A hermetically sealed heated cigarette with controllable draw resistance

Abstract

The present invention belongs to the field of heat-not-burn cigarettes, and particularly relates to a hermetically heated cigarette rod with controllable draw resistance. The cigarette rod includes, from upstream to downstream, a tobacco section (1) with a sealed upstream end, a controllable draw resistance section (2), and a functional filter section (3) that are coaxially abutted in sequence. The cigarette rod is wrapped with an outer wrapper (4); wherein, the controllable draw resistance section (2) is a tube body having an axial central cavity (2-1) and circumferential sidewall through holes (2-2); the controllable draw resistance section (2) further includes a restricting and guiding element (2-3) disposed in the central cavity (2-1) and having an axial channel. The cigarette rod of the present invention is provided with a barrier layer covering the circumferential sidewall and the sidewall through holes of the central cavity in the controllable draw resistance section, which has a certain air permeability. During suction, it does not affect the inflow of external air; when not sucking, the smoke will not escape through the sidewall through holes either. Therefore, the loss of smoke can be effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the field of heat-not-burn cigarettes, and particularly relates to a hermetically heated cigarette rod with controllable draw resistance. Background Art

[0002] Traditional tobacco has a history of hundreds of years and has been integrated into the lives of most smokers. In recent years, with the improvement of people's living standards, issues such as smoking and health, and the harm of second-hand smoke have attracted increasing attention, and the harmfulness of traditional tobacco products has become increasingly prominent. At the same time, with the implementation of the WHO Framework Convention on Tobacco Control, especially the gradual expansion of the scope of smoking bans in public places around the world, the development environment of tobacco products has undergone major and profound changes, and the structure of tobacco products is accelerating its adjustment towards diversification and smokelessness. New tobacco products have gradually become a realistic choice for major multinational tobacco companies to cope with the increasingly declining sales of traditional tobacco products.

[0003] At present, the vast majority of heat-not-burn cigarettes use air as the carrier of the smoke. In order to ensure that the tobacco does not burn, the applied heating temperature is usually relatively low, generally not exceeding 300 °C. Compared with traditional cigarettes, the tobacco flavor components of new heat-not-burn cigarettes are difficult to be completely released, and the amount of smoke is insufficient. Therefore, it is difficult for such cigarettes to be accepted by traditional smokers. In addition, in order to ensure air circulation, the tobacco ends of the vast majority of heat-not-burn cigarettes are of an open structure, that is, the tobacco shreds or reconstituted tobacco leaves are directly exposed, or are connected to the outside atmosphere through a certain air flow channel. During the process of pulling out the cartridge after smoking, tobacco residues may fall off, which is likely to pollute the smoking device. Therefore, this type of tobacco needs to spend time cleaning the smoking device after being used for a period of time. In addition, the measured mainstream smoke volume and draw resistance are also important factors affecting the cigarette consumption experience.

[0004] In order to solve the above problems, the present invention is proposed. Summary of the Invention

[0005] The present invention provides a hermetically heated cigarette rod with controllable draw resistance. The cigarette rod includes, from upstream to downstream, a tobacco section 1 with a sealed upstream end, a controllable draw resistance section 2, and a functional filter section 3 that are coaxially and sequentially abutted. The outside of the cigarette rod is wrapped with an outer wrapping member 4;

[0006] Among them, the controllable draw resistance section 2 is a tube body having an axial central cavity 2-1 and circumferential side wall through holes 2-2, and the number of the side wall through holes 2-2 is at least one; the controllable draw resistance section 2 further includes a restricted flow guiding element 2-3 provided in the central cavity 2-1 and having an axial channel.

[0007] The restricted flow guiding element 2-3 has an axial channel with a certain air permeability. Therefore, the axial flue gas diffusion resistance is low while the radial flue gas diffusion resistance is high. During suction, it does not affect the inflow of outside air; when not sucking, due to the high radial flue gas diffusion resistance, the flue gas will not escape through the side wall through holes 2-2, so the loss of flue gas can be effectively reduced.

[0008] The draw resistance of the cigarette rod can be adjusted by changing the aperture and quantity of the circumferential side wall through holes 2-2 and the porosity and / or air permeability of the restricted flow guiding element 2-3.

[0009] Preferably, the sealing method at the upstream end of the sealed tobacco section 1 is as follows: the circumference and / or upstream end face of the sealed tobacco section 1 is wrapped by a paper-based or foil-based material with airtight or controllable air permeability to form a sealed system; or a plug 5 is coaxially abutted at the upstream end of the sealed tobacco section 1.

[0010] Preferably, a coaxial through hole 4-1 is provided at a position corresponding to the side wall through hole 2-2 on the outer wrapping member 4, and the aperture of the coaxial through hole 4-1 is not less than that of the side wall through hole 2-2.

[0011] Preferably, there is a hollow tubular support layer between the tube wall of the controllable draw resistance section 2 and the restricted flow guiding element 2-3, and the side wall through hole 2-2 penetrates through the support layer.

[0012] Preferably, the functional filter section 3 includes a temperature reduction section 3-1 and a filtering section 3-2.

[0013] Preferably, the tobacco section 1 includes cut tobacco, tobacco flakes, tobacco particles, tobacco formed bodies or tobacco-containing gels.

[0014] Preferably, the restricted flow guiding element 2-3 is a columnar body with a certain air permeability, and completely or partially fills the central cavity 2-1.

[0015] Preferably, the restricted flow guiding element 2-3 is made of a paper-based or cellulose acetate formed material.

[0016] Preferably, the side wall of the restricted flow guiding element 2-3 covers the side wall through hole 2-2.

[0017] Preferably, the restricted flow guiding element 2-3 has a number of axial channels inside, and the air permeability of the side wall of the external axial channel is less than that of the central axial channel. This can further prevent the flue gas from escaping through the side wall through hole 2-2 and reduce the loss of flue gas.

[0018] Preferably, the restricted flow guiding element 2-3 includes an outermost hollow columnar restricting layer and a number of internal hollow columnar guiding layers, and the air permeability of the restricting layer is less than that of the guiding layer.

[0019] On the premise of no contradiction, the above technical solutions can be freely combined.

[0020] The present invention has the following beneficial effects:

[0021] 1. The present invention designs a sealed cigarette with controllable draw resistance for the first time, which is used in combination with a heated smoking device. Since the fresh smoke formed has a displacement effect on the internal atmosphere of the cigarette, the oxygen content in the cigarette will decrease during the heating process. At this time, even if the heating temperature is increased, combustion will not occur. Therefore, the heating temperature can be increased to fully release the tobacco flavor components and increase the amount of smoke. In addition, the cigarette of the present invention is provided with a limiting and guiding element having an axial smoke diffusion channel in the controllable draw resistance section. The limiting and guiding element has a certain air permeability, low axial smoke diffusion resistance, and high radial smoke diffusion resistance. During suction, it does not affect the inflow of external air; when not sucking, due to the high radial smoke diffusion resistance, the smoke will not escape through the side wall through holes, so the smoke loss can be effectively reduced. The draw resistance of the cigarette can be adjusted by changing the aperture, number of the circumferential side wall through holes, and the porosity of the limiting and guiding element.

[0022] 2. One end of the tobacco section of the sealed cigarette in contact with the cigarette receiving cavity is closed, and the situation that tobacco residues fall and pollute the smoking device will not occur.

[0023] 3. The sealed cigarette of the present invention is designed with a controllable draw resistance section having an axial central cavity and circumferential side wall through holes. During the suction process, external air enters from the side wall through holes and mixes with the smoke generated by heating the tobacco section in the cavity to form a mainstream smoke for people to suck. At the same time, during the suction process, external air enters from the side wall through holes. The air flow rate in the controllable draw resistance section is relatively high and the pressure is relatively low, which has an extraction effect on the smoke of the tobacco section. In addition, the external air has a cooling effect on the smoke.

[0024] 4. In the preferred technical solution, the cigarette of the present invention seals the tobacco section with a plug. During the cigarette production process, the plug can be co-wound with the tobacco section, which is convenient for industrial production. If components such as a sealing film are used to seal the tobacco section alone, the cigarette production process needs to be changed, and the existing equipment needs to be greatly modified, which is not convenient for industrial production. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of a sealed heated cigarette with controllable draw resistance according to Embodiment 1 of the present invention.

[0026] List of Reference Numerals:

[0027] 1. Tobacco section, 2. Controllable draw resistance section, 2-1. Central cavity, 2-2. Side wall through holes, 2-3. Limiting and guiding element, 3. Functional filter section, 3-1. Cooling section, 3-2. Filtering section, 4. External wrapping, 4-1. Coaxial through hole, 5. Plug. Detailed implementation manners

[0028] The content of the present invention will be further described below through specific implementation manners.

[0029] Example 1

[0030] A hermetically sealed heated cigarette with controllable draw resistance, the cigarette includes, from upstream to downstream, a tobacco section 1 with a sealed upstream end, a controllable draw resistance section 2, and a functional filter section 3 that are coaxially and sequentially abutted. The outside of the cigarette is wrapped with an outer wrapper 4;

[0031] Among them, the controllable draw resistance section 2 is a tube body with an axial central cavity 2-1 and circumferential side wall through holes 2-2. The number of the side wall through holes 2-2 is 2, and the aperture is 1.5 mm; the controllable draw resistance section 2 further includes a restricted flow guiding element 2-3 arranged in the central cavity 2-1 and having a plurality of axial channels, and its porosity is 40%.

[0032] The restricted flow guiding element 2-3 is a paper-based material with a certain air permeability. The restricted flow guiding element 2-3 completely covers the circumferential side wall of the central cavity 2-1 and the side wall through holes 2-2, and completely fills the central cavity 2-1.

[0033] The sealing method of the upstream end of the sealed tobacco section 1 is: a plug 5 is coaxially abutted at the upstream end of the sealed tobacco section 1. The plug 5 is made of an airtight material and has a certain thermal stability, and will not undergo significant deformation at 400 °C.

[0034] Coaxial through holes 4-1 are provided at positions corresponding to the side wall through holes 2-2 on the outer wrapper 4, and the aperture of the coaxial through holes 4-1 is not less than the aperture of the side wall through holes 2-2.

[0035] There is a hollow tubular support layer between the tube wall of the controllable draw resistance section 2 and the restricted flow guiding element 2-3, and the side wall through holes 2-2 penetrate through the support layer.

[0036] The restricted flow guiding element 2-3 includes an outermost hollow columnar restriction layer and several internal hollow columnar flow guiding layers, and the air permeability of the restriction layer is less than that of the flow guiding layer.

[0037] The functional filter section 3 includes a temperature reduction section 3-1 and a filtering section 3-2.

[0038] The tobacco section 1 includes a tobacco-containing gel.

[0039] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A hermetically sealed heated cigarette with controllable draw resistance, characterized in that, The cigarette rod includes, from upstream to downstream, a tobacco section (1) with a sealed upstream end, a controllable draw resistance section (2), and a functional filter section (3) that are coaxially abutted in sequence. The cigarette rod is externally wrapped with an outer wrapper (4). Among them, the controllable draw resistance section (2) is a tube body having an axial central cavity (2-1) and circumferential side wall through holes (2-2), and the number of the side wall through holes (2-2) is at least one; the controllable draw resistance section (2) further includes a restricting flow guiding element (2-3) disposed in the central cavity (2-1) and having an axial channel. A coaxial through hole (4-1) is provided at a position corresponding to the side wall through hole (2-2) on the outer wrapper (4), and the aperture of the coaxial through hole (4-1) is not less than the aperture of the side wall through hole (2-2). There is a hollow tubular support layer between the tube wall of the controllable draw resistance section (2) and the restricting flow guiding element (2-3), and the side wall through hole (2-2) penetrates through the support layer. The restricting flow guiding element (2-3) is a columnar body with a certain air permeability, and completely or partially fills the central cavity (2-1). The side wall of the restricting flow guiding element (2-3) covers the side wall through hole (2-2). The restricting flow guiding element (2-3) has a plurality of axial channels inside, and the air permeability of the side wall of the external axial channel is less than that of the central axial channel. The restricting flow guiding element (2-3) includes an outermost hollow columnar restricting layer and a plurality of internal hollow columnar flow guiding layers, and the air permeability of the restricting layer is less than that of the flow guiding layer.

2. The cigarette rod according to claim 1, characterized in that, The sealing method for the upstream end of the sealed tobacco section (1) is as follows: the circumference and / or the upstream end face of the sealed tobacco section (1) are wrapped with a paper-based or foil-based material with non-air permeability or controllable air permeability to form a closed system; or a plug (5) is coaxially abutted at the upstream end of the sealed tobacco section (1).

3. The cigarette according to claim 1, characterized in that, The functional filter section (3) includes a temperature reduction section (3-1) and a filtering section (3-2).

4. The cigarette according to claim 1, characterized in that, The tobacco section (1) includes tobacco shreds, tobacco flakes, tobacco particles, tobacco formed bodies or tobacco-containing gels.

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