Reconstituted tobacco, preparation method therefor, and use thereof

Abstract

Magnetic reconstituted tobacco, comprising magnetic reconstituted tobacco foil and / or magnetic reconstituted tobacco particles. The thickness of the magnetic reconstituted tobacco foil is 0.10-0.30 mm, and the particle size of the magnetic reconstituted tobacco particles is 0.5-2 mm; the composition of the magnetic reconstituted tobacco comprises a fiber material, a tobacco material, nanofibers, and a magnetic material; the magnetic material is a material that can be converted into heat after absorbing an alternating magnetic field. In addition, further provided are a preparation method and use of the magnetic reconstituted tobacco.

Description

Reconstituted tobacco leaf, preparation method and use thereof Technical Field

[0001] The present invention belongs to the field of tobacco, and in particular relates to a reconstituted tobacco leaf, a preparation method and use thereof. Background Art

[0002] Existing heat-not-burn aerosol products typically use reconstituted tobacco leaves or tobacco particles as the aerosol-forming matrix. The thick slurry method and papermaking method are the primary methods for producing reconstituted tobacco leaves used in heat-not-burn aerosol products. The thick slurry method requires drying to remove a large amount of water, resulting in high energy consumption. The finished product is brittle and weak, and high reconstitution losses occur during cutting. The papermaking method results in significant loss of flavor compounds in the finished product, and drying to remove water also requires significant energy consumption and is complex.

[0003] Existing aerosol products often use induction heating to atomize the desired components in the aerosol-forming matrix from the product to form an inhalable aerosol. In existing induction-heating aerosol products, the susceptor is a separate component and transfers its induction heat to the entire aerosol-forming matrix through local contact (central type) or non-contact (circumferential type) with the aerosol-forming matrix. The disadvantage of central heating is that the induction heat of the susceptor is transferred from the center of the aerosol-forming matrix in contact with it to its periphery, and the heat is significantly attenuated from the inside to the outside; the disadvantage of circumferential heating is that the induction heat of the susceptor is transferred from the periphery of the aerosol-forming matrix wrapping material in contact with it to the center of the aerosol-forming matrix after penetrating the wrapping material, and the heat is significantly attenuated from the outside to the inside. Therefore, in order to achieve the desired atomization effect of the aerosol-forming matrix, it is necessary to extend the product preheating time and increase the maximum heating temperature, thereby increasing the output power of the inductor. The adverse effects of this not only cause low heat utilization efficiency and uneven heat distribution of the aerosol-forming matrix, but also increase the energy consumption of the heating device used to heat the aerosol product.

[0004] The present invention is proposed for this purpose.

[0005] Summary of the Invention

[0006] In order to improve the above-mentioned defects, the present invention proposes a magnetic reconstituted tobacco foil and magnetic reconstituted tobacco particles and a manufacturing method thereof, which integrate magnetic induction materials into an aerosol-forming matrix. The purpose is to improve the utilization efficiency and heating rate of induced heat and reduce the energy consumption of the heating device when using aerosol products made from the magnetic aerosol-forming matrix, thereby saving manufacturing costs.

[0007] The technical solutions of the present invention are as follows:

[0008] The first aspect of the present invention discloses a magnetic reconstituted tobacco leaf, which includes a magnetic reconstituted tobacco leaf foil and / or magnetic reconstituted tobacco leaf particles; the thickness of the magnetic reconstituted tobacco leaf foil is 0.10-0.30 mm, and the particle size of the magnetic reconstituted tobacco leaf particles is 0.5-2 mm; the magnetic reconstituted tobacco leaf composition includes fiber material, tobacco material, nanofiber and magnetic material; the magnetic material is a material that can be converted into heat after absorbing an alternating magnetic field.

[0009] Preferably, the magnetic material is a magnetic nanomaterial, and the magnetic nanomaterial is magnetic nanoparticles and / or magnetic nanowires; the magnetic nanowires have a length of 5-100 μm and a diameter of 5-500 nm.

[0010] Preferably, the nanofiber is a plant nanofiber and / or a tobacco nanofiber; the nanofiber has a length of 1-10 μm and a diameter of 5-500 nm; and the fiber material is a cellulose fiber and / or a tobacco fiber material.

[0011] The second aspect of the present invention discloses a method for preparing the magnetic reconstituted tobacco, comprising the following steps:

[0012] (1) preparing tobacco material and fiber material into powder with a particle size of 60-120 mesh, adding a binder and mixing to obtain a solid mixture; the binder is one or more of starch, gum arabic, xanthan gum, guar gum, CMC and / or nanofiber gel;

[0013] (2) using a vacuum-assisted filtration method for nanofiber dispersion and magnetic nanowire suspension to obtain a nanofiber and magnetic nanowire composite gel; adding glycerol, water, and a surfactant, polyvinyl pyrrolidone, and mixing them uniformly to obtain a liquid mixture;

[0014] (3) stirring and mixing the solid mixture of step (1) and the liquid mixture of step (2) to obtain a dough having a water content of 20-40 wt %;

[0015] (4) compressing the dough obtained in step (3) into a parison using an extruder;

[0016] (5) laminating the preform obtained in step (4) in multiple stages at a certain temperature to obtain a foil having a thickness of 0.10-0.30 mm, and then drying the preform to reduce the moisture content to 5-10 wt %, thereby obtaining a reconstituted tobacco leaf foil;

[0017] or,

[0018] (6) The preform obtained in step (4) is crushed into irregular particles using a rotary granulator, and dried to reduce the moisture content to 1-6 wt %; and particles with a particle size of 0.5-2 mm are obtained by sieving, i.e., reconstituted tobacco leaf particles are obtained.

[0019] Alternatively, the method for preparing the magnetic reconstituted tobacco comprises the following steps:

[0020] (A) preparing a semi-wet mixture of tobacco material, nanofibers, and magnetic nanomaterials; the method comprises: adding surfactants polyvinyl pyrrolidone, glycerol, and propylene glycol, and performing continuous vacuum-assisted filtration of the nanofiber dispersion and the magnetic nanomaterial suspension to prepare a nanofiber and magnetic nanomaterial composite gel, i.e., the semi-wet mixture;

[0021] (B) inserting the semi-wet mixture of step (A) into a laminating roller and performing multi-stage lamination at a certain temperature to obtain a sheet with a thickness of 0.10-0.30 mm; applying an adhesive layer to the surface of the laminating roller before inserting the sheet base into the laminating roller; or

[0022] (C) preparing a cellulose fiber and / or tobacco fiber sheet base;

[0023] (D) applying the semi-wet mixture of step (A) to the base of step (C), and then inserting the obtained base into a laminating roller for multi-stage lamination at a certain temperature to obtain a sheet with a thickness of 0.10-0.30 mm; applying an adhesive layer on the surface of the laminating roller before inserting the base into the laminating roller;

[0024] The binder used in the binder layer is one or more of starch, gum arabic, xanthan gum, guar gum, CMC and / or nanofiber gel;

[0025] (E) Drying the sheet obtained in step (B) or step (D) to reduce the moisture content to 5-10 wt %, thereby obtaining the magnetic laminated reconstituted tobacco leaf foil.

[0026] Alternatively, the method for preparing the magnetic reconstituted tobacco comprises the following steps:

[0027] (a) beating tobacco material and fiber material, and then defibring to obtain tobacco pulp;

[0028] (b) mixing the nanofiber dispersion and the magnetic nanowire suspension, and then adding a binder solution and a surfactant polyvinyl pyrrolidone to obtain a magnetic nanocomposite fiber slurry;

[0029] (c) mixing the tobacco pulp of step (a) and the magnetic nanocomposite fiber pulp of step (b) to obtain a magnetic pulp, wherein the mass percentage of the magnetic nanocomposite fibers is 1% to 5wt%; and aligning and forming the magnetic tobacco sheet using a sheeting machine to obtain a magnetic tobacco sheet base;

[0030] Alternatively, a magnetic tobacco sheet base having a core layer of magnetic nanocomposite fibers is obtained by using a sheet making machine;

[0031] (d) preparing a wet coating material and a semi-wet coating material; the steps are as follows: crushing the tobacco material and the fiber material to obtain a uniform powder with a particle size of 60-120 mesh; then adding a solid natural binder and mixing uniformly; adding glycerin, propylene glycol, and water and mixing to maintain a moisture content of 50-80 wt% to obtain a wet coating material; and dehydrating to reduce the moisture content to 20-50 wt% to obtain a semi-wet coating material; the binder is one or more of starch, gum arabic, xanthan gum, guar gum, CMC, and / or nanofiber gel;

[0032] (e1) performing multi-stage lamination on the magnetic tobacco sheet obtained in step (c) at a certain temperature to obtain a magnetic reconstituted tobacco sheet with a thickness of 0.10-0.30 mm;

[0033] (f1) coating the wet coating material of step (4) on the magnetic reconstituted tobacco leaf base obtained in step (e1), and drying the coated material to a moisture content of 5-10 wt %, thereby obtaining the magnetic reconstituted tobacco leaf foil;

[0034] or,

[0035] (e2) coating the semi-wet coating material of step (d) on the tobacco base of step (c);

[0036] (f2) performing multi-stage lamination on the tobacco sheet coated in step (e2), and drying the sheet to a moisture content of 5-10 wt %, thereby obtaining the magnetic reconstituted tobacco leaf foil.

[0037] Alternatively, the method for preparing the magnetic reconstituted tobacco comprises the following steps:

[0038] 1) beating tobacco material and fiber material, and then defibration to obtain tobacco pulp;

[0039] 2) adding a binder solution and a surfactant, polyvinyl pyrrolidone, to the tobacco pulp of step 1) to mix to obtain a composite fiber pulp tobacco pulp; sheeting the tobacco pulp using a sheeting machine to obtain a tobacco sheet base;

[0040] 3) preparing a magnetic coating material, comprising the steps of: vacuum-assisted filtration of a nanofiber dispersion and a magnetic nanowire suspension to obtain a nanofiber and magnetic nanowire composite gel; adding the resulting composite gel to a mixed slurry of tobacco mixture powder, tobacco extract, glycerin, propylene glycol, and water; and then adding a binder solution, mixing uniformly to obtain a magnetic coating material, maintaining a solid content of 50-80 wt %.

[0041] 4) coating the magnetic coating material from step 3) on the tobacco sheet base from step 2) and drying to obtain a magnetic tobacco sheet;

[0042] 5) performing multi-stage lamination on the magnetic tobacco sheet obtained in step 4) at a certain temperature to obtain a magnetic reconstituted tobacco sheet with a thickness of 0.10-0.30 mm;

[0043] 6) Drying the prepared magnetic reconstituted tobacco leaf base to a moisture content of 5-10 wt % to obtain a magnetic reconstituted tobacco leaf foil.

[0044] Alternatively, the method for preparing the magnetic reconstituted tobacco comprises the following steps:

[0045] (I) crushing tobacco material and fiber material to defiberize, and dry-air forming the defiberized fibers to obtain a fiber thin layer;

[0046] (II) mixing the nanofiber dispersion and the magnetic nanowire suspension, adding a binder solution and a surfactant polyvinyl pyrrolidone to the mixture to obtain a magnetic nanocomposite fiber slurry; and then adding plant polysaccharide to the mixture to form a magnetic coating liquid;

[0047] (III) spraying the magnetic coating liquid of step (II) onto the fiber thin layer of step (I) and shaping it into a magnetic tobacco sheet;

[0048] (IV) preparing a wet coating material and a semi-wet coating material; the steps are as follows: crushing tobacco material and fiber material to obtain a uniform powder with a particle size of 60-120 mesh; then adding a solid natural binder and mixing uniformly; adding glycerin, propylene glycol, and water and mixing to maintain a moisture content of 50-80 wt% to obtain a wet coating material; and dehydrating to reduce the moisture content to 20-50 wt% to obtain a semi-wet coating material; the binder is one or more of starch, gum arabic, xanthan gum, guar gum, CMC, and / or nanofiber gel;

[0049] (LI) performing multi-stage lamination on the magnetic tobacco sheet obtained in step (II) at a certain temperature to obtain a magnetic reconstituted tobacco sheet with a thickness of 0.10-0.30 mm;

[0050] (LXI) coating the wet coating material of step (IV) on the magnetic reconstituted tobacco leaf base of step (LI), and drying to a moisture content of 5-10 wt % to obtain a magnetic reconstituted tobacco leaf foil;

[0051] or,

[0052] (LII) coating the semi-wet coating material of step (IV) on the tobacco base of step (III);

[0053] (LXⅡ) The tobacco sheet coated in step (LⅡ) is subjected to multi-stage lamination at a certain temperature and dried to a moisture content of 5-10 wt % to obtain a magnetic reconstituted tobacco leaf foil.

[0054] Preferably, the pressure of the multi-stage lamination is 1-5 MPa and the temperature is 70-200°C.

[0055] The third aspect of the present invention discloses the use of the magnetic reconstituted tobacco leaves as a matrix for forming a magnetic aerosol.

[0056] The magnetic reconstituted tobacco used for forming a magnetic aerosol matrix of the present invention comprises magnetic reconstituted tobacco foil and magnetic reconstituted tobacco particles; the magnetic reconstituted tobacco contains a tobacco mixture, nanofibers and a magnetic material; the nanofibers can be wood nanofibers and / or tobacco nanofibers; the nanofibers can be other plant nanofibers; the diameter and length of the nanofibers are 5-100 nm and 1-10 μm, respectively.

[0057] The magnetic material is any material that can be converted into heat after absorbing an alternating magnetic field, such as a ferromagnetic material or a ferrimagnetic material; specifically, iron or iron alloys such as stainless steel, nickel, and nickel alloys such as corrosion-resistant Fe-Ni-Cr alloys. Preferably, the magnetic material is a magnetic nanomaterial, such as nanoparticles, nanosheets, nanospheres, nanorods, nanotubes, nanowires, and the like, particularly nanoparticles and / or nanowires. The nanoparticles and / or nanowires include, but are not limited to, nickel, cobalt, iron-nickel, cobalt-nickel, cobalt-iron, iron-cobalt-nickel, iron-molybdenum-nickel, and their alloys. Preferably, the magnetic material is a magnetic nanowire. The length is 5-100 μm, and the average diameter is 5-500 nm.

[0058] The magnetic reconstituted tobacco foil is obtained by extruding and rolling a tobacco mixture, nanofibers and magnetic nanomaterials; the magnetic reconstituted tobacco particles are obtained by extruding, granulating and screening the tobacco mixture, nanofibers and magnetic nanomaterials; the preparation method of the magnetic reconstituted tobacco comprises: forming a dough-like object of tobacco, nanofibers and magnetic nanomaterials; adding a surfactant such as polyvinyl pyrrolidone (PVP) to the mixture of tobacco, nanofibers and magnetic nanomaterials to facilitate the combination of magnetic nanomaterials and nanofibers; using continuous vacuum-assisted filtration of nanofiber dispersion and magnetic nanomaterials A suspension method is used to obtain a composite gel of nanofibers and magnetic nanomaterials. The dough-like material is subjected to an extrusion process, whereby the magnetic nanomaterials are subjected to heat extrusion to form interconnected magnetic conductive paths, which are tightly bonded to the extruded reconstituted tobacco leaf parison. Heat is applied to the rolling rollers, whereby the magnetic nanomaterials are subjected to heat lamination or further nano-welding to form interconnected magnetic conductive paths, which are more tightly bonded to the entire reconstituted tobacco leaf, thereby obtaining reconstituted tobacco leaf foil. The thickness of the foil can be controlled by adjusting the rolling roller spacing. The resulting magnetic reconstituted tobacco leaf foil can be rolled, sliced, or shredded, and subsequently processed for use in a magnetic aerosol-forming matrix. The tobacco material can be tobacco powder, debris, tobacco stems, or the like.

[0059] Magnetic reconstituted tobacco leaf foil is used as an aerosol-forming matrix. It can be rolled, sliced, or shredded, and then processed into an aerosol-forming matrix. The magnetic aerosol-forming matrix contains a material that can be atomized at a suitable temperature to form an inhalable aerosol. The aerosol formed by atomization contains an aerosolizing agent, flavoring substances, and / or nicotine, and may also contain other inhalable ingredients. The magnetic aerosol-forming matrix is ​​combined with the wrapping material to form the aerosol-generating section, which is then combined with other components including the support section, cooling section, and filter section to form the aerosol product.

[0060] Beneficial effects of the present invention:

[0061] In the method for preparing magnetic reconstituted tobacco leaves of the present invention, during the extrusion of the dough-like material through the extruder, the heater on the extruder can heat the dough-like material by heat conduction. In addition, the dough-like material rubs and shears against the barrel, screw, and dough-like material of the extruder during movement, generating a large amount of heat, causing the magnetic nanomaterial in the preform to be thermally extruded. When the extruded preform is hot-pressed into foil at high pressure on a rolling mill, the magnetic nanomaterial therein further undergoes thermal lamination and nano-welding. Thermal lamination and nano-welding can completely remove the surfactant component (such as PVP) wrapped around the outer surface of the magnetic nanowires and sinter the magnetic nanowire joints, significantly reducing contact resistance, forming an interconnected, strong and stable magnetic nanowire magnetic conductive path and eddy current network, and at the same time significantly improving the tensile strength of the reconstituted tobacco leaf foil. Thermal lamination and nano-welding can also significantly increase the heating temperature of the magnetic reconstituted tobacco leaf foil because the resistance is significantly reduced after welding, resulting in an increase in the induced eddy current and electron transmission capacity within the reconstituted tobacco leaf foil. Nano-welding can improve the induction heating performance without increasing the content of magnetic nanowires, reducing the cost of using magnetic materials.

[0062] The preparation method of the present invention can uniformly and firmly disperse the nanofibers and magnetic nanomaterials into the reconstituted tobacco leaf substrate through continuous high-pressure homogenization multiple times (generally not less than three times); vacuum-assisted filtration is conducive to the nanofibers forming an entangled network through hydrogen bonds, thereby obtaining an ultra-rigid nanostructure with high thermal stability and high transparency, further enhancing the high temperature resistance and mechanical strength of the magnetic reconstituted tobacco leaf; the addition of surfactants such as polyvinyl pyrrolidone (PVP) during the manufacturing process can wrap magnetic nanomaterials such as magnetic nanowires. Through the strong hydrogen bonding interaction between the carbonyl group of the additive and the hydroxyl group of the nanofiber, the magnetic nanowires partially wrapped by the cellulose act as a skeleton. This facilitates load transfer and energy dissipation during the tensile process of magnetic reconstituted tobacco, dissipating stress and achieving excellent mechanical properties and structural stability. Multi-stage thermal lamination and nanowelding completely remove the surfactant components (such as PVP) surrounding the magnetic nanowires and sinter the magnetic nanowire joints, significantly reducing contact resistance and forming interconnected, robust, and stable magnetic nanowire magnetic conduction paths and eddy current networks while significantly increasing the tensile strength of the reconstituted tobacco. Multi-stage thermal lamination and nanowelding also significantly increase the heating temperature of the magnetic reconstituted tobacco, as the resistance decreases significantly after welding, leading to an increase in induced eddy currents and electron transport capacity within the reconstituted tobacco. Nanowelding improves induction heating performance without increasing the content of magnetic nanowires, reducing the cost of magnetic materials.

[0063] Compared to traditional papermaking and thick pulp methods for reconstituted tobacco, the magnetic reconstituted tobacco foil and reconstituted tobacco granule manufacturing processes of the present invention require less water, significantly shorten the drying process, and reduce production energy consumption. Because the foil dries faster, the finished reconstituted tobacco leaves retain more flavor and nicotine, allowing for the use of less binder, reducing the impact of unpleasant odors generated during the heating process of aerosol products on the taste. Precisely adjusting the rolling mill roll gap allows for a uniform and controllable thickness of the finished reconstituted tobacco leaves. This precision and stability of thickness helps ensure consistency in downstream processes and helps ensure that important product indicators, such as nicotine content, remain within specified ranges. The increased stability and reliability of the reconstituted tobacco leaves also significantly improves the operational stability of the heating device. The preparation method of the present invention eliminates the need for drying and preheating tobacco scraps and fibers. Because the extrusion process inherently binds materials, the amount of binder used can be significantly reduced. Consequently, raw material and production costs can be further reduced. The tobacco materials used in the present invention can include tobacco powder, scraps, tobacco stems, and others, reducing the cost of using pure tobacco leaves as raw materials for traditional granular aerosol products. The preparation method of the present invention utilizes the same raw materials and extrusion process to prepare the mold blanks required for reconstituted tobacco leaf foil and reconstituted tobacco particles, saving the floor space and financial investment of production equipment, and facilitating the simultaneous manufacture of two types of products, reconstituted tobacco leaf foil and reconstituted tobacco particles.

[0064] The fiber material of the present invention is cellulose fiber and / or tobacco fiber material, and the flexible nanofibers are entangled with each other so that they can create a nanoscale network; on the one hand, the strength of the fiber network is enhanced by increasing the number of hydrogen bonds between each fiber (fibril) or fibers; on the other hand, the nanofibers with small size, high surface area and flexibility can naturally increase the strength of the network; thus, the nanofibers can successfully improve the tensile strength of reconstituted tobacco leaves; at the same time, the highly active hydroxyl groups in the nanofibers can be modified by chemical and physical treatment to obtain the desired properties, such as increasing their adhesion to magnetic materials.

[0065] The magnetic reconstituted tobacco of the present invention has excellent mechanical properties, thermal stability, flexibility (foil) and porosity; the ferromagnetic nanowires have a high aspect ratio and excellent mechanical properties, which are advantageous for forming flexible magnetic conductive circuits and eddy current networks; the magnetic reconstituted tobacco of the present invention has the characteristics of low driving voltage, rapid heating and high heating temperature, which can meet the requirements of energy saving, rapid heating and instant use when using aerosol products. When the magnetic reconstituted tobacco leaves of the present invention are used in a magnetic aerosol-forming matrix, the magnetic material therein acts as a receptor, uniformly distributed throughout the aerosol-forming matrix and forming a magnetic conductive path. This is different from existing induction heating aerosol products in which the receptor is a separate component and transfers its induced heat to the entire aerosol-forming matrix through local contact (central type) or non-contact (circumferential type) with the aerosol-forming matrix. The disadvantage of central heating is that the induced heat of the receptor is transferred from the center of the aerosol-forming matrix in contact with it to its periphery, and the heat is significantly attenuated from the inside to the outside. The disadvantage of circumferential heating is that the induced heat of the receptor is transferred from the periphery of the aerosol-forming matrix wrapping material in contact with it to the center of the aerosol-forming matrix after penetrating the wrapping material, and the heat is significantly attenuated from the outside to the inside. The integral heating of the magnetic reconstituted tobacco leaves of the present invention is that the magnetic material in the entire aerosol-forming matrix receives the radiated alternating magnetic field, generating induced heat distributed throughout the aerosol-forming matrix. The disadvantages of existing central induction heating also include: the insertion and removal of the sensor on the heating device can easily cause the aerosol-forming matrix to move. Specifically, when inserted, the aerosol-forming matrix is ​​pushed to the mouthpiece end of the aerosol product, which affects heat transfer, aerosol generation, and suction force; when removed, part of the aerosol-forming matrix is ​​carried out into the heating device along with the sensor, and the atomized condensate remains on the surface of the sensor, causing problems with cleaning residues; the above-mentioned built-in sensor in the aerosol product brings difficulties to the processing, placement, and positioning of the sensor in the aerosol-forming matrix during the product manufacturing process. The sensor of the present invention is integrated and homogeneously formed with the magnetic reconstituted tobacco foil and magnetic reconstituted tobacco particles during the manufacturing process, without the need for additional sensor processing, aerosol-forming matrix placement and positioning equipment, and there is no problem of aerosol-forming matrix movement and cleaning residues during the use of the aerosol product.

[0066] The uniform layered network distribution of the magnetic material in the magnetic reconstituted tobacco leaf of the present invention within the reconstituted tobacco leaf foil and the uniform spherical network distribution within the particles significantly shortens the magnetothermal conversion path. The magnetic material in the aerosol-forming matrix essentially instantaneously transfers its heat to the aerosol-forming matrix as a whole, significantly improving the aerosol-forming matrix's efficiency in utilizing heat, which in turn significantly reduces the energy consumption of the heating device. Furthermore, because the aerosol-forming matrix itself serves as the induction heating element for the aerosol product containing it, there is no need to install additional sensors within the aerosol product (e.g., within the aerosol-forming matrix) or on the peripheral heating device. This significantly reduces the size of the heating device and eases the difficulty of manufacturing the aerosol product, saving both manufacturing costs and facilitating the portability of the heating device.

[0067] Existing induction-heated aerosol products utilize a localized-to-global heat transfer method. This requires a relatively high temperature for the susceptor heat source to ensure sufficient heat transfer to the entire aerosol-forming matrix. Furthermore, sufficient heat accumulation within the aerosol-forming matrix is ​​required to achieve atomization and, therefore, inhalability of the aerosol produced. This creates two technical bottlenecks: a sufficiently high initial susceptor temperature and a sufficiently long preheating time for the aerosol product. This increases the energy consumption of the heating device and hinders consumer use of the product. The magnetic reconstituted tobacco leaf of the present invention is used for the magnetic aerosol forming matrix. Instead of applying a whole block of magnetic material on the surface or inside of the aerosol forming matrix, the magnetic nanomaterial is spread in the reconstituted tobacco leaf foil by adjusting the area fraction of a small amount of magnetic nanomaterial therein, and by hot extrusion, hot lamination and nano-welding, or by hot extrusion and rotary extrusion in the process of rotary granulation to mix the magnetic nanomaterial in the reconstituted tobacco particles, thereby greatly increasing the magnetic induction surface area and increasing the interconnectivity of the magnetic nanomaterial. Due to the thin thickness of the magnetic reconstituted tobacco leaf foil (0.10-0.30 mm) and the small particle size of the magnetic reconstituted tobacco leaf particles ( 0.5-2mm), significantly reducing the skin depth of the magnetic field inside the magnetic nanomaterial, not only making the magnetic flux attenuation smaller, but also greatly reducing the resistance of the magnetic network; therefore, under the influence of increased conductivity and reduced thermal resistance, the initial temperature set by the heating device can be controllably lowered and heated to the set operating temperature in a very short time, significantly shortening the preheating waiting time of the heating device and enabling the product to be started and used immediately; similarly, the aerosol product can be cooled from the operating temperature to room temperature in a very short time, significantly reducing the problem of heat accumulation in the aerosol-forming matrix and ensuring the consistency of the experience of the aerosol product in each use cycle. Due to the increased conductivity and reduced thermal resistance, the magnetic reconstituted tobacco leaves of the present invention can select magnetic materials with an intrinsic Curie temperature close to the actual operating temperature, without the need to select magnetic materials with a high Curie temperature that exceeds the actual operating temperature, which makes the temperature control of the heating device easier and more accurate.

[0068] The vacuum-assisted filtration method adopted by the present invention is a method of coating magnetic material in the form of a suspension on the surface of nanofibers using vacuum filtration; vacuum-assisted filtration technology greatly improves the deposition rate of nanomaterials, and reduces the loss of nanomaterials during the preparation process, and is a very simple method for preparing multifunctional nanocomposite materials; vacuum-assisted filtration technology is conducive to the nanofibers forming an entangled network through hydrogen bonds, thereby obtaining an ultra-rigid nanostructure with high thermal stability and high transparency, further enhancing the high temperature resistance and mechanical strength of the magnetic aerosol forming matrix.

[0069] The advantages of the magnetic reconstituted tobacco leaves prepared by using ferromagnetic nanowires in the present invention are further described as follows: 1. The heating performance of the magnetic reconstituted tobacco leaves can be easily adjusted by controlling the amount of magnetic nanowires or the driving voltage. For example, when the driving voltage is constant, the heating temperature of the magnetic reconstituted tobacco leaves with a high content of ferromagnetic nanowires (such as Fe-Ni NWs) increases due to the reduced resistance. Due to the efficient Fe-Ni NWs embedded structure and the interconnected electromagnetic Fe-Ni NWs skeleton, high temperatures can be obtained at lower driving voltages by moderately increasing the Fe-Ni NWs area fraction, typically with an Fe-Ni NWs area fraction of 0.5 g / m 2 When the driving voltage is 3V, the temperature can rise to above 200℃ within 10s; or if the area fraction of Fe-Ni NWs is 1.0g / m 2 When the driving voltage is 2V, the temperature can rise to above 250℃ within 7s; the beneficial effect of obtaining high temperature with low driving voltage is saving electricity and reducing energy consumption. 2. When an alternating magnetic field is applied to the prepared magnetic reconstructed tobacco leaves, Joule heat is generated due to the inelastic collision of the induced accelerated eddy current electrons and phonons in the magnetic nanowires, causing the aerosol-forming matrix to heat up rapidly. When the alternating magnetic field is stopped, the temperature of the magnetic reconstructed tobacco leaves drops rapidly due to the lack of Joule heat. Especially when the area of ​​the magnetic reconstructed tobacco leaves is greatly reduced (such as when the magnetic reconstructed tobacco leaf foil is processed into short filaments, thin filaments or fragments), the heating and cooling rates will increase rapidly due to the significant increase in eddy current density and power density, and it is expected that the heating and cooling rates will increase rapidly within 1 second or even milliseconds. This is beneficial for the use of magnetic reconstructed tobacco leaves in aerosol products, reducing the subsequent sensory changes in the aerosol-forming matrix caused by the accumulation of previous heat. At the same time, it also improves the user experience by significantly shortening the preheating waiting time. Another beneficial effect is that the electrical energy consumed by heating the magnetic reconstructed tobacco leaves to the required temperature for aerosol products is reduced. 3. The present invention's preparation method and the composite lamination technology of tobacco materials, nanofibers, and magnetic nanomaterials offer practical production flexibility and enable precise manipulation of the properties of the final product. 4. The present invention's magnetic reconstituted tobacco leaves exhibit ideal tensile strength, flavor retention, magnetic controllability, and cost-effectiveness.

[0070] The present invention's method for preparing magnetic reconstituted tobacco foil utilizes a directional arrangement of magnetic material in a sheet material, based on the direction of the inductor's excitation magnetic field and the distribution of magnetic flux lines passing through an aerosol-forming substrate. This allows the resulting magnetic reconstituted tobacco foil, and even the aerosol-forming substrate, to achieve maximum magnetic field utilization efficiency and magnetic coupling strength when used in conjunction with a heating device. The multi-layered magnetic tobacco foil can be designed with varying numbers of magnetic material layers, depending on the subsequent process requirements and characteristics of the product. For example, a sandwich-shaped tobacco foil, with the inner and outer layers made of tobacco fiber and the middle core layer made of magnetic nanocomposite fibers, can be designed. The use of semi-wet coating significantly reduces water consumption, significantly shortens the drying process, and reduces production energy consumption compared to traditional papermaking and thick pulp methods for reconstituted tobacco production. Because the foil dries faster, the finished reconstituted tobacco foil retains flavor substances and nicotine more effectively, requiring less binder, thereby minimizing the impact of unpleasant odors generated during the heating of aerosol products on the taste.

[0071] The present invention's method for preparing magnetic reconstituted tobacco foil includes the steps of preparing a composite gel of nanofibers and magnetic nanowires through vacuum-assisted filtration. The resulting magnetic coating material can be considered a magnetic gel. The magnetic gel combines magnetic properties with high elasticity and flexibility, improving the film-forming properties of the coating material and facilitating the uniform distribution of the magnetic material on the sheet substrate. It also enhances the processing performance of the finished tobacco foil during rolling and gathering processes.

[0072] Compared with traditional dry-process reconstituted tobacco leaves, the preparation method of the magnetic reconstituted tobacco leaf foil of the present invention obtains a fiber thin layer by dry process and then coats it for multi-stage lamination, which not only retains the looseness of the reconstituted tobacco leaf structure, but also the nanofibers, magnetic nanowires and polysaccharides contained in the magnetic coating liquid strengthen the hydrogen bond interaction with the fiber thin layer, enhance the sheet base shaping effect and mechanical properties, and reduce the powder loss, breakage and fracture phenomena in the downstream cutting or forming process. DETAILED DESCRIPTION

[0073] In order to make the purpose of the present invention, technical scheme clearer, be described in detail with reference to the following examples, embodiment is intended to illustrate the content of the present invention, rather than further limit the scope of protection of the present invention. The process, conditions, reagents, experimental techniques etc. implemented, except the content specifically mentioned below, are common knowledge and common common sense in this area, and the present invention has no particular restrictions. The experimental techniques for the unremarked specific conditions in each embodiment are usually according to conventional conditions or according to the conditions recommended by the manufacturer. Unless otherwise indicated, the implication of all professional terms and scientific terms used in this specification sheets is the same as the implication generally understood by those skilled in the art to which the present invention belongs. However, in case of conflict, the present specification sheets comprising the definitions shall prevail.

[0074] Example 1: Preparation of magnetic reconstituted tobacco leaf foil, the steps are as follows:

[0075] (1) Screen tobacco debris and fibers, remove large powder blocks by shaking; use a magnet to remove metal objects;

[0076] (2) drying tobacco scraps and fibers to a moisture content of 5-10 wt% and grinding the solids with an impact mill to obtain a uniform powder with a particle size of 60-120 mesh;

[0077] (3) Mixing solid natural binders such as guar gum, xanthan gum or CMC (carboxymethyl cellulose) and others using a ribbon blender;

[0078] (4) vacuum-assisted filtration of the nanofiber dispersion to obtain a wet viscoelastic nanofiber gel; further vacuum-assisted filtration of the magnetic nanowire suspension to obtain a nanofiber and magnetic nanowire composite gel;

[0079] (5) mixing the composite gel with glycerol and water using a wet mixer, and adding a surfactant such as polyvinylpyrrolidone (PVP) to ensure the required magnetic properties, humidity, and mechanical strength of the reconstituted tobacco leaves;

[0080] (6) mixing the solid and liquid components using a blender while maintaining a water content of 20-40 wt % to obtain a dough-like material;

[0081] (7) feeding the dough into an extruder and compressing and shaping the dough into a parison for extrusion;

[0082] (8) The preform is transferred to a rolling mill and flattened into a flat and uniform foil with a thickness of 0.10-0.30 mm using a hot roller under high pressure; the temperature of the hot roller can be set within the range of 70-200°C; the extrusion pressure is 1-5 MPa;

[0083] (9) The foil prepared above is further dried by a drying device to reduce the water content to 5-10 wt%.

[0084] (10) Depending on the end application requirements, the foil is wound onto a reel or cut into slices or shreds for use as a magnetic aerosol-forming matrix.

[0085] Example 2: Preparation of magnetic reconstituted tobacco particles, the steps are as follows:

[0086] (1) Prepare a preform using steps 1-7 in Example 1;

[0087] (2) transferring the above-mentioned preform to a rotary pelletizer, and crushing the preform into irregular particles by rotary pelletizing;

[0088] (3) further drying the irregular particles obtained above by a drying device to reduce the water content to 1-6 wt%;

[0089] (4) screening the dried irregular particles using a screening machine to obtain particles with a particle size ranging from 0.5 to 2 mm;

[0090] (5) Depending on the final application requirements, the particles are wrapped or packed in the components of the aerosol product to form a magnetic aerosol matrix.

[0091] Example 3: Preparation of magnetic laminated reconstituted tobacco leaves, the steps are as follows:

[0092] (1) Screen tobacco debris and fibers, remove large powder blocks by shaking; use a magnet to remove metal objects;

[0093] (2) drying tobacco scraps and fibers to a moisture content of 5-10 wt% and grinding the solids with an impact mill to obtain a uniform powder with a particle size of 60-120 mesh;

[0094] (3) Mixing solid natural binders such as guar gum, xanthan gum, or CMC (carboxymethyl cellulose) using a ribbon blender;

[0095] (4) vacuum-assisted filtration of the nanofiber dispersion to obtain a wet viscoelastic nanofiber gel; further vacuum-assisted filtration of the magnetic nanowire suspension to obtain a nanofiber and magnetic nanowire composite gel;

[0096] (5) using a wet mixer to mix the composite gel, glycerol, and propylene glycol, and adding a surfactant such as polyvinyl pyrrolidone (PVP) to ensure the required magnetic properties, humidity, and mechanical strength of the reconstituted tobacco leaves;

[0097] (6) mixing the solid and liquid components using a high-speed turbine and maintaining the water content at 20-50 wt % to obtain a semi-wet powder to maintain a low drying cost;

[0098] (7) through three-stage lamination, the semi-wet powder is passed through several sets of high-pressure rollers with different heating temperatures to form a foil with a thickness of 0.10-0.30 mm; the lamination temperature of the first stage is 70-100° C., the lamination temperature of the second stage is 120-150° C., and the lamination temperature of the third stage is 160-200° C.; the lamination pressure increases step by step, from 1 MPa at the first stage to 3 MPa at the second stage and then to 5 MPa at the third stage;

[0099] (8) further drying the foil obtained above by a drying device to reduce the water content to 5-10 wt%;

[0100] (9) Depending on the end application requirements, the foil is cut into sheets or shreds for use in an aerosol-forming matrix.

[0101] Example 4: Preparation of magnetic laminated reconstituted tobacco leaf foil, the steps are as follows:

[0102] (1) preparing a roll-shaped sheet base using cellulose fiber and tobacco fiber in advance;

[0103] (2) Prepare a semi-wet powder using steps 1-6 of Example 1;

[0104] (3) laminating the semi-wet powder together with the base sheet through three stages, the specific operation being the same as (7) in Example 1; after lamination, the semi-wet powder is bonded to one side of the base sheet;

[0105] (4) drying the substrate with the semi-wet powder bound to one side, and then bonding the semi-wet powder to the other side of the substrate according to the above step (3);

[0106] (5) The foil with semi-wet powder on both sides is passed through a drying device to reduce the moisture content to 5-10 wt%;

[0107] (6) Depending on the final application requirements, the foil is cut into sheets or shreds for use in an aerosol-forming matrix.

[0108] Example 5: Preparation of magnetic reconstituted tobacco leaf foil, the steps are as follows:

[0109] (1) Screen tobacco debris and fibers, remove large powder blocks by shaking; use a magnet to remove metal objects;

[0110] (2) drying tobacco scraps and fibers to a moisture content of 5-10 wt% and grinding the solids with an impact mill to obtain a uniform powder with a particle size of 60-120 mesh;

[0111] (3) vacuum-assisted filtration of the nanofiber dispersion to obtain a wet viscoelastic nanofiber gel; further vacuum-assisted filtration of the magnetic nanowire suspension to obtain a nanofiber and magnetic nanowire composite gel;

[0112] (4) using a wet mixer to mix the composite gel, glycerol, and propylene glycol, and adding a surfactant, polyvinyl pyrrolidone (PVP), to ensure the required magnetic properties, humidity, and mechanical strength of the reconstituted tobacco leaves;

[0113] (5) mixing the solid and liquid components using a high-speed turbine and maintaining the water content at 20-50 wt % to obtain a semi-wet powder to maintain a low drying cost;

[0114] (6) Immersing the laminating roller in an adhesive mixture bath formed by solid natural adhesives such as guar gum, xanthan gum, and CMC (carboxymethyl cellulose) to adhere an adhesive layer to the roller surface;

[0115] (7) through three-stage lamination, the semi-wet powder is passed through several sets of high-pressure rollers coated with adhesive layers and having a forming function and set at different heating temperatures to form a foil with a thickness of 0.10-0.30 mm; the lamination temperature of the first stage is 70-100° C., the lamination temperature of the second stage is 120-150° C., and the lamination temperature of the third stage is 160-200° C.; the lamination pressure can be maintained constant at multiple stages, such as 5 MPa;

[0116] (8) further drying the foil obtained above by a drying device to reduce the water content to 5-10 wt%;

[0117] (9) Depending on the end application requirements, the foil is cut into sheets or shreds for use in an aerosol-forming matrix.

[0118] Example 6: Preparation of magnetic reconstituted tobacco leaf foil, the steps are as follows:

[0119] (1) mixing tobacco leaves and tobacco stems in a certain proportion and beating the mixture, mixing the mixture with wood pulp again, adding water to adjust the concentration to 1-5 wt%, and further beating the mixture to obtain tobacco pulp;

[0120] (2) After the tobacco pulp is defibrated using a defiberizer, water is added to the tobacco pulp to a concentration of 0.2-2 wt %, and the mixture is transferred to a stirring device for stirring; the nanofiber dispersion and the magnetic nanowire suspension are mixed and stirred, and a binder solution and a surfactant are added and mixed, and the mixture is stirred continuously to obtain a magnetic nanocomposite fiber pulp; the binder solution comprises a solution of a mixed natural binder such as guar gum, xanthan gum or CMC (carboxymethyl cellulose) and others;

[0121] (3) mixing the tobacco pulp and the magnetic nanocomposite fiber pulp to obtain a magnetic pulp, wherein the mass percentage of the magnetic nanocomposite fibers is, for example, 1-5 wt%, and using a sheet machine to align and arrange the pulp to obtain a magnetic tobacco sheet base; alternatively, using a sheet machine to obtain a magnetic multilayer tobacco sheet base having a core layer of magnetic nanocomposite fibers;

[0122] (4) preparing a wet coating material and a semi-wet coating material; the steps are as follows: (a) crushing tobacco material and fiber material to obtain a uniform powder with a particle size of 60-120 mesh; then adding a solid natural binder and mixing uniformly; (b) adding glycerin, propylene glycol and water and mixing to maintain the water content at 50-80 wt% to obtain a wet coating material; alternatively, maintaining the water content at 20-50 wt% to obtain a semi-wet coating material;

[0123] (51) performing three-stage lamination on the magnetic tobacco sheet obtained in step (3) at a certain temperature to obtain a magnetic reconstituted tobacco sheet with a thickness of 0.10-0.30 mm;

[0124] (61) coating the wet coating material of step (4) on the magnetic reconstituted tobacco leaf base of step (51), and drying the coated material to a moisture content of 5-10 wt % to obtain a magnetic reconstituted tobacco leaf foil;

[0125] or,

[0126] (52) applying the semi-wet coating material of step (4) onto the tobacco sheet base of step (3);

[0127] (62) performing three-stage lamination on the tobacco sheet coated in step (52) to obtain a magnetic reconstituted tobacco leaf having a thickness of 0.10-0.30 mm, and drying the laminate to obtain a moisture content of 5-10 wt % to obtain a magnetic reconstituted tobacco leaf foil;

[0128] Depending on the final application requirements, the obtained magnetic reconstituted tobacco foil is rolled or cut into sheets or shredded for use as an aerosol-forming matrix.

[0129] The three-stage lamination in steps (51) and (62) uses high-pressure rollers with forming functions set to different heating temperatures, wherein the lamination temperature of stage 1 is 70-100°C, the lamination temperature of stage 2 is 120-150°C, and the lamination temperature of stage 3 is 160-200°C. The lamination pressure is maintained constant at multiple stages, such as 5 MPa; the pressure can also be increased step by step, such as from 1 MPa at stage 1 to 3 MPa at stage 2 and then to 5 MPa at stage 3.

[0130] Example 7: Preparation of magnetic reconstituted tobacco leaf foil, the steps are as follows:

[0131] (1) Adding a binder solution to the tobacco slurry prepared according to step (1) of Example 1, and then sheeting the tobacco sheet using a standard sheeting machine; wherein the binder solution comprises a solution of a mixed natural binder such as guar gum, xanthan gum or CMC (carboxymethyl cellulose) and other agents;

[0132] (2) Preparation of magnetic coating material: vacuum-assisted filtration of nanofiber dispersion to obtain wet viscoelastic nanofiber gel; further vacuum-assisted filtration of magnetic nanowire suspension to obtain nanofiber and magnetic nanowire composite gel;

[0133] The composite gel of the mixed nanofiber dispersion and magnetic nanowire suspension is added to a mixed slurry comprising, but not limited to, tobacco mixture powder, tobacco extract, glycerin, propylene glycol, and water, and a binder solution and a surfactant are added and mixed uniformly to obtain a magnetic coating material, maintaining a solid content of 50-80%. The binder solution comprises a mixed solution of a natural binder such as guar gum, xanthan gum, or CMC (carboxymethyl cellulose) and others; the surfactant is polyvinyl pyrrolidone (PVP);

[0134] (3) coating the magnetic coating material on a tobacco sheet base and drying the coated material to obtain a magnetic tobacco sheet;

[0135] (4) performing three-stage lamination as in Example 1 to obtain magnetic reconstituted tobacco leaf sheets having a thickness of 0.10-0.30 mm;

[0136] (5) The foil prepared above is further dried by a drying device to reduce the moisture content to 5-10%, thereby obtaining a magnetic reconstituted tobacco leaf foil; and the foil is rolled, cut into sheets, or cut into shreds according to the final application requirements.

[0137] Example 8: Preparation of magnetic reconstituted tobacco leaf foil, the steps are as follows:

[0138] (1) screening one or more of wood pulp fiber, hemp pulp fiber, and tobacco fiber, crushing and defibrating them to obtain defibrated fibers; dry airflow forming the defibrated fibers to form a thin fiber layer.

[0139] (3) adding the nanofiber dispersion and the magnetic nanowire suspension into a stirring device, adding a binder solution, and stirring to obtain a magnetic slurry; the binder solution comprises a mixed natural binder such as guar gum, xanthan gum or CMC (carboxymethyl cellulose) and other solutions and a surfactant such as polyvinyl pyrrolidone (PVP); then adding plant polysaccharides, and mixing to form a magnetic coating liquid; the plant polysaccharides include but are not limited to starch, cellulose, polysaccharides, pectin, etc.;

[0140] (4) preparing wet coating materials and semi-wet coating materials, as in Example 1;

[0141] (51) The magnetic tobacco sheet obtained in step (3) is subjected to three-stage lamination at a certain temperature as in Example 1 to obtain a magnetic reconstituted tobacco sheet with a thickness of 0.10-0.30 mm;

[0142] (61) coating the wet coating material of step (4) on the magnetic reconstituted tobacco leaf base of step (51), and drying the coated material to a moisture content of 5-10 wt % to obtain a magnetic reconstituted tobacco leaf foil;

[0143] or,

[0144] (52) applying the semi-wet coating material of step (4) onto the tobacco sheet base of step (3);

[0145] (62) The tobacco sheet base coated in step (52) is subjected to three-stage lamination as in Example 1, and dried to a moisture content of 5-10 wt % to obtain a magnetic reconstituted tobacco leaf foil; the foil is rolled, cut into sheets, or cut into shreds according to the final application requirements.

[0146] The embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A magnetic reconstituted tobacco leaf, characterized in that: It includes magnetic reconstituted tobacco foil and / or magnetic reconstituted tobacco particles; the thickness of the magnetic reconstituted tobacco foil is 0.10-0.30 mm, and the particle size of the magnetic reconstituted tobacco particles is 0.5-2 mm; the magnetic reconstituted tobacco composition includes fiber material, tobacco material, nanofiber and magnetic material; the magnetic material is a material that can be converted into heat after absorbing an alternating magnetic field.

2. The magnetic reconstituted tobacco according to claim 1, characterized in that: The magnetic material is a magnetic nanomaterial, and the magnetic nanomaterial is magnetic nanoparticles and / or magnetic nanowires; the magnetic nanowires have a length of 5-100 μm and a diameter of 5-500 nm.

3. The magnetic reconstituted tobacco according to claim 1, characterized in that: The nanofibers are plant nanofibers and / or tobacco nanofibers; the nanofibers have a length of 1-10 μm and a diameter of 5-500 nm; and the fiber material is cellulose fiber and / or tobacco fiber material.

4. A method for preparing the magnetic reconstituted tobacco according to claim 1, characterized in that: The steps include: (1) preparing tobacco material and fiber material into powder with a particle size of 60-120 mesh, adding a binder and mixing to obtain a solid mixture; the binder is one or more of starch, gum arabic, xanthan gum, guar gum, CMC and / or nanofiber gel; (2) using a vacuum-assisted filtration method for nanofiber dispersion and magnetic nanowire suspension to obtain a nanofiber and magnetic nanowire composite gel; adding glycerol, water and surfactant polyvinyl pyrrolidone and mixing evenly to obtain a liquid mixture; (3) stirring and mixing the solid mixture of step (1) and the liquid mixture of step (2) to obtain a dough-like material having a water content of 20-40 wt %; (4) compressing the dough obtained in step (3) into a parison using an extruder; (5) subjecting the preform obtained in step (4) to multi-stage lamination at a certain temperature to obtain a foil having a thickness of 0.10-0.30 mm, and then drying the preform to reduce the moisture content to 5-10 wt %, thereby obtaining a reconstituted tobacco leaf foil; or, (6) The preform obtained in step (4) is crushed into irregular particles using a rotary granulator, and dried to reduce the moisture content to 1-6 wt %; and particles with a particle size of 0.5-2 mm are obtained by sieving, i.e., reconstituted tobacco leaf particles are obtained.

5. A method for preparing the magnetic reconstituted tobacco according to any one of claim 1, characterized in that: The steps include: (A) preparing a semi-wet mixture of tobacco material, nanofibers and magnetic nanomaterials; the method comprises: adding surfactants polyvinyl pyrrolidone, glycerol and propylene glycol, and using a method of continuous vacuum-assisted filtration of a nanofiber dispersion and a magnetic nanomaterial suspension to prepare a nanofiber and magnetic nanomaterial composite gel, i.e., a semi-wet mixture; (B) inserting the semi-wet mixture of step (A) into a laminating roller and performing multi-stage lamination at a certain temperature to obtain a sheet with a thickness of 0.10-0.30 mm; applying an adhesive layer to the surface of the laminating roller before the sheet base is inserted into the laminating roller; or, (C) preparing a cellulose fiber and / or tobacco fiber sheet base; (D) applying the semi-wet mixture of step (A) on the base of step (C), and then inserting the obtained base into a laminating roller for multi-stage lamination at a certain temperature to obtain a sheet with a thickness of 0.10-0.30 mm; applying an adhesive layer on the surface of the laminating roller before inserting the base into the laminating roller; The binder used in the binder layer is one or more of starch, gum arabic, xanthan gum, guar gum, CMC and / or nanofiber gel; (E) Drying the thin slice obtained in step (B) or step (D) to reduce the moisture content to 5-10wt%, thereby obtaining the magnetic laminated reconstituted tobacco leaf foil.

6. A method for preparing the magnetic reconstituted tobacco according to claim 1, characterized in that: The steps include: (a) beating tobacco material and fiber material, and then defibration to obtain tobacco pulp; (b) mixing the nanofiber dispersion and the magnetic nanowire suspension, and then adding a binder solution and a surfactant polyvinyl pyrrolidone to obtain a magnetic nanocomposite fiber slurry; (c) mixing the tobacco pulp of step (a) and the magnetic nanocomposite fiber pulp of step (b) to obtain a magnetic pulp, wherein the mass percentage of the magnetic nanocomposite fibers is 1%-5wt%; and using a sheet machine to carry out oriented arrangement and papermaking to obtain a magnetic tobacco sheet base; Alternatively, a magnetic tobacco sheet base having a core layer of magnetic nanocomposite fibers is obtained by using a sheet machine; (d) preparing wet coating material and semi-wet coating material; the steps are as follows: crushing tobacco material and fiber material to obtain uniform powder with a particle size of 60-120 mesh; then adding solid natural binder and mixing evenly; adding glycerol, propylene glycol and water to mix, maintaining the water content at 50-80wt% to obtain wet coating material; dehydrating to make the water content at 20-50wt% to obtain semi-wet coating material; the binder is one or more of starch, gum arabic, xanthan gum, guar gum, CMC and / or nanofiber gel; (e1) performing multi-stage lamination on the magnetic tobacco sheet obtained in step (c) at a certain temperature to obtain a magnetic reconstituted tobacco sheet with a thickness of 0.10-0.30 mm; (f1) coating the wet coating material of step (4) on the magnetic reconstituted tobacco leaf base obtained in step (e1), and drying to make the moisture content of the wet coating material be 5-10 wt %, thereby obtaining the magnetic reconstituted tobacco leaf foil; or, (e2) coating the semi-wet coating material of step (d) on the tobacco sheet base of step (c); (f2) performing multi-stage lamination on the tobacco sheet base coated in step (e2), and drying the sheet base to obtain a moisture content of 5-10 wt %, thereby obtaining the magnetic reconstituted tobacco leaf foil.

7. A method for preparing the magnetic reconstituted tobacco according to claim 1, characterized in that: The steps include: 1) beating tobacco material and fiber material, and then defibration to obtain tobacco pulp; 2) adding a binder solution and a surfactant polyvinyl pyrrolidone to the tobacco pulp of step 1) to mix to obtain a composite fiber pulp tobacco pulp; and using a sheet machine to sheet-form to obtain a tobacco sheet base; 3) preparing a magnetic coating material, comprising the steps of: vacuum-assisted filtration of a nanofiber dispersion and a magnetic nanowire suspension to obtain a nanofiber and magnetic nanowire composite gel; adding the obtained composite gel to a mixed slurry of tobacco mixture powder, tobacco extract, glycerin, propylene glycol and water, and then adding a binder solution, mixing uniformly to obtain a magnetic coating material, and maintaining a solid content of 50-80wt%; 4) coating the magnetic coating material of step 3) on the tobacco sheet base of step 2), and drying to obtain a magnetic tobacco sheet; 5) performing multi-stage lamination on the magnetic tobacco sheet obtained in step 4) at a certain temperature to obtain a magnetic reconstituted tobacco sheet with a thickness of 0.10-0.30 mm; 6) Drying the obtained magnetic reconstituted tobacco leaf base to make the moisture content 5-10wt% to obtain magnetic reconstituted tobacco leaf foil.

8. A method for preparing the magnetic reconstituted tobacco according to any one of claim 1, characterized in that: The steps include: (I) crushing tobacco material and fiber material to defiberize, and dry air forming the defiberized fibers to obtain a fiber thin layer; (II) mixing the nanofiber dispersion and the magnetic nanowire suspension, adding the binder solution and the surfactant polyvinyl pyrrolidone to obtain a magnetic nanocomposite fiber slurry; then adding the plant polysaccharide, and mixing Combining to form a magnetic coating liquid; (III) spraying the magnetic coating liquid of step (II) onto the fiber thin layer of step (I) and shaping it into a magnetic tobacco sheet base; (IV) preparing wet coating material and semi-wet coating material; the steps are as follows: crushing tobacco material and fiber material to obtain uniform powder with a particle size of 60-120 mesh; then adding solid natural binder and mixing evenly; adding glycerol, propylene glycol and water to mix, maintaining the water content at 50-80wt% to obtain wet coating material; dehydrating to make the water content at 20-50wt% to obtain semi-wet coating material; the binder is one or more of starch, gum arabic, xanthan gum, guar gum, CMC and / or nanofiber gel; (LI) performing multi-stage lamination on the magnetic tobacco sheet obtained in step (II) at a certain temperature to obtain a magnetic reconstituted tobacco sheet with a thickness of 0.10-0.30 mm; (LXI) coating the wet coating material of step (IV) on the magnetic reconstituted tobacco leaf base of step (LI), and drying to a moisture content of 5-10 wt % to obtain a magnetic reconstituted tobacco leaf foil; or, (LII) coating the semi-wet coating material of step (IV) on the tobacco sheet base of step (III); (LXⅡ) The tobacco sheet base coated in step (LⅡ) is subjected to multi-stage lamination at a certain temperature and dried to a moisture content of 5-10 wt% to obtain a magnetic reconstituted tobacco leaf foil.

9. The preparation method according to any one of claims 4 to 8, characterized in that: The pressure of multi-stage lamination is 1-5MPa and the temperature is 70-200℃.

10. Use of the magnetic reconstituted tobacco leaves according to any one of claims 1 to 3 as a substrate for forming a magnetic aerosol.