Capsule used as aerosol generating substrate and aerosol generating product

Abstract

The invention provides a capsule used as an aerosol generating substrate, the capsule contains fuming materials propylene glycol and glycerol, a capsule skin comprises a colloidal substance, the colloidal substance is at least one of animal glue, vegetable glue, starch and a starch modifier, and only one layer of capsule skin is provided. The invention also discloses an aerosol generating product using the capsule, and uniform and sufficient smoke release can be obtained at a lower heating temperature, so that the aerosol product can further reduce the energy consumption, reduce the release of harmful substances and improve the feeling of a smoker.

Description

A capsule used as an aerosol generation matrix and an aerosol generation product Technical Field

[0001] This invention belongs to the field of aerosol generation technology, specifically relating to a capsule used as an aerosol generation matrix and an aerosol generation product. Background Technology

[0002] Aerosol-generating products refer to products that release aerosols. Common aerosol-generating products are tobacco products, which generate aerosols through combustion or heating for consumers to inhale. Heated aerosol-generating products utilize an external heat source to heat the aerosol-generating substrate. Currently, commonly used substrates are tobacco sheets, which can be heated to 300-500℃. Compared to the combustion temperature of traditional cigarettes, which is typically above 800℃, this significantly reduces the release of tar and harmful substances in mainstream smoke. However, due to the lower actual heating temperature, less smoke is released, reducing the smoking experience. Increasing the amount of smoke produced requires increasing the amounts of glycerin and propylene glycol. However, glycerin itself has good hygroscopic properties, resulting in high hygroscopicity of the product, causing significant inconvenience in later processing and storage. Furthermore, once the packaging is opened, the cigarettes cannot be protected, leading to uneven smoking of different cigarettes. Additionally, heat transfer takes time, resulting in inconsistent smoke production even within the same cigarette.

[0003] In existing technologies, some literature mentions using PG (propylene glycol) / VG (glycerol)-coated capsules as aerosol generation matrix. However, many documents only propose the concept without disclosing how to prepare PG / VG-coated capsules. Some documents also disclose the preparation technology of PG / VG-coated capsules and use them as aerosol generation matrix, but all have certain drawbacks. For example, some literature mentions using polylactic acid (PLA) to form a gel shell through stirring and coagulation. Capsules prepared by this method have a wide particle size distribution and inconsistent shapes, generally making it difficult to produce perfectly round spherical capsules. Furthermore, the capsule wall thickness distribution is uneven, leading to significant deviations in application, especially poor uniformity during heated release. Other technologies use light-cured gel shells. These methods use plastics, resins, rubber, and other components for the capsule shells, and the light curing process requires photoinitiators and photosensitizers. Gem shells made from these materials tend to retain a strong plastic or peculiar taste, especially when the capsule is used as an aerosol generation matrix. Under heating conditions, the gel shell can easily release unpleasant odors or even harmful substances, negatively impacting the inhalation experience. In addition, if capsules are prepared using the three-layer dripping technique, i.e., water-based capsules prepared by oil-in-water method with an outermost layer of rubber, this technique will result in an excessively thick rubber layer and a low proportion of water-soluble materials. When heated, the release efficiency will be low. Furthermore, during long-term storage, the core liquid is also prone to breaking through the middle layer and contacting the outer water-soluble rubber layer, which will also cause the internal liquid to slowly seep out. Summary of the Invention

[0004] To overcome the above problems, the present invention provides a capsule of an aerosol generating matrix and an aerosol generating product, the specific solutions of which are as follows:

[0005] A capsule used as an aerosol generating matrix, the capsule comprising a core material and a rubber shell encapsulating the core material, the core material comprising an aqueous liquid formulation containing a fuming substance that can be released by heating, the fuming substance comprising propylene glycol and glycerol, the rubber shell comprising a colloidal substance, the colloidal substance being at least one selected from animal glue, plant glue, starch, and starch modifiers, the capsule comprising only one layer of rubber shell.

[0006] Optionally, the aqueous liquid formulation accounts for 5 to 60 wt% of the core material.

[0007] Optionally, the aqueous liquid formulation accounts for 15 to 50 wt% of the core material.

[0008] Optionally, the propylene glycol and glycerol account for 80 to 100 wt% of the total weight of the aqueous liquid formulation.

[0009] Optionally, the core material may further include 0.1 to 20 wt% nicotine and / or nicotine salts by weight of the core material.

[0010] Optionally, the core material may further include 0.1 to 20 wt% of fragrance and / or extracts by weight of the core material.

[0011] Optionally, the weight ratio of propylene glycol to glycerol is 2:8 to 8:2.

[0012] Optionally, the particle size of the capsule is 0.5 to 8 mm.

[0013] Optionally, the capsule has a particle size of 1 to 3 mm.

[0014] Optionally, the thickness of the rubber sheet is 50–150 μm.

[0015] Optionally, the rubber sheet may further include a curing agent, which is a polyol.

[0016] Optionally, the rubber sheet may also include a metal salt reinforcing agent.

[0017] An aerosol-generating article includes an aerosol-generating matrix, wherein the aerosol-generating matrix includes the capsules described above.

[0018] Optionally, the heating release temperature of the aerosol-generated product is greater than 150°C.

[0019] Optionally, the heating release temperature of the aerosol-generated product is 200-300℃.

[0020] Optionally, the heating release temperature of the aerosol-generated product is 210-240℃.

[0021] The present invention provides a capsule and an aerosol generating product used as an aerosol generating matrix. The capsule contains propylene glycol and glycerol as smoke-generating materials, and the capsule shell includes a colloidal substance, which is at least one of animal glue, plant glue, starch, and starch-modified substances. The capsule shell is a single layer. The aerosol generating product using the capsule can achieve uniform and sufficient smoke release at a lower heating temperature. Therefore, the aerosol product can further reduce energy consumption and the release of harmful substances while improving the smoker's experience. Detailed Implementation

[0022] A specific embodiment of the present invention provides a capsule used as an aerosol generating matrix. The capsule includes a core material and a rubber shell encapsulating the core material. The core material includes an aqueous liquid formulation containing a fuming substance that can be released by heating. The fuming substance includes propylene glycol and glycerol. The rubber shell includes a colloidal substance, which is at least one of animal glue, plant glue, starch, and starch modifiers. The capsule includes only one layer of rubber shell.

[0023] The capsule described in this specific embodiment of the invention, through the combination of propylene glycol and glycerol, achieves a lower aerosol release temperature while maintaining sufficient smoke release. It then serves as an aerosol generating material in the form of a capsule encapsulation. The capsule shell comprises a colloidal substance, which is at least one of animal glue, plant gum, starch, and starch-modified substances. The shell is a single layer. Aerosol generating products including this capsule can achieve uniform and sufficient smoke release at lower heating temperatures, thereby reducing energy consumption, minimizing the release of harmful substances, and improving the smoker's experience.

[0024] In some specific embodiments of the capsule described in this invention, the aqueous liquid formulation is water or a liquid formulation that can be uniformly dispersed in water molecules to form a solution, such as ethanol, glycerol, or propylene glycol, etc.

[0025] In some specific embodiments of the capsule of the present invention, the aqueous liquid formulation accounts for 5-60 wt% of the weight of the core material; in some specific embodiments, the aqueous liquid formulation accounts for 15-50 wt% of the weight of the core material; in some specific embodiments, the aqueous liquid formulation accounts for 25-45 wt% of the weight of the core material, and specifically, for example, it can be 25 wt%, 30 wt%, 35 wt%, 40 wt%, or 45 wt%, etc.

[0026] In some embodiments of the capsule of the present invention, the propylene glycol and glycerol account for more than 80 wt% of the total weight of the aqueous liquid formulation; in some embodiments, the propylene glycol and glycerol account for more than 85 wt% of the total weight of the aqueous liquid formulation; in some embodiments, the propylene glycol and glycerol account for more than 90 wt% of the total weight of the aqueous liquid formulation; in some embodiments, the propylene glycol and glycerol account for more than 95 wt% of the total weight of the aqueous liquid formulation; and in some embodiments, the propylene glycol and glycerol account for 100 wt% of the total weight of the aqueous liquid formulation.

[0027] In some embodiments of the capsule described in this invention, the core material further includes 0.1–20 wt% of flavoring and / or extracts, and in other embodiments, 3–10 wt% of flavoring and / or extracts. The flavoring includes oil-soluble or water-soluble flavorings, such as fruit-flavored flavorings like lemon, mango, or sweet orange. The extracts generally refer to plant or animal extracts, such as musk or ambergris, preferably plant extracts like tea extract or monk fruit extract, and more preferably tobacco extracts, such as tobacco water extract, tobacco alcohol extract, or tobacco distillation products.

[0028] In some specific embodiments of the capsule of the present invention, the core material further includes 0.1 to 20 wt% nicotine and / or nicotine salts, specifically, the content of nicotine and / or nicotine salts is 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 7 wt%, 9 wt%, 10 wt%, 12 wt%, 14 wt%, or 16 wt% of the core material, etc.

[0029] In the capsules of this invention, considering that a higher propylene glycol content in the core material results in a higher nicotine carryover, and a higher glycerol content increases the average aerosol particle size, leading to a better visual effect, the design aims to ensure both the amount of smoke and the amount of nicotine carryover, as well as the visual effect of the aerosol. Since cigarette consumers need both the pleasure of nicotine and the visual appeal of smoke, in some specific embodiments, the weight ratio of propylene glycol to glycerol is 2:8 to 8:2, specifically, for example, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, or 8:2, etc.

[0030] In the specific embodiments of the present invention, considering that the release temperature of the photocurable rubber layer is relatively high, making its preparation difficult, and that it is difficult to uniformly mix propylene glycol and glycerol to form a mixture as the capsule core, and that wax-coated capsules have insufficient encapsulation stability, with the encapsulated propylene glycol and glycerol easily penetrating the wax rubber layer and volatilizing, and are prone to breakage, making production, processing and use difficult, the rubber layer in some specific embodiments includes colloidal substances and curing agents.

[0031] In some specific embodiments of the capsule of the present invention, the colloidal substance is at least one of animal glue, plant glue, starch and starch modifiers. The animal glue may be, for example, gelatin, fish glue or chitosan, etc., and the plant glue may be, for example, carrageenan, sodium alginate, gellan gum or tamarind gum, etc.

[0032] In some specific embodiments of the capsule described in this invention, the curing agent is a polyol, such as glycerol or sorbitol.

[0033] In some embodiments of the capsule described in this invention, the capsule shell further includes a reinforcing agent. In some embodiments, the reinforcing agent is a metal salt, such as calcium chloride, potassium chloride, calcium carbonate, calcium phosphate, or calcium dihydrogen phosphate.

[0034] In some specific embodiments of the capsule of the present invention, the capsule shell further includes a sweetener, such as mogroside, sucralose, or xylitol.

[0035] In some specific embodiments of the capsule described in this invention, the core material further includes an oily preparation and a structural agent; the structural agent includes cellulose and / or cellulose derivatives, low molecular weight lipids, and surfactants; the core material is a paste, a colloid, or a solid-liquid mixture. The combination of the cellulose and / or cellulose derivatives and the low molecular weight lipids facilitates the formation of a network structure in the oily preparation that promotes the dispersion and fixation of propylene glycol and glycerol. The surfactants contribute to the formation of an oil film between the core material and the rubber layer, thereby facilitating the encapsulation of the core material by the rubber layer. The core material formed from the propylene glycol and glycerol, the oily preparation, and the structural agent is in the form of a paste, a colloid, or a solid-liquid mixture at room temperature (25°C), which is beneficial for achieving stable encapsulation of the core material by the rubber layer.

[0036] It should be clarified that using oily agents and structural agents in the core material is only one means of coating propylene glycol and glycerol. To coat propylene glycol and glycerol, other known encapsulation methods can be used, such as coating-spheronization, freeze-coating, and coagulation methods. The following only describes the preferred method used in this invention, namely, the method of preparing propylene glycol and glycerol-coated capsules by dripping.

[0037] In some specific embodiments of the present invention, the yield rate of the capsules is above 50%; in some specific embodiments, the yield rate of the capsules is above 60%; in some specific embodiments, the yield rate of the capsules is above 70%; in some specific embodiments, the yield rate of the capsules is above 80%; in some specific embodiments, the yield rate of the capsules is above 90%; in some specific embodiments, the yield rate of the capsules is above 95%; and in some specific embodiments, the yield rate of the capsules is 100%.

[0038] In some specific embodiments of the capsule described in this invention, the surfactant has an HLB value of 2 to 10, and more specifically, an HLB value of 4 to 7. This HLB value range is conducive to forming a core material in the form of a paste, colloid, or solid-liquid mixture, which can facilitate more stable encapsulation.

[0039] In some specific embodiments of the capsule of the present invention, the oily preparation accounts for 20-80 wt% of the weight of the core material, and in other specific embodiments, the oily preparation accounts for 30-60 wt% of the weight of the core material. For example, it can be 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, or 60 wt%, etc.

[0040] In some embodiments of the capsule of the present invention, the structural agent accounts for 5 to 20 wt% of the weight of the core material, and in other embodiments, the structural agent accounts for 10 to 15 wt% of the weight of the core material. For example, it can be 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, or 15 wt%, etc.

[0041] In some specific embodiments of the capsule of the present invention, the cellulose and / or cellulose derivatives and low molecular weight lipids together account for 70-95 wt% of the weight of the structural agent, and the surfactant accounts for 30-5 wt% of the weight of the structural agent. In other specific embodiments, the cellulose and / or cellulose derivatives and low molecular weight lipids together account for 75 wt%, 80 wt%, 85 wt%, or 90 wt% of the weight of the structural agent, etc.

[0042] In some specific embodiments of the capsule described in this invention, the weight ratio of cellulose and / or cellulose derivatives to low molecular weight lipids is 20:1 to 1:1, specifically, it can be 20:1, 18:1, 16:1, 14:1, 12:1, 10:1, 9:1, 8:1, 7:1, 6:1, 5:1, 4:1, 3:1, 2:1 or 1:1, etc.

[0043] In some specific embodiments of the capsules described in this invention, the viscosity of the cellulose and / or cellulose derivative is 1–300 mPa·s, accounting for 1–10 wt% of the core material weight. This viscosity is defined as the viscosity in a solution containing 5 wt% cellulose and / or cellulose derivatives, using a mixed solution of 80 wt% toluene and 20 wt% ethanol (EtOH) as a solvent. If the proportion of cellulose and / or cellulose derivatives to the core material weight is too high, the core material will be too hard, making encapsulation difficult. If the proportion is too low, it is not conducive to the formation of a paste, colloid, or solid-liquid mixture. A viscosity greater than 300 mPa·s is not conducive to product drop forming. In some specific embodiments, the cellulose and / or cellulose derivative is at least one of cellulose acetate, nitrocellulose, and ethyl cellulose.

[0044] The capsules described in this invention use low molecular weight lipids. The term "low molecular weight" is a conventional understanding in the art. In some embodiments, the low molecular weight lipids may be lipids with a number average molecular weight below 3000. In some embodiments, the low molecular weight lipids are at least one of animal waxes, plant waxes, mineral waxes, synthetic waxes, lecithin and its derivatives, phytosterols and their esters, fatty acids and their esters, triglycerides, and fatty alcohols. Specific examples of animal waxes include beeswax, insect wax, beeswax, or cetacean wax. Specific examples of plant waxes include palm wax, candelilla wax, rice wax, or sunflower wax. Specific examples of mineral waxes include paraffin wax, ceresin wax, or microcrystalline wax. Specific examples of synthetic waxes include mixtures of natural waxes and chemically synthesized resins, such as plastic wax. Specific examples of phytosterols and their esters, and fatty acids and their esters, include β-sitosterol or γ-sitosterol.

[0045] In some specific embodiments of the capsule described in this invention, the surfactant is at least one selected from anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants. Specific examples of the anionic surfactant include sodium lauryl sulfate, triethanolamine lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, sodium stearate, semi-cured sodium borate, semi-cured potassium borate, potassium stearate oleate, potassium castor oil, sodium alkylnaphthalene sulfonate, sodium dialkyl sulfosuccinate, sodium alkyl diphenyl ether disulfonate, diethanolamine alkyl phosphate, potassium alkyl phosphate, sodium polyoxyethylene alkyl sulfate, or sodium polyoxyethylene alkylphenyl ether sulfate, etc. Specific examples of the cationic surfactant include lauryltrimethylammonium chloride, stearyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, distearate dimethylammonium chloride, alkylphenyl dimethylammonium chloride, stearyl oleate, stearyl acetate, or stearic acid, etc. The nonionic surfactant may specifically be, for example, glycerol fatty acid esters, propylene glycol fatty acid esters, sorbitol fatty acid esters, polyoxyethylene sorbitol fatty acid esters, propylene fatty acid esters, glycerol fatty acid esters, monosaccharide fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene sorbitol tetraoleate, polyoxyethylene alkyl ethers, polyoxypropylene alkyl ethers, polyoxyethylene polyoxypropylene glycol, polyoxyethylene polyoxypropylene alkyl ethers, and organic esters of polyethylene glycol, such as polyethylene glycol fatty acid esters, polyoxyethylene glycol oil, and polyoxyethylene hydrogenated castor oil. In some specific embodiments, the nonionic surfactant is selected from sorbitol fatty acid esters, polyoxyethylene sorbitol fatty acid esters, or polyoxyethylene sorbitol fatty acid esters. The amphoteric surfactant may specifically be, for example, alkyl dimethylaminoacetic acid betaine, alkyl dimethylamine oxide, alkyl carboxymethyl hydroxyethyl imidazolium betaine, lecithin, lauryl aminopropionic acid, or alkyl diaminoethyl glycine, etc.

[0046] In some specific embodiments of the capsule of the present invention, the surfactant is a combination of at least one of glyceryl monooleate and Span with Tween, having the HLB value. For example, combinations of Tween 80 and glyceryl monooleate, combinations of Tween 20 and glyceryl monooleate, combinations of Tween 80 and Span 80, combinations of Tween 20 and Span 80, etc.

[0047] In some specific embodiments of the capsule of the present invention, the oily preparation is at least one of animal oil, vegetable oil and mineral oil. The animal oil may be, for example, tallow or lard. The vegetable oil may be, for example, soybean oil, olive oil, corn oil, safflower oil, wheat germ oil or sunflower seed oil. The mineral oil may be, for example, silicone oil or white oil.

[0048] In some embodiments of the present invention, considering the aerosol release effect, the particle size of the capsule is 0.5-8 mm, and in other embodiments, the particle size of the capsule product is 1-3 mm, specifically, for example, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, etc.

[0049] In some specific embodiments of the present invention, considering the influence of the thickness of the capsule shell on the strength of the aerosol-generated capsule and the amount of aerosol release, the thickness of the capsule shell is 50-150 μm, specifically, for example, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm or 150 μm, etc.

[0050] A specific embodiment of the present invention also provides a method for preparing the capsule as described above, comprising the following steps:

[0051] The capsule is prepared by forming a rubber coating around a core material comprising propylene glycol and glycerol, the rubber coating comprising a colloidal substance, the colloidal substance being at least one of animal glue, plant glue, starch, and starch modifiers;

[0052] In some specific embodiments of the capsule preparation method of the present invention, the steps further include:

[0053] A core material is prepared by mixing an aqueous liquid formulation containing propylene glycol and glycerol with an oily formulation and a structural agent.

[0054] A film-forming liquid is prepared from raw materials containing colloidal substances, curing agents, and water.

[0055] The capsule is prepared by coating the core material with the coating liquid.

[0056] In some specific embodiments of the present invention, the preparation method of the capsule involves heating the oily preparation to 90°C to 150°C, adding the cellulose and / or cellulose derivatives and low molecular weight lipids while stirring, dissolving and mixing evenly, cooling to 50°C to 80°C, adding the propylene glycol and glycerol and a surfactant, stirring evenly, and preparing the core material.

[0057] In some specific embodiments of the present invention, the preparation method of the capsule involves adding the colloidal substance into purified water, stirring and heating at a temperature of 60-90°C to form a uniform solution, adding a curing agent, or a curing agent, reinforcing agent, sweetener, etc., and stirring evenly to prepare the film liquid.

[0058] The capsule preparation method of this invention, wherein the capsule is prepared by coating the core material with the coating solution, can employ existing encapsulation methods. In some specific embodiments, the method is a concentric tube dripping method, in which the core material and coating solution are dripped and dried through a concentric dropper to prepare the aerosol-generated capsule. The core material is introduced through an inner tube, and the coating solution is introduced through an outer tube. Different film thicknesses can be formed by adjusting the amount of coating solution added.

[0059] A further embodiment of the present invention provides an aerosol generating article, comprising an aerosol generating matrix, wherein the aerosol generating matrix comprises the capsules described above.

[0060] The aerosol generating product of this invention has a low heating release temperature. In some specific embodiments, the heating release temperature of the aerosol generating product is greater than 150°C. In other specific embodiments, the heating release temperature is 200-300°C. The specific heating release temperature can be, for example, 200°C, 210°C, 220°C, 230°C, 240°C, 250°C, 260°C, 270°C, 280°C, or 290°C, etc.

[0061] The present invention will be further illustrated by specific embodiments below.

[0062] Test instructions:

[0063] Core material state at room temperature: Add the core material to a 100ml test tube and leave it at room temperature for 4 hours, then observe the state of the core material.

[0064] Stability: Add the core material to a 100ml test tube and leave it at room temperature. If it does not separate into layers after more than 10 hours, it is considered good; if it separates into layers after 6 to 10 hours, it is considered relatively good; if it separates into layers after less than 6 hours, it is considered poor.

[0065] Particle size: The diameter of 30 capsules was measured using a vernier caliper, and the average diameter was taken.

[0066] Yield: Observe the positional relationship between the core material and the rubber sheet using a magnifying glass. Ideally, the core material should be in the exact center of the rubber sheet, with the rubber sheet completely covering the core material and maintaining a minimum thickness of 50μm. If the core material deviates from the exact center of the rubber sheet, resulting in a thickness of less than 10μm at some point around the core material, or if the core material punctures the rubber sheet, preventing the rubber sheet from completely covering the core material, then the capsule is considered defective. Observe the rubber sheet coverage of 100 capsules using a magnifying glass and calculate the yield. A yield of over 90% indicates a high yield, while a yield of less than 50% indicates a low yield.

[0067] Wall thickness: The thickness is calculated by dividing the center of the capsule product into two parts and measuring four points to obtain the average value of the left, right, top, and bottom.

[0068] Volatilization calculation:

[0069]

[0070] Ma: Weight of the capsule product; Mb: Weight of the capsule product after heating.

[0071] Nicotine content: The capsules were filled into paper tubes, placed in a low-temperature smoking device, and smoked using a smoking machine with a 15-second interval between puffs and 2 seconds per puff, for a total of 15 puffs. The filter was then collected, and the nicotine content was measured.

[0072] Example

[0073] Example 1

[0074] 40 parts by weight of sunflower seed oil were heated to 100°C. While stirring, cellulose and / or cellulose derivatives and low molecular weight lipids (total structural agent 13 parts by weight, Table 1 shows the weight ratio of cellulose and / or cellulose derivatives, low molecular weight lipids and surfactants) were added and dissolved until homogeneous. The mixture was then cooled to 60°C. 24 parts by weight of propylene glycol, 16 parts by weight of glycerol, surfactants from Table 1, 5 parts by weight of mango flavoring, and 2 parts by weight of nicotine salt were added and stirred until homogeneous to complete the core material preparation. The core material was observed at room temperature and its stability was assessed. The results are shown in Table 1 below.

[0075] Table 1. Capsules prepared with different structuring agent formulations and test results.

[0076]

[0077]

[0078] Continued from Table 1

[0079]

[0080] As shown in Table 1 above, the core material formed by combining cellulose and / or cellulose derivatives with low molecular weight lipids, and a surfactant with an HLB value between 2 and 10, especially between 4 and 7, with a high content of aqueous propylene glycol / glycerol in oily sunflower oil, is a colloid at room temperature and has good stability, resulting in a high yield of capsules.

[0081] Based on formulations 11 and 12 in Table 1, it can be seen that the yield rate is low when the structural agent does not contain cellulose and / or cellulose derivatives or low molecular weight lipids; in addition, in the comparative experiment, the yield rate is also low if the structural agent does not contain surfactants.

[0082] Example 2

[0083] Heat 40 parts by weight of sunflower seed oil to 100°C, add the raw materials according to the ratio of formula 7 in Table 1, dissolve and mix evenly, cool to 60°C, add 40 parts by weight of propylene glycol and glycerol (PG / VG) as shown in Table 2, 5 parts by weight of mango flavoring, and 2 parts by weight of nicotine salt, stir evenly to complete the preparation of the core material.

[0084] Add 5 parts by weight of carrageenan and 3 parts by weight of gellan gum to 82 parts by weight of purified water, and heat while stirring at a temperature of 60-90°C to form a homogeneous solution. Add 10 parts by weight of glycerol and stir until homogeneous to prepare the film solution.

[0085] Using a concentric dropper, the core material (inner layer) and film liquid are dripped into the cooling liquid (MCT) while the temperature is controlled at 10℃~25℃ to form wet capsules. The capsules are then stored at -10℃~10℃ for 10 hours and dried at 20~30℃ and 20%~50% humidity to obtain capsule products with a particle size of 2mm and a wall thickness of 70μm.

[0086] The capsules were filled into paper tubes and placed in a low-temperature smoke heater for heating and inhalation. The inhalation interval was 15 seconds, with each puff lasting 2 seconds, for a total of 15 puffs. Different heating temperatures were achieved by adjusting the heater settings. The volatilization amounts of different propylene glycol (PG) / glycerol (VG) ratios at different temperatures are shown in Table 2 below.

[0087] Table 2 Comparison of the volatilization amounts of different propylene glycol (PG) / glycerol (VG) ratios at different temperatures.

[0088]

[0089] As shown in Table 2 above, the volatilization of aerosols increases with increasing heating temperature. The volatilization rate is similar between 220℃ and 300℃, indicating that at lower inhalation temperatures (220-260℃), the volatilization rate is essentially the same. The volatilization rate decreases with increasing glycerol content; however, at inhalation temperatures of 220-260℃, when the glycerol content is below 60 wt%, the volatilization rate can remain above 30%. Further analysis was conducted on the nicotine content of smoke generated from aerosol products (all including 0.22g capsules) made from capsules with different propylene glycol (PG) / glycerol (VG) ratios at 240℃ after inhalation. The results are shown in Table 3 below.

[0090] Table 3. Nicotine content in smoke at 240℃ for different propylene glycol (PG) / glycerol (VG) ratios.

[0091] PG / VG ratio 100 / 0.80 / 20 60 / 40 40 / 60 20 / 800 / 100 Nicotine content (mg) 3.8 2.94 2.28 1.76 1.37 1.05 surface

[0092] As shown in Table 3 above, the higher the propylene glycol content, the higher the nicotine carryover. A propylene glycol content above 40 wt% maintains a relatively high nicotine carryover rate. Furthermore, according to known technologies, the higher the glycerol content, the better the visual effect of the aerosol. Considering the aerogel's evaporation rate, nicotine carryover, and visual effect, a propylene glycol to glycerol ratio between 2:8 and 8:2, especially between 4:6 and 6:4, yields the best results.

[0093] Example 3

[0094] Except for particle size, other conditions were the same as in Example 2. Capsule products with particle sizes of 1 mm, 2 mm, 3 mm, 4 mm and 5 mm were prepared. The volatilization of different propylene glycol (PG) / glycerol (VG) at a heating temperature of 240°C was tested, and the results are listed in Table 4 below.

[0095] Table 4 Comparison of volatile matter content of propylene glycol (PG) / glycerol (VG) with different particle sizes

[0096]

[0097] As shown in Table 4 above, when the particle size of the capsule products is between 1 and 3 mm and the ratio of propylene glycol to glycerol is different, the amount of volatilization is similar. As the particle size increases, the amount of aerosol generated decreases. If the particle size is too small, the content of propylene glycol and glycerol encapsulated is low, and the amount of aerosol generated is also low.

[0098] Example 4

[0099] Except for particle size and wall thickness, other conditions were the same as in Example 2. Capsules with a particle size of 2.5 mm and different wall thicknesses and different propylene glycol (PG) / glycerol (VG) were prepared. The volatilization amount and capsule strength were tested at a heating temperature of 240°C and the results are listed in Table 5 below.

[0100] Table 5 Comparison of volatile matter and capsule strength for different wall thicknesses and propylene glycol (PG) / glycerol (VG) ratios

[0101]

[0102] As shown in Table 5 above, although capsules with a wall thickness of less than 50 μm have good smoke production, they are fragile and prone to breakage during the filling process into paper tubes, making them difficult to preserve. Capsules with a wall thickness of more than 150 μm are less prone to breakage during heating and produce less smoke.

[0103] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A capsule used as an aerosol generation matrix, characterized in that, The capsule comprises a core material and a rubber shell encapsulating the core material. The core material comprises an aqueous liquid formulation containing a fuming substance that can be released upon heating. The fuming substance includes propylene glycol and glycerol. The rubber shell comprises a colloidal substance, which is at least one of animal glue, plant glue, starch, and starch-modified products. The capsule comprises only one layer of rubber shell.

2. The capsule according to claim 1, wherein the aqueous liquid formulation accounts for 5-60 wt% of the core material.

3. The capsule according to claim 2, wherein the aqueous liquid formulation accounts for 15-50 wt% of the core material.

4. The capsule according to claim 1, wherein the propylene glycol and glycerol account for 80-100 wt% of the total weight of the aqueous liquid formulation.

5. The capsule according to claim 1, wherein the core material further comprises 0.1 to 20 wt% nicotine and / or nicotine salts by weight of the core material.

6. The capsule according to claim 1, wherein the core material further comprises 0.1 to 20 wt% of flavoring and / or extracts by weight of the core material.

7. The capsule according to claim 1, wherein the weight ratio of propylene glycol to glycerol is 2:8 to 8:

2.

8. The capsule according to claim 1, characterized in that, The capsules have a particle size of 0.5–8 mm.

9. The capsule according to claim 8, characterized in that, The capsules have a particle size of 1–3 mm.

10. The capsule according to claim 1, characterized in that, The thickness of the rubber sheet is 50–150 μm.

11. The capsule according to claim 1, characterized in that, The rubber sheet also includes a curing agent, which is a polyol.

12. The capsule according to claim 1, characterized in that, The rubber also includes a metal salt reinforcing agent.

13. An aerosol-generating article comprising an aerosol-generating matrix, wherein the aerosol-generating matrix comprises the capsule as described in any one of claims 1 to 12.

14. The aerosol-generating article according to claim 13, characterized in that, The heating release temperature of the aerosol-generated product is greater than 150°C.

15. The aerosol-generating article according to claim 14, characterized in that, The heating release temperature of the aerosol-generated product is 200-300℃.

16. The aerosol-generating article according to claim 15, characterized in that, The heating release temperature of the aerosol-generated product is 210-240℃.

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