Passive self-heating cigarette
Self-heating cigarettes solve the problems of high cost, complex structure and uneven heat release of electronically heated cigarettes by blocking and separating the reaction of oxidants and reducing agents and combining a gradient layered structure, thus achieving convenient and controllable heating effect and stable aerosol release.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA TOBACCO JIANGSU INDAL
- Filing Date
- 2026-04-02
- Publication Date
- 2026-05-12
AI Technical Summary
Existing electronically heated cigarettes suffer from problems such as high cost, complex structure, electrical safety risks, electronic waste pollution after disposal, uncontrollable start-up, uneven heat release, and unsatisfactory temperature curves.
It adopts a self-heating cigarette design without external heating. By introducing a barrier separation structure for oxidants, reducing agents and reaction transfer agents, it can be ignited by a conventional fire source. Combined with a gradient layered cigarette core structure, it realizes a controllable chain reaction of self-heating materials, ensuring uniform heat release and a stable temperature field.
It achieves convenient use without batteries or circuits, with controllable temperature field, uniform heat release, and stable aerosol release, reducing costs and improving user experience.
Smart Images
Figure SMS_1 
Figure SMS_4
Abstract
Description
Technical Field
[0001] This invention relates to the field of heated cigarette technology, and more specifically to a self-heating cigarette without external heating. Background Technology
[0002] Traditional heated tobacco products (HNB) generally rely on electronic components such as batteries, circuit boards, and heating elements, which present problems such as high cost, complex structure, electrical safety risks, and electronic waste pollution after disposal. To simplify the structure, some chemically self-heating cigarettes have also appeared in existing patents, which usually use heating materials that react with air or water (such as iron powder, quicklime, etc.).
[0003] CN107384331A discloses a self-heating material, method, and application for non-combustible cigarettes. The self-heating material is composed of calcium oxide and sodium bisulfate solution. This invention's self-heating material is small in size, and after the activation reaction, it generates heat without producing hydrogen gas. It is safe and stable during heat release, without combustion or explosion. The released heat can raise the temperature of the outer wall of the copper tube to above 150°C, and this temperature can be maintained above 150°C for more than 5 minutes, showing great promise for application in non-combustible cigarettes.
[0004] CN104957767A discloses a self-heating material for non-combustible cigarettes, which is composed of the following components in the indicated weight ratios: iron powder: 25-65%; adsorbent: 3-20%; inorganic salt: 1-10%; activated carbon: 3-20%; water-absorbing resin: 1-10%; water: 2-25%. This invention also discloses the application of the self-heating material in non-combustible cigarettes and a non-combustible cigarette incorporating the self-heating material within the tobacco.
[0005] However, these solutions generally suffer from the following drawbacks: (1) Uncontrollable or dependent on special structures: often requires additional operations such as plugging and unplugging, breaking the capsule to start the reaction, resulting in a poor user experience.
[0006] (2) Uneven heat release and unsatisfactory temperature curve: The heating material is mixed with tobacco or simply filled, resulting in a large axial or radial temperature gradient, overheating at the front end and insufficient heat at the back end, causing uneven release of smoke or local scorching.
[0007] (3) It is difficult to coordinate the reaction rate and duration: fast-start materials often release heat intensely but briefly, while long-lasting heat-releasing materials start slowly, making it difficult to achieve the ideal thermal curve of "fast start-stable maintenance" in a single volume.
[0008] Therefore, the market urgently needs a self-heating cigarette technology that is simple in structure, easy to start, and can provide a uniform, stable, and controllable heating temperature field. Summary of the Invention
[0009] To address the shortcomings of existing technologies, this invention provides a self-heating cigarette without external heating. This self-heating cigarette completely eliminates batteries and circuits, requiring only a brief ignition with a conventional flame source to trigger. Furthermore, by introducing a "reaction transfer agent" composed of hygroscopic / water-retaining materials, precise control over the chain reaction rate of the self-heating material is achieved. Simultaneously, relying on an innovative gradient-layered cigarette core structure, a self-heating cigarette with controllable chain reaction of the self-heating material, uniform heat release, and a stable temperature field is achieved.
[0010] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a self-heating cigarette without a source, wherein the self-heating cigarette without a source includes, from the distal end to the proximal end, a core section, a cooling section and a filter section in sequence. The core section, cooling section and filter section are formed by splicing together with splicing paper; The material of the core segment includes a mixture of self-heating material and tobacco substrate; The self-heating material includes an oxidant, a reducing agent, and a reaction transfer agent; The oxidant, reducing agent, and reaction transfer agent are physically separated from each other by barrier materials; The oxidant includes nitrates and / or permanganates; The reducing agent includes iron powder and / or aluminum powder.
[0011] The starting component of the heated cigarette of the present invention comprises an oxidant, a reducing agent, and a reaction transfer agent stored in isolation from each other. Initially, the components are physically separated by barrier materials. In use, the consumer uses an external flame source to heat the distal end of the cigarette core segment (approximately 3-5 seconds), causing a rapid increase in the local temperature at that end. The high temperature causes the barrier material (carbonizable polymer film / low-melting-point alloy foil) in that area to melt or carbonize and break down, allowing the previously physically isolated oxidant and reducing agent to come into contact, thereby initiating an initial exothermic reaction. The heat released by the reaction further heats the reaction transfer agent in adjacent areas, which regulates and maintains the stable propagation of the chain reaction through mechanisms such as hygroscopic / water-retaining / electrolyte absorption, ultimately allowing the exothermic reaction within the cigarette core material to propagate along a predetermined path throughout the entire cigarette core segment.
[0012] Preferably, the self-heating material is distributed in the tobacco substrate in any one of the following ways: axial activity gradient distribution, axial concentration gradient distribution, or radial stratification distribution.
[0013] Preferably, the mass ratio of the self-heating material to the tobacco substrate is 1:(3-6), for example, it can be 1:3.2, 1:3.5, 1:3.8, 1:4, 1:4.2, 1:4.5, 1:4.8, 1:5, 1:5.2, 1:5.5 or 1:5.8, etc.
[0014] Preferably, the axial activity gradient distribution includes a gradient decrease in the activity of the reducing agent in the self-heating material from the distal end to the proximal end.
[0015] When the self-heating material is distributed in an axial gradient in the tobacco substrate, the self-heating materials at the distal end and proximal end of the tobacco core segment are different, wherein the activity of the self-heating material at the distal end is greater than that at the proximal end. For example, the reducing agent in the self-heating material is aluminum powder, iron powder, a mixture of aluminum powder and iron powder in sequence from the distal end to the proximal end; or the reducing agent in the self-heating material is a mixture of iron powder and aluminum powder and iron powder in sequence from the distal end to the proximal end; or the reducing agent in the self-heating material is aluminum powder and iron powder in sequence from the distal end to the proximal end.
[0016] Preferably, the axial concentration gradient distribution includes a gradient decrease in the amount of self-heating material added from the distal end to the proximal end.
[0017] When the self-heating material is distributed in an axial gradient in the tobacco substrate, the self-heating material at the distal end and the proximal end of the tobacco core segment is the same, wherein the amount of self-heating material added at the distal end is greater than the amount of self-heating material added at the proximal end. Finally, the amount of self-heating material added at the distal end is 1.5-3 times the amount of self-heating material added at the proximal end, for example, it can be 1.6 times, 1.8 times, 2 times, 2.2 times, 2.5 times or 2.8 times, etc.
[0018] Preferably, the core segment in the radially layered distribution is a double-layered concentric circle structure composed of an inner core layer and an outer layer, wherein the reducing agent activity of the self-heating material in the inner core layer is greater than that of the self-heating material in the outer layer.
[0019] Preferably, the diameter d of the concentric inner core layer and the diameter D of the entire cigarette core segment satisfy d / D≥2 / 3.
[0020] Preferably, the reducing agent of the self-heating material in the inner core layer is a mixture of iron powder and aluminum powder or aluminum powder.
[0021] Preferably, the reducing agent of the self-heating material in the outer layer is iron powder.
[0022] When the core segment described in this invention has a concentric layered structure, the inner core can ensure that heat is rapidly transferred from the starting point to the inside of the core and axially, while the outer layer can be used to slow down radial heat loss, making the heat more concentrated inside the core and achieving radially uniform heating.
[0023] Preferably, the mass ratio of the oxidant, reducing agent and reaction transfer agent is (0.5-1.5): (2-4): (0.1-1).
[0024] "0.5-1.5" can be 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3 or 1.4, etc. "2-4" can be 2.1, 2.3, 2.5, 2.8, 3, 3.2, 3.5, 3.7, or 3.9, etc.; "0.1-1" can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or 0.9, etc.
[0025] Preferably, the reaction transfer agent includes any one or a combination of at least two of the following: a hygroscopic material, a water-retaining material, an electrolyte, or an acidic substance.
[0026] Preferably, the moisture-absorbing material comprises calcium chloride.
[0027] Preferably, the water storage material includes activated carbon and / or diatomaceous earth.
[0028] Preferably, the electrolyte comprises magnesium sulfate.
[0029] Preferably, the acidic substance includes tartaric acid and / or citric acid.
[0030] Preferably, the core section is further wrapped with thermal insulation material between itself and the tipping paper.
[0031] Preferably, the thermal insulation material comprises silica aerogel particles.
[0032] Preferably, the mass ratio of the thermal insulation material to the tobacco substrate is 1:(20-40), for example, it can be 1:21, 1:23, 1:25, 1:28, 1:30, 1:32, 1:35, 1:37 or 1:39, etc.
[0033] Preferably, the barrier material comprises a carbonizable polymer film and / or a low-melting-point alloy foil.
[0034] Preferably, the cooling section has a hollow structure.
[0035] Preferably, the cooling section is a hollow paper tube.
[0036] Preferably, the filter tip is made of cellulose acetate or polylactic acid.
[0037] Preferably, the tobacco substrate includes tobacco raw materials, a smoking agent, an adhesive, and a tobacco flavoring. Preferably, the tobacco raw material includes any one or a combination of at least two of tobacco sheets, tobacco pellets, or shredded tobacco; Preferably, the tobacco flavoring comprises any one or a combination of at least two of vanillin, 2-acetylpyrazine, 2,3,5-trimethylpyrazine, isoamyl isovalerate, menthyl acetate, phenethyl alcohol, furanone, or geraniol; Preferably, the adhesive comprises any one or a combination of at least two of sodium carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, chitosan, guar gum, or cellulose acetate; Preferably, the smoke-generating agent comprises any one or a combination of at least two of propylene glycol, glycerin, or sorbitol.
[0038] All the specific point values within the above range can be selected, and will not be elaborated on here.
[0039] Compared with the prior art, the present invention has the following beneficial effects: (1) Complete de-electronic: No batteries, circuits, chips or any electronic components are required, which fundamentally solves the problems of battery life, charging, recycling and electronic failure, and significantly reduces costs.
[0040] (2) Extremely convenient to use: Consumers only need a lighter to use it. There is no need to buy, carry and maintain special smoking devices. The threshold for use is extremely low and the experience is close to that of traditional cigarettes.
[0041] (3) Optimized and controllable temperature field: The axial gradient effectively avoids the problem of "insufficient heating at the front end and overheating and burning at the rear end", making the aerosol release more uniform and stable. Radial stratification ensures that the tobacco core is heated synchronously and uniformly from the center to the periphery, improving the tobacco utilization rate and avoiding insufficient pyrolysis at the periphery.
[0042] (4) High controllability of reaction: By selecting materials, particle size, coating technology, layered structure and barrier layer design, the starting temperature, propagation speed and total heat release of the exothermic reaction can be precisely controlled, thereby matching the pyrolysis curve of different styles of tobacco substrates. Detailed Implementation
[0043] The following detailed description of the features and advantages of the present invention is sufficient to enable those skilled in the art to understand the technical content of the present invention and implement it accordingly. Furthermore, based on this specification and the claims, those skilled in the art can easily understand the related objectives and advantages of the present invention.
[0044] The terminology and expressions used herein are for descriptive purposes only, and the invention should not be limited to these terms and expressions. The use of these terms and expressions does not imply the exclusion of any illustrative and descriptive equivalents (or parts thereof), and it should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.
[0045] In the embodiments or comparative examples of the present invention, the diameter of the heated cigarette is 8.0 mm, the length of the core section is 20 cm, the length of the cooling section is 24 cm, and the length of the filter section is 20 cm.
[0046] Example 1 This embodiment provides a self-heating cigarette without external heating, which includes, from the far end to the near end, a core section, a cooling section (hollow paper tube) and a filter section (cellulose acetate). The core section, cooling section and filter section are formed by splicing together with splicing paper; The structure of the core segment is a mixture of self-heating material and tobacco substrate, and an insulating material covering the outer layer of the self-heating material and tobacco substrate mixture; The self-heating material is an oxidant, a reducing agent, and a reaction transfer agent in a mass ratio of 2:6:1; The oxidant, reducing agent and reaction transfer agent are physically separated by a barrier material; The tobacco substrate consists of 20 parts tobacco sheet, 4 parts smoke-generating agent (glycerin), 0.5 parts adhesive (sodium carboxymethyl cellulose), and 0.5 parts tobacco flavoring (vanillin). The smoke-generating agent, adhesive, and tobacco flavoring are evenly distributed inside the tobacco sheet. The self-heating material is distributed in the tobacco substrate with an axial activity gradient decreasing from the distal end to the proximal end. The tobacco core is divided into two sections. The reducing agent of the self-heating material in the distal end section is a mixture of iron powder and aluminum powder (mass ratio 1:1), and the reducing agent of the self-heating material in the proximal end section is iron powder. The mass ratio of the self-heating material to the tobacco substrate is 2:9. The oxidant is sodium nitrate from the distal end to the proximal end, and the reaction transfer agent is calcium chloride from the distal end to the proximal end. The mass ratio of the heat-insulating material (silica aerogel particles) to the tobacco substrate is 1:30. The barrier material is a carbonizable polymer film.
[0047] The self-heating cigarette preparation steps without external heating: (1) After the tobacco raw material is crushed, it is mixed evenly with the smoking agent, adhesive and tobacco flavoring to make tobacco base material granules; (2) Grind the oxidant, reducing agent and reaction transfer agent evenly, and then physically separate them through a barrier material to make a self-heating material; (3) Preparation of tobacco core segment: The self-heating material and tobacco substrate are mixed and molded according to the axial gradient to form the inner core of the tobacco core segment. The heat insulation material is prepared into a thin film to cover the inner core and form the tobacco core segment. (4) Arrange the core section, cooling section and filter section in sequence, and attach them with splicing paper to make a self-heating cigarette.
[0048] Example 2 This embodiment provides a self-heating cigarette without external heating, which includes, from the far end to the near end, a core section, a cooling section (hollow paper tube) and a filter section (cellulose acetate). The core section, cooling section and filter section are formed by splicing together with splicing paper; The structure of the core segment is a mixture of self-heating material and tobacco substrate, and an insulating material covering the outer layer of the self-heating material and tobacco substrate mixture; The self-heating material is an oxidant, a reducing agent, and a reaction transfer agent in a mass ratio of 3:4:0.3; The oxidant, reducing agent and reaction transfer agent are physically separated by a barrier material; The tobacco base material, by weight, consists of 22 parts tobacco shreds, 3.5 parts smoking agent (glycerin), 0.1 parts adhesive (chitosan), and 0.4 parts tobacco flavoring (2,3,5-trimethylpyrazine and isoamyl isovalerate in a 1:1 mass ratio). The self-heating material is distributed in the tobacco substrate with an axial concentration gradient decreasing from the distal end to the proximal end. The distal and proximal ends of the tobacco core section use the same self-heating material (iron powder as the reducing agent, potassium permanganate and sodium nitrate in a 1:1 mass ratio as the oxidizing agent, and magnesium sulfate and activated carbon in a 1:1 mass ratio as the reaction transfer agent). The final amount of self-heating material added at the distal end is twice that at the proximal end. The mass ratio of self-heating material to tobacco substrate is 1:4. The mass ratio of heat-insulating material (silica aerogel particles) to tobacco substrate is 1:40. The barrier material is a composite film of carbonizable polymer film and low-melting-point alloy foil.
[0049] The preparation method of the self-heating cigarette is described in Example 1.
[0050] Example 3 This embodiment provides a self-heating cigarette without external heating, which includes, from the far end to the near end, a core section, a cooling section (hollow paper tube) and a filter section (cellulose acetate). The core section, cooling section and filter section are formed by splicing together with splicing paper; The structure of the core segment is a mixture of self-heating material and tobacco substrate, and an insulating material covering the outer layer of the self-heating material and tobacco substrate mixture; The self-heating material is an oxidant, a reducing agent, and a reaction transfer agent in a mass ratio of 1:3:2; The oxidant, reducing agent and reaction transfer agent are physically separated by a barrier material; The tobacco base material, by weight, consists of 19 parts tobacco granules, 3.8 parts smoke-generating agent (glycerol and propylene glycol in a 1:1 mass ratio), 0.8 parts adhesive (guar gum), and 0.6 parts tobacco flavoring (menthol acetate). The self-heating material is radially layered within the tobacco substrate. The tobacco core segment has a concentric layered structure (the diameter of the inner core layer is 0.7 times the total diameter of the tobacco core segment). The inner core layer is a mixture of highly active self-heating material (a 1:1 mass ratio of iron powder and aluminum powder as the reducing agent, sodium nitrate as the oxidizing agent, and magnesium sulfate and activated carbon as the reaction transfer agent) and the tobacco substrate. The outer layer is a mixture of low-activity self-heating material (iron powder as the reducing agent, sodium nitrate as the oxidizing agent, and magnesium sulfate and activated carbon as the reaction transfer agent) and the tobacco substrate. The mass ratio of the self-heating material to the tobacco substrate is 2:9. The mass ratio of the heat-insulating material (silica aerogel particles) to the tobacco substrate is 1:20. The barrier material is a low-melting-point alloy foil.
[0051] The preparation method of the self-heating cigarette is described in Example 1.
[0052] Example 4 This embodiment provides a self-heating cigarette without external heating. The only difference between this embodiment and Embodiment 1 is that the self-heating material is uniformly distributed in the tobacco substrate (without gradient distribution). That is, the self-heating material has the same activity and the same amount added from the distal end to the proximal end (the reducing agent is iron powder, the oxidizing agent is sodium nitrate, and the reaction transfer agent is calcium chloride). The mass ratio of the self-heating material to the tobacco substrate is 2:9, and the mass ratio of the heat-insulating material (silica aerogel particles) to the tobacco substrate is 1:30. The remaining structure and composition are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.
[0053] Example 5 This embodiment provides a self-heating cigarette without external heating. The only difference between this embodiment and Embodiment 1 is that the self-heating material is uniformly distributed in the tobacco substrate (without gradient distribution). That is, the self-heating material has the same activity and the same amount added from the distal end to the proximal end (the reducing agent is a mixture of iron powder and aluminum powder in a mass ratio of 1:1, the oxidant is sodium nitrate, and the reaction transfer agent is calcium chloride). The mass ratio of the self-heating material to the tobacco substrate is 2:9, and the mass ratio of the heat-insulating material (silica aerogel) to the tobacco substrate is 1:30. The remaining structure and composition are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.
[0054] Example 6 This embodiment provides a self-heating cigarette without external heating. The only difference between this embodiment and Embodiment 1 is that the self-heating material in the tobacco substrate exhibits an axially increasing activity gradient from the distal end to the proximal end. The tobacco core is divided into two sections. In the self-heating material of the distal end section, the reducing agent is iron powder, and in the self-heating material of the proximal end section, the reducing agent is a mixture of iron powder and aluminum powder (mass ratio 1:1). The mass ratio of the self-heating material to the tobacco substrate is 2:9. The oxidant from the distal end to the proximal end is sodium nitrate, and the reaction transfer agent from the distal end to the proximal end is calcium chloride. The mass ratio of the heat-insulating material (silica aerogel particles) to the tobacco substrate is 1:30. The barrier material is a carbonizable polymer film. The remaining structure and composition are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.
[0055] Example 7 This embodiment provides a self-heating cigarette without external heating. The only difference between this embodiment and Embodiment 2 is that the self-heating material is distributed in the tobacco substrate with an axial concentration gradient from the distal end to the proximal end. The distal and proximal ends of the tobacco core section use the same self-heating material (the reducing agent is iron powder, the oxidizing agent is potassium permanganate and sodium nitrate in a mass ratio of 1:1, and the reaction transfer agent is magnesium sulfate and activated carbon in a mass ratio of 1:1). Finally, the amount of self-heating material added at the distal end is 0.5 times that at the proximal end. The mass ratio of the self-heating material to the tobacco substrate is 1:4. The mass ratio of the heat-insulating material (silica aerogel particles) to the tobacco substrate is 1:40. The barrier material is a composite film of a carbonizable polymer film and a low-melting-point alloy foil. The remaining structure and composition are the same as in Embodiment 2, and the preparation method is the same as in Embodiment 1.
[0056] Example 8 This embodiment provides a self-heating cigarette without external heating. The only difference between this embodiment and Embodiment 3 is that the self-heating material is radially layered. The core segment has a concentric layered structure (the diameter of the inner core layer is 0.7 times the total diameter of the core segment). The inner core layer is a mixture of highly active self-heating material (the reducing agent is a mixture of iron powder and aluminum powder in a 1:1 mass ratio, the oxidant is sodium nitrate, and the reaction transfer agent is magnesium sulfate and activated carbon) and tobacco substrate. The outer layer is tobacco substrate. The mass ratio of the self-heating material to the tobacco substrate is 2:9. The mass ratio of the heat-insulating material (silica aerogel particles) to the tobacco substrate is 1:30. The barrier material is a low-melting-point alloy foil. The remaining structure and composition are the same as in Embodiment 3, and the preparation method is the same as in Embodiment 1.
[0057] Example 9 This embodiment provides a self-heating cigarette without external heating. The only difference between this embodiment and Embodiment 1 is that the mass ratio of the self-heating material to the tobacco substrate is 1:1, and the total amount of the self-heating material and the tobacco substrate remains unchanged. The remaining structure and composition are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.
[0058] Example 10 This embodiment provides a self-heating cigarette without external heating. The only difference between this embodiment and Embodiment 1 is that the mass ratio of the self-heating material to the tobacco substrate is 1:9, and the total amount of the self-heating material and the tobacco substrate remains unchanged. The remaining structure and composition are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.
[0059] Comparative Example 1 This comparative example provides a heated cigarette, which includes, from the distal end to the proximal end, a core section, a cooling section (hollow paper tube), and a filter section (cellulose acetate). The core section, cooling section and filter section are formed by splicing together with splicing paper; The material of the core segment is tobacco substrate; The composition of the tobacco substrate is the same as that in Example 1.
[0060] Test case Test subjects: heated cigarettes of Examples 1-10 and Comparative Example 1, which were ignited at the distal end using a lighter.
[0061] Test items and standards: (1) Effective heating duration of the entire tobacco core segment: from the moment when the first temperature measuring point (2mm away from the far end of the tobacco core segment) first reaches (220-300)℃, to the moment when the last temperature measuring point (near end of the tobacco core segment) last drops below 220℃, the effective heating duration of the entire tobacco core segment should be (5-5.5)min; (2) Maximum temperature: Test the maximum temperature of the cigarette core section of the other inhalation ports except the ignition port. The maximum temperature should be (220-300)℃ to avoid local overheating or insufficient temperature.
[0062] (3) Aerosol release: During the heating process of cigarettes, the amount of aerosols (mg) captured by the Cambridge filter was tested after 5 minutes of smoking in the Canadian deep smoking mode (smoking capacity 55.0 mL, smoking time 2 s, smoking frequency 30 s, smoking curve is bell-shaped).
[0063] (4) Aerosol puff-by-puff stability index: The aerosol stability of heated cigarettes should be based on ensuring the total aerosol release, while comprehensively considering the overall dispersion of the data and the consistency of the data from adjacent puffs. Based on these two dimensions, the stability index of heated cigarettes is calculated to evaluate puff-by-puff stability. The relative standard deviation (RSD) method is selected to evaluate the overall dispersion of the puff-by-puff release data, and the relative moving average (RMR) method is selected to evaluate the consistency of the release from adjacent puffs. Therefore, the puff-by-puff stability of heated cigarette aerosols can be represented by a two-dimensional vector, specifically represented as: (RSD, RMR).
[0064] The better the overall dispersion of the release volume data from each pumping port (i.e., the smaller the RSD on the horizontal axis), the closer the vector is to the vertical axis. The smaller the difference in release volume data between adjacent pumping ports (i.e., the smaller the RMR on the vertical axis), the closer the vector is to the horizontal axis. When both RSD and RMR are very small, the vector is closer to the origin. The magnitude of the above two-dimensional vector is calculated and defined as the stability index SI. The smaller the stability index value, the better the stability. The calculation formula is as follows: in, Let i be the aerosol release amount at the i-th suction port sequence. is the arithmetic mean of the amount of aerosol ACM released from each port, and n is the total number of suction ports.
[0065] The test results are shown in Table 1.
[0066] Table 1 Test results show that, compared with the conventional heated cigarettes of Comparative Example 1, the self-heating cigarettes of Examples 1-3 of the present invention can control the continuous heating time to 5-5.5 min, the maximum temperature to (220-300) ℃, the smoke release to be higher, all of which meet the product design requirements, and the aerosol stability per puff is good.
[0067] As can be seen from Examples 4-10, the setting method and amount of self-heating material have a significant impact on the heating duration, peak temperature, aerosol release characteristics and aerosol stability of heated cigarettes, and need to be optimized within the scope defined by this invention.
[0068] The applicant declares that the technical solution of this invention is illustrated by the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the products of this invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.
[0069] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.
[0070] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.
Claims
1. A self-heating cigarette without external heating, characterized in that, The self-heating cigarette without external heating includes, from the distal end to the proximal end, a core section, a cooling section, and a filter section. The core section, cooling section and filter section are formed by splicing together splicing paper; The material of the core segment includes a mixture of self-heating material and tobacco substrate; The self-heating material includes an oxidant, a reducing agent, and a reaction transfer agent; The oxidant, reducing agent and reaction transfer agent are physically separated by a barrier material; The oxidant includes nitrates and / or permanganates; The reducing agent includes iron powder and / or aluminum powder.
2. The self-heating cigarette as described in claim 1, characterized in that, The distribution of the self-heating material in the tobacco substrate includes any one of axial activity gradient distribution, axial concentration gradient distribution, or radial stratification distribution. Preferably, the mass ratio of the self-heating material to the tobacco substrate is 1:(3-6).
3. The self-heating cigarette as described in claim 2, characterized in that, The axial activity gradient distribution includes a gradient decrease in the activity of the reducing agent in the self-heating material from the distal end to the proximal end.
4. The self-heating cigarette as described in claim 2, characterized in that, The axial concentration gradient distribution includes a gradient decrease in the amount of self-heating material added from the distal end to the proximal end.
5. The self-heating cigarette as described in claim 2, characterized in that, In the radially layered distribution, the core segment is a double-layered concentric circle structure composed of an inner core layer and an outer layer, wherein the reducing agent activity of the self-heating material in the inner core layer is greater than that of the self-heating material in the outer layer. Preferably, the diameter d of the concentric inner core layer and the diameter D of the entire cigarette core segment satisfy d / D≥2 / 3; Preferably, the reducing agent of the self-heating material in the inner core layer is a mixture of iron powder and aluminum powder or aluminum powder; Preferably, the reducing agent of the self-heating material in the outer layer is iron powder.
6. The self-heating cigarette without external heating as described in any one of claims 1-5, characterized in that, The mass ratio of the oxidant, reducing agent, and reaction transfer agent is (0.5-1.5): (2-4): (0.1-1). Preferably, the reaction transfer agent comprises any one or a combination of at least two of the following: a hygroscopic material, a water-retaining material, an electrolyte, or an acidic substance; Preferably, the moisture-absorbing material comprises calcium chloride; Preferably, the water storage material includes activated carbon and / or diatomaceous earth; Preferably, the electrolyte comprises magnesium sulfate; Preferably, the acidic substance includes tartaric acid and / or citric acid.
7. The self-heating cigarette without external heating as described in any one of claims 1-6, characterized in that, The core section is also wrapped with insulation material between itself and the tipping paper; Preferably, the thermal insulation material comprises silica aerogel particles; Preferably, the mass ratio of the thermal insulation material to the tobacco substrate is 1:(20-40).
8. The self-heating cigarette without external heating as described in any one of claims 1-7, characterized in that, The barrier material includes a carbonizable polymer film and / or a low-melting-point alloy foil.
9. The self-heating cigarette without external heating as described in any one of claims 1-8, characterized in that, The cooling section has a hollow structure; Preferably, the cooling section is a hollow paper tube; Preferably, the filter tip is made of cellulose acetate or polylactic acid.
10. The self-heating cigarette without external heating as described in any one of claims 1-9, characterized in that, The tobacco substrate includes tobacco raw materials, smoking agents, adhesives, and tobacco flavorings; Preferably, the tobacco raw material includes any one or a combination of at least two of tobacco sheets, tobacco pellets, or shredded tobacco; Preferably, the tobacco flavoring comprises any one or a combination of at least two of vanillin, 2-acetylpyrazine, 2,3,5-trimethylpyrazine, isoamyl isovalerate, menthyl acetate, phenethyl alcohol, furanone, or geraniol; Preferably, the adhesive comprises any one or a combination of at least two of sodium carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, chitosan, guar gum, or cellulose acetate; Preferably, the smoke-generating agent comprises any one or a combination of at least two of propylene glycol, glycerin, or sorbitol.