Heated cigarette composite paper suitable for internal and external coupling heating and its preparation method, heated cigarette

Abstract

This invention relates to heated cigarette composite paper suitable for internal and external coupled heating, its preparation method, and heated cigarettes, belonging to the field of heated cigarette technology. The heated cigarette composite paper of this invention has flame-retardant and heat-conducting functions in its first and second cigarette paper layers, which can meet the requirements of simultaneous or stepwise heating of the first and second cigarette paper layers by the internal and external heating elements in a cigarette electric heating device with internal and external coupled heating function. The coating layer slowly releases nicotine and flavor substances when heated, and these substances are released to the heated cigarette core through the second cigarette paper layer, improving the release stability of the aerosol in each puff of the heated cigarette. The heated cigarette composite paper of this invention has the function of regulating the release level and rate of nicotine and flavor components, allowing for precise control of the puff-by-puff release of nicotine and flavor substances, effectively improving the release stability of the aerosol in each puff of the heated cigarette.

Description

Technical Field

[0001] This invention relates to heated cigarette composite paper suitable for internal and external coupling heating, its preparation method, and heated cigarettes, belonging to the field of heated cigarette technology. Background Technology

[0002] Heated cigarettes directly heat the cigarette core material through internal or external heating to generate an aerosol for the consumer to inhale. Their advantages include a better sensory quality of the atomized aerosol, closely resembling that of traditional cigarettes, and a more complete aroma. Currently, most heated cigarettes use a single heating method for the cigarette core material, either internal or external heating. When heating a heated cigarette internally, the core material is heated from the inside out, with the heated area gradually expanding, thus continuously releasing tobacco components. Under internal heating, a significant radial temperature gradient exists between the inside and outside of the core material, meaning the internal temperature is significantly higher than the external temperature, resulting in insufficient release of tobacco components from the external core material. While raising the internal temperature to increase the external temperature can improve the release of tobacco components from the external core material, excessively high internal temperatures can increase the "burnt" taste of the core material. Therefore, in the internal heating method, the internal tobacco core material is heated to a higher temperature in the early stages of heating, resulting in a high release of tobacco components. However, in the later stages of heating, the tobacco components in the internal tobacco core material are almost completely released, while the temperature of the external tobacco core material is lower, leading to a lower release of tobacco components. This results in a difference in the release of tobacco components before and after heating the cigarette, causing instability in the puff-by-puff aerosol release of the heated cigarette. When heating cigarettes externally, the tobacco core material is heated from the outside in, with heat continuously transferred inwards, causing the tobacco core material to be heated and releasing tobacco components continuously. In the external heating method, due to the circumferential radiation characteristics of external heating, the heating of the internal and external tobacco core material is basically the same, resulting in a more concentrated release of tobacco components from both the internal and external tobacco core materials. This allows for better tobacco component release in the early stages of heating the externally heated cigarette. However, because the internal and external tobacco core material are heated simultaneously, the slow-release effect of tobacco components deteriorates, leading to insufficient release of tobacco components in the later stages of heating. This also results in a difference in the release of tobacco components before and after heating the cigarette, causing instability in the puff-by-puff aerosol release of the heated cigarette.

[0003] Internal and external coupling heating, by matching and coupling the heating time, sequence, and power of internal and external heating, controls the dynamic increase of the heated area of ​​the cigarette, thereby improving the stability of the cigarette's puff-by-puff release. Specifically applied to heated cigarettes, internal and external coupling heating can dynamically adjust the increase of the heated area, allowing the internal and external heating of the cigarette core material to work together, achieving the goal of "slow release" of tobacco components and significantly improving the stability of the cigarette's puff-by-puff release. For example, Chinese patent document CN208143515U provides a cigarette electric heating device with replaceable heating elements. This device simultaneously provides an internal heating element and an external heating element. The internal heating element is cylindrical, and the external heating element is annular. Because both internal and external heating elements are provided, when heating cigarettes using this device, the heating method can be selected according to the actual situation, choosing between external and / or internal heating. For example, by adopting an internal-external coupling heating method that primarily uses internal heating in the early stages and external heating in the later stages, the user experience can be improved. However, current cigarette paper for heated cigarettes cannot meet the requirements of internal and external coupling heating, which makes it impossible for electric cigarette heating devices with internal and external coupling heating functions to be used effectively and smoothly. Summary of the Invention

[0004] The purpose of this invention is to provide a heated cigarette composite paper suitable for internal and external coupling heating, which can solve the problem that current heated cigarette papers cannot meet the requirements of internal and external coupling heating.

[0005] The second objective of this invention is to provide a method for preparing heated cigarette composite paper suitable for internal and external coupling heating, which can solve the problem that the cigarette paper prepared by the current method for preparing heated cigarette composite paper is not suitable for cigarette electric heating devices with internal and external coupling heating function.

[0006] The third objective of this invention is to provide a heated cigarette suitable for internal and external coupling heating, which can solve the problem of poor smoking stability of current heated cigarettes.

[0007] To achieve the above objectives, the technical solution adopted by the present invention for the heated cigarette composite paper suitable for internal and external coupling heating is as follows:

[0008] A heated cigarette composite paper suitable for internal and external coupling heating includes a first cigarette paper layer, a coating layer, and a second cigarette paper layer sequentially bonded together; the first and second cigarette paper layers include thermally conductive fillers and flame retardants, wherein the mass fraction of the thermally conductive fillers in the first and second cigarette paper layers is independently 1% to 10%, and the mass fraction of the flame retardants in the first and second cigarette paper layers is independently 1% to 10%.

[0009] The thickness of the first cigarette paper layer is greater than the thickness of the second cigarette paper layer, and the air permeability of the first cigarette paper layer is less than that of the second cigarette paper layer.

[0010] The coating layer is made of a coating liquid, which includes nicotine-based substances, glycoside compounds, fragrances, flame retardants, and solvents.

[0011] The present invention provides a heated cigarette composite paper suitable for internal and external coupled heating. The first and second cigarette paper layers have flame-retardant and heat-conducting functions, which can meet the requirements of simultaneous or stepwise heating of the first and second cigarette paper layers by the internal and external heating elements in a cigarette electric heating device with internal and external coupled heating function. When heated, the coating layer slowly releases nicotine and flavor substances, which are released to the heated cigarette core through the second cigarette paper layer, improving the release stability of the aerosol in each puff of the heated cigarette. The heated cigarette composite paper of the present invention has the function of regulating the release level and rate of nicotine and flavor components, allowing precise control of the puff-by-puff release of nicotine and flavor substances, effectively improving the release stability of the aerosol in each puff of the heated cigarette.

[0012] The first cigarette paper layer has low air permeability, which effectively reduces the absorption of external moisture by the coating layer and prevents the coating layer components from escaping, thus reducing the loss of nicotine and flavor components and increasing the shelf life of cigarettes. The second cigarette paper layer has high air permeability, which is conducive to the heat release of the coating layer components, allowing the heat-released components to effectively pass through the second cigarette paper layer and enter the core material, increasing the heat release efficiency of the coating layer components.

[0013] It is understood that when the heated cigarette composite paper of the present invention, which is suitable for internal and external coupling heating, is used to prepare heated cigarettes, the first cigarette paper layer is in direct contact with the core material (tobacco matrix).

[0014] Preferably, the mass fraction of thermally conductive filler in the first cigarette paper layer is 1-5%; and the mass fraction of thermally conductive filler in the second cigarette paper layer is 5%-10%.

[0015] Preferably, the flame retardant in the first cigarette paper layer has a mass fraction of 5% to 10%, and the flame retardant in the second cigarette paper layer has a mass fraction of 1% to 5%.

[0016] Preferably, the thickness of the first cigarette paper layer is 50–200 μm. For example, the thickness of the first cigarette paper layer is 50–100 μm. A thickness of 50–200 μm for the first cigarette paper layer can reduce the absorption of moisture from the outside by the first cigarette paper and reduce the outward diffusion loss of aroma components in the coating layer.

[0017] Preferably, the thickness of the second cigarette paper layer is 30–100 μm. For example, the thickness of the second cigarette paper layer is 30–50 μm.

[0018] To ensure that the heated cigarette prepared using the heated cigarette composite paper suitable for internal and external coupling heating of the present invention can better allow the airflow to enter the core material (tobacco matrix) through the micropores of the composite cigarette paper during heating, preferably, both the first and second cigarette paper layers are provided with micropores; the pore diameter of the micropores provided on the first cigarette paper layer is smaller than the pore diameter of the micropores provided on the second cigarette paper layer.

[0019] Preferably, the pore size of the micropores provided on the first cigarette paper layer is 0.1–10 μm. For example, the pore size of the micropores provided on the first cigarette paper layer is 0.5–5 μm. The pore size of the micropores provided on the first cigarette paper layer is 0.1–10 μm, which can reduce the absorption of moisture by the first cigarette paper layer and reduce the loss of aroma components in the coating layer due to outward diffusion.

[0020] Preferably, the pore density of the micropores on the first cigarette paper layer is 500 to 5000 pores / cm². 2 For example, the pore density of the micropores on the first cigarette paper layer is 300-500 pores / cm². 2 .

[0021] Preferably, the pore size of the micropores on the second cigarette paper layer is 0.2–20 μm. For example, the pore size of the micropores on the first cigarette paper layer is 5–8 μm. The pore size of the micropores on the second cigarette paper layer is 0.2–20 μm, which can better ensure that the nicotine and flavoring in the coating layer are quickly released into the cigarette core when heated.

[0022] Preferably, the pore density of the micropores on the second cigarette paper layer is 500 to 5000 pores / cm². 2 For example, the pore density of the micropores on the second cigarette paper layer is 500-600 pores / cm². 2 .

[0023] It is understandable that the pore size and pore density of the micropores on the first cigarette paper layer and the pore size and pore density of the micropores on the second cigarette paper layer can be adjusted, but it is necessary to ensure that the air permeability of the first cigarette paper layer is less than that of the second cigarette paper layer.

[0024] Preferably, the thermally conductive fillers in the first cigarette paper layer and the second cigarette paper layer are independently selected from one or any combination of alumina powder, aluminum nitride powder, and silicon carbide powder.

[0025] Preferably, the flame retardant in the first and second cigarette paper layers is an inorganic flame retardant. Preferably, the inorganic flame retardant in the first and second cigarette paper layers is independently selected from one or any combination of dihydrogen phosphate, ammonium polyphosphate, and magnesium hydroxide.

[0026] Preferably, the first and second cigarette paper layers also independently include calcium carbonate filler. Preferably, the mass fraction of calcium carbonate filler in the first and / or second cigarette paper layers is 10% to 30%. For example, the mass fraction of calcium carbonate filler in the first cigarette paper layer is 10% to 20%, and the mass fraction of calcium carbonate filler in the second cigarette paper layer is 20% to 30%.

[0027] Preferably, the first cigarette paper layer and the second cigarette paper layer further independently include a viscosity modifier. Preferably, the viscosity modifier in the first cigarette paper layer and / or the second cigarette paper layer is selected from one or any combination of guar gum, carrageenan, and xanthan gum. Preferably, the first cigarette paper layer includes a viscosity modifier, and the viscosity modifier in the first cigarette paper layer is selected from one or any combination of guar gum, carrageenan, and xanthan gum. Preferably, the second cigarette paper layer includes a viscosity modifier, and the viscosity modifier in the second cigarette paper layer is selected from one or any combination of guar gum, carrageenan, and xanthan gum.

[0028] Preferably, the viscosity modifier in the first cigarette paper layer and / or the second cigarette paper layer has a mass fraction of 1% to 10%. Preferably, the first cigarette paper layer includes a viscosity modifier, and the mass fraction of the viscosity modifier in the first cigarette paper layer is 1% to 10%. For example, the mass fraction of the viscosity modifier in the first cigarette paper layer is 1% to 5%. Preferably, the second cigarette paper layer includes a viscosity modifier, and the mass fraction of the viscosity modifier in the second cigarette paper layer is 1% to 10%. For example, the mass fraction of the viscosity modifier in the second cigarette paper layer is 5% to 10%.

[0029] Preferably, the first cigarette paper layer and the second cigarette paper layer further include cigarette paper fibers.

[0030] Preferably, the thickness of the coating layer is 50–150 μm. For example, the thickness of the coating layer is 100 μm.

[0031] Preferably, the nicotine-like substance is nicotine and / or nicotine salts. Using nicotine salts provides a release temperature higher than that of free nicotine, and thus exhibits a sustained-release effect upon heating.

[0032] Preferably, the nicotine salt is selected from one or any combination of tartrate nicotine salt, malic nicotine salt, and benzoic acid nicotine salt.

[0033] Preferably, the glycoside compound is a glucosinolate. Glucoside compounds are characterized by low volatility at room temperature and the ability to decompose and release aroma components upon heating, thus having a slow-release effect on aroma components during heating.

[0034] Preferably, the glucosinolate compound is vanillin glucoside and / or ethyl vanillin glucoside. Vanillin glucoside and / or ethyl vanillin glucoside can undergo pyrolysis during heating, releasing vanillin and / or ethyl vanillin, which can significantly improve the sweetness of heated cigarettes and has a fixative effect.

[0035] Preferably, the flame retardant in the coating liquid is a phosphorus-based flame retardant. More preferably, the phosphorus-based flame retardant is dihydrogen phosphate and / or ammonium polyphosphate.

[0036] Preferably, the coating liquid further includes a viscosity modifier. Preferably, the viscosity modifier in the coating liquid is selected from one or any combination of guar gum, carrageenan, and xanthan gum.

[0037] In this invention, the flavoring agent is selected according to the requirements of standard YC / T 164-2012 "Flavors for Tobacco Use," and the amount of nicotine-like substances used needs to meet the requirements of standard GB 41700-2022 "Electronic Cigarettes" regarding the nicotine concentration (nicotine concentration should not exceed 20 mg / g) and total nicotine content (total nicotine content should not exceed 200 mg) in the atomized product. For example, the mass fraction of the flavoring agent in the coating liquid is 5-10%; the mass fraction of nicotine-like substances in the coating liquid is 5-10%.

[0038] It is understood that the mass fractions of glycosides and flavorings in the coating solution can be optimized according to the sensory quality requirements of heated cigarettes. For example, the mass fraction of glycosides in the coating solution may be 5-10%.

[0039] It is understood that when determining the mass fraction of the flame retardant in the coating liquid, it is necessary to ensure that the ignition point of the resulting coating layer is not lower than 400°C. For example, the mass fraction of the flame retardant in the coating liquid is 5% to 10%.

[0040] Preferably, the solvent in the coating liquid is an alcohol solvent. For example, the alcohol solvent is ethylene glycol or glycerol.

[0041] Understandably, when determining the mass fraction of the viscosity modifier in the coating solution, it is necessary to ensure that the coating solution is easy to coat and set without causing natural flow. For example, the mass fraction of the viscosity modifier in the coating solution is 5-8%.

[0042] Preferably, the coating solution further includes a tobacco extract. Preferably, the tobacco extract is used in the form of a tobacco extract paste. Preferably, the mass fraction of the tobacco extract paste in the coating solution is 5-10%.

[0043] Preferably, the tobacco extract is prepared by a method comprising the following steps: mixing tobacco powder and an extraction solvent at a temperature not lower than 60°C, then performing solid-liquid separation, and then concentrating the liquid obtained from the solid-liquid separation to obtain the concentrated liquid, which is the tobacco extract. Preferably, the mass fraction of the tobacco extract in the concentrated liquid is 10-15%. Preferably, the mixing time of the tobacco powder and the extraction solvent is not less than 4 hours. Preferably, the tobacco powder and the extraction solvent are mixed under sealed conditions. Preferably, the extraction solvent is an aqueous solution of ethanol. Preferably, the mass fraction of the aqueous solution of ethanol is not less than 70%. Preferably, the particle size of the tobacco powder is not less than 80 mesh. Preferably, the mass ratio of the tobacco powder to the extraction solvent is (8-9):(1-2).

[0044] The technical solution adopted in the preparation method of the heated cigarette composite paper suitable for internal and external coupled heating of the present invention is as follows:

[0045] A method for preparing heated cigarette composite paper suitable for internal and external coupled heating as described above includes the following steps: combining a first cigarette paper layer, a coating layer, and a second cigarette paper layer together to obtain heated cigarette composite paper suitable for internal and external coupled heating.

[0046] The present invention provides a simple method for preparing heated cigarette composite paper suitable for internal and external coupling heating. The prepared heated cigarette composite paper has the function of regulating the release level and release rate of nicotine and flavor components, and can precisely control the release of nicotine and flavor substances in each puff, effectively improving the release stability of heated cigarette aerosol in each puff.

[0047] Understandably, the method of bonding the first cigarette paper layer, the coating layer, and the second cigarette paper layer together includes the following steps: applying a coating liquid to one surface of the first cigarette paper layer to form a coating liquid layer, then bonding the second cigarette paper layer onto the coating liquid layer, drying, and the coating liquid layer forming a coating layer; or applying a coating liquid to one surface of the second cigarette paper layer to form a coating liquid layer, then bonding the first cigarette paper layer onto the coating liquid layer, drying, and the coating liquid layer forming a coating layer; or applying a coating liquid to one surface of each of the first and second cigarette paper layers to form a coating liquid layer, then bonding the coating liquid layers on the first and second cigarette paper layers together, drying, and the coating liquid layer forming a coating layer.

[0048] The technical solution adopted by the present invention for heated cigarettes suitable for internal and external coupling heating is as follows:

[0049] A heated cigarette suitable for internal and external coupling heating includes a filter rod segment and a cigarette core segment connected in sequence; the cigarette core segment includes a tobacco matrix and a cigarette paper wrapping the tobacco matrix, wherein the cigarette paper is a heated cigarette composite cigarette paper as described above.

[0050] When the heated cigarette of the present invention, which is suitable for internal and external coupling heating, is heated using the internal and external coupling heating method, the suction airflow enters through the first cigarette paper layer of the composite cigarette paper, and then comes into contact with the coating layer. When the coating layer is heated, it slowly releases nicotine and flavor substances, which are then released through the second cigarette paper layer to the core section of the heated cigarette and flow to the filter rod section through the airflow, thereby improving the release stability of the aerosol in each puff of the heated cigarette.

[0051] Preferably, the heated cigarette further includes a sealing section, which is located on the side of the cigarette core section away from the filter rod section, and the sealing section has a coaxial hollow through hole.

[0052] It is understood that the hollow through-hole and the sealing section have the same axis. The diameter of the hollow through-hole can be determined according to the size of the internal heating element of the heating device used in conjunction with it. When the heated cigarette of the present invention is used in conjunction with a heating device (cigarette electric heating device) containing an internal heating element, it is necessary to ensure that the heated cigarette and the internal heating element are in close contact so that when the heated cigarette is heated, the airflow is drawn into the core material (tobacco matrix) through the micropores of the composite cigarette paper without passing through the end face of the heated cigarette.

[0053] To reduce the escape of aroma components from the cigarette core material and prevent airflow from entering the core material from the end face, which would cause the airflow introduced from the end face to carry away most of the aroma components during the first few puffs, reducing the sustained release effect and affecting the stability of the release, the hollow through-hole and the internal heating element are preferably fitted together to ensure a tight fit. The diameter of the hollow through-hole is the same as the diameter of the internal heating element.

[0054] Preferably, the axial length of the sealing section is 1 to 5 mm.

[0055] Preferably, the sealing section includes a sealing material matrix.

[0056] Preferably, the sealing material matrix is ​​made of an elastic material. It is understood that elastic materials are airtight, and their operating temperature needs to be higher than the temperature range commonly used when heating cigarettes. Preferably, the operating temperature of the elastic material is ≥300℃.

[0057] Preferably, the sealing material matrix is ​​food-grade high-temperature silicone. Preferably, the food-grade high-temperature silicone has an operating temperature ≥300℃.

[0058] Preferably, the sealing section includes a sealing material matrix and cigarette paper wrapping the sealing material matrix. It is understood that the cigarette paper wrapping the sealing material matrix can be ordinary cigarette paper or, as described above, heated cigarette composite cigarette paper. Attached Figure Description

[0059] Figure 1This is a schematic diagram of the appearance of a heated cigarette composite paper suitable for internal and external coupled heating according to Embodiment 1 of the present invention; wherein, the reference numerals are as follows: 31-first cigarette paper layer; 32-coating layer; 33-second cigarette paper layer;

[0060] Figure 2 This is a schematic diagram of the structure of a heated cigarette suitable for internal and external coupling heating according to Embodiment 5 of the present invention; wherein, the reference numerals are as follows: 1-cigarette core section; 2-sealing section; 3-heated cigarette composite cigarette paper; 4-filter rod section;

[0061] Figure 3 This is a schematic diagram showing the state of the cigarette core segment of the heated cigarette prepared from the heated cigarette composite cigarette paper of Embodiments 1-2 of the present invention in the cigarette electric heating device; wherein, the reference numerals are as follows: 31-first cigarette paper layer; 32-coating layer; 33-second cigarette paper layer; 5-tobacco matrix; 52-external heating element of the cigarette electric heating device;

[0062] Figure 4 The figures are schematic diagrams of the heated cigarettes in the electric cigarette heating device according to embodiments 5-6 of the present invention; wherein, the reference numerals are as follows: 1-cigarette core section; 2-sealing section; 3-heated cigarette composite cigarette paper; 4-filter rod section; 51-inner heating element; 52-outer heating element; 53-heating control system;

[0063] Figure 5 This is a schematic diagram showing the nicotine release results of Embodiment 5 of the present invention and commercially available heated cigarettes at different puff sequences;

[0064] Figure 6 This is a schematic diagram showing the release of aroma components in Example 5 of the present invention and commercially available heated cigarettes at different puff sequences. Detailed Implementation

[0065] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0066] I. Specific embodiments of the heated cigarette composite paper of the present invention, suitable for internal and external coupled heating, are as follows:

[0067] Example 1

[0068] The heated cigarette composite paper of this embodiment, suitable for internal and external coupling heating, includes a first cigarette paper layer, a coating layer, and a second cigarette paper layer sequentially bonded together. Both the first and second cigarette paper layers are composed of cigarette paper fibers, calcium carbonate filler, thermally conductive filler, flame retardant, and viscosity modifier. In the first cigarette paper layer, the mass fraction of calcium carbonate filler is 20%, the mass fraction of thermally conductive filler is 5%, the mass fraction of flame retardant is 5%, the mass fraction of viscosity modifier is 5%, and the remainder is cigarette paper fibers. In the second cigarette paper layer, the mass fraction of calcium carbonate filler is 20%, the mass fraction of thermally conductive filler is 5%, the mass fraction of flame retardant is 5%, the mass fraction of viscosity modifier is 5%, and the remainder is cigarette paper fibers. In the first cigarette paper layer, the thermally conductive filler is alumina powder, the flame retardant is dihydrogen phosphate, and the viscosity modifier is guar gum. In the second cigarette paper layer, the thermally conductive filler is alumina powder, the flame retardant is dihydrogen phosphate, and the viscosity modifier is guar gum.

[0069] The first cigarette paper layer is 100 μm thick and has micropores with a pore size of 0.5 μm and a pore density of 500 micropores / cm³. 2 ;

[0070] The second cigarette paper layer is 50 μm thick and has micropores with a pore size of 5 μm and a pore density of 600 micropores / cm³. 2 ;

[0071] The coating thickness is 100 μm;

[0072] The coating layer is made of a coating liquid, which consists of nicotine-based substances, glycosides, flavorings, flame retardants, viscosity modifiers, tobacco extract, and solvents. The nicotine-based substances are tartrate nicotine salts, the glycosides are vanillin glucoside, the flame retardant is dihydrogen phosphate, the viscosity modifier is guar gum, and the solvent is glycerol. In the coating liquid, the mass fraction of nicotine-based substances is 5%, the mass fraction of glycosides is 10%, the mass fraction of flavorings (roasted sweet functional flavoring) is 5%, and the mass fraction of flame retardants is 5%. The viscosity modifier has a mass fraction of 5%, the tobacco extract (the preparation method of tobacco extract is as follows: tobacco is crushed to obtain powder with a particle size of 80 mesh, and then the powder and a 70% ethanol aqueous solution are added to the reaction vessel at a mass ratio of 9:1. Then the mixture is heated to 60°C, and the material in the reactor is sealed and kept warm for 4 hours under stirring. Then the mixture is filtered, and the filtrate is concentrated to obtain tobacco extract, in which the mass fraction of tobacco extract is 10%) has a mass fraction of 5%, and the remainder is solvent.

[0073] A schematic diagram of the appearance of the heated cigarette composite paper suitable for internal and external coupling heating in this embodiment is shown below. Figure 1As shown, it includes a first cigarette paper layer 31, a coating layer 32, and a second cigarette paper layer 33.

[0074] Example 2

[0075] The heated cigarette composite paper of this embodiment, suitable for internal and external coupling heating, includes a first cigarette paper layer, a coating layer, and a second cigarette paper layer sequentially bonded together. Both the first and second cigarette paper layers are composed of cigarette paper fibers, calcium carbonate filler, thermally conductive filler, flame retardant, and viscosity modifier. In the first cigarette paper layer, the mass fraction of calcium carbonate filler is 10%, the mass fraction of thermally conductive filler is 1%, the mass fraction of flame retardant is 10%, the mass fraction of viscosity modifier is 1%, and the remainder is cigarette paper fibers. In the second cigarette paper layer, the mass fraction of calcium carbonate filler is 30%, the mass fraction of thermally conductive filler is 10%, the mass fraction of flame retardant is 1%, the mass fraction of viscosity modifier is 10%, and the remainder is cigarette paper fibers. In the first cigarette paper layer, the thermally conductive filler is aluminum nitride powder, the flame retardant is ammonium polyphosphate, and the viscosity modifier is carrageenan. In the second cigarette paper layer, the thermally conductive filler is alumina powder, the flame retardant is magnesium hydroxide, and the viscosity modifier is xanthan gum.

[0076] The first cigarette paper layer is 50 μm thick and has micropores with a pore size of 5 μm and a pore density of 300 micropores / cm³. 2 ;

[0077] The second cigarette paper layer is 30 μm thick and has micropores with a pore size of 8 μm and a pore density of 500 micropores / cm³. 2 ;

[0078] The coating thickness is 100 μm;

[0079] The coating layer is made of a coating liquid, which consists of nicotine-based substances, glycosides, flavorings, flame retardants, viscosity modifiers, tobacco extract, and a solvent. The nicotine-based substance is malic acid nicotine salt, the glycoside is ethyl vanillin glucoside, the flame retardant is ammonium polyphosphate, the viscosity modifier is carrageenan, and the solvent is glycerol. In the coating liquid, the mass fraction of nicotine-based substances is 5%, the mass fraction of glycosides is 10%, the mass fraction of flavorings (roasted functional flavorings) is 5%, and the mass fraction of flame retardants is 5%. The viscosity modifier has a mass fraction of 5%, the tobacco extract (the preparation method of tobacco extract is: pulverize tobacco to obtain powder with a particle size of 80 mesh, then add the powder and a 70% ethanol aqueous solution at a mass ratio of 8:2 into a reaction vessel, then heat to 60°C, seal and keep the material in the reactor under stirring for 4 hours, then filter, and then concentrate the filtrate to obtain tobacco extract, the mass fraction of tobacco extract in the tobacco extract is 15%) has a mass fraction of 5%, and the remainder is solvent.

[0080] Comparative Example 1

[0081] The heated cigarette composite paper of this comparative example includes a first cigarette paper layer, an aluminum foil layer, a coating layer, and a second cigarette paper layer sequentially bonded together. The first and second cigarette paper layers in the heated cigarette composite paper of this comparative example are the same as those in the heated cigarette composite paper of Example 1. The coating layer in the heated cigarette composite paper of this comparative example is the same as that in the heated cigarette composite paper of Example 1. The thickness of the aluminum foil layer in the heated cigarette composite paper of this comparative example is 6 μm.

[0082] II. Specific embodiments of the preparation method of the heated cigarette composite paper suitable for internal and external coupled heating according to the present invention are as follows:

[0083] Example 3

[0084] The preparation method of the heated cigarette composite paper suitable for internal and external coupled heating in this embodiment is the same as the preparation method of the heated cigarette composite paper suitable for internal and external coupled heating in Example 1, and specifically includes the following steps:

[0085] Lay the first cigarette paper layer flat, then evenly apply the coating liquid to one surface of the first cigarette paper layer to form a coating liquid layer on one surface of the first cigarette paper layer. Then lay the second cigarette paper layer flat on the coating liquid layer. Finally, apply pressure evenly to one surface of the second cigarette paper layer away from the coating liquid layer and dry it at 40°C for 5 minutes. After the coating liquid layer dries, a coating layer is formed.

[0086] The first and second cigarette paper layers are obtained commercially.

[0087] Example 4

[0088] The preparation method of the heated cigarette composite paper suitable for internal and external coupled heating in this embodiment is the same as the preparation method of the heated cigarette composite paper suitable for internal and external coupled heating in Example 2, which specifically includes the following steps:

[0089] Lay the first cigarette paper layer flat, then evenly apply the coating liquid to one surface of the first cigarette paper layer to form a coating liquid layer on one surface of the first cigarette paper layer. Then lay the second cigarette paper layer flat on the coating liquid layer. Finally, apply pressure evenly to one surface of the second cigarette paper layer away from the coating liquid layer and dry it at 40°C for 5 minutes. After the coating liquid layer dries, a coating layer is formed.

[0090] The first and second cigarette paper layers are obtained commercially.

[0091] III. Specific embodiments of the heated cigarette of the present invention, suitable for internal and external coupled heating, are as follows:

[0092] Example 5

[0093] The heated cigarette of this embodiment, suitable for internal and external coupling heating, includes a filter rod segment, a core segment, and a sealing segment connected in sequence. The core segment includes a tobacco matrix and cigarette paper wrapping the tobacco matrix. The sealing segment includes a sealing material matrix (made of silicone) and cigarette paper wrapping the sealing material matrix. The sealing material matrix is ​​provided with a coaxial hollow through hole (the diameter of the hollow through hole is 2mm, and the diameter of the internal heating element of the heating device used with the heated cigarette in this embodiment is 2mm). The cigarette paper used in the core segment and the sealing segment is the heated cigarette composite cigarette paper of Example 1. The distances on the axis of the filter rod segment, the core segment, and the sealing segment are 20, 15, and 3mm, respectively.

[0094] The structural diagram of the heated cigarette suitable for internal and external coupling heating in this embodiment is shown below. Figure 2 As shown, it includes a filter rod section 4, a cigarette core section 1, and a sealing section 2 connected in sequence. The cigarette core section 1 and the sealing section 2 are wrapped with heated cigarette composite cigarette paper 3. The sealing section 2 is provided with a hollow through hole on the same axis.

[0095] Example 6

[0096] The heated cigarette of this embodiment, suitable for internal and external coupling heating, includes a filter rod segment, a core segment, and a sealing segment connected in sequence. The core segment includes a tobacco matrix and cigarette paper wrapping the tobacco matrix. The sealing segment includes a sealing material matrix (made of silicone) and cigarette paper wrapping the sealing material matrix. The sealing material matrix is ​​provided with a coaxial hollow through hole (the diameter of the hollow through hole is 1.5 mm, and the diameter of the internal heating element of the heating device used with the heated cigarette in this embodiment is 1.5 mm). The cigarette paper used in the core segment and the sealing segment is the heated cigarette composite cigarette paper of Example 2. The distances on the axis of the filter rod segment, the core segment, and the sealing segment are 15 mm, 10 mm, and 2 mm, respectively.

[0097] Comparative Example 2

[0098] The only difference between the heated cigarette in this comparative example and the heated cigarette in Example 5 is that the diameter of the coaxial hollow through-hole in the sealing material matrix of the heated cigarette in this comparative example is 3 mm larger than the diameter of the inner heating element.

[0099] Experimental Example 1

[0100] To evaluate the smoking stability of the heated cigarettes prepared from the heated cigarette composite paper of Examples 1-2 and Comparative Example 1, the heated cigarette composite paper of Examples 1-2 and Comparative Example 1 were used to make identical conventional heated cigarettes (excluding the sealing section). Then, a cigarette electric heating device with external heating and / or internal heating (the cigarette electric heating device disclosed in Chinese Patent Document CN208143515U) was used for smoking tests under the same mode (internal and external coupled heating). The test results are shown in Table 1. A schematic diagram of the state of the cigarette core segment of the heated cigarettes prepared from the heated cigarette composite paper of Examples 1-2 in the cigarette electric heating device is shown below. Figure 3 As shown, the cigarette core section includes a first cigarette paper layer 31, a coating layer 32, a second cigarette paper layer 33, and a tobacco matrix 5. The outer side of the heated cigarette is the first cigarette paper layer 31, which is in contact with the external heating element 52 of the cigarette electric heating device.

[0101] Table 1 shows the smoking stability of heated cigarettes prepared from heated cigarette composite paper in Examples 1-2 and Comparative Example 1.

[0102]

[0103] Experimental Example 2

[0104] To evaluate the smoking stability of Examples 5-6, Comparative Example 2, and commercially available heated cigarettes, smoking tests were conducted using an electric cigarette heating device (the electric cigarette heating device disclosed in Chinese Patent Document CN 208143515U) with external heating and / or internal heating in the same mode (heating mode being internal and external coupling heating); the schematic diagram of the heated cigarettes in Examples 5-6 within the electric cigarette heating device is shown below. Figure 4 As shown, the heated cigarette includes a filter rod section 4, a core section 1, and a sealing section 2 connected in sequence. The core section 1 and sealing section 2 are wrapped with heated cigarette composite paper 3. The sealing section 2 has a coaxial hollow through-hole through which a cylindrical inner heating element 51 of the electric heating device passes. The inner heating element 51 heats the interior of the heated cigarette, while the outer heating element 52 of the electric heating device heats the exterior. The electric heating device uses a heating control system 53 to detect and control the temperatures of the inner and outer heating elements 51 and 52. Because the sealing material matrix in the sealing section 2 is silicone, it will not deform or burn during heating, ensuring a good seal. Due to the distance between the outer heating element and the outside of the heated cigarette, air can enter the heated cigarette through the gap during inhalation. Furthermore, the presence of the sealing section 2 prevents gas from entering or overflowing from the end face of the heated cigarette. During the experiment, the release of nicotine and flavor components from heated cigarettes was recorded at different puff sequences, and the results are shown in Table 2. A graph was also plotted showing the release of nicotine and flavor components from Example 5 and commercially available heated cigarettes at different puff sequences, and the results are shown below. Figure 5-6 As shown. Figure 5-6 The heated cigarette of the present invention represents the heated cigarette of Example 5, and the heated cigarette product represents commercially available heated cigarettes.

[0105] Table 2 shows the release of nicotine and flavor components from heated cigarettes in Examples 5-6 and Comparative Example 2 at different puff sequences.

[0106]

Claims

1. A type of heated cigarette composite paper suitable for internal and external coupled heating, characterized in that, The device includes a first cigarette paper layer, a coating layer, and a second cigarette paper layer that are sequentially bonded together. The first and second cigarette paper layers each contain a thermally conductive filler and a flame retardant. The mass fraction of the thermally conductive filler in the first and second cigarette paper layers is independently 1% to 10%, and the mass fraction of the flame retardant in the first and second cigarette paper layers is independently 1% to 10%. The thickness of the first cigarette paper layer is greater than the thickness of the second cigarette paper layer, and the air permeability of the first cigarette paper layer is less than that of the second cigarette paper layer. The coating layer is made of a coating liquid, which includes 5-10% by mass of nicotine-based substances, 5-10% by mass of glycoside compounds, 5-10% by mass of fragrance, flame retardant and solvent.

2. The heated cigarette composite paper suitable for internal and external coupled heating as described in claim 1, characterized in that, The thickness of the first cigarette paper layer is 50–200 μm; the thickness of the second cigarette paper layer is 30–100 μm.

3. The heated cigarette composite paper suitable for internal and external coupled heating as described in claim 1 or 2, characterized in that, Both the first cigarette paper layer and the second cigarette paper layer are provided with micropores; the pore diameter of the micropores provided in the first cigarette paper layer is smaller than the pore diameter of the micropores provided in the second cigarette paper layer.

4. The heated cigarette composite paper suitable for internal and external coupled heating as described in claim 3, characterized in that, The pore size of the micropores on the first cigarette paper layer is 0.1~10μm; the pore density of the micropores on the first cigarette paper layer is 500~5000 pores / cm³. 2 The pore size of the micropores on the second cigarette paper layer is 0.2~20μm; the pore density of the micropores on the second cigarette paper layer is 500~5000 pores / cm³. 2 .

5. The heated cigarette composite paper suitable for internal and external coupled heating as described in claim 1 or 2, characterized in that, The thermally conductive filler in the first and second cigarette paper layers is independently selected from one or any combination of alumina powder, aluminum nitride powder, and silicon carbide powder; the flame retardant in the first and second cigarette paper layers is an inorganic flame retardant; the inorganic flame retardant in the first and second cigarette paper layers is independently selected from one or any combination of dihydrogen phosphate, ammonium polyphosphate, and magnesium hydroxide; the mass fraction of the thermally conductive filler in the first cigarette paper layer is 1-5%; the mass fraction of the thermally conductive filler in the second cigarette paper layer is 5%-10%; the mass fraction of the flame retardant in the first cigarette paper layer is 5%-10%; the mass fraction of the flame retardant in the second cigarette paper layer is 1%-5%; the thickness of the first cigarette paper layer is 50-100 μm; and the thickness of the second cigarette paper layer is 30-50 μm.

6. The heated cigarette composite paper suitable for internal and external coupled heating as described in claim 1 or 2, characterized in that, The first cigarette paper layer and the second cigarette paper layer also independently include a viscosity modifier; the viscosity modifier in the first cigarette paper layer and / or the second cigarette paper layer is selected from one or any combination of guar gum, carrageenan, and xanthan gum.

7. The heated cigarette composite paper suitable for internal and external coupled heating as described in claim 1 or 2, characterized in that, The nicotine-like substance is nicotine and / or nicotine salt; the glycoside compound is a glucosinolate compound; the flame retardant in the coating liquid is a phosphorus-based flame retardant; the coating liquid also includes a viscosity modifier; the viscosity modifier in the coating liquid is selected from one or any combination of guar gum, carrageenan, and xanthan gum.

8. A method for preparing a heated cigarette composite paper suitable for internal and external coupled heating as described in any one of claims 1-7, characterized in that, The process includes the following steps: combining a first cigarette paper layer, a coating layer, and a second cigarette paper layer together to obtain heated cigarette composite cigarette paper.

9. A heated cigarette suitable for internal and external coupled heating, characterized in that, It includes a filter rod segment and a tobacco core segment connected in sequence; the tobacco core segment includes a tobacco matrix and a cigarette paper wrapping the tobacco matrix, wherein the cigarette paper is a heated cigarette composite cigarette paper as described in any one of claims 1-7.

10. The heated cigarette suitable for internal and external coupled heating as described in claim 9, characterized in that, The heated cigarette also includes a sealing section, which is located on the side of the core section away from the filter rod section. The sealing section has a coaxial hollow through hole. The axial length of the sealing section is 1-5 mm. The sealing section includes a sealing material matrix. The sealing material matrix is ​​made of an elastic material. The operating temperature of the elastic material is ≥300℃.

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