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

Abstract

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

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a filter for an aerosol generating article capable of effectively removing specific substances included in mainstream smoke while achieving excellent smoking satisfaction, and an aerosol generating article including the same. BACKGROUND

[0003] In general, in order to manufacture tobacco, various types of tobacco leaves are mixed and processed in order to produce desired aroma and taste. Then, the processed tobacco leaves are cut to prepare cut tobacco leaves, and the cut tobacco leaves can be wrapped with a cigarette paper to manufacture a cigarette. The cigarette can be manufactured to be attached with a filter according to necessity, such as for the purpose of improving smoke taste.

[0004] As a filter used in tobacco, a filter in which fibers are gathered and an adsorption filter to which an adsorbent such as activated carbon or zeolite is added can be used, and the tobacco filter can be manufactured to include a tow (a bundle of fiber filaments).

[0005] On the other hand, among components included in mainstream smoke, there is a problem that a substance having low molecular weight, ionicity, and strong volatility is difficult to remove using an existing adsorbent. Therefore, there is a need to develop a technology for effectively removing such a specific substance or the like.

[0006] [Prior Art Document]

[0007] [Patent Document]

[0008] (Patent Document 1) Korean Patent Application Publication No. 10-2023-0056843 (published on April 28, 2023) SUMMARY

[0009] TECHNICAL PROBLEM

[0010] The present disclosure aims to provide a filter for an aerosol generating article capable of effectively removing specific substances included in mainstream smoke while achieving excellent smoking satisfaction by including a basic calcium phosphate-based compound, and an aerosol generating article including the same.

[0011] However, the problems to be solved by the present disclosure are not limited to the above-described problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

[0012] TECHNICAL SOLUTION

[0013] One embodiment of this disclosure provides a filter section for aerosol generating articles, the filter section comprising: a first filter section including a first filter material; a third filter section disposed opposite to and spaced apart from the first filter section; and a second filter section including a second filter material filling the space between the first filter section and the third filter section, wherein the second filter material comprises an alkaline calcium phosphate-based compound.

[0014] In addition, one embodiment of this disclosure 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.

[0015] Beneficial effects

[0016] A filter unit for aerosol-generating articles according to an embodiment of the present disclosure can effectively remove specific substances included in mainstream smoke while achieving smokeability.

[0017] Furthermore, an aerosol-generating article according to an embodiment of the present disclosure can effectively remove specific substances included in mainstream smoke while providing smokers with excellent smoking performance.

[0018] The effects of this disclosure are not limited to those described above, and those skilled in the art will clearly understand from this specification and the accompanying drawings the effects not mentioned. Attached Figure Description

[0020] Figure 1 This is a diagram illustrating an aerosol-generating article according to an embodiment of the present disclosure.

[0021] Figure 2 This is a cross-sectional view showing an aerosol-generating article according to an embodiment of the present disclosure. Detailed Implementation

[0023] In this specification, unless the context clearly indicates otherwise, the singular form includes the plural form.

[0024] 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.

[0025] 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.

[0026] In this specification, the terms "a and / or b" are used to mean "a or b" and "a and b".

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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".

[0032] 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.

[0033] 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.

[0034] 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.

[0035] In this specification, "longitudinal direction" may refer to the direction corresponding to the longitudinal axis of the aerosol-generating article.

[0037] The composition of this disclosure will be described in more detail below with reference to the accompanying drawings.

[0038] One embodiment of this disclosure provides a filter section for aerosol-generating articles, the filter section comprising: a first filter section including a first filter material; a third filter section disposed opposite to and spaced apart from the first filter section; and a second filter section including a second filter material filling the space between the first filter section and the third filter section, wherein the second filter material comprises an alkaline calcium phosphate-based compound.

[0039] A filter unit for aerosol-generating articles according to an embodiment of the present disclosure can effectively remove specific substances included in mainstream smoke while achieving smokeability. Specifically, the specific substances may be substances with low molecular weight, ionicity, and high volatility. The structure of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0040] One embodiment of this disclosure provides a filter section for aerosol-generating articles, the filter section comprising: a first filter section including a first filter material; a third filter section disposed opposite to and spaced apart from the first filter section; and a second filter section including a second filter material filling the space between the first filter section and the third filter section, wherein the second filter material comprises an alkaline calcium phosphate-based compound.

[0041] A filter unit for aerosol-generating articles according to an embodiment of the present disclosure can effectively remove specific substances included in mainstream smoke while achieving smokeability. Specifically, the specific substances may be substances with low molecular weight, ionicity, and high volatility. For example, the specific substance may be HCHO (formaldehyde).

[0042] According to one embodiment of this disclosure, the first filter section, the second filter section, and the third filter section can be arranged sequentially along the longitudinal direction of the filter section for aerosol generation. Specifically, the first filter section and the third filter section can be arranged to face each other while being spaced apart by a predetermined distance along the longitudinal direction of the filter section for aerosol generation. Therefore, a cavity (empty space) can be formed between the first filter section and the third filter section. The space is filled with the second filter material, thereby forming a second filter section between the first filter section and the third filter section. Here, the longitudinal direction of the filter section for aerosol generation can refer to the direction corresponding to the longitudinal axis of the aerosol generation article, which will be described later.

[0043] According to one embodiment of this disclosure, the filter section for the aerosol-generating article can effectively remove specific substances included in mainstream smoke during smoking by including a second filter section filled with the second filter material. Specifically, the second filter material may include an alkaline calcium phosphate-based compound. The alkaline calcium phosphate-based compound may include hydroxyl groups. By using the alkaline calcium phosphate-based compound, specific substances included in mainstream smoke can be effectively removed.

[0044] According to one embodiment of this disclosure, the alkaline 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 Here, 0≤y≤1), type B hydroxyapatite (Ca 10-x (PO4) 6-x (CO3) x (OH) 2-x Here, at least one of the following is selected: 0≤x≤2, octacalcium phosphate (Ca8H2(PO4)6·5H2O), and tetracalcium phosphate (Ca4(PO4)2O). Specifically, the alkaline calcium phosphate-based compound may include at least hydroxyapatite. By using the above-mentioned types of alkaline calcium phosphate-based compounds, specific substances included in mainstream smoke can be effectively removed.

[0045] According to one embodiment of this disclosure, 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 achieve a filtering effect on mainstream smoke. By using the first filter material of the above type, specific substances included in mainstream smoke can be effectively removed.

[0046] According to one embodiment of this disclosure, the size (average diameter) of the first filter material can be greater than or equal to 0.01 mm and less than or equal to 2 mm. Specifically, the size of the first filter material can be greater than or equal to 0.02 mm and less than or equal to 1.8 mm, greater than or equal to 0.03 mm and less than or equal to 1.6 mm, greater than or equal to 0.04 mm and less than or equal to 1.5 mm, greater than or equal to 0.01 mm and less than or equal to 1.8 mm, greater than or equal to 0.02 mm and less than or equal to 1.6 mm, greater than or equal to 0.03 mm and less than or equal to 1.5 mm, greater than or equal to 0.04 mm and less than or equal to 2 mm, greater than or equal to 0.02 mm and less than or equal to 1.9 mm, greater than or equal to 0.03 mm and less than or equal to 1.8 mm, or greater than or equal to 0.04 mm and less than or equal to 1.7 mm. Here, the size (average diameter) of the activated carbon used as the first filter material can be greater than or equal to 0.01 mm and less than or equal to 2 mm. When the size of the first filter material is within the above range, the filtration effect can be achieved by utilizing the characteristics of the first filter material itself.

[0047] According to one embodiment of this disclosure, the size of the second filter material can be greater than or equal to 0.01 mm and less than or equal to 2 mm. Specifically, the size of the second filter material can be greater than or equal to 0.02 mm and less than or equal to 1.8 mm, greater than or equal to 0.03 mm and less than or equal to 1.6 mm, greater than or equal to 0.04 mm and less than or equal to 1.5 mm, greater than or equal to 0.01 mm and less than or equal to 1.8 mm, greater than or equal to 0.02 mm and less than or equal to 1.6 mm, greater than or equal to 0.03 mm and less than or equal to 1.5 mm, greater than or equal to 0.04 mm and less than or equal to 2 mm, greater than or equal to 0.02 mm and less than or equal to 1.9 mm, greater than or equal to 0.03 mm and less than or equal to 1.8 mm, or greater than or equal to 0.04 mm and less than or equal to 1.7 mm. Here, the size (average diameter) of the hydroxyapatite used as the second filter material can be greater than or equal to 0.01 mm and less than or equal to 2 mm. When the size of the second filter material is within the above range, the space (cavity) is easily filled by the second filter material, thereby improving the oxidation removal efficiency of specific substances included in mainstream smoke.

[0048] According to one embodiment of this disclosure, 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, 1:0.01 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 range, specific substances included in the mainstream smoke can be effectively removed while preventing a reduction in the flowability of the mainstream smoke.

[0049] According to one embodiment of this disclosure, the content of the first filter material per unit length of the first filter section can be greater than or equal to 0.5 mg / mm and less than or equal to 5 mg / mm. Specifically, the content of the first filter material per unit length of the first filter section can be greater than or equal to 1 mg / mm and less than or equal to 4.5 mg / mm, greater than or equal to 1.5 mg / mm and less than or equal to 4 mg / mm, greater than or equal to 2 mg / mm and less than or equal to 3.5 mg / mm, greater than or equal to 0.5 mg / mm and less than or equal to 4.5 mg / mm, greater than or equal to 1 mg / mm and less than or equal to 4 mg / mm, greater than or equal to 1.5 mg / mm and less than or equal to 3.5 mg / mm, greater than or equal to 2 mg / mm and less than or equal to 5 mg / mm, greater than or equal to 1.5 mg / mm and less than or equal to 4.5 mg / mm, or greater than or equal to 2 mg / mm and less than or equal to 4 mg / mm. 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 can be easily obtained while achieving excellent smoking performance.

[0050] According to one embodiment of this disclosure, the content of the first filter substance included in the first filter section can be greater than or equal to 4.5 mg and less than or equal to 75 mg. Specifically, the content of the first filter substance included in the first filter section can be greater than or equal to 5 mg and less than or equal to 70 mg, greater than or equal to 10 mg and less than or equal to 65 mg, greater than or equal to 20 mg and less than or equal to 60 mg, greater than or equal to 30 mg and less than or equal to 50 mg, greater than or equal to 4.5 mg and less than or equal to 70 mg, greater than or equal to 5 mg and less than or equal to 60 mg, greater than or equal to 10 mg and less than or equal to 50 mg, greater than or equal to 20 mg and less than or equal to 55 mg, greater than or equal to 30 mg and less than or equal to 70 mg, greater than or equal to 4.5 mg and less than or equal to 50 mg, greater than or equal to 5 mg and less than or equal to 75 mg, greater than or equal to 10 mg and less than or equal to 55 mg, greater than or equal to 20 mg and less than or equal to 65 mg, or greater than or equal to 30 mg and less than or equal to 60 mg. When the content of the first filter material included in the first filter section is within the above-mentioned range, a filter section capable of effectively removing specific substances included in mainstream smoke while achieving excellent smoking performance can be easily obtained. Here, 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.

[0051] According to one embodiment of this disclosure, the content of the second filter material per unit length of the second filter section can be greater than or equal to 20 mg / mm and less than or equal to 100 mg / mm. Specifically, the content of the second filter material per unit length of the second filter section can be greater than or equal to 25 mg / mm and less than or equal to 90 mg / mm, greater than or equal to 30 mg / mm and less than or equal to 80 mg / mm, greater than or equal to 40 mg / mm and less than or equal to 60 mg / mm, greater than or equal to 20 mg / mm and less than or equal to 90 mg / mm, greater than or equal to 25 mg / mm and less than or equal to 80 mg / mm, greater than or equal to 30 mg / mm and less than or equal to 70 mg / mm, greater than or equal to 35 mg / mm and less than or equal to 60 mg / mm, greater than or equal to 40 mg / mm and less than or equal to 100 mg / mm, greater than or equal to 20 mg / mm and less than or equal to 60 mg / mm, greater than or equal to 30 mg / mm and less than or equal to 100 mg / mm, or greater than or equal to 40 mg / mm and less than or equal to 80 mg / mm. When the content of the second filter material per unit length of the second filter section is within the aforementioned range, the surface area of ​​the second filter material capable of undergoing an oxidation reaction with specific substances included in mainstream smoke can be effectively ensured. Therefore, a filter section capable of effectively removing specific substances included in mainstream smoke can be readily obtained while achieving excellent smoking performance.

[0052] According to one embodiment of this disclosure, the content of the second filter substance included in the second filtration section can be greater than or equal to 100 mg and less than or equal to 500 mg. Specifically, the content of the second filter substance included in the second filtration section can be greater than or equal to 120 mg and less than or equal to 450 mg, greater than or equal to 150 mg and less than or equal to 400 mg, greater than or equal to 170 mg and less than or equal to 370 mg, greater than or equal to 200 mg and less than or equal to 350 mg, greater than or equal to 100 mg and less than or equal to 450 mg, greater than or equal to 120 mg and less than or equal to 400 mg, greater than or equal to 150 mg and less than or equal to 370 mg, greater than or equal to 170 mg and less than or equal to 350 mg, greater than or equal to 200 mg and less than or equal to 500 mg, greater than or equal to 100 mg and less than or equal to 350 mg, greater than or equal to 150 mg and less than or equal to 420 mg, greater than or equal to 200 mg and less than or equal to 400 mg, greater than or equal to 170 mg and less than or equal to 450 mg, or greater than or equal to 120 mg and less than or equal to 350 mg. When the content of the second filter material included in the second filter section is within the above-mentioned range, a filter section capable of effectively removing specific substances included in mainstream smoke while achieving excellent smoking performance can be easily obtained. Here, 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.

[0053] According to one embodiment of this disclosure, the weight ratio of the first filter material to the second filter material can be from 1:2 to 1:20. Specifically, the weight ratio of the first filter material to the second filter material can be 1:3 to 1:18, 1:4 to 1:15, 1:5 to 1:12, 1:2 to 1:18, 1:3 to 1:15, 1:4 to 1:12, 1:5 to 1:20, 1:2 to 1:12, 1:3 to 1:20, 1:4 to 1:18, or 1:5 to 1:15. When the weight ratio of the first filter material to the second filter material is within the above range, specific substances included in mainstream smoke can be effectively removed while achieving excellent smokeability.

[0054] According to one embodiment of this disclosure, 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, specific substances included in mainstream smoke can be effectively removed while achieving excellent smokeability. Here, 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.

[0055] According to one embodiment of this disclosure, the filling rate of the second filter material can be greater than or equal to 55%. Specifically, the density of the second filter material filling the second filter section can be greater than or equal to 55% and less than or equal to 100%, greater than or equal to 60% and less than or equal to 99%, greater than or equal to 55% and less than or equal to 99%, or greater than or equal to 60% and less than or equal to 100%. When the filling rate of the second filter material is within the above range, the surface area of ​​the second filter material capable of undergoing an oxidation reaction with specific substances included in mainstream smoke can be effectively ensured. In addition, the room temperature oxidation capacity of specific substances included in mainstream smoke can be improved, thereby effectively removing specific substances while achieving excellent smoking performance.

[0056] According to one embodiment of this disclosure, the filling rate of the second filter material can be calculated using the internal volume of the second filter section and the volume of the second filter material filling the second filter section.

[0057] Here, the internal volume of the space (cavity) of the second filter section can be calculated using the following Equation 1.

[0058] [Equation 1]

[0059] The internal volume of the second filter section = pi (π) × (diameter of the second filter section / 2) 2 × Length of the second filter section

[0060] The apparent density of the second filter material and the actual weight of the second filter material filling the space (cavity) of the second filter section are measured. The volume of the filled second filter material can be calculated using the following Equation 2.

[0061] [Equation 2]

[0062] The volume of the second filter material = (the actual weight of the second filter material) / (the apparent density of the second filter material)

[0063] Using the internal volume of the second filter section calculated in Equation 1 and the volume of the second filter material filled in Equation 2, the filling rate of the second filter material can be calculated by the following Equation 3.

[0064] [Equation 3]

[0065] The filling rate of the second filter material = (volume of the filled second filter material) / (internal volume of the cavity of the second filter section) × 100

[0066] According to one embodiment of this disclosure, the diameter of the first filter section can be greater than or equal to 5 mm and less than or equal to 10 mm, greater than or equal to 5 mm and less than or equal to 9 mm, or greater than or equal to 5 mm and less than or equal to 8 mm. When the diameter of the first filter section is within the above range, specific substances included in mainstream smoke can be effectively filtered during smoking. Furthermore, the length of the first filter section can be greater than or equal to 10 mm and less than or equal to 20 mm, greater than or equal to 12.5 mm and less than or equal to 17.5 mm, greater than or equal to 10 mm and less than or equal to 15 mm, or greater than or equal to 15 mm and less than or equal to 20 mm. When the length of the first filter section is within the above range, specific substances included in mainstream smoke can be effectively removed during smoking.

[0067] According to one embodiment of this disclosure, the diameter of the second filter section can be greater than or equal to 5 mm and less than or equal to 10 mm, greater than or equal to 5 mm and less than or equal to 9 mm, or greater than or equal to 5 mm and less than or equal to 8 mm. When the diameter of the second filter section is within the above range, specific substances included in the mainstream smoke can be effectively filtered during smoking. Furthermore, the length of the second filter section can be greater than or equal to 2 mm and less than or equal to 10 mm, greater than or equal to 3 mm and less than or equal to 8 mm, greater than or equal to 4 mm and less than or equal to 5 mm, or greater than or equal to 5 mm and less than or equal to 9 mm. 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.

[0068] According to one embodiment of this disclosure, the third filtration section may not include a filter medium. Specifically, the third filtration section may not include at least one of the first filter medium and the second filter medium. In other words, the third filtration section may be a filtration section that does not include a filter medium.

[0069] According to one embodiment of this disclosure, the diameter of the third filter section can be greater than or equal to 5 mm and less than or equal to 10 mm, greater than or equal to 5 mm and less than or equal to 9 mm, or greater than or equal to 5 mm and less than or equal to 8 mm. 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 greater than or equal to 2 mm and less than or equal to 20 mm, greater than or equal to 5 mm and less than or equal to 15 mm, greater than or equal to 7 mm and less than or equal to 9 mm, or greater than or equal to 7 mm and less than or equal to 12 mm. 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.

[0070] According to one embodiment of this disclosure, the filter section for aerosol generating articles includes a first filter section, a second filter section, and a third filter section, and can be formed using various 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.

[0072] Figure 1 This is a diagram illustrating an aerosol-generating article according to an embodiment of the present disclosure.

[0073] One embodiment of this disclosure provides an aerosol generating article, including: a medium section; and a filter section, wherein the filter section includes a filter section for the aerosol generating article.

[0074] An aerosol-generating article according to an embodiment of the present disclosure can effectively remove specific substances included in mainstream smoke while providing smokers with excellent smoking performance.

[0075] Reference Figure 1 The aerosol generating article 100 may include a filter section 110 wrapped by a filter section roll paper 110a, a medium section 120 wrapped by a medium section roll paper 120a, and a tipping paper 130.

[0076] According to one embodiment of this disclosure, the medium may include a smoking material. For example, the smoking material may include tobacco material. Tobacco material may include shredded tobacco leaves, tobacco stems, materials processed therefrom, etc. As a more specific example, tobacco material may include crushed tobacco leaves, crushed reconstituted tobacco, expanded tobacco shreds, expanded tobacco stems, reconstituted tobacco sheets, etc. However, tobacco material is not limited to these. Furthermore, 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.

[0077] According to one embodiment of this disclosure, 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.

[0078] According to one embodiment of this disclosure, the filter section, in addition to including the filter section for aerosol-generating articles, can use any configuration of filter sections used in the art without limitation. The filter section may be located downstream of the medium section and allow aerosol substances generated in the medium section to pass through just before the user inhales them. The filter section can be formed using various materials; for example, the filter section may be a cellulose acetate filter section.

[0079] According to one embodiment of this disclosure, the filter section may be a cellulose acetate filter section containing untreated flavoring substances. However, the filter section is not limited to this and may also be a TJNS (transfer jet nozzle system) filter section containing treated flavoring substances. The filter section may also be a tubular structure including a hollow section inside. Alternatively, the filter section may be prepared by inserting a structure such as a membrane or tube made of the same or different materials into the interior (e.g., the hollow section).

[0080] According to one embodiment of this disclosure, the hardness of the filter section can be adjusted by regulating the content of the plasticizer during the preparation of the filter section. 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.

[0081] According to one embodiment of the present disclosure, the filter section 110 may include a first filter section 111, a second filter section 112, and a third filter section 113.

[0082] Figure 2 This is a cross-sectional view showing an aerosol-generating article according to an embodiment of the present disclosure.

[0083] According to one embodiment of this disclosure, the first filter section, the second filter section, and the third filter section may be arranged sequentially based on a direction from the medium section toward the filter section. For example, after positioning the first filter section and the third filter section at a predetermined distance and positioning the second filter material in the space between the first filter section and the third filter section, the resulting material is wrapped with filter section roll paper to prepare a filter section in which the first filter section, the second filter section, and the third filter section are arranged sequentially.

[0084] Reference Figure 2 The filter section 110 may include a first filter section 111, a second filter section 112, and a third filter section 113. Here, the filter sections arranged from upstream to downstream may be the first filter section 111, the second filter section 112, and the third filter section 113. Since the first filter section 111 and the second filter section 112 of the aerosol generating article filter section are located upstream of the third filter section 113, the aerosol generating article 100 can provide smokers with excellent smoking properties and can effectively remove specific substances included in mainstream smoke.

[0085] According to one embodiment of this disclosure, a capsule (not shown) may be included inside the filter section. The capsule may have a structure in which an inner solution including a fragrance is covered 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. In addition, an auxiliary gelling agent may be further used as the material forming the capsule coating. For example, calcium chloride may be used as an auxiliary gelling agent. In addition, a plasticizer may be further used as the material forming the capsule coating. Here, glycerin and / or sorbitol may be used as plasticizers. In addition, a coloring material may be further used as the material forming the capsule coating.

[0086] 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.

[0087] According to one embodiment of this disclosure, the filter section is located downstream of the medium section and serves to allow aerosol substances generated in the medium section to pass through the filter section just before the user inhales them. The filter section can be wrapped with filter roll paper.

[0088] Alternatively, the media section can be wrapped with media section roll paper. In the media section roll paper, glycerin, combustion promoters such as potassium citrate and / or sodium citrate, which promote the complete combustion of the smoking material through catalysis, may be added. Additionally, fillers such as calcium carbonate, titanium dioxide, and magnesium oxide may also be included.

[0089] According to one embodiment of this disclosure, the media roll may also have a double-roll structure. Specifically, the media roll may include an inner roll that contacts and wraps around the media, and an outer roll that contacts and wraps around the inner roll.

[0090] Furthermore, the media roll paper can be low ignition tendency cigarette paper, wherein at least one low ignition tendency (LIP) band (not shown) is formed. The LIP band can reduce the porosity of the media roll paper, so that when the tobacco combustion reaches the LIP band, the amount of oxygen flowing into the media is reduced, thereby extinguishing the aerosol-generating article during combustion. Here, the LIP band can be a coating formed on the inner surface of the media roll paper. The filter section wrapped by the filter roll paper and the media section wrapped by the media roll paper can be jointly wrapped by a tipping paper. In other words, 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. In addition, the tipping paper comprises a non-combustible material, thereby preventing the filter section from burning due to the combustion of the media section.

[0091] According to one embodiment of this disclosure, the tar delivery of the aerosol-generating article can be less than or equal to 7 mg / cig. Specifically, the tar delivery of the aerosol-generating article can be greater than or equal to 5 mg / cig and less than or equal to 7 mg / cig, greater than or equal to 5.5 mg / cig and less than or equal to 6.5 mg / cig, or greater than or equal to 5 mg / cig and less than or equal to 6 mg / cig.

[0092] According to one embodiment of this disclosure, the nicotine delivery of the aerosol-generating article can be greater than or equal to 0.1 mg / cig. Specifically, the nicotine delivery of the aerosol-generating article can be greater than or equal to 0.1 mg / cig and less than or equal to 1 mg / cig, greater than or equal to 0.1 mg / cig and less than or equal to 0.5 mg / cig, or greater than or equal to 0.5 mg / cig and less than or equal to 1 mg / cig.

[0093] According to one embodiment of this disclosure, the nicotine release amount of the aerosol-generating article relative to the tar release amount can be greater than or equal to 5% and less than or equal to 20%. Specifically, the nicotine release amount of the aerosol-generating article relative to the tar release amount can be greater than or equal to 7% and less than or equal to 15%, greater than or equal to 9% and less than or equal to 12%, greater than or equal to 5% and less than or equal to 10%, or greater than or equal to 9% and less than or equal to 20%. By adjusting the nicotine release amount of the aerosol-generating article relative to the tar release amount within the above-mentioned numerical range, excellent smoking performance can be achieved while improving the removal rate of specific substances.

[0094] According to one embodiment of this disclosure, the removal rate of a specific substance from the aerosol-generated article can be greater than or equal to 5% and less than or equal to 100%. Specifically, the removal rate of a specific substance from the aerosol-generated article can be greater than or equal to 7% and less than or equal to 90%, greater than or equal to 10% and less than or equal to 80%, greater than or equal to 20% and less than or equal to 70%, greater than or equal to 30% and less than or equal to 65%, greater than or equal to 10% and less than or equal to 65%, or greater than or equal to 5% and less than or equal to 70%. By adjusting the removal rate of the specific substance from the aerosol-generated article to the above-mentioned numerical range, the specific substance can be effectively removed.

[0096] In the following description, this disclosure will be described in detail with reference to embodiments in order to specifically describe this disclosure. However, embodiments according to this disclosure can be modified in various different forms, and the scope of this disclosure is not to be construed as limited to the embodiments described below. The embodiments of this specification are provided to describe this disclosure more fully to those skilled in the art.

[0098] Example

[0099] substance

[0100] Activated carbon is prepared as the first filter material, and hydroxyapatite, an alkaline calcium phosphate compound, is prepared as the second filter material.

[0102] Example 1

[0103] Preparation of filter portion

[0104] A filter section is prepared comprising the following parts: a first cellulose acetate filter section containing activated carbon with an average diameter of 0.266 mm; a third cellulose acetate filter section; and a second filter section, wherein the space (cavity) between the first and third filter sections is filled 85% with hydroxyapatite with an average diameter of 0.266 mm. The first, second, and third filter sections each have a diameter of 7.8 mm and lengths of 15 mm, 5 mm, and 7 mm, respectively. The activated carbon content in the first filter section is 30 mg, resulting in an activated carbon content of 2 mg / mm per unit length. The hydroxyapatite content in the second filter section is 293 mg, resulting in a hydroxyapatite content of 58.60 mg / mm per unit length.

[0106] Aerosol-generating article

[0107] Preparation similar to Figure 1 The aerosol generating article shown includes a medium section and a filter section containing the filter section. Here, the filter section comprises a first filter section, a second filter section, and a third filter section arranged sequentially from the medium section toward the filter section. 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 section is 27 mm.

[0109] Examples 2 to 15

[0110] Except for adjusting the diameters of the first and second filter materials, the contents of the first and second filter materials, and the filling rate of the second filter material as shown in Table 1 below, the filter section and the aerosol generating article were prepared in the same manner as in Example 1.

[0112] [Table 1]

[0114] Comparative Example 1

[0115] As shown in Table 2 below, the filter section and aerosol generating article are prepared in the same manner as in Example 1, except that no second filter material is added to the second filter section.

[0117] Comparative Example 2

[0118] As shown in Table 2 below, except that in Example 1, 40 mg of the first filter material was added to the first filter section and 172 mg of the second filter material was added to the second filter section to fill it to 50%, the filter section and aerosol generating article were prepared in the same manner as in Example 1.

[0120] [Table 2]

[0122] Analysis of smoke release based on size of first filter material and second filter material

[0123] The results of gas chromatography (GC) analysis of the aerosol composition of the aerosol-generated articles prepared in each of Examples 1 to 9 and Comparative Example 1 are shown in Table 3 below.

[0125] [Table 3]

[0127] In Table 3, the HCHO removal rate was calculated by comparing the HCHO content measured in each of Examples 1 to 9 with the HCHO content measured in Comparative Example 1.

[0128] Referring to Table 3, it was confirmed that the aerosol-generating articles utilizing the filter section of each of Examples 1 to 9 of this disclosure effectively remove HCHO included in mainstream smoke while maintaining excellent smokeability.

[0129] On the other hand, it can be confirmed that the filter section of Comparative Example 1 has a very poor ability to remove HCHO included in mainstream smoke.

[0131] Analysis of smoke release based on content ratio and packing ratio of first filter material and second filter material

[0132] The aerosol-generating articles prepared in each of Examples 1, 10 to 15 and Comparative Examples 1 and 2 were measured using gas chromatography (GC), and the results are shown in Table 4 below.

[0134] [Table 4]

[0136] The HCHO removal rate in Table 4 was calculated by comparing the HCHO content measured in Comparative Example 2 and Examples 1, 10 to 15 with the HCHO content measured in Comparative Example 1.

[0137] Referring to Table 4, it was confirmed that the aerosol-generating articles utilizing the filter sections of each of Examples 1, 10 to 15 of this disclosure effectively remove HCHO included in mainstream smoke while maintaining excellent smokeability.

[0138] On the other hand, it can be determined that the filter sections of Comparative Examples 1 and 2 have a very poor ability to remove HCHO included in mainstream smoke.

[0140] [Figure Labels]

[0141] 100: Aerosol generating items; 110: Filtration unit

[0142] 110a: Filter section paper roll

[0143] 111: First filtration section; 112: Second filtration section

[0144] 113: Third Filtration Section

[0145] 120: Medium section

[0146] 120a: Media roll paper; 130: Tipping paper

Claims

1. A filter unit for aerosol generating articles, the filter unit for aerosol generating articles comprising: The first filtration section includes a first filtration substance; The third filter section is disposed opposite to the first filter section and spaced apart from the first filter section; as well as The second filtration section includes a second filter material that fills the space between the first filtration section and the third filtration section. The second filter material includes 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 or equal to 0.01 mm and less than or equal to 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 or equal to 0.01 mm and less than or equal to 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 1:2 to 1:

20.

8. The filter unit for aerosol-generating articles according to claim 1, wherein, The filling rate of the second filter material is greater than or equal to 55%.

9. 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 greater than or equal to 0.5 mg / mm and less than or equal to 5 mg / mm.

10. 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 greater than or equal to 20 mg / mm and less than or equal to 100 mg / mm.

11. An aerosol-generating article, comprising: Medium section; as well as Filter section The filter section includes the filter section according to claim 1.

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

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