WO2025000495A1 - Preparation method of loading piece and aerosol generating product containing loading piece - Google Patents

Abstract

The present invention relates to a preparation method of a loading piece and an aerosol generating product containing the loading piece, the aerosol generating product comprises a composite cigarette core segment, the composite cigarette core segment comprises an aerosol generating matrix and the loading piece rolled together, the loading piece comprises a substrate, the substrate carries a loading substance, and the heat release temperature of the loading substance is lower than the pyrolysis temperature of the substrate; the preparation method comprises: S1, weighing raw materials; S2, preparing an initial slurry; S3, preparing a mixed slurry; and S4, preparing the loading piece. The present invention effectively reduces the amount of impurities and mixed gases in the aerosol generated by the composite cigarette core, improves the release efficiency of the aerosol generator, and is conducive to the increase of the amount of aerosol generated. At the same time, the preparation method is simple and feasible, the production cost is low, and large-scale production can be achieved.

Description

A method for preparing a carrier and an aerosol generating product comprising the carrier Technical Field

The present invention relates to the field of heat-without-combustion technology, and in particular to a method for preparing a carrier and an aerosol generating product comprising the carrier.

Background Art

In the heat-not-burn industry, aerosol-generating products are mostly wrapped in wrapping paper, and the main components of wrapping paper include calcium carbonate, cellulose, lignin, hemicellulose, etc. The heating methods of aerosol-generating products on the market currently include circumferential heating and bottom heating. Since the use temperature of the tobacco core section of aerosol-generating products is generally high, in this case, when the heat source is arranged at the circumference or bottom of the tobacco core section, the heat is transferred to the aerosol-generating matrix inside the wrapping paper, so the heat is inevitably partially absorbed by the wrapping paper, resulting in the heat not being effectively used to generate aerosols, and even causing serious pyrolysis of hemicellulose or cellulose in the wrapping paper, releasing a large amount of impurities and miscellaneous gases, resulting in the generated aerosol mixed with impurities and miscellaneous gases, giving consumers a poor sensory experience.

Summary of the invention

The technical problem to be solved by the present invention is to provide a method for preparing a carrier and an aerosol generating product comprising the carrier.

The technical solution adopted by the present invention to solve its technical problems is: an aerosol generating product, including a composite cigarette core segment, the composite cigarette core segment includes an aerosol generating matrix and a load member rolled together, the load member includes a substrate, the substrate carries a load substance, and the heat release temperature of the load substance is lower than the pyrolysis temperature of the substrate.

Preferably, the substrate is in sheet form, the substrate is rolled into a tube shape, and the aerosol generating matrix is filled in the area surrounded by the tube-shaped substrate.

Preferably, the substrate is in sheet form, the substrate is integrally wound into a spiral tube, and the aerosol generating matrix is filled in the area surrounded by the tubular substrate.

Preferably, the substrate is in sheet form, a plurality of substrates are sequentially connected to form a tube, and the aerosol generating matrix is filled in the area surrounded by the tube-shaped substrate.

Preferably, the substrate is in sheet shape, the aerosol generating substrate is in sheet shape, the surface of the aerosol generating substrate and/or the supporting member has texture, the supporting member and the aerosol generating substrate are wound together, and the texture forms a ventilation space.

Preferably, the substrate is in a sheet shape, and the aerosol generating matrix and the substrate are randomly mixed to form a tube shape.

Preferably, the loading substance comprises glycerol and/or propylene glycol.

Preferably, the composite cigarette core segment further comprises wrapping paper, which wraps the outer side of the aerosol generating substrate and the carrier rolled together.

A method for preparing a carrier of an aerosol generating product comprises the following steps:

S1. Weigh raw materials: weigh 25-46 parts of plant fiber, 2-6 parts of adhesive, 20-50 parts of aerosol generator, 10-40 parts of thermal conductive filler and 0.23-0.47 parts of preparation aids, wherein the preparation aids include 0.15-0.25 parts of dry strength agent, 0.05-0.15 parts of wet strength agent and 0.03-0.07 parts of retention aid;

The plant fiber includes at least one of wood pulp fiber, straw pulp fiber and hemp pulp fiber, the binder includes at least one of cellulose derivatives, sodium alginate, starch, pectin, guar gum, gum, chitosan, dextran, carrageenan and calcium carbonate, and the aerosol generator includes glycerol and/or propylene glycol;

The thermal conductive filler includes at least one of a metal filler, a ceramic filler and a carbon material; the metal filler includes at least one of Al, Cu, Ag and Au; the ceramic filler includes at least one of Al ₂ O ₃ , MgO, BN and Si ₃ N ₄ ; the carbon material includes at least one of graphite, graphene, reduced graphene oxide, carbon nanotubes, carbon fiber and diamond;

The dry strength agent is anionic amphoteric polyacrylamide, the wet strength agent is polyamide epichlorohydrin resin, and the retention agent is cationic polyacrylamide;

S2. preparing an initial slurry: pretreating the plant fiber, then adding water to pulp and periodically measuring the pulping degree to obtain an initial slurry;

S3, preparing a mixed slurry: adding a thermal conductive filler to the slurry, mixing and defiberizing, then adding a dry strength agent and stirring for the first time, adding an aerosol generator, a binder and a wet strength agent and stirring for the second time, then adding a retention agent and stirring for the third time to obtain a mixed slurry;

S4. Prepare a load member: sheet the mixed slurry, press and dry it to obtain a substrate, make the substrate carry the load substance, and dry it to obtain a load member, wherein the content of the aerosol generating agent in the load member is 20-50wt%.

Preferably, in step S2, the plant fiber is soaked in 3-7 L of water for 3-7 h, and then 15-20 L of water is added for pulping until the pulp has a beating degree of 30-38° SR;

In step S3, the rotation speed of fiber decomposition is 8000-15000r; the first stirring is stirring at 500-1500rpm for 3-7min, the second stirring is stirring at 300-1000rpm for 3-7min, and the third stirring is stirring at 300-1000rpm for 3-7min;

In step S4, the mixed slurry is sheeted and pressed at a pressure of 300-500 kPa for 2-4 minutes, and then dried at 30-50° C. for 4-6 hours to obtain a substrate; the substrate is loaded with a loading substance solution containing 1-3 wt% of a thickener, and dried at room temperature for 1.5-2.5 hours, and finally dried at 30-50° C. for 10-14 hours to obtain a loading part;

The loading material includes glycerol and/or propylene glycol; the binder and the thickener both include nanocellulose, and the diameter of the nanocellulose is 30-40nm and the weight average length is 1.8-2.5mm.

The implementation of the present invention has the following beneficial effects:

The aerosol generating product of the present invention includes a composite cigarette core segment, and the composite cigarette core segment includes an aerosol generating matrix and a load member rolled together, and the load member includes a substrate, and the substrate carries a load substance, and the heat release temperature of the load substance is lower than the pyrolysis temperature of the substrate. When the composite cigarette core segment is heated, the aerosol generating matrix releases the matrix substance when heated, and the load substance carried on the substrate is also released when heated, and the two are mixed to form an aerosol that can be used for inhalation. Among them, the heat release temperature of the load substance is lower than the pyrolysis temperature of the substrate. In the process of heating and heating, the load substance is released before the substrate, so that the substrate cannot reach its pyrolysis temperature or the time for the substrate to reach the pyrolysis temperature is delayed, thereby reducing or avoiding the mixing of impurities and miscellaneous gases generated by the pyrolysis of the substrate with the released matrix substance, and effectively reducing the amount of impurities and miscellaneous gases in the generated aerosol.

In the preparation method of the carrier of the aerosol generating product of the present invention, an aerosol generating agent is added during the pulping process and the substrate is loaded with a loading substance to obtain a carrier with a certain content of aerosol generating agent, which reduces impurities and improves the release efficiency of the aerosol generating agent, thereby facilitating the increase of the aerosol generation amount of the composite cigarette core segment, thereby improving the user's satisfaction and comfort when using the aerosol generating matrix product. At the same time, the preparation method is simple and feasible, the production cost is low, and large-scale production can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

FIG1 is a schematic diagram of the cross-sectional structure of a composite cigarette core segment of Example 1-1 of the present invention;

FIG2 is a schematic diagram of the cross-sectional structure of the composite cigarette core segment of Example 1-2 of the present invention;

FIG3 is a schematic diagram of the cross-sectional structure of the composite cigarette core segment of Example 1-3 of the present invention;

FIG4 is a schematic diagram of the cross-sectional structure of the composite cigarette core segment of Examples 1-4 of the present invention;

FIG5 is a schematic diagram of the cross-sectional structure of the composite cigarette core segment of Example 1-5 of the present invention;

FIG6 is a schematic diagram of the cross-sectional structure of the composite cigarette core segment of Examples 1-6 of the present invention;

FIG7 is a schematic diagram of the cross-sectional structure of a composite cigarette core segment according to some embodiments of the present invention;

FIG8 is a schematic diagram of the longitudinal cross-sectional structure of the composite cigarette core segment shown in FIG7.

DETAILED DESCRIPTION

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

Embodiment 1, an aerosol generating product, including a composite cigarette core segment, as shown in Figures 1 to 8, the composite cigarette core segment includes an aerosol generating matrix and a load member rolled together, the load member includes a substrate, the substrate carries a load substance, the thermal release temperature of the load substance is lower than the thermal decomposition temperature of the substrate, so that the load substance is released before the substrate is heated, avoiding thermal decomposition of the substrate. The substrate carries the load substance, and the loading method includes but is not limited to coating, impregnation, etc. The load substance includes glycerol and/or propylene glycol in some embodiments.

In some embodiments, the substrate is in the form of a sheet, the substrate is integrally wound into a tubular shape, and the aerosol generating matrix is filled in the area surrounded by the tubular substrate. Specifically, the carrier is arranged on the periphery of the aerosol generating substrate, and the arrangement method can be attached, and the carrier is wound around the aerosol generating substrate, and the number of winding layers is 1-4 layers; or, the substrate is in the form of a sheet, the substrate is integrally wound into a spiral tube, and the aerosol generating matrix is filled in the area surrounded by the tubular substrate. Specifically, the aerosol generating matrix is laid on the inner wall and/or outer wall of the carrier, and the aerosol generating matrix is pre-fixed on at least one side of the carrier, and the carrier itself is wound into a spiral tube; or, the substrate is in the form of a sheet, and multiple substrates are sequentially connected to form a tube, and the aerosol generating matrix is filled in the area surrounded by the tubular substrate.

In some embodiments, the substrate is in sheet form, and the aerosol generating substrate and the substrate are randomly mixed in a tubular shape. As shown in Figures 7 and 8, a composite cigarette core segment of an aerosol generating product includes a support member 71, an aerosol generating substrate 72, and a wrapping paper 73, wherein the aerosol generating substrate 72 is at least one of filamentary, granular, or powdery, the support member 71 and the aerosol generating substrate 72 are randomly mixed in a tubular shape, and the wrapping paper 73 is arranged on the periphery of the aerosol generating substrate 72, thereby forming a tubular composite cigarette core segment.

Wherein, the above-mentioned aerosol generating matrix is at least one of filament, granular, sheet or powder, and correspondingly, the aerosol generating matrix includes at least one of tobacco shreds, stem shreds, expanded tobacco shreds, expanded stem shreds, tobacco particles, tobacco flakes, and tobacco powder. When the aerosol generating matrix is laid on the load member, the arrangement mode and density of the aerosol generating matrix on the load member can be selected according to actual needs, and the present invention does not limit it; especially when the aerosol generating matrix is in sheet form, it is a discontinuous structure, that is, the aerosol generating matrix can include a number of tobacco flakes arranged at intervals, or the aerosol generating matrix has a hollow structure. In short, it is preferred that the aerosol generating matrix does not completely cover the load member to ensure the overall air permeability of the composite cigarette core segment.

In some embodiments, the substrate is in sheet form, the aerosol generating substrate is in sheet form, the surface of the aerosol generating substrate and/or the support member has textures, the support member and the aerosol generating substrate are wound together, and the textures form ventilation spaces. The aerosol generating substrate and/or the support member are formed with textures on their surfaces by a deep embossing machine or a refractive embossing machine, and the embossing depth is between 0.2 and 0.8 mm. The air permeability of the embossed aerosol generating substrate is 0 to 100 CU, the air permeability of the embossed support member is 0 to 20 CU, and the air permeability of the aerosol generating substrate and the support member is not 0 at the same time.

In other embodiments, the composite cigarette core segment further includes wrapping paper, which is wrapped around the outside of the aerosol generating substrate and the carrier member rolled together. Specifically, the wrapping paper is arranged on the periphery of the carrier member or the aerosol generating substrate, and the arrangement method can be attached.

In some embodiments, the above-mentioned aerosol generating product comprises a composite cigarette core segment, a cooling segment and a filter segment arranged in sequence in the axial direction, wherein the shape of the composite cigarette core segment includes but is not limited to a cylindrical shape, a block shape, etc. The cooling segment is located between the composite cigarette core segment and the filter segment, and the composite cigarette core segment is used to generate aerosol by being heated. The generated high-temperature aerosol flows through the cooling segment and is cooled to a certain extent before being absorbed by the user through the filter segment.

Understandably, in the present invention, when the composite cigarette core segment is heated, the aerosol-generating matrix releases the matrix material when heated, and the load material carried on the substrate is also released when heated, and the two are mixed to form an aerosol that can be used for inhalation. Among them, the thermal release temperature of the load material is lower than the pyrolysis temperature of the substrate. In the process of heating and heating, the load material is released by heat before the substrate, so that the substrate cannot reach its pyrolysis temperature or delays the time for the substrate to reach the pyrolysis temperature, thereby reducing or avoiding the impurities and miscellaneous gases generated by the pyrolysis of the substrate and mixing with the released matrix material, effectively reducing the amount of impurities and miscellaneous gases in the generated aerosol. In addition, when the load material includes glycerol and/or propylene glycol, the amount of aerosol generated can also be increased, thereby improving the user's inhalation taste.

The following is a detailed description through specific embodiments:

Embodiment 1-1, an aerosol generating product, including a composite cigarette core segment, as shown in FIG1, the composite cigarette core segment includes a load member 11 and an aerosol generating matrix 12, the load member 11 includes a substrate, the substrate carries a load substance, and the thermal release temperature of the load substance is lower than the thermal decomposition temperature of the substrate. Among them, the aerosol generating matrix 12 is at least one of filamentous, granular, flaky or powdery, and the load member 11 is arranged on the periphery of the aerosol generating matrix 12, so as to form a composite cigarette core segment. In this case, since the load substance is released before the substrate is heated, the substrate does not reach its thermal decomposition temperature, thereby avoiding the generation of impurities and miscellaneous gases by thermal decomposition of the substrate. At the same time, since the substrate carries the load substance, when the composite cigarette core segment is heated, the aerosol generating matrix 12 and the load member 11 can both release the precursor components of the aerosol, thereby improving the release efficiency of the aerosol.

Embodiment 1-2, an aerosol generating product, including a composite cigarette core segment, as shown in FIG2, the composite cigarette core segment includes a load 21, an aerosol generating matrix 22 and a wrapping paper 23, the load 21 includes a substrate, the substrate carries a load substance, and the thermal release temperature of the load substance is lower than the pyrolysis temperature of the substrate. Wherein, the aerosol generating matrix 22 is at least one of filamentous, granular, flaky or powdery, the load 21 is arranged on the periphery of the aerosol generating matrix 22, and the wrapping paper 23 is arranged on the periphery of the load 21, thereby forming a composite cigarette core segment. Wherein, the load 21 is wound around the periphery of the aerosol generating matrix 22 to accommodate the aerosol generating matrix 22, and the number of winding layers is 1-4 layers, preferably 2 layers. In this case, the load 21 is arranged between the wrapping paper 23 and the aerosol generating matrix 22. Since the load substance on the load 21 is released by heat before the substrate and the wrapping paper 23, the problem that the wrapping paper is susceptible to pyrolysis is solved, and the substrate and the wrapping paper are prevented from pyrolyzing and producing impurities and miscellaneous gases. In other embodiments, an aerosol generating matrix is further provided between the wrapping paper 23 and the supporting member 21 to increase the aerosol generating agent content of the composite cigarette core segment, which is beneficial to increase the release amount of the aerosol and reduce the impurities and miscellaneous gases in the aerosol.

Embodiment 1-3, an aerosol generating product, including a composite cigarette core segment, as shown in FIG3, the composite cigarette core segment includes a carrier 31, an aerosol generating matrix 32 and a wrapping paper 33, the carrier 31 includes a substrate, the substrate carries a load substance, and the thermal release temperature of the load substance is lower than the pyrolysis temperature of the substrate. Wherein, the aerosol generating matrix 32 is at least one of filament, granular, sheet or powder, the carrier 31 and the aerosol generating matrix 32 are wound together, and the carrier 31 is laid on the outer wall of the aerosol generating matrix 32, and the wrapping paper 33 is arranged on the periphery of the carrier 31, thereby forming a composite cigarette core segment. The aerosol generating matrix 32 is pre-fixed on at least one side of the carrier 31, that is, the aerosol generating matrix 32 is fixed on any one side (that is, the inner wall or the outer wall) or both sides of the carrier 31, and the fixing method includes but is not limited to adhesion. In this embodiment, the aerosol generating substrate 32 is fixed to one side of the carrier 31, and the carrier 31 is wound around itself, alternating with the aerosol generating substrate 32, so that the outer wall of the carrier 31 is in contact with the wrapping paper 33. In some embodiments, the composite cigarette core segment may be cylindrical in shape.

Embodiment 1-4, an aerosol generating product, including a composite cigarette core segment, as shown in FIG4, the composite cigarette core segment includes a carrier 41, an aerosol generating matrix 42 and a wrapping paper 43, the carrier 41 includes a substrate, the substrate carries a load substance, and the thermal release temperature of the load substance is lower than the pyrolysis temperature of the substrate. Among them, the aerosol generating matrix 42 is at least one of filament, granular, sheet or powder, the carrier 41 and the aerosol generating matrix 42 are wound together, and the carrier 41 is laid on the inner wall of the aerosol generating matrix 42, and the wrapping paper 43 is arranged on the periphery of the aerosol generating matrix 42, thereby forming a composite cigarette core segment. In this embodiment, the aerosol generating matrix 42 is fixed on one side of the carrier 41, and the carrier 41 itself is wound, and the aerosol generating matrix 42 is alternately spaced, so that the outer wall of the aerosol generating matrix 42 is in contact with the wrapping paper 43.

Embodiment 1-5, an aerosol generating product, including a composite cigarette core segment, as shown in FIG5, the composite cigarette core segment includes a load member 51, an aerosol generating matrix 52 and a wrapping paper 53, the load member 51 includes a substrate, the substrate carries a load substance, and the thermal release temperature of the load substance is lower than the thermal decomposition temperature of the substrate. Among them, the aerosol generating matrix 52 is at least one of filament, granular, sheet or powder, the load member 51 and the aerosol generating matrix 52 are wound together, and the load member 51 is laid on the inner wall and outer wall of the aerosol generating matrix 52, and the wrapping paper 53 is arranged on the periphery of the aerosol generating matrix 52, thereby forming a composite cigarette core segment. In this embodiment, the aerosol generating matrix 52 is fixed on both sides of the load member 51, and the load member 51 is wound by itself, and alternates with the aerosol generating matrix 52, so that the outer wall of the aerosol generating matrix 52 is in contact with the wrapping paper 53.

Embodiment 1-6, an aerosol generating product, including a composite cigarette core segment, as shown in FIG6, the composite cigarette core segment includes a carrier 61, an aerosol generating matrix 62 and a wrapping paper 63, the carrier 61 includes a substrate, the substrate carries a load substance, and the heat release temperature of the load substance is lower than the pyrolysis temperature of the substrate. Among them, the aerosol generating matrix 62 is sheet-shaped, the surfaces of the aerosol generating matrix 62 and the carrier 61 are both textured, the carrier 61 and the aerosol generating matrix 62 are wound together, and the texture forms a ventilation space, the carrier 61 is laid on the outer wall of the aerosol generating matrix 62, and the wrapping paper 63 is arranged on the periphery of the carrier 61, thereby forming a composite cigarette core segment. In this embodiment, the aerosol generating matrix 62 can be a tobacco sheet, the aerosol generating matrix 62 and the carrier 61 are both sheet-shaped, the aerosol generating matrix 62 is fixed on both sides of the carrier 61, the carrier 61 is wound by itself, and the aerosol generating matrix 62 is alternately spaced, so that the outer wall of the carrier 61 is in contact with the wrapping paper 63. In other embodiments, only the surface of the aerosol-generating substrate is textured, or only the surface of the support member is textured.

Furthermore, the aerosol generating matrix 62 and the load member 61 are embossed by a deep embossing machine or a refractive embossing machine at a working pressure of 40-60t for 100-200ms, and the embossing depth is 0.2-0.8mm, and the surface of the aerosol generating matrix 62 and the load member 61 is formed with lines to achieve a wrinkled surface, which can increase the gap between the two to achieve uniform distribution of the aerosol generating matrix 62 and the load member 61 in the cigarette core and suitable draw resistance. Specifically, the shape of the surface lines of the aerosol generating matrix 62 and/or the load member 61 includes but is not limited to straight threads and flower threads, wherein the tooth width of the straight thread is between 0.8 and 1.2mm, and the embossing depth is between 0.4 and 0.6mm; the tooth width of the flower thread is between 1.2 and 1.8mm, and the embossing depth is between 0.2 and 0.4mm. It can be understood that the specific process conditions of the embossing treatment (including embossing pressure, embossing time, embossing shape, embossing size, etc.) can be selected according to actual needs, and the present invention is not limited thereto, and only the present invention needs to be applied.

The aerosol generating matrix 62 and the load member 61 can be divided into two forms: dense and non-dense. The density of the sheet can be adjusted in the following three ways: The first is to adjust the plant fiber composition used for pulping. For the load member, short glass fiber and broad-leaved wood fiber are used instead of longer coniferous wood fiber during pulping to improve the air permeability. The second is to adjust the preparation process. For the aerosol generating matrix 62, the air permeability of tobacco sheets made by dry papermaking is much greater than that of thick pulp sheets, wet papermaking sheets and roller-rolled sheets; for the load member 61, reducing the beating degree during pulping can also improve the air permeability. The third is to use a post-processing process to process the sheet, such as embossing, stretching, and shearing, so that the fibers in the sheet are separated and gaps are introduced, thereby significantly improving its air permeability.

In this embodiment, the air permeability of the embossed aerosol generating matrix 62 is 0-100CU, the air permeability of the embossed support member 61 is 0-20CU, and the air permeability of the aerosol generating matrix 62 and the support member 61 is not 0 at the same time. Therefore, both the aerosol generating matrix and the support member have suitable air permeability, which is beneficial to the flow of smoke in the composite cigarette core segment. When the aerosol generating matrix 62 and the support member 61 with different air permeabilities are applied to heat-not-burn (HNB) aerosol generating products, they can adapt to different air intake directions. For dense sheets, the air intake direction can be the bottom, and for non-dense sheets, the air intake direction can be the bottom or circumferential. The difference in the above air intake methods will be conducive to adapting to different types of heaters.

Embodiment 2, a method for preparing a carrier in a composite cigarette core segment of the above-mentioned aerosol generating product, comprising the following steps:

S1. Weigh the raw materials: 25-46 parts of plant fiber, 2-6 parts of adhesive, 20-50 parts of aerosol generator, 10-40 parts of thermal conductive filler and 0.23-0.47 parts of preparation aids, wherein the preparation aids include 0.15-0.25 parts of dry strength agent, 0.05-0.15 parts of wet strength agent and 0.03-0.07 parts of retention agent.

Plant fibers include at least one of wood pulp fibers, grass pulp fibers and hemp pulp fibers. The sources of plant fibers include but are not limited to wood, grass, cotton, tobacco, algae or other plants. The sources of wood pulp fibers include but are not limited to coniferous wood pulp and broadleaf wood pulp. The sources of grass pulp fibers include but are not limited to straw and sedge. The sources of hemp pulp fibers include but are not limited to hemp, flax and sisal.

The adhesive includes at least one of cellulose derivatives, sodium alginate, starch, pectin, guar gum, gum, chitosan, dextran, carrageenan, and calcium carbonate, wherein the cellulose derivative includes carboxymethyl cellulose (CMC) and nanocellulose, and the nanocellulose includes nanofibrillated cellulose and micro-nano cellulose.

Aerosol generating agents include glycerol and/or propylene glycol.

The thermally conductive filler includes at least one of a metal filler, a ceramic filler and a carbon-based material, wherein the metal filler includes at least one of Al, Cu, Ag and Au; the ceramic filler includes at least one of Al ₂ O ₃ , MgO, BN and Si ₃ N ₄ ; and the carbon-based material includes at least one of graphite, graphene, reduced graphene oxide, carbon nanotubes, carbon fiber and diamond.

In the preparation of the auxiliary agent, the dry strength agent is anionic amphoteric polyacrylamide, the wet strength agent is polyamide epichlorohydrin resin, and the retention agent is cationic polyacrylamide.

S2. Preparing initial slurry: pretreating the plant fiber, then adding water to pulp and regularly measuring the beating degree to obtain initial slurry. Specifically, soaking the plant fiber in 3-7L water for 3-7h, then adding 15-20L water (room temperature) to pulp until the pulp has a beating degree of 30-38°SR.

S3, preparing mixed slurry: adding thermal conductive filler to the slurry, mixing and fiber decomposing, then adding dry strength agent and stirring for the first time, adding aerosol generator, adhesive and wet strength agent and stirring for the second time, then adding retention agent and stirring for the third time, to obtain mixed slurry. Specifically, the number of revolutions for fiber decomposition is 8000-15000r; the first stirring is stirring at 500-1500rpm for 3-7min, the second stirring is stirring at 300-1000rpm for 3-7min, and the third stirring is stirring at 300-1000rpm for 3-7min.

S4, preparation of a load part: the mixed slurry is sheeted, pressed and dried to obtain a substrate, the substrate is loaded with a load substance, and a load part is obtained after drying, and the content of the aerosol generator in the load part is 20-50wt%. By loading the substrate with a load substance, the load substance includes glycerol and/or propylene glycol, and the loading method includes but is not limited to coating, impregnation, etc., so as to obtain a load part with a certain content of aerosol generator. Among them, the content of aerosol generator refers to the content of glycerol and/or propylene glycol, which actually includes the content of the aerosol generator added in step S3 and the content of the load substance added in step S4 in the present invention. In some embodiments, the composition of the load substance and the aerosol generator is consistent.

Specifically, in step S4, the mixed slurry is sheeted and pressed at a pressure of 300-500 kPa for 2-4 minutes, followed by a first drying at 30-50°C for 4-6 hours to obtain a substrate; the substrate is loaded with a loading substance solution containing 1-3 wt% of a thickener, and a second drying is performed at room temperature for 1.5-2.5 hours, and finally a third drying is performed at 30-50°C for 10-14 hours to obtain a loading part. The content of the aerosol generator in the loading part can be 20-50 wt%, which is not specifically limited in the present invention.

There are two ways to add the aerosol generator (glycerol/propylene glycol) to the load element. The first is to add it during the pulping process, and the second is to add it on the substrate. The second way of adding refers to the wetting behavior of glycerol/propylene glycol on the surface of the substrate, such as coating, dipping, etc. In some embodiments, a coating addition method is adopted to coat the surface of the substrate with a load substance solution (glycerol emulsion/propylene glycol solution) containing 1-3wt% thickener. The coating can be single-sided coating or double-sided coating, the coating amount is 10-40g/ ^m2 , and the coating speed is 1-5m/min. The present invention combines the two adding methods, adds the aerosol generator (glycerol/propylene glycol) during the pulping process to obtain the substrate, and makes the substrate carry the load substance (glycerol/propylene glycol).

In some embodiments, both the binder and the thickener include nanocellulose, and the diameter of the nanocellulose is 30-40 nm and the weight average length is 1.8-2.5 mm. The thickener may also be other cellulose thickeners.

In the preparation method of the load part of the present invention, plant fibers constitute the main components of the load part, the adhesive bonds the fibers to form the load part during the molding process, the aerosol generator is added into the slurry and added to the load to ensure that the load part can release the precursor components of the aerosol under the action of heat, and the addition of thermally conductive fillers improves the thermal conductivity of the load part, so that the heat from the heater is more quickly transferred to the aerosol generator material, which is beneficial to reduce impurities and miscellaneous gases in the generated aerosol, while reducing production costs.

The above-mentioned preparation method was adopted to prepare the load members of Examples 2-1 to 2-7, and the specific process parameters are shown in Tables 1 to 3, wherein the raw materials of the load members and their mass fractions are shown in Table 1; the process parameters for preparing the initial slurry and the mixed slurry in steps S2 and S3 of the preparation method are shown in Table 2, and the process parameters for preparing the load members in step S4 are shown in Table 3.

According to the TG (thermogravimetric analysis) test, the glycerol content of the support member of Example 2-1 is 21.5 wt %, and the glycerol content of the support member of Example 2-2 is 47.2 wt %.

Comparative test:

The load members of Example 2-1 and Example 2-2 were respectively combined with an aerosol generating matrix to prepare a cigarette core segment sample, whose structure was the same as the composite cigarette core segment of the aerosol generating product of Example 1-1, and the release rate of the aerosol generating matrix of the cigarette core segment sample when heated was tested.

Experimental Example 1: The aerosol-generating matrix was wrapped with the carrier of Example 2-1 to prepare a columnar cigarette core segment sample 1 with a height of 12 mm and a diameter of less than 8 mm. The aerosol-generating matrix was a plurality of thick slurry sheets containing 20 wt% glycerol and 2 wt% nicotine arranged vertically. The dimensions of the carrier were 25 mm*12 mm*0.13 mm, and the density was 0.677 g/cm ³ ; the dimensions of the thick slurry sheets were 1 mm*12 mm*0.2 mm, and the density was 1.020 g/cm ³ . The total number of the sheets was 120.

Experimental Example 2: The carrier of Example 2-2 was used to wrap the aerosol-generating matrix, thereby preparing a columnar cigarette core segment sample 2 with a height of 12 mm and a diameter of less than 8 mm. The aerosol-generating matrix was a plurality of thick slurry sheets containing 20 wt% glycerol and 2 wt% nicotine arranged vertically. The size of the carrier was 25 mm*12 mm*0.13 mm, and the density was 0.677 g/cm ³ ; the size of the thick slurry sheets was 1 mm*12 mm*0.2 mm, and the density was 1.020 g/cm ³ , and the total number was 120.

Comparative Example: The aerosol generating substrates were combined to form a columnar cigarette core segment sample 3 with a height of 12 mm and a diameter of less than 8 mm. The aerosol generating substrates were a plurality of thick slurry sheets containing 20 wt% glycerol and 2 wt% nicotine arranged longitudinally. The size of the thick slurry sheets was 1 mm*12 mm*0.2 mm, the density was 1.020 g/cm ³ , and the total number was 120.

Test equipment: Gas chromatography furnace

Test method:

(1) The temperature was set at 330°C, and the core segment samples of Experimental Example 1, Experimental Example 2 and the comparative example were respectively placed in the sample tube for circumferential heating to completely release the glycerin and nicotine in the samples. The glycerin and nicotine contents in the smoke were detected, and the values were taken as the total values of the glycerin and nicotine contents in the samples. Each sample was tested 5 times, and the average value of the test results was taken as the total value of the nicotine or glycerin content in the tested samples, A _Tm .

(2) The temperature is adjusted to 280°C, and the cigarette core segment samples are tested using the above method. The average value of the test results is taken as the nicotine or glycerin content release value A _Td in the tested samples.

(3) Calculate the release efficiency of glycerin and nicotine of the cigarette core segment samples of Experimental Example 1, Experimental Example 2 and the comparative example using the following formula: The test results are shown in Table 4.

According to Table 4, the cigarette core segment samples (Experimental Examples 1-2) made of the support member of the present invention have higher glycerin release efficiency and nicotine release efficiency under the same heating conditions (280°C, circumferential heating), while the samples made without the support member (Comparative Example) have glycerin and nicotine release efficiencies of less than 70%. Among them, the sample made of the support member of Example 2-2 with a higher glycerin content has a glycerin release efficiency of more than 75%, and a nicotine release efficiency of up to more than 80%. It can be seen that the influence of the support member that first contacts the heat source on the release efficiency of the aerosol generation substrate is critical. When the outer layer of the cigarette core is designed as a support member with a high glycerin content, the aerosol generation substrate release efficiency of the entire cigarette core can be significantly improved.

The mechanism of aerosol formation is that after the aerosol-generating matrix is heated, volatile components such as glycerin and nicotine are released to form steam, which is then cooled during the puffing process. According to the nucleation mechanism, the steam condenses to form droplets. When the temperature is low enough, the number of droplets is large enough, and they condense with each other to form large-size aerosol droplets. Since glycerin is a precursor to the aerosol formation process, that is, the vapor-state glycerin molecules are first condensed into liquid near their saturated vapor temperature (290°C at normal pressure), and then the remaining substances such as nicotine are adsorbed on the droplets to become part of the aerosol. Therefore, the content of glycerin molecules directly determines the number of droplets in the aerosol. When the number of aerosol droplets is large enough, the absorption behavior of the remaining substances in the mixed vapor is also more significant, thereby reducing the vapor concentration of the corresponding components and promoting the release of the corresponding components in the aerosol-generating matrix. Therefore, when the aerosol-generating matrix close to the heat source is designed to load a considerable amount of glycerin, the problem of small amount of heated smoke and insufficient satisfaction can be solved from the source.

There are usually two ways to heat the aerosol-generating matrix, namely circumferential heating and bottom and circumferential combined heating. For the bottom and circumferential combined heating method, the temperature in the bottom direction is the highest temperature area, and the temperature in the circumferential direction is the secondary high temperature area. In this case, when the circumferential direction is set to an aerosol-generating matrix with a high glycerol load (such as the load member of the present invention), it will be beneficial for the glycerol to be released at the first time, quickly increase the proportion of glycerol molecules in the steam, and significantly promote the release of substances such as nicotine and glycerol in the cigarette core, thereby increasing the amount of smoke and satisfaction when the user smokes. For the circumferential heating method, the temperature in the circumferential direction is the highest temperature area, and then the temperature field expands into the interior of the aerosol-generating matrix. In this case, for the wrapping paper, the internal cellulose, hemicellulose, lignin and other substances (referred to as non-smoking substances in the present invention) undergo pyrolysis reactions under a heated state of about 300°C, which will cause the released aerosol to be mixed with impurities and miscellaneous gases, greatly reducing the user's satisfaction.

The present invention also performs thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) on the load members of Example 2-1 and Example 2-2, and the results show that the peak temperature of non-smoking substance release of the load member of Example 2-1 (glycerol content of 21.5%) is around 304.4°C, and the peak temperature of non-smoking substance release of the load member of Example 2-2 (glycerol content of 47.2%) is around 323.6°C. It can be seen that increasing the glycerol content of the load member can significantly increase the temperature at which the load member releases non-smoking substances, and the release temperature of Example 2-2 is about 20°C higher than that of Example 2-1. Therefore, when the circumferential direction is set to an aerosol generating matrix with a high aerosol generating agent content (such as the carrier of the present invention), the carrier absorbs a portion of the heat from the circumferential direction and plays a role of "heat consumption". During the heating process, the aerosol generating agent such as glycerin is released from the carrier. The thermal release temperature of glycerin is much lower than the thermal decomposition temperature of the packaging paper components, thereby avoiding the thermal decomposition of non-smoking substances in the packaging paper, effectively "protecting" the packaging paper, and significantly reducing the amount of impurities and mixed gases in the generated aerosol.

It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims (10)

An aerosol generating product comprises a composite cigarette core segment, characterized in that the composite cigarette core segment comprises an aerosol generating matrix and a load member rolled together, the load member comprises a substrate, the substrate carries a load substance, and the heat release temperature of the load substance is lower than the pyrolysis temperature of the substrate. The aerosol generating product according to claim 1 is characterized in that the substrate is in a sheet shape, the substrate is rolled into a tube shape, and the aerosol generating matrix is filled in the area surrounded by the tubular substrate. The aerosol generating product according to claim 1 is characterized in that the substrate is in a sheet shape, the substrate is integrally wound into a spiral tube shape, and the aerosol generating matrix is filled in the area surrounded by the tubular substrate. The aerosol generating product according to claim 1 is characterized in that the substrate is in a sheet shape, a plurality of the substrates are sequentially connected to form a tube, and the aerosol generating matrix is filled in the area surrounded by the tubular substrate. The aerosol generating product according to claim 1 is characterized in that the substrate is in sheet shape, the aerosol generating matrix is in sheet shape, the surface of the aerosol generating matrix and/or the supporting member has texture, the supporting member and the aerosol generating matrix are wound together, and the texture forms a ventilation space. The aerosol generating product according to claim 1 is characterized in that the substrate is in a sheet shape, and the aerosol generating matrix and the substrate are randomly mixed in a tubular shape. The aerosol generating article according to claim 1, characterized in that the load substance comprises glycerol and/or propylene glycol. The aerosol generating product according to claim 1 is characterized in that the composite cigarette core segment further comprises wrapping paper, which is wrapped around the outside of the aerosol generating substrate and the carrier member rolled together. A method for preparing a carrier member of an aerosol generating article according to any one of claims 1 to 8, characterized in that the preparation method comprises the following steps: S1. Weigh raw materials: weigh 25-46 parts of plant fiber, 2-6 parts of adhesive, 20-50 parts of aerosol generator, 10-40 parts of thermal conductive filler and 0.23-0.47 parts of preparation aid, wherein the preparation aid includes 0.15-0.25 parts of dry strength agent, 0.05-0.15 parts of wet strength agent and 0.03-0.07 parts of retention aid; The plant fiber includes at least one of wood pulp fiber, straw pulp fiber and hemp pulp fiber, the binder includes at least one of cellulose derivatives, sodium alginate, starch, pectin, guar gum, gum, chitosan, dextran, carrageenan and calcium carbonate, and the aerosol generator includes glycerol and/or propylene glycol; The thermal conductive filler includes at least one of a metal filler, a ceramic filler and a carbon material; the metal filler includes at least one of Al, Cu, Ag and Au; the ceramic filler includes at least one of Al ₂ O ₃ , MgO, BN and Si ₃ N ₄ ; the carbon material includes at least one of graphite, graphene, reduced graphene oxide, carbon nanotubes, carbon fiber and diamond; The dry strength agent is anionic amphoteric polyacrylamide, the wet strength agent is polyamide epichlorohydrin resin, and the retention agent is cationic polyacrylamide; S2. preparing an initial slurry: pretreating the plant fiber, then adding water to pulp and periodically measuring the pulping degree to obtain an initial slurry; S3, preparing a mixed slurry: adding the thermal conductive filler to the slurry, mixing and defiberizing, then adding the dry strength agent and stirring for the first time, adding the aerosol generator, the binder and the wet strength agent and stirring for the second time, then adding the retention agent and stirring for the third time to obtain a mixed slurry; S4, preparing a load member: the mixed slurry is sheeted, pressed and dried to obtain a substrate, the substrate is loaded with a load substance, and the load member is obtained after drying, wherein the content of the aerosol generating agent in the load member is 20-50wt%. The method for preparing a carrier of an aerosol generating article according to claim 9, characterized in that in the step S2, the plant fiber is soaked in 3-7L of water for 3-7h, and then 15-20L of water is added for pulping until the pulp has a beating degree of 30-38°SR; In the step S3, the rotation speed of the fiber decomposition is 8000-15000r; the first stirring is stirring at 500-1500rpm for 3-7min, the second stirring is stirring at 300-1000rpm for 3-7min, and the third stirring is stirring at 300-1000rpm for 3-7min; In the step S4, the mixed slurry is sheeted and pressed at a pressure of 300-500 kPa for 2-4 minutes, and then dried at 30-50° C. for 4-6 hours to obtain a substrate; the substrate is loaded with a loading substance solution containing 1-3 wt % of a thickener, and dried at room temperature for 1.5-2.5 hours, and finally dried at 30-50° C. for 10-14 hours to obtain a loading part; The load material includes glycerol and/or propylene glycol; the adhesive and the thickener both include nanocellulose, and the nanocellulose has a diameter of 30-40 nm and a weight average length of 1.8-2.5 mm.