Cigar coat tobacco leaf fermentation method

Abstract

The invention relates to the technical field of cigar processing, and discloses a cigar coat tobacco leaf fermentation method. The cigar is formed by combining a cigar core, a cigar sleeve and a cigar coat. The cigar coating is a tobacco leaf on the outermost layer of the cigar and is an important evaluation index of the appearance quality of the cigar. According to the fermentation method, the tobacco leaves are hung for fermentation, no extrusion exists between the tobacco leaves, the situation that pressed oil is formed on the surfaces of the tobacco leaves and influences the appearance quality of the tobacco leaves is avoided, the cigar tobacco leaves obtained through fermentation are good in appearance uniformity, and the fermentation method is especially suitable for fermentation of cigar raw materials such as cigar coats with high appearance requirements.

Description

Technical Field

[0001] The invention relates to the technical field of cigar processing, and in particular to a method for fermenting cigar wrapper tobacco leaves. Background Art

[0002] Cigars are composed of three parts: the cigar core, the cigar wrapper and the cigar wrapper. The cigar wrapper is the outermost layer of tobacco leaves and is an important indicator of the appearance quality of the cigar.

[0003] Cigar tobacco leaf fermentation is a crucial part of the cigar production process. Through fermentation, tobacco leaves become softer and more elastic, and processing performance is improved. At the same time, through fermentation, the irritating components in the tobacco leaves are decomposed, the aroma of the tobacco leaves is released, the taste is more mellow, and the bitterness and irritation are reduced, bringing consumers a more pleasant smoking experience. The fermentation of cigar tobacco leaves is divided into agricultural fermentation and industrial fermentation. The purpose of agricultural fermentation is to improve the quality of raw materials and meet the needs of industrial allocation. It is usually carried out by stacking fermentation. Industrial fermentation is the secondary fermentation of cigar raw materials after entering the factory. Its purpose is to meet the product style characteristics with brand as the core. According to the characteristics of raw materials and processing requirements, the fermentation forms are more diverse, such as stacking fermentation, box fermentation, pressure fermentation, medium fermentation, etc.

[0004] Wrapper tobacco plays a vital role in the cigar making process. As the "face value" of cigars, there are extremely high requirements for its appearance quality and physical properties. Regarding the fermentation of cigar wrapper tobacco, agricultural production generally adopts the method of pile fermentation, and industrial production generally adopts the method of box fermentation. Both of these fermentation methods have certain defects, including the following three aspects: The heating effect of tobacco leaves cannot be guaranteed, and the fermentation effect and uniformity are poor; The pressure between the tobacco leaves will form compressed oil on the surface of the tobacco leaves, affecting the appearance quality of the wrapper tobacco leaves; In addition, during the fermentation process of the above two fermentation methods, as the moisture content of the tobacco leaves decreases and the tobacco leaves are turned over many times, the tobacco leaves will be broken into pieces, affecting the integrity and yield of the tobacco leaves. Summary of the invention

[0005] In order to solve the problems of poor fermentation uniformity and poor fermentation oil conversion of cigar wrapper tobacco leaves, the present invention provides a cigar wrapper tobacco leaf fermentation method. The present invention suspends tobacco leaves for fermentation without squeezing between tobacco leaves, thereby avoiding the formation of compressed oil on the surface of tobacco leaves that affects the appearance quality of tobacco leaves. The cigar tobacco leaves obtained by fermentation have good appearance uniformity. At the same time, based on the characteristics of hanging fermentation, the present invention provides a fermentation process suitable for hanging fermentation.

[0006] The specific technical scheme of the present invention is: In one aspect, the present invention provides a method for fermenting cigar wrapper tobacco leaves, comprising the following steps: Step S1: Hanging the wrapper tobacco leaves; Step S2: moistening the wrapper tobacco leaves by high-temperature atomization to make the moisture content of the wrapper tobacco leaves 30-35%; Step S3: setting the ambient temperature of the wrapper tobacco leaves to 50-55° C. and the relative humidity to 72-78% to promote moisture balance of the wrapper tobacco leaves; Step S4: setting the ambient temperature of the wrapper tobacco leaves to 42-48° C. and the relative humidity to 70-75% to ferment the wrapper tobacco leaves.

[0007] The present invention ferments tobacco leaves by hanging them up without squeezing the tobacco leaves, thereby avoiding the formation of compressed oil on the surface of the tobacco leaves that affects the appearance quality of the tobacco leaves. The cigar tobacco leaves fermented in this way have good uniformity in appearance. The method of the present invention is particularly suitable for fermenting cigar raw materials such as cigar wrappers that have high requirements on appearance.

[0008] Furthermore, in view of the characteristic of the present invention that the tobacco leaves hung for fermentation are not squeezed, the present invention adjusts the moisture balance temperature to 50-55°C and the fermentation temperature to 42-48°C, thereby promoting the improvement of the oil conversion of the tobacco leaves during the fermentation process under higher temperature conditions, thereby maintaining the fermentation quality at a higher level, and the fermented tobacco leaves are dark brown and have sufficient oil.

[0009] The moisture balance temperature is set to 50~55℃ and the relative humidity is set to 72~78%. In this high temperature and high humidity environment, the moisture balance between and within the tobacco leaves is promoted, which is beneficial to the conversion of oil.

[0010] Due to the long fermentation cycle, the probability of high-moisture materials becoming moldy is relatively high. However, the wrapper tobacco leaves of the present invention can only be fermented at a higher moisture content to achieve effective conversion of the oil in the non-squeezed tobacco leaves. Therefore, after many experiments, the present invention found that setting the fermentation temperature to 42-48°C and the relative humidity to 70-75% can prevent the fermentation process from becoming moldy while maintaining a higher moisture content of the wrapper tobacco leaves.

[0011] As a preferred embodiment of the above-mentioned wrapper tobacco fermentation method, in step S1, the hanging method is: shake the tobacco leaves loosely, hang them with the leaf tips facing downward and the leaf bases facing upward, and control the distance between the tobacco leaves to be 3-8 cm. The hanging distance of the upper and lower layers of tobacco leaves is controlled according to the length of the tobacco leaves, and the distance between the leaf tips of the upper layer and the leaf bases of the lower layer of tobacco leaves is controlled to be 5-10 cm.

[0012] The above hanging method can make the tobacco leaves hang at an appropriate density. If the tobacco leaves are hung too densely, it will affect the uniformity of moisture diffusion in the subsequent high-temperature atomization and humidification process. If the tobacco leaves are hung too loosely, it will be unfavorable for the moisture retention of the tobacco leaves during the fermentation process, affecting the fermentation capacity.

[0013] As a preferred embodiment of the above-mentioned wrapper tobacco leaf fermentation method, in step S2, the liquid for moistening is a mixture of pure water, organic polyols and microbial preparations.

[0014] More preferably, based on the total mass of the liquid for moistening, the mass concentration of the organic polyol is 3% to 6%, and the organic polyol is one or more of propylene glycol, glycerol, polyethylene glycol, and sorbitol.

[0015] More preferably, the amount of the microbial preparation is 2% to 7% of the mass of the tobacco leaves.

[0016] More preferably, the microbial preparation is Bacillus subtilis ( Bacillus licheniformis ) and Brevibacterium paracoagulans ( Brahybacterium paraconglomeratum ) mixed.

[0017] Bacillus licheniformis is a macromolecular substance degrading bacterium such as starch, protein, cellulose, etc. The present invention promotes the conversion of macromolecular substances in tobacco leaves by adding Bacillus licheniformis for fermentation. At the same time, the present invention can degrade polyphenols and improve the aroma of tobacco leaves by adding Brevibacillus paracoagulans. The combined action of Bacillus licheniformis and Brevibacillus paracoagulans can promote the conversion of oil content in tobacco leaf fermentation of the present invention. Bacillus licheniformis and Brevibacillus paracoagulans are microbial strains suitable for the fermentation conditions of the present invention that are screened by researchers of the present invention from a large number of macromolecular substance degrading bacteria.

[0018] More preferably, the mixing mass ratio of Bacillus subtilis licheniformis and Brevibacillus paracoagulans is preferably 1:1 to 1.5.

[0019] As a preferred embodiment of the above-mentioned wrapper tobacco leaf fermentation method, in step S3, the moisture balance time is 36 to 60 hours.

[0020] As a preferred embodiment of the above-mentioned wrapper tobacco leaf fermentation method, in step S4, the fermentation time is 15 to 25 days.

[0021] As a preferred embodiment of the above-mentioned wrapper tobacco fermentation method, in step S4, the fermentation process is humidified using the humidification method of step S2 according to the moisture content of the tobacco leaves, so as to maintain the moisture content of the tobacco leaves not less than 27% during the fermentation process.

[0022] The fermentation process of the present invention is a high-temperature and high-humidity fermentation process. The purpose of making the moisture content of tobacco leaves not less than 27% during the fermentation process is to prevent the aroma from being lost due to too low moisture content, thereby affecting the fermentation effect.

[0023] On the other hand, based on the above fermentation method, the present invention provides a cigar tobacco leaf, which is obtained by fermentation using the above fermentation method.

[0024] Compared with the prior art, the present invention has the following technical effects: (1) The present invention ferments tobacco leaves by hanging them up, without squeezing the tobacco leaves, thereby preventing the formation of pressed oil on the surface of the tobacco leaves that affects the appearance quality of the tobacco leaves. The cigar tobacco leaves fermented in this way have good uniformity in appearance. The method of the present invention is particularly suitable for fermenting cigar raw materials such as cigar wrappers that have high requirements for appearance.

[0025] (2) In view of the fact that the tobacco leaves are not squeezed during the suspended fermentation of the present invention, the present invention uses a mixed liquid of pure water, organic polyols, and microbial preparations to add moisture by high-temperature atomization to promote the improvement of tobacco leaf oil content. The coordinated effect between the organic polyols, microbial preparations, and the high-temperature environment effectively promotes the conversion of tobacco leaf oil content, greatly promoting the improvement of fermentation quality. Specifically, since the tobacco leaves are not squeezed during the suspended fermentation, the oil conversion will be greatly weakened compared to the pile fermentation, and the fermentation process will be completely dependent on the ambient temperature and humidity. The present invention adjusts the water balance temperature to 50-55°C and the fermentation temperature to 42-48°C, and then adds a specific content of organic polyols propylene glycol, glycerol, polyethylene glycol, and sorbitol to promote the improvement of tobacco leaf oil conversion during the fermentation process. In addition, the effects of Bacillus subtilis and Bacillus paracoagulans are combined to keep the fermentation quality of tobacco leaves at a high level without squeezing, and the fermented tobacco leaves are dark brown and have sufficient oil content. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a comparison of the appearance of the cigarine wrappers fermented in Example 1 and Comparative Example 1, wherein the cigarette on the left is the cigarine wrapper prepared in Example 1, and the cigarette on the right is the cigarine wrapper prepared in Comparative Example 1. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with embodiments. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work should belong to the scope of protection of the present invention.

[0028] Example 1 Provided is a cigar wrapper obtained by fermentation according to the following method: Step S1: Hang the wrapper tobacco leaves, specifically by shaking the tobacco leaves loose and spreading them flat, and then evenly hanging them on the tobacco fermentation rack with the leaf tips facing downward and the leaf bases facing upward. The distance between the tobacco leaves is controlled at 5 cm, and the distance between the upper and lower tobacco hanging racks is controlled according to the length of the tobacco leaves. The distance between the leaf tips of the upper layer and the leaf bases of the lower layer is controlled at 8 cm.

[0029] Step S2: by means of high-temperature atomization, the cigar wrapper tobacco leaves are moistened with a mixture of pure water, organic polyols and microbial preparations, so that the moisture content of the cigar wrapper tobacco leaves is 32%. The amount of pure water is calculated based on the required moisture content of the tobacco leaves; the amount of the microbial preparation is 5% of the tobacco leaves' mass, and the microbial preparation is obtained by mixing Bacillus subtilis and Brevibacillus paracoagulans in a mass ratio of 1:1.2; the mass concentration of the organic polyol is 5% based on the total mass of the liquid used for moistening, and the organic polyol is glycerol.

[0030] Step S3: The temperature of the fermentation chamber is set to 53° C. and the relative humidity is set to 76%, and the wrapper tobacco leaves are placed in this environment for 52 hours to promote moisture balance of the wrapper tobacco leaves.

[0031] Step S4: The temperature of the fermentation chamber is set to 45°C and the relative humidity is set to 72% to ferment the wrapper tobacco leaves for 20 days. During the fermentation process, the moisture content of the tobacco leaves is kept at no less than 27% by using the moisture addition method of step S2 according to the moisture content of the tobacco leaves.

[0032] Example 2 Provided is a cigar wrapper obtained by fermentation according to the following method: Step S1: Hang the wrapper tobacco leaves, specifically by shaking the tobacco leaves loose and spreading them flat, and then evenly hanging them on the tobacco fermentation rack with the leaf tips facing downward and the leaf bases facing upward. The distance between the tobacco leaves is controlled at 3 cm, and the distance between the upper and lower tobacco hanging racks is controlled according to the length of the tobacco leaves. The distance between the leaf tips of the upper layer and the leaf bases of the lower layer is controlled at 5 cm.

[0033] Step S2: by means of high-temperature atomization, the cigar wrapper tobacco leaves are moistened with a mixture of pure water, organic polyols and microbial preparations, so that the moisture content of the cigar wrapper tobacco leaves is 30%. The amount of pure water is calculated based on the required moisture content of the tobacco leaves; the amount of the microbial preparation is 3% of the tobacco leaves' mass, and the microbial preparation is obtained by mixing Bacillus subtilis and Brevibacillus paracoagulans in a mass ratio of 1:1.5; the mass concentration of the organic polyol is 2% based on the total mass of the liquid for moistening, and the organic polyol is propylene glycol.

[0034] Step S3: The temperature of the fermentation chamber is set to 50° C. and the relative humidity is set to 72%, and the wrapper tobacco leaves are placed in this environment for 52 hours to promote moisture balance of the wrapper tobacco leaves.

[0035] Step S4: The temperature of the fermentation chamber is set to 48°C and the relative humidity is set to 70% to ferment the wrapper tobacco leaves for 25 days. During the fermentation process, the moisture content of the tobacco leaves is kept at no less than 27% by using the moisture addition method of step S2 according to the moisture content of the tobacco leaves.

[0036] Example 3 Provided is a cigar wrapper obtained by fermentation according to the following method: Step S1: Hang the wrapper tobacco leaves, specifically by shaking the tobacco leaves loose and spreading them flat, and then evenly hanging them on the tobacco fermentation rack with the leaf tips facing downward and the leaf bases facing upward. The distance between the tobacco leaves is controlled at 8 cm, and the distance between the upper and lower tobacco hanging racks is controlled according to the length of the tobacco leaves. The distance between the leaf tips of the upper layer and the leaf bases of the lower layer is controlled at 10 cm.

[0037] Step S2: by means of high-temperature atomization, the cigar wrapper tobacco leaves are moistened with a mixture of pure water, organic polyols and microbial preparations, so that the moisture content of the cigar wrapper tobacco leaves is 35%. The amount of pure water is calculated according to the required moisture content of the tobacco leaves; the amount of the microbial preparation is 6% of the tobacco leaves, and the microbial preparation is obtained by mixing Bacillus subtilis and Brevibacillus paracoagulans in a mass ratio of 1:1.0; the mass concentration of the organic polyol is 7% based on the total mass of the liquid for moistening, and the organic polyol is glycerol.

[0038] Step S3: The temperature of the fermentation chamber is set to 55° C. and the relative humidity is set to 78%, and the wrapper tobacco leaves are placed in this environment for 52 hours to promote moisture balance of the wrapper tobacco leaves.

[0039] Step S4: The temperature of the fermentation chamber is set to 42°C and the relative humidity is set to 75% to ferment the wrapper tobacco leaves for 25 days. During the fermentation process, the moisture content of the tobacco leaves is kept at no less than 27% by using the moisture addition method of step S2 according to the moisture content of the tobacco leaves.

[0040] Example 4 A cigar wrapper is provided, and the fermentation method is different from that in Example 1, except that the organic polyol used for moisturizing is polyethylene glycol. Other aspects are the same as those in Example 1.

[0041] Example 5 A cigar wrapper is provided, and the fermentation method is different from that of Example 1, except that the organic polyol used for moisturizing is sorbitol. Other aspects are the same as those of Example 1.

[0042] Comparative Example 1 This comparative example provides a cigar wrapper, and the fermentation method is different from that of Example 1, except that: Step S1 is "stacking the wrapper tobacco leaves, and the stacking method is as follows: the tobacco leaves are stacked into a stack of 1.2 meters long, 1.2 meters wide, and 1.2 meters high, and the distance between each two stacks is 50 centimeters." The rest is the same as Example 1.

[0043] Comparative Example 2 This comparative example provides a cigar wrapper, and the fermentation method is different from that of Example 1, except that the water balance is promoted in step S3 under the temperature environment of the fermentation process, and step S3 is "setting the temperature of the fermentation chamber to 45° C. and the relative humidity to 65%". The rest is the same as Example 1.

[0044] Comparative Example 3 This comparative example provides a cigar wrapper, and the fermentation method is different from that of Example 1, except that step S4 is "setting the temperature of the fermentation chamber to 40° C. and the relative humidity to 65%". The rest is the same as Example 1.

[0045] Comparative Example 4 This comparative example provides a cigar wrapper, and the fermentation method is different from that of Example 1, except that the mass concentration of the organic polyol is 1%. Other aspects are the same as those of Example 1.

[0046] Comparative Example 5 This comparative example provides a cigar wrapper, and the fermentation method is different from that of Example 1, except that the mass concentration of the organic polyol is 10%. Others are the same as those of Example 1.

[0047] Comparative Example 6 This comparative example provides a cigar wrapper, and the fermentation method is different from that of Example 1 except that Bacillus subtilis is not added. Other aspects are the same as those of Example 1.

[0048] Comparative Example 7 This comparative example provides a cigar wrapper, and the fermentation method is different from that of Example 1, except that Brevibacterium paracoagulans is not added. Other aspects are the same as those of Example 1.

[0049] Performance Evaluation 1. The cigar wrappers obtained in Example 1 and Comparative Example 1 were rolled into cigarettes and their appearances were compared. The results are shown in Table 1. Figure 1 , wherein the cigarette on the left is the cigar wrapper prepared in Example 1, and the cigarette on the right is the cigar wrapper prepared in Comparative Example 1.

[0050] Depend on Figure 1It can be seen that the left cigarette is dark brown, close to black, with uniform color, good oil content, and strong oiliness; the right cigarette is brown, with mottled surface of the wrapper, and the color of the wrapper is uneven. It can be seen that in Example 1, the tobacco leaves are hung up for fermentation, and there is no squeezing between the tobacco leaves to avoid the formation of compressed oil on the surface of the tobacco leaves that affects the appearance quality of the tobacco leaves. The cigar tobacco leaves obtained by fermentation have good uniformity in appearance.

[0051] 2. The wrapper tobacco leaves can be divided into seven categories according to the color depth. The darker the color, the better the oil content. The wrapper tobacco leaves obtained in Examples 1 to 5 and Comparative Examples 1 to 7 were evaluated for their appearance and color. The results are shown in Table 1.

[0052] Table 1 Appearance and color of wrapper tobacco leaves Example 1 Dark brown, uniform color, good oil content, good gloss Example 2 Dark brown, uniform color, good oil content, good gloss Example 3 Brown, uniform color, good oil content, good gloss Example 4 Nearly black, uniform color, good oil content, strong gloss Example 5 Dark brown, uniform color, good oil content, good gloss Comparative Example 1 Brown, uneven color, average oil content, poor gloss Comparative Example 2 Brown, uneven color, poor oil content, poor gloss Comparative Example 3 Brown, uneven color, poor oil content, poor gloss Comparative Example 4 Brown, uneven color, poor oil content, poor gloss Comparative Example 5 Dark brown, uniform color, average oil content, average gloss Comparative Example 6 Brown, uniform color, average oil content, poor gloss Comparative Example 7 Brown, uniform color, poor oil content, poor gloss From Table 1, we can see that: (1) As can be seen from the appearance color of the cigar wrapper in Examples 1 to 5, the present invention ferments tobacco leaves by hanging them up, without squeezing the tobacco leaves, to avoid the formation of compressed oil on the surface of the tobacco leaves that affects the appearance quality of the tobacco leaves. The cigar tobacco leaves fermented in this way have good appearance uniformity. Furthermore, in view of the fact that the tobacco leaves are not squeezed during the fermentation, the present invention adjusts the moisture balance temperature to 50-55°C and the fermentation temperature to 42-48°C to promote the improvement of the oil conversion of the tobacco leaves during the fermentation process under higher temperature conditions, so that the fermentation quality is maintained at a higher level. The fermented tobacco leaves are dark brown and have sufficient oil. In the fermentation method of the present invention, the optimal embodiment 4 is implemented, and the color of the cigar wrapper can reach nearly black.

[0053] (2) From the comparative analysis of Comparative Example 1 and Example 1, it can be seen that the advantages of the hanging fermentation of the present invention are that the tobacco leaves are hung for fermentation without squeezing between the tobacco leaves, thus avoiding the formation of pressed oil on the surface of the tobacco leaves that affects the appearance quality of the tobacco leaves. The cigar tobacco leaves obtained by fermentation have good uniformity in appearance. (3) By comparing Comparative Examples 2 to 7 with Example 1, it can be seen that in Comparative Example 2, the temperature and humidity for water balance are lowered, in Comparative Example 3, the temperature and humidity for fermentation are lowered, in Comparative Example 4, the amount of organic polyol added is lowered to 1%, in Comparative Example 5, the amount of organic polyol added is increased to 10%, in Comparative Example 6, Bacillus subtilis is not added, and in Comparative Example 7, Brevibacillus paracoagulans is not added. The fermentation color depth or appearance uniformity of Comparative Examples 2 to 7 decreases to varying degrees. Comparative Examples 2 to 4 mainly affect the uniformity of the appearance of the aubergine wrapper, while Comparative Examples 5 to 7 have a greater impact on the fermentation color depth.

[0054] Furthermore, by comparing comparative examples 5 to 7 with Example 1, it can be seen that, in view of the characteristic of the present invention that the tobacco leaves are not squeezed during the suspended fermentation, the present invention uses a mixed liquid of pure water, organic polyols, and microbial preparations to add moisture by high-temperature atomization to promote the improvement of tobacco leaf oil content, wherein the organic polyols, microbial preparations, and high-temperature environment cooperate to effectively promote the conversion of tobacco leaf oil content, greatly promoting the improvement of fermentation quality. By comparing comparative examples 2 to 4 with Example 1, it can be seen that the present invention is conducive to promoting the uniform conversion of the color of the wrapper tobacco leaves and the conversion of oil content by adjusting the moisture balance temperature to 50-55°C and the fermentation temperature to 42-48°C. This shows that since there is no squeezing between the hanging tobacco leaves, the oil conversion will be greatly weakened compared with the piled fermentation, and the fermentation process will completely depend on the ambient temperature and humidity. The present invention adjusts the moisture balance temperature to 50-55°C and the fermentation temperature to 42-48°C, and then adds specific contents of organic polyols propylene glycol, glycerol, polyethylene glycol, and sorbitol to promote the improvement of the oil conversion of the tobacco leaves during the fermentation process, and cooperates with the effects of Bacillus subtilis and Brevibacillus paracoagulans, so that the fermentation quality of the tobacco leaves is maintained at a high level without squeezing, and the fermented tobacco leaves are dark brown and have sufficient oil.

[0055] The concentration of the Bacillus subtilis microbial preparation used in the present invention is 8.17×10 10 CFU / mL, purchased from Meize Biological Reagent Business Department, Wuchang District, Wuhan City, specification model MZ317477.1. The concentration of the microbial preparation of Brevibacterium paracoagulans used in the embodiment of the present invention is 6.34×10 10 CFU / mL, purchased from Shanghai Xuanya Biotechnology Co., Ltd.

[0056] The raw materials and equipment used in the present invention, unless otherwise specified, are all commonly used raw materials and equipment in the art; the methods used in the present invention, unless otherwise specified, are all conventional methods in the art.

[0057] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A cigar wrapper tobacco fermentation method, characterized in that: The following steps are involved: Step S1: Hanging the wrapper tobacco leaves; Step S2: moistening the wrapper tobacco leaves by high-temperature atomization to make the moisture content of the wrapper tobacco leaves 30-35%; Step S3: setting the ambient temperature of the wrapper tobacco leaves to 50-55° C. and the relative humidity to 72-78% to promote moisture balance of the wrapper tobacco leaves; Step S4: setting the ambient temperature of the wrapper tobacco leaves to 42-48° C. and the relative humidity to 70-75% to ferment the wrapper tobacco leaves.

2. A cigar wrapper tobacco fermentation method as claimed in claim 1, characterized in that: In step S1, the hanging method is: shake the tobacco leaves loosely, hang them with the tips facing down and the bases facing up, control the distance between the tobacco leaves to be 3-8 cm, control the hanging distance between the upper and lower layers of tobacco leaves according to the length of the tobacco leaves, and control the distance between the tips of the upper layer of tobacco leaves and the bases of the lower layer of tobacco leaves to be 5-10 cm.

3. The method for fermenting cigar wrapper tobacco leaves according to claim 1, characterized in that: In step S2, the liquid for adding moisture is a mixture of pure water, organic polyols and microbial preparations.

4. A cigar wrapper tobacco fermentation method as claimed in claim 3, characterized in that: Based on the total mass of the liquid for moistening, the mass concentration of the organic polyol is 3% to 6%, and the organic polyol is one or more of propylene glycol, glycerol, polyethylene glycol, and sorbitol.

5. The method for fermenting cigar wrapper tobacco leaves according to claim 3, characterized in that: The dosage of the microbial preparation is 2% to 7% of the mass of the tobacco leaves, and the microbial preparation is obtained by mixing Bacillus subtilis licheniformis and Brevibacillus paracoagulans.

6. A cigar wrapper tobacco fermentation method as claimed in claim 3 or 5, characterized in that: The microbial preparation is obtained by mixing Bacillus subtilis licheniformis and Brevibacillus paracoagulans in a mass ratio of 1:1-1.

5.

7. The method for fermenting cigar wrapper tobacco leaves according to claim 1, characterized in that: In step S3, the water balance time is 36 to 60 hours.

8. The method for fermenting cigar wrapper tobacco leaves according to claim 1, characterized in that: In step S4, the fermentation time is 15 to 25 days.

9. A cigar wrapper tobacco fermentation method as claimed in claim 1 or 8, characterized in that: In step S4, the fermentation process is humidified according to the moisture content of the tobacco leaves using the humidification method of step S2 to maintain the moisture content of the tobacco leaves during the fermentation process at no less than 27%.

10. Cigar tobacco obtained by fermentation according to the fermentation method according to any one of claims 1 to 9.

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