WO2025107473A1 - Electromagnetic induction self-heating heating sheet, preparation method therefor, and heat-not-burn product - Google Patents

Abstract

The present application relates to an electromagnetic induction self-heating heating sheet, a preparation method therefor, a heat-not-burn product, and a heat-not-burn system. The heating sheet comprises a bearing layer, an encapsulation layer, and a plurality of induction heating films; the induction heating films are disposed on one surface of the bearing layer and extend along a first direction, and the plurality of induction heating films are arranged side by side at intervals along a second direction which is perpendicular to the first direction; and the encapsulation layer covers the induction heating films. The heating sheet can be cut into a sheet body unit, and the sheet body unit is used for wrapping an aerosol-generating substrate so as to heat the aerosol-generating substrate when the induction heating film is heated under the action of an alternating magnetic field.

Description

Electromagnetic induction self-heating heating sheet and preparation method, heating-without-burning product CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims: The application date is November 21, 2023, the application number is 202311557625.3, and the priority right of the Chinese invention patent application entitled "Electromagnetic induction self-heating heating sheet and preparation method, and heat-not-burn product"; the application date is November 21, 2023, the application number is 202323153152.9, and the priority right of the Chinese utility model patent application entitled "A heat-not-burn product"; all the above contents are incorporated herein by reference.

Technical Field

The present application relates to the field of heat-without-combustion technology, and in particular to an electromagnetic induction self-heating heating sheet and a preparation method, a heat-without-combustion product, and a heat-without-combustion system.

Background Art

Aerosol refers to a colloidal dispersion system composed of solid or liquid particles suspended in a gas medium. By heating the aerosol generating matrix, the aerosol generating matrix can produce smoke or release volatile substances without combustion, thereby forming a usable aerosol. It has been widely used in medical devices, electronic smoking devices and other fields.

At present, there are two main methods for heating the aerosol generating matrix in the form of heating without burning: resistance heating and electromagnetic induction heating. Among them, the electromagnetic induction heating method generally places a magnetic induction heating body in the aerosol generating matrix (for example, a sheet or rod-shaped heating body is inserted into the aerosol generating matrix, and a granular heating body is mixed with the aerosol generating matrix as one). The magnetic induction heating body is subjected to the action of an alternating magnetic field to generate eddy currents and generate heat, thereby achieving heating and atomization of the aerosol generating matrix.

However, since the location of the magnetic induction heating element in the aerosol generating matrix is difficult to control, and the heat generated by the magnetic induction heating element is mainly concentrated in the area centered on the magnetic induction heating element; therefore, it will not only increase the difficulty of structural combination of the magnetic induction heating element and the aerosol generating matrix, but also easily lead to the aerosol generating matrix not being heated sufficiently and evenly.

Summary of the invention

The main technical problem solved by the present application is to provide an electromagnetic induction self-heating heating sheet, a heat-not-burn product using the heating sheet, a heat-not-burn system and a method for preparing the heating sheet, which can be flexibly applied to an aerosol generating substrate and achieve uniform heating of the aerosol generating substrate.

According to a first aspect, an embodiment provides an electromagnetic induction self-heating heating sheet, comprising a carrier layer and a plurality of induction heating films, wherein the induction heating films are arranged on one side of the carrier layer along a first direction of the carrier layer, and the plurality of induction heating films are arranged side by side and spaced apart in a second direction of the carrier layer, and the induction heating films can generate heat under the action of an alternating magnetic field; the first direction and the second direction are perpendicular to each other;

The heating sheet can be cut into at least one sheet unit having a preset shape, and the sheet unit is used to wrap the aerosol generating substrate so as to heat the aerosol generating substrate and generate aerosol.

In one embodiment, the induction heating film is in the shape of a strip extending continuously in the first direction.

In one embodiment, the sheet unit can be rolled into a tubular body along the first direction; in the sheet unit, at least part of the induction heating films have different magnetic permeabilities, and/or at least part of the induction heating films have different widths and/or thicknesses.

In one embodiment, the sheet unit can be rolled into a tubular body along the first direction or the second direction; in the sheet unit, each of the induction heating films has the same length, width and magnetic permeability.

In one embodiment, the induction heating film has a plurality of induction units; the plurality of induction units are arranged at intervals in the first direction to form the induction heating film extending discontinuously on the carrier layer.

In one embodiment, the contour shape of the sensing unit is an axisymmetric figure or a centrally symmetrical figure.

In one embodiment, the contour shape of the sensing unit is one of C-shape, O-shape, X-shape and polygonal shape.

In one embodiment, the plurality of sensing units are distributed on the carrier layer in a rectangular array.

In one embodiment, at least two rows of the sensing units have different widths or thicknesses, and/or the spacing between at least two adjacent rows of the sensing units is different from the spacing between another two adjacent rows of the magnetic sensing units, and/or the magnetic permeabilities of at least two rows of the sensing units are different.

In one embodiment, the size and magnetic permeability of each of the induction units are consistent.

In one embodiment, the particle size of the particles of the induction heating film is 50nm-1μm, and the thickness of the induction heating film is 5-50μm;

And/or the supporting layer is aramid paper, carbon nanotube paper or cellulose paper with a thickness of 10-80 µm and a gram weight of 20-40 g/m2.

In one embodiment, the heating sheet further includes a packaging layer, and the packaging layer covers the induction heating film.

In one embodiment, the encapsulation layer comprises at least one material selected from the group consisting of epoxy resin, chromium, silicone oil, and ferrite.

In one embodiment, the heating sheet further includes a heat insulating layer, and the heat insulating layer is arranged to cover a side of the bearing layer away from the induction heating film.

In one embodiment, the thermal insulation layer comprises at least one material selected from the group consisting of aerogel, polysaccharide gel, diatomaceous earth, and molecular sieve, the porosity of the thermal insulation layer is greater than 65%, and the thickness of the thermal insulation layer is 10-25 μm.

In one embodiment, the sheet unit has a first area and a second area, and the induction heating film is located in the first area; wherein the sheet unit can be rolled into a tubular body, and the first area and the second area are arranged side by side in the axial direction of the tubular body.

In one embodiment, in the sheet unit, the number of the induction heating films is an odd number greater than or equal to 3.

According to a second aspect, an embodiment provides a method for preparing an electromagnetic induction self-heating heating sheet, the heating sheet comprising a bearing layer and a heat insulating layer, the bearing layer having a first surface and a second surface opposite to each other; the heat insulating layer is arranged to cover the second surface of the bearing layer; the first surface of the bearing layer is provided with a plurality of induction heating films extending along a first direction of the bearing layer and a packaging layer covering the induction heating films, the plurality of induction heating films are arranged at intervals in the second direction of the bearing layer, and the induction heating films can generate heat under the action of an alternating magnetic field; wherein the first direction is perpendicular to the second direction, and the preparation method comprises the following steps:

Applying magnetic induction slurry on the first surface of the carrier layer to form the induction heating film;

Applying encapsulation slurry on the surface of the induction heating film to form the encapsulation layer;

The heat insulation slurry is coated on the second surface of the supporting layer to form the heat insulation layer, thereby manufacturing the heating sheet.

According to the third aspect, an embodiment provides a heat-not-burn product, comprising an aerosol-generating substrate and a wrapping material layer, wherein the wrapping material layer is wrapped around the outside of the aerosol-generating substrate, and the wrapping material layer adopts the heating sheet described in the first aspect.

In one embodiment, a nozzle rod is further included, and the bearing layer extends to at least partially cover the outer circumference of the nozzle rod.

According to a fourth aspect, a heat-not-burn system comprises a heat-not-burn device and the heat-not-burn product described in the third aspect, wherein the heat-not-burn device is used to generate an alternating magnetic field so that the induction heating film generates eddy currents to heat the aerosol generating substrate.

The electromagnetic induction self-heating heating sheet according to the above-mentioned embodiment includes a bearing layer, a packaging layer and a plurality of induction heating films, wherein the induction heating film is arranged on one side of the bearing layer extending along a first direction, and the plurality of induction heating films are arranged side by side and spaced apart along a second direction perpendicular to the first direction; the packaging layer covers the induction heating film; the heating sheet can be cut into sheet units, and the sheet units are used to wrap the aerosol generating substrate, so that when the induction heating film is heated by the alternating magnetic field, the aerosol generating substrate can be heated and aerosol can be generated. By using the plurality of induction heating films arranged at intervals, a plurality of evenly distributed self-heating areas can be constructed on the heating sheet; when the heating sheet is used as a wrapping component of the aerosol generating substrate, based on the characteristic that the induction heating film can generate heat under the action of the alternating magnetic field, the aerosol generating substrate can be evenly and fully heated and atomized from the periphery of the aerosol generating substrate, and the difficulty of structural combination of the heating sheet and the aerosol generating substrate can be reduced, thereby realizing the flexible application of the heating sheet.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the structural layout of an induction heating film in a heating sheet according to an embodiment (I).

FIG. 2 is a schematic diagram of a cross-sectional structure of a heating sheet in a second direction according to an embodiment.

FIG. 3 is a schematic diagram (II) of the structural layout of an induction heating film in a heating sheet according to an embodiment.

FIG. 4 shows a partially enlarged schematic diagram (III) of the structural layout of the induction heating film in the heating sheet of an embodiment.

FIG. 5 is a schematic diagram of the functional area distribution of a heating sheet according to an embodiment (I).

FIG. 6 is a schematic diagram of the functional area distribution of a heating sheet according to an embodiment (II).

FIG. 7 is a schematic diagram of the cross-sectional structure of a heat-not-burn product according to an embodiment.

FIG8 is an enlarged schematic diagram of a partial structure of a smoke-generating section of a heat-not-burn product according to an embodiment.

FIG. 9 is a schematic diagram of an application of a heat-not-burn product according to an embodiment (I).

FIG. 10 is a schematic diagram of the structural outline of a heat-not-burn product according to an embodiment.

FIG. 11 is a schematic diagram of the cross-sectional structure of a smoke-generating section in a heat-not-burn product according to an embodiment.

FIG. 12 is a schematic diagram of the cross-sectional structure of the smoking section in FIG. 11 after the aerosol matrix.

FIG. 13 is a schematic diagram of the planar structure of a heat-not-burn product after the wrapping paper is unfolded in one embodiment (I).

FIG. 14 is a schematic diagram of the planar structure of a heat-not-burn product after the wrapping paper is unfolded (II) according to an embodiment.

FIG. 15 is a schematic diagram showing the functional area distribution of the wrapping paper in a heat-not-burn product according to an embodiment.

FIG. 16 is a schematic diagram of an application of a heat-not-burn product according to an embodiment (II).

FIG. 17 is a flow chart of a method for preparing a heating sheet according to an embodiment.

In the figure:

10. Carrying layer; 20. Induction heating film; 21. Induction unit; 30. Packaging layer; 40. Heat insulation layer; 100. Sheet unit; 101. First area; 102. Second area; 200. Aerosol generating matrix; 310. Smoking section; 320. Cooling section; 330. Filtering section; 400. Induction coil; 500. Socket.

DETAILED DESCRIPTION

The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

Please refer to Figures 1 to 6 in combination with Figures 7 to 9. The embodiments of the present application provide an electromagnetic induction self-heating heating sheet, which can be applied to heat-not-burn products (such as heat-not-burn tobacco cartridges, heat-not-burn cigarettes, etc.), and can be used as a heating component in heat-not-burn products that generates eddy currents and generates heat due to cutting the magnetic lines of force of an alternating magnetic field.

For example, the heating sheet can be cut and divided into one or more sheet units 100 with a preset shape (such as a rectangle), and the sheet unit 100 can be rolled and shaped into a tubular body, and the aerosol generating matrix 200 (such as medicinal materials, spices, tobacco, etc.) is arranged in the tube space of the tubular body, so that the heating sheet (or sheet unit 100) and the aerosol generating matrix 200 can be constructed into a heat-not-burn product; for example, the aerosol generating matrix 200 can be filled in the tubular body in the form of particles, filaments, strips, etc. after the tubular body is formed; for another example, the aerosol generating matrix 200 can also be pre-filled into a columnar smoking segment or pre-shaped into a columnar solid smoking segment, and then the sheet unit 100 is wrapped around the periphery. When the heat-not-burn product is placed in an alternating magnetic field such as provided by a heat-not-burn smoking device, the heating effect of the heating sheet can be used to heat the aerosol generating matrix 200, thereby generating an aerosol.

The following mainly takes the example of a heating sheet or sheet unit 100 in which the initial contour shape is a rectangle and the contour shape during application is a tube, and specifically describes the structural structure, application principle and technical effect of the heating sheet; however, it should be noted that the initial contour shape is a rectangle and the application contour shape is a tube is only a specific application of the heating sheet, and the heating sheet can also be set to other suitable structural forms based on actual needs by adopting appropriate process means to meet different application requirements.

Please refer to FIG. 1 to FIG. 6 , the heating sheet (ie, the sheet unit 100 ) includes a carrier layer 10 , an induction heating film 20 , a packaging layer 30 and a heat insulating layer 40 , which will be described in detail below.

Please refer to Figures 1 to 6. The supporting layer 10 can be understood as a material layer that forms the overall contour of the heating sheet. The supporting layer 10 can be used as a carrier for setting other material layers in the heating sheet, and the heating sheet can be cut into a required geometric shape (such as a rectangle) based on the supporting layer 10 and finally formed into a tubular body.

For the convenience of distinction and description, the two surfaces of the supporting layer 10 arranged opposite to each other are defined as the first surface and the second surface respectively; at the same time, two directions perpendicular to each other are defined based on the supporting layer 10, namely: the first direction and the second direction; for the heating sheet having an initial rectangular contour, one of the first direction and the second direction can be understood as the length direction of the heating sheet, and the other can be understood as the width direction of the heating sheet.

In one embodiment, the carrier layer 10 is made of aramid paper, carbon nanotube paper, cellulose paper, etc., to utilize the high thermal conductivity, high temperature resistance, stable chemical properties, high structural strength and other characteristics of such materials to create conditions for improving the performance of the heating sheet (for example, to ensure that the heating sheet has good softness and cuttability). Of course, the carrier layer 10 can also be made of other suitable materials, which will not be described in detail here.

In some embodiments, the gram weight of the carrier layer 20 can be controlled between 20 grams per square meter and 40 grams per square meter, and the thickness of the carrier layer 20 can be controlled between 10 micrometers and 80 micrometers, which is beneficial to enhance the overall lightweight of the heating sheet.

Please refer to Figures 1 to 6. When the induction heating film 20 is used in the heating sheet, it plays the role of cutting the magnetic field lines of the alternating magnetic field, thereby generating heat due to the generation of eddy currents; that is, the induction heating film 20 can be heated by the alternating magnetic field in the heating sheet. The induction heating film 20 extends along the first direction of the carrier layer 10 and is arranged on the first surface of the carrier layer 10. The number of the induction heating films 20 is set to be multiple, and the multiple induction heating films 20 are arranged side by side and spaced apart in the second direction of the carrier layer 10.

Therefore, by controlling the extension direction of the induction heating film 20 and the discontinuous arrangement between adjacent induction heating films 20, the carrier layer 10 or the heating sheet has a zebra-shaped induction heating film 20, which is not only beneficial for enhancing the uniformity of the overall heating of the heating sheet, but also can create conditions for reducing the cost of the heating sheet by reducing the material usage of the induction heating film 20.

In some embodiments, the induction heating film 20 can be made of various materials that can generate eddy current heating effect in an alternating magnetic field; for example, ferromagnetic pure metal conductor materials such as iron and their alloy conductor materials; for example, inorganic non-metallic conductor materials such as ceramics and carbon fibers that have been ferromagnetized.

In one embodiment, the induction heating film 20 is a material layer having one or more particles of carbon, iron, nickel, copper, and germanium, and the particle size of the particles is between 50 nanometers and 1 micron; wherein, in the raw material of the induction heating film 20, the shape of the particles can be selected as a strip fiber shape; and the thickness of the induction heating film 20 can be controlled between 5 microns and 50 microns.

Please refer to FIG. 2 and FIG. 8 , the encapsulation layer 30 is provided to cover the induction heating film 20, and mainly plays the role of protecting the induction heating film 20, including preventing the induction heating film 20 from accidentally separating from the carrier layer 10, and preventing the induction heating film 20 from being corroded due to exposure to aerosol, etc. The encapsulation layer 30 can be provided in a one-to-one correspondence with the induction heating film 20, that is, the encapsulation layer 30 is provided on the first surface of the carrier layer 10 in a manner of covering the corresponding induction heating film 20, or is provided to cover the surface of the corresponding induction heating film 20.

This is beneficial to reducing the material usage of the packaging layer 30 and creating conditions for achieving lightweight heating sheets; of course, the packaging layer 30 can be arranged on the first surface of the carrier layer 10 in a manner of covering the entire induction heating film 20 to achieve all-round packaging protection for the induction heating film 20.

In one embodiment, the encapsulation layer 30 can be made of one material or a combination of multiple materials such as epoxy resin, chromium, silicone oil, ferrite, etc., to utilize the characteristics of such materials to enhance the adhesion ability of the encapsulation layer 30 on the induction heating film 20 and reduce the impact on the magnetic field, thereby improving the protection effect of the induction heating film 20.

Of course, in some embodiments, the encapsulation layer 30 may also be made of other suitable materials, which will not be elaborated herein.

Please refer to FIG. 2 and FIG. 8 , the heat insulating layer 40 covers the carrier layer 10 and is arranged on the second surface of the carrier layer 10. The heat insulating layer 40 can be made of heat insulating materials with a porosity greater than 65%, such as aerogel, polysaccharide gel, diatomaceous earth, molecular sieve, etc., and the thickness of the heat insulating layer 40 can be controlled to be 10 microns to 25 microns. After the heating sheet or sheet unit 100 is wound and formed into a tubular body, the encapsulation layer 30 and the induction heating film 20 are located on the inner side of the tubular body, and the heat insulating layer 40 is equivalent to the outer surface of the tubular body.

Therefore, with the help of the heat insulation and heat preservation effect of the heat insulation layer 40, on the one hand, the heat generated by the induction heating film 20 can be concentrated in the tube body space of the tubular body, so as to fully heat and atomize the aerosol generating matrix arranged in the tube body space; on the other hand, the heat loss caused by heat transfer to the external space of the tubular body can be reduced, which can not only create favorable conditions for improving the utilization rate of thermal energy, but also avoid the impact of high surface temperature on the user experience of heat-not-burning smoking devices.

When the heating sheet or sheet unit 100 is used, it can be rolled up along the first direction or the second direction and shaped into a tubular body, so that the induction heating film 20 presents different distribution forms in the tubular body to meet different heating atomization requirements.

For example, referring to Figures 1, 3 and 4 in combination with Figure 2, the sheet unit 100 is rolled along a first direction and formed into a tubular body. At this time, each induction heating film 20 is in a ring shape surrounded along the circumference of the tubular body, and multiple induction heating films 20 are arranged in an intermittent manner in the axial direction of the tubular body.

Each annular induction heating film 20 can have the same size (for example, the same thickness in the radial direction of the tubular body and the same width in the axial direction of the tubular body) and the same magnetic permeability; when the aerosol generating matrix 200 is located in the tubular body, the aerosol generating matrix 200 can be fully and uniformly heated from the circumference of the aerosol generating matrix 200 with the help of the induction heating film 20.

Each annular induction heating film 20 may also have a different magnetic permeability or a different size. For example, at least two of the multiple annular induction heating films 20 may have different thicknesses in the radial direction of the tubular body, or different widths in the axial direction of the tubular body, or different magnetic permeabilities. By differentially setting the magnetic permeability or size of the induction heating film 20, different areas of the tubular body may have different heating temperatures, thereby achieving segmented heating and atomization of the aerosol generating matrix 200.

For example, referring to FIG. 2 in combination with FIG. 1 , FIG. 3 and FIG. 4 , the sheet unit 100 is wound along the second direction and shaped into a tubular body, at which time each induction heating film 20 is in the form of a strip extending along the axial direction of the tubular body, and multiple induction heating films 20 are arranged in an intermittent manner in the circumferential direction of the tubular body.

Each strip of the induction heating film 20 can be set to the same size (including length, width and thickness) and the same magnetic permeability, and the induction heating films 20 can also have the same spacing, which is conducive to fully and evenly heating and atomizing the aerosol generating matrix 200 from the circumference thereof.

Firstly, by using a plurality of induction heating films 20 arranged in the form of zebra patterns on the carrier layer 10, the heating sheet or sheet unit 100 has the function of automatically generating heat in an alternating magnetic field environment, and by adjusting the contour shape of the heating sheet, different usage requirements can be met; for example, the heating sheet or sheet unit 100 can be formed into a tubular shape to be used as a wrapping material (such as cigarette paper) for the aerosol generating matrix 200, and combined with the aerosol generating matrix 200 to form a heat-not-burn product that can generate aerosol.

Secondly, the use of multiple induction heating films 20 arranged at intervals can effectively increase the heating area of the aerosol generating substrate 200 or the heating area of the heating sheet itself, and the use of the thermal insulation layer 40 can constrain the heat generated by the induction heating film 20 to the geometric space surrounded by the heating sheet or sheet unit 100 (such as the tube space of a tubular body), so that the heat generated by the induction heating film 20 can be gradually and evenly transferred from the periphery of the aerosol generating substrate 200 to its center, thereby providing structural guarantee for fully and evenly heating the atomized aerosol generating substrate 200.

Thirdly, based on the selection and control of the shape and size of the heating sheet or sheet unit 100 (including the number, material and size parameters of the induction heating film 20), the heating sheet can be flexibly applied to different heating scenarios (such as uniform heating scenarios and segmented heating scenarios); at the same time, by directly wrapping the aerosol generating matrix 200 with the heating sheet or sheet unit 100, the relative position between the induction heating film 20 and the aerosol generating matrix 200 can be accurately controlled, and the difficulty of structural combination of the heating sheet and the aerosol generating matrix 200 can be reduced.

In some embodiments, the encapsulation layer 30 may also be omitted, and the thermal insulation layer 40 is arranged on the first surface of the carrier layer 10 in the form of covering the induction heating film 20. At this time, the heat generated by the induction heating film 20 can be transferred to the aerosol generating substrate 200 via the carrier layer 10, thereby achieving heating and atomization of the aerosol generating substrate 200.

In some embodiments, the heat insulation layer 40 can be omitted, and the induction heating film 20 can be adaptively arranged on the first surface and/or the second surface of the carrier layer 10; when used, the heating sheet can be directly built into the aerosol generating matrix 200, or the tubular heating sheet or sheet unit 100 can be built into the aerosol generating matrix 200; all these will not be elaborated here.

In some embodiments, the heating sheet or sheet unit 100 can be wound and shaped into a tubular body in the form of a packaging layer 30 and an induction heating film 20 located on the outside of the tubular body and a heat insulating layer 40 located on the inside of the tubular body. When used, the tubular body can be regarded as a relatively independent electromagnetic induction heating body. By inserting the tubular body into the aerosol generating matrix 200, the characteristic that the thermal field of the tubular body is evenly distributed around its geometric center line can be utilized to achieve heating and atomization of the aerosol generating matrix 200 by central heating.

In one embodiment, referring to FIG. 1 and FIG. 3 , the induction heating film 20 is configured as a rectangular strip extending continuously in the first direction, and the width of the rectangular strip (i.e., the induction heating film 20) can be controlled between 1 mm and 10 mm, and the thickness can be controlled between 5 μm and 50 μm. In the tubular body formed by the heating sheet or sheet unit 100, the number of the induction heating films 20 is set to an odd number greater than or equal to 3, such as three, five, seven or other greater odd numbers. Of course, the induction heating film 20 can also be set to other strip shapes, such as a broken line type, a curved line type, etc.

According to the principle of electromagnetic induction, an odd number of induction heating films 20 arranged at intervals along the circumference of the tubular body can play the role of triangulating the electromagnetic field lines, making the thermal field distribution of the tubular body more uniform, which is conducive to the heat generated by the induction heating film 20 being uniformly transferred from the periphery of the aerosol generating substrate 200 to the center of the aerosol generating substrate 200 step by step, thereby achieving uniform heating of the aerosol generating substrate 200. However, an even number of induction heating films 20 can easily form overlapping magnetic fields, which can easily cause the heating temperature of a local area of the tubular body to be abnormally high, which is not conducive to uniform heating of the aerosol generating substrate 200.

In one embodiment, please refer to Figure 4, the induction heating film 20 can also be configured to be a structural form that extends discontinuously and non-continuously in the first direction. For example, each induction heating film 20 can be composed of a plurality of induction units 21 arranged at intervals in the first direction; as for the induction unit 21, its contour shape can be set to an axially symmetrical figure or a centrally symmetrical figure, such as a "C" shape, an "O" shape, a circle, a regular polygon, an "X" shape, an "*" shape and other regular geometric shapes; of course, the contour shape of the induction unit 21 can also be set to other regular or irregular geometric shapes.

In one embodiment, each magnetic induction unit 21 in each induction heating film 20 or each induction unit 21 in the sheet unit 100 may be configured to have the same geometric shape.

As for the heating sheet or sheet unit 100, the induction units 21 of the multiple induction heating films 20 are equivalent to being evenly presented on the supporting layer 20 in the form of a grid distribution, thereby constructing a plurality of evenly distributed heating points or heating areas on the heating sheet or sheet unit 100; therefore, when the heating sheet or sheet unit 100 is used, uniform heating and atomization of the aerosol generating matrix 200 can also be achieved.

The applicant found that when existing heat-not-burn products (such as cigarettes) are used, they are usually installed on an aerosol generating device, so that the heating element in the device is inserted into the interior of the heat-not-burn product or wrapped around the exterior of the heat-not-burn product. Based on the principle of electromagnetic induction heating, the heat-not-burn product generates aerosol that can be used without combustion. This means that the heating element is independent of the heat-not-burn product and must have the characteristics of repeated use; on the one hand, the aerosol residue generated by the heat-not-burn product will continue to accumulate and adhere to the heating element, making it difficult to clean the heating element; on the other hand, the residue will be repeatedly heated and will also produce odor, affecting the user experience of the heat-not-burn product or device.

The heat-not-burn product provided in the present application integrates the induction heating film 20 (such as the induction unit 21) into the structural system of the heat-not-burn product, so that the heat-not-burn product has the function of self-heating and generating aerosol in an alternating magnetic field environment, which can not only avoid contamination of the aerosol generating device when the product is used, but also create conditions for reducing the structural complexity and functional configuration cost of the device. The following is a detailed description.

Please refer to Figures 7 to 8 in combination with Figures 1 to 6. An embodiment of the present application provides a heat-not-burn product, the overall contour shape of which is roughly a columnar structure with a preset length, and along the length direction of the product, it can be divided into functional sections such as a smoking section 310, a cooling section 320 and a filtering section 330 in sequence; wherein the smoking section 310 has an aerosol generating matrix 200, and at least the smoking section 310 has the heating sheet or sheet unit 100 of the aforementioned embodiment, for example, the sheet unit 100 is used as a wrapping material layer, which is wrapped around the periphery of the aerosol generating matrix 200 to form the smoking section 310.

Please refer to Figure 9. The present application also provides a heating without burning system, which includes a heating without burning device and a heating without burning product. When in use, the smoking section 310 of the heating without burning product can be placed in a structural space surrounded by an induction coil d of the heating without burning device (such as a smoking device). The alternating magnetic field environment provided by the induction coil is used to make the induction heating film 20 in the smoking section 310 generate heat due to eddy currents, thereby heating the aerosol generating matrix 200 and generating an aerosol; by inhaling the heating without burning product, the aerosol can be cooled when it flows through the cooling section 320 with the airflow, and filtered when it flows through the filtering section 330, thereby finally realizing the use of the aerosol.

It should be noted that those skilled in the art should be aware of the basic structure, working principle and structural coordination relationship between the product and the device of the heat-not-burn device; therefore, they will not be elaborated here.

In one embodiment, please refer to Figures 5 to 8, the wrapping material layer adopts a tubular body, that is, the wrapping material layer is a tubular body formed by winding the heating sheet (specifically the sheet unit 100) of the aforementioned embodiment; the sheet unit 100 has a first area 101 and a second area 102; wherein, the first area 101 can be understood as an area on the carrier layer 20 where the induction heating film 20 and the packaging layer 30 are provided, and the second area 102 can be understood as an area on the carrier layer 20 where the induction heating film 20 (or together with the packaging layer 30) is omitted; the first area 101 and the second area 102 are connected and arranged side by side in the axial direction of the tubular body. As far as the tubular body is concerned, the induction heating film 20 can be located on the inner side of the tubular body.

In some embodiments, the aerosol generating matrix 200 can be a loose non-solid medium such as medicinal materials such as wormwood, spices, tobacco shreds, tobacco leaves, tobacco particles, tobacco powder, etc.; after the sheet unit 100 is rolled and shaped into a tubular body, the aerosol generating matrix 200 is filled in the tubular space surrounded by the first area 101, thereby forming a smoking segment 310. The aerosol generating matrix 200 may also be a pre-shaped columnar structure, such as a columnar solid medium such as tobacco paste, plant paste, etc., so that the first area 101 of the sheet unit 100 is wrapped around the periphery of the aerosol generating matrix 200 to form the smoking section 310; correspondingly, the second area 102 may be at least partially wrapped around the outer peripheral surface of the cooling section 320 or even the filtering section 330, and the filtering section 330 may be formed by filling the filtering medium in the tubular space surrounded by the second area 102, or by wrapping the second area 102 of the sheet unit 100 around the periphery of the filtering medium; and the cooling section 320 may be a hollow area located between the filtering section 330 and the smoking section 310 in the tubular space surrounded by the second area 102, or may be a hollow cooling firmware located in the hollow area.

In other words, the first area 101 of the sheet unit 100 wraps the aerosol generating substrate 200 to form the smoke generating section 310 of the product, and the second area 102 of the sheet unit 100 wraps the filter medium to form the cooling section 320 and the filter section 330 of the product. Based on the structural characteristics and performance of the heating sheet, not only can the structural construction of the heat-not-burn product be simplified and its manufacturing difficulty be reduced, but also when the product is placed in an alternating magnetic field environment, the aerosol generating substrate 200 in the smoke generating section 310 can be fully and evenly heated, thereby generating and releasing aerosol.

In some embodiments, the wrapping material layer may also exist in the heat-not-burn product in other structural forms or modes to construct a product with a different structural form, or to form the product based on different manufacturing methods; for example, the sheet unit 100 does not have the second area 102, and the sheet unit 100 only wraps the aerosol generating substrate 200 and is arranged on the periphery of the aerosol generating substrate 200 to form the smoking section 310 of the product; the cooling section 320 (or the filtering section 330) of the product is connected to the smoking section 310 by a connecting piece (such as a connecting paper, a connecting tube, etc.), so as to form a heat-not-burn product; for another example, the sheet unit 100 wraps the aerosol generating substrate 200 to form a smoking structure, and wraps the outer side of the smoking structure with, for example, connecting paper to form the smoking section 310; at the same time, the cooling section 320 and the filtering section 330 of the product are wrapped with the connecting paper, or the cooling section c is connected between the smoking section 310 and the filtering section 330 with the connecting paper. All these things will not be elaborated here.

It should be noted that the induction heating film 20 and the encapsulation layer 30 are shown in Figures 2 and 8 as protruding from the surface of the carrier layer 10, which is only to schematically illustrate the approximate arrangement relationship between the relevant material layers in the heating sheet, and does not represent the specific structural form and specific size of the relevant material layers.

The embodiment of the present application also provides a heat-not-burn product, please refer to Figures 10 to 16, the heat-not-burn product can generate heat autonomously under the action of an alternating magnetic field and generate aerosol that can be used; in order to explain the structure of the heat-not-burn product more clearly and in detail, the heat-not-burn product is mainly described below with its overall outline as a columnar shape, but it should be pointed out that the heat-not-burn product can also be set to other suitable structural forms according to actual application needs.

Please refer to Figures 10 and 16. The heat-not-burn product has a smoking section 310, a hollow section 320 and a filtering section 330 sequentially distributed along its axial length direction. The combination of the hollow section 320 and the filtering section 330 can be regarded as a part of the mouthpiece to further process the aerosol generated by the smoking section. In other embodiments, the mouthpiece includes more than the hollow section 320 and the filtering section 330. For example, it can also include a supporting section, a cooling fixture, a functional section for flavoring or drying, etc. When used, the heat-not-burn product can be installed in an aerosol generating device (such as a smoking device). The smoking section 310 is mainly used to generate heat and generate aerosol under the action of the alternating magnetic field provided by the aerosol generating device; the aerosol is cooled down in the process of flowing through the hollow section 320 with the airflow, and the cooled aerosol is filtered in the process of flowing through the filtering section 330 with the airflow, so that the aerosol available for use can be output from the heat-not-burn product.

It should be noted that those skilled in the art should be aware of the basic structure and working principle of the aerosol generating device and the matching relationship between the heat-not-burn product and the aerosol generating device; for example, referring to FIG. 16 , the aerosol generating device generally includes a receiving structure for receiving the heat-not-burn product (e.g., a socket 500 that can at least receive the smoking segment 310) and a magnetic field generating device (e.g., an induction coil 400) arranged around the receiving structure; after the smoking segment 310 of the heat-not-burn product is placed in the contour space of the induction coil 400, the induction coil 400 can be used to provide an alternating magnetic field environment for the smoking segment 310, thereby causing the smoking segment 310 to heat up and generate an aerosol; therefore, the aerosol generating device and its related components will not be described in detail herein.

Please refer to Figures 11 and 12. The smoking segment 310 includes a wrapping paper (i.e., a heating sheet, specifically a sheet unit 100) and an aerosol generating matrix 200; wherein the wrapping paper includes a bearing layer 10 and a plurality of sensing units 21 having the same shape (e.g., solid or hollow O-shape, C-shape, X-shape, regular polygon, or other regular or irregular geometric shapes); wherein the bearing layer 10 is arranged to surround the outer peripheral surface of the aerosol generating matrix 200, so as to construct the outer contour structural form of the smoking segment 310 as a whole with the aid of the bearing layer 10; the sensing unit 21 plays a role in cutting the magnetic lines of force of the alternating magnetic field in the wrapping paper to generate heat due to eddy currents; and the plurality of sensing units 21 are distributed in a rectangular array on the inner surface of the bearing layer 10 (i.e., the surface of the bearing layer 10 facing the aerosol generating matrix 200).

In some embodiments, the wrapping paper (i.e., the supporting layer 10) can be pre-rolled and shaped into a tubular body, and the aerosol generating matrix 200 is filled in the tubular body in the form of particles, filaments, strips, etc., so as to construct a smoking segment 310; the aerosol generating matrix 200 can also be pre-shaped into a columnar solid form, and then the wrapping paper is wrapped around the periphery of the aerosol generating matrix 200 to form a smoking segment; that is, the aerosol generating matrix 200 can be a loose non-solid medium such as medicinal materials such as wormwood, spices, tobacco shreds, tobacco leaves, tobacco particles, tobacco powder, etc., or a solid medium such as tobacco paste and plant ointment; according to the specific form of the aerosol generating matrix 200, the wrapping paper and the aerosol generating matrix 200 are structurally combined to form the smoking segment 310.

By using a plurality of sensing units 21 arranged in a rectangular array on the inner surface of the carrier layer 10, it is equivalent to constructing a plurality of heating points or heating areas evenly arranged in a mesh form on the inner surface of the carrier layer 10 or inside the wrapping paper; thereby, not only can the uniformity of heating of the wrapping paper be improved, which is beneficial for uniformly and fully heating the atomized aerosol generating matrix 200 from the periphery of the aerosol generating matrix 200, but also the material usage of the sensing unit 21 can be reduced, creating conditions for reducing the production cost of the wrapping paper.

In one embodiment, the bearing layer 10 is made of aramid paper, carbon nanotube paper, cellulose paper, etc., and the characteristics of such materials, such as high thermal conductivity, high temperature resistance, stable chemical properties, and high structural strength, are utilized to create conditions for improving the performance of the wrapping paper (for example, facilitating the production of shaped wrapping paper, maintaining the stability of the contour of the wrapping paper, etc.). In specific implementation, the mass of the bearing layer 10 can be controlled between 20 grams per square meter and 40 grams per square meter, and the thickness of the bearing layer 10 can be controlled between 10-80µm, which is conducive to enhancing the overall lightweight of the wrapping paper. Of course, the bearing layer 10 can also be made of other suitable materials, which will not be described in detail here.

In one embodiment, the induction unit 21 can be made of various materials that can generate eddy current heating effect in an alternating magnetic field; for example, ferromagnetic pure metal conductor materials such as iron and their alloy conductor materials; for example, inorganic non-metallic conductor materials such as ceramics and carbon fibers that have been ferromagnetized. More specifically, the induction unit 21 is a material layer having one or more particles of carbon, iron, nickel, copper, and germanium, and the particle size of the particles is 50nm-1µm; wherein the particles may be in the form of strip fibers, and the thickness of the induction unit 21 may be controlled between 5-50µm.

Please refer to Figures 10, 15 and 16. The mouthpiece includes a hollow section 320, which is arranged at the proximal lip end of the smoking section 310. The mouthpiece is extended by the supporting layer 10 in a direction away from the aerosol generating substrate 200 and at least partially wrapped and covered. Therefore, the wrapping paper of the smoking section 310 also realizes the function of connecting with the mouthpiece. For example, the wrapping paper can extend to partially cover the mouthpiece, or completely cover the mouthpiece, eliminating the need for a separate rolling process of the mouthpiece. Specifically, the wrapping paper (that is, the supporting layer 10) has a first area 101 and a second area 102 arranged in the axial length direction of the heat-not-burn product. 02; wherein, the first area 101 can be understood as a structural area where the sensing unit 21 is set, and the second area 102 can be understood as a blank area where the sensing unit 21 is not set; after the wrapping paper is wrapped around the aerosol generating matrix 200, the smoking segment 310 can be formed based on the combination of the sensing unit 21 set in the first area 101 and the aerosol generating matrix 200, and the hollow segment 320 can be connected based on the second area 102, so that the smoking segment 310 and the hollow segment 320 can be connected in the process of winding to form the smoking segment 310, which saves the connection process and improves the assembly efficiency.

Correspondingly, a filter medium such as plant cellulose can be arranged in the tubular body space at one end of the hollow section 320 away from the smoking section 310, so as to form the filter section 330. In other words, the filter medium is arranged in the tubular body space surrounded by the second area 102 of the wrapping paper in a manner of maintaining a certain distance from the aerosol generating matrix 200 in the axial direction of the heat-not-burn product, so as to form the filter section 330.

Therefore, by dividing the structural area of the wrapping paper or the carrier layer 10, and selecting the regional position of the sensing unit 21 on the carrier layer 10, based on the wrapping of the aerosol generating matrix 200 and the filter medium by the wrapping paper, an integrated heat-not-burn product having a smoking section 310, a hollow section 320 and a filter section 330 can be formed, creating favorable conditions for reducing the difficulty of processing, manufacturing and forming of the heat-not-burn product.

In another embodiment, the wrapping paper may only wrap the aerosol generating matrix 200 to form the smoking segment 310, by wrapping the wrapping paper (or the smoking segment 310) with tipping paper, and utilizing the tubular space surrounded by the tipping paper to construct the hollow segment 320 and the filtering segment 330; or the smoking segment 310, the hollow segment 320 and the filtering segment 330 are relatively independent functional structural parts, and the three are connected with the help of tipping paper to form a cylindrical heat-not-burn product.

In other embodiments, with respect to heat-not-burn products, the hollow section 320 and the filter section 330 may also be omitted. In this case, breathable members (such as breathable membranes, filter membranes, etc.) may be provided at both ends of the tubular body surrounded by the wrapping paper to prevent the aerosol-generating matrix 200 from detaching from the wrapping paper.

On the one hand, the induction unit 21 is used as the heating element of the heat-not-burn product, so that the heat-not-burn product has the function of autonomously heating and generating aerosol in a magnetic field environment, thereby reducing or avoiding a series of problems caused by the independent arrangement of the heating element and the heat-not-burn product or the repeated use of the heating element; for example, the heat-not-burn product as a disposable product can reduce the pollution of the aerosol generating device caused by the accumulation of aerosol residues adhering to the inside of the aerosol generating device; for another example, there is no need to configure a heating element in the aerosol generating device, which can create favorable conditions for reducing the structural complexity of the aerosol generating device and the cost of functional configuration.

On the other hand, by using wrapping paper as a wrapping structure for the aerosol generating substrate 200, the difficulty of processing and manufacturing the heat-not-burn product can be effectively reduced, and the contact area between the wrapping paper and the aerosol generating substrate 200 can be increased; at the same time, by using a plurality of sensing units 21 evenly arranged in the form of a rectangular array in the wrapping paper, not only can a plurality of evenly distributed heating points or heating areas be formed on the periphery of the aerosol generating substrate 200 to evenly heat the aerosol generating substrate 200, but also the heat density of the wrapping paper can be increased, so that the aerosol generating substrate 200 is heated more fully.

In one embodiment, please refer to FIG. 13 and FIG. 14 , the contour shape of the sensing unit 21 in the wrapping paper can be set to a suitable shape according to actual needs; for example, the contour shape of the sensing unit 21 can be set to a square, a regular triangle or other regular polygon or an O shape (see FIG. 13 ); for another example, the sensing unit 21 can be formed by a plurality of sensing strips of equal length crossing at the same intersection, such as a "cross" or "X" shape formed by two sensing strips crossing at the same intersection (see FIG. 14 ), a "M" shape formed by three sensing strips crossing at the same intersection, etc. Of course, the sensing unit 21 can also be set to other axially symmetrical shapes or centrally symmetrical shapes.

By selecting and setting the contour shape of the induction unit 21, the uniformity and density of the distribution of the heating area or heating point in the wrapping paper can be improved, creating conditions for achieving sufficient heating and atomization of the aerosol generating matrix 200. In specific implementation, multiple induction units 21 with the same contour shape in the wrapping paper can have the same size and the same magnetic permeability; of course, the induction units 21 can also be set differently, so as to construct wrapping paper with different heating forms.

For example, the induction units 21 in the wrapping paper are arranged to have the same contour shape, and the dimensions (including contour size, thickness of material layer, etc.) of each induction unit 21 are the same and the magnetic permeability is consistent; thereby, the parameters (including heat generation, heating area, etc.) of each heating point of the wrapping paper can be made consistent; and based on the uniform matrix distribution characteristics between the multiple induction units 21, the uniformity of heat distribution of the wrapping paper can be effectively improved and the heat density can be guaranteed, so that the heat can be evenly transferred from the periphery of the aerosol generating matrix 200 to the center of the aerosol generating matrix 200, so as to fully and evenly heat the atomized aerosol generating matrix 200.

For example, the induction units 21 in the wrapping paper are arranged to have the same contour shape, but in the axial direction of the heat-not-burn product, at least two or more rows of induction units 21 have different widths or thicknesses, or at least the spacing between two adjacent rows of induction units 21 is different from the spacing between two other adjacent rows of induction units 21, or at least two rows of induction units 21 have different magnetic permeabilities. Thus, the wrapping paper can be divided into a plurality of annular heat-generating belts or annular heating zones along the axial direction of the heat-not-burn product, and the different heating values of the annular heat-generating belts can be used to achieve segmented heating of the aerosol-generating substrate 200, or the temperature of the corresponding annular heat-generating belts can be adjusted as needed to meet different needs.

It should be noted that, since the contour shape, size and magnetic permeability of the induction units 21 of the same annular heat-generating belt are the same, it can be ensured that the portion of the aerosol generating substrate 200 corresponding to each annular heat-generating belt is heated evenly and sufficiently.

In one embodiment, referring to Figures 11 to 14, in the axial direction of the heat-not-burn product, the number of rows of the sensing units 21 is set to an odd number greater than or equal to 3 (e.g., three rows, five rows, seven rows, or other odd-numbered rows); in the circumferential direction of the heat-not-burn product, the number of columns of the sensing units 21 is set to an odd number greater than or equal to 3 (e.g., three rows, five rows, seven rows, or other odd-numbered rows). By setting the number of rows and columns of the sensing units 21 to odd numbers, it is possible to avoid the formation of overlapping magnetic fields, so that the sensing units 21 can play the role of triangularly dividing the magnetic field lines of the electromagnetic field, which can make the thermal field distribution of the wrapping paper more uniform and avoid the phenomenon of abnormally high temperature in local parts of the wrapping paper.

In one embodiment, please refer to Figures 11 and 12, the wrapping paper also has a packaging layer 30, which covers the sensing unit 21 and is arranged on the inner surface side of the carrier layer 10. The packaging layer 30 mainly prevents the sensing unit 21 from separating from the carrier layer 10 and avoids the sensing unit 21 from being corroded due to exposure to aerosols. The packaging layer 30 can be made of one material or a combination of multiple materials such as epoxy resin, chromium, silicone oil, ferrite, etc. to enhance the adhesion ability of the packaging layer 30 and reduce the impact on the magnetic field.

In some embodiments, the encapsulation layer 30 can be arranged in a one-to-one correspondence with the sensing unit 21, that is, the encapsulation layer 30 is arranged on the inner surface side of the carrier layer 10 in a manner of covering the corresponding sensing unit 21. This is conducive to reducing the material usage of the encapsulation layer 30, creating conditions for achieving lightweight wrapping paper and reducing the cost of wrapping paper. The encapsulation layer 30 can also be arranged on the inner surface of the carrier layer 10 in a manner of covering all the sensing units 21 (for example, the first area 101 covering the wrapping paper is arranged on the carrier layer 10), thereby achieving all-round encapsulation protection for the sensing units 21.

In one embodiment, referring to Figures 11 and 12, the wrapping paper further has an insulating layer 40, which covers the outer surface of the supporting layer 10, for example, only the first area 101 corresponding to the wrapping paper covers the outer surface of the supporting layer 10, or the first area 101 and the second area 102 cover the entire outer surface of the supporting layer 10; in specific implementation, the insulating layer 40 can be made of at least one insulating material with a porosity greater than 65%, such as aerogel, polysaccharide gel, diatomaceous earth, molecular sieve, etc., and the thickness of the insulating layer 40 can be controlled between 10-25µm.

With the help of the thermal insulation layer 40, on the one hand, the heat generated by the sensing unit 21 can be confined to the tube space of the wrapping paper to fully heat the aerosol generating matrix 200; on the other hand, the heat loss caused by heat transfer to the outside of the heat-not-burning product can be reduced, thereby improving the utilization rate of heat; at the same time, it can also prevent heat from being transferred to the aerosol generating device, causing the device to be too hot and affecting the user experience.

It should be noted that the sensing unit 21 and the packaging layer 30 are shown in Figures 11 and 12 in a manner of protruding from the surface of the supporting layer 10, which is only for schematically illustrating the approximate arrangement relationship between the relevant material layers in the wrapping paper or cigarette paper, and does not represent the specific structural form and specific size of the relevant material layers.

The embodiment of the present application also provides a method for preparing a heating sheet, which is used to make the electromagnetic induction self-heating heating sheet (ie, wrapping paper) of the aforementioned embodiment; please refer to FIG. 17 , the preparation method includes steps 1000 to 4000.

Step 1000, preparing coating slurry.

For example, one or more particles of carbon, iron, nickel, copper and germanium with a particle size of 50 nanometers to 1 micron are configured to form a magnetic induction slurry (the particles can be in the form of strip fibers); one or more materials such as epoxy resin, chromium, silicone oil, ferrite, etc. are configured to form a packaging slurry; aerogel, polysaccharide gel, diatomaceous earth, molecular sieve, etc. with a porosity greater than 65% are configured to form a thermal insulation slurry.

Step 2000 , forming an induction heating film 20 on the carrier layer 10 .

For example, according to the contour shape of the induction heating film 20 and the arrangement on the carrier layer 10, the magnetic induction slurry is coated on the surface of aramid paper (or carbon nanotube paper, cellulose paper, etc.) with a gram weight of 20-40 grams per square meter and a thickness of 10-80 microns by film transfer, calendering or printing, thereby forming the induction heating film 20 on the first surface of the carrier layer 10; in specific implementation, the thickness of the magnetic induction slurry or the induction heating film 20 can be controlled at 5-50 microns.

Step 3000 , forming a packaging layer 30 on the induction heating film 20 .

For example, the encapsulation slurry is cumulatively coated on the induction heating film 20 by film transfer, calendaring or printing, so as to form the encapsulation layer 30. In some embodiments, the encapsulation slurry can be coated on each induction heating film 20 one by one; the encapsulation slurry can also be coated on the first surface of the carrier layer 30 so that the formed encapsulation layer 30 covers all the induction heating films 20.

Step 4000 , forming a heat insulation layer 40 on the carrier layer 10 .

For example, the heat insulating slurry is coated on the second surface of the carrier layer 10 by film transfer, calendaring or printing, so as to form a heat insulating layer 40 covering the second surface of the carrier layer 10 on the carrier layer 10. In some embodiments, the thickness of the heat insulating slurry or the heat insulating layer 40 can be controlled between 10 and 25 microns. In this way, a heating sheet with electromagnetic induction self-heating function can be finally obtained.

Claims (21)

An electromagnetic induction self-heating heating sheet, characterized in that it comprises a bearing layer and a plurality of induction heating films, wherein the induction heating films are arranged on one side of the bearing layer along a first direction of the bearing layer, and the plurality of induction heating films are arranged side by side and spaced apart in a second direction of the bearing layer, and the induction heating films can generate heat under the action of an alternating magnetic field; the first direction and the second direction are perpendicular to each other; The heating sheet can be cut into at least one sheet unit having a preset shape, and the sheet unit is used to wrap the aerosol generating substrate so as to heat the aerosol generating substrate and generate aerosol. The heating sheet according to claim 1 is characterized in that the induction heating film is in the form of a strip extending continuously in the first direction. The heating sheet as described in claim 2 is characterized in that the sheet unit can be rolled into a tubular body along the first direction; in the sheet unit, at least part of the induction heating film has different magnetic permeabilities, and/or at least part of the induction heating film has different widths and/or thicknesses. The heating sheet as described in claim 2 is characterized in that the sheet unit can be rolled into a tubular body along the first direction or the second direction; in the sheet unit, each of the induction heating films has the same length, width and magnetic permeability. The heating sheet as described in claim 1 is characterized in that the induction heating film has a plurality of induction units; the plurality of induction units are arranged at intervals in the first direction to form the induction heating film that extends discontinuously on the carrier layer. The heating sheet according to claim 5 is characterized in that the contour shape of the sensing unit is an axially symmetrical figure or a centrally symmetrical figure. The heating sheet according to claim 6, characterized in that the contour shape of the sensing unit is one of a C-shape, an O-shape, an X-shape and a polygon. The heating sheet according to claim 5, characterized in that the plurality of sensing units are distributed on the supporting layer in a rectangular array. The heating sheet as described in claim 5 is characterized in that at least two rows of the sensing units have different widths or thicknesses, and/or the spacing between at least two adjacent rows of the sensing units is different from the spacing between other two adjacent rows of the magnetic sensing units, and/or the magnetic permeabilities of at least two rows of the sensing units are different. The heating sheet according to claim 5, characterized in that the size and magnetic permeability of each of the induction units are consistent. The heating sheet according to claim 1, characterized in that the particle size of the particles of the induction heating film is 50nm-1μm, and the thickness of the induction heating film is 5-50μm; And/or the supporting layer is aramid paper, carbon nanotube paper or cellulose paper with a thickness of 10-80 µm and a gram weight of 20-40 g/m2. The heating sheet as described in claim 1 is characterized in that the heating sheet also includes a packaging layer, and the packaging layer covers the induction heating film. The heating sheet according to claim 12, characterized in that the encapsulation layer comprises at least one material selected from the group consisting of epoxy resin, chromium, silicone oil, and ferrite. The heating sheet as described in claim 1 is characterized in that the heating sheet further comprises a heat insulation layer, and the heat insulation layer is arranged to cover a side of the bearing layer away from the induction heating film. The heating sheet as described in claim 14 is characterized in that the thermal insulation layer has at least one material selected from the group consisting of aerogel, polysaccharide gel, diatomaceous earth, and molecular sieve, the porosity of the thermal insulation layer is greater than 65%, and the thickness of the thermal insulation layer is 10-25 μm. The heating sheet as described in claim 1 is characterized in that the sheet unit has a first area and a second area, and the induction heating film is located in the first area; wherein the sheet unit can be rolled into a tubular body, and the first area and the second area are arranged side by side in the axial direction of the tubular body. The heating sheet according to any one of claims 1 to 16, characterized in that in the sheet unit, the number of the induction heating films is an odd number greater than or equal to 3. A method for preparing an electromagnetic induction self-heating heating sheet, characterized in that the heating sheet comprises a bearing layer and a heat insulating layer, the bearing layer having a first surface and a second surface opposite to each other; the heat insulating layer is arranged to cover the second surface of the bearing layer; the first surface of the bearing layer is provided with a plurality of induction heating films extending along a first direction of the bearing layer and a packaging layer covering the induction heating films, the plurality of induction heating films are arranged at intervals in the second direction of the bearing layer, and the induction heating films can generate heat under the action of an alternating magnetic field; wherein the first direction is perpendicular to the second direction, and the preparation method comprises the following steps: Applying magnetic induction slurry on the first surface of the carrier layer to form the induction heating film; Applying encapsulation slurry on the surface of the induction heating film to form the encapsulation layer; The heat insulation slurry is coated on the second surface of the supporting layer to form the heat insulation layer, thereby manufacturing the heating sheet. A heat-not-burn product, characterized in that it comprises an aerosol generating substrate and a wrapping material layer, wherein the wrapping material layer is wrapped around the outside of the aerosol generating substrate, and the wrapping material layer is made of the heating sheet described in any one of claims 1-17. The heat-not-burn product according to claim 19, further comprising a mouth rod, wherein the bearing layer extends to at least partially cover the outer peripheral surface of the mouth rod. A heat-not-burn system, characterized in that it comprises a heat-not-burn device and the heat-not-burn product according to claim 19 or 20, wherein the heat-not-burn device is used to generate an alternating magnetic field so that the induction heating film generates eddy currents to heat the aerosol generating substrate.