A tobacco leaf flavoring and softening roasting process

Abstract

The application discloses a tobacco aroma-improving and softness-increasing baking process, which comprises the following steps: S1, modifying the moisture exhaust port of a curing barn, connecting a flavor recovery device through a valve, and containing a filter and absorption material tank in the flavor recovery device, wherein a filter and absorption material core is arranged in the inner cavity of the filter and absorption material tank; S2, selecting fresh tobacco leaves, detecting the moisture content of the tobacco leaves, classifying and packing the tobacco leaves according to the water content and the maturity of the tobacco leaves, and ensuring the same quality in the same bundle; S3, igniting, increasing the dry ball temperature to 35 DEG C and controlling the wet ball temperature at 32-33 DEG C for 4-6 hours, starting the fan at a low speed, and stabilizing the temperature for 14 hours; and S4, increasing the dry ball temperature to 38 DEG C at a rate of 1 DEG C per 2 hours, controlling the wet ball temperature at 34-35 DEG C, keeping the fan at a low speed, and stabilizing the temperature for 24 hours. The application has the beneficial effects that the conversion degree of the contents in the tobacco leaves is effectively improved, the softness of the tobacco leaves is significantly improved, the color is uniform, the hardening of the tobacco leaves is effectively avoided, and the overall quality of the tobacco leaves is improved.

Description

Technical Field

[0001] This invention relates to the field of tobacco curing technology, specifically a tobacco curing process for enhancing aroma and smoothness. Background Technology

[0002] Tobacco curing is a crucial step in tobacco production, directly impacting the final quality and economic benefits of the tobacco leaves. Currently, traditional tobacco curing processes are mainly divided into three stages: yellowing, color fixing, and drying. Yellowing, color fixing, and drying are achieved by controlling temperature and humidity. However, during the prolonged curing process, a significant amount of aroma components and volatile oils are lost due to forced dehumidification, resulting in insufficient aroma and low oil content in the cured tobacco leaves.

[0003] To address these issues, researchers have been exploring new curing processes that aim to preserve aroma and oil content as much as possible while fully converting the substances within the tobacco leaves, thereby improving the quality and economic benefits of the tobacco. Therefore, developing a curing process that can recover the aroma and oil content volatilized during the curing process, thus enhancing the aroma and oil content of the cured tobacco leaves, is of great significance for improving the overall quality and usability of tobacco leaves.

[0004] Traditional tobacco curing processes fail to fully realize the potential value of tobacco leaves, resulting in incomplete material transformation, insufficient aroma, and stiff leaves after curing, which affects the quality and economic benefits of the final product. Furthermore, existing curing processes lack aroma and volatile oil recovery systems, leading to the loss of a large number of aroma components and volatile oil components during forced dehumidification. To address these issues, we propose a tobacco curing process for enhancing aroma and smoothing the leaves. Summary of the Invention

[0005] The purpose of this invention is to provide a tobacco leaf aroma-enhancing and softening roasting process to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a tobacco leaf aroma-enhancing and softening roasting process, comprising the following steps:

[0007] S1. Modify the exhaust vent of the drying room and connect it to an aroma recovery device through a valve. The aroma recovery device includes a filter absorption material tank and a filter absorption material core is installed in the inner cavity of the filter absorption material tank.

[0008] S2. Select fresh tobacco leaves, test the moisture content of the tobacco leaves, and classify and pack the tobacco according to the moisture content and maturity of the tobacco leaves to ensure that the same quality is used in the same pack.

[0009] S3, ignite, raise the dry bulb temperature to 35℃ in 4-6 hours, control the wet bulb temperature at 32-33℃, turn on the fan at low speed, and stabilize the temperature for 14 hours.

[0010] S4. Raise the dry bulb temperature to 38°C at a rate of 1°C every 2 hours, and keep the wet bulb temperature at 34-35°C. Keep the fan at a low speed and maintain the temperature for 24 hours.

[0011] S5. Raise the dry bulb temperature to 42°C at a rate of 1°C every 2.5 hours, and control the wet bulb temperature at 36°C. Switch the fan to high speed, open the valve of the aroma recovery device, and the emitted aroma is transported into the filter absorption material tank. Stabilize the temperature for 14 hours.

[0012] S6. Raise the dry bulb temperature to 42°C at a rate of 1°C every 2.5 hours, control the wet bulb temperature at 36°C, switch the fan to high speed, open the aroma recovery device valve, and the emitted aroma is transported to the filter absorption material tank and stabilized at the temperature for 14 hours.

[0013] S7. Raise the dry bulb temperature to 54°C at a rate of 1°C per 1.5 hours, control the wet bulb temperature at 38°C, keep the fan at high speed, keep the aroma recovery device valve open, and maintain the temperature for 14 hours.

[0014] S8. Raise the dry bulb temperature to 68°C at a rate of 1°C per hour, control the wet bulb temperature at 40°C, switch the fan to low speed, keep the aroma recovery device valve open, and maintain the temperature for 20 hours.

[0015] S9. Remove the filter material core from the aroma recovery device and obtain a volatile oil-water emulsion by distillation and dispersion;

[0016] S10. Dilute the water emulsion and atomize it evenly onto the surface of the tobacco leaves after drying.

[0017] Preferably, in step S1, the air inlet of the filter and absorbent material is connected to the dehumidification outlet of the drying oven via a pipe, and a control valve is installed on the pipe to open during the color-setting period and close during the remaining stages.

[0018] Preferably, in step S2, the moisture content of the tobacco leaves is detected by an oven drying method or a rapid moisture meter. Based on the moisture content, the tobacco leaves are divided into three categories: high moisture content tobacco leaves, medium-low moisture content tobacco leaves, and low moisture content tobacco leaves, and then processed into cigarettes and packaged separately.

[0019] Preferably, the filter material core in step S1 is selected from one or more combinations of activated carbon fiber, porous ceramics, and polymer adsorption resin, and is used to adsorb the aroma components and volatile oil components that volatilize during the baking process.

[0020] Preferably, the aroma recovery device in step S5 is activated at the same time as the blower is switched to high speed, and the negative pressure generated by the high-speed blower is used to transport the volatile aroma components in the drying room to the filter absorption material tank.

[0021] Preferably, the distillation in step S9 is steam distillation, with a distillation temperature of 100-120℃ and a distillation time of 2-4 hours. After collecting the distillate, it is allowed to stand and separate into layers, and the oil phase is taken for dispersion treatment.

[0022] Preferably, in step S9, the dispersion is achieved by mixing the distilled volatile oil with an emulsifier and water in a certain proportion, followed by high-speed shearing or high-pressure homogenization to form an oil-in-water volatile oil emulsion. The emulsifier is selected from one or more of Tween-80, Span-80, or soybean lecithin.

[0023] Preferably, in step S10, the water emulsion is diluted 5-20 times, and the atomization is carried out by electrostatic spraying or compressed air atomization to make the emulsion evenly adhere to the surface of the tobacco leaves after drying, with the atomization amount being 0.5%-3% of the weight of the tobacco leaves.

[0024] Preferably, during the 20-hour temperature stabilization period in step S8, a short-term dehumidification operation is performed every 4-6 hours, with a dehumidification time of 5-10 minutes.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. This invention effectively improves the conversion degree of substances contained in tobacco leaves by precisely controlling key parameters such as the temperature stabilization time and wet-bulb temperature during the yellowing period and the pre-coloring period. It solves the problem of insufficient conversion of substances in tobacco leaves after curing in traditional processes, significantly improves the softness of the leaves and makes the color uniform, effectively avoids the phenomenon of stiff leaves, and improves the overall quality of tobacco leaves.

[0027] 2. This invention connects an aroma recovery device with a filter absorption material tank to the dehumidification port of the curing barn. During the color-fixing and drying stages, the valve is opened to recover the aroma components and volatile oils volatilized during the curing process. The volatile oils are then distilled and dispersed to form a water-oil emulsion, which is then uniformly atomized and applied back to the surface of the tobacco leaves after curing. This effectively recovers a large amount of aroma and oil lost during forced dehumidification in traditional processes, significantly improving the aroma intensity and oil content of the cured tobacco leaves, thereby increasing the proportion of high-grade tobacco and economic benefits. Attached Figure Description

[0028] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1 This invention provides a technical solution: a tobacco leaf aroma-enhancing and softening roasting process, comprising the following steps:

[0031] S1. Modify the exhaust vent of the baking oven and connect it to an aroma recovery device via a valve. The aroma recovery device includes a filter absorption material tank, and a filter absorption material core is installed inside the filter absorption material tank. The air inlet of the filter absorption material is connected to the exhaust vent of the baking oven via a pipe, and a control valve is installed on the pipe to open during the color-fixing period and close during other stages. The filter absorption material core is selected from one or more combinations of activated carbon fiber, porous ceramics, and polymer adsorption resin, and is used to adsorb the aroma components and volatile oil components that volatilize during the baking process.

[0032] S2. Select fresh tobacco leaves, test their moisture content, and classify and pack them into tobacco leaves according to their moisture content and maturity to ensure that they are of the same quality. The moisture content of the tobacco leaves is tested using an oven drying method or a rapid moisture meter. Based on the moisture content, the tobacco leaves are divided into three categories: high moisture content tobacco leaves, medium-low moisture content tobacco leaves, and low moisture content tobacco leaves. Each category is then processed for packing and processing.

[0033] S3. Ignite, and raise the dry bulb temperature to 35℃ in 4-6 hours, while keeping the wet bulb temperature at 32-33℃. Turn on the fan at low speed and stabilize the temperature for 14 hours.

[0034] S4. Raise the dry bulb temperature to 38°C at a rate of 1°C every 2 hours, and keep the wet bulb temperature at 34-35°C. Keep the fan at a low speed and maintain the temperature for 24 hours.

[0035] S5. Raise the dry bulb temperature to 42℃ at a rate of 1℃ every 2.5 hours, and control the wet bulb temperature at 36℃. Switch the fan to high speed, open the valve of the aroma recovery device, and the emitted aroma is guided into the filter absorption material tank. Stabilize the temperature for 14 hours. The opening time of the aroma recovery device is synchronized with the fan switching to high speed. The negative pressure generated by the high speed fan is used to guide the volatile aroma components in the drying room to the filter absorption material tank.

[0036] S6. Raise the dry bulb temperature to 42°C at a rate of 1°C every 2.5 hours, and control the wet bulb temperature at 36°C. Switch the fan to high speed, open the valve of the aroma recovery device, and the emitted aroma is guided into the filter absorption material tank. Stabilize the temperature for 14 hours.

[0037] S7. Raise the dry bulb temperature to 54°C at a rate of 1°C per 1.5 hours, control the wet bulb temperature at 38°C, keep the fan at high speed, keep the aroma recovery device valve open, and maintain the temperature for 14 hours.

[0038] S8. Raise the dry bulb temperature to 68℃ at a rate of 1℃ per hour, and control the wet bulb temperature at 40℃. Turn the fan to low speed and keep the aroma recovery device valve open. Maintain the temperature for 20 hours. During the 20-hour period of temperature stabilization, perform a short-term dehumidification operation every 4-6 hours for 5-10 minutes.

[0039] It should be noted that in steps S3-S8, the low speed setting of the fan is 40%-60% of the rated speed of the fan, and the high speed setting of the fan is 80%-100% of the rated speed of the fan.

[0040] S9. Remove the filter material core from the aroma recovery device and obtain a volatile oil-water emulsion by distillation and dispersion. The distillation is carried out by steam distillation at a temperature of 100-120℃ for 2-4 hours. After collecting the distillate, allow it to stand and separate into layers. Take the oil phase for dispersion treatment.

[0041] S10. Dilute the water emulsion and atomize it evenly on the surface of the tobacco leaves after the kiln. The water emulsion is diluted 5-20 times. Atomization is carried out by electrostatic spraying or compressed air atomization to make the emulsion evenly adhere to the surface of the tobacco leaves after the kiln. The atomization amount is 0.5%-3% of the weight of the tobacco leaves.

[0042] Example 1

[0043] This embodiment provides a tobacco leaf aroma-enhancing and mellowing roasting process, which specifically includes the following steps:

[0044] Step 1: In this embodiment, mature tobacco leaves from the middle part of the plant are selected. The moisture content of the fresh tobacco is 82.5% as determined by the oven drying method. The tobacco is then bundled and packaged according to the category of high moisture content tobacco leaves to ensure that the same type of tobacco is used and of the same quality.

[0045] Step 2: Before baking, connect the exhaust vent of the baking room to the aroma recovery device through a pipe. Install a control valve on the pipe and fill the filter absorption material tank with activated carbon fiber filter absorption material core.

[0046] Step 3: After ignition, bake according to the following temperature and humidity program:

[0047] Yellowing period: Raise the dry bulb temperature to 35℃ and control the wet bulb temperature at 32.5℃ in 5 hours, turn the fan on low speed (50% of rated speed) and stabilize the temperature for 14 hours; then raise the dry bulb temperature to 38℃ at a rate of 1℃ every 2 hours and control the wet bulb temperature at 34.5℃, keep the fan on low speed and stabilize the temperature for 24 hours.

[0048] Color fixation period: Raise the dry bulb temperature to 42°C at a rate of 1°C every 2.5 hours, while keeping the wet bulb temperature at 36°C. At this time, switch the fan to high speed (90% of rated speed) and simultaneously open the valve of the aroma recovery device. Use the negative pressure generated by the high-speed fan to guide the volatile aroma components to the filter absorption material tank for adsorption. Stabilize the temperature for 14 hours. Then raise the dry bulb temperature to 48°C at a rate of 1°C every 2 hours, while keeping the wet bulb temperature at 37°C. Keep the fan at high speed and keep the valve open. Stabilize the temperature for 14 hours.

[0049] Color fixation period: Raise the dry bulb temperature to 42°C at a rate of 1°C every 2.5 hours, while keeping the wet bulb temperature at 36°C. At this time, switch the fan to high speed (90% of rated speed) and simultaneously open the valve of the aroma recovery device. Use the negative pressure generated by the high-speed fan to guide the volatile aroma components to the filter absorption material tank for adsorption. Stabilize the temperature for 14 hours. Then raise the dry bulb temperature to 48°C at a rate of 1°C every 2 hours, while keeping the wet bulb temperature at 37°C. Keep the fan at high speed and keep the valve open. Stabilize the temperature for 14 hours.

[0050] Step 4: After baking, remove the activated carbon fiber filter material core and distill it at 110℃ for 3 hours using steam distillation. Collect the distillate and allow it to separate into layers. Take the oil phase and mix it with Tween-80 emulsifier and water in a certain proportion. Then, process it with high-speed shearing to form an oil-in-water emulsion. Dilute the emulsion 10 times and atomize it evenly on the surface of the dried tobacco leaves using electrostatic spraying. The atomization amount is 1.5% of the weight of the tobacco leaves.

[0051] The tobacco leaves processed by the process in this embodiment have a uniform golden color, significantly improved leaf softness, rich and lasting aroma, and significantly increased oil content. The proportion of high-grade tobacco is increased by about 25% compared with the traditional process.

[0052] Example 2

[0053] This embodiment provides a tobacco leaf aroma-enhancing and mellowing roasting process, which specifically includes the following steps:

[0054] Step 1: In this embodiment, mature tobacco leaves from the upper part of the plant are selected. The moisture content of the fresh tobacco is 76.2% as measured by a rapid moisture analyzer. The tobacco is then bundled and packaged according to the medium and low moisture content tobacco leaf category to ensure that the tobacco leaves are of the same quality and type.

[0055] Step 2: Before baking, connect the exhaust port of the baking room to the aroma recovery device through a pipe, fill the filter absorption material tank with a polymer adsorption resin filter material core, and install a control valve on the air inlet pipe.

[0056] Step 3: After ignition, bake according to the following temperature and humidity program:

[0057] Yellowing period: Raise the dry bulb temperature to 35°C in 4 hours, keep the wet bulb temperature at 32°C, turn the fan on low speed (45% of rated speed), and stabilize the temperature for 14 hours; then raise the dry bulb temperature to 38°C at a rate of 1°C every 2 hours, keep the wet bulb temperature at 35°C, keep the fan on low speed, and stabilize the temperature for 24 hours.

[0058] Color fixation period: Raise the dry bulb temperature to 42°C at a rate of 1°C every 2.5 hours, and control the wet bulb temperature at 36°C. Switch the fan to high speed (100% rated speed), and simultaneously open the aroma recovery device valve. Stabilize the temperature for 14 hours. Then raise the dry bulb temperature to 48°C at a rate of 1°C every 2 hours, and control the wet bulb temperature at 37°C. Keep the fan at high speed and keep the valve open. Stabilize the temperature for 14 hours.

[0059] Drying period: Raise the dry bulb temperature to 54°C at a rate of 1°C per 1.5 hours, and control the wet bulb temperature at 38°C. Keep the fan at high speed and the valve open, and maintain the temperature for 14 hours. Finally, raise the dry bulb temperature to 68°C at a rate of 1°C per hour, and control the wet bulb temperature at 40°C. Switch the fan to low speed, keep the valve open, and maintain the temperature for 20 hours. During this period, perform a short dehumidification operation every 6 hours for 10 minutes.

[0060] Step 4: After baking, remove the polymer adsorption resin filter core and distill it at 120℃ for 2 hours using steam distillation. Collect the distillate and allow it to separate into layers. Take the oil phase and mix it with soybean lecithin emulsifier and water in a certain proportion. After high-pressure homogenization, form a volatile oil-water emulsion. Dilute the emulsion 15 times and atomize it evenly on the surface of the dried tobacco leaves using compressed air atomization, with an atomization amount of 2% of the tobacco leaf weight.

[0061] The upper tobacco leaves processed by the process in this embodiment show significant improvement in leaf quality, effectively solving the problem of stiffness. The aroma component content is increased by about 28% compared to the traditional process, and the oil content is sufficient. Both the appearance quality and internal quality are significantly improved.

[0062] Comparative Example

[0063] This comparative example uses the traditional three-stage tobacco curing process without an aroma recovery device. The specific process parameters are as follows:

[0064] The same batch of mid-mature tobacco leaves as in the example were selected, and the tobacco packing method was the same as in the example.

[0065] After ignition, control the temperature and humidity according to the traditional baking procedure:

[0066] Yellowing stage: Directly raise the dry bulb temperature to 38℃, control the wet bulb temperature at 36℃, run the fan at low speed, and adjust the temperature stabilization time flexibly according to the degree of yellowing of the tobacco leaves, about 30-36 hours, without performing phased temperature stabilization control during this period;

[0067] Color fixation period: After the dry bulb temperature rises to 42℃, it quickly rises to 48-50℃, the wet bulb temperature is controlled at 37-38℃, the fan runs at medium speed, the heating rate is about 1℃ every 1.5 hours, the total time for the color fixation stage is about 20-24 hours, without fine-grained segmented temperature and humidity control.

[0068] Drying stage: Raise the dry bulb temperature to 68℃ at a relatively fast rate, control the wet bulb temperature at 41-42℃, run the fan at low speed, and stabilize the temperature until the main vein of the tobacco leaf is completely dry. The total time is about 12-16 hours.

[0069] No aroma recovery device was connected during the entire baking process. The volatile aroma components and volatile oil components generated during baking were directly released into the atmosphere through forced dehumidification.

[0070] The test results of the tobacco leaf samples after burning are shown in Table 1:

[0071]

[0072] The results showed that traditional processes, lacking precise temperature and humidity control and stable temperature management, resulted in insufficient transformation of the substances within the tobacco leaves, leading to stiff leaves and insufficient aroma. Furthermore, the absence of an aroma recovery device resulted in the loss of a significant amount of aroma components and volatile oils during forced dehumidification. The total aroma components of the cured tobacco leaves were reduced by approximately 25.8% compared to the process of this invention, and the volatile oil content was reduced by approximately 43.7%, resulting in significantly lower oil content. In contrast, the tobacco leaves processed using the method of Example 1 of this invention, through precise control of key parameters such as stable temperature time and wet-bulb temperature during the yellowing and pre-coloring stages, combined with the recovery and reapplication of the aroma recovery device, effectively improved the degree of substance transformation in the tobacco leaves, significantly increasing the aroma and oil content of the cured tobacco leaves.

[0073] In summary, the tobacco leaf aroma-enhancing and softening curing process provided by this invention effectively solves the core problems of insufficient tobacco leaf material transformation and significant loss of aroma and volatile oils due to forced dehumidification in existing processes. This is achieved by introducing a refined temperature, humidity, and stable temperature time control strategy based on the quality of fresh tobacco leaves into the traditional three-stage curing process, combined with online collection of aroma components and emulsion reapplication technology at the dehumidification outlet. Example data shows that the process of this invention can significantly improve the softness, color uniformity, and proportion of high-quality tobacco leaves after curing, and greatly increase the total amount of aroma components and volatile oil content, demonstrating outstanding effects on improving tobacco leaf quality, enriching aroma composition, and enhancing oil content.

[0074] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tobacco leaf aroma-enhancing and mellowing roasting process, characterized in that, The steps include the following: S1. Modify the exhaust vent of the drying room and connect it to an aroma recovery device through a valve. The aroma recovery device includes a filter absorption material tank and a filter absorption material core is installed in the inner cavity of the filter absorption material tank. S2. Select fresh tobacco leaves, test the moisture content of the tobacco leaves, and classify and pack the tobacco according to the moisture content and maturity of the tobacco leaves to ensure that the same quality is used in the same pack. S3, ignite, raise the dry bulb temperature to 35℃ in 4-6 hours, control the wet bulb temperature at 32-33℃, turn on the fan at low speed, and stabilize the temperature for 14 hours. S4. Raise the dry bulb temperature to 38°C at a rate of 1°C every 2 hours, and keep the wet bulb temperature at 34-35°C. Keep the fan at a low speed and maintain the temperature for 24 hours. S5. Raise the dry bulb temperature to 42°C at a rate of 1°C every 2.5 hours, and control the wet bulb temperature at 36°C. Switch the fan to high speed, open the valve of the aroma recovery device, and the emitted aroma is transported into the filter absorption material tank. Stabilize the temperature for 14 hours. S6. Raise the dry bulb temperature to 42°C at a rate of 1°C every 2.5 hours, control the wet bulb temperature at 36°C, switch the fan to high speed, open the aroma recovery device valve, and the emitted aroma is transported to the filter absorption material tank and stabilized at the temperature for 14 hours. S7. Raise the dry bulb temperature to 54°C at a rate of 1°C per 1.5 hours, control the wet bulb temperature at 38°C, keep the fan at high speed, keep the aroma recovery device valve open, and maintain the temperature for 14 hours. S8. Raise the dry bulb temperature to 68°C at a rate of 1°C per hour, control the wet bulb temperature at 40°C, switch the fan to low speed, keep the aroma recovery device valve open, and maintain the temperature for 20 hours. S9. Remove the filter material core from the aroma recovery device and obtain a volatile oil-water emulsion by distillation and dispersion; S10. Dilute the water emulsion and atomize it evenly onto the surface of the tobacco leaves after drying.

2. The tobacco leaf aroma-enhancing and softening roasting process according to claim 1, characterized in that: In step S1, the air inlet of the filter and absorbent material is connected to the dehumidification outlet of the drying room through a pipe, and a control valve is installed on the pipe to open during the color-fixing period and close during the other stages.

3. The tobacco leaf aroma-enhancing and softening roasting process according to claim 1, characterized in that: In step S2, the moisture content of the tobacco leaves is detected by oven drying or rapid moisture meter. Based on the moisture content, the tobacco leaves are divided into three categories: high moisture content tobacco leaves, medium-low moisture content tobacco leaves, and low moisture content tobacco leaves, and then processed into cigarettes and packaged separately.

4. The tobacco leaf aroma-enhancing and softening roasting process according to claim 1, characterized in that: The filter material core in step S1 is selected from one or more combinations of activated carbon fiber, porous ceramics, and polymer adsorption resin, and is used to adsorb the aroma components and volatile oil components that volatilize during the baking process.

5. The tobacco leaf aroma-enhancing and softening roasting process according to claim 1, characterized in that: The start-up time of the aroma recovery device in step S5 is synchronized with the switching of the blower to high speed. The negative pressure generated by the high-speed blower is used to transport the volatile aroma components in the drying room to the filter absorption material tank.

6. The tobacco leaf aroma-enhancing and softening roasting process according to claim 1, characterized in that: The distillation in step S9 is a steam distillation method with a distillation temperature of 100-120℃ and a distillation time of 2-4 hours. After collecting the distillate, it is allowed to stand and separate into layers, and the oil phase is taken for dispersion treatment.

7. The tobacco leaf aroma-enhancing and softening roasting process according to claim 1, characterized in that: In step S9, dispersion is achieved by mixing the distilled volatile oil with an emulsifier and water in a certain proportion, followed by high-speed shearing or high-pressure homogenization to form an oil-in-water volatile oil emulsion. The emulsifier is selected from one or more of Tween-80, Span-80, or soybean lecithin.

8. The tobacco leaf aroma-enhancing and softening roasting process according to claim 1, characterized in that: In step S10, the water emulsion is diluted 5-20 times, and the atomization is carried out by electrostatic spraying or compressed air atomization to make the emulsion evenly adhere to the surface of the tobacco leaves after drying. The atomization amount is 0.5%-3% of the weight of the tobacco leaves.

9. The tobacco leaf aroma-enhancing and softening roasting process according to claim 1, characterized in that: During the 20-hour temperature stabilization period in step S8, a short-term dehumidification operation is performed every 4-6 hours, with a dehumidification time of 5-10 minutes.

Images