A heating, non-combustion composite cigarette sheet and a composite cigarette

Abstract

The application discloses a heating non-combustion composite cigarette sheet and a composite cigarette, and relates to the technical field of cigarette sheet production. The heating non-combustion composite cigarette sheet comprises a reconstituted tobacco sheet and a long-fiber base material layer, the reconstituted tobacco sheet is arranged on the surface of the long-fiber base material layer, the long-fiber base material layer is a porous structure, and the length of the long fiber in the long-fiber base material layer is greater than or equal to 10 mm. The heating non-combustion composite cigarette sheet has the advantages that the long-fiber base material layer has good toughness, can provide good support for the reconstituted tobacco sheet in a pressing process, maintains the good sheet structure of the cigarette sheet, has a strong ability to absorb atomizing agents due to the porous structure, can guarantee that more atomizing agents are absorbed in the atomization process, increases the number of atomization holes, guarantees uniform atomization, and improves the smoking taste.

Description

Technical Field

[0001] This invention relates to the field of cigarette sheet production technology, and in particular to a heat-not-burn composite cigarette sheet and a composite cigarette. Background Technology

[0002] Heated tobacco products (HTMS) produce smoke by heating reconstituted tobacco. The smoke mainly comes from the atomized smoke of glycerol / propylene glycol and flavorings. Since the tobacco material is not burned during use, and it is heated to a temperature of less than 500°C, its temperature is much lower than that of traditional cigarettes. Therefore, the smoke produced contains far fewer harmful chemical components and less biological toxicity than that of traditional tobacco.

[0003] Currently, mainstream heated tobacco products often incorporate porous materials to increase the number of puffs and minimize draw resistance. Porous materials can absorb more atomizing agent per unit volume, allowing for more puffs per cigarette of the same volume, with each puff producing a larger volume of vapor, resulting in a better vaping experience. However, porous materials generally sacrifice thermal conductivity. Poor thermal conductivity leads to slower vaporization, insufficient heat transfer to the cigarette, and incomplete heating, resulting in poor vaporization and uneven heating, leading to localized carbonization and uneven roasting. This results in a poor taste and, more importantly, uneven vapor release, negatively impacting the vaping experience.

[0004] Some manufacturers currently use a combination of heat-conducting sheets and reconstituted tobacco sheets to obtain heat-dissipating, non-combustible tobacco sheets with uniform heat conduction. However, this structure lacks a substrate layer; simply adding reconstituted tobacco sheets onto the heat-conducting sheet results in poor strength, especially after absorbing atomizing agents, due to the small particle size of the reconstituted tobacco sheets composed of crushed tobacco powder, heat-conducting powder, and binders. When multiple layers are coated or pressed onto the heat-conducting sheet, the tobacco powder is only bonded to the sheets by less than 5% binder, leading to very low toughness. Furthermore, the manufacturing process often involves extrusion and stretching, causing the tobacco powder to easily peel off from the pressed surface, damaging the sheet structure and making it difficult to obtain thick and complete tobacco sheets. This reduces the number of puffs that can be atomized. The damage and unevenness of the sheet structure also easily lead to inconsistent thermal conductivity and heat absorption. Areas that absorb more heat atomize first or continue to be heated and carbonized, while areas that absorb less heat are not atomized and the smoke cannot be released. Throughout the smoking process, the flavor and atomization amount of the smoke are uneven, resulting in a poor smoking experience.

[0005] Therefore, the field of heated tobacco products urgently needs a type of cigarette or tobacco sheet that is structurally intact, not easily peeled or damaged, has high oil absorption and a large number of atomization puffs, a good smoking experience, and also has high thermal conductivity and uniform heat conduction. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a heat-not-burn composite cigarette sheet. By incorporating a long-fiber substrate layer, the long-fiber substrate layer exhibits good toughness and provides excellent support for the reconstituted cigarette sheet during the pressing process, maintaining the good sheet structure of the cigarette sheet. Furthermore, its porous structure has a strong ability to absorb atomizing agents, ensuring that more atomizing agents are absorbed during the atomization process, increasing the number of puffs, while also ensuring uniform atomization and improving the smoking experience.

[0007] Specifically, the present invention discloses a heat-not-burn composite cigarette sheet, comprising a reconstituted tobacco sheet and a long fiber substrate layer. The reconstituted tobacco sheet is disposed on the surface of the long fiber substrate layer, the long fiber substrate layer has a porous structure, and the length of the long fibers in the long fiber substrate layer is greater than or equal to 10 mm.

[0008] Preferably, the thickness of the reconstituted tobacco sheet is 0.08-0.2 mm, and the thickness of the long fiber substrate layer is 0.02-0.3 mm.

[0009] Preferably, it further includes a high thermal conductivity film, which is disposed on the surface of the reconstituted tobacco sheet; the high thermal conductivity film is made of one or more of the following materials: metal, alloy, and carbon-based substances.

[0010] Preferably, the thickness of the high thermal conductivity film is 5-100 μm.

[0011] Preferably, the metal is one or a mixture of aluminum, copper, magnesium, zinc, silver, and tungsten; the alloy is one or a mixture of aluminum alloy, copper alloy, magnesium alloy, zinc alloy, silver alloy, and tungsten alloy; and the carbon-based material is one or a mixture of graphite, carbon black, carbon nanotubes, graphene, and carbon whiskers.

[0012] Preferably, by weight, the reconstituted tobacco sheet comprises the following components: 25-40 parts tobacco powder, 35-50 parts atomizing agent, 1-5 parts binder, 0-7 parts porous material, 0-7 parts thermally conductive powder, 0-5 parts flavoring, and 10-18 parts water; the average mesh size of the tobacco powder is 50-100 mesh, obtained by grinding tobacco fibers.

[0013] Preferably, the atomizing agent is one or a mixture of two of propylene glycol and glycerol; the binder is one or a mixture of more than one of carboxymethyl cellulose, sodium alginate, guar gum, modified starch, xanthan gum and gum arabic.

[0014] Preferably, the porous material is one or a mixture of more than one of silicon dioxide, diatomaceous earth, and alumina; the thermally conductive powder is one or a mixture of more than one of aluminum nitride, boron nitride, silver-plated copper, aluminum-plated copper, copper powder, and aluminum powder.

[0015] Preferably, the reconstituted tobacco sheet is obtained by mixing tobacco powder, atomizing agent, binder, water, and / or porous material, and / or thermally conductive powder, and / or flavoring, and then rolling and pressing it together.

[0016] Preferably, the above-mentioned method for preparing the heat-not-burn composite cigarette sheet includes the following steps:

[0017] Pretreatment: The surface of the long fiber substrate layer is subjected to corona treatment;

[0018] Co-pressing: After stacking the long fiber substrate layer and the reconstituted tobacco sheet, the layers are rolled and pressed together, and then dried to obtain a heat-not-burn composite cigarette sheet.

[0019] Preferably, the processing voltage of the corona treatment is 3-8kV; the rolling speed of the rolling press is ≤15r / min.

[0020] Preferably, the method for preparing the heated non-combustible composite cigarette sheet further includes re-pressing, whereby a layer of reconstituted tobacco sheet is stacked on the surface of the heated non-combustible composite cigarette sheet that does not contain reconstituted tobacco sheet, and then rolled and pressed to obtain a heated non-combustible composite cigarette sheet whose surface contains reconstituted tobacco sheet.

[0021] The present invention also discloses a composite cigarette, comprising the above-mentioned heated non-combustible composite cigarette sheet. Beneficial effects

[0022] (1) The heated non-combustible composite cigarette sheet of the present invention is composed of a long fiber substrate layer, a reconstituted tobacco sheet, and / or a high thermal conductivity film; the reconstituted tobacco sheet is attached to the long fiber substrate layer and is tightly bonded to the long fiber substrate layer. The long fiber substrate layer has good toughness and can provide good support for the reconstituted tobacco sheet during the pressing process, maintain the good sheet structure of the cigarette sheet, and its own porous structure has a strong ability to absorb atomizing agent, which can ensure that more atomizing agent is absorbed during the atomization process, increase the number of atomization puffs, and at the same time ensure uniform atomization and improve the smoking experience.

[0023] (2) In the preparation process of the heat-not-burning composite cigarette sheet of the present invention, the surface of the long fiber substrate layer is hydroxylated by corona treatment, which improves the wettability of the substrate layer; at the same time, combined with the pressing process, the binder in the reconstituted cigarette sheet is pressed into the joint between the reconstituted cigarette sheet and the long fiber substrate layer, so that the reconstituted cigarette sheet and the long fiber substrate layer are tightly bonded, ensuring the adhesion between the two.

[0024] (3) The heat-not-burning composite cigarette sheet of the present invention can be shredded and rolled into cigarettes by a cigarette rolling device. The resulting composite cigarette can make the same volume of cigarettes have more atomization puffs, and the amount of atomization per puff is greater. It also has uniform heat conduction and atomization, which can bring a better smoking taste and smoking experience. Attached Figure Description

[0025] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a heat-not-burning composite cigarette sheet according to the present invention;

[0027] Figure 2 This is a schematic diagram of another type of heated non-combustible composite cigarette sheet according to the present invention;

[0028] Figure 3 This is a schematic diagram of another type of heated non-combustible composite cigarette sheet according to the present invention;

[0029] Figure 4 This is a comparative schematic diagram showing the smoking test results of composite cigarettes made from the heat-not-burn composite cigarette sheets prepared in Example 1 and Comparative Example 3, respectively, in this invention. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0034] It should also be understood that the term "concentration" as used in this specification and the appended claims refers to mass concentration, while "%" refers to mass percentage content, unless otherwise explained.

[0035] A heat-not-burn composite cigarette sheet includes a reconstituted tobacco sheet and a long fiber substrate layer; the reconstituted tobacco sheet is disposed on the surface of the long fiber substrate layer, the thickness of the reconstituted tobacco sheet is 0.08-0.2 mm, and the thickness of the long fiber substrate layer is 0.02-0.3 mm; the long fiber substrate layer has a porous structure, and the length of the long fibers in the long fiber substrate layer is greater than or equal to 10 mm.

[0036] The long fiber substrate layer is made of long fibers, which have good toughness and can provide a good support structure. It can provide a foundation for the tobacco sheets on both sides. The thickness of each side is not too thick, so it is not easy to peel off from the bonding surface and damage the sheet structure. At the same time, the substrate layer has a porous structure, which is conducive to more absorption of atomizing agent. Combined with the double-sided loading, it can produce more atomized products.

[0037] Specifically, in the long fiber substrate layer, the long fibers can be porous long fiber films prepared from natural plants such as wood, bamboo, leaves, cotton, hemp, or a mixture of at least two of them; and the porosity of the long fiber substrate layer is greater than 50%; the long fiber substrate layer can adopt a woven structure or an adhesive structure, and the long fibers can be mixed with heat-conducting wires or have an over-plated heat-conducting layer added to increase thermal conductivity.

[0038] By weight, the reconstituted tobacco sheet contains the following components: 25-40 parts tobacco powder, 35-50 parts atomizing agent, 1-5 parts binder, 0-7 parts porous material, 0-7 parts thermally conductive powder, 0-5 parts flavoring, and 10-18 parts water; the average mesh size of the tobacco powder is 50-100 mesh, obtained by grinding tobacco fibers.

[0039] The atomizing agent is one or a mixture of two of propylene glycol and glycerol; the binder is one or a mixture of more than one of carboxymethyl cellulose, sodium alginate, guar gum, modified starch, xanthan gum, and gum arabic; the porous material is one or a mixture of more than one of silica, diatomaceous earth, and alumina; the thermally conductive powder is one or a mixture of more than one of aluminum nitride, boron nitride, silver-plated copper, aluminum-plated copper, copper powder, and aluminum powder; the flavoring is used to enhance the taste and can be plant extracts or edible flavorings, preferably tobacco flavorings.

[0040] Reconstituted tobacco sheets are produced by mixing tobacco powder, atomizing agent, binder, water, and / or porous material, and / or thermally conductive powder, and / or flavoring, and then rolling and pressing them together. Specifically, the tobacco powder, atomizing agent, binder, water, and / or porous material, and / or thermally conductive powder, and / or flavoring are mixed and fed into a roller press for uniform mixing. The rolling speed is 3-5 r / min, and the mixture is rolled 2-3 times to obtain reconstituted tobacco sheets, which can be taken out for use.

[0041] Meanwhile, to improve the thermal conductivity of the heated non-combustible composite cigarette sheet, a high thermal conductivity film can be added. This film is applied to the surface of the reconstituted cigarette sheet, and its thickness is 5-100 μm. The high thermal conductivity film is made of one or more of the following materials: metal, alloy, and carbon-based substances. Specifically, the metal is one or more of the following: aluminum, copper, magnesium, zinc, silver, and tungsten; the alloy is one or more of the following: aluminum alloy, copper alloy, magnesium alloy, zinc alloy, silver alloy, and tungsten alloy; and the carbon-based substance is one or more of the following: graphite, carbon black, carbon nanotubes, graphene, and carbon whiskers.

[0042] In heated tobacco sheets, to improve the thermal conductivity of the composite cigarette sheet, heat-conducting wires can be added to the long-fiber substrate layer, or a high-thermal-conductivity film can be pressed onto the surface of the reconstituted tobacco sheet. To improve the flavor of the cigarette sheet, reconstituted tobacco sheets with different pore sizes can be attached to the long-fiber substrate layer to create a capillary effect. The capillary effect can transfer the atomizing agent from the large pores to the small pores, forming a transmission force that causes the atomizing agent to flow onto the high-temperature heat-conducting sheet for more thorough atomization. To increase the natural tobacco aroma of the long-fiber substrate layer, a mixture of tobacco powder and tobacco stems can be soaked in the long-fiber substrate layer beforehand by soaking or brushing. To avoid the problem of high draw resistance caused by excessive density of the tobacco powder and tobacco stem mixture, the mixture of tobacco powder and tobacco stems can be mixed with fermentable bacteria and fermented to make it porous.

[0043] Specifically, a heat-not-burn composite cigarette sheet includes a long-fiber substrate layer 1 and a reconstituted tobacco sheet 2 stacked from bottom to top, such as... Figure 1 The thickness of the long fiber substrate layer 1 is 0.02-0.3 mm, and the thickness of the reconstituted tobacco sheet 2 is 0.08-0.2 mm.

[0044] The reconstituted tobacco sheet 2 can be disposed on a single surface or both surfaces of the long fiber substrate layer 1; that is, the reconstituted tobacco sheet 2 includes a first reconstituted tobacco sheet 21 and a second reconstituted tobacco sheet 22. Specifically, in one embodiment, the heated non-combustible composite cigarette sheet includes a second reconstituted tobacco sheet 22, a long fiber substrate layer 1, and a first reconstituted tobacco sheet 21 stacked from bottom to top, such as... Figure 2 The thickness of the first reconstituted smoke sheet 21 and the second reconstituted smoke sheet 22 is the same as that of the reconstituted smoke sheet 2, which is 0.08-0.2 mm.

[0045] Simultaneously, a high thermal conductivity film 3 can be formed on the surface of the reconstituted tobacco sheet 2 to improve the thermal conductivity of the tobacco sheet; the thickness of the high thermal conductivity film 3 is 5-100μm; when the heated non-combustible composite cigarette sheet contains several reconstituted tobacco sheets 2, the high thermal conductivity film 3 can be formed on the surface of one of the reconstituted tobacco sheets 2, or the high thermal conductivity film 3 can be formed on the surface of all the reconstituted tobacco sheets 2. Specifically, in one embodiment, the heated non-combustible composite cigarette sheet includes a high thermal conductivity film 3, a first reconstituted tobacco sheet 21, a long fiber substrate layer 1, and a second reconstituted tobacco sheet 22 stacked from bottom to top, such as Figure 3 .

[0046] A method for preparing a heat-not-combustible composite cigarette sheet includes the following steps:

[0047] Pretreatment: The surface of the long fiber substrate layer is subjected to corona treatment;

[0048] Co-pressing: After the long fiber substrate layer and the reconstituted tobacco sheet are rolled and pressed together, and then dried, a heat-not-burning composite cigarette sheet is obtained.

[0049] The corona treatment voltage is 3-8kV; the rolling rate of the rolling press is ≤3r / min.

[0050] If the heated non-combustible composite cigarette sheet also needs to include a high thermal conductivity film, then after the rolling pressing step of co-pressing and before the drying step, the high thermal conductivity film is placed on the surface of the reconstituted tobacco sheet, and then the long fiber substrate layer containing the high thermal conductivity film and the reconstituted tobacco sheet is rolled and pressed, and then dried to obtain the heated non-combustible composite cigarette sheet; specifically, for ease of operation, the two pressing steps can be combined into one, that is, the long fiber substrate layer, the reconstituted tobacco sheet, and the high thermal conductivity film are stacked in a bottom-to-top stacking order, and then rolled and pressed once, followed by drying to obtain the heated non-combustible composite cigarette sheet (containing the high thermal conductivity film).

[0051] Specifically, the surface of the long fiber substrate layer is subjected to corona treatment at a voltage of 3-8 kV for 4-15 seconds. After corona treatment, the surface of the long fiber substrate layer is hydroxylated and etched to a certain extent, which roughens the surface and improves the wettability of the substrate layer. The treated substrate layer needs to be stored in a dry environment. Before use, it is sprayed with an aqueous solution of propylene glycol and glycerol (specifically, the aqueous solution contains 30% propylene glycol and 70% glycerol) for wetting treatment. The aqueous solution is sprayed onto the surface of the long fiber substrate layer using a high-pressure pump. To increase the thermal conductivity, heat-conducting wires, such as fine metal wires, can be heated in the long fiber structure of the long fiber substrate layer, or a heat-conducting layer can be plated onto the long fiber substrate layer. To enhance the natural tobacco aroma of the long-fiber substrate layer, a mixture of tobacco powder and stems can be pre-soaked on the long-fiber substrate layer by soaking or brushing. To avoid the problem of high draw resistance caused by excessive density of the tobacco powder and stem mixture, the mixture of tobacco powder and stems can be mixed with fermentable bacteria to make it porous through fermentation.

[0052] The processed long fiber substrate layer and the reconstituted tobacco sheet are fed together into the roller gap of the roller press. The size of the roller gap is determined by the thickness of the long fiber substrate layer and the thickness of the reconstituted tobacco sheet on one side of the substrate. Since the long fiber substrate layer needs to be fed into the roller gap to avoid wrinkles, the roller speed is uniform during feeding and cannot be too fast, not exceeding 15 r / min.

[0053] The pressed long-fiber substrate layer and reconstituted tobacco sheet are peeled off from the upper roller. Due to the pressing between the two rollers, the reconstituted tobacco sheet can adhere to the long-fiber substrate layer. Since the long-fiber substrate layer has a porous structure, some components of the reconstituted tobacco sheet (such as the binder) are pressed into the long-fiber substrate layer, which can better bond with the long-fiber substrate layer and is not easy to peel off from the substrate layer. The long-fiber substrate layer with reconstituted tobacco sheet attached to its single surface is placed in an oven at 80-115℃ and baked. By controlling the baking time, the moisture content of the resulting heat-not-burning composite cigarette sheet (i.e., the long-fiber substrate layer with reconstituted tobacco sheet on its single surface) is controlled to be within the range of 8-12%.

[0054] The resulting long fiber substrate layer with reconstituted tobacco sheets on a single surface (i.e., heat-not-burn composite cigarette sheet) can be re-pressed, that is, reconstituted tobacco sheets are stacked on a surface without reconstituted tobacco sheets and rolled and pressed to obtain heat-not-burn composite cigarette sheet with reconstituted tobacco sheets on both surfaces (i.e., long fiber substrate layer with reconstituted tobacco sheets on both the upper and lower surfaces).

[0055] Specifically, the long fiber substrate layer containing reconstituted tobacco sheets on one side is further fed into the gap between the two rollers of the roller press and re-pressed with the reconstituted tobacco sheets. The reconstituted tobacco sheets are stacked on the side of the long fiber substrate layer that does not contain reconstituted tobacco sheets. This can be controlled by the roller gap. During the process, the roller speed should not be too fast and should not exceed 15 r / min. After pressing, the long fiber substrate layer containing reconstituted tobacco sheets on both sides is peeled off from the rollers.

[0056] A high thermal conductivity film can be attached to the reconstituted smoke sheet. In order to improve the adhesion between the high thermal conductivity film and the reconstituted smoke sheet, the high thermal conductivity film can be placed directly on the reconstituted smoke sheet and rolled together with the reconstituted smoke sheet and the long fiber substrate layer, or it can be placed on the surface of the reconstituted smoke sheet containing the long fiber substrate layer and then re-pressed.

[0057] If a high thermal conductivity film is not required to be laminated on the reconstituted tobacco sheet, the heated non-combustible composite cigarette sheet (including the long fiber substrate layer of the reconstituted tobacco sheet) can be pre-dried and then dried; that is, it can be baked in an oven at 50-65℃ for 10-30 minutes, and then placed in an oven at 80-115℃ for baking. The moisture content of the tobacco sheet can be controlled within the range of 8-12% by controlling the baking time.

[0058] When improving the thermal conductivity of reconstituted tobacco sheets by applying a high thermal conductivity film to the surface, the average pore size of the reconstituted tobacco sheets needs to be adjusted according to the position and thickness requirements of the high thermal conductivity film. This achieves good thermal conductivity while improving the suction effect and increasing the number of atomized puffs. Specifically, if the high thermal conductivity film is applied to the surface of the reconstituted tobacco sheet on one side of the long fiber substrate, its average pore size is preferably 5-15 μm, and the average pore size of the reconstituted tobacco sheet on the other side of the long fiber substrate is preferably 25-60 μm. Furthermore, if the heated non-combustible composite cigarette sheet contains several reconstituted tobacco sheets, it is preferable to use reconstituted tobacco sheets with different average pore sizes. This facilitates the formation of a capillary effect between the two layers of reconstituted tobacco sheets on the long fiber substrate. The absorbed atomizing agent is guided to the high thermal conductivity film for heat conduction through the capillary force formed by the pore difference, adjusting the suction taste and providing the user with different layers of flavor, thus improving the user experience.

[0059] A method for preparing heated non-combustible composite cigarette sheets, wherein the prepared heated non-combustible composite cigarette sheets can be used to prepare composite cigarettes. The method involves cutting the heated non-combustible composite cigarette sheets into shreds and then rolling them with cigarette paper to obtain composite cigarettes. Specifically, after cutting the heated non-combustible composite cigarette sheets into shreds, the shredded composite tobacco shreds are rolled into composite cigarettes using a cigarette rolling device. Example

[0060] 40 parts of tobacco powder, 35 parts of atomizing agent, 5 parts of binder, 3 parts of flavoring, and 17 parts of water were fed into a roller press and mixed evenly at a rolling speed of 4 r / min. After rolling twice, reconstituted tobacco sheet sample 1 was obtained and set aside for later use. The tobacco powder had an average mesh size of 50 mesh and was obtained by grinding tobacco fibers; the atomizing agent was a mixture of propylene glycol and glycerol in a mass ratio of 3:7; the binder was sodium carboxymethyl cellulose; and the flavoring was a tobacco flavoring.

[0061] A heat-not-burning composite cigarette sheet is prepared by corona treatment of the surface of a long fiber substrate layer at a voltage of 5kV for 10 seconds. Then, the corona-treated long fiber substrate layer, reconstituted tobacco sheet sample 1, and a high thermal conductivity film are stacked sequentially from bottom to top and placed in a roller press for rolling pressing at a speed of 2r / min. The pressed composite layer is then peeled off from the upper roller. The reconstituted tobacco sheet sample 1 is then stacked on the other outer surface of the long fiber substrate layer and placed in a roller press for rolling pressing at a speed of 3r / min. The pressed product is then peeled off from the upper roller and baked in a 60℃ oven for 15 minutes, followed by baking in a 100℃ oven. The moisture content of the tobacco sheet is controlled to within 10% by controlling the baking time, thus obtaining the heat-not-burning composite cigarette sheet (the pressing sequence is: first, the reconstituted tobacco sheet is pressed with the long fiber film, dried, then the other side is pressed, and finally the thermal conductivity film is pressed).

[0062] Among them, the high thermal conductivity film is a tungsten-copper alloy film; the thickness of the long fiber substrate layer is 0.1 mm, the thickness of the reconstituted tobacco sheet sample 1 is 0.1 mm, and the thickness of the high thermal conductivity film is 50 μm. In the long fiber substrate layer, the long fibers are organic cotton with a porosity greater than 50%, and the length of the long fibers is greater than 10 mm.

[0063] The total thickness of the heat-not-burning composite cigarette sheet is 0.35 mm. Example

[0064] 32 parts of tobacco powder, 38 parts of atomizing agent, 5 parts of binder, 3 parts of thermal conductive powder, 4 parts of flavoring, and 18 parts of water were fed into a roller press and mixed evenly at a rolling speed of 4 r / min. After rolling twice, reconstituted tobacco sheet sample 2 was obtained and set aside for later use. The tobacco powder had an average mesh size of 100 mesh and was obtained by grinding tobacco fibers; the atomizing agent was a mixture of propylene glycol and glycerol in a mass ratio of 4:6; the binder was a mixture of xanthan gum and gum arabic in a mass ratio of 1:1; the thermal conductive powder was aluminum nitride; and the flavoring was a tobacco flavoring.

[0065] A heat-not-burning composite cigarette sheet is prepared by corona treatment of the surface of a long fiber substrate layer at a voltage of 3kV for 15 seconds. Then, the corona-treated long fiber substrate layer, reconstituted tobacco sheet sample 2, and high thermal conductivity film are stacked in sequence from bottom to top and then placed in a roller press for rolling and pressing at a rolling speed of 2r / min. The pressed composite layer is then torn off from the upper roller. After that, it is baked in an oven at 65℃ for 25 minutes and then baked in an oven at 110℃. The moisture content of the tobacco sheet is controlled within the range of 8% by controlling the baking time, thus obtaining the heat-not-burning composite cigarette sheet.

[0066] The high thermal conductivity film is an aluminum alloy film; the thickness of the long fiber substrate layer is 0.1 mm, the thickness of the reconstituted tobacco sheet sample 1 is 0.1 mm, and the thickness of the high thermal conductivity film is 50 μm. In the long fiber substrate layer, the long fibers are organic cotton with a porosity greater than 50%, and the length of the long fibers is greater than 10 mm.

[0067] The total thickness of the heat-not-burning composite cigarette sheet is 0.35 mm. Example

[0068] 25 parts of tobacco powder, 45 parts of atomizing agent, 3 parts of binder, 7 parts of porous material, 5 parts of flavoring, and 15 parts of water were fed into a roller press and mixed evenly at a rolling speed of 3 r / min. After rolling three times, reconstituted tobacco sheet sample 3 was obtained and set aside for later use. Among them, the tobacco powder had an average mesh size of 75 mesh and was obtained by grinding tobacco fibers; the atomizing agent was a mixture of propylene glycol and glycerol in a mass ratio of 5:5; the binder was a mixture of guar gum and modified starch in a mass ratio of 2:1; the porous material was silica with an average pore size of 12 micrometers; the thermally conductive powder was a mixture of silver-coated copper powder and silver powder in a mass ratio of 1:1; and the flavoring was a tobacco flavoring.

[0069] A heat-not-burning composite cigarette sheet is prepared by corona treatment of the surface of a long fiber substrate layer at a voltage of 8kV for 4 seconds. The corona-treated long fiber substrate layer and a reconstituted tobacco sheet sample 3 are then stacked sequentially from bottom to top and placed in a roller press for rolling and pressing at a speed of 2r / min. The pressed composite layer is then peeled off from the upper roller. A high thermal conductivity film is then laminated onto the surface of the reconstituted tobacco sheet sample 3 and placed in the roller press for rolling and pressing at a speed of 1.5r / min. The pressed product is then peeled off from the upper roller and baked in a 65℃ oven for 25 minutes, followed by baking in a 110℃ oven. The moisture content of the tobacco sheet is controlled to within 8% by controlling the baking time, thus obtaining the heat-not-burning composite cigarette sheet.

[0070] Among them, the high thermal conductivity film is a graphite and carbon nanotube film; the graphite content is 92wt%, the carbon nanotube content is 8wt%, the thickness of the long fiber substrate layer is 0.2mm, the thickness of the reconstituted tobacco sheet sample 3 is 0.1mm, and the thickness of the high thermal conductivity film is 100μm. In the long fiber substrate layer, the long fibers are bamboo and hemp, with a porosity greater than 50% and a fiber length greater than 10mm.

[0071] The total thickness of the heat-not-burning composite cigarette sheet is 0.5 mm. Example

[0072] 34 parts of tobacco powder, 38 parts of atomizing agent, 4 parts of binder, 5 parts of porous material, 5 parts of thermally conductive powder, 2 parts of flavoring, and 12 parts of water were fed into a roller press and mixed evenly at a rolling speed of 3 r / min. After rolling twice, reconstituted tobacco sheet sample 4 was obtained and taken out for later use. Among them, the tobacco powder had an average mesh size of 100 mesh and was obtained by grinding tobacco fibers; the atomizing agent was a mixture of propylene glycol and glycerol in a mass ratio of 1:2; the binder was carboxymethyl cellulose; the porous material was diatomaceous earth with an average pore size of 12 micrometers; the thermally conductive powder was a mixture of aluminum nitride and boron nitride in a mass ratio of 1:1; and the flavoring was tobacco flavoring.

[0073] A heat-not-burning composite cigarette sheet is prepared by corona treatment of the surface of a long fiber substrate layer at a voltage of 5kV for 6 seconds. Then, the corona-treated long fiber substrate layer and a reconstituted tobacco sheet sample 4 are stacked sequentially from bottom to top and placed in a roller press for rolling and pressing at a speed of 8r / min. The pressed composite layer is then peeled off from the upper roller. A high thermal conductivity film is then laminated onto the surface of a reconstituted tobacco sheet sample 3 and placed in a roller press for rolling and pressing at a speed of 3r / min. The pressed product is then peeled off from the upper roller and baked in a 65℃ oven for 25 minutes, followed by baking in a 110℃ oven. The moisture content of the tobacco sheet is controlled to within 8% by controlling the baking time, thus obtaining the heat-not-burning composite cigarette sheet.

[0074] Among them, the high thermal conductivity film is a carbon whisker and graphene film; the carbon whisker content is 5wt%, the graphene content is 95wt%, the long fiber substrate layer thickness is 0.2mm, the thickness of the reconstituted tobacco sheet sample 3 is 0.1mm, and the high thermal conductivity film thickness is 100μm. In the long fiber substrate layer, the long fibers are bamboo and hemp, with a porosity greater than 50% and a fiber length greater than 10mm.

[0075] The total thickness of the heat-not-burning composite cigarette sheet is 0.5 mm. Example

[0076] 35 parts of tobacco powder, 44 parts of atomizing agent, 3 parts of binder, and 18 parts of water were fed into a roller press and mixed evenly at a rolling speed of 5 r / min. After rolling twice, reconstituted tobacco sheet sample 5 was obtained and set aside for later use. The tobacco powder had an average mesh size of 100 mesh and was obtained by grinding tobacco fibers; the atomizing agent was a mixture of propylene glycol and glycerol in a mass ratio of 3:7; and the binder was a mixture of sodium alginate and carboxymethyl cellulose in a mass ratio of 1:1.

[0077] A heat-not-burning composite cigarette sheet is prepared by corona treatment of the surface of a long fiber substrate layer at a voltage of 8kV for 10 seconds. Then, the corona-treated long fiber substrate layer and a reconstituted tobacco sheet sample 5 are stacked sequentially from bottom to top and placed in a roller press for rolling and pressing at a speed of 10r / min. The pressed composite layer is then peeled off from the upper roller. A high thermal conductivity film is then laminated onto the surface of a reconstituted tobacco sheet sample 3 and placed in a roller press for rolling and pressing at a speed of 2r / min. The pressed product is then peeled off from the upper roller and baked in a 65℃ oven for 25 minutes, followed by baking in a 110℃ oven. The moisture content of the tobacco sheet is controlled to within 8% by controlling the baking time, thus obtaining the heat-not-burning composite cigarette sheet.

[0078] Among them, the high thermal conductivity film is a silver alloy film; the thickness of the long fiber substrate layer is 0.25 mm, the thickness of the reconstituted tobacco sheet sample 3 is 0.1 mm, and the thickness of the high thermal conductivity film is 50 μm. In the long fiber substrate layer, the long fibers are bamboo and hemp, with a porosity greater than 50% and a length greater than 10 mm.

[0079] The total thickness of the heat-not-burning composite cigarette sheet is 0.5 mm. Example

[0080] 34 parts of tobacco powder, 38 parts of atomizing agent, 4 parts of binder, 5 parts of porous material, 5 parts of thermally conductive powder, 2 parts of flavoring, and 12 parts of water were fed into a roller press and mixed evenly at a rolling speed of 3 r / min. After rolling twice, 6 reconstituted tobacco sheet samples were obtained and set aside for later use. Among them, the tobacco powder had an average mesh size of 100 mesh and was obtained by grinding tobacco fibers; the atomizing agent was a mixture of propylene glycol and glycerol in a mass ratio of 1:2; the binder was carboxymethyl cellulose; the porous material was diatomaceous earth with an average pore size of 30 micrometers; the thermally conductive powder was a mixture of aluminum nitride and boron nitride in a mass ratio of 1:1; and the flavoring was a tobacco flavoring.

[0081] A heat-not-burning composite cigarette sheet is produced by corona treatment of the surface of a long-fiber substrate layer at a voltage of 5kV for 10 seconds. Then, the corona-treated long-fiber substrate layer, reconstituted tobacco sheet sample 6, and a high thermal conductivity film are stacked sequentially from bottom to top and placed in a roller press for rolling pressing at a speed of 2 r / min. The pressed composite layer is then peeled off from the upper roller. The reconstituted tobacco sheet sample 6 is then stacked on the other outer surface of the long-fiber substrate layer and placed in the roller press for rolling pressing at a speed of 3 r / min. The pressed product is then peeled off from the upper roller and baked in a 60℃ oven for 15 minutes, followed by baking in a 100℃ oven. The moisture content of the tobacco sheet is controlled to within 10% by controlling the baking time, thus obtaining the heat-not-burning composite cigarette sheet. (The pressing sequence is: first, press one side of the reconstituted tobacco sheet with the long-fiber film, dry it, then press the other side, and finally press the thermal conductivity film.)

[0082] Among them, the high thermal conductivity film is an aluminum alloy film; the thickness of the long fiber substrate layer is 0.1 mm, the thickness of the reconstituted tobacco sheet sample 1 is 0.1 mm, the thickness of the high thermal conductivity film is 50 μm, and the thickness of the reconstituted tobacco sheet sample 4 is 0.1 mm. In the long fiber substrate layer, the long fibers are cotton and linen, with a porosity greater than 50% and a length greater than 10 mm.

[0083] The total thickness of the heat-not-burning composite cigarette sheet is 0.35 mm. Example

[0084] 40 parts of tobacco powder, 35 parts of atomizing agent, 5 parts of binder, 3 parts of flavoring, and 17 parts of water were fed into a roller press and mixed evenly at a rolling speed of 4 r / min. After rolling twice, reconstituted tobacco sheet sample 7 was obtained and set aside for later use. The tobacco powder had an average mesh size of 50 mesh and was obtained by grinding tobacco fibers; the atomizing agent was a mixture of propylene glycol and glycerol in a mass ratio of 3:7; the binder was sodium carboxymethyl cellulose; and the flavoring was a tobacco flavoring.

[0085] A heat-not-burning composite cigarette sheet is prepared by stacking a long-fiber substrate layer (not corona-treated), a reconstituted tobacco sample 7, and a high thermal conductivity film in sequence from bottom to top, and then rolling and pressing them in a roller press at a rolling speed of 2 r / min. The pressed composite layer is then torn off from the upper roller, and the reconstituted tobacco sample 7 is then stacked on the other outer surface of the long-fiber substrate layer and rolled and pressed in a roller press at a rolling speed of 3 r / min. The pressed product is then torn off from the upper roller and baked in a 60°C oven for 15 minutes, followed by baking in a 100°C oven. The moisture content of the tobacco sheet is controlled to be within 10% by controlling the baking time, thus obtaining the heat-not-burning composite cigarette sheet (the pressing sequence is to first press one side of the reconstituted tobacco sheet with the long-fiber film, dry it, then press the other side, and finally press the thermal conductivity film).

[0086] Among them, the high thermal conductivity film is a tungsten-copper alloy film; the thickness of the long fiber substrate layer is 0.1 mm, the thickness of the reconstituted tobacco sheet sample 1 is 0.1 mm, and the thickness of the high thermal conductivity film is 50 μm. In the long fiber substrate layer, the long fibers are organic cotton with a porosity greater than 50%, and the length of the long fibers is greater than 10 mm.

[0087] The total thickness of the heat-not-burning composite cigarette sheet is 0.35 mm.

[0088] Meanwhile, according to Example 1, Comparative Examples 1-3 were prepared, as shown in Table 1 below:

[0089] Table 1

[0090]

[0091] The heated non-combustible composite cigarette sheets of Examples 1-7 and Comparative Examples 1-3 were subjected to the following tests.

[0092] Atomization test: Take the heat-not-burning composite cigarette sheet prepared in Example 1 (as test sample) and Comparative Example 3 (as control sample), cut it into tobacco shreds, roll it into a composite cigarette with an inner diameter of 5.7 mm and a height of 35 mm, and put it into a smoking device for atomization.

[0093] Connect the composite cigarette to the matching heating device and smoke it using a linear smoking machine according to the smoking method specified in standard YC / T29-1996. The smoking parameters are: 35 mL of smoking capacity, 2 seconds of smoking duration, and 30 seconds of smoking interval. Use a 44 mm Cambridge filter to capture the aerosol released during each puff. The specific method is as follows: (1) First, prepare 40 blank Cambridge filters of 44 mm and put them into 40 aerosol traps. Make them numbered and weigh them one by one. Prepare 40 suction channels (suck in 2 rounds, 20 suction channels in each round); (2) Take the sample cigarette and take a puff on the first trap. Then take the sample cigarette out and quickly transfer it to the second trap to continue sucking for the second puff. Continue in this way until the 40th trap is transferred and the 40th puff is taken. The sample cigarette is then finished being sucked; (3) Weigh each trap after sucking and record the weight increase of each trap. When the weight increase is not obvious, it can be considered that the sample cigarette can no longer be atomized and therefore cannot produce aerosol.

[0094] The test results obtained are as follows Figure 4As shown, based on the progressive weight gain of the trap, the trap gained weight after the 29th puff of the test sample, indicating a sharp decrease in aerosol release at that puff sequence. This suggests that the effective number of puffs (i.e., the puff sequence) for the test sample was 28. Similarly, the weight gain of the trap decreased sharply after the 20th puff of the control sample, indicating that the effective number of puffs for the control sample was 19. This experiment demonstrates that the composite cigarette made using the heat-not-burn composite cigarette sheet of this invention has a significantly higher number of atomized puffs than conventional products currently on the market. Furthermore, the results in the figure above also show that the aerosol release of the test sample reached a stable state after the 2nd puff, while the control sample only reached a stable state after the 5th puff, indicating that the atomization efficiency of the composite cigarette using this invention is higher than that of conventional products currently on the market.

[0095] Thermal conductivity test: Take the heated non-combustible composite cigarette sheets prepared in Examples 1-6, place them on the same heating grid, connect the heating grid to the power supply, apply the same power to heat, and test the smoking time. The shorter the heating time, the better the thermal conductivity, or the higher the temperature within the same time, the better the thermal conductivity.

[0096] Strength test: The heat-not-burning composite cigarette sheets prepared in Examples 1, 7 and Comparative Examples 1-2 were subjected to peel strength test (testing the peel strength between the cigarette sheet and the long fiber substrate layer in the heat-not-burning composite cigarette sheet) and tensile strength test (testing the tensile strength of the heat-not-burning composite cigarette sheet).

[0097] The results of the thermal conductivity and strength tests are shown in Table 2-3 below:

[0098] Table 2

[0099]

[0100] Table 3

[0101]

[0102] As shown in Table 2, the smoking time of the heated tobacco sheets in Examples 1-6 is all less than or equal to 16 seconds, and the surface temperature of the tobacco sheets is greater than 165°C after 15 seconds. In contrast, the smoking time of conventional heated tobacco sheets (similar to Comparative Example 3, with a thickness of 0.35 mm) is generally around 20-25 seconds; within 15 seconds, the surface temperature of conventional heated tobacco sheets is around 150-155°C. Therefore, the thermal conductivity of the heated tobacco sheets in Examples 1-6 is superior to that of conventional heated tobacco sheets, indicating a significant improvement in thermal conductivity compared to existing conventional heated tobacco sheets.

[0103] Meanwhile, as shown in Table 2, since thermally conductive powder was added to the reconstituted tobacco sheet samples of Examples 2, 4 and 6, while no thermally conductive powder was added to the reconstituted tobacco sheet samples of Examples 1, 3 and 5, the thermal conductivity of the heated non-combustible composite cigarette sheets of Examples 2, 4 and 6 is better than that of the heated non-combustible composite cigarette sheets of Examples 1, 3 and 5.

[0104] As shown in Table 3, the peel strength of the heated tobacco sheet of Example 1 is significantly greater than that of the heated tobacco sheet of Example 7, indicating that the peel strength between the tobacco sheet and the long fiber substrate layer is significantly increased after corona treatment. The tensile strength of the heated tobacco sheet of Example 1 is significantly greater than that of the heated tobacco sheets of Comparative Examples 1 and 2, indicating that when the length of the long fibers in the long fiber substrate layer is too short, the structural strength of the heated tobacco sheet will be poor; moreover, within a certain range, the longer the length of the long fibers in the long fiber substrate layer, the higher its structural strength.

[0105] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0106] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A heat-not-burn composite cigarette sheet, characterized in that, It includes reconstituted tobacco sheets and a long fiber substrate layer. The reconstituted tobacco sheets are disposed on the surface of the long fiber substrate layer. The long fiber substrate layer has a porous structure, and the length of the long fibers in the long fiber substrate layer is greater than 10 mm. The porosity of the long fiber substrate layer is greater than 50%. It also includes a high thermal conductivity film disposed on the surface of the reconstituted tobacco sheet; the high thermal conductivity film is made of one or more of the following materials: metal, alloy, and carbon-based substances; the metal is one of aluminum, copper, magnesium, zinc, silver, and tungsten; the alloy is one or more of the following materials: aluminum alloy, copper alloy, magnesium alloy, zinc alloy, silver alloy, and tungsten alloy; and the carbon-based substance is one or more of the following materials: graphite, carbon black, carbon nanotubes, graphene, and carbon whiskers. The reconstituted tobacco sheet comprises, by weight, the following components: 25-40 parts tobacco powder, 35-50 parts atomizing agent, 1-5 parts binder, 0-7 parts porous material, 0-7 parts thermally conductive powder, 0-5 parts flavoring, and 10-18 parts water; the tobacco powder has an average mesh size of 50-100 mesh and is obtained by grinding tobacco fibers. The preparation method of the heated non-combustible composite cigarette sheet includes the following steps: Pretreatment: The surface of the long fiber substrate layer is subjected to corona treatment; Co-pressing: After stacking the long fiber substrate layer and the reconstituted tobacco sheet, the layers are rolled and pressed together, and then dried to obtain a heat-not-burn composite cigarette sheet.

2. The heat-not-burn composite cigarette sheet as described in claim 1, characterized in that, The thickness of the reconstituted tobacco sheet is 0.08-0.2 mm, and the thickness of the long fiber substrate layer is 0.02-0.3 mm.

3. The heat-not-burn composite cigarette sheet as described in claim 1, characterized in that, The thickness of the high thermal conductivity film is 5-100 μm.

4. The heat-not-burn composite cigarette sheet as described in claim 1, characterized in that, The atomizing agent is one or a mixture of two of propylene glycol and glycerol; the binder is one or a mixture of more than one of carboxymethyl cellulose, sodium alginate, guar gum, modified starch, xanthan gum, and gum arabic; the porous material is one or a mixture of more than one of silica, diatomaceous earth, and alumina; and the thermally conductive powder is one or a mixture of more than one of aluminum nitride, boron nitride, silver-plated copper, aluminum-plated copper, copper powder, aluminum powder, and silver powder.

5. The heat-not-burn composite cigarette sheet as described in claim 1, characterized in that, The method for preparing the heated non-combustible composite cigarette sheet further includes re-pressing, whereby a layer of reconstituted tobacco sheet is stacked on the surface of the heated non-combustible composite cigarette sheet that does not contain reconstituted tobacco sheet, and then rolled and pressed to obtain a heated non-combustible composite cigarette sheet whose surface contains reconstituted tobacco sheet.

6. A composite cigarette, characterized in that, Includes the heated non-combustible composite cigarette sheet as described in any one of claims 1-5.

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