A filter and an aerosol-generating article

Abstract

This application provides a filter tip and an aerosol generating article. The filter tip includes at least one first filter rod and at least one second filter rod, with each first filter rod being an integral structure. The at least one first filter rod and the at least one second filter rod are arranged in a ring-like nested configuration outward from the center of the filter tip. The filter tip of this application combines the first and second filter rods to form a composite filter tip. The second filter rod can be used for basic filtration, i.e., for indiscriminate basic filtration of aerosols. The first filter rod helps maintain the structural strength of the filter tip and can also be used to achieve other functions beyond basic filtration. The combination of the first and second filter rods satisfies both the filtration efficiency for aerosols and facilitates functional diversification. Furthermore, the filter tip has no segmentation differences along the axial direction, which helps to achieve consistency in the structural strength and function of the filter tip in the axial direction.

Description

Technical Field

[0001] This application relates to the field of atomized aerosol technology, and more particularly to a filter tip and an aerosol generating article. Background Technology

[0002] In related technologies, a cellulose acetate filter tip is provided near the lip end of the aerosol generating product. The cellulose acetate filter tip is used to filter aerosols, but it is difficult for the cellulose acetate filter tip to achieve diversified functions. Utility Model Content

[0003] In view of this, the embodiments of this application aim to provide a filter tip and an aerosol generating article that, while ensuring the filter tip meets the filtration efficiency for aerosols, also facilitates the diversification of filter tip functions.

[0004] This application provides a filter tip for use in aerosol generation products, the filter tip comprising:

[0005] At least one first filter rod, and each first filter rod is an integral structure;

[0006] At least one second filter rod, at least one first filter rod and at least one second filter rod are arranged in a ring nested arrangement outward from the center of the filter nozzle.

[0007] In some implementation schemes, the number of layers in the ring-shaped nested arrangement does not exceed five.

[0008] In some implementations, the first and second filter rods are arranged alternately in a direction outward from the center of the filter tip.

[0009] In some implementations, the first layer is the first filter rod and the second layer is the second filter rod, with the filter tip extending outward from its center.

[0010] In some implementations, the filter tip is cylindrical with an outer diameter of 5mm to 8mm; and / or, the axial length of the filter tip is 15mm to 40mm; and / or, the hardness of the filter tip is not less than 90%.

[0011] In some embodiments, the second filter rod is selected from one or more of the following: cellulose diacetate bundles, polylactic acid fiber bundles, polypropylene fiber bundles, and polyester fiber bundles.

[0012] In some implementations, a single first filter rod is a monolithic structure made of powder.

[0013] In some implementations, the first filter rod contains a fragrance substance.

[0014] In some implementations, the ratio of the flavoring substance to the powder by mass is 5% to 50%.

[0015] In some implementations, the first filter rod contains 0.1 g to 1.0 g / 100 g of methyl aromatic compounds.

[0016] In some embodiments, the first filter rod is provided with at least one air passage hole that extends through the end faces of opposite ends of the first filter rod along the axial direction.

[0017] In some embodiments, the total cross-sectional area of ​​the at least one air passage hole accounts for 20% to 50% of the cross-sectional area of ​​the first filter rod.

[0018] In some implementations, the second layer is the first filter rod in the direction outward from the center of the filter tip. The first filter rod is provided with a plurality of air passage holes, which are arranged circumferentially along the first filter rod.

[0019] In some embodiments, the first layer is the first filter rod in the direction outward from the center of the filter tip, and the at least one air passage includes a central air passage and a plurality of side air passages. The central air passage is located at the center of the first filter rod, and the plurality of side air passages are arranged circumferentially around the central air passage.

[0020] In some implementations, the cross-sectional area of ​​the central airway orifice is larger than the cross-sectional area of ​​the side airway orifices.

[0021] In some implementations, the ratio of the total cross-sectional area of ​​at least one first filter rod to the cross-sectional area of ​​the filter tip is 30% to 80%.

[0022] This application provides an aerosol generating article, comprising:

[0023] The matrix segment is used to generate aerosols;

[0024] And the filter tip of any embodiment of this application, wherein the filter tip is disposed near the lip end of the matrix segment.

[0025] In some embodiments, the matrix segment includes an encapsulation layer and a dispersed atomizing medium, the encapsulation layer encapsulating the dispersed atomizing medium.

[0026] In some implementations, the matrix segment is a combustible matrix segment.

[0027] The filter nozzle of this application embodiment forms a composite filter nozzle by combining a first filter rod and a second filter rod. The second filter rod can be used for basic filtration, that is, for basic filtration of aerosols without discrimination. The first filter rod helps maintain the structural strength of the filter nozzle and can also be used to achieve other functions besides basic filtration, such as selective filtration of aerosols or fragrance carrying. By combining the first and second filter rods, both the filtration efficiency for aerosols can be met, and functional diversification can be achieved. In addition, the first filter rod extends continuously along the axial direction, and the second filter rod extends continuously along the axial direction. Therefore, there are no segmented differences in the axial direction of the filter nozzle, which helps to achieve consistency in the structural strength and function of the filter nozzle in the axial direction. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an aerosol-generated article according to an embodiment of this application;

[0029] Figure 2 This is a cross-sectional view of the filter tip according to the first embodiment of this application, wherein the cutting plane passes through the center line of the filter tip;

[0030] Figure 3 for Figure 2 The filter tip shown is a cross-sectional view under another cutting plane, where the cutting plane is perpendicular to the center line of the filter tip;

[0031] Figure 4 This is a cross-sectional view of the filter tip according to the second embodiment of this application, wherein the cutting plane passes through the center line of the filter tip;

[0032] Figure 5 for Figure 4 The filter tip shown is a cross-sectional view under another cutting plane, where the cutting plane is perpendicular to the center line of the filter tip;

[0033] Figure 6 This is a cross-sectional view of a filter tip according to a third embodiment of this application, wherein the cutting plane passes through the center line of the filter tip;

[0034] Figure 7 for Figure 6 The filter tip shown is a cross-sectional view under another cutting plane, where the cutting plane is perpendicular to the center line of the filter tip;

[0035] Figure 8 This is a cross-sectional view of the filter tip according to the fourth embodiment of this application, wherein the cutting plane passes through the center line of the filter tip;

[0036] Figure 9 for Figure 8 The filter tip shown is a cross-sectional view under another cutting plane, where the cutting plane is perpendicular to the center line of the filter tip;

[0037] Figure 10This is a cross-sectional view of the filter tip according to the fifth embodiment of this application, wherein the cutting plane passes through the center line of the filter tip;

[0038] Figure 11 for Figure 10 The filter tip shown is a cross-sectional view under another cutting plane, where the cutting plane is perpendicular to the center line of the filter tip;

[0039] Figure 12 This is a cross-sectional view of the filter tip according to the sixth embodiment of this application, wherein the cutting plane passes through the center line of the filter tip;

[0040] Figure 13 for Figure 12 The filter tip shown is a cross-sectional view under another cutting plane, where the cutting plane is perpendicular to the center line of the filter tip.

[0041] Explanation of reference numerals in the attached figures

[0042] 10. Matrix segment; 20. Filter tip; 21. First filter rod; 21a. Air passage hole; 22. Second filter rod; 100. Aerosol generation product. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0044] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this invention will not be described separately.

[0045] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0046] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0047] This application provides a filter 20 for use in aerosol generation articles, that is, the filter 20 is a component of the aerosol generation articles.

[0048] Please see Figure 1 This application also provides an aerosol generating article 100, including a matrix segment 10 and a filter 20 according to any embodiment of this application. The filter 20 is disposed near the lip end of the matrix segment 10.

[0049] The matrix segment 10 is used to generate aerosols. For example, the matrix segment 10 releases aerosols when heated.

[0050] In some embodiments, the matrix segment 10 may be an integral structure.

[0051] An integral structure refers to a structure that is formed in one step from a basically uniform slurry without the need for further processes such as folding or gathering to change its external shape. The resulting structure is a single, indivisible physical whole that can maintain its overall state without the need for external components.

[0052] For example, integral structures can be formed through injection molding, compression molding, or extrusion. Extrusion molding refers to a processing method where a raw material mixture is added to an extruder, and the material is heated and plasticized by the action between the extruder barrel and screw, while being pushed forward by the screw, continuously passing through the die head to form products or semi-finished products of various cross-sections. The matrix segment formed by extrusion molding is strip-shaped. After the matrix segment is heated and absorbed or after heating stops, it remains an integral structure, and is not prone to disintegration or falling off.

[0053] In other embodiments, the matrix segment 10 includes a coating layer and a dispersed atomizing medium, with the coating layer encapsulating the dispersed atomizing medium. The dispersed atomizing medium refers to numerous scattered atomizing media aggregated together by constraints from other structures. The dispersed atomizing medium itself cannot maintain a predetermined shape and structural strength, requiring the assistance of other structures (such as a coating layer) to maintain its shape. For example, the atomizing medium can be a filamentous structure (such as traditional tobacco), a sheet-like structure, a granular structure, or a porous solid structure. The matrix segment 10 and the filter tip 20 can be arranged adjacent to each other, or other functional segments, such as a support segment, can be provided between the matrix segment 10 and the filter tip 20; this is not limited here.

[0054] In some embodiments, the matrix segment 10 is a combustible matrix segment, that is, the matrix segment 10 can be ignited and does not need to be used in conjunction with an aerosol generating device. It can be ignited directly, for example, it can be ignited and inhaled directly like a traditional cigarette.

[0055] The filter rod is used to filter the aerosol generated in the matrix section 10.

[0056] Please see Figures 2 to 13 The filter tip 20 includes at least one first filter rod 21 and at least one second filter rod 22. The at least one first filter rod 21 (i.e., all the first filter rods 21) and the at least one second filter rod 22 (i.e., all the second filter rods 22) are arranged in a ring nested arrangement in a direction outward from the center of the filter tip 20.

[0057] The outward direction from the center of the filter nozzle 20 can be understood as a radial outward direction with the center line of the filter nozzle 20 as the axis. For example, when the cross-sectional shape of the filter nozzle 20 is circular, the outward direction from the center of the filter nozzle 20 is a radial outward direction.

[0058] The ring-shaped nested arrangement refers to a roughly multi-ring arrangement on a cross-section perpendicular to the axial direction of the filter tip 20. For example, please refer to... Figure 3 , Figure 5 , Figure 7 , Figure 9 , Figure 11 and Figure 13 These views are cross-sectional views perpendicular to the axis of the filter 20.

[0059] Each first filter rod 21 is a single piece. This single piece structure provides better structural strength, which helps to improve the overall structural strength of the filter nozzle 20.

[0060] In this embodiment, a composite filter 20 is formed by combining a first filter rod 21 and a second filter rod 22. The second filter rod 22 can be used for basic filtration, i.e., for indiscriminate filtration of aerosols. The first filter rod 21 helps maintain the structural strength of the filter 20 and can also be used to achieve other functions besides basic filtration, such as selective filtration of aerosols or fragrance carrying. The combination of the first filter rod 21 and the second filter rod 22 satisfies both the filtration efficiency for aerosols and facilitates functional diversification.

[0061] Furthermore, in the filter 20 of this application embodiment, the first filter rod 21 extends continuously along the axial direction and the second filter rod 22 extends continuously along the axial direction. Therefore, the filter 20 has no segmentation differences in the axial direction, which is beneficial to achieving the consistency of the structural strength and function of the filter 20 in the axial direction.

[0062] After being formed, the first filter rod 21 has numerous micropores. The micropores are interconnected to form microchannels, allowing aerosols to enter. As the aerosols flow through the microchannels, the first filter rod 21 can capture some substances in the aerosols and also has a cooling effect.

[0063] In some embodiments, the first filter rod 21 may be made of a powder or a mixture of powders. A powder mixture refers to a substance composed of two or more powders of different components. It is understood that by mixing powdered materials of different components and then molding them in one piece, the uniformity of the different components in the molded first filter rod 21 can be improved.

[0064] It should be noted that there are no restrictions on the specific processing method for one-piece molding, such as extrusion molding, injection molding, blow molding, compression molding, 3D printing, etc.

[0065] It should be noted that during the preparation process, the powder needs to be mixed with solvent to form a slurry or paste, and then shaped and dried. The first filter rod 21 of the finished filter tip 20 may still contain a certain amount of solvent, or it may not contain any solvent (the solvent has almost completely evaporated). The solvent can be water, VG (Vegetable Glycerin), or PG (Propylene Glycol).

[0066] The first filter rod 21 and the second filter rod 22 each have micropores. The micropores are irregular and belong to the pores in the microscopic sense. They are determined by the manufacturing process of the first filter rod 21 and the second filter rod 22, rather than being artificially processed by tools or molds.

[0067] It should be noted that after the powder is formed, the gaps between the powder particles constitute micropores. The size of the micropores is determined by the gaps between the powder particles after forming.

[0068] For example, the number of layers in the annular nested arrangement does not exceed five. For instance, the number of layers in the annular nested arrangement can be two, three, four, or five. This reduces the manufacturing difficulty of the filter tip 20. It should be noted that, when the circumferential dimensions of the filter tip 20 (which can be understood as the circumference of the filter tip 20) remain unchanged, when the number of layers in the annular nested arrangement exceeds five, the thickness of each layer is small, increasing both the molding difficulty of the first filter rod 21 and the composite difficulty of the first filter rod 21 and the second filter rod 22.

[0069] Preferably, the embodiments of this application are described using two and three layers of ring-shaped nested arrangement as examples.

[0070] For example, along the direction outward from the center of the filter 20, the first layer is the first filter rod 21, and the second layer is the second filter rod 22. In this embodiment, the number of nested layers can be two, three, four, etc.

[0071] In embodiments where the number of the first filter rod 21 and the second filter rod 22 is one each, i.e., in embodiments where the number of layers in the annular nested arrangement is two, please refer to [link to relevant documentation]. Figure 3 and Figure 5 The first filter rod 21 surrounds the outer periphery of the second filter rod 22, meaning the first layer is the second filter rod 22, and the second layer is the first filter rod 21. Alternatively, please refer to... Figure 7 and Figure 9 The second filter rod 22 surrounds the outer periphery of the first filter rod 21, that is, the first layer is the first filter rod 21 and the second layer is the second filter rod 22.

[0072] In multiple embodiments where the number of first filter rods 21 and second filter rods 22 are respectively, all first filter rods 21 may surround the outer periphery of all second filter rods 22, or all second filter rods 22 may surround the outer periphery of all first filter rods 21, or some first filter rods 21 may be located between two second filter rods 22 and / or some second filter rods 22 may be located between two first filter rods 21.

[0073] In embodiments where there is one first filter rod 21 and multiple second filter rods 22, the first filter rod 21 may surround the outer periphery of all the second filter rods 22, all the second filter rods 22 may surround the outer periphery of the first filter rod 21, or the first filter rod 21 may be located between two second filter rods 22.

[0074] In embodiments where there is one second filter rod 22 and multiple first filter rods 21, the second filter rod 22 may surround the outer periphery of all the first filter rods 21, or all the first filter rods 21 may surround the outer periphery of the second filter rod 22, or the second filter rod 22 may be located between two first filter rods 21.

[0075] In some embodiments, the first filter rod 21 and the second filter rod 22 are arranged alternately in the direction outward from the center of the filter nozzle 20. In this embodiment, alternating arrangement means that any two first filter rods 21 will not contact each other in the direction outward from the center of the filter nozzle 20, or any two second filter rods 22 will not contact each other in the direction outward from the center of the filter nozzle 20. In this embodiment, the alternating arrangement is beneficial for ensuring that the first filter rods 21 and the second filter rods 22 function effectively.

[0076] The cross-sectional shape of the filter tip 20 is not limited, such as circular, polygonal, etc.

[0077] In some embodiments, the filter tip 20 has a circular cross-sectional shape, and its outer diameter d is 5mm to 8mm. That is, 5mm ≤ d ≤ 8mm. For example, 5mm, 5.5mm, 5.8mm, 6mm, 6.4mm, 7mm, 7.6mm, and 8mm. This range is suitable for the user to hold the end of the filter tip 20 away from the matrix segment 10 in their mouth.

[0078] The filter nozzle 20 can be cylindrical in shape, that is, the outer diameter of the filter nozzle 20 is set to be constant along the axial direction of the filter nozzle 20.

[0079] The filter tip 20 can also be stepped, with a step change in the outer diameter of the filter tip 20 along its axial direction.

[0080] The filter tip 20 can also be frustum-shaped, with its outer diameter continuously increasing along the axial direction toward the matrix section 10.

[0081] For example, the outer diameter of the filter tip 20 is 5.0mm to 5.8mm (which can be referred to as a fine-branch filter tip). The outer diameter of the filter tip 20 can be 6.0mm to 7.0mm (which can be referred to as a medium-branch filter tip). The outer diameter of the filter tip 20 can be 7.3mm to 8.0mm (which can be referred to as a conventional filter tip).

[0082] In some embodiments, please refer to Figure 1The length L of the filter tip 20 along the axial direction is 15mm to 40mm, that is, 15mm ≤ L ≤ 40mm. For example, 15mm, 18mm, 20mm, 24mm, 26mm, 30mm, 35mm, 40mm, etc. This length range is moderate, which can ensure the filtration effect of aerosols, while avoiding the large amount of aerosols being trapped due to excessive length. In addition, it can also take into account a suitable suction resistance (under the same structure, the longer the length, the greater the suction resistance).

[0083] In some specific embodiments, the length of the filter tip 20 along the axial direction is 20~30mm, that is, 20mm≤L≤30mm. This is beneficial for further balancing the filtration effect on aerosols and the suction resistance.

[0084] In some embodiments, the hardness of the filter tip 20 is not less than 90%. This ensures the structural strength of the filter tip 20 and provides suitable shaping performance.

[0085] The measurement conditions for the hardness of filter tip 20 can be found in Chinese national or industry standards, and will not be elaborated here.

[0086] In some embodiments, the powder includes: cellulose-based substances, starch-based substances, filler-based substances, gum-based substances, and sugar-based substances.

[0087] Cellulose substances include, but are not limited to: microcrystalline cellulose, methylcellulose, ethylcellulose, carboxymethylcellulose, etc.

[0088] Starchy substances include, but are not limited to: amylose, amylopectin, modified starch, etc.

[0089] Filler materials include, but are not limited to: diatomaceous earth, talc, light calcium carbonate, calcium stearate, etc.

[0090] Gum-like substances include, but are not limited to: xanthan gum, guar gum, tamarind gum, etc.

[0091] Carbohydrates include, but are not limited to: glucose, pullulan, glucomannan, etc.

[0092] In some embodiments, the second filter rod 22 is selected from one or more of the following: cellulose acetate tow, polylactic acid cellulose tow, polypropylene cellulose tow, and polyester cellulose tow. The tow is arranged in a longitudinal and regular pattern. Due to the structure of the tow, during suction, the mainstream aerosol airflow flows along the axial direction of the tow of the second filter rod 22, directly and quickly reaching the user's mouth. Therefore, the second filter rod 22 can filter indiscriminately and has low suction resistance.

[0093] In some embodiments, the first filter rod 21 contains a fragrance substance. The fragrance substance is mixed in with the powder.

[0094] The flavor materials include, but are not limited to, mint essence, lemon essence, blueberry essence, watermelon essence, etc.

[0095] It should be noted that the flavor substance can be mixed into the powder before the first filter rod 21 is integrally formed and molded together with the powder. In this way, the flavor substance is evenly dispersed in the first filter rod 21, which is beneficial to improving the taste consistency.

[0096] In addition, adding the flavor substance before molding is beneficial to accurately controlling the addition amount of the flavor substance in the first filter rod 21.

[0097] In the embodiment of the present application, since the first filter rod 21 is of an integral structure, it is beneficial to achieve a high content of flavor-carrying. And because the first filter rod 21 has micropores and has good flavor-carrying ability, the aerosol carries the flavor substance during the process of flowing through the micropores, realizing slow release of the aroma, the aroma release per puff is uniform, and the flavor substance is not easily lost. Therefore, the filter tip 20 (or the aerosol generating product) can be stored for a long time.

[0098] In the related art, flavor substances are added by methods such as direct flavoring on the filter tip, flavor-carrying addition by core wire, flavoring technology with adsorbent, capsule flavor-carrying method, microcapsule flavor-carrying method, etc. These flavoring methods have a low flavor addition amount, and there are problems such as poor slow release effect of the aroma and uneven aroma release per puff, resulting in a strong flavor in the first few puffs during抽吸, and a weak or even no flavor in the last few puffs. In addition, the flavor substance is seriously lost, and the flavor substance is easily lost during storage, resulting in a short storage period of the product (when the loss amount of the flavor substance exceeds a certain proportion, it means that the product has failed to meet the standard and has passed the shelf life).

[0099] In some embodiments, the ratio of the mass of the flavor substance (hereinafter referred to as G1) to the mass of the powder (hereinafter referred to as G) is from 5% to 50%. That is, 5% ≤ G1 / G ≤ 50%. Specifically, 5% ≤ G1 / G ≤ 50%, or 20% < G1 / G ≤ 50%. For example, G1 / G is 5%, 8%, 10%, 14%, 20%, 26%, 30%, 34%, 40%, 45%, 50%, etc. In this way, the method of integral molding of the powder body enables the first filter rod 21 to achieve the addition of the flavor substance content within a large range according to the design.

[0100] In some embodiments, the mass ratio of the flavor substance (hereinafter referred to as G1) to the powder is from 5% to 20%, that is, 5% ≤ G1 / G ≤ 20%.

[0101] [[ID=二十一]]In some embodiments, the mass ratio of the flavor substance (hereinafter referred to as G1) to the powder is from 10% to 20%, that is, 10% ≤ G1 / G ≤ 20%.

[0102] In some embodiments, the first filter rod 21 contains 0.1g to 1.0g of methyl aromatic compounds per 100g of powder. That is, 0.1g to 1.0g of methyl aromatic compounds are added per 100g of powder. Thus, the formed first filter rod 21 also contains methyl aromatic compounds, which can capture aldehydes and ketones (such as formaldehyde, acetaldehyde, acrolein, etc.) in aerosols, thereby reducing the release of aldehydes and ketones from aerosols entering the user's mouth.

[0103] Methyl aromatic compounds refer to compounds in which one or more methyl groups (-) are attached to an aromatic ring (such as a benzene ring, naphthalene ring, etc.). Organic compounds.

[0104] In some embodiments, please refer to Figure 4 , Figure 5 , Figure 8 , Figure 9 , Figure 12 and Figure 13 The first filter rod 21 is provided with at least one air passage hole 21a, which penetrates the end faces of opposite ends of the first filter rod 21 along the axial direction. The air passage hole 21a helps to improve the air permeability of the first filter rod 21 and reduce the suction resistance.

[0105] It should be noted that the airway pore 21a mentioned above is a pore in a macroscopic sense, while the micropore is a pore in a microscopic sense. The cross-sectional area of ​​the airway pore 21a is much larger than that of the micropore, for example, at least 20 times larger.

[0106] The micro-airway is connected to the airway orifice 21a. Since the micro-airway is formed by the interconnection of micropores, the micropore 10d is connected to the airway orifice 21a. Furthermore, it can be understood that the interconnection between micropores can be partial, with some micropores not connected, or all micropores can be interconnected. A portion of the aerosol in the micro-airway can also be collected at the airway orifice 21a and delivered to the user's mouth under the negative pressure of suction. The airway orifice 21a helps reduce the suction resistance for the user, improving the user experience. It should be noted that suction resistance is positively correlated with the flow resistance of the aerosol; the lower the flow resistance of the aerosol, the lower the suction resistance experienced by the user, and vice versa.

[0107] A single airway opening 21a may extend in a straight line or in a curve, or a portion of the length of a single airway opening 21a may extend in a straight line and another portion may extend in a curve, etc., without any limitation.

[0108] In some embodiments, the total cross-sectional area of ​​at least one air passage 21a (i.e., the sum of the cross-sectional areas of all air passages 21a) accounts for 20% to 50% of the cross-sectional area of ​​the first filter rod 21. For example, 20%, 26%, 30%, 34%, 40%, 45%, 50%, etc. In this embodiment, the total cross-sectional area of ​​the air passages 21a is moderate, which can balance the structural strength and suction resistance of the first filter rod 21.

[0109] In some embodiments, the ratio of the total cross-sectional area of ​​at least one first filter rod 21 (i.e., the sum of the cross-sectional areas of all the first filter rods 21) to the cross-sectional area of ​​the filter tip 20 is 30% to 80%. For example, 30%, 34%, 40%, 45%, 50%, 54%, 60%, 70%, 80%, etc. That is, the first filter rod 21 has a suitable size, taking into account the overall structural strength, function, and suction resistance of the filter tip 20.

[0110] It should be noted that in the embodiment where the first filter rod 21 contains both fragrance substances and methyl aromatic compounds, the filter tip 20 has both good filtration capabilities, capturing harmful substances (such as tar) in aerosols and reducing the content of harmful substances in aerosols entering the user's mouth, and also enabling the aerosols entering the user's mouth to carry fragrance, thereby enhancing the aroma and quality.

[0111] The following is a brief description of six specific embodiments in conjunction with the accompanying drawings.

[0112] First Embodiment

[0113] Please see Figure 2 and Figure 3 The filter tip 20 has two layers arranged in a ring-shaped nesting pattern. The outermost layer (which can also be understood as the second layer) is the first filter rod 21, and the inner layer (i.e. the first layer) is the second filter rod 22. That is, the first filter rod 21 surrounds the outer periphery of the second filter rod 22.

[0114] The first filter rod 21 is an extrusion filter rod. The second filter rod 22 is a cellulose acetate filter rod.

[0115] The length L of the filter tip 20 along the axial direction is 20mm~30mm.

[0116] The cross-sectional area of ​​the first filter rod 21 accounts for 30% to 50% of the cross-sectional area of ​​the filter nozzle 20. The first filter rod 21 does not have air passage holes.

[0117] The first filter rod 21 is manufactured by extrusion, with an extrusion temperature of 80°C.

[0118] The powder of the first filter rod 21 includes: microcrystalline cellulose, modified starch, light calcium carbonate, glucose, xanthan gum, and methyl aromatic compounds.

[0119] The raw material pulping process is as follows: the above powders are mixed evenly, then the flavoring substance is dissolved in a solvent to obtain a mixed liquid, and finally the powder mixture and the mixed liquid are mixed evenly. The amount of flavoring substance added is 10%.

[0120] After the slurry is extruded and formed, it is then assembled and compounded with cellulose acetate filter rods to obtain, as shown in the figure. Figure 2 and Figure 3 The two-layer composite filter tip shown.

[0121] Second Embodiment

[0122] Please see Figure 4 and Figure 5 The main structure of the second embodiment is largely the same as that of the first embodiment. The main differences are: the first filter rod 21 in the first embodiment does not have air passage holes, while the first filter rod 21 in the second embodiment is provided with air passage holes 21a.

[0123] The first filter rod 21 is provided with a plurality of air passage holes 21a, which are arranged along the circumference of the first filter rod 21.

[0124] The multiple airway orifices 21a have the same cross-sectional shape. Of course, the multiple airway orifices 21a can also have different cross-sectional shapes.

[0125] Specifically, each airway opening 21a is circular. Of course, it can also be other shapes, such as triangles, quadrilaterals, ellipses, etc.

[0126] All airway holes 21a have the same cross-sectional area. Multiple airway holes 21a are evenly distributed along the circumference of the first filter rod 21a (of course, they can also be non-uniformly distributed).

[0127] The total area of ​​the airway pores 21a accounts for 20-50% of the cross-sectional area of ​​the first filter rod 21. The cross-sectional area of ​​the first filter rod 21 refers to the total area defined by its contour, for example, in... Figure 5 In the middle, the first filter rod 21 is in the shape of a ring, and the cross-sectional area of ​​the first filter rod 21 is the area of ​​the ring.

[0128] The formaldehyde content in the aerosol filtered by the filter in the second embodiment was compared with that of the comparative example filter. The results showed that the formaldehyde content in the aerosol filtered by the filter in the second embodiment was reduced by 24.2% compared with the comparative example filter. Notably, all the filters in the comparative example were made of cellulose acetate.

[0129] Third Embodiment

[0130] Please see Figure 6 and Figure 7The filter tip 20 has two layers arranged in a ring. The outermost layer (which can also be understood as the second layer) is the second filter rod 22, and the inner layer (i.e. the first layer) is the first filter rod 21. That is, the second filter rod 22 surrounds the outer periphery of the first filter rod 21.

[0131] The first filter rod 21 is an extrusion filter rod. The second filter rod 22 is a cellulose acetate filter rod.

[0132] The length L of the filter tip 20 along the axial direction is 20mm~30mm.

[0133] The cross-sectional area of ​​the first filter rod 21 accounts for 50-80% of the cross-sectional area of ​​the filter nozzle 20. For example, in Figure 7 In the middle, the first filter rod 21 is circular, and the cross-sectional area of ​​the first filter rod 21 is the area of ​​the circle.

[0134] The first filter rod 21 has no air passage holes.

[0135] The first filter rod 21 is manufactured by extrusion, with an extrusion temperature of 80°C.

[0136] The powder of the first filter rod 21 includes: microcrystalline cellulose, modified starch, light calcium carbonate, glucose, xanthan gum, and methyl aromatic compounds.

[0137] The powder of the first filter rod 21 includes: microcrystalline cellulose, modified starch, light calcium carbonate, glucose, xanthan gum, and methyl aromatic compounds.

[0138] The raw material pulping process is as follows: the above powders are mixed evenly, then the flavoring substance is dissolved in a solvent to obtain a mixed liquid, and finally the powder mixture and the mixed liquid are mixed evenly. The amount of flavoring substance added is 20%.

[0139] After the slurry is extruded and formed, it is then assembled and compounded with cellulose acetate filter rods to obtain, as shown in the figure. Figure 6 and Figure 7 The two-layer composite filter tip 20 is shown.

[0140] Fourth embodiment

[0141] Please see Figure 8 and Figure 9 The main structure of the fourth embodiment is largely the same as that of the third embodiment. The main differences are: the first filter rod 21 in the third embodiment does not have air passage holes, while the first filter rod 21 in the fourth embodiment is provided with multiple air passage holes 21a.

[0142] The aforementioned multiple airway holes 21a (i.e. all the airway holes 21a on the first filter rod 21 of the second layer) include a central airway hole 21a1 and multiple side airway holes 21a2. The central airway hole 21a1 is located at the center of the first filter rod 21, and the multiple side airway holes 21a2 are arranged circumferentially around the central airway hole 21.

[0143] The cross-sectional area of ​​the central airway orifice 21a1 is larger than the cross-sectional area of ​​the side airway orifice 21a2. Of course, in other embodiments, the cross-sectional area of ​​the central airway orifice 21a1 may also be equal to or smaller than the cross-sectional area of ​​the side airway orifice 21a2.

[0144] The central airway orifice 21a1 has a circular cross-sectional shape. Of course, it can also be other shapes, such as triangles, quadrilaterals, ellipses, etc.

[0145] The cross-sectional shape of the side airway opening 21a2 is circular. Of course, it can also be other shapes, such as triangle, quadrilateral, ellipse, etc.

[0146] The total area of ​​the air passage 21a accounts for 20% to 50% of the cross-sectional area of ​​the first filter rod 21.

[0147] The formaldehyde content in the aerosol filtered by the filter in the fourth embodiment was compared with that of the comparative example filter. The results showed that the formaldehyde content in the aerosol filtered by the filter in the fourth embodiment was reduced by 26.2% compared with the comparative example filter. Notably, all the filters in the comparative example were made of cellulose acetate.

[0148] Fifth Embodiment

[0149] Please see Figure 10 and Figure 11 The filter nozzle 20 has three layers arranged in a ring-like nested pattern. The outermost and innermost layers are the second filter rods 22, and the middle layer is the first filter rod 21, that is, the first filter rod 21 is located between the two second filter rods 22.

[0150] The first filter rod 21 is an extrusion filter rod. The second filter rod 22 is a cellulose acetate filter rod.

[0151] The length L of the filter tip 20 along the axial direction is 20mm~30mm.

[0152] The cross-sectional area of ​​the first filter rod 21 accounts for 30% to 50% of the cross-sectional area of ​​the filter nozzle 20. The first filter rod 21 does not have air passage holes.

[0153] The first filter rod 21 is manufactured by extrusion, with an extrusion temperature of 80°C.

[0154] The powder of the first filter rod 21 includes: microcrystalline cellulose, modified starch, light calcium carbonate, glucose, xanthan gum, and methyl aromatic compounds.

[0155] The raw material pulping process is as follows: the above powders are mixed evenly, then the flavoring substances are dissolved in a solvent to obtain a mixed liquid, and finally the powder mixture and the mixed liquid are mixed evenly.

[0156] After the slurry is extruded and formed, it is first assembled with the inner second filter rod 22, and then assembled with the outer second filter rod 22 to obtain the following... Figure 10 and Figure 11 The three-layer composite filter tip shown.

[0157] Sixth Embodiment

[0158] Please see Figure 12 and Figure 13 The main structure of the sixth embodiment is largely the same as that of the fifth embodiment. The main differences are: the first filter rod 21 in the fifth embodiment does not have air passage holes, while the first filter rod 21 in the sixth embodiment is provided with multiple air passage holes 21a.

[0159] Specifically, the first and third layers are both second filter rods 22, and the second layer is a first filter rod 21.

[0160] The first filter rod 21 is provided with a plurality of air passage holes 21a, which are arranged along the circumference of the first filter rod 21.

[0161] The multiple airway orifices 21a have the same cross-sectional shape. Of course, the multiple airway orifices 21a can also have different cross-sectional shapes.

[0162] Specifically, each airway opening 21a is circular. Of course, it can also be other shapes, such as triangles, quadrilaterals, ellipses, etc.

[0163] All airway holes 21a have the same cross-sectional area. Multiple airway holes 21a are evenly distributed along the circumference of the first filter rod 21a (of course, they can also be non-uniformly distributed).

[0164] The total area of ​​the airway holes 21a accounts for 20% to 50% of the cross-sectional area of ​​the first filter rod 21. The cross-sectional area of ​​the first filter rod 21 refers to the total area defined by its contour, for example, in Figure 13 In the middle, the first filter rod 21 is in the shape of a ring, and the cross-sectional area of ​​the first filter rod 21 is the area of ​​the ring.

[0165] The formaldehyde content in the aerosol filtered by the filter in the sixth embodiment was compared with that of the comparative example filter. The results showed that the formaldehyde content in the aerosol filtered by the filter 20 in the sixth embodiment was reduced by 25.8% compared with the comparative example filter. Notably, all the filters in the comparative example were made of cellulose acetate.

[0166] In the description of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine different embodiments or examples described in this application, as well as features of different embodiments or examples.

[0167] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A filter for an aerosol-generating article, characterised in that, include: At least one first filter rod, wherein a single first filter rod is an integral structure; At least one second filter rod, wherein the at least one first filter rod and the at least one second filter rod are arranged in a ring nested arrangement outward from the center of the filter nozzle.

2. A filter according to claim 1, characterised in that The number of layers in the ring-shaped nested arrangement does not exceed five.

3. A filter according to claim 1, characterised in that The first filter rod and the second filter rod are arranged alternately in a direction outward from the center of the filter nozzle.

4. A filter according to claim 1, characterised in that Along the direction outward from the center of the filter tip, the first layer is the first filter rod, and the second layer is the second filter rod.

5. The filter according to claim 1, characterized in that, The filter tip has a circular cross-sectional shape and an outer diameter of 5mm to 8mm. And / or, the length of the filter tip along the axial direction is 15mm to 40mm.

6. A filter according to claim 1, characterised in that The second filter rod is selected from one of the following: cellulose acetate tow, polylactic acid fiber tow, polypropylene fiber tow, and polyester fiber tow.

7. A filter according to claim 1, characterised in that Each of the first filter rods is a one-piece structure made of powder.

8. A filter according to claim 6, characterised in that The first filter rod contains a fragrance substance.

9. A filter according to claim 8, characterised in that The aroma substance accounts for 5% to 50% of the mass of the powder.

10. A filter according to any one of claims 1 to 9, characterised in that, The first filter rod contains 0.1g~1.0g / 100g of methyl aromatic compounds.

11. A filter according to any one of claims 1 to 9, characterised in that, The first filter rod is provided with at least one air passage hole, which penetrates the end faces of opposite ends of the first filter rod along the axial direction.

12. The filter tip according to claim 11, characterized in that, The total cross-sectional area of ​​the at least one air passage hole accounts for 20% to 50% of the cross-sectional area of ​​the first filter rod.

13. A filter according to claim 11, characterised in that Along the direction outward from the center of the filter tip, the second layer is the first filter rod, which is provided with a plurality of air passage holes arranged circumferentially along the first filter rod.

14. A filter according to claim 11, characterised in that Along the direction outward from the center of the filter tip, the first layer is the first filter rod, and the at least one air passage includes a central air passage and a plurality of side air passages. The central air passage is located at the center of the first filter rod, and the plurality of side air passages are arranged circumferentially around the central air passage.

15. A filter according to claim 14, characterised in that The cross-sectional area of ​​the central airway is larger than that of the side airway.

16. A filter according to any one of claims 1 to 9, characterised in that The total cross-sectional area of ​​the at least one first filter rod accounts for 30% to 80% of the cross-sectional area of ​​the filter tip.

17. An aerosol-generating article comprising, include: The matrix segment is used to generate aerosols; And the filter tip according to any one of claims 1-16, wherein the filter tip is disposed near the lip end of the matrix segment.

18. An aerosol-generating article according to claim 17, wherein, The matrix segment includes an encapsulation layer and a dispersed atomizing medium, wherein the encapsulation layer encapsulates the dispersed atomizing medium.

19. An aerosol-generating article according to claim 17 or 18, wherein, The matrix segment is a combustible matrix segment.

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