Stable wrapper for aerosol-generating articles

Abstract

There is provided an aerosol-generating article (10) comprising an aerosol-generating substrate (12) and a wrapper (50) disposed about the aerosol-generating substrate, the aerosol-generating substrate comprising nicotine. The wrapper includes a paper layer having a thickness / gram weight per square meter of about 1.2 microns / gsm or less.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of June 8, 2020, application number 202080035496.X, and invention name “Stable packaging for aerosol generating products”.

[0002] The present disclosure relates to a package for use in an aerosol-generating article, wherein the package has a high paper density and can be used with an aerosol-generating substrate.

[0003] Aerosol generating articles in which an aerosol generating substrate such as a tobacco-containing substrate is heated rather than burned are known in the art. Typically, in such heated aerosol generating articles, an aerosol is generated by transferring heat from a heat source to a physically separated aerosol generating substrate or material, which may be positioned in contact with, inside, around or downstream of the heat source. During use of the aerosol generating article, volatile compounds are released from the aerosol generating substrate by heat transfer from the heat source and are entrained in the air drawn by the aerosol generating article. When the released compounds cool, the compounds condense to form an aerosol.

[0004] The paper used to wrap the aerosol generating substrate can absorb aerosol formers, water and other liquid compounds found in the mainstream smoke or aerosol passing through the aerosol generating product, or humidity or moisture around the paper. The absorbed liquid may contaminate or weaken the paper and adversely affect the appearance and structural integrity of the aerosol generating product. Heated aerosol generating products are particularly prone to getting wet and damage due to the high aerosol former levels in the aerosol generating substrate of these heated aerosol generating products. When the aerosol components are absorbed by the packaging, the heated aerosol generating products will be particularly prone to swelling, resulting in difficulty in removing from the heating device. When the heated aerosol generating products are tightly received and then removed from the heating device, they will be particularly prone to damage.

[0005] It would be desirable to provide a visually and mechanically stable encapsulated aerosol-generating substrate, particularly for aerosol-generating articles containing high liquid levels or aerosol-forming agent levels.

[0006] It would be desirable to provide an aerosol-generating article comprising a packaging that does not swell due to absorption of water or compounds contained in the aerosol-generating substrate.

[0007] It is desirable to provide an aerosol-generating article comprising a package that provides a grease barrier to grease compounds contained in an aerosol-generating substrate.

[0008] It is also desirable that the packaging does not affect the taste of the aerosol generated by the aerosol-generating article.

[0009] It is also desirable that the packaging not readily burn when in proximity to a heating element.

[0010] The present invention may aim to at least partially address one or more of the desired technical benefits mentioned above.

[0011] According to the present disclosure, an aerosol-generating article is provided, comprising an aerosol-generating substrate and a wrapper disposed around the aerosol-generating substrate, wherein the aerosol-generating substrate comprises nicotine. The wrapper comprises a paper layer having a thickness / grammage of about 1.2 micrometers / gsm or less.

[0012] According to the present disclosure, an aerosol-generating article is provided, comprising an aerosol-generating substrate and a wrapper disposed around and in contact with the aerosol-generating substrate, wherein the aerosol-generating substrate comprises nicotine and at least about 10% of an aerosol former, the aerosol former comprising glycerin. The wrapper comprises a paper layer having a thickness / grammage of about 1.2 microns / gsm or less.

[0013] According to the present disclosure, an aerosol-generating article is provided. The aerosol-generating article may include an aerosol-generating substrate. The aerosol-generating substrate may include a wrapper. The wrapper may be disposed around the aerosol-generating substrate. The wrapper includes a paper layer having a thickness / grammage of about 1.2 micrometers / gsm or less.

[0014] Preferably, the paper layer has a thickness / grammage in the range of about 1.0 microns / gsm to about 1.2 microns / gsm. The paper layer may have a thickness of less than about 50 microns, or less than about 40 microns. The wrapper includes a paper layer having a grammage in the range of about 25 gsm to about 45 gsm, or about 35 gsm to about 40 gsm.

[0015] Preferably, the paper layer has a thickness / grammage of about 1.2 microns / gsm or less and a water contact angle of at least about 30 degrees. The paper layer may have a water contact angle of at least about 40 degrees, or at least about 45 degrees.

[0016] The term "MD" refers to the machine direction of the package. The machine direction is the direction in which the paper stock flows into and through the papermaking machine. The machine direction is the circumferential direction of the paper roll wound from the paper machine. The machine direction may also be called the grain direction.

[0017] The term "CD" refers to the cross direction of the package. The cross direction of the package is the direction in the plane of the package. The cross direction of the package is orthogonal to the longitudinal direction of the package.

[0018] The paper layer may have a CD / MD elongation at break ratio of about 2.5 or less. The paper layer may have a CD / MD elongation at break ratio of about 2.2 or less, or about 2 or less. The paper layer may have a CD / MD elongation at break ratio in the range of about 1.8 to 2.2.

[0019] Preferably, the packaging comprises a paper layer having a thickness / grammage of about 1.2 micrometers / gsm or less and having a negative result for at least one sample of the kit oil of the method Tappi 559cm-02 Classic Method 2002. The paper layer may have a negative result for at least five samples of the kit oil of the method Tappi 559cm-02 Classic Method 2002, or for all ten samples of the kit oil.

[0020] Preferably, the wrapper comprises two paper layers, wherein the first paper layer has a first thickness / grammage value, the second paper layer has a second thickness / grammage value, and the first thickness / grammage value is less than the second thickness / grammage value. The first thickness / grammage value may be less than 1.2 microns / gsm and the wrapper may have a total thickness of less than about 80 microns.

[0021] Preferably, the paper layer comprises PVOH (polyvinyl alcohol) or silicon. The paper layer may comprise a surface treatment agent, wherein the surface treatment agent comprises PVOH or silicon. The addition of PVOH (polyvinyl alcohol) or silicon may improve the grease barrier properties of the packaging.

[0022] The term "silicon" refers to siloxane. Silicon or siloxane preferably comprises polydimethylsiloxane.

[0023] Preferably, the aerosol-generating substrate may comprise a homogenised tobacco material.Tobacco The homogenised tobacco material may comprise tobacco material, from about 1% to about 5% of a binder and from about 5% to about 30% of an aerosol former by dry weight.

[0024] Preferably, the aerosol-generating substrate may comprise a gel composition. The gel composition may comprise a majority (by weight) of glycerol. The gel composition may comprise xanthan gum.

[0025] Preferably, the aerosol generating substrate may comprise a metal induction heating element. The metal induction heating element may comprise a plurality of metal induction heating elements. The metal induction heating element may comprise a metal induction heating ring element.

[0026] The wrapper may be formed from a single paper layer. The wrapper may be formed from two paper layers. The wrapper may be formed from more than two paper layers.

[0027] Preferably, the wrapper covers at least 20%, at least 50%, at least 80%, at least 90%, at least 95%, at least 99% or preferably about the entire length (whole length) of the aerosol-generating substrate. The wrapper preferably covers the entire aerosol-generating substrate and does not extend beyond the aerosol-generating substrate.

[0028] When the package has two or more paper layers, the first paper layer may have the unique properties described herein and the second paper layer may be considered a conventional paper layer. The second paper layer may preferably be disposed above the first paper layer. Alternatively, the first paper layer may be disposed above the second paper layer. Preferably, the first paper layer having the unique properties described herein is in contact with the aerosol-forming substrate.

[0029] When the wrapper has two or more paper layers, the first paper layer may have the unique properties described herein and the second paper layer may also have the unique properties described herein. All paper layers forming the wrapper may have the unique properties described herein. In particular, one or two paper layers forming the wrapper may contain PVOH (polyvinyl alcohol) or silicon. One or two paper layers forming the wrapper may contain a surface treatment agent, which contains PVOH or silicon.

[0030] Advantageously, an aerosol-generating article comprising a wrapper as described herein can reduce wetting, absorption of water, aerosol formers or grease in smoke or aerosol passing through the aerosol-generating article. Thus, even when high aerosol former levels are included in the aerosol-generating substrate, swelling, visible contamination and physical weakening of the wrapper portion of the aerosol-generating article can be reduced.

[0031] Advantageously, the aerosol-generating article provides a visually and mechanically stable wrapped aerosol-generating substrate that will avoid swelling. This is particularly applicable to heat-rather-than-burn aerosol-generating articles that can be inserted into a heating device. The aerosol-generating article packaging will resist combustion if approached by a heating element, so an inductive heating element can be incorporated into the overall aerosol-generating substrate.

[0032] The term "aerosol-generating article" is used herein to refer to an article in which an aerosol-generating substrate is heated to generate and deliver an inhalable aerosol to a consumer. As used herein, the term "aerosol-generating substrate" refers to a substrate capable of releasing volatile compounds upon heating to generate an aerosol.

[0033] A conventional cigarette will be ignited when a user applies a flame to one end of the cigarette and draws air through the other end. The local heat provided by the flame and the oxygen in the air drawn through the cigarette causes the end of the cigarette to be ignited, and the resulting combustion produces inhalable smoke. In contrast, in heated aerosol generating products, aerosols are generated by heating a flavor generating substrate such as tobacco. Known heated aerosol generating products include, for example, electrically heated aerosol generating products and aerosol generating products in which aerosols are generated by heat transfer from a combustible fuel element or a heat source to a physically separated aerosol-forming substrate. For example, aerosol generating products according to the present disclosure find specific applications in aerosol generating systems, which include electrically heated aerosol generating devices having internal heater blades, which are suitable for insertion into strips of aerosol generating substrates. In the prior art, such as in EP 0822670, aerosol generating products of this type are described.

[0034] As used herein, the term "aerosol-generating device" refers to a device comprising a heater element that interacts with an aerosol-generating substrate of an aerosol-generating article to generate an aerosol.

[0035] As used herein, the term "aerosol-generating system" refers to the combination of an aerosol-generating device and an aerosol-generating article.

[0036] The term "aerosol-generating substrate" refers to a substance that is capable of generating or releasing an aerosol. The aerosol-generating substrate may be a solid, a paste, a gel, a slurry, a liquid, or may comprise any combination of solid, paste, gel, slurry and liquid compounds. Preferably, the aerosol-generating substrate is a solid or gel composition. The aerosol-generating substrate may preferably comprise nicotine.

[0037] The aerosol-generating article may comprise an aerosol-generating substrate and a mouthpiece. The mouthpiece may comprise a filter. The tipping wrapper may join the filter to the aerosol-generating substrate.

[0038] The aerosol generating substrate can be a solid composition. The composition can include plant-based materials. The aerosol generating substrate can include tobacco, and preferably tobacco contains volatile tobacco flavor compounds that are released from the aerosol generating substrate when heated. The aerosol generating substrate can include homogenized tobacco material, an aerosol forming agent, and a binding agent.

[0039] Nicotine can be present in the aerosol-generating substrate in a range of about 0.5 to about 10% by weight nicotine, or about 0.5 to about 5% by weight nicotine. Preferably, the aerosol-generating substrate can contain about 1 to about 3% by weight nicotine, or about 1.5 to about 2.5% by weight nicotine, or about 2% by weight nicotine.

[0040] The aerosol-generating substrate may include flavorants. Plant materials provide flavorants that can impart a flavor to the taste of the aerosol generated by the aerosol-generating article. Flavorants are any natural or artificial compounds that affect the sensory quality of the aerosol. Non-limiting examples of sources of flavorants include mints such as peppermint and spearmint, coffee, tea, cinnamon, cloves, cocoa, vanilla, eucalyptus, geranium, agave, and juniper; and combinations thereof.

[0041] The aerosol generating matrix may include essential oils. Essential oils may provide flavoring agents that impart a certain flavor to the taste of the aerosol generated by the aerosol generating article. Suitable essential oils include, but are not limited to, eugenol, peppermint oil, and spearmint oil. A preferred essential oil is eugenol. Essential oils may be present in the aerosol generating matrix in an amount of at least about 0.1% by weight, or at least about 0.5% by weight, or at least about 1% by weight. Essential oils may be present in the aerosol generating matrix in a range of about 0.1% by weight to about 10% by weight, or about 0.1% by weight to about 5% by weight, or about 0.5% by weight to about 2% by weight.

[0042] Aerosol generating substrates may include gel compositions. The term "gel" refers to being solid at room temperature. "Solid" in this context means that the gel has a stable size and shape and does not flow. Room temperature in this context means 25 degrees Celsius. A gel can be defined as a substantially dilute cross-linked system that does not exhibit fluidity in a steady state. Gels may be primarily liquid by weight, but they behave like solids due to the three-dimensional cross-linked network in the liquid. It is the cross-linking inside the fluid that gives the gel its structure (hardness). Thus, a gel can be a dispersion of liquid molecules in a solid, with liquid particles dispersed in a solid medium.

[0043] The gel composition may include a gelling agent that forms a solid medium, an aerosol forming agent such as glycerol dispersed in the solid medium, and nicotine dispersed in the glycerol. The composition forms a stable gel phase. The gel composition may include at least two gelling agents that form a solid medium, glycerol dispersed in the solid medium, and nicotine dispersed in the glycerol. The composition forms a stable gel phase. The gel composition may include a viscosity enhancer and a gelling agent that forms a solid medium, glycerol dispersed in the solid medium, and nicotine dispersed in the glycerol. The composition forms a stable gel phase. A gel composition may include nicotine, an aerosol forming agent, a viscosity enhancer, a hydrogen bond cross-linking gelling agent, and an ion cross-linking gelling agent. The gel composition may also include a divalent cation.

[0044] The term "viscosity increasing agent" refers to a compound which, when added uniformly in an amount of 0.3 wt. % to a mixture of 50 wt. % water / 50 wt. % glycerol at 25°C, increases viscosity without causing gel formation, and the mixture remains or remains fluid. Preferably, the viscosity increasing agent refers to a compound which, when added uniformly in an amount of 0.3 wt. % to a mixture of 50 wt. % water / 50 wt. % glycerol at 25°C, increases viscosity without causing gel formation. -1 The viscosity increasing agent is a compound that increases the viscosity to at least 50 cP, preferably at least 200 cP, preferably at least 500 cP, preferably at least 1000 cP at a shear rate of 1.5 % to 2.5 % by weight without causing gel formation, and the mixture remains or retains fluid. Preferably, the viscosity increasing agent refers to ... when uniformly added to a mixture of -1 A compound that increases viscosity at a shear rate of at least 2 times, or at least 5 times, or at least 10 times, or at least 100 times higher than before addition without causing gel formation, the mixture remains or remains fluid.

[0045] The viscosity values ​​reported herein can be measured using a Brookfield RVT viscometer at 25°C and 6 revolutions per minute (rpm) with a spinning disk RV #2 spindle.

[0046] The term "gelling agent" refers to a compound that forms a solid medium or carrier matrix that results in a gel when uniformly added to a mixture of 50 wt % water / 50 wt % glycerol in an amount of about 0.3 wt %. Gelling agents include, but are not limited to, hydrogen bond cross-linking gelling agents and ionic cross-linking gelling agents.

[0047] The term "hydrogen-bonding cross-linking gelling agent" refers to a gelling agent that forms non-covalent cross-links or physical cross-links via hydrogen bonding. Hydrogen bonding is a type of electrostatic dipole-dipole attraction between molecules, rather than a covalent bond to a hydrogen atom. It is produced by the attractive force between a hydrogen atom covalently bonded to an extremely electronegative atom, such as an N, O, or F atom, and another extremely electronegative atom.

[0048] The term "ionic crosslinking gelling agent" refers to a gelling agent that forms non-covalent crosslinks or physical crosslinks through ionic bonds. Ionic crosslinking involves the association of polymer chains through non-covalent interactions. A crosslinked network is formed when oppositely charged multivalent molecules are electrostatically attracted to each other to form a crosslinked polymer network.

[0049] The gel composition comprises an aerosol former. Ideally, the aerosol former is substantially resistant to thermal degradation at the operating temperature of the associated aerosol generating device. Suitable aerosol formers include, but are not limited to, polyols such as triethylene glycol, 1,3-butylene glycol, and glycerol; esters of polyols such as glycerol monoacetate, glycerol diacetate, or glycerol triacetate; and aliphatic esters of mono-, di-, or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate. The polyol or mixture thereof may be one or more of triethylene glycol, 1,3-butylene glycol, glycerol (glycerol or propane-1,2,3-triol), or polyethylene glycol. The aerosol former is preferably glycerol.

[0050] The gel composition may include a majority of an aerosol former such as glycerol. The gel composition may include a mixture of water and glycerol, wherein the glycerol forms a majority of the gel composition (by weight). The glycerol may form at least about 50% by weight of the gel composition. The glycerol may form at least about 60% by weight, or about 65% by weight, or about 70% by weight of the gel composition. The glycerol may form about 70% to about 80% by weight of the gel composition. The glycerol may form about 70% to about 75% by weight of the gel composition.

[0051] The gel composition preferably contains no water or contains a small amount of water. When the gel composition does not contain water or contains a small amount of water, the gel composition may contain higher levels of other compounds such as aerosol formers, gelling agents, viscosity enhancers and nicotine. Moreover, the gel composition that does not contain water or contains a small amount of water is easier to vaporize and requires less energy to vaporize. The aerosol formed by the gel composition that does not contain water or contains a small amount of water can be perceived by the user as less hot. Preferably, the gel composition contains less than about 40% by weight, preferably less than about 30% by weight, preferably less than about 25% by weight of water. The gel composition may contain less than about 20% by weight or less than about 15% by weight or less than about 10% by weight or less than about 5% by weight of water. The gel composition may preferably contain some water. When the gel composition contains some water, the gel composition is more stable. Preferably, the gel composition contains at least about 1% by weight, or at least about 2% by weight, or at least about 5% by weight of water. Preferably, the gel composition contains at least about 10% by weight or at least about 15% by weight of water. Preferably, the gel composition comprises water in the range of about 15% to about 25% by weight.

[0052] The gel composition may include a gelling agent, which is a hydrogen-bonding cross-linking gelling agent and an ionic cross-linking gelling agent. The gel composition may also include a viscosity-increasing agent. The gelling agent may form a solid medium in which the aerosol-forming agent may be dispersed. The gelling agent may form a solid medium in which the aerosol-forming agent and water may be dispersed. The viscosity-increasing agent in combination with the hydrogen-bonding cross-linking gelling agent and the ionic cross-linking gelling agent appears to unexpectedly support the solid medium and maintain the gel composition, even when the gel composition contains high glycerol levels.

[0053] The gel composition may include a gelling agent in a range of about 0.4 wt % to about 10 wt %. Preferably, the composition may include a gelling agent in a range of about 0.5 wt % to about 8 wt %. Preferably, the composition may include a gelling agent in a range of about 1 wt % to about 6 wt %. Preferably, the composition may include a gelling agent in a range of about 2 wt % to about 4 wt %. Preferably, the composition may include a gelling agent in a range of about 2 wt % to about 3 wt %.

[0054] The gel composition may include a viscosity enhancer in the range of about 0.2 wt % to about 5 wt %. Preferably, the viscosity enhancer is in the range of about 0.5 wt % to about 3 wt %. Preferably, the viscosity enhancer is in the range of about 0.5 wt % to about 2 wt %. Preferably, the viscosity enhancer is in the range of about 1 wt % to about 2 wt %.

[0055] The gel composition may include a viscosity enhancer, a hydrogen-bonded cross-linked gelling agent, and an ionic cross-linked gelling agent in a total amount of about 1% to about 8% by weight in the gel composition. Preferably, the gel composition may include a viscosity enhancer, a hydrogen-bonded cross-linked gelling agent, and an ionic cross-linked gelling agent in a total amount of about 2% to about 6% by weight in the gel composition. Preferably, the gel composition may include a viscosity enhancer, a hydrogen-bonded cross-linked gelling agent, and an ionic cross-linked gelling agent in a total amount of about 3% to about 5% by weight in the gel composition.

[0056] The gel composition may include a viscosity enhancer, a hydrogen-bonded cross-linked gelling agent, and an ionic cross-linked gelling agent, each independently present in the gel composition in a range of about 0.3 wt % to about 3 wt %. Preferably, the gel composition may include a viscosity enhancer, a hydrogen-bonded cross-linked gelling agent, and an ionic cross-linked gelling agent, each independently present in the gel composition in a range of about 0.5 wt % to about 2 wt %. Preferably, the gel composition may include a viscosity enhancer, a hydrogen-bonded cross-linked gelling agent, and an ionic cross-linked gelling agent, each independently present in the gel composition in a range of about 1 wt % to about 2 wt %.

[0057] The thickener may comprise one or more of xanthan gum, carboxymethyl cellulose, microcrystalline cellulose, methyl cellulose, gum arabic, guar gum, λ-carrageenan or starch. The thickener may preferably comprise xanthan gum.

[0058] The gel composition may include a viscosity increasing agent such as xanthan gum in the range of about 0.2 wt % to about 5 wt %. Preferably, the xanthan gum may be in the range of about 0.5 wt % to about 3 wt %. Preferably, the xanthan gum may be in the range of about 0.5 wt % to about 2 wt %. Preferably, the xanthan gum may be in the range of about 1 wt % to about 2 wt %.

[0059] The hydrogen bond cross-linking gelling agent may comprise one or more of galactomannan, gelatin, agarose or konjac gum or agar. The hydrogen bond cross-linking gelling agent may preferably comprise agar.

[0060] The gel composition may include a hydrogen-bonded cross-linked gelling agent such as agar in a range of about 0.3 wt % to about 5 wt %. Preferably, the composition may include a hydrogen-bonded cross-linked gelling agent in a range of about 0.5 wt % to about 3 wt %. Preferably, the composition may include a hydrogen-bonded cross-linked gelling agent in a range of about 1 wt % to about 2 wt %.

[0061] The ionically cross-linked gelling agent may include low acyl gellan gum, pectin, kappa carrageenan, iota carrageenan or alginate. The ionically cross-linked gelling agent may preferably include low acyl gellan gum.

[0062] The gel composition may include an ionically cross-linked gelling agent such as low acyl gellan gum in a range of about 0.3 wt % to about 5 wt %. Preferably, the composition may include an ionically cross-linked gelling agent in a range of about 0.5 wt % to about 3 wt %. Preferably, the composition may include an ionically cross-linked gelling agent in a range of about 1 wt % to about 2 wt %.

[0063] The gel composition may also include divalent cations. Preferably, the divalent cations may include calcium ions, such as calcium lactate in solution. For example, divalent cations (such as calcium ions) may assist in gel formation of a composition comprising a gelling agent, such as an ionically crosslinked gelling agent. Ionic effects may assist in gel formation. The divalent cations may be present in the gel composition in a range of about 0.1 to about 1% by weight, or about 0.5% by weight.

[0064] The gel composition may also include an acid. The acid may include a carboxylic acid. The carboxylic acid may include a ketone group. Preferably, the carboxylic acid may include a ketone group having less than about 10 carbon atoms, or less than about 6 carbon atoms, or less than about 4 carbon atoms, such as levulinic acid or lactic acid. Preferably, the carboxylic acid has three carbon atoms (such as lactic acid). Lactic acid surprisingly improves the stability of the gel composition even more than similar carboxylic acids. The carboxylic acid may help gel formation. During storage, the carboxylic acid may reduce the change in nicotine concentration within the gel composition.

[0065] The gel composition may include a carboxylic acid such as lactic acid in a range of about 0.1 wt % to about 5 wt %. Preferably, the carboxylic acid may be in a range of about 0.5 wt % to about 3 wt %. Preferably, the carboxylic acid may be in a range of about 0.5 wt % to about 2 wt %. Preferably, the carboxylic acid may be in a range of about 1 wt % to about 2 wt %.

[0066] Nicotine is contained in the gel composition. Nicotine can be added to the composition in free base form or salt form. The gel composition may contain about 0.5% by weight to about 10% by weight of nicotine, or about 0.5% by weight to about 5% by weight of nicotine. Preferably, the gel composition may contain about 1% by weight to about 3% by weight of nicotine, or about 1.5% by weight to about 2.5% by weight of nicotine, or about 2% by weight of nicotine. The nicotine component of the gel formulation may be the most volatile component in the gel formulation. In some aspects, water may be the most volatile component in the gel formulation, and the nicotine component of the gel formulation may be the second most volatile component in the gel formulation.

[0067] The aerosol generating system may comprise: a heat source; an aerosol generating substrate; at least one air inlet downstream of the aerosol generating substrate; and an air flow path extending between the at least one air inlet and the mouth end of the article. The heat source is preferably upstream of the aerosol generating substrate. The heat source may be integrated with the aerosol generating device and the combustible aerosol generating article may be releasably received within the aerosol generating device.

[0068] The heat source may be a combustible heat source, a chemical heat source, an electrical heat source, a heat sink, or any combination thereof. The heat source may be an electrical heat source, preferably shaped in the form of a blade that can be inserted into the aerosol generating substrate. Alternatively, the heat source may be configured to surround the aerosol generating substrate, and may therefore be in the form of a hollow cylinder, or any other such suitable form. Alternatively, the heat source is a combustible heat source. As used herein, a combustible heat source is a heat source that generates heat by burning itself during use, which, unlike cigarettes, cigars or cigarillos, does not involve burning an aerosol generating substrate. The combustible heat source may comprise carbon and an ignition aid, such as a metal peroxide, superoxide or nitrate, wherein the metal is an alkali metal or an alkaline earth metal.

[0069] The aerosol-generating substrate may include an induction heating element or susceptor or a plurality of induction heating elements or susceptors. The induction heating element or susceptor heats in the presence of an alternating or fluctuating electromagnetic field. When heated by induction heating, the fluctuating electromagnetic field is transmitted through the aerosol-generating article to the induction heating element or susceptor, causing the susceptor or induction heating element to convert the fluctuating field into thermal energy, thereby heating the aerosol-generating substrate.

[0070] The induction heating element or susceptor may be formed of any material that can be inductively heated to a temperature sufficient to generate an aerosol from an aerosol generating substrate. The induction heating element or susceptor may comprise a metal or carbon. Preferred induction heating elements or susceptors may comprise ferromagnetic materials, such as ferritic iron, or ferromagnetic steel or stainless steel. The induction heating element or susceptor may comprise aluminum. The induction heating element or susceptor may be formed of 400 series stainless steel, such as 410 grade, or 420 grade, or 430 grade stainless 20 steel. When placed in an electromagnetic field with similar frequency and field strength values, different materials will dissipate different amounts of energy. Preferably, the induction heating element or susceptor is heated to a temperature exceeding 250 degrees Celsius. However, preferably, the induction heating element or susceptor is heated to less than 350 degrees Celsius to prevent combustion of the material in contact with the susceptor.

[0071] The inductive heating element or susceptor may be located adjacent to the packaging of the aerosol-generating substrate, as the packaging described herein advantageously resists combustion.

[0072] The term "mouthpiece" is used herein to refer to the portion of the aerosol-generating article that is designed to contact the mouth of the consumer. The mouthpiece may be a portion of the aerosol-generating article that may include a filter, or in some cases, the mouthpiece may be defined by the confines of a tipping wrapper. In other cases, the mouthpiece may be defined as a portion of the aerosol-generating article that extends about 40 mm from the mouth end of the aerosol-generating article or about 30 mm from the mouth end of the aerosol-generating article.

[0073] The terms "upstream" and "downstream" refer to the relative positions of elements of the aerosol-generating article with respect to the direction of the aerosol as it is drawn from the aerosol-generating substrate and through the mouthpiece.

[0074] The terms "wrapper" or "paper wrapper" are interchangeable and refer to one or more layers of wrapping material surrounding the aerosol-generating substrate to contain the aerosol-generating substrate or to maintain the shape of the aerosol-generating article and formed of paper. The wrapper will reduce spots on the outer surface of the aerosol-generating article. Preferably, the wrapper contacts the aerosol-generating substrate.

[0075] The term "hydrophobic" refers to a surface that exhibits the property of repelling water. A useful method of determining this is to measure the water contact angle. The "water contact angle" is the angle conventionally measured by a liquid where the liquid / vapor interface meets a solid surface. It quantifies the wettability of a liquid to a solid surface via Young's equation.

[0076] The present disclosure relates to a packaging for use in an aerosol-generating article, wherein the packaging comprises a paper layer having a high density and can be used with an aerosol-generating substrate. According to the present disclosure, an aerosol-generating article is provided, comprising an aerosol-generating substrate and a packaging disposed around the aerosol-generating substrate, wherein the aerosol-generating substrate comprises nicotine. The packaging comprises a paper layer having a thickness / grammage of about 1.2 micrometers / gsm or less.

[0077] Preferably, the wrapper comprises a paper layer having a thickness / grammage in the range of about 0.8 microns / gsm to about 1.2 microns / gsm. The paper layer may have a thickness / grammage in the range of about 1.0 microns / gsm to about 1.2 microns / gsm. The paper layer may have a thickness / grammage of about 1.0 microns / gsm. The paper layer may have a thickness / grammage of about 0.9 microns / gsm. The paper layer may have a thickness / grammage of about 1.0 microns / gsm. The paper layer may have a thickness / grammage of about 1.1 microns / gsm. The paper layer may have a thickness / grammage of about 1.2 microns / gsm.

[0078] The paper layer may have a thickness of less than about 50 microns, or less than about 40 microns. The paper layer may have a thickness in the range of about 10 microns to about 50 microns. The paper layer may have a thickness in the range of about 20 microns to about 50 microns. The paper layer may have a thickness in the range of about 30 microns to about 50 microns. The paper layer may have a thickness in the range of about 35 microns to about 50 microns. The paper layer may have a thickness in the range of about 35 microns to about 40 microns. The paper layer may have a thickness in the range of about 40 microns to about 50 microns.

[0079] The paper layer may have a grammage per square meter in the range of about 25gsm to about 45gsm. The paper layer may have a grammage per square meter in the range of about 30gsm to about 45gsm. The paper layer may have a grammage per square meter in the range of about 35gsm to about 45gsm. The paper layer may have a grammage per square meter in the range of about 35gsm to about 40gsm.

[0080] In one embodiment, the paper layer has a grammage of about 35 gsm and a thickness of about 37 microns. The paper layer has a thickness / grammage value of about 1.06.

[0081] Preferably, the paper layer comprises PVOH (polyvinyl alcohol) or silicon. In one embodiment, the paper layer comprises PVOH (polyvinyl alcohol). PVOH may be applied to the paper layer as a surface coating. PVOH may be disposed on the outer surface of the paper layer of the aerosol generating article. PVOH may be disposed on the outer surface of the paper layer of the aerosol generating article and form a layer. PVOH may be disposed on the inner surface of the paper layer of the aerosol generating article. PVOH may be disposed on the inner surface of the paper layer of the aerosol generating article and form a layer. PVOH may be disposed on the inner and outer surfaces of the paper layer of the aerosol generating article. PVOH may be disposed on the inner and outer surfaces of the paper layer of the aerosol generating article and form a layer.

[0082] The paper layer may include a surface treatment agent comprising PVOH or silicon. The paper layer may include a surface treatment agent comprising PVOH. The paper layer may include a surface treatment agent comprising silicon. This surface treatment agent may be applied to the outer surface of the paper layer. This surface treatment agent may be applied to the inner surface of the paper layer. This surface treatment agent may be applied to both the outer and inner surfaces of the paper layer. The addition of PVOH or silicon may improve the grease barrier properties of the paper layer.

[0083] The aerosol generating substrate may include a gel composition. The gel composition may include a majority of an aerosol forming agent such as glycerol. The gel composition may include nicotine, at least about 50% by weight of glycerol or at least 70% by weight of glycerol, at least about 0.2% by weight of a hydrogen bond cross-linking gelling agent, at least about 0.2% by weight of an ionic cross-linking gelling agent, and at least about 0.2% by weight of a viscosity increasing agent. The gel composition may include xanthan gum.

[0084] The aerosol-generating substrate may comprise a homogenised tobacco material.Tobacco The homogenised tobacco material may comprise tobacco material, from about 1% to about 5% of a binder and from about 5% to about 30% of an aerosol former by dry weight.

[0085] The aerosol generating substrate may comprise a metal induction heating element. The metal induction heating element may comprise a plurality of metal induction heating elements. The metal induction heating element may comprise a metal induction heating ring element.

[0086] It is expected that the packaging described herein can reduce and prevent the formation of spots visible to consumers on aerosol-generating articles. It has been observed that spots appear on aerosol-generating articles after storage in a humid environment or during consumption. Spots may be caused by the absorption of water or aerosol-forming agents (including any colored substances suspended or dissolved) into the cellulose fiber web that constitutes the packaging. Without being bound by any theory, water or aerosol-forming agents interact with the cellulose fibers of paper and change the organization of the fibers, resulting in local changes in the optical properties of the packaging such as brightness, color and opacity and mechanical properties such as tensile strength and permeability.

[0087] It is expected that the packaging described herein can reduce and prevent swelling of the aerosol-generating article. Reducing or preventing swelling of the aerosol-generating article will improve the usability of the aerosol-generating article to securely insert and remove the aerosol-generating article from the heating device without damaging the aerosol-generating article.

[0088] The wrapper is a portion of the aerosol-generating article that is disposed around the aerosol-generating substrate to help maintain the cylindrical form of the aerosol-generating article. The wrapper may contain the aerosol-generating substrate over at least about 50% of the length of the plug of the aerosol-generating substrate. Preferably, the wrapper contains the aerosol-generating substrate over at least about 90% of the length of the plug of the aerosol-generating substrate. More preferably, the wrapper contains the aerosol-generating substrate over at least about 100% of the length of the plug of the aerosol-generating substrate.

[0089] This wrapper can present a range of permeability, including impermeability. The permeability of cigarette paper is measured using the international standard test method ISO 2965:2009, and the results are presented in cubic centimeters per minute per square centimeter, and are referred to as "CORESTA units". The permeability of the wrapper described herein can be in the range of about 1 to about 10 CORESTA units, about 5 to about 20 CORESTA units, or about 1 to about 5 CORESTA units.

[0090] The wrapper can be formed by any cellulose material such as paper, wood, textiles, natural fibers and man-made fibers. Preferably, the wrapper does not contain fillers such as calcium carbonate. Preferably, the wrapper is formed by at least 90% by weight of a cellulose material. Preferably, the wrapper is formed by at least 95% by weight of a cellulose material.

[0091] The paper layer may be formed from any cellulosic material such as paper, wood, textiles, natural fibers and man-made fibers. Preferably, the paper layer does not contain fillers such as calcium carbonate. Preferably, the paper layer is formed from at least 90% by weight of a cellulosic material. Preferably, the paper layer is formed from at least 95% by weight of a cellulosic material.

[0092] The surface of the paper layer may have a water contact angle of at least about 30 degrees, at least about 35 degrees, at least about 40 degrees, or at least about 45 degrees. Hydrophobicity or water contact angle is measured using the TAPPI T558 test, and the results are presented as an interfacial contact angle and reported in "degrees", which can range from nearly zero to nearly 180 degrees.

[0093] The paper layer may have a CD / MD elongation at break ratio of about 2.5 or less. The paper layer may have a CD / MD elongation at break ratio of about 2.2 or less, or about 2 or less. The term "MD" refers to the machine direction of the paper layer. The machine direction may also be referred to as the grain direction of the paper layer. The term "CD" refers to the cross direction of the paper layer, which is orthogonal to the machine direction of the paper layer.

[0094] The paper layer may have a negative result (no visible spots) for at least one kit oil sample of the method Tappi 559cm-02 Classic Method 2002. The paper layer may have a negative result for at least five kit oil samples of the method Tappi 559cm-02 Classic Method 2002, or for all ten kit oil samples.

[0095] The wrapper may include two paper layers, wherein the first layer has a first thickness / grammage value, the second paper has a second thickness / grammage value, and the first thickness / grammage value is less than the second thickness / grammage value. The first thickness / grammage value is less than 1.2 microns / gsm and the wrapper has a total thickness of less than about 80 microns.

[0096] The wrapper may comprise two paper layers, wherein a first layer contacts the aerosol-forming substrate and a second layer covers the first layer and forms an outer surface of the aerosol-forming article. The first layer may have a first thickness / grammage value of less than 1.2 microns / gsm and the second layer may have a second thickness / grammage value of greater than 1.2 microns / gsm.

[0097] The wrapper may comprise two paper layers, wherein the first layer contacts the aerosol-forming substrate and the second layer covers the first layer and forms the outer surface of the aerosol-forming article. The first layer may have a first thickness / grammage value of less than 1.2 microns / gsm and the second layer may have a second thickness / grammage value of less than 1.2 microns / gsm.

[0098] The packaging material may comprise two paper layers, wherein the first layer contacts the aerosol-forming substrate and the second layer covers the first layer. The first layer may comprise PVOH (polyvinyl alcohol) or silicon or comprise a surface treatment agent comprising PVOH or silicon. The second layer may comprise PVOH (polyvinyl alcohol) or silicon or comprise a surface treatment agent comprising PVOH or silicon. Both the first layer and the second layer may comprise PVOH (polyvinyl alcohol) or silicon or comprise a surface treatment agent comprising PVOH or silicon. Only the first layer may comprise PVOH (polyvinyl alcohol) or silicon or comprise a surface treatment agent comprising PVOH or silicon. Only the second layer may comprise PVOH (polyvinyl alcohol) or silicon or comprise a surface treatment agent comprising PVOH or silicon.

[0099] Aerosol generating article comprises aerosol generating substrate, and the aerosol generating substrate may comprise tobacco charge surrounded by wrapper as described herein.Aerosol generating substrate may comprise any one or more suitable types of tobacco material or tobacco substitute in any suitable form.Aerosol generating substrate may comprise fire tube flue-cured tobacco, burley tobacco, Maryland tobacco, spice tobacco, special tobacco, homogenization or reconstituted tobacco or any combination thereof.Aerosol generating substrate may be provided in the following form: tobacco cut filler, tobacco leaf, processed tobacco material such as volume expansion or puffed tobacco, processed tobacco stem such as stem shreds (cut-rolled stem) or puffed stem shreds (cut-puffed stem), homogenized tobacco, reconstituted tobacco, cast leaf tobacco or its blend etc.Term " tobacco cut filler " is used in this article to indicate tobacco material mainly formed by the leaf blade part of tobacco leaf.Term " tobacco cut filler " is used in this article to indicate single species of Nicotiana (Nicotiana) forming tobacco cut filler blend and two or more species of Nicotiana.

[0100] As used herein, the term "homogenized tobacco" means the material formed by agglomerating particle tobacco. Homogenized tobacco may include reconstituted tobacco or cast leaf tobacco or a mixture of the two. The term "reconstituted tobacco" refers to a paper-like material that can be made from tobacco byproducts such as tobacco scraps, tobacco dust, tobacco stems or aforesaid mixtures. Reconstituted tobacco can be made by extracting soluble chemicals in tobacco byproducts, processing remaining tobacco fibers into sheets and then applying the extracted material to the sheets in concentrated form. The term "cast leaf tobacco" is used herein to refer to the product obtained by process well known in the art, based on the slurry comprising ground tobacco particles and a binder (for example, guar gum) cast onto a support surface such as a belt conveyor, drying the slurry and removing the dried sheet from the support surface. The illustrative method that is used to produce the aerosol generation substrate of these types is described in US 5,724,998, US 5,584,306, US 4,341,228, US 5,584,306 and US 6,216,706.Homogenized tobacco can be formed as the sheet material of curling, convolution, folding or otherwise compressing, is wrapped and forms strip then.For example, the sheet material that is used for homogenized tobacco material of the present invention can use the crimping unit of type described in CH-A-691156 to crimp, and described crimping unit comprises a pair of rotatable crimping rollers.But, should be appreciated that the sheet material that is used for homogenized tobacco material of the present invention can use other suitable machines and process to produce texture, and described other suitable machines and process make the sheet material deformation or perforation of homogenized tobacco material.

[0101] Aerosol-generating substrates used in aerosol-generating articles typically contain higher levels of aerosol-forming agents than combustion-type smoking articles such as cigarettes. Humectants may also be referred to as "aerosol-forming agents". Aerosol-forming agents are used to describe any suitable known compound or mixture of compounds that will promote the formation of an aerosol in use and substantially resist thermal degradation at the operating temperature of the aerosol-generating substrate. Suitable aerosol-forming agents are known in the art and include, but are not limited to: polyols, such as propylene glycol, triethylene glycol, 1,3-butylene glycol and glycerol; esters of polyols, such as glycerol monoacetate, glycerol diacetate or glycerol triacetate; and aliphatic esters of mono-, di- or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate. Preferred aerosol-forming agents are polyols or mixtures thereof, such as propylene glycol, triethylene glycol, 1,3-butylene glycol, most preferably glycerol or glycerol. The aerosol-generating substrate may contain a single aerosol-forming agent. Alternatively, the aerosol-generating substrate may contain a combination of two or more aerosol-forming agents.

[0102] The aerosol generating substrate can have a high aerosol forming agent level. As used herein, a high aerosol forming agent level refers to an aerosol forming agent content greater than about 10 wt %, or preferably greater than about 15 wt %, or more preferably greater than about 20 wt %. The aerosol generating substrate can also have an aerosol forming agent content between about 10 wt % to about 30 wt %, about 15 wt % to about 30 wt %, or about 20 wt % to about 30 wt %. The aerosol generating substrate can also have a glycerol content between about 10 wt % to about 30 wt %, about 15 wt % to about 30 wt %, or about 20 wt % to about 30 wt %.

[0103] The aerosol-generating substrate may comprise at least about 1 wt %, or at least about 2 wt %, or at least about 5 wt %, or at least about 7 wt %, or at least about 10 wt %, or at least about 12 wt %, or at least about 15 wt %, or at least about 18 wt % of an aerosol-forming agent. The aerosol-generating substrate may comprise an aerosol-forming agent in the range of about 1 to about 20 wt %, or about 5 to about 20 wt %, or about 10 to about 20 wt %.

[0104] The aerosol-generating substrate may comprise at least about 1 wt %, or at least about 2 wt %, or at least about 5 wt %, or at least about 7 wt %, or at least about 10 wt %, or at least about 12 wt %, or at least about 15 wt %, or at least about 18 wt % glycerol. The aerosol-generating substrate may comprise glycerol in a range of about 1 to about 20 wt %, or about 5 to about 20 wt %, or about 10 to about 20 wt %.

[0105] The gel-form aerosol-generating matrix may have a majority of aerosol formers, preferably glycerol. The gel composition may include a gelling agent that forms a solid medium, an aerosol former such as glycerol dispersed in the solid medium, and nicotine dispersed in the glycerol. The composition forms a stable gel phase. The gel composition may include at least two gelling agents that form a solid medium, glycerol dispersed in the solid medium, and nicotine dispersed in the glycerol. The composition forms a stable gel phase. The gel composition may include a tackifier and a gelling agent that forms a solid medium, glycerol dispersed in the solid medium, and nicotine dispersed in the glycerol. The composition forms a stable gel phase. A gel composition may include nicotine, an aerosol former, a tackifier, a hydrogen-bonded cross-linked gelling agent, and an ion-cross-linked gelling agent. The gel composition may also include a divalent cation.

[0106] The gel composition may include a majority of an aerosol former such as glycerol. The gel composition may include a mixture of water and glycerol, wherein the glycerol forms a majority of the gel composition (by weight). The glycerol may form at least about 50% by weight of the gel composition. The glycerol may form at least about 60% by weight, or about 65% by weight, or about 70% by weight of the gel composition. The glycerol may form about 70% to about 80% by weight of the gel composition. The glycerol may form about 70% to about 75% by weight of the gel composition.

[0107] The wrapper described herein is disposed around an aerosol-generating substrate. The wrapper can reduce the absorption of aerosol-forming compounds and water onto the wrapper when air is drawn through the heated aerosol-generating article.

[0108] Preferably, the aerosol-generating article may be generally cylindrical. This allows the aerosol to flow smoothly. The aerosol-generating article may have an outer diameter, for example, between 4 mm and 15 mm, between 5 mm and 10 mm, or between 6 mm and 8 mm. The aerosol-generating article may have a length, for example, between 10 mm and 60 mm, between 15 mm and 50 mm, or between 20 mm and 45 mm.

[0109] The resistance to suction (RTD) of an aerosol-generating article will vary with the length and size of the passage, the size of the hole, the size of the narrowest cross-sectional area of ​​the internal passage, and the materials used. The RTD of an aerosol-generating article may be between 50 millimeters of water (mmH2O) and 140 millimeters of water (mmH2O), between 60 millimeters of water (mmH2O) and 120 millimeters of water (mmH2O), or between 80 millimeters of water (mmH2O) and 100 millimeters of water (mmH2O). The RTD of an article refers to the static pressure difference between one or more holes of the article and the mouth end of the article when penetrated by the internal longitudinal passage under steady-state conditions where the volume flow rate at the mouth end is 17.5 milliliters per second. The RTD of a sample can be measured using the method described in ISO Standard 6565:2002.

[0110] All scientific and technical terms used herein have the meaning commonly used in the art unless otherwise specified. Definitions provided herein are to facilitate understanding of certain terms frequently used herein.

[0111] As used in this specification and the appended claims, the singular forms "a," "an," and "the," encompass plural referent embodiments, unless the content clearly dictates otherwise.

[0112] As used in this specification and the following claims, the term "or" is generally employed in its sense including "and / or" unless the content clearly dictates otherwise.

[0113] As used herein, "having", "including", "comprising", etc. are used in their open sense and generally mean "including but not limited to". It should be understood that "consisting essentially of", "consisting of", etc. are included in "comprising", etc.

[0114] The words "preferred" and "preferably" refer to embodiments of the invention that may provide certain benefits under certain circumstances. However, other embodiments may also be preferred, under the same or other circumstances. In addition, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, and is not intended to exclude other embodiments from the scope of the disclosure, including the claims.

[0115] Figure 1 is a schematic cross-sectional view of an aerosol-generating article.

[0116] Figure 2 is a schematic cross-sectional view of another aerosol-generating article.

[0117] Figure 3 is a schematic cross-sectional view of another aerosol-generating article.

[0118] Figure 4is a schematic cross-sectional view of another aerosol-generating article.

[0119] Figure 5 and Figure 6 is a schematic cross-sectional view of an aerosol generating system.

[0120] Figure 1-4 The aerosol-generating articles depicted in the drawings illustrate one or more embodiments of the aerosol-generating articles or components of the aerosol-generating articles described above. These schematic diagrams are not necessarily drawn to scale and are presented for purposes of illustration and not limitation. The drawings depict one or more aspects described in the present disclosure. However, it should be understood that other aspects not depicted in the drawings fall within the scope and spirit of the present disclosure.

[0121] Figure 1 The aerosol-generating article 10 of the present invention illustrates an aerosol-generating substrate 12 comprising a tobacco rod, a hollow cellulose acetate tube 14, a polylactic acid filter segment 16, and a mouthpiece segment 18 formed of a cellulose acetate material. Each of the four elements is wrapped with a paper layer. In particular, the aerosol-generating substrate 12 is wrapped with a first paper layer 50 as described herein. The four elements are arranged in an end-to-end, longitudinally aligned manner.

[0122] The aerosol-generating substrate 12, the hollow cellulose acetate tube 14, and the polylactic acid filter segment 16 are joined together and surrounded by a second paper layer 20 to form an intermediate article. The mouthpiece segment 18 is joined to the intermediate article with a tipping paper 25 to form the aerosol-generating article 10. The first paper layer 50 and the second paper layer 20 may cooperate to form a wrapper as described herein.

[0123] The aerosol-generating article 10 has a mouth end 22 and an upstream distal end 24 located at the end of the article opposite the mouth end 22 . Figure 1 The aerosol-generating article 10 shown in is particularly suitable for use with an electrically operated aerosol-generating device comprising a heater for heating the aerosol-generating substrate 12 .

[0124] Figure 2 The aerosol-generating article 100 of the invention comprises four elements arranged in a coaxial alignment: a high resistance to draw (RTD) end rod 600 at a distal end 103, a first paper layer 500 surrounding an aerosol-generating substrate 124, a fluid guide 400, and a mouthpiece 170 at a proximal end 101. These four elements are arranged in sequence and surrounded by a second paper layer 110 to form the aerosol-generating article 100. The aerosol-generating article 100 has a proximal or mouth end 101 and a distal end 103 at an end of the aerosol-generating article 100 opposite the proximal end 101. The first paper layer 500 and the second paper layer 110 cooperate to form a wrapper as described herein.

[0125] Figure 3Schematic diagram of an aerosol-generating article 100 illustrates a cross-sectional view of one example of an aerosol-generating article 100 that is suitable for inductive heating and for heating with a blade-shaped heating element.

[0126] The aerosol-generating article 100 comprises, from the proximal end to the distal end, a mouthpiece 170 at the proximal end 101, a fluid guide 400, a cavity 700, a first paper layer 500 surrounding an aerosol-generating substrate 124, and an end rod 600. In this example, the aerosol-generating substrate 124 comprises a gel and a susceptor (not shown). The susceptor in this example is a single aluminum strip centrally located along the longitudinal axis of the aerosol-generating substrate 124. When the distal end 103 of the aerosol-generating article 100 is inserted into the aerosol-generating device 200 (see Figure 6 ), so that the portion of the aerosol generating article 100 is located adjacent to the aerosol generating device 200 (see Figure 6 ) of the induction heating element 230 (see Figure 5 ). When negative pressure is applied at the proximal end 101 of the aerosol-generating article 100, the electromagnetic radiation generated by the inductive heating element 230 will be absorbed by the susceptor and help heat the aerosol-generating substrate 124 in the first paper layer 500, thereby helping to release material from the aerosol-generating substrate 124, such as nicotine entrained in the delivered aerosol. A fluid, such as air, enters the outer longitudinal passage 831 via an aperture (not shown) to transfer to the cavity 700 and then to the aerosol-generating substrate 124, where the fluid mixes with the aerosol-generating substrate 124 and entrains nicotine before returning to the cavity and then passing through the inner longitudinal passage (not shown) of the fluid guide 400 before exiting at the proximal end 101.

[0127] In this example, the first paper layer 500 surrounds the aerosol-generating substrate 124 and the first paper layer 500 is surrounded by the second paper layer 110. The first paper layer 500 and the second paper layer 110 form a wrapper as described herein. The aerosol-generating substrate 124 may include a gel composition.

[0128] Figure 2 and Figure 3 The aerosol generating article 100 shown in FIG. Figure 5 and Figure 6 The aerosol generating device 200 shown in FIG.

[0129] Figure 4The aerosol-generating article 10 of the present invention illustrates an aerosol-generating substrate 12, a hollow cellulose acetate tube 14, a hollow tubular segment 16, and a mouthpiece segment 18. The aerosol-generating substrate 12 is wrapped with a first paper layer 50 as described herein. These four elements are arranged in an end-to-end, longitudinally aligned manner and are surrounded by a second paper layer 20 to form the aerosol-generating article 10. The first paper layer 50 and the second paper layer 20 can cooperate to form a wrapper as described herein.

[0130] The aerosol-generating article 10 has a mouth end 22 and an upstream distal end 24 located at the end of the article opposite the mouth end 22 . Figure 4 The aerosol-generating article 10 shown in is particularly suitable for use with an electrically operated aerosol-generating device comprising a heater for heating the aerosol-generating substrate 12 .

[0131] The aerosol generating substrate 12 has a length of about 12 mm and a diameter of about 7 mm. The aerosol generating substrate 12 is cylindrical in shape and has a substantially circular cross-section. The aerosol generating substrate 12 comprises a gathered sheet of homogenized tobacco material. The sheet of homogenized tobacco material comprises 10% by weight glycerol on a dry weight basis. The hollow cellulose acetate tube 14 has a length of about 8 mm and a thickness of about 1 mm. The mouthpiece segment 18 comprises a filter segment of cellulose acetate tow of 8 deniers per filament and has a length of about 7 mm.

[0132] The hollow tubular segment 14 is provided as a cylindrical tube having a length of about 18 mm and the thickness of the tube wall is about 100 microns. The aerosol-generating article 10 comprises a ventilation zone 26 provided about 5 mm from the upstream end of the mouthpiece segment 18. Thus, the ventilation zone 26 is about 12 mm from the downstream end of the aerosol-generating article and about 13 mm from the upstream end of the hollow tubular segment. Thus, the ventilation zone 26 is about 21 mm from the downstream end of the aerosol-generating substrate 12.

[0133] Figure 5-6 An example of an aerosol generating article 100 and an aerosol generating device 200 is shown. The aerosol generating article 100 has a proximal or oral end 101 and a distal end 103. Figure 5 , the distal end 103 of the aerosol generating article 100 is received in a container 220 of the aerosol generating device 200. The aerosol generating device 200 includes a housing 210 that defines a container 220 that is configured to receive the aerosol generating article 100. The aerosol generating device 200 also includes a heating element 230 that forms a cavity 235 that is configured to receive the aerosol generating article 100, preferably by an interference fit. The heating element 230 may include a resistive heating component. In addition, the device 200 includes a power supply 240 and control electronics 250 that cooperate to control the heating of the heating element 230.

[0134] The heating element 230 can heat the distal end 103 of the aerosol-generating article 100. In this example, the aerosol-generating substrate 124 comprises a gel comprising nicotine. The heating of the aerosol-generating article 100 causes the aerosol-generating substrate 124 to generate a nicotine-containing aerosol, which can be transferred out of the aerosol-generating article 100 at the proximal end 101. The aerosol-generating device 200 comprises a housing 210. Figure 5-6 The exact heating mechanism is not shown.

[0135] In some examples, the heating mechanism may be heating by conduction, wherein heat is transferred from the heating element 230 of the aerosol generating device 200 to the aerosol generating article 100. This may readily occur when the aerosol generating article 100 is positioned in the container 220 and the distal end 103 of the aerosol generating device 200 (which is preferably the end where the aerosol generating substrate 124 is located) and thus the aerosol generating article 100 is in contact with the heating element 230 of the aerosol generating device 200. In a specific example, the heating element comprises a heating blade that protrudes from the aerosol generating device 200 and is adapted to penetrate into the aerosol generating article 100 to be in direct contact with the aerosol generating substrate 124.

[0136] In this example, the heating mechanism is by induction, where when the aerosol-generating article 100 is positioned in the container 220 of the aerosol-generating device 200 , the heating element emits wireless electromagnetic radiation that is absorbed by the tubular element.

[0137] Once the aerosol-generating article 100 is releasably received in the aerosol-generating device 200 and on the heating element 230, the aerosol-generating device 200 is actuated to heat the aerosol-generating substrate 124 to a temperature of about 375 degrees Celsius. When the user draws on the mouth end 101 of the aerosol-generating article 100, the volatile compounds emitted from the aerosol-generating substrate 124 are drawn downstream through the aerosol-generating article 100 and condense to form an aerosol, which is drawn into the user's mouth through the mouthpiece 101 of the aerosol-generating article 100. The wrapper 500, 110 repels aerosol formers and moisture from the aerosol and reduces contamination and weakening of the wrapper 500, 110.

[0138] The first paper layer 50, 500 has a thickness / grammage of about 1.2 microns / gsm or less. Preferably, the first paper layer 50, 500 has a thickness / grammage in the range of about 1.0 microns / gsm to about 1.2 microns / gsm. The first paper layer 50, 500 may have a thickness of less than about 50 microns, or less than about 40 microns. The first paper layer 50, 500 may have a grammage in the range of about 25 gsm to about 45 gsm, or about 35 gsm to about 40 gsm.

[0139] Preferably, the first paper layer 50, 500 has a thickness / grammage of about 1.2 microns / gsm or less and a water contact angle of at least about 30 degrees. The first paper layer 50, 500 may have a water contact angle of at least about 40 degrees, or at least about 45 degrees.

[0140] Preferably, the first paper layer 50, 500 has a thickness / grammage of about 1.2 microns / gsm or less and a CD / MD elongation at break ratio of about 2.5 or less. The first paper layer 50, 500 may have a CD / MD elongation at break ratio of about 2.2 or less, or about 2 or less.

[0141] Preferably, the first paper layer 50, 500 has a thickness / grammage of about 1.2 micrometers / gsm or less and has a negative result for at least one sample of the test oil of the method Tappi 559cm-02 Classic Method 2002. The first paper layer 50, 500 may have a negative result for at least five samples of the test oil of the method Tappi 559cm-02 Classic Method 2002, or for all ten samples of the test oil.

[0142] Preferably, the packaging material comprises a first paper layer 50, 500 and a second paper layer 20, 110, wherein the first paper layer 50, 500 has a first thickness / grammage value per square meter, the second paper layer 20, 110 has a second thickness / grammage value per square meter, and the first thickness / grammage value per square meter is less than the second thickness / grammage value per square meter. The first thickness / grammage value per square meter may be less than 1.2 microns / gsm and the packaging material may have a total thickness of less than about 80 microns.

[0143] Preferably, the first paper layer 50, 500 comprises PVOH (polyvinyl alcohol) or silicon. The first paper layer 50, 500 may comprise a surface treatment agent, wherein the surface treatment agent comprises PVOH or silicon. The addition of PVOH (polyvinyl alcohol) or silicon may improve the grease barrier properties of the packaging.

[0144] Preferably, the second paper layer 20, 110 comprises PVOH (polyvinyl alcohol) or silicon. The second paper layer 20, 110 may comprise a surface treatment agent, wherein the surface treatment agent comprises PVOH or silicon. The addition of PVOH (polyvinyl alcohol) or silicon may improve the grease barrier properties of the packaging.

[0145] The above exemplary embodiments are not limiting. Other embodiments consistent with the above exemplary embodiments will be apparent to those skilled in the art.

[0146] Specifically, the present invention also relates to the following items:

[0147] 1. An aerosol-generating article, comprising:

[0148] an aerosol-generating substrate comprising nicotine and at least about 10% of an aerosol former, the aerosol former comprising glycerin; and

[0149] A wrapper is disposed around and in contact with the aerosol-generating substrate, the wrapper comprising a paper layer having a thickness / grammage of about 1.2 microns / gsm or less.

[0150] 2. An aerosol-generating article according to claim 1, wherein the paper layer has a thickness / grammage in the range of about 1.0 microns / gsm to about 1.2 microns / gsm.

[0151] 3. An aerosol-generating article according to any preceding claim, wherein the paper layer has a thickness of less than about 50 microns, or less than about 40 microns.

[0152] 4. An aerosol-generating article according to any preceding claim, wherein the paper layer has a grammage in the range of about 25 gsm to about 45 gsm, or about 35 gsm to about 40 gsm.

[0153] 5. An aerosol-generating article according to any preceding claim, wherein the paper layer comprises PVOH or silicon.

[0154] 6. An aerosol-generating article according to any preceding claim, wherein the paper layer comprises a surface treatment comprising PVOH or silicon.

[0155] 7. An aerosol-generating article according to any preceding claim, wherein the paper layer comprises PVOH.

[0156] 8. An aerosol-generating article according to any preceding claim, wherein the paper layer comprises silicon.

[0157] 9. An aerosol-generating article according to any preceding claim, wherein the aerosol-generating substrate comprises a gel composition.

[0158] 10. An aerosol-generating article according to claim 9, wherein the gel composition comprises a major portion of glycerol.

[0159] 11. An aerosol-generating article according to claim 10, wherein the gel composition comprises xanthan gum.

[0160] 12. An aerosol-generating article according to any preceding claim, wherein the aerosol-generating substrate comprises homogenised tobacco material.

[0161] 13. An aerosol-generating article according to claim 12, wherein the homogenized tobacco material comprises tobacco material, from about 1% to about 5% of a binder and from about 5% to about 30% of an aerosol former by dry weight.

[0162] 14. An aerosol-generating article according to any preceding claim, wherein the aerosol-generating substrate comprises a metallic induction heating element.

[0163] 15. An aerosol-generating article according to any preceding claim, wherein the aerosol-generating substrate comprises a plurality of metallic induction heating elements.

Claims

1. An aerosol-generating article, comprising: an aerosol-generating substrate comprising nicotine and at least about 10% of an aerosol former, the aerosol former comprising glycerin; and A wrapper disposed around the aerosol-generating substrate, wherein the wrapper comprises a paper layer having a thickness / grammage of about 1.2 microns / gsm or less, and wherein the paper layer comprises a surface treatment comprising PVOH or silicone.

2. An aerosol-generating article according to claim 1, wherein the paper layer has a thickness / grammage in the range of about 1.0 microns / gsm to about 1.2 microns / gsm.

3. An aerosol-generating article according to any preceding claim, wherein the paper layer has a thickness of less than about 50 microns, or less than about 40 microns.

4. An aerosol-generating article according to any preceding claim, wherein the paper layer has a grammage in the range of about 25 gsm to about 45 gsm, or about 35 gsm to about 40 gsm.

5. An aerosol-generating article according to any preceding claim, wherein the paper layer comprises PVOH.

6. An aerosol-generating article according to any preceding claim, wherein the paper layer comprises silicone.

7. An aerosol-generating article according to any preceding claim, wherein the aerosol-generating substrate comprises a gel composition.

8. An aerosol-generating article according to claim 7, wherein the gel composition comprises glycerol in a majority amount.

9. An aerosol-generating article according to claim 8, wherein the gel composition comprises xanthan gum.

10. An aerosol-generating article according to any preceding claim, wherein the aerosol-generating substrate comprises homogenised tobacco material.

11. An aerosol-generating article according to claim 10, wherein the homogenized tobacco material comprises tobacco material, from about 1% to about 5% of a binder and from about 5% to about 30% of an aerosol former by dry weight.

12. An aerosol-generating article according to any preceding claim, wherein the aerosol-generating substrate comprises a metallic induction heating element.

13. An aerosol-generating article according to any preceding claim, wherein the aerosol-generating substrate comprises a plurality of metallic induction heating elements.

14. An aerosol-generating article according to any preceding claim, wherein the wrapper comprises a first paper layer and a second paper layer, wherein only one of the first paper layer or the second paper layer comprises a surface treatment comprising PVOH or silicone.

15. An aerosol-generating article according to any preceding claim, wherein the wrapper comprises a first paper layer and a second paper layer, wherein both the first paper layer and the second paper layer comprise a surface treatment comprising PVOH or silicone.

16. An aerosol-generating article according to claim 14, wherein the second paper layer separates the first paper layer from the aerosol-generating substrate, and only the first paper layer comprises a surface treatment comprising PVOH or silicone.

17. An aerosol-generating article according to claim 14, wherein the first paper layer separates the second paper layer from the aerosol-generating substrate, and only the first paper layer comprises a surface treatment comprising PVOH or silicone.

18. An aerosol-generating article according to any preceding claim, further comprising a mouthpiece segment or a hollow tube segment arranged end-to-end longitudinally aligned with the aerosol-generating substrate, and the wrapper surrounds both at least one of the mouthpiece segment or the hollow tube segment and the aerosol-generating substrate.

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