CN108552580B - Threshing moisture and redrying temperature control method based on mechanical characteristics of tobacco leaves - Google Patents
Threshing moisture and redrying temperature control method based on mechanical characteristics of tobacco leaves Download PDFInfo
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B9/00—Control of the moisture content of tobacco products, e.g. cigars, cigarettes, pipe tobacco
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/10—Roasting or cooling tobacco
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B5/00—Stripping tobacco; Treatment of stems or ribs
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Abstract
A threshing moisture and redrying temperature control method based on tobacco mechanical characteristics is characterized by comprising the following steps: firstly, measuring mechanical property indexes of shearing force, pulling force, penetrating force and leaf-stem separation strength of tobacco leaf raw materials under different tobacco leaf moisture conditions, and determining proper threshing moisture according to a detection result of the mechanical property indexes of the tobacco leaf raw materials; then adjusting the water uniformity of the tobacco leaf raw material at the second moistening outlet to be optimal by adjusting the water adding proportion of the primary hot air moistening leaves and the secondary hot air moistening leaves, the hot air temperature and other technical parameters; and finally determining the redrying temperature of the tobacco flake redrying procedure according to the threshing moisture. According to the invention, through analysis of mechanical property indexes of tobacco leaf raw materials, on the basis of meeting threshing strength, a threshing moisture and redrying temperature control method based on the mechanical property of the tobacco leaf is provided, a relatively complete and feasible control method is provided for solving the problems of overhigh large sheet rate, overlarge redrying strength and the like, and the threshing redrying processing technical level and the comprehensive quality of tobacco sheets are further improved.
Description
Technical Field
The invention belongs to the technical field of threshing and redrying processes, and particularly relates to a threshing moisture and redrying temperature control method based on tobacco leaf mechanical properties.
Background
Threshing and redrying are the technological process of producing tobacco strips by separating and redrying tobacco leaves and stems. In the leaf and stem separation process, after the tobacco leaf raw material is processed by heating and humidifying equipment such as hot air leaf moistening and the like, the mechanical property of the tobacco leaf raw material is adjusted to be optimal, and the leaf and stem separation is realized under the action of proper mechanical force of threshing equipment; in the leaf redrying process, the tobacco flakes can remove excessive moisture under the action of high temperature and airflow of a baking machine so as to meet the use requirement of the cigarette industry.
The mechanical properties of tobacco leaves mainly refer to self properties of shearing force, penetrating power, leaf-stem separation strength and the like, and are the main basis for setting threshing technical parameters. Zhang Yuhai et al analyzed the influence of the moisture content of tobacco leaves on the mechanical properties of tobacco leaves (tobacco science and technology, 2013 year 1), and the research results show that: the mechanical property indexes of the tobacco leaf, such as shearing force, penetrating force, pulling force and the like, are the largest within the range of 17-20%. Documents such as "threshing and redrying process and apparatus for tobacco" (hukai, chemical industry press) also consider "to maximize the mechanical properties of tobacco raw materials and optimize the processability of tobacco raw materials". Therefore, in the current threshing and redrying processing production, the threshing moisture is generally set to be in the range of 18-20%. The threshing moisture setting method ensures threshing loss and brings certain inadaptability to cigarette production: the large sheet rate of the tobacco sheets is too high (generally about 50 percent), so that the filament rate of a cigarette shred making link is too high, and finally the stability of the cigarette rolling quality is poor; secondly, the moisture content of the tobacco leaf raw materials at the second moistening outlet is higher, so that the redrying temperature of the leaf redrying process is too high, the fragrance of tobacco flakes is lost, and the use value of the tobacco leaf raw materials is reduced.
Disclosure of Invention
The invention aims at the technical situation, and designs a method for controlling the threshing and redrying moisture and the redrying temperature according to the change trends of the shearing force, the pulling force, the penetrating force and the leaf-stem separation strength of tobacco leaves along with the moisture content and the temperature.
The object of the invention can be achieved by the following technical measures: a tobacco leaf mechanical property-based threshing moisture and redrying temperature control method comprises the steps of firstly, measuring mechanical property indexes of tobacco leaf raw materials such as shearing force, pulling force, penetrating force and leaf-stem separation strength under different tobacco leaf moisture conditions, and determining proper threshing moisture according to the detection result of the tobacco leaf raw material mechanical property indexes; then adjusting the water uniformity of the tobacco leaf raw material at the second moistening outlet to be optimal by adjusting the water adding proportion of the primary hot air moistening leaves and the secondary hot air moistening leaves, the hot air temperature and other technical parameters; finally, determining the redrying temperature of the tobacco sheet redrying process according to the threshing moisture。
In the invention, the proportion of water added into the primary hot air leaf moistening and the secondary hot air leaf moistening is distributed between the primary hot air leaf moistening and the secondary hot air leaf moistening according to the principle that the water added in the primary hot air leaf moistening accounts for not less than 60% of the total water added in the hot air leaf moistening procedure.
The maximum redrying temperature of the tobacco flakes is not more than 75 ℃, and the moisture of the tobacco flakes after being baked is within the range of (12 +/-0.5)%.
The threshing and redrying process and the control method of the invention specifically comprise the following steps:
(1) detection of mechanical property index of tobacco leaf
The mechanical property indexes of the tobacco leaves detected mainly comprise the shearing force, the penetrating force and the pulling force of the tobacco leaves、The method comprises the following specific detection steps of 4 indexes such as leaf and stem separation strength and the like: regulating the moisture of the detected tobacco leaf raw material according to 5 tobacco leaf moisture contents such as (16 +/-0.5)%, (17 +/-0.5)%, (18 +/-0.5)%, (19 +/-0.5)%, and (20 +/-0.5)%; and measuring mechanical property indexes of the tobacco leaf raw materials with different water contents, such as shearing force, penetrating force, pulling force, leaf-stem separation strength and the like after adjustment. Wherein, the shearing force and the tensile force of the tobacco leaf are detected according to a measuring method in the tobacco literature of the influence of the moisture content on the mechanical property of the tobacco leaf (grass technology, 1 year 2013); measuring the penetration force of the tobacco leaves, namely penetrating the tobacco leaves by adopting a columnar probe with the diameter of 0.5mm, and taking the maximum force value as the detection value of the penetration force of the tobacco leaves; measuring the leaf and stem separation strength of the tobacco leaves, separating leaves and stems of a 5cm tobacco leaf sample by adopting a stretching method, and calculating the integral area of the tensile force and the measuring time as the measured value of the leaf and stem separation strength; and thirdly, under each moisture condition, the detection times of each mechanical property index are not less than 10 times, and the average value is calculated.
(2) Determination of threshing moisture
The threshing moisture is mainly determined according to the index value of the mechanical property of the tobacco leaves set in the table 1.
Under the condition of 5 tobacco leaves with moisture, the maximum detection value of any 1 index in 3 indexes of the shearing force, the pulling force and the penetrating power of the tobacco leaf raw material can not reach the set requirement in the table 1, and the threshing moisture is determined according to the following steps: determining maximum detection values of the shearing force, the pulling force and the penetrating power of the tobacco leaf raw material and corresponding moisture conditions according to detection results of the shearing force, the pulling force and the penetrating power of the tobacco leaf raw material under 5 moisture conditions; secondly, under the condition that the maximum detection values of the 3 indexes of the shearing force, the pulling force and the penetrating force correspond to consistent moisture, the moisture condition can be set as threshing moisture; thirdly, under the condition that the maximum detection values of the 3 indexes of the shearing force, the pulling force and the penetrating force correspond to inconsistent moisture, the minimum value of the moisture corresponding to the maximum detection values of the 3 indexes of the shearing force, the pulling force and the penetrating force can be set as the threshing moisture.
Under the condition of 5 tobacco leaves with moisture, the maximum detection value of any 1 index in 3 indexes of the shearing force, the pulling force and the penetrating power of the tobacco leaf raw material is larger than the set requirement in the table 1, and the threshing moisture is determined according to the following steps: firstly, in 3 indexes of shearing force, pulling force and penetrating force, the maximum detection value of 1 index is greater than the set requirement in the table 1, and the corresponding moisture condition of the index detection value which is closest to the set requirement in the table 1 can be set as threshing moisture; and 2 or 3 indexes with the maximum detection value larger than the set requirement in the table 1 are selected from 3 indexes of the shearing force, the pulling force and the penetrating force, and the minimum moisture in the corresponding moisture condition with the 2 or 3 index detection values closest to the set requirement in the table 1 can be set as the threshing moisture.
TABLE 1 set values of mechanical properties of tobacco leaf raw materials
| Shear force | Penetration force | Tension force | |
| Set value | 14.0N | 1.5N | 1.5N |
(3) Establishment of hot air leaf moistening technical parameters
According to the detection result of the leaf and stem separation strength of the tobacco leaf raw material, determining the distribution proportion of the total water addition amount in the hot air leaf moistening procedure between the primary hot air leaf moistening and the secondary hot air leaf moistening: the maximum value of the leaf-stem separation strength is more than or equal to 35N sec (the unit is the integral area of force and time, namely the product of the force and the time), and the application proportion of the total water addition amount in the primary hot-air leaf moistening step is not lower than 70%; ② the maximum value of the leaf-stem separation strength is less than 35N sec, and the application proportion of the total water addition amount in the primary hot-air leaf moistening procedure is not less than 60%.
The hot air temperature of the primary hot air tobacco moistening link of the tobacco leaf raw materials with different mechanical properties is not lower than 120 ℃; the hot air temperature of the secondary hot air leaf moistening link is not lower than 115 ℃.
(4) Establishment of tobacco flake redrying temperature
Determining the redrying temperature according to threshing moisture: firstly, threshing tobacco leaves with the moisture content less than or equal to 18.0%, and redrying the tobacco leaves at the upper part at the temperature of not higher than 75 ℃ and the tobacco leaves at the middle part and the lower part at the temperature of not higher than 70 ℃; ② the tobacco leaf raw material with threshing moisture more than 18.0 percent, and the redrying temperature is not higher than 75 ℃.
The basis of the process flow adopted by the invention is as follows:
(1) leaf water content of threshing
On the basis that the mechanical properties of the tobacco leaves meet the threshing strength, the lower threshing moisture is selected, so that the large piece rate of the tobacco pieces is reduced, and the technical support is provided for the re-drying and aroma-keeping of low-temperature slow-drying.
(2) Technical parameters of hot air leaf moistening
The water adding amount in the primary hot air tobacco moistening link is improved, the absorption time of the tobacco raw materials for applying water to the moistened tobacco is prolonged, the absorption rate and the uniformity of the tobacco raw materials in the tobacco moistening link are improved through the adjustment of the temperature of the tobacco moistening hot air, and the breaking degree of the tobacco in the threshing link is reduced.
(3) Redrying temperature
On the basis of reducing threshing moisture, the moisture content of the tobacco flakes before baking is reduced, the re-baking and aroma-keeping of low-temperature slow baking are realized, and the use value of the tobacco flakes is improved.
According to the invention, through analysis of mechanical property indexes of tobacco leaf raw materials, on the basis of meeting threshing strength, a threshing moisture and redrying temperature control method based on the mechanical property of the tobacco leaf is provided, a relatively complete and feasible control method is provided for solving the problems of overhigh large sheet rate, overlarge redrying strength and the like, and the threshing redrying processing technical level and the comprehensive quality of tobacco sheets are further improved.
Detailed Description
The invention is further described by the following specific examples, but is not limited thereto.
Example 1
The tobacco leaf raw material in this example is the lower tobacco leaf of fujiangnanping, 2016.
(1) Determination of mechanical properties of tobacco leaf raw materials
Taking out 5 parts of tobacco leaf raw materials, wherein each part of tobacco leaf raw materials is not less than 50 complete tobacco leaves, then respectively adjusting the moisture of the 5 parts of tobacco leaf raw materials to be in the moisture ranges of (16 +/-0.5)%, (17 +/-0.5)%, (18 +/-0.5)%, (19 +/-0.5)%, and (20 +/-0.5)% and detecting 4 indexes of the tobacco leaf raw materials after moisture adjustment, such as shearing force, pulling force, penetrating force, leaf-stem separation strength and the like, wherein the specific detection results are shown in table 2.
Table 2 the results of moisture control and mechanical property measurement of tobacco leaf raw material in this example
| Adjustment of moisture (%) | Measured moisture (%) | Shear force (N) | Pulling force (N) | Penetration power (N) | Strong leaf and stem separation (N sec) |
| 16±0.5 | 16.33 | 9.4 | 0.9 | 0.5 | 12.5 |
| 17±0.5 | 17.02 | 11.2 | 1.1 | 1.2 | 25.3 |
| 18±0.5 | 17.98 | 11.6 | 1.2 | 1.2 | 25.2 |
| 19±0.5 | 19.21 | 10.5 | 1.2 | 1.1 | 26.4 |
| 20±0.5 | 20.05 | 10.5 | 1.1 | 1.0 | 21.5 |
(2) Determination of threshing moisture
Under the condition of 5 moisture, the maximum detection values of the shearing force, the pulling force and the penetrating power of the tobacco leaf raw material in the embodiment do not meet the requirements in the table 1, and the maximum detection values of 3 indexes and the corresponding moisture are shown in the table 3.
As can be seen from Table 3, the measured values of the 3 indexes of shear force, tensile force and penetrating force respectively have corresponding moisture contents of 17.98%, 17.98% and 17.02%/17.98%, the minimum moisture content of the corresponding moisture contents is 17.02%, and the moisture content of the threshed lower tobacco leaves of Fujiangsanming is 17.02%
TABLE 3 maximum detection value of mechanical properties of tobacco leaf raw material and corresponding moisture in this example
| Shear force | Tension force | Penetration force | |
| Maximum detection value | 11.6 N | 1.2 N | 1.2 N |
| Corresponding moisture content | 17.98% | 17.98% | 17.02%/17.98% |
(3) Setting of hot air leaf moistening technical parameters
In this example, the maximum stem separation intensity of the tobacco raw material was 26.4 nsec and less than 35 nsec. The proportion of water applied in the primary hot air leaf moistening step of the tobacco leaf raw material in the total water added in the hot air leaf moistening procedure is set to 65%, and the temperature of hot air is set to 120 ℃; the proportion of water applied in the secondary hot air leaf moistening step to the total water added in the hot air leaf moistening step is set to be 35%, and the hot air temperature is set to be 120 ℃.
(4) Setting of redrying temperature of tobacco flakes
In this example, the threshing moisture of the tobacco leaf material was set to 17.02% (less than 18.0%), and the tobacco leaf material was the lower tobacco leaf. Therefore, the maximum redrying temperature of the tobacco leaf material was set to 70 ℃.
Example 2
The tobacco leaf raw material in this example is the tobacco leaf in the middle of schchang in he nan, the year 2016.
(1) Determination of mechanical properties of tobacco leaf raw materials
Taking out 5 parts of tobacco leaf raw materials, wherein each part of tobacco leaf raw materials is not less than 50 complete tobacco leaves, then respectively adjusting the moisture of the 5 parts of tobacco leaf raw materials to be in the moisture ranges of (16 +/-0.5)%, (17 +/-0.5)%, (18 +/-0.5)%, (19 +/-0.5)%, and (20 +/-0.5)% and detecting 4 indexes of the tobacco leaf raw materials after moisture adjustment, such as shearing force, pulling force, penetrating force, leaf-stem separation strength and the like, wherein the specific detection results are shown in Table 4.
Table 4 moisture control and mechanical Properties test results of tobacco leaf raw materials in this example
| Adjustment of moisture (%) | Measured moisture (%) | Shear force (N) | Pulling force (N) | Penetration power (N) | Strong leaf and stem separation (N sec) |
| 16±0.5 | 16.15 | 25.4 | 1.9 | 1.5 | 45.0 |
| 17±0.5 | 16.89 | 30.2 | 2.2 | 1.6 | 44.5 |
| 18±0.5 | 18.02 | 30.6 | 2.5 | 1.6 | 50.2 |
| 19±0.5 | 19.26 | 28.1 | 2.2 | 1.5 | 48.0 |
| 20±0.5 | 19.99 | 27.5 | 1.8 | 1.5 | 45.6 |
(2) Determination of threshing moisture
Under the condition of 5 moisture, the maximum detection values of the shearing force, the pulling force and the penetrating force of the tobacco leaf raw material in the embodiment all reach the requirements in the table 1, and the 3 index detection values which are closest to the requirements in the table 1 and the corresponding moisture are shown in the table 5.
As is clear from Table 5, the measured values of the 3 indexes of shearing force, tensile force and penetration force which are the closest to the requirements in Table 1 correspond to water contents of 16.15%, 19.99%, 16.15%/19.26%/19.99%, respectively, and the minimum water content of the corresponding water contents is 16.15%, and the water content of the tobacco leaf material threshing in this example is 16.15%.
TABLE 5 maximum detection value of mechanical characteristics of tobacco leaf raw material and corresponding moisture in this example
| Shear force | Tension force | Penetration force | |
| Closest test value to Table 1 | 25.4 N | 1.8 N | 1.5 N |
| Corresponding moisture content | 16.15% | 19.99% | 16.15%/19.26%/19.99% |
(3) Setting of hot air leaf moistening technical parameters
In this example, the maximum stem separation intensity of the tobacco raw material was 50.2 nsec and more than 35 nsec. In the primary hot air leaf moistening step of the tobacco leaf raw material, the proportion of water in the total water added in the hot air leaf moistening procedure is set to be 75%, and the temperature of hot air is set to be 125 ℃; the proportion of water applied in the secondary hot air leaf moistening step to the total water added in the hot air leaf moistening step is set to be 25%, and the temperature of hot air is set to be 120 ℃.
(4) Setting of redrying temperature of tobacco flakes
In this example, the threshing moisture of the tobacco leaf material was set to 16.15% (less than 18.0%), and the tobacco leaf material was middle tobacco leaf. Therefore, the maximum redrying temperature of the tobacco leaf material was set to 70 ℃.
Claims (1)
1. A threshing moisture and redrying temperature control method based on tobacco mechanical characteristics is characterized by comprising the following steps: firstly, measuring mechanical property indexes of shearing force, pulling force, penetrating force and leaf-stem separation strength of tobacco leaf raw materials under different tobacco leaf moisture conditions, and determining proper threshing moisture according to a detection result of the mechanical property indexes of the tobacco leaf raw materials; then adjusting the water adding proportion of the primary hot air tobacco moistening and the secondary hot air tobacco moistening and the technical parameters of the hot air temperature to adjust the moisture uniformity of the tobacco leaf raw material of the secondary moistening outlet to be optimal; finally, determining the redrying temperature of the tobacco slice redrying process according to the threshing moisture; the method comprises the following specific steps:
(1) detection of mechanical property index of tobacco leaf
The mechanical property indexes of the tobacco leaves detected mainly comprise the shearing force, the penetrating force and the pulling force of the tobacco leaves、The leaf and stem separation strength has 4 indexes, and the specific detection steps are as follows: regulating the moisture of the detected tobacco leaf raw material according to five tobacco leaf moisture contents of (16 +/-0.5)%, (17 +/-0.5)%, (18 +/-0.5)%, (19 +/-0.5)%, and (20 +/-0.5)%; measuring mechanical property indexes of the adjusted tobacco leaf raw materials with different moisture contents, such as shearing force, penetrating force, pulling force and leaf-stem separation strength; thirdly, under each moisture condition, the detection times of each mechanical property index are not less than 10 times, and the average value is calculated;
(2) determination of threshing moisture
The threshing moisture is mainly determined according to the mechanical property index values of the tobacco leaves set in the table 1:
under the condition of five tobacco leaves with moisture, the maximum detection value of any 1 index in 3 indexes of the shearing force, the pulling force and the penetrating power of the tobacco leaf raw material can not reach the set requirement in the table 1, and the threshing moisture is determined according to the following steps: determining maximum detection values of the shearing force, the pulling force and the penetrating power of the tobacco leaf raw material and corresponding moisture conditions according to detection results of the shearing force, the pulling force and the penetrating power of the tobacco leaf raw material under five moisture conditions; secondly, under the condition that the maximum detection values of the 3 indexes of the shearing force, the pulling force and the penetrating force correspond to consistent moisture, the moisture condition can be set as threshing moisture; thirdly, under the condition that the maximum detection values of the 3 indexes of the shearing force, the pulling force and the penetrating force correspond to inconsistent moisture, the minimum value of the moisture corresponding to the maximum detection values of the 3 indexes of the shearing force, the pulling force and the penetrating force can be set as threshing moisture;
under the condition of five tobacco leaves with moisture, the maximum detection value of any 1 index in 3 indexes of the shearing force, the pulling force and the penetrating force of the tobacco leaf raw material is larger than the set requirement in the table 1, and the threshing moisture is determined according to the following steps: firstly, in 3 indexes of shearing force, pulling force and penetrating force, the maximum detection value of 1 index is greater than the set requirement in the table 1, and the corresponding moisture condition of the index detection value which is closest to the set requirement in the table 1 can be set as threshing moisture; in the 3 indexes of shearing force, pulling force and penetrating force, 2 or 3 indexes have the maximum detection value larger than the set requirement in the table 1, and the minimum moisture in the corresponding moisture condition with the 2 or 3 index detection values which are closest to the set requirement in the table 1 can be set as threshing moisture;
TABLE 1 set values of mechanical properties of tobacco leaf raw materials
(3) Establishment of hot air leaf moistening technical parameters
Determining the water adding proportion of the primary hot air wetting and the secondary hot air wetting according to the detection result of the leaf and stem separation strength of the tobacco leaf raw material: the maximum value of the leaf-stem separation strength is more than or equal to 35N sec, and the proportion of the total water addition amount in the hot air leaf moistening procedure in the water applying ratio of the primary hot air leaf moistening procedure is not lower than 70%; ② the maximum value of the leaf-stem separation strength is less than 35N sec, the proportion of the total water addition amount in the hot air leaf moistening procedure in the water applying proportion in the primary hot air leaf moistening procedure is not less than 60%;
the hot air temperature of the primary hot air tobacco moistening link of the tobacco leaf raw materials with different mechanical properties is not lower than 120 ℃; the hot air temperature in the secondary hot air leaf moistening link is not lower than 115 ℃;
(4) establishment of tobacco flake redrying temperature
Determining the redrying temperature according to threshing moisture: firstly, threshing tobacco leaves with the moisture content less than or equal to 18.0%, and redrying the tobacco leaves at the upper part at the temperature of not higher than 75 ℃ and the tobacco leaves at the middle part and the lower part at the temperature of not higher than 70 ℃; ② the tobacco leaf raw material with threshing moisture more than 18.0 percent, and the redrying temperature is not higher than 75 ℃.
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| CN109588758A (en) * | 2018-12-27 | 2019-04-09 | 中国烟草总公司郑州烟草研究院 | A kind of smoked sheet multiple roasting temperature setting method based on tobacco leaf mechanical characteristic |
| CN110051032A (en) * | 2018-12-27 | 2019-07-26 | 中国烟草总公司郑州烟草研究院 | A kind of threshing machine based on tobacco leaf mechanical characteristic beats roller revolving speed setting method |
| CN111165856B (en) * | 2020-02-11 | 2021-10-22 | 贵州中烟工业有限责任公司 | Control method for stabilizing wrinkling rate of threshing sheet tobacco |
| CN112914143B (en) * | 2021-03-06 | 2022-04-22 | 中国烟草总公司郑州烟草研究院 | Tobacco flake redrying temperature setting method capable of displaying tobacco leaf odor type style |
| CN113282050B (en) * | 2021-04-28 | 2022-06-07 | 云南烟叶复烤有限责任公司师宗复烤厂 | Leaf-wetting control method of leaf-wetting machine, storage medium, detection device and leaf-wetting system |
| CN115669979A (en) * | 2022-11-11 | 2023-02-03 | 云南省烟草农业科学研究院 | Classification formula threshing and redrying method of cinnabar smoke |
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| CN102488306B (en) * | 2011-11-16 | 2013-05-08 | 中国烟草总公司郑州烟草研究院 | Novel threshing and redrying process based on tobacco mechanics characteristic differences |
| CN103584273B (en) * | 2013-12-04 | 2015-03-25 | 中国烟草总公司郑州烟草研究院 | Formula threshing and redrying processing technology based on features of tobacco |
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