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

Abstract

This application relates to an electromagnetically induced self-heating heating sheet and a preparation method therefor, a heat-not-burn article, and a heat-not-burn system. The heating sheet includes a carrier layer, an encapsulation layer, and a plurality of induction heating films. The induction heating films extend in a first direction to be disposed on one surface of the carrier layer, and the plurality of induction heating films are arranged side by side at intervals in a second direction perpendicular to the first direction. The encapsulation layer covers the induction heating film. The heating sheet can be cut into a sheet unit, and the sheet unit is configured to wrap an aerosol-generating substrate, to heat the aerosol-generating substrate when the induction heating film generates heat under action of an alternating magnetic field.

Description

CROSS-REFERENCE OF RELATED APPLICATIONS

[0001] This application claims priority to Chinese Patent Application No. 202311557625.3, filed on November 21, 2023 and entitled "ELECTROMAGNETICALLY INDUCED SELF-HEATING HEATING SHEET AND PREPARATION METHOD THEREFOR, AND HEAT-NOT-BURN ARTICLE"; and priority to Chinese Utility Model Patent Application No. 202323153152.9, filed on November 21, 2023 and entitled "HEAT-NOT-BURN ARTICLE". All the above content is incorporated herein by reference.TECHNICAL FIELD

[0002] This application relates to the field of heat-not-burn technology, and more specifically, to an electromagnetically induced self-heating heating sheet and a preparation method therefor, a heat-not-burn article, and a heat-not-burn system.BACKGROUND

[0003] Aerosol refers to a colloid dispersion system including solid or liquid particles suspended in a gas medium. An aerosol-generating substrate is heated, so that the aerosol-generating substrate generates vapor or releases volatile substances without burning, thereby forming usable aerosol. This is widely used in fields such as a medical apparatus and an electronic smoking set.

[0004] Currently, there are mainly two methods for heating the aerosol-generating substrate in a heat-not-burn form: resistive heating and electromagnetically induced heating. Generally, in the electromagnetically induced heating manner, a magnetic induction heating element is inserted into the aerosol-generating substrate (for example, a sheet-shaped or rod-shaped heating element is inserted into the aerosol-generating substrate, and for another example, a particle-shaped heating element is mixed with the aerosol-generating substrate), and the magnetic induction heating element is subjected to action of an alternating magnetic field to generate an eddy current and generate heat, thereby heating and atomizing the aerosol-generating substrate.

[0005] However, because it is difficult to control a location for disposing the magnetic induction heating element in the aerosol-generating substrate, heat generated by the magnetic induction heating element is mainly concentrated in a region centered on the magnetic induction heating element. Consequently, this not only increases a difficulty in a structural combination of the magnetic induction heating element and the aerosol-generating substrate, but also makes it easy to cause a case that the aerosol-generating substrate cannot be sufficiently and uniformly heated.SUMMARY

[0006] A technical problem that is mainly resolved in this application is to provide an electromagnetically induced self-heating heating sheet, a heat-not-burn article that uses 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 implement uniform heating of the aerosol-generating substrate.

[0007] According to a first aspect, an embodiment provides an electromagnetically induced self-heating heating sheet, including a carrier layer and a plurality of induction heating films. The induction heating film extends in a first direction of the carrier layer to be disposed on one surface of the carrier layer, the plurality of induction heating films are arranged side by side at intervals in a second direction of the carrier layer, and the induction heating film is capable of generating heat under action of an alternating magnetic field, and the first direction is perpendicular to the second direction.

[0008] The heating sheet is capable of being cut into at least one sheet unit with a preset shape, and the sheet unit is configured to wrap an aerosol-generating substrate, to be capable of heating the aerosol-generating substrate to generate aerosol.

[0009] In an embodiment, the induction heating film is in a strip shape extending continuously in the first direction.

[0010] In an embodiment, the sheet unit is capable of being wound into a tubular body in the first direction; and in the sheet unit, at least some of the induction heating films have different magnetic permeability, and / or at least some of the induction heating films have different widths and / or thicknesses.

[0011] In an embodiment, the sheet unit is capable of being wound into a tubular body in the first direction or the second direction; and in the sheet unit, the induction heating films have a same length, width, and magnetic permeability.

[0012] In an embodiment, the induction heating film has a plurality of induction units, and the plurality of induction units are arranged at intervals in the first direction, to form the intermittently extending induction heating film on the carrier layer.

[0013] In an embodiment, a contour shape of the induction unit is an axisymmetric figure or a centrosymmetric figure.

[0014] In an embodiment, the contour shape of the induction unit is one of a C-shape, an O-shape, an X-shape, and a polygon.

[0015] In an embodiment, the plurality of induction units are distributed in a rectangular array on the carrier layer.

[0016] In an embodiment, at least two rows of the induction units have different widths or thicknesses, and / or a spacing between at least two adjacent rows of the induction units is different from a spacing between another two adjacent rows of the induction units, and / or at least two rows of the induction units have different magnetic permeability.

[0017] In an embodiment, sizes and magnetic permeability of the induction units are consistent.

[0018] In an embodiment, a particle size of a particle of the induction heating film is 50 nm to 1 µm, and a thickness of the induction heating film is 5 µm to 50 µm; and / or the carrier layer is aramid paper, carbon nanotube paper, or cellulose paper having a thickness of 10 µm to 80 µm and a grammage of 20 to 40 grams per square meter.

[0019] In an embodiment, the heating sheet further includes an encapsulation layer, and the encapsulation layer covers the induction heating film.

[0020] In an embodiment, the encapsulation layer has at least one material of epoxy resin, chromium, silicone oil, and ferrite.

[0021] In an embodiment, the heating sheet further includes a heat insulating layer, and the heat insulating layer covers a surface of the carrier layer away from the induction heating film.

[0022] In an embodiment, the heat insulating layer has at least one material of aerogel, polysaccharide gel, diatomaceous earth, and a molecular sieve, a porosity of the heat insulating layer is greater than 65%, and a thickness of the heat insulating layer is 10 µm to 25 µm.

[0023] In an embodiment, the sheet unit has a first region and a second region, and the induction heating film is located in the first region; and the sheet unit is capable of being wound into a tubular body, and the first region and the second region are arranged side by side in an axial direction of the tubular body.

[0024] In an embodiment, in the sheet unit, a quantity of the induction heating films is an odd number greater than or equal to 3.

[0025] According to a second aspect, an embodiment provides a method for preparing an electromagnetically induced self-heating heating sheet. The heating sheet includes a carrier layer and a heat insulating layer, and the carrier layer has a first surface and a second surface that are opposite to each other; the heat insulating layer covers the second surface of the carrier layer; a plurality of induction heating films extending in a first direction of the carrier layer and an encapsulation layer covering the induction heating films are disposed on the first surface of the carrier layer, the plurality of induction heating films are arranged at intervals in a second direction of the carrier layer, and the induction heating films are capable of generating heat under action of an alternating magnetic field; and the first direction is perpendicular to the second direction. The preparation method includes the following steps: coating the first surface of the carrier layer with a magnetic induction slurry to form the induction heating film; coating a surface of the induction heating film with an encapsulation slurry to form the encapsulation layer; and coating the second surface of the carrier layer with a heat insulating slurry to form the heat insulating layer, to obtain the heating sheet.

[0026] According to a third aspect, an embodiment provides a heat-not-burn article, including an aerosol-generating substrate and a wrapping material layer. The wrapping material layer wraps an outer side of the aerosol-generating substrate, and the wrapping material layer uses the heating sheet according to the first aspect.

[0027] In an embodiment, the heat-not-burn article further includes a mouthpiece, where the carrier layer extends to at least partially cover an outer peripheral surface of the mouthpiece.

[0028] According to a fourth aspect, a heat-not-burn system is provided, and includes a heat-not-burn apparatus and the heat-not-burn article according to the third aspect. The heat-not-burn apparatus is configured to generate an alternating magnetic field, so that the induction heating film generates an eddy current to heat the aerosol-generating substrate.

[0029] The electromagnetically induced self-heating heating sheet according to the foregoing embodiment includes a carrier layer, an encapsulation layer, and a plurality of induction heating films. The induction heating film extends in a first direction to be disposed on one surface of the carrier layer, and the plurality of induction heating films are arranged side by side at intervals in a second direction perpendicular to the first direction. The encapsulation layer covers the induction heating film. The heating sheet is capable of being cut into a sheet unit, and the sheet unit is configured to wrap an aerosol-generating substrate, to be capable of heating the aerosol-generating substrate to generate aerosol when the induction heating film generates heat under action of an alternating magnetic field. The plurality of induction heating films arranged at intervals may be used to form a plurality of self-heating regions that are uniformly distributed on the heating sheet. When the heating sheet is used as a component wrapping the aerosol-generating substrate, based on a characteristic that the induction heating film can generate heat under action of an alternating magnetic field, not only the aerosol-generating substrate can be uniformly and sufficiently heated and atomized from an outer periphery of the aerosol-generating substrate, but also a difficulty in a structural combination of the heating sheet and the aerosol-generating substrate can be reduced, thereby implementing flexible application of the heating sheet.BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1 is a schematic diagram (1) of a structural layout of induction heating films in a heating sheet according to an embodiment; 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 (2) of a structural layout of induction heating films in a heating sheet according to an embodiment; FIG. 4 is a schematic diagram (3) of a locally enlarged structural layout of induction heating films in a heating sheet according to an embodiment; FIG. 5 is a schematic diagram (1) of functional region distribution of a heating sheet according to an embodiment; FIG. 6 is a schematic diagram (2) of functional region distribution of a heating sheet according to an embodiment; FIG. 7 is a schematic diagram of a cross-sectional structure of a heat-not-burn article according to an embodiment; FIG. 8 is a schematic diagram of an enlarged local structure of an aerosol-generating section of a heat-not-burn article according to an embodiment; FIG. 9 is a schematic diagram (1) of application of a heat-not-burn article according to an embodiment; FIG. 10 is a schematic diagram of a structural contour of a heat-not-burn article according to an embodiment; FIG. 11 is a schematic diagram of a cross-sectional structure of an aerosol-generating section of a heat-not-burn article according to an embodiment; FIG. 12 is a schematic diagram of a cross-sectional structure of the aerosol-generating section in FIG. 11 from which an aerosol substrate is omitted; FIG. 13 is a schematic diagram (1) of a plane structure obtained after wrapping paper in a heat-not-burn article is expanded according to an embodiment; FIG. 14 is a schematic diagram (2) of a plane structure obtained after wrapping paper in a heat-not-burn article is expanded according to an embodiment; FIG. 15 is a schematic diagram of functional region distribution of wrapping paper in a heat-not-burn article according to an embodiment; FIG. 16 is a schematic diagram (2) of application of a heat-not-burn article according to an embodiment; and FIG. 17 is a flowchart of a method for preparing a heating sheet according to an embodiment.

[0031] In the accompanying drawings: 10. carrier layer; 20. induction heating film; 21. induction unit; 30. encapsulation layer; 40. heat insulating layer; 100. sheet unit; 101. first region; 102. second region; 200. aerosol-generating substrate; 310. aerosol-generating section; 320. cooling section; 330. filtering section; 400. induction coil; and 500. insertion hole.DESCRIPTION OF EMBODIMENTS

[0032] The following further describes this application in detail through specific implementations with reference to the accompanying drawings. Associated and similar reference numerals are used for similar elements in different implementations. In the following implementations, many details are described so that this application can be better understood. However, persons skilled in the art may readily recognize that some of the features may be omitted in different cases, or may be replaced by another element, material, or method. In some cases, some operations related to this application are not shown or described in the specification to avoid obscuring a core part of this application with excessive description. For persons skilled in the art, a detailed description of the related operations is not necessary, and they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0033] In addition, the characteristics, operations, or features described in the specification may be combined in any proper manner to form various implementations. In addition, steps or actions in the method descriptions may also be sequentially switched or adjusted in a manner obvious to persons skilled in the art. Therefore, the sequences in the specification and the accompanying drawings are merely intended to clearly describe an embodiment, and do not mean necessary sequences unless otherwise stated that a sequence needs to be followed.

[0034] Numbers numbered for components in this specification, such as "first" and "second", are only used for distinguishing described objects, and do not have any sequence or technical meaning. The terms "connected" and "coupled" described in this application, unless otherwise specified, include both direct and indirect connections (or couplings).

[0035] Referring to FIG. 1 to FIG. 6 and with reference to FIG. 7 to FIG. 9, an embodiment of this application provides an electromagnetically induced self-heating heating sheet, which may be applied to a heat-not-burn article (for example, a heat-not-burn cartridge or a heat-not-burn cigarette), and is used as a heating component that is in the heat-not-burn article and that generates an eddy current and generates heat because the heating sheet cuts a magnetic line of force of an alternating magnetic field.

[0036] For example, the heating sheet may be cut into one or more sheet units 100 with a preset shape (for example, a rectangle), and the sheet unit 100 may be wound and shaped into a tubular body. An aerosol-generating substrate 200 (for example, medicinal herbs, spices, or tobacco) is disposed in tube space of the tubular body, so that the heating sheet (or the sheet unit 100) and the aerosol-generating substrate 200 can form a heat-not-burn article. For example, the aerosol-generating substrate 200 may be filled in the tubular body in a form of particles, shreds, strips, or the like after the tubular body is shaped. For another example, the aerosol-generating substrate 200 may alternatively be pre-filled as a columnar aerosol-generating section or pre-shaped as a columnar solid aerosol-generating section and then is wrapped with the sheet unit 100 on an outer periphery. When the heat-not-burn article is placed in an alternating magnetic field provided by a heat-not-burn smoking set, a heating effect of the heating sheet may be used to heat the aerosol-generating substrate 200 to generate aerosol.

[0037] An example in which an initial contour shape of the heating sheet or the sheet unit 100 is a rectangle, and a contour shape in application is a tubular shape is mainly used below to specifically describe structural composition, an application principle, a technical effect, and the like of the heating sheet. However, it should be noted that the initial contour shape being a rectangle and the contour shape in application being a tubular shape is only a specific application of the heating sheet, and the heating sheet may alternatively be set to another proper structure form based on an actual requirement by using a proper process method, to meet different application requirements.

[0038] Referring to FIG. 1 to FIG. 6, the heating sheet (that is, the sheet unit 100) includes a carrier layer 10, an induction heating film 20, an encapsulation layer 30, and a heat insulating layer 40. Specific description is provided below.

[0039] Referring to FIG. 1 to FIG. 6, the carrier layer 10 may be understood as a material layer that forms an overall contour shape of the heating sheet. The carrier layer 10 may be used as a setting carrier of another material layer in the heating sheet, or the heating sheet may be cut into a required geometric shape (for example, a rectangle) based on the carrier layer 10, and be finally shaped into a tubular body.

[0040] For ease of differentiation and description, two surfaces of the carrier layer 10 that are disposed opposite to each other are respectively defined as a first surface and a second surface. In addition, two mutually perpendicular directions are defined based on the carrier layer 10: a first direction and a second direction. For a heating sheet having a rectangular initial contour shape, one of the first direction and the second direction may be understood as a length direction of the heating sheet, and the other may be understood as a width direction of the heating sheet.

[0041] In an embodiment, the carrier layer 10 uses aramid paper, carbon nanotube paper, cellulose paper, or the like, to use characteristics of this type of material such as high thermal conductivity, temperature resistance, stable chemical performance, and high structural strength, thereby creating a condition for improving performance of the heating sheet (for example, ensuring that the heating sheet has good softness and cutability). Certainly, the carrier layer 10 may alternatively use another proper material, and details are not described herein.

[0042] In some embodiments, a grammage of the carrier layer 20 may be controlled to range from 20 grams per square meter to 40 grams per square meter, and a thickness of the carrier layer 20 may be controlled to range from 10 microns to 80 microns, thereby facilitating overall lightening of the heating sheet.

[0043] Referring to FIG. 1 to FIG. 6, during application of the heating sheet, the induction heating film 20 provides a function of cutting a magnetic line of force of an alternating magnetic field to generate heat due to generation of an eddy current. In other words, the induction heating film 20 can generate heat in the heating sheet under action of an alternating magnetic field. The induction heating film 20 extends in the first direction of the carrier layer 10 to be disposed on the first surface of the carrier layer 10. In addition, a plurality of induction heating films 20 are disposed, and the plurality of induction heating films 20 are arranged side by side at intervals in the second direction of the carrier layer 10.

[0044] Therefore, through an extension direction of the induction heating film 20 and a characteristic of a discontinuous arrangement of adjacent induction heating films 20, the carrier layer 10 or the heating sheet has zebra-shaped induction heating films 20, which not only helps to enhance overall heating uniformity of the heating sheet, but also may create, by reducing a quantity of materials used for the induction heating film 20, a condition for reducing costs of the heating sheet.

[0045] In some embodiments, the induction heating film 20 may use various materials capable of generating an eddy current heating effect in an alternating magnetic field, for example, a ferromagnetic pure metal conductor material such as iron and an alloy conductor material of the ferromagnetic pure metal conductor material; and for another example, an inorganic non-metal conductor material such as a ceramic or carbon fiber on which ferromagnetization processing is performed.

[0046] In an embodiment, the induction heating film 20 is a material layer that has one or more particles of carbon, iron, nickel, copper, and germanium and at which a particle size of the particle is 50 nanometers to 1 micron. In a raw material of the induction heating film 20, a shape of the particle may be a strip-shaped fiber form, and a thickness of the induction heating film 20 may be controlled to range from 5 microns to 50 microns.

[0047] Referring to FIG. 2 and with reference to FIG. 8, the encapsulation layer 30 covers the induction heating film 20, and mainly provides a function of protecting the induction heating film 20, including preventing the induction heating film 20 from accidentally leaving the carrier layer 10 and avoiding corrosion of the induction heating film 20 due to exposure to aerosol. The encapsulation layer 30 may be disposed in one-to-one correspondence with the induction heating film 20. To be specific, the encapsulation layer 30 is disposed on the first surface of the carrier layer 10 in a manner of covering a corresponding induction heating film 20, or covers a surface of the corresponding induction heating film 20.

[0048] Therefore, it is helpful to reduce a quantity of materials used for the encapsulation layer 30, thereby creating a condition for implementing lightening of the heating sheet. Certainly, the encapsulation layer 30 may be disposed on the first surface of the carrier layer 10 in a manner of covering all the induction heating films 20, to implement omni-directional encapsulation protection on the induction heating films 20.

[0049] In an embodiment, the encapsulation layer 30 may use one or a combination of a plurality of materials of epoxy resin, chromium, silicone oil, ferrite, and the like, to use characteristics of this type of material to enhance an attaching capability of the encapsulation layer 30 on the induction heating film 20 and reduce impact on a magnetic field, thereby improving a protection effect on the induction heating film 20.

[0050] Certainly, in some embodiments, the encapsulation layer 30 may alternatively use another proper material, and details are not described herein.

[0051] Referring to FIG. 2 and with reference to FIG. 8, the heat insulating layer 40 covers the carrier layer 10 and is disposed on the second surface of the carrier layer 10. The heat insulating layer 40 may use a heat insulating material with a porosity greater than 65%, such as aerogel, polysaccharide gel, diatomaceous earth, or a molecular sieve. A thickness of the heat insulating layer 40 may be controlled to range from 10 microns to 25 microns. After the heating sheet or the sheet unit 100 is wound and shaped into a tubular body, the encapsulation layer 30 and the induction heating film 20 are located on an inner side of the tubular body, and the heat insulating layer 40 is equivalent to an outer surface of the tubular body.

[0052] In this way, through a heat insulating function provided by the heat insulating layer 40, in one aspect, heat generated by the induction heating film 20 can be accumulated in tube space of the tubular body, to sufficiently heat and atomize an aerosol-generating substrate disposed in the tube space, and in another aspect, heat loss caused by heat transfer to outer space of the tubular body can be reduced, which can not only create a favorable condition for improving heat energy utilization, but also avoid affecting use experience of a heat-not-burn smoking set or the like due to an excessively high surface temperature.

[0053] During application of the heating sheet or the sheet unit 100, the heating sheet or the sheet unit 100 may be wound in the first direction or the second direction and shaped into a tubular body, so that the induction heating films 20 are in different distribution forms in the tubular body, to meet different heating and atomization requirements.

[0054] For example, referring to FIG. 1, FIG. 3, and FIG. 4, and with reference to FIG. 2, the sheet unit 100 is wound in the first direction and shaped into a tubular body. In this case, each induction heating film 20 is in an annular shape enclosed in a circumferential direction of the tubular body, and the plurality of induction heating films 20 are in a form of arrangement at intervals in an axial direction of the tubular body.

[0055] The annular induction heating films 20 may have a same size (for example, have a same thickness in a radial direction of the tubular body and a same width in the axial direction of the tubular body) and have same magnetic permeability. When the aerosol-generating substrate 200 is located in the tubular body, the aerosol-generating substrate 200 may be sufficiently and uniformly heated in a circumferential direction of the aerosol-generating substrate 200 by using the induction heating film 20.

[0056] The annular induction heating films 20 may alternatively have different magnetic permeability or different sizes. For example, at least two of the plurality of annular induction heating films 20 have different thicknesses in the radial direction of the tubular body, or have different widths in the axial direction of the tubular body, or have different magnetic permeability. By setting different magnetic permeability or sizes of the induction heating films 20, different regions of the tubular body may have different heating temperatures, to perform segmented heating and atomization on the aerosol-generating substrate 200.

[0057] For example, referring to FIG. 2 and with reference to FIG. 1, FIG. 3, and FIG. 4, the sheet unit 100 is wound in the second direction and shaped into a tubular body. In this case, each induction heating film 20 is in a strip shape arranged extending in an axial direction of the tubular body, and the plurality of induction heating films 20 are in a form of arrangement at intervals in a circumferential direction of the tubular body.

[0058] A same size (including a length, a width, and a thickness) and same magnetic permeability may be set for the strip-shaped induction heating films 20, and a same spacing may also exist between the induction heating films 20, which helps to sufficiently and uniformly heat and atomize the aerosol-generating substrate 200 in a circumferential direction of the aerosol-generating substrate 200.

[0059] First, the plurality of induction heating films 20 arranged on the carrier layer 10 in a form of a zebra stripe are used to enable the heating sheet or the sheet unit 100 to have a function of automatically generating heat in an alternating magnetic field environment, and a contour shape of the heating sheet is adjusted to meet different use requirements. For example, the heating sheet or the sheet unit 100 may be shaped into a tubular shape, to be used as a wrapping object (such as cigarette paper) of the aerosol-generating substrate 200, and be combined with the aerosol-generating substrate 200 to form a heat-not-burn article capable of generating aerosol.

[0060] Second, the plurality of induction heating films 20 arranged at intervals may be used to effectively enlarge a heated area of the aerosol-generating substrate 200 or a heating area of the heating sheet, and the heat insulating layer 40 may be used to limit heat generated by the induction heating film 20 to geometric space (for example, tube space of a tubular body) enclosed by the heating sheet or the sheet unit 100, so that the heat generated by the induction heating film 20 can be gradually and uniformly transferred to a center of the aerosol-generating substrate 200 from an outer periphery of the aerosol-generating substrate 200, thereby providing a structure guarantee for sufficiently and uniformly heating and atomizing the aerosol-generating substrate 200.

[0061] Third, based on selection and control of a shape size (including a quantity, a material, and a size parameter of the induction heating film 20) of the heating sheet or the sheet unit 100, the heating sheet can be flexibly applied to different heating scenarios (for example, a uniform heating scenario or a segmented heating scenario). In addition, the aerosol-generating substrate 200 is directly wrapped by using the heating sheet or the sheet unit 100, so that a relative location between the induction heating film 20 and the aerosol-generating substrate 200 can be precisely controlled, and a difficulty in a structural combination of the heating sheet and the aerosol-generating substrate 200 can be reduced.

[0062] In some embodiments, the encapsulation layer 30 may alternatively be omitted. The heat insulating layer 40 is disposed on the first surface of the carrier layer 10 in a manner of covering the induction heating film 20. In this case, heat generated by the induction heating film 20 may be transferred to the aerosol-generating substrate 200 through the carrier layer 10, to heat and atomize the aerosol-generating substrate 200.

[0063] In some embodiments, the heat insulating layer 40 may alternatively be omitted, and the induction heating film 20 may be adaptively disposed on the first surface and / or the second surface of the carrier layer 10. In application, the heating sheet may be directly disposed inside the aerosol-generating substrate 200, or the heating sheet or the sheet unit 100 in a tubular form may be disposed inside the aerosol-generating substrate 200. All these are not described in detail herein.

[0064] In some embodiments, the heating sheet or the sheet unit 100 may be wound and shaped into a tubular body in a form in which the encapsulation layer 30 and the induction heating film 20 are located on an outer side of the tubular body and the heat insulating layer 40 is located on an inner side of the tubular body. In application, the tubular body may be considered as a relatively independent electromagnetically induced heating element. By inserting the tubular body into the aerosol-generating substrate 200, the aerosol-generating substrate 200 may be heated and atomized in a central heating manner by using a characteristic that a heat field of the tubular body is uniformly distributed around a geometric center line of the tubular body.

[0065] In an embodiment, referring to FIG. 1 and FIG. 3, the induction heating film 20 is disposed as a rectangular strip continuously extending in the first direction. A width of the rectangular strip (that is, the induction heating film 20) may be controlled to range from 1 mm to 10 mm, and a thickness may be controlled to range from 5 microns to 50 microns. In a tubular body shaped for the heating sheet or the sheet unit 100, a quantity of induction heating films 20 is set to be an odd number greater than or equal to 3, for example, three, five, seven, or more other odd-numbered quantity. Certainly, the induction heating film 20 may alternatively be disposed in another strip-shaped pattern, for example, a bent line type or a curved line type.

[0066] According to an electromagnetic induction principle, an odd-numbered quantity of induction heating films 20 disposed at intervals in a circumferential direction of a tubular body may provide a function of performing triangular segmentation on a magnetic line of force of an electromagnetic field, so that heat field distribution of the tubular body is more uniform, which helps to uniformly and gradually transfer, from an outer periphery of the aerosol-generating substrate 200 to a center of the aerosol-generating substrate 200, heat generated by the induction heating films 20, thereby uniformly heating the aerosol-generating substrate 200. It is very easy for an even-numbered quantity of induction heating films 20 to form an overlapping magnetic field. As a result, it is easy to cause a heating temperature in a local region of the tubular body excessively high, which is not conducive to uniformly heating the aerosol-generating substrate 200.

[0067] In an embodiment, referring to FIG. 4, the induction heating film 20 may alternatively be disposed to be in a structure form that discontinuously and intermittently extends in the first direction. For example, each induction heating film 20 may be formed by combining a plurality of induction units 21 arranged at intervals in the first direction. A contour shape of the induction unit 21 may be set to an axisymmetric figure or a centrosymmetric figure, for example, a regular geometric shape such as a "C" shape, an "O" shape, a circle, a regular polygon, an "X" shape, or an "*" shape. Certainly, the contour shape of the induction unit 21 may also be set to another regular or irregular geometric shape.

[0068] In an embodiment, magnetic induction units 21 in each induction heating film 20 or induction units 21 in the sheet unit 100 may be set to have a same geometric shape.

[0069] For the heating sheet or the sheet unit 100, the induction units 21 of the plurality of induction heating films 20 are equivalent to being uniformly presented on the carrier layer 20 in a form of dot distribution, so that a plurality of heating points or heating regions that are uniformly distributed are formed on the heating sheet or the sheet unit 100. Therefore, uniform heating and atomization of the aerosol-generating substrate 200 may also be implemented during application of the heating sheet or the sheet unit 100.

[0070] The applicant finds that, during use of an existing heat-not-burn article (for example, a cigarette), the existing heat-not-burn article is usually installed on an aerosol-generating apparatus, so that a heating element in the apparatus is inserted inside the heat-not-burn article or is wrapped around an outside of the heat-not-burn article. Based on a principle of electromagnetically induced heating, the heat-not-burn article generates usable aerosol without burning. This means that the heating element is independent of the heat-not-burn article and needs to have a characteristic of being repeatedly used. In one aspect, aerosol residues generated by the heat-not-burn article are constantly accumulated and attached to the heating element, which makes it difficult to clean the heating element. In another aspect, repeated heating of the residues also causes a peculiar smell, which affects use experience of the heat-not-burn article or apparatus.

[0071] According to a heat-not-burn article provided in this application, the induction heating film 20 (for example, the induction unit 21) is integrated into a structural system of the heat-not-burn article, so that the heat-not-burn article has a function of performing self-heating and generating aerosol in an alternating magnetic field environment, which can not only prevent an aerosol-generating apparatus from being contaminated during application of the article, but also create a condition for reducing structural complexity of the apparatus and function configuration costs. Specific description is provided below.

[0072] Referring to FIG. 7 and FIG. 8 and with reference to FIG. 1 to FIG. 6, an embodiment of this application provides a heat-not-burn article. An overall contour shape of the article is approximately a columnar structure having a preset length, and the article may be successively divided into functional sections such as an aerosol-generating section 310, a cooling section 320, and a filtering section 330 in a length direction of the article. The aerosol-generating section 310 has an aerosol-generating substrate 200, and at least the aerosol-generating section 310 has the heating sheet or the sheet unit 100 in the foregoing embodiment. For example, the sheet unit 100 is used as a wrapping material layer, and wraps around an outer periphery of the aerosol-generating substrate 200, to form the aerosol-generating section 310.

[0073] Referring to FIG. 9, this application further provides a heat-not-burn system. The heat-not-burn system includes a heat-not-burn apparatus and the heat-not-burn article. During application, the aerosol-generating section 310 of the heat-not-burn article may be placed in structural space enclosed by an induction coil d of the heat-not-burn apparatus (for example, a smoking set), and an alternating magnetic field environment provided by the induction coil is used to cause the induction heating film 20 in the aerosol-generating section 310 to generate heat due to generation of an eddy current, thereby heating the aerosol-generating substrate 200 to generate aerosol. By sucking the heat-not-burn article, the aerosol can be cooled when flowing through the cooling section 320 along with airflow, and be filtered when flowing through the filtering section 330 along with the airflow, thereby finally implementing use of the aerosol.

[0074] It should be noted that persons skilled in the art should know a basic structure and working principle of the heat-not-burn apparatus, and a structural cooperation relationship between the article and the apparatus. Therefore, details are not described herein.

[0075] In an embodiment, referring to FIG. 5 to FIG. 8, a tubular body is used as a wrapping material layer, that is, the wrapping material layer is a tubular body shaped by winding the heating sheet (specifically, the sheet unit 100) in the foregoing embodiment. The sheet unit 100 has a first region 101 and a second region 102. The first region 101 may be understood as a region in which the induction heating film 20 and the encapsulation layer 30 are disposed on the carrier layer 20, and the second region 102 may be understood as a region in which the induction heating film 20 (or together with the encapsulation layer 30) is omitted on the carrier layer 20. The first region 101 and the second region 102 are arranged side by side in an axial direction of the tubular body. For the tubular body, the induction heating film 20 may be located on an inner side of the tubular body.

[0076] In some embodiments, the aerosol-generating substrate 200 may be medicinal herbs such as mugwort, or loose and non-solid media such as spices, tobacco shreds, tobacco leaves, tobacco particles, or tobacco powder. After the sheet unit 100 shaped into a tubular body through winding, the aerosol-generating substrate 200 is filled in tube space enclosed by the first region 101, to form the aerosol-generating section 310. The aerosol-generating substrate 200 may alternatively be a pre-shaped columnar structure, for example, a columnar solid medium such as tobacco paste or plant-based paste, so that the first region 101 of the sheet unit 100 wraps an outer periphery of the aerosol-generating substrate 200, to form the aerosol-generating section 310. Correspondingly, the second region 102 may at least partially wrap the cooling section 320 or even an outer peripheral surface of the filtering section 330, and the filtering section 330 may be formed by filling a filtering medium in a tube space enclosed by the second region 102, or may be formed after the second region 102 of the sheet unit 100 wraps an outer periphery of the filtering medium. The cooling section 320 may be a hollow region located between the filtering section 330 and the aerosol-generating section 310 in the tube space enclosed by the second region 102, and may also include a hollow cooling component located in the hollow region.

[0077] In other words, the first region 101 of the sheet unit 100 wraps the aerosol-generating substrate 200 to form the aerosol-generating section 310 of the article, the second region 102 of the sheet unit 100 wraps the filtering medium and the like to form the cooling section 320 and the filtering section 330 of the article. Based on a structural characteristic and performance of the heating sheet, structural composition of the heat-not-burn article can be simplified and manufacturing difficulty of the heat-not-burn article can be reduced. In addition, when the article is placed in an alternating magnetic field environment, the aerosol-generating substrate 200 in the aerosol-generating section 310 can be sufficiently and uniformly heated, to generate and release aerosol.

[0078] In some embodiments, the wrapping material layer may alternatively exist in other structure forms or manners in the heat-not-burn article, to construct articles in different structure forms, or the article is manufactured based on different manufacturing methods. For example, the sheet unit 100 does not have the second region 102, and the sheet unit 100 wraps only the aerosol-generating substrate 200, and is disposed on an outer periphery of the aerosol-generating substrate 200, to form the aerosol-generating section 310 of the article. The cooling section 320 (or the filtering section 330) and the aerosol-generating section 310 of the article are connected through a connecting member (for example, connecting paper or a connecting tube), to manufacture the heat-not-burn article. For another example, the sheet unit 100 wraps the aerosol-generating substrate 200 to form an aerosol-generating structure body, and wraps, for example, connecting paper, on an outer side of the aerosol-generating structure body to form an aerosol-generating section 310. In addition, the cooling section 320 and the filtering section 330 of the article are wrapped through the connecting paper, or the cooling section c is connected between the aerosol-generating section 310 and the filtering section 330 through the connecting paper. All these are not described in detail herein.

[0079] It should be noted that, in FIG. 2 and FIG. 8, the induction heating film 20 and the encapsulation layer 30 are shown in a manner of protruding from a surface of the carrier layer 10. This is merely used to show an example of a rough arrangement relationship between related material layers in the heating sheet, and does not represent specific structure forms and specific sizes of the related material layers.

[0080] An embodiment of this application further provides a heat-not-burn article. Referring to FIG. 10 to FIG. 16, the heat-not-burn article can autonomously generate heat under action of an alternating magnetic field and generate usable aerosol. To describe a structure of the heat-not-burn article in more detail, the heat-not-burn article is mainly described below by using an example in which an overall contour form of the heat-not-burn article is columnar. However, it should be noted that the heat-not-burn article may alternatively be set to another proper structure form based on an actual application requirement.

[0081] Referring to FIG. 10 and FIG. 16, the heat-not-burn article has an aerosol-generating section 310, a hollow section 320, and a filtering section 330 that are sequentially distributed in an axial length direction of the heat-not-burn article. A combination of the hollow section 320 and the filtering section 330 may be considered as a part of a mouthpiece, to further process aerosol generated by the aerosol-generating section. In another embodiment, the mouthpiece includes not only the hollow section 320 and the filtering section 330. For example, the mouthpiece may further include a support section, a cooling component, a functional section for fragrance enhancement or drying, and the like. In application, the heat-not-burn article may be installed in an aerosol-generating apparatus (for example, a smoking set). The aerosol-generating section 310 is mainly configured to generate heat under action of an alternating magnetic field provided by the aerosol-generating apparatus, and generate aerosol. The aerosol is cooled in a process of flowing through the hollow section 320 along with airflow, and the cooled aerosol is filtered in a process of flowing through the filtering section 330 along with the airflow, so that usable aerosol can be output from the heat-not-burn article.

[0082] It should be noted that persons skilled in the art should know a basic structure and working principle of the aerosol-generating apparatus and a cooperation relationship between the heat-not-burn article and the aerosol-generating apparatus. For example, referring to FIG. 16, the aerosol-generating apparatus usually includes an accommodating structure (for example, an insertion hole 500 that can at least accommodate the aerosol-generating section 310) and a magnetic field generation device (for example, an induction coil 400) arranged around the accommodating structure. After the aerosol-generating section 310 of the heat-not-burn article is placed in contour space of the induction coil 400, the induction coil 400 may be used to provide an alternating magnetic field environment for the aerosol-generating section 310, thereby causing the aerosol-generating section 310 to generate heat to generate aerosol. Therefore, the aerosol-generating apparatus and related parts thereof are not described in detail herein.

[0083] Referring to FIG. 11 and FIG. 12, the aerosol-generating section 310 includes wrapping paper (that is, the heating sheet, which is specifically the sheet unit 100) and an aerosol-generating substrate 200. The wrapping paper includes a carrier layer 10 and a plurality of induction units 21 having a same shape (for example, regular or irregular geometric shapes such as a solid or hollow O-shape, a C-shape, an X-shape, and a regular polygon). The carrier layer 10 is disposed around an outer peripheral surface of the aerosol-generating substrate 200, to form an overall outer contour structure form of the aerosol-generating section 310 by using the carrier layer 10. The induction unit 21 provides a function of cutting a magnetic line of force of an alternating magnetic field in the wrapping paper, to generate heat due to generation of an eddy current. The plurality of induction units 21 are distributed in a rectangular array on an inner surface of the carrier layer 10 (that is, a surface on a side that is of the carrier layer 10 and that faces the aerosol-generating substrate 200).

[0084] In some embodiments, the wrapping paper (that is, the carrier layer 10) may be pre-wound and shaped into a tubular body, and the aerosol-generating substrate 200 is filled in the tubular body in a form of particles, shreds, strips, and the like, to form the aerosol-generating section 310. The aerosol-generating substrate 200 may alternatively be pre-shaped into a columnar solid form, and then the wrapping paper is wrapped around an outer periphery of the aerosol-generating substrate 200 to form the aerosol-generating section. To be specific, the aerosol-generating substrate 200 may be medicinal herbs such as mugwort, or loose and non-solid media such as spices, tobacco shreds; or may be solid media such as tobacco paste or plant-based paste. Based on a specific form of the aerosol-generating substrate 200, the wrapping paper and the aerosol-generating substrate 200 are structurally combined to form the aerosol-generating section 310.

[0085] Using a plurality of induction units 21 disposed on the inner surface of the carrier layer 10 in a form of a rectangular array is equivalent to constructing, on the inner surface of the carrier layer 10 or inside the wrapping paper, a plurality of heating points or heating regions that are uniformly arranged in a form of a mesh shape. Therefore, heating uniformity of the wrapping paper can be improved, which helps to uniformly and sufficiently heat and atomize the aerosol-generating substrate 200 from an outer periphery of the aerosol-generating substrate 200. In addition, a quantity of materials used for the induction unit 21 can be reduced, thereby creating a condition for reducing manufacturing costs of the wrapping paper.

[0086] In an embodiment, the carrier layer 10 uses aramid paper, carbon nanotube paper, cellulose paper, or the like, to use characteristics of this type of material such as high thermal conductivity, temperature resistance, stable chemical performance, and high structural strength, thereby creating a condition for improving performance of the wrapping paper (for example, facilitating manufacturing and shaping of the wrapping paper, and maintaining stability of a contour form of the wrapping paper). In specific implementation, mass of the carrier layer 10 may be controlled to range from 20 grams per square meter to 40 grams per square meter, and a thickness of the carrier layer 10 may be controlled to range from 10 µm to 80 µm, thereby facilitating overall lightening of the wrapping paper. Certainly, the carrier layer 10 may alternatively use another proper material, and details are not described herein.

[0087] In an embodiment, the induction unit 21 may use various materials capable of generating an eddy current heating effect in an alternating magnetic field, for example, a ferromagnetic pure metal conductor material such as iron and an alloy conductor material of the ferromagnetic pure metal conductor material; and for another example, an inorganic non-metal conductor material such as a ceramic or carbon fiber on which ferromagnetization processing is performed. More specifically, the induction unit 21 is a material layer that has one or more particles of carbon, iron, nickel, copper, and germanium and at which a particle size of the particle is 50 nm to 1 µm. A shape of the particle may be a strip-shaped fiber form, and a thickness of the induction unit 21 may be controlled between 5 µm to 50 µm.

[0088] Referring to FIG. 10, FIG. 15, and FIG. 16, the mouthpiece includes a hollow section 320, and the hollow section 320 is disposed at a near-lip end of the aerosol-generating section 310. The mouthpiece extends from the carrier layer 10 in a direction away from the aerosol-generating substrate 200 and is at least partially wrapped and covered. Therefore, the wrapping paper of the aerosol-generating section 310 further implements a function of connecting to the mouthpiece. For example, the wrapping paper may extend to partially cover the mouthpiece, or may completely cover the mouthpiece, thereby omitting a process of separately rolling the mouthpiece. Specifically, the wrapping paper (that is, the carrier layer 10) has a first region 101 and a second region 102 arranged in the axial length direction of the heat-not-burn article. The first region 101 may be understood as a structural region in which the induction unit 21 is disposed, and the second region 102 may be understood as a blank region in which the induction unit 21 is not disposed. After the wrapping paper wraps the aerosol-generating substrate 200 through winding, the aerosol-generating section 310 may be formed based on a combination of the induction unit 21 disposed in the first region 101 and the aerosol-generating substrate 200, and the hollow section 320 may be connected based on the second region 102. Therefore, in a process of forming the aerosol-generating section 310 through winding, the aerosol-generating section 310 and the hollow section 320 can be connected, thereby reducing connection operations and improving assembly efficiency.

[0089] Correspondingly, a filtering medium such as plant cellulose may be disposed in tube space that is of the hollow section 320 and that is away from the aerosol-generating section 310, to form the filtering section 330. To be specific, the filtering medium is disposed, in a manner of keeping a specific distance from the aerosol-generating substrate 200 in the axial direction of the heat-not-burn article, in the tube space enclosed by the second region 102 of the wrapping paper, to form the filtering section 330.

[0090] Therefore, through division of structural regions of the wrapping paper or the carrier layer 10, and selection of a region location of the induction unit 21 on the carrier layer 10, an integral heat-not-burn article having the aerosol-generating section 310, the hollow section 320, and the filtering section 330 may be formed based on wrapping of the aerosol-generating substrate 200 and the filtering medium by the wrapping paper, thereby creating a favorable condition for reducing a difficulty in processing, manufacturing, and shaping the heat-not-burn article.

[0091] In another embodiment, the wrapping paper may alternatively wrap only the aerosol-generating substrate 200 to form the aerosol-generating section 310. Connecting paper is wrapped on an outer periphery of the wrapping paper (or the aerosol-generating section 310), and tube space enclosed by the connecting paper is used to form the hollow section 320 and the filtering section 330. Alternatively, the aerosol-generating section 310, the hollow section 320, and the filtering section 330 are functional structural members relatively independent of each other, and the aerosol-generating section 310, the hollow section 320, and the filtering section 330 are connected through connecting paper or the like to form a heat-not-burn article in a columnar shape.

[0092] In another embodiment, the hollow section 320 and the filtering section 330 may alternatively be omitted from the heat-not-burn article. In this case, a breathable member (for example, a breathable film, or a filtering film) may be disposed at both ends of a tubular body enclosed by the wrapping paper, and the aerosol-generating substrate 200 is prevented, by using the breathable member, from leaving the wrapping paper.

[0093] In one aspect, the disposed induction unit 21 is used as a heating element of the heat-not-burn article, so that the heat-not-burn article has a function of autonomously generating heat and generating aerosol in a magnetic field environment, thereby reducing or avoiding a series of problems caused by separate disposing of the heating element and the heat-not-burn article or repeated use of the heating element. For example, the heat-not-burn article, serving as a disposable product, can reduce contamination of an aerosol generating apparatus caused by accumulation and attaching of aerosol residues to the inside of the aerosol generating apparatus. For another example, a heating element does not need to be configured in the aerosol-generating apparatus, which may create a favorable condition for reducing structural complexity of the aerosol-generating apparatus and function configuration costs.

[0094] In another aspect, the wrapping paper is used as a wrapping structure of the aerosol-generating substrate 200, which can not only effectively reduce a difficulty of processing and manufacturing the heat-not-burn article, but also enlarge a contact area between the wrapping paper and the aerosol-generating substrate 200. In addition, the plurality of induction units 21 uniformly arranged in the wrapping paper in a form of a rectangular array are used to not only form, on an outer periphery of the aerosol-generating substrate 200, a plurality of uniformly distributed heating points or heating regions, to uniformly heat the aerosol-generating substrate 200, but also improve heat density of the wrapping paper, so that the aerosol-generating substrate 200 is heated more sufficiently.

[0095] In an embodiment, referring to FIG. 13 and FIG. 14, a contour shape of the induction unit 21 in the wrapping paper may be set to a proper shape based on an actual requirement. For example, the contour shape of the induction unit 21 may be set to a square, a regular polygon such as a regular triangle, or an O-shape (refer to FIG. 13). For another example, the induction unit 21 may be in a shape formed by a plurality of induction strips with an equal edge length crossing at a same intersection point, for example, a cross shape ("+" shape) or an "X" shape (refer to FIG. 14) formed by two induction strips crossing at a same intersection point, or a star shape ("" shape) formed by three induction strips crossing at a same intersection point. Certainly, the induction unit 21 may alternatively be disposed into another axisymmetric figure or a centrosymmetric figure.

[0096] Through selective setting of the contour shape of the induction unit 21, uniformity and density of distribution of heating regions or heating points in the wrapping paper can be improved, thereby creating a condition for sufficiently heating and atomizing the aerosol-generating substrate 200. In specific implementation, a plurality of induction units 21 with a same contour shape in the wrapping paper may have a same size and same magnetic permeability. Certainly, the induction units 21 may alternatively be set differently, to form wrapping paper in different heating forms.

[0097] For example, the induction units 21 in the wrapping paper are set to a same contour shape, and sizes (including a contour size and a thickness of a material layer) of the induction units 21 are the same, and magnetic permeability of the induction units 21 is consistent. In this way, parameters (including a heating amount and a heating area) of heating points in the wrapping paper may tend to be consistent. Based on a characteristic of uniform matrix distribution between the plurality of induction units 21, heat distribution uniformity of the wrapping paper can be effectively improved and heat density can be ensured, so that heat can be uniformly and gradually transferred from an outer periphery of the aerosol-generating substrate 200 to a center of the aerosol-generating substrate 200, to sufficiently and uniformly heat and atomize the aerosol-generating substrate 200.

[0098] For example, the induction units 21 in the wrapping paper are set to a same contour shape. However, in the axial direction of the heat-not-burn article, at least two or more rows of induction units 21 have different widths or thicknesses, or a spacing between at least two adjacent rows of induction units 21 is different from a spacing between another two adjacent rows of induction units 21, or at least two rows of induction units 21 have different magnetic permeability. In this way, the wrapping paper may be divided into a plurality of annular heating strips or annular heating regions in the axial direction of the heat-not-burn article, and segmented heating of the aerosol-generating substrate 200 is implemented by using different amounts of heat generated by the annular heating strips, or a temperature of a corresponding annular heating strip is adjusted based on a requirement, to meet different requirements.

[0099] It should be noted that, because contour shapes, sizes, and magnetic permeability of induction units 21 in a same annular heating strip are the same, it can be ensured that a part that is of the aerosol-generating substrate 200 and that corresponds to each annular heating strip is sufficiently and uniformly heated.

[0100] In an embodiment, referring to FIG. 11 to FIG. 14, in the axial direction of the heat-not-burn article, a quantity of rows of the induction unit 21 is set to an odd number greater than or equal to 3 (for example, three rows, five rows, seven rows, or more other odd-numbered quantity of rows). In the circumferential direction of the heat-not-burn article, a quantity of columns of the induction unit 21 is set to an odd number greater than or equal to 3 (for example, three rows, five rows, seven rows, or more other odd-numbered quantity of rows). The quantity of rows and the quantity of columns of the induction unit 21 are set to an odd number, to avoid forming an overlapping magnetic field, so that the induction unit 21 can provide a function of performing triangular segmentation on a magnetic line of force of an electromagnetic field. In this way, heat field distribution of the wrapping paper can be more uniform, to avoid a phenomenon that a temperature in a local part of the wrapping paper is abnormally excessively high.

[0101] In an embodiment, referring to FIG. 11 and FIG. 12, the wrapping paper further has an encapsulation layer 30. The encapsulation layer 30 is disposed on an inner surface side of the carrier layer 10 in a manner of covering the induction unit 21, and mainly provides functions of preventing the induction unit 21 from leaving the carrier layer 10, avoiding corrosion of the induction unit 21 due to exposure to aerosol, and the like. The encapsulation layer 30 may use one or a combination of a plurality of materials of epoxy resin, chromium, silicone oil, ferrite, and the like, to enhance an attachment capability of the encapsulation layer 30 and reduce impact on a magnetic field.

[0102] In some embodiments, the encapsulation layer 30 may be disposed in one-to-one correspondence with the induction unit 21. To be specific, the encapsulation layer 30 is disposed on the inner surface side of the carrier layer 10 in a manner of covering a corresponding induction unit 21. This helps to reduce a quantity of materials used for the encapsulation layer 30, thereby creating a condition for implementing lightness of the wrapping paper and reducing costs of the wrapping paper. The encapsulation layer 30 may alternatively be disposed on an inner surface of the carrier layer 10 in a manner of covering all the induction units 21 (for example, disposed on the carrier layer 10 in a manner of covering the first region 101 of the wrapping paper), to implement omni-directional encapsulation protection on the induction units 21.

[0103] In an embodiment, referring to FIG. 11 and FIG. 12, the wrapping paper further has a heat insulating layer 40. The heat insulating layer 40 covers an outer surface of the carrier layer 10. For example, the heat insulating layer 40 covers, only corresponding to the first region 101 of the wrapping paper, the outer surface of the carrier layer 10, or covers, corresponding to the first region 101 and the second region 102, all outer surfaces of the carrier layer 10. In specific implementation, the heat insulating layer 40 may use at least one heat insulating material with a porosity greater than 65%, such as aerogel, polysaccharide gel, diatomaceous earth, or a molecular sieve. A thickness of the heat insulating layer 40 may be controlled to range from 10 µm to 25 µm.

[0104] Through the heat insulating layer 40, in one aspect, heat generated by the induction unit 21 may be limited to tube space of the wrapping paper, to sufficiently heat the aerosol-generating substrate 200; and in another aspect, heat loss caused by heat transfer to the outside of the heat-not-burn article can be reduced, to improve heat utilization; and heat can be prevented from being transferred to an aerosol-generating apparatus, to affect user experience due to an excessively high temperature of the apparatus.

[0105] It should be noted that, in FIG. 11 and FIG. 12, the induction unit 21 and the encapsulation layer 30 are shown in a manner of protruding from a surface of the carrier layer 10. This is merely used to show an example of a rough arrangement relationship between related material layers in the wrapping paper or cigarette paper, and does not represent specific structure forms and specific sizes of the related material layers.

[0106] An embodiment of this application further provides a method for preparing a heating sheet, which is used to manufacture the electromagnetically induced self-heating heating sheet (that is, the wrapping paper) in the foregoing embodiment. Referring to FIG. 17, the preparation method includes step 1000 to step 4000.

[0107] Step 1000: Configure a coating slurry.

[0108] 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 particle may be in a strip-shaped fiber form); one or more materials of epoxy resin, chromium, silicone oil, ferrite, and the like are configured to form an encapsulation slurry; and aerogel, polysaccharide gel, diatomaceous earth, and a molecular sieve with a porosity greater than 65% are configured to form a heat insulating slurry.

[0109] Step 2000: Prepare the induction heating film 20 on the carrier layer 10.

[0110] For example, based on a contour shape of the induction heating film 20 and an arrangement manner of the induction heating film 20 on the carrier layer 10, a surface of aramid paper (or carbon nanotube paper, cellulose paper, or the like) with a grammage of 20 to 40 grams per square meter and a thickness of 10 to 80 microns is coated with the magnetic induction slurry by using a process such as film transfer, calendering, or printing, to form the induction heating film 20 on the first surface of the carrier layer 10. In specific implementation, a thickness of the magnetic induction slurry or the induction heating film 20 may be controlled to range from 5 microns to 50 microns.

[0111] Step 3000: Prepare the encapsulation layer 30 on the induction heating film 20.

[0112] For example, the induction heating film 20 is coated with the encapsulation slurry accumulatively by using a process such as film transfer, calendering, or printing, to form the encapsulation layer 30. In some embodiments, the induction heating films 20 may be coated with the encapsulation slurry one by one. The first surface of the carrier layer 30 may also be coated with the encapsulation slurry, so that the formed encapsulation layer 30 covers all the induction heating films 20.

[0113] Step 4000: Prepare the heat insulating layer 40 on the carrier layer 10.

[0114] For example, the second surface of the carrier layer 10 is coated with the heat insulating slurry by using a process such as film transfer, calendering, or printing, so that the heat insulating layer 40 covering the second surface of the carrier layer 10 is formed on the carrier layer 10. In some embodiments, a thickness of the heat insulating slurry or the heat insulating layer 40 may be controlled to range from 10 microns to 25 microns. In this way, a heating sheet with an electromagnetically induced self-heating function can be finally obtained.

Claims

1. An electromagnetically induced self-heating heating sheet, comprising a carrier layer and a plurality of induction heating films, wherein the induction heating film extends in a first direction of the carrier layer to be disposed on one surface of the carrier layer, the plurality of induction heating films are arranged side by side at intervals in a second direction of the carrier layer, and the induction heating film is capable of generating heat under action of an alternating magnetic field, and the first direction is perpendicular to the second direction; and the heating sheet is capable of being cut into at least one sheet unit with a preset shape, and the sheet unit is configured to wrap an aerosol-generating substrate, to be capable of heating the aerosol-generating substrate to generate aerosol.

2. The heating sheet according to claim 1, wherein the induction heating film is in a strip shape extending continuously in the first direction.

3. The heating sheet according to claim 2, wherein the sheet unit is capable of being wound into a tubular body in the first direction; and in the sheet unit, at least some of the induction heating films have different magnetic permeability, and / or at least some of the induction heating films have different widths and / or thicknesses.

4. The heating sheet according to claim 2, wherein the sheet unit is capable of being wound into a tubular body in the first direction or the second direction; and in the sheet unit, the induction heating films have a same length, width, and magnetic permeability.

5. The heating sheet according to claim 1, wherein the induction heating film has a plurality of induction units, and the plurality of induction units are arranged at intervals in the first direction, to form the intermittently extending induction heating film on the carrier layer.

6. The heating sheet according to claim 5, wherein a contour shape of the induction unit is an axisymmetric figure or a centrosymmetric figure.

7. The heating sheet according to claim 6, wherein the contour shape of the induction unit is one of a C-shape, an O-shape, an X-shape, and a polygon.

8. The heating sheet according to claim 5, wherein the plurality of induction units are distributed in a rectangular array on the carrier layer.

9. The heating sheet according to claim 5, wherein at least two rows of the induction units have different widths or thicknesses, and / or a spacing between at least two adjacent rows of the induction units is different from a spacing between another two adjacent rows of the magnetic induction units, and / or at least two rows of the induction units have different magnetic permeability.

10. The heating sheet according to claim 5, wherein sizes and magnetic permeability of the induction units are consistent.

11. The heating sheet according to claim 1, wherein a particle size of a particle of the induction heating film is 50 nm to 1 µm, and a thickness of the induction heating film is 5 µm to 50 µm; and / or the carrier layer is aramid paper, carbon nanotube paper, or cellulose paper having a thickness of 10 µm to 80 µm and a grammage of 20 to 40 grams per square meter.

12. The heating sheet according to claim 1, wherein the heating sheet further comprises an encapsulation layer, and the encapsulation layer covers the induction heating film.

13. The heating sheet according to claim 12, wherein the encapsulation layer has at least one material of epoxy resin, chromium, silicone oil, and ferrite.

14. The heating sheet according to claim 1, wherein the heating sheet further comprises a heat insulating layer, and the heat insulating layer covers a surface of the carrier layer away from the induction heating film.

15. The heating sheet according to claim 14, wherein the heat insulating layer has at least one material of aerogel, polysaccharide gel, diatomaceous earth, and a molecular sieve, a porosity of the heat insulating layer is greater than 65%, and a thickness of the heat insulating layer is 10 µm to 25 µm.

16. The heating sheet according to claim 1, wherein the sheet unit has a first region and a second region, and the induction heating film is located in the first region; and the sheet unit is capable of being wound into a tubular body, and the first region and the second region are arranged side by side in an axial direction of the tubular body.

17. The heating sheet according to any one of claims 1 to 16, wherein in the sheet unit, a quantity of the induction heating films is an odd number greater than or equal to 3.

18. A method for preparing an electromagnetically induced self-heating heating sheet, wherein the heating sheet comprises a carrier layer and a heat insulating layer, and the carrier layer has a first surface and a second surface that are opposite to each other; the heat insulating layer covers the second surface of the carrier layer; a plurality of induction heating films extending in a first direction of the carrier layer and an encapsulation layer covering the induction heating films are disposed on the first surface of the carrier layer, the plurality of induction heating films are arranged at intervals in a second direction of the carrier layer, and the induction heating film is capable of generating heat under action of an alternating magnetic field; and the first direction is perpendicular to the second direction, and the preparation method comprises the following steps: coating the first surface of the carrier layer with a magnetic induction slurry to form the induction heating film; coating a surface of the induction heating film with an encapsulation slurry to form the encapsulation layer; and coating the second surface of the carrier layer with a heat insulating slurry to form the heat insulating layer, to obtain the heating sheet.

19. A heat-not-burn article, comprising an aerosol-generating substrate and a wrapping material layer, wherein the wrapping material layer wraps an outer side of the aerosol-generating substrate, and the wrapping material layer uses the heating sheet according to any one of claims 1 to 17.

20. The heat-not-burn article according to claim 19, further comprising a mouthpiece, wherein the carrier layer extends to at least partially cover an outer peripheral surface of the mouthpiece.

21. A heat-not-burn system, comprising a heat-not-burn apparatus and the heat-not-burn article according to claim 19 or claim 20, wherein the heat-not-burn apparatus is configured to generate an alternating magnetic field, so that the induction heating film generates an eddy current to heat the aerosol-generating substrate.

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