Heating cigarette sheet as well as preparation method and application thereof

Abstract

The invention provides a heating cigarette sheet and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing tobacco powder with a filler, additional fibers, an adhesive, a smoke agent and water, and then spreading and drying to obtain a tobacco sheet base; (2) mixing the phase change temperature control material with an adhesive and water to obtain a suspension; and (3) coating the suspension liquid obtained in the step (2) at a position close to one end of the tobacco sheet base obtained in the step (1) to obtain the heated cigarette sheet. The heating cigarette sheet provided by the invention is simple in preparation process, the consistency of aerosol before and after smoking is high, and the sensory quality is good.

Description

Technical Field

[0001] The invention belongs to the technical field of heated cigarette preparation, and in particular relates to a heated cigarette sheet and a preparation method and application thereof. Background Art

[0002] With the improvement of people's health awareness and the need to ban smoking in public places, consumers' demand for low-harm cigarettes is increasing. Unlike traditional cigarette products that use high-temperature combustion, heated cigarettes use low-temperature heating technology, which will reduce harmful ingredients accordingly. Therefore, the emergence of heated cigarettes has been favored by consumers. Heated cigarettes, also known as low-temperature cigarettes, are a new type of tobacco product. The main feature is that the heating temperature is lower than 350℃. At this temperature, nicotine and other flavor components in tobacco are volatilized to produce aerosols, thus meeting the needs of smokers.

[0003] Heated cigarettes generally generate heat through electric heating elements, which heat and distill the tobacco material in the cartridge to provide smoke. The existing mainstream heating technology solutions are one of central heating technology using heating rods (sheets, needles), and the other is surrounding heating technology using cavity heating. Due to the large heat transfer area of ​​the surrounding heating technology, heat is released in a concentrated manner. The effective ingredients in the tobacco material tend to be released in the front part of the suction, causing the effective ingredients in the tobacco material to be completely distilled during the latter part of the suction process, reducing the aroma and smoke concentration, and the puff-by-puff stability, which reduces the consumer's consumption experience. In order to solve this problem, scientific and technological workers have also conducted research and reported the research results.

[0004] Patent CN202311225316.6 discloses a method for improving the stability of smoke release from heated cigarettes. The method compounds smoke-releasing particles of different bulk densities obtained by different granulation processes to regulate the bulk density of the smoke-releasing material used in the heated cigarettes. This avoids obvious sensory quality defects such as rapid smoke attenuation or slow smoke release during heating caused by particles prepared by a single process having too low or too high bulk density. The heated cigarettes have the advantages of sufficient smoke in the early stage of smoking (1 to 5 puffs), obvious no smoke attenuation in the later stage of smoking (10 to 14 puffs), consistent aroma, and prominent style characteristics. This solves the sensory problem of unstable smoke release from granular heated cigarettes currently on the market.

[0005] Patent CN202410604038.3 relates to a production process for naturally shrinking heated cigarette reconstituted tobacco leaves. The invention regulates the drying temperature of the heated cigarette slices during processing, resulting in a thickness gradient distribution of the heated cigarette slices. Under the action of surface tension, the slices naturally shrink to produce a material with a difference in thickness and density in a single direction, and are relatively uniform in another direction, so that the slices naturally shrink in a wavy shape. The heated cigarette slices have a low density after drying and expansion, and have the characteristics of fast heating rate and uniform heat transfer in the same heat flux heating regulation, which solves the problem of poor lateral heat transfer and insufficient release of effective substances in the existing slice-rolled smoking section materials, and at the same time provides technical support for improving the puff-by-puff stability of smoke.

[0006] Patent CN202410414395.3 discloses a heated cigarette capsule, a heated cigarette, and a method for manufacturing a heated cigarette capsule. The heated cigarette capsule includes: an inner core and an outer wall wrapping the inner core; the inner core uses a core material containing flavor substances; at least part of the outer wall uses a wall material with a melting point lower than the temperature of the smoke generated after heating the smoking substrate during inhalation, so that when the outer wall contacts the smoke, at least part of the outer wall melts, and the inner core releases the flavor substances from the melted position. The invention constructs part or all of the outer wall of the capsule with a material with a specified melting temperature to wrap the core material containing flavor substances. When the temperature is below the melting point, the outer wall can provide high sealing, and when the temperature is above the melting point, part or all of the outer wall will melt into liquid, allowing the contents of the core material to be released. This controlled release mechanism can ensure that the flavor is continuously released in a controlled manner over a period of time, which greatly improves the flavor uniformity of the heated cigarette puff by puff.

[0007] It can be found that solving the problem of puff-by-puff consistency of heated cigarette aerosol is a technical problem in the industry. Therefore, how to provide a method to solve the problem of concentrated heat generated by heated cigarettes around the edges, which causes a large reduction in the effective ingredients of tobacco materials in the later stage of smoking, has become an urgent problem to be solved. Summary of the invention

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a heated cigarette sheet and a preparation method and application thereof. The heated cigarette sheet provided by the present invention has a simple preparation process, high consistency before and after smoking, and good sensory quality.

[0009] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a method for preparing a heated cigarette sheet, the method comprising the following steps:

[0011] (1) mixing tobacco powder with filler, additional fiber, adhesive, smoke generating agent and water, and then spreading and drying to obtain tobacco sheet base;

[0012] (2) mixing the phase change temperature control material, a binder and water to obtain a suspension;

[0013] (3) applying the suspension obtained in step (2) to a position close to one end of the tobacco sheet base obtained in step (1) to obtain the heated cigarette sheet.

[0014] There is no order distinction between steps (1) and (2).

[0015] When a heated cigarette made of heated cigarette sheets prepared by the above method is smoked using a surrounding heating smoking device, when a large amount of heat is transferred to the sheet coated with the phase change temperature control material, the phase change temperature control material in the sheet absorbs the heat and stores the heat appropriately, so that the effective ingredients in the tobacco material of the smoking unit will not be completely released in the first half of the smoking; when the smoking reaches the second half, the tobacco material on the periphery of the sheet cylinder is completely carbonized, the thermal conductivity decreases, and the heat that continues to be transferred to the middle of the sheet cylinder decreases. At this time, the external temperature decreases, and the phase change temperature control material releases part of the heat again, so that the tobacco material in the inner circle of the sheet cylinder continues to release the effective ingredients. This avoids the problem of high aerosol concentration in the early stage and insufficient aerosol concentration in the later stage during the smoking process of heated cigarettes, improves the consistency before and after smoking, and thus improves the sensory quality, while the preparation process is simple.

[0016] Preferably, the particle size of the smoke powder in step (1) is 80-140 mesh, such as 80 mesh, 90 mesh, 100 mesh, 110 mesh, 120 mesh, 130 mesh or 140 mesh, but is not limited to the above-listed values. Other values ​​not listed within the above numerical range are also applicable.

[0017] Preferably, the filler comprises calcium carbonate and / or magnesium silicate, the smoke generating agent comprises glycerol, and the added fiber comprises wood pulp fiber and / or hemp fiber.

[0018] Preferably, in the smoke powder, the mass ratio of 80-100 mesh smoke powder to 101-140 mesh smoke powder is (5-8):(3-6), wherein the number of 80-100 mesh smoke powder can be 5, 6, 7 or 8, and the number of 101-140 mesh smoke powder can be 3, 4, 5 or 6, but are not limited to the values ​​listed above, and other values ​​not listed within the above numerical range are also applicable.

[0019] Preferably, the dynamic friction coefficient of the tobacco sheet base in step (1) is not less than 0.64.

[0020] The present invention controls the particle size of tobacco powder and its ratio so that the dynamic friction coefficient of the prepared cigarette sheet is relatively large and the surface is relatively rough. Therefore, the contact porosity of adjacent tobacco sheets is large, which is beneficial to gas flow and heat exchange, and the total release amount of the main material components of the aerosol is increased, which is beneficial to improving the overall sensory quality of the product.

[0021] Preferably, the phase change temperature control material in step (2) comprises a phase change base material and a thermally conductive filler dispersed in the phase change base material.

[0022] Preferably, the mass ratio of the phase change substrate material and the thermal conductive filler is (5-7):(3-5), for example 5:5, 5.5:4.5, 6:4, 6.5:3.5 or 7:3, etc., but is not limited to the values ​​listed above, and other values ​​not listed within the above numerical range are also applicable.

[0023] Preferably, the phase change substrate material comprises an inorganic phase change substrate material and / or an organic phase change substrate material, preferably a combination of an inorganic phase change substrate material and an organic phase change substrate material.

[0024] Preferably, the inorganic phase change substrate material includes any one of Na2CO3-BaCO3 / MgO, Na2SO4 / SiO2 or NaNO3-NaNO2 / MgO or a combination of at least two thereof, preferably Na2CO3-BaCO3 / MgO.

[0025] Preferably, the organic phase change substrate material comprises any one of erythritol, xylitol or galactitol or a combination of at least two thereof, preferably erythritol.

[0026] The above-mentioned specific phase change substrate material can improve the heat absorption and heat release effect of the product and improve the consistency before and after smoking.

[0027] Preferably, the thermally conductive filler comprises any one of boron nitride, graphene oxide, aluminum nitride, silicon carbide or metal powder, or a combination of at least two thereof, preferably a combination of boron nitride and graphene oxide.

[0028] The above-mentioned specific thermal conductive materials combined with phase change substrate materials can further effectively improve the heat absorption and heat release effects of the product and improve the consistency before and after smoking.

[0029] Preferably, the binder comprises any one of locust bean gum, guar gum or carboxymethyl cellulose, or a combination of at least two thereof.

[0030] Preferably, the mass ratio of the phase change temperature control material to the adhesive in step (2) is (93-97):(3-7), for example, 93:7, 94:6, 95:5, 96:4 or 97:3, but is not limited to the values ​​listed above. Other values ​​not listed within the above numerical range are also applicable.

[0031] Preferably, the distance between the starting position of the coating in step (3) and one end of the tobacco sheet base is 1 / 4-1 / 3 of the total length of the tobacco sheet base.

[0032] Preferably, the coating width in step (3) is πr-2πr, where r is the radius of the heated cigarette.

[0033] Preferably, the total mass of the phase change temperature control material and the adhesive in the suspension in step (3) is 6-10% of the mass of the tobacco sheet base.

[0034] In a second aspect, the present invention provides a heated cigarette sheet prepared by the preparation method described above.

[0035] In a third aspect, the present invention further provides a heated cigarette, the heated cigarette comprising a smoking unit, the smoking unit comprising a sheet cylinder formed by rolling the heated cigarette sheet as described above.

[0036] Preferably, the rolling method is specifically as follows:

[0037] The tobacco sheet base is rolled up starting from one end of the tobacco sheet base close to the coating suspension position toward the other end.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention provides a method for preparing heated cigarette sheets. When a heated cigarette is made of heated cigarette sheets and smoked using a surrounding heating smoking device, when a large amount of heat is transferred to the sheet coated with a phase change temperature control material, the phase change temperature control material in the sheet absorbs the heat and stores the heat appropriately, so that the effective components in the tobacco material of the smoking unit will not be completely released in the first stage of smoking; when the smoking is in the second half, the tobacco material on the periphery of the sheet cylinder is completely carbonized, the thermal conductivity decreases, and the heat that continues to be transferred to the middle of the sheet cylinder decreases. At this time, the external temperature decreases, and the phase change temperature control material releases part of the heat again, so that the tobacco material in the inner circle of the sheet cylinder continues to release the effective components. This avoids the problem of high aerosol concentration in the early stage and insufficient aerosol concentration in the later stage during the smoking of hot cigarettes, improves the consistency before and after smoking, and thus improves the sensory quality, while the preparation process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the position of the suspension coated on the tobacco sheet substrate in Examples 1-3. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0042] Example 1

[0043] This embodiment provides a heated cigarette sheet, and the preparation method is as follows:

[0044] (1) A sheet base is prepared by using a thick slurry method tobacco sheet production process: the tobacco material is crushed to obtain tobacco powder of a certain particle size; 20% of the tobacco powder (the mass ratio of 80-100 mesh tobacco powder to 101-140 mesh tobacco powder is 7:4) is mixed with 0.75% of wood pulp fiber, 1% of locust bean gum, 4% of glycerin and the remainder of water, and stirred evenly to form a slurry; the stirred slurry is evenly spread and then dried to evaporate the water in the slurry to form a tobacco sheet base (dynamic friction coefficient 0.965).

[0045] (2) Mixing a phase change temperature control material (including a phase change base material and a thermal conductive filler in a mass ratio of 1:1, the phase change base material including Na2CO3-BaCO3 / MgO and erythritol in a mass ratio of 3:7, and the thermal conductive filler including boron nitride and graphene oxide in a mass ratio of 4.5:5.5) with a binder (locust bean gum) and water, wherein the mass ratio of the phase change temperature control material to the binder is 94:6, to obtain a suspension.

[0046] (3) Preparation of a 7.2 mm diameter thin sheet cylinder (the length of the spread thin sheet is 128 mm): The suspension is coated on a tobacco thin sheet base (the total mass of the phase change temperature control material and the adhesive is 8% of the mass of the tobacco thin sheet base), such as Figure 1 As shown, the coating width is 22.6 mm, and the coating starting position is closer to the B end, with a distance of 35 mm. The heated cigarette sheet is then dried to obtain the heated cigarette sheet, which is rolled from the B end to the A end to obtain a sheet cylinder.

[0047] Example 2

[0048] This embodiment provides a heated cigarette sheet, and the preparation method is as follows:

[0049] (1) A sheet base is prepared by using a thick slurry method tobacco sheet production process: the tobacco material is crushed to obtain tobacco powder of a certain particle size; 20% of the tobacco powder (the mass ratio of 80-100 mesh tobacco powder to 101-140 mesh tobacco powder is 5:3) is mixed with 0.75% of hemp fiber, 1% of guar gum, 4% of glycerol and the remainder of water, and stirred evenly to form a slurry; the stirred slurry is evenly spread and then dried to evaporate the water in the slurry to form a tobacco sheet base (dynamic friction coefficient 0.882).

[0050] (2) Mixing a phase change temperature control material (including a phase change base material and a thermal conductive filler in a mass ratio of 3:2, the phase change base material including Na2CO3-BaCO3 / MgO and erythritol in a mass ratio of 2:8, and the thermal conductive filler including boron nitride and graphene oxide in a mass ratio of 4:6) with a binder (locust bean gum) and water, wherein the mass ratio of the phase change temperature control material to the binder is 93:7, to obtain a suspension.

[0051] (3) Preparation of a 7.2 mm diameter thin sheet cylinder (the length of the spread thin sheet is 128 mm): The suspension is coated on a tobacco thin sheet base (the total mass of the phase change temperature control material and the adhesive is 6% of the mass of the tobacco thin sheet base), such as Figure 1 As shown, the coating width is 11.5 mm, and the coating starting position is closer to the B end, with a distance of 42 mm. The heated cigarette sheet is then dried to obtain the heated cigarette sheet, which is rolled from the B end to the A end to obtain a sheet cylinder.

[0052] Example 3

[0053] This embodiment provides a heated cigarette sheet, and the preparation method is as follows:

[0054] (1) A sheet base is prepared by using a thick slurry method tobacco sheet production process: the tobacco material is crushed to obtain tobacco powder of a certain particle size; 20% of the tobacco powder (the mass ratio of 80-100 mesh tobacco powder to 101-140 mesh tobacco powder is 8:6) is mixed with 0.75% of wood pulp fiber, 1% of guar gum, 4% of glycerol and the remainder of water, and stirred evenly to form a slurry; the stirred slurry is evenly spread and then dried to evaporate the water in the slurry to form a tobacco sheet base (dynamic friction coefficient 0.695).

[0055] (2) Mixing a phase change temperature control material (including a phase change base material and a thermal conductive filler, the mass ratio of the two is 7:3, the phase change base material includes Na2CO3-BaCO3 / MgO and erythritol, the mass ratio is 4:6, and the thermal conductive filler includes boron nitride and graphene oxide, the mass ratio is 5:5) with a binder (locust bean gum) and water, the mass ratio of the phase change temperature control material to the binder is 97:3, and a suspension is obtained.

[0056] (3) Preparation of a 7.2 mm diameter thin sheet cylinder (the length of the spread thin sheet is 128 mm): The suspension is coated on a tobacco thin sheet substrate (the total mass of the phase change temperature control material and the adhesive is 10% of the mass of the tobacco thin sheet substrate), such as Figure 1 As shown, the coating width is 18.5 mm, and the coating starting position is closer to the B end, with a distance of 38 mm. The heated cigarette sheet is then dried to obtain the heated cigarette sheet, which is rolled from the B end to the A end to obtain a sheet cylinder.

[0057] Example 4

[0058] This embodiment provides a heated cigarette sheet. The preparation method is consistent with that of Embodiment 1 except that the mass ratio of 80-100 mesh tobacco powder to 101-140 mesh tobacco powder is controlled to be 4:7 and the dynamic friction coefficient of the tobacco sheet base is set to 0.472.

[0059] Example 5

[0060] This embodiment provides a heated cigarette sheet, and the preparation method is consistent with that of embodiment 1 except that Na2CO3-BaCO3 / MgO is not included and a reduced portion is allocated to erythritol.

[0061] Example 6

[0062] This embodiment provides a heated cigarette sheet, and the preparation method is consistent with that of embodiment 1 except that erythritol is not included and a reduced portion is allocated to Na2CO3-BaCO3 / MgO.

[0063] Example 7

[0064] This embodiment provides a heated cigarette sheet. The preparation method is the same as that of Embodiment 1 except that Na2CO3-BaCO3 / MgO is replaced by an equal amount of Na2SO4 / SiO2.

[0065] Example 8

[0066] This embodiment provides a heated cigarette sheet, and the preparation method is consistent with that of Embodiment 1 except that erythritol is replaced by an equal amount of xylitol.

[0067] Example 9

[0068] This embodiment provides a heated cigarette sheet, and the preparation method is consistent with that of Embodiment 1 except that boron nitride is not included and a reduced portion is allocated to graphene oxide.

[0069] Example 10

[0070] This embodiment provides a heated cigarette sheet, and the preparation method is consistent with that of Embodiment 1 except that graphene oxide is not included and a reduced portion is allocated to boron nitride.

[0071] Application Example 1

[0072] This application example provides a heated cigarette, including a smoking unit, a cooling unit and a filter unit. The three units are connected by coaxial wrapping of external cigarette paper, and the cooling unit is located between the smoking unit and the filter unit. The smoking unit is a thin cylinder prepared from the heated cigarette sheet provided in Example 1. The total length of the cigarette is 45mm and the diameter is 7.2mm. The smoking unit is 12mm long; the cooling unit is a hollow structure with a hole diameter of 3.7mm, and the outer material is formed by 72% diacetate cellulose tow with 18% triacetin, and the length is 23mm; the filter unit is made of 93% diacetate cellulose tow with 7% triacetin, 10mm.

[0073] Application Example 2-10

[0074] Application Examples 2-10 respectively provide a heated cigarette, and the structure is consistent with Application Example 1 except that the thin sheet cylinders prepared by the heated cigarette sheets provided in Example 1 are replaced by the thin sheet cylinders prepared by the heated cigarette sheets provided in Examples 2-10.

[0075] Comparative application example 1

[0076] This comparative application example provides a heated cigarette, the structure of which is consistent with that of Application Example 1 except that the thin sheet cylinder prepared by the heated cigarette thin sheet provided in Example 1 is replaced by the thin sheet cylinder (diameter 7.2 mm) rolled from the tobacco thin sheet base in step (1) of Example 1.

[0077] Effect test:

[0078] The smoking consistency test was performed on the heated cigarettes provided in Example 1-10 and Comparative Application Example 1. The test method is as follows:

[0079] (1) Materials and instruments

[0080] Materials: smoking utensils; different heated cigarettes; 44mm Cambridge filter.

[0081] Instruments: RM20H turntable smoking machine (equipped with a puff-by-puff module, Borgwaldt, Germany); 7AL204 electronic balance (sensitivity 0.0001 g, Mettler Toledo, Switzerland).

[0082] (2) Test plan

[0083] Smoking parameters: The 11 heated cigarette samples were equilibrated at a temperature of 22°C ± 1°C and a relative humidity of 60% ± 3% for 48 h, and the cigarettes were smoked according to the Canadian deep smoking mode, i.e., the puffing volume was 55.0 mL, the puffing time was 2 s, the puffing frequency was 30 s, and the puffing curve was bell-shaped.

[0084] Analysis of the puff-by-puff ACM (aerosol capture volume) of heated cigarette aerosol: randomly select balanced cigarette samples and smoke them in the RM20H rotary smoking machine using the same smoking utensils according to the above smoking parameters. Each puff of aerosol from every 16 cigarettes is captured on a 44mm Cambridge filter. After the puff is finished, the difference in the mass of the collector before and after the puff is calculated to obtain the aerosol puff-by-puff ACM value.

[0085] (3) Evaluation of the consistency of heated cigarettes before and after

[0086] The stability of heated cigarette aerosol should be based on ensuring the total aerosol release, taking into account the overall discreteness of the data and the consistency of the adjacent puff sequence data. Based on these two dimensions, the puff-by-puff stability index of heated cigarettes is calculated according to the method introduced in the literature to evaluate the puff-by-puff stability. According to the literature, the relative standard deviation method (RSD) is selected to evaluate the overall discreteness of the puff-by-puff release data, and the relative mean moving range method (RMR) is selected to evaluate the consistency of the adjacent puff sequence release. Therefore, the puff-by-puff stability of heated cigarette aerosol can be expressed by a two-dimensional vector Indicates that Specifically expressed as: (RSD, RMR).

[0087] The better the overall discreteness of the puff-by-puff release data, that is, the smaller the RSD of the horizontal coordinate, the closer the vector is to the vertical coordinate axis; the smaller the difference in the release data of adjacent puffs, that is, the smaller the RMR of the vertical coordinate, the closer the vector is to the horizontal coordinate axis; when both RSD and RMR are very small, the vector is closer to the origin. Calculate the modulus of the above two-dimensional vector and define it as the stability index SI (Stability Index). The smaller the stability index value, the better the stability. The calculation formula is as follows:

[0088]

[0089] Among them, x i is the aerosol ACM release amount under the i-th puff order, is the arithmetic mean of the aerosol ACM release per puff, and n is the total number of puffs.

[0090] The results are as follows:

[0091]

[0092]

[0093] From the above results, it can be found (Application Example 1, Comparative Application Example 1) that the heated cigarette sheet provided by the present invention can effectively improve the smoking consistency of heated cigarettes; by comparing Application Examples 1, 4-10, it can be found that the present invention can effectively improve the smoking consistency and sensory quality by controlling relevant parameters and using specific preparation raw materials.

[0094] The applicant declares that the present invention uses the above-mentioned embodiments to illustrate the heated cigarette sheet and its preparation method and application, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0095] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0096] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A method for preparing heated cigarette sheets, characterized in that: The preparation method comprises the following steps: (1) mixing tobacco powder with filler, additional fiber, adhesive, smoke generating agent and water, and then spreading and drying to obtain tobacco sheet base; (2) mixing the phase change temperature control material, a binder and water to obtain a suspension; (3) applying the suspension obtained in step (2) to a position close to one end of the tobacco sheet base obtained in step (1) to obtain the heated cigarette sheet; There is no order distinction between steps (1) and (2).

2. The preparation method according to claim 1, characterized in that: The particle size of the smoke powder in step (1) is 80-140 mesh; Preferably, in the smoke powder, the mass ratio of 80-100 mesh smoke powder to 101-140 mesh smoke powder is (5-8):(3-6).

3. The preparation method according to claim 1 or 2, characterized in that: The dynamic friction coefficient of the tobacco sheet base in step (1) is not less than 0.

64.

4. The preparation method according to any one of claims 1 to 3, characterized in that The phase change temperature control material in step (2) comprises a phase change base material and a thermal conductive filler dispersed in the phase change base material; Preferably, the mass ratio of the phase change substrate material to the thermal conductive filler is (5-7):(3-5).

5. The preparation method according to claim 4, characterized in that: The phase change substrate material comprises an inorganic phase change substrate material and / or an organic phase change substrate material, preferably a combination of an inorganic phase change substrate material and an organic phase change substrate material; Preferably, the inorganic phase change substrate material comprises any one or a combination of at least two of Na2CO3-BaCO3 / MgO, Na2SO4 / SiO2 or NaNO3-NaNO2 / MgO, preferably Na2CO3-BaCO3 / MgO; Preferably, the organic phase change substrate material comprises any one of erythritol, xylitol or galactitol or a combination of at least two thereof, preferably erythritol.

6. The preparation method according to claim 4 or 5, characterized in that: The thermally conductive filler includes any one of boron nitride, graphene oxide, aluminum nitride, silicon carbide or metal powder, or a combination of at least two of them, preferably a combination of boron nitride and graphene oxide.

7. The preparation method according to any one of claims 1 to 6, characterized in that: The binder comprises any one or a combination of at least two of locust bean gum, guar gum or carboxymethyl cellulose; Preferably, the mass ratio of the phase change temperature control material to the adhesive in step (2) is (93-97):(3-7); Preferably, the distance between the starting position of the coating in step (3) and one end of the tobacco sheet substrate adjacent thereto is 1 / 4-1 / 3 of the total length of the tobacco sheet substrate; Preferably, the coating width in step (3) is πr-2πr, where r is the radius of the heated cigarette.

8. A heated cigarette sheet prepared by the preparation method according to any one of claims 1 to 7.

9. A heated cigarette, characterized in that: The heated cigarette comprises a smoking unit, and the smoking unit comprises a sheet cylinder formed by rolling the heated cigarette sheet according to claim 8.

10. The heated cigarette according to claim 9, characterized in that: The rolling method is specifically as follows: The tobacco sheet base is rolled up starting from one end of the tobacco sheet base close to the coating suspension position toward the other end.

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