A method for treating the lower part of a cigar tobacco leaf to reduce the rate of green leaf and the rate of mold

Abstract

The present application relates to a kind of methods for processing lower tobacco leaves of cigar, which can reduce the rate of green and mildew, and the steps include: fresh cigar tobacco leaves are hung on a rack for airing after being threaded into a string by needle, and the airing period includes pre-yellowing period, wilting period, post-yellowing period, pre-browning period, post-browning period, color fixing period and dry muscle period. The relative humidity and temperature in the airing room are controlled during each airing period, and after 15-20 days of airing, the moisture content of the tobacco leaves is naturally restored to 18-23%, and the initial fermentation of the stacked leaves is carried out for 2-3 times. The method for airing cigar tobacco leaves of the present application can significantly reduce the output rate of green, colored and mildew tobacco leaves during the airing process of lower cigar tobacco leaves, and the airing time is 7-10 days earlier than ordinary airing, and the color of the aired tobacco leaves is uniform, which can effectively improve the airing quality of lower cigar tobacco leaves.

Description

Technical Field

[0001] This invention relates to the field of tobacco leaf drying technology, and in particular to a method for drying lower tobacco leaves of cigars that can reduce the rate of green impurities and mold. Background Technology

[0002] The curing of cigar tobacco involves placing field-grown tobacco leaves that have reached a certain maturity level in specialized curing facilities. By carefully controlling the temperature and humidity within these facilities, the internal composition and appearance of the tobacco leaves undergo systematic changes to achieve the desired appearance, physical, internal, and smoking qualities. Cigar tobacco raw materials are categorized by their intended use into wrapper, binder, and filler leaves, with binder and filler leaves generally referred to collectively as filler leaves. Different curing techniques are typically employed for tobacco leaves intended for different purposes due to varying quality requirements. Regardless of the intended use, when using a fixed curing technique, different parts of the tobacco leaf exhibit significantly different curing characteristics. This is primarily manifested in the lower leaves being more difficult to cure, resulting in a higher rate of green impurities and mold.

[0003] Current research on cigar tobacco preparation methods, both domestically and internationally, mainly focuses on the type of cigar tobacco leaves used for classification, rather than the part of the leaf. Furthermore, existing drying techniques only specify the temperature and humidity ranges for different stages, without defining specific methods for controlling the moisture content of the tobacco leaves at particular stages. This results in a higher rate of green impurities and mold in the lower leaves when using existing cigar tobacco preparation techniques for drying.

[0004] Therefore, there is an urgent need to develop a method for processing the lower tobacco leaves of cigars that can reduce the rate of green impurities and mold, in order to meet production needs. Summary of the Invention

[0005] The purpose of this invention is to provide a method for drying lower tobacco leaves in cigars that can reduce the rate of green impurities.

[0006] The present invention is implemented using the following technical solution.

[0007] A method for treating lower tobacco leaves of cigars to reduce the rate of green impurities and mold, the method comprising a drying process, the steps of which are as follows:

[0008] Step 1) Place two fresh tobacco leaves back to back and thread them horizontally through the main vein 1-2 cm from the end of the leaf petiole to form a string. Hang each string alternately on a 2-meter-long metal tobacco rod and hang it on the drying rack in the drying room for drying.

[0009] Step 2) The drying process is set into seven stages: early yellowing stage, withering stage, late yellowing stage, early browning stage, late browning stage, color setting stage, and rib drying stage;

[0010] The temperature during the early stage of yellowing is 22-27℃, the humidity is 95%-99%, and it lasts for 2-3 days.

[0011] The temperature during the wilting period is 22-27℃, the humidity is 85%-95%, and the duration is 1 day.

[0012] The temperature during the later stage of yellowing was 22-27℃, the humidity was 85%-95%, and the duration was 1 day.

[0013] The temperature during the early stage of browning is 27-32℃, the humidity is 80%-85%, and it takes 2-3 days.

[0014] The temperature during the later stage of browning is 27-32℃, the humidity is 75%-80%, and the time is 1-2 days.

[0015] The color-fixing period is characterized by a temperature of 32-35℃, a humidity of 65%-75%, and a duration of 2-3 days.

[0016] The drying period is characterized by a temperature of 35-40℃ and a humidity of 45%-60%, lasting 5-7 days.

[0017] The total drying time is set to 14-20 days.

[0018] Furthermore, the processing method of the present invention also includes an initial fermentation process, the steps of which are as follows:

[0019] Step 3) After the dried tobacco leaves have been rehydrated to a moisture content of 18%-23%, they are piled up with the tobacco stalks attached. The tobacco leaves are piled on a plastic film-lined pallet, with the pallet 10-20cm high. Two tobacco stalks are piled up tip to tip, with a pile height of 1-1.2 meters. The surface of the tobacco leaves is covered with burlap. During the piling process, the temperature inside the pile is monitored. When it reaches 36-39℃, the pile is turned over, with the upper layer of tobacco leaves turned to the lower layer and the outer layer of tobacco leaves turned to the inner layer. The pile is turned over 2-3 times in a row before being removed from the stalks, graded, and packaged.

[0020] Furthermore, in step 1) of the present invention, each tobacco stick has 55-65 tobacco leaves, and the distance between tobacco sticks is 25-30cm.

[0021] Furthermore, in step 1) of the present invention, the drying rack is arranged in 7 layers along the vertical direction, with a spacing of 70cm between each layer, the lower layer being 150cm from the ground, and the upper layer being at least 50cm from the roof.

[0022] Furthermore, in step 1) of the present invention, the cigar tobacco leaves are dried on the 1st to 3rd layer for 4 to 5 days, then moved to the 4th to 5th layer for 3 to 5 days, then moved to the 6th to 7th layer for 2 to 3 days, and finally moved to the drying room for 5 to 7 days.

[0023] Furthermore, in step 2) of the present invention, the humidity control method for controlling the withering period from 9:00 AM to 5:00 PM is to alternate between 85% and 95%; after closing the doors and windows until the humidity in the drying room reaches 95%, open the doors and windows to reduce the humidity to 85%, and then close the doors and windows to start the next cycle; during other periods, the humidity in the drying room can be kept within the range of 85% to 95%.

[0024] Furthermore, in step 2) of the present invention, the humidity control method for the later stage of browning control from 9:00 am to 5:00 pm is to alternate within the range of 75%-80%; after closing the doors and windows until the humidity in the drying room reaches 80%, open the doors and windows to reduce the humidity to 75%, and then close the doors and windows to start the next cycle; during other periods, the humidity in the drying room can be kept within the range of 75%-80%.

[0025] Furthermore, in step 2) of the present invention, the tobacco leaves in the drying stage need to be transferred to a drying room without un-colored tobacco leaves, and the spacing between the tobacco stalks in the drying stage is 12-15cm.

[0026] Furthermore, in step 3) of the present invention, the rehydration method is the natural rehydration method, in which the dried tobacco leaves are hung on the bottom floor of the drying room in the evening, and the doors and windows are opened until the next morning, allowing the tobacco leaves to naturally rehydrate to a moisture content of 18%-23%.

[0027] Furthermore, the lower tobacco leaf of the cigar described in this invention is the lower tobacco leaf of a cigar wrapper variety or a cigar filler variety.

[0028] The beneficial effects of this invention are that the method can significantly improve the drying quality of the lower cigar tobacco leaves, significantly reduce the rate of green impurities and mold after drying, make the tobacco leaves uniform in color (see attached figure), have moderate thickness and good elasticity, and shorten the drying time by 7-10 days compared with conventional drying methods.

[0029] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0030] Figure 1 Photographs of tobacco leaves during the withering stage when using this invention.

[0031] Figure 2 Photographs of tobacco leaves turning yellow during the drying process using this invention.

[0032] Figure 3 Photograph 1 of the dried tobacco leaves after using the present invention.

[0033] Figure 4 Photo 2 shows the dried tobacco leaves after using the present invention.

[0034] Figure 5Photograph 1 shows the dried tomato core leaves after using the present invention.

[0035] Figure 6 Photo 2 shows the dried tomato core leaves after using this invention. Detailed Implementation

[0036] The following embodiments are only a part of the technical solutions of the present invention and are not intended to limit all the technical solutions of the present invention. The embodiments of the present invention are provided to further explain and illustrate the details of the technical solutions of the present invention.

[0037] A method for treating lower tobacco leaves of cigars to reduce the rate of green impurities and mold, the method comprising a drying process, the steps of which are as follows:

[0038] Step 1) Place two fresh tobacco leaves back to back and thread them horizontally through the main vein 1-2 cm from the end of the leaf petiole to form a string. Hang each string alternately on a 2-meter-long metal tobacco rod and hang it on the drying rack in the drying room for drying.

[0039] Step 2) The drying process is set into seven stages: early yellowing stage, withering stage, late yellowing stage, early browning stage, late browning stage, color setting stage, and rib drying stage;

[0040] The temperature during the early stage of yellowing is 22-27℃, the humidity is 95%-99%, and it lasts for 2-3 days.

[0041] The temperature during the wilting period is 22-27℃, the humidity is 85%-95%, and the duration is 1 day.

[0042] The temperature during the later stage of yellowing was 22-27℃, the humidity was 85%-95%, and the duration was 1 day.

[0043] The temperature during the early stage of browning is 27-32℃, the humidity is 80%-85%, and it takes 2-3 days.

[0044] The temperature during the later stage of browning is 27-32℃, the humidity is 75%-80%, and the time is 1-2 days.

[0045] The color-fixing period is characterized by a temperature of 32-35℃, a humidity of 65%-75%, and a duration of 2-3 days.

[0046] The drying period is characterized by a temperature of 35-40℃ and a humidity of 45%-60%, lasting 5-7 days.

[0047] The total drying time is set to 14-20 days.

[0048] Furthermore, the processing method of the present invention also includes an initial fermentation process, the steps of which are as follows:

[0049] Step 3) After the dried tobacco leaves have been rehydrated to a moisture content of 18%-23%, they are piled up with the tobacco stalks attached. The tobacco leaves are piled on a plastic film-lined pallet, with the pallet 10-20cm high. Two tobacco stalks are piled up tip to tip, with a pile height of 1-1.2 meters. The surface of the tobacco leaves is covered with burlap. During the piling process, the temperature inside the pile is monitored. When it reaches 36-39℃, the pile is turned over, with the upper layer of tobacco leaves turned to the lower layer and the outer layer of tobacco leaves turned to the inner layer. The pile is turned over 2-3 times in a row before being removed from the stalks, graded, and packaged.

[0050] Furthermore, in step 1) of the present invention, each tobacco stick has 55-65 tobacco leaves, and the distance between tobacco sticks is 25-30cm.

[0051] Furthermore, in step 1) of the present invention, the drying rack is arranged in 7 layers along the vertical direction, with a spacing of 70cm between each layer, the lower layer being 150cm from the ground, and the upper layer being at least 50cm from the roof.

[0052] Furthermore, in step 1) of the present invention, the cigar tobacco leaves are dried on the 1st to 3rd layer for 4 to 5 days, then moved to the 4th to 5th layer for 3 to 5 days, then moved to the 6th to 7th layer for 2 to 3 days, and finally moved to the drying room for 5 to 7 days.

[0053] Furthermore, in step 2) of the present invention, the humidity control method for controlling the withering period from 9:00 AM to 5:00 PM is to alternate between 85% and 95%; after closing the doors and windows until the humidity in the drying room reaches 95%, open the doors and windows to reduce the humidity to 85%, and then close the doors and windows to start the next cycle; during other periods, the humidity in the drying room can be kept within the range of 85% to 95%.

[0054] Furthermore, in step 2) of the present invention, the humidity control method for the later stage of browning control from 9:00 am to 5:00 pm is to alternate within the range of 75%-80%; after closing the doors and windows until the humidity in the drying room reaches 80%, open the doors and windows to reduce the humidity to 75%, and then close the doors and windows to start the next cycle; during other periods, the humidity in the drying room can be kept within the range of 75%-80%.

[0055] Furthermore, in step 2) of the present invention, the tobacco leaves in the drying stage need to be transferred to a drying room without un-colored tobacco leaves, and the spacing between the tobacco stalks in the drying stage is 12-15cm.

[0056] Furthermore, in step 3) of the present invention, the rehydration method is the natural rehydration method, in which the dried tobacco leaves are hung on the bottom floor of the drying room in the evening, and the doors and windows are opened until the next morning, allowing the tobacco leaves to naturally rehydrate to a moisture content of 18%-23%.

[0057] Furthermore, the lower tobacco leaf of the cigar described in this invention is the lower tobacco leaf of a cigar wrapper variety or a cigar filler variety.

[0058] The beneficial effects of this invention are that the method can significantly improve the drying quality of the lower cigar tobacco leaves, significantly reduce the rate of green impurities and mold after drying, make the tobacco leaves uniform in color, have moderate thickness and good elasticity, and shorten the drying time by 7-10 days compared with conventional drying methods.

[0059] Example 1:

[0060] 1. Drying process

[0061] After the lower leaves of the Yunxue 39 variety of eggplant core planted in Dujia Village, Huaxi Town, Huaning County, Yuxi City were harvested at the appropriate maturity in 2023, the fresh tobacco leaves were strung together in groups of two, back to back, with cotton thread threaded horizontally through the main vein 1-2 cm from the petiole end. Each group was hung alternately on a 2-meter-long metal tobacco stem, with 55 leaves per stem and a spacing of 25 cm between each stem. The temperature and humidity in the drying room are controlled as follows for each stage of the drying process: Early yellowing stage: 23-26℃, humidity 95%-99%; Wilting stage: 23-26℃, humidity 85%-95% (during the day, from 9:00 AM to 5:00 PM, the humidity in the drying room is fluctuated between 85% and 95% by opening and closing doors and windows); Late yellowing stage: 23-26℃, humidity 85%-90%; Early browning stage: 28-30℃, humidity 82%-85%; Late browning stage: 28-30℃, humidity 75%-80% (during the day, from 9:00 AM to 5:00 PM, the humidity in the drying room is fluctuated between 75% and 80% by opening and closing doors and windows); Color fixing stage: 32-34℃, humidity 68%-73%; Drying stage: 36-39℃, humidity 47%-55% (during this stage, the drying room is moved to a separate drying room without other tobacco leaves). After 18 days of drying, the tobacco leaves naturally rehydrate to a moisture content of 18%-23%.

[0062] 2. Initial fermentation process

[0063] After the tobacco leaves have been rehydrated, they are piled up with the stems. The tobacco leaves are placed on a plastic film-lined pallet, with the pallet 10-20cm high. Two tobacco leaves are piled up tip to tip, with a pile height of 1-1.2 meters. The surface of the tobacco leaves is covered with burlap. During the piling process, the temperature inside the pile is monitored. When it reaches 38℃, the pile is turned over, with the upper layer of tobacco leaves turned to the lower layer and the outer layer of tobacco leaves turned to the inner layer. After turning the pile 2-3 times, the stems are removed and the tobacco is initially graded.

[0064] Example 2:

[0065] 1. Drying process

[0066] After the lower leaves of the Yunxue 38 variety of tobacco planted in Dujia Village, Huaxi Town, Huaning County, Yuxi City, are harvested at the appropriate maturity in 2023, two fresh tobacco leaves are strung together back to back with cotton thread, passing horizontally through the main vein 1-2 cm from the petiole end. Each group is then hung alternately on a 2-meter-long metal tobacco stem, with 60 leaves per stem and a spacing of 30 cm between each stem. The temperature and humidity in the drying room are controlled as follows for each stage of the drying process: Early yellowing stage: 22-25℃, humidity 95%-98%; Wilting stage: 22-25℃, humidity 85%-95% (during the day, from 9:00 AM to 5:00 PM, the humidity in the drying room is fluctuated between 85% and 95% by opening and closing doors and windows); Late yellowing stage: 22-25℃, humidity 88%-92%; Early browning stage: 27-30℃, humidity 82%-85%; Late browning stage: 27-31℃, humidity 75%-80% (during the day, from 9:00 AM to 5:00 PM, the humidity in the drying room is fluctuated between 75% and 80% by opening and closing doors and windows); Color fixing stage: 32-34℃, humidity 70%-75%; Drying stage: 35-38℃, humidity 45%-55% (during this stage, the drying room is moved to a separate drying room without other tobacco leaves). After 16 days of drying, the tobacco leaves naturally rehydrate to a moisture content of 18%-23%.

[0067] 2. Initial fermentation process

[0068] After the tobacco leaves have been rehydrated, they are piled up with the stems. The tobacco leaves are placed on a plastic film-lined pallet, with the pallet 10-20cm high. Two tobacco leaves are piled up tip to tip, with a pile height of 1-1.2 meters. The surface of the tobacco leaves is covered with burlap. During the piling process, the temperature inside the pile is monitored. When it reaches 36℃, the pile is turned over, with the upper layer of tobacco leaves turned to the lower layer and the outer layer of tobacco leaves turned to the inner layer. After turning the pile 2-3 times, the stems are removed and the tobacco is initially graded.

[0069] The green impurity rate and mold rate of the air-dried cigar tobacco leaves in Examples 1-2 were compared with those of conventionally air-dried cigar tobacco leaves. The comparison results are shown in Table 1.

[0070] Table 1 Comparison of the quality of cigar tobacco leaves after drying using the method of the present invention and the traditional drying method.

[0071] Drying time 21 days 25 days 18 days 16 days Green tobacco leaf ratio 35％ 22％ 12％ 14％ Proportion of variegated tobacco leaves 18％ 15％ 4％ 7％ Proportion of moldy tobacco leaves 12％ 11％ 3％ 5％

[0072] The conventional drying method described in this invention has the following steps:

[0073] The cigar tobacco drying process is divided into four stages: yellowing stage, browning stage, dry leaf stage, and dry core stage.

[0074]

[0075] (1) Yellowing stage: Duration: 5-7 days, Temperature requirement: 25-30℃, Humidity requirement: 90-80%. The tobacco leaves change color from green at the leaf edges to yellow, with yellow leaves and green veins; the tobacco leaves lose water, wilt, and collapse. Open doors and windows during the day and close them at night. When the humidity is greater than 90%, ventilate to remove moisture, allowing the tobacco leaves to gradually lose water and turn yellow. This period is the most critical stage affecting the quality of cigar tobacco leaves. The temperature and humidity should be raised and lowered slowly, so that the temperature in the drying room slowly rises from above 25℃ to about 30℃, and the relative humidity slowly drops from 90% to about 80%. If the initial temperature of the drying room is lower than 25℃ after loading the tobacco, use heating equipment to raise the temperature of the drying room to 25℃ within 24 hours, and then maintain a slow temperature increase and humidity decrease during the drying process.

[0076] (2) Browning stage: Duration: 6-8 days; Temperature requirement: 27-32℃; Humidity requirement: 80-75%. The main veins of the tobacco leaves soften, and oxidation causes the leaf color to change from yellow to brownish-yellow. At this time, the tobacco leaves are greatly affected by water evaporation. When the humidity is high, increase ventilation; when the humidity is low, close doors and windows or sprinkle water to increase humidity. When evaporation is slow, the brown color will deepen; when evaporation is fast, the color will lighten, and sometimes it may even turn yellow. The relative humidity in the drying room should be kept to decrease slowly so that the color of the tobacco leaves can change fully and turn brown.

[0077] (3) Leaf drying period: Duration: 12-15 days, Temperature requirement: 30-35℃, Humidity requirement: 75-50%. Leaf color changes from brownish-yellow to brownish-brown, and the main vein changes from yellow to brown. This is the leaf drying process. During this stage, auxiliary heating is needed daily to make the temperature rise more slowly and the humidity decrease more slowly. The temperature slowly rises from 30℃ to 35℃, and the relative humidity slowly decreases from 80-75% to 50%, so that the leaves and veins dry, and the main vein is 70% dry.

[0078] (4) Drying Period: Duration: 12-15 days, Temperature: 35-40℃, Humidity: 50-35%. The leaves are completely dry, the main veins are completely dry, and the leaves are entirely brown. Maintain a continuous increase in temperature and a continuous decrease in relative humidity in the drying room to complete the drying process and prevent prolonged ventilation from causing the tobacco leaves to lighten in color. The temperature should not drop too much at night (to avoid moisture seeping down the main veins or back into the lateral veins). Maintain a stable temperature until a crisp cracking sound can be heard when a tobacco leaf is folded in half, indicating that the tobacco veins are dry and the drying process is complete. Temperature, humidity, and ventilation play a decisive role in the quality of cigar tobacco leaves during the drying process. The drying speed must be controlled to avoid drying too quickly, which may leave the leaves with a green or uneven color; the drying period should not be prolonged to avoid the color becoming too dark and the structure too loose; the drying temperature should be controlled, as too high a temperature will damage the quality of the tobacco leaves, especially the bottom leaves, which are prone to blackening, while too low a temperature will cause mold and disease spots. Maintain adequate ventilation by adjusting the density of smoke, opening and closing doors and windows, and even using forced ventilation. However, during the drying period, ventilation equipment should usually be turned off at night, and heating should be continued to prevent temperature drops.

[0079] After drying, open windows for ventilation to regulate the humidity of the tobacco leaves. This process takes 2-3 days, allowing the leaves to regain moisture to meet the required humidity levels for the outer leaves (around 25% for the outer layer and around 20% for the inner layer). The leaves should spring back slightly when gently pressed after regaining moisture, but not break. If a cracking sound is heard when pressed, the leaves are not sufficiently moistened.

[0080] The above descriptions are merely some specific embodiments of the present invention (since the present invention encompasses numerical ranges, the embodiments cannot be exhaustive; the scope of protection described in the present invention includes the numerical range and other technical aspects of the present invention). Specific content or common knowledge known in the solutions is not described in detail here (including but not limited to abbreviations, acronyms, and units conventionally used in the art). It should be noted that the above embodiments do not limit the present invention in any way. For those skilled in the art, all technical solutions obtained by equivalent substitution or equivalent transformation fall within the scope of protection of the present invention. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for treating the lower tobacco leaves of cigars to reduce the rate of green impurities and mold, characterized in that, The processing method includes an air-drying process, the steps of which are as follows: Step 1) Place two fresh tobacco leaves back-to-back and thread them horizontally along the main vein 1-2 cm from the petiole end to form a string. Hang each string alternately on a 2-meter-long tobacco stem and then on a drying rack in the drying room. Step 2) The drying process is divided into seven stages: early yellowing, wilting, late yellowing, early browning, late browning, color fixing, and rib drying. The early yellowing stage is at 22-27℃ with 95%-99% humidity for 2-3 days; the wilting stage is at 22-27℃ with 85%-95% humidity for 1 day; the late yellowing stage is at 22-27℃ with 85%-95% humidity for 1 day; the early browning stage is at 27-32℃ with 80%-85% humidity for 2-3 days; and the late browning stage is at 27-32℃ with 75%-80% humidity for 1-2 days. The temperature for the color-fixing period is 32-35℃, and the humidity is 65%-75%, lasting 2-3 days; the temperature for the drying period is 35-40℃, and the humidity is 45%-60%, lasting 5-7 days; the total drying time is set to 14-20 days. Step 3) After the dried tobacco leaves are rehydrated to a moisture content of 18%-23%, they are piled up with the tobacco stems attached. The tobacco leaves are piled on a plastic film-covered pallet, with the pallet height being 10-20cm. Two tobacco stems are piled up tip to tip, with a pile height of 1-1.The tobacco leaves are stacked to a height of 2 meters. The surface of the tobacco leaves is covered with burlap. During the stacking process, the temperature inside the pile is monitored and turned when it reaches 36-39℃. The top layer of tobacco leaves is turned to the bottom layer, and the outer layer to the inner layer. This turning is repeated 2-3 times before the leaves are removed from the racks, graded, and packaged. In step 1), the drying racks are arranged vertically in 7 layers, with each layer spaced 70cm apart. The bottom layer is 150cm from the ground, and the top layer is at least 50cm from the roof. In step 1), the tobacco leaves are dried on layers 1-3 for 4-5 days, then moved to layers 4-5 for 3-5 days, then to layers 6-7 for 2-3 days, and finally transferred to a drying room for 5-7 days. In step 2), the humidity during the withering period, from 9:00 AM to 5:00 PM, is controlled at 85%-95%. The process is repeated within a certain range; after closing doors and windows until the humidity in the drying room reaches 95%, open the doors and windows to reduce the humidity to 85%, then close the doors and windows again to start the next cycle; during other times, maintain the humidity in the drying room within the range of 85%-95%. The humidity control method for the later browning stage, from 9:00 AM to 5:00 PM, involves alternating between the 75%-80% range; after closing doors and windows until the humidity in the drying room reaches 80%, open the doors and windows to reduce the humidity to 75%, then close the doors and windows again to start the next cycle; during other times, maintain the humidity in the drying room within the range of 75%-80%. In step 2), tobacco leaves in the drying stage need to be transferred to a drying room without un-colored tobacco leaves. The spacing between tobacco stalks during the drying stage is 12-15cm.

2. The method for treating lower tobacco leaves of cigars to reduce the rate of green impurities and mold, as described in claim 1, is characterized in that... In step 1), each tobacco stick has 55-65 tobacco leaves, and the distance between tobacco sticks is 25-30cm.

3. The method for treating lower tobacco leaves of cigars to reduce the rate of green impurities and mold, as described in claim 1, is characterized in that... In step 3), the rehydration method is natural rehydration. The dried tobacco leaves are hung on the bottom floor of the drying room in the evening, and the doors and windows are opened until the next morning, allowing the tobacco leaves to naturally rehydrate to a moisture content of 18%-23%.

4. A method for treating the lower tobacco leaves of cigars to reduce the rate of green impurities and mold, as described in claim 1, wherein the lower tobacco leaves of the cigars are the lower tobacco leaves of the wrapper variety or the filler variety of the cigars.

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