WO2020089120A1

WO2020089120A1 - Smoking substitute consumable

Info

Publication number: WO2020089120A1
Application number: PCT/EP2019/079280
Authority: WO
Inventors: Chris Lord; Kate FERRIE; Edward Ross SHENTON
Original assignee: Nerudia Ltd
Current assignee: Nerudia Ltd
Priority date: 2018-10-29
Filing date: 2019-10-25
Publication date: 2020-05-07
Anticipated expiration: 2021-04-29

Abstract

An aspect of the present disclosure relates to an aerosol-forming article (e.g. a smoking substitute article such as an HNB consumable) comprising an aerosol-forming substrate and a filter element wherein the filter element comprises a polar solvent such as water. Another aspect of the present disclosure relates to an aerosol-forming article comprising an aerosol-forming substrate and a terminal filter element at the downstream axial end of the article, wherein the terminal filter element comprises an adsorbent additive e.g. activated carbon.

Description

Smoking substitute consumable

The present application claims priority from previous United Kingdom patent application numbers GB1817555.4 and GB1817544.8, both filed on 29 October 2018, the contents of which are incorporated herein.

Field of the Disclosure

The present disclosure relates to a consumable for use in a smoking substitute system and particularly, although not exclusively, to a heat-not-burn (HNB) consumable.

Background

The smoking of tobacco is generally considered to expose a smoker to potentially harmful substances. It is generally thought that a significant amount of the potentially harmful substances are generated through the heat caused by the burning and/or combustion of the tobacco and the constituents of the burnt tobacco in the tobacco smoke itself.

Conventional combustible smoking articles, such as cigarettes, typically comprise a cylindrical rod of tobacco comprising shreds of tobacco which is surrounded by a wrapper, and usually also a cylindrical filter axially aligned in an abutting relationship with the wrapped tobacco rod. The filter typically comprises a filtration material which is circumscribed by a plug wrap. The wrapped tobacco rod and the filter are joined together by a wrapped band of tipping paper that circumscribes the entire length of the filter and an adjacent portion of the wrapped tobacco rod. A conventional cigarette of this type is used by lighting the end opposite to the filter, and burning the tobacco rod. The smoker receives mainstream smoke into their mouth by drawing on the mouth end or filter end of the cigarette.

Combustion of organic material such as tobacco is known to produce tar and other potentially harmful byproducts. There have been proposed various smoking substitute systems (or“substitute smoking systems”) in order to avoid the smoking of tobacco.

Such smoking substitute systems can form part of nicotine replacement therapies aimed at people who wish to stop smoking and overcome a dependence on nicotine.

Smoking substitute systems include electronic systems that permit a user to simulate the act of smoking by producing an aerosol (also referred to as a“vapour”) that is drawn into the lungs through the mouth (inhaled) and then exhaled. The inhaled aerosol typically bears nicotine and/or flavourings without, or with fewer of, the odour and health risks associated with traditional smoking. In general, smoking substitute systems are intended to provide a substitute for the rituals of smoking, whilst providing the user with a similar experience and satisfaction to those experienced with traditional smoking and with combustible tobacco products. Some smoking substitute systems use smoking substitute articles that are designed to resemble a traditional cigarette and are cylindrical in form with a mouthpiece at one end.

The popularity and use of smoking substitute systems has grown rapidly in the past few years. Although originally marketed as an aid to assist habitual smokers wishing to quit tobacco smoking, consumers are increasingly viewing smoking substitute systems as desirable lifestyle accessories.

There are a number of different categories of smoking substitute systems, each utilising a different smoking substitute approach.

One approach for a smoking substitute system is the so-called "heat not burn" (“HNB”) approach in which tobacco (rather than an“e-liquid”) is heated or warmed to release vapour. The tobacco may be leaf tobacco or reconstituted tobacco. The vapour may contain nicotine and/or flavourings. In the HNB approach the intention is that the tobacco is heated but not burned, i.e. the tobacco does not undergo combustion.

A typical HNB smoking substitute system may include a device and a consumable. The consumable may include the tobacco material. The device and consumable may be configured to be physically coupled together. In use, heat may be imparted to the tobacco material by a heating element of the device, wherein airflow through the tobacco material causes moisture in the tobacco material to be released as vapour. A vapour may also be formed from a carrier in the tobacco material (this carrier may for example include propylene glycol and/or vegetable glycerine) and additionally volatile compounds released from the tobacco. The released vapour may be entrained in the airflow drawn through the tobacco.

As the vapour passes through the consumable (entrained in the airflow) from an inlet to a mouthpiece (outlet), the vapour cools and condenses to form an aerosol for inhalation by the user. The aerosol will normally contain the volatile compounds.

In HNB smoking substitute systems, heating as opposed to burning the tobacco material is believed to cause fewer, or smaller quantities, of the more harmful compounds ordinarily produced during smoking. Consequently, the HNB approach may reduce the odour and/or health risks that can arise through the burning, combustion and pyrolytic degradation of tobacco.

There is a need for improved design of HNB consumables to enhance the user experience and improve the function of the HNB smoking substitute system.

The present disclosure has been devised in the light of the above considerations. Summary of the Disclosure

At its most general, a first aspect of the present disclosure relates to an aerosol-forming article e.g. a smoking substitute article such as an HNB consumable with a filter having an adsorbent additive.

According to the first aspect, there is provided an aerosol-forming article (e.g. a smoking substitute article such as an HNB consumable) comprising an aerosol-forming substrate and a terminal filter element at the downstream axial end of the article wherein the terminal filter element comprises an adsorbent additive.

By providing a terminal filter element with an adsorbent, the terminal filter element can remove unwanted/harmful substances of the aerosol drawn through the terminal filter element by the user prior to inhalation. In particular, the adsorbent additive is able to remove unwanted/harmful substances that are not removed by the filter alone.

Optional features will now be set out. These are applicable singly or in any combination with any aspect.

Optionally, the adsorbent additive is selected from one or more of a zeolite, an activated carbon, a silica gel, a clay, a porous polymer and activated alumina. Preferably, the adsorbent additive is activated carbon.

In some embodiments, at least a portion of the adsorbent additive is in the form of a free-flowing powder/granular/fine particle adsorbent. By having the adsorbent additive in the form of smaller flowing particles, a larger surface area and packing density can be achieved.

In some embodiments, at least a portion of the adsorbent additive is in the form of pellets/tablets/pills/beads/fibres. By having the adsorbent additive in the form of larger solid particles, such as pellets, the adsorbent additive can contribute to the structural integrity of the filter and the article.

In some embodiments, the adsorbent additive is provided predominantly within a discrete location within the terminal filter element. For example, at least a portion, or preferably all, of the adsorbent additive is sandwiched between an upstream terminal filter portion and a downstream terminal filter portion. By packing the adsorbent additive between two filter portions at the terminal end of the article, the adsorbent additive is held in place and the amount of adsorbent additive may be varied easily between articles during manufacture without changing the nature of the two filter portions.

The terminal filter element may comprise one or more cavities/holes/voids in which at least a portion, or preferably all, of the adsorbent additive is held. By having one or more cavities/holes/voids in the filter the adsorbent additive can be located in specified pockets and configurations throughout the filter.

In some embodiments, at least a portion, or preferably all, of the adsorbent additive is impregnated in the terminal filter element. By impregnating the terminal filter element with adsorbent additive, the filter element can be prepared beforehand as a standalone portion. Furthermore, there is a decreased chance of adsorbent additive spillage if the structural integrity of the article is compromised.

Optionally, the adsorbent additive is evenly distributed throughout the entire terminal filter element. By distributing the terminal filter element with adsorbent additive throughout, a maximum filtering and adsorbing effect may be achieved.

The adsorbent additive may account for up to 50%, 40%, 30%, 20%, 10%, 5%, 2% or 1 % by mass of the terminal filter element.

The adsorbent additive removes hazardous substances from the aerosol as it passes through the filter element. In particular, the adsorbent additive removes tobacco-specific nitrosamines (TSNAs) from the aerosol. TSNAs include nicotine-derived nitrosamine ketone (NNK), N-nitrosonornicotine (NNN), N'- nitrosoanatabine (NAT) and N-nitrosoanabasine (NAB).

At its most general, a second aspect of the present disclosure relates to an aerosol-forming article e.g. a smoking substitute article such as an HNB consumable with a filter comprising a polar solvent.

According to the second aspect, there is provided an aerosol-forming article (e.g. a smoking substitute article such as an HNB consumable) comprising an aerosol-forming substrate and at least one filter element wherein the at least one filter element comprises a polar solvent.

By providing a filter element comprising a polar solvent, the filter element can remove unwanted/harmful particulate matter in the vapour at the same time as the polar solvent dissolves and removes tobacco- specific nitrosamines (TSNAs) from the vapour. TSNAs include nicotine-derived nitrosamine ketone (NNK), N-nitrosonornicotine (NNN), N'-nitrosoanatabine (NAT) and N-nitrosoanabasine (NAB).

In some embodiments, the polar solvent is one or more polar solvent(s) selected from water and polar organic solvents. In some embodiments, the one or more polar organic solvent(s) is/are selected from ethanol, isopropyl alcohol and dimethylsulfoxide.

The polar solvent may be equally dispersed throughout the filter element. Alternatively it may be provided in discrete locations or may be concentrated in discrete locations (e.g. it may be provided in a axially central portion).

In some embodiments, at least some of the polar solvent may be contained in one or more frangible capsules that are configured to release the polar solvent upon rupture so that polar solvent does not dissipate or evaporate before use. In some embodiments, the or each frangible capsule is a crushable capsule/crush-ball configured to break and release the polar solvent when crushed/broken.

In some embodiments, the or each capsule is a thermally labile capsule configured to melt/deform/rupture and release the polar solvent when heated, such as when a heated aerosol is drawn through the filter element by the user.

In some embodiments, the polar solvent may account for up to 50%, up to 40%, up to 30%, up to 20%, up to 10%, up to 5%, up to 2% or up to 1 % by mass of the filter element.The aerosol-forming article of the first or second aspect is preferably a heat-not-burn (HNB) consumable.

The article/consumable comprises an aerosol-forming substrate which is capable of being heated to release at least one volatile compound that can form an aerosol. The aerosol-forming substrate may be located at the upstream end of the article/consumable.

As used herein, the terms’’upstream” and“downstream” are intended to refer to the flow direction of the vapour/aerosol i.e. with the downstream end of the article/consumable being the mouth end or outlet where the aerosol exits the article/consumable for inhalation by the user. The upstream end of the article/consumable is the opposing end to the downstream end.

In order to generate an aerosol, the aerosol-forming substrate comprises at least one volatile compound that is intended to be vaporised/aerosolised and that may provide the user with a recreational and/or medicinal effect when inhaled. Suitable chemical and/or physiologically active volatile compounds include the group consisting of: nicotine, cocaine, caffeine, opiates and opoids, cathine and cathinone, kavalactones, mysticin, beta-carboline alkaloids, salvinorin A together with any combinations, functional equivalents to, and/or synthetic alternatives of the foregoing.

The aerosol-forming substrate may comprise plant material. The plant material may comprise least one plant material selected from the list including Amaranthus dubius, Arctostaphylos uva-ursi (Bearberry), Argemone mexicana, Arnica, Artemisia vulgaris, Yellow Tees, Galea zacatechichi, Canavalia maritima (Baybean), Cecropia mexicana (Guamura), Oestrum noctumum, Cynoglossum virginianum (wild comfrey), Cytisus scoparius, Damiana, Entada rheedii, Eschscholzia califomica (California Poppy), Fittonia albivenis, Hippobroma longi flora, Humulus japonica (Japanese Hops), Humulus lupulus (Hops), Lactuca virosa (Lettuce Opium), Laggera alata, Leonotis leonurus, Leonurus cardiaca (Motherwort), Leonurus sibiricus (Honeyweed), Lobelia cardinalis, Lobelia infiata (Indian-tobacco), Lobelia siphilitica, Nepeta cataria (Catnip), Nicotiana species (Tobacco), Nymphaea alba (White Lily), Nymphaea caerulea (Blue Lily), Opium poppy, Passiflora incamata (Passionflower), Pedicularis densiflora (Indian Warrior), Pedicularis groeniandica (Elephant's Head), Salvia divinorum, Salvia dorrii (Tobacco Sage), Salvia species (Sage), Scutellaria galericulata, Scutellaria lateriflora, Scutellaria nana, Scutellaria species (Skullcap), Sida acuta (Wireweed), Sida rhombi folia, Silene capensis, Syzygium aromaticum (Clove), Tagetes lucida (Mexican Tarragon), Tarchonanthus camphoratus, Tumera diffusa (Damiana), Verbascum (Mullein), Zamia latifolia (Maconha Brava) together with any combinations, functional equivalents to, and/or synthetic alternatives of the foregoing.

Preferably, the plant material is tobacco. Any type of tobacco may be used. This includes, but is not limited to, flue-cured tobacco, burley tobacco, Maryland Tobacco, dark-air cured tobacco, oriental tobacco, dark-fired tobacco, perique tobacco and rustica tobacco. This also includes blends of the above mentioned tobaccos.

Any suitable parts of the tobacco plant may be used. This includes leaves, stems, roots, bark, seeds and flowers.

The tobacco may comprise one or more of leaf tobacco, stem tobacco, tobacco powder, tobacco dust, tobacco derivatives, expanded tobacco, homogenised tobacco, shredded tobacco, extruded tobacco, cut rag tobacco and/or reconstituted tobacco (e.g. slurry recon or paper recon).

The aerosol-forming substrate may comprise a gathered sheet of homogenised (e.g. paper/slurry recon) tobacco or gathered shreds/strips formed from such a sheet.

In some embodiments, the sheet used to form the aerosol-forming substrate has a grammage greater than or equal to 100 g/m², e.g. greater than or equal to 1 10 g/m² such as greater than or equal to 120 g/m².

The sheet may have a grammage of less than or equal to 300 g/m² e.g. less than or equal to 250 g/m² or less than or equal to 200 g/m².

The sheet may have a grammage of between 120 and 190 g/m².

The aerosol-forming substrate may comprise at least 50 wt% plant material, e.g. at least 60 wt% plant material e.g. around 65 wt% plant material. The aerosol-forming substrate may comprise 80 wt% or less plant material e.g. 75 or 70 wt% or less plant material.

The aerosol-forming substrate may comprise one or more additives selected from humectants, flavourants, fillers, aqueous/ non-aq u eous solvents and binders.

Humectants are provided as vapour generators - the resulting vapour helps carry the volatile active compounds and increases visible vapour. Suitable humectants include polyhydric alcohols (e.g. propylene glycol (PG), triethylene glycol, 1 ,2-butane diol and vegetable glycerine (VG)) and their esters (e.g. glycerol mono-, di- or tri-acetate). They may be present in the aerosol-forming substrate in an amount between 1 and 50 wt%.

The humectant content of the aerosol-forming substrate may have a lower limit of at least 1 % by weight of the plant material, such as at least 2 wt %, such as at least 5 wt %, such as at least 10 wt %, such as at least 20 wt %, such as at least 30 wt %, or such as least 40 wt %.

The humectant content of the aerosol-forming substrate may have an upper limit of at most 50 % by weight of the plant material, such as at most 40 wt %, such as at most 30 wt %, or such as at most 20 wt %.

Preferably, the humectant content is 1 to 40 wt % of the aerosol-forming substrate, such as 1 to 20 wt %

Suitable binders are known in the art and may act to bind together the components forming the aerosolforming substrate. Binders may comprise starches and/or cellulosic binders such as methyl cellulose, ethyl cellulose, hydroxy propyl cellulose, hydroxyethyl cellulose and methyl cellulose, gums such as xanthan, guar, arabic and/or locust bean gum, organic acids and their salts such as alginic acid/ sodium alginate, agar and pectins.

Preferably the binder content is 5 to 10 wt% of the aerosol-forming substrate e.g. around 6 to 8 wt%.

Suitable fillers are known in the art and may act to strengthen the aerosol-forming substrate. Fillers may comprise fibrous (non-tobacco) fillers such as cellulose fibres, lig nocellulose fibres (e.g. wood fibres), jute fibres and combinations thereof.

Preferably, the filler content is 5 to 10 wt% of the aerosol-forming substrate e.g. around 6 to 9 wt%.

The aerosol-forming substrate may comprise an aqueous and/or non-aqueous solvent. In some embodiments, the aerosol forming substrate has a water content of between 5 and 10 wt% e.g. between 6-9 wt% such as between 7-9 wt%.

The flavourant may be provided in solid or liquid form. It may include menthol, liquorice, chocolate, fruit flavour (including e.g. citrus, cherry etc.), vanilla, spice (e.g. ginger, cinnamon) and tobacco flavour. The flavourant may be evenly dispersed throughout the aerosol-forming substrate or may be provided in isolated locations and/or varying concentrations throughout the aerosol-forming substrate.

The aerosol-forming substrate may be formed in a substantially cylindrical shape such that the article/consumable resembles a conventional cigarette. It may have a diameter of between 5 and 10mm e.g. between 6 and 9mm or 6 and 8mm e.g. around 7 mm. It may have an axial length of between 10 and 15mm e.g. between 1 1 and 14mm such as around 12 or 13mm. The aerosol-forming substrate may be circumscribed by a wrapping layer e.g. a paper wrapping layer. The wrapping layer may overlie an inner foil layer or may comprise a paper/foil laminate (with the foil innermost).

In addition to the terminal filter element, the article/consumable of the first aspect may further comprise an upstream filter element.

The filter element comprising the polar solvent of the second aspect may be a terminal filter element provided at the downstream axial end of the article. In this case, there may be an additional, upstream filter element which may, for example, be axially adjacent the aerosol-forming substrate. The upstream filter element may or may not comprise a polar solvent.

The filter element comprising the polar solvent may be an upstream filer element i.e. upstream of the downstream axial end of the article. In this case, there may be an additional, terminal filter element at the downstream axial end of the article. The terminal filter element may or may not comprise a polar solvent.

The or at least one of the filter element(s) or filter portions (e.g. the terminal filter element (portions)/upstream filter element) may be comprised of cellulose acetate or polypropylene tow. The or at least one of the filter element(s) or filter portions (e.g. the terminal filter element (portions)/upstream filter element) may be comprised of activated charcoal. The or at least one of the filter element(s) or filter portions (e.g. the terminal filter element (portions)/upstream filter element) may be comprised of paper. The or at least one of the filter element(s) or filter portions (e.g. the terminal filter element (portions)/upstream filter element) may be comprised of extruded plant material. The or each filter element may be circumscribed with a plug wrap e.g. a paper plug wrap.

The or each filter element/portion may have a substantially cylindrical shape with a diameter substantially matching the diameter of the aerosol-forming substrate (with or without its associated wrapping layer). The axial length of the or each filter element may be less than 20mm, e.g. between 8 and 15mm, for example between 9 and 13 mm e.g. between 10 and 12mm.

The or at least one of the filter element(s) or filter portions may be a solid filter element. The or at least one of the filter element(s) may be a hollow bore filter element. The or each hollow bore filter may have a bore diameter of between 1 and 5 mm, e.g. between 2 and 4 mm or between 2 and 3 mm.

Where there are two filter elements (i.e. an upstream filter element and terminal filter element) they may be adjacent one another or which may be spaced apart. Any filter element(s) upstream of the terminal filter element may be at least partly (e.g. entirely) circumscribed by the (paper) wrapping layer.

The terminal filter element (at the downstream end of the article/consumable) may be joined to the upstream elements forming the article/consumable by a circumscribing tipping layer e.g. a tipping paper layer. The tipping paper may have an axial length longer than the axial length of the terminal filter element such that the tipping paper completely circumscribes the terminal filter element plus the wrapping layer surrounding any adjacent upstream element.

The or at least one of the filter elements e.g. the terminal filter element may include a capsule e.g. a crushable capsule (crush-ball) containing a liquid flavourant e.g. any of the flavourants listed above. The capsule can be crushed by the user during smoking of the article/consumable to release the flavourant. The capsule may be located at the axial centre of the terminal filter element.

In some embodiments, the article/consumable may comprise an aerosol-cooling element which is adapted to cool the aerosol generated from the aerosol-forming substrate (by heat exchange) before being inhaled by the user.

The aerosol-cooling element will be downstream from the aerosol-forming substrate. For example, it may be between the aerosol-forming substrate and the upstream or terminal filter element and/or between the upstream and terminal filter elements. The aerosol cooling element may be at least partly (e.g. completely) circumscribed by the (paper) wrapping layer.

The aerosol-cooling element may be formed of a plastics material selected from the group consisting of polylactic acid (PLA), polyvinyl chloride (PVC), polyethylene (PE) and polyethylene terephthalate (PET). The aerosol-cooling element may be formed of a crimped/gathered sheet of material to form a structure having a high surface area with a plurality of longitudinal channels to maximise heat exchange and cooling of the aerosol.

The article/consumable may comprise a spacer element that defines a space or cavity or chamber between the aerosol-forming substrate and the downstream end of the article/consumable. The spacer acts to allow both cooling and mixing of the aerosol. It may be provided between the aerosol-forming substrate and the upstream or terminal filter element and/or between the upstream and terminal filter elements. The spacer element may comprise a tubular element e.g. a cardboard tube. The spacer element may be at least partly (e.g. entirely) circumscribed by the (paper) wrapping layer.

The spacer element may have an external diameter of between 5 and 10mm e.g. between 6 and 9mm or 6 and 8mm e.g. around 7 mm. It may have an axial length of between 10 and 15mm e.g. between 12 and 14 mm or 13 and 14mm e.g. around 14mm.

In a third aspect, of the invention there is provided the use of a polar solvent in a filter element of an aerosolforming article for filtering hazardous substances from an aerosol that is drawn through the filter element.

The polar solvent, filter element and the article may all be as described in the second aspect. In a fourth aspect, there is provided a smoking substitute system comprising an aerosol-forming article according to either the first aspect or the second aspect, and a device comprising a heating element.

The device may be a HNB device i.e. a device adapted to heat but not combust the aerosol-forming substrate.

The device may comprise a main body for housing the heating element. The heating element may comprise an elongated e.g. rod, tube-shaped or blade heating element. The heating element may project into or surround a cavity within the main body for receiving the article/consumable described above.

The device (e.g. the main body) may further comprise an electrical power supply e.g. a (rechargeable) battery for powering the heating element. It may further comprise a control unit to control the supply of power to the heating element.

In a fifth aspect of the invention there is provided a use of an additive adsorbent in the terminal downstream end filter of an aerosol forming article.

Optionally, the aerosol forming article has one or more of the optional features described in the first aspect of the invention.

In a sixth aspect, there is provided a method of using a smoking substitute system according to the fourth aspect, the method comprising:

inserting the article/consumable into the device; and

heating the article/consumable using the heating element.

In some embodiments, the method comprises inserting the article/consumable into a cavity within the main body and penetrating the article/consumable with the heating element upon insertion of the article/consumable. For example, the heating element may penetrate the aerosol-forming substrate in the article/consumable.

The skilled person will appreciate that except where mutually exclusive, a feature or parameter described in relation to any one of the above aspects may be applied to any other aspect. Furthermore, except where mutually exclusive, any feature or parameter described herein may be applied to any aspect and/or combined with any other feature or parameter described herein.

Summary of the Figures

So that the invention may be understood, and so that further aspects and features thereof may be appreciated, embodiments illustrating the principles of the invention will now be discussed in further detail with reference to the accompanying figures, in which: Figure 1 shows a first embodiment of an HNB consumable;

Figure 2 shows a second embodiment of an HNB consumable Figure 3 shows a third embodiment of an HNB consumable;

Figure 4 shows a fourth embodiment of an HNB consumable within a device forming an HNB system; Figure 5 shows a fifth embodiment of an HNB consumable;

Figure 6 shows a sixth embodiment of an HNB consumable

Figure 7 shows a seventh embodiment of an HNB consumable; and

Figure 8 shows the fifth embodiment within a device forming an HNB system.

Detailed Description of the Figures

As shown in Figure 1 , the HNB consumable 1 comprises an aerosol-forming substrate 2 at the upstream end of the consumable 1.

The aerosol-forming substrate comprises reconstituted tobacco which includes nicotine as a volatile compound.

The aerosol-forming substrate 2 comprises 65 wt% tobacco which is provided in the form of gathered shreds produced from a sheet of slurry/paper recon tobacco. The tobacco is dosed with 20wt% of a humectant such as propylene glycol (PG) or vegetable glycerine (VG) and has a moisture content of between 7-9 wt%. The aerosol-forming substrate further comprises cellulose pulp filler and guar gum binder.

The aerosol-forming substrate 2 is formed in a substantially cylindrical shape such that the consumable resembles a conventional cigarette. It has diameter of around 7mm and an axial length of around 12 mm.

The aerosol-forming substrate 2 is circumscribed by a paper wrapping layer 3.

The consumable 1 comprises an upstream filter element 4 and a downstream (terminal) filter element 5. The two filter elements 4, 5 are spaced by a cardboard spacer tube 6. Both filter elements 4, 5 are formed of cellulose acetate tow and wrapped with a respective paper plug layer (not shown). Terminal filter element 5 comprises an upstream filter portion 5a and a downstream filter portion 5b that sandwiches adsorbent additive 14.

All filter elements/portions have a substantially cylindrical shape. The diameter of the upstream filter 4 matches the diameter of the aerosol-forming substrate 2. The diameter of the terminal filter element 5/terminal filter portions 5a, 5b is slightly larger and matches the combined diameter of the aerosol-forming substrate 2 and the wrapping layer 3. The upstream filter element 4 is slightly shorter in axial length than the terminal filter element 5 at an axial length of 10mm compared to 12mm for the terminal filter element 5.

The cardboard tube spacer is longer than each of the two filter elements 4, 5 having an axial length of around 14mm.

Upstream filter element 4, upstream filter portion 5a and downstream filter portion 5b (forming the terminal filter element 5) are each a hollow bore filter element with a hollow, longitudinally extending bore. The diameter of the bore in the upstream filter element 4 is slightly larger than the diameter of the bore in the terminal filter element 5 having a diameter of 3mm compared to 2 mm for the terminal filter element 5.

The cardboard spacer tube 6 and the upstream filter element 4 are circumscribed by the wrapping layer 3.

The terminal filter element 5 is joined to the upstream elements forming the consumable by a circumscribing paper tipping layer 7. The tipping layer 7 encircles the terminal filter portion and has an axial length of around 20mm such that it overlays a portion of the cardboard tube spacer 6.

Figure 2 shows a second embodiment of a consumable 1 which is the same as that shown in Figure 1 except that filter element 5 is impregnated with additive adsorbent 14 throughout its entirety. Furthermore, the terminal filter element 5 is a solid filter element and comprises a crushable capsule 8 (crush-ball) having a shell wall containing a liquid menthol or cherry or vanilla flavourant. The capsule 8 is spherical and has a diameter of 3.5mm. It is positioned within the axial centre of the terminal filter portion 5.

Figure 3 shows a third embodiment of a consumable 1 which is the same as the first embodiment except that filter element 5 is impregnated with additive adsorbent 14 in an axially central portion that accounts for just under a third of the volume of filter element 5. Furthermore, the wrapping layer 3 does not completely circumscribe the cardboard spacer tube 6 such that there is an annular gap 9 between the tipping layer 7 and the cardboard spacer tube 6 downstream of the end of the wrapping layer 3.

Figure 4 shows a fourth embodiment 1 inserted into an HNB device 10 comprising a rod-shaped heating element 20. The fourth embodiment is the same as the first embodiment except that the additive adsorbent 14 is in the form of pellets that are evenly distributed within the terminal filter element 5. The heating element projects into a cavity 1 1 within the main body 12 of the device. The consumable 1 is inserted into the cavity 1 1 of the main body 12 of the device 10 such that the heating rod 20 penetrates the aerosol-forming substrate 2. Heating of the reconstituted tobacco in the aerosolforming substrate 2 is effected by powering the heating element (e.g. with a rechargeable battery (not shown)). As the tobacco is heated, moisture and volatile compound (e.g. nicotine) within the tobacco and the humectant are released as a vapour and entrained within an airflow generated by inhalation by the user at the terminal filter portion 5.

As the vapour cools within the upstream filter element 4 and the cardboard spacer tube 6, it condenses to form an aerosol containing the volatile compounds for inhalation by the user. The absorbent additive 14 within the terminal filter element 5 removes hazardous substances from the aerosol as it passes through the terminal filter element 5. In particular, the adsorbent additive 14 removes tobacco-specific nitrosamines (TSNAs) from the aerosol.

Turning now to consider figure 5, a fifth embodiment of a HNB consumable 1 comprises an aerosol-forming substrate 2 at the upstream end of the consumable 1.

The aerosol-forming substrate 2 comprises 65 wt% tobacco which is provided in the form of gathered shreds produced from a sheet of slurry/paper recon tobacco. The tobacco is dosed with 20 wt% of a humectant such as propylene glycol (PG) or vegetable glycerine (VG) and has a moisture content of between 7-9 wt%. The aerosol-forming substrate further comprises cellulose pulp filler and guar gum binder.

The aerosol-forming substrate 2 is circumscribed by a paper wrapping layer 3.

The consumable 1 comprises an upstream filter element 4 and a downstream (terminal) filter element 5. The two filter elements 4, 5 are spaced by a cardboard tube spacer 6. Both filter elements 4, 5 are formed of cellulose acetate tow and wrapped with a respective paper plug layer (not shown).

Both filter elements have a substantially cylindrical shape. The diameter of the upstream filter 4 matches the diameter of the aerosol-forming substrate 2. The diameter of the terminal filter element 5 is slightly larger and matches the combined diameter of the aerosol-forming substrate 2 and the wrapping layer 3. The upstream filter element is slightly shorter in axial length than the terminal filter element at an axial length of 10 mm compared to 12 mm for the terminal filter element. The cardboard tube spacer 6 is longer than each of the two filter portions having an axial length of around 14mnn.

Each filter element 4, 5 is a hollow bore filter element with a hollow, longitudinally extending bore. The diameter of the bore in the upstream filter is slightly larger than the diameter of the bore in the terminal filter having a diameter of 3 mm compared to 2 mm for the terminal filter element.

The terminal filter element 5 is impregnated with water.

The cardboard tube spacer 6 and the upstream filter portion 4 are circumscribed by the wrapping layer 3.

Figure 6 shows a sixth embodiment of a consumable 1 which is the same as that shown in Figure 5 except that the terminal filter element 5 is a solid filter element and comprises a crushable capsule 8 (crush-ball) having a shell wall containing water. The capsule 8 is spherical and has a diameter of 3.5 mm. It is positioned within the axial centre of the terminal filter portion 5.

Figure 7 shows a seventh embodiment of a consumable 1 which is the same as the fifth embodiment except that the upstream filter element 4 is impregnated with water. Furthermore, the wrapping layer 3 does not completely circumscribe the cardboard tube spacer 6 such that there is an annular gap 9 between the tipping layer 7 and the cardboard tube spacer 6 downstream of the end of the wrapping layer 3.

Figure 8 shows the fifth embodiment inserted into an HNB device 10 comprising a rod-shaped heating element 20. The heating element 20 projects into a cavity 1 1 within the main body 12 of the device.

The consumable 1 is inserted into the cavity 1 1 of the main body 12 of the device 10 such that the heating rod 20 penetrates the aerosol-forming substrate 2. Heating of the reconstituted tobacco in the aerosolforming substrate 2 is effected by powering the heating element 20 (e.g. with a rechargeable battery (not shown)). As the tobacco is heated, moisture and volatile compound (e.g. nicotine) within the tobacco and the humectant are released as a vapour and entrained within an airflow generated by inhalation by the user at the terminal filter portion 5.

As the vapour cools within the upstream filter element 4 and the cardboard tube spacer 6, it condenses to form an aerosol containing the volatile compounds for inhalation by the user. The aerosol passes through the terminal filter element 5 where TSNA compounds are absorbed by the water contained within the terminal filter element. The features disclosed in the foregoing description, or in the following claims, or in the accompanying drawings, expressed in their specific forms or in terms of a means for performing the disclosed function, or a method or process for obtaining the disclosed results, as appropriate, may, separately, or in any combination of such features, be utilised for realising the invention in diverse forms thereof.

While the invention has been described in conjunction with the exemplary embodiments described above, many equivalent modifications and variations will be apparent to those skilled in the art when given this disclosure. Accordingly, the exemplary embodiments of the invention set forth above are considered to be illustrative and not limiting. Various changes to the described embodiments may be made without departing from the scope of the invention.

For the avoidance of any doubt, any theoretical explanations provided herein are provided for the purposes of improving the understanding of a reader. The inventors do not wish to be bound by any of these theoretical explanations.

Any section headings used herein are for organizational purposes only and are not to be construed as limiting the subject matter described.

Throughout this specification, including the claims which follow, unless the context requires otherwise, the words“have”,“comprise”, and“include”, and variations such as“having”,“comprises”,“comprising”, and “including” will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

It must be noted that, as used in the specification and the appended claims, the singular forms“a,”“an,” and“the” include plural referents unless the context clearly dictates otherwise. Ranges may be expressed herein as from“about” one particular value, and/or to“about” another particular value. When such a range is expressed, another embodiment includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by the use of the antecedent“about,” it will be understood that the particular value forms another embodiment. The term“about” in relation to a numerical value is optional and means, for example, +/- 10%.

The words "preferred" and "preferably" are used herein refer to embodiments of the invention that may provide certain benefits under some circumstances. It is to be appreciated, however, that other embodiments may also be preferred under the same or different circumstances. The recitation of one or more preferred embodiments therefore does not mean or imply that other embodiments are not useful, and is not intended to exclude other embodiments from the scope of the disclosure, or from the scope of the claims.

Claims

1. An aerosol-forming article comprising an aerosol-forming substrate and a terminal filter element at the downstream axial end of the article wherein the terminal filter element comprises an adsorbent additive.

2. An article according to claim 1 wherein the adsorbent additive is selected from one or more of a zeolite, an activated carbon, a silica gel, a clay, a porous polymer and activated alumina. Preferably, the adsorbent additive is activated carbon.

3. An article according to claim 2 wherein the adsorbent is activated carbon.

4. An article according to any one of the preceding claims wherein the terminal filter element comprises a terminal filter portion and an upstream filter portion and wherein at least a portion of adsorbent additive is sandwiched between the upstream filter portion and the terminal filter portion.

5. An article according to any one of claims 1 to 3 wherein the adsorbent additive is evenly distributed throughout the terminal filter portion.

6. An article according to any one of the preceding claims further comprising an upstream filter element.

7. An article according to claim 6 wherein the terminal filter element and the upstream filter element are axially spaced by an aerosol-cooling element and/or a spacer element.

8. An aerosol-forming article comprising an aerosol-forming substrate and at least one filter element wherein the at least one filter element comprises at least one polar solvent.

9. An aerosol-forming article according to claim 8 wherein the at least one polar solvent is one or more polar solvents selected from water and polar organic solvents.

10. An aerosol-forming article according to claim 9 wherein the polar organic solvent(s) is/are

selected from ethanol, isopropyl alcohol and dimethylsulfoxide.

1 1. An aerosol-forming article according to any one of claims 8 to 10 wherein the at least one polar solvent is evenly distributed throughout the filter element.

12. An aerosol-forming article according to any one of claims 8 to 10 wherein the at least one polar solvent is concentrated in discrete regions within the filter element.

13. An aerosol-forming article according to claim 12 wherein the polar solvent is contained in one or more frangible capsules.

14. An aerosol-forming article according to claim 13 wherein the or each capsule is a crushable

capsule configured to break and release the polar solvent when crushed.

15. An aerosol-forming article according to claim 13 wherein the or each capsule is a thermally labile capsule configured to melt/deform and release the polar solvent when heated.

16. An aerosol-forming article according to any one of claims 8 to 15 wherein the filter element is a terminal filter element.

17. Use of a polar solvent in a filter element of an aerosol-forming article to filter hazardous

substances from an aerosol that is drawn through the filter element.

18. Use of a polar solvent according to claim 17, wherein the aerosol forming article is according to any one of claims 8 to 16.

19. An article according to any one of the preceding claims wherein the article is a heat not burn (HNB) consumable.

20. A system comprising an article according to any one of the preceding claims and a device comprising a heating element.

21. A system according to claim 20 wherein the device comprises a main body for housing the heating element and the heating element comprises an elongated heating element.

22. A method of using the system according to claim 20 or 21 , the method comprising:

inserting the article into the device; and

heating the article using the heating element.

23. A method according to claim 22 comprising inserting the article into a cavity within a main body of the device main body and penetrating the article with the heating element upon insertion of the article.