A process for the selection of cut tobacco

Abstract

The present application provides a kind of tobacco leaf selection process, adopt equipment loose rehydration instead of tobacco natural rehydration, improve tobacco loose efficiency and the uniformity of leaf moisture after loosening;Through machine vision technology to identify tobacco stem, remove stem-containing tobacco leaf before artificial leaf selection, reduce the number of artificial leaf selection, reduce labor intensity;Through the low-intensity drying of selected leaf, reduce the moisture content of tobacco and improve the uniformity of tobacco moisture, provide protection for the safe storage of tobacco raw materials, at the same time, stabilize the number of selected leaves during the peak demand period, provide conditions for balanced production;Increase tobacco packing system, compress and pack dried tobacco into boxes, improve the density of tobacco packing, reduce transportation and storage costs.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cigarettes, and particularly relates to a tobacco leaf selection process. BACKGROUND

[0002] The selection of high-price cigarette leaves is an important process link for improving product quality and brand competitiveness. However, the traditional natural balancing (referring to taking out the raw tobacco leaves from a box, placing them in an environment with high temperature and high humidity (environmental temperature 30±2℃, relative humidity 70±5%), increasing the temperature of the tobacco leaves, and increasing the water absorption efficiency of the tobacco leaves, which is beneficial to reducing the difficulty of loosening the tobacco leaves and reducing the tobacco leaf crushing in the subsequent processing) and manual stem picking (referring to manually picking out the stems in the tobacco leaves and manually separating the tobacco leaves and stems to reduce the stem content in the tobacco leaves and improve the quality of the tobacco leaves) methods have problems such as low production efficiency, high energy consumption, low production capacity, and uneven moisture of the tobacco leaves. The formula tobacco leaves need to be balanced for more than 48 hours under the condition of an environmental temperature of 30℃ and a relative humidity of 70%, which not only has high energy consumption and a long processing waiting time, but also under the condition of natural balancing, the core wrapped tobacco leaves still do not absorb enough moisture, and the moisture difference between the surface tobacco leaves and the core wrapped tobacco leaves can reach more than 2%, which is poor in moisture uniformity and brings quality risks to the subsequent production. At the same time, natural humidification also causes the moisture of part of the tobacco leaves to be higher than 14%, which exceeds the upper limit of the safe storage moisture of the tobacco leaves, and causes the tobacco leaves to be mildewed during long-term storage. The standard stipulates that the storage time of the formula leaf group after manual leaf selection should not exceed 21 days. Therefore, the production plan can only be executed monthly, and the cigarette production has a situation of slack season and peak season, which causes the idle production capacity during the slack season and the insufficient production capacity during the peak season. In addition, the tobacco leaves after natural humidification are still in a non-loose state, and the manual leaf selection process needs to first manually loosen the tobacco leaves, and then perform operations such as leaf selection, stem removal, and impurity removal, so the efficiency of the manual leaf selection is only 8-10 kg / h, and the production efficiency is extremely low. With the increase of the sales of high-price cigarettes, the efficiency of the manual leaf selection has been unable to meet the demand of the production capacity of the products. Under the premise that the leaf selection personnel cannot be further increased, the operation personnel have a large labor intensity, and long-term single repetitive motion easily causes the reduction of the leaf selection quality. Therefore, it is necessary to adopt new technologies and methods to solve these problems. SUMMARY

[0003] Therefore, the present application aims to solve the technical problem by providing a tobacco leaf selection process, which can reduce the labor intensity of personnel and obtain high-quality tobacco leaves with uniform moisture.

[0004] The present application provides a tobacco leaf selection process, which comprises the following steps:

[0005] A) the sliced tobacco is loosened and rehydrated in a loosening cylinder to obtain loosened tobacco;

[0006] B) the loosened tobacco is spread thin in a 5-stage ladder high-frequency vibration trough to obtain spread-thin tobacco;

[0007] C) the spread-thin tobacco is fed into a low-intensity X-ray detection device to remove tobacco stems and stem-containing tobacco leaves, to obtain tobacco leaves;

[0008] D) the tobacco leaves are stored, screened, low-intensity dried, and pre-pressed and packaged to obtain selected sheet tobacco.

[0009] Preferably, in step A), the effective tobacco loosening rate in the loosening and rehydrating process is 85±5%.

[0010] The tobacco leaves that are not completely loosened and are lumped are fed into a rolling loosening device to obtain loosened tobacco, and the final tobacco loosening rate is ≥96%.

[0011] Preferably, in step A), the slicing is performed in a three-knife four-piece manner.

[0012] Preferably, in step A), the temperature of the loosening and rehydrating is 40±5℃, the cylinder body rotation speed of the loosening cylinder is 7±0.2r / min, the water temperature is raised to 40±2℃, and air pressure air spraying is used; the moisture content of the obtained loosened tobacco is 13.0-13.8%.

[0013] Preferably, in step B), the vibration frequency of the 5-stage ladder high-frequency vibration trough is 60±5kHz.

[0014] The 5-stage ladder high-frequency vibration trough is connected by 5 stages of high-frequency vibration troughs that are gradually widened, with the front narrow and the back wide, in a trumpet shape, gradually widened, and with a height difference of 10±1cm between each stage of the vibration trough, so that the tobacco is moved forward and spread thin by vibration, and is gradually widened and spread thin after each stage of the vibration trough, to a thickness of 1-2cm in the last stage.

[0015] Preferably, in step C), the wavelength of the rays of the low-intensity X-ray detection device is 2-4nm, and the radiation intensity is ≤0.5millisievert.

[0016] Preferably, in step D), the storage temperature is 22-26℃, the relative humidity is 55%-65%, and the storage time is 2-4 hours.

[0017] The moisture content of the tobacco leaves after storage fluctuates by less than ±0.5%, and the within-batch moisture content standard deviation is less than 0.15%.

[0018] Preferably, in step D), the screening is that the cured tobacco leaves are first put into a round-hole screen with a screen hole diameter of 2 mm to screen out small tobacco fragments.

[0019] Preferably, in step D), the low-intensity drying device is a roller drying device, the roller heating medium is water, the cylinder wall temperature of the drying cylinder is raised by controlling the water temperature, hot air is used as the main drying medium, the tobacco moisture is mainly taken away by contact heat transfer, the dehydration capacity is 0.8-1.0%, the moisture content of the material before drying is generally about 12.5-13.5%, the cylinder wall temperature is controlled at 60-80℃, the hot air temperature is 100±10℃, the tobacco temperature after drying is 45±5℃, the tobacco moisture content is 12.0-13.0%, and the moisture deviation is ≤0.2%.

[0020] Preferably, the moisture content of the leaf of the selected cut tobacco is 11-13%, the tobacco temperature is 30±5℃, and the density deviation DVR in the case after packing is ≤10%.

[0021] Compared with the prior art, the present application provides a cut tobacco selection process, which comprises the following steps: A) curing the tobacco leaves after slicing through a loosening cylinder to obtain loosened tobacco leaves; B) thinning the loosened tobacco leaves through a 5-stage ladder high-frequency vibration trough to obtain thinned tobacco leaves; C) putting the thinned tobacco leaves into a low-intensity X-ray detection device to remove tobacco stems and stem-containing tobacco leaves, thereby obtaining tobacco leaves; and D) curing, screening, low-intensity drying, and pre-pressing and packing the tobacco leaves to obtain selected cut tobacco. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The present application provides a flowchart of the cut tobacco selection process. DETAILED DESCRIPTION

[0023] The present application provides a cut tobacco selection process, which comprises the following steps:

[0024] A) curing the tobacco leaves after slicing through a loosening cylinder to obtain loosened tobacco leaves;

[0025] B) the loosened tobacco is spread through a 5-stage ladder high-frequency vibration tank to obtain spread tobacco;

[0026] C) the spread tobacco is put into a low-intensity X-ray detection device to remove tobacco stems and stem-containing tobacco leaves, and obtain tobacco leaves;

[0027] D) the tobacco leaves are stored, screened, low-intensity dried, and pre-pressed and packaged to obtain selected cut tobacco.

[0028] participate Figure 1 , Figure 1 A flowchart of the cut tobacco selection process provided by the application is shown.

[0029] Firstly, the tobacco leaves are cut, specifically, the formula tobacco leaves are cut according to the formula single number after being unpacked, three knives and four pieces are adopted, and the whole bale of tobacco leaves is evenly cut, and the weight of each piece of cut tobacco leaves is 50±4 kg.

[0030] Then, the cut tobacco leaves are loosened and moisturized through a loosening cylinder, specifically, the temperature of the loosening and moisturizing is 40±5℃, the cylinder body rotating speed of the loosening cylinder is 7±0.2 r / min, the water temperature is increased to 40±2℃, and air pressure air spraying is adopted; the moisture content of the loosened tobacco leaves is 13.0-13.8%.

[0031] During the loosening and moisturizing process, the effective tobacco loosening rate is 85±5%.

[0032] The tobacco leaves that are not completely loosened and are in the form of clumps are put into a rolling loosening device to obtain loosened tobacco leaves. The size of the clumps that are not completely loosened is about (4-6) cm×(12-15) cm, and the thickness of the small pieces is 1-3 cm. The clumps of tobacco leaves are screened and removed by adopting a star roller, and the removed tobacco clumps are put into a rolling loosening device to completely loosen the tobacco leaves. The loosening and moisturizing and the removal and loosening of the clumps of tobacco leaves are repeated.

[0033] The final tobacco loosening rate is ≥96%.

[0034] The loosened tobacco leaves are put through a 5-stage ladder high-frequency vibration tank, the vibration frequency of which is 60±5 kHz, the vibration tank is connected by 5 stages of high-frequency vibration tanks that are gradually widened, the front of the vibration tank is narrow and the back is wide, the vibration tank is trumpet-shaped, is gradually widened, and there is a height difference of 10±1 cm between each stage of the vibration tank, the tobacco leaves are moved forward and spread through vibration, are gradually spread and thinned through each stage of the vibration tank, and the thickness of the tobacco leaves is thinned to 1-2 cm at the last stage.

[0035] The spread tobacco leaves are put into a low-intensity X-ray detection device to remove tobacco stems and stem-containing tobacco leaves, and obtain tobacco leaves after stems are removed.

[0036] Specifically, the tobacco leaves diluted by 5 levels of distribution enter a low-intensity X-ray detection device. The low-intensity X-ray emitting source of the device is generated by an X-ray tube instead of radioactive elements, and the intensity and direction of the X-ray can be controlled. In the present application, the wavelength of the ray is between 2-4 nanometers, the radiation intensity is 0.5 millisiemens (the safety value for human body is ≤1 millisiemens), and the ray can penetrate tobacco leaves with a stacking thickness of about 5 cm. When the X-ray beam enters the tobacco leaves, the density of the tobacco leaves is relatively small, and the absorption and scattering are relatively weak, while the density of the tobacco stems is relatively large, and the absorption and scattering are relatively strong. These X-rays of different intensities transmitted by the measured object are received by a digitized detector and converted into digital signals, and then combined into a three-dimensional image. The tobacco stems are identified by an algorithm, and the effective identification rate of the tobacco stems reaches more than 99%. Based on the intensity X-ray identification of the tobacco leaves, the tobacco stems and the tobacco leaves containing stems are removed by a positive pressure air jet system, and the leakage and misremoval rate is less than 3%. The tobacco leaves without stems directly enter a storage cabinet, and the tobacco leaves containing stems enter a manual stem picking link to separate the leaves and stems and remove the stems.

[0037] The tobacco leaves after low-intensity loosening and manual stem picking enter the storage cabinet. The tobacco leaves are uniformly laid by reciprocating distribution, so that the formula is further mixed, the mixing uniformity of the formula leaf group is improved, the storage environment temperature of the tobacco leaves is 22-26℃, the relative humidity of the environment is 55%-65%, the storage time is 2-4 hours, the moisture of the tobacco leaves is more uniform through storage and balance, the moisture fluctuation within the batch is less than ±0.5%, and the within-batch moisture standard deviation is less than 0.15%, which is more beneficial to subsequent processing.

[0038] After storage, the tobacco leaves first enter a round-hole screen with a screen hole diameter of 2 mm to screen out small tobacco fragments. The screened tobacco leaves enter a low-intensity drying device. The device is a roller drying device, the heating medium of the roller is water, the temperature of the water is controlled to improve the temperature of the cylinder wall of the drying cylinder, hot air is used as the main drying medium, the water in the tobacco leaves is removed mainly through contact heat transfer, the dehydration capacity is 0.8-1.0%, the moisture of the material before drying is generally about 12.5-13.5%, the temperature of the cylinder wall is controlled at 60-80℃, the temperature of the hot air is 100±10℃, the temperature of the tobacco leaves after drying is 45±5℃, the moisture of the tobacco leaves is 12.0-13.0%, and the moisture deviation is ≤0.2%. The tobacco leaves after drying are flat and have no curling, and have a certain temperature, which reduces the crushing in the subsequent processing.

[0039] After drying, the tobacco leaves are subjected to metering, pre-pressing, re-weighing, packing, bundling and marking through a quantitative feeding system. The leaves are loose, the moisture content of the leaves is 11-13%, the temperature of the leaves is 30±5℃, the density deviation DVR in the case is ≤10%, the weight of a single package is 150 kg, and the mass (weight) tolerance is ±0.5 kg. When the leaves are pre-pressed by the pre-pressing machine, the height of the leaves is properly adjusted to avoid crushing, oil printing and affecting the appearance. The leaves in the case should be full and flat at the four corners, and free of empty corners and impurities. The return of the forming case is not more than 25-50 mm, and the case is complete, free of damage and pollution.

[0040] In order to further understand the present application, the tobacco leaf selection process provided by the present application is described below in combination with examples, and the protection scope of the present application is not limited by the following examples.

[0041] Example 1

[0042] I. Cutting and loosening

[0043] After the formula tobacco leaves are unpacked, they are cut according to the formula single number, and are uniformly cut by three knives and four pieces. Each piece of cut tobacco leaves is 50 kg, and is put into a loosening cylinder. The return air temperature of the loosening and moisture recovery is 40±5℃, the cylinder speed is 7±0.2 r / min, the water temperature of the lifting water supply is 40±2℃, and air pressure is used for spraying to reduce the processing strength of the loosening and moisture recovery. After loosening, the moisture content of the tobacco leaves is 13.0-13.8%, and the effective tobacco leaf loosening rate is 85%.

[0044] II. Screening and re-loosening of the clumped tobacco leaves

[0045] After loosening and moisture recovery, about 15% of the tobacco leaves are not completely loosened, and are small blocks with a size of about 6 cm×12 cm and a thickness of 1-3 cm. The star roller is used to screen and remove the clumped tobacco leaves. The removed tobacco blocks are put into a roller loosening device to completely loosen the tobacco leaves. Through the loosening and moisture recovery and the re-loosening of the clumped tobacco leaves, the comprehensive tobacco leaf loosening rate is ≥96%.

[0046] III. Five-stage tobacco leaf spreading

[0047] After loosening, the tobacco leaves pass through a five-stage ladder high-frequency vibration tank with a vibration frequency of 60±5 kHz. The vibration tank is connected by five stages of high-frequency vibration tanks with gradually widened stages. The vibration tank is narrow at the front and wide at the back, and is gradually widened. There is a height difference of 10 cm between each stage of the vibration tank. The vibration of the vibration tank makes the tobacco leaves move forward and spread. The tobacco leaves are gradually widened and spread through each vibration tank, and the thickness of the tobacco leaves is spread to 1-2 cm at the last stage, and then the tobacco leaves enter a low-intensity X-ray detection device.

[0048] IV. Low-intensity X-ray stem identification and removal

[0049] The 5 and cloth dilution tobacco enters low intensity X-ray detection equipment, the low intensity X-ray emission source of the equipment is not radioactive element but generated by X-ray tube, the intensity and direction of X-ray can be controlled, the wavelength is 2-4 nanometer, the radiation intensity is ≤0.5 millisiemens, the X-ray can penetrate 5cm or so thickness of tobacco, when the X-ray beam enters tobacco, the density of tobacco stem and leaf is relatively small, the absorption and scattering is relatively weak, while the density of tobacco stem is relatively large, the absorption and scattering is relatively strong, the different intensity X-ray transmitted by the measured object is received by a digital detector and converted into digital signal, then combined into three-dimensional image. The tobacco stem is identified by algorithm, the effective identification rate of tobacco stem is more than 99%. Based on the intensity X-ray, the tobacco stem and stem-containing tobacco are removed by the positive pressure air jet system, the leakage and misremoval rate is less than 3%, the stem-free tobacco directly enters the tobacco storage cabinet, the stem-containing tobacco enters the artificial stem picking link to separate the stem and leaf and remove the tobacco stem.

[0050] V. Tobacco storage

[0051] The tobacco after low intensity loosening and artificial stem picking enters the tobacco storage cabinet, the tobacco is uniformly laid by reciprocating distribution, the formula is further mixed, the mixing uniformity of formula leaf group is improved, the storage environment temperature of tobacco is 22-26℃, the relative humidity is 55%-65%, the storage time is 2-4 hours, through storage and balance, the moisture of tobacco is more uniform, the moisture fluctuation within batch is less than ±0.5%, the within-batch moisture standard deviation is less than 0.15%, which is more conducive to subsequent processing.

[0052] VI. Screening and low intensity drying

[0053] After storage, the tobacco first enters the round hole screen with a screen hole diameter of 2mm to screen out small tobacco fragments, then enters the low intensity drying equipment, the equipment is a roller dryer, the heating medium of the roller is water, the cylinder wall temperature is increased by water temperature control, hot air is the main drying medium, the moisture of tobacco is removed through contact heat transfer, the dehydration capacity is 0.8-1.0%, the moisture of material before drying is 12.5-13.5%, the cylinder wall temperature is controlled at 70±5℃, the hot air temperature is 100±10℃, the temperature of tobacco after drying is 45±5℃, the moisture of tobacco is 12.0-13.0%, the moisture deviation is ≤0.2%. The tobacco after drying is flat and has no curling, and has a certain temperature, which reduces the breakage in subsequent processing.

[0054] VII. Pre-pressing and packing

[0055] After drying, the tobacco leaves are fed through a constant weight feeding system, metered, pre-pressed, re-weighed, baled, tied, and labeled. The leaves are loose, the moisture content of the leaves is 11-13%, the temperature of the tobacco leaves is 30±5°C, the density deviation DVR in the box is ≤10%, the weight of a single bale is 150 kg, and the mass (weight) tolerance is ±0.5 kg. When the tobacco leaves are pre-pressed by the pre-pressing machine, in order to avoid crushing, oil printing, and affecting the appearance, the tobacco leaf rebound height should be adjusted appropriately. The tobacco leaves in the box should be full and flat at the four corners, without empty corners or impurities, etc. The rebound of the baling forming box is not more than 25-50 mm, the box body is complete, without damage or pollution.

[0056] Example 2

[0057] On the basis of Example 1, other conditions remain unchanged, only the tobacco leaf distribution method is changed from 5-level distribution thinning to conventional high-frequency vibration tank 1-level distribution, the vibration frequency is 60±5HZ, the amplitude λ is 5mm, the tobacco stem recognition is carried out in the manner of Example 1, the distribution thickness before entering the low-intensity X-ray tobacco stem recognition and removal equipment is 10-13mm, the tobacco stem recognition efficiency is reduced to 96.4%, the missed and false removal rate is 8.2%, compared with Example 1, the tobacco stem recognition efficiency is slightly reduced, but the missed and false removal rate is obviously improved.

[0058] Example 3

[0059] On the basis of Example 1, other conditions remain unchanged, only the tobacco stem recognition method is changed, the irradiation light source is adjusted from low-intensity X-ray to LED light source, the tobacco stem recognition efficiency is reduced to 74.2%, the missed and false removal rate is 26.4%, when the same piece of tobacco leaf material containing tobacco stems has the tobacco stem facing up and can be irradiated by the light source, it can be accurately recognized, when the tobacco leaf faces down, the tobacco stem cannot be effectively recognized, when two or more pieces of tobacco leaf material overlap, the tobacco leaf material with tobacco stems that is shielded also cannot be effectively recognized, resulting in more missed tobacco stems, the missed and false removal rate is obviously improved.

[0060] Example 4

[0061] On the basis of Example 1, other conditions remain unchanged, only the tobacco stem recognition method is changed, the irradiation light source is adjusted from low-intensity X-ray to near-infrared light source, the tobacco stem recognition efficiency is reduced to 83.7%, the missed and false removal rate is 17.6%, when the distribution uniformity is insufficient and multiple pieces of tobacco leaf material overlap, the recognition method using the near-infrared light source has obvious limitations, part of the tobacco leaf material with tobacco stems cannot be effectively recognized, resulting in missed and false removal of tobacco stems.

[0062] The results show that:

[0063] 1. By mechanical low-strength loose instead of natural conditioning artificial loose, the tobacco pretreatment time is greatly reduced, the tobacco pretreatment time is reduced from more than 48 hours to about 2 hours, and the tobacco moisture deviation in the batch is reduced from 2% to less than 0.5%, and the tobacco moisture is controlled within 14%.

[0064] 2. By machine vision to identify and screen tobacco stem, artificial only to tobacco stem and stem-containing tobacco leaf processing, while reducing the manual loose link, artificial leaf efficiency is increased from 8-10 kg / h to 50-55 kg / h, the leaf efficiency is increased by about 5 times, under the premise of reducing 60% of the leaf selection personnel, the production capacity is increased by 1 times;

[0065] 3. By low-temperature drying, the tobacco moisture is controlled within 13%, the quality safety during storage is greatly improved, the safe storage time of tobacco after artificial leaf selection is increased from 21 days to 6 months, which provides a basic condition for scientific arrangement of production capacity, realizes balanced production, avoids 12-hour continuous production during peak period, realizes 8-hour work system normalization, and greatly reduces the labor intensity of workers.

[0066] 4. By tobacco packing, the single box loading leaf quantity is increased from 80 kg to 150 kg, the packing cost and transportation cost are reduced by half, and automatic logistics and unpacking can be used in cigarette silk processing link, which improves the automation degree of high-grade product processing and improves the production efficiency.

[0067] The above is only the preferred embodiment of the present application, it should be noted that for ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A process for the classification of cut tobacco, characterized in that, It comprises the following steps: A) The sliced tobacco is loosened and rehydrated in a loosening cylinder to obtain loosened tobacco; B) The loosened tobacco is spread thin in a 5-stage ladder high-frequency vibration tank to obtain spread-thin tobacco, and the vibration frequency of the 5-stage ladder high-frequency vibration tank is 60±5 kHz; The 5-stage ladder high-frequency vibration tank is connected by 5-stage layer-by-layer widened high-frequency vibration tanks, and the vibration tank is narrow in front and wide in back, like a horn mouth, and widens gradually, and there is a height difference of 10±1 cm between each stage of the vibration tank, so that the tobacco moves forward and spreads thin through vibration, and spreads thin gradually through each stage of the vibration tank, and the thickness of the tobacco is spread thin to 1-2 cm in the last stage; C) The spread-thin tobacco enters a low-intensity X-ray detection device to remove tobacco stems and stem-containing tobacco to obtain tobacco, and the ray wavelength of the low-intensity X-ray detection device is between 2-4 nanometers, and the radiation intensity is ≤0.5 millisiemens; D) The tobacco is stored, screened, low-intensity dried, and pre-pressed and packaged to obtain selected sheet tobacco; The low-intensity drying is drum drying, the drum heating medium is water, the drum wall temperature is raised by controlling the water temperature, hot air is used as the main drying medium, the water content of the tobacco is removed mainly by contact heat transfer, the dehydration capacity is 0.8-1.0%, the moisture content of the material before drying is 12.5-13.5%, the drum wall temperature is controlled at 60-80℃, the hot air temperature is 100±10℃, the tobacco temperature after drying is 45±5℃, the moisture content of the tobacco is 12.0-13.0%, and the moisture content deviation is ≤0.2%; The moisture content of the leaf of the selected sheet tobacco is 11-13%, the tobacco temperature is 30±5℃, and the density deviation DVR in the case after packaging is ≤10%; During the loosening and rehydrating process, the effective tobacco loosening rate is 85±5%, and the tobacco that is not completely loosened and is in the form of clumps is put into a rolling loosening device to obtain loosened tobacco, and the final tobacco loosening rate is ≥96%.

2. The process according to claim 1, characterized in that, In step A), the slicing is performed in a three-knife four-piece manner.

3. The process of claim 1, wherein, In step A), the temperature of the loosening and rehydrating is 40±5℃, the cylinder body rotation speed of the loosening cylinder is 7±0.2 r / min, the water temperature is raised to 40±2℃, and air pressure is used for spraying; the moisture content of the obtained loosened tobacco is 13.0-13.8%.

4. The process of claim 1, wherein, In step D), the storage temperature is 22-26℃, the relative humidity is 55%-65%, and the storage time is 2-4 hours; The moisture content fluctuation of the tobacco after storage is less than 0.5%, and the batch moisture content standard deviation is less than 0.15%.

5. The process of claim 1, wherein, In step D), the screening is that the stored tobacco is first put into a round-hole screen with a screen hole diameter of 2 mm.

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