Smoking substitute consumable

Abstract

The present disclosure relates to an aerosol-forming article comprising an aerosol-forming substrate.SOLUTION: In aerosol-forming articles 1 comprising an aerosol-forming substrate 2, the aerosol-forming article further comprises an upstream filter element 4 and a terminal filter element 5 located at the axially downstream end of the aerosol-forming article. The terminal filter element, and optionally the upstream filter element, is a hollow filter.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to consumables for use in smoking substitution systems, and particularly, but not exclusively, to heat-not-burn (HNB) consumables. [Background technology]

[0002] Tobacco smoking is generally regarded as exposing smokers to potentially harmful substances, which are generally believed to be produced in significant amounts through the burning of tobacco and / or the heat caused by tobacco combustion, as well as through the burned tobacco components in the tobacco smoke itself.

[0003] Conventional combustible smoking articles, such as cigarettes, typically include a cylindrical tobacco rod containing strips of tobacco surrounded by a wrapper, and typically also include a cylindrical filter axially aligned in abutting relationship with the wrapped tobacco rod. The filter typically includes a filtration material circumscribed by a plug wrap. The wrapped tobacco rod and filter are held together by a rolled strip of tipping paper circumscribing the entire length of the filter and adjacent portions of the wrapped tobacco rod. This type of conventional cigarette is used by lighting the end opposite the filter to burn the tobacco rod. The smoker receives mainstream smoke through their mouth by drawing on the mouth or filter end of the cigarette.

[0004] The combustion of organic materials such as tobacco is known to produce tar and other potentially harmful by-products. To avoid smoking tobacco, various smoking substitution systems (or "substitute smoking systems") have been proposed.

[0005] Such smoking substitution systems can form part of a nicotine replacement therapy for people wishing to quit smoking and overcome their dependence on nicotine.

[0006] Smoking substitution systems include electronic systems that allow a user to simulate the act of smoking by producing an aerosol (also called a "vapor") that is drawn into the lungs (inhaled) through the mouth and then exhaled. The inhaled aerosol typically contains nicotine and / or flavorings without or with fewer of the odors and health risks associated with traditional smoking.

[0007] Generally, smoking substitution systems are intended to provide a substitute for the habit of smoking while providing users with an experience and satisfaction similar to that experienced with traditional smoking and combustible tobacco products. Some smoking substitution systems use smoking substitution articles, which are designed to resemble traditional cigarettes and are cylindrical in shape with a mouthpiece at one end.

[0008] The popularity and use of smoke-substitution systems have grown rapidly over the past few years. Although originally marketed as aids to assist chronic smokers wishing to quit smoking cigarettes, consumers increasingly view smoke-substitution systems as a desirable lifestyle accessory.

[0009] There are several different categories of smoking proxy systems, each of which utilizes a different smoking proxy approach.

[0010] One approach for smoking substitution systems is the so-called "heat-not-burn" ("HNB") approach, in which tobacco (not "e-liquid") is heated or warmed to release vapor. The tobacco may be leaf tobacco or reconstituted tobacco. The vapor may contain nicotine and / or flavorings. In the HNB approach, the intention is that the tobacco is heated without being burned, i.e., the tobacco does not undergo combustion.

[0011] A typical HNB smoking substitution system may include a device and a consumable. The consumable may include tobacco material. The device and consumable may be configured to be physically coupled together. In use, heat may be applied to the tobacco material by a heating element of the device, and airflow through the tobacco material causes moisture in the tobacco material to be released as vapor. The vapor may also be formed from a carrier in the tobacco material (which may include, for example, propylene glycol and / or vegetable glycerin), as well as volatile compounds released from the tobacco. The released vapor may be entrained in the airflow drawn through the tobacco.

[0012] As the vapor passes through the consumable (entrained in the airflow) from the inlet to the mouthpiece (outlet), it cools and condenses to form an aerosol for inhalation by the user. The aerosol typically contains volatile compounds.

[0013] In HNB smoking substitution systems, heating, as opposed to burning, tobacco material is believed to result in fewer or lower amounts of the more harmful compounds typically produced during smoking. As a result, the HNB approach can reduce odor and / or health risks that can arise through tobacco burning, tobacco combustion, and pyrolytic degradation.

[0014] Improved designs of HNB consumables are needed to enhance the user experience and improve the functionality of HNB smoking substitution systems. Summary of the Invention [Problem to be solved by the invention]

[0015] The present disclosure has been devised in view of the above problems. [Means for solving the problem]

[0016] Most generally, the present disclosure relates to aerosol-forming articles, such as smoking substitute articles such as HNB consumables, having a hollow filter at their downstream axial ends.

[0017] According to a 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, the article further comprising a terminal filter element located at an axially downstream end of the article, the terminal filter element being a hollow filter element, and one or more of an upstream filter element, an upstream aerosol cooling element, and an upstream spacer element.

[0018] The terminal filter element allows the aerosol to be delivered (through the hollow holes) to the user's mouth while remaining rich in volatile compounds and visible vapor. The terminal hollow filter also reduces resistance to draw (RTD), providing a more comfortable smoking experience for the user. Additionally, the terminal hollow filter acts as an airflow restrictor, contributing to the vapor mixing effect by increasing the local airflow velocity within the holes.

[0019] If present, the upstream filter element (i.e., located upstream of the terminal filter element but downstream of the aerosol-forming substrate) acts to filter particulate matter from the vapor / aerosol generated during heating of the aerosol-forming substrate. If present, the upstream cooling element acts to cool the vapor prior to inhalation by the user, thus increasing user comfort. If present, the spacer element acts to cool and mix the vapor generated from the aerosol-forming substrate.

[0020] Optional features are described below, which may be applied alone or in any combination with any aspect.

[0021] As used herein, the terms "upstream" and "downstream" are intended to refer to the direction of vapor / aerosol flow, i.e., the downstream end of the article / consumable is 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 end opposite the downstream end.

[0022] The inner diameter of the holes in the terminal filter element may be between 1 and 3 mm, for example the inner diameter of the holes may be substantially about 1 mm, or 2 mm, or 3 mm.

[0023] The upstream filter element may also be a hollow filter element, which further increases the concentration of volatile compounds in the aerosol, further reduces the resistance to drawing, and further increases mixing of the vapor.

[0024] The inner diameter of the holes in the upstream filter element may be larger than the inner diameter of the holes in the terminal filter element, for example the inner diameter of the holes may be substantially about 2 mm or 3 mm or 4 mm, ie 2-4 mm.

[0025] In some instances, the upstream filter element has an internal diameter of about 3 mm and the distal filter element has an internal diameter of about 2 mm.

[0026] The upstream and / or terminal filter elements may be constructed of cellulose acetate or polypropylene tow. The upstream and / or terminal filter elements may be constructed of activated carbon. The upstream and / or terminal filter elements may be constructed of paper.

[0027] In some embodiments, the density of the material forming the terminal filter element is increased, e.g., greater than the density of the material forming the upstream filter element, to force airflow through the pores in the terminal filter element. The terminal hollow filter may be formed from a substantially solid / non-porous material.

[0028] The or each filter element may be circumscribed by a plug wrap, for example a paper plug wrap.

[0029] In some embodiments, the upstream filter element and the terminal filter element may be axially spaced apart, for example, the upstream filter element and the terminal filter element may be spaced apart by a cooling element and / or a spacer element.

[0030] The aerosol-cooling element is adapted to cool the aerosol generated (by heat exchange) from the aerosol-forming substrate before it is inhaled by a user. The aerosol-cooling element may be axially adjacent to the terminal filter element. The aerosol-cooling element may be axially adjacent to the upstream filter element.

[0031] The aerosol cooling element may be formed from a plastic 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 from a crimped / collecting sheet of material to form a high surface area structure with multiple longitudinal channels to maximize heat exchange and cooling of the aerosol.

[0032] The spacer element defines a space, cavity, or chamber, such as a space or cavity between two filters. The spacer acts to allow both cooling and mixing of the aerosol. The spacer element may be axially adjacent to the terminal filter element. The spacer element may be axially adjacent to the upstream filter element.

[0033] The spacer element may be a tubular element, for example a paper tube.

[0034] The spacer element may have an outer diameter of 5 to 10 mm, for example 6 to 9 mm or 6 to 8 mm, for example about 7 mm. The spacer element may have an axial length of 10 to 15 mm, for example 12 to 14 mm or 13 to 14 mm, for example about 14 mm.

[0035] The article / consumable includes an aerosol-forming substrate that can be 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.

[0036] To generate the aerosol, the aerosol-forming substrate comprises at least one volatile compound, which is intended to be vaporized / aerosolized and can provide a recreational and / or medicinal effect to the user when inhaled. Suitable chemically and / or physiologically active volatile compounds include nicotine, cocaine, caffeine, opiates and opioids, cathines and cathinones, kavalactones, mysticin, beta-carboline alkaloids, salvinorin A, along with any combinations, functional equivalents, and / or synthetic substitutes of the above.

[0037] The snow leopard snow leopard is Amaranthus dubius Arctostaphylos uva-ursi (Bearberry)、 Mexican Argemone、 Amica、 Artemisia vulgaris、 Yellow Tees、 Galea zacatechichi、 Canavalia maritima (Baybean) Cecropia mexicana (Guamura) Cestrum noctumum Cynoglossum virginianum (wild comfrey) Cytisus scoparius, Damiana, Entada rheedii, Eschscholzia califomica (California Poppy), Fittonia albivenis, Hippobroma longiflora, Humulus japonica (Japanese Hops), Humulus lupulus (Hops), Lactuca virosa (Opium Lettuce) alata、 Leonotis leonurus、 Leonurus cardiaca (Motherwort)、 Leonurus sibiricus (Honeyweed)、 Lobelia cardinalis、 Lobelia inflata (Indian-tobacco)、 Lobelia syphilitica、 Nepeta cataria (Catnip) Nicotiana species (Tobacco) Nymphaea alba (White Lily), Nymphaea caerulea (Blue Lily), Opium poppy, Passiflora incamata (Passionflower), Pedicularis densiflora (Indian Warrior), Pedicularis groenlandica (Elephant ́s Head), Salvia divinorum, Salvia dorrii (Tobacco). Sage)、 Salvia species (Sage)、The composition may include at least one plant material selected from the list including Scutellaria galericulata, Scutellaria lateriflora, Scutellaria nana, Scutellaria species (Skullcap), Sida acuta (Wireweed), Sida rhombifolia, Silene capensis, Syzygium aromaticum (Clove), Tagetes lucida (Mexican Tarragon), Tarchonanthus camphoratus, Tumera diffusa (Damiana), Verbascum (Mullein), Zamia latifolia (Maconha Brava), together with any combination, functional equivalent, and / or synthetic alternative of the above.

[0038] Preferably, the plant material is tobacco. Any type of tobacco may be used, including, but not limited to, iron-cured, burley, Maryland, dark air-cured, Oriental, dark flue-cured, perique, and rustica. This also includes blends of the aforementioned tobaccos.

[0039] Any suitable part of the tobacco plant may be used, including the leaves, stems, roots, bark, seeds, and flowers.

[0040] Tobacco can include one or more of leaf tobacco, stem tobacco, tobacco powder, tobacco dust, tobacco derivatives, expanded tobacco, homogenized tobacco, cut tobacco, extruded tobacco, cut rag tobacco, and / or reconstituted tobacco (e.g., slurry recon or paper recon).

[0041] The aerosol-forming substrate may comprise a collecting sheet of homogeneous (eg paper / slurry recon) tobacco, or a collecting strip / strip formed from such a sheet.

[0042] In some embodiments, the sheet used to form the aerosol-forming substrate has a mass of 100 g / m 2 or more, for example, 120 g / m 2 110g / m or more 2 The sheet has a basis weight of at least 100g.

[0043] The sheet is 300g / m 2 Below, for example, 250 g / m 2 or less, or 200 g / m 2 It can have the following basis weights:

[0044] Sheet weight: 120-190g / m 2 The sheet may have a basis weight of

[0045] The aerosol-forming substrate may comprise at least 50% by weight of plant material, such as at least 60% by weight of plant material, for example about 65% by weight of plant material. The aerosol-forming substrate may comprise no more than 80% by weight of plant material, for example no more than 75 or 70% by weight of plant material.

[0046] The aerosol-forming substrate may include one or more additives selected from humectants, flavoring agents, fillers, aqueous / non-aqueous solvents, and binders.

[0047] The humectant serves as a vapor generator, and the resulting vapor helps retain the volatile active compound and increases the visible vapor. Suitable humectants include polyhydric alcohols (e.g., propylene glycol (PG), triethylene glycol, 1,2-butanediol, and vegetable glycerin (VG)) and their esters (e.g., glycerol monoacetate, diacetate, or triacetate). The humectant may be present in the aerosol-forming substrate in an amount of 1 to 50% by weight.

[0048] 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% by weight, such as at least 5% by weight, such as at least 10% by weight, such as at least 20% by weight, such as at least 30% by weight, or such as at least 40% by weight.

[0049] 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% by weight, such as at most 30% by weight, or such as at most 20% by weight.

[0050] Preferably, the humectant content is from 1 to 40% by weight of the aerosol-forming substrate, such as from 1 to 20% by weight.

[0051] Suitable binders are known in the art and can act to bind together the components forming the aerosol-forming substrate. Binders can include starch and / or cellulose binders such as methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, and methyl cellulose, gums such as xanthan gum, guar gum, gum arabic, and / or locust bean gum, organic acids and their salts such as alginic acid / sodium alginate, agar, and pectin.

[0052] Preferably, the binder content is 5-10% by weight of the aerosol-forming substrate, for example about 6-8% by weight.

[0053] Suitable fillers are known in the art and can act to enhance the aerosol-forming substrate. Fillers can include fibrous (non-tobacco) fillers such as cellulose fibers, lignocellulosic fibers (e.g., wood fibers), jute fibers, and combinations thereof.

[0054] Preferably, the filler content is 5-10% by weight of the aerosol-forming substrate, for example about 6-9% by weight.

[0055] The aerosol-forming substrate may comprise an aqueous and / or non-aqueous solvent, hi some embodiments, the aerosol-forming substrate has a water content of 5 to 10% by weight, for example 6 to 9% by weight, such as 7 to 9% by weight.

[0056] The flavoring agents may be provided in solid or liquid form. Flavoring agents may include menthol, licorice, chocolate, fruit flavors (including, for example, citrus, cherry, etc.), vanilla, spices (e.g., ginger, cinnamon), and tobacco flavors. The flavoring agents may be uniformly dispersed throughout the aerosol-forming substrate or may be provided at discrete locations and / or varying concentrations throughout the aerosol-forming substrate.

[0057] The aerosol-forming substrate may be circumscribed by a wrap layer, for example a paper wrap layer, which may overlie an inner foil layer or may comprise a paper / foil laminate (foil innermost).

[0058] The aerosol-forming substrate may be formed in a substantially cylindrical shape so that the article / consumable resembles a conventional cigarette. The aerosol-forming substrate may have a diameter of 5 to 10 mm, for example 6 to 9 mm or 6 to 8 mm, for example about 7 mm. The aerosol-forming substrate may have an axial length of 10 to 15 mm, for example 11 to 14 mm, such as about 12 or 13 mm.

[0059] The upstream and / or terminal filter element may have a substantially cylindrical shape, the diameter of which substantially corresponds to the diameter of the aerosol-forming substrate (with or without its associated wrap layer). The axial length of the or each filter element may be less than 20 mm, such as 8 to 15 mm, for example 9 to 13 mm, for example 10 to 12 mm.

[0060] The upstream filter element may be at least partially (e.g., entirely) circumscribed by the (paper) wrap layer. The aerosol cooling element may be at least partially (e.g., entirely) circumscribed by the (paper) wrap layer. The spacer element may be at least partially (e.g., entirely) circumscribed by the (paper) wrap layer.

[0061] A circumscribing tipping layer, e.g., a tipping paper layer, can connect the terminal filter element (the downstream end of the article / consumable) to an upstream element to form the article / consumable (e.g., to a cooling element or spacer). The tipping paper can have an axial length greater than the axial length of the terminal filter element, such that the tipping paper completely circumscribes the terminal filter element and the wrap layer surrounding any adjacent upstream elements (e.g., cooling elements or spacers).

[0062] In a second aspect, there is provided a smoking substitution system comprising an aerosol-forming article according to the first aspect and a device comprising a heating element.

[0063] The device may be an HNB device, ie a device adapted to heat an aerosol-forming substrate without combustion.

[0064] The device may include a body for housing a heating element. The heating element may include an elongated, e.g., rod, tubular, or blade heating element. The heating element may project into or surround a cavity in the body for receiving the above-mentioned articles / consumables.

[0065] The device (e.g., main body) may further include a power source, e.g., a (rechargeable) battery, for supplying power to the heating element. The device may further include a control unit for controlling the supply of power to the heating element.

[0066] In a third aspect, there is provided a method of using a smoking substitution system according to the second aspect, the method comprising: Inserting the item / consumable into the device; Heating items / consumables using heating elements Includes:

[0067] In some embodiments, the method includes inserting the article / consumable into a cavity in the body and penetrating a heating element into the article / consumable as the article / consumable is inserted. For example, the heating element can penetrate an aerosol-forming substrate within the article / consumable.

[0068] Those skilled in the art will recognize that, except where mutually exclusive, a feature or parameter described in connection with any one of the above embodiments may also apply to any other embodiment. Furthermore, except where mutually exclusive, any feature or parameter described herein may apply to any embodiment and / or may be combined with any other feature or parameter described herein.

[0069] So that the present invention may be understood, and so that further aspects and features thereof may be realized, embodiments illustrating the principles of the invention will now be described in more detail, with reference to the accompanying drawings. [Brief explanation of the drawings]

[0070] [Figure 1] FIG. 1 illustrates a first embodiment of an HNB consumable. [Figure 2] FIG. 1 illustrates a second embodiment of an HNB consumable. [Figure 3] 1 shows a first embodiment of a device forming an HNB system. DETAILED DESCRIPTION OF THE INVENTION

[0071] As shown in FIG. 1, the HNB consumable 1 includes an aerosol-forming substrate 2 at the upstream end of the consumable 1 .

[0072] The aerosol-forming substrate comprises reconstituted tobacco, the reconstituted tobacco comprising nicotine as a volatile compound.

[0073] The aerosol-forming substrate 2 comprises 65% by weight tobacco provided in the form of collected shreds produced from a sheet of slurry / paper-reconstituted tobacco. The tobacco is coated with 20% by weight of a humectant, such as propylene glycol (PG) or vegetable glycerin (VG), and has a moisture content of 7-9% by weight. The aerosol-forming substrate further comprises a cellulose pulp filler and a guar gum binder.

[0074] The aerosol-forming substrate 2 is formed in a substantially cylindrical shape so that the consumable resembles a conventional cigarette. The aerosol-forming substrate 2 has a diameter of about 7 mm and an axial length of about 12 mm.

[0075] The aerosol-forming substrate 2 is circumscribed by a paper wrap layer 3 .

[0076] The consumable 1 includes an upstream filter element 4 and a downstream (terminal) filter element 5. The two filter elements 4, 5 are spaced apart by a paper tube spacer 6. Both filter elements 4, 5 are formed from cellulose acetate tow and are wrapped with respective paper plug layers (not shown). The cellulose acetate tow density is greater in the terminal filter element 5.

[0077] 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, matching the combined diameter of the aerosol-forming substrate 2 and the wrap layer 3. The upstream filter element is slightly shorter in axial length than the terminal filter element, having an axial length of 10 mm compared to 12 mm for the terminal filter element.

[0078] The paper tube spacer is longer than each of the two filter portions and has an axial length of about 14 mm.

[0079] Each filter element 4, 5 is a hollow filter element having a longitudinally extending hollow 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.

[0080] The paper tube spacer 6 and the upstream filter portion 4 are circumscribed by the wrap layer 3 .

[0081] The terminal filter element 5 is joined to the upstream element to form the consumable by a circumscribing paper tipping layer 7. The tipping layer 7 surrounds the terminal filter portion and has an axial length of about 20 mm, thus overlapping a portion of the paper tube spacer 6.

[0082] Figure 2 shows a second embodiment of consumable 1', which is the same as the first embodiment except that the wrap layer 3 does not completely circumscribe the paper tube spacer 6, and therefore there is an annular gap 9 between the tip layer 7 and the paper tube spacer 6 downstream of the end of the wrap layer 3.

[0083] Figure 3 shows a first embodiment inserted into an HNB device 10 that includes a rod-shaped heating element (not shown). The heating element protrudes into a cavity 11 within the body 12 of the device.

[0084] The consumable 1 is inserted into a cavity 11 in the body 12 of the device 10 so that the heating rod penetrates the aerosol-forming substrate 2. Heating of the reconstituted tobacco in the aerosol-forming substrate 2 is achieved by supplying power to the heating element (e.g., by a rechargeable battery (not shown)). As the tobacco is heated, moisture and volatile compounds (e.g., nicotine) in the tobacco and humectant are released as vapor and are entrained in the airflow generated by inhalation by the user at the terminal filter portion 5.

[0085] As the vapor cools within the upstream filter element 4 and paper tube spacer 6, it condenses to form an aerosol containing volatile compounds for inhalation by the user.

[0086] The features disclosed in the above description, or the following claims, or the accompanying drawings, are appropriately expressed in their specific form, or in terms of means for performing a disclosed function, or a method or process for obtaining a disclosed result, and may be utilized separately or in any combination of such features to realize the invention in its many and varied forms.

[0087] While the present invention has been described in conjunction with the exemplary embodiments set forth above, many equivalent modifications and variations will be apparent to those skilled in the art given this disclosure. Accordingly, the exemplary embodiments of the invention set forth above are considered to be illustrative rather than restrictive. Various changes may be made to the described embodiments without departing from the scope of the invention.

[0088] For the avoidance of any doubt, any theoretical explanations provided herein are provided for the purpose of improving the understanding of the reader, and the inventors do not wish to be bound by any of these theoretical explanations.

[0089] All headings used herein are for organizational purposes only and are not to be construed as limiting the subject matter described.

[0090] Throughout this specification, including the claims which follow, unless the context requires otherwise, the words "have," "comprise," and "include," as well as 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.

[0091] It should be noted that as used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. As used herein, ranges may be expressed 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, by use of the prefix "about," when values ​​are expressed as approximations, it will be understood that the particular value forms another embodiment. The term "about" in connection with numerical values ​​is optional and means, for example, ±10%.

[0092] The words "preferred" and "preferably" are used herein to refer to embodiments of the invention that may provide certain benefits, under some circumstances. It is understood, however, that other embodiments may also be preferred, under the same or different circumstances. Thus, reference to one or more preferred embodiments does not mean or imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the present disclosure or the claims.

[0093] [Appendix 1] An aerosol-forming article comprising an aerosol-forming substrate, the aerosol-forming article further comprising a terminal filter element located at an axially downstream end of the aerosol-forming article, the terminal filter element being a hollow filter element, and one or more of an upstream filter element, an upstream aerosol cooling element, and an upstream spacer element. [Appendix 2] 2. The aerosol-forming article according to claim 1, wherein the inner diameter of the holes in the terminal filter element is 1 to 3 mm. [Appendix 3] 3. The aerosol-forming article according to claim 1 or 2, comprising the upstream filter element, wherein the upstream filter element is a hollow filter element. [Appendix 4] 4. The aerosol-forming article of claim 3, wherein the inner diameter of the holes in the upstream filter element is larger than the inner diameter of the holes in the terminal filter element. [Appendix 5] 5. The aerosol-forming article according to claim 3 or 4, wherein the density of the filter material forming the terminal filter element is greater than the density of the filter material forming the upstream filter element. [Appendix 6] 6. The aerosol-forming article of any one of clauses 3 to 5, wherein the upstream filter element and the terminal filter element are axially spaced apart. [Appendix 7] 7. The aerosol-forming article of claim 6, further comprising an aerosol cooling element, wherein the upstream filter element and the terminal filter element are spaced apart by the aerosol cooling element. [Appendix 8] 7. The aerosol-forming article of claim 6, further comprising the spacer element, wherein the upstream filter element and the terminal filter element are spaced apart by the spacer element. [Appendix 9] 9. The aerosol-forming article of any one of claims 1 to 8, wherein the spacer element is a paper tube. [Appendix 10] 10. The aerosol-forming article of any one of clauses 1 to 9, wherein the aerosol-cooling element comprises a crimping / collecting sheet of plastic material. [Appendix 11] 11. A system comprising an aerosol formation according to any one of claims 1 to 10 and a device comprising a heating element. [Appendix 12] 12. The system of claim 11, wherein the device includes a body for accommodating the heating element, and the heating element includes an elongated heating element. [Appendix 13] 13. A method of using a system according to claim 11 or 12, comprising the steps of: inserting the aerosol-forming article into the device; heating the aerosol-forming article using the heating element; and A method comprising: [Appendix 14] 14. The method of claim 13, comprising inserting the aerosol-forming article into a cavity in a body of the device and penetrating the heating element into the aerosol-forming article when inserting the aerosol-forming article.

Claims

1. 1. A non-combustion heated aerosol-forming article comprising an aerosol-forming substrate, a terminal filter element located at the axial downstream end of the non-combustion heated aerosol-forming article, the terminal filter element being a hollow filter element; an upstream filter element; a spacer element defining a cavity that allows for cooling and mixing of the aerosol; further comprising the density of the filter material forming the terminal filter element is greater than the density of the filter material forming the upstream filter element; the spacer element is axially adjacent to the upstream filter element; Non-combustion heated aerosol-forming article.

2. 2. The non-combustion heating aerosol-forming article according to claim 1, wherein the inner diameter of the holes in the terminal filter element is 1 to 3 mm.

3. The non-combustion-heating aerosol-forming article according to claim 1 or 2, wherein the upstream filter element is a hollow filter element.

4. The non-combustion-heated aerosol-forming article according to claim 3 , wherein the inner diameter of the holes in the upstream filter element is larger than the inner diameter of the holes in the terminal filter element.

5. The non-combustion-heated aerosol-forming article according to claim 1 , wherein the upstream filter element and the terminal filter element are axially spaced apart.

6. 6. The non-combustion heated aerosol-forming article of claim 1, further comprising an aerosol cooling element comprising a crimping / collecting sheet of plastic material.

7. The non-combustion-heated aerosol-forming article according to claim 6 when dependent on claim 5, wherein the upstream filter element and the terminal filter element are spaced apart by the aerosol cooling element.

8. The non-combustion heated aerosol-forming article according to claim 5 , wherein the upstream filter element and the terminal filter element are spaced apart by the spacer element.

9. The non-combustion-heated aerosol-forming article according to claim 1 , wherein the spacer element is longer than each of the upstream filter element and the terminal filter element.

10. The non-combustion heating aerosol-forming article according to claim 1 , wherein the spacer element is a paper tube.

11. The non-combustion heated aerosol-forming article according to claim 1 , wherein the upstream filter element is shorter than the terminal filter element.

12. A non-combustion heating system comprising the non-combustion heating aerosol-forming article according to any one of claims 1 to 11 and a non-combustion heating device including a heating element.

13. The non-combustion heating system of claim 12 , wherein the non-combustion heating device includes a body for housing the heating element, the heating element including an elongated heating element.

14. 14. A method of using the non-combustion heating system of claim 12 or 13, comprising: Inserting the non-combustion heated aerosol-forming article into the device; heating the non-combustion heated aerosol-forming article using the heating element; A method comprising:

15. 15. The method of claim 14, comprising inserting the non-combustion heated aerosol-forming article into a cavity in a body of the non-combustion heated device, and penetrating the heating element into the non-combustion heated aerosol-forming article when inserting the non-combustion heated aerosol-forming article.

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