Electromagnetic induction heating cigarette

Abstract

The utility model provides a kind of electromagnetic induction heating cigarette, comprising: smoke section, along axial extension, inside fill with multiple cut tobacco, wherein, at least part cut tobacco is composite cut tobacco, composite cut tobacco includes induction metal core and the tobacco sheet of cladding in the outer periphery of induction metal core, induction metal core can in the heat generated in induction in alternating magnetic field to heat tobacco sheet, to heat smoke section to produce aerosol in turn.Using the above technical scheme, airflow resistance can be significantly reduced, the consistency of atomization effect is ensured, and the heat utilization efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of novel tobacco products technology, and in particular to an electromagnetic induction heated cigarette. Background Technology

[0002] Heated cigarettes, as a new type of tobacco product, generate an aerosol from tobacco material through heating without combustion, and have gained widespread popularity among consumers in recent years. Currently, common heating methods mainly include resistance heating and electromagnetic induction heating. In resistance heating technology, both inner core resistance heating and peripheral heating methods suffer from low heating efficiency, resulting in a long time from tobacco being heated to atomization, significantly impacting the consumer's user experience and satisfaction.

[0003] In comparison, electromagnetic induction heating technology has significant advantages. This technology generates an alternating magnetic field using high-frequency current, causing eddy currents to cut through the alternating magnetic field lines on the surface of the metal material. These eddy currents induce high-speed, random motion of metal atoms, and the collisions and friction between the atoms generate heat energy, thus achieving the heating effect. Because the heat is generated by the metal material itself, its heat conversion efficiency is far higher than traditional contact heat transfer heating methods such as resistance heating.

[0004] Existing technologies also include methods for preparing electromagnetic induction heated cigarettes, mainly in two forms: one involves combining tobacco sheets with metal foil and then rolling them into a cigarette-like structure; the other involves combining tobacco sheets with metal foil, cutting them into shreds, and then arranging the shreds into strips to form a smoking section. However, both of these methods have drawbacks.

[0005] For the first approach, directly rolling the composite sheet into a cigarette-like structure can lead to problems such as poor airflow channels, uneven heat distribution, and poor taste consistency. This is because the rolled structure has a high density and lacks effective airflow channels. At the same time, the continuous distribution of metal foil can easily cause local overheating, affecting the uniform atomization of the tobacco material.

[0006] The second approach, which involves slicing the composite sheet into filaments before filling, suffers from the problem of easily damaging the metal foil structure. During the slicing process, the metal foil is prone to breakage or cracking, preventing it from effectively utilizing its induction heating performance. Furthermore, broken metal foil is difficult to form a complete induction circuit, significantly reducing eddy current generation efficiency and affecting the heating effect. Utility Model Content

[0007] The present invention provides the following technical solution to solve the above-mentioned technical problems.

[0008] This utility model provides an electromagnetic induction heated cigarette, comprising:

[0009] The smoke-generating section extends axially and is filled with multiple tobacco strands, of which at least some are composite tobacco strands. The composite tobacco strands include an induction metal core and a tobacco sheet covering the outer periphery of the induction metal core. The induction metal core can generate heat in an alternating magnetic field to heat the tobacco sheet, thereby heating the smoke-generating section to produce an aerosol.

[0010] By adopting the above technical solution, airflow resistance can be significantly reduced, the consistency of atomization effect can be ensured, and the heat utilization efficiency can be greatly improved.

[0011] Optionally, the shear strength T of the inductive metal core satisfies: 100 MPa < T < 500 MPa.

[0012] Optionally, the number of the sensing metal cores is 2-7.

[0013] Optionally, the cross-section of the sensing metal core is circular or rectangular, and the diameter of the circle or the width of the rectangle is 40-80 μm.

[0014] Optionally, the cross-sectional area of ​​the composite tobacco does not exceed 2 mm². 2 .

[0015] Optionally, the induction metal core accounts for no more than 40% of the mass of the composite tobacco.

[0016] Optionally, the sensing metal core is made of one of the following materials: iron, cobalt, nickel, silicon, and boron.

[0017] Optionally, the tensile strength of the tobacco sheet is not less than 200 N / m, and / or the hardness of the tobacco sheet is not less than 2 N / mm. 2 .

[0018] Optionally, the thickness of the tobacco sheet is 0.2 mm to 1 mm.

[0019] Optionally, it also includes a filter section connected to the smoke-generating section. Attached Figure Description

[0020] Figure 1 A cross-sectional schematic diagram of an electromagnetic induction heated cigarette is shown in one embodiment of the present invention;

[0021] Figure 2 This diagram shows the overall structure of the composite tobacco shreds in one embodiment of the present invention.

[0022] Figure 3 A schematic diagram of the longitudinal section of the composite tobacco shreds in one embodiment of the present invention is shown;

[0023] Figure 4 A schematic diagram of the longitudinal section of the composite tobacco shreds is shown in another embodiment of the present invention;

[0024] Figure 5 This diagram shows a longitudinal cross-section of the composite tobacco shreds in another embodiment of the present invention. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0026] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0028] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0030] like Figures 1-2 As shown, this utility model provides an electromagnetic induction heated cigarette 10, comprising:

[0031] Smoke-generating section 1, along the axial direction (e.g.) Figure 1 and Figure 2Extending in the X direction, it is filled with multiple tobacco strands 7. At least a portion of the tobacco strands 7 are composite tobacco strands 4. (See reference...) Figure 2 The composite tobacco 4 includes an induction metal core 5 and a tobacco sheet 6 covering the outer periphery of the induction metal core 5. The induction metal core 5 can generate heat in an alternating magnetic field to heat the tobacco sheet 6, thereby heating the smoke-generating section 1 to produce an aerosol.

[0032] Compared to existing technologies that involve directly placing inductive metal foil into the smoke-generating section, pressing or bonding metal foil with tobacco sheets before rolling it into a cigarette, or cutting composite sheets into shreds before filling, this invention focuses on the tobacco itself. At least a portion of the tobacco is designed as a composite tobacco containing an inductive metal core and a tobacco sheet covering the core. This composite tobacco is then filled into the smoke-generating body along with ordinary tobacco, or all tobacco is designed as this composite structure before being filled. The filling process can utilize existing techniques without additional equipment adjustments. The resulting smoke-generating section naturally forms gaps for airflow, effectively preventing obstruction of the air path and ensuring smooth airflow.

[0033] The advantages of this design are threefold. First, regarding airflow characteristics, the natural gaps between the composite tobacco and ordinary tobacco, as well as between the composite tobacco itself, create a three-dimensional network of airflow channels. This significantly reduces airflow resistance, ensuring smooth airflow during inhalation and providing favorable conditions for uniform aerosol distribution. Second, in terms of heating efficiency, the composite tobacco's structural design maximizes the contact area between the metal core and the tobacco material, improving heating efficiency and energy utilization. Furthermore, the induction metal core is directly integrated within the tobacco sheet, and the composite tobacco is distributed in multiple layers within the smoking section. This ensures a uniform distribution of induction heating points throughout the smoking section, achieving more even heating distribution and effectively preventing localized overheating, thus ensuring consistent atomization. Third, regarding structural integrity, the composite tobacco of this invention is prepared by directly wrapping a tobacco sheet around the metal core while maintaining its intact structure. The entire preparation process does not involve cutting or processing the induction metal material, fundamentally avoiding the risk of metal structure damage and ensuring stable performance of the metal core's induction heating. Finally, in terms of user experience, the heated cigarette provided by this utility model does not have direct contact between the airflow and the metal core during use, but rather with the tobacco sheet or ordinary tobacco shreds. This effectively avoids sensory problems such as metallic taste that may be caused by contact with the metal core, thereby ensuring the smoking experience.

[0034] Specifically, in the above embodiments, the tobacco shreds filled into the smoking section are all composite tobacco shreds. Based on this, the heating rate and temperature distribution of the entire smoking section can be flexibly adjusted by precisely controlling the parameters of the metal core, such as material composition, geometry, size specifications, and distribution density in the composite tobacco shreds. This allows for precise control of smoke output, taste, and flavor according to the characteristics of different tobacco materials and user needs, thereby providing users with a more personalized and high-quality smoking experience.

[0035] It should be noted that the arrangement of the tobacco shreds 7 in the smoking section in the above embodiments is flexible. It can adopt a mixed arrangement of "partially ordered + partially disordered" or a fully ordered arrangement. Specifically, if an ordered arrangement is adopted, the tobacco shreds 7 can be designed to be distributed in multiple layers in the longitudinal section of the smoking section 1 (the longitudinal direction can be referred to as direction Y in Figure 1), and it is necessary to ensure that gaps are reserved between adjacent layers of tobacco shreds 7 to allow airflow to pass through, so as to ensure smooth airflow. If a disordered arrangement is adopted, the tobacco shreds 7 are naturally dispersed in the smoking section, without deliberately limiting the layered structure. It is only necessary to ensure that there is no excessive accumulation between the tobacco shreds, which can also form gaps for airflow to pass through and meet the airflow requirements.

[0036] Furthermore, in the above embodiments, the tensile strength of the tobacco sheet is not less than 200 N / m, and / or the hardness of the tobacco sheet is not less than 2 N / mm. 2 By controlling the tensile strength and / or hardness of the tobacco sheet within the aforementioned range, sufficient mechanical strength and toughness can be ensured, preventing damage or cracking during the wrapping process around the induction metal core. Simultaneously, this also helps maintain the structural integrity of the composite tobacco during subsequent processing and use, reducing production losses, improving product qualification rates, and thus ensuring product quality stability and reliability. Preferably, the tensile strength of the tobacco sheet is not less than 200 N / m and the hardness is not less than 2 N / mm. 2 .

[0037] Furthermore, in the above embodiments, the thickness of the tobacco sheet is 0.2mm-1mm. This design not only considers the heating efficiency of the tobacco sheet itself, but also fully considers its function as a heat transfer medium. Specifically, when the induction metal core is heated in an alternating magnetic field, the heat generated is first transferred to the tobacco sheet covering its outer periphery. Subsequently, the tobacco sheet, as an intermediate heat transfer medium, evenly transfers the heat to the surrounding ordinary tobacco shreds. Controlling the thickness of the tobacco sheet within the range of 0.2mm-1mm effectively avoids the problems of low heat transfer efficiency due to excessive thickness and excessive heat loss due to insufficient thickness. This ensures efficient heat transfer from the induction metal core to the tobacco sheet, and also ensures efficient heat transfer from the induction metal core to the tobacco sheet, and then from the tobacco sheet to the ordinary tobacco shreds, thereby ensuring that the tobacco material in the entire smoking section is heated evenly. Furthermore, this thickness range also balances mechanical strength and flexibility, ensuring that the tobacco sheet is not easily damaged during the process of wrapping it around the metal core, while maintaining good plasticity and adaptability, thus providing a strong guarantee for the high-quality production of composite tobacco. Preferably, the thickness of the tobacco sheet is 0.4mm-0.8mm.

[0038] Furthermore, in the above embodiments, the shear strength T of the sensing metal core satisfies: 100 MPa < T < 500 MPa. This design ensures, on the one hand, that the sensing metal core possesses sufficient structural strength, enabling it to withstand normal external forces and maintain its shape stability during processing to the required length, transportation, and use, preventing breakage or deformation. On the other hand, it also avoids adverse effects on the processing technology due to excessive strength, ensuring that the sensing metal core can be easily processed.

[0039] Furthermore, in the above embodiments, the number of induction metal cores is 2-7. For example, it can be four as shown in Figure 5. Studies have shown that the number of induction metal cores also affects their structural stability, heating efficiency, and heat utilization effect. Specifically, for metal cores with fixed specifications, increasing the number can, on the one hand, increase their cross-sectional area in the air intake direction, thereby significantly improving the overall heating capacity and accelerating the heating speed; on the other hand, it can also enhance the overall flexibility and mechanical strength of the metal core, effectively preventing it from breaking or snapping under external forces (such as contact during assembly or use) or during product molding, thus improving structural stability. However, more induction metal cores are not necessarily better. Too many cores will introduce more interfacial thermal resistance (i.e., heat loss at the interface between the metal core and the surrounding materials), leading to increased heat loss and poor heat utilization efficiency. Therefore, controlling the number of induction metal cores to 2-7 ensures sufficient heating capacity and structural stability while minimizing heat loss, ultimately achieving the best balance between rapid heating and efficient energy utilization. In particular, the number of induction metal cores is 3-5.

[0040] Furthermore, in the above embodiments, such as Figure 3 and Figure 4 As shown, the cross-section of the metal core can be circular or rectangular, with a diameter of 40-80 μm for the circle and a width of 40-80 μm for the rectangle. This design significantly increases the eddy current effect generated by the metal core material under an alternating magnetic field, while effectively reducing the influence of the skin effect, allowing the current to be distributed more evenly across the cross-section of the metal core, thereby improving energy conversion efficiency. It should be noted that the skin effect refers to the physical phenomenon where, when alternating current passes through a conductor, the current density tends to concentrate near the conductor's surface, while the current density inside the conductor is significantly reduced.

[0041] Furthermore, in the above embodiments, considering that the composite tobacco shreds need to be filled into the smoking section of the cigarette, in order to ensure a good filling effect and not affect the intake of external air from the smoking section end face during inhalation, in the above embodiments, the cross-sectional area of ​​a single composite tobacco shred does not exceed 2mm². 2 This design ensures that airflow passes smoothly between the composite tobacco shreds and regular tobacco shreds, or between the composite tobacco shreds themselves, effectively reducing overall airflow resistance and guaranteeing airflow during the smoking process, thereby enhancing the user's smoking experience.

[0042] Furthermore, in the above embodiments, the induction metal core accounts for no more than 40% of the mass of the composite tobacco. This configuration minimizes the impact of the metal core material on the tobacco density while ensuring sufficient heating power and energy conversion efficiency, making the density of the composite tobacco closer to that of traditional tobacco. In addition, this also helps maintain the flexibility and processing performance of the composite tobacco, preventing it from becoming too stiff due to excessive metal content, which would affect the filling effect and processing adaptability, thereby ensuring the overall structural stability of the cigarette and a good smoking experience.

[0043] Furthermore, in the above embodiments, the induction metal core is made of one of the following materials: iron, cobalt, nickel, silicon, and boron. Specifically, the Curie point temperature of the selected induction metal core does not exceed 450°C. It should be noted that the Curie point temperature refers to the temperature at which a magnetic material loses its ferromagnetism. By selecting a metal material with a Curie point temperature not exceeding 450°C, the maximum temperature of the tobacco during the heating process can be precisely controlled. For example, when the metal core is induction heated to its Curie point temperature, its permeability drops sharply, leading to a significant reduction in induction heating efficiency, thereby limiting further heating of the metal core. This effectively avoids combustion of the tobacco material due to excessive temperature, ensuring that the tobacco material is heated within a suitable temperature range, thus achieving an ideal atomization effect and sensory experience.

[0044] Furthermore, in the above embodiments, the relative permeability of the induction metal core is ≥100, and the resistivity is ≥10. 4 S / m. This gives the metal core material good magnetic permeability and electrical conductivity, thus ensuring good electromagnetic induction effect of the metal material and generating sufficient electromagnetic induction heat to heat the tobacco sheet, and then heat the entire smoke-generating section to produce an aerosol for the user to inhale.

[0045] Furthermore, in the above embodiments, the electromagnetic induction heated cigarette also includes a filter section connected to the smoke-generating section.

[0046] This utility model also provides a method for preparing composite tobacco shreds, used to prepare composite tobacco shreds in electromagnetic induction heated cigarettes in any of the above embodiments. The method employs a concentric extrusion die and an extruder. The concentric extrusion die includes a core with a hollow structure and a sleeve fitted around the core. An annular cavity is formed between the core and the sleeve. Specifically, the extruder can be a twin-screw extruder. The method includes:

[0047] Preparation of the mixture: The raw materials used to prepare tobacco sheets are mixed and kneaded to form a plastic mixture. The raw materials include tobacco powder, binder, and atomizing agent. Specifically, the mixture can be kneaded in a kneader at 30-60°C for 5-15 minutes to form a plastic mixture.

[0048] Feeding: Install the concentric extrusion die at the die head position of the extruder to ensure that the die core and the die sleeve are concentric. Then preheat the die to 30-60℃. After that, fill the annular cavity with the plastic mixture and place the induction metal core in the hollow structure of the die core.

[0049] Molding: Under the action of the extruder, composite tobacco shreds are obtained by extrusion molding. Specifically, the plastic mixture can be quantitatively filled into the annular cavity of the die through the extruder feeding system, while the induction metal core is precisely placed in the hollow structure of the die core through a special feeding device. Then, the twin-screw extruder is started, and the material is compacted, plasticized and extruded at an extrusion speed of 1-10 m / min.

[0050] The above technical solution can rapidly produce composite tobacco with stable structure and quality, greatly improving production efficiency and making it suitable for large-scale industrial production.

[0051] Furthermore, in the above embodiments, the extruded composite tobacco shreds are actually continuous composite tobacco shreds, which are too long to be directly used for filling. Therefore, the extruded continuous composite tobacco shreds can be first cooled at 10-30℃ for 5-30 seconds as a buffer, and then dried at 60-90℃. High-temperature drying of the composite tobacco shreds is used, but the drying temperature should not be too high, as this may cause the tobacco aroma substances to volatilize and dissipate; nor should it be too low, as this may affect the drying efficiency. Finally, the dried continuous composite tobacco shreds are cut into specific lengths, which can then be directly used to fill the smoking section of the cigarette. Excessive length may cause the composite tobacco shreds to break easily or cross-link during filling, affecting the filling process; while excessive length may affect the heating effect of the metal core. Preferably, the cut length L of the composite tobacco shreds satisfies the condition 5mm ≤ L ≤ 20mm. Finally, the finished composite tobacco shreds are obtained through screening and grading.

[0052] Furthermore, in the above embodiments, the extruded composite tobacco shreds are continuous long strips, which are too long to be directly used for filling. Therefore, this method further includes the following post-processing steps after the forming step:

[0053] Drying: The extruded continuous composite tobacco shreds undergo a cooling and shaping process, being cooled at 10-30℃ for 5-30 seconds to stabilize the tobacco structure and strengthen the adhesion of the internal components, preventing deformation during subsequent processing. Subsequently, the cooled and shaped continuous composite tobacco shreds are dried in an environment of 60-90℃. This temperature range is chosen to avoid excessively high temperatures that could cause the aroma compounds in the tobacco to volatilize and dissipate, affecting the sensory quality of the final product, and to avoid excessively low temperatures that could prolong drying time and reduce production efficiency.

[0054] Shredding: The dried continuous composite tobacco shreds are cut into segments of a specific length. The choice of cutting length is crucial to product performance. Too long a length may cause the composite tobacco shreds to break easily during subsequent processing and use, or to cross-link when filled into the smoking section, affecting filling uniformity and airflow distribution; while too short a length may affect the heating effect and heat transfer efficiency of the metal core. Preferably, the shredded length L of the composite tobacco shreds satisfies 5mm ≤ L ≤ 20mm, more preferably 8mm ≤ L ≤ 15mm.

[0055] After cutting, the composite tobacco shreds can be screened and graded to remove products that are not up to standard in length, have incomplete structure, or contain impurities, ultimately obtaining finished composite tobacco shreds with uniform quality and stable performance. These can be directly used to fill the smoking section of a cigarette. Finally, the smoking section 1, cooling section 2, and filter section 3 are assembled according to standard cigarette manufacturing processes to obtain heated cigarette 10 (refer to...). Figure 1 ).

[0056] Furthermore, in the above embodiments, the raw material formulation for preparing tobacco sheets can be adjusted and optimized according to product requirements. In addition to tobacco powder, adhesive, and atomizing agent, exogenous fibers and flavorings can be selectively added to improve the physical properties and sensory quality of the product. Specifically, the mass ratio of each component is: 60-80 parts tobacco powder, 0-5 parts exogenous fiber, 1-5 parts adhesive, 10-25 parts atomizing agent, 0-10 parts flavoring, and 5-20 parts water. Specifically, the adhesive is composed of one or more of carboxymethyl cellulose, pectin, and sodium alginate. The atomizing agent is composed of one or a combination of glycerol and propylene glycol.

[0057] The above technical solution will be further described below with reference to specific embodiments.

[0058] Example 1

[0059] The composite tobacco shreds are filled into the smoking section, and then the smoking section 1, cooling section 2, and filter section 3 are assembled according to the standard cigarette manufacturing process to form a heated cigarette 10 as shown in Figure 1. The composite tobacco shreds are distributed in multiple layers in the longitudinal section of the smoking section, and gaps are left between adjacent tobacco shreds to allow airflow.

[0060] The composite tobacco in this embodiment has the following characteristic parameters:

[0061] The tobacco sheet has a tensile strength of 200 N / m, a hardness of 2 N / mm², and a thickness of 0.3 mm. The induction metal core material in the composite tobacco is permalloy 1J85, which has an electrical conductivity of 9 × 10⁻⁶. 5 The relative permeability is as high as 40,000. The cross-section of the induction metal core is circular with a diameter of 50 μm. The diameter of the composite tobacco is 250 μm and the length is 30 mm. Each composite tobacco contains one induction metal core. The shear strength T of the induction metal core is 300 MPa. The induction metal core accounts for 30% of the mass of the composite tobacco.

[0062] Example 2

[0063] Similar to Example 1, except that the cross-section of the sensing metal core in this example is rectangular with dimensions of 200μm×50μm; the cross-section of the composite tobacco is also rectangular with dimensions of 200μm×1mm.

[0064] Example 3

[0065] Similar to Example 1, except that the induction metal core material in the composite tobacco is made of alloy Q345B (a steel grade specified in Chinese national standard GB / T 1591-2018).

[0066] Comparative Example 1

[0067] After the tobacco sheets are shredded, the tobacco shreds are filled into the smoking section. Then, the smoking section, cooling section, and filter are assembled into a heated cigarette according to the standard cigarette manufacturing process. The tobacco shreds are 20 μm thick, 1 mm wide, and 30 mm long.

[0068] Next, performance tests were conducted. The heating cigarette device H1 with inner core needle heating device (heating needle directly contacts the tobacco shreds for heating, maximum temperature 300℃) in Comparative Example 1 and the heating cigarette device H2 with electromagnetic heating device (alternating electric field frequency 6.7MHz) in Examples 1-3 were used. Both devices were set with a preheating time of 15 seconds and a heating duration of 240 seconds.

[0069] A standard smoking machine was used to conduct vaping tests on each sample. The vaping parameters were set as follows: vaping volume 55.0 mL, puffing frequency 30.0 seconds, single puff duration 2.0 seconds, bell-shaped vaping curve, and 8 puffs per cigarette. A 44 mm Cambridge filter was used to capture aerosols at the outlet of the smoking machine. The mass difference before and after filter capture was calculated by weighing to obtain the aerosol capture amount (ACM) of each sample. At the same time, the Cambridge filter with captured aerosols was solvent extracted, and the nicotine content in the extract was detected by gas chromatography as the nicotine release amount of each sample. Finally, all test results were recorded in Table 1.

[0070] Table 1

[0071]

[0072] As shown in Table 1, compared to Comparative Example 1, the heated cigarettes in each embodiment show significant improvements in aerosol capture (ACM) and nicotine release. This is mainly due to the composite tobacco structure of this invention, which allows for a larger heating area and more uniform and thorough heating of the tobacco material. Specifically, in Example 1, the induction metal core is made of a material with relatively high magnetic permeability, resulting in a stronger induced current under the action of an alternating magnetic field, thereby improving the induction heating effect. Therefore, its ACM and nicotine release are higher than in Example 3. Example 2 increases the size of the induction metal core material based on Example 1, enabling it to receive more magnetic induction lines and improving the utilization rate of magnetic field energy. Therefore, its ACM and nicotine release are higher than in other embodiments. These results indicate that by optimizing the size of the metal core material and selecting a material with high magnetic permeability, the induction heating efficiency of the composite tobacco can be effectively improved, thereby increasing aerosol and nicotine release and improving the smoking experience of heated cigarettes.

[0073] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An electromagnetic induction heated cigarette, characterized in that, include: The smoke-generating section extends axially and is filled with multiple tobacco strands, of which at least some are composite tobacco strands. The composite tobacco strands include an induction metal core and a tobacco sheet covering the outer periphery of the induction metal core. The induction metal core can generate heat in an alternating magnetic field to heat the tobacco sheet, thereby heating the smoke-generating section to produce an aerosol.

2. The electromagnetic induction heated cigarette according to claim 1, characterized in that, The shear strength T of the induction metal core satisfies: 100 MPa < T < 500 MPa.

3. The electromagnetic induction heated cigarette according to claim 1, characterized in that, The number of the sensing metal cores is 2-7.

4. The electromagnetic induction heated cigarette according to claim 1, characterized in that, The cross-section of the inductive metal core is circular or rectangular, and the diameter of the circle or the width of the rectangle is 40-80 μm.

5. The electromagnetic induction heated cigarette according to claim 1, characterized in that, The cross-sectional area of ​​the composite tobacco does not exceed 2 mm. 2 .

6. The electromagnetic induction heated cigarette according to claim 1, characterized in that, The induction metal core accounts for no more than 40% of the mass of the composite tobacco.

7. The electromagnetic induction heated cigarette according to claim 1, characterized in that, The sensing metal core is made of one of the following materials: iron, cobalt, nickel, silicon, and boron.

8. The electromagnetic induction heated cigarette according to claim 1, characterized in that, The tobacco sheet has a tensile strength of not less than 200 N / m and / or a hardness of not less than 2 N / mm. 2 .

9. The electromagnetic induction heated cigarette according to claim 1, characterized in that, The thickness of the tobacco sheet is 0.2mm-1mm.

10. The electromagnetic induction heated cigarette according to claim 1, characterized in that, It also includes a filter section connected to the smoke-generating section.

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