JP2022536466A - Stable wrapper for aerosol-generating articles - Google Patents

Abstract

An aerosol-generating article (10) comprising an aerosol-generating substrate (12) comprising nicotine and a wrapper (50) 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. [Selection drawing] Fig. 1

Description

The present disclosure relates to wrappers used in aerosol-generating articles, which wrappers have high paper densities and may be utilized with aerosol-generating substrates.

Aerosol-generating articles in which an aerosol-generating substrate, such as a tobacco-containing substrate, is heated rather than combusted are known in the art. Typically, in such heated aerosol-generating articles, the aerosol is in a physically separated body that may be in contact with the heat source, within the heat source, around the heat source, or downstream of the heat source. It is generated by transferring heat from a heat source to an aerosol-generating substrate or material. During use of the aerosol-generating article, the 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.

The paper used to wrap the aerosol-generating substrate absorbs aerosol formers, water, and other liquid compounds found in mainstream smoke or aerosols passing through the aerosol-generating article, or moisture or moisture present around the paper. be able to. Absorbed liquids can stain 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 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 swelling when the aerosol component is 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 securely received and then removed from the heating device.

It would be desirable to provide a rolled aerosol-generating substrate that is visually and mechanically stable, especially for aerosol-generating articles containing high levels of liquid formers or aerosol formers.

It would be 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.

It would be desirable to provide an aerosol-generating article that includes a wrapper that provides a grease barrier to grease compounds contained in the aerosol-generating substrate.

It would also be desirable for the wrapper not to affect the taste of the aerosol generated by the aerosol-generating article.

It would also be desirable that the wrapper not readily burn when in close proximity to the heating element.

An object of the present invention may be to solve, at least in part, one or more of the desirable technical advantages set forth above.

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

According to the present disclosure, an aerosol-generating substrate comprising nicotine and at least about 10% aerosol former (including glycerin) and a wrapper disposed around and in contact with the aerosol-generating substrate. Goods are provided. The wrapper comprises a paper layer having a thickness/basis weight of about 1.2 micrometers/gsm or less.

According to the present disclosure, an aerosol-generating article is provided. The aerosol-generating article may comprise an aerosol-generating substrate. The aerosol-generating substrate may include a wrapper. A wrapper may be 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.

The paper layer preferably has a thickness/basis weight within 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 microns, or less than about 40 microns. The wrapper includes a paper layer having a basis weight within the range of about 25 gsm to about 45 gsm, or about 35 gsm to about 40 gsm.

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 have a water contact angle of at least about 40 degrees, or at least about 45 degrees.

The term "MD" refers to the machine direction of the wrapper. The machine direction is the direction in which paper stock flows into and through the papermaking machine. The machine direction is the circumferential direction of the roll of paper unwound from the paper machine. The machine direction is also sometimes called the grain direction.

The term "CD" refers to the cross direction of the wrapper. The lateral direction of the wrapper is the in-plane direction of the wrapper. The cross direction of the wrapper is orthogonal to the machine direction of the wrapper.

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

The wrapper has a thickness/basis weight of about 1.2 micrometers/gsm or less and a paper layer having a negative result for at least one kit oil sample of Method Tappi 559 cm-02 Classical Method 2002. It is preferable to have The paper layer may have a negative result for at least 5 kit oil samples of Method Tappi 559cm-02 Classical Method 2002, or for all 10 kit oil samples.

The wrapper includes two paper layers, a first paper layer having a first thickness/basis weight value and a second paper layer having a second thickness/basis weight value, and Preferably, the first thickness/basis weight value is less than the second thickness/basis weight value. The first thickness/basis weight value may be less than 1.2 micrometers/gsm, and the wrapper may have a total thickness of less than about 80 micrometers.

The paper layer preferably contains PVOH (polyvinyl alcohol) or silicone. The paper layer may include surface treatments including PVOH or silicone. Addition of PVOH (polyvinyl alcohol) or silicone may improve the grease barrier properties of the wrapper.

The term "silicon" refers to siloxane. Preferably, the silicone or siloxane comprises polydimethylsiloxane.

Preferably, the aerosol-generating substrate may comprise homogenized tobacco material. A tobacco homogenized tobacco material may comprise, on a dry weight basis, tobacco material, about 1% to about 5% binder, and about 5% to about 30% aerosol former.

Preferably, the aerosol-generating substrate may comprise a gel composition. The gel composition may contain a large amount (by weight) of glycerin. The gel composition may contain xanthan gum.

Preferably, the aerosol-generating substrate may comprise 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.

The wrapper may be formed from a single paper ply. The wrapper may be formed from two paper layers. The wrapper may be formed from three or more layers of paper.

Preferably, the wrapper covers at least 20%, at least 50%, at least 80%, at least 90%, at least 95%, at least 99%, or preferably nearly the entire length (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.

If the wrapper has two or more paper layers, the first paper layer may have the unique properties described herein and the second paper layer is considered a conventional paper layer. may The second paper layer may preferably be arranged outside the first paper layer. Alternatively, the first paper layer may be placed outside the second paper layer. A first paper layer having the unique properties described herein is preferably in contact with the aerosol-forming substrate.

If 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. may have the properties of All paper layers forming the wrapper may have unique properties as described herein. In particular, one or both paper layers forming the wrapper may comprise PVOH (polyvinyl alcohol) or silicone. One or both paper layers forming the wrapper may include surface treatments including PVOH or silicone.

Advantageously, an aerosol-generating article comprising a wrapper as described herein may reduce absorption of wetting, water, aerosol formers, or grease in smoke or aerosol passing through the aerosol-generating article. As a result, swelling, visible fouling, and physical weakening of the wrapper portion of the aerosol-generating article may be reduced, even when high levels of aerosol formers are included in the aerosol-generating substrate.

Advantageously, the aerosol-generating article provides a visually and mechanically stable rolled aerosol-generating substrate that avoids expansion. This is particularly useful for heated non-combustible aerosol-generating articles that may be inserted into a heating device. The aerosol-generating article wrapper resists combustion when in close proximity to the heating element, so the induction heating element may be incorporated throughout the aerosol-generating substrate.

The term "aerosol-generating article" is used herein to mean an article in which an aerosol-generating substrate is heated to generate and deliver an inhalable aerosol to a consumer. As used herein, the term "aerosol-generating substrate" means a substrate capable of releasing a volatile compound upon heating to generate an aerosol.

A conventional cigarette is lit when a user places a flame on one end of the cigarette and draws air through the other end. The localized heat provided by the flame and the oxygen in the air drawn through the cigarette causes the ends 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 the 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 aerosol is generated by the transfer of heat from a combustible fuel element or heat source to a physically separate aerosol-forming substrate. and For example, aerosol-generating articles according to the present disclosure find particular application in aerosol-generating systems comprising electrically heated aerosol-generating devices having internal heater blades adapted to be inserted into rods of aerosol-generating substrates. be. Aerosol-generating articles of this type are described in the prior art, for example in EP0822670.

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

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

The term "aerosol-generating substrate" refers to a material capable of generating or emitting an aerosol. Aerosol-generating substrates may be solids, pastes, gels, slurries, liquids, or may comprise any combination of solids, pastes, gels, slurries, and liquid compounds. Preferably, the aerosol-generating substrate is a solid or gel composition. The aerosol-generating substrate may preferably contain nicotine.

The aerosol-generating article may comprise an aerosol-generating substrate and a mouthpiece. The mouthpiece may be equipped with a filter. A tipping wrapper may bond the filter to the aerosol-generating substrate.

The aerosol-generating substrate may be a solid composition. The composition may include plant-based material. The aerosol-generating substrate may comprise tobacco, and tobacco preferably contains volatile tobacco flavor compounds that are released from the aerosol-generating substrate upon heating. The aerosol-generating substrate may comprise a homogenized tobacco material, an aerosol former, and a binder.

Nicotine may be present in the aerosol-generating substrate within the range of about 0.5 to about 10 weight percent nicotine, or about 0.5 to about 5 weight percent nicotine. Preferably, the aerosol-generating substrate may comprise from about 1 to about 3 weight percent nicotine, or from about 1.5 to about 2.5 weight percent nicotine, or from about 2 weight percent nicotine.

The aerosol-generating substrate may contain flavorants. The plant material provides flavoring agents that may impart flavor to the taste of the aerosol generated by the aerosol-generating article. A flavoring agent is any natural or man-made compound that affects the organoleptic qualities of an aerosol. Non-limiting examples of sources of flavoring agents include mints (such as peppermint and spearmint), coffee, tea, cinnamon, cloves, cocoa, vanilla, eucalyptus, geranium, agave, and juniper, and combinations thereof. .

The aerosol-generating substrate may comprise essential oils. Essential oils may provide flavorants that may impart flavor to the taste of the aerosol generated by the aerosol-generating article. Suitable essential oils include, but are not limited to, eugenol, peppermint oil, and spearmint oil. A preferred essential oil is eugenol. The essential oil may be present in the aerosol-generating substrate in an amount of at least about 0.1 wt%, or at least about 0.5 wt%, or at least about 1 wt%. The essential oil is present in the aerosol-generating substrate within the range of about 0.1% to about 10%, or about 0.1% to about 5%, or about 0.5% to about 2% by weight. may

The aerosol-generating substrate may comprise a gel composition. The term "gel" refers to a solid at room temperature. "Solid" in this context means that the gel has a stable size and shape and does not flow. Room temperature in this context means 25 degrees Celsius. A gel may be defined as a substantially dilute system that exhibits no flow at steady state. On a weight basis, gels can be mostly liquid, yet they behave like solids due to the three-dimensional crosslinked network within the liquid. Cross-linking within the fluid gives the gel its structure (hardness). Thus, a gel may be a dispersion of liquid molecules within a solid with liquid particles dispersed within a solid medium.

The gel composition may comprise a gelling agent forming a solid medium, an aerosol former such as glycerine dispersed in the solid medium, and nicotine dispersed in the glycerine. The composition forms a stable gel phase. The gel composition may comprise at least two gelling agents forming a solid medium, glycerine dispersed in the solid medium, and nicotine dispersed in the glycerine. The composition forms a stable gel phase. The gel composition may include a thickening agent and a gelling agent forming a solid medium, glycerin dispersed in the solid medium, and nicotine dispersed within the glycerin. The composition forms a stable gel phase. The gel composition may include nicotine, an aerosol former, a thickening agent, a hydrogen bonding cross-linked gelling agent, and an ionically cross-linked gelling agent. The gel composition may further contain divalent cations.

The term "thickener" means that when added uniformly in an amount of 0.3% by weight into a mixture of 50% by weight water/50% by weight glycerin at 25° C., it results in the formation of a gel. Refers to compounds that increase the viscosity without causing the mixture to remain or remain fluid. Preferably, the thickening agent, 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., at a shear rate of 0.1 s , increase the viscosity by at least 50 cPs, preferably by at least 200 cPs, preferably by at least 500 cPs, preferably by at least 1000 cPs, without causing the formation of a gel, and the mixture remains or remains fluid. refers to a compound that Preferably, the thickening agent, 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., at a shear rate of 0.1 s increase the viscosity at least 2-fold, or at least 5-fold, or at least 10-fold, or at least 100-fold higher than before the addition without resulting in the formation of a gel; the mixture remains or remains fluid; Refers to a compound that becomes

Viscosity values recited herein may be measured using a Brookfield RVT viscometer with a disc type RV#2 spindle rotating at 6 revolutions per minute (rpm) at 25°C. can.

The term "gelling agent" forms a solid medium or support matrix that leads to a uniform gel when added to a mixture of 50% water/50% glycerin in an amount of about 0.3% by weight. It refers to a compound that causes Gelling agents include, but are not limited to, hydrogen bonding cross-linked gelling agents, and ionically cross-linked gelling agents.

The term "hydrogen-bonding cross-linking gelling agents" refers to gelling agents that form non-covalent or physical cross-linking via hydrogen bonding. Hydrogen bonding is a type of electrostatic dipole-dipole attraction between molecules rather than covalent bonding to hydrogen atoms. This results from the attractive force between a hydrogen atom covalently bonded to another extremely electronegative atom, such as an N, O, or F atom.

The term "ionically cross-linked gelling agent" refers to a gelling agent that forms non-covalent or physical cross-links through ionic bonds. Ionic cross-linking involves the association of polymer chains through non-covalent interactions. A crosslinked network is formed when multivalent molecules with opposite charges are electrostatically attracted to each other to produce a crosslinked polymer network.

The gel composition includes an aerosol former. Ideally, the aerosol former is substantially resistant to thermal decomposition at the operating temperatures of the associated aerosol generator. Suitable aerosol formers include polyhydric alcohols (such as triethylene glycol, 1,3-butanediol, glycerin), esters of polyhydric alcohols (such as glycerin monoacetate, diacetate, or triacetate), and monocarboxylic acids, Dicarboxylic acids, or aliphatic esters of polycarboxylic acids, such as dimethyl dodecanedioate, dimethyl tetradecanedioate, etc., include, but are not limited to. The polyhydric alcohol or mixture thereof may be triethylene glycol, 1,3-butanediol and one or more of glycerin (glycerin or propane-1,2,3-triol) or polyethylene glycol. Preferably, the aerosol former is glycerin.

The gel composition may contain large amounts of aerosol formers such as glycerin. The gel composition may comprise 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%, or about 65%, or about 70% by weight of the gel composition. Glycerin may form in about 70% to about 80% by weight of the gel composition. Glycerin may form in about 70% to about 75% by weight of the gel composition.

Preferably, the gel composition contains no water or only low levels of water. When the gel composition contains no water or only low levels of water, the gel composition may contain higher levels of aerosol formers, gelling agents, thickeners, and other compounds such as nicotine. It's okay. Also, gel compositions that contain no water or low levels of water are also simpler and require less energy to vaporize. Aerosols formed from gel compositions that contain no water or low levels of water may be perceived by the user as less hot. The gel composition preferably contains less than about 40% water, preferably less than about 30% water, and preferably less than about 25% water by weight. The gel composition may contain less than about 20% water, or less than about 15% water, or less than about 10% water, or less than about 5% water. It may be preferred that the gel composition contains some water. A gel composition is more stable if the composition contains some water. Preferably, the gel composition comprises at least about 1% by weight, or at least about 2% by weight, or at least about 5% by weight water. Preferably, the gel composition contains at least about 10% by weight, or at least about 15% by weight water. Preferably, the gel composition contains water within the range of about 15% to about 25% by weight.

The gel composition may include gelling agents that are hydrogen bonding cross-linking gelling agents and ionically cross-linking gelling agents. The gel composition may further contain a thickening agent. The gelling agent may form a solid medium in which the aerosol former may be dispersed. The gelling agent may form a solid medium in which the aerosol former and water may be dispersed. The thickener in combination with the hydrogen-bonding cross-linking gelling agent and the ionically cross-linking gelling agent surprisingly support the solid medium and improve the gel composition even when the gel composition contains high levels of glycerin. is expected to maintain

The gel composition may contain a gelling agent within the range of about 0.4% to about 10% by weight. Preferably, the composition may contain gelling agents within the range of about 0.5% to about 8% by weight. Preferably, the composition may contain gelling agents within the range of about 1% to about 6% by weight. Preferably, the composition may contain gelling agents within the range of about 2% to about 4% by weight. Preferably, the composition may contain gelling agents within the range of about 2% to about 3% by weight.
The gel composition may contain a thickening agent within the range of about 0.2% to about 5% by weight. Thickeners within the range of about 0.5% to about 3% by weight are preferred. Thickeners within the range of about 0.5% to about 2% by weight are preferred. Thickeners within the range of about 1% to about 2% by weight are preferred.

The gel composition may comprise a thickening agent, a hydrogen bonding cross-linking gelling agent, and an ionically cross-linking gelling agent present in the gel composition in a total amount of about 1% to about 8% by weight. Preferably, the gel composition may comprise a thickening agent, a hydrogen bonding cross-linked gelling agent, and an ionically cross-linked gelling agent present in the gel composition in a total amount of about 2% to about 6% by weight. . Preferably, the gel composition may comprise a thickening agent, a hydrogen bonding cross-linked gelling agent, and an ionically cross-linked gelling agent, present in the gel composition in a total amount of about 3% to about 5% by weight. .

The gel composition comprises a thickening agent, a hydrogen bonding cross-linking gelling agent, and an ionically cross-linking gelling agent, each independently present in the gel composition in the range of about 0.3% to about 3% by weight. may contain. Preferably, the gel composition comprises a thickening agent, a hydrogen bonding cross-linking gelling agent, and an ion cross-linking gel, each independently present in the gel composition within the range of about 0.5% to about 2% by weight. It may also contain an agent. Preferably, the gel composition comprises a thickening agent, a hydrogen bonding cross-linking gelling agent, and an ionic cross-linking gelling agent, each independently present in the gel composition in the range of about 1% to about 2% by weight. may include

Thickeners may include one or more of xanthan gum, carboxymethylcellulose, microcrystalline cellulose, methylcellulose, gum arabic, guar gum, lambda carrageenan, or starch. It may be preferred that the thickening agent comprises xanthan gum.

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

The hydrogen-bonding cross-linking gelling agent may comprise one or more of galactomannan, gelatin, agarose, or konjac gum, or agar. It may be preferred that the hydrogen-bonding cross-linking gelling agent comprises agar.

The gel composition may comprise a hydrogen bonding cross-linking gelling agent (such as agar) in the range of about 0.3% to about 5% by weight. Preferably, the composition may contain within the range of about 0.5% to about 3% by weight of the hydrogen-bonding cross-linking gelling agent. Preferably, the composition may contain within the range of about 1% to about 2% by weight of the hydrogen bonding cross-linking gelling agent.

Ionically crosslinked gelling agents may include low acyl gellan, pectin, kappa carrageenan, iota carrageenan or alginate. It may be preferred that the ionically crosslinked gelling agent comprises low acyl gellan.

The gel composition may comprise an ionically crosslinked gelling agent (such as low acyl gellan) in the range of about 0.3% to about 5% by weight. Preferably, the composition may comprise within the range of about 0.5% to about 3% by weight of the ionically crosslinked gelling agent. Preferably, the composition may contain within the range of about 1% to about 2% by weight of the ionically crosslinked gelling agent.

The gel composition may further contain divalent cations. Preferably, the divalent cations may include calcium ions such as calcium lactate in solution. Divalent cations (such as calcium ions) may assist gel formation in compositions comprising gelling agents, such as, for example, ionically cross-linked gelling agents. Ionic effects may assist gel formation. Divalent cations may be present in the gel composition in the range of about 0.1 to about 1 weight percent, or about 0.5 weight percent.

The gel composition may further contain an acid. Acids may include carboxylic acids. 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 over even similar carboxylic acids. Carboxylic acids may assist in gel formation. Carboxylic acids may reduce the change in nicotine concentration within the gel composition during storage.

The gel composition may contain a carboxylic acid (such as lactic acid) within the range of about 0.1% to about 5% by weight. Preferably, the carboxylic acid may be in the range of about 0.5% to about 3% by weight. Preferably, the carboxylic acid may be in the range of about 0.5% to about 2% by weight. Preferably, the carboxylic acid may be in the range of about 1% to about 2% by weight.

Nicotine is included within the gel composition. Nicotine may be added to the composition in free base form or salt form. The gel composition may contain from about 0.5 to about 10% by weight nicotine, or from about 0.5 to about 5% by weight nicotine. Preferably, the gel composition may contain about 1 to about 3% nicotine, or about 1.5 to about 2.5% nicotine, or about 2% nicotine by weight. 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.

The aerosol-generating system includes a heat source, an aerosol-generating substrate, at least one air inlet downstream of the aerosol-generating substrate, and an airflow path extending between the at least one air inlet and a mouth end of the article. You may prepare. Preferably, the heat source is upstream of the aerosol-generating substrate. The heat source may be integral with the aerosol-generating device, and the consumable aerosol-generating article may be releasably received within the aerosol-generating device.

The heat source may be a combustible heat source, a chemical heat source, an electrical heat source, a heat sink, or any combination thereof. The heat source may be an electrical heat source, preferably shaped in the form of a blade that can be inserted into the aerosol-generating substrate. Alternatively, the heat source may be configured to surround the aerosol-generating substrate, and thus may be in the form of a hollow cylinder, or any other such suitable form. Alternatively, the heat source is a combustible heat source. As used herein, a combustible heat source is a heat source that, in use, burns itself to generate heat, but unlike cigarettes, cigars, or cigarillos, the aerosol-generating substrate Combustion is not involved. The combustible heat source may comprise carbon and ignition aids such as metal peroxides, superoxides, or nitrates, where the metal is an alkali or alkaline earth metal.

The aerosol-generating substrate may include an induction heating element or susceptor, or multiple induction heating elements or susceptors. An induction heating element or susceptor heats in the presence of an alternating or fluctuating electromagnetic field. When heating is by induction heating, the fluctuating electromagnetic field is transmitted through the aerosol-generating article to an induction heating element or susceptor, which converts the fluctuating field into thermal energy and thus the aerosol-generating substrate. to heat.

The induction heating element or susceptor may be formed from any material that can be inductively heated to a temperature sufficient to generate an aerosol from the aerosol-generating substrate. The induction heating element or susceptor may contain metal or carbon. A preferred induction heating element or susceptor may comprise a ferromagnetic material (eg ferritic iron), or ferromagnetic steel or stainless steel. The induction heating element or susceptor may comprise aluminum. The induction heating element or susceptor may be formed from 400 series stainless steel, such as grade 410, or grade 420, or grade 430 stainless 20 steel. Different materials dissipate different amounts of energy when placed in electromagnetic fields having similar values of frequency and field strength. The induction heating element or susceptor is preferably heated to a temperature in excess of 250 degrees Celsius. However, the induction heating element or susceptor is preferably heated to less than 350 degrees Celsius to prevent burning of materials in contact with the susceptor.

An induction heating element or susceptor may be located in close proximity to the wrapper of the aerosol-generating substrate as the wrappers described herein advantageously resist combustion.

The term "mouthpiece" is used herein to indicate the portion of the aerosol-generating article that is designed to contact the consumer's mouth. The mouthpiece may be part of the aerosol-generating article, which may include a filter, or in some cases the mouthpiece may be defined by the extent of the tipping wrapper. In other cases, the mouthpiece can be defined as a portion of the aerosol-generating article that extends about 40 mm from the mouth end of the aerosol-generating article, or that extends about 30 mm from the mouth-side end of the aerosol-generating article.

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

The terms "wrapper" or "paper wrapper" are interchangeable and a wrapping formed of paper to contain the aerosol-generating substrate or surround the aerosol-generating substrate to maintain the shape of the aerosol-generating article. Refers to one or more layers of material. The wrapper reduces staining on the exterior surface of the aerosol-generating article. The wrapper preferably contacts the aerosol-generating substrate.

The term "hydrophobic" refers to surfaces that exhibit water-repellent properties. One useful way to determine this is to measure the water contact angle. A "water contact angle" is the angle at which a liquid/vapor interface meets a solid surface, conventionally measured through a liquid. It quantifies the wettability of a solid surface by a liquid via Young's equation.
FIELD OF THE DISCLOSURE The present disclosure relates to wrappers used in aerosol-generating articles, the wrappers having a paper layer with high density and may be utilized with aerosol-generating substrates. According to the present disclosure, an aerosol-generating article is provided that includes an aerosol-generating substrate comprising 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.

The wrapper preferably comprises a paper layer having a thickness/basis weight within the range of about 0.8 micrometers/gsm to about 1.2 micrometers/gsm. The paper layer may have a thickness/basis weight within the range of about 1.0 micrometers/gsm to about 1.2 micrometers/gsm. The paper layer may have a thickness/basis weight of about 1.0 micrometer/gsm. The paper layer may have a thickness/basis weight of about 0.9 micrometers/gsm. The paper layer may have a thickness/basis weight of about 1.0 micrometer/gsm. The paper layer may have a thickness/basis weight of about 1.1 micrometers/gsm. The paper layer may have a thickness/basis weight of about 1.2 micrometers/gsm.

The paper layer may have a thickness of less than about 50 microns, or less than about 40 microns. The paper layer may have a thickness within the range of about 10 microns to about 50 microns. The paper layer may have a thickness within the range of about 20 micrometers to about 50 micrometers. The paper layer may have a thickness within the range of about 30 microns to about 50 microns. The paper layer may have a thickness within the range of about 35 micrometers to about 50 micrometers. The paper layer may have a thickness within the range of about 35 micrometers to about 40 micrometers. The paper layer may have a thickness within the range of about 40 microns to about 50 microns.
The paper layer may have a basis weight within the range of about 25 gsm to about 45 gsm. The paper layer may have a basis weight within the range of about 30 gsm to about 45 gsm. The paper layer may have a basis weight within the range of about 35 gsm to about 45 gsm. The paper layer may have a basis weight within the range of about 35 gsm to about 40 gsm.

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

The paper layer preferably contains 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 placed on the outer surface of the paper layer of the aerosol-generating article. The PVOH may be placed on and form a layer on the outer 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. The PVOH may be placed on and form a layer on the inner surface of the paper layer of the aerosol-generating article. PVOH may be placed on the inner and outer surfaces of the paper layer of the aerosol-generating article. The PVOH may be placed on and layered on the inner and outer surfaces of the paper layer of the aerosol-generating article.

The paper layer may include surface treatments including PVOH or silicone. The paper layer may include a surface treatment including PVOH. The paper layer may include a surface treatment including 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 the outer and inner surfaces of the paper layer. Addition of PVOH or silicone may improve the grease barrier properties of the paper layer.

The aerosol-generating substrate may comprise a gel composition. The gel composition may contain large amounts of aerosol formers such as glycerin. The gel composition comprises nicotine, at least about 50% by weight glycerin or at least 70% by weight glycerin, at least about 0.2% by weight hydrogen bonding cross-linked gelling agent, at least about 0.2% by weight ionically cross-linked gelling agent. , and at least about 0.2% by weight thickening agent. The gel composition may contain xanthan gum.

The aerosol-generating substrate may comprise homogenized tobacco material. A tobacco homogenized tobacco material may comprise, on a dry weight basis, tobacco material, about 1% to about 5% binder, and about 5% to about 30% aerosol former.

The aerosol-generating substrate may comprise 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.

The wrappers described herein are intended to reduce and may prevent the formation of stains on consumer-visible aerosol-generating articles. It has been observed that stains can appear on aerosol-generating articles with storage in humid environments or during consumption. Staining can be caused by absorption of water or aerosol formers containing either colored substances suspended or dissolved into the web of cellulosic fibers that make up the wrapper. Without being bound by any theory, the water or aerosol former interacts with the cellulosic fibers of the paper and changes the texture of the fibers, resulting in changes in brightness, color, opacity, etc. It produces local changes in optical properties as well as mechanical properties such as tensile strength, permeability, etc. of the wrapper.

It is contemplated that the wrappers described herein reduce and may prevent expansion of the aerosol-generating article. Reducing or preventing expansion of the aerosol-generating article improves the usability of the aerosol-generating article, such as reliably inserting and removing the aerosol-generating article from a heating device without damaging the aerosol-generating article.

A wrapper is the portion of the aerosol-generating article that is placed 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 aerosol-generating substrate. Preferably, the wrapper contains the aerosol-generating substrate over at least about 90% of the length of the plug of aerosol-generating substrate. More preferably, the wrapper contains the aerosol-generating substrate over at least about 100% of the length of the plug of aerosol-generating substrate.

The 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 reported in cubic centimeters per minute per square centimeter, referred to as "Coresta Units." The permeability of the wrappers described herein may be in the range of about 1 to about 10 Coresta units, about 5 to about 20 Coresta units, or about 1 to about 5 Coresta units.

Wrappers may be formed from any cellulosic material such as paper, wood, fabric, natural and man-made fibers. The wrapper preferably does not contain fillers such as calcium carbonate. Preferably, the wrapper is formed from at least 90% by weight cellulosic material. Preferably, the wrapper is formed from at least 95% by weight cellulosic material.

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

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. Hydrophobicity or water contact angle was determined utilizing the TAPPI T558 test, and results are presented as interfacial contact angles, also reported in "degrees" and can range from approximately 0 degrees to approximately 180 degrees. can.

The paper layer may have an elongation to break ratio of CD/MD of about 2.5 or less. The paper layer may have an elongation to break ratio of CD/MD of about 2.2 or less, or about 2 or less. The term "MD" refers to the machine direction of the paper ply. The machine direction is also sometimes referred to as the grain direction of the paper ply. The term "CD" refers to the cross direction of the paper ply, perpendicular to the machine direction of the paper ply.

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 5 kit oil samples of Method Tappi 559cm-02 Classical Method 2002, or for all 10 kit oil samples.

The wrapper may include two paper layers, a first paper layer having a first thickness/basis weight value and a second paper layer having a second thickness/basis weight value. , and the first thickness/basis weight value is less than the second thickness/basis weight value. The first thickness/basis weight value may be less than 1.2 micrometers/gsm and the wrapper has a total thickness of less than about 80 micrometers.

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

The wrapper may comprise two paper layers, the first layer in contact with the aerosol-forming substrate and the second layer overlying the first layer and forming the outer surface of the aerosol-forming article. The first layer may have a first thickness/basis weight value of less than 1.2 micrometers/gsm and the second layer may have a second thickness of less than 1.2 micrometers/gsm. It may have a thickness/basis weight value.

The wrapper may comprise two layers of paper, the first layer in contact with the aerosol-forming substrate and the second layer overlying the first layer. The first layer may comprise PVOH (polyvinyl alcohol) or silicone, or may comprise a surface treatment comprising PVOH or silicone. The second layer may comprise PVOH (polyvinyl alcohol) or silicone, or may comprise a surface treatment comprising PVOH or silicone. Both the first and second layers may contain PVOH (polyvinyl alcohol) or silicon, or may contain a surface treatment containing PVOH or silicon. Only the first layer may contain PVOH (polyvinyl alcohol) or silicon, or may contain a surface treatment containing PVOH or silicon. Only the second layer may contain PVOH (polyvinyl alcohol) or silicon, or may contain a surface treatment containing PVOH or silicon.

The aerosol-generating article comprises an aerosol-generating substrate that may comprise a load of tobacco surrounded by a wrapper as described herein. The aerosol-generating substrate may comprise any suitable type(s) of tobacco material or substitute in any suitable form. The aerosol-generating substrate may comprise full-cure tobacco, burley tobacco, Maryland tobacco, oriental tobacco, specialty tobacco, homogenized or reconstituted tobacco, or any combination thereof. Aerosol-generating substrates include tobacco cut fillers, tobacco blades, processed tobacco materials such as volume expanded or puffed tobacco, processed tobacco stems such as cut rolled or cut puffed stems, homogenized tobacco, reconstituted tobacco, cast leaves. It may also be provided in the form of tobacco, or blends thereof, and the like. The term "tobacco cut filler" is used herein to denote tobacco material that is primarily formed from the lamina portion of tobacco leaves. The term "tobacco cut filler" is used herein to indicate both a single species of Nicotiana and two or more species of Nicotiana that form a tobacco cut filler blend.

As used herein, the term "homogenized tobacco" means material formed by agglomerating particulate tobacco. Homogenized tobacco may comprise reconstituted tobacco or 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 fines, tobacco dust, tobacco stems, or mixtures of the foregoing. Reconstituted tobacco is made by extracting soluble chemicals in tobacco by-products, processing the remaining tobacco fibers into a sheet, and then reapplying the extracted material in a concentrated form onto the sheet. be able to. The term "cast leaf tobacco" is used herein to refer to the product resulting from processes well known in the art, which is a slurry comprising 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 making these types of aerosol-generating substrates are described in U.S. Pat. Nos. 5,724,998; 5,584,306; 584,306 and 6,216,706. The homogenized tobacco may be crimped, rolled, folded, or otherwise compressed to form a sheet before rolling to form a rod. For example, homogenized sheets of tobacco material for use in the present invention may be crimped using a crimping unit of the type described in Swiss Patent No. 691,156 comprising a pair of rotatable crimping rollers. good too. However, it will be appreciated that the homogenized sheets of tobacco material for use in the present invention may be textured using other suitable machinery and processes to deform or perforate the homogenized sheets of tobacco material. good too.

Aerosol-generating substrates used in aerosol-generating articles generally contain higher levels of aerosol former(s) than combustible smoking articles such as cigarettes. Wetting agents can also be referred to as "aerosol formers." Aerosol former to describe any suitable known compound or mixture of compounds that, when in use, facilitates the formation of an aerosol and is substantially resistant to thermal decomposition at the temperature of use of the aerosol-generating substrate. used for Suitable aerosol formers are known in the art and include polyhydric alcohols (propylene glycol, triethylene glycol, 1,3-butanediol, glycerin, etc.), esters of polyhydric alcohols (glycerin monoacetate, diacetate, triacetate). etc.), and aliphatic esters of mono-, di- or polycarboxylic acids (such as dimethyl dodecanedioate, dimethyl tetradecanedioate, etc.). Preferred aerosol formers are polyhydric alcohols or mixtures thereof such as propylene glycol, triethylene glycol, 1,3-butanediol, and most preferably glycerin or glycerin. The aerosol-generating substrate may comprise a single aerosol former. Alternatively, the aerosol-generating substrate may comprise a combination of two or more aerosol formers.

Aerosol-generating substrates may have high levels of aerosol formers. As used herein, a high level of aerosol former means an aerosol former content greater than about 10%, or preferably greater than about 15%, or more preferably greater than about 20% by weight. means The aerosol-generating substrate can also have an aerosol former content of about 10% to about 30%, about 15% to about 30%, or about 20% to about 30% by weight. The aerosol-generating substrate can also have a glycerin content of about 10% to about 30%, about 15% to about 30%, or from about 20% and about 30% by weight.

The aerosol-generating substrate is 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 former. The aerosol-generating substrate may comprise an aerosol former within the range of about 1 to about 20 weight percent, or about 5 to about 20 weight percent, or about 10 to about 20 weight percent.

The aerosol-generating substrate is 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 comprise glycerin within the range of about 1 to about 20 weight percent, or about 5 to about 20 weight percent, or about 10 to about 20 weight percent.

Aerosol-generating substrates in gel form may have a large amount of aerosol former, preferably glycerine. The gel composition may comprise a gelling agent forming a solid medium, an aerosol former such as glycerine dispersed in the solid medium, and nicotine dispersed in the glycerine. The composition forms a stable gel phase. The gel composition may comprise at least two gelling agents forming a solid medium, glycerine dispersed in the solid medium, and nicotine dispersed in the glycerine. The composition forms a stable gel phase. The gel composition may include a thickening agent and a gelling agent forming a solid medium, glycerin dispersed in the solid medium, and nicotine dispersed within the glycerin. The composition forms a stable gel phase. The gel composition may include nicotine, an aerosol former, a thickening agent, a hydrogen bonding cross-linked gelling agent, and an ionically cross-linked gelling agent. The gel composition may further contain divalent cations.

The gel composition may contain large amounts of aerosol formers such as glycerin. The gel composition may comprise 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%, or about 65%, or about 70% by weight of the gel composition. Glycerin may form in the gel composition from about 70% to about 80% by weight. Glycerin may form in the gel composition from about 70% to about 75% by weight.

The wrappers described herein are placed around the aerosol-generating substrate. The wrapper can reduce absorption of the aerosol former compound and water into the wrapper when air is drawn through the heated aerosol-generating article.

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

The withdrawal resistance (RTD) of an aerosol-generating article varies depending on, among other things, the length and dimensions of the passageway, the size of the opening, the dimension of the most contracted cross-sectional area of the internal passageway, and the materials used. The RTD of the aerosol-generating article is from 50 millimeters of water (mm H2O) to 140 millimeters of water (mm H2O), from 60 millimeters of water (mm H2O) to 120 millimeters of water (mm H2O), or from 80 millimeters of water (mm H2O) to 100 water. It may be in millimeters (mm H2O). The RTD of the article is measured between one or more openings and the mouth end of the article as it traverses the inner longitudinal passage under steady state conditions with a volumetric flow rate of 17.5 milliliters per second at the mouth end. refers to the difference in static pressure between The RTD of a specimen can be measured using the method described in ISO Standard 6565:2002.

All scientific and technical terms used herein have meanings commonly used in the art unless otherwise specified. The definitions provided herein are intended to facilitate understanding of certain terms frequently used herein.

As used in this specification and the appended claims, the singular forms "a," "an," and "the" refer to plural implementations. form, unless the content clearly dictates otherwise.

As used in this specification and the appended claims, the term "or" is generally used in its sense including "and/or," unless the context clearly dictates otherwise. Not as long.

As used herein, "have", "having", "include", "including", "comprise", "comprising" , or the like are used in an open-ended sense and generally mean "including, but not limited to." It should be understood that "consisting essentially of," "consisting of," and the like are subsumed by "comprising" and the like.

The terms "preferred" and "preferably" refer to embodiments of the invention that may provide certain advantages, under certain circumstances. However, other embodiments may also be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments is not intended to imply that other embodiments are not useful, nor are they intended to be excluded from the scope of the present disclosure, including the claims. Not intended.

FIG. 1 is a schematic cross-sectional view of an aerosol-generating article. Figure 2 is a schematic cross-sectional view of another aerosol-generating article. FIG. 3 is a schematic cross-sectional view of another aerosol-generating article. FIG. 4 is a schematic cross-sectional view of another aerosol-generating article. FIG. 5 is a schematic cross-sectional view of an aerosol generation system. FIG. 6 is a schematic cross-sectional view of an aerosol generation system.

The aerosol-generating articles illustrated in FIGS. 1-4 illustrate embodiments of one or more of the aerosol-generating articles or components of the aerosol-generating articles described above. Schematic drawings are not necessarily to scale and are presented for purposes of illustration and not limitation. The drawings illustrate one or more aspects described in this disclosure. However, it should be appreciated that other aspects not shown in the drawings are within the scope and spirit of the disclosure.

The aerosol-generating article 10 of FIG. 1 illustrates an aerosol-generating substrate 12 containing a tobacco 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 individually wrapped with paper layers. Specifically, the aerosol-generating substrate 12 is wrapped with a first paper layer 50 as described herein. These four elements are arranged in an end-to-end longitudinal alignment.

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

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

The aerosol-generating article 100 of FIG. 2 comprises four elements arranged in coaxial alignment: a high withdrawal resistance (RTD) end plug 600 at the distal end 103, a first paper layer 500 surrounding the aerosol-generating substrate 124; A fluid guide 400 and a mouthpiece 170 at the proximal end 101 are provided. These four elements are arranged sequentially and surrounded by a second paper layer 110 to form the aerosol-generating article 100 . Aerosol-generating article 100 has a proximal or mouth end 101 and a distal end 103 located at the opposite end of aerosol-generating article 100 from proximal end 101 . First paper layer 500 and second paper layer 110 cooperate to form a wrapper as described herein.

Aerosol-generating article 100 in FIG. 3 illustrates a cut-away view of an example aerosol-generating article 100 suitable not only for induction heating, but also for heating with a blade-like heating element.

The aerosol-generating article 100 includes a mouthpiece 170 at the proximal end 101, a fluid guide 400, an indentation 700, a first paper layer 500 surrounding the aerosol-generating substrate 124, and an end plug 600 from proximal to distal. Prepare in order to. In this example, aerosol-generating substrate 124 comprises a gel and a susceptor (not shown). The susceptor in this embodiment is a single aluminum strip centrally located along the longitudinal axis of the aerosol-generating substrate 124 . Inserting the distal end 103 of the aerosol-generating article 100 into the aerosol-generating device 200 (see FIG. 6) causes the portion of the aerosol-generating article 100 to extend into the aerosol-generating device 200 (see FIG. 6). ) in close proximity to the induction heating element 230 (see FIG. 5). The electromagnetic radiation produced 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 shadows the proximal end 101 of the aerosol-generating article 100 . When pressure is applied, it assists in the release of material from the aerosol-generating substrate 124, for example nicotine entrained in the passing aerosol. A fluid, such as air, enters the outer longitudinal passageway 831 through an opening (not shown) and travels to the cavity 700 and then to the aerosol-generating substrate 124 where the fluid mixes with the aerosol-generating substrate 124 . and entrained nicotine, it returns to the cavity and then exits at the proximal end 101 after exiting through the inner longitudinal passageway (not shown) of the fluid guide 400 .

In this embodiment, first paper layer 500 surrounds aerosol-generating substrate 124 and first paper layer 500 is surrounded by second paper layer 110 . First paper layer 500 and second paper layer 110 form a wrapper as described herein. Aerosol-generating substrate 124 may comprise a gel composition.

This aerosol-generating article 100, illustrated in FIGS. 2 and 3, may be used with an aerosol-generating device 200, as illustrated in FIGS.

Aerosol-generating article 10 in FIG. 4 illustrates aerosol-generating substrate 12 , hollow cellulose acetate tube 14 , hollow tubular segment 16 , and mouthpiece segment 18 . The aerosol-generating substrate 12 is wrapped with a first paper layer 50 as described herein. These four elements are arranged end-to-end in longitudinal alignment and surrounded by a second paper layer 20 to form the aerosol-generating article 10 . First paper layer 50 and second paper layer 20 may cooperate to form a wrapper as described herein.

The aerosol-generating article 10 has a mouth end 22 and an upstream distal end 24 located at the opposite end of the article to the mouth end 22 . The aerosol-generating article 10 shown in FIG. 4 is particularly suitable for use with electrically-operated aerosol-generating devices that include heaters for heating the aerosol-generating substrate 12 .

Aerosol-generating substrate 12 has a length of about 12 millimeters and a diameter of about 7 millimeters. Aerosol-generating substrate 12 is cylindrical in shape and has a substantially circular cross-section. The aerosol-generating substrate 12 comprises a collection of sheets of homogenized tobacco material. The sheet of homogenized tobacco material contains 10 weight percent glycerin on a dry basis. Hollow cellulose acetate tube 14 has a length of about 8 millimeters and a thickness of 1 millimeter. Mouthpiece segment 18 comprises a plug of 8 denier cellulose acetate tow per filament and has a length of about 7 millimeters.

Hollow tubular segment 14 is provided as a cylindrical tube having a length of approximately 18 millimeters and a tube wall thickness of approximately 100 micrometers. Aerosol-generating article 10 includes a ventilation zone 26 provided approximately 5 millimeters from the upstream end of mouthpiece segment 18 . Vent zone 26 is therefore 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. Vent zone 26 is therefore approximately 21 millimeters from the downstream end of aerosol-generating substrate 12 .

5-6 illustrate examples of an aerosol-generating article 100 and an aerosol-generating device 200. FIG. Aerosol-generating article 100 has a proximal or mouth end 101 and a distal end 103 . In FIG. 5, distal end 103 of aerosol-generating article 100 is received within container 220 of aerosol-generating device 200 . Aerosol-generating device 200 includes housing 210 defining container 220 configured to receive aerosol-generating article 100 . The aerosol-generating device 200 also includes a heating element 230 forming a recess 235 configured to receive the aerosol-generating article 100, preferably with an interference fit. Heating element 230 may comprise an electrical resistance heating component. Additionally, device 200 includes a power supply 240 and control electronics 250 that cooperate to control the heating of heating element 230 .

Heating element 230 may heat distal end 103 of aerosol-generating article 100 . In this embodiment, aerosol-generating substrate 124 comprises a gel containing nicotine. Heating aerosol-generating article 100 causes aerosol-generating substrate 124 to produce an aerosol containing nicotine, which can migrate out of aerosol-generating article 100 at proximal end 101 . Aerosol generator 200 comprises housing 210 . 5-6 do not show the exact heating mechanism.

In some examples, the heating mechanism can be by conductive heating, in which heat is transferred from the heating element 230 of the aerosol-generating device 200 to the aerosol-generating article 100 . This is because the aerosol-generating article 100 is positioned within the container 220 of the aerosol-generating device 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 exposed to the aerosol. When contacting the heating element 230 of the generator 200, it can be done simply. In certain embodiments, the heating element protrudes from the aerosol-generating device 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 .

In this embodiment, the heating mechanism is by induction, where the heating element emits radiomagnetic radiation that is absorbed by the tubular element when the aerosol-generating article 100 is positioned within the container 220 of the aerosol-generating device 200 .

When the aerosol-generating article 100 is releasably received within the aerosol-generating device 200 and on the heating element 230, the aerosol-generating device 200 operates to heat the aerosol-generating substrate 124 to a temperature of approximately 375 degrees Celsius. . When a user sucks on mouth end 101 of aerosol-generating article 100 , volatile compounds released from aerosol-generating substrate 124 are drawn downstream through aerosol-generating article 100 and condense into the mouthpiece of aerosol-generating article 100 . It forms an aerosol that is drawn through 101 into the user's mouth. The wrapper 500,110 repels aerosol formers and moisture from the aerosol to reduce fouling and weakening of the wrapper 500,110.

The first paper ply 50, 500 comprises a paper ply having a thickness/basis weight of about 1.2 micrometers/gsm or less. The first paper layer 50, 500 preferably has a thickness/basis weight within the range of about 1.0 micrometers/gsm to about 1.2 micrometers/gsm. The first paper layer 50, 500 may have a thickness of less than about 50 microns, or less than about 40 microns. The first paper layer 50, 500 may have a basis weight within the range of about 25 gsm to about 45 gsm, or about 35 gsm to about 40 gsm.

The first paper layer 50, 500 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 first paper layer 50, 500 layer may have a water contact angle of at least about 40 degrees, or at least about 45 degrees.

The first paper layer 50, 500 preferably has a thickness/basis weight of about 1.2 micrometers/gsm or less and an elongation to break ratio of CD/MD of about 2.5 or less. The first paper layer 50, 500 may have an elongation to break ratio of CD/MD of about 2.2 or less, or about 2 or less.

Preferably, the first paper ply 50, 500 has a thickness/basis weight of about 1.2 micrometers/gsm or less and is compliant with at least one kit oil sample of Method Tappi 559cm-02 Classical Method 2002. It is preferable to have a negative result for The first paper layer 50, 500 may have a negative result for at least 5 kit oil samples of Method Tappi 559cm-02 Classical Method 2002, or for all 10 kit oil samples.

The wrapper includes a first paper layer 50,500 and a second paper layer 20,110, the first paper layer 50,500 having a first thickness/basis weight value and a second paper layer Preferably, 20, 110 has a second thickness/basis weight value, and the first thickness/basis weight value is less than the second thickness/basis weight value. The first thickness/basis weight value may be less than 1.2 micrometers/gsm, and the wrapper may have a total thickness of less than about 80 micrometers.

The first paper layer 50, 500 preferably comprises PVOH (polyvinyl alcohol) or silicone. The first paper layer 50, 500 may include surface treatments including PVOH or silicon. Addition of PVOH (polyvinyl alcohol) or silicone may improve the grease barrier properties of the wrapper.

The second paper layer 20, 110 preferably comprises PVOH (polyvinyl alcohol) or silicone. The second paper layer 20, 110 may include surface treatments including PVOH or silicone. Addition of PVOH (polyvinyl alcohol) or silicone may improve the grease barrier properties of the wrapper.

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 (15)

An aerosol-generating article,
an aerosol-generating substrate comprising nicotine and at least about 10% aerosol former comprising glycerin;
a wrapper positioned 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; An aerosol-generating article comprising: The aerosol-generating article of claim 1, wherein the paper layer has a thickness/basis weight within the range of about 1.0 micrometers/gsm to about 1.2 micrometers/gsm. The aerosol-generating article of any of claims 1-2, wherein the paper layer has a thickness of less than about 50 micrometers, or less than about 40 micrometers. The aerosol-generating article of any of claims 1-3, wherein the paper layer has a basis weight within the range of about 25 gsm to about 45 gsm, or about 35 gsm to about 40 gsm. The aerosol-generating article of any of claims 1-4, wherein the paper layer comprises PVOH or silicone. The aerosol-generating article of any of claims 1-5, wherein the paper layer comprises a surface treatment comprising PVOH or silicone. The aerosol-generating article of any of claims 1-6, wherein the paper layer comprises PVOH. The aerosol-generating article of any of claims 1-7, wherein the paper layer comprises silicone. The aerosol-generating article of any of claims 1-8, wherein the aerosol-generating substrate comprises a gel composition. 10. The aerosol-generating article of Claim 9, wherein said gel composition comprises a high amount of glycerin. 11. The aerosol-generating article of claim 10, wherein said gel composition comprises xanthan gum. The aerosol-generating article of any of claims 1-11, wherein the aerosol-generating substrate comprises homogenized tobacco material. 13. The homogenized tobacco material of claim 12, wherein the homogenized tobacco material comprises, on a dry weight basis, tobacco material, about 1 percent to about 5 percent binder, and about 5 percent to about 30 percent aerosol former. Aerosol-generating articles. The aerosol-generating article of any of claims 1-13, wherein the aerosol-generating substrate comprises a metal induction heating element. The aerosol-generating article of any of claims 1-14, wherein the aerosol-generating substrate comprises a plurality of metal induction heating elements.

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