Electromagnetic heating cartridge with improved performance

Abstract

The utility model provides an electromagnetic heating cartridge with improved performance, which comprises a hollow support tube and a heating tube, the size of the heating tube is smaller than that of the support tube, and the heating tube is nested in the support tube; an aerosol forming substrate is arranged in a hollow cavity of the heating pipe, and magnetic metal foil is arranged on the wall of the heating pipe. Through the function separation of the mechanical supporting tube and the heating tube which are designed in a nested manner, the production process is simplified, the universality is enhanced, the coupling stability of the sensors and a high-frequency alternating electromagnetic field is ensured due to the symmetrical distribution of the annular foil sensors and the electromagnetic circumferential heating mode, and the heating efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of heated non-combustible tobacco technology, specifically to an electromagnetically heated tobacco cartridge with improved performance. Background Technology

[0002] Electromagnetic heating non-combustible technology is known in the heated cigarette industry. It requires a ferromagnetic or subferromagnetic sensor as a heat source, which is excited by the high-frequency alternating electromagnetic field generated by the coil in the cigarette device, thereby generating eddy current heating. This heat bakes the aerosol-generating matrix in the cartridge, releasing smoke that can be inhaled. Commercially available products have two configurations based on the cartridge's structural design and heating mode: internal electromagnetic central heating and external electromagnetic circumferential heating.

[0003] In applications of internal electromagnetic central heating, a commercially available product employs a method where the cartridge contains a sensor. This involves embedding a thin, sheet-like sensor into the central region of a columnar aerosol-generating matrix. The sensor is longitudinally distributed along the axis. When the cartridge is inserted into the cartridge compartment of the device and is operating normally, the heat generated on the sheet-like sensor is conducted from the central region of the aerosol-generating matrix to the outer regions. However, this method presents challenges in embedding the sheet-like sensor, making it difficult to accurately position it along the axis of the aerosol-generating matrix. Furthermore, the limited contact area between the sensor and the aerosol-generating matrix hinders the achievement of rapid heating and uniform carbonization.

[0004] In external electromagnetic circumferential heating applications, the smoking device includes a sensor, while the cartridge does not. The sensor is manufactured in a cylindrical shape and integrated into the inner surface of the cartridge compartment. When the cartridge is inserted and operating normally, the heat generated on the cylindrical sensor is conducted from the inner surface of the cartridge compartment to the outer circumferential surface (side) of the cartridge, penetrating the cartridge paper tube, and then further conducted into the aerosol-generating matrix. In this case, the heat loss not acting on the aerosol-generating matrix is ​​significant, resulting in slow smoke output. Furthermore, the first few puffs may exhibit low smoke volume and a pasty taste, leading to a poor user experience.

[0005] It is evident that both internal electromagnetic central heating and external electromagnetic circumferential heating configurations have their functional defects, making it particularly necessary to propose the electromagnetic heating cartridge tube and cartridge with improved performance as described in this utility model application. Utility Model Content

[0006] To address the aforementioned problems in the prior art, this utility model provides an electromagnetic heating cartridge, comprising a hollow support tube and a heating tube, wherein the size of the heating tube is smaller than that of the support tube and the heating tube is nested inside the support tube; an aerosol matrix is ​​provided inside the hollow cavity of the heating tube, and a magnetic metal foil is provided on the wall of the heating tube.

[0007] Furthermore, the heating tube is made of a strongly magnetic metal foil and a liner paper, with the strongly magnetic metal foil at least partially located on the inner wall.

[0008] Furthermore, the liner paper is heat-modified paper or tobacco-modified paper, and one or more of nicotine, nicotine salts, or tobacco components are incorporated into the liner paper.

[0009] Furthermore, the length of the heating tube is less than the length of the support tube, and the outer diameter of the heating tube is less than the outer diameter of the support tube.

[0010] Furthermore, it also includes plugs and cooling components that abut against both ends of the heating tube.

[0011] Furthermore, the metal foil is configured as a symmetrical annular metal foil.

[0012] Furthermore, the metal foil is configured to have a symmetrical structure, S 有效加热面积 With S 加热管内壁面积 The ratio is greater than 30%.

[0013] Furthermore, a high-permeability paper film is provided at the end of the heating tube near the mouthpiece.

[0014] Furthermore, the heating element is nested inside the support tube with an interference fit.

[0015] Furthermore, the magnetic metal foil can be a single-layer or multi-layer structure.

[0016] Compared with the prior art, the beneficial effects of this utility model are: by separating the functions of the nested mechanical support tube and the heating tube, the production process is simplified and its versatility is enhanced. Furthermore, due to the symmetrical distribution of the annular foil sensor and the electromagnetic circumferential heating mode, the coupling stability between the sensor and the high-frequency alternating electromagnetic field is ensured, thereby improving the heating efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a nested magnetic smoke tube structure.

[0018] Figure 2 A schematic diagram of a cigarette cartridge structure for filling a matrix with granular aerosols;

[0019] Figure 3 Micrograph of the cross-section of the heating tube metal paper. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1

[0022] like Figure 1 The diagram shows a nested magnetic cigarette tube structure, including a hollow heating tube 1, a support tube 2, a plug 3, and a mouthpiece 4. The heating tube 1 is smaller than the support tube 2, and is nested inside the support tube 2 near one end via a physical interference fit. The heating tube 1 has a length of 12mm and an outer diameter of 6.4mm, while the support tube 2 has a length of 45mm and an outer diameter of 7mm. The plug 3 and mouthpiece 4 are respectively attached to both ends of the heating tube 1 and fixed in place. The selection of the outer diameter and length is primarily for applications requiring heat-not-burn technology. Considering factors such as the size of the cigarette cartridge, the volume of the coil windings, and assembly, the specific outer diameter and length are selected based on actual conditions.

[0023] In other embodiments, when the heating tube 1 is nested within the support tube 2, it can be bonded with adhesive, pressed, or snapped in addition to an interference fit. Preferably, adhesive bonding is used, and the types of adhesives selected include silicone adhesives, epoxy resin adhesives, acrylic adhesives, polyurethane adhesives, and rubber adhesives. An important performance indicator for these adhesives is that they must be able to withstand certain high temperatures, up to 400°C, without significant deformation or the release of toxic or harmful substances. To meet the harm reduction requirements of the e-cigarette cartridges, the use of food-grade adhesives is crucial in this invention.

[0024] The inner wall of the heating tube 1 is provided with a magnetic metal foil 101, which is configured as a symmetrical annular metal foil. In a specific embodiment, the heating tube 1 is a composite magnetic tube, and its base paper is metal paper, which is composed of a strongly magnetic metal foil 101 and a backing paper 102. The strongly magnetic metal foil 101 is at least partially exposed on the inner side of the heating tube 1. In one feasible embodiment, the metal foil 101 is configured as a symmetrical annular metal foil, which wraps around the inner wall of the heating tube 1 to form a complete circumferential heating. In another feasible embodiment, the metal foil 101 is not a complete annular structure, but is configured with other geometrical structures with symmetry, such as ellipse, triangle, irregular shape, etc., but considering the heating effect, the S of the geometrical structure is not considered. 有效加热面积 With S 加热管内壁面积 A ratio greater than 30% yields better heating results, and preferably more than 50%.

[0025] In one embodiment, the metal paper includes a single layer of strongly magnetic metal foil 101 with a thickness of 0.015 mm, and a single layer of backing paper 102 with a thickness of 0.08 mm, wound to form a hollow heating tube. In another embodiment, the metal paper includes two or more layers of strongly magnetic metal foil 101, wound to form a hollow heating tube with stronger magnetic induction capability.

[0026] In a preferred embodiment, the thickness of the strongly magnetic metal foil 101 is in the range of 0.003-0.03 mm, and the single-layer thickness of the backing paper 102 is in the range of 0.01-0.1 mm. A more preferred embodiment is to control the thickness of the strongly magnetic metal foil 101 between 0.015-0.02 mm and the single-layer thickness of the backing paper 102 between 0.04-0.08 mm, in order to achieve an optimal balance between electromagnetic and mechanical properties. The selection of the thicknesses of the metal foil 101 and the backing paper 102 is crucial in this invention to ensure the strength of the electromagnetic field coupling and to impart a certain mechanical strength.

[0027] In this embodiment, given that the strongly magnetic metal foil 101 inevitably comes into contact with part of the backing paper 102 during the circumferential heating process, causing the backing paper 102 to heat up, the backing paper 102 is selected from tobacco-modified paper, i.e., nicotine, nicotine salts, or tobacco components are incorporated into it. This helps to reduce the odor generated by the heating of the backing paper 102. Tobacco-modified paper refers to paper in which tobacco plants are added to the raw materials of the backing paper 102, so that it mainly releases tobacco components when heated. When the temperature reaches 300-400℃, the tobacco components contained in the tobacco-modified paper will undergo partial carbonization and pyrolysis, releasing the unique aroma of tobacco. This aroma blends with the aerosol flavor to form a comprehensive taste, which is generally acceptable to users. In another embodiment, the backing paper 102 is selected from heat-modified paper, which exhibits excellent thermal stability when the temperature reaches 300-400℃. It will not undergo combustion or violent pyrolysis reactions that release harmful substances or produce unpleasant odors, nor will it show obvious deformation or discoloration.

[0028] The strongly magnetic metal foil 101 is made of 4J42 iron-nickel soft magnetic alloy and is configured as a single-layer structure. In another embodiment, the strongly magnetic metal foil 101 is made of composite metal material and configured as a three-layer structure, which is ultimately composed of: a Cr layer with a thickness of 0.001 mm, a Ni layer with a thickness of 0.004 mm, and a stainless steel 410 layer with a thickness of 0.01 mm. This structure is used as a composite sensor component to further assist the smoking device in realizing multiple functions, such as anti-counterfeiting identification, temperature control, and recording of puff count.

[0029] The outer tube 2 is a single tube, and its base paper is ordinary paper, such as 80-gram three-layer medium-gram paper. In other embodiments, the main pulp of conventional paper is derived from plant fibers, which have a wide range of sources, including coniferous wood (such as larch, red pine, Masson pine, Yunnan pine, Scots pine, etc.), broad-leaved wood (such as poplar, birch, eucalyptus), herbaceous plants (such as reeds, bamboo, awns, wheat straw, rice straw, dragon's beard grass, sorghum stalks, bagasse), bast fibers (such as flax, jute, kenaf, sandalwood bark, mulberry bark, cotton stalk bark), seed wool fibers (such as cotton, cotton linters, cotton rags), or waste paper fibers, one or more of these.

[0030] Reference Figure 2 In this embodiment, the nested magnetic cigarette tube structure uses a metal foil 101 to form a ring-shaped foil sensor, exposed inside the heating tube 1 to provide electromagnetic heating. A support tube 2 provides mechanical support. An aerosol-generating matrix is ​​filled into the hollow cavity of the heating tube 1 to form a circumferentially electromagnetically heated cigarette cartridge. This nested cigarette tube integrates a sensor and can be used to fill various forms of aerosol-generating matrix. The assembly process is simple. Electromagnetic circumferential heating from inside the cigarette tube reduces heat loss from the external paper tube compared to external circumferential heating, lessens paper odor, and increases heating and smoke output speed. Compared to central heating from inside the aerosol-generating matrix, it increases the contact area and improves carbonization uniformity.

[0031] Firstly, the symmetrical distribution of the annular foil sensor and the circumferential electromagnetic heating mode in this embodiment ensure the coupling stability between the sensor and the high-frequency alternating electromagnetic field. This mode provides a large heating area, where the metal foil 101 is in direct and close contact with the side of the aerosol generation matrix section in an annular shape. This improves the heating effect and is suitable for filling aerosol generation matrices of various shapes, offering high flexibility. This application mode eliminates the need to pre-set the sensor in the aerosol generation matrix. Traditional processes for assembling sensors in the matrix are complex, expensive, and difficult to ensure the consistency of the sensor in the axial center region, making the sensor prone to displacement. Furthermore, the sheet-like sensors inserted in existing technologies are not symmetrically distributed in the magnetic flux. These two factors affect the coupling stability between the sensor and the high-frequency alternating electromagnetic field. In contrast, the sensor in this design is fixed in spatial shape and physical position, and its symmetrical distribution in the magnetic flux achieves a consistent and stable electromagnetic field coupling effect, overcoming the defects of asymmetrical distribution and unstable coupling of sheet-like sensors in existing technologies.

[0032] Secondly, the separation of functions between the heating tube 1 and the support tube 2 reduces the complexity of the manufacturing process. The support tube 2 primarily functions as a mechanical support and can be manufactured as a thicker, rigid paper tube; the heating tube 1 primarily functions as an electromagnetic heating element and can be manufactured as a thinner, soft, composite magnetic tube. Separating the functions and forming processes of these two components achieves multifunctionality and simplifies the production process. By placing the metal foil 101 on the inner wall of the heating tube 1 and separating the forming steps of the support tube 2 from those of the heating tube 1, the complexity of placing the metal foil sensor in a localized area on the inner wall of the flue is reduced. The base paper for the heating tube 1 is a complete composite of the metal foil 101 and the backing paper 102, which can then be wound into a tube using various methods and cut into unit tubes, improving production efficiency. If a strong magnetic metal foil 101 is directly placed inside the support tube 2, the winding base paper must be partially laminated. Partial lamination is a complex process, and the winding process using partially laminated metal paper is limited to parallel flat winding. However, the support tube 2 is generally quite thick, and after bonding using parallel flat winding, there will be a noticeable step at the overlap. The nested structure of the two tubes further relocates the sensor heating element, and the outer wall of the heating tube 1 (liner paper 102) provides a certain degree of thermal insulation to the support tube 2, reducing its thermal impact and maintaining its integrity.

[0033] Thirdly, the scheme of first forming the smoke tube and then filling it with the aerosol generation matrix enhances the versatility of the smoke tube. The support tube 2 is made into a thicker hard paper tube, and the heating tube 1 is made into a thinner soft paper tube. After fitting together, a formed nested magnetic smoke tube is created. This can then be used to fill various forms of aerosol generation matrix, greatly expanding the applicability of this magnetic smoke tube. Suitable aerosol generation matrix forms include granular, powdered, flake-like, filament-like, folded, honeycomb-like, sponge-like, rope-like, woven fabric-wrapped, or non-woven fabric-wrapped forms. Any smoke-generating material that can be easily filled into the heating tube 1 can be used in conjunction with this nested magnetic smoke tube to prepare a smoke cartridge that is electromagnetically heated circumferentially from the inside of the smoke tube.

[0034] Continue to refer to Figure 2 This diagram illustrates a four-segment structure of a cigarette cartridge assembled from nested magnetic cigarette tubes. A particulate aerosol generating matrix 5 is filled inside a heating tube 1 and tightly wrapped by a sensor-sensitive magnetic metal foil 101. The upper end of the heating tube 1 is equipped with a breathable sponge plug 3, and the lower end is fitted with a cooling component 402, ensuring that both ends of the matrix are blocked while still allowing for air permeability. The bottom end of the support tube 2 is filled with a filter section 401, and the outer layer is wrapped with a thin, parallel-wound, bonded cigarette paper 6 to enhance a smooth and aesthetically pleasing effect.

[0035] The strongly magnetic metal foil 101 not only constitutes the annular foil sensor for heating the aerosol generating matrix 5, but also serves as a leakage protection shield for the aerosol generating matrix 5, preventing the liquid phase components in the aerosol generating matrix 5 from corroding the heating tube 1 and the support tube 2. In this structure, the main functions of the heating tube 1 include eddy current heating and leakage prevention, namely providing the annular foil sensor, containing the aerosol generating matrix 5, and preventing the liquid phase components in the aerosol generating matrix 5 from corroding the lining paper 102 in the heating tube 1 and the support tube 2. The main function of the support tube 2 is to integrate the internal units to form a complete smoke cartridge, providing mechanical support to ensure its stability and reliability.

[0036] During the coupling process with the electromagnetic heating device, the strongly magnetic metal foil 101 acts as a sensor to circumferentially heat the aerosol generating matrix 5. This circumferential heating starts from the inside of the heating tube 1 and diffuses from the outside to the central region. Furthermore, the lining paper 102 on the other side has a certain blocking and absorption effect on the outward heat transfer, reducing the thermal impact on the outermost support tube 2. Compared with circumferential heating originating from the outside of the support tube 2, this electromagnetic circumferential heating mode originating from the inside of the heating tube 1 has a faster heat conduction speed and less heat loss, and can reduce the papery smell caused by a large amount of heat penetrating the thicker paper tube.

[0037] In a preferred embodiment, in addition to ensuring that both ends of the substrate are blocked and have air permeability by providing a cooling element 402 with the heating tube 1, it is also feasible to provide a high-permeability paper membrane at the end near the mouthpiece. The high-permeability paper membrane can allow the smoke generated by the smoke generator to pass through and be transmitted to the mouthpiece end through the internal cavity. The high-permeability paper membrane is attached to the heating tube 1 with adhesive.

[0038] Example 2

[0039] A manufacturing method for the electromagnetic heating cartridge in Embodiment 1 includes steps such as paper preparation, winding, shaping and cutting, assembly and filling.

[0040] In the preparation of the base paper, a strong magnetic metal foil is laminated with a thin liner paper to form a metal paper. For the support tube, a three-layer medium-grammage paper, such as 80-grammage (approximately 80 micrometers) ordinary paper, is used for winding. For the heating tube, the metal paper is first prepared by laminating a strong magnetic metal foil with a thin liner paper. For example, a 15-micrometer-thick soft magnetic alloy 1J94 metal foil is laid flat, glued, and pressed with 25-grammage tissue paper (approximately 25 micrometers thick) to form the metal paper; then, a three-layer metal paper is used for winding. The metal foil and liner paper are laminated together using an adhesive and a hot-pressing method. The main steps include: alignment adjustment, adhesive application, calendering, baking and curing, winding, and trimming. Key parameters of this process include: selection of metal foil and liner paper thickness, tension control of metal foil and liner paper, hot press roller temperature, hot press roller pressure, belt feed speed, baking temperature, and time. By optimizing these parameters, metal paper with thinner overall thickness, lighter weight, and higher bonding strength can be produced.

[0041] In the winding process, metallic paper is wound to form a heating tube strip, and ordinary paper is wound to form a support tube strip. The base paper is wound onto a mandrel, and the winding tension, angle, and number of layers are controlled. Specific winding methods can include parallel winding, spiral winding, cross winding, or a combination of these methods. Parallel winding refers to continuously winding the base paper along its length into a cylindrical shape, with the edges of the base paper arranged parallel to each other. This method provides a smoother tube wall. Spiral winding refers to spirally winding the base paper onto the mandrel at a certain angle to form a spiral paper tube. This method can improve the strength and bending resistance of the paper tube. Cross winding refers to winding the base paper onto the mandrel in a crisscross pattern to form a mesh-like paper tube. This method can improve the air permeability and compressive strength of the paper tube. Hybrid winding refers to a winding method that combines parallel winding, spiral winding, and cross winding to meet different performance requirements.

[0042] During the cutting process, the heating tube strips and support tube strips are shaped, cooled to room temperature, and then cut into the required lengths. The wound paper tubes are heated, heated, or otherwise treated to shape and maintain their shape, then cooled to room temperature and cut into the required length units.

[0043] During assembly, the heating element is embedded inside the support tube, and the plug is placed at the end of the heating element. As mentioned earlier, the heating element is smaller than the support tube, making assembly simpler and facilitating the formation of a nested structure.

[0044] In the filling step, the aerosol forming matrix is ​​filled into the heating tube. In this embodiment, a particulate aerosol forming matrix is ​​used, which is filled into the heating tube and tightly wrapped by the sensor metal foil.

[0045] This nested smoke tube integrates a sensor and can be used to fill various forms of aerosol generation matrix. The assembly process is simple. Electromagnetic circumferential heating is performed from inside the smoke tube. Compared with circumferential heating from the outside of the smoke tube, it reduces the heat loss of the external paper tube, reduces paper odor, and improves the heating and smoke output speed. Compared with central heating from inside the aerosol generation matrix, it increases the contact area and improves carbonization uniformity.

[0046] Example 3

[0047] To further illustrate the structural composition, a microstructural analysis was performed on the cross-section of heating tube 1. The sample already wound into heating tube 1 was sectioned, and its local microstructure was observed using a scanning electron microscope. The results are as follows: Figure 3 As shown, it can be clearly seen that the strongly magnetic metal foil 101 is located on the inner side of the composite magnetic tube, and the liner paper 102 is located on the outer side, with the two tightly bonded together. High-magnification measurement shows that the wall thickness of the composite magnetic tube is approximately 0.1 mm.

[0048] To verify the strength of the electromagnetic cigarette cartridge in this embodiment, the peel strength of the metal paper was evaluated, and two sets of samples (#1 and #2) were selected for testing and analysis. The samples were laminated using a 0.08mm thick backing paper 102, a 0.015mm thick strong magnetic metal foil 101, and Xuchuang WS571-B adhesive through calendering. After lamination, the samples were kept at an ambient temperature of 20°C and a relative humidity of 65% for 48 hours and then allowed to air dry naturally. An opening was made at the beginning of the calendering process to facilitate the peel test, and the peel speed was 30mm / s. The peel strength results are shown in Table 1.

[0049] The results show that the peel strength of the strong magnetic metal foil 101 is between 0.28 and 0.30 N / mm, indicating that the adhesive has good bonding force with the strong magnetic metal foil 101 and the backing paper 102. This strength is sufficient to withstand the stress during the subsequent paper tube winding and aerosol matrix filling process, effectively preventing delamination and ensuring the stability of the composite magnetic tube structure.

[0050] Table 1: Peel strength test results of a type of metallic paper

[0051] serial number Force value (unit: N) Width (unit: mm) Peel strength (unit: N / mm) 1 3.7 12.49 0.30 2 3.2 11.25 0.28

[0052] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic heating cartridge having improved performance, characterized by, The hollow support tube and the heating tube are provided, the size of the heating tube is smaller than that of the support tube, and the heating tube is nested in the support tube; an aerosol forming substrate is arranged in the hollow cavity of the heating tube, and a magnetic metal foil is arranged on the wall of the heating tube.

2. The electromagnetic heating cartridge of claim 1, wherein, The heating tube is wound by a strong magnetic metal foil and a backing paper, and the strong magnetic metal foil is arranged at least partially on the inner wall. 3.The electromagnetic heating cartridge of claim 1, wherein, The length of the heating tube is smaller than the length of the support tube, and the outer diameter of the heating tube is smaller than the outer diameter of the support tube.

4. The electromagnetic heating cartridge of claim 1, wherein, The plug and the cooling member are respectively abutted with both ends of the heating tube.

5. The electromagnetic heating cartridge of claim 1, wherein, The metal foil is configured as a symmetrical annular metal foil. 6.The electromagnetic heating cartridge of claim 1, wherein, The metal foil is configured to have a symmetrical structure, S 有效加热面积 The ratio of S 加热管内壁面积 is greater than 30%. 7.The electromagnetic heating cartridge of claim 1, wherein, The heating tube is provided with a high-transparency paper film at one end close to the mouthpiece.

8. The electromagnetic heating cartridge of claim 1, wherein, The heating tube is nested in the support tube through interference fit. 9.The electromagnetic heating cartridge of claim 1, wherein, The magnetic metal foil is a single-layer structure or a multi-layer structure.

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