CN112006318B - Threshing and redrying processing technology suitable for green and impurity-containing tobacco leaves with different degrees - Google Patents
Threshing and redrying processing technology suitable for green and impurity-containing tobacco leaves with different degrees Download PDFInfo
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Abstract
The invention discloses a threshing and redrying processing technology suitable for green and impurity-containing tobacco leaves with different degrees, and belongs to the technical field of threshing and redrying processing. The tobacco leaves are classified according to the green-containing and impurity-containing degrees, and comprise tobacco leaves without green content and impurity-containing, tobacco leaves with light green content and impurity-containing, tobacco leaves with moderate green content and impurity-containing and tobacco leaves with heavy green content and impurity-containing, and after the tobacco leaves are cast and beaten in the threshing and redrying link, the moisture content and the temperature of the tobacco leaves in each process are regulated according to different processing strengths by setting process paths of the tobacco leaves of different types. The invention provides a relatively complete and feasible treatment process by controlling threshing and redrying processing modes of tobacco leaves containing green and impurities at different degrees, avoids raw material waste caused by the tobacco leaves containing green and impurities, improves the comprehensive quality of finished tobacco strips after threshing and redrying, ensures the uniformity and stability of the quality of the tobacco strips, and improves the availability ratio of industrial raw materials.
Description
Technical Field
The invention belongs to the technical field of threshing and redrying processes, and particularly relates to a threshing and redrying processing process suitable for green and impurity-containing tobacco leaves with different degrees.
Background
At present, the domestic threshing and redrying process generally adopts four procedures of moistening leaves, separating leaves and stems, redrying and packaging. In the process mode, after the tobacco flakes are dried after the leaves and the stems are separated, the moisture content and the temperature of the tobacco flakes are specified, and the tobacco flakes are convenient to store and alcoholize.
The appearance quality of the primary flue-cured tobacco leaves is different, the phenomena of grade mixing and string formation exist, the tobacco leaves are transferred into a baking factory, under the trend of large module and homogenized formula threshing, the tobacco leaves can be separated into green-containing and impure-color tobacco leaves with different degrees after being manually selected, the green-containing and impure-color tobacco leaves are treated according to the conventional redrying processing technology, the comprehensive quality of tobacco strips is influenced, and the tobacco leaves need to be degraded and used or used as reconstituted tobacco leaves in the cigarette industry, so that the waste of the tobacco leaves is caused.
Therefore, in the threshing and redrying link, a threshing and redrying processing technology suitable for green-containing and impurity-containing tobacco leaves with different degrees is researched, the internal quality of the tobacco leaves is ensured as much as possible, a foundation is laid for reprocessing the green-containing and impurity-containing tobacco leaves, and the method has very important significance.
Disclosure of Invention
The invention aims to provide a threshing and redrying processing technology suitable for green-containing and impurity-containing tobacco leaves with different degrees, which lays a foundation for the reutilization of the green-containing and impurity-containing tobacco leaves in the threshing and redrying link for redrying and aroma-keeping and reduces the loss and resource waste caused by the disposal of the green-containing and impurity-containing tobacco leaves.
The technical scheme for realizing the purpose of the invention is as follows:
a threshing and redrying process for the tobacco leaves containing different green and impurities includes such steps as classifying the tobacco leaves into 4 classes, which are respectively the tobacco leaves without green and impurities, slightly green and impurities, moderately green and impurities and severely green and impurities, according to their appearance characteristics and the green and impurities contained in the tobacco leaves, and determining the optimal process.
(1) Detecting the green-containing and impurity-containing degrees of the tobacco leaves, namely detecting the green-containing area and impurity-containing area of a single tobacco leaf by adopting an image vision method; randomly sampling 500 pieces of tobacco leaves, detecting the green-containing area and the impurity-containing area of the tobacco leaves by the same method, and calculating the average value of the green-containing area and the impurity-containing area of the tobacco leaves of the batch as the green-containing area and the impurity-containing area of the tobacco leaves to be processed;
the green-containing area of the tobacco leaves is the ratio of the area of slightly floating green on the leaf surfaces of the tobacco leaves to the area of the whole tobacco leaves, and the impure area of the tobacco leaves is the ratio of the area of impure colors on the leaf surfaces of the tobacco leaves to the area of the whole tobacco leaves.
(2) According to the detection results of the green-containing and impurity-containing degrees of the tobacco leaves, the tobacco leaves are classified into 4 types:
the first type: green-free and impurity-containing tobacco leaves: the tobacco leaves are positive and full in color and luster, strong in luster, uniform in chromaticity, small in color difference and free of fading, leaf veins are free of green and the tobacco flakes are free of micro-floating green, and meanwhile, the leaf surfaces are free of spots, green marks, pollution, aphid damage and uniform in chromaticity, and the tobacco flakes are free of mixed colors;
namely, the green-containing area X and the miscellaneous area Y of the tobacco respectively satisfy: x is 0 and Y is 0;
the second type: mild green-containing and miscellaneous tobacco leaves: the tobacco leaves are more positive in color and luster, full, stronger in luster, uniform in chromaticity, smaller in color difference and slightly faded in color on the appearance of the tobacco leaves, the leaf vein area is green or the slightly floating green area on the tobacco flakes is within 10.0 percent, meanwhile, a small amount of specks, green marks and slightly dark luster appear on the leaf surfaces, and the mixed color area on the tobacco flakes is within 20.0 percent;
namely, the green-containing area X and the miscellaneous area Y of the tobacco respectively satisfy: x is more than 0 and less than or equal to 10.0 percent, and Y is more than 0 and less than or equal to 20.0 percent;
in the third category: moderate green-containing and miscellaneous tobacco leaves: the tobacco leaves are under-bright and under-full in color and luster, under-uniform in chromaticity, large in color difference and slightly faded, the leaf veins are green or the slightly floating green area on the tobacco leaves is 10.0-30.0%, meanwhile, the periphery of the main veins of the tobacco leaves is locally blackened, irregular red patches appear on the leaf surfaces, the leaf surfaces are different in color depth and dark in luster, and the mixed color area on the tobacco leaves is 20.0-30.0%;
namely, the green-containing area X and the miscellaneous area Y of the tobacco respectively satisfy: x is more than 10.0 percent and less than or equal to 30.0 percent, Y is more than 20.0 percent and less than or equal to 30.0 percent;
the fourth type: the method comprises the following steps of (1) severely containing green and miscellaneous tobacco leaves: the tobacco leaves are not regular in color and luster, poor in plumpness, dark in color and luster, poor in chromaticity uniformity, large in color difference and obvious in fading in appearance, the leaf veins are green or the area of the slightly floating green on the tobacco leaves is over 30.0%, meanwhile, the large area around the main veins of the tobacco leaves is blackened, and has scab black spots, the surfaces of the leaves are dark red or grey brown, seriously damaged by aphids, and are dark in luster, and the area of mixed colors on the tobacco leaves is over 30.0%.
Namely, the green-containing area X and the miscellaneous area Y of the tobacco respectively satisfy: x is more than 30.0 percent, Y is more than 30.0 percent;
(3) setting a processing technology: according to the classification results of the green-containing and impurity-containing degrees of the tobacco leaves, the threshing and redrying processing technologies of the four types of tobacco leaves are respectively set as follows,
the first type: tobacco leaves without green leaves and impurities
The second type: light green tobacco leaves containing impurities
In the third category: moderate green-containing and miscellaneous tobacco leaves
The fourth type: severe green-containing and miscellaneous tobacco leaves
The first type: tobacco leaves without green leaves and impurities
Moistening leaves: moistening the tobacco leaves with low strength, wherein the water content of the outlet tobacco leaves is 17.0 +/-0.5%, and the temperature is 56 +/-2 ℃;
leaf and stem separation: threshing at a low rotating speed, wherein the rotating speed of a first-stage threshing roller is 470rpm plus or minus 40rpm, and the rotating speed of a second-stage threshing roller is 500rpm plus or minus 40 rpm;
redrying the leaves: redrying by adopting low-temperature leaves, setting the temperature of six areas of a drying section to be constant-temperature drying by adopting parabolic arcs, setting the highest temperature of a single area of the drying section to be A, setting the temperature of the first area to the sixth area to be A- (10-12), A- (3-5), A, A- (3-5), A- (5-7) and A- (10-12), setting the temperature of the first area to the sixth area to be not higher than 70 ℃, and setting the total drying temperature of the six areas to be not higher than 385 ℃;
the second type: light green tobacco leaves containing impurities
Vacuum moisture regaining: adopting a working cycle, namely vacuumizing once and humidifying once, vacuumizing for 30S, maintaining pressure for 10S and keeping temperature for 180-240S, wherein the water content of the processed tobacco leaves is 16.0 +/-0.5 percent and the temperature is 55 +/-2 ℃;
moistening leaves: moistening the tobacco leaves with low strength, wherein the water content of the outlet tobacco leaves is 17.5 +/-0.5%, and the temperature is 58 +/-2 ℃;
leaf and stem separation: threshing at a low rotating speed, wherein the rotating speed of a first-stage threshing roller is 500rpm +/-40 rpm, and the rotating speed of a second-stage threshing roller is 520rpm +/-40 rpm;
redrying the leaves: redrying by adopting low-temperature leaves, setting the temperature of six areas of a drying section to be constant-temperature drying by adopting parabolic arcs, setting the highest temperature of a single area of the drying section to be B, setting the temperature of the first area to the sixth area to be B- (11-13), B- (4-6), B, B- (4-6), B- (6-8) and B- (11-13), wherein B is not higher than 74 ℃, and the total drying temperature of the six areas is not higher than 390 ℃;
in the third category: moderate green-containing and miscellaneous tobacco leaves
Vacuum moisture regaining: two working cycles, namely vacuumizing twice and humidifying twice, wherein the vacuumizing time is 40S, the pressure maintaining time is 15S, the heat preservation time is 270S-360S, the water content of the processed tobacco leaves is 17.0 +/-0.5%, and the temperature is 57 +/-2 ℃;
moistening leaves: adopting medium-strength moistening, wherein the water content of the outlet tobacco leaves is 18% +/-0.5%, and the temperature is 60 +/-2 ℃;
leaf and stem separation: adopting middle-speed threshing, wherein the rotating speed of a first-stage threshing roller is 550rpm plus or minus 40rpm, and the rotating speed of a second-stage threshing roller is 580rpm plus or minus 40 rpm;
redrying the leaves: redrying by adopting medium-temperature blades, setting the temperature of six areas of a drying section to be constant-temperature drying by adopting parabolic arcs, setting the highest temperature of a single area of the drying section to be C, setting the temperature of one to six areas of drying to be C- (13-15), C- (5-7), C, C- (5-7), C- (10-12) and C- (13-15), wherein C is not higher than 78 ℃, and the total drying temperature of the six areas is not higher than 400 ℃;
the fourth type: severe green-containing and miscellaneous tobacco leaves
Vacuum moisture regaining: two working cycles, namely vacuumizing twice and humidifying twice, wherein the vacuumizing time is 45S, the pressure maintaining time is 20S, the heat preservation time is 360S-450S, the water content of the processed tobacco leaves is 18.0 +/-0.5%, and the temperature is 60 +/-2 ℃;
moistening leaves: adopting high-strength moistening, wherein the water content of the outlet tobacco leaves is 19.0 +/-0.5%, and the temperature is 63 +/-2 ℃;
leaf and stem separation: high-speed threshing is adopted, the rotating speed of a first-stage threshing roller is 580rpm plus or minus 40rpm, and the rotating speed of a second-stage threshing roller is 600rpm plus or minus 40 rpm;
redrying the leaves: the method comprises the steps of redrying by adopting high-temperature blades, setting the temperature of six zones of a drying section to be constant-temperature drying by adopting parabolic arcs, setting the highest temperature of a single zone of the drying section to be D, setting the temperature of one zone to six zones of drying to be D- (17-19), D- (6-8), D, D- (6-8), D- (12-14) and D- (17-19), setting D not higher than 81 ℃ and setting the total drying temperature of the six zones not higher than 410 ℃.
By adopting the technical scheme, the processing strength is adjusted by setting different process paths for processing according to different green and impurity containing degrees of the tobacco leaves, wherein the processing process paths and the processing strengths of four types of tobacco leaves are set as follows: firstly, the tobacco leaves without green and impurities are preferably subjected to low-strength leaf moistening, low-strength leaf-stem separation and low-temperature leaf redrying; secondly, the mild green and miscellaneous tobacco leaves are subjected to vacuum moisture regain treatment in one working period, low-strength vacuum moisture regain, low-strength leaf moistening, low-strength leaf and stem separation and low-temperature leaf redrying; thirdly, the moderate green and impurity-containing tobacco leaves are subjected to vacuum moisture regain treatment in two working periods, namely medium-strength vacuum moisture regain, medium-strength leaf moistening, medium-strength leaf and stem separation and medium-temperature leaf redrying; fourthly, the tobacco leaves with serious green and impurity content are subjected to vacuum moisture regain treatment in two working periods, the strength is increased, high-strength air moisture regain is realized, the leaves are moistened with high strength, the leaves and stems are separated with high strength, and the leaves are redried at high temperature. The invention classifies the green and impurity content of the tobacco leaves, provides a threshing and redrying processing technology of the tobacco leaves based on different appearance characteristics, provides a relatively complete and feasible control method for solving the problem of poor sensory quality of the tobacco strips on the premise of meeting the processing requirements, and improves the comprehensive quality of the finished tobacco strips after threshing and redrying.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
The tobacco leaves in the embodiment are the tobacco leaves in the middle of the Fujian production area in 2019 years.
(1) Determination of green-containing area and miscellaneous area of tobacco leaf
After the tobacco leaves are sorted, the tobacco leaves are positive and full in color and luster, strong in luster, uniform in chromaticity, small in color difference and free of fading, leaf veins are free of green, the tobacco flakes are free of slight green floating, and meanwhile, the leaf surfaces are free of spots, green marks, pollution, aphid damage and uniform in chromaticity, and the tobacco flakes are free of mixed colors.
(2) Classification of green-containing and impurity-containing degrees of tobacco leaves
According to the detection result of the tobacco leaves, the tobacco leaves are classified as the green-free and mixed tobacco leaves.
(3) Setting of technological path and processing strength of whole threshing and redrying process
According to the classification result of the green and impurity content of the tobacco leaves, the processing technological path and the processing strength of the whole tobacco leaf threshing and redrying process are as follows,
the process route is as follows:
processing strength:
moistening leaves: moistening leaves with low strength: the water content of the outlet tobacco leaves is 17.64 percent, and the temperature is 57.4 ℃;
leaf and stem separation: adopting low-strength threshing: the rotation speed of the first-stage beating roller is 480rpm, and the rotation speed of the second-stage beating roller is 530 rpm;
redrying the leaves: adopting low-temperature leaf redrying, setting the temperature of six areas of a drying section to adopt parabolic arc line constant-temperature drying, setting the maximum temperature of a single area of the drying section to be 69 ℃ and the total drying temperature of the six areas to be 382 ℃, wherein the temperature of each drying area is set as follows:
(4) evaluation of the quality of the tobacco sheet
The whole fragrance type is more obvious, the fragrance quality is better, the fragrance amount is more sufficient, the smoke is finer and smoother, the smoke has a little green miscellaneous gas, the sweet feeling is better, and the total quality grade is better.
Example 2
The tobacco leaves in the embodiment are the tobacco leaves in the middle of the Fujian production area in 2019 years.
(1) Determination of green-containing and impurity-containing areas of tobacco leaves
After the tobacco leaves are sorted, the tobacco leaves are relatively correct in color and luster, full, relatively strong in gloss, uniform in chromaticity, relatively small in color difference and slightly faded, the slightly floating green area on the tobacco flakes is 7.0%, a small amount of specks, green marks and slightly dark gloss appear on the leaf surfaces, and the mixed color area on the tobacco flakes is 15.0%;
(2) classification of green and impurity content of tobacco leaf
According to the tobacco leaf detection result, the tobacco leaves are classified into mild green-containing and miscellaneous tobacco leaves.
(3) Setting of technological path and processing strength of whole threshing and redrying process
According to the classification result of the green and impurity content of the tobacco leaves, the processing technological path and the processing strength of the whole tobacco leaf threshing and redrying process are as follows,
the process route is as follows:
processing strength:
vacuum moisture regaining: the method comprises the following steps of (1) one working period, namely one time of vacuumizing and one time of humidifying, wherein the vacuumizing time is 30S, the pressure maintaining time is 10S, the heat preservation time is 180S, the moisture content of the processed tobacco leaves is 16.87%, and the temperature is 55.6 ℃;
moistening leaves: moistening the tobacco leaves with low strength, wherein the water content of the outlet tobacco leaves is 17.97%, and the temperature is 58.79 ℃;
leaf and stem separation: adopting low-strength threshing, wherein the rotation speed of a first-stage threshing roller is 505rpm, and the rotation speed of a second-stage threshing roller is 540 rpm;
redrying the leaves: adopting low-temperature leaf redrying, setting the temperature of six areas of a drying section to adopt parabolic arc line constant-temperature drying, setting the highest temperature of a single area of the drying section to be 71 ℃, and setting the total drying temperature of the six areas to be 388 ℃, wherein the temperature of each drying area is set as follows:
(4) evaluating the overall quality of the tobacco flakes:
the tobacco leaves with green and impure colors in the processing batch are treated in a series of procedures, the undesirable smell such as green and impure gases of the redried tobacco strips is basically removed, and the sensory evaluation result shows that the overall flavor style is basically maintained, the aroma quality is slightly good, the aroma quantity is sufficient, the smoke is slightly fine and smooth, the green and impure gases are emitted, the irritation is increased, the sweet feeling is moderate, and the quality grade is medium.
Example 3
The tobacco leaves in the embodiment are the tobacco leaves in the middle of the Fujian production area in 2019 years.
(1) Determination of green-containing and impurity-containing areas of tobacco leaves
After the tobacco leaves are sorted, the color and luster of the tobacco leaves on the appearance of the tobacco leaves are less positive, less full, glossy, less uniform in chroma, larger in color difference and slightly faded, the leaf veins contain green or the slightly floating green area on the tobacco leaves is 18.6%, the periphery of the main veins of the tobacco leaves is locally blackened, irregular red patches appear on the surfaces of the leaves, the colors of the leaf surfaces are different, the luster is darker, and the mixed color area on the tobacco leaves is 26.8%.
(2) Classification of green and impurity content of tobacco leaves
According to the detection result of the green-containing and impurity-containing degree of the tobacco leaves, the tobacco leaves are classified as moderate green-containing and impurity-containing tobacco leaves.
(3) Setting of technological path and processing strength of whole threshing and redrying process
According to the classification result of the green and impurity containing conditions of the tobacco leaves, the processing technological path and the processing strength of the whole tobacco leaf threshing and redrying process are as follows,
the process route is as follows:
vacuum moisture regaining: two working cycles are adopted, namely vacuumizing twice and humidifying twice, wherein the vacuumizing time is 40S, the pressure maintaining time is 15S, the heat preservation time is 300S, the moisture content of the processed tobacco leaves is 17.42%, and the temperature is 58.2 ℃;
moistening leaves: adopting high-strength moistening, wherein the water content of the outlet tobacco leaves is 18.29%, and the temperature is 60.8 ℃;
leaf and stem separation: separating leaves and stems by adopting high-strength, wherein the rotating speed of a first-stage beating roller is 560rpm, and the rotating speed of a second-stage beating roller is 590 rpm;
redrying the leaves: adopting high-temperature leaf redrying, setting the temperature of six areas of a drying section by adopting parabolic arc line constant-temperature drying, setting the highest temperature of a single area of the drying section to be 74 ℃ and the total drying temperature of the six areas to be 394 ℃, wherein the temperature of each drying area is set as follows:
(4) sensory quality evaluation of tobacco flakes
Aiming at the moderate green tobacco leaves containing impurities, after a series of treatment of various working procedures, the bad smell such as the green impurity smell of the redried tobacco leaves is basically eliminated, and the overall quality reduction degree is not obvious from the sensory evaluation result, which is mainly reflected in that the overall style is slightly weakened, the aroma quality is slightly poor, the aroma quantity is slightly less, the smoke is slightly rough, the green impurity smell is slightly irritant, the sweetness is weakened, the taste characteristic is slightly poor, and the overall quality grade is slightly poor.
Example 4
The tobacco leaves in the embodiment are the tobacco leaves in the middle of the Fujian production area in 2019 years.
(1) Determination of green-containing and impurity-containing areas of tobacco leaves
After the tobacco leaves are sorted, the tobacco leaves are not positive in color and luster, poor in plumpness, dark in color and luster, poor in chromaticity uniformity, large in color difference and obvious in fading, leaf veins are green, the slightly floating green area on the tobacco leaves is 33.0%, the large area around the main veins of the tobacco leaves is blackened, disease spot black spots are formed, the surfaces of the leaves are dark red or gray brown, the damage of aphids is serious, the gloss is dark, and the variegated area on the tobacco leaves is 35.00%.
(2) Classification of green and impurity content of tobacco leaves
According to the detection result of the green-containing and impurity-containing degree of the tobacco leaves, the tobacco leaves are classified into the tobacco leaves with severe green-containing and impurity-containing.
(3) Setting of technological path and processing strength of whole threshing and redrying process
According to the classification result of the green and impurity containing conditions of the tobacco leaves, the processing technological path and the processing strength of the whole tobacco leaf threshing and redrying process are as follows,
the process route is as follows:
processing strength:
vacuum moisture regaining: two working cycles are adopted, namely vacuumizing twice and humidifying twice, wherein the vacuumizing time is 45S, the pressure maintaining time is 20S, the heat preservation time is 400S, the moisture content of the processed tobacco leaves is 18.48%, and the temperature is 62.0 ℃;
moistening leaves: high-strength moistening is adopted, the water content of outlet tobacco leaves is 19.45%, and the temperature is 61.3 ℃;
leaf and stem separation: high-strength leaf and stem separation is adopted, the rotating speed of a first-stage beating roller is 590rpm, and the rotating speed of a second-stage beating roller is 620 rpm;
redrying the leaves: redrying by adopting high-temperature blades, setting the temperature of six areas of a drying section by adopting parabolic arc line constant-temperature drying, setting the highest temperature of a single area of the drying section to be 78 ℃ and the total drying temperature of the six areas to be 406 ℃, wherein the temperature of each drying area is set as follows:
(4) sensory quality evaluation of tobacco flakes
Aiming at the tobacco leaves with serious green and miscellaneous contents, after a series of treatment of various working procedures, the bad smell such as the green and miscellaneous gas of the redried tobacco strips is eliminated to a great extent, and the overall quality reduction degree is not obvious from the sensory evaluation result, which is mainly reflected in that the overall style is slightly weakened, the aroma quality is slightly poor, the aroma quantity is slightly less, the smoke is rough, the green and miscellaneous gas is heavier, the irritation is slightly large, the sweet feeling is weakened, the taste characteristic is integrally poor, and the overall quality grade is on the low side.
Claims (4)
1. A threshing and redrying processing technology suitable for green and miscellaneous tobacco leaves with different degrees is characterized in that: according to the green-containing area and the miscellaneous area of the tobacco leaves, the tobacco leaves are divided into 4 types, namely tobacco leaves without green and miscellaneous content, mild green and miscellaneous content, moderate green and miscellaneous content and severe green and miscellaneous content, and then the four types of tobacco leaf processing technologies are respectively determined according to the classification result;
the green-containing area of the tobacco leaves is the ratio of the area of micro-floating green on the leaf surfaces of the tobacco leaves to the area of the whole tobacco leaves, and the impurity-containing area of the tobacco leaves is the ratio of the area of impurity colors on the leaf surfaces of the tobacco leaves to the area of the whole tobacco leaves;
the detection method of the green-containing area and the impurity-containing area of the tobacco leaves comprises the following steps; firstly, detecting the green-containing area and the miscellaneous area of the single tobacco leaf by adopting an image vision method; randomly sampling 500 pieces of tobacco leaves, detecting the green-containing area and the impurity-containing area of the tobacco leaves by the same method, and calculating the average value of the green-containing area and the impurity-containing area of the tobacco leaves of the batch as the green-containing area and the impurity-containing area of the tobacco leaves to be processed;
the green-containing area X and the impurity-containing area Y of the green-free impurity-containing tobacco leaf respectively meet the following requirements: x =0, Y = 0;
the green-containing area X and the impurity-containing area Y of the mild green-containing impurity-containing tobacco leaf respectively meet the following requirements: x is more than 0 and less than or equal to 10.0 percent, and Y is more than 0 and less than or equal to 20.0 percent;
the green-containing area X and the miscellaneous area Y of the moderate green-containing miscellaneous tobacco leaf respectively satisfy the following conditions: x is more than 10.0 percent and less than or equal to 30.0 percent, Y is more than 20.0 percent and less than or equal to 30.0 percent;
the green-containing area X and the impurity-containing area Y of the severe green-containing and impurity-containing tobacco leaf respectively meet the following requirements: x is more than 30.0 percent, Y is more than 30.0 percent;
the threshing and redrying processing technology of the green-free and impurity-containing tobacco leaves comprises the following steps: moistening leaves, separating leaf stalks, and redrying leaves;
the threshing and redrying processing technology of the mild green-containing and miscellaneous tobacco leaves comprises the following steps: vacuum moisture regain, leaf moistening, leaf and stem separation and leaf redrying in one working period;
the threshing and redrying processing technology of the moderate green-containing and impurity-containing tobacco leaves comprises the following steps: vacuum moisture regaining, leaf moistening, leaf and stem separation and leaf redrying in two working cycles;
the threshing and redrying processing technology of the severe green-containing and impurity-containing tobacco leaves comprises the following steps: vacuum moisture regaining, leaf moistening, leaf and stem separation and leaf redrying in two working cycles;
the threshing and redrying processing technology of the green-free and impurity-containing tobacco leaves comprises the following specific steps:
moistening leaves: moistening the tobacco leaves with low strength, wherein the water content of the outlet tobacco leaves is 17.0 +/-0.5%, and the temperature is 56 +/-2 ℃;
leaf and stem separation: threshing at a low rotating speed, wherein the rotating speed of a first-stage threshing roller is 470rpm plus or minus 40rpm, and the rotating speed of a second-stage threshing roller is 500rpm plus or minus 40 rpm;
redrying the leaves: redrying with low-temperature leaves, setting the temperature of six zones in the drying section to be constant-temperature drying with parabolic arcs, setting the highest temperature of a single zone in the drying section to be A ℃, setting the temperature of the first zone to the sixth zone to be A ℃ minus 10 ℃, A ℃ minus 3 ℃, A ℃ minus 6 ℃, A ℃ minus 10 ℃, A ℃ being not higher than 70 ℃, and setting the total drying temperature of the six zones to be not higher than 385 ℃.
2. The threshing and redrying process suitable for the green and miscellaneous tobacco leaves with different degrees according to claim 1, which is characterized in that: the threshing and redrying processing technology of the mild green and miscellaneous tobacco leaves comprises the following specific steps:
vacuum moisture regaining: adopting a working cycle, namely vacuumizing once and humidifying once, vacuumizing for 30S, maintaining pressure for 10S and keeping temperature for 180-240S, wherein the water content of the processed tobacco leaves is 16.0 +/-0.5 percent and the temperature is 55 +/-2 ℃;
moistening leaves: moistening the tobacco leaves with low strength, wherein the water content of the outlet tobacco leaves is 17.5 +/-0.5%, and the temperature is 58 +/-2 ℃;
leaf and stem separation: threshing at a low rotating speed, wherein the rotating speed of a first-stage threshing roller is 500rpm +/-40 rpm, and the rotating speed of a second-stage threshing roller is 520rpm +/-40 rpm;
redrying the leaves: redrying with low-temperature leaves, setting the temperature of six zones in the drying section to be constant-temperature drying with parabolic arcs, setting the highest temperature of a single zone in the drying section to be B ℃, setting the temperature of the first zone to the sixth zone to be B ℃ minus 12 ℃, B ℃ minus 4 ℃, B ℃ minus 3 ℃, B ℃ minus 7 ℃, B ℃ minus 12 ℃, B ℃ is not higher than 74 ℃, and the total drying temperature of the six zones is not higher than 390 ℃.
3. The threshing and redrying process suitable for the green and miscellaneous tobacco leaves with different degrees according to claim 1, which is characterized in that: the threshing and redrying processing technology of the moderate green-containing and miscellaneous tobacco leaves comprises the following specific steps:
vacuum moisture regaining: two working cycles, namely vacuumizing twice and humidifying twice, wherein the vacuumizing time is 40S, the pressure maintaining time is 15S, the heat preservation time is 270S-360S, the water content of the processed tobacco leaves is 17.0 +/-0.5%, and the temperature is 57 +/-2 ℃;
moistening leaves: adopting medium-strength moistening, wherein the water content of the outlet tobacco leaves is 18% +/-0.5%, and the temperature is 60 +/-2 ℃;
leaf and stem separation: adopting middle-speed threshing, wherein the rotating speed of a first-stage threshing roller is 550rpm plus or minus 40rpm, and the rotating speed of a second-stage threshing roller is 580rpm plus or minus 40 rpm;
redrying the leaves: redrying with medium-temperature leaf, setting the temperature of six zones in the drying section to be constant-temperature drying with parabolic arcs, setting the highest temperature of single zone in the drying section to be C deg.C, setting the temperature of first to sixth zones from C deg.C minus 14 deg.C, C minus 5 deg.C, C minus 11 deg.C, C minus 15 deg.C, and C deg.C not higher than 78 deg.C, and setting the total drying temperature of six zones not higher than 400 deg.C.
4. The threshing and redrying process suitable for the green and miscellaneous tobacco leaves with different degrees according to claim 1, which is characterized in that: the threshing and redrying processing technology of the severe green-containing and impurity-containing tobacco leaves comprises the following specific steps:
vacuum moisture regaining: two working cycles, namely vacuumizing twice and humidifying twice, wherein the vacuumizing time is 45S, the pressure maintaining time is 20S, the heat preservation time is 360S-450S, the water content of the processed tobacco leaves is 18.0 +/-0.5%, and the temperature is 60 +/-2 ℃;
moistening leaves: adopting high-strength moistening, wherein the water content of the outlet tobacco leaves is 19.0 +/-0.5%, and the temperature is 63 +/-2 ℃;
leaf and stem separation: high-speed threshing is adopted, the rotating speed of a first-stage threshing roller is 580rpm plus or minus 40rpm, and the rotating speed of a second-stage threshing roller is 600rpm plus or minus 40 rpm;
redrying the leaves: redrying by adopting high-temperature leaves, setting the temperature of six zones of a drying section to be constant-temperature drying by adopting parabolic arcs, setting the highest temperature of a single zone of the drying section to be D ℃, setting the temperature of first to sixth zones of drying to be D ℃ minus 18 ℃, D ℃ minus 6 ℃, D ℃ minus 13 ℃, D ℃ minus 19 ℃, wherein the temperature of D ℃ is not higher than 81 ℃, and the total temperature of drying of the six zones is not higher than 410 ℃.
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