Heated cigarette rod

Abstract

The application provides a heated cigarette, comprising: a cigarette body; a sealing film arranged at an insertion end of the cigarette body and comprising: a bonding layer adhered to an end face of the insertion end; a protective layer arranged at an outer layer of the bonding layer; a guide slot formed in a middle part of the sealing film and penetrating through the bonding layer and the protective layer, in a process in which a heating rod is inserted into the cigarette body from outside, the bonding layer and the protective layer are expanded along the guide slot to form a socket under the action of the heating rod, so that the heating rod is allowed to pass through the socket and be inserted into the cigarette body; and after the heating rod is pulled out, the guide slot is closed again by the elasticity of the protective layer, so that the insertion end is maintained to be sealed.

Description

Technical Field

[0001] At least one embodiment of this application relates to the field of tobacco product technology, and more particularly to a heated cigarette stick. Background Technology

[0002] Heated cigarettes are a new type of tobacco product that produces an aerosol by heating rather than burning tobacco materials. To obtain sufficient smoke and a good sensory experience, high levels of smoke-generating agents such as glycerin and propylene glycol are usually added to the tobacco segments. Existing heated cigarette sticks typically consist of a filter segment, a hollow segment, and tobacco segments. When in use, the cigarette stick is inserted into a special heating device, where an external heat source heats the tobacco segments to produce an aerosol.

[0003] However, there is a common problem with existing heated cigarettes: the tobacco material at the end of the tobacco shreds is easily carbonized after heating. When the cigarette is pulled out of the heating device, the carbonized tobacco fragments are easy to fall off and remain in the heating chamber, causing inconvenience to the user in cleaning. Summary of the Invention

[0004] In view of this, this application provides a heated cigarette stick that can effectively prevent carbonized tobacco from falling off.

[0005] According to an embodiment of this application, a heated cigarette is provided, comprising: a cigarette body; a sealing film disposed at the insertion end of the cigarette body, and comprising: an adhesive layer adhered to the end face of the insertion end; and a protective layer disposed on the outer layer of the adhesive layer; a guide slit is formed in the middle of the sealing film, penetrating the adhesive layer and the protective layer; during the insertion of an external heating rod into the cigarette body, the adhesive layer and the protective layer are stretched open along the guide slit under the action of the heating rod to form an insertion port, allowing the heating rod to pass through the insertion port and be inserted into the cigarette body; after the heating rod is pulled out, the guide slit closes again due to the elasticity of the protective layer to maintain the seal on the insertion end.

[0006] According to an embodiment of this application, the sealing film is circular, the diameter of the sealing film is larger than the outer diameter of the cigarette body, and the portion of the sealing film extending beyond the insertion end is adhered to the outer wall of the cigarette body.

[0007] According to an embodiment of this application, the guide seam includes at least two intersecting cuts that extend radially outward through the axis of the cigarette body.

[0008] According to an embodiment of this application, the guide seam includes two cuts, the extension directions of which are orthogonal.

[0009] According to an embodiment of this application, the maximum opening size of the cut in its natural state is smaller than the outer diameter of the heating rod, so that when the heating rod is inserted, the guide slit is forced to expand elastically, and after the heating rod is pulled out, the sealing film relies on the elastic deformation of the material around the guide slit when it is stretched to close the guide slit, so as to maintain the sealing of the insertion end.

[0010] According to an embodiment of this application, the length of the cut is configured to be 1 / 3 to 1 / 2 of the outer diameter of the cigarette body.

[0011] According to an embodiment of this application, the sealing film further comprises: a buffer seam extending radially outward at an angle to the cut along the axis described above.

[0012] According to an embodiment of this application, the length of the buffer seam is 1 / 10 to 1 / 5 of the length of the cut.

[0013] According to an embodiment of this application, the sealing film further includes: an intermediate layer disposed between the adhesive layer and the protective layer, the guide seam extending from the protective layer through the intermediate layer and the adhesive layer, and the intermediate layer being loaded with menthol aroma substance or tobacco essential oil.

[0014] According to an embodiment of this application, the cigarette body includes: a filter segment, a hollow segment, and a tobacco segment arranged sequentially along the axial direction, and the adhesive layer is adhered to the end face of the tobacco segment facing away from the hollow segment.

[0015] According to the heated cigarette of this application, a sealing film is provided at the insertion end of the cigarette body, and the sealing film is pre-formed with a guide slit that penetrates the adhesive layer and the protective layer. This ensures that when the cigarette is not in use, the aerosol generating matrix located in the cigarette body is completely sealed inside the cigarette body. When the heating rod is inserted, the sealing film is only stretched along the guide slit to form a temporary insertion port. After the heating rod is removed, the elasticity of the protective layer causes the guide slit to automatically close, resealing the tobacco section end. This avoids the problem of carbonized aerosol generating matrix debris falling off the end face and remaining in the heating chamber, as is common in traditional cigarettes. This eliminates the need for frequent cleaning of the heating device and improves the user experience. Attached Figure Description

[0016] The above and other objects, features and advantages of this application will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0017] Figure 1 A schematic cross-sectional view of a heated cigarette stick and heating device according to an embodiment of this application is shown;

[0018] Figure 2 A schematic side view of a heated cigarette according to an embodiment of this application is shown;

[0019] Figure 3 A schematic front view of a sealing film according to an embodiment of this application is shown;

[0020] Figure 4 A cross-sectional view of a sealing film according to one embodiment of this application is shown schematically;

[0021] Figure 5 A cross-sectional view of a sealing film according to another embodiment of this application is schematically shown;

[0022] Figure 6 A schematic front view of a sealing film according to another embodiment of this application is shown.

[0023] The annotations in the attached figures are explained as follows:

[0024] 1. Main body of the cigarette; 11. Filter section; 12. Hollow section; 13. Tobacco section;

[0025] 2. Sealing film; 21. Adhesive layer; 22. Protective layer; 23. Guide seam; 231. Cut; 24. Buffer seam; 25. Middle tear-resistant seam; 26. End tear-resistant seam; 27. Intermediate layer;

[0026] 3. Heating appliances; 31. Heating rods. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0029] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0030] When using expressions such as "at least one of A, B or C", they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, "a system having at least one of A, B or C" should include, but is not limited to, a system having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C.

[0031] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of this application. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this application.

[0032] Figure 1 The illustration schematically shows a cross-sectional view of a heated cigarette stick and a heating device according to an embodiment of this application. Figure 2 A schematic side view of a heated cigarette according to an embodiment of this application is shown. Figure 3 A schematic front view of a sealing film according to an embodiment of this application is shown.

[0033] According to embodiments of this application, a heated cigarette is provided. For example... Figures 1 to 3 As shown, the heated cigarette includes a cigarette body 1 and a sealing film 2. The sealing film 2 is disposed at the insertion end of the cigarette body 1 (e.g., ...). Figure 1 The sealing film 2 (shown as the lower end of the cigarette body 1) includes an adhesive layer 21 and a protective layer 22. The adhesive layer 21 adheres to the end face of the insertion end, and the protective layer 22 is disposed on the outer layer of the adhesive layer 21. A guide slit 23 is formed in the middle of the sealing film 2, penetrating the adhesive layer 21 and the protective layer 22. During the insertion of the external heating rod 31 into the cigarette body 1, the adhesive layer 21 and the protective layer 22 are stretched open along the guide slit 23 under the action of the heating rod 31 to form an insertion port, allowing the heating rod 31 to pass through the insertion port and be inserted into the cigarette body 1. After the heating rod 31 is pulled out, the guide slit 23 closes again due to the elasticity of the protective layer 22 to maintain the seal on the insertion end.

[0034] According to the heated cigarette of this application, a sealing film 2 is provided at the insertion end of the cigarette body 1, and the sealing film 2 is pre-formed with a guide slit 23 that penetrates the adhesive layer 21 and the protective layer 22, so that when the cigarette is not in use, the aerosol generating matrix provided in the cigarette body 1 is completely sealed inside the cigarette body 1. When the heating rod 31 is inserted, the sealing film 2 is only stretched open along the guide slit 23 to form a temporary insertion port. After the heating rod 31 is withdrawn, the elasticity of the protective layer 22 causes the guide slit 23 to automatically close again, resealing the end of the tobacco section 13. This avoids the residue of carbonized aerosol generating matrix falling off from the end face and remaining in the heating chamber in traditional cigarettes, eliminating the need for frequent cleaning of the heating device 3 and improving the user experience.

[0035] In some illustrative embodiments, the aerosol generating matrix may include at least one of reconstituted tobacco leaves, tobacco shreds, and tobacco particles.

[0036] In some illustrative embodiments, the heating device 3 includes a base and a heating rod 31. The base can be a rod-shaped or column-shaped structure. One end of the base extends radially inward to form a receiving cavity, which is used to receive and position the inserted heated cigarette, so that the cigarette can maintain a stable axial position after insertion. An installation chamber is also formed inside the base, spaced apart from the receiving cavity. The installation chamber and the receiving cavity are isolated from each other by a partition or sealing structure to prevent condensate or tobacco debris generated during cigarette use from entering the installation chamber.

[0037] The heating rod 31 extends axially from the mounting chamber into the receiving cavity. In the orthographic projection along the axial direction of the receiving cavity, the projection of the heating rod 31 is located at the center of the projection of the receiving cavity, so that when the heated cigarette is inserted, the guide slit 23 of the sealing film 2 can be aligned with the heating rod 31. The heating rod 31 is a needle-shaped or rod-shaped heating element extending upward from the base, with resistance wires or heating circuits arranged inside. It can generate heat when energized, and is used to heat the inside of the tobacco section 13 of the heated cigarette.

[0038] The installation chamber is equipped with a power supply and a control circuit that are electrically connected to the heating rod 31. The power supply is used to provide electrical energy, and the control circuit is used to adjust the heating temperature and working time of the heating rod 31 so as to provide stable electrical energy to the heating rod 31 through the power supply and control circuit.

[0039] According to embodiments of this application, such as Figure 2 As shown, the cigarette body 1 includes a filter section 11, a hollow section 12 and a tobacco section 13 arranged sequentially along the axial direction, and an adhesive layer 21 is adhered to the end face of the tobacco section 13 that is away from the hollow section.

[0040] In some illustrative embodiments, the filter segment 11 can be 7 mm long and is composed of cellulose acetate tow. The hollow segment 12 can be 26 mm long and is a polylactic acid hollow tube structure used for flue gas cooling. The tobacco segment 13 can be 12 mm long and is filled with an aerosol generation matrix. The total length of the cigarette body 1 is 45 mm, the circumference can be 22.6 mm, and the diameter can be 7.2 mm. It should be understood that the embodiments of this application are not limited to these; for example, the filter segment 11 can be 8 mm long, the hollow segment 12 can be 27 mm long, and the tobacco segment 13 can be 11 mm long.

[0041] In some illustrative embodiments, the material of the adhesive layer 21 includes at least one of polyethylene, polypropylene, and ethylene-vinyl acetate copolymer (EVA).

[0042] In some illustrative embodiments, the melting point range of the adhesive layer 21 can be configured to be greater than or equal to 60°C and less than or equal to 70°C. For example, the melting point of the adhesive layer 21 can be configured to any value among 60°C, 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 67°C, 68°C, 69°C, and 70°C.

[0043] In some illustrative embodiments, the thickness of the adhesive layer 21 can be configured to be greater than or equal to 20 μm and less than or equal to 30 μm. For example, the thickness of the adhesive layer 21 can be configured to any value among 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, and 30 μm.

[0044] In some illustrative embodiments, the material of the protective layer 22 may include at least one of aluminized polyethylene terephthalate (aluminized PET) and polyamide.

[0045] In some illustrative embodiments, the melting point of the protective layer 22 is greater than that of the adhesive layer 21. The melting point range of the protective layer 22 is configured to be greater than or equal to 160°C and less than or equal to 170°C. For example, the melting point of the protective layer 22 can be configured to any value among 160°C, 161°C, 162°C, 163°C, 164°C, 165°C, 166°C, 167°C, 168°C, 169°C, and 170°C.

[0046] In some illustrative embodiments, the thickness of the protective layer 22 can be configured to be greater than or equal to 20 μm and less than or equal to 30 μm. For example, the thickness of the protective layer 22 can be configured to any value among 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, and 30 μm.

[0047] In some illustrative embodiments, the outer surface of the protective layer (i.e., the outermost layer) of the sealing film is further provided with an anti-stick coating. This anti-stick coating can be a silicone oil coating or a fluoropolymer coating, with a thickness of 0.1–1 μm. The anti-stick coating effectively prevents cigarettes from sticking together during packaging or transportation, and also avoids unnecessary adhesion between the sealing film and the cavity wall of the heating appliance, thereby improving product packaging adaptability and ease of use.

[0048] Figure 4 A cross-sectional view of a sealing film according to one embodiment of the present application is shown schematically.

[0049] In some illustrative embodiments, such as Figure 4As shown, the adhesive layer 21 and the protective layer 22 can form a sheet substrate, which can be cut into a circular sealing film 2. The adhesive layer 21 is melted by heating (i.e., thermal activation, for example, using hot air), while the protective layer 22 and the intermediate layer 27 (described later) are melted. Figure 5 (Detailed introduction) Before melting, the adhesive layer 21 is bonded to the end face of the tobacco segment 13. After the adhesive layer 21 is cured, the sealing film 2 and the end face of the tobacco segment 13 form a strong thermal fusion bond. The material of the adhesive layer 21 and the aerosol generating matrix (e.g., tobacco fiber) permeate and cure each other, resulting in high bonding strength and heat resistance.

[0050] After the adhesive layer 21 is thermally bonded to the end face of the tobacco segment 13, the guide seam 23 in the part of the adhesive layer 21 may be temporarily filled or closed by the softened material. However, the guide seam 23 of the protective layer 22 still exists, and the entire sealing film 2 still retains a structurally weak path. The melting point of the material of the protective layer 22 (such as aluminized PET) is much higher than that of the adhesive layer 21 (such as EVA). During the thermal activation process, the protective layer 22 does not soften, and the guide seam 23 on the protective layer 22 always maintains a physically cut shape. When the adhesive layer 21 melts and flows, due to surface tension and pressure, some material may flow into the gaps in its own layer, causing temporary closure at that point. However, since this location was once cut through, there is microstructural damage and molecular chain breakage inside the material, so mechanically it still constitutes a weak zone with lower strength than the surrounding intact film area.

[0051] When the tip of the heating rod 31 presses against the center of the sealing film 2, stress first concentrates at the intersection of the guide seam 23 and the edge of the seam of the protective layer 22. Since the seam on the protective layer 22 remains, the stress is transmitted along the seam direction, forcing the previously closed weak area on the adhesive layer 21 to reopen along the original seam direction. This reopening process is guided by the seam of the protective layer 22, forming a neat and controllable opening. The sealing film 2 is stretched along the guide seam 23 to form an insertion port that matches the outer diameter of the heating rod 31, allowing the heating rod 31 to pass unobstructed into the tobacco section 13.

[0052] After the heating rod 31 is pulled out, the stretching force acting around the guide seam 23 disappears, the elastic strain energy stored in the protective layer 22 is released, driving the material on both sides of the seam to rebound, causing the guide seam 23 to automatically close. Throughout the process, the sealing film 2 does not experience uncontrollable tearing, and the ends of the tobacco section 13 are resealed after being pulled out, effectively preventing carbonized tobacco fragments from falling off.

[0053] It should be understood that the embodiments of this application are not limited to these. For example, the sealing film can also be laminated to the end face of the tobacco segment by ultrasonic welding. Alternatively, it can be laminated to the end face of the tobacco segment by laser transmission welding.

[0054] When a sealing film is laminated to the end face of a tobacco shred segment using laser transmission welding, the adhesive layer consists of a thermoplastic matrix resin and a laser absorber, with an absorption rate of not less than 80% at a wavelength of 800–1100 nm. The protective layer can be made of a light-transmitting material, such as at least one material selected from polyethylene terephthalate, polyamide, and polycarbonate, with a light transmittance of not less than 50% at a wavelength of 800–1100 nm. By selecting a combination of materials that meet the above optical parameters, it is possible to ensure that the laser energy acts efficiently on the welding interface, forming a uniform and strong fused bond layer, while reducing the thermal impact on the tobacco shred segment.

[0055] When the sealing film is laminated to the end face of the tobacco segment using ultrasonic welding, the adhesive layer is composed of at least one material selected from polyethylene, polypropylene, and ethylene-vinyl acetate copolymer, with a Vicat softening point temperature of 50–100°C. This softening point range allows the inner layer to soften and melt rapidly under ultrasonic vibration, interpenetrating and embedding with the fibers of the aerosol-generating matrix, thereby forming a high-strength fused bond layer within a short time (e.g., 0.3 seconds), while preventing excessive heat diffusion into the tobacco segment.

[0056] In some illustrative embodiments, regardless of whether hot-melt bonding, ultrasonic welding, or laser transmission welding is used, a circumferentially continuous fused bonding layer is formed between the sealing film and the end face of the tobacco segment. The thickness of the fused bonding layer is 5–30 μm, wherein the diffusion depth of the sealing film material is 3–15 μm, and the depth to which the sealing film material is embedded in the aerosol-generating matrix gaps in the end face of the tobacco segment is 2–10 μm. By controlling the above microstructural parameters, a dense, gapless bonding interface can be formed between the sealing film and the end face of the cigarette, effectively preventing leakage of tobacco fragments and giving the sealing film sufficient peel strength.

[0057] Figure 5 A cross-sectional view of a sealing film according to another embodiment of this application is shown schematically.

[0058] According to embodiments of this application, such as Figure 5 As shown, the sealing film 2 also includes an intermediate layer 27. The intermediate layer 27 is disposed between the adhesive layer 21 and the protective layer 22, and the guide seam 23 extends from the protective layer 22 through the intermediate layer 27 and the adhesive layer 21.

[0059] The intermediate layer can be loaded with at least one of the following: flavoring additives, antibacterial additives, or moisture-proof additives. This can integrate at least one of the functions of flavoring, antibacterial, and moisture-proof to meet the needs of different products.

[0060] As an example, the middle layer 27 is loaded with menthol aroma substances or tobacco puree.

[0061] As an example, loading methods include, but are not limited to: coating, spraying, printing, or adsorption by porous materials (such as porous starch, diatomaceous earth) and then composited into the intermediate layer.

[0062] In some illustrative embodiments, the melting point of the intermediate layer 27 is higher than that of the adhesive layer 21. The material of the intermediate layer 27 may include polypropylene.

[0063] In some illustrative embodiments, the thickness of the intermediate layer 27 can be configured to be greater than or equal to 25 μm and less than or equal to 35 μm. For example, the thickness of the intermediate layer 27 can be configured to any value among 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, and 35 μm.

[0064] In some illustrative embodiments, the total thickness of the seal can be configured to be greater than or equal to 75 μm and less than or equal to 85 μm. For example, the total thickness of the seal can be configured to any value among 75 μm, 76 μm, 77 μm, 78 μm, 79 μm, 80 μm, 81 μm, 82 μm, 83 μm, 84 μm, and 85 μm.

[0065] In this embodiment, the guide slit 23 also penetrates the intermediate layer 27. When the heating rod 31 is inserted, the intermediate layer 27 is also stretched along the guide slit 23, without obstructing the passage of the heating rod 31. During the heating and inhalation of the heated cigarette, the heat generated by the heating rod 31 can be partially transferred to the intermediate layer 27, causing the loaded menthol or tobacco oil to evaporate and be discharged with the mainstream smoke through the filter section 11. Menthol provides a cooling sensation, while tobacco oil enriches the natural aroma of tobacco, compensating for any potential lack of aroma in the heated cigarette.

[0066] Furthermore, the intermediate layer 27 is sandwiched between the adhesive layer 21 and the protective layer 22. The aroma substances carried by the intermediate layer 27 do not directly contact the tobacco or the external environment, reducing volatilization loss during storage and extending the product's shelf life. At the same time, the intermediate layer 27 itself has a certain strength and elasticity (such as polypropylene), which does not affect the overall mechanical properties of the sealing film 2, and the opening and closing process of the guide seam 23 remains smooth.

[0067] In some illustrative embodiments, the welding strength between the sealing film and the end face of the tobacco segment can be no less than 2.5 N / 15 mm. The depth of the heat-affected zone on the outer side of the sealing film is no greater than 1.5 mm (for ultrasonic welding) or no greater than 0.5 mm (for laser transmission welding), and the moisture content change of the tobacco segment within the heat-affected zone does not exceed 0.5%. These performance indicators ensure that the sealing film remains firm during long-term storage and use, while preventing excessive conduction of welding heat into the tobacco, which could lead to the volatilization of the smoking agent or loss of aroma.

[0068] According to an embodiment of this application, the sealing film 2 is approximately circular, and the diameter of the sealing film 2 is larger than the outer diameter of the cigarette body 1. The portion of the edge of the sealing film 2 that extends beyond the insertion end is adhered to the outer wall of the cigarette body 1.

[0069] "Approximately circular" refers to a sealing film whose overall outer contour is circular or nearly circular. Minor local deviations due to manufacturing tolerances, cutting precision, or material deformation are permissible, including but not limited to radial undulations at the edge of the sealing film not exceeding 1% of the sealing film diameter, or the sealing film being elliptical with a major-to-minor axis ratio not exceeding 1.05. This approximately circular sealing film ensures a uniform circumferential overlap between the sealing film and the cigarette insert, facilitating edge adhesion, while reducing stringent requirements for cutting precision and improving manufacturing yield.

[0070] For example, the diameter of the sealing film 2 can be configured to be 7.4 mm, and the diameter of the cigarette body 1 can be configured to be 7.2 mm.

[0071] In this embodiment, the sealing film 2 not only forms a surface contact adhesion with the end face of the tobacco section 13 through the adhesive layer on the inner surface, but also forms a circumferential covering adhesion with the outer peripheral wall of the cigarette by utilizing the edge extension, thus forming a double fixing mechanism. This can effectively resist the axial pulling force and circumferential peeling force generated during the insertion and removal of the heating rod 31, and prevent the sealing film 2 from lifting at the edge or falling off completely during use.

[0072] After the edge of the sealing film 2 extends beyond the cigarette body 1 and adheres to the outer wall, a continuous sealing interface is formed between the sealing film 2 and the cigarette body 1, eliminating any tiny gaps that may exist at the edge of the end face and preventing small tobacco fragments or smoke dust from leaking from the edge of the sealing film 2.

[0073] In addition, the edge of the sealing film 2 adheres to the outer wall of the cigarette body 1, which enhances the positioning stability of the sealing film 2 during the opening and rebound process of the guide seam 23, ensuring that the guide seam 23 is always aligned with the cigarette axis, and the heating rod 31 can be accurately inserted along the guide seam 23. At the same time, it provides a stable boundary constraint for the elastic deformation of the material around the guide seam 23, which is conducive to the accurate reset and closure of the guide seam 23 after it is pulled out.

[0074] According to an embodiment of this application, the guide seam 23 includes at least two intersecting cuts 231. The at least two intersecting cuts 231 extend radially outward through the axis of the cigarette body 1.

[0075] In some illustrative embodiments, the guide seam 23 may include two, three, or four intersecting cuts 231.

[0076] In this embodiment, at least two intersecting cuts 231 form a symmetrical expansion path at the center of the sealing film 2. When the heating rod 31 is inserted along the axis, the sealing film 2 expands uniformly outward along each cut 231, resulting in a symmetrical stress distribution. This avoids biased tearing or uneven film deformation that might occur with a single cut 231. The cuts 231 extend radially through the axis, making the effective opening area of ​​the guide slit 23 linearly related to the length of the cut 231. This allows for precise control of the insertion size after expansion by adjusting the length of the cut 231, ensuring a good match between the guide slit 23 and the outer diameter of the heating rod 31.

[0077] In some illustrative embodiments, the guide seam 23 includes two cuts 231, the two cuts 231 extending in orthogonal directions.

[0078] In this embodiment, the two orthogonal cuts 231 evenly divide the central region of the sealing film 2 into four symmetrical fan-shaped valves. When the heating rod 31 is inserted along the axis, the four valves open outwards simultaneously, and the stress is symmetrically distributed in two mutually perpendicular directions, avoiding the excessive stretching or tearing of the film to one side that may be caused by the unidirectional cut 231, and ensuring the smoothness and controllability of the opening process.

[0079] The orthogonal structure of the two cuts 231 allows the sealing film 2 and the outer periphery of the heating rod 31 to form a uniform circumferential contact after the heating rod 31 is inserted, reducing local stress concentration and facilitating the uniform storage of elastic deformation energy of the protective layer 22. After being pulled out, the four valves rebound synchronously, driving the guide slit 23 to close quickly and completely.

[0080] In addition, the orthogonal cross-shaped seam has good compatibility with the circular cross-section of the central needle-type or rod-type heating rod 31. The inserted port after being opened is approximately circular and fits the outer wall of the heating rod 31, which not only ensures smooth insertion but also avoids excessive gaps that could lead to tobacco leakage.

[0081] According to an embodiment of this application, the maximum opening size of the slit 231 in its natural state is smaller than the outer diameter of the heating rod 31, so that when the heating rod 31 is inserted, the guide slit 23 is forced to expand elastically, and after the heating rod 31 is pulled out, the sealing film 2 relies on the elastic deformation of the material around the guide slit 23 when it is stretched to close the guide slit 23, so as to maintain the sealing of the insertion end.

[0082] In this embodiment, when the heating rod 31 is inserted, because the natural opening of the guide slit 23 is smaller than the outer diameter of the heating rod 31, the heating rod 31 cannot pass through directly. The material around the guide slit 23 must be forced to elastically expand, causing the seam to be stretched to an insertion point matching the outer diameter of the heating rod 31. The interference fit between the heating rod 31 and the guide slit 23 ensures that the sealing film 2 remains in close contact with the heating rod 31 during insertion, avoiding the risk of the heating rod 31 being inserted arbitrarily due to an excessively large opening, the film not being effectively stretched, or tobacco leakage. Under normal conditions, the guide slit 23 is closed, preventing tobacco leakage; after being pulled out, the guide slit 23 closes again, preventing carbonized tobacco fragments from falling off and remaining in the heating chamber.

[0083] During the opening process, the protective layer 22 and adhesive layer 21 around the guide seam 23 undergo elastic deformation, storing elastic strain energy. When the heating rod 31 is pulled out, the opening force disappears, the stored strain energy is released, driving the material around the guide seam 23 to spring back, causing the guide seam 23 to automatically return to a closed state and reseal the port of the tobacco section 13. This self-closing mechanism requires no additional reset components or manual operation, relying entirely on the elasticity of the material itself, simplifying the structure and improving reliability.

[0084] According to an embodiment of this application, the length of the cut 231 is configured to be 1 / 3 to 1 / 2 of the outer diameter of the cigarette body 1.

[0085] For example, the length of the cut 231 can be configured to any value among 1 / 2, 2 / 5, or 1 / 3 of the outer diameter of the cigarette body 1.

[0086] In this embodiment, the length ratio of the slit 231 ensures that the diameter of the insertion port formed after the guide slit 23 is opened matches the outer diameter of the conventional heating rod 31 well. If the slit 231 is too short (less than 1 / 3 of the outer diameter), the size of the opening after opening is insufficient for the heating rod 31 to pass through smoothly, which may cause excessive insertion resistance or diaphragm tearing; if the slit 231 is too long (greater than 1 / 2 of the outer diameter), the opening after opening is too large, the fit between the heating rod 31 and the sealing film 2 decreases, tobacco fragments may leak out from the gap, and an excessively long slit 231 will weaken the structural strength of the central area of ​​the sealing film 2, increasing the difficulty of restoring closure after pulling out.

[0087] In addition, the length configuration of the slit 231 can make the stress distribution of the sealing film 2 reasonable when it is stretched. The roots of the four fan-shaped valves retain sufficient material width, which not only ensures the ability of elastic deformation, but also avoids the risk of tearing caused by stress concentration at the roots.

[0088] According to an embodiment of this application, the sealing film 2 also has a buffer slit 24. The buffer slit 24 extends radially outward through the axis of the cut 231 at an angle.

[0089] In this embodiment, the buffer slot 24 forms an additional stress relief path at the central intersection of the cross-shaped guide slot 23. When the heating rod 31 is inserted, the stress first concentrates at the tip of the buffer slot 24, and the guide crack preferentially extends a short distance along the direction of the buffer slot 24, consuming most of the strain energy and preventing uncontrollable linear tearing at the four tips of the cross-shaped slot due to stress concentration.

[0090] According to an embodiment of this application, the length of the buffer slit 24 is 1 / 10 to 1 / 5 of the length of the cut 231.

[0091] In this embodiment, the length of the buffer gap 24 is designed to ensure that it has sufficient length to guide stress concentration and crack propagation. If the buffer gap 24 is too short (less than 1 / 5 of the length of the cut 231), its tip will be too close to the center of the cross-shaped seam, and it will not be able to fully absorb the strain energy generated when the heating rod 31 is inserted, and the four tips of the cross-shaped seam may still tear. If the buffer gap 24 is too long (more than 2 / 5 of the length of the cut 231), the crack will propagate too far along the direction of the buffer gap 24, which may cause the buffer gap 24 itself to become an irreversible long crack, affecting the closure effect after extraction.

[0092] Within the length of the buffer joint 24, the buffer joint 24 can transfer the insertion stress from the 0° and 90° directions of the cross joint to the extension direction of the buffer joint 24, so that the crack stops after extending a short distance in the inclined direction, which not only consumes energy, but also avoids tearing of the main joint (i.e., the guide joint 23).

[0093] According to embodiments of this application, the angle between the extending direction of the buffer slit 24 and the extending direction of the adjacent cut 231 ranges from 40° to 50°. As an example, the angle between the extending direction of the buffer slit 24 and the extending direction of the adjacent cut 231 can be any value among 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, and 50°.

[0094] In such an embodiment, when the angle between the extension direction of the buffer slit 24 and the extension direction of the adjacent cut 231 is 45°, the buffer slit 24 is located exactly on the angle bisector of the adjacent cuts 231 (such as the 0° and 90° directions) of the cross-shaped guide slit 23, so that the stress generated when the heating rod 31 is inserted can be symmetrically distributed to the tips of the four 45° buffer slits 24, uniformly protecting the ends of the four cross-shaped cuts 231 and avoiding stress concentration in any single direction.

[0095] Figure 6 A schematic front view of a sealing film according to another embodiment of this application is shown.

[0096] In some illustrative embodiments, such as Figure 6 As shown, each cut 231 may also be provided with at least two symmetrically arranged central tear-resistant seams 25 and / or two end tear-resistant seams 26.

[0097] The extension direction of the middle tear-resistant seam 25 is orthogonal to the extension direction of the cut 231. The extension direction of the end tear-resistant seam 26 is orthogonal to the extension direction of the cut 231. The length of the middle tear-resistant seam 25 can be 1 / 2 to 4 / 5 of the length of the buffer seam 24. The length of the end tear-resistant seam 26 can be 1 / 2 to 3 / 5 of the length of the buffer seam 24.

[0098] During the use of heated cigarettes, the sealing film 2 is located at the end face of the tobacco segment 13. When the heating rod 31 is inserted, the sealing film 2 is actually located at the base of the heating rod 31 and does not directly contact the highest temperature zone of the heating rod 31. The heat is mainly transferred to the sealing film 2 through thermal radiation and heat conduction through the aerosol generation matrix. During initial thermal activation, continuous heating (e.g., 5 to 10 seconds) is required to bring the adhesive layer 21 to a melting temperature range of 60-70°C, allowing the adhesive layer 21 to fully soften, flow, and penetrate into the tobacco fibers. Subsequently, it cools and solidifies to form a strong thermally fused bonding layer.

[0099] During the user's suction process, although the heating rod 31 is energized and heating, the temperature rise at the sealing film 2 is slow (limited by heat capacity and heat conduction path), and the single suction time is usually only 2 to 3 minutes. Although the actual temperature at the sealing film 2 (80-120℃) has exceeded the initial melting temperature of the adhesive layer 21 (60-70℃), it has not yet reached the complete melting temperature of the adhesive layer 21. Taking EVA as an example, the complete melting temperature is about 120℃ to 150℃. In the range of 80℃ to 120℃, EVA is only in a softened state and will not completely melt into a free-flowing liquid. Similarly, the softening temperature of ternary copolymer polypropylene is about 105℃, and the complete melting temperature is about 140℃ to 160℃. At the operating temperature, it also only softens and does not completely melt.

[0100] Even if the adhesive layer 21 softens during inhalation, the material is firmly anchored to the tobacco fibers because a thermally fused bonding layer has already been formed during the initial thermal activation stage. The softened adhesive layer 21 material is wrapped and entangled by the aerosol-generating matrix fiber network, preventing it from flowing as a whole or detaching from the tobacco end face. In its softened state, the adhesive layer 21 only becomes more flexible and adheres more closely to the tobacco end face, unlike an unanchored adhesive layer which would slide or detach as a whole.

[0101] Furthermore, the protective layer 22 (such as aluminized PET with a melting point above 150°C) not only provides elastic resilience to the sealing film 2, but its melting point is also much higher than that of the adhesive layer 21, ensuring that it remains solid throughout the insertion and suction process of the heating rod 31, thereby maintaining the structural integrity of the guide seam 23. The sealing film 2 maintains stable adhesion and sealing performance during the insertion and suction process of the heating rod 31, and the adhesive layer 21 will not cause the sealing film 2 to detach or fail even if it remelts.

[0102] When the user finishes smoking and pulls out the heating rod 31, the main force acting on the sealing film 2 is the sliding friction between the outer wall of the heating rod 31 and the edge of the guide seam 23. Simultaneously, the sealing film 2 experiences holding force from multiple sources: firstly, the adhesive force provided by the heat-fused bonding layer; and secondly, the circumferential wrapping and fixing formed by the edge of the sealing film 2 extending beyond the tobacco end face and adhering to the outer wall of the cigarette. This edge wrapping structure acts as a mechanical fixing function, similar to a stop, ensuring that even if the adhesive layer 21 completely fails in extreme cases, the sealing film 2 will not be easily pulled out. Furthermore, before the pulling action occurs, the heating rod 31 has stopped supplying power, causing the temperature at the sealing film 2 to drop rapidly, and the adhesive layer 21 to re-solidify, further enhancing the bonding strength. The sum of the adhesive force and mechanical fixing force acting on the sealing film 2 is far greater than the friction between the heating rod 31 and the guide seam 23, preventing the sealing film 2 from being pulled off by the heating rod 31 and ensuring it remains reliably on the cigarette end face.

[0103] After the heating rod 31 is completely pulled out, the spreading force acting on the periphery of the guide seam 23 disappears. The elastic strain energy stored in the protective layer 22 is released, driving the material on both sides of the guide seam 23 to rebound, causing the guide seam 23 to automatically return to a closed state. The closure of the guide seam 23 causes the sealing film 2 to re-seal the port of the tobacco section 13, effectively preventing carbonized tobacco fragments from falling off the end face and remaining in the heating chamber.

[0104] The heated cigarette provided in this application will be further described below with reference to specific embodiments.

[0105] Example 1

[0106] The cigarette body 1 is composed of a filter section 11, a hollow section 12, and a tobacco section 13 connected sequentially along the axial direction. The filter section 11 is 7 mm long and is made of cellulose acetate bundles. The hollow section 12 is 26 mm long and has a polylactic acid hollow tube structure, used for cooling the smoke. The tobacco section 13 is 12 mm long and is filled with tobacco specifically for heated cigarettes. The total length of the cigarette body 1 is 45 mm, the circumference is 22.6 mm, and the diameter is 7.2 mm.

[0107] The sealing film 2 is adhered to the end face of the tobacco segment 13. The sealing film 2 has a three-layer composite structure, including an adhesive layer 21, an intermediate layer 27, and a protective layer 22. The adhesive layer 21 is 25 μm thick, made of EVA material, and has a softening temperature of approximately 65°C. The intermediate layer 27 is 30 μm thick, made of polypropylene material, and loaded with menthol aroma compounds. The protective layer 22 is 25 μm thick, made of aluminized PET material, and has a melting point of 162°C. The total thickness of the sealing film 2 is 80 μm, and its diameter is 7.4 mm, slightly larger than the cigarette's diameter of 7.2 mm.

[0108] The sealing film 2 has a guide seam 23 in the center. The guide seam 23 includes two perpendicularly intersecting cuts 231. The length of the cuts 231 is 2.8 mm (approximately 1 / 2.6 of the diameter of the sealing film 2). The buffer seam 24 is located at the intersection of the cross, forming a 45° angle with the cuts 231, and has a length of 0.4 mm (approximately 1 / 7 of the length of the cuts 231).

[0109] The adhesive layer 21 fuses with the tobacco end face material during the heating and activation process to ensure a strong bond.

[0110] Example 2

[0111] The difference between this embodiment and Embodiment 1 is that the sealing film 2 is a double-layer composite film structure, consisting only of an adhesive layer 21 and a protective layer 22, without an intermediate layer 27. The adhesive layer 21 has a thickness of 30 μm, is composed of ternary copolymer polypropylene, and has a softening temperature of 105°C. The protective layer 22 has a thickness of 25 μm, is composed of homopolymer polypropylene, and has a melting point of 165°C. The total thickness of the sealing film 2 is 55 μm.

[0112] The length of the cut 231 is 2.5 mm, and the length of the buffer seam 24 is 0.3 mm.

[0113] Example 3

[0114] The difference between this embodiment and Embodiment 1 is that sodium benzoate, an antibacterial agent conforming to the list of permitted tobacco additives, is uniformly dispersed in the adhesive layer 21 at an addition amount of 0.3 wt%. The intermediate layer 27 is loaded with tobacco puree, using porous starch as a slow-release carrier. The total thickness of the sealing film 2 is 90 μm.

[0115] Example 4

[0116] The difference between this embodiment and embodiment 1 is that, in addition to the cross-shaped cut 231, the guide seam 23 of the sealing film 2 also has two symmetrically arranged central anti-tear seams 25 and two end anti-tear seams 26 on each cut 231, forming a more complex anti-tear seam structure.

[0117] The performance of the heated cigarettes prepared in Examples 1-4 of this application was tested, and the results are shown in Table 1 below.

[0118] Table 1

[0119]

[0120] The bonding strength was tested according to the QB / T 2358 standard; the insertion tear resistance was tested using a 3mm diameter stainless steel rod to simulate a central heating rod; and the pull-out recovery rate refers to the percentage of the closed length of the cross-shaped seam after pull-out to the original seam length.

[0121] Test results show that all embodiments of this application can achieve a firm bond between the sealing film and the end face of the cigarette. The pre-cut structure effectively prevents tearing when the heating rod is inserted. After being pulled out, the film can recover well and maintain the sealing function of the tobacco end.

[0122] Example 5

[0123] The main body of the cigarette is composed of a filter section, a hollow section, and a tobacco section connected sequentially along the axial direction. The filter section is 7mm long and is made of cellulose acetate bundles; the hollow section is 26mm long and has a polylactic acid hollow tube structure, used for cooling the smoke; the tobacco section is 12mm long and is filled with tobacco specifically for heated cigarettes. The total length of the main body of the cigarette is 45mm, the circumference is 22.6mm, and the diameter is 7.2mm.

[0124] The sealing film has a three-layer composite structure. The adhesive layer is made of polyethylene (PE), 25 μm thick, with a Vicat softening point of 72℃; the middle layer is a PET matrix loaded with menthol (fragrance enhancer), 30 μm thick; the protective layer is made of polyethylene terephthalate (PET), 25 μm thick, with a 0.5 μm thick silicone oil anti-stick coating on its outer surface. The total thickness of the sealing film is 80 μm, it is circular, and has a diameter of 7.4 mm. A guide seam with a length of 2.8 mm and a buffer seam with a length of 0.4 mm are located in the center of the sealing film.

[0125] The sealing film is placed on the end face of the tobacco shreds, with the adhesive layer facing the cigarette paper. An ultrasonic welding device with a frequency of 20kHz, an amplitude of 25μm, a welding pressure of 0.2MPa, and a welding time of 0.3 seconds is used to fuse the sealing film and the cigarette paper together, forming a circumferentially continuous fused bond layer.

[0126] After welding, the welding interface between the sealing film and the end face of the tobacco section was characterized: the thickness of the fusion bonding layer was 12 μm; the diffusion depth of the sealing film material was 6 μm; the embedding depth of the cigarette paper fiber was 5 μm; the welding strength was 3.1 N / 15 mm (peel test, referring to QB / T 2358); the depth of the heat-affected zone was 1.0 mm; the change in moisture content of the tobacco in the heat-affected zone was -0.2%.

[0127] Performance tests are shown in Table 2 below.

[0128] Table 2

[0129]

[0130] Example 6

[0131] The difference between this embodiment and embodiment 5 is as follows:

[0132] The sealing film is antibacterial. The adhesive layer is made of polypropylene (PP), 30 μm thick, with a Vicat softening point of 95℃; the intermediate layer is PET matrix loaded with sodium benzoate (antibacterial), 35 μm thick, with sodium benzoate loaded in porous starch at an addition rate of 0.4 wt%; the protective layer is PET, 25 μm thick, for a total thickness of 90 μm. The sealing film diameter is 7.4 mm.

[0133] Performance testing: Welding strength 2.9N / 15mm, 14-day anti-mildew effect (28℃ / 85%RH) with no mold growth, and the diameter of the antibacterial ring is 8.2mm.

[0134] Example 7

[0135] The difference between this embodiment and embodiment 5 is as follows:

[0136] The sealing film is moisture-proof. The adhesive layer is EVA (VA content 22%), with a thickness of 20μm; the intermediate layer is PET matrix loaded with paraffin (moisture-proof), with a thickness of 25μm, the paraffin is loaded in mesoporous silica, and the addition amount is 8%; the protective layer is PET, with a thickness of 25μm, and the total thickness is 70μm.

[0137] Performance tests: Welding strength 2.7N / 15mm, water vapor transmission rate (38℃ / 90%RH) 0.9g / m²·24h, and tobacco moisture content increased by 1.2% after 14 days (compared to 7.5% in the control group).

[0138] Example 8

[0139] The difference between this embodiment and embodiment 5 is as follows:

[0140] The sealing film is biodegradable. The adhesive layer is PLA with a thickness of 25 μm; the intermediate layer is PLA matrix loaded with tobacco puree (flavor enhancer) with a thickness of 30 μm; the protective layer is PLA / PBAT blend (70:30) with a thickness of 25 μm, and the total thickness is 80 μm.

[0141] Performance tests: Welding strength 2.6N / 15mm, 96% compost degradation rate after 180 days, and 38% aroma retention rate after 30 days.

[0142] Example 9

[0143] The difference between this embodiment and embodiment 5 is as follows:

[0144] The sealing film does not have a guide seam structure in the center, making it suitable for peripherally heated smoking appliances. Other structures are the same as in Example 5.

[0145] Product performance comparisons are shown in Table 3.

[0146] Table 3

[0147]

[0148] Example 10

[0149] The main body of the cigarette is composed of a filter section, a hollow section, and a tobacco section connected sequentially along the axial direction. The filter section is 7mm long and is made of cellulose acetate bundles; the hollow section is 26mm long and has a polylactic acid hollow tube structure, used for cooling the smoke; the tobacco section is 12mm long and is filled with tobacco specifically for heated cigarettes. The total length of the main body of the cigarette is 45mm, the circumference is 22.6mm, and the diameter is 7.2mm.

[0150] The sealing film has a double-layer composite structure. The adhesive layer consists of ethylene-vinyl acetate copolymer (EVA) and carbon black (0.3 parts / 100 parts resin), with a thickness of 25 μm and an absorption rate of approximately 85% at 980 nm. The protective layer is polyethylene terephthalate (PET), with a thickness of 25 μm and a transmittance of approximately 85% at 980 nm. The total thickness of the sealing film is 50 μm, it is circular, and has a diameter of 7.4 mm. A guide seam with a length of 2.8 mm and a buffer seam with a length of 0.4 mm are provided in the center of the sealing film.

[0151] The sealing film is placed on the end face of the tobacco shreds, with the adhesive layer facing the cigarette paper. Laser transmission welding is performed using a semiconductor laser (wavelength 980nm, power 15W, welding speed 100mm / s, spot diameter 1.5mm) to fuse the sealing film and cigarette paper together, forming a circumferentially continuous fused bond layer.

[0152] After welding, the welding interface between the sealing film and the end face of the tobacco section was characterized: fusion bonding layer thickness: 12μm; sealing film material diffusion depth: 6μm; cigarette paper fiber embedding depth: 5μm; welding strength: 3.1N / 15mm (peel test, refer to QB / T2358); heat-affected zone depth: 0.3mm; change in tobacco moisture content in the heat-affected zone: -0.2%.

[0153] The performance test results are shown in Table 4.

[0154] Table 4

[0155]

[0156] Example 11

[0157] The difference between this embodiment and embodiment 10 is as follows:

[0158] The sealing film has a flavor-enhancing three-layer structure: an adhesive layer (EVA + carbon black, 20μm), an intermediate layer (PET + porous starch loaded with menthol, 20μm), and a protective layer (PET, 20μm), with a total thickness of 60μm.

[0159] Performance tests: Welding strength 2.9N / 15mm, aroma retention rate 40% after 30 days, cigarette end face temperature 50℃.

[0160] Example 12

[0161] The difference between this embodiment and embodiment 10 is as follows:

[0162] The sealing film is antibacterial: adhesive layer (PP + carbon black, 25μm), protective layer (PET, 25μm), with sodium benzoate added to the adhesive layer at 0.3wt%.

[0163] Performance testing: Welding strength 2.8N / 15mm, 14-day anti-mildew effect (28℃ / 85%RH) with no mold growth.

[0164] Example 13

[0165] The difference between this embodiment and embodiment 10 is as follows:

[0166] The sealing film does not have a guide seam structure in the center, making it suitable for peripherally heated smoking appliances. Other structures are the same as in Example 10.

[0167] Product performance comparisons are shown in Table 5.

[0168] Table 5

[0169]

[0170] The embodiments of this application have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of this application. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this application is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this application, and all such substitutions and modifications should fall within the scope of this application.

Claims

1. A heated cigarette stick, characterized in that, include: The main body of the cigarette; A sealing film, disposed at the insertion end of the cigarette body, and comprising: An adhesive layer is adhered to the end face of the insertion end; A protective layer is disposed on the outer layer of the adhesive layer; The sealing film forms a guide slit in the middle that penetrates the adhesive layer and the protective layer. During the process of inserting the external heating rod into the cigarette body, the adhesive layer and the protective layer are stretched open along the guide slit under the action of the heating rod to form an insertion port, allowing the heating rod to pass through the insertion port and be inserted into the cigarette body. After the heating rod is pulled out, the guide slit closes again due to the elasticity of the protective layer to maintain the seal on the insertion end.

2. The heated cigarette stick according to claim 1, characterized in that, The sealing film is circular, and its diameter is larger than the outer diameter of the cigarette body. The portion of the sealing film extending beyond the insertion end is adhered to the outer wall of the cigarette body.

3. The heated cigarette stick according to claim 2, characterized in that, The guide seam includes: At least two intersecting cuts extend radially outward through the axis of the cigarette body.

4. The heated cigarette stick according to claim 3, characterized in that, The guide seam includes two incisions, the two incisions extending in orthogonal directions.

5. The heated cigarette stick according to claim 3, characterized in that, The maximum opening size of the slit in its natural state is smaller than the outer diameter of the heating rod, so that when the heating rod is inserted, the guide slit is forced to expand elastically, and after the heating rod is pulled out, the sealing film relies on the elastic deformation of the material around the guide slit when it is stretched to close the guide slit, so as to maintain the seal on the insertion end.

6. The heated cigarette stick according to claim 5, characterized in that, The length of the cut is configured to be 1 / 3 to 1 / 2 of the outer diameter of the cigarette body.

7. The heated cigarette stick according to claim 3, characterized in that, The sealing film also has the following characteristics: A buffer seam extends radially outward at an angle to the cut, passing through the axis.

8. The heated cigarette stick according to claim 7, characterized in that, The length of the buffer seam is 1 / 10 to 1 / 5 of the length of the cut.

9. The heated cigarette stick according to claim 1, characterized in that, The sealing film also includes: An intermediate layer is disposed between the adhesive layer and the protective layer, and the guide seam extends from the protective layer through the intermediate layer and the adhesive layer. The intermediate layer is loaded with menthol aroma substances or tobacco essential oil.

10. The heated cigarette stick according to claim 1, characterized in that, The cigarette body includes: A filter segment, a hollow segment, and a tobacco segment are arranged sequentially along the axial direction, and the adhesive layer is adhered to the end face of the tobacco segment opposite to the hollow segment.

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