WO2024017791A1 - Article de génération d'aérosol avec enveloppe épaisse - Google Patents

Article de génération d'aérosol avec enveloppe épaisse Download PDF

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Publication number
WO2024017791A1
WO2024017791A1 PCT/EP2023/069642 EP2023069642W WO2024017791A1 WO 2024017791 A1 WO2024017791 A1 WO 2024017791A1 EP 2023069642 W EP2023069642 W EP 2023069642W WO 2024017791 A1 WO2024017791 A1 WO 2024017791A1
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WO
WIPO (PCT)
Prior art keywords
aerosol
millimeters
forming substrate
percent
generating article
Prior art date
Application number
PCT/EP2023/069642
Other languages
English (en)
Inventor
Enrico Binassi
Gianpaolo D'AMBRA
Valerio D'AMBROGI
Enrico PIETROBUONI
Matteo BALBONI
Luca DINI
Original Assignee
Philip Morris Products S.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philip Morris Products S.A. filed Critical Philip Morris Products S.A.
Publication of WO2024017791A1 publication Critical patent/WO2024017791A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A24D1/02—Cigars; Cigarettes with special covers
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A24D1/20—Cigarettes specially adapted for simulated smoking devices

Definitions

  • the present disclosure relates to an aerosol-generating article.
  • the present disclosure further relates to an aerosol-generating system.
  • an aerosol-generating device for generating an inhalable vapor.
  • Such devices may heat an aerosol-forming substrate contained in an aerosol-generating article without burning the aerosol-forming substrate.
  • the aerosol-generating article may have a rod shape for insertion of the aerosol-generating article into a heating chamber of the aerosol-generating device.
  • the aerosol-generating device may comprise a heating arrangement.
  • the heating arrangement may be an induction heating arrangement and may comprise an induction coil configured to inductively heat a susceptor.
  • the susceptor may be part of the device or may be part of the aerosol-generating article.
  • an aerosol-generating article may comprise an aerosol-forming substrate in an aerosol-forming substrate portion.
  • the aerosol-generating article may comprise a substrate wrapper at least partly circumscribing the aerosol-forming substrate portion.
  • the substrate wrapper may have a thickness of 50 micrometers or more. It may be that the substrate wrapper does not extend beyond ends of the aerosol-forming substrate portion in a longitudinal direction of the aerosol-generating article.
  • the aerosol-forming substrate may comprise an aerosol former content of at least 35 percent by weight.
  • an aerosol-generating article comprising an aerosol-forming substrate in an aerosolforming substrate portion.
  • the aerosol-generating article comprises a substrate wrapper at least partly circumscribing the aerosol-forming substrate portion.
  • the substrate wrapper has a thickness of 50 micrometers or more. The substrate wrapper does not extend beyond ends of the aerosol-forming substrate portion in a longitudinal direction of the aerosol-generating article.
  • the aerosol-forming substrate comprises an aerosol former content of at least 35 percent by weight.
  • an efficient aerosol-generating article may be provided while not changing the external diameter of the aerosol-generating article.
  • a peripheral portion of the aerosol-forming substrate may be substituted by wrapper material of the thick wrapper while not changing the external diameter of the aerosolgenerating article.
  • the thicker wrapper may compensate for a thinner diameter of the aerosol-forming substrate portion such that the external diameter of the aerosol-generating article is not reduced.
  • the most outer peripheral portion of the aerosol-forming substrate may not be satisfactorily heated when the aerosol-generating article is heated by an internal heating element due to the distance to the heating element and limited thermal transfer.
  • the non-satisfactorily heated portion of aerosol-forming substrate may not heat up sufficiently during use to participate in aerosolization.
  • the thick wrapper may advantageously replace the non-satisfactorily heated portion of aerosol-forming substrate. An amount of aerosolforming substrate may thus be saved. A more efficient aerosol-generating article may be provided.
  • the aerosol-forming substrate comprising an aerosol former content of at least 35 percent by weight may allow for a smaller total amount of aerosol-forming substrate to be required when compared to an aerosol-forming substrate comprising less aerosol former.
  • the aerosol-forming substrate comprising an aerosol former content of at least 35 percent by weight may more easily form an aerosol in comparison to an article comprising an aerosol-forming substrate with a lower aerosol-former content. This may allow to operate the aerosol-generating article at a lower temperature. A more energy-efficient article may be provided.
  • the thick wrapper may reduce the diameter of the aerosol-forming portion circumscribed by the thick wrapper.
  • the thick wrapper may reduce the inner volume of the aerosol-forming portion circumscribed by the thick wrapper.
  • the reduced diameter of the aerosol-forming portion may improve the thermal contact between the aerosol-forming substrate and a susceptor provided in the aerosol-forming substrate portion. A more efficient aerosol-generating article may be provided.
  • the aerosol-forming substrate comprising an aerosol former content of at least 35 percent by weight may require lower aerosolization temperatures when compared to an aerosol-forming substrate comprising less aerosol former.
  • a more energy efficient aerosolgenerating article may be provided. Lower temperatures may also reduce the risk of aerosolization of potentially undesired components.
  • the thick wrapper may be more resilient against leakage of liquid or viscous components of the aerosol-forming substrate, in particular aerosol formers, when compared to a thinner wrapper.
  • a mechanically more stable aerosol-generating article may be provided, particularly for heat-not-burn aerosol-forming substrates that contain a high level of liquids or aerosol formers.
  • the thick wrapper being resilient against leakage may be more rigid than a conventional thin wrapper.
  • a thinner wrapper may lose its stability more quickly when being soaked with liquid.
  • a mechanically more robust aerosol-generating article may be provided, particularly in combination with the aerosol-forming substrate comprising an aerosol former content of at least 35 percent by weight.
  • a mechanically more robust aerosol-generating article may be particularly advantageous when the aerosol-generating article is arranged to be inserted into a heating chamber of an aerosol-generating device.
  • an aerosol-generating article which can be used with existing aerosol-generating devices may be provided.
  • the substrate wrapper may have a thickness of 60 micrometers or more, preferably
  • micrometers or more more preferably 75 micrometers or more, more preferably 80 micrometers or more, more preferably 90 micrometers or more, more preferably 100 micrometers or more, more preferably 110 micrometers or more, more preferably 120 micrometers or more, more preferably 130 micrometers or more, more preferably
  • the substrate wrapper may have a thickness of about
  • the substrate wrapper may have a thickness of between 143 micrometers and 153 micrometers.
  • the substrate wrapper may have a thickness of between 140 micrometers and 160 micrometers.
  • the substrate wrapper may have a uniform thickness that does not differ at any point by more than about 30 micrometers, or more than about 20 micrometers, or more than about 10 micrometers, or more than about 5 micrometers, or more than about 2 micrometers.
  • the ratio of substrate wrapper thickness to aerosol-forming substrate portion diameter may be in a range from about 1 :120 to about 1:20, or about 1 :100 to about 1:30, or about 1 :80 to about 1 :35, or about 1 :60 to about 1 :40.
  • the term “aerosol-forming substrate” refers to a substrate capable of releasing volatile compounds that can form an aerosol. Such volatile compounds may be released by heating the aerosol-forming substrate.
  • the aerosol-forming substrate may be in solid form or may be in liquid form.
  • the aerosol-forming substrate may be solid or liquid or may comprise both solid and liquid components.
  • An aerosol-forming substrate may be part of an aerosol-generating article.
  • the terms ‘aerosol’ and ‘vapor’ are used synonymously.
  • the aerosol-forming substrate may comprise one or more of: tobacco, nicotine, an aerosol-forming film, a gel composition, and a flavour agent.
  • the aerosol-forming substrate comprises at least 35 percent by weight of one or more aerosol formers.
  • the aerosol-forming substrate comprises at least 35 percent by weight of one or more aerosol formers on a dry weight basis of the aerosol-forming substrate. Unless defined otherwise, all percentages by weight described herein are on a dry weight basis.
  • 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.
  • Suitable aerosol formers are for example: polyhydric alcohols such as, for example, triethylene glycol, 1 ,3-butanediol, propylene glycol and glycerine; esters of polyhydric alcohols such as, for example, glycerol mono-, di- or triacetate; aliphatic esters of mono-, di- or polycarboxylic acids such as, for example, dimethyl dodecanedioate and dimethyl tetradecanedioate; and combinations thereof.
  • the one or more aerosol formers comprise one or both of glycerol and propylene glycol.
  • the one or more aerosol formers may consist of one or both of glycerol and propylene glycol.
  • the aerosol-forming substrate comprises glycerol.
  • glycerine and “glycerol” are used synonymously herein.
  • the aerosol-forming substrate may comprise less than or equal to 80 percent by weight of aerosol former on a dry weight basis of the aerosol-forming substrate.
  • the aerosolforming substrate may comprise less than or equal to 60 percent by weight of aerosol former on a dry weight basis of the aerosol-forming substrate.
  • the aerosol-forming substrate may comprise less than or equal to 40 percent by weight of aerosol former on a dry weight basis of the aerosol-forming substrate.
  • the aerosol-forming substrate may comprise between 35 percent and 80 percent, or between 35 percent and 60 percent, or between 35 percent and 55 percent, or between 35 percent and 50 percent, or between 35 percent and 40 percent by weight of aerosol former on a dry weight basis of the aerosol-forming substrate.
  • the total aerosol former content of the aerosol-forming substrate may be at least 40 percent by weight, preferably at least 45 percent by weight, more preferably at least 50 percent by weight, more preferably at least 55 percent by weight.
  • the total aerosol former content of the aerosol-forming substrate may be between 35 percent by weight and 75 percent by weight, preferably between 40 percent by weight and 60 percent by weight, more between 45 percent by weight and 55 percent by weight.
  • the aerosol-forming substrate may comprise nicotine.
  • the aerosol-forming substrate may comprise one or more carboxylic acids.
  • the aerosol-forming substrate may comprise nicotine, one or more cellulose based agents, one or more aerosol formers, and one or more carboxylic acids.
  • the one or more carboxylic acids may be selected from fumaric acid, maleic acid, and malic acid.
  • the one or more carboxylic acids may be selected from fumaric acid and maleic acid.
  • the one or more carboxylic acids may be fumaric acid.
  • the one or more carboxylic acids may have a pKa at 25°C in water of less than or equal to 3.5.
  • the aerosolforming substrate may comprise one or more carboxylic acids selected from acetic acid, benzoic acid, lactic acid, and levulinic acid.
  • the aerosol-forming substrate may have a total cellulose based agent content of between 35 percent by weight and 50 percent by weight.
  • the aerosol-forming substrate may comprise one or more cellulose based film-forming agents selected from carboxymethyl cellulose and hydroxypropyl methylcellulose.
  • the aerosol-forming substrate may comprise one or more cellulose based strengthening agents selected from cellulose fibres, microcrystalline cellulose and cellulose powder.
  • the aerosol-forming substrate may be an aerosol-forming film.
  • the aerosol-forming substrate may be a solid aerosol-forming film.
  • the solid aerosol-forming film may be solid at room temperature.
  • the solid aerosol-forming film may remain solid when heated to a temperature of between 180 degrees Celsius and 350 degrees Celsius.
  • the aerosol-forming substrate may be provided in form of a gel.
  • the aerosol-forming substrate may be substantially tobacco-free.
  • the aerosolforming substrate may be tobacco-free.
  • the aerosol-forming substrate may comprise one or more carboxylic acids and the aerosol-forming substrate may have a total carboxylic acid content of greater than or equal to 0.5 percent by weight.
  • the aerosol-forming substrate may not comprise iota-carrageenan or kappa-carrageenan.
  • the aerosol-forming substrate may be a solid aerosol-forming substrate.
  • solid is used to describe an aerosol-forming substrate that has a stable size and shape and does not flow at room temperature - room temperature is about 23 degree Celsius.
  • the aerosol-forming substrate may remain solid when heated to a temperature of between 180 degrees Celsius and 350 degrees Celsius, between 200 degrees Celsius and 320 degrees Celsius, between 220 degrees Celsius and 300 degrees Celsius, or between 240 degrees Celsius and 280 degrees Celsius.
  • the aerosol-forming substrate may be an aerosol-forming film.
  • the term “film” is used to describe a solid laminar element having a thickness that is less than the width or length thereof.
  • the film may be self-supporting.
  • a film may have cohesion and mechanical properties such that the film, even if obtained by casting a film-forming formulation on a support surface, can be separated from the support surface.
  • the film may be disposed on a support or sandwiched between other materials. This may enhance the mechanical stability of the film.
  • the solid aerosol-forming substrate may be a solid aerosol-forming film.
  • the aerosol-forming film comprises one or more aerosol formers as described herein, preferably the aerosol-former comprises glycerine, or is glycerine.
  • the aerosol-forming film may have an aerosol former content of at least 35 percent by weight on a dry weight basis.
  • the aerosol-forming film has an aerosol former content of at least 40 percent by weight on a dry weight basis. More preferably, the aerosol-forming film has an aerosol former content of at least 45 percent by weight on a dry weight basis. More preferably, the aerosolforming film has an aerosol former content of at least 50 percent by weight on a dry weight basis.
  • the aerosol-forming film has an aerosol former content of no more than 80 percent by weight on a dry weight basis. More preferably, aerosol-forming film has an aerosol former content of no more than 75 percent by weight on a dry weight basis. More preferably, the aerosol-forming film has an aerosol former content of no more than 70 percent by weight on a dry weight basis.
  • the aerosol-forming substrate may be in the form of an aerosol-forming film comprising a cellulosic based film forming agent, nicotine and an aerosol former.
  • the aerosol-forming film may further comprise a cellulose based strengthening agent.
  • the aerosol-forming film may further comprise water, preferably 30 percent by weight of less of water.
  • the term “thickness” is used to describe the minimum dimension between opposite, substantially parallel surfaces of a solid aerosol-forming film.
  • the solid aerosol-forming film may have a thickness of greater than or equal to 0.05 millimeters, greater than or equal to 0.1 millimeters, greater than or equal to 0.2 millimeters, or greater than or equal to 0.3 millimeters.
  • the solid aerosol-forming film may have a thickness of less than or equal to 1.2 millimeters, less than or equal to 1 millimeter, less than or equal to 0.8 millimeters, less than or equal to 0.6 millimeters, or less than or equal to 0.4 millimeters.
  • the solid aerosol-forming film may have a basis weight of greater than or equal to 85 grams per square meter, greater than or equal to 100 grams per square meter, greater than or equal to 120 grams per square meter, or greater than or equal to 140 grams per square meter.
  • the solid aerosol-forming film may have a basis weight of less than or equal to 300 grams per square meter, less than or equal to 280 grams per square meter, or less than or equal to 260 grams per square meter.
  • the solid aerosol-forming film may be formed by any suitable method.
  • the solid aerosol-forming film may be formed by batch casting, continuous casting or extrusion.
  • the solid aerosol-forming film may be self-supporting.
  • the properties of the solid aerosol-forming film may be such that, even if the solid aerosol-forming film is formed by casting a slurry onto a support surface, the solid aerosol-forming film can be separated from the support surface.
  • the solid aerosol-forming film may be disposed on a support or the solid aerosolforming film may be sandwiched between other materials. This may enhance the mechanical stability of the solid aerosol-forming film.
  • the solid aerosol-forming film may be disposed on a laminar support.
  • the solid aerosol-forming film may be cut or otherwise divided into a plurality of strips or shreds that may be wrapped to form the aerosol-forming portion wrapped by the substrate wrapper.
  • the solid aerosol-forming film may be gathered before insertion into the aerosolforming portion.
  • the solid aerosol-forming film may be textured. This may facilitate gathering of the solid aerosol-forming film before insertion into the aerosol-forming portion.
  • Textured solid aerosol-forming film may comprise a plurality of spacedapart indentations, protrusions, perforations or a combination thereof.
  • the solid aerosol-forming film may be crimped.
  • crimped is intended to be synonymous with the term “creped” and is used to describe a solid aerosol-forming film having a plurality of substantially parallel ridges or corrugations.
  • the solid aerosol-forming film may be incorporated directly into the aerosol-forming portion.
  • the solid aerosol-forming film may be applied to a laminar support before being incorporated into the aerosol-forming portion.
  • the solid aerosol-forming film may be applied to the surface of a sheet material.
  • Suitable sheet materials for use as the laminar support include, but are not limited, to: paper; cardboard; and homogenised plant material.
  • the solid aerosol-forming film may be applied to a paper sheet, an aluminium coated paper sheet, or a polyethylene coated paper sheet.
  • the laminar support with the solid aerosol-forming film applied thereto may be cut or otherwise divided into a plurality of strips or shreds as described above.
  • the laminar support with the solid aerosol-forming film applied thereto may be gathered as described above.
  • the laminar support with the solid aerosol-forming film applied thereto may be textured as described above.
  • aerosol former is used to describe a compound that, in use, facilitates formation of the aerosol, and that preferably is substantially resistant to thermal degradation at the operating temperature of an aerosolgenerating article or aerosol-generating system comprising the solid aerosol-forming substrate.
  • suitable aerosol formers include: polyhydric alcohols, such as 1,3- butanediol, glycerine, 1 ,3-propanediol, propylene glycol, and triethylene glycol; 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.
  • polyhydric alcohols such as 1,3- butanediol, glycerine, 1 ,3-propanediol, propylene glycol, and triethylene glycol
  • esters of polyhydric alcohols such as glycerol mono-, di- or triacetate
  • aliphatic esters of mono-, di- or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate.
  • the aerosol-forming substrate has a total aerosol former content of greater than or equal to 35 percent by weight.
  • the aerosol-forming substrate may have a total aerosol former content of greater than or equal to 40 percent by weight, or greater than or equal to 45 percent by weight, or greater than or equal to 50 percent by weight.
  • total aerosol former content is used to describe the combined content of all aerosol formers in the aerosol-forming substrate.
  • the solid aerosol-forming substrate may have a total aerosol former content of greater than or equal to 46 percent by weight, greater than or equal to 48 percent by weight, greater than or equal to 50 percent by weight, or greater than or equal to 52 percent by weight.
  • the solid aerosol-forming substrate may have a total aerosol former content of less than or equal to 62 percent by weight, less than or equal to 60 percent by weight, less than or equal to 58 percent by weight, less than or equal to 56 percent by weight, or less than or equal to 54 percent by weight.
  • the solid aerosol-forming substrate may have a total aerosol former content of between 42 percent by weight and 62 percent by weight, between 46 percent by weight and 60 percent by weight, between 46 percent by weight and 58 percent by weight, between 46 percent by weight and 56 percent by weight, or between 46 percent by weight and 54 percent by weight.
  • the solid aerosol-forming substrate comprises one or more polyhydric alcohols.
  • the solid aerosol-forming substrate may have a total polyhydric alcohol content of greater than or equal to 45 percent by weight, greater than or equal to 46 percent by weight, greater than or equal to 48 percent by weight, greater than or equal to 50 percent by weight, or greater than or equal to 52 percent by weight.
  • the solid aerosol-forming substrate comprises one or more polyhydric alcohols selected from 1 ,3-butanediol, glycerine, 1,3-propanediol, propylene glycol, and triethylene glycol.
  • the solid aerosol-forming substrate comprises one or more polyhydric alcohols selected from glycerine and propylene glycol. Most preferably, the solid aerosol-forming substrate comprises glycerine.
  • the solid aerosol-forming substrate may comprise one or more carboxylic acids having a pKa at 25°C in water of less than or equal to 3.5.
  • carboxylic acids having a pKa at 25°C in water of less than or equal to 3.5 is used to describe monoprotic carboxylic acids having a pKa at 25°C in water of less than or equal to 3.5 and polyprotic carboxylic acids having a pKa1 at 25°C in water of less than or equal to 3.5.
  • the solid aerosol-forming substrate may have a total carboxylic acid content of greater than or equal to 1 percent by weight, greater than or equal to 1.5 percent by weight, or greater than or equal to 2 percent by weight.
  • the solid aerosol-forming substrate may have a total carboxylic acid content of less than or equal to 8 percent by weight, less than or equal to 6 percent by weight, or less than or equal to 4 percent by weight.
  • the solid aerosol-forming substrate may have a total carboxylic acid content of between 0.5 percent by weight and 8 percent by weight, between 1 percent by weight and 6 percent by weight, or between 2 percent by weight and 4 percent by weight.
  • the molar ratio of total carboxylic acid to nicotine in the solid aerosol-forming substrate may be between 0.5:1 and 5:1, between 0.5:1 and 4.5:1, between 0.5:1 and 4:1 , or between 0.5:1 and 3.5:1.
  • the solid aerosol-forming substrate may comprise one or more cellulose based agents.
  • cellulose based agent is used to describe a cellulosic substance.
  • cellulose based film-forming agent may be used to describe a cellulosic polymer capable, by itself or in the presence of an auxiliary thickening agent, of forming a continuous film.
  • cellulose based agents include cellulose based film-forming agents, cellulose based strengthening agents and cellulose based binding agents.
  • total cellulose based agent is used to describe the combined content of all cellulose based agents in the solid aerosolforming substrate.
  • the term “total cellulose based agent content” describes the combined cellulose based film-forming agent content, cellulose based strengthening agent content, and cellulose based binding agent content of the solid aerosol-forming substrate.
  • the solid aerosol-forming substrate may have a total cellulose based agent content of greater than or equal to 25 percent by weight, or greater than or equal to 30 percent by weight. Preferably, the solid aerosol-forming substrate has a total cellulose based agent content of greater than or equal to 35 percent by weight.
  • the solid aerosol-forming substrate may have a total cellulose based agent content of greater than or equal to 36 percent by weight, greater than or equal to 38 percent by weight, or greater than or equal to 40 percent by weight.
  • the solid aerosol-forming substrate may have a total cellulose based agent content of less than or equal to 52 percent by weight, less than or equal to 50 percent by weight, less than or equal to 48 percent by weight, less than or equal to 46 percent by weight, or less than or equal to 44 percent by weight.
  • the solid aerosol-forming substrate may have a total cellulose based agent content of between 35 percent by weight and 52 percent by weight, between 35 percent by weight and 50 percent by weight, between 35 percent by weight and 48 percent by weight, between 35 percent by weight and 46 percent by weight, or between 35 percent by weight and 44 percent by weight.
  • the solid aerosol-forming substrate may comprise one or more cellulose based filmforming agents.
  • cellulose based film-forming agent is used to describe a cellulosic polymer capable, by itself or in the presence of an auxiliary thickening agent, of forming a continuous film.
  • the solid aerosol-forming substrate may comprise one or more cellulose based film-forming agents selected from carboxymethyl cellulose (CMC), ethylcellulose (EC), hydroxyethyl cellulose (HEC), hydroxyethyl methylcellulose (HEMC), hydroxypropyl cellulose (HPC), hydroxypropyl methylcellulose (HPMC), and methylcellulose (MC).
  • CMC carboxymethyl cellulose
  • EC ethylcellulose
  • HEC hydroxyethyl cellulose
  • HEMC hydroxyethyl methylcellulose
  • HPMC hydroxypropyl methylcellulose
  • MC methylcellulose
  • the solid aerosol-forming substrate comprises carboxymethyl cellulose (CMC) and hydroxypropyl methylcellulose (HPMC).
  • the cellulose based film-forming agent is selected from the group consisting of hydroxypropyl methylcellulose (HPMC), methylcellulose (MC), ethylcellulose (EC), hydroxyethyl methyl cellulose (HEMC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), and combinations thereof.
  • HPMC hydroxypropyl methylcellulose
  • MC methylcellulose
  • EC ethylcellulose
  • HEMC hydroxyethyl methyl cellulose
  • HEC hydroxyethyl cellulose
  • HPC hydroxypropyl cellulose
  • the cellulose based film-forming agent is selected from the group consisting of hydroxypropyl methylcellulose (HPMC), methylcellulose (MC), ethylcellulose (EC), and combinations thereof.
  • the cellulose based film-forming agent is HPMC.
  • the one or more cellulose based film-forming agents may act as a binding agent for the solid aerosol-forming substrate.
  • the solid aerosol-forming substrate may have a total cellulose based film-forming agent content of greater than or equal to 15 percent by weight, greater than or equal to 20 percent by weight, or greater than or equal to 25 percent by weight.
  • the solid aerosol-forming substrate may have a total cellulose based film-forming agent content of less than or equal to 40 percent by weight, less than or equal to 35 percent by weight, or less than or equal to 30 percent by weight.
  • the solid aerosol-forming substrate may have a total cellulose based film-forming agent content of between 10 percent by weight and 40 percent by weight, between 15 percent by weight and 35 percent by weight, or between 15 percent by weight and 30 percent by weight.
  • the aerosol-forming film may have a cellulose based film-forming agent content of between 10 percent and 40 percent by weight, or between 15 percent and 35 percent by weight, or between 20 percent and 30 percent by weight, on a dry weight basis.
  • the solid aerosol-forming substrate may comprise one or more cellulose based strengthening agents.
  • inclusion of one or more cellulose based strengthening agents in the solid aerosolforming substrate may advantageously increase the tensile strength of the solid aerosolforming substrate.
  • inclusion of one or more cellulose based strengthening agents in the solid aerosol-forming substrate may advantageously increase the tensile strength of the solid aerosol-forming film.
  • a solid aerosol-forming substrate having a higher tensile strength may advantageously be less likely to deteriorate or break during manufacture and storage.
  • the solid aerosol-forming substrate may comprise one or more cellulose based strengthening agents selected from cellulose fibres, cellulose powder, and microcrystalline cellulose (MCC).
  • the cellulose based strengthening agent is selected from the group consisting of cellulose fibres, microcrystalline cellulose (MCC), cellulose powder, and combinations thereof.
  • the solid aerosol-forming substrate comprises cellulose fibres.
  • Cellulose fibres may be particularly effective at increasing the tensile strength of the solid aerosolforming substrate.
  • the aerosol-forming film may have a cellulose based strengthening agent content of between 0.5 percent and 40 percent by weight on a dry weight basis, or between 5 percent and 30 percent by weight on a dry weight basis, or between 10 percent and 25 percent by weight on a dry weight basis.
  • the solid aerosol-forming substrate may have a total cellulose based strengthening agent content of greater than or equal to 5 percent by weight, greater than or equal to 10 percent by weight, or greater than or equal to 15 percent by weight.
  • total cellulose based strengthening agent content is used to describe the combined content of all cellulose based strengthening agents in the solid aerosol-forming substrate.
  • the solid aerosol-forming substrate may have a total cellulose based strengthening agent content of less than or equal to 30 percent by weight, less than or equal to 25 percent by weight, or less than or equal to 20 percent by weight.
  • the solid aerosol-forming substrate may have a total cellulose based strengthening agent content of between 5 percent by weight and 30 percent by weight, between 5 percent by weight and 25 percent by weight, or between 5 percent by weight and 20 percent by weight.
  • the aerosol-forming film may further comprise a carboxymethyl cellulose, preferably sodium carboxymethyl cellulose.
  • the aerosol-forming film may have a carboxymethyl cellulose content of between 1 percent and 15 percent by weight, or between 2 percent and 12 percent by weight, or between 4 percent and 10 percent by weight on a dry weight basis.
  • the solid aerosol-forming substrate may comprise water.
  • the solid aerosol-forming substrate may have a water content of greater than or equal to 5 percent by weight, greater than or equal to 10 percent by weight, greater than or equal to 15 percent by weight, or greater than or equal to 17 percent by weight based on the total weight of the solid aerosol-forming substrate.
  • the solid aerosol-forming substrate may have a water content of less than or equal to 35 percent by weight, less than or equal to 30 percent by weight, or less than or equal to 25 percent by weight based on the total weight of the solid aerosol-forming substrate.
  • the solid aerosol-forming substrate may have a water content of between 5 percent by weight and 35 percent by weight, between 5 percent by weight and 30 percent by weight, or between 5 percent by weight and 25 percent by weight based on the total weight of the solid aerosol-forming substrate.
  • the solid aerosol-forming substrate may comprise one or more non-cellulose based thickening agents.
  • non-cellulose based thickening agent is used to describe a non-cellulosic substance that, when added to an aqueous or non-aqueous liquid composition, increases the viscosity of the liquid composition without substantially modifying its other properties.
  • the one or more non-cellulose based thickening agents may increase stability, and improve suspension of components in the liquid composition.
  • a thickening agent may also be referred to as a “thickener” or a “rheology modifier” or “viscosifying agent”.
  • the solid aerosol-forming substrate may comprise one or more non-cellulose based thickening agents selected from alginates, gellan gum, guar gum, gum arabic, locust bean gum, pectins, starches, and xanthan gum.
  • the solid aerosol-forming substrate may have a total non-cellulose based thickening agent content of greater than or equal to 1 percent by weight, greater than or equal to 2 percent by weight, or greater than or equal to 3 percent by weight.
  • the solid aerosol-forming substrate may have a total non-cellulose based thickening agent content of less than or equal to 10 percent by weight, less than or equal to 8 percent by weight, or less than or equal to 6 percent by weight.
  • the solid aerosol-forming substrate may have a total non-cellulose based thickening agent content of between 1 percent by weight and 10 percent by weight, between 1 percent by weight and 8 percent by weight, or between 1 percent by weight and 6 percent by weight.
  • the solid aerosol-forming substrate may comprise one or more flavourants.
  • Suitable flavourants are known in the art and include, but are not limited to, menthol.
  • menthol is used to describe the compound 2-isopropyl-5-methylcyclohexanol in any of its isomeric forms.
  • the solid aerosol-forming substrate may have a total flavourant content of greater than or equal to 0.5 percent by weight, greater than or equal to 1 percent by weight, greater than or equal to 2 percent by weight, or greater than or equal to 3 percent by weight.
  • the solid aerosol-forming substrate may have a total flavourant content of less than or equal to 6 percent by weight, less than or equal to 5 percent by weight, or less than or equal to 4 percent by weight.
  • the solid aerosol-forming substrate may have a total flavourant content of between 0.5 percent by weight and 6 percent by weight, between 0.5 percent by weight and 5 percent by weight, or between 0.5 percent by weight and 4 percent by weight.
  • the solid aerosol-forming substrate may have a total flavourant content of between 1 percent by weight and 6 percent by weight, between 1 percent by weight and 5 percent by weight, or between 1 percent by weight and 4 percent by weight.
  • the solid aerosol-forming substrate may be a substantially tobacco-free solid aerosolforming substrate.
  • the term “substantially tobacco-free solid aerosol-forming substrate” is used to describe a solid aerosol-forming substrate having a tobacco content of less than 1 percent by weight.
  • the solid aerosol-forming substrate may have a tobacco content of less than 0.75 percent by weight, less than 0.5 percent by weight, or less than 0.25 percent by weight.
  • the solid aerosol-forming substrate may be a tobacco-free aerosol-forming film.
  • tobacco-free solid aerosolforming substrate is used to describe a solid aerosol-forming substrate having a tobacco content of 0 percent by weight.
  • the aerosol-forming film preferably comprises nicotine.
  • the term “nicotine” is used to describe nicotine, a nicotine base or a nicotine salt.
  • the amounts of nicotine recited herein are the amount of free base nicotine or amount of protonated nicotine, respectively.
  • the aerosol-forming film may comprise natural nicotine or synthetic nicotine.
  • the nicotine-containing aerosol-forming substrate may be a nicotine salt matrix.
  • the aerosol-forming film may comprise one or more monoprotic nicotine salts.
  • monoprotic nicotine salt is used to describe a nicotine salt of a monoprotic acid.
  • the aerosol-forming film comprises at least 0.5 percent by weight of nicotine on a dry weight basis. More preferably, the aerosol-forming film comprises at least 1 percent by weight of nicotine on a dry weight basis. Even more preferably, the aerosolforming film comprises at least 2 percent by weight of nicotine on a dry weight basis. In addition, or as an alternative, the aerosol-forming film preferably comprises less than 10 percent by weight of nicotine on a dry weight basis. More preferably, the aerosol-forming film comprises less than 8 percent by weight of nicotine on a dry weight basis. More preferably, the aerosol-forming film comprises less than 6 percent by weight of nicotine on a dry weight basis.
  • the aerosol-forming film may comprise between 0.5 percent and 10 percent by weight of nicotine, or between 1 percent and 8 percent by weight of nicotine, or between 2 percent and 6 percent by weight of nicotine, on a dry weight basis.
  • the aerosol-forming film may be a substantially tobacco-free aerosol-forming film.
  • the aerosol-forming film comprises an acid. More preferably, the aerosol-forming film comprises one or more organic acids. Even more preferably, the aerosol-forming film comprises one or more carboxylic acids. In particularly preferred embodiments, the acid is lactic acid, benzoic acid, fumaric acid or levulinic acid.
  • the aerosol-forming film comprises between 0.25 percent and 3.5 percent by weight of an acid, or between 0.5 percent and 3 percent by weight of an acid, or between 1 percent and 2.5 percent by weight of an acid, on a dry weight basis.
  • the aerosol-forming film may have a thickness from about 0.1 millimeter to about 1 millimeter, more preferably from about 0.1 millimeter to about 0.75 millimeter, even more preferably from about 0.1 millimeter to about 0.5 millimeter.
  • a layer of the film-forming composition is formed that has a thickness from about 50 micrometers to 400 micrometers, more preferably from about 100 micrometers to 200 micrometers.
  • the aerosol-forming film may optionally be provided on a suitable carrier element.
  • the aerosol-forming substrate may comprise a gel composition
  • the aerosol-forming substrate may comprise a gel composition that includes nicotine, at least one gelling agent and the aerosol former.
  • the gel composition is preferably substantially tobacco free.
  • the preferred weight ranges for nicotine in the gel composition are the same as those defined above in relation to aerosol-forming films.
  • the gel composition preferably comprises at least 50 percent by weight of aerosol former, more preferably at least 60 percent by weight, more preferably at least 70 percent by weight of aerosol former, on a dry weight basis.
  • the gel composition may comprise up to 80 percent by weight of aerosol former.
  • the aerosol former in the gel composition is preferably glycerol.
  • the gel composition preferably includes at least one gelling agent.
  • the gel composition includes a total amount of gelling agents in a range from about 0.4 percent by weight to about 10 percent by weight, or from about 0.5 percent by weight to about 8 percent by weight, or from about 1 percent by weight to about 6 percent by weight, or from about 2 percent by weight to about 4 percent by weight, or from about 2 percent by weight to about 3 percent by weight.
  • gelling agent refers to a compound that homogeneously, when added to a 50 percent by weight water/50 percent by weight glycerol mixture, in an amount of about 0.3 percent by weight, forms a solid medium or support matrix leading to a gel.
  • Gelling agents include, but are not limited to, hydrogen-bond crosslinking gelling agents, and ionic crosslinking gelling agents.
  • hydrophilicity crosslinking gelling agent refers to a gelling agent that forms non-covalent crosslinking bonds or physical crosslinking bonds via hydrogen bonding.
  • the hydrogen-bond crosslinking gelling agent may include one or more of a galactomannan, gelatin, agarose, or konjac gum, or agar.
  • the hydrogen-bond crosslinking gelling agent may preferably include agar.
  • ionic crosslinking gelling agent refers to a gelling agent that forms non- covalent crosslinking bonds or physical crosslinking bonds via ionic bonding.
  • the ionic crosslinking gelling agent may include low acyl gellan, pectin, kappa carrageenan, iota carrageenan or alginate.
  • the ionic crosslinking gelling agent may preferably include low acyl gellan.
  • the gelling agent may include one or more biopolymers.
  • the biopolymers may be formed of polysaccharides.
  • Biopolymers include, for example, gellan gums (native, low acyl gellan gum, high acyl gellan gums with low acyl gellan gum being preferred), xanthan gum, alginates (alginic acid), agar, guar gum, and the like.
  • the composition may preferably include xanthan gum.
  • the composition may include two biopolymers.
  • the composition may include three biopolymers.
  • the composition may include the two biopolymers in substantially equal weights.
  • the composition may include the three biopolymers in substantially equal weights.
  • the gel composition may further include a viscosifying agent.
  • the viscosifying agent combined with the hydrogen-bond crosslinking gelling agent and the ionic crosslinking gelling agent appears to surprisingly support the solid medium and maintain the gel composition even when the gel composition comprises a high level of glycerol.
  • the term “viscosifying agent” refers to a compound that, when added homogeneously into a 25°C, 50 percent by weight water/50 percent by weight glycerol mixture, in an amount of 0.3 percent by weight, increases the viscosity without leading to the formation of a gel, the mixture staying or remaining fluid.
  • the gel composition preferably includes the viscosifying agent in a range from about 0.2 percent by weight to about 5 percent by weight, or from about 0.5 percent by weight to about 3 percent by weight, or from about 0.5 percent by weight to about 2 percent by weight, or from about 1 percent by weight to about 2 percent by weight.
  • the viscosifying agent may include one or more of xanthan gum, carboxymethylcellulose, microcrystalline cellulose, methyl cellulose, gum Arabic, guar gum, lambda carrageenan, or starch.
  • the viscosifying agent may preferably include xanthan gum.
  • the gel composition may further include a divalent cation.
  • the divalent cation includes calcium ions, such as calcium lactate in solution.
  • Divalent cations (such as calcium ions) may assist in the gel formation of compositions that include gelling agents such as the ionic crosslinking gelling agent, for example. The ion effect may assist in the gel formation.
  • the divalent cation may be present in the gel composition in a range from about 0.1 to about 1 percent by weight, or about 0.5 percent by weight.
  • the gel composition may further include an acid.
  • the acid may comprise a carboxylic acid.
  • the carboxylic acid may include a ketone group.
  • the carboxylic acid may include a ketone group having less than about 10 carbon atoms, or less than about 6 carbon atoms or less than about 4 carbon atoms, such as levulinic acid or lactic acid.
  • this carboxylic acid has three carbon atoms (such as lactic acid).
  • the gel composition preferably comprises some water.
  • the gel composition is more stable when the composition comprises some water.
  • the gel composition comprises between about 8 percent by weight to about 32 percent by weight water, or from about 15 percent by weight to about 25 percent by weight water, or from about 18 percent by weight to about 22 percent by weight water, or about 20 percent by weight water.
  • the aerosol-forming substrate comprises a porous medium loaded with the gel composition.
  • a porous medium loaded with the gel composition is that the gel composition is retained within the porous medium, and this may aid manufacturing, storage or transport of the gel composition. It may assist in keeping the desired shape of the gel composition, especially during manufacture, transport, or use.
  • porous is used herein to refer to a material that provides a plurality of pores or openings that allow the passage of air through the material.
  • the porous medium may be any suitable porous material able to hold or retain the gel composition. Ideally the porous medium can allow the gel composition to move within it.
  • the porous medium comprises natural materials, synthetic, or semisynthetic, or a combination thereof.
  • the porous medium comprises sheet material, foam, or fibres, for example loose fibres; or a combination thereof.
  • the porous medium comprises a woven, non-woven, or extruded material, or combinations thereof.
  • the porous medium comprises, cotton, paper, viscose, PLA, or cellulose acetate, of combinations thereof.
  • the porous medium comprises a sheet material, for example, cotton or cellulose acetate.
  • the porous medium comprises a sheet made from cotton fibres.
  • the porous medium may be crimped or shredded.
  • the porous medium may be in the form of a sheet, thread or tubular element.
  • the aerosol-forming substrate may have added a portion of plant material, for example tobacco material, as long as the aerosol former content does not fall below 35 percent by weight.
  • the aerosol-forming substrate may comprise tobacco particles.
  • tobacco particles describes particles of any plant member of the genus Nicotiana.
  • tobacco particles encompasses ground or powdered tobacco leaf lamina, ground or powdered tobacco leaf stems, tobacco dust, tobacco fines, and other particulate tobacco by-products formed during the treating, handling and shipping of tobacco.
  • the tobacco particles are substantially all derived from tobacco leaf lamina.
  • isolated nicotine and nicotine salts are compounds derived from tobacco but are not considered tobacco particles for purposes of the invention and are not included in the percentage of particulate plant material.
  • the aerosol-forming substrate may comprise plant material and an aerosol former.
  • the plant material may be a plant material comprising an alkaloid, more preferably a plant material comprising nicotine, and more preferably a tobacco-containing material.
  • Alkaloids are a class of naturally occurring nitrogen-containing organic compounds. Alkaloids are found mostly in plants, but are also found in bacteria, fungi and animals. Examples of alkaloids include, but are not limited to, caffeine, nicotine, theobromine, atropine and tubocurarine. A preferred alkaloid is nicotine, which may be found in tobacco.
  • tobacco material is used to describe any material comprising tobacco, including, but not limited to, tobacco leaf, tobacco rib, tobacco stem, tobacco stalk, tobacco dust, expanded tobacco, reconstituted tobacco material and homogenised tobacco material.
  • flavorant refers to a composition having organoleptic properties, which provide a sensory experience to the user, for example to enhance the flavour of aerosol.
  • a flavourant can be used to deliver a gustatory sensation (taste), an olfactory sensation (smell), or both a gustatory and an olfactory sensation to the user, for example when inhaling the aerosol.
  • the substrate wrapper may have a density of 800 kilograms per cubic meter or less.
  • the density of the substrate wrapper may be 750 kilograms per cubic meter or less, preferably 700 kilograms per cubic meter or less, more preferably 650 kilograms per cubic meter or less, more preferably 600 kilograms per cubic meter or less, more preferably 550 kilograms per cubic meter or less, more preferably 500 kilograms per cubic meter or less, more preferably 450 kilograms per cubic meter or less.
  • the density of the substrate wrapper may be 400 kilograms per cubic meter or less, preferably 350 kilograms per cubic meter or less, more preferably about 320 kilograms per cubic meter.
  • the density of the substrate wrapper may be 400 kilograms per cubic meter or less and the substrate wrapper may have a thickness of 60 micrometers or more, preferably 70 micrometers or more, more preferably 75 micrometers or more, more preferably
  • micrometers or more 80 micrometers or more, more preferably 90 micrometers or more, more preferably 100 micrometers or more, more preferably 110 micrometers or more, more preferably
  • the substrate wrapper may have a thickness of about
  • the density of the substrate wrapper may be 400 kilograms per cubic meter or less and the substrate wrapper may have a thickness of between 143 micrometers and 153 micrometers.
  • the density of the substrate wrapper may be 400 kilograms per cubic meter or less and the substrate wrapper may have a thickness of between 140 micrometers and 160 micrometers.
  • the basis weight of the substrate wrapper may be less than 60 grams per square meter.
  • the basis weight of the substrate wrapper may be more than 28 grams per square meter and less than 60 grams per square meter.
  • the basis weight of the substrate wrapper may be more than 45 grams per square meter and less than 60 grams per square meter.
  • the basis weight of the substrate wrapper may be less than 50 grams per square meter.
  • the basis weight of the substrate wrapper may be more than 28 grams per square meter and less than 50 grams per square meter.
  • the basis weight of the substrate wrapper may be more than 45 grams per square meter and less than 50 grams per square meter.
  • the basis weight of the substrate wrapper may be about 48 grams per square meter.
  • the substrate wrapper may have a thickness of more than 145 micrometers and a density of 400 kilograms per cubic meter or less.
  • the substrate wrapper may comprise one or more perforations or may not comprise any perforations.
  • the substrate wrapper may exhibit a permeability of the wrapper of more than 10 CORESTA units, more than 20 CORESTA units, more than 50 CORESTA units, more than 100 CORESTA units, more than 500 CORESTA units, more than 1000 CORESTA units, more than 1500 CORESTA units, more than 2000 CORESTA units, more than 2500 CORESTA units, more than 3000 CORESTA units, more than 3500 CORESTA units, or more than 4000 CORESTA units.
  • the substrate wrapper may exhibit a permeability of the wrapper of between 10 CORESTA units and 10,000 CORESTA units, preferably between 50 CORESTA units and 8000 CORESTA units, more preferably between 100 CORESTA units and 5000 CORESTA units.
  • the substrate wrapper may exhibit a permeability of the wrapper of between 4000 CORESTA units and 4800 CORESTA units, preferably between 4200 CORESTA units and 4600 CORESTA units, more preferably between 4300 CORESTA units and 4500 CORESTA units.
  • the substrate wrapper may have a thickness of more than 145 micrometers, a density of 400 kilograms per cubic meter or less, and a permeability of the wrapper of between 50 CORESTA units and 5000 CORESTA units, preferably between 4200 CORESTA units and 4600 CORESTA units, more preferably between 4300 CORESTA units and 4500 CORESTA units.
  • the permeability of the substrate wrapper may be determined by utilizing the International Standard test method ISO 2965:2009 and the result may be presented as cubic centimeters per minute per square centimeters and referred to as “CORESTA units”.
  • the aerosol generating-article may comprise an additional wrapper circumscribing the substrate wrapper.
  • the additional wrapper may exhibit a permeability of the wrapper of less than 100 CORESTA units, less than 80 CORESTA units, less than 50 CORESTA units, less than 40 CORESTA units, or less than 30 CORESTA units.
  • the permeability of the additional wrapper may be less than the permeability of the substrate wrapper.
  • the permeability of the additional wrapper may be less than 1%, less than 2%, less than 5%, less than 10%, or less than 20% of the permeability of the substrate wrapper.
  • the permeability of the additional wrapper may be less than 50 CORESTA units and the permeability of the substrate wrapper may be between 4000 CORESTA units and 4800 CORESTA units, preferably between 4200 CORESTA units and 4600 CORESTA units, more preferably between 4300 CORESTA units and 4500 CORESTA units.
  • the additional wrapper may be a tipping wrapper as described herein.
  • the additional wrapper may be a combining wrapper.
  • the additional wrapper may advantageously reduce the overall permeability where a substrate wrapper with a high permeability is used.
  • the substrate wrapper may be embossed or may not be embossed.
  • the substrate wrapper may be both perforated and embossed.
  • embossment is used herein to refer to protrusions formed in the surface of a wrapper. These protrusions may be carved, moulded or stamped into the wrapper. The portion of wrapper carrying such embossments is said to be embossed.
  • the substrate wrapper may comprise an embossed portion.
  • the embossed portion of the substrate wrapper may have one embossment.
  • the embossed portion of the substrate wrapper may have a plurality of embossments.
  • the one or more embossments may have a depth of from 0.07 millimeter to 0.21 millimeter, preferably from 0.10 millimeter to 0.18 millimeter and more preferably from 0.12 millimeter to 0.16 millimeter.
  • Each embossment may also have a pitch of from 0.2 millimeter to 0.4 millimeter, preferably from 0.25 millimeter to 0.35 millimeter, more preferably from 0.275 millimeter to 0.325 millimeter.
  • the substrate wrapper may have a roughness of between about 50 Bekk seconds and about 1000 Bekk seconds, preferably between about 100 Bekk seconds and about 200 Bekk seconds.
  • the roughness expressed in Bekk seconds may be measured by means of a standard test using a BEKK Smoothness Tester, which creates a vacuum and measures the time it takes for the vacuum to drop from 50.66 kPa to 48.00 kPa. The test is recognized by the international standard ISO 5627.
  • the total density of the aerosol-forming substrate portion refers to the total mass of material received within the volume which is circumscribed by the substrate wrapper, divided by the volume which is circumscribed by the substrate wrapper.
  • the mass of the substrate wrapper itself and optional further wrappers circumscribing the substrate wrapper is not taken into account.
  • the volume of the substrate wrapper itself and optional further wrappers circumscribing the substrate wrapper is not taken into account.
  • the total density of the aerosol-forming substrate portion may be determined after conditioning the aerosol-generating article in accordance to ISO Standard 3402:1999.
  • the aerosol-forming substrate is removed from the aerosol-forming substrate portion and is weighed. If a susceptor is present, the susceptor is also removed from the aerosol-forming substrate portion and is also weighed.
  • the inner volume of the aerosol-forming substrate portion is determined. This may be done, for example, by laser measurement.
  • the inner volume of the aerosol-forming substrate portion generally corresponds to the cylindrical volume within the substrate wrapper.
  • the total density of the aerosol-forming substrate portion is calculated by dividing the sum of the mass of the aerosol-forming substrate and, if present, the mass of the susceptor by the inner volume of the substrate portion. This may be repeated 20 times for 20 different individual aerosol-generating articles to receive an average value.
  • the total density of the aerosol-generating article at the longitudinal position of the aerosol-forming substrate portion refers to the total mass of material received within the volume which is defined by the mean transversal cross-sectional area of the aerosol-generating article along the length of the aerosol-forming substrate portion, divided by the said volume.
  • the mass of each of the aerosol-forming substrate, an optional susceptor, the substrate wrapper, and each one or more optional further wrappers circumscribing the substrate wrapper is taken into account.
  • the volume of the substrate wrapper itself and each of the one or more optional further wrappers circumscribing the substrate wrapper is taken into account.
  • the total density of the aerosol-generating article at the longitudinal position of the aerosol-forming substrate portion’ may be determined after conditioning the aerosolgenerating article in accordance to ISO Standard 3402:1999.
  • the thickness of the substrate wrapper may be determined in accordance to ISO 534:2011.
  • the density of the substrate wrapper may be determined in accordance to ISO 534:2011.
  • the thickness of the substrate wrapper may be determined in accordance to ASTM £52-06(2021 )e1.
  • the local thickness at a position of an embossment may be less than the thickness at a position without an embossment.
  • the thickness of the substrate wrapper refers to the thickness at positions without embossments.
  • the thickness of the substrate wrapper may be determined before the wrapper is being embossed.
  • the density of the substrate wrapper may be calculated by dividing the basis weight of the substrate wrapper by the thickness of the substrate wrapper.
  • the basis weight also called grammage, refers to the mass of the substrate wrapper per sheet size, usually expressed in grams per square meter.
  • the basis weight may be obtained, for example, by weighing a 1 square meter sized sheet of the substrate wrapper.
  • the term “lightweight” means that the density of the substrate wrapper is 800 kilograms per cubic meter or less, preferably 750 kilograms per cubic meter or less, more preferably 700 kilograms per cubic meter or less, more preferably 650 kilograms per cubic meter or less, more preferably 600 kilograms per cubic meter or less, more preferably 550 kilograms per cubic meter or less, more preferably 500 kilograms per cubic meter or less, more preferably 450 kilograms per cubic meter or less, more preferably 400 kilograms per cubic meter or less, more preferably 350 kilograms per cubic meter or less, more preferably is about 320 kilograms per cubic meter.
  • the term “thick” means that a thickness of the substrate wrapper is 50 micrometers or more, preferably 60 micrometers or more, more preferably 70 micrometers or more, more preferably 75 micrometers or more, more preferably 80 micrometers or more, more preferably 90 micrometers or more, more preferably 100 micrometers or more, more preferably 110 micrometers or more, more preferably 120 micrometers or more, more preferably 130 micrometers or more, more preferably 140 micrometers or more, more preferably 145 micrometers or more, more preferably 150 micrometers or rr
  • the substrate wrapper may extend along the entire length of the aerosol-forming substrate portion in a direction along the longitudinal axis of the aerosol-generating article.
  • the substrate wrapper may extend along at least 40 percent, preferably at least 50 percent, more preferably at least 60 percent, more preferably at least 70 percent, more preferably at least 80 percent, more preferably at least 90 percent, more preferably at least 95 percent of the length of the aerosol-forming substrate portion in a direction along the longitudinal axis of the aerosol-generating article.
  • the substrate wrapper may be in direct physical contact with the aerosol-forming substrate. In that case, there is no layer of material between the substrate wrapper and the aerosol-forming substrate.
  • the substrate wrapper may be formed from a single continuous sheet of material.
  • the single continuous sheet may be wrapped around the aerosol-forming substrate portion by about one turn.
  • the single continuous sheet may be wrapped around the substrate portion by slightly more than one turn in order to form an overlapping region of opposing end portions of the substrate wrapper.
  • the thickness of the wrapper is not to be measured in the overlapping region.
  • the substrate wrapper formed from a single continuous sheet of material may thus comprise only a single layer, except for an optional overlapping region, if present.
  • the substrate wrapper may be formed from a single continuous sheet which is wrapped around the aerosol-forming substrate portion by at least about two or more turns. In that case, two or more layers of substrate wrapper are wrapped around the aerosol-forming substrate portion - not taking into account an additional overlapping region formed by the overlapping opposing end portions of the wrapper. In that case, the thickness of the substrate wrapper may be obtained by multiplying the thickness of an individual layer, i.e. the sheet thickness, by the number of turns. The thickness of the substrate wrapper is not to be obtained by multiplying the thickness of an individual layer by the number of turns in the overlapping region formed by overlapping opposing end portions of the wrapper. None of the individual layers extends beyond ends of the aerosol-forming substrate portion in a longitudinal direction of the aerosol-generating article.
  • the substrate wrapper may comprise one or more of cardboard, plastics, and metal foil.
  • the substrate wrapper may comprise a cellulosic material, for example one or more of paper, wood, textile, natural fibers, and artificial fibers.
  • the substrate wrapper may comprise a paper layer.
  • the substrate wrapper may be made of a single paper sheet.
  • the substrate wrapper may comprise a single paper layer wrapped around the aerosol-forming substrate portion, except for an option overlapping portion.
  • the substrate wrapper may be made of a single paper sheet wrapped around the aerosol-forming substrate portion two or more times, resulting in a substrate wrapper comprising two or more layers having the same length.
  • the substrate wrapper may be a paper wrapper or a non-paper wrapper.
  • Suitable non-paper wrappers include, but are not limited to sheets of homogenised tobacco materials.
  • the substrate wrapper may comprise a laminate sheet.
  • the substrate wrapper may be made of a single laminate sheet.
  • the laminate sheet may be a laminate of a paper layer with an aluminum layer.
  • the wrapper may be formed of a laminate material comprising a plurality of layers.
  • the wrapper may be formed of a metallic co-laminated sheet, for example an aluminium colaminated sheet.
  • the metallic layer of the co-laminated sheet may have a grammage from 12 grams per square meter to 25 grams per square meter, preferably from 15 grams per square meter to 20 grams per square meter.
  • the metallic layer of the co-laminated sheet may have a thickness from 2 micrometers to 15 micrometers, preferably from 3 micrometers to 12 micrometers, more preferably from 5 micrometers to 10 micrometers.
  • the substrate wrapper may be a paper wrapper comprising PVOH (polyvinyl alcohol) or silicone (or polysiloxane) (or polysiloxane). Addition of PVOH (polyvinyl alcohol) or silicone (or polysiloxane) may improve the grease barrier properties of the wrapper.
  • the substrate wrapper may comprise a flame retardant composition comprising one or more flame retardant compounds.
  • flame retardant compounds is used herein to describe chemical compounds that, when added to or otherwise incorporated into a carrier substrate, such as paper or plastic compounds, provide the carrier substrate with varying degrees of flammability protection.
  • 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 substrate wrapper may be a substrate wrapper system formed from two or more individual substrate wrapper sub-sheets.
  • the thickness of the substrate wrapper may be obtained by adding the thicknesses of the individual substrate wrapper sub-sheets of the substrate wrapper system. It may be that none of the individual substrate wrapper subsheets extends beyond ends of the aerosol-forming substrate portion in a longitudinal direction of the aerosol-generating article.
  • Each of the individual substrate wrapper subsheets forming the substrate wrapper system may be of the same length in a direction parallel to the longitudinal axis of the aerosol-generating article.
  • the substrate wrapper may be a substrate wrapper system formed from two or more individual substrate wrapper sub-sheets, wherein each of the two or more individual substrate wrapper sub-sheets at least partly circumscribes the aerosol-forming substrate portion, wherein none of the two or more individual substrate wrapper sub-sheets extends beyond ends of the aerosol-forming substrate portion in a longitudinal direction of the aerosol-generating article, wherein each of the two or more individual substrate wrapper subsheets has a thickness of 50 micrometers or more and a density of 800 kilograms per cubic meter or less, and, preferably, wherein each of the individual substrate wrapper sub-sheets forming the substrate wrapper system is of the same length in a direction parallel to the longitudinal axis of the aerosol-generating article.
  • the substrate wrapper may be a substrate wrapper system formed from two or more individual substrate wrapper sub-sheets, wherein each of the two or more individual substrate wrapper sub-sheets at least partly circumscribes the aerosol-forming substrate portion, wherein each of the two or more individual substrate wrapper sub-sheets has the same length in a longitudinal direction of the aerosol-generating article, wherein each of the two or more individual substrate wrapper sub-sheets has a thickness of 50 micrometers or more and a density of 800 kilograms per cubic meter or less.
  • the substrate wrapper may be a substrate wrapper system formed from two or more individual substrate wrapper sub-sheets, wherein each of the two or more individual substrate wrapper sub-sheets at least partly circumscribes the aerosol-forming substrate portion, wherein none of the two or more individual substrate wrapper sub-sheets extends beyond ends of the aerosol-forming substrate portion in a longitudinal direction of the aerosol-generating article, wherein the sum of the two or more individual substrate wrapper sub-sheets has a thickness of 50 micrometers or more and a density of 800 kilograms per cubic meter or less, and, preferably, wherein each of the individual substrate wrapper sub- sheets forming the substrate wrapper system is of the same length in a direction parallel to the longitudinal axis of the aerosol-generating article.
  • the substrate wrapper may be a substrate wrapper system formed from two or more individual substrate wrapper sub-sheets, wherein each of the two or more individual substrate wrapper sub-sheets at least partly circumscribes the aerosol-forming substrate portion, wherein each of the two or more individual substrate wrapper sub-sheets has the same length in a longitudinal direction of the aerosol-generating article, wherein the sum of the two or more individual substrate wrapper sub-sheets has a thickness of 50 micrometers or more and a density of 800 kilograms per cubic meter or less.
  • the substrate wrapper system may be formed from two individual sheets.
  • the substrate wrapper system may be formed from a first individual sheet and a second individual sheet.
  • the first individual sheet may be provided by a first wrapper comprising a first overlapping region formed by overlapping opposing end portions of the first wrapper.
  • the second individual sheet may be provided by a second wrapper comprising a second overlapping region formed by overlapping opposing end portions of the second wrapper.
  • the first overlapping region may be offset from the second overlapping region by at least about 5 percent of a circumference of the aerosol-forming substrate portion, preferably by at least about 10 percent of a circumference of the aerosol-forming substrate portion, more preferably by at least about 15 percent of a circumference of the aerosol-forming substrate portion, more preferably by about 40 percent to about 60 percent of a circumference of the aerosol-forming substrate portion.
  • One or both of the first and second individual sheets may be paper wrappers.
  • the aerosol-generating article may comprise a downstream section located downstream of the aerosol-forming substrate portion.
  • the downstream section is preferably located immediately downstream of the aerosol-forming substrate portion.
  • the downstream section of the aerosol-generating article preferably extends between the aerosol-forming substrate portion 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 10 millimeters, or at least 20 millimeters, or at least 25 millimeters, or at least 30 millimeters.
  • a length of the downstream section may be less than 70 millimeters, or less than 60 millimeters, or less than 50 millimeters.
  • a length of the downstream section may be between 20 millimeters and 70 millimeters, or between 25 millimeters and 60 millimeters, or between 30 millimeters and 50 millimeters.
  • the downstream section of an aerosol-generating article according to the present invention preferably comprises a hollow tubular cooling element provided downstream of the aerosol-forming substrate portion.
  • 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 aerosol-forming substrate portion. In other words, the hollow tubular cooling element may abut a downstream end of the aerosol-forming substrate portion.
  • 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.
  • 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 millimeters of water gauge per 10 millimeters of length of the hollow tubular cooling element, preferably less than 0.4 millimeters of water gauge per 10 millimeters of length of the hollow tubular cooling element, more preferably less than 0.1 millimeters of water gauge per 10 millimeters of length of the hollow tubular cooling element.
  • the RTD of a hollow tubular cooling element is preferably less than or equal to 10 millimeters of water gauge, or less than or equal to 5 millimeters of water gauge, or less than or equal to 2.5 millimeters of water gauge, or less than or equal to 2 millimeters of water gauge, or less than or equal to 1 millimeter of water gauge.
  • the RTD of a hollow tubular cooling element may be at least 0 millimeters of water gauge, or at least 0.25 millimeters of water gauge or at least 0.5 millimeters of water gauge or at least 1 millimeter of water gauge.
  • 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 aerosolgenerating 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.
  • the length of the hollow tubular cooling element may be at least 15 millimeters, or at least 20 millimeters, or at least 25 millimeters.
  • the length of the hollow tubular cooling element may be less than 50 millimeters, or less than 45 millimeters, or less than 40 millimeters.
  • the length of the hollow tubular cooling element may be between 15 millimeters and 50 millimeters, or between 20 millimeters and 45 millimeters, or between 20 millimeters and 40 millimeters, or between 20 millimeters and 30 millimeters, or between 25 millimeters and 40 millimeters.
  • a relatively long hollow tubular cooling element provides and defines a relatively long internal cavity within the aerosol-generating article and downstream of the aerosol-forming substrate portion.
  • Providing an empty cavity downstream (preferably, immediately downstream) of the aerosol-forming substrate enhances the nucleation of aerosol particles generated by the substrate.
  • Providing a relatively long cavity maximises such nucleation benefits, thereby improving aerosol formation and cooling.
  • the wall thickness of the hollow tubular cooling element may between 100 micrometers and 2 millimeters, or between 150 micrometers and 1.5 millimeters, or between 200 micrometers and 1.25 millimeters.
  • the hollow tubular cooling element preferably has an external diameter that is approximately equal to the external diameter of the aerosol-generating article.
  • the hollow tubular cooling element may have an external diameter of between 5 millimeters and 10 millimeters, for example of between 5.5 millimeters and 9 millimeters or of between 6 millimeters and 8 millimeters. In certain embodiments, the hollow tubular cooling element has an external diameter of less than 7 millimeters.
  • the hollow tubular cooling element may have an internal diameter.
  • the hollow tubular cooling element has a constant internal diameter along a length of the hollow tubular cooling element.
  • the internal diameter of the hollow tubular cooling element may vary along the length of the hollow tubular cooling element.
  • the hollow tubular cooling element may have an internal diameter of at least 2 millimeters.
  • the hollow tubular cooling element may have an internal diameter of at least 3 millimeters, at least 4 millimeters, or at least 5 millimeters.
  • 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 millimeters.
  • the hollow tubular cooling element may have an internal diameter of no more than 9 millimeters, no more than 8 millimeters, or no more than 7 millimeters.
  • 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 millimeters and 10 millimeters, between 3 millimeters and 9 millimeters, between 4 millimeters and 8 millimeters, or between 5 millimeters and 7 millimeters.
  • the lumen or cavity of the hollow tubular cooling element may have any cross sectional shape.
  • the lumen of the hollow tubular cooling element may have a circular cross sectional shape.
  • the hollow tubular cooling element may comprise a paper-based material.
  • the hollow tubular cooling element may comprise at least one layer of paper.
  • the paper may be very rigid paper.
  • the paper may be crimped paper, such as crimped heat resistant paper or crimped parchment paper.
  • the hollow tubular cooling element may comprise cardboard.
  • the hollow tubular cooling element may be a cardboard tube.
  • the hollow tubular cooling element may be formed from cardboard.
  • cardboard is a cost-effective material that provides a balance between being deformable in order to provide ease of insertion of the article into an aerosol-generating device and being sufficiently stiff to provide suitable engagement of the article with the interior of the device.
  • a cardboard tube may therefore provide suitable resistance to deformation or compression during use.
  • the hollow tubular cooling element may be a paper tube.
  • the hollow tubular cooling element may be a tube formed from spirally wound paper.
  • the hollow tubular cooling 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.
  • the hollow tubular cooling element may comprise a polymeric material.
  • the hollow tubular cooling element may comprise a polymeric film.
  • the polymeric film may comprise a cellulosic film.
  • the hollow tubular cooling element may comprise low density polyethylene (LDPE) or polyhydroxyalkanoate (PHA) fibres.
  • the hollow tube may comprise cellulose acetate tow.
  • 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 aerosol-generating article according to the present invention comprises a ventilation zone at a location along the downstream section.
  • the ventilation zone may be provided at a location along the hollow tubular cooling element.
  • the ventilation zone may be provided at a location along the downstream hollow tubular element.
  • a ventilated cavity is provided downstream of the aerosol-forming substrate portion.
  • This provides several potential technical benefits.
  • the inventors have found that one such ventilated hollow tubular cooling element provides a particularly efficient cooling of the aerosol.
  • the inventors have surprisingly found that such rapid cooling of the volatile species released upon heating the aerosol-forming substrate enhances nucleation of aerosol particles.
  • the ventilation zone may typically comprise a plurality of perforations through the peripheral wall of the hollow tubular cooling element.
  • the ventilation zone comprises at least one circumferential row of perforations.
  • the ventilation zone 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.
  • An aerosol-generating article in accordance with the present invention may have a ventilation level of at least 40 percent. Increasing the ventilation level may increase the level of aerosol cooling. However, increasing the ventilation level may mean that less air is admitted into the aerosol-generating article via the upstream end of the aerosol-generating article which then flows through the aerosol-forming substrate portion. The ventilation level may thereby be selected based on a desired temperature and composition of the aerosol delivered to a user.
  • the aerosol-generating article preferably has a ventilation level of at least 45 percent, more preferably at least 50 percent, more preferably at least 60 percent, more preferably at least 70 percent.
  • An aerosol-generating article in accordance with the present invention may have a ventilation level of less than or equal to 90 percent, more preferably less than or equal to 85 percent, more preferably less than or equal to 80 percent.
  • an aerosol-generating article in accordance with the present invention may have a ventilation level from 45 percent to 90 percent, more preferably from 45 percent to 85 percent, even more preferably from 45 percent to 80 percent.
  • the aerosol-generating article in accordance with the present invention may have a ventilation level from 50 percent to 90 percent, preferably from 50 percent to 85 percent, more preferably from 50 percent to 80 percent.
  • the aerosol-generating article in accordance with the present invention may have a ventilation level from 60 percent to 90 percent, preferably from 60 percent to 85 percent, more preferably from 60 percent to 80 percent.
  • the aerosol-generating article in accordance with the present invention may have a ventilation level from 70 percent to 90 percent, preferably from 70 percent to 85 percent, more preferably from 70 percent to 80 percent.
  • the aerosol-generating article may have a ventilation level of about 75 percent.
  • the downstream section may comprise a downstream filter segment.
  • the downstream filter segment may extend to a downstream end of the downstream section.
  • the downstream filter segment may be located at the downstream end of the aerosol-generating article.
  • the downstream end of the downstream filter segment may define the downstream end of the aerosol-generating article.
  • the downstream filter segment may also be referred to as mouth-end filter.
  • the downstream filter segment may be located downstream of a hollow tubular cooling element, which is described above.
  • the downstream filter segment may extend between the hollow tubular cooling element and the downstream end of the aerosolgenerating article.
  • the downstream filter segment is preferably a solid plug, which may also be described as a ‘plain’ plug and is non-tubular.
  • the filter segment therefore preferably has a substantially uniform transverse cross section.
  • the downstream filter segment is preferably formed of a fibrous filtration material.
  • the fibrous filtration material may be for filtering the aerosol that is generated from the aerosol-forming substrate. Suitable fibrous filtration materials would be known to the skilled person.
  • the at least one downstream filter segment comprises a cellulose acetate filter segment formed of cellulose acetate tow.
  • the downstream section includes a single downstream filter segment.
  • the downstream section includes two or more downstream filter segments axially aligned in an abutting end to end relationship with each other.
  • 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 is circumscribed by a plug wrap.
  • the downstream filter segment is unventilated such that air does not enter the aerosol-generating article along the downstream filter segment.
  • the downstream filter segment is preferably connected to one or more of the adjacent upstream components of the aerosol-generating article by means of a tipping wrapper.
  • the downstream filter segment preferably has an external diameter that is approximately equal to the external diameter of the aerosol-generating article.
  • the external diameter of a downstream filter segment may be substantially the same as the external diameter of the hollow tubular cooling element.
  • the external diameter of the downstream filter segment may be between 5 millimeters and 10 millimeters, or between 5.5 millimeters and 9 millimeters, or between 6 millimeters and 8 millimeters. In certain embodiments, the external of the downstream filter segment is less than 7 millimeters.
  • 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 normally carried out at a volumetric flow rate of 17.5 milliliters 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 may be expressed with the units of pressure “millimeter(s) of water gauge” (mmWG).
  • the resistance to draw (RTD) of the downstream section may be at least 0 millimeters of water gauge.
  • the RTD of the downstream section may be at least 3 millimeters of water gauge.
  • the RTD of the downstream section may be at least 6 millimeters of water gauge.
  • the RTD of the downstream section may be no greater than 12 millimeters of water gauge.
  • the RTD of the downstream section may be no greater than 11 millimeters of water gauge.
  • the RTD of the downstream section may be no greater than 10 millimeters of water gauge.
  • 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 millimeters of water gauge, or at least 3 millimeters of water gauge, or at least 6 millimeters of water gauge.
  • the RTD of the downstream filter segment may be no greater than 12 millimeters of water gauge, or no greater than 11 millimeters of water gauge, or no greater than 10 millimeters of water gauge.
  • 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 length of the downstream filter segment may be at least 5 millimeters, or at least 10 millimeters.
  • the length of the downstream filter segment may be less than 25 millimeters, or less than 20 millimeters.
  • the length of the downstream filter segment may be between 5 millimeters and 25 millimeters, or between 10 millimeters and 25 millimeters, or between 5 millimeters and 20 millimeters, or between 10 millimeters and 20 millimeters.
  • the downstream section may further comprise one or more additional hollow tubular elements.
  • 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 aerosol-forming substrate portion.
  • 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 preferably has an external diameter that is approximately equal to the external diameter of the aerosol-generating article.
  • the hollow tubular support element may have an external diameter of between 5 millimeters and 10 millimeters, for example of between 5.5 millimeters and 9 millimeters or of between 6 millimeters and 8 millimeters. In a preferred embodiment, the hollow tubular support element has an external diameter of less than 7 millimeters.
  • the hollow tubular support element may have a wall thickness of at least 1 millimeter, preferably at least 1.5 millimeters, more preferably at least 2 millimeters.
  • the hollow tubular support element may have a length of at least 5 millimeters. Preferably, the support element has a length of at least 6 millimeters, more preferably at least 7 millimeters. The hollow tubular support element may have a length of less than 15 millimeters. Preferably, the hollow tubular support element has a length of less than 12 millimeters, more preferably less than 10 millimeters.
  • the hollow tubular support element has a length from 5 millimeters to 15 millimeters, preferably from 6 millimeters to 15 millimeters, more preferably from 7 millimeters to 15 millimeters. In other embodiments, the hollow tubular support element has a length from 5 millimeters to 12 millimeters, preferably from 6 millimeters to 12 millimeters, more preferably from 7 millimeters to 12 millimeters. In further embodiments, the support element has a length from 5 millimeters to 10 millimeters, preferably from 6 millimeters to 10 millimeters, more preferably from 7 millimeters to 10 millimeters.
  • the downstream section may further comprise a downstream hollow tubular element downstream of the hollow tubular cooling element.
  • the downstream hollow tubular element may be provided immediately adjacent to the hollow tubular cooling element.
  • the downstream hollow tubular element is separated from the hollow tubular cooling element by at least one other component.
  • the downstream section may comprise a downstream filter segment between the hollow tubular cooling element and the downstream hollow tubular element.
  • 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.
  • the downstream hollow tubular element may define a mouth end cavity 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 less than or equal to 10 millimeters of water gauge, or less than or equal to 5 millimeters of water gauge, or less than or equal to 2.5 millimeters of water gauge, or less than or equal to 2 millimeters of water gauge.
  • the RTD of the downstream hollow tubular element is less than or equal to 1 millimeter of water gauge.
  • the RTD of the downstream hollow tubular element may be at least 0 millimeters of water gauge, or at least 0.25 millimeters of water gauge or at least 0.5 millimeters of water gauge or at least 1 millimeter of water gauge.
  • the flow channel of the downstream hollow tubular element 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 length of the downstream hollow tubular element is at least 3 millimeters, more preferably at least 4 millimeters, more preferably at least 5 millimeters, more preferably at least 6 millimeters.
  • the length of the downstream hollow tubular element is preferably less than 20 millimeters, more preferably less than 15 millimeters, more preferably less than 12 millimeters and more preferably less than 10 millimeters.
  • the lumen or cavity of the downstream hollow tubular element may have any cross sectional shape.
  • the lumen of the downstream hollow tubular element may have a circular cross sectional shape.
  • the downstream hollow tubular element may comprise a paper-based material.
  • the downstream hollow tubular element may comprise at least one layer of paper.
  • the paper may be very rigid paper.
  • the paper may be crimped paper, such as crimped heat resistant paper or crimped parchment paper.
  • the downstream hollow tubular element may comprise cardboard.
  • the downstream hollow tubular element may be a cardboard tube.
  • 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.
  • the downstream hollow tubular element may comprise a polymeric material.
  • the downstream hollow tubular element may comprise a polymeric film.
  • the polymeric film may comprise a cellulosic film.
  • the downstream hollow tubular element may comprise low density polyethylene (LDPE) or polyhydroxyalkanoate (PHA) fibres.
  • LDPE low density polyethylene
  • PHA polyhydroxyalkanoate
  • the downstream hollow tubular element comprises cellulose acetate tow.
  • the downstream hollow tubular element comprises a hollow acetate tube.
  • the downstream hollow tubular 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 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. In one example, 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. In another example, 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 ventilation zone at a location along the downstream hollow tubular element may comprise a plurality of perforations through the peripheral wall of the downstream hollow tubular element.
  • the ventilation zone at a location along the downstream hollow tubular element comprises at least one circumferential row of perforations.
  • the ventilation zone may comprise two circumferential rows of perforations.
  • the perforations may be formed online during manufacturing of the aerosolgenerating article.
  • each circumferential row of perforations comprises from 8 to 30 perforations.
  • the aerosol-generating article may comprise one or more hollow tubular elements.
  • the one or more hollow tubular elements may form part of a downstream section of the aerosol-generating article arranged downstream of the aerosol-forming substrate portion.
  • the one or more hollow tubular elements may comprise one or both of a hollow acetate tube (HAT) and a fine hollow acetate tube (FHAT).
  • HAT hollow acetate tube
  • FHAT fine hollow acetate tube
  • Such hollow tubes are cylindrical components which may be made from cellulose acetate and which are provided with centrally arranged axial holes.
  • the dimensions of the hollow tubes such as their outer diameter or the diameter of the hole vary and can be designed according to the demands of the respective products.
  • the HAT may have a length of between 6 millimeters and 10 millimeters, preferably between 7 millimeters and 9 millimeters, more preferably about 8 millimeters.
  • the HAT may be arranged downstream of the aerosol-forming substrate portion, preferably downstream of and directly abutting the aerosol-forming substrate portion.
  • the HAT may serve as on ore more of an airflow-cooling element and an airflow-accelerating element.
  • the FHAT may be arranged downstream of the HAT, preferably downstream of and directly abutting the HAT.
  • the inner diameter of the FHAT may be larger than the inner diameter of the HAT.
  • the inner diameter of the FHAT may be about twice the size of the inner diameter of the HAT.
  • the FHAT may serve as an airflow-decelerating element.
  • the aerosol-generating article may comprise a mouth-end filter.
  • the mouth-end filter may be arranged downstream of the aerosol-forming substrate portion.
  • the mouth-end filter may be arranged at a proximal end of the aerosol-generating article.
  • the mouth-end filter may be arranged downstream of and directly abutting the FHAT.
  • the mouth-end filter may comprise a filter material.
  • the filter material may be a filamentary material, for example cellulose acetate.
  • the dernier per filament may be 12.
  • the dernier of the filter material may be 12Y28.
  • the length of the mouth-end filter along a longitudinal direction of the aerosolgenerating article may be between 10 millimeters and 14 millimeters, preferably between 11 millimeters and 13 millimeters, more preferably about 12 millimeters.
  • the resistance to draw of the mouth-end filter may be between 1 millimeter of water gauge and 100 millimeters of water gauge, preferably between 2 millimeters of water gauge and 50 millimeters of water gauge, more preferably between 5 millimeters of water gauge and 40 millimeters of water gauge, more preferably between 10 millimeters of water gauge and 30 millimeters of water gauge, more preferably between 16 millimeters of water gauge and 20 millimeters of water gauge, more preferably between 17 millimeters of water gauge and 19 millimeters of water gauge, more preferably is about 18 millimeters of water gauge.
  • the resistance to draw of the mouth-end filter be per millimeter length along a longitudinal direction of the aerosol-generating article may be between 0.1 millimeter of water gauge and 20 millimeters of water gauge, preferably between 0.2 millimeter of water gauge and 10 millimeters of water gauge, more between 0.5 millimeter of water gauge and 5 millimeters of water gauge, more between 1 millimeter of water gauge and 2 millimeters of water gauge, more preferably between 1.3 millimeters of water gauge and 1.7 millimeters of water gauge, more preferably between 1.4 millimeter of water gauge and 1.6 millimeters of water gauge, more preferably about 1.5 millimeters of water gauge.
  • Aerosol-generating articles comprise an upstream section located upstream of the aerosol-forming substrate portion.
  • the upstream section is preferably located immediately upstream of the aerosol-forming substrate portion.
  • the upstream section preferably extends between the upstream end of the aerosol-generating article and the aerosol-forming substrate portion.
  • the upstream section comprises one or more upstream elements located upstream of the aerosol-forming substrate portion.
  • the aerosol-generating articles of the present invention preferably comprise an upstream element located upstream of and adjacent to the aerosol-forming substrate portion.
  • the upstream element advantageously prevents direct physical contact with the upstream end of the aerosol-forming substrate portion
  • the presence of an upstream element helps to prevent any loss of the substrate, which may be advantageous, for example, if the substrate contains particulate plant material.
  • the upstream segment of the aerosol-forming substrate portion comprises shredded tobacco, such as tobacco cut filler
  • the upstream section or element thereof may additionally help to prevent the loss of loose particles of tobacco from the upstream end of the article. This may be particularly important when the shredded tobacco has a relatively low density, for example.
  • 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 aerosolgenerating 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.
  • An upstream element may be made of a porous material or may comprise a plurality of openings. This may, for example, be achieved through laser perforation. Preferably, the plurality of openings is distributed homogeneously over the cross-section 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
  • An upstream element may be formed from a material that is impermeable to air.
  • the aerosol-generating article may be configured such that air flows into the aerosol-forming substrate portion through suitable ventilation means provided in a wrapper.
  • this may be the case for articles that are intended to be inserted the cavity of an aerosol-generating device such that the aerosolforming substrate is externally heated, as described herein.
  • the RTD of an upstream element may be less than 30 millimeters of water gauge, or less than 20 millimeters of water gauge, or less than 10 millimeters of water gauge, or less than 5 millimeters of water gauge, or less than 2 millimeters of water gauge.
  • the RTD of an upstream element may be at least 0.1 millimeters of water gauge, or at least 0.25 millimeters of water gauge or at least 0.5 millimeters of water gauge.
  • an upstream element has an RTD of less than 2 millimeters of water gauge per millimeter of length, more preferably less than 1.5 millimeters of water gauge per millimeter of length, more preferably less than 1 millimeter of water gauge per millimeter of length, more preferably less than 0.5 millimeters of water gauge per millimeter of length, more preferably less than 0.3 millimeters of water gauge per millimeter of length, more preferably less than 0.2 millimeters of water gauge per millimeter of length.
  • the combined RTD of the upstream section, or upstream element thereof, and the aerosol-forming substrate portion is less than 15 millimeters of water gauge, more preferably less than 12 millimeters of water gauge, more preferably less than 10 millimeters of water gauge.
  • an upstream element is formed of a solid cylindrical plug element having a filled cross-section.
  • a plug element may be referred to as a ‘plain’ element.
  • the solid plug element may be porous, as described above, but does not have a tubular form and therefore does not provide a longitudinal flow channel.
  • the solid plug element preferably has a substantially uniform transverse cross section.
  • an upstream element is formed of a hollow tubular segment defining a longitudinal cavity providing an unrestricted flow channel.
  • an upstream element can provide protection for the aerosol-forming substrate, as described above, whilst having a minimal effect on the overall resistance to draw (RTD) and filtration properties of the article.
  • the diameter of the longitudinal cavity of the hollow tubular segment forming an upstream element is at least 3 millimeters, more preferably at least 3.5 millimeters, more preferably at least 4 millimeters and more preferably at least 4.5 millimeters.
  • 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 millimeters, more preferably less than 1.5 millimeters and more preferably less than 1 millimeter.
  • 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-forming substrate.
  • the upstream element may comprise a plug of cellulose acetate.
  • the upstream element may comprise a hollow acetate tube, or a cardboard tube.
  • an upstream element is formed of a heat resistant material.
  • an upstream element is formed of a material that resists temperatures of up to 350 degrees Celsius. This ensures that an upstream element is not adversely affected by the heating means for heating the aerosol-forming substrate.
  • the upstream section, or an upstream element thereof has an external diameter that is approximately equal to the external diameter of the aerosol-generating article.
  • the external diameter of the upstream section, or an upstream element thereof is between 5 millimeters and 8 millimeters, more preferably between 5.25 millimeters and 7.5 millimeters, more preferably between 5.5 millimeters and 7 millimeters.
  • the upstream section or an upstream element has a length of between 2 millimeters and 10 millimeters, more preferably between 3 millimeters and 8 millimeters, more preferably between 2 millimeters and 6 millimeters. In a particularly preferred embodiment, the upstream section or an upstream element has a length of 5 millimeters.
  • the upstream section is preferably circumscribed by a wrapper, such as a plug wrap.
  • the wrapper circumscribing the upstream section is preferably a stiff plug wrap, for example, a plug wrap having a basis weight of at least 80 grams per square meter, or at least 100 grams per square meter, or at least 110 grams per square meter. This provides structural rigidity to the upstream section.
  • the upstream section is preferably connected to the aerosol-forming substrate portion and optionally at least a part of the downstream section by means of an outer wrapper.
  • the aerosol-generating article may comprise an upstream section comprising a front plug.
  • the front plug may be arranged upstream of and directly abutting the aerosol-forming substrate portion.
  • the front plug may be arranged at a distal end of the aerosol-generating article.
  • the front plug may comprise a filter material.
  • the length of the front plug along a longitudinal direction of the aerosol-generating article may be between 1 millimeters and 10 millimeters, preferably between 3 millimeters and 7 millimeters, more preferably between 4 millimeters and 6 millimeters, more preferably about 5 millimeters.
  • the front plug may be in the form of a full cylinder.
  • a ratio of substrate wrapper thickness to front plug diameter may be in the range from 0.007 to 0.03, preferably 0.015 to 0.027, more preferably 0.022 to 0.024.
  • An outer diameter of the front plug may differ from an outer diameter of the substrate wrapper circumscribing the aerosol-forming substrate portion by less than 5 percent, preferably by less than 3 percent, more preferably by less than 1 percent, optionally, wherein the outer diameter of the front plug is 7.1 millimeters.
  • the front plug may be circumscribed by a front plug wrapper.
  • a ratio of the thickness of the front plug wrapper to the thickness of the substrate wrapper may be 0.7 or less, more preferably 0.5 or less, more preferably 0.3 or less, more preferably 0.2 or less. It may be that no portion of the front plug is circumscribed by the substrate wrapper.
  • the resistance to draw of the front plug may be between 1 millimeter of water gauge and 150 millimeters of water gauge, preferably between 1 millimeter of water gauge and
  • the resistance to draw of the front plug may be about
  • the front plug may assist in maintaining cleanliness of the aerosol-generating device by trapping slurry in the consumable.
  • the front plug may hinder aerosol-forming substrate or a heating element from falling out of the aerosol-generating article.
  • the aerosol-generating article in accordance with the invention may have an overall length of at least 40 millimeters, or at least 50 millimeters, or at least 60 millimeters.
  • An overall length of an aerosol-generating article in accordance with the invention may be less than or equal to 90 millimeters, or less than or equal to 85 millimeters, or less than or equal to 80 millimeters.
  • an overall length of the aerosol-generating article is preferably from 50 millimeters to 90 millimeters, more preferably from 60 millimeters to 90 millimeters, even more preferably from 70 millimeters to 90 millimeters. In other embodiments, an overall length of the aerosol-generating article is preferably from 50 millimeters to 85 millimeters, more preferably from 60 millimeters to 85 millimeters, even more preferably from 70 millimeters to 85 millimeters. In further embodiments, an overall length of the aerosolgenerating article is preferably from 50 millimeters to 80 millimeters, more preferably from 60 millimeters to 80 millimeters, even more preferably from 70 millimeters to 80 millimeters. In an exemplary embodiment, an overall length of the aerosol-generating article is 75 millimeters.
  • an overall length of the aerosol-generating article is preferably from 40 millimeters to 70 millimeters, more preferably from 45 millimeters to 70 millimeters. In other embodiments, an overall length of the aerosol-generating article is preferably from 40 millimeters to 60 millimeters, more preferably from about 45 millimeters to about 60 millimeters. In further embodiments, an overall length of the aerosol-generating article is preferably from 40 millimeters to 50 millimeters, more preferably from 45 millimeters to 50 millimeters. In an exemplary embodiment, an overall length of the aerosol-generating article is about 45 millimeters.
  • the aerosol-generating article has an external diameter of at least about 5 millimeters. More preferably, the aerosol-generating article has an external diameter of at least 5.25 millimeters. Even more preferably, the aerosol-generating article has an external diameter of at least 5.5 millimeters.
  • the aerosol-generating article preferably has an external diameter of less than or equal to 8 millimeters. More preferably, the aerosol-generating article has an external diameter of less than or equal to 7.5 millimeters. Even more preferably, the aerosolgenerating article has an external diameter of less than or equal to 7 millimeters.
  • the aerosol-generating article may have an external diameter of between 5 millimeters and 8 millimeters, or between 5 millimeters and 7.5 millimeters, or between 5 millimeters and 7 millimeters, or between 5.25 millimeters and 8 millimeters, or between 5.25 millimeters and 7.5 millimeters, or between 5.25 millimeters and 7 millimeters, or between 5.5 millimeters and 8 millimeters, or between 5.5 millimeters and 7.5 millimeters, or between 5.5 millimeters and 7 millimeters.
  • the external diameter of the aerosol-generating article may be substantially constant over the whole length of the article.
  • different portions of the aerosolgenerating article may have different external diameters.
  • the overall RTD of the aerosol-generating article is at least 10 millimeters of water gauge.
  • the overall RTD of the aerosol-generating article may be at least 20 millimeters of water gauge, at least 30 millimeters of water gauge, at least 35 millimeters of water gauge, or at least 40 millimeters of water gauge.
  • the overall RTD of the aerosol-generating article may be no more than 70 millimeters of water gauge.
  • the overall RTD of the aerosol-generating article may be no more than 65 millimeters of water gauge, no more than 60 millimeters of water gauge, or no more than 55 millimeters of water gauge, or no more than 50 millimeters.
  • the overall RTD of the aerosol-generating article may be between 10 millimeters of water gauge and 70 millimeters of water gauge.
  • the overall RTD of the aerosolgenerating article may be between 20 millimeters of water gauge and 65 millimeters of water gauge, between 30 millimeters of water gauge and 60 millimeters of water gauge, between 35 millimeters of water gauge and 55 millimeters of water gauge, or between 40 millimeters of water gauge and 50 millimeters of water gauge.
  • one or more of the components of the aerosolgenerating article are individually circumscribed by their own wrapper.
  • the aerosol-forming substrate portion and the mouthpiece element are individually wrapped.
  • the upstream element, the aerosol-forming substrate portion together with its circumscribing substrate wrapper and the hollow tubular element are then combined together with an outer wrapper. Subsequently, they are combined with the downstream filter element - 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 paper layer may comprise PVOH (polyvinyl alcohol) or silicon.
  • PVOH polyvinyl alcohol
  • the PVOH may be applied to the paper layer as a surface coating, or the paper layer may comprise a surface treatment comprising PVOH or silicon.
  • the aerosol-generating article may comprise a tipping wrapper at least partly circumscribing the aerosol-forming substrate portion and at least partly circumscribing one or more portions of the aerosol-generating article adjacent to the aerosol-forming substrate portion.
  • the one or more adjacent portions may comprise a front plug.
  • the tipping wrapper may be a conventional cigarette paper.
  • the tipping wrapper may have a grammage of below 50 grams per square meter.
  • the tipping wrapper may have a thickness of below 70 micrometers or below 50 micrometers.
  • the tipping wrapper may have a thickness of about 65 micrometers and a grammage of about 45 grams per square meter.
  • the tipping wrapper may be thinner than the substrate wrapper.
  • a ratio of the thickness of the tipping wrapper to the thickness of the substrate wrapper may be 0.7 or less, more preferably 0.5 or less, more preferably 0.3 or less, more preferably 0.2 or less.
  • the aerosol-generating article may comprise ventilation holes.
  • the ventilation holes may promote nucleation of the aerosol.
  • the ventilation holes may assist in cooling the airflow.
  • the ventilation holes may be provided in the FHAT.
  • the FHAT may comprise 11 ventilation holes each having a diameter of 0.11 millimeter.
  • the total resistance to draw of the aerosol-generating article may be between 5 millimeters of water gauge and 200 millimeters of water gauge, preferably between 10 millimeters of water gauge and 150 millimeters of water gauge, more preferably between
  • the aerosol-generating article may have a cylindrical shape.
  • the aerosol-forming substrate portion may have a cylindrical shape.
  • the aerosol-generating article may comprise, in order from a proximal end to a distal end of the article, a mouth-end filter, one or more intermediate elements, an aerosol-forming substrate portion, and, optionally, a front plug.
  • the one or more intermediate elements may comprise one or more of a HAT, a FHAT, and a PI_A plug.
  • the total length of the article may be about 45 millimeters and the length of the length of the aerosol-forming substrate portion may be about 11 millimeters.
  • the tipping wrapper may circumscribe the complete article or only a portion thereof.
  • the aerosol-forming substrate portion may comprise a susceptor.
  • the susceptor may be at least partly circumscribed by the aerosol-forming substrate.
  • the susceptor may be completely surrounded by the aerosol-forming substrate.
  • the susceptor may extend along substantially the entire length of the aerosol-forming substrate portion. This may provide an optimized distribution of heat within the aerosol-forming substrate when the susceptor is heated.
  • the susceptor may comprise a flat planar portion.
  • the susceptor may be a flat planar susceptor strip.
  • the susceptor may comprise a metal or an alloy.
  • the susceptor may comprise aluminum.
  • the term “flat planar” relates to a generally cuboid shape having a height being significantly smaller than a width and a length.
  • the width and length each may be at least twice the height of the cuboid.
  • the height of the flat planar cuboid may also be referred to as the thickness of the susceptor, or of the flat planar portion of the susceptor.
  • the susceptor element may generally have a thickness from 0.01 millimeter to 2 millimeters, for example from 0.5 millimeter to 2 millimeters. In some embodiments, the susceptor element preferably has a thickness from 10 micrometers to 500 micrometers, more preferably from 10 micrometers to 100 micrometers.
  • the susceptor may have a thickness from about 35 micrometers to about 85 micrometers.
  • the susceptor may have a thickness from about 45 micrometers to about 75 micrometers.
  • the susceptor may have a thickness from about 55 micrometers to about 65 micrometers.
  • the susceptor may be an elongate susceptor arranged substantially longitudinally within the aerosol-forming substrate portion.
  • the term “elongate” denotes that the susceptor has a length dimension that is greater than its width dimension or its thickness dimension, for example greater than twice its width dimension or its thickness dimension.
  • the susceptor may be arranged substantially longitudinally within the aerosol-forming substrate portion. This means that the length dimension of the elongate susceptor is arranged to be approximately parallel to the longitudinal direction of the aerosol-forming substrate, for example within plus or minus 10 degrees of parallel to the longitudinal direction of the aerosol-forming substrate.
  • the elongate susceptor may be positioned in a radially central position within the aerosol-forming substrate portion and extend along the longitudinal axis of the aerosol-forming substrate portion.
  • the susceptor may be in the form of a pin, rod, strip or blade.
  • the susceptor may have a length from about 5 millimeters to about 15 millimeters, for example from about 6 millimeters to about 12 millimeters, more preferably from about 8 millimeters to about 10 millimeters.
  • the susceptor may have a length of about 11 millimeters.
  • the susceptor may have a width of at least about 1 millimeters, more preferably at least about 2 millimeters. Typically, the susceptor may have a width of up to 8 millimeters, preferably of less than or equal to about 6 millimeters.
  • the elongate susceptor element has a length which is the same or shorter than the length of the aerosol-forming substrate portion in which it is incorporated.
  • the length of the susceptor element may be 99% or less, 95% or less, 90% or less, 85% or less, 80% or less 70% or less 60% or less, 50% or less of the length of the aerosol-forming substrate portion in which it is incorporated.
  • the length of the susceptor element may be between 70% and 99%, preferably between 75% and 95%, more preferably between 80% and 95%, more preferably between 85% and 95% of the length of the aerosol-forming substrate portion in which it is incorporated.
  • the susceptor When the susceptor has a constant cross-section, for example a circular crosssection, it may have a width or diameter from about 1 millimeter to about 5 millimeters.
  • the strip or blade may have a rectangular cross-section having a width of preferably from about 2 millimeters to about 8 millimeters, more preferably from about 3 millimeters to about 6 millimeters.
  • a susceptor in the form of a strip of blade may have a width of about 4 millimeters.
  • the elongate susceptor may have a thickness from about 57 micrometers to about 63 micrometers. Even more preferably, the elongate susceptor may have a thickness from about 58 micrometers to about 62 micrometers. Most preferably, the elongate susceptor has a thickness of about 60 micrometers.
  • the resistance to draw of the aerosol-forming substrate portion may be between 0.1 millimeters of water gauge and 200 millimeters of water gauge, preferably between 1 millimeters of water gauge and 100 millimeters of water gauge, more preferably between 5 millimeters of water gauge and 40 millimeters of water gauge, more preferably between 10 millimeters of water gauge and 30 millimeters of water gauge, more preferably between 17 millimeters of water gauge and 29 millimeters of water gauge, preferably between 20 millimeters of water gauge and 26 millimeters of water gauge, more preferably about 23 millimeters of water gauge.
  • the resistance to draw of the aerosol-forming substrate portion may be 18 millimeters of water gauge or more.
  • the resistance to draw of the aerosolforming substrate portion may be 23 millimeters of water gauge or more.
  • Having a low resistance to draw of the aerosol-forming substrate portion may mean that there is only little interaction between the airflow and the aerosol-forming substrate such that there is only little aerosolization.
  • Having a high resistance to draw of the aerosol-forming substrate portion may mean that there is there is a substantial influence of the aerosol-forming substrate portion on the overall resistance to draw of the aerosolgenerating article.
  • the resistance to draw of the aerosol-forming substrate portion may vary to some extent from article to article due to manufacturing tolerances. Reducing the influence of the aerosol-forming substrate portion on the overall resistance to draw of the aerosolgenerating article may lead to a more constant resistance to draw between different articles.
  • the resistance to draw of the aerosol-forming substrate portion per millimeter length of the aerosol-forming substrate portion may be between 0.1 millimeter of water gauge and 20 millimeters of water gauge, preferably between 0.2 millimeter of water gauge and 10 millimeters of water gauge, more preferably between 1 millimeter of water gauge and 5 millimeters of water gauge, more preferably between 1.7 millimeters of water gauge and 2.5 millimeters of water gauge, more preferably between 1.9 millimeters of water gauge and 2.3 millimeters of water gauge.
  • the resistance to draw of the aerosol-forming substrate portion per millimeter length along a longitudinal direction of the aerosol-generating article may be about 2.1 millimeters of water gauge.
  • a total length of the aerosol-forming substrate portion may be between 1 millimeter and 30 millimeters, preferably between 5 millimeter and 16 millimeters, more preferably between 9 millimeters and 13 millimeters, more preferably between 10 millimeters and 12 millimeters, in a direction along the longitudinal axis of the aerosol-generating article.
  • a total length of the aerosol-forming substrate portion may be 11 millimeters or less in a direction along the longitudinal axis of the aerosol-generating article.
  • a total length of aerosol-generating article may be between 10 millimeters and 150 millimeters, preferably, between 20 millimeters and 1000 millimeters, more preferably between 30 millimeters and 80 millimeters, more preferably between 40 millimeters and 50 millimeters, more preferably between 43 millimeters and 47 millimeters, more preferably about 45 millimeters.
  • a length of the aerosol-forming substrate along a longitudinal direction of the article may be between 22% and 26% of the total length of the aerosol-generating article, preferably about 24% of the total length of the aerosol-generating article.
  • a ratio between the total length of the aerosol-forming substrate portion and an overall length of the aerosol-generating article may be at least 0.20.
  • a ratio between the total length of the aerosol-forming substrate portion and an overall length of the aerosol-generating article is at least 0.25. More preferably, a ratio between the total length of the aerosol-forming substrate portion and an overall length of the aerosol-generating article is at least 0.30.
  • a ratio between the total length of the aerosol-forming substrate portion and an overall length of the aerosol-generating article is preferably less than or equal to 0.60.
  • a ratio between the total length of the aerosol-forming substrate portion and an overall length of the aerosol-generating article is less than or equal to 0.55. More preferably, a ratio between the total length of the aerosol-forming substrate portion and an overall length of the aerosol-generating article is less than or equal to 0.50.
  • a ratio between the total length of the aerosol-forming substrate portion and an overall length of the aerosol-generating article is from 0.20 to 0.60, preferably from 0.20 to 0.55, more preferably from 0.20 to 0.50. In other embodiments, a ratio between the total length of the aerosol-forming substrate portion and an overall length of the aerosol-generating article is from 0.25 to 0.60, preferably from 0.25 to 0.55, more preferably from 0.25 to 0.50. In further embodiments, a ratio between the total length of the aerosol-forming substrate portion and an overall length of the aerosol-generating article is from 0.30 to 0.60, preferably from 0.30 to 0.55, more preferably from 0.30 to 0.50.
  • the terms “external diameter” and “outer diameter” of the aerosolgenerating article, or a component thereof, may be calculated as the average of a plurality of measurements of the diameter of the aerosol-generating article, or the component thereof, taken at different locations along the length of the aerosol-generating article, or the component thereof.
  • the aerosol-generating article has an external diameter of at least about 5 millimeters. More preferably, the aerosol-generating article has an external diameter of at least 5.25 millimeters. Even more preferably, the aerosol-generating article has an external diameter of at least 5.5 millimeters.
  • the aerosol-generating article preferably has an external diameter of less than or equal to 8 millimeters. More preferably, the aerosol-generating article has an external diameter of less than or equal to 7.5 millimeters. Even more preferably, the aerosolgenerating article has an external diameter of less than or equal to 7 millimeters.
  • the aerosol-generating article has a substantially circular cross-section.
  • the aerosol-generating article has a substantially uniform cross-section along the entire length of the aerosol-generating article.
  • the total density of the aerosol-forming substrate portion may be more than 0.71 milligrams per cubic millimeter.
  • the total density of the aerosol-forming substrate portion may be 0.715 milligrams per cubic millimeter or more.
  • the total density of the aerosol-forming substrate portion may be 0.720 milligrams per cubic millimeter or more.
  • the total density of the aerosol-forming substrate portion may be about 0.725 milligrams per cubic millimeter.
  • the substrate wrapper may circumscribe a cylindrical volume of 6.77 millimeters in diameter and 11 millimeters in length, i.e. a volume of 396 cubic millimeters.
  • the volume may be filled with aerosol-forming substrate and a susceptor.
  • the total mass of aerosol-forming substrate within the aerosol-forming substrate portion may be 266 milligrams and the total mass of susceptor material within the aerosol-forming substrate portion may be 21.2 milligrams.
  • the total density of the aerosol-forming substrate portion then corresponds to 287.2 milligrams divided by 396 cubic millimeters, i.e. 0.725 milligrams per cubic millimeter.
  • the total density of the aerosol-generating article at the longitudinal position of the aerosol-forming substrate portion may be about 0.66 milligrams per cubic millimeter.
  • a ratio of the total density of the aerosol-forming substrate portion divided by the total density of the of the aerosol-generating article at the longitudinal position of the aerosolforming substrate portion may be greater than 1.0, preferably greater than 1.05, more preferably 1.09 or greater.
  • At least 70 percent by volume, preferably at least 75 percent by volume, more preferably at least about 79 percent by volume, of the inner volume of the aerosol-forming substrate portion may be filled with aerosol-forming substrate and, optionally, one or more susceptor elements.
  • Less than 30 percent by volume, preferably less than 25 percent by volume, more preferably about 21 percent by volume or less, of the inner volume of the aerosol-forming substrate portion may be empty.
  • the total mass of aerosol-forming substrate in the aerosol-forming substrate portion may be less than 300 milligrams, preferably less than 290 milligrams.
  • the total mass of aerosol-forming substrate in the aerosol-forming substrate portion may be about 266 milligrams.
  • the total mass of aerosol-forming substrate in the aerosol-forming substrate portion may be between 10 milligrams and 3000 milligrams, preferably between 50 milligrams and 1000 milligrams, more preferably between 100 milligrams and 500 milligrams, more preferably between 200 milligrams and 400 milligrams, more preferably between 250 milligrams and 350 milligrams, more preferably between 260 milligrams and 270 milligrams, more preferably between 263 milligrams and 269 milligrams.
  • the aerosol-forming substrate portion may comprise aerosol-forming substrate and a susceptor.
  • the total mass of susceptor material in the aerosol-forming substrate portion may be between 1 milligrams and 100 milligrams, preferably between 5 milligrams and 50 milligrams, more preferably between 10 milligrams and 40 milligrams, more preferably between 15 milligrams and 25 milligrams, more preferably between 20 milligrams and 23 milligrams, more preferably between 20.5 milligrams and 21.7 milligrams.
  • the aerosol-forming substrate portion may comprise aerosol-forming substrate and a susceptor, and the total mass of susceptor material in the aerosol-forming substrate portion may be between 20.5 milligrams and 21.7 milligrams and the total mass of aerosol-forming substrate in the aerosol-forming substrate portion may be between 263 milligrams and 269 milligrams.
  • the density of the aerosol-forming substrate may be more than 800 kilograms per cubic meter, preferably more than 825 kilograms per cubic meter, more preferably may be about 842 kilograms per cubic meter.
  • the aerosol-forming substrate may be provided in form of a sheet.
  • the sheet of aerosol-forming substrate may be gathered upon insertion into the aerosol-forming substrate portion.
  • the density of the sheet of aerosol-forming substrate may be determined by dividing the grammage of the sheet by the thickness of the sheet before gathering the sheet.
  • the aerosol-forming substrate may be provided in form of a gathered sheet of homogenized tobacco material.
  • the sheet of homogenized tobacco material may have a grammage of less than 210 grams per square meter, preferably less than 200 grams per square meter, more preferably about 192 grams per square meter.
  • the sheet of homogenized tobacco material may have a thickness of more than 215 micrometers, preferably more than 220 micrometers, more preferably about 228 micrometers.
  • the sheet of homogenized tobacco material may be a casted sheet.
  • the homogenized tobacco material may comprise, prior to the casting process, tobacco particles having an average particle size (D95) of more than 50 micrometers, preferably between more than 50 micrometers and less than 100 micrometers, more preferably between 60 micrometers and 80 micrometers, more preferably between 65 micrometers and 75 micrometers, more preferably about 70 micrometers.
  • This tobacco particle size (D95) may result in a roughened surface of the sheet. This may result in an increased surface area of the sheet. An increased surface may improve aerosol ization.
  • the term “average particle size (D95)” is used to denote the volume-basis median value of the particle size distribution and is the value of the particle diameter at 95% in the cumulative distribution.
  • the particle size of the particles can be analyzed by laser diffraction method.
  • the aerosol-forming substrate portion may define a substantially cylindrical shape.
  • the cylindrical shape of the aerosol-forming substrate portion may have a diameter in a range from about 3 millimeters to about 10 millimeters, preferably from about 6 millimeters to about 8 millimeters, more preferably from about 6.5 millimeters to about 7.5 millimeters, more preferably from about 6.6 millimeters to about 7.0 millimeters, more preferably from about 6.7 millimeters to about 6.9 millimeters, more preferably from about 6.75 millimeters to about 6.85 millimeters.
  • the cylindrical shape of the aerosol-forming substrate portion may have a diameter in a range from about 6.8 millimeters to about 7.1 millimeters, or from about 6.8 millimeters to about 7.0 millimeters.
  • the invention further relates to a package comprising a plurality of aerosol-generating articles, wherein each aerosol-generating article in the package is an aerosol-generating article as described herein.
  • the invention further relates to an aerosol-generating system comprising the aerosolgenerating article as described herein and an aerosol-generating device.
  • the aerosolgenerating device may comprise a heating chamber configured for at least partly inserting the aerosol-generating article into the heating chamber.
  • the aerosol-generating device may comprise an internal heating element arranged for being inserted into the aerosol-generating article, when the aerosol-generating article is at least partly inserted into the heating chamber.
  • the aerosol-generating device may comprise an inductor coil.
  • the inductor coil may at least partly circumscribe the heating chamber.
  • the inductor coil may be arranged to coaxially circumscribe the heating chamber.
  • the inductor coil may be arranged to inductively heat a susceptor element.
  • the susceptor element may be part of an internal heating element of the aerosol-generating device.
  • the susceptor element may be part of the aerosol- generating article.
  • the inductor coil may be arranged to inductively heat a susceptor of the aerosol-generating article when the aerosol-generating article is at least partly inserted into the heating chamber.
  • an aerosol-generating article refers to an article comprising an aerosol-forming substrate that is capable of releasing volatile compounds that can form an aerosol.
  • An aerosol-generating article may be disposable.
  • An aerosol-generating article comprising an aerosol-forming substrate comprising tobacco may be referred to herein as a tobacco stick.
  • aerosol-generating device refers to a device that interacts with an aerosol-forming substrate to generate an aerosol.
  • An aerosol-generating device may interact with one or both of an aerosol-generating article comprising an aerosol-forming substrate, and a cartridge comprising an aerosol-forming substrate.
  • the aerosol-generating device may heat the aerosol-forming substrate to facilitate release of volatile compounds from the substrate.
  • An electrically operated aerosol-generating device may comprise an atomiser, such as an electric heater, to heat the aerosol-forming substrate to form an aerosol.
  • aerosol-generating system refers to the combination of an aerosol-generating device with an aerosol-forming substrate.
  • aerosol-generating system refers to the combination of the aerosol-generating device with the aerosol-generating article.
  • the aerosol-forming substrate and the aerosol-generating device cooperate to generate an aerosol.
  • tubular element is used to denote an elongate element defining a lumen or airflow passage along a longitudinal axis thereof.
  • tubular is used herein to encompass any tubular element having a substantially cylindrical cross-section and defining at least one airflow passage establishing an uninterrupted fluid communication between an upstream end of the tubular element and a downstream end of the tubular element.
  • tubular element may be possible.
  • Aerosol generating articles comprise a proximal end through which, in use, an aerosol exits the article.
  • the proximal end of the aerosol generating article may also be referred to as the mouth end or the downstream end.
  • the mouth end is downstream of the distal end.
  • 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 end of the aerosol generating article and the distal end of the aerosol generating article.
  • the front of a component, or portion of a component, of the aerosol generating article is the portion at the end closest to the upstream end of the aerosol generating article.
  • the rear of a component, or portion of a component, of the aerosol generating article is the portion at the end closest to the downstream end of the aerosol generating article.
  • the term “longitudinal” refers to the direction corresponding to the main longitudinal axis of the aerosol-generating article, which extends between the upstream and downstream ends of the aerosol-generating article.
  • length denotes the dimension of a component of the aerosol-generating article in the longitudinal direction.
  • length may be used to denote the dimension of the rod or of the elongate tubular elements in the longitudinal direction.
  • transverse is used to describe the direction perpendicular to the longitudinal direction. Unless otherwise stated, references to the “cross-section” of the aerosol-generating article or a component of the aerosol-generating article refer to the transverse cross-section.
  • proximal refers to a user-end, or mouth-end of the aerosolgenerating article
  • distal refers to the end opposite to the proximal end
  • Components of aerosol-generating articles according to the present invention may be described as being upstream or downstream of one another based on their relative positions between the proximal end of the aerosol-generating article and the distal end of the aerosolgenerating article.
  • the aerosol-generating article may comprise one or more susceptor elements.
  • the one or more susceptor elements may be comprised within the aerosol-forming substrate portion.
  • one or more elongate susceptor elements may be arranged substantially longitudinally within the aerosol-forming substrate portion and in thermal contact with the aerosol-forming substrate.
  • a “susceptor” or “susceptor element” means an element that heats up when subjected to an alternating magnetic field. This may be the result of eddy currents induced in the susceptor element, hysteresis losses, or both eddy currents and hysteresis losses.
  • the susceptor element is located in thermal contact or close thermal proximity with an aerosol-forming substrate received in the aerosol-generating device or cartridge. In this manner, the aerosol-forming substrate is heated by the susceptor such that an aerosol is formed.
  • 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-forming substrate.
  • Preferred susceptor elements comprise a metal or carbon.
  • a preferred susceptor element may comprise or consist of a ferromagnetic material, for example a ferromagnetic alloy, ferritic iron, or a ferromagnetic steel or stainless steel.
  • a suitable susceptor element may be, or comprise, aluminium.
  • Suitable susceptor elements may comprise a non-metallic core with a metal layer disposed on the non-metallic core, for example metallic tracks formed on a surface of a ceramic core.
  • a susceptor element may have a protective external layer, for example a protective ceramic layer or protective glass layer encapsulating the susceptor element.
  • the susceptor element may comprise a protective coating formed by a glass, a ceramic, or an inert metal, formed over a core of susceptor element material.
  • the susceptor element may be arranged in thermal contact with the aerosol-forming substrate of the aerosol-forming substrate portion in which the susceptor element is incorporated. Thus, when the susceptor element heats up the aerosol-forming substrate is heated up and an aerosol is formed.
  • the susceptor element is arranged in direct physical contact with the aerosol-forming substrate, for example within the aerosol-forming substrate.
  • the aerosol-generating device suitable for use with an aerosol-generating article as described herein may comprise a heating chamber for receiving at least part of the aerosolgenerating article and a heater for heating the aerosol-forming substrate portion of the aerosol-generating article when the aerosol-generating article is received within the heating chamber.
  • the aerosol-generating device has a distal end and a mouth end.
  • the aerosolgenerating device may comprise a body or housing.
  • the body or housing of the aerosolgenerating device may define a device cavity for removably receiving the aerosol-generating article at the mouth end of the device.
  • the device cavity may be referred to as the heating chamber of the aerosolgenerating device.
  • the device cavity may extend between a distal end and a mouth, or proximal, end.
  • the distal end of the device cavity may be a closed end and the mouth, or proximal, end of the device cavity may be an open end.
  • An aerosol-generating article may be inserted into the device cavity, or heating chamber, via the open end of the device cavity.
  • the device cavity may be cylindrical in shape so as to conform to the same shape of an aerosol-generating article.
  • the expression “received within” may refer to the fact that a component or element is fully or partially received within another component or element.
  • the expression “aerosol-generating article is received within the device cavity” refers to the aerosolgenerating article being fully or partially received within the cavity of the aerosol-generating device.
  • the aerosol-generating article may abut the distal end of the device cavity.
  • the aerosol-generating article may be in substantial proximity to the distal end of the device cavity.
  • the distal end of the device cavity may be defined by an end-wall.
  • the length of the device cavity may be between 15 millimeters and 80 millimeters, or between 20 millimeters and 70 millimeters, or between 25 millimeters and 60 millimeters, or between 25 millimeters and 50 millimeters.
  • the length of the device cavity may be the same as or greater than the length of the aerosol-forming substrate portion.
  • the length of the device cavity may be the same as or greater than the combined length of the upstream section or element and aerosol-forming substrate portion.
  • the length of the device cavity is such that at least 75 percent of the length of the aerosol-forming substrate portion is inserted or received within the device cavity, when the aerosol-generating article is received with the aerosolgenerating device. More preferably, the length of the device cavity is such that at least 80 percent of the length of the aerosol-forming substrate portion is inserted or received within the device cavity, when the aerosol-generating article is received with the aerosol-generating device.
  • the length of the device cavity is such that at least 90 percent of the length of the aerosol-forming substrate portion 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 aerosol-forming substrate portion along which the aerosolforming substrate can be heated during use, thereby optimising the generation of aerosol from the aerosol-forming substrate and reducing tobacco waste.
  • the length of the device cavity may be such that the downstream section or a portion thereof is configured to protrude from the device cavity, when the aerosol-generating article received within the device cavity.
  • the length of the device cavity may be such that a portion of the downstream section (such as the hollow tubular cooling element or downstream filter segment) is configured to protrude from the device cavity, when the aerosol-generating article received within the device cavity.
  • the length of the device cavity may be such that a portion of the downstream section (such as the hollow tubular cooling element or downstream filter segment) is configured to be received within the device cavity, when the aerosol-generating article received within the device cavity.
  • At least 25 percent of the length of the downstream section may be inserted or received within the device cavity, when the aerosol-generating article is received within the device. At least 30 percent of the length of the downstream section may be inserted or received within the device cavity, when the aerosol-generating article is received within the device.
  • a diameter of the device cavity may be between 4 millimeters and 10 millimeters.
  • a diameter of the device cavity may be between 5 millimeters and 9 millimeters.
  • a diameter of the device cavity may be between 6 millimeters and 8 millimeters.
  • a diameter of the device cavity may be between 6 millimeters and 7 millimeters.
  • a diameter of the device cavity may be substantially the same as or greater than a diameter of the aerosol-generating article.
  • a diameter of the device cavity may be the same as a diameter of the aerosol-generating article in order to establish a tight fit with the aerosolgenerating article.
  • 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 aerosolgenerating 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.
  • Such a tight fit may establish an airtight fit or configuration between the device cavity and an aerosol-generating article received therein.
  • the tight fit with an aerosol-generating article may be established along the entire length of the device cavity or along a portion of the length of the device cavity.
  • 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 aerosolgenerating 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 When an aerosol-generating article is received within the device cavity, 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 airflow 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 air-flow channel of the aerosol-generating device may extend from an inlet located at the mouth end, or proximal end, of the aerosol-generating device to an outlet located away from mouth end of the device.
  • the air-flow channel may extend along a direction parallel to the longitudinal axis of the aerosol-generating device.
  • the heater may be any suitable type of heater.
  • the heater is an external heater.
  • the heater is located at or about the periphery of the heating chamber.
  • the heater externally heats the aerosol-forming substrate portion when the aerosol-generating article is 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 is arranged to heat the outer surface of the aerosol-forming substrate portion.
  • the heater is arranged for insertion into an aerosol-forming substrate when the aerosol-forming substrate is received within the cavity.
  • the heater may be positioned within the device cavity, or heating chamber.
  • 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.
  • 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, Timetai® and iron- manganese-aluminium based alloys.
  • the at least one resistive heating element comprises one or more stamped portions of electrically resistive material, such as stainless steel.
  • the at least one resistive heating element may comprise a heating wire or filament, for example a Ni-Cr (Nickel-Chromium), platinum, tungsten or alloy wire.
  • 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 (AI2O3) or Zirconia (ZrO2).
  • the electrically insulating substrate has a thermal conductivity of less than or equal to about 40 Watts per meter Kelvin, preferably less than or equal to about 20 Watts per meter Kelvin and ideally less than or equal to about 2 Watts per meter Kelvin.
  • the heater may comprise a heating element comprising a rigid electrically insulating substrate with one or more electrically conductive tracks or wire disposed on its surface.
  • the size and shape of the electrically insulating substrate may allow it to be inserted directly into an aerosol-forming substrate. If the electrically insulating substrate is not sufficiently rigid, the heating element may comprise a further reinforcement means. A current may be passed through the one or more electrically conductive tracks to heat the heating element and the aerosol-forming substrate.
  • 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.
  • a susceptor element may be arranged such that, when the aerosol-generating article is received in the cavity of the aerosol-generating device, the oscillating electromagnetic field generated by the inductor coil induces a current in the susceptor element, causing the susceptor element to heat up.
  • the aerosol-generating device is preferably capable of generating a fluctuating electromagnetic field having a magnetic field strength (H-field strength) of between 1 and 5 kilo amperes per meter (kA m), preferably between 2 and 3 kA/m, for example about 2.5 kA/m.
  • the electrically-operated aerosol-generating device is preferably capable of generating a fluctuating electromagnetic field having a frequency of between 1 and 30 MHz, for example between 1 and 10 MHz, for example between 5 and 7 MHz.
  • the susceptor element is preferably located in contact with the aerosol-forming 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-forming substrate.
  • the susceptor element may comprise any suitable material, as described above in relation to a susceptor element incorporated within the aerosol-forming substrate portion.
  • the aerosol-generating device may comprise at least one resistive heating element and at least one inductive heating element. In some embodiments the aerosol-generating device may comprise a combination of resistive heating elements and inductive heating elements.
  • the heater may be controlled to operate within a defined operating temperature range, below a maximum operating temperature.
  • An operating temperature range between about 150 degrees Celsius and about 300 degrees Celsius in the heating chamber (or device cavity) is preferable.
  • the operating temperature range of the heater may be between about 150 degrees Celsius and about 250 degrees Celsius.
  • the aerosol-generating device may comprise a power supply.
  • the power supply may be a DC power supply.
  • the power supply is a battery.
  • 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 or a lithium-polymer battery.
  • 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 allows for the storage of enough energy for one or more user operations, for example one or more aerosol-generating experiences.
  • Example E1 An aerosol-generating article, comprising an aerosol-forming substrate in an aerosol-forming substrate portion; and a substrate wrapper at least partly circumscribing the aerosol-forming substrate portion, wherein the substrate wrapper has a thickness of 50 micrometers or more, wherein the substrate wrapper does not extend beyond ends of the aerosol-forming substrate portion in a longitudinal direction of the aerosol-generating article, and wherein the aerosol-forming substrate comprises an aerosol former content of at least 35 percent by weight.
  • Example E2 An aerosol-generating article, comprising an aerosol-forming substrate in an aerosol-forming substrate portion; and a substrate wrapper at least partly circumscribing the aerosol-forming substrate portion, wherein the substrate wrapper has a thickness of 50 micrometers or more, wherein the substrate wrapper comprises one or more layers having the same length in a longitudinal direction of the aerosol-generating article, and wherein the aerosol-forming substrate comprises an aerosol former content of at least 35 percent by weight.
  • Example E3 The aerosol-generating article according to Example E2, wherein the combination of all of the one or more layers of the substrate wrapper having the same length defines an overall thickness of the substrate wrapper of 50 micrometers or more.
  • Example E4 The aerosol-generating article according to Example E2 or Example E3, wherein at least one of the one or more layers of the substrate wrapper has an individual thickness of 50 micrometers or more.
  • Example E5 The aerosol-generating article according to Example E4, wherein each of the one or more layers of the substrate wrapper having the same length has an individual thickness of 50 micrometers or more.
  • Example E6 The aerosol-generating article according to any of Examples E2 to Example E5, wherein the substrate wrapper does not extend beyond longitudinal ends of the aerosol-forming substrate portion in the longitudinal direction of the aerosol-generating article.
  • Example E7 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper has a thickness of 60 micrometers or more, preferably 70 micrometers or more, more preferably 75 micrometers or more, more preferably 90 micrometers or more, more preferably 120 micrometers or more, more preferably 145 micrometers or more.
  • Example E8 The aerosol-generating article according to Example E7, wherein the substrate wrapper has a thickness of between 140 micrometers and 160 micrometers.
  • Example E9 The aerosol-generating article according to any of the preceding examples, wherein a ratio of substrate wrapper thickness to aerosol-forming substrate portion diameter is in a range from about 1:120 to about 1:20, or about 1:100 to about 1:30, or about 1 :80 to about 1 :35, or about 1 :60 to about 1 :40.
  • Example E10 The aerosol-generating article according to any of the preceding examples, wherein a density of the substrate wrapper is 800 kilograms per cubic meter or less, preferably 750 kilograms per cubic meter or less, more preferably 700 kilograms per cubic meter or less, more preferably 650 kilograms per cubic meter or less, more preferably 600 kilograms per cubic meter or less, more preferably 550 kilograms per cubic meter or less, more preferably 500 kilograms per cubic meter or less, more preferably 450 kilograms per cubic meter or less, more preferably 400 kilograms per cubic meter or less, more preferably 350 kilograms per cubic meter or less, more preferably is about 320 kilograms per cubic meter.
  • Example E11 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper has a basis weight of less than 60 grams per square meter.
  • Example E12 The aerosol-generating article according to Example E11 , wherein the substrate wrapper has a basis weight of more than 28 grams per square meter and less than 50 grams per square meter.
  • Example E13 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper has a thickness of more than 145 micrometers and a density of 400 kilograms per cubic meter or less.
  • Example E14 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper is perforated.
  • Example E15 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper is embossed.
  • Example E16 The aerosol-generating article according to any of Examples E1 to E13, wherein the substrate wrapper has a uniform thickness that does not differ at any point by more than about 30 micrometers, or more than about 20 micrometers, or more than about 10 micrometers, or more than about 5 micrometers.
  • Example E17 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper exhibits a permeability of the wrapper in a range from 4000 CORESTA units to 4800 CORESTA units, preferably from 4200 CORESTA units to 4600 CORESTA units, more preferably from 4300 CORESTA units to 4500 CORESTA units, wherein the permeability of cigarette paper is determined by utilizing the International Standard test method ISO 2965:2009 and the result is presented as cubic centimeters per minute per square centimeters and referred to as “CORESTA units”.
  • Example E18 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper has a roughness of between about 50 Bekk seconds and about 1000 Bekk seconds, preferably between about 100 Bekk seconds and about 200 Bekk seconds.
  • Example E19 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper extends along the entire length of the aerosolforming substrate portion in a direction parallel to the longitudinal direction of the aerosolgenerating article.
  • Example E20 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper comprises one or more of cardboard, plastics, and metal foil.
  • Example E21 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper comprises a cellulosic material, for example one or more of paper, wood, textile, natural fibers, and artificial fibers.
  • the substrate wrapper comprises a cellulosic material, for example one or more of paper, wood, textile, natural fibers, and artificial fibers.
  • Example E22 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper comprises a paper layer.
  • Example E23 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper comprises a laminate sheet, preferably, wherein the substrate wrapper is made of a laminate sheet, more preferably, wherein the laminate sheet is a laminate of a paper layer with an aluminum layer.
  • Example E24 The aerosol-generating article according to any of the preceding examples, wherein the substrate wrapper is formed from a single continuous sheet, preferably a single paper sheet.
  • Example E25 The aerosol-generating article according to any of Examples E1 to E23, wherein the substrate wrapper is a substrate wrapper system formed from a first individual wrapper sheet and a second individual wrapper sheet, wherein the first individual wrapper sheet comprises a first overlapping region formed by overlapping opposing end portions of the first individual wrapper sheet, wherein the second individual wrapper sheet comprises a second overlapping region formed by overlapping opposing end portions of the second individual wrapper sheet, and wherein the first overlapping region is offset from the second overlapping region by at least about 5 percent, preferably at least about 10 percent, more preferably by at least about 15 percent, more preferably about 40 percent to about 60 percent of a circumference of the aerosol-forming substrate portion.
  • the substrate wrapper is a substrate wrapper system formed from a first individual wrapper sheet and a second individual wrapper sheet
  • the first individual wrapper sheet comprises a first overlapping region formed by overlapping opposing end portions of the first individual wrapper sheet
  • the second individual wrapper sheet comprises a second overlapping region formed
  • Example E26 The aerosol-generating article according to any of the preceding examples, wherein a total length of the aerosol-forming substrate portion is 11 millimeters or less.
  • Example E27 The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate portion defines a substantially cylindrical shape having a diameter in a range from about 6.8 millimeters to about 7.1 millimeters, or from about 6.8 millimeters to about 7.0 millimeters.
  • Example E28 The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate portion comprises a susceptor, preferably wherein the susceptor is at least partly circumscribed by the aerosol-forming substrate.
  • Example E29 The aerosol-generating article according to any of the preceding examples, wherein the total aerosol former content of the aerosol-forming substrate is at least 40 percent by weight, preferably at least 45 percent by weight, more preferably at least 50 percent by weight, more preferably at least 55 percent by weight.
  • Example E30 The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate comprises nicotine, one or more cellulose based agents, one or more aerosol formers, and one or more carboxylic acids.
  • Example E31 The aerosol-generating article according to Example E30, wherein the one or more carboxylic acids is selected from fumaric acid, maleic acid, and malic acid, preferably wherein the one or more carboxylic acids is selected from fumaric acid and maleic acid, more preferably wherein the one or more carboxylic acids is fumaric acid.
  • Example E32 The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate comprises one or more carboxylic acids selected from acetic acid, benzoic acid, lactic acid, and levulinic acid.
  • Example E33 The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate has a total cellulose based agent content of between 35 percent by weight and 50 percent by weight.
  • Example E34 The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate comprises one or more cellulose based film-forming agents selected from carboxymethyl cellulose and hydroxypropyl methylcellulose.
  • Example E35 The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate comprises one or more cellulose based strengthening agents selected from cellulose fibres, microcrystalline cellulose and cellulose powder.
  • Example E36 The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate is a solid aerosol-forming film, preferably wherein the solid aerosol-forming film remains solid when heated to a temperature of between 180 degrees Celsius and 350 degrees Celsius.
  • Example E37 The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate is provided in form of a gel.
  • Example E38 The aerosol-generating article according to any of the preceding examples, wherein the aerosol-forming substrate is tobacco-free.
  • Example E39 An aerosol-generating system comprising the aerosol-generating article according to any of the preceding examples and an aerosol-generating device comprising a heating chamber configured for at least partly inserting the aerosol-generating article into the heating chamber.
  • Figs. 1a and 1b show aerosol-generating articles
  • Figs. 2a and 2b show aerosol-generating articles
  • Figs. 3a and 3b show aerosol-generating articles.
  • Fig. 1a shows an aerosol-generating article in a cross-sectional view.
  • the aerosolgenerating article comprises a mouth-end filter 10 located at a proximal end of the article.
  • the article further comprises a PLA (poly lactic acid) plug 12, a hollow acetate tube 14, and an aerosol-forming substrate portion 16 comprising an aerosol-forming substrate.
  • the aerosol-forming substrate comprises an aerosol former content of at least 35 percent by weight.
  • the mouth-end filter 10, PI_A plug 12, and the hollow acetate tube 14 form a downstream section downstream of the aerosol-forming substrate portion 16.
  • the article is circumscribed by an outer wrapper 18, for example a tipping wrapper.
  • a center axis 22 extends centrally along a longitudinal direction of the aerosol-generating article.
  • the aerosol- forming substrate portion 16 is circumscribed by a thick substrate wrapper 24. The substrate wrapper 24 does not extend beyond longitudinal ends of the aerosol-forming substrate portion 16 in a direction parallel to the center axis 22
  • Fig. 1b shows an aerosol-generating article in a cross-sectional view.
  • the article of Fig. 1b is identical to the article of Fig. 1a with the exception that the article of Fig. 1b further comprises a flat planar susceptor 20.
  • the flat planar susceptor 20 is arranged within the aerosol-forming substrate portion 16 and is circumscribed by the aerosol-forming substrate.
  • Fig. 2a shows an aerosol-generating article in a cross-sectional view.
  • the article of Fig. 2a comprises a mouth-end filter 10, a fine hollow acetate tube 38, a hollow acetate tube 40, an aerosol-forming substrate portion 16 comprising aerosol-forming substrate, and a front plug 42.
  • the aerosol-forming substrate comprises an aerosol former content of at least 35 percent by weight.
  • the mouth-end filter 10, the fine hollow acetate tube 38, and the hollow acetate tube 40 form a downstream section downstream of the aerosol-forming substrate portion 16.
  • the front plug 42 forms an upstream section upstream of the aerosol-forming substrate portion 16.
  • the aerosol-forming substrate portion 16 may comprise an optional susceptor 20.
  • the front plug 42 may be a filter plug.
  • a distal portion of the article is circumscribed by a tipping wrapper 18 and a proximal portion is circumscribed by a mouthpiece wrapper 44.
  • a circumferential row of ventilation holes 46 is provided in an area where the mouthpiece wrapper 44 overlaps the tipping wrapper 18.
  • the ventilation holes 46 may be provided in one or both of the fine hollow acetate tube 38, the mouthpiece wrapper 44, and the tipping wrapper 18.
  • the aerosol-forming substrate portion 16 is circumscribed by a thick substrate wrapper 24.
  • An outer diameter of the article may be about 7 millimeters, preferably 7.1 millimeters.
  • a total length of the article may be about 45 millimeters.
  • a length of the mouth-end filter 10 is about 12 millimeters
  • a length of the fine hollow acetate tube 38 is about 9 millimeters
  • a length of the hollow acetate tube 40 is about 8 millimeters
  • a length of the aerosol-forming substrate portion 16 is about 11 millimeters
  • a length of the front plug 42 is about 5 millimeters.
  • Fig. 2b shows an aerosol-generating article in a cross-sectional view.
  • the aerosolgenerating article of Fig. 2b may have an overall length of about 75 millimeters and an external diameter of about 6.7 millimeters.
  • the article of Fig. 2b comprises a hollow mouthpiece tube 48, for example a hollow cylindrical tube made of cellulose acetate, at a proximal end of the article.
  • the hollow mouthpiece tube 48 defines an internal cavity that extends all the way from an upstream end of the hollow mouthpiece tube 48 to a downstream end of a mouth-end filter 10.
  • the internal cavity is substantially empty, and so substantially unrestricted airflow is enabled along the internal cavity.
  • the hollow mouthpiece tube 48 does not substantially contribute to the overall RTD of the aerosol-generating article.
  • the length of the hollow mouthpiece tube 48 may be about 6 millimeters and the external diameter may be about 6.7 millimeters.
  • the wall thickness of the hollow mouthpiece tube 48 may be about 1 millimeter.
  • the article further comprises a mouth-end filter 10.
  • the mouth-end filter 10 may have a length of about 10 millimeters.
  • An external diameter of the mouth-end filter 10 may be about 6.7 millimeters.
  • the article further comprises a hollow tube 50, for example a cardboard tube.
  • the hollow tube 50 does not substantially contribute to the overall RTD of the aerosol-generating article.
  • the RTD of the hollow tube 50 is about 0 millimeters of water gauge.
  • the hollow tube 50 may have a length of about 25 millimeters or more, an external diameter of about 6.7 millimeters, and an internal diameter of about 6.2 millimeters.
  • a thickness of a peripheral wall of the hollow tube 50 may be about 0.25 millimeter.
  • the hollow tube 50 may comprise one or more rows of ventilation holes 46 arranged circumferentially around the hollow tube 50 in a cross-section that is substantially perpendicular to a longitudinal axis of the article.
  • a ventilation level of the aerosol-generating article may be about 75 percent.
  • the article comprises an aerosol-forming substrate portion 16 comprising an aerosol-forming substrate.
  • the aerosol-forming substrate comprises an aerosol former content of at least 35 percent by weight.
  • the aerosol-forming substrate portion 16 is circumscribed by a thick substrate wrapper 24.
  • one or more outer wrappers 18, 44 circumscribing at least a portion of the aerosol-generating article may be provided.
  • the one or more outer wrappers 18, 44 may also comprise ventilation holes 46. If present, the outer wrapper 44 may overlie the portion of the outer wrapper 18 that overlies the hollow tube 50. This way, the outer wrapper 44 effectively joins the mouth-end filter 10 to the rest of the components of the article.
  • the width of the outer wrapper 44 may be about 26 millimeters.
  • the aerosol-generating article of Fig. 2b has an overall length of about 80 millimeters and an external diameter of about 6.5 millimeters, the hollow tube 50 has a length of about 25 millimeters or more, the mouth-end filter 10 has a length of about 10 millimeters, and the length of the hollow mouthpiece tube 48 is about 6 millimeters.
  • Fig. 3a shows an aerosol-generating article in a cross-sectional view comprising an aerosol-forming substrate portion 16.
  • the aerosol-forming substrate comprises an aerosol former content of at least 35 percent by weight.
  • the aerosol-forming substrate portion 16 is circumscribed by a thick substrate wrapper 24.
  • a downstream section comprises a hollow tube 50 and a mouth-end filter 10.
  • the hollow tube 50 may comprise one or more rows of ventilation holes 46.
  • An upstream section comprises a front plug 42.
  • the front plug 42 may be may be provided in the form of a filled cylindrical plug of cellulose acetate tow, or may be provided in the form of a hollow cylindrical plug of cellulose acetate tow having a wall thickness of about 1 millimeter.
  • one or more outer wrappers 18, 44 circumscribing at least a portion of the aerosol-generating article may be provided.
  • the aerosol-generating article may have an overall length of about 45 millimeters and an external diameter of about 7.2 millimeters.
  • the overall length of the downstream section may be about 20 millimeters to 30 millimeters.
  • the length of the mouth-end filter 10 may be about 7 millimeters.
  • the overall length of the upstream section may be about 5 millimeters.
  • Fig. 3b shows an aerosol-generating article in a cross-sectional view comprising an aerosol-forming substrate portion 16 at a distal end thereof.
  • the aerosol-forming substrate comprises an aerosol former content of at least 35 percent by weight.
  • the aerosol-forming substrate portion 16 is circumscribed by a thick substrate wrapper 24.
  • a downstream section comprises a hollow tube 50 and a mouth-end filter 10.
  • the hollow tube 50 may comprise one or more rows of ventilation holes 46.
  • the aerosol-generating article of Fig. 3b may have an overall length of about 45 millimeters and an external diameter of about 7.2 millimeters.
  • the hollow tube 50 may have a length of about 20 to 30 millimeters, an external diameter of about 7.2 millimeters, and an internal diameter of about 6.7 millimeters. Thus, a thickness of a peripheral wall of the hollow tube 50 is about 0.25 millimeters.
  • the mouth-end filter 10 may have a length of about 5 millimeters to 7 millimeters and an external diameter of about 7.2 millimeters.
  • the mouth-end filter 10 may comprise a low-density, cellulose acetate filter segment.
  • the RTD of the mouthend filter 10 may be about 8 millimeters of water gauge.
  • the mouth-end filter 10 may be individually wrapped by a plug wrap (not shown). Additionally, one or more outer wrappers 18, 44 circumscribing at least a portion of the aerosol-generating article may be provided.

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Abstract

L'invention concerne un article de génération d'aérosol. L'article de génération d'aérosol comprend un substrat de formation d'aérosol dans une partie de substrat de formation d'aérosol. L'article de génération d'aérosol comprend une enveloppe de substrat entourant au moins partiellement la partie de substrat de formation d'aérosol. L'enveloppe de substrat a une épaisseur supérieure ou égal à 50 micromètres. L'enveloppe de substrat ne s'étend pas au-delà des extrémités de la partie de substrat de formation d'aérosol dans une direction longitudinale de l'article de génération d'aérosol. Le substrat de formation d'aérosol comprend une teneur en agent de formation d'aérosol d'au moins 35 pour cent en poids. L'invention concerne en outre un système de génération d'aérosol.
PCT/EP2023/069642 2022-07-20 2023-07-14 Article de génération d'aérosol avec enveloppe épaisse WO2024017791A1 (fr)

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EP22186038.0 2022-07-20

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020250114A1 (fr) * 2019-06-10 2020-12-17 Philip Morris Products S.A. Enveloppe stable pour article de génération d'aérosol
WO2021105853A1 (fr) * 2019-11-29 2021-06-03 Philip Morris Products S.A. Élément de substrat de génération d'aérosol comportant une couche de papier épaisse
WO2021170670A1 (fr) * 2020-02-28 2021-09-02 Philip Morris Products S.A. Nouveau substrat de génération d'aérosol
US20220039458A1 (en) * 2018-12-06 2022-02-10 Philip Morris Products S.A. Aerosol-generating article with laminated wrapper
WO2022074159A1 (fr) * 2020-10-09 2022-04-14 Philip Morris Products S.A. Article de génération d'aérosol ayant une faible résistance au tirage et une meilleure distribution d'arôme

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220039458A1 (en) * 2018-12-06 2022-02-10 Philip Morris Products S.A. Aerosol-generating article with laminated wrapper
WO2020250114A1 (fr) * 2019-06-10 2020-12-17 Philip Morris Products S.A. Enveloppe stable pour article de génération d'aérosol
WO2021105853A1 (fr) * 2019-11-29 2021-06-03 Philip Morris Products S.A. Élément de substrat de génération d'aérosol comportant une couche de papier épaisse
WO2021170670A1 (fr) * 2020-02-28 2021-09-02 Philip Morris Products S.A. Nouveau substrat de génération d'aérosol
WO2022074159A1 (fr) * 2020-10-09 2022-04-14 Philip Morris Products S.A. Article de génération d'aérosol ayant une faible résistance au tirage et une meilleure distribution d'arôme

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