Seamless capsule for cigarette, preparation method and aerosol generating product

Abstract

The invention discloses a seamless capsule for a cigarette, a preparation method and an aerosol generating product. The seamless capsule for the cigarette comprises core liquid, a rubber shell wrapping the core liquid and a coating layer wrapping the periphery of the rubber shell. The coating layer comprises the following components in parts by weight: 5-10 parts of a film-forming agent, 0.1-0.5 part of a scrubbing agent and 0.01-0.05 part of an anti-sticking agent; the film-forming agent contains 50-100% of plant alcohol-soluble protein on the basis that the mass of the film-forming agent is 100%. According to the seamless capsule for the cigarettes, the moisture resistance and temperature resistance of the seamless capsule for the cigarettes are enhanced by using the coating layer formed by the plant alcohol-soluble protein. The frosted agent and the anti-sticking agent are added into the coating layer, so that the surface of the coating layer has certain roughness, and the seamless capsule for the cigarette can be conveniently implanted into a filter stick of an aerosol generating product.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco processing, and in particular relates to a seamless capsule for cigarettes, a preparation method and an aerosol generating product. Background Art

[0002] Seamless capsules for cigarettes refer to round beads that can be squeezed and added to the filter rods of aerosol-generating products. The round beads are made of a gel shell as the wall material, and a core material with aromatic substances is wrapped inside. Currently, most core materials are oily components, and very few core materials are water-soluble components. After the seamless capsules for cigarettes are squeezed, they can release some aromatic substances themselves. Finally, during the smoking process, the temperature of the smoke is used to increase the volatilization of the aromatic substances, and they enter the user's mouth during the smoking process, increasing the user's sensory experience.

[0003] The main function of seamless capsules for cigarettes is to seal the aroma substances. Smokers squeeze the capsules during smoking to make the liquid inside flow out and release the aroma. However, since the capsules usually use hydrophilic wall materials to wrap the oily solution, the capsules are easily affected by the humidity of the environment and become soft, and further softened in the high temperature and high humidity smoke environment. This not only affects the feel and fun, but also causes the capsules to be irregular in shape during the production process, making it difficult to accurately implant the filter rod, and may adhere to the inner wall of the delivery pipeline, causing blockage and affecting production efficiency. Summary of the invention

[0004] Aiming at the problem that the existing seamless capsules for cigarettes are easy to absorb moisture and become soft, the present invention provides a seamless capsule for cigarettes, a preparation method and an aerosol generating product.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows: In a first aspect, an embodiment of the present invention provides a seamless capsule for cigarettes, comprising a core liquid, a capsule shell wrapping the core liquid, and a coating layer coated on the periphery of the capsule shell; the coating layer comprises 5 to 10 parts of a film-forming agent, 0.1 to 0.5 parts of abrasive agents, and 0.01 to 0.05 parts of an anti-sticking agent; based on the mass of the film-forming agent being 100%, the film-forming agent contains 50 to 100% of plant alcohol-soluble protein.

[0006] Optionally, the scrub agent is selected from at least one of microcrystalline cellulose, polyvinylidene chloride, polyvinylidene fluoride, polyperfluoroethylene propylene, polyvinyl chloride, and insoluble metal salts; And / or, the film-forming agent further includes at least one of hydroxypropyl methylcellulose, polyacrylate, and polyvinyl alcohol.

[0007] Optionally, the particle size of the abrasive is 2000-3000 mesh.

[0008] Optionally, the thickness y1 of the coating layer is 50-300 μm.

[0009] Optionally, the ratio y1 / y2 of the thickness y1 of the coating layer to the thickness y2 of the gel shell is (0.5 to 5):1.

[0010] Optionally, the core liquid includes an oil-soluble liquid, and the gel shell includes the following weight components: 2 to 10 parts of a gelling agent, 0.1 to 5 parts of a plasticizer, 0.1 to 5 parts of a curing agent, and 0 to 0.5 parts of a filler.

[0011] In a second aspect, the present invention also provides a method for preparing a seamless capsule for smoking articles, comprising the following steps: Obtain a core liquid, a gel shell liquid for preparing the gel shell, and a coating liquid for preparing the coating layer; Drop the gel shell liquid and the core liquid into a cooling liquid through a coaxial double-layer dropper to obtain wet pills with the gel shell wrapping the core liquid; Dry and shape the wet pills to obtain capsules, and perform segmented coating on the surface of the capsules. The segmented coating uses a segmented spraying process to evenly spray the coating liquid and dry it to obtain the seamless capsules for smoking articles.

[0012] Optionally, the method for preparing the coating liquid comprises the following steps: Mix the film-forming agent, the abrasive agent, and the anti-sticking agent, and then add them to ethanol with a mass content of 90 to 100% to obtain a coating liquid with a mass concentration of 5 to 15%.

[0013] Optionally, the environmental temperature of the capsules during the segmented coating is 30 to 35°C, and the segmented coating includes a first stage, a second stage, and a third stage: In the first stage, the coating liquid is delivered at a speed of 8 to 12 r / min for 5 to 10 min to form a first film on the surface of the capsules; In the second stage, the coating liquid is delivered at a speed of 11 to 15 r / min for 5 to 15 min to form a second film on the surface of the first film of the capsules; In the third stage, the coating liquid is delivered at a speed of 13 to 22 r / min for 20 to 60 min to form a third film on the surface of the second film of the capsules. The first film, the second film, and the third film together form the coating layer.

[0014] In a third aspect, the present invention also provides an aerosol generating article, comprising a smoking section, a cooling section, a filtering section, and the seamless capsule for smoking articles as described above, wherein the seamless capsule for smoking articles is disposed in at least one of the smoking section, the cooling section, or the filtering section.

[0015] In the present invention, by using a coating layer formed of plant alcohol-soluble protein, the moisture resistance and temperature resistance of the seamless capsule for cigarettes are enhanced. By adding an abrasive and an anti-adhesive agent to the coating layer, the surface of the coating layer has a certain roughness, which facilitates the implantation of the seamless capsule for cigarettes into the filter rod of the aerosol generating article. In particular, by means of segmented coating, a coating layer is formed on the surface of the capsule, which helps the coating layer to adhere to the surface of the capsule and ensures the integrity and uniformity of the coating layer. Detailed implementation manners

[0016] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clear, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] An embodiment of the present invention discloses a seamless capsule for cigarettes, which includes a core liquid, a rubber shell wrapping the core liquid, and a coating layer coated on the outer periphery of the rubber shell; the coating layer includes 5 to 10 parts of a film-forming agent, 0.1 to 0.5 parts of an abrasive, and 0.01 to 0.05 parts of an anti-adhesive agent; based on the mass of the film-forming agent being 100%, the film-forming agent contains 50% to 100% of plant alcohol-soluble protein.

[0018] In this embodiment, by using a coating layer formed of plant alcohol-soluble protein, the moisture resistance and temperature resistance of the seamless capsule for cigarettes are enhanced. By adding an abrasive and an anti-adhesive agent to the coating layer, the surface of the coating layer has a certain roughness, which facilitates subsequent implantation in the aerosol generating article. And it solves the problems of capsule adhesion and aggregation during the coating process caused by too high content of plant alcohol-soluble protein in the coating layer.

[0019] Specifically, the content of plant alcohol-soluble protein in the film-forming agent includes but is not limited to 60% - 90%, 70% - 80%. More specifically, the content of plant alcohol-soluble protein in the film-forming agent includes but is not limited to 50%, 54%, 58%, 62%, 66%, 70%, 74%, 78%, 82%, 86%, 90%, 94%, 98% or 100%. When the content of plant alcohol-soluble protein decreases, the high-temperature and high-humidity resistance of the coating layer decreases. However, the tobacco seamless capsule is light in weight. During the coating process, a high content of plant alcohol-soluble protein will cause protein molecules to form cross-links during the drying process, increasing the adhesiveness on the outer surface of the capsule shell, resulting in the capsules sticking together in clusters when they come into contact with each other, thus affecting the appearance and quality of the capsules and increasing the difficulty of equipment cleaning. In this embodiment, by adding an abrasive and an anti-adhesive agent to the coating layer, the adhesion and agglomeration problems of the tobacco seamless capsule during the coating process are effectively solved. At the same time, the addition of the abrasive increases the surface roughness of the coating layer, facilitating the implantation of the tobacco capsule in the aerosol-generating article. The abrasive, through its granular structure and hardness characteristics, produces a microscopic physical friction effect on the surface of the tobacco seamless capsule, thereby removing the smooth layer or thin-layer substances on the surface, increasing the surface roughness, and making the surface roughness value within the range of 1.5 - 5 μm, which further helps to improve the adhesion of the capsule, reduce the gloss or meet specific surface treatment requirements.

[0020] The anti-adhesive agent is a chemical substance or additive specifically used to prevent adhesion or sticking between materials. By forming a low-surface-energy thin film or physical isolation layer on the contact surface, it reduces the frictional force and mutual attraction between materials, thus effectively avoiding the occurrence of bonding phenomena.

[0021] The weight parts of the film-forming agent in the coating layer include but are not limited to 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts. The weight parts of the abrasive include but are not limited to 0.1 part, 0.2 part, 0.3 part, 0.4 part or 0.5 part. The weight parts of the anti-adhesive agent include but are not limited to 0.01 part, 0.02 part, 0.03 part, 0.04 part or 0.05 part.

[0022] Further, the plant alcohol-soluble protein is selected from zein.

[0023] In some embodiments, the abrasive is selected from at least one of microcrystalline cellulose, polyvinylidene chloride, polyvinylidene fluoride, perfluoroethylene-propylene copolymer, polyvinyl chloride, and insoluble metal salts. By selecting the above-mentioned abrasive, on the one hand, it increases the surface roughness of the coating layer, facilitating subsequent implantation in the aerosol-generating article. On the other hand, it improves the moisture and temperature resistance of the coating layer.

[0024] Specifically, the insoluble metal salt includes at least one of calcium carbonate and magnesium carbonate.

[0025] In some embodiments, the anti-sticking agent is selected from silica.

[0026] In some embodiments, the particle size of the abrasive is 2000 - 3000 mesh. By selecting the abrasive with the above particle size, the problems of adhesion and agglomeration of seamless tobacco capsules during the coating process are further solved, and at the same time, the surface roughness of the coating layer is improved.

[0027] In some embodiments, the film-forming agent further includes at least one of hydroxypropyl methylcellulose, polyacrylate, and polyvinyl alcohol. By adding other film-forming agents, the strength of the coating layer and its moisture resistance and temperature resistance are adjusted.

[0028] In some embodiments, the particle diameter x of the seamless tobacco capsule is 1 - 4.5 mm, and the thickness y1 of the coating layer is 50 - 300 μm. By limiting the thickness of the coating layer within the above range, the moisture resistance and temperature resistance of the seamless tobacco capsule are enhanced. In particular, by limiting the particle diameter of the seamless tobacco capsule and the thickness of the coating layer, the pressure value of the seamless tobacco capsule can also be regulated to prevent problems such as weak and fragile capsule strength or high strength and difficult-to-crush.

[0029] In some embodiments, the ratio y1 / y2 of the thickness y1 of the coating layer to the thickness y2 of the capsule shell is (0.5 - 5):1. By regulating the ratio of the thickness of the coating layer to the thickness of the capsule shell, the pressure value of the capsule is regulated to prevent the capsule from being damaged during transportation or implantation into an aerosol generating article due to too small a pressure value.

[0030] In a preferred embodiment, y1 is 80 - 200 μm, and y1 / y2 = (0.56 - 1.7):1.

[0031] In a preferred embodiment, y1 is 120 - 150 μm, and y1 / y2 = (0.7 - 1):1.

[0032] In one embodiment, the mass ratio of the weight m1 of the coating layer to the mass m2 of the seamless tobacco capsule is (0.01 - 0.1):1. By regulating the mass ratio of the coating layer to the seamless tobacco capsule, the coating effect of the capsule can be controlled more effectively, making the coating layer thickness uniform and complete, and achieving the required moisture resistance and temperature resistance of the capsule.

[0033] In a preferred embodiment, the mass ratio of the weight m1 of the coating layer to the mass m2 of the seamless tobacco capsule is (0.02 - 0.7):1.

[0034] In a preferred embodiment, the mass ratio of the weight m1 of the coating layer to the mass m2 of the seamless tobacco capsule is (0.03 - 0.5):1.

[0035] In some embodiments, the core liquid includes an oil-soluble liquid, and the rubber shell includes the following weight components: 2 to 10 parts of a gelling agent, 0.1 to 5 parts of a plasticizer, 0.1 to 5 parts of a curing agent, and 0 to 0.5 parts of a filler.

[0036] The oil-soluble liquid includes at least one of an oil-soluble essence, tobacco leaf essential oil, tobacco leaf absolute, vegetable oil, and hydrogenated vegetable oil. By using the oil-soluble essence, tobacco leaf essential oil, and tobacco leaf absolute in combination with a water-soluble essence, the aroma level of the smoke is improved.

[0037] By adding a plasticizer, not only the strength of the rubber shell is enhanced, but also its elasticity is improved, effectively avoiding the problem of rupture of the rubber shell during storage. In addition, the introduction of the curing agent promotes the gelation of the rubber shell, forming a strong capsule wall and further enhancing the structural stability of the capsule.

[0038] In some embodiments, the gelling agent includes at least one of gellan gum, alginate, carrageenan, gum arabic, pectin, and agar.

[0039] The plasticizer includes at least one of sorbitol, propylene glycol, mannitol, and glycerol.

[0040] The curing agent is a soluble monovalent or divalent metal cation salt. Specifically, the curing agent includes at least one of magnesium chloride, potassium chloride, and calcium chloride.

[0041] The filler includes at least one of a pigment and particulate matter. The particulate matter includes at least one of silica, calcium carbonate, magnesium carbonate, and pyridinium dichromate. By adding the particulate matter, the forming rate of the capsule is further improved. The pigment includes synthetic pigments, natural pigments, etc.

[0042] In this embodiment, by selecting the above-mentioned gelling agent, plasticizer, and curing agent, the rubber shell is not easily broken and has flexibility to protect the internal core liquid.

[0043] Specifically, the seamless tobacco capsule in the above embodiment can withstand immersion in pure water at 25 °C for 90 min, and the pressure value change of the seamless tobacco capsule is ≤ ±15%; withstand immersion in pure water at 37 °C for 60 min, and the pressure value change of the seamless tobacco capsule is ≤ ±15%; withstand immersion in pure water at 60 °C for 12 min, and the pressure value change of the seamless tobacco capsule is ≤ ±15%.

[0044] And after the seamless tobacco capsule is soaked, it can still make a "crack" crisp sound when pinched and broken.

[0045] In a second aspect, the present invention also provides a method for preparing a seamless tobacco capsule, including the following steps: Obtain core liquid, the shell liquid for preparing the shell, and the coating liquid for preparing the coating layer; Drop the shell liquid and the core liquid into the cooling liquid through a coaxial double-layer dropper to obtain wet pills with the shell wrapping the core liquid; Dry and shape the wet pills to obtain capsules, and perform segmented coating on the surface of the capsules. The segmented coating uses a segmented spraying process to evenly spray the coating liquid and dry it to produce seamless tobacco capsules. Forming a coating layer on the surface of the capsules through segmented coating helps the coating layer adhere to the surface of the capsules and ensures the integrity and uniformity of the coating layer.

[0046] In some embodiments, the preparation method of the coating liquid includes the following steps: Mix the film-forming agent, the abrasive agent, and the anti-sticking agent, and then add them to ethanol with a mass content of 90 - 100% to obtain a coating liquid with a mass concentration of 5% - 15%. By selecting ethanol with a mass content of 90 - 100% as the solvent, it is convenient for the volatilization of ethanol during the subsequent drying process of the capsules, and at the same time, it prevents the shell from absorbing water and becoming soft during the coating process. When the mass concentration of the coating liquid is lower than 5%, the coating time is too long and the amount of ethanol volatilization is large. When the mass concentration of the coating liquid is higher than this range, it is easy to cause the adhesion of the capsules during the coating process, which is not conducive to coating.

[0047] In some embodiments, the environmental temperature of the capsules during the segmented coating process is 30 - 35 °C, and the segmented coating includes a first stage, a second stage, and a third stage: In the first stage, the coating liquid is transported at a speed of 8 - 12 r / min for 5 - 10 min to form a first film on the surface of the capsules; In the second stage, the coating liquid is transported at a speed of 11 - 15 r / min for 5 - 15 min to form a second film on the surface of the first film of the capsules; In the third stage, the coating liquid is transported at a speed of 13 - 22 r / min for 20 - 60 min to form a third film on the surface of the second film of the capsules. The first film, the second film, and the third film together form the coating layer.

[0048] By adjusting the amount of the sprayed coating liquid, segmented coating is carried out to further control the thickness of the coating layer.

[0049] An embodiment of the present invention further provides an aerosol - generating article, the structure of which includes a smoking section, a cooling section, a filtering section, and the seamless cigarette capsule described above. The seamless cigarette capsule is disposed in at least one of the smoking section, the cooling section, or the filtering section. Specifically, the cooling section and the filtering section adopt tow - shaped filter rods, which are made of cellulose acetate tow or polypropylene through processes such as spinning, bundling, stretching, and crimping. At least one seamless cigarette capsule is disposed in the filter rod. When a user inhales the aerosol - generating article, by squeezing and breaking the fragile cigarette capsule, the flavoring substance in the capsule can be volatilized and released when the smoke passes through, thereby enhancing the aroma effect. At the same time, since this section is relatively close to the heat source, when the smoke passes through, it can not only promote the volatilization of the flavoring substance, but also effectively remove harmful components in the smoke by means of the filtering function of the filter rod, improving the use experience and safety of the aerosol - generating article.

[0050] The present invention will be further described below through examples.

[0051] Example 1 This example is used to illustrate the seamless cigarette capsule and its preparation method disclosed by the present invention.

[0052] Preparation of the capsule: 2.5 parts of gellan gum, 0.2 part of sodium alginate, 1.2 parts of agar, 0.1 part of glycerol, and 0.5 part of magnesium chloride are added to deionized water and heated to dissolve, and then dropped into a coolant through a coaxial double - layer dropper together with an oil - soluble liquid to obtain wet pills, which are dried to obtain the capsule.

[0053] Film coating of the capsule: The above - obtained capsule is subjected to film coating by a segmented coating process. The coating solution includes 5 parts of zein, 0.2 part of calcium carbonate (abrasive, 2000 mesh), 0.01 part of silicon dioxide (anti - sticking agent), and 60 parts of absolute ethanol, and the mass concentration of the coating solution is 8%. After drying treatment, a seamless cigarette capsule is obtained.

[0054] The particle size x of the seamless cigarette capsule is 3 mm, and the weight m2 is 13.5 mg. The weight m1 of the coating layer is 0.15 mg, the thickness y1 of the coating layer is 53 μm, and the thickness y2 of the capsule shell is 66 μm.

[0055] Example 2 This example is used to illustrate the seamless cigarette capsule and its preparation method disclosed by the present invention. The difference from Example 1 is as follows: The coating solution includes 9 parts of zein, 1 part of hydroxypropyl methylcellulose, 0.2 part of magnesium carbonate (abrasive, 2000 mesh), 0.03 part of silicon dioxide (anti - sticking agent), and 117 parts of absolute ethanol, and the mass concentration of the coating solution is 8%.

[0056] The particle size x of the seamless cigarette capsules is 3 mm, and the weight m2 is 13.5 mg. The weight m1 of the coating layer is 0.5 mg, the thickness y1 of the coating layer is 134 μm, and the thickness y2 of the capsule shell is 66 μm.

[0057] Example 3 This example is used to illustrate the seamless cigarette capsules and their preparation method disclosed by the present invention. The difference from Example 1 is as follows: The coating solution includes 7 parts of zein, 1 part of polyacrylate, 0.1 part of magnesium carbonate, 0.1 part of calcium carbonate (abrasive, 2000 mesh), 0.05 part of silicon dioxide (anti-sticking agent), and 95 parts of absolute ethanol. The mass concentration of the coating solution is 8%.

[0058] The particle size x of the seamless cigarette capsules is 3 mm, and the weight m2 is 13.5 mg. The weight m1 of the coating layer is 1.4 mg, the thickness y1 of the coating layer is 221 μm, and the thickness y2 of the capsule shell is 66 μm.

[0059] Examples 4 - 12 Examples 4 - 12 are used to illustrate the seamless cigarette capsules and their preparation method disclosed by the present invention. The difference from Example 3 is as follows: The seamless cigarette capsules are produced with reference to the data in Table 1. The thickness and weight of the coating layer and the weight of the seamless cigarette capsules are adjusted by controlling the spraying time of the coating solution.

[0060] Among them, for the thickness of the capsule shell and the coating layer: The metallographic microscope method is adopted. By adjusting the height of the sample stage, the distance between the surface of the object to be measured and the objective lens is changed to complete focusing, and the thickness of the film layer is calculated by measuring the height difference between the outer interface and the inner interface of the film layer. The thickness is measured for 50 capsules, and the average value is taken.

[0061] For the weight of a single seamless cigarette capsule and the weight of the coating layer: The weight is detected by a ten-thousandth electronic balance. The capsule is placed in the electronic balance to detect its weight, and then the core liquid is extruded by rolling and the weight of its wall material is measured. The weight of the coating layer = the weight of the capsule after coating - the weight of the capsule before coating. There are 10 capsules in each group, and the average value is taken after measuring 10 groups.

[0062] Table 1 Examples 13 - 22 Examples 13 - 22 are used to illustrate the seamless cigarette capsules and their preparation method disclosed by the present invention. The difference from Example 3 is as follows: The formula in Table 2 is referred to.

[0063] Table 2 Comparative Examples 1 - 3 Comparative Examples 1 to 3 are used to illustrate the seamless capsule for cigarettes and its preparation method disclosed in the present invention. The differences from Example 3 are as follows: The seamless capsule for cigarettes is produced with reference to the data in Table 1.

[0064] Comparative Examples 4 to 10 Comparative Examples 4 to 10 are used to illustrate the seamless capsule for cigarettes and its preparation method disclosed in the present invention. The differences from Example 3 are as follows: The seamless capsule for cigarettes is produced with reference to the formulation in Table 2.

[0065] Comparative Example 11 This comparative example is used to illustrate the seamless capsule for cigarettes and its preparation method disclosed in the present invention. The difference from Example 3 is that the capsule is not coated.

[0066] Performance Test The seamless capsules for cigarettes prepared in the above examples and comparative examples are detected.

[0067] 1. Detection of pressure value: Specifically, according to the product standard of the cigarette capsule strength detector Q / 63310207-4.1-J6.1-2016 in the industry, the seamless capsule for cigarettes is uniformly pressed by two parallel planes until it is broken. During this process, the maximum pressure value received by the capsule is the pressure value of this capsule. 100 capsules are measured for the pressure value, and the average value is taken.

[0068] 2. "Crack" sound: When the capsule is placed on the fingertip and pinched to break, the capsule will make a crisp "crack" sound.

[0069] The above-obtained capsules are subjected to pure water immersion experiments at 25°C / 90 min, 37°C / 60 min, and 60°C / 12 min, and the changes in the capsule pressure value and the presence or absence of a "crack" crisp sound when pinched are compared. The specific test results are shown in Table 3.

[0070] Table 3 From the test results of Examples 1 to 12 and Comparative Examples 1 to 3, 11, it can be seen that the coating layer thickness has a decisive influence on the water resistance and temperature resistance performance of the capsule. If the coating layer thickness is too thin, the moisture resistance and temperature resistance performance cannot be satisfied.

[0071] From the test results of Example 3, 13 and Comparative Example 4, it can be seen that the moisture resistance and temperature resistance performance of the capsule mainly comes from the film-forming agent plant alcohol-soluble protein. Too low a proportion of plant alcohol-soluble protein cannot meet the moisture resistance and temperature resistance performance required for the seamless capsule for cigarettes.

[0072] It can be seen from the test results of Examples 1-3, 19, 20 and Comparative Examples 5-8 that if the proportions of the abrasive and the anti-adhesive agent in the coating layer are too high, it will have a great impact on the compactness of the coating layer, resulting in the inability to meet the moisture resistance and temperature resistance requirements of seamless capsules for cigarettes. When there is no abrasive or anti-adhesive agent in the coating layer, capsule adhesion is likely to occur, and even the coating layer will crack and dissolve during the moisture resistance and temperature resistance tests, and the surface roughness of the capsule does not meet the product performance requirements.

[0073] It can be seen from the test results of Examples 3, 16-18 that when the particle size of the abrasive is not within the range of 2000-3000 mesh, although it has little impact on the temperature resistance and moisture resistance of the capsule, if the particle size of the abrasive is too small, it will cause the surface of the capsule to turn white, and the particles adhere not firmly, which does not meet the product quality requirements. If the particle size of the abrasive is too large, the surface roughness of the capsule does not meet the product performance requirements.

[0074] It can be seen from the test results of Examples 3, 21, 22 and Comparative Examples 9, 10 that when the mass concentration of the coating solution is not within the range of 5%-15%, if the concentration is too low, although coating can be carried out, the coating effect is poor and the compactness is weak. If the concentration is too high, it will cause capsule adhesion and coating cannot be carried out.

[0075] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A seamless capsule for cigarettes, characterized in that: The invention comprises a core liquid, a capsule shell wrapping the core liquid, and a coating layer coated on the periphery of the capsule shell; the coating layer comprises the following components by weight: 5 to 10 parts of a film-forming agent, 0.1 to 0.5 parts of abrasive agents, and 0.01 to 0.05 parts of an anti-sticking agent; based on 100% by weight of the film-forming agent, the film-forming agent contains 50 to 100% of plant alcohol-soluble protein.

2. The seamless capsule for cigarettes according to claim 1, characterized in that: The scrub agent is selected from at least one of microcrystalline cellulose, polyvinylidene chloride, polyvinylidene fluoride, polyperfluoroethylene propylene, polyvinyl chloride, and insoluble metal salts; And / or, the film-forming agent further includes at least one of hydroxypropyl methylcellulose, polyacrylate, and polyvinyl alcohol.

3. The seamless capsule for cigarettes according to claim 1, characterized in that: The particle size of the abrasive is 2000-3000 meshes.

4. The seamless capsule for cigarettes according to claim 1, characterized in that: The thickness y1 of the coating layer is 50-300 μm.

5. The seamless capsule for cigarettes according to claim 1, characterized in that: The ratio of the thickness y1 of the coating layer to the thickness y2 of the capsule shell is y1 / y2=(0.5~5):

1.

6. The seamless capsule for cigarettes according to claim 5, characterized in that: The core liquid includes an oil-soluble liquid, and the plastic shell includes the following components by weight: 2 to 10 parts of a gelling agent, 0.1 to 5 parts of a plasticizer, 0.1 to 5 parts of a curing agent, and 0 to 0.5 parts of a filler.

7. A method for preparing a seamless capsule for tobacco according to any one of claims 1 to 6, characterized in that: The following steps are involved: Obtaining a core liquid, a capsule liquid for preparing the capsule shell, and a coating liquid for preparing the coating layer; The shell liquid and the core liquid are dripped into the cooling liquid through a coaxial double-layer dripper to obtain a wet pellet with the core liquid wrapped in the shell; The wet pellets are dried and formed into capsules, and the surface of the capsules is coated in sections, and the coating liquid is evenly sprayed in the section-by-section coating process and dried to obtain seamless capsules for cigarettes.

8. The method for preparing seamless capsules for cigarettes according to claim 7, characterized in that: The preparation method of the coating solution comprises the following steps: The film-forming agent, the abrasive agent and the anti-sticking agent are mixed and added into ethanol with a mass content of 90-100% to obtain a coating solution with a mass concentration of 5%-15%.

9. The method for preparing seamless capsules for cigarettes according to claim 7, characterized in that: The ambient temperature of the capsule during the segmented coating process is 30-35° C., and the segmented coating includes a first stage, a second stage and a third stage: In the first stage, the coating liquid is conveyed at a speed of 8-12 r / min for 5-10 min, and a first film is formed on the surface of the capsule; In the second stage, the coating liquid is conveyed at a speed of 11-15 r / min for 5-15 min to form a second film on the surface of the first film of the capsule; In the third stage, the coating liquid is transported at a speed of 13-22 r / min for 20-60 min to form a third film on the surface of the second film of the capsule. The first film, the second film and the third film together form the coating layer.

10. An aerosol generating product, comprising a smoke-generating section, a cooling section, a filtering section and a seamless cigarette capsule as described in any one of claims 1 to 6 or a seamless cigarette capsule prepared by the preparation method as described in any one of claims 7 to 9, wherein the seamless cigarette capsule is arranged in at least one of the smoke-generating section, the cooling section or the filtering section.

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