Aerosol-generating article including an impregnated charcoal paper filter and a flavor capsule

Abstract

The present invention relates to a filter (45) for an aerosol-generating article, the filter (45) extending along a filter axis (F) between an upstream end (55) and a mouth end (60). The upstream end (55) is configured to be in fluid communication with a downstream end of an aerosol-generating substrate. The filter (45) includes an upstream end filter portion (70) that bounds the upstream end (55) and includes an impregnated charcoal paper or nonwoven substrate (83), and a mouth end filter portion (65) that bounds the mouth end (60). The filter further includes at least one flavor capsule (82).

Description

[Technical field]

[0001] The present invention relates to a filter for an aerosol-generating article, comprising charcoal. The present invention also relates to an aerosol-generating article for an aerosol-generating device, comprising such a filter. [Background technology]

[0002] In particular, aerosol-generating articles according to the invention are adapted to operate with aerosol-generating devices, also known as heated non-combustion or HNB devices, such that the aerosol-generating device is adapted to heat, rather than combust, an aerosol-generating substrate contained in the article.

[0003] The popularity and use of risk reduction or risk modification devices (also known as vaporizers or aerosol generating devices) has grown rapidly in recent years as aids to assist habitual smokers wishing to quit smoking traditional tobacco products such as cigarettes, cigars, cigarillos, and rolling tobacco. A variety of devices and systems are available that heat or warm a vaporizable material, as opposed to burning tobacco in traditional tobacco products.

[0004] A commonly available risk reduction or risk modification device is the substrate electrically heated aerosol generating device, or heat-not-burn device, also known as HNB. This type of device typically generates an aerosol or vapor by heating an aerosol-generating substrate, which typically contains moist tobacco or other suitable vaporizable material, to a temperature that is typically lower than the combustion temperature of tobacco but sufficient to generate vapor and / or release volatile substances that condense to form an aerosol. By heating, rather than burning or combusting, the aerosol-generating substrate, an aerosol is released that contains the ingredients desired by the user but does not contain the toxic and carcinogenic by-products of combustion and burning. Furthermore, the aerosol generated by heating tobacco or other vaporizable material typically does not contain the burnt or bitter taste resulting from combustion and burning, which can be unpleasant to the user. Thus, the substrate does not require sugars and other additives that are typically added to such materials to make the smoke and / or vapor more palatable to the user.

[0005] Aerosol-generating articles generally used with HNB devices include an aerosol-generating substrate and a filter. During use of the HNB device, the filter may contact the user's mouth and / or lips. Thus, when the user inhales, the aerosol generated by the aerosol-generating substrate passes through the filter, where the aerosol is cooled and the pressure and taste intensity of the aerosol is reduced. Generally, for conventional cigarettes, the filter may be made of cellulose acetate fibers. However, such aerosol-generating articles with cellulose acetate filters provide high resistance to draw due to the relatively densely packed fiber tows. Additionally, aerosol-generating articles with cellulose acetate filters tend to have reduced flavor intensity because a certain amount of desirable flavor volatiles may remain trapped within the filter. The reduced resistance of cellulose acetate filters may cause manufacturability issues.

[0006] As a countermeasure, it is known to introduce flavour capsules into the filter of the aerosol-generating article. When the flavour is released, such as by breaking the capsule shell as required, it is carried by the aerosol to the mouth end. Thus, the taste of the aerosol is modified by the addition of flavour molecules carried in the aerosol. However, flavour capsules also increase pressure loss which degrades the user experience.

[0007] Aerosol-generating articles may also exhibit a harsh taste due to the tobacco and / or nicotine contained in the aerosol-generating substrate, which may adversely affect the taste of the flavor of the filter that modulates the taste of the substrate.

[0008] Therefore, there is a need for aerosol-generating articles and filters for HNB devices that improve risk reduction, improve the sensory effect by enhancing flavor while maintaining a mild and / or smooth taste, and reduce resistance to drawing. Summary of the Invention [Problem to be solved by the invention]

[0009] One object of the present invention is to provide a filter for an aerosol-generating article designed to be used with an HNB device that provides a better user experience. [Means for solving the problem]

[0010] To this end, the present invention provides a filter for an aerosol-generating article, the filter extending along a filter axis between an upstream end and a mouth end, the upstream end configured to be in fluid communication with a downstream end of an aerosol-generating substrate; The filter is an upstream end filter portion defining an upstream end and including an impregnated charcoal paper or nonwoven substrate; a mouth end filter portion defining a mouth end; -At least one flavor capsule and Including, regarding filters.

[0011] The filter according to the invention can make the taste of the aerosol-generating substance, especially the smoking taste, smoother or milder, enhancing the taste of the flavor added by the filter, while at the same time the resistance to drawing is still acceptable or can even be reduced due to the small pressure loss of the charcoal paper or non-woven filter.

[0012] The impregnated charcoal paper or nonwoven fabric allows the aerosol generated by the aerosol-generating substrate, when the user inhales, to pass through a filter where it comes into contact with the charcoal before reaching the user's mouth, during which the charcoal modifies the taste of the aerosol by making it smoother and milder in taste.

[0013] Impregnated charcoal paper or nonwoven substrate refers to a paper sheet or nonwoven sheet made of natural cellulose that contains fine charcoal particles bonded to or fixed in the substrate of the sheet before the sheet is gathered or rolled to form a filter rod. Impregnated charcoal paper differs from standard paper filters that contain a mixture of loose charcoal particles or granules. In the loose configuration, the charcoal particles or granules are dispersed throughout the paper during the filter rod making process, which must increase the density of the paper filter to maintain the desired distribution of charcoal in the filter.

[0014] In the following description, the term "nonwoven substrate" refers to a nonwoven sheet comprising natural fibers and a binder. The natural fibers preferably comprise or consist of wood pulp, the wood pulp being preferably obtained by the Kraft process. The natural fibers (without considering the charcoal content) preferably constitute 85-95% by weight of the nonwoven substrate, the binder constitutes 5-15% by weight of the nonwoven substrate, the nonwoven substrate has a dry tensile strength of at least 10 N / 5cm, preferably at least 12 N / 5cm, most preferably at least 14 N / 5cm, and the nonwoven substrate has a thickness of 0.4-1.0 mm, preferably 0.5-0.9 mm, most preferably 0.5-0.7 mm. The natural fibers (without considering the charcoal content) preferably constitute 90-93% by weight of the nonwoven substrate, and / or the binder constitutes 7-10% by weight of the nonwoven substrate. The nonwoven substrate (without charcoal) preferably has a dry tensile strength of at least 50 mg / cm 3 , preferably at least 55 mg / cm 3 , and most preferably at least 60 mg / cm 3 and / or a bulk density of up to 110 mg / cm 3 , preferably up to 100 mg / cm 3 , and most preferably up to 90 mg / cm 3 The nonwoven fabric substrate preferably has a volume density of 40 to 65 mg / cm 2 , preferably 45 to 60 mg / cm 2 , and most preferably 45 to 55 mg / cm 2 , and most preferably 45 to 50 mg / cm 2The nonwoven substrate has an areal density of 0.2-0.9 mm. The average length of the natural fibers is preferably at most 3.5 mm, preferably at most 3.0 mm, most preferably at most 2.8 mm, and / or the average length of the natural fibers is at least 2.0 mm, preferably at least 2.3 mm, most preferably at least 2.5 mm. The binder is preferably a water-based polymer emulsion, preferably comprising at least one binder that is water-soluble. The binder may comprise one or more of an aqueous copolymer dispersion of ethylene vinyl acetate (EVA) and polyvinyl acetate (PVA) adhesives. The nonwoven substrate may be crimped in the machine direction with a crimp depth of 0.2-1.0 mm, preferably 0.5-0.9 mm. Nonwoven substrates without charcoal impregnation are described in co-pending European Patent Application Publication No. 22210227.

[0015] The production of impregnated charcoal paper may include mixing charcoal and introducing it during paper production. Methods for producing charcoal-free paper intended for use in filters of aerosol-generating articles are already known in the art, such as, for example, the methods in WO 2019149742 or US 2021195939. Impregnated charcoal paper is obtained, for example, by mixing fine particles of charcoal with cellulose pulp during paper production. In the production of impregnated charcoal paper, the impregnated charcoal paper sheet may be subjected to crimping. The crimped paper sheet allows the fluffiness of the paper to be increased and therefore occupies a large volume. For this method, the charcoal of the impregnated charcoal paper may be highly activated or normally activated.

[0016] Alternatively, the manufacture of impregnated charcoal paper includes producing filter paper according to known methods. Then, charcoal together with a binder is sprayed onto the filter paper to impregnate the filter paper with charcoal. The paper obtained after spraying onto the filter paper is the impregnated charcoal paper. For this method, the charcoal in the impregnated charcoal paper can usually be activated carbon.

[0017] According to some embodiments, the impregnated charcoal paper is a gathered sheet of paper, preferably defining a charcoal linear density of 0.05 to 0.5 mg / 12 mm of charcoal.

[0018] The gathered sheet, preferably having a charcoal linear density within the preferred ranges, can impart a milder or smoother smoking experience to the aerosol while enhancing additional flavors in the aerosol.

[0019] According to some embodiments, the upstream filter section comprises: - 4 to 10 mmWG / mm, preferably 5 to 8 mmWG / mm, most preferably 5 to 7 mmWG / mm, if the upstream filter section contains a flavor capsule (82; 182; 382); -When the flavor capsule is not contained in the upstream end filter portion, it has a pressure loss per unit length of 0.01 to 2 mmWG / mm; The pressure loss is determined according to the ISO 6565:2015 standard.

[0020] Due to this feature, the flavour capsule has only a limited effect on the resistance to drawing.

[0021] According to some embodiments, the mouth end filter portion comprises a filter paper or nonwoven substrate.

[0022] This feature makes it possible to improve the biodegradability of the filter according to the invention.

[0023] According to some embodiments, the density of the filter paper in the mouth end filter section is 0.1 mg / mm 3 ~0.3mg / mm 3 , advantageously 0.13 mg / mm 3 ~0.28mg / mm 3 , more preferably 0.15 mg / mm 3 ~0.25mg / mm 3 It is.

[0024] According to some embodiments, the density of the impregnated charcoal paper in the upstream filter section is 0.120 mg / mm 3 ~0.220mg / mm 3 , advantageously 0.140 mg / mm 3 ~0.200mg / mm 3 It is.

[0025] Because the paper must be compressed and therefore densified to prevent the charcoal from falling out or collecting in smaller areas of the filter, the density of the impregnated charcoal paper can be significantly reduced compared to standard charcoal filters, which typically consist of loose charcoal granules mixed into a paper sheet.

[0026] The density of the filter paper in the mouth end is preferably greater than the density of the impregnated charcoal paper in the upstream filter section, so as to prevent the release of solid particles from the mouth end.

[0027] These features make it possible to provide suitable draw resistance and aerosol taste to satisfy the user.

[0028] According to some embodiments, the filter further includes a hollow intermediate portion extending between the upstream end filter portion and the mouth end filter portion, the flavor capsule being located within the hollow intermediate portion.

[0029] The hollow intermediate portion allows for a reduced resistance to drawing by reducing the pressure loss across the filter compared to filters having capsules embedded in the filter portion.

[0030] According to some embodiments, the flavor capsule is located within the mouth end filter portion.

[0031] This feature ensures that there is no risk of the impregnated charcoal interacting with the flavour of the flavour capsule, and due to the proximity of the mouth end, the flavour release may be perceived as being stronger.

[0032] Furthermore, since it is possible to reduce the density of the impregnated paper filter (thus reducing the pressure loss in the upstream filter section) without compromising the defined position of the capsule, the suction resistance of the filter can be kept low.

[0033] Additionally, this feature allows the upstream filter section to be manufactured by first producing a first continuous rod and then cutting the rod to form a plurality of segments.

[0034] The manufacture of the mouth end filter portion may include manufacturing a second continuous rod including a plurality of capsules enclosed in segments at regular intervals from one another. The second continuous rod may then be cut to obtain separate segments that are assembled to segments of the first rod. Alternatively, the second continuous tube may be cut to obtain successive pairs of segments. Each pair may then be completed on either side by a segment of the first rod and an aerosol-generating substrate. The segments of each pair are then separated to obtain two aerosol-generating articles.

[0035] According to some embodiments, the flavour capsule is located within the upstream end filter portion.

[0036] With this feature, a first continuous rod containing charcoal paper and flavor capsules may be produced and cut to form the upstream end filter section, as described above.

[0037] The second continuous rod can then be cut to form the mouth end filter portions as described above. Alternatively, the mouth end filter portions can be cut to form pairs first and then cut between them after assembly with the rest of the article.

[0038] According to some embodiments, the filter further includes a second flavor capsule located within the mouth end filter portion.

[0039] This feature significantly reduces the overall pressure resistance of the filter compared to conventional dual capsule filters, while allowing for an additional choice of flavors or combinations of two flavors if desired. In general, the user can choose from four possible different combinations of flavors.

[0040] According to some embodiments, the upstream filter portion includes an upstream filter wrapper having a basis weight of greater than 25 gsm, preferably between 45 gsm and 100 gsm, more preferably between 50 gsm and 80 gsm.

[0041] With a flavor capsule contained within the upstream end filter section containing charcoal, the weight of the filter wrapper can be relatively small due to the stiffness of the charcoal paper required to keep the capsule stable in place.

[0042] According to some embodiments, the upstream filter portion comprises an upstream filter wrapper having a basis weight of greater than 45 gsm, preferably between 45 gsm and 120 gsm, more preferably between 80 gsm and 100 gsm. If there are no flavour capsules contained within the upstream filter section, the basis weight of the filter wrapper may be higher to provide sufficient hardness to the charcoal filter section.

[0043] The flavor capsule of the present invention preferably has a diameter of 2.5 mm to 4.5 mm. The flavor capsule may include an outer shell that contains a flavorant that can be released during vaping. When the flavor capsule is located in the mouth end filter portion or the upstream end filter portion, the diameter of the flavor capsule is preferably at least 0.4 times, more preferably at least 0.5 to 0.8 times, the diameter of the filter portion (not considering the thickness of the wrapper). When the flavor capsule is located in the cavity middle portion, the diameter of the flavor capsule is preferably at least 0.4 times, more preferably at least 0.5 to 0.8 times, the diameter of the cavity.

[0044] According to some embodiments, the upstream end filter portion and the mouth end filter portion are encased in a common filter wrapper.

[0045] This feature allows the upstream end filter section and the mouth end filter section to be easily assembled together.

[0046] The present invention also provides an aerosol-generating article comprising: an aerosol-generating substrate defining a downstream end; -The filter as defined above The present invention relates to an aerosol-generating article comprising:

[0047] According to some embodiments, the aerosol-generating article further comprises a cooling or spacing element interposed between the aerosol-generating substrate and the filter.

[0048] The cooling or spacing element can further improve the user experience by cooling the aerosol before it reaches the user's mouth and / or lips. The cooling or spacing element can be formed by a tube extending between the filter and the aerosol-generating substrate. The tube can be hollow or can include additional flow guides, for example to mix the flow emerging from the aerosol-generating substrate and / or to enhance cooling of the aerosol.

[0049] The tube is preferably made of paper or cellulose acetate. The tube may include ventilation areas, such as circumferentially arranged perforations, to dilute the aerosol with fresh air at a certain ventilation rate (e.g., 60-80%) and to aid in cooling the aerosol. The cooling or spacing element may be assembled to the filter by a wrapper, such as tipping paper, which may also extend further upstream to connect the aerosol-generating substrate to the cooling or spacing element. Perforations may also be provided in the wrapper to allow air to flow into the cooling or spacing element. Alternatively, the ventilation area is provided at the upstream filter segment, for example by holes provided through the wrapper that bypass the upstream filter segment.

[0050] The aerosol-forming substrate preferably comprises an aerosol-forming agent and a tobacco material. The content of the aerosol-forming agent in the aerosol-forming substrate is preferably at least 10% by weight, more preferably 11-30% by weight, on a dry basis, of the aerosol-forming substrate. The aerosol-forming agent may be a polyol, such as glycerol, propylene glycol, or 1,3-butanediol, or a combination thereof.

[0051] According to some embodiments, the aerosol generating article may be further configured for use with a heated non-combustion generating device. The present invention also relates to a system including an article as described above and a heated non-combustion generating device including a socket configured to receive the article.

[0052] The invention and its advantages will be better understood on reading the following description, given by way of non-limiting example only and with reference to the accompanying drawings, in which: [Brief description of the drawings]

[0053] [Figure 1] 1 is a schematic diagram of an aerosol-generating assembly including an aerosol-generating article according to the present invention. [Diagram 2] FIG. 2 is a perspective view of the aerosol-generating article of FIG. 1, where the aerosol-generating article includes a filter according to the present invention. [Diagram 3] FIG. 3 is a schematic exploded view of the filter of FIG. 2, the filter being in accordance with a first embodiment of the present invention. [Figure 4] FIG. 3 is a schematic exploded view of the filter of FIG. 2, the filter being in accordance with a second embodiment of the present invention. [Diagram 5] FIG. 3 is a schematic exploded view of the filter of FIG. 2, the filter being in accordance with a third embodiment of the present invention. [Figure 6] FIG. 3 is a schematic exploded view of the filter of FIG. 2, the filter being in accordance with a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0054] Before the present invention is described, it is to be understood that the invention is not limited to the details of construction set forth in the following description. It will be apparent to one skilled in the art having the benefit of this disclosure that the invention is capable of other embodiments and of being practiced or carried out in various ways.

[0055] The expression "substantially equal to" is hereinafter understood as equal to ±10%, preferably ±5%.

[0056] As used herein, the term "aerosol generating device" or "device" may include a vaping device for delivering an aerosol from an aerosol generating article, including, for example, tobacco, received within the device. The device may be portable. "Portable" may refer to a device that is held and used by a user. The device may be adapted to generate a variable amount of aerosol, for example, by activating a heating system for a variable period of time using a trigger (as opposed to a fixed amount of aerosol). The trigger may be user-activated, such as a vaping button and / or an inhalation sensor. The inhalation sensor may be sensitive to inhalation strength and duration, allowing for the provision of a variable amount of vapor (to mimic the smoking effect of a conventional combustible smoking article, such as a cigarette, cigar, or pipe).

[0057] As used herein, the term "control unit" refers to a component of the aerosol generating device that may control the operation of the heating system. The control unit may include a temperature regulation control for manipulating and subsequently maintaining the temperature of the heating system.

[0058] As used herein, the term "aerosol-generating substrate" is used to designate any material capable of forming an aerosol. The aerosol is generally obtained by increasing the temperature of the aerosol-generating substrate, such as a temperature of less than 400°C, preferably up to 350°C. The aerosol-generating substrate may, for example, comprise or consist of an aerosol-generating solid, which may be in the form of a rod, including processed tobacco material, crimped sheets or oriented strips of reconstituted tobacco (RTB), or any combination thereof. The aerosol-generating substrate may contain one or more of nicotine, caffeine, or other active ingredients.

[0059] As used herein, the term "aerosol" may include a suspension of precursors as solid particles, liquid droplets, gas, or one or more of a gas. The suspension may be in a gaseous state, including air. The aerosol may be formed by an aerosol-generating substrate and may include one or more components of the aerosol-generating substrate.

[0060] As used herein, the term "vaping session" may refer to the period of use of an aerosol generating device starting from the activation of a trigger as defined above until the moment the aerosol generating device is disabled.

[0061] As used herein, the term "pressure drop" refers to the static pressure difference across the considered component (e.g., a filter section, a filter, or an aerosol-generating article) when air flows through it under steady-state conditions with a volumetric flow rate of 17.5 ml s-1. Standard conditions for the measurement of pressure drop are given in ISO6565:2015.

[0062] As shown in FIG. 1, the aerosol generating assembly 10 includes an aerosol generating device 15 and an aerosol generating article 20 .

[0063] The aerosol generating device 15 extends along an axis X (hereinafter referred to as "device axis X"). The aerosol generating device 15 includes an outer casing 22 and internal components disposed within the outer casing 22. The outer casing 22 defines a boundary for an article socket 26 and at least one inlet 28 for air to enter the socket 26. The internal components include, for example, a heating system 30 for heating at least a portion of the aerosol-generating article 20, a battery 24 for powering the heating system 30, and a control unit 32 for controlling the power supply to the heating system 30 by the battery 24.

[0064] The battery 24 is a known battery designed to be charged using a power source, such as with an external charger, and to supply a direct current of a predetermined voltage to the heating system 30 .

[0065] The article socket 26 is configured to receive at least a portion of the aerosol-generating article 20. To this end, the article socket 26 may define an aperture 36 opening to the exterior of the aerosol generating device 15 and is adapted to receive at least a portion of the aerosol-generating article 20 within said aperture 36. In Figure 1, the aerosol-generating article 20 is inserted into the aperture 36.

[0066] The inlet 28 allows air to enter from outside the outer casing 22. An internal air flow path may extend from the inlet 28 to direct air to the article socket 26. The inlet 28 may be formed as part of the aperture 36. In particular, the inlet may be a portion of the aperture 36 that is not occupied by the article when inserted into the socket 26, and the air flow may be directed from the inlet to the article through a gap disposed between the socket cavity and the article, such as described in WO2020074602.

[0067] Heating system 30 includes, for example, a heating element, such as a thin resistive film, that may be disposed adjacent to at least a wall of article socket 26. Heating system is configured to generate heat when connected to, for example, battery 24 and powered by battery 24. When aerosol-generating article 20 is inserted into hole 36 and heating system 30 is powered by battery 24, the temperature of heating system 30 is, for example, 200°C to 350°C.

[0068] In a variant not shown, the heating system 30 includes a heating system device portion and a heating system article portion. The heating system device portion may include an electromagnetic emitter configured to generate an electromagnetic field when powered by the battery 24. The emitter may include, for example, a magnetic coil disposed around the article socket 26. The heating system article portion may thus include a susceptor configured to generate heat when traversed by an electromagnetic field. The susceptor may be, for example, integrated into the aerosol-generating substrate of the article 20.

[0069] The control unit 32 is adapted to control the operation of the heating system 30. More specifically, the control unit 32 is configured to control the supply of power to the heating system 30 by the battery 24.

[0070] As shown in FIG. 2, the aerosol-generating article 20 includes an aerosol-generating substrate 40, a filter 45, an article wrapper 47, and, in some embodiments, a cooling or spacing element 42 disposed between the aerosol-generating substrate 40 and the filter 45.

[0071] In a preferred embodiment, the length of the aerosol-generating substrate 40 is between 10 and 30 mm, preferably between 15 and 25 mm, more preferably substantially equal to 20 mm (±2 mm). In said embodiment, the length of the filter 45 is between 10 and 30 mm, preferably between 15 and 25 mm, more preferably substantially equal to 20 mm (±2 mm). In said embodiment, the length of the cooling or spacing element 42 is between 10 and 30 mm, preferably between 15 and 25 mm, more preferably substantially equal to 20 mm (±2 mm).

[0072] Preferably, the length of the aerosol-generating article 20 is between 40 and 90 mm, more preferably between 50 and 70 mm, most preferably between 55 and 65 mm, for example substantially equal to 60 mm (±2 mm).

[0073] The aerosol-generating substrate 40 includes a downstream end 50 adjacent the cooling or spacing element 42 in the example of Figure 2, or adjacent the filter 45 if the cooling or spacing element 42 is not provided. The aerosol-generating substrate 40 is designed to be heated by the heating system 30 of the aerosol-generating device 15 to form an aerosol, as previously described.

[0074] The cooling or spacing element 42 provides a sufficient distance between the aerosol-generating substrate 40 and the mouth end while only marginally affecting the pressure resistance of the article 20. The cooling or spacing element 42 may be configured to cool the aerosol before it reaches the filter 45. The cooling or spacing element 42 may be, for example, a hollow tube, preferably made of paper. During a vaping session, the aerosol generated by the aerosol-generating substrate 40 flows through the cooling or spacing element 42 before it reaches the filter 45. For example, the cooling or spacing element 42 may be hollow or may include additional flow guides that mix the flow generated by the aerosol-generating substrate 40 and / or enhance the cooling effect. The hollow tube preferably abuts the aerosol-generating substrate 40 and is connected by a wrapper 47 (also referred to as "tipping paper"). The cooling or spacing element 42 may further include a ventilation area, preferably formed by at least one row of circumferentially arranged ventilation holes across the wall of the cooling or spacing element 42. These holes may be formed through the hollow tube of the element and through the wrapper 47 to allow air communication from the outside to the hollow interior of the element. The air holes should preferably be positioned at a short distance from the filter 45, preferably 1 mm to 7 mm, more preferably 2.5 mm to 6 mm, most preferably 3 mm to 5.5 mm. The cooling or spacing element 42 may alternatively simply be formed by a portion of the thick wrapper 47 between the substrate 40 and the filter 45. The cooling or spacing element may be defined as described in EP 4042889 A1, paragraphs 17 to 19, "(2) Cooling Segment", which is incorporated herein by reference.

[0075] The aerosol-generating substrate 40, the filter 45, and optionally the cooling or spacing element 42 are held together using an article wrapper 47. As depicted in FIG. 2, the article wrapper 47 may be formed by a unique wrapper that extends along at least a portion of the aerosol-generating article 20. For example, as shown in FIG. 3, the article wrapper 47 may entirely cover the filter 45, the cooling or spacing element 42, and partially cover the aerosol-generating substrate 40. According to other embodiments, the filter 45 may not be partially covered, and / or the aerosol-generating substrate 40 may be entirely covered. According to yet another embodiment, the article wrapper 47 extends the entire length of the aerosol-generating article 20. In a variation not shown, the article wrapper 47 includes multiple wrappers disposed along the aerosol-generating article 20. The wrappers may overlap and are held together, for example, using an adhesive at the overlap.

[0076] The filter 45 extends along a filter axis F between an upstream end 55 and a mouth end 60. In the example of FIG. 2, the upstream end 55 contacts the cooling or spacing element 42, or the upstream end 55 can contact the downstream end 50 of the aerosol-generating substrate 40 if the cooling or spacing element 42 is not provided. In either case, the upstream end 55 and the downstream end 50 are in fluid communication. In other words, during a vaping session, when a user inhales, the aerosol generated by the aerosol-generating substrate 40 passes through the downstream end 50 and through the cooling or spacing element 42 before reaching the upstream end 55. The mouth end 60 of the filter 45 is intended to be received in the mouth of the user.

[0077] The filter 45 may be realized according to one of the embodiments described below. First embodiment of the present invention According to a first embodiment, shown in Figure 3, filter 45 includes a mouth end filter portion 65 adjacent mouth end 60 and an upstream end filter portion 70 adjacent upstream end 55. Mouth end filter portion 65 and upstream end filter portion 70 form separate filter segments that are maintained in close proximity, as described in more detail below.

[0078] The length of the mouth end filter portion 65 may be between 5 mm and 12 mm, preferably between 6 mm and 10 mm, and more preferably substantially equal to 8 mm.

[0079] The length of the upstream filter portion 70 may be between 8 mm and 16 mm, preferably between 10 mm and 14 mm, and more preferably substantially equal to 12 mm.

[0080] The mouth end filter portion 65 includes a filter paper 77. The filter paper material 77 is formed from a gathered sheet of paper which may be further crimped. The crimped paper sheet allows for increased fluffiness of the paper and therefore takes up more of the volume it allows.

[0081] Alternatively, the filter paper 77 comprises paper, preferably made of paper. The filter paper is preferably a gathered sheet of paper. The basis weight of the filter paper sheet 77 is, for example, between 20 and 120 gsm, preferably substantially equal to 35 gsm. The thickness of the filter paper 77 is, for example, between 30 μm and 100 μm. The porosity of the filter paper 77 is preferably between 0 and 3000 CU. The contact angle of the filter paper 77 is less than 90°. The tensile strength of the filter paper 77 is higher than 18 N per 15 mm. Advantageously, the filter paper 77 is made of one sheet, for example a paper tape, by folding the sheet to form a number of layers extending along the filter axis F.

[0082] In some embodiments, the mouth-end filter portion 65 may also include a mouth-end filter wrapper 80 that encases the filter paper 77 of the mouth-end filter portion 65. The wrapper 80 may preferably be made of paper coated with a material that is resistant to staining by flavorants. This material may be oleophobic and / or hydrophobic.

[0083] In the first embodiment, the mouth end filter portion 65 includes flavor capsules 82 encased within the filter paper 77 .

[0084] During a vaping session, the aerosol passes through the upstream end filter portion 270, passes through the mouth end filter portion 65, contacts the flavour capsules 82 and becomes enriched with the flavour of the flavour capsules 82, and then reaches the user's mouth.

[0085] The diameter of the flavor capsule can be 2.5-4.5 mm. The flavor capsule 82 can include an outer shell that contains a flavor releasable during vaping. The flavor can be, for example, a liquid or a powder. The flavor can be, for example, menthol, peppermint, berry, lemon, peach, apple, cardamom, cherry, celery, fenugreek, bergamot, jasmine, ginger, orange oil, lemon oil, cinnamon, and the like.

[0086] The shell of the flavour capsule 82 is preferably breakable by a user squeezing the mouth-end filter portion 65. After such squeezing, the flavourant spreads into the mouth-end filter portion 65 and is absorbed by the filter paper 77. The capsule 82 may be a capsule as described in EP 1906775 B1. For example, the capsule shell may comprise at least one hydrocolloid selected from gellan gum, agar, alginate, carrageenan, pectin, gum arabic, gum ghatti, pullulan gum, mannan gum, or modified starch, either alone or as a mixture or combination thereof. In such a case, the aerosol passing through the mouth-end filter portion 65 during a vaping session will contain a large amount of the flavour of the liquid originally contained within the flavour capsule 82.

[0087] After the filter paper 77 is crimped (optional) and then gathered, multiple sections are formed into a rod with flavor capsules 82 inserted at equal intervals into the filter paper 77, and a mouth end filter wrapper 80 is wrapped around the rod to produce the mouth end filter portion 65. The rod is then cut into individual mouth end filter portions 65 or double lengths for assembly to the upstream end filter portion 70.

[0088] The upstream filter portion 70 forms a low pressure drop filter segment. For example, the pressure drop per unit length of the upstream filter portion 70 is preferably 0.01-2 mmWG per mm. The upstream filter portion 70 includes impregnated charcoal paper 83, for example as the mouth end filter portion 65. Preferably, the upstream filter portion 70 is made only of impregnated charcoal paper 83. The impregnated charcoal paper 83 may be the same paper as the filter paper 77, but impregnated with charcoal. Alternatively, the upstream filter portion 70 and the mouth end filter portion 65 are made of impregnated charcoal nonwoven fabric.

[0089] The impregnated charcoal paper allows the aerosol generated by the aerosol-generating substrate, upon inhalation by a user, to pass through a filter where it contacts the charcoal before reaching the user's mouth, during which time the charcoal absorbs undesirable compounds in the gas or aerosol phase.

[0090] The charcoal in the impregnated charcoal paper 83 can be activated carbon paper having a basis weight of 40-60 gsm, most preferably about 43 gsm.

[0091] The charcoal linear density of the impregnated charcoal paper 83 is between 0.05 mg per 12 mm (also expressed as mg / 12 mm) and 0.5 mg per 12 mm, and more preferably between 0.1 mg / 12 mm and 0.3 mg / 12 mm.

[0092] Charcoal linear density is defined as the amount of charcoal present in a sample of paper cut as a rectangle 1 mm wide per 12 mm long.

[0093] The manufacture of the impregnated charcoal paper 83 may include mixing the charcoal and introducing it during the paper production. Methods for producing charcoal-free paper intended to be used in filters of aerosol-generating articles are already known in the art. This method produces a sheet of impregnated charcoal paper that can be subjected to crimping. The crimped paper sheet allows the fluffiness of the paper to be increased and therefore occupies a large volume. With this method, the charcoal in the impregnated charcoal paper 83 may be highly activated or normal activated.

[0094] Alternatively, the manufacture of the impregnated charcoal paper 83 includes producing filter paper 77. Then, during the manufacture of the upstream end filter section 70, the charcoal is sprayed onto the filter paper 77 together with a binder to impregnate the filter paper 77 with the charcoal. The paper obtained after spraying the filter paper 77 is the impregnated charcoal paper 83. For this method, the charcoal in the impregnated charcoal paper 83 can preferably be activated carbon.

[0095] The advantage of impregnated charcoal over other types of regular activated carbon is that it can reduce the pressure drop of the aerosol.

[0096] Like the filter paper 77, the impregnated charcoal paper 83 may be made from a single sheet, such as a paper tape, by folding the sheet to form multiple layers extending along the filter axis F. The cross-sectional densities of the filter paper 77 in the mouth end filter portion 65 and the impregnated charcoal paper 83 in the upstream end filter portion 70 may be substantially the same or different.

[0097] For example, according to one embodiment, the cross-sectional density of the filter paper 77 in the mouth-end filter portion 65 may be greater than the corresponding density of the impregnated charcoal paper 83 in the upstream-end filter portion 70. In this case, in the first embodiment, the same amount of paper 77, 83 may be used to form both filter portions 65, 70. However, because the flavor capsule 82 is inserted in the mouth-end filter portion 65, the filter paper 77 in the mouth-end filter portion 65 may exhibit a greater cross-sectional density.

[0098] Preferably, the density of the filter paper 77 in the mouth end filter portion 65 is 0.1 mg / mm 3 ~0.3mg / mm 3 , advantageously 0.15 mg / mm 3 ~0.25mg / mm 3 It is.

[0099] Similarly, the density of the impregnated charcoal paper 83 in the upstream end filter section 70 without the capsule is 0.120 mg / mm 3 ~0.220mg / mm 3 , advantageously 0.140 mg / mm 3 ~0.200mg / mm 3 It is.

[0100] According to some embodiments, the upstream end filter portion 70 also includes an upstream end filter wrapper 85 that encases the impregnated charcoal paper 83 of the upstream end filter portion 70. Like the mouth end filter wrapper 80, the upstream end filter wrapper 85 can be made, for example, of paper. Preferably, this wrapper 85 is made of a paper material that is preferably coated with a substrate that resists soiling by oily or water-based substances.

[0101] In some embodiments, at least one of the mouth end filter wrapper 80 and the upstream end filter wrapper 85 is made integral with the corresponding paper 77, 83. Thus, in this case, a first portion of the paper 77, 83 can be folded over to form multiple layers, and then a second portion can be wrapped around the folded layers to form the corresponding wrapper 80, 85.

[0102] Preferably, the filter wrapper 80 of the mouth end filter portion 65 has a basis weight of 20-70 gsm and can have a thickness of substantially 30-80 μm. The filter wrapper 85 of the upstream end filter portion 70 preferably has a basis weight of greater than 45 gsm, preferably between 45 gsm and 120 gsm, more preferably between 80 gsm and 100 gsm, and can have a thickness of substantially 80-125 μm.

[0103] In this first embodiment, to manufacture the upstream end filter portion 70, the impregnated charcoal paper 83 may be folded over to form a continuous tube. An upstream end filter wrapper 85 then surrounds the continuous tube. The tube may be cut at predetermined distances to form the upstream end filter portion 70.

[0104] The upstream end filter wrapper 85 has a basis weight of greater than 45 gsm, preferably between 45 gsm and 120 gsm, and more preferably between 80 gsm and 100 gsm.

[0105] The mouth end filter portion 65 and the upstream end filter portion 70 are held together by a common outer wrapper 87, which may for example have a length equal to the sum of the lengths of the mouth end filter portion 65 and the upstream end filter portion 70. The common outer wrapper 87 may for example be a plug wrap. Preferably, the outer wrapper has a basis weight of substantially 20-70 gsm and the plug wrap has a thickness of substantially 30-80 μm. For example, the plug wrap may have a basis weight of 50 gsm and a thickness of 76 μm.

[0106] Optionally, at least one of the upstream end filter portion 70 and the mouth end filter portion 65 includes a taste improving additive or a performance enhancing additive. Such taste improving additives are, for example, flavorants such as menthol, peppermint, berry, lemon, peach, apple, cardamom, cherry, celery, fenugreek, bergamot, jasmine, ginger, orange oil, lemon oil, cinnamon, coffee, tobacco powder, herbs, spices, flavor enhancers, sugars, sugar substitutes, and combinations thereof, that enhance and / or modify the taste of the aerosol when in contact with the aerosol. The performance additive can be glycerin, PG, PPG, or lactic acid, or combinations thereof.

[0107] To manufacture an aerosol-generating article 20 having a filter 45 according to the first embodiment of the invention, a first continuous rod of impregnated charcoal paper can be manufactured and then cut to form a plurality of upstream end filter portions 70. A second continuous rod of paper can then be manufactured containing a plurality of capsules enclosed within segments at regular intervals from one another. Each segment of the second rod is designed to form a mouth end filter portion 65. The second continuous tube can then be cut to obtain successive pairs of segments. Each pair can then be completed on either side by a segment of the first rod, i.e. the upstream end filter portion 70, and an aerosol-generating substrate. Each pair of segments is then separated to obtain two aerosol-generating articles 20.

[0108] The same manufacturing processes can also be applied to form aerosol-generating articles including filters according to other embodiments described below. Second embodiment of the present invention A filter 145 according to a second embodiment will now be described with reference to Fig. 4, focusing only on the differences from the filter 45 according to the first embodiment. Each element of this second embodiment that is not described should be considered to be similar to the corresponding element of the first embodiment.

[0109] According to the second embodiment, filter 145 includes an oral end filter portion 165 and an upstream end filter portion 170 .

[0110] The mouth end filter portion 165 of the second embodiment is similar to the mouth end filter portion 65 of the first embodiment, except that the mouth end filter portion 165 does not include a flavour capsule 82 .

[0111] The upstream end filter portion 170 according to the second embodiment is similar to the upstream end filter portion 70 according to the first embodiment, except that the upstream end filter portion 170 does not include a flavor capsule 182. The flavor capsule 182 according to the second embodiment is similar to the flavor capsule 82 according to the first embodiment.

[0112] To maintain stability of capsule 182 within upstream filter portion 170, the cross-sectional density of upstream filter portion 170 is preferably greater than the cross-sectional density of mouth end filter portion 165. As a result, upstream filter portion 170 has a greater pressure drop than mouth end filter portion 165. For example, the pressure drop of upstream portion 170 is approximately 137 mmWG per 24 mm, while the pressure drop of mouth end filter portion 165 is approximately 40-60 mmWG per 24 mm.

[0113] In other words, the pressure loss per unit length of the upstream end filter portion 170 is 4 to 8 mmWG / mm, and most preferably 5 to 7 mmWG / mm.

[0114] A similar process to that described above can be used to manufacture an aerosol-generating article including a filter 145 according to the second embodiment. According to this embodiment, instead of arranging a plurality of capsules in a second continuous rod, the capsules can be arranged in a first continuous rod.

[0115] According to the second embodiment, the upstream end filter wrapper 85 has a basis weight of greater than 25 gsm, preferably between 45 gsm and 100 gsm, and more preferably between 50 gsm and 80 gsm.

[0116] The density of the impregnated charcoal paper 83 in the upstream end filter section 170, not including the flavor capsules, is 0.130 mg / mm 3 ~0.220mg / mm 3 , advantageously 0.140 mg / mm 3 ~0.200mg / mm 3 It is. Third embodiment of the present invention A filter 245 according to a third embodiment will now be described with reference to Fig. 5, and only with respect to the differences from the filter 45 according to the first embodiment. Each element of this third embodiment that is not described should be considered to be similar to the corresponding element of the first embodiment.

[0117] According to the third embodiment, a filter 245 includes an oral end filter portion 65 according to the first embodiment and an upstream end filter portion 170 according to the second embodiment.

[0118] Thus, the mouth end filter portion 65 contains a first flavour capsule 82 and the upstream end filter portion 70 contains a second flavour capsule 182 .

[0119] The first flavor capsule 82 and the second flavor capsule 182, for example, are similar and contain the same flavor.

[0120] Alternatively, the first flavor capsule 82 and the second flavor capsule 182 are different. In other words, the first flavor capsule 82 and the second flavor capsule 182 may have different types of shells and / or different flavors, including different tastes.

[0121] Preferably, to keep filter pressure as low as possible, the cross-sectional density of the mouth end filter location 65 is preferably equal to the cross-sectional density of the upstream end filter portion 170 .

[0122] The same process as described above can be used to manufacture an aerosol-generating article including a filter 245 according to the third embodiment. According to this embodiment, multiple capsules can be enclosed within each rod. Fourth embodiment of the present invention A fourth embodiment of filter 345 will now be described with reference to Fig. 6, with reference only to the differences from the first embodiment of filter 45. Each element of this fourth embodiment that is not described should be considered to be similar to the corresponding element of the first embodiment.

[0123] According to the fourth embodiment, filter 345 includes an oral end filter portion 365 adjacent oral end 60, an upstream end filter portion 70 adjacent upstream end 55, and a hollow intermediate portion 375, also referred to as cavity portion 375.

[0124] The mouth end filter portion 365 of the fourth embodiment is similar to the mouth end filter portion 65 of the first embodiment except that the mouth end filter portion 365 does not include a flavour capsule 82. The length of the mouth end filter portion 365 is preferably 5-9mm, more preferably about 7mm.

[0125] The upstream filter section 370 of the fourth embodiment is similar to the upstream filter section 70 of the first embodiment, except that the upstream filter section 370 is substantially shorter.

[0126] In practice, the length of the upstream filter portion 370 may be between 5 mm and 9 mm, preferably about 8 mm. An intermediate cavity portion 375 extends between the mouth end filter portion 365 and the upstream end filter portion 370 .

[0127] An intermediate cavity portion 375 is formed by a common outer wrapper 87 that extends between the filter portions 365, 370. The upstream end filter portion 370 and the mouth end filter portion 365 are spaced apart a fixed length to provide the cavity portion 375. The length of the cavity portion can vary from 4 to 7 mm, and is preferably about 5 mm.

[0128] The common outer wrapper 87 is, for example, a plug wrap. Preferably, the outer wrapper has a basis weight of substantially 20 to 70 gsm and the plug wrap has a thickness of substantially 30 to 80 μm. For example, the plug wrap may have a basis weight of 50 gsm and a thickness of 76 μm.

[0129] One example of filter dimensions equals 7 mm for upstream end filter section 370, 5 mm for hollow mid-section 375, 8 mm for mouth end filter section 365, and 3.5 mm for capsule diameter.

[0130] In the fourth embodiment, the hollow portion 375 contains a flavor capsule 382 .

[0131] The flavor capsule 382 of the fourth embodiment is similar to the flavor capsule 82 of the first embodiment.

[0132] Optionally, the hollow portion 375 includes a taste improving additive or a performance enhancing additive. Such taste improving additives are, for example, flavorants such as menthol, peppermint, berry, lemon, peach, apple, cardamom, cherry, celery, fenugreek, bergamot, jasmine, ginger, orange oil, lemon oil, cinnamon, coffee, tobacco powder, herbs, spices, flavor enhancers, sugars, sugar substitutes, and combinations thereof, that enhance and / or modify the taste of the aerosol when in contact with the aerosol. The performance additive can be glycerin, PG, PPG, or lactic acid.

[0133] The same process as described above can be used to manufacture an aerosol-generating article including a filter 345 according to the fourth embodiment, in which the mouth end filter portion and the upstream end filter portion can be assembled together while simultaneously trapping the capsule between them. Operation of the Invention The operation of the aerosol-generating article 20 according to the present invention, and more specifically, the operation of the filters 45, 145, 245, 345, will now be described. First, the aerosol-generating article 20 is inserted into the article socket 26 of the aerosol-generating assembly 10 .

[0134] Preferably, the user squeezes the filter 45,145,245,345 to collapse the capsule 82,182,382.

[0135] During a vaping session, the aerosol-generating substrate 40 heats up and releases an aerosol. When a user inhales, the aerosol is drawn through the aerosol-generating article 20. In particular, the aerosol passes through the aerosol-generating substrate 40 until it reaches a downstream end 50. If applicable, the aerosol then passes through a cooling or spacing element 42, where the aerosol is cooled. The aerosol then reaches an upstream end 55 of the filter 45.

[0136] The aerosol then passes through the upstream filter section 70, 170, 370 where the aerosol pressure is slightly reduced. The aerosol contacts the impregnated charcoal paper 83. The charcoal in the impregnated charcoal paper 83 absorbs gas phase toxins in the aerosol, including hydrogen cyanide, formaldehyde, ammonia, and crotonaldehyde.

[0137] If the filters 145, 245 are according to the second or third embodiment, respectively, the aerosol reaches the flavor capsule 182, the second flavor capsule 182, respectively. Preferably, the aerosol reaches the flavor of the crushed flavor capsule 182. The aerosol is therefore enriched with the flavor of the flavor.

[0138] Alternatively, if the filter 345 is according to the fourth embodiment, the aerosol flows through the upstream end filter portion 370 and reaches the hollow portion 375. The aerosol reaches the flavor capsule 382. Preferably, the aerosol reaches the flavorant in the crushed flavor capsule 382. Thus, the aerosol is enriched with the flavor of the flavorant.

[0139] The aerosol then reaches the mouth end filter portion 65, 165, 365. The aerosol passes through the filter paper 77 where the pressure of the aerosol drops slightly again.

[0140] If the mouth end filter portion 65 is according to the first or third embodiment, the aerosol then reaches the flavour capsule 82. Preferably, the aerosol reaches the flavourant in the crushed flavour capsule 82. The aerosol is therefore enriched with the flavour of the flavourant.

[0141] Eventually, the aerosol reaches the oral end 60. The aerosol then flows into the user's mouth.

[0142] The total pressure loss per unit length (PD / mm) of the filters 45, 145, 245, 345 according to the invention is preferably less than 6.1 mmWG per mm. More precisely, PD / mm is 4.0 mmWG / mm for filter 45, 5.0 mmWG / mm for filter 145, 6.0 mmWG per mm for filter 245 and 1.0 mmWG / mm for filter 345. The target pressure loss across the aerosol-generating article 20 can be between 1 and 7 mmWG / mm. The pressure loss is measured under standard conditions according to ISO6565:2015. The pressure loss is the static pressure, expressed in mmWG or Pascals (1 mmWG=9.8067 Pa), measured by a calibrated / adjusted pressure loss measuring device between the two ends of the tested filter segment when air flows through it under steady conditions with a measured volumetric flow rate at the output end of 17.5 ml / s under standard conditions. The filter sample is completely enclosed within an impermeable sleeve to prevent air from "short-circuiting" down the outside of the sample. Pressure drop per unit length (PD / mm) is obtained by measuring 96-120 mm of the filter sample and dividing the pressure drop value by the filter length in millimeters.

Claims

1. A filter (45; 145; 245; 345) for an aerosol-generating article (20), said filter (45; 145; 245; 345) extending along a filter axis (F) between an upstream end (55) and a mouth end (60), said upstream end (55) configured to be in fluid communication with a downstream end (50) of an aerosol-generating substrate (40); The filter (45; 145; 245; 345) an upstream filter portion (70; 170; 370) that delimits said upstream end (55) and that comprises an impregnated charcoal paper or nonwoven substrate (83); a mouth end filter portion (65; 165; 365) that delimits said mouth end (60); - at least one flavor capsule (82; 182; 382); Including, The filter (45; 145; 245; 345) wherein the mouth end filter portion (65; 165; 365) comprises a filter paper or nonwoven substrate (77).

2. 2. The filter (45; 145; 245; 345) of claim 1, wherein the impregnated charcoal paper (83) is a gathered sheet of paper defining a linear density of charcoal of 0.05 to 0.5 mg / 12 mm.

3. The upstream end filter portion (70; 170; 370) - 4 to 10 mmWG / mm when said upstream filter part (70; 170; 370) contains said flavour capsules (82; 182; 382); - 0.01 to 2 mmWG / mm if the flavor capsule (82; 182; 382) is not housed in the upstream filter part (70; 170; 370), and has a pressure loss per unit length of The pressure loss is determined according to the ISO 6565:2015 standard. A filter (45; 145; 245; 345) according to claim 1.

4. The density of the filter paper (77) in the mouth end filter portion (65; 165; 365) is 0.1 mg / mm ３ ~0.3 mg / mm ３ 2. A filter (45; 145; 245; 345) according to claim 1, wherein:

5. The density of the impregnated charcoal paper (83) in the upstream filter section (70; 170; 370) is 0.120 mg / mm ３ ~0.220mg / mm ３ 2. A filter (45; 145; 245; 345) according to claim 1, wherein:

6. 2. The filter (345) of claim 1, further comprising a hollow intermediate portion (375) extending between the upstream end filter portion (370) and the mouth end filter portion (365), wherein the flavor capsule (382) is located within the hollow intermediate portion (375).

7. 7. A filter (145; 245) according to claim 6, wherein the diameter of the flavour capsule is at least 0.4 times the diameter of the cavity.

8. 2. The filter (45; 245) of claim 1, wherein the flavor capsule (82) is located within the mouth end filter portion (65).

9. 2. The filter (145; 245) of claim 1, wherein the flavor capsule (182) is located within the upstream filter portion (170).

10. 9. A filter (145; 245) according to claim 8, wherein the diameter of the flavour capsule is at least 0.4 times the diameter of the upstream end filter portion (170) or the diameter of the mouth end filter portion (165).

11. 10. The filter (245) of claim 9, further comprising a second flavor capsule (182) located within the mouth end filter portion (65).

12. 10. The filter (145; 245) of claim 9, wherein the upstream filter portion (170) includes an upstream filter wrapper (85) having a basis weight greater than 25 gsm.

13. 2. The filter (45; 345) of claim 1, wherein the upstream filter portion (70; 370) includes an upstream filter wrapper (85) having a basis weight greater than 45 gsm.

14. 10. The filter (45; 145; 245; 345) of claim 1, wherein the upstream filter portion (70; 170; 370) and the mouth filter portion (65; 165; 365) are encased in a common filter wrapper (87).

15. A filter (45; 145; 245; 345) as described in claim 1, wherein the flavor capsule has a diameter of 2.5 to 4.5 mm and includes an outer shell containing a flavorant that can be released during vaping.

16. An aerosol-generating article (20), comprising: an aerosol-generating substrate (40) that delimits a downstream end (50); a filter (45; 145; 245; 345) according to any one of claims 1 to 15, An aerosol-generating article (20) comprising:

17. 17. The aerosol-generating article (20) of claim 16, further comprising a cooling or spacing element (42) interposed between the aerosol-generating substrate (40) and the filter (45; 145; 245; 345).

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