Aerosol-generating article with a wrapper having a metal layer

Abstract

The aerosol-generating article (100) comprises an aerosol-forming substrate having one or more aerosol formers therein, and a wrapper (70). The wrapper (70) is wrapped around the aerosol-forming substrate. The wrapper (70) comprises a metal layer. The aerosol-forming substrate has an aerosol former content of 40 weight percent or greater.

Description

[Technical field]

[0001] The present invention relates to an aerosol-generating article having a wrapper with a metal layer. [Background technology]

[0002] An aerosol generating system for delivering an aerosol to a user typically comprises an aerosol generating article and an atomizer. The aerosol generating article comprises an aerosol-forming substrate. The atomizer is configured to generate an inhalable aerosol from the aerosol-forming substrate. Some known aerosol generating systems comprise a thermal atomizer, such as an electric heater or an induction heating device. The thermal atomizer is configured to heat and vaporize the aerosol-forming substrate to generate an aerosol that can be inhaled by the user. A typical aerosol-forming substrate for use in an aerosol generating system is a nicotine formulation, which may be a liquid nicotine formulation that includes an aerosol former such as glycerin.

[0003] It would be desirable to provide an aerosol-generating article that provides improved nicotine delivery.

[0004] An aerosol-generating article is provided. The aerosol-generating article may include an aerosol-forming substrate. The aerosol-forming substrate may comprise one or more aerosol formers. The aerosol-generating article may include a wrapper. The wrapper may be wrapped around the aerosol-forming substrate. The wrapper may comprise a metal layer. The aerosol-forming substrate may have an aerosol former content of 40 weight percent or greater.

[0005] Also provided is an aerosol-generating article comprising an aerosol-forming substrate comprising one or more aerosol formers, and a wrapper, the wrapper wrapped around the aerosol-forming substrate, the wrapper comprising a metal layer, and the aerosol-forming substrate having an aerosol former content of 40 weight percent or greater.

[0006] Also provided is an aerosol-generating system. The aerosol-generating system may comprise an aerosol-generating article. The aerosol-generating article may include an aerosol-forming substrate. The aerosol-forming substrate may comprise one or more aerosol formers. The aerosol-generating article may comprise a wrapper. The wrapper may be wrapped around the aerosol-forming substrate. The wrapper may comprise a metal layer. The aerosol-forming substrate may have an aerosol former content of 40 percent by weight or greater.

[0007] There is also provided an aerosol-generating system comprising an aerosol-generating article, the aerosol-generating article comprising an aerosol-forming substrate comprising one or more aerosol formers, and a wrapper, the wrapper being wrapped around the aerosol-forming substrate, the wrapper comprising a metal layer, and the aerosol-forming substrate having an aerosol former content of 40 weight percent or more.

[0008] By providing a wrapper wrapped around the aerosol-forming substrate and including a metal layer, better nicotine delivery is provided when the aerosol-forming substrate comprises a large amount of aerosol former.

[0009] The inventors believe that the metal layer may form a barrier between the surface of the aerosol-forming substrate and other components of the aerosol-generating article, which may reduce the migration of one or more components of the aerosol-forming substrate, such as the aerosol former, out of the aerosol-forming substrate and into other components of the aerosol-generating article.

[0010] An increase in the amount of nicotine delivered from the aerosol-forming substrate may be caused by a barrier that reduces the migration of one or more components of the aerosol-forming substrate out of the aerosol-forming substrate. Summary of the Invention

[0011] The term "aerosol-generating article" as used herein refers to an article for generating an aerosol. An aerosol-generating article typically comprises an aerosol-forming substrate suitable and intended to be heated or burned to release volatile compounds capable of forming an aerosol. A conventional cigarette is ignited when a user lights 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 end of the cigarette to ignite, and the resulting combustion produces inhalable smoke. In contrast, in a "heated aerosol-generating article", the aerosol is generated by heating the aerosol-forming substrate, rather than by combustion of the aerosol-forming substrate. Known heated aerosol-generating articles include, for example, electrically heated aerosol-generating articles.

[0012] As used herein, the term "aerosol-forming substrate" refers to a substrate capable of generating, upon heating, a volatile compound capable of forming an aerosol. The aerosol generated from the aerosol-forming substrate may be visible or invisible to the human eye and may include vapor (e.g., gaseous particles of a substance that is normally liquid or solid at room temperature), as well as gas and liquid droplets of condensed vapor.

[0013] The term "susceptor element" as used herein with respect to the present invention refers to a material capable of converting electromagnetic energy into heat. Eddy currents induced in the susceptor element result in heating of the susceptor element when it is located within a varying electromagnetic field. When the susceptor element is in thermal contact with an aerosol-forming substrate, the aerosol-forming substrate is heated by the susceptor element.

[0014] The wrapper may include a metal layer.

[0015] The wrapper may include a paper layer.

[0016] As used herein, the term "paper layer" is used to describe a layer formed from cellulosic fibers.

[0017] The paper layer may be a non-metallic layer, in other words, the paper layer is not a metal layer or an alloy layer.

[0018] The metal layer may be radially inward of the paper layer.

[0019] Alternatively, the metal layer may be radially outward of the paper layer.

[0020] The wrapper may include a metal layer deposited on the paper layer. The metal layer may be formed by physical vapor deposition. Advantageously, by depositing the metal layer on the paper layer, the wrapper may be thin. If the aerosol-generating article includes a susceptor, a thin wrapper may result in less interaction with magnetic fields, and the wrapper may not significantly change the electromagnetic properties of the aerosol-generating article. Furthermore, using a thin metal layer may reduce the amount of metal required to form the metal layer, which may improve sustainability.

[0021] The wrapper may include a laminate of a metal layer secured to a paper layer. The metal layer may be formed by lamination. Advantageously, the use of lamination may provide a wrapper that is easier to manufacture. Additionally, lamination may result in a more homogeneous layer. Additionally, lamination may be a better option than deposition for externally heated aerosol-generating articles due to increased heat transfer due to better thermal conductivity of thicker layers.

[0022] The wrapper may be wrapped around at least 50 percent of the total length of the aerosol-forming substrate. The wrapper may be wrapped around at least 80 percent of the total length of the aerosol-forming substrate. The wrapper may be wrapped around at least 90 percent of the total length of the aerosol-forming substrate. The wrapper may be wrapped around at least 95 percent of the total length of the aerosol-forming substrate.

[0023] The aerosol-generating article may include a plug containing the aerosol-forming substrate. The plug may be formed from a porous material. A wrapper may be wrapped around the plug.

[0024] The aerosol-generating article may comprise a rod of the aerosol-forming substrate. A wrapper may be wrapped around the rod.

[0025] If the metal layer is too thin, it may be impossible to manufacture and it may have poorer anti-capillary properties, however, if the metal layer is too thick, it may have greater interactions with the magnetic field when the aerosol-generating article is inductively heated and it may be more expensive to manufacture.

[0026] The metal layer may have a thickness of 2 nanometers or more. The metal layer may have a thickness of 5 nanometers or more. The metal layer may have a thickness of 10 nanometers or more. The metal layer may have a thickness of 15 nanometers or more. The metal layer may have a thickness of 20 nanometers or more. The metal layer may have a thickness of 25 nanometers or more. The metal layer may have a thickness of 30 nanometers or more. The metal layer may have a thickness of 40 nanometers or more. The metal layer may have a thickness of 50 nanometers or more.

[0027] The metal layer may have a thickness of less than 6000 nanometers. The metal layer may have a thickness of less than 4000 nanometers. The metal layer may have a thickness of less than 2000 nanometers. The metal layer may have a thickness of less than 1000 nanometers. The metal layer may have a thickness of less than 500 nanometers. The metal layer may have a thickness of less than 200 nanometers. The metal layer may have a thickness of less than 100 nanometers. The metal layer may have a thickness of less than 90 nanometers. The metal layer may have a thickness of less than 80 nanometers. The metal layer may have a thickness of less than 70 nanometers. The metal layer may have a thickness of less than 60 nanometers. The metal layer may have a thickness of less than 50 nanometers.

[0028] The metal layer may have a thickness of 2 nanometers to 100 nanometers. The metal layer may have a thickness of 2 nanometers to 90 nanometers. The metal layer may have a thickness of 2 nanometers to 80 nanometers. The metal layer may have a thickness of 2 nanometers to 70 nanometers. The metal layer may have a thickness of 2 nanometers to 60 nanometers. The metal layer may have a thickness of 2 nanometers to 50 nanometers.

[0029] The metal layer may have a thickness of 5 nanometers to 100 nanometers. The metal layer may have a thickness of 10 nanometers to 100 nanometers. The metal layer may have a thickness of 15 nanometers to 100 nanometers. The metal layer may have a thickness of 20 nanometers to 100 nanometers. The metal layer may have a thickness of 25 nanometers to 100 nanometers. The metal layer may have a thickness of 30 nanometers to 100 nanometers. The metal layer may have a thickness of 40 nanometers to 100 nanometers. The metal layer may have a thickness of 50 nanometers to 100 nanometers.

[0030] The metal layer may have a thickness of 5 nanometers to 90 nanometers. The metal layer may have a thickness of 5 nanometers to 80 nanometers. The metal layer may have a thickness of 10 nanometers to 80 nanometers. The metal layer may have a thickness of 10 nanometers to 70 nanometers. The metal layer may have a thickness of 10 nanometers to 60 nanometers. The metal layer may have a thickness of 15 nanometers to 60 nanometers. The metal layer may have a thickness of 15 nanometers to 50 nanometers. The metal layer may have a thickness of 20 nanometers to 50 nanometers. The metal layer may have a thickness of 20 nanometers to 40 nanometers. The metal layer may have a thickness of 25 nanometers to 40 nanometers. The metal layer may have a thickness of 25 nanometers to 30 nanometers.

[0031] The metal layer may include one or more of aluminum, chromium, copper, gold, nickel, silver, and tin. The metal layer may be formed from aluminum. The metal layer may include an aluminum layer. Advantageously, aluminum has a relatively low boiling point, which may make it easier to form the metal layer, especially when using vapor deposition methods. Additionally, aluminum has a low cost compared to other metals.

[0032] If the paper layer is too thin, it may not provide sufficient tear resistance, if the paper layer is too thick, the wrapper may be too difficult to rotate during production, which may reduce the production rate of the aerosol-generating article.

[0033] The paper layer may have a thickness of 10 micrometers or more.The paper layer may have a thickness of 20 micrometers or more.The paper layer may have a thickness of 40 micrometers or more.

[0034] The paper layer may have a thickness of less than 120 micrometers.The paper layer may have a thickness of less than 100 micrometers.The paper layer may have a thickness of less than 80 micrometers.

[0035] The paper layer may have a thickness of 10 micrometers to 120 micrometers.The paper layer may have a thickness of 10 micrometers to 100 micrometers.The paper layer may have a thickness of 10 micrometers to 80 micrometers.

[0036] The paper layer may have a thickness of 20 micrometers to 120 micrometers.The paper layer may have a thickness of 20 micrometers to 100 micrometers.The paper layer may have a thickness of 20 micrometers to 80 micrometers.

[0037] The paper layer may have a thickness of 40 micrometers to 120 micrometers.The paper layer may have a thickness of 40 micrometers to 100 micrometers.The paper layer may have a thickness of 40 micrometers to 80 micrometers.

[0038] The aerosol-generating article may comprise an upstream element located upstream of the aerosol-forming substrate. The upstream element may be located adjacent to the aerosol-forming substrate.

[0039] Advantageously, providing an upstream element in combination with the metal layer of the wrapper may result in reduced migration of one or more components of the aerosol-forming substrate to other parts of the aerosol-generating article.

[0040] The upstream element may include a porous element, which may not significantly change the draw resistance of the aerosol-generating article.

[0041] The upstream element may include an annular element.

[0042] The wrapper may be wrapped around at least a portion of the upstream element. The wrapper may be wrapped around at least 5 percent of the length of the upstream element. The wrapper may be wrapped around at least 10 percent of the length of the upstream element. The wrapper may be wrapped around at least 20 percent of the length of the upstream element. The wrapper may be wrapped around at least 30 percent of the length of the upstream element. The wrapper may be wrapped around at least 40 percent of the length of the upstream element. The wrapper may be wrapped around at least 50 percent of the length of the upstream element. The wrapper may be wrapped around the entire length of the upstream element.

[0043] Advantageously, providing a wrapper over at least a portion of the upstream element may reduce migration of components of the aerosol-forming substrate through the junction between the aerosol-forming substrate and the upstream element.

[0044] The upstream element may be made of any material suitable for use in an aerosol-generating article. The upstream element may be made of the same material as that used in one of the other components of the aerosol-generating article. Suitable materials for forming the upstream element include filter material, ceramic, polymeric material, cellulose acetate, cardboard, zeolite, or an aerosol-generating substrate. The upstream element may be formed from a plug of cellulose acetate.

[0045] The upstream element may be formed from a heat resistant material, for example the upstream element may be formed from a material that can withstand temperatures up to 350 degrees Celsius, ensuring that the upstream element is not adversely affected by the heating means for heating the aerosol-generating substrate.

[0046] The upstream element may have a diameter approximately equal to the diameter of the aerosol-generating article.

[0047] The upstream element may have a length between 1 mm and 10 mm. The upstream element may have a length between 3 mm and 8 mm. The upstream element may have a length between 4 mm and 6 mm.

[0048] The upstream element may have a length of 5 millimeters.

[0049] The length of the upstream element may be advantageously varied to provide a desired overall length of the aerosol-generating article, for example, if it is desired to reduce the length of one of the other components of the aerosol-generating article, the length of the upstream element may be increased to maintain the same overall length of the article.

[0050] The aerosol-generating article comprises a downstream element located downstream of the aerosol-forming substrate. The downstream element may be located adjacent to the aerosol-forming substrate.

[0051] Advantageously, providing a downstream element in combination with the metal layer of the wrapper may result in reduced migration of one or more components of the aerosol-forming substrate to other parts of the aerosol-generating article.

[0052] The wrapper may be wrapped around at least a portion of the downstream element. The wrapper may be wrapped around at least 5 percent of the length of the downstream element. The wrapper may be wrapped around at least 10 percent of the length of the downstream element. The wrapper may be wrapped around at least 20 percent of the length of the downstream element. The wrapper may be wrapped around at least 30 percent of the length of the downstream element. The wrapper may be wrapped around at least 40 percent of the length of the downstream element. The wrapper may be wrapped around at least 50 percent of the length of the downstream element. The wrapper may be wrapped around the entire length of the downstream element.

[0053] Advantageously, providing a wrapper over at least a portion of the downstream element may reduce migration of components of the aerosol-forming substrate through the junction between the aerosol-forming substrate and the downstream element.

[0054] The downstream element may be made of any material suitable for use in an aerosol-generating article. The downstream element may be made of the same material as that used in one of the other components of the aerosol-generating article. Suitable materials for forming the downstream element include filter material, ceramic, polymeric material, cellulose acetate, cardboard, zeolite, or an aerosol-generating substrate. The downstream element may be formed from a plug of cellulose acetate.

[0055] The downstream element may be formed from a heat resistant material, for example the upstream element may be formed from a material that can withstand temperatures up to 350 degrees Celsius. This may ensure that the downstream element is not adversely affected by the heating means for heating the aerosol-generating substrate.

[0056] The downstream element may comprise a hollow tubular segment, which may also be located adjacent to the aerosol-forming substrate.

[0057] The hollow tubular segment may include a cellulose acetate tube.The hollow tubular segment may include two cellulose acetate tubes.

[0058] Advantageously, providing a wrapper over at least a portion of the hollow tubular segment may reduce migration of components of the aerosol-forming substrate through the joint between the aerosol-forming substrate and the hollow tubular segment.

[0059] The downstream element may be located adjacent to the aerosol-forming substrate.

[0060] The downstream element may comprise a hollow tubular segment.

[0061] The downstream element may include a filter plug element.

[0062] The downstream element may include a second hollow tubular segment. The second hollow tubular segment may be located adjacent to the hollow tubular segment.

[0063] The wrapper may be wrapped around at least a portion of the second hollow tubular segment. The wrapper may be wrapped around at least 5 percent of the length of the second hollow tubular segment. The wrapper may be wrapped around at least 10 percent of the length of the second hollow tubular segment. The wrapper may be wrapped around at least 20 percent of the length of the second hollow tubular segment. The wrapper may be wrapped around at least 30 percent of the length of the second hollow tubular segment. The wrapper may be wrapped around at least 40 percent of the length of the second hollow tubular segment. The wrapper may be wrapped around at least 50 percent of the length of the second hollow tubular segment. The wrapper may be wrapped around the entire length of the second hollow tubular segment.

[0064] The downstream element may comprise a mouthpiece element at its downstream end. The mouthpiece element may comprise an oral-end cavity. The oral-end cavity may be defined by a hollow tubular element mounted at the downstream end of the mouthpiece element. Alternatively, the oral-end cavity may be defined by an outer wrapper, the wrapper extending in a downstream direction from the mouthpiece element.

[0065] The wrapper may be wrapped around at least a portion of the mouthpiece element. The wrapper may be wrapped around at least 5 percent of the length of the mouthpiece element. The wrapper may be wrapped around at least 10 percent of the length of the mouthpiece element. The wrapper may be wrapped around at least 20 percent of the length of the mouthpiece element. The wrapper may be wrapped around at least 30 percent of the length of the mouthpiece element. The wrapper may be wrapped around at least 40 percent of the length of the mouthpiece element. The wrapper may be wrapped around at least 50 percent of the length of the mouthpiece element. The wrapper may be wrapped around the entire length of the mouthpiece element.

[0066] In an aerosol-generating article, the upstream element, the aerosol-forming substrate, the hollow tubular segment, the second hollow tubular segment, and the mouthpiece element may be referred to as elements of the aerosol-generating article.

[0067] The wrapper may be wrapped around at least one element of the aerosol-generating article. The wrapper may be wrapped around at least two elements of the aerosol-generating article. The wrapper may be wrapped around at least three elements of the aerosol-generating article. The wrapper may be wrapped around at least four elements of the aerosol-generating article. The wrapper may be wrapped around at least five elements of the aerosol-generating article. The wrapper may be wrapped around all elements of the aerosol-generating article. For example, in an aerosol-generating article comprising an upstream element, an aerosol-forming substrate, a hollow tubular segment, a second hollow tubular segment, and a mouthpiece element, the wrapper may be wrapped around all of these elements.

[0068] The wrapper may be wrapped around at least 25 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 30 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 35 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 40 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 45 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 50 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 55 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 60 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 65 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 70 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 75 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 80 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 85 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 90 percent of the length of the aerosol-generating article. The wrapper may be wrapped around at least 95 percent of the length of the aerosol-generating article. The wrapper may be wrapped around 100 percent of the length of the aerosol-generating article.

[0069] The wrapper may be wrapped around substantially the entire length of the aerosol-generating article.The wrapper may be wrapped around the entire length of the aerosol-generating article.

[0070] One or more of the elements of the aerosol-generating article may be provided with an element wrapper wrapped around substantially the entire length of the element.One or more of the elements of the aerosol-generating article may be provided with an element wrapper wrapped around the entire length of the element.

[0071] For example, the aerosol-forming substrate may comprise an element wrapper wrapped around the length of the rod of the aerosol-forming substrate. The upstream element may comprise an element wrapper wrapped around the length of the upstream element. The hollow tubular segment may comprise an element wrapper wrapped around the length of the hollow tubular segment. The second hollow tubular segment may comprise an element wrapper wrapped around the length of the second hollow tubular segment. The mouthpiece element may comprise an element wrapper wrapped around the length of the mouthpiece element.

[0072] When the wrapper is wrapped around the length of at least two elements of the aerosol-generating article, it is preferred that one or more of the elements is provided with an element wrapper.

[0073] The element wrapper may include a paper layer.

[0074] A wrapper may be wrapped around and on top of one or more element wrappers.

[0075] The aerosol-forming substrate may comprise a gel. The aerosol-forming substrate may comprise a film. The aerosol-forming substrate may comprise crimped tobacco. The aerosol-forming substrate may comprise cut tobacco filler.

[0076] The aerosol-forming substrate may comprise a colloid. A colloid may have discrete solid particles dispersed in a continuous liquid. A colloid may have discrete liquid particles dispersed in a continuous liquid. A colloid may have discrete liquid particles dispersed in a continuous solid.

[0077] The aerosol-forming substrate may be a solid.

[0078] The aerosol-forming substrate may be a film.

[0079] As used herein, the term "weight percent" refers to dry weight unless otherwise indicated.

[0080] The aerosol-forming substrate may have an aerosol former content of greater than 5 percent by weight. The aerosol-forming substrate may have an aerosol former content of greater than 10 percent by weight. The aerosol-forming substrate may have an aerosol former content of greater than 15 percent by weight. The aerosol-forming substrate may have an aerosol former content of greater than 20 percent by weight. The aerosol-forming substrate may have an aerosol former content of greater than 25 percent by weight. The aerosol-forming substrate may have an aerosol former content of greater than 30 percent by weight. The aerosol-forming substrate may have an aerosol former content of greater than 35 percent by weight. The aerosol-forming substrate may have an aerosol former content of greater than 40 percent by weight. The aerosol-forming substrate may have an aerosol former content of greater than 45 percent by weight. The aerosol-forming substrate may have an aerosol former content of greater than 50 percent by weight. The aerosol-forming substrate may have an aerosol former content of 60 percent by weight or greater. The aerosol-forming substrate may have an aerosol former content of 70 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 80 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 90 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 95 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 97 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 99 percent by weight or more.

[0081] The aerosol-forming substrate may have an aerosol former content of 99 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 97 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 95 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of less than 90 percent by weight. The aerosol-forming substrate may have an aerosol former content of less than 80 percent by weight. The aerosol-forming substrate may have an aerosol former content of less than 70 percent by weight. The aerosol-forming substrate may have an aerosol former content of less than 60 percent by weight.

[0082] The aerosol-forming substrate may have an aerosol former content of 40 to 90 percent by weight. The aerosol-forming substrate may have an aerosol former content of 40 to 80 percent by weight. The aerosol-forming substrate may have an aerosol former content of 40 to 70 percent by weight. The aerosol-forming substrate may have an aerosol former content of 40 to 60 percent by weight. The aerosol-forming substrate may have an aerosol former content of 40 to 50 percent by weight.

[0083] The aerosol-forming substrate may have an aerosol former content of 40 percent to 90 percent by weight. The aerosol-forming substrate may have an aerosol former content of 50 percent to 90 percent by weight. The aerosol-forming substrate may have an aerosol former content of 60 percent to 90 percent by weight. The aerosol-forming substrate may have an aerosol former content of 70 percent to 90 percent by weight. The aerosol-forming substrate may have an aerosol former content of 80 percent to 90 percent by weight.

[0084] The aerosol-forming substrate may have an aerosol former content of 50 to 90 percent by weight. The aerosol-forming substrate may have an aerosol former content of 50 to 80 percent by weight. The aerosol-forming substrate may have an aerosol former content of 60 to 80 percent by weight. The aerosol-forming substrate may have an aerosol former content of 60 to 70 percent by weight.

[0085] The aerosol-forming substrate may have an aerosol former content of 100 percent by weight or more.The aerosol-forming substrate may have an aerosol former content of 200 percent by weight or more.The aerosol-forming substrate may have an aerosol former content of 250 percent by weight or more.

[0086] The aerosol-forming substrate may have an aerosol former content of less than 500 percent by weight.The aerosol-forming substrate may have an aerosol former content of less than 400 percent by weight.The aerosol-forming substrate may have an aerosol former content of less than 300 percent by weight.

[0087] The aerosol-forming substrate may have an aerosol former content of 100 milligrams to 500 milligrams. The aerosol-forming substrate may have an aerosol former content of 100 milligrams to 400 milligrams. The aerosol-forming substrate may have an aerosol former content of 200 milligrams to 400 milligrams. The aerosol-forming substrate may have an aerosol former content of 200 milligrams to 300 milligrams.

[0088] The aerosol-forming substrate may have an aerosol former content of 0.05 grams per cubic centimeter or more.The aerosol-forming substrate may have an aerosol former content of 0.1 grams per cubic centimeter or more.

[0089] The aerosol-forming substrate may have an aerosol former content of less than 0.3 grams per cubic centimeter.The aerosol-forming substrate may have an aerosol former content of less than 0.25 grams per cubic centimeter.

[0090] The aerosol-forming substrate may have an aerosol former content of from 0.05 grams per cubic centimeter to 0.3 grams per cubic centimeter.The aerosol-forming substrate may have an aerosol former content of from 0.1 grams per cubic centimeter to 0.25 grams per cubic centimeter.

[0091] The one or more aerosol formers may include glycerin.The one or more aerosol formers may include propylene glycol.The one or more aerosol formers may include glycerin and propylene glycol.

[0092] The aerosol-forming substrate may comprise water.

[0093] The aerosol-forming substrate may have a water content of 10 percent by weight or more.The aerosol-forming substrate may have a water content of 15 percent by weight or more.The aerosol-forming substrate may have a water content of 20 percent by weight or more.

[0094] The aerosol-forming substrate may have a water content of less than 30 percent by weight.The aerosol-forming substrate may have a water content of less than 25 percent by weight.The aerosol-forming substrate may have a water content of less than 20 percent by weight.

[0095] The aerosol-forming substrate may have a water content of 10 to 30 percent by weight. The aerosol-forming substrate may have a water content of 10 to 25 percent by weight. The aerosol-forming substrate may have a water content of 15 to 25 percent by weight. The aerosol-forming substrate may have a water content of 15 to 20 percent by weight. The aerosol-forming substrate may have a water content of 20 to 25 percent by weight.

[0096] The aerosol-forming substrate may comprise nicotine.

[0097] The aerosol-forming substrate may have a nicotine content of 0.5 percent by weight or more. The aerosol-forming substrate may have a nicotine content of 1 percent by weight or more. The aerosol-forming substrate may have a nicotine content of 1.5 percent by weight or more. The aerosol-forming substrate may have a nicotine content of 2 percent by weight or more. The aerosol-forming substrate may have a nicotine content of 2.5 percent by weight or more. The aerosol-forming substrate may have a nicotine content of 5 percent by weight or more.

[0098] The aerosol-forming substrate may have a nicotine content of less than 5 percent by weight.The aerosol-forming substrate may have a nicotine content of less than 2.5 percent by weight.The aerosol-forming substrate may have a nicotine content of less than 2 percent by weight.The aerosol-forming substrate may have a nicotine content of less than 1.5 percent by weight.

[0099] The aerosol-forming substrate may have a nicotine content of 0.5 percent by weight to 5 percent by weight. The aerosol-forming substrate may have a nicotine content of 0.5 percent by weight to 2.5 percent by weight. The aerosol-forming substrate may have a nicotine content of 1 percent by weight to 2.5 percent by weight. The aerosol-forming substrate may have a nicotine content of 1 percent by weight to 2 percent by weight. The aerosol-forming substrate may have a nicotine content of 1.5 percent by weight to 2 percent by weight. The aerosol-forming substrate may have a nicotine content of 1 percent by weight to 1.5 percent by weight.

[0100] The aerosol-forming substrate may comprise a film-forming agent.

[0101] The film former may include a cellulosic film former.

[0102] The cellulosic film former can be carboxymethyl cellulose.

[0103] The carboxymethylcellulose can be sodium carboxymethylcellulose.

[0104] The aerosol-forming substrate may have a film-former content of 0.5 weight percent or more. The aerosol-forming substrate may have a film-former content of 1 weight percent or more. The aerosol-forming substrate may have a film-former content of 1.5 weight percent or more. The aerosol-forming substrate may have a film-former content of 2 weight percent or more. The aerosol-forming substrate may have a film-former content of 2.4 weight percent or more. The aerosol-forming substrate may have a film-former content of 2.5 weight percent or more.

[0105] The aerosol-forming substrate may have a film-former content of less than 5 percent by weight. The aerosol-forming substrate may have a film-former content of less than 4 percent by weight. The aerosol-forming substrate may have a film-former content of less than 3 percent by weight. The aerosol-forming substrate may have a film-former content of less than 2.5 percent by weight.

[0106] The aerosol-forming substrate may have a film-former content of 0.5 weight percent to 5 weight percent. The aerosol-forming substrate may have a film-former content of 0.5 weight percent to 4 weight percent. The aerosol-forming substrate may have a film-former content of 1 weight percent to 4 weight percent. The aerosol-forming substrate may have a film-former content of 1 weight percent to 3 weight percent. The aerosol-forming substrate may have a film-former content of 1.5 weight percent to 3 weight percent. The aerosol-forming substrate may have a film-former content of 1.5 weight percent to 2.5 weight percent. The aerosol-forming substrate may have a film-former content of 2 weight percent to 2.5 weight percent.

[0107] The aerosol-forming substrate may have a carboxymethylcellulose content of 0.5 percent by weight or more. The aerosol-forming substrate may have a carboxymethylcellulose content of 1 percent by weight or more. The aerosol-forming substrate may have a carboxymethylcellulose content of 1.5 percent by weight or more. The aerosol-forming substrate may have a carboxymethylcellulose content of 2 percent by weight or more. The aerosol-forming substrate may have a carboxymethylcellulose content of 2.4 percent by weight or more. The aerosol-forming substrate may have a carboxymethylcellulose content of 2.5 percent by weight or more.

[0108] The aerosol-forming substrate may have a carboxymethylcellulose content of less than 5 percent by weight. The aerosol-forming substrate may have a carboxymethylcellulose content of less than 4 percent by weight. The aerosol-forming substrate may have a carboxymethylcellulose content of less than 3 percent by weight. The aerosol-forming substrate may have a carboxymethylcellulose content of less than 2.5 percent by weight.

[0109] The aerosol-forming substrate may have a carboxymethylcellulose content of 0.5 weight percent to 5 weight percent. The aerosol-forming substrate may have a carboxymethylcellulose content of 0.5 weight percent to 4 weight percent. The aerosol-forming substrate may have a carboxymethylcellulose content of 1 weight percent to 4 weight percent. The aerosol-forming substrate may have a carboxymethylcellulose content of 1 weight percent to 3 weight percent. The aerosol-forming substrate may have a carboxymethylcellulose content of 1.5 weight percent to 3 weight percent. The aerosol-forming substrate may have a carboxymethylcellulose content of 1.5 weight percent to 2.5 weight percent. The aerosol-forming substrate may have a carboxymethylcellulose content of 2 weight percent to 2.5 weight percent.

[0110] The aerosol-forming substrate may include one or more acids.

[0111] The one or more acids may be one or more organic acids.

[0112] The one or more organic acids may be one or more carboxylic acids.

[0113] The one or more carboxylic acids may be lactic acid.

[0114] The one or more carboxylic acids may be levulinic acid.

[0115] The aerosol-forming substrate may have an acid content of 0.5 weight percent or more. The aerosol-forming substrate may have an acid content of 1 weight percent or more. The aerosol-forming substrate may have an acid content of 1.5 weight percent or more. The aerosol-forming substrate may have an acid content of 1.7 weight percent or more. The aerosol-forming substrate may have an acid content of 2 weight percent or more.

[0116] The aerosol-forming substrate may have an acid content of less than 5 percent by weight. The aerosol-forming substrate may have an acid content of less than 2.5 percent by weight. The aerosol-forming substrate may have an acid content of less than 2 percent by weight. The aerosol-forming substrate may have an acid content of less than 1.7 percent by weight. The aerosol-forming substrate may have an acid content of less than 1.5 percent by weight.

[0117] The aerosol-forming substrate may have an acid content of 0.5 weight percent to 5 weight percent. The aerosol-forming substrate may have an acid content of 0.5 weight percent to 2.5 weight percent. The aerosol-forming substrate may have an acid content of 1 weight percent to 2.5 weight percent. The aerosol-forming substrate may have an acid content of 1 weight percent to 2 weight percent. The aerosol-forming substrate may have an acid content of 1.5 weight percent to 2 weight percent.

[0118] The aerosol-forming substrate may have a lactic acid content of 0.5 weight percent or more. The aerosol-forming substrate may have a lactic acid content of 1 weight percent or more. The aerosol-forming substrate may have a lactic acid content of 1.5 weight percent or more. The aerosol-forming substrate may have a lactic acid content of 1.7 weight percent or more. The aerosol-forming substrate may have a lactic acid content of 2 weight percent or more.

[0119] The aerosol-forming substrate may have a lactic acid content of less than 5 percent by weight. The aerosol-forming substrate may have a lactic acid content of less than 2.5 percent by weight. The aerosol-forming substrate may have a lactic acid content of less than 2 percent by weight. The aerosol-forming substrate may have a lactic acid content of less than 1.7 percent by weight. The aerosol-forming substrate may have a lactic acid content of less than 1.5 percent by weight.

[0120] The aerosol-forming substrate may have a lactic acid content of 0.5 weight percent to 5 weight percent. The aerosol-forming substrate may have a lactic acid content of 0.5 weight percent to 2.5 weight percent. The aerosol-forming substrate may have a lactic acid content of 1 weight percent to 2.5 weight percent. The aerosol-forming substrate may have a lactic acid content of 1 weight percent to 2 weight percent. The aerosol-forming substrate may have a lactic acid content of 1.5 weight percent to 2 weight percent.

[0121] The aerosol-forming substrate may have a moisture content of 10 percent by weight or more. The aerosol-forming substrate may have a moisture content of 15 percent by weight or more. The aerosol-forming substrate may have a moisture content of 20 percent by weight or more. The aerosol-forming substrate may have a moisture content of 25 percent by weight or more.

[0122] The aerosol-forming substrate may have a moisture content of less than 30 percent by weight. The aerosol-forming substrate may have a moisture content of less than 25 percent by weight. The aerosol-forming substrate may have a moisture content of less than 20 percent by weight. The aerosol-forming substrate may have a moisture content of less than 15 percent by weight.

[0123] The aerosol-forming substrate may have a moisture content of 10 to 30 percent by weight. The aerosol-forming substrate may have a moisture content of 10 to 25 percent by weight. The aerosol-forming substrate may have a moisture content of 10 to 20 percent by weight. The aerosol-forming substrate may have a moisture content of 10 to 15 percent by weight.

[0124] The aerosol-forming substrate may have a moisture content of 15 to 30 percent by weight.The aerosol-forming substrate may have a moisture content of 20 to 30 percent by weight.The aerosol-forming substrate may have a moisture content of 25 to 30 percent by weight.

[0125] The aerosol-forming substrate may have a moisture content of 15 to 25 percent by weight.The aerosol-forming substrate may have a moisture content of 20 to 25 percent by weight.The aerosol-forming substrate may have a moisture content of 15 to 20 percent by weight.

[0126] The moisture content is measured according to the method defined in the following description.

[0127] The term "length" refers to the dimension of an aerosol-generating article or a component of an aerosol-generating article along its longitudinal axis.

[0128] The aerosol-generating article may have a length of less than 100 millimeters. The aerosol-generating article may have a length of less than 90 millimeters. The aerosol-generating article may have a length of less than 80 millimeters. The aerosol-generating article may have a length of less than 70 millimeters. The aerosol-generating article may have a length of less than 60 millimeters. The aerosol-generating article may have a length of less than 50 millimeters.

[0129] The aerosol-generating article may have a length of 30 millimeters or more. The aerosol-generating article may have a length of 35 millimeters or more. The aerosol-generating article may have a length of 38 millimeters or more. The aerosol-generating article may have a length of 40 millimeters or more. The aerosol-generating article may have a length of 42 millimeters or more. The aerosol-generating article may have a length of 45 millimeters or more.

[0130] The aerosol-generating article may have a length of from 38 millimetres to 70 millimetres.The aerosol-generating article may have a length of from 40 millimetres to 70 millimetres.The aerosol-generating article may have a length of from 42 millimetres to 70 millimetres.

[0131] The aerosol-generating article may have a length of from 38 millimetres to 60 millimetres.The aerosol-generating article may have a length of from 40 millimetres to 60 millimetres.

[0132] The aerosol-generating article may have a length of from 38 millimetres to 50 millimetres.The aerosol-generating article may have a length of from 42 millimetres to 50 millimetres.

[0133] The aerosol-generating article may have a length of 45 millimeters.

[0134] The aerosol-generating article may have an outer diameter of less than 15 millimeters. The aerosol-generating article may have an outer diameter of less than 12 millimeters. The aerosol-generating article may have an outer diameter of less than 10 millimeters. The aerosol-generating article may have an outer diameter of less than 8 millimeters.

[0135] The aerosol-generating article may have an outer diameter of 5 millimeters or more.The aerosol-generating article may have an outer diameter of 6 millimeters or more.The aerosol-generating article may have an outer diameter of 7 millimeters or more.

[0136] The aerosol-generating article may have an outer diameter of between 5 millimeters and 12 millimeters.The aerosol-generating article may have an outer diameter of between 6 millimeters and 12 millimeters.The aerosol-generating article may have an outer diameter of between 7 millimeters and 12 millimeters.

[0137] The aerosol-generating article may have an outer diameter of between 5 millimeters and 10 millimeters.The aerosol-generating article may have an outer diameter of between 6 millimeters and 10 millimeters.The aerosol-generating article may have an outer diameter of between 7 millimeters and 10 millimeters.

[0138] The aerosol-generating article may have an outer diameter of 5 millimeters to 8 millimeters.The aerosol-generating article may have an outer diameter of 6 millimeters to 8 millimeters.The aerosol-generating article may have an outer diameter of 7 millimeters to 8 millimeters.

[0139] The aerosol-generating article may comprise at least an outermost wrapper wrapped around the aerosol-forming substrate and the wrapper.

[0140] The outermost wrapper may be formed from paper.

[0141] The aerosol-generating article may comprise a susceptor element.The aerosol-generating article may comprise a plurality of susceptor elements.

[0142] The susceptor element may be an elongated susceptor element. The susceptor element may be rod-shaped. The susceptor element may be flat. The susceptor element preferably has a length of 12 mm. The susceptor element preferably has a width of 5 mm. The susceptor element preferably has a thickness of 60 μm.

[0143] The term "elongated," when used to describe a susceptor element, means that the susceptor element has a length dimension that is greater than its width dimension or its thickness dimension. For example, the length dimension may be greater than twice the width or thickness dimension.

[0144] The susceptor elements may be disposed substantially longitudinally within the aerosol-generating article, meaning that the length dimension of the susceptor elements is disposed approximately parallel to the longitudinal direction of the aerosol-generating article. For example, the susceptor elements may be disposed within ±10 degrees of parallel to the longitudinal direction of the aerosol-generating article. The susceptor elements may be positioned at a radially central location within the aerosol-generating article. The susceptor elements may extend along the longitudinal axis of the rod.

[0145] The susceptor element may be located within the aerosol-forming substrate. The susceptor element may extend over the entire length of the aerosol-forming substrate.

[0146] The susceptor element may be a plurality of susceptor particles that may be deposited on or embedded within the aerosol-forming substrate. The susceptor particles may be immobilized by the aerosol-forming substrate and remain at their initial position. The susceptor particles may be uniformly distributed in the aerosol-forming substrate. Due to the particle characteristics of the susceptor, heat may be generated according to the distribution of the particles in the aerosol-forming substrate. Alternatively, the susceptor element may be in the form of one or more sheets, strips, pieces or rods that may be placed next to or embedded within the aerosol-forming substrate. The aerosol-forming substrate may include one or more susceptor strips.

[0147] The term "thickness" as used herein refers to the distance through a susceptor from one exterior surface to another exterior surface. The susceptor element may have a thickness of 1 millimeter to 5 millimeters. The susceptor element may have a thickness of 0.01 millimeter to 2 millimeters. The susceptor element may have a thickness of 0.5 millimeter to 2 millimeters. The susceptor element may have a thickness of 10 micrometers to 500 micrometers. The susceptor element may have a thickness of 10 micrometers to 100 micrometers.

[0148] The susceptor may have a constant cross-section. The susceptor element may have a circular cross-section. If the susceptor element has a circular cross-section, the susceptor element may have a diameter of 1 millimeter to 5 millimeters. The diameter of a susceptor having a non-circular cross-section, such as a flat susceptor, may be comparable to the thickness of the flat susceptor.

[0149] The susceptor element may have a diameter of less than 5 millimeters. The susceptor element may have a diameter of less than 4 millimeters. The susceptor element may have a diameter of less than 3 millimeters. The susceptor element may have a diameter of less than 2 millimeters.

[0150] The susceptor element may have a diameter of 1 millimeter or greater. The susceptor element may have a diameter of 2 millimeters or greater. The susceptor element may have a diameter of 3 millimeters or greater. The susceptor element may have a diameter of 4 millimeters or greater.

[0151] For example, if the susceptor element has a circular cross-section, the width of the susceptor element may be the same as the diameter of the susceptor element.

[0152] The ratio of the thickness of the susceptor element to the thickness of the metal layer may be less than 3000. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be less than 2750. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be less than 2500. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be less than 2250. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be less than 2000. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be less than 1750. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be less than 1500. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be less than 1250. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be less than 1000.

[0153] The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1000 or more. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1250 or more. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1500 or more. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1750 or more. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 2000 or more. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 2250 or more. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 2500 or more. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 2750 or more. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 3000 or more. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1000 to 3000. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1250 to 3000. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1250 to 2750. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1500 to 2750. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1500 to 2500. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1750 to 2500. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1750 to 2250. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 2000 to 2250. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be 1750 to 2000.

[0154] The total exposed surface area of ​​the aerosol-forming substrate can be maximized by increasing the bulk density of the aerosol-forming substrate so that a larger amount of substrate, and therefore potentially a larger exposed surface area, can be provided per unit volume of a plug of the aerosol-forming substrate. The efficiency of delivery of the aerosol from a given volume of the aerosol-forming substrate can thereby be improved.

[0155] Mitigating migration of components away from the aerosol-forming substrate may be particularly important when the bulk density is high as the aerosol-forming substrate is contacted by the wrapper.

[0156] The bulk density of the aerosol-forming substrate may be 100 milligrams per cubic centimeter of the aerosol-forming substrate or more. The bulk density of the aerosol-forming substrate may be 200 milligrams per cubic centimeter of the aerosol-forming substrate or more. The bulk density of the aerosol-forming substrate may be 300 milligrams per cubic centimeter of the aerosol-forming substrate or more. The bulk density of the aerosol-forming substrate may be 400 milligrams per cubic centimeter of the aerosol-forming substrate or more. The bulk density of the aerosol-forming substrate may be 500 milligrams per cubic centimeter of the aerosol-forming substrate or more. The bulk density of the aerosol-forming substrate may be 600 milligrams per cubic centimeter of the aerosol-forming substrate or more. The bulk density of the aerosol-forming substrate may be 750 milligrams per cubic centimeter of the aerosol-forming substrate or more. The bulk density of the aerosol-forming substrate may be 850 milligrams per cubic centimeter of the aerosol-forming substrate or more. The bulk density of the aerosol-forming substrate may be greater than or equal to 1000 milligrams per cubic centimeter of the aerosol-forming substrate.

[0157] The bulk density of the aerosol-forming substrate may be less than 2000 milligrams per cubic centimeter of the aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 1750 milligrams per cubic centimeter of the aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 1500 milligrams per cubic centimeter of the aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 1250 milligrams per cubic centimeter of the aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 1000 milligrams per cubic centimeter of the aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 850 milligrams per cubic centimeter of the aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 750 milligrams per cubic centimeter of the aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 600 milligrams per cubic centimeter of the aerosol-forming substrate.

[0158] The bulk density of the aerosol-forming substrate may be between 100 milligrams per cubic centimeter of the aerosol-forming substrate and 2000 milligrams per cubic centimeter of the aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be between 200 milligrams per cubic centimeter of the aerosol-forming substrate and 1500 milligrams per cubic centimeter of the aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be between 300 milligrams per cubic centimeter of the aerosol-forming substrate and 1000 milligrams per cubic centimeter of the aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be between 400 milligrams per cubic centimeter of the aerosol-forming substrate and 600 milligrams per cubic centimeter of the aerosol-forming substrate.

[0159] The bulk density of an aerosol-forming substrate corresponds to the total weight of the aerosol-forming substrate (in mg), not including the weight of any carrier material, divided by the total volume of the aerosol-forming substrate (in cubic centimeters).

[0160] The aerosol generating system may comprise an aerosol generating device.

[0161] The aerosol generating device may include a housing defining a device cavity configured to receive at least a portion of the aerosol generating article.

[0162] The aerosol-generating device may comprise an atomizer configured to generate an aerosol from an aerosol-forming substrate.

[0163] The atomizer may be a thermal atomizer.

[0164] As used herein, the term "thermal atomizer" refers to an atomizer that is configured to heat an aerosol-forming substrate to generate an aerosol.

[0165] The aerosol-generating device may comprise any suitable type of thermal atomizer. For example, the thermal atomizer may include a heater. The thermal atomizer may comprise an electric heater. In one embodiment, the thermal atomizer may comprise an electric heater comprising a heating element. The heating element may be a resistive heating element. In one embodiment, the heating element may comprise a heater blade or pin adapted to be inserted into the aerosol-forming substrate such that the aerosol-forming substrate is heated from its interior. In another embodiment, the heating element may partially or completely surround the aerosol-forming substrate and heat the aerosol-forming substrate circumferentially from its exterior.

[0166] In another embodiment, the thermal atomizer may comprise an induction heating device. The induction heating device typically comprises an induction source configured to be coupled to the susceptor element, which may be located external to the aerosol-forming substrate or internal to the aerosol-forming substrate. The induction source generates an alternating electromagnetic field that induces magnetization or eddy currents in the susceptor element. The susceptor element may be heated as a result of hysteresis losses or induced eddy currents, which heat the susceptor element by ohmic or resistive heating.

[0167] The aerosol-generating device may further comprise a susceptor. The susceptor elements may be as described above in relation to the aerosol-generating article.

[0168] An aerosol-generating apparatus equipped with an induction heating device may be configured to receive an aerosol-generating article having an aerosol-forming substrate and a susceptor element in thermal proximity to the aerosol-forming substrate. Typically, the susceptor element is in direct contact with the aerosol-forming substrate and heat is transferred from the susceptor element to the aerosol-forming substrate primarily by conduction.

[0169] Examples of electrically operated aerosol generating systems having induction heating devices and aerosol generating articles having susceptor elements are described in WO-A1-95 / 27411 and WO-A1-2015 / 177255.

[0170] The aerosol generating device may include a battery and control electronics.

[0171] It is understood that any feature described herein in relation to one embodiment of an aerosol-forming substrate, an aerosol-generating article, an aerosol generating device, or an aerosol generating system may also be applied to other embodiments of an aerosol-forming substrate, an aerosol-generating article, an aerosol generating device, or an aerosol generating system according to the present disclosure. A feature described in relation to one embodiment may be equally applied to another embodiment according to the present disclosure. It is also understood that an aerosol generator according to the present disclosure may be installed in an aerosol generating device that does not have a cartridge. Thus, any feature described herein in relation to a cartridge may be equally applied to an aerosol generating device.

[0172] The present invention is defined in the claims. However, below is provided a non-exhaustive list of non-limiting examples. Any one or more of the features of these examples may be combined with any one or more features of any other example, embodiment, or aspect described herein. EXAMPLES

[0173] Example 1. 1. An aerosol-generating article comprising: an aerosol-forming substrate comprising one or more aerosol formers; A wrapper and The wrapper is wrapped around the aerosol-forming substrate; The wrapper includes a metal layer; An aerosol-generating article, wherein the aerosol-forming substrate has an aerosol former content of 40 weight percent or more. Example 2. 2. The aerosol-generating article of example 1, wherein the wrapper comprises a paper layer. Example 3. 3. The aerosol-generating article of example 2, wherein the metal layer is radially inward of the paper layer. Example 4. 4. The aerosol-generating article of example 2 or 3, wherein the wrapper comprises a metal layer deposited on a paper layer. Example 5. 4. The aerosol-generating article of example 2 or 3, wherein the wrapper comprises a laminate of a metal layer secured to a paper layer. Example 6. 6. An aerosol-generating article according to any one of Examples 2 to 5, wherein the metal layer has a thickness of 2 nanometers or more. Example 6. 7. An aerosol-generating article according to any one of Examples 2 to 6, wherein the metal layer has a thickness of less than 100 nanometers. Example 7. 7. An aerosol-generating article according to any one of Examples 2 to 6, wherein the metal layer has a thickness of from 10 nanometers to 60 nanometers. Example 8. 8. An aerosol-generating article according to any one of Examples 1 to 7, wherein the metal layer comprises aluminum. Example 9. 9. An aerosol-generating article according to any one of Examples 2 to 8, wherein the paper layer has a thickness of 10 micrometers or more. Example 10. 10. An aerosol-generating article according to any one of Examples 2 to 9, wherein the paper layer has a thickness of less than 120 micrometers. Example 11. 11. The aerosol-generating article according to any one of Examples 2 to 10, wherein the paper layer has a thickness of 40 micrometers to 80 micrometers. Example 12. An aerosol-generating article according to any one of Examples 1 to 11, wherein the wrapper is wrapped around the entire length of the aerosol-forming substrate. Example 13. An aerosol-generating article according to any one of Examples 1 to 12, comprising an upstream element located upstream of the aerosol-forming substrate. Example 14. The aerosol-generating article of example 13, wherein the upstream element comprises an annular plug. Example 15. 15. The aerosol-generating article of example 13 or 14, wherein the wrapper is wrapped around at least a portion of the upstream element. Example 16. 16. The aerosol-generating article of example 15, wherein the wrapper covers the entire length of the upstream element. Example 17. An aerosol-generating article according to any one of Examples 1 to 16, comprising a hollow tubular segment downstream of the aerosol-forming substrate. Example 18. The aerosol-generating article of example 17, wherein the hollow tubular segment is a cellulose acetate tube. Example 19. 19. The aerosol-generating article of example 17 or 18, wherein the wrapper is wrapped around at least a portion of the hollow tubular segment. Example 20. 20. The aerosol-generating article of any one of Examples 1 to 19, wherein the aerosol-forming substrate has an aerosol-forming substance content of 50 weight percent or more. Example 21. 21. The aerosol-generating article of any one of Examples 1 to 20, wherein the aerosol-forming substrate has an aerosol-forming substance content of 60 weight percent or more. Example 21. 22. The aerosol-generating article of any one of Examples 1-21, wherein the aerosol-forming substrate has an aerosol former content of less than 90 weight percent. Example 22. 23. The aerosol-generating article of any one of Examples 1-22, wherein the aerosol-forming substrate has an aerosol former content of less than 80 weight percent. Example 23. 23. The aerosol-generating article of any one of Examples 1 to 22, wherein the aerosol-forming substrate has an aerosol-forming substance content of 40 weight percent to 90 weight percent. Example 24. 24. The aerosol-generating article of any one of Examples 1 to 23, wherein the aerosol-forming substrate has an aerosol-forming material content of 50 weight percent to 80 weight percent. Example 25. 25. The aerosol-generating article of any one of Examples 1 to 24, wherein the aerosol-forming substrate has an aerosol-forming substance content of 100 milligrams or more. Example 26. 26. The aerosol-generating article of any one of Examples 1 to 25, wherein the aerosol-forming substrate has an aerosol-forming substance content of 200 milligrams or more. Example 27. 27. The aerosol-generating article of any one of Examples 1 to 26, wherein the aerosol-forming substrate has an aerosol former content of less than 400 milligrams. Example 28. 28. The aerosol-generating article of any one of Examples 1 to 27, wherein the aerosol-forming substrate has an aerosol former content of less than 300 milligrams. Example 29. The aerosol-generating article of any one of Examples 1 to 28, wherein the aerosol-forming substrate has an aerosol-forming substance content of 100 milligrams to 400 milligrams. Example 30. 30. The aerosol-generating article of any one of Examples 1 to 29, wherein the aerosol-forming substrate has an aerosol-forming substance content of 200 milligrams to 300 milligrams. Example 31. 31. The aerosol-generating article of any one of Examples 1 to 30, wherein the aerosol-forming substrate has an aerosol former content of 0.05 grams per cubic centimeter or more. Example 32. 32. The aerosol-generating article of any one of Examples 1 to 31, wherein the aerosol-forming substrate has an aerosol-forming substance content of 0.1 grams per cubic centimeter or more. Example 33. 33. The aerosol-generating article of any one of Examples 1 to 32, wherein the aerosol-forming substrate has an aerosol former content of less than 0.3 grams per cubic centimeter. Example 34. 34. The aerosol-generating article of any one of Examples 1 to 33, wherein the aerosol-forming substrate has an aerosol former content of less than 0.25 grams per cubic centimeter. Example 35. 35. The aerosol-generating article of any one of Examples 1 to 34, wherein the aerosol-forming substrate has an aerosol former content of from 0.05 grams per cubic centimeter to 0.3 grams per cubic centimeter. Example 36. 36. The aerosol-generating article of any one of Examples 1 to 35, wherein the aerosol-forming substrate has an aerosol former content of from 0.1 grams per cubic centimeter to 0.25 grams per cubic centimeter. Example 37. 37. The aerosol-generating article of any one of Examples 1-36, wherein the one or more aerosol formers include one or more of glycerin and propylene glycol. Example 38. 38. An aerosol-generating article according to any one of Examples 1 to 37, wherein the aerosol-forming substrate has a moisture content of 10 percent by weight or more, measured according to the method defined in the specification. Example 39. An aerosol-generating article according to any one of Examples 1 to 38, wherein the aerosol-forming substrate has a moisture content of 15 weight percent or more, measured according to the method defined herein. Example 40. 40. An aerosol-generating article according to any one of Examples 1 to 39, wherein the aerosol-forming substrate has a moisture content of less than 30 percent by weight, measured according to the method defined herein. Example 41. 41. An aerosol-generating article according to any one of Examples 1 to 40, wherein the aerosol-forming substrate has a moisture content of less than 25 percent by weight, measured according to the method defined herein. Example 42. 42. An aerosol-generating article according to any one of Examples 1 to 41, wherein the aerosol-forming substrate has a moisture content, measured according to the method defined in the specification, of between 10 percent and 30 percent by weight. Example 43. 43. An aerosol-generating article according to any one of Examples 1 to 42, wherein the aerosol-forming substrate has a moisture content, measured according to the method defined in the specification, of between 15 percent by weight and 25 percent by weight. Example 44. An aerosol-generating article according to any one of Examples 1 to 43, wherein the aerosol-generating article has a length of less than 100 millimeters. Example 45. An aerosol-generating article according to any one of Examples 1 to 44, wherein the aerosol-generating article has a length of less than 80 millimeters. Example 46. The aerosol-generating article according to any one of Examples 1 to 45, wherein the aerosol-generating article has a length of 38 mm to 70 mm. Example 47. The aerosol-generating article according to any one of Examples 1 to 46, wherein the aerosol-generating article has a length of 42 mm to 50 mm. Example 48. An aerosol-generating article according to any one of Examples 1 to 47, comprising at least an outermost wrapper wrapped around the aerosol-forming substrate and the wrapper. Example 49. An aerosol-generating article according to any one of Examples 1 to 48, comprising a susceptor element. Example 50. 50. The aerosol-generating article of example 49, wherein the susceptor element extends the entire length of the aerosol-forming substrate. Example 51. 51. The aerosol-generating article of example 49 or 50, wherein the susceptor element is rod-shaped. Example 52. 52. The aerosol-generating article of any one of Examples 49-51, wherein the susceptor element has a diameter of less than 5 millimeters. Example 53. 53. The aerosol-generating article of any one of Examples 49-52, wherein the susceptor element has a diameter of less than 4 millimeters. Example 54. An aerosol-generating article according to any one of Examples 49 to 53, wherein the susceptor element has a diameter of 1 millimeter or more. Example 55. An aerosol-generating article according to any one of Examples 49 to 54, wherein the susceptor element has a diameter of 2 millimeters or more. Example 56. An aerosol-generating article according to any one of Examples 49 to 55, wherein the susceptor element has a diameter of 1 millimeter to 5 millimeters. Example 57. An aerosol-generating article according to any one of Examples 49 to 56, wherein the susceptor element has a diameter of between 2 millimeters and 4 millimeters. Example 58. An aerosol-generating article according to any one of Examples 49 to 57, wherein the ratio of the thickness of the susceptor element to the thickness of the metal layer is less than 2500. Example 59. 59. The aerosol-generating article of any one of Examples 49-58, wherein the ratio of the thickness of the susceptor element to the thickness of the metal layer is 1500 or greater. Example 60. 60. The aerosol-generating article of any one of Examples 49 to 59, wherein the ratio of the thickness of the susceptor element to the thickness of the metal layer is 1500 to 2500. Example 61. 61. The aerosol-generating article of any one of Examples 49 to 60, wherein the aerosol-forming substrate has a bulk density of 100 milligrams per cubic centimeter or greater. Example 62. 62. The aerosol-generating article of any one of Examples 49 to 61, wherein the aerosol-forming substrate has a bulk density of less than 2000 milligrams per cubic centimeter. Example 63. 63. The aerosol-generating article of any one of Examples 49 to 62, wherein the bulk density of the aerosol-forming substrate is between 100 milligrams per cubic centimeter and 2000 milligrams per cubic centimeter. Example 64. An aerosol-generating article according to any one of Examples 1 to 63, comprising a mouthpiece element. Example 65. The aerosol-generating article of Example 64, wherein the wrapper is wrapped around at least a portion of the mouthpiece element. Example 66. 66. The aerosol-generating article of any one of Examples 1-65, comprising a second hollow tubular segment, the second hollow tubular segment being downstream of the aerosol-forming substrate. Example 67. 67. The aerosol-generating article of Example 66, wherein the second hollow tubular segment is a cardboard tube. Example 68. 68. The aerosol-generating article of Example 66 or 67, wherein the wrapper is wrapped around at least a portion of the second hollow tubular segment.

[0174] The invention will now be further described with reference to the figures shown in the accompanying drawings. [Brief description of the drawings]

[0175] [Figure 1] FIG. 1 shows a schematic cross-sectional side view of an aerosol-generating article according to the present invention. [Diagram 2] FIG. 2 shows a schematic cross-sectional side view of another aerosol-generating article according to the present invention. [Diagram 3] FIG. 3 shows a schematic cross-sectional side view of another aerosol-generating article according to the present invention. [Figure 4] FIG. 4 shows a schematic cross-sectional side view of another aerosol-generating article according to the present invention. [Diagram 5] FIG. 5 shows a schematic cross-sectional side view of another aerosol-generating article according to the present invention. [Figure 6]FIG. 6 shows a schematic cross-sectional side view of another aerosol-generating article according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0176] An aerosol generating system for delivering an aerosol to a user typically comprises an aerosol generating article and an atomizer. The aerosol generating article comprises an aerosol-forming substrate. The atomizer is configured to generate an inhalable aerosol from the aerosol-forming substrate. Some known aerosol generating systems comprise a thermal atomizer, such as an electric heater or an induction heating device. The thermal atomizer is configured to heat and vaporize the aerosol-forming substrate to generate an aerosol that can be inhaled by the user. A typical aerosol-forming substrate for use in an aerosol generating system is a nicotine formulation, which may be a liquid nicotine formulation that includes an aerosol former such as glycerin.

[0177] The aerosol-forming substrate is typically held within a plug of porous material. In some cases, it has been found that a certain amount of one or more components of the aerosol-forming substrate, such as glycerin or nicotine, can escape the plug and migrate to other parts of the aerosol-generating article. The migration of the aerosol-forming substrate away from the plug can reduce the amount of the aerosol-forming substrate that can be vaporized and subsequently inhaled by the user.

[0178] Thus, if components of the aerosol-forming substrate migrate away from the plug, the user experience provided by the aerosol-generating article may be adversely affected, for example, if nicotine migrates from the aerosol-forming substrate, the amount of nicotine that can be inhaled by the user may be reduced.

[0179] Migration of components of the aerosol-forming substrate away from the plug has been found to be particularly problematic for aerosol-forming substrates having a significant amount of aerosol former, such as an aerosol former content of more than 40 weight percent, which may be because increasing the proportion of glycerin in the aerosol-forming substrate provides a more leaky fluid aerosol-forming substrate.

[0180] One known solution is to wrap the aerosol-generating article in hydrophobic paper. However, the inventors have found that when using hydrophobic paper, some of the aerosol formers in the aerosol-forming substrate may migrate into the paper during the process of manufacturing the aerosol-generating article. This may dampen or soften the hydrophobic paper, which may make the aerosol-generating article difficult to handle, or may cause the aerosol generation to clog in the machine used to manufacture the aerosol-generating article.

[0181] It would be desirable to provide an aerosol-generating article in which the likelihood of components of the aerosol-forming substrate migrating from the aerosol-forming substrate to another part of the aerosol-generating article is reduced.

[0182] FIG. 1 illustrates an embodiment of an aerosol-generating article 10 .

[0183] The aerosol-generating article 100 includes a rod of aerosol-forming substrate 12. In this embodiment, the rod of aerosol-forming substrate 12 is formed by crimping a portion of a sheet of cast leaf tobacco.

[0184] The aerosol-generating article 100 also includes a downstream section 14 and an upstream section 16. The downstream section 14 is located downstream of the rod of aerosol-forming substrate 12. The upstream section 16 is located upstream of the rod of aerosol-forming substrate 12. In this embodiment, the aerosol-generating article 100 extends from an upstream end (or distal end) 18 to a downstream end (or oral end) 20.

[0185] In the embodiment shown in FIG. 1, the aerosol-generating article 100 has a total length of about 45 millimeters.

[0186] The downstream section 14 includes a support element 22 located immediately downstream from the rod of aerosol-forming substrate 12. The support element 22 is longitudinally aligned with the rod of aerosol-forming substrate 12.

[0187] In the embodiment shown in FIG. 1, the upstream end of the support element 22 abuts the downstream end of the rod 12 of the aerosol-forming substrate.

[0188] The downstream section 14 includes an aerosol cooling element 24. The aerosol cooling element 24 is located immediately downstream of the support element 22. The aerosol cooling element 24 is longitudinally aligned with the aerosol-forming substrate rod 12 and the support element 22. In the embodiment shown in Figure 1, the upstream end of the aerosol cooling element 24 abuts the downstream end of the support element 22.

[0189] The support element 22 and the aerosol cooling element 24 together define an intermediate hollow section 50 of the aerosol-generating article 10 .

[0190] The support element 22 includes a first hollow tubular segment 26. In the embodiment of Figure 1, the first hollow tubular segment 26 is provided in the form of a hollow cylindrical tube made of cellulose acetate. The first hollow tubular segment 26 defines an interior cavity 28 that extends from an upstream end 30 of the first hollow tubular segment 26 all the way to a downstream end 32 of the first hollow tubular segment 26. The interior cavity 28 is substantially empty, thereby permitting substantially unrestricted air flow therealong.

[0191] 1, the first hollow tubular segment 26 has a length of about 8 millimeters, an outer diameter of about 7.25 millimeters, and an inner diameter of about 1.9 millimeters. Thus, the peripheral wall thickness of the first hollow tubular segment 26 is about 2.67 millimeters.

[0192] The aerosol cooling element 24 includes a second hollow tubular segment 34. In the embodiment of FIG. 1, the second hollow tubular segment 34 is provided in the form of a hollow cylindrical tube made of cellulose acetate. The second hollow tubular segment 34 defines an interior cavity 36 that extends from an upstream end 38 of the second hollow tubular segment all the way to a downstream end 40 of the second hollow tubular segment 34. The interior cavity 36 is substantially empty, thereby permitting substantially unrestricted airflow therealong.

[0193] 1, the second hollow tubular segment 34 has a length of about 8 millimeters, an outer diameter of about 7.25 millimeters, and an inner diameter of about 3.25 millimeters. Thus, the peripheral wall thickness of the second hollow tubular segment 34 is about 2 millimeters. Thus, the ratio between the inner diameter of the first hollow tubular segment 26 and the inner diameter of the second hollow tubular segment 34 is about 0.75.

[0194] The aerosol-generating article 100 has a ventilation zone 60 located at a position along the second hollow tubular segment 34. In the embodiment of Figure 1, the ventilation zone 60 is located about 2 millimeters from the upstream end of the second hollow tubular segment 34. The ventilation level of the aerosol-generating article 100 is about 25 percent.

[0195] The downstream section 14 includes a mouthpiece element 42 located downstream of the intermediate hollow section 50. The mouthpiece element 42 is positioned immediately downstream of the aerosol cooling element 24. As shown in the drawing in FIG. 1, the upstream end of the mouthpiece element 42 abuts the downstream end 40 of the aerosol cooling element 18.

[0196] 1, mouthpiece element 42 is provided in the form of a cylindrical plug of low density cellulose acetate. Mouthpiece element 42 has a length of about 12 millimeters and an outer diameter of about 7.25 millimeters.

[0197] In the embodiment of FIG. 1, the rod 12 of aerosol-forming substrate has a diameter of about 7.25 millimeters and a length of about 12 millimeters.

[0198] The aerosol-generating article 100 includes an elongated susceptor element 44 within the rod of aerosol-forming substrate 12. The susceptor element 44 is disposed substantially longitudinally within the aerosol-generating substrate such that the susceptor element 44 is substantially parallel to the longitudinal direction of the rod of aerosol-forming substrate 12. The susceptor element 44 is positioned at a radially central location within the rod 12 and effectively extends along the longitudinal axis of the rod 12.

[0199] The susceptor element 44 extends all the way from the upstream end to the downstream end of the aerosol-forming substrate rod 12. In fact, the susceptor element 44 has substantially the same length as the aerosol-forming substrate rod 12.

[0200] In the embodiment of FIG. 1, the susceptor elements 44 are provided in the form of strips having a length of about 12 millimeters, a thickness of about 60 micrometers, and a width of about 4 millimeters.

[0201] The upstream section 16 includes an upstream element 46. The upstream element 46 is located immediately upstream of the aerosol-forming substrate rod 12. The upstream element 46 is in longitudinal alignment with the rod 12.

[0202] The downstream end of the upstream element 46 abuts the upstream end of the aerosol-forming substrate rod 12. This advantageously prevents dislodgment of the susceptor element 44. Furthermore, this ensures that a user cannot accidentally come into contact with the heated susceptor element 44 after use.

[0203] 1, the upstream element 46 is provided in the form of a cylindrical plug of cellulose acetate. The upstream element 46 has a length of about 5 millimeters.

[0204] The aerosol-generating article 100 includes a wrapper 70. The wrapper 70 is wrapped around the rod 12 of aerosol-forming substrate. The wrapper 70 includes a metal layer. In the embodiment of FIG. 1, the metal is aluminum. In the embodiment of FIG. 1, the wrapper 70 also includes a paper layer. In one embodiment, the metal layer is deposited on the paper layer. For example, the metal layer can be deposited on the paper layer using a vapor deposition process. In another embodiment, the metal layer is secured to the paper layer. For example, the metal layer and the paper layer can be bonded together to form a laminate.

[0205] In the embodiment of FIG. 1, the metal layer has a thickness of 40 nanometers and the paper layer has a thickness of 60 micrometers.

[0206] In some embodiments, the wrapper 70 is wrapped around the entire circumferential surface area of ​​the rod 12 of the aerosol-forming substrate.

[0207] The wrapper 70 is provided to act as a physical barrier between the rod 12 of aerosol-forming substrate and the other components of the aerosol-generating article 10 .

[0208] The aerosol-generating article 100 includes an outermost wrapper 80. In the embodiment of Figure 1, the outermost wrapper 80 is wrapped around all of the components of the aerosol-generating article 10. The outermost wrapper 80 is also a wrapper around the wrapper 70.

[0209] Figures 2, 3, 4, 5 and 6 show alternative embodiments to that shown in Figure 1. Aerosol-generating article 200 of Figure 2, aerosol-generating article 300 of Figure 3, aerosol-generating article 400 of Figure 4, aerosol-generating article 500 of Figure 5 and aerosol-generating article 600 of Figure 6 are identical to aerosol-generating article 100 of Figure 1, with the following differences.

[0210] In the embodiment shown in Figure 2, the wrapper 70 is wrapped around both the rod of aerosol-forming substrate 12 and the upstream element 46. In contrast, in the embodiment shown in Figure 1, the wrapper 70 is wrapped only around the rod of aerosol-forming substrate 12.

[0211] 2, the wrapper 70 is wrapped around the entire length of the upstream element 46. However, in some embodiments, the wrapper 70 may be wrapped around only a portion of the length of the upstream element 46.

[0212] In the embodiment of FIG. 2, the upstream element 46 is pre-wrapped with a paper element wrapper (not shown) that is positioned underneath the wrapper 70 .

[0213] In the embodiment shown in Figure 3, the wrapper 70 is wrapped around both the rod of aerosol-forming substrate 12 and the first hollow tubular segment 26. In contrast, in the embodiment shown in Figure 1, the wrapper 70 is wrapped only around the rod of aerosol-forming substrate 12.

[0214] 3, the wrapper 70 is wrapped around the entire length of the first hollow tubular segment 26. However, in some embodiments, the wrapper 70 may be wrapped around only a portion of the length of the first hollow tubular segment 26.

[0215] In the embodiment shown in Figure 4, the wrapper 70 is wrapped around the upstream element 46, the rod of aerosol-forming substrate 12, and the entire length of the first hollow tubular segment 26. In contrast, in the embodiment shown in Figure 1, the wrapper 70 is wrapped only around the rod of aerosol-forming substrate 12.

[0216] 4, the wrapper 70 is wrapped around the entire length of the first hollow tubular segment 26. However, in some embodiments, the wrapper 70 may be wrapped around only a portion of the length of the first hollow tubular segment 26.

[0217] In the embodiment shown in Figure 5, the wrapper 70 is wrapped around the entire length of the upstream element 46, the rod of aerosol-forming substrate 12, the first hollow tubular segment 26 and the second hollow tubular segment 34. In contrast, in the embodiment shown in Figure 1, the wrapper 70 is wrapped only around the rod of aerosol-forming substrate 12.

[0218] 5, the wrapper 70 is wrapped around the entire length of the first hollow tubular segment 26 and the entire length of the second hollow tubular segment 34. However, in some embodiments, the wrapper 70 may be wrapped around only a portion of the length of the first hollow tubular segment 26 and / or a portion of the length of the second hollow tubular segment 34.

[0219] In the embodiment shown in Figure 6, the wrapper 70 is wrapped around the entire length of all elements of the aerosol-generating article 600. In other words, in the embodiment of Figure 6, the wrapper 70 is wrapped around the upstream element 46, the rod of aerosol-forming substrate 12, the first hollow tubular segment 26, the second hollow tubular segment 34, and the mouthpiece element 42. In contrast, in the embodiment shown in Figure 1, the wrapper 70 is wrapped only around the rod of aerosol-forming substrate 12.

[0220] In the examples of Figures 1, 2, 3, 4, 5, and 6, the rod 12 is a porous medium loaded with a quantity of an aerosol-forming substrate. Exemplary formulations of suitable aerosol-forming substrates are shown in Table 1. [Table 1]

[0221] The moisture content of Example A is 20 percent by weight. In this example, the moisture content includes the total glycerin content and water content of the formulation.

[0222] The moisture content of the aerosol-forming substrate is measured according to the following method. 1. Condition the aerosol-forming substrate at a temperature of 22° C., a humidity of 50% relative humidity, and a pressure of 100 kPa using a forced air flow; 2. Stopping the adjustment when the weight of the aerosol-forming substrate no longer changes by more than 0.2% of the total weight over a period of three hours; 3. The Karl Fischer titration method is carried out on the aerosol-forming substrate; a. extracting water by shaking the aerosol-forming substrate with dry methanol; b. Injecting an aliquot portion of the aerosol-forming substrate into a titration vessel; c. titrating an aliquot portion of the aerosol-forming substrate with Karl Fischer's reagent without pyridine; and d. Calculate the moisture content using the following formula:

number

[0223] From this method, the moisture content in weight percent of the aerosol-forming substrate can be obtained. [Table 2]

[0224] Providing a wrapper 70 that is wrapped around the rod 12 of the aerosol-forming substrate and includes a metal layer may help contain one or more of the components of the aerosol-forming substrate within the rod 12. In other words, the wrapper 70 may help reduce migration of one or more components of the aerosol-forming substrate away from the rod 12 and to other portions of the aerosol-generating article 100.

[0225] Table 2 shows the nicotine yield from the rod 12 of the aerosol-forming substrate of Example A in the aerosol-generating articles of Examples 1 and 2.

[0226] The aerosol-generating article of Example 1 is a typical aerosol-generating article that does not include a wrapper having a metal layer wrapped around an aerosol-forming substrate. Instead, the wrapper in the aerosol-generating article of Example 1 is a simple paper wrapper. The aerosol-generating article of Example 2 is an aerosol-generating article 100, as described above and shown in FIG.

[0227] As shown in Table 2, when the aerosol-generating article 100 does not include a wrapper 70, the nicotine yield from the plug of aerosol-forming substrate 12 is 278 micrograms. However, when the aerosol-generating article 100 includes a wrapper 70, the nicotine yield from the rod of aerosol-forming substrate 12 increases by 66% to 461 micrograms.

[0228] Thus, by providing a wrapper 70 wrapped around the aerosol-forming substrate rod 12 and including a metal layer, the nicotine yield from the aerosol-forming substrate rod 12 is increased.

[0229] The nicotine yield is increased because the metal layer of the wrapper may prevent or at least reduce the migration of components of the aerosol-forming substrate, such as the aerosol former, out of the rod 12 and to other parts of the aerosol-generating article 100. Thus, if more aerosol-forming substrate is retained within the rod 12, more nicotine can be obtained from the aerosol-forming substrate.

[0230] Increasing the nicotine yield from the aerosol-forming substrate rod 12 may result in an improved user experience.

[0231] The specific examples described above are illustrative of the invention but are not limiting, and it is understood that other embodiments of the invention may be practiced and that the specific examples described herein are not exhaustive.

Claims

1. An aerosol-generating article, comprising: an aerosol-forming substrate comprising one or more aerosol-forming substances; and a wrapper, wherein the wrapper is wrapped around the aerosol-forming substrate, the wrapper comprises a metal layer, the aerosol-forming substrate has an aerosol-forming substance content of 40 wt% or more, the metal layer has a thickness of 2 nm or more, and the metal layer has a thickness of 2000 nm or less.

2. The aerosol-generating article according to claim 1, wherein the wrapper comprises a paper layer.

3. The aerosol-generating article according to claim 2, wherein the metal layer is radially inside the paper layer.

4. The aerosol-generating article according to claim 2, wherein the wrapper comprises the metal layer deposited on the paper layer.

5. The aerosol-generating article according to claim 1, wherein the wrapper is wrapped around the entire length of the aerosol-forming substrate.

6. The aerosol-generating article according to claim 1, wherein the aerosol-forming substrate has an aerosol-forming substance content of 50 wt% or more.

7. The aerosol-generating article according to claim 1, wherein the aerosol-forming substrate has an aerosol-forming substance content of 60 wt% or more.

8. The aerosol-generating article according to claim 1, wherein the aerosol-forming substrate has an aerosol-forming substance content of 40 wt% to 90 wt%.

9. The aerosol-generating article according to claim 1, wherein the aerosol-forming substrate has an aerosol-forming substance content of 50 wt% to 80 wt%.

10. The aerosol-generating article according to claim 1, wherein the aerosol-forming substrate has an aerosol-forming substance content of 100 mg or more.

11. The aerosol-generating article according to claim 1, wherein the one or more aerosol-forming substances comprise one or more of glycerin and propylene glycol.

12. The aerosol-generating article according to claim 1, wherein the aerosol-forming substrate has a moisture content of 10 wt% or more, measured according to the method defined in the specification.

13. The aerosol-generating article according to claim 1, further comprising an outermost wrapper wrapped around at least the aerosol-forming substrate and the wrapper.

14. The aerosol-generating article according to claim 1, comprising a susceptor element.

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