Sensing metal wire, preparation method and smoke cartridge

Abstract

The invention discloses a sensing metal wire, a preparation method and a smoke cartridge, the preparation method comprises the steps that surface treatment is conducted on a first magnetic metal material and a second magnetic metal material, and the surface treatment comprises the steps of polishing, acid pickling and oil stain removing; according to a preset composite forming mode, the first magnetic metal material and the second magnetic metal material which are subjected to surface treatment are composited into a composite wire blank; and drawing the composite wire blank by using a wire drawing die to prepare the sensing metal wire. Through the application, the problems that in the prior art, a metal sheet is adopted for center heating, the heating body configuration is too concentrated to collect heat, the contact area is limited, and a metal pipe is adopted for circumferential heating, the heat conduction speed is low, and the temperature control is inaccurate are solved; the beneficial effects that the transverse cutting force is reduced, the difficulty in the cutting process of the small sections of the fuming body is reduced, the abrasion of the cutter is reduced, and the production efficiency of the heat-not-burn product is improved are achieved.

Description

Technical Field

[0001] This invention relates to the field of heated non-combustible (HNB) aerosol generation technology, and particularly to sensing metal wires, preparation methods, and cartridges. Background Technology

[0002] In heated tobacco product (HNB) technologies, electromagnetic heating commonly employs two modes. The first is central heating from within the cartridge, where the magnetic heating element is a metal sheet embedded in the axial region of the aerosol matrix section within the cartridge. This method suffers from drawbacks such as complex embedding processes, difficult cutting, overly concentrated heating element configuration, and limited thermal contact area. The second is circumferential heating from the outside of the cartridge, where the magnetic heating element is a metal tube integrated into the inner wall of the cartridge compartment. This method suffers from defects such as slow heat conduction, inaccurate temperature measurement and control, a tendency to produce a pasty taste, and a blackening of the cartridge's appearance after use.

[0003] In related technologies, using metal sheets for central heating has the problems of overly concentrated heating element configuration and limited heat collection contact area, as well as slow heat conduction and inaccurate temperature control when using metal tubes for circumferential heating. No effective solutions have yet been proposed. Summary of the Invention

[0004] In view of this, it is necessary to provide a sensing wire, a preparation method, and a cartridge to at least solve the problems in the related technology.

[0005] In a first aspect, the present invention provides a technical solution as follows: a method for preparing a sensing metal wire, comprising surface treatment of a first magnetic metal material and a second magnetic metal material, wherein the surface treatment includes polishing, pickling, and degreasing; combining the surface-treated first magnetic metal material and the second magnetic metal material into a composite wire blank according to a preset composite molding method; and drawing the composite wire blank using a wire drawing die to prepare a sensing metal wire.

[0006] In some embodiments, the first magnetic metal material and the second magnetic metal material are composited into a composite wire blank according to a preset composite molding method, including: At least one strip of the first magnetic metal material and the second magnetic metal material, which have undergone surface treatment, are combined into a first composite strip of a target thickness according to a preset composite process, wherein the composite process includes one or more of the following: lamination, spraying, cladding, welding, electroplating, chemical plating, and coating. The first composite strip is slit and cut into first blanks of a preset size, and the first blanks are trimmed and chamfered using a preset tool to generate the corresponding composite blanks.

[0007] Composite strips laminated to the target thickness using a pre-defined composite process include: By using a lamination process, a first thin strip corresponding to the first magnetic metal material and a first thick strip corresponding to the second magnetic metal material are combined to generate a first composite strip. The first composite strip is annealed in an annealing furnace to generate the composite strip. The temperature inside the annealing furnace during annealing is 650-950°C, and the annealing furnace is set to a vacuum state or injected with protective gas.

[0008] In some embodiments, the first magnetic metal material and the second magnetic metal material are composited into a composite wire blank according to a preset composite molding method, including: After placing the first magnetic metal material in the shape of a thick, round rod into a preset drawing die, the first magnetic metal material in the shape of a thick, round rod is drawn out from the die hole of the drawing die by a preset clamp, and after multiple drawing operations, a first thin metal rod is obtained, wherein the cross-sectional diameter of the first thin metal rod is 0.3 mm to 5 mm; After rolling, rotating, and curling operations are performed on the strip-shaped second magnetic metal material, the curled semi-circular tube is welded into a round tube, and the round tube is drawn multiple times to obtain a hollow tube, wherein the inner diameter of the hollow hole of the hollow tube is larger than the cross-sectional diameter of the first metal rod. After the first metal rod is nested in the hollow tube, the resulting metal blank is subjected to multiple drawing and annealing operations. After the first metal rod and the hollow tube are tightly bonded together, the bonded metal blank is extruded and drawn to obtain the composite wire blank.

[0009] In some embodiments, the first magnetic metal material and the second magnetic metal material are composited into a composite wire blank according to a preset composite molding method, including: At least one strip-shaped first magnetic metal material and second magnetic metal material that have undergone surface treatment are laminated together to form a second composite strip of the target thickness; The composite tube is formed after the second composite strip is subjected to rolling, rotary pressing and coiling operations.

[0010] In some embodiments, the first magnetic metal material comprises an iron-nickel-based alloy, wherein the weight percentage of nickel is 35-88 wt% and the weight percentage of iron is 12-65 wt%.

[0011] In some embodiments, the second magnetic metal material comprises a neodymium-iron-boron-based alloy, wherein the weight percentage of neodymium is 15-28 wt%, the weight percentage of iron is 70-80 wt%, and the weight percentage of boron is 1-8 wt%.

[0012] Secondly, the present invention also provides a technical solution as follows: a sensing metal wire, prepared using the preparation method described in the first aspect, comprising a first magnetic metal material and a second magnetic metal material, wherein the first magnetic metal material and the second magnetic metal material are pressed together to form a solid wire, wherein the metal material corresponding to the first magnetic metal material includes one of the following: elemental nickel, iron-nickel based alloy, neodymium iron boron based alloy, Invar alloy, Kovar alloy, and / or the metal material corresponding to the second magnetic metal material includes one of the following: elemental iron, elemental cobalt, neodymium iron boron based alloy, iron-chromium-cobalt based alloy, iron-chromium-aluminum based alloy, magnetic stainless steel, samarium-cobalt based alloy, aluminum-nickel-cobalt based alloy, iron-chromium-cobalt based alloy.

[0013] Thirdly, the present invention also provides a technical solution as follows: a sensing metal wire, prepared using the preparation method described in the first aspect, comprising an inner metal material and an outer metal material, wherein the inner metal material is embedded within the outer metal material, wherein the inner metal material and the outer metal material are compositely formed into a solid wire stacked from the inside to the outside in the radial direction, wherein the material corresponding to the inner metal material includes one of the following: nickel elemental metal, iron-nickel based alloy, neodymium iron boron based alloy, Invar alloy, Kovar alloy, and / or the metal corresponding to the outer metal material includes one of the following: iron elemental metal, cobalt elemental metal, neodymium iron boron based alloy, iron-chromium-cobalt based alloy, iron-chromium-aluminum based alloy, magnetic stainless steel, samarium-cobalt based alloy, aluminum-nickel-cobalt based alloy, iron-chromium-cobalt based alloy.

[0014] Fourthly, the present invention also provides a technical solution as follows: a sensing metal wire, prepared using the preparation method described in the first aspect, comprising an inner magnetic metal material and an outer magnetic metal material arranged sequentially along the radial outer periphery, wherein the inner magnetic metal material and the outer magnetic metal material are compositely stacked to form a solid wire or a hollow wire, wherein the material corresponding to the inner magnetic metal material includes one of the following: elemental iron, elemental cobalt, neodymium iron boron based alloy, iron-chromium-cobalt based alloy, iron-chromium-aluminum based alloy, magnetic stainless steel, samarium-cobalt based alloy, aluminum-nickel-cobalt based alloy, iron-chromium-cobalt based alloy, and / or the material corresponding to the outer magnetic metal material includes one of the following: elemental nickel, iron-nickel based alloy, neodymium iron boron based alloy, Invar alloy, Kovar alloy.

[0015] In some embodiments, the hollow wire has a circular or C-shaped cross-section.

[0016] Fifthly, the present invention also provides a technical solution as follows: a cigarette cartridge, comprising cigarette paper, a filter section, a cooling section, and a matrix section, wherein the filter section, the cooling section, and the matrix section are arranged sequentially along the axial direction and wrapped within the cigarette paper, wherein the matrix section comprises sensing metal wires, an aerosol matrix, and a shaping paper, wherein multiple sensing metal wires are embedded in the aerosol matrix, and the shaping paper is wrapped around the outer surface of the aerosol matrix.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: On the one hand, the sensing metal wire of this application can serve as a novel supplement to the common electromagnetic heating non-combustible method; on the other hand, since the metal wire has the advantages of being easy to cut during processing and uniform heating and carbonization during operation, it can make the aerosol matrix heat up more evenly, produce smoke faster, produce more abundant smoke, and achieve more uniform carbonization to improve the utilization rate of effective components, while reducing the phenomenon of excessive carbonization caused by local overheating, which can lead to charring or even the release of harmful substances; furthermore, the sensing metal wire can be twisted with the tobacco matrix carrier strands in various combinations, making it easy to manufacture into various forms suitable for different needs and scenarios. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the fabrication process of the sensing metal wire according to Embodiment 1 of this application; Figure 2 This is a schematic flowchart of the preparation method of the sensing metal wire in Embodiment 1 of this application; Figure 3 yes Figure 1 A magnified schematic diagram of the structure of the sensing wire at point A; Figure 4 This is a schematic diagram of the preparation process of the sensing metal wire according to Embodiment 2 of this application; Figure 5 This is a schematic flowchart of the preparation method of the sensing metal wire in Embodiment 2 of this application; Figure 6 yes Figure 4 A magnified schematic diagram of the structure of the sensing wire at point B; Figure 7 This is a schematic diagram of the fabrication process of the sensing metal wire in Embodiment 3 of this application; Figure 8 yes Figure 7 A magnified schematic diagram of the structure of the sensing wire at point C; Figure 9 This is a schematic diagram of the cross-section of the C-shaped metal wire in Example 4; Figure 10 This is an electron microscope image of the cross-section of the C-shaped metal wire in Example 4; Figure 11 A schematic diagram of the cross-section of the elliptical metal wire in Example 5; Figure 12 This is a schematic diagram of the composition of a cigarette cartridge containing metal wires. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that when a component is said to be "mounted on" another component, it can be directly mounted on the other component or may be interspersed with a component. When a component is said to be "set on" another component, it can be directly set on the other component or may be interspersed with a component. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or may be interspersed with a component.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Please see Figures 1 to 12 The sensing metal wire in this application embodiment is a single physical unit, and its material composition includes one or more of the following: elemental metal, single alloy, and composite metal. Examples of elemental metals include iron (Fe), nickel (Ni), and cobalt (Co); examples of single alloys include various magnetic stainless steels (such as ferritic stainless steel, martensitic stainless steel, and certain cold-worked austenitic stainless steel), various soft magnetic alloys (such as permalloy, iron-based amorphous alloy, cobalt-based amorphous alloy, iron-based nanocrystalline alloy, and iron-silicon-aluminum alloy), various hard magnetic alloys (such as neodymium-iron-boron-based alloy, samarium-cobalt-based alloy, aluminum-nickel-cobalt-based alloy, and iron-chromium-cobalt-based alloy), and various expansion alloys (such as Invar alloy and Kovar alloy); composite metals contain two or more metallic materials, including at least one magnetic material, and composite refers to being combined together by means of rolling, electroplating, electroless plating, sputtering, welding, cladding, and coating.

[0023] To address the aforementioned technical problems, this embodiment proposes a method for preparing a sensing metal wire, the sensing metal wire itself, and a cartridge containing the sensing metal wire.

[0024] It should be noted that this embodiment only schematically shows metal wires composed of two or three metal materials. In some other embodiments, multiple metal materials can be used, such as 2 to 6 metal materials, to form a multi-layer composite structure. The detailed features of this part are within the understanding of those skilled in the art, and will not be listed and described in detail here.

[0025] The sensing wire of this application significantly improves processability and production efficiency while reducing manufacturing costs. The outer diameter of the wire is controlled within a fine millimeter range. Compared to the wider metal strips or sheets in existing technologies, this fine filament structure concentrates stress during the cartridge slitting process, resulting in minimal cutting resistance. This effectively solves the problems of difficult cutting of wide metal strips and rapid tool wear, improving production efficiency and yield. The use of composite materials with good ductility allows for the fabrication of fine filaments through conventional drawing processes, overcoming the bottleneck of traditional high-performance permanent magnet materials such as neodymium iron boron being unable to be processed into filaments. This provides a diverse and feasible material basis for the manufacture of heating elements.

[0026] The sensing wires used in this application enable uniform and efficient planar heating, significantly improving the user experience. Multiple ultra-fine wires can be controllably and evenly distributed across the entire cross-section of the aerosol matrix, forming a "planar heating" network. This completely eliminates the problems of large temperature gradients and uneven carbonization caused by traditional "point heating" with a central metal sheet or "shell heating" with an external metal tube. This ensures maximum heating area and a consistent temperature field in the aerosol matrix, resulting in more stable aerosol release, fuller vapor production, and a consistent inhalation experience. Furthermore, the wires themselves have an extremely high surface-to-volume ratio, enabling rapid eddy current generation and heating in an alternating magnetic field. Their low thermal inertia allows for rapid activation and instant response of the e-cigarette cartridge.

[0027] The sensing wires used in this application enhance structural stability and reliability. The uniformly distributed wire network forms a stable three-dimensional support framework within the aerosol matrix, helping to maintain the structural integrity of the smoke generator during processing, transportation, and use, preventing collapse, thereby maintaining stable airflow channels and ensuring consistent suction resistance.

[0028] The sensing wire used in this application offers a high degree of design flexibility and compatibility. The wire configuration can be well integrated into existing e-cigarette cartridge manufacturing processes such as spinning, weaving, and splicing, without requiring disruptive modifications to the production line. The technology transfer path is clear, the industrialization threshold is low, and it provides a modular and customizable material solution for product development, facilitating optimized design for different performance and cost targets. Example 1

[0029] Please refer to the following: Figure 1 and Figure 2 , Figure 1This is a schematic diagram of a fabrication process for the sensing metal wire described in this application. Figure 2 This is a schematic flowchart of an embodiment of the preparation method of the sensing metal wire of this application, wherein the preparation method includes, but is not limited to, the following steps.

[0030] Step S31, Surface treatment: Select the first magnetic metal material 1, iron-nickel based glass sealing alloy 4J42 thin strip (0.6mm thick as an example), and the second magnetic metal material 2, stainless steel 410 thick strip (1.8mm thick as an example). Anneal the two strips in a continuous atmosphere annealing furnace at 930℃. Then, grind their surfaces, pickle them to remove oil and foreign matter, and make their surfaces smooth and flat. Finally, dry and rewind them.

[0031] Optionally, in the iron-nickel based alloy of the first magnetic metal material 1 in this embodiment, the weight percentage of nickel is between 35-88 wt%, and the weight percentage of iron is between 12-65 wt%.

[0032] In some other embodiments, the Curie temperature of the first magnetic metal material 1 is between 300-550°C, and the Curie temperature of the second magnetic metal material is between 650-1200°C. The first magnetic metal material is one of elemental nickel, iron-nickel based alloy, neodymium-iron-boron based alloy, Invar alloy, and Kovar alloy. The second magnetic metal material is one of elemental iron, elemental cobalt, iron-chromium-cobalt based alloy, iron-chromium-aluminum based alloy, magnetic stainless steel, samarium-cobalt based alloy, aluminum-nickel-cobalt based alloy, and iron-chromium-cobalt based alloy. In the neodymium-iron-boron based alloy, the weight percentage of neodymium is 15-28 wt%, the percentage of iron is 70-80 wt%, and the percentage of boron is 1-8 wt%.

[0033] Step S32, Composite: The thin strip is laminated using a lamination process to form a composite strip with a final thickness of approximately 1.2 mm. The two materials achieve physical contact, meaning deformation and cracking occur at the contact surfaces, resulting in mechanical interlocking. Annealing is then performed (specifically, diffusion annealing at 650-950℃ in a protective atmosphere or vacuum environment) to promote interdiffusion between iron, nickel, cobalt, chromium, and silicon atoms, further enhancing the bonding strength. Alternatively, in some other embodiments, one or more processes such as rolling, spraying, cladding, welding, electroplating, electroless plating, or coating can be used to composite 2-6 metal materials together to form a composite strip.

[0034] Step S33, Slitting: Cut the above composite strip into composite wire blanks with a width of 1.5mm, i.e., a cross-section of 1.5mm x 1.2mm. Generally, the length-to-width ratio is no greater than 3.

[0035] It should be noted that the dimensional parameters in this embodiment are only an example. Those skilled in the art can set the dimensional parameters according to their needs, and no specific limitations are made here.

[0036] Step S34, chamfering: Use a cutting tool to trim the composite wire blank to form rounded corners, in order to reduce the risk of breakage during subsequent processing.

[0037] In this embodiment, through steps 32 to 34, by performing compounding, slitting and chamfering, a preset composite molding method is achieved to combine the first magnetic metal material 1 and the second magnetic metal material 2 into a composite wire blank.

[0038] Step S35, wire drawing: With the assistance of the mold, the composite wire blank is drawn multiple times by mechanical force to prepare the sensing metal wire. Its cross-section is roughly circular with an equivalent diameter of 0.3 mm. The final product is annealed for 2 hours under vacuum at 800℃ (the temperature range can be 600-900℃) to make it soft, which is convenient for subsequent winding and cutting.

[0039] Please see Figure 3 , Figure 3 yes Figure 1 The diagram shows an enlarged view of the sensing wire at point A. In this embodiment, the binary sensing wire is a solid wire with a roughly circular cross-section and a diameter of approximately 0.3 mm. In some embodiments, it may be a composite material made of a first magnetic metal material 1, an iron-nickel-based glass-sealed alloy 4J42 (Curie temperature approximately 360°C), and a second magnetic metal material 2, stainless steel 410 (Curie temperature approximately 700°C). This embodiment only uses these two materials as examples. In other embodiments, other magnetic materials may be used. For example, the first magnetic metal material may be one or more of the following: nickel elemental metal, iron-nickel-based alloy, neodymium iron boron-based alloy, Invar alloy, or Kovar alloy; the second magnetic metal material may be one or more of the following: iron elemental metal, cobalt elemental metal, neodymium iron boron-based alloy, iron-chromium-cobalt-based alloy, iron-chromium-aluminum-based alloy, magnetic stainless steel, samarium-cobalt-based alloy, aluminum-nickel-cobalt-based alloy, or iron-chromium-cobalt-based alloy.

[0040] In this embodiment, the cross-sectional area ratio of the 4J42 portion to the 410 stainless steel portion of the sensing wire is approximately 1:3. At the interface between the two, there is a thin layer (not shown in the figure) formed by inter-atomic diffusion between metal atoms, with a thickness of less than 0.001 mm, which tightly binds the two together. The sensing wire is in an annealed soft state, making it easy to deform and cut. Example 2

[0041] Please refer to the following: Figure 4 and Figure 5 , Figure 4This is a schematic diagram of another fabrication process for the sensing metal wire in this application. Figure 5 This is a schematic flowchart of another embodiment of the preparation method of the sensing metal wire of this application, wherein the preparation method includes, but is not limited to, the following steps.

[0042] Step S41, Surface treatment: Mechanically grind and / or chemically treat the surface of the substrate to be laminated to remove oil and foreign matter, and make the surface clean, flat and smooth. In this embodiment, the first magnetic metal material 1 can be selected as nickel, and a thick round bar with a diameter of 10 mm can be used, or as follows: Figure 4 As shown, a plate with a certain thickness is selected, cut into rectangular strips, and then formed into a thin rod with a cross-sectional diameter of about 2mm through multiple wire drawing dies.

[0043] Optionally, the second magnetic metal material 2 can be electrical pure iron DT4. A thick strip with a thickness of 1.6mm is used. The surfaces of the two raw materials are polished, and then pickled to remove oil and foreign matter, making the surface smooth.

[0044] Step S42, rod making (taking the selection of a coarse rod as an example): the first magnetic metal material 1 nickel coarse round rod is pulled out of the die hole of the wire drawing die by the clamp under the action of the drawing force, and the process is repeated many times to produce a small cross-section metal rod. The cross-sectional diameter of the nickel rod is 2mm. Step S43, tube making: The second metal layer magnetic material 2 iron thick strip is rolled and joined by rolling mill rotation and pressing, then welded into a round tube, and then drawn into a hollow iron tube with an inner diameter slightly larger than 2mm. Step S44, Composite: The above-mentioned nickel rod and iron tube are nested together, then drawn, and then annealed to make the nickel rod and iron tube tightly bonded. Finally, repeated extrusion and drawing are performed to prepare a nickel-iron composite rod. In this embodiment, through steps 42 to 44, by performing rod making, tube making and compounding, the first magnetic metal material 1 and the second magnetic metal material 2 are compounded into a composite wire blank according to another preset composite molding method.

[0045] Step S45, drawing: With the assistance of the mold, the nickel-iron composite rod is drawn by mechanical force to prepare a sensing metal wire with a diameter of 0.4 mm and a roughly circular cross-section.

[0046] In this embodiment, only these two materials are used as examples. In some other embodiments, other magnetic materials may be used. For example, the first magnetic metal material may be one or more of the following: nickel elemental metal, iron-nickel based alloy, neodymium iron boron alloy; the second magnetic metal material may be one or more of the following: iron elemental metal, cobalt elemental metal, neodymium iron boron based alloy, iron-chromium-cobalt based alloy, iron-chromium-aluminum based alloy, magnetic stainless steel, samarium-cobalt based alloy, aluminum-nickel-cobalt based alloy, iron-chromium-cobalt based alloy.

[0047] Step S46, Electroplating: Finally, an electroplating process is used to deposit a chromium protective coating with a thickness of approximately 0.0015 mm on the surface of the sensing metal wire to prevent the iron from rusting.

[0048] Please see Figure 6 , Figure 6 yes Figure 4 The diagram shows an enlarged view of the sensing wire at point B. In this embodiment, the sensing wire is a ternary sensing wire configuration, a solid wire with a cross-section resembling tree rings, roughly circular in shape, and approximately 0.403 mm in diameter. It is made of a composite of a first magnetic metal material 1 (nickel N6, Curie temperature approximately 354°C) and a second magnetic metal material 2 (iron DT4, electrical pure iron, Curie temperature approximately 770°C), and is coated with a third metal material 3 (chromium plating). The first magnetic metal material 1 can be a magnetic material such as nickel, and is rod-shaped, serving as the metal core; the second magnetic metal material 2 can be a magnetic material such as iron, and is ring-shaped, serving as the metal sheath; the third metal material 3 can be a magnetic material such as chromium, and is ring-shaped, serving as the outer coating. Example 3

[0049] Please see Figure 7 , Figure 7 This is a schematic diagram of another fabrication process for the sensing metal wire of this application, wherein the fabrication method includes, but is not limited to, the following steps.

[0050] First, a composite strip is formed by laminating a first magnetic metal material 1, precision alloy 4J34 thin strip, with a second magnetic metal material 2, stainless steel 430 thin strip. Then, the composite strip is prepared into a composite tube with an inner diameter of about 0.4 mm. Finally, the composite tube is repeatedly drawn to prepare a capillary composite metal hollow wire with an outer diameter of 0.6 mm, a wall thickness of 0.1 mm, and an inner diameter of 0.4 mm.

[0051] Please see Figure 8 , Figure 8 yes Figure 7The enlarged schematic diagram of the sensing wire at point C shows that the wire in this embodiment is a binary sensing wire configuration, a hollow wire with a hollow cross-section, an approximately circular outer perimeter, a diameter of about 0.6 mm, and a central hole diameter of 0.4 mm. It is made of a composite and processed material consisting of a first magnetic metal material 1 (iron-nickel-cobalt alloy 4J34 precision alloy, Curie temperature approximately 470°C) and a second magnetic metal material 2 (stainless steel 430, Curie temperature approximately 700°C). The first magnetic metal material 1, in a ring structure, is located on the outer layer, and the second magnetic metal material 2, also in a ring structure, is located on the inner layer; the two are tightly connected. Example 4

[0052] The difference between this embodiment and Embodiment 3 is that the cross-section of the metal wire formed after multiple drawing of the composite tube is an unsealed C-shape. It can be understood that, referring to... Figure 7 In the wire drawing process, the C-shaped opening becomes smaller and smaller during repeated drawing. If the outer diameter needs to be around 1mm in some applications, drawing can be stopped to form a hollow C-shaped metal wire. (Refer to...) Figure 9 The diagram illustrates this; if the drawing process continues, a sealed circular metal wire similar to that in Example 3 will be formed.

[0053] Reference Figure 10 The diagram illustrates a cross-sectional electron microscope image of a state between a sealed opening and a C-shape. The joint is formed by multiple stretching processes to create a gap. It is understandable that if the drawing process continues, a hollow metal wire with virtually no gaps will be formed under the action of the wire drawing die. Example 5

[0054] The difference between this embodiment and embodiments three and four is that the composite tube is pulled multiple times until the hollow part disappears, thus forming a solid metal wire.

[0055] Reference Figure 11 The diagram illustrates the cross-section of a solid metal wire formed after multiple drawing operations of a composite tube. In one embodiment, it presents an elliptical shape. In other embodiments, it can present a trapezoidal, irregular, or other geometric shape, which can be determined by the drawing die. Example 6

[0056] This application also provides a cigarette cartridge containing the sensing metal wire described in the foregoing embodiments. Please refer to [link to relevant documentation]. Figure 12 This is a schematic diagram of a structure containing a sensing metal wire. It should be noted that the sensing metal wire in this embodiment can be used in an electromagnetic cartridge of any structure. This embodiment only uses one cartridge structure as an example for illustration.

[0057] In this embodiment, the cartridge is a slender cylinder with an outer diameter of approximately 7 mm and has a three-segment structure: the first segment is the matrix segment, approximately 16 mm long, containing 9 (or more, such as 3-100) composite metal wires from the aforementioned embodiment (using a sensing metal wire made of two materials (first magnetic metal material 1 and second magnetic metal material 2) as an example), a paste-like aerosol matrix 4, and a shaping layer 5 of aluminum foil wrapped around the outer surface; the second segment is the cooling segment 6, which can be 15 mm long and mainly composed of polylactic acid to form a loose and porous structure; the third segment is the filter segment 7, which can be 14 mm long and mainly composed of cellulose acetate. The three cylindrical segments are arranged coaxially in sequence and are wound and bonded in parallel by the outer cigarette paper 8 to form the finished cartridge. When the cartridge is used in an electromagnetic smoking device, the small segment of the sensing metal wire acts as a sensor, coupling with a high-frequency alternating electromagnetic field, generating eddy currents that heat and carbonize the adjacent aerosol matrix, releasing aerosol.

[0058] The sensing metal wire, its manufacturing method, and the tobacco cartridge containing it in this embodiment are suitable for applications in electromagnetic induction heating non-combustible tobacco products. The sensing metal wire has a circular or nearly circular cross-section and contains 2-6 types of metallic materials, of which at least 2 are magnetic materials. The manufacturing process of the sensing metal wire includes: surface treatment, lamination, slitting, chamfering, and drawing; or surface treatment, rod making, tube making, lamination, and drawing. The tobacco cartridge contains a filter tip, a cooling component, an aerosol matrix, and several short segments of the sensing metal wire, possessing the characteristic of electromagnetic eddy current heating. During the inhalation process of the tobacco cartridge, the sensing metal wire provides inductive heating and magnetic signal feedback, and can assist the smoking device in achieving anti-counterfeiting identification and temperature measurement of the tobacco cartridge.

[0059] To prevent excessive metal wires from being difficult to cut during sizing and from causing over-carbonization or even scorching during smoking, this invention defines the number of metal wires in the cartridge to be between 2 and 100, with the diameter of each wire set between 0.01 and 1 mm, while still achieving the necessary eddy current heating effect and considering economic cost and manufacturability.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any appropriate changes and variations made to the above embodiments within the essential spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for preparing a sensing metal wire, characterized in that, include: The first magnetic metal material and the second magnetic metal material are subjected to surface treatment, wherein the surface treatment includes polishing, pickling, and degreasing; According to the preset composite molding method, the first magnetic metal material and the second magnetic metal material, after surface treatment, are combined into a composite wire blank; Using a drawing die, the composite wire blank is drawn to prepare a sensing metal wire.

2. The preparation method according to claim 1, characterized in that, According to a preset composite molding method, the first magnetic metal material and the second magnetic metal material are composited into a composite wire blank, including: At least one strip of the first magnetic metal material and the second magnetic metal material, which have undergone surface treatment, are combined into a first composite strip of a target thickness according to a preset composite process, wherein the composite process includes one or more of the following: lamination, spraying, cladding, welding, electroplating, chemical plating, and coating. The first composite strip is slit and cut into first blanks of a preset size, and the first blanks are trimmed and chamfered using a preset tool to generate the corresponding composite blanks.

3. The preparation method according to claim 2, characterized in that, Composite strips laminated to the target thickness using a pre-defined composite process include: By using a lamination process, a first thin strip corresponding to the first magnetic metal material and a first thick strip corresponding to the second magnetic metal material are combined to generate a first composite strip. The first composite strip is annealed in an annealing furnace to generate the composite strip. The temperature inside the annealing furnace during annealing is 650-950°C, and the annealing furnace is set to a vacuum state or injected with protective gas.

4. The preparation method according to claim 1, characterized in that, According to a preset composite molding method, the first magnetic metal material and the second magnetic metal material are composited into a composite wire blank, including: After placing the first magnetic metal material in the shape of a thick, round rod into a preset drawing die, the first magnetic metal material in the shape of a thick, round rod is drawn out from the die hole of the drawing die by a preset clamp, and after multiple drawing operations, a first thin metal rod is obtained, wherein the cross-sectional diameter of the first thin metal rod is 0.3 mm to 5 mm; After rolling, rotating, and curling operations are performed on the strip-shaped second magnetic metal material, the curled semi-circular tube is welded into a round tube, and the round tube is drawn multiple times to obtain a hollow tube, wherein the inner diameter of the hollow hole of the hollow tube is larger than the cross-sectional diameter of the first metal rod. After the first metal rod is nested in the hollow tube, the resulting metal blank is subjected to multiple drawing and annealing operations. After the first metal rod and the hollow tube are tightly bonded together, the bonded metal blank is extruded and drawn to obtain the composite wire blank.

5. The preparation method according to claim 1, characterized in that, According to a preset composite molding method, the first magnetic metal material and the second magnetic metal material are composited into a composite wire blank, including: At least one strip-shaped first magnetic metal material and second magnetic metal material that have undergone surface treatment are laminated together to form a second composite strip of the target thickness; The composite tube is formed after the second composite strip is subjected to rolling, rotary pressing and coiling operations.

6. The preparation method according to claim 5, characterized in that, The first magnetic metal material comprises an iron-nickel-based alloy, wherein the weight percentage of nickel is 35-88 wt% and the weight percentage of iron is 12-65 wt%.

7. The preparation method according to claim 6, characterized in that, The second magnetic metal material includes a neodymium-iron-boron-based alloy, wherein the weight percentage of neodymium is 15-28 wt%, the weight percentage of iron is 70-80 wt%, and the weight percentage of boron is 1-8 wt%.

8. A sensing metal wire, prepared using the preparation method according to claim 2, characterized in that, The device includes a first magnetic metal material and a second magnetic metal material, wherein the first magnetic metal material and the second magnetic metal material are pressed together as solid wires. The metal material corresponding to the first magnetic metal material includes one of the following: nickel elemental metal, iron-nickel based alloy, neodymium iron boron based alloy, Invar alloy, Kovar alloy, and / or the metal material corresponding to the second magnetic metal material includes one of the following: iron elemental metal, cobalt elemental metal, neodymium iron boron based alloy, iron-chromium-cobalt based alloy, iron-chromium-aluminum based alloy, magnetic stainless steel, samarium-cobalt based alloy, aluminum-nickel-cobalt based alloy, iron-chromium-cobalt based alloy.

9. A sensing metal wire, prepared using the preparation method according to claim 4, characterized in that, The material comprises an inner metal layer and an outer metal layer, wherein the inner metal layer is embedded within the outer metal layer, and the inner and outer metal layers are compositely formed into solid wires stacked radially from the inside out. The inner metal layer material comprises one of the following: nickel, iron-nickel based alloy, neodymium-iron-boron based alloy, Invar alloy, Kovar alloy, and / or the outer metal layer material comprises one of the following: iron, cobalt, neodymium-iron-boron based alloy, iron-chromium-cobalt based alloy, iron-chromium-aluminum based alloy, magnetic stainless steel, samarium-cobalt based alloy, aluminum-nickel-cobalt based alloy, iron-chromium-cobalt based alloy.

10. A sensing metal wire, prepared using the preparation method according to claim 5, characterized in that, The device includes an inner magnetic metal material and an outer magnetic metal material arranged sequentially along its radial outer periphery. The inner magnetic metal material and the outer magnetic metal material are stacked together as solid wires or hollow wires. The inner magnetic metal material is made of one of the following materials: iron elemental metal, cobalt elemental metal, neodymium iron boron-based alloy, iron-chromium-cobalt-based alloy, iron-chromium-aluminum-based alloy, magnetic stainless steel, samarium-cobalt-based alloy, aluminum-nickel-cobalt-based alloy, iron-chromium-cobalt-based alloy, and / or the outer magnetic metal material is made of one of the following materials: nickel elemental metal, iron-nickel-based alloy, neodymium iron boron-based alloy, Invar alloy, Kovar alloy.

11. The sensing wire according to claim 10, characterized in that, The hollow wire has a circular or C-shaped cross-section.

12. A type of cigarette cartridge, characterized in that, The device includes cigarette paper, a filter section, a cooling section, and a matrix section. The filter section, the cooling section, and the matrix section are arranged sequentially along the axial direction and wrapped inside the cigarette paper. The matrix section includes sensing metal wires and aerosol matrix as described in any one of claims 10 to 11, and a shaping paper. Multiple sensing metal wires are embedded in the aerosol matrix, and the shaping paper is wrapped around the outer surface of the aerosol matrix.

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