Tobacco raw material treatment method
By performing water vapor recovery, drying, balancing, yeast fermentation and inactivation treatment on tobacco raw materials, the problems of heavy sour taste, heavy miscellaneous air and high irritation of cigarette smoke when heating and not burning are solved, which significantly improves the aroma and aroma and temperament, and improves the sensory quality.
Patent Information
- Application Number
- CN202311429097.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-30
- Publication Date
- 2025-05-02
AI Technical Summary
The flue gas produced by existing heating-free cigarettes during heating has a strong sour smell, which is strong, has heavy miscellaneous air, and is highly irritating, affecting sensory quality.
A tobacco raw material treatment method, including water vapor recovery, drying, equilibrium, yeast fermentation and inactivation treatment, can remove miscellaneous gases and volatile acids in tobacco raw materials, promote the decomposition of aroma precursor substances and higher fatty acids, and reduce acid feeling and irritation.
It significantly improves the amount and aroma of the heating and non-burning cigarettes during the smoking process, reduces the miscellaneous air, irritation and acidity during the suction process, and improves the sensory quality.
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Figure CN119908498A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of tobacco technology, and in particular, to a method for processing tobacco raw materials. Background Art
[0002] Heat-not-burn cigarettes are a smoking method that heats tobacco substances through electronic devices instead of burning them. When smoking with electronic heating devices, consumers can not only feel the aroma of tobacco, but also heat the tobacco core at a lower temperature, which can significantly reduce the release of tar and undesirable substances in mainstream smoke. This smoking method is becoming more and more popular at home and abroad, and heat-not-burn cigarettes have become the mainstream direction of development in the tobacco industry.
[0003] However, current heat-not-burn cigarettes produce a strong sour taste when heated, with a strong kick, heavy odor, and strong irritation. Therefore, the current method of processing tobacco raw materials still needs to be improved. Summary of the invention
[0004] The present application aims to alleviate or solve at least one of the above-mentioned problems to at least some extent.
[0005] In one aspect of the present application, the present application proposes a method for processing tobacco raw materials. In some embodiments of the present application, the method for processing tobacco raw materials includes: (1) steam rehumidification of tobacco raw materials; (2) drying the tobacco raw materials after steam rehumidification treatment; (3) placing the tobacco raw materials after drying treatment in a balanced environment for balanced treatment; (4) adding yeast liquid to the tobacco raw materials treated in the balanced environment in step (3) for fermentation treatment; (5) inactivating the fermented tobacco raw materials; (6) placing the inactivated tobacco raw materials in a balanced environment for balanced treatment. Using yeast liquid to treat tobacco raw materials can promote the decomposition of tobacco aroma precursors, increase the aroma components of tobacco, increase the aroma amount during the smoking process of heat-not-burn cigarettes, and can also promote the decomposition of higher fatty acids in tobacco and reduce the sourness during the smoking process.
[0006] In some embodiments of the present application, in step (1), the moisture content of the tobacco raw material after the steam rehumidification treatment is 16%-20%. After the rehumidification treatment, subsequent drying treatment can effectively remove impurities, free nicotine and volatile acids in the tobacco raw material.
[0007] In some embodiments of the present application, in step (2), the moisture content of the tobacco raw material after drying is 10%-12%; and / or the drying temperature is 50° C.-90° C. Thus, part of the moisture and impurities in the tobacco raw material can be effectively removed, which is beneficial to improving the sensory quality of the heat-not-burn cigarette during smoking.
[0008] In some embodiments of the present application, in step (3), the temperature of the equilibration treatment is 22°C-25°C, and / or the relative humidity of the equilibration treatment is 60%-65%, and / or the time of the equilibration treatment is 24h-48h.
[0009] In some embodiments of the present application, in step (4), the tobacco raw material is placed in an environment with a temperature of 30°C-50°C and a relative humidity of 50%-90% for fermentation for 24h-120h. In the above environment, the activity of yeast in the yeast solution is high, which is conducive to promoting the decomposition of tobacco aroma precursors and the decomposition of higher fatty acids in tobacco.
[0010] In some embodiments of the present application, in step (4), the yeast in the yeast solution includes one or more of flat yeast, aroma yeast and brewer's yeast. The above types of yeast can at least promote the decomposition of aroma precursors and / or higher fatty acids to a certain extent.
[0011] In some embodiments of the present application, in step (4), the concentration of the yeast solution is 0.5%-5%. The concentration of the yeast solution is within the above range, which facilitates the adjustment and control of the quality of the yeast solution.
[0012] In some embodiments of the present application, the mass of the yeast in the yeast solution added in step (4) is 0.1%-1% of the mass of the tobacco raw material after treatment in the equilibrium environment. Therefore, when the mass of the yeast is within the above range, the aroma precursors and / or higher fatty acids can be effectively decomposed, thereby facilitating the improvement of the sensory quality of the heat-not-burn cigarette during smoking.
[0013] In some embodiments of the present application, in step (5), the temperature of the inactivation treatment is 110° C.-130° C., and / or the time of the inactivation treatment is 20 min-60 min. Inactivation treatment under the above conditions can inactivate the yeast, thereby maintaining the quality of the tobacco stable.
[0014] In some embodiments of the present application, in step (6), the temperature of the equilibration treatment is 22°C-25°C, and / or the relative humidity of the equilibration treatment is 60%-65%, and / or the time of the equilibration treatment is 24h-48h.
[0015] In some embodiments of the present application, the tobacco raw material includes one or both of flue-cured tobacco and air-cured tobacco. The yeast liquid can be used to treat the flue-cured tobacco and / or air-cured tobacco to decompose aroma precursors and / or higher fatty acids in the flue-cured tobacco and / or air-cured tobacco, thereby improving the sensory quality of the heat-not-burn cigarette during smoking.
[0016] In some embodiments of the present application, the tobacco raw material includes one or both of tobacco flakes and tobacco shreds. The yeast liquid can be used to process tobacco flakes and / or tobacco shreds, thereby improving the quality of the tobacco raw material. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0018] Figure 1 A flow chart of a method for processing tobacco raw materials according to one embodiment of the present application is shown. DETAILED DESCRIPTION
[0019] The embodiments of the present application are described in detail below. The embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.
[0020] Since heat-not-burn cigarettes have the characteristics of "heating tobacco or tobacco extracts instead of burning tobacco", the sensory quality of heat-not-burn cigarettes when smoking is quite different from that of traditional cigarettes. The smoke of heat-not-burn cigarettes made of unprocessed tobacco raw materials is strong, irritating, spicy, and strong sour, and has a heavy smell. Literature reports that there are more than 100 volatile and semi-volatile sour components in tobacco, mainly C1-C8 volatile acids, higher fatty acids, etc., which have a great influence on the sensory quality of smoke. When heated, the smoke has a strong sour or sweet and sour taste. In the related art, the tobacco raw materials are firstly extracted by ultrasonic leaching with alkali solution, then washed and filtered with pure water, and finally sealed and flavored for storage. Alternatively, the tobacco raw materials are first heated and absorbed by activated carbon, then sealed and flavored for storage. Alternatively, the tobacco raw materials are first heated in a closed manner (100°C-300°C), then sealed and flavored for storage, and finally sealed and flavored for storage. Alternatively, the tobacco raw materials are first fumigated with sealed ammonia, then sealed and flavored for storage. The above four schemes are all pre-treated for tobacco raw materials for heat-not-burn cigarettes, which mainly solve the problems of heavy sourness, heavy impurities, high irritation, and poor comfort of smoke, and improve the sensory smoking quality. However, the processes of the above four schemes are difficult to implement, and the cost is relatively high. Therefore, a method for processing tobacco raw materials with a relatively simple process and easy implementation with existing equipment is proposed to improve the smoking quality of tobacco raw materials for heat-not-burn cigarettes, which is of great significance to the actual production of heat-not-burn cigarette products.
[0021] In one aspect of the present application, the present application provides a method for processing tobacco raw materials. In some embodiments of the present application, reference is made to Figure 1 The method for processing tobacco raw materials may include the following steps:
[0022] (1) Steam conditioning of tobacco raw materials.
[0023] Steam conditioning of tobacco raw materials can remove impurities and evaporate some free nicotine, thereby reducing irritation during the smoking process; it can also evaporate some volatile acids, thereby reducing the sour feeling during the smoking process.
[0024] In some embodiments of the present application, the tobacco raw material is subjected to steam conditioning so that the moisture content of the tobacco raw material is 16%-20%. For example, after steam conditioning, the moisture content in the tobacco raw material can be 16%, 17%, 18%, 19%, 20%, etc., thereby further removing impurities, free nicotine and volatile acids in the tobacco raw material through subsequent drying treatment.
[0025] In some embodiments of the present application, the tobacco raw material may include one or both of flue-cured tobacco and air-dried tobacco. For example, the tobacco raw material may be flue-cured tobacco or air-dried tobacco, or a mixture of flue-cured tobacco and air-dried tobacco.
[0026] In some embodiments of the present application, when the tobacco raw material includes sun-cured tobacco, the sun-cured tobacco in the tobacco raw material may include at least one of burley tobacco, oriental tobacco and cigar tobacco, for example, the sun-cured tobacco in the tobacco raw material may be burley tobacco, oriental tobacco or cigar tobacco, or the sun-cured tobacco in the tobacco raw material may be a mixture of two or three of burley tobacco, oriental tobacco and cigar tobacco.
[0027] In some embodiments of the present application, the tobacco raw material includes one or both of tobacco flakes and tobacco shreds. In some specific embodiments of the present application, the tobacco raw material may be tobacco flakes, and herein, tobacco flakes refer to tobacco raw materials that have been destemmed and redried. In other specific embodiments of the present application, the tobacco raw material may be tobacco shreds. In other specific embodiments of the present application, the tobacco raw material may be a mixture of tobacco flakes and tobacco shreds.
[0028] (2) Drying the tobacco raw material after the steam rehumidification treatment.
[0029] In this step, the tobacco raw material after the steam rehumidification treatment is dried. In some embodiments of the present application, the tobacco raw material is dried until the moisture content of the tobacco raw material is 10%-12%, for example, the moisture content can be 10%, 10.5%, 11%, 11.5%, 12%, etc. During the drying process, some impurities, free nicotine and volatile acids can be removed.
[0030] In some embodiments of the present application, in step (2), the temperature of the drying treatment can be 50°C-90°C, for example, the temperature of the drying treatment can be 50°C, 55°C, 60°C, 65°C, 70°C, 90°C, etc. Drying the tobacco raw material at the above temperature can remove part of the moisture, and at the same time, can remove part of the impurities, free nicotine and volatile acid.
[0031] In some embodiments of the present application, in step (2), the temperature of the drying treatment can be 70°C-90°C, for example, the temperature of the drying treatment can be 70°C, 75°C, 80°C, 85°C, 90°C, etc. Drying the tobacco raw material at the relatively high temperature can make the moisture content in the tobacco raw material meet the use requirements in a shorter time, and can also remove some impurities, free nicotine and volatile acids in the tobacco raw material.
[0032] (3) Performing balancing treatment on the tobacco raw materials after drying.
[0033] In some embodiments of the present application, the tobacco raw material after drying can be placed in a balanced environment for 24h-48h (for example, 24h, 28h, 32h, 36h, 40h, 48h, etc.), and the temperature in the balanced environment can be 22°C-25°C, and the relative humidity can be 60%-65%. For example, the temperature in the balanced environment can be 22°C, 23°C, 24°C, 25°C, etc., and the relative humidity can be 60%, 61%, 62%, 63%, 64%, 65%, etc. Through the balanced treatment, the moisture in the tobacco raw material can be uniform, so that the quality of the tobacco raw material is more stable.
[0034] (4) Adding yeast liquid to the tobacco raw material after the equilibration treatment to carry out fermentation treatment.
[0035] Yeast liquid is added to the tobacco raw material after the equilibrium treatment in the equilibrium environment in step (3). In some embodiments of the present application, the yeast liquid can be evenly sprayed into the tobacco raw material.
[0036] In some embodiments of the present application, the yeast in the yeast solution may include one or more food yeasts such as flat yeast, aroma yeast and brewing yeast. In some specific embodiments of the present application, the yeast in the yeast solution may be flat yeast, aroma yeast or brewing yeast. In other specific embodiments of the present application, the yeast in the yeast solution may be a mixture of two or three of flat yeast, aroma yeast and brewing yeast. The above-mentioned types of yeast can promote the decomposition of aroma precursors, alkaloids and / or higher fatty acids in tobacco raw materials during subsequent fermentation, thereby reducing the sourness, impurities and irritation during the suction process, and increasing the aroma content.
[0037] In some embodiments of the present application, the concentration of the yeast solution can be 0.5%-5%. For example, the concentration of the yeast solution can be 0.5%, 0.7%, 1%, 1.5%, 2%, 3%, 4%, 5%, etc. The concentration of the yeast solution within the above range is more conducive to regulating and controlling the added quality of the yeast solution. In some embodiments of the present application, yeast powder can be dispersed in water to form a yeast solution. Herein, the concentration of the yeast solution refers to the mass content of yeast in the yeast solution.
[0038] In some embodiments of the present application, the mass of the yeast in the yeast solution added in step (4) can be 0.1%-1% of the mass of the tobacco raw material after equilibrium treatment in a balanced environment. For example, the mass of the yeast can be 0.1%, 0.2%, 0.5%, 0.7%, 0.9%, 1%, etc. of the mass of the tobacco raw material treated in a balanced environment. Thus, the amount of yeast added is within a suitable range, and the yeast can promote the degradation of aroma precursors, alkaloids and / or higher fatty acids in the tobacco raw material through biological fermentation, so that a certain amount of aroma precursors, alkaloids and / or higher fatty acids are degraded, thereby improving the sensory quality during the smoking process.
[0039] In some embodiments of the present application, after adding yeast liquid to the tobacco raw material, the tobacco raw material can be placed in an environment with a temperature of 30°C-50°C and a relative humidity of 50%-90% for fermentation for 24h-120h. In some embodiments of the present application, the tobacco raw material can be placed in an environment with a temperature of 30°C, 40°C, 42°C, 45°C, 47°C or 50°C and a relative humidity of 50%, 60%, 70%, 80% or 90% for fermentation for 24h, 32h, 36h, 40h, 96h, 108h or 120h. Fermenting in the above environment for 24h-120h can make full use of the biological fermentation to degrade some aroma precursors, alkaloids and / or higher fatty acids in the tobacco raw material, thereby further improving the smoking quality of the tobacco raw material. In the specific implementation process, the most suitable fermentation temperature can be set according to the specific type of yeast.
[0040] In some embodiments of the present application, in step (4), the tobacco raw material can be placed in an environment with a temperature of 30°C-40°C and a relative humidity of 70%-80% for fermentation for 48h-72h. For example, the tobacco raw material can be placed in an environment with a temperature of 30°C, 33°C, 35°C, 38°C or 40°C and a relative humidity of 70%, 72%, 75%, 77% or 80% for fermentation for 48h, 56h, 60h, 64h, 72h, etc. Fermenting in the above environment for 48h-72h can more fully utilize the biological fermentation effect to degrade the aroma precursors, alkaloids and / or higher fatty acids in the tobacco raw material, increase the aroma components, and reduce the impurities, irritation and sourness during the smoking process.
[0041] (5) Perform inactivation treatment.
[0042] The fermented tobacco raw material is inactivated. In some embodiments of the present application, the temperature of the inactivation treatment may be 110°C-130°C, and the time of the inactivation treatment may be 20min-60min. For example, the temperature of the inactivation treatment may be 110°C, 115°C, 120°C, 125°C, 130°C, etc., and the time of the inactivation treatment may be 20min, 30min, 40min, 50min, 60min, etc. In this way, the yeast added to the tobacco raw material can be inactivated, thereby maintaining the quality of the tobacco stable.
[0043] In some embodiments of the present application, in step (5), the temperature of the inactivation treatment may be 120°C-130°C, and the time of the inactivation treatment may be 30min-40min. For example, the temperature of the inactivation treatment may be 120°C, 122°C, 124°C, 126°C, 127°C, 130°C, etc., and the time of the inactivation treatment may be 30min, 32min, 34min, 36min, 39min, 40min, etc. Thus, the yeast may be inactivated in a shorter time, thereby maintaining the tobacco quality stable.
[0044] (6) Performing a balancing treatment on the tobacco raw materials after the inactivation treatment.
[0045] In this step, the tobacco raw material after the inactivation treatment can be placed in a balanced environment for 24h-48h (for example, it can be placed in a balanced environment for 24h, 28h, 32h, 36h, 48h, etc.), and the temperature in the balanced environment can be 22°C-25°C, and the relative humidity can be 60%-65%. In some embodiments of the present application, in the balanced environment, the temperature can be 22°C, 23°C, 24°C, 25°C, etc., and the relative humidity can be 60%, 61%, 62%, 63%, 64%, 65%, etc. After the balanced treatment, the tobacco raw material has a suitable moisture content, and the moisture in the tobacco raw material is evenly distributed, and the quality of the tobacco raw material is more stable.
[0046] In general, in this application, through steam rehumidification and drying treatment, some volatile gases and free nicotine in the tobacco raw materials can be removed, reducing the impurities, strength and irritation in the process of smoking tobacco raw materials; adding yeast liquid to the tobacco raw materials for high temperature and high humidity fermentation, the degradation of aroma precursors, alkaloids and higher fatty acids in the tobacco raw materials is promoted through biological fermentation, and the raw material smoking quality is improved. After the tobacco raw materials are fermented by yeast liquid at high temperature and high humidity, under the heating state, the smoke is mellow and the strength is moderate, the impurities and irritation are significantly reduced, the sourness is significantly weakened, the sensory smoking quality is significantly improved, and the applicability of the treated tobacco raw materials in heated cigarette products is significantly enhanced. The processing method proposed in this application is simple to operate, the required process section is relatively simple, the process equipment is mature, and it is suitable for large-scale production and application, which has practical significance for the production and development of heat-not-burn cigarette products.
[0047] The present application will be described below by specific examples, and it will be appreciated by those skilled in the art that the following specific examples are only for illustrative purposes, and do not limit the scope of the present application in any way. In addition, in the following examples, unless otherwise specified, the materials and equipment used are all commercially available. If in the following examples, specific processing conditions and processing methods are not clearly described, then conditions and methods known in the art can be used to process.
[0048] Example 1
[0049] 1) subjecting the tobacco raw material to water vapor conditioning, wherein the moisture content of the tobacco raw material after conditioning is 18%-20%;
[0050] 2) drying the tobacco raw material after the steam rehumidification treatment at a temperature of 70° C., and the moisture content of the tobacco raw material after the drying treatment is 10%-12%;
[0051] 3) placing the dried tobacco raw material in a balanced environment for 24 hours (balance conditions: temperature of 22° C., relative humidity of 60%);
[0052] 4) evenly spraying flat yeast liquid (flat yeast powder dispersed in water) onto the tobacco raw material treated in the equilibrium environment in step 3), wherein the concentration of the flat yeast liquid is 1%, and the mass of the flat yeast liquid added is 10% of the mass of the tobacco raw material after the equilibrium treatment, that is, the mass of the flat yeast in the flat yeast liquid is 0.1% of the mass of the tobacco raw material after the equilibrium treatment; placing the tobacco raw material added with the flat yeast liquid in a constant temperature and humidity environment (in a temperature and humidity control box) at a temperature of 50° C. and a relative humidity of 65% for fermentation for 24 hours;
[0053] 5) Adjust the temperature of the temperature and humidity control box to 120°C, keep the relative humidity unchanged, and inactivate for 30 minutes;
[0054] 6) Placing the tobacco raw material inactivated in step 5) in a balanced environment for 48 hours (equilibrium conditions: temperature of 22° C., relative humidity of 60%) to obtain a pretreated tobacco raw material.
[0055] Example 2
[0056] The difference from Example 1 is that in Example 2, the mass of the flat yeast liquid is 100% of the mass of the tobacco raw material after the balancing treatment, that is, the mass ratio of the flat yeast liquid to the mass of the tobacco raw material after the balancing treatment in step 3) is 1:1, and the mass of the flat yeast in the flat yeast liquid is 1% of the mass of the tobacco raw material after the balancing treatment. The other parameters and steps are the same as in Example 1.
[0057] Example 3
[0058] The difference from Example 2 is that the fermentation time in Example 3 is 72 hours, and the other parameters and steps are the same as those in Example 2.
[0059] Application effect evaluation:
[0060] After adding smoke generating agents (such as propylene glycol, glycerol, etc.) to the tobacco raw materials obtained by the methods of Examples 1-3 and the untreated burley tobacco raw materials (control samples) in the same proportion, the sensory quality was evaluated using a heat-not-burn device. The evaluation results are shown in Table 1 below:
[0061] Table 1 Sensory quality evaluation results of each embodiment and control sample
[0062]
[0063] In Table 1, the sensory evaluation is compared:
[0064] Higher smoke concentration > Slightly higher smoke concentration > Low smoke concentration;
[0065] Moderate strength > moderate strength > slightly stronger strength > stronger strength > strong strength;
[0066] Good clumping ability > fair clumping ability > poor clumping ability;
[0067] Smoke is relatively fine > Smoke is slightly fine > Smoke is rough and sour;
[0068] Better aroma quality > Slightly better aroma quality > Poor aroma quality;
[0069] The aroma is sufficient > the aroma is relatively sufficient > the aroma is acceptable > the aroma is bland;
[0070] Light impurities > Light impurities > Slightly light impurities > Heavy impurities;
[0071] Little irritation > Slight irritation > Slight irritation > High irritation;
[0072] Clean aftertaste in mouth > Fair aftertaste in mouth > Slightly worse aftertaste in mouth > Strong acid taste in mouth, worse aftertaste;
[0073] Better comfort > Fair comfort > Slightly worse comfort > Poor comfort.
[0074] As shown in Table 1, compared with the control sample, the sensory quality of the tobacco raw materials after treatment in Examples 1-3 during the smoking process is significantly improved. Compared with Example 2, the fermentation time in Example 3 is longer, and more aroma precursors, alkaloids, higher fatty acids, etc. in the tobacco raw materials can be decomposed by fermentation, thereby further reducing the impurities and irritation during the smoking process. By comparison, it can be seen that the method proposed in this application can be used to treat tobacco raw materials, which can at least reduce the impurities, irritation and acidity during the smoking process to a certain extent, increase the aroma amount, and improve the aroma quality.
[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "other embodiments", "some specific embodiments", "other specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0076] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A method for processing tobacco raw materials, characterized in that: include: (1) steam conditioning the tobacco raw materials; (2) drying the tobacco raw material after the steam rehumidification treatment; (3) placing the tobacco raw material after the drying process in a balanced environment for balanced treatment; (4) adding yeast liquid to the tobacco raw material subjected to the balancing treatment in step (3) to carry out fermentation treatment; (5) inactivating the fermented tobacco raw material; (6) Placing the inactivated tobacco raw materials in a balanced environment for balanced treatment.
2. The method according to claim 1, characterized in that In step (1), the moisture content of the tobacco raw material after the steam rehumidification treatment is 16%-20%.
3. The method according to claim 1, characterized in that In step (2), the moisture content of the tobacco raw material after drying is 10%-12%; and / or the temperature of the drying is 50°C-90°C.
4. The method according to claim 1, characterized in that: In step (3), the temperature of the equilibration treatment is 22° C.-25° C., and / or the relative humidity of the equilibration treatment is 60%-65%, and / or the time of the equilibration treatment is 24h-48h.
5. The method according to claim 1, characterized in that In step (4), the tobacco raw material is placed in an environment with a temperature of 30° C. to 50° C. and a relative humidity of 50% to 90% for fermentation for 24 hours to 120 hours.
6. The method according to claim 1, characterized in that In step (4), the yeast in the yeast solution includes one or more of flat yeast, aroma yeast and brewing yeast; and / or, The concentration of yeast solution is 0.5%-5%.
7. The method according to claim 1, characterized in that The mass of the yeast in the yeast solution added in step (4) is 0.1%-1% of the mass of the tobacco raw material after being treated in a balanced environment.
8. The method according to claim 1, characterized in that In step (5), the temperature of the inactivation treatment is 110° C.-130° C., and / or the time of the inactivation treatment is 20 min-60 min.
9. The method according to claim 1, characterized in that: In step (6), the temperature of the equilibration treatment is 22° C.-25° C., and / or the relative humidity of the equilibration treatment is 60%-65%, and / or the time of the equilibration treatment is 24h-48h.
10. The method according to any one of claims 1 to 9, characterized in that The tobacco raw materials include one or both of flue-cured tobacco and sun-cured tobacco; And / or, the tobacco raw material includes one or both of tobacco strips and tobacco shreds.