A mixing and stirring device for roll-pressed tobacco sheet

Abstract

The patent discloses a mixing and stirring device for roll-pressed tobacco sheet, which comprises a double-spiral stirring tank, an air flow injection mechanism, a rotating air curtain mechanism and an environment control system. The double-spiral stirring tank is used for mixing dry tobacco powder and wet material. The air flow injection mechanism is arranged inside the double-spiral stirring tank to temporarily separate the dry tobacco powder from the wet material. The rotating air curtain mechanism is arranged close to the double-spiral stirring tank to generate an air curtain layer for isolating external air inside the double-spiral stirring tank. The double-spiral stirring tank is connected to the environment control system, which is used for monitoring environmental factors inside the double-spiral stirring tank. The double-spiral stirring tank comprises first spiral blades and second spiral blades, and the rotating stirring directions of the first spiral blades and the second spiral blades are opposite. The mixing and stirring device combines air flow assistance and mechanical stirring, solves the problems of caking of mixed powder and wet material, wet material sticking and uneven distribution of material in the traditional mixing device, and improves the mixing efficiency.

Description

Technical Field

[0001] This patent belongs to the field of tobacco preparation technology, specifically relating to a mixing and stirring device for roll-pressed tobacco sheets. Background Technology

[0002] In the preparation of tobacco sheets using the roll forming process, traditional dry-wet mixing, especially when mixing powdered materials with materials with high moisture content, easily leads to problems such as powder agglomeration, uneven distribution of wet materials, and powder deposition. Existing mixing devices mostly employ mechanical stirring, but due to the differences in physical properties between powder and wet materials, traditional stirring methods often struggle to prevent agglomeration and can affect material flowability, reducing production efficiency. Therefore, designing a method that can uniformly mix dry and wet materials without agglomeration has become a pressing technical problem for the industry. Utility Model Content

[0003] The purpose of this patent is to provide a mixing and stirring device for roller-pressed tobacco sheets, so as to improve the uniformity and fluidity of the mixing and stirring.

[0004] To solve the above-mentioned technical problems, this patent adopts the following technical solution:

[0005] A mixing and stirring device for roller-pressed tobacco sheets includes a double-helix stirring tank, an airflow injection mechanism, a rotating air curtain mechanism, and an environmental control system.

[0006] The double-helix mixing tank is used to mix dry tobacco powder and wet materials. The double-helix mixing tank is equipped with an airflow injection mechanism to briefly separate the dry tobacco powder and wet materials.

[0007] The rotating air curtain mechanism is positioned close to the double-helix mixing tank, thereby creating an air curtain layer inside the double-helix mixing tank that isolates external air.

[0008] The twin-helix mixing tank is connected to an environmental control system, which monitors environmental factors within the tank.

[0009] The double-helix mixing tank includes a first helix blade and a second helix blade, and the first helix blade and the second helix blade rotate in opposite directions.

[0010] Furthermore, the double-helix mixing tank also includes a mixing tank body and a motor.

[0011] The first and second helical blades are arranged inside the mixing tank.

[0012] The motor connects the first and second helical blades to provide rotational power.

[0013] The air jet mechanism is located at the top of the mixing tank.

[0014] Furthermore, the airflow injection mechanism includes an airflow injection head.

[0015] There are at least two air jet heads.

[0016] Furthermore, the rotating air curtain mechanism includes a fan, an air supply chamber, and louvers;

[0017] The airflow generated by the fan is delivered to the louvers through the air supply chamber. The airflow is then redirected by the louvers, thus forming an air curtain layer above the mixing tank.

[0018] Furthermore, the opening diameter of the air supply chamber facing the fan is larger than the opening diameter facing the louvers.

[0019] Furthermore, a wet material conveying port for inputting wet materials is provided at the bottom of the mixing tank.

[0020] Furthermore, the mixing tank is a semi-closed shape with an opening at the top, allowing the dry tobacco powder to enter the mixing tank through the top opening.

[0021] Furthermore, the double helix mixing tank also includes a discharge port, which is located on the side wall of the mixing tank.

[0022] Furthermore, the environmental control system is connected to a digital display to show the measured values ​​of environmental elements.

[0023] Furthermore, the environmental control system includes a temperature control system and / or a humidity control system.

[0024] In this patent, the term "dry tobacco powder" refers to a powdery sample formed by pulverizing tobacco raw materials, including any one or more of flue-cured tobacco, sun-cured tobacco, aromatic tobacco, and burley tobacco.

[0025] In this patent, the term "wet material" refers to auxiliary reagents other than tobacco raw materials, including atomizing agents, binders, added fibers, modified starch, nanocellulose and / or additives, etc.

[0026] Binders are known in the art, including but not limited to: gums, such as guar gum, xanthan gum, gum arabic and locust bean gum; cellulose binders, such as hydroxypropyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose and ethyl cellulose; polysaccharides, such as starch and chitosan; organic acids, such as alginic acid; conjugate base salts of organic acids, such as sodium alginate, agar and pectin; and combinations thereof.

[0027] The added fiber is selected from any one or more of high-yield softwood pulp, softwood sulfate pulp, and bleached softwood sulfate pulp.

[0028] Nanocellulose uses nanocellulose in dry powder form.

[0029] Atomizing agents include, but are not limited to, polyols, such as propylene glycol and glycerin.

[0030] The additive may be a solid additive, a liquid additive, or a combination of solid and liquid additives. Suitable solid and liquid additives for use in this patent are known in the art, including but not limited to fragrances and plant-based additives.

[0031] The flavoring may include at least one of menthol and eugenol, or a combination of menthol and eugenol. Alternatively or additionally, the flavoring may include anethole, linalool, or a combination thereof.

[0032] In this patent, the term "roll-pressed tobacco sheet" refers to tobacco produced from waste materials such as tobacco dust, stems, and stalks generated during cigarette production, processed using a roll pressing method to replace tobacco leaves in the production of aerosol-generated products. The preparation process includes raw material grinding, pulp defiberization, quantitative blending, material mixing, and roll pressing.

[0033] This patent provides a mixing and stirring device for roller-pressed tobacco sheets. Utilizing a mixing design that combines airflow-assisted and mechanical stirring, it solves problems such as agglomeration, wet material adhesion, and uneven material distribution in traditional mixing devices, thereby improving mixing efficiency. Furthermore, by setting the spiral blades in opposite rotational directions within the double-spiral stirring tank, strong shearing and fluid forces are generated, maintaining high mixing efficiency and the fluidity of the mixed materials.

[0034] Furthermore, this patent utilizes a combination of a double-helix mixing tank, an air jet system, a rotating air curtain, and a humidity control system. The double-helix mixing tank generates shear force through rotating helical blades in opposite directions, ensuring uniform mixing of wet material and dry tobacco powder. The air jet system gently disperses the dry powder with adjustable airflow, preventing powder deposition and enhancing its suspension in the wet material. The rotating air curtain envelops the mixture with annular airflow, preventing moisture from affecting the mixing process. The humidity control system monitors humidity in real time and adjusts the liquid spray volume to ensure that the humidity of the wet material remains within the ideal range. This allows the mixing device to effectively reduce clumping, guarantee the uniformity and stability of the dry and wet materials, and is more suitable for the precise mixing of dry tobacco powder and wet material, showing broad application prospects. Attached Figure Description

[0035] 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.

[0036] Figure 1 This is a front view of the mixing and stirring device for the roller-pressed tobacco sheet in this patent;

[0037] Figure 2This is a top view of the mixing and stirring device for the roll-pressed tobacco sheet in this patent;

[0038] Figure 3 This is a schematic diagram of the rotating air curtain mechanism of the mixing and stirring device for the roller-pressed tobacco sheet in this patent.

[0039] Figure 4 This is a schematic diagram showing the airflow direction generated by the rotating air curtain device in this patent.

[0040] Figure 5 This is a process flow diagram of the mixing and stirring device for the roller-pressed tobacco sheet in this patent.

[0041] The reference numerals in the attached figures are explained as follows:

[0042] Double helix mixing tank: 1

[0043] Motor: 11

[0044] First spiral blade: 12

[0045] Second spiral blade: 13

[0046] Mixing tank: 14

[0047] Discharge port: 2

[0048] Rotating air curtain mechanism: 3

[0049] Venetian blinds: 31

[0050] Air supply box: 32

[0051] Fan: 33

[0052] Air jet heads: 4

[0053] Wet material conveyor: 5

[0054] Digital display: 6 Detailed Implementation

[0055] 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.

[0056] 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.

[0057] It should be noted that in this specification, similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and interpreted 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:

[0058] 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.

[0059] All other terms used herein for special definition are intended to have the general meaning understood by one of ordinary skill in the art, and 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.

[0060] 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.

[0061] 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.

[0062] 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:

[0063] The following publications are included: Marks' Standard Handbook for Mechanical Engineers (11th edition and other editions prior to the filing date of this application), published by McGraw-Hill, Inc.; DeGarmo's Materials and Processes in Manufacturing (13th edition and other editions prior to the filing date of this application), published by Wiley; Oberg's Machine Handbook (32nd edition and other editions prior to the filing date of this application), published by IndustrialPress Inc.; Cheng Daxian's Mechanical Design Handbook (6th edition and other editions prior to the filing date of this application), published by Chemical Industry Press; and Wen Bangchun's Modern Mechanical Design Handbook (6th edition and other editions prior to the filing date of this application), published by Machinery Industry Press.

[0064] 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.

[0065] refer to Figure 1-5 As shown, an airflow-mechanical mixing device for roller-pressed tobacco sheets includes at least a double-helix mixing tank 1, an airflow injection mechanism, a rotating air curtain mechanism 3, and an environmental control system.

[0066] An air jetting mechanism is installed on the top or upper side wall of the double helix mixing tank 1 to disperse the dry smoke powder and prevent it from settling at the bottom of the double helix mixing tank 1. A rotating air curtain mechanism 3 is set close to the double helix mixing tank 1 to generate an air curtain layer to isolate the mixture in the double helix mixing tank 1 from the outside air. An environmental control system is used to monitor environmental factors in the double helix mixing tank 1, such as temperature and humidity.

[0067] Double Helix Mixer

[0068] The double-helix mixing tank 1 includes a first helical blade 12 and a second helical blade 13. The first helical blade 12 and the second helical blade 13 can be configured to rotate in opposite directions and at different speeds within the mixing tank body 14. The opposite rotational directions generate strong shear and fluid forces, thoroughly mixing the wet material and dry tobacco powder to ensure uniformity. The different rotational speeds not only prevent powder particle deposition but also enhance the liquid distribution of the wet material. This design helps maintain the fluidity of the powder and wet material during mixing, preventing over-wetting and clumping, while ensuring uniform dispersion.

[0069] A motor 11 is installed on the outside of the side wall of the double helical mixing tank 1. The motor 11 is connected to the first helical blade 12 and the second helical blade 13 for rotational power control.

[0070] The mixing tank 14 is a semi-closed shape with an opening at the top. Dry tobacco powder is poured directly into the mixing tank 14 through the top opening, while wet material enters through the wet material conveying port 5 at the bottom of the mixing tank 14.

[0071] The double helix mixing tank also includes a discharge port 2, which is located on the side wall of the mixing tank body 14, preferably on the lower part of the side wall opposite to the air jet mechanism.

[0072] air jet mechanism

[0073] The airflow injection mechanism includes an airflow injection head 4, which can be an airflow nozzle structure. The airflow injection head 4 is disposed on the upper side wall of the mixing tank 14. The airflow injection head 4 can introduce external airflow into the double-helix mixing tank 1. The function of the airflow is to gently disperse the dry tobacco powder, preventing it from depositing on the wet material, and to improve the suspension of the tobacco powder in the wet material, achieving a temporary separation between the dry tobacco powder and the wet material. As the mixing proceeds, the suspended dry tobacco powder is gradually stirred into the wet material and mixed evenly under the action of the first helical blade 12 and the second helical blade 13. Due to its surface tension, the wet material cannot be quickly and evenly mixed with the dry tobacco powder at the beginning. Too much dry tobacco powder will instead deposit on the surface of the wet material, resulting in more agglomeration. The airflow injection head 4 sprays airflow to keep the dry tobacco powder in a suspended state, allowing it to be temporarily separated from the wet material and gradually fall onto the wet material, where it is stirred evenly under the action of the first helical blade 12 and the second helical blade 13. The airflow injection can reduce the direct contact between the tobacco powder and the wet material, reduce the risk of agglomeration, and at the same time promote the uniform moisture absorption of the wet material, enhancing the fluidity of the wet material in the mixing tank.

[0074] Rotating air curtain mechanism

[0075] A rotating air curtain mechanism 3 is installed around the mixing tank 14. Through an adjustable-speed fan 33 or annular nozzles, it forms an annular airflow curtain layer within the mixing tank 14 to envelop the mixed materials. The function of the air curtain layer is to isolate the mixed materials within the mixing tank 14 from the outside air, preventing the wet material surface from directly contacting moisture in the air or the external environment, ensuring that the wet material surface is not affected by humid air. By adjusting the airflow speed, the air curtain layer can prevent excessive airflow from affecting the mixing process, while maintaining the stability of the airflow layer and ensuring the optimal ratio between wet material and dry tobacco powder.

[0076] refer to Figure 3-4 As shown, a rotating air curtain mechanism 3 is arranged on the side corresponding to the motor 11. The rotating air curtain mechanism 3 includes a four-bladed fan 33 with adjustable wind speed. The fan 33 has turbine-shaped blades. The fan 33 generates vertical airflow, which is delivered to the louvers 31 through the air supply chamber 32. The louvers 31 then redirect the airflow to move laterally, thereby forming an air curtain layer above the mixing tank. The air jet head 4 can be positioned within the annular airflow range of the air curtain layer to introduce external air and disperse the dry smoke powder. Alternatively, the air jet head 4 can also be positioned outside the annular airflow range of the air curtain layer, i.e., at the top of the double-helix mixing tank 1. In this case, the jet pressure of the air jet head 4 needs to be greater than the wind speed of the air curtain layer to introduce external airflow into the mixing tank 14.

[0077] The opening diameter of the air supply chamber 32 facing the fan 33 is larger than the opening diameter of the air supply chamber 32 facing the louver 31, which increases the airflow reaching the louver 31 and further forms an air curtain layer above the mixing tank 14 with stronger wind speed and better isolation of outside air.

[0078] Environmental control system

[0079] An environmental control system is installed on the front of the mixing tank. The environmental control system is connected to a digital display 6 to display the environmental factor detection values ​​inside the mixing tank 14.

[0080] The environmental control system includes a temperature control system and / or a humidity control system. Based on the temperature and / or humidity levels displayed on the digital display 6 within the mixing tank 14, the flow rate of the wet material at the wet material conveying port 5 and the air speed of the rotating air curtain mechanism 3 can be adjusted manually or automatically by the system. The environmental control system can automatically and precisely control the amount of liquid added to the wet material, preventing excessive humidity from causing powder adhesion or clumping, and ensuring optimal mixing of the wet material and dry smoke powder.

[0081] The humidity control system can also monitor humidity changes in real time through sensors and issue control commands to automatically adjust the amount of moisture injected, ensuring that the humidity of the wet material is moderate during the mixing process and preventing the material from being too wet or too dry. The amount of moisture injected can be adjusted by introducing gases of different humidity levels into the mixing tank 14 through airflow nozzles 4 to regulate the overall ambient humidity. At least two airflow nozzles 4 can be provided; in this embodiment, two are preferred, to achieve the functions of dispersing dry smoke powder and adjusting the amount of moisture injected.

[0082] Working principle: Wet material is fed into the mixing tank 14 through the wet material conveyor 5, while dry tobacco powder is directly added to the mixing tank 14 from the outside. During this feeding process, the first spiral blade 12 and the second spiral blade 13 rotate at a certain speed in opposite directions to mix the wet material and dry tobacco powder. At this time, the mixture in the mixing tank 14 is in a semi-wet state. To prevent clumping and insufficient mixing, the air jet head 4 evenly blows the insufficiently mixed dry tobacco powder and places it in a stack. The air curtain layer coming out from the louver 31 prevents moisture in the air from entering the mixing tank. According to the temperature and humidity displayed on the digital display 6 of the environmental control system, the input rate of the wet material conveyor 5 and the speed of the fan 33 can be adjusted to ensure that the entire mixing process is carried out under certain temperature and humidity conditions. Finally, the mixed material is output from the discharge port 2 and can enter the roller press to produce tobacco sheets. The tobacco sheets can be cut into shreds to obtain roller-pressed tobacco shreds.

[0083] To further illustrate the advantages of this patent, the following references the application of the rolling method for preparing thin sheet tobacco in the mixing and stirring apparatus of this patent.

[0084] Example 1

[0085] In the laboratory, 100g of flue-cured tobacco, a single tobacco raw material, was prepared and divided into two portions, A and B, each weighing 50g.

[0086] Processing technology of raw material A:

[0087] S1. After removing impurities and drying 50g of flue-cured tobacco, pulverize it into tobacco powder of 200 mesh.

[0088] S2. The tobacco powder and auxiliary reagents (i.e., wet materials) are thoroughly mixed at a mass ratio of 1:1 using the mixing and stirring device of this patent to form a lumpy mixture. The auxiliary reagents include glycerol as an atomizing agent, chitosan as a binder, bleached coniferous sulfate pulp as an added fiber, modified starch, nanocellulose powder, and water. The proportions, by mass percentage, are: 25% atomizing agent, 5% binder, 3% added fiber, 5% modified starch, 5% nanocellulose powder, and the remainder is water.

[0089] S3. The lumpy mixture is repeatedly kneaded and pressed from multiple directions and angles to form a thin sheet; the thin sheet is then rolled and shaped using 6 or more sets of rollers; the rolled sheet is dried, shaped, and shredded. First, the sheet coated on the steel strip is heated, with side a heated by steam or electricity and side b heated by hot air through a heat exchanger; then, the sheet is flipped over, with side b heated by steam or resistance and side a heated by hot air through a heat exchanger; it is dried until the thickness reaches the specified value of 0.2 mm, and then shredded; the shred width is 1.0 mm and the length is 20 mm, producing rolled sheet shreds; the sheet shreds are then dried by hot air at a temperature of 75℃.

[0090] Processing technology of raw material B:

[0091] S4. After removing impurities and drying another 50g of flue-cured tobacco, grind it into tobacco powder of 200 mesh.

[0092] S5. The tobacco powder and auxiliary reagents (i.e., wet materials) are thoroughly mixed at a mass ratio of 1:1 using the mixing and stirring device of this patent to form a lumpy mixture. The auxiliary reagents include glycerol as an atomizing agent, chitosan as a binder, bleached coniferous sulfate pulp as an added fiber, modified starch, nanocellulose powder, and water. The atomizing agent accounts for 25% by mass, the binder accounts for 5%, the added fiber accounts for 3%, and the remainder is water.

[0093] S6. The lumpy mixture is repeatedly kneaded and pressed from multiple directions and angles to form a thin sheet; the thin sheet is then rolled and shaped using 6 or more sets of rollers; the rolled sheet is dried, shaped, and shredded. First, the sheet coated on the steel strip is heated, with side a heated by steam or electricity and side b heated by hot air through a heat exchanger; then, the sheet is flipped over, with side b heated by steam or resistance and side a heated by hot air through a heat exchanger; it is dried until the thickness reaches the specified value of 0.2 mm, and then shredded; the shred width is 1.0 mm and the length is 20 mm, producing rolled sheet shreds; the sheet shreds are then dried by hot air at a temperature of 75℃.

[0094] The mixing process of the agglomerated mixture of raw material A and raw material B was monitored, and the monitoring results are shown in Table 1.

[0095] Table 1: Monitoring Table for Mixing and Stirring of Agglomerated Mixtures

[0096]

[0097] Furthermore, quality tests were conducted on the roll-pressed filaments obtained from raw material A and the roll-pressed filaments obtained from raw material B. Physical indicators such as longitudinal tensile strength, transverse tensile strength, whole filament rate, broken filament rate, filling value, standard deviation of nicotine, standard deviation of glycerol, and standard deviation of moisture were tested, as well as chemical indicators such as flue gas quality analysis were tested. The test results all met the standards and showed good stability.

[0098] 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.

[0099] 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.

[0100] 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 mixing and stirring device for roller-pressed tobacco sheets, characterized in that, Includes a double-helix mixing tank, an air jet mechanism, a rotating air curtain mechanism, and an environmental control system. The double-helix mixing tank is used to mix dry tobacco powder and wet material. The airflow injection mechanism is arranged inside the double-helix mixing tank to temporarily separate the dry tobacco powder from the wet material. The rotating air curtain mechanism is positioned close to the double-helix mixing tank, thereby creating an air curtain layer inside the double-helix mixing tank that isolates external air. The double-helix mixing tank is connected to the environmental control system, which is used to monitor environmental factors within the double-helix mixing tank. The double-helix stirring tank includes a first helix blade and a second helix blade, and the first helix blade and the second helix blade rotate in opposite directions.

2. The mixing and stirring device for roll-pressed tobacco sheets according to claim 1, characterized in that, The double-helix mixing tank also includes a mixing tank body and a motor. The first helical blade and the second helical blade are arranged inside the mixing tank. The motor connects the first helical blade and the second helical blade to provide rotational power. The airflow injection mechanism is located at the upper part of the mixing tank.

3. The mixing and stirring device for roll-pressed tobacco sheets according to claim 2, characterized in that, The airflow injection mechanism includes an airflow injection head. There are at least two airflow nozzles.

4. The mixing and stirring device for roll-pressed tobacco sheets according to claim 2, characterized in that, The rotating air curtain mechanism includes a fan, an air supply chamber, and louvers; The airflow generated by the fan is delivered to the louvers through the air supply chamber. The airflow is then redirected by the louvers, thereby forming an air curtain layer above the mixing tank.

5. The mixing and stirring device for roll-pressed tobacco sheets according to claim 4, characterized in that, The opening diameter of the air supply chamber facing the fan is larger than the opening diameter facing the louvers.

6. The mixing and stirring apparatus for roll-pressed tobacco sheets according to claim 2, characterized in that, A wet material conveying port for inputting the wet material is provided at the bottom of the mixing tank.

7. The mixing and stirring apparatus for roll-pressed tobacco sheets according to claim 6, characterized in that, The mixing tank has a semi-closed shape with an opening at the top, and the dry tobacco powder can enter the mixing tank through the opening at the top.

8. The mixing and stirring apparatus for roll-pressed tobacco sheets according to claim 2, characterized in that, The double-helix mixing tank also includes a discharge port, which is located on the side wall of the mixing tank.

9. The mixing and stirring apparatus for roll-pressed tobacco sheets according to claim 1, characterized in that, The environmental control system is connected to a digital display to show the measured values ​​of the environmental elements.

10. The mixing and stirring apparatus for roll-pressed tobacco sheets according to claim 8, characterized in that, The environmental control system includes a temperature control system and / or a humidity control system.

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