Cigar wrapper tobacco leaf fermentation method

Abstract

The present invention relates to the technical field of cigar processing and discloses a method for fermenting cigar wrapper tobacco leaves. A cigar is composed of a filler, a binder, and a wrapper. The wrapper is the outermost layer of the tobacco leaves and is an important indicator of the cigar's appearance quality. By suspending the tobacco leaves for fermentation, the method eliminates squeezing between the leaves and prevents the formation of compressed oil on the leaf surface that could affect the appearance quality of the leaves. The fermented cigar tobacco leaves thus obtained have a uniform appearance. The fermentation method of the present invention is particularly suitable for fermenting cigar raw materials such as cigar wrappers, which have high requirements for appearance.

Description

Technical Field

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

[0002] A cigar is made up of three parts: the filler, the binder, and the wrapper. The wrapper is the outermost layer of tobacco leaves and is an important indicator of the cigar's appearance and quality.

[0003] Cigar tobacco leaf fermentation is a crucial step in the cigar production process. Fermentation makes the tobacco leaves softer and more elastic, improving processing performance. At the same time, fermentation decomposes the irritating components in the tobacco leaves, releasing their aroma and mellowing their taste, reducing bitterness and irritation, and providing consumers with a more pleasant smoking experience. Cigar tobacco leaf fermentation is divided into agricultural fermentation and industrial fermentation. Agricultural fermentation aims to improve the quality of raw materials and meet industrial allocation needs, usually using pile fermentation. Industrial fermentation is a secondary fermentation of cigar raw materials after they enter the factory. Its purpose is to meet the brand-centric product style and characteristics. Based on the characteristics of the raw materials and processing requirements, the fermentation methods are more diverse, such as pile fermentation, box fermentation, pressure fermentation, and medium fermentation.

[0004] Wrapper tobacco plays a crucial role in the cigar-making process. As the face of the cigar, its appearance, quality, and physical properties are highly demanding. Agricultural production typically uses a pile fermentation method, while industrial production typically uses a boxed fermentation method. Both methods have drawbacks, including the following:

[0005] The heating effect of tobacco leaves cannot be guaranteed, and the fermentation effect and uniformity are poor;

[0006] 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;

[0007] 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, affecting the integrity and leaf yield of the tobacco leaves. Summary of the Invention

[0008] To address the aforementioned issues of poor fermentation uniformity and fermentation oil conversion in cigar wrapper tobacco leaves, the present invention provides a method for fermenting cigar wrapper tobacco leaves. By hanging the tobacco leaves for fermentation, there is no squeezing between the leaves, thus preventing the formation of compressed oil on the leaf surface that could affect the appearance quality of the leaves. The resulting fermented cigar tobacco leaves exhibit a uniform appearance. Furthermore, based on the characteristics of hanging fermentation, the present invention provides a fermentation process suitable for hanging fermentation.

[0009] The specific technical solutions of the present invention are:

[0010] In one aspect, the present invention provides a method for fermenting cigar wrapper tobacco leaves, comprising the following steps:

[0011] Step S1: Hanging the wrapper tobacco leaves;

[0012] Step S2: moistening the wrapper tobacco leaves by high-temperature atomization to reduce the moisture content of the wrapper tobacco leaves to 30-35%;

[0013] 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 in the wrapper tobacco leaves;

[0014] Step S4: The ambient temperature of the wrapper tobacco leaves is set to 42-48° C. and the relative humidity is set to 70-75% to ferment the wrapper tobacco leaves.

[0015] 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.

[0016] Furthermore, in view of the characteristic of the present invention that the tobacco leaves are not squeezed during hanging fermentation, 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. The fermented tobacco leaves are dark brown and have sufficient oil content.

[0017] 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.

[0018] Due to the long fermentation cycle, high-moisture materials are more likely to become moldy. However, the wrapper tobacco leaves of the present invention can only be fermented at a higher moisture content to achieve effective conversion of oil in the non-squeezed tobacco leaves. Therefore, after multiple 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.

[0019] As a preferred embodiment of the above-mentioned wrapper tobacco fermentation method, in step S1, the hanging placement method is: loosen the tobacco leaves by shaking them, and hang them with the leaf tips facing down and the leaf bases facing up. The distance between the tobacco leaves is controlled at 3 to 8 cm, and the hanging distance of the upper and lower layers of tobacco leaves 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 of tobacco leaves is controlled at 5 to 10 cm.

[0020] The above hanging method can ensure that the tobacco leaves are hung at an appropriate density. If the tobacco leaves are hung too densely, it will affect the uniformity of moisture diffusion during the subsequent high-temperature atomization and humidification process. If the tobacco leaves are hung too loosely, it will not be conducive to the moisture retention of the tobacco leaves during the fermentation process, affecting the fermentation capacity.

[0021] As a preferred embodiment of the above-mentioned wrapper tobacco fermentation method, in step S2, the liquid for moistening is a mixture of purified water, organic polyols, and microbial preparations.

[0022] More preferably, the mass concentration of the organic polyol is 3% to 6% based on the total mass of the liquid for adding moisture, and the organic polyol is one or more of propylene glycol, glycerol, polyethylene glycol, and sorbitol.

[0023] More preferably, the amount of the microbial preparation is 2% to 7% of the mass of the tobacco leaves.

[0024] More preferably, the microbial preparation is Bacillus subtilis ( Bacillus licheniformis ) and Brevibacterium paracoagulans ( Brahybacterium

[0025] paraconglomeratum ) mixed.

[0026] Bacillus subtilis licheniformis is a microorganism that degrades macromolecules such as starch, protein, and cellulose. The present invention promotes the conversion of macromolecules in tobacco leaves by adding Bacillus subtilis to the fermentation process. Simultaneously, the addition of Brevibacterium paracoagulans can degrade polyphenols and improve the aroma of the tobacco leaves. The combined action of Bacillus subtilis licheniformis and Brevibacterium paracoagulans can promote the conversion of oil in the tobacco leaf fermentation process. Bacillus subtilis licheniformis and Brevibacterium paracoagulans are microbial strains that were screened by researchers from numerous macromolecule-degrading bacteria to be suitable for the fermentation conditions of the present invention.

[0027] More preferably, the mixing mass ratio of Bacillus subtilis licheniformis and Brevibacterium paracoagulans is preferably 1:1 to 1.5.

[0028] 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.

[0029] As a preferred embodiment of the above-mentioned wrapper tobacco leaf fermentation method, in step S4, the fermentation time is 15 to 25 days.

[0030] 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 at not less than 27% during the fermentation process.

[0031] The fermentation process of the present invention is a high-temperature and high-humidity fermentation process. The purpose of making the moisture content of the tobacco leaves during the fermentation process not lower than 27% is to prevent the aroma from being lost due to too low moisture, which affects the fermentation effect.

[0032] 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.

[0033] Compared with the prior art, the present invention has the following technical effects:

[0034] (1) The present invention ferments tobacco leaves by hanging them up, without squeezing the tobacco leaves, thereby 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 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.

[0035] (2) In view of the fact that the tobacco leaves are not squeezed during the hanging 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 hanging, their oil conversion will be greatly weakened compared to piled fermentation, and their fermentation process will be completely dependent 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 amounts of organic polyols such as propylene glycol, glycerol, polyethylene glycol, and sorbitol to promote the improvement of tobacco leaf oil content during the fermentation process. In combination with the effects of Bacillus subtilis and Brevibacillus paracoagulans, 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 content. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a comparison of the appearance of the cigar wrappers fermented in Example 1 and Comparative Example 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. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the following embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only a portion of the embodiments of the present invention, rather than all of the embodiments. Therefore, all other embodiments derived by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0038] Example 1

[0039] A cigar wrapper is provided, which is obtained by fermentation according to the following method:

[0040] Step S1: Hang the wrapper tobacco leaves. The specific method is: shake the tobacco leaves loose and spread them flat, and then hang them evenly on the tobacco fermentation rack with the leaf tips facing down and the leaf bases facing up. The distance between the tobacco leaves is controlled at 5 cm. 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.

[0041] Step S2: Using high-temperature atomization, the wrapper tobacco leaves are moistened with a mixture of purified water, an organic polyol, and a microbial preparation to a moisture content of 32%. The amount of purified water is calculated based on the mass of the tobacco leaves to achieve the desired moisture content. The amount of the microbial preparation is 5% of the tobacco leaf mass, and the microbial preparation is a mixture of Bacillus subtilis and Brevibacterium paracoagulans in a mass ratio of 1:1.2. The mass concentration of the organic polyol is glycerol, which is 5% based on the total mass of the moistening liquid.

[0042] 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.

[0043] Step S4: The temperature in the fermentation chamber is set to 45°C and the relative humidity to 72% to ferment the wrapper tobacco leaves for 20 days. During the fermentation process, the moisture content of the tobacco leaves is maintained at or above 27% using the humidification method described in Step S2, depending on the moisture content of the leaves.

[0044] Example 2

[0045] A cigar wrapper is provided, which is obtained by fermentation according to the following method:

[0046] Step S1: Hang the wrapper tobacco leaves. The specific method is: shake the tobacco leaves loose and spread them flat, and then hang them evenly on the tobacco fermentation rack with the leaf tips facing down and the leaf bases facing up. The distance between the tobacco leaves is controlled at 3 cm. 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.

[0047] Step S2: Using high-temperature atomization, the wrapper tobacco leaves are moistened with a mixture of purified water, an organic polyol, and a microbial preparation to a moisture content of 30%. The amount of purified water is calculated based on the mass of the tobacco leaves to achieve the desired moisture content. The amount of the microbial preparation is 3% of the tobacco leaf mass, and the microbial preparation is a mixture of Bacillus subtilis and Brevibacterium paracoagulans in a mass ratio of 1:1.5. The mass concentration of the organic polyol is propylene glycol, and is 2% based on the total mass of the moistening liquid.

[0048] 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.

[0049] Step S4: The temperature in the fermentation chamber is set to 48°C and the relative humidity to 70% to ferment the wrapper tobacco leaves for 25 days. During the fermentation process, the moisture content of the tobacco leaves is maintained at or above 27% using the humidification method described in Step S2, depending on the moisture content of the leaves.

[0050] Example 3

[0051] A cigar wrapper is provided, which is obtained by fermentation according to the following method:

[0052] Step S1: Hang the wrapper tobacco leaves. The specific method is: shake the tobacco leaves loosely and spread them flat, and then hang them evenly on the tobacco fermentation rack with the leaf tips facing down and the leaf bases facing up. The distance between the tobacco leaves is controlled at 8 cm. 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.

[0053] Step S2: Using high-temperature atomization, the wrapper tobacco leaves are moistened with a mixture of purified water, an organic polyol, and a microbial preparation to a moisture content of 35%. The amount of purified water is calculated based on the mass of the tobacco leaves to achieve the desired moisture content. The amount of the microbial preparation is 6% of the tobacco leaf mass, and is a mixture of Bacillus subtilis and Brevibacterium paracoagulans in a mass ratio of 1:1.0. The mass concentration of the organic polyol is glycerol, which is 7% based on the total mass of the moistening liquid.

[0054] 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.

[0055] Step S4: The fermentation chamber temperature is set to 42°C and the relative humidity to 75% to ferment the wrapper tobacco leaves for 25 days. During the fermentation process, the moisture content of the tobacco leaves is maintained at or above 27% using the humidification method described in Step S2, depending on the moisture content of the leaves.

[0056] Example 4

[0057] A cigar wrapper is provided. The fermentation method is the same as 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.

[0058] Example 5

[0059] A cigar wrapper is provided. The fermentation method is the same as that of Example 1, except that the organic polyol used for moistening is sorbitol. Other steps are the same as those of Example 1.

[0060] Comparative Example 1

[0061] This comparative example provides a cigar wrapper. The fermentation method is the same as that in Example 1, except that step S1 comprises stacking the wrapper tobacco leaves into stacks 1.2 meters long, 1.2 meters wide, and 1.2 meters high, with a distance of 50 centimeters between each stack. All other steps are the same as those in Example 1.

[0062] Comparative Example 2

[0063] This comparative example provides a cigar wrapper. The fermentation method is the same as that in Example 1, except that the promotion of moisture balance in step S3 is performed under the temperature environment of the fermentation process. Step S3 comprises setting the temperature of the fermentation chamber to 45°C and the relative humidity to 65%. All other aspects are the same as those in Example 1.

[0064] Comparative Example 3

[0065] This comparative example provides a cigar wrapper. The fermentation method is the same as that in Example 1, except that step S4 is "setting the temperature of the fermentation chamber to 40° C. and the relative humidity to 65%." Other aspects are the same as in Example 1.

[0066] Comparative Example 4

[0067] This comparative example provides a cigar wrapper. The fermentation method is the same as that in Example 1, except that the mass concentration of the organic polyol is 1%. All other aspects are the same as those in Example 1.

[0068] Comparative Example 5

[0069] This comparative example provides a cigar wrapper. The fermentation method is the same as that in Example 1, except that the mass concentration of the organic polyol is 10%. Other aspects are the same as those in Example 1.

[0070] Comparative Example 6

[0071] This comparative example provides a cigar wrapper. The fermentation method is the same as that of Example 1 except that Bacillus subtilis is not added. Other aspects are the same as those of Example 1.

[0072] Comparative Example 7

[0073] This comparative example provides a cigar wrapper. The fermentation method is the same as that of Example 1, except that Brevibacterium paracoagulans is not added. Other aspects are the same as those of Example 1.

[0074] Performance evaluation

[0075] 1. Take the wrappers obtained in Example 1 and Comparative Example 1 and roll them into cigarettes. Compare their appearance. Figure 1 , wherein the cigarette on the left is the wrapper prepared in Example 1, and the cigarette on the right is the wrapper prepared in Comparative Example 1.

[0076] Depend on Figure 1 As can be seen, the cigarette on the left is dark brown, almost black, with a uniform color, good oil content, and a strong oily feel. The cigarette on the right is brown, with a mottled surface and uneven wrapper color. This shows that in Example 1, the tobacco leaves were hung for fermentation without squeezing between the leaves, preventing the formation of pressed oil on the leaf surface that affects the appearance quality of the leaves. The fermented cigars have a good uniform appearance.

[0077] 2. Wrapper tobacco leaves can be divided into seven categories based on 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 appearance and color. The results are shown in Table 1.

[0078] Table 1

[0079] 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 Tan, uniform color, poor oil content, poor gloss

[0080] From Table 1 we can see that:

[0081] (1) As can be seen from the appearance of the wrapper in Examples 1 to 5, the present invention, by hanging the tobacco leaves for fermentation, does not squeeze the tobacco leaves, thus avoiding the formation of pressed oil on the tobacco leaf surface 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 characteristic of the present invention that the tobacco leaves are not squeezed during the hanging fermentation, the present invention adjusts the moisture balance temperature to 50-55°C and the fermentation temperature to 42-48°C. Under higher temperature conditions, the oil conversion of the tobacco leaves is promoted during the fermentation process, so that the fermentation quality is maintained at a high level. The fermented tobacco leaves are dark brown and have sufficient oil content. In the fermentation method of the present invention, the optimal embodiment 4 is implemented, and the color of the wrapper can reach nearly black.

[0082] (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 appearance uniformity.

[0083] (3) Comparative analysis of Comparative Examples 2 to 7 with Example 1 shows that Comparative Example 2 lowered the temperature and humidity for water balance, Comparative Example 3 lowered the temperature and humidity for fermentation, Comparative Example 4 lowered the amount of organic polyol added to 1%, Comparative Example 5 increased the amount of organic polyol added to 10%, Comparative Example 6 did not add Bacillus subtilis, and Comparative Example 7 did not add Brevibacillus paracoagulans. The fermentation color depth or appearance uniformity of Comparative Examples 2 to 7 decreased to varying degrees. Comparative Examples 2 to 4 mainly affected the uniformity of the eggplant skin appearance, while Comparative Examples 5 to 7 had a greater impact on the fermentation color depth.

[0084] Furthermore, a comparison of Comparative Examples 5 to 7 with Example 1 demonstrates that, in light of the fact that tobacco leaves are not squeezed during hanging fermentation, the present invention utilizes a mixed liquid of purified water, an organic polyol, and a microbial preparation, atomized at high temperature, to moisten the leaves and promote oil content in the tobacco leaves. The synergistic effect of the organic polyol, the microbial preparation, and the high temperature effectively promotes oil conversion in the tobacco leaves, significantly improving fermentation quality. A comparison of Comparative Examples 2 to 4 with Example 1 demonstrates that, by adjusting the moisture balance temperature to 50-55°C and the fermentation temperature to 42-48°C, the present invention facilitates uniform color conversion and oil conversion in the wrapper tobacco leaves. This shows that since there is no squeezing between the hung tobacco leaves, their oil conversion will be greatly weakened compared with piled fermentation, and the fermentation process will be completely dependent 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 amounts of organic polyols propylene glycol, glycerol, polyethylene glycol, and sorbitol to promote the improvement of tobacco leaf oil conversion during the fermentation process. Combined with the effects of Bacillus subtilis licheniformis and Brevibacillus paracoagulans, 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.

[0085] 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 Brevibacterium paracoagulans microbial preparation used in the examples of the present invention is 6.34×10 10 CFU / mL, purchased from Shanghai Xuanya Biotechnology Co., Ltd.

[0086] Unless otherwise specified, the raw materials and equipment used in the present invention are commonly used in the art; the methods used in the present invention are conventional methods in the art unless otherwise specified.

[0087] 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 fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for fermenting cigar wrapper tobacco leaves, characterized by: The following steps are involved: Step S1: Hanging the wrapper tobacco leaves; Step S2: moistening the wrapper tobacco leaves by high-temperature atomization to reduce the moisture content of the wrapper tobacco leaves to 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 in 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; In step S2, the liquid for adding moisture is a mixture of purified water, organic polyols, and microbial preparations; wherein: The mass concentration of the organic polyol is 3% to 6% based on the total mass of the liquid for moistening, and the organic polyol is one or more of propylene glycol, glycerol, polyethylene glycol, and sorbitol. The amount 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 Brevibacterium paracoagulans. The microbial preparation is obtained by mixing Bacillus subtilis licheniformis and Brevibacterium paracoagulans in a mass ratio of 1:1 to 1.

5. In step S3, the water balance time is 36 to 60 hours; In step S4, the fermentation time is 15 to 25 days.

2. The cigar wrapper tobacco fermentation method according to claim 1, characterized in that: In step S1, the hanging placement method is: shake the tobacco leaves loosely, hang them with the leaf tips facing down and the leaf bases facing up, and control the distance between the tobacco leaves to be 3 to 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 is controlled to be 5 to 10 cm.

3. The method for fermenting cigar wrapper tobacco leaves according to claim 1, wherein: 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 at not less than 27% during the fermentation process.

4. Cigar tobacco obtained by fermentation according to the fermentation method according to any one of claims 1 to 3.

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