Tobacco product and aerosol generating device

Abstract

A tobacco article includes an aerosol-generating substrate, a mouthpiece, and wrapping paper. Wherein the wrapping paper surrounds at least a part of the aerosol-generating substrate, the unit area normal heat-conducting thermal resistance theta of the wrapping paper is less than or equal to 0.9 * 10 <-3 > m < 2 > k / w, the unit area normal heat-conducting thermal resistance # imgabs0 #, L is the thickness of the wrapping paper, lambda is the normal heat conductivity of the wrapping paper, the wrapping paper has tightness D, the tightness D * the normal heat conductivity lambda is alpha, alpha is greater than or equal to 40 kg.w / m < 4 > k, the normal direction is the thickness direction of the wrapping paper, the invention further provides an aerosol generating device, the aerosol generating device comprises a heater, a power supply part and a controller, and the heater is used for heating at least one part of the tobacco product; the power supply supplies power to the heater; the controller controls power supplied to the power supply. The wrapping paper obtained by the scheme can have a better heat conduction effect, so that the tobacco product can obtain an ideal fuming amount, and the production cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of heated tobacco products, and particularly relates to a tobacco product with specific heat conduction performance and an aerosol generating device for heating the tobacco product. Background Art

[0002] In recent years, heated tobacco products have attracted the attention of a large number of tobacco consumers and have rapidly emerged globally, driving a huge change in the global tobacco pattern. Heated tobacco products are a new type of tobacco product. Due to the characteristic of not requiring combustion, the harmful chemical substances generated by their aerosols are greatly reduced compared to traditional cigarettes. The wrapper of a heated tobacco product can conduct heat to the tobacco material during use and directly affect the sensory quality of the smoke. Therefore, heat conduction performance plays an important role in heated tobacco products.

[0003] However, currently, heated tobacco products mainly have problems such as small smoke volume, high flue gas temperature, and uneven heat transfer. The main reasons include: the heating temperature of heated tobacco products is lower than that of traditional cigarettes, the moisture content of the flue gas is high, and the perceived temperature is higher than that of traditional cigarette flue gas; at the same time, during this heating process, affected by the wrapper of the tobacco product, its heat conduction performance is poor, the smoke volume is small, and the per-puff release amount is unstable. Therefore, a wrapper with specific heat conduction performance is extremely important for heated tobacco products.

[0004] Although the prior art has applied a metal coating or carbon-based filler on the surface of the wrapper to obtain a wrapper with better heat conduction performance, this not only increases the production cost but also poses a safety risk. For a cigarette that is discarded once used, its metal coating and carbon-based filler are also regarded as waste and discarded together, which does not conform to the green environmental protection concept. Summary of the Invention

[0005] The present invention provides a tobacco product to solve the above problems.

[0006] A tobacco product suitable for heating provided by the present invention is characterized in that the tobacco product includes an aerosol generating matrix, a mouthpiece, and a wrapper, wherein the wrapper surrounds at least a part of the aerosol generating matrix, and its normal heat conduction thermal resistance θ per unit area ≤ 0.9×10 -3 m 2 k / w, the normal heat conduction thermal resistance per unit area where L is the thickness of the wrapper, λ is the normal thermal conductivity of the wrapper, and the wrapper has a tightness D, and D×λ (tightness D times the normal thermal conductivity λ) is α, α≥40 kg·w / m 4 k, and the normal direction is the thickness direction of the wrapper.

[0007] The tobacco product obtained by the above technical solution has a good heat conduction effect, and thus can obtain an ideal smoke volume, reducing the production cost.

[0008] Optionally, the tightness D of the wrapping paper is ≥ 0.60 g / cm 3 .

[0009] Optionally, the tightness D of the wrapping paper is 0.700 - 1.500 g / cm 3 .

[0010] Optionally, the thickness L of the wrapping paper is 30 - 70 um.

[0011] Optionally, the normal heat conduction resistance θ per unit area of the wrapping paper is 0.1×10 -3 ~0.7×10 -3 m 2 k / w, and α is 70 - 450 kg·w / m 4 k.

[0012] Optionally, the wrapping paper is composed of papermaking raw materials and fillers. Among them, the papermaking raw materials include softwood pulp, hardwood pulp and hemp pulp, and the filler is calcium carbonate.

[0013] Optionally, the wrapping paper is obtained by calendering the base paper used for wrapping the tobacco product.

[0014] Optionally, the calendering process is a soft roll calendering process.

[0015] Optionally, the wrapping paper is obtained by calendering the base paper at least once.

[0016] Optionally, the wrapping paper is suitable for calendering in the nip composed of a steel roll and a rubber roll.

[0017] Optionally, the calendering temperature of the wrapping paper during calendering is ≤ 80 °C.

[0018] Optionally, the calendering speed of the wrapping paper during calendering is 30 - 100 m / min.

[0019] Optionally, the calendering pressure of the wrapping paper during calendering is 60 - 80 kg / m 2 .

[0020] Optionally, the thickness of the base paper is 50 - 90 um.

[0021] Optionally, the roundness R of the tobacco product is 0.01 - 0.50 mm.

[0022] Optionally, the aerosol - generating substrate includes at least one aerosol - forming agent, and the amount thereof is between 5 weight percent and 35 weight percent of the aerosol - generating substrate.

[0023] Optionally, the present application also provides an aerosol generating device, comprising a heater, a power supply and a controller, wherein the heater is configured to heat at least a portion of the above-mentioned tobacco product; the power supply is configured to supply power to the heater; and the controller is configured to control the power supplied by the power supply.

[0024] The above technical solution makes the tobacco product have good heat conduction effect and improves the user's smoking experience. DETAILED DESCRIPTION

[0025] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0026] In order to improve the thermal conductivity of the wrapping paper, the existing technology applies a metal coating or a carbon filler on the surface of the wrapping paper, and uses the good thermal conductivity of the metal and carbon fillers (such as graphite) to improve the thermal conductivity of the wrapping paper, thereby obtaining a wrapping paper with good thermal conductivity. This method not only increases the production cost, but also poses a safety hazard and affects the appearance of the cigarette.

[0027] The inventors of the present application have found through research that the thermal conductivity of the wrapping paper is affected by multiple comprehensive factors such as thermal conductivity and thickness. In particular, without adding carbon-containing or metal-based thermal conductive materials, the inventors have established a ratio relationship between the thickness of the wrapping paper and the thermal conductivity, and also stipulated that the product of the tightness of the wrapping paper and the thermal conductivity must be set within a limited range. The wrapping paper thus obtained can have a better thermal conductivity effect, thereby obtaining an ideal smoke yield.

[0028] The normal thermal resistance per unit area of ​​the wrapping paper of the present application is represented by θ, and satisfies θ≤0.9×10 -3 m 2 k / w, normal thermal resistance per unit area Where L is the thickness of the wrapping paper, λ is the normal thermal conductivity of the wrapping paper. And the wrapping paper has a tightness D, tightness D × normal thermal conductivity λ is represented by α, satisfying α≥40kg·w / m 4k. Wherein, the normal direction refers to the thickness direction of the wrapping paper. The thermal resistance calculated in this application is the thermal resistance in the normal direction, and the thermal conductivity is also the thermal conductivity in the defined normal direction. The tightness refers to the relationship between the grammage and the thickness of the paper (i.e., tightness = grammage / thickness, and the grammage is the mass of the wrapping paper per unit area). This application not only limits the thermal resistance per unit area of the wrapping paper θ ≤ 0.9×10 -3 m 2 k / W, but also requires that the value α of the tightness D of the wrapping paper × the normal thermal conductivity λ ≥ 40 kg·W / m 4 k. The thermal conductivity of the wrapping paper in this application is comprehensively affected by the thickness of the wrapping paper, the normal thermal conductivity, and the tightness.

[0029] Furthermore, the tightness of the wrapping paper is set to D ≥ 0.60 g / cm 3 , and the rationality of the tightness of the wrapping paper has an obvious effect on improving the tensile strength of the wrapping paper and the density of the paper structure. A reasonable tightness of the wrapping paper not only benefits the appearance of the cigarette rod surface but also has a good improvement effect on the heat conduction effect of the tobacco product. Since there is a certain linear relationship between the tightness and the thermal conductivity, increasing the tightness will also increase the thermal conductivity. In addition, keeping the tightness of the wrapping paper within a reasonable range also helps to achieve the synergistic effect of aerosol atomization and cooling. Preferably, the tightness D of the wrapping paper is 0.700 - 1.500 g / cm 3 .

[0030] Furthermore, in the above embodiments, the thickness L of the wrapping paper is set to 30 - 70 μm. According to the normal thermal resistance per unit area (where L is the thickness of the wrapping paper, λ is the normal thermal conductivity of the wrapping paper, and the normal direction is the thickness direction of the wrapping paper), it can be seen that when the normal thermal conductivity of the wrapping paper remains unchanged, the thermal resistance per unit area is proportional to the thickness of the wrapping paper. The smaller the thickness, the smaller the thermal resistance per unit area. However, for the wrapping paper used to wrap tobacco products, if the thickness is too small, it is not conducive to forming a cigarette by wrapping the tobacco column, and the formed cigarette structure is also unstable, which reduces the user's smoking experience on the one hand and affects the appearance of the cigarette on the other hand. Therefore, this application sets the thickness L of the wrapping paper to 30 - 70 μm, so that the thermal resistance per unit area is within a reasonable range, improving the heat conduction efficiency and the user's smoking experience. The preferred thickness is 30 - 60 μm.

[0031] Furthermore, in the above embodiments, the normal thermal resistance per unit area θ of the wrapping paper is 0.1×10 -3 ~0.7×10 -3 m 2 k / W, and the tightness D × the normal thermal conductivity λ is α, and α is 70 - 450 kg·W / m 4k. Through detection, it is found that excellent thermal conductivity can be obtained when the normal thermal resistance θ and the tightness D × normal thermal conductivity λ are within the above ranges, and the flue gas volume is relatively appropriate.

[0032] Furthermore, in the above embodiments, the tobacco product wrapping paper is composed of papermaking raw materials and fillers. Among them, the papermaking raw materials are the primary materials used for papermaking, including softwood pulp, hardwood pulp, and hemp pulp, and the filler is calcium carbonate. The wrapping paper made of wood pulp has better air permeability than that made of straw pulp. Hemp pulp helps to improve the tightness of the wrapping paper. As a filler for heat-not-burn cigarette paper or base paper for papermaking, calcium carbonate can not only improve the quality and performance of the paper but also increase the thickness and strength of the paper. The wrapping paper of the present application does not add metal or carbon-based fillers to enhance its thermal conductivity, reducing production costs and simplifying the process flow of manufacturing wrapping paper with good thermal conductivity.

[0033] Furthermore, in the above embodiments, the wrapping paper is obtained by a calendering process on the base paper used for wrapping tobacco products. The base paper is the rolling paper for rolling tobacco products. Through the calendering process, the self-performance of the base paper can be changed, so that the finally formed wrapping paper has a thermal resistance of 0.9×10 -3 m 2 k / w or less, and the tightness D × normal thermal conductivity λ satisfies 40 kg·w / m 4 k or more.

[0034] The calender can evenly distribute the pressure to each part of the wrapping paper, making the thickness of the wrapping paper more uniform. Through the calendering technology, while keeping the grammage unchanged, by adjusting the line pressure of the calender, the process parameters of the roll surface grinding, the accuracy of the doctor blade, and the roll temperature, the thickness of the wrapping paper can be reduced and the tightness can be increased, thereby changing the tightness and thermal resistance of the wrapping paper and obtaining good smoothness and gloss. The present application does not need to apply a metal coating or other methods to the base paper, but adopts the calendering process to use calendering to change the inherent performance parameters of the wrapping paper itself, thereby improving the thermal conductivity of the wrapping paper.

[0035] Furthermore, in the above embodiments, the calendering process is preferably a soft roll calendering process. The calendering processes include super calendering, soft roll calendering, gloss calendering, and brush grinding and polishing. Soft roll calendering is a calender unit composed of a hard roll and a soft roll. Under the set pressure, the flatness and smoothness of the paper surface are modified by using the nip formed by the smooth hot hard roll and the elastic roll to improve the performance of the paper. The present application contemplates using soft calendering for cigarette paper to improve the thermal conductivity of the wrapping paper. The present application uses the nip formed by the smooth steel roll and the rubber roll to modify the wrapping paper. Through soft roll calendering, while keeping the grammage unchanged, the tightness and thermal resistance of the wrapping paper are changed to meet the process requirements.

[0036] Further, in the above embodiments, the wrapping paper is obtained by calendering the base paper at least once. The inventor found through experiments that, while keeping the grammage constant, by setting the parameters of the calendering process, the tightness and thermal resistance of the wrapping paper can be changed. As the number of calendering increases, the tightness of the paper increases, and thus the thermal conductivity also continuously increases, while the thermal resistance per unit area continuously decreases. When the number of calendering is three, the tightness and thermal conductivity of the wrapping paper are both excellent in this case, and the heat conduction effect is better. In particular, the wrapping paper is obtained by calendering the base paper at least three times.

[0037] Further, the present application adopts a soft roll calendering process, and uses the nip formed by a steel roll and a rubber roll to calender the wrapping paper. The calendering conditions are set as calendering temperature ≤ 80°C, calendering speed of 30 - 100 m / min, and calendering pressure of 60 - 80 kg / m 2 , within this range, the tightness, thermal resistance, and thermal conductivity of the calendered wrapping paper are all within a reasonable range. Preferably, 50 ≤ calendering temperature ≤ 70°C, calendering speed of 30 - 60 m / min, and calendering pressure of 70 - 80 kg / m 2 .

[0038] Among them, when the selected base paper has a thickness of 50 - 90 μm, the lower the thickness of the base paper, the lower the thermal resistance per unit area of the wrapping paper obtained by soft roll calendering, and its thermal conductivity is better when applied to peripheral heating or internal heating. However, too low thickness is not conducive to the wrapping paper to wrap the tobacco product to form a cigarette, and the formed cigarette is unstable, affecting the appearance of the cigarette and the user's smoking experience. The inventor found through experiments that by selecting a base paper within the range of 50 - 90 μm in thickness, the thickness of the wrapping paper after soft roll calendering is more uniform. When the calendered wrapping paper is wrapped around the cigarette column to form a cigarette for smoking, the aerosol release amount per puff is more stable, making the smoke amount per puff tend to be consistent. Preferably, the thickness is 30 - 60 μm.

[0039] Further, the above base paper is calendered three times, and the grammage of the paper remains unchanged during the entire calendering process. The calendering temperature is set ≤ 80°C, the calendering speed is 30 - 100 m / min, and the calendering pressure is 60 - 80 kg / m 2 , within the above range, the thickness of the wrapping paper can be reduced, the tightness can be improved, and the obtained wrapping paper has good smoothness and gloss.

[0040] In addition, the present application provides a tobacco product, which includes an aerosol generating matrix and a filter part, wherein each part of the filter is connected in sequence and can be of an integral or segmented structure. The filter part mainly serves to reduce the release of harmful substances and lower the temperature of the aerosol. The filter part can effectively reduce the release of harmful substances such as NNK, crotonaldehyde, phenol, HCN, ammonia, and BaP. At the same time, the filter part also needs to minimize the retention of flavor substances, nicotine, and other substances. Therefore, in the design of the filter part, on the premise of harm reduction, it is necessary to fully consider ensuring the effective release of flavor substances, nicotine, and other substances. Since the tobacco product does not have a combustion property, it can greatly reduce the release of a large amount of harmful substances caused by high-temperature combustion. However, when using wrapping paper with conventional thermal conductivity, the heat conduction speed in the first few puffs is not fast enough and the resistance during the heat conduction process is large, resulting in a relatively low smoke volume, which is not suitable for externally heated tobacco products. Therefore, the present application also provides a tobacco product that is suitable for both external heating and internal heating. The tobacco product includes an aerosol generating matrix, a mouthpiece, and a wrapping paper, and the wrapping paper surrounds at least a part of the aerosol generating matrix. To ensure that the tobacco product has a good smoke effect and improve the smoking experience of consumers, the wrapping paper of the tobacco product is improved so that its physical parameters reach the required range. Therefore, the tobacco product needs to meet a certain material basis to provide an outer wrapping paper that fits well with the heating appliance and has a low thermal resistance to improve the smoking experience of consumers. A reasonable design of the tobacco product should comprehensively consider the combined effect of the aerosol generating matrix and the filter part. The aerosol generating matrix provides sufficient tobacco substances, the filter part intercepts harmful substances, reduces the temperature of the aerosol, and transfers the tobacco substances to the consumer. The wrapping paper of the tobacco product can surround all or part of the aerosol generating matrix only, or can surround the aerosol generating matrix and the mouthpiece to fix the mouthpiece to the aerosol generating matrix. The thermal resistance of the wrapping paper needs to be within a reasonable range to achieve the synergistic effect of aerosol atomization and cooling. Optionally, the materials used for the filter part include, but are not limited to, cellulose acetate tow, polypropylene tow, polylactic acid tow, paper, and polymers.

[0041] The term "aerosol generating matrix" refers to a substance that can generate or release an aerosol. The aerosol generating matrix can be a solid, paste, gel, slurry, liquid, or any combination that can include solid, paste, gel, slurry, and liquid compounds. Preferably, the aerosol generating matrix is a solid or gel composition. The aerosol generating matrix can preferably include nicotine.

[0042] The term "mouthpiece" is used herein to indicate a part of the aerosol generating product designed to come into contact with the consumer's mouth. The mouthpiece can be the part of the aerosol generating product that can include a filter, or in some cases, the mouthpiece can be defined by the scope of the tipping wrapper.

[0043] Suitable aerosol - forming agents are known in the art and include, but are not limited to: polyols such as propylene glycol, triethylene glycol, 1,3 - butanediol, glycerol; esters of polyols such as glycerol monoacetate, glycerol diacetate or glycerol triacetate; and fatty acid esters of monocarboxylic acids, dicarboxylic acids or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate.

[0044] Further, in the above - mentioned embodiments, the roundness R of the cigarette provided by the present application is ≤ 0.50 mm. The roundness of the tobacco product column can effectively control the degree of fit with the heating appliance. During suction, the tight fit between the wrapper and the heating appliance can reduce the thermal conduction resistance of the tobacco product to provide consumers with a good suction experience. The increase in the wrapper tightness will also improve the stiffness of the paper and also improve the roundness of the column to a certain extent. During the bonding process of the cigarette paper, uneven roundness will cause gaps with the appliance, resulting in uneven flue gas distribution, reduced heat conduction efficiency, visual impact in appearance, and easy damage during insertion into the heating appliance, thus causing a poor suction experience. Preferably, R ≤ 0.40 mm.

[0045] Further, the aerosol - generating matrix comprises at least one aerosol - forming agent in an amount between 5 weight - percent and 35 weight - percent of the aerosol - generating matrix.

[0046] The technical effects of the present application will be further elaborated below in conjunction with embodiments.

[0047] Example 1:

[0048] Select the uncalendered cigarette paper base paper with a thickness of 82 μm and a grammage of 59 g / m 2 , through the soft - roll calendering method, keep the grammage unchanged during the whole calendering process, set the calendering temperature at 70 °C, the calendering speed at 70 m / min, and the calendering pressure at 75 kg / m 2 , and obtain the wrapper after one - time calendering. The cigarette paper base paper can be the paper used for rolling cigarette rods. The cigarette paper base paper used in this example, as well as the following examples and comparative examples, is composed of softwood pulp, hardwood pulp, hemp pulp and calcium carbonate.

[0049] Example 2:

[0050] Select the uncalendered cigarette paper base paper with a thickness of 82 μm and a grammage of 59 g / m 2 , through the soft - roll calendering method, keep the grammage unchanged during the whole calendering process, set the calendering temperature at 70 °C, the calendering speed at 70 m / min, and the calendering pressure at 75 kg / m 2 , and obtain the wrapper after three - time calendering.

[0051] Example 3:

[0052] Select the uncalendered cigarette paper base paper with a thickness of 69 μm and a grammage of 30 g / m 2 , through the soft roll calendering method, keep the grammage unchanged during the whole calendering process, set the calendering temperature at 60 °C, the calendering speed at 80 m / min, and the calendering pressure at 70 kg / m 2 , and obtain the wrapper paper after three calenderings.

[0053] Example 4:

[0054] Select the uncalendered cigarette paper base paper with a thickness of 50 μm and a grammage of 35 g / m 2 , through the soft roll calendering method, keep the grammage unchanged during the whole calendering process, set the calendering temperature at 65 °C, the calendering speed at 50 m / min, and the calendering pressure at 80 kg / m 2 , and obtain the wrapper paper after three calenderings.

[0055] Example 5:

[0056] Select the uncalendered cigarette paper base paper with a thickness of 90 μm and a grammage of 53 g / m 2 , through the soft roll calendering method, keep the grammage unchanged during the whole calendering process, set the calendering temperature at 70 °C, the calendering speed at 70 m / min, and the calendering pressure at 80 kg / m 2 , and obtain the wrapper paper after three calenderings.

[0057] Comparative Example 1

[0058] Select the uncalendered cigarette paper base paper with a thickness of 82 μm and a grammage of 59 g / m 2 .

[0059] Comparative Example 2

[0060] Select the uncalendered cigarette paper base paper with a thickness of 58 μm and a grammage of 30.6 g / m 2 .

[0061] For the wrapper papers obtained by calendering the above Examples 1 - 5 and the uncalendered cigarette paper base papers of Comparative Examples 1 - 2, measure their thicknesses by clamping the samples in the middle of the detector with a thickness tester. According to the formula: bulk density = grammage / thickness, obtain the bulk density; through the Hotdisk thermal property tester, place the samples in a constant temperature and humidity chamber and operate under the environment of 22 °C and 60% relative humidity. Insert the samples into the module with quartz glass as the background material and put the probe in at the same time; place the external PT100 temperature measurement probe beside the samples, cover the lid to reduce the interference of the external environment, and close the constant temperature and humidity chamber to wait for the balance of temperature and humidity. Measure the normal thermal conductivity λ by the transient plane heat source method; according to the formula: normal thermal resistance per unit area Where L is the thickness of the wrapper paper, and λ is the normal thermal conductivity of the wrapper paper. The normal direction is the thickness direction of the wrapper paper. The value of the normal thermal resistance per unit area is obtained (when rolled into a cigarette, the normal direction is the normal direction of the cylindrical cigarette); calculate the value of the tightness D × the normal thermal conductivity λ, and record the values of the normal thermal resistance per unit area, the normal thermal conductivity, and the tightness data in Table 1.

[0062] Table 1 Test Results of Performance Parameters

[0063]

[0064] Application Examples 1 - 5:

[0065] Wrap the tobacco product with the wrapper paper obtained by soft calendering in the above Examples 1 - 5 to form a cigarette, where the roundness of the cigarette is 0.4 mm.

[0066] Application Example 6:

[0067] Wrap the tobacco product with the wrapper paper obtained by soft calendering in the above Example 1 to form a cigarette, where the roundness of the wrapper paper is 0.42 mm.

[0068] Application Example 7:

[0069] Take the wrapper paper obtained by soft calendering in Example 1 and wrap the tobacco product to form a cigarette, where the roundness of the cigarette is 0.51 mm.

[0070] Comparative Application Examples 1 - 2:

[0071] Wrap the tobacco products with the wrapper papers in Comparative Examples 1 - 2 respectively to form cigarettes, where the roundness of the wrapper paper is 0.5 mm.

[0072] The roundness can be measured in the following way: Place the cigarette on a special comprehensive test bench for tobacco products for roundness detection. During the test, the cigarette is fixed by a mechanical clamping device to ensure a stable state during cigarette measurement.

[0073] Place the cigarettes obtained from the above Application Examples 1-7 and Comparative Application Examples 1-2 in a heating device, and make it cooperate with the heating device to be suctioned on a smoking machine. Among them, the smoking machine performs bell-shaped wave suction, the suction scheme is the Canadian deep suction method, the suction volume is 55 mL, the appliance key time is 2.4 s, the first puff is started after an interval of 14.6 s, each puff is suctioned for 2 s, and the next puff is suctioned after an interval of 28 seconds. After the 8th puff, the collection ends, and 8 puffs are collected for each cigarette. At the same time, use a glass fiber filter cigarette smoke collector to collect the aerosol, and use gas chromatography to measure the nicotine and glycerol content of the aerosol collector. Record the total aerosol collection amount, the key substances nicotine and glycerol content in Table 2 below; then record the results of the per puff aerosol collection amount (ACM), the per puff nicotine collection amount, the total per puff collection amount SUM, and the relative standard deviation RSD (relative standard deviation RSD = standard deviation (SD) / average per puff collection amount (X)) in Table 3 below.

[0074] Table 2 Total aerosol collection amount and key substances nicotine and glycerol content

[0075]

[0076] Table 3 Comparison of per puff aerosol collection amount and per puff nicotine collection content of key substances

[0077]

[0078]

[0079] According to Tables 1-3, it can be seen that compared with Comparative Application Examples 1-2, Application Examples 1-7 have significantly improved the total aerosol collection amount and the content of key substances nicotine and glycerol. Secondly, in terms of suction, the relative standard deviation RSD of Application Examples 1-7 is smaller than that of Comparative Application Examples 1-2. The smaller the relative standard deviation RSD, the more consistent the aerosol amount per puff is, the smaller the fluctuation of the aerosol amount per puff, and the more stable and uniform the aerosol release amount per puff is in terms of suction, improving the user's suction experience.

[0080] Among them, for Application Examples 1-2 and Application Example 4, when meeting the condition that the normal thermal resistance θ of the unit area method ≤ 0.9×10 -3 m 2 k / w, and the tightness D × normal thermal conductivity λ of the wrapper paper ≥ 40 kg·w / m 4 k, further control its tightness within 0.700-1.500 g / cm 3Furthermore, the thermal resistance per unit area of the wrapping paper is further reduced, the thermal conductivity is increased, and the aerosol release rate is increased. In terms of puffing, the total aerosol release amounts of Application Examples 1-2 and Application Example 4 are higher than those of other application examples. Further, since the thickness of the cigarette paper base paper selected for Application Example 4 is between 50-90 μm, the thickness of the obtained wrapping paper is more uniform after the cigarette paper base paper in this range is soft-calendered. When the wrapping paper is wrapped around the cigarette column to form a cigarette for puffing, the aerosol release amount per unit time is relatively high, the heat conduction rate is the fastest, and the aerosol release amount per puff is also more stable. Finally, in terms of the puffing experience, Application Example 4 is superior to other application examples.

[0081] Comparing Application Example 3 with other application examples, it can be seen that the tightness of other application examples is all 0.7 g / cm 3 Above, since within a reasonable range, the higher the tightness, the greater the thermal conductivity, the thermal conductivity of the wrapping paper of other application examples is higher than that of Application Example 3. When the wrapping paper is wrapped around the cigarette column to form a cigarette for puffing, the total aerosol release amount of other application examples is higher than that of Application Example 3.

[0082] Comparing Application Example 1 with Application Examples 6-7, it can be seen that the total aerosol release amount of Application Example 1 with a roundness of 0.4 > the aerosol release amounts of Application Example 6 with a roundness of 0.42 and Application Example 7 with a roundness of 0.51. The inventor found through experiments that in addition to the tightness and thickness of the wrapping paper affecting the thermal resistance per unit area and thermal conductivity in the normal direction, and thus affecting the aerosol release amount, when the wrapping paper is wrapped around the tobacco product to form a cigarette, the roundness will also affect the final aerosol release amount. The roundness refers to the roundness of the cigarette column of the tobacco product. The smaller the roundness, the higher the degree of fit between the cigarette column and the heating appliance, and further the thermal resistance in the normal direction of the tobacco product can be reduced, and the heat conduction effect is better during peripheral or internal heating.

[0083] Comparing the total aerosol release amounts and key substance contents of Application Examples 1-2 are lower than those of Application Examples 1-7, and the relative standard deviation RSD is also higher than that of other application examples, indicating that the aerosol content released per puff is unstable and fluctuates greatly. This is because it does not simultaneously meet the requirement that the thermal resistance in the normal direction per unit area θ ≤ 0.9×10 -3 m 2 k / w, and the value α of the product of the tightness D and the thermal conductivity λ in the normal direction ≥ 40 kg·w / m 4 k. Therefore, its heat conduction effect is the worst, the aerosol release amount is unstable, and the puffing experience is reduced.

[0084] Although the present invention has been described by referring to some preferred embodiments thereof, those of ordinary skill in the art should understand that the above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A heated tobacco product, characterized in that, The tobacco product includes an aerosol - generating substrate, a mouthpiece, and a wrapper, wherein the wrapper surrounds at least a part of the aerosol - generating substrate, and the normal thermal resistance per unit area θ of the wrapper satisfies θ≤0.9×10 -3 m 2 k / w, and the normal thermal resistance per unit area where L is the thickness of the wrapper, λ is the normal thermal conductivity of the wrapper, the wrapper has a tightness D, and D×λ is α, with α≥40 kg·w / m 4 k, and the normal direction is the thickness direction of the wrapper.

2. The tobacco product according to claim 1, characterized in that, The tightness D of the wrapping paper is ≥ 0.60 g / cm 3 .

3. The tobacco product according to claim 1, characterized in that, The tightness D of the wrapping paper is 0.700 to 1.500 g / cm 3 .

4. The tobacco product according to claim 1, characterized in that, The thickness L of the wrapping paper is 30 to 70 μm.

5. The tobacco product according to claim 1, characterized in that, The normal heat conduction thermal resistance θ per unit area of the wrapping paper is 0.1×10 -3 ~0.7×10 -3 m 2 ²K / W, and α is 70~450 kg·W / m 4 ²K.

6. The tobacco product according to claim 1, characterized in that, The wrapping paper is composed of papermaking raw materials and fillers. The papermaking raw materials include softwood pulp, hardwood pulp and hemp pulp, and the filler is calcium carbonate.

7. The tobacco product according to any one of claims 1-6, characterized in that, The wrapping paper is obtained by a calendering process on the base paper used for wrapping the tobacco product.

8. The tobacco product according to claim 7, wherein, The calendering process is a soft roll calendering process.

9. The tobacco product according to claim 8, characterized in that, The wrapping paper is obtained by calendering the base paper at least once.

10. The tobacco product according to claim 9, characterized in that, The wrapping paper is suitable for being calendered in a nip formed by a steel roll and a rubber roll.

11. The tobacco product according to claim 10, characterized in that, When the wrapping paper is calendered, the calendering temperature ≤ 80 °C.

12. The tobacco product according to claim 11, characterized in that, When the wrapping paper is calendered, the calendering speed is 30 - 100 m / min.

13. The tobacco product according to claim 12, wherein, The calendering pressure of the wrapping paper during calendering is 60 - 80 kg / m 2 .

14. The tobacco product according to claim 7, wherein, The thickness of the base paper is 50 to 90 μm.

15. The tobacco product according to claim 14, characterized in that, The roundness R of the tobacco product is 0.01 to 0.50 mm.

16. The tobacco product according to any one of claims 1-6, characterized in that, The aerosol - forming substrate includes at least one aerosol - forming agent, and the amount thereof is between 5 weight - percent and 35 weight - percent of the aerosol - forming substrate.

17. An aerosol generating device, characterized in that, It includes a heater, a power supply member and a controller. The heater is configured to heat at least a part of the tobacco product according to any one of claims 1 - 6; the power supply member is configured to supply power to the heater; The controller is configured to control the power supplied to the power supply member.

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