Rod shaped consumable with inner liquid or GEL immobilization layer and turbulent air management

Abstract

The invention relates to an aerosol-generating article. The article comprises a hollow tubular retention element comprising a retention material. The retention material comprises a plurality of micro-cavities. The micro-cavities are arranged on an inner surface of the hollow tubular retention element. The article comprises an aerosol-forming substrate.

Description

[0001] New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0002] -1-

[0003] ROD SHAPED CONSUMABLE WITH INNER LIQUID OR GEL IMMOBILIZATION LAYER AND TURBULENT AIR MANAGEMENT

[0004] The present invention relates to an aerosol-generating article. The present invention relates to an aerosol-generating device configured to be used with an aerosol-generating article. The present invention relates to an aerosol-generating system. The present invention relates to a method for manufacturing a hollow tubular retention element for an aerosolgenerating article. The present invention relates to a method for manufacturing an aerosolgenerating article.

[0005] It is known to provide an aerosol-generating device for generating an inhalable vapor. Such devices may heat aerosol-forming substrate to a temperature at which one or more components of the aerosol-forming substrate are volatilised without burning the aerosolforming substrate. Aerosol-forming substrate may be provided as part of an aerosol-generating article. The aerosol-generating article may have a rod shape for insertion of the aerosolgenerating article into a cavity, such as a heating chamber, of the aerosol-generating device. A heating element may be arranged in or around the heating chamber for heating the aerosolforming substrate once the aerosol-generating article is inserted into the heating chamber of the aerosol-generating device.

[0006] It would be desirable to provide an aerosol-generating article delivering an improved user experience. It would be desirable to provide an aerosol-generating article with improved air management. It would be desirable to provide an aerosol-generating article offering an improved control of the resistance-to-draw (RTD). It would be desirable to provide an aerosolgenerating article providing improved aerosol homogenization. It would be desirable to provide an aerosol-generating article reproducibly und predictably delivering an aerosol of satisfactory quality. It would be desirable to provide an aerosol-generating article providing an improved sustainability. It would be desirable to provide an aerosol-generating article which can be manufactured with reduced complexity and at reduced costs. It would be desirable to provide an aerosol-generating article offering a reduced risk of leakage.

[0007] According to an embodiment of the invention there is provided an aerosol-generating article. The aerosol-generating article comprises a hollow tubular retention element. The hollow tubular retention element comprises a retention material. The retention material comprises a plurality of micro-cavities. The micro-cavities are arranged on an inner surface of the hollow tubular retention element. The aerosol-generating article comprises an aerosolforming substrate.

[0008] According to an embodiment of the invention there is provided an aerosol-generating article. The aerosol-generating article may comprise a hollow tubular retention element. The hollow tubular retention element may comprise a retention material. The retention material may New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0009] -2- comprise a plurality of micro-cavities. The micro-cavities may be arranged on an inner surface of the hollow tubular retention element. The aerosol-generating article may comprise an aerosol-forming substrate.

[0010] The aerosol-generating article may deliver an improved user experience. The aerosolgenerating article may provide an improved air management. The aerosol-generating article may offer an improved control of the resistance-to-draw (RTD). The aerosol-generating article may provide improved aerosol homogenization. The aerosol-generating article may reproducibly und predictably deliver an aerosol of satisfactory quality. The aerosol-generating article may provide an improved sustainability. The aerosol-generating article may be manufactured with reduced complexity and at reduced costs. The aerosol-generating article may offer a reduced risk of leakage. The aerosol-generating article may provide a reduced risk of a migration of the aerosol-forming substrate. The aerosol-generating article may improve the aerosol quality. The aerosol-generating article may deliver an aerosol of consistent quality from puff to puff.

[0011] By providing the micro-cavities, a more uniform distribution of the aerosol-forming substrate may be achieved. By providing the micro-cavities, a more stable distribution of the aerosol-forming substrate on the inner surface of the hollow tubular retention element may be achieved. By providing the micro-cavities, a more uniform and more stable distribution of the aerosol-forming substrate may be achieved in varying ambient conditions. By providing the micro-cavities, a more uniform and more stable distribution of the aerosol-forming substrate may be maintained in varying ambient temperatures. By providing the micro-cavities, a more uniform and more stable distribution of the aerosol-forming substrate may be maintained in different orientations of the aerosol-generating article. By providing the micro-cavities, a more consistent aerosol quality may be achieved. By providing the micro-cavities, the reproducibility of the aerosol quality may be improved. By providing the micro-cavities, migration of the aerosol-forming substrate may be reduced or prevented.

[0012] A micro-cavity may be a cavity having a maximum diameter of less than between 1 millimetre and 4 millimetres, and preferably of less than between 2 millimetres and 3 millimetres. A micro-cavity may be a cavity having a maximum diameter of less than between 1 millimetre and 4 millimetres and a maximum depth of between 1 millimetre and 2 millimetres. A micro-cavity may be a cavity having a maximum cross-sectional area of between 3 square millimetres and 7 square millimetres. A micro-cavity may be a cavity having a maximum volume of between 3 cubic millimetres and 14 cubic millimetres.

[0013] The aerosol-generating article may comprise a distal end. The aerosol-generating article may comprise a proximal end. The aerosol-generating article may be configured such New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0014] -3- that the distal end of the aerosol-generating article and the proximal end of the aerosolgenerating article are fluidly connected.

[0015] The aerosol-generating article may comprise one or more wrappers. The one or more wrappers may circumscribe at least a portion of the aerosol-generating article. The one or more wrappers may circumscribe the entire aerosol-generating article. The one or more wrappers may circumscribe at least a portion of the hollow tubular retention element. The one or more wrappers may circumscribe the entire hollow tubular retention element.

[0016] The hollow tubular retention element may comprise a distal end. The hollow tubular retention element may comprise a proximal end. The hollow tubular retention element may comprise an air inlet. The air inlet of the hollow tubular retention element may be arranged at the distal end of the hollow tubular retention element. The hollow tubular retention element may comprise an air outlet. The air outlet of the hollow tubular retention element may be arranged at the proximal end of the hollow tubular retention element. The distal end of the hollow tubular retention element may be fluidly connected to the proximal end of the hollow tubular retention element. The air inlet of the hollow tubular retention element may be fluidly connected to the air outlet of the hollow tubular retention element.

[0017] The hollow tubular retention element may be arranged along a central longitudinal axis of the aerosol-generating article.

[0018] The hollow tubular retention element may be a hollow cylinder. The hollow tubular retention element may have a circular cross-section. The hollow tubular retention element may have a skewed circular cross-section. The hollow tubular retention element may have a rectangular cross-section. The hollow tubular retention element may have a polygonal crosssection. The hollow tubular retention element may be a hollow cylinder of circular crosssection.

[0019] The hollow tubular retention element may comprise an outer surface. The outer surface of the hollow tubular retention element may be essentially free from aerosol-forming substrate.

[0020] The hollow tubular retention element may be configured as a heating element.

[0021] The inner surface of the hollow tubular retention element may comprise a regular array of the micro-cavities. The inner surface of the hollow tubular retention element may be a textured surface.

[0022] The retention material may be impregnated with the aerosol-forming substrate. The retention material may be configured to retain aerosol-forming substrate. The retention material may be configured to immobilize the aerosol-forming substrate.

[0023] The micro-cavities may be arranged on at least a portion of the inner surface of the hollow tubular retention element. The micro-cavities may be arranged on more than 50 percent, preferably more than 70 percent, more preferably 90 percent, an even more preferably New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0024] -4- more than 95 percent of the inner surface of the hollow tubular retention element. Preferably, the micro-cavities are arranged on the entire inner surface of the hollow tubular retention element.

[0025] The retention material may comprise more than 10 micro-cavities, preferably more than 15 micro-cavities, and more preferably more than 20 micro-cavities.

[0026] All of the micro-cavities may be arranged on the inner surface of the hollow tubular retention element. All of micro-cavities may be arranged side-by-side on the inner surface of the hollow tubular retention element.

[0027] The micro-cavities may be identical.

[0028] The micro-cavities may be configured to abut each other. The micro-cavities may be configured to abut adjacent micro-cavities.

[0029] The micro-cavities may be circumscribed by one or more sidewalls. The one or more sidewalls may be provided in one of a hexagonal, regular hexagonal, square, triangular, equilateral triangular, regular polygonal or circular arrangement. The micro-cavities may be arranged in a regular pattern.

[0030] By arranging the micro-cavities in a regular pattern, the storage and the release of the aerosol-forming substrate may be improved.

[0031] One or more, preferably each of the micro-cavities may be circumscribed by one or more sidewalls. The one or more sidewalls may be provided in one of a hexagonal, regular hexagonal, square, triangular, equilateral triangular, regular polygonal or circular arrangement. The micro-cavities may be arranged in a regular pattern.

[0032] In a preferred embodiment, the one or more sidewalls are provided in one of a hexagonal or regular hexagonal arrangement. The micro-cavities are arranged in a honeycomb pattern

[0033] The micro-cavities may comprise one or more sidewalls. One or more, preferably each of the micro-cavities may comprise one or more sidewalls. The sidewalls may be integrally formed. The sidewalls of the micro-cavity may be configured to define the shape the microcavity. A cross-sectional shape of the micro-cavity may be defined by the sidewalls of the micro-cavity. The sidewalls of the micro-cavity may define the shape of the micro-cavity. The sidewalls of the micro-cavity may circumscribe the micro-cavity. The sidewalls of the microcavity may at least partially circumscribe the micro-cavity. The sidewalls of the micro-cavitiy may fully circumscribe the micro-cavity. One or more, preferably each of the micro-cavities may comprise a base. A volume of the micro-cavities may be defined by the base and the sidewalls of the micro-cavities. The sidewall of a micro-cavity may contact the sidewall of one or more adjacent micro-cavities. The sidewall of a micro-cavity may abut the sidewall of one or more adjacent micro-cavities. The sidewalls of the micro-cavities may be configured to New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0034] -5- define a depth of the micro-cavities. The sidewalls of the micro-cavities may be interconnected. The sidewalls of the micro-cavities may be configured to form a mesh. A sidewall of a first micro-cavity may serve as a wall of a second micro-cavity. The sidewalls may extend in a radial direction of the hollow tubular retention element.

[0035] The micro-cavities may be indentations in the surface of the retention material. One or more, preferably each of the micro-cavities may be an indentation in the surface of the retention material. One or more, preferably each of the micro-cavities may be an indentation in the inner surface of the hollow tubular retention element.

[0036] The micro-cavities may be configured to receive the aerosol-forming substrate. The micro-cavities may be configured to retain the aerosol-forming substrate. The micro-cavities may retain the aerosol-forming substrate. The micro-cavities may be configured to retain the aerosol-forming substrate by capillary forces. The micro-cavities may be dimensioned to retain the aerosol-forming substrate. The micro-cavities may be configured to immobilize the aerosolforming substrate. The micro-cavities may be configured to be at least partially filled with the aerosol-forming substrate. The micro-cavities may be at least partially filled with the aerosolforming substrate. The micro-cavities may be configured to filled with the aerosol-forming substrate.

[0037] The micro-cavities may comprise openings. One or more, preferably each of the microcavities may comprise an opening. The openings of the micro-cavities may be arranged facing the inside of the hollow tubular retention element. The openings of the micro-cavities may be configured to be fluidly connected with the inside of the hollow tubular retention element.

[0038] The micro-cavities may be three-dimensional. One or more, preferably each of the micro-cavities may have a diameter. One or more, preferably each of the micro-cavities may have a depth.

[0039] The micro-cavities may be tightly packed. The tight-packaging may enhance the amount of aerosol-forming substrate that can be retained in the retention material.

[0040] The hollow tubular retention element may be made from the retention material. The hollow tubular retention element may consist of the retention material. The hollow tubular retention element may be made from a sheet of the retention material which has been rolled up to form a hollow cylinder of circular cross-section.

[0041] The aerosol-forming substrate may be arranged in the micro-cavities. The microcavities may be configured to retain the aerosol-forming substrate. The aerosol-forming substrate may be one of a liquid and a gel

[0042] The aerosol-forming substrate may be deposited on the inner surface of the hollow tubular retention element. The aerosol-forming substrate may be distributed across the New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0043] -6- plurality of micro-cavities. The aerosol-forming substrate may be deposited in the microcavities.

[0044] At least a portion of the aerosol-forming substrate may be arranged in the microcavities. All of the aerosol-forming substrate may be arranged in the micro-cavities.

[0045] The retention material may be impregnated with the aerosol-forming substrate.

[0046] The hollow tubular retention element may comprise a longitudinal passageway. The micro-cavities may be arranged along the longitudinal passageway of the hollow tubular retention element. The micro-cavities may be configured to be fluidly connected with the longitudinal passageway.

[0047] The micro-cavities may be fluidly connected with the longitudinal passageway. Each of the micro-cavities may be configured to be fluidly connected with the longitudinal passageway.

[0048] The micro-cavities may be arranged along at least a portion of the longitudinal passageway of the hollow tubular retention element. The micro-cavities may be arranged along a total length of the longitudinal passageway of the hollow tubular retention element.

[0049] The micro-cavities may face the longitudinal passageway of the hollow tubular retention element. The longitudinal passageway may be arranged along a central longitudinal axis of the aerosol-generating article. The micro-cavities may face radially inward towards the longitudinal passageway.

[0050] The hollow tubular retention element may be configured such that air may flow through the hollow tubular retention element. The hollow tubular retention element may be configured such that air may flow through the longitudinal passageway.

[0051] One or more, preferably each of the micro-cavities may face the longitudinal passageway of the hollow tubular retention element. One or more, preferably each of the micro-cavities may be configured to be fluidly connected with the longitudinal passageway

[0052] The longitudinal passageway may comprise a distal end. The distal end of the longitudinal passageway may be arranged at the distal end of the hollow tubular retention element. The longitudinal passageway may comprise a proximal end. The proximal end of the longitudinal passageway may be arranged at the proximal end of the hollow tubular retention element. The longitudinal passageway may comprise an air inlet. The air inlet of the longitudinal passageway may be arranged at the distal end of the longitudinal passageway. The air inlet of the longitudinal passageway may be the air inlet of the hollow tubular retention element. The longitudinal passageway may comprise an air outlet. The air outlet of the longitudinal passageway may be arranged at the proximal end of the longitudinal passageway. The air outlet of the longitudinal passageway may be the air outlet of the hollow tubular retention element. The distal end of the longitudinal passageway may be fluidly connected to New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0053] -7- the proximal end of the longitudinal passageway. The air inlet of the longitudinal passageway may be fluidly connected to the air outlet of the longitudinal passageway.

[0054] The inner surface of the hollow tubular retention element may be configured to define the longitudinal passageway. The inner surface of the hollow tubular retention element may circumscribe at least a portion of the longitudinal passageway. The inner surface of the hollow tubular retention element may fully circumscribe the longitudinal passageway.

[0055] The openings of the micro-cavities may be arranged facing the longitudinal passageway of the hollow tubular retention element. The openings of the micro-cavities may be configured to fluidly connect the micro-cavities with the longitudinal passageway of the hollow tubular retention element. Volatized aerosol-forming substrate may flow from the microcavities into the longitudinal passageway via the openings of the micro-cavities.

[0056] The micro-cavities may have a maximum diameter of less than between 1 millimetre and 4 millimetres, and preferably of less than between 2 millimetres and 3 millimetres.

[0057] One or more, preferably each of the micro-cavities may have a maximum diameter of less than between 1 millimetre and 4 millimetres, and preferably of less than between 2 millimetres and 3 millimetres. Each of the micro-cavities may have the same diameter.

[0058] By providing micro-cavities having a maximum diameter of less than between 1 millimetre and 4 millimetres, and preferably of less than between 2 millimetres and 3 millimetres, the retention of the aerosol-forming substrate in the micro-cavities may be improved.

[0059] The micro-cavities may have a maximum cross-sectional area of between 3 square millimetres and 7 square millimetres.

[0060] One or more, preferably each of the micro-cavities may have a maximum cross- sectional area of between 3 square millimetres and 7 square millimetres. Each of the microcavities may have the same cross-sectional area.

[0061] By providing micro-cavities having a maximum cross-sectional area of between 3 square millimetres and 7 square millimetres, the retention of the aerosol-forming substrate in the micro-cavities may be improved.

[0062] The micro-cavities may have a minimum diameter of about 50 micrometers, preferably of about 100 micrometers, more preferably of about 300 micrometers.

[0063] The micro-cavities may have a depth of between 1 millimetre and 2 millimetres, and preferably of about 1 millimetre.

[0064] Micro-cavities having a depth of between 1 millimetre and 2 millimetres may improve the smoking experience. Micro-cavities having a depth of between 1 millimetre and 2 millimetres may store and deliver a relatively large total amount of aerosol-forming substrate. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0065] -8-

[0066] The micro-cavities may have a maximum depth of between 1 millimetre and 2 millimetres, and preferably of about 1 millimetre.

[0067] One or more, preferably each of the micro-cavities may have a depth of between 1 millimetre and 2 millimetres, and preferably of about 1 millimetre. One or more, preferably each of the micro-cavities may have a maximum depth of between 1 millimetre and 2 millimetres, and preferably of about 1 millimetre.

[0068] The micro-cavities may have a maximum volume of between 3 cubic millimetres and 14 cubic millimetres. One or more, preferably each of the micro-cavities may have a maximum volume of between 3 cubic millimetres and 14 cubic millimetres.

[0069] The micro-cavities may be arranged in a regular pattern.

[0070] The micro-cavities may be arranged in a uniform pattern. The micro-cavities may be arranged in a symmetrical pattern. The micro-cavities may be arranged in a regular array. The micro-cavities may be arranged in a regular pattern on the inner surface of the hollow tubular retention element.

[0071] A cross-section of the micro-cavities may be one of hexagonally-shaped, regular hexagonally-shaped, square-shaped, triangularly-shaped, equilateral triangularly-shaped, circularly-shaped and regular polygonally-shaped. A cross-section of one or more, preferably each of the micro-cavities may be one of hexagonally-shaped, regular hexagonally-shaped, square-shaped, triangularly-shaped, equilateral triangularly-shaped, circularly-shaped and regular polygonally-shaped. One or more, preferably each of the micro-cavities may have a hexagonal cross-section. One or more, preferably each of the micro-cavities may have a regular hexagonal cross-section. One or more, preferably each of the micro-cavities may have a square cross-section. One or more, preferably each of the micro-cavities may have a triangular cross-section. One or more, preferably each of the micro-cavities may have an equilateral triangular cross-section. One or more, preferably each of the micro-cavities may have a circular cross-section. One or more, preferably each of the micro-cavities may have a regular polygonal cross-section.

[0072] The diameter of the micro-cavity may be non-uniform. For example, the micro-cavity may be an elongated hexagon. The elongated hexagon may have at least a first diameter and a second diameter. The first diameter may be different to the second diameter. The first diameter may extend between two opposing edges of the elongate hexagon and crossing the centre of the elongate hexagon. The second diameter may extend between opposing vertices of the elongate hexagon and crossing the centre of the elongate hexagon. Preferably, the diameter of the micro-cavity is uniform. Preferably, the micro-cavities are uniformly-shaped.

[0073] The micro-cavities may be hexagonal micro-cavities. The micro-cavities may be regular hexagonal micro-cavities The micro-cavities may be square micro-cavities. The micro-cavities New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0074] -9- may be triangular micro-cavities. The micro-cavities may be equilateral triangular microcavities. The micro-cavities may be circular micro-cavities. The micro-cavities may be regular polygonal micro-cavities.

[0075] The micro-cavities may be symmetrical. The micro-cavities may be symmetrically- shaped. The micro-cavities may be regularly-shaped. The micro-cavities may have a symmetrical cross-section. The micro-cavities may be identical.

[0076] The micro-cavities may be circumscribed by the one or more sidewalls. The microcavities may be fully circumscribed by the one or more sidewalls. Each of the micro-cavities may be circumscribed by the one or more sidewalls. Each of the micro-cavities may be fully circumscribed by the one or more sidewalls. The one or more sidewalls may be provided in one of a hexagonal, regular hexagonal, square, triangular, equilateral triangular, regular polygonal or circular arrangement. The sidewalls may be integrally formed. The micro-cavities may be circumscribed by six sidewalls in a hexagonal arrangement. The micro-cavities may be circumscribed by six sidewalls in a hexagonal arrangement. One or more, preferably each of the micro-cavities may be circumscribed by six sidewalls in a hexagonal arrangement. One or more, preferably each of the micro-cavities may be circumscribed by six sidewalls in a regular hexagonal arrangement. The plurality of micro-cavities may be arranged such that the sidewalls are arranged in a honeycomb pattern. One or more, preferably each of the microcavities may be circumscribed by four sidewalls in a square arrangement. One or more, preferably each of the micro-cavities may be circumscribed by three sidewalls in a triangular arrangement. One or more, preferably each of the micro-cavities may be circumscribed by three sidewalls in an equilateral triangular arrangement. One or more, preferably each of the micro-cavities may be circumscribed by multiple sidewalls in a regular polygonal arrangement. At least one sidewall of each micro-cavity may correspond to a sidewall of one adjacent microcavity. At least one sidewall of each micro-cavity may abut a sidewall of one adjacent microcavity. One or more, preferably each of the micro-cavities may be circumscribed by a sidewall in a circular arrangement. The sidewall of each of the micro-cavities may abut the sidewall of at least three, preferably of six adjacent microcavities.

[0077] The one or more sidewalls may be provided in one of a hexagonal or regular hexagonal arrangement. The micro-cavities may be arranged in a honeycomb pattern.

[0078] The retention material may comprise a combination of micro-cavities having the one or more sidewalls provided in one of a hexagonal, regular hexagonal, square, triangular, equilateral triangular, regular polygonal or circular arrangement. The retention material may comprise micro-cavities of different shapes. Alternatively, the micro-cavities may be identical.

[0079] A cross-section of one or more, preferably each of the micro-cavities may be hexagonally-shaped. The micro-cavities may be arranged in a honeycomb pattern. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0080] -10-

[0081] The micro-cavities may be arranged hexagonally-packed. The micro-cavities may form a honeycomb pattern. The micro-cavities may be arranged in a close-packed hexagonal prism array. The micro-cavities may be arranged in a uniform hexagonal prism array. The microcavities may have hexagonally-shaped cross-sections and may be arranged in a honeycomb pattern. The micro-cavities may be arranged in a honeycomb pattern on the inner surface of the hollow tubular retention element.

[0082] The micro-cavities provided in a honeycomb pattern may improve the stability of the aerosol-generating article. The micro-cavities provided in a honeycomb pattern may enhance the retained amount of aerosol-forming substrate.

[0083] The retention material may be a multi-layered material. The retention material comprises a primary base layer, a retention layer and optionally a secondary base layer. The retention layer may comprise the micro-cavities. One or more of the primary base layer, the retention layer and the secondary base layer may be made from a paper-based material. The paper-based material may be paper or paperboard

[0084] The retention material may comprise a retention layer. The retention layer may comprise the micro-cavities. The retention layer may be arranged on the inner surface of the hollow tubular retention element.

[0085] The retention layer may form the inner surface of the hollow tubular retention element. The retention layer may at least partially circumscribe the longitudinal passageway of the hollow tubular retention element. The retention layer may fully circumscribe the longitudinal passageway of the hollow tubular retention element. The retention layer may be fluidly connected to the longitudinal passageway of the hollow tubular retention element. The retention layer may be arranged along the longitudinal passageway.

[0086] The retention layer may consist of a retention layer material. The retention layer may be made from a paper-based material. The paper-based material may be paper. The retention layer may be made from paper. The retention layer material may have a basis weight of between 60 grams per square metre (gsm) and 160 grams per square metre, preferably of between 80 grams per square metre and 140 grams per square metre.

[0087] The retention material may be a multi-layered material. The retention material may comprise a primary base layer and a retention layer. The retention layer may comprise the micro-cavities. The retention material may consist of a primary base layer and a retention layer.

[0088] The retention material may be a laminate material.

[0089] The primary base layer may be arranged on the outer surface of the hollow tubular retention element. The primary base layer may form the outer surface of the hollow tubular retention element. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0090] -11-

[0091] The primary base layer may consist of a primary base layer material. The retention layer may consist of a retention layer material.

[0092] The retention material may be configured as a susceptor member. The retention layer may be configured as a susceptor member.

[0093] The retention material may comprise a susceptor material. The retention layer may comprise the susceptor material. The retention layer may consist of the susceptor material. The retention layer may be configured to heat the aerosol-forming substrate. The retention layer may be configured to volatize the aerosol-forming substrate.

[0094] By providing the retention material configured as a susceptor member, the efficiency of heating the aerosol-forming substrate may be improved. By providing the retention layer configured as a susceptor member, the efficiency of heating the aerosol-forming substrate may be improved.

[0095] The retention layer may be made from a material selected from the group consisting of carbon, graphite, silicon carbide, molybdenum, stainless steel and any combination thereof.

[0096] The retention layer may be made from a ferromagnetic material.

[0097] The primary base layer may be made from a paper-based material. The paper-based material may be selected from the group consisting of paper and paperboard.

[0098] The retention material may be a multi-layered material. The retention material may comprise a primary base layer, a secondary base layer and a retention layer. The retention layer may comprise the micro-cavities. The retention material may consist of a primary base layer, a secondary base layer and a retention layer.

[0099] The primary base layer may be arranged on the outer surface of the hollow tubular retention element. The primary base layer may form the outer surface of the hollow tubular retention element.

[0100] The multi-layered material may improve the structural integrity of the aerosolgenerating article. The multilayered material may offer improved protection of internal components of the aerosol-generating article.

[0101] The primary base layer may consist of a primary base layer material. The secondary base layer may consist of a secondary base layer material. The retention layer may consist of a retention layer material.

[0102] One or both of the primary base layer and the secondary base layer may be made from a paper-based material. The paper-based material may be selected from the group consisting of paper and paperboard.

[0103] The secondary base layer may be made from a secondary base layer material. The primary base layer may be made from a primary base layer material. The retention layer may be made from a retention layer material. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0104] -12-

[0105] One or both of the primary base layer material and the secondary base layer material may be a paper-based material. One or both of the primary base layer material and the secondary base layer material may have a basis weight of between 20 grams per square metre and 200 grams per square metre, preferably of between 40 grams per square metre and 100 grams per square metre.

[0106] The primary base layer may be configured to be porous. The secondary base layer may be configured to be non-porous.

[0107] The retention material may be made from a paper-based material. The paper-based material may be paper.

[0108] By providing the paper-based retention material, the environmental impact of the aerosol-generating article may be decreased. By providing the paper-based retention material, the sustainability of the aerosol-generating article may be improved. By providing the paperbased retention material, the recyclability of the aerosol-generating article may be improved.

[0109] The hollow tubular retention element may have a length of between 15 millimetres and 45 millimetres, preferably of between 20 millimetres and 40 millimetres, and more preferably of between 25 millimetres and 35 millimetres.

[0110] The hollow tubular retention element may have a total length of between 15 millimetres and 45 millimetres, preferably of between 20 millimetres and 40 millimetres, and more preferably of between 25 millimetres and 35 millimetres.

[0111] The hollow tubular retention element may have an outer diameter of between 4.0 millimetres and 9.0 millimetres, preferably of between 6.0 millimetres and 8.0 millimetres, and more preferably of between 6.5 millimetres and 7.5 millimetres.

[0112] The hollow tubular retention element may have an inner diameter of between 3.5 millimetres and 7.5 millimetres, preferably of between 4.0 millimetres and 7.0 millimetres, and more preferably of between 5.0 millimetres and 6.0 millimetres.

[0113] The aerosol-generating article may comprise an airflow-directing element. The airflowdirecting element may be arranged at a distal end of the hollow tubular retention element. The airflow-directing element may comprise a longitudinal airflow conduit. A diameter of the airflow conduit may increase in a proximal direction.

[0114] The airflow-directing element may be arranged along a central longitudinal axis of the aerosol-generating article. The airflow conduit of the airflow-directing element may be arranged along a central longitudinal axis of the aerosol-generating article.

[0115] The airflow-directing element may comprise a distal end. The distal end of the airflowdirecting element may be arranged at the distal end of the aerosol-generating article. The airflow-directing element may comprise an air inlet. The air inlet of the airflow-directing element may be arranged at the distal end of the airflow-directing element. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0116] -13-

[0117] The airflow-directing element may comprise a proximal end. The airflow- di recti ng element may comprise an air outlet. The air outlet may be arranged at the proximal end of the airflow-directing element.

[0118] The airflow-directing element may abut the distal end of the hollow tubular retention element. The proximal end of the airflow-directing element may abut the distal end of the hollow tubular retention element. The air outlet of the airflow-directing element may abut the air inlet of the hollow tubular retention element. The air outlet of the airflow-directing element may abut the air inlet of the longitudinal passageway of the hollow tubular retention element. The airflow conduit of the airflow-directing element may abut the longitudinal passageway of the hollow tubular retention element. A diameter of the air outlet of the airflow-directing element may be correspond to a diameter of the air inlet of the hollow tubular retention element.

[0119] The airflow- di recti ng element may be fluidly connected to the hollow tubular retention element. The air outlet of the airflow-directing element may be fluidly connected to the air inlet of the hollow tubular retention element. The airflow conduit of the airflow-directing element may be fluidly connected to the hollow tubular retention element. The airflow conduit of the airflowdirecting element may be fluidly connected to the longitudinal passageway of the hollow tubular retention element.

[0120] A diameter of the air outlet of the airflow-directing element may be larger than a diameter of the air inlet of the airflow-directing element. A diameter of the airflow conduit of the airflow-directing element may increase towards the hollow tubular retention element.

[0121] The airflow-directing element may provide a Venturi effect. The airflow-directing element may accelerate the airflow. The airflow-directing element may accelerate the airflow into the hollow tubular retention element. The airflow-directing element may improve the control of the airflow. The airflow-directing element may provide a turbulent airflow in the hollow tubular retention element. The mixing of the airflow with volatized aerosol-forming substrate may be improved. The homogeneity of the aerosol may be improved. The volatized aerosolforming substrate may be more efficiently released from the micro-cavities. The airflowdirecting element may improve control of the resistance-to-draw. The airflow- di recti ng element may improve the structural integrity of the aerosol-generating article. The airflow-directing element may reduce the risk of contamination of the aerosol-generating article. The control of the initial air intake may be improved.

[0122] The diameter of the airflow conduit of the airflow-directing element may gradually increase in a proximal direction.

[0123] The diameter of the airflow conduit of the airflow-directing element may gradually increase towards the hollow tubular retention element. The diameter of the airflow conduit of the airflow-directing element may continuously increase in a proximal direction. The diameter New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0124] -14- of the airflow conduit of the airflow-directing element may continuously increase towards the hollow tubular retention element.

[0125] The airflow-directing element may be made from a paper-based material.

[0126] The airflow conduit of the airflow-directing element may comprise a constricted portion. The constricted portion of the airflow-directing element may be arranged at the distal end of the aerosol-generating article. The constricted portion of the airflow-directing element may comprise the portion of the airflow conduit of the airflow- di recti ng element having a minimum diameter. A minimum diameter of the airflow conduit of the airflow-directing element may be about 1 millimetre. The constricted portion of the airflow-directing element may correspond to the air inlet of the airflow- di recti ng element.

[0127] The airflow conduit of the airflow-directing element may be conically shaped. The airflow conduit of the airflow-directing element may be trumpet-shaped.

[0128] A diameter of the air inlet of the airflow-directing element may be about 1 millimetre.

[0129] The airflow-directing element may have a length of between 2 millimetres and 8 millimetres, preferably of between 3 millimetres and 7 millimetres, and more preferably of between 4 millimetres and 6 millimetres.

[0130] The airflow-directing element may have a total length of between 2 millimetres and 8 millimetres, preferably of between 3 millimetres and 7 millimetres, and more preferably of between 4 millimetres and 6 millimetres.

[0131] The airflow-directing element may a hollow cylindrical shape. The airflow- di recti ng element may have a circular cross-section. The airflow-directing element may have a rectangular cross-section. The airflow-directing element may have a polygonal cross-section.

[0132] The aerosol-generating article may comprise a Venturi element. The Venturi element may be arranged at a proximal end of the hollow tubular retention element. The Venturi element may comprise a longitudinal airflow conduit. The longitudinal airflow conduit of the Venturi element may comprise a constricted portion.

[0133] The airflow conduit of the Venturi element may be symmetrically shaped with regard to a central cross-sectional plane of the Venturi element.

[0134] The Venturi element may have a distal end. The Venturi element may have an air inlet. The air inlet of the Venturi element may be arranged at the distal end of the Venturi element. The Venturi element may have a proximal end. The Venturi element may have an air outlet. The air outlet of the Venturi element may be arranged at the proximal end of the Venturi element.

[0135] The Venturi element may abut the hollow tubular retention element. The Venturi element may abut the proximal end of the hollow tubular retention element. The distal end of the Venturi element may abut the proximal end of the hollow tubular retention element. The air New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0136] -15- inlet of the Venturi element may abut the air outlet of the hollow tubular retention element. The airflow conduit of the Venturi element may abut the longitudinal passageway of the hollow tubular retention element. A diameter of the air inlet of the Venturi element may correspond to a diameter of the air outlet of the hollow tubular retention element.

[0137] The Venturi element may be fluidly connected to the hollow tubular retention element. The air inlet of the Venturi element may be fluidly connected to the air outlet of the hollow tubular retention element. The airflow conduit of the Venturi element may be fluidly connected to the longitudinal passageway of the hollow tubular retention element.

[0138] The Venturi element may be arranged along a central longitudinal axis of the aerosolgenerating article. The airflow conduit of the Venturi element may be arranged along a central longitudinal axis of the aerosol-generating article. The airflow-directing element, the hollow tubular retention element and the Venturi element may be arranged along a central longitudinal axis of the aerosol-generating article. The airflow conduit of the airflow-directing element, the longitudinal passageway of the hollow tubular retention element and the airflow conduit of the Venturi element may be arranged along a central longitudinal axis of the aerosol-generating article.

[0139] The airflow-directing element may abut a first end face of the hollow tubular retention element. The Venturi element may abut a second end phase of the hollow tubular retention element. The first end face of the hollow tubular retention element may be arranged opposite to the second end face of the hollow tubular retention element. The first end face of the hollow tubular retention element may be a distal end face of the hollow tubular retention element. The second end face of the hollow tubular retention element may be a proximal end face of the hollow tubular retention element. The airflow-directing element may abut the distal end face of the hollow tubular retention element. The Venturi element may abut the proximal end face of the hollow tubular retention element. The Venturi element may abut an end of the hollow tubular retention element facing towards the mouth end of the aerosol-generating article. The airflow-directing element may abut an end of the hollow tubular retention element opposite to the end of the hollow tubular retention element which the Venturi element abuts.

[0140] The Venturi element may a hollow cylindrical shape. The Venturi element may have a circular cross-section. The Venturi element may have a rectangular cross-section. The Venturi element may have a polygonal cross-section.

[0141] The aerosol-generating article may comprise the airflow-directing element, the hollow tubular retention element, the Venturi element and one or more wrappers. The aerosolgenerating article may consist of the airflow-directing element, the hollow tubular retention element, the Venturi element and one or more wrappers. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0142] -16-

[0143] The wrappers described herein may be fixed around the corresponding wrapped component by an adhesive. The adhesive may be applied at one edge of the wrapper. The wrapper may be wrapped around the component. An opposing edge of the wrapper may overlap with the edge of the wrapper comprising the adhesive. An opposing edge of the wrapper may at least partially cover the edge of the wrapper comprising the adhesive. The adhesive may attach the two edges together. Alternatively, the adhesive may be applied to the edge of the wrapper at least partially covering and opposing edge of the wrapper.

[0144] The aerosol-generating article may comprise a first wrapper. The aerosol-generating article may comprise second wrapper. The aerosol-generating article may comprise third wrapper.

[0145] The Venturi element may be a mouthpiece of the aerosol-generating article. The airflow-directing element may be arranged at a distal end of the aerosol-generating article. The Venturi element may be arranged at a proximal end of the aerosol-generating article. The hollow tubular retention element may be arranged between the airflow-directing element and the Venturi element.

[0146] The Venturi element may be arranged at a mouth end of the aerosol-generating article. The airflow-directing element may be arranged at end of the aerosol-generating article opposite to the mouth end of the aerosol-generating article.

[0147] The Venturi element may improve control of the resistance-to-draw. The Venturi element may accelerate the airflow. The Venturi element may improve the homogeneity of the aerosol. The Venturi element may improve the structural integrity of the aerosol-generating article. The Venturi element may reduce the risk of contamination of the aerosol-generating article. The Venturi element may provide a turbulent airflow. The Venturi element may improve the expansion of the aerosol. The Venturi element may improve aerosol quality

[0148] The airflow conduit of the airflow-directing element, the longitudinal passageway of the hollow tubular retention element and the airflow conduit of the Venturi element may form an airflow channel.

[0149] The constricted portion of the airflow conduit of the Venturi element may comprise a portion of minimum diameter of the airflow conduit of the Venturi element.

[0150] The airflow conduit of the Venturi element may comprise an inlet portion and an outlet portion. The inlet portion may be arranged at a distal end of the Venturi element. The outlet portion may be arranged at a proximal end of the Venturi element. A diameter of the airflow conduit of the inlet portion may decrease in a proximal direction. A diameter of the airflow conduit of the outlet portion may increase in a proximal direction.

[0151] A diameter of the airflow conduit of the inlet portion may decrease towards the mouth end of the aerosol-generating article. A diameter of the airflow conduit of the outlet portion may New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0152] -17- increase towards the mouth end of the aerosol-generating article. A diameter of the airflow conduit of the inlet portion may decrease towards the constricted portion of the airflow conduit of the Venturi element. A diameter of the airflow conduit of the outlet portion may decrease towards the constricted portion of the airflow conduit of the Venturi element.

[0153] The inlet portion of the airflow conduit of the Venturi element may abut the outlet portion of the airflow conduit of the Venturi element. The inlet portion of the airflow conduit of the Venturi element may be fluidly connected to the outlet portion of the airflow conduit of the Venturi element. The minimum diameter of the airflow conduit of the Venturi element may be arranged at the plane of abutment between the inlet portion and the outlet portion. The constricted portion of the airflow conduit may correspond to the portion of the airflow conduit arranged at the plane of abutment between the inlet portion and the outlet portion. The minimum diameter of the airflow conduit of the Venturi element may be part of the constricted portion of the airflow conduit of the Venturi element.

[0154] The inlet portion may comprise the air inlet of the Venturi element. The outlet portion may comprise the air outlet of the Venturi element.

[0155] The Venturi element may be made from a paper-based material. The Venturi element may be made from a lightweight material. The Venturi element may be made from a material of low specific weight.

[0156] A diameter of the airflow conduit of the inlet portion may gradually decrease in a proximal direction. A diameter of the airflow conduit of the outlet portion may gradually increase in a proximal direction.

[0157] A diameter of the airflow conduit of the inlet portion may gradually decrease towards the mouth end of the aerosol-generating article. A diameter of the airflow conduit of the inlet portion may continuously decrease in a proximal direction. A diameter of the airflow conduit of the outlet portion may gradually increase towards the mouth end of the aerosol-generating article. A diameter of the airflow conduit of the outlet portion may continuously increase in a proximal direction.

[0158] The Venturi element may have a length of between 4 millimetres and 16 millimetres, preferably of between 6 millimetres and 14 millimetres, and more preferably of between 8 millimetres and 12 millimetres.

[0159] The Venturi element may have a total length of between 4 millimetres and 16 millimetres, preferably of between 6 millimetres and 14 millimetres, and more preferably of between 8 millimetres and 12 millimetres.

[0160] The outlet portion of the Venturi element may have a length of between 8 millimetres and 12 millimetres, preferably of between 9 millimetres and 11 millimetres, and more preferably of between 9 millimetres and 10 millimetres. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0161] -18-

[0162] The outlet portion of the Venturi element may have a total length of between 8 millimetres and 12 millimetres, preferably of between 9 millimetres and 11 millimetres, and more preferably of between 9 millimetres and 10 millimetres.

[0163] A minimum diameter of airflow conduit of one or both of the airflow-directing element and the Venturi element may be of between 0.6 millimetres and 1.2 millimetres, preferably of between 0.7 millimetres and 1.1 millimetres, more preferably of between 0.8 millimetres and 1 millimetre, and even more preferably of between 0.85 millimetres and 0.95 millimetres.

[0164] The airflow conduit of one or both of the airflow-directing element and the Vetnuri element may be configured to accelerate the airflow by a factor of about 46.

[0165] One or both of the airflow- di recti ng element and the Venturi element may provide a resistance-to-draw of between 40 millimeters of water column (mmWC) and 90 millimeters of water column, preferably of between 50 millimeters of water column and 60 millimeters of water column. The resistance-to-draw of the aerosol-generating article may correspond to the resistance-to-draw provided by one or both of the airflow-directing element and the Venturi element.

[0166] One or both of the airflow-directing element and the Venturi element may be made from one of paperboard, paper pulp, cotton, and non-woven cellulose acetate.

[0167] The environmental impact of the aerosol-generating article may be decreased. The sustainability of the aerosol-generating article may be improved. The recyclability of the aerosol-generating article may be improved.

[0168] One or more of the paperboard, paper pulp, cotton, and non-woven cellulose acetate may have a basis weight of between 100 grams per square metre and 700 grams per square metre, preferably of between 200 grams per square metre and 400 grams per square metre.

[0169] The aerosol-generating article may comprise a plurality of ventilation perforations. The ventilation perforations may be configured to be fluidly connected with the longitudinal airflow conduit of the Venturi element. The ventilation perforations may be arranged radially around the constricted portion of the longitudinal airflow conduit of the Venturi element. The ventilation perforations may be fluidly connected with the longitudinal airflow conduit of the Venturi element.

[0170] The ventilation perforations may improve the aerosol yield. The ventilation perforations may improve nucleation of the aerosol-forming substrate. The ventilation perforations may improve cooling of the airflow.

[0171] The ventilation perforations may be arranged radially around a section of the airflow conduit of the Venturi element of minimum diameter. The ventilation perforations may be arranged radially around the constricted section of the airflow conduit of the Venturi element. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0172] -19-

[0173] By providing the perforations radially around the constricted section of the airflow conduit of the Venturi element, the aerosol yield may be improved. By providing the perforations radially around the constricted section of the airflow conduit of the Venturi element, nucleation of the aerosol-forming substrate may be improved.

[0174] At least a portion of the airflow-directing element, the hollow tubular retention element and the Venturi element may be circumscribed by a first wrapper. At least a portion of the airflow-directing element, the hollow tubular retention element and the Venturi element may be circumscribed by a first paper wrapper.

[0175] At least a portion of the hollow tubular retention element and the Venturi element may be circumscribed by a second wrapper. At least a portion of the second wrapper may be arranged radially outward of the first wrapper. At least a portion of the hollow tubular retention element and the Venturi element may be circumscribed by a second paper wrapper.

[0176] The airflow-directing element, the hollow tubular retention element and the Venturi element may be circumscribed by the first wrapper.

[0177] The first wrapper may improve the stability of the aerosol-generating article. The second wrapper may improve the stability of the aerosol-generating article.

[0178] The aerosol-generating article may comprise a third wrapper. The third wrapper may circumscribe the aerosol-generating article. The third wrapper may circumscribe the aerosolgenerating article. The third wrapper may circumscribe one or more of the airflow-directing element, the hollow tubular retention element and the Venturi element. The third wrapper may circumscribe one or more of the airflow-directing element, the hollow tubular retention element and the Venturi element. The third wrapper may circumscribe further components of the aerosol-generating article. The third wrapper may circumscribe further components of the aerosol-generating article. The third wrapper may hold together different components of the aerosol-generating article in a desired arrangement.

[0179] One or more of the first wrapper, second wrapper and third wrapper may improve the stability of the aerosol-generating article. One or more of the first wrapper, second wrapper and third wrapper may improve the alignment of the airflow-directing element, the hollow tubular retention element and the Venturi element.

[0180] One or more of the first wrapper, the second wrapper and the third wrapper may comprise the ventilation perforations.

[0181] The ventilation perforations may be arranged such that a consumer drawing on the Venturi element does not cover the ventilation perforations.

[0182] One or more of the first wrapper, the second wrapper and the third wrapper may have a width of between 10 millimetres and 25 millimetres, preferably of between 13 millimetres and 22 millimetres, and mor preferably of between 17 millimetres and 20 millimetres. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0183] -20-

[0184] The first wrapper may have a length of between 20 millimetres and 100 millimetres, preferably 30 millimetres and 70 millimetres, and more preferably 35 millimetres and 55 millimetres. Alternatively the first wrapper may have a length of between 20 millimetres and 60 millimetres, preferably of between 30 millimetres and 50 millimetres, and more preferably of between 35 millimetres and 45 millimetres.

[0185] The second wrapper may a length of between 4 millimetres and 16 millimetres, preferably of between 6 millimetres and 14 millimetres, more preferably of between 8 millimetres and 12 millimetres.

[0186] The first wrapper may consist a of a first wrapper material. The second wrapper may consist a of a second wrapper material. The third wrapper may consist a of a third wrapper material.

[0187] The width of the first, second and third wrapper may refer to a width of a sheet of the wrapper material which is used to wrap one or more components of the aerosol-generating article as described herein. The width of one or more of the first wrapper, the second wrapper and the third wrapper may be slightly larger than the circumference of the aerosol-generating article.

[0188] One or more of the first wrapper, second wrapper and third wrapper may have a basis weight of between 20 grams per square metre and 200 grams per square metre, preferably of between 40 grams per square metre and 100 grams per square metre. One or mor of the first wrapper, second wrapper and third wrapper may be a paper wrapper.

[0189] The aerosol-generating article may be rod-shaped.

[0190] The aerosol-forming substrate may be one of a liquid and a gel.

[0191] The aerosol-forming substrate may have a density of between 1.1 grams per millilitre (g / ml) and 2 grams per millilitre, preferably of between 1.2 grams per millilitre and 1.6 grams per millilitre. The density may be determined at atmospheric pressure. The density may be determined at about 20 degrees Celsius.

[0192] The aerosol-forming substrate may comprise one or more of an aerosol former, a flavouring material, nicotine and a gelling agent. The aerosol former may be selected from the group consisting of glycerol and propylene glycerol. Preferably, the aerosol former is glycerol.

[0193] According to an embodiment of the invention there is provided a method for manufacturing a hollow tubular retention element for an aerosol-generating article comprising the following steps: a) forming a sheet of a retention material comprising a plurality of micro-cavities; b) applying an aerosol-forming substrate to the sheet of the retention material; and c) forming the sheet of the retention material into a hollow tube such that the microcavities are arranged on an inner surface of the hollow tube New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0194] -21-

[0195] According to an embodiment of the invention there is provided a method for manufacturing a hollow tubular retention element for an aerosol-generating article which may comprise the following steps: a) forming a sheet of a retention material comprising a plurality of micro-cavities; b) applying an aerosol-forming substrate to the sheet of the retention material; and c) forming the sheet of the retention material into a hollow tube such that the microcavities are arranged on an inner surface of the hollow tube

[0196] In step a), a continuous sheet of a retention layer material comprising the plurality of micro-cavities and a continuous sheet of a primary base layer material may be supplied from separate bobbins. The continuous sheet of the retention layer material and the continuous sheet of the primary base layer material may be bonded to each other in a planar manner by an adhesive.

[0197] In step a), a continuous sheet of a retention layer material comprising the plurality of micro-cavities and a continuous sheet of a primary base layer material may be supplied from separate bobbins. Subsequently, the continuous sheet of the retention layer material and the continuous sheet of the primary base layer material may be bonded to each other in a planar manner by an adhesive.

[0198] In step a), the adhesive may be applied to the sheet of primary base layer material.

[0199] In step a), a width of the continuous sheet of the primary base layer material may be larger than a width of the continuous sheet of the retention layer material. The continuous sheet of the primary base layer material and the continuous sheet of the retention layer material may be bonded to each other such that an uncovered lateral strip of the continuous sheet of the primary base layer material is formed.

[0200] The continuous sheet of the primary base layer material and the continuous sheet of the retention layer material may be bonded to each other such that a lateral overhang of the continuous sheet of the primary base layer material is formed. The continuous sheet of the primary base layer material and the continuous sheet of the retention layer material may be bonded to each other such that an uncovered edge of the continuous sheet of the primary base layer material is formed.

[0201] In step c), an adhesive may be applied to the uncovered lateral strip of the continuous sheet of the primary base layer material. The sheet of the retention material may be rolled into the hollow tube. The uncovered lateral strip of the continuous sheet of the primary base layer may at least partially overlap with an opposing edge of the sheet of the retention material such that the hollow tube is held in shape by the adhesive applied to the uncovered strip of the continuous sheet of the primary base layer material. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0202] -22-

[0203] In step a), a continuous sheet of a retention layer material comprising the plurality of micro-cavities, a continuous sheet of a primary base layer material and a continuous sheet of a secondary base layer material may be supplied from separate bobbins. The continuous sheet of the retention layer material and the continuous sheet of the secondary base layer material may be bonded to each other in a planar manner by an adhesive. The continuous sheet of the secondary base layer material and the continuous sheet of the primary base layer material may be bonded to each other in a planar manner by an adhesive.

[0204] The adhesive bonding the retention layer material and the secondary base layer material together may be applied on a surface of the secondary base layer material. The adhesive bonding the secondary base layer material and the primary base layer material together may be applied on a surface of the primary base layer material.

[0205] A width of the continuous sheet of the primary base layer material may correspond to a width of the continuous sheet of secondary base layer material. The width of the continuous sheet of the secondary base layer material may be larger than a width of the continuous sheet of the retention layer material. The continuous sheet of the primary base layer material and the continuous sheet of the secondary base layer material may be bonded to each other such that an uncovered lateral strip of the continuous sheet of the primary base layer material is formed. The continuous sheet of the secondary base layer material and the continuous sheet of the retention layer material may be bonded to each other such that a first uncovered lateral strip of the continuous sheet of the secondary base layer material and a second uncovered lateral strip of the continuous sheet of the secondary base layer material is formed. The first uncovered lateral strip of the continuous sheet of the secondary base layer material and the second uncovered lateral strip of the continuous sheet of the secondary base layer material maybe arranged opposite to each other.

[0206] The continuous sheet of the primary base layer material and the continuous sheet of the secondary base layer material may be bonded to each other such that a lateral overhang of the continuous sheet of the primary base layer material is formed. The continuous sheet of the secondary base layer material and the continuous sheet of the retention layer material may be bonded to each other such that a first and a second lateral overhang of the continuous sheet of the secondary base layer material is formed.

[0207] The continuous sheet of the primary base layer material and the continuous sheet of the secondary base layer material may be bonded to each other such that an uncovered edge of the continuous sheet of the primary base layer material is formed. The continuous sheet of the secondary base layer material and the continuous sheet of the retention layer material may be bonded to each other such that a first and a second uncovered edge of the continuous sheet of the secondary base layer material is formed. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0208] -23-

[0209] In step c), an adhesive may be applied to the uncovered lateral strip of the continuous sheet of the primary base layer material. An adhesive may be applied to one or both of the first and second uncovered lateral strip of the continuous sheet of the secondary base layer material. The sheet of the retention material may be rolled into the hollow tube. The uncovered lateral strip of the continuous sheet of the primary base layer material may at least partially overlap with an opposing edge of the continuous sheet of the primary base layer material. The first uncovered lateral strip of the continuous sheet of the secondary base layer material may at least partially overlap with the second uncovered lateral strip of the continuous sheet of the secondary base layer material. The hollow tube may be held in shape by the adhesive applied to the uncovered lateral strips of the continuous sheets of the primary base layer material and the secondary base layer material.

[0210] In step b), the sheet of the retention material may be impregnated with the aerosolforming substrate. In step b), the sheet of the retention layer material may be impregnated with the aerosol-forming substrate.

[0211] The uncovered lateral strips described herein may be an uncovered longitudinal strip arranged at a periphery of the corresponding material. The uncovered lateral strips described herein may be an uncovered strip of the corresponding material arranged at a longitudinal edge of the material.

[0212] According to an embodiment of the invention there is provided a hollow tubular retention element manufactured by the method for manufacturing a hollow tubular retention element for an aerosol-generating article as described herein.

[0213] According to an embodiment of the invention there is provided a method for manufacturing an aerosol-generating article comprising the following steps: a) manufacturing a plurality of hollow tubular retention elements using the method for manufacturing a hollow tubular retention element for an aerosol-generating article as described herein; b) providing a plurality of Venturi elements, wherein each Venturi element comprises a longitudinal airflow conduit, wherein the airflow conduit is symmetrically shaped with regard to a central cross-sectional plane of the Venturi element; c) assembling the plurality of hollow tubular retention elements and Venturi elements into a precursor rod; and d) cutting the precursor rod of the plurality of hollow tubular retention elements and Venturi elements to obtain a plurality of aerosol-generating articles.

[0214] According to an embodiment of the invention there is provided a method for manufacturing an aerosol-generating article which may comprise the following steps: New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0215] -24- a) manufacturing a plurality of hollow tubular retention elements using the method for manufacturing a hollow tubular retention element for an aerosol-generating article as described herein; b) providing a plurality of Venturi elements, wherein each Venturi element comprises a longitudinal airflow conduit, wherein the airflow conduit is symmetrically shaped with regard to a central cross-sectional plane of the Venturi element; c) assembling the plurality of hollow tubular retention elements and Venturi elements into a precursor rod; and d) cutting the precursor rod of the plurality of hollow tubular retention elements and Venturi elements to obtain a plurality of aerosol-generating articles.

[0216] In step c), the plurality of the hollow tubular retention elements and the plurality of the Venturi elements may be circumscribed by a wrapper. The wrapper may be a paper wrapper.

[0217] In step c), the precursor rod of the plurality of the hollow tubular retention elements and the plurality of the Venturi elements may comprise repeating units. The repeating unit may comprise a linear sequence of a first Venturi element, a second Venturi element, a first hollow tubular retention element, a third Venturi element and a second hollow tubular retention element.

[0218] The precursor rod may comprise a wrapper. The wrapper may at least partially circumscribe the precursor rod. The wrapper may fully circumscribe the precursor rod. The wrapper may enclose the precursor rod. The precursor rod may be cut at specific positions to obtain one or more aerosol-generating articles.

[0219] Assembling the hollow tubular retention elements and Venturi elements into a precursor rod may improve the efficiency of the manufacturing method. Cutting the precursor rod of the hollow tubular retention elements and Venturi elements may improve the efficiency of the manufacturing method.

[0220] In step d), the precursor rod of the plurality of the hollow tubular retention elements and the plurality of the Venturi elements may be transversely cut at positions (i) between the first Venturi element and the second Venturi element and (ii) at the central cross-sectional plane of the third Venturi element.

[0221] According to an embodiment of the invention there is provided an aerosol-generating article manufactured by the method for manufacturing an aerosol-generating article as described herein.

[0222] According to an embodiment of the invention there is provided an aerosol-generating device configured to be used with the aerosol-generating article described herein.

[0223] The aerosol-generating device may comprise a heating assembly. The heating assembly comprises a heating element. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0224] -25-

[0225] The heating assembly may be an electrically-powered heating assembly. The heating assembly may be an inductive heating assembly.

[0226] The heating element may be configured to circumscribe at least a portion of the hollow tubular retention element. The heating element may be configured to fully circumscribe the hollow tubular retention element.

[0227] The heating element may be an external heating element. The heating element may be arranged around the hollow tubular retention element. The heating element may be arranged around at least a portion of the hollow tubular retention element. The heating element may be arranged around the entire hollow tubular retention element.

[0228] The aerosol-generating device may comprise a cavity. The cavity may be configured to receive the aerosol-generating article described herein. The cavity may be configured to receive at least a portion of the aerosol-generating article as described herein. The cavity may be configured to receive at least a portion of the aerosol-forming substrate. The cavity may be configured to fully receive the aerosol-forming substrate. The heating assembly may comprise a sleeve. The sleeve may circumscribe the cavity of the device. The sleeve may circumscribe at least a portion of the cavity of the device. The sleeve may circumscribe the entire cavity of the device. The sleeve may be configured to define the cavity of the device. The sleeve may be made from a thermally conductive material. The sleeve may define a heating chamber. The sleeve may be configured to circumscribe at least a portion of the aerosol-generating article. The sleeve may be configured to circumscribe the aerosol-forming substrate. The sleeve may be configured to circumscribe the entire aerosol-forming substrate. The heating element may circumscribe the sleeve The heating element may circumscribe at least a portion of the sleeve. The heating element may circumscribe the entire sleeve. The heating element may be in contact with the sleeve. Heat may be transferred from the heating element to the aerosolforming substrate of the article via the sleeve. The sleeve may be configured to receive the aerosol-generating article.

[0229] The heating assembly may comprise an induction coil. The induction coil may be configured to circumscribe the hollow tubular retention element. The induction coil may be configured to circumscribe at least a portion of the hollow tubular retention element. The induction coil may be configured to circumscribe the entire hollow tubular retention element.

[0230] The induction coil may be configured to circumscribe the sleeve. The induction coil may be configured to circumscribe at least a portion of the sleeve. The induction coil may be configured to circumscribe the entire sleeve. The induction coil may be configured to circumscribe the heating element. The induction coil may be configured to circumscribe at least a portion of the heating element. The induction coil may be configured to circumscribe the entire heating element. The induction coil may be configured to heat the heating element. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0231] -26-

[0232] At least a portion of the hollow tubular retention element may be configured as a susceptor member. The hollow tubular retention element may be configured as a susceptor member may be configured to be heated by the induction coil of the aerosol-generating device.

[0233] According to an embodiment of the invention there is provided an aerosol-generating system comprising the aerosol-generating article described herein and an aerosol-generating device described herein.

[0234] The aerosol-generating system may comprise the hollow tubular retention element being configured to be a heating element. The aerosol-generating system may comprise the hollow tubular retention element being configured as a susceptor member.

[0235] The aerosol-generating system may comprise a heating assembly. The heating assembly may comprise a heating element. The heating element may be part of the aerosolgenerating device. The heating element may be part of the aerosol-generating article. The hollow tubular retention element may be configured as the heating element. At least a portion of the hollow tubular retention element may be configured as a susceptor member. The retention layer of the hollow tubular retention element may be configured as a susceptor member.

[0236] The heating assembly may comprise an induction coil. The induction coil may be part of the aerosol-generating device. The induction coil may be configured to heat the heating element. The induction coil may be configured to heat the hollow tubular retention element. The induction coil may be configured to heat at least a portion of the hollow tubular retention element. The induction coil may be configured to heat the retention layer configured to be the susceptor member.

[0237] In use, the aerosol-generating article may be inserted into a heating chamber of the aerosol-generating device. Preferably, the aerosol-generating article comprises the airflowdirecting element, the hollow tubular retention element and the Venturi element. Preferably, the micro-cavities of the hollow tubular retention element hold the aerosol-forming substrate. The aerosol-forming substrate of the hollow tubular retention element may be volatized by the heating element. The heating element may be an external heating element of the device. Additionally or alternatively, at least a portion of the hollow tubular retention element may be configured as a heating element. The user may draw on the Venturi element to cause an airflow through the aerosol-generating article. The volatized aerosol-forming substrate may condense form an aerosol. The aerosol may be inhaled by the consumer.

[0238] Any of the adhesives used herein may be configured to be biodegradable. Any of the adhesives used herein may be a water-based adhesive. Any of the adhesives used herein may be a starch-based adhesive. Any of the adhesives used herein may be a cellulose-based adhesive. Any of the adhesives used herein may be a natural-rubber-based adhesive. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0239] -27-

[0240] The adhesive applied to any of the primary base layer, primary base layer material, secondary base layer, secondary base layer material, retention layer and retention layer material described herein may have a viscosity of between 150 millipascal seconds (mPas) and 2220 millipascal seconds, preferably of between 300 millipascal seconds and 800 millipascal seconds. The adhesive applied to any of the uncovered lateral strips described herein may have a viscosity of between 150 millipascal seconds (mPas) and 2220 millipascal seconds, preferably of between 300 millipascal seconds and 800 millipascal seconds.

[0241] The adhesive applied to any of the wrappers described herein may have a viscosity of between 1000 millipascal seconds (mPas) and 5000 millipascal seconds, preferably of between 1500 millipascal seconds and 4000 millipascal seconds.

[0242] In a preferred embodiment of the aerosol-generating article, the aerosol-generating article comprises the airflow- di recti ng element, the hollow tubular retention element and the Venturi element. The micro-cavities, preferably each of the micro-cavities are circumscribed by one or more sidewalls provided in a hexagonal arrangement. The micro-cavities are arranged in a honeycomb pattern on the inner surface of the hollow tubular retention element. The micro-cavities are at least partially filled with the aerosol-forming substrate. The aerosolforming substrate is a liquid or gel. Preferably, at least a portion of the airflow-directing element, the hollow tubular retention element and the Venturi element is circumscribed by one or more wrappers. Preferably, the micro-cavities are arranged along the longitudinal passageway of the hollow tubular retention element. Preferably, the micro-cavities, more preferably each of the micro-cavities has a maximum diameter of less than between 1 millimetre and 4 millimetres and a depth of between 1 millimetre and 2 millimetres.

[0243] In a preferred embodiment of the retention material, the retention material is a twolayered retention material. The retention material comprises a primary base layer and a retention layer. The retention layer comprises the plurality of micro-cavities. The primary base layer is made from paper or paperboard. Preferably, the retention layer is made from a susceptor material. Preferably, the micro-cavities are arranged in a honeycomb pattern.

[0244] In another preferred embodiment of the retention material, the retention material is a three-layered retention material. The retention material comprises a primary base layer, a secondary base layer and a retention layer. The retention layer comprises the plurality of microcavities. The secondary base layer is sandwiched between the primary base layer and the retention layer. The primary base layer and the secondary base layer are made from paper or paperboard. Preferably, the retention layer is made from a paper-based material. Preferably, the micro-cavities are arranged in a honeycomb pattern. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0245] -28-

[0246] A proximal direction may refer to a direction towards the mouth end of the aerosolgenerating article. A distal direction may refer to a direction opposite to the direction towards the mouth end of the aerosol-generating article.

[0247] A first component being arranged proximal to a second component may refer to the first component being arranged between the second component and the mouth end of the article. A first component being arranged distal to a second component may refer to the first component being arranged between the second component and the air inlet end of the article. The Venturi element may be arranged at the mouth end of the article. The airflow- di recti ng element may be arranged at the air inlet end of the article.

[0248] A proximal end of a component may refer to an end of the component arranged towards the mouth end of the aerosol-generating article. A distal end of a component may refer to an end of the component arranged opposite to the mouth end of the aerosol-generating article. A distal end of the component may refer to an air inlet end of the component. A proximal end of a component may refer to an air outlet end of the component.

[0249] The term “longitudinal axis” of a component may be used to describe an axis extending between a proximal end and an opposed distal end of the component. The term “radial1or “radial direction” may be used to describe a direction perpendicular to the longitudinal axis of the component.

[0250] A diameter of a component may refer to the length of a straight line extending between two points of a circumference of the component and crossing a centre of the component. A diameter of the micro-cavity may refer to the length of a straight line extending between two points of a circumference of the micro-cavity and crossing a centre of the micro-cavity. A diameter of the micro-cavity may refer to the length of a straight line extending between two opposing points on an inner surface of the sidewalls of the micro-cavity and crossing a centre of the micro-cavity. The inner surface of the sidewalls of the micro-cavity may be a surface abutting the micro-cavity.

[0251] A depth of the micro-cavity may refer to the spatial extent of the micro-cavity in a radial direction. The radial direction may be a direction perpendicular to a longitudinal axis of the hollow tubular retention element. A depth of the micro-cavity may refer to the spatial extent of the micro-cavity in a direction perpendicular to a longitudinal plane of a sheet of the retention material.

[0252] A diameter of the hollow tubular retention element may be an inner diameter of the hollow tubular retention element. A diameter of the hollow tubular retention element may be a diameter of the longitudinal passageway of the hollow tubular retention element.

[0253] A length of a component may be the spatial extent of the component along a longitudinal axis of the component. A length of the hollow tubular retention element may be the New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0254] -29- spatial extent of the hollow tubular retention element along a longitudinal axis of the hollow tubular retention element. A length of the airflow-directing element may be the spatial extent of the airflow-directing element along a longitudinal axis of the airflow-directing element. A length of the Venturi element may be the spatial extent of the Venturi element along a longitudinal axis of Venturi element.

[0255] A cross-section of the micro-cavity may refer to a cross-section of the micro-cavity arranged along a longitudinal plane of a sheet of the retention material.

[0256] As used herein, the terms ‘proximal’, ‘distal’, ‘downstream’ and ‘upstream’ are used to describe the relative positions of components, or portions of components, of the aerosolgenerating article in relation to the direction in which a user draws on the aerosol-generating article during use thereof.

[0257] The aerosol-generating article may comprise a mouth end through which in use an aerosol exits the aerosol-generating article and is delivered to a user. The Venturi element may be arranged at the mouth end. The mouth end may also be referred to as the proximal end. In use, a user may draw on the proximal or mouth end of the aerosol-generating article in order to inhale an aerosol generated by the aerosol-generating device. The aerosol-generating article may comprise a distal end opposed to the proximal or mouth end. The proximal or mouth end of the aerosol-generating article may also be referred to as the downstream end and the distal end of the aerosol-generating article may also be referred to as the upstream end. Components, or portions of components, of the aerosol-generating article may be described as being upstream or downstream of one another based on their relative positions between the proximal, downstream or mouth end and the distal or upstream end of the aerosolgenerating device.

[0258] As used herein, an “aerosol-generating device’” may relate to a device that interacts with the aerosol-forming substrate to generate an aerosol. An aerosol-generating device may be a smoking device that interacts with the aerosol-forming substrate of the aerosol-generating article to generate an aerosol that is directly inhalable into a user’s lungs thorough the user's mouth. An aerosol-generating device may be a holder. The device may be an electrically heated smoking device. The aerosol-generating device may be an electrically-heated aerosolgenerating device. The aerosol-generating device may comprise a housing, electric circuitry, a power supply, a heating chamber and a heating element. The aerosol-generating device may be an electrically heated device. The aerosol-generating device may be a handheld device. The aerosol-generating device may be a portable device. The aerosol-generating device may be a heat-not-burn device.

[0259] As used herein with reference to the present invention, the term ‘smoking’ with reference to a device, article, system, substrate, or otherwise does not refer to conventional New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0260] -30- smoking in which an aerosol-forming substrate is fully or at least partially combusted. The aerosol-generating device of the present invention may be arranged to heat the aerosolforming substrate to a temperature below a combustion temperature of the aerosol-forming substrate, but at or above a temperature at which one or more volatile compounds of the aerosol-forming substrate are released to form an inhalable aerosol.

[0261] The aerosol-generating device of the present invention may be arranged to heat the aerosol-forming substrate to a temperature below a combustion temperature of the aerosolforming substrate, but at or above a temperature at which one or more volatile compounds of the aerosol-forming substrate are released to form an inhalable aerosol.

[0262] The aerosol-generating device may comprise electric circuitry. The electric circuitry may comprise a microprocessor, which may be a programmable microprocessor. The microprocessor may be part of a controller. The electric circuitry may comprise further electronic components. The electric circuitry may be configured to regulate a supply of power to the heating assembly. Power may be supplied to the heating assembly continuously following activation of the aerosol-generating device or may be supplied intermittently, such as on a puff-by-puff basis. The power may be supplied to the heating assembly in the form of pulses of electrical current. The electric circuitry may be configured to monitor the electrical resistance of the heating element, and preferably to control the supply of power to the heating assembly dependent on the electrical resistance of the heating element.

[0263] The aerosol-generating device may comprise a power supply, typically a battery, within a main body of the aerosol-generating device. In one embodiment, the power supply is a Lithium-ion battery. Alternatively, the power supply may be a Nickel-metal hydride battery, a Nickel cadmium battery, or a Lithium based battery, for example a Lithium-Cobalt, a Lithium- Iron-Phosphate, Lithium Titanate or a Lithium-Polymer battery. As an alternative, the power supply may be another form of charge storage device such as a capacitor. The power supply may require recharging and may have a capacity that enables to store enough energy for one or more usage experiences; for example, the power supply may have sufficient capacity to continuously generate aerosol for a period of around six minutes or for a period of a multiple of six minutes. In another example, the power supply may have sufficient capacity to provide a predetermined number of puffs or discrete activations of the heating assembly.

[0264] The aerosol-generating device may comprise a cavity. The cavity may be configured to receive the aerosol-generating article. The cavity of the aerosol-generating device may have an open end into which the aerosol-generating article is inserted. The open end may be a proximal end. The cavity may have a closed end opposite the open end. The closed end may be the base of the cavity. The closed end may be closed except for the provision of air apertures arranged in the base. The base of the cavity may be flat. The base of the cavity may New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0265] -31- be circular. The base of the cavity may be arranged upstream of the cavity. The open end may be arranged downstream of the cavity. The cavity may have an elongate extension. The cavity may have a central longitudinal axis. A longitudinal direction may be the direction extending between the open and closed ends along the central longitudinal axis. The central longitudinal axis of the cavity may be parallel to the longitudinal axis of the aerosol-generating device.

[0266] The cavity may be configured as a heating chamber. The cavity may have a cylindrical shape. The cavity may have a hollow cylindrical shape. The cavity may have a shape corresponding to the shape of the aerosol-generating article to be received in the cavity. The cavity may have a circular cross-section. The cavity may have an skewed circular crosssection. The cavity may have an inner diameter corresponding to the outer diameter of the aerosol-generating article.

[0267] An airflow channel may run through the cavity. Ambient air may be drawn into the aerosol-generating device, into the cavity and towards the user through the airflow channel. Downstream of the cavity, a mouthpiece may be arranged or a user may directly draw on the aerosol-generating article. The airflow channel may extend through the mouthpiece.

[0268] The heating element may comprise an electrically resistive material. Suitable electrically resistive materials include but are not limited to: semiconductors such as doped ceramics, electrically "conductive" ceramics (such as, for example, molybdenum disilicide), carbon, graphite, metals, metal alloys and composite materials made of a ceramic material and a metallic material. Such composite materials may comprise doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbides. Examples of suitable metals include titanium, zirconium, tantalum platinum, gold and silver. Examples of suitable metal alloys include stainless steel, nickel-, cobalt-, chromium-, aluminium- titaniumzirconium-, hafnium-, niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese- , gold- and iron-containing alloys, and super-alloys based on nickel, iron, cobalt, stainless steel, Timetai® and iron-manganese-aluminium based alloys. In composite materials, the electrically resistive material may optionally be embedded in, encapsulated or coated with an insulating material or vice-versa, depending on the kinetics of energy transfer and the external physicochemical properties required.

[0269] The heating element may be part of the aerosol-generating device. The aerosolgenerating device may comprise an external heating element. "External" may refer to the aerosol-forming substrate. An external heating element may take any suitable form. For example, an external heating element may take the form of one or more flexible heating foils on a dielectric substrate, such as polyimide. The flexible heating foils can be shaped to conform to the perimeter of the substrate receiving cavity. Alternatively, an external heating element may take the form of a metallic grid or grids, a flexible printed circuit board, a molded New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0270] -32- interconnect device (MID), ceramic heater, flexible carbon fibre heater or may be formed using a coating technique, such as plasma vapour deposition, on a suitable shaped substrate. An external heating element may also be formed using a metal having a defined relationship between temperature and resistivity. In such an exemplary device, the metal may be formed as a track between two layers of suitable insulating materials. An external heating element formed in this manner may be used to both heat and monitor the temperature of the external heating element during operation.

[0271] As an alternative to an electrically resistive heating element, the heating element may be configured as an induction heating element. The induction heating element may be a susceptor member. The susceptor member may comprise a susceptor material. The susceptor material may be a material that is capable of generating heat, when penetrated by an alternating magnetic field. If the susceptor material is conductive, then typically eddy currents are induced by the alternating magnetic field. If the susceptor material is magnetic, then typically another effect that contributes to the heating is commonly referred to hysteresis losses. Hysteresis losses occur mainly due to the movement of the magnetic domain blocks within the susceptor material, because the magnetic orientation of these will align with the magnetic induction field, which alternates. Another effect contributing to the hysteresis loss is when the magnetic domains will grow or shrink within the susceptor material. Commonly all these changes in the susceptor material that happen on a nano-scale or below are referred to as “hysteresis losses”, because they produce heat in the susceptor material. Hence, if the susceptor material is both magnetic and electrically conductive, both hysteresis losses and the generation of eddy currents will contribute to the heating of the susceptor member. If the susceptor material is magnetic, but not conductive, then hysteresis losses will be the only means by which the susceptor member will heat, when penetrated by an alternating magnetic field. The susceptor material may be electrically conductive or magnetic or both electrically conductive and magnetic. An alternating magnetic field generated by one or several induction coils may heat the susceptor member, which then transfers the heat to the aerosol-forming substrate, such that an aerosol is formed. The heat transfer may be mainly by conduction of heat. Such a transfer of heat is best, if the susceptor material is in close thermal contact with the aerosol-forming substrate.

[0272] As used herein, the term ‘aerosol-generating article’ may refer to an article comprising an aerosol-forming substrate that is capable of releasing volatile compounds that can form an aerosol. The aerosol-generating article may be disposable.

[0273] As used herein, the term ‘aerosol-forming substrate’ relates to a substrate capable of releasing one or more volatile compounds that can form an aerosol. Such volatile compounds may be released by heating the aerosol-forming substrate. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0274] -33-

[0275] The aerosol-forming substrate may comprise a tobacco-containing material containing volatile tobacco flavour compounds which are released from the substrate upon heating. The aerosol-forming substrate may comprise a non-tobacco material. The aerosol-forming substrate may comprise an aerosol former that facilitates the formation of a dense and stable aerosol. The aerosol-forming substrate may comprise a flavorant. The aerosl-forming substrate may comprise a botanical material. The botanical material may include material of one or more plants. The botanical material may include one or more herbs, spices, fruits, roots, leaves, grasses, or the like.

[0276] Below, there is provided a non-exhaustive list of non-limiting examples. Any one or more of the features of these examples may be combined with any one or more features of another example, embodiment, or aspect described herein.

[0277] Example 1 : An aerosol-generating article comprising: a hollow tubular retention element comprising a retention material, wherein the retention material comprises a plurality of micro-cavities, wherein the micro-cavities are arranged on an inner surface of the hollow tubular retention element; an aerosol-forming substrate.

[0278] Example 2: The aerosol-generating article according to example 1 , wherein the hollow tubular retention element is made from the retention material.

[0279] Example 3: The aerosol-generating article according to example 1 or example 2, wherein the aerosol-forming substrate is arranged in the micro-cavities, wherein the microcavities are configured to retain the aerosol-forming substrate.

[0280] Example 4: The aerosol-generating article according to any of the preceding examples, wherein the retention material is impregnated with the aerosol-forming substrate.

[0281] Example 5: The aerosol-generating article according to any of the preceding examples, wherein the micro-cavities are arranged along a longitudinal passageway of the hollow tubular retention element, wherein the micro-cavities are configured to be fluidly connected with the longitudinal passageway.

[0282] Example 6: The aerosol-generating article according to any of the preceding examples, wherein the micro-cavities have a maximum diameter of less than between 1 millimetre and 4 millimetres, and preferably of less than between 2 millimetres and 3 millimetres.

[0283] Example 7: The aerosol-generating article according to any of the preceding examples, wherein the micro-cavities have a maximum cross-sectional area of between 3 square millimetres and 7 square millimetres.

[0284] Example 8: The aerosol-generating article according to any of the preceding examples, wherein the micro-cavities have a depth of between 1 millimetre and 2 millimetres, and preferably of about 1 millimetre. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0285] -34-

[0286] Example 9: The aerosol-generating article according to any of the preceding examples, wherein the micro-cavities are arranged in a regular pattern.

[0287] Example 10: The aerosol-generating article according to any of the preceding examples, wherein the micro-cavities are circumscribed by one or more sidewalls, wherein the one or more sidewalls are provided in one of a hexagonal, regular hexagonal, square, triangular, equilateral triangular, regular polygonal or circular arrangement.

[0288] Example 11 : The aerosol-generating article according to example 10, wherein the one or more sidewalls are provided in one of a hexagonal or regular hexagonal arrangement, wherein the micro-cavities are arranged in a honeycomb pattern

[0289] Example 12: The aerosol-generating article according to any of the preceding examples, wherein a cross-section of the micro-cavities is one of hexagonally-shaped, regular hexagonally-shaped, square-shaped, triangularly-shaped, equilateral triangularly-shaped, circularly-shaped and regular polygonally-shaped.

[0290] Example 13: The aerosol-generating article according to any of the preceding examples, wherein a cross-section of the micro-cavities is hexagonally-shaped, wherein the micro-cavities are arranged in a honeycomb pattern.

[0291] Example 14: The aerosol-generating article according to any of the preceding examples, wherein the retention material comprises a retention layer, wherein the retention layer comprises the micro-cavities, wherein the retention layer is arranged on the inner surface of the hollow tubular retention element.

[0292] Example 15: The aerosol-generating article according to any of the preceding examples, wherein the retention material is a multi-layered material, wherein the retention material comprises, preferably consists of a primary base layer and a retention layer, wherein the retention layer comprises the micro-cavities, preferably wherein the primary base layer is made from a paper-based material, preferably wherein the paper-based material is selected from the group consisting of paper and paperboard.

[0293] Example 16: The aerosol-generating article according to example 15, wherein the retention material, preferably the retention layer is configured as a susceptor member.

[0294] Example 17: The aerosol-generating article according to example 16, wherein the retention layer is made from a material selected from the group consisting of carbon, graphite, silicon carbide, molybdenum, stainless steel and any combination thereof.

[0295] Example 18: The aerosol-generating article according to any of examples 1 to 14, wherein the retention material is a multi-layered material, wherein the retention material comprises, preferably consists of a primary base layer, a secondary base layer and a retention layer, wherein the retention layer comprises the micro-cavities. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0296] -35-

[0297] Example 19: The aerosol-generating article according to example 18, wherein one or both of the primary base layer and the secondary base layer are made from a paper-based material, preferably wherein the paper-based material is selected from the group consisting of paper and paperboard.

[0298] Example 20: The aerosol-generating article according to example 18 or example 19, wherein the primary base layer is configured to be porous, and wherein the secondary base layer is configured to be non-porous.

[0299] Example 21 : The aerosol-generating article according to any of the preceding examples, wherein the retention material is made from a paper-based material, preferably wherein the paper-based material is paper.

[0300] Example 22: The aerosol-generating article according to any of the preceding examples, wherein the hollow tubular retention element has a length of between 15 millimetres and 45 millimetres, preferably of between 20 millimetres and 40 millimetres, and more preferably of between 25 millimetres and 35 millimetres.

[0301] Example 23: The aerosol-generating article according to any of the preceding examples, wherein the hollow tubular retention element has an outer diameter of between 4.0 millimetres and 9.0 millimetres, preferably of between 6.0 millimetres and 8.0 millimetres, and more preferably of between 6.5 millimetres and 7.5 millimetres.

[0302] Example 24: The aerosol-generating article according to any of the preceding examples, wherein the hollow tubular retention element has an inner diameter of between 3.5 millimetres and 7.5 millimetres, preferably of between 4.0 millimetres and 7.0 millimetres, and more preferably of between 5.0 millimetres and 6.0 millimetres.

[0303] Example 25: The aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating article comprises an airflow-directing element, wherein the airflow-directing element is arranged at a distal end of the hollow tubular retention element, wherein the airflow-directing element comprises a longitudinal airflow conduit, wherein a diameter of the airflow conduit increases in a proximal direction.

[0304] Example 26: The aerosol-generating article according to example 25, wherein the diameter of the airflow conduit of the airflow-directing element gradually increases in a proximal direction.

[0305] Example 27: The aerosol-generating article according to example 25 or example 26, wherein the airflow conduit of the airflow- di recti ng element is conically shaped, preferably trumpet-shaped.

[0306] Example 28: The aerosol-generating article according to any of examples 25 to 27, wherein a minimum diameter of the airflow conduit of the airflow-directing element is about 1 millimetre. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0307] -36-

[0308] Example 29: The aerosol-generating article according to any of examples 25 to 28, wherein the airflow-directing element has a length of between 2 millimetres and 8 millimetres, preferably of between 3 millimetres and 7 millimetres, and more preferably of between 4 millimetres and 6 millimetres.

[0309] Example 30: The aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating article comprises a Venturi element, wherein the Venturi element is arranged at a proximal end of the hollow tubular retention element, wherein the Venturi element comprises a longitudinal airflow conduit, wherein the longitudinal airflow conduit of the Venturi element comprises a constricted portion.

[0310] Example 31 : The aerosol-generating article according to example 30, wherein the airflow conduit of the Venturi element comprises an inlet portion and an outlet portion, wherein the inlet portion is arranged at a distal end of the Venturi element, wherein the outlet portion is arranged at a proximal end of the Venturi element, wherein a diameter of the airflow conduit of the inlet portion decreases in a proximal direction, wherein a diameter of the airflow conduit of the outlet portion increases in a proximal direction.

[0311] Example 32: The aerosol-generating article according to example 31 , wherein a diameter of the airflow conduit of the inlet portion gradually decreases in a proximal direction, wherein a diameter of the airflow conduit of the outlet portion gradually increases in a proximal direction.

[0312] Example 33: The aerosol-generating article according to any of examples 30 to 32, wherein the Venturi element has a length of between 4 millimetres and 16 millimetres, preferably of between 6 millimetres and 14 millimetres, and more preferably of between 8 millimetres and 12 millimetres.

[0313] Example 34: The aerosol-generating article according to any of examples 31 to 33, wherein the outlet portion of the Venturi element has a length of between 8 millimetres and 12 millimetres, preferably of between 9 millimetres and 11 millimetres, and more preferably of between 9 millimetres and 10 millimetres.

[0314] Example 35: The aerosol-generating article according to any of examples 25 to 34, wherein a minimum diameter of airflow conduit of one or both of the airflow-directing element and the Venturi element is of between 0.6 millimetres and 1.2 millimetres, preferably of between 0.7 millimetres and 1.1 millimetres, more preferably of between 0.8 millimetres and 1 millimetre, and even more preferably of between 0.85 millimetres and 0.95 millimetres.

[0315] Example 36: The aerosol-generating article according to any of examples 25 to 35, wherein one or both of the airflow-directing element and the Venturi element is made from one of paperboard, paper pulp, cotton, and non-woven cellulose acetate. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0316] -37-

[0317] Example 37: The aerosol-generating article according to any of examples 30 to 36, wherein the aerosol-generating article comprises a plurality of ventilation perforations, wherein the ventilation perforations are configured to be fluidly connected with the airflow conduit of the Venturi element.

[0318] Example 38: The aerosol-generating article according example 37, wherein the ventilation perforations are arranged radially around the constricted portion of the longitudinal airflow conduit of the Venturi element.

[0319] Example 39: The aerosol-generating article according example 38, wherein the ventilation perforations are arranged radially around a section of the airflow conduit of the Venturi element of minimum diameter.

[0320] Example 40: The aerosol-generating article according to any examples 25 to 39, wherein at least a portion of the airflow-directing element, the hollow tubular retention element and the Venturi element are circumscribed by a first wrapper, preferably a first paper wrapper.

[0321] Example 41 : The aerosol-generating article according to a examples 40, wherein at least a portion of the hollow tubular retention element and the Venturi element are circumscribed by a second wrapper, preferably a second paper wrapper, wherein at least a portion of the second wrapper is arranged radially outward of the first wrapper.

[0322] Example 42: The aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating article is rod-shaped.

[0323] Example 43: The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate is one of a liquid and a gel.

[0324] Example 44: The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate comprises one or more of an aerosol former, a flavouring material, nicotine and a gelling agent, preferably wherein the aerosol former is selected from the group consisting of glycerol and propylene glycerol.

[0325] Example 45: A method for manufacturing a hollow tubular retention element for an aerosol-generating article comprising the following steps: a) forming a sheet of a retention material comprising a plurality of micro-cavities; b) applying an aerosol-forming substrate to the sheet of the retention material; and c) forming the sheet of the retention material into a hollow tube such that the microcavities are arranged on an inner surface of the hollow tube

[0326] Example 46: The method according to example 45, wherein in step a), a continuous sheet of a retention layer material comprising the plurality of micro-cavities and a continuous sheet of a primary base layer material are supplied from separate bobbins, wherein the continuous sheet of the retention layer material and the continuous sheet of the primary base layer material are bonded to each other in a planar manner by an adhesive. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0327] -38-

[0328] Example 47: The method according to example 46, wherein in step a), the adhesive is applied to the sheet of primary base layer material.

[0329] Example 48: The method according to example 46 or example 47, wherein in step a), a width of the continuous sheet of the primary base layer material is larger than a width of the continuous sheet of the retention layer material, wherein the continuous sheet of the primary base layer material and the continuous sheet of the retention layer material are bonded to each other such that an uncovered lateral strip of the continuous sheet of the primary base layer material is formed.

[0330] Example 49: The method according to any of examples 46 to 48, wherein in step c), an adhesive is applied to the uncovered lateral strip of the continuous sheet of the primary base layer material, wherein the sheet of the retention material is rolled into the hollow tube, wherein the uncovered lateral strip of the continuous sheet of the primary base layer at least partially overlaps with an opposing edge of the sheet of the retention material such that the hollow tube is held in shape by the adhesive applied to the uncovered strip of the continuous sheet of the primary base layer material.

[0331] Example 50: The method according to any of examples 46 to 49, wherein in step a), a continuous sheet of a retention layer material comprising the plurality of micro-cavities, a continuous sheet of a primary base layer material and a continuous sheet of a secondary base layer material are supplied from separate bobbins, wherein the continuous sheet of the retention layer material and the continuous sheet of the secondary base layer material are bonded to each other in a planar manner by an adhesive, and wherein the continuous sheet of the secondary base layer material and the continuous sheet of the primary base layer material are bonded to each other in a planar manner by an adhesive.

[0332] Example 51 : The method according to example 50, wherein the adhesive bonding the retention layer material and the secondary base layer material together is applied on a surface of the secondary base layer material and wherein the adhesive bonding the secondary base layer material and the primary base layer material together is applied on a surface of the primary base layer material.

[0333] Example 52: The method according to example 50 or example 51 , wherein a width of the continuous sheet of the primary base layer material corresponds to a width of the continuous sheet of secondary base layer material, wherein the width of the continuous sheet of the secondary base layer material is larger than a width of the continuous sheet of the retention layer material, wherein the continuous sheet of the primary base layer material and the continuous sheet of the secondary base layer material are bonded to each other such that an uncovered lateral strip of the continuous sheet of the primary base layer material is formed, wherein the continuous sheet of the secondary base layer material and the continuous sheet New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0334] -39- of the retention layer material are bonded to each other such that a first uncovered lateral strip of the continuous sheet of the secondary base layer material and a second uncovered lateral strip of the continuous sheet of the secondary base layer material is formed, and wherein the first uncovered lateral strip of the continuous sheet of the secondary base layer material and the second uncovered lateral strip of the continuous sheet of the secondary base layer material are arranged opposite to each other.

[0335] Example 53: The method according to any of examples 50 to 52, wherein in step c), an adhesive is applied to the uncovered lateral strip of the continuous sheet of the primary base layer material, wherein an adhesive is applied to one or both of the first and second uncovered lateral strip of the continuous sheet of the secondary base layer material, wherein the sheet of the retention material is rolled into the hollow tube, wherein the uncovered lateral strip of the continuous sheet of the primary base layer material at least partially overlaps with an opposing edge of the continuous sheet of the primary base layer material, wherein the first uncovered lateral strip of the continuous sheet of the secondary base layer material at least partially overlaps with the second uncovered lateral strip of the continuous sheet of the secondary base layer material, wherein the hollow tube is held in shape by the adhesive applied to the uncovered lateral strips of the continuous sheets of the primary base layer material and the secondary base layer material.

[0336] Example 54: The method according to any of examples 46 to 53, wherein in step b), the sheet of the retention material, preferably the sheet of the retention layer material, is impregnated with the aerosol-forming substrate.

[0337] Example 55: A hollow tubular retention element manufactured by the method according to any of examples 45 to 54.

[0338] Example 56: A method for manufacturing an aerosol-generating article comprising the following steps: a) manufacturing a plurality of hollow tubular retention elements using the method according to any of examples 45 to 54; b) providing a plurality of Venturi elements, wherein each Venturi element comprises a longitudinal airflow conduit, wherein the airflow conduit is symmetrically shaped with regard to a central cross-sectional plane of the Venturi element; c) assembling the plurality of hollow tubular retention elements and Venturi elements into a precursor rod; and d) cutting the precursor rod of the plurality of hollow tubular retention elements and Venturi elements to obtain a plurality of aerosol-generating articles. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0339] -40-

[0340] Example 57: The method according to example 56, wherein in step c), the plurality of the hollow tubular retention elements and the plurality of the Venturi elements are circumscribed by a wrapper, preferably a paper wrapper.

[0341] Example 58: The method according to example 56 or example 57, wherein in step c), the precursor rod of the plurality of the hollow tubular retention elements and the plurality of the Venturi elements comprises repeating units, wherein the repeating unit comprises a linear sequence of a first Venturi element, a second Venturi element, a first hollow tubular retention element, a third Venturi element and a second hollow tubular retention element.

[0342] Example 59: The method according to any of examples 56 to 58, wherein in step d), the precursor rod of the plurality of the hollow tubular retention elements and the plurality of the Venturi elements is transversely cut at positions (i) between the first Venturi element and the second Venturi element and (ii) at the central cross-sectional plane of the third Venturi element.

[0343] Example 60: An aerosol-generating article manufactured by the method according to any of examples 56 to 59.

[0344] Example 61: An aerosol-generating device configured to be used with the aerosolgenerating article according to any of examples 1 to 44 and 60.

[0345] Example 62: The aerosol-generating device according to example 61, wherein the aerosol-generating device comprises a heating assembly, wherein the heating assembly comprises a heating element.

[0346] Example 63: The aerosol-generating device according to example 62, wherein the heating element is configured to circumscribe the hollow tubular retention element.

[0347] Example 64: The aerosol-generating device according to example 62 or example 63, wherein the heating assembly comprises an induction coil, wherein the induction coil is configured to circumscribe the hollow tubular retention element.

[0348] Example 65: An aerosol-generating system comprising the aerosol-generating article according to any of examples 1 to 44 and 60 and an aerosol-generating device according to any of examples 61 to 64.

[0349] Example 66: The aerosol-generating system according to example 65, wherein the hollow tubular retention element is configured to be a heating element.

[0350] Example 67: The aerosol-generating system according to example 66, wherein the hollow tubular retention element is configured as a susceptor member.

[0351] Features described in relation to one embodiment may equally be applied to other embodiments of the invention. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0352] -41-

[0353] The invention will be further described, by way of example only, with reference to the accompanying drawings in which:

[0354] Fig. 1 shows an aerosol-generating article of the invention including an airflowdirecting element, hollow tubular retention element and Venturi element;

[0355] Fig. 2 shows a sheet of a retention material of the aerosol-generating article according to the invention;

[0356] Fig. 3 shows the sheet of the retention material of the aerosol-generating article according to the invention

[0357] Fig. 4 shows the sheet of the retention material of the aerosol-generating article according to the invention

[0358] Fig. 5 illustrates a method for manufacturing a hollow tubular retention element for the aerosol-generating article according to the invention;

[0359] Fig. 6 shows a cross-section of the hollow tubular retention element during the manufacturing illustrated in Fig. 5;

[0360] Fig. 7 shows the hollow tubular retention element of the aerosol-generating article of the invention;

[0361] Fig. 8 illustrates a step in a method for manufacturing the aerosol-generating article according to the invention;

[0362] Fig. 9 illustrates a step in the method for manufacturing the aerosol-generating article according to the invention;

[0363] Fig. 10 shows the aerosol-generating article of the invention;

[0364] Fig. 11 shows the aerosol-generating article of the invention having two wrappers;

[0365] Fig. 12 shows the aerosol-generating article of the invention;

[0366] Fig. 13 shows the aerosol-generating article of the invention;

[0367] Fig. 14 shows the aerosol-generating article of the invention using a single wrapper.

[0368] Fig. 1 shows an aerosol-generating article 10 according to the invention including an airflow-directing element 12, hollow tubular retention element 14 and Venturi element 16.

[0369] Fig 1A shows the aerosol-generating article 10 without wrappers. The airflow-directing element 12, the hollow tubular retention element 14, and the Venturi element 16 are shown separated from each other for illustrative purposes.

[0370] The aerosol-generating article 10 comprises a distal end 18. The aerosol-generating article 10 comprises a proximal end 20. The airflow-directing element 12 comprises a proximal end 22. The hollow tubular retention element 14 comprises a distal end 24. The airflowdirecting element 12 is arranged at the distal end 18 of the aerosol-generating article 10. The New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0371] -42- hollow tubular retention element 14 comprises a proximal end 26. The Venturi element 16 is arranged at the proximal end 20 of the hollow tubular retention element 14. The hollow tubular retention element 14 is arranged between the airflow-directing element 12 and the Venturi element 16.

[0372] The hollow tubular retention element 14 comprises a retention material 28. The retention material 28 comprises a plurality of micro-cavities. The micro-cavities are arranged on an inner surface of the hollow tubular retention element 14. The micro-cavities comprise an aerosol-forming substrate. The hollow tubular retention element 14 comprises a longitudinal passageway 30. The micro-cavities are arranged along the longitudinal passageway 30. The micro-cavities are fluidly connected to the longitudinal passageway 30.

[0373] The airflow- di recti ng element 12 comprises an airflow conduit 32. The diameter of the airflow conduit 32 of the airflow-directing element 12 increases towards the hollow tubular retention element 14. The Venturi element 16 comprises an airflow conduit 34. The airflow conduit 34 of the Venturi element 16 a comprises centrally arranged constricted portion. A diameter of the airflow conduit 34 of the Venturi element 16 increases from the constricted portion towards the hollow tubular retention element 14. The diameter of the airflow conduit 34 of the Venturi element 16 increases from the constricted portion towards the proximal end 20 of the aerosol-generating article 10. The airflow conduit 32 of the airflow-directing element 12, the longitudinal passageway 30 of the hollow tubular retention element 14 and the airflow conduit 34 of the Venturi element 16 are fluidly connected. The airflow conduit 32 of the airflowdirecting element 12, the longitudinal passageway 30of the hollow tubular retention element 14 and the airflow conduit 34 of the Venturi element 16 form an airflow channel.

[0374] Fig. 1 B shows the aerosol-generating article 10 comprising a wrapper 36. For illustrative purposes, the wrapper 36 is shown partially removed from the aerosol-generating article 10. The wrapper 36 improves the stability the aerosol-generating article 10. The wrapper 36 improves the integrity of the aerosol-generating article 10. The wrapper 36 may be a third wrapper.

[0375] The airflow-directing element 12 abuts the distal end 24 of the hollow tubular retention element 14. The Venturi element 16 abuts the proximal end 26 of the hollow tubular retention element 14. The airflow-directing element 12, hollow tubular retention element 14 and Venturi element 16 are arranged along a central longitudinal axis 37 of the aerosol-generating article 12.

[0376] Fig. 1C shows the fully wrapped aerosol-generating article 10. The wrapper 36 circumscribes the aerosol-generating article 10. In use, the aerosol-generating article 10 may be inserted into an aerosol-generating device. The consumer may draw on the proximal end 20 of the aerosol-generating article 10. Air may be pulled into the airflow conduit 32 of the New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0377] -43- airflow-directing element 12 at the distal end 18 of the aerosol-generating article 10. The aerosol-forming substrate of the micro-cavities may be heated such that at least a portion of the aerosol-forming substrate is volatized. The volatized aerosol-generating article 10 condenses to form an aerosol. The aerosol may be inhaled by the consumer through the Venturi element 16.

[0378] Fig. 2 shows a sheet of the retention material 28 of the aerosol-generating article 10 according to the invention. The retention material 28 is a three-layered material. The retention material 28 comprises a primary base layer 38. The retention material 28 comprises a secondary base layer 40. The retention material 28 comprises a retention layer 42. For illustrative purposes, the layers are shown separated from each other. The inlet of Fig. 2 shows a magnification of a surface of the retention material 28.

[0379] The retention layer 42 comprises micro-cavities 44. The micro-cavities 44 are hexagonally-shaped holes in the retention layer 42. The micro-cavities 44 comprises six sidewalls 46. The sidewalls 46 of the micro-cavities 44 are provided in a hexagonal arrangement. The micro-cavities 44 are arranged in a honeycomb pattern. The micro-cavities 44 are arranged on a surface of the retention material 28. The micro-cavities 44 are configured to receive the aerosol-forming substrate. The retention layer 42 may be impregnated with aerosol-forming substrate. The micro-cavities 44 may contain the aerosol-forming substrate.

[0380] The primary base layer 38 is made from a paper-based material. The primary base layer 38 is porous. By providing the porous primary base layer 38, application of adhesive to the primary base layer 38 is improved. The secondary base layer 40 is made from a paperbased material. The secondary base layer 40 is non-porous. By providing the non-porous secondary base layer 40, the risk of leakage of the aerosol-forming substrate through the retention material 28 is reduced.

[0381] The secondary base layer 40 is sandwiched between the retention layer 42 and the primary base layer 38. The secondary base layer 40 is arranged on top of the primary base layer 38. The retention layer 42 is arranged on top of the secondary base layer 40. The primary base layer 38 is attached to the secondary base layer 40. The secondary base layer 40 is attached to the retention layer 42.

[0382] A width 48 of the primary base layer 38 is essentially equal to a width 50 of the secondary base layer 40. The width 50 of the secondary base layer 40 is larger than a width 52 of the retention layer 42. The secondary base layer 40 and the retention layer 42 are arranged to be flush at a longitudinal edge of the retention material 28. The retention material 28 comprises an uncovered lateral strip 54 of the primary base layer 38. The retention material 28 comprises a first uncovered lateral strip 56 of the secondary base layer 40. The first uncovered lateral strip 56 of the secondary base layer 40 is arranged at a first longitudinal New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0383] -44- edge of the retention material 28. The retention material 28 comprises a second uncovered lateral strip 58 of the secondary base layer 40. The second uncovered lateral strip 58 of the secondary base layer 40 is arranged at a second longitudinal edge of the retention material 28. The second longitudinal edge of the retention material 28 is arranged opposite to the first longitudinal edge. The first uncovered lateral strip 56 of the secondary base layer 40 is arranged to face towards the retention layer 42. The second uncovered lateral strip 58 of the secondary base layer 40 is arranged to face towards the primary base layer 38.

[0384] The secondary base layer 40 is configured to provide a base of the micro-cavities 44. The secondary base layer 40 is configured to prevent leakage of aerosol-generating material towards the primary base layer 38.

[0385] Fig. 3 shows the sheet of the retention material 28 of Fig. 2. The inlet shows a magnification of the surface of the retention material 28. The micro-cavities 44 are filled with aerosol-forming substrate 60. The retention layer 42 is impregnated with aerosol-forming substrate 60. The micro-cavities 44 are configured to retain the aerosol-forming substrate 60.

[0386] The retention material 28 may be formed into the hollow tubular retention element 14. For example, the retention material 28 may be rolled up to form a hollow cylinder. The hollow cylinder may have a circular cross-section. The retention layer 42 with the micro-cavities 44 may be arranged on the inside of the hollow cylinder. The uncovered lateral strips 54, 56, 58 provide a one or more glued seams. The glued seams improve the stability of the hollow tubular retention element 14. The uncovered lateral strips improve the smoothness of the inner and outer surface of the hollow tubular retention element 14.

[0387] Fig. 4 shows the sheet of the retention material 28 of the aerosol-generating article 10 according to the invention. The retention material 28 is a two-layered material. Fig. 4A shows the retention material 28 before impregnation with the aerosol-forming substrate 60. The retention material 28 comprises a primary base layer 38. The retention material 28 comprises a retention layer 42.

[0388] The retention layer 42 comprises the micro-cavities 44. The micro-cavities 44 are configured to be indentations in the surface of the retention layer 42. The micro-cavities 44 comprise sidewalls 46. The retention layer 42 comprises a base 62 of the micro-cavities 44. The base is formed from retention layer material 70. The micro-cavities 44 are hexagonally- shaped. The micro-cavities 44 form a hexagonally-packed array. The micro-cavities 44 are arranged on a surface of the retention material 28. The micro-cavities 44 are configured to receive the aerosol-forming substrate 60. The retention layer 42 may be impregnated with aerosol-forming substrate 60. The micro-cavities 44 may contain the aerosol-forming substrate 60. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0389] -45-

[0390] The retention layer 42 is formed from carbon or graphite. The retention layer 42 is configured as a susceptor member. The retention layer 42 is configured to heat aerosolforming substrate 60 which may be received in the micro-cavities 44. By providing the retention layer 42 configured as a susceptor member, the aerosol-generating article 10 may be used with aerosol-generating devices lacking a heating element. By providing the retention layer 42 configured a susceptor member, the efficiency with which aerosol-forming substrate 60 in the micro-cavities 44 is heated may be improved.

[0391] The retention layer 42 is arranged on top of the primary base layer 38. The retention material 28 comprises the uncovered lateral strip 54 of the primary base material.

[0392] Fig. 4B shows the retention material 28 impregnated with the aerosol-forming substrate 60. The micro-cavities 44 are filled with the aerosol-forming substrate 60. The micro-cavities 44 are configured to retain the aerosol-forming substrate 60.

[0393] The retention material 28 may be rolled up to form a hollow cylinder of circular crosssection. The retention layer 42 with the micro-cavities 44 may be arranged on the surface of the hollow cylinder. Adhesive may be applied the uncovered lateral strip 54. The uncovered lateral strip 54 may at least partially overlap with the opposing longitudinal edge of the retention material 28. The uncovered lateral strip 54 provides a glued seam. The glued seam improves the stability of the hollow tubular retention element 14.

[0394] Fig. 5 illustrates an apparatus 64 used in a method for manufacturing the hollow tubular retention element 14 for the aerosol-generating article 10 according to the invention. The apparatus is used to combine a continuous sheet of primary base layer material 66, a continuous sheet of secondary base layer material 68, and a continuous sheet of retention layer material 70 to form the retention material 28. The apparatus is used to shape the retention material 28 into the hollow tubular retention element 14.

[0395] The apparatus comprises a first supply line for delivering the continuous sheet of the primary base layer material 66. The apparatus comprises a second supply line for delivering the continuous sheet of the secondary base layer material 68. The apparatus comprises a third supply line for delivering the continuous sheet of retention layer material 70. The first supply line comprises a first bobbin 72. The second supply line comprises a second bobbin 74. The third supply line comprises a third bobbin 76. The first bobbin 72 comprises the continuous sheet of the primary base layer material 66. The second bobbin 74 comprises the continuous sheet of the secondary base layer material 68. The third bobbin 76 comprises the continuous sheet of the retention layer material 70. The first supply line comprises a first glue applicator 78. The second supply line comprises a second glue applicator 80. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0396] -46-

[0397] The first glue applicator 78 provides an adhesive to a surface of the continuous sheet of the primary base layer material 66. The second glue applicator 80 provides an adhesive to a surface of the continuous sheet of the secondary base layer material 68.

[0398] The supplies of the continuous sheet of the primary base layer material 66, the continuous sheet of the secondary base layer material 68 and the continuous sheet of the retention layer material 70 may be combined in a planar manner at a position indicated by reference numeral 82. The retention layer 42 material is arranged on top of a stack of the primary base layer material 66, secondary base layer material 68 and retention layer 42 material as indicated by the inlet of Fig. 5.

[0399] The apparatus comprises a first heating block 84. The first heating block 84 is configured to cure the adhesive applied to the sheet of the primary base layer material 66 and the sheet of the secondary base layer material 68. The adhesive applied to the sheet of the primary base layer material 66 permanently attaches the sheet of the primary base layer material 66 to the sheet of the secondary base layer material 68. The adhesive applied to the sheet of the secondary base layer material 68 permanently attaches the sheet of the secondary base layer material 68 to the sheet of the retention layer material 70.

[0400] The sheets 66, 68, 70 are combined such that an uncovered lateral strip 54 of the sheet of the primary base layer material 66 is provided. The sheets are combined such that a first uncovered lateral strip 56 of the sheet of the secondary base layer material 68 is provided. The first uncovered lateral strip 56 of the sheet of the secondary base layer material 68 is supported by the sheet of the primary base layer material 66. The sheets 66, 68, 70 are combined such that a second uncovered lateral strip 58 of the sheet of the secondary base layer material 68 is provided. The second uncovered lateral strip 58 of the sheet of the secondary base layer material 68 is supported by the sheet of the retention layer material 70.

[0401] The apparatus comprises an aerosol-forming substrate applicator 86. The aerosolforming substrate applicator 86 impregnates the retention material 28. Aerosol-forming substrate 60 is applied to the sheet of retention layer material 70. Aerosol-forming substrate 60 is applied to the micro-cavities 44 of the sheet of the retention layer material. The aerosolforming substrate 60 is retained in the micro-cavities 44.

[0402] An adhesive is applied to one or more of the uncovered lateral strips 54, 56, 58. The retention material 28 is rolled up to form a precursor of the hollow tubular retention element 14. The sheet of the retention layer material 70 is arranged on an inner surface of the precursor of the hollow tubular retention element 14. The sheet of the primary base layer material 66 is arranged on an outer surface of the precursor of the hollow tubular retention element 14.

[0403] The apparatus comprises a second heating block 88. The second heating block 88 is configured to cure the adhesive applied to the uncovered lateral strips 54, 56, 58. The adhesive New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0404] -47- attaches a first longitudinal edge of the retention material 28 to a second longitudinal edge of the retention material 28. The adhesive holds the precursor of the hollow tubular retention element 14 in the intended configuration. The precursor of the hollow tubular retention element 14 has a hollow cylindrical shape. The precursor of the hollow tubular retention element 14 has a circular cross-section.

[0405] The sheets are propelled and formed into the precursor of the hollow tubular retention element 14 by garniture belt 90 and a garniture belt drive system 92, 94.

[0406] The precursor of the hollow tubular retention element 14 is divided to obtain hollow tubular retention elements 14.

[0407] Fig. 6 shows a cross-section of the hollow tubular retention element 14 during the manufacturing illustrated in Fig. 5. The retention material 28 is shaped into the precursor of the hollow tubular retention element 14 using the garniture belt 90. The retention layer material 70 with the micro-cavities 44 is arranged on the inside of the precursor of the hollow tubular retention element 14. The primary base layer material 66 is arranged on the outside of the precursor of the hollow tubular retention element 14.

[0408] Fig. 7 shows the hollow tubular retention element 14 of the invention. The hollow tubular retention element 14 of Fig. 7 is made from the three-layered retention material 28 of Fig. 3. The three-layered retention material 28 comprises the primary base layer 38, the secondary base layer 40 and the retention. The retention layer 42 is arranged on the inside of the hollow tubular retention element 14. The retention layer 42 defines the longitudinal passageway 30. The primary base layer 38 is arranged on the outside of the hollow tubular retention element 14. The plurality of micro-cavities 44 forms the inner surface 96 of the hollow tubular retention element 14. The micro-cavities 44 are arranged along the longitudinal passageway 30 of the hollow tubular retention element 14. The micro-cavities 44 are fluidly connected with the longitudinal passageway 30.

[0409] Fig. 7A shows a cross-section through the hollow tubular retention element 14. The hollow tubular retention element 14 has an inner diameter 98. The hollow tubular retention element 14 has an outer diameter 100.

[0410] The hollow tubular retention element 14 is formed from a sheet of the three-layered retention material 28. In the hollow tubular retention element 14, opposing edges of the retention material 28 at least partially overlap. The first uncovered lateral strip 56 of the secondary base layer 40 overlaps with the second uncovered lateral strip 58 of the secondary base layer material 40 to form a first seam 102. An adhesive is arranged between the first uncovered lateral strip 56 and the second uncovered lateral strip 58 of the secondary base layer 40. The adhesive improves the stability of the hollow tubular retention element 14. The uncovered lateral strip 54 of the primary base layer 38 overlaps with an opposing longitudinal New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0411] -48- edge of the primary base layer 38 to form a second seam 104. An adhesive is arranged between the uncovered lateral strip 54 of the primary base layer and the opposing longitudinal edge. The adhesive improves the stability of the hollow tubular retention element 14.

[0412] Fig. 7B shows a three-dimensional illustration of the hollow tubular retention element 14. The hollow tubular retention element 14 has a length 106.

[0413] Fig. 8 illustrates a step in a method for manufacturing an aerosol-generating article 10 according to the invention. Herein, the formation of a precursor rod 108 is illustrated. Successive steps are illustrated from the top row to the bottom row.

[0414] The top row of Fig. 8 is a general overview of a repeating unit 110 of the precursor rod 108. The precursor rod 108 comprises a linear sequence of a plurality of the repeating units 110. The repeating unit 110 of the precursor rod 108 comprises, from right to left, a first Venturi element 16-1 , a second Venturi element 16-2, a first hollow tubular retention element 14-1 , a third Venturi element 16-3 and a second hollow tubular retention element 14-2. For illustrative purposes, the constituent components of the repeating unit 110 are shown separate from each other.

[0415] The second row of Fig. 8 shows the precursor rod 108 with the repeating units 110 aligned in a linear sequence. The precursor rod 108 comprises a plurality of the repeating units 110. For illustrative purposes, only a subsection of the continuous precursor rod 108 is shown.

[0416] The third row of Fig. 8 illustrates the precursor rod 108 in the process of getting wrapped by a sheet of wrapper 36. The individual components of the repeating unit 110 of the precursor rod 108 are indicated for illustrative purposes by dashed lines. Arrow 112 shows the direction of transport of the precursor rod 108 during the manufacturing process. The wrapper 36 encloses the precursor rod 108.

[0417] The fourth row of Fig. 8 shows the fully wrapped precursor rod 108. The individual components of the repeating unit 110 of the precursor rod 108 are indicated for illustrative purposes by dashed lines.

[0418] The bottom row of Fig. 8 shows the fully wrapped precursor rod 108 without the illustrative dashed lines.

[0419] Fig. 9 illustrates a step in the method for manufacturing an aerosol-generating article 10 of according to the invention. Herein, it is illustrated how the aerosol-generating article 10 is obtained from the continuous wrapped precursor rod 108 of Fig. 8. The aerosol-generating articles 10 are obtained from the continuous precursor rod 108 by cutting the precursor rod 108 at specific positions. Each of the three rows shown in Fig. 9 illustrate the cutting positions.

[0420] The first row of Fig. 9 corresponds to the illustration of the precursor rod 108 of the fourth row of Fig. 8. Herein, cutting positions have a further been illustrated by cross-sectional planes. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0421] -49-

[0422] The second row of Fig. 9 corresponds to the illustration of the precursor rod 108 of the bottom row of Fig. 8. Herein, cutting positions have a further been illustrated by cross-sectional planes.

[0423] The bottom row of Fig. 9 shows a longitudinal cross-section of the precursor rod 108. The cutting plane are illustrated by dashed lines. The precursor rod 108 is cut at the cutting planes to result in a plurality of aerosol-generating articles 10. Three-dimensional illustrations of the resulting aerosol-generating articles 10 are shown below as indicated by arrows. A first cutting plane 114 is at a position along the length of the precursor rod 108 where the first Venturi element 16-1 and the second Venturi element 16-2 abut. The Venturi elements 16-1 , 16-2 separated at such first cutting plane 114 correspond to the Venturi elements 16 of two separate aerosol-generating articles 10. A second cutting plane 116 is the central cross- sectional plane of the third Venturi element 16-3. The second cutting plane 116 extends through the section of the airflow conduit 34 of the Venturi element 16-3 which has a minimum diameter. The two portions of the Venturi element 16-3 resulting from cutting the Venturi element 16-3 at the second cutting plane 116 correspond to two separate airflow-directing elements 12. The resulting two separate airflow-directing elements 12 are part of two separate aerosol-generating articles 10. The precursor rod 108 is cut at corresponding first and second cutting planes 116 along the precursor rod 108 to obtain the plurality of aerosol-generating articles 10. The plurality of the resulting aerosol-generating articles 10 are shown in a three- dimensional view below the corresponding section of the precursor rod 108.

[0424] Fig. 10 shows the aerosol-generating article 10 of the invention. The aerosolgenerating article 10 is shown with a first type of wrapping. In the first type of wrapping, the aerosol-generating article 10 is wrapped with two separate wrappers.

[0425] Fig. 10A corresponds to Fig. 1A.

[0426] Fig. 10B shows the aerosol-generating article 10 being wrapped with a first wrapper 118. For illustrative purposes, the first wrapper 118 is shown partially removed from the aerosol-generating article 10. The first wrapper 118 fully encloses the airflow-directing element 12 and the hollow tubular retention element 14. The first wrapper 118 encloses a portion of the Venturi element 16.

[0427] Fig. 10C shows the aerosol-generating article 10 being wrapped with a second wrapper 120. For illustrative purposes, the second wrapper 120 is shown partially removed from the aerosol-generating article 10. The second wrapper 120 partially overlaps with the first wrapper 118. The second wrapper 120 circumscribes the Venturi element 16. The second wrapper 120 circumscribes a portion of the hollow tubular retention element 14.

[0428] Fig. 10D shows the fully wrapped aerosol-generating article 10. New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0429] -50-

[0430] Fig. 11 shows the aerosol-generating article 10 of the invention having two wrappers of Fig. 10. Herein, the above first type of wrapping of Fig. 10 is further illustrated.

[0431] The top of Fig. 11 shows the airflow- di recti ng element 12, the hollow tubular retention element 14 and the Venturi element 16 of the aerosol-generating article 10. For illustrative purposes, such components are shown separate from each other. The airflow-directing element 12 has a length 122. The hollow tubular retention element 14 has a length 124. The hollow tubular retention element 14 has an inner diameter 126. The hollow tubular retention element 14 has an outer diameter 128. The Venturi element 16 has a length 130. The airflow conduit 32 of the airflow- di recti ng element 12 has a minimum diameter 132. The minimum diameter 132 of the airflow-directing element 12 corresponds to the minimum diameter of the Venturi element 16.

[0432] The bottom of Fig. 14 shows the first wrapper 118 and the second wrapper 120. The first wrapper 118 has a length 134. The second wrapper 120 has a length 136. The first wrapper 118 has a width 138. The second wrapper 120 has a width 140. The relative position of the first and second wrappers 120 and the aerosol-generating article 10 indicates the approximate position of the first and second wrappers 120 along the length of the aerosolgenerating article 10 and relative to each other.

[0433] Fig. 12 shows the aerosol-generating article 10 of the invention. The remarks with regard to Figs. 10 and 11 apply correspondingly. Fig. 12A shows a three-dimensional view of the aerosol-generating article 10. Fig. 12B shows a longitudinal cross-section of the aerosolgenerating article 10.

[0434] The aerosol-generating article 10 comprises the airflow- di recti ng element 12, the hollow tubular retention element 14, the Venturi element 16 and the first and second wrapper 118, 120. The aerosol-generating article 10 comprises ventilation perforations 142. The ventilation perforations 142 are fluidly connected to the airflow conduit of the Venturi element 16. The ventilation perforations 142 are arranged radially around the portion of the airflow conduit 34 of the Venturi element 16 of minimum diameter.

[0435] The Venturi element 16 has an inlet portion 144. The Venturi element 16 has an outlet portion 146. The outlet portion 146 has a length 148. The length of the outlet portion may correspond to a length of the inlet portion.

[0436] Fig. 13 shows the aerosol-generating article 10 the invention. Fig. 13A shows a three- dimensional view of the aerosol-generating article 10. Fig. 13B shows a longitudinal crosssection of the aerosol-generating article 10. Herein, the airflow through the aerosol-generating article 10 is indicated by arrows 150. Air enters the aerosol-generating article 10 through an air inlet 152 of the airflow-directing element 12. The air inlet 152 of the airflow-directing element 12 is arranged at the distal end 18 of the aerosol-generating article 10. The air inlet 152 is New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT

[0437] -51- fluidly connected to the airflow conduit 32 of the airflow-directing element 12. The airflow conduit 32 of the airflow-directing element 12 is trumpet-shaped. The airflow conduit 32 of the airflow-directing element is fluidly connected to the longitudinal passage 30 of the hollow tubular retention element 14. A turbulent airflow in the hollow tubular retention element 14 is induced. The turbulent airflow collides with the inner surface 96 of the hollow tubular retention element 14. The aerosol-forming substrate 60 of the retention material 28 may be volatized by a heating element. The turbulent airflow picks up volatized aerosol-forming substrate 60. The homogeneity of the aerosol is improved.

[0438] The airflow enters the Venturi element 16 via an air inlet 154 of the Venturi element 16. The Venturi element 16 comprises a constricted portion 156. The constricted portion 156 comprises a portion of the airflow conduit 34 of the Venturi element 16 of minimum diameter. The airflow is accelerated towards an air outlet 158 of the Venturi element 16. The airflow conduit 34 of the Venturi element is fluidly connected to the ventilation perforations 142. Airflow through the ventilation perforations 142, indicated by arrow 160, is pulled into the airflow conduit 34 of the Venturi element 16.

[0439] Fig. 14 shows the aerosol-generating article 10 of the invention. The aerosolgenerating article 10 is shown with a second type of wrapping. In the second type of wrapping of the aerosol-generating article 10, the aerosol-generating article 10 is wrapped with a single wrapper 162.

[0440] The top of Fig. 14 shows the airflow- di recti ng element 12, the hollow tubular retention element 14 and the Venturi element 16 of the aerosol-generating article 10. For illustrative purposes, such components are shown separate from each other.

[0441] The bottom of Fig. 14 shows the first wrapper 118. The wrapper has a length 164. The length 164 may be different to the length 134. The relative position of the wrapper 118 and the aerosol-generating article 10 indicates the position of the wrapper 118 along the length of the aerosol-generating article 10.

Claims

New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT-52-CLAIMS1. An aerosol-generating article comprising: a hollow tubular retention element comprising a retention material, wherein the retention material comprises a plurality of micro-cavities, wherein the micro-cavities are arranged on an inner surface of the hollow tubular retention element, wherein the microcavities are circumscribed by one or more sidewalls, wherein the one or more sidewalls are provided in one of a hexagonal or regular hexagonal arrangement, wherein the micro-cavities are arranged in a honeycomb pattern; an aerosol-forming substrate.

2. The aerosol-generating article according to claim 1, wherein the aerosolforming substrate is arranged in the micro-cavities, wherein the micro-cavities are configured to retain the aerosol-forming substrate, and wherein the aerosol-forming substrate is one of a liquid and a gel.

3. The aerosol-generating article according to claim 1 or claim 2, wherein the micro-cavities are arranged along a longitudinal passageway of the hollow tubular retention element, and wherein the micro-cavities are configured to be fluidly connected with the longitudinal passageway.

4. The aerosol-generating article according to any of the preceding claims, wherein the micro-cavities have a maximum diameter of less than between 1 millimetre and 4 millimetres, and preferably of less than between 2 millimetres and 3 millimetres.

5. The aerosol-generating article according to any of the preceding claims, wherein the micro-cavities have a depth of between 1 millimetre and 2 millimetres, and preferably of about 1 millimetre.

6. The aerosol-generating article according to any of the preceding claims, wherein the retention material is a multi-layered material, wherein the retention material comprises a primary base layer, a retention layer and optionally a secondary base layer, wherein the retention layer comprises the micro-cavities, and preferably wherein one or more of the primary base layer, the retention layer and the secondary base layer are made from a paper-based material.New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT-53-7. The aerosol-generating article according to any of the preceding claims, wherein the aerosol-generating article comprises an airflow-directing element, wherein the airflow-directing element is arranged at a distal end of the hollow tubular retention element, wherein the airflow-directing element comprises a longitudinal airflow conduit, and wherein a diameter of the longitudinal airflow conduit increases in a proximal direction.

8. The aerosol-generating article according to any of the preceding claims, wherein the aerosol-generating article comprises a Venturi element, wherein the Venturi element is arranged at a proximal end of the hollow tubular retention element, wherein the Venturi element comprises a longitudinal airflow conduit, and wherein the longitudinal airflow conduit of the Venturi element comprises a constricted portion.

9. The aerosol-generating article according to claim 8, wherein the aerosolgenerating article comprises a plurality of ventilation perforations, wherein the ventilation perforations are configured to be fluidly connected with the longitudinal airflow conduit of the Venturi element, and wherein the ventilation perforations are arranged radially around the constricted portion of the longitudinal airflow conduit of the Venturi element.

10. An aerosol-generating device configured to be used with the aerosol-generating article according to any of claims 1 to 9.

11. An aerosol-generating system comprising the aerosol-generating article according to any of claims 1 to 9 and an aerosol-generating device according to claim 10.

12. A method for manufacturing a hollow tubular retention element for an aerosolgenerating article comprising the following steps: a) forming a sheet of a retention material comprising a plurality of micro-cavities, wherein the micro-cavities are circumscribed by one or more sidewalls, wherein the one or more sidewalls are provided in one of a hexagonal or regular hexagonal arrangement, wherein the micro-cavities are arranged in a honeycomb pattern; b) applying an aerosol-forming substrate to the sheet of the retention material; and c) forming the sheet of the retention material into a hollow tube such that the microcavities are arranged on an inner surface of the hollow tube.New PCT Patent Application September 22, 2025 Philip Morris Products S.A. 46089-PCT-54-13. A method for manufacturing an aerosol-generating article comprising the following steps: a) manufacturing a plurality of hollow tubular retention elements using the method according to claim 12; b) providing a plurality of Venturi elements, wherein each Venturi element comprises a longitudinal airflow conduit, wherein the airflow conduit is symmetrically shaped with regard to a central cross-sectional plane of the Venturi element; c) assembling the plurality of hollow tubular retention elements and Venturi elements into a precursor rod; and d) cutting the precursor rod of the plurality of hollow tubular retention elements andVenturi elements to obtain a plurality of aerosol-generating articles.

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