阅读说明：本技术 一种优化烟片几何形状的定型切片装置及制造工艺 (Shaping and slicing device for optimizing geometrical shape of tobacco flake and manufacturing process ) 是由 范磊 付永民 肖辉 郑晓花 吴俊萍 丁建勋 高丽君 王筱明 戈方 曹利红 高金玲 于 2019-09-19 设计创作，主要内容包括：本发明涉及一种优化烟片几何形状的定型切片装置及制造工艺,工艺加工路线由烟片松散回潮、烟片贮存、烟片增温、烟片筛分、定量喂料、均匀铺料、定型切片、切丝等工序组成；烟片几何形状优化主要由本发明开发的定型切片装置实现,主要由振动输送机、螺旋匀料辊、高速皮带、导料滑板、送料辊、定型辊、出料皮带、机壳及固定支架等组成。本技术方案通过合理优化控制烟片形状,使烟片尺寸分布符合统计概率分布,从根本上提高叶丝长度分布的均匀性、合理性；经切丝等工序处理后,过长烟丝基本得到消除,2mm～4mm烟丝比例达到80％以上,烟丝结构趋于更加均匀。(The invention relates to a shaping and slicing device for optimizing the geometric shape of tobacco flakes and a manufacturing process thereof, wherein the process processing route comprises the procedures of tobacco flake loosening and moisture regaining, tobacco flake storage, tobacco flake temperature increasing, tobacco flake screening, quantitative feeding, uniform material spreading, shaping and slicing, shredding and the like; the optimization of the geometric shape of the tobacco flakes is mainly realized by the shaping and slicing device developed by the invention, and the shaping and slicing device mainly comprises a vibrating conveyor, a spiral material homogenizing roller, a high-speed belt, a material guide sliding plate, a feeding roller, a shaping roller, a discharging belt, a shell, a fixed support and the like. According to the technical scheme, the shape of the tobacco flakes is reasonably and optimally controlled, so that the size distribution of the tobacco flakes accords with statistical probability distribution, and the uniformity and rationality of the length distribution of cut tobacco are fundamentally improved; after the processes of shredding and the like, overlong tobacco shreds are basically eliminated, the proportion of the tobacco shreds with the diameter of 2-4 mm reaches more than 80 percent, and the tobacco shred structure tends to be more uniform.)

1. The utility model provides an optimize smoked sheet geometry's design section device which characterized in that includes:

the vibrating conveyor loosens the tobacco flakes with set flow;

4-6 spiral refining rollers, each of which has the same structure and is arranged below the vibrating conveyor in parallel and rotates in the same direction; the rotating speed of the spiral refining rollers or the gap between two adjacent spiral refining rollers can be adjusted;

the high-speed belt is arranged below the spiral refining roller, is driven by a high-speed motor according to a set rotating speed, and thins the material passing through the spiral refining roller into a flat layer;

the upper end of the material guide sliding plate is arranged below the discharge end of the high-speed belt, and the lower end of the material guide sliding plate is arranged above the feeding roller;

the feeding roller and the shaping roller are a pair of roller sets and are driven by the same motor, the directions of rotation of the feeding roller and the shaping roller are opposite, and the linear speeds of the feeding roller and the shaping roller are the same; a shaping blade is fixed on the outer surface of the shaping roller;

and the discharging belt is positioned below the feeding roller and used for conveying the tobacco flakes cut by the shaping roller to the next procedure.

2. The shaping and slicing device for optimizing the geometry of tobacco flakes according to claim 1, wherein the vibrating conveyor, the spiral refining roller, the high-speed belt, the guide sliding plate, the feed roller, the shaping roller and the discharge belt are all disposed in a housing and supported by a fixing bracket.

3. The shaped slicing apparatus for optimizing the geometry of tobacco flakes according to claim 1, wherein the spiral refining roller comprises a cylindrical refining roller body, a plurality of spiral blades are arranged on the side surface of the refining roller body, and the spiral blades are uniformly arranged along the circumference of the side surface of the refining roller body at a set inclination angle.

4. The device for shaping and slicing tobacco flakes according to claim 3, wherein the spiral pieces are arranged in four rows along the side surface of the refining roller body, and are oppositely arranged in a splayed shape to spiral towards two sides by taking the axial center line of the refining roller body as an axis.

5. The device of claim 1, wherein the side surface of the feed roller is frosted.

6. The device for shaping and slicing tobacco flakes according to claim 1, wherein the shaping blades are circular ring structures surrounded by fence-like diamond-shaped blades.

7. A manufacturing process for optimizing the geometry of a tobacco flake, using the shaped slicing device of any of the above claims 1 to 6, comprising the steps of:

1) tobacco flake pretreatment process

Uniformly feeding the tobacco flakes into a loosening and moisture regaining device according to a formula for heating and humidifying treatment, so that the tobacco flakes are fully loosened, and the processing resistance of the tobacco flakes is improved; uniformly spreading the remoistened tobacco flakes into a storage cabinet in a vertically and horizontally reciprocating manner, uniformly blending the tobacco flakes with different formulas, and balancing the moisture and the temperature of the tobacco flakes;

2) procedure for screening and quantifying

Firstly, carrying out hot air heating treatment on the smoked sheets stored in the step 1) to further improve the processing resistance of the smoked sheets and stretch the smoked sheets;

secondly, carrying out multi-stage screening on the tobacco flakes subjected to temperature rise treatment, enabling the A-type tobacco flakes larger than 10mm to enter the step 3), enabling the B-type tobacco flakes larger than 3-10 mm not to pass through the step 3), mixing the B-type tobacco flakes with the tobacco flakes at the discharge end of the step 3), and enabling the C-type tobacco flakes smaller than 3mm not to enter the subsequent process;

thirdly, controlling the conveying flow of the A-type tobacco flakes to be stable through a quantitative feeding device, and entering the step 3);

3) shaping and slicing process

Uniformly spreading the A-type tobacco flakes conveyed in the step 2) into a flat layer by a vibrating conveyor, a spiral refining roller, a high-speed belt and a material guide sliding plate, and conveying the flat layer above a feeding roller; extruding and cutting the A-type tobacco sheets into a required shape through the reverse rotation of the feeding roller and the shaping roller, mixing the A-type tobacco sheets with the B-type tobacco sheets at a discharging belt, and feeding the mixture into the step 4);

4) tobacco flake prepressing and shredding process

Carrying out secondary screening treatment on the tobacco flakes in the step 3), wherein the tobacco flakes larger than 4mm are used for shredding by a shredding machine, the tobacco flakes of 2-4 mm bypass the shredding machine and are directly mixed with shredded tobacco, and the tobacco flakes smaller than 2mm are not sieved and enter the subsequent process;

and (4) pre-pressing the tobacco flakes larger than 4mm, then feeding the tobacco flakes into a tobacco cutter to cut the tobacco flakes, mixing the tobacco flakes with the tobacco flakes of 2-4 mm, and then feeding the tobacco flakes into a subsequent process.

8. The manufacturing process for optimizing the geometry of tobacco flakes according to claim 7, wherein said subsequent process steps include, but are not limited to, a cut tobacco charging process, a cut tobacco baking process, a blending process or a flavoring process.

9. The process of claim 7, wherein the side plate of the feeding bin of the tobacco cutter is of a groove structure in the tobacco cutting process.

Technical Field

The invention belongs to the technical field of tobacco processing, and particularly relates to a shaping and slicing device for optimizing the geometric shape of tobacco flakes and a manufacturing process thereof.

Background

The cigarette shredding process is a processing process for processing raw materials such as tobacco flakes and tobacco stems into tobacco shreds meeting the cigarette quality standard and cigarette rolling requirements. Changes in temperature, moisture content, shape, etc. are involved in this process; the deformation, namely cutting the tobacco flakes into cut tobacco with proper width is a key and necessary link, and other procedures are developed gradually around the key and necessary link. Therefore, in the tobacco shred manufacturing process, the tobacco shred structure is an important index, which not only directly influences the blending and flavoring uniformity of the tobacco shreds in the subsequent process, but also has obvious influence on the cigarette consumption and the rolling quality. Research shows that the optimal length of the leaf shred structure distribution is 2.00-4.75 mm, and with the increase of the tobacco shred amount larger than the length, the standard deviation of the single cigarette weight and the cigarette density is increased, and the stability is poor, which is caused by the larger fluctuation of the arrangement mode of longer tobacco shreds in the rolling process.

The current practical situation is that all cigarette enterprises generally have the problems of extremely uneven leaf shred length distribution and overhigh filament rate. The detection data show that the ratio of the leaf silks larger than 10mm accounts for about 40 percent, and the longest leaf silks can reach more than 100 mm. The overlong cut tobacco is easy to intertwine, curl and interweave with each other to form braided or agglomerated cut tobacco in the processing process, and is not easy to be uniformly mixed with other cut tobacco, so that the stability of the rolling quality is influenced, and the uniformity of actual blending of the cut tobacco with different components and different modules and the operation efficiency of cigarette equipment are directly influenced. There are differences in the stability and consistency of smoking quality for each cigarette to consumers. With the popularization and application of high-speed cigarette making machines, the problem is increasingly prominent, especially with the rapid development of special-shaped cigarettes such as thin cigarettes, medium cigarettes, short cigarettes and the like.

In order to solve the problem, patent number ZL201510281355.7 proposes a device for adjusting the size uniformity of cut tobacco, which can achieve a certain effect and effectively reduce the filament rate, but has no good control on the distribution proportion of the size of the cut tobacco. The non-uniformity of the tobacco shred size distribution ratio is mainly caused by the non-uniformity of the leaf size, and the optimal distribution of the tobacco shred size is only facilitated by the reasonable geometric shape of the tobacco flakes, but the problem cannot be solved in the prior art.

Disclosure of Invention

The invention aims to provide a shaping and slicing device for optimizing the geometric shape of tobacco flakes and a manufacturing process thereof, so as to solve the problem of non-uniform distribution proportion of tobacco shred sizes in the prior art.

The invention is realized by the following technical scheme:

a shaped slicing apparatus for optimizing smoked sheet geometry comprising:

the vibrating conveyor loosens the tobacco flakes with set flow;

4-6 spiral refining rollers, each of which has the same structure and is arranged below the vibrating conveyor in parallel and rotates in the same direction; the rotating speed of the spiral refining rollers or the gap between two adjacent spiral refining rollers can be adjusted;

the high-speed belt is arranged below the spiral refining roller, is driven by a high-speed motor according to a set rotating speed, and thins the material passing through the spiral refining roller into a flat layer;

the upper end of the material guide sliding plate is arranged below the discharge end of the high-speed belt, and the lower end of the material guide sliding plate is arranged above the feeding roller;

the feeding roller and the shaping roller are a pair of roller sets and are driven by the same motor, the directions of rotation of the feeding roller and the shaping roller are opposite, and the linear speeds of the feeding roller and the shaping roller are the same; a shaping blade is fixed on the outer surface of the shaping roller;

and the discharging belt is positioned below the feeding roller and used for conveying the tobacco flakes cut by the shaping roller to the next procedure.

The vibration conveyor, the spiral material homogenizing roller, the high-speed belt, the material guide sliding plate, the feeding roller, the shaping roller and the discharging belt are all arranged in the shell and are supported by a fixed support.

The spiral refining roller comprises a cylindrical refining roller body, a plurality of spiral pieces are arranged on the side surface of the refining roller body, and the spiral pieces are uniformly distributed according to a set inclination angle along the circumference of the side surface of the refining roller body.

The spiral pieces are arranged in four rows along the side surface of the refining roller body, the axial center line of the refining roller body is used as an axis, and every two spiral pieces are opposite and spiral towards two sides in a splayed shape.

The side surface of the feeding roller is frosted.

The shaping blade is of a circular structure surrounded by fence-shaped diamond blades.

A manufacturing process for optimizing the geometry of a smoked sheet using the shaped slicing device of any one of the above claims, comprising the steps of:

1) tobacco flake pretreatment process

Uniformly feeding the tobacco flakes into a loosening and moisture regaining device according to a formula for heating and humidifying treatment, so that the tobacco flakes are fully loosened, and the processing resistance of the tobacco flakes is improved; uniformly spreading the remoistened tobacco flakes into a storage cabinet in a vertically and horizontally reciprocating manner, uniformly blending the tobacco flakes with different formulas, and balancing the moisture and the temperature of the tobacco flakes;

2) procedure for screening and quantifying

Firstly, carrying out hot air heating treatment on the smoked sheets stored in the step 1) to further improve the processing resistance of the smoked sheets and stretch the smoked sheets;

secondly, carrying out multi-stage screening on the tobacco flakes subjected to temperature rise treatment, enabling the A-type tobacco flakes larger than 10mm to enter the next procedure, enabling the B-type tobacco flakes of 3-10 mm not to pass through the next procedure but to be mixed with the tobacco flakes at the discharge end of the next procedure, and enabling the C-type tobacco flakes smaller than 3mm not to enter the next procedure;

thirdly, controlling the conveying flow of the A-type tobacco flakes by a quantitative feeding device to keep stable, and entering the next procedure;

3) shaping and slicing process

Uniformly spreading the A-type tobacco sheets conveyed in the previous process into a flat layer by a vibrating conveyor, a spiral refining roller, a high-speed belt and a material guide sliding plate, and conveying the flat layer above a feeding roller; extruding and cutting the A-type tobacco sheets into required shapes through the reverse rotation of the feeding roller and the shaping roller, mixing the A-type tobacco sheets with the B-type tobacco sheets at a discharging belt, and feeding the mixture into the next procedure;

4) tobacco flake prepressing and shredding process

Carrying out secondary screening treatment on the tobacco flakes in the previous process, wherein the tobacco flakes larger than 4mm are used for shredding by a shredding machine, the tobacco flakes of 2-4 mm bypass the shredding machine and are directly mixed with shredded tobacco, and the tobacco flakes smaller than 2mm are not sieved and enter the subsequent process;

and (4) pre-pressing the tobacco flakes larger than 4mm, then feeding the tobacco flakes into a tobacco cutter to cut the tobacco flakes, mixing the tobacco flakes with the tobacco flakes of 2-4 mm, and then feeding the tobacco flakes into a subsequent process.

The subsequent procedures include but are not limited to a cut tobacco feeding procedure, a cut tobacco drying procedure, a proportion blending procedure or a flavoring procedure.

In the shredding process, a side plate of a feeding bin of the shredder is of a groove type structure.

The invention has the beneficial effects that:

according to the technical scheme, the shape of the tobacco flakes is reasonably and optimally controlled, so that the size distribution of the tobacco flakes accords with statistical probability distribution, and the uniformity and the reasonability of the length distribution of the cut tobacco are fundamentally improved. Through application, the proportion of the tobacco flakes larger than 25.4mm is controlled to be below 15%, the proportion of the tobacco flakes 12.7-25.4 mm reaches about 85%, the fragments smaller than 2.36mm are controlled to be below 0.5%, and the tobacco flake structures are reasonably distributed; after the processes of shredding and the like, overlong tobacco shreds are basically eliminated, the proportion of the tobacco shreds with the diameter of 2-4 mm reaches more than 80 percent, and the tobacco shred structure tends to be more uniform.

Drawings

FIG. 1 is a schematic view of a shaped slicing apparatus according to the present invention with a removable housing and a rack;

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a schematic structural view of a spiral refining roller;

fig. 4 is a schematic diagram of a diamond blade of the sizing roller.

Description of the reference numerals

1 vibrating conveyor, 2 spiral refining rollers, 21 refining roller bodies, 22 spiral sheets, 3 high-speed belts, 4 guide sliding plates, 5 feeding rollers, 6 hairbrushes, 7 setting rollers, 71 rhombic blades and 8 discharge belts.

Detailed Description

The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.

In order to realize the uniform distribution of the cut tobacco, rectangular, rhombic and oval cut tobacco slices with certain sizes are analyzed according to the principle, the proportion range of the cut tobacco is optimal after the cut tobacco is cut, and the statistical probability distribution rule is met; in addition, the problem solved in the previous process is better than that solved in the subsequent process, and the best way for solving the problem is to reasonably optimize and control the shape of the tobacco flakes, so that the uniformity and the rationality of the length distribution of the cut tobacco are fundamentally improved.

The technical scheme is realized by developing a shaping and slicing device for optimizing the geometric shape of the tobacco flakes, and in the manufacturing process, the structure of the pre-pressing unit before the shredding process is improved, so that the shredding quality is improved.

The utility model provides a design section device mainly comprises vibrating conveyor, spiral refining roller, high-speed belt, guide slide, feed roll, design roller, ejection of compact belt, casing and fixed bolster etc..

The vibration conveyor, the spiral material homogenizing roller, the high-speed belt, the material guide sliding plate, the feeding roller, the shaping roller and the discharging belt are all arranged in the shell and are supported by a fixed support.

In the technical solution and the accompanying drawings of the present application, the casing and the fixing bracket are not described and illustrated, but it should be understood that all the components described above need to be supported by the fixing bracket (including fixed support, rotational support, connection, etc.).

As shown in figure 1, the vibrating conveyor 1 is positioned above the spiral refining roller 2, and loosens the tobacco flakes after being heated and remoistened on the spiral refining roller naturally. In the embodiment, through the adjustment of the vibrating conveyor, the tobacco flakes with constant flow rate and larger than 10mm can be loosened and naturally scattered on the spiral refining roller, and the specific flow rate is set according to the output of different production lines.

As shown in fig. 2, the number of the spiral refining rollers 2 is 4-6, in this example, the number of the spiral refining rollers is 4, and each spiral refining roller has the same structure, is arranged below the vibrating conveyor in parallel and rotates clockwise in the same direction; the rotating speed of the spiral refining rollers or the gap between two adjacent spiral refining rollers can be adjusted.

The spiral refining roller 2 comprises a cylindrical refining roller body 21, a plurality of spiral pieces 22 are arranged on the side surface of the refining roller body, and the spiral pieces are uniformly distributed along the circumference of the side surface of the refining roller body according to a set inclination angle.

The spiral pieces are arranged in four rows along the side surface of the refining roller body, the axial center line of the refining roller body is used as an axis, every two spiral pieces are opposite and spiral towards two sides in a splayed mode, and materials conveyed by the vibrating conveyor are evenly spread towards two sides and scattered on a high-speed belt.

And the high-speed belt 3 is arranged below the spiral refining roller, is driven by a high-speed motor according to a set rotating speed, thins the material passing through the spiral refining roller into a flat layer, and is convenient for the next procedure to carry out shaping and slicing. In this embodiment, the high speed motor is set as desired, and the rotational speed of the drive motor for high speed of the belt is higher than the rotational speed of the other drive motors as compared to the other motors in the apparatus.

And the upper end of the material guide sliding plate 4 is arranged below the discharge end of the high-speed belt, the lower end of the material guide sliding plate is arranged above the feeding roller, and the material thrown and sent by the high-speed belt is accurately and uniformly conveyed above the feeding roller.

The feeding roller 5 and the shaping roller 7 are a pair of roller sets, are driven by the same motor and rotate reversely; the surface of the feeding roller is frosted and is connected with a motor through a belt pulley, and the feeding roller is mainly used for feeding the shaping roller and providing adhesive force; as shown in fig. 3, the shaping roller is a solid roller, and a circle of fence-shaped knife board is fixed on the surface of the shaping roller, so that blades with different shapes (such as rectangle, square, diamond, ellipse, and the like) can be customized according to different requirements; the excircle of the shaping roller has circumferential degree within a certain range so as to ensure that the clearance within a reasonable range can be ensured when the blade is contacted with the feed roller; the shaping roller is connected with the feed roller through a gear, the gap between the shaping roller and the feed roller is small, the linear velocity is consistent, the shaping roller rotates reversely, and the tobacco flakes are cut into required shapes through the extrusion of the two rollers.

And the discharging belt 8 is positioned below the feeding roller and used for conveying the tobacco flakes cut by the shaping roller to the next procedure.

The brush 6 is positioned below the feeding roller and is used for brushing off a small amount of tobacco flakes adhered to the roller and keeping the surface of the feeding roller clean.

The technological processing route of the technical scheme comprises the procedures of loosening and moisture regaining of the tobacco flakes, storage of the tobacco flakes, heating of the tobacco flakes, screening of the tobacco flakes, quantitative feeding, uniform spreading, shaping and slicing, shredding and the like. Loosening and dampening tobacco flakes, storing the tobacco flakes, heating the tobacco flakes, screening the tobacco flakes, quantitatively feeding, shredding, and extending other devices in the later process to the current industry universal devices, performing device type selection according to the cigarette process specification (2016 edition), and determining process parameters through tests; the optimization of the geometric shape of the tobacco flakes is mainly realized by the shaping slicing device developed by the invention, and the optimization and improvement are carried out on the pre-pressing unit of the shredding machine, so that the application effect is improved.

The application also provides a manufacturing process for optimizing the geometrical shape of the tobacco flakes, which uses the shaping and slicing device of any one of the above items, and comprises the following steps:

tobacco flake pretreatment procedure:

the tobacco flake loosening and conditioning device comprises two working sections of loosening and conditioning and storage, and has the technical task that tobacco flakes are uniformly fed into a loosening and conditioning device according to a formula to be subjected to temperature-increasing and humidifying treatment, so that the tobacco flakes are sufficiently loosened, and the processing resistance of the tobacco flakes is improved; and uniformly spreading the tobacco flakes in a storage cabinet in a vertically and horizontally reciprocating manner, so that the tobacco flakes with different formulas are uniformly mixed, and the moisture and the temperature of the tobacco flakes are balanced. Through optimization tests, the key parameters of the loosening and dampening process are as follows: the hot air temperature is 62 +/-2 ℃, the water content of an outlet is 19 +/-1 percent, and the outlet temperature is 55 +/-3 ℃; the tobacco flake storage environment temperature is 35 +/-2 ℃, the relative humidity is 70 +/-3%, and the storage time is 2.5-16 hours; at the moment, the tobacco flake has the best processing resistance and small fragment generation, the fragment rate is less than 0.5 percent, and the tobacco flake loose rate is more than or equal to 98 percent.

Screening and quantifying:

the tobacco flake sorting machine consists of three sections, namely tobacco flake heating, tobacco flake screening and quantitative feeding, and has the main technical task of sorting the tobacco flakes and accurately and uniformly conveying the tobacco flakes to the next procedure according to the set flow. The tobacco flake heating is to carry out hot air heating treatment on the stored tobacco flakes, and a small amount of steam can be added according to the requirement, so that the processing resistance of the tobacco flakes is further improved, and the tobacco flakes are stretched; through experimental optimization, the key parameters of tobacco flake temperature increase are as follows: the hot air temperature is 56 +/-2 ℃, the water content at the outlet is 18.5 +/-1%, the outlet temperature is 48 +/-3 ℃, the moisture discharge negative pressure is-10 mu bar, and under the combination of the parameters, the tobacco flake is fully stretched, the processing resistance is further enhanced, the stretching rate is more than 98%, and the fragment rate is less than 0.5%. The tobacco flake screening is three-stage vibration screening, the tobacco flakes larger than 10mm enter the next procedure for shaping and slicing, the tobacco flakes of 3-10 mm bypass the shaping and slicing procedure and are directly mixed with the tobacco flakes after slicing treatment, and the tobacco flakes smaller than 3mm are not mixed under the sieve. The quantitative feeding is composed of a quantitative pipe and a belt scale, the conveying flow of the tobacco flakes is controlled to be kept stable, in the embodiment, the material flow is set to be 4500kg/h, in other embodiments of the application, adjustment is carried out according to the production capacity, and the coefficient of variation of the material flow is less than 0.25%.

Shaping and slicing process

The tobacco flake forming machine consists of two sections of uniform spreading and shaping slicing, and the main process task is to process tobacco flakes into a required geometric shape. Uniformly spreading tobacco flakes larger than 10mm into flat layers by a vibration conveyor, a spiral material homogenizing roller, a high-speed belt, a material guide sliding plate and the like, and conveying the tobacco flakes above a feeding roller; the shaping and slicing process extrudes and cuts the blades into a required shape through the reverse high-speed rotation of the feeding roller and the shaping roller, and the blades are mixed with 3-10 mm tobacco flakes at the discharging belt and are fed into a shredding working section.

Pre-pressing and shredding tobacco flakes:

consists of secondary screening, tobacco flake prepressing and shredding sections. The main technical task is to compact the tobacco flakes, avoid flakes from running in the shredding process and accurately cut the tobacco flakes into tobacco shreds with certain wide bands according to the technical requirements. Secondary screening, namely vibration screening before shredding, is to carry out secondary screening treatment on the tobacco flakes after the geometric shape is optimized, avoid increasing broken tobacco and improve the shredding quality; the screening is also divided into three stages, tobacco pieces larger than 4mm enter a tobacco cutter to be cut, tobacco pieces 2-4 mm bypass the tobacco cutter to be directly mixed with cut tobacco, and the tobacco pieces smaller than 2mm are not processed under the screen. The pre-pressing unit of the filament cutter is optimized and improved as follows: the side plates of the feeding bin of the tobacco cutter are changed into groove type (the groove depth is 2mm, the width is 3mm and the distance is 3mm) from flat plates, so that tobacco sheets and the side plates are in line contact from surface to line, and the situation that the tobacco sheets are rolled due to friction action in the conveying process of the tobacco cutter after optimized setting, and the length distribution of cut tobacco leaves is influenced is avoided. Simultaneously, the parameters of the feeding system of the filament cutter are optimized as follows: the rotating speed of the feeding groove is 500 strokes/min, the knife gate pressure is 28KN, and the rotating speed of the cutter head is 450r/min, so that the height of the knife gate is stabilized, and the shredding effect and the length distribution uniformity of cut tobacco are effectively improved. The cut width was determined according to brand features, and the cut width was set to 1.0. + -. 0.1mm for the regular cigarettes and 0.8. + -. 0.1mm for the fine cigarettes.

The technical scheme does not relate to the subsequent processing procedures such as shredding, leaf shred feeding, shred drying, proportion blending, flavoring and the like, and the current industry universal equipment and parameters are used.

According to the technical scheme, the shape of the tobacco flakes is reasonably and optimally controlled, so that the size distribution of the tobacco flakes accords with statistical probability distribution, and the uniformity and the reasonability of the length distribution of the cut tobacco are fundamentally improved. Through application, the proportion of the tobacco flakes larger than 25.4mm is controlled to be below 15%, the proportion of the tobacco flakes 12.7-25.4 mm reaches about 85%, the fragments smaller than 2.36mm are controlled to be below 0.5%, and the tobacco flake structures are reasonably distributed; after the processes of shredding and the like, overlong tobacco shreds are basically eliminated, the proportion of the tobacco shreds with the diameter of 2-4 mm reaches more than 80 percent, and the tobacco shred structure tends to be more uniform.

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