CN117642086A

CN117642086A - Aerosol-generating article comprising a wrapper with a metal layer

Info

Publication number: CN117642086A
Application number: CN202280049381.5A
Authority: CN
Inventors: F·莫森尼
Original assignee: Philip Morris Products SA
Current assignee: Philip Morris Products SA
Priority date: 2021-07-20
Filing date: 2022-07-20
Publication date: 2024-03-01
Also published as: KR20240034231A; WO2023001929A1

Abstract

An aerosol-generating article (100) comprises an aerosol-forming substrate comprising one or more aerosol-forming agents; and a wrapper (70). The wrapper (70) wraps around the aerosol-forming substrate. The wrapper (70) includes a metal layer. The aerosol-forming substrate has an aerosol former content of greater than or equal to 40 wt%.

Description

Aerosol-generating article comprising a wrapper with a metal layer

The present invention relates to an aerosol-generating article comprising a wrapper with a metal layer.

An aerosol-generating system for delivering an aerosol to a user generally comprises an aerosol-generating article and a nebulizer. 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 include a thermal atomizer, such as an electric heater or an induction heating device. The thermal atomizer is configured to heat and vaporize an aerosol-forming substrate to generate an aerosol, which can be inhaled by a user. A typical aerosol-forming substrate for an aerosol-generating system is a nicotine formulation, which may be a liquid nicotine formulation comprising an aerosol-forming agent such as glycerol.

It is desirable to provide an aerosol-generating article that provides improved nicotine delivery.

The present invention provides an aerosol-generating article. The aerosol-generating article may comprise 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 wrap around the aerosol-forming substrate. The wrapper may comprise a metal layer. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 40 wt%.

There is also provided an aerosol-generating article comprising: an aerosol-forming substrate comprising one or more aerosol-forming agents; and a wrapper, wherein the wrapper wraps around the aerosol-forming substrate, wherein the wrapper comprises a metal layer, and wherein the aerosol-forming substrate has an aerosol former content of greater than or equal to 40 wt%.

An aerosol-generating system is also provided. The aerosol-generating system may comprise an aerosol-generating article. The aerosol-generating article may comprise 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 wrap around the aerosol-forming substrate. The wrapper may comprise a metal layer. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 40 wt%.

There is also provided an aerosol-generating system comprising an aerosol-generating article comprising: an aerosol-forming substrate comprising one or more aerosol-forming agents; and a wrapper, wherein the wrapper wraps around the aerosol-forming substrate, wherein the wrapper comprises a metal layer, and wherein the aerosol-forming substrate has an aerosol former content of greater than or equal to 40 wt%.

Providing a wrapper wrapped around the aerosol-forming substrate and comprising a metal layer will provide better nicotine delivery when the aerosol-forming substrate comprises a high amount of aerosol-forming agent.

The inventors believe that the metal layer may form a barrier between one or more surfaces of the aerosol-forming substrate and other components of the aerosol-generating article. This barrier may reduce migration of one or more components of the aerosol-forming substrate, such as the aerosol-forming agent, out of the aerosol-forming substrate and into other components of the aerosol-generating article.

Reducing migration of one or more components of the aerosol-forming substrate out of the barrier of the aerosol-forming substrate may cause an increase in the amount of nicotine delivered from the aerosol-forming substrate.

As used herein, the term "aerosol-generating article" refers to an article for generating an aerosol. Aerosol-generating articles generally comprise an aerosol-forming substrate adapted and intended to be heated or combusted to release volatile compounds that can form an aerosol. Conventional cigarettes are lit when a user applies a flame to one end of the cigarette and draws air through the other end. The localized heat provided by the flame and the oxygen in the air drawn through the cigarette causes the ends of the cigarette to be lit and the resulting combustion generates 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.

As used herein, the term "aerosol-forming substrate" refers to a substrate capable of generating volatile compounds upon heating that can form an aerosol. The aerosols generated by the aerosol-forming substrate may be visible or invisible to the human eye and may comprise droplets of vapor (e.g., fine particulate matter in the gaseous state, which is typically a liquid or solid at room temperature) as well as gases and condensed vapors.

As used herein with reference to the present invention, the term "susceptor element" refers to a material capable of converting electromagnetic energy into heat. When located within the fluctuating electromagnetic field, eddy currents induced in the susceptor element lead to heating of the susceptor element. When the susceptor element is in thermal contact with the aerosol-forming substrate, the aerosol-forming substrate is heated by the susceptor element.

The wrapper may comprise a metal layer.

The wrapper may comprise a paper layer.

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

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

The metal layer may be radially inward of the paper layer.

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

The wrapper may comprise a metal layer deposited on a paper layer. The metal layer may be formed by physical vapor deposition. Advantageously, depositing a metal layer on the paper layer may allow the package to be thinner. When the aerosol-generating article comprises a susceptor, a thin wrapper may result in less interaction with the magnetic field and it does not significantly alter the electromagnetic properties of the aerosol-generating article. In addition, the use of a thin metal layer may reduce the amount of metal required to form the metal layer, which may improve sustainability.

The wrapper may comprise a laminate of metal layers secured to a paper layer. The metal layer may be formed by lamination. Advantageously, the use of lamination may provide a package that is easier to manufacture. In addition, lamination may result in a more uniform layer. Furthermore, lamination may be a better choice than deposition for externally heated aerosol-generating articles, as the better thermal conductivity of thicker layers results in increased thermal conduction.

The wrapper may wrap around at least 50% of the entire length of the aerosol-forming substrate. The wrapper may wrap around at least 80% of the entire length of the aerosol-forming substrate. The wrapper may wrap around at least 90% of the entire length of the aerosol-forming substrate. The wrapper may wrap around at least 95% of the entire length of the aerosol-forming substrate.

The aerosol-generating article may comprise a rod comprising an aerosol-forming substrate. The rod may be formed of a porous material. The wrapper may wrap around the rod.

The aerosol-generating article may comprise a strip of aerosol-forming substrate. The wrapper may wrap around the strip.

If the metal layer is too thin, the metal layer may not be fabricated and may have poor anti-wicking properties. However, if the metal layer is too thick, there may be more interaction with the magnetic field when the aerosol-generating article is inductively heated, and the metal layer may be more expensive to manufacture.

The metal layer may have a thickness of greater than or equal to 2 nanometers. The metal layer may have a thickness of greater than or equal to 5 nanometers. The metal layer may have a thickness of greater than or equal to 10 nanometers. The metal layer may have a thickness of greater than or equal to 15 nanometers. The metal layer may have a thickness of greater than or equal to 20 nanometers. The metal layer may have a thickness greater than or equal to 25 nanometers. The metal layer may have a thickness of greater than or equal to 30 nanometers. The metal layer may have a thickness of greater than or equal to 40 nanometers. The metal layer may have a thickness of greater than or equal to 50 nanometers.

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.

The metal layer may have a thickness between 2 nanometers and 100 nanometers. The metal layer may have a thickness between 2 nanometers and 90 nanometers. The metal layer may have a thickness between 2 nm and 80 nm. The metal layer may have a thickness between 2 nanometers and 70 nanometers. The metal layer may have a thickness between 2 nanometers and 60 nanometers. The metal layer may have a thickness between 2 nanometers and 50 nanometers.

The metal layer may have a thickness between 5 nanometers and 100 nanometers. The metal layer may have a thickness between 10 nanometers and 100 nanometers. The metal layer may have a thickness between 15 nanometers and 100 nanometers. The metal layer may have a thickness between 20 nanometers and 100 nanometers. The metal layer may have a thickness between 25 nanometers and 100 nanometers. The metal layer may have a thickness between 30 nanometers and 100 nanometers. The metal layer may have a thickness between 40 nanometers and 100 nanometers. The metal layer may have a thickness between 50 nanometers and 100 nanometers.

The metal layer may have a thickness between 5 nanometers and 90 nanometers. The metal layer may have a thickness between 5 nanometers and 80 nanometers. The metal layer may have a thickness between 10 nanometers and 80 nanometers. The metal layer may have a thickness between 10 nanometers and 70 nanometers. The metal layer may have a thickness between 10 nanometers and 60 nanometers. The metal layer may have a thickness between 15 nanometers and 60 nanometers. The metal layer may have a thickness between 15 nanometers and 50 nanometers. The metal layer may have a thickness between 20 nanometers and 50 nanometers. The metal layer may have a thickness between 20 nanometers and 40 nanometers. The metal layer may have a thickness between 25 nanometers and 40 nanometers. The metal layer may have a thickness between 25 nanometers and 30 nanometers.

The metal layer may comprise one or more of the following metals: aluminum, chromium, copper, gold, nickel, silver, and tin. The metal layer may be formed of aluminum. The metal layer may include an aluminum layer. Advantageously, aluminum has a relatively low boiling point, which may make it easier to form a metal layer, particularly when vapor deposition is used. In addition, aluminum is less costly than other metals.

If the paper layer is too thin, the paper layer may not provide sufficient tear resistance. If the paper layer is too thick, the wrapper may be too difficult to roll up during manufacture, which may reduce the manufacturing speed of the aerosol-generating article.

The paper layer may have a thickness of greater than or equal to 10 microns. The paper layer may have a thickness of greater than or equal to 20 microns. The paper layer may have a thickness of greater than or equal to 40 microns.

The paper layer may have a thickness of less than 120 microns. The paper layer may have a thickness of less than 100 microns. The paper layer may have a thickness of less than 80 microns.

The paper layer may have a thickness between 10 and 120 micrometers. The paper layer may have a thickness between 10 and 100 micrometers. The paper layer may have a thickness between 10 and 80 microns.

The paper layer may have a thickness between 20 micrometers and 120 micrometers. The paper layer may have a thickness of between 20 microns and about 100 microns. The paper layer may have a thickness between 20 and 80 microns.

The paper layer may have a thickness between 40 and 120 microns. The paper layer may have a thickness between 40 micrometers and 100 micrometers. The paper layer may have a thickness between 40 and 80 microns.

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

Advantageously, providing the 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.

The upstream element may comprise a porous element. The porous element does not significantly alter the resistance to draw of the aerosol-generating article.

The upstream element may comprise an annular element.

The wrapper may wrap around at least a portion of the upstream element. The wrapper may wrap around at least 5% of the length of the upstream element. The wrapper may wrap around at least 10% of the length of the upstream element. The wrapper may wrap around at least 20% of the length of the upstream element. The wrapper may wrap around at least 30% of the length of the upstream element. The wrapper may wrap around at least 40% of the length of the upstream element. The wrapper may wrap around at least 50% of the length of the upstream element. The wrapper may wrap around the entire length of the upstream element.

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.

The upstream element may be made of any material suitable for use in aerosol-generating articles. The upstream element may be made of the same material as one of the other components for the aerosol-generating article. Suitable materials for forming the upstream element include filter materials, ceramics, polymeric materials, cellulose acetate, cardboard, zeolites, or aerosol-generating substrates. The upstream element may be formed from a cellulose acetate rod.

The upstream element may be formed of a heat resistant material. For example, the upstream element may be formed of a material that is resistant to temperatures up to 350 degrees celsius. This may ensure that the upstream element is not adversely affected by the heating means used to heat the aerosol-generating substrate.

The diameter of the upstream element may be substantially equal to the diameter of the aerosol-generating article.

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

The upstream element may have a length of 5 mm.

The length of the upstream element may advantageously be varied in order to provide a desired overall length of the aerosol-generating article. For example, where 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 so as to maintain the same overall length of the article.

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

Advantageously, providing the 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.

The wrapper may wrap around at least a portion of the downstream element. The wrapper may wrap around at least 5% of the length of the downstream element. The wrapper may wrap around at least 10% of the length of the downstream element. The wrapper may wrap around at least 20% of the length of the downstream element. The wrapper may wrap around at least 30% of the length of the downstream element. The wrapper may wrap around at least 40% of the length of the downstream element. The wrapper may wrap around at least 50% of the length of the downstream element. The wrapper may wrap around the entire length of the downstream element.

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.

The downstream element may be made of any material suitable for use in aerosol-generating articles. The downstream element may be made of the same material as one of the other components for the aerosol-generating article. Suitable materials for forming the downstream element include filter materials, ceramics, polymeric materials, cellulose acetate, cardboard, zeolites, or aerosol-generating substrates. The downstream element may be formed from a cellulose acetate rod.

The downstream element may be formed of a heat resistant material. For example, the upstream element may be formed of a material that is resistant to temperatures up to 350 degrees celsius. This may ensure that downstream elements are not adversely affected by the heating means used to heat the aerosol-generating substrate.

The downstream element may comprise a hollow tubular section. The hollow tubular section may also be positioned adjacent to the aerosol-forming substrate.

The hollow tubular section may comprise a cellulose acetate tube. The hollow tubular section may comprise two cellulose acetate tubes.

Advantageously, providing a wrapper over at least a portion of the hollow tubular section may reduce migration of components of the aerosol-forming substrate through the junction between the aerosol-forming substrate and the hollow tubular section.

The downstream element may be positioned adjacent to the aerosol-forming substrate.

The downstream element may comprise a hollow tubular section.

The downstream element may comprise a filter segment element.

The downstream element may comprise a second hollow tubular section. The second hollow tubular section may be positioned adjacent to the hollow tubular section.

The wrapper may wrap around at least a portion of the second hollow tubular section. The wrapper may wrap around at least 5% of the length of the second hollow tubular section. The wrapper may wrap around at least 10% of the length of the second hollow tubular section. The wrapper may wrap around at least 20% of the length of the second hollow tubular section. The wrapper may wrap around at least 30% of the length of the second hollow tubular section. The wrapper may wrap around at least 40% of the length of the second hollow tubular section. The wrapper may wrap around at least 50% of the length of the second hollow tubular section. The wrapper may wrap around the entire length of the second hollow tubular section.

The downstream element may comprise a mouthpiece element at its downstream end. The mouthpiece element may comprise an oral cavity. The mouth end cavity may be defined by a hollow tubular element provided at the downstream end of the mouthpiece element. Alternatively, the mouth end cavity may be defined by an outer wrapper, wherein the outer wrapper extends from the mouthpiece element in the downstream direction.

The wrapper may wrap around at least a portion of the mouthpiece element. The wrapper may wrap around at least 5% of the length of the mouthpiece element. The wrapper may wrap around at least 10% of the length of the mouthpiece element. The wrapper may wrap around at least 20% of the length of the mouthpiece element. The wrapper may wrap around at least 30% of the length of the mouthpiece element. The wrapper may wrap around at least 40% of the length of the mouthpiece element. The wrapper may wrap around at least 50% of the length of the mouthpiece element. The wrapper may wrap around the entire length of the mouthpiece element.

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

The wrapper may wrap around at least one element of the aerosol-generating article. The wrapper may wrap around at least two elements of the aerosol-generating article. The wrapper may wrap around at least three elements of the aerosol-generating article. The wrapper may wrap around at least four elements of the aerosol-generating article. The wrapper may wrap around at least five elements of the aerosol-generating article. The wrapper may wrap 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 section, a second hollow tubular section and a mouthpiece element, the wrapper may wrap around all of these elements.

The wrapper may wrap around at least 25% of the length of the aerosol-generating article. The wrapper may wrap around at least 30% of the length of the aerosol-generating article. The wrapper may wrap around at least 35% of the length of the aerosol-generating article. The wrapper may wrap around at least 40% of the length of the aerosol-generating article. The wrapper may wrap around at least 45% of the length of the aerosol-generating article. The wrapper may wrap around at least 50% of the length of the aerosol-generating article. The wrapper may wrap around at least 55% of the length of the aerosol-generating article. The wrapper may wrap around at least 60% of the length of the aerosol-generating article. The wrapper may wrap around at least 65% of the length of the aerosol-generating article. The wrapper may wrap around at least 70% of the length of the aerosol-generating article. The wrapper may wrap around at least 75% of the length of the aerosol-generating article. The wrapper may wrap around at least 80% of the length of the aerosol-generating article. The wrapper may wrap around at least 85% of the length of the aerosol-generating article. The wrapper may wrap around at least 90% of the length of the aerosol-generating article. The wrapper may wrap around at least 95% of the length of the aerosol-generating article. The wrapper may wrap around 100% of the length of the aerosol-generating article.

The wrapper may wrap around substantially the entire length of the aerosol-generating article. The wrapper may wrap around the entire length of the aerosol-generating article.

The one or more elements of the aerosol-generating article may comprise an element wrapper wrapped around substantially the entire length of the element. The one or more elements of the aerosol-generating article may comprise an element wrapper wrapped around the entire length of the element.

For example, the aerosol-forming substrate may comprise a wrapper of elements wrapped around the length of the strip of aerosol-forming substrate. The upstream element may comprise an element wrapper wrapped around the length of the upstream element. The hollow tubular section may include a wrapper of elements wrapped around the length of the hollow tubular section. The second hollow tubular section may include an element wrapper wrapped around the length of the second hollow tubular section. The mouthpiece element may comprise an element wrapper wrapped around the length of the mouthpiece element.

Preferably, one or more of the elements comprises an element wrapper when the wrapper is wrapped around the length of at least two elements of the aerosol-generating article.

The component package may comprise a paper layer.

The wrapper may wrap around and over the one or more component wrappers.

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.

The aerosol-forming substrate may comprise a colloid. The colloid may have discontinuous solid particles dispersed in a continuous liquid. The colloid may have discontinuous liquid particles dispersed in a continuous liquid. The colloid may have discontinuous liquid particles dispersed in a continuous solid.

The aerosol-forming substrate may be a solid.

The aerosol-forming substrate may be a film.

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

The aerosol-forming substrate may have an aerosol former content of greater than 5% by weight. The aerosol-forming substrate may have an aerosol former content of greater than 10% by weight. The aerosol-forming substrate may have an aerosol former content of greater than 15% by weight. The aerosol-forming substrate may have an aerosol former content of greater than 20% by weight. The aerosol-forming substrate may have an aerosol former content of greater than 25% by weight. The aerosol-forming substrate may have an aerosol former content of greater than 30% by weight. The aerosol-forming substrate may have an aerosol former content of greater than 35% by weight. The aerosol-forming substrate may have an aerosol former content of greater than 40% by weight. The aerosol-forming substrate may have an aerosol former content of greater than 45% by weight. The aerosol-forming substrate may have an aerosol former content of greater than 50% by weight. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 60 wt%. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 70 wt%. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 80 wt%. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 90 wt%. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 95 wt%. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 97 wt%. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 99 wt%.

The aerosol-forming substrate may have an aerosol former content of greater than or equal to 99 wt%. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 97 wt%. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 95 wt%. The aerosol-forming substrate may have an aerosol former content of less than 90% by weight. The aerosol-forming substrate may have an aerosol former content of less than 80% by weight. The aerosol-forming substrate may have an aerosol former content of less than 70% by weight. The aerosol-forming substrate may have an aerosol former content of less than 60% by weight.

The aerosol-forming substrate may have an aerosol former content of between 40% and 90% by weight. The aerosol-forming substrate may have an aerosol former content of between 40% and 80% by weight. The aerosol-forming substrate may have an aerosol former content of between 40% and 70% by weight. The aerosol-forming substrate may have an aerosol former content of between 40% and 60% by weight. The aerosol-forming substrate may have an aerosol former content of between 40% and 50% by weight.

The aerosol-forming substrate may have an aerosol former content of between 40% and 90% by weight. The aerosol-forming substrate may have an aerosol former content of between 50% and 90% by weight. The aerosol-forming substrate may have an aerosol former content of between 60% and 90% by weight. The aerosol-forming substrate may have an aerosol former content of between 70% and 90% by weight. The aerosol-forming substrate may have an aerosol former content of between 80% and 90% by weight.

The aerosol-forming substrate may have an aerosol former content of between 50% and 90% by weight. The aerosol-forming substrate may have an aerosol former content of between 50% and 80% by weight. The aerosol-forming substrate may have an aerosol former content of between 60% and 80% by weight. The aerosol-forming substrate may have an aerosol former content of between 60% and 70% by weight.

The aerosol-forming substrate may have an aerosol former content of greater than or equal to 100 milligrams. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 200 mg. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 250 milligrams.

The aerosol-forming substrate may have an aerosol former content of less than 500 mg. The aerosol-forming substrate may have an aerosol former content of less than 400 mg. The aerosol-forming substrate may have an aerosol former content of less than 300 mg.

The aerosol-forming substrate may have an aerosol former content of between 100 mg and 500 mg. The aerosol-forming substrate may have an aerosol former content of between 100 mg and 400 mg. The aerosol-forming substrate may have an aerosol former content of between 200 mg and 400 mg. The aerosol-forming substrate may have an aerosol former content of between 200 mg and 300 mg.

The aerosol-forming substrate may have an aerosol former content of greater than or equal to 0.05 g/cc. The aerosol-forming substrate may have an aerosol former content of greater than or equal to 0.1 g/cc.

The aerosol-forming substrate may have an aerosol former content of less than 0.3 g/cc. The aerosol-forming substrate may have an aerosol former content of less than 0.25 g/cc.

The aerosol-forming substrate may have an aerosol former content of between 0.05 g/cc and 0.3 g/cc. The aerosol-forming substrate may have an aerosol former content of between 0.1 g/cc and 0.25 g/cc.

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.

The aerosol-forming substrate may comprise water.

The aerosol-forming substrate may have a water content of greater than or equal to 10 wt%. The aerosol-forming substrate may have a water content of greater than or equal to 15 wt%. The aerosol-forming substrate may have a water content of greater than or equal to 20 wt%.

The aerosol-forming substrate may have a water content of less than 30% by weight. The aerosol-forming substrate may have a water content of less than 25% by weight. The aerosol-forming substrate may have a water content of less than 20% by weight.

The aerosol-forming substrate may have a water content of between 10% and 30% by weight. The aerosol-forming substrate may have a water content of between 10% and 25% by weight. The aerosol-forming substrate may have a water content of between 15% and 25% by weight. The aerosol-forming substrate may have a water content of between 15% and 20% by weight. The aerosol-forming substrate may have a water content of between 20% and 25% by weight.

The aerosol-forming substrate may comprise nicotine.

The aerosol-forming substrate may have a nicotine content of greater than or equal to 0.5% by weight. The aerosol-forming substrate may have a nicotine content of greater than or equal to 1% by weight. The aerosol-forming substrate may have a nicotine content of greater than or equal to 1.5% by weight. The aerosol-forming substrate may have a nicotine content of greater than or equal to 2% by weight. The aerosol-forming substrate may have a nicotine content of greater than or equal to 2.5% by weight. The aerosol-forming substrate may have a nicotine content of greater than or equal to 5% by weight.

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

The aerosol-forming substrate may have a nicotine content of between 0.5% and 5% by weight. The aerosol-forming substrate may have a nicotine content of between 0.5% and 2.5% by weight. The aerosol-forming substrate may have a nicotine content of between 1% and 2.5% by weight. The aerosol-forming substrate may have a nicotine content of between 1% and 2% by weight. The aerosol-forming substrate may have a nicotine content of between 1.5% and 2% by weight. The aerosol-forming substrate may have a nicotine content of between 1% and 1.5% by weight.

The aerosol-forming substrate may comprise a film-forming agent.

The film former may be a cellulose-based film former.

The cellulose-based film former may be carboxymethyl cellulose.

The carboxymethyl cellulose may be sodium carboxymethyl cellulose.

The aerosol-forming substrate may have a film former content of greater than or equal to 0.5 wt%. The aerosol-forming substrate may have a film former content of greater than or equal to 1 wt%. The aerosol-forming substrate may have a film former content of greater than or equal to 1.5 wt%. The aerosol-forming substrate may have a film former content of greater than or equal to 2 wt%. The aerosol-forming substrate may have a film former content of greater than or equal to 2.4 wt%. The aerosol-forming substrate may have a film former content of greater than or equal to 2.5 wt%.

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

The aerosol-forming substrate may have a film former content of between 0.5% and 5% by weight. The aerosol-forming substrate may have a film former content of between 0.5% and 4% by weight. The aerosol-forming substrate may have a film former content of between 1% and 4% by weight. The aerosol-forming substrate may have a film former content of between 1% and 3% by weight. The aerosol-forming substrate may have a film former content of between 1.5% and 3% by weight. The aerosol-forming substrate may have a film former content of between 1.5% and 2.5% by weight. The aerosol-forming substrate may have a film former content of between 2% and 2.5% by weight.

The aerosol-forming substrate may have a carboxymethyl cellulose content of greater than or equal to 0.5 wt%. The aerosol-forming substrate may have a carboxymethyl cellulose content of greater than or equal to 1 wt%. The aerosol-forming substrate may have a carboxymethyl cellulose content of greater than or equal to 1.5 wt%. The aerosol-forming substrate may have a carboxymethyl cellulose content of greater than or equal to 2 wt%. The aerosol-forming substrate may have a carboxymethyl cellulose content of greater than or equal to 2.4 wt%. The aerosol-forming substrate may have a carboxymethyl cellulose content of greater than or equal to 2.5 wt%.

The aerosol-forming substrate may have a carboxymethyl cellulose content of less than 5 wt%. The aerosol-forming substrate may have a carboxymethyl cellulose content of less than 4 wt%. The aerosol-forming substrate may have a carboxymethyl cellulose content of less than 3 wt%. The aerosol-forming substrate may have a carboxymethyl cellulose content of less than 2.5 wt%.

The aerosol-forming substrate may have a carboxymethyl cellulose content of between 0.5% and 5% by weight. The aerosol-forming substrate may have a carboxymethyl cellulose content of between 0.5% and 4% by weight. The aerosol-forming substrate may have a carboxymethyl cellulose content of between 1% and 4% by weight. The aerosol-forming substrate may have a carboxymethyl cellulose content of between 1% and 3% by weight. The aerosol-forming substrate may have a carboxymethyl cellulose content of between 1.5% and 3% by weight. The aerosol-forming substrate may have a carboxymethyl cellulose content of between 1.5% and 2.5% by weight.

The aerosol-forming substrate may have a carboxymethyl cellulose content of between 2% and 2.5% by weight.

The aerosol-forming substrate may comprise one or more acids.

The one or more acids may be one or more organic acids.

The one or more organic acids may be one or more carboxylic acids.

The one or more carboxylic acids may be lactic acid.

The one or more carboxylic acids may be levulinic acid.

The aerosol-forming substrate may have an acid content of greater than or equal to 0.5 wt%. The aerosol-forming substrate may have an acid content of greater than or equal to 1 wt%. The aerosol-forming substrate may have an acid content of greater than or equal to 1.5 wt%. The aerosol-forming substrate may have an acid content of greater than or equal to 1.7 wt%. The aerosol-forming substrate may have an acid content of greater than or equal to 2 wt%.

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

The aerosol-forming substrate may have an acid content of between 0.5% and 5% by weight. The aerosol-forming substrate may have an acid content of between 0.5% and 2.5% by weight. The aerosol-forming substrate may have an acid content of between 1% and 2.5% by weight. The aerosol-forming substrate may have an acid content of between 1% and 2% by weight. The aerosol-forming substrate may have an acid content of between 1.5% and 2% by weight.

The aerosol-forming substrate may have a lactic acid content of greater than or equal to 0.5 wt%. The aerosol-forming substrate may have a lactic acid content of greater than or equal to 1 wt%. The aerosol-forming substrate may have a lactic acid content of greater than or equal to 1.5 wt%. The aerosol-forming substrate may have a lactic acid content of greater than or equal to 1.7 wt%. The aerosol-forming substrate may have a lactic acid content of greater than or equal to 2 wt%.

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

The aerosol-forming substrate may have a lactic acid content of between 0.5% and 5% by weight. The aerosol-forming substrate may have a lactic acid content of between 0.5% and 2.5% by weight. The aerosol-forming substrate may have a lactic acid content of between 1% and 2.5% by weight. The aerosol-forming substrate may have a lactic acid content of between 1% and 2% by weight. The aerosol-forming substrate may have a lactic acid content of between 1.5% and 2% by weight.

The aerosol-forming substrate may have a moisture content of greater than or equal to 10 wt%. The aerosol-forming substrate may have a moisture content of greater than or equal to 15 wt%. The aerosol-forming substrate may have a moisture content of greater than or equal to 20 wt%. The aerosol-forming substrate may have a moisture content of greater than or equal to 25 wt%.

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

The aerosol-forming substrate may have a moisture content of between 10% and 30% by weight. The aerosol-forming substrate may have a moisture content of between 10% and 25% by weight. The aerosol-forming substrate may have a moisture content of between 10% and 20% by weight. The aerosol-forming substrate may have a moisture content of between 10% and 15% by weight.

The aerosol-forming substrate may have a moisture content of between 15% and 30% by weight. The aerosol-forming substrate may have a moisture content of between 20% and 30% by weight. The aerosol-forming substrate may have a moisture content of between 25% and 30% by weight.

The aerosol-forming substrate may have a moisture content of between 15% and 25% by weight. The aerosol-forming substrate may have a moisture content of between 20% and 25% by weight. The aerosol-forming substrate may have a moisture content of between 15% and 20% by weight.

The moisture content was measured according to the method defined in the following description.

The term "length" denotes the size of the aerosol-generating article or a component of the aerosol-generating article in the longitudinal direction.

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 mm. The aerosol-generating article may have a length of less than 70 mm. The aerosol-generating article may have a length of less than 60 mm. The aerosol-generating article may have a length of less than 50 mm.

The aerosol-generating article may have a length of greater than or equal to 30 millimeters. The aerosol-generating article may have a length of greater than or equal to 35 millimeters. The aerosol-generating article may have a length of greater than or equal to 38 millimeters. The aerosol-generating article may have a length of greater than or equal to 40 millimeters. The aerosol-generating article may have a length of greater than or equal to 42 millimeters. The aerosol-generating article may have a length of greater than or equal to 45 millimeters.

The aerosol-generating article may have a length of between 38 mm and 70 mm. The aerosol-generating article may have a length of between 40 mm and 70 mm. The aerosol-generating article may have a length of between 42 mm and 70 mm.

The aerosol-generating article may have a length of between 38 mm and 60 mm. The aerosol-generating article may have a length of between 40 mm and 60 mm.

The aerosol-generating article may have a length of between 38 mm and 50 mm. The aerosol-generating article may have a length of between 42 mm and 50 mm.

The aerosol-generating article may have a length of 45 mm.

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 mm.

The aerosol-generating article may have an outer diameter of greater than or equal to 5 millimeters. The aerosol-generating article may have an outer diameter of greater than or equal to 6 millimeters. The aerosol-generating article may have an outer diameter of greater than or equal to 7 millimeters.

The aerosol-generating article may have an outer diameter of between 5 mm and 12 mm. The aerosol-generating article may have an outer diameter of between 6 mm and 12 mm. The aerosol-generating article may have an outer diameter of between 7 mm and 12 mm.

The aerosol-generating article may have an outer diameter of between 5mm and 10 mm. The aerosol-generating article may have an outer diameter of between 6 mm and 10 mm. The aerosol-generating article may have an outer diameter of between 7 mm and 10 mm.

The aerosol-generating article may have an outer diameter of between 5mm and 8 mm. The aerosol-generating article may have an outer diameter of between 6 mm and 8 mm. The aerosol-generating article may have an outer diameter of between 7 mm and 8 mm.

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

The outermost wrap may be formed from paper.

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

The susceptor element may be an elongated susceptor element. The susceptor element may be strip-shaped. The susceptor element may be flat. Preferably, the susceptor element has a length of 12 mm. Preferably, the susceptor element has a width of 5 mm. Preferably, the susceptor element has a thickness of 60 μm.

The term "elongated" when used in the description of a susceptor element means that the length dimension of the susceptor element is greater than its width dimension or its thickness dimension. For example, the length dimension may be greater than twice the width dimension or the thickness dimension.

The susceptor element may be arranged substantially longitudinally within the aerosol-generating article. This means that the length dimension of the susceptor element is arranged substantially parallel to the longitudinal direction of the aerosol-generating article. For example, the susceptor element may be arranged within plus or minus 10 degrees parallel to the longitudinal direction of the aerosol-generating article. The susceptor element may be positioned in a radially central position within the aerosol-generating article. The susceptor element may extend along a longitudinal axis of the strip.

The susceptor element may be provided within the aerosol-forming substrate. The susceptor element may extend the entire length of the aerosol-forming substrate.

The susceptor element may be a plurality of susceptor particles, which may be deposited on or embedded within the aerosol-forming substrate. The susceptor particles may be fixed and held in an initial position by the aerosol-forming substrate. The susceptor particles may be uniformly distributed in the aerosol-forming substrate. Due to the particulate nature of the susceptor, heat may be generated according to the distribution of particles in the aerosol-forming substrate. Alternatively, the susceptor element may be in the form of one or more sheets, strips, chips or strips, which may be placed beside or embedded in the aerosol-forming substrate. The aerosol-forming substrate may comprise one or more susceptor strips.

As used herein, the term "thickness" refers to the distance from one external face to the other external face through the susceptor. The susceptor element may have a thickness of between 1 and 5 mm. The susceptor element may have a thickness of between 0.01 and 2 mm. The susceptor element may have a thickness of between 0.5 and 2 mm. The susceptor element may have a thickness of between 10 and 500 micrometers. The susceptor element may have a thickness of between 10 and 100 micrometers.

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 between 1 and 5 mm. The diameter of a susceptor having a non-circular cross-section, such as a flat susceptor, may be equivalent to the thickness of a flat susceptor.

The susceptor element may have a diameter of less than 5 mm. The susceptor element may have a diameter of less than 4 mm. The susceptor element may have a diameter of less than 3 mm. The susceptor element may have a diameter of less than 2 mm.

The susceptor element may have a diameter greater than or equal to 1 millimeter. The susceptor element may have a diameter greater than or equal to 2 millimeters. The susceptor element may have a diameter greater than or equal to 3 millimeters. The susceptor element may have a diameter greater than or equal to 4 millimeters.

For example, when 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.

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.

The ratio of the thickness of the susceptor element to the thickness of the metal layer may be greater than or equal to 1000. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be greater than or equal to 1250. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be greater than or equal to 1500. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be greater than or equal to 1750. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be greater than or equal to 2000. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be greater than or equal to 2250. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be greater than or equal to 2500. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be greater than or equal to 2750. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be greater than or equal to 3000. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be between 1000 and 3000. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be between 1250 and 3000. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be between 1250 and 2750. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be between 1500 and 2750. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be between 1500 and 2500. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be between 1750 and 2500. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be between 1750 and 2250. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be between 2000 and 2250. The ratio of the thickness of the susceptor element to the thickness of the metal layer may be between 1750 and 2000.

The total exposed surface area of the aerosol-forming substrate may be maximized by increasing the bulk density of the aerosol-forming substrate so that the rods of aerosol-forming substrate per unit volume may provide a greater amount of substrate and thus potentially a greater exposed surface area. Whereby the efficiency of aerosol release from a given volume of aerosol-forming substrate may be improved.

When the bulk density is high, it may be particularly important to mitigate migration of the components away from the aerosol-forming substrate, as the aerosol-forming substrate is in moving contact with the wrapper.

The bulk density of the aerosol-forming substrate may be greater than or equal to 100 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be greater than or equal to 200 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be greater than or equal to 300 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be greater than or equal to 400 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be greater than or equal to 500 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be greater than or equal to 600 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be greater than or equal to 750 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be greater than or equal to 850 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be greater than or equal to 1000 mg/cc of aerosol-forming substrate.

The bulk density of the aerosol-forming substrate may be less than 2000 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 1750 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 1500 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 1250 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 1000 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 850 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 750 mg/cc of aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be less than 600 mg/cc of aerosol-forming substrate.

The bulk density of the aerosol-forming substrate may be between 100 mg/cc aerosol-forming substrate and 2000 mg/cc aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be between 200 mg/cc aerosol-forming substrate and 1500 mg/cc aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be between 300 mg/cc aerosol-forming substrate and 1000 mg/cc aerosol-forming substrate. The bulk density of the aerosol-forming substrate may be between 400 mg/cc aerosol-forming substrate and 600 mg/cc aerosol-forming substrate.

The bulk density of the aerosol-forming substrate corresponds to the total weight (in milligrams) of the aerosol-forming substrate (excluding the weight of any carrier material) divided by the total volume (in cubic centimeters) of the aerosol-forming substrate.

The aerosol-generating system may comprise an aerosol-generating device.

The aerosol-generating device may comprise a housing defining a device cavity configured to receive at least a portion of the aerosol-generating article.

The aerosol-generating device may comprise a nebulizer configured to generate an aerosol from an aerosol-forming substrate.

The atomizer may be a thermal atomizer.

As used herein, the term "thermal atomizer" describes an atomizer configured to heat an aerosol-forming substrate to generate an aerosol.

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 include an electric heater. In one example, the thermal atomizer may include an electric heater that includes 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 within. In another example, the heating element may partially or completely surround the aerosol-forming substrate and circumferentially heat the aerosol-forming substrate from an exterior thereof.

In another example, the thermal atomizer may include an induction heating device. The induction heating device generally comprises an induction source configured to be coupled with a susceptor element, which may be provided outside the aerosol-forming substrate or inside the aerosol-forming substrate. The induction source generates an alternating electromagnetic field which induces magnetization or eddy currents in the susceptor element. The susceptor element may be heated due to hysteresis losses or induced eddy currents which heat the susceptor element by ohmic or resistive heating.

The aerosol-generating device may comprise a susceptor. The susceptor element may be as described above in relation to the aerosol-generating article.

An aerosol-generating device comprising 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 mainly by conduction.

Examples of electrically operated aerosol-generating systems with induction heating means and aerosol-generating articles with susceptor elements are described in WO-A1-95/27411 and WO-A1-2015/177255.

The aerosol-generating device may comprise a battery and control electronics.

It should be understood that any features described herein with respect to one embodiment of an aerosol-forming substrate, an aerosol-generating article, an aerosol-generating device or an aerosol-generating system may also be applicable 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. Features described with respect to one embodiment may be equally applicable to another embodiment according to the present disclosure. It should also be appreciated that an aerosol generator according to the present disclosure may be provided in an aerosol-generating device without a cartridge. Thus, any of the features described herein with respect to the cartridge may be equally applicable to an aerosol-generating device.

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

Ex1 an aerosol-generating article comprising:

an aerosol-forming substrate comprising one or more aerosol-forming agents; and

The package is provided with a plurality of layers of material,

wherein the wrapper is wrapped around the aerosol-forming substrate,

wherein the wrapper comprises a metal layer, and

wherein the aerosol-forming substrate has an aerosol former content of greater than or equal to 40 wt%.

Ex2 the aerosol-generating article of example EX1, wherein the wrapper comprises a paper layer.

Ex3 the aerosol-generating article of example EX2, wherein the metal layer is radially inward of the paper layer.

Ex4 the aerosol-generating article according to example EX2 or example EX3, wherein the wrapper comprises a metal layer deposited on a paper layer.

Ex5 the aerosol-generating article according to example EX2 or example EX3, wherein the wrapper comprises a laminate of metal layers secured to a paper layer.

The aerosol-generating article of any of examples EX2 to EX5, wherein the metal layer has a thickness of greater than or equal to 2 nanometers.

The aerosol-generating article of any of examples EX2 to EX6, wherein the metal layer has a thickness of less than 100 nanometers.

The aerosol-generating article of any of examples EX2 to EX6, wherein the metal layer has a thickness between 10 nanometers and 60 nanometers.

Ex8. the aerosol-generating article of any of examples EX1 to EX7, wherein the metal layer comprises aluminum.

The aerosol-generating article of any of examples EX2 to EX8, wherein the paper layer has a thickness of greater than or equal to 10 microns.

Ex10 the aerosol-generating article of any of examples EX2 to EX9, wherein the paper layer has a thickness of less than 120 microns.

Ex11 the aerosol-generating article of any of examples EX2 to EX10, wherein the paper layer has a thickness of between 40 microns and 80 microns.

Ex12 an aerosol-generating article according to any of examples EX1 to EX11, wherein the wrapper is wrapped around the entire length of the aerosol-forming substrate.

Ex13. an aerosol-generating article according to any of examples EX1 to EX12 comprising an upstream element located upstream of the aerosol-forming substrate.

EX14 the aerosol-generating article of example EX13, wherein the upstream element comprises an annular rod.

Ex15 the aerosol-generating article of example EX13 or example EX14, wherein the wrapper is wrapped around at least a portion of the upstream element.

EX16 the aerosol-generating article according to example EX15, wherein the wrapper covers the entire length of the upstream element.

Ex17 an aerosol-generating article according to any of examples EX1 to EX16 comprising a hollow tubular section downstream of the aerosol-forming substrate.

Ex18 the aerosol-generating article of example EX17, wherein the hollow tubular segment is a cellulose acetate tube.

Ex19 the aerosol-generating article of example EX17 or example EX18, wherein the wrapper is wrapped around at least a portion of the hollow tubular segment.

The aerosol-generating article of any of examples EX1 to EX19, wherein the aerosol-forming substrate has an aerosol-former content of greater than or equal to 50 wt%.

The aerosol-generating article according to any of examples EX1 to EX20, wherein the aerosol-forming substrate has an aerosol-former content of greater than or equal to 60 wt%.

The aerosol-generating article according to any of examples EX1 to EX21, wherein the aerosol-forming substrate has an aerosol-former content of less than 90 wt%.

Ex22 the aerosol-generating article of any of examples EX1 to EX22, wherein the aerosol-forming substrate has an aerosol-former content of less than 80 wt%.

The aerosol-generating article according to any of examples EX1 to EX22, wherein the aerosol-forming substrate has an aerosol-former content of between 40 wt% and 90 wt%.

The aerosol-generating article according to any of examples EX1 to EX23, wherein the aerosol-forming substrate has an aerosol-former content of between 50 wt% and 80 wt%.

The aerosol-generating article of any of examples EX1 to EX24, wherein the aerosol-forming substrate has an aerosol-former content of greater than or equal to 100 milligrams.

The aerosol-generating article of any of examples EX1 to EX25, wherein the aerosol-forming substrate has an aerosol-former content of greater than or equal to 200 milligrams.

The aerosol-generating article of any of examples EX1 to EX26, wherein the aerosol-forming substrate has an aerosol-former content of less than 400 milligrams.

The aerosol-generating article of any of examples EX1 to EX27, wherein the aerosol-forming substrate has an aerosol-former content of less than 300 milligrams.

Ex29 an aerosol-generating article according to any of examples EX1 to EX28, wherein the aerosol-forming substrate has an aerosol-former content of between 100 mg and 400 mg.

The aerosol-generating article according to any one of examples EX1 to EX29, wherein the aerosol-forming substrate has an aerosol-former content of between 200 mg and 300 mg.

Ex31 the aerosol-generating article of one of examples EX1 to EX30, wherein the aerosol-forming substrate has an aerosol former content of greater than or equal to 0.05 grams per cubic centimeter.

Ex32 the aerosol-generating article of one of examples EX1 to EX31, wherein the aerosol-forming substrate has an aerosol former content of greater than or equal to 0.1 grams per cubic centimeter.

Ex33 the aerosol-generating article according to one of examples EX1 to EX32, wherein the aerosol-forming substrate has an aerosol former content of less than 0.3 g/cc.

The aerosol-generating article according to one of examples EX1 to EX33, wherein the aerosol-forming substrate has an aerosol former content of less than 0.25 g/cc.

Ex35 the aerosol-generating article according to one of examples EX1 to EX34, wherein the aerosol-forming substrate has an aerosol former content of between 0.05 g/cc and 0.3 g/cc.

The aerosol-generating article according to one of examples EX1 to EX35, wherein the aerosol-forming substrate has an aerosol former content of between 0.1 g/cc and 0.25 g/cc.

Ex37 the aerosol-generating article of one of examples EX1 to EX36, wherein the one or more aerosol-forming agents comprises one or more of glycerol and propylene glycol.

Ex38 the aerosol-generating article according to one of examples EX1 to EX37, wherein the aerosol-forming substrate has a moisture content of greater than or equal to 10 wt% as measured according to the method defined in the specification.

Ex39 the aerosol-generating article according to one of examples EX1 to EX38, wherein the aerosol-forming substrate has a moisture content of greater than or equal to 15 wt% as measured according to the method defined in the specification.

Ex40 an aerosol-generating article according to one of examples EX1 to EX39, wherein the aerosol-forming substrate has a moisture content of less than 30 wt% as measured according to the method defined in the specification.

Ex41 an aerosol-generating article according to one of examples EX1 to EX40, wherein the aerosol-forming substrate has a moisture content of less than 25 wt% as measured according to the method defined in the specification.

Ex42 an aerosol-generating article according to one of examples EX1 to EX41, wherein the aerosol-forming substrate has a moisture content of between 10 wt% and 30 wt%, as measured according to the method defined in the specification.

Ex43 the aerosol-generating article according to one of examples EX1 to EX42, wherein the aerosol-forming substrate has a moisture content of between 15 wt% and 25 wt%, as measured according to the method defined in the specification.

Ex44 the aerosol-generating article according to one of examples EX1 to EX43, wherein the aerosol-generating article has a length of less than 100 millimeters.

Ex45 the aerosol-generating article according to one of examples EX1 to EX44, wherein the aerosol-generating article has a length of less than 80 millimeters.

Ex46 the aerosol-generating article according to one of examples EX1 to EX45, wherein the aerosol-generating article has a length of between 38 mm and 70 mm.

Ex47 the aerosol-generating article according to one of examples EX1 to EX46, wherein the aerosol-generating article has a length of between 42 mm and 50 mm.

Ex48 an aerosol-generating article according to one of examples EX1 to EX47 comprising an outermost wrapper wrapped around at least the aerosol-forming substrate and the wrapper.

Ex49 an aerosol-generating article according to one of examples EX1 to EX48, the aerosol-generating article comprising a susceptor element.

Ex50 an aerosol-generating article according to example EX49, wherein the susceptor element extends the entire length of the aerosol-forming substrate.

Ex51 the aerosol-generating article according to example EX49 or example EX50, wherein the susceptor element is in the form of a strip.

An aerosol-generating article according to any of examples EX49 to EX51, wherein the susceptor element has a diameter of less than 5 mm.

An aerosol-generating article according to any of examples EX49 to EX52, wherein the susceptor element has a diameter of less than 4 mm.

The aerosol-generating article according to any one of examples EX49 to EX53, wherein the susceptor element has a diameter of greater than or equal to 1 millimeter.

Ex55 the aerosol-generating article of any one of examples EX49 to EX54, wherein the susceptor element has a diameter greater than or equal to 2 millimeters.

Ex56 an aerosol-generating article according to any of examples EX49 to EX55, wherein the susceptor element has a diameter of between 1 mm and 5 mm.

Ex57 an aerosol-generating article according to any of examples EX49 to EX56, wherein the susceptor element has a diameter of between 2 mm and 4 mm.

An aerosol-generating article according to any of examples EX49 to EX57, wherein the ratio of the thickness of the susceptor element to the thickness of the metal layer is less than 2500.

An aerosol-generating article according to any of examples EX49 to EX58, wherein the ratio of the thickness of the susceptor element to the thickness of the metal layer is greater than or equal to 1500.

Ex60. an aerosol-generating article according to any of examples EX49 to EX59, wherein the ratio of the thickness of the susceptor element to the thickness of the metal layer is between 1500 and 2500.

The aerosol-generating article of any of examples EX49 to EX60, wherein the aerosol-forming substrate has a bulk density of greater than or equal to 100 mg/cc.

An aerosol-generating article according to any of examples EX49 to EX61, wherein the aerosol-forming substrate has a bulk density of less than 2000 mg/cc.

Ex63 an aerosol-generating article according to any of examples EX49 to EX62, wherein the aerosol-forming substrate has a bulk density of between 100 mg/cc and 2000 mg/cc.

Ex64 an aerosol-generating article according to any of examples EX1 to EX63 comprising a mouthpiece element.

Ex65 the aerosol-generating article of example EX64, wherein the wrapper is wrapped around at least a portion of the mouthpiece element.

Ex66 an aerosol-generating article according to any of examples EX1 to EX65 comprising a second hollow tubular section downstream of the aerosol-forming substrate.

Ex67 the aerosol-generating article of example EX66, wherein the second hollow tubular segment is a cardboard tube.

Ex68 the aerosol-generating article of example EX66 or example EX67, wherein the wrapper wraps around at least a portion of the second hollow tubular segment.

The invention will be further described with reference to the drawings shown in the accompanying drawings in which:

fig. 1 shows a schematic side cross-sectional view of an aerosol-generating article according to the invention;

fig. 2 shows a schematic side cross-sectional view of another aerosol-generating article according to the invention;

fig. 3 shows a schematic side cross-sectional view of another aerosol-generating article according to the invention;

fig. 4 shows a schematic side cross-sectional view of another aerosol-generating article according to the invention;

fig. 5 shows a schematic side cross-sectional view of another aerosol-generating article according to the invention; and is also provided with

Fig. 6 shows a schematic side cross-sectional view of another aerosol-generating article according to the invention.

The aerosol-forming substrate is typically held within a rod of porous material. It has been found that in some cases, certain amounts of one or more aerosol-forming substrate components, such as glycerin or nicotine, may leak out of the rod and migrate to other parts of the aerosol-generating article. Migration of the aerosol-forming substrate away from the wand may reduce the amount of aerosol-forming substrate that can be vaporised and then inhaled by the user.

Thus, migration of components of the aerosol-forming substrate away from the rod may have a negative impact on the user experience provided by the aerosol-generating article. For example, migration of nicotine from an aerosol-forming substrate may reduce the amount of nicotine that can be inhaled by a user.

Migration of components of the aerosol-forming substrate away from the rod 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 greater than 40% by weight. This may be because an increase in the proportion of glycerol in the aerosol-forming substrate provides a more fluid aerosol-forming substrate that is more prone to leakage.

One known solution is to encapsulate an aerosol-generating article in a hydrophobic paper. However, the inventors have found that when using hydrophobic paper, some of the aerosol-forming agent in the aerosol-forming substrate may migrate into the paper during the manufacture of the aerosol-generating article. This may wet or soften the hydrophobic paper, which may make the aerosol-generating article difficult to handle, or may cause the aerosol-generating article to become stuck in a machine for manufacturing the aerosol-generating article.

It is desirable to provide an aerosol-generating article having a reduced likelihood of components of the aerosol-forming substrate migrating from the aerosol-forming substrate to another portion of the aerosol-generating article.

Fig. 1 shows an example of an aerosol-generating article 10.

The aerosol-generating article 100 comprises a rod 12 of aerosol-forming substrate. In this example, the strip 12 of aerosol-forming substrate is formed by crimping a portion of cast leaf tobacco sheet.

The aerosol-generating article 100 further comprises a downstream section 14 and an upstream section 16. The downstream section 14 is at a location downstream of the strip 12 of aerosol-forming substrate. The upstream section 16 is at a location upstream of the strip 12 of aerosol-forming substrate. In this example, the aerosol-generating article 100 extends from an upstream end (or distal end) 18 to a downstream end (or mouth end) 20.

In the example shown in fig. 1, the aerosol-generating article 100 has an overall length of about 45 millimeters.

The downstream section 14 includes a support element 22 positioned immediately downstream of the strip 12 of aerosol-forming substrate. The support member 22 is longitudinally aligned with the strip 12 of aerosol-forming substrate.

In the example shown in fig. 1, the upstream end of the support element 22 abuts the downstream end of the strip 12 of aerosol-forming substrate.

The downstream section 14 includes an aerosol-cooling element 24. The aerosol-cooling element 24 is positioned immediately downstream of the support element 22. The aerosol-cooling element 24 is longitudinally aligned with the strip 12 of aerosol-forming substrate and the support element 22. In the example shown in fig. 1, the upstream end of the aerosol-cooling element 24 abuts the downstream end of the support element 22.

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

The support element 22 comprises a first hollow tubular section 26. In the example of fig. 1, the first hollow tubular section 26 is provided in the form of a hollow cylindrical tube made of cellulose acetate. The first hollow tubular section 26 defines an inner lumen 28 extending from an upstream end 30 of the first hollow tubular section 26 up to a downstream end 32 of the first hollow tubular section 26. The lumen 28 is substantially empty and thus a substantially non-limiting flow of air is achieved along the lumen 28.

In the example shown in fig. 1, the first hollow tubular section 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 thickness of the peripheral wall of the first hollow tubular section 26 is about 2.67 millimeters.

The aerosol-cooling element 24 comprises a second hollow tubular section 34. In the example of fig. 1, the second hollow tubular section 34 is provided in the form of a hollow cylindrical tube made of cellulose acetate. The second hollow tubular section 34 defines an inner lumen 36 extending from an upstream end 38 of the second hollow tubular section up to a downstream end 40 of the second hollow tubular section 34. The interior cavity 36 is substantially empty and thus a substantially non-limiting flow of air is achieved along the interior cavity 36.

In the example shown in fig. 1, the second hollow tubular section 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 thickness of the peripheral wall of the second hollow tubular section 34 is about 2 millimeters. Thus, the ratio between the inner diameter of the first hollow tubular section 26 and the inner diameter of the second hollow tubular section 34 is about 0.75.

The aerosol-generating article 100 has a ventilation zone 60 provided at a location along the second hollow tubular section 34. In the example of fig. 1, the ventilation zone 60 is provided at about 2 millimeters from the upstream end of the second hollow tubular section 34. The ventilation level of the aerosol-generating article 100 is about 25%.

The downstream section 14 includes a mouthpiece element 42 at a location 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 diagram of fig. 1, the upstream end of the mouthpiece element 42 abuts the downstream end 40 of the aerosol-cooling element 18.

In the example of fig. 1, the mouthpiece element 42 is provided in the form of a cylindrical rod of low density cellulose acetate. The mouthpiece element 42 has a length of about 12 mm and an outer diameter of about 7.25 mm.

In the example of fig. 1, the strip 12 of aerosol-forming substrate has an outer diameter of about 7.25 mm and a length of about 12 mm.

The aerosol-generating article 100 comprises an elongate susceptor element 44 within a strip 12 of aerosol-forming substrate. The susceptor element 44 is arranged substantially longitudinally within the aerosol-generating substrate so as to be substantially parallel to the longitudinal direction of the strip 12 of aerosol-forming substrate. The susceptor element 44 is positioned in a radially central position within the strip 12 and effectively extends along the longitudinal axis of the strip 12.

The susceptor element 44 extends from the upstream end to the downstream end of the strip 12 of aerosol-forming substrate. In practice, the susceptor element 44 has substantially the same length as the strip 12 of aerosol-forming substrate.

In the example of fig. 1, the susceptor element 44 is provided in the form of a strip and has a length of about 12 mm, a thickness of about 60 microns and a width of about 4 mm.

The upstream section 16 includes an upstream element 46. The upstream element 46 is positioned immediately upstream of the strip 12 of aerosol-forming substrate. The upstream element 46 is longitudinally aligned with the strip 12.

The downstream end of the upstream element 46 abuts the upstream end of the strip 12 of aerosol-forming substrate. Advantageously, this may prevent the susceptor element 44 from being removed. Furthermore, this ensures that the user does not accidentally touch the heated susceptor element 44 after use.

In the example of fig. 1, the upstream element 46 is provided in the form of a cylindrical rod of cellulose acetate. The upstream element 46 has a length of about 5 mm.

The aerosol-generating article 100 comprises a wrapper 70. The wrapper 70 is wrapped around the strip 12 of aerosol-forming substrate. Wrapper 70 comprises a metal layer. In the example of fig. 1, the metal is aluminum. In the example of fig. 1, the wrapper 70 also includes a paper layer. In one example, a metal layer is deposited on the paper layer. For example, the metal layer may be deposited on the paper layer by using vapor deposition. In another example, the metal layer is fixed to the paper layer. For example, the metal layer and the paper layer may be bonded together to form a laminate.

In the example of fig. 1, the metal layer has a thickness of 40 nanometers and the paper layer has a thickness of 60 microns.

In some examples, the wrapper 70 wraps around the entire circumferential surface area of the strip 12 of aerosol-forming substrate.

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

The aerosol-generating article 100 comprises an outermost wrapper 80. In the example of fig. 1, the outermost wrapper 80 is wrapped around all components of the aerosol-generating article 10. The outermost wrapper 80 is also wrapped around the wrapper 70.

Fig. 2, 3, 4, 5 and 6 show alternative examples to the example shown in fig. 1. The aerosol-generating article 200 of fig. 2, the aerosol-generating article 300 of fig. 3, the aerosol-generating article 400 of fig. 4, the aerosol-generating article 500 of fig. 5 and the aerosol-generating article 600 of fig. 6 are identical to the aerosol-generating article 100 of fig. 1, except for the following differences.

In the example shown in fig. 2, the wrapper 70 wraps around both the strip 12 of aerosol-forming substrate and the upstream element 46. In contrast, in the example shown in fig. 1, the wrapper 70 is wrapped around only the strip 12 of aerosol-forming substrate.

In the example of fig. 2, the wrapper 70 wraps around the entire length of the upstream element 46. However, in some examples, the wrapper 70 may wrap around only a portion of the length of the upstream element 46.

In the example of fig. 2, upstream element 46 is pre-wrapped with a paper element wrapper (not shown) that is positioned below wrapper 70.

In the example shown in fig. 3, the wrapper 70 wraps around both the strip 12 of aerosol-forming substrate and the first hollow tubular section 26. In contrast, in the example shown in fig. 1, the wrapper 70 is wrapped around only the strip 12 of aerosol-forming substrate.

In the example of fig. 3, the wrapper 70 wraps around the entire length of the first hollow tubular section 26. However, in some examples, the wrapper 70 may wrap around only a portion of the length of the first hollow tubular section 26.

In the example shown in fig. 4, the wrapper 70 wraps around the entire length of the upstream element 46, the strip 12 of aerosol-forming substrate and the first hollow tubular section 26. In contrast, in the example shown in fig. 1, the wrapper 70 is wrapped around only the strip 12 of aerosol-forming substrate.

In the example of fig. 4, the wrapper 70 wraps around the entire length of the first hollow tubular section 26. However, in some examples, the wrapper 70 may wrap around only a portion of the length of the first hollow tubular section 26.

In the example shown in fig. 5, the wrapper 70 wraps around the entire length of the upstream element 46, the strip 12 of aerosol-forming substrate, the first hollow tubular section 26 and the second hollow tubular section 34. In contrast, in the example shown in fig. 1, the wrapper 70 is wrapped around only the strip 12 of aerosol-forming substrate.

In the example of fig. 5, wrapper 70 wraps around the entire length of the first hollow tubular section 26 and the entire length of the second hollow tubular section 34. However, in some examples, the wrapper 70 may wrap around only a portion of the length of the first hollow tubular section 26 and/or a portion of the length of the second hollow tubular section 34.

In the example shown in fig. 6, the wrapper 70 wraps around the entire length of all elements of the aerosol-generating article 600. In other words, in the example of fig. 6, the wrapper 70 wraps around the upstream element 46, the strip 12 of aerosol-forming substrate, the first hollow tubular section 26, the second hollow tubular section 34, and the mouthpiece element 42. In contrast, in the example shown in fig. 1, the wrapper 70 is wrapped around only the strip 12 of aerosol-forming substrate.

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

TABLE 1

The moisture content of example A was 20% by weight. In this example, the moisture content includes all glycerol content and water content of the formulation.

The moisture content of the aerosol-forming substrate was measured according to the following method:

1. adapting an aerosol-forming substrate using a forced air flow at a temperature of 22 ℃, a humidity of 50% relative humidity and a pressure of 100 kPa;

2. stopping the adaptation when the weight of the aerosol-forming substrate no longer varies by more than 0.2% of the total weight over a period of three hours; and is also provided with

3. The aerosol-forming substrate was subjected to Karl Fischer (Karl Fischer) titration method:

a. Extracting moisture by shaking the aerosol-forming substrate with dry methanol;

b. injecting an aliquot of the aerosol-forming substrate into a titration vessel;

c. titrating the aliquot of the aerosol-forming substrate with a pyridine-free karl fischer reagent; and is also provided with

d. The moisture content was calculated using the following equation:

wt=moisture content (%)

Vt = volume of reagent used to titrate sample extract [ ml ]

B = blank value

Va = volume of an aliquot of titrated sample [ ml ]

E = water equivalent [ mgH ] ₂ O/ml]

V = total volume of sample extract prepared [ ml ]

M = mass of test parts [ mg ]

From this method a moisture content in weight% of the aerosol-forming substrate can be obtained.

TABLE 2

Providing a wrapper 70 wrapped around the strip 12 of aerosol-forming substrate and comprising a metal layer may assist in containing one or more components of the aerosol-forming substrate within the strip 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 into other portions of the aerosol-generating article 100.

Table 2 shows the nicotine yields from strips 12 of the aerosol-forming substrate of example a in the aerosol-generating articles of examples 1 and 2.

The aerosol-generating article of example 1 is a typical aerosol-generating article that does not comprise 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 the aerosol-generating article 100 as described above and as shown in fig. 1.

As shown in table 2, when the aerosol-generating article 100 does not include a wrapper 70, the nicotine yield from the rod 12 of aerosol-forming substrate is 278 micrograms. However, when the aerosol-generating article 100 comprises the wrapper 70, the nicotine production from the strip 12 of aerosol-forming substrate increases by 66% to 461 micrograms.

Thus, providing a wrapper 70 wrapped around the strip 12 of aerosol-forming substrate and comprising a metal layer increases the nicotine production from the strip 12 of aerosol-forming substrate.

The increase in nicotine production is due to the fact that the metal layer of the wrapper may prevent or at least reduce migration of components of the aerosol-forming substrate, such as the aerosol-former, out of the strip 12 and into other parts of the aerosol-generating article 100. Thus, if more aerosol-forming substrate remains within the strip 12, it is possible to produce more nicotine from the aerosol-forming substrate.

An increase in nicotine production from the strips 12 of aerosol-forming substrate may result in an improvement in the user experience.

The particular embodiments described above illustrate but do not limit the invention. It is to be understood that there may be other embodiments of the invention and that the specific embodiments described herein are not exhaustive or exhaustive.

Claims

1. An aerosol-generating article, the aerosol-generating article comprising:

an aerosol-forming substrate comprising one or more aerosol-forming agents; and

the package is provided with a plurality of layers of material,

wherein the wrapper is wrapped around the aerosol-forming substrate,

wherein the wrapper comprises a metal layer, and

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

3. An aerosol-generating article according to claim 2, wherein the metal layer is radially inward of the paper layer.

4. An aerosol-generating article according to claim 2 or claim 3, wherein the wrapper comprises the metal layer deposited on the paper layer.

5. An aerosol-generating article according to any one of claims 2 to 4, wherein the metal layer has a thickness of greater than or equal to 2 nanometers.

6. An aerosol-generating article according to any preceding claim, wherein the wrapper is wrapped around the entire length of the aerosol-forming substrate.

7. An aerosol-generating article according to any preceding claim, wherein the aerosol-forming substrate has an aerosol-former content of greater than or equal to 50 wt%.

8. An aerosol-generating article according to any preceding claim, wherein the aerosol-forming substrate has an aerosol-former content of greater than or equal to 60 wt%.

9. An aerosol-generating article according to any preceding claim, wherein the aerosol-forming substrate has an aerosol-former content of between 40% and 90% by weight.

10. An aerosol-generating article according to any preceding claim, wherein the aerosol-forming substrate has an aerosol-former content of between 50% and 80% by weight.

11. An aerosol-generating article according to any preceding claim, wherein the aerosol-forming substrate has an aerosol former content of greater than or equal to 100 mg.

12. An aerosol-generating article according to any preceding claim, wherein the one or more aerosol-forming agents comprise one or more of glycerol and propylene glycol.

13. An aerosol-generating article according to any preceding claim, wherein the aerosol-forming substrate has a moisture content of greater than or equal to 10 wt% as measured according to the method defined in the specification.

14. An aerosol-generating article according to any preceding claim comprising an outermost wrapper wrapped around at least the aerosol-forming substrate and the wrapper.

15. An aerosol-generating article according to any preceding claim, comprising a susceptor element.