Mesh heating element and preparation method thereof and ceramic atomizer

Abstract

The present invention provides a mesh heating element and a preparation method thereof, the preparation method comprising the following steps: providing a heating mesh, an electrode mesh and a substrate; wherein the mesh number of the electrode mesh is greater than the mesh number of the heating mesh; superimposing the electrode mesh, the heating mesh and the substrate together, the electrode mesh and the heating mesh are in contact and form a composite; printing a conductive paste on the composite with the substrate as a base; heating the substrate and the composite to pre-shape the conductive paste; separating the composite from the substrate, and then sintering the composite to obtain a mesh heating element; wherein the electrode mesh filled with the conductive paste serves as an electrode current collector of the mesh heating element. The preparation method can be used to prepare a mesh heating element with high resistance in the middle position and low resistance at the edge position, and the preparation method does not require welding, has a simple process, and is suitable for large-scale batch production. The present invention also provides a ceramic atomizer.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic cigarettes, and in particular to a mesh heating element, a preparation method thereof, and a ceramic atomizer. Background Art

[0002] Aerosol generating devices are also known as virtual cigarettes, electronic cigarettes, steam cigarettes, etc. They are mainly used to simulate the feeling of smoking without affecting health, so as to help people quit smoking or replace cigarettes.

[0003] The heating component is the core component of the aerosol generating device, in which the heating element in the heating component is the core component of the electrothermal conversion, and its main function is to heat the atomized liquid to produce smoke. At present, the commonly used heating elements on the market include spring wire, corrosion sheet mesh, thick film printed resistor, etc. In practical applications, it is necessary to connect the corresponding electrodes at both ends of the heating element. For example, the spring wire is connected to the metal wire by welding, and the corrosion sheet leaves two metal sheets as electrodes when etching. Thick film printing will also print the electrodes on the ceramic body and connect them with the point resistor. However, the electrodes of the mesh heating element woven by silk threads are difficult to prepare by traditional methods. The reasons include: 1. The traditional welding process is easy to be penetrated due to the ultra-thin thickness of the mesh heating element, thus losing the connection function; 2. The direct rolling of the metal film has poor adhesion, is easy to fall off, and is easy to cause poor contact, resulting in dry burning; 3. When using the screen printing process, because the mesh heating element has a porous structure, when the heating element is separated from the substrate or base, it is very easy to separate or pull off the electrode slurry, resulting in "missing welding" and "false welding".

[0004] In addition, the heating net itself needs to have a low mesh count, which is more likely to produce a high heating resistance, but the electrode current collector needs to have a high mesh count to reduce the resistance of the electrode current collector, improve its conductivity, and facilitate the electrical conduction between the electrode current collector and the power supply. Therefore, Philip Morris invented a heating net structure with a small number of meshes in the middle and a high number of meshes at the edge, but this structure is difficult to manufacture and has a very high cost. At the same time, although this structure can combine the heating net and the electrode by welding, there is a problem of difficulty in welding positioning, and the combination process is extremely difficult. Summary of the invention

[0005] The purpose of the present invention is to provide a mesh heating element and a preparation method thereof, which can be used to prepare a mesh heating element with high resistance in the middle position and low resistance in the edge position. Moreover, the preparation method does not require welding, has a simple process, and is suitable for large-scale batch production.

[0006] The present invention provides a method for preparing a mesh heating element, comprising the following steps:

[0007] A heating net, an electrode net and a substrate are provided; wherein the mesh number of the electrode net is greater than the mesh number of the heating net, and the size of the electrode net is smaller than the size of the heating net;

[0008] The electrode net, the heating net and the substrate are stacked together; wherein the electrode net and the heating net are in contact with each other and form a composite body, and the electrode net is located at the edge of the heating net;

[0009] Printing a conductive paste on the composite body with the substrate as the base, the printing position of the conductive paste corresponds to the position of the electrode mesh, the conductive paste is filled in the pores of the electrode mesh and the heating mesh at the same time, and the conductive paste contacts the surface of the substrate after penetrating the composite body;

[0010] The substrate and the composite are heated to pre-shape the conductive paste, the electrode mesh and the heating mesh are combined together by the pre-shaped conductive paste, and the substrate and the composite are also adhered together by the pre-shaped conductive paste;

[0011] The composite is separated from the substrate, and then the composite is sintered to solidify the conductive paste on the composite, thereby obtaining a mesh heating element; wherein the electrode mesh filled with the conductive paste serves as an electrode current collector of the mesh heating element.

[0012] In one achievable manner, the substrate is one of a weakly polar film, a non-polar film that has been subjected to corona treatment, a water-soluble film, or a pyrolytic film, so as to facilitate separation of the composite from the substrate.

[0013] In one achievable manner, the substrate is a weakly polar film; when separating the composite from the substrate, the substrate is directly peeled off from the composite.

[0014] In one feasible manner, the substrate is a non-polar film that has been corona treated; before the electrode mesh, the heating mesh and the substrate are stacked together, the substrate is first corona treated to increase the polarity of the substrate surface; when separating the composite from the substrate, the composite with the substrate adhered is first allowed to stand for a period of time, and after the polarity of the substrate surface is reduced to a certain value, the substrate is peeled off from the composite.

[0015] In one achievable manner, the substrate is a water-soluble film; when separating the composite from the substrate, the composite with the substrate adhered thereto is immersed in an aqueous solution, and the composite can be separated from the substrate after the substrate is dissolved.

[0016] In one achievable manner, the substrate is a pyrolysis film; when separating the composite body from the substrate, the composite body adhered with the substrate is first heated to make the substrate lose its adhesive force, and then the substrate is peeled off from the composite body.

[0017] In one achievable manner, the mesh size of the heating net is 60-300 meshes, and the mesh size of the electrode net is 500-800 meshes.

[0018] In a feasible manner, the thickness of the heating mesh is 10-30 microns, and the thickness of the electrode mesh is 10-20 microns.

[0019] In one feasible manner, the material of the heating mesh is at least one of stainless steel, nickel, titanium, iron-chromium-aluminum and carbon fiber, the material of the electrode mesh is at least one of stainless steel, silver, copper, platinum and gold, and the conductive paste is at least one of silver paste, platinum paste and gold paste.

[0020] In one achievable manner, the electrode mesh includes a first electrode mesh and a second electrode mesh, the first electrode mesh and the second electrode mesh are respectively located at edge positions on two opposite sides of the heating mesh, and the first electrode mesh and the second electrode mesh are spaced apart from each other.

[0021] The present invention also provides a mesh heating element, which is made by the preparation method of the mesh heating element as described above; the mesh heating element includes a heating mesh and an electrode mesh, the mesh number of the electrode mesh is greater than the mesh number of the heating mesh, the heating mesh and the electrode mesh are stacked up and down, and the electrode mesh is located at the edge of the heating mesh, the heating mesh and the electrode mesh are combined together by conductive paste, and the electrode mesh filled with the conductive paste serves as the electrode current collector of the mesh heating element.

[0022] In one feasible manner, the electrode mesh includes a first electrode mesh and a second electrode mesh, the first electrode mesh and the second electrode mesh are respectively located at the edge positions on opposite sides of the heating mesh, and the first electrode mesh and the second electrode mesh are spaced apart from each other, and the first electrode mesh and the second electrode mesh respectively serve as the positive electrode collector and the negative electrode collector of the mesh heating element.

[0023] The present invention also provides a ceramic atomizer, comprising the above-mentioned mesh heating element; the ceramic atomizer also comprises a porous ceramic body, and the heating net is in thermal contact with the porous ceramic body.

[0024] The mesh heating element and preparation method thereof provided by the present invention combine the heating mesh and the electrode mesh together through a conductive paste, the electrode mesh is located at the edge of the heating mesh, and the mesh number of the electrode mesh is greater than the mesh number of the heating mesh, so that a mesh heating element with high resistance in the middle position and low resistance at the edge position can be prepared, which can not only meet the high resistance heating demand of the mesh heating element, but also the high mesh number electrode mesh filled with conductive paste as the electrode current collector of the mesh heating element can improve the conductive function of the mesh heating element and facilitate the connection of the mesh heating element with an external circuit. At the same time, when printing the conductive paste, a substrate is used as a base. Due to the obstruction of the substrate, the conductive paste will not penetrate the composite and detach from the composite, ensuring that the conductive paste fills the pores of the composite, thereby ensuring good electrical connection and mechanical connection between the electrode mesh and the heating mesh. The preparation method does not require welding, has a simple process, low production cost, stable structure, and is suitable for large-scale batch production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of the ceramic atomizer in an embodiment of the present invention.

[0026] Figure 2 for Figure 1 Schematic diagram of the explosion structure.

[0027] Figures 3a to 3e Schematic diagram of the manufacturing process of the mesh heating element in an embodiment of the present invention.

[0028] Figure 4 Flow chart of the method for preparing a mesh heating element in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a particular sequence or order.

[0031] The directional words such as up, down, left, right, front, back, top, bottom, etc. (if any) involved in the specification and claims of the present invention are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional words should not limit the scope of protection claimed in the present invention.

[0032] Figures 3a to 3e This is a schematic diagram of the manufacturing process of the mesh heating element in the embodiment of the present invention. Figure 4FIG. 1 is a flow chart of a method for preparing a mesh heating element according to an embodiment of the present invention. Figures 3a to 3e and Figure 4 As shown, the method for preparing a mesh heating element provided by an embodiment of the present invention comprises the following steps:

[0033] like Figure 3a As shown, a heating net 11, an electrode net 12 and a substrate 3 are provided; wherein the mesh number of the electrode net 12 is greater than the mesh number of the heating net 11, and the size of the electrode net 12 is smaller than the size of the heating net 11 (specifically, in this embodiment, the heating net 11 and the electrode net 12 are both rectangular structures, the width of the electrode net 12 is the same as the width of the heating net 11, and the length of the electrode net 12 is smaller than the length of the heating net 11);

[0034] like Figure 3b As shown, the electrode mesh 12, the heating mesh 11 and the substrate 3 are stacked up and down; wherein the electrode mesh 12 and the heating mesh 11 are in contact and form a composite body, and the electrode mesh 12 is located at the edge of the heating mesh 11 (specifically, the electrode mesh 12, the heating mesh 11 and the substrate 3 can be stacked in the order of electrode mesh 12-heating mesh 11-substrate 3, or in the order of heating mesh 11-electrode mesh 12-substrate 3. In this embodiment, the three are stacked from top to bottom in the order of heating mesh 11-electrode mesh 12-substrate 3); after stacking, the three are rolled flat by a handheld roller;

[0035] like Figure 3c As shown, the conductive paste is printed on the composite body with the substrate 3 as the base, the printing position of the conductive paste corresponds to the position of the electrode mesh 12 (the conductive paste is not printed in the middle position of the heating mesh 11), the conductive paste is filled in the pores of the electrode mesh 12 and the heating mesh 11 at the same time, and the conductive paste contacts the surface of the substrate 3 after passing through the composite body (that is, the conductive paste contacts the surface of the substrate 3 after passing through the pores on the composite body); specifically, the composite body can be put into a screen printer, and the conductive paste can be printed on the composite body according to the pattern by using the screen printer;

[0036] The substrate 3 and the composite are heated to pre-shape the conductive paste to reduce the fluidity of the conductive paste so that the conductive paste has a certain solidification ability (in this step, the composite needs to be heated and pre-shaped together with the substrate 3, and the composite cannot be separated from the substrate 3 first, otherwise the conductive paste will flow out of the composite); the electrode mesh 12 and the heating mesh 11 are combined together by the pre-shaped conductive paste (the electrode mesh 12 and the heating mesh 11 are electrically and mechanically connected by the conductive paste, so there is no need for welding), and the substrate 3 and the composite are also adhered to each other by the pre-shaped conductive paste The composite body 12, the heating network 11 and the substrate 3 are adhered together by the conductive paste; since most of the conductive paste is filled in the pores of the electrode network 12 and the heating network 11, the electrode network 12 and the heating network 11 are tightly combined and difficult to separate; and only a small part of the conductive paste is adhered between the composite body and the surface of the substrate 3, so the adhesion between the composite body and the substrate 3 is relatively weak, which is convenient for the subsequent separation of the two); specifically, the composite body adhered with the substrate 3 can be placed in an oven, heated to 100-150° C., and left for 30 minutes to 120 minutes to pre-shape the conductive paste;

[0037] like Figure 3d As shown, the composite is separated from the substrate 3;

[0038] like Figure 3e As shown, after the composite is separated from the substrate 3, the composite is sintered to solidify the conductive paste on the composite, and the solidified conductive paste fills the pores of the composite to obtain a mesh heating element 1; wherein the electrode mesh 12 filled with the conductive paste serves as the electrode current collector of the mesh heating element 1.

[0039] It should be noted that this embodiment Figures 3a to 3e Only the production process of a single mesh heating element 1 is illustrated. In actual production applications, the sizes of the electrode mesh 12, the heating mesh 11 and the substrate 3 can be increased as needed to prepare a large-sized mesh heating element 1, and then the large-sized mesh heating element 1 can be cut to obtain multiple small-sized mesh heating elements 1, which are suitable for large-scale production.

[0040] Specifically, the preparation method of the mesh heating element provided in this embodiment combines the heating mesh 11 and the electrode mesh 12 together through a conductive paste, the electrode mesh 12 is located at the edge of the heating mesh 11, and the mesh number of the electrode mesh 12 is greater than the mesh number of the heating mesh 11, so that a mesh heating element 1 with high resistance in the middle position and low resistance at the edge position can be prepared (because the mesh number of the heating mesh 11 is low and the conductive paste is not printed in the middle position of the heating mesh 11, the resistance of the mesh heating element 1 in the middle position is high; and the mesh number of the electrode mesh 12 located at the edge position is high and is printed with conductive paste, so the resistance of the mesh heating element 1 at the edge position is low), which can not only meet the high resistance heating demand of the mesh heating element 1, but also the high mesh number electrode mesh 12 filled with conductive paste serves as the electrode collector of the mesh heating element 1, which can improve the conductive function of the mesh heating element 1 and facilitate the connection of the mesh heating element 1 with an external circuit. At the same time, when printing the conductive paste, the substrate 3 is used as the base. Due to the obstruction of the substrate 3, the conductive paste will not penetrate the composite and separate from the composite, ensuring that the conductive paste fills the pores of the composite, thereby ensuring good electrical and mechanical connection between the electrode mesh 12 and the heating network 11. Moreover, the conductive paste can be covered with a high-mesh electrode mesh 12, which not only allows the conductive paste to be filled evenly and flatly, but also prevents the conductive paste from falling off easily. The preparation method does not require welding, has a simple process, low production cost, stable structure, and is suitable for large-scale batch production.

[0041] As an embodiment, the substrate 3 is one of a weak polar film, a non-polar film treated with corona, a water-soluble film or a pyrolytic film, so as to facilitate the separation of the composite and the substrate 3, thereby avoiding the detachment or tearing of the conductive paste when the composite and the substrate 3 are separated, so as to ensure the integrity of the electrode collector and avoid the occurrence of "missing welds" or "cold welds" when the electrode collector is welded to the external electrode.

[0042] As an implementation mode, the substrate 3 is a weak polar film. In this embodiment, the dielectric loss of the weak polar film is defined as being greater than or equal to 10 -4 and less than or equal to 10 -3 (The polarity of the film can be judged by the dielectric loss value), and the weak polar film can be specifically made of PP, PE, silicone, etc. When the substrate 3 is a weak polar film, due to the weak polarity of the substrate 3, that is, the substrate 3 has a certain adhesiveness, the composite body can be adhered to the substrate 3 through the conductive paste; and because the adhesiveness of the substrate 3 is not strong, when separating the composite body from the substrate 3, the substrate 3 can be directly peeled off from the composite body, and the conductive paste on the composite body will not be torn off.

[0043] As another embodiment, the substrate 3 is a non-polar film that has been corona treated. In this embodiment, the dielectric loss of the non-polar film is defined as less than 10 -4(i.e., the non-polar film has basically no polarity), and the non-polar film can specifically be a fluorine material (e.g., polytetrafluoroethylene, fluororubber, etc.). When the substrate 3 is made of a non-polar film, before the electrode mesh 12, the heating mesh 11 and the substrate 3 are superimposed together, the substrate 3 is first subjected to a corona treatment to increase the polarity of the surface of the substrate 3 (i.e., to increase the adhesion of the surface of the substrate 3, so that the composite can be adhered to the substrate 3 through the conductive paste); when separating the composite from the substrate 3, the composite adhered with the substrate 3 is first allowed to stand for a period of time, and after the polarity of the surface of the substrate 3 is reduced to a certain value (i.e., to reduce the adhesion of the surface of the substrate 3, for example, to reduce the dielectric loss of the substrate 3 to less than 10 -3 ), and then peeling the substrate 3 from the composite.

[0044] Specifically, since the non-polar film has almost no adhesiveness, it is necessary to perform corona treatment on the non-polar film to improve the adhesiveness of its surface so that it can adhere to the conductive paste. When the substrate 3 is subjected to corona treatment, the cross-linked structure on the surface of the substrate 3 is reduced compared to the cross-linked structure inside it, so the functional groups on the surface of the substrate 3 have a higher polarity, making it easy to combine with the solvent in the conductive paste; after the conductive paste is printed and left to stand for a period of time (for example, one day), the solvent in the conductive paste evaporates, and the corona fails, and the substrate 3 slowly becomes a weakly polar film, thereby facilitating the separation of the substrate 3 from the composite.

[0045] As another embodiment, the substrate 3 is a water-soluble film, which can be a polyethylene glycol film, a starch-based film, etc. When the substrate 3 is a water-soluble film, when separating the composite from the substrate 3, the composite adhered with the substrate 3 is immersed in an aqueous solution, and the composite can be separated from the substrate 3 after the substrate 3 is dissolved. At the same time, after the substrate 3 is dissolved, the composite needs to be taken out of the aqueous solution and dried.

[0046] As another embodiment, the substrate 3 is a pyrolysis film; when separating the composite body from the substrate 3, the composite body adhered with the substrate 3 is first heated to make the substrate 3 lose its adhesive force, and then the substrate 3 is peeled off from the composite body.

[0047] Specifically, the pyrolytic film is a unique film that has adhesive force at room temperature, but its adhesive force disappears when the pyrolytic film is heated, so that it can be easily peeled off.

[0048] As an implementation mode, the mesh size of the heating net 11 is 60-300 meshes, and the mesh size of the electrode net 12 is 500-800 meshes.

[0049] As an implementation manner, the thickness of the heating mesh 11 is 10-30 microns, and the thickness of the electrode mesh 12 is 10-20 microns.

[0050] As an embodiment, the material of the heating mesh 11 is at least one of stainless steel, nickel, titanium, iron-chromium-aluminum and carbon fiber, the material of the electrode mesh 12 is at least one of stainless steel, silver, copper, platinum and gold, and the conductive paste is at least one of silver paste, platinum paste and gold paste. Preferably, the conductive paste is a silver paste with a silver powder content of more than 70%.

[0051] As an embodiment, the number of electrode nets 12 is two, and the electrode nets 12 include a first electrode net 121 and a second electrode net 122. The first electrode net 121 and the second electrode net 122 are respectively located at the edge positions on the opposite sides of the heating net 11, and the first electrode net 121 and the second electrode net 122 are spaced apart from each other, so that the mesh heating element 1 forms a structure with high resistance in the middle position and low resistance at the edges on both sides.

[0052] like Figure 1 and Figure 2 As shown, the embodiment of the present invention also provides a mesh heating element 1, which is made by the above-mentioned preparation method of the mesh heating element. The mesh heating element 1 includes a heating mesh 11 and an electrode mesh 12, the mesh number of the electrode mesh 12 is greater than the mesh number of the heating mesh 11, the heating mesh 11 and the electrode mesh 12 are stacked up and down, and the electrode mesh 12 is located at the edge of the heating mesh 11, the heating mesh 11 and the electrode mesh 12 are combined together by conductive slurry, and the electrode mesh 12 filled with conductive slurry serves as the electrode current collector of the mesh heating element 1.

[0053] like Figure 1 and Figure 2 As shown, as an embodiment, the electrode mesh 12 includes a first electrode mesh 121 and a second electrode mesh 122, and the first electrode mesh 121 and the second electrode mesh 122 are respectively located at the edge positions on the opposite sides of the heating mesh 11, and the first electrode mesh 121 and the second electrode mesh 122 are spaced apart from each other, and the first electrode mesh 121 and the second electrode mesh 122 respectively serve as the positive electrode collector and the negative electrode collector of the mesh heating element 1, and the positive electrode collector and the negative electrode collector are respectively used to connect to the positive and negative electrodes of a power source (not shown).

[0054] like Figure 1 and Figure 2 As shown, an embodiment of the present invention also provides a ceramic atomizer, including the above-mentioned mesh heating element 1. The ceramic atomizer also includes a porous ceramic body 2, the mesh heating element 1 is located below the porous ceramic body 2, and the heating net 11 is in thermal contact with the porous ceramic body 2, and the mesh heating element 1 can be combined with the porous ceramic body 2 by sintering. When in use, the mesh heating element 1 generates heat after being powered on, and the heat generated by the mesh heating element 1 is conducted to the porous ceramic body 2, and the porous ceramic body 2 heats and atomizes the smoke oil (smoke paste) to generate smoke for the user to inhale.

[0055] The mesh heating element 1 and the preparation method thereof provided in the embodiment of the present invention have the following advantages:

[0056] 1. The heating net 11 and the electrode net 12 are combined together through the conductive paste, the electrode net 12 is located at the edge of the heating net 11, and the mesh number of the electrode net 12 is greater than the mesh number of the heating net 11, so that a mesh heating element 1 with high resistance in the middle and low resistance at the edge can be prepared, which can not only meet the high resistance heating demand of the mesh heating element 1, but also the high mesh number electrode net 12 filled with the conductive paste as the electrode current collector of the mesh heating element 1 can improve the conductive function of the mesh heating element 1, and facilitate the connection (welding) of the mesh heating element 1 with the external circuit;

[0057] 2. When printing the conductive paste, the substrate 3 is used as the base. Due to the barrier of the substrate 3, the conductive paste will not penetrate the composite and separate from the composite, ensuring that the conductive paste fills the pores of the composite, thereby ensuring good electrical and mechanical connection between the electrode mesh 12 and the heating mesh 11. Moreover, the conductive paste can be covered by the high-mesh electrode mesh 12, which not only allows the conductive paste to be evenly filled, but also prevents the conductive paste from falling off easily;

[0058] 3. The substrate 3 is made of a weak polar film, a non-polar film treated with corona, a water-soluble film or a pyrolytic film, so as to facilitate the separation of the composite and the substrate 3, thereby preventing the conductive paste from being separated or pulled away when the composite and the substrate 3 are separated, so as to ensure the integrity of the electrode collector and avoid the phenomenon of "missing welding" or "false welding" when the electrode collector is welded to the external electrode;

[0059] 4. This preparation method does not require welding, has a simple process, low production cost, stable structure, and is suitable for large-scale batch production.

[0060] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for preparing a mesh heating element, characterized in that: The following steps are involved: Providing a heating net, an electrode net and a substrate, wherein the mesh number of the electrode net is greater than the mesh number of the heating net; The electrode net, the heating net and the substrate are stacked together; wherein the electrode net and the heating net are in contact with each other and form a composite body, and the electrode net is located at the edge of the heating net; Printing a conductive paste on the composite body with the substrate as the base, wherein the printing position of the conductive paste corresponds to the position of the electrode mesh, and heating the substrate and the composite body to pre-shape the conductive paste; The composite is separated from the substrate, and then the composite is sintered to solidify the conductive paste on the composite, thereby obtaining a mesh heating element; wherein the electrode mesh filled with the conductive paste serves as an electrode current collector of the mesh heating element.

2. The method for preparing a mesh heating element according to claim 1, characterized in that: The substrate is one of a weak polar film, a non-polar film treated with corona, a water-soluble film or a pyrolysis film, so as to facilitate the separation of the composite from the substrate.

3. The method for preparing a mesh heating element according to claim 2, characterized in that: The substrate is a weakly polar film; when separating the composite from the substrate, the substrate is directly peeled off from the composite.

4. The method for preparing a mesh heating element according to claim 2, characterized in that: The substrate is a non-polar film that has been corona treated. Before the electrode network, the heating network and the substrate are stacked together, the substrate is first corona treated to increase the polarity of the substrate surface. When separating the composite from the substrate, the composite with the substrate adhered is first allowed to stand for a period of time, and after the polarity of the substrate surface is reduced to a certain value, the substrate is peeled off from the composite.

5. The method for preparing a mesh heating element according to claim 2, characterized in that: The substrate is a water-soluble film; when separating the composite from the substrate, the composite with the substrate adhered thereto is immersed in an aqueous solution, and the composite can be separated from the substrate after the substrate is dissolved.

6. The method for preparing a mesh heating element according to claim 2, characterized in that: The substrate is a pyrolysis film; when separating the composite body from the substrate, the composite body adhered with the substrate is first heated to make the substrate lose its adhesive force, and then the substrate is peeled off from the composite body.

7. The method for preparing a mesh heating element according to claim 1, characterized in that: The size of the electrode mesh is smaller than that of the heating mesh.

8. The method for preparing a mesh heating element according to claim 7, characterized in that: The mesh size of the heating net is 60-300 meshes, and the mesh size of the electrode net is 500-800 meshes.

9. The method for preparing a mesh heating element according to claim 1, characterized in that: The thickness of the heating net is 10-30 microns, and the thickness of the electrode net is 10-20 microns.

10. A mesh heating element, characterized in that: The mesh heating element is manufactured by the preparation method of any one of claims 1 to 9; the mesh heating element comprises a heating mesh and an electrode mesh, the mesh number of the electrode mesh is greater than the mesh number of the heating mesh, the heating mesh and the electrode mesh are stacked up and down, and the electrode mesh is located at the edge of the heating mesh, the heating mesh and the electrode mesh are combined together by conductive paste, and the electrode mesh filled with the conductive paste serves as the electrode current collector of the mesh heating element.

11. A ceramic atomizer, characterized in that: It comprises the mesh heating element as described in claim 10; the ceramic atomizer also comprises a porous ceramic body, and the heating mesh is in thermal contact with the porous ceramic body.

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