Stable wrappers for aerosol-generating articles

Abstract

To provide an aerosol generating article that includes a wrapper that does not swell up by absorbing water or compounds contained in an aerosol generating substrate.SOLUTION: An aerosol generating article 10 includes an aerosol generating substrate 12 comprising nicotine, and a wrapper 50 disposed about the aerosol generating substrate. The wrapper includes a paper layer having a thickness / grammage of about 1.2 micrometers / gsm or less, the paper layer including a surface treatment including polyvinyl alcohol or siloxane.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to wrappers used in aerosol generating articles, which have a high paper density and may also be utilized with an aerosol generating substrate.

Background Art

[0002] 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, the aerosol is generated by transferring heat from a heat source to a physically separated aerosol generating substrate or material, which may be 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 substrate by heat transfer from the heat source and entrained in the air drawn through the aerosol generating article. The released compounds condense to form an aerosol as they cool.

[0003] 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 article, or moisture or water around the paper. The absorbed liquid may stain or weaken the paper and also adversely affect the appearance and structural integrity of the aerosol generating article. Heated aerosol generating articles are particularly susceptible to wetting and breakage due to the high levels of aerosol formers in the aerosol generating substrates of these heated aerosol generating articles. Heated aerosol generating articles are particularly prone to expansion when aerosol components are absorbed by the wrapper, leading to difficulty in removal from the heating device. Heated aerosol generating articles are particularly prone to breakage when they are firmly received and then removed from the heating device.

[0004] It is particularly desirable to provide a visually and mechanically stable, rolled aerosol-generating substrate for aerosol-generating articles containing high levels of liquid-forming or aerosol-forming materials.

[0005] It is desirable to provide an aerosol generating article that includes a wrapper that does not swell by absorbing water or compounds contained in the aerosol generating substrate.

[0006] It is desirable to provide an aerosol generating article that includes a wrapper that provides a grease barrier to the grease compounds contained in the aerosol generating substrate.

[0007] Furthermore, it is desirable that this wrapper does not affect the taste of aerosols generated by the aerosol-generating item.

[0008] Furthermore, it is desirable that this wrapper does not easily ignite when it is in close proximity to a heat source. [Overview of the Initiative]

[0009] The object of the present invention may be to at least partially solve one or more of the desirable technical advantages described above.

[0010] The present disclosure provides an aerosol generating article comprising an aerosol generating substrate containing nicotine and a wrapper disposed around the aerosol generating substrate. The wrapper comprises a paper layer having a thickness / basis weight of approximately 1.2 micrometers / gsm or less.

[0011] The present disclosure provides an aerosol generating article comprising an aerosol generating substrate containing nicotine and at least about 10% aerosol forming agent (including glycerin), and a wrapper disposed around the aerosol generating substrate and in contact with the aerosol generating substrate. The wrapper comprises a paper layer having a thickness / basis weight of about 1.2 micrometers / gsm or less.

[0012] This disclosure provides an aerosol-generating article. The aerosol-generating article may comprise an aerosol-generating substrate. The aerosol-generating substrate may include a wrapper. The wrapper may be arranged around the aerosol-generating substrate. The wrapper comprises a paper layer having a thickness / basis weight of about 1.2 micrometers / gsm or less.

[0013] The paper layer preferably has a thickness / basis weight in the range of approximately 1.0 micrometers / gsm to approximately 1.2 micrometers / gsm. The paper layer may have a thickness of less than approximately 50 micrometers or less than approximately 40 micrometers. The wrapper includes a paper layer having a basis weight in the range of approximately 25 gsm to approximately 45 gsm, or approximately 35 gsm to approximately 40 gsm.

[0014] The paper layer preferably has a thickness / basis weight of about 1.2 micrometers / gsm or less and a water contact angle of at least about 30 degrees. The paper layer may also have a water contact angle of at least about 40 degrees, or at least about 45 degrees.

[0015] The term "MD" refers to the machine direction of the wrapper. 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 roll of paper being wound from the paper machine. The machine direction is sometimes also called the grain direction.

[0016] The term "CD" refers to the lateral direction of the wrapper. The lateral direction of the wrapper is the in-plane direction of the wrapper. The lateral direction of the wrapper is perpendicular to the machine direction of the wrapper.

[0017] The paper layer may have a CD / MD elongation ratio of approximately 2.5 or less. The paper layer may have a CD / MD elongation ratio of approximately 2.2 or less, or approximately 2 or less. The paper layer may have a CD / MD elongation ratio in the range of approximately 1.8 to 2.2.

[0018] The wrapper preferably has a thickness / basis weight of approximately 1.2 micrometers / gsm or less and comprises a paper layer that yields a negative result for at least one kit oil sample of Method Tappi 559cm-02 Classical Method 2002. The paper layer may yield a negative result for at least five kit oil samples, or even all ten kit oil samples, of Method Tappi 559cm-02 Classical Method 2002.

[0019] The wrapper comprises two paper layers, the first having a first thickness / grammage value and the second having a second thickness / grammage value, preferably the first thickness / grammage value being smaller than the second. The first thickness / grammage value may be less than 1.2 micrometers / gsm, and the wrapper may have a total thickness of less than about 80 micrometers.

[0020] The paper layer preferably contains PVOH (polyvinyl alcohol) or silicone. The paper layer may also include a surface treatment containing PVOH or silicone. The addition of PVOH (polyvinyl alcohol) or silicone may improve the grease barrier properties of the wrapper.

[0021] The term "silicon" refers to siloxane. Preferably, the silicon or siloxane includes polydimethylsiloxane.

[0022] Preferably, the aerosol generating substrate may include homogenized tobacco material. The homogenized tobacco material may contain, on a dry mass basis, tobacco material, about 1% to about 5% of a binder, and about 5% to about 30% of an aerosol forming body.

[0023] Preferably, the aerosol generating substrate may include a gel composition. The gel composition may contain a large amount (by weight) of glycerin. The gel composition may also contain xanthan gum.

[0024] Preferably, the aerosol generating substrate may include a metal induction heating element. The metal induction heating element may include a plurality of metal induction heating elements. The metal induction heating element may include a metal induction heating ring element.

[0025] The wrapper may be formed of a single paper layer. The wrapper may be formed of two paper layers. The wrapper may be formed of three or more paper layers.

[0026] The wrapper preferably covers at least 20%, at least 50%, at least 80%, at least 90%, at least 95%, at least 99%, or preferably substantially the entire length of the aerosol generating substrate. The wrapper preferably covers the entire aerosol generating substrate and does not extend beyond the aerosol generating substrate.

[0027] When the wrapper has two or more paper layers, the first paper layer may have the specific properties described herein, and the second paper layer may be regarded as a conventional paper layer. The second paper layer may preferably be disposed outside the first paper layer. Alternatively, the first paper layer may be disposed outside the second paper layer. The first paper layer having the specific properties described herein is preferably in contact with the aerosol forming substrate.

[0028] [[ID=P15]] When the wrapper has two or more paper layers, the first paper layer may have the specific properties described herein, and the second paper layer may also have the specific properties described herein. All the paper layers forming the wrapper may have the specific properties described herein. In particular, one or both of the paper layers forming the wrapper may contain PVOH (polyvinyl alcohol) or silicon. One or both of the paper layers forming the wrapper may include a surface treatment containing PVOH or silicon.

[0029] Advantageously, the aerosol-generating article comprising the wrapper described herein may reduce the absorption of moisture, water, aerosol former, or grease in the smoke or aerosol passing through the aerosol-generating article. As a result, even when a high level of aerosol former is included in the aerosol-generating substrate, expansion, visible soiling, and physical weakening of the wrapper portion of the aerosol-generating article may be reduced.

[0030] Advantageously, the aerosol-generating article provides a visually and mechanically stable, wound aerosol-generating substrate that avoids expansion. This is particularly useful for heat-not-burn aerosol-generating articles that may be inserted into a heating device. The aerosol-generating article wrapper is resistant to combustion when in proximity to the heating element, and thus the inductive heating element may be incorporated throughout the aerosol-generating substrate.

[0031] The term "aerosol-generating article" is used herein to mean an article in which an aerosol-generating substrate is heated to generate an inhalable aerosol and deliver it to a consumer. As used herein, the term "aerosol-generating substrate" means a substrate having the ability to release volatile compounds upon heating to generate an aerosol.

[0032] Conventional cigarettes are ignited when the user lights a flame at one end of the cigarette and inhales air through the other end. The localized heat provided by the flame and the oxygen in the air drawn through the cigarette cause the end of the cigarette to ignite, and the resulting combustion produces inhalable smoke. In contrast, in heated aerosol generating articles, the aerosol is generated by heating a flavor-generating substrate (such as tobacco). Known heated aerosol generating articles include, for example, electrically heated aerosol generating articles and aerosol generating articles in which an aerosol is generated by the transfer of heat from a combustible fuel element or heat source to a physically separated aerosol-forming substrate. For example, the aerosol generating article according to this disclosure has a particular application in an aerosol generating system comprising an electrically heated aerosol generating device having an internal heater blade adapted to be inserted into a rod of an aerosol generating substrate. This type of aerosol generating article is described in the prior art, for example, European Patent No. EP0822670.

[0033] As used herein, the term "aerosol generator" refers to a device comprising a heater element that interacts with an aerosol-generating substrate of an aerosol-generating article to generate an aerosol.

[0034] As used herein, the term "aerosol generating system" refers to a combination of an aerosol generating device and an aerosol generating article.

[0035] The term "aerosol generating substrate" refers to a substance having the ability to generate or release aerosols. The aerosol generating substrate may be a solid, paste, gel, slurry, liquid, or 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 contain nicotine.

[0036] The aerosol generating article may comprise an aerosol generating substrate and a mouthpiece. The mouthpiece may include a filter. The chipping wrapper may have the filter attached to the aerosol generating substrate.

[0037] The aerosol generating substrate may be a solid composition. This composition may also contain plant-based materials. The aerosol generating substrate may contain tobacco, and preferably the tobacco contains volatile tobacco-flavored compounds that are released from the aerosol generating substrate upon heating. The aerosol generating substrate may also contain homogenized tobacco material, an aerosol-forming agent, and a binder.

[0038] Nicotine may be present in the aerosol generating substrate in an amount of about 0.5 to about 10% by weight, or in an amount of about 0.5 to about 5% by weight. Preferably, the aerosol generating substrate 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.

[0039] The aerosol generating substrate may contain flavoring agents. Plant materials provide flavoring agents that may impart flavor to the taste of aerosols generated by the aerosol generating article. Flavoring agents are any natural or artificial compounds that affect the sensory stimulating quality of the aerosol. Non-limiting examples of sources of flavoring agents include mint (such as peppermint and spearmint), coffee, tea, cinnamon, clove, cocoa, vanilla, eucalyptus, geranium, agave, and juniper, as well as combinations thereof.

[0040] The aerosol generating substrate may contain essential oils. Essential oils may provide flavorings that impart flavor to the taste of aerosols 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 substrate 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 substrate in an amount ranging from about 0.1% to about 10% by weight, or from about 0.1% to about 5% by weight, or from about 0.5% to about 2% by weight.

[0041] The aerosol generating substrate may include a gel composition. 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. In this context, room temperature means 25 degrees Celsius. A gel may also be defined as a substantially diluted system that does not flow in a steady state. On a weight basis, gels may be almost liquid, but nevertheless they behave like solids due to a three-dimensional crosslinking network within the liquid. Crosslinking in the fluid gives the gel its structure (hardness). Thus, a gel may be a dispersion of liquid molecules in a solid, where liquid particles are dispersed within a solid medium.

[0042] The gel composition may contain a gelling agent that forms a solid medium, an aerosol-forming agent such as glycerin dispersed in the solid medium, and nicotine dispersed in the glycerin. The composition forms a stable gel phase. The gel composition may contain at least two gelling agents that form a solid medium, glycerin dispersed in the solid medium, and nicotine dispersed in the glycerin. The composition forms a stable gel phase. The gel composition may contain a thickener, a gelling agent that forms a solid medium, glycerin dispersed in the solid medium, and nicotine dispersed in the glycerin. The composition forms a stable gel phase. The gel composition may contain nicotine, an aerosol-forming agent, a thickener, a hydrogen-bonding crosslinking gelling agent, and an ion-crosslinking gelling agent. The gel composition may further contain divalent cations.

[0043] The term "thickener" 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 glycerin at 25°C, increases viscosity without causing gel formation, causing the mixture to remain in a fluid state or stay fluid. Preferably, a thickener 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 glycerin at 25°C, increases viscosity by at least 50 cPs, preferably at least 200 cPs, preferably at least 500 cPs, preferably at least 1000 cPs, without causing gel formation, at a shear rate of 0.1 s⁻¹, causing the mixture to remain in a fluid state or stay fluid. Preferably, the thickener 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 glycerin at 25°C, increases the viscosity to at least twice, at least five times, at least ten times, or at least 100 times higher than before the addition, without causing gel formation, at a shear rate of 0.1 s⁻¹, and causes the mixture to remain in a fluid state or stay fluid.

[0044] The viscosity values ​​listed herein can be measured using a Brookfield RVT viscometer with a disc-type RV#2 spindle rotated at a speed of 6 revolutions per minute (rpm) at 25°C.

[0045] The term "gelling agent" refers to a compound that, when added in an amount of approximately 0.3% by weight to a mixture of 50% by weight water and 50% by weight glycerin, forms a solid medium or supporting matrix that uniformly leads to a gel. Examples of gelling agents include, but are not limited to, hydrogen bonding crosslinking gelling agents and ion crosslinking gelling agents.

[0046] The term "hydrogen bond crosslinking gelling agent" refers to a gelling agent that forms non-covalent or physical crosslinks via hydrogen bonds. Hydrogen bonds are not covalent bonds to hydrogen atoms, but rather a type of electrostatic dipole-dipole attraction between molecules. This results from the attraction between a hydrogen atom covalently bonded to an extremely electronegative atom, such as N, O, or F atoms, and another extremely electronegative atom.

[0047] The term "ionic crosslinking gelling agent" refers to a gelling agent that forms non-covalent or physical crosslinks via ionic bonding. Ionic crosslinking involves the association of polymer chains through non-covalent interactions. A crosslinking network is formed when polyvalent molecules with opposite charges are electrostatically attracted to each other, creating a crosslinked polymer network.

[0048] The gel composition contains an aerosol-forming body. Ideally, the aerosol-forming body is substantially resistant to thermal decomposition at the operating temperature of the associated aerosol generator. Suitable aerosol-forming bodies include, but are not limited to, polyhydric alcohols (such as triethylene glycol, 1,3-butanediol, and glycerin), esters of polyhydric alcohols (such as glycerin monoacetate, diacetate, or triacetate), and aliphatic esters of monocarboxylic acids, dicarboxylic acids, or polycarboxylic acids (such as dimethyl dodecanediol and dimethyl tetradecanediol). The polyhydric alcohol or a mixture thereof may be one or more of triethylene glycol, 1,3-butanediol, and glycerin (glycerin or propane-1,2,3-triol) or polyethylene glycol. The aerosol-forming body is preferably glycerin.

[0049] The gel composition may contain a large amount of aerosol-forming material such as glycerin. The gel composition may also contain a mixture of water and glycerin, where glycerin forms the majority (by weight) of the gel composition. Glycerin may form at least about 50% by weight of the gel composition. Glycerin may form at least about 60% by weight, or about 65% by weight, or about 70% by weight of the gel composition. Glycerin may form about 70% to about 80% by weight of the gel composition. Glycerin may form about 70% to about 75% by weight of the gel composition.

[0050] The gel composition is preferably water-free or contains only a low level of water. If the gel composition is water-free or contains only a low level of water, it may also contain higher levels of aerosol-forming agents, gelling agents, thickeners, and other compounds such as nicotine. Furthermore, a gel composition that is water-free or contains only a low level of water is simpler and requires less energy to vaporize. Aerosols formed from a gel composition that is water-free or contains only a low level of water may be perceived by the user as not being very hot. The gel composition is preferably water-free, The gel composition preferably contains at least about 10% by weight, or at least about 15% by weight, of water. The gel composition preferably contains water in the range of about 15% to about 25% by weight.

[0051] The gel composition may contain a gelling agent, which is a hydrogen-bonding crosslinking gelling agent and an ion-crosslinking gelling agent. The gel composition may further contain a thickening agent. The gelling agent may form a solid medium in which an aerosol-forming agent may be dispersed. The gelling agent may form a solid medium in which an aerosol-forming agent and water may be dispersed. The thickening agent combined with the hydrogen-bonding crosslinking gelling agent and the ion-crosslinking gelling agent appears to remarkably support the solid medium and maintain the gel composition even when the gel composition contains high levels of glycerin.

[0052] The gel composition may contain a gelling agent in an amount ranging from about 0.4% to about 10% by weight. Preferably, the composition may contain a gelling agent in an amount ranging from about 0.5% to about 8% by weight. Preferably, the composition may contain a gelling agent in an amount ranging from about 1% to about 6% by weight. Preferably, the composition may contain a gelling agent in an amount ranging from about 2% to about 4% by weight. Preferably, the composition may contain a gelling agent in an amount ranging from about 2% to about 3% by weight. The gel composition may contain a thickening agent in an amount ranging from about 0.2% to about 5% by weight. A thickening agent in an amount ranging from about 0.5% to about 3% by weight is preferred. A thickening agent in an amount ranging from about 0.5% to about 2% by weight is preferred. A thickening agent in an amount ranging from about 1% to about 2% by weight is preferred.

[0053] The gel composition may contain a thickener, a hydrogen bond crosslinking gelling agent, and an ion crosslinking gelling agent in a total amount of about 1% to about 8% by weight. Preferably, the gel composition may contain a thickener, a hydrogen bond crosslinking gelling agent, and an ion crosslinking gelling agent in a total amount of about 2% to about 6% by weight. Preferably, the gel composition may contain a thickener, a hydrogen bond crosslinking gelling agent, and an ion crosslinking gelling agent in a total amount of about 3% to about 5% by weight.

[0054] The gel composition may contain a thickener, a hydrogen bond crosslinking gelling agent, and an ion crosslinking gelling agent, each present independently in the gel composition in an amount ranging from about 0.3% to about 3% by weight. Preferably, the gel composition may contain a thickener, a hydrogen bond crosslinking gelling agent, and an ion crosslinking gelling agent, each present independently in the gel composition in an amount ranging from about 0.5% to about 2% by weight. Preferably, the gel composition may contain a thickener, a hydrogen bond crosslinking gelling agent, and an ion crosslinking gelling agent, each present independently in an amount ranging from about 1% to about 2% by weight.

[0055] The thickener may contain one or more of the following: xanthan gum, carboxymethylcellulose, microcrystalline cellulose, methylcellulose, gum arabic, guar gum, lambda-carrageenan, or starch. It is preferable that the thickener contains xanthan gum.

[0056] The gel composition may contain a thickening agent (such as xanthan gum) in an amount ranging from about 0.2% to about 5% by weight. Preferably, the amount of xanthan gum may be in the range of about 0.5% to about 3% by weight. Preferably, the amount of xanthan gum may be in the range of about 0.5% to about 2% by weight. Preferably, the amount of xanthan gum may be in the range of about 1% to about 2% by weight.

[0057] The hydrogen bonding crosslinking gelling agent may contain one or more of galactomannan, gelatin, agarose, konjac gum, or agar. It is preferable that the hydrogen bonding crosslinking gelling agent contains agar.

[0058] The gel composition may contain a hydrogen bonding crosslinking gelling agent (such as agar) in an amount ranging from about 0.3% to about 5% by weight. Preferably, the composition may contain a hydrogen bonding crosslinking gelling agent in an amount ranging from about 0.5% to about 3% by weight. Preferably, the composition may contain a hydrogen bonding crosslinking gelling agent in an amount ranging from about 1% to about 2% by weight.

[0059] The ion-crosslinking gelling agent may include low-acylgellan, pectin, kappa-carrageenan, iota-carrageenan, or alginate. It is preferable that the ion-crosslinking gelling agent includes low-acylgellan.

[0060] The gel composition may contain an ion-crosslinking gelling agent (such as a low-acyl gellan) in an amount ranging from about 0.3% to about 5% by weight. Preferably, the composition may contain an ion-crosslinking gelling agent in an amount ranging from about 0.5% to about 3% by weight. Preferably, the composition may contain an ion-crosslinking gelling agent in an amount ranging from about 1% to about 2% by weight.

[0061] The gel composition may further contain divalent cations. Preferably, the divalent cations may include calcium ions such as calcium lactate in the solution. Divalent cations (such as calcium ions) may assist in gel formation in compositions containing gelling agents, such as ion-crosslinking gelling agents. Ionic effects may assist in 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.

[0062] The gel composition may further 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 fewer than 10 carbon atoms, such as levulinic acid or lactic acid, or fewer than 6 carbon atoms, or fewer than 4 carbon atoms. Preferably, the carboxylic acid has three carbon atoms (such as lactic acid). Surprisingly, lactic acid improves the stability of the gel composition to a greater extent than similar carboxylic acids. Carboxylic acids may assist in gel formation. Carboxylic acids may reduce changes in nicotine concentration in the gel composition during storage.

[0063] The gel composition may contain a carboxylic acid (such as lactic acid) in an amount ranging from about 0.1% to about 5% by weight. Preferably, the carboxylic acid may be in an amount ranging from about 0.5% to about 3% by weight. Preferably, the carboxylic acid may be in an amount ranging from about 0.5% to about 2% by weight. Preferably, the carboxylic acid may be in an amount ranging from about 1% to about 2% by weight.

[0064] Nicotine is contained within the gel composition. Nicotine may be added to the composition in the form of a free base or a salt. 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 embodiments, 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.

[0065] The aerosol generating system may include a heat source, an aerosol generating substrate, at least one air intake downstream of the aerosol generating substrate, and an airflow path extending between at least one air intake and the mouth end of an article. The heat source is preferably located upstream of the aerosol generating substrate. The heat source may be integrated with the aerosol generating device, and the aerosol generating article, which is a consumable item, may be removably received within the aerosol generating device.

[0066] The heat source may be a flammable 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 into 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 thus may be in the form of a hollow cylinder or any other suitable such form. Alternatively, the heat source may be a flammable heat source. As used herein, a flammable heat source is a heat source that burns itself to generate heat during use, but unlike cigarettes, cigars, or cigarillos, the combustion of the aerosol generating substrate is not involved. The flammable heat source may comprise carbon and an ignition aid such as a metal peroxide, superoxide, or nitrate, where the metal is an alkali metal or alkaline earth metal.

[0067] The aerosol generating substrate may include an inductive heating element or a susceptor, or multiple inductive heating elements or susceptors. The inductive heating element or susceptor is heated in the presence of an alternating or fluctuating electromagnetic field. When heating is by induction, the fluctuating electromagnetic field is transmitted through the aerosol generating article to the inductive heating element or susceptor, thereby causing the susceptor or inductive heating element to convert the fluctuating field into thermal energy, and thus heat the aerosol generating substrate.

[0068] The induction heating element or susceptor may be formed from any material that can be inductively heated to a temperature sufficient to generate aerosols from the aerosol generating substrate. The induction heating element or susceptor may contain metal or carbon. Preferred induction heating elements or susceptors may contain ferromagnetic materials (e.g., ferrite iron), or ferromagnetic steel or stainless steel. The induction heating element or susceptor may contain aluminum. The induction heating element or susceptor may be formed from 400 series stainless steel, e.g., Grade 410, or Grade 420, or Grade 430 stainless steel 20. Different materials dissipate different amounts of energy when positioned in an electromagnetic field having similar values ​​of frequency and magnetic field strength. The induction heating element or susceptor is preferably heated to a temperature above 250 degrees Celsius. However, the induction heating element or susceptor is preferably heated to below 350 degrees Celsius to prevent combustion of the material in contact with the susceptor.

[0069] The inductive heating element or susceptor may be positioned close to the wrapper of the aerosol generating substrate, as the wrapper described herein is advantageously resistant to combustion.

[0070] The term “mouthpiece” is used herein to indicate a portion of an aerosol-generating article designed to come into contact with the consumer’s mouth. The mouthpiece may be a portion of an aerosol-generating article that includes a filter, or in some cases, the mouthpiece may be defined by the extent of a chipping wrapper. In other cases, the mouthpiece may be defined as a portion of an aerosol-generating article that extends approximately 40 mm from the mouth-side end of the aerosol-generating article, or approximately 30 mm from the mouth-side end of the aerosol-generating article.

[0071] The terms "upstream" and "downstream" refer to the relative positions of elements of an aerosol generating article, described with respect to the direction of the aerosol as it is drawn from the aerosol generating substrate and passes through the mouthpiece.

[0072] The terms “wrapper” or “paper wrapper” are interchangeable and refer to one or more layers of wrapping material made of paper that contain an aerosol-generating substrate or surround an aerosol-generating substrate to maintain the shape of an aerosol-generating article. The wrapper reduces staining on the outer surface of the aerosol-generating article. The wrapper is preferably in contact with the aerosol-generating substrate.

[0073] The term "hydrophobic" refers to a surface that exhibits water-repellent properties. One useful way to determine this is by measuring the water contact angle. The water contact angle is the angle at which the liquid / vapor interface intersects the solid surface, traditionally measured through a liquid. This quantifies the wettability of a solid surface by a liquid, via Young's equation. This disclosure relates to a wrapper used in an aerosol generating article, wherein the wrapper has a high-density paper layer and may be used together with an aerosol generating substrate. According to this disclosure, an aerosol generating article is provided comprising an aerosol generating substrate containing nicotine and a wrapper disposed around the aerosol generating substrate. The wrapper includes a paper layer having a thickness / basis weight of about 1.2 micrometers / gsm or less.

[0074] The wrapper preferably comprises a paper layer having a thickness / basis weight in the range of approximately 0.8 micrometers / gsm to approximately 1.2 micrometers / gsm. The paper layer may have a thickness / basis weight in the range of approximately 1.0 micrometers / gsm to approximately 1.2 micrometers / gsm. The paper layer may have a thickness / basis weight of approximately 1.0 micrometers / gsm. The paper layer may have a thickness / basis weight of approximately 0.9 micrometers / gsm. The paper layer may have a thickness / basis weight of approximately 1.0 micrometers / gsm. The paper layer may have a thickness / basis weight of approximately 1.1 micrometers / gsm. The paper layer may have a thickness / basis weight of approximately 1.2 micrometers / gsm.

[0075] The paper layer may have a thickness of less than approximately 50 micrometers or less than approximately 40 micrometers. The paper layer may have a thickness in the range of approximately 10 micrometers to approximately 50 micrometers. The paper layer may have a thickness in the range of approximately 20 micrometers to approximately 50 micrometers. The paper layer may have a thickness in the range of approximately 30 micrometers to approximately 50 micrometers. The paper layer may have a thickness in the range of approximately 35 micrometers to approximately 50 micrometers. The paper layer may have a thickness in the range of approximately 35 micrometers to approximately 40 micrometers. The paper layer may have a thickness in the range of approximately 40 micrometers to approximately 50 micrometers. The paper layer may have a basis weight in the range of approximately 25 gsm to approximately 45 gsm. The paper layer may have a basis weight in the range of approximately 30 gsm to approximately 45 gsm. The paper layer may have a basis weight in the range of approximately 35 gsm to approximately 45 gsm. The paper layer may have a basis weight in the range of approximately 35 gsm to approximately 40 gsm.

[0076] In one embodiment, the paper layer has a basis weight of approximately 35 gsm and a thickness of approximately 37 micrometers. This paper layer has a thickness / basis weight value of approximately 1.06.

[0077] The paper layer preferably contains PVOH (polyvinyl alcohol) or silicone. In one embodiment, the paper layer contains PVOH (polyvinyl alcohol). PVOH may be applied to the paper layer as a surface coating. PVOH may be placed on the outer surface of the paper layer of the aerosol generating article. PVOH may be placed on the outer surface of the paper layer of the aerosol generating article and a layer may be formed thereon. PVOH may be placed on the inner surface of the paper layer of the aerosol generating article. PVOH may be placed on the inner surface of the paper layer of the aerosol generating article and a layer may be formed thereon. PVOH may be placed on both the inner and outer surfaces of the paper layer of the aerosol generating article. PVOH may be placed on both the inner and outer surfaces of the paper layer of the aerosol generating article and a layer may be formed thereon.

[0078] The paper layer may include a surface treatment containing PVOH or silicon. The paper layer may include a surface treatment containing PVOH. The paper layer may include a surface treatment containing silicon. This surface treatment may be applied to the outer surface of the paper layer. This surface treatment may be applied to the inner surface of the paper layer. This surface treatment 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.

[0079] The aerosol generating substrate may include a gel composition. The gel composition may include a large amount of aerosol-forming agent such as glycerin. The gel composition may include nicotine, at least about 50% by weight of glycerin or at least 70% by weight of glycerin, at least about 0.2% by weight of a hydrogen-bonding crosslinking gelling agent, at least about 0.2% by weight of an ion-crosslinking gelling agent, and at least about 0.2% by weight of a thickening agent. The gel composition may also include xanthan gum.

[0080] The aerosol generating substrate may contain homogenized tobacco material. The homogenized tobacco material may contain, on a dry weight basis, tobacco material, approximately 1% to 5% of a binder, and approximately 5% to 30% of aerosol forming material.

[0081] The aerosol generating substrate 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.

[0082] The wrappers described herein are intended to reduce and prevent the formation of stains on aerosol-generating articles that are visible to consumers. Stains have been observed to appear on aerosol-generating articles during storage in humid environments or during consumption. Stains may result from the absorption of water or aerosol-forming substances containing any colored substance suspended or dissolved within the web of cellulosic fibers that constitute the wrapper. While not bound by any theory, water or aerosol-forming substances interact with the cellulosic fibers of the paper and alter the structure of the fibers, resulting in localized changes in optical properties such as brightness, color, and opacity, as well as mechanical properties such as tensile strength and permeability of the wrapper.

[0083] The wrappers described herein are intended to reduce and, in some cases, prevent the expansion of aerosol-generating articles. Reducing or preventing the expansion of aerosol-generating articles improves the usefulness of the aerosol-generating articles, allowing them to be reliably inserted into and removed from heating devices without damaging them.

[0084] A wrapper is a portion of an aerosol-generating article that is positioned around the aerosol-generating substrate to help maintain the cylindrical shape 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.

[0085] This wrapper may exhibit a range of permeability, including no permeability. 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 square centimeter, referred to as "cholesta units." The permeability of the wrappers described herein may be in the range of about 1 to about 10 cholesta units, about 5 to about 20 cholesta units, or about 1 to about 5 cholesta units.

[0086] The wrapper may be formed from any cellulosic material such as paper, wood, cloth, natural fibers, and artificial fibers. Preferably, the wrapper does not contain fillers such as calcium carbonate. Preferably, the wrapper is formed from at least 90% by weight of cellulosic material. Preferably, the wrapper is formed from at least 95% by weight of cellulosic material.

[0087] The paper layer may be formed from any cellulosic material such as paper, wood, fabric, natural fibers, and artificial 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 cellulosic material. Preferably, the paper layer is formed from at least 95% by weight of cellulosic material.

[0088] The surface of the paper layer may have a water contact angle of at least about 30 degrees, or at least about 35 degrees, at least about 40 degrees, or at least about 45 degrees. The hydrophobicity or water contact angle is determined using the TAPPI T558 test, and the results are presented as the interfacial contact angle, also reported in degrees, and can range from approximately 0 degrees to approximately 180 degrees.

[0089] The paper layer may have a CD / MD elongation ratio of approximately 2.5 or less. The paper layer may have a CD / MD elongation ratio of approximately 2.2 or less, or approximately 2 or less. The term "MD" refers to the machine direction of the paper layer. The machine direction may also be called the grain direction of the paper layer. The term "CD" refers to the transverse direction of the paper layer, which is perpendicular to the machine direction of the paper layer.

[0090] The paper layer may have a negative result (no visible stain) for at least one kit oil sample of Method Tappi 559cm-02 Classical Method 2002. The paper layer may have a negative result for at least five kit oil samples, or all ten kit oil samples, of Method Tappi 559cm-02 Classical Method 2002.

[0091] The wrapper may include two paper layers, the first having a first thickness / grammage value and the second having a second thickness / grammage value, and the first thickness / grammage value is smaller than the second thickness / grammage value. The first thickness / grammage value may be less than 1.2 micrometers / gsm, and the wrapper has a total thickness of less than approximately 80 micrometers.

[0092] The wrapper may include two paper layers, the first layer in contact with the aerosol-forming substrate, and the second layer overlapping the first layer and forming the outer surface of the aerosol-forming article. The first layer may have a first thickness / basis weight of less than 1.2 micrometers / gsm, and the second layer may have a second thickness / basis weight greater than 1.2 micrometers / gsm.

[0093] The wrapper may include two paper layers, the first layer in contact with the aerosol-forming substrate, and the second layer overlapping the first layer and forming the outer surface of the aerosol-forming article. The first layer may have a first thickness / basis weight of less than 1.2 micrometers / gsm, and the second layer may have a second thickness / basis weight of less than 1.2 micrometers / gsm.

[0094] The wrapper may include two layers of paper, the first layer in contact with the aerosol-forming substrate and the second layer overlapping the first layer. The first layer may contain PVOH (polyvinyl alcohol) or silicone, or may include a surface treatment containing PVOH or silicone. The second layer may contain PVOH (polyvinyl alcohol) or silicone, or may include a surface treatment containing PVOH or silicone. Both the first and second layers may contain PVOH (polyvinyl alcohol) or silicone, or may include a surface treatment containing PVOH or silicone. Only the first layer may contain PVOH (polyvinyl alcohol) or silicone, or may include a surface treatment containing PVOH or silicone. Only the second layer may contain PVOH (polyvinyl alcohol) or silicone, or may include a surface treatment containing PVOH or silicone.

[0095] An aerosol-generating article comprises an aerosol-generating substrate, which may include a tobacco load enclosed by the wrapper described herein. The aerosol-generating substrate may include any suitable type(s) of tobacco material or tobacco substitute in any suitable form. The aerosol-generating substrate may include full-cure tobacco, Burley tobacco, Maryland tobacco, Oriental tobacco, specialty tobacco, homogenized tobacco or recombined tobacco, or any combination thereof. The aerosol-generating substrate may be provided in the form of tobacco cut filler, tobacco leaf blades, processed tobacco material such as volume-expanded or puffed tobacco, processed tobacco stems such as cut-rolled or cut-puffed stems, homogenized tobacco, recombined tobacco, cast-leaf tobacco, or blends thereof, and similar. The term “tobacco cut filler” is used herein to refer to tobacco material primarily formed from the leaf blade portion of tobacco leaves. The term “tobacco cut filler” is used herein to refer to both a single species of the genus Nicotiana and two or more species of the genus Nicotiana that form a tobacco cut filler blend.

[0096] As used herein, the term “homogenized tobacco” means a material formed by agglomerating particulate tobacco. Homogenized tobacco may include reconstituted tobacco, cast leaf tobacco, or a mixture of both. The term “reconstituted tobacco” refers to a paper-like material that can be made from tobacco by-products such as tobacco powder, tobacco dust, tobacco stalks, or mixtures thereof. Reconstituted tobacco can be made by extracting soluble chemicals from tobacco by-products, processing the remaining tobacco fibers into a sheet, and then reapplying the extracted material in a concentrated form onto the sheet. The term “cast leaf tobacco” is used herein to refer to a product resulting from a process well known in the art, which involves casting a slurry containing ground tobacco particles and a binder (e.g., guar) onto a support surface (such as a conveyor belt), drying the slurry, and removing the dried sheet from the support surface. Exemplary methods for producing these types of aerosol-generating substrates are described in U.S. Patents No. 5,724,998, 5,584,306, 4,341,228, 5,584,306, and 6,216,706. Homogenized tobacco may be crimped, rolled, folded, or otherwise compressed to form a sheet before being rolled to form a rod. For example, a homogenized tobacco material sheet for use in the present invention may be crimped using a crimping unit of the type described in Swiss Patent No. 691156, which has a pair of rotatable crimping rollers. However, naturally, a homogenized tobacco material sheet for use in the present invention may be textured using other suitable machinery and processes for deforming or perforating the homogenized tobacco material sheet.

[0097] Aerosol-generating substrates used in aerosol-generating articles generally contain a higher level of aerosol-forming compounds (may include multiple) than combustible smoking articles such as cigarettes. Wetting agents can also be referred to as "aerosol-forming compounds." Aerosol-forming compounds are used to describe any suitable known compound or mixture of compounds that facilitates aerosol formation at the time of use and is substantially resistant to thermal decomposition at the operating temperature of the aerosol-generating substrate. Suitable aerosol-forming compounds are known in the art and include, but are not limited to, polyhydric alcohols (such as propylene glycol, triethylene glycol, 1,3-butanediol, and glycerin), esters of polyhydric alcohols (such as glycerin monoacetate, diacetate, and triacetate), and aliphatic esters of monocarboxylic acids, dicarboxylic acids, or polycarboxylic acids (such as dimethyl dodecanediate and dimethyl tetradecanediate). Preferred aerosol-forming compounds are polyhydric alcohols or mixtures thereof (such as propylene glycol, triethylene glycol, and 1,3-butanediol), and most preferably glycerin or glycerol. The aerosol generating substrate may contain a single aerosol-forming body. Alternatively, the aerosol generating substrate may contain a combination of two or more aerosol-forming bodies.

[0098] The aerosol-generating substrate may have a high level of aerosol-forming material. As used herein, a high level of aerosol-forming material means an aerosol-forming material content of more than about 10% by weight, preferably more than about 15% by weight, or more preferably more than about 20% by weight. The aerosol-generating substrate may also have an aerosol-forming material content of about 10% to about 30% by weight, about 15% to about 30% by weight, or about 20% to about 30% by weight. The aerosol-generating substrate may also have a glycerin content of about 10% to about 30% by weight, about 15% to about 30% by weight, or from about 20% by weight, and about 30% by weight.

[0099] The aerosol generating substrate 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 aerosol-forming material. The aerosol generating substrate may contain aerosol-forming material 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.

[0100] The aerosol generating substrate 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 glycerin. The aerosol generating substrate may contain glycerin 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.

[0101] The gel-form aerosol-generating substrate may contain a large amount of aerosol-forming material, preferably glycerin. The gel composition may contain a gelling agent that forms a solid medium, an aerosol-forming material such as glycerin dispersed in the solid medium, and nicotine dispersed in the glycerin. The composition forms a stable gel phase. The gel composition may contain at least two gelling agents that form a solid medium, glycerin dispersed in the solid medium, and nicotine dispersed in the glycerin. The composition forms a stable gel phase. The gel composition may contain a thickener, a gelling agent that forms a solid medium, glycerin dispersed in the solid medium, and nicotine dispersed in the glycerin. The composition forms a stable gel phase. The gel composition may contain nicotine, an aerosol-forming material, a thickener, a hydrogen-bonding crosslinking gelling agent, and an ion-crosslinking gelling agent. The gel composition may further contain divalent cations.

[0102] The gel composition may contain a large amount of aerosol-forming material such as glycerin. The gel composition may also contain a mixture of water and glycerin, where glycerin forms the majority (by weight) of the gel composition. Glycerin may form at least about 50% by weight of the gel composition. Glycerin may form at least about 60% by weight, or about 65% by weight, or about 70% by weight of the gel composition. Glycerin may be formed in a gel composition of about 70% to about 80% by weight. Glycerin may be formed in a gel composition of about 70% to about 75% by weight.

[0103] The wrappers described herein are placed around an aerosol-generating substrate. The wrappers can reduce the absorption of aerosol-forming compounds and water into the wrapper when air is drawn in through a heated aerosol-generating article.

[0104] Preferably, the aerosol generating article may be generally cylindrical. This allows for a smooth flow of aerosol. The aerosol generating article may have an outer diameter of, for example, 4 to 15 mm, 5 to 10 mm, or 6 to 8 mm. The aerosol generating article may have a length of, for example, 10 to 60 mm, 15 to 50 mm, or 20 to 45 mm.

[0105] The draw-out resistance (RTD) of an aerosol-generating article varies depending, among other things, on the length and dimensions of the passage, the size of the opening, the dimensions of the most contracted cross-sectional area of ​​the internal passage, and the material used. The RTD of an aerosol-generating article may be 50 mmH2O to 140 mmH2O, 60 mmH2O to 120 mmH2O, or 80 mmH2O to 100 mmH2O. The RTD of an article refers to the difference in static pressure between one or more openings and the mouth end of the article when crossing the internal longitudinal passage under steady conditions where the volumetric flow rate at the mouth end is 17.5 ml / second. The RTD of a sample can be measured using the method described in ISO standard 6565:2002.

[0106] All scientific and technical terms used herein have their common meanings in the art unless otherwise specified. The definitions provided herein are intended to facilitate the understanding of certain terms that are frequently used herein.

[0107] As used herein and in the appended claims, the singular forms “a,” “an,” and “the” encompass embodiments having plural subjects, unless otherwise clearly defined by their content.

[0108] As used herein and in the appended claims, the term “or” generally means “and / or,” unless otherwise clearly defined by the context.

[0109] As used herein, “have,” “having,” “include,” “including,” “comprise,” “comprising,” and similar terms are used in an unrestricted sense, generally meaning “include, but not limited to.” Naturally, “consisting essentially of,” “consisting of,” and similar terms are subsumed within “comprising” and similar terms.

[0110] The terms “preferred” and “preferred” refer to embodiments of the present invention that may provide certain advantages under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the enumeration of one or more preferred embodiments does not imply that other embodiments are unhelpful, nor is it intended to exclude other embodiments from the scope of this disclosure, including the claims. [Brief explanation of the drawing]

[0111] [Figure 1] Figure 1 is a schematic cross-sectional view of an aerosol-generating article. [Figure 2] Figure 2 is a schematic cross-sectional view of another aerosol-generating article. [Figure 3] Figure 3 is a schematic cross-sectional view of another aerosol-generating article. [Figure 4] Figure 4 is a schematic cross-sectional view of another aerosol-generating article. [Figure 5] Figure 5 is a schematic cross-sectional view of the aerosol generation system. [Figure 6] Figure 6 is a schematic cross-sectional view of the aerosol generation system. [Modes for carrying out the invention]

[0112] The aerosol-generating articles illustrated in Figures 1 to 4 illustrate one or more embodiments of the aerosol-generating articles or components thereof described above. The schematic diagrams are not necessarily proportional to actual size and are presented for illustrative purposes only, and are not limiting. The drawings illustrate one or more embodiments described in this disclosure. However, other embodiments not illustrated in the drawings are naturally included in the scope and spirit of this disclosure.

[0113] The aerosol generating article 10 in Figure 1 exemplifies an aerosol generating substrate 12 including a cigarette plug, a hollow cellulose acetate tube 14, a polylactic acid filter segment 16, and a mouthpiece segment 18 formed from cellulose acetate material. These four elements are wound individually in paper layers. In particular, the aerosol generating substrate 12 is wound in a first paper layer 50 as described herein. These four elements are arranged in a longitudinal alignment with end to end in contact.

[0114] The aerosol generating substrate 12, the hollow cellulose acetate tube 14, and the polylactic acid filter segment 16 are bonded together and surrounded by a second paper layer 20 to form an intermediate article. The mouthpiece segment 18 is bonded to the intermediate article by chipping paper 25 to form an aerosol generating article 10. The first paper layer 50 and the second paper layer 20 may cooperate to form a wrapper, as described herein.

[0115] The aerosol generating article 10 has a mouth-side end 22 and an upstream distal end 24 located on the opposite end of the article from the mouth-side end 22. The aerosol generating article 10 shown in Figure 1 is particularly suitable for use in an electrically operated aerosol generator that includes a heater for heating the aerosol generating substrate 12.

[0116] The aerosol generating article 100 in Figure 2 comprises four elements arranged in a coaxial alignment: a high draw-to-discharge (RTD) end plug 600 at the distal end 103, a first paper layer 500 surrounding an aerosol generating substrate 124, a fluid guide 400, and a mouthpiece 170 at the 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 or mouth end 101 and a distal end 103 located at the opposite end of the aerosol generating article 100 from the proximal end 101. The first paper layer 500 and the second paper layer 110 cooperate to form a wrapper, as described herein.

[0117] Figure 3 shows a cross-section of an example of an aerosol-generating article 100 that is suitable not only for induction heating but also for heating using a blade-like heating element.

[0118] The aerosol generating article 100 comprises, in order from proximal to distal, a mouthpiece 170 at its proximal end 101, a fluid guide 400, a recess 700, a first paper layer 500 surrounding the aerosol generating substrate 124, and an end plug 600. In this embodiment, the aerosol generating substrate 124 comprises a gel and a susceptor (not shown). In this embodiment, the susceptor is a single aluminum strip located centrally along the long 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), the portion of the aerosol generating article 100 is positioned in close proximity to the induction heating element 230 (see Figure 5) of the aerosol generating device 200 (see Figure 6). The electromagnetic radiation generated by the induction heating element 230 is absorbed by the susceptor and assists in heating the aerosol generating substrate 124 within the first paper layer 500, and then, when negative pressure is applied to the proximal end 101 of the aerosol generating article 100, assists in the release of material from the aerosol generating substrate 124, for example, the release of nicotine entrained into the passing aerosol. A fluid, such as air, enters the outer longitudinal passage 831 through an opening (not shown), moves 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, then returns to the cavity, and then exits at the proximal end 101 via an inner longitudinal passage (not shown) of the fluid guide 400.

[0119] In this embodiment, 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 contain a gel composition.

[0120] The aerosol generating article 100, illustrated in Figures 2 and 3, may be used in conjunction with an aerosol generating device 200, as illustrated in Figures 5 and 6.

[0121] The aerosol generating article 10 in Figure 4 exemplifies 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 wound with a first paper layer 50 as described herein. These four elements are arranged end-to-end and aligned along the longitudinal axis, and 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 may cooperate to form a wrapper as described herein.

[0122] The aerosol generating article 10 has a mouth-side end 22 and an upstream distal end 24 located on the opposite end of the article from the mouth-side end 22. The aerosol generating article 10 shown in Figure 4 is particularly suitable for use in an electrically operated aerosol generator that includes a heater for heating the aerosol generating substrate 12.

[0123] The aerosol generating substrate 12 has a length of approximately 12 millimeters and a diameter of approximately 7 millimeters. The aerosol generating substrate 12 is cylindrical in shape and has a substantially circular cross-section. The aerosol generating substrate 12 comprises an assembly of sheets of homogenized tobacco material. The sheets of homogenized tobacco material contain 10 weight percent glycerin on a dry basis. The hollow cellulose acetate tube 14 has a length of approximately 8 millimeters and a thickness of 1 millimeter. The mouthpiece segment 18 has a plug of cellulose acetate tow with 8 denier per filament and has a length of approximately 7 millimeters.

[0124] The hollow tubular segment 14 is provided as a cylindrical tube having a length of approximately 18 millimeters and a wall thickness of approximately 100 micrometers. The aerosol generating article 10 includes a ventilation zone 26 provided approximately 5 millimeters from the upstream end of the mouthpiece segment 18. Thus, the ventilation zone 26 is located approximately 12 millimeters from the downstream end of the aerosol generating article and approximately 13 millimeters from the upstream end of the hollow tubular segment. Thus, the ventilation zone 26 is located approximately 21 millimeters from the downstream end of the aerosol generating substrate 12.

[0125] Figures 5 and 6 illustrate embodiments of an aerosol generating article 100 and an aerosol generating device 200. The aerosol generating article 100 has a proximal or mouth end 101 and a distal end 103. In Figure 5, the distal end 103 of the aerosol generating article 100 is received in the container 220 of the aerosol generating device 200. The aerosol generating device 200 includes a housing 210 defining the container 220, configured to receive the aerosol generating article 100. The aerosol generating device 200 also includes a heating element 230 that forms a recess 235, preferably configured to receive the aerosol generating article 100 by a tight fit. The heating element 230 may include an electrical resistance 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.

[0126] The heating element 230 may heat the distal end 103 of the aerosol generating article 100. In this embodiment, the aerosol generating substrate 124 contains a nicotine-containing gel. Heating the aerosol generating article 100 causes the aerosol generating substrate 124 to generate a nicotine-containing aerosol, which can then move out of the aerosol generating article 100 at the proximal end 101. The aerosol generating device 200 includes a housing 210. Figures 5 and 6 do not show the exact heating mechanism.

[0127] In some embodiments, the heating mechanism can be by conductive heating, in which heat is transferred from the heating element 230 of the aerosol generator 200 to the aerosol generating article 100. This can be easily done when the aerosol generating article 100 is located within the container 220 of the aerosol generator 200 and the distal end 103 (preferably the end where the aerosol generating substrate 124 is located) and therefore the aerosol generating article 100 is in contact with the heating element 230 of the aerosol generator 200. In certain embodiments, the heating element protrudes from the aerosol generator 200 and comprises a heating blade suitable for penetrating into the aerosol generating article 100 and making direct contact with the aerosol generating substrate 124.

[0128] In this embodiment, the heating mechanism is based on induction, where a heating element emits radiomagnetic radiation absorbed by a tubular element when the aerosol generating article 100 is located inside the container 220 of the aerosol generating device 200.

[0129] When the aerosol generating article 100 is releasably received into the aerosol generating device 200 and onto the heating element 230, the aerosol generating device 200 activates and heats the aerosol generating substrate 124 to a temperature of approximately 375 degrees Celsius. When the user inhales the mouth-side end 101 of the aerosol generating article 100, volatile compounds released from the aerosol generating substrate 124 are drawn downstream through the aerosol generating article 100 and condense to form an aerosol that is drawn into the user's mouth through the mouthpiece 101 of the aerosol generating article 100. The wrappers 500 and 110 repel aerosol-forming substances and moisture from the aerosol, reducing soiling and weakening of the wrappers 500 and 110.

[0130] The first paper layers 50, 500 include a paper layer having a thickness / basis weight of approximately 1.2 micrometers / gsm or less. Preferably, the first paper layers 50, 500 have a thickness / basis weight in the range of approximately 1.0 micrometers / gsm to approximately 1.2 micrometers / gsm. The first paper layers 50, 500 may have a thickness of less than approximately 50 micrometers or less than approximately 40 micrometers. The first paper layers 50, 500 may have a basis weight in the range of approximately 25 gsm to approximately 45 gsm or approximately 35 gsm to approximately 40 gsm.

[0131] The first paper layers 50, 500 preferably have a thickness / basis weight of about 1.2 micrometers / gsm or less and a water contact angle of at least about 30 degrees. The first paper layers 50, 500 may have a water contact angle of at least about 40 degrees, or at least about 45 degrees.

[0132] The first paper layers 50, 500 preferably have a thickness / basis weight of about 1.2 micrometers / gsm or less and a CD / MD elongation ratio of about 2.5 or less. The first paper layers 50, 500 may also have a CD / MD elongation ratio of about 2.2 or less, or about 2 or less.

[0133] Preferably, the first paper layers 50, 500 have a thickness / basis weight of about 1.2 micrometers / gsm or less and preferably have a negative result for at least one kit oil sample of Method Tappi 559cm-02 Classical Method 2002. The first paper layers 50, 500 may also have negative results for at least five kit oil samples, or all ten kit oil samples, of Method Tappi 559cm-02 Classical Method 2002.

[0134] The wrapper comprises first paper layers 50, 500 and second paper layers 20, 110, wherein the first paper layers 50, 500 have a first thickness / grammage value, and the second paper layers 20, 110 have a second thickness / grammage value, and preferably the first thickness / grammage value is smaller than the second thickness / grammage value. The first thickness / grammage value may be less than 1.2 micrometers / gsm, and the wrapper may have a total thickness of less than about 80 micrometers.

[0135] The first paper layers 50, 500 preferably contain PVOH (polyvinyl alcohol) or silicone. The first paper layers 50, 500 may also include a surface treatment containing PVOH or silicone. The addition of PVOH (polyvinyl alcohol) or silicone may improve the grease barrier properties of the wrapper.

[0136] The second paper layers 20 and 110 preferably contain PVOH (polyvinyl alcohol) or silicone. The second paper layers 20 and 110 may also include a surface treatment containing PVOH or silicone. The addition of PVOH (polyvinyl alcohol) or silicone may improve the grease barrier properties of the wrapper.

[0137] 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. Furthermore, this specification includes at least the following: (1) Articles that generate aerosols, an aerosol generating substrate containing at least about 10% aerosol-forming material including nicotine and glycerin, An aerosol generating article comprising: a wrapper disposed around and in contact with the aerosol generating substrate, the wrapper comprising a paper layer having a thickness / basis weight of about 1.2 micrometers / gsm or less; and a wrapper disposed around the aerosol generating substrate and in contact with the aerosol generating substrate. (2) The aerosol generating article according to (1) above, wherein the paper layer has a thickness / basis weight in the range of about 1.0 micrometers / gsm to about 1.2 micrometers / gsm. (3) The aerosol generating article according to any one of (1) to (2) above, wherein the paper layer has a thickness of less than about 50 micrometers or less than about 40 micrometers. (4) The aerosol generating article according to any one of (1) to (3) above, wherein the paper layer has a basis weight in the range of approximately 25 gsm to approximately 45 gsm, or approximately 35 gsm to approximately 40 gsm. (5) The aerosol generating article according to any one of (1) to (4) above, wherein the paper layer contains PVOH or silicon. (6) The aerosol generating article according to any one of (1) to (5) above, wherein the paper layer includes a surface treatment containing PVOH or silicon. (7) The aerosol generating article according to any one of (1) to (6) above, wherein the paper layer contains PVOH. (8) The aerosol generating article according to any one of (1) to (7) above, wherein the paper layer contains silicon. (9) The aerosol generating article according to any one of (1) to (8) above, wherein the aerosol generating substrate comprises a gel composition. (10) The aerosol generating article according to (9) above, wherein the gel composition contains a large amount of glycerin. (11) The aerosol generating article according to (10) above, wherein the gel composition contains xanthan gum. (12) An aerosol generating article according to any one of (1) to (11) above, comprising a homogenized tobacco material as the aerosol generating substrate. (13) The aerosol generating article according to (12) above, wherein the homogenized tobacco material comprises, on a dry mass basis, the tobacco material, about 1 percent to about 5 percent of a binder, and about 5 percent to about 30 percent of an aerosol forming body. (14) The aerosol generating article according to any one of (1) to (13) above, wherein the aerosol generating substrate includes a metal induction heating element. (15) The aerosol generating article according to any one of (1) to (14) above, wherein the aerosol generating substrate includes a plurality of metal induction heating elements.

Claims

1. A heating-type non-combustion aerosol generating article, an aerosol generating substrate containing at least about 10% aerosol-forming material including nicotine and glycerin, An aerosol generating article comprising a wrapper disposed around the aerosol generating substrate, the wrapper comprising a paper layer having a thickness / basis weight of about 1.2 micrometers / gsm or less, wherein the paper layer includes a surface treatment containing siloxane.

2. The aerosol generating article according to claim 1, wherein the paper layer has a thickness / basis weight in the range of about 1.0 micrometers / gsm to about 1.2 micrometers / gsm.

3. The aerosol generating article according to any one of claims 1 to 2, wherein the paper layer has a thickness of less than about 50 micrometers or less than about 40 micrometers.

4. The aerosol generating article according to any one of claims 1 to 3, wherein the paper layer has a basis weight in the range of about 25 gsm to about 45 gsm, or about 35 gsm to about 40 gsm.

5. The aerosol generating article according to any one of claims 1 to 4, wherein the paper layer contains polyvinyl alcohol.

6. The aerosol generating article according to any one of claims 1 to 5, wherein the aerosol generating substrate comprises a gel composition, preferably the gel composition comprises a large amount of glycerin, and more preferably the gel composition comprises xanthan gum.

7. The aerosol generating article according to any one of claims 1 to 6, wherein the aerosol generating substrate comprises a homogenized tobacco material, preferably the homogenized tobacco material comprising, on a dry mass basis, a tobacco material, about 1% to about 5% of a binder, and about 5% to about 30% of an aerosol forming body.

8. The aerosol generating article according to any one of claims 1 to 7, wherein the aerosol generating substrate includes a metal induction heating element.

9. The aerosol generating article according to any one of claims 1 to 8, wherein the aerosol generating substrate includes a plurality of metal induction heating elements.

10. The aerosol generating article according to any one of claims 1 to 9, wherein the wrapper comprises a first paper layer and a second paper layer, and only one of the first paper layer and the second paper layer comprises a surface treatment containing polyvinyl alcohol or siloxane.

11. The aerosol generating article according to any one of claims 1 to 10, wherein the wrapper comprises a first paper layer and a second paper layer, and both the first paper layer and the second paper layer are subjected to a surface treatment containing polyvinyl alcohol or siloxane.

12. The aerosol generating article according to claim 10, wherein the second paper layer separates the first paper layer from the aerosol generating substrate, and only the first paper layer includes a surface treatment containing polyvinyl alcohol or siloxane.

13. The aerosol generating article according to claim 10, wherein the first paper layer separates the second paper layer from the aerosol generating substrate, and only the first paper layer includes a surface treatment containing polyvinyl alcohol or siloxane.

14. The aerosol generating article according to any one of claims 1 to 13, further comprising a mouthpiece segment or a hollow tube segment arranged together with the aerosol generating substrate in a longitudinal alignment with end to end, wherein the wrapper surrounds both the aerosol generating substrate and at least one of the mouthpiece segment or the hollow tube segment.

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