Combustion-type heated cigarettes

Abstract

This invention belongs to the field of tobacco technology and discloses a combustion-type heated cigarette. The combustion-type heated cigarette includes a filter section, a core section, a combustion material layer, a thermally conductive insulating layer, and a membrane-wrapped structure. The filter section and the core section are coaxially connected. The core section includes tobacco particles, sheets, or filaments loaded with nicotine and a smoke-generating agent. The combustion material layer wraps around the outer peripheral wall of the core section and is used to ignite and heat the core section from the outside in. A thermally conductive insulating layer is provided between the combustion material layer and the core section. An oxygen supply groove is provided on the side of the combustion material layer near the thermally conductive insulating layer. A membrane-wrapped structure is provided on the side of the combustion material layer near the filter section, and the membrane-wrapped structure is used to prevent gas generated by the combustion material layer from entering the filter section. This invention enables uniform heating of the tobacco material, reduces heat loss, improves the purity of the aerosol, and enhances the user experience.

Description

Technical Field

[0001] This invention relates to the field of tobacco technology, and more particularly to a combustion-type heated cigarette. Background Technology

[0002] Heated cigarettes, as an important branch of new tobacco products, aim to meet consumers' nicotine intake needs while reducing the release of harmful substances by heating tobacco materials instead of direct combustion. Based on the heating method, they are mainly divided into two categories: electrically heated and combustion-based (such as charcoal heated) types. Electrically heated products require a dedicated heating device, which consumers must carry and charge, limiting their use scenarios and resulting in higher equipment costs. In contrast, combustion-based heated cigarettes have significant advantages: no need for a device, convenient portability, immediate use, and closer to traditional cigarette consumption habits, making them irreplaceable in specific markets and scenarios.

[0003] Existing designs for combustion-type heated cigarettes, such as charcoal-heated cigarettes, typically employ a structure where the combustion section and the core section are arranged coaxially: the front end is an ignitable charcoal heat source, and the rear end is the core material loaded with nicotine and smoke-generating agents. Heat is transferred from the front end to the rear end through conduction or convection. However, this segmented structure suffers from technical drawbacks such as uneven heating, significant heat loss, and the mixing of smoke from the front end with aerosols generated at the rear end. Summary of the Invention

[0004] The purpose of this invention is to provide a combustion-type heated cigarette that, on the one hand, heats the tobacco material evenly, improves the utilization rate of the tobacco material and the consistency of aerosol release, and enhances the user experience; on the other hand, reduces heat loss and ensures the continuity and stability of combustion.

[0005] To achieve this objective, the present invention adopts the following technical solution: a combustion-type heated cigarette, comprising a filter segment, a core segment, a combustion material layer, a thermally conductive insulating layer, and a membrane-wrapped structure. The filter segment and the core segment are coaxially connected. The core segment comprises tobacco particles, flakes, or filaments loaded with nicotine and a smoke-generating agent. The combustion material layer is wrapped around the outer peripheral wall of the core segment. The combustion material layer is used to be ignited and heat the core segment from the outside in. The thermally conductive insulating layer is disposed between the combustion material layer and the core segment. An oxygen supply groove is disposed on the side of the combustion material layer near the thermally conductive insulating layer. An air gap channel is formed between the oxygen supply groove and the thermally conductive insulating layer to provide oxygen for the combustion of the combustion material layer. The membrane-wrapped structure is disposed on the side of the combustion material layer near the filter segment. The membrane-wrapped structure is used to prevent the gas generated by the combustion material layer from entering the filter segment.

[0006] As an alternative to combustion-type heated cigarettes, the combustion-type heated cigarettes further include: An end-sealing component with a vent hole is provided at the end of the core section away from the filter section, and the thermally conductive insulating layer is wrapped around the outer wall surface of the end-sealing component.

[0007] As an optional solution for combustion-type heated cigarettes, the end sealing member is inserted into or bonded to the cigarette core segment.

[0008] As an alternative to combustion-type heated cigarettes, the outer wall surface of the end-sealing component is provided with external threads, the inner wall surface of the heat-conducting isolation layer is provided with internal threads, and the end-sealing component is threadedly connected to the heat-conducting isolation layer.

[0009] As an optional solution for combustion-type heated cigarettes, the diameter of the vent hole is 0.3mm-1.5mm.

[0010] As an alternative to combustion-type heated cigarettes, the end-sealing component is made of ceramic fiber or non-plant fiber flame-retardant paper.

[0011] As an alternative to combustion-type heated cigarettes, the oxygen supply groove extends along a direction parallel to the axis of the cigarette core segment or extends in a circumferential ring shape.

[0012] As an alternative to combustion-type heated cigarettes, the oxygen supply grooves are arranged in a spiral shape or in a grid shape.

[0013] As an optional solution for combustion-type heated cigarettes, multiple oxygen supply grooves are provided, the groove depth of the oxygen supply groove is 0.5mm-1.5mm, and / or the groove width of the oxygen supply groove is 0.3mm-2mm.

[0014] As an alternative to combustion-type heated cigarettes, the thermally conductive insulating layer may be made of graphene film, carbon fiber film, or metal thermally conductive film.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The combustion-type heated cigarette provided by this invention has a filter section and a core section arranged coaxially. A combustion material layer wraps around the outer periphery of the core section, forming a core-shell structure. A thermally conductive insulating layer is provided between the combustion material layer and the core section. After being ignited, the combustion material layer continuously burns, generating heat. The thermally conductive insulating layer not only provides physical isolation, preventing the open flame of the combustion material layer from directly contacting the core section and preventing the core from being ignited, thus ensuring the product's heating-non-combustible characteristic, but also evenly conducts the heat generated by the combustion material layer to the outer surface of the core section, achieving uniform circumferential heating of the core. This encapsulated heating method improves the utilization rate of the tobacco material and the consistency of aerosol release, reducing heat loss. A closed membrane wrapping structure is provided on the side of the combustion material layer near the filter section, preventing the gases generated by the combustion of the combustion material layer from entering the filter section, reducing harmful components. An oxygen supply groove is provided on the side of the combustion material layer closest to the thermally conductive insulation layer. When the combustion material layer and the thermally conductive insulation layer are assembled, at least one air gap channel is formed between the oxygen supply groove and the thermally conductive insulation layer, providing the necessary oxygen supply for the continuous smoldering of the combustion material layer, which helps to ensure the continuity and stability of combustion of the combustion material layer. Because the combustion material layer is separated from the smoke core section by the thermally conductive insulation layer, the purity of the aerosol entering the filter section is improved, thus improving the user experience. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the assembly of a combustion-type heated cigarette in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure in an embodiment of the invention where the combustion material layer is further provided with an oxygen supply chamber.

[0018] Figure label: 1. Filter section; 2. Core section; 3. Combustion material layer; 31. Oxygen supply groove; 32. Oxygen supply chamber; 4. Thermal insulation layer; 5. Membrane wrapping structure; 6. End sealing component; 61. Vent hole. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] Based on the heating method, heated cigarettes can be mainly divided into two categories: electrically heated and combustion-type (such as charcoal heated cigarettes). Electrically heated cigarettes require a special heating device, which consumers must carry with them and ensure the device has sufficient power, meaning they need to be recharged regularly. However, the need to carry the device significantly limits the usage scenarios, such as in situations where it's inconvenient to carry other items or if the device is forgotten. In stark contrast, combustion-type heated cigarettes do not require a special device; consumers simply light them like traditional cigarettes. This makes them extremely convenient to carry, allowing consumers to use them anytime, anywhere, truly achieving a convenient, "ready to use" experience.

[0024] However, existing combustion-type heated cigarettes (such as charcoal-heated cigarettes) are designed with the combustion section and the filler section coaxially arranged. In this structure, the front end is the ignitable charcoal heat source, which serves as the heating source, providing heat for the entire smoking process; the rear end is the filler material loaded with nicotine and smoke-generating agents. When heated by the heat transferred from the front end, the nicotine and smoke-generating agents in the filler material volatilize, forming an aerosol. Heat is transferred from the front end to the rear end in this process, thus heating the tobacco material. This results in uneven heating, with some areas of the tobacco material not being fully heated, affecting the taste and quality of the smoke. Moreover, there is significant heat loss during the heat transfer process, which not only reduces energy efficiency but also greatly diminishes the heating effect, failing to achieve the ideal smoking experience.

[0025] To ensure uniform heating of tobacco materials, improve their utilization rate and the consistency of aerosol release, reduce heat loss, and guarantee the continuity and stability of combustion, this embodiment provides a combustion-type heated cigarette. The following is a combination of... Figures 1 to 2 The specific content of this embodiment will be described in detail.

[0026] like Figure 1As shown, the combustion-type heated cigarette provided in this embodiment includes a filter section 1, a core section 2, a combustion material layer 3, a thermally conductive insulating layer 4, and a membrane wrapping structure 5. The filter section 1 and the core section 2 are coaxially connected, allowing the airflow to maintain a smooth and stable path. The core section 2 includes tobacco particles, sheets, or filaments loaded with nicotine and a smoke-generating agent. The combustion material layer 3 is wrapped around the outer peripheral wall of the core section 2 and is used to be ignited to heat the core section 2 from the outside in. A thermally conductive insulating layer 4 is provided between the combustion material layer 3 and the core section 2. An oxygen supply groove 31 is provided on the side of the combustion material layer 3 near the thermally conductive insulating layer 4, forming an air gap channel between the oxygen supply groove 31 and the thermally conductive insulating layer 4 to provide oxygen for the combustion of the combustion material layer 3. A membrane wrapping structure 5 is provided on the side of the combustion material layer 3 near the filter section 1, and the membrane wrapping structure 5 is used to prevent the gas generated by the combustion material layer 3 from entering the filter section 1. By separating the combustion material layer 3 from the core section 2 through the thermally conductive insulating layer 4, the purity of the aerosol entering the filter section 1 is improved, thus enhancing the user experience. For example, the membrane-encapsulated structure 5 is formed by encapsulating activated carbon with polylactic acid, glass fiber, polyamide, or a composite material thereof.

[0027] The combustion-type heated cigarette provided in this embodiment has a filter section 1 and a core section 2 arranged coaxially. A combustion material layer 3 wraps around the outer periphery of the core section 2, forming a core-shell structure. This structure is similar to a highly efficient heating system. The combustion material layer 3 acts as a heat source, continuously burning and generating a large amount of heat after being ignited. A thermally conductive insulating layer 4 is provided between the combustion material layer 3 and the core section 2. The heat generated by the continuous combustion of the combustion material layer 3 is transferred through the thermally conductive insulating layer 4, uniformly conducting the heat generated by the combustion material layer 3 to the outer surface of the core section 2, achieving uniform circumferential heating of the core section 2 from the outside in. This uniform heating method improves the utilization rate of tobacco materials. In traditional heating methods, due to uneven heating, some tobacco materials may not be fully heated and utilized, resulting in waste. The design of this embodiment ensures that each part of the tobacco material releases nicotine and smoke-generating agents at a suitable temperature, fully utilizing the value of the tobacco materials. Secondly, uniform circumferential heating ensures the consistency of aerosol release. Regardless of the angle from which the consumer inhales, they can obtain an aerosol with consistent taste and flavor. Furthermore, uniform heating effectively reduces heat loss. Heat can be transferred to the core section 2, reducing loss during the transfer process and improving energy utilization efficiency, allowing the heat generated by the combustion material layer 3 to be utilized more fully. The isolation layer effectively prevents the open flame of the combustion material layer 3 from directly contacting the core section 2. In traditional cigarettes, direct combustion of tobacco with an open flame produces a large amount of harmful substances. This design in this embodiment completely avoids the core being ignited by an open flame, ensuring the product's heating-non-combustible characteristic and reducing the generation of harmful substances at the source. A closed membrane wrapping structure 5 is provided on the side of the combustion material layer 3 near the filter section 1, preventing the gases generated by the combustion of the combustion material layer 3 from entering the filter section 1, reducing harmful components. An oxygen supply groove 31 is provided on the side of the combustion material layer 3 near the thermally conductive isolation layer 4. When the combustion material layer 3 and the thermally conductive isolation layer 4 are assembled, at least one air gap channel is formed between the oxygen supply groove 31 and the thermally conductive isolation layer 4. During combustion, oxygen is a key factor in maintaining continuous combustion. This air gap channel provides the necessary oxygen supply for the continuous smoldering of the combustion material layer 3. With a sufficient oxygen supply, the combustion material layer 3 can burn more stably, avoiding interruption or incomplete combustion due to lack of oxygen. This not only helps to ensure the continuity and stability of combustion in the combustion material layer 3, but also makes the combustion process more complete, further reducing the formation of harmful substances and improving the overall quality of the product.

[0028] Furthermore, the combustion-type heated cigarette also includes an end-sealing component 6 with a ventilation hole 61. The end-sealing component 6 is located at the end of the core section 2 away from the filter section 1 (i.e., the combustion initiation end, the end away from the consumer's mouth), and a thermally conductive insulating layer 4 is wrapped around the outer wall of the end-sealing component 6. During the use of the combustion-type heated cigarette, the combustion material layer 3 needs to be ignited to generate heat to heat the core section 2. Without the protection of the end-sealing component 6, when the consumer uses a lighter to ignite the combustion material layer 3, the flame is very likely to directly enter the core section 2 from the end, causing the core section 2 to be directly ignited by an open flame. Once the core section 2 is burned by an open flame like a traditional cigarette, it will produce a large amount of harmful substances produced when traditional cigarettes burn, such as tar and carbon monoxide. This contradicts the original intention of combustion-type heated cigarettes to reduce the release of harmful substances and achieve heating without combustion. The presence of the end-sealing component 6 effectively prevents the flame from directly igniting the core section 2 from the end, ensuring that the combustion process heats the core section 2 only through the heat generated by the combustion material layer 3, minimizing the generation of harmful substances. When the consumer inhales, by adding vents 61 (one, two, or more) to the end-sealing component 6, external air can quickly enter the product through the core section 2, mix thoroughly with the aerosol, and form a smooth airflow, ensuring that the consumer can easily and comfortably complete the inhalation action. The thermally conductive insulating layer 4 not only wraps around the outer peripheral wall of the core section 2 but also extends to wrap around the outer wall of the end-sealing component 6. This prevents the open flame generated during the combustion of the combustion material layer 3 from being directly transferred to the outer wall of the end-sealing component 6.

[0029] Furthermore, the end-sealing component 6 is fixed together with the cigarette drive segment 2 by either insertion or bonding. When using the insertion method, the end-sealing component 6 has a specific shape and size insertion structure, with a matching slot provided at the corresponding position on the cigarette drive segment 2. This design allows the end-sealing component 6 to be accurately inserted into the cigarette drive segment 2, forming a stable connection through their tight fit. The advantage of insertion is its relatively simple operation, enabling rapid connection during production assembly and improving production efficiency. In the bonding process, an appropriate amount of adhesive is evenly applied to the contact surfaces of the end-sealing component 6 and the cigarette drive segment 2, and then the two are tightly bonded together. After a certain curing time, the adhesive forms a strong adhesive layer, firmly bonding the end-sealing component 6 and the cigarette drive segment 2 together. The bonding method provides a more uniform and tighter connection, further enhancing the connection stability of the product structure.

[0030] Furthermore, the outer wall surface of the end-sealing component 6 is provided with external threads, and the inner wall surface of the heat-conducting insulation layer 4 is provided with internal threads, allowing the end-sealing component 6 to be threadedly connected to the heat-conducting insulation layer 4. On one hand, the threaded connection allows for quick installation of the end-sealing component 6. During production, the operator simply aligns the end-sealing component 6 with the threaded hole of the heat-conducting insulation layer 4 and slowly screws it in, causing the external and internal threads to engage. As the screwing continues, the end-sealing component 6 gradually penetrates deeper into the heat-conducting insulation layer 4 until it reaches the appropriate installation position. This installation method eliminates the need for complex tools and cumbersome procedures, significantly improving production efficiency. On the other hand, screwing the end-sealing component 6 also allows for flexible adjustment of its distance from the tobacco core section 2. In actual use, the tobacco material in the tobacco core section 2 may become somewhat loose due to transportation, storage, or other factors. In this case, the operator can screw the end-sealing component 6 clockwise to move it towards the tobacco core section 2, gradually bringing it closer to it. During this process, the end-sealing component 6 applies pressure to the core section 2, compacting it. This compaction allows the tobacco material to be more tightly packed together, reducing gaps between tobacco particles and increasing the density of the tobacco material. When the combustion material layer 3 heats the core section 2, heat is transferred to the tobacco material more evenly and efficiently, ensuring more thorough heating and improving the utilization rate of the tobacco material. This ensures that each portion of tobacco releases the appropriate amount of nicotine and smoke-generating agents.

[0031] For example, the diameter of the vent 61 is 0.3mm-1.5mm. When a consumer uses a combustion-type heated cigarette, outside air needs to enter the product through these vents 61. If the diameter of the vent 61 is too small, the resistance to air entry will increase significantly. Insufficient air volume will prevent the aerosol from mixing adequately with the air, resulting in a feeling of poor airflow and high suction resistance when the consumer inhales, making it difficult to obtain a comfortable experience.

[0032] Furthermore, the end-sealing component 6 is made of ceramic fiber or non-plant fiber flame-retardant paper. Ceramic fiber has high-temperature resistance and good heat insulation properties. During the ignition of a combustion-type heated cigarette, the external fire source and the combustion of the combustion material layer 3 generate high temperatures. The end-sealing component 6 made of ceramic fiber can withstand this high-temperature environment without deformation or damage. Non-plant fiber flame-retardant paper includes glass fiber paper, carbon fiber paper, or SiBCN ceramic fiber paper, etc., which have a heat resistance temperature of over 500℃ and do not burn or melt when exposed to open flame.

[0033] Furthermore, in this embodiment, the extension direction of the oxygen supply groove 31 can be either along the axis parallel to the core section 2 or in a circumferential ring shape, both of which contribute to the complete combustion of the combustion material layer 3.

[0034] Furthermore, the oxygen supply grooves 31 are arranged in a spiral or grid pattern. The spiral or grid-like arrangement of the oxygen supply grooves 31 improves oxygen utilization, ensures more complete combustion, and reduces the generation of harmful substances.

[0035] Furthermore, multiple oxygen supply grooves 31 are provided, with a groove depth of 0.5mm-1.5mm and / or a groove opening width of 0.3mm-2mm.

[0036] Furthermore, the thermally conductive insulating layer 4 is made of materials including graphene film, carbon fiber film, or metal thermally conductive film. Graphene film has extremely high thermal conductivity, enabling it to quickly and efficiently transfer the heat generated by the combustion material layer 3 to the core section 2. In addition, carbon fiber film has advantages such as light weight and corrosion resistance. Metal thermally conductive films, including aluminum film and copper film, have good thermal conductivity, enabling them to quickly transfer heat to the core section 2, and can be flexibly processed and bonded according to the shape of the product.

[0037] Optionally, such as Figure 2 As shown, an oxygen supply chamber 32 is provided inside the combustion material layer 3 to further increase the oxygen content inside the combustion material layer 3 and assist in the complete combustion of the combustion material layer 3.

[0038] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A combustion-type heated cigarette, characterized in that, The device includes a filter section (1), a core section (2), a combustion material layer (3), a thermally conductive insulating layer (4), and a membrane-wrapped structure (5). The filter section (1) is coaxially connected to the core section (2). The core section (2) includes tobacco particles, sheets, or filaments loaded with nicotine and a smoke-generating agent. The combustion material layer (3) is wrapped around the outer peripheral wall of the core section (2). The combustion material layer (3) is used to be ignited and heat the core section (2) from the outside in. The combustion material layer (3) is separated from the core section (2). The thermally conductive isolation layer (4) is provided, and an oxygen supply groove (31) is provided on the side of the combustion material layer (3) near the thermally conductive isolation layer (4). An air gap channel is formed between the oxygen supply groove (31) and the thermally conductive isolation layer (4) to provide oxygen for the combustion of the combustion material layer (3). The membrane wrapping structure (5) is provided on the side of the combustion material layer (3) near the filter section (1). The membrane wrapping structure (5) is used to block the gas generated by the combustion material layer (3) from entering the filter section (1).

2. The combustion-type heated cigarette according to claim 1, characterized in that, The combustion-type heated cigarette also includes: An end-sealing member (6) having a vent (61) is provided at one end of the core section (2) away from the filter section (1), and the thermally conductive insulating layer (4) is wrapped around the outer wall surface of the end-sealing member (6).

3. The combustion-type heated cigarette according to claim 2, characterized in that, The end sealing component (6) is inserted into or bonded to the core section (2).

4. The combustion-type heated cigarette according to claim 2, characterized in that, The outer wall surface of the end sealing member (6) is provided with external threads, and the inner wall surface of the thermally conductive isolation layer (4) is provided with internal threads. The end sealing member (6) is threadedly connected to the thermally conductive isolation layer (4).

5. The combustion-type heated cigarette according to claim 2, characterized in that, The diameter of the vent (61) is 0.3mm-1.5mm.

6. The combustion-type heated cigarette according to any one of claims 2-5, characterized in that, The end-sealing component (6) is made of ceramic fiber or non-plant fiber flame-retardant paper.

7. The combustion-type heated cigarette according to claim 1, characterized in that, The oxygen supply groove (31) extends along the axis parallel to the core section (2) or the oxygen supply groove (31) extends in a circumferential ring.

8. The combustion-type heated cigarette according to claim 1, characterized in that, The oxygen supply grooves (31) are arranged in a spiral shape or in a grid shape.

9. The combustion-type heated cigarette according to claim 1, characterized in that, Multiple oxygen supply grooves (31) are provided, the groove depth of the oxygen supply groove (31) is 0.5mm-1.5mm, and / or the groove width of the oxygen supply groove (31) is 0.3mm-2mm.

10. The combustion-type heated cigarette according to any one of claims 7-9, characterized in that, The thermally conductive insulating layer (4) is made of graphene film, carbon fiber film or metal thermally conductive film.

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