Multifunctional sheet for aerosol-generating article, manufacturing method therefor, and aerosol-generating article comprising same

Abstract

Disclosed is a multifunctional sheet for an aerosol-generating article. According to one aspect, provided is a multifunctional sheet for an aerosol-generating article, the sheet having a concave-convex portion on at least one surface thereof and comprising any one selected from the group consisting of a nicotine sheet, a paper filter, and a reconstituted tobacco sheet, wherein the ratio of the maximum depth of the concave-convex portion to the maximum thickness of the multifunctional sheet for an aerosol-generating article is greater than 0% and less than or equal to 10%.

Description

Multifunctional sheet for aerosol generating articles, method of manufacturing the same, and aerosol generating article including the same

[0001] The present invention (Disclosure) relates to a multifunctional sheet for an aerosol generating article, and more specifically, to a multifunctional sheet for an aerosol generating article, a method for manufacturing the same, and an aerosol generating article comprising the same.

[0002] Aerosol generators generally disperse liquid or solid particles into a gas to provide them in a form that can be inhaled along with the gas. Such devices can primarily be used in electronic cigarettes, inhaled drug delivery systems, and the like. However, conventional aerosol generators have faced problems where the amount of aerosol transferred is limited due to airflow resistance, resulting in reduced aerosol generation efficiency.

[0003] [Prior Art Literature]

[0004] [Patent Literature]

[0005] (Patent Document 1) Korean Published Patent Application No. 10-2023-0147319 (Published Oct. 23, 2023)

[0006] According to one aspect, the invention provides a multifunctional sheet for an aerosol generating product that can increase the amount of aerosol transferred by improving the airflow of the aerosol.

[0007] According to another aspect, a multifunctional sheet for aerosol generating products is provided that can lower suction resistance by increasing swelling when manufactured in a rod form.

[0008] According to another aspect, a multifunctional sheet for aerosol generating articles is provided that can maintain the mechanical properties of a sheet having a thin thickness or low basis weight.

[0009] According to another aspect, a method for manufacturing a multifunctional sheet for the aerosol generating article is provided.

[0010] According to another aspect, an aerosol generating article is provided that includes a multifunctional sheet for the aerosol generating article.

[0011] The objects of the present invention are not limited to those mentioned above, and other unmentioned objects and advantages of the present invention may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof described in the specification.

[0012] According to a first aspect of the present invention, a multifunctional sheet for an aerosol generating article is provided, comprising a concave-convex portion on at least one surface, wherein the multifunctional sheet for an aerosol generating article comprises any one selected from the group consisting of a nicotine sheet, a paper filter, and a plate-shaped leaf sheet, and satisfies Formula 1 below.

[0013] [Equation 1]

[0014] 0% < T = [(H1 / H2) X 100] ≤ 10%

[0015] In the above Equation 1, H2 is the maximum thickness of the multifunctional sheet for the aerosol generating article, H1 is the maximum depth of the uneven portion, and T is the ratio (percentage) of the maximum depth of the uneven portion to the maximum thickness of the multifunctional sheet for the aerosol generating article.

[0016] According to the second aspect of the present invention, in the first aspect, T in Equation 1 may be greater than 0% and less than or equal to 1%.

[0017] According to a third aspect of the present invention, in the first or second aspect, T in Formula 1 may be greater than 0% and less than or equal to 0.25%.

[0018] According to the fourth aspect of the present invention, in any one of the first to third aspects, the maximum thickness of the nicotine sheet may be 80㎛ or more and 240㎛ or less.

[0019] According to the fifth aspect of the present invention, in any one of the first to third aspects, the maximum thickness of the paper filter may be 20 μm or more and 80 μm or less.

[0020] According to the sixth aspect of the present invention, in any one of the first to third and fifth aspects, the basis weight of the paper filter is 15 g / m² 2 40 g / m² or more 2 It may be less than.

[0021] According to the seventh aspect of the present invention, in any one of the first to third aspects, the maximum thickness of the plate-shaped leaf sheet may be 80 μm or more and 150 μm or less.

[0022] According to the eighth aspect of the present invention, a method for manufacturing a multifunctional sheet for an aerosol generating article is provided, comprising: (S1) preparing a preliminary multifunctional sheet selected from the group consisting of a nicotine sheet, a paper filter, and a plate-shaped leaf sheet; and (S2) manufacturing a multifunctional sheet for an aerosol generating article by corona discharge treatment of at least one surface of the preliminary multifunctional sheet.

[0023] According to the ninth aspect of the present invention, in the eighth aspect, the step (S2) may include a step of processing with a voltage of 20 kV or more and 40 kV or less and a frequency of 20 kHz or more and 40 kHz or less.

[0024] According to the 10th aspect of the present invention, an aerosol generating article is provided, comprising: a filter portion including at least one; and a medium portion disposed on one side of the filter portion, wherein at least one of the filter portion and the medium portion comprises a multifunctional sheet for an aerosol generating article according to any one of the 1st to 7th aspects, and wherein the paper filter is configured to be included in the filter portion, and the nicotine sheet or the plate-shaped leaf sheet is configured to be included in the medium portion.

[0025] The means for solving the above problem are not all of the features of the present invention and may be combined with some embodiments of this specification. Various features of the present invention and the advantages and effects derived therefrom may be understood in more detail by referring to the specific description below.

[0026] According to one aspect, when a multifunctional sheet for an aerosol generating article is molded into a rod shape, the effect of enhanced swelling can be achieved by forming fine gaps and voids between the sheets. Accordingly, the density of the sheet per unit volume within the rod is lowered, thereby improving the flow of the aerosol.

[0027] In addition to the effects described above, specific effects of the present invention are described together with the following explanation of specific details for implementing the invention. Furthermore, the effects of the present invention are not limited to those mentioned above and can be easily realized by means and combinations thereof described in the specification.

[0028] FIG. 1 shows a multifunctional sheet for an aerosol generating article according to one embodiment of the present invention.

[0029] Figure 2 is a cross-sectional view of part A of Figure 1.

[0030] FIG. 3 shows an aerosol generating article according to one embodiment of the present invention.

[0031] FIG. 4 shows an aerosol generating article according to another embodiment of the present invention.

[0032] In this specification, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0033] In this specification, the terms “comprise” and / or “comprising” specify the presence of the mentioned features, steps, numbers, actions, parts, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other features, steps, numbers, actions, parts, elements, and / or groups thereof.

[0034] In this specification, expressions such as “first,” “second,” “(S1),” “(S2),” etc. may modify various components regardless of order and / or importance and do not limit such components. These expressions may be used to distinguish one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be renamed the first component.

[0035] In this specification, "at least one of a, b and c" is defined as comprising one or more selected from the group consisting of a, b and c.

[0036] Where various embodiments are described in this specification, each embodiment may be combined unless specifically stated otherwise. In this case, the effects of the present invention may be defined as including effects derived from each embodiment and effects resulting from the organic combination of each embodiment. For example, even if embodiments 1 and 2 are described independently in this specification, unless the context clearly indicates otherwise, embodiments 1 and 2 may be organically combined with each other, and the effects of the present invention may include effects resulting from the combination of embodiments 1 and 2.

[0037] In this specification, a range of numerical values ​​indicated by the term 'to' represents a range of numerical values ​​that includes the values ​​listed before and after the term as the lower and upper limits, respectively. For example, if 'a to b' is described in the specification, it may be understood that 'a to b' (a to b) is described.

[0038] In the present specification, if multiple numerical values ​​are disclosed for the upper and lower limits of any numerical range, the numerical range disclosed in the present specification may be understood as a range of any numerical values ​​in which any one of the multiple lower limit values ​​and any one of the multiple upper limit values ​​are respectively the lower limit value and the upper limit value. For example, if a or greater, or b or greater; and c or less, or d or less is described, it may be understood as a or greater and c or less, a or greater and d or less, b or greater and c or less, or b or greater and d or less.

[0039] In conventional aerosol generating products, if the sheet included in the product does not form wrinkles, the amount of aerosol transferred is limited due to airflow resistance, and there is a problem of reduced aerosol generation efficiency. This low amount of aerosol transferred can lower the intensity of the smoking sensation, which can cause a decrease in the user's smoking satisfaction.

[0040] According to one aspect of the present invention, a multifunctional sheet for an aerosol generating article is provided, comprising an uneven surface on at least one surface, wherein the multifunctional sheet for an aerosol generating article comprises any one selected from the group consisting of a nicotine sheet, a paper filter, and a plate-shaped leaf sheet, and satisfies Formula 1 below.

[0041] [Equation 1]

[0042] 0% < T = [(H1 / H2) X 100] ≤ 10%

[0043] In the above Equation 1, H2 is the maximum thickness of the multifunctional sheet for the aerosol generating article, H1 is the maximum depth of the uneven portion, and T is the ratio (percentage) of the maximum depth of the uneven portion to the maximum thickness of the multifunctional sheet for the aerosol generating article.

[0044] According to one aspect of the present invention, the multifunctional sheet for an aerosol generating article satisfies Equation 1, thereby improving the flow of aerosol airflow to increase the amount of aerosol transferred, and consequently, achieving an effect of excellent taste intensity. Specifically, the multifunctional sheet for an aerosol generating article may have structural features that allow for greater transfer of aerosol per unit volume within the rod by forming an uneven surface. When such a multifunctional sheet for an aerosol generating article is molded into a rod shape, swelling properties can be enhanced by forming fine gaps and voids between the sheets. Accordingly, the density of the sheet per unit volume within the rod is lowered, thereby improving the flow of aerosol airflow. If the multifunctional sheet for an aerosol generating article does not satisfy Equation 1, problems may arise such as the sheet tearing easily when molded into a rod shape or the aerosol airflow not being sufficiently improved.

[0045] 1. Multifunctional sheet for aerosol-generating products

[0046] FIG. 1 shows a multifunctional sheet for an aerosol generating article according to one embodiment of the present invention.

[0047] Figure 2 is a cross-sectional view of part A of Figure 1.

[0048] Referring to FIGS. 1 and 2, the multifunctional sheet (5) for an aerosol generating article according to the present invention includes an uneven surface (1) on at least one surface.

[0049] In this specification, the term “aerosol generating article” may mean any smokeable product or any product capable of providing a smoking experience, regardless of whether it is based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. For example, an aerosol generating article may include smokeable products such as cigarettes, cigars, and cigarillos. As another example, an aerosol generating article may include a combustible article or a heating article.

[0050] In this specification, the "multifunctional sheet for an aerosol generating article" can function as a filter element or an aerosol forming substrate (e.g., a medium) in an aerosol generating article.

[0051] In this specification, "sheet" may be defined to mean a subsheet whose width, length, and thickness can be defined, or a laminate in which two or more of the subsheets are stacked. For example, the shape of the sheet may be a single sheet having a crimped shape with fine irregularities formed therein, or a shape in which two or more cut subsheets are stacked. For example, if two or more cut subsheets are stacked, each of the subsheets may also have a crimped shape.

[0052] In this specification, "maximum thickness (H2) of the multifunctional sheet (5) for an aerosol generating article" may mean the maximum thickness of the multifunctional sheet for an aerosol generating article having an uneven portion (1) formed on at least one surface. For example, the maximum thickness (H2) of the multifunctional sheet (5) for an aerosol generating article may be the total thickness of the uneven portion (1b) distinguished from the recessed portion (1a). In some examples, the maximum thickness of the multifunctional sheet (5) for an aerosol generating article may be measured using any one selected from the group consisting of a confocal laser scanning microscope (CLSM), a scanning electron microscope (SEM), an optical microscope, a surface profiler, and combinations thereof.

[0053] The uneven portion (1) according to the present invention is defined as a portion formed by alternately repeating a recess (1a) and a protrusion (1b). The recess (1a) may be a portion that forms wrinkles in a multifunctional sheet (5) for an aerosol generating article, and the protrusion (1b) may refer to a portion where wrinkles are not formed, having a structure that alternately repeats with the recess (1a).

[0054] In this specification, “maximum depth (H1) of the uneven portion (1)” is defined as the maximum depth among several depths defined by the uneven portion with respect to the flat surface of the protruding portion (1b). Here, “flat” means substantially flat and may be defined as having a thickness deviation of about 1% or less, about 0.5% or less, about 0.1% or less, or about 0.01% or less. For example, since the uneven portion (1) is a superordinate term including the recessed portion (1a) and the protruding portion (1b), alternatively, the maximum depth (H1) of the uneven portion (1) may be the maximum depth of the recessed portion (1a). In some examples, the maximum depth (H1) of the uneven portion (1) may be measured using any one selected from the group consisting of a confocal laser scanning microscopy (CLSM), a scanning electron microscope (SEM), an optical microscope, a surface profiler, and combinations thereof.

[0055] The multifunctional sheet (5) for an aerosol generating article according to the present invention satisfies the following formula 1.

[0056] [Equation 1]

[0057] 0% < T = [(H1 / H2) X 100] ≤ 10%

[0058] In the above Equation 1, H2 is the maximum thickness of the multifunctional sheet for the aerosol generating article, H1 is the maximum depth of the uneven portion, and T is the ratio (percentage) of the maximum depth of the uneven portion to the maximum thickness of the multifunctional sheet for the aerosol generating article. Specifically, in the above Equation 1, T may be a parameter that affects swelling by forming fine gaps and voids between sheets, and affects the flow of aerosol by lowering the density of the sheet per unit volume within the rod. At the same time, in the above Equation 1, T may be a parameter that controls mechanical properties (e.g., tensile strength, elongation) when the multifunctional sheet for the aerosol generating article is molded into a rod shape.

[0059] In some embodiments of the present invention, T in Formula 1 may be 10% or less, 9% or less, 8% or less, 7% or less, 6% or less, 5% or less, 4% or less, 3% or less, 2% or less, 1% or less, 0.9% or less, 0.8% or less, 0.7% or less, 0.6% or less, 0.5% or less, 0.4% or less, 0.3% or less, 0.25% or less, 0.2% or less, or 0.1% or less, and specifically may be greater than 0% and less than or equal to any one of the plurality of upper limits. For example, T in Formula 1 may be greater than 0% and less than or equal to 5%, greater than 0% and less than or equal to 1%, or greater than 0% and less than or equal to 0.25%. In some embodiments of the present invention, by adjusting T of Equation 1 to the numerical range, the flow of the aerosol airflow can be improved to increase the amount of aerosol transferred, thereby enabling the realization of an effect with excellent flavor intensity. Specifically, by forming an uneven surface on the multifunctional sheet for the aerosol generating article, more aerosol can be transferred per unit volume within the rod compared to a sheet without an uneven surface. When such a multifunctional sheet for the aerosol generating article is molded into a rod shape, the swelling ability can be enhanced by forming fine gaps and voids between the sheets. Accordingly, the density of the sheet per unit volume is lowered, thereby improving the flow of the aerosol.

[0060] Meanwhile, centerline average roughness is the average value of the deviations of all peaks and valleys that deviate from the average line over the entire reference length of the roughness curve. For example, the centerline average roughness of the multifunctional sheet for the aerosol generating article can be measured by obtaining 3D shape data by scanning the sheet surface using a 3D profiler. As another example, the centerline average roughness of the multifunctional sheet for the aerosol generating article can be calculated from the height change of the sheet surface measured using a contact surface roughness measuring instrument or a non-contact surface roughness measuring instrument.

[0061] In some embodiments of the present invention, the arithmetic average roughness (Ra) of the multifunctional sheet for an aerosol generating article may be 0.01 μm or more, 0.05 μm or more, 0.1 μm or more, 0.15 μm or more, 0.2 μm or more, or 0.25 μm or more; 0.05 μm or less, 0.1 μm or less, 0.15 μm or less, 0.2 μm or less, 0.25 μm or less, or 0.30 μm or less; or any one or more of the plurality of lower limits and any one or less of the plurality of upper limits. In some embodiments of the present invention, by adjusting the arithmetic average roughness of the multifunctional sheet for an aerosol generating article to the above numerical range, the flow of the aerosol airflow can be improved to increase the amount of aerosol transfer, and accordingly, an effect of excellent taste intensity can be achieved. In some examples, any one surface selected from the group consisting of the nicotine sheet, paper filter, and plate-shaped leaf sheet described below can satisfy the centerline average roughness range described above.

[0062] In some other embodiments of the present invention, the above-described uneven portions (1) may be formed on both sides of the multifunctional sheet (5) for the aerosol generating article. Specifically, by forming the above-described uneven portions on both sides of the multifunctional sheet, the density of the sheet per unit volume is lowered, thereby further improving the flow of the aerosol and further lowering the suction resistance. Accordingly, the intensity of the sucking may be further increased.

[0063] The multifunctional sheet for an aerosol generating article according to the present invention comprises any one selected from the group consisting of a nicotine sheet, a paper filter, and a plate-shaped leaf sheet.

[0064] Below, each embodiment of a multifunctional sheet for aerosol generating articles will be described in detail.

[0065] Nicotine sheets

[0066] In this specification, "nicotine sheet" is defined as a sheet comprising any one selected from the group consisting of nicotine, nicotine salts, and combinations thereof, and not comprising tobacco material. Here, the nicotine sheet is distinguished from the plate-shaped leaf sheet comprising tobacco material described below.

[0067] In this specification, the term "tobacco material" is not particularly limited and may include tobacco raw materials such as tobacco leaves, tobacco stems, etc., and materials processed therefrom. For example, the tobacco material may include tobacco leaves; puffed tobacco veins; tobacco cut leaves such as leaf tobacco, plate-shaped leaf cut leaves, etc.; or tobacco sheets such as plate-shaped leaf sheets; granular tobacco; or liquid tobacco compositions; etc.

[0068] In some embodiments of the present invention, the maximum thickness of the nicotine sheet may be 80 µm or more and 240 µm or less. Specifically, the maximum thickness of the nicotine sheet may be 240 µm or less, 220 µm or less, 200 µm or less, 180 µm or less, 160 µm or less, 140 µm or less, 120 µm or less, 100 µm or less, or 90 µm or less, and specifically, may be 80 µm or more and less than or equal to any one of the plurality of upper limits. In some embodiments of the present invention, the effect of the present invention may be further enhanced as the maximum thickness of the nicotine sheet decreases. Generally, when wrinkles are formed on the surface of a sheet using a crimping processor in which a roll rotates, a problem may occur where the sheet tears easily when formed into a rod shape. For example, when formed into a rod shape, the sheet is formed into a rolled shape; however, if a thin sheet is crimped, it may tear easily during the rolling process. On the other hand, according to some embodiments of the present invention, a nicotine sheet can be easily formed into a rod shape by forming a fine irregularity of a thin depth relative to the crimping process, and thereby effectively improves the flow of aerosol airflow.

[0069] In some embodiments of the present invention, the maximum depth of the uneven surface formed on at least one surface of the nicotine sheet may be greater than 0 μm and less than or equal to 10 μm. Specifically, the maximum depth of the uneven portion within the nicotine sheet may be 10㎛ or less, 9㎛ or less, 8㎛ or less, 7㎛ or less, 6㎛ or less, 5㎛ or less, 4㎛ or less, 3㎛ or less, 2㎛ or less, 1㎛ or less, 0.9㎛ or less, 0.8㎛ or less, 0.7㎛ or less, 0.6㎛ or less, 0.5㎛ or less, 0.4㎛ or less, 0.3㎛ or less, 0.2㎛ or less, 0.1㎛ or less, 0.09㎛ or less, 0.08㎛ or less, 0.07㎛ or less, 0.06㎛ or less, 0.05㎛ or less, 0.04㎛ or less, 0.03㎛ or less, 0.02㎛ or less, or 0.01㎛ or less, and may be greater than 0㎛ or less than any one of the plurality of upper limits mentioned above. In some embodiments of the present invention, the maximum depth of the uneven portion of the nicotine sheet is adjusted to the numerical range, thereby improving the flow of the aerosol airflow to increase the amount of aerosol transfer, and accordingly, the effect of excellent smoky intensity can be achieved.

[0070] For example, the maximum thickness and maximum depth of the unevenness of the nicotine sheet may be measured using any one selected from the group consisting of a confocal laser scanning microscope (CLSM), a scanning electron microscope (SEM), an optical microscope, a surface profiler, and combinations thereof. As an example, the maximum thickness and maximum depth of the unevenness of the nicotine sheet may be measured by combining a micrograph of a sample obtained by vertically cutting the nicotine sheet and a contact profiler in which a probe moves along the surface of the sample to measure the depth.

[0071] The nicotine sheet according to the present invention may include a sheet-forming agent, an active ingredient, and an aerosol-forming substance.

[0072] The sheet-forming agent according to the present invention is a material that forms a nicotine sheet and can fix an active ingredient (nicotine and / or nicotine salt).

[0073] In some examples, the sheet-forming agent may include a cellulose-based material. Specifically, the cellulose-based material may include one or more selected from the group consisting of hydroxypropyl methylcellulose (HPMC), methylcellulose (MC), ethylcellulose (EC), and carboxymethylcellulose (CMC).

[0074] In some alternative or additional examples, the sheet-forming agent may include a hydrocolloid material. For example, the hydrocolloid material may include one or more selected from the group consisting of gelatin, agar, gellan gum, pectin, guar gum, xanthan gum, and glucomannan. Since the hydrocolloid material has viscosity of its own, it can be attached to the wrapper of an aerosol-generating article, etc., without a separate adhesive. This simplifies the placement process of the nicotine sheet and allows for freedom from safety issues caused by adhesives.

[0075] In some embodiments of the present invention, the content of the sheet-forming agent may be 25 parts by weight or more and 90 parts by weight or less per 100 parts by weight of the nicotine sheet. Specifically, the content of the sheet-forming agent may be 25 parts by weight or more, 30 parts by weight or more, 35 parts by weight or more, 40 parts by weight or more, 45 parts by weight or more, 50 parts by weight or more, 55 parts by weight or more, 60 parts by weight or more, 63 parts by weight or more, or about 64.8 parts by weight or more per 100 parts by weight of the nicotine sheet; and 65 parts by weight or less, 70 parts by weight or less, 75 parts by weight or less, 80 parts by weight or less, 85 parts by weight or less, or 90 parts by weight or less. In some embodiments of the present invention, excellent mechanical properties of the nicotine sheet can be achieved by controlling the content of the sheet-forming agent to the above numerical range.

[0076] In this specification, the active ingredient is defined as any one selected from the group consisting of nicotine, nicotine salts, and combinations thereof. In this case, the nicotine salt may be formed from a combination of nicotine and an organic acid.

[0077] For example, the organic acid may include one or more selected from the group consisting of benzoic acid, pyruvic acid, lactic acid, acetic acid, and citric acid. In some examples, the organic acid and the nicotine may react in a molar ratio of 1:1.

[0078] In some embodiments of the present invention, the content of the active ingredient may be 2 parts by weight or more, 3 parts by weight or more, 4 parts by weight or more, or about 4.2 parts by weight or more per 100 parts by weight of the nicotine sheet; and 5 parts by weight or less, 6 parts by weight or less, 7 parts by weight or less, 8 parts by weight or less, 9 parts by weight or less, or 10 parts by weight or less. In some embodiments of the present invention, by adjusting the content of the active ingredient to the above numerical range, smoking satisfaction can be provided to the user through a soft throat hit.

[0079] In this specification, "aerosol" may be defined as a mixture in which fine solid particles or liquid droplets are mixed with air or other gases to form a suspension.

[0080] The aerosol-forming material according to the present invention can form an aerosol when an aerosol-generating article is inserted into the interior of an aerosol-generating device and heated.

[0081] In some embodiments of the present invention, the content of the aerosol-forming substance may be 6 parts by weight or more and 18 parts by weight or less per 100 parts by weight of the nicotine sheet. Specifically, the content of the aerosol-forming substance may be 6 parts by weight or more, 7 parts by weight or more, 8 parts by weight or more, 9 parts by weight or more, 10 parts by weight or more, 11 parts by weight or more, or 12 parts by weight or more per 100 parts by weight of the nicotine sheet; and 13 parts by weight or less, 14 parts by weight or less, 15 parts by weight or less, 16 parts by weight or less, 17 parts by weight or less, or 18 parts by weight or less. In some embodiments of the present invention, by controlling the content of the aerosol-forming substance to the above numerical range, the amount of aerosol transfer is sufficiently high, and at the same time, the heat sensation felt by the smoker can be effectively controlled.

[0082] For example, the aerosol-forming material may include one or more selected from the group consisting of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol.

[0083] In some other embodiments of the present invention, the nicotine sheet may further comprise any one selected from the group consisting of moisture (water), a bulking agent, and combinations thereof.

[0084] For example, the moisture content in the nicotine sheet is not particularly limited, but may be 15 parts by weight or less, or 1 part by weight or more and 15 parts by weight or less, per 100 parts by weight of the nicotine sheet. Specifically, the moisture content may be 1 part by weight or more, 2 parts by weight or more, 3 parts by weight or more, 4 parts by weight or more, 5 parts by weight or more, 6 parts by weight or more, 7 parts by weight or more, 8 parts by weight or more, 9 parts by weight or more, or 10 parts by weight or more; and 11 parts by weight or less, 12 parts by weight or less, 13 parts by weight or less, 14 parts by weight or less, or 15 parts by weight or less. Here, the moisture content is measured under conditions of 23°C and 50% RH and can be analyzed by calculating the weight change of the sheet described above after sufficiently drying the multifunctional sheet for aerosol generating articles.

[0085] For example, the bulking agent may be an additive that increases the volume of the nicotine sheet without affecting the active ingredient.

[0086] In some examples, the bulking agent may be modified starch or starch hydrolysate.

[0087] For example, the above modified starch may refer to acetic acid starch, oxidized starch, hydroxypropyl phosphate distarch, hydroxypropyl starch, phosphate distarch, phosphate monostarch, phosphate distarch, etc.

[0088] For example, the above-mentioned starch hydrolysate refers to a substance obtained by a process including a process of hydrolyzing starch. The starch hydrolysate may include, for example, a substance obtained by directly hydrolyzing starch (i.e., dextrin), or a substance obtained by hydrolyzing starch after heat treatment (i.e., indigestible dextrin). In this case, the bulking agent may be, for example, dextrin, and more specifically, beta-cyclodextrin. The starch hydrolysate may generally be a starch hydrolysate having a DE value in the range of about 2 to about 40, preferably a starch hydrolysate having a DE value in the range of about 2 to about 20. Here, "DE" is an abbreviation for dextrose equivalent, and the DE value indicates the degree of starch hydrolysis, that is, the saccharification rate of starch. The DE value may be a value measured by the Willstatter-Schudel method. The characteristics of hydrolyzed starch (starch hydrolysate), such as the molecular weight or the arrangement of sugar molecules constituting the starch hydrolysate, are not constant for each molecule but exist with a certain distribution or variation. Due to the distribution or variation of the characteristics of the starch hydrolysate, or differences in the cutting range, different physical properties (e.g., DE) may be exhibited for each molecule of the starch hydrolysate. Thus, although the starch hydrolysate is a collection of molecules exhibiting different physical properties, the measurement result (e.g., DE) from the Willstatter-Schudel method is treated as a representative value indicating the degree of starch hydrolysis. In some examples, the starch hydrolysate may be selected from the group consisting of dextrin having a DE value of about 2 to about 5, indigestible dextrin having a DE value of about 10 to about 15, and mixtures thereof.

[0089] In some embodiments of the present invention, the content of the bulking agent may be 5 parts by weight or more, 6 parts by weight or more, 7 parts by weight or more, 8 parts by weight or more, or 9 parts by weight or more, based on 100 parts by weight of the nicotine sheet; and 10 parts by weight or less, 11 parts by weight or less, 12 parts by weight or less, or 13 parts by weight or less. In some embodiments of the present invention, by adjusting the content of the bulking agent to the above numerical range, the volume of the nicotine sheet can be increased to an appropriate level while simultaneously providing sufficient smoking satisfaction to the user.

[0090] paper filter

[0091] In this specification, "paper filter" is defined as a product manufactured by using pulp as a material and undergoing extraction, pulping, refining, paper formation, and drying processes.

[0092] At least one surface of the paper filter according to the present invention may have an uneven surface formed thereon. Specifically, on the uneven surface of the paper filter, recesses and protrusions may be alternately and repeatedly arranged.

[0093] In some embodiments of the present invention, the maximum thickness of the paper filter may be 20 μm or more and 80 μm or less. For example, the maximum thickness of the paper filter may be 80 μm or less, 70 μm or less, 60 μm or less, 50 μm or less, 40 μm or less, or 30 μm or less, and specifically, may be 20 μm or more and any one of the plurality of upper limits or less. In some embodiments of the present invention, by adjusting the maximum thickness of the paper filter to the above numerical range, filter performance can be maintained while improving the flow of aerosol airflow to increase the amount of aerosol transfer, and accordingly, an effect of excellent flavor intensity can be achieved.

[0094] In some embodiments of the present invention, the maximum depth of the uneven surface formed on at least one surface of the paper filter may be greater than 0 μm and less than or equal to 10 μm. Specifically, the maximum depth of the uneven surface formed on at least one surface of the paper filter may be 10㎛ or less, 9㎛ or less, 8㎛ or less, 7㎛ or less, 6㎛ or less, 5㎛ or less, 4㎛ or less, 3㎛ or less, 2㎛ or less, 1㎛ or less, 0.9㎛ or less, 0.8㎛ or less, 0.7㎛ or less, 0.6㎛ or less, 0.5㎛ or less, 0.4㎛ or less, 0.3㎛ or less, 0.2㎛ or less, 0.1㎛ or less, 0.09㎛ or less, 0.08㎛ or less, 0.07㎛ or less, 0.06㎛ or less, 0.05㎛ or less, 0.04㎛ or less, 0.03㎛ or less, 0.02㎛ or less, or 0.01㎛ or less, and may be greater than 0㎛ or less than any one of the plurality of upper limits. In some embodiments of the present invention, the maximum depth of the uneven surface is adjusted to the numerical range, thereby maintaining filter performance while improving the flow of aerosol airflow to increase the amount of aerosol transfer, and accordingly, the effect of excellent flavor intensity can be achieved.

[0095] Meanwhile, the basis weight of the paper filter is the weight per unit area of ​​the paper filter. For example, the basis weight of the paper filter can be measured in accordance with KS M ISO 536.

[0096] In some embodiments of the present invention, the basis weight of the paper filter is 15 g / m² 2 40 g / m² or more 2 It may be less than or equal to. Specifically, the basis weight of the above paper filter is 40 g / m² 2 Below, 30 g / m² 2 Below, 29g / m² 2 Below, 28g / m² 2 Below, 27g / m² 2 Below, 26g / m² 2 Below, 25g / m² 2 Below, 24g / m² 2 Below, 23g / m² 2 Below, 22g / m² 2 Below, 21g / m² 2Below, 20g / m² 2 Below, 19g / m² 2 Below, 18g / m² 2 Below, 17g / m² 2 Less than or equal to 16 g / m² 2 Less than or equal to 15 g / m² 2 The above may be less than or equal to any one of the above multiple upper limits. In some embodiments of the present invention, the basis weight of the paper filter is adjusted to the above numerical range to maintain filter performance while improving the flow of aerosol airflow to increase the amount of aerosol transfer, thereby enabling the realization of an effect with excellent flavor intensity.

[0097] For example, the type of pulp mentioned above is not particularly limited and may be any one selected from the group consisting of wood pulp, tobacco barley pulp and mixtures thereof.

[0098] For example, the above paper filter is not particularly limited and may specifically be a monofilter, a double filter, or a triple filter.

[0099] Plate-shaped leaf sheet

[0100] In this specification, the term "plate leaf sheet" may refer to a paper-type plate leaf sheet used in combustion-type cigarettes or a slurry-type plate leaf sheet used in heating-type cigarettes, specifically a slurry-type plate leaf sheet. While a paper-type plate leaf sheet is manufactured using a paper machine, a slurry-type plate leaf sheet may be manufactured by casting a slurry containing a solvent (e.g., water) onto a substrate.

[0101] In some embodiments of the present invention, the maximum thickness of the plate-shaped leaf sheet may be 80 μm or more and 150 μm or less. Specifically, the maximum thickness of the plate-shaped leaf sheet may be 150 μm or less, 140 μm or less, 130 μm or less, 120 μm or less, 110 μm or less, 100 μm or less, or 90 μm or less, and specifically, may be 80 μm or more and any one of the plurality of upper limits or less. In some embodiments of the present invention, by adjusting the maximum thickness of the plate-shaped leaf sheet to the above numerical range, the medium performance can be maintained while improving the flow of the aerosol airflow to increase the amount of aerosol transfer, and accordingly, the effect of excellent flavor intensity can be realized.

[0102] In some embodiments of the present invention, the maximum depth of the unevenness formed on at least one surface of the plate-shaped leaf sheet may be greater than 0 μm and less than or equal to 10 μm. Specifically, the maximum depth of the unevenness formed on at least one surface of the plate-shaped leaf sheet may be 10㎛ or less, 9㎛ or less, 8㎛ or less, 7㎛ or less, 6㎛ or less, 5㎛ or less, 4㎛ or less, 3㎛ or less, 2㎛ or less, 1㎛ or less, 0.9㎛ or less, 0.8㎛ or less, 0.7㎛ or less, 0.6㎛ or less, 0.5㎛ or less, 0.4㎛ or less, 0.3㎛ or less, 0.2㎛ or less, 0.1㎛ or less, 0.09㎛ or less, 0.08㎛ or less, 0.07㎛ or less, 0.06㎛ or less, 0.05㎛ or less, 0.04㎛ or less, 0.03㎛ or less, 0.02㎛ or less, or 0.01㎛ or less, and may be greater than 0㎛ and less than or equal to any one of the plurality of upper limits. In some embodiments of the present invention, the maximum depth of the uneven portion of the plate-shaped leaf sheet is adjusted to the numerical range, thereby maintaining the medium performance while improving the flow of the aerosol airflow to increase the amount of aerosol transfer, and accordingly, the effect of excellent taste intensity can be achieved.

[0103] In some embodiments of the present invention, the plate-shaped leaf sheet may include tobacco raw material, a humectant, a binder, and pulp.

[0104] The tobacco raw material according to the present invention may be a raw material containing an active ingredient of a plate-shaped leaf sheet. For example, the tobacco raw material may include at least one of a yellow variety, a Burley variety, an Oriental variety, and a cigar variety.

[0105] For example, the content of the above tobacco raw material is not particularly limited, but may be 30 parts by weight or more, 35 parts by weight or more, 40 parts by weight or more, 45 parts by weight or more, 50 parts by weight or more, 55 parts by weight or more, 60 parts by weight or more, 65 parts by weight or more, or 70 parts by weight or more with respect to 100 parts by weight of the above plate leaf sheet; 35 parts by weight or less, 40 parts by weight or less, 45 parts by weight or less, 50 parts by weight or less, 55 parts by weight or less, 60 parts by weight or less, 65 parts by weight or less, 70 parts by weight or less, 75 parts by weight or less, 80 parts by weight or less, 85 parts by weight or less, or 90 parts by weight or less; or any one of the above multiple lower limits or any one of the above multiple upper limits or less.

[0106] The moisturizer according to the present invention can be included in the plate-shaped leaf sheet to minimize the occurrence of off-flavors and enhance overall smoking sensory characteristics.

[0107] For example, the content of the humectant is not particularly limited, but may be 1 part by weight or more, 2 parts by weight or more, 3 parts by weight or more, 4 parts by weight or more, 5 parts by weight or more, 6 parts by weight or more, 7 parts by weight or more, 8 parts by weight or more, or 9 parts by weight or more per 100 parts by weight of the plate-shaped leaf sheet; 2 parts by weight or less, 3 parts by weight or less, 4 parts by weight or less, 5 parts by weight or less, 6 parts by weight or less, 7 parts by weight or less, 8 parts by weight or less, 9 parts by weight or less, or 10 parts by weight or less; or any one of the plurality of lower limits or more and any one of the plurality of upper limits or less.

[0108] For example, the above moisturizer may include one or more selected from the group consisting of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol.

[0109] The binder according to the present invention binds the crushed tobacco material in the plate leaf slurry and can maintain the mechanical strength of the plate leaf sheet.

[0110] For example, the content of the binder is not particularly limited, but may be 1 part by weight or more, 2 parts by weight or more, 3 parts by weight or more, 4 parts by weight or more, 5 parts by weight or more, 6 parts by weight or more, 7 parts by weight or more, 8 parts by weight or more, 9 parts by weight or more, 10 parts by weight or more, 11 parts by weight or more, 12 parts by weight or more, 15 parts by weight or more, or 20 parts by weight or more with respect to 100 parts by weight of the plate-shaped leaf sheet; 2 parts by weight or less, 3 parts by weight or less, 4 parts by weight or less, 5 parts by weight or less, 6 parts by weight or less, 7 parts by weight or less, 8 parts by weight or less, 9 parts by weight or less, 10 parts by weight or less, 15 parts by weight or less, 20 parts by weight or less, 25 parts by weight or less, 30 parts by weight or less, or 35 parts by weight or less; or any one of the plurality of lower limits or any one of the plurality of upper limits or less.

[0111] For example, the binder is not particularly limited but may be any one selected from the group consisting of guar gum, arabic gum, and mixtures thereof.

[0112] The pulp according to the present invention can strengthen the mechanical strength of the plate-shaped leaf sheet and form pores of the plate-shaped leaf sheet by forming a fiber network. Accordingly, the flow of aerosol can be controlled. For example, the pulp may be a cellulose-based pulp.

[0113] For example, the content of the pulp may be 1 part by weight or more, 2 parts by weight or more, 3 parts by weight or more, 4 parts by weight or more, 5 parts by weight or more, 6 parts by weight or more, 7 parts by weight or more, 8 parts by weight or more, or 9 parts by weight or more, based on 100 parts by weight of the plate-shaped leaf sheet; 2 parts by weight or less, 3 parts by weight or less, 4 parts by weight or less, 5 parts by weight or less, 6 parts by weight or less, 7 parts by weight or less, 8 parts by weight or less, 9 parts by weight or less, or 10 parts by weight or less; or any one of the plurality of lower limits or more and any one of the plurality of upper limits or less.

[0114] 2. Method for manufacturing a multifunctional sheet for aerosol generating articles

[0115] According to another aspect of the present invention, a method for manufacturing a multifunctional sheet for an aerosol generating article is provided, comprising: (S1) preparing a preliminary multifunctional sheet selected from the group consisting of a nicotine sheet, a paper filter, and a plate-shaped leaf sheet; and (S2) manufacturing a multifunctional sheet for an aerosol generating article by corona discharge treatment of at least one surface of the preliminary multifunctional sheet.

[0116] The preliminary multifunctional sheet according to the present invention may be a sheet prior to corona discharge treatment in which no irregularities are formed.

[0117] Specifically, the corona discharge treatment described above is a method in which high voltage is applied between two electrodes (discharge electrode, bottom electrode) to generate high frequency waves, which ionize the air between the discharge electrode and the pre-multifunctional sheet to generate charged particles, and these particles induce a change in the surface of the pre-multifunctional sheet. Such change in the surface may include the formation of fine irregularities.

[0118] In some embodiments of the present invention, the step (S2) may include a step of processing with a voltage of 20 kV or more and 40 kV or less and a frequency of 20 kHz or more and 40 kHz or less.

[0119] In some embodiments of the present invention, the voltage of step (S2) may be 20 kV or more, 25 kV or more, or 30 kV or more; 22 kV or less, 25 kV or less, 30 kV or less, 32 kV or less, 34 kV or less, 35 kV or less, 37 kV or less, or 40 kV or less; or any one or more of the plurality of lower limits and any one or less of the plurality of upper limits. In some embodiments of the present invention, by adjusting the voltage to the above numerical range, the electric field between the electrodes is strengthened, so that the ratio of the maximum depth of the uneven portion can be adjusted to an appropriate level. Accordingly, the flow of the airflow through which the aerosol is transported can be further improved.

[0120] In some embodiments of the present invention, the frequency of step (S2) may be 20 kHz or more, 25 kHz or more, or 30 kHz or more; and 32 kHz or less, 34 kHz or less, 35 kHz or less, 37 kHz or less, or 40 kHz or less. In some embodiments of the present invention, by adjusting the frequency to the above numerical range, the ratio of the maximum depth of the uneven portion can be adjusted to an appropriate level. Accordingly, the flow of the airflow through which the aerosol is transported can be further improved.

[0121] For example, a corona discharge processor commercially available in the relevant technical field may be used for the above corona discharge treatment.

[0122] In some embodiments of the present invention, the moving speed of the preliminary multifunctional sheet may be 0.1 m / min or more, 1 m / min or more, 2 m / min or more, 3 m / min or more, 4 m / min or more, 5 m / min or more, 10 m / min or more, 15 m / min or more, 20 m / min or more, 25 m / min or more, 30 m / min or more, 35 m / min or more, 40 m / min or more, or 45 m / min or more; 6 m / min or less, 7 m / min or less, 8 m / min or less, 9 m / min or less, 10 m / min or less, 20 m / min or less, 30 m / min or less, 45 m / min or less, 50 m / min or less, or 60 m / min or less; or any one or more of the plurality of lower limits and any one or less of the plurality of upper limits. Here, the moving speed of the preliminary multifunctional sheet may be a concept corresponding to the corona discharge treatment time. In some embodiments of the present invention, the movement speed of the preliminary multifunctional sheet is adjusted to the numerical range, thereby allowing the ratio of the maximum depth of the uneven portion to be adjusted to an appropriate level. Accordingly, the flow of the airflow through which the aerosol is transported can be further improved.

[0123] In some embodiments of the present invention, the method for manufacturing the nicotine sheet may include the step of manufacturing a preliminary nicotine sheet by applying a slurry for forming a nicotine sheet onto one surface of a substrate by a casting method and then drying it, and the step of treating at least one surface of the preliminary nicotine sheet with corona discharge under the process conditions described above.

[0124] In some embodiments of the present invention, the method for manufacturing the paper filter may include the step of preparing a preliminary paper filter by using pulp as a material and undergoing extraction, pulping, refining, paper formation, and drying processes; and the step of treating at least one surface of the preliminary paper filter with corona discharge under the process conditions described above.

[0125] In some embodiments of the present invention, the method for manufacturing the plate-shaped leaf sheet may include the steps of: preparing a tobacco raw material; adding a solvent to the prepared tobacco raw material to produce a slurry; drying the slurry to produce a plate-shaped leaf sheet; and treating at least one surface of the plate-shaped leaf sheet with corona discharge under the process conditions described above.

[0126] 3. Aerosol-generating items

[0127] In this specification, "longitudinal direction" may mean a direction corresponding to the longitudinal axis of the aerosol generating article.

[0128] In this specification, "Configured to" may be used interchangeably with, depending on some embodiments, for example, "Suitable for," "Having the capacity to," "Designed to," "Adapted to," "Made to," or "Capable of." The term "Configured to" may not necessarily mean "Specifically designed to" in hardware. Instead, in some embodiments, the expression "device configured to" may mean that the device is "capable of" together with other devices or components. For example, the paper filter, nicotine sheet, or plate leaf sheet described in the following paragraph shall be interpreted in accordance with the definitions set forth above.

[0129] According to another aspect of the present invention, an aerosol generating article is provided, comprising at least one filter portion and a medium portion disposed on one side of the filter portion, wherein at least one of the filter portion and the medium portion comprises a multifunctional sheet for an aerosol generating article of some embodiment, the paper filter is configured to be included in the filter portion, and the nicotine sheet or the plate-shaped leaf sheet is configured to be included in the medium portion.

[0130] FIG. 3 shows an aerosol generating article according to one embodiment of the present invention.

[0131] In this specification, "Upstream" or "upstream direction" refers to a direction away from the user's bend using the aerosol generating article, and "Downstream" or "downstream direction" may refer to a direction closer to the user's bend. The terms upstream and downstream may be used to describe the relative positions of the elements constituting the aerosol generating article.

[0132] Referring to FIG. 3, the aerosol generating article (100) according to the present invention includes a filter section (10) and a medium section (20). Specifically, the filter section (10) and the medium section (20) may be arranged continuously along the longitudinal direction, and more specifically, the medium section (20) may be located upstream and the filter section (10) may be located downstream.

[0133] The filter unit (10) according to the present invention can filter smoke and / or aerosol generated in the medium unit (20). In some examples, the filter unit (10) may include activated carbon, which is common in the art.

[0134] A medium section (20) according to the present invention is disposed on one side of the filter section (10). Specifically, the medium section (20) may include a medium that generates smoke and / or aerosol as it burns.

[0135] In this specification, the term "medium" is not particularly limited and may be any material commonly used in the art that can generate smoke and / or aerosol. Specifically, the medium may include tobacco raw materials such as tobacco leaf pieces, tobacco stems, etc., and materials processed therefrom. As a more specific example, the medium may include crushed tobacco leaves, puffed main veins, tobacco cut leaves (e.g., leaf tobacco cut leaves, plate leaf cut leaves), tobacco sheets (e.g., plate leaves), etc.

[0136] In some examples, the medium may further include one or more additives among humectants and flavoring agents. For example, the humectant can maintain the moisture in the medium at an appropriate level to soften the characteristic taste and increase the vapor production. Specifically, the humectant may include at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol. For example, the flavoring agent may be added to enhance the flavor. Specifically, the above flavoring agent may include licorice, sucrose, fructose syrup, isosweet, cocoa, lavender, cinnamon, cardamom, celery, fenugreek, cascarilla, sandalwood, bergamot, geranium, honey essence, rose oil, vanilla, lemon oil, orange oil, mint oil, caraway, cognac, jasmine, chamomile, menthol, ylang-ylang, sage, spearmint, ginger, coriander, clove extract, or coffee, etc.

[0137] In some embodiments of the present invention, the paper filter described above may be configured to be included in the filter section (10). In some embodiments of the present invention, by configuring the paper filter to be included in the filter section, filter performance can be maintained while improving the flow of aerosol airflow to increase the amount of aerosol transfer, thereby enabling the realization of an effect with excellent flavor intensity.

[0138] Although not illustrated in FIG. 3, in some other embodiments of the present invention, the paper-type plate-shaped leaf sheet may be configured to be included in the medium portion (20).

[0139] FIG. 4 shows an aerosol generating article according to another embodiment of the present invention.

[0140] Referring to FIG. 4, the aerosol generating article (100) according to the present invention comprises first to fourth parts (SEG1, SEG2, SEG3, SEG4). Specifically, the first to fourth parts (SEG1, SEG2, SEG3, SEG4) may be arranged side by side in the longitudinal direction (L) of the aerosol generating article (100). More specifically, the second part (SEG2) may be interposed between the first part (SEG1) and the third part (SEG3), and the third part (SEG3) may be interposed between the second part (SEG2) and the fourth part (SEG4). For example, the thickness direction (T) may be a direction that intersects the longitudinal direction (L) of the aerosol generating article (100).

[0141] In one embodiment of the present invention, the first part (SEG1) can function as a medium in an internally heated aerosol generating article. Specifically, the first part (SEG1) is heated by a needle (internal heating element) provided in an aerosol generating device, so that the aerosol can be transferred in the longitudinal direction (L). At this time, as shown in FIG. 4 (a), a plate-shaped leaf sheet of some embodiments may be included in the first part (SEG1). In this case, the flow of the aerosol airflow can be improved to increase the amount of aerosol transferred, and accordingly, an effect of excellent flavor intensity can be achieved. In the internally heated aerosol generating article described above, the second part (SEG2) may include a hollow filter that filters the aerosol transferred from the first part (SEG1), the third part (SEG3) may include a cooling filter (e.g., a paper tube) that cools the transferred aerosol, and the fourth part (SEG4) may include a cellulose acetate filter. For example, the paper filter described above may be included in at least one of the second to fourth parts (SEG2, SEG3, SEG4).

[0142] In another embodiment of the present invention, the first part (SEG1) can perform a filter function in an externally heated aerosol generating article. Unlike an internally heated aerosol generating article in which a heating element is set to be inserted into the interior of the first part, the heating element of the externally heated aerosol generating article may be placed on the outer surface of at least one of the first part and the second part to heat the outer surface. At this time, the first part (SEG1) can perform the function of filtering aerosol supplied from an external vaporizer (cartridge), which is a device separate from the aerosol generating article. In the externally heated aerosol generating article described above, the second part (SEG2) can function as a medium part. Accordingly, as shown in FIG. 4(b), a nicotine sheet or a plate-shaped leaf sheet of some embodiments is included in the second part (SEG2) to improve the flow of the aerosol airflow, thereby increasing the amount of aerosol transfer and thereby achieving an effect of excellent smoky intensity. Additionally, the third part (SEG3) may include a hollow filter, and the fourth part (SEG4) may include a cellulose acetate filter. For example, the above-described paper filter may be included in at least one of the first part (SEG1), the third part (SEG3), and the fourth part (SEG4).

[0143] According to another embodiment of the present invention, in an externally heated aerosol generating article, a first part (SEG1) may comprise a filter element impregnated with an aerosol-forming material. Unlike the embodiment described in the preceding paragraph, the aerosol-forming material is impregnated into the filter element so that the first part (SEG1) can be heated without an external vaporizer, thereby allowing the aerosol to be formed and transferred. Here, the aerosol-forming material may be the same as or different from the aerosol-forming material described above. For example, the filter element may comprise cellulose acetate. In some examples, the filter element may be an assembly (tow) of continuous filaments made of cellulose acetate. In some examples, the filter element may comprise a hollow formed elongated along the longitudinal direction of the aerosol generating article (100). Here, the hollow may penetrate the filter element. Here, the cross-sectional shape of the hollow is not particularly limited and may specifically be Y-shaped, X-shaped, or circular. Meanwhile, the second part (SEG2) can function as a medium. Accordingly, as shown in FIG. 4(b), a nicotine sheet or a plate-shaped leaf sheet of some embodiment is included in the second part (SEG2) to improve the flow of aerosol airflow, thereby increasing the amount of aerosol transfer and thus achieving an effect of excellent smoky intensity. The third part (SEG3) may include a hollow filter, and the fourth part (SEG4) may include a cellulose acetate filter. For example, the above-described paper filter may be included in at least one of the third part (SEG3) and the fourth part (SEG4).

[0144] In this specification, terms such as “about” or “substantially” mean a reasonable amount of variation of a term modified so as not to significantly alter the final result. Such terms may be interpreted to include a deviation of at least ±5% or at least ±10% relative to the stated value, to the extent that the deviation does not alter or invalidate the meaning of the word.

[0145] Hereinafter, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the present invention; however, this is merely an example, and the scope of the present invention is not limited by the following.

[0146] [Manufacturing Example 1: Manufacture of a multifunctional sheet for aerosol generating articles]

[0147] <Comparative Example 1: Nicotine sheet not treated with corona discharge>

[0148] A composition for forming a nicotine sheet was applied to one side of a substrate by a casting method and then dried to produce a nicotine sheet (thickness: about 200 μm) having the weight ratio shown in Table 1 below.

[0149] Content (parts by weight) Hydroxypropyl Methylcellulose (HPMC, Grade B) 6 4.8 Beta-Cyclodextrin 9 Nicotine 2.4 Organic Acid (Benzoic Acid) 1.8 Moisture 10 Propylene Glycol 6 Glycerin 6 Total 100

[0150] <Comparative Example 2: Nicotine sheet subjected to crimping process>

[0151] A nicotine sheet (thickness: about 200 μm) according to Comparative Example 1 above was subjected to a crimping process to form irregularities (wrinkles) on the surface of the nicotine sheet.

[0152] <Example 1: Corona Discharge Treated Nicotine Sheet>

[0153] An uneven surface was formed on the surface of the nicotine sheet according to Comparative Example 1 using a corona discharge treatment device under the conditions according to Table 2 below. Specifically, the corona discharge treatment is a method in which high voltage is applied between two electrodes (discharge electrode, bottom electrode) to generate high frequency waves, which ionize the air between the discharge electrode and the pre-multifunctional sheet to generate charged particles, and these particles induce a change in the surface of the pre-multifunctional sheet.

[0154] Classification: Corona Discharge Treatment Process Conditions: Corona Discharge Treatment Time (Nicotine Sheet Movement Speed): 50 m / min Distance between Discharge Electrode and Bottom Electrode: 1.5 mm Voltage: Approx. 20 kV Frequency: Approx. 30 kHz

[0155] [Experimental Example: Performance Evaluation of Multifunctional Sheets]

[0156] Measurement of maximum sheet thickness and depth of unevenness:

[0157] The maximum thickness and maximum depth of the unevenness of the multifunctional sheet were measured using a confocal laser scanning microscope (CLSM), a scanning electron microscope (SEM), an optical microscope, and a surface profiler. As shown in FIG. 2, the maximum thickness of the multifunctional sheet for aerosol generating articles is defined as H2, and the maximum depth of the unevenness is defined as H1.

[0158] Evaluation of sheet tearing:

[0159] The sheets of Comparative Examples 1 and 2 and Example 1 were each implemented into a rod shape. At this time, each sheet was visually observed to see if any tearing issues occurred. If the sheet did not tear, it was evaluated as "maintained," and if the sheet tore, it was evaluated as "torn."

[0160] Measurement of suction resistance of the medium:

[0161] The inhalation resistance of a medium rod (length: approximately 12 mm) containing a nicotine sheet was measured using an individual inhalation resistance measuring device (equipment name: KARDIEN IPT-1).

[0162] Measurement of aerosol migration volume and flavor intensity

[0163] The aerosol transfer amount and taste intensity of the aerosol generating product were evaluated by 20 experts with experience in sensory evaluation in the field of aerosol generating products using a 7-point scale after inhaling about 14 puffs.

[0164] Classification Comparative Example 1 Comparative Example 2 Example 1 Sheet Width 160 mm 160 mm 160 mm Maximum Sheet Thickness (H2) 200 µm 200 µm 200 µm Maximum Depth of Unevenness (H1) - 50 µm 0.5 µm Ratio of Maximum Sheet Thickness to Maximum Unevenness Depth (T=[H1 / H2]x100) - 25% 0.25% Corona Discharge Treatment XX (Crimping Process) O Problem of tearing during thin sheet manufacturing Retained Tearing (Inferiority) Retained Circumference of Medium (mm) approx. 22 mm Manufacturable approx. 22 mm Medium Suction Resistance (mmH2O) approx. 70 mmH2O Unmeasurable approx. 67 mmH2O Aerosol Migration Amount 4.7 points Unmeasurable 5.3 points Sticky Intensity 3.4 points Unmeasurable 3.8 points

[0165] Referring to Comparative Example 1 in Table 3 above, it was confirmed that there are problems such as high inhalation resistance, low inhalation intensity, and low aerosol transfer amount because wrinkles or unevenness are not formed on the surface of the nicotine sheet.

[0166] In addition, referring to Comparative Example 2, it was confirmed that when an uneven surface is formed on the surface of a sheet using a crimping process common in the relevant technical field, the problem of easy tearing occurs during the process of forming it into a rod shape.

[0167] On the other hand, it was confirmed that Example 1 lowered the ratio of the maximum depth of the uneven portion to the maximum thickness of the sheet by corona discharge treatment on the surface of the sheet compared to Comparative Examples 1 and 2. Through this, the effect of Example 1 was confirmed, which improved airflow compared to Comparative Example 1, thereby lowering suction resistance and increasing the amount of aerosol transfer. In addition, when comparing Comparative Example 2 and Example 1, the effect of Example 1 was confirmed, which did not easily tear during the process of forming into a rod shape and had excellent mechanical properties, unlike Comparative Example 2, which was crimped even under conditions where the sheet thickness was thin.

[0168] The features described in the above-described embodiment may be combined with other embodiments unless explicitly stated otherwise. Furthermore, although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

[0169] [Explanation of the symbol]

[0170] 1: Uneven parts

[0171] 1a: Temptress 1b: Immature woman

[0172] 5: Multifunctional sheet for aerosol generating products

[0173] H2: Maximum thickness of multifunctional sheets for aerosol generating products

[0174] H1: Maximum depth of unevenness 100: Aerosol generating item

[0175] 10: Filter section 20: Medium section

[0176] SEG1: Part 1 SEG2: Part 2

[0177] SEG3: Part 3 SEG4: Part 4

[0178] T: Thickness direction L: Length direction

Claims

1. A multifunctional sheet for an aerosol generating article comprising an uneven surface on at least one surface, The above-mentioned multifunctional sheet for aerosol generating articles is, It comprises any one selected from the group consisting of nicotine sheets, paper filters, and plate-shaped leaf sheets, and A multifunctional sheet for aerosol generating articles satisfying Formula 1 below: [Equation 1] 0% < T = [(H1 / H2) X 100] ≤ 10% In the above Equation 1, H2 is the maximum thickness of the multifunctional sheet for the aerosol generating article, and H1 is the maximum depth of the above-mentioned uneven portion, and T is the ratio of the maximum depth of the uneven portion to the maximum thickness of the multifunctional sheet for the aerosol generating article.

2. In Paragraph 1, In the above Equation 1, T is greater than 0% and less than or equal to 1%, Multifunctional sheet for aerosol generating products.

3. In Paragraph 1, In the above Equation 1, T is greater than 0% and less than or equal to 0.25%, Multifunctional sheet for aerosol generating products.

4. In Paragraph 1, The maximum thickness of the above nicotine sheet is 80㎛ or more and 240㎛ or less, Multifunctional sheet for aerosol generating products.

5. In Paragraph 1, The maximum thickness of the above paper filter is 20 µm or more and 80 µm or less, Multifunctional sheet for aerosol generating products.

6. In Paragraph 1, The basis weight of the above paper filter is 15 g / m² 2 40 g / m² or more 2 Lee Ha-in, Multifunctional sheet for aerosol generating products.

7. In Paragraph 1, The maximum thickness of the above plate-shaped leaf sheet is 80 μm or more and 150 μm or less, Multifunctional sheet for aerosol generating products.

8. (S1) A step of preparing a preliminary multifunctional sheet selected from the group consisting of a nicotine sheet, a paper filter, and a plate-shaped leaf sheet; and (S2) a step of manufacturing a multifunctional sheet for an aerosol generating article by corona discharge treating at least one surface of the above-mentioned preliminary multifunctional sheet; comprising, Method for manufacturing a multifunctional sheet for aerosol generating articles.

9. In Paragraph 8, The above (S2) step is: A step comprising processing with a voltage of 20 kV or more and 40 kV or less and a frequency of 20 kHz or more and 40 kHz or less, Method for manufacturing a multifunctional sheet for aerosol generating articles.

10. A filter section comprising at least one; and A medium portion disposed on one side of the filter portion; comprising, At least one of the above filter section and the above medium section is A multifunctional sheet for an aerosol generating article according to any one of paragraphs 1 to 7, comprising The above paper filter is configured to be included in the filter section, and The above nicotine sheet, or the above plate-shaped leaf sheet, is configured to be included in the above medium portion, Aerosol generating product.

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