Thermally conductive wrapper for cigarettes using carbon heat source and cigarettes containing same

Abstract

The present invention provides a thermally conductive wrapper for tobacco with a carbon heat source, the wrapper being a three-layer paper including a first insulating layer, a metal layer, and a second insulating layer, and a tobacco with a carbon heat source including the wrapper.

Description

[Technical field]

[0001] The present invention relates to a thermally conductive wrapper for carbon heat source cigarettes and cigarettes containing same. [Background technology]

[0002] In recent years, many smoking articles have been proposed that are heated rather than combusted. Unlike conventional smoking articles, these non-combustion smoking articles do not burn the tobacco medium, but are used by inhaling the aerosol generated by heating the tobacco medium. One type of such heated smoking article is a tobacco product that uses a carbon heat source.

[0003] The tobacco to which the carbon heat source is applied generates an aerosol by heat transfer from the carbon heat source to the tobacco medium located downstream of the carbon heat source.

[0004] Unlike typical heated electronic cigarettes, which use dedicated devices, tobacco products using a carbon heat source have a smoking style similar to that of traditional cigarettes, and are expected to improve the convenience and satisfaction of smoking for consumers. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO2009 / 022232(2009.02.19) Summary of the Invention [Problem to be solved by the invention]

[0006] It is an object of the present invention to provide a carbon heat source that is optimized to enable effective heat transfer of a cigarette to which the carbon heat source is applied, and a thermally conductive wrapper that enhances heat transfer, and a cigarette containing the same. [Means for solving the problem]

[0007] The present invention provides a thermally conductive wrapper for tobacco with a carbon heat source, characterized in that the wrapper is a three-layer paper including a first insulating layer, a metal layer, and a second insulating layer.

[0008] In one embodiment of the present invention, the insulating layer may be made of a paper material and the metal layer may be made of an aluminum material.

[0009] The present invention also provides a tobacco with a carbon heat source, the tobacco comprising a carbon heat source, a medium, a thermally conductive wrapper enclosing the carbon heat source and a portion of the medium, and cigarette paper enclosing the remainder of the medium, the thermally conductive wrapper and an outer skin enclosing all of the elements except the thermally conductive wrapper, a barrier being formed between the carbon heat source and the medium, and the thermally conductive wrapper being a three-layer paper including a first insulating layer, a metal layer, and a second insulating layer.

[0010] In another embodiment of the present invention, the thermally conductive wrapper may have a ratio of a length of a front portion enclosing the carbon heat source to a length of a rear portion enclosing the medium of 1:1.1-3.

[0011] In a further embodiment of the invention, the length of the rear portion may be greater than the length of the front portion.

[0012] In a further embodiment of the present invention, the tobacco has perforations formed on the outer circumferential surface of the medium portion.

[0013] In a further embodiment of the invention, the perforations are located between 0.5 and 3 mm from the barrier.

[0014] In a further embodiment of the invention, the heat source has a length of 5-15 mm and the tobacco paper has a length of 3-8 mm.

[0015] In a further embodiment of the invention, the barrier may have a thickness of 0.1 to 0.3 mm. Effect of the Invention

[0016] The thermally conductive wrappers of the present invention and cigarettes incorporating same are characterized by being optimized for efficient heat transfer and efficient nicotine delivery. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a diagram showing the structure of the carbon heat source-applied cigarette of the present invention. [Diagram 2] FIG. 2 illustrates the length-related configuration of a thermally conductive wrapper in a cigarette of the present invention. [Diagram 3] FIG. 2 shows the positional arrangement of perforations in a cigarette of the present invention. [Figure 4] 1 illustrates an area of ​​computational interpretation performed in accordance with an embodiment of the present invention. [Diagram 5] 1 shows the cigarette shapes and computer analysis conditions used in optimization tests of an embodiment of the present invention. [Figure 6] 1 shows the lattice used for the computational interpretation. [Figure 7] A test temperature distribution is shown for the contact surfaces (left: heat source-barrier, right: heat source-thermally conductive element). [Figure 8] 1 shows a surface on which a test temperature profile was entered. [Figure 9] 1 shows a heat conductor around the tobacco medium. [Figure 10] 4 illustrates the amount of heat transferred to the tobacco medium over time. [Figure 12] 1 shows the results of examining the volume-averaged temperature change of a tobacco medium over time. [Figure 13] The results of confirming the amount of nicotine generated in the tobacco medium are shown (Nicotine 1, 2, and 3 indicate the nicotine peak numbers shown in the FT-IR results). [Figure 14] The results of confirming the amount of nicotine excreted over time are shown below. [Figure 15]The results of confirming the change in medium temperature (volume-averaged) over time for each design plan are shown below. [Figure 16] The thermal conductivity factors of the design proposal and the tobacco medium temperature distribution (Interpuff 4) were confirmed. [Figure 17] The results of checking the tobacco medium temperature distribution are shown. [Figure 18] The results of checking the distribution of nicotine emissions for each design are shown below. [Figure 19] The results of confirming the amount of nicotine produced depending on the medium distance for each design plan are shown below. [Figure 20] The results of confirming the total amount of nicotine emitted for each design proposal are shown below (nicotine number indicates the peak number from the TG-FTIR test). [Figure 21] The results of confirming the change in medium temperature (volume-averaged) over time for each drilling position condition are shown below. [Figure 22] The results of checking the temperature distribution of the tobacco medium for each perforation position condition are shown. [Diagram 23] The results of checking the amount of air entering the perforation for each interpretation condition are shown below. [Figure 24] The results of confirming the change in medium temperature when perforation (f) is used are shown below. [Diagram 25] The results of confirming the distribution of nicotine production amount for each perforation position condition are shown. [Figure 26] The results of confirming the amount of nicotine generated depending on the medium distance for each perforation position condition are shown below. [Figure 27] The results of confirming the total amount of nicotine emitted for each perforation position condition are shown (nicotine number indicates the peak number from the TG-FTIR test). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Demand for heated electronic cigarettes is increasing. Many heated electronic cigarettes are equipped with a device in a structure of [device + dedicated stick], and a new type of cigarette has been developed in which a carbon-based heat source is applied to the tip of the cigarette, providing a smoking style similar to that of a regular cigarette. Here, the present invention has confirmed the heat transfer phenomenon between a heat source or medium that has a smoking style (ignition, start of smoking) similar to that of a regular cigarette, and is excellent in smoking and smoke volume at the beginning of smoking, and has designed a cigarette with a carbon heat source, completing the present invention.

[0019] Here, the present invention provides a thermally conductive wrapper for cigarettes using a carbon heat source, characterized in that the wrapper is a triple-layer paper including a first insulating layer, a metal layer, and a second insulating layer.

[0020] The present invention also provides a cigarette with a carbon heat source, the cigarette comprising a carbon heat source, a medium, a thermally conductive wrapper enclosing the carbon heat source and a portion of the medium, and cigarette paper enclosing the remainder of the medium, and an outer skin enclosing the thermally conductive wrapper and all of the elements except the thermally conductive wrapper, wherein a barrier is formed between the carbon heat source and the medium, and the thermally conductive wrapper is a three-layer paper including a first insulating layer, a metal layer, and a second insulating layer.

[0021] The present invention will now be described in more detail.

[0022] As shown in FIG. 1, the present invention provides a thermally conductive wrapper 100 for cigarettes with a carbon heat source, characterized in that the wrapper is a triple-layered paper including a first insulating layer 101, a metal layer 102, and a second insulating layer 101. The insulating layer in the wrapper is made of a paper material, and the metal layer is made of an aluminum material. In conventional tobacco products, aluminum materials are used as thermally conductive wrappers, and materials in which paper and aluminum materials are laminated are also used. However, the double-layered paper used in the conventional products has a problem that the frictional force with the carbon heat source is insufficient, causing the carbon heat source to fall off the cigarette. Meanwhile, the present invention uses a thermally conductive wrapper having a triple-layered paper structure that can prevent the carbon heat source from falling off, so that the carbon heat source can be stably provided in the cigarette.

[0023] As shown in FIG. 1, the present invention also provides a cigarette for use with a carbon heat source, which comprises a carbon heat source 200, a medium 400, a thermally conductive wrapper 100 enclosing the carbon heat source 200 and a portion of the medium 400, and cigarette paper 103 enclosing the remainder of the medium, and an outer skin 500 enclosing the thermally conductive wrapper and all of the elements except the thermally conductive wrapper, and a barrier 300 is formed between the carbon heat source and the medium.

[0024] 2, in the thermally conductive wrapper, the ratio of the length 100a of the front portion enclosing the carbon heat source to the length 100b of the rear portion enclosing the medium may be 1:1.1 to 3. The ratio is designed based on the results of the embodiment of the present invention, and may be preferably 1:1.1 to 2, but is not limited to the above numerical value as long as the length of the rear portion is designed to be longer than the length of the front portion. By forming the length of the rear portion to be longer, heat transfer to the medium can be efficiently performed.

[0025] In a cigarette using a carbon heat source, the barrier surrounding the tobacco medium and the heat conductive element are the main heat supply sources, and when smoking, the temperature of the medium is rapidly decreased by the air flowing into the cigarette, but the heat transfer by the rear part and the barrier increases, and the heat of the medium is transferred to the rear part of the medium by the air flow flowing into the medium, so that the amount of heat transfer increases rapidly. During interpuff time when smoking is not performed, the medium is mainly heated by the barrier that is in direct contact with the carbon heat source, and some of the heat escapes to the three-layer paper. That is, while smoking is performed, the barrier and the rear part of the three-layer paper are all heating bodies, and the cigarette paper plays a role of discharging heat, and during the interpuff, which is the time between smoking, only one of the barrier and the rear part of the three-layer paper plays a role of heating body, and the remaining part and the cigarette paper play a role of discharging heat. In the present invention, the length of the rear part is increased to decrease the temperature of the front part, thereby increasing the temperature of the rear part and increasing the amount of nicotine discharged.

[0026] In one embodiment of the present invention, the heat source is a solid combustible heat source containing carbon. The heat source has a substantially cylindrical shape, and the length 200a of the heat source is 5 to 15 mm.

[0027] In addition, in the cigarette paper of the present invention, the length 103a of the cigarette paper may be 3 to 8 mm, but may be freely changed depending on the shape and size of the product to be manufactured.

[0028] The cigarette of the present invention includes a non-combustible, substantially air impermeable barrier between the downstream end face of the carbon heat source and the medium, which helps to prevent or reduce combustion or thermal degradation of the medium during use of the cigarette.

[0029] Also, referring to Figure 3, the cigarette of the present invention has perforations 10, 20, 30 formed in the outer peripheral surface of the medium portion. The position of the perforations may be varied, but the perforations are preferably formed at a position between 0.5 and 3 mm from the barrier, and may be formed at position 10 as shown in Figure 3. The perforations may be formed at a position 0.5 to 1.5 mm from the upstream end of the medium (the end of the barrier), but are not limited to this.

[0030] Referring to FIG. 1, in addition to the above-mentioned components, the device may further include a tube filter 600, a first fluid 700, a second fluid 800, an acetate filter 900, and a cardboard tube 1000.

[0031] The medium 400 may be manufactured in a sheet or a strand. The medium may be made of shredded tobacco sheets. The medium may contain other additives such as flavoring agents, humectants, and / or organic acids, and aromatic liquids such as menthol or moisturizers may be added by spraying them onto the medium.

[0032] The cigarette may include filter elements such as a tube filter 600 and an acetate filter 900, and the acetate filter 900 may be an acetyl cellulose filter. Meanwhile, there is no limitation on the shape of the filter. For example, the filter may be a cylindrical rod, or a tube-type rod including a hollow inside. The filter may also be a resin-type rod. If the filter is composed of a plurality of segments, at least one of the plurality of segments may be manufactured in a different shape. The filter may be manufactured to generate a flavor. For example, an aromatic liquid may be sprayed onto the filter, or a separate fiber coated with an aromatic liquid may be inserted into the filter.

[0033] The filter may also include at least one capsule. Here, the capsule may perform a function of generating flavor or a function of generating aerosol. For example, the capsule may have a structure in which a liquid containing a flavoring agent is enveloped in a coating. The capsule may have a spherical or cylindrical shape, but is not limited thereto.

[0034] Also, the cigarette may include a cooling fluid inside the cigarette. The fluid may be expressed as a cooling segment, and may be made of a polymeric material or a biodegradable polymeric material. For example, the cooling segment may be made of pure polylactic acid, but is not limited thereto. Alternatively, the cooling segment may be made of acetyl cellulose having a plurality of holes. However, the cooling segment is not limited to the above examples, and may be any material as long as it can perform the function of cooling the aerosol. Also, a cardboard tube may be included to support the fluid portion.

[0035] The final outer shell 500 may be a paper material such as a paper that encases a tripolymer paper, a cigarette paper, a tube filter, a fluid and an acetate filter, and the final outer shell 500 may be manufactured in a manner in which at least one of fillers, ceramics, silicon carbide, sodium citrate, potassium citrate, aramid fiber, nanocellulose, and SWNT is coated, but is not limited to the above range.

[0036] Hereinafter, the 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 the embodiments. It should be understood that all modifications, equivalents, or alternatives to the embodiments are included in the scope of the patent.

[0037] In the embodiments, the terms used 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 "include" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, and should be understood as not precluding the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0038] 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 belongs. 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 ideal or overly formal unless expressly defined in this specification.

[0039] In the following, the embodiments will be described in detail with reference to the accompanying drawings. In the description with reference to the drawings, the same components are given the same reference numerals regardless of the reference numerals, and the duplicated description thereof will be omitted. EXAMPLES

[0040] In this embodiment, a 3D computerized interpretation model of a cigarette was created to grasp the heat transfer mechanism of the carbon heat source and the medium. In order to improve the accuracy of the model, the experimental temperature distribution of the carbon heat source was reflected in the model, and the medium temperature due to the shape change was derived. Based on this, the amount of nicotine and tar generated in the medium was predicted.

[0041] 1. Cigarette 3D Computer Interpretation The 3D shape and lattice of the cigarette for computer interpretation were created using Fluent / Gambit (Figure 4). Since the shape is axially symmetric, only 1 / 4 of the area was drawn, and the symmetry plane was applied using the Symmetry condition.

[0042] The perforations were rectangular (0.542mm x 0.188mm) with a total of eight in a row along the circumference. In the computerized analysis, only a quarter of the cigarette was considered, so there were two perforations, and the external air area surrounding the cigarette had a radius of 200mm and a length of 300mm. The components of the cigarette and the conditions for the computerized analysis are shown in Figure 5.

[0043] 2. Calculation grid, calculation model and boundary conditions The grid used for the computerized interpretation is shown in Figure 6. Small grid sizes were used for the barrier, heat conduction elements, and paper because they are extremely thin. Larger grid sizes were used for the relatively large heat source and medium, while the less important external atmosphere and filter parts were calculated using highly expandable tetrahedral grids to reduce calculation time. The different grid sizes were linked using Fluent's Interface function.

[0044] A transient calculation was performed to understand the temperature change over time inside the cigarette. Mass, momentum, and energy storage equations were considered to simulate the gas flow and heat transfer developments. A general-purpose turbulence model, Realizable Ke, was used to simulate the flow of air from the outside atmosphere and through the perforations. To shorten the calculation time in this computational interpretation, the conservation equation of chemical species was removed, but a nicotine reaction rate model was added to the UDF code in the tobacco medium to predict the amount of nicotine produced in the tobacco medium. The governing equations and calculation models used in the computational interpretation are shown in Table 1 below.

[0045] [Table 1]

[0046] The physical properties of each element used in the computational analysis are shown in Table 2. When inhaling, air flows in through the perforations and passes through the tobacco medium-tube filter-paper tube-acetate filter. The tobacco medium and acetate filter can be expressed as porous media, and the resistance applied to the fluid here is expressed as the following equation.

[0047] TIFF0007623073000002.tif53167

[0048] Here, the inertial resistance C2 was ignored and the permeability was determined to be α. Therefore, the size of the flow resistance is proportional to the fluid velocity. Here, the porosity of the tobacco medium is 0.62 and the permeability is 5.70×10 -10 m 2 The barrier and the middle of the triple-layer paper are aluminum, and the physical properties are based on A1050. The final outer skin, the outer side of the triple-layer paper, and the paper used as the material for the paper core are both 60g / m2. 2 The density of each element was determined by dividing the thickness of the element by the basis weight. The material of the tube filter and acetate filter was assumed to be PLA. The permeability of the acetate filter was 2.50 × 10, which was obtained from reference. -10 m 2 and the porosity was assumed to be 0.62, similar to that of tobacco leaves.

[0049] [Table 2]

[0050] For the carbon heat source in the cigarette, experimental temperature distribution data of the heat source was input at the heat source-barrier and heat source-thermally conductive element contact surfaces.

[0051] The temperature distributions entered at the heat source-barrier and heat source-thermal conductive element contact surfaces are shown in Figure 7, and the positions are shown in Figure 8. The temperature T2 at the heat source-barrier contact surface is a function of time t and heat source height h. The temperature T3 at the heat source-thermal conductive element contact surface is a function of t and radius r. Here, it is assumed that there is no temperature change in the circumferential direction. The temperature T1 in front of the heat source is assumed to be T2 (h=0), and the temperature of this part has almost no effect on heat transfer to the medium.

[0052] The smoking condition in the cigarette test was 55 ml per 2 seconds, so the computerized interpretation model was set to release 6.875 ml of gas per second. The interpuff interval was 30 seconds, and computerized interpretation was performed for a total of 12 puffs. The external atmosphere surrounding the cigarette was set to 1 atmosphere and room temperature air.

[0053] The total calculation time was 360 seconds, the time interval was set to 0.1 seconds, and 100 calculations were performed for each time interval.

[0054] 3. Results of computerized interpretation 3.1. Results of interpretation of standard conditions: Application of design plan (1) drilling (a) In order to calculate the nicotine production of the tobacco medium, the temperature distribution of the medium must be predicted first. The barrier and thermally conductive elements surrounding the tobacco medium are the main heat sources that heat the medium, and when inhaling, the cooling caused by the room temperature air flowing in from the perforations and the phenomenon of convection heat transfer also occur in a complex manner. Therefore, in the results of the computer analysis, the temperature distribution and heat transfer phenomenon inside the medium were grasped according to time, especially taking into account the puff.

[0055] As shown in Figure 9, the elements related to the heat conduction of the medium are the barrier, the 3-polymer paper, and the cigarette paper, and although the tube filter behind the medium also faces the medium, it was deemed to have little effect and was ignored in the analysis. The part of the 3-polymer paper that contacted the heat source was named the 3-polymer paper (front), and the part that contacted the medium was named the 3-polymer paper (rear).

[0056] Figure 10 shows the amount of heat transferred to the tobacco medium over time. On the horizontal axis, time is 3, 35, 67, 99...55 seconds indicate the time of inhalation. In the graph, the blue line indicates the amount of heat transfer, and the red dotted line is an auxiliary line to distinguish the effects of puff and interpuff (between puffs, normal time). First, the amount of heat transfer is extremely low during interpuff, and gradually decreases over time. Meanwhile, the amount of heat transfer during puff has a shape that increases suddenly for an instant. If the peaks of the amount of heat transfer during puff are connected, it shows a shape that increases and then decreases over time, which is the same as the temperature distribution of the medium. When calculated arithmetically, the tobacco medium absorbed 252 W of heat during the total computation time of 362 seconds. Of this, the amount of heat transfer during interpuff has a slope of approximately -1.02 x 10 -4 Since the heat transfer rate is about W / s, integrating this over time gives 6 W. Therefore, the heat absorbed by the puff is 246 W, which is 97.6% of the total heat absorbed by the medium. Therefore, mathematically, it can be seen that the heat transfer of the medium is dominated by the puff.

[0057] The heat transfer rate of the cigarette paper is always negative, so it absorbs heat, while the barrier and the 3-ply paper (rear) provide and absorb heat to the medium depending on the time. At the beginning of smoking, the temperature of the part in contact with the heat source and the 3-ply paper (front) is high, and the barrier side is low. The heat source is ignited at the end, and the heat is gradually transferred to the barrier side, but the barrier side is not heated separately before 35s after the start of smoking. Therefore, the heat generated by the heat source is transferred from the 3-ply paper (front) to the 3-ply paper (rear) to the tobacco medium, and some of the heat escapes through the barrier and cigarette paper. In the middle of smoking, the part in contact with the heat source and the 3-ply paper (front) is lower in temperature than the part in contact with the barrier. Therefore, the direction of heat transfer is different from before, from the barrier to the tobacco medium, and some of the heat escapes through the 3-ply paper (rear) and cigarette paper. In the latter half of smoking, the part in contact with the 3-ply paper (front) as the heat source burns is the highest temperature. Therefore, the direction of heat transfer is similar to that at the beginning of smoking. This heat transfer mechanism applies to the interpuff, and the mechanism during the puff is relatively simple. The medium is cooled by the air flowing in through the perforations, so the temperature of the medium is much lower than that of the barrier and the 3-layer paper (rear). Therefore, during the puff, heat suddenly flows into the barrier and the 3-layer paper (rear), and some of that heat is discharged to the cigarette paper.

[0058] Figure 11 shows the temperature distribution inside the medium during puff or interpuff. During puff, room temperature air flows in through the perforations, which cools a considerable area inside the medium. In particular, since the perforations are located near the barrier, the temperature of the area of ​​the medium in contact with the barrier also drops sharply. During puff, the heat from the front of the medium spreads, resulting in an increase in the temperature of the periphery and center of the cigarette paper at the rear of the medium. The temperature distribution during interpuff showed that the temperature was high near the center on the side in contact with the barrier and low at the rear of the medium.

[0059] Figure 12 shows the temperature change of the tobacco medium over the entire smoking time. The average temperature rises over time, then reaches its highest point in the middle of smoking, and then gradually decreases. The temperature suddenly decreases at each inhalation point, then quickly recovers. The barrier and each thermally conductive element, which are solid materials that make up the tobacco, have high specific heat, so even if the temperature changes during the puff, it quickly recovers to the previous level.

[0060] FIG. 13 shows the Puff number, i.e., the amount of nicotine produced over time. Red means that nicotine has been completely discharged from the medium, and blue means that it has not yet been discharged. In the figure, the numbers 1, 2, and 3 after Nicotine indicate the peak numbers when nicotine is discharged in the FT-IR measurement data for the tobacco medium. When the tobacco medium is heated, nicotine is not discharged all at once, but is discharged over various temperature ranges, showing a multi-peak form. The kinetic parameters of each peak are as shown in Table 3. As time passes, nicotine shows a form that is consumed from the front, and most of nicotine 1 is discharged at a relatively early point. In the case of nicotine 2 and nicotine 3, they show a form that still remains even in Puff 12 (355 seconds), and nicotine 3 is particularly high because of its high activation energy. Therefore, nicotine can be efficiently generated by transferring heat to the rear of the tobacco medium, especially near the cigarette paper.

[0061] [Table 3]

[0062] FIG. 14 shows the discharge of nicotines 1 to 3 and total nicotine over time. At the beginning of smoking (3 to 35 seconds), the discharge of nicotine 1 gradually increases even without inhalation. This is because nicotine 1 is easily discharged at a low temperature when the front of the tobacco medium gradually heats up. However, after Puff 2 (35 seconds), the amount of nicotine 1 generated also increases rapidly only at the moment of the Puff, and is not generated separately under normal circumstances. This is because the rear of the tobacco medium is not normally consumed, and nicotine is generated by the heat that spreads at the moment of the Puff. Therefore, it can be seen that the Puff, i.e., thermal diffusion, plays an important role even in nicotine 1, which has low activation energy. Nicotine 2 and 3 begin to be discharged slowly due to high activation energy and gradually increase. Although they increase stepwise due to the Puff, the range is extremely small. Therefore, nicotine 2 and 3 can be completely consumed by transmitting heat that is higher than that during the Puff. Each nicotine was excreted at 99.9%, 75.9%, and 46.5% of the total amount, respectively.

[0063] 3.2.Interpretation of design proposals Figure 15 shows the change in medium temperature over time for each design. The temperature was the average value of the medium volume. Design plan 1 had the highest medium temperature over all time periods. Design plan 2 was also higher than design plan 3, but the difference was not large.

[0064] FIG. 16 shows the temperature distribution inside the tobacco medium for each design. The temperature trend is the same for all time periods, regardless of the division between puff and interpuff, so the results are shown representatively for the middle part of smoking (Interpuff 4). Design plan 1 has a longer triple-ply paper (rear) than designs 2 and 3. Therefore, it can be seen that the high temperature area is distributed more widely inside the tobacco medium. In addition, designs 2 and 3 have longer cigarette paper, so the amount of heat absorbed increases even if it is small. FIG. 17 shows the temperature distribution of the tobacco medium in a graph. Design plan 1 has a longer triple-ply paper (rear) than the other designs. Therefore, the temperature decreases at the front of the medium because the heat from the heat source is diffused over a wider area, but the effect is small. And the heat can be transferred to the rear of the medium more than the other designs, so the medium temperature increases. When comparing design plans 2 and 3, the temperature of design plan 2 is generally higher, but this is because the length of the triple-ply paper (front) is longer, which absorbs more heat from the heat source. However, the difference was extremely small.

[0065] Figure 18 shows the distribution of nicotine generation for each design. The shapes of nicotine generation were similar overall, and the shape showed that the range of nicotine generation decreased as the length of the 3-polymer paper (rear) became shorter. The rear part of the medium still had a low amount of nicotine generation. Figure 19 shows the amount of nicotine generation according to the medium distance for each design. As with the temperature distribution of the medium, design plan 1 shows a state where it has moved to the right more than design plans 2 and 3. From this trend, it is judged that if the length of the 3-polymer paper (rear) is increased, the medium can be heated up to the rear, so nicotine 2 and 3 can be increased. However, although the temperature of the front half of the medium may decrease slightly, this area is easy to heat and is the area where all nicotine is generated at the beginning of smoking, so it is assumed that there is no problem with the total emission of nicotine.

[0066] Figure 20 shows the total nicotine emission for each design. The Max.yield on the left indicates the amount of nicotine that can be generated in the tobacco medium. Designs 2 and 3 have a shorter length of the 3-polymer paper (rear) than design 1, so the temperature at the rear of the medium is lower, and therefore the amount of nicotine generated is also reduced by 2.4 to 3.1%p. Considering the composition, it can be seen that there was no difference in nicotine 1 at a total of 99.9%, but nicotine 2 and 3 were reduced. Design 3 has a shorter length of the 3-polymer paper (front) than design 2, so the overall temperature of the medium was slightly lower. From the results, the nicotine also showed a slightly lower shape than design 2, but the difference was not large. Therefore, as a result of computer interpretation of the designs, design 1 is considered to be the optimal condition in terms of nicotine generation.

[0067] 3.3.Interpretation results based on drilling position In the computerized interpretation of the perforation positions, we identified the three conditions (a), (e), and (a+e), as well as the effect of adding (f) on the medium temperature and nicotine discharge. Figure 21 shows the change in medium temperature over time for each perforation position. Since the temperature pattern changes due to changes in the design plan, making it difficult to derive correlations, we attempted to understand the function of each perforation through the temperature distribution inside the medium.

[0068] Figure 22 shows the temperature distribution of the tobacco medium for each perforation position. As can be seen from the previous results, perforation (a) cools the front of the medium and at the same time diffuses heat to the rear. Perforation (e) cools the rear of the medium but has no effect on heat diffusion. (a+e) shows the effects of (a) and (e) but is closer to (e). Figure 23 shows the air flow rate flowing into each perforation according to the interpretation conditions. For example, in the (a+e) condition, the areas of perforations (a) and (e) are the same, but the flow rate is not halved. Since the tobacco medium is a flow resistor, it is more difficult to suck in air the farther it is from the tobacco mouth (acetate filter). Therefore, in the (a+e+f) condition, the air flow rate entering each perforation is shown in the order of (f), (e), and (a). In particular, when perforation (a) is used with other perforations, the flow rate entering perforation (a) is extremely small. Therefore, in terms of temperature distribution in the medium, (a+e) is similar to (e), and (a+e+f) and (e+f) are similar to each other.

[0069] Figure 24 shows the change in medium temperature when perforation (f) is used together with other perforations. Perforation (f) is located in the tube filter, not in the tobacco medium, so its effect cannot be said to be direct. However, when perforation (f) is used together with perforations (a) or (e), the air inflow is reduced. Therefore, it has the effect of mitigating the function of each perforation. When perforation (f) is used together with (a), the temperature of the front of the medium increases and the temperature of the rear decreases. This is due to the mitigation of the cooling and heat diffusion effect of (a). When used together with perforation (e), it mitigates the cooling effect of the rear of the medium, and when used together with (a+e), it mitigates all of the effects of (a) and (e).

[0070] Figure 25 shows the distribution of nicotine generation for each perforation position condition. When condition (a) is excluded, it is confirmed that the nicotine generation in the rear of all media is greatly reduced. Therefore, perforation (a) is the most important in terms of nicotine, and when used together with other perforations, the flow rate of perforation (a) is reduced, which reduces nicotine generation in the rear of the media.

[0071] Figure 26 shows the amount of nicotine generated as a function of the distance from the medium. Under all conditions, nicotine was completely generated up to 30 mm from the front of the medium, and then the amount generated gradually decreased as the distance increased. When perforation (e) was used, nicotine generation significantly decreased from 60 mm onwards. Among the conditions, in the case of (a+f), the amount of nicotine generated from 40 to 75 mm was higher than in (a), but this is because the flow rate into (a) was low, which caused heat to diffuse to the middle part of the medium. However, as with the other conditions, the amount of nicotine generated at the rear of the medium was lower than in condition (a).

[0072] Figure 27 shows the amount of nicotine discharged for each perforation position condition. The discharge was highest under the perforation condition, and decreased by 9.2%p when (e) was used. The (a+e) condition was between (a) and (e), but was closer to (e). When (f) was added to each condition, the high nicotine discharge of (a) was lowered, and the low discharge of (e) and (a+e) was increased. This was consistent with the tendency of temperature distribution inside the medium. Therefore, it was confirmed that (a) was the optimal condition in terms of the total amount of nicotine discharge, and that using perforations of (e) or (f) together had a negative effect.

[0073] 4.Final conclusion [Conclusions of the combustible cigarette design review] In this embodiment, a computational analysis including flow and heat transfer is performed on the 3D model of the cigarette, and the amount of nicotine released is predicted based on the temperature distribution of the cigarette medium. The main conclusions are as follows:

[0074] The temperature of the tobacco medium was higher with the area of ​​the 3-polymer paper (rear), and the amount of nicotine produced also increased. When the perforations are located near the barrier (position (a) in the interpretation condition), they cool the front of the medium, but they also diffuse heat to the rear, which is beneficial for nicotine production.

[0075] 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 having ordinary skill 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 replaced or substituted by other components or equivalents to achieve appropriate results.

[0076] Accordingly, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims. [Explanation of symbols]

[0077] 100: Thermally conductive wrapper 101: First insulation layer, second insulation layer 102: Metal layer 103: Cigarette Paper 200: Carbon heat source 300: Barrier 400: Medium 500: Final skin 600: Tube filter 700: 1st fluid 800:Second fluid 900: Acetate filter 1000:Paper tube 100a: Front length 100b: rear length 103a: Length of cigarette paper 200a: Length of heat source 10: Perforation

Claims

1. A carbon heat source application cigarette, The carbon heat source-applied cigarette includes a carbon heat source, a medium, a heat conductive wrapper enclosing the carbon heat source and a portion of the medium, and a cigarette paper enclosing the remainder of the medium; a skin that encases the thermally conductive wrapper and all of the components except the thermally conductive wrapper; A barrier is formed between the carbon heat source and a medium, the thermally conductive wrapper is a tri-layer paper including a first insulating layer, a metal layer, and a second insulating layer; The carbon heat source-applied tobacco has perforations formed on the outer peripheral surface of the medium part, The perforations are formed at a position between 0.5 mm and 3 mm from the barrier. Carbon heat source applied to tobacco.

2. 2. The tobacco with a carbon heat source according to claim 1, wherein in the thermally conductive wrapper, the ratio of the length of the front portion enclosing the carbon heat source to the length of the rear portion enclosing the medium is 1:1.1 to 3.

3. The cigarette according to claim 2 , wherein the length of the rear portion is longer than the length of the front portion.

4. 2. The cigarette with a carbon heat source according to claim 1, wherein the first and second insulating layers are made of paper, and the metal layer is made of aluminum.

5. 2. The carbon heat source-applied cigarette according to claim 1, wherein the carbon heat source has a length of 5 mm to 15 mm, and the tobacco paper has a length of 3 mm to 8 mm.

6. The carbon heat source cigarette of claim 1 , wherein the barrier has a thickness of 0.1 mm to 0.3 mm.

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