EP4661703A1

EP4661703A1 - Wrapper for an aerosol-generating consumable and methods for manufacturing the same

Info

Publication number: EP4661703A1
Application number: EP24704749.1A
Authority: EP
Inventors: Walid Abi Aoun; Alina CRAINIC; Ben Jenkins; Jordan RICKETT
Original assignee: Nicoventures Trading Ltd
Current assignee: Nicoventures Trading Ltd
Priority date: 2023-02-10
Filing date: 2024-02-09
Publication date: 2025-12-17
Also published as: JP2026504368A; CN121335639A; WO2024165715A1; GB202301947D0

Abstract

The present invention relates to wrappers (1) and articles (110) including such wrappers (1) for use in a non-combustible aerosol provision system. The wrappers (1) have a smooth surface (3) and a rough surface (2). The invention further relates to methods for manufacturing said wrappers (1) and articles (110), as well as uses of the wrappers (1).

Description

Wrapper for an aerosol-generating consumable and methods for manufacturing the same

Field

The present invention relates to wrappers and articles including such wrappers for use in a non-combustible aerosol provision system. The wrappers have a smooth surface and a rough surface. The invention further relates to methods for manufacturing said wrappers and articles, as well as uses of the wrappers.

Background

Smoking articles such as cigarettes, cigars and the like burn tobacco during use to create tobacco smoke. Attempts have been made to provide alternatives to these articles by creating products that release compounds without combusting. Examples of such products are so-called "heat not burn" products or tobacco heating devices or products, which release compounds by heating, but not burning, smokeable material.

Summary

According to a first aspect of the invention there is provided a wrapper for use in an aerosol generating article, the wrapper having a first surface with a Bendtsen roughness of at least about 1200 ml/min, and a second surface with a Bendtsen roughness of no more than about 500 ml/min.

In some embodiments, the wrapper has a weight of from about 20 to about 90 g/m².

In some embodiments, the wrapper has a thickness of from about 50 to about 200 pm.

In some embodiments, the wrapper has a dry tensile strength of at least about 35 N/15mm.

In some embodiments, the wrapper has a water content of no greater than 9%.

In some embodiments, the wrapper has a permeability of about 0 CU (Coresta Units).

In some embodiments, the opacity of the smoother surface of the wrapper is greater than the opacity of the rougher surface of the wrapper. In some embodiments, the brightness of the smoother surface of the wrapper is less than the brightness of the rougher surface of the wrapper.

In some embodiments, the whiteness of the smoother surface of the wrapper is less than the whiteness of the rougher surface of the wrapper.

In some embodiments, the wrapper comprises fibre in an amount of from about 10 to about 60% by weight of the wrapper (on a dry weight basis).

In some embodiments, the wrapper comprises one or more binders.

In some embodiments, the wrapper comprises one or more binders in an amount of from about 1 to about 20% by weight of the wrapper (on a dry weight basis).

In some embodiments, the wrapper comprises a single sheet. In other embodiments, the wrapper comprises two superposed and bonded sheets each having a different surface roughness.

In some embodiments, the wrapper comprises at least one combustion retarding additive.

In some embodiments, the at least one combustion retarding additive is included in an amount of from about 3 to about 70% by weight of the wrapper (on a dry weight basis).

In some embodiments, the combustion retarding additive comprises an alkali metal halide or an alkaline earth metal oxide, or both.

In some embodiments, the combustion retarding additive is incorporated in the wrapper. In other embodiments, the combustion retarding additive is provided in a coating on a surface of the wrapper.

According to a second aspect of the invention there is provided an article for use in a non-combustible aerosol provision system, the article comprising: a rod comprising an aerosol-generating material, and a wrapper according to the first aspect. In some embodiments, the article has a mouth end and a distal end, and wherein the article comprises a combustion retarding additive located at the distal end.

In some embodiments, the article comprises a plug comprising the combustion retarding additive.

In some embodiments, the article comprises a coating comprising the combustion retarding additive.

In some embodiments, the coating is applied to the wrapper.

In some embodiments, the coating is applied to the aerosol-generating material.

In some embodiments, the wrapper includes vents or perforations.

According to a third aspect of the invention there is provided a non-combustible aerosol provision system comprising an article according to the second aspect.

According to a fourth aspect of the invention there is provided a method of manufacturing a wrapper according to the first aspect, comprising: forming a slurry; casting the slurry on a band or belt; drying the slurry; and removing the dried slurry from the band or belt.

According to a fifth aspect of the invention there is provided use of a bandcast sheet material as a wrapper in an article for use in a non-combustible aerosol provision system.

According to a sixth aspect of the invention there is provided use of a wrapper according to the first aspect to reduce the loss of aerosol generating material from an article for use in a non-combustible aerosol provision system.

Brief Description of the Drawings

Embodiments of the invention will now be described, by way of example only, with reference to accompanying drawings, in which:

Figure 1 is a schematic cross-sectional view of a wrapper according to an embodiment of the present invention. Figure 2 is a schematic cross-sectional view of an alternative wrapper according to an embodiment of the present invention.

Figure 3 is a perspective illustration of an aerosol-generating segment of an article for use in a non-combustible aerosol provision device for generating aerosol, the aerosolgenerating segment comprising a wrapper as shown in Figure 1 or 2.

Figure 4 is a perspective illustration of a non-combustible aerosol provision device for generating aerosol from an article comprising an aerosol-generating segment as shown in Figure 3.

Detailed Description

The present invention seeks to provide an improved wrapper for an article or consumable for use in a non-combustible aerosol provision system. According to the invention, the wrapper has one rougher surface and one smoother surface. When used as a wrapper in an article, the wrapper is arranged so that the smoother surface is arranged facing outwards and the rougher surface is arranged facing inwards so that it is in contact with other elements of the article that are wrapped.

The inventors have found that a wrapper with a relatively rough surface and a relatively smooth surface has a number of surprising technical benefits.

The wrappers of the present invention enjoy the advantage that the manufacturing machinery can run at faster speeds when applying the wrapper to an article compared to the speed when using a conventional paper wrapper or a foil wrapper. It is hypothesised that the increased manufacturing machinery speed may be due to decreased slippage as the wrapper is fed through the machinery and the articles are circumscribed with the wrapper. The rough surface is believed to affords greater grip, allowing the wrapper to be pulled along at greater speeds by the machinery.

The wrappers of the present invention also enjoy the advantage that less glue required to hold the wrapper in place around the article. It is normal for the wrapper to be positioned around the article and for the longitudinal seam to be glued, attaching the overlapped wrapper to itself, and attaching the rougher (inner) surface to the smoother (outer) surface. The amount of glue required to hold the wrapper in place will depend upon a number of factors. If the glue dries faster, less is needed to achieve the desired securing of the wrapper. The hypothesis is that the glue dries quicker when applied to the wrappers of the present invention because the wrapper material is hygroscopic, adsorbing the water from the glue, leaving a more concentrated layer of glue on the surface to provide the desired adhesion.

The wrappers of the present invention also enjoy the advantage that, when they circumscribe a rod of aerosol-generating material, the rougher surface that is in contact with the aerosol-generating material forms a larger contact surface and holds the material in position better, reducing the amount of aerosol-generating material that falls out of the end of the rod (so-called "end fall out").

The wrappers of the present invention also enjoy the advantage that the smooth surface which is position so that it is the visible surface of an article provides a superior appearance of the wrapped article. More porous wrappers have been found less attractive to consumers, giving the impression of poorer quality. In contrast, the smooth surface of the wrapper which is visible when the wrapper surrounds an aerosol-generating article gives the article a high quality, expensive appearance. In embodiments where the wrapper is formed by bandcasting, the smooth surface can have a glossy appearance that is visible on the surface of an article formed with such a wrapper.

The roughness of the surfaces of the wrappers disclosed herein may be assessed as Bendtsen roughness. This roughness is measured by clamping a test piece between a flat glass plate and a circular metal head and measuring the rate of airflow in ml/minute between the paper and head. Applicable standard test methods are BS 4420, ISO 8791/2, DIN 53108 and SCAN P21.

In some embodiments, the wrapper has a relatively rough first surface with a Bendtsen roughness of at least about 1200 ml/min. In some embodiments, the rough surface has a Bendtsen roughness of at least about 1250 ml/min, at least about 1300 ml/min, at least about 1350 ml/min, at least about 1400 ml/min. at least about 1450 ml/min, or at least about 1500 ml/min. Alternatively or in addition, the rough surface has a Bendtsen roughness of no more than about 2200 ml/min. For example, the rough surface has a Bendtsen roughness of no more than about 2150 ml/min, no more than about 2100 ml/min. In embodiments that may be preferred, the rough surface has a Bendtsen roughness of from about 1200 to about 2150 ml/min, or from about 1500 to about 1850 ml/min.

In some embodiments, the wrapper has a relatively smooth second surface with a Bendtsen roughness of less than about 500 ml/min. In some embodiments, the smooth surface has a Bendtsen roughness of no more than about 450 ml/min, no more than about 400 ml/min, no more than about 350 ml/min, no more than about 300 ml/min, or no more than about 250 ml/min. Alternatively or in addition, the smooth surface has a Bendtsen roughness of at least about 150 ml/min. For example, the smooth surface has a Bendtsen roughness of at least about 200 ml/min, or at least about 350 ml/min. In embodiments that may be preferred, the smooth surface has a Bendtsen roughness of from about 200 to about 400 ml/min, or from about 300 to about 400 ml/min.

By way of comparison, the surface roughness of conventionally used paper wrappers is generally from about 122 ml/min (smooth) and about 132 ml/min (rough). It is also known to use aluminium foil as a wrapper in consumables and the surface roughness of these foils is generally from about 14 ml/min (smooth) to about 637 ml/min (rough).

The wrapper is a sheet material. In some embodiments, the sheet material is paper or a paper-like material.

In some embodiments, the sheet material is paper formed from a slurry using a bandcasting process. For example, the process for making a bandcast sheet includes the step of preparing a slurry containing an aqueous component and a solid component, comprising fibre and an optional binder. The slurry is, for example, cast onto a movable band or belt and subsequently dried and removed from the band to form a sheet. The surface that is in contact with the band when the slurry is dried will be smooth. The other surface of the bandcast sheet will be rougher.

In some embodiments, the wrapper has a weight of from about 20 to about 90 g/m², also referred to as GSM. In some embodiments, the wrapper has a weight of at least about 20 g/m², at least about 30 g/m², at least about 40 g/m², at least about 50 g/m², at least about 60 g/m², or at least about 70 g/m². Additionally or alternatively, the wrapper has a weight of no more than about 90 g/m², no more than about 85 g/m², or no more than about 80 g/m². In some embodiments, the wrapper has a weight of from about 60 to about 90 g/m², orfrom about 60 to about 80 g/m².

The wrapper may have a grammage or weight of from about 20 g/m² to about 90 g/m², from about 50 g/m²to about 80 g/m², or from about 60 g/m² to about 80 gsm. Higher grammage wrappers tend to provide increased structural integrity to the wrapped article. In some embodiments, the wrapper has a thickness of from about 50 to about 200 pm. In some embodiments, the wrapper has a thickness of at least about 50 pm, at least about 60 pm, at least about 70 pm, at least about 80 pm, at least about 90 pm, or at least about 95pm. Additionally or alternatively, the wrapper has a thickness of no more than about 200 pm, no more than about 190 pm, no more than about 180 pm, no more than about 170 pm, no more than about 160 pm, no more than about 150 pm, no more than about 140 pm, no more than about 130 pm, no more than about 120 pm, no more than about 110 pm, or no more than about 100 pm. In some embodiments, the wrapper has a thickness of from about 50 to about 150 pm, from about 80 to about 120 pm or from about 90 to about 100 pm.

The tensile strength of wrappers disclosed herein was assessed according to the standard test ISO 1924-2, with a constant rate of elongation of 20 mm/min.

In some embodiments, the wrapper has a dry tensile strength (the maximum stress the wrapper will sustain before fracture) of at least about 35 N/15mm. In some embodiments, the wrapper has a dry tensile strength of at least about 38 N/15mm, or at least about 40 N/15mm. In some embodiments, the wrapper has a dry tensile strength of from about 35 to about 50 N/15mm, or from about 37 to about 45 N/15mm.

In some embodiments, the wrappers may exhibit elongation of from about 3% to about 5.5% prior to fracture during dry tensile testing. In some embodiments, the elongation may be from about 4% to about 5%.

In some embodiments, the wrapper has a wet tensile strength of at least 20 N/15mm. In some embodiments, the wrapper has a wet tensile strength of at least about 25 N/15mm, or at least about 30 N/15mm. In some embodiments, the wrapper has a wet tensile strength of from about 30 to about 45 N/15mm, or from about 35 to about 40 N/15mm.

In some embodiments, the wrappers may exhibit elongation of from about 1.5% to about 3.5% prior to fracture during wet tensile testing.

In some embodiments, the wrapper has a water or moisture content of no greater than about 9%, as measured by Karl Fisher analysis. In some embodiments, the moisture content is no more than about 8%, no more than about 7%, or no more than about 6%. Additionally or alternatively, the moisture content is at least about 3%, at least about 3.5%, or at least about 4%. In some embodiments, the wrapper has a moisture content of from about 4 to about 8%, or from about 5 to about 7%.

In some embodiments, the wrapper may be gas impermeable or substantially gas impermeable. For example, the wrapper may have a permeability of zero (0) CU (Coresta Units). This refers to the property of the wrapper material and does not include any perforations, holes or vents that may be formed in the wrapper before, during or after incorporation into an article.

The appearance of the smoother surface and the rougher surface of the wrappers will differ.

In some embodiments, the opacity of the smoother surface of the wrapper is greater than the opacity of the rougher surface of the wrapper.

In some embodiments, the smoother surface of the wrapper has an opacity as measured according to the standard ISO 2471 of at least 90%. In some embodiments, the smoother surface of the wrapper has an opacity of at least about 91%, at least about 92%, at least about 93%, or at least about 94%. In some embodiments, the smoother surface of the wrapper has an opacity of from about 93 to about 95%.

In some embodiments, the rougher surface of the wrapper has an opacity of at least 90%. In some embodiments, the rougher surface of the wrapper has an opacity of at least about 91%, at least about 92%, or at least about 93%. In some embodiments, the rougher surface of the wrapper has an opacity of from about 93 to about 94%.

In some embodiments, the smoother surface of the wrapper has a whiteness of at least 30, as measured according to the standard ISO 11475. In some embodiments, the smoother surface of the wrapper has a whiteness of at least about 31, at least about 32, at least about 33, or at least about 34. In some embodiments, the smoother surface of the wrapper has a whiteness of from about 33 to about 36. In some embodiments, the rougher surface of the wrapper has a whiteness of at least 45. In some embodiments, the rougher surface of the wrapper has a whiteness of at least about 46, at least about 47, at least about 48, or at least about 49, or at least about 50. In some embodiments, the rougher surface of the wrapper has a whiteness of from about 50 to about 52.

In some embodiments, the brightness of the smoother surface of the wrapper is less than the brightness of the rougher surface of the wrapper.

In some embodiments, the smoother surface of the wrapper has a brightness of at least 60, as measured according to the standard ISO 2470-1. In some embodiments, the smoother surface of the wrapper has a brightness of at least about 61, at least about 62, at least about 63, at least about 64, or at least about 65. In some embodiments, the smoother surface of the wrapper has a brightness of from about 65 to about 67.

In some embodiments, the rougher surface of the wrapper has a brightness of at least 60 Brightness units. In some embodiments, the rougher surface of the wrapper has a brightness of at least about 61, at least about 62, at least about 63, at least about 64%, at least about 65, or at least about 66. In some embodiments, the wrapper has a brightness of from about 66 to about 67.

In some embodiments, the paper comprises fibres, such as cellulose fibres. The fibres may be selected from the group consisting of flax fibres, softwood fibres, hardwood fibres and mixtures thereof. In some embodiments, the paper comprises wood pulp.

In some embodiments, the wrapper comprises fibre in an amount of from about 10 to about 60% by weight of the wrapper (on a dry weight basis). In some embodiments, the wrapper comprises fibre in a total amount of at least about 10 wt%, at least about 15 wt%, at least about 20 wt%, at least about 25 wt%, at least about 30 wt%, at least about 35 wt% about, at least about 40 wt%, at least about 45 wt%, at least about 50 wt%, or at least about 55 wt%, by weight of the wrapper (on a dry weight basis). Alternatively or in addition, the wrapper comprises fibre in a total amount of no more than about 60 wt%, no more than about 55 wt%, no more than about 50 wt%, no more than about 45 wt%, no more than about 40 wt%, no more than about 35 wt% about, no more than about 30 wt%, or no more than about 25 wt% by weight of the wrapper (on a dry weight basis). In some embodiments, the wrapper comprises one or more binders. In some embodiments, the binder is selected from one or more of the group consisting of polyvinyl alcohol (PVA), gelatin, gums, acacia gum, starches, polysaccharides, pectins, alginates, chitosan, celluloses, and cellulose derivatives such as carboxymethylcellulose.

In some embodiments, the wrapper comprises one or more binders in an amount of from about 1 to about 20% by weight of the wrapper (on a dry weight basis). In some embodiments, the wrapper comprises binder in a total amount of at least about 1 wt%, at least about 2 wt%, at least about 3 wt%, at least about 4 wt%, at least about 5 wt%, at least about 7 wt% about, at least about 10 wt%, at least about 12 wt%, at least about 15 wt%, or at least about 17 wt%, by weight of the wrapper (on a dry weight basis). Alternatively or in addition, the wrapper comprises binder in a total amount of no more than about 20 wt%, no more than about 18 wt%, no more than about 15 wt%, no more than about 13 wt%, no more than about 10 wt%, no more than about 8 wt% about, no more than about 5 wt%, or no more than about 3 wt% by weight of the wrapper (on a dry weight basis).

In some embodiments, the wrapper comprises a single sheet. This single sheet has a first surface that is relatively rough and a second surface that is relatively smooth.

One option for preparing a sheet with one rough surface and one smooth surface is bandcasting, as discussed above.

Figure 1 is a schematic representation of a cross section of a wrapper 1 as disclosed herein. The wrapper has a rough surface 2 and a smooth surface 3. When the wrapper is formed by bandcasting, the smooth surface 3 is the surface of the sheet that was formed in contact with the band, whilst the rough surface 2 was the upper surface.

In some other embodiments, the wrapper comprises two or more superposed and bonded sheets each having a different surface roughness, as shown in Figure 2. Both of the surfaces of each of these bonded sheets may have the same roughness, but one sheet may have surfaces that are relatively rough whilst the other sheet has surfaces that are relatively smooth. The sheets may be combined and bonded to produce a wrapper with one relatively rough surface and one relatively smooth surface. Figure 2 is a schematic representation of a cross section of an alternative wrapper 1. The wrapper has a rough surface 2 and a smooth surface 3. This wrapper is formed by bonding two separate sheets together, the first sheet 5 providing the smooth surface 3, whilst the second sheet 4 provides the rough surface 2. The first and second sheets may be bonded by an adhesive (not shown).

In some embodiments, the combustion retarding additive is added to or applied to a sheet material which is used to form the wrapper. The combustion retarding additive may be incorporated into the sheet material, for example during the manufacture of the sheet material. Alternatively or additionally, the combustion retarding additive may be applied to the sheet material, for example in the form of a coating comprising the additive, as discussed in greater detail below. The presence of the combustion retarding additive makes it much harder to light an article comprising the wrapper (as one might light a conventional, combustible cigarette) and hinders combustion of the article.

The wrapper comprising a combustion retarding enjoys the advantage that an article comprising the wrapper is capable of withstanding higher temperatures without burning, which in turn can allow for the release of more volatiles. This is desirable for the end user of the non-combustible aerosol provision system. In addition, this invention has the additional advantage that this is safer if the consumer attempts to ignite the article as the invention reduces the combustion of the article.

In addition, this combustion retardant wrapper provides an environmentally friendly alternative to other wrappers known to perform a combustion-retarding role. For example, it is common to use aluminium as a wrapper to retard combustion in aerosol-generating articles. As aluminium is energy-intensive to produce and challenging to recycle after use, the wrapper described herein is a more sustainable alternative. As described herein, the combustion retarding properties may be achieved with additives such as sodium chloride (NaCI), a sustainable and accessible resource. In addition, as discussed above, the wrapper may comprise paper or a paper-like material and these materials may also be sustainably sourced and are biodegradable. The biodegradability of the wrapper is environmentally friendly and an attractive feature to consumers. In some embodiments, the wrapper, including any combustion retarding coating applied to the wrapper, comprises one or more combustion retarding additive in a total amount of at least about 3 wt%, about 3.5 wt%, about 4 wt%, about 4.5 wt%, about 5 wt%, about 5.5 wt% about, about 6 wt%, about 6.5 wt%, about 7 wt%, about 7.5 wt%, about 8 wt%, about 9 wt%, about 10 wt%, about 20 wt%, about 30 wt%, about 40 wt%, about 50 wt%, about 60 wt%, about 70 wt%, and/or in an amount of no more than about 70 wt%, about 65 wt%, about 60 wt%, about 55 wt%, or about 50 wt% of the wrapper (all calculated on a dry weight basis).

For the avoidance of doubt, the reference to the amount of additive in the coating is a reference to the amount of additive added to the wrapper or coating, and does not include any combustion retarding material that may be present in the wrapper or coating without the addition of the combustion retarding salt as described herein.

The combustion-retarding additives used herein may be combustion retarding salts which are chemical compounds consisting of an ionic assembly of cation and anions. The salts used herein are those whose anion and/or whose cation may be effective in retarding combustion. In some embodiments, the salt is an inorganic salt.

In some embodiments, the salt is a halide salt, i.e. has a halide anion. In some embodiments, the salt is a chloride salt or a bromide salt. The presence of high concentrations of chloride or bromide has been shown to retard combustion, as discussed further below.

In some embodiments, the salt may be an alkali metal salt, i.e. has an alkali metal cation. In some embodiments, the salt has an alkaline earth metal cation. In some embodiments, the salt has a zinc cation or an iron cation, such as a ferric or ferrous cation. In some embodiments, the salt has an ammonium cation or a phosphonium cation.

In some embodiments, the salt may be an alkali metal halide, such as sodium chloride or potassium chloride. The salt may be an alkaline earth metal halide, such as magnesium chloride, calcium chloride. The salt may be another metal halide, such as zinc chloride or sodium bromide.

In some embodiments, the salt has a carboxylate anion. For example, the salt may be an alkali metal carboxylate, such as potassium citrate, potassium succinate, potassium malate, potassium acetate, potassium tartrate, potassium oxalate, sodium citrate, sodium succinate, sodium acetate, or sodium malate.

In other embodiments, the salt has an anion selected from: borate, carbonate, phosphate, sulphate or sulphamate.

Factors that may influence the selection of salt will include, for example, melting point, which will preferably be at least 450°C. In some embodiments, the salt is soluble in water. In some embodiments, the salt is selected to provide a desired pH to the material it is added to. In some embodiments, the salt will not significantly change the pH of the material.

In some embodiments, sodium chloride (NaCI) is the salt used. It has been demonstrated that wrapper with a high chloride content is difficult to combust. Further, sodium chloride is neutral, highly soluble and does not affect pH of the wrapper.

The combustion retarding additive may comprise one salt or a combination of any number of salts disclosed herein or known in the art.

In some embodiments, the combustion retarding salt comprises, consists essentially of, or consists of sodium chloride, potassium chloride, sodium bromide and/or potassium bromide.

Depending on the combustion retarding or other physical properties desired, the components of the salt may be in free base form, salt form, or as a complex, or as a solvate.

Other combustion retarding additives that may be used in the present invention include, for example, magnesium oxide. For example, a combination of sodium chloride and magnesium oxide may be included in the wrapper.

In some embodiments, the combustion retarding additive is added to the wrapper in the form of a coating comprising a combustion retarding additive and a binder. In some embodiments, the coating is added to the sheet before it is used to wrap a section of aerosol generating material. In other embodiments, the coating is added to wrapper once in place around the aerosol generating material, for example it is added to the formed article. The binder may be a film-forming material, which forms the basis of the coating comprising the combustion retarding additive. The combustion retarding additive may be located in or on the film formed from the binder. In some embodiments, the salt is mixed with the binder and applied to the wrapper, as discussed in greater detail below.

The binder may adhere the combustion retarding additive to the sheet material or wrapper. It may also be used to adhere the wrapper to itself and/or to other components of the article.

Suitable binders include, for example, film-forming agents such as polyvinyl alcohol (PVA), gelatin, gums such as acacia gum, starches and derivatives thereof, polysaccharides, pectins, alginates, wood pulp, celluloses, cellulose derivatives such as carboxymethylcellulose, silica or silicones compounds, clays, and combinations thereof. Suitable binders include, for example, gelling agents such as one or more of alginates, pectins, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethylcellulose, pullulan, chitosan, xanthan gum guar gum, carrageenan, agarose, acacia gum, fumed silica, PDMS, sodium silicate, kaolin and polyvinyl alcohol. In some cases, the binder may include alginate and/or pectin, and the precursor material may further comprise a setting agent (such as a calcium source) which may aid formation of the amorphous solid. In some cases, the binder may include a calcium-crosslinked alginate and/or a calcium-crosslinked pectin.

In some embodiments, the coating comprises at least about 0.1 wt%, about 0.2 wt%, about 0.3 wt%, about 0.4 wt%, about 0.5 wt%, about 0.6 wt%, about 0.7 wt%, about 0.8 wt%, about 0.9 wt%, about 1 wt%, about 10 wt%, about 20 wt%, about 30 wt%, about 35 wt%, about 40 wt%, about 45 wt% or at least about 50 wt% of a binder (all calculated on a dry weight basis). In some cases, the coating comprises no more than about 70 wt%, about 65 wt%, about 60 wt%, about 55 wt%, about 50 wt%, about 45 wt%, about 40 wt%, about 35 wt%, or about 30 wt % of a binder (all calculated on a dry weight basis).

Articles for use in a non-combustible aerosol provision system

According to a further aspect of the invention there is provided an article for use in a non-combustible aerosol provision system, the article comprising: a rod comprising a segment of aerosol-generating material, the segment of aerosol generating material being at least partially wrapped in a wrapper, wherein the wrapper has one rougher surface and one smoother surface. In some embodiments, the article comprises a wrapper according to the first aspect of the invention described herein.

Preferably, the rough surface of the wrapper is the inner surface when the wrapper circumscribes the aerosol-generating material. This assists with holding the aerosolgenerating material in place within the article and reduces the amount of aerosolgenerating material that falls out of the rod during manufacture, transport, storage or use of the article.

Figure 3 is a side-on cross-sectional schematic view of a portion of a consumable or article for use in an aerosol delivery system. The portion of a consumable or article comprises an aerosol generating segment 10 in the form of a cylindrical rod and comprises an aerosol-generating material 11 comprising, in this example, cut rag reconstituted tobacco. The aerosol-generating material 11 can be any suitable material. The cylindrical section of aerosol-generating material 11 is circumscribed by a wrapper 1, as shown in Figure 1 or Figure 2. The wrapper 1 has a smooth surface 3 which is on the outside of the aerosol generating segment 10. The rough surface 2 of the wrapper 1 faces and is in contact with the aerosol-generating material 11.

One end of the illustrated aerosol generating segment 10 may abut a mouthpiece segment (not shown). This may, for example, comprise a body of material such as a fibrous or filamentary tow, and/or a cooling element. The other end of the aerosol generating segment 10 may be the end of the consumable or article (the so-called distal end of the consumable).

In some embodiments, the wrapper of the article may have a plurality of vents and/or perforations. This increases the ventilation in the article, can enhance the user's experience of the flavour properties of the aerosol generating material and provide the appropriate pressure drop for ease of use. The location of these vents and/or perforations may be from about 0.5 mm to about 10 mm, from about 1 mm to about 4 mm or from about 4 mm to about 8 mm from the distal end of the rod. The vents and/or perforations may be of any suitable size and/or number. The size, number and location on the wrapper of the vents and/or perforations may be selected to provide the appropriate flow through of air. For example, more numerous and larger vents and/or perforations may introduce more air into the rod, increase the flow-through of air and thus provide the appropriate pressure drop. An aerosol-generating material is a material that is capable of generating aerosol, for example when heated, irradiated or energized in any other way. Aerosol-generating material may, for example, be in the form of a solid, liquid or gel which may or may not contain an active substance and/or flavourants. In some embodiments, the aerosol-generating material may comprise an "amorphous solid", which may alternatively be referred to as a "monolithic solid" (i.e. non-fibrous). In some embodiments, the amorphous solid may be a dried gel. The amorphous solid is a solid material that may retain some fluid, such as liquid, within it. In some embodiments, the aerosol-generating material may for example comprise from about 50 wt%, about 60 wt% or about 70 wt% of amorphous solid, to about 90 wt%, 95 wt% or 100 wt% of amorphous solid.

In some embodiments, the article, wrapper, carrier, amorphous solid, aerosolgenerating material or any component of the article may further comprise one or more of aerosol-former material(s), functional material(s), flavour(s), botanical(s), active substance(s) or aerosol-modifying agent.

The one or more other functional materials may comprise one or more of pH regulators, colouring agents, preservatives, binders, fillers, stabilizers, and/or antioxidants.

The aerosol-former material may comprise one or more constituents capable of forming an aerosol. In some embodiments, the aerosol-former material may comprise one or more of glycerine, glycerol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,3-butylene glycol, erythritol, meso-Erythritol, ethyl vanillate, ethyl laurate, a diethyl suberate, triethyl citrate, triacetin, a diacetin mixture, benzyl benzoate, benzyl phenyl acetate, tributyrin, lauryl acetate, lauric acid, myristic acid, and propylene carbonate.

As used herein, the terms "flavour" and "flavourant" refer to materials which, where local regulations permit, may be used to create a desired taste, aroma or other somatosensorial sensation in a product for adult consumers. They may include naturally occurring flavour materials, botanicals, extracts of botanicals, synthetically obtained materials, or combinations thereof (e.g., tobacco, cannabis, licorice (liquorice), hydrangea, eugenol, Japanese white bark magnolia leaf, chamomile, fenugreek, clove, maple, matcha, menthol, Japanese mint, aniseed (anise), cinnamon, turmeric, Indian spices, Asian spices, herb, Wintergreen, cherry, berry, red berry, cranberry, peach, apple, orange, mango, clementine, lemon, lime, tropical fruit, papaya, rhubarb, grape, durian, dragon fruit, cucumber, blueberry, mulberry, citrus fruits, Drambuie, bourbon, scotch, whiskey, gin, tequila, rum, spearmint, peppermint, lavender, aloe vera, cardamom, celery, cascarilla, nutmeg, sandalwood, bergamot, geranium, khat, naswar, betel, shisha, pine, honey essence, rose oil, vanilla, lemon oil, orange oil, orange blossom, cherry blossom, cassia, caraway, cognac, jasmine, ylang-ylang, sage, fennel, wasabi, piment, ginger, coriander, coffee, hemp, a mint oil from any species of the genus Mentha, eucalyptus, star anise, cocoa, lemongrass, rooibos, flax, ginkgo biloba, hazel, hibiscus, laurel, mate, orange skin, rose, tea such as green tea or black tea, thyme, juniper, elderflower, basil, bay leaves, cumin, oregano, paprika, rosemary, saffron, lemon peel, mint, beefsteak plant, curcuma, cilantro, myrtle, cassis, valerian, pimento, mace, damien, marjoram, olive, lemon balm, lemon basil, chive, carvi, verbena, tarragon, limonene, thymol, camphene), flavour enhancers, bitterness receptor site blockers, sensorial receptor site activators or stimulators, sugars and/or sugar substitutes (e.g., sucralose, acesulfame potassium, aspartame, saccharine, cyclamates, lactose, sucrose, glucose, fructose, sorbitol, or mannitol), and other additives such as charcoal, chlorophyll, minerals, botanicals, or breath freshening agents. They may be imitation, synthetic or natural ingredients or blends thereof. They may be in any suitable form, for example, liquid such as an oil, solid such as a powder, or gas.

In some embodiments, the flavour comprises menthol, spearmint and/or peppermint. In some embodiments, the flavour comprises flavour components of cucumber, blueberry, citrus fruits and/or redberry. In some embodiments, the flavour comprises eugenol. In some embodiments, the flavour comprises flavour components extracted from tobacco. In some embodiments, the flavour comprises flavour components extracted from cannabis.

In some embodiments, the flavour may comprise a sensate, which is intended to achieve a somatosensorial sensation which are usually chemically induced and perceived by the stimulation of the fifth cranial nerve (trigeminal nerve), in addition to or in place of aroma or taste nerves, and these may include agents providing heating, cooling, tingling, numbing effect. A suitable heat effect agent may be, but is not limited to, vanillyl ethyl ether and a suitable cooling agent may be, but not limited to eucolyptol, WS-3. In some embodiments, the substance to be delivered comprises a flavour.

The active substance as used herein may be a physiologically active material, which is a material intended to achieve or enhance a physiological response. The active substance may for example be selected from nutraceuticals, nootropics, and psychoactives. The active substance may be naturally occurring or synthetically obtained. The active substance may comprise for example nicotine, caffeine, taurine, theine, vitamins such as B6 or B12 or C, melatonin, cannabinoids, or constituents, derivatives, or combinations thereof. The active substance may comprise one or more constituents, derivatives or extracts of tobacco, cannabis or another botanical. In some embodiments, the substance to be delivered comprises an active substance.

In some embodiments, the active substance comprises nicotine. In some embodiments, the active substance comprises caffeine, melatonin or vitamin B12.

As noted herein, the active substance may comprise one or more constituents, derivatives or extracts of cannabis, such as one or more cannabinoids or terpenes.

As noted herein, the active substance may comprise or be derived from one or more botanicals or constituents, derivatives or extracts thereof. As used herein, the term "botanical" includes any material derived from plants including, but not limited to, extracts, leaves, bark, fibres, stems, roots, seeds, flowers, fruits, pollen, husk, shells or the like. Alternatively, the material may comprise an active compound naturally existing in a botanical, obtained synthetically. The material may be in the form of liquid, gas, solid, powder, dust, crushed particles, granules, pellets, shreds, strips, sheets, or the like. Example botanicals are tobacco, eucalyptus, star anise, hemp, cocoa, cannabis, fennel, lemongrass, peppermint, spearmint, rooibos, chamomile, flax, ginger, ginkgo biloba, hazel, hibiscus, laurel, licorice (liquorice), matcha, mate, orange skin, papaya, rose, sage, tea such as green tea or black tea, thyme, clove, cinnamon, coffee, aniseed (anise), basil, bay leaves, cardamom, coriander, cumin, nutmeg, oregano, paprika, rosemary, saffron, lavender, lemon peel, mint, juniper, elderflower, vanilla, Wintergreen, beefsteak plant, curcuma, turmeric, sandalwood, cilantro, bergamot, orange blossom, myrtle, cassis, valerian, pimento, mace, damien, marjoram, olive, lemon balm, lemon basil, chive, carvi, verbena, tarragon, geranium, mulberry, ginseng, theanine, theacrine, maca, ashwagandha, damiana, guarana, chlorophyll, baobab or any combination thereof. The mint may be chosen from the following mint varieties: Mentha Arventis, Mentha c.v., Mentha niliaca, Mentha piperita, Mentha piperita citrata c.v., Mentha piperita c.v., Mentha spicata crispa, Mentha cardifolia, Mentha longifolia, Mentha suaveolens variegata, Mentha pulegium, Mentha spicata c.v. and Mentha suaveolens

In some embodiments, the active substance comprises or is derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is tobacco.

In some embodiments, the active substance comprises or derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is selected from eucalyptus, star anise, cocoa and hemp.

In some embodiments, the active substance comprises or derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is selected from rooibos and fennel.

An aerosol-modifying agent is a substance, typically located downstream of the aerosol generation area, that is configured to modify the aerosol generated, for example by changing the taste, flavour, acidity or another characteristic of the aerosol. The aerosol-modifying agent may be provided in an aerosol-modifying agent release component that is operable to selectively release the aerosol-modifying agent

The aerosol-modifying agent may, for example, be an additive or a sorbent. The aerosol-modifying agent may, for example, comprise one or more of a flavourant, a colourant, water, and a carbon adsorbent. The aerosol-modifying agent may, for example, be a solid, a liquid, or a gel. The aerosol-modifying agent may be in powder, thread or granule form. The aerosol-modifying agent may be free from filtration material.

In some embodiments, the article comprises a substrate. The material may be present on or in a support, to form a substrate. The support may, for example, be or comprise paper, card, paperboard, cardboard, reconstituted material, a plastics material, a ceramic material, a composite material, glass, a metal, or a metal alloy.

In some embodiments, the support comprises a susceptor. In some embodiments, the susceptor is embedded within the material. In some alternative embodiments, the susceptor is on one or either side of the material. In some embodiments, the article comprises a combustion retarding additive, such as a combustion retarding additive as discussed elsewhere herein.

The article may be said to have a mouth end and a distal end. These designations are based on the intended use of the article, with the mouth end being the end that the user will draw on whilst the distal end will be inserted into the heating device. In some embodiments, the article comprises a combustion retarding additive located at the distal end.

For example, in some embodiments, the article comprises a plug comprising the combustion retarding additive. This plug may be located at the distal end of the article.

In some embodiments, the article comprises a coating comprising the combustion retarding additive. Optionally, this coating may be applied to the wrapper. It may be applied to the outer or the inner surface of the wrapper (when the wrapper forms part of the article).

Alternatively or additionally, the combustion retarding additive may be applied to the aerosol-generating material, for example in the form of a coating.

As used herein, non-combustible aerosol provision systems are delivery systems that release compounds from an aerosol-generating material without combusting the aerosol-generating material, such as electronic cigarettes, tobacco heating products, and hybrid systems to generate aerosol using a combination of aerosol-generating materials.

In some embodiments, the non-combustible aerosol provision system is a powered non-combustible aerosol provision system.

According to the present disclosure, a "non-combustible" aerosol provision system is one where a constituent aerosol-generating material of the aerosol provision system (or component thereof) is not combusted or burned in order to facilitate delivery of at least one substance to a user.

In some embodiments, the non-combustible aerosol provision system is an electronic cigarette, also known as a vaping device or electronic nicotine delivery system (END), although it is noted that the presence of nicotine in the aerosol-generating material is not a requirement.

In some embodiments, the non-combustible aerosol provision system is an aerosolgenerating material heating system, also known as a heat-not-burn system. An example of such a system is a tobacco heating system.

In some embodiments, the non-combustible aerosol provision system is a hybrid system to generate aerosol using a combination of aerosol-generating materials, one or a plurality of which may be heated. Each of the aerosol-generating materials may be, for example, in the form of a solid, liquid or gel and may or may not contain nicotine. In some embodiments, the hybrid system comprises a liquid or gel aerosolgenerating material and a solid aerosol-generating material. The solid aerosolgenerating material may comprise, for example, tobacco or a non-tobacco product.

Typically, the non-combustible aerosol provision system may comprise a non- combustible aerosol provision device and a consumable for use with the non- combustible aerosol provision device. These consumables are also referred to as articles throughout the disclosure.

In some embodiments, the non-combustible aerosol provision system, such as a non- combustible aerosol provision device thereof, may comprise a power source and a controller. The power source may, for example, be an electric power source or an exothermic power source. In some embodiments, the exothermic power source comprises a carbon substrate which may be energised so as to distribute power in the form of heat to an aerosol-generating material or to a heat transfer material in proximity to the exothermic power source.

In some embodiments, the non-combustible aerosol provision system may comprise an area for receiving the consumable, an aerosol generator, an aerosol generation area, a housing, a mouthpiece, a filter and/or an aerosol-modifying agent.

In some embodiments, the consumable for use with the non-combustible aerosol provision device may comprise aerosol-generating material, an aerosol-generating material storage area, an aerosol-generating material transfer component, an aerosol generator, an aerosol generation area, a housing, a wrapper, a filter, a mouthpiece, and/or an aerosol-modifying agent. In some embodiments, the non-combustible aerosol provision system comprises a consumable. A consumable is an article comprising or consisting of aerosolgenerating material, part or all of which is intended to be consumed during use by a user. A consumable may comprise one or more other components, such as an aerosol-generating material storage area, an aerosol-generating material transfer component, an aerosol generation area, a housing, a wrapper, a mouthpiece, a filter and/or an aerosol-modifying agent. A consumable may also comprise an aerosol generator, such as a heater, that emits heat to cause the aerosol-generating material to generate aerosol in use. The heater may, for example, comprise combustible material, a material heatable by electrical conduction, or a susceptor.

In some embodiments, the non-combustible aerosol provision system comprises a susceptor. A susceptor is a material that is heatable by penetration with a varying magnetic field, such as an alternating magnetic field. The susceptor may be an electrically-conductive material, so that penetration thereof with a varying magnetic field causes induction heating of the heating material. The heating material may be magnetic material, so that penetration thereof with a varying magnetic field causes magnetic hysteresis heating of the heating material. The susceptor may be both electrically-conductive and magnetic, so that the susceptor is heatable by both heating mechanisms. The device that is configured to generate the varying magnetic field is referred to as a magnetic field generator, herein.

In some embodiments, the non-combustible aerosol provision system comprises an aerosol generator. An aerosol generator is an apparatus configured to cause aerosol to be generated from the aerosol-generating material. In some embodiments, the aerosol generator is a heater configured to subject the aerosol-generating material to heat energy, so as to release one or more volatiles from the aerosol-generating material to form an aerosol. In some embodiments, the aerosol generator is configured to cause an aerosol to be generated from the aerosol-generating material without heating. For example, the aerosol generator may be configured to subject the aerosol-generating material to one or more of vibration, increased pressure, or electrostatic energy.

Figure 4 shows an example of a non-combustible aerosol provision device 100 for generating aerosol from an aerosol-generating medium/material such as the aerosolgenerating material of a consumable 110, as described herein. In broad outline, the device 100 may be used to heat a replaceable article 110 comprising the aerosolgenerating medium, for instance an article as described elsewhere herein, to generate an aerosol or other inhalable medium which is inhaled by a user of the device 100.

The device 100 and replaceable article 110 together form a system.

The device 100 comprises a housing 102 (in the form of an outer cover) which surrounds and houses various components of the device 100. The device 100 has an opening 104 in one end, through which the article 110 may be inserted for heating by a heating assembly. In use, the article 110 may be fully or partially inserted into the heating assembly where it may be heated by one or more components of the heater assembly.

The device 100 of this example comprises a first end member 106 which comprises a lid 108 which is moveable relative to the first end member 106 to close the opening 104 when no article 110 is in place. In Figure 4, the lid 108 is shown in an open configuration, however the lid 108 may move into a closed configuration. For example, a user may cause the lid 108 to slide in the direction of arrow "B".

The device 100 may also include a user-operable control element 112, such as a button or switch, which operates the device 100 when pressed. For example, a user may turn on the device 100 by operating the switch 112.

The device 100 may also comprise an electrical component, such as a socket/port 114, which can receive a cable to charge a battery of the device 100. For example, the socket 114 may be a charging port, such as a USB charging port.

Examples

Example 1 - Producing a bandcast sheet material

A sheet material was produced by a bandcasting process from a slurry comprising the following components: fibre; binder; filler; and water.

The slurry was cast as a sheet onto a belt and dried. The drying mechanism involved applying steam below the band and hot air above the band. The dried sheet was removed from the belt. The dried sheet had a smooth surface which had been in contact with the belt, and a rough surface which was uppermost when the slurry was cast on the belt.

A first dried sheet may have the composition indicated in Table 1. Table 1

A further sheet was manufactured in the same manner using a slurry which further included additives which are optional according to the present disclosure and which may afford the resultant sheet some combustion retarding properties. These additives were sodium chloride and magnesium oxide.

This alternative dried sheet had the composition indicated in Table 2.

Table 2

The dried sheet had the properties set out in Table 3

Table 3

Example 2 - Preparing an aerosol-generating article

The sample sheet materials discussed above were used to manufacture aerosol generating articles comprising a rod of aerosol-generating material. The sheet material was fed through machinery and used to wrap a rod of aerosol generating material. The speed at which sticks could be manufactured (using the same machinery and the same aerosol-generating material) was compared to that using a conventional paper wrapper and an aluminium foil wrapper. The machine speeds observed are shown in Table 4 and demonstrate a significant technical advantages associated with the wrappers of the present invention.

Table 4

Example 3 - Assessing the quality of the manufactured rods

The sample aerosol generating articles produced according to Example 2 with a cut rag type aerosol-generating material were tested to assess the ability of the wrapper to hold the aerosol-generating material within the article. The simple test involved blowing through the article and it was found that it was not possible to blow any of the cut rag aerosol-generating material out in this manner. This is a subjective assessment of how well the tobacco was held in the rod and the results indicated a higher resistance to "End Fall Out" than observed with similar articles having conventional paper or foil wrappers.

Example 4 - Assessing the combustion-retarding properties of wrappers

The ability of wrappers according to some aspects of the invention to resist of retard combustion of a consumable was tested. Consumables intended for heating but not combustion were made using standard components and with a series of different wrapper materials. Samples were prepared with a conventional paper wrapper (control), with an alufoil wrapper (control), or with a wrapper (test) as disclosed herein.

The test wrappers were prepared using the bandcast paper described in Example 1.

The consumables tested were standard demi-slim format with 75 mm total stick length including a 34 mm tobacco rod. The filter section comprised a cellulose acetate commercial specification filter without a capsule.

The consumables were constructed to have 70% ventilation for the control samples and 50% ventilation of the test wrapper. Then these THP consumables were smoked on a smoking machine and smoked (55 ml puffs every 30 seconds for a total of 10 puffs).

The start length and finish length, and the start mass and finish mass, were measured to assess how much of the consumable was consumed. In addition, the puff emissions were captured in a pad and the start and finish pad mass were assessed. Finally, the number of puffs before the consumable extinguished following lighting was assessed. The results in the tables below each show the averages from five samples. Table 5

Table 6

Table 7

The data shows that a consumable with a conventional paper wrapper can be lit like a combustible cigarette and that puffing on the lit consumable allowed it to be smoked, with combustion being maintained in most samples and the aerosol-generating section being smoked with the attendant emissions.

In contrast, alufoil wrappers which are used in THP consumables to prevent combustion and smoking of the consumable like a combustible cigarette were shown to be effective in this. The length of the consumables was unchanged and the mass was substantially unchanged, with no significant emissions.

The test paper wrappers were shown to perform similarly to the alufoil wrappers, with only slightly greater loss of mass and emissions on the pad. Thus, these wrappers are an effective alternative to alufoil wrappers in preventing the combustion and smoking of THP consumables like a combustible cigarette.

The various embodiments described herein are presented only to assist in understanding and teaching the claimed features. These embodiments are provided as a representative sample of embodiments only, and are not exhaustive and/or exclusive. It is to be understood that advantages, embodiments, examples, functions, features, structures, and/or other aspects described herein are not to be considered limitations on the scope of the invention as defined by the claims or limitations on equivalents to the claims, and that other embodiments may be utilised and modifications may be made without departing from the scope of the claimed invention. Various embodiments of the invention may suitably comprise, consist of, or consist essentially of, appropriate combinations of the disclosed elements, components, features, parts, steps, means, etc., other than those specifically described herein. In addition, this disclosure may include other inventions not presently claimed, but which may be claimed in future.

Claims

1. A wrapper for use in an aerosol generating article, the wrapper having a first surface with a Bendtsen roughness of at least about 1200 ml/min, and a second surface with a Bendtsen roughness of no more than about 500 ml/min.

2. A wrapper as claimed in claim 1, wherein the wrapper has a weight of from about 20 to about 90 g/m².

3. A wrapper as claimed in claim 1 or claim 2, wherein the wrapper has a thickness of from about 50 to about 200 pm.

4. A wrapper as claimed in any one of claims 1 to 3, wherein the wrapper has a dry tensile strength of at least about 35 N/15mm.

5. A wrapper as claimed in any one of claims 1 to 4, wherein the wrapper has a permeability of about zero (0) CU (Coresta Units).

6. A wrapper as claimed in any one of claims 1 to 5, wherein the opacity of the smoother surface of the wrapper is greater than the opacity of the rougher surface of the wrapper.

7. A wrapper as claimed in any one of claims 1 to 6, wherein the brightness of the smoother surface of the wrapper is less than the brightness of the rougher surface of the wrapper and/or wherein the whiteness of the smoother surface of the wrapper is less than the whiteness of the rougher surface of the wrapper.

8. A wrapper as claimed in any one of claims 1 to 7, wherein the wrapper comprises one or more binders.

9. A wrapper as claimed in claim 8, wherein the wrapper comprises one or more binders in an amount of from about 1 to about 20% by weight of the wrapper (on a dry weight basis).

10. A wrapper as claimed in any one of claims 1 to 9, wherein the wrapper comprises a single sheet.

11. A wrapper as claimed in any one of claims 1 to 9, wherein the wrapper comprises two superposed and bonded sheets each having a different surface roughness.

12. A wrapper as claimed in any one of claims 1 to 11, comprising at least one combustion retarding additive.

13. A wrapper as claimed in claim 12, wherein the at least one combustion retarding additive is included in an amount of from about 3 to about 70% by weight of the wrapper (on a dry weight basis).

14. A wrapper as claimed in claim 12 or claim 13, wherein the combustion retarding additive comprises an alkali metal halide or an alkaline earth metal oxide, or both.

15. A wrapper as claimed in any one of claims 12 to 14, wherein the combustion retarding additive is incorporated in the wrapper or wherein the combustion retarding additive is provided in a coating on a surface of the wrapper.

16. An article for use in a non-combustible aerosol provision system, the article comprising: a rod comprising an aerosol-generating material, and a wrapper as claimed in any one of claims 1 to 15.

17. An article as claimed in claim 16, wherein the article has a mouth end and a distal end, and wherein the article comprises a combustion retarding additive located at the distal end.

18. An article as claimed in claim 16 or claim 17, wherein the article comprises a plug comprising the combustion retarding additive.

19. An article as claimed in claim 16 or claim 17, wherein the article comprises a coating comprising the combustion retarding additive.

20. An article as claimed in claim 19, wherein the coating is applied to the wrapper or wherein the coating is applied to the aerosol-generating material.

21. An article as claimed in any one of claims 16 to 20, wherein the wrapper includes vents or perforations.

22. A non-combustible aerosol provision system comprising an article as claimed in any one of claims 16 to 21.

23. A method of manufacturing a wrapper as claimed in any one of claims 1 to 15, comprising: forming a slurry; casting the slurry on a band or belt; drying the slurry; and removing the dried slurry from the band or belt.

24. Use of a bandcast sheet material as a wrapper in an article for use in a noncombustible aerosol provision system.

25. Use of a wrapper as claimed in any one of claims 1 to 15 to reduce the loss of aerosol generating material from an article for use in a non-combustible aerosol provision system.