Tobacco aerosol cooling material and smoking article containing the same

Abstract

The present invention relates to an aerosol cooling material for tobacco, which comprises a porous foam or a porous sheet containing a metal having a thermal conductivity of 10 W / m·K to 5000 W / m·K.

Description

[Technical Field]

[0001] The present invention relates to an aerosol cooling material for tobacco and a smoking article containing the same. [Background technology]

[0002] When a user inhales the aerosol generated by heating the medium portion of a smoking article, heat may be generated, especially during the first puff (the first puff temperature is 65°C to 75°C), which may cause discomfort to the smoker. This phenomenon is caused by water vapor generated by heating the medium portion.

[0003] To solve these problems, conventional methods have been used, such as forming perforations in the wrapper of the smoking article, applying a moisture-absorbing material to the smoking article, or incorporating a cooling element containing polylactic acid with a low glass transition temperature into the smoking article. However, when forming perforations in the wrapper of the smoking article, the aerosol dilution rate increases, resulting in wasteful suction. When applying a moisture-absorbing material to the smoking article, the amount of atomization decreases due to the low water vapor content in the aerosol. On the other hand, when using a cooling element containing polylactic acid in a smoking article, the cooling effect on the aerosol is minimal.

[0004] Therefore, there is a need for the development of a smoking article that can lower the temperature of the aerosol generated from the medium portion without reducing the amount of atomization. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve the above problems, the present invention aims to provide a cooling material that can reduce the temperature of aerosol generated by heating the medium portion of a smoking article when the aerosol passes through the smoking article, while minimizing the space where water vapor condenses.

[0006] However, the problems that the present invention aims to solve are not limited to those mentioned above, and further problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0007] According to one embodiment of the present invention, there is provided an aerosol cooling material for tobacco, which comprises a porous foam or a porous sheet containing a metal having a thermal conductivity of 10 W / m·K to 5000 W / m·K.

[0008] Another embodiment of the present invention provides a smoking article comprising a medium portion and a filter portion, the smoking article comprising a tobacco aerosol cooling material, the tobacco aerosol cooling material comprising a metal with a thermal conductivity of 10 W / m·K to 5000 W / m·K, and made of a porous foam or a porous sheet. [Effects of the Invention]

[0009] The cooling material of the present invention is a disk of a certain thickness made in the form of a porous foam or sheet, and contains a metal with excellent thermal conductivity, so that it can lower the temperature of the aerosol generated from the medium without causing a significant change in the draw resistance of the smoking article and without losing water vapor.As a result, it is possible to provide a smoking article that reduces only the heat sensation of the first puff without causing unnecessary draw problems or a decrease in atomization amount.

[0010] The effects of the present invention are not limited to the effects described above, but should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description of the present invention or the claims. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 10 is a diagram showing a control volume of a medium portion of a smoking article model. [Figure 2] FIG. 10 shows a cooling section of a model smoking article. [Figure 3]FIG. 2 shows a filter portion of a model smoking article. [Figure 4] FIG. 10 shows the results of measuring the first puff temperature of mainstream smoke by adjusting the vapor density in a model smoking article. [Figure 5] FIG. 10 is a diagram showing the measurement results of the first puff temperature of mainstream smoke by adjusting the heat capacity of the porous medium 1 in the cooling section. [Figure 6] FIG. 10 is a diagram showing the measurement results of the first puff temperature of mainstream smoke by adjusting the length of the cooling section. [Figure 7] FIG. 10 is a diagram showing the measurement results of the first puff temperature of mainstream smoke by adjusting the length of the filter part. [Figure 8] FIG. 10 is a diagram showing the measurement results of the first puff temperature of mainstream smoke by adjusting the inner radius of the cooling section. [Figure 9] FIG. 10 shows the measurement results of the first puff temperature of mainstream smoke by adjusting the outer radius of the cooling section. [Figure 10] FIG. 10 is a diagram showing the measurement results of the first puff temperature of mainstream smoke by adjusting the heat transfer coefficient in the cooling section. [Figure 11] FIG. 10 is a diagram showing the measurement results of the first puff temperature of mainstream smoke by adjusting the thermal conductivity of the filter section. [Figure 12] 1 shows a side view of a smoking article in which a cooling material is included in a dual filter according to one embodiment of the present invention. [Figure 13] 1 is a side view of a smoking article in accordance with one embodiment of the present invention, in which a cooling material is included in a triple filter. [Figure 14] 1 is a diagram showing a side view of a smoking article in which a cooling material is included in a cooling section according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, various modifications may be made to the embodiments, and the scope of the patent application is not limited or restricted by such embodiments. It should be understood that all modifications, equivalents, or alternatives to the embodiments are included in the scope of the patent.

[0013] The terms used in the embodiments are merely used for the purpose of explanation and are not to be construed as being limiting. A singular expression includes a plural expression unless the context clearly indicates otherwise. In this specification, the terms "comprise" or "have" indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0014] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention pertains. Commonly used predefined terms should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted as having an ideal or overly formal meaning unless expressly defined herein.

[0015] In addition, in the description with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. In the description of the embodiments, if a detailed description of related known technology is determined to unnecessarily obscure the gist of the embodiments, the detailed description thereof will be omitted.

[0016] Furthermore, in describing components in the embodiments, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are used to distinguish the components from other components, and do not limit the essence, order, or sequence of the components.

[0017] Components having a common function with components included in one embodiment will be described using the same names in other embodiments. Unless otherwise specified, the description of one embodiment can be applied to other embodiments, and detailed description will be omitted to the extent that it overlaps.

[0018] Throughout the specification, when any part "comprises" any component, this does not exclude other components, but means that it may further include other components.

[0019] Throughout the specification, "smoking article" refers to an item capable of generating an aerosol, such as a cigarette, cigar, etc. Smoking articles may include an aerosol-generating substance or an aerosol-forming substrate. Smoking articles may also include solid substances based on tobacco raw materials, such as sheet tobacco, cut tobacco, and reconstituted tobacco. Smoking substances may include volatile compounds.

[0020] Also, throughout the specification, "upstream" or "upstream direction" means a direction away from the mouth of a user using the aerosol-generating article, and "downstream" or "downstream direction" means a direction toward the mouth of a user using the aerosol-generating article.

[0021] When using a smoking article, the heat of the first puff of mainstream smoke is caused by the moisture in the aerosol generated in the medium portion. To reduce this heat sensation in the first puff, we measured the first puff temperature by adjusting the vapor density in the smoking article, the heat capacity of the porous medium in the cooling portion, the length of the cooling portion, the length of the filter portion, the inner radius of the cooling portion, the outer radius of the cooling portion, the heat transfer coefficient of the cooling portion, and the thermal conductivity of the filter portion.

[0022] To investigate the process of water vaporization to form steam inside a medium, a control volume of the medium can be set up as shown in Figure 1. Here, it is assumed that the temperature, density, and velocity inside the control volume are constant regardless of position.

[0023] On the other hand, to investigate the steam cooling process in the cooling section, the cooling section can be set up as shown in Figure 2. The cooling section is a tube made of porous medium 1, and it is assumed to be a lumped system with a constant temperature throughout the porous medium tube. The inner radius r1 of the porous medium tube is 2.5 mm, the outer diameter r2 is 3.5 mm, and the length of the cooling section is l c is 12mm.

[0024] To investigate the steam cooling process of the filter section, the filter section can be configured as shown in Figure 3. The filter section is configured with a paper surrounding a porous medium 2. The length of the filter section, l, is ac is 14 mm, and the inner radius r of the paper surrounding the porous medium 2 p1 is 3.4mm, outer radius r p2 is 3.5mm.

[0025] The measurement results of the first puff temperature of mainstream smoke by adjusting the vapor density in the smoking article, the heat capacity of the porous medium 1 in the cooling section, the length of the cooling section, the length of the filter section, the inner radius of the cooling section, the outer radius of the cooling section, the heat transfer coefficient of the cooling section, and the thermal conductivity of the filter section are shown in Figures 4 to 11.

[0026] The values ​​of the vapor density, heat capacity of the porous medium 1 of the cooling section, length of the cooling section, length of the filter section, inner radius of the cooling section, outer radius of the cooling section, heat transfer coefficient of the cooling section, thermal conductivity of the filter section, and temperature of the vapor that finally reaches the smoker of currently used smoking articles are shown in Table 1 below, and the values ​​are indicated by asterisks in Figures 4 to 11.

[0027] [Table 1]

[0028] Based on the above results, it is expected that the first puff temperature of mainstream smoke can be reduced by increasing the length of the cooling section, increasing the length of the filter section, increasing the outer radius of the cooling section, increasing the heat transfer coefficient of the cooling section, or improving the thermal conductivity of the filter section in currently used smoking articles. In particular, it is found that improving the thermal conductivity of the filter section of currently used smoking articles is the most effective method for reducing the first puff temperature of mainstream smoke.

[0029] As a result, one embodiment of the present invention provides an aerosol cooling material for tobacco, which comprises a porous foam or porous sheet containing a metal with a thermal conductivity of 10 W / m·K to 5000 W / m·K. In other words, by applying a cooling material containing a metal with high thermal conductivity to a smoking article, the temperature of the aerosol generated in the medium portion can be efficiently lowered.

[0030] Any metal may be used as long as its thermal conductivity satisfies the above range. For example, the metal may be at least one selected from the group consisting of aluminum (about 237 W / m·K), copper (about 372 W / m·K), stainless steel (about 12 to 45 W / m·K), gold (about 295 W / m·K), silver (about 418 W / m·K), iron (about 72 W / m·K), and graphene (about 5000 W / m·K), but is not limited to the examples listed.

[0031] In the cooling material according to one embodiment of the present invention, the porous foam may have a disk-shaped structure of a certain thickness. This structure is more advantageous in preventing condensation of moisture in the aerosol generated from the medium portion because it has less space for moisture to condense due to collision with the cooling portion compared to a conventional cooling portion in which a sheet is folded lengthwise.

[0032] Meanwhile, the porous sheet may be a metal nonwoven fabric or a metal fabric made of metal threads. The porous sheet may be applied by crimping.

[0033] On the other hand, porous foam is more preferable than porous sheet in terms of maintaining the amount of atomization and drawing resistance of the smoking article and providing an excellent cooling effect.

[0034] The aerosol cooling material for tobacco according to one embodiment of the present invention may have porous properties, through which the aerosol generated from the medium portion is transported to the smoker's mouth.

[0035] Here, the porosity of the tobacco aerosol cooling material may be 60% to 90%, preferably 80% to 90%. Meanwhile, the porosity of the porous sheet may be 70,000 CU or more, and the porosity of the tobacco aerosol cooling material applied by pressing the porous sheet is within the above-mentioned range. If the porosity and porosity are lower than the lower limit of the above-mentioned range, the resistance to drawing increases, hindering the flow of mainstream smoke, which may result in wasted puffs or no smoking. Meanwhile, if the porosity and porosity are higher than the upper limit of the above-mentioned range, there is a problem in that the space occupied by the metal is small, preventing high-temperature steam from coming into contact with the metal, making it difficult to efficiently lower the temperature of the mainstream smoke.

[0036] The basis weight of the aerosol cooling material for tobacco according to one embodiment of the present invention is 40 g / cm 3 ~80g / cm 3 The basis weight may be 40 g / cm 3 If the basis weight is less than 80 g / cm, the thickness of the cooling material will be thin, and workability will decrease during the manufacture of smoking articles. 3 If it exceeds this, the thickness of the cooling material will be too thick and the porosity will be too low, which may hinder the air flow and increase the suction resistance.

[0037] The length of the tobacco aerosol cooling material according to one embodiment of the present invention may be 3 mm to 10 mm. If the length is less than 3 mm, the contact area with the cooling material is reduced, making it impossible to sufficiently lower the temperature of the first puff of mainstream smoke. On the other hand, if the length exceeds 10 mm, the entire filter must be replaced with the cooling material, which can lead to poor aesthetics, excessive cooling, and increased inhalation resistance, resulting in wasted inhalation or even no smoking.

[0038] In another embodiment of the present invention, there is provided a smoking article comprising a medium portion and a filter portion, the smoking article comprising a tobacco aerosol cooling material, wherein the tobacco aerosol cooling material comprises a metal having a thermal conductivity of 10 W / m·K to 5000 W / m·K and is made of a porous foam or a porous sheet.

[0039] The smoking article of the present invention may be, for example, a combustion-type or non-combustion-type smoking article. A combustion-type smoking article refers to a traditional cigarette. A non-combustion-type smoking article refers to a smoking article that is heated indirectly by electrical energy rather than by direct combustion.

[0040] The medium portion is an aerosol-forming material that releases volatile compounds when heated, and typically includes a tobacco substance containing nicotine. It may also include excipients, such as binders or other additives. For example, the tobacco medium included in the tobacco rod of the present invention may be manufactured in the form of granules containing a tobacco substance and an excipient. For example, the tobacco substance may be tobacco leaves, tobacco stems, tobacco dust generated during tobacco processing, and / or tobacco leaf blade strips. The tobacco leaves may be at least one selected from the group consisting of flue-cured, burley, oriental, cigarette leaves, and toasted tobacco. However, the present invention is not limited to the examples described above.

[0041] The filter section is located downstream of the media section and may be a cellulose acetate filter, a paper filter, or a filter made of a polymeric material, but is not limited to the examples given.

[0042] In a smoking article according to one embodiment of the present invention, the filter portion comprises the tobacco aerosol cooling material and is composed of a single or multiple filter segments. For example, the filter composed of multiple filter segments may be a double or triple filter.

[0043] The smoking article according to one embodiment of the present invention may further include a cooling unit between the medium unit and the filter unit. The cooling unit heats the medium unit to cool the generated aerosol, allowing the smoker to inhale the aerosol cooled to an appropriate temperature.

[0044] The cooling part may contain a biodegradable or natural polymer material. For example, polylactic acid may be used in the cooling part, and the content of polylactic acid may be 30% to 100%.

[0045] For example, the cooling unit may be a tubular structure having a hollow interior, through which the aerosol moves, and at this time, the temperature of the aerosol can be lowered through perforations, moisture adsorption materials, cooling materials, etc.

[0046] The cooling part contains the tobacco aerosol cooling material to maximize the cooling effect of the aerosol.

[0047] The temperature of the mainstream smoke of the smoking article according to one embodiment of the present invention may be 40° C. to 65° C. The temperature of the mainstream smoke of the smoking article is 5° C. to 25° C. lower than the temperature of the mainstream smoke of a smoking article that does not include the cooling material.

[0048] The moisture content within the smoking article according to one embodiment of the present invention may be 3 to 8 mg / cig. Typically, the moisture content of the medium portion of the smoking article may be 4.7 mg / cig to 7.4 mg / cig, and this is also the case for the smoking article according to one embodiment of the present invention. Due to the characteristics of the cooling material, the cooling material does not absorb moisture, and the aerosol moves quickly within the cooling material, making it less likely for moisture to be adsorbed and retained. Therefore, it is possible to provide a smoking article in which the moisture in the aerosol generated from the medium portion is hardly condensed, and the amount of atomization is unchanged.

[0049] The smoking article according to one embodiment of the present invention has a draw resistance of 98 mmH2O to 102 mmH2O, which is a slight difference of up to 6 mmWG compared to the draw resistance of a smoking article that does not contain a cooling material. In other words, it is possible to provide a smoking article that does not significantly reduce the draw resistance even when using the cooling material.

[0050] Hereinafter, the present invention will be described in more detail with reference to the embodiments, but the present invention is not limited to the following embodiments.

[0051] Test Example 1: Temperature measurement of the first puff in mainstream smoke depending on the material of the cooling part and whether or not there are perforations 1. Manufacturing of smoking articles Comparative Example 1 Smoking articles were manufactured that included a medium portion and a filter portion, the filter portion further including tipping paper (without perforations) surrounding the medium portion.

[0052] Comparative Example 2 It was produced in the same manner as Comparative Example 1, except that the tipping paper contained perforations.

[0053] Comparative Example 3 The smoking article was manufactured in the same manner as Comparative Example 1, except that it further included a cooling section between the medium section and the filter section, the cooling section was made of a paper filter material (moisture-absorbing material), and the tipping paper included perforations.

[0054] Comparative Example 4 The smoking article was manufactured in the same manner as in Comparative Example 1, except that the smoking article further included a cooling section between the medium section and the filter section, the cooling section being a paper tube, and the length of the cooling section being 12 mm.

[0055] Comparative Example 5 The smoking article was manufactured in the same manner as in Comparative Example 1, except that it further included a cooling section between the medium section and the filter section, and the cooling section was manufactured by cutting a material made of porous paper 24K coated with PLA film interleaving paper (thickness 15 μm) into a length of 12 mm and crimping it.

[0056] Comparative Example 6 The smoking article was manufactured in the same manner as in Comparative Example 1, except that it further included a cooling section between the medium section and the filter section, and the cooling section was manufactured by cutting a material made of silver foil base paper (basis weight 35 gsm) coated with PLA film interleaving paper (thickness 15 μm) into a length of 12 mm and crimping it.

[0057] Comparative Example 7 The smoking article was manufactured in the same manner as in Comparative Example 1, except that the smoking article further included a cooling section between the medium section and the filter section, and the cooling section was manufactured by cutting aluminum foil to a length of 12 mm and crimping it.

[0058] 2. Temperature measurement of the first puff of mainstream smoke The first puff temperature of the mainstream smoke in Comparative Examples 1 to 7 was measured as follows: A thermocouple was fixed 1 to 2 mm away from the center of the filter portion of the smoking article, and the smoking article was preheated for 35 seconds using a smoking attribute device. After that, the highest temperature was measured when the smoking article was puffed for 35 to 37 seconds. The results are shown in Table 2 below.

[0059] [Table 2]

[0060] Compared to Comparative Example 1, Comparative Examples 4 to 7, in which a cooling section was applied to the smoking article, showed a decrease in the first puff temperature of the mainstream smoke by approximately 43°C. Comparing Comparative Examples 4 to 7, it was found that regardless of whether the cooling section material was paper, polylactic acid, or aluminum foil, the first puff temperature was constant at 85°C to 90°C when using the smoking article, and therefore the first puff temperature did not change significantly depending on the material.

[0061] On the other hand, the first puff temperature of Comparative Example 2 was more than 60°C lower than that of Comparative Example 1, and Comparative Examples 4 to 7 showed a decrease of about 20°C. This means that forming perforations is more effective in lowering the first puff temperature of mainstream smoke than using a different material for the cooling section. However, in the case of Comparative Example 2, the air dilution rate was higher at 65% than that of Comparative Example 1, which resulted in a decrease in the tobacco taste and wasted puffs.

[0062] Comparative Example 3, which used both perforations and a moisture-absorbing material, showed a result in which the initial puff temperature was reduced by about 20°C compared to Comparative Example 2. However, the use of a moisture-absorbing material resulted in a problem of a 30% decrease in vapor density compared to Comparative Example 2, resulting in a decrease in atomization amount.

[0063] Test Example 2: Measurement of the first puff temperature, atomization amount, and drawing resistance of mainstream smoke by applying aerosol cooling material for cigarettes 1. Manufacture of cooling materials (1) Design of cooling material made of porous aluminum foam The design details of the cooling material made of porous aluminum foam are shown in Table 1.

[0064] [Table 3]

[0065] (2) Manufacturing cooling materials made from porous aluminum nonwoven fabric The cooling material made of aluminum nonwoven fabric was manufactured by the following method. First, a porous nonwoven fabric filter made of polypropylene fiber yarn was immersed in an aluminum precursor ink containing 15 mM AlCl3 and 53 mM LiAlH4 and then dried to produce an aluminum nonwoven fabric. The cooling material was manufactured by compressing the aluminum nonwoven fabric and then winding it up. The physical properties of the manufactured cooling material are shown in Table 4 below.

[0066] [Table 4]

[0067] 2. Manufacturing of smoking articles Embodiment 1 A smoking article was manufactured that included a medium section, a cooling section 10 located downstream of the medium section, and a filter section 14 located downstream of the cooling section. The filter section was a double filter that included a cooling material 16 made of porous aluminum foam (FIG. 12). The filter section included a surrounding tipping paper that had perforations formed in the tipping paper.

[0068] Embodiment 2 The filter section 24 located downstream of the cooling section 20 was a triple filter, and the triple filter contained a cooling material 26, which was manufactured in the same manner as in embodiment 1, except that the cooling material 26 was a cooling material made of porous aluminum foam (FIG. 13).

[0069] Embodiment 3 The cooling section 30 was manufactured in the same manner as in embodiment 1, except that the cooling section 30 consisted of two cooling segments, contained a cooling material 36 made of porous aluminum foam, and a filter section 34 consisting of a single filter segment was located downstream of the cooling section (FIG. 14).

[0070] Embodiment 4 It was manufactured in the same manner as in Example 1, except that a cooling material made of porous aluminum nonwoven fabric was used instead of the cooling material made of porous aluminum foam (FIG. 12).

[0071] Embodiment 5 It was manufactured in the same manner as in Example 2, except that a cooling material made of porous aluminum nonwoven fabric was used instead of the cooling material made of porous aluminum foam (FIG. 13).

[0072] Embodiment 6 It was manufactured in the same manner as in Example 3, except that a cooling material made of porous aluminum nonwoven fabric was used instead of the cooling material made of porous aluminum foam (FIG. 14).

[0073] 3. Temperature measurement of the first puff of mainstream smoke The first puff temperature of mainstream smoke in embodiments 1 to 6 was measured as follows: A thermocouple was fixed at a position 1 to 2 mm away from the center of the filter portion of the smoking article, and the smoking article was preheated for 35 seconds using a smoking attribute device, and then puffed for 35 to 37 seconds, and the highest temperature was measured.

[0074] The results are shown in Table 5 below.

[0075] [Table 5]

[0076] In comparison with Comparative Example 2, the first puff temperature of mainstream smoke in Embodiments 1 to 4 and 6 was lower by 2.1°C to 18.5°C.

[0077] Furthermore, under the same conditions, each of the first puff temperatures of mainstream smoke was lower in the first puffs of the first to third embodiments than in the first to sixth embodiments, respectively, demonstrating that the cooling material made of porous foam is more effective in reducing the temperature of the aerosol than the cooling material made of porous sheet.

[0078] On the other hand, in the case of Comparative Example 3, which includes a cooling section made of a moisture-adsorbing material, the result was that the temperature of the first puff of the mainstream smoke was significantly reduced, as in Embodiments 1 to 6. However, due to the presence of the moisture-adsorbing material, the moisture content in the first puff was reduced compared to Embodiments 1 to 6, and the amount of atomization was also significantly reduced.

[0079] Furthermore, when the cases in which perforation was prevented in Embodiments 1 to 6 were compared with the draw resistance in Comparative Example 1, it was confirmed that the cooling material of the present invention did not affect the draw resistance of the smoking article.

[0080] From the above test examples, it can be predicted that by using a smoking article containing the cooling material described in the claims of the present invention, it is possible to provide a smoking article that efficiently lowers the temperature of the aerosol generated from the medium portion without the problems of reduced atomization amount and reduced inhalation resistance.

[0081] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the present invention is not limited to the above-described embodiments, and a person skilled in the art can apply various technical modifications and variations based on the above. For example, the described techniques may be performed in an order different from that described, and / or the components of the described systems, structures, devices, circuits, etc. may be combined or combined in a form different from that described, or may be substituted or replaced by other components or equivalents, and still achieve appropriate results.

[0082] Accordingly, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims. [Explanation of symbols]

[0083] 10, 20, 30: Cooling section 14, 24, 34: Filter section 16, 26, 36: Cooling material

Claims

1. It contains a metal having a thermal conductivity of 10 W / m K to 5000 W / m K, An aerosol cooling material for tobacco, comprising a porous foam or porous sheet.

2. 2. The tobacco aerosol cooling material according to claim 1, wherein the porous foam is in the form of a disk.

3. 2. The tobacco aerosol cooling material according to claim 1, wherein the porous sheet is made of a metal nonwoven fabric or a metal woven fabric.

4. The tobacco aerosol cooling material according to claim 1, wherein the porous sheet is applied by being pressed.

5. 2. The tobacco aerosol cooling material according to claim 1, wherein the metal is at least one selected from the group consisting of aluminum, copper, stainless steel, gold, silver, iron, and graphene.

6. 2. The tobacco aerosol cooling material according to claim 1, wherein the porosity of the tobacco aerosol cooling material is 60% to 90%.

7. The basis weight of the tobacco aerosol cooling material is 40 g / cm ２ ~80g / cm ２ 2. The tobacco aerosol cooling material according to claim 1, wherein:

8. 2. The tobacco aerosol cooling material according to claim 1, wherein the length of the tobacco aerosol cooling material is 3 mm to 10 mm.

9. A smoking article comprising a medium portion and a filter portion, the smoking article comprises a tobacco aerosol cooling material; The tobacco aerosol cooling material comprises a metal having a thermal conductivity of 10 W / m·K to 5000 W / m·K, and is made of a porous foam or a porous sheet.

10. The smoking article according to claim 9, wherein the filter portion comprises the tobacco aerosol cooling material and is composed of a single or multiple filter segments.

11. The smoking article further includes a cooling section between the medium section and the filter section, The smoking article according to claim 9 , wherein the cooling portion comprises the tobacco aerosol cooling material.

12. The smoking article according to claim 9, wherein the smoking article is a combustible or non-combustible smoking article.

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