A method of differentiating and screening tobacco

Abstract

The application discloses a tobacco differential screening method, which comprises the following steps: step 1, the tobacco is preliminarily screened by using a first screen with a pore size of 1.2 mm; step 2, the maximum content value of the size of the cut tobacco in three specifications of cigarettes is respectively measured, and the pore sizes of three second screens are correspondingly determined, the pore sizes of the three second screens are sequentially decreased, each second screen has a conveying area and a screening area, and the conveying area is provided with a convex structure; step 3, the three second screens determined in step 2 are connected in series, in parallel or in a stepped manner, so that the three second screens jointly form a screening mechanism; and step 4, the tobacco screened in step 1 is fed into the screening mechanism in step 3, so that the tobacco can be differentially screened through the three second screens. The tobacco differential screening method can differentially screen the cut tobacco, thereby matching the cut tobacco requirements of different specifications of cigarettes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tobacco shred screening, and in particular to a tobacco shred differential screening method. BACKGROUND

[0002] In the process of manufacturing tobacco products, people need to screen tobacco shreds before adding flavoring to the tobacco shreds, so as to screen out tobacco shreds with a diameter less than a specific size. If the tobacco shreds cannot be effectively removed, the tobacco shreds are prone to cause quality defects such as tobacco shreds clamping and empty head in the process of rolling, so that the defective products need to be reworked, thereby reducing the production efficiency of the tobacco shreds.

[0003] At present, due to the influence of the cigarette process path, equipment and cut tobacco drying method, the tobacco shred crushing condition has obvious differences. In addition, the existing cigarettes have different specifications, and the proportion of tobacco shreds in different specifications is different, so people need to differentially screen the tobacco shreds to meet the individualized needs of different specifications of tobacco shreds. However, the existing screening methods mostly use a fixed size of the diameter of the screen hole for screening, and the uniform screening diameter cannot effectively screen the tobacco shreds, and cannot achieve the effect of differential screening. SUMMARY

[0004] In view of the above problems, the present application provides a tobacco shred differential screening method, which can screen different tobacco shreds in size and differentially screen different specifications of tobacco shreds.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] A tobacco shred differential screening method comprises the following steps:

[0007] Step 1: a first screen with a pore size of 1.2 mm is used to preliminarily screen tobacco shreds;

[0008] Step 2: the maximum content value of the size of the tobacco shreds in three specifications of cigarettes is measured respectively, and the pore sizes of three second screens are determined correspondingly, the pore sizes of the three second screens are sequentially decreased, each of the second screens has a transportation area and a screening area, and the transportation area is provided with a convex structure;

[0009] Step 3: the three second screens determined in step 2 are connected in series, in parallel or in a stepped manner, so that the three second screens jointly form a screening mechanism;

[0010] Step 4: the tobacco shreds screened in step 1 are introduced into the screening mechanism in step 3, so that the tobacco shreds can be differentially screened through the three second screens.

[0011] According to the tobacco differential screening method, the following beneficial effects are achieved: the tobacco is preliminarily screened in step 1, so that the tobacco is screened from the cigarette to remove the tobacco with a diameter less than or equal to 1.2 mm, thereby achieving the effect of preliminarily screening the tobacco. Then, the size screening test is performed in step 2, so that the proportion distribution of the tobacco with different sizes in the cigarette is obtained, thereby determining the size of the second screen corresponding to the cigarette with different sizes, and finally, the three second screens are assembled into a screening mechanism in a proper connection mode, the tobacco screened in step 1 is fed into the screening mechanism, so that the required tobacco is screened through the three second screens, thereby achieving the effect of differentiating the screening according to the cigarette with different sizes, and facilitating the matching of the tobacco with different sizes to the size of the tobacco.

[0012] Further, in the step 2, at least four second screens are preset, the sizes of the holes on the second screens are sequentially decreased by 0.2 mm from 1.2 mm, and three types of cigarettes are fed into the second screens in batches, thereby determining the size of the second screen corresponding to the maximum content of the tobacco with different sizes in the cigarette.

[0013] Further, the sizes of the holes on the three second screens are 1.2 mm, 1 mm and 0.8 mm.

[0014] Further, the screening mechanism further comprises a vibrating frame, the three second screens are distributed in series on the vibrating frame, the vibrating frame is movably provided with a baffle below the second screens, the baffle is connected with a driving mechanism, and the driving mechanism can drive the baffle to move to shield the corresponding two second screens.

[0015] Further, the screening mechanism further comprises a vibrating frame, the three second screens are distributed in parallel on the vibrating frame, the baffle is correspondingly arranged below the second screens, the baffle is connected with a driving mechanism, and the driving mechanism is used to drive the baffle to rotate to open or close the corresponding second screen.

[0016] Further, the screening mechanism further comprises a frame, the three second screens are distributed in a ladder type on the frame, the frame is provided with a conveying belt capable of changing the conveying direction, one of the second screens is located above the conveying belt, and the other two second screens are located below the conveying belt, a baffle is correspondingly arranged below each second screen, the baffle is connected with a driving mechanism, and the driving mechanism is used to drive the baffle to move to open or close the corresponding second screen.

[0017] Further, the screening mechanism further comprises a collector, which is arranged at one side of the second screen, and the collector is provided with a weighing mechanism, which can weigh the tobacco collected by the collector.

[0018] Further, the conveying area and the screening area are both provided with multiple ones, and the conveying area and the screening area are alternately distributed on the second screen.

[0019] Further, the width of the second screen is 1000mm, and the widths of the conveying areas on the three second screens are sequentially decreased or increased by 50mm.

[0020] Further, the convex structure is a corrugated structure.

[0021] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, from which the singular aspects become apparent.

[0023] Figure 1 Structure schematic view of the series type embodiment of the screening mechanism of the present application;

[0024] Figure 2 Structure schematic view of the series type embodiment of the screening mechanism of the present application; Figure 1 Structure schematic view of another view of the embodiment;

[0025] Figure 3 Structure schematic view of the second screen corresponding to the high specification cigarette in the present application;

[0026] Figure 4 Structure schematic view of the second screen corresponding to the medium specification cigarette in the present application;

[0027] Figure 5 Structure schematic view of the second screen corresponding to the low specification cigarette in the present application;

[0028] Figure 6 Structure schematic view of the parallel type embodiment of the screening mechanism of the present application;

[0029] Figure 7 Structure schematic view of the parallel type embodiment of the screening mechanism of the present application; Figure 6 Structure schematic view of another view of the embodiment;

[0030] Figure 8 Structure schematic view of the step type embodiment of the screening mechanism of the present application.

[0031] In the figure: second screen 100, transport area 110, screening area 120, vibration frame 200, swing arm 210, feed chute 220, baffle 300, collector 400, collection pipeline 410, conveyor belt 500. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that the terms "inner", "front", "rear", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is two or more. Greater than, less than, more than, etc. are understood as not including the number, and above, below, etc. are understood as including the number. If the terms "first", "second" are described, they are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] Reference Figures 1 to 8 A tobacco differential screening method, comprising:

[0037] Step 1: using a first screen with a pore size of 1.2 mm to preliminarily screen the tobacco;

[0038] Step 2: respectively measuring the maximum content value of the size of the cut tobacco in three specifications of cigarettes, and correspondingly determining the pore sizes of three second screens 100, the pore sizes of the three second screens 100 are sequentially decreased, each second screen 100 has a transport area 110 and a screening area 120, and the transport area 110 is provided with a protruding structure;

[0039] Step 3: The three second screens 100 determined in step 2 are connected in series, in parallel or in a stepped manner to form a screening mechanism.

[0040] Step 4: The tobacco screened in step 1 is passed into the screening mechanism in step 3 so that the tobacco can be differentially screened through the three second screens 100.

[0041] The above tobacco differential screening method preliminarily screens the tobacco in step 1 to remove the broken tobacco with a diameter size less than or equal to 1.2 mm from the cigarette, thereby achieving the effect of preliminarily screening the tobacco. Then, the size screening test is performed in step 2 to obtain the proportional distribution of the broken tobacco size in different specifications of cigarettes, thereby determining the pore size of the second screen 100 corresponding to different specifications of cigarettes. Finally, the three second screens 100 are assembled into a screening mechanism by selecting a suitable connection mode, and the broken tobacco screened in step 1 is passed into the screening mechanism, thereby screening out the required broken tobacco through the three second screens 100, thereby achieving the effect of differentiating the screening according to different specifications of cigarettes, which is beneficial to match the demand of different specifications of tobacco for broken tobacco size.

[0042] Specifically, in the technical points of "9.2 Tobacco Flavoring" in the "Cigarette Process Specification" (ISBN 978-7-5019-8637-8) issued by the tobacco industry in 2016, it is clearly required that "the tobacco needs to be screened before flavoring to fully screen out the broken tobacco below 1.0 mm", therefore, the broken tobacco with a diameter less than or equal to 1.2 mm is preliminarily screened in step 1, which can speed up the subsequent screening efficiency of the broken tobacco. In addition, according to the cigarette brand, the cigarettes can be divided into one, two, three, four and five categories. Among them, the one and two categories are high specification cigarettes, the three and four categories are medium specification cigarettes, and the five category is low specification cigarette. There are differences in raw materials among the three specifications of cigarettes, mainly manifested as: the leaf formula of high specification cigarettes is good, the tobacco oil content is sufficient, and the tobacco processing performance is strong, so under the same processing conditions, the broken tobacco is smaller, and the broken tobacco proportion is generally smaller; the tobacco quality of medium specification cigarettes is significantly lower than that of high specification cigarettes, and the broken tobacco proportion is slightly higher than that of high specification cigarettes; the tobacco quality of low specification cigarettes is the worst, the resistance to addition is poor, and the tobacco is easy to break, so the broken tobacco proportion is generally larger. Therefore, through the test step of step 2, it is beneficial to determine the maximum proportion of the broken tobacco size in different specifications of cigarettes, thereby determining the pore size of the corresponding second screen 100, which is beneficial for people to subsequently differentially screen the tobacco through steps 3 and 4 to match the demand of different specifications of tobacco for broken tobacco size.

[0043] Further, in step 2, at least four second screens 100 are preset, the pore sizes on the plurality of second screens 100 are sequentially decreased by 0.2 mm from 1.2 mm, and three specifications of cigarettes are respectively passed through the plurality of second screens 100 in batches, so as to determine the maximum content value of the size of the cut tobacco in the three specifications of cigarettes corresponding to the pore size of the second screen 100.

[0044] Specifically, first, 10 batches of high-specification cigarettes, medium-specification cigarettes and low-specification cigarettes are selected, and the cut tobacco in different cigarettes is preliminarily screened by using a first screen with a diameter size of 1.2 mm. Then, the screened cut tobacco is passed through five second screens 100 for re-screening, so as to obtain five second screens 100 to distinguish the weight of the cut tobacco under each size and determine the corresponding proportion. See Table 1 below for details.

[0045] Table 1: Screening data of different second screens 100

[0046]

[0047]

[0048] According to the test data in Table 1, the proportion of cut tobacco with a diameter of ≤1.2 mm in low-specification cigarettes reaches 93.05%, the proportion of cut tobacco with a diameter of ≤1.0 mm in medium-specification cigarettes reaches 92.89%, and the proportion of cut tobacco with a diameter of ≤0.8 mm in high-specification cigarettes reaches 94.23%. If the screen with a pore size of 1.0 mm guided by the Cigarette Process Specification is used to screen the cut tobacco in low-specification, medium-specification and high-specification cigarettes, the proportions are 27.36%, 92.89% and 96.53% respectively, which cannot meet the requirement of matching the cut tobacco according to the corresponding specifications.

[0049] Referring to Figures 3 to 5 Further, the pore sizes on the three second screens 100 are 1.2 mm, 1 mm and 0.8 mm in sequence. Specifically, according to the tobacco crushing and screening test of cigarettes of different specifications, it is finally determined that the pore size of the second screen 100 corresponding to low-specification cigarettes is 1.2 mm, the pore size of the second screen 100 corresponding to medium-specification cigarettes is 1 mm, and the pore size of the second screen 100 corresponding to high-specification cigarettes is 0.8 mm, so as to facilitate people to differentially screen the cut tobacco through the second screens 100 with different pore sizes, and to selectively screen the cut tobacco of cigarettes of different specifications before flavoring.

[0050] Referring to Figure 1 and Figure 2Further, the screening mechanism further comprises a vibrating frame 200, the three second screens 100 are arranged in series on the vibrating frame 200, the vibrating frame 200 is movably provided with a baffle 300, the baffle 300 is located below the second screens 100, the baffle 300 is connected with a driving mechanism, and the driving mechanism can drive the baffle 300 to move to shield the corresponding two second screens 100.

[0051] Specifically, the three second screens 100 correspond to high-specification cigarettes, medium-specification cigarettes and low-specification cigarettes in turn along the vibration conveying direction of the material. When any second screen 100 needs to be used, the baffle 300 is driven by the driving mechanism to move to shield the other two second screens 100, so that only one second screen 100 plays a screening role, and the other two second screens 100 can only be used as a transportation channel, thereby the tobacco is screened by switching any second screen 100, which is conducive to adapting to the broken tobacco requirement of the corresponding specification of cigarettes and realizing the differential broken tobacco screening of different specifications of cigarettes. It can be understood that the second screen 100 is connected with a swing arm 210, the swing arm 210 is reciprocally swung by a motor, so as to drive the second screen 100 to vibrate and screen the tobacco. The driving mechanism can be a telescopic cylinder, or a gear rack driven by a motor to move the baffle 300 linearly. In addition, the vibrating frame 200 is also provided with an inclined feeding groove 220, and the feeding groove 220 is used to convey the tobacco to the second screen 100.

[0052] Referring to Figure 6 and Figure 7 Further, the screening mechanism further comprises a vibrating frame 200, the three second screens 100 are arranged in series on the vibrating frame 200, the vibrating frame 200 is movably provided with a baffle 300, the baffle 300 is located below the second screens 100, the baffle 300 is connected with a driving mechanism, and the driving mechanism can drive the baffle 300 to move to shield the corresponding two second screens 100.

[0053] Specifically, the three second screens 100 correspond to high-specification cigarettes, medium-specification cigarettes and low-specification cigarettes from left to right. When any second screen 100 needs to be used, the baffle 300 is driven to rotate by the driving mechanism to avoid the corresponding second screen 100, and then the other two second screens 100 are shielded by the corresponding baffles 300, so that only one second screen 100 plays a screening role, and the other two second screens 100 can only be used as a transport channel, thereby screening the cut tobacco by switching any second screen 100, which is conducive to adapting to the cut tobacco requirements of cigarettes of corresponding specifications and realizing differentiated cut tobacco screening of cigarettes of different specifications. It can be understood that the second screen 100 is connected with the swing arm 210, which is reciprocally swung by the motor to drive the second screen 100 to vibrate and screen the cut tobacco. The baffle 300 can be provided with two, and the driving mechanism can be a rotary cylinder or a motor, and each rotary cylinder drives a single baffle 300 to rotate, so as to achieve the effect of shielding the second screen 100 by rotating the two baffles 300. In addition, the material vibrating frame 200 is also provided with an inclined feed chute 220, which is used to deliver cut tobacco to the second screen 100.

[0054] Referring to Figure 8 Further, the screening mechanism further comprises a rack (not shown in the figure), the three second screens 100 are distributed in the rack in a stepped manner, the rack is provided with a conveying belt 500 capable of changing the transport direction, one of the second screens 100 is located above the conveying belt 500, and the other two second screens 100 are located below the conveying belt 500. Each second screen 100 is correspondingly provided below with a baffle 300, and the baffle 300 is connected with a driving mechanism, which is used to drive the baffle 300 to move to open or close the corresponding second screen 100.

[0055] Specifically, the second screen 100 above the conveying belt 500 corresponds to low-specification cigarettes, and the two second screens 100 below the conveying belt 500 correspond to medium-specification and high-specification cigarettes from left to right respectively. When the tobacco corresponding to high-specification cigarettes needs to be screened, the driving mechanism drives the baffle 300 to block the second screen 100 above, so that the second screen 100 above only forms a transportation channel, and then the tobacco falls into the conveying belt 500, which conveys the tobacco to be screened to the second screen 100 on the left, thereby selectively screening the tobacco to match the requirements of high-specification cigarettes. It can be understood that the second screen 100 is connected with the swing arm 210, which swings back and forth by the motor to drive the second screen 100 to vibrate and screen the tobacco. Similarly, when the tobacco corresponding to medium-specification or low-specification cigarettes needs to be screened, only the corresponding second screen 100 needs to be opened for screening, and the other two second screens 100 need to be closed, which will not be described in detail. The driving mechanism can be a telescopic cylinder, or a gear rack driven by a motor to move the baffle 300 linearly. In addition, the conveying belt 500 can change the transportation direction of the belt by forward and reverse rotation of the motor, which will not be described in detail. In addition, the rack is additionally provided with an output belt 600, which is used to receive the tobacco screened by the second screen 100 below the conveying belt 500, thereby facilitating the rapid collection of the corresponding tobacco.

[0056] Referring to Figure 1 and Figure 8 Further, the screening mechanism further comprises a collector 400 corresponding to one side of the second screen 100, and the collector 400 is provided with a weighing mechanism capable of weighing the tobacco collected by the collector 400, thereby collecting and weighing the tobacco rejected by each second screen 100, thereby facilitating the differential rejection of tobacco for different specifications of cigarettes. It can be understood that the collector 400 is a rectangular frame structure, and one end of the collector 400 is connected to one side of the second screen 100 through a collection pipeline 410, so that the collector 400 can collect the tobacco rejected by the second screen 100.

[0057] Referring to Figures 3 to 6, further, the transport area 110 and the screening area 120 are provided with multiple, the transport area 110 and the screening area 120 are alternately distributed in the second screen 100. Specifically, the existing screen is mostly flat screen, the flat screen can only screen the lower layer of the tobacco shred, and the flat screen is easy to block, which greatly reduces the screening efficiency of the tobacco. The transport area 110 is provided with a convex structure, which can drive the tobacco to slightly lift when vibrating, and effectively transport to the screening area 120 on the other side, thereby facilitating the thinning of the height of the tobacco accumulation, and facilitating the separation of the tobacco for screening in the screening area 120. The transport area 110 and the screening area 120 are alternately distributed, which can screen the tobacco along its transport path multiple times, and the overall screening effect of the second screen 100 is improved.

[0058] Referring to Figures 3 to 6 , further, the width of the second screen 100 is 1000mm, and the width of the transport area 110 on the three second screens 100 is sequentially decreased or increased by 50mm. Specifically, the existing screen plate is mostly 1500mm x 800mm, and the height of the tobacco accumulation is 100mm, and the height of the tobacco spread through the second screen 100 is still large. Therefore, by increasing the width of the screen and reducing the height of the tobacco to 50mm, the tobacco can be significantly thinned, which is beneficial to increase the screening effect of the second screen 100. It should be noted that according to the requirements of high, medium and low specifications of cigarettes, the width of the transport area 110 on the three second screens 100 can be set to 100mm, 150mm and 200mm respectively, thereby forming an equal difference of 50mm.

[0059] Referring to Figures 3 to 6 , further, the convex structure is a corrugated structure. Specifically, the corrugated structure can better drive the tobacco to roll in the vibration of the second screen 100, thereby driving the different size shreds to separate, and then be better screened by the screen holes of the screening area 120. Of course, in some embodiments, the convex structure can also be replaced by a wave structure, which is not described in detail.

[0060] The application selects different pore diameters of the second screen 100 according to different cigarette specifications, then selects different screening modes according to different screening requirements, and assembles the three second screens 100 in series, in parallel or in a stepped manner, and selectively screens high, medium and low cigarette specifications, so that the screening is more flexible and convenient, the screening efficiency and the utilization rate of raw materials are improved, the screening requirements of various cigarette specifications of the cigarette factory are covered, and the limitation that the original screening system is too single in screening broken tobacco is overcome. In addition, compared with the previous ordinary screen, the application can selectively screen tobacco, wherein the weight of the broken tobacco removed by each batch of high specification cigarette brand can be controlled at 30-40kg, the weight of the broken tobacco removed by each batch of medium specification cigarette brand can be controlled at 50-60kg, and the weight of the broken tobacco removed by each batch of low specification cigarette brand can be controlled at 70-80kg, so as to realize differential control of the broken tobacco screening of different specifications. In addition, through application, the amount of tobacco removed by comprehensive screening is reduced from the original 90kg / batch to about 55kg / batch, the screening efficiency is significantly improved, and the dust removal amount is also reduced from the original 1.1% to about 0.7%.

[0061] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0062] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method of differentiating tobacco shreds, characterized by, The application relates to a cigarette screening mechanism. Step 1: primary screening of tobacco shreds by using a first screen with a pore diameter of 1.2 mm; Step 2: respectively determining the maximum content values of the sizes of the tobacco shreds in three specifications of cigarettes, and correspondingly determining the pore diameters of three second screens (100), the pore diameters of the three second screens (100) are sequentially decreased, each of the second screens (100) has a conveying area (110) and a screening area (120), and the conveying area (110) is provided with a convex structure; Step 3: connecting the three second screens (100) determined in the step 2 in a way of series connection, parallel connection or ladder connection, so that the three second screens (100) jointly form a screening mechanism; Step 4: passing the tobacco shreds screened in the step 1 into the screening mechanism in the step 3, so that the tobacco shreds can be differentially screened through the three second screens (100); The screening mechanism further comprises a vibrating rack (200), the three second screens (100) are distributed in the vibrating rack (200) in a series connection mode, the vibrating rack (200) is movably provided with a baffle (300) located below the second screens (100), the baffle (300) is connected with a driving mechanism capable of driving the baffle (300) to move to shield the corresponding two second screens (100); The screening mechanism further comprises a vibrating rack (200), the three second screens (100) are distributed in the vibrating rack (200) in a parallel connection mode, the vibrating rack (200) is movably provided with a baffle (300) located below the second screens (100), the baffle (300) is connected with a driving mechanism capable of driving the baffle (300) to move to shield the corresponding two second screens (100); The screening mechanism further comprises a vibrating rack (200), the three second screens (100) are distributed in the vibrating rack (200) in a parallel connection mode, the vibrating rack (200) is movably provided with a baffle (300) located below the second screens (100), the baffle (300) is connected with a driving mechanism capable of driving the baffle (300) to move to shield the corresponding two second screens (100); 2. A method of tobacco leaf differential screening according to claim 1, characterised in that, In the step 2, at least four second screens (100) are preset, the pore diameters of the multiple second screens (100) are sequentially decreased by 0.2 mm from 1.2 mm, and the three specifications of cigarettes are respectively passed into the multiple second screens (100) in multiple batches, so as to respectively determine the maximum content values of the sizes of the tobacco shreds in the three specifications of cigarettes.

3. A method of tobacco leaf differential screening according to claim 2, characterised in that, The pore diameters of the three second screens (100) are 1.2 mm, 1 mm and 0.8 mm.

4. A method of differentiating tobacco shreds as claimed in claim 1, wherein, The screening mechanism further comprises a collector (400) corresponding to one side of the second screen (100), wherein the collector (400) is provided with a weighing mechanism capable of weighing the tobacco collected by the collector (400).

5. A method of tobacco leaf differential screening according to claim 1, wherein, A plurality of the conveying areas (110) and the screening areas (120) are provided, and the conveying areas (110) and the screening areas (120) are alternately distributed on the second screen (100).

6. A method of tobacco leaf differential screening according to claim 1, wherein, The width of the second screen (100) is 1000 mm, and the widths of the conveying areas (110) on the three second screens (100) are sequentially decreased or increased by 50 mm.

7. A method of tobacco leaf differential screening according to claim 1, wherein, The convex structure is a corrugated structure.

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