Filter for aerosol-generating article and aerosol-generating article comprising the same

Abstract

The present application relates to a filter for an aerosol generating article capable of effectively removing specific substances included in mainstream smoke while maintaining excellent smoking quality, and an aerosol generating article including the same.

Description

Technical Field

[0001] The present invention relates to a filter for aerosol generating articles and an aerosol generating article including the same, the filter for aerosol generating articles being able to effectively remove specific substances included in mainstream smoke while maintaining excellent smokeability. Background Technology

[0003] Typically, to manufacture cigarettes, various types of tobacco leaves are blended and processed to provide the desired flavor and taste. Next, the processed tobacco leaves are cut to produce shredded tobacco, which can then be wrapped in cigarette paper to produce cigarettes. During cigarette manufacturing, a filter can be attached to the cigarette to meet needs such as improving the taste of the smoke.

[0004] As a filter part for cigarettes, a filter part formed of fiber aggregates, an adsorption filter part containing adsorption materials such as activated carbon or zeolite, etc., can be used, and a cigarette filter part including a bundle of filaments can be manufactured.

[0005] On the other hand, the problem lies in the fact that substances with low molecular weight, ionic properties, and high volatility found in mainstream cigarette smoke are difficult to remove using conventional adsorbents. Therefore, there is a need to develop technologies for the effective removal of these specific substances.

[0007] [Existing Technical Documents]

[0008] [Patent Literature]

[0009] (Patent Document 1) Korean Patent Application Publication No. 10-2023-0056843 (published on April 28, 2023) Summary of the Invention

[0010] Technical issues

[0011] The object of the present invention is to provide a filter section for aerosol generating articles and an aerosol generating article including the same, wherein the filter section for aerosol generating articles utilizes a filter section comprising an alkaline calcium phosphate-based compound, thereby enabling the effective removal of specific substances included in mainstream smoke while achieving smoking performance.

[0012] However, the problems to be solved by the present invention are not limited to those described above, and those skilled in the art will clearly understand from the following description other problems not mentioned.

[0013] Technical solution

[0014] One embodiment of the present invention provides a filter section for aerosol generating articles, the filter section for aerosol generating articles comprising: a first filter section containing a first filter material; and a second filter section containing a second filter material, wherein the second filter material comprises an alkaline calcium phosphate-based compound.

[0015] Another embodiment of the present invention provides an aerosol generating article, the aerosol generating article comprising: a medium section; and a filter section, wherein the filter section includes a filter section for the aerosol generating article.

[0016] Beneficial effects

[0017] According to one embodiment of the present invention, a filter unit for aerosol-generating articles can effectively remove specific substances included in mainstream smoke while achieving smokeability.

[0018] Furthermore, an aerosol-generating article according to one embodiment of the present invention can effectively remove specific substances included in mainstream smoke while providing smokers with excellent smoking performance.

[0019] The effects of the present invention are not limited to those described above, and those skilled in the art can clearly understand from this specification and the accompanying drawings the effects not mentioned. Attached Figure Description

[0021] Figure 1 An aerosol-generating article according to one embodiment of the present invention is shown.

[0022] Figure 2a and Figure 2b A cross-section of an aerosol-generating article according to an embodiment of the present invention is shown. Detailed Implementation

[0024] In this specification, unless the context clearly indicates otherwise, the singular form includes the plural form.

[0025] In this specification, the terms “comprising” and / or “including” specify the presence of the mentioned shapes, steps, quantities, operations, components, elements and / or groups thereof, and do not exclude the presence or addition of one or more other shapes, steps, quantities, operations, components, elements and / or groups thereof.

[0026] In this specification, "at least one of a, b and c" may include a, b or c alone, or may include a combination of two or more selected from the group consisting of a, b and c.

[0027] In this specification, the terms "a and / or b" are used to mean "a or b" and "a and b".

[0028] In this specification, the term "connection" is a concept that means not only a direct structural connection between certain components, but also an indirect connection where another component is further inserted between them. Additionally, "connection" in this specification can also include not only structural aspects but also electrical connections between specific components and other components. For example, a connection between a first component and a second component could mean that they are structurally directly or indirectly connected, or electrically connected.

[0029] When multiple embodiments are described in this specification, each embodiment may be combined unless there is a specific description to the contrary. Here, the effects of this disclosure can be defined as including not only the effects derive from each embodiment on its own, but also the effects that occur when the various embodiments are organically combined. For example, unless the context clearly indicates otherwise, even when embodiments 1 and 2 are described independently in this specification, embodiments 1 and 2 may be organically combined with each other, and the effects of this disclosure may include the effects that occur when embodiments 1 and 2 are combined.

[0030] In this specification, the term "to" is used to indicate a range of values ​​that include the lower and upper limits of the values ​​described before and after the term, respectively. When the values ​​serving as the upper and lower limits of any range of values ​​are each disclosed as multiple numbers, the range of values ​​disclosed in this specification can be understood as any range of values ​​having any one of the multiple lower limits and any one of the multiple upper limits as the lower and upper limits, respectively. For example, when a to b or c to d is described in this specification, it is understood that greater than or equal to a and less than or equal to b, greater than or equal to a and less than or equal to d, greater than or equal to c and less than or equal to d, or greater than or equal to c and less than or equal to b are described.

[0031] In this specification, terms such as “about” or “substantially” refer to a reasonable amount of deviation of the modified term such that the final result is not significantly altered. Such terms can be interpreted as including a deviation of at least ±5% or at least ±10% within the limits that the deviation does not change the meaning of the term and does not invalidate the meaning of the term.

[0032] In this specification, "layer" or "film" can include not only cases where the layer or film is formed over the entire region when the region where the layer or film is observed, but also cases where the layer or film is formed only in a portion of the region when the region where the layer or film is observed. For example, a "layer" or "film" can be defined as including forms in which the surface of the layer or film is flat, forms in which the surface of the layer or film is uneven, and combinations thereof; or forms in which the surface of the layer or film is continuous, forms in which the surface of the layer or film is discontinuous, and combinations thereof. For example, when another component is formed directly on a component as a layer or film, the coverage of the other component relative to the surface of the component can be defined as 1% or greater, 5% or greater, 10% or greater, 20% or greater, 30% or greater, 40% or greater, 50% or greater, 60% or greater, 70% or greater, 80% or greater, 85% or greater, 90% or greater, 95% or greater, or 99% or greater. For example, even when multiple particles form a cluster structure, it can be defined as a "layer" or "film".

[0033] In this specification, when another component is placed directly on a component, it can be defined as when there are no other components between one component and the other component.

[0034] In this specification, "aerosol-generating article" can mean any smokeable product or any product that provides a smoking experience, regardless of whether it is based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. For example, aerosol-generating articles can include smokeable articles such as cigarettes, cigars, and cigarettes. As another example, aerosol-generating articles can be combustible smoking articles or heated smoking articles, and specifically heated smoking articles.

[0035] In this specification, "upstream" or "upstream direction" can refer to a direction away from the smoker's mouth, and "downstream" or "downstream direction" can refer to a direction closer to the smoker's mouth. The terms upstream and downstream can be used to describe the relative positions of elements forming an aerosol-generating article.

[0036] In this specification, "longitudinal direction" may refer to the direction corresponding to the longitudinal axis of the aerosol-generating article.

[0038] The structure of this disclosure will be described in more detail below with reference to the accompanying drawings.

[0039] One embodiment of the present invention provides a filter section for aerosol-generating articles, the filter section for aerosol-generating articles comprising: a first filter section containing a first filter material; and a second filter section containing a second filter material, wherein the second filter material comprises an alkaline calcium phosphate-based compound.

[0040] According to one embodiment of the present invention, a filter for aerosol-generating articles can effectively remove specific substances included in mainstream smoke while achieving smoking performance. Specifically, the specific substances may be components having low molecular weight, ionic properties, and high volatility. For example, the specific substances may be formaldehyde (HCHO).

[0041] According to one embodiment of the present invention, the filter section for the aerosol generating article includes a second filter section containing the second filter material, thereby enabling the effective removal of specific substances included in mainstream smoke during smoking. Specifically, the second filter material may include an alkaline calcium phosphate-based compound. The alkaline calcium phosphate-based compound may contain hydroxyl groups. By using the alkaline calcium phosphate-based compound, specific substances included in mainstream smoke can be effectively removed.

[0042] According to one embodiment of the present invention, the basic calcium phosphate-based compound may include hydroxyapatite (Ca5(PO4)3(OH)), calcium hydrogen phosphate (CaHPO4), tricalcium phosphate (Ca3(PO4)2), and type A hydroxyapatite (Ca... 10 (PO4)6(CO3) y (OH) 2-2y Among them, 0≤y≤1), type B hydroxyapatite (Ca 10-x (PO4) 6-x (CO3) x (OH) 2-x The basic calcium phosphate compound contains at least one of the following: 0 ≤ x ≤ 2, octacalcium phosphate (Ca8H2(PO4)6·5H2O), and tetracalcium phosphate (Ca4(PO4)2O). Specifically, the basic calcium phosphate compound may include at least hydroxyapatite. By using the above-mentioned basic calcium phosphate compounds, specific substances included in mainstream smoke can be effectively removed.

[0043] According to one embodiment of the present invention, the first filter material may include at least one selected from activated carbon, activated carbon fiber, zeolite, silica gel, alumina, ion exchange resin, activated clay, bentonite, diatomaceous earth, metakaolin, carbon adsorbent, and porous silicate. Specifically, the carbon adsorbent may include graphene, and the first filter material may include at least activated carbon. The first filter material itself can exhibit a filtering effect on mainstream smoke. By using the above-described types of first filter materials, specific substances included in mainstream smoke can be effectively removed.

[0044] According to one embodiment of the present invention, the size (average diameter) of the first filter material can be 0.01 mm or more and 2 mm or less. Specifically, the size of the first filter material can be 0.02 mm or more and 1.8 mm or less, 0.03 mm or more and 1.6 mm or less, 0.04 mm or more and 1.5 mm or less, 0.01 mm or more and 1.8 mm or less, 0.02 mm or more and 1.6 mm or less, 0.03 mm or more and 1.5 mm or less, 0.04 mm or more and 2 mm or less, 0.02 mm or more and 1.9 mm or less, 0.03 mm or more and 1.8 mm or less, or 0.04 mm or more and 1.7 mm or less. In this case, the size (average diameter) of the activated carbon as the first filter material can be 0.01 mm or more and 2 mm or less. When the size of the first filter material is within the above range, the first filter material can exhibit a filtering effect due to its own physical properties.

[0045] According to one embodiment of the present invention, the size of the second filter material can be 0.01 mm or more and 2 mm or less. Specifically, the size of the second filter material can be 0.02 mm or more and 1.8 mm or less, 0.03 mm or more and 1.6 mm or less, 0.04 mm or more and 1.5 mm or less, 0.01 mm or more and 1.8 mm or less, 0.02 mm or more and 1.6 mm or less, 0.03 mm or more and 1.5 mm or less, 0.04 mm or more and 2 mm or less, 0.02 mm or more and 1.9 mm or less, 0.03 mm or more and 1.8 mm or less, or 0.04 mm or more and 1.7 mm or less. In this case, the size (average diameter) of the hydroxyapatite as the second filter material can be 0.01 mm or more and 2 mm or less. When the size of the second filter material is within the above range, specific substances included in mainstream smoke can be effectively removed.

[0046] According to one embodiment of the present invention, the size ratio of the first filter material to the second filter material can be from 1:0.01 to 1:10. Specifically, the size ratio of the first filter material to the second filter material can be 1:0.02 to 1:9, 1:0.05 to 1:8, 1:0.08 to 1:7, 1:0.1 to 1:6, 1:0.01 to 1:9, 1:0.02 to 1:8, 1:0.05 to 1:7, 1:0.08 to 1:6, 1:0.1 to 1:10, 1:0.01 to 1:6, 1:0.02 to 1:10, 1:0.05 to 1:9, 1:0.08 to 1:8, or 1:0.1 to 1:7. When the size ratio of the first filter material to the second filter material is within the above ranges, specific substances included in the mainstream smoke can be effectively removed while preventing a reduction in the flow of mainstream smoke.

[0047] According to one embodiment of the present invention, the content of the first filter material per unit length of the first filter section can be 0.5 mg / mm or more and 10 mg / mm or less. Specifically, the content of the first filter material per unit length of the first filter section can be 1 mg / mm or more and 9 mg / mm or less, 1.5 mg / mm or more and 8 mg / mm or less, 2 mg / mm or more and 7 mg / mm or less, 0.5 mg / mm or more and 6 mg / mm or less, 1 mg / mm or more and 5 mg / mm or less, 1.5 mg / mm or more and 10 mg / mm or less, 2 mg / mm or more and 8 mg / mm or less, 0.5 mg / mm or more and 5 mg / mm or less, 1 mg / mm or more and 10 mg / mm or less, 1.5 mg / mm or more and 9 mg / mm or less, or 2 mg / mm or more and 8 mg / mm or less. When the content of the first filter material per unit length of the first filter section is within the above range, a filter section that can effectively remove specific substances included in mainstream smoke while achieving excellent smoking performance can be easily obtained.

[0048] According to one embodiment of the present invention, the content of the first filter substance included in the first filter section can be 1.5 mg or more and 180 mg or less. Specifically, the content of the first filter substance in the first filter section can be 2 mg or more and 150 mg or less, 3 mg or more and 100 mg or less, 4 mg or more and 70 mg or less, 5 mg or more and 50 mg or less, 2 mg or more and 120 mg or less, 3 mg or more and 80 mg or less, 4 mg or more and 50 mg or less, 5 mg or more and 150 mg or less, 2 mg or more and 100 mg or less, 3 mg or more and 70 mg or less, 4 mg or more and 60 mg or less, 5 mg or more and 100 mg or less, 2 mg or more and 60 mg or less, or 4 mg or more and 120 mg or less. When the content of the first filter substance included in the first filter section is within the above range, a filter section that can effectively remove specific substances included in mainstream smoke while achieving excellent smoking performance can be easily obtained. In this case, the content of the first filter material included in the first filter section can be the same as the content of the first filter material included in the filter section for aerosol generation articles.

[0049] According to one embodiment of the present invention, the content of the second filter material per unit length of the second filter section can be 1 mg / mm or more and 20 mg / mm or less. Specifically, the content of the first filter material per unit length of the first filter section can be 1.5 mg / mm or more and 19 mg / mm or less, 2 mg / mm or more and 18 mg / mm or less, 2.5 mg / mm or more and 17 mg / mm or less, 3 mg / mm or more and 15 mg / mm or less, 1 mg / mm or more and 18 mg / mm or less, 1.5 mg / mm or more and 17 mg / mm or less, 2 mg / mm or more and 16 mg / mm or less, 2.5 mg / mm or more and 15 mg / mm or less, 3 mg / mm or more and 20 mg / mm or less, 1 mg / mm or more and 16 mg / mm or less, or 2 mg / mm or more and 15 mg / mm or less. When the content of the second filter material per unit length of the second filter section is within the above range, the surface area of ​​the second filter material capable of oxidizing specific substances included in mainstream smoke can be effectively ensured. Therefore, it is easy to obtain a filter section that can effectively remove specific substances included in mainstream smoke while achieving excellent smoking performance.

[0050] According to one embodiment of the present invention, the content of the second filter material included in the second filter section can be 3 mg or more and 300 mg or less. Specifically, the content of the second filter material included in the second filter section can be 5 mg or more and 250 mg or less, 10 mg or more and 200 mg or less, 15 mg or more and 150 mg or less, 3 mg or more and 250 mg or less, 5 mg or more and 200 mg or less, 10 mg or more and 150 mg or less, 15 mg or more and 300 mg or less, 3 mg or more and 150 mg or less, 5 mg or more and 300 mg or less, 10 mg or more and 250 mg or less, 15 mg or more and 200 mg or less, 5 mg or more and 150 mg or less, or 10 mg or more and 300 mg or less. When the content of the second filter material included in the second filter section is within the above range, a filter section that can effectively remove specific substances included in mainstream smoke while achieving excellent smoking performance can be easily obtained. In this case, the content of the second filter material included in the second filter section can be the same as the content of the second filter material included in the filter section for aerosol generation articles.

[0051] According to one embodiment of the present invention, the weight ratio of the first filter material to the second filter material can be from 1:0.1 to 1:20. Specifically, the weight ratio of the first filter material to the second filter material can be 1:0.2 to 1:18, 1:0.4 to 1:16, 1:0.5 to 1:15, 1:0.1 to 1:18, 1:0.2 to 1:16, 1:0.4 to 1:15, 1:0.5 to 1:20, 1:0.1 to 1:15, 1:0.2 to 1:20, 1:0.4 to 1:18, or 1:0.5 to 1:16. When the weight ratio of the first filter material to the second filter material is within the above range, it is possible to effectively remove specific substances included in mainstream smoke while achieving excellent smokeability.

[0052] According to one embodiment of the present invention, the volume ratio of the first filter section to the second filter section can be from 1:0.1 to 1:10. Specifically, the volume ratio of the first filter section to the second filter section can be from 1:0.1 to 1:8, 1:0.1 to 1:6, 1:0.2 to 1:10, 1:0.2 to 1:8, or 1:0.2 to 1:6. When the volume ratio of the first filter section to the second filter section is within the above range, the flow of cigarette smoke and the reduction of the smokeability of the cigarette can be prevented, thereby effectively bringing specific substances into contact with the second filter material. Therefore, it is possible to effectively remove specific substances included in mainstream smoke while achieving excellent smokeability. In this case, when the diameters of the first filter section and the second filter section are the same, the length ratio of the first filter section to the second filter section can be from 1:0.1 to 1:10.

[0053] According to one embodiment of the present invention, the diameter of the first filter portion can be 5 mm or more and 10 mm or less, 5 mm or more and 9 mm or less, or 5 mm or more and 8 mm or less. When the diameter of the first filter portion is within the above range, specific substances included in the mainstream smoke can be effectively filtered out during smoking. Furthermore, the length of the first filter portion can be 1 mm or more and 30 mm or less, 2 mm or more and 25 mm or less, 3 mm or more and 20 mm or less, 1 mm or more and 9 mm or less, or 9 mm or more and 30 mm or less. When the length of the first filter portion is within the above range, specific substances included in the mainstream smoke can be effectively removed during smoking.

[0054] According to one embodiment of the present invention, the diameter of the second filter section can be 5 mm or more and 10 mm or less, 5 mm or more and 9 mm or less, or 5 mm or more and 8 mm or less. When the diameter of the second filter section is within the above range, specific substances included in the mainstream smoke can be effectively filtered out during smoking. Furthermore, the length of the second filter section can be 1 mm or more and 30 mm or less, 2 mm or more and 25 mm or less, 3 mm or more and 20 mm or less, 1 mm or more and 9 mm or less, or 9 mm or more and 30 mm or less. When the length of the second filter section is within the above range, specific substances included in the mainstream smoke can be effectively removed during smoking.

[0055] According to one embodiment of the present invention, the filter section for aerosol generating articles includes a first filter section and a second filter section, and can be formed using a variety of materials. Here, materials used in the art can be used without limitation as materials for preparing the filter section for aerosol generating articles. For example, the filter section for aerosol generating articles can be a cellulose acetate filter section, a cellulose tow filter section, a paper filter section, or a polypropylene (PP) tow filter section.

[0057] Figure 1 An aerosol-generating article according to one embodiment of the present invention is shown.

[0058] One embodiment of the present invention provides an aerosol generating article, the aerosol generating article comprising: a medium section; and a filtering unit, wherein the filtering unit includes a filtering section for the aerosol generating article.

[0059] According to one embodiment of the invention, the aerosol-generating article can effectively remove specific substances included in mainstream smoke while providing smokers with excellent smoking performance.

[0060] Reference Figure 1 The aerosol generating article 100 may include: a filter unit 110, a roll of paper 110a wrapped with a filter section; a medium section 120, a roll of paper 120a wrapped with a medium section; and a splicing paper 130.

[0061] According to one embodiment of the present invention, the medium portion may include a smoking material. For example, the smoking material may include tobacco material. The tobacco material may include shredded tobacco leaves, tobacco stems, materials processed therefrom, etc. As a more specific example, the tobacco material may include crushed tobacco leaves, crushed reconstituted tobacco, expanded tobacco shreds, expanded tobacco stems, reconstituted tobacco sheets, etc. However, the tobacco material is not limited to these. Furthermore, the tobacco material may be in the form of shredded tobacco, tobacco microparticles, tobacco sheets, tobacco beads, tobacco granules, or tobacco extracts; however, the form is not limited to these.

[0062] According to one embodiment of the invention, the medium portion may contain other additive materials, such as flavoring agents, wetting agents, and / or acetate compounds. For example, flavoring agents may include licorice, sucrose, fructose syrup, isosweet, cocoa, lavender, Ceylon cinnamon, cardamom, celery, fenugreek, quinoa, sandalwood, bergamot, geranium, honey extract, rose oil, vanilla, lemon oil, orange oil, peppermint oil, cinnamon, caraway, cognac, jasmine, chamomile, menthol, cinnamon, ylang-ylang, sage, spearmint, ginger, coriander, coffee, etc. Furthermore, wetting agents may include glycerin, propylene glycol, etc. Additionally, the medium portion may also include vitamin components. For example, the vitamin components may include at least one of vitamin A, vitamin B, vitamin C, and vitamin E, but are not limited thereto.

[0063] According to one embodiment of the present invention, the filter unit, in addition to including the filter section for the aerosol-generating article, can be constructed without limitation using filter units commonly used in the art. The filter unit may be located downstream of the medium section, allowing aerosol substances generated in the medium section to pass through just before the user inhales them. The filter unit can be formed using various materials; for example, the filter unit may be a cellulose acetate filter section.

[0064] According to one embodiment of the invention, the filter unit may be a cellulose acetate filter section containing untreated flavoring substances. However, the filter unit is not limited to this and may also be a TJNS (transfer jet nozzle system) filter section containing treated flavoring substances. The filter unit may also be a tubular structure including a hollow section inside. Alternatively, the filter unit may be prepared by inserting a structure made of the same or different materials, such as a membrane or a tube, into the interior (e.g., the hollow section).

[0065] According to one embodiment of the present invention, the stiffness of the filter unit can be adjusted by regulating the content of the plasticizer during the preparation of the filter unit. Triacetin can be used as the plasticizer; however, the type and content of the plasticizer are not limited to this and can be appropriately adjusted as needed.

[0066] According to one embodiment of the invention, the filter unit is shown as a single filter unit consisting of a single filter section, but is not limited thereto. For example, the filter unit can of course be configured as a dual filter unit, a triple filter unit, etc., including two filter sections, in order to improve filtration efficiency.

[0067] According to one embodiment of the present invention, the filtration unit may include the filtration section for the aerosol generating article and an additional filtration section.

[0068] According to one embodiment of the present invention, the first filter section and the second filter section may be arranged sequentially based on the direction from the medium section toward the filter unit.

[0069] Figure 2a and Figure 2b A cross-section of an aerosol-generating article according to an embodiment of the present invention is shown. Specifically, Figure 2a A cross-section of an aerosol-generating article including a dual-filtration section with two filtration units is shown. Figure 2b A cross-section of an aerosol-generating article including a triple filtration section with three filtration sections is shown.

[0070] Reference Figure 2a The filtration unit 110 may include a first filtration section 111 and a second filtration section 112. Here, the first filtration section 111 located upstream may contain the first filter material, and the second filtration section 112 located downstream may contain the second filter material. By providing the filtration section for the aerosol generating article in the filtration unit 110, the aerosol generating article 100 can provide smokers with excellent smoking performance and can effectively remove formaldehyde included in mainstream smoke.

[0071] According to one embodiment of the present invention, a filter unit including a first filter section located on the upstream side and a second filter section located on the downstream side can have a better efficiency in removing formaldehyde included in mainstream smoke than a filter unit including a second filter section located on the upstream side and a first filter section located on the downstream side.

[0072] Reference Figure 2b The filtration unit 110 may include a first filtration section 111, a second filtration section 112, and a third filtration section 113. Since the first filtration section 111 and the second filtration section 112 are located upstream of the third filtration section 113, the aerosol generating article 100 can provide excellent smoking performance to smokers and effectively remove formaldehyde included in mainstream smoke.

[0073] According to one embodiment of the present invention, the third filter section may not contain a filter material. Specifically, the third filter section may not contain at least one of the first filter material and the second filter material. That is, the third filter section may be a filter section without a filter material.

[0074] According to one embodiment of the present invention, the diameter of the third filter section can be 5 mm or more and 10 mm or less, 5 mm or more and 9 mm or less, or 5 mm or more and 8 mm or less. When the diameter of the third filter section is within the above range, specific substances included in the mainstream smoke can be effectively removed during smoking. Furthermore, the length of the third filter section can be 2 mm or more and 20 mm or less, 5 mm or more and 15 mm or less, 7 mm or more and 9 mm or less, or 7 mm or more and 12 mm or less. When the length of the third filter section is within the above range, specific substances included in the mainstream smoke can be effectively removed during smoking.

[0075] According to one embodiment of the invention, a capsule (not shown) may be included inside the filtration unit. The capsule may have a structure in which an inner solution including a fragrance is encapsulated by a coating, and for example, the capsule may have a spherical or cylindrical shape. The material forming the capsule coating may include natural materials, starch, and / or a gelling agent. For example, a coating made of natural materials may be formed using agar, pectin, sodium alginate, glycerin, etc. As a gelling agent, gellan gum or gelatin may be used. Furthermore, an auxiliary gelling agent may be used as the material forming the capsule coating. For example, calcium chloride may be used as an auxiliary gelling agent. Additionally, a plasticizer may be used as the material forming the capsule coating. Here, glycerin and / or sorbitol may be used as plasticizers. Furthermore, a coloring material may be used as the material forming the capsule coating.

[0076] For example, medium-chain fatty acid triglycerides (MCTG) can be used as a solvent for flavorings included in the inner solution of the capsule. Furthermore, the inner solution may contain other additives such as pigments, emulsifiers, and thickeners. The inner solution of the capsule may include, but is not limited to, flavorings such as menthol and plant essential oils.

[0077] According to one embodiment of this disclosure, the filter unit is located downstream of the medium section and serves as a filter that allows aerosol substances generated in the medium section to pass through before being inhaled by the user. The filter unit can be wrapped with filter paper.

[0078] Alternatively, the media section can be wrapped with media roll paper. In the media roll paper, combustion promoters such as glycerin, potassium citrate (K-citrate) and / or sodium citrate (NA-citrate) used to promote the complete combustion of the smoking material through catalysis can be added. Additionally, fillers such as calcium carbonate, titanium dioxide, and magnesium oxide may also be included.

[0079] According to one embodiment of the present invention, the media roll may also have a double-roll structure. Specifically, the media roll may include an inner wrapper that contacts and wraps around the media and an outer wrapper that contacts and wraps around the inner wrapper.

[0080] Furthermore, the media roll paper can be a low-ignition-probability cigarette paper having at least one low-ignition-propensity (LIP) strip (not shown) formed thereon. The LIP strip reduces the porosity of the media roll paper, thus reducing the amount of oxygen flowing into the media when the tobacco combustion reaches the LIP strip, thereby extinguishing aerosol-generating articles during combustion. Here, the LIP strip can be a coating formed on the inner surface of the media roll paper. The filter unit wrapped with the filter roll paper and the media section wrapped with the media roll paper can be jointly wrapped by a tipping paper. That is, the tipping paper can wrap at least a portion of the media roll paper (e.g., a downstream portion) and the outer periphery of the filter roll paper. On the other hand, the tipping paper can contain a non-combustible material to prevent the filter unit from also burning along with the media section.

[0081] According to one embodiment of the present invention, the tar delivery of the aerosol-generating article may be 7 mg / cig or less. Specifically, the tar delivery of the aerosol-generating article may be 4.5 mg / cig or more and 7 mg / cig or less, 5 mg / cig or more and 6.5 mg / cig or less, or 4.5 mg / cig or more and 6.5 mg / cig or less.

[0082] According to one embodiment of the present invention, the nicotine release level of the aerosol-generating article may be 0.1 mg / cig or more. Specifically, the nicotine release level of the aerosol-generating article may be 0.1 mg / cig or more and 1 mg / cig or less, 0.1 mg / cig or more and 0.5 mg / cig or less, or 0.5 mg / cig or more and 1 mg / cig or less.

[0083] According to one embodiment of the present invention, the nicotine release amount of the aerosol-generating article can be 5% or more and 20% or less of the tar release amount. Specifically, the nicotine release amount of the aerosol-generating article can be 7% or more and 15% or less, 9% or more and 12% or less, 5% or more and 10% or less, or 9% or more and 20% or less of the tar release amount. By controlling the nicotine release amount of the aerosol-generating article relative to the tar release amount within the above-mentioned numerical range, it is possible to improve the removal rate of specific substances while achieving excellent smoking performance.

[0084] According to one embodiment of the present invention, the removal rate of a specific substance from the aerosol-generating article can be 5% or more and 100% or less. Specifically, the removal rate of a specific substance from the aerosol-generating article can be 7% or more and 90% or less, 10% or more and 80% or less, 20% or more and 70% or less, 30% or more and 65% or less, 15% or more and 60% or less, or 10% or more and 70% or less. By controlling the removal rate of a specific substance from the aerosol-generating article within the above-mentioned numerical range, the specific substance can be effectively removed.

[0086] The present invention will be described in detail below by way of embodiments. However, embodiments of the present invention can be modified in various different forms, and the scope of the invention should not be construed as limited to the embodiments described below. Embodiments are provided in this specification to explain the invention more fully to those skilled in the art.

[0088] Example

[0089] Material

[0090] Prepare activated carbon as the first filter material and hydroxyapatite as the second filter material.

[0092] Example 1

[0093] Preparation of the filter section

[0094] The preparation process sequentially includes a first cellulose acetate filter section containing activated carbon with an average diameter of 0.266 mm, a second cellulose acetate filter section containing hydroxyapatite with an average diameter of 0.266 mm, and a third cellulose acetate filter section. Here, the diameters of the first, second, and third filter sections are all 7.8 mm, and the lengths of the first, second, and third filter sections are all 9 mm. The activated carbon content in the first filter section is 18 mg, and the activated carbon content per unit length of the first filter section is 2 mg / mm. Furthermore, the hydroxyapatite content in the second filter section is 54 mg, and the hydroxyapatite content per unit length of the second filter section is 6 mg / mm. No adsorbent is added to the third filter section, and the filter section is made solely of cellulose acetate material.

[0096] Aerosol-generating items

[0097] Manufactured such as Figure 1The aerosol generating article shown includes a medium section and a filter unit comprising the filter section. Here, the filter section sequentially includes a first filter section, a second filter section, and a third filter section in the direction from the medium section to the filter unit. Furthermore, the diameter of the smoking article is 7.8 mm, the length of the medium section is 57 mm, and the total length of the filter unit is 27 mm.

[0099] Examples 2 to 21

[0100] Except for adjusting the diameters of the first and second filter materials, the contents of the first and second filter materials, and the lengths of the first and second filter sections as shown in Table 1 below, the filter section and the aerosol generating article were manufactured in the same manner as in Example 1.

[0101] [Table 1]

[0103] In Table 1, the content of the first filter material is based on the length of the first filter section, and the content of the second filter material is based on the length of the second filter section.

[0105] Comparative Example 1

[0106] As shown in Table 2 below, except that the second filter section is not used and the length of the first filter section is adjusted, the filter section and the aerosol generating article are manufactured by the same method as in Embodiment 1.

[0108] Comparative Example 2

[0109] As shown in Table 2 below, except that 18 mg of the first filter material is added to the second filter section and 54 mg of the second filter material is added to the first filter section, the filter section and the aerosol generating article are manufactured by the same method as in Example 1.

[0111] Comparative Example 3

[0112] As shown in Table 2 below, the filter section and aerosol generating article are manufactured in the same way as in Example 1, except that the first filter material is not added to the first filter section.

[0114] Comparative Example 4

[0115] As shown in Table 2 below, except that the first filter section is not used and the length of the second filter section is adjusted, the filter section and the aerosol generating article are manufactured by the same method as in Embodiment 1.

[0117] [Table 2]

[0119] In Table 2, the content of the first filter material in Comparative Example 1 is based on the length of the first filter section, and the content of the second filter material in each of Comparative Examples 3 and 4 is based on the length of the second filter section. Additionally, in Table 2, the content of the first filter material in Comparative Example 2 is based on the length of the second filter section, and the content of the second filter material is based on the length of the first filter section.

[0121] Analysis of smoke emission based on the dimensions of the first and second filter materials

[0122] The smoke components of the aerosol-generating articles manufactured in Examples 1 to 9 and Comparative Example 1 were measured using gas chromatography (GC), and the results are shown in Table 3 below.

[0124] [Table 3]

[0126] In Table 3, the HCHO removal rate was calculated by comparing the HCHO content measured in Examples 1 to 9 with the HCHO content measured in Comparative Example 1.

[0127] Referring to Table 3, it was confirmed that the aerosol-generating articles including the filter sections of Examples 1 to 9 of the present invention effectively remove HCHO included in mainstream smoke while providing excellent smokeability.

[0128] On the other hand, it was confirmed that the filter section of Comparative Example 1 had a very poor ability to remove HCHO, which is present in mainstream smoke.

[0130] Analysis of smoke emission based on the increased content of the first and second filter materials

[0131] The smoke components of the aerosol-generating articles manufactured in Examples 1 and 10 to 13 and Comparative Examples 1 and 2 were measured using gas chromatography (GC), and the results are shown in Table 4 below.

[0133] [Table 4]

[0134] In Table 4, the HCHO removal rate was calculated by comparing the HCHO content measured in Comparative Example 2 and Examples 1 to 13 with the HCHO content measured in Comparative Example 1.

[0135] Referring to Table 4, it was confirmed that the aerosol-generating articles including the filter sections of Examples 1 and 10 to 13 of the present invention effectively remove HCHO included in mainstream smoke while providing excellent smoking performance.

[0136] On the other hand, it was confirmed that the filter section of Comparative Example 1, since it did not include a second filter material, had a very poor ability to remove HCHO included in mainstream smoke. It was also confirmed that the filter section of Comparative Example 2, since it included both a first filter material in the second filter section and a second filter material in the first filter section, had a poor ability to remove HCHO included in mainstream smoke.

[0138] [Table 5]

[0140] In Table 5, the HCHO removal rate was calculated by comparing the HCHO content measured in Examples 1 and 14 to 17 with the HCHO content measured in Comparative Example 3.

[0141] Referring to Table 5, it was confirmed that the aerosol-generating articles including the filter sections of Examples 1 and 14 to 17 of the present invention effectively remove HCHO included in mainstream smoke while providing excellent smoking performance.

[0142] On the other hand, it was confirmed that the filter section of Comparative Example 3 had a very poor ability to remove HCHO, including from mainstream smoke.

[0144] Based on the volumes of the first filter section containing the first filter material and the second filter section containing the second filter material Analysis of smoke emission

[0145] The smoke components of the aerosol-generating articles manufactured in Examples 1 and 10 to 13 and Comparative Examples 1 and 2 were measured using gas chromatography (GC), and the results are shown in Table 6 below.

[0147] [Table 6]

[0149] In Table 6, the HCHO removal rate was calculated by comparing the HCHO content measured in Comparative Examples 4, 1, and 18 to 21 with the HCHO content measured in Comparative Example 1.

[0150] Referring to Table 6, it was confirmed that the aerosol-generating articles including the filter sections of Examples 1 and 18 to 21 of the present invention effectively remove HCHO included in mainstream smoke while providing excellent smoking performance.

[0151] On the other hand, it was confirmed that the filters of Comparative Examples 1 and 4 had a very poor ability to remove HCHO, including from mainstream smoke.

[0153] [Explanation of reference numerals in the attached figures]

[0154] 100: Aerosol generating items 110: Filter unit

[0155] 110a: Filter section paper roll

[0156] 111: First filtration section; 112: Second filtration section

[0157] 113: Third Filtration Section

[0158] 120: Medium section

[0159] 120a: Media roll paper; 130: Tipping paper

Claims

1. A filter unit for aerosol-generating articles, comprising: The first filtration section contains a first filtration substance; as well as The second filtration section contains a second filtration substance. The second filter material contains an alkaline calcium phosphate-based compound.

2. The filter unit for aerosol-generating articles according to claim 1, wherein, The alkaline calcium phosphate-based compound includes at least one of hydroxyapatite, calcium hydrogen phosphate, tricalcium phosphate, hydroxyapatite carbonate, octacalcium phosphate, and tetracalcium phosphate.

3. The filter unit for aerosol-generating articles according to claim 1, wherein, The first filter material includes at least one of activated carbon, activated carbon fiber, zeolite, silica gel, alumina, ion exchange resin, activated clay, bentonite, diatomaceous earth, metakaolin, carbon adsorbent, and porous silicate.

4. The filter unit for aerosol-generating articles according to claim 1, wherein, The size of the first filter material is greater than 0.01 mm and less than 2 mm.

5. The filter unit for aerosol-generating articles according to claim 1, wherein, The size of the second filter material is greater than 0.01 mm and less than 2 mm.

6. The filter unit for aerosol-generating articles according to claim 1, wherein, The size ratio of the first filter material to the second filter material is from 1:0.01 to 1:

10.

7. The filter unit for aerosol-generating articles according to claim 1, wherein, The weight ratio of the first filter material to the second filter material is 1:0.1 to 1:

20.

8. The filter unit for aerosol-generating articles according to claim 1, wherein, The content of the first filter material per unit length of the first filter section is 0.5 mg / mm or more and 10 mg / mm or less.

9. The filter unit for aerosol-generating articles according to claim 1, wherein, The content of the second filter material per unit length of the second filter section is more than 1 mg / mm and less than 20 mg / mm.

10. The filter unit for aerosol-generating articles according to claim 1, wherein, The volume ratio of the first filter section to the second filter section is 1:0.1 to 1:

10.

11. An aerosol-generating article, comprising: Medium section; as well as Filter unit, The filtration unit includes a filtration section for aerosol-generating articles according to claim 1.

12. The aerosol-generating article according to claim 11, wherein, The first filter section and the second filter section are arranged sequentially along the direction from the medium section to the filter section.

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