A method for moistening cigar tobacco leaves

Abstract

This invention relates to the field of cigar processing technology and discloses a method for moistening cigar tobacco leaves. The method utilizes a pressure difference to drive moistening steam to diffuse deeper into the tobacco stack, improving the uniformity of rehydration. A heating clamp is used to promote the evaporation of surface moisture from the tobacco leaves, preventing moisture from remaining on the surface and reducing the rate of water vapor diffusion into the stack. Furthermore, the heating clamp promotes the evaporation of surface moisture, generating airflow that diffuses inward, helping moisture quickly penetrate deeper into the tobacco leaves and improving rehydration efficiency. Moistening steam is sprayed onto the tobacco leaf surface at a pressure of 0.18~0.25 MPa, which promotes moisture penetration and increases the residence time of moisture, ensuring uniform moisture distribution in the tobacco leaves. Through this method, moisture can be quickly introduced into the deeper layers of the tobacco stack, ensuring increased moisture content in the deeper areas and ultimately achieving the target moisture content evenly and stably.

Description

Technical Field

[0001] This invention relates to the field of cigar processing technology, and in particular to a method for moistening cigar tobacco leaves. Background Technology

[0002] Moistening tobacco leaves is a crucial step in cigar production, influencing their physical properties and fermentation quality, and meeting the moisture requirements of different stages and processes. For example, humidification improves the physical properties of tobacco leaves, making them easier to process and roll. During cigar production, tobacco leaves undergo multiple rolling and shaping processes. If the leaves are too dry, they are prone to breakage during processing, resulting in waste. Appropriate humidification increases the leaves' toughness and elasticity, reducing breakage and improving production efficiency. Furthermore, humidification enhances microbial activity, improving the quality of fermentation. The moisture content of tobacco leaves has a decisive impact on fermentation quality. Appropriate humidification ensures the leaves reach a suitable moisture content, promoting microbial activity and enzyme action, accelerating the transformation and balance of internal chemical components. This transformation not only reduces irritating components and increases aromatic substances but also makes the tobacco flavor richer and the aroma more intense.

[0003] Currently, the most common method for moistening tobacco leaves is natural rehydration, which involves placing the tobacco leaves in a natural environment and allowing them to gradually absorb moisture using the humidity in the air. This method is simple and easy to implement, but it is greatly limited by environmental conditions and the rehydration speed is relatively slow.

[0004] Currently, another common method for moistening tobacco leaves is spraying, which involves using a sprayer to spray fine mist of water droplets onto the surface of the tobacco leaves to increase their surface humidity. This method is simple to operate, but it is difficult to ensure uniformity of moisture application. Care must be taken to control the amount and uniformity of the spray to avoid localized over- or under-moistening.

[0005] The raw materials returned by cigar suppliers are packaged and pressurized, resulting in a low moisture content of approximately 12% to 15% in the tobacco leaves. The leaves are tightly packed, making it difficult for moisture to penetrate into the tobacco leaves using natural rehydration or spray hydration methods. Before hydration, the tobacco leaves need to be loosened manually. Tobacco leaves with low moisture content are brittle, and both the loosening process and the subsequent hydration process can easily cause the tobacco leaves to break. Summary of the Invention

[0006] Currently, the tobacco leaves returned for cigar distribution need to be loosened before being moistened, which easily leads to broken leaves. To solve the problem of difficulty in moistening dense tobacco leaves, this invention provides a method for moistening cigar tobacco leaves.

[0007] The specific technical solution of this invention is as follows:

[0008] In a first aspect, the present invention provides a method for moistening cigar tobacco leaves, comprising the following steps:

[0009] Step S1: In the vacuum chamber, use heating clamps to hold the tobacco leaves and place them in two rows, with a spacing of 30-45 cm between the two rows to form a flow guide space;

[0010] Step S2: Adjust the pressure between the two rows of tobacco leaves to be lower than the pressure on the outer side of the tobacco leaves, thus creating a pressure difference;

[0011] Step S3: Inject humidifying steam into the vacuum chamber to humidify the tobacco leaves. The pressure of the humidifying steam is 0.18~0.25MPa.

[0012] The raw materials for cigars are pressurized for easy transportation, resulting in denser tobacco leaves with a low moisture content, typically 12-15%. Due to their density, existing spray-on humidification methods struggle to penetrate the tobacco leaves. Therefore, the leaves need to be loosened before humidification. However, because of the low moisture content, the leaves are dry and brittle, making them prone to breakage during the loosening process.

[0013] The method provided by this invention utilizes a pressure difference to drive the diffusion of humidifying steam into the deeper layers of the tobacco stack, improving the uniformity of rehydration. A heating clamp is used to promote the evaporation of surface moisture from the tobacco leaves, preventing moisture from remaining on the surface and reducing the rate of water vapor diffusion into the stack. Furthermore, the heating clamp promotes the evaporation of surface moisture, generating airflow that diffuses inward, helping moisture quickly penetrate into the deeper layers of the tobacco leaves and improving rehydration efficiency. Humidifying steam is sprayed onto the surface of the tobacco leaves at a pressure of 0.18~0.25 MPa, which promotes moisture penetration and increases the residence time of moisture, ensuring uniform moisture distribution. The steam pressure should not be too high, otherwise the residence time will be too short, making it difficult to wet the tobacco leaves. Additionally, the pressure difference introduces moisture into the deeper layers of the stack, ensuring increased moisture content in these areas. The heating clamp further enhances the overall moisture content and, while maintaining stable pressure, ensures uniform moisture distribution throughout the entire stack, ultimately achieving the target moisture content.

[0014] A spacing of 30-45 cm between two rows of tobacco leaves helps create a pressure difference between the intervening area and the outer edges of the two rows, facilitating steam penetration into the deeper center of each row. Too large an interval hinders the creation of a pressure difference; too small an interval hinders steam diffusion.

[0015] As a preferred embodiment of the above-mentioned humidification method, in step S3, the temperature of the humidification steam is 50℃~65℃.

[0016] The temperature should be between 50℃ and 65℃ to ensure that the moisture balance of the tobacco leaves is promoted without overheating and affecting their appearance. Excessive steam temperature will cause the formation of steamed flakes, resulting in uneven coloring and darker colors in the steamed areas.

[0017] As a preferred embodiment of the above-mentioned humidification method, in step S2, the pressure difference is 0.03 MPa or higher.

[0018] As a preferred method of the above-mentioned humidification method, the pressure between the two rows of tobacco leaves is 0.09~0.15MPa, and the pressure on the outside of the tobacco leaves is 0.03~0.07MPa.

[0019] As a preferred embodiment of the above-mentioned humidification method, in step S1, the heating temperature of the heating clamp is 45℃~50℃.

[0020] As a preferred embodiment of the above-described humidification method, the humidification steam is selected from ethanol steam and water steam. Further, it is preferable to introduce ethanol steam first, followed by water steam.

[0021] As a preferred method of the above-mentioned moistening method, when moistening, ethanol vapor is first introduced for 0.5 to 2 minutes, and then water vapor is introduced until the target moisture content of the tobacco leaves is reached.

[0022] Ethanol vapor diffuses rapidly. By first circulating ethanol vapor through two rows of relatively dense tobacco stacks sourced from various locations, and then introducing water vapor for humidification, the process facilitates rapid humidification. Simultaneously, the hydrophilic nature of ethanol vapor acts as a guide during humidification, ensuring that water vapor quickly penetrates deep into the center of each row of tobacco leaves.

[0023] As a preferred method for adding moisture, the tobacco leaves are placed at a height of 20-50 cm.

[0024] As a preferred embodiment of the above-mentioned humidification method, before performing step S2, the pressure inside the vacuum chamber is reduced to below -0.03 MPa to ensure that the air in the tobacco leaves is completely expelled.

[0025] Secondly, based on the above method, the present invention provides an application of a method for moistening tobacco leaves. Its advantage lies in that, taking the moisture content of tobacco leaves before moistening as an example, which is 12-15%, the moisture content of the tobacco leaves after moistening is 25-32%. Using the above method, the moistening time can be less than 40 minutes.

[0026] In existing technologies, commonly used methods such as natural rehumidification or spraying for moisture replenishment cannot quickly increase the moisture content of tobacco leaves from 12-15% to 25-32%. In contrast, this invention can shorten the moisture replenishment time to less than 40 minutes, which has a significant advantage.

[0027] Compared with the prior art, the present invention has the following technical effects:

[0028] The method provided by this invention utilizes a pressure difference to drive the diffusion of humidifying steam into the deeper layers of the tobacco stack, improving the uniformity of rehydration. A heating clamp is used to promote the evaporation of surface moisture from the tobacco leaves, preventing moisture from remaining on the surface and reducing the rate of water vapor diffusion into the stack. Furthermore, the heating clamp promotes the evaporation of surface moisture, generating airflow that diffuses inward, helping moisture quickly penetrate into the deeper layers of the tobacco leaves and improving rehydration efficiency. Humidifying steam is sprayed onto the surface of the tobacco leaves at a pressure of 0.18~0.25 MPa, which promotes moisture penetration and increases the residence time of moisture, ensuring uniform moisture distribution. The steam pressure should not be too high, otherwise the residence time will be too short, making it difficult to wet the tobacco leaves. Additionally, the pressure difference introduces moisture into the deeper layers of the stack, ensuring increased moisture content in these areas. The heating clamp further enhances the overall moisture content and, while maintaining stable pressure, ensures uniform moisture distribution throughout the entire stack, ultimately achieving the target moisture content. Using the method described above, the cigar raw materials that have been allocated can be directly moistened without the need for loosening. After moistening, the toughness of the tobacco leaves is improved, and loosening them after moistening can prevent leaf breakage. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of tobacco leaf placement according to the present invention.

[0030] The diagram is marked as: 1. Chimney stack, 2. Negative pressure vent. Detailed Implementation

[0031] The present invention will be further described below with reference to 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 some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained 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.

[0032] In this embodiment of the invention, the tobacco leaves used for moistening are raw materials that have been transferred back and have not undergone loosening treatment.

[0033] In this embodiment of the invention, the heating clamp has many fine holes, allowing steam to flow between both sides of the heating clamp.

[0034] Example 1

[0035] This embodiment involves moistening tobacco leaves, and the implementation method includes the following steps:

[0036] Step S1: In the vacuum chamber, stack the tobacco leaves to a height of 40 cm and hold the stack with heated clamps, as follows: Figure 1As shown, the smoke stacks 1 are placed in two rows, with a 35 cm gap between the two rows to form a flow guide space. Negative pressure vents 2 are provided between the two rows of smoke stacks and on the outside of the two rows of smoke stacks, which can be used to create a vacuum or negative pressure in the vacuum chamber.

[0037] Step S2: Reduce the pressure inside the vacuum chamber to -0.03 MPa and let it stand for 3 minutes to ensure that the air in the smoke stack is completely expelled. Then adjust the pressure between the two rows of smoke stacks to 0.09 MPa and the pressure on the outside of the smoke stacks to 0.03 MPa, so that the pressure between the two rows of smoke stacks is 0.06 MPa lower than the pressure on the outside of the smoke stacks, forming a pressure difference of 0.06 MPa.

[0038] Step S3: Set the heating temperature of the heating clamp to 48℃ and the temperature of the humidifying steam to 60℃. During humidification, first inject ethanol vapor into the vacuum chamber for 1 minute, then introduce water vapor for 28 minutes. The steam pressure of the humidifying steam is 0.20 MPa, and the steam flow rate is 4000 kg / h.

[0039] Example 2

[0040] This embodiment involves moistening tobacco leaves, and the implementation method includes the following steps:

[0041] Step S1: In the vacuum chamber, stack the tobacco leaves to a height of 40 cm and clamp the stacks with heating clamps. Arrange the stacks in two rows, with a 35 cm gap between the two rows to create a flow guide space. Negative pressure vents are provided between the two rows of stacks and on the outside of the two rows of stacks to create a vacuum or negative pressure in the vacuum chamber.

[0042] Step S2: Reduce the pressure inside the vacuum chamber to -0.03 MPa and let it stand for 3 minutes to ensure that the air in the smoke stack is completely expelled. Then adjust the pressure between the two rows of smoke stacks to 0.09 MPa and the pressure on the outside of the smoke stacks to 0.03 MPa, so that the pressure between the two rows of smoke stacks is 0.06 MPa lower than the pressure on the outside of the smoke stacks, forming a pressure difference of 0.06 MPa.

[0043] Step S3: Set the heating temperature of the heating clamp to 48℃ and the temperature of the humidifying steam to 60℃. During humidification, first inject ethanol vapor into the vacuum chamber for 0.5 minutes, then introduce water vapor for 28 minutes. The steam pressure of the humidifying steam is 0.20 MPa, and the steam flow rate is 4000 kg / h.

[0044] Example 3

[0045] This embodiment involves moistening tobacco leaves, and the implementation method includes the following steps:

[0046] Step S1: In the vacuum chamber, stack the tobacco leaves to a height of 40 cm and clamp the stacks with heating clamps. Arrange the stacks in two rows, with a 35 cm gap between the two rows to create a flow guide space. Negative pressure vents are provided between the two rows of stacks and on the outside of the two rows of stacks to create a vacuum or negative pressure in the vacuum chamber.

[0047] Step S2: Reduce the pressure inside the vacuum chamber to -0.03 MPa and let it stand for 3 minutes to ensure that the air in the smoke stack is completely expelled. Then adjust the pressure between the two rows of smoke stacks to 0.09 MPa and the pressure on the outside of the smoke stacks to 0.03 MPa, so that the pressure between the two rows of smoke stacks is 0.06 MPa lower than the pressure on the outside of the smoke stacks, forming a pressure difference of 0.06 MPa.

[0048] Step S3: Set the heating temperature of the heating clamp to 48℃ and the temperature of the humidifying steam to 60℃. During humidification, first inject ethanol vapor into the vacuum chamber for 2 minutes, then introduce water vapor for 28 minutes. The steam pressure of the humidifying steam is 0.20MPa, and the steam flow rate is 4000kg / h.

[0049] Example 4

[0050] This embodiment involves moistening tobacco leaves, and the implementation method includes the following steps:

[0051] Step S1: In the vacuum chamber, stack the tobacco leaves to a height of 20 cm and clamp the stacks with heating clamps. Arrange the stacks in two rows, with a 30 cm gap between them to form a flow guide space. Negative pressure vents are provided between the two rows of stacks and on the outside of the stacks to create a vacuum or negative pressure in the vacuum chamber.

[0052] Step S2: Reduce the pressure inside the vacuum chamber to -0.03 MPa and let it stand for 3 minutes to ensure that the air in the smoke stack is completely expelled. Then adjust the pressure between the two rows of smoke stacks to 0.15 MPa and the pressure on the outside of the smoke stacks to 0.07 MPa, so that the pressure between the two rows of smoke stacks is 0.08 MPa lower than the pressure on the outside of the smoke stacks, forming a pressure difference of 0.08 MPa.

[0053] Step S3: Set the heating temperature of the heating clamp to 48℃ and the temperature of the humidifying steam to 60℃. During humidification, first inject ethanol vapor into the vacuum chamber for 1 minute, then introduce water vapor for 28 minutes. The steam pressure of the humidifying steam is 0.20 MPa, and the steam flow rate is 4000 kg / h.

[0054] Example 5

[0055] This embodiment involves moistening tobacco leaves, and the implementation method includes the following steps:

[0056] Step S1: In the vacuum chamber, stack the tobacco leaves to a height of 50 cm and clamp the stacks with heating clamps. Arrange the stacks in two rows, with a 45 cm gap between them to create a flow guide space. Negative pressure vents are provided between the two rows of stacks and on the outside of the stacks to create a vacuum or negative pressure in the vacuum chamber.

[0057] Step S2: Reduce the pressure inside the vacuum chamber to -0.03 MPa and let it stand for 4 minutes to ensure that the air in the smoke stack is completely expelled. Then adjust the pressure between the two rows of smoke stacks to 0.12 MPa and the pressure on the outside of the smoke stacks to 0.03 MPa, so that the pressure between the two rows of smoke stacks is 0.09 MPa lower than the pressure on the outside of the smoke stacks, forming a pressure difference of 0.09 MPa.

[0058] Step S3: Set the heating temperature of the heating clamp to 48℃ and the temperature of the humidifying steam to 60℃. During humidification, first inject ethanol vapor into the vacuum chamber for 1 minute, then introduce water vapor for 30 minutes. The steam pressure of the humidifying steam is 0.20 MPa, and the steam flow rate is 4000 kg / h.

[0059] Example 6

[0060] This embodiment involves moistening tobacco leaves, and the implementation method includes the following steps:

[0061] Step S1: In the vacuum chamber, stack the tobacco leaves to a height of 40 cm and clamp the stacks with heating clamps. Arrange the stacks in two rows, with a 35 cm gap between the two rows to create a flow guide space. Negative pressure vents are provided between the two rows of stacks and on the outside of the two rows of stacks to create a vacuum or negative pressure in the vacuum chamber.

[0062] Step S2: Reduce the pressure inside the vacuum chamber to -0.03 MPa and let it stand for 3 minutes to ensure that the air in the smoke stack is completely expelled. Then adjust the pressure between the two rows of smoke stacks to 0.09 MPa and the pressure on the outside of the smoke stacks to 0.03 MPa, so that the pressure between the two rows of smoke stacks is 0.06 MPa lower than the pressure on the outside of the smoke stacks, forming a pressure difference of 0.06 MPa.

[0063] Step S3: Set the heating temperature of the heating clamp to 48℃ and the temperature of the humidifying steam to 60℃. During humidification, first inject ethanol vapor into the vacuum chamber for 1 minute, then introduce water vapor for 35 minutes. The steam pressure of the humidifying steam is 0.20 MPa, and the steam flow rate is 4000 kg / h.

[0064] Comparative Example 1

[0065] The only difference from Example 1 is that the heating clamp is not used for heating. Everything else is the same as in Example 1.

[0066] Comparative Example 2

[0067] Compared with Example 1, the only difference is that in step S2, the pressure between the two rows of smoke stacks is adjusted to 0.03 MPa, and the pressure on the outside of the smoke stacks is also 0.03 MPa, so that no pressure difference is formed between the two rows of smoke stacks and the outside of the smoke stacks. Everything else is the same as in Example 1.

[0068] Comparative Example 3

[0069] The only difference from Example 1 is that the temperature of the humidifying steam is 75°C. Everything else is the same as in Example 1.

[0070] Comparative Example 4

[0071] The only difference from Example 1 is that the temperature of the humidifying steam is 40°C. Everything else is the same as in Example 1.

[0072] Comparative Example 5

[0073] Compared with Example 1, the only difference is that water vapor is introduced for 28 minutes instead of ethanol vapor.

[0074] Comparative Example 6

[0075] Compared with Example 1, the only difference is that water vapor is introduced for 40 minutes instead of ethanol vapor.

[0076] Performance Evaluation

[0077] The moisture content of tobacco leaves in Examples 1-6 and Comparative Examples 1-6 before and after dampening was measured using a microwave moisture meter. The results are shown in Table 1. Before dampening, to avoid damaging the compactness of the tobacco raw materials, the moisture content of the tobacco leaves on the surface of the tobacco stack was measured. After dampening, the moisture content of the tobacco leaves at the center point of one row of tobacco stacks was measured. The average damping rate was calculated as: (moisture content of tobacco leaves before dampening - moisture content of tobacco leaves after dampening) / damping time.

[0078] Table 1

[0079] Moisture content (%) before tidal addition Moisture content (%) after adding moisture High tide time (minutes) Tidal rate (% / min) Example 1 13 29 29 0.55 Example 2 13 25 28.5 0.42 Example 3 14 30 30 0.53 Example 4 13 31 29 0.62 Example 5 12 27 31 0.48 Example 6 13 32 36 0.53 Comparative Example 1 13 19 29 0.21 Comparative Example 2 13 17 29 0.14 Comparative Example 3 14 22 29 0.28 Comparative Example 4 13 19 29 0.21 Comparative Example 5 13 17 28 0.14 Comparative Example 6 13 18 40 0.13

[0080] Data Analysis:

[0081] As shown in Table 1, Examples 1 to 6, the method of the present invention can quickly achieve a moisture content of 25-32% for the returned tobacco leaves without loosening. The reasons for this are as follows: the embodiments of the present invention utilize pressure difference to drive the humidifying steam to diffuse deeper into the tobacco stack, improving the uniformity of rehydration; the heating clamp promotes the evaporation of surface moisture from the tobacco leaves, preventing moisture from remaining on the surface and reducing the rate of water vapor diffusion into the stack; furthermore, the heating clamp promotes the evaporation of surface moisture, generating airflow that diffuses inward, helping moisture to quickly penetrate deeper into the tobacco leaves and improving rehydration efficiency; the humidifying steam sprayed onto the tobacco leaf surface at a pressure of 0.18-0.25 MPa promotes moisture penetration and increases the residence time of moisture, ensuring uniform absorption of moisture by the tobacco leaves, ultimately achieving the target moisture content evenly and stably.

[0082] A comparative analysis of Comparative Example 1 and Example 1 shows that Comparative Example 1, which does not heat the tobacco leaves, has a significantly reduced moisturizing effect, demonstrating the importance of proper heating of tobacco leaves during vacuum moisturizing. The reasons for needing to heat the tobacco leaves, based on the observed phenomena during moisturizing, are as follows: heating promotes the evaporation of surface moisture, preventing moisture from remaining on the surface and reducing the rate of water vapor diffusion into the tobacco stack; furthermore, heating with the heating clamps promotes the evaporation of surface moisture, generating airflow that diffuses inward, helping moisture quickly penetrate deeper into the tobacco leaves and improving rehumidification efficiency; without heating, excessive moisture remains on the surface of the tobacco stack when water vapor comes into contact with it, affecting subsequent moisture penetration into the deeper layers of the stack and hindering the moisturizing of deeper tobacco leaves.

[0083] The comparative analysis between Comparative Example 2 and Example 1 shows that without setting a pressure difference, the humidification effect of Comparative Example 1 is greatly reduced. This demonstrates the importance of pressure difference as a driving force in promoting the penetration of water vapor into the deep layers of the smokestack.

[0084] Comparative analysis of Comparative Examples 3 and 4 with Example 1 shows that the steam temperatures of Comparative Examples 3 and 4 were 75℃ and 40℃, respectively. The moisture content of the tobacco leaves after humidification in Comparative Examples 3 and 4 was significantly reduced, indicating that the steam used for humidification, within a certain range, can increase the humidification rate. However, during implementation, it was found that at a steam temperature of 75℃, some areas of the heated clamp area exhibited a darker color, resulting in a decrease in appearance quality.

[0085] Comparative analysis of Comparative Examples 5 and 6 with Example 1 shows that even with extended humidification time (40 minutes as in Comparative Example 6) without the introduction of ethanol, the final moisture content of the tobacco leaves in Comparative Examples 5 and 6 did not increase. This demonstrates the advantage of introducing ethanol vapor in increasing the humidification rate. The reason for this may be that ethanol vapor diffuses quickly in the tobacco leaves. Utilizing ethanol vapor to first circulate through two rows of relatively dense tobacco stacks transferred from various locations, followed by the introduction of water vapor for humidification, facilitates rapid humidification. Simultaneously, ethanol vapor is hydrophilic, acting as a guide during humidification. This dual effect of circulation and guidance ensures that water vapor quickly penetrates deep into the center of the tobacco stack.

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

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for moistening cigar tobacco leaves, characterized in that: Includes the following steps: Step S1: In the vacuum chamber, use heating clamps to hold the tobacco leaves and place them in two rows, with a spacing of 30-45 cm between the two rows to form a flow guide space; Step S2: Adjust the pressure between the two rows of tobacco leaves to be lower than the pressure on the outer side of the tobacco leaves, thus creating a pressure difference; Step S3: Inject humidifying steam into the vacuum chamber to humidify the tobacco leaves. The pressure of the humidifying steam is 0.18~0.25MPa. in: In step S1, the heating temperature of the heating clamp is 45℃~50℃, and the height of the tobacco leaves is 20~50 cm. In step S3, when adding moisture, first introduce ethanol vapor for 0.5 to 2 minutes, and then introduce water vapor until the target moisture content of the tobacco leaves is reached.

2. The method for moistening cigar tobacco leaves as described in claim 1, characterized in that: In step S3, the temperature of the added moisture steam is 50℃~65℃.

3. The method for moistening cigar tobacco leaves as described in claim 1, characterized in that: In step S2, the pressure difference is above 0.03 MPa.

4. The method for moistening cigar tobacco leaves as described in claim 3, characterized in that: The pressure between the two rows of tobacco leaves is 0.09~0.15MPa, and the pressure on the outside of the tobacco leaves is 0.03~0.07MPa.

5. A method for moistening cigar tobacco leaves as described in claim 1, characterized in that: Before proceeding to step S2, the pressure inside the vacuum chamber is reduced to below -0.03 MPa to ensure that the air in the tobacco leaves is completely expelled.

6. The application of the humidification method according to any one of claims 1 to 5 in the humidification of tobacco leaves, characterized in that: The moisture content of the tobacco leaves before moistening is 12-15%, and the moisture content of the tobacco leaves after moistening is 25-32%, with the moistening time being less than 40 minutes.

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