Electromagnetic induction self-heating cigarette paper and aerosol generating product

Abstract

An electromagnetic induction self-heating cigarette paper and an aerosol generating product. The electromagnetic induction self-heating cigarette paper comprises a base body layer, an induction heating layer, an encapsulation layer, and a heat insulation layer; the front face of the base body layer is used to face an aerosol substrate, and the back face of the base body layer is used to face away from the aerosol generating substrate; the induction heating layer is stacked on the front face of the base body layer and is used for heating the aerosol substrate; the encapsulation layer is attached to the side of the induction heating layer facing away from the base body layer, so as to prevent the induction heating layer from falling off of the base body layer; and the heat insulation layer is attached to the back face of the base body layer and is used for isolating heat of the induction heating layer to within a packaging structure enclosingly formed by the electromagnetic induction self-heating cigarette paper.

Description

Electromagnetic induction self-heating cigarette paper and aerosol generating products

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to a Chinese utility model patent application filed on November 21, 2023, with application number 2023231444361, entitled "An electromagnetic induction self-heating cigarette paper and aerosol generating product," the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of heat-not-burn technology, and in particular to an electromagnetic induction self-heating cigarette paper and an aerosol-generating product. Background Art

[0004] Induction heating refers to the process in which the alternating current generated by a power supply passes through a coil to generate an alternating magnetic field. A magnetic object placed in the alternating magnetic field cuts the alternating magnetic lines of force, thereby generating alternating currents, namely eddy currents, in the magnetic object. The eddy currents cause the atoms inside the magnetic object to move at high speed and irregularly. The atoms collide and rub against each other, generating heat energy, thereby achieving a heating effect.

[0005] In a related art heat-not-burn device utilizing induction heating, a heating coil is disposed within the smoking device, surrounding a chamber containing the aerosol-generating article. A central heating element, made of a magnetically conductive material, is disposed within the chamber. The central heating element is designed to penetrate the center of the aerosol-generating article to heat the article via induction heating. Because the central heating element is disposed at the center of the aerosol-generating substrate, the heating surface in contact with the substrate is relatively small. Consequently, heat transfer from the center of the aerosol-generating substrate to the outside may result in insufficient heating of the substrate's periphery and excessive heating of the center, leading to uneven heating of the substrate. Summary of the Invention

[0006] The present application mainly provides an electromagnetic induction self-heating cigarette paper and an aerosol generating product to solve the technical problem of uneven heating of an aerosol generating matrix.

[0007] According to the first aspect, an embodiment provides an electromagnetic induction self-heating cigarette paper, comprising:

[0008] a base layer having a front side facing toward the aerosol-generating substrate and a back side facing away from the aerosol-generating substrate when in use;

[0009] an induction heating layer, stacked on the front surface of the base layer, wherein the induction heating layer is configured to generate heat in an alternating magnetic field environment;

[0010] an encapsulation layer attached to a side of the induction heating layer facing away from the base layer to prevent the induction heating layer from falling off the base layer;

[0011] The heat insulating layer is attached to the back surface of the base layer and is used to isolate the heat of the induction heating layer.

[0012] In an optional embodiment, the electromagnetic induction self-heating cigarette paper has an induction heating area and a non-induction heating area, the induction heating layer is located in the induction heating area, and at least part of the non-induction heating area is used to wrap at least part of the outer circumference of the mouthpiece.

[0013] In an optional embodiment, the induction heating layer includes a plurality of strip-shaped induction heating bodies, each of which is attached to the front surface of the base layer, and two adjacent induction heating bodies are arranged at intervals.

[0014] In an optional embodiment, the thickness of the induction heating layer is 5-50 μm, the induction heating layer comprises induction heating particles, the induction heating particles are made of magnetic conductive material, and have a particle size of 0.05-1 μm.

[0015] In an optional embodiment, the base layer includes at least one of aramid paper, carbon nanotube paper and cellulose paper, and has a tensile strength of not less than 1.5 KN / m.

[0016] In an optional embodiment, the encapsulation layer includes at least one of epoxy resin, chromium, silicone oil and ferrite.

[0017] In an optional embodiment, the thermal insulation layer is a porous structure.

[0018] In an optional embodiment, the porosity of the thermal insulation layer is greater than 65%.

[0019] In an optional embodiment, the thermal insulation layer includes at least one of aerogel, polysaccharide gel, diatomaceous earth and molecular sieve, and has a thermal conductivity lower than 0.06 W / (m·K).

[0020] According to a second aspect, an embodiment provides an aerosol-generating product comprising a mouthpiece, an aerosol-generating substrate, and a packaging structure made of any of the above-described electromagnetic induction self-heating cigarette papers, wherein the aerosol-generating substrate is located within the packaging structure.

[0021] According to the electromagnetic induction self-heating cigarette paper and aerosol generating product of the above embodiment, the electromagnetic induction self-heating cigarette paper includes a base layer, an induction heating layer, a packaging layer and a heat insulation layer. The front side of the base layer is used to face the aerosol matrix. The induction heating layer is stacked on the front side of the base layer and is used to heat the aerosol matrix. The packaging layer is attached to the side of the induction heating layer facing away from the base layer to prevent the induction heating layer from falling off from the base layer. After the electromagnetic induction self-heating cigarette paper is rolled into a packaging structure, the induction heating layer can transfer heat to the outer peripheral surface of the aerosol generating matrix through the packaging layer to increase the aerosol generating matrix. The heat area is reduced, and the heat is transferred radially from the outside to the inside, which can effectively improve the heating rate of the aerosol generating matrix, reduce the temperature difference between the center and the periphery of the aerosol generating matrix, and help to improve the heating uniformity of the aerosol generating matrix; and the heat insulation layer is arranged on the side of the base layer facing away from the aerosol generating matrix, so that the heat can be isolated from the packaging structure surrounded by the electromagnetic induction self-heating cigarette paper through the heat insulation effect of the heat insulation layer, which helps to avoid heat diffusion and affecting the normal operation of the smoking device, and also helps to reduce heat loss and improve the heating uniformity of the aerosol generating matrix. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic diagram of the multi-layer structure of electromagnetic induction self-heating cigarette paper and the positional relationship of each layer in one embodiment;

[0023] FIG2 is a schematic structural diagram of a coating device for an induction heating layer in electromagnetic induction self-heating cigarette paper according to an embodiment;

[0024] FIG3 is a schematic axial cross-sectional view of the structure of the electromagnetic induction self-heating cigarette paper and the aerosol-generating matrix used in an aerosol-generating product according to an embodiment;

[0025] FIG4 is a schematic radial cross-sectional view of a structure of an electromagnetic induction self-heating cigarette paper and an aerosol-generating matrix used in an aerosol-generating product according to an embodiment;

[0026] FIG5 is a schematic radial cross-sectional view of a structure of an electromagnetic induction self-heating cigarette paper and an aerosol-generating matrix used in an aerosol-generating product according to an embodiment;

[0027] FIG. 6 is a schematic diagram of the structure of an aerosol-generating article according to an embodiment.

[0028] In the figure: 101, induction heating zone; 102, non-induction heating zone; 1, substrate layer; 2, induction heating layer; 21, induction heating body; 3, packaging layer; 4, thermal insulation layer; 5, aerosol generating matrix; 61, first roller; 62, second roller; 7, tipping paper; 8, filtration section; 9, cooling section. DETAILED DESCRIPTION

[0029] The present application is further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail. They can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0030] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0031] Component numbers used herein, such as "first" and "second," are used solely to distinguish the components being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0032] The embodiment of the present application discloses an electromagnetic induction self-heating cigarette paper. Please refer to Figures 3 and 4. The electromagnetic induction self-heating cigarette paper can be rolled into a cylindrical packaging structure. The packaging structure can be used in aerosol-generating products to wrap the aerosol-generating matrix 5 and heat the aerosol-generating matrix 5 by electromagnetic induction heating, thereby increasing the heating surface of the aerosol-generating matrix 5 and reducing the temperature difference between the periphery and the center of the aerosol-generating matrix 5, which helps to improve the heating efficiency of the aerosol-generating matrix 5 and the heating uniformity of the aerosol-generating matrix 5.

[0033] Specifically, referring to Figures 1, 3, 4, and 5, the electromagnetic induction self-heating cigarette paper is a multi-layer composite structure, comprising a base layer 1, an induction heating layer 2, an encapsulation layer 3, and a thermal insulation layer 4. The base layer 1 serves as the carrier layer for the entire electromagnetic induction self-heating cigarette paper, and the induction heating layer 2, thermal insulation layer 4, and encapsulation layer 3 can be composited or laminated and fixed to the base layer 1.

[0034] The base layer 1 can be made of a material that is resistant to high temperatures, has good porosity, a stretching rate ≥ 0.8KN / m, and a tensile strength of not less than 1.5KN / m. The base layer 1 has good porosity to facilitate combination with the particles of the aerosol generating matrix 5, and the base layer 1 has good tensile strength to facilitate the rolling and forming of the base layer 1. According to the above-mentioned performance requirements for the base layer 1, in some embodiments, the base layer 1 may include at least one of aramid paper, carbon nanotube paper, and cellulose paper, that is, one of aramid paper, carbon nanotube paper, and cellulose paper can be used as the base layer 1. For example, in one embodiment, cellulose paper can be selected as the base layer 1; of course, in other embodiments, multiple different types of paper can also be bonded and fixed into one layer as the base layer 1. The thickness of the base layer 1 is 10-80μm, and the gram weight is 20-40g / m 2 The base layer 1 has a front side and a back side. After the electromagnetic induction self-heating cigarette paper roll is made into a packaging structure and applied to an aerosol-generating product, the front side of the base layer 1 is the side facing the aerosol-generating matrix 5 inside the packaging structure, and the back side of the base layer 1 is the side facing outside the packaging structure and away from the aerosol-generating matrix 5.

[0035] The induction heating layer 2 is stacked or fixed on the front side of the base layer 1. The induction heating layer 2 can generate eddy currents in an alternating magnetic field to generate heat. The induction heating layer 2 can be used as a heat source to heat the aerosol generating matrix 5. In some embodiments, a plurality of magnetic conductive materials can be mixed with an adhesive to form a coating slurry, and the coating slurry is compounded in layers on the front side of the base layer 1 through processes such as mold transfer, calendering or printing to form the induction heating layer 2. Figure 2 shows the structure of a coating device for the induction heating layer 2 in one embodiment. The coating device for the induction heating layer 2 includes a first roller 61 and a second roller 62. The two rollers are arranged in parallel. The base material layer passes between the two rollers. The coating slurry is coated on the outer peripheral surface of the first roller 61. The two rollers roll out materials in opposite directions. In this way, the coating slurry is transferred and fixed on the base layer 1 to form the induction heating layer 2.

[0036] Specifically, in some embodiments, the induction heating layer 2 has induction heating particles, which are made of magnetic conductive material. The elements in the induction heating particles include at least one of carbon, iron, nickel, copper and germanium. For example, the induction heating particles may include copper particles, iron particles, nickel particles, or may be mixed particles including multiple elements of the above-mentioned carbon, iron, nickel, copper and germanium, such as carbon steel and ferrite. The particle size of the induction heating particles is 0.05-1 μm, which can meet the thickness of the induction heating layer 2 within the range of 5-50 μm, helping to reduce the overall thickness of the entire electromagnetic induction self-heating cigarette paper. In other embodiments, the induction heating layer 2 can also be formed into a thin film structure with a thickness of 5-50 μm by stamping a magnetic conductive material with good ductility. The induction heating layer 2 can be fixed to the base layer 1 by gluing.

[0037] Furthermore, in one embodiment, the induction heating layer 2 may include a plurality of strip-shaped induction heating bodies 21, each of which is connected to the base layer 1, and two adjacent induction heating bodies 21 are spaced apart. Such a structure of the induction heating layer 2 with the induction heating bodies 21 spaced apart can enable the induction heating layer 2 to heat the aerosol-generating substrate 5 more evenly. In one embodiment, the induction heating bodies 21 may be linear, elongated structures, and the width of the elongated induction heating bodies 21 may be 1-10 mm. The induction heating bodies 21 may extend in the width direction of the electromagnetic induction self-heating cigarette paper, and two adjacent induction heating bodies 21 may be spaced apart in the length direction of the electromagnetic induction self-heating cigarette paper, so that the induction heating layer forms a zebra strip structure.

[0038] In some other embodiments, the shape of the induction heating body 21 may not be restricted. For example, the induction heating body 21 may be configured to be wavy, irregularly folded, or other irregularly shaped long strip structures. The induction heating bodies 21 may also be arranged at intervals in their extension direction, or the extension direction of the induction heating body 21 may not be restricted. The induction heating body 21 may be arranged perpendicular to the length direction of the electromagnetic induction self-heating cigarette paper or at an acute angle to the width direction of the electromagnetic induction self-heating cigarette paper. As long as two adjacent induction heating bodies 21 do not contact each other, the induction heating layer 2 may be prevented from forming an electromagnetic shielding structure as a whole, which helps to ensure the uniformity of heating of the aerosol generating matrix 5 by the induction heating layer 2.

[0039] In some other embodiments, the induction heating layer 2 can also be formed by a layered structure, and through holes or gaps can be provided on the induction heating layer 2 to avoid the front surface of the base layer 1 being entirely coated with the induction heating layer 2, which causes heat to be concentrated locally in the aerosol generating matrix 5 and burn, thereby helping to improve the uniformity of heating of the aerosol generating matrix 5 by the induction heating layer 2.

[0040] The encapsulation layer 3 is located on the side of the induction heating layer 2 facing away from the base layer 1. The encapsulation layer 3 is attached to the induction heating layer 2 to prevent the induction heating layer 2 from falling off the base layer 1. The encapsulation layer 3 is made of a material that is resistant to high temperatures, has good adhesion, and does not produce harmful substances when heated to 500°C. According to the above-mentioned performance requirements for the encapsulation layer 3, in some embodiments, the encapsulation layer 3 may include at least one of epoxy resin, chromium, silicone oil and ferrite; for example, in one embodiment, the encapsulation layer 3 is epoxy resin, and the epoxy resin can be coated on the induction heating layer 2 to achieve the encapsulation effect. The encapsulation layer 3 can be attached to the position of the induction heating layer 2 by the above-mentioned mold transfer, calendering or printing processes of the induction heating layer 2, and it is only necessary to set the encapsulation layer 3 on the induction heating body 21 or on the induction heating layer 2. The encapsulation layer 3 is not set in the gap between two adjacent induction heating bodies 21 or in the through holes or gaps on the induction heating layer 2; of course, in some other embodiments, in order to facilitate coating, the encapsulation layer 3 can also be set in the gap between two adjacent induction heating bodies 21 or in the through holes or gaps on the induction heating body 21.

[0041] In some other embodiments, in order to ensure the encapsulation effect, the encapsulation layer 3 may also include epoxy resin and silicone oil, which can be understood as coating epoxy resin and silicone oil in sequence on the induction heating body 21 to form the encapsulation layer 3; of course, in some other embodiments, the encapsulation layer 3 may also be formed by mixing at least two materials of epoxy resin, chromium, silicone oil and ferrite, and then coating the mixture on the induction heating body 21.

[0042] The thermal insulation layer 4 is located on the back side of the base layer 1 and is bonded to the back side of the base layer 1 to isolate the heat from the induction heating layer 2. Specifically, in some embodiments, the thermal insulation layer 4 has a porous structure to provide better thermal insulation. In some embodiments, the porosity of the thermal insulation layer 4 is greater than 65% to further improve its thermal insulation performance.

[0043] Furthermore, the thermal conductivity of the thermal insulation layer 4 is relatively low, and the thermal conductivity of the thermal insulation layer 4 can be set to be lower than 0.06W / (m•K) to ensure that the thermal insulation layer 4 has a good thermal insulation effect. Specifically, in some embodiments, the thermal insulation layer 4 may include an aerogel layer, a polysaccharide gel layer, a diatomaceous earth layer or a molecular sieve layer, or a composite layer formed by at least two of aerogel, polysaccharide gel, diatomaceous earth and molecular sieve; for example, in one embodiment, the thermal insulation layer 4 may be an aerosol, and the thermal insulation layer 4 may also be fixed to the back of the base layer 1 by processes such as mold transfer, calendering or printing, so that the thermal insulation layer 4 is fixedly connected to the base layer 1. The thickness of the thermal insulation layer 4 is 10-25μm, which helps to reduce the thickness of the entire electromagnetic induction self-heating cigarette paper and facilitates the electromagnetic induction self-heating cigarette paper to be wound into a cylindrical packaging structure.

[0044] In some other embodiments, in order to ensure the thermal insulation effect, the thermal insulation layer 4 can also be formed by aerogel and polysaccharide gel, which can be understood as coating aerogel and polysaccharide gel in sequence on the base layer 1 to form the thermal insulation layer 4; of course, in some other embodiments, the thermal insulation layer 4 can also be formed by mixing at least two materials among aerogel, polysaccharide gel, diatomaceous earth and molecular sieve, and coating them on the base layer 1.

[0045] Please refer to Figures 3 and 4. In this application, the electromagnetic induction self-heating cigarette paper can be rolled into a packaging structure. The two ends of the electromagnetic induction self-heating cigarette paper can be bonded by an adhesive. The packaging structure is composed of an encapsulation layer 3, an induction heating layer 2, a base layer 1 and an insulation layer 4 from the inside to the outside in its radial direction. The induction heating layer 2 is arranged on the radial inner side of the base layer 1 so that the induction heating layer 2 is closer to the aerosol generating matrix 5, and the encapsulation layer 3 is arranged on the side of the induction heating layer 2 facing away from the base layer 1. This can effectively prevent the induction heating layer 2 from falling off the encapsulation layer 3, and the encapsulation layer 3 has good thermal conductivity and can effectively transfer the heat of the induction heating layer 2 to the aerosol generating matrix 5 located in the packaging structure; in this way, the outer peripheral surface of the aerosol generating matrix 5 forms a heating surface, which helps to increase the heating area of ​​the entire aerosol generating matrix 5. The use of a heating method from the outside to the inside in the radial direction can effectively increase the heating rate of the aerosol generating matrix 5, reduce the temperature difference between the center and the periphery of the aerosol generating matrix 5, and thereby improve the heating uniformity of the aerosol generating matrix 5.

[0046] The heat-insulating layer 4 is arranged on the radially outer side of the base layer 1, so that the heat-insulating layer 4 can block the heat within the packaging structure, so that the electromagnetic induction self-heating cigarette paper has a better heat-insulating effect, which helps to prevent the heat of the induction heating layer 2 from diffusing radially outward and affecting the normal operation of the smoking device, helps to reduce heat loss, and also helps to improve the heating uniformity of the aerosol generating matrix 5.

[0047] In some embodiments, the electromagnetic induction self-heating cigarette paper has an induction heating area 101 and a non-induction heating area 102, the induction heating layer 2 is located in the induction heating area 101, and at least a portion of the non-induction heating area 102 is used to wrap at least a portion of the outer circumference of the mouthpiece in the aerosol generating article.

[0048] Specifically, referring to Figures 5 and 6, an induction heating zone 101 and a non-induction heating zone 102 can be arranged in sequence on the winding axis of the electromagnetic induction self-heating cigarette paper, and only the induction heating zone 101 is used to wrap the aerosol generating matrix 5; the base layer 1 covers the induction heating zone 101 and the non-induction heating zone 102, while the induction heating layer 2, the packaging layer 3 and the thermal insulation layer 4 are only provided in the induction heating zone 101. During the production process of the electromagnetic induction self-heating cigarette paper, the induction heating layer 2, the packaging layer 3 and the thermal insulation layer 4 can be coated only on one end of the base layer 1 in the first direction, leaving the base layer 1 exposed at the other end in the first direction. The first direction is the electromagnetic induction self-heating cigarette. The winding axis direction of the paper; of course, in some other embodiments, it is only necessary to ensure that the induction heating layer 2 is located in the induction heating area 101, and the packaging layer 3 and / or the heat insulation layer 4 can also cover at least part of the non-induction heating area 102; the non-induction heating area 102 on the electromagnetic induction self-heating cigarette paper can be used to wrap around the outer peripheral surface of the mouthpiece when assembling the aerosol generating product. It can wrap the entire outer peripheral surface of the mouthpiece, such as including the cooling section 9 and the filtering section 8 of the mouthpiece, or it can wrap at least part of the outer peripheral surface of the mouthpiece, such as only wrapping the cooling section 9 of the mouthpiece, so as to realize the connection between the aerosol generating matrix 5 in the aerosol generating product and the mouthpiece in the axial direction of the aerosol generating product.

[0049] The embodiments of the present application also disclose an aerosol generating product, please refer to Figure 6, which includes a mouthpiece, an aerosol generating matrix 5 and a packaging structure made of the electromagnetic induction self-heating cigarette paper of any of the above embodiments, and the aerosol generating matrix 5 is located in the packaging structure.

[0050] Specifically, the aerosol generating matrix 5 may include a tobacco product. In one embodiment, the aerosol generating matrix 5 may be a granular or sheet structure made of tobacco material. By placing the aerosol generating matrix 5 in the packaging structure, both ends of the packaging structure can be sealed by a sheet structure made of the same material as the base layer 1 to prevent the aerosol generating matrix 5 from diffusing.

[0051] In an embodiment in which the electromagnetic induction self-heating cigarette paper used to make the packaging structure has a non-induction heating zone 102, the aerosol generating matrix 5 is a cylindrical structure. In one embodiment, the aerosol generating matrix 5 may also include outer wrapping paper, and at least one tobacco product selected from granular, flaky and random filamentous forms is located inside the outer wrapping paper to form a cylindrical structure. After the electromagnetic induction self-heating cigarette paper is rolled into the packaging structure, the aerosol generating matrix 5 with a cylindrical structure may be loaded into the packaging structure, and the aerosol generating matrix 5 may correspond to the induction heating zone 101 in the axial direction of the packaging structure.

[0052] The non-induction heating zone 102 can be used to wrap around at least a portion of the outer circumference of the mouthpiece in the aerosol-generating article. Specifically, the aerosol-generating article is a cylindrical structure, the aerosol-generating substrate 5 is located at one axial end of the aerosol-generating article, and the mouthpiece of the aerosol-generating article includes a cooling section 9 and a filter section 8. The filter section 8 is located at the other axial end of the aerosol-generating article, and the cooling section 9 is located between the filter section 8 and the aerosol-generating substrate 5. The non-induction heating zone 102 of the packaging structure formed by the electromagnetic induction self-heating cigarette paper can be wrapped only around the outer circumference of the cooling section 9. Of course, in some other embodiments, it can also be wrapped around the outer circumferences of the cooling section 9 and the filter section 8, so that the axial dimensions of the packaging structure surrounded by the electromagnetic induction self-heating cigarette paper are the same as the axial dimensions of the aerosol-generating article.

[0053] The outer circumferential surface of the packaging structure formed by winding the electromagnetic induction self-heating cigarette paper having the non-induction heating zone 102 is uneven, wherein the outer diameter of the non-induction heating zone 102 is smaller than the outer diameter of the induction heating zone 101. Therefore, in order to facilitate the use of the aerosol generating product, in some embodiments, please refer to Figure 6, the aerosol generating product is provided to further include an outer cylinder formed by winding the tipping paper 7, and the outer cylinder is wrapped on the outer circumferential surface of the packaging structure formed by winding the electromagnetic induction self-heating cigarette paper to avoid stratification of the outer circumferential surface of the aerosol generating product and facilitate the use of the aerosol generating product.

[0054] Of course, in the embodiment where the non-induction heating area 102 covers the entire outer circumference of the mouthpiece, the aerosol generating product may not be provided with the outer cylinder formed by winding the tipping paper 7.

[0055] In the process of winding the electromagnetic induction self-heating cigarette paper into a packaging structure, the packaging layer 3 on the electromagnetic induction self-heating cigarette paper is located on the radial inner side of the base layer 1, and the thermal insulation layer 4 is arranged on the radial outer side of the base layer 1, so that the heat is concentrated and isolated in the packaging structure through the thermal insulation layer 4, which helps to reduce heat loss, reduce the temperature product between the center and the periphery of the aerosol matrix, and help to improve the heating uniformity of the aerosol generating matrix 5; and the entire induction heating layer 2 is located on the radial outer side of the aerosol matrix, and the outer peripheral surface of the aerosol matrix is ​​the heating surface, which helps to increase the heating surface of the entire aerosol matrix, and the heat is transferred from the radial outer side to the inner side, which helps to increase the heating rate of the aerosol matrix and further improve the heating uniformity of the aerosol generating matrix 5.

Claims

1. An electromagnetic induction self-heating cigarette paper, characterized in that: include: a base layer having a front side facing the aerosol-generating substrate and a back side facing away from the aerosol-generating substrate when in use; an induction heating layer, stacked on the front surface of the base layer, wherein the induction heating layer is configured to generate heat in an alternating magnetic field environment; An encapsulation layer, attached to a side of the induction heating layer facing away from the substrate layer, to prevent the induction heating layer from falling off the substrate layer; The heat insulating layer is attached to the back side of the base layer and is used to isolate the heat of the induction heating layer.

2. The electromagnetic induction self-heating cigarette paper according to claim 1, characterized in that: The electromagnetic induction self-heating cigarette paper has an induction heating area and a non-induction heating area, the induction heating layer is located in the induction heating area, and at least part of the non-induction heating area is used to wrap at least part of the outer peripheral surface of the mouthpiece.

3. The electromagnetic induction self-heating cigarette paper according to claim 1, characterized in that: The induction heating layer comprises a plurality of strip-shaped induction heating bodies, each of which is attached to the front side of the base layer, and two adjacent induction heating bodies are arranged at intervals.

4. The electromagnetic induction self-heating cigarette paper according to claim 1, characterized in that: The thickness of the induction heating layer is 5-50 μm, and the induction heating layer comprises induction heating particles, which are made of magnetic conductive material and have a particle size of 0.05-1 μm.

5. The electromagnetic induction self-heating cigarette paper according to any one of claims 1 to 4, characterized in that: The base layer includes at least one of aramid paper, carbon nanotube paper and cellulose paper, and has a tensile strength of not less than 1.5 KN / m.

6. The electromagnetic induction self-heating cigarette paper according to any one of claims 1 to 4, characterized in that: The encapsulation layer includes at least one of epoxy resin, chromium, silicone oil and ferrite.

7. The electromagnetic induction self-heating cigarette paper according to any one of claims 1 to 4, characterized in that: The heat insulation layer is a porous structure.

8. The electromagnetic induction self-heating cigarette paper according to claim 7, characterized in that: The porosity of the thermal insulation layer is greater than 65%.

9. The electromagnetic induction self-heating cigarette paper according to claim 7, characterized in that: The heat-insulating layer comprises at least one of aerogel, polysaccharide gel, diatomaceous earth and molecular sieve, and has a thermal conductivity lower than 0.06 W / (m•K).

10. An aerosol generating product, characterized in that It comprises a mouthpiece, an aerosol generating substrate and a packaging structure rolled from the electromagnetic induction self-heating cigarette paper according to any one of claims 1 to 9, wherein the aerosol generating substrate is located in the packaging structure.

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