US20250228285A1 - Aerosol-generating article with downstream section - Google Patents

Aerosol-generating article with downstream section

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Publication number
US20250228285A1
US20250228285A1 US18/853,634 US202318853634A US2025228285A1 US 20250228285 A1 US20250228285 A1 US 20250228285A1 US 202318853634 A US202318853634 A US 202318853634A US 2025228285 A1 US2025228285 A1 US 2025228285A1
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US
United States
Prior art keywords
aerosol
millimetres
downstream
hollow tubular
length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US18/853,634
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English (en)
Inventor
Eva Saade Latorre
Jerome Uthurry
Hüseyin Efe SENYILMAZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philip Morris Products SA
Original Assignee
Philip Morris Products SA
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Filing date
Publication date
Application filed by Philip Morris Products SA filed Critical Philip Morris Products SA
Assigned to PHILIP MORRIS PRODUCTS S.A. reassignment PHILIP MORRIS PRODUCTS S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SENYILMAZ, Hüseyin Efe, SAADE LATORRE, Eva, Uthurry, Jerome
Publication of US20250228285A1 publication Critical patent/US20250228285A1/en
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter tips or filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces of cigars or cigarettes
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure
    • A24D3/043—Tobacco smoke filters characterised by their shape or structure with ventilation means, e.g. air dilution
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B13/00—Tobacco for pipes, for cigars, e.g. cigar inserts, or for cigarettes; Chewing tobacco; Snuff
    • A24B13/02—Flakes or shreds of tobacco
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
    • A24B15/10—Chemical features of tobacco products or tobacco substitutes
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A24D1/02—Cigars; Cigarettes with special covers
    • A24D1/027—Cigars; Cigarettes with special covers with ventilating means, e.g. perforations
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A24D1/20—Cigarettes specially adapted for simulated smoking devices
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter tips or filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces of cigars or cigarettes
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter tips or filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces of cigars or cigarettes
    • A24D3/17—Filters specially adapted for simulated smoking devices

Definitions

  • the present invention relates to an aerosol-generating article comprising an aerosol-generating substrate and adapted to produce an inhalable aerosol upon heating.
  • a number of prior art documents disclose aerosol-generating devices for consuming aerosol-generating articles.
  • Such devices include, for example, electrically heated aerosol-generating devices in which an aerosol is generated by the transfer of heat from one or more electrical heater elements of the aerosol-generating device to the aerosol-generating substrate of a heated aerosol-generating article.
  • electrically heated aerosol-generating devices have been proposed that comprise an internal heater blade which is adapted to be inserted into the aerosol-generating substrate.
  • Use of an aerosol-generating article in combination with an external heating system is also known.
  • WO 2020/115151 describes the provision of one or more heating elements arranged around the periphery of the aerosol-generating article when the aerosol-generating article is received in a cavity of the aerosol-generating device.
  • inductively heatable aerosol-generating articles comprising an aerosol-generating substrate and a susceptor arranged within the aerosol-generating substrate have been proposed by WO 2015/176898.
  • a diameter of the rod of aerosol-generating substrate falling within the ranges described herein is particularly advantageous in terms of a balance between energy consumption and aerosol delivery.
  • This advantage is felt in particular when an aerosol-generating article comprising a rod of aerosol-generating substrate having a diameter as described herein is used in combination with an external heater arranged around the periphery of the aerosol-generating article. Under such operating conditions, it has been observed that less thermal energy is required to achieve a sufficiently high temperature at the core of the rod of aerosol-generating substrate and, in general, at the core of the article. Thus, when operating at lower temperatures, a desired target temperature at the core of the aerosol-generating substrate may be achieved within a desirably reduced time frame and by a lower energy consumption.
  • the use of a rod of aerosol-generating substrate having a smaller diameter may also advantageously reduce the overall weight of tobacco material that is needed in the aerosol-generating article whilst still being able to produce the desired levels of aerosol. The level of tobacco waste can therefore be reduced.
  • a ratio between the length of the rod of aerosol-generating substrate and an overall length of the aerosol-generating article is preferably at least 0.20.
  • a ratio between the length of the rod of aerosol-generating substrate and an overall length of the aerosol-generating article is at least 0.25. More preferably, a ratio between the length of the rod of aerosol-generating substrate and an overall length of the aerosol-generating article is at least 0.30.
  • a ratio between the length of the rod of aerosol-generating substrate and an overall length of the aerosol-generating article is preferably less than 0.50.
  • a ratio between the length of the rod of aerosol-generating substrate and an overall length of the aerosol-generating article is less than 0.45. More preferably, a ratio between the length of the rod of aerosol-generating substrate and an overall length of the aerosol-generating article is less than 0.40.
  • a ratio between the length of the rod of aerosol-generating substrate and an overall length of the aerosol-generating article is from 0.20 to 0.50, preferably from 0.20 to 0.45, more preferably from 0.20 to 0.40. In other embodiments, a ratio between the length of the rod of aerosol-generating substrate and an overall length of the aerosol-generating article is from 0.25 to 0.50, preferably from 0.25 to 0.45, more preferably from 0.25 to 0.40. In further embodiments, a ratio between the length of the rod of aerosol-generating substrate and an overall length of the aerosol-generating article is from 0.30 to 0.50, preferably from 0.30 to 0.45, more preferably from 0.30 to 0.40. In yet further embodiments, a ratio between the length of the rod of aerosol-generating substrate and an overall length of the aerosol-generating article is from 0.30 to 0.50, preferably from 0.30 to 0.45, more preferably from 0.30 to 0.40.
  • the aerosol-generating substrate may comprise a tobacco material.
  • the rod of aerosol-generating substrate may comprise a tobacco material.
  • the tobacco material may comprise a shredded tobacco material.
  • the shredded tobacco material may be in the form of cut filler or tobacco cut filler.
  • the tobacco material has a bulk density of at least 100 mg per cubic centimetre. More preferably, the tobacco material has a bulk density of at least 125 mg per cubic centimetre. More preferably, the tobacco material has a bulk density of at least 150 mg per cubic centimetre. Even more preferably, the tobacco material has a bulk density of at least 200 mg per cubic centimetre. Preferably, the tobacco material has a bulk density of less than 345 mg per cubic centimetre. More preferably, the tobacco material has a bulk density of less than 325 mg per cubic centimetre. Even more preferably, the tobacco material has a bulk density of less than 300 mg per cubic centimetre. Even more preferably, the tobacco material has a bulk density of less than 290 mg per cubic centimetre.
  • the tobacco material has a bulk density of less than 280 mg per cubic centimetre.
  • the tobacco material may have a bulk density of from 100 mg per cubic centimetre to 350 mg per cubic centimetre, preferably from 100 mg per cubic centimetre to 345 mg per cubic centimetre, more preferably from 125 mg per cubic centimetre to 325 mg per cubic centimetre, more preferably from 150 mg per cubic centimetre to 300 mg per cubic centimetre, more preferably from 150 mg per cubic centimetre to 290 mg per cubic centimetre, even more preferably from 200 mg per cubic centimetre to 280 mg per cubic centimetre.
  • the RTD of the rod of aerosol-generating substrate is preferably at least 4 millimetres H 2 O. More preferably, the RTD of the rod of aerosol-generating substrate is at least 5 millimetres H 2 O. Even more preferably, the RTD of the rod of aerosol-generating substrate is millimetres H 2 O.
  • the RTD of the rod of aerosol-generating substrate is from 4 millimetres H 2 O to 10 millimetres H 2 O, preferably from 5 millimetres H 2 O to 10 millimetres H 2 O, preferably from 6 millimetres H 2 O to 25 millimetres H 2 O. In other embodiments, the RTD of the rod of aerosol-generating substrate is from 4 millimetres H 2 O to 20 millimetres H 2 O, preferably from 5 millimetres H 2 O to 18 millimetres H 2 O preferably from 6 millimetres H 2 O to 16 millimetres H 2 O.
  • the aerosol-generating substrate may be a solid aerosol-generating substrate.
  • the aerosol-generating substrate preferably comprises an aerosol former.
  • the aerosol former may be any suitable known compound or mixture of compounds that, in use, facilitates formation of a dense and stable aerosol.
  • the aerosol former may be facilitating that the aerosol is substantially resistant to thermal degradation at temperatures typically applied during use of the aerosol-generating article.
  • the aerosol-generating substrate comprises less than 90 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate, more preferably less than 80 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate, more preferably less than 70 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate, more preferably less than 60 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate, more preferably less than 50 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate, more preferably less than 40 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate.
  • the aerosol-generating substrate comprises less than 30 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate, more preferably less than 25 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate, more preferably less than 20 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate.
  • the aerosol-generating substrate may comprise between 5 percent and 30 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate, more preferably between 6 percent and 25 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate, more preferably between 10 percent and 20 percent by weight of aerosol former on a dry weight basis of the aerosol-generating substrate.
  • the cut filler suitable to be used with the present invention generally may resemble cut filler used for conventional smoking articles.
  • the cut width of the cut filler preferably is between 0.3 millimetres and 2.0 millimetres, more preferably, the cut width of the cut filler is between 0.5 millimetres and 1.2 millimetres and most preferably, the cut width of the cut filler is between 0.6 millimetres and 0.9 millimetres.
  • the cut width may play a role in the distribution of heat inside the rod of aerosol-generating substrate. Also, the cut width may play a role in the resistance to draw of the article. Further, the cut width may impact the overall density of the aerosol-generating substrate as a whole.
  • the weight of the cut filler is between 80 milligrams and 400 milligrams, preferably between 150 milligrams and 250 milligrams, more preferably between 170 milligrams and 220 milligrams.
  • This amount of cut filler typically allows for sufficient material for the formation of an aerosol. Additionally, in the light of the aforementioned constraints on diameter and size, this allows for a balanced density of the rod of aerosol-generating substrate between energy uptake, resistance to draw and fluid passageways within the rod of aerosol-generating substrate where the aerosol-generating substrate comprises plant material.
  • the amount of aerosol former has a target value of about 13 percent by weight on a dry weight basis of the cut filler.
  • the most efficient amount of aerosol former will depend also on the cut filler, whether the cut filler comprises plant lamina or homogenized plant material. For example, among other factors, the type of cut filler will determine to which extent the aerosol-former can facilitate the release of substances from the cut filler.
  • a rod of aerosol-generating substrate comprising cut filler as described above is capable of efficiently generating sufficient amount of aerosol at relatively low temperatures.
  • a temperature of between 150 degrees Celsius and 200 degrees Celsius in the heating chamber may be sufficient for one such cut filler to generate sufficient amounts of aerosol while in aerosol-generating devices using tobacco cast leave sheets typically temperatures of about 250 degrees Celsius are employed.
  • a further advantage connected with operating at lower temperatures is that there is a reduced need to cool down the aerosol. As generally low temperatures are used, a simpler cooling function may be sufficient. This in turn allows using a simpler and less complex structure of the aerosol-generating article.
  • the one or more sheets as described herein may each individually have a grammage of between 100 grams per square metre and 600 grams per square metre.
  • the sheets are preferably in the form of one or more gathered sheets.
  • gathered denotes that the sheet of homogenised plant material is convoluted, folded, or otherwise compressed or constricted substantially transversely to the cylindrical axis of a plug or a rod.
  • the one or more sheets of homogenised plant material may be gathered transversely relative to the longitudinal axis thereof and circumscribed with a wrapper to form a continuous rod or a plug.
  • the one or more sheets of homogenised plant material may advantageously be crimped or similarly treated.
  • crimped denotes a sheet having a plurality of substantially parallel ridges or corrugations.
  • the one or more sheets of homogenised plant material may be embossed, debossed, perforated or otherwise deformed to provide texture on one or both sides of the sheet.
  • the one or more sheets of homogenised plant material may be cut into strands as referred to above.
  • the aerosol-generating substrate comprises a plurality of strands of the homogenised plant material.
  • the strands may be used to form a plug.
  • the width of such strands is about 5 millimetres, or about 4 millimetres, or about 3 millimetres, or about 2 millimetres or less.
  • the length of the strands may be greater than about 5 millimetres, between about 5 millimetres to about 15 millimetres, about 8 millimetres to about 12 millimetres, or about 12 millimetres.
  • the strands have substantially the same length as each other.
  • the homogenised plant material may comprise up to 95 percent by weight of plant particles, on a dry weight basis.
  • the homogenised plant material comprises up to 90 percent by weight of plant particles, more preferably up to 80 percent by weight of plant particles, more preferably up to 70 percent by weight of plant particles, more preferably up to 60 percent by weight of plant particles, more preferably up to 50 percent by weight of plant particles, on a dry weight basis.
  • the homogenised plant material may further comprise one or more aerosol formers.
  • an aerosol former can convey other vaporised compounds released from the aerosol-generating substrate upon heating, such as nicotine and flavourants, in an aerosol.
  • Suitable aerosol formers for inclusion in the homogenised plant material are known in the art and include, but are not limited to: polyhydric alcohols, such as triethylene glycol, propylene glycol, 1,3-butanediol and glycerol; esters of polyhydric alcohols, such as glycerol mono-, di- or triacetate; and aliphatic esters of mono-, di- or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate.
  • the susceptor element is arranged substantially longitudinally within the rod. This means that the length dimension of the elongate susceptor element is arranged to be approximately parallel to the longitudinal direction of the rod, for example within plus or minus 10 degrees of parallel to the longitudinal direction of the rod. In preferred embodiments, the elongate susceptor element may be positioned in a radially central position within the rod, and extends along the longitudinal axis of the rod.
  • the susceptor element extends all the way to a downstream end of the rod of aerosol-generating substrate.
  • the susceptor element may extend all the way to an upstream end of the rod of aerosol-generating substrate.
  • the susceptor element has substantially the same length as the rod of aerosol-generating substrate, and extends from the upstream end of the rod to the downstream end of the rod.
  • the susceptor element is preferably in the form of a pin, rod, strip or blade.
  • the susceptor element has a constant cross-section, for example a circular cross-section, it has a preferable width or diameter from 1 millimetre to 5 millimetres.
  • the susceptor element has the form of a strip or blade
  • the strip or blade preferably has a rectangular shape and a thickness from 0.03 millimetres to 0.15 millimetres, more preferably from 0.05 millimetres to 0.09 millimetres.
  • a susceptor element in the form of a strip of blade may have a thickness of 0.07 millimetres.
  • the elongate susceptor element has a thickness from 57 micrometres to 63 micrometres. Even more preferably, the elongate susceptor element has a thickness from 58 micrometres to 62 micrometres. In a particularly preferred embodiment, the elongate susceptor element has a thickness of 60 micrometres.
  • the susceptor element may be formed from any material that can be inductively heated to a temperature sufficient to generate an aerosol from the aerosol-generating substrate.
  • Preferred susceptor elements comprise a metal or carbon.
  • the paper wrapper may have a thickness of less than or equal to 55 micrometres, preferably less than or equal to 50 micrometres, more preferably less than or equal to 45 micrometres.
  • the paper wrapper may have a thickness from 25 micrometres to 55 micrometres, preferably from 30 micrometres to 50 micrometres, more preferably from 35 micrometres to 45 micrometres. In a preferred embodiment, the paper wrapper may have a thickness of 40 microns.
  • the wrapper may be formed of a laminate material comprising a plurality of layers.
  • the wrapper is formed of an aluminium co-laminated sheet.
  • a co-laminated sheet comprising aluminium advantageously prevents combustion of the aerosol-generating substrate in the event that the aerosol-generating substrate should be ignited, rather than heated in the intended manner.
  • a paper layer of the co-laminated sheet may have a grammage of at least 35 gsm, preferably at least 40 gsm.
  • the paper layer of the co-laminated sheet may have a grammage of less than or equal to 55 gsm, preferably less than or equal to 50 gsm.
  • the paper layer of the co-laminated sheet may have a grammage from 35 gsm to 55 gsm, preferably from 40 gsm to 50 gsm. In a preferred embodiment, the paper layer of the co-laminated sheet may have a grammage of 45 gsm.
  • a paper layer of the co-laminated sheet may have a thickness of at least 50micrometres, preferably at least 55 micrometres, more preferably at least 60 micrometres.
  • the paper layer of the co-laminated sheet may have a thickness of less than or equal to 80 micrometres, preferably less than or equal to 75 micrometres, more preferably less than or equal to 70 micrometres.
  • a metallic layer of the co-laminated sheet may have a grammage of at least 12 gsm, preferably at least 15 gsm.
  • the metallic layer of the co-laminated sheet may have a grammage of less than or equal to 25 gsm, preferably less than or equal to 20 gsm.
  • the metallic layer of the co-laminated sheet may have a grammage from 12 gsm to 25 gsm, preferably from 15 gsm to 20 gsm. In a preferred embodiment, the metallic layer of the co-laminated sheet may have a grammage of 17 gsm.
  • the metallic layer of the co-laminated sheet may have a thickness from 2 micrometres to 15 micrometres, preferably from 3 micrometres to 12 micrometres, more preferably from 5 micrometres to 10 micrometres. In a preferred embodiment, the metallic layer of the co-laminated sheet may have a thickness of 6 microns.
  • the paper wrapper comprising PVOH or silicone (or polysiloxane) may have a thickness of at least 25 micrometres, preferably at least 30 micrometres, more preferably at least 35 micrometres.
  • the paper wrapper comprising PVOH or silicone (or polysiloxane) may have a thickness of less than or equal to 50 micrometres, preferably less than or equal to 45 micrometres, more preferably less than or equal to 40 micrometres.
  • the paper wrapper comprising PVOH or silicone (or polysiloxane) may have a thickness from 25 micrometres to 50 micrometres, preferably from 30 micrometres to 45 micrometres, more preferably from 35 micrometres to 40 micrometres.
  • the paper wrapper comprising PVOH or silicone (or polysiloxane) may have a thickness of 37 micrometres.
  • a flame retardant composition may typically further comprise one of more non-flame retardant compounds, that is, one or more compound—such as a solvent, an excipient, a filler—that does not actively contribute to providing the carrier substrate with flammability protection, but is used to facilitate the application of the flame retardant compound or compounds onto or into the wrapper or both.
  • flame retardant compounds are known to the skilled person.
  • several flame retardant compounds and formulations suitable for treating cellulosic materials are known and have been disclosed and may find use in the manufacture of wrappers for aerosol-generating articles in accordance with the present invention.
  • the upstream section, or upstream element thereof may advantageously facilitate the insertion of the upstream end of the article into the cavity.
  • the inclusion of the upstream element may additionally protect the end of the rod of aerosol-generating substrate during the insertion of the article into the cavity such that the risk of damage to the substrate is minimised.
  • An upstream element may be a porous plug element.
  • an upstream element has a porosity of at least 50 percent in the longitudinal direction of the aerosol-generating article. More preferably, an upstream element has a porosity of between 50 percent and 90 percent in the longitudinal direction.
  • the porosity of an upstream element in the longitudinal direction is defined by the ratio of the cross-sectional area of material forming the upstream element and the internal cross-sectional area of the aerosol-generating article at the position of the upstream element.
  • the porosity or permeability of an upstream element may advantageously be designed in order to provide an aerosol-generating article with a particular overall resistance to draw (RTD) without substantially impacting the filtration provided by other portions of the article.
  • RTD overall resistance to draw
  • the RTD of an upstream element may be at least 0.1 millimetres H 2 O, or at least 0.25 millimetres H 2 O or at least 0.5 millimetres H 2 O.
  • the RTD of an upstream element is from 0.1 millimetres H 2 O to 2 millimetres H 2 O, preferably from 0.25 millimetres H 2 O to 2 millimetres H 2 O, more preferably from 0.5 millimetres H 2 O to 2 millimetres H 2 O.
  • the combined RTD of the upstream section, or upstream element thereof, and the rod of aerosol-generating substrate is less than 15 millimetres H 2 O, more preferably less than 12 millimetres H 2 O, more preferably less than 10 millimetres H 2 O.
  • the diameter of the longitudinal cavity of the hollow tubular segment forming an upstream element is at least 3 millimetres, more preferably at least 3.5 millimetres, more preferably at least 4 millimetres and more preferably at least 4.5 millimetres.
  • the diameter of the longitudinal cavity is maximised in order to minimise the RTD of the upstream section, or upstream element thereof.
  • the wall thickness of the hollow tubular segment is less than 2 millimetres, more preferably less than 1.5 millimetres and more preferably less than 1 millimetre.
  • An upstream element of the upstream section may be made of any material suitable for use in an aerosol-generating article.
  • the upstream element may, for example, be made of a same material as used for one of the other components of the aerosol-generating article, such as the downstream filter segment or the hollow tubular cooling element.
  • Suitable materials for forming the upstream element include filter materials, ceramic, polymer material, cellulose acetate, cardboard, zeolite or aerosol-generating substrate.
  • the upstream element may comprise a plug of cellulose acetate.
  • the upstream element may comprise a hollow acetate tube, or a cardboard tube.
  • the upstream section or an upstream element has a length of at least 2millimetres, more preferably at least 3 millimetres, more preferably at least 4 millimetres.
  • the upstream section or an upstream element has a length of between 2 millimetres and 10 millimetres, more preferably between 3 millimetres and 8 millimetres, more preferably between 2 millimetres and 6 millimetres, more preferably between 3 millimetres and 6 millimetres, more preferably between 4 millimetres and 8 millimetres, more preferably between 4 millimetres and 6 millimetres.
  • the upstream section or an upstream element has a length of 5 millimetres.
  • the length of the upstream section or an upstream element can advantageously be varied in order to provide the desired total length of the aerosol-generating article. For example, where it is desired to reduce the length of one of the other components of the aerosol-generating article, the length of the upstream section or an upstream element may be increased in order to maintain the same overall length of the article.
  • the length of the upstream section, or an upstream element thereof can be used to control the position of the aerosol-generating article within the cavity of an aerosol-generating device, for articles which are intended to be externally heated. This can advantageously ensure that the position of the aerosol-generating substrate within the cavity can be optimised for heating and the position of any ventilation can also be optimised.
  • an aerosol-generating article comprises a downstream section located downstream of the rod of aerosol-generating substrate.
  • the downstream section is preferably located immediately downstream of the rod of aerosol-generating substrate.
  • the downstream section of the aerosol-generating article preferably extends between the rod of aerosol-generating substrate and the downstream end of the aerosol-generating article.
  • the downstream section may comprise one or more elements, each of which will be described in more detail within the present disclosure.
  • a length of the downstream section may be at least 40 millimetres. A length of the downstream section may be at least 45 millimetres. A length of the downstream section may be greater than 45 millimetres. A length of the downstream section may be at least 48 millimetres. A length of the downstream section may be at least 50 millimetres.
  • a length of the downstream section may be less than 75 millimetres.
  • a length of the downstream section may be equal to or less than 70 millimetres.
  • a length of the downstream section may be equal to or less than 65 millimetres.
  • a length of the downstream section may be between 40 millimetres and 75 millimetres, or between 45 millimetres and 75 millimetres, or between 48 millimetres and 75 millimetres, or between 50 millimetres and 75 millimetres.
  • a length of the downstream section may be between 40 millimetres and 70 millimetres, or between 45 millimetres and 70 millimetres, or between 48 millimetres and 70 millimetres, or between 50 millimetres and 70 millimetres.
  • a length of the downstream section may be between 40 millimetres and 65 millimetres, or between 45 millimetres and 65 millimetres, or between 48 millimetres and 65 millimetres, or between 50 millimetres and 65 millimetres.
  • Providing a relatively long downstream section ensures that a suitable length of the aerosol-generating article protrudes from an aerosol-generating device when the article is received therein.
  • a suitable protrusion length facilitates the ease of insertion and extraction of the article from the device, which also ensures that the upstream portions of the article are suitably inserted into the device with reduced risk of damage, particularly during insertion.
  • a ratio between a length of the downstream section and an overall length of the aerosol-generating article may be less than 0.85.
  • a ratio between a length of the downstream section and an overall length of the aerosol-generating article may be less than 0.80. More preferably, a ratio between a length of the downstream section and an overall length of the aerosol-generating article may be less than 0.75. Even more preferably, a ratio between a length of the downstream section and an overall length of the aerosol-generating article may be less than 0.70.
  • a ratio between a length of the downstream section and an overall length of the aerosol-generating article may be at least 0.50.
  • a ratio between a length of the downstream section and an overall length of the aerosol-generating article may be at least 0.55. More preferably, a ratio between a length of the downstream section and an overall length of the aerosol-generating article may be at least 0.60. Even more preferably, a ratio between a length of the downstream section and an overall length of the aerosol-generating article may be at least 0.65.
  • a ratio between a length of the downstream section and an overall length of the aerosol-generating article is from 0.50 to 0.85, preferably from 0.55 to 0.85, more preferably from 0.60 to 0.85, even more preferably from 0.65 to 0.85. In other embodiments, a ratio between a length of the downstream section and an overall length of the aerosol-generating article is from 0.50 to 0.80, preferably from 0.55 to 0.80, more preferably from 0.60 to 0.80, even more preferably from 0.65 to 0.80.
  • a ratio between a length of the downstream section and an overall length of the aerosol-generating article is from 0.50 to 0.75, preferably from 0.55 to 0.75, more preferably from 0.60 to 0.75, even more preferably from 0.65 to 0.75. In further embodiments, a ratio between a length of the downstream section and an overall length of the aerosol-generating article is from 0.50 to 0.70, preferably from 0.55 to 0.70, more preferably from 0.60 to 0.70, even more preferably from 0.65 to 0.70.
  • a ratio between a length of the downstream section and a length of the upstream section may be less than 30.
  • a ratio between a length of the downstream section and a length of the upstream section may be less than 20. More preferably, a ratio between a length of the downstream section and a length of the upstream section may be less than 15. Even more preferably, a ratio between a length of the downstream section and a length of the upstream section may be less than 10.
  • a ratio between a length of the downstream section and a length of the upstream section may be at least 4.
  • a ratio between a length of the downstream section and a length of the upstream section may be at least 5.
  • a ratio between a length of the downstream section and a length of the upstream section may be at least 6.
  • a ratio between a length of the downstream section and a length of the upstream section may be at least 7.
  • a ratio between a length of the downstream section and a length of the upstream section is from 4 to 30, preferably from 5 to 30, more preferably from 6 to 30, even more preferably from 7 to 18. In other embodiments, a ratio between a length of the downstream section and a length of the upstream section is from 4 to 20, preferably from 5 to 20, more preferably from 6 to 20, even more preferably from 7 to 20. In further embodiments, a ratio between a length of the downstream section and a length of the upstream section is from 4 to 15, preferably from 5 to 15, more preferably from 6 to 15, even more preferably from 7 to 15. In further embodiments, a ratio between a length of the downstream section and a length of the upstream section is from 4 to 10, preferably from 5 to 10, more preferably from 6 to 10, even more preferably from 7 to 10.
  • a ratio between the length of the downstream section and the length of the rod of aerosol-generating substrate is preferably at least 1.0. More preferably, a ratio between the length of the downstream section and the length of the rod of aerosol-generating substrate is at least 1.25. More preferably, a ratio between the length of the downstream section and the length of the rod of aerosol-generating substrate is at least 1.5. More preferably, a ratio between the length of the downstream section and the length of the rod of aerosol-generating substrate is at least 1.75.
  • a ratio between the length of the downstream section and the length of the rod of aerosol-generating substrate is preferably less than 3.5.
  • a ratio between the length of the downstream section and the length of the rod of aerosol-generating substrate is less than 3.25. More preferably, a ratio between the length of the downstream section and the length of the rod of aerosol-generating substrate is less than 3.0. Even more preferably, a ratio between the length of the downstream section and the length of the rod of aerosol-generating substrate is less than 2.75.
  • a ratio between the length of the downstream section and the length of the rod of aerosol-generating substrate is from 1.0 to 3.0, preferably from 1.25 to 3.0, more preferably from 1.50 to 3.0, even more preferably from 1.75 to 3.0. In further embodiments, a ratio between the length of the downstream section and the length of the rod of aerosol-generating substrate is from 1.0 to 2.75, preferably from 1.25 to 2.75, more preferably from 1.50 to 2.75, even more preferably from 1.75 to 2.75.
  • the downstream section of an aerosol-generating article according to the present invention preferably comprises a hollow tubular cooling element provided downstream of the rod of aerosol-generating substrate.
  • the hollow tubular cooling element may advantageously provide an aerosol-cooling element for the aerosol-generating article.
  • the hollow tubular cooling element may be provided immediately downstream of the rod of aerosol-generating substrate. In other words, the hollow tubular cooling element may abut a downstream end of the rod of aerosol-generating substrate.
  • the hollow tubular cooling element may define an upstream end of the downstream section of the aerosol-generating article.
  • the downstream end of the aerosol-generating article may coincide with the downstream end of the downstream section.
  • the downstream section of the aerosol-generating article comprises a single hollow tubular element.
  • the downstream section of the aerosol-generating article may comprise only one hollow tubular element.
  • the downstream section comprises two or more hollow tubular elements, as described below.
  • the term “hollow tubular element” denotes a generally elongate element defining a lumen or airflow passage along a longitudinal axis thereof.
  • tubular will be used in the following with reference to a tubular element having a substantially cylindrical cross-section and defining at least one airflow conduit establishing an uninterrupted fluid communication between an upstream end of the tubular element and a downstream end of the tubular element.
  • the hollow tubular cooling element may be an individual, discrete element of the aerosol-generating article which has a defined length and thickness.
  • An internal volume defined by the hollow tubular cooling element may be at least 100 cubic millimetres.
  • a volume of the cavity or lumen defined by the hollow tubular cooling element may be at least 100 cubic millimetres.
  • an internal volume defined by the hollow tubular cooling element may be at least 300 cubic millimetres.
  • An internal volume defined by the hollow tubular cooling element may be at least 700 cubic millimetres.
  • An internal volume defined by the hollow tubular cooling element may be between 100 and 1200 cubic millimetres. Preferably, an internal volume defined by the hollow tubular cooling element may be between 300 and 1000 cubic millimetres. An internal volume defined by the hollow tubular cooling element may be between 700 and 900 cubic millimetres.
  • a hollow tubular cooling element provides an unrestricted flow channel. This means that the hollow tubular cooling element provides a negligible level of resistance to draw (RTD).
  • RTD resistance to draw
  • the term “negligible level of RTD” is used to describe an RTD of less than 1 millimetres H 2 O per 10 millimetres of length of the hollow tubular cooling element, preferably less than 0.4 millimetres H 2 O per 10 millimetres of length of the hollow tubular cooling element, more preferably less than 0.1 millimetres H 2 O per 10 millimetres of length of the hollow tubular cooling element.
  • the RTD of a hollow tubular cooling element is preferably less than or equal to 10 millimetres H 2 O. More preferably, the RTD of a hollow tubular cooling element is less than or equal to 5 millimetres H 2 O. Even more preferably, the RTD of a hollow tubular cooling element is less than or equal to 2.5 millimetres H 2 O. Even more preferably, the RTD of the hollow tubular cooling element is less than or equal to 2 millimetres H 2 O. Even more preferably, the RTD of the hollow tubular cooling element is less than or equal to 1 millimetre H 2 O.
  • the RTD of a hollow tubular cooling element may be at least 0 millimetres H 2 O, or at least 0.25 millimetres H 2 O or at least 0.5 millimetres H 2 O or at least 1 millimetre H 2 O.
  • the RTD of a hollow tubular cooling element is from 0 millimetre H 2 O to 10 millimetres H 2 O, preferably from 0.25 millimetres H 2 O to 10 millimetres H 2 O, preferably from 0.5 millimetres H 2 O to 10 millimetres H 2 O. In other embodiments, the RTD of a hollow tubular cooling element is from 0 millimetres H 2 O to 5 millimetres H 2 O, preferably from 0.25 millimetres H 2 O to 5 millimetres H 2 O preferably from 0.5 millimetres H 2 O to 5 millimetres H 2 O.
  • the RTD of a hollow tubular cooling element is from 0 millimetres H 2 O to 2 millimetres H 2 O, preferably from 0.25 millimetres H 2 O to 2 millimetres H 2 O, more preferably from 0.5 millimetres H 2 O to 2 millimetres H 2 O. In a particularly preferred embodiment, the RTD of a hollow tubular cooling element is 0 millimetre H 2 O.
  • the overall RTD of the article depends essentially on the RTD of the rod and optionally on the RTD of the downstream and/or upstream elements. This is because the hollow tubular cooling element is substantially empty and, as such, substantially only marginally contribute to the overall RTD of the aerosol-generating article.
  • the flow channel should therefore be free from any components that would obstruct the flow of air in a longitudinal direction.
  • the flow channel is substantially empty and particularly preferably the flow channel is empty.
  • the aerosol-generating article may comprise a ventilation zone at a location along the downstream section.
  • the aerosol-generating article may comprise a ventilation zone at a location along the hollow tubular cooling element.
  • ventilation zone may extend through the peripheral wall of the hollow tubular cooling element. As such, fluid communication is established between the flow channel internally defined by the hollow tubular cooling element and the outer environment. The ventilation zone is further described within the present disclosure.
  • a ratio between the length of the hollow tubular cooling element and the length of the rod of aerosol-generating substrate is preferably less than 3.5.
  • a ratio between the length of the hollow tubular cooling element and the length of the rod of aerosol-generating substrate is less than 3.25. More preferably, a ratio between the length of the hollow tubular cooling element and the length of the rod of aerosol-generating substrate is less than 3.0. Even more preferably, a ratio between the length of the hollow tubular cooling element and the length of the rod of aerosol-generating substrate is less than 2.75.
  • a ratio between the length of the hollow tubular cooling element and the length of the rod of aerosol-generating substrate is from 1.0 to 3.5, preferably from 1.25 to 3.5, more preferably from 1.50 to 3.5, even more preferably from 1.75 to 3.5. In other embodiments, a ratio between the length of the hollow tubular cooling element and the length of the rod of aerosol-generating substrate is from 1.0 to 3.25, preferably from 1.25 to 3.25, more preferably from 1.50 to 3.25, even more preferably from 1.75 to 3.25.
  • a ratio between a length of the hollow tubular cooling element and a length of the downstream section may be at least 0.35.
  • a ratio between a length of the hollow tubular cooling element and a length of the downstream section may be at least 0.45. More preferably, a ratio between a length of the hollow tubular cooling element and a length of the downstream section may be at least 0.50. Even more preferably, a ratio between a length of the hollow tubular cooling element and a length of the downstream section may be at least 0.60.
  • Providing a downstream section or hollow tubular cooling element with the ratios listed above maximises the aerosol cooling and formation benefits of having a relatively long hollow tubular cooling element while providing a sufficient amount of filtration for an aerosol-generating article that is configured to be heated, not combusted. Further, providing a longer hollow tubular cooling element may advantageously lower the effective RTD of the downstream section of the aerosol-generating article, which would primarily be defined by the RTD of a downstream filter segment.
  • the hollow tubular cooling element preferably has an outer diameter that is approximately equal to the outer diameter of the rod of aerosol-generating substrate and to the outer diameter of the aerosol-generating article.
  • the hollow tubular cooling element may have an internal diameter of at least 2 millimetres.
  • the hollow tubular cooling element may have an internal diameter of at least 3 millimetres, at least 4 millimetres, or at least 5 millimetres.
  • a hollow tubular cooling element having an internal diameter as set out above may advantageously provide sufficient rigidity and strength to the hollow tubular cooling element.
  • the hollow tubular cooling element may have an internal diameter of no more than 10 millimetres.
  • the hollow tubular cooling element may have an internal diameter of no more than 9 millimetres, no more than 8 millimetres, or no more than 7 millimetres.
  • a hollow tubular cooling element having an internal diameter as set out above may advantageously reduce the resistance to draw of the hollow tubular cooling element.
  • the hollow tubular cooling element may have an internal diameter of between 2 millimetres and 10 millimetres, between 3 millimetres and 9 millimetres, between 4 millimetres and 8 millimetres, or between 5 millimetres and 7 millimetres.
  • the ratio between an internal diameter of the hollow tubular cooling element and the external diameter of the hollow tubular cooling element may be at least 0.8.
  • the ratio between an internal diameter of the hollow tubular cooling element and the external diameter of the hollow tubular cooling element may be at least 0.85, at least 0.9, or at least 0.95.
  • the ratio between an internal diameter of the hollow tubular cooling element and the external diameter of the hollow tubular cooling element may be no more than 0.99.
  • the ratio between an internal diameter of the hollow tubular cooling element and the external diameter of the hollow tubular cooling element may be no more than 0.98.
  • the hollow tubular cooling element comprises cellulose acetate tow
  • the cellulose acetate tow may have a denier per filament of between 2 and 4 and a total denier of between 25 and 40.
  • the inventors have found that the temperature drop caused by the admission of cooler, external air into the hollow tubular cooling element via the ventilation zone may have an advantageous effect on the nucleation and growth of aerosol particles.
  • Such critical cluster is identified as the key nucleation core from which droplets are expected to grow due to condensation of molecules from the vapour. It is assumed that virgin droplets that just nucleated emerge with a certain original diameter, and then may grow by several orders of magnitude. This is facilitated and may be enhanced by rapid cooling of the surrounding vapour, which induces condensation. In this connection, it helps to bear in mind that evaporation and condensation are two sides of one same mechanism, namely gas-liquid mass transfer. While evaporation relates to net mass transfer from the liquid droplets to the gas phase, condensation is net mass transfer from the gas phase to the droplet phase. Evaporation (or condensation) will make the droplets shrink (or grow), but it will not change the number of droplets.
  • the rapid cooling induced by the admission of external air into the hollow tubular cooling element via the ventilation zone can be favourably used to favour nucleation and growth of aerosol droplets.
  • the admission of external air into the hollow tubular cooling element has the immediate drawback of diluting the aerosol stream delivered to the consumer.
  • the inventors have also surprisingly found that the diluting effect on the aerosol—which can be assessed by measuring, in particular, the effect on the delivery of aerosol former (for example, glycerol) included in the aerosol-generating substrate—is advantageously minimised when the ventilation level is within the ranges described above.
  • aerosol former for example, glycerol
  • Ventilation levels between 10 percent and 20 percent, and even more preferably between 12 and 18 percent, have been found to lead to particularly satisfactory values of glycerol delivery.
  • the overall RTD of the article can advantageously be fine-tuned by adjusting the length and density of the rod of aerosol-generating substrate or the length and optionally the length and density of any segment of filtration material forming part of the downstream section, such as for example a downstream filter segment, or the length and density of a segment of filtration material provided upstream of the aerosol-generating substrate.
  • aerosol-generating articles that have a predetermined RTD can be manufactured consistently and with great precision, such that satisfactory levels of RTD can be provided for the consumer even in the presence of ventilation.
  • the downstream filter segment may optionally comprise a flavourant, which may be provided in any suitable form.
  • the downstream filter segment may comprise one or more capsules, beads or granules of a flavourant, or one or more flavour loaded threads or filaments.
  • the downstream filter segment has a low particulate filtration efficiency.
  • the downstream filter segment preferably has an external diameter that is approximately equal to the external diameter of the aerosol-generating article.
  • the diameter of a downstream filter segment may be substantially the same as the outer diameter of the hollow tubular cooling element.
  • the resistance to draw (RTD) of a component or the aerosol-generating article is measured in accordance with ISO 6565-2015.
  • the RTD refers the pressure required to force air through the full length of a component.
  • the terms “pressure drop” or “draw resistance” of a component or article may also refer to the “resistance to draw”.
  • Such terms generally refer to the measurements in accordance with ISO 6565-2015 are normally carried out at under test at a volumetric flow rate of 17.5 millilitres per second at the output or downstream end of the measured component at a temperature of 22 degrees Celsius, a pressure of 101 kPa (about 760 Torr) and a relative humidity of 60%.
  • Conditions for smoking and smoking machine specifications are set out in ISO Standard 3308 (ISO 3308:2000).
  • Atmosphere for conditioning and testing are set out in ISO Standard 3402 (ISO 3402:1999).
  • the resistance to draw (RTD) of the downstream section may be at least 0 millimetres H 2 O.
  • the RTD of the downstream section may be at least 3 millimetres H 2 O.
  • the RTD of the downstream section may be at least 6 millimetres H 2 O.
  • the resistance to draw (RTD) characteristics of the downstream section may be wholly or mostly attributed to the RTD characteristics of the downstream filter segment of the downstream section.
  • the RTD of the downstream filter segment of the downstream section may wholly define the RTD of the downstream section.
  • the resistance to draw (RTD) of the downstream filter segment may be at least 0 millimetres H 2 O.
  • the RTD of the downstream filter segment may be at least 3 millimetres H 2 O.
  • the RTD of the downstream filter segment may be at least 6 millimetres H 2 O.
  • the resistance to draw of the downstream filter segment may be greater than or equal to 0 millimetres H 2 O and less than 12 millimetres H 2 O.
  • the resistance to draw of the downstream filter segment may be greater than or equal to 3 millimetres H 2 O and less than 12 millimetres H 2 O.
  • the resistance to draw of the downstream filter segment may be greater than or equal to 0 millimetres H 2 O and less than 11 millimetres H 2 O. Even more preferably, the resistance to draw of the downstream filter segment may be greater than or equal to 3 millimetres H 2 O and less than 11 millimetres H 2 O.
  • the downstream filter segment may be formed of a fibrous filtration material.
  • the downstream filter segment may be formed of a porous material.
  • the downstream filter segment may be formed of a biodegradable material.
  • the downstream filter segment may be formed of a cellulose material, such as cellulose acetate.
  • a downstream filter segment may be formed from a bundle of cellulose acetate fibres having a denier per filament between 10 and 15.
  • the downstream filter segment may be formed of a polylactic acid based material.
  • the downstream filter segment may be formed of a bioplastic material, preferably a starch-based bioplastic material.
  • the downstream filter segment may be made by injection moulding or by extrusion.
  • Bioplastic-based materials are advantageous because they are able to provide downstream filter segment structures which are simple and cheap to manufacture with a particular and complex cross-sectional profile, which may comprise a plurality of relatively large air flow channels extending through the downstream filter segment material, that provides suitable RTD characteristics.
  • the downstream filter segment may be formed from a sheet of suitable material that has been crimped, pleated, gathered, woven or folded into an element that defines a plurality of longitudinally extending channels.
  • sheet of suitable material may be formed of paper, cardboard, a polymer, such as polylactic acid, or any other cellulose-based, paper-based material or bioplastic-based material.
  • a cross-sectional profile of such a downstream filter segment may show the channels as being randomly oriented.
  • a ratio of the length of the hollow tubular cooling element to the length of the downstream filter segment may be equal to or less than 8.5.
  • a ratio of the length of the hollow tubular cooling element to the length of the downstream filter segment may be equal to or less than 6.
  • a ratio of the length of the hollow tubular cooling element to the length of the downstream filter segment may be equal to or less than 4.
  • the ventilation zone downstream of the filter segment may comprise a plurality of perforations.
  • the ventilation zone downstream of the filter segment comprises at least one circumferential row of perforations.
  • the ventilation zone downstream of the filter segment may comprise two circumferential rows of perforations.
  • the perforations may be formed online during manufacturing of the aerosol-generating article.
  • each circumferential row of perforations comprises from 8 to 30 perforations.
  • the downstream section may comprise a hollow tubular support element upstream of the hollow tubular cooling element described above.
  • the hollow tubular support element abuts the downstream end of the rod of aerosol-generating substrate.
  • the hollow tubular support element abuts the upstream end of the hollow tubular cooling element.
  • the hollow tubular support element and the hollow tubular cooling element are adjacent to each other and together provide a hollow tubular section within the downstream section.
  • the hollow tubular support element may be formed from any suitable material or combination of materials.
  • the support element may be formed from one or more materials selected from the group consisting of: cellulose acetate; cardboard; crimped paper, such as crimped heat resistant paper or crimped parchment paper; and polymeric materials, such as low density polyethylene (LDPE).
  • LDPE low density polyethylene
  • the support element is formed from cellulose acetate.
  • Other suitable materials include polyhydroxyalkanoate (PHA) fibres.
  • the hollow tubular support element comprises a hollow acetate tube.
  • the hollow tubular support element may have an outer diameter of between 5 millimetres and 10 millimetres, for example of between 5.5 millimetres and 9 millimetres or of between 6 millimetres and 8 millimetres. In a preferred embodiment, the hollow tubular support element has an external diameter of less than 7 millimetres.
  • the hollow tubular support element may have a length of at least 5 millimetres.
  • the support element has a length of at least 6 millimetres, more preferably at least 7 millimetres.
  • the length of the hollow tubular section may be between 20 millimetres and 60 millimetres, or between 30 millimetres and 60 millimetres, or between 40 millimetres and 60 millimetres, or between 45 millimetres and 60 millimetres. In other embodiments, the length of the hollow tubular section may be between 20 millimetres and 55 millimetres, or between 30 millimetres and 55 millimetres, or between 40 millimetres and 55 millimetres, or between 45 millimetres and 55 millimetres.
  • the length of the hollow tubular section may be between 20 millimetres and 50 millimetres, or between 30 millimetres and 50 millimetres, or between 40 millimetres and 50 millimetres, or between 45 millimetres and 50 millimetres.
  • the downstream hollow tubular element preferably extends to the downstream end of the downstream section.
  • the downstream hollow tubular element therefore preferably extends to the downstream end of the aerosol-generating article.
  • an additional downstream hollow tubular element may be provided, so that the downstream section comprises two adjacent downstream hollow tubular elements, downstream of the downstream filter segment.
  • the RTD of the downstream hollow tubular element may be at least 0 millimetres H 2 O, or at least 0.25 millimetres H 2 O or at least 0.5 millimetres H 2 O or at least 1 millimetre H 2 O.
  • the combined length of the hollow tubular cooling element and the downstream hollow tubular element (or elements) is preferably less than 60 millimetres. More preferably, the combined length is less than 55 millimetres. More preferably, the combined length is less than 50 millimetres.
  • the combined length of the hollow tubular cooling element and the downstream hollow tubular element may be between 20 millimetres and 60 millimetres, or between 30 millimetres and 60 millimetres, or between 40 millimetres and 60 millimetres, or between 45 millimetres and 60 millimetres.
  • the combined length may be between 20 millimetres and 55 millimetres, or between 30 millimetres and 55 millimetres, or between 40 millimetres and 55 millimetres, or between 45 millimetres and 55 millimetres.
  • the downstream hollow tubular element may be a paper tube.
  • the downstream hollow tubular element may be a tube formed from spirally wound paper.
  • the downstream hollow tubular element may be formed from a plurality of layers of the paper.
  • the paper may have a basis weight of at least 50 grams per square meter, at least 60 grams per square meter, at least 70 grams per square meter, or at least 90 grams per square meter.
  • downstream section further comprises an additional downstream hollow tubular element
  • the additional downstream hollow tubular element may be formed of the same material as the downstream hollow tubular element, or a different material.
  • the downstream section may comprise a ventilation zone at a location on the downstream hollow tubular element.
  • this ventilation zone at a location on the downstream hollow tubular element may be provided instead of a ventilation zone at a location on the hollow tubular cooling element.
  • the ventilation zone at a location on the downstream hollow tubular element may be provided in addition to the ventilation zone provided at a location on the hollow tubular cooling element.
  • the downstream section may optionally further comprise may further comprise an additional cooling element defining a plurality of longitudinally extending channels such as to make a high surface area available for heat exchange.
  • an additional cooling element is adapted to function substantially as a heat exchanger.
  • the plurality of longitudinally extending channels may be defined by a sheet material that has been pleated, gathered or folded to form the channels.
  • the plurality of longitudinally extending channels may be defined by a single sheet that has been pleated, gathered or folded to form multiple channels. The sheet may also have been crimped prior to being pleated, gathered or folded.
  • the plurality of longitudinally extending channels may be defined by multiple sheets that have been crimped, pleated, gathered or folded to form multiple channels.
  • the term ‘crimped’ denotes a sheet having a plurality of substantially parallel ridges or corrugations.
  • the substantially parallel ridges or corrugations extend in a longitudinal direction with respect to the rod.
  • the terms ‘gathered’, ‘pleated’, or ‘folded’ denote that a sheet of material is convoluted, folded, or otherwise compressed or constricted substantially transversely to the cylindrical axis of the rod.
  • a sheet may be crimped prior to being gathered, pleated or folded.
  • a sheet may be gathered, pleated or folded without prior crimping.
  • the additional cooling element preferably offers a low resistance to the passage of air through additional cooling element.
  • the additional cooling element does not substantially affect the resistance to draw of the aerosol-generating article.
  • the porosity in a longitudinal direction is greater than 50 percent and that the airflow path through the additional cooling element is relatively uninhibited.
  • the longitudinal porosity of the additional cooling element may be defined by a ratio of the cross-sectional area of material forming the additional cooling element and an internal cross-sectional area of the aerosol-generating article at the portion containing the additional cooling element.
  • the aerosol-generating article may have an overall length from 45 millimetres to 100 millimetres.
  • an overall length of an aerosol-generating article in accordance with the invention is at least 50 millimetres. More preferably, an overall length of an aerosol-generating article in accordance with the invention is at least 60 millimetres. Even more preferably, an overall length of an aerosol-generating article in accordance with the invention is at least 70 millimetres.
  • an overall length of the aerosol-generating article is preferably from 50 millimetres to 90 millimetres, more preferably from 60 millimetres to 90 millimetres, even more preferably from 70 millimetres to 90 millimetres. In other embodiments, an overall length of the aerosol-generating article is preferably from 50 millimetres to 85 millimetres, more preferably from 60 millimetres to 85 millimetres, even more preferably from 70 millimetres to 85 millimetres. In further embodiments, an overall length of the aerosol-generating article is preferably from 50 millimetres to 80 millimetres, more preferably from 60 millimetres to 80 millimetres, even more preferably from 70 millimetres to 80 millimetres. In an exemplary embodiment, an overall length of the aerosol-generating article is 75 millimetres.
  • one or more of the components of the aerosol-generating article are individually circumscribed by their own wrapper.
  • the rod of aerosol-generating substrate and the downstream filter segment are individually wrapped.
  • the upstream element, the rod of aerosol-generating substrate and the hollow tubular element are then combined together with an outer wrapper. Subsequently, they are combined with the downstream filter segment—which has its own wrapper—by means of tipping paper.
  • At least one of the components of the aerosol-generating article is wrapped in a hydrophobic wrapper.
  • hydrophobic refers to a surface exhibiting water repelling properties.
  • the “water contact angle” is the angle, conventionally measured through the liquid, where a liquid/vapour interface meets a solid surface. It quantifies the wettability of a solid surface by a liquid via the Young equation. Hydrophobicity or water contact angle may be determined by utilizing TAPPI T558 test method and the result is presented as an interfacial contact angle and reported in “degrees” and can range from near zero to near 180 degrees.
  • the hydrophobic wrapper is one including a paper layer having a water contact angle of about 30 degrees or greater, and preferably about 35 degrees or greater, or about 40 degrees or greater, or about 45 degrees or greater.
  • the length of the device cavity is such that at least 90 percent of the length of the rod of aerosol-generating substrate is inserted or received within the device cavity, when the aerosol-generating article is received with the aerosol-generating device. This maximises the length of the rod of aerosol-generating substrate along which the aerosol-generating substrate can be heated during use, thereby optimising the generation of aerosol from the aerosol-generating substrate and reducing tobacco waste.
  • At least 30 percent of the length of the hollow tubular element may be inserted or received within the device cavity, when the aerosol-generating article is received within the device. At least 40 percent of the length of the hollow tubular element may be inserted or received within the device cavity, when the aerosol-generating article is received within the device. At least 50 percent of the length of the hollow tubular element may be inserted or received within the device cavity, when the aerosol-generating article is received within the device.
  • Various lengths of the hollow tubular element are described in more detail within the present disclosure.
  • a diameter of the device cavity may be between 4 millimetres and 10 millimetres.
  • a diameter of the device cavity may be between 5 millimetres and 9 millimetres.
  • a diameter of the device cavity may be between 6 millimetres and 8 millimetres.
  • a diameter of the device cavity may be between 6 millimetres and 7 millimetres.
  • the device cavity may be configured to establish a tight fit with an aerosol-generating article received within the device cavity. Tight fit may refer to a snug fit.
  • the aerosol-generating device may comprise a peripheral wall. Such a peripheral wall may define the device cavity, or heating chamber. The peripheral wall defining the device cavity may be configured to engage with an aerosol-generating article received within the device cavity in a tight fit manner, so that there is substantially no gap or empty space between the peripheral wall defining the device cavity and the aerosol-generating article when received within the device.
  • the aerosol-generating device may comprise an air-flow channel extending between a channel inlet and a channel outlet.
  • the air-flow channel may be configured to establish a fluid communication between the interior of the device cavity and the exterior of the aerosol-generating device.
  • the air-flow channel of the aerosol-generating device may be defined within the housing of the aerosol-generating device to enable fluid communication between the interior of the device cavity and the exterior of the aerosol-generating device.
  • the air-flow channel may be configured to provide air flow into the article in order to deliver generated aerosol to a user drawing from the mouth end of the article.
  • the air-flow channel of the aerosol-generating device may be defined within, or by, the peripheral wall of the housing of the aerosol-generating device.
  • the air-flow channel of the aerosol-generating device may be defined within the thickness of the peripheral wall or by the inner surface of the peripheral wall, or a combination of both.
  • the air-flow channel may partially be defined by the inner surface of the peripheral wall and may be partially defined within the thickness of the peripheral wall.
  • the inner surface of the peripheral wall defines a peripheral boundary of the device cavity.
  • the heater may externally heat the aerosol-generating article when received within the aerosol-generating device.
  • Such an external heater may circumscribe the aerosol-generating article when inserted in or received within the aerosol-generating device.
  • the heater may comprise at least one heating element.
  • the at least one heating element may be any suitable type of heating element.
  • the device comprises only one heating element.
  • the device comprises a plurality of heating elements.
  • the heater may comprise at least one resistive heating element.
  • the heater comprises a plurality of resistive heating elements.
  • the resistive heating elements are electrically connected in a parallel arrangement.
  • providing a plurality of resistive heating elements electrically connected in a parallel arrangement may facilitate the delivery of a desired electrical power to the heater while reducing or minimising the voltage required to provide the desired electrical power.
  • reducing or minimising the voltage required to operate the heater may facilitate reducing or minimising the physical size of the power supply.
  • Suitable materials for forming the at least one resistive heating element 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 and metals from the platinum group.
  • suitable metal alloys include stainless steel, nickel-, cobalt-, chromium-, aluminium-titanium-zirconium-, hafnium-, niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese- and iron-containing alloys, and super-alloys based on nickel, iron, cobalt, stainless steel, Timetal® and iron-manganese-aluminium based alloys.
  • the at least one heating element comprises an electrically insulating substrate, wherein the at least one resistive heating element is provided on the electrically insulating substrate.
  • the electrically insulating substrate may comprise any suitable material.
  • the electrically insulating substrate may comprise one or more of: paper, glass, ceramic, anodized metal, coated metal, and Polyimide.
  • the ceramic may comprise mica, Alumina (Al 2 O 3 ) or Zirconia (ZrO 2 ).
  • the electrically insulating substrate has a thermal conductivity of less than or equal to about 40 Watts per metre Kelvin, preferably less than or equal to about 20 Watts per metre Kelvin and ideally less than or equal to about 2 Watts per metre Kelvin.
  • the heater comprises an inductive heating arrangement.
  • the inductive heating arrangement may comprise an inductor coil and a power supply configured to provide high frequency oscillating current to the inductor coil.
  • a high frequency oscillating current means an oscillating current having a frequency of between about 500 kHz and about 30 MHz.
  • the heater may advantageously comprise a DC/AC inverter for converting a DC current supplied by a DC power supply to the alternating current.
  • the inductor coil may be arranged to generate a high frequency oscillating electromagnetic field on receiving a high frequency oscillating current from the power supply.
  • the inductor coil may be arranged to generate a high frequency oscillating electromagnetic field in the device cavity.
  • the inductor coil may substantially circumscribe the device cavity.
  • the inductor coil may extend at least partially along the length of the device cavity.
  • the heater may comprise an inductive heating element.
  • the inductive heating element may be a susceptor element.
  • susceptor element refers to an element comprising a material that is capable of converting electromagnetic energy into heat. When a susceptor element is located in an alternating electromagnetic field, the susceptor is heated. Heating of the susceptor element may be the result of at least one of hysteresis losses and eddy currents induced in the susceptor, depending on the electrical and magnetic properties of the susceptor material.
  • the susceptor element is preferably located in contact with the aerosol-generating substrate.
  • a susceptor element is located in the aerosol-generating device.
  • the susceptor element may be located in the cavity.
  • the aerosol-generating device may comprise only one susceptor element.
  • the aerosol-generating device may comprise a plurality of susceptor elements.
  • the susceptor element is preferably arranged to heat the outer surface of the aerosol-generating substrate.
  • the susceptor element may comprise a non-metallic core with a metal layer disposed on the non-metallic core.
  • the susceptor element may comprise metallic tracks formed on an outer surface of a ceramic core or substrate.
  • An aerosol-generating article according to example EX3, EX4 or EX5, wherein the tobacco material has a density of at least 100 milligrams per cubic centimetre.
  • An aerosol-generating article according to any preceding example, comprising a downstream section provided downstream of the rod of aerosol-generating substrate.
  • An aerosol-generating article according to example EX9 wherein the downstream section comprises a hollow tubular element abutting a downstream end of the rod of aerosol-generating substrate.
  • EX11 An aerosol-generating article according to example EX10, wherein the hollow tubular element has a length of at least 40 millimetres.
  • EX12 An aerosol-generating article according to example EX9, wherein the downstream section comprises a downstream filter segment.
  • EX14 An aerosol-generating article according to example EX12 or EX13, wherein the downstream filter segment is a solid plug.
  • EX15 An aerosol-generating article according to example EX12 or EX13, wherein the downstream filter segment is a solid plug.
  • EX23 An aerosol-generating article according to example EX9, wherein the downstream section extends to a downstream end of the aerosol-generating article.
  • EX24 An aerosol-generating article according to example EX9 or EX23, wherein the downstream section comprises a hollow tubular cooling element.
  • EX25 An aerosol-generating article according to example EX24, wherein the hollow tubular cooling element has a length of at least 20 millimetres.
  • EX26. An aerosol-generating article according to example EX25, wherein the hollow tubular cooling element has a length of at least 25 millimetres.
  • EX27 An aerosol-generating article according to example EX9, wherein the downstream section extends to a downstream end of the aerosol-generating article.
  • EX24 An aerosol-generating article according to example EX9 or EX23, wherein the downstream section comprises a hollow tubular cooling element.
  • EX25 An aerosol-generating article according to example EX24, wherein the hollow tubular cooling element has a
  • An aerosol-generating article according to any one of examples EX24 to EX26, wherein the hollow tubular cooling element has a length less than or equal to 50 millimetres.
  • EX30 An aerosol-generating article according to any preceding example, wherein the maximum external diameter of the aerosol-generating article is less than 8 millimetres.
  • An aerosol-generating article according to example EX30 wherein the aerosol-generating article has a maximum external diameter between 5 millimetres and 8 millimetres.
  • EX32 An aerosol-generating article according to example EX30 or EX31, wherein the aerosol-generating article has a maximum external diameter less than or equal to 7 millimetres.
  • EX33 An aerosol-generating article according to example EX32, wherein the aerosol-generating article has a maximum external diameter between 5.5 millimetres and 7 millimetres.
  • EX34 An aerosol-generating article according to example EX9, wherein the ratio of the length of the downstream section to the length of the rod of aerosol-generating substrate is at least 1.5.
  • EX35 An aerosol-generating article according to example EX35.
  • FIG. 6 shows a schematic side sectional view of an aerosol-generating article in accordance with the present disclosure
  • FIG. 7 shows a schematic side sectional view of an aerosol-generating article in accordance with the present disclosure
  • FIG. 8 shows a schematic side sectional view of an aerosol-generating article in accordance with the present disclosure
  • FIG. 9 shows a schematic side sectional view of an aerosol-generating article in accordance with the present disclosure.
  • FIG. 10 shows a schematic side sectional view of an aerosol-generating article in accordance with the present disclosure
  • FIG. 11 shows a schematic side sectional view of an aerosol-generating article in accordance with the present disclosure
  • FIG. 13 shows a schematic side sectional view of an aerosol-generating article in accordance with the present disclosure
  • FIG. 14 shows a schematic side sectional view of an aerosol-generating article in accordance with the present disclosure
  • FIG. 15 shows a schematic side sectional view of an aerosol-generating article in accordance with the present disclosure.
  • Aerosol-generating articles shown in all Figures of the present disclosure comprise a rod 12 of aerosol-generating substrate and a downstream section 14 located downstream of the rod 12 of aerosol-generating substrate. Aerosol-generating articles extend from an upstream or distal end 18 to a downstream or mouth end 19 . The downstream or mouth end 19 is defined by the downstream end of the downstream section 14 .
  • the rod 12 of aerosol-generating substrate is circumscribed by a wrapper (not shown), and comprises at least one of the types of aerosol-generating substrate described in the present disclosure, such as plant cut filler, particularly tobacco cut filler, homogenised tobacco, a gel formulation, or a homogenised plant material comprising particles of a plant other than tobacco.
  • plant cut filler particularly tobacco cut filler, homogenised tobacco, a gel formulation, or a homogenised plant material comprising particles of a plant other than tobacco.
  • the rod 12 of the aerosol-generating articles shown in all Figures have an average tobacco density of about 250 mg per cubic centimetre.
  • the downstream section 14 of the aerosol-generating article 10 shown in FIG. 1 comprises a hollow tubular cooling element 22 , a downstream filter segment 24 , and a downstream, or mouth end, hollow tubular element 26 .
  • the hollow tubular cooling element 22 is located immediately downstream of the rod 12 of aerosol-generating substrate. In other words, the hollow tubular cooling element 22 abuts the downstream end of the rod 12 .
  • the downstream filter segment 24 abuts the downstream end of the hollow tubular cooling element 22 and the downstream hollow tubular element 26 abuts the downstream end of the downstream filter segment 24 .
  • the downstream filter segment 24 is therefore located between the hollow tubular cooling element 22 and the downstream hollow tubular element 26 .
  • the downstream end 19 of the article 10 is defined by the downstream end of the downstream hollow tubular element 26 .
  • the length of the rod 12 of aerosol-generating substrate is about 40 mm.
  • the hollow tubular cooling element 22 is provided in the form of a hollow cylindrical tube made of cardboard or cellulose acetate.
  • the hollow tubular cooling segment 22 defines an internal cavity that extends all the way from an upstream end of the hollow tubular cooling element 22 to an downstream end of the hollow tubular cooling element 22 .
  • the internal cavity is substantially empty, and so substantially unrestricted airflow is enabled along the internal cavity.
  • the hollow tubular cooling element 22 may not substantially contribute to the overall RTD of the aerosol-generating article 10 .
  • the length of the hollow tubular cooling element 22 is about 25 mm.
  • the wall thickness of the hollow tubular cooling element 22 is about 250 micrometres ( ⁇ m).
  • the downstream hollow tubular element 26 is provided in the form of a hollow cylindrical tube made of cellulose acetate.
  • the downstream hollow tubular element 26 defines an internal cavity that extends all the way from an upstream end of the downstream hollow tubular element 26 to an downstream end of the downstream hollow tubular element 26 .
  • the internal cavity is substantially empty, and so substantially unrestricted airflow is enabled along the internal cavity.
  • the downstream hollow tubular element 26 does not substantially contribute to the overall RTD of the aerosol-generating article 10 .
  • the length of the downstream hollow tubular element 26 is about 6 mm.
  • the wall thickness of the downstream hollow tubular element 26 is about 1 mm.
  • the second hollow tubular segment 272 is provided in the form of a hollow cylindrical tube made of cellulose acetate.
  • the second hollow tubular segment 272 defines an internal cavity that extends all the way from an upstream end of the second hollow tubular segment 272 to an downstream end of the second hollow tubular segment 272 .
  • the internal cavity is substantially empty, and so substantially unrestricted airflow is enabled along the internal cavity.
  • the second hollow tubular segment 272 does not substantially contribute to the overall RTD of the aerosol-generating article 103 .
  • the length of the second hollow tubular segment 272 is about 10 mm.
  • the wall thickness of the second hollow tubular segment 272 is about 1 mm.
  • the downstream section 14 of the aerosol-generating article 20 shown in FIG. 5 comprises a hollow tubular support element 28 , a cooling element 32 , and a downstream filter segment 24 .
  • the hollow tubular support element 28 is located immediately downstream of the rod 12 of aerosol-generating substrate. In other words, the hollow tubular support element 28 abuts the downstream end of the rod 12 .
  • the cooling element 32 abuts the downstream end of the hollow tubular support element 28 and the downstream filter segment 24 abuts the downstream end of the cooling element 32 .
  • the cooling element 32 is therefore located between the hollow tubular support element 28 and the downstream filter segment 24 .
  • the downstream end 19 of the article 20 is defined by the downstream end of the downstream filter segment 24 .
  • the downstream filter segment 24 comprises a cylindrical plug of cellulose acetate tow.
  • the length of the downstream filter segment 24 is about 7 mm.
  • a maximum external diameter of the aerosol-generating article 20 is about 7.3 mm.
  • the aerosol-generating article 201 shown in FIG. 6 is similar to the aerosol-generating article 20 shown in FIG. 5 and differs in that it further comprises a hollow tubular cooling element 22 and in that the rod 12 of aerosol-generating substrate is shorter.
  • the length of the rod 12 of aerosol-generating substrate is about 12 mm.
  • the hollow tubular cooling element 22 is located immediately downstream of the cooling element 32 and immediately upstream of the downstream filter segment 24 . In other words, the hollow tubular cooling element 22 abuts the cooling element 32 and the downstream filter segment 24 .
  • the aerosol-generating article 202 shown in FIG. 7 is similar to the aerosol-generating article 201 shown in FIG. 6 and differs only in that it further comprises a downstream hollow tubular element 27 .
  • the downstream hollow tubular element 27 abuts the downstream end of the downstream filter segment 24 .
  • the downstream filter segment 24 is therefore located between the hollow tubular cooling element 22 and the downstream hollow tubular element 27 .
  • the downstream end 19 of the article 202 is defined by the downstream end of the downstream hollow tubular element 27 .
  • the aerosol-generating article 30 shown in FIG. 8 comprises a rod 12 of aerosol-generating substrate and a downstream section 14 located downstream of the rod 12 of aerosol-generating substrate. Further, the aerosol-generating article 30 comprises an upstream section 16 located upstream of the rod 12 of aerosol-generating substrate. The distal end 18 of the article 30 is defined by the upstream end of the upstream section 16 .
  • the downstream section 14 of the aerosol-generating article 30 shown in FIG. 8 comprises a hollow tubular cooling element 22 and a downstream filter segment 24 .
  • the hollow tubular cooling element 22 is located immediately downstream of the rod 12 of aerosol-generating substrate. In other words, the hollow tubular cooling element 22 abuts the downstream end of the rod 12 .
  • the downstream filter segment 24 abuts the downstream end of the hollow tubular cooling element 22 .
  • the hollow tubular cooling element 22 is therefore located between the rod 12 and the downstream filter segment 24 .
  • the downstream end 19 of the article 30 is defined by the downstream end of the downstream filter segment 24 .
  • the length of the rod 12 of aerosol-generating substrate is about 25 mm.
  • the hollow tubular cooling element 22 is provided in the form of a hollow cylindrical tube made of cardboard or cellulose acetate.
  • the hollow tubular cooling segment 22 defines an internal cavity that extends all the way from an upstream end of the hollow tubular cooling element 22 to an downstream end of the hollow tubular cooling element 22 .
  • the internal cavity is substantially empty, and so substantially unrestricted airflow is enabled along the internal cavity.
  • the hollow tubular cooling element 22 may not substantially contribute to the overall RTD of the aerosol-generating article 30 .
  • the length of the hollow tubular cooling element 22 is about 21 mm.
  • the wall thickness of the hollow tubular cooling element 22 is about 250 micrometres ( ⁇ m).
  • the downstream filter segment 24 comprises a cylindrical plug of cellulose acetate tow.
  • the length of the downstream filter segment 24 is about 7 mm.
  • the upstream section 16 comprises an upstream element 341 abutting the upstream end of the rod 12 .
  • the upstream element 341 is provided in the form of a cylindrical plug of cellulose acetate tow.
  • the length of the upstream element 341 is about 5 mm.
  • the aerosol-generating article 30 comprises a ventilation zone 36 provided at a location along the hollow tubular cooling element 22 .
  • the ventilation zone 36 comprises at least one circumferential row of perforations extending through the peripheral wall of the hollow tubular cooling element 22 and any wrapper (not shown) circumscribing the hollow tubular cooling element 22 .
  • the ventilation zone 36 is provided at about 2 millimetres from the downstream end of the hollow tubular cooling element 22 .
  • the aerosol-generating article 40 shown in FIG. 12 comprises a rod 12 of aerosol-generating substrate and a downstream section 14 located downstream of the rod 12 of aerosol-generating substrate. Further, the aerosol-generating article 40 comprises an upstream section 16 located upstream of the rod 12 of aerosol-generating substrate. The distal end 18 of the article is defined by the upstream end of the upstream section 16 .
  • the downstream filter segment 24 comprises a cylindrical plug of cellulose acetate tow.
  • the length of the downstream filter segment 24 is about 12 mm.
  • the aerosol-generating article 403 shown in FIG. 15 is similar to the aerosol-generating article 402 shown in FIG. 14 and differs in that the ventilation zone 36 is provided along the downstream hollow tubular element 27 .
  • the ventilation zone 36 is provided at about 2 millimetres from the upstream end of the downstream hollow tubular element 27 .
  • the ventilation zone 36 comprises at least one circumferential row of perforations extending through the peripheral wall of the downstream hollow tubular element 27 and any wrapper (not shown) circumscribing the downstream hollow tubular element 27 .
  • FIG. 16 illustrates an aerosol-generating system 1 comprising an exemplary aerosol-generating device 50 and an aerosol-generating article according to any one shown in FIGS. 1 to 15 and described above.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacture Of Tobacco Products (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
US18/853,634 2022-04-12 2023-04-12 Aerosol-generating article with downstream section Pending US20250228285A1 (en)

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EP22168019.2 2022-04-12
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PCT/EP2023/059530 WO2023198760A1 (en) 2022-04-12 2023-04-12 Aerosol-generating article with downstream section

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WO2026008728A2 (en) * 2024-07-05 2026-01-08 Philip Morris Products S.A. Aerosol-generating article with distal end recess
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IL286981B2 (en) * 2019-04-08 2025-06-01 Philip Morris Products Sa Aerosol-generating substrate comprising an aerosol-generating film
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WO2023198760A1 (en) 2023-10-19
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