KR20230082645A - Aerosol-generating system with low resistance to draw and improved flavor delivery - Google Patents

Abstract

An aerosol-generating system (1000) is provided comprising an aerosol-generating article (10) for generating an inhalable aerosol upon heating and an aerosol-generating device (1) having a distal end and a mouth end (2). The aerosol-generating article 10 extends from the mouth end 18 to the distal end 16 . The aerosol-generating article 10 includes an aerosol-generating element 12 . The aerosol-generating article 10 includes a downstream section 14 located downstream of the aerosol-forming element 12 . The downstream section 14 extends from the downstream end of the aerosol-forming element 12 to the mouth end 18 of the aerosol-generating article 10 . The downstream section 14 comprises a hollow tubular element 20 . The resistance to draw of the downstream section 14 is less than about 10 mmH ₂ O. The aerosol-generating device 1 comprises a body 4 . The body 4 of the aerosol-generating device 1 defines a device cavity for detachably receiving an aerosol-generating article 10 at the mouth end 2 of the device 1 . The aerosol-generating device 1 comprises a heater for heating the aerosol-generating element 12 when the aerosol-generating article 1 is received within the device cavity.

Description

Aerosol-generating system with low resistance to draw and improved flavor delivery

The present invention relates to an aerosol-generating system comprising an aerosol-generating device and an aerosol-generating article. The present disclosure also relates to an aerosol-generating article comprising an aerosol-generating element and configured to generate an inhalable aerosol upon heating.

Aerosol-generating articles in which an aerosol-generating substrate, such as a tobacco-containing substrate, is heated without burning are known in the art. Typically, in such heated smoking articles, the aerosol is generated by heat transfer from the heat source to an aerosol-generating substrate or material that is physically separate, such substrate or material being placed in contact with the heat source, positioned within the heat source, or It may be located around the heat source or downstream of the heat source. During use of the aerosol-generating article, volatile compounds are released from the aerosol-generating substrate by heat transfer from a heat source and are entrained in the air drawn through the aerosol-generating article. As the released compound cools, it condenses to form an aerosol.

A number of prior art documents disclose aerosol-generating devices for consuming aerosol-generating articles. Such devices include, for example, electrically heated aerosol-generating devices in which an aerosol is generated by heat transfer from one or more electric heater elements of the aerosol-generating device to an aerosol-generating substrate of a heated aerosol-generating article. For example, electrically heated aerosol-generating devices have been proposed that include internal heater blades adapted to be inserted within an aerosol-generating substrate. As an alternative, an inductively heatable aerosol-generating article comprising an aerosol-generating substrate and a susceptor arranged within the aerosol-generating substrate has been proposed by WO 2015/176898. A further alternative is described in WO 2020/115151, which discloses an aerosol-generating article used in combination with an external heating system comprising one or more heating elements arranged around the periphery of the aerosol-generating article.

Aerosol-generating articles in which the tobacco-containing substrate is heated rather than combusted presents a number of problems not encountered in conventional smoking articles. First, the tobacco-containing substrate is typically heated to a significantly lower temperature compared to the temperature reached by the combustion front in a conventional cigarette. This can affect nicotine release from the tobacco-containing substrate and delivery of nicotine to the consumer. At the same time, if the heating temperature is increased in an attempt to promote nicotine delivery, then the generated aerosol typically needs to be cooled to a greater extent and more quickly before reaching the consumer. However, technical solutions commonly used to cool mainstream smoke in conventional smoking articles, such as providing a high filtration efficiency segment at the mouth end of the cigarette, rather than burning because the tobacco-containing substrate can reduce nicotine delivery. It can have undesirable effects in heated aerosol-generating articles.

To address one or more problems specifically associated with heating rather than burning the aerosol-generating substrate, a number of aerosol-generating articles have been proposed wherein a number of elements, for example in longitudinal alignment, contain aerosol-containing aerosol-generating substrates. combined with the occurrence factor. By way of example, aerosol-generating elements have been combined with support elements to impart improved structural strength to the article, aerosol-cooling elements adapted to lower the temperature of the aerosol, low-filtration mouthpiece elements, and the like.

There is also a generally felt need for aerosol-generating articles that are easy to use, have improved practicality, and are more environmentally friendly. It would also be desirable to provide an aerosol-generating article that is easy to manufacture and would make the entire manufacturing chain more sustainable and cost effective. There is also a need for an aerosol-generating article particularly suitable for use in combination with an external heating system, particularly an aerosol-generating article having improved aerosol generation and aerosol former delivery.

Accordingly, it would be desirable to provide a new improved aerosol-generating article that is tailored to achieve at least one of the aforementioned needs. It would also be desirable to provide one such aerosol-generating article that can be manufactured efficiently and at high speed, preferably with satisfactory and low RTD variability from one article to another.

As discussed above, the present disclosure relates to aerosol-generating systems. An aerosol-generating system may include an aerosol-generating article according to the present disclosure. The aerosol-generating article may be suitable for generating an inhalable aerosol upon heating. The aerosol-generating system may further include an aerosol-generating device having a distal end and a mouth end. The aerosol-generating article may extend from the mouth end to the distal end. An aerosol-generating article may include an aerosol-generating element. The aerosol-generating article may include a downstream section located downstream of the aerosol-generating element. The downstream section may extend from the downstream end of the aerosol-generating element to the mouth end of the aerosol-generating article. The downstream section may include a hollow tubular element. The resistance to draw of the downstream section may be less than about 10 mmH ₂ O. The aerosol-generating device may include a body. The aerosol-generating device, or body of the aerosol-generating device, may define a device cavity for removably receiving an aerosol-generating article at the mouth end of the device. The aerosol-generating device may include a heater for heating the aerosol-generating element when an aerosol-generating article is received within the device cavity. The aerosol-generating element may include an aerosol-generating substrate.

According to the present invention there is provided an aerosol-generating system comprising an aerosol-generating article for generating an inhalable aerosol upon heating and an aerosol-generating device having a distal end and a mouth end. The aerosol-generating article extends from the mouth end to the distal end. An aerosol-generating article includes an aerosol-generating element. The aerosol-generating article includes a downstream section located downstream of the aerosol-generating element. The downstream section extends from the downstream end of the aerosol-generating element to the mouth end of the aerosol-generating article. The downstream section contains hollow tubular elements. The resistance to draw of the downstream section is less than about 10 mmH ₂ O. The aerosol-generating device includes a body. The body of the aerosol-generating device defines a device cavity for removably receiving an aerosol-generating article at the mouth end of the device. The aerosol-generating device includes a heater for heating the aerosol-generating element when an aerosol-generating article is received within the device cavity.

Accordingly, an aerosol-generating system according to the present invention provides a novel device comprising an aerosol-generating article having a downstream section of an aerosol-generating element, characterized in that it has an RTD of less than 10 mmH ₂ O.

Provision of a downstream section having such a low RTD has the effect that substantially all of the RTD of the aerosol-generating article is provided by the aerosol-generating element itself and, if present, can be provided by a section upstream of the aerosol-generating element. . The inventors have discovered that an aerosol-generating article having such an RTD distribution along the length of the article is advantageously possible to optimize the delivery of aerosol to the consumer, especially when the article is used in combination with the aerosol-generating device of the present system. .

This is desirable because it simplifies the construction and operation of both the aerosol-generating article and the heating device. It has also been found that this allows the substrate to be heated to a lower temperature without compromising the quality and quantity of the aerosol delivered to the consumer.

Further, since the provision of such a low RTD downstream of the aerosol-generating rod can be achieved by providing a hollow tubular element downstream of the aerosol-generating rod, a substantially empty volume is provided within the article, wherein aerosol particle nucleation and As growth takes precedence, RTD is substantially eliminated. This may further contribute to improving aerosol generation and delivery compared to existing aerosol-generating articles and systems, thereby improving the overall experience of the consumer.

The provision of a downstream section having such a low RTD is such that substantially all of the RTD of the aerosol-generating article is provided by the aerosol-generating element itself (eg, by a rod-shaped aerosol-generating element) and optionally an element located upstream of the aerosol-generating element. has the effect provided by The inventors have found that an aerosol-generating article having such an RTD distribution along the length of the article is advantageously possible to optimize the delivery of the aerosol to the consumer, particularly when the article is used in combination with an external heating system or heater. Aerosol delivery can be influenced to some extent by the RTD of the aerosol-generating element itself. This is because the aerosol generated in the upstream portion of the aerosol-generating element first needs to flow through the remaining downstream portion of the aerosol-generating element. Thus, controlling the geometry of the aerosol-generating element also allows for more effective control of aerosol delivery, and generally aerosol delivery is more consistent from one aerosol-generating article to another, particularly when used in combination with an external heating system or heater. .

According to the present disclosure, an aerosol-generating article is provided for generating an inhalable aerosol upon heating. Aerosol-generating articles include elements that include an aerosol-generating substrate.

The term “aerosol-generating article” is used herein to refer to an article in which an aerosol-generating substrate is heated and generates an inhalable aerosol that is delivered to a consumer. As used herein, the term "aerosol-generating substrate" refers to a substrate capable of releasing volatile compounds to generate an aerosol when heated.

Conventional cigarettes are lit when a user applies a flame to one end of the cigarette and draws air through the other end. The local heat provided by the flame and the oxygen in the air drawn through the cigarette causes the end of the cigarette to ignite, and the resulting combustion produces inhalable smoke. In contrast, in heated aerosol-generating articles, an aerosol is generated by heating a flavor generating substrate such as tobacco. Known heated aerosol-generating articles include, for example, electrically heated aerosol-generating articles and aerosol-generating articles in which an aerosol is generated by heat transfer to an aerosol-forming material physically separated from a combustible fuel element or heat source. For example, aerosol-generating articles according to the present invention find particular application in aerosol-generating systems comprising electrically heated aerosol-generating devices having internal heater blades adapted to be inserted within a rod of an aerosol-generating substrate. Aerosol-generating articles of this type are described in the prior art, for example EP 0822670.

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

The aerosol-generating element may be in the form of a rod comprising or made of an aerosol-generating substrate. As used herein in connection with the present disclosure, the term “rod” is used to denote a generally cylindrical element of substantially circular, ovoid or elliptical cross-section.

As used herein, the term “longitudinal axis” refers to the direction corresponding to the major longitudinal axis of the aerosol-generating article that extends between the upstream and downstream ends of the aerosol-generating article. As used herein, the terms "upstream" and "downstream" describe the relative position of an element, or portion of an element, of an aerosol-generating article with respect to the direction in which an aerosol is transported through the aerosol-generating article during use.

During use, air is drawn longitudinally through the aerosol-generating article. The term “transverse direction” refers to a direction perpendicular to the longitudinal axis. Any reference to a "cross-section" of an aerosol-generating article or component of an aerosol-generating article refers to a cross-section unless stated otherwise.

The term "length" refers to the dimension of a component of an aerosol-generating article in the longitudinal direction. For example, it can be used to indicate the dimensions of a rod or elongated tubular element in the longitudinal direction.

The aerosol-generating article may further include a downstream section at a location downstream of the rod of the aerosol-generating substrate. As will be apparent from the following description of different embodiments of the aerosol-generating article of the present invention, the downstream section may include one or more downstream elements.

In some embodiments, the downstream section may include a hollow section between the mouth end of the aerosol-generating article and the aerosol-generating element. The hollow section may comprise a hollow tubular element.

As used herein, the term “hollow segment” is used to refer to a generally elongated element defining a lumen or airflow passage along its longitudinal axis. In particular, the term “tubular” will be used hereinafter with reference to a tubular element defining at least one airflow conduit having a substantially cylindrical cross-section and establishing unimpeded fluid communication between an upstream end of the tubular element and a downstream end of the tubular element. will be. However, it will be appreciated that alternative geometries (eg, alternative cross-sectional shapes) of the tubular element may be possible.

In the context of this disclosure, a hollow tubular element or segment provides an unrestricted flow channel. This means that the hollow tubular segments provide negligible resistance to draw (RTD). The term "negligible RTD" means less than 1 mm H ₂ O per 10 mm length of hollow tubular element, preferably less than 0.4 mm H 2 O per 10 mm length of hollow tubular element, more preferably less than 0.4 mm H ₂ O per 10 mm length of hollow tubular element. Used to describe an RTD of less than 0.1 mm H ₂ O per 10 mm length.

Accordingly, the flow channels should be free of any components that would impede the flow of air in the longitudinal direction. Preferably, the flow channel is substantially empty.

In some embodiments, the aerosol-generating article may include a ventilation zone at a location along the downstream section. In some embodiments, the aerosol-generating article may include a ventilation zone at a location along the hollow tubular element. In this way, fluid communication is established between the external environment and the flow channel internally defined by the hollow tubular element.

The aerosol-generating article may further include an upstream section at a location upstream of the rod of the aerosol-generating substrate. An upstream section may include one or more upstream elements. In some embodiments, the upstream section may include an upstream element arranged immediately upstream of the aerosol-generating element.

As briefly described above, aerosol-generating articles according to the present disclosure include an aerosol-generating element comprising an aerosol-generating substrate.

In some embodiments, the aerosol-generating element may be provided in the form of a rod comprising an aerosol-generating substrate. As an example, an aerosol-generating element may comprise a rod of aerosol-generating substrate surrounded by a wrapper.

The rod comprising the aerosol-generating substrate may have a length of at least about 5 mm. Preferably, the rod comprising the aerosol-generating substrate has a length of at least about 7 mm. More desirably, the rod comprising the aerosol-generating substrate may have a length of at least about 10 mm. In a particularly preferred embodiment, the rod comprising the aerosol-generating substrate has a length of at least about 12 mm.

The rod containing the aerosol-generating substrate may have a length of up to about 80 mm. Preferably, the rod comprising the aerosol-generating substrate has a length of at least about 65 mm or less. More preferably, the rod comprising the aerosol-generating substrate has a length of about 60 mm or less. Even more preferably, the rod comprising the aerosol-generating substrate has a length of about 55 mm or less.

In a particularly preferred embodiment, the rod comprising the aerosol-generating substrate has a length of about 50 mm or less, more preferably about 35 mm or less, and even more preferably about 25 mm or less. In a particularly preferred embodiment, the rod comprising the aerosol-generating substrate has a length of about 20 mm or less or even about 15 mm or less.

In some embodiments, the rod comprising the aerosol-generating substrate is about 5 mm to about 60 mm, preferably about 6 mm to about 60 mm, more preferably about 7 mm to about 60 mm, even more preferably about 10 mm. mm to about 60 mm, most preferably about 12 mm to about 60 mm. In another embodiment, the rod comprising the aerosol-generating substrate is about 5 mm to about 55 mm, preferably about 6 mm to about 55 mm, more preferably about 7 mm to about 55 mm, even more preferably about 10 mm. mm to about 55 mm, most preferably about 12 mm to about 55 mm. In a further embodiment, the rod comprising the aerosol-generating substrate is about 5 mm to about 50 mm, preferably about 6 mm to about 50 mm, more preferably about 7 mm to about 50 mm, even more preferably about 10 mm. mm to about 50 mm, most preferably about 12 mm to about 50 mm.

In some particularly preferred embodiments, the rod comprising the aerosol-generating substrate is about 5 mm to about 30 mm, preferably about 6 mm to about 30 mm, more preferably about 7 mm to about 30 mm, even more preferably It has a length of about 10 mm to about 30 mm. In another particularly preferred embodiment, the rod comprising the aerosol-generating substrate is about 5 mm to about 20 mm, preferably about 6 mm to about 20 mm, more preferably about 7 mm to about 20 mm, even more preferably It has a length of about 10 mm to about 20 mm. In a further particularly preferred embodiment, the rod comprising the aerosol-generating substrate is about 5 mm to about 15 mm, preferably about 7 mm to about 20 mm, more preferably about 9 mm to about 16 mm, even more preferably It has a length of about 10 mm to about 15 mm.

The rod comprising the aerosol-generating substrate preferably has an outer diameter substantially equal to the outer diameter of the aerosol-generating article.

Preferably, the rod comprising the aerosol-generating substrate has an outer diameter of at least about 5 mm. More preferably, the rod comprising the aerosol-generating substrate has an outer diameter of at least about 6 mm. Even more preferably, the rod comprising the aerosol-generating substrate has an outer diameter of at least about 7 mm.

The rod containing the aerosol-generating substrate has an outer diameter of about 12 mm or less. More preferably, the rod comprising the aerosol-generating substrate has an outer diameter of about 10 mm or less. Even more preferably, the rod comprising the aerosol-generating substrate has an outer diameter of about 8 mm or less.

In general, the smaller the diameter of the rod containing the aerosol-generating substrate, the lower the temperature required to raise the core temperature of the aerosol-generating element so that a sufficient amount of vaporizable species is released from the aerosol-generating substrate to form the desired amount of aerosol. Observed. At the same time, without wishing to be bound by theory, it is understood that a smaller diameter rod comprising an aerosol-generating substrate allows heat supplied to the aerosol-generating article to penetrate more rapidly into the overall volume of the aerosol-generating substrate. Nevertheless, if the diameter of the rod containing the aerosol-forming substrate is too small, the volume to surface ratio of the aerosol-forming substrate becomes unattractive as the amount of aerosol-forming substrate available decreases.

A rod diameter comprising an aerosol-generating substrate falling within the ranges described herein is particularly advantageous in terms of a balance between energy consumption and aerosol delivery. This advantage is particularly felt when an aerosol-generating article comprising a rod having a diameter as described herein and comprising an aerosol-generating substrate is used in combination with an external heater arranged around the periphery of the aerosol-generating article. Under these operating conditions, it has been observed that less thermal energy is required to achieve a sufficiently high temperature at the core of the rod comprising the aerosol-generating substrate, and generally at the core of the article. Thus, when operating at lower temperatures, the desired target temperature at the core of the aerosol-generating substrate can be achieved with low energy consumption within a desired reduction time frame.

In some embodiments, the rod comprising the aerosol-generating substrate has an outer diameter of about 5 mm to about 12 mm, preferably about 6 mm to about 12 mm, more preferably about 7 mm to about 12 mm. In another embodiment, the rod comprising the aerosol-generating substrate has an outer diameter of about 5 mm to about 12 mm, preferably about 6 mm to about 10 mm, more preferably about 7 mm to about 10 mm. In a further embodiment, the rod comprising the aerosol-generating substrate has an outer diameter of from about 5 mm to about 8 mm, preferably from about 6 mm to about 8 mm, more preferably from about 7 mm to about 8 mm.

In a particularly preferred embodiment, the rod comprising the aerosol-generating substrate has an outer diameter of less than about 7.5 mm. As an example, a rod comprising an aerosol-generating substrate may have an outer diameter of about 7.2 mm.

The length to diameter ratio of the aerosol-generating element may be at least about 0.5. Preferably, the length to diameter ratio of the aerosol-generating element is at least about 0.75. More preferably, the length to diameter ratio of the aerosol-generating element is at least about 1.0. Even more preferably, the length to diameter ratio of the aerosol-generating element is at least about 1.25.

The length to diameter ratio of the aerosol-generating element may be about 3.0 or less. Preferably, the length to diameter ratio of the aerosol-generating element is about 2.75 or less. Preferably, the length to diameter ratio of the aerosol-generating element is about 2.5 or less. Even more preferably, the length to diameter ratio of the aerosol-generating element is about 2.25 or less.

In some embodiments, the length to diameter ratio of the aerosol-generating element may be from about 0.5 to about 3.0. Preferably, the length to diameter ratio of the aerosol-generating element is from about 0.75 to about 3.0. More preferably, the length to diameter ratio of the aerosol-generating element is from about 1.0 to about 3.0. Even more preferably, the length to diameter ratio of the aerosol-generating element is from about 1.25 to about 3.0.

In other embodiments, the length to diameter ratio of the aerosol-generating element may be from about 0.5 to about 2.75. Preferably, the length to diameter ratio of the aerosol-generating element is from about 0.75 to about 2.75. More preferably, the length to diameter ratio of the aerosol-generating element is from about 1.0 to about 2.75. Even more preferably, the length to diameter ratio of the aerosol-generating element is from about 1.25 to about 2.75.

In further embodiments, the length to diameter ratio of the aerosol-generating element may be from about 0.5 to about 2.5. Preferably, the length to diameter ratio of the aerosol-generating element is from about 0.75 to about 2.5. More preferably, the length to diameter ratio of the aerosol-generating element is from about 1.0 to about 2.5. Even more preferably, the length to diameter ratio of the aerosol-generating element is from about 1.25 to about 2.5.

In further embodiments, the length to diameter ratio of the aerosol-generating element may be from about 0.5 to about 2.25. Preferably, the length to diameter ratio of the aerosol-generating element is from about 0.75 to about 2.25. More preferably, the length to diameter ratio of the aerosol-generating element is from about 1.0 to about 2.25. Even more preferably, the length to diameter ratio of the aerosol-generating element is from about 1.25 to about 2.25.

In particularly preferred embodiments, the length to diameter ratio of the aerosol-generating element may be at least about 1.3, more preferably about 1.4, and even more preferably about 1.5.

In particularly preferred embodiments, the length to diameter ratio of the aerosol-generating element may be less than or equal to about 2.0, more preferably less than or equal to about 1.9, and even less than or equal to about 1.8.

In some embodiments, the ratio of length to diameter of the aerosol-generating element is from about 1.3 to about 2.0, more preferably from about 1.4 to about 2.0, and even more preferably from about 1.5 to about 2.0. In another embodiment, the length to diameter ratio of the aerosol-generating element is from about 1.3 to about 1.9, more preferably from about 1.4 to about 1.9, even more preferably from about 1.5 to about 1.9. In a further embodiment, the ratio of length to diameter of the aerosol-generating element is from about 1.3 to about 1.8, more preferably from about 1.4 to about 1.8, even more preferably from about 1.5 to about 1.8.

The ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article may be at least about 0.10. Preferably, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is at least about 0.15. More preferably, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is at least about 0.20. Even more preferably, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is at least about 0.25.

Generally, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article may be about 0.60 or less. Preferably, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is about 0.50 or less. More preferably, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is about 0.45 or less. Even more preferably, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is about 0.40 or less. In particularly preferred embodiments, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is less than or equal to about 0.35, more preferably less than or equal to 0.30.

In some embodiments, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is preferably from about 0.10 to about 0.45, preferably from 0.15 to about 0.45, more preferably from about 0.20 to about 0.45, and even more. preferably from about 0.25 to about 0.45. In another embodiment, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is preferably from about 0.10 to about 0.40, preferably from 0.15 to about 0.40, more preferably from about 0.20 to about 0.40, and even more. preferably from about 0.25 to about 0.40. In a further embodiment, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is preferably from about 0.10 to about 0.35, preferably from about 0.15 to about 0.35, more preferably from about 0.20 to about 0.35, even more. preferably from about 0.25 to about 0.35. In a further embodiment, the ratio between the length of the aerosol-generating element and the overall length of the aerosol-generating article is preferably from about 0.10 to about 0.30, preferably from 0.15 to about 0.30, more preferably from about 0.20 to about 0.30, and even more. preferably from about 0.25 to about 0.30.

Preferably, the aerosol-generating element comprises a rod of aerosol-forming substrate having a substantially uniform cross-section along the length of the rod. Particularly preferably, the rod of the aerosol-generating substrate has a substantially circular cross-section.

As described in more detail below, an aerosol-generating article according to the present disclosure includes a downstream section that may include a hollow tubular element. In an aerosol-generating article according to the present disclosure, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element may be about 0.66 or less. Preferably, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element may be about 0.60 or less. More desirably, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element may be about 0.50 or less. Even more desirably, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element may be about 0.40 or less.

In aerosol-generating articles according to the present disclosure, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element may be at least about 0.10. Preferably, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element may be at least about 0.15. More desirably, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element may be at least about 0.20. Even more preferably, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element may be at least about 0.25. In particularly preferred embodiments, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element may be at least about 0.30.

In some embodiments, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element is from 0.15 to 0.60, preferably from about 0.20 to about 0.60, more preferably from about 0.25 to about 0.60, even more preferably from about 0.30 to about 0.60. In another embodiment, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element is from 0.15 to 0.50, preferably from about 0.20 to about 0.50, more preferably from about 0.25 to about 0.50, even more preferably from about 0.30 to about 0.50. In a further embodiment, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element is from 0.15 to 0.40, preferably from about 0.20 to about 0.40, more preferably from about 0.25 to about 0.40, even more preferably from about 0.30 to about 0.40. As an example, the ratio between the length of the aerosol-generating element and the length of the hollow tubular element may be about 0.35.

The density of the aerosol-generating substrate may be at least about 100 μg/cm3. Preferably, the density of the aerosol-generating substrate is at least about 115 μg/cm3. More preferably, the density of the aerosol-generating substrate is at least about 130 μg/cm3. Even more preferably, the density of the aerosol-generating substrate is at least about 140 μg/cm3.

The density of the aerosol-generating substrate may be less than or equal to about 200 μg/cm3. Preferably, the density of the aerosol-generating substrate is less than or equal to about 185 μg/cm3. More preferably, the density of the aerosol-generating substrate is about 170 μg/cm3 or less. Even more preferably, the density of the aerosol-generating substrate is less than or equal to about 160 μg/cm3.

In some embodiments, the density of the aerosol-generating substrate is between 100 μg/cm³ and 200 μg/cm³, preferably between 100 μg/cm³ and 185 μg/cm³, more preferably between 100 μg/cm³ and 170 μg/cm³, and even more. Preferably it is 100 μg/cm3 to 160 μg/cm3. In another embodiment, the density of the aerosol-generating substrate is between 115 μg/cm³ and 200 μg/cm³, preferably between 115 μg/cm³ and 185 μg/cm³, more preferably between 115 μg/cm³ and 170 μg/cm³, and even more Preferably it is 115 μg/cm³ to 160 μg/cm³. In a further embodiment, the density of the aerosol-generating substrate is between 130 μg/cm³ and 200 μg/cm³, preferably between 130 μg/cm³ and 185 μg/cm³, more preferably between 130 μg/cm³ and 170 μg/cm³, even more Preferably it is 130 μg/cm³ to 160 μg/cm³. In a further embodiment, the density of the aerosol-generating substrate is between 140 μg/cm³ and 200 μg/cm³, preferably between 140 μg/cm³ and 185 μg/cm³, more preferably between 140 μg/cm³ and 170 μg/cm³, even more Preferably it is 140 μg/cm3 to 160 μg/cm3. In some particularly preferred embodiments, the density of the aerosol-generating substrate is about 150 μg/cm3.

The density of the aerosol-generating substrate may be at least about 100 mg/cm3. Preferably, the density of the aerosol-generating substrate is at least about 115 mg/cm3. More preferably, the density of the aerosol-generating substrate is at least about 130 mg/cm3. Even more preferably, the density of the aerosol-generating substrate is at least about 140 mg/cm3.

The density of the aerosol-generating substrate may be less than or equal to about 200 mg/cm3. Preferably, the density of the aerosol-generating substrate is less than or equal to about 185 mg/cm3. More preferably, the density of the aerosol-generating substrate is about 170 mg/cm3 or less. Even more preferably, the density of the aerosol-generating substrate is less than or equal to about 160 mg/cm3.

In some embodiments, the aerosol-generating substrate has a density of about 100 mg/cm³ to about 200 mg/cm³, preferably about 100 mg/cm³ to about 185 mg/cm³, more preferably about 100 mg/cm³ to about 170 mg/cm³. mg/cm3, even more preferably from about 100 mg/cm3 to about 160 mg/cm3. In another embodiment, the aerosol-generating substrate has a density of from about 115 mg/cm³ to about 200 mg/cm³, preferably from about 115 mg/cm³ to about 185 mg/cm³, more preferably from about 115 mg/cm³ to about 170 mg/cm³. mg/cm3, even more preferably from about 115 mg/cm3 to about 160 mg/cm3. In a further embodiment, the aerosol-generating substrate has a density of from about 130 mg/cm³ to about 200 mg/cm³, preferably from about 130 mg/cm³ to about 185 mg/cm³, more preferably from about 130 mg/cm³ to about 170 mg/cm³. mg/cm3, even more preferably from about 130 mg/cm3 to about 160 mg/cm3. In a further embodiment, the density of the aerosol-generating substrate is from about 140 mg/cm³ to about 200 mg/cm³, preferably from about 140 mg/cm³ to about 185 mg/cm³, more preferably from about 140 mg/cm³ to about 170 mg /cm3, even more preferably from about 140 mg/cm3 to about 160 mg/cm3. In some particularly preferred embodiments, the density of the aerosol-generating substrate is about 150 mg/cm3.

By way of example, the aerosol-generating component may include from about 100 mg to about 250 mg of the aerosol-generating substrate. In some embodiments, the aerosol-generating component comprises between about 210 mg and about 230 mg of the aerosol-generating substrate, preferably between 215 mg and about 220 mg of the aerosol-generating substrate. In another embodiment, the aerosol-generating component comprises from about 150 mg to about 180 mg of the aerosol-generating substrate, preferably from 160 mg to about 165 mg of the aerosol-generating substrate.

The aerosol-generating substrate may be a solid aerosol-generating substrate.

In certain preferred embodiments, the aerosol-generating substrate comprises homogenized plant material, preferably homogenized tobacco material.

As used herein, the term "homogenized plant material" encompasses any plant material formed by agglomeration of particles of a plant. For example, a sheet or web of homogenised tobacco material for an aerosol-generating substrate of the present disclosure may be formed by agglomerate particles of plant material and, optionally, tobacco material obtained by pulverizing, milling or grinding one or more of tobacco leaf blades and tobacco petioles. can Homogenized plant material may be produced by casting, extrusion, papermaking processes or any other suitable process known in the art.

The homogenized plant material may be provided in any suitable form.

In some embodiments, the homogenized plant material may be in the form of one or more sheets. As used herein in connection with the present invention, the term "sheet" describes a laminated element having a width and length substantially greater than its thickness.

Alternatively or additionally, the homogenized plant material may be in the form of a plurality of pellets or granules.

Alternatively or additionally, the homogenized plant material may be in the form of a plurality of strands, strips or pieces. As used herein, the term “strand” describes an elongated element of material having a length substantially greater than its width and thickness. The term “strand” should be taken to include strips, flakes and any other homogenized plant material having a similar shape. Strands of homogenized plant material may be formed into sheets of homogenized plant material, for example by cutting or crushing, or for example by other methods, such as extrusion methods.

In some embodiments, it may be formed in situ within an aerosol-generating substrate as a result of splitting or cracking of a sheet of homogenized plant material during formation of the aerosol-generating substrate, for example as a result of crimping . The strands of homogenized plant material inside the aerosol-generating substrate may be separate from one another. Alternatively, each strand of homogenized plant material within the aerosol-generating substrate may be at least partially connected to an adjacent strand or strands along the length of the strands. For example, adjacent strands may be connected by one or more fibers. This may occur, for example, where strands are formed due to splitting of sheets of homogenized plant material during production of the aerosol-generating substrate, as described above.

When the aerosol-generating substrate comprises homogenized plant material, the homogenized plant material may typically be provided in the form of one or more sheets. In particular, sheets of homogenized plant material may be produced by a casting process. Preferably, the sheet of homogenized plant material can be produced by a papermaking process.

In some preferred embodiments, the aerosol-generating substrate comprises a cut sheath. In the context of this specification, the term “cut sheath” is used to describe a blend of shredded plant material, such as tobacco plant material, especially comprising one or more of leaf blades, engineered stems and ribs.

The cut filler may also include a cut filler tobacco or casing after other cutting.

Preferably, the cut sheath comprises at least 25% plant foliage, more preferably at least 50% plant foliage, even more preferably at least 75% plant foliage, and most preferably at least 90% plant foliage. . Preferably, the plant material is one of tobacco, mint, tea and clove. However, as explained in detail below, the present invention is equally applicable to other plant materials that have the ability to release substances upon application of heat that can subsequently form an aerosol.

Preferably, the cut filler comprises tobacco plant material comprising lamina of one or more of bright tobacco, dark tobacco, flavored tobacco and cut filler tobacco. With reference to this disclosure, the term “tobacco” describes any plant member of the genus Nicotiana.

Bright tobacco is generally large, light-colored leaf tobacco. Throughout this specification, the term “bright tobacco” is used for heat-dried tobacco. Examples of bright tobaccos are Chinese yellows, Brazilian yellows, American yellows such as Virginia tobacco, Indian yellows, Tanzanian yellows or other African yellows. Bright tobacco is characterized by a high sugar to nitrogen ratio. From a sensory point of view, bright tobacco is a type of tobacco that is associated with a pungent and lively sensation after drying. In the context of this disclosure, bright tobacco is tobacco with a reducing sugar content of about 2.5% to about 20% by dry weight of leaves and a total ammonia content of less than about 0.12% by dry weight of leaves. Reducing sugars include, for example, glucose or fructose. Total ammonia includes, for example, ammonia and ammonia salts.

Dark tobacco is generally large, dark-colored leaf tobacco. Throughout this specification, the term "dark tobacco" is used for air-dried tobacco. Also, dark tobacco can be fermented. Tobacco, which is primarily used for chewing tobacco, snuff, cigars and pipe blends, also falls into this category. Typically, these dark tobaccos are air-dried and possibly fermented. From a sensory point of view, dark tobacco is a type of tobacco that has a smoky odor after curing and is associated with a dark cigar type sensation. Dark tobacco is characterized by a low sugar to nitrogen ratio. Examples of dark tobacco are Burley Malawi or other African Burley, fumigated Brazilian Gaupang, sun-dried or air-dried Indonesian Kasturi. According to the present invention, dark tobacco is tobacco having a reducing sugar content of less than about 5% by dry weight of leaves and a total ammonia content of up to about 0.5% by dry weight of leaves.

Flavored tobacco is usually small, light-colored leaf tobacco. Throughout this specification, the term "flavored tobacco" is used for other tobaccos having a high aromatic content, eg of essential oils. From a sensory point of view, flavored tobacco is a type of tobacco that, after curing, is associated with pungent and aromatic sensations. Examples of flavored tobacco are Greek oriental, oriental turkish, semi-oriental tobacco, as well as burnt, American burleys such as Perique, Rustica, American Burley or Maryland. Cut filler tobacco is not a specific tobacco type, but includes tobacco types that are primarily used to complement other tobacco types used in blends and do not induce aromatization of a particular character in the final product. Examples of cut filler cigarettes are the stems or stems of other tobacco types. A specific example would be the heat-dried stalk of a Brazilian xanthomas lower stem.

Cut fillers suitable for use with the present disclosure may be similar to cut fillers generally used in conventional smoking articles. The cutting width of the cut sheath is preferably 0.3 mm to 2.0 mm, more preferably, the cutting width of the cut sheath is 0.5 mm to 1.2 mm, and most preferably the cutting width of the cut sheath is 0.6 mm to 0.9 mm. Cut width can play a role in heat distribution within the aerosol-generating element. Cut width can also play a role in the article's resistance to draw. Also, the cut width can affect the overall density of the aerosol-generating substrate as a whole.

The strand length of each second is a somewhat random value as the length of the strand will depend on the overall size of the object from which the strand is cut. Nevertheless, longer strands can be cut by conditioning the material prior to cutting, for example by controlling the moisture content and overall compaction of the material. Preferably, the strands have a length of about 10 mm to about 40 mm before the strands are gathered to form the aerosol-generating element. Obviously, where the longitudinal extension of a section is less than 40 mm, if the strands are arranged within the aerosol-generating element within the longitudinal extension, the final aerosol-generating element may include strands that are, on average, shorter than the initial strand length. Preferably, the strand length of the cut sheath is such that about 20% to 60% of the strands extend along the entire length of the aerosol-generating element. This prevents the strand from easily disengaging from the aerosol-generating element.

In a preferred embodiment, the weight of the cut filler is 80 mg to 400 mg, preferably 150 mg to 250 mg, more preferably 170 mg to 220 mg. This amount of cut filler usually allows sufficient material for the formation of an aerosol. Additionally, taking into account the aforementioned diameter and size constraints, this allows a balanced density of the aerosol-generating element between energy absorption, resistance to draw and fluid passages within the aerosol-generating element where the aerosol-generating substrate comprises plant material.

Preferably, the cut filler is impregnated with an aerosol former. Dipping the cut filler can be done by spraying or by other suitable application methods. Aerosol formers can be applied to the blend during manufacture of the cut filler. For example, an aerosol former may be applied to the blend within a direct conditioning casing cylinder (DCCC). A conventional machine may be used to apply the aerosol former to the cut filler. The aerosol former can be any suitable known compound or mixture of compounds that facilitates the formation of a dense and stable aerosol upon use. The aerosol former may facilitate resistance of the aerosol to thermal degradation substantially at temperatures normally employed during use of the aerosol-generating article. Suitable aerosol formers include, for example, polyhydric alcohols such as triethylene glycol, 1,3-butanediol, propylene glycol, and glycerin; esters of polyhydric alcohols such as glycerol mono-, di- or triacetate; aliphatic esters of mono-, di- or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate; and combinations thereof.

Preferably, the aerosol former comprises at least one of glycerin and propylene glycol. The aerosol former may consist of glycerin or propylene glycol or a combination of glycerin and propylene glycol.

Preferably, the amount of aerosol former is from 6% to 20% by weight based on the dry weight of the cut sheath, more preferably, the amount of aerosol former is from 8% to 18% by weight based on the dry weight of the cut sheath, most Preferably the amount of aerosol former is from 10% to 15% by weight based on the dry weight of the cut filler. When the aerosol former is added to the cut filler in the amounts described above, the cut filler can be relatively sticky. This advantageously helps to hold the cut filler in place within the article, as the particles of the cut filler tend to adhere to the surrounding cut filler as well as to the surrounding surface (eg, the inner surface of the wrapper surrounding the cut filler).

For some embodiments, the amount of aerosol former has a target value of about 13% by weight on a dry weight basis of cut filler. The most effective amount of aerosol former will also depend on the cut sheath, whether or not the cut sheath contains plant laminae or homogenized plant material. For example, the type of cut filler, among other factors, will determine the extent to which the aerosol former can facilitate the release of material from the cut filler.

For these reasons, the aerosol-generating element including the cut sheath as described above can efficiently generate a sufficient amount of aerosol at a relatively low temperature. A temperature of 150° C. to 200° C. in the heating chamber is sufficient for such a cut filler to generate a sufficient amount of aerosol, but temperatures of about 250° C. are commonly used in aerosol generating devices using tobacco cast leaf sheets.

An additional advantage associated with operating at lower temperatures is the reduced need to cool the aerosol. Since lower temperatures are generally used, a simpler cooling function may suffice. This, in turn, allows the use of simpler and less complex structures of aerosol-generating articles.

As briefly described above, where the aerosol-generating substrate comprises homogenized plant material, the homogenized plant material may be provided in the form of one or more sheets.

The one or more sheets as described herein may each individually have a thickness of from 100 μm to 600 μm, preferably from 150 μm to 300 μm, most preferably from 200 μm to 250 μm. Individual thickness refers to the thickness of individual sheets, while combined thickness refers to the total thickness of all sheets comprising the aerosol-generating substrate. For example, if the aerosol-generating substrate is formed from two separate sheets, the combined thickness is the sum of the thicknesses of the two separate sheets or the measured thicknesses of the two sheets to which the two sheets are laminated to the aerosol-generating substrate.

One or more sheets as described herein may each individually have a basis weight of about 100 gsm to about 600 gsm.

Each of the one or more sheets as described herein individually contains about 0.3 g/cm³ to about 1.3 g/cm3, preferably from about 0.7 g/cm3 to about 1.0 g/cm3.

In embodiments of the present disclosure in which the aerosol-generating substrate comprises one or more sheets of homogenized plant material, the sheets are preferably in the form of one or more corrugated sheets. As used herein, the term "crimped" refers to a sheet of homogenized plant material being rolled, folded, or otherwise compressed or retracted substantially transversely to the cylindrical axis of a plug or rod.

One or more sheets of homogenized plant material may be gathered transversely about its longitudinal axis and wrapped with a wrapper to form a continuous rod or plug.

One or more sheets of homogenized plant material may advantageously be crimped or similarly treated. As used herein, the term "crimped" refers to a sheet having a plurality of substantially parallel ridges or corrugations. Alternatively or in addition to being crimped, one or more sheets of homogenized plant material may be embossed, engraved, perforated or otherwise deformed to provide texture on one or both sides of the sheet.

Preferably, each sheet of homogenized plant material may be crimped to have a plurality of ridges or corrugations substantially parallel to the cylindrical axis of the plug. This treatment advantageously facilitates the gathering of the crimped sheet of homogenized plant material to form a plug. Preferably, the one or more sheets of homogenized plant material may be corrugated. It will be appreciated that the crimped sheet of homogenized plant material may alternatively or additionally have a plurality of substantially parallel ridges and corrugations disposed at an acute or obtuse angle to the cylindrical axis of the plug. The sheet may be crimped to such an extent that the integrity of the sheet is destroyed in a plurality of parallel ridges or corrugations that cause separation of the material, resulting in the formation of pieces, strands or strips of homogenized plant material.

Alternatively, one or more sheets of homogenized plant material may be cut into strands as mentioned above. In this embodiment, the aerosol-generating substrate comprises a plurality of strands of homogenized plant material. Strands can be used to form plugs. Typically, these strands will have a width of about 5 mm, or about 4 mm, or about 3 mm, or about 2 mm or less. The length of the strands can be greater than about 5 mm, about 5 mm to about 15 mm, about 8 mm to about 12 mm, or about 12 mm. Preferably, the strands are of substantially equal length to each other.

The homogenized plant material may comprise up to about 95% by weight of plant particles on a dry weight basis. Preferably, the homogenized plant material comprises up to about 90% by weight of plant particles on a dry weight basis, more preferably up to about 80% by weight of plant particles, more preferably up to about 70% by weight of plant particles, even more preferably preferably up to about 60% by weight of plant particles, more preferably up to about 50% by weight of plant particles.

For example, the homogenized plant material may comprise, on a dry weight basis, about 2.5% to about 95% plant particles, or about 5% to about 90% plant particles, or about 10% to about 80% plant particles, by weight , or from about 15% to about 70% by weight of plant particles, or from about 20% to about 60% by weight of plant particles, or from about 30% to about 50% by weight of plant particles.

In certain embodiments of the present invention, the homogenized plant material is a homogenized tobacco material comprising tobacco particles. Sheets of homogenised tobacco material for use in this embodiment of the present invention contain at least about 40% by weight on a dry weight basis, more preferably at least about 50% by weight on a dry weight basis, and more preferably at least about 70% by weight, most preferably at least about 90% by weight on a dry weight basis.

With reference to this disclosure, the term “tobacco particle” describes a particle of any plant member of the genus Nicotiana . The term “tobacco particle” includes ground or powdered tobacco leaflets, ground or powdered tobacco petioles, tobacco dust, tobacco fines, and other particulate tobacco by-products formed during processing, handling, and shipping of tobacco. In a preferred embodiment, the tobacco particles are substantially entirely derived from tobacco leaf blades. In contrast, isolated nicotine and nicotine salts, although derived from tobacco, are not considered tobacco particles for the purposes of this invention and are not included in the percentage of particulate plant matter.

Alternatively or additionally, the aerosol-generating substrate may further comprise one or more aerosol formers. Upon evaporation, the aerosol former may deliver other evaporated compounds released from the aerosol-generating substrate upon heating, such as nicotine and flavoring agents, in the aerosol. Suitable aerosol formers for inclusion in the homogenized plant material are known in the art and include, but are not limited to, polyhydric alcohols such as triethylene glycol, propylene glycol, 1,3-butanediol and glycerol; esters of polyhydric alcohols such as glycerol mono-, di- or triacetate; and aliphatic esters of mono-, di- or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate.

The aerosol-generating substrate can form from about 5% to about 30% by weight on a dry weight basis, such as from about 10% to about 25% by weight on a dry weight basis, or from about 15% to about 20% by weight on a dry weight basis of aerosol formation. content can be

For example, if the substrate is intended for use in an aerosol-generating article for an electrically operated aerosol-generating system having a heating element, it preferably comprises an aerosol former content of from about 5% to about 30% by weight on a dry weight basis. can do. When the substrate is intended for use in an aerosol-generating article for an electrically operated aerosol-generating system having a heating element, the aerosol former may preferably be glycerol.

In another embodiment, the aerosol-generating substrate may have an aerosol former content of from about 1% to about 5% by weight on a dry weight basis. For example, if the substrate is intended for use in an aerosol-generating article in which the aerosol former is maintained in a reservoir separate from the substrate, the substrate may have an aerosol former content greater than 1% and less than about 5%. In this embodiment, the aerosol former evaporates upon heating and the stream of aerosol former is contacted with the aerosol-generating substrate to entrain flavor from the aerosol-generating substrate in the aerosol.

In another embodiment, the homogenized plant material may have an aerosol former content of about 30% to about 45% by weight. These relatively high levels of aerosol formers are particularly suitable for aerosol-generating substrates intended to be heated at temperatures below 275°C. In this embodiment, the homogenized plant material preferably further comprises from about 2% to about 10% by weight on a dry weight cellulose ether, and from about 5% to about 50% by weight on a dry weight of additional cellulose are doing The use of a combination of cellulose ethers with additional cellulose has been found to provide particularly effective delivery of aerosols when used in aerosol-generating substrates having an aerosol former content of 30% to 45% by weight.

Suitable cellulose ethers include, but are not limited to, methyl cellulose, hydroxypropyl methyl cellulose, ethyl cellulose, hydroxyl ethyl cellulose, hydroxyl propyl cellulose, ethyl hydroxyl ethyl cellulose, and carboxymethyl cellulose (CMC). In a particularly preferred embodiment, the cellulose ether is carboxymethyl cellulose.

As used herein, the term "additional cellulose" includes any cellulosic material incorporated into the homogenized plant material, which is not derived from tobacco particles or non-tobacco plant particles provided to the homogenized plant material. Thus, the additional cellulose is incorporated into the homogenized plant material as a separate and distinct cellulose source for any cellulose provided essentially within the non-tobacco plant particles or tobacco particles, in addition to the non-tobacco plant material or tobacco material. The additional cellulose will typically be derived from non-tobacco plant particles or from a different plant than the tobacco particles. Preferably, the additional cellulose is in the form of an inert cellulosic material, which is sensory inert and therefore does not substantially affect the organoleptic properties of the aerosol generated from the aerosol-generating substrate. For example, the additional cellulose is preferably a tasteless and odorless material.

Additional cellulose may include cellulose powder, cellulose fibers, or combinations thereof.

Aerosol formers can act as wetting agents in aerosol-generating substrates.

The wrapper surrounding the rod of homogenized plant material may be a paper wrapper or a non-paper wrapper. Suitable paper wrappers for use in certain embodiments of the present invention are known in the art and include cigarette paper; and filter plug wraps. Suitable non-paper wrappers for use in certain embodiments of the present invention are known in the art. Sheets of homogenised tobacco material include, but are not limited to. In certain preferred embodiments, the wrapper may be formed from a laminated material comprising a plurality of layers. Preferably, the wrapper is formed from an aluminum co-laminated sheet. The use of co-laminated sheets comprising aluminum advantageously prevents combustion of the aerosol-generating substrate in cases where the aerosol-generating substrate is to be ignited rather than heated in an intended manner.

In certain alternative embodiments of the present disclosure, the aerosol-generating substrate comprises an alkaloid compound, or a cannabinoid compound, or a gel composition comprising both an alkaloid compound and a cannabinoid compound. In a particularly preferred embodiment, the aerosol-generating substrate comprises a gel composition comprising nicotine.

Preferably, the gel composition comprises an alkaloid compound, or a cannabinoid compound, or both an alkaloid compound and a cannabinoid compound; aerosol formers; and at least one gelling agent. Preferably, the at least one gelling agent forms a solid medium, the glycerol is dispersed in the solid medium, and the alkaloid or cannabinoid is dispersed in the glycerol. Preferably, the gel composition is in a stable gel phase.

Advantageously, a stable gel composition comprising nicotine provides a predictable compositional shape upon storage or transfer from manufacture to consumer. A stable gel composition comprising nicotine substantially retains its shape. A stable gel composition comprising substantially nicotine does not release substantially a liquid phase upon storage or during transit from manufacture to consumer. A stable gel composition comprising nicotine can provide a simple consumable design. Such consumables may not need to be designed to contain liquids, so a wider range of materials and container configurations may be considered.

The gel composition described herein can be combined with an aerosol generating device to deliver a nicotine aerosol to the lungs at an inhalation or airflow rate that is within conventional smoking regime inhalation or airflow rates. The aerosol-generating device may continuously heat the gel composition. A consumer may take multiple inhalations or "puffs", each "puff" delivering a quantity of nicotine aerosol. The gel composition, when heated, is capable of delivering a high nicotine/low total particulate matter (TPM) aerosol to the consumer, preferably in a continuous manner.

The phrase "stable gel phase" or "stable gel" refers to a gel that substantially retains its shape and mass when exposed to various environmental conditions. A stable gel may not release substantially (sweat) or absorb water when exposed to standard temperature and pressure with varying relative humidity from about 10% to about 60%. For example, a stable gel can substantially retain its shape and mass when exposed to standard temperature and pressure while varying relative humidity from about 10% to about 60%.

The gel composition contains an alkaloid compound, or a cannabinoid compound, or both an alkaloid compound and a cannabinoid compound. The gel composition may include one or more alkaloids. A gel composition may include one or more cannabinoids. The gel composition may include a combination of one or more alkaloids and one or more cannabinoids.

The term “alkaloid compound” refers to any one of a class of naturally occurring organic compounds containing one or more basic nitrogen atoms. Generally, alkaloids contain at least one nitrogen atom in the amine-type structure. These or other nitrogen atoms in the molecule of an alkaloid compound can be activated as a base in an acid-base reaction. Most alkaloid compounds have one or more nitrogen atoms as part of a cyclic system, for example a heterocyclic ring. In fact, alkaloid compounds are found primarily in plants and are particularly common in certain flowering plant families. However, some alkaloid compounds are found in animal species and fungi. In this disclosure, the term “alkaloid compound” refers to both naturally occurring alkaloid compounds and synthetically prepared alkaloid compounds.

The gel composition may include an alkaloid compound, preferably selected from the group consisting of nicotine, anatabine, and combinations thereof.

Preferably, the gel composition contains nicotine.

The term “nicotine” refers to nicotine and nicotine derivatives such as free base nicotine, nicotine salts, and the like.

The term “cannabinoid compound” refers to a compound found in some of the cannabis plant—namely, Cannabis sativa, Cannabis indica , and Cannabis ruderalis species. Refers to any one of a class of naturally occurring compounds. Cannabinoid compounds are particularly concentrated in female flower heads. Cannabinoid compounds that occur naturally in the cannabis plant include cannabidiol (CBD) and tetrahydrocannabinol (THC). In this disclosure, the term “cannabinoid compound” is used to describe both naturally occurring cannabinoid compounds and synthetically prepared cannabinoid compounds.

Embodiments of the present invention in which the aerosol-generating element comprises an aerosol-generating substrate comprising a gel composition as described above advantageously include an upstream element upstream of the aerosol-generating element. In this case, the upstream element advantageously prevents physical contact with the gel composition. The upstream element may also advantageously compensate for any potential decrease in RTD due to evaporation of the gel composition, for example upon heating of the rod of the aerosol-generating substrate during use. Further details on the provision of one such upstream element will be described below.

The downstream section of the aerosol-generating article may be of any length. The downstream section may have a length of at least about 10 mm. For example, the downstream section can have a length of at least about 15 mm, at least about 20 mm, or at least about 25 mm, or at least about 30 mm.

Providing a downstream section having a length greater than the values listed above may advantageously provide a space for the aerosol to cool and condense before reaching the consumer. This may also ensure that the user is away from the heating element when the aerosol-generating article is used with an aerosol-generating device.

The downstream section may have a length of about 60 mm or less. For example, the downstream section may have a length of about 50 mm or less, about 55 mm or less, about 40 mm or less, or about 35 mm or less.

The downstream section may have a length of about 10 mm to about 60 mm, about 15 mm to about 50 mm, about 20 mm to about 55 mm, about 25 mm to about 40 mm, or about 30 mm to about 35 mm. For example, the downstream section may have a length of about 33 mm.

The ratio between the length of the downstream section and the length of the aerosol-generating substrate may be from about 1.0 to about 4.5.

Preferably, the ratio between the length of the downstream section and the length of the rod of the aerosol-generating substrate is at least about 1.5, more preferably at least about 2.0, and even more preferably at least about 2.5. In a preferred embodiment, the ratio between the length of the downstream section and the length of the rod of the aerosol-generating substrate is less than about 4.0, more preferably less than about 3.5, and even more preferably less than about 3.0.

In some embodiments, the ratio between the length of the downstream section and the length of the rod of the aerosol-generating substrate is from about 1.5 to about 4.0, preferably from about 2.0 to about 3.5, more preferably from about 2.5 to about 3.0.

In a particularly preferred embodiment, the ratio between the length of the downstream section and the length of the rod of the aerosol-generating substrate is about 2.75.

The ratio between the length of the downstream section and the overall length of the aerosol-generating article may be from about 0.1 to about 1.5.

Preferably, the ratio between the length of the downstream section and the overall length of the aerosol-generating article is at least about 0.25, more preferably at least about 0.50. The ratio between the length of the downstream section and the overall length of the aerosol-generating article is preferably less than about 1.25, more preferably less than about 1.0.

In some embodiments, the ratio between the length of the downstream section and the overall length of the aerosol-generating article is preferably from about 0.25 to about 1.25, more preferably from about 0.5 to about 1.0.

In a particularly preferred embodiment, the ratio between the length of the downstream section and the overall length of the aerosol-generating article is about 0.73.

The length of the downstream section may consist of the sum of the lengths of the individual components forming the downstream section.

The RTD of the downstream section may be less than or equal to about 100 mm H ₂ O. For example, the RTD of the downstream section is about 50 mm H ₂ O or less, about 25 mm H ₂ O or less, about 15 mm H ₂ O or less, about 10 mm H ₂ O or less, about 8 mm H ₂ O or less, about 5 mm H ₂ O or less, or about 1 mm H ₂ O or less.

The downstream section may include an unobstructed airflow path from a downstream end of the aerosol-generating substrate to a downstream end of the downstream section.

The unobstructed airflow path from the downstream end of the aerosol-generating substrate to the downstream end of the downstream section has a minimum diameter of about 0.5 mm. For example, an unobstructed airflow path may have a minimum diameter of 1 mm, 2 mm, 3 mm, or 5 mm.

The downstream section may include a hollow tubular segment. A hollow tubular segment may be referred to as a hollow tube, hollow tubular element, or hollow tubular segment.

The provision of hollow tubular segments can advantageously provide a desired overall length of an aerosol-generating article without increasing unacceptable resistance to draw.

The hollow tube may extend from a downstream end of the downstream section to an upstream end of the downstream section. That is, the entire length of the downstream section can be described by the hollow tubular segment. In this case, it will be appreciated that the lengths and length ratios given above with respect to the downstream section are equally applicable to the length of the hollow tubular segment.

The hollow tubular segment can abut the downstream end of the aerosol-generating article.

The hollow tubular segment can be spaced apart from the downstream end of the aerosol-generating article. In this case, there may be a void between the downstream end of the aerosol-generating substrate and the upstream end of the hollow tubular segment.

The hollow tubular segment may have an inner diameter. The hollow tubular segment may have a constant inner diameter along the length of the hollow tubular segment. The inner diameter of the hollow tubular segment may vary along the length of the hollow tubular segment.

The hollow tubular segment may have an inside diameter of at least about 2 mm. For example, the hollow tubular segment can have an inner diameter of at least about 4 mm, at least about 5 mm, or at least about 7 mm.

Providing a hollow tubular segment having an inside diameter as described above advantageously provides the hollow tubular segment with sufficient stiffness and strength.

The hollow tubular segment may have an inside diameter of about 10 mm or less. For example, the hollow tubular segment can have an inner diameter of about 9 mm or less, about 8 mm or less, or about 7.5 mm or less.

Providing a hollow tubular segment with an inner diameter as described above advantageously reduces the resistance to draw of the hollow tubular segment.

The hollow tubular segment may have an inner diameter of about 2 mm to about 10 mm, about 4 mm to about 9 mm, about 5 mm to about 8 mm, or about 7 mm to about 7.5 mm.

The hollow tubular segment may have an inside diameter of about 7.1 mm.

The ratio between the inner diameter of the hollow tubular segment and the outer diameter of the hollow tubular segment may be at least about 0.8. For example, the ratio between the inner diameter of the hollow tubular segment and the outer diameter of the hollow tubular segment may be at least about 0.85, at least about 0.9, or at least about 0.95.

The ratio between the inner diameter of the hollow tubular segment and the outer diameter of the hollow tubular segment may be less than or equal to about 0.99. For example, the ratio between the inner diameter of the hollow tubular segment and the outer diameter of the hollow tubular segment may be about 0.98 or less.

The ratio between the inner diameter of the hollow tubular segment and the outer diameter of the hollow tubular segment may be at least about 0.97.

Providing a relatively large inner diameter advantageously reduces the resistance to draw of the hollow tubular segment.

The lumen of the hollow tubular segment may have any cross-sectional shape. The lumen of the hollow tubular segment may have a circular cross-sectional shape.

The hollow tubular segments may be formed from any suitable material. For example, the hollow tube may include cellulose acetate tow. When the hollow tubular segment comprises cellulose acetate tow, the hollow tubular segment may have a thickness of about 0.1 mm to about 1 mm. The hollow tubular segment may have a thickness of about 0.5 mm.

When the hollow tubular segment comprises cellulose acetate tow, the cellulose acetate tow may have a denier per filament of about 2 to about 4 and a total denier of about 25 to about 40.

The hollow tubular segment may include paper. The hollow tubular segment may include at least one paper layer. The paper may be a very rigid paper. The paper may be crimped paper, such as crimped heat resistant paper or crimped parchment. Paper may be cardboard. The hollow tubular segment may be a paper tube. The hollow tubular segment may be a tube formed of spirally wound paper. The hollow tubular segments may be formed from a plurality of layers of paper. The paper may have a basis weight of at least about 50 gsm, at least about 60 gsm, at least about 70 gsm, or at least about 90 gsm.

When the tubular segment comprises paper, the paper may have a thickness of at least about 50 μm. For example, the paper can have a thickness of at least about 70 μm, at least about 90 μm, or at least about 100 μm.

The hollow tubular segment may include a polymer. For example, the hollow tubular segment may include a polymeric film. The polymer film may include a cellulosic film. The hollow tubular segments may include low density polyethylene (LDPE) or polyhydroxyalkanoate (PHA) fibers.

The downstream section may include a deformed tubular element. A deformed tubular element may be provided in place of the hollow tubular element. A deformed tubular element may be provided immediately downstream of the aerosol-generating substrate. The deformed tubular element may abut the aerosol-generating substrate.

The deformed tubular element may include a tubular body defining a cavity extending from a first upstream end of the tubular body to a second downstream end of the tubular body. The deformed tubular element may also include a folded end portion forming a first end wall at the first upstream end of the tubular body. The first end wall may define an opening allowing airflow between the cavity and the exterior of the deformed tubular element. Preferably, the aperture is configured to allow airflow from the aerosol-generating substrate through the aperture into the cavity.

The cavities of the tubular body may be substantially hollow to permit substantially unrestricted airflow along the cavities. The RTD of the deformed tubular element may be localized to a specific longitudinal location of the deformed tubular element. In particular, the RTD of the deformed tubular element can be localized to the first end wall. In this way, the RTD of the deformed tubular element can be substantially controlled through the selected configuration of the first end wall and its corresponding aperture. The RTD of the deformed tubular element (essentially the same as the RTD of the first end wall) is of the same order of magnitude as the RTD of the hollow tubular segment described in this disclosure.

The deformed tubular element can be of any length. The deformed tubular element may have a length of about 10 mm to about 60 mm, about 15 mm to about 50 mm, about 20 mm to about 55 mm, about 25 mm to about 40 mm, or about 30 mm to about 35 mm. For example, the deformed tubular element may have a length of about 33 mm.

The deformed tubular element can have any outer diameter D _E . The deformed tubular element may have an outer diameter (D _E ) of about 5 mm to about 12 mm, about 6 mm to about 12 mm, or about 7 mm to about 12 mm. The deformed tubular element may have an outer diameter (D _E ) of about 7.3 mm.

The deformed tubular element can have any inner diameter D _I . The deformed tubular element may have an inner diameter (D _I ) of about 2 mm to about 10 mm, about 4 mm to about 9 mm, about 5 mm to about 8 mm, or about 7 mm to about 7.5 mm. The deformed tubular element may have an inner diameter D _I of about 7.1 mm.

The deformed tubular element may have a peripheral wall of any thickness. A peripheral wall of the deformed tubular element may have a thickness of about 0.05 mm to about 0.5 mm. A peripheral wall of the deformed tubular element may have a thickness of about 0.1 mm.

The downstream section may include ventilation. Ventilation may be provided to allow cooler air from the exterior of the aerosol-generating article to enter the interior of the downstream section.

Aerosol-generating articles may typically have ventilation levels of at least about 10%, preferably at least about 20%.

In a preferred embodiment, the aerosol-generating article has a ventilation level of at least about 20% or 25% or 30%. More preferably, the aerosol-generating article has a ventilation level of at least about 35%.

Aerosol-generating articles preferably have a ventilation level of less than about 80%. More preferably, the aerosol-generating article has a ventilation level of less than about 60% or less than about 50%.

Aerosol-generating articles may typically have a ventilation level of about 10% to about 80%.

In some embodiments, the aerosol-generating article has a ventilation level of about 20% to about 80%, preferably about 20% to about 60%, more preferably about 20% to about 50%. In another embodiment, the aerosol-generating article has a ventilation level of about 25% to about 80%, preferably about 25% to about 60%, more preferably about 25% to about 50%. In a further embodiment, the aerosol-generating article has a ventilation level of about 30% to about 80%, preferably about 30% to about 60%, more preferably about 30% to about 50%.

In particularly preferred embodiments, the aerosol-generating article has a ventilation level of about 40% to about 50%. In some particularly preferred embodiments, the aerosol-generating article has a ventilation level of about 45%.

Without being bound by theory, the inventors have found that the reduction in temperature caused by introducing cooler outside air into the hollow tubular segments can have a beneficial effect on the nucleation and growth of aerosol particles.

Formation of aerosols from gas mixtures containing various species relies on delicate interactions between nucleation, evaporation, and condensation as well as coalescence, all accounting for changes in vapor concentration, temperature, and velocity field. The so-called classical nucleation theory is based on the assumption that the fraction of gaseous molecules is large enough to remain coherent for a long time with sufficient probability (eg half probability). These molecules represent some kind of critical critical molecular cluster among the transient molecular assemblages, indicating that, on average, smaller molecular clusters are likely to disintegrate into the vapor phase rather quickly, whereas larger clusters are likely to grow on average. it means. These main clusters are identified as the main nucleation cores from which droplets are expected to grow due to the condensation of molecules from the vapor. It is assumed that pure droplets that have just been nucleated can appear to a certain original diameter and then grow by many orders of magnitude. This can be facilitated and enhanced by rapid cooling of the ambient steam leading to condensation. In this regard, it is helpful to remember that evaporation and condensation are two aspects of one and the same mechanism, namely gas-liquid mass transfer. While evaporation relates to the net mass transfer from liquid droplets to the gas phase, condensation is the net mass transfer from the gas phase to the droplet phase. Evaporation (or condensation) will cause the droplets to contract (or grow), but the number of droplets will not change.

In these scenarios, which can be further complicated by coalescence, cooling temperature and rate can play an important role in determining how the system reacts. In general, since the nucleation process is typically non-linear, different cooling rates can lead to significantly different temporal behaviors regarding the formation of liquid phases (droplets). Without being bound by theory, it is hypothesized that cooling may cause a rapid increase in the number concentration of droplets, which may be followed by a strong and short-lived increase in growth (nucleation burst). These nucleation bursts would appear to be more significant at lower temperatures. It will also be seen that higher cooling rates may favor early initiation of nucleation. In contrast, decreasing the cooling rate would appear to have a positive effect on the final size aerosol droplets ultimately reach.

Thus, the rapid cooling induced by introducing outside air into the hollow tubular segment can advantageously be used to favor the nucleation and growth of aerosol droplets. At the same time, however, the introduction of outside air into the hollow tubular segment has the immediate disadvantage of diluting the aerosol stream delivered to the consumer.

The present inventors have surprisingly found that the dilution effect on aerosols - which can be evaluated in particular by measuring the effect on the delivery of aerosol formers (such as glycerol) contained in the aerosol-generating substrate - is advantageous when ventilation levels are within the ranges specified above. was found to be minimal. In particular, ventilation levels between 25% and 50%, and even more preferably between 28 and 42% have been found to result in particularly satisfactory values of glycerin delivery. At the same time, the degree of nucleation and, consequently, the delivery of nicotine and aerosol formers (eg glycerol) is enhanced.

Ventilation into the downstream section may be provided along substantially the entire length of the downstream section. In this case, the downstream section may include a porous material that allows air to enter the downstream section. For example, if the downstream section includes a hollow tubular segment, the hollow segment may be formed of a porous material that allows air to enter the interior of the hollow tubular segment. If the downstream section includes a wrapper, the wrapper may be formed of a porous material that allows air to enter the interior of the hollow tubular segment.

The downstream section may include a first ventilation zone for providing ventilation into the downstream section. The first ventilation zone comprises a portion of the downstream section through which a greater volume of air can pass compared to the rest of the downstream section. For example, the first ventilation zone may be a portion of the downstream section that has a higher porosity than the rest of the downstream section.

The first ventilation zone may include a porous portion of the downstream section having ventilation of at least 5%. For example, the first ventilation zone may include a porous portion of the downstream section having ventilation of at least 10%, at least 20%, at least 25%, at least 30%, or at least 35% ventilation.

The first ventilation zone may include a porous portion of the downstream section having ventilation of 80% or less. For example, the first ventilation zone may include a porous portion of the downstream section having less than 60% ventilation, or less than 50% ventilation.

The first ventilation zone may include a porous portion of the downstream section having a ventilation of 10% to 80%, 20% to 80%, 20% to 60%, or 20% to 50%. In other embodiments, the first ventilation zone may include a porous portion of the downstream section having ventilation between 25% and 80%, between 25% and 60%, or between 25% and 50%. In further embodiments, the first ventilation zone can include a porous portion of the downstream section having ventilation between 30% and 80%, between 30% and 60%, or between 30% and 50%.

The first ventilation zone may include a porous portion of the downstream section having between 40% and 50% ventilation. In some particularly preferred embodiments, the first ventilation zone may include a porous portion of the downstream section with 45% ventilation.

The first ventilation zone may include a first line of perforations surrounding the downstream portion.

In some embodiments, the ventilation zone may include, for example, two circumferential rows of perforated holes. For example, the burr holes may be formed en bloc during manufacture of the aerosol-generating article. Each circumferential row of perforation holes may include from about 5 to about 40 perforations, for example each circumferential row of perforation holes may include from about 8 to about 30 perforations.

If the aerosol-generating article comprises a combined plug wrap, the ventilation zone preferably comprises at least one row of perforated holes on its circumference provided through a portion of the combined plug wrap. They may also be formed en bloc during manufacture of the smoking article. Preferably, the circumferential row(s) of perforations provided through a portion of the mating plug wrap are substantially aligned with the row(s) of perforations through the downstream section.

If the aerosol-generating article comprises a band of tipping paper, the band of tipping paper extends over the circumferential row(s) of perforations in the downstream section, and the ventilation zone preferably extends through at least one of the perforated holes provided through the band of tipping paper. It contains one corresponding circumferential row. They may also be formed en bloc during manufacture of the smoking article. Preferably, the circumferential row(s) of perforations provided through the band of tipping paper are substantially aligned with the row(s) of perforations through the downstream section.

The first line of puncture holes may include at least one puncture hole having a width of at least about 50 μm. For example, the first line of puncture holes may include at least one puncture hole having a width of at least about 65 μm, at least about 80 μm, at least about 90 μm, or at least about 100 μm.

The first line of puncture holes may include at least one puncture hole having a width of about 200 μm or less. For example, the first line of puncture holes may include at least one puncture hole having a width of about 175 μm or less, about 150 μm or less, about 125 μm or less, or about 120 μm or less.

The first line of perforation holes comprises at least one perforation hole having a width of about 50 μm to about 200 μm, about 65 μm to about 175 μm, about 90 μm to about 150 μm, or about 100 μm to about 120 μm. can do.

When the drilling hole is formed using a laser drilling technique, the width of the drilling hole can be determined by the focal diameter of the laser.

The first line of burr holes may include at least one burr hole having a length of at least about 400 μm. For example, the first line of puncture holes may include at least one puncture hole having a length of at least about 425 μm, at least about 450 μm, at least about 475 μm, or at least about 500 μm.

The first line of burr holes may include at least one burr hole having a length of about 1 mm or less. For example, the first line of puncture holes may include at least one puncture hole having a length of about 950 μm or less, about 900 μm or less, about 850 μm or less, or about 800 μm or less.

The first line of perforation holes is about 400 μm to about 1 mm, about 425 μm to about 950 μm, about 450 μm to about 900 μm, or about 475 μm to about 850 μm, or about 500 μm to about 800 μm in length. It may include at least one perforation hole having a.

The first line of burr holes may include at least one burr hole having an open area of about 0.01 mm ² or less. For example, the first line of burr holes may include at least one burr hole having an open area of at least about 0.02 mm ² , at least about 0.03 mm ² , or at least about 0.05 mm ² .

The first line of burr holes may include at least one burr hole having an open area of about 0.5 mm ² or less. For example, the first line of burr holes may include at least one burr hole having an open area of about 0.3 mm ² or less, about 0.25 mm ² or less, or about 0.1 mm ^{2 or} less.

The first line of perforation holes comprises at least one perforation hole having an open area of about 0.01 mm to about 0.5 mm, about 0.02 mm to about 0.3 mm, about 0.03 mm to about 0.25 mm, or about 0.05 mm to about 0.1 mm. can include The first line of burr holes may include at least one burr hole having an open area of about 0.05 mm ² to about 0.096 mm ² .

As noted above, the aerosol-generating article may include a wrapper surrounding at least a portion of the downstream section, and the first ventilation zone may include a porous portion of the wrapper.

The wrapper may be a paper wrapper and the first ventilation zone may comprise a portion of porous paper.

As noted above, the downstream section may include a hollow tube spaced from the downstream end of the aerosol-generating substrate. In this case, the hollow tube may be connected to the aerosol-generating substrate by means of a paper wrapper. The wrapper may be a porous paper wrapper. In this case, the first ventilation zone may comprise a portion of the porous paper wrapper covering the space between the downstream end of the aerosol-generating substrate and the upstream end of the hollow tube. In this case, the upstream end of the first ventilation zone abuts the downstream end of the aerosol-generating substrate, and the downstream end of the first ventilation zone abuts the upstream end of the hollow tube.

The porous portion of the wrapper forming the first ventilation zone may have a basis weight lower than the basis weight of a portion of the wrapper that does not form part of the first ventilation zone.

The porous portion of the wrapper forming the first ventilation zone may have a thickness lower than the thickness of a portion of the wrapper that does not form part of the first ventilation zone.

The upstream end of the first ventilation zone may be less than 10 mm from the downstream end of the aerosol-generating substrate.

For example, the upstream end of the first ventilation zone may be less than 8 mm, less than 5 mm, less than 3 mm, or less than 1 mm from the downstream end of the aerosol-generating substrate.

An upstream end of the first ventilation zone may be longitudinally aligned with a downstream end of the aerosol-generating substrate.

The upstream end of the first ventilation zone may be located less than 25% of the length of the downstream element from the downstream end of the aerosol-generating substrate. For example, the upstream end of the first ventilation zone is less than 20%, less than 18%, less than 15%, less than 10%, less than 5%, or 1% along the length of the downstream element from the downstream end of the aerosol-generating substrate. % can be located below.

The downstream end of the first ventilation zone may be located less than 30% of the length along the length of the downstream element from the downstream end of the aerosol-generating substrate. For example, the downstream end of the first ventilation zone is less than 25%, less than 20%, less than 18%, less than 15%, less than 10%, or 5% along the length of the downstream element from the downstream end of the aerosol-generating substrate. % can be located below.

The downstream end of the first ventilation zone may be 10 mm or less from the downstream end of the aerosol-generating substrate. That is, the first ventilation zone may be located entirely within 10 mm of the aerosol-generating substrate.

For example, the downstream end of the first ventilation zone can be 8 mm or less, 5 mm or less, or 3 mm or less from the downstream end of the aerosol-generating substrate. The first ventilation zone may be located anywhere along the length of the downstream section. The downstream end of the first ventilation zone can be located no more than about 25 millimeters from the downstream end of the aerosol-generating article. For example, the first ventilation zone can be located no more than about 20 millimeters from the downstream end of the aerosol-generating article.

Positioning the first ventilation zone as described above can advantageously prevent the first ventilation zone from being blocked when the aerosol-generating article is inserted into the aerosol-generating device.

The downstream end of the first ventilation zone can be located at least about 8 mm from the downstream end of the aerosol-generating article. For example, the downstream end of the first ventilation zone can be located at least about 10 mm, at least 12 mm, or at least about 15 mm from the downstream end of the aerosol-generating article.

Positioning the first ventilation zone as described above may advantageously prevent the first ventilation zone from being blocked by the user's mouth or lips when the aerosol-generating article is in use.

The downstream end of the first ventilation zone may be located about 8 mm to about 25 mm, about 10 mm to about 25 mm, or about 15 mm to about 20 mm from the downstream end of the aerosol-generating article. The downstream end of the first ventilation zone may be located about 18 mm from the downstream end of the aerosol-generating article.

The upstream end of the first ventilation zone may be located at least about 20 mm from the upstream end of the aerosol-generating article. For example, the upstream end of the first ventilation zone can be located at least about 25 mm from the upstream end of the aerosol-generating article.

Positioning the first ventilation zone as described above can advantageously prevent the first ventilation zone from being blocked when the aerosol-generating article is inserted into the aerosol-generating device.

The upstream end of the first ventilation zone may be located no more than about 37 mm from the upstream end of the aerosol-generating article. For example, the upstream end of the first ventilation zone can be located at least about 30 mm or less from the upstream end of the aerosol-generating article.

Positioning the first ventilation zone as described above may advantageously prevent the first ventilation zone from being blocked by the user's mouth or lips when the aerosol-generating article is in use.

The upstream end of the first ventilation zone may be located between about 20 mm and about 37 mm, or between about 25 mm and about 30 mm from the upstream end of the aerosol-generating article. An upstream end of the first ventilation zone may be located about 27 mm from a downstream end of the aerosol-generating article.

The first ventilation zone can have any length. The first ventilation zone may have a length of at least 0.5 mm. That is, the longitudinal distance between the downstream end of the first ventilation zone and the upstream end of the first ventilation zone is at least 0.5 mm. For example, the first ventilation zone can have a length of at least 1 mm, at least 2 mm, at least 5 mm, or at least 8 mm.

The first ventilation zone may have a length of 10 mm or less. For example, the first ventilation zone may have a diameter of 8 mm or less, or 5 mm or less.

The first ventilation zone may have a length of about 0.5 mm to 10 mm. For example, the first ventilation zone may have a length of 1 mm to 8 mm, or 2 mm to 5 mm.

The aerosol-generating article may further include additional elements or components, such as filter segments or mouthpiece segments, in addition to the hollow tubular element and aerosol-generating element. Preferably, the downstream section of the aerosol-generating article may include elements or components other than hollow tubular elements, such as filter segments or mouthpiece segments.

These additional elements may be located downstream of the hollow tubular element. This additional element may be located immediately downstream of the hollow tubular element. These additional elements may be located between the aerosol-generating element and the hollow tubular element. This additional element may extend from the downstream end of the hollow tubular element to the mouth end of the aerosol-generating article or to the downstream end of the downstream section. These additional elements are preferably downstream elements or segments. These additional elements may be filter elements or segments or mouthpiece segments. These additional elements may form part of the downstream section of the aerosol-generating article of the present disclosure. These additional elements may axially align with the remaining components of the aerosol-generating article, such as the aerosol-generating element and the hollow tubular element. Further, the additional element may have a diameter similar to the outer diameter of the hollow tubular element, the diameter of the aerosol-generating element or the diameter of the aerosol-generating article.

Aerosol-generating articles of the present disclosure preferably include a wrapper surrounding a downstream section (or component of a downstream section). This wrapper may be an outer tipping wrapper surrounding the downstream section and a portion of the aerosol-generating element such that the downstream section is attached to the aerosol-generating element.

A downstream section of an aerosol-generating article of the present disclosure may define a concave cavity.

The aforementioned "additional element" may also be referred to as the "first section" or "first segment" of the "downstream section" in this disclosure. The term “first segment” or “additional element” alternatively refers to “mouthpiece segment”, “retention segment”, “downstream segment”, “mouthpiece element”, “downstream element”, “retention element”, "filter element" or "filter segment" or "downstream plug element". The term “mouthpiece” may refer to an element of an aerosol-generating article located downstream of the aerosol-generating element of the article, preferably near the mouth end of the article.

Unless otherwise specified, the resistance to draw (RTD) of a component or aerosol-generating article is measured according to ISO 6565-2015. RTD refers to the pressure required to force air through the entire length of a component. The term "pressure drop" or "resistance to draw" of a component or article may refer to "resist to draw". These terms generally refer to the output of a component measured normally at a temperature of about 22°C, a pressure of about 101 kPa (about 760 Torr) and a relative humidity of about 60%, or about Refers to measurements performed under test at a volumetric flow rate of 17.5 milliliters.

The resistance to draw per unit length of a particular component (or element) of an aerosol-generating article, such as a downstream section, first section or first segment, is calculated by dividing the measured component's resistance to draw by the total axial length of the component. It can be. RTD per unit length refers to the pressure required to force air through the entire length of a component. Throughout this disclosure, unit length refers to a length of one millimeter. Thus, in order to derive the RTD per unit length of a specific component, a specimen of a specific length of, for example, 15 millimeters of the component can be used for measurement. The RTD of these specimens is measured according to ISO 6565-2015. For example, if the measured RTD is 15 mm H ₂ O, the RTD per unit length of the component is about 1 mm H ₂ O per mm. The RTD per unit length of a component depends on the cross-sectional geometry or profile of the component as well as the structural properties of the material used in the component, among other factors.

The relative RTD, or RTD per unit length, of the downstream section may be from about 0 mm H ₂ O per mm to about 3 mm H ₂ O per mm. Alternatively, the RTD per unit length of the downstream section may be from about 0 mm H ₂ O per mm to about 2.5 mm H ₂ O per mm. Alternatively, the RTD per unit length of the downstream section may be from about 0 mm H ₂ O per mm to about 2 mm H ₂ O per mm. The RTD per unit length of the downstream section may be from about 0 mm H ₂ O per mm to about 1 mm H ₂ O per mm. The RTD per unit length of the downstream section may be from about 0 mm H ₂ O per mm to about 0.75 mm H ₂ O per mm.

As noted above, the relative RTD, or RTD per unit length, of the downstream section may be greater than about 0 mm H ₂ O per mm and less than about 3 mm H ₂ O per mm. Alternatively, the RTD per unit length of the downstream section may be greater than about 0 mm H ₂ O per mm and less than about 2.5 mm H ₂ O per mm. Alternatively, the RTD per unit length of the downstream section may be greater than about 0 mm H ₂ O per mm and less than about 2 mm H ₂ O per mm. The RTD per unit length of the downstream section may be greater than about 0 mm H ₂ O per mm and less than about 1 mm H ₂ O per mm. The RTD per unit length of the downstream section may be greater than about 0 mm H ₂ O per mm and less than about 0.75 mm H ₂ O per mm.

The RTD per unit length of the downstream section may be greater than or equal to about 0 mm H ₂ O per mm. Thus, the RTD per unit length of the downstream section may be from about 0 mm H ₂ O per mm to about 3 mm H ₂ O per mm. Alternatively, the RTD per unit length of the downstream section may be from about 0 mm H ₂ O per mm to about 2.5 mm H ₂ O per mm. Alternatively, the RTD per unit length of the downstream section may be from about 0 mm H ₂ O per mm to about 2 mm H ₂ O per mm. The RTD per unit length of the downstream section may be from about 0 mm H ₂ O per mm to about 1 mm H ₂ O per mm. The RTD per unit length of the downstream section may be from about 0 mm H ₂ O per mm to about 0.75 mm H ₂ O per mm.

The resistance to draw (RTD) of the downstream section may be greater than about 0 mm H ₂ O and less than about 10 mm H ₂ O. The resistance to draw of the downstream section may be greater than about 0 mm H ₂ O and less than about 5 mm H ₂ O. The resistance to draw of the downstream section may be greater than about 0 mm H ₂ O and less than about 2 mm H ₂ O. The resistance to draw of the downstream section may be greater than about 0 mm H ₂ O and less than about 1 mm H ₂ O.

That is, the RTD of the downstream section may be less than 10 mm H ₂ O. The RTD of the downstream section may be less than 5 mm H ₂ O. The RTD of the downstream section may be less than 2 mm H ₂ O. The RTD of the downstream section may be less than 1 mm H ₂ O. The RTD of the downstream section may be greater than 0 mm H ₂ O.

The upstream end of the aerosol-generating article may be defined by a wrapper. Providing a wrapper at the upstream end of the aerosol-generating article can advantageously retain the aerosol-forming substrate within the aerosol-generating article. This feature may also advantageously prevent direct contact of the user with the aerosol-generating substrate.

The wrapper may be mechanically closed at the upstream end of the aerosol-generating article. This can be accomplished by folding or twisting the wrapper. An adhesive may be used to close the upstream end of the aerosol-generating article.

The wrapper defining the upstream end of the aerosol-generating article may be formed from the same piece of material as the wrapper surrounding at least a portion of the downstream section.

Such provision may advantageously simplify manufacturing of the aerosol-generating article as only one piece of wrapper material may be required. Additionally, use of a single piece of wrapper material may eliminate the need for a seam to connect two pieces of wrapper material. This can advantageously simplify fabrication. The lack of a seam may advantageously prevent or reduce leakage of any aerosol-generating substrate out of the aerosol-generating article.

Aerosol-generating articles of the present disclosure may further include an upstream element upstream of the aerosol-generating substrate. The upstream element may extend from an upstream end of the aerosol-generating substrate to an upstream end of the aerosol-generating article. The upstream element may abut the upstream end of the aerosol-generating article. An upstream element may be referred to as an upstream section.

The aerosol-generating article may include an air inlet at an upstream end of the aerosol-generating article. Where the aerosol-generating article includes an upstream element, an air inlet may be provided through the upstream element. Air entering through the air inlet can be passed into the aerosol-generating substrate to generate a mainstream aerosol.

The upstream section may have a high RTD.

In embodiments of the present disclosure where the downstream section has a relatively low RTD, eg, less than about 10 mmH ₂ O, providing an upstream element with a relatively high RTD advantageously provides a high RTD, such as a filter downstream of the aerosol-generating substrate. The total allowable RTD can be provided without requiring an RTD element. In use, air enters the aerosol-generating article through the upstream end of the upstream section and passes through the upstream section into the aerosol-generating substrate. The air then passes into and through the downstream section and exits from the downstream end of the downstream section.

A majority of the total RTD of an aerosol-generating article can be accounted for by the RTD of the upstream section.

The ratio of the RTD of the upstream section to the RTD of the downstream section may exceed 1. For example, the RTD of the downstream section can be greater than about 2, greater than about 5, greater than about 8, greater than about 10, greater than about 15, greater than about 20, or greater than about 50.

The RTD of the upstream section may be at least about 5 mm H ₂ O. For example, the RTD of the upstream section can be at least about 10 mm H ₂ O, at least about 12 mm H ₂ O, at least about 15 mm H ₂ O, at least about 20 mm H ₂ O.

The RTD of the upstream section may be less than or equal to about 80 mm H ₂ O. For example, the RTD of the upstream section can be about 70 mm H ₂ O or less, about 60 mm H ₂ O or less, about 50 mm H ₂ O or less, or about 40 mm H ₂ O or less.

The RTD of the upstream section may be between about 5 mm H ₂ O and about 80 mm H ₂ O. For example, the RTD of the upstream section may be between about 10 mm H ₂ O and about 70 mm H ₂ O, between about 12 mm H ₂ O and about 60 mm H ₂ O, between about 15 mm H ₂ O and about 50 mm H ₂ O. , or from about 20 mm H ₂ O to about 40 mm H ₂ O.

The upstream section can advantageously prevent direct physical contact with the upstream end of the aerosol-generating substrate. In particular, where the aerosol-generating substrate includes a susceptor element, the upstream section may prevent direct physical contact with the upstream end of the susceptor element. This helps prevent displacement or deformation of the susceptor element during handling or transport of the aerosol-generating article. This in turn helps fix the shape and position of the susceptor element. Also, the presence of an upstream section can help prevent any loss of the substrate, which can be beneficial, for example if the substrate contains particulate plant material.

The upstream section may also provide an improved appearance to the upstream end of the aerosol-generating article. Also, if desired, the upstream section may be used to provide information about the aerosol-generating article, eg, the brand, flavor, strength, or details of the aerosol-generating device for which the article is intended to be used.

The upstream section may include a porous plug element. The porous plug element has a porosity of at least about 50% in the longitudinal direction of the aerosol-generating article. More preferably, the porous plug element has a porosity of about 50% to about 90% in the longitudinal direction. The porosity of a porous plug element in the longitudinal direction is defined as the ratio of the cross-sectional area of the material forming the porous plug element to the internal cross-sectional area of the aerosol-generating article at the location of the porous plug element.

The porous plug element may be made of a porous material or may include a plurality of openings. This can be achieved, for example, through laser drilling. It is preferred that the plurality of openings are uniformly distributed throughout the cross-section of the porous plug element.

The porosity or permeability of the upstream section can be advantageously varied to provide the desired overall resistance to draw of the aerosol-generating article.

In an alternative embodiment, the upstream section may be formed from a material that is impervious to air. In such embodiments, the aerosol-generating article may be configured such that air flows into the rod of the aerosol-generating substrate through suitable ventilation means provided in the wrapper.

The upstream section may be made of any material suitable for use in an aerosol-generating article. For example, the upstream element may include a plug of material. Suitable materials for forming the upstream section include filter materials, ceramics, polymeric materials, cellulose acetate, cardboard, zeolites or aerosol-generating substrates. Preferably, the upstream section includes a plug comprising cellulose acetate.

Where the upstream section includes a plug of material, the downstream end of the plug of material may be around the upstream end of the aerosol-generating substrate. For example, the upstream section may include a plug comprising cellulose acetate bordering the upstream end of the aerosol-generating substrate. This can advantageously help hold the aerosol-generating substrate in place.

Where the upstream section comprises a plug of material, the downstream end of the plug of material may be spaced apart from the upstream end of the aerosol-generating substrate. The upstream element may include a plug comprising a fibrous filtering material.

Preferably, the upstream section is formed of a heat-resistant material. For example, the upstream section is preferably formed of a material resistant to temperatures of up to 350°C. This ensures that the upstream section is not adversely affected by the heating means for heating the aerosol-generating substrate.

Preferably, the upstream section has a diameter approximately equal to the diameter of the aerosol-generating article.

The upstream section may have a length of at least about 1 mm. For example, the upstream section can have a length of at least about 2 mm, at least about 4 mm, or at least about 6 mm.

The upstream section may have a length of about 15 mm or less. For example, the upstream section may have a length of about 12 mm or less, about 10 mm or less, or about 8 mm or less.

The upstream section may have a length of about 1 mm to about 15 mm. For example, the upstream section may have a length of about 2 mm to about 12 mm, about 4 mm to about 10 mm, or about 6 mm to about 8 mm.

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

The upstream section preferably has a substantially uniform structure. For example, the upstream section may be substantially uniform in texture and appearance. The upstream section may, for example, have a continuous and regular surface over its entire cross-section. The upstream section may not have appreciable symmetry, for example.

The upstream section may include a second tubular element. A second tubular element may be provided in place of the upstream element. The second tubular element may be provided immediately upstream of the aerosol-generating substrate. The second tubular element may abut the aerosol-generating substrate.

The second tubular element may include a tubular body defining a cavity extending from a first upstream end of the tubular body to a second downstream end of the tubular body. The second tubular element may also include a folded end forming a first end wall at the first upstream end of the tubular body. The first end wall may define an opening allowing air flow between the cavity and the exterior of the second tubular element. Preferably, air can flow from the cavity through the opening into the aerosol-generating substrate.

The second tubular element may include a second end wall at a second end of its tubular body. This second end wall can be formed by folding the end of the second tubular element at the second downstream end of the tubular body. The second end wall may define an opening, which may also allow airflow between the cavity and the exterior of the second tubular element. In the case of the second end wall, the opening may be configured to allow air to flow from the outside of the aerosol-generating article through the opening into the cavity. Thus, the opening may provide a conduit through which air may be drawn into the aerosol-generating article and through the aerosol-generating substrate.

The upstream section is preferably surrounded by a wrapper. The wrapper surrounding the upstream section is preferably a rigid plug wrap, eg, a plug wrap having a basis weight of at least about 80 g/m² (gsm), or at least about 100 gsm, or at least about 110 gsm. This provides structural rigidity to the upstream section.

As noted above, the present invention relates to an aerosol-generating system comprising an aerosol-generating device having a distal end and a mouth end. The aerosol-generating device includes a body. The body or housing of the aerosol-generating device defines a device cavity for removably receiving an aerosol-generating article at the mouth end of the device. The aerosol-generating device includes a heating element or heater for heating the aerosol-forming substrate when the aerosol-generating article is received within the device cavity.

The device cavity may be referred to as the heating chamber of the aerosol-generating device. The device cavity may extend between the distal end and the mouse, or proximal, end. The distal end of the device cavity may be a closed end and the mouth, or proximal, end of the device cavity may be an open end. The aerosol-generating article may be inserted through the open end of the device cavity, into the device cavity, or into the heating chamber. The device cavity may be cylindrical in shape to conform to the same shape of the aerosol-generating article.

The expression “contained within” may refer to the fact that an element or element is fully or partially contained within another element or element. For example, the expression "an aerosol-generating article is received within a device cavity" refers to the aerosol-generating article being fully or partially contained within the device cavity of the aerosol-generating article. When the aerosol-generating article is received within the device cavity, the aerosol-generating article may abut the distal end of the device cavity. When the aerosol-generating article is received within the device cavity, the aerosol-generating article may be substantially proximate to the distal end of the device cavity. The distal end of the device cavity may be defined by an end wall.

The length of the device cavity may be from about 10 mm to about 50 mm. The length of the device cavity may be from about 20 mm to about 40 mm. The length of the device cavity may be from about 25 mm to about 30 mm. The length of the device cavity (or heating chamber) may be equal to or greater than the length of the rod of the aerosol-forming substrate.

The device cavity may have a diameter of about 4 mm to about 50 mm. The diameter of the device cavity may be from about 4 mm to about 30 mm. The device cavity may have a diameter of about 5 mm to about 15 mm. The device cavity may have a diameter of about 6 mm to about 12 mm. The device cavity may have a diameter of about 7 mm to about 10 mm. The device cavity may have a diameter of about 7 mm to about 8 mm.

The diameter of the device cavity may be equal to or greater than the diameter of the aerosol-generating article. The diameter of the device cavity may be the same as the diameter of the aerosol-generating article to establish an interference fit with the aerosol-generating article.

The device cavity may be configured to establish an interference fit with an aerosol-generating article received within the device cavity. The interference fit may refer to a snug fit. The aerosol-generating device may include a peripheral wall. This peripheral wall may define a device cavity, or heating chamber. The peripheral wall defining the device cavity may be configured to engage an aerosol-generating article received within the device cavity in an interference fit manner such that when received within the device cavity there is substantially a gap between the peripheral wall defining the device cavity and the aerosol-generating article. or no empty space

This interference fit can establish a gastight fit or configuration between the device cavity and the aerosol-generating article received therein.

In this airtight configuration, there will be substantially no gaps or voids between the aerosol-generating article and the peripheral wall defining the device cavity for air to flow.

An interference fit with the aerosol-generating article may be established along the entire length of the device cavity or along a portion of the length of the device cavity.

The aerosol-generating device may include an airflow channel extending between the channel inlet and the channel outlet. The airflow channel may be configured to establish fluid communication between the interior of the device cavity and the exterior of the aerosol-generating device. Airflow channels of the aerosol-generating device may be defined within the housing of the aerosol-generating device to enable fluid communication between the interior of the device cavity and the exterior of the aerosol-generating device. When an aerosol-generating article is received within the device cavity, the airflow channels can be configured to provide airflow into the article for delivery to a user who inhales the generated aerosol from the mouth end of the article.

The airflow channels of the aerosol-generating device may be defined in or by a peripheral wall of the housing of the aerosol-generating device. That is, the airflow channels of the aerosol-generating device may be defined within the thickness of the perimeter wall or by the inner surface of the perimeter wall, or a combination of both. The airflow channels may be defined in part by the inner surface of the perimeter wall and in part within the thickness of the perimeter wall. The inner surface of the peripheral wall defines the peripheral boundary of the device cavity.

The airflow channel of the aerosol-generating device may extend from an inlet located at the mouth or proximal end of the aerosol-generating device to an outlet located away from the mouth end of the device. The airflow channel may extend along a direction parallel to the longitudinal axis of the aerosol-generating device.

The aerosol-generating device may include an elongate heater (or heating element) arranged to be inserted into the aerosol-generating article when the aerosol-generating article is received within the device cavity. An elongate heater may be arranged with the device cavity. An elongate heater may extend into the cavity. Alternative heating devices are discussed further below.

The heater may be any suitable type of heater. Preferably, the heater is an external heater.

Preferably, the heater is capable of externally heating the aerosol-generating article when housed within the aerosol-generating article. Such an external heater may be inserted within the aerosol-generating device or enclose the aerosol-generating article when received within the aerosol-generating device. Preferably, the heater may be configured to externally heat the aerosol-generating article when received within the aerosol-generating article. Such an external heater may be configured to enclose the aerosol-generating article when inserted within or received within the aerosol-generating device.

In some embodiments, the heater is arranged to heat an outer surface of the aerosol-forming substrate. In some embodiments, the heater is arranged to be inserted into the aerosol-forming substrate when the aerosol-forming substrate is received within the cavity. The heater may be located in the device cavity or inside the heating chamber.

The heater may include at least one heating element. The at least one heating element may be any suitable type of heating element. In some embodiments, the device includes only one heating element. In some embodiments, the device includes a plurality of heating elements. The heater may include at least one resistive heating element. Preferably, the heater includes a plurality of resistive heating elements. Preferably, the resistive heating elements are electrically connected in a parallel arrangement. Advantageously, providing a plurality of resistive heating elements electrically connected in a parallel arrangement can facilitate delivery of the desired power to the heater while reducing or minimizing the voltage required to provide the desired power. Advantageously, reducing or minimizing the voltage required to operate the heater may facilitate reducing or minimizing the physical size of the power supply.

Suitable materials for forming the at least one resistive heating element include semiconductors such as doped ceramics, electrical 'conductive' ceramics (eg, molybdenum disilicide, etc.), carbon, graphite, metals, metal alloys, and ceramic and metal materials. Composites made of, but not limited to. Such composite materials may include doped ceramics or undoped ceramics. A suitable example of a doped ceramic includes doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum and metals of the platinum group. Examples of suitable metal alloys are stainless steel, nickel-, cobalt-, chromium-, aluminum-, titanium-, zirconium-, hafnium-, niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese- , and iron-containing alloys, and nickel, iron, cobalt, stainless steel, Timetal® based superalloys and iron-manganese-aluminum based alloys.

In some implementations, the at least one resistive heating element includes one or more stamped portions of electrically resistive material, such as stainless steel. Alternatively, the at least one resistive heating element may comprise a heating wire or filament, for example a Ni-Cr (nickel-chromium), platinum, tungsten or alloy wire.

In some embodiments, the at least one heating element comprises an electrically insulative substrate and the at least one resistive heating element is provided on the electrically insulative substrate.

The electrically insulative substrate may include any suitable material. For example, the electrically insulative substrate may include one or more of paper, glass, ceramic, anodized metal, coated metal, and polyimide. The ceramic may include mica, alumina (Al2O3) or zirconia (ZrO2). Preferably, the electrically insulative substrate has a thermal conductivity of about 40 W/m.K or less, preferably about 20 W/m.K or less, and ideally about 2 W/m.K or less.

The heater may include a heating element comprising a rigid electrically insulative substrate having one or more electrically conductive tracks or wires disposed on its surface. The size and shape of the electrically insulative substrate allows the electrically insulative substrate to be directly inserted into the aerosol-forming substrate. If the electrically insulative substrate is not sufficiently rigid, the heating element may include additional reinforcing means. Current may pass through one or more electrically conductive tracks to heat the heating element and the aerosol-forming substrate.

In some embodiments, the heater includes an induction heating arrangement. The induction heating apparatus may include an inductor coil and a power supply configured to provide a high frequency oscillating current to the inductor coil. As used herein, high frequency oscillating current means an oscillating current having a frequency between about 500 kHz and about 30 MHz. The heater may advantageously include a DC/AC inverter for converting DC current supplied by the DC power supply to alternating current. The inductor coil may be arranged to generate a high frequency oscillating electromagnetic field when receiving a high frequency oscillating current from the power supply. The inductor coil may be arranged to generate a high frequency oscillating electromagnetic field within the device cavity. In some implementations, the inductor coil can substantially surround the device cavity. The inductor coil may extend at least partially along the length of the device cavity.

The heater may include an induction heating element. The induction heating element may be a susceptor element. As used herein, the term 'susceptor element' refers to an element comprising a material capable of converting electromagnetic energy into heat. When the susceptor element is placed in an alternating electromagnetic field, the susceptor heats up. Heating of the susceptor element may be the result of at least one of hysteresis losses or eddy currents induced in the susceptor, depending on the electrical and magnetic properties of the susceptor material.

The susceptor element may be arranged such that, when the aerosol-generating article is received within the cavity of the aerosol-generating device, an oscillating electromagnetic field generated by the inductor coil induces a current in the susceptor element and heats the susceptor element. In these embodiments, the aerosol-generating device fluctuates with a magnetic field strength (H-field strength) of preferably 1 to 5 kA/m, preferably 2 to 3 kA/m, for example about 2.5 kA/m. It can generate an electromagnetic field. The electrically operated aerosol-generating device is preferably capable of generating a fluctuating electromagnetic field having a frequency between 1 and 30 MHz, for example between 1 and 10 MHz, for example between 5 and 7 MHz.

In some embodiments, the susceptor element is located on the aerosol-generating article. In these embodiments, the susceptor element is preferably positioned in contact with the aerosol-forming substrate. The susceptor element may be located on the aerosol-forming substrate.

In some embodiments, the susceptor element is located on the aerosol-generating device. In these embodiments, the susceptor element may be located within the cavity. The aerosol-generating device may include only one susceptor element. The aerosol-generating device may include a plurality of susceptor elements.

In some embodiments, the susceptor element is arranged to heat an outer surface of the aerosol-forming substrate. In some embodiments, the susceptor element is arranged to be inserted into the aerosol-forming substrate when the aerosol-forming substrate is received within the cavity.

The susceptor element may include any suitable material. The susceptor element may be formed of any material that can be inductively heated to a temperature sufficient to release volatile compounds from the aerosol-forming substrate. Suitable materials for elongated susceptor elements include graphite, molybdenum, silicon carbide, stainless steel, niobium, aluminum, nickel, nickel-containing compounds, titanium, and composites of metallic materials. Some susceptor elements contain metal or carbon. Advantageously, the susceptor element may comprise or consist of ferromagnetic materials such as ferritic iron, ferromagnetic alloys such as ferromagnetic steel or stainless steel, ferromagnetic particles, and ferrite. Suitable susceptor elements may be or include aluminum. The susceptor element preferably contains more than 5%, preferably more than 20%, more preferably more than 50% or more than 90% ferromagnetic or paramagnetic material. Some elongated susceptor elements can be heated to temperatures in excess of about 250°C.

The susceptor element may include a non-metallic core with a metal layer disposed on the non-metallic core. For example, the susceptor element may include a ceramic core or metal tracks formed on the outer surface of the substrate.

In some embodiments, the aerosol-generating device can include at least one resistive heating element and at least one induction heating element. In some embodiments, an aerosol-generating device can include a combination of resistive heating elements and induction heating elements.

During use, the heater can be controlled to operate in a defined operating temperature range below the maximum operating temperature. An operating temperature range of about 150° C. to about 300° C. within the heating chamber (or device cavity) is preferred. The operating temperature range of the heater may be from about 150 °C to about 250 °C.

Preferably, the operating temperature range of the heater may be from about 150 °C to about 200 °C. More preferably, the operating temperature range of the heater may be from about 180 °C to about 200 °C. In particular, when using an aerosol-generating device with an external heater having an operating temperature range of about 180° C. to about 200° C., as described throughout this disclosure, having a relatively low RTD (eg, less than 10 mmH ₂ O It has been found that optimal and consistent aerosol delivery can be achieved with an aerosol-generating article (with an RTD).

In embodiments where the aerosol-generating article includes a ventilation zone at a location along the downstream section or hollow tubular element, the ventilation zone may be arranged to be exposed when the aerosol-generating article is received within the device cavity. Thus, the length of the device cavity may be less than the distance of the upstream end of the aerosol-generating article to the ventilation zone located along the downstream section.

The aerosol-generating device may include a power supply. The power supply may be a DC power supply. In some implementations, the power supply is a battery. The power supply may be a nickel-hydrogen alloy battery, a nickel cadmium battery, or a lithium-based battery such as a lithium-cobalt, lithium-iron-phosphate or lithium-polymer battery. However, in some implementations, the power supply may be another form of charge storage device such as a capacitor. The power supply may require recharging and may have a capacity allowing storage of sufficient energy for one or more user actions, eg, one or more aerosol generating experiences. For example, the power supply may have sufficient capacity to allow continuous heating of the aerosol-forming substrate for a period of about 6 minutes, corresponding to the typical time taken to smoke a conventional cigarette, or for a doubling period of 6 minutes. can In another example, the power supply may have sufficient capacity to allow activation of a predetermined number of puffs or discrete heaters.

The aerosol-generating article may have a length of about 35 mm to about 100 mm.

Preferably, the overall length of an aerosol-generating article according to the present invention is at least about 38 mm. More preferably, the overall length of an aerosol-generating article according to the present invention is at least about 40 mm. Even more preferably, the overall length of an aerosol-generating article according to the present invention is at least about 42 mm.

The overall length of an aerosol-generating article according to the invention is preferably equal to or less than 70 mm. More preferably, the overall length of the aerosol-generating article according to the invention is preferably equal to or less than 60 mm. Even more preferably, the overall length of the aerosol-generating article according to the invention is preferably equal to or less than 50 mm.

In some embodiments, the overall length of the aerosol-generating article is preferably from about 38 mm to about 70 mm, more preferably from about 40 mm to about 70 mm, and even more preferably from about 42 mm to about 70 mm. In another embodiment, the overall length of the aerosol-generating article is preferably from about 38 mm to about 60 mm, more preferably from about 40 mm to about 60 mm, and even more preferably from about 42 mm to about 60 mm. In a further embodiment, the overall length of the aerosol-generating article is preferably from about 38 mm to about 50 mm, more preferably from about 40 mm to about 50 mm, and even more preferably from about 42 mm to about 50 mm. In some embodiments, the overall length of the aerosol-generating article is about 45 mm.

The aerosol-generating article has an outer diameter of at least 5 mm. Preferably, the aerosol-generating article has an outer diameter of at least 6 mm. More preferably, the aerosol-generating article has an outer diameter of at least 7 mm.

Preferably, the aerosol-generating article has an outer diameter of about 12 mm or less. More preferably, the aerosol-generating article has an outer diameter of about 10 mm or less. Even more preferably, the aerosol-generating article has an outer diameter of about 8 mm or less.

In some embodiments, the aerosol-generating article has an outer diameter of about 5 mm to about 12 mm, preferably about 6 mm to about 12 mm, more preferably about 7 mm to about 12 mm. In another embodiment, the aerosol-generating article has an outer diameter of about 5 mm to about 10 mm, preferably about 6 mm to about 10 mm, more preferably about 7 mm to about 10 mm. In a further embodiment, the aerosol-generating article has an outer diameter of about 5 mm to about 8 mm, preferably about 6 mm to about 8 mm, more preferably about 7 mm to about 8 mm.

One or more of the components of the aerosol-generating article may be individually surrounded by a wrapper. In a preferred embodiment, all components of the aerosol-generating article are individually enclosed by their own wrappers. Preferably, at least one of the components of the aerosol-generating article is wrapped with a hydrophobic wrapper.

The term “hydrophobic” describes a surface that exhibits water repellency. One useful way to determine hydrophobicity is to measure the water contact angle. "Water contact angle" is the angle at which a liquid/vapor interface meets a solid surface, commonly measured through a liquid. The water contact angle quantifies the wettability of a solid surface by a liquid in terms of Young's equation. Hydrophobicity, or water contact angle, is measured using the TAPPI T558 test method, and the result is expressed as an interfacial contact angle, reported in “degrees,” and can range from approximately zero to approximately 180 degrees.

In a preferred embodiment, the hydrophobic wrapper is one comprising a paper layer having a water contact angle of greater than about 30 degrees, preferably greater than about 35 degrees, or greater than about 40 degrees, or greater than about 45 degrees.

As an example, the paper layer may include PVOH (polyvinyl alcohol) or silicone. PVOH may be applied to the paper layer as a surface coating, or the paper layer may include a surface treatment comprising PVOH or silicone.

In a particularly preferred embodiment, an aerosol-generating article according to the present disclosure comprises, in a linear sequential arrangement, an aerosol-generating element comprising a rod comprising an aerosol-generating substrate and a hollow tubular element positioned immediately downstream of the aerosol-generating element.

More specifically, the hollow tubular element may abut the aerosol-generating element.

The aerosol-generating article has a substantially cylindrical shape and an outer diameter of about 7.3 mm.

The hollow tubular element is in the form of a hollow cellulose acetate tube and has an inner diameter of about 7.1 mm. Thus, the thickness of the peripheral wall of the hollow tubular element is about 0.1 mm. Ventilation zones are provided at locations along the hollow tubular elements.

The aerosol-generating element is in the form of a rod of aerosol-generating substrate surrounded by a paper wrapper and comprises at least one of the types of aerosol-generating substrate described above, such as plant cut filler, in particular tobacco cut filler, homogenized tobacco, gel formulations or particles of plants other than tobacco. It contains homogenized plant material that

The outer tipping wrapper surrounds the hollow tubular element and a portion of the aerosol-generating element, thereby attaching the hollow tubular element to the aerosol-generating element.

The rod of the aerosol-generating substrate has a length of about 12 mm and the hollow tubular element has a length of about 33 mm. Thus, the overall length of the aerosol-generating article is about 45 mm.

In another preferred embodiment, an aerosol-generating article according to the present disclosure comprises an upstream element, an aerosol-generating element located immediately downstream of the upstream element, an aerosol-generating element comprising a rod comprising an aerosol-generating substrate, and an aerosol-generating element, in a linear sequential arrangement. It includes a hollow tubular element located immediately downstream of the generating element.

More specifically, the rod of the aerosol-generating substrate may abut the upstream element. Additionally, the hollow tubular element may abut the aerosol-generating element.

The aerosol-generating article has a substantially cylindrical shape and an outer diameter of about 7.3 mm.

The hollow tubular element is in the form of a hollow cellulose acetate tube and has an inner diameter of about 7.1 mm. Thus, the thickness of the peripheral wall of the hollow tubular element is about 0.1 mm. Ventilation zones are provided at locations along the hollow tubular elements.

The aerosol-generating element is in the form of a rod of aerosol-generating substrate surrounded by a paper wrapper and comprises at least one of the types of aerosol-generating substrate described above, such as plant cut filler, in particular tobacco cut filler, homogenized tobacco, gel formulations or particles of plants other than tobacco. It contains homogenized plant material that

The outer tipping wrapper surrounds the hollow tubular element and a portion of the aerosol-generating element, thereby attaching the hollow tubular element to the aerosol-generating element.

The upstream element has a length of 5 mm, the rod of the aerosol-generating substrate has a length of about 12 mm, and the hollow tubular element has a length of about 28 mm. Thus, the overall length of the aerosol-generating article is about 45 mm.

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 embodiments may be combined with any one or more features of any other embodiment, embodiment, or aspect described herein.

Example 1. An aerosol-generating system comprising:

An aerosol-generating article for generating an inhalable aerosol when heated, the aerosol-generating article extending from the mouth end to the distal end,

aerosol-generating elements; and

a downstream section located downstream of the aerosol-generating element, the downstream section extending from a downstream end of the aerosol-generating element to a mouth end of the aerosol-generating article;

wherein the downstream section comprises a hollow tubular element, wherein the downstream section has a resistance to draw of less than about 10 mmH ₂ O;

and an aerosol-generating device having a distal end and a mouth end, wherein the aerosol-generating device comprises:

a body extending from the distal end to the mouth end, the body defining a device cavity for removably receiving the aerosol-generating article at the mouth end of the device; and

An aerosol-generating device comprising a heater for heating the aerosol-generating article when the aerosol-generating article is received within the device cavity.

Example 2. The aerosol-generating system of example 1, wherein the hollow tubular element of the aerosol-generating article extends from the downstream end of the aerosol-generating element to the mouth end of the aerosol-generating article.

Embodiment 3. The aerosol-generating system of embodiment 1 or 2, wherein the heater of the aerosol-generating device is configured to enclose the aerosol-generating article when the aerosol-generating article is received within the device cavity.

Example 4. The aerosol-generating system according to any one of the preceding embodiments, wherein the operating temperature of the heater is between 180°C and 200°C.

Embodiment 5. The aerosol-generating system according to any one of the preceding embodiments, wherein the downstream section comprises a ventilation zone at a location along the hollow tubular element.

Example 6. The aerosol-generating system of example 5, wherein the distance between the ventilation zone and the mouth end of the aerosol-generating article is less than about 25 mm.

Embodiment 7. The aerosol-generating system of embodiment 5 or 6, wherein the distance between the ventilation zone and the mouth end of the aerosol-generating article is at least about 10 mm.

Embodiment 8. The aerosol-generating system according to any of embodiments 5, 6 and 7, wherein the ventilation zone is arranged to be exposed when the aerosol-generating article is received within the device cavity.

Example 9. The aerosol-generating system of any one of the preceding embodiments, wherein the aerosol-generating article has a ventilation level of at least about 10%.

Example 10. The aerosol-generating system according to any of the preceding embodiments, wherein the aerosol-generating element has a length of about 10 mm to about 20 mm.

Example 11. An aerosol-generating system according to any of the preceding embodiments, wherein the aerosol-generating element comprises a tobacco cut filler.

Example 12. An aerosol-generating system according to any one of the preceding embodiments, wherein the aerosol former content in the aerosol-generating element is at least about 10% by weight.

Example 13. The aerosol-generating system according to any one of the preceding embodiments, wherein the hollow tubular element has a length of at least about 25 mm and a cross-section of the hollow tubular element is substantially constant.

Example 14. The aerosol-generating system according to any one of the preceding embodiments, wherein the hollow tubular element has a peripheral wall thickness of less than about 1.5 mm.

Example 15. An aerosol-generating system according to any of the preceding embodiments, wherein the hollow tubular element defines an unobstructed airflow path extending from the downstream end of the aerosol-generating element to the downstream end of the downstream section.

In the following, the invention will be further explained with reference to the accompanying drawings, wherein:
1 shows a schematic cross-sectional side view of an aerosol-generating article according to one embodiment of the present invention;
2 shows a schematic cross-sectional side view of another aerosol-generating article according to another embodiment of the present invention;
Figure 3 shows a schematic cross-sectional side view of a variant of the aerosol-generating article of Figure 1;
Figure 4 shows a schematic cross-sectional side view of a variant of the aerosol-generating article of Figure 2; and
5 shows a schematic cross-sectional side view of a mouth end portion of an exemplary aerosol-generating device and system, wherein the aerosol-generating article shown in FIG. 1 is housed within the aerosol-generating device.

The aerosol-generating article 10 shown in FIG. 1 includes a rod 12 of an aerosol-generating substrate 12 and a downstream section 14 at a position downstream of the rod 12 of the aerosol-generating substrate. Accordingly, the aerosol-generating article 10 extends from an upstream or distal end 16 substantially coincident with the upstream end of the rod 12 to a downstream or mouth end 18 coincident with the downstream end of the downstream section 14. do.

The aerosol-generating article 10 has an overall length of about 45 mm.

The rod of the aerosol-generating substrate 12 comprises tobacco cut filler impregnated with about 12% by weight of an aerosol former, such as glycerin. Tobacco cut filler contains 90% by weight of tobacco leaf blades. The cutting width of the tobacco cut filler is about 0.7 mm. The load of aerosol-generating substrate 12 contains approximately 130 mg of tobacco cut filler.

The downstream section 14 includes a hollow tubular element 20 located immediately downstream of the rod 12 of the aerosol-generating substrate, the hollow tubular element 20 being longitudinally aligned with the rod 12 . In the embodiment of FIG. 1 , the upstream end of the hollow tubular element 20 abuts the upstream end of the rod 12 of the aerosol-generating substrate.

The hollow tubular element 20 defines a hollow section of the aerosol-generating article 10 . The hollow tubular element does not substantially contribute to the overall RTD of the aerosol-generating article. More specifically, the RTD of the downstream section is about 0 mm H ₂ O.

The hollow tubular element 20 is provided in the form of a hollow cylindrical tube made of cellulose acetate, or rigid paper such as paper having a basis weight (basic weight) of at least about 90 g/m2. The hollow tubular element 20 defines an internal cavity 22 that extends completely from the upstream end 24 of the hollow tubular segment to the downstream end 26 of the hollow tubular element 20 . The interior cavity 22 is substantially empty, thus enabling substantially unrestricted airflow along the interior cavity 22 . The hollow tubular element 20 does not substantially contribute to the overall RTD of the aerosol-generating article 10 .

The hollow tubular element 20 has a length of about 33 mm, an outer diameter D _E of about 7.3 mm, and an inner diameter D _I of about 7.1 mm. Thus, the thickness of the peripheral wall of the hollow tubular element 20 is about 0.1 mm.

The aerosol-generating article 10 includes a ventilation zone 30 provided at a location along the hollow tubular element 20 . More specifically, the ventilation zone 30 is provided about 18 mm from the downstream end 26 of the hollow tubular element 20 . As such, in the embodiment of FIG. 1 , the ventilation zone 30 is provided effectively 18 millimeters from the mouth end 18 of the aerosol-generating article 10 . The ventilation level of the aerosol-generating article 10 is about 40%.

In the embodiment of FIG. 1 , the aerosol-generating article does not include any additional components upstream of the rod of the aerosol-generating substrate 12 or downstream of the hollow tubular segment 20 .

The aerosol-generating article 100 shown in FIG. 2 differs from the aerosol-generating article 10 described above only by the provision of an upstream section at an upstream position of the aerosol-generating element. Accordingly, the aerosol-generating article 100 will only be described, differing from the aerosol-generating article 10 .

At the top of the rod 12 of the aerosol-generating substrate and the downstream section 14 at a location downstream of the rod 12, the aerosol-generating article 100 passes through the upstream section 40 at a location upstream of the rod 12. contains Thus, the aerosol-generating article 10 can be formed from a distal end 16 substantially coincident with the upstream end of the upstream section 40 to a mouth end substantially coincident with the downstream end of the downstream section 14 or a downstream end 18 ) is extended to

The upstream section 40 includes an upstream element 42 located immediately upstream of the rod 12 of the aerosol-generating substrate, the upstream element 42 being longitudinally aligned with the rod 12 . In the embodiment of FIG. 2 , the downstream end of the upstream element 42 abuts the upstream end of the rod 12 of the aerosol-generating substrate. The upstream element 42 is provided in the form of a cylindrical plug of cellulose acetate surrounded by a rigid wrapper. Upstream element 42 has a length of about 5 mm. The RTD of the upstream element 42 is about 30 mm H ₂ O.

3 shows an aerosol-generating article 200 that is a variation of the aerosol-generating article 10 described above. The aerosol-generating article 200 is the aerosol-generating article of the embodiment of FIG. 1 , except that the aerosol-generating article 200 of the first embodiment variant does not include the cylindrical hollow tubular element 22 as described above. (10) is generally the same. Instead, the aerosol-generating article 200 of the variant of the first embodiment comprises a modified tubular element 220 located immediately downstream of the aerosol-generating element 12 .

The deformed tubular element 220 includes a tubular body 222 defining a cavity 224 extending from a first end of the tubular body 222 to a second end of the tubular body 222 . The deformed tubular element 220 also includes a folded end portion forming a first end wall 226 at the first end of the tubular body 222 . The first end wall 226 defines an opening 228 that allows air flow between the cavity 224 and the exterior of the deformed tubular element 220 . In particular, the embodiment of FIG. 3 is configured to allow aerosol to flow from the aerosol-generating element 12 through the aperture 228 into the cavity 224 .

Much like cavity 22 of the first embodiment shown in FIG. 1 , cavity 224 of tubular body 222 is substantially empty, so that substantially unrestricted airflow is energized along cavity 222 . As a result, the RTD of the deformed tubular element 220 can be localized at a particular longitudinal location of the deformed tubular element 220, ie at the first end wall 226 and at the first end wall 226 and It can be controlled through the selected configuration of its corresponding opening 228 .

In the embodiment of FIG. 3 , the deformed tubular element 220 has a length of about 33 mm, an outer diameter D _E of about 7.3 mm, and an inner diameter D _FTS of about 7.1 mm. Thus, the thickness of the peripheral wall of the tubular element 222 is about 0.1 mm.

4 shows an aerosol-generating article 300 that is a variation of the aerosol-generating article 100 described above. The aerosol-generating article 300 is shown in FIG. 3, except that the aerosol-generating article 300 of the variant of the second embodiment does not include an upstream element 42 provided in the form of a cylindrical plug of cellulose acetate surrounded by a rigid wrapper. It is generally the same as the aerosol-generating article 100 of embodiment 2. Instead, the aerosol-generating article 300 of the variant of the second embodiment comprises a second tubular element 44 located immediately upstream of the aerosol-generating element 12 . Consequently, in this variant of the second embodiment, the hollow tubular element 20 located immediately downstream of the aerosol-generating element 12 can be referred to as the first tubular element 20 .

The second tubular element 44 includes a tubular body 46 defining a cavity 48 extending from a first end of the tubular body 46 to a second end of the tubular body 46 . The second tubular element 44 also includes a folded end portion forming a first end wall 50 at the first end of the tubular body 46 . The first end wall 50 defines an opening 52 allowing air flow between the cavity 48 and the exterior of the second tubular element 44 . In particular, the embodiment of FIG. 4 is configured to allow air to flow from cavity 48 through aperture 52 into aerosol-generating element 12 .

The second tubular element 44 also includes a second end wall 54 at the second end of its tubular body 46 . This second end wall 54 is formed by folding the distal portion of the second tubular element 44 at the second end of the tubular body 46 . The second end wall 54 bounds the opening 56, which also allows airflow between the cavity 48 and the exterior of the second tubular element 44. In the case of the second end wall 54 , the opening 56 is configured to allow air to flow from the outside of the aerosol-generating article 300 through the opening 56 into the cavity 48 . Thus, opening 56 provides a conduit through which air can be drawn into aerosol-generating article 300 and through aerosol-generating element 12 .

In the variant of FIG. 4 , the upstream end of the second tubular element 44 abuts the upstream end of the rod 12 of the aerosol-generating substrate. The second tubular element 44 has a length of about 5 mm. The RTD of the second tubular element 44 is about 30 mmH ₂ O.

FIG. 5 shows an aerosol-generating system 1000 comprising the aerosol-generating device 1 and aerosol-generating article 10 shown in FIG. 1 . 5 shows a downstream, mouth end portion of the aerosol-generating device 1 , in which a device cavity is defined and an aerosol-generating article 10 can be received. The aerosol generating device 1 includes a housing (or body) 4 extending between a mouth end 2 and a distal end (not shown). The housing 4 comprises a peripheral wall 6 . The peripheral wall 6 defines a device cavity for receiving an aerosol-generating article 10 . The device cavity is defined by a closed distal end and an open mouth end. The mouth end of the device cavity is positioned at the mouth end of the aerosol-generating device 1 . The aerosol-generating article 10 is configured to be received through the mouth end of the device cavity and is configured to abut the closed end of the device cavity.

A device airflow channel 5 is defined in the perimeter wall 6 . An airflow channel 5 extends between the inlet 7 located at the mouth end of the aerosol-generating device 1 and the closed end of the device cavity. Air may enter the aerosol-generating substrate 12 through an aperture provided at the closed end of the device cavity to ensure fluid communication between the airflow channel 5 and the aerosol-generating substrate 12 .

The aerosol generating device 1 further includes a heater (not shown) and a power source (not shown) for supplying power to the heater. A controller (not shown) is also provided to control the supply of power to the heater. The heater is configured to heat the aerosol-generating article 10 during use when the aerosol-generating article 1 is received within the device 1 . The heater is arranged to externally heat the aerosol-generating substrate 12 for optimum aerosol generation. The ventilation zone 30 is arranged to be exposed when the aerosol-generating article 10 is received within the aerosol-generating device 1 .

For purposes of this description and appended claims, unless otherwise indicated, all numbers expressing amounts, quantities, percentages, etc., are to be understood as being modified in all instances by the term "about." Also, all ranges are inclusive of the disclosed maximum and minimum points and include therein any intermediate ranges that may or may not be specifically recited herein. Accordingly, in this context, the number A is understood as A ± 10% of A. In this context, the number A may be considered to include a numerical value that is within the usual standard error for measurement of the property that the number A modifies. In some instances used in the appended claims, the number A may deviate by the above-recited percentages, provided that the amount of deviation from A does not materially affect the basic and novel feature(s) of the claimed invention. Also, all ranges are inclusive of the disclosed maximum and minimum points and include therein any intermediate ranges that may or may not be specifically recited herein.

Claims (15)

As an aerosol generating system,
An aerosol-generating article for generating an inhalable aerosol when heated, the aerosol-generating article extending from the mouth end to the distal end,
aerosol generating elements; and
a downstream section located downstream of the aerosol-generating element, the downstream section extending from a downstream end of the aerosol-generating element to a mouth end of the aerosol-generating article;
wherein the downstream section comprises a hollow tubular element, wherein the downstream section has a resistance to draw of less than about 10 mmH ₂ O;
and
An aerosol-generating device having a distal end and a mouth end, the aerosol-generating device comprising:
a body extending from the distal end to the mouth end, the body defining a device cavity for removably receiving the aerosol-generating article at the mouth end of the device; and
a heater for heating the aerosol-generating element when the aerosol-generating article is received within the device cavity, wherein the heater is configured to externally heat the aerosol-generating article when received within the aerosol-generating device. , an aerosol-generating system comprising the aerosol-generating device. 2. An aerosol-generating system according to claim 1, wherein the hollow tubular element of the aerosol-generating article extends from the downstream end of the aerosol-generating element to the mouth end of the aerosol-generating article. 3. An aerosol-generating system according to claim 1 or 2, wherein the heater of the aerosol-generating device is configured to enclose the aerosol-generating article when the aerosol-generating article is received within the device cavity. 4. An aerosol-generating system according to any one of claims 1 to 3, wherein the operating temperature of the heater is from about 180 °C to about 200 °C. 5. An aerosol-generating system according to any preceding claim, wherein the downstream section comprises a ventilation zone at a location along the hollow tubular element. 6. The aerosol-generating system of claim 5, wherein the distance between the ventilation zone and the mouth end of the aerosol-generating article is less than about 25 mm. 7. An aerosol-generating system according to claim 5 or 6, wherein the distance between the ventilation zone and the mouth end of the aerosol-generating article is at least about 10 mm. 8. An aerosol-generating system according to any one of claims 5, 6 and 7, wherein the ventilation zone is arranged to be exposed when the aerosol-generating article is received within the device cavity. 9. An aerosol-generating system according to any preceding claim, wherein the aerosol-generating article has a ventilation level of at least about 10%. 10. An aerosol-generating system according to any preceding claim, wherein the aerosol-generating element has a length of about 10 mm to about 20 mm. 11. An aerosol-generating system according to any preceding claim, wherein the aerosol-generating element comprises a tobacco cut filler. 12. An aerosol-generating system according to any preceding claim, wherein the aerosol former content in the aerosol-generating element is at least about 10% by weight. 13. An aerosol-generating system according to any preceding claim, wherein the hollow tubular element has a length of at least about 25 mm and wherein the cross-section of the hollow tubular element is substantially constant. 14. An aerosol-generating system according to any preceding claim, wherein the hollow tubular element has a peripheral wall thickness of less than about 1.5 mm. 15. An aerosol-generating system according to any preceding claim, wherein the hollow tubular element defines an unobstructed airflow path extending from the downstream end of the aerosol-generating element to the downstream end of the downstream section.

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