Filters for smoking articles or aerosol generating products

Abstract

A filter for a smoking article or an aerosol generating product, comprising filter material and three capsules comprising an additive, the capsules being arranged in sequence in a direction along the longitudinal axis of the filter.

Description

Technical Field

[0001] The present invention relates to a filter for a smoking article or an aerosol-generating product, and to a smoking article or an aerosol-generating product comprising a filter. Background Art

[0002] Known smoking article filters, such as cigarette filters, typically include continuous filamentary cellulose acetate tow. The cellulose acetate is gathered together to form a rod, which is cut to form individual filter segments. Smoking article filters may be made from one segment of the filter rod, or may be made from multiple segments, with or without cavities or spaces between them. Summary of the invention

[0003] According to an embodiment of the present invention, there is provided a filter for a smoking article or an aerosol generating product, comprising a filter material and three capsules comprising an additive, the capsules being arranged in sequence in a direction along a longitudinal axis of the filter.

[0004] The filter may include a continuous filter material. The filter may include a cellulose acetate filter material. The capsule may be embedded in the filter material. The capsule may be embedded in the cellulose acetate.

[0005] The capsule may be located in the filter at a position other than the longitudinal center of the filter. The capsule may be located in the filter at a position from 1 mm to 10 mm from the longitudinal center of the filter. Alternatively, the capsule may be arranged in sequence along the longitudinal center axis of the filter.

[0006] The capsules may be in predetermined positions and / or in a predetermined order.

[0007] In one embodiment, there are only three capsules in the filter.

[0008] In one embodiment, the filter does not contain microcapsules.

[0009] According to an embodiment of the invention, there is also provided a smoking article or an aerosol generating product comprising a filter as defined above.

[0010] The filter includes three capsules containing additives. The additives (such as flavorings) are encapsulated in the capsules. The capsules allow the consumer to release the additives when the filter is subjected to external forces. The release of the additives (such as flavorings) changes the smoke passing through the filter. Encapsulating the additives can avoid unintentional release or migration of the additives during manufacturing or storage.

[0011] Capsule can be a fragile capsule.Fragile capsule allows the consumer to crush the capsule and release the contents of the capsule, such as additives / flavorings.Three capsules can provide the consumer with the choice of which additive / flavoring to release and / or how many additives / flavorings to release.For example, in the embodiment where these three capsules comprise the same additive / flavoring by the same amount, 1,2 or 3 additives / flavorings of the release increase amount are crushed in the described capsule.Alternatively, in the embodiment with three capsules comprising different flavorings, the consumer is provided with the choice of which (which) flavorings to release, including the different combinations of flavorings.For example, a single flavoring can be released, a combination of the two in the three flavorings can be released, or all three flavorings can be released for example simultaneously.When three capsules are adopted, the available selection range of the consumer increases greatly.Three capsules have also increased the scope of the pressure drop (all capsules are crushed, two capsules are crushed or a single capsule is crushed) that the filter must operate under.

[0012] The arrangement of the capsules in the filter (i.e., arranged in sequence along the longitudinal axis of the filter) ensures that when smoke is drawn through the filter along the filter in the longitudinal direction, the smoke contacts each capsule in a predetermined order. Therefore, when the capsule is crushed, the smoke can contact the released additives / flavorings in a predetermined order. Therefore, the placement of the capsules can be designed to ensure that the desired additive effect (e.g., flavor) is achieved by the capsules. For example, when included in a smoking article, the flavoring released from the capsule farthest from the mouth end (ME) will have a reduced impact on the user's experience compared to the flavoring released from the capsule or intermediate capsule closest to the mouth end (ME) of the smoking article. This effect can be used to form a different / improved experience (e.g., taste) for the consumer.

[0013] Positioning the capsules in sequence along the longitudinal axis of the filter allows the additives released from the capsules to be effectively mixed. When smoke is drawn through the filter, the smoke contacts the capsules one by one in a predetermined order. Since the capsules are aligned axially along the filter, the smoke contacting the first flavoring agent will subsequently contact the second capsule and then the third capsule, thereby providing efficient mixing. The consumer also has the option of rupturing any combination of capsules, which increases the consumer's control over the overall taste of the smoke and increases the range of tastes that the consumer can achieve.

[0014] The capsule includes an additive. For example, the capsule may include a flavoring agent. The three capsules may contain the same flavoring agent or different flavoring agents. In the case where the three capsules contain the same flavoring agent, the capsules may contain the same amount or different amounts of flavoring agent.

[0015] The flavoring agent may be a liquid.

[0016] The flavoring agent adopted in the capsule can be any flavoring agent applicable to the smoking article filter.For example, the flavoring agent can enhance the user's experience.Suitable flavor or seasoning include, but are not limited to, menthol, mint, chocolate, liquorice, citrus, cranberry, blueberry, mojito cocktail, vanilla, spice flavor, plant essential oil or other fruit flavors.The specific combination of flavor includes, but is not limited to, blueberry and mojito cocktail, cranberry and menthol or menthol and blueberry.

[0017] In some embodiments, the flavoring agent can be selected from one or more of a mint flavor, a citrus flavor, and a fruit flavor. In some embodiments, the flavoring agent can be one or more of spearmint, citric acid, and cranberries. In some embodiments, the flavoring agent can be a combination of a mint flavor, a citrus flavor, and a fruit flavor. In some embodiments, the flavoring agent can be a combination of spearmint, citric acid, and cranberries.

[0018] The capsule can have any suitable weight. For example, the capsule weight can be from about 9 mg to about 18 mg, from about 11 mg to about 16 mg, or from about 13 mg to about 14 mg.

[0019] The capsule may have any suitable structure in which the additive / flavoring agent is encapsulated in the capsule. The capsule may include an outer shell and an inner core containing the additive / flavoring agent. The outer shell may be substantially continuous. The outer shell seals the additive / flavoring agent inside the capsule, but the capsule (e.g., outer shell) is fragile or breakable to allow release of the additive / flavoring agent when an external force is applied to the capsule.

[0020] The capsule may have a burst strength of from about 0.8 kp (8 N) to about 2.4 kp (24 N), from about 1.2 kp (12 N) to about 2.0 kp (20 N), from about 1.4 kp (14 N) to about 1.8 kp (18 N), or about 1.60 kp (16 N).

[0021] The capsule may have any suitable shape, such as a sphere, ellipsoid, cylinder or ellipsoid.The cross-section perpendicular to the axis of the filter may be circular.

[0022] The diameter of the capsule is measured as the longest dimension of its cross section perpendicular to the axis of the filter. The diameter of the capsule can be from about 2.0 mm to about 6.0 mm. Alternatively, the diameter of the capsule can be less than about 3.5 mm. In certain embodiments, the diameter of the capsule can be from about 2.2 mm to about 3.8 mm, about 2.4 mm to about 3.4 mm, about 2.6 mm to about 3.2 mm, about 2.7 mm to about 3.1 mm, about 2.8 mm to about 3.0 mm, or 2.8 mm, or 3.0 mm.

[0023] The filter material may comprise one or more of any suitable materials, such as cellulose acetate.

[0024] The filter material may have any suitable circumference including, but not limited to, from about 16 mm to about 25 mm, from about 16 to about 18 mm, from about 19 mm to about 22 mm, or from about 23 mm to about 25 mm.

[0025] The fibers of the filter material may have a fiber denier of from about 3.0 denier per filament (dpf) to about 10.0 dpf, from about 4.5 dpf to about 10.0 dpf, from about 4.5 dpf to about 8.0 dpf, from about 3.0 dpf to about 5.0 dpf, or from about 4.0 dpf to about 5.0 dpf.

[0026] Combinations of filter materials having specific circumferences with specific fiber deniers have been found to be useful. Certain combinations provide acceptable levels of filtration while avoiding crushing of the capsules during the process for incorporating the capsules into the filter material.

[0027] In one embodiment, the circumference of the filter material may be from about 16 mm to about 18 mm, and the fibers of the filter material have a fiber denier of from about 4.5 dpf to about 10.0 dpf.

[0028] In another embodiment, the circumference of the filter material can be from about 19 mm to about 22 mm, and the fibers of the filter material have a fiber denier from about 4.0 dpf to about 5.0 dpf. For example, the fiber denier can be about 5.0 dpf.

[0029] In another embodiment, the circumference of the filter material can be from about 23 mm to about 25 mm, and the fibers of the filter material have a fiber denier from about 3.0 dpf to about 5.0 dpf. For example, the fiber denier can be about 3.0 dpf.

[0030] The filter material may have a total denier of from about 12,000 to about 40,000, from about 15,000 to about 40,000, from about 15,000 to about 23,000, from about 30,000 to about 35,000, or from about 35,000 to about 40,000.

[0031] Combinations of filter materials having a particular circumference and a particular overall denier have been found to be useful. Certain combinations provide acceptable levels of filtration while avoiding crushing of the capsules during the process for incorporating the capsules into the filter material.

[0032] In one embodiment, the circumference of the filter material may be from about 16 mm to about 18 mm and the filter material has an overall denier of from about 15,000 to about 23,000.

[0033] In another embodiment, the circumference of the filter material can be from about 19 mm to about 22 mm, and the filter material has a total denier from about 25,000 to about 35,000. For example, the total denier can be about 30,000.

[0034] In another embodiment, the circumference of the filter material can be from about 23 mm to about 25 mm, and the filter material has a fiber denier from about 30,000 to about 40,000. For example, the total denier can be about 40,000.

[0035] Before the capsule is crushed, the filter may have a resistance to draw (RTD) from about 75 mm / Wg to about 100 mm / Wg or from about 80 mm / Wg to about 95 mm / Wg.

[0036] After the capsule is crushed, the filter may have a resistance to draw (RTD) from about 85 mm / Wg to about 110 mm / Wg, from about 90 mm / Wg to about 100 mm / Wg.

[0037] In one embodiment, the circumference of the filter material may be from about 16 mm to about 18 mm and the RTD before the capsule is crushed may be from about 110 mm / Wg to about 160 mm / Wg.

[0038] In another embodiment, the circumference of the filter material can be from about 19 mm to about 22 mm and the RTD before the capsule is crushed is from about 86 mm / Wg to about 94 mm / Wg and / or the RTD after the capsule is crushed is from about 95 mm / Wg to about 100 mm / Wg.

[0039] In another embodiment, the circumference of the filter material can be from about 23 mm to about 25 mm and the RTD before the capsule is crushed is from about 80 mm / Wg to about 85 mm / Wg and / or the RTD after the capsule is crushed is from about 86 mm / Wg to about 92 mm / Wg.

[0040] Plasticizers may also be added to the fibers. Examples of suitable plasticizers include, but are not limited to, triacetin. The amount of plasticizer added to the fibers may be from about 2% to about 13%, from about 2% to about 10%, or from about 3% to about 6%, based on the weight (wt / wt) of the fibers.

[0041] The capsule may be located in a single segment of the filter, or the capsule may be located in two separate segments of the filter.

[0042] The distance between the capsules can be any suitable distance. For example, the distance between the capsules can be from about 8 mm to about 12 mm, from about 7 mm to about 11 mm, from about 8 mm to about 10 mm, about 9 mm, or about 10 mm.

[0043] The length of the filter can be up to about 50 mm, up to about 40 mm, up to about 35 mm, up to about 30 mm, up to about 25 mm, from about 16 mm to about 24 mm, from about 18 to about 22 mm, or about 20 mm. Alternatively, the length of the filter can be from about 20 mm to about 40 mm, from about 25 mm to about 35 mm, or about 30 mm. The length of the filter is measured parallel to the axis of the filter.

[0044] The three capsules may be equally spaced within the filter. Alternatively, the capsules may be unevenly spaced within the filter.

[0045] For illustration purposes, when incorporated into a smoking article, the third capsule is located closest to the mouth end, the first capsule is located furthest from the mouth end (ie closest to the tobacco rod end), and the second capsule is located between the first and third capsules.

[0046] In one arrangement, the three capsules may be evenly spaced along the axis of the filter. For example, the distance between the first capsule and the second capsule is the same as the distance between the second capsule and the third capsule. The distance between the first capsule and the second capsule may be from about 9 mm to about 11 mm; the distance between the second capsule and the third capsule may be from about 9 mm to about 11 mm; the distance between the first capsule and the end of the tobacco rod of the filter may be from about 4 mm to about 6 mm; and the distance between the third capsule and the mouth end of the filter may be from about 4 mm to about 6 mm.

[0047] In one arrangement, the filter comprises two or more filter sections.In one embodiment, the filter comprises a first filter section and a second filter section, the first filter section being disposed further from a mouth end of the filter than the second filter section.

[0048] The three capsules may be arranged in any one of two or more filter sections. For example, the first capsule may be arranged in the first filter section, and the second and third capsules may be arranged in the second filter section. Alternatively, the first and second capsules may be arranged in the first filter section, and the third capsule may be arranged in the second filter section. The second capsule is arranged between the first and third capsules.

[0049] The respective lengths of the filter segments may be in any suitable ratio.The length of the filter segments may depend on the arrangement of the capsule.

[0050] In embodiments where the first and second capsules are disposed in the first filter segment and the third capsule is disposed in the second filter segment, the length of the first filter segment may be about 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, or 22 mm, and / or the length of the second filter segment may be about 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or 11 mm. In embodiments where the first capsule is disposed in the first filter segment and the second and third capsules are disposed in the second filter segment, the length of the first filter segment may be about 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or 11 mm, and / or the length of the second filter segment may be about 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, or 22 mm.

[0051] In some embodiments where the first capsule is disposed in the first filter segment and the second and third capsules are disposed in the second filter segment, the length of the first filter segment is about 10 mm, and the length of the second filter segment is about 17 mm. In some embodiments where the first and second capsules are disposed in the first filter segment and the third capsule is disposed in the second filter segment, the length of the first filter segment is about 17 mm, and the length of the second filter segment is about 10 mm.

[0052] In some embodiments where the first capsule is disposed in the first filter segment and the second and third capsules are disposed in the second filter segment, the length of the first filter segment is about 9 mm, and the length of the second filter segment is about 18 mm. In some embodiments where the first and second capsules are disposed in the first filter segment and the third capsule is disposed in the second filter segment, the length of the first filter segment is about 18 mm, and the length of the second filter segment is about 9 mm.

[0053] The length of the filter segment is measured parallel to the axis of the filter.

[0054] When the filter includes a first and a second filter section, a filter with a higher degree of consistency can be produced. For example, a filter that always includes three capsules therein can be produced. For the detection of more than one capsule in a filter section, it is important to separate the capsules by a minimum distance. This distance corresponds to the accuracy of the mechanical device used to check whether the capsule has been successfully included in the filter section. When three or more capsules are included in a single filter section, it is difficult to maintain the required interval between the capsules so that each of the capsules can be detected, for example, during quality control. As a result, some filters can include more than three capsules, while some filters can include less than three capsules. However, according to some embodiments of the present invention, in the case where these three capsules are distributed throughout two or more filter sections, the minimum required interval can be maintained. For example, when the second and third capsules are included in a single filter section, the position of the capsule in the filter section and the interval between them can be determined. Such a filter section can be combined with a similar filter section in which the position of the capsule is known. Using this method, it can be ensured that filters with three capsules are always produced and that the capsules are positioned within an acceptable tolerance of the desired capsule position in the filter. For example, by enabling reliable detection of the capsule position, such an embodiment can ensure that the third capsule is positioned at least a minimum distance from the mouth end of the filter to avoid visible shielding at the exposed end of the filter. In addition, such an embodiment can ensure that the first and second capsules are positioned away from the zone in which the ventilation opening is to be formed, so that the capsules will not be damaged when the ventilation opening is formed.

[0055] In order to ensure that smoke is drawn through the filter with limited resistance, perforations may be provided in the filter to provide a ventilation effect. The perforations may be positioned anywhere on the surface of the filter and extend into the filter. In some embodiments, the perforations extend partially through the filter. In some embodiments, the perforations extend through the entire filter. In some embodiments, the perforations are arranged on the surface of the filter in a pattern. In some embodiments, the perforations form a line across the circumference of the filter.

[0056] In some embodiments, when the filter comprises a first filter section and a second filter section, the first filter section may comprise perforations arranged in a line along the circumference of the first filter section, the line being perpendicular to the longitudinal axis of the first filter section.

[0057] Preferably, the perforations may be arranged between the first end of the first filter section and the first capsule, the first end of the first filter section being arranged closer to the mouth end of the filter than the first capsule. The filter according to this embodiment exhibits maintained structural rigidity while providing the necessary ventilation effect. In some embodiments, the perforations may be arranged between 17 mm and 22 mm from the mouth end of the filter. Preferably, the perforations are arranged at 20 mm from the mouth end of the filter.

[0058] Alternatively, the perforations may be arranged in the area of ​​the first filter section in which the first capsule is arranged. In this embodiment, preferably, the perforations are formed using a laser, the laser being configured to form 24 individual perforations. The laser may be configured to use a pulse width of 100 μs. The perforations formed by such a laser do not damage the capsule contained in the filter. In these embodiments, the perforations may be arranged between 18 mm and 25 mm, preferably between 21 mm and 23 mm, from the mouth end of the filter. More preferably, the perforations are arranged 21 or 22 mm from the mouth end of the filter.

[0059] The first capsule may be centrally disposed along the longitudinal axis of the first filter segment. Alternatively, the first capsule may be eccentrically disposed along the longitudinal axis of the first filter segment. When the capsule is eccentrically disposed, the capsule may be disposed closer to the first end of the first filter segment than the second end of the first filter segment, the first end of the first filter segment being disposed closer to the mouth end of the filter than the second end of the first filter segment. In some embodiments, the first capsule is disposed 4 mm from the first end of the first filter segment. In some embodiments, the first capsule is disposed 5 mm from the first end of the first filter segment. Preferably, the first capsule is disposed 4 mm from the first end of the first filter segment. When the first capsule is disposed 4 mm from the first end of the first filter segment, uniform filter color may be maintained even after the third capsule has been broken.

[0060] In some embodiments, the filter is wrapped by a plug wrap. In some embodiments, the plug wrap is a high wet strength plug wrap. The high wet strength plug wrap helps maintain a uniform filter color even after the third capsule has been broken.

[0061] The capsule may be surrounded by a filter material.

[0062] The capsule can be elongated. The capsule can have a longitudinal axis parallel to the axial direction of the smoking article or filter in which the capsule is located. The capsule can be generally tubular and have a maximum cross-sectional area defined in a plane perpendicular to the longitudinal axis. The cross-sectional area of ​​the capsule can be generally constant along most of the length of the capsule. Alternatively, the cross-sectional area of ​​the capsule can vary along its length. The term "elongated" can be considered to mean that the size of the capsule in one direction is substantially greater than the size of the capsule in two perpendicular directions. The longer dimension exceeds the manufacturing tolerance of the generally spherical capsule. For example, the longer dimension can be at least 1.5 times the maximum transverse dimension, or at least 2 times the maximum transverse dimension.

[0063] The capsule may have an outer surface that is generally cylindrical. The longitudinal ends may be rounded, for example, so that the ends are generally hemispherical. The capsule may include an outer wall and an inner volume filled with a fluid. The additive may be selectively released into the adjacent filter material by the user of the smoking article by squeezing the outside of the filter tip to deform or rupture the outer wall of the capsule.

[0064] The capsule may be configured to release all of the additive content when the outer wall is ruptured. Alternatively, the capsule may be configured to release only a portion of the additive under inward pressure from the user, such that the capsule is configured to release the additive content in multiple discrete deliveries.

[0065] Known smoking articles can generally have a maximum transverse dimension, which is the diameter of a circular cross section. In the case of ultra-fine cigarettes or their filters, the maximum transverse dimension or diameter can be 5-6mm, for example, about 5.4mm, which can be called ultra-fine. The diameter of the filter will generally be slightly smaller than the filter to accommodate the wrapper. The spherical capsule can have a diameter that is a relatively large proportion of the cross-sectional area of ​​the filter. The capsule may cause an adverse effect on the flue gas flow rate and / or pressure drop. The capsule can have a relatively small diameter so as to reduce the impact of the capsule on the properties of the filter. The capsule can be elongated, but not spherical, so that a sufficient amount of additives can be included. The maximum transverse dimension of the capsule is less than 4mm, or less than 3.5mm, and preferably from 2.2mm to 2.8mm. The elongated capsule can have a length from 7mm to 11mm, for example from 8mm to 10mm or about 9mm. Alternatively, the length can be from 5mm to 7mm, for example about 5.5mm.

[0066] In smoking articles or filters having a thin, semi-thin or super-thin format, a combination of capsules having a maximum transverse dimension (diameter) of less than 3.5 mm provides the desired amount of additive and affects smoke flow rate and / or pressure drop within acceptable thresholds. In smoking articles having these small diameter formats, the specific dimensions (transverse and length) of the elongated capsules provide an advantageous combination of parameters that provide the desired amount of additive without significantly affecting pressure drop.

[0067] Alternatively, the capsule can have a non-elongated shape. In some aspects, the capsule can be spherical or roughly spherical. For a specific maximum transverse dimension (diameter), a spherical capsule may be able to contain a smaller amount of additives than an elongated capsule. For a filter tip or smoking article of smaller diameter, the additive of the reduced amount can be substantially as effective as the additive of the higher amount in a filter tip or smoking article of larger diameter. A filter tip or smoking article of smaller diameter can have a maximum transverse dimension less than 7.6mm or less than 7mm, or any range specified in any embodiment. The diameter of a spherical capsule can be less than 3.5mm, or any range of diameters specified in any embodiment. The radial dimension is applicable to both elongated and spherical capsules.

[0068] The length of the capsule may be from 4mm to 15mm. The capsule has an outer length of from 7mm to 11mm, and in some aspects from 8mm to 10mm or about 9mm.

[0069] Alternatively, the capsule can have an outer length of from 4mm to 15mm, and in some aspects from 5mm to 7mm or from 5mm to 6mm. In some aspects, the capsule length is about 5.5mm. The maximum lateral extent of the capsule can be from 2.2mm to 2.8mm, and preferably about 2.5mm.

[0070] Alternatively, the length of the capsule is from 11 mm to 15 mm, or from 12 to 14 mm, or about 13.6 mm. The maximum lateral extent of the capsule may be from 2.2 mm to 2.8 mm, and about 2.5 mm.

[0071] Alternatively, the outer maximum lateral range of the capsule of any type or embodiment or the diameter of the circular cross section can be in the range of 4.5 mm to 7 mm. The maximum lateral range can be less than 7 mm, less than 6 mm, less than 5 mm or less than 4 mm. The maximum lateral range can be between 3 mm and 4 mm. Especially, in combination with the filter tip / smoking article with the diameter between 5 mm and 6 mm (for example, about 5.4 mm), the maximum lateral range of the capsule can be between 3 mm and 4 mm (for example, about 3.5 mm). In combination with any upper limit, capacity or relative cross-sectional area, the maximum lateral range can be greater than 1 mm.

[0072] These dimensions may be applicable to any type of capsule. Longer length additive release members may be used with capsules comprising a matrix. The matrix may contain approximately 40% additive by volume.

[0073] The diameter and length of the capsule determine the maximum volume of additives that can be contained. Therefore, the selection of a relatively small diameter can be used in combination with a relatively high length to contain the desired amount of additives. Any combination of sizes can be used, including sizes outside the indicated range. The shell of any embodiment can have a thickness of about 0.2 mm.

[0074] The use of capsules having a maximum transverse dimension (or diameter of circular cross-section) of less than 3.5 mm, from about 2.7 mm to about 3.1 mm or about 3 mm can ensure that uniform filter color is maintained when one or more of the capsules are ruptured by reducing or eliminating filter 'spotting' (wherein the capsule contents penetrate to the surface of the filter and form spots on the filter) even after the third capsule has been ruptured.

[0075] Including three capsules comprising an additive and having a maximum transverse dimension (or diameter of circular cross-section) of less than 3.5 mm, from about 2.7 mm to about 3.1 mm or about 3 mm into a filter for a smoking article can also provide the consumer with a choice of which additive to release and / or how much additive to release by choosing not to crush any capsules, crushing 1, 2 or all 3 capsules, while reducing or eliminating 'spotting' of the filter.

[0076] The smoking article or filter containing the capsule can have a diameter from 4mm to 10mm, for example from 5mm to 7mm, or from 5mm to 6mm or from 5.1mm to 6mm (ultra-fine). In some respects, from 5.2mm to 5.6mm, or from 5.3mm to 5.5mm, for example about 5.4mm. In the case where the smoking article or filter is in a thin, semi-fine, ultra-fine or micro-fine specification, it can have a diameter less than about 7.6, 7.0, 6.0 and 5.1 mm respectively (corresponding approximately to a perimeter less than 24, 22, 19 and 16 mm respectively). In the case where the smoking article or filter is in a conventional specification, it can have a diameter of 7.6-8.0 mm (corresponding approximately to a perimeter of 24-25mm). The so-called "wide" specification can have a diameter greater than 8.0mm (corresponding approximately to a perimeter greater than 25mm).

[0077] The small lateral extent of the capsule may be advantageous for reducing the pressure drop in any diameter smoking article, although the advantages have a particular effect on smaller diameter smoking articles. In conjunction with relatively sized capsules, the present invention is applicable to smoking articles or filters of any diameter. For example, the smoking article may have a diameter of one of 5mm, 5.3mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.3mm, 7.5mm, 7.7mm, 8mm to one of 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 7.9mm, 8.5mm in any combination.

[0078] The capsule can have an additive capacity of from 3 μL to 50 μL, or from 3 μL to 10 μL, or from 10 μL to 30 μL, and optionally from 15 μL to 25 μL, or from 20 μL to 30 μL, or from 8 μL to 20 μL, or about 20 μL, or about 30 μL. Any upper or lower limit of capacity can be used in combination. In particular, the capacity of the capsule can be from 3 μL, 5 μL, 8 μL, 10 μL, 15 μL, 20 μL, 25 μL, 30 μL, 35 μL, 40 μL to 5 μL, 8 μL, 10 μL, 15 μL, 20 μL, 25 μL, 30 μL, 35 μL, 40 μL, 45 μL, 50 μL.

[0079] Alternatively, the maximum lateral extent of the capsule can be one of the following: 1.5mm to 2.5mm, 1.5mm to 3mm, 1.5mm to 3.5mm, 2mm to 2.5mm, 2mm to 3mm, 2mm to 3.5mm, 2.5mm to 3mm, 2.5mm to 3.5mm, 3mm to 4mm, 3.5mm to 4mm. The maximum lateral extent of the additive release member can be from 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, 5.1mm, 5.2mm, 5. 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm to a lower lateral range of one of 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4. 2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm , a higher lateral range of one of 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6.0mm, 6.1mm, 6.2mm, 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7.0mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, and 8.0mm.

[0080] However, these ranges are not intended to be limiting, and those skilled in the art will appreciate that larger or smaller filters or capsules may be employed. References to diameters indicate the maximum transverse dimension of a capsule. For capsules that are not circular in cross-section, the above diameter values ​​indicate the maximum transverse dimension of the capsule.

[0081] Capsule has maximum radial cross-sectional area.The area of ​​the radial cross-sectional area of ​​the cross section of the capsule relative to the smoking article containing the capsule can determine whether the restriction of the smoke flow or pressure drop caused by the capsule is within the acceptable limit.In some aspects, the capsule can be less than 50% of the radial cross-sectional area of ​​the cross section containing the capsule, for example, less than 45%, less than 40%, less than 35%, less than 30%, less than 25%, less than 20%, less than 15% or less than 10%.Alternatively, the maximum radial cross-sectional area of ​​the capsule can be less than 65%, less than 60% or less than 55% of the maximum radial cross-sectional area of ​​the cross section of the cigarette of the filter tip containing the parts.In conjunction with any upper limit, the cross-sectional area of ​​the capsule can be higher than 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40% or 45% of the filter tip or smoking article.

[0082] Alternatively, the maximum radial cross-sectional area of ​​the capsule expressed as the percentage of the radial cross-sectional area of ​​the cross section of the smoking article or filter containing the additive release component can be greater than 50%. The ratio can be less than 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% or 95%. Alternatively, the ratio can be greater than 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% or 95%.

[0083] The present invention may include filters and smoking articles, particularly cigarettes, wherein the maximum radial cross-sectional area of ​​the capsule, expressed as a percentage of the radial cross-sectional area of ​​the section containing the capsule, is within a range between any two of the above values.

[0084] This range may be from 15% to 50%, or in some aspects, from 20% to 35%, or from 30% to 45%, or from 25% to 40% or from 30% to 40%.

[0085] In particular, where the capsule has the above area relative to the cross section of the smoking article containing the capsule, the diameter of the cross section may be less than 8 mm, less than 7.5 mm, less than 7 mm or less than 6 mm. For example, the cross section of the smoking article containing the capsule may have a diameter from 5 mm to 6 mm, or from 6 mm to 7 mm, or from 5 mm to 7.5 mm. Alternatively, the diameter of this cross section of the smoking article may be greater than 8 mm.

[0086] The capsule may have a diameter less than 40 mm. 2 Less than 30mm 2 Less than 20mm 2 , less than 15 mm 2 , and in some aspects, less than 10 mm 2 , less than 8 mm2 , less than 6 mm 2 , less than 5 mm 2 In conjunction with any upper limit, the transverse cross-sectional area may be greater than 1 mm 2 , 2mm 2 , 3mm 2 , 4mm 2 , 5mm 2 or 6mm 2 . BRIEF DESCRIPTION OF THE DRAWINGS

[0087] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0088] Figure 1 is a schematic illustration of a smoking article having a filter with a tubular downstream filter section and an upstream filter section, the upstream filter section comprising an encapsulated additive in the form of frangible capsules;

[0089] Figure 2 is a schematic illustration of a smoking article having a filter comprising two filter sections.

[0090] Figure 3 is based on Figure 2 Schematic illustration of a smoking article comprising: a smoking article further comprising perforations.

[0091] Figure 4a is a schematic illustration of a filter comprising two filter sections, the filter sections also comprising perforations, and showing the position of the capsule.

[0092] Figure 4b The results of capsule testing in a filter comprising multiple sections are shown. DETAILED DESCRIPTION

[0093] As used herein, the term "smoking article" includes smokable products such as cigarettes, cigars and cigarillos, whether based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco or tobacco substitutes, and also includes heat-not-burn / tobacco heating products and aerosol-generating products, such as electronic cigarettes. For convenience, these will be referred to as "smoking articles" in this specification. The term "aerosol" covers smoke, such as tobacco smoke. Such smoking articles may be provided with a filter for the airflow drawn by the smoker.

[0094] The term "smoking article" includes cigarettes, cigars and cigarillos as well as roll-your-own and homemade products.

[0095] Smoking articles (such as cigarettes and their sizes) are often named according to the length of the cigarette: "regular" (usually in the range 68-75 mm, for example from about 68 mm to about 72 mm), "short" or "mini" (68 mm or less), "king size" (usually in the range 75 - 91 mm, for example from about 79 mm to about 88 mm), "long" or "super king size" (usually in the range 91-105 mm, for example from about 94 mm to about 101 mm) and "extra long" (usually in the range from about 110 mm to about 121 mm).

[0096] They are also named according to the circumference of the cigarette: "regular" (about 23-25 ​​mm), "wide" (greater than 25 mm), "thin" (about 22-23 mm), "semi-slim" (about 19-22 mm), "super-slim" (about 16-19 mm), and "micro-slim" (less than about 16 mm). Thus, a cigarette in the extra-large extra-slim format would, for example, have a length of about 83 mm and a circumference of about 17 mm. Cigarettes in the regular extra-large size format are preferred by many customers, i.e., have a circumference of from 23 to 25 mm and an overall length of from 75 to 91 mm.

[0097] Each format can be produced with filters of different lengths, with smaller filters typically used in formats of smaller length and circumference. Typically, the filter length will be from 15 mm (associated with the short, regular format) to 30 mm (associated with the extra-long, extra-fine format). The tipping paper will have a greater length than the filter, for example from 3 to 10 mm longer.

[0098] The smoking articles and filters described hereinafter may be manufactured to any of the above specifications.The smoking article may, for example, be from 70 to 100 mm in length and from 14 to 25 mm in circumference.

[0099] As used herein, the terms "upstream" and "downstream" are relative terms defined with respect to the direction of mainstream smoke (or other aerosol) drawn through a smoking article in use.

[0100] In this context, the distance measured from one capsule to another capsule is measured from the center of the first capsule to the center of the second capsule.

[0101] In this document, the unit "mm / Wg" refers to millimeters per water gauge (also known as mm H2O). In this document, these measurements are performed on individual filter segments.

[0102] Figure 1is a schematic illustration of a smoking article 1 which is generally cylindrical in shape and is of conventional oversized format, i.e. having a length in the range 75 - 91 mm and a circumference in the range 23 to 25 mm. The smoking article 1 comprises a tobacco rod 2 wrapped in a wrapper 3 (in this example, cigarette paper), the tobacco rod 2 being longitudinally connected to a filter 4 by a tipping material 5, which covers the filter 4 and partially covers the wrapper 3 so as to connect the filter 4 to the tobacco rod 2. The filter 4 comprises an absorbent material 7, which is provided with capsules 8a, 8b, 8c in an axial region proximate to the longitudinal axis of the filter 4. In this example, the axial region is a region centered on the axis 'a' of the smoking article 1 having a radius of about 3 mm. In alternative embodiments, the radius of the axial region may be anywhere from 1 mm to 4 mm or from 1 mm to 3 mm or about 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or 3.5 mm. The capsules 8a, 8b, 8c are sequentially spaced in the direction along the axis 'a'. The capsules 8a, 8b, 8c may be arranged only in the axial region of the filter 4, or may be arranged in the axial region with a greater concentration than in the non-axial region of the filter material of the filter 4. The filter is wrapped in a plug wrap 9.

[0103] The filter 4 is a cellulose acetate segment formed using continuous cellulose acetate fibers and a plasticizer. Capsules 8a, 8b, 8c are spherical and have a diameter of 2.8 mm, although capsules of other shapes and sizes can be used, and contain fluid additives that change the properties of the mainstream smoke passing through the smoking article 1. Capsules 8a-8c can be made using existing processes and mechanical devices and inserted into the filter 4. In this example, capsules 8a-8c contain menthol flavoring, although other fluid or granular additives can be contained in capsules 8a-8c. Consumers can rupture the capsules to release the fluid additives into the absorbent filter material 11.

[0104] The axis of the smoking article 1 about which the tobacco rod 2 and the filter 4 are aligned is Figure 1 Indicated by 'a'.

[0105] Figure 2 is based on Figure 1 Schematic illustration of a smoking article 1, which also includes a filter 4 having two filter sections 4a and 4b, the first filter section 4a being arranged farther from the mouth end of the filter than the second filter section 4b, wherein a first capsule 8c and a second capsule 8b are arranged in the first filter section, and a third capsule 8a is arranged in the second filter section.

[0106] Figure 3 is based on Figure 2Schematic illustration of a smoking article, which also includes perforations 10 to provide ventilation, wherein the perforations 10 are arranged in the area of ​​the first filter section 4a.

[0107] In use, the tobacco rod 2 of the smoking article 1 is lit by a consumer in the conventional manner and tobacco smoke is drawn from the burning coals of the tobacco rod 2 through the filter 4. When the consumer breaks one, two or three of the capsules 8a-8c before or during smoking the smoking article 1, the additive contained in the capsules (in this case, menthol) is released into the filter 4 and affects the characteristics of the smoke drawn through the filter.

[0108] A specific embodiment of the present invention has been described, although the present invention is not limited to such an embodiment.

[0109] Example 1: Multi-segment filter with ventilation

[0110] 1A: Perforations are formed at the boundaries between filter segments

[0111] A filter comprising two filter segments is manufactured, wherein a first filter segment having a length of 9 mm is arranged further from the mouth end (ME) of the filter than a second filter segment having a length of 18 mm. Thus, the boundary between the first and second filter segments is 18 mm from the mouth end of the filter, as shown in FIG. Figure 4a as shown in .

[0112] Three capsules are inserted, with the first capsule being disposed in the first filter section and the second and third capsules being disposed in the second filter section. The first capsule is disposed approximately 22 mm from the mouth end of the second filter section. The distance between the first capsule and the second capsule is approximately 8 mm, such that the second capsule is disposed approximately 14 mm from the mouth end of the second filter section. The distance between the second capsule and the third capsule is approximately 8 mm, such that the third capsule is disposed approximately 6 mm from the mouth end of the second filter section. As described above, the distance measured from one capsule to another is measured from the center of the first capsule to the center of the second capsule. This arrangement is shown in Figure 4a Using various pulse widths, perforations (not shown in the figure) were formed at the boundary of the first and second filter sections at a position 18 mm from the mouth end of the filter.

[0113] Forming the perforations using a Burghart Messtechnik CVB-1700 off-line laser:

[0114] Laser power: 120 W

[0115] Wavelength: 10.6 µm

[0116] Spot size: 0.18 mm

[0117] The vent tests were conducted using the sample numbers shown in Table 1 below.

[0118] Table 1: Sample No.

[0119]

[0120] The ventilation volume was measured using a Cerulean™ QTM5. The data obtained from the vent test are shown in Table 2 below.

[0121] Table 2: Percentage of vents for specified pulse widths and number of perforations.

[0122]

[0123] A sample of 40 filters was then tested using a tensile strength testing apparatus and standard protocol to establish failure (number of breaks). The results are shown in Table 3 below.

[0124] Table 3: Number of filter failures (breaks) out of a sample number of 40 in each case for filters having perforations formed between the border of the first filter section and the second filter section (18 mm from the mouth end of the filter).

[0125]

[0126] As shown by the results in Table 3, perforations formed at the boundary of the first and second filter sections resulted in an unacceptable degree of filter breakage during the filter stress test.

[0127] 1B: Perforations are formed in the area of ​​the first filter section

[0128] According to 1A above, the filter is manufactured and the capsule is inserted.

[0129] The perforations were formed using a Burghart Messtechnik CVB-1700 off-line laser as detailed in 1A above.

[0130] By using various pulse widths, a perforation was formed in the first filter section in which the first capsule was arranged at a position 22 mm from the mouth end of the filter. Thus, the perforation was located between the boundary of the first and second filter sections and the tobacco end of the first filter section; and above the center of the first capsule (not shown in the figure).

[0131] A sample of 40 filters was then tested: ventilation was measured using a Cerulean™ QTM5; failure (number of breaks) was established using a tensile strength test apparatus and standard protocol; and the filters were inspected for capsule damage. The results are provided in Table 4 below.

[0132] Table 4

[0133] Pulse Width(µs) Number of holes Ventilation% Design-appropriate vents Capsule damage Broken (out of 40) Acceptable 5 24 0.02 no none 13 no 25 24 11.40 no none 7 no 50 24 20.37 no none 6 no 100 24 30.98 yes none 4 yes 200 24 38.88 no All samples 5 no 400 24 51.79 no All samples 1 no

[0134] As shown in Table 4, filters having perforations formed between the boundary of the first and second filter sections and the tobacco end of the first filter section exhibited significantly reduced levels of filter breakage during stress testing, compared to filters having perforations at the boundary between the filter sections (as shown in Table 3).

[0135] As further shown in Table 4, a laser configured to form 24 perforations using a 100 µs pulse width was able to achieve the desired ventilation effect (between 25% and 35% ventilation) in addition to ensuring the structural integrity of the filter (low filter breakage) and without damaging the first capsule.

[0136] Example 2: Capsule detection and testing

[0137] 2A: Multi-segment filter capsule testing

[0138] A filter comprising multiple segments is manufactured and inserted into a capsule, e.g. Figure 4b as shown in .

[0139] The position of the capsule is detected using a detection system from Essentra™ (online detection system) or TEWS Elektronic™ (offline detection system).

[0140] Figure 4b The upper part of shows the capsule deviation from the target and the Cpk (a measure of process capability). These results demonstrate accurate detection of the capsule located within the filter.

[0141] 2B: Capsule resistance and filter coloration

[0142] A filter comprising a single filter segment was manufactured and inserted into the capsule. Details are provided in Table 5 below.

[0143] As can be seen from Table 5, in Examples 1-3, the capsule was positioned 4 mm from the first end of the filter segment. In Examples 4-6, the capsule was positioned 5 mm from the first end of the filter segment. Example 7 was the same as Example 3, except that the filter used 27 GSM plug wrap instead of high wet strength plug wrap (HWS).

[0144] The position of the capsule is detected using a detection system from Essentra™ (online detection system) or TEWS Elektronic™ (offline detection system).

[0145] The capsules within the filters were then crushed and the filters were visually inspected and visual measurements were taken every 5 minutes for 5 minutes to detect the presence of the capsule contents at the tobacco end of the filters. The results are listed in Table 5.

[0146] Table 5

[0147] Example Capsule tolerance M / C settings Capsule position from the first end Filter rod forming paper Visible mouth capsule (%) Filter color change after capsule damage (%) 1 1.5mm 4 HWS 0.9 1.8 2 1.75mm 4 HWS 2.1 10.9 3 2.0mm 4 HWS 3.9 7.3 4 2.0mm 5 HWS 2.4 8.2 5 1.5mm 5 HWS 7.0 24.5 6 1.75mm 5 HWS 1.3 31.8 7 2.0mm 4 27 GSM 3.7 35.5

[0148] The capsule tolerance making machine (M / C) setting is the rejection limit of the detection system used.

[0149] As shown in Table 5, Examples 1-3 showed significantly lower incidence of filter color change compared to Examples 4-6. In addition, it was shown that HWS plug wrap exhibited a lower incidence of filter color change than 27 GSM plug wrap.

[0150] In order to solve various problems and promote the development of the art, the entire content of the present disclosure shows various embodiments by way of illustration, in which the claimed invention can be practiced, and excellent delivery of smoke modification additives is provided. The advantages and features of the present disclosure are only representative samples of embodiments, and are not exhaustive and / or exclusive. They are only presented to help understand and teach the claimed features. It should be understood that the advantages, embodiments, examples, functions, features, structures and / or other aspects of the present disclosure should not be regarded as limitations on the disclosure defined by the claims or limitations on the equivalents of the claims, and other embodiments can be utilized, and modifications can be made without departing from the scope and / or spirit of the present disclosure. Various embodiments may appropriately include various combinations of disclosed elements, components, features, parts, steps, devices, etc., constituted by the various combinations or substantially constituted by the various combinations. In addition, the present disclosure includes other inventions that are not currently claimed but may be claimed in the future.

Claims

1. A filter for a smoking article or an aerosol generating product, comprising a filter material having a circumference of from 14 mm to 28 mm and having fibers of 3 dpf to 10 dpf and three breakable capsules having a diameter of from 2.0 mm to 6.0 mm and comprising an additive, the capsules being arranged in sequence in the direction along the longitudinal axis of the filter and surrounded by the filter material.

2. The filter according to claim 1, wherein the capsule contains a flavoring agent.

3. The filter according to claim 2, wherein the flavoring agent is a liquid.

4. The filter of claim 2 or 3, wherein the flavorant in one of the capsules is different from the flavorant in the other of the capsules.

5. The filter of claim 2 or 3, wherein the flavorant in each of the capsules is different from the flavorant in every other of the capsules.

6. A filter according to any one of claims 1 to 3, wherein the filter material has a total denier of from 12,000 to 40,000.

7. A filter according to any one of claims 1 to 3, wherein the filter has a pressure drop of from 85 mm / Wg to 100 mm / Wg before the capsule ruptures.

8. A filter according to any one of claims 1 to 3, wherein the circumference of the filter material is from 16 mm to 18 mm, from 19 mm to 22 mm or from 23 mm to 25 mm.

9. The filter according to any one of claims 1 to 3, wherein the capsule has a bursting strength of from 14N to 18N.

10. The filter according to any one of claims 1 to 3, wherein the capsule has a diameter of less than 3.5 mm or from 2.7 mm to 3.1 mm.

11. The filter according to any one of claims 1 to 3, wherein the capsule has a diameter of 3 mm.

12. The filter according to any one of claims 1 to 3, wherein the capsule is spherical and has a diameter of from 2.7 mm to 3.1 mm.

13. The filter according to any one of claims 1 to 3, wherein the capsule is spherical and has a diameter of from 2.8 mm to 3.0 mm.

14. A filter according to any one of claims 1 to 3, wherein the filter further comprises a first filter section and a second filter section, the first filter section being arranged farther from a mouth end of the filter than the second filter section, wherein a first capsule of the three capsules is arranged in the first filter section, and a second capsule and a third capsule of the three capsules are arranged in the second filter section.

15. The filter according to claim 14, wherein the length of the first filter segment is 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or 11 mm, and / or the length of the second filter segment is 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm or 22 mm.

16. The filter tip according to any one of claims 1 to 3, further comprising a first filter section and a second filter section, the first filter section being arranged farther from a mouth end of the filter tip than the second filter section, wherein the first and second capsules of the three capsules are arranged in the first filter section, and the third capsule is arranged in the second filter section.

17. A filter according to claim 16, wherein the length of the first filter segment is 16mm, 17mm, 18mm, 19mm, 20mm, 21mm or 22mm, and / or the length of the second filter segment is 6mm, 7mm, 8mm, 9mm, 10mm or 11mm.

18. The filter of claim 14, wherein the first filter segment comprises perforations arranged in a line along the circumference of the first filter segment, the line being perpendicular to the longitudinal axis of the first filter segment.

19. The filter of claim 18, wherein the perforations are disposed between a first end of the first filter section and the first capsule, the first end of the first filter section being disposed closer to the mouth end of the filter than the first capsule.

20. A filter according to claim 18, wherein the perforations are provided in an area of ​​the first filter section in which the first capsule is provided.

21. The filter of claim 18, wherein the perforations are formed using a laser, the laser being configured to form 24 individual perforations.

22. The filter according to any one of claims 1 to 3, wherein the filter is wrapped with high wet strength plug wrap.

23. The filter according to claim 14, wherein the first capsule is arranged to be closer to the first end of the first filter segment than the second end of the first filter segment, and the first end of the first filter segment is arranged to be closer to the mouth end of the filter than the second end of the first filter segment.

24. A filter according to any one of claims 1 to 3, wherein the filter material has a circumference from 16 mm to 19 mm, has fibers of 4.5 dpf to 8 dpf, and has a total denier from 15,000 to 25,000; and the capsule is spherical, has a diameter from 2.7 mm to 3.1 mm, and has a burst strength from 14N to 18N.

25. A filter according to any one of claims 1 to 3, wherein the filter material has a circumference of from 20 mm to 22 mm, has fibers of 4.0 dpf to 5.0 dpf, and has a total denier of from 30,000 to 35,000; and the capsule is spherical, has a diameter of from 2.7 mm to 3.1 mm, and has a burst strength of from 14N to 18N.

26. A filter according to any one of claims 1 to 3, wherein the filter material has a circumference of from 23 mm to 25 mm, has fibers of 3.0 dpf to 5.0 dpf, and has a total denier of from 35,000 to 40,000; and the capsule is spherical, has a diameter of from 2.7 mm to 3.1 mm, and has a burst strength of from 14N to 18N.

27. The filter according to any one of claims 1 to 3, wherein before the capsule is crushed, the filter has a resistance to draw (RTD) from 80 mm / Wg to 95 mm / Wg, and after the capsule is crushed, the filter has a resistance to draw (RTD) from 90 mm / Wg to 100 mm / Wg.

28. The filter according to any one of claims 1 to 3, wherein the filter material is cellulose acetate and the capsules are embedded in the filter material.

29. The filter according to claim 28, wherein the capsules are embedded in the filter material at predetermined positions and in a predetermined order; the capsules are spherical and have a diameter from 2.8 mm to 3.0 mm; and each capsule includes a different flavoring.

30. A filter according to any one of claims 1 to 3, wherein the capsule is arranged along a central longitudinal axis of the filter.

31. A smoking article or aerosol-generating product comprising a filter according to any preceding claim.

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