Stable packaging for aerosol-generating articles

Abstract

A wrapper (50) for use in an aerosol-generating article (10) is provided. The paper wrapper has a low ratio of elongation at break and is used with an aerosol-generating substrate (20). The aerosol-generating article comprises an aerosol-generating substrate comprising nicotine and at least 10% of an aerosol former, the aerosol former comprising glycerol. The wrapper is disposed around and in contact with the aerosol-generating substrate. The wrapper comprises a paper layer having a ratio of cross-machine direction / machine direction (CD / MD) elongation at break of 2.5 or less.

Description

[0001] This application is a divisional application of Chinese invention patent application filed on June 8, 2020, with application number 202080036428.5 and invention title "Stable Packaging Material for Aerosol Generating Articles".

[0002] This disclosure relates to a packaging material for use in aerosol-generating articles, wherein the paper packaging material has a low elongation at break ratio and can be used with an aerosol-generating matrix.

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

[0004] Paper used to encapsulate the aerosol-generating matrix can absorb aerosol-forming agents, water, and other liquid compounds found in the mainstream flue gas or aerosols passing through the aerosol-generating article, or moisture or humidity around the paper. The absorbed liquids can contaminate or weaken the paper and adversely affect the appearance and structural integrity of the aerosol-generating article. Heated aerosol-generating articles are particularly prone to becoming wet and breaking due to the high levels of aerosol-forming agents in their aerosol-generating matrix. Heated aerosol-generating articles will swell particularly easily when aerosol components are absorbed by the packaging, making them difficult to remove from the heating device. They will also be particularly prone to breakage when tightly received and then removed from the heating device.

[0005] The aim is to provide a visually and mechanically stable encapsulated aerosol-generating matrix, particularly for aerosol-generating articles containing high levels of liquid or aerosol-forming agents.

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

[0007] It is desirable to provide an aerosol-generating article comprising a packaging that provides an oil barrier against oily compounds contained in an aerosol-generating matrix.

[0008] It is also expected that the packaging will not affect the taste of aerosols generated from aerosol-generating products.

[0009] It is also expected that the packaging will not easily ignite when near the heating element.

[0010] The object of this invention is to at least partially address one or more of the desired technical benefits mentioned above.

[0011] According to this disclosure, an aerosol-generating article is provided, comprising an aerosol-generating matrix and a packaging material disposed around the aerosol-generating matrix, wherein the aerosol-generating matrix contains nicotine. The packaging material comprises a paper layer having a CD / MD breaking elongation ratio of 2.5 or less.

[0012] According to this disclosure, an aerosol-generating article is provided, comprising an aerosol-generating matrix and a package disposed around and in contact with the aerosol-generating matrix, wherein the aerosol-generating matrix comprises nicotine and at least about 10% of an aerosol-forming agent, the aerosol-forming agent comprising glycerin. The package comprises a paper layer having a transverse / longitudinal (CD / MD) breaking elongation ratio of about 2.5 or less.

[0013] The term "MD" refers to the longitudinal direction of the packaging. The longitudinal direction is the direction in which the paper stock flows into and through the paper machine. It is also the circumferential direction of the paper roll wound from the paper machine. The longitudinal direction can also be referred to as the grain direction.

[0014] The term "CD" refers to the transverse direction of the packaging. The transverse direction of the packaging is the direction within the plane of the packaging. The transverse direction of the packaging is orthogonal to the longitudinal direction of the packaging.

[0015] According to this disclosure, an aerosol generating article is provided. The aerosol generating article may include an aerosol generating matrix. The aerosol generating matrix may include a packaging material. The packaging material may be disposed around the aerosol generating matrix. The packaging material includes a paper layer having a CD / MD breaking elongation ratio of about 2.5 or less.

[0016] Preferably, the paper layer has a CD / MD breaking elongation ratio of about 2.2 or less. Preferably, the paper layer has a CD / MD breaking elongation ratio of about 2 or less. Preferably, the paper layer has a CD / MD breaking elongation ratio in the range of about 1.8 to about 2.2.

[0017] Preferably, the paper layer has a thickness / gramm weight in the range of about 1.0 micrometers / gsm to about 1.2 micrometers / gsm. The paper layer may have a thickness of less than about 50 micrometers or less than about 40 micrometers. The packaging comprises a paper layer having a gramm weight in the range of about 25 gsm to about 45 gsm or about 35 gsm to about 40 gsm. Preferably, the paper layer has a gramm weight in the range of about 25 gsm to about 45 gsm and a thickness in the range of about 35 micrometers to about 50 micrometers.

[0018] Preferably, the paper layer has a CD / MD breaking elongation ratio of about 2.5 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.

[0019] Preferably, the packaging comprises a paper layer having a CD / MD breaking elongation ratio of about 2.5 or less and a negative result for at least one reagent oil sample of Method Tappi 559cm-02 Classic Method 2002. The paper layer may have a negative result for at least five, or all ten, reagent oil samples of Method Tappi 559cm-02 Classic Method 2002.

[0020] Preferably, the packaging comprises two paper layers, wherein the first paper layer has a first CD / MD breaking elongation ratio of about 2.5 or less and the second paper layer has a second CD / MD breaking elongation ratio of about 2.5 or less. The packaging may have a total thickness of less than about 80 micrometers.

[0021] Preferably, the packaging material contains PVOH (polyvinyl alcohol) or silicone. The paper layer may contain a surface treatment agent containing PVOH or silicone. The addition of PVOH or silicone can improve the grease barrier properties of the packaging material.

[0022] The term "silicon" refers to siloxanes. Silicon or siloxanes preferably contain polydimethylsiloxane.

[0023] Preferably, the aerosol generating matrix may comprise homogenized tobacco material. The homogenized tobacco material may comprise tobacco material, about 1% to about 5% by dry weight of a binder, and about 5% to about 30% by dry weight of an aerosol forming agent.

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

[0025] Preferably, the aerosol generating matrix may include a metal induction heating element. The metal induction heating element may include multiple metal induction heating elements. The metal induction heating element may include a metal induction heating ring element.

[0026] Packaging materials can be formed from a single paper layer. Packaging materials can be formed from two paper layers. Packaging materials can be formed from more than two paper layers.

[0027] Preferably, the packaging 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 of the aerosol-generating matrix. The packaging preferably covers the entire aerosol-generating matrix and does not extend beyond it.

[0028] When the packaging has two or more paper layers, the first paper layer may have the unique properties described herein, while the second paper layer may be considered a conventional paper layer. The second paper layer is preferably 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 matrix.

[0029] When the packaging 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 packaging may have the unique properties described herein. In particular, one or two paper layers forming the packaging may contain PVOH (polyvinyl alcohol) or silicone. One or two paper layers forming the packaging may contain a surface treatment agent containing PVOH or silicone.

[0030] Advantageously, aerosol-generating articles, including the packaging described herein, can reduce wetting and absorption of water, aerosol forming agents, or oils in the flue gas or aerosol passing through the aerosol-generating article. Therefore, even when the aerosol-generating matrix contains high levels of aerosol forming agents, swelling, visible contamination, and physical attenuation of the packaging portion of the aerosol-generating article can be reduced.

[0031] Advantageously, the aerosol-generating article provides a visually and mechanically stable encapsulated aerosol-generating matrix that avoids swelling. This is particularly suitable for heated, non-combustion aerosol-generating articles that can be inserted into a heating device. The aerosol-generating article packaging resists combustion when near a heating element, thus allowing the induction heating element to be integrated throughout the aerosol-generating matrix.

[0032] Paper packaging with a CD / MD breaking elongation ratio of 2.5 or less exhibits reduced paper swelling. Preferably, paper packaging with a CD / MD breaking elongation ratio in the range of about 1.8 to about 2.2 or about 2 or less exhibits reduced paper swelling.

[0033] The term "aerosol-generating article" is used herein to refer to an article in which an aerosol-generating matrix is ​​heated to generate and deliver an inhalable aerosol to a consumer. As used herein, the term "aerosol-generating matrix" refers to a matrix capable of releasing volatile compounds upon heating to generate an aerosol.

[0034] A conventional cigarette is ignited when a user applies a flame to one end and inhales air through the other end. The localized heat provided by the flame and oxygen in the inhaled air ignites the cigarette end, and the resulting combustion produces inhalable smoke. In contrast, in heated aerosol-generating articles, aerosols are generated by heating a flavor-generating matrix such as tobacco. Known heated aerosol-generating articles include, for example, electrically heated aerosol-generating articles and aerosol-generating articles in which aerosols are generated by heat transfer from a combustible fuel element or heat source to a physically separate aerosol-forming matrix. For example, the aerosol-generating articles according to this disclosure find particular application in aerosol-generating systems that include an electrically heated aerosol-generating device having internal heater blades adapted to be inserted into strips of an aerosol-generating matrix. This type of aerosol-generating article is described in the prior art, for example in EP 0822670.

[0035] As used herein, the term "aerosol generating apparatus" refers to an apparatus containing a heater element that interacts with an aerosol generating matrix of an aerosol generating article to generate an aerosol.

[0036] As used herein, the term "aerosol generation system" refers to the combination of an aerosol generation device and an aerosol-generated product.

[0037] The term "aerosol-generating matrix" refers to a substance capable of generating or releasing aerosols. An aerosol-generating matrix can be a solid, paste, gel, slurry, liquid, or any combination thereof comprising solid, paste, gel, slurry, and liquid compounds. Preferably, the aerosol-generating matrix is ​​a solid or gel composition. The aerosol-generating matrix may preferably contain nicotine.

[0038] Aerosol-generating articles may include an aerosol-generating matrix and a mouthpiece. The mouthpiece may include a filter. Tip-off packaging may attach the filter to the aerosol-generating matrix.

[0039] The aerosol generating matrix can be a solid composition. This composition may contain plant-based materials. The aerosol generating matrix may include tobacco, and preferably the tobacco contains volatile tobacco flavor compounds that are released from the aerosol generating matrix upon heating. The aerosol generating matrix may contain homogenized tobacco material, an aerosol forming agent, and a binder.

[0040] Nicotine may be present in the aerosol-generating matrix in the range of about 0.5 to about 10% by weight, or about 0.5 to about 5% by weight. Preferably, the aerosol-generating matrix may contain about 1 to about 3% by weight, or about 1.5 to about 2.5% by weight, or about 2% by weight.

[0041] The aerosol generating matrix may contain edible flavorings. Plant materials provide edible flavorings that impart a certain flavor to the aerosols generated from aerosol generating articles. Edible flavorings are any natural or artificial compounds that affect the sensory quality of the aerosol. Non-limiting examples of sources of edible flavorings include peppermint such as peppermint and spearmint, coffee, tea, cinnamon, cloves, cocoa, vanilla, eucalyptus, geranium, agave, and juniper; and combinations thereof.

[0042] The aerosol-generating matrix may contain essential oils. Essential oils can provide edible flavorings that impart a certain taste to the aerosols generated from the aerosol-generating product. Suitable essential oils include, but are not limited to, eugenol, peppermint oil, and spearmint oil. Eugenol is a preferred essential oil. The essential oil may be present in the aerosol-generating matrix in an amount of at least about 0.1% by weight, at least about 0.5% by weight, or at least about 1% by weight. The essential oil may be present in the aerosol-generating matrix in the 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.

[0043] Aerosol-generating matrices may include gel compositions. The term "gel" refers to a solid at room temperature. In this context, "solid" 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 diluted cross-linked system that does not exhibit flowability at steady state. By weight, gels may be primarily liquid, but they behave similarly to solids due to the three-dimensional cross-linked network within the liquid. It is the cross-linking within the fluid that gives the gel its structure (stiffness). Thus, a gel can be a dispersion of liquid molecules within a solid, where liquid particles are dispersed in a solid medium.

[0044] A gel composition may comprise a gelling agent forming a solid medium, an aerosol-forming agent such as glycerol dispersed in the solid medium, and nicotine dispersed in glycerol. The composition forms a stable gel phase. A gel composition may comprise at least two gelling agents forming a solid medium, glycerol dispersed in the solid medium, and nicotine dispersed in glycerol. The composition forms a stable gel phase. A gel composition may comprise a thickener and a gelling agent forming a solid medium, glycerol dispersed in the solid medium, and nicotine dispersed in glycerol. The composition forms a stable gel phase. A gel composition may comprise nicotine, an aerosol-forming agent, a thickener, a hydrogen-bonded crosslinking gelling agent, and an ionic crosslinking gelling agent. The gel composition may also comprise a divalent cation.

[0045] The term "thickening agent" refers to a compound that, when uniformly added in an amount of 0.3% by weight to a mixture of 50% by weight water / 50% by weight glycerol at 25°C, increases viscosity without causing gel formation, wherein the mixture retains or preserves fluidity. Preferably, the thickening agent refers to a compound that, when uniformly added in an amount of 0.3% by weight to a mixture of 50% by weight water / 50% by weight glycerol at 25°C, increases viscosity within 0.1 seconds. -1 The viscosity increases to at least 50 cP, preferably at least 200 cP, preferably at least 500 cP, and preferably at least 1000 cP at a certain shear rate without causing gel formation, and the mixture retains or preserves fluidity. Preferably, the thickener refers to a compound that, when uniformly added in an amount of 0.3 wt% to a mixture of 50 wt% water / 50 wt% glycerol at 25°C, increases viscosity to at least 50 cP, preferably at least 200 cP, preferably at least 500 cP, and preferably at least 1000 cP without causing gel formation. -1 A compound that increases viscosity to at least 2, 5, 10, or 100 times higher than before addition at a certain shear rate without causing gel formation, wherein the mixture retains or preserves fluid.

[0046] The viscosity values ​​described herein can be measured using a Brookfield RVT viscometer at 25°C by rotating the disc-type RV#2 spindle at a speed of 6 revolutions per minute (rpm).

[0047] The term "gelling agent" refers to a compound that, when uniformly added in an amount of about 0.3% by weight to a mixture of 50% by weight water and 50% by weight glycerol, forms a solid medium or carrier matrix that results in gelation. Gelling agents include, but are not limited to, hydrogen-bonded crosslinking gelling agents and ionic crosslinking gelling agents.

[0048] The term "hydrogen-bonded crosslinking gelling agent" refers to a gelling agent that forms non-covalent or physical crosslinking bonds via hydrogen bonds. Hydrogen bonds are a type of electrostatic dipole-dipole attraction between molecules, rather than covalent bonds with hydrogen atoms. They arise from the attractive force between a hydrogen atom covalently bonded to a highly negatively charged atom (such as N, O, or F) and another highly negatively charged atom.

[0049] The term "ionic crosslinking gelling agent" refers to a gelling agent that forms non-covalent or physical crosslinking bonds through ionic bonds. Ionic crosslinking involves the association of polymer chains through non-covalent interactions. A crosslinked network is formed when multivalent molecules with opposite charges attract each other electrostatically to form a crosslinked polymer network.

[0050] The gel composition contains an aerosol forming agent. Ideally, the aerosol forming agent is substantially resistant to thermal degradation at the operating temperature of the associated aerosol generating device. Suitable aerosol forming agents include, but are not limited to: polyols such as triethylene glycol, 1,3-butanediol, 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 dodecanoate and dimethyl tetradecanoate. The polyol or mixture thereof may be one or more of triethylene glycol, 1,3-butanediol, glycerol (glycerol or propane-1,2,3-triol), or polyethylene glycol. Glycerol is preferred as the aerosol forming agent.

[0051] The gel composition may contain a majority aerosol forming agent such as glycerol. The gel composition may contain a mixture of water and glycerol, wherein glycerol forms the majority (by weight) of the gel composition. Glycerol may form at least about 50% by weight of the gel composition. Glycerol may form at least about 60%, or about 65%, or about 70% by weight of the gel composition. Glycerol may form about 70% to about 80% by weight of the gel composition. Glycerol may form about 70% to about 75% by weight of the gel composition.

[0052] The gel composition preferably contains no water or contains a small amount of water. When the gel composition contains no water or contains a small amount of water, it may contain higher levels of other compounds such as aerosol forming agents, gelling agents, thickeners, and nicotine. Furthermore, gel compositions containing no water or containing a small amount of water are easier to vaporize and require less energy to vaporize. The aerosol formed from a gel composition containing no water or containing a small amount of water may 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, and more preferably less than about 25% by weight of water. The gel composition may contain less than about 20% by weight, less than about 15% by weight, 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, it 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 contains water in the range of about 15% to about 25% by weight.

[0053] The gel composition may include a gelling agent, which is a hydrogen-bonded crosslinking gelling agent or an ionic crosslinking gelling agent. The gel composition may also include a thickener. The gelling agent can form a solid medium in which an aerosol forming agent can be dispersed. The gelling agent can form a solid medium in which an aerosol forming agent and water can be dispersed. The thickener, combined with both hydrogen-bonded crosslinking gelling agents and ionic crosslinking gelling agents, appears to unexpectedly support the solid medium and retain the gel composition, even when the gel composition contains high levels of glycerol.

[0054] The gel composition may contain a gelling agent in the range of about 0.4% to about 10% by weight. Preferably, the composition may contain a gelling agent in the range of about 0.5% to about 8% by weight. Preferably, the composition may contain a gelling agent in the range of about 1% to about 6% by weight. Preferably, the composition may contain a gelling agent in the range of about 2% to about 4% by weight. Preferably, the composition may contain a gelling agent in the range of about 2% to about 3% by weight.

[0055] The gel composition may contain a tackifier in the range of about 0.2% by weight to about 5% by weight. Preferably, the tackifier is in the range of about 0.5% by weight to about 3% by weight. Preferably, the tackifier is in the range of about 0.5% by weight to about 2% by weight. Preferably, the tackifier is in the range of about 1% by weight to about 2% by weight.

[0056] The gel composition may contain a tackifier, a hydrogen-bonded crosslinking gelling agent, and an ionic crosslinking gelling agent present in the gel composition in a total amount of about 1% to about 8% by weight. Preferably, the gel composition may contain a tackifier, a hydrogen-bonded crosslinking gelling agent, and an ionic crosslinking gelling agent present in the gel composition in a total amount of about 2% to about 6% by weight. Preferably, the gel composition may contain a tackifier, a hydrogen-bonded crosslinking gelling agent, and an ionic crosslinking gelling agent present in the gel composition in a total amount of about 3% to about 5% by weight.

[0057] The gel composition may contain a tackifier, a hydrogen-bonded crosslinking gelling agent, and an ionic crosslinking gelling agent, each independently present in the gel composition in the range of about 0.3% to about 3% by weight. Preferably, the gel composition may contain a tackifier, a hydrogen-bonded crosslinking gelling agent, and an ionic crosslinking gelling agent, each independently present in the gel composition in the range of about 0.5% to about 2% by weight. Preferably, the gel composition may contain a tackifier, a hydrogen-bonded crosslinking gelling agent, and an ionic crosslinking gelling agent, each independently present in the gel composition in the range of about 1% to about 2% by weight.

[0058] The thickener may contain one or more of xanthan gum, carboxymethyl cellulose, microcrystalline cellulose, methyl cellulose, gum arabic, guar gum, λ-carrageenan, or starch. Xanthan gum is a preferred thickener.

[0059] The gel composition may contain a tackifier such as xanthan gum in the range of about 0.2 wt% to about 5 wt%. Preferably, the xanthan gum is in the range of about 0.5 wt% to about 3 wt%. Preferably, the xanthan gum is in the range of about 0.5 wt% to about 2 wt%. Preferably, the xanthan gum is in the range of about 1 wt% to about 2 wt%.

[0060] The hydrogen-bonded crosslinking gelling agent may contain one or more of galactomannan, gelatin, agarose, konjac gum, or agar. Agar is preferably included in the hydrogen-bonded crosslinking gelling agent.

[0061] The gel composition may contain a hydrogen-bonded crosslinking gelling agent, such as agar, in the range of about 0.3% to about 5% by weight. Preferably, the composition may contain a hydrogen-bonded crosslinking gelling agent in the range of about 0.5% to about 3% by weight. Preferably, the composition may contain a hydrogen-bonded crosslinking gelling agent in the range of about 1% to about 2% by weight.

[0062] Ionic crosslinking gelling agents may include low-acyl gellan gum, pectin, K carrageenan, I carrageenan, or alginate. Ionic crosslinking gelling agents may preferably include low-acyl gellan gum.

[0063] The gel composition may contain an ionic crosslinking gelling agent, such as a low-acyl gellan gum, in the range of about 0.3% to about 5% by weight. Preferably, the composition may contain an ionic crosslinking gelling agent in the range of about 0.5% to about 3% by weight. Preferably, the composition may contain an ionic crosslinking gelling agent in the range of about 1% to about 2% by weight.

[0064] The gel composition may also contain divalent cations. Preferably, the divalent cations may include calcium ions, such as calcium lactate in solution. For example, divalent cations (such as calcium ions) can help gel formation in compositions containing gelling agents such as ionic crosslinking gelling agents. Ionic effects can aid gel formation. Divalent cations may be present in the gel composition in the range of about 0.1% to about 1% by weight, or about 0.5% by weight.

[0065] The gel composition may also contain an acid. The acid may contain a carboxylic acid. The carboxylic acid may contain a ketone group. Preferably, the carboxylic acid may contain 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. Carboxylic acids can help with gel formation. During storage, carboxylic acids can reduce changes in nicotine concentration within the gel composition.

[0066] The gel composition may contain a carboxylic acid, such as lactic acid, in the range of about 0.1 wt% to about 5 wt%. Preferably, the carboxylic acid may be in the range of about 0.5 wt% to about 3 wt%. Preferably, the carboxylic acid may be in the range of about 0.5 wt% to about 2 wt%. Preferably, the carboxylic acid may be in the range of about 1 wt% to about 2 wt%.

[0067] Nicotine is contained in the gel composition. Nicotine may be added to the composition in free alkali form or salt form. The gel composition may contain about 0.5% to about 10% by weight of nicotine, or about 0.5% to about 5% by weight of nicotine. Preferably, the gel composition may contain about 1% to about 3% by weight of nicotine, or about 1.5% 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 of the gel formulation. In some aspects, water may be the most volatile component of the gel formulation, and the nicotine component of the gel formulation may be the second most volatile component of the gel formulation.

[0068] An aerosol generation system may include: a heat source; an aerosol generation matrix; at least one air inlet downstream of the aerosol generation matrix; and an airflow path extending between the at least one air inlet and the opening of an article. The heat source is preferably upstream of the aerosol generation matrix. The heat source may be integrated with the aerosol generation apparatus, and the combustible aerosol-generating article may be releasably contained within the aerosol generation apparatus.

[0069] The heat source can be a combustible heat source, a chemical heat source, an electric heat source, a heat sink, or any combination thereof. The heat source can be an electric heat source, preferably shaped like blades that can be inserted into the aerosol-generating matrix. Alternatively, the heat source can be configured to surround the aerosol-generating matrix and thus can be in the form of a hollow cylinder, or any other suitable form. Alternatively, the heat source can be a combustible heat source. As used herein, a combustible heat source is one that generates heat through self-combustion during use, unlike cigarettes, cigars, or cigarillos, which involve burning the aerosol-generating matrix. The combustible heat source may contain 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.

[0070] The aerosol generating matrix may include an induction heating element or sensor, or multiple induction heating elements or sensors. The induction heating element or sensor is heated in the presence of an alternating or fluctuating electromagnetic field. When heating is achieved by induction heating, the fluctuating electromagnetic field is transmitted through the aerosol generating article to the induction heating element or sensor, causing the sensor or induction heating element to convert the fluctuating field into heat energy, thereby heating the aerosol generating matrix.

[0071] The induction heating element or sensor can be formed of any material that can be inductively heated to a temperature sufficient to generate aerosols from the aerosol-generating matrix. The induction heating element or sensor may contain metal or carbon. Preferred induction heating elements or sensors may contain ferromagnetic materials, such as ferritic iron, ferromagnetic steel, or stainless steel. Induction heating elements or sensors may contain aluminum. Induction heating elements or sensors may be formed of 400 series stainless steel, such as grade 410, 420, or 430 stainless steel. Different materials will dissipate different amounts of energy when placed in an electromagnetic field with similar frequency and field strength values. Preferably, the induction heating element or sensor is heated to a temperature exceeding 250 degrees Celsius. However, preferably, the induction heating element or sensor is heated to below 350 degrees Celsius to prevent combustion of materials in contact with the sensor.

[0072] The induction heating element or sensor can be located near the packaging material of the aerosol-generating matrix, as the packaging material described herein is advantageously resistant to combustion.

[0073] The term "mouthpiece" is used herein to refer to the portion of an aerosol-generating article designed to come into contact with a consumer's mouth. A mouthpiece may be a portion of an aerosol-generating article that may include a filter, or in some cases, a mouthpiece may be defined by the extent of a tip-on package. In other cases, a mouthpiece may be defined as a portion of an aerosol-generating article that extends approximately 40 mm or approximately 30 mm from the mouth end of the aerosol-generating article.

[0074] The terms “upstream” and “downstream” refer to the relative positions of the components of the aerosol-generating article with respect to the direction of the aerosol as it is drawn from the aerosol-generating matrix and passes through the mouthpiece.

[0075] The terms "packaging" or "paper packaging" are interchangeable and refer to one or more layers of paper-based wrapping material that surrounds or retains the shape of the aerosol-generating matrix to contain it or maintain the shape of the aerosol-generating article. The packaging will reduce spotting on the outer surface of the aerosol-generating article. Preferably, the packaging is in contact with the aerosol-generating matrix.

[0076] The term "hydrophobic" refers to a surface that exhibits water-repellent properties. A useful method for determining this is to measure the water contact angle. The "water contact angle" is the angle conventionally measured by the liquid at the point where a liquid / vapor interface encounters a solid surface. It quantifies the wettability of a liquid on a solid surface using Young's equation. Hydrophobicity, or the water contact angle, can be determined using the TAPPI T558 test method, with results presented as interfacial contact angles and reported in degrees, ranging from near zero to near 180 degrees.

[0077] The elongation at break value is reported as a percentage calculated by dividing the elongation (mm) at break by the total distance the paper was stretched. The elongation at break value is based on ISO 1924-2 – Paper and paperboard – Determination of tensile properties – Part 2: Measurement by constant rate tensile method.

[0078] The test method for elongation at break, ISO 1924-2, is as follows: After conditioning at 22±2°C and 60±5% RH for at least 24 hours, a test specimen of a given size (15±0.1 mm wide, 250 mm long, cut in the longitudinal or transverse direction of the paper) is stretched at a constant elongation rate (8 mm / min) using a tensile testing instrument (a general-purpose tensile / compression testing machine, Instron 5566 or equivalent, with an Instron 100N tensile load cell or equivalent) until it breaks. The force / elongation curve is recorded using Merlin software or equivalent, and the elongation at break (%) is calculated by dividing the elongation (mm) at break by the distance between the pneumatic clamps (180±0.5 mm).

[0079] This disclosure relates to a paper packaging for use in an aerosol-generating article, wherein the packaging comprises a paper layer having a low CD / MD breaking elongation ratio and is usable with an aerosol-generating matrix. According to this disclosure, an aerosol-generating article is provided comprising an aerosol-generating matrix and packaging disposed around the aerosol-generating matrix, wherein the aerosol-generating matrix contains nicotine. The packaging comprises a paper layer having a low CD / MD breaking elongation ratio, preferably about 2.5 or less, or preferably about 2.2 or less, or preferably about 2 or less.

[0080] The elongation at break of the packaging in the transverse (CD) direction can range from about 3% to about 5%. The elongation at break of the packaging in the longitudinal (MD) direction can range from about 1% to about 3%.

[0081] The packaging comprises a paper layer having a thickness / grammage in the range of about 0.8 micrometers / gsm to about 1.2 micrometers / gsm. The paper layer may have a thickness / grammage in the range of about 1.0 micrometers / gsm to about 1.2 micrometers / gsm. The paper layer may have a thickness / grammage of about 1.0 micrometers / gsm. The paper layer may have a thickness / grammage of about 0.9 micrometers / gsm. The paper layer may have a thickness / grammage of about 1.0 micrometers / gsm. The paper layer may have a thickness / grammage of about 1.1 micrometers / gsm. The paper layer may have a thickness / grammage of about 1.2 micrometers / gsm.

[0082] The paper layer may have a thickness of less than about 50 micrometers or less than about 40 micrometers. The paper layer may have a thickness ranging from about 10 micrometers to about 50 micrometers. The paper layer may have a thickness ranging from about 20 micrometers to about 50 micrometers. The paper layer may have a thickness ranging from about 30 micrometers to about 50 micrometers. The paper layer may have a thickness ranging from about 35 micrometers to about 40 micrometers. The paper layer may have a thickness ranging from about 40 micrometers to about 50 micrometers.

[0083] The paper layer may have a basis weight per square meter (gsm) ranging from about 25 gsm to about 45 gsm. The paper layer may have a basis weight per square meter ranging from about 30 gsm to about 45 gsm. The paper layer may have a basis weight per square meter ranging from about 35 gsm to about 45 gsm. The paper layer may have a basis weight per square meter ranging from about 35 gsm to about 40 gsm.

[0084] In one embodiment, the paper layer has a breaking elongation of about 4% in the transverse (CD) direction and about 2% in the longitudinal (MD) direction.

[0085] In one embodiment, the paper layer has a breaking elongation of about 4% in the transverse (CD) direction and about 2% in the longitudinal (MD) direction. The paper layer has a basis weight of about 35 gsm to about 40 gsm and a thickness of about 35 micrometers to about 45 micrometers.

[0086] In one embodiment, the paper layer has an elongation at break of about 4% in the transverse direction (CD) and about 2% in the longitudinal direction (MD). The paper layer has a basis weight of about 35 gsm to about 40 gsm and a thickness of about 35 micrometers to about 45 micrometers. The paper layer has a water contact angle of about 35 degrees to about 50 degrees.

[0087] In one embodiment, the paper layer has a low CD / MD breaking elongation ratio of about 2, a water contact angle of about 38 degrees, a basis weight of about 35 gsm per square meter, and a thickness of about 37 micrometers.

[0088] Preferably, the paper layer comprises PVOH (polyvinyl alcohol) or silicone. 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 both the inner and outer surfaces of the paper layer of the aerosol-generating article. PVOH may be disposed on both the inner and outer surfaces of the paper layer of the aerosol-generating article and form a layer.

[0089] The paper layer may contain a surface treatment agent comprising PVOH or silicone. The paper layer may contain a surface treatment agent comprising PVOH. The paper layer may contain a surface treatment agent comprising silicone. 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 silicone can improve the grease barrier properties of the paper layer.

[0090] The aerosol-generating matrix may include a gel composition. The gel composition may contain a majority aerosol-forming agent such as glycerol. The gel composition may contain 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-bonded crosslinking gelling agent, at least about 0.2% by weight of an ionic crosslinking gelling agent, and at least about 0.2% by weight of a thickener. The gel composition may contain xanthan gum.

[0091] The aerosol generating matrix may contain homogenized tobacco material. The homogenized tobacco material may contain tobacco material, about 1% to about 5% of binder by dry weight, and about 5% to about 30% of aerosol forming agent.

[0092] The aerosol generating matrix may include metal induction heating elements. The metal induction heating elements may include multiple metal induction heating elements. The metal induction heating elements may include a metal induction heating ring element.

[0093] The packaging described herein is intended to reduce and prevent the formation of consumer-visible spots on aerosol-generating articles. Spots have been observed on aerosol-generating articles after storage in humid environments or during consumption. These spots may be caused by the absorption of water or aerosol-forming agents (including any suspended or dissolved colored substances) into the cellulose fiber web constituting the packaging. Without being bound by any theory, the interaction of water or aerosol-forming agents with the cellulose fibers of the paper and the alteration of the fiber structure result in localized changes in the optical properties of the packaging, such as brightness, color, and opacity, as well as mechanical properties such as tensile strength and permeability.

[0094] The packaging described herein is intended to reduce and prevent swelling of aerosol-generating articles. Reducing or preventing swelling of aerosol-generating articles will improve their usability for secure insertion into and removal from heating devices without damaging them.

[0095] The packaging is part of the aerosol-generating article and is arranged around the aerosol-generating matrix to help maintain the cylindrical shape of the aerosol-generating article. The packaging may contain the aerosol-generating matrix for at least about 50% of the length of the rod of the aerosol-generating matrix. Preferably, the packaging contains the aerosol-generating matrix for at least about 90% of the length of the rod of the aerosol-generating matrix. More preferably, the packaging contains the aerosol-generating matrix for at least about 100% of the length of the rod of the aerosol-generating matrix.

[0096] This packaging material can exhibit a range of permeability, including impermeability. The permeability of cigarette paper is determined 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 packaging material described herein can range from about 1 to about 10 CORESTA units, from about 5 to about 20 CORESTA units, or from about 1 to about 5 CORESTA units.

[0097] The packaging material can be formed from any cellulose material such as paper, wood, textiles, natural fibers, and synthetic fibers. Preferably, the packaging material does not contain fillers such as calcium carbonate. Preferably, the packaging material is formed from at least 90% by weight of cellulose material. Preferably, the packaging material is formed from at least 95% by weight of cellulose material.

[0098] The paper layer can be formed from any cellulose material such as paper, wood, textiles, natural fibers, and synthetic 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 cellulose material. Preferably, the paper layer is formed from at least 95% by weight of cellulose material.

[0099] 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 determined by means of the TAPPI T558 test, and the results are presented as interfacial contact angles and reported in "degrees", ranging from near zero degrees to near 180 degrees.

[0100] The paper layer can produce a negative result (no visible spots) for at least one reagent oil sample of Method Tappi 559cm-02 Classic Method 2002. The paper layer can produce a negative result for at least five, or all ten, reagent oil samples of Method Tappi 559cm-02 Classic Method 2002.

[0101] The packaging may include two paper layers, wherein the first paper layer has a first elongation at break ratio and the second paper layer has a second elongation at break ratio, and the first elongation at break ratio is less than the second elongation at break ratio. The packaging has a total thickness of less than about 80 micrometers.

[0102] The packaging may include two paper layers, wherein the first paper layer has a first elongation at break ratio and the second paper layer has a second elongation at break ratio, and the first elongation at break ratio is greater than the second elongation at break ratio. The packaging has a total thickness of less than about 80 micrometers.

[0103] The packaging may comprise two paper layers, wherein the first layer has a first elongation at break ratio and the second paper layer has a second elongation at break ratio, and the first elongation at break ratio and the second elongation at break ratio are substantially equal. The packaging has a total thickness of less than about 80 micrometers.

[0104] The packaging may include two paper layers, with a first layer contacting the aerosol to form a matrix and a second layer covering the first layer. The first layer may contain PVOH (polyvinyl alcohol) or silicone, or a surface treatment agent containing PVOH or silicone. The second layer may contain PVOH (polyvinyl alcohol) or silicone, or a surface treatment agent containing PVOH or silicone. Both the first and second layers may contain PVOH (polyvinyl alcohol) or silicone, or a surface treatment agent containing PVOH or silicone. Only the first layer may contain PVOH (polyvinyl alcohol) or silicone, or a surface treatment agent containing PVOH or silicone. Only the second layer may contain PVOH (polyvinyl alcohol) or silicone, or a surface treatment agent containing PVOH or silicone.

[0105] Aerosol-generating articles comprise an aerosol-generating matrix, which may comprise tobacco material wrapped by the packaging described herein. The aerosol-generating matrix may comprise any one or more suitable types of tobacco material or tobacco substitutes in any suitable form. The aerosol-generating matrix may comprise fire-tube flue-cured tobacco, Burley tobacco, Maryland tobacco, aromatic tobacco, specialty tobacco, homogenized or reconstituted tobacco, or any combination thereof. The aerosol-generating matrix may be provided in the form of tobacco shredded fillers, tobacco leaves, treated tobacco materials such as volume-expanded or puffed tobacco, treated stems such as cut-rolled stems or puffed stems, homogenized tobacco, reconstituted tobacco, cast leaf tobacco, or blends thereof. The term "tobacco shredded filler" is used herein to refer to tobacco material predominantly formed from the leaf portion of tobacco leaves. The term "tobacco shredded filler" is used herein to refer to a single species of the genus *Nicotiana* forming a blend of tobacco shredded fillers, as well as two or more species of the genus *Nicotiana*.

[0106] As used herein, the term "homogenized tobacco" refers to a material formed by agglomerating particulate tobacco. Homogenized tobacco may include reconstituted tobacco or cast tobacco, or a mixture of both. The term "reconstituted tobacco" refers to a paper-like material that may be made from tobacco by-products such as tobacco scraps, tobacco dust, tobacco stems, or mixtures thereof. Reconstituted tobacco can be produced by extracting soluble chemicals from tobacco by-products, processing the remaining tobacco fibers into sheets, and then applying the extracted material in a concentrated form back onto the sheets. The term "cast tobacco" is used herein to refer to a product obtained by a process well known in the art, based on casting a slurry containing ground tobacco particles and a binder (e.g., guar gum) onto a support surface such as a belt conveyor, drying the slurry, and removing the dried sheet from the support surface. Exemplary methods for generating these types of aerosol-generating matrices are 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 into sheets that are rolled, coiled, folded, or otherwise compressed, and then wrapped to form strips. For example, the sheets of homogenized tobacco material used in the present invention can be crimped using a crimping unit of the type described in CH-A-691156, which includes a pair of rotatable crimping rollers. However, it should be understood that the sheets of homogenized tobacco material used in the present invention can be textured using other suitable machines and processes that deform or perforate the sheets of homogenized tobacco material.

[0107] Aerosol-generating matrices used in aerosol-generating articles typically contain higher levels of aerosol-forming agents than combustible smoking articles such as cigarettes. Wetting agents may also be referred to as "aerosol-forming agents." The term "aerosol-forming agent" is used to describe any suitable known compound or mixture of compounds that will promote aerosol formation during use and is substantially resistant to thermal degradation at the operating temperature of the aerosol-generating matrix. 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-butanediol, 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 dodecanoate and dimethyl tetradecanoate. Preferred aerosol-forming agents are polyols or mixtures thereof, such as propylene glycol, triethylene glycol, 1,3-butanediol, and most preferably glycerol or glycerol. An aerosol-generating matrix may contain a single aerosol-forming agent. Alternatively, an aerosol-generating matrix may contain a combination of two or more aerosol-forming agents.

[0108] The aerosol generating matrix may have a high level of aerosol forming agent. As used herein, a high level of aerosol forming agent means an aerosol forming agent content greater than about 10% by weight, or preferably greater than about 15% by weight, or more preferably greater than about 20% by weight. The aerosol generating matrix may also have an aerosol forming agent content between about 10% by weight and about 30% by weight, about 15% by weight and about 30% by weight, or about 20% by weight and about 30% by weight. The aerosol generating matrix may also have a glycerol content between about 10% by weight and about 30% by weight, about 15% by weight and about 30% by weight, or about 20% by weight and about 30% by weight.

[0109] The aerosol generating matrix may contain at least about 1% by weight, or at least about 2% by weight, or at least about 5% by weight, or at least about 7% by weight, or at least about 10% by weight, or at least about 12% by weight, or at least about 15% by weight, or at least about 18% by weight of an aerosol forming agent. The aerosol generating matrix may contain an aerosol forming agent in the range of about 1% to about 20% by weight, or about 5% to about 20% by weight, or about 10% to about 20% by weight.

[0110] The aerosol-generating matrix may contain at least about 1% by weight, or at least about 2% by weight, or at least about 5% by weight, or at least about 7% by weight, or at least about 10% by weight, or at least about 12% by weight, or at least about 15% by weight, or at least about 18% by weight of glycerol. The aerosol-generating matrix may contain glycerol in the range of about 1% to about 20% by weight, or about 5% to about 20% by weight, or about 10% to about 20% by weight.

[0111] The gel-form aerosol generating matrix may contain most of the aerosol forming agent, preferably glycerol. The gel composition may include a gelling agent forming a solid medium, an aerosol forming agent such as glycerol dispersed in the solid medium, and nicotine dispersed in glycerol. This composition forms a stable gel phase. The gel composition may include at least two gelling agents forming a solid medium, glycerol dispersed in the solid medium, and nicotine dispersed in glycerol. This composition forms a stable gel phase. The gel composition may include a thickener and a gelling agent forming a solid medium, glycerol dispersed in the solid medium, and nicotine dispersed in glycerol. This composition forms a stable gel phase. A gel composition may include nicotine, an aerosol forming agent, a thickener, a hydrogen-bonded crosslinking gelling agent, and an ionic crosslinking gelling agent. The gel composition may also contain divalent cations.

[0112] The gel composition may contain a majority aerosol forming agent such as glycerol. The gel composition may contain a mixture of water and glycerol, wherein glycerol forms the majority (by weight) of the gel composition. Glycerol may form at least about 50% by weight of the gel composition. Glycerol may form at least about 60%, or about 65%, or about 70% by weight of the gel composition. Glycerol may form about 70% to about 80% by weight of the gel composition. Glycerol may form about 70% to about 75% by weight of the gel composition.

[0113] The packaging described herein is arranged around an aerosol-generating matrix. This packaging reduces the absorption of aerosol-forming agent compounds and water onto the packaging when air is drawn through a heated aerosol-generating process.

[0114] Preferably, the aerosol-generating article can be generally cylindrical. This allows the aerosol to flow smoothly. The aerosol-generating article can 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 can have a length, for example, between 10 mm and 60 mm, between 15 mm and 50 mm, or between 20 mm and 45 mm.

[0115] The resistance to suction (RTD) of aerosol-generated articles varies depending on the length and size of the passage, the size of the orifice, the size of the narrowest cross-sectional area of ​​the internal passage, and the materials used. The RTD of aerosol-generated articles can range from 50 mmH2O to 140 mmH2O, 60 mmH2O to 120 mmH2O, or 80 mmH2O to 100 mmH2O. The RTD of an article refers to the static pressure difference between one or more orifices of the article and its orifice under steady-state conditions when penetrated by an internal longitudinal passage at a volumetric flow rate of 17.5 mL / s. The RTD of a sample can be measured using the method described in ISO standard 6565:2002.

[0116] All scientific and technical terms used in this article have their common meanings in the field, unless otherwise specified. The definitions provided are for ease of understanding of certain terms used frequently in this article.

[0117] As used in this specification and the accompanying claims, the singular forms “a,” “an,” “the,” and “the” cover embodiments with plural designations, unless otherwise expressly provided.

[0118] As used in this specification and the accompanying claims, the term "or" is generally used in the sense that it includes "and / or", unless otherwise expressly provided.

[0119] As used in this article, "having," "including," and "containing" are used in their open sense and usually refer to "including but not limited to." It should be understood that phrases such as "basically composed of" and "composed of" fall under the category of "including."

[0120] The terms "preferred" and "ideally" refer to embodiments of the invention that provide certain benefits in certain circumstances. However, other embodiments may also be preferred in the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are useless, and is not intended to exclude other embodiments from the scope of the disclosure, including the claims.

[0121] Figure 1 This is a schematic cross-sectional view of the aerosol-generated product.

[0122] Figure 2 This is a schematic cross-sectional view of another aerosol-generated article.

[0123] Figure 3 This is a schematic cross-sectional view of another aerosol-generated article.

[0124] Figure 4 This is a schematic cross-sectional view of another aerosol-generated article.

[0125] Figure 5 and Figure 6 This is a schematic cross-sectional view of the aerosol generation system.

[0126] Figure 1-4 The aerosol-generating articles depicted in the figures illustrate one or more embodiments of the aerosol-generating articles or components thereof described above. These figures are not necessarily drawn to scale and are presented for illustrative purposes and not for limitation. The figures depict one or more aspects described in this disclosure. However, it should be understood that other aspects not depicted in the figures fall within the scope and spirit of this disclosure.

[0127] Figure 1 The aerosol generating article 10 illustrates an aerosol generating matrix 12 comprising a tobacco stick, a hollow cellulose acetate tube 14, a polylactic acid filter section 16, and a mouthpiece section 18 formed of cellulose acetate material. Each of these four components is wrapped with a paper layer. In particular, the aerosol generating matrix 12 is wrapped with a first paper layer 50 as described herein. The four components are arranged end-to-end and longitudinally aligned.

[0128] The aerosol generating matrix 12, the hollow cellulose acetate tube 14, and the polylactic acid filter section 16 are joined together and wrapped by a second paper layer 20 to form an intermediate article. The mouthpiece section 18 is bonded to the intermediate article with tipping paper 25 to form the aerosol generating article 10. The first paper layer 50 and the second paper layer 20 can cooperate to form the packaging as described herein.

[0129] The aerosol generating article 10 has an opening end 22 and an upstream distal end 24 located at the end of the article opposite to the opening end 22. Figure 1 The aerosol generating article 10 shown is particularly suitable for use with electrically operated aerosol generating apparatus that includes a heater for heating the aerosol generating matrix 12.

[0130] Figure 2 The aerosol generating article 100 comprises four elements arranged coaxially: a highly repellent (RTD) end bar 600 at a distal end 103, a first paper layer 500 surrounding an aerosol generating matrix 124, a fluid guide 400, and a mouthpiece 170 at a proximal end 101. These four elements are arranged sequentially and surrounded by a second paper layer 110 to form the aerosol generating article 100. The aerosol generating article 100 has a proximal end or mouth end 101 and a distal end 103 located at the end of the aerosol generating article 100 opposite to the proximal end 101. The first paper layer 500 and the second paper layer 110 cooperate to form the packaging as described herein.

[0131] Figure 3 The diagram illustrates a cross-sectional view of an example of an aerosol generating article 100, which is suitable for induction heating and for heating with a blade-shaped heating element.

[0132] The aerosol generating article 100, from proximal to distal, sequentially includes a mouthpiece 170 at proximal end 101, a fluid guide 400, a cavity 700, a first paper layer 500 surrounding the aerosol generating matrix 124, and an end bar 600. In this example, the aerosol generating matrix 124 includes a gel and a receptor (not shown). The receptor in this example is a single aluminum strip centrally positioned along the longitudinal axis of the aerosol generating matrix 124. The distal end 103 of the aerosol generating article 100 is inserted into the aerosol generating device 200 (see...). Figure 6 When the aerosol generating article 100 is in use, this portion of the aerosol generating article 100 is located adjacent to the aerosol generating apparatus 200 (see [reference]). Figure 6 The induction heating element 230 (see) Figure 5When a negative pressure is applied at the proximal end 101 of the aerosol-generating article 100, electromagnetic radiation generated by the induction heating element 230 is absorbed by the sensor and helps to heat the aerosol-generating matrix 124 in the first paper layer 500, thereby facilitating the release of material from the aerosol-generating matrix 124, such as nicotine entrained in the transferred aerosol. A fluid, such as air, enters through an orifice (not shown) into the external longitudinal passage 831 to transfer to the cavity 700 and then to the aerosol-generating matrix 124, where the fluid mixes with the aerosol-generating matrix 124 and entrains nicotine before returning to the cavity, and then exits through the internal longitudinal passage (not shown) of the fluid guide 400 before leaving at the proximal end 101.

[0133] In this example, a first paper layer 500 surrounds an aerosol generating matrix 124, and the first paper layer 500 is surrounded by a second paper layer 110. The first paper layer 500 and the second paper layer 110 form a package as described herein. The aerosol generating matrix 124 may include a gel composition.

[0134] Figure 2 and Figure 3 The aerosol-generating product 100 shown in the diagram can be used with, for example... Figure 5 and Figure 6 Used together with the aerosol generating device 200 shown.

[0135] Figure 4 The aerosol-generating article 10 illustrates an aerosol-generating matrix 12, a hollow cellulose acetate tube 14, a hollow tubular segment 16, and a mouthpiece segment 18. The aerosol-generating matrix 12 is wrapped with a first paper layer 50 as described herein. These four elements are arranged end-to-end, longitudinally aligned, and wrapped with 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 packaging as described herein.

[0136] The aerosol generating article 10 has an opening end 22 and an upstream distal end 24 located at the end of the article opposite to the opening end 22. Figure 4 The aerosol generating article 10 shown is particularly suitable for use with electrically operated aerosol generating apparatus that includes a heater for heating the aerosol generating matrix 12.

[0137] The aerosol generating matrix 12 has a length of approximately 12 mm and a diameter of approximately 7 mm. The aerosol generating matrix 12 is cylindrical in shape and has a substantially circular cross-section. The aerosol generating matrix 12 comprises an aggregated sheet of homogenized tobacco material. The homogenized tobacco material sheet contains 10% by weight of glycerol on a dry weight basis. The hollow cellulose acetate tube 14 has a length of approximately 8 mm and a thickness of approximately 1 mm. The mouthpiece segment 18 comprises a rod of cellulose acetate filaments, each 8 denier, and has a length of approximately 7 mm.

[0138] The hollow tubular section 14 is provided as a cylindrical tube with a length of approximately 18 mm and a wall thickness of approximately 100 micrometers. The aerosol generating article 10 includes a ventilation zone 26 provided approximately 5 mm upstream of the nozzle section 18. Therefore, the ventilation zone 26 is located approximately 12 mm downstream of the aerosol generating article and approximately 13 mm upstream of the hollow tubular section. Consequently, the ventilation zone 26 is located approximately 21 mm downstream of the aerosol generating matrix 12.

[0139] Figure 5-6 Examples of aerosol generating article 100 and aerosol generating apparatus 200 are shown. The aerosol generating article 100 has a proximal or inlet end 101 and a distal end 103. Figure 5 In this apparatus, the distal end 103 of the aerosol-generating article 100 is received within a container 220 of the aerosol-generating device 200. The aerosol-generating device 200 includes a housing 210 defining the container 220, which is configured to receive the aerosol-generating article 100. The aerosol-generating device 200 also includes a heating element 230 forming a cavity 235, which is preferably configured to receive the aerosol-generating article 100 via an interference fit. The heating element 230 may include a resistance heating component. Additionally, the device 200 includes a power supply 240 and control electronics 250, which cooperate to control the heating of the heating element 230.

[0140] Heating element 230 can heat the distal end 103 of aerosol generating article 100. In this example, aerosol generating matrix 124 comprises a gel containing nicotine. Heating of aerosol generating article 100 causes aerosol generating matrix 124 to generate a nicotine-containing aerosol, which can be transferred out of aerosol generating article 100 at the proximal end 101. Aerosol generating device 200 includes housing 210. Figure 5-6 The exact heating mechanism is not shown.

[0141] In some instances, the heating mechanism may be conduction heating, where heat is transferred from the heating element 230 of the aerosol generating apparatus 200 to the aerosol generating article 100. This can readily occur when the aerosol generating article 100 is positioned in the container 220 and distal end 103 (preferably the end where the aerosol generating matrix 124 is located) of the aerosol generating apparatus 200 and thus in contact with the heating element 230 of the aerosol generating apparatus 200. In a specific example, the heating element comprises heating blades that protrude from the aerosol generating apparatus 200 and are adapted to penetrate into the aerosol generating article 100 to make direct contact with the aerosol generating matrix 124.

[0142] In this example, the heating mechanism is by induction, wherein when the aerosol generating article 100 is positioned in the container 220 of the aerosol generating apparatus 200, the heating element emits radio electromagnetic radiation absorbed by the tubular element.

[0143] 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 matrix 124 to a temperature of approximately 375 degrees Celsius. When a user inhales through the mouthpiece 101 of the aerosol generating article 100, volatile compounds released from the aerosol generating matrix 124 are drawn downstream through the aerosol generating article 100 and condense to form an aerosol, which is then inhaled into the user's mouth through the mouthpiece 170 of the aerosol generating article 100. The packaging materials 500 and 110 repel aerosol forming agents and moisture from the aerosol, thereby reducing contamination and attenuation of the packaging materials 500 and 110.

[0144] The first paper layers 50 and 500 have a CD / MD breaking elongation ratio of about 2.5 or less. Preferably, the first paper layers 50 and 500 have a CD / MD breaking elongation ratio of about 2.2 or less, or about 2 or less. Preferably, the paper layers 50 and 500 have a CD / MD breaking elongation ratio in the range of about 1.8 to about 2.2.

[0145] Preferably, the first paper layers 50, 500 have a thickness of about 1.2 micrometers / gsm or less per square meter and a water contact angle of at least about 30 degrees. The first paper layers 50, 500 may have a thickness of less than about 50 micrometers or less than about 40 micrometers. The first paper layers 50, 500 may have a weight per square meter in the range of about 25 gsm to about 45 gsm, or about 35 gsm to about 40 gsm.

[0146] Preferably, the first paper layers 50, 500 have a water contact angle of at least about 30 degrees and a CD / MD breaking elongation ratio of about 2.5 or less. The first paper layers 50, 500 may have a CD / MD breaking elongation ratio of about 2.2 or less, or about 2 or less.

[0147] Preferably, the first paper layers 50, 500 have a CD / MD breaking elongation ratio of about 2.5 or less and produce negative results for at least one reagent oil sample of the Tappi 559cm-02 classical method 2002. The first paper layers 50, 500 may produce negative results for at least five, or all ten, reagent oil samples of the Tappi 559cm-02 classical method 2002.

[0148] Preferably, the packaging includes first paper layers 50, 500 and second paper layers 20, 110, wherein the first paper layers 50, 500 have a CD / MD breaking elongation ratio of about 2.5 or less.

[0149] Preferably, the packaging includes first paper layers 50, 500 and second paper layers 20, 110, wherein the first paper layers 50, 500 have a CD / MD breaking elongation ratio of about 2.5 or less and the packaging may have a total thickness of less than about 80 micrometers.

[0150] Preferably, the first paper layers 50, 500 comprise PVOH (polyvinyl alcohol) or silicone. The first paper layers 50, 500 may contain a surface treatment agent comprising PVOH or silicone. The addition of PVOH or silicone can improve the oil barrier properties of the packaging.

[0151] Preferably, the second paper layers 20 and 110 comprise PVOH (polyvinyl alcohol) or silicone. The second paper layers 20 and 110 may comprise a surface treatment agent comprising PVOH or silicone. The addition of PVOH or silicone can improve the grease barrier properties of the packaging.

[0152] The exemplary embodiments described above are not limiting. Other embodiments consistent with the exemplary embodiments described above will be apparent to those skilled in the art.

Claims

1. An aerosol-generating article comprising: an aerosol-generating substrate comprising nicotine and at least 10% of an aerosol- former, the aerosol-former comprising glycerol; and a wrapper disposed around and along the aerosol-generating substrate such that the wrapper covers a length of the aerosol-generating substrate, wherein the wrapper comprises a paper layer having a transverse / longitudinal elongation at break ratio of 1.8 to 2.

5.

2. The aerosol-generating article according to claim 1, wherein the paper layer has a transverse / longitudinal elongation at break ratio in the range of 1.8 to 2.

2.

3. The aerosol-generating article according to claim 1 or 2, wherein the paper layer has an elongation at break in the transverse direction in the range of 3% to 5% and the paper layer has an elongation at break in the longitudinal direction in the range of 1% to 3%.

4. An aerosol-generating article according to claim 1 or 2, wherein the paper layer has a grammage per square metre in the range of 25 g / m2 2 to 45 g / m2 2 and a thickness in the range of 35 micrometres to 50 micrometres.

5. The aerosol-generating article according to claim 1 or 2, wherein the paper layer comprises PVOH or silicon.

6. The aerosol-generating article according to claim 1 or 2, wherein the paper layer comprises a surface treatment agent, the surface treatment agent comprising PVOH or silicon.

7. The aerosol-generating article according to claim 5, wherein the paper layer comprises PVOH.

8. The aerosol-generating article according to claim 5, wherein the paper layer comprises silicon.

9. The aerosol-generating article according to claim 1 or 2, wherein the aerosol- generating substrate comprises a gel composition.

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

11. The aerosol-generating article according to claim 1 or 2, wherein the aerosol- generating substrate comprises homogenized tobacco material.

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

13. The aerosol-generating article according to claim 1 or 2, wherein the aerosol- generating substrate comprises one metal inductive heating element or a plurality of metal inductive heating elements.

14. The aerosol-generating article according to claim 1 or 2, wherein the wrapper comprises a first paper layer and a second paper layer, wherein only one of the first paper layer and the second paper layer comprises a surface treatment agent, the surface treatment agent comprising PVOH or silicon.

15. The aerosol-generating article according to claim 1 or 2, 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 agent, the surface treatment agent comprising PVOH or silicon.

16. The 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 agent, the surface treatment agent comprising PVOH or silicon.

17. An aerosol-generating article according to claim 1 or 2, further comprising a mouthpiece segment and a hollow tubular segment, the mouthpiece segment and the hollow tubular segment being arranged in end-to-end longitudinal alignment with the aerosol- generating substrate, and a second paper layer circumscribing the aerosol-generating substrate, the mouthpiece segment and the hollow tubular segment.

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