national tobacco product sensory evaluation qualifications conducted sensory quality evaluation according to GB / T 16447—2021. The evaluation indicators included moss characteristics (20 points), aroma harmony (20 points), aroma sufficiency and lingering aroma (20 points), off-flavors (15 points), irritation (15 points), and aftertaste (10 points). The scores were given on a 100-point scale, and the average value of the results is shown in Table 1.

[0054] Table 1 Sensory evaluation results (unit: points)

[0055]

[0056] As shown in Table 1, the total sensory scores of Examples 1-3 were all above 90 points, significantly better than the comparative examples. Examples 1-3 exhibited prominent tree moss characteristics, a harmonious and full aroma, low levels of off-odors and irritation, and a clean aftertaste. This was mainly because Examples 1-3 used compound emulsification to achieve stable water-soluble dispersion of the tree moss extract, combined with water-soluble tobacco extract for synergistic aroma harmonization. Room temperature fine atomization and a closed-loop balance ensured uniform adsorption of the fragrance, and the entire process avoided high-temperature damage to the aroma, resulting in the best sensory quality. Comparative Example 1, due to the lack of emulsification, experienced separation of the fragrance base oil and water, uneven fragrance addition, leading to large aroma fluctuations and poor harmony. Comparative Example 2 uses ethanol for dissolution, resulting in rapid solvent evaporation, easy loss of aroma, increased irritation, and shorter aroma retention. Comparative Example 3 does not contain water-soluble tobacco extract, failing to create a harmonious and complementary aroma with the tree moss extract, exhibiting only a single tree moss aroma with a thin and lacking complexity, thus resulting in a low sensory score. Comparative Example 4 undergoes high-temperature drying, leading to degradation of the heat-sensitive aroma of the tree moss and the generation of off-odors, significantly reducing sensory quality. Comparative Example 5 uses a conventional dispersion method (adding a stabilizer and then stirring for homogenization) instead of the microemulsification preparation process of this invention, resulting in a total sensory evaluation score of only 71.0 points. Although the conventional dispersion method improves the short-term dispersibility of the tree moss extract to some extent through stabilizers and homogenization treatment, showing some improvement compared to the completely unemulsified Comparative Example 1, since this dispersion system is only a kinetically stable system, layering and oil floating still occur after standing. In actual spraying, the aroma base is already uneven, resulting in tree moss characteristics, aroma harmony, and aroma retention that are far inferior to the embodiments of this invention. This indicates that conventional dispersion methods cannot fundamentally solve the problem of stable dispersion of tree moss extract in the aqueous phase. Only the thermodynamically stable oil-in-water microemulsion system constructed by this invention can achieve long-term stable dispersion and uniform loading of tree moss extract.

[0057] 2. Determination of the retention rate of characteristic aroma components in tree moss

[0058] Headspace gas chromatography / mass spectrometry (HS–GC / MS) was used to quantitatively detect key characteristic components of tree moss, including methyl β-mossin carboxylate, ethyl mossin carboxylate, ethyl erythrophyllate, ethyl arbutinate, methyl arbutinate, and monomethyl mossin ether, in the filamentous reconstituted tobacco leaf samples of Examples 1–3 and Comparative Examples 1–5. The retention rates of each component and the total retention rate of characteristic components were calculated, and the results are shown in Table 2.

[0059] Table 2 Comparison of retention rates of characteristic aroma components in tree moss (unit: %)

[0060]

[0061] As shown in Table 2, Examples 1-3 exhibit high retention rates of each characteristic component, with a total retention rate of 91.5%-93.5%, demonstrating excellent aroma preservation. This is mainly due to the fact that room-temperature atomized spraying avoids aroma volatilization, the sealed balance promotes stable adsorption of fragrances, and the absence of high-temperature treatment throughout the process maximizes the protection of the heat-sensitive components of the tree moss. Comparative Example 1 suffers from system instability due to lack of emulsification, resulting in uneven fragrance distribution and significant component loss. Comparative Example 2 uses ethanol for dissolution, leading to easy evaporation and loss of light components, resulting in a significant reduction in retention rate. Comparative Example 3 does not contain water-soluble tobacco extract, exhibiting only a single tree moss aroma, lacking the support and harmony of tobacco's inherent fragrance, resulting in a thin aroma and poor coordination. However, this does not affect the retention of the tree moss characteristic components, thus maintaining a relatively high retention rate. Comparative Example 4, after high-temperature drying, suffers from severe thermal degradation of the tree moss characteristic components, with a retention rate of only 45.3%, exhibiting the worst aroma preservation effect. Comparative Example 5 uses a conventional dispersion method, achieving a total retention rate of 80.0% for the tree moss characteristic components, which, although slightly improved compared to Comparative Example 1, is still significantly lower than the examples of this invention. The retention rates of each individual component were significantly lower than in Example 1. This is because conventional dispersion methods only produce kinetically stable systems. After standing, the moss extract gradually aggregates and separates, resulting in uneven distribution of active ingredients during spraying and loading. Consequently, a large number of moss characteristic components cannot be effectively adsorbed onto the tobacco surface during spraying and equilibration. In contrast, this invention utilizes a water-in-oil microemulsion system constructed through non-alcoholic solubilization, interface activation with compound emulsifiers, and high-speed shearing. This allows the moss extract to be thermodynamically and stably dispersed in a continuous aqueous phase in the form of nano-droplets, achieving uniform loading and efficient retention of flavorings on the tobacco surface.

[0062] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various different choices and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. A method for preparing tree moss-style reconstituted tobacco leaves, characterized in that, Includes the following steps: (1) Raw material preparation: Weigh the water-soluble compound flavor base and the flavoring base. The mass ratio of the water-soluble compound flavor base to the flavoring base is (0.5~2.0):

100. The flavoring base is papermaking filament reconstituted tobacco leaves. The water-soluble compound flavor base includes the following components by mass: tree moss extract 2.5%~10.0%, water-soluble tobacco extract 0.01%~0.05%, water-soluble tobacco flavoring 0.02%~0.05%, and the balance is non-alcoholic solubilizer, emulsifier and deionized water; (2) Preparation of water-soluble tree moss micro-boss base: Tree moss extract and non-alcoholic co-solvent are mixed at a mass ratio of 1:3 to 1:6 and added to a constant temperature mixing tank. The mixture is stirred at 40 to 55°C for 10 to 20 minutes until the tree moss extract is completely dissolved and a homogeneous transparent oil phase is formed. An emulsifier is added at a mass ratio of tree moss extract to emulsifier of 1:0.5 to 1:

2. The mixture is stirred at a constant temperature for 5 to 10 minutes to fully disperse the emulsifier and complete the interface activation. Deionized water is added while stirring, and high-speed shear emulsification is performed at 8000 to 12000 r / min for 8 to 15 minutes to obtain water-soluble tree moss micro-boss base. After cooling to room temperature and standing for 24 hours, there is no layering or floating oil. (3) Preparation of water-soluble compound fragrance base: Add water-soluble tobacco extract and water-soluble tobacco flavoring to the mixing tank, add deionized water and mix and stir for 5-10 min to form an aqueous fragrance liquid; under low speed stirring conditions, dropwise add the aqueous fragrance liquid to the water-soluble tree moss micro-lacquer base, continue stirring for 10-15 min to obtain the water-soluble compound fragrance base, filter it through a filter screen and set it aside; (4) At room temperature fine atomization spraying load: Place the filamentous reconstituted tobacco leaves in a dynamic tumbling spraying device, and use an ultrasonic fine atomization nozzle to spray the filamentous reconstituted tobacco leaves with water-soluble compound flavor base at room temperature and pressure, with droplet particle size controlled at 20-50μm; after spraying, continue to tumble and stir for 20-30min. (5) Closed balancing treatment: After spraying, the filamentous reconstituted tobacco leaves are transferred to a closed balancing chamber and left to stand for balancing for 2-4 hours under normal temperature and light-proof conditions to obtain tree moss-style reconstituted tobacco leaves.

2. The preparation method according to claim 1, characterized in that, The non-alcoholic cosolvent is propylene glycol or glycerol; the emulsifier is Tween-80 and / or sucrose fatty acid ester.

3. The preparation method according to claim 1, characterized in that, In step (2), the temperature of the constant temperature mixing tank is 50℃, the high-speed shear emulsification speed is 10000r / min, and the shear emulsification time is 10min.

4. The preparation method according to claim 1, characterized in that, In step (4), the amount of water-soluble compound flavor base sprayed is 1.0% of the mass of the filamentous reconstituted tobacco leaves; the tumbling and stirring time after spraying is 30 minutes.

5. The preparation method according to claim 1, characterized in that, In step (5), the closed equilibrium settling time is 3 hours.

6. The preparation method according to claim 1, characterized in that, The non-alcoholic cosolvent and the compound emulsifier are both tobacco grade or food grade.

7. A tree-moss-style reconstituted tobacco leaf prepared by any one of the preparation methods described in claims 1-6.

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