Aerosol-generating article comprising a wrapper having a susceptor element and a metal layer - Patents.com

Abstract

The aerosol-generating article (100) comprises a rod (12) of aerosol-forming substrate. The rod (12) comprises a susceptor element (44) within the aerosol-forming substrate. The aerosol-generating article (100) comprises a wrapper (70) wrapped around the rod (12) of aerosol-forming substrate. The wrapper (70) comprises a metal layer. The metal layer has a thickness of less than 100 nanometers.

Description

[Technical field]

[0001] The present invention relates to an aerosol-generating article that includes a wrapper having a susceptor element and a metal layer. [Background technology]

[0002] Aerosol generating systems for delivering aerosols to users typically include an aerosol generating article and an atomizer. The aerosol generating article includes a rod of an aerosol-forming substrate. The atomizer is configured to generate an inhalable aerosol from the aerosol-forming substrate. Some known aerosol generating systems include 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 aerosol generating systems is a nicotine formulation, which may include an aerosol former, such as glycerin. Summary of the Invention [Problem to be solved by the invention]

[0003] It would be desirable to provide an aerosol-generating article that includes a susceptor element and provides improved nicotine delivery. [Brief description of the drawings]

[0004] [Figure 1] 1 shows a schematic cross-sectional side view of an aerosol-generating article according to the present invention. [Diagram 2] 2 shows a schematic cross-sectional side view of another aerosol-generating article according to the present invention. [Diagram 3] 2 shows a schematic cross-sectional side view of another aerosol-generating article according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0005] An aerosol-generating article is provided. The aerosol-generating article may comprise a rod of an aerosol-forming substrate. The rod may comprise a susceptor element. The susceptor element may be disposed within the aerosol-forming substrate. The aerosol-generating article may comprise a wrapper. The wrapper may be wrapped around the rod of solid aerosol-forming substrate. The wrapper may comprise a metal layer. The metal layer may have a thickness of 100 nanometers or less.

[0006] Also provided is an aerosol-generating article comprising a rod of an aerosol-forming substrate, the rod comprising a susceptor element within the aerosol-forming substrate, and a wrapper wrapped around the rod of the aerosol-forming substrate, the wrapper comprising a metal layer, the metal layer having a thickness of 100 nanometers or less.

[0007] Also provided is an aerosol generating system. The aerosol generating system may comprise an aerosol generating article. The aerosol generating article may comprise a rod of an aerosol-forming substrate. The rod may comprise a susceptor element. The susceptor element may be disposed within the aerosol-forming substrate. The aerosol generating article may comprise a wrapper. The wrapper may be wrapped around the rod of solid aerosol-forming substrate. The wrapper may comprise a metal layer. The metal layer may have a thickness of 100 nanometers or less. The aerosol generating system may comprise an aerosol generating device. The aerosol generating device may comprise an atomizer. The aerosol generating device may comprise a power source. The aerosol generating device may comprise a controller. The controller may be programmed to control power provided from the power source to the atomizer.

[0008] Also provided is an aerosol generating system comprising an aerosol generating article and an aerosol generating device, the aerosol generating article comprising a rod of an aerosol-forming substrate comprising a susceptor element within the aerosol-forming substrate, and a wrapper wrapped around the rod of the aerosol-forming substrate, the wrapper comprising a metal layer, the metal layer having a thickness of 100 nanometers or less, and the aerosol generating device comprising an atomizer, a power source, and a controller, the controller being programmed to control power supplied from the power source to the atomizer.

[0009] By providing a wrapper wrapped around the rod of aerosol-forming substrate and comprising a thin metal layer, better nicotine delivery from the aerosol-forming substrate to the user may be provided.

[0010] Additionally, the thinness of the metal layer may result in reduced interaction between the metal layer and the magnetic field generated to heat the susceptor elements, which may allow for more consistent and more efficient heating of the susceptor elements while also providing better nicotine delivery as discussed above.

[0011] The inventors believe that the metal layer may form a barrier between the surface of the rod 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.

[0012] 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.

[0013] Furthermore, using a thin metal layer may reduce the amount of metal required to form the metal layer, which may improve sustainability and reduce waste.

[0014] 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 burning the aerosol-forming substrate. Known heated aerosol-generating articles include, for example, electrically heated aerosol-generating articles.

[0015] The term "aerosol-forming substrate" as used herein refers to a substrate that can generate, upon heating, a volatile compound capable of forming an aerosol. The aerosol generated from the aerosol-forming substrate can be visible or invisible to the human eye and can 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] The metal layer may have a thickness of less than 5000 nanometers. The metal layer may have a thickness of less than 4000 nanometers. The metal layer may have a thickness of less than 3000 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 400 nanometers. The metal layer may have a thickness of less than 300 nanometers. The metal layer may have a thickness of less than 250 nanometers. The metal layer may have a thickness of less than 200 nanometers. The metal layer may have a thickness of less than 150 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. The metal layer may have a thickness of less than 45 nanometers. The metal layer may have a thickness of less than 40 nanometers. The metal layer may have a thickness of less than 35 nanometers. The metal layer may have a thickness of less than 30 nanometers. The metal layer may have a thickness of less than 25 nanometers. The metal layer may have a thickness of less than 20 nanometers.

[0020] The metal layer may have a thickness of 1 nanometer 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 35 nanometers or more. The metal layer may have a thickness of 40 nanometers or more. The metal layer may have a thickness of 45 nanometers or more. The metal layer may have a thickness of 50 nanometers or more. The metal layer may have a thickness of 60 nanometers or more. The metal layer may have a thickness of 70 nanometers or more. The metal layer may have a thickness of 80 nanometers or more. The metal layer may have a thickness of 90 nanometers or more. The metal layer may have a thickness of 100 nanometers or more. The metal layer may have a thickness of 150 nanometers or more. The metal layer may have a thickness of 200 nanometers or more. The metal layer may have a thickness of 250 nanometers or more. The metal layer may have a thickness of 300 nanometers or more. The metal layer may have a thickness of 350 nanometers or more. The metal layer may have a thickness of 400 nanometers or more. The metal layer may have a thickness of 450 nanometers or more. The metal layer may have a thickness of 500 nanometers or more. The metal layer may have a thickness of 1000 nanometers or more. The metal layer may have a thickness of 2000 nanometers or more. The metal layer may have a thickness of 3000 nanometers or more. The metal layer may have a thickness of 4000 nanometers or more.

[0021] The metal layer may have a thickness of 1 nanometer to 1000 nanometers. The metal layer may have a thickness of 1 nanometer to 900 nanometers. The metal layer may have a thickness of 1 nanometer to 800 nanometers. The metal layer may have a thickness of 1 nanometer to 700 nanometers. The metal layer may have a thickness of 1 nanometer to 600 nanometers. The metal layer may have a thickness of 1 nanometer to 500 nanometers. The metal layer may have a thickness of 1 nanometer to 400 nanometers. The metal layer may have a thickness of 1 nanometer to 300 nanometers. The metal layer may have a thickness of 1 nanometer to 200 nanometers. The metal layer may have a thickness of 1 nanometer to 100 nanometers. The metal layer may have a thickness of 1 nanometer to 90 nanometers. The metal layer may have a thickness of 1 nanometer to 80 nanometers. The metal layer may have a thickness of 1 nanometer to 70 nanometers. The metal layer may have a thickness of 1 nanometer to 60 nanometers. The metal layer may have a thickness of 1 nanometer to 50 nanometers. The metal layer may have a thickness of 1 nanometer to 40 nanometers. The metal layer may have a thickness of 1 nanometer to 30 nanometers. The metal layer may have a thickness of 1 nanometer to 20 nanometers.

[0022] The metal layer may have a thickness of 10 nanometers to 200 nanometers. The metal layer may have a thickness of 10 nanometers to 150 nanometers. The metal layer may have a thickness of 10 nanometers to 100 nanometers. The metal layer may have a thickness of 10 nanometers to 90 nanometers. The metal layer may have a thickness of 15 nanometers to 90 nanometers. The metal layer may have a thickness of 15 nanometers to 80 nanometers. The metal layer may have a thickness of 20 nanometers to 80 nanometers. The metal layer may have a thickness of 20 nanometers to 70 nanometers. The metal layer may have a thickness of 25 nanometers to 70 nanometers. The metal layer may have a thickness of 25 nanometers to 60 nanometers. The metal layer may have a thickness of 30 nanometers to 60 nanometers. The metal layer may have a thickness of 30 nanometers to 50 nanometers. The metal layer may have a thickness of 30 nanometers to 45 nanometers. The metal layer may have a thickness of 30 nanometers to 40 nanometers.

[0023] The metal layer may be wrapped around at least 50 percent of the length of the rod of the aerosol-forming substrate. The metal layer may be wrapped around at least 60 percent of the length of the rod of the aerosol-forming substrate. The metal layer may be wrapped around at least 70 percent of the length of the rod of the aerosol-forming substrate. The metal layer may be wrapped around at least 80 percent of the length of the rod of the aerosol-forming substrate. The metal layer may be wrapped around at least 90 percent of the length of the rod of the aerosol-forming substrate.

[0024] The metal layer may be wrapped around the entire length of the rod of the aerosol-forming substrate.

[0025] The wrapper may be wrapped around at least 50 percent of the length of the rod of the aerosol-forming substrate. The wrapper may be wrapped around at least 60 percent of the length of the rod of the aerosol-forming substrate. The wrapper may be wrapped around at least 70 percent of the length of the rod of the aerosol-forming substrate. The wrapper may be wrapped around at least 80 percent of the length of the rod of the aerosol-forming substrate. The wrapper may be wrapped around at least 90 percent of the length of the rod of the aerosol-forming substrate.

[0026] The wrapper may be wrapped around the entire length of the rod of the aerosol-forming substrate.

[0027] The wrapper may include a paper layer.

[0028] As used herein, the term "paper layer" is used to describe a layer formed from cellulosic fibers.

[0029] The paper layer may be a non-metallic layer, in other words, the paper layer is not a metal layer or an alloy layer.

[0030] The metal layer may be radially inward of the paper layer.

[0031] Alternatively, the metal layer may be radially outward of the paper layer.

[0032] 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 very thin.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The paper layer may have a thickness of 20 micrometers to 120 micrometers. The paper layer may have a thickness of 20 micrometers to about 100 micrometers. The paper layer may have a thickness of 20 micrometers to 80 micrometers.

[0038] 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.

[0039] The aerosol-generating article may comprise a plurality of susceptor elements.

[0040] The susceptor element may be embedded within a rod of the aerosol-forming substrate.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] The susceptor element may extend the entire length of the rod of the aerosol-forming substrate.

[0045] The susceptor element may be a plurality of susceptor particles that may be deposited on or embedded within the rod of the aerosol-forming substrate. The susceptor particles may be immobilized by the rod of the aerosol-forming substrate and remain in their initial position. The susceptor particles may be uniformly distributed in the rod of the aerosol-forming substrate. Due to the particle properties of the susceptor, heat may be generated according to the distribution of the particles in the rod of 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 the rod of the aerosol-forming substrate or embedded within the rod of the aerosol-forming substrate. The aerosol-forming substrate may include one or more susceptor strips.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] The aerosol-generating article may comprise an outermost wrapper wrapped around at least the rod of aerosol-forming substrate and a wrapper.

[0054] The outermost wrapper may be formed from paper.

[0055] 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.

[0056] 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.

[0057] The upstream element may include a porous element, which may not significantly change the draw resistance of the aerosol-generating article.

[0058] The upstream element may include an annular element.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] The upstream element may have a diameter approximately equal to the diameter of the aerosol-generating article.

[0064] 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.

[0065] The upstream element may have a length of 5 millimeters.

[0066] 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.

[0067] The aerosol-generating article may comprise a downstream element located downstream of the aerosol-forming substrate. The downstream element may be located adjacent to the aerosol-forming substrate.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] The downstream element may comprise a hollow tubular segment, which may also be located adjacent to the aerosol-forming substrate.

[0074] The hollow tubular segment may include a cellulose acetate tube.The hollow tubular segment may include two cellulose acetate tubes.

[0075] 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.

[0076] The downstream element may comprise a hollow tubular segment.

[0077] The downstream element may include a filter plug element.

[0078] 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 extending in a downstream direction from the mouthpiece element.

[0079] 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.

[0080] 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.

[0081] As used herein, the term "weight percent" refers to dry weight unless otherwise indicated.

[0082] The aerosol-forming substrate may have an aerosol former content of 5 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 10 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 15 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 20 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 25 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 30 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 35 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 40 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 45 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 50 percent by weight or more. The aerosol-forming substrate may have an aerosol former content of 60 percent by weight or more. 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.

[0083] The aerosol-forming substrate may have an aerosol former content of less than 95 percent by weight. 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. The aerosol-forming substrate may have an aerosol former content of less than 50 percent by weight. The aerosol-forming substrate may have an aerosol former content of less than 40 percent by weight.

[0084] The aerosol generating system may comprise an aerosol generating device.

[0085] The aerosol generating device may include a housing defining a device cavity configured to receive at least a portion of the aerosol generating article.

[0086] The aerosol-generating device may comprise an atomizer configured to generate an aerosol from an aerosol-forming substrate.

[0087] The atomizer may be a thermal atomizer.

[0088] As used herein, the term "thermal atomizer" refers to an atomizer that is configured to heat an aerosol-forming substrate to generate an aerosol.

[0089] 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 example, the thermal atomizer may comprise an electric heater including a heating element. The heating element may be a resistive heating element. In one example, 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 the inside. In another example, the heating element may partially or completely surround the aerosol-forming substrate and heat the aerosol-forming substrate circumferentially from the outside.

[0090] 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.

[0091] The aerosol-generating device may include a susceptor. The susceptor elements may be as described above in relation to the aerosol-generating article.

[0092] 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.

[0093] 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.

[0094] The aerosol generating device may comprise a power source. The power source may be a DC power source. The power source may comprise a battery.

[0095] The aerosol generating device may include a controller, which may include a microcontroller, which may be programmed to control the power provided from the power source to the atomizer.

[0096] Where the thermal atomizer is an induction heating device, the controller may be programmed to control the duration of each pulse of power supplied by the power supply to the induction heating device. The controller may be programmed to control the duration of the time interval between successive pulses of power supplied by the power supply to the induction heating device. The controller may control the apparent resistance (R a The controller can be programmed to determine the voltage (V DC ) and the current drawn from the power supply (I DC ) from at least one of the measurements of the apparent resistance (R aThe controller can be programmed to determine the temperature of the susceptor element of the aerosol-generating article based on the apparent resistance (R a The controller may be further programmed to determine the temperature of the aerosol-forming substrate of the aerosol-generating article from the temperature of the susceptor element.

[0097] If the aerosol generating device includes a controller that controls the power supplied to the atomizer, a wrapper having a thick metal layer may interact with the control provided by the controller, which may result in inefficient heating of the susceptor element. Advantageously, the thinness of the metal layer of the wrapper may reduce interference between the metal layer and the controller, which may result in more consistent heating of the susceptor element.

[0098] 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 will also be understood that an aerosol generator according to the present disclosure may be provided 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.

[0099] 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.

[0100] [Example] Example 1. 1. An aerosol-generating article comprising: a rod of an aerosol-forming substrate, the rod comprising a susceptor element disposed within the aerosol-forming substrate; a wrapper wrapped around the rod of aerosol-forming substrate, The wrapper includes a metal layer; The aerosol-generating article, wherein the metal layer has a thickness of less than 100 nanometers. Example 2. 2. The aerosol-generating article of example 1, wherein the metal layer has a thickness of less than 80 nanometers. Example 3. 3. The aerosol-generating article of example 1 or 2, wherein the metal layer has a thickness of less than 60 nanometers. Example 4. 4. An aerosol-generating article according to any one of Examples 1 to 3, wherein the metal layer has a thickness of less than 40 nanometers. Example 5. 5. An aerosol-generating article according to any one of Examples 1 to 4, wherein the metal layer has a thickness of 20 nanometers or more. Example 6. 6. An aerosol-generating article according to any one of Examples 1 to 5, wherein the metal layer has a thickness of 25 nanometers or more. Example 7. 7. An aerosol-generating article according to any one of Examples 1 to 6, wherein the metal layer has a thickness of 30 nanometers or more. Example 8. 8. An aerosol-generating article according to any one of Examples 1 to 7, wherein the metal layer has a thickness of from 1 nanometer to 100 nanometers. Example 9. 9. An aerosol-generating article according to any one of Examples 1 to 8, wherein the metal layer has a thickness of from 10 nanometers to 100 nanometers. Example 10. 10. An aerosol-generating article as described in any one of Examples 1 to 9, wherein the metal layer has a thickness of from 20 nanometers to 80 nanometers. Example 11. 11. An aerosol-generating article according to any one of Examples 1 to 10, wherein the metal layer has a thickness of from 25 nanometers to 60 nanometers. Example 12. 12. An aerosol-generating article according to any one of Examples 1 to 11, wherein the metal layer has a thickness of from 30 nanometers to 40 nanometers. Example 13. An aerosol-generating article according to any one of Examples 1 to 12, wherein the wrapper is wrapped around at least 50 percent of the length of the rod of aerosol-forming substrate. Example 14. An aerosol-generating article according to any one of Examples 1 to 13, wherein the wrapper is wrapped around at least 90 percent of the length of the rod of aerosol-forming substrate. Example 15. An aerosol-generating article according to any one of Examples 1 to 14, wherein the wrapper is wrapped around the entire length of the rod of aerosol-forming substrate. Example 16. 16. The aerosol-generating article of any one of Examples 1 to 15, wherein the susceptor element extends the entire length of the rod of the aerosol-forming substrate. Example 17. An aerosol-generating article according to any one of Examples 1 to 16, wherein the susceptor element is rod-shaped. Example 18. An aerosol-generating article according to any one of Examples 1 to 17, wherein the susceptor element has a diameter of less than 5 millimeters. Example 19. An aerosol-generating article according to any one of Examples 1 to 18, wherein the susceptor element has a diameter of less than 4 millimeters. Example 20. 20. The aerosol-generating article of any one of Examples 1-19, wherein the susceptor element has a diameter of 1 millimeter or greater. Example 21. 21. The aerosol-generating article of any one of Examples 1-20, wherein the susceptor element has a diameter of 2 millimeters or more. Example 22. 22. The aerosol-generating article of any one of Examples 1-21, wherein the susceptor element has a diameter of 1 millimeter to 5 millimeters. Example 23. 23. The aerosol-generating article of any one of Examples 1 to 22, wherein the susceptor element has a diameter of between 2 millimeters and 4 millimeters. Example 24. An aerosol-generating article according to any one of Examples 1 to 23, wherein the susceptor element is located along the centerline of the rod of the aerosol-forming substrate. Example 25. The aerosol-generating article of any one of Examples 1 to 24, wherein the aerosol-forming substrate comprises a gel. Example 26. The aerosol-generating article according to any one of Examples 1 to 24, wherein the aerosol-forming substrate comprises a film. Example 27. 25. The aerosol-generating article of any one of Examples 1 to 24, wherein the aerosol-forming substrate comprises crimped tobacco. Example 28. The aerosol-generating article according to any one of Examples 1 to 24, wherein the aerosol-forming substrate comprises a tobacco cut filler. Example 29. An aerosol-generating article according to any one of Examples 1 to 28, comprising an upstream element located upstream of the rod of the aerosol-forming substrate. Example 30. 30. The aerosol-generating article of example 29, wherein the upstream element comprises an annular element. Example 31. The aerosol-generating article of example 29 or 30, wherein the wrapper is wrapped around at least a portion of the upstream element. Example 32. 32. The aerosol-generating article of example 31, wherein the wrapper covers the entire length of the upstream element. Example 33. An aerosol-generating article according to any one of Examples 1 to 32, comprising a downstream element downstream of the rod of the aerosol-forming substrate. Example 34. 34. The aerosol-generating article of example 33, wherein the downstream element is a hollow tubular segment. Example 35. 35. The aerosol-generating article of example 34, wherein the hollow tubular segment is a cellulose acetate tube. Example 36. 36. The aerosol-generating article of example 34 or 35, wherein the wrapper is wrapped around at least a portion of the hollow tubular segment. Example 37. An aerosol-generating article according to any one of Examples 1 to 36, wherein the metal layer comprises aluminum. Example 38. An aerosol-generating article according to any one of Examples 1 to 37, wherein the wrapper comprises a paper layer. Example 39. 39. The aerosol-generating article of Example 38, wherein the metal layer is radially inward of the paper layer. Example 40. 40. The aerosol-generating article of example 38 or 39, wherein the wrapper comprises a metal layer deposited on a paper layer. Example 41. 41. The aerosol-generating article of any one of Examples 38 to 40, wherein the paper layer has a thickness of 10 micrometers or more. Example 42. 42. The aerosol-generating article of any one of Examples 38 to 41, wherein the paper layer has a thickness of less than 120 micrometers. Example 43. The aerosol-generating article of any one of Examples 38 to 42, wherein the paper layer has a thickness of 40 micrometers to 80 micrometers. Example 44. 44. The aerosol-generating article of any one of Examples 1 to 43, wherein the aerosol-forming substrate has an aerosol former content of 5 weight percent or more. Example 45. 45. The aerosol-generating article of any one of Examples 1 to 44, wherein the aerosol-forming substrate has an aerosol former content of 20 weight percent or more. Example 46. 46. ​​The aerosol-generating article of any one of Examples 1 to 45, wherein the aerosol-forming substrate has an aerosol former content of 50 weight percent or more. Example 47. An aerosol-generating article according to any one of Examples 1 to 46, wherein the ratio of the thickness of the susceptor element to the thickness of the metal layer is less than 2500. Example 48. An aerosol-generating article according to any one of Examples 1 to 47, wherein the ratio of the thickness of the susceptor element to the thickness of the metal layer is 1500 or greater. Example 49. An aerosol-generating article according to any one of Examples 1 to 48, wherein the ratio of the thickness of the susceptor element to the thickness of the metal layer is 1500-2500. Example 50. 1. An aerosol generation system comprising: An aerosol-generating article according to any one of Examples 1 to 49, and an aerosol generating device, An atomizer, Power supply, and a controller programmed to control power supplied from the power source to the atomizer.

[0101] The invention will now be further described with reference to the figures shown in the accompanying drawings.

[0102] Aerosol generating systems for delivering aerosols to users typically include an aerosol generating article and an atomizer. The aerosol generating article includes a rod of an aerosol-forming substrate. The atomizer is configured to generate an inhalable aerosol from the aerosol-forming substrate. Some known aerosol generating systems include 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 aerosol generating systems is a nicotine formulation, which may include an aerosol former, such as glycerin.

[0103] It has been found that in some cases, a certain amount of one or more components of the aerosol-forming substrate, such as glycerin or nicotine, may escape away from the rod and migrate to other parts of the aerosol-generating article. The migration of the aerosol-forming substrate away from the rod may reduce the amount of the aerosol-forming substrate that may be vaporized and subsequently inhaled by the user. The migration of nicotine from the aerosol-forming substrate may reduce the amount of nicotine that may be inhaled by the user.

[0104] Some partial solutions to the migration of nicotine and other components away from the rod of aerosol-forming substrate may involve wrapping the rod of aerosol-forming substrate in metal foil. However, the inventors have found that there is a general prejudice in the electronic cigarette industry against the use of metal foil in aerosol-generating articles containing susceptor elements. This is due to the possibility that metal foil may interfere with the heating of the susceptor elements.

[0105] Another 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 rod of 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.

[0106] FIG. 1 illustrates an embodiment of an aerosol-generating article 10 .

[0107] The aerosol-generating article 100 includes a rod of aerosol-forming substrate 12. In one embodiment, the rod 12 is formed by crimping a portion of a sheet of cast leaf tobacco. In other embodiments, the rod of aerosol-forming substrate 12 may include a different substrate, such as, for example, a gel, a film, or a cut tobacco filler.

[0108] 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.

[0109] In the embodiment shown in FIG. 1, the aerosol-generating article 100 has a total length of about 45 millimeters.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] The support element 22 and the aerosol cooling element 24 together define an intermediate hollow section 50 of the aerosol-generating article 10 .

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] The aerosol-generating article 100 includes an elongated susceptor element 44 within the rod of aerosol-forming substrate 12. The susceptor element 44 is substantially longitudinally disposed 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] The aerosol-generating article 100 includes a wrapper 70. The wrapper 70 is wrapped around the rod of aerosol-forming substrate 12. 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.

[0129] 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.

[0130] In some embodiments, the wrapper 70 is wrapped around the entire circumferential surface area of ​​the rod 12 of the aerosol-forming substrate.

[0131] 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 .

[0132] 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.

[0133] Figures 2 and 3 show alternative embodiments to those shown in the figures. Aerosol-generating article 200 of Figure 2 and aerosol-generating article 300 of Figure 3 are identical to aerosol-generating article 100 of Figure 1, with the following differences.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 2, 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.

[0138] Exemplary formulations of suitable aerosol-forming substrates for the examples of FIGS. [Table 1] TIFF2024525726000002.tif36168

[0139] 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 to other portions of the aerosol-generating article 100. In some embodiments, this may result in an increased nicotine yield from the plug 12 of the aerosol-forming substrate.

[0140] 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.

[0141] Furthermore, while the metal layer helps to mitigate component migration away from the aerosol-forming substrate rod 12, the metal layer is thin enough so that it does not interfere with the inductive heating of the susceptor element 44. This means that the inductive heating of the susceptor element 44 may not be affected by the metal layer of the wrapper 70.

[0142] Additionally, some aerosol generating devices include a controller that monitors the amount of energy provided to the susceptor element 44. A wrapper with a thick metal layer may interact with the feedback provided to the controller, which may result in inefficient heating of the susceptor element 44. A thinner metal layer of the wrapper 70 may reduce interference between the metal layer and the controller, which may result in more consistent heating of the susceptor element 44.

[0143] 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: a rod of an aerosol-forming substrate, the rod comprising susceptor elements within the aerosol-forming substrate; and a wrapper wrapped around the rod of the aerosol-forming substrate, wherein the wrapper comprises a metal layer, and the metal layer has a thickness of less than 100 nanometers.

2. The aerosol-generating article according to claim 1, wherein the metal layer has a thickness of 25 nanometers to 60 nanometers.

3. The aerosol-generating article according to claim 1 or 2, wherein the wrapper is wrapped around at least 50 percent of the length of the rod of the aerosol-forming substrate.

4. The aerosol-generating article according to claim 1 or 2, wherein the susceptor elements have a diameter of 2 millimeters to 4 millimeters.

5. The aerosol-generating article according to claim 1 or 2, further comprising an upstream element located upstream of the rod of the aerosol-forming substrate.

6. The aerosol-generating article according to claim 5, wherein the wrapper is wrapped around at least a portion of the upstream element.

7. The aerosol-generating article according to claim 1 or 2, wherein the metal layer comprises aluminum.

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

9. The aerosol-generating article according to claim 8, wherein the wrapper comprises the metal layer deposited on the paper layer.

10. The aerosol-generating article according to claim 8, wherein the paper layer has a thickness of 40 micrometers to 80 micrometers.

11. The aerosol-generating article according to claim 1 or 2, wherein the aerosol-forming substrate has an aerosol-forming agent content of 5 weight percent or more.

12. The aerosol-generating article according to claim 1 or 2, wherein the ratio of the thickness of the susceptor elements to the thickness of the metal layer is less than 2500.

13. The aerosol-generating article according to claim 1 or 2, wherein the ratio of the thickness of the susceptor elements to the thickness of the metal layer is 1500 or more.

14. The aerosol-generating article according to claim 1 or 2, wherein the ratio of the thickness of the susceptor elements to the thickness of the metal layer is 1500 to 2500.

15. An aerosol-generating system, comprising: the aerosol-generating article according to claim 1 or 2; and an aerosol-generating device, An atomizer, a power source, and a control device programmed to control the power supplied from the power source to the atomizer, an aerosol generation system comprising the same.

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