Magnetic paper, its preparation method and application

Abstract

The present application discloses a kind of magnetic paper, it includes base paper (12) and magnetic material (11);The magnetic material (11) is on the outer surface of base paper (12), or the magnetic material (11) is partially embedded in base paper (12), or the magnetic material (11) is completely embedded in base paper (12).The present application also discloses the preparation method and use of the magnetic paper.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of tobacco, and particularly relates to a magnetic paper, a preparation method and application thereof. BACKGROUND

[0002] The existing aerosol products usually use electromagnetic heating to atomize the required components in the aerosol forming substrate from the product to form an inhalable aerosol. In particular, the aerosol products using circumferential electromagnetic heating, the Joule heat generated by the magnetic material needs to be transmitted to the aerosol forming substrate through the material (such as paper) wrapping the aerosol forming substrate, so that the heat absorbed by the aerosol forming substrate is weakened due to the barrier effect of the wrapping material. Therefore, in order to make the aerosol forming substrate achieve the expected atomization effect, the preheating time of the product needs to be prolonged and the maximum heating temperature needs to be increased, thereby increasing the output power of the inductor. The adverse effects brought by this include low heat utilization efficiency of the aerosol forming substrate, uneven heat distribution, and increased energy consumption of the heating device for heating the aerosol product.

[0003] Therefore, the present application is proposed. SUMMARY

[0004] In order to improve the above defects, the present application provides a magnetic paper, which can be used to wrap the aerosol forming substrate and form an aerosol generating section. The magnetic material film, coating or pattern in the magnetic paper in the aerosol generating section of the aerosol product is penetrated or cut by an alternating magnetic field, and then induces eddy current to generate Joule heat, and heats the aerosol forming substrate in the aerosol product in an energy-saving and high-heat-utilization way.

[0005] The technical scheme of the present application is as follows:

[0006] The first aspect of the present application discloses a magnetic paper, which comprises base paper 12 and magnetic material 11; the magnetic material 11 is on the outer surface of the base paper 12, or the magnetic material 11 is partially embedded in the base paper 12, or the magnetic material 11 is completely embedded in the base paper 12.

[0007] Preferably, the base paper 12 contains cellulose and / or nanofiber.

[0008] Preferably, the base paper 12 contains carbon nanotubes.

[0009] Preferably, the base paper 12 contains surfactants and / or modifiers, adhesives, dispersants and flame retardants.

[0010] Preferably, the nanofiber is cellulose nanofiber, aramid nanofiber or a mixture of the two; the diameter of the nanofiber is 10-100 nanometers, and the length is 1-10 micrometers.

[0011] Preferably, the magnetic material 11 is a nanoscale ferromagnetic or ferrimagnetic material that can be converted into heat after absorbing an alternating magnetic field.

[0012] Preferably, the ferromagnetic or ferrimagnetic material is one or several of iron, iron alloy, nickel, nickel alloy.

[0013] The second aspect of the present application discloses a method for preparing the magnetic paper, comprising the steps of: coating, vacuum-assisted filtration, printing, or laser scribing the magnetic material 11 onto the base paper 12; and then drying, mechanical pressing at room temperature, or hot pressing.

[0014] Preferably, the coating is one of dip coating, spray coating, bar coating, drop coating, or spin coating; and the printing is one of screen printing, gravure printing, flexographic printing, inkjet printing, or electrohydrodynamic printing.

[0015] The third aspect of the present application discloses the use of the magnetic paper for heating an aerosol substrate to generate an aerosol.

[0016] The magnetic paper is composed of a base paper and a magnetic material, the base paper contains cellulose and / or nanocellulose (NFs) used in papermaking; the base paper can or can not contain various additives such as surfactants / modifiers, adhesives, dispersants, flame retardants, etc. The magnetic material forms a magnetic flux path on the base paper. The magnetic paper generates eddy current on its magnetic flux path, and generates heat through Joule effect.

[0017] The magnetic paper is rolled into a hollow cylindrical tube or into any other arbitrary shape. It can also be formed into a hollow cylindrical tube or any other arbitrary shape in advance, and then combined with the magnetic material. The magnetic paper can be wrapped around an aerosol-forming substrate to form an aerosol-generating segment. The magnetic paper can also be combined with the aerosol-forming substrate in other ways than wrapping to form an aerosol-generating segment. The magnetic paper can be filled with an aerosol-forming substrate to form an aerosol-generating segment. The magnetic paper can also be combined with the aerosol-forming substrate in other ways than filling the aerosol-forming substrate to form an aerosol-generating segment. The aerosol-generating segment can be used alone or in combination with other parts of an aerosol product, including a support segment, a temperature-lowering segment, and a filter segment.

[0018] The NFs are beneficial to the magnetic paper to be shaped into a desired shape with high thermal stability and mechanical strength, and thus, a base paper containing the NFs is preferred. The NFs include, but are not limited to, cellulose nanofibers (CNFs) and / or aramid nanofibers (ANFs); wherein the CNFs have the advantages of excellent mechanical strength and good compatibility with hydrophilic substrates (such as cellulose for papermaking); and the ANFs have high thermal stability, good water resistance, and excellent dielectric properties in addition to excellent mechanical properties, and are more suitable for use in electrical equipment in a high-temperature and high-humidity environment. Depending on the aerosol product processing process and the temperature and humidity requirements for use, the magnetic paper used or the CNFs or the ANFs or a mixture of the two is preferably added.

[0019] 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. For example, iron or iron alloys such as stainless steel, nickel, nickel alloys such as corrosion-resistant Fe-Ni-Cr alloys, etc. The magnetic geometry or pattern of the magnetic material in the magnetic paper or paper-based susceptor should be able to induce a continuous eddy current loop after absorbing a suitable alternating magnetic field, and have mechanical properties that are compatible with the flexible manufacturing process of paper. Due to the large specific surface area, stronger mechanical properties such as strength and toughness, excellent electrical, magnetic, and thermal properties of nanomaterials, the magnetic material can be selected as a magnetic nanomaterial such as nanoparticles, nanosheets, nanospheres, nanorods, nanotubes, nanowires, etc. In particular, ferromagnetic nanowires can be preferably used as the magnetic material available in the present application to meet the above requirements due to their high aspect ratio and excellent electromagnetic properties; the ferromagnetic nanowires include NiNWs, Co NWs, Fe-Ni NWs, Co-Ni NWs, Co-Fe NWs, Fe-Co-Ni NWs, Fe-Mo-Ni NWs, etc. The length of the nanowires is 5-100 μm, and the average diameter is 5-500 nm.

[0020] The method of applying the magnetic material to the base paper or combining the magnetic material with the pre-shaped magnetic paper includes, but is not limited to, dip coating, spray coating, rod coating, drop coating, spin coating, vacuum-assisted filtration, screen printing, gravure printing, flexographic printing, inkjet printing, electrohydrodynamic printing, hot stamping, laser scribing, etc. The method of applying the magnetic material to the base paper or combining the magnetic material with the pre-shaped magnetic paper can be a combination of one or more of the above methods.

[0021] After the magnetic material is applied to the base paper or combined with the pre-shaped magnetic paper, the available magnetic paper and the shaped magnetic paper can be obtained by post-processing such as drying, room temperature mechanical pressing, or hot pressing, etc. By selecting appropriate temperature and pressure, the magnetic material is deformed, interconnected, and welded, thereby increasing the magnetic permeability, mechanical rigidity, and induced conductivity of the magnetic paper.

[0022] The aerosol-forming substrate comprises a material capable of being atomized to form an inhalable aerosol at a suitable temperature. The aerosol formed by atomization of the aerosol-forming substrate contains an atomized agent, a flavoring substance, and / or nicotine, and can also contain other inhalable components. The aerosol-forming substrate is in the form of a solid, a semi-solid, and other forms. The aerosol-forming substrate can be made from natural raw materials (such as tobacco and / or other plant-based raw materials) or synthetic raw materials (chemically or biologically synthesized raw materials). The shape of the aerosol-forming substrate in the aerosol generating section is continuous corrugated, fragmented, long strip, filament, granular, porous or dense rod, sheet, roll, and other regular or irregular shapes.

[0023] The distribution of the magnetic material in the base paper includes three forms: (1) the magnetic material is located on the side of the base paper in contact with the aerosol-forming substrate and is completely exposed outside the base paper; (2) the magnetic material is located on the side of the base paper in contact with the aerosol-forming substrate and is partially embedded in the base paper; (3) the magnetic material is completely embedded in the base paper and does not physically contact the aerosol-forming substrate. See FIGS. 1-3. Figure 1 Accordingly, from the heating mode, the magnetic material that can physically contact the aerosol-forming substrate is called contact heating type, and the magnetic material that does not physically contact the aerosol-forming substrate is called non-contact heating type. In the contact heating type, the exposed magnetic material is in full or partial physical contact with the aerosol-forming substrate, and the Joule heat generated by the eddy current flowing through the magnetic material can be directly transferred to the aerosol-forming substrate, the heating rate is faster, the utilization efficiency of heat by the aerosol-forming substrate is higher, and at the same time, the outer side of the magnetic paper or paper-based susceptor is an insulating layer, which can protect the magnetic material. In the non-contact heating type, the magnetic material is completely embedded in the base paper to reduce the influence of external temperature and humidity, and due to the thin thickness of the magnetic paper or paper-based susceptor, it does not significantly affect the magnetic flux penetrating into the magnetic material, so it does not significantly affect the transfer of induced heat from the magnetic material to the aerosol-forming substrate. The contact heating type and the non-contact heating type of the magnetic paper are integrated with the aerosol-forming substrate to form an aerosol product; the heating mode is contact or non-contact, which can be determined according to the properties of the aerosol-forming substrate and the product, the consumption habit, and the use environment.

[0024] The magnetic material can be in the form of a thin film or a regular or irregular geometric pattern in the magnetic paper and paper-based susceptor. By adjusting the amount of application, the number of coating layers, the pattern shape size or the area fraction of the magnetic material, the hydrogen bonding between the magnetic material and cellulose, the bonding effect of cellulose on the effective dispersion of the magnetic network of the magnetic material, etc. can significantly improve the magnetic permeability of the magnetic paper and paper-based susceptor, and further improve the electrical conductivity, so as to heat to a higher temperature range under low driving voltage, to meet the energy saving demand. The temperature range is 100℃-200℃, 200℃-300℃, and above 300℃. In particular, by finely selecting one or more ferromagnetic nanowires with high magnetic permeability, low electrical resistivity and suitable Curie temperature, a desired high heating temperature can be achieved. In particular, by finely adjusting the area fraction of the magnetic material in the magnetic paper, rapid temperature rise and fall or shorter thermal response time can be achieved. The magnetic paper has long-term heating stability and stable heating / cooling cycles, which is beneficial to the aerosol forming article in each use cycle, the aerosol forming substrate does not accumulate significant heat, and releases aerosol under relatively consistent temperature conditions, to ensure the consistency of each puff when using the aerosol article.

[0025] Advantages of the present application:

[0026] The base paper 12 of the present application preferably contains NFs; the flexible nanofibers in the NFs entangle with each other, so that the NFs 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 or between fibers; on the other hand, the NFs with small size, high surface area and flexibility can naturally increase the strength of the network. Thus, the NFs can successfully improve the tensile strength of the paper. The NFs are renewable and easy to recycle. The high active hydroxyl groups in the CNFs can be modified by chemical and physical treatment to obtain the desired performance, such as increasing the adhesion between the magnetic material. The ANFs help to increase the combustible temperature of the magnetic paper or paper-based susceptor, ensuring the safety of the aerosol article at high temperature (such as >300℃, but <400℃).

[0027] The magnetic paper of the present application preferably contains ferromagnetic nanowires; the ferromagnetic nanowires have high aspect ratio and excellent mechanical properties, which have advantages for forming flexible magnetic circuit and eddy current network. It has excellent mechanical properties, thermal stability, flexibility and porosity.

[0028] The magnetic paper has the characteristics of low driving voltage, fast heating and high heating temperature, and can meet the requirements of energy saving, fast heating and instant use of aerosol products. In the constant voltage power supply mode, increasing the area fraction of magnetic material reduces the resistance of the magnetic paper, and using a magnetic paper with a smaller area can exhibit a higher saturation temperature; when the input power of the magnetic paper is constant, the temperature rise rate increases rapidly with the substantial reduction of the specific heat capacity, mass and area of the magnetic paper. Therefore, by controlling the area fraction of the magnetic material and the supply voltage and adjusting the specific heat capacity, mass and area of the magnetic paper, the corresponding induction heating performance can be adjusted.

[0029] When the magnetic paper is integrated with the aerosol-forming substrate as an aerosol product, the magnetic-thermal conversion path is shortened, and the utilization efficiency of induction heat by the aerosol-forming substrate is greatly improved, which in turn greatly reduces the energy consumption of the heating device. Moreover, since the aerosol product itself integrates the susceptor, there is no need to set an additional susceptor on the heating device outside the aerosol product, which greatly reduces the volume of the heating device, and there is no need to embed a block-shaped susceptor in the aerosol product, which reduces the manufacturing difficulty of the aerosol product. It not only saves manufacturing cost but also is beneficial to portability. Since the aerosol product can be heated to the required working temperature in a very short time, the preheating waiting time of the heating device is greatly shortened, and the product can be used immediately. Since the aerosol product can be cooled from the working temperature to room temperature in a very short time, the heat collection problem in the aerosol-forming substrate is greatly reduced, ensuring the experience consistency of the aerosol product in each use cycle.

[0030] The advantages of using ferromagnetic nanowires for the prepared magnetic paper are further illustrated as follows:

[0031] 1. The heating performance of the magnetic paper or paper-based susceptor can be easily adjusted by controlling the amount of nanowires or driving voltage: when the driving voltage is constant, the magnetic paper or paper-based susceptor with high content of ferromagnetic nanowires (such as Fe-Ni NWs) has a lower resistance and a higher heating temperature; due to the high-efficiency Fe-Ni NWs embedded structure and interconnected electromagnetic Fe-Ni NWs skeleton, a high temperature can be obtained at a lower driving voltage by moderately increasing the area fraction of Fe-Ni NWs, typically, when the area fraction of Fe-Ni NWs is 0.5 g / m 2 , the temperature can be raised to above 200°C within 10s under a driving voltage of 3V; or when the area fraction of Fe-Ni NWs is 1.0 g / m 2At this time, under the 2V driving voltage, the temperature can be raised to above 250℃ within 7s; the beneficial effect of obtaining high temperature at low driving voltage is saving electric energy and reducing energy consumption; 2, when an alternating magnetic field is applied to the magnetic paper, Joule heat is generated due to the inelastic collision between the accelerated eddy current electrons and phonons in the nanowire, so that the magnetic paper rapidly heats up, and when the alternating magnetic field is stopped to be applied to the magnetic paper, the temperature of the magnetic paper susceptor rapidly drops due to the absence of Joule heat; especially when the area of the magnetic paper is greatly reduced (such as <100cm 2 ), due to the great increase in eddy current density and power density, the heating and cooling rates will rapidly increase, and it is expected to rapidly heat up and cool down within 1s or even milliseconds. This is beneficial to the use of aerosol products, reducing the subsequent sensory changes caused by the accumulation of pre-heat in the aerosol-forming substrate. At the same time, the use experience is also improved due to the greatly shortened preheating waiting time; another beneficial effect is that the electric energy consumed by the magnetic paper to heat to the required temperature is reduced.

[0032] The present application preferably adds carbon nanotubes to the base paper. The advantages of adding carbon nanotubes are: the flexibility of carbon nanotubes, the strong binding between carbon nanotubes and cellulose, and the combined effect of the porous structure of the cellulose substrate, which can greatly reduce the applied bending strain. In addition, the strong attraction of cellulose fibers to carbon nanotubes provides high film stability against damage such as scratches and peeling. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Cross-sectional view of the distribution form of the magnetic material in the base paper; Figure 1 a is that the magnetic material is located on the surface of the base paper; Figure 1 b is that the magnetic material is partially embedded in the base paper; Figure 1 c is that the magnetic material is completely embedded in the base paper.

[0034] Figure 2 Schematic diagram of sandwich structure magnetic paper and aerosol product; Figure 2 a is a cross-sectional view of the sandwich structure magnetic paper; Figure 2 b is a vertical product cross-sectional view of the sandwich structure magnetic paper for aerosol products; Figure 2 c is a schematic diagram of the sandwich structure magnetic paper for aerosol products.

[0035] Figure 3 Thin film structure magnetic paper, aerosol generating segment and aerosol product; Figure 3 a is a thin film structure magnetic paper; Figure 3 b is an aerosol product containing a thin film structure magnetic paper, and an aerosol generating segment is obtained by wrapping an aerosol-forming substrate with a magnetic paper; Figure 3 c is an aerosol generating segment of an aerosol product containing a thin film structure magnetic paper, and the aerosol generating segment is filled into a cylinder made of a magnetic paper by filling an aerosol-forming substrate into the magnetic paper.

[0036] Figure 4 magnetic paper with magnetic geometric pattern and aerosol generating segment; Figure 4 a magnetic paper with linear magnetic geometric pattern; Figure 4 b an aerosol generating segment corresponding to the magnetic paper with thread-shaped magnetic geometric pattern, the aerosol generating segment being obtained by wrapping the aerosol-forming substrate with the magnetic paper.

[0037] Figure 5 ferromagnetic nanowire magnetic paper and aerosol product; Figure 5 a ferromagnetic nanowire magnetic paper; Figure 5 b a cylindrical aerosol product with the ferromagnetic nanowire magnetic paper wrapped thereon, wherein the ferromagnetic nanowires are located on the outer circumferential surface of the magnetic paper; Figure 5 c a cylindrical aerosol product with the ferromagnetic nanowire paper wrapped thereon, wherein the ferromagnetic nanowires are located on the inner circumferential surface of the magnetic paper.

[0038] Figure 6 magnetic paper with planar spiral magnetic pattern and aerosol product; Figure 6 a magnetic paper with planar spiral magnetic pattern; Figure 6 b a cubic box-type aerosol product with planar spiral magnetic pattern; Figure 6 c a cylindrical box-type aerosol product with planar spiral magnetic pattern.

[0039] The reference signs are: 1, magnetic paper; 11, magnetic material; 12, base paper; 13, ferromagnetic nanowire magnetic paper; 2, paper-based susceptor; 3, aerosol product; 31, aerosol generating segment; 32, aerosol-forming substrate. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions of the present application more clear, the following examples are described in detail, the examples are intended to illustrate the content of the present application, but not further limit the protection scope of the present application. The process, conditions, reagents, experimental methods, etc. are the general knowledge and common sense of the art, and the present application does not have special limitations. The experimental methods not specified in each example are usually according to the conventional conditions or according to the conditions suggested by the manufacturer. Unless otherwise specified, the meanings of all professional terms and scientific terms used in this specification are the same as those generally understood by the skilled person in the technical field to which the present application belongs. However, if there is a conflict, the present specification containing the definition shall prevail.

[0041] Example 1: Magnetic material is sprayed or spin-coated between two layers of base paper, and after applying pressure, a sandwich structure of magnetic paper is formed, which is wrapped around the aerosol-forming substrate to form an aerosol-generating segment; or the magnetic paper is wound into a cylindrical hollow paper-based susceptor, which is filled with the aerosol-forming substrate to form an aerosol-generating segment and an article. As shown in Figure 2 .

[0042] Example 2: Inkjet printing or flexographic printing is used to print one or more layers of magnetic material coating on the base paper, and after drying and / or hot pressing, a magnetic paper is formed. The aerosol-generating segment and the article are prepared in the manner of Example 1. As shown in Figure 3 .

[0043] Example 3: A method for preparing a magnetic paper based on ferromagnetic nanowires is specifically mentioned. Specifically, continuous vacuum-assisted filtration is adopted, i.e., vacuum filtration of the base paper pulp is first performed, and then vacuum filtration of the ferromagnetic nanowire (such as Fe-Ni NWs) suspension is performed. The obtained solid filtrate is hot pressed at a temperature of 80°C and a pressure of 5MPa for 1h, which can reduce the thickness of the nanowire magnetic film and significantly reduce the resistance of the film. Finally, the hot-pressed magnetic paper is further hot welded at 150°C and 1MPa pressure to reduce the contact resistance between the nanowires, forming a high-permeability magnetic paper with an Fe-Ni NWs area fraction of 0.3g / m 2 . In another embodiment, the hot-pressed magnetic paper is further hot welded at 200°C and 1MPa pressure to form another high-permeability magnetic paper with an Fe-Ni NWs area fraction of 0.5g / m 2 . The aerosol-generating segment and the article are prepared in the manner of Example 1. As shown in Figure 5 .

[0044] The Fe-Ni NWs have a length of 40-100μm and an average diameter of 30-70nm.

[0045] The advantages of the present embodiment include: (1) by continuous mechanical treatment and high-pressure homogenization for multiple times, the NFs dispersion can form a solid substrate; in particular, by adding a certain amount of ANFs in the used NFs, the ANFs are easy to form an entanglement network through hydrogen bonding by a simple vacuum-assisted filtration method, thereby obtaining a super-strong rigid nanostructure with high thermal stability and high transparency, further enhancing the high-temperature resistance and mechanical strength of the magnetic paper; the suspension can be added with a surfactant such as polyvinylpyrrolidone (PVP) wrapped Fe-Ni NWs, through the hydrogen bonding interaction between the additive and the cellulose substrate, the Fe-Ni NWs are partially embedded in the paper, the unembedded Fe-Ni NWs directly conduct the inductive heat to the aerosol-forming substrate through the mode of contact heat conduction, and the cellulose outside the paper plays a role in protecting the nanowires; the Fe-Ni NWs partially wrapped by cellulose play a role in the skeleton, promoting the load transfer and energy dissipation of the magnetic paper and the paper-based susceptor during the stretching process, dispersing the stress, and obtaining excellent mechanical properties; (2) hot pressing can further ensure the structural integrity of the NFs, the papermaking fibers and the Fe-Ni NWs, and improve the strength of the paper; (3) by further high-temperature and high-pressure treatment for simple thermal welding, the suspension components (such as PVP) wrapped around the Fe-Ni NWs can be completely removed and the Fe-Ni NWs joint can be sintered, greatly reducing the contact resistance, and constructing an interconnected, solid and stable Fe-Ni NWs magnetic flux path and eddy current network; the thermal welding also greatly improves the tensile strength of the paper, which is due to the synergistic effect of the Fe-Ni NWs structure partially embedded in the original paper and the introduction of a large number of nanowelding points, resulting in the stability and solidity of the Fe-Ni NWs skeleton, and the magnetic paper or paper-based susceptor also has good heating repeatability and uniform temperature distribution; the thermal welding can also greatly improve the heating temperature of the magnetic paper and the paper-based susceptor, because the susceptor resistance is significantly reduced after welding, resulting in an increase in the inductive eddy current and electron transmission capacity inside the susceptor; the thermal welding can improve the induction heating performance without increasing the content of Fe-Ni NWs, thereby reducing the use cost of the magnetic material.

[0046] Example 4: The ferromagnetic nanowire solution is uniformly coated on the glass substrate, and after the solvent is evaporated, the nanowires are randomly distributed to form a permeable network. The hot melt adhesive solution is spin-coated on the ferromagnetic nanowire network, and then the solvent is evaporated and the hot melt adhesive is solidified. The nanowires are embedded below the surface of the hot melt adhesive. According to the pre-designed two-dimensional CAD diagram, the nanowire / hot melt adhesive composite material is laser scribed to form the required pattern. The pattern is hot pressed at 100-200°C to transfer from the glass substrate to the base paper. The hot melt adhesive can be selected as a paper adhesive that has good wettability for ferromagnetic nanowires, so that the hot melt adhesive is well integrated into the nanowire permeable network, and the resulting nanowire / hot melt adhesive composite material can maintain excellent electromagnetic properties; the hot melt adhesive can be selected as a hot melt adhesive with excellent tensile properties, which is conducive to forming a reliable bond with the base paper; hot pressing reduces the contact resistance between the ferromagnetic nanowires, improving the inductive conductivity after hot pressing. The aerosol generating segment and the product are prepared in the manner of Example 1.

[0047] Example 5: Using screen printing technology, the magnetic material such as ferromagnetic nanowire ink is printed on the surface of the base paper or the surface of the paper tube formed by winding the base paper, and after drying, a paper-based susceptor is obtained, which is wrapped or filled with an aerosol-forming substrate to form an aerosol generating segment, which can form a three-dimensional spiral magnetic track on the inner or outer circumference of the cylindrical aerosol generating segment. The magnetic track in the aerosol generating segment couples with the alternating magnetic field applied by the solenoid inductor to generate an induced eddy current. As shown in Figure 4 .

[0048] Example 6: Using screen printing technology, the magnetic material such as ferromagnetic nanowire ink is printed on the surface of the air-permeable base paper to form a planar spiral magnetic track, and after drying, a magnetic paper is obtained, which is formed into a cuboid or cylindrical box-shaped paper-based susceptor, and filled with an aerosol-forming substrate to prepare an aerosol product. The magnetic track in the aerosol product couples with the alternating magnetic field applied by the flat inductor coil to generate an induced eddy current. As shown in Figure 6 .

[0049] Example 7: The ferromagnetic nanowires containing a certain proportion of carbon nanotubes are coated on the base paper by any of the application methods, especially the coating method, and after drying and / or mechanical pressing, a composite magnetic paper is obtained. The aerosol generating segment and the product are prepared in the manner of Example 1. The addition of carbon nanotubes can reduce the bending strain applied to the base paper and improve the stability of the coating film.

[0050] The examples are only preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. The use of magnetic paper for heating an aerosol matrix to generate aerosols, characterized in that, Includes a base paper (12) and a magnetic material (11); the magnetic material (11) is on the outer surface of the base paper (12), or the magnetic material (11) is partially embedded in the base paper (12), or the magnetic material (11) is completely embedded in the base paper (12); The base paper (12) contains nanofibers; The nanofibers are cellulose nanofibers, aramid nanofibers, or a mixture of both; the nanofibers have a diameter of 10-100 nanometers and a length of 1-10 micrometers. The magnetic material (11) is a nanoscale ferromagnetic material or a subferromagnetic material that can be converted into heat after absorbing an alternating magnetic field; The ferromagnetic material or subferromagnetic material is one or more of iron, iron alloys, nickel, and nickel alloys.

2. The use according to claim 1, characterized in that, The base paper (12) contains carbon nanotubes.

3. The use according to claim 1, characterized in that, The base paper (12) contains surfactants and / or modifiers, adhesives, dispersants and flame retardants.

4. The use according to claim 1, characterized in that, The preparation method of the magnetic paper includes the following steps: coating magnetic material (11), vacuum-assisted filtration, printing, or laser scribing onto the base paper (12); and then drying, mechanical pressing at room temperature, or hot pressing.

5. The use according to claim 4, characterized in that, The coating is one of dip coating, spray coating, rod coating, drop coating or spin coating; the printing is one of screen printing, gravure printing, flexographic printing, inkjet printing or electro-hydraulic printing.

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