Method for improving suitability of long-aging sun-cured tobacco leaves and application thereof

Abstract

The application provides a method for improving the suitability of long-aging air-cured tobacco leaves, which comprises the following steps: (1) vacuuming, primary leaf conditioning, secondary leaf conditioning and re-drying of the long-aging air-cured tobacco leaves to obtain treated tobacco leaves; (2) second vacuuming, three times of leaf conditioning, and then mixing with biological enzymes for alcoholization, inactivation and obtaining inactivated tobacco leaves; (3) loose re-drying, adding materials and baking of the inactivated tobacco leaves to obtain finished tobacco leaves. The method provided by the application reduces the peculiar smell of long-aging air-cured tobacco leaves, improves the smoke comfort and aftertaste in the mouth, and the treated tobacco leaves can be directly used as a component in a tobacco leaf formula.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tobacco processing, and particularly relates to a method for improving the applicability of long-aged air-cured tobacco leaves and application thereof. BACKGROUND

[0002] Sun-cured tobacco, burley tobacco and oriental tobacco are indispensable tobacco raw materials in mixed cigarettes, but as the demand for mixed cigarettes decreases, the market for mixed cigarettes has decreased significantly, resulting in a certain amount of long-aged sun-cured tobacco, burley tobacco and oriental tobacco and other mixed tobacco raw materials accumulated in cigarette enterprises. The long-aged air-cured tobacco has high density, excessive strength, harsh smoke, heavy offensive odor, heavy breath odor and poor aftertaste, and thus cannot be directly used in the tobacco leaf formula of flue-cured tobacco type cigarettes, resulting in long-term accumulation of long-aged air-cured tobacco raw materials in the warehouse, high warehouse maintenance pressure, occupied funds and failure to realize the value of the air-cured tobacco.

[0003] CN106579534A provides a processing method for improving the applicability of burley tobacco in flue-cured tobacco type cigarettes, which includes the following steps: (1) placing burley tobacco leaves into a vacuum moisture regenerator and moisturizing for 20-30 minutes; (2) immersing the burley tobacco in a solution containing 5-8% concentration for 10-15 minutes, and the solution contains citric acid, malic acid and lactic acid; (3) sending the immersed burley tobacco into a drying machine for two-stage drying, and then cutting the tobacco leaves; (4) adding ingredients, and adding ingredients to the burley tobacco according to a proportion of 3%, and the ingredients include indole, dihydrodamascenone, fennel oil, fig extract and cocoa; and (5) storing the tobacco leaves for 2 hours after adding the ingredients, so that the ingredients and the tobacco leaves are fully combined. In the processing method, a large number of chemical components are added during the addition of ingredients, the cost is high, and the organic acid still has deficiencies in reducing the offensive odor and irritation of burley tobacco.

[0004] CN111887461A provides a burley tobacco processing method capable of effectively improving the quality of tobacco leaves, which includes the following steps: performing constant-speed drying on the tobacco leaves; after the burley tobacco leaves are dried at a constant speed for a certain period of time, reducing the temperature of the hot process air, maintaining the predetermined humidity of the hot process air, and performing first-stage deceleration drying on the tobacco leaves; after the deceleration drying for a period of time, reducing the humidity of the hot process air, and performing second-stage deceleration drying on the tobacco leaves. However, the temperature is high during the processing of the method, which can easily cause the tobacco leaves to have dry ends.

[0005] CN112841697A provides a processing method for improving the applicability of sun-cured yellow tobacco formula, comprising the following steps: (1) sun-cured yellow tobacco is sequentially subjected to loose rehydration, primary mixing, feeding, primary leaf storage, baking and boxing treatment on a burley tobacco production line to obtain primary modified tobacco leaves; the feeding liquid contains the following components by weight: honey 25-30 parts, lactic acid 3-5 parts, methylcyclopentenolone 4-6 parts, citric acid 5-8 parts, anise camphor acetate 10-15 parts, glucose 25-30 parts, and water 10-15 parts; (2) the primary modified tobacco leaves are sent to a leaf threshing and redrying production line for vacuum rehydration, secondary mixing, leaf conditioning, secondary leaf storage, redrying and packaging treatment to obtain secondary modified tobacco leaves. The invention improves the delicacy of sun-cured yellow tobacco smoke, improves aroma quality, reduces smoke irritation, and improves taste, etc., so that the internal quality of sun-cured yellow tobacco is further improved, the internal chemical composition of sun-cured yellow tobacco is more coordinated, and the formula applicability of sun-cured yellow tobacco can be effectively improved.

[0006] CN111671125A discloses a mixing processing method of sun-cured yellow tobacco, comprising the following steps: pretreating the sun-cured yellow tobacco; mixing the pretreated sun-cured yellow tobacco with other raw tobacco materials to obtain mixed tobacco materials; and reprocessing the mixed tobacco materials to form a final product. The mixing processing method of the invention, by means of a leaf threshing and redrying production line, through the combination of different processing procedures, achieves the purposes of reducing the smoke density and peculiar odor of sun-cured yellow tobacco, improving the smoke characteristics and taste characteristics, thereby improving the use value of sun-cured yellow tobacco raw materials, and enabling the treated sun-cured yellow tobacco to be applied in cigarette formulas without reducing the quality of cigarettes.

[0007] However, the above methods cannot completely solve the problems faced by sun-cured yellow tobacco, burley tobacco and tobacco leaf raw materials such as aromatic tobacco due to long-term storage. Therefore, in order to improve the application value of long-aged sun-cured tobacco, there is an urgent need for a better processing method that can reduce the peculiar odor and irritation of long-aged sun-cured tobacco without damaging the practical value of long-aged sun-cured tobacco. SUMMARY

[0008] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a method for improving the applicability of long-aged sun-cured tobacco leaves and its application. The method provided by the present invention reduces the peculiar odor of long-aged sun-cured tobacco leaves, improves the comfort of smoke and the aftertaste in the mouth, and can be directly used as a component in a tobacco leaf formula after treatment.

[0009] To achieve this invention, the following technical solutions are adopted:

[0010] On the one hand, the present invention provides a method for improving the applicability of long-aged sun-cured tobacco leaves, comprising the following steps:

[0011] (1) vacuum rehydration, primary leaf conditioning, secondary leaf conditioning and redrying of long-aged sun-cured tobacco leaves to obtain treated tobacco leaves;

[0012] (2) The treated tobacco leaves are subjected to a second vacuum conditioning, three times of leaf moistening, and then mixed with biological enzymes for alcoholization and inactivation to obtain inactivated tobacco leaves;

[0013] (3) The inactivated tobacco leaves are subjected to loose conditioning, addition of materials and baking to obtain finished tobacco leaves.

[0014] The above method reduces the offensive odor of the long-aged air-cured tobacco leaves, improves the smoke comfort and aftertaste, and enables the treated long-aged air-cured tobacco leaves to be directly used as a component in a tobacco leaf formula. The treated long-aged air-cured tobacco leaves have moderate strength, weak air-cured tobacco odor, less irritation, clean and comfortable aftertaste, high formula applicability, improved formula applicability of the long-aged air-cured tobacco leaves, reduced storage and maintenance costs, and improved use value.

[0015] Preferably, the long-aged air-cured tobacco leaves include any one or a combination of at least two of sun-cured tobacco, Oriental tobacco or burley tobacco.

[0016] Preferably, the vacuum conditioning in step (1) is performed for two cycles, the first cycle has a vacuum degree of 0.8-1.2 kPa and a pressure maintaining time of 80-120 s, the second cycle has a vacuum degree of 0.8-1.2 kPa and a pressure maintaining time of 10-20 s, the outlet temperature of the vacuum conditioning is 70-80°C, and the moisture content of the discharged material is 11-13%.

[0017] Preferably, the vacuum degree of the first cycle can be 0.8 kPa, 0.9 kPa, 1 kPa, 1.1 kPa or 1.2 kPa, the pressure maintaining time can be 80 s, 90 s, 100 s, 110 s or 120 s, the vacuum degree of the second cycle can be 0.8 kPa, 0.9 kPa, 1 kPa, 1.1 kPa or 1.2 kPa, the pressure maintaining time can be 10 s, 11 s, 12 s, 13 s, 14 s, 15 s, 16 s, 17 s, 18 s, 19 s or 20 s, the outlet temperature can be 70°C, 72°C, 74°C, 76°C, 78°C or 80°C, and the moisture content of the discharged material can be 11%, 11.5%, 12%, 12.5% or 13%, but is not limited to the above-mentioned values. Other values within the above-mentioned ranges are also applicable.

[0018] Preferably, the outlet temperature of the first leaf moistening in step (1) is 40-50°C, and the outlet moisture content is 18-20%; the outlet temperature of the second leaf moistening is 50-60°C, and the outlet moisture content is 20-22%.

[0019] In the first leaf moistening, the outlet temperature can be 40℃, 42℃, 44℃, 46℃, 48℃ or 50℃, etc., and the moisture content can be 18%, 18.5%, 19%, 19.5% or 20%, etc.; in the second leaf moistening, the outlet temperature can be 50℃, 52℃, 54℃, 56℃, 58℃ or 60℃, etc., and the outlet moisture content can be 20%, 20.5%, 21%, 21.5% or 22%, etc., but not limited to the above listed values, other values not listed within the above value range are also applicable.

[0020] Preferably, in the re-drying process of step (1), the temperature of the first drying zone is 45-55℃, the temperature of the second drying zone is 55-65℃, the temperature of the third drying zone is 75-85℃, the temperature of the fourth drying zone is 55-65℃, the temperature of the fifth drying zone is 45-55℃, the temperature of the sixth drying zone is 40-50℃, and the cooling treatment is to a temperature of 25-35℃ and a moisture content of 10-11%.

[0021] Preferably, in the re-drying process of step (1), the temperature of the first drying zone is 45-55℃, the temperature of the second drying zone is 55-65℃, the temperature of the third drying zone is 75-85℃, the temperature of the fourth drying zone is 55-65℃, the temperature of the fifth drying zone is 45-55℃, the temperature of the sixth drying zone is 40-50℃, and the cooling treatment is to a temperature of 25-35℃ and a moisture content of 10-11%.

[0022] Preferably, in the second vacuum re-drying process of step (2), one cycle is used, the outlet temperature is 70-80℃, and the moisture content of the discharged material is 12-13%; wherein the outlet temperature can be 70℃, 72℃, 74℃, 76℃, 78℃ or 80℃, etc., and the moisture content of the discharged material can be 12%, 12.2%, 12.4%, 12.6%, 12.8% or 13%, etc., but not limited to the above listed values, other values not listed within the above value range are also applicable.

[0023] Preferably, the three times of wetting in step (2) has an outlet temperature of 40-50℃ and an outlet moisture content of 18-20%. The outlet temperature can be 40℃, 42℃, 44℃, 46℃, 48℃ or 50℃, and the outlet moisture content can be 18%, 18.5%, 19%, 19.5% or 20%, but is not limited to the above values. Other values within the above ranges are also applicable.

[0024] Preferably, the biological enzyme in step (2) comprises any one or a combination of at least two of protease, ammonia nitrogen degrading enzyme, pectinase or catalase, preferably a combination of protease, ammonia nitrogen degrading enzyme, pectinase and catalase.

[0025] The above specific combination of biological enzymes can effectively reduce harmful smoke and improve smoke comfort and oral aftertaste by using a combination of protease, ammonia nitrogen degrading enzyme, pectinase and catalase.

[0026] Preferably, the biological enzyme in step (2) is added in the form of an enzyme solution, and the enzyme solution is added in an amount of 5-10% of the mass of the tobacco leaves and has a mass fraction of 8-12%.

[0027] Preferably, the alcoholization in step (2) has a temperature of 43-48℃, a humidity of 75-85% and a time of 30-36h. The temperature can be 43℃, 44℃, 45℃, 46℃, 47℃ or 48℃, the humidity can be 75%, 77%, 79%, 81%, 83% or 85%, and the time can be 30h, 31h, 32h, 33h, 34h, 35h or 36h, but is not limited to the above values. Other values within the above ranges are also applicable.

[0028] Preferably, the inactivation in step (2) has a temperature of 45-50℃ in the first inactivation zone, 50-55℃ in the second inactivation zone, 50-55℃ in the third inactivation zone, 50-55℃ in the fourth inactivation zone, 45-50℃ in the fifth inactivation zone and 40-45℃ in the sixth inactivation zone.

[0029] The temperature of the inactivation zone can be 45°C, 47°C, 49°C, 51°C, 53°C, or 55°C, etc., the temperature of the inactivation zone II can be 50°C, 51°C, 52°C, 53°C, 54°C, or 55°C, etc., the temperature of the inactivation zone III can be 50°C, 51°C, 52°C, 53°C, 54°C, or 55°C, etc., the temperature of the inactivation zone IV can be 50°C, 51°C, 52°C, 53°C, 54°C, or 55°C, etc., the temperature of the inactivation zone V can be 45°C, 46°C, 47°C, 48°C, 49°C, or 50°C, etc., and the temperature of the inactivation zone VI can be 40°C, 41°C, 42°C, 43°C, 44°C, or 45°C, etc., but not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.

[0030] Preferably, in the loose re-damping of step (3), the hot air return temperature is 57°C-63°C, and the discharge moisture is 19%-21%. The hot air return temperature can be 57°C, 58°C, 59°C, 60°C, 61°C, 62°C, or 63°C, etc., and the discharge moisture can be 19%, 19.5%, 20%, 20.5%, or 21%, etc., but not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.

[0031] Preferably, in the feeding liquid of step (3), the mass fraction of glucose is 25%-35%, the mass fraction of honey is 15%-25%, the mass fraction of lactic acid is 3%-7%, the mass fraction of citric acid is 3%-7%, the mass fraction of methyl cyclopentenolone is 1.5%-2.5%, the mass fraction of ethyl maltol is 1%-5%, the mass fraction of anisic acid ester is 0.5%-1.5%, and the rest is water.

[0032] The mass fraction of glucose can be 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, or 35%, etc., the mass fraction of honey can be 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, or 25%, etc., the mass fraction of lactic acid can be 3%, 4%, 5%, 6%, or 7%, etc., the mass fraction of citric acid can be 3%, 4%, 5%, 6%, or 7%, etc., the mass fraction of methyl cyclopentenolone can be 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, or 2.5%, etc., the mass fraction of ethyl maltol can be 1%, 2%, 3%, 4%, or 5%, etc., and the mass fraction of anisic acid ester can be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, or 1.5%, etc., but not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.

[0033] The three are compounded to reduce the bad smoke, improve the smoke comfort and the aftertaste in the mouth.

[0034] Preferably, the mass of the feeding liquid in step (3) is 3-7% of the mass of the tobacco leaf after inactivation, for example 3%, 4%, 5%, 6% or 7%, but is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned value range are also applicable.

[0035] Preferably, in the baking in step (3), the hot air temperature of the first baking zone is 100-110 DEG C, the hot air temperature of the second baking zone is 125-135 DEG C, the hot air temperature of the third baking zone is 100-110 DEG C, and the moisture content at the baking outlet is 12-13%.

[0036] Preferably, in the baking in step (3), the hot air temperature of the first baking zone is 100-110 DEG C, the hot air temperature of the second baking zone is 125-135 DEG C, the hot air temperature of the third baking zone is 100-110 DEG C, and the moisture content at the baking outlet is 12-13%.

[0037] On the other hand, the application also provides the use of the method as described above in the processing of long-aged air-cured tobacco leaves.

[0038] Compared with the prior art, the application has the following beneficial effects:

[0039] The application provides a method for improving the applicability of long-aged air-cured tobacco leaves. DETAILED DESCRIPTION

[0040] For further illustrating the technical means adopted by the present application and its effects, the technical solutions of the present application will be further explained in combination with the preferred embodiments of the present application below, but the present application is not limited in the scope of the embodiments.

[0041] In the following examples, the protease is purchased from Inner Mongolia Kunming Cigarette Co., Ltd., model MK / JS2-39093;

[0042] The ammonia nitrogen degrading enzyme is purchased from Inner Mongolia Kunming Cigarette Co., Ltd., model MK / JS2-39096;

[0043] The pectinase is purchased from Inner Mongolia Kunming Cigarette Co., Ltd., model MK / JS2-18894;

[0044] The catalase is purchased from Inner Mongolia Kunming Cigarette Co., Ltd., model MK / JS2-58914.

[0045] Example 1

[0046] The present embodiment provides a method for improving the suitability of long-aging air-cured tobacco leaves, and the specific steps are as follows:

[0047] (1) The long-aging air-cured tobacco leaves (wherein the mass ratio of sun-cured tobacco, Oriental tobacco and burley tobacco is 3:2:5) are subjected to vacuum re-damping (two cycles, the first cycle has a vacuum degree of 1 kPa and a pressure maintaining time of 100 s, the second cycle has a vacuum degree of 1 kPa and a pressure maintaining time of 15 s, the vacuum re-damping outlet temperature is 75℃, and the discharge moisture is 12%), primary leaf conditioning (the outlet temperature is 45℃ and the outlet moisture is 20%), secondary leaf conditioning (the outlet temperature is 55℃ and the outlet moisture is 20%) and re-damping treatment (the temperature of the first drying zone is 45℃-55℃, the temperature of the second drying zone is 55℃-65℃, the temperature of the third drying zone is 75℃-85℃, the temperature of the fourth drying zone is 55℃-65℃, the temperature of the fifth drying zone is 45℃-55℃, the temperature of the sixth drying zone is 40℃-50℃, the cooling treatment is to a temperature of 25℃ and a moisture of 10%);

[0048] (2) The aged air-cured tobacco treated in step (1) is subjected to a second vacuum conditioning (one cycle, vacuum degree 1.0 kPa, pressure maintaining time 15 s, outlet temperature 75℃, and outlet moisture 12%), three times of leaf moistening (outlet temperature 45℃, and outlet moisture 20%), biological enzyme preparation application (adding 6% of the mass of the tobacco of a biological enzyme aqueous solution, moisture 90%, and enzyme component mass ratio protease:ammonia nitrogen degrading enzyme:pectinase:hydrogen peroxidase = 4:3:2:1), and aging (aging room temperature 45℃, humidity 80%, and aging time 35 h) before being subjected to inactivation (temperature of inactivation zone 1 45-50℃, temperature of inactivation zone 2 50-55℃, temperature of inactivation zone 3 50-55℃, temperature of inactivation zone 4 50-55℃, temperature of inactivation zone 5 45-50℃, and temperature of inactivation zone 6 40-45℃);

[0049] (3) The aged air-cured tobacco treated in step (2) is subjected to loose conditioning (outlet temperature 60℃, and outlet moisture 20%) and feeding (feeding outlet temperature 55℃, outlet moisture 30%, and feeding liquid formula glucose 30%, honey 20%, lactic acid 5%, citric acid 5%, methyl cyclopentenolone 2%, ethyl maltol 3%, anisic acid ester 1%, and the rest water, and feeding ratio 5%) in a burley tobacco processing line, and is subjected to curing (curing outlet moisture 12%, hot air temperature of curing zone 1 100-110℃, hot air temperature of curing zone 2 125-135℃, hot air temperature of curing zone 3 100-110℃, zone 1 moisture removal opening degree 100%, zone 2 moisture removal opening degree 70%, and zone 3 moisture removal opening degree 50%) after being stored for 2 h, and finally forms finished tobacco leaves.

[0050] Example 2

[0051] The example provides a method for improving the applicability of aged air-cured tobacco leaves, and the specific steps are consistent with those of example 1 except that no ammonia nitrogen degrading enzyme is added in step (2), and part of the protease is distributed to the pectinase and hydrogen peroxidase according to the proportion.

[0052] Example 3

[0053] The example provides a method for improving the applicability of aged air-cured tobacco leaves, and the specific steps are consistent with those of example 1 except that no protease is added in step (2), and part of the protease is distributed to the ammonia nitrogen degrading enzyme, pectinase and hydrogen peroxidase according to the proportion.

[0054] Example 4

[0055] The example provides a method for improving the applicability of aged air-cured tobacco leaves, and the specific steps are consistent with those of example 1 except that no pectinase is added in step (2), and part of the pectinase is distributed to the protease, ammonia nitrogen degrading enzyme and hydrogen peroxidase according to the proportion.

[0056] Example 5

[0057] The embodiment provides a method for improving the suitability of long-aging air-cured tobacco leaves, wherein the specific steps are consistent with those in Example 1, except that in step (2), catalase is not added, and part of the protease, pectinase and ammonia nitrogen degrading enzyme is distributed in proportion.

[0058] Example 6

[0059] The embodiment provides a method for improving the suitability of long-aging air-cured tobacco leaves, wherein the specific steps are consistent with those in Example 1, except that in step (3), glucose is not added, and part of the citric acid and ethyl maltol is distributed in proportion.

[0060] Example 7

[0061] The embodiment provides a method for improving the suitability of long-aging air-cured tobacco leaves, wherein the specific steps are consistent with those in Example 1, except that in step (3), citric acid is not added, and part of the glucose and ethyl maltol is distributed in proportion.

[0062] Example 8

[0063] The embodiment provides a method for improving the suitability of long-aging air-cured tobacco leaves, wherein the specific steps are consistent with those in Example 1, except that in step (3), ethyl maltol is not added, and part of the citric acid and glucose is distributed in proportion.

[0064] Effect test:

[0065] The products obtained in Examples 1-8 and the original long-aging air-cured tobacco leaves (as original) are subjected to component determination, and the results are as follows:

[0066]

[0067]

[0068] From the above data, it can be found that the method provided by the application can effectively reduce the nicotine and total nitrogen content, and improve the sugar content, and the effect is better.

[0069] Then, seven special grade taste testers are organized, the indexes of the products obtained in Examples 1-8 and the cigarettes made from the original samples are subjected to sensory evaluation according to the evaluation contents and evaluation standards in the following table:

[0070]

[0071] The results are as follows:

[0072]

[0073] From the above data, it can be found that the cigarette made of the tobacco leaf obtained by the method provided by the application has obvious improvement in breath, aroma quality, aroma amount, softness and sweetness, and obvious decrease in smoke breath, strength and smoke concentration; it can be found from the comparative examples 1-8 that the four compounds of protease, ammonia nitrogen degrading enzyme, pectinase and catalase, and the three compounds of glucose, citric acid and ethyl maltol are compounded, and the synergistic effect can effectively reduce the bad smoke and improve the smoke comfort and oral aftertaste.

[0074] The applicant declares that the method for improving the applicability of long-aged air-dried tobacco leaf and the application thereof of the application are illustrated by the above examples, but the application is not limited to the above examples, that is, it does not mean that the application must rely on the above examples to be implemented. It should be understood by those skilled in the art that any improvement on the application, equivalent replacement of each raw material of the product of the application, addition of auxiliary ingredients, selection of specific modes, etc. all fall within the protection scope and disclosure scope of the application.

[0075] The preferred embodiments of the application are described in detail above, but the application is not limited to the specific details in the above embodiments, and within the technical concept scope of the application, various simple modifications can be made to the technical solutions of the application, and these simple modifications all belong to the protection scope of the application.

[0076] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the application will not further illustrate various possible combination manners.

Claims

1. A method for improving the suitability of long-aging sun-cured tobacco leaves, characterized by, The method comprises the following steps: (1) vacuum rehydrating, primary leaf conditioning, secondary leaf conditioning and re-drying of aged air-cured tobacco leaves to obtain treated tobacco leaves; (2) second vacuum rehydrating, third leaf conditioning, and then mixing with biological enzymes for alcoholization and inactivation to obtain inactivated tobacco leaves; (3) loose rehydrating, adding material and baking the inactivated tobacco leaves to obtain finished tobacco leaves; In step (2), the biological enzymes are a combination of protease, ammonia nitrogen degrading enzyme, pectinase and catalase; the biological enzymes are added in the form of enzyme solution, the addition amount of the enzyme solution is 5%-10% of the mass of the tobacco leaves, and the mass fraction of the enzyme solution is 8%-12%; In step (3), the material liquid for adding material comprises, in terms of mass fraction, 25%-35% of glucose, 15%-25% of honey, 3%-7% of lactic acid, 3%-7% of citric acid, 1.5%-2.5% of methyl cyclopentenolone, 1%-5% of ethyl maltol, 0.5%-1.5% of anise acetate and the balance of water; the mass of the material liquid for adding material is 3%-7% of the mass of the inactivated tobacco leaves.

2. The method of claim 1, wherein, The aged air-cured tobacco leaves comprise any one or a combination of at least two of sun-cured tobacco, aromatic tobacco or burley tobacco.

3. The method of claim 1, wherein, In step (1), the vacuum rehydrating adopts two cycles, the first cycle has a vacuum degree of 0.8-1.2 kPa and a pressure maintaining time of 80-120 s, the second cycle has a vacuum degree of 0.8-1.2 kPa and a pressure maintaining time of 10-20 s, the outlet temperature of the vacuum rehydrating is 70℃-80℃, and the outlet moisture is 11%-13%.

4. The method of claim 1, wherein, In step (1), the outlet temperature of the primary leaf conditioning is 40℃-50℃, and the outlet moisture is 18%-20%; the outlet temperature of the secondary leaf conditioning is 50℃-60℃, and the outlet moisture is 20%-22%.

5. The method of claim 1, wherein, In step (1), in the re-drying, the temperature of the first drying zone is 45℃-55℃, the temperature of the second drying zone is 55℃-65℃, the temperature of the third drying zone is 75℃-85℃, the temperature of the fourth drying zone is 55℃-65℃, the temperature of the fifth drying zone is 45℃-55℃, the temperature of the sixth drying zone is 40℃-50℃, the cooling treatment is performed until the temperature is 25℃-35℃ and the moisture is 10%-11%.

6. The method of claim 1, wherein, In step (2), the second vacuum rehydrating adopts one cycle, the outlet temperature is 70℃-80℃, and the outlet moisture is 12%-13%.

7. The method of claim 1, wherein, In step (2), in the third leaf conditioning, the outlet temperature is 40℃-50℃, and the outlet moisture is 18%-20%.

8. The method of claim 1, wherein, In step (2), the alcoholization is performed at a temperature of 43℃-48℃ and a humidity of 75%-85% for 30 h-36 h.

9. The method of claim 1, wherein, In step (2), in the inactivation, the temperature of the first inactivation zone is 45℃-50℃, the temperature of the second inactivation zone is 50℃-55℃, the temperature of the third inactivation zone is 50℃-55℃, the temperature of the fourth inactivation zone is 50℃-55℃, the temperature of the fifth inactivation zone is 45℃-50℃, and the temperature of the sixth inactivation zone is 40℃-45℃.

10. The method of claim 1, wherein, In step (3), in the loose rehydrating, the temperature of the hot air return is 57℃-63℃, and the outlet moisture is 19%-21%.

11. The method of claim 1, wherein, In the baking of step (3), the hot air temperature of the baking first zone is 100-110℃, the hot air temperature of the baking second zone is 125-135℃, the hot air temperature of the baking third zone is 100-110℃, and the moisture of the baking outlet is 12-13%.

12. Use of the method according to any one of claims 1-11 in the processing of aged air-cured tobacco.

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