Cigar tobacco air-curing process

Abstract

The invention relates to the technical field of tobacco processing, in particular to a cigar tobacco air-curing process. Aiming at the characteristics of weak illumination intensity, thin and tender tobacco leaves and high water content in a southeast tobacco area, the air-curing process of the harvested cigar tobacco leaves is improved, different air-curing processes are respectively set for lower leaves, middle leaves and upper leaves, eight stages are set according to the substantial change process of air-curing of the leaves, and the air-curing process of the cigar tobacco leaves is improved. A yellowing stage, a browning stage, a color fixing stage and a stem drying stage are divided in a front stage and a rear stage through surface shape changes, each stage is set according to the fact that the temperature is increased by 1 DEG C, humidity is strictly controlled to be regularly and slowly reduced, the cigar tobacco leaves can adapt to the constantly-changing airing environment, the mildew and rot problem is solved, the airing process of the cigar tobacco leaves is effectively slowed down, the airing time of each stage is prolonged, and the cigar tobacco leaf airing quality is improved. Slow conversion of tobacco substances during airing is effectively promoted, natural airing of cigar tobacco leaves is kept to the maximum extent, uniformity and oil content of the aired tobacco leaves are guaranteed, and the cigar flavor is kept.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco processing, in particular to a cigar tobacco leaf airing process. Background Art

[0002] A Chinese patent with authorization announcement number CN115104750B discloses a method for harvesting and drying cigars suitable for areas with dry climates; in the method, only the middle and upper tobacco leaves are used for drying. The method involved in the above patent scheme is not suitable for the subtropical monsoon climate of the southeastern tobacco area.

[0003] The subtropical monsoon climate in the southeastern tobacco area has the following characteristics: the average annual temperature in the planting area is generally between 16.5-19.3℃, the average temperature in the hottest month is 27-29℃, and the average annual rainfall is mostly between 1500-1900mm. The rainy season is from March to June all year round, with a rainfall of about 550-1100mm, accounting for 50-60% of the annual rainfall; the average rainfall from July to September is about 350-750mm, accounting for 20-40% of the annual rainfall. The rainfall during this period is mainly closely related to typhoon activity.

[0004] Due to the cultivation characteristics of cigar tobacco leaves in the southeastern tobacco area, cigar tobacco leaves have a high water content, but the leaves lose water easily and are difficult to keep moist during air-drying, which makes it difficult for the air-drying tobacco leaves to achieve a high smoking score. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to provide a cigar tobacco leaf air-drying process suitable for the cultivation characteristics under the climate of the southeastern tobacco region according to the climate characteristics of the southeastern tobacco region.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] Cigar tobacco leaf drying process, according to the tobacco leaf drying stage, when the tobacco leaf drying enters the next change stage each time, the temperature is increased by 1°C, and the relative humidity is dehumidified at a rate of 0.4-2% per day;

[0008] The drying stage includes:

[0009] The first stage: from the wilting stage to the early stage of yellowing. The end of the stage is characterized by the leaves becoming soft and wilting, the green color of the tobacco leaves fading, and turning yellow 4-6 layers. The relative humidity is controlled at 90-95%;

[0010] The second stage: the late yellowing stage, the end of the stage is that the leaves turn yellow 9-10 layers, and turn brown synchronously, and the relative humidity is controlled at 85-90%;

[0011] The third stage: the early stage of browning. The end of the stage is that the tobacco leaves turn dark brown, turn 8-9 layers brown, the veins begin to turn brown, and the relative humidity is controlled at 82-85%;

[0012] The fourth stage: the late stage of browning, the end of the stage is that the tobacco leaves and veins are completely brown, and the relative humidity is controlled at 80-82%;

[0013] The fifth stage: the early stage of color fixation. The end of the stage is that the tobacco leaves are fixed in color, the leaves are completely dry, the veins are about 1 / 3 dry, and the relative humidity is controlled at 78-80%;

[0014] Stage 6: Late color fixation, the end of the stage is when the leaves and veins are completely dry, and the relative humidity is controlled at 75-78%;

[0015] The seventh stage: the early stage of rib drying, the end of the stage is that the leaves and veins are basically dry, the ribs turn dark brown and shrink, and the relative humidity is controlled at 70-75%;

[0016] The eighth stage: the late stage of drying ribs. The end of the stage is characterized by the smoke ribs becoming concave, black, completely dry, and easy to break. The relative humidity is controlled at <70%.

[0017] Furthermore, in the above-mentioned cigar tobacco leaf air-drying process, the temperature difference of the lower leaves, middle leaves and upper leaves of the cigar tobacco leaves at the same stage increases by 1-2°C.

[0018] Furthermore, in the above cigar tobacco leaf air-drying process, the temperature of the lower leaves of the cigar tobacco leaves in the first stage is 23-25°C.

[0019] Furthermore, in the above cigar tobacco leaf air-drying process, the temperature of the middle leaves of the cigar tobacco leaves in the first stage is 24-26°C.

[0020] Furthermore, in the above cigar tobacco leaf air-drying process, the temperature of the middle leaves of the cigar tobacco leaves in the first stage is 25-27°C.

[0021] Furthermore, in the above-mentioned cigar tobacco leaf air-drying process, the air-drying time of the lower leaves of the cigar tobacco in the first stage is 3-5 days, the air-drying time of the second stage is 3-5 days, the air-drying time of the third stage is 4-6 days, the air-drying time of the fourth stage is 4-6 days, the air-drying time of the fifth stage is 2-4 days, the air-drying time of the sixth stage is 2-4 days, the air-drying time of the seventh stage is 5-7 days, and the air-drying time of the eighth stage is 5-7 days. The air-drying time of the middle leaves of the cigar tobacco in each stage is increased by 1 day compared with the lower leaves, and the air-drying time of the upper leaves of the cigar tobacco in each stage is increased by 1 day compared with the middle leaves.

[0022] The beneficial effects of the present invention are as follows: the present invention improves the drying process of harvested cigar tobacco leaves in view of the characteristics of weak light intensity, thin and tender tobacco leaves and high water content in the southeast tobacco area, and sets different drying processes for lower leaves, middle leaves and upper leaves respectively, wherein eight stages are set according to the substantial change process of leaf drying, and the yellowing, browning, color fixing and dry tendon stages are divided into early and late stages by surface changes respectively, and each stage is set according to a temperature increase of 1°C, and the humidity is strictly controlled to decrease slowly and regularly, so that the cigar tobacco leaves can adapt to the constantly changing drying environment, reduce the problem of mildew, effectively slow down the drying process of the cigar tobacco leaves, extend the drying time of each stage, effectively promote the slow conversion of tobacco leaf substances during drying, maintain the natural air drying of the cigar tobacco leaves to the maximum extent, ensure the uniformity and oil content of the tobacco leaves after drying, and maintain the cigar flavor. DETAILED DESCRIPTION

[0023] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes.

[0024] The specific embodiment of the present invention relates to a cigar tobacco leaf airing process. According to the airing stage of the tobacco leaf, when the tobacco leaf airing enters the next change stage each time, the temperature is correspondingly increased by 1°C, and the relative humidity is dehumidified at a rate of 0.4-2% per day;

[0025] The drying stage includes:

[0026] The first stage: from the wilting stage to the early stage of yellowing. The end of the stage is characterized by the leaves becoming soft and wilting, the green color of the tobacco leaves fading, and turning yellow 4-6 layers. The relative humidity is controlled at 90-95%;

[0027] The second stage: the late yellowing stage, the end of the stage is that the leaves turn yellow 9-10 layers, and turn brown synchronously, and the relative humidity is controlled at 85-90%;

[0028] The third stage: the early stage of browning. The end of the stage is that the tobacco leaves turn dark brown, turn 8-9 layers brown, the veins begin to turn brown, and the relative humidity is controlled at 82-85%;

[0029] The fourth stage: the late stage of browning, the end of the stage is that the tobacco leaves and veins are completely brown, and the relative humidity is controlled at 80-82%;

[0030] The fifth stage: the early stage of color fixation. The end of the stage is that the tobacco leaves are fixed in color, the leaves are completely dry, the veins are about 1 / 3 dry, and the relative humidity is controlled at 78-80%;

[0031] Stage 6: Late color fixation, the end of the stage is when the leaves and veins are completely dry, and the relative humidity is controlled at 75-78%;

[0032] The seventh stage: the early stage of rib drying, the end of the stage is that the leaves and veins are basically dry, the ribs turn dark brown and shrink, and the relative humidity is controlled at 70-75%;

[0033] The eighth stage: the late stage of drying ribs. The end of the stage is characterized by the smoke ribs becoming concave, black, completely dry, and easy to break. The relative humidity is controlled at <70%.

[0034] In the above implementation, the lower leaves refer to the 1st to 6th leaves from the bottom to the top of the tobacco plant after removing the foot leaves;

[0035] The middle leaves refer to the 7th to 12th leaves from the bottom to the top of the tobacco plant after removing the base leaves;

[0036] The upper leaves refer to the 10th to 18th leaves from the bottom to the top of the tobacco plant after removing the base leaves.

[0037] Preferably, the temperature difference of the lower leaves, middle leaves and upper leaves of the cigar tobacco leaves at the same stage increases by 1-2°C.

[0038] In the above implementation, doors and windows should be opened for ventilation every day to reduce the impurities in tobacco leaves after drying. Ventilation does not conflict with moisturizing and humidification, and they are two different things. The difference in temperature and humidity outside is an important indicator of ventilation. Under the condition that the temperature and humidity required for drying are not affected, ventilation should be carried out to the maximum extent (for a long time). Therefore, ventilation should be carried out when the difference in temperature and humidity inside and outside the drying room is small, generally at night or early in the morning, and ventilation should be carried out at least once a day.

[0039] Dehumidification and moisturizing are the key elements throughout the entire cigar drying process. Dehumidification and moisturizing are required at every stage. The main purpose is to slowly reduce the humidity. It cannot stop decreasing, but it cannot decrease too much either.

[0040] Dehumidification: Combine ventilation and dehumidification to make full use of the external environment. Dehumidification should be done during the day in rainy weather and at night in fine weather. Be flexible and adaptable according to the actual situation. When the external temperature and humidity match the temperature and humidity required for drying, the leaves can be dried naturally for a long time in the natural mode. Remember not to open the window for a long time to dehumidify when the temperature and humidity inside and outside the drying room are very different, which can easily cause the humidity in the drying room to drop sharply and the leaves to become stiff.

[0041] Moisturizing: During the yellowing stage, tobacco leaves are relatively fresh and lively, with high water content and a relative humidity of not less than 85%. The tobacco leaves feel cool and dry to the touch. If the humidity is insufficient, moisturizing cotton can be used to replenish water or a humidifier can be used. During the browning stage, tobacco leaves should feel moist to the touch, with a relative humidity of 80-85%. If the humidity is insufficient, it is mainly recommended to use a humidifier. The humidifier should be moved to avoid the leaves being stained with clear water. Adding clear water requires caution, because many leaf tips are dry at this stage, and the condensed water is easily turned black by reabsorption. It is recommended to use a humidifier and move the humidifier during the color fixing stage and the dry tendon stage. The tobacco leaves feel oily when touched during the color fixing stage, and elastic when touched during the early stage of the dry tendon stage. The petioles turn brown and are easy to break, and the tobacco leaves are completely dry.

[0042] The air-drying method includes:

[0043] At first glance, observe the changes in tobacco leaves in each area, observe the temperature and humidity in each area of ​​the room, and the temperature and humidity of the environment outside the room.

[0044] Second, based on the observations, determine the stage of tobacco drying in each area, determine the temperature and humidity required for tobacco drying based on the drying process, and make an overall judgment on the drying room conditions.

[0045] The third step is to determine the drying ideas based on the judgment results, such as whether the drying room needs to be heated, humidified, ventilated or dehumidified.

[0046] Fourth, take actions according to the drying ideas. For example, heating requires turning on a hot air blower or heat pump, humidification requires turning on a humidifier, ventilation or dehumidification requires opening doors and windows, axial fans, floor blowers, etc., or fully utilizing the appropriate temperature and humidity outside. To fully utilize the external environment, we must fully and deeply understand and utilize the dew point temperature of humid hot air, and use a psychrometric chart calculator to calculate. If condensation occurs during external ventilation, external ventilation should not be used (or the time should be shortened), and internal circulation peristaltic air drying should be adopted.

[0047] Preferably, the temperature of the first stage of the lower leaves of the cigar tobacco is 23-25°C.

[0048] Preferably, the temperature of the first stage of the middle leaves of the cigar tobacco leaves is 24-26°C.

[0049] Preferably, the temperature of the first stage of the middle leaves of the cigar tobacco leaves is 25-27°C.

[0050] Preferably, the air-drying time of the lower leaves of cigar tobacco in the first stage is 3-5 days, the air-drying time of the second stage is 3-5 days, the air-drying time of the third stage is 4-6 days, the air-drying time of the fourth stage is 4-6 days, the air-drying time of the fifth stage is 2-4 days, the air-drying time of the sixth stage is 2-4 days, the air-drying time of the seventh stage is 5-7 days, and the air-drying time of the eighth stage is 5-7 days. The air-drying time of the middle leaves of cigar tobacco in each stage is increased by 1 day compared with the lower leaves, and the air-drying time of the upper leaves of cigar tobacco in each stage is increased by 1 day compared with the middle leaves.

[0051] Drying process operation guide:

[0052] 1. It is necessary to clearly understand the key areas, the stage of tobacco leaves in the key areas, the temperature and humidity required for each stage, and control the temperature and humidity according to the required temperature and humidity in the key areas.

[0053] 2. The drying process is a slow dehumidification process. The humidity must not drop drastically, but should drop slowly. The humidity can drop by 0.4-2% a day as a reference, including the drying period.

[0054] 3. Use moisturizing cotton skillfully. When the ground is wet, the moisturizing cotton absorbs moisture. When the humidity is insufficient, you can evenly sprinkle water to replenish moisture. The moisture content of the moisturizing cotton is measured by the water seeping out after stepping on it.

[0055] 4. Rationally load and roast. The 6th to 7th layers have high temperature and low humidity, so no yellow tobacco leaves are put in, only brown tobacco leaves. The first layer has low temperature and high humidity, so tobacco leaves after the yellow stage are prone to mold and rot over time. When the tobacco leaves turn yellow, the pole should be raised in time.

[0056] 5. Scientifically and rationally adjust and combine the poles. When the tobacco leaves are separated, the moisture can be appropriately increased, and the drying room capacity can be increased. In the late yellowing stage, each grid can be increased to about 12 poles, and in the browning stage, it can be increased to about 15-16 poles.

[0057] 6. Dry tobacco flexibly according to the characteristics of the air-drying room and the in-depth understanding of the process. You must have a full understanding of the characteristics of the air-drying room and be very clear about the temperature and humidity requirements for tobacco leaves, so that you can be targeted and dry high-quality tobacco leaves.

[0058] 7. When the tobacco leaves are completely dry, the humidity should be controlled and the leaves should be taken off the shelves in time. This can effectively reduce the electricity cost of drying. If the leaves are not taken off the shelves for a long time, the leaves will absorb moisture and become moldy and dark in color.

[0059] Example 1

[0060] A method for drying cigar tobacco leaves, wherein the cigar tobacco leaves are lower leaves;

[0061] The drying stage includes:

[0062] The first stage: from the wilting stage to the early stage of yellowing, the temperature is 23℃, the number of days of drying is 3 days, and the relative humidity is reduced by 1.5% every day; the relative humidity at the beginning of the stage is 95.5%, and the end of the stage is characterized by the leaves becoming soft and wilting, the green color of the tobacco leaves fades, and the leaves turn yellow 4-6 layers, and the relative humidity is 91%;

[0063] The second stage: the late yellowing stage, the temperature is 24℃, the number of days for air-drying is 3 days, and the relative humidity is reduced by 1% every day; the end of the stage is that the leaves turn yellow 9-10 layers and turn brown synchronously, and the relative humidity is 88%;

[0064] The third stage: the early stage of browning, the temperature is 25℃, the number of days of drying is 4 days, and the relative humidity is reduced by 1% every day; the end of the stage is that the color of the tobacco leaves turns into dark brown, browning 8-9 layers, the veins begin to turn brown, and the relative humidity is 84%;

[0065] The fourth stage: the late stage of browning, the temperature is 26℃, the air-drying time is 4 days, and the relative humidity is reduced by 0.7% per day; the end of the stage is that the tobacco leaves and veins are completely brown, and the relative humidity is 81.2%;

[0066] The fifth stage: the early stage of color fixing, the temperature is 27℃, the air-drying time is 2 days, the relative humidity is reduced by 1% every day, the end of the stage is that the tobacco leaves are fixed in color, the leaves are completely dry, the veins are about 1 / 3 dry, and the relative humidity is 79.2%;

[0067] Stage 6: Color fixation stage, temperature is 28℃, air-drying time is 2 days, relative humidity is reduced by 1.5% per day, the end of the stage is when leaves and veins are completely dry, relative humidity is controlled at 76.2%;

[0068] The seventh stage: the early stage of drying, the temperature is 29℃, the air-drying time is 5 days, and the relative humidity is dehumidified at a rate of 0.6% per day. The end of the stage is that the leaves and veins are basically dry, the tobacco tendons turn dark brown and shrink, and the relative humidity is 73.2%;

[0069] The eighth stage: the late stage of drying, the temperature is 30℃, the drying time is 5 days, and the relative humidity is dehumidified at a rate of 1% per day. The end of the stage is that the smoke ribs are concave, black, completely dry, and easy to break, and the relative humidity is 67.2%.

[0070] Cigar tobacco is the middle leaf;

[0071] The drying stage includes:

[0072] The first stage: from the wilting stage to the early stage of yellowing, the temperature is 24℃, the number of days of air-drying is 4 days, and the relative humidity is dehumidified at a rate of 1% per day; the relative humidity at the beginning of the stage is 96%, and the end of the stage is characterized by the leaves becoming soft and wilting, the green color of the tobacco leaves fades, and the leaves turn yellow 4-6 layers, and the relative humidity is 92%;

[0073] The second stage: the late yellowing stage, the temperature is 25℃, the number of days for air-drying is 4 days, and the relative humidity is reduced by 1% every day; the end of the stage is that the leaves turn yellow 9-10 layers and turn brown synchronously, and the relative humidity is 88%;

[0074] The third stage: the early stage of browning, the temperature is 26℃, the number of days of drying is 5 days, and the relative humidity is reduced by 1% every day; the end of the stage is that the color of the tobacco leaves turns dark brown, browning 8-9 layers, the veins begin to turn brown, and the relative humidity is 83%;

[0075] The fourth stage: the late stage of browning, the temperature is 27℃, the air-drying time is 5 days, and the relative humidity is reduced by 0.5% per day; the end of the stage is that the tobacco leaves and veins are completely brown, and the relative humidity is 80.5%;

[0076] The fifth stage: the early stage of color fixing, the temperature is 28℃, the air-drying time is 3 days, and the relative humidity is reduced by 0.6% every day. The end of the stage is that the tobacco leaves are fixed in color, the leaves are completely dry, the veins are about 1 / 3 dry, and the relative humidity is 78.7%;

[0077] Stage 6: late color fixing stage, temperature is 29℃, air-drying time is 3 days, relative humidity is reduced by 1% per day, the end of the stage is when leaves and veins are completely dry, relative humidity is controlled at 75.7%;

[0078] The seventh stage: the early stage of drying, the temperature is 30℃, the air-drying time is 6 days, and the relative humidity is dehumidified at a rate of 0.6% per day. The end of the stage is that the leaves and veins are basically dry, the tobacco tendons turn dark brown and shrink, and the relative humidity is 72.1%;

[0079] The eighth stage: the late stage of drying, the temperature is 31°C, the drying time is 6 days, and the relative humidity is dehumidified at a rate of 1% per day. The end of the stage is that the smoke ribs are concave, black, completely dry, and easy to break, and the relative humidity is 66.1%.

[0080] Cigar tobacco is the upper leaf;

[0081] The drying stage includes:

[0082] The first stage: from the wilting stage to the early stage of yellowing, the temperature is 25℃, the number of days of air-drying is 5 days, and the relative humidity is reduced by 0.8% every day; the relative humidity at the beginning of the stage is 96%, and the end of the stage is characterized by the leaves becoming soft and wilting, the green color of the tobacco leaves fades, and the leaves turn yellow 4-6 layers, and the relative humidity is 92%;

[0083] The second stage: the late yellowing stage, the temperature is 26℃, the number of days for air-drying is 5 days, and the relative humidity is reduced by 0.8% per day; the end of the stage is that the leaves turn yellow 9-10 layers and turn brown synchronously, and the relative humidity is 88%;

[0084] The third stage: the early stage of browning, the temperature is 27℃, the number of days of drying is 6 days, and the relative humidity is reduced by 0.8% every day; the end of the stage is that the color of the tobacco leaves turns dark brown, browning 8-9 layers, the veins begin to turn brown, and the relative humidity is 83.2%;

[0085] The fourth stage: the late stage of browning, the temperature is 28℃, the air-drying time is 6 days, and the relative humidity is reduced by 0.5% per day; the end of the stage is that the tobacco leaves and veins are completely brown, and the relative humidity is 80.2%;

[0086] The fifth stage: the early stage of color fixing, the temperature is 29℃, the air-drying time is 4 days, the relative humidity is reduced by 0.5% every day, the end of the stage is the color fixing of tobacco leaves, the leaves are completely dry, the veins are about 1 / 3 dry, and the relative humidity is 78.2%;

[0087] Stage 6: Color fixation stage, temperature is 30℃, air-drying time is 4 days, relative humidity is reduced by 0.6% per day, the end of the stage is when leaves and veins are completely dry, relative humidity is controlled at 76.2%;

[0088] The seventh stage: the early stage of drying, the temperature is 31℃, the air-drying time is 7 days, and the relative humidity is dehumidified at a rate of 0.6% per day. The end of the stage is that the leaves and veins are basically dry, the tobacco tendons turn dark brown and shrink, and the relative humidity is 72.0%;

[0089] The eighth stage: the late stage of drying, the temperature is 32℃, the drying time is 7 days, and the relative humidity is dehumidified at a rate of 1% per day. The end of the stage is that the smoke ribs are concave, black, completely dry, and easy to break, and the relative humidity is 65.1%.

[0090] When air-cured tobacco leaves are harvested, the maturity of the tobacco leaves is based on the standard of "suitable maturity and early harvest". The SPAD green value of the lower leaves is about 36, the SPAD green value of the middle leaves is about 42, and the SPAD green value of the upper leaves is about 45.

[0091] The upper leaves, middle leaves and lower leaves obtained by air-drying in Example 1 were fermented, rolled and aged according to the same conventional process, and then sensory evaluation was performed. The number of people who evaluated and smoked was 20, and the sensory scores were averaged. The judgment criteria refer to Table 1, and the sensory evaluation results refer to Table 2;

[0092] Table 1

[0093] index 1-3 4-6 7-9 Fragrance Very poor to poor Slightly worse to slightly better Good to Very Good Aroma volume Very little to less Slightly less to adequate Somewhat sufficient to very sufficient concentration Very light to light Slightly light to slightly dark Strong to Very Strong Softness Rough to moderately rough Medium to soft Soft to mild Aftertaste Heavy to slight residue Slightly residual to slightly clean Clean to Very Clean Miscellaneous gas Very heavy to heavy Slightly heavy to slightly Slightly to None Irritant Very large to large Slightly larger to slightly Slightly to None Combustibility Poor to poor Slightly better to fairly good Better to Good grey Black to dark gray Gray to grayish white Gray to white

[0094] Table 2

[0095]

[0096]

[0097] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cigar tobacco leaf airing process, characterized in that: According to the drying stage of tobacco leaves, when the tobacco leaves enter the next stage of drying, the temperature is increased by 1°C, and the relative humidity is reduced by 0.4-2% per day; The drying stage includes: The first stage: from the wilting stage to the early stage of yellowing. The end of the stage is characterized by the leaves becoming soft and wilting, the green color of the tobacco leaves fading, and turning yellow 4-6 layers. The relative humidity is controlled at 90-95%; The second stage: the late yellowing stage, the end of the stage is that the leaves turn yellow 9-10 layers, and turn brown synchronously, and the relative humidity is controlled at 85-90%; The third stage: the early stage of browning. The end of the stage is that the tobacco leaves turn dark brown, turn 8-9 layers brown, the veins begin to turn brown, and the relative humidity is controlled at 82-85%; The fourth stage: the late stage of browning, the end of the stage is that the tobacco leaves and veins are completely brown, and the relative humidity is controlled at 80-82%; The fifth stage: the early stage of color fixation. The end of the stage is that the tobacco leaves are fixed in color, the leaves are completely dry, the veins are about 1 / 3 dry, and the relative humidity is controlled at 78-80%; Stage 6: Late color fixation, the end of the stage is when the leaves and veins are completely dry, and the relative humidity is controlled at 75-78%; The seventh stage: the early stage of rib drying, the end of the stage is that the leaves and veins are basically dry, the ribs turn dark brown and shrink, and the relative humidity is controlled at 70-75%; The eighth stage: the late stage of drying ribs. The end of the stage is characterized by the smoke ribs becoming concave, black, completely dry, and easy to break. The relative humidity is controlled at <70%.

2. The cigar tobacco leaf airing process according to claim 1, characterized in that: The temperature difference of the lower leaves, middle leaves and upper leaves of cigar tobacco increases by 1-2℃ at the same stage.

3. The cigar tobacco leaf airing process according to claim 1, characterized in that: The temperature of the first stage of the lower leaves of cigar tobacco is 23-25°C.

4. The cigar tobacco leaf airing process according to claim 1, characterized in that: The temperature of the first stage of the middle leaf of cigar tobacco is 24-26°C.

5. The cigar tobacco leaf airing process according to claim 1, characterized in that: The temperature of the first stage of the middle leaf of cigar tobacco is 25-27°C.

6. The cigar tobacco leaf airing process according to claim 1, characterized in that: The first stage air-drying time of the lower leaves of cigar tobacco is 3-5 days, the second stage air-drying time is 3-5 days, the third stage air-drying time is 4-6 days, the fourth stage air-drying time is 4-6 days, the fifth stage air-drying time is 2-4 days, the sixth stage air-drying time is 2-4 days, the seventh stage air-drying time is 5-7 days, and the eighth stage air-drying time is 5-7 days. The air-drying time of each stage of the middle leaves of cigar tobacco is increased by 1 day compared with the lower leaves, and the air-drying time of each stage of the upper leaves of cigar tobacco is increased by 1 day compared with the middle leaves.

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