Tobacco raw material processing method and system

Abstract

The invention discloses a tobacco raw material treatment method and system.The tobacco raw material is pretreated, the pretreatment comprises first smashing, and the tobacco raw material is subjected to first smashing to obtain a coarse material of 50-100 micrometers; performing low-temperature treatment on the coarse material to obtain a low-temperature raw material with the temperature of-5 to 0 DEG C; the low-temperature raw materials are subjected to femtosecond laser treatment, a tobacco finished product material used for preparing the tobacco sheet is obtained, the proportion of the raw materials with the particle size being 1-5 micrometers in the tobacco finished product material is larger than or equal to 98%, and the aroma component retention rate of the tobacco finished product material is larger than or equal to 95%. The femtosecond laser cold ablation technology is applied to tobacco raw material treatment, low-temperature environment treatment is combined, the heat effect problem is solved fundamentally, meanwhile, the superfine grinding effect is guaranteed, and efficiency and raw material quality are both considered.

Description

Technical Field

[0001] This patent belongs to the field of tobacco sheet preparation technology, specifically relating to a method and system for processing tobacco raw materials. Background Technology

[0002] Currently, in the field of ultrafine pulverization of tobacco sheet raw materials, traditional methods have always suffered from the difficulty of simultaneously achieving pulverization effect, raw material quality, and production efficiency, and the following problems exist: 1. Thermal effects damage raw material quality: Commonly used mechanical crushing (high-speed impact, grinding) generates a lot of frictional heat, raising the temperature of tobacco sheets to above 50°C, which directly leads to the volatilization of aroma components and decomposition of active substances in tobacco. It also increases the viscosity of raw materials, causing fine powder to agglomerate and affect subsequent sheet forming. 2. Uneven and limited particle size: Mechanical grinding makes it difficult to stably grind raw materials to below 5 μm, resulting in large fluctuations in the particle size of the finished product (2-20 μm), with coarse and fine powder mixed together, leading to uneven taste and poor combustion performance of tobacco sheets; 3. High energy consumption and complicated maintenance: Mechanical crushing equipment has a high rotation speed and severe wear, requiring frequent replacement of vulnerable parts (grinding disc, blades). Its energy consumption is more than 1.5 times that of conventional processing, resulting in high long-term operating costs.

[0003] Therefore, a new method for processing tobacco sheets is needed to solve the problems of insufficient aroma components, uneven particle size, and high energy consumption. Summary of the Invention

[0004] The purpose of this patent is to provide a method and system for processing tobacco raw materials, so as to improve the aroma of tobacco, the uniformity of particle size, and reduce energy consumption.

[0005] To solve the above-mentioned technical problems, this patent adopts the following technical solution: A method for processing tobacco raw materials includes the following steps: Step A: Pre-treat the tobacco raw materials, including the first crushing, to obtain coarse material of 50-100 μm. Step B: The crude material is subjected to low-temperature treatment to obtain a low-temperature raw material with a temperature of -5~0℃; Step C: The raw materials that have undergone low-temperature treatment are subjected to femtosecond laser treatment to obtain the finished tobacco material for preparing tobacco sheets. The proportion of particles with a diameter of 1-5 μm in the finished tobacco material is ≥98%, and the aroma component retention rate of the finished tobacco material is ≥95%.

[0006] Furthermore, in step A, the pretreatment also includes a drying process. The drying temperature is 60-65℃; The drying time is 1.0-1.5 hours. The moisture content of the raw material after drying is 6-8%.

[0007] Furthermore, in step B, the cryogenic treatment includes the step of cooling the coarse material using a mixture of liquid nitrogen and air.

[0008] Furthermore, in step C, the output wavelength of the femtosecond laser processing is 1064 nm; The pulse width for femtosecond laser processing is 50-100 femtoseconds; The pulse energy for femtosecond laser processing is 10-20 μJ; The repetition frequency of femtosecond laser processing is 1-5 kHz; The laser power for femtosecond laser processing is 50-100W.

[0009] This patent further provides a system for processing tobacco raw materials using any of the methods described above. The system includes a raw material pretreatment module, a low-temperature pulverization module, and a femtosecond laser processing module. The raw material pretreatment module is used to pretreat tobacco raw materials; The cryogenic pulverization module is used for cryogenic processing; The femtosecond laser processing module is used for femtosecond laser processing.

[0010] Furthermore, the raw material pretreatment module is connected to the cryogenic pulverizing module via a conveyor belt.

[0011] Furthermore, the raw material pretreatment module includes a screening and impurity removal device, a preliminary crusher, and a drying device; The cryogenic grinding module includes a cryogenic grinding chamber, a mixed gas pipeline, a cryogenic maintenance unit, and a temperature sensor. The mixed gas pipeline connects to the cryogenic pulverizing chamber and is used to introduce a mixed gas of liquid nitrogen and air into the cryogenic pulverizing chamber; The cryogenic maintenance unit is connected to the mixed gas pipeline and is used to adjust the ratio of liquid nitrogen to air to control the temperature of the cryogenic pulverizing chamber, so that the internal temperature of the cryogenic pulverizing chamber is stabilized at -5~0℃. The temperature sensor is located inside the cryogenic pulverizing chamber.

[0012] Furthermore, the cryogenic maintenance unit includes a liquid nitrogen supply regulating device for regulating the input amount of liquid nitrogen.

[0013] Furthermore, the femtosecond laser processing module includes a laser power sensor, a femtosecond laser emitter, a beam expander, a focusing lens, and a scanning galvanometer. The laser emitted by the femtosecond laser emitter is expanded in a beam expander, and then focused into a cryogenic pulverizing chamber by a focusing lens. A scanning galvanometer drives the laser to scan and pulverize the cryogenic raw materials in the cryogenic pulverizing chamber. The laser power sensor is located inside the cryogenic pulverizing chamber.

[0014] Furthermore, the system also includes a control module, which includes a PLC controller; The PLC controller is connected to a temperature sensor and a laser power sensor.

[0015] This patent provides a method and system for processing tobacco raw materials. It innovatively applies femtosecond laser cold ablation technology to the processing of tobacco raw materials, combined with low-temperature environment processing, to solve the problem of thermal effect from the root, while ensuring the ultra-fine pulverization effect, thus balancing efficiency and raw material quality.

[0016] Compared with the prior art, this patent has the following advantages: 1. Significantly improved raw material quality: Heatless pulverization ensures that the aroma components are retained at a rate of ≥95%, and the finished product has a particle size of 1-5 μm with uniform distribution, resulting in a purer taste for the subsequent tobacco sheets; 2. Production efficiency and cost optimization: The processing capacity of 30-80kg / h is suitable for industrial production. Energy consumption is reduced by 30% compared with traditional equipment. There are no wear and tear on vulnerable parts, maintenance costs are reduced by 70%, and the equipment investment can be recovered in a short period of time. 3. High adaptability: It can process different tobacco raw materials such as tobacco dust and tobacco stems. The working conditions can be switched by intelligently adjusting the parameters. There is no need to replace the core components, and it can be flexibly connected to the existing production line. 4. Stable and reliable operation: The entire process is automatically controlled without human intervention. It can run continuously for 24 hours without failure, and the finished product qualification rate is ≥98.5%, avoiding the problem of large particle size fluctuations in traditional equipment. Attached Figure Description

[0017] The above content of this patent and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solution.

[0018] Figure 1 This is a schematic diagram of the tobacco raw material processing system in this patent. Figure 2 This is a schematic diagram of the low-temperature pulverizing module structure in this patent; Figure 3 This is a flowchart of the tobacco raw material processing method in this patent; Figure 4 This is a schematic diagram of the molecular structure of the tobacco raw material before low-temperature treatment in this patent. Figure 5 This is a schematic diagram of the molecular structure of the tobacco raw material after low-temperature treatment in this patent. Figure 6 This is a schematic diagram of the molecular structure of tobacco raw materials after femtosecond laser treatment in this patent. Figure 7This is a schematic diagram of the molecular structure of the tobacco raw material in Comparative Example 1 after grinding and pulverizing.

[0019] The reference numerals in the attached figures are explained as follows: Low-temperature grinding chamber: 10 Cavity: 11 Insulation interlayer: 12 Mixed gas pipeline: 13 Low temperature maintenance unit: 14 Liquid nitrogen supply regulating device: 141 Temperature sensor: 15 Femtosecond laser emitter: 20 Beam expander: 30 Focusing lens: 40 Scanning galvanometer: 50 Conveyor belt: 60 Tobacco sheet raw materials: 70 Detailed Implementation

[0020] The detailed features and advantages of this patent are described below in the specific embodiments. The content is sufficient to enable any person skilled in the art to understand the technical content of this patent and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this patent.

[0021] This specification also uses several compound terms to describe devices, components, equipment, etc. that include more than one function, or to assign additional functions to a corresponding device, component, equipment, etc. Those skilled in the art will understand that such compound terms can be implemented by a single or multiple devices, components, equipment, etc., as long as they are reasonable under the interpretation rules of this patent terminology.

[0022] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following figures; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In this specification and claims, several terms will be used, and unless otherwise indicated, these terms will be defined as having the following meanings: The terms “comprising” or “having” have the same meaning as “containing”, and also include other forms of the term, such as the gerund and singular forms in English, meaning including but not limited to, and not intended to exclude, for example, other elements, components, integers or steps. All other terms used herein for special definition are intended to have the general meaning understood by one of ordinary skill in the art, in particular meaning that one of ordinary skill in the art, upon reading the claims, specification and drawings of this patent, can directly and without doubt determine how the technical solution of this patent can be implemented.

[0023] Even if there are incomplete descriptions, omissions, or ambiguities in the grammar, words, punctuation, graphics, symbols, etc. of the claims, specification, and drawings of this patent, a person skilled in the art can still arrive at the only correct understanding by reading the claims, specification, and drawings as a whole without extensive reasoning or experimentation, and effectively exclude various incorrect interpretations that are not aimed at achieving the purpose of this patent.

[0024] Those skilled in the art would first choose to read the claims, specification, and drawings of this patent to reasonably interpret the terms; secondly, they would choose to refer to the relevant definitions in other documents published by the applicant before the filing date to reasonably interpret the terms; thirdly, they would choose the references cited in this patent to reasonably interpret the terms; and finally, they would choose to combine the technical dictionaries, technical manuals, reference books, textbooks, national or industry technical standards, etc., commonly used by those skilled in the art to reasonably interpret the terms.

[0025] All references cited in this application are incorporated herein by way of quotation, to the extent that they do not contradict the disclosure herein. It will be apparent to those skilled in the art that products (apparatus, components, devices, compounds, compositions, materials, etc.) and methods (processes, steps, conditions, parameters, equipment, and test methods, equipment, etc.) not specifically described herein can be applied to the implementation of the inventions fully disclosed herein without the need for excessive experimentation. This patent is intended to cover all functional equivalents known in the art of the methods, apparatus, apparatus components, materials, processes, and techniques specifically described herein. All cited references include: The following publications are included: Marks' Standard Handbook for Mechanical Engineers (11th edition and other editions prior to this patent application date), published by McGraw-Hill, Inc.; DeGarmo's Materials and Processes in Manufacturing (13th edition and other editions prior to this patent application date), published by Wiley; Machinery's Handbook (32nd edition and other editions prior to this patent application date), published by IndustrialPress Inc.; Mechanical Design Handbook (6th edition and other editions prior to this patent application date), edited by Cheng Daxian, published by Chemical Industry Press; and Modern Mechanical Design Handbook (6th edition and other editions prior to this patent application date), edited by Wen Bangchun, published by Machinery Industry Press.

[0026] This patent will now be described with reference to the accompanying drawings, in which similar reference numerals denote similar elements. While specific structures and arrangements are discussed, it should be understood that this is done merely for illustrative purposes. Those skilled in the art will recognize that other structures and arrangements can be used without departing from the spirit and scope of this patent. It will be clear to those skilled in the art that this patent can also be used in a variety of other applications.

[0027] This patent provides a method for processing tobacco raw materials based on femtosecond laser cold ablation, including the following steps: Step A: Pre-treat the tobacco raw materials. The pre-treatment includes a first grinding process, which yields coarse material of 50-100 μm. The pre-treatment also includes a drying process. The drying temperature is 60-65℃; The drying time is 1.0-1.5 hours. The moisture content of the raw material after drying is 6-8%; Step B: The crude material is subjected to cryogenic treatment, which includes cooling the crude material with a mixture of liquid nitrogen and air to obtain a cryogenic raw material with a temperature of -5~0℃. Step C: The raw materials that have undergone low-temperature treatment are subjected to femtosecond laser treatment to obtain the finished tobacco material for preparing tobacco sheets. The proportion of particles with a diameter of 1-5 μm in the finished tobacco material is ≥98%, and the aroma component retention rate of the finished tobacco material is ≥95%. The output wavelength of the femtosecond laser processing is 1064 nm; The pulse width for femtosecond laser processing is 50-100 femtoseconds; The pulse energy for femtosecond laser processing is 10-20 μJ; The repetition frequency of femtosecond laser processing is 1-5 kHz; The laser power for femtosecond laser processing is 50-100W.

[0028] like Figure 1-3 As shown, this patent also provides a tobacco raw material processing system based on the above-mentioned tobacco raw material processing method. The system includes a raw material pretreatment module, a low-temperature pulverization module, a femtosecond laser processing module, and a control module. These units are interconnected. The tobacco sheet raw material 70 is pretreated in the raw material pretreatment module and then enters the low-temperature pulverization module. In the low-temperature pulverization module, it undergoes femtosecond laser cold ablation to achieve ultra-fine pulverization. The control module controls the process parameters, maintaining a low temperature and no heat effect throughout the process. The pulverized product is directly collected for subsequent sheet processing. The raw material pretreatment module is connected to the low-temperature pulverization module via a conveyor belt 60, which transports the tobacco sheet raw material 70 to the low-temperature pulverization module.

[0029] The raw material pretreatment module includes a screening and impurity removal device, a preliminary crusher, and a drying device.

[0030] The screening and impurity removal device is used to separate impurities in the tobacco sheet raw material 70 through a screen, and collect the impurity-removed tobacco sheet raw material 70 into the next process.

[0031] The primary pulverizer is used to perform primary pulverization (i.e., first pulverization) on the cleaned tobacco sheet raw material 70 to obtain coarse material of 50-100 μm.

[0032] Drying equipment is used to dry coarse materials at low temperatures to reduce their moisture content.

[0033] The cryogenic pulverizing module includes a cryogenic pulverizing chamber 10, a mixed gas pipeline 13, a cryogenic maintenance unit 14, and a temperature sensor 15. The coarse material is first subjected to cryogenic treatment in the cryogenic pulverizing module.

[0034] The cryogenic grinding chamber 10 is used to receive coarse materials for cryogenic processing.

[0035] The mixed gas pipeline 13 is connected to the cryogenic pulverizing chamber 10 and is used to introduce a mixture of liquid nitrogen and cryogenic air into the cryogenic pulverizing chamber 10.

[0036] The cryogenic maintenance unit 14 is connected to the mixed gas pipeline 13 and is used to adjust the ratio of liquid nitrogen to cryogenic air to control the temperature of the cryogenic pulverizing chamber 10, so that the internal temperature of the cryogenic pulverizing chamber 10 is stabilized at -5~0℃.

[0037] The cryogenic maintenance unit 14 includes a liquid nitrogen supply regulating device 141, which is used to regulate the input of liquid nitrogen and control the temperature inside the cryogenic pulverizing chamber 10.

[0038] Temperature sensor 15 is arranged inside the cryogenic grinding chamber 10 to monitor the ambient temperature of the cryogenic raw material.

[0039] The cryogenic pulverizing module also includes an insulation layer 12, which is arranged around the cavity 11 of the cryogenic pulverizing chamber 10 to reduce the heat conduction effect between the cryogenic pulverizing chamber 10 and the outside.

[0040] The femtosecond laser processing module includes a femtosecond laser emitter 20, a beam expander 30, a focusing lens 40, and a scanning galvanometer 50. When the coarse material is cooled and stabilized at -5~0℃ in the crushing chamber, the femtosecond laser processing module is activated to perform femtosecond laser processing on the low-temperature raw material.

[0041] The laser emitted by the femtosecond laser emitter 20 is expanded in the beam expander 30, and then focused onto the low-temperature raw material in the low-temperature pulverizing chamber 10 by the focusing lens 40. The scanning galvanometer 50 drives the laser scanning to perform ultrafine pulverization.

[0042] The femtosecond laser processing module also includes a laser power sensor, which is arranged inside the cryogenic crushing chamber 10 to monitor the laser power intensity emitted by the femtosecond laser emitter 20 onto the cryogenic raw material.

[0043] The control module includes a PLC controller. The control module connects to a temperature sensor 15 and a laser power sensor. Based on the temperature of the cryogenic pulverizing chamber 10 monitored by the temperature sensor 15, it adjusts the parameters of the cryogenic maintenance unit 14 to regulate the input of liquid nitrogen. Then, it adjusts the laser parameters based on the laser power intensity from the laser power sensor. Specifically, when the temperature in the pulverizing chamber is below -5°C, the PLC controller controls the liquid nitrogen supply regulating device 141 to reduce the input of liquid nitrogen and prevent further temperature drops; when the temperature in the pulverizing chamber is above -5°C, it controls the liquid nitrogen supply regulating device 141 to maintain the input of liquid nitrogen.

[0044] This patent designs a femtosecond laser cold ablation ultrafine pulverization method and supporting device. Through the core process route of "low-temperature environment construction - femtosecond laser precise ablation" and intelligent control, it achieves heatless pulverization, fully preserving the aroma components and active substances of tobacco raw materials and avoiding fine powder agglomeration. At the same time, it stably pulverizes the raw materials to 1-5μm, ensuring uniform particle size and improving the quality of tobacco sheets. In addition, because this patented system uses femtosecond laser processing, it reduces energy consumption and maintenance costs compared to traditional mechanical grinding, and achieves automated and precise control, providing a high-quality and efficient solution for the ultrafine processing of tobacco sheet raw materials.

[0045] The process flow is as follows: Pre-treatment process: Remove impurities (pebbles, fiber fragments) from the tobacco sheet raw material (tobacco dust, tobacco stems), and initially crush it to a coarse particle size of 50-100 μm. Place it in a drying device and dry it at a low temperature of 60℃ for 1 hour to reduce the moisture content to 6-8%. This prevents moisture from affecting the laser ablation effect and also reduces the formation of ice and lumps at low temperatures. At this point, the molecular structure of the tobacco sheet coarse particle is as follows: Figure 4 As shown.

[0046] Cryogenic treatment: A thermal insulation layer 12 is provided on the outer layer of the cryogenic grinding chamber 10. A mixture of liquid nitrogen and cryogenic air is introduced into it. The temperature is precisely controlled by the cryogenic maintenance unit 14 to stabilize the internal temperature of the cryogenic grinding chamber 10 at -5~0℃. The molecular structure of the resulting cryogenic raw material is as follows: Figure 5 As shown; the low-temperature pulverizing chamber 10 is equipped with a temperature sensor 15 inside the chamber 11, which provides real-time feedback of the temperature signal and is linked to the liquid nitrogen supply for adjustment, so as to avoid temperature fluctuations affecting the pulverizing effect and to create a low-temperature environment. Femtosecond laser processing parameter settings: Femtosecond laser emitter 20 output wavelength 1064 nm, pulse width 50-100 femtoseconds, pulse energy 10-20 μJ, repetition frequency 1-5kHz, laser power 50-100W. The laser power can be adjusted within the range of 50-100W for femtosecond laser cold ablation and pulverization. Focusing and scanning control: After the laser beam is expanded by the beam expander 30, it is focused onto the surface of the low-temperature raw material (focal diameter 50 μm) by the focusing lens 40. The scanning galvanometer 50 drives the laser to scan bidirectionally along the X and Y axes at a scanning speed of 50-100 mm / s, achieving omnidirectional and uniform ablation of the raw material. The molecular structure of the tobacco product after femtosecond laser treatment is as follows: Figure 6 As shown; in addition, the raw materials can also be conveyed into the low temperature pulverizing chamber 10 at a uniform speed (speed 0.1-0.3m / min) by the conveyor belt 60 to ensure that each part of the raw materials can be covered by the laser, and then conveyed out after the femtosecond laser treatment is completed. The processing capacity of the conveyor belt 60 is 30-80kg / h, and the equipment has a continuous operation stability of ≥24 hours. Intelligent control module linkage: The PLC controller is connected to the temperature sensor 15 and the laser power sensor to collect various parameters in real time; when the temperature of the low-temperature pulverizing chamber 10 is lower than -5℃, the liquid nitrogen supply is automatically reduced; the laser parameters can be preset through the touch screen to adapt to the pulverizing needs of different tobacco raw materials (tobacco dust, tobacco stems), realize one-button start / stop and fault alarm, and ensure stable pulverizing effect.

[0047] In this patent, the finished product obtained by pulverizing tobacco sheet raw material through femtosecond laser treatment has a particle size of 1-5 μm (accounting for ≥98%), an aroma component retention rate of ≥95%, no heat effect is generated, the temperature inside the cavity 11 is maintained at around -3℃, the tobacco aroma components do not volatilize, the fine powder does not agglomerate, and the finished product can be directly sent to the subsequent sheet forming process.

[0048] Comparative Example 1

[0049] This comparative example uses a grinding mill (manufacturer: China Shipbuilding Industry Corporation 715 Research Institute; model: LM1900K) to mechanically pulverize tobacco sheets to below 5 μm (≥85%) to obtain the finished product. The molecular structure of the pulverized tobacco sheet finished product is as follows: Figure 7 As shown, it can be seen that many molecular bonds in the finished tobacco product are broken, which easily increases the stickiness of the tobacco material, causes fine powder to agglomerate and clump, and leads to the volatilization of aroma components and decomposition of active substances in the tobacco, with an aroma component retention rate of only about 60%.

[0050] The terms and expressions used in this specification are for illustrative purposes and not for limitation. Their use is not intended to exclude any equivalents of the features or portions thereof shown, but rather to facilitate the understanding that various modifications may be possible within the scope of this patent claim. Therefore, it should be understood that while this patent has been specifically disclosed through preferred embodiments, exemplary embodiments, and optional features, variations or modifications of the concepts disclosed herein may be adopted by those skilled in the art, and such variations and modifications are therefore considered to be within the scope of this patent as defined by the appended claims. The specific embodiments given in this specification are examples of useful embodiments of this patent, and it will be apparent to those skilled in the art that this patent can be implemented using many variations of the devices, device components, and method steps disclosed herein.

[0051] The foregoing description of specific embodiments fully discloses the general features of this patent, enabling others to easily modify and / or adapt such embodiments for various applications by applying knowledge within the scope of the art, without excessive experimentation or deviation from the general concept of this patent. Therefore, based on the teachings and guidance provided herein, it is intended that such modifications and alterations be included within the meaning and scope of equivalents of the disclosed embodiments. It should be understood that the wording or terminology used herein is for descriptive purposes and not intended to be limiting; thus, the wording or terminology in this specification will be interpreted by those skilled in the art based on the foregoing teachings and guidance.

[0052] Furthermore, the scope of this patent should not be limited to any of the exemplary embodiments described above, but only to the appended claims and their equivalents.

Claims

1. A method for processing tobacco raw materials, characterized in that, Includes the following steps: Step A: Pre-treat the tobacco raw material, the pre-treatment including a first crushing, the tobacco raw material is crushed to obtain coarse material of 50-100 μm; Step B: The crude material is subjected to low-temperature treatment to obtain a low-temperature raw material with a temperature of -5~0℃; Step C: The raw material that has been subjected to low temperature is subjected to femtosecond laser treatment to obtain the finished tobacco material for preparing tobacco sheets. The proportion of particles with a diameter of 1-5 μm in the finished tobacco material is ≥98%, and the aroma component retention rate of the finished tobacco material is ≥95%.

2. The method for processing tobacco raw materials according to claim 1, characterized in that, In step A, the pretreatment further includes a drying process. The drying temperature is 60-65℃; The drying process takes 1.0-1.5 hours. The moisture content of the raw material after the drying process is 6-8%.

3. The method for processing tobacco raw materials according to claim 1, characterized in that, In step B, the cryogenic treatment includes cooling the coarse material using a mixture of liquid nitrogen and air.

4. The method for processing tobacco raw materials according to claim 1, characterized in that, In step C, the output wavelength of the femtosecond laser processing is 1064 nm; The pulse width of the femtosecond laser processing is 50-100 femtoseconds; The pulse energy of the femtosecond laser processing is 10-20 μJ; The repetition frequency of the femtosecond laser processing is 1-5 kHz; The laser power of the femtosecond laser processing is 50-100W.

5. A system for processing tobacco raw materials using any one of the methods described in claims 1-4, characterized in that, The system includes a raw material pretreatment module, a low-temperature pulverization module, and a femtosecond laser processing module; The raw material pretreatment module is used to perform the pretreatment on the tobacco raw material; The cryogenic pulverization module is used to perform the cryogenic treatment; The femtosecond laser processing module is used to perform the femtosecond laser processing.

6. The system according to claim 5, characterized in that, The raw material pretreatment module is connected to the low-temperature pulverizing module via a conveyor belt.

7. The system according to claim 5, characterized in that, The raw material pretreatment module includes a screening and impurity removal device, a preliminary crusher, and a drying device; The cryogenic pulverization module includes a cryogenic pulverization chamber, a mixed gas pipeline, a cryogenic maintenance unit, and a temperature sensor. The mixed gas pipeline is connected to the cryogenic pulverizing chamber and is used to introduce a mixed gas of liquid nitrogen and air into the cryogenic pulverizing chamber; The cryogenic maintenance unit is connected to the mixed gas pipeline and is used to adjust the ratio of liquid nitrogen to air to control the temperature of the cryogenic pulverizing chamber, so that the internal temperature of the cryogenic pulverizing chamber is stabilized at -5~0℃. The temperature sensor is arranged inside the cryogenic pulverizing chamber.

8. The system according to claim 7, characterized in that, The cryogenic maintenance unit includes a liquid nitrogen supply regulating device for regulating the input amount of liquid nitrogen.

9. The system according to claim 8, characterized in that, The femtosecond laser processing module includes a laser power sensor, a femtosecond laser emitter, a beam expander, a focusing lens, and a scanning galvanometer. The laser emitted by the femtosecond laser emitter is expanded in the beam expander and focused into the cryogenic pulverizing chamber by the focusing lens. The scanning galvanometer drives the laser to scan and pulverize the cryogenic raw material in the cryogenic pulverizing chamber. The laser power sensor is arranged inside the cryogenic pulverizing chamber.

10. The system according to claim 9, characterized in that, The system also includes a control module, which includes a PLC controller; The PLC controller is connected to the temperature sensor and the laser power sensor.

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