Aerosol-generating article having a heat-shrinkable wrapper

Abstract

The present invention relates to an aerosol-generating article comprising an aerosol-forming substrate portion and a heat-shrinkable wrapper at least partially surrounding the aerosol-forming substrate portion.The present invention further relates to an aerosol-generating system comprising the aerosol-generating article and an aerosol-generating device.

Description

[Technical field]

[0001] The present disclosure relates to an aerosol generating article.The present disclosure further relates to an aerosol generating system. [Background technology]

[0002] It is known to provide an aerosol-generating device for producing an inhalable vapour. Such a device may heat an aerosol-forming substrate contained in an aerosol-generating article without combusting the aerosol-forming substrate. The aerosol-generating article may have a rod shape for inserting the aerosol-generating article into a heating chamber of the aerosol-generating device.

[0003] The aerosol-generating device may comprise a heating arrangement, which may be an inductive heating arrangement and may comprise an induction coil configured to inductively heat the susceptor, which may be part of the device or part of the aerosol-generating article.

[0004] As the aerosol-generating article heats up, some structural reorganization of the aerosol-forming substrate within the article may occur. This may be due to thermal processes, such as a reduction in volume due to the continuous volatilization of volatile components of the aerosol-forming substrate. This may reduce the thermal contact between the aerosol-forming substrate and the heating element during use. This may result in a change in the drawing resistance during use.

[0005] It would be desirable to provide an aerosol-generating article with improved heating performance.It would be desirable to provide an aerosol-generating article with improved thermal contact with a heating element during use.It would be desirable to provide an aerosol-generating article with improved control of withdrawal resistance.It would be desirable to provide an aerosol-generating article with a more consistent withdrawal resistance during use.

[0006] It would be desirable to provide an aerosol-generating article that allows for improved removal of a used aerosol-generating article from the heated chamber of an aerosol-generating device.

[0007] It is desirable to provide an aerosol-generating article that allows a user to visually detect whether the article is a new article or a used article.

[0008] It is desirable to provide an aerosol-generating article that exhibits reduced fouling. Summary of the Invention

[0009] According to an embodiment of the present invention there is provided an aerosol-generating article comprising a heat-shrinkable wrapper. The aerosol-generating article may comprise an aerosol-forming substrate portion, the heat-shrinkable wrapper may at least partially surround the aerosol-forming substrate portion.

[0010] According to an embodiment of the present invention, there is provided an aerosol-generating article comprising an aerosol-forming substrate portion and a heat-shrinkable wrapper at least partially surrounding the aerosol-forming substrate portion.

[0011] During use of the aerosol-generating article, the aerosol-forming substrate is heated to vaporize the compound of the aerosol-forming substrate. Thereby, the heat-shrinkable wrapper surrounding the aerosol-forming substrate portion may also be heated, for example, by heat transfer from the aerosol-forming substrate. When heated, the heat-shrinkable wrapper may shrink or contract in the area where it surrounds the aerosol-forming substrate. The shrinkage of the heat-shrinkable wrapper may reduce the outer diameter of the aerosol-generating article during use in that area.

[0012] A user may visually verify whether the aerosol-generating article includes at least a component having a reduced diameter. An aerosol-generating article may be provided that allows a user to visually detect whether the article is new or used.

[0013] For example, at least a portion of the aerosol-generating article comprising the aerosol-forming substrate portion may be inserted into a heating chamber of an aerosol-generating device to heat the aerosol-forming substrate portion. Shrinkage of the heat-shrinkable wrapper during heating may reduce the circumference of the aerosol-generating article. In other words, the diameter of the aerosol-generating article may decrease. This may improve the extractability of the aerosol-generating article from the heating chamber after use.

[0014] During heating, volatile compounds of the aerosol-forming substrate may be vaporized. The mass and density of the aerosol-forming substrate may thereby be reduced during heating. The reduced density may result in a reduced pull-out retention force. Contraction of the heat-shrinkable wrapper may compress the heated aerosol-forming substrate. The reduced density may thereby be reduced. The reduced pull-out retention force may be reduced. An aerosol-generating article may be provided with improved control of pull-out resistance. An aerosol-generating article may be provided with a more consistent pull-out resistance during use.

[0015] Contraction of the heat-shrinkable wrapper during heating may result in compression or compaction of the aerosol-forming substrate portion. Improved nicotine delivery may be provided. Improved structural stability of the compressed aerosol-forming substrate portion may be provided. Improved thermal conductivity of the compressed aerosol-forming substrate portion may be improved. This may improve the efficiency of heating.

[0016] The aerosol-generating article may be configured as a heat-non-combustion article. The heat-non-combustion article may be configured for use with an aerosol-generating device.

[0017] The aerosol-generating article may comprise a susceptor element, which may be arranged to be inductively heated by an inductor coil of an aerosol generating device.

[0018] The susceptor element may be surrounded by the aerosol-forming substrate portion. The susceptor element may be centrally disposed within the aerosol-forming substrate portion.

[0019] Contraction of the heat-shrinkable wrapper during heating may compress or compress the aerosol-forming substrate portion towards the susceptor element, which may provide improved thermal contact between the susceptor element and the aerosol-forming substrate portion, which may improve the efficiency of heating.

[0020] During use, the aerosol-forming substrate portion comprising the susceptor element may be heated by an inductor coil of the aerosol generating device. At least a portion of the heat-shrinkable wrapper surrounding the aerosol-forming substrate portion may also be heated and shrunk. When the heat-shrinkable wrapper shrinks, it may lead to the shrunken wrapper pushing the aerosol-forming substrate towards the centrally disposed susceptor. Thermal contact between the susceptor element and the aerosol-forming substrate may be improved. Heating efficiency may be improved.

[0021] The heat shrink wrapper may at least partially surround one or more fastening elements, which may be one or both of a filter element, a hollow tubular element, and a front plug.

[0022] The fastening element may provide additional structural stability to the aerosol-generating article comprising the heat-shrinkable wrapper. When exposed to heat, the heat-shrinkable wrapper may shrink in an area surrounding the aerosol-forming substrate portion. Another area of ​​the heat-shrinkable wrapper may surround the fastening element. This other area of ​​the heat-shrinkable wrapper may not shrink or shrink very little during use. For example, the material of the fastening element may have sufficient rigidity to prevent the heat-shrinkable wrapper from substantially shrinking in that area. For example, the fastening element may not heat much during use, so that the heat-shrinkable wrapper may not heat much or may heat very little in the area of ​​the fastening element. Thereby, in the area where the heat-shrinkable wrapper is fastened to the fastening element, there may be little structural change during use. Durable fastening of the heat-shrinkable wrapper may be provided. Improved structural stability of the aerosol-generating article may be provided.

[0023] The aerosol-generating article may be at least partially inserted into the cavity of the aerosol-generating device during use. The outer diameter of the aerosol-generating article and the inner diameter of the cavity may be approximately the same or similar. The aerosol-generating article may be held by a friction fit within the cavity. At the location of the fixing element, the diameter of the aerosol-generating article may not shrink or may shrink very little during use. Thus, the fixing element may help maintain the friction fit of the aerosol-generating article within the cavity during use. At least a portion of the cavity may be configured as a heating chamber of the aerosol-generating device.

[0024] The aerosol-generating article may comprise a front plug disposed at a distal end of the aerosol-generating article. The front plug may comprise a filter material. A heat shrink wrapper may at least partially surround the front plug. The front plug may be disposed as a fastening element.

[0025] The length of the front plug may be at least 4 millimetres, preferably at least 5 millimetres, more preferably at least 6 millimetres. The length of the front plug may be measured along the longitudinal axis of the aerosol-generating article.

[0026] For example, having an anterior plug with a length of 4 millimeters or more may improve the fixation effectiveness of the anterior plug as compared to shorter anterior plugs. The increased length may allow a larger portion of the heat shrink wrapper to surround and thus be structurally supported by the fixation element.

[0027] The ratio between the length of the front plug and the length of the aerosol-forming substrate portion may be at least 0.3, preferably at least 0.4, more preferably at least 0.5. The length of the front plug and the length of the aerosol-forming substrate portion may be measured along the longitudinal axis of the aerosol-generating article.

[0028] The length of the aerosol-forming substrate portion may be from 7 mm to 17 mm, preferably from 9 mm to 15 mm, more preferably from 11 mm to 13 mm, more preferably about 12 mm.

[0029] The total length of the aerosol-generating article may be 40 mm to 50 mm, preferably about 45 mm. The length of the aerosol-forming substrate portion along the longitudinal direction of the aerosol-generating article may be 20% to 35% of the total length of the aerosol-generating article, 24% to 30% of the total length of the aerosol-generating article, more preferably about 27% of the total length of the aerosol-generating article.

[0030] The density of the aerosol-forming substrate portion may be 0.3 grams / cubic centimeter to 1 gram / cubic centimeter, preferably 0.4 grams / cubic centimeter to 0.9 grams / cubic centimeter. If the density of the aerosol-forming substrate portion is low, for example, less than 0.3 grams / cubic centimeter, the aerosol-forming substrate portion is easily compressed, and the aerosol-generating article may shrink more than intended. If the density of the aerosol-forming substrate portion is high, for example, more than 1 gram / cubic centimeter, the aerosol-forming substrate portion becomes almost incompressible, and the aerosol-generating article may be prevented from substantially shrinking during use.

[0031] The aerosol-forming substrate portion may have a density of 0.5 grams per cubic centimeter or less. The aerosol-forming substrate portion may have a density of 0.24 grams per cubic centimeter to 0.45 grams per cubic centimeter. The aerosol-forming substrate portion may have a density of 0.24 grams per cubic centimeter to 0.4 grams per cubic centimeter, 0.24 grams per cubic centimeter to 0.34 grams per cubic centimeter, 0.24 grams per cubic centimeter to 0.3 grams per cubic centimeter, or 0.24 grams per cubic centimeter to 0.34 grams per cubic centimeter. The aerosol-forming substrate may have a density of about 0.28 grams per cubic centimeter.

[0032] As used herein, the "density" of an aerosol-forming substrate portion refers to the mass of the aerosol-forming substrate in the aerosol-forming substrate portion divided by the volume taken up by the aerosol-forming substrate when in the aerosol-generating article. The "mass" of the aerosol-forming substrate does not include the mass of any packaging material surrounding the aerosol-forming substrate portion. The "volume" taken up by the aerosol-forming substrate does not include the volume of any packaging material surrounding the aerosol-forming substrate portion.

[0033] The aerosol-forming substrate of the aerosol-forming substrate portion may comprise an aerosol former. The aerosol former may be selected from one or more of polyhydric alcohols, esters of polyhydric alcohols, and aliphatic esters of mono-, di-, or polycarboxylic acids. The aerosol former may comprise a polyhydric alcohol or a mixture thereof. The aerosol former may comprise or consist of glycerin.

[0034] The aerosol-forming substrate may have an aerosol former content of 5 percent or more by weight on a dry weight basis, preferably 5 to 30 percent by weight on a dry weight basis. The aerosol-forming substrate may have an aerosol former content of 10 percent or more by weight on a dry weight basis, preferably 10 to 30 percent by weight on a dry weight basis. The aerosol-forming substrate may have an aerosol former content of 15 percent or more by weight on a dry weight basis, preferably 15 to 30 percent by weight on a dry weight basis.

[0035] The aerosol-generating article may comprise one or more hollow tubular elements. The one or more hollow tubular elements may comprise one or both of hollow acetate tubes (HAT) or fine hollow acetate tubes (FHAT). Such hollow tubes are cylindrical components made of cellulose acetate and provided with a centrally disposed axial hole. The dimensions of the hollow tube, such as the outer diameter of the hollow tube and the outer diameter or diameter of the hole, may vary and can be designed according to the requirements of each product.

[0036] As used herein, the term "heat shrinkable wrapper" refers to a wrapper made from a material that shrinks under exposure to heat.

[0037] The heat shrinkable wrapper may be a uniaxially oriented heat shrinkable wrapper. As used herein, the term "uniaxially oriented heat shrinkable wrapper" refers to a wrapper that is heat shrinkable only in one heat shrinkable direction and is not substantially heat shrinkable in the orthogonal direction. The heat shrinkable direction may be the machine direction. The heat shrinkable direction may be the cross direction.

[0038] As used herein, the "machine direction" is the direction of forward movement of the forming wrapper on a wrapper-making or papermaking machine. The direction perpendicular to this direction is called the "cross direction."

[0039] A uniaxially oriented heat-shrinkable wrapper may be disposed within the aerosol-generating article such that the heat-shrink direction is oriented perpendicular to the longitudinal axis of the aerosol-generating article.

[0040] Generally, the length of the aerosol-generating article may not be intended to shrink significantly during use. Generally, it may be intended that the periphery of the aerosol-generating article primarily shrinks during use. This may be achieved by an arrangement in which the primary heat-shrinkable direction of the heat-shrinkable wrapper is oriented perpendicular to the longitudinal axis of the aerosol-generating article.

[0041] The heat shrinkable wrapper may be a biaxially oriented heat shrinkable wrapper. As used herein, the term "biaxially oriented heat shrinkable wrapper" refers to a wrapper that is heat shrinkable in both a heat shrinkable first direction and an orthogonal heat shrinkable second direction. The first direction may be the machine direction and the second direction may be the cross direction. The first direction may be the cross direction and the second direction may be the machine direction.

[0042] A biaxially oriented heat shrinkable wrapper may have the same shrink rate in both a first direction and a second direction.

[0043] A biaxially oriented heat-shrinkable wrapper may have a higher shrinkage rate in a first direction than in a second direction, in which case the heat-shrinkable wrapper may be disposed within the aerosol-generating article such that the second direction, having the lower shrinkage rate, is oriented parallel to the longitudinal axis of the aerosol-generating article.

[0044] The heat shrinkable wrapper may have a length shrinkage of 1% to 25%, preferably 2% to 20%, more preferably 3% to 15%, more preferably 4% to 15%, more preferably 5% to 15%, more preferably 6% to 15%, more preferably 7% to 15%, more preferably 8% to 15%, more preferably 9% to 15%, more preferably 10% to 17%, more preferably 10% to 16%, more preferably 10% to 15%. Shrinkage may be measured in length shrinkage according to Test Method A defined herein.

[0045] The heat shrinkable wrapper may have a length shrink percentage at a temperature of 120 degrees Celsius or less of 1% to 25%, preferably 2% to 20%, more preferably 3% to 15%, more preferably 4% to 15%, more preferably 5% to 15%, more preferably 6% to 15%, more preferably 7% to 15%, more preferably 8% to 15%, more preferably 9% to 15%, more preferably 10% to 17%, more preferably 10% to 16%, more preferably 10% to 15%. The heat shrinkable wrapper may have a length shrinkage in one or both of the machine and cross directions of 1% to 25%, preferably 2% to 20%, more preferably 3% to 15%, more preferably 4% to 15%, more preferably 5% to 15%, more preferably 6% to 15%, more preferably 7% to 15%, more preferably 8% to 15%, more preferably 9% to 15%, more preferably 10% to 17%, more preferably 10% to 16%, more preferably 10% to 15%, at a temperature of 120 degrees Celsius or less. The shrinkage may be measured in length shrinkage according to Test Method A defined herein.

[0046] The heat shrinkable wrapper may have a length shrinkage in one or both of the machine and cross directions of from 1% to 25%, preferably from 2% to 20%, more preferably from 3% to 15%, more preferably from 4% to 15%, more preferably from 5% to 15%, more preferably from 6% to 15%, more preferably from 7% to 15%, more preferably from 8% to 15%, more preferably from 9% to 15%, more preferably from 10% to 17%, more preferably from 10% to 16%, more preferably from 10% to 15%, where the shrinkage is measured in length shrinkage according to Test Method A defined herein.

[0047] The heat shrinkable wrapper may have a shrinkage percentage of 2% to 50%, preferably 4% to 40%, more preferably 6% to 30%, more preferably 8% to 30%, more preferably 10% to 30%, more preferably 15% to 30%, more preferably 18% to 35%, more preferably 18% to 30%. Shrinkage percentage may be measured in areal shrinkage according to Test Method A defined herein.

[0048] The heat shrinkable wrapper may have a shrinkage percentage of 2% to 50%, preferably 4% to 40%, more preferably 6% to 30%, more preferably 8% to 30%, more preferably 10% to 30%, more preferably 15% to 30%, more preferably 18% to 35%, more preferably 18% to 30% at a temperature of 120 degrees Celsius or less. The shrinkage percentage may be measured in percent areal shrinkage according to Test Method A defined herein.

[0049] The heat shrinkable wrapper may have a shrinkage percentage of 2% to 50%, preferably 4% to 40%, more preferably 6% to 30%, more preferably 8% to 30%, more preferably 10% to 30%, more preferably 15% to 30%, more preferably 18% to 35%, more preferably 18% to 30%, where shrinkage percentage is measured in areal shrinkage according to Test Method A defined herein.

[0050] The heat shrinkable wrapper may have a shrinkage percentage in one or both of the machine and cross directions of from 1% to 25%, preferably from 2% to 20%, more preferably from 3% to 15%, more preferably from 10% to 15%, with shrinkage percentage measured according to ASTM D 2732-03.

[0051] The heat shrinkable wrapper may have a shrinkage percentage in one or both of the machine and cross directions of from 1% to 25%, preferably from 2% to 20%, more preferably from 3% to 15%, more preferably from 10% to 15%, where shrinkage percentage is measured in accordance with ISO 11501:1995.

[0052] The aerosol-generating article may have a shrinkage percentage of 1% to 25%, preferably 2% to 20%, more preferably 3% to 15%, more preferably 10% to 15%, the shrinkage percentage being measured according to ISO 11501 "Measurement of dimensional change on heating" using film specimens cut to 5 x 10 cm from a heat-shrinkable wrapper and placed in an oven in air at 120°C for 5 minutes, the relative decrease in length of the film so treated compared to the original film being reported as the shrinkage percentage.

[0053] For a given heat shrink wrapper, the shrink percentages in the machine direction and transverse length may be the same. For a given heat shrink wrapper, the shrink percentages in the machine direction and transverse length may be different.

[0054] The heat-shrinkable wrapper may have a shrinkage percentage in the machine direction length that exceeds the shrinkage percentage in the transverse direction length, and the heat-shrinkable wrapper may be disposed within the aerosol-generating article such that the machine direction of the heat-shrinkable wrapper is oriented perpendicular to the longitudinal axis of the aerosol-generating article.

[0055] The heat-shrinkable wrapper may have a transverse length shrinkage that exceeds its machine direction length shrinkage, and the heat-shrinkable wrapper may be disposed within the aerosol-generating article such that the machine direction of the heat-shrinkable wrapper is oriented parallel to the longitudinal axis of the aerosol-generating article.

[0056] The heat shrinkable wrapper may comprise or consist essentially of one or more of cellophane, cellulose hydrate, methylcellulose, carboxymethylcellulose, biaxially oriented polypropylene (BOPP), low density polyethylene (LDPE), and high density polyethylene (HDPE).

[0057] The heat shrinkable wrapper may comprise a cellulose derivative, preferably one or more of cellulose hydrate, methylcellulose, and carboxymethylcellulose.

[0058] The cellulose hydrate or cellophane may be coated with polyvinylidene chloride (PVDC).The heat shrinkable wrapper may include cellulose hydrate or cellophane, or may be free of polyvinylidene chloride (PVDC).

[0059] The heat shrinkable wrapper may comprise or consist of an aerosol-forming substrate.The heat shrinkable wrapper may comprise or consist of a solid aerosol-forming substrate.The heat shrinkable wrapper may comprise or consist of a solid aerosol-forming substrate film.

[0060] The aerosol-forming substrate of the heat-shrinkable wrapper may include nicotine, one or more cellulosic agents, one or more aerosol formers, and one or more carboxylic acids.

[0061] The aerosol-forming substrate of the heat-shrinkable wrapper may comprise a total aerosol former content of at least 30 weight percent, more preferably at least 35 weight percent, more preferably at least 40 weight percent, more preferably at least 45 weight percent, more preferably at least 50 weight percent, on a dry weight basis.

[0062] The aerosol-forming substrate of the heat shrinkable wrapper may comprise a total carboxylic acid content on a dry weight basis of from 0.1 weight percent to 6 weight percent, preferably from 0.5 weight percent to 4 weight percent, more preferably from 1.0 weight percent to 2.5 weight percent, and more preferably from 1.4 weight percent to 2.0 weight percent.

[0063] The one or more carboxylic acids of the aerosol-forming substrate of the heat shrinkable wrapper may be selected from lactic acid, levulinic acid, acetic acid, adipic acid, benzoic acid, citric acid, fumaric acid, maleic acid, malic acid, myristic acid, oxalic acid, salicylic acid, stearic acid, succinic acid, and undecanoic acid. The one or more carboxylic acids of the aerosol-forming substrate of the heat shrinkable wrapper may be selected from acetic acid, adipic acid, benzoic acid, citric acid, fumaric acid, maleic acid, malic acid, myristic acid, oxalic acid, salicylic acid, stearic acid, succinic acid, and undecanoic acid. The one or more carboxylic acids of the aerosol-forming substrate of the heat shrinkable wrapper may be selected from acetic acid, benzoic acid, citric acid, fumaric acid, maleic acid, and malic acid. The one or more carboxylic acids of the aerosol-forming substrate of the heat shrinkable wrapper may be selected from fumaric acid, maleic acid, and malic acid. The one or more carboxylic acids of the aerosol-forming substrate of the heat-shrinkable wrapper may be selected from fumaric acid and maleic acid.The one or more carboxylic acids of the aerosol-forming substrate of the heat-shrinkable wrapper may be fumaric acid.

[0064] The aerosol-forming substrate of the heat-shrinkable wrapper may comprise a total tobacco content of less than 5 weight percent on a dry weight basis, preferably less than 4 weight percent, more preferably less than 3 weight percent, more preferably less than 2 weight percent, more preferably less than 1 weight percent. The aerosol-forming substrate of the heat-shrinkable wrapper may be tobacco-free.

[0065] The aerosol-forming substrate of the heat shrinkable wrapper may have a total cellulosic film material content of from 35 weight percent to 55 weight percent, preferably from 40 weight percent to 50 weight percent, and more preferably from 43 weight percent to 47 weight percent, on a dry weight basis.

[0066] The aerosol-forming substrate of the heat-shrinkable wrapper may comprise one or more cellulosic film-forming agents selected from carboxymethylcellulose and hydroxypropylmethylcellulose.

[0067] The aerosol-forming substrate of the heat-shrinkable wrapper may comprise one or more cellulosic reinforcing agents selected from cellulose fibers, microcrystalline cellulose and cellulose powder.

[0068] The aerosol-forming substrate of the heat shrinkable wrapper may comprise nicotine and fumaric acid, preferably the molar ratio of fumaric acid to nicotine is from 1.2:1 to 1.8:1, more preferably from 1.3:1 to 1.7:1, more preferably from 1.4:1 to 1.6:1, more preferably about 1.5:1.

[0069] Heat shrinkable materials may provide a wrapper that may be less prone to staining as compared to wrappers made from non-heat shrinkable wrapping papers.

[0070] The aerosol-generating article may have a cylindrical shape.The aerosol-forming substrate portion may have a cylindrical shape.

[0071] The aerosol-generating article may comprise, from the proximal end to the distal end of the article, a mouth-end filter, one or more intermediate elements, an aerosol-forming substrate portion, and optionally a front plug. The one or more intermediate elements may include one or more of a HAT, a FHAT, and a PLA plug. The overall length of the article may be about 45 millimeters, and the length of the aerosol-forming substrate portion may be about 12 millimeters. The heat-shrinkable wrapper may surround the entire article or only a portion of it.

[0072] In addition to the heat shrink wrapper, the aerosol-generating article may comprise one or more non-heat shrink wrappers. The one or more non-heat shrink wrappers may surround the complete aerosol-generating article including the heat shrink wrapper. The one or more non-heat shrink wrappers may surround the complete aerosol-generating article or may be at least partially surrounded by the heat shrink wrapper.

[0073] The heat-shrinkable wrapper may surround only a portion of the aerosol-generating article, and one or more non-heat-shrinkable wrappers may surround at least other portions of the aerosol-generating article that are not surrounded by a heat-shrinkable wrapper.

[0074] The one or more non-heat shrinkable wrappers may be paper wrappers or non-paper wrappers. Paper wrappers may include cigarette paper and filter plug wrap. Non-paper wrappers may include a sheet of homogenized tobacco material and multiple layers of laminate material, including, for example, an aluminum co-laminate sheet.

[0075] The aerosol-generating article may comprise two or more heat-shrinkable wrappers surrounding different longitudinal portions of the aerosol-generating article.

[0076] According to an embodiment of the present invention, there is provided an aerosol generating system comprising an aerosol generating article and an aerosol generating device as described herein. The aerosol generating device may include a cavity configured for at least partial insertion of the aerosol generating article into the cavity. The aerosol generating article and the cavity may be dimensioned such that the aerosol generating article is held within the cavity by a friction fit. The aerosol generating article may include a fastening element as disclosed herein. The fastening element may ensure that the friction fit is maintained during use of the aerosol generating system when the aerosol generating device operates to heat the aerosol generating article. At least a portion of the cavity may be configured as a heating chamber.

[0077] The aerosol generating device may include an inductor coil. The inductor coil may at least partially surround the cavity or heating chamber. The inductor coil may be arranged to coaxially surround the heating chamber. The inductor coil may be arranged to inductively heat a susceptor element. The susceptor element may be part of the aerosol generating device. The susceptor element may be part of the aerosol-generating article. The inductor coil may be arranged to inductively heat a susceptor element of the aerosol-generating article when the aerosol-generating article is inserted into the heating chamber.

[0078] As used herein, the term "aerosol-forming substrate" relates to a substrate capable of releasing a volatile compound capable of forming an aerosol or vapor. Such a volatile compound may be released by heating the aerosol-forming substrate. The aerosol-forming substrate may be in solid or liquid form. The aerosol-forming substrate may be solid or liquid or may include both solid and liquid components. The aerosol-forming substrate may be part of an aerosol-generating article. The terms "aerosol" and "vapor" are used interchangeably.

[0079] The aerosol-forming substrate may comprise nicotine. The nicotine-containing aerosol-forming substrate may be a nicotine salt matrix.

[0080] The aerosol-forming substrate may comprise a plant-derived material. The aerosol-forming substrate may comprise tobacco. The aerosol-forming substrate may comprise a tobacco-containing material comprising volatile tobacco flavour compounds that are released from the aerosol-forming substrate upon heating. Alternatively, the aerosol-forming substrate may comprise a non-tobacco material. The aerosol-forming substrate may comprise a homogenized plant-derived material. The aerosol-forming substrate may comprise a homogenized tobacco material. The homogenized tobacco material may be formed by agglomerating particulate tobacco. In a particularly preferred embodiment, the aerosol-forming substrate may comprise an assembly of crimped sheets of homogenized tobacco material. As used herein, the term "crimped sheet" refers to a sheet having a plurality of substantially parallel ridges or corrugations.

[0081] The aerosol-forming substrate may include at least one aerosol former. The aerosol former is any suitable known compound or mixture of compounds that facilitates the formation of a dense, stable aerosol during use and is substantially resistant to thermal decomposition at the operating temperature of the device. Suitable aerosol formers are well known in the art and include, but are not limited to, polyhydric alcohols (such as triethylene glycol, 1,3-butanediol, and glycerin), esters of polyhydric alcohols (such as glycerol monoacetate, diacetate, or triacetate), and aliphatic esters of mono-, di-, or polycarboxylic acids (such as dimethyl dodecanedioate, dimethyl tetradecanedioate, and the like). A preferred aerosol former is a polyhydric alcohol or mixtures thereof (such as triethylene glycol, 1,3-butanediol, and the like). Preferably, the aerosol former is glycerin. When present, the homogenized tobacco material may have an aerosol former content of 5 weight percent or more on a dry weight basis, and preferably between 5 weight percent and 30 weight percent on a dry weight basis. The aerosol-forming substrate may contain other additives and ingredients, such as flavourants.

[0082] The aerosol-forming substrate preferably comprises a plant material and an aerosol former, the plant material preferably being an alkaloid-containing plant material, more preferably being a nicotine-containing plant material, and more preferably being a tobacco-containing material.

[0083] Preferably, the aerosol-forming substrate comprises at least 70 percent by weight plant material on a dry weight basis, more preferably at least 90 percent by weight plant material.Preferably, the aerosol-forming substrate comprises less than 95 percent by weight plant material on a dry weight basis, such as 90-95 percent by weight plant material on a dry weight basis.

[0084] Preferably, the aerosol-forming substrate comprises at least 5 weight percent aerosol formers on a dry weight basis, more preferably at least 10 weight percent aerosol formers.Preferably, the aerosol-forming substrate comprises less than 30 weight percent aerosol formers on a dry weight basis, such as from 5 to 30 weight percent aerosol formers on a dry weight basis.

[0085] As used herein, the term "aerosol-generating article" refers to an article that includes an aerosol-forming substrate capable of releasing a volatile compound capable of forming an aerosol. For example, the aerosol-generating article may be an article that generates an aerosol that can be directly inhaled by a user sucking or puffing on a mouthpiece at the proximal or user end of the device. The aerosol-generating article may be disposable. The aerosol-generating article may be insertable into a heating chamber of an aerosol-generating device.

[0086] As used herein, the term "aerosol-generating device" refers to a device that interacts with an aerosol-forming substrate to generate an aerosol. The aerosol-generating device may interact with an aerosol-generating article that includes the aerosol-forming substrate. In some examples, the aerosol-generating device may heat the aerosol-forming substrate to facilitate the release of volatile compounds from the substrate. An electrically operated aerosol-generating device may include an atomizer, such as an electric heater, for heating the aerosol-forming substrate to form an aerosol.

[0087] As used herein, the term "aerosol-generating system" refers to the combination of an aerosol-generating device with an aerosol-forming substrate. When the aerosol-forming substrate forms part of an aerosol-generating article, the aerosol-generating system refers to the combination of an aerosol-generating device with an aerosol-generating article. In an aerosol-generating system, the aerosol-forming substrate and the aerosol-generating device work together to generate an aerosol.

[0088] As used herein, the term "proximal" refers to the user end or mouth end of the aerosol-generating article, and the term "distal" refers to the end opposite the proximal end.

[0089] As used herein, "susceptor" or "susceptor element" means an element that heats up when subjected to an alternating magnetic field. This may be the result of eddy currents, hysteresis losses, or both eddy currents and hysteresis losses induced in the susceptor element. In use, the susceptor element is positioned in thermal contact or in thermal proximity with an aerosol-forming substrate received in an aerosol generator or cartridge. In this manner, the aerosol-forming substrate is heated by the susceptor, thereby forming an aerosol.

[0090] The susceptor material may be any material that can be inductively heated to a temperature sufficient to aerosolize the aerosol-forming substrate. The following examples and features of the susceptor may apply to one or both of the susceptor element of the cartridge, the susceptor of the aerosol-generating device, and the susceptor of the aerosol-generating article. Suitable materials for the susceptor material include graphite, molybdenum, silicon carbide, stainless steel, niobium, aluminum, nickel, nickel-containing compounds, titanium, and composites of metallic materials. Preferred susceptor materials include metals or carbon. Advantageously, the susceptor material may include or consist of ferromagnetic or ferrimagnetic materials, such as ferritic iron, ferromagnetic alloys, such as ferromagnetic steel or stainless steel, ferromagnetic particles, and ferrites. A suitable susceptor material may be or include aluminum. The susceptor material may contain more than 5 percent, preferably more than 20 percent, more preferably more than 50 percent or more than 90 percent ferromagnetic, ferrimagnetic, or paramagnetic material. Preferred susceptor materials may be heated to temperatures in excess of 250 degrees Celsius without degradation.

[0091] Test method A Five square samples, each having a side length of 10 millimeters, are cut from the heat shrink wrapper.

[0092] The samples are conditioned in air at 23° C.±2° C. and 50%±5% relative humidity for at least 40 hours.

[0093] The sample is then heated in an oven at 120°C ± 2°C for 5 minutes.

[0094] The samples are then removed from the oven and cooled to 23°C + / - 2°C. The linear dimensions of each of the five samples are then recorded in both the machine and cross directions. From the five recorded values, average values ​​in both the machine and cross directions are determined. The average value is determined by dividing the sum of the five measurements in millimeters by five.

[0095] Length shrinkage percentages are calculated for each machine and cross direction by dividing the respective average values ​​by 10 millimeters and multiplying by 100.

[0096] Shrinkage percentage areal shrink is calculated by multiplying the machine direction average by the cross direction average and dividing the product by square millimeters. EXAMPLES

[0097] The following provides a non-exhaustive list of non-limiting examples, any one or more of the features of which may be combined with any one or more features of the other examples, embodiments, or aspects described herein.

[0098] Example 1: 1. An aerosol-generating article comprising an aerosol-forming substrate portion and a heat-shrinkable wrapper at least partially surrounding the aerosol-forming substrate portion, Preferably, the heat shrink wrapper has a length shrinkage of 1% to 25%; More preferably, the aerosol-generating article has a heat-shrinkable wrapper that has a length shrinkage of 1% to 25% at a temperature of 120 degrees Celsius or less. Example 2: The aerosol-generating article of Example 1, wherein the aerosol-generating article is configured as a heated non-combustion article for use in an aerosol generating device. Example 3: The aerosol-generating article of example 1 or example 2, wherein the heat-shrinkable wrapper at least partially surrounds the fastening element, and the fastening element is one or both of a filter element, a hollow tubular element, and a front plug. Example 4: An aerosol-generating article as described in any one of Examples 1 to 3, comprising a front plug disposed at the distal end of the aerosol-generating article, preferably wherein the front plug is configured as a fixation element and wherein a heat-shrinkable wrapper at least partially surrounds the front plug. Example 5: The aerosol-generating article of example 4, wherein the front plug comprises a filter material. Example 6: An aerosol-generating article as described in Example 4 or Example 5, wherein the length of the front plug is 4 millimeters or more, preferably 5 millimeters or more, more preferably 6 millimeters or more. Example 7: 7. An aerosol-generating article according to any one of Examples 4 to 6, wherein the ratio between the length of the front plug and the length of the aerosol-forming substrate portion is 0.3 or more, preferably 0.4 or more, more preferably 0.5 or more. Example 8: 8. An aerosol-generating article as claimed in any one of Examples 1 to 7, wherein the length of the aerosol-forming substrate portion is between 9 mm and 15 mm, preferably between 11 mm and 13 mm, and more preferably about 12 mm. Example 9: 9. The aerosol-generating article according to any one of Examples 1 to 8, wherein the density of the aerosol-forming substrate portion is from 0.3 grams / cubic centimeter to 1 gram / cubic centimeter, preferably from 0.4 grams / cubic centimeter to 0.9 grams / cubic centimeter. Example 10: 10. An aerosol-generating article according to any one of Examples 1 to 9, comprising a susceptor element. Example 11: 11. The aerosol-generating article of example 10, wherein the susceptor element is surrounded by an aerosol-forming substrate portion. Example 12: 12. The aerosol-generating article of any of Examples 1-11, wherein the aerosol-forming substrate portion comprises an aerosol former, preferably the aerosol former is selected from one or more of a polyhydric alcohol, an ester of a polyhydric alcohol, and an aliphatic ester of a monocarboxylic acid, a dicarboxylic acid, or a polycarboxylic acid, more preferably the aerosol former comprises a polyhydric alcohol or a combination thereof, more preferably the aerosol former comprises glycerin. Example 13: 13. The aerosol-generating article of example 12, wherein the aerosol-forming substrate portion comprises an aerosol former content of 5 weight percent or more on a dry weight basis, preferably 5 weight percent to 30 weight percent on a dry weight basis. Example 14: the heat shrink wrapper has a shrinkage percentage of 1% to 9%, preferably 2% to 8%, more preferably 3% to 7%, or a shrinkage percentage of 1% to 25%, preferably 2% to 20%, more preferably 3% to 15%, An aerosol-generating article as described in any of Examples 1 to 13, wherein the shrinkage is measured in accordance with ISO 11501 "Measurement of dimensional change on heating" by using film specimens cut to 5 x 10 cm from a heat-shrinkable wrapper and placed in an oven in air at 120°C for 5 minutes, and the relative reduction in length of the film so treated compared to the original film is reported as the shrinkage. Example 15: An aerosol-generating article as described in any of Examples 1 to 14, wherein the heat-shrinkable wrapper has a length shrinkage in one or both of the machine direction and the cross direction of from 1% to 25%, preferably from 2% to 20%, more preferably from 3% to 15%, wherein the shrinkage is measured in length shrinkage according to Test Method A defined herein. Example 16: An aerosol-generating article as described in Example 15, wherein the shrinkage in the machine direction length exceeds the shrinkage in the cross direction length, and the cross direction of the heat-shrinkable wrapper is oriented parallel to the longitudinal axis of the aerosol-generating article. Example 17: An aerosol-generating article as described in Example 15, wherein the shrinkage in the transverse length exceeds the shrinkage in the machine direction length, and the machine direction of the heat-shrinkable wrapper is oriented parallel to the longitudinal axis of the aerosol-generating article. Example 18: An aerosol-generating article as described in any of Examples 1 to 17, wherein the heat-shrinkable wrapper has a shrinkage percentage of from 2% to 50%, preferably from 4% to 40%, more preferably from 6% to 30%, the shrinkage percentage being measured as area shrinkage percentage in accordance with Test Method A defined herein. Example 19: 19. The aerosol-generating article of any one of claims 1 to 18, wherein the heat-shrinkable wrapper comprises one or more of cellophane, cellulose hydrate, methylcellulose, carboxymethylcellulose, biaxially oriented polypropylene (BOPP), and low density polyethylene (LDPE). Example 20: 20. The aerosol-generating article of example 19, wherein the heat-shrinkable wrapper comprises one or more of a cellulose derivative, preferably cellulose hydrate, methyl cellulose, and carboxymethyl cellulose. Example 21: 21. The aerosol-generating article of example 20, wherein the heat-shrinkable wrapper comprises cellulose hydrate or cellophane. Example 22: 22. The aerosol-generating article of example 21, wherein the cellulose hydrate or cellophane is coated with polyvinylidene chloride (PVDC). Example 23: The aerosol-generating article of example 19, wherein the heat-shrinkable wrapper comprises biaxially oriented polypropylene (BOPP). Example 24: 20. The aerosol-generating article of any one of Examples 1-19, wherein the heat-shrinkable wrapper comprises a solid aerosol-forming substrate. Example 25: the solid aerosol-forming substrate comprises nicotine, one or more cellulosic agents, one or more aerosol formers, and one or more carboxylic acids that (i) contain no non-carboxyl alkyl hydroxyl groups and no ketone groups, or (ii) have a pKa in water at 25° C. of 3.5 or less, or (iii) contain no non-carboxyl alkyl hydroxyl groups, no ketone groups, and have a pKa in water at 25° C. of 3.5 or less; 25. The aerosol-generating article of example 24, wherein the solid aerosol-forming substrate has a total cellulosic agent content of at least 35 weight percent, a total aerosol former content of 45 weight percent or more, and a total carboxylic acid content of at least 0.5 weight percent. Example 26: The aerosol-generating article of example 24 or example 25, wherein the solid aerosol-forming substrate comprises one or more carboxylic acids selected from acetic acid, adipic acid, benzoic acid, citric acid, fumaric acid, maleic acid, malic acid, myristic acid, oxalic acid, salicylic acid, stearic acid, succinic acid, and undecanoic acid. Example 27: The aerosol-generating article of any one of Examples 24 to 26, wherein the solid aerosol-forming substrate comprises one or more carboxylic acids selected from acetic acid, adipic acid, benzoic acid, citric acid, fumaric acid, maleic acid, myristic acid, oxalic acid, salicylic acid, stearic acid, succinic acid, and undecanoic acid. Example 28: 28. The aerosol-generating article of example 27, wherein the solid aerosol-forming substrate comprises one or more carboxylic acids selected from acetic acid, benzoic acid, citric acid, fumaric acid, maleic acid, and malic acid. Example 29: 29. The aerosol-generating article of example 28, wherein the solid aerosol-forming substrate comprises one or more carboxylic acids selected from acetic acid, benzoic acid, citric acid, fumaric acid, and maleic acid. Example 30: 30. The aerosol-generating article of example 29, wherein the solid aerosol-forming substrate comprises one or more carboxylic acids selected from fumaric acid, maleic acid, and malic acid. Example 31: 31. The aerosol-generating article of example 30, wherein the solid aerosol-forming substrate comprises one or more carboxylic acids selected from fumaric acid and maleic acid. Example 32: 32. The aerosol-generating article of example 31, wherein the solid aerosol-forming substrate comprises fumaric acid. Example 33: 33. The aerosol-generating article of example 32, wherein the molar ratio of fumaric acid to nicotine in the solid aerosol-forming substrate is from 0.5:1 to 4:1. Example 34: 34. An aerosol-generating article according to any one of Examples 24 to 33, wherein the solid aerosol-forming substrate does not contain iota carrageenan or kappa carrageenan. Example 35: 35. The aerosol-generating article of any of Examples 24 to 34, wherein the solid aerosol-forming substrate further comprises one or more carboxylic acids selected from lactic acid and levulinic acid. Example 36: 36. The aerosol-generating article of any of Examples 24 to 35, wherein the solid aerosol-forming substrate has a total carboxylic acid content of from 1 weight percent to 6 weight percent. Example 37: 37. The aerosol-generating article of any one of Examples 24 to 36, wherein the molar ratio of total carboxylic acid to nicotine in the solid aerosol-forming substrate is from 0.5:1 to 5:1. Example 38: 38. The aerosol-generating article of any one of Examples 24 to 37, wherein the solid aerosol-forming substrate has a total cellulosic agent content of 35 weight percent to 50 weight percent. Example 39: 39. The aerosol-generating article of any of Examples 24 to 38, wherein the solid aerosol-forming substrate comprises one or more cellulosic film-forming agents selected from carboxymethylcellulose and hydroxypropylmethylcellulose. Example 40: 40. The aerosol-generating article of any one of Examples 24 to 39, wherein the solid aerosol-forming substrate comprises one or more cellulosic reinforcing agents selected from cellulose fibers, microcrystalline cellulose, and cellulose powder. Example 41: 41. The aerosol-generating article of any of Examples 24 to 40, wherein the aerosol-generating article comprises a susceptor, and the solid aerosol-forming substrate at least partially surrounds the susceptor. Example 42: 42. The aerosol-generating article according to any one of Examples 24 to 41, wherein the solid aerosol-forming substrate is a solid aerosol-forming film. Example 43: 43. The aerosol-generating article of any one of Examples 24 to 42, wherein the solid aerosol-forming film remains solid when heated to a temperature between 180 degrees Celsius and 350 degrees Celsius. Example 44: the aerosol-forming substrate portion comprises a primary aerosol-forming substrate and the heat-shrinkable wrapper comprises a secondary aerosol-forming substrate; one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate comprise one or more cellulosic agents, one or more aerosol formers, and one or more carboxylic acids; Preferably, the aerosol-generating article of any of Examples 1 to 19, wherein one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate comprise nicotine, one or more cellulosic agents, one or more aerosol formers, and one or more carboxylic acids. Example 45: The aerosol-generating article of example 44, wherein the secondary aerosol-forming substrate comprises one or more cellulosic agents, one or more aerosol formers, and one or more carboxylic acids. Example 46: The aerosol-generating article of example 44 or example 45, wherein the primary aerosol-forming substrate comprises a tobacco material. Example 47: 47. An aerosol-generating article according to any of Examples 44 to 46, wherein one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate have a total nicotine content of from 0.1 weight percent to 6 weight percent, more preferably from 0.5 weight percent to 4 weight percent, more preferably from 1.0 weight percent to 2.0 weight percent, more preferably from 1.2 weight percent to 1.8 weight percent, on a dry weight basis. Example 48: An aerosol-generating article according to any of Examples 44 to 47, wherein one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate comprise a total aerosol former content of at least 30 weight percent, more preferably at least 35 weight percent, more preferably at least 40 weight percent, more preferably at least 45 weight percent, more preferably at least 50 weight percent, on a dry weight basis. Example 49: The aerosol-generating article of any one of Examples 44 to 48, wherein the aerosol-forming body comprises glycerin. Example 50: 50. The aerosol-generating article of any of Examples 44 to 49, wherein one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate have a total carboxylic acid content of from 0.1 weight percent to 6 weight percent, preferably from 0.5 weight percent to 4 weight percent, more preferably from 1.0 weight percent to 2.5 weight percent, more preferably from 1.4 weight percent to 2.0 weight percent, on a dry weight basis. Example 51: One or more carboxylic acids (i) does not contain non-carboxyl alkyl hydroxyl groups and does not contain ketone groups; or (ii) has a pKa of 3.5 or less in water at 25°C; or (iii) An aerosol-generating article as described in any one of Examples 44 to 50, which does not contain a non-carboxyl alkyl hydroxyl group, does not contain a ketone group, and has a pKa in water at 25°C of 3.5 or less. Example 52: the one or more carboxylic acids are selected from lactic acid, levulinic acid, acetic acid, adipic acid, benzoic acid, citric acid, fumaric acid, maleic acid, malic acid, myristic acid, oxalic acid, salicylic acid, stearic acid, succinic acid, and undecanoic acid; Preferably, the one or more carboxylic acids are selected from acetic acid, adipic acid, benzoic acid, citric acid, fumaric acid, maleic acid, malic acid, myristic acid, oxalic acid, salicylic acid, stearic acid, succinic acid, and undecanoic acid; More preferably, the one or more carboxylic acids are selected from acetic acid, benzoic acid, citric acid, fumaric acid, maleic acid, and malic acid. Example 53: The aerosol-generating article of Example 52, wherein the one or more carboxylic acids are selected from fumaric acid, maleic acid, and malic acid, preferably the one or more carboxylic acids are selected from fumaric acid and maleic acid, and more preferably the one or more carboxylic acids are fumaric acid. Example 54: 54. The aerosol-generating article of any one of Examples 44 to 53, wherein one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate comprise fumaric acid. Example 55: An aerosol-generating article according to any of Examples 44 to 54, wherein one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate comprise a total tobacco content of less than 5 weight percent on a dry weight basis, preferably less than 4 weight percent, more preferably less than 3 weight percent, more preferably less than 2 weight percent, more preferably less than 1 weight percent, more preferably one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate are tobacco-free. Example 56: An aerosol-generating article according to any of Examples 44 to 55, wherein one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate have a total cellulosic agent content of from 35 weight percent to 55 weight percent, preferably from 40 weight percent to 50 weight percent, more preferably from 43 weight percent to 47 weight percent, on a dry weight basis. Example 57: An aerosol-generating article according to any one of Examples 44 to 56, wherein the cellulose-based agent comprises one or more cellulose-based film-forming agents selected from carboxymethylcellulose and hydroxypropylmethylcellulose. Example 58: An aerosol-generating article according to any one of Examples 44 to 57, wherein the cellulose-based agent comprises one or more cellulose-based reinforcing agents selected from cellulose fibers, microcrystalline cellulose, and cellulose powder. Example 59: 59. The aerosol-generating article of any one of Examples 44 to 58, wherein the cellulosic material comprises one or more of paper, wood, textiles, natural fibers, and man-made fibers. Example 60: the secondary aerosol-forming substrate comprises one or more cellulosic film-forming agents selected from carboxymethylcellulose and hydroxypropylmethylcellulose; Preferably, the secondary aerosol-forming substrate comprises one or more cellulosic film-forming agents selected from carboxymethylcellulose and hydroxypropylmethylcellulose, and one or more cellulosic reinforcing agents selected from cellulose fibers, microcrystalline cellulose and cellulose powder. An aerosol-generating article according to any one of Examples 44 to 59. Example 61: The aerosol-generating article of example 60, wherein the secondary aerosol-forming substrate comprises hydroxypropyl methylcellulose, the sodium salt of carboxymethylcellulose, and cellulose fibers. Example 62: 62. The aerosol-generating article of embodiment 61, wherein the secondary aerosol-forming substrate comprises, on a dry weight basis, 20 weight percent to 25 weight percent of hydroxypropyl methylcellulose, 4 weight percent to 7 weight percent of the sodium salt of carboxymethylcellulose, and 14 weight percent to 20 weight percent of cellulose fibers. Example 63: 63. An aerosol-generating article according to any of Examples 44 to 62, wherein one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate comprise nicotine and fumaric acid, preferably the molar ratio of fumaric acid to nicotine is from 1.2:1 to 1.8:1, more preferably from 1.3:1 to 1.7:1, more preferably from 1.4:1 to 1.6:1, more preferably about 1.5:1. Example 64: An aerosol-generating article according to any one of Examples 44 to 63, wherein one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate are provided in the form of a film or a gel. Example 65: An aerosol-generating article according to any of Examples 44 to 64, wherein one or both of the primary aerosol-forming substrate and the secondary aerosol-forming substrate are provided in the form of a solid aerosol-forming film, preferably the solid aerosol-forming film remains solid when heated to a temperature of from 180 degrees Celsius to 350 degrees Celsius. Example 66: An aerosol-generating article according to any one of Examples 44 to 65, wherein the primary aerosol-forming substrate and the secondary aerosol-forming substrate have the same composition, or the primary aerosol-forming substrate and the secondary aerosol-forming substrate have different compositions. Example 67: the heat shrinkable wrapper has a thickness of 60 micrometers or greater, preferably 100 micrometers or greater, more preferably 120 micrometers or greater, more preferably 150 micrometers or greater, more preferably 160 micrometers or greater, more preferably 170 micrometers or greater, more preferably 180 micrometers or greater, more preferably 190 micrometers or greater, more preferably 200 micrometers or greater; 67. An aerosol-generating article according to any one of Examples 44 to 66, wherein the heat shrinkable wrapper has a thickness of from 160 micrometers to 240 micrometers, preferably from 180 micrometers to 220 micrometers. Example 68: An aerosol-generating article according to any one of Examples 44 to 67, wherein the heat-shrinkable wrapper extends along the entire length of the aerosol-forming substrate portion, preferably the heat-shrinkable wrapper does not extend beyond the longitudinal ends of the aerosol-forming substrate portion. Example 69: An aerosol-generating article according to any one of Examples 44 to 68, wherein the heat-shrinkable wrapper has a single layer construction. Example 70: 70. The aerosol-generating article of any one of Examples 44-69, wherein the heat-shrinkable wrapper comprises a secondary aerosol-forming substrate. Example 71: The aerosol-generating article of example 69 or example 70, wherein the heat-shrinkable wrapper is an isotropic material. Example 72: An aerosol-generating article described in any of Examples 44 to 68, wherein the heat-shrinkable wrapper has a multi-layer structure, one of the layers of the multi-layer structure comprises a secondary aerosol-forming substrate, and preferably, the innermost layer facing the aerosol-forming substrate portion comprises a secondary aerosol-forming substrate. Example 73: 73. The aerosol-generating article of Example 72, wherein the multilayer structure is a bilayer structure. Example 74: The aerosol-generating article of example 72 or example 73, wherein the multilayer structure comprises a layer of paper, cardboard, plastic, or metal foil, preferably, the multilayer structure comprises an aluminum layer. Example 75: An aerosol generating system comprising an aerosol-generating article according to any one of Examples 1 to 74 and an aerosol generating device comprising a heating chamber configured to at least partially insert the aerosol-generating article within the heating chamber. Example 76: 76. The aerosol generation system of Example 75, wherein the aerosol generation device comprises an inductor coil.

[0099] Features described with respect to one embodiment may be equally applied to other embodiments of the invention. [Brief description of the drawings]

[0100] The invention will now be further described, by way of example only, with reference to the accompanying drawings in which:

[0101] [Figure 1a] 1a and 1d show an aerosol-generating article. [Figure 1b] Same as above. [Figure 2a] 2a and 2b show the aerosol-generating article before and after use. [Figure 2b] Same as above. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0102] 1a and 1b show, in cross-section, an aerosol-generating article, specifically an HNB article, prior to use.

[0103] The article of Figure la comprises a mouth end filter 10 located at the proximal end of the article. The article further comprises a PLA (polylactic acid) plug 12, a hollow acetate tube 14, and an aerosol-forming substrate portion 16 comprising an aerosol-forming substrate, such as reconstituted tobacco. The article is surrounded by a heat-shrinkable outer wrapper 18.

[0104] The outer diameter of the article may be about 7 millimeters. The overall length of the article may be about 45 millimeters. In one embodiment, the oral end filter 14 is about 15 millimeters long, the PLA plug 12 is about 10 millimeters long, the hollow acetate tube 14 is about 8 millimeters long, and the aerosol-forming substrate portion 16 is about 12 millimeters long. In one embodiment, the oral end 14 is about 12 millimeters long, the PLA plug 12 is about 13 millimeters long, the hollow acetate tube 14 is about 8 millimeters long, and the aerosol-forming substrate portion 16 is about 12 millimeters long.

[0105] The article of FIG. 1b is largely identical to that of FIG. 1a, except that the article of FIG. 1a comprises a sheet-like susceptor element 20 centrally disposed within the aerosol-forming substrate portion 16. As shown in FIG.

[0106] Figure 2a shows a cross-sectional view of a new aerosol-generating article, specifically an HNB article, prior to use. The article of Figure 2a comprises a mouth-end filter 10, a fine hollow acetate tube 22, a hollow acetate tube 14, an aerosol-forming substrate portion 16, and a front plug 24. The front plug 24 may be a filter plug. The article is surrounded by a heat-shrinkable outer wrapper 18.

[0107] The outer diameter of the article may be about 7 millimeters. The overall length of the article may be about 45 millimeters. In one embodiment, the mouth end filter 10 is about 12 millimeters long, the fine hollow acetate tube 22 is about 8 millimeters long, the hollow acetate tube 14 is about 8 millimeters long, the aerosol-forming substrate section 16 is about 12 millimeters long, and the front plug 24 is about 5 millimeters long. In one embodiment, the mouth end filter 10 is about 12 millimeters long, the fine hollow acetate tube 22 is about 8 millimeters long, the hollow acetate tube 14 is about 7 millimeters long, the aerosol-forming substrate section 16 is about 12 millimeters long, and the front plug 24 is about 6 millimeters long.

[0108] The article of FIG. 2 a may also include a susceptor element (not shown) disposed within the aerosol-forming substrate portion 16 .

[0109] Figure 2b shows the aerosol-generating article of Figure 2a after use. The used article of Figure 2b comprises a region 26 having a reduced outer diameter. During use, the aerosol-forming substrate portion 16 was heated. A portion of the heat-shrinkable wrapper 18 surrounding the aerosol-forming substrate portion 16 was also heated due to heat transfer from one or both of the heated aerosol-forming substrate portion 16 and an external heating element. When exposed to heat during use, the heat-shrinkable wrapper 18 shrinks in the region 26 surrounding the aerosol-forming substrate portion 18. The shrinkage of the heat-shrinkable wrapper 18 compressed the surrounded aerosol-forming substrate portion 18. This reduces the outer diameter of the used aerosol-generating article in the region 26.

[0110] The front plug 24 and hollow acetate tube 14 function as fasteners for the heat shrink wrapper 18 .

[0111] From the reduced diameter in Figure 2b, a user may visually verify whether a given item is a new item as shown in Figure 2a, or a used item as shown in Figure 2b, thus avoiding a user mistaking a used item for an unused item and attempting to reuse the used item.

Claims

1. 1. An aerosol-generating article comprising an aerosol-forming substrate portion and a heat-shrinkable wrapper at least partially surrounding the aerosol-forming substrate portion, wherein the heat-shrinkable wrapper has a length shrinkage of 1% to 25% at a temperature of 120 degrees Celsius or less; The aerosol-generating article is configured as a heat-non-combustion type article to be used together with an aerosol generating device.

2. 2. The aerosol-generating article of claim 1, wherein the heat-shrinkable wrapper at least partially surrounds a fastening element, the fastening element being one or more of a filter element, a hollow tubular element, and a front plug.

3. 2. The aerosol-generating article of claim 1, further comprising a front plug disposed at the distal end of the aerosol-generating article, the front plug preferably being configured as a fastening element and the heat-shrinkable wrapper at least partially surrounding the front plug.

4. 4. An aerosol-generating article according to claim 3, wherein the length of the front plug is at least 4 millimeters, preferably at least 5 millimeters, more preferably at least 6 millimeters.

5. 2. The aerosol-generating article according to claim 1, wherein the length of the aerosol-forming substrate portion is between 9 millimeters and 15 millimeters, preferably between 11 millimeters and 13 millimeters, and more preferably about 12 millimeters.

6. 2. The aerosol-generating article of claim 1, comprising a susceptor element, preferably said susceptor element being surrounded by said aerosol-forming substrate portion.

7. 2. The aerosol-generating article of claim 1, wherein the aerosol-forming substrate portion comprises an aerosol former, preferably the aerosol former is selected from one or more of a polyhydric alcohol, an ester of a polyhydric alcohol, and an aliphatic ester of a monocarboxylic acid, a dicarboxylic acid, or a polycarboxylic acid, more preferably the aerosol former comprises a polyhydric alcohol or a mixture thereof, more preferably the aerosol former comprises glycerin.

8. 8. The aerosol-generating article of claim 7, wherein the aerosol-forming substrate portion comprises an aerosol former content of 5 weight percent or more on a dry weight basis, preferably 5 to 30 weight percent on a dry weight basis.

9. 2. The aerosol-generating article of claim 1, wherein the heat-shrinkable wrapper has a length shrinkage in one or both of the machine direction and the cross direction of from 1% to 25%, preferably from 2% to 20%, more preferably from 3% to 15%, the shrinkage being measured in length according to Test Method A defined herein.

10. 10. The aerosol-generating article of claim 9, wherein the shrinkage percentage in the machine direction length of the heat-shrinkable wrapper exceeds the shrinkage percentage in the transverse direction length of the heat-shrinkable wrapper, and the transverse direction of the heat-shrinkable wrapper is oriented parallel to the longitudinal axis of the aerosol-generating article.

11. 10. The aerosol-generating article of claim 1, wherein the heat-shrinkable wrapper comprises one or more of cellophane, cellulose hydrate, methyl cellulose, carboxymethyl cellulose, biaxially oriented polypropylene (BOPP), and low-density polyethylene (LDPE).

12. 12. The aerosol-generating article of claim 11, wherein the heat-shrinkable wrapper comprises cellulose hydrate or cellophane.

13. 12. The aerosol-generating article of claim 11, wherein the heat-shrinkable wrapper comprises biaxially oriented polypropylene (BOPP).

14. 14. An aerosol generation system comprising: an aerosol-generating article according to any one of claims 1 to 13; and an aerosol generating device comprising a heating chamber configured to at least partially insert the aerosol-generating article into the heating chamber.

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