Carbon-heated cigarettes

Abstract

A carbon-heated cigarette comprises a carbon rod section 1, a tobacco section 2, a smoke extraction section 3, and a filter section 4, arranged in succession from upstream to downstream. The carbon-heated cigarette may further comprise composite paper and an outer wrapping section 7 wrapped around the composite paper, the tobacco section 2, the smoke extraction section 3, and the filter section 4. The composite paper is wrapped around a portion of the carbon rod section 1 and a portion of or the entire tobacco section 2. The smoke extraction section 3 has a side wall with an axially extending cavity 31 and at least one side wall through-hole 32 communicating with the cavity 31. The outer wrapping section 7 has a wrapping section through-hole 70 formed at a position corresponding to the side wall through-hole 32, allowing outside air to enter the smoke extraction section 3. By preventing air from passing through the tobacco section 2 of the carbon-heated cigarette when the cigarette is being smoked, the carbon-heated cigarette can reliably maintain the temperature of the tobacco material within a certain temperature range, ensuring the composition and concentration of mainstream smoke.

Description

[Technical Field]

[0001] The present invention relates to the field of cigarettes, and more particularly to carbon heated cigarettes that heat tobacco by thermal conduction and produce smoke by air flow extraction. [Background technology]

[0002] Compared with other new tobacco products, carbon-heated cigarettes are closest to traditional cigarettes in terms of product appearance, smoking method, and sensory experience, making them uniquely valuable and important. Conventional technologies utilize high-temperature airflow generated by the combustion of a heat source to heat tobacco material, "roasting" the nicotine, flavorings, and other substances contained in the tobacco material, resulting in mainstream smoke after condensation. The temperature of the high-temperature airflow generated during the smoking process of currently known carbon-heated cigarettes can reach 400°C to 600°C, with a residual oxygen concentration of 8% to 13%. Under these conditions, the tobacco material may still undergo an exothermic oxidation reaction, resulting in local temperatures of the tobacco material reaching 700°C to 900°C, posing potential risks. Meanwhile, the content of harmful substances in mainstream smoke is higher than that of electrically heated cigarettes, resulting in a lower smoking comfort for consumers.

[0003] Patent documents such as Patent Documents 1, 2, and 3 all disclose that the heat source is isolated from the smoking substrate or tobacco material, and the heat generated by combustion of the heat source is transferred to the smoking substrate or tobacco material through a heat-conducting element. However, because the heat transfer efficiency of the end and the heat-conducting element is much lower than that of forced convection heat transfer, the temperature of the smoking substrate or tobacco material drops significantly, which has a significant impact on smoke composition and sensory quality. In addition, when fresh air enters the cigarette during smoking, the temperature of the smoking substrate or tobacco material further drops, which affects the smoke volume and stability of mainstream smoke. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Patent No. 103564657 [Patent Document 2] Chinese Patent Application Publication No. 107148224 [Patent Document 3] Chinese Patent No. 105324047 Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a carbon-heated cigarette in which air does not pass through the tobacco portion when the cigarette is smoked, thereby maintaining the tobacco material within a certain temperature range and ensuring the composition and concentration of mainstream smoke.

[0006] The carbon-heated cigarette according to the present invention comprises a carbon rod section, a tobacco section, a smoke extraction section, and a filter section, which are arranged coaxially adjacent to one another in succession from the upstream side to the downstream side of the carbon-heated cigarette. The carbon-heated cigarette may further comprise composite paper wrapped around a portion of the carbon rod section adjacent to the tobacco section, a portion of the tobacco section adjacent to the carbon rod section, or the entire tobacco section. The smoke extraction section has a cavity that passes through it in the axial direction of the carbon-heated cigarette, and a side wall of the smoke extraction section has at least one side wall through-hole that communicates with the cavity. The carbon-heated cigarette further comprises an outer wrapping section wrapped around the composite paper, the tobacco section, the smoke extraction section, and the filter section, and the outer wrapping section has a wrapping section through-hole formed in the outer wrapping section at a position corresponding to the at least one side wall through-hole, allowing outside air to enter the smoke extraction section.

[0007] According to a first exemplary embodiment of the present invention, a thermally conductive barrier can be disposed between the carbon rod portion and the tobacco portion to separate the carbon rod portion from the tobacco portion, and the composite paper is a metal composite foil paper.

[0008] Alternatively, the thermally conductive barrier can be fixed to the downstream end face of the carbon rod portion.

[0009] Preferably, the thermally conductive barrier may be made of an air-impermeable, thermally conductive material.

[0010] According to a second exemplary embodiment of the present invention, the composite paper may be a graphite composite paper, which includes an inner graphite paper layer and an outer cigarette paper layer, and the width of the inner graphite paper layer is smaller than the width of the outer cigarette paper layer.

[0011] Alternatively, the thickness of the graphite composite paper can be between 30 μm and 80 μm.

[0012] Preferably, the thermal conductivity of the inner graphite paper layer in the paper plane direction can be greater than 400 W / m·K, and the thermal conductivity of the inner graphite paper layer in the thickness direction can be less than 10 W / m·K.

[0013] The outer wrapping section may also include outer cigarette paper and receiver paper, with the outer cigarette paper wrapped around the outside of the composite paper, tobacco section, and smoke extraction section, and the receiver paper wrapped around the filter section and a portion of the outer cigarette paper that is outside the smoke extraction section.

[0014] According to one example, the cross section of the cavity of the smoke extraction section may have a regular or irregular shape.

[0015] According to another example, the cavity may be a cavity formed by a number of portions having different diameters.

[0016] According to yet another example, the cavity may be formed by a plurality of channels that are uniformly distributed and penetrate the carbon heated cigarette along its axial direction.

[0017] Preferably, the diameter of the winding portion through-hole is equal to or greater than the diameter of the side wall through-hole.

[0018] Alternatively, the outer wrap can be made from a paper-based or foil-based material that is air impermeable or has controlled air permeability.

[0019] Preferably, the smoke extraction section may be made of acetate, corrugated cardboard, or a paper-based material.

[0020] According to the carbon-heated cigarette of the present invention, the smoke extraction section has a cavity communicating with the outside through the sidewall perforations. Therefore, during smoking, air can enter the cigarette through the sidewall perforations of the smoke extraction section instead of passing through the tobacco section. Fresh air enters through the sidewall perforations, providing a good cooling effect on the mainstream smoke, thereby maintaining the tobacco material within a certain temperature range, thereby ensuring the composition and concentration of the mainstream smoke and improving the effective utilization rate of raw materials. Furthermore, the method of indirectly transporting smoke gases using the smoke extraction section effectively prevents cold air from passing through the tobacco section during smoking (puffing), improving heating efficiency and effectively reducing the oxygen content of the tobacco section, thereby achieving the goal of heating without combustion. Furthermore, by adjusting the number, diameter, orientation, and distance of the sidewall perforations from the tobacco section, the smoke extraction efficiency, smoke dilution efficiency, and mainstream smoke temperature can be easily adjusted, thereby improving the sensory quality of the cigarette. Furthermore, since the combustion smoke of the heat source is essentially separated from the mainstream smoke, the application range of heat source formulations can be expanded. The carbon heated cigarette according to the present invention has a simple structure and is therefore easy to produce industrially.

[0021] The above and other aspects and features of the present invention will become apparent from the following description of the embodiments, which proceeds with reference to the accompanying drawings. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a schematic structural diagram of a carbon-heated cigarette according to a first exemplary embodiment of the present invention; [Figure 2] FIG. 2 is a schematic structural diagram of a carbon-heated cigarette according to a second exemplary embodiment of the present invention. [Figure 3]10A and 10B are enlarged top and right side views showing the structure of the graphite composite paper of a carbon-heated cigarette according to a second exemplary embodiment. [Figure 4] 4A to 4C are schematic structural diagrams of a smoke extraction unit according to an example. [Figure 5] 5A to 5C are schematic diagrams of a smoke extraction unit according to another example. [Figure 6] 6A and 6B are schematic structural diagrams of a smoke extraction section according to yet another example. DETAILED DESCRIPTION OF THE INVENTION

[0023] Exemplary, non-limiting embodiments of the present invention are described in detail below with reference to the accompanying drawings, which further illustrate the carbon heated cigarette according to the present invention.

[0024] The carbon-heated cigarette according to the present invention comprises a carbon rod section, a tobacco section, a smoke extraction section, and a filter section, which are arranged coaxially adjacent to one another in succession from the upstream side to the downstream side of the carbon-heated cigarette. The carbon-heated cigarette may further comprise composite paper wrapped around a portion of the carbon rod section adjacent to the tobacco section, a portion of the tobacco section adjacent to the carbon rod section, or the entire tobacco section. The smoke extraction section has a cavity extending through the smoke extraction section in the axial direction of the carbon-heated cigarette, and a side wall of the smoke extraction section has at least one side wall through-hole communicating with the cavity. Alternatively, the smoke extraction section is made of acetate, corrugated cardboard, or a paper-based material. The carbon-heated cigarette may further comprise an outer wrapping section wrapped around the composite paper, tobacco section, smoke extraction section, and filter section, the outer wrapping section having a wrapping through-hole formed at a position corresponding to the at least one side wall through-hole, allowing outside air to enter the smoke extraction section. For example, the diameter of the winding portion through-hole is equal to or greater than the diameter of the side wall through-hole.

[0025] According to the present invention, the method of use of a carbon-heated cigarette is similar to that of a conventional cigarette, in which the carbon rod portion is ignited for direct smoking. When a carbon-heated cigarette is smoked, heat generated by the combustion of the carbon rod portion is transferred to the tobacco portion through the composite paper. The smoke generated by the tobacco portion is mixed with air entering through the smoke extraction portion by active diffusion to form mainstream smoke, which then passes through the filter portion and enters the consumer's mouth. Because the smoke extraction portion has a cavity communicating with the outside through the sidewall through-holes, during smoking, air can enter the cigarette through the sidewall through-holes of the smoke extraction portion instead of passing through the tobacco portion. Fresh air flows through the sidewall through-holes, providing a good cooling effect on the mainstream smoke. As a result, the tobacco material is maintained within a certain temperature range, the composition and concentration of the mainstream smoke are ensured, and the effective utilization rate of the raw materials is improved. Furthermore, because the smoke from the heat source combustion is essentially separated from the mainstream smoke, the range of application of heat source formulations can be expanded.

[0026] Next, with reference to FIG. 1, a carbon heated cigarette according to a first exemplary embodiment of the present invention will be described in detail.

[0027] According to a first exemplary embodiment of the present invention, a carbon-heated cigarette includes a carbon rod portion 1, a tobacco portion 2, a smoke extraction portion 3, and a filter portion 4, which are coaxially and adjacently arranged in succession from the upstream side to the downstream side of the carbon-heated cigarette, as shown in FIG. 1 . For example, the tobacco portion 2 can be composed of various forms of tobacco raw materials wrapped in a paper substrate, or can be composed of other smoking substrates. The tobacco raw materials are tobacco substances composed of a specific formulation, and can be in the form of sheets, filaments, granules, molded rods, porous sticks, gels, etc., composed of tobacco materials wrapped in various forms of paper substrates. The carbon-heated cigarette can also include a metal composite foil paper 5 wrapped around a portion of the carbon rod portion 1 adjacent to the tobacco portion 2 and a portion of the tobacco portion 2 adjacent to the carbon rod portion 1. According to this embodiment, a thermally conductive barrier 6 is provided between the carbon rod portion 1 and the tobacco portion 2, separating the carbon rod portion from the tobacco portion. According to one example, the thermally conductive barrier 6 can be fixed to the downstream end surface of the carbon rod portion 1 by, for example, gluing, pressing, or other methods. The thermally conductive barrier 6 can be made of an air-impermeable, thermally conductive material including organic or inorganic materials. Preferably, the thermally conductive barrier 6 can be made of a highly thermally conductive inorganic material such as graphite, metal, or metal oxide.

[0028] Furthermore, the smoke extraction section 3 has a cavity 31 that penetrates the smoke extraction section in the axial direction of the carbon-heated cigarette, and at least one side wall through-hole 32 that communicates with the cavity 31 is formed in a side wall of the smoke extraction section 3. For example, two side wall through-holes 32 are exemplarily shown in Fig. 1. The carbon-heated cigarette may further include an outer wrapping section 7 that is wrapped around the outside of the metal composite foil paper 5, the tobacco section 2, the smoke extraction section 3, and the filter section 4, and the outer wrapping section has a wrapping section through-hole 70 formed in a position corresponding to the at least one side wall through-hole 32 to allow outside air to enter the smoke extraction section 3.

[0029] According to the first exemplary embodiment, when smoking a carbon-heated cigarette, the heat generated by the combustion of the carbon rod portion 1 is transferred to the tobacco portion 2 through the metal composite foil paper 5 and the thermally conductive barrier 6. The smoke generated by the tobacco portion 2 is mixed with the air entering the cavity 31 of the smoke extraction portion 3 through the side wall through-holes 32 by active diffusion to form mainstream smoke, which passes through the filter portion 4 and then enters the consumer's mouth.

[0030] According to an alternative embodiment, the outer wrapping portion 7 may further comprise an outer cigarette paper 71 and a receiver paper 72. The outer cigarette paper 71 is wrapped around the outside of the composite paper, tobacco portion, and smoke extraction portion, and the receiver paper 72 is wrapped around the outside of the filter portion and the portion of the outer cigarette paper 71 that is outside the smoke extraction portion. Alternatively, the outer wrapping portion may be made of a paper-based material, a foil-based material, or another film-based material that is air impermeable or has controlled air permeability.

[0031] FIG. 2 shows a schematic diagram of a carbon-heated cigarette according to a second exemplary embodiment of the present invention, in which the same components as those of the carbon-heated cigarette according to the first exemplary embodiment are given the same reference numerals and will not be described in detail herein.

[0032] According to a second exemplary embodiment of the present invention, a carbon-heated cigarette includes a carbon rod section 1, a tobacco section 2, a smoke extraction section 3, and a filter section 4, which are coaxially and adjacently arranged in succession from the upstream side to the downstream side of the carbon-heated cigarette. In this embodiment, the carbon rod section 1 is directly adjacent to the tobacco section 2. The carbon-heated cigarette also includes a graphite composite paper 5' wrapped around a portion of the carbon rod section 1 adjacent to the tobacco section 2 and a portion of the tobacco section 2 adjacent to the carbon rod section 1. Referring to FIG. 3, the graphite composite paper 5' may further include an inner graphite paper layer 51 and an outer cigarette paper layer 52, and the width of the inner graphite paper layer after expansion is smaller than that of the outer cigarette paper layer to ensure good overlap during bonding. The inner graphite paper layer is a heat management material formed by chemically treating high-carbon flake graphite, followed by high-temperature expansion and rolling. It can transfer heat to the tobacco material more effectively than isotropic foil-based materials commonly used in the prior art. In the second exemplary embodiment, the carbon rod portion is directly adjacent to the tobacco portion without a barrier, and the presence of the smoke extraction portion makes the drawing resistance of the carbon rod portion and the tobacco portion excessively large; and since the graphite paper is non-combustible and air-impermeable, when drawing, fresh air does not enter the cigarette through the carbon rod portion tightly wrapped with the graphite composite paper, and this part of the heat source does not burn; therefore, the structure and processing technology of the cigarette are simplified compared to cigarette products with a barrier.

[0033] Preferably, the thickness of the graphite composite paper is 30 μm to 80 μm. Alternatively, the thermal conductivity of the inner graphite paper layer in the paper plane direction may be greater than 400 W / m·K, and the thermal conductivity of the inner graphite paper layer in the thickness direction may be less than 10 W / m·K.

[0034] The structure of a smoke extraction unit according to one embodiment of the present invention will now be described with reference to FIGS. 4 to 6. According to one example, the cross-section of the cavity of the smoke extraction unit can have a regular or irregular shape. For example, FIGS. 4A to 4C show the cross-section of the cavity of the smoke extraction unit having regular shapes such as a circle, a hexagon, and a triangle, for illustrative purposes only. According to another example, the cavity of the smoke extraction unit can be composed of multiple sections with different diameters, thereby forming a ring-shaped through-hole hollow chamber, as shown in FIGS. 5A to 5C. According to yet another example, as shown in FIGS. 6A and 6B, the cavity of the smoke extraction unit can be composed of multiple channels uniformly distributed along the axial direction of the carbon-heated cigarette, and the number and diameter of the channels can be adjusted as needed.

[0035] While exemplary embodiments of the present invention have been described, those skilled in the art will recognize that modifications can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined in the following claims and their equivalents.

Claims

1. A carbon-heated cigarette, comprising a carbon rod section, a tobacco section, a smoke extraction section, and a filter section, which are arranged coaxially adjacent to each other in succession from the upstream side to the downstream side of the carbon-heated cigarette, The carbon-heated cigarette further comprises a composite paper wrapped around a portion of the carbon rod portion adjacent to the tobacco portion, a portion of the tobacco portion adjacent to the carbon rod portion, or the entire tobacco portion; The smoke extraction section has a cavity penetrating the smoke extraction section in the axial direction of the carbon heated cigarette, and a side wall of the smoke extraction section has at least one side wall through-hole communicating with the cavity; The carbon heated cigarette further includes an outer wrapping section wrapped around the composite paper, the tobacco section, the smoke extraction section, and the filter section, and the outer wrapping section has a wrapping section through-hole formed in a position corresponding to at least one side wall through-hole, allowing outside air to enter the smoke extraction section.

2. a thermally conductive barrier disposed between the carbon rod portion and the tobacco portion, separating the carbon rod portion from the tobacco portion; The composite paper is a metal composite foil paper. The carbon-heated cigarette according to claim 1.

3. The carbon heated cigarette according to claim 2 , wherein the thermally conductive barrier is fixed to a downstream end surface of the carbon rod portion.

4. 4. The carbon-heated cigarette according to claim 2 or 3, wherein the thermally conductive barrier is made of an air-impermeable thermally conductive material.

5. 2. The carbon-heated cigarette according to claim 1, wherein the composite paper is a graphite composite paper, the graphite composite paper including an inner graphite paper layer and an outer cigarette paper layer, and the width of the inner graphite paper layer is smaller than the width of the outer cigarette paper layer.

6. The carbon heated cigarette according to claim 5, wherein the thickness of the graphite composite paper is 30 μm to 80 μm.

7. 6. The carbon-heated cigarette according to claim 5, wherein the thermal conductivity of the inner graphite paper layer in the paper plane direction is greater than 400 W / m·K and the thermal conductivity of the inner graphite paper layer in the thickness direction is less than 10 W / m·K.

8. 2. The carbon-heated cigarette of claim 1, wherein the outer wrapping portion includes outer cigarette paper and receiving paper, the outer cigarette paper being wrapped around the outside of the composite paper, the tobacco portion, and the smoke extraction portion, and the receiving paper being wrapped around the filter portion and a portion of the outer cigarette paper that is outside the smoke extraction portion.

9. The carbon heated cigarette according to claim 1 , wherein the cross section of the cavity of the smoke extraction section has a regular shape or an irregular shape.

10. The carbon-heated cigarette according to claim 1 , wherein the cavity is formed by a plurality of portions having different diameters.

11. The carbon heated cigarette according to claim 1 , wherein the cavity is formed by a plurality of channels that are uniformly distributed and penetrate the carbon heated cigarette along an axial direction.

12. The carbon heated cigarette according to claim 1 , wherein the diameter of the winding portion through-hole is equal to or greater than the diameter of the side wall through-hole.

13. 2. The carbon-heated cigarette of claim 1, wherein the outer wrap is made from a paper-based material or a foil-based material that is air-impermeable or has controlled air permeability.

14. 10. The carbon heated cigarette of claim 1, wherein the smoke extraction portion is made of acetate, corrugated cardboard, or a paper-based material.

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