KR20230011978A - Aerosol-generating article with anti-burn wrapper - Google Patents

Abstract

An aerosol-generating article (10; 110) is provided for generating an inhalable aerosol upon heating. The aerosol-generating article 10; 110 comprises a rod 12 of an aerosol-generating substrate extending from the rod proximal end to the rod distal end upstream of the rod proximal end; a downstream section 14 at a position downstream of the rod 12 of the aerosol-generating substrate; and a wrapper 70 surrounding at least the rod 12 of the aerosol-generating substrate, the wrapper comprising a wrapping base material having a basis weight. At least the treated portion 72 of the wrapper extending between the rod proximal end and the rod distal end includes a flame retardant composition comprising one or more flame retardant compounds. Thus, the treated portion 72 of the wrapper 70 has an overall basis weight greater than the basis weight of the wrapping base material. The treated portion 72 includes at least about 2 grams of one or more flame retardant compounds per square meter of surface area of the treated portion.

Description

Aerosol-generating article with anti-burn wrapper

The present invention relates to an aerosol-generating article comprising an aerosol-generating substrate and configured to generate an inhalable aerosol when heated.

Aerosol-generating articles are known in the art in which an aerosol-generating substrate, such as a tobacco-containing substrate, is heated rather than combusted.

In a conventional cigarette, the consumer applies a flame to the distal end of the cigarette while drawing air through the proximal end. Heat generated locally by the flame and oxygen in the air drawn through the cigarette causes ignition of the distal end of the cigarette, and combustion of the tobacco rod and surrounding wrapper produces inhalable smoke. In contrast, in a heated aerosol-generating article, the aerosol is further transferred from the heat source to a physically separate aerosol-generating substrate or material, which may be located in, in contact with, within the heat source, around the heat source or downstream of the heat source. Generated by gentle heat transfer. 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 into 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 also been proposed.

Aerosol-generating articles in which a tobacco-containing substrate is heated rather than combusted presents a number of challenges not encountered in conventional smoking articles. 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. However, the heating temperature cannot be too low as this can affect nicotine release from the tobacco-containing substrate and delivery of nicotine to the consumer. Also, to maximize heat transfer efficiency, it is generally preferred that the heat source is located as close as possible, preferably in contact with the aerosol-generating substrate.

Thus, in existing aerosol-generating articles designed to be heated by a heater blade inserted into the aerosol-generating substrate or by a susceptor arranged within the aerosol-generating substrate, the aerosol-generating substrate typically consists of combining a paper layer with a metal foil such as aluminum foil. surrounded by rappers. Thus, the metal layer interposed between the aerosol-generating substrate and the paper wrapper acts as a heat shield and prevents the paper wrapper from being scorched or carbonized during use.

This is desirable because it increases the safety of use of the aerosol-generating article and prevents paper combustion products or paper pyrolysis products from being transferred to the consumer during use. However, the inclusion of one such metal shield makes the manufacturing process more complex and costly and can increase the environmental impact of the aerosol-generating article when discarded after use. Additionally, as the original visual impact of an aerosol-generating article is substantially preserved during use, it can be difficult to determine whether an aerosol-generating article has been used effectively.

Accordingly, it would be desirable to provide a new and improved aerosol-generating article that is easy to dispose of and has a reduced environmental impact while being adapted to prevent scorching or carbonization of the article during use. Second, there is a generally felt need for new and improved aerosol-generating articles that substantially deter abuse of the articles, such that the articles are adapted to heat an aerosol-generating substrate and can be used correctly only in aerosol-generating devices not used as conventional cigarettes. . It would also be desirable to provide one such aerosol-generating article that can be manufactured efficiently and at high speed, preferably without requiring extensive modifications of existing equipment.

Accordingly, it would be desirable to provide new and improved aerosol-generating articles adapted to achieve at least one of the above-described desirable results.

The present disclosure relates to an aerosol-generating article for generating an inhalable aerosol upon heating, the aerosol-generating article comprising a rod of an aerosol-generating substrate extending from a rod proximal end to a rod distal end upstream of the rod proximal end. The aerosol-generating substrate may include at least an aerosol former. The aerosol-generating article may include a downstream section at a location downstream of the rod of the aerosol-generating substrate. The aerosol-generating article may include a wrapper surrounding at least a rod of the aerosol-generating substrate. The wrapper may include a wrapping base material having a basis weight. At least a treated portion of the wrapper extending between the rod proximal end and the rod distal end may comprise a flame retardant composition comprising one or more flame retardant compounds such that the treated portion of the wrapper has a total dry basis weight greater than the dry basis weight of the wrapping base material. can The treated part includes at least about 2 grams of one or more flame retardant compounds per square meter of surface area of the treated part.

According to the present invention there is provided an aerosol-generating article for generating an inhalable aerosol upon heating, the aerosol-generating article comprising: a rod of an aerosol-generating substrate extending from a rod proximal end to a rod distal end upstream of the rod proximal end; a downstream section at a location downstream of the rod of aerosol-generating substrate; and a wrapper at least surrounding the rod of the aerosol-generating substrate, the wrapper comprising a wrapping base material having a basis weight. At least a treated portion of the wrapper extending between the rod proximal end and the rod distal end comprises a flame retardant composition comprising one or more flame retardant compounds such that the treated portion of the wrapper has a total dry basis weight greater than the dry basis weight of the wrapping base material. . The treated part includes at least about 2 grams of one or more flame retardant compounds per square meter of surface area of the treated part.

The present disclosure also relates to a method of making an aerosol-generating article for generating an inhalable aerosol upon heating. The method may include providing a continuous rod of an aerosol-generating substrate. The method may include the additional step of enclosing a continuous rod of aerosol-generating substrate with a wrapper, wherein the wrapper comprises a wrapping base material having a dry basis weight. The method may also include treating at least a portion of the wrapper with a flame retardant composition comprising one or more flame retardant compounds such that the treated portion of the wrapper has a total dry basis weight greater than the dry basis weight of the wrapping base material. The method also includes cutting the treated wrapped continuous rod of the aerosol-generating substrate into individual rods, wherein the treated portion of the wrapper in each individual rod has at least about 2 grams of one or more flame retardant properties per square meter of surface area of the treated portion. Extending each individual rod from a respective rod proximal end to a respective rod distal end upstream of the respective rod proximal end to include the compound.

According to the present invention there is further provided a method of manufacturing an aerosol-generating article for generating an inhalable aerosol upon heating, the method comprising: providing a continuous rod of an aerosol-generating substrate; surrounding the continuous rod of the aerosol-generating substrate with a wrapper, the wrapper comprising a wrapping base material having a dry basis weight; treating at least a portion of the wrapper with a flame retardant composition comprising one or more flame retardant compounds, such that the treated portion of the wrapper has a total hay basis weight greater than the dry basis weight of the wrapping base material; and cutting the treated wrapped continuous rod of the aerosol-generating substrate into individual rods, wherein the treated portion of the wrapper in each individual rod comprises at least about 2 grams of one or more flame retardant compounds per square meter of surface area of the treated portion. , each individual rod extending from a respective rod proximal end to a respective rod distal end upstream of the respective rod proximal end;

The present disclosure also relates to an aerosol-generating system comprising an electrically operated aerosol-generating device and an aerosol-generating article as set forth above. The aerosol-generating device may include means for heating the rod of the aerosol-generating substrate to a temperature sufficient to generate an aerosol from the aerosol-generating substrate.

According to the present invention there is further provided an aerosol-generating system comprising an electrically operated aerosol-generating device and an aerosol-generating article as described above, wherein the aerosol-generating device moves a rod of an aerosol-generating substrate sufficient to generate an aerosol from the aerosol-generating substrate. It includes means for heating to temperature.

As briefly described above, the present invention provides an aerosol-generating article for generating an inhalable aerosol when heated, the article comprising: a rod of an aerosol-generating substrate extending from a rod proximal end to a rod distal end upstream of the rod proximal end; and a downstream section at a location downstream of the rod of the aerosol-generating substrate. More specifically, the present invention provides a method for generating an inhalable aerosol upon heating at a temperature of about 100°C to about 800°C, preferably about 150°C to about 500°C, more preferably about 200°C to about 300°C. An aerosol-generating article is provided.

These temperatures are significantly lower than those reached in conventional cigarettes upon combustion of a tobacco-containing substrate, and are much lower than those reached by commercially available cigarette lighters, which may range from about 1000°C to 2000°C and are much could be higher

The aerosol-generating article also includes a wrapper comprising at least a wrapping base material having a basis weight as a wrapper surrounding a rod of the aerosol-generating substrate. In contrast to conventional aerosol-generating articles, at least a treated portion of the wrapper extending between the rod proximal end and the rod distal end comprises a flame retardant composition comprising one or more flame retardant compounds. Thus, the treated portion of the wrapper has an overall basis weight greater than the basis weight of the wrapping base material. More specifically, the treated part comprises at least about 2 grams of one or more flame retardant compounds per square meter of surface area of the treated part.

Applicants have found that by surrounding the aerosol-generating substrate with a wrapper, the treated portion of the wrapper comprises the flame retardant composition and the treated portion extends over a majority of the outer surface area of the rod of the aerosol-generating substrate, and upon heating during use It has been found that it is advantageously possible to prevent the wrapper and underlying aerosol-generating substrate from being carbonized or scorched. That is, it is advantageously possible to substantially prevent combustion and thermal decomposition of the components of the aerosol-generating article according to the present invention.

In an aerosol-generating article according to the present invention, this is preferably achieved without the need for an additional layer of metal foil or other heat barrier material to be included in the aerosol-generating article. This can simplify the manufacturing process and thus reduce manufacturing costs. Disposal of the aerosol-generating articles according to the present invention is also facilitated, since there is no need to separate and recover valuable recyclable materials, such as aluminum foil, when the used aerosol-generating article is disposed of. Furthermore, the present inventors have found that enclosing an aerosol-generating substrate by a wrapper as described above significantly discolors the aerosol-generating substrate when the aerosol-generating substrate is exposed to temperatures ranging from about 100° C. to about 800° C. during use. It was found that the surface of the wrapper turned dark brown or dark brown. As such, it is immediately possible for the consumer to be informed if the aerosol-generating article has been previously used and should be discarded.

The amount of flame retardant compound in the wrapper within the foregoing range (e.g., in terms of amount per square meter of surface area of the treated portion), and the degree to which the surface of the wrapper is treated with the flame retardant composition (e.g., the extent to which the treated portion is extended). By adjusting the formulation of the flame retardant composition (i.e., the nature of the flame retardant compound or compounds), as well as in terms of the fraction of the surface area of the rod being loaded, it is advantageously possible to improve the overall flame retardant properties of wrappers and aerosol-generating articles.

Accordingly, the present invention provides improved aerosol-generating articles that can substantially prevent scorching and carbonization of aerosol-generating substrates and wrappers during use. This is because by providing one or more flame retardant compounds on or in the wrapper or both, it is possible to substantially prevent heat supplied to the article to generate aerosol-induced thermal decomposition or combustion of the wrapper base material.

Aerosol-generating articles according to the present invention advantageously are easy to dispose of and have a reduced environmental impact, as the article does not need to comprise a layer of metal foil, as is generally common to existing aerosol-generating articles.

Furthermore, the aerosol-generating article according to the present invention has the additional advantage that it can be used only exactly as intended, ie in combination with a device adapted to heat an aerosol-generating substrate. Indeed, unlike conventional cigarettes, aerosol-generating articles according to the present invention are inherently incapable of being ignited and cannot sustain burning like conventional cigarettes.

According to the present invention, an aerosol-generating article for generating an inhalable aerosol upon heating is provided.

The term “aerosol-generating article” is used herein to refer to an article in which an aerosol-generating substrate is heated to produce 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 light 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 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.

As used herein in connection with the present invention, the term 'rod' is used to denote a substantially circular element of substantially circular, oval 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.

An aerosol-generating article according to the present invention comprises a rod of an aerosol-generating substrate. The rod of the aerosol-generating substrate extends from the rod proximal end to the rod distal end upstream of the rod proximal end. The aerosol-generating article also includes a downstream section at a location downstream of the rod of the aerosol-generating substrate.

In an aerosol-generating article according to the invention, at least the rod of the aerosol-generating substrate is surrounded by a wrapper. This means that in the aerosol-generating article according to the present invention, the same wrapper surrounding the rod of the aerosol-generating substrate is also provided at a position upstream of the rod of the aerosol-generating substrate at least part of the downstream section of the aerosol-generating article or at least one of the optional further components. It means that it can enclose some or both.

The aerosol-generating article may have an overall 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.

In some embodiments, the overall length of an aerosol-generating article according to the present invention is preferably no more than 80 mm. More preferably, the overall length of an aerosol-generating article according to the present invention is no greater than 70 mm. Even more preferably, the overall length of the aerosol-generating article according to the present invention is preferably equal to or less than 60 mm. Most preferably, the overall length of an aerosol-generating article according to the present invention is preferably less than or equal to 50 mm.

In a preferred embodiment, the overall length of the aerosol-generating article is from about 38 mm to about 70 mm, more preferably from about 40 mm to about 70 mm, 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.

In another embodiment, the overall length of an aerosol-generating article according to the present invention is preferably at least about 40 mm, more preferably about 50 mm, even more preferably about 60 mm. In these embodiments, the overall length of the aerosol generation is preferably no greater than about 95 mm, more preferably no greater than about 90 mm, even more preferably no greater than 85 mm, and most preferably no greater than 80 mm.

In a preferred embodiment, the overall length of the aerosol-generating article is about 40 mm to about 95 mm, preferably about 40 mm to about 90 mm, more preferably about 40 mm to about 85 mm, even more preferably about 40 mm. mm to about 80 mm. In another embodiment, the overall length of the aerosol-generating article is from about 50 mm to about 95 mm, preferably from about 50 mm to about 90 mm, more preferably from about 50 mm to about 85 mm, even more preferably from about 50 mm mm to about 80 mm. In a further embodiment, the overall length of the aerosol-generating article is from about 60 mm to about 95 mm, preferably from about 60 mm to about 90 mm, more preferably from about 60 mm to about 85 mm, even more preferably from about 60 mm mm to about 80 mm. In a further embodiment, the overall length of the aerosol-generating article is from about 70 mm to about 95 mm, preferably from about 70 mm to about 90 mm, more preferably from about 70 mm to about 85 mm, and even more preferably from about 70 mm to about 90 mm. mm to about 80 mm. In an exemplary embodiment, the overall length of the aerosol-generating article is about 75 mm.

Aerosol-generating articles according to the invention may have an outer diameter of at least 4 mm. Preferably, the aerosol-generating article has an outer diameter of at least 5 mm. More preferably, the aerosol-generating article has an outer diameter of at least 6 mm. Even 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 is about 4 mm to about 12 mm, preferably about 5 mm to about 12 mm, more preferably about 6 mm to about 12 mm, even more preferably about 7 mm to about It has an outer diameter of 12 mm. In another embodiment, the aerosol-generating article is about 4 mm to about 10 mm, preferably about 5 mm to about 10 mm, more preferably about 6 mm to about 10 mm, even more preferably about 7 mm to about It has an outer diameter of 10 mm. In a further embodiment, the aerosol-generating article is about 4 mm to about 8 mm, preferably about 5 mm to about 8 mm, more preferably about 6 mm to about 8 mm, even more preferably about 7 mm to about It has an outer diameter of 8 mm.

The rod of the aerosol-generating substrate may have a length of about 5 mm to about 100 mm.

In some embodiments, the rod of the aerosol-generating substrate has a length of at least about 6 mm, more preferably at least about 7 mm. In these embodiments, the rod of the aerosol-generating substrate may have a length of less than about 90 mm, preferably less than about 70 mm, more preferably less than about 65 mm, more preferably less than about 50 mm, most preferably less than about 50 mm. has a length of less than 40 mm. In a particularly preferred embodiment, the rod of the aerosol-generating substrate has a length of less than about 35 mm, more preferably less than 25 mm, and even more preferably less than about 20 mm. In one embodiment, the rod of the aerosol-generating substrate may have a length of about 10 mm. In a preferred embodiment, the rod of the aerosol-generating substrate has a length of about 12 mm. This may be combined with an overall length of the aerosol-generating article of about 45 mm.

In another embodiment, the aerosol-generating rod preferably has a length of at least about 10 mm, more preferably at least about 20 mm, even more preferably at least about 30 mm. In these embodiments, the length of the rod of the aerosol-generating substrate is preferably about 60 mm or less, more preferably about 50 mm or less, and even more preferably about 40 mm or less.

In a preferred embodiment, the length of the rod of the aerosol-generating substrate is from about 10 mm to about 60 mm, preferably from about 20 mm to about 60 mm, more preferably from about 30 mm to about 60 mm. In another embodiment, the length of the rod of the aerosol-generating substrate is from about 10 mm to about 50 mm, preferably from about 20 mm to about 50 mm, more preferably from about 30 mm to about 50 mm. In a further embodiment, the length of the rod of the aerosol-generating substrate is from about 10 mm to about 40 mm, preferably from about 20 mm to about 40 mm, more preferably from about 40 mm to about 60 mm. In an exemplary embodiment, the length of the rod of the aerosol-generating substrate is about 35 mm. This may be combined with an overall length of the aerosol-generating article of about 75 mm.

Preferably, the rod of the aerosol-generating substrate has 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.

In aerosol-generating articles according to the present invention, the density of the aerosol-generating substrate preferably exceeds about 300 mg/cm3. As used herein, with reference to an aerosol-generating substrate of an aerosol-generating article according to the present invention, the term "density" refers to the "apparent density" or "bulk density" of the substrate, and refers to the body of the aerosol-generating substrate of a given volume. equal to the total mass of , which is the mass of the homogenized plant material, aerosol former, etc., or the mass of a given volume of gel composition divided by said volume of a rod of aerosol-generating substrate.

Thus, for example, the density of an aerosol-generating substrate determines the mass of a body of homogenised tobacco material of a given volume and the packing efficiency of a given surface area of homogenised tobacco material. The density of a homogenised tobacco material is generally determined to a large extent by the type of process used for its manufacture. A number of reconstitution processes are known in the art for producing homogenised tobacco material. These include, for example, papermaking processes of the type described in US Pat. No. 5,724,998; casting processes of the type described, for example, in US Pat. No. 5,724,998; a dough reconstitution process of the type described, for example, in US Pat. No. 3,894,544; and extrusion processes of the type described, for example, in GB-A-983,928.

Typically, the density of the homogenised tobacco material produced by the extrusion process and the dough reconstitution process is greater than the density of the homogenised tobacco material produced by the casting process. The density of the homogenised tobacco material produced by the extrusion process may be greater than the density of the homogenised tobacco material produced by the dough reconstitution process.

By way of example, the density of the aerosol-generating substrate is at least about 310 mg/cm3 or at least about 320 mg/cm3 or at least about 330 mg/cm3.

In some embodiments, the density of the aerosol-generating substrate is preferably at least about 350 mg/cm3. More preferably, the density of the aerosol-generating substrate is at least about 400 mg/cm3. Even more preferably, the density of the aerosol-generating substrate is at least about 450 mg/cm3. In particularly preferred embodiments, the density of the aerosol-generating substrate is at least about 500 mg/cm3. Preferably, the aerosol-generating substrate has a density of about 1000 mg/cm3 or less, more preferably about 900 mg/cm3 or less, and even more preferably about 800 mg/cm3 or less. As an example, the density of the aerosol-generating substrate is from about 350 mg/cm³ to about 1000 mg/cm³, preferably from about 400 mg/cm³ to about 1000 mg/cm³, more preferably from about 450 mg/cm³ to about 1000 mg/cm³. cm3, even more preferably from about 500 mg/cm3 to about 1000 mg/cm3. As another example, the aerosol-generating substrate has a density of about 350 mg/cm³ to about 900 mg/cm³, preferably about 400 mg/cm³ to about 900 mg/cm³, more preferably about 450 mg/cm³ to about 900 mg /cm3, even more preferably from about 500 mg/cm3 to about 900 mg/cm3. As a further example, the density of the aerosol-generating substrate is from about 350 mg/cm³ to about 800 mg/cm³, preferably from about 400 mg/cm³ to about 800 mg/cm³, more preferably from about 450 mg/cm³ to about 800 mg /cm3, even more preferably from about 500 mg/cm3 to about 800 mg/cm3.

In another embodiment, the aerosol-generating substrate has a density of at least about 600 mg/cm³, preferably at least about 700 mg/cm³, more preferably at least about 800 mg/cm³, even more preferably at least about 900 mg/cm³ to be. In some particularly preferred embodiments, the aerosol-generating substrate has a density of at least about 1 g/cm3, preferably at least about 1.1 g/cm3, more preferably at least about 1.2 g/cm3, and even more preferably at least about 1.3 g/cm3. cm³. Preferably, the density of the aerosol-generating substrate is less than or equal to about 2.0 g/cm3, more preferably less than or equal to about 1.9 g/cm3, and even more preferably less than or equal to 1.8 g/cm3. In a preferred embodiment, the aerosol-generating substrate has a density of less than or equal to about 1.7 g/cm3, more preferably less than or equal to about 1.6 g/cm3, and even more preferably less than or equal to about 1.5 g/cm3.

As an example, the density of the aerosol-generating substrate is from about 1 g/cm³ to about 1.7 g/cm³, preferably from about 1.1 g/cm³ to about 1.7 g/cm³, more preferably from about 1.2 g/cm³ to about 1.7 g/cm³. , and even more preferably from about 1.3 g/cm3 to about 1.7 g/cm3. As another example, the aerosol-generating substrate has a density of from about 1 g/cm³ to about 1.6 g/cm³, preferably from about 1.1 g/cm³ to about 1.6 g/cm³, more preferably from about 1.2 g/cm³ to about 1.6 g/cm³. cm3, even more preferably from about 1.3 g/cm3 to about 1.6 g/cm3. As a further example, the aerosol-generating substrate has a density of from about 1 g/cm³ to about 1.5 g/cm³, preferably from about 1.1 g/cm³ to about 1.5 g/cm³, more preferably from about 1.2 g/cm³ to about 1.5 g/cm³. cm3, even more preferably from about 1.3 g/cm3 to about 1.5 g/cm3.

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 homogenized tobacco material for an aerosol-generating substrate of the present invention comprises particles of a tobacco material obtained by micronizing, milling or grinding plant material and optionally one or more of tobacco leaf blades and tobacco leaf stems. It can be formed by aggregation. 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. For example, 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 laminar 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, strands may form in situ within the aerosol-generating substrate, for example as a result of crimping, as a result of splitting or cracking of the sheet of homogenized plant material during formation of the aerosol-generating substrate. there is. 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.

Preferably, the aerosol-generating substrate is in the form of one or more sheets of homogenized plant material. In various embodiments of the present invention, one or more sheets of homogenized plant material may be produced by a casting process. In various embodiments of the present invention, one or more sheets of homogenized plant material may be produced by a papermaking process. 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 g/m ² to about 300 g/m ² .

Each of the one or more sheets as described herein individually contains about 0.3 g/cm ³ to about 1.3 g/cm ³ , preferably about 0.7 g/cm ³ to about 1.0 g/cm ³ .

In embodiments of the invention wherein 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 “gathered” refers to a sheet of homogenized plant material being rolled, folded, or otherwise compressed or shrunk substantially transverse 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 additionally to being crimped, one or more sheets of homogenized plant material may be embossed, debossed, 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 crimping 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 length of the strand can be determined by the manufacturing process, whereby the rod is cut into shorter plugs and the length of the strand corresponds to the length of the plug. Strands can be brittle, which can lead to breakage, particularly during shipping. In this case, the length of some strands may be less than the length of the plug.

The plurality of strands extend substantially longitudinally along the length of the aerosol-generating substrate, preferably aligned with the longitudinal axis. Preferably, the plurality of strands are aligned substantially parallel 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 the present invention, the term “tobacco particle” describes particles 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 material.

Tobacco particles can be made from one or more tobacco plant varieties. Any type of tobacco may be used in the blend. Examples of tobacco types that may be used are sun-cured tobacco, flue-cured tobacco, Burley tobacco, Maryland tobacco, orient tobacco, Virginia tobacco, and other specialty tobacco.

Blowing is a method of drying tobacco, especially used for Virginia tobacco. During the burning process, heated air is circulated through the densely packed tobacco. During the first stage, tobacco leaves turn yellow and wither. During the second stage, the leaf blades dry completely. During the third stage, the petiole is completely dry.

Burley tobacco plays an important role in many tobacco blends. Burley tobacco has a unique flavor and aroma, and also has the ability to absorb large amounts of case.

Oriental is a type of tobacco with small leaves and high aromatic qualities. However, Orient tobacco has a milder flavor than, for example, Burley. Generally, oriental tobacco is used in relatively small proportions in tobacco blends.

Kasturi, Madura and Jatim are the subtypes of rolled tobacco available. Preferably, casturi tobacco and flue-cured tobacco may be used in a blend to produce tobacco particles. Thus, the tobacco particles in the particulate plant material may include a blend of casturi tobacco and xanthophyll tobacco.

The tobacco particles may have a nicotine content of at least about 2.5% by weight on a dry weight basis. More preferably, the tobacco particles have a nicotine content of at least about 3%, even more preferably at least about 3.2%, even more preferably at least about 3.5%, and most preferably at least about 4% on a dry weight basis. can have

In certain other embodiments of the present invention, the homogenized plant material comprises tobacco particles in combination with non-tobacco plant flavor particles. Preferably, the non-tobacco plant flavor particles are selected from one or more of ginger particles, eucalyptus particles, clove particles and star anise particles. Preferably, in this embodiment, the homogenized plant material comprises at least about 2.5% by weight on a dry weight basis of non-tobacco plant flavor particles, with the remaining plant particles being tobacco particles. Preferably, the homogenized plant material comprises at least about 4% by weight of non-tobacco plant flavor particles on a dry weight basis, more preferably at least about 6% by weight of non-tobacco plant flavor particles, more preferably at least about 8% by weight of non-tobacco plant flavor particles. % by weight of non-tobacco plant flavor particles, more preferably at least about 10% by weight of non-tobacco plant flavor particles. Preferably, the homogenized plant material comprises at most about 20% by weight of non-tobacco plant flavor particles, more preferably at most about 18% by weight of non-tobacco plant flavor particles, and more preferably at most about 16% by weight of non-tobacco plant flavor particles. Tobacco plant flavor particles.

The weight ratio of non-tobacco plant flavor particles and tobacco particles in the particulate plant material forming the homogenized plant material can be varied depending on the desired flavor characteristics and the composition of the aerosol generated from the aerosol-generating substrate during use. Preferably, the homogenized plant material is at least a 1:30 weight ratio of non-tobacco plant flavor particles to tobacco particles, more preferably at least a 1:20 weight ratio of non-tobacco plant flavor particles to tobacco particles, more preferably at least a 1:10 weight ratio of non-tobacco plant flavor particles to tobacco particles, most preferably at least a 1:5 weight ratio on a dry weight basis to tobacco particles.

Alternatively or in addition to including tobacco particles in the homogenized plant material of the aerosol-generating substrate according to the present invention, the homogenized plant material may include cannabis particles. The term “cannabis particle” refers to particles of cannabis plants such as Cannabis sativa, Cannabis indica , and Cannabis ruderalis species.

The homogenized plant material preferably comprises, on a dry weight basis, no more than about 95% particulate plant material. Thus, the particulate plant material is typically combined with one or more other ingredients to form a homogenized plant material.

The homogenized plant material may further include a binder to alter the mechanical properties of the particulate plant material, and the binder is included in the homogenized plant material during manufacture as described herein. Suitable extrinsic binders are known to those skilled in the art and include, but are not limited to, gums such as guar gum, xanthan gum, gum arabic, and locust bean gum; cellulosic binders such as hydroxypropyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose and ethyl cellulose; polysaccharides such as starch, organic acids such as alginic acid, conjugate base salts of organic acids such as sodium alginate, agar and pectin; and combinations thereof. Preferably, the binder includes guar gum.

The binder may be present in an amount of from about 1% to about 10% by weight, based on the dry weight of the homogenized plant material, preferably from about 2% to about 5% by weight, based on the dry weight of the homogenized plant material.

Alternatively or additionally, the homogenized plant material may further comprise one or more lipids to facilitate the diffusivity of volatile components (e.g., aerosol formers, gingerols and nicotine), the lipids described herein included in the homogenized plant material during manufacture, such as bar. Suitable lipids for inclusion in the homogenized plant material include, but are not limited to, medium chain triglycerides, cocoa butter, palm oil, palm kernel oil, mango oil, shea butter, soybean oil, cottonseed oil, palm oil, hydrogenated palm oil, candelilla wax, carr Nauba wax, shellac, sunflower wax, sunflower oil, rice bran, and Revel A; and combinations thereof.

Alternatively or additionally, the homogenized plant material may further comprise a pH modifier.

Alternatively or additionally, the homogenized plant material may further include fibers for modifying the mechanical properties of the homogenized plant material, and the fibers are included in the homogenized plant material during manufacture as described herein. Extrinsic fibers suitable for inclusion in the homogenized plant material are known in the art and include cellulosic fibers; softwood fibers; hardwood fibers; jute fibers; and fibers formed from non-tobacco materials and non-ginger materials, including but not limited to combinations thereof. In addition, extrinsic fibers derived from tobacco and/or ginger may be added. Any fibers added to the homogenized plant material are not considered to form part of the "particulate plant material" as discussed above. Prior to incorporation into the homogenized plant material, the fibers are subjected to mechanical pulping; refining; chemical pulping; bleaching; sulfate pulping; and combinations thereof, but may be processed by suitable processes known in the art. A fiber usually has a length greater than its width.

Suitable fibers usually have a length greater than 400 μm and up to 4 mm, preferably within the range of 0.7 mm to 4 mm. Preferably, the fibers are present in an amount of about 2% to about 15%, most preferably about 4% by weight, based on the dry weight of the substrate.

Alternatively or additionally, the homogenized plant material 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 homogenized plant material forms an aerosol of 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. 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 homogenized plant material 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 do. 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.

In certain preferred embodiments of the present invention, 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 includes 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.

The gel contains cannabidiol (CBD), tetrahydrocannabinol (THC), tetrahydrocannabinolic acid (THCA), cannabidiolic acid (CBDA), cannabinol (CBN), cannabigerol (CBG), cannabis Chromene (CBC), Cannabicyclol (CBL), Cannabivarin (CBV), Tetrahydrocannabivarin (THCV), Cannabidivarin (CBDV), Cannabichromvarin (CBCV), Cannabigerobarin (CBGV), cannabigerol monomethyl ether (CBGM), cannabielsoin (CBE), cannabicitran (CBT), and combinations thereof.

The gel composition may include a cannabinoid compound, preferably selected from the group consisting of cannabidiol (CBD), THC (tetrahydrocannabinol), and combinations thereof.

The gel may preferably contain cannabidiol (CBD).

The gel composition may include nicotine and cannabidiol (CBD).

The gel composition may include nicotine, and may include cannabidiol (CBD), and THC (tetrahydrocannabinol).

The gel composition preferably contains from about 0.5% to about 10% by weight of an alkaloid compound, or from about 0.5% to about 10% by weight of a cannabinoid compound, or from about 0.5% to about 10% by weight of an alkaloid compound in a total amount. and cannabinoid compounds. The gel composition contains from about 0.5% to about 5% by weight of an alkaloid compound, or from about 0.5% to about 5% by weight of a cannabinoid compound, or from about 0.5% to about 5% by weight of an alkaloid compound and cannabis in a total amount. It may contain both noid compounds. Preferably, from about 1% to about 3% by weight of an alkaloid compound, or from about 1% to about 3% by weight of a cannabinoid compound, or from about 1% to about 3% by weight of an alkaloid compound in a total amount of the gel composition. and cannabinoid compounds. The gel composition preferably contains from about 1.5% to about 2.5% by weight of an alkaloid compound, or from about 1.5% to about 2.5% by weight of a cannabinoid compound, or from about 1.5% to about 2.5% by weight of an alkaloid compound in a total amount. and cannabinoid compounds. The gel composition may preferably comprise about 2% by weight of an alkaloid compound, or about 2% by weight of a cannabinoid compound, or both an alkaloid compound and a cannabinoid compound in a total amount of about 2% by weight. The alkaloid compound component of the gel formulation may be the most volatile component of the gel formulation. In some embodiments, water may be the most volatile component of the gel formulation and the alkaloid compound component of the gel formulation may be the second most volatile component of the gel formulation. The cannabinoid compound component of the gel formulation may be the most volatile component of the gel formulation. In some embodiments water may be the most volatile component of the gel formulation and the alkaloid compound component of the gel formulation may be the second most volatile component of the gel formulation.

Preferably, nicotine is included in the gel composition. Nicotine can be added to the composition in free base form or in salt form. The gel composition comprises from about 0.5% to about 10% nicotine by weight, or from about 0.5% to about 5% nicotine by weight. Preferably, the gel composition comprises about 1% to about 3% nicotine by weight, or about 1.5% to about 2.5% nicotine by weight, or about 2% nicotine by weight. The nicotine component of the gel formulation may be the most volatile component of the gel formulation. In some aspects water can be the most volatile component of the gel formulation and the nicotine component of the gel formulation can be the second most volatile component of the gel formulation.

The gel composition includes an aerosol former. Ideally, the aerosol former is substantially resistant to thermal degradation at the operating temperature of the associated aerosol-generating device. Suitable aerosol formers include polyhydric alcohols such as triethylene glycol, 1,3-butanediol and glycerin; 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 polyhydric alcohol or mixture thereof may be one or more of triethylene glycol, 1,3-butanediol and glycerin (glycerol or propane-1,2,3-triol) or polyethylene glycol. Preferably, the aerosol former is glycerol.

The gel composition may include a majority of the aerosol former. The gel composition may include a mixture of water and an aerosol former, wherein the aerosol former forms the majority (by weight) of the gel composition. The aerosol former may form at least about 50% by weight of the gel composition. The aerosol former may form at least about 60%, or at least about 65%, or at least about 70% by weight of the gel composition. The aerosol former may form about 70% to about 80% by weight of the gel composition. The aerosol former may form from about 70% to about 75% by weight of the gel composition.

The gel composition may include a majority of glycerol. The gel composition may include a mixture of water and glycerol, with glycerol forming the majority (by weight) of the gel composition. Glycerol may form at least about 50% by weight of the gel composition. Glycerol may form at least about 60% by weight or at least about 65% by weight or at least about 70% by weight of the gel composition. Glycerol may form about 70% to about 80% by weight of the gel composition. Glycerol may form about 70% to about 75% by weight of the gel composition.

The gel composition preferably includes at least one gelling agent. Preferably, the gel composition includes a total amount of gelling agent in the range of about 0.4% to about 10% by weight. More preferably, the composition includes a gelling agent in the range of about 0.5% to about 8% by weight. More preferably, the composition includes a gelling agent in the range of about 1% to about 6% by weight. More preferably, the composition includes a gelling agent in the range of about 2% to about 4% by weight. More preferably, the composition includes a gelling agent in the range of about 2% to about 3% by weight.

The term “gelling agent” refers to a compound that, when added to a 50% water/50% glycerol mixture by weight, in an amount of about 0.3% by weight, uniformly forms a solid medium or support matrix that induces a gel. Gelling agents include, but are not limited to, hydrogen-bond crosslinking gelling agents, and ionic crosslinking gelling agents.

The gelling agent may include one or more biopolymers. Biopolymers can be formed from polysaccharides.

Biopolymers include, for example, gellan gum (natural, low acyl gellan gum, high acyl gellan gum with low acyl gellan gum), xanthan gum, alginate (alginic acid), agar, guar gum, and the like. The composition may preferably include xanthan gum. The composition may include two biopolymers. The composition may include three biopolymers. A composition may include two biopolymers by weight of substantially equal weight. The composition may include three biopolymers in substantially equal weight.

Preferably, the gel composition includes at least about 0.2% by weight of a hydrogen-bond crosslinking gelling agent. Alternatively or additionally, the gel composition preferably includes at least about 0.2% by weight of an ionic crosslinking gelling agent. Most preferably, the gel composition comprises at least about 0.2% by weight of a hydrogen-bonded crosslinking gellant and at least about 0.2% by weight of an ionic crosslinking gellant. The gel composition comprises about 0.5% to about 3% by weight of a hydrogen-bonded crosslinking gellant and about 0.5% to about 3% by weight of an ionic crosslinking gellant, or about 1% to about 2% by weight of hydrogen-bonded gelling agents. crosslinking gelling agent and from about 1% to about 2% by weight of an ionic crosslinking gelling agent. The hydrogen-bonded crosslinking gellant and the ionic crosslinking gellant may be present in substantially equal weights of the gel composition.

The term “hydrogen-bond crosslinkinggelling agent” refers to a gelling agent that forms non-covalent crosslinking or physical crosslinking through hydrogen bonding. A hydrogen bond is a type of electrostatic dipole attraction between molecules that is not a covalent bond to hydrogen atoms. This results from the attraction between a highly electronegative atom, such as a N, O, or F atom, and a hydrogen atom covalently bonded to another highly electronegative atom.

The hydrogen-bond cross-linking gelling agent may include one or more of galactomannan, gelatin, agarose, or konjac gum or agar. The hydrogen-bonding crosslinking gelling agent may preferably include agar.

The gel composition includes a hydrogen-bond crosslinking gelling agent in the range of about 0.3% to about 5% by weight. Preferably, the composition includes a hydrogen-bond crosslinking gelling agent in the range of about 0.5% to about 3% by weight. Preferably, the composition includes a hydrogen-bond cross-linking gelling agent in the range of about 1% to about 2% by weight.

The gel composition may include galactomannan in the range of about 0.2% to about 5% by weight. Preferably, the galactomannan may range from about 0.5% to about 3% by weight. Preferably, the galactomannan may range from about 0.5% to about 2% by weight. Preferably, the galactomannan may range from about 1% to about 2% by weight.

The gel composition may include gelatin in the range of about 0.2% to about 5% by weight. Preferably, the gelatine may range from about 0.5% to about 3% by weight. Preferably, the gelatine may range from about 0.5% to about 2% by weight. Preferably, the gelatine may range from about 1% to about 2% by weight.

The gel composition may include agarose in the range of about 0.2% to about 5% by weight. Preferably, agarose may range from about 0.5% to about 3% by weight. Preferably, agarose may range from about 0.5% to about 2% by weight. Preferably, agarose may range from about 1% to about 2% by weight.

The gel composition may include konjac gum in the range of about 0.2% to about 5% by weight. Preferably, the konjac gum may range from about 0.5% to about 3% by weight. Preferably, the konjac gum may range from about 0.5% to about 2% by weight. Preferably, the konjac gum may range from about 1% to about 2% by weight.

The gel composition may include agar in the range of about 0.2% to about 5% by weight. Preferably, agar may range from about 0.5% to about 3% by weight. Preferably, agar may range from about 0.5% to about 2% by weight. Preferably, agar may range from about 1% to about 2% by weight.

The term “ionic crosslinkinggelling agent” refers to a gelling agent that forms non-covalent crosslinks or physical crosslinks through ionic bonds. Ionic crosslinking involves the linking of polymer chains by non-covalent interactions. A cross-linked network is formed when multivalent molecules of opposite charge are electrostatically attracted to each other, creating a cross-linked polymer network.

Ionic crosslinking gelling agents may include low acyl gellans, pectin, kappa carrageenan, iota carrageenan or alginates. The ionic cross-linking gelling agent may preferably include low acyl gellans.

The gel composition may include an ionic crosslinking gelling agent in the range of about 0.3% to about 5% by weight. Preferably, the composition includes an ionic crosslinking gelling agent in the range of about 0.5% to about 3% by weight. Preferably, the composition includes an ionic crosslinking gelling agent in the range of about 1% to about 2% by weight.

The gel composition may include low acyl gellans in the range of about 0.2% to about 5% by weight. Preferably, the low acyl gellans may range from about 0.5% to about 3% by weight. Preferably, the low acyl gellans may range from about 0.5% to about 2% by weight. Preferably, the low acyl gellans may range from about 1% to about 2% by weight.

The gel composition may include pectin in the range of about 0.2% to about 5% by weight. Preferably, pectin may range from about 0.5% to about 3% by weight. Preferably, pectin may range from about 0.5% to about 2% by weight. Preferably, pectin may range from about 1% to about 2% by weight.

The gel composition may include kappa carrageenan in the range of about 0.2% to about 5% by weight. Preferably, kappa carrageenan may range from about 0.5% to about 3% by weight. Preferably, kappa carrageenan may range from about 0.5% to about 2% by weight. Preferably, kappa carrageenan may range from about 1% to about 2% by weight.

The gel composition may include iota carrageenan in the range of about 0.2% to about 5% by weight. Preferably, iota carrageenan may range from about 0.5% to about 3% by weight. Preferably, iota carrageenan may range from about 0.5% to about 2% by weight. Preferably, iota carrageenan may range from about 1% to about 2% by weight.

The gel composition may include an alginate in the range of about 0.2% to about 5% by weight. Preferably, the alginate may range from about 0.5% to about 3% by weight. Preferably, the alginate may range from about 0.5% to about 2% by weight. Preferably, the alginate may range from about 1% to about 2% by weight.

The gel composition may include a hydrogen-bonded cross-linking gelling agent and an ionic cross-linking gelling agent in a ratio of about 3:1 to about 1:3. Preferably, the gel composition may include a hydrogen-bonded cross-linking gelling agent and an ionic cross-linking gelling agent in a ratio of about 2:1 to about 1:2. Preferably, the gel composition may include a hydrogen-bonded cross-linking gelling agent and an ionic cross-linking gelling agent in a ratio of about 1:1.

The gel composition may further include a viscosifying agent. A viscosifying agent in combination with a hydrogen-bonded cross-linking gelling agent and an ionic cross-linking gelling agent surprisingly appears to support the solid medium and maintain the gel composition even when the gel composition contains high levels of glycerol.

The term “viscosifying agent” refers to a compound that increases the viscosity without causing the formation of a gel, in an amount of 0.3% by weight when added uniformly to a mixture of 50% by weight water/50% by weight glycerol at 25° C. In other words, the mixture continues or leaves a fluid. Preferably, the viscosifying agent, when added uniformly to a 50 wt% water/50 wt% glycerol mixture at 25° C., in an amount of 0.3 wt% at a shear rate of 0.1 s ⁻¹ , does not cause the formation of a gel. It refers to a compound that increases the viscosity by at least 50 cPs, preferably at least 200 cPs, preferably at least 500 cPs, preferably at least 1000 cPs, and the mixture remains or leaves fluid. Preferably, the viscosifying agent, when added uniformly to a 50 wt% water/50 wt% glycerol mixture at 25° C., in an amount of 0.3 wt% at a shear rate of 0.1 s ⁻¹ , does not cause the formation of a gel. A compound that increases the viscosity at least 2 times, or at least 5 times, or at least 10 times, or at least 100 times higher than before addition, and the mixture remains or leaves a fluid.

Viscosity values recited herein may be measured using a Brookfield RVT viscometer rotating a disk type RV#2 spindle at 25° C. at a speed of 6 rpm.

The gel composition may include a viscosifying agent in the range of about 0.2% to about 5% by weight. Preferably, the composition includes a viscosifying agent in the range of about 0.5% to about 3% by weight. Preferably, the composition includes a viscosifying agent in the range of about 0.5% to about 2% by weight. Preferably, the composition includes a viscosifying agent in the range of about 1% to about 2% by weight.

The viscosifying agent may include one or more of xanthan gum, carboxymethyl-cellulose, microcrystalline cellulose, methyl cellulose, gum arabic, guar gum, lambda carrageenan, or starch. The viscosifying agent may preferably include xanthan gum.

The gel composition may include xanthan gum in the range of about 0.2% to about 5% by weight. Preferably, xanthan gum may range from about 0.5% to about 3% by weight. Preferably, xanthan gum may range from about 0.5% to about 2% by weight. Preferably, xanthan gum may range from about 1% to about 2% by weight.

The gel composition may include carboxymethyl-cellulose in the range of about 0.2% to about 5% by weight. Preferably, carboxymethyl-cellulose may range from about 0.5% to about 3% by weight. Preferably, carboxymethyl-cellulose may range from about 0.5% to about 2% by weight. Preferably, carboxymethyl-cellulose may range from about 1% to about 2% by weight.

The gel composition may include microcrystalline cellulose in the range of about 0.2% to about 5% by weight. Preferably, microcrystalline cellulose may range from about 0.5% to about 3% by weight. Preferably, microcrystalline cellulose may range from about 0.5% to about 2% by weight. Preferably, microcrystalline cellulose may range from about 1% to about 2% by weight.

The gel composition may include methyl cellulose in the range of about 0.2% to about 5% by weight. Preferably, methyl cellulose may range from about 0.5% to about 3% by weight. Preferably, methyl cellulose may range from about 0.5% to about 2% by weight. Preferably, methyl cellulose may range from about 1% to about 2% by weight.

The gel composition may include gum Arabic in the range of about 0.2% to about 5% by weight. Preferably, gum arabic may range from about 0.5% to about 3% by weight. Preferably, gum arabic may range from about 0.5% to about 2% by weight. Preferably, gum arabic may range from about 1% to about 2% by weight.

The gel composition may include from about 0.2% to about 5% by weight of guar gum. Preferably, guar gum may range from about 0.5% to about 3% by weight. Preferably, guar gum may range from about 0.5% to about 2% by weight. Preferably, guar gum may range from about 1% to about 2% by weight.

The gel composition may include lambda carrageenan in the range of about 0.2% to about 5% by weight. Preferably, lambda carrageenan may range from about 0.5% to about 3% by weight. Preferably, lambda carrageenan may range from about 0.5% to about 2% by weight. Preferably, lambda carrageenan may range from about 1% to about 2% by weight.

The gel composition may include starch in the range of about 0.2% to about 5% by weight. Preferably, the starch may range from about 0.5% to about 3% by weight. Preferably, the starch may range from about 0.5% to about 2% by weight. Preferably, the starch may range from about 1% to about 2% by weight.

The gel composition may further include divalent cations. Preferably, the divalent cation comprises a calcium ion such as calcium lactate in solution. Divalent cations, such as calcium ions, can aid in the gel formulation of a composition comprising a gelling agent, such as, for example, an ionic crosslinking gelling agent. Ionic effects can aid gel formulations. The divalent cation may be present in the gel composition in the range of about 0.1 to about 1 weight percent, or about 0.5 weight percent.

The gel composition may further include an acid. Acids may include carboxylic acids. Carboxylic acids may contain ketone groups. Preferably the carboxylic acid may include a ketone group having less than about 10 carbon atoms, or less than about 6 carbon atoms, or less than about 4 carbon atoms, such as levulinic acid or lactic acid. Preferably, this carboxylic acid has 3 carbon atoms (eg lactic acid). Lactic acid surprisingly improves the stability of the gel composition over similar carboxylic acids. Carboxylic acids can aid in gel formulations. The carboxylic acid can reduce the alkaloid compound concentration, or the cannabinoid compound concentration, or both the alkaloid compound concentration and the cannabinoid compound concentration within the gel composition during storage. The carboxylic acid can reduce the change in nicotine concentration in the gel composition during storage.

The gel composition may include a carboxylic acid in the range of about 0.1% to about 5% by weight. Preferably, the carboxylic acid may range from about 0.5% to about 3% by weight. Preferably, the carboxylic acid may range from about 0.5% to about 2% by weight. Preferably, the carboxylic acid may range from about 1% to about 2% by weight.

The gel composition may include lactic acid in the range of about 0.1% to about 5% by weight. Preferably, lactic acid may range from about 0.5% to about 3% by weight. Preferably, lactic acid may range from about 0.5% to about 2% by weight. Preferably, lactic acid may range from about 1% to about 2% by weight.

The gel composition may include levulinic acid in the range of about 0.1% to about 5% by weight. Preferably, levulinic acid may range from about 0.5% to about 3% by weight. Preferably, levulinic acid may range from about 0.5% to about 2% by weight. Preferably, levulinic acid may range from about 1% to about 2% by weight.

Preferably, the gel composition contains some water. A gel composition is more stable if the composition contains some water. Preferably, the gel composition comprises at least about 1% by weight, or at least about 2% by weight, or at least about 5% by weight of water. Preferably, the gel composition comprises at least about 10% or at least about 15% water by weight.

Preferably, the gel composition comprises about 8% to about 32% by weight of water. Preferably, the gel composition comprises about 15% to about 25% by weight of water. Preferably, the gel composition comprises about 18% to about 22% by weight of water. Preferably, the gel composition contains about 20% by weight of water.

Preferably, the aerosol-generating substrate comprises about 150 mg to about 350 mg of the gel composition.

Preferably, the aerosol-generating substrate comprises a porous medium loaded with a gel composition. An advantage of a porous medium loaded with gel is that the gel composition is maintained within the porous medium, which may be helpful in preparing, storing or transporting the gel composition. This can help maintain the desired shape of the gel composition, particularly during manufacture, transport or use.

The porous medium can be any suitable porous material capable of holding or holding a gel composition. Ideally, a porous medium allows the gel composition to migrate within it. In certain embodiments, the porous media includes natural, synthetic, or semi-synthetic materials, or combinations thereof. In certain embodiments, the porous media may be sheet material, foam, or fibers, such as loose fibers; or combinations thereof. In certain embodiments, the porous media includes woven, nonwoven, or extruded materials, or combinations thereof. Preferably, the porous medium comprises cotton, paper, viscose, PLA, or cellulose acetate, or combinations thereof. Preferably, the porous medium comprises a sheet material such as cotton or cellulose acetate. In a particularly preferred embodiment, the porous medium comprises a sheet made of cotton fibers.

Porous media used in the present invention may be crimped or minced. In a preferred embodiment, the porous media is crimped. In an alternative embodiment, the porous media includes minced porous media. The crimping or mincing process may be before or after the gel composition is loaded.

Crimping the sheet material has the advantage of improving the structure to allow passage through the structure. The passage through the crimped sheet material loads the gel, retains the gel, and also assists the fluid to pass through the crimped sheet material. Thus, there are advantages to using crimped sheet material as a porous medium.

Mincing provides a high surface area to volume ratio for the medium, allowing the gel to be readily absorbed.

In certain embodiments, the seat material is a composite material. Preferably, the sheet material is porous. The sheet material may aid in the manufacture of a tubular element comprising a gel. The sheet material may assist in incorporating the active agent into the tubular element comprising the gel. The sheet material may help stabilize the structure of the tubular element comprising the gel. The sheet material may aid in transport or storage of the gel. The use of a sheet material enables or aids in the addition of structure to the porous medium, for example by crimping the sheet material.

Porous media can be threads. Threads may include, for example, cotton, paper or acetate tow. The thread may also be loaded with a gel, such as any other porous medium. An advantage of using thread as a porous medium is that it can aid in ease of fabrication.

The thread may be loaded with gel by any known means. The threads may simply be coated with the gel, or the threads may be impregnated with the gel. In manufacture, the thread may be impregnated with the gel and stored ready for use to be included in an assembly of tubular elements.

The porous medium loaded with the gel composition is preferably provided within a tubular element forming part of the aerosol-generating article. The term "tubular element" is used to describe a component suitable for use in an aerosol-generating article. Ideally, the tubular element may be greater in longitudinal length than in width, but this need not be the case as it may be part of a multi-component article in which the longitudinal length of the tubular element is ideally greater than the width of the tubular element. Typically, the tubular element is cylindrical, but this is not necessarily the case. For example, tubular elements may have polygonal or arbitrary cross-sections such as ovoid, triangular or rectangular.

The tubular element preferably includes a first longitudinal passage. The tubular element is preferably formed of a wrapper defining the first longitudinal passage. The wrapper is preferably a water-resistant wrapper. This water-resistant property of the wrapper can be achieved by using a water-resistant material or by treating the material of the wrapper. This can be achieved by treating one or both sides of the wrapper. Having water resistance will help not to lose structure, stiffness or rigidity. It can also help prevent leakage of the gel or liquid, especially when a fluid structured gel is used.

In some embodiments, the rod of the aerosol-generating substrate further comprises a susceptor element arranged within the aerosol-generating substrate. Indeed, in some embodiments of an aerosol-generating article according to the present invention, a susceptor element, such as for example an elongated susceptor, is arranged substantially within a rod of an aerosol-generating substrate such that the susceptor element is in thermal contact with the aerosol-generating substrate.

As used herein in connection with the present invention, the term "susceptor" refers to a material capable of converting electromagnetic energy into heat. When placed in a fluctuating electromagnetic field, eddy currents induced in the susceptor heat the susceptor. As the elongated susceptor is placed in thermal contact with the aerosol-generating substrate, the aerosol-generating substrate is heated by the susceptor.

Preferably, the susceptor element is in the form of an elongated susceptor. When used to describe a susceptor, the term "elongate" refers to the susceptor having a length dimension greater than its width dimension or its thickness dimension, for example greater than twice its width dimension or its thickness dimension. it means.

The elongated susceptor is preferably arranged substantially longitudinally within the rod. This means that the length dimension of the elongated susceptor is arranged to be approximately parallel to the longitudinal direction of the rod, for example within +/- 10 degrees parallel to the longitudinal direction of the rod. In a preferred embodiment, the elongated susceptor can be located at a radially central position within the rod and can extend along the longitudinal axis of the rod.

Preferably, the elongated susceptor extends completely to the downstream end of the rod of the aerosol-generating article. In some embodiments, the susceptor can extend all the way to the upstream end of the rod of the aerosol-generating article. In a particularly preferred embodiment, the susceptor has substantially the same length as the rod of the aerosol-generating substrate and extends from the upstream end of the rod to the downstream end of the rod.

The susceptor is preferably in the form of a pin, rod, strip or blade.

The susceptor preferably has a length of about 5 mm to about 15 mm, such as about 6 mm to about 12 mm, or about 8 mm to about 10 mm.

The ratio between the length of the susceptor and the overall length of the aerosol-generating article may be from about 0.2 to about 0.35.

In some embodiments, the ratio between the length of the susceptor and the overall length of the aerosol-generating article is at least about 0.22, more preferably at least about 0.24, and even more preferably at least about 0.26. The ratio between the length of the susceptor and the overall length of the aerosol-generating article is preferably less than about 0.34, more preferably less than about 0.32, and even more preferably less than about 0.3. In another embodiment, the ratio between the length of the susceptor and the overall length of the aerosol-generating article is preferably from about 0.22 to about 0.34, more preferably from about 0.24 to about 0.34, even more preferably from about 0.26 to about 0.34. . In a further embodiment, the ratio between the length of the susceptor and the overall length of the aerosol-generating article is preferably from about 0.22 to about 0.32, more preferably from about 0.24 to about 0.32, even more preferably from about 0.26 to about 0.32. . In a further embodiment, the ratio between the length of the susceptor and the overall length of the aerosol-generating article is preferably from about 0.22 to about 0.3, more preferably from about 0.24 to about 0.3, even more preferably from about 0.26 to about 0.3. .

In a particularly preferred embodiment, the ratio between the length of the susceptor and the overall length of the aerosol-generating article is about 0.27.

The susceptor preferably has a width of about 1 mm to about 5 mm.

The susceptor may generally have a thickness of about 0.01 mm to about 2 mm, for example about 0.5 mm to about 2 mm. In some embodiments, the susceptor preferably has a thickness of about 10 μm to about 500 μm, more preferably about 10 μm to about 100 μm.

If the susceptor has a constant cross section, for example a circular cross section, it has a preferred width or diameter of about 1 mm to about 5 mm.

If the susceptor has the shape of a strip or blade, the strip or blade preferably has a rectangular shape with a width of about 2 mm to about 8 mm, more preferably about 3 mm to about 5 mm. As an example, the susceptor in the form of a strip of blade may have a width of about 4 mm.

If the susceptor has the shape of a strip or blade, the strip or blade preferably has a rectangular shape and a thickness of about 0.03 mm to about 0.15 mm, more preferably about 0.05 mm to about 0.09 mm. As an example, the susceptor in the form of a strip of blade may have a thickness of about 0.07 mm.

In a preferred embodiment, the elongated susceptor is in the form of a strip or blade, preferably has a rectangular shape, and has a thickness of about 55 μm to about 65 μm.

More preferably, the elongated susceptor has a thickness of about 57 μm to about 63 μm. Even more preferably, the elongated susceptor has a thickness of about 58 μm to about 62 μm. In a particularly preferred embodiment, the elongated susceptor has a thickness of about 60 μm.

Without being bound by theory, the inventors believe that the choice of a given thickness for the susceptor as a whole is also driven by constraints set by the selected length and width of the susceptor, as well as constraints set by the geometry and dimensions of the rod of the aerosol-generating substrate. Consider what is affected. As an example, the length of the susceptor is preferably selected to match the length of the rod of the aerosol-generating substrate, for example. The width of the susceptor should preferably be selected such that displacement of the susceptor within the substrate is prevented while also allowing easy insertion during manufacture.

In an aerosol-generating article wherein a susceptor having a thickness within the foregoing range is provided for supplying heat inductively during use, the inventors advantageously generate and distribute heat throughout the aerosol-generating substrate in a particularly effective and efficient manner. Found what can be done. Without being bound by theory, the inventors believe that this is because one such susceptor is adapted to provide optimal heat generation and heat transfer by means of the susceptor surface area and inductive force. In contrast, thinner susceptors may be too easy to deform and may not retain the desired shape and orientation within the rod of the aerosol-generating substrate during manufacture of the aerosol-generating article, which may be less uniform and less fine during use. can result in a calibrated heat distribution. At the same time, thicker susceptors can be more difficult to cut to length with precision and consistency, which also affects how accurately the susceptor can be provided in longitudinal alignment within the rod of the aerosol-generating substrate, and thus the rod. can potentially affect the homogeneity of heat distribution within This beneficial effect is particularly felt when the susceptor is fully extended to the downstream end of the rod of the aerosol-generating article. Therefore, it is believed that this is because there is no aerosol-generating substrate in the rod at a position downstream of the susceptor that can contribute to the RTD, so that the resistance to draw (RTD) downstream of the susceptor can be basically minimized. This is achieved particularly effectively in embodiments where the aerosol-generating article comprises a downstream section comprising a hollow middle section. One such hollow middle section does not directly contact the downstream end of the susceptor without contributing substantially to the overall RTD of the aerosol-generating article.

Without being bound by theory, the inventors contemplate that the most downstream portion of the rod of the aerosol-generating substrate may act to some extent as a filter for the more upstream portion of the rod of the aerosol-generating substrate. Accordingly, it is also desirable for the inventors to be able to uniformly heat the most downstream portion of the rod of the aerosol-generating substrate, which actively participates in the release of volatile aerosol species and contributes to the overall aerosol generation and delivery, and to reduce the amount of aerosol to the consumer. It is believed that any possible filtering effect that may hinder delivery is counteracted positively by the release of volatile aerosol species throughout the aerosol-generating substrate.

Preferably, the elongated susceptor has a length equal to or less than the length of the aerosol-generating substrate. Preferably, the elongated susceptor has the same length as the aerosol-generating substrate.

The susceptor may be formed of any material that can be inductively heated to a temperature sufficient to generate an aerosol from an aerosol-generating substrate. Preferred susceptors include metal or carbon.

A preferred susceptor may comprise or consist of a ferromagnetic material, for example a ferromagnetic alloy, ferritic iron or ferromagnetic steel or stainless steel. A suitable susceptor may be or include aluminum. Preferred susceptors may be formed from 400 series stainless steel, for example grade 410, or grade 420 or grade 430 stainless steel. Different materials dissipate different amounts of energy when placed in an electromagnetic field with similar values of frequency and field strength.

Accordingly, parameters of the susceptor such as material type, length, width and thickness can all be varied to provide the desired power dissipation in known electromagnetic fields. Preferred susceptors can be heated to temperatures in excess of 250°C.

A suitable susceptor may include a non-metallic core having a metal layer disposed on the non-metallic core, for example a metal track formed on the surface of a ceramic core. The susceptor may have a protective outer layer, for example a protective ceramic layer or a protective outer layer encapsulating the susceptor. The susceptor may include a protective coating formed of glass, ceramic, or an inert metal formed over a core of susceptor material.

The susceptor is arranged in thermal contact with the aerosol-generating substrate. Thus, when the susceptor is heated, the aerosol-generating substrate is heated to form an aerosol. Preferably, the susceptor is arranged in direct physical contact with the aerosol-generating substrate, for example within the aerosol-generating substrate.

The susceptor may be a multi-material susceptor and may include a first susceptor material and a second susceptor material. The first susceptor material is placed in close physical contact with the second susceptor material. The second susceptor material preferably has a Curie temperature lower than 500°C. When the susceptor is placed in a fluctuating electromagnetic field, the first susceptor material is preferably used primarily to heat the susceptor. Any suitable material may be used. For example, the first susceptor material may be aluminum or may be a material containing a ferrous material such as stainless steel. Preferably, the second susceptor material is primarily used to indicate when the susceptor has reached a specific temperature, which is the Curie temperature of the second susceptor material. The Curie temperature of the second susceptor material can be used to adjust the temperature of the entire susceptor during operation. Thus, the Curie temperature of the second susceptor material must be below the flash point of the aerosol-generating substrate. Materials suitable for the second susceptor material may include nickel and certain nickel alloys.

By providing a susceptor having at least first and second susceptor materials, the second susceptor material has a Curie temperature and the first susceptor material does not have a Curie temperature, or the first and second susceptor materials are distinct from each other. Heating of the aerosol-generating substrate and temperature control of the heating can be separated, with first and second Curie temperatures being The first susceptor material is preferably a magnetic material having a Curie temperature greater than 500°C. It is preferable from the viewpoint of heating efficiency that the Curie temperature of the first susceptor material is above any maximum temperature at which the susceptor must be able to be heated. The second Curie temperature may be selected to be preferably less than 400°C, preferably less than 380°C, or less than 360°C. The second susceptor material is preferably a magnetic material selected to have a second Curie temperature substantially equal to the maximum desired heating temperature. That is, the second Curie temperature is preferably approximately equal to the temperature at which the susceptor must be heated to generate an aerosol from the aerosol-generating substrate. The second Curie temperature may be in the range of 200 °C to 400 °C or 250 °C to 360 °C, for example. The second Curie temperature of the second susceptor material may be selected such that, for example, when heated by the susceptor at the same temperature as the second Curie temperature, the overall average temperature of the aerosol-generating substrate does not exceed 240 °C. .

As briefly described above, in an aerosol-generating article according to the present invention, the wrapper surrounding at least a rod of the aerosol-generating substrate comprises a wrapping base material having a basis weight. At least a treated portion of the wrapper extending between the rod proximal end and the rod distal end comprises a flame retardant composition comprising one or more flame retardant compounds such that the treated portion of the wrapper has a total dry basis weight greater than the dry basis weight of the wrapping base material. . In practice, at least the wrapper surrounding the rod of the aerosol-generating substrate comprises a wrapping base material, and the flame retardant composition is applied onto the wrap base material, or the wrap base material is impregnated with the flame retardant composition, or both. The treated part includes at least about 2 grams of one or more flame retardant compounds per square meter of surface area of the treated part.

As used herein, the term "flame retardant composition" refers to a composition comprising one or more flame retardant compounds.

The term "flame retardant compound" is used herein to describe a chemical compound that, when added to or otherwise incorporated into a substrate such as a paper or plastic compound, provides varying degrees of flammability protection to a substrate. Indeed, flame retardant compounds can be activated by the presence of an ignition source and are adapted to prevent or slow the further occurrence of ignition by a variety of different physical and chemical mechanisms.

Flame retardant compositions may typically further comprise one of a number of non-flame retardant compounds, i.e., one or more compounds - such as solvents, excipients, fillers - which do not actively contribute flammability protection to the substrate, but rather the flame retardant compound or compounds are used to facilitate application onto or into the wrapper or both.

Some of the non-flame retardant compounds of the flame retardant composition - such as solvents - are volatile and may evaporate from the wrapper upon drying after the flame retardant composition has been applied onto or into the wrapping base material or both. As such, while these non-flame retardant compounds form part of the formulation of the flame retardant composition, they may no longer be present or may be detectable only in trace amounts within the wrapper of an aerosol-generating article according to the present invention.

To incorporate the flame retardant composition into a paper-based or polymer-based wrapper, the flame retardant composition is added to the pulp or polymer mixture during the wrapper manufacturing process or, at a later stage, to the wrapper by an application process based on size pressing, spraying, printing, coating, etc. may be added. The flame retardant composition may be applied on one side of the wrapper or on both sides of the wrapper, for example as a coating layer.

A number of suitable flame retardant compounds are known. Some flame retardant compounds, such as mineral flame retardants, act primarily as additive flame retardants and are not chemically attached to the surrounding system. Most of the organohalogen and organophosphate compounds are also permanently unreacted and adhere around them. Reactive flame retardant compounds, such as certain non-halogenated products, are reactive in that they are incorporated into the surrounding system without losing their flame retardant efficiency. This advantageously prevents these materials from being released into the environment.

The wrapping base material of the wrapper surrounding at least the rod of the aerosol-generating substrate may be a paper wrapping base material or a non-paper wrapping base material. In a preferred embodiment, the wrapping base material of the wrapper surrounding at least the rod of the aerosol-generating substrate comprises paper. Suitable paper wrapping base materials 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 wrapping base materials for use in certain embodiments of the present invention are known in the art. sheets of homogenised tobacco material and sheets of certain polymeric materials. In certain implementations, the wrapping base material may be formed from a layered material comprising a plurality of layers.

As an example, the lapping base material may have a basis weight of at least about 20 g/m². Preferably, the lapping base material has a basis weight of at least about 25 g/m². More preferably, the lapping base material has a basis weight of at least about 30 g/m². Even more preferably, the lapping base material has a basis weight of at least about 40 g/m² or at least about 50 g/m². In some embodiments, the lapping base material has a basis weight of at least about 70 g/m².

The lapping base material can have a basis weight of up to about 220 g/m². Preferably, the lapping base material has a basis weight of about 200 g/m² or less. More preferably, the lapping base material has a basis weight of about 180 g/m² or less. Even more preferably, the lapping base material has a basis weight of about 160 g/m2 or less.

In a preferred embodiment, the lapping base material has a basis weight of less than about 150 g/m2, preferably less than about 140 g/m2, even more preferably less than about 130 g/m2, and most preferably less than about 120 g/m2.

In some embodiments, the lapping base material is about 30 g/m² to about 220 g/m², preferably about 40 g/m² to about 220 g/m², more preferably about 50 g/m² to about 220 g/m², even more preferably. may have a basis weight of about 60 g/m² to about 220 g/m². In another embodiment, the lapping base material is about 30 g/m² to about 200 g/m², preferably about 40 g/m² to about 200 g/m², more preferably about 50 g/m² to about 200 g/m², even more preferably. may have a basis weight of about 60 g/m² to about 200 g/m². In a further embodiment, the lapping base material is from about 30 g/m² to about 180 g/m², preferably from about 40 g/m² to about 180 g/m², more preferably from about 50 g/m² to about 180 g/m², even more preferably may have a basis weight of about 60 g/m² to about 180 g/m². In another embodiment, the lapping base material is from about 30 g/m² to about 160 g/m², preferably from about 40 g/m² to about 160 g/m², more preferably from about 50 g/m² to about 160 g/m², even more preferably. Preferably, it may have a basis weight of about 60 g/m² to about 160 g/m².

In a particularly preferred embodiment, the lapping base material may have a basis weight of from about 70 g/m² to about 110 g/m², more preferably from about 80 g/m² to about 110 g/m². In an even more preferred embodiment, the lapping base material may have a basis weight of from about 70 g/m² to about 100 g/m², and even more preferably from about 80 g/m² to about 100 g/m².

In another embodiment, the lapping base material is about 20 g/m² to about 120 g/m², preferably about 25 g/m² to about 120 g/m², more preferably about 30 g/m² to about 120 g/m², even more preferably. may have a basis weight of about 40 g/m² to about 120 g/m², most preferably about 50 g/m² to about 120 g/m². In a further embodiment, the lapping base material is from about 20 g/m² to about 100 g/m², preferably from about 25 g/m² to about 100 g/m², more preferably from about 30 g/m² to about 100 g/m², even more preferably may have a basis weight of about 40 g/m² to about 100 g/m², most preferably about 50 g/m² to about 100 g/m². In a further embodiment, the lapping base material is from about 20 g/m² to about 80 g/m², preferably from about 25 g/m² to about 80 g/m², more preferably from about 30 g/m² to about 80 g/m², even more preferably may have a basis weight of about 40 g/m² to about 80 g/m², most preferably about 50 g/m² to about 80 g/m². In an alternative embodiment, the lapping base material is from about 20 g/m² to about 70 g/m², preferably from about 25 g/m² to about 70 g/m², more preferably from about 30 g/m² to about 70 g/m², even more preferably. Preferably, it may have a basis weight of about 40 g/m² to about 70 g/m², and most preferably about 50 g/m² to about 70 g/m².

In another embodiment, the lapping base material is about 20 g/m² to about 50 g/m², preferably about 25 g/m² to about 50 g/m², more preferably about 30 g/m² to about 50 g/m², even more preferably. may have a basis weight of about 40 g/m² to about 50 g/m².

At least the wrapper surrounding the rod of the aerosol-generating substrate has a total dry basis weight which is the sum of the basis weight of the wrapping base material and the weight of the components of the flame retardant composition present on the surface of the wrapping base material or in the wrapping base material or both. The weight of the components of the flame retardant composition present on or within the wrapper is the total weight of the flame retardant compound or compounds plus the weight of any remaining non-flame retardant compounds. Within the context of the present invention, the weight of a component of a flame retardant composition is also expressed in grams (g) of component per square meter of the wrapping base material.

The ratio of the total weight of the flame retardant compound(s) to the total dry basis weight of the wrapper can be taken as an indication of the concentration of the flame retardant compound(s) in the wrapper.

In an aerosol-generating article according to the present invention, the ratio of the total weight of the flame retardant compound(s) to the total dry basis weight of the wrapper may be at least about 0.02. Preferably, the ratio of the total weight of the flame retardant compound(s) to the total dry basis weight of the wrapper is at least about 0.03. More preferably, the ratio of the total weight of the flame retardant compound(s) to the total dry basis weight of the wrapper is at least about 0.04. Even more preferably, the ratio of the total weight of the flame retardant compound(s) to the total dry basis weight of the wrapper is at least about 0.05.

Preferably, the ratio of the total weight of the flame retardant compound(s) to the total dry basis weight of the wrapper is about 0.20 or less. More preferably, the ratio of the total weight of the flame retardant compound(s) to the total dry basis weight of the wrapper is about 0.15 or less. Even more preferably, the ratio of the total weight of the flame retardant compound(s) to the total dry basis weight of the wrapper is about 0.10 or less.

In some embodiments, the ratio of the total weight of flame retardant compound(s) to the total dry basis weight of the wrapper is from about 0.02 to about 0.20, preferably from about 0.03 to about 0.20, more preferably from about 0.04 to about 0.20, and even more. Preferably it may be about 0.05 to about 0.20. In another embodiment, the ratio of the total weight of the flame retardant compound(s) to the total dry basis weight of the wrapper is from about 0.02 to about 0.15, preferably from about 0.03 to about 0.15, more preferably from about 0.04 to about 0.15, and even more. Preferably it may be about 0.05 to about 0.15. In a further embodiment, the ratio of the total weight of the flame retardant compound(s) to the total dry basis weight of the wrapper is from about 0.02 to about 0.10, preferably from about 0.03 to about 0.10, more preferably from about 0.04 to about 0.10, and even more. Preferably it may be about 0.05 to about 0.10.

In aerosol-generating articles according to the present invention, the flame retardant composition is provided within the treated portion of the wrapper. This means that the flame retardant composition has been applied onto or into a corresponding part of the wrapping base material or both. Thus, in the treated portion, the wrapper has an overall dry basis weight greater than the dry basis weight of the wrapping base material.

The treated portion of the wrapper may extend over at least about 10% of the outer surface area of the rod of aerosol-generating substrate surrounded by the wrapper. Preferably, the treated portion of the wrapper extends over at least about 20% of the outer surface area of the rod of aerosol-generating substrate surrounded by the wrapper. More preferably, the treated portion of the wrapper extends over at least about 40% of the outer surface area of the rod of aerosol-generating substrate. Even more preferably, the treated portion of the wrapper extends over at least about 60% of the outer surface area of the rod of aerosol-generating substrate. Most preferably, the treated portion of the wrapper extends over at least about 80% of the outer surface area of the rod of aerosol-generating substrate.

In particularly preferred embodiments, the treated portion of the wrapper extends over at least about 90% of the outer surface area of the rod of the aerosol-generating substrate. Even more preferably, the treated portion of the wrapper extends over at least about 95% of the outer surface area of the rod of the aerosol-generating substrate. Most preferably, the treated portion of the wrapper extends substantially over the entire outer surface area of the rod of the aerosol-generating substrate.

The length of the treated area may be at least about 10% of the length of the rod of the aerosol-generating substrate. Preferably, the length of the treated area is at least about 20% of the length of the rod of the aerosol-generating substrate. More preferably, the length of the treated area is at least about 40% of the length of the rod of the aerosol-generating substrate. Even more preferably, the length of the treated area is at least about 60% of the length of the rod of the aerosol-generating substrate. Most preferably, the length of the treated area is at least about 80% of the length of the rod of the aerosol-generating substrate.

In particularly preferred embodiments, the length of the treated area is at least about 90% of the length of the rod of the aerosol-generating substrate. Even more preferably, the length of the treated area is at least about 95% of the length of the rod of the aerosol-generating substrate. Most preferably, the length of the treated area is substantially equal to the length of the rod of the aerosol-generating substrate.

As noted above, the treated portion of the wrapper in an aerosol-generating article according to the present invention comprises at least about 2.0 g of a flame retardant compound or compounds per square meter of surface area of the treated portion. Preferably, the treated portion of the wrapper comprises at least about 2.5 grams of flame retardant compound or compounds per square meter of surface area of the treated portion. More preferably, the treated portion of the wrapper has at least about 3.0 grams of flame retardant compound or compounds per square meter of surface area of the treated portion, or more preferably, at least about 4.0 grams of flame retardancy per square meter of surface area of the treated portion. Includes a compound or compounds. In a particularly preferred embodiment, the treated portion of the wrapper comprises at least about 5.0 grams of flame retardant compound or compounds per square meter of surface area of the treated portion.

Preferably, the treated portion of the wrapper contains no more than about 12 grams of flame retardant compound or compounds per square meter of surface area of the treated portion. More preferably, the treated portion of the wrapper contains no more than about 10 grams of flame retardant compound or compounds per square meter of surface area of the treated portion. Even more preferably, the treated portion of the wrapper contains no more than about 8 grams of a flame retardant compound or compounds per square meter of surface area of the treated portion.

In some embodiments, the treated portion of the wrapper contains from about 2.0 grams to about 12 grams of flame retardant compound or compounds per square meter of surface area of the treated portion, and even more preferably from about 3.0 grams to about 10 grams per square meter of surface area of the treated portion. Contains 12 g of flame retardant compound or compounds.

In another embodiment, the treated portion of the wrapper is coated with from about 2.0 grams to about 10 grams of flame retardant compound or compounds per square meter of surface area of the treated portion, and even more preferably from about 3.0 grams to about 10 grams per square meter of surface area of the treated portion. Contains 120 g of flame retardant compound or compounds.

In another embodiment, the treated portion of the wrapper is coated with from about 2.0 grams to about 8 grams of flame retardant compound or compounds per square meter of surface area of the treated portion, and even more preferably from about 3.0 grams to about 3 grams per square meter of surface area of the treated portion. Contains 8 g of flame retardant compound or compounds.

Depending on the concentration of the flame retardant compound or compounds in the flame retardant composition, different amounts of the flame retardant composition may be applied to achieve loading of the flame retardant compound or compounds in the treated portion of the aforementioned wrapper. For example, at least about 10 grams of the flame retardant composition can be applied onto the treated part per square meter of surface area of the treated part.

Preferably, at least about 12 grams of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. More preferably, at least about 14 grams of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. Even more preferably, at least about 16 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. In a particularly preferred embodiment, at least about 18 g or at least about 20 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part.

Preferably, no more than about 35 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. More preferably, no more than about 30 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. Even more preferably, no more than about 25 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part.

In some embodiments, from about 10 g to about 35 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. Preferably, from about 12 g to about 35 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. More preferably, from about 14 g to about 35 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. Even more preferably, from about 16 g to about 35 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. In a particularly preferred embodiment, from about 18 g to about 35 g or from about 20 g to about 35 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part.

In another embodiment, from about 10 g to about 30 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. Preferably, from about 12 g to about 30 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. More preferably, from about 14 g to about 30 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. Even more preferably, from about 16 g to about 30 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. In a particularly preferred embodiment, from about 18 g to about 30 g or from about 20 g to about 30 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part.

In a further embodiment, from about 10 g to about 25 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. Preferably, from about 12 g to about 25 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. More preferably, from about 14 g to about 25 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. Even more preferably, from about 16 g to about 25 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part. In a particularly preferred embodiment, from about 18 g to about 25 g or from about 20 g to about 25 g of the flame retardant composition is applied onto the treated part per square meter of surface area of the treated part.

에서 저항 가열식 코일을 사용하여 적어도 5초 동안, 바람직하게는 30초 동안 에어로졸 발생 물품이 가열될 때, 에어로졸 발생 물품이 점화되지 않도록 하는 것이다. 용어 "점화하지 않는다"는 특히 에어로졸 발생 기재를 둘러싸는 래퍼의 연소가 개시되지 않고, 화염이 검출되지 않는 것을 의미하기 위해 본원에서 사용된다.In the aerosol-generating article according to the present invention, the content of the flame retardant compound or compounds in the treated portion is preferably 500

to prevent ignition of the aerosol-generating article when the aerosol-generating article is heated for at least 5 seconds, preferably for 30 seconds, using a resistive heating coil in The term “does not ignite” is used herein specifically to mean that combustion of the wrapper surrounding the aerosol-generating substrate is not initiated and no flame is detected.

Preferably, an aerosol-generating article according to the present invention when submitted to the Department of Health Canada Intense regime includes a pre-writing step using resistively heated coils, and 100% of the ventilation zones on the aerosol-generating article (if present) are blocked. It is not ignited in the puff regime of 55 milliliters every 30 seconds and one puff lasting 2 seconds. Further details on “smoking” parameters and standard test conditions are provided in ISO 3308:2000 (Routine Analysis Cigarette Smoking Machines—Definitions and Standard Conditions).

In some embodiments, the wrapper comprises a wrapping base material, and a layer comprising a flame retardant compound or compounds is provided on a surface of the wrapping base material facing the aerosol-generating substrate. In another embodiment, the wrapper comprises a wrapping base material and a layer comprising a flame retardant compound or compounds is provided on the surface of the wrapping base material facing away from the aerosol-generating substrate. In a further embodiment, the wrapper comprises a wrapping base material, and a layer comprising a flame retardant compound or compounds is provided on both surfaces of the wrapping base material.

A number of suitable flame retardant compounds will be known to those skilled in the art. In particular, several flame retardant compounds and formulations suitable for treating cellulosic materials are known and disclosed and can be used in the manufacture of wrappers for aerosol-generating articles according to the present invention.

In some embodiments, the flame retardant composition is a mixed salt or salt based on at least one mono, di- and/or tri-carboxylic acid, at least one polyphosphoric acid, pyrophosphoric acid and/or phosphoric acid, and a hydroxide or salt of an alkali or alkaline earth metal. A polymer, wherein said hydroxide or salt with at least one mono, di- and/or tri-carboxylic acid forms a carboxylate, and wherein said hydroxide or salt with at least one polyphosphoric acid, pyrophosphoric acid and/or phosphoric acid is form phosphate.

Preferably, in this embodiment, the flame retardant composition further comprises a carbonate of an alkali or alkaline earth metal.

In another embodiment, the flame retardant composition comprises cellulose modified with at least one C ₁₀ or higher fatty acid, tall oil fatty acid (TOFA), phosphorylated flaxseed oil, phosphorylated downstream corn oil. Preferably, the at least one C ₁₀ or higher fatty acid is selected from the group consisting of capric acid, myristic acid, palmitic acid, and combinations thereof.

As briefly described above, the aerosol-generating article of the present invention further comprises a downstream section at a location downstream of the rod of the aerosol-generating substrate. A downstream section may include one or more downstream elements.

According to the invention, the downstream section of the aerosol-generating article may in particular comprise a mouthpiece element positioned downstream of the rod of the aerosol-generating substrate and longitudinally aligned with the rod of the aerosol-generating substrate.

The mouthpiece element is preferably located at the mouth end or downstream end of the aerosol-generating article and extends completely to the mouth end of the aerosol-generating article.

Preferably, the mouthpiece element comprises at least one mouthpiece filter segment of fibrous filtering material for filtering aerosols emitted from the aerosol-generating substrate. Suitable fibrous filtration materials will be known to those skilled in the art. Particularly preferably, the at least one mouthpiece filter segment comprises a cellulose acetate filter segment formed from cellulose acetate tow.

In certain preferred embodiments, the mouthpiece element is comprised of a single mouthpiece filter segment. In an alternative embodiment, the mouthpiece element includes two or more mouthpiece filter segments axially aligned in end-to-end relationship that abut one another.

In certain embodiments of the invention, the downstream section may include a mouth end cavity at its downstream end, downstream of the mouthpiece element, as described above. The mouth end cavity may be defined by a hollow tubular element provided at the downstream end of the mouthpiece. Alternatively, the mouth end cavity may be defined by an outer wrapper of the mouthpiece element, the outer wrapper extending downstream from the mouthpiece element.

The mouthpiece component may optionally include a flavoring agent, which may be provided in any suitable form. For example, a mouthpiece element may include one or more capsules, beads or granules of a flavoring agent, or threads or filaments loaded with one or more flavoring agents.

In certain preferred embodiments, the downstream section of the aerosol-generating article further comprises a support element located immediately downstream of the rod of the aerosol-generating substrate. The mouthpiece element is preferably located downstream of the support element.

The support element may be formed from any suitable material or combination of materials. For example, the support element may include cellulose acetate; cardboard; crimped paper, such as crimped heat-resistant paper or crimped parchment paper; and polymeric materials such as low density polyethylene (LDPE). In a preferred embodiment, the support element is formed from cellulose acetate. Other suitable materials include polyhydroxyalkanoate (PHA) fibers.

The support element may include the first hollow tubular segment. In a preferred embodiment, the support element comprises a hollow cellulose acetate tube.

The support element is arranged substantially aligned with the rod. This means that the length dimension of the support element is arranged approximately parallel to the longitudinal direction of the rod, for example within +/- 10 degrees parallel to the longitudinal direction of the rod. In a preferred embodiment, the support element extends along the longitudinal axis of the rod.

The support element preferably has an outer diameter approximately equal to the outer diameter of the rod of the aerosol-generating substrate and the outer diameter of the aerosol-generating article.

The peripheral wall of the support element may have a thickness of at least 1 mm, preferably at least about 1.5 mm, more preferably at least about 2 mm.

The support element may have a length of about 5 mm to about 15 mm.

Preferably, the support element has a length of at least about 6 mm, preferably at least about 7 mm.

In a preferred embodiment, the support element has a length of less than about 12 mm, more preferably less than about 10 mm.

In some embodiments, the support element has a length of about 5 mm to about 15 mm, preferably about 6 mm to about 15 mm, more preferably about 7 mm to about 15 mm. In another embodiment, the support element has a length 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 a further embodiment, the support element has a length 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 preferred embodiment, the support element has a length of about 8 mm.

In some embodiments, the downstream section further comprises an aerosol cooling element located immediately downstream of the support element. The mouthpiece element is preferably located downstream of both the support element and the aerosol cooling element. Particularly preferably, the mouthpiece element is located immediately downstream of the aerosol cooling element. As an example, the mouthpiece element may abut the downstream end of the aerosol cooling element.

The aerosol cooling element is arranged substantially aligned with the rod. This means that the longitudinal dimension of the aerosol-cooling element is arranged approximately parallel to the longitudinal direction of the rod, for example within +/- 10 degrees parallel to the longitudinal direction of the rod. In a preferred embodiment, the aerosol cooling element extends along the longitudinal axis of the rod.

The aerosol-cooling element preferably has an outer diameter approximately equal to the outer diameter of the rod of the aerosol-generating substrate and the outer diameter of the aerosol-generating article.

In some embodiments, the aerosol cooling element is in the form of a hollow tubular segment defining a cavity extending completely from an upstream end of the aerosol cooling element to a downstream end of the aerosol cooling element, and a ventilation zone is provided at a location along the hollow tubular segment.

As used herein, the term "hollow tubular segment" is used to refer to a generally elongated element that defines a lumen or airflow passage along its longitudinal axis. In particular, the term "tubular" will be used hereinafter with reference to a tubular element having a substantially cylindrical cross-section and defining at least one airflow conduit 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.

The hollow tubular segments provide unrestricted flow channels. This means that the hollow tubular segments provide negligible resistance to draw (RTD). 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.

When used to describe an aerosol-cooling element, the term "elongated" means that the aerosol-cooling element has a length dimension greater than its width dimension or its diameter dimension, eg, a length greater than twice its width dimension or its diameter dimension. means that

The peripheral wall of the aerosol cooling element may have a thickness of less than about 2.5 mm, preferably less than about 1.5 mm, more preferably less than about 1250 μm, and even more preferably less than about 1000 μm. In a particularly preferred embodiment, the peripheral wall of the aerosol cooling element has a thickness of less than about 900 μm, preferably less than about 800 μm.

The aerosol cooling element may have a length of 5 mm to 15 mm.

Preferably, the aerosol cooling element has a length of at least about 6 mm, more preferably at least about 7 mm.

In a preferred embodiment, the aerosol cooling element has a length of less than about 12 mm, more preferably less than about 10 mm.

In some embodiments, the aerosol cooling element has a length of about 5 mm to about 15 mm, preferably about 6 mm to about 15 mm, more preferably about 7 mm to about 15 mm. In another embodiment, the aerosol cooling element has a length 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 a preferred embodiment, the aerosol cooling element has a length 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 particularly preferred embodiment of the present invention, the aerosol cooling element has a length of less than 10 mm. For example, in a particularly preferred embodiment, the aerosol cooling element has a length of 8 mm. Accordingly, in this embodiment, the aerosol-cooling element has a relatively short length compared to the aerosol-cooling elements of prior art aerosol-generating articles. A reduction in the length of the aerosol-cooling element is possible due to the optimized effect of the hollow tubular segment forming the aerosol-cooling element in cooling and nucleation of the aerosol. Reducing the length of the aerosol-cooling element advantageously reduces the risk of deformation of the aerosol-generating article due to compression during use, as the aerosol-cooling element typically has a lower resistance to deformation than the mouthpiece. Reducing the length of the aerosol cooling element may also provide a cost advantage to the manufacturer, as the cost of a hollow tubular segment is typically higher per unit length than the cost of other elements, such as mouthpiece elements.

The ratio between the length of the aerosol-cooling element and the length of the rod of the aerosol-generating substrate may be from about 0.25 to about 1.

The aerosol cooling element may be formed from any suitable material or combination of materials. For example, an aerosol cooling element may be cellulose acetate; cardboard; crimping paper such as crimped heat-resistant paper or crimped parchment paper; and polymeric materials such as low density polyethylene (LDPE). Other suitable materials include polyhydroxyalkanoate (PHA) fibers.

In a preferred embodiment, the aerosol cooling element is formed from cellulose acetate.

The ventilation zone includes a plurality of perforations through the peripheral wall of the aerosol cooling element. Preferably, the ventilation zone comprises at least one row of circumferential perforations. In some embodiments, the ventilation zone may include, for example, two circumferential rows of perforations. For example, the perforations may be formed on-line during manufacture of the aerosol-generating article. Preferably, each row of circumferential perforations contains from 8 to 30 perforations.

Aerosol-generating articles according to the present invention may have ventilation levels of at least about 5%.

The term “ventilation level” is used throughout this specification to denote the volume ratio between the airflow entering an aerosol-generating article through a ventilation zone (ventilation airflow) and the sum of the aerosol airflow and the ventilation airflow. The greater the ventilation level, the higher the dilution of the aerosol stream delivered to the consumer.

Preferably, aerosol-generating articles according to the present invention may have a ventilation level of at least about 10%, more preferably at least about 15%, and even more preferably at least about 20%. In particularly preferred embodiments, aerosol-generating articles according to the present invention have a ventilation level of at least about 25%. Without being bound by theory, the inventors have discovered that the temperature drop caused by introducing cooler outside air into the hollow tubular segments through the ventilation zone can have a beneficial effect on the nucleation and growth of aerosol particles. Rapid cooling induced by introducing outside air into the hollow tubular segments through ventilation zones 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 some embodiments, the aerosol-generating article may further include additional cooling elements defining a plurality of longitudinally extending channels, such as to make the high surface area available for heat exchange. That is, one such additional cooling element is adapted to function substantially as a heat exchanger. A plurality of longitudinally extending channels may be defined by sheet material that is pleated, gathered, or folded to form the channels. A plurality of longitudinally extending channels may be defined by a single sheet that is bent, pleated, and folded to form a plurality of channels. The sheet may also be crimped prior to being bent, crimped or folded. Alternatively, the plurality of longitudinally extending channels may be defined by a plurality of sheets forming the plurality of channels through crimping, bending, pleating, or folding. In some embodiments, the plurality of longitudinally extending channels is formed by multiple sheets crimped, bent, crimped or folded together, i.e. two sheets crimped, bent, crimped or folded into one then in an overlapping arrangement. It can be defined by more than one sheet. As used herein, the term 'sheet' refers to a laminated element having a width and length substantially greater than its thickness.

In another embodiment, the aerosol cooling element may be provided in the form of one such cooling element comprising a plurality of longitudinally extending channels.

One such additional cooling element may have a total surface area between about 300 mm²/mm in length and about 1000 mm²/mm in length.

The additional cooling element preferably comprises a sheet material selected from the group comprising metal foil, polymer sheet, and substantially non-porous paper or cardboard. In some embodiments, the aerosol cooling element is made of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA), and aluminum foil. It may include a sheet material selected from the group consisting of In a particularly preferred embodiment, the additional cooling element comprises a sheet of PLA.

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 rod of aerosol-generating substrate.

The aerosol-generating article of the present invention preferably includes an upstream element located upstream of and adjacent to the aerosol-generating substrate, the upstream section including at least one upstream element. The upstream element advantageously prevents 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 element 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 upstream elements helps prevent any loss of substrate.

The upstream element may also provide an improved appearance to the upstream end of the aerosol-generating article. Also, if desired, the upstream element 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 element may be a porous plug element. Preferably, the porous plug element does not alter the resistance to draw of the aerosol-generating article. Preferably, the upstream element has a porosity of at least 50% in the longitudinal direction of the aerosol-generating article. More preferably, the upstream element has a porosity of about 50% to about 90% in the longitudinal direction. The porosity of the upstream element in the longitudinal direction is defined by the ratio of the cross-sectional area of the material forming the upstream element to the internal cross-sectional area of the aerosol-generating article at the location of the upstream element.

The upstream element may be made of a porous material or may include a plurality of openings. This can be achieved, for example, through laser drilling. Preferably, the plurality of apertures are evenly distributed throughout the cross-section of the upstream element.

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

Preferably, the RTD of the upstream element is at least about 5 mm H ₂ O. More preferably, the RTD of the upstream element is at least about 10 mm H ₂ O. Even more preferably, the RTD of the upstream element is at least about 15 mm H ₂ O. In a particularly preferred embodiment, the RTD of the upstream element is at least about 20 mm H ₂ O.

More preferably, the RTD of the upstream element is less than or equal to about 80 mm H ₂ O. More preferably, the RTD of the upstream element is less than or equal to about 60 mm H ₂ O. Even more preferably, the upstream element has an RTD of less than or equal to about 40 mm H ₂ O.

In an alternative implementation, the upstream element may be formed from a material that is impermeable 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 element may be made of any material suitable for use in an aerosol-generating article. The upstream element may be made of the same material used for one of the other components of the aerosol-generating article, such as, for example, the mouthpiece, cooling element or support element. Suitable materials for forming the upstream element are filter materials, ceramics, polymeric materials, cellulose acetate, cardboard, zeolites. or an aerosol-generating substrate. Preferably, the upstream element is formed from a plug of cellulose acetate.

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

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

Preferably, the upstream element has a length of about 1 mm to about 10 mm, more preferably about 3 mm to about 8 mm, more preferably about 4 mm to about 6 mm. In a particularly preferred embodiment, the upstream element has a length of about 5 mm. The length of the upstream element 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 element may be increased to maintain the same overall length of the article.

The upstream element is preferably surrounded by a wrapper. The wrapper surrounding the upstream element 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 elements.

Preferably, in an aerosol-generating article according to the present invention, the wrapper is free of metal. As used herein, with reference to the present invention, the term "metal" refers to the content of the metal in its zero oxidation state, i.e., the content of the metal in the wrapper as an element in glass form. Thus, the content of a metal, such as, for example, an alkali metal or an alkaline earth metal, may be present in ionic form or bound to another element of one or more flame retardant compounds of a flame retardant composition, encompassed by the term "metal" as used herein. It doesn't work.

That is, the wrapper of an aerosol-generating article according to the present invention is preferably free of any metal in its zero oxidation state.

Thus, the aerosol-generating article according to the present invention advantageously does not comprise a metal foil acting as a heat shield element. In particular, the aerosol-generating substrate is not surrounded by one such metal foil heat shield element.

An aerosol-generating article according to the present invention as described above may be manufactured by a method comprising a first step of providing a continuous rod of an aerosol-generating substrate. One such method includes a second step of surrounding a continuous rod of aerosol-generating substrate with a wrapper, the wrapper comprising a wrapping base material having a dry basis weight. The method comprises treating at least a portion of a wrapper with a flame retardant composition comprising one or more flame retardant compounds to provide a treated portion of the wrapper wherein the treated portion of the wrapper has an overall dry basis weight greater than the dry basis weight of the wrapping base material. Including 3 additional steps. In addition, a fourth step of cutting the treated wrapped continuous rod of the aerosol-generating substrate into individual rods, each individual rod extending from a respective rod proximal end to a respective rod distal end upstream of the respective rod proximal end. include The treated portion of the wrapper includes at least about 2 grams of one or more flame retardant compounds per square meter of surface area of the treated portion.

The flame retardant composition may be applied onto at least one side of the wrapping base material of the wrapper by a size pressing, spraying, printing or coating based application process.

Aerosol-generating articles according to the present invention find use, inter alia, in aerosol-generating systems comprising an aerosol-generating article and an electrically operated aerosol-generating device, the aerosol-generating device receiving an aerosol-generating article such that the aerosol-generating substrate of the article is heated. An elongated heating chamber configured to be heated within the chamber and a heater.

In some embodiments, the heater may be adapted to be inserted into the aerosol-generating substrate of the article when the article is received into the heating chamber. As an example, the heater may be in the form of a heating rod or fin.

In another embodiment, the heater may include a substantially cylindrical, elongated heating element, with heating chambers disposed about the circumferential longitudinal surface of the heater. Thus, during use, the thermal energy supplied by the heater moves radially outward from the surface of the heater into the heating chamber and into the aerosol-generating article. However, other shapes and configurations of heaters and heating chambers may alternatively be used. The heater may include a plurality of individual heating elements, the various heating elements being operable independently of each other such that different elements may be activated at different times to heat the aerosol-generating article. As an example, a heater may include a plurality of axially aligned heating elements, which provide a plurality of independent heating zones along the length of the heater. Each heating element may have a length that is significantly less than the overall length of the heater. Thus, when one individual heating element is activated, it supplies thermal energy to a portion of the aerosol-generating substrate located radially in the vicinity of the heating element without substantially heating the remainder of the aerosol-generating substrate. Thus, different parts of the aerosol-generating substrate can be heated independently and at different times.

Alternatively or additionally, the heater may include a plurality of elongated longitudinally extending heating elements at different locations about the longitudinal axis of the heater. Thus, when one individual heating element is activated, it supplies thermal energy to a longitudinal portion of the aerosol-generating substrate lying substantially parallel to and adjacent to the heating element. This arrangement also allows independent heating of the aerosol-generating substrate in separate parts.

In some of these embodiments that include a heater element disposed at a peripheral location relative to the heating chamber, the aerosol-generating system further insulates means arranged between the heating chamber and the exterior of the device to reduce heat loss from the heated aerosol-generating substrate. can be included with

In a further embodiment, the aerosol-generating article comprises a susceptor arranged within the aerosol-generating substrate, the susceptor being in thermal contact with the aerosol-generating substrate, and the heater is in the form of an induction heating device comprising one or more induction coils. The electromagnetic energy emitted by the induction coil is absorbed by the susceptor and converted to heat, which is then transferred to the aerosol-generating substrate primarily by conduction.

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.

The aerosol-generating article 10 shown in FIG. 1 includes a rod 12 of an aerosol-generating substrate 12 and a downstream section 14 located downstream of the rod 12 of the aerosol-generating substrate. The aerosol-generating article 10 also includes an upstream section 16 at a position upstream of the rod 12 of the aerosol-generating substrate. Accordingly, the aerosol-generating article 10 extends from an upstream or distal end 18 to a downstream or mouth end 20 .

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

The downstream section 14 includes a support element 22 located immediately downstream of the rod 12 of the aerosol-generating substrate, the support element 22 being longitudinally aligned with the rod 12 . In the embodiment of FIG. 1 , the upstream end of the support element 18 abuts the downstream end of the rod 12 of the aerosol-generating substrate. The downstream section 14 also includes an aerosol cooling element 24 located immediately downstream of the support element 22, the aerosol cooling element 24 longitudinally with the rod 12 and the support element 22. sorted In the embodiment of FIG. 1 , the upstream end of the aerosol cooling element 24 abuts the downstream end of the support element 22 . In the embodiment of FIG. 1 , the support element 22 and the aerosol-cooling element 24 together define a middle hollow section 50 of the aerosol-generating article 10 .

Support element 22 comprises a first hollow tubular segment 26 . The first hollow tubular segment 26 is provided in the form of a hollow cylindrical tube made of cellulose acetate. The first hollow tubular segment 26 defines an internal cavity 28 extending completely from the upstream end 30 of the first hollow tubular segment to the downstream end 32 of the first hollow tubular segment 20 . The interior cavity 28 is substantially empty, so that a substantially unrestricted airflow is activated along the interior cavity 28 .

The first hollow tubular segment 26 has a length of about 8 mm, an outer diameter of about 7.25 mm, and an inner diameter of about 1.9 mm. Thus, the thickness of the peripheral wall of the first hollow tubular segment 26 is about 2.67 mm.

The aerosol cooling element 24 includes a second hollow tubular segment 34 . The second hollow tubular segment 34 is provided in the form of a hollow cylindrical tube made of cellulose acetate. The second hollow tubular segment 34 defines an internal cavity 36 extending completely from the upstream end 38 of the hollow tubular segment to the downstream end 40 of the second hollow tubular segment 34 . The interior cavity 36 is substantially empty, so that a substantially unrestricted airflow is activated along the interior cavity 36 .

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

The aerosol-generating article 10 includes a ventilation zone 60 provided at a location along the second hollow tubular segment 34 . More specifically, a ventilation zone is provided about 2 mm from the upstream end of the second hollow tubular segment 34 . The ventilation level of the aerosol-generating article 10 is about 25%.

In the embodiment of FIG. 1 , the downstream section 14 further includes a mouthpiece element 42 at a location downstream of the middle hollow section 50 . More specifically, the mouthpiece element 42 is located immediately downstream of the aerosol cooling element 24 . As shown in the view of FIG. 1 , the upstream end of the mouthpiece element 42 abuts the downstream end 40 of the aerosol cooling element 18 .

The mouthpiece element 42 is provided in the form of a cylindrical plug of low density cellulose acetate. Mouthpiece element 42 has a length of about 12 mm and an outer diameter of about 7.25 mm.

Rod 12 includes an aerosol-generating substrate of one of the types described above. The density of the aerosol-generating substrate is about 600 mg/cm3.

The rod 12 of the aerosol-generating substrate has an outer diameter of about 7.25 mm and a diameter of about 12 mm.

The aerosol-generating article 10 further includes an elongate susceptor 44 within the rod 12 of the aerosol-generating substrate. More specifically, the susceptor 44 is arranged substantially longitudinally within the aerosol-generating substrate, eg approximately parallel to the longitudinal direction of the rod 12 . As shown in the diagram of FIG. 1 , the susceptor 44 is located at a radially central location within the rod and extends effectively along the longitudinal axis of the rod 12 . More specifically, the susceptor 44 is in thermal contact with the aerosol-generating substrate. The susceptor 44 extends completely from the upstream end of the rod 12 to the downstream end. In practice, the susceptor 44 has substantially the same length as the rod 12 of the aerosol-generating substrate.

In the embodiment of FIG. 1 , the susceptor 44 is provided in the form of a strip and has a length of about 12 mm, a thickness of about 60 μm, and a width of about 4 mm.

The upstream section 16 includes an upstream element 46 located immediately upstream of the rod 12 of the aerosol-generating substrate, the upstream element 46 being longitudinally aligned with the rod 12 . In the embodiment of FIG. 1 , the downstream end of the upstream element 46 abuts the upstream end of the rod 12 of the aerosol-generating substrate. This advantageously prevents the susceptor 44 from coming off. It also ensures that the consumer does not accidentally come into contact with the heated susceptor 44 after use.

Upstream element 46 is provided in the form of a cylindrical plug of cellulose acetate surrounded by a rigid wrapper. Upstream element 46 has a length of about 5 mm. The RTD of the upstream element 46 is about 30 mm H ₂ O.

As shown in the view of FIG. 1 , the aerosol-generating article 10 further comprises a wrapper 70 surrounding the rod 12 of the aerosol-generating substrate. The wrapper 70 includes a wrapping base material having a basis weight of about 90 g/m². Wrapper 70 also includes a flame retardant composition comprising one or more flame retardant compounds.

More specifically, the flame retardant composition is provided at least within the treated portion 72 of the wrapper extending between the proximal and distal ends of the rod 12 of the aerosol-generating substrate. Treated portion 72 includes about 3.5 grams of one or more flame retardant compounds per square meter of surface area of treated portion 72 . Thus, the treated portion 72 of the wrapper 70 has an overall basis weight greater than the basis weight of the wrapping base material. 1 , the treated portion 72 has a length that substantially matches the length of the rod 12 of the aerosol-generating substrate and extends substantially over the entire outer surface area of the rod 12 of the aerosol-generating substrate. do.

The aerosol-generating article 110 shown in FIG. 2 has a number of features in common with the aerosol-generating article 10 of FIG. 1 and will only be described below where it differs from the aerosol-generating article 10 .

As shown in FIG. 2 , the aerosol-generating article 110 includes a rod 12 of an aerosol-generating substrate 12 and a modified downstream section 114 located downstream of the rod 12 of the aerosol-generating substrate. do. Also, the aerosol-generating article 110 does not include an upstream section.

Like the downstream section 14 of the aerosol-generating article 10, the modified downstream section 114 of the aerosol-generating article 110 includes a support element 22 located immediately downstream of the rod 12 of the aerosol-generating substrate. wherein the support element 22 is longitudinally aligned with the rod 12, the upstream end of the support element 22 abutting the downstream end of the rod 12 of the aerosol-generating substrate.

The modified downstream section 114 also includes an aerosol-cooling element 124 located immediately downstream of the support element 22, the aerosol-cooling element 124 comprising a rod 12 and a support element 22 and a length sorted in the direction More specifically, the upstream end of the aerosol cooling element 124 abuts the downstream end of the support element 22 .

In contrast to the downstream section 14 of the aerosol-generating article 10, the aerosol-cooling element 124 of the modified downstream section 114 provides a plurality of aerosol-cooling elements 124 that provide low or substantially ineffective resistance to the passage of air through the rod. It includes channels extending in the longitudinal direction. More specifically, the aerosol cooling element 124 is preferably formed from a non-porous sheet material selected from the group comprising metal foils, polymeric sheets, and substantially non-porous paper or paperboard. In particular, in the embodiment illustrated in FIG. 2 , the aerosol cooling element 124 is provided in the form of a crimped and pleated polylactic acid (PLA) sheet. The aerosol cooling element 124 has a length of about 8 mm and an outer diameter of about 7.25 mm.

Similar to the embodiment of FIG. 1 , the aerosol-generating article 110 of FIG. 2 further includes a wrapper 70 surrounding the rod 12 of the aerosol-generating substrate. The wrapper 70 includes a wrapping base material having a basis weight of about 90 g/m². Wrapper 70 also includes a flame retardant composition comprising one or more flame retardant compounds.

More specifically, the flame retardant composition is provided at least within the treated portion 72 of the wrapper extending between the proximal and distal ends of the rod 12 of the aerosol-generating substrate. Treated portion 72 includes about 3.5 grams of one or more flame retardant compounds per square meter of surface area of treated portion 72 . Thus, the treated portion 72 of the wrapper 70 has an overall basis weight greater than the basis weight of the wrapping base material. 1 , the treated portion 72 has a length that substantially matches the length of the rod 12 of the aerosol-generating substrate and extends substantially over the entire outer surface area of the rod 12 of the aerosol-generating substrate. do.

Claims (18)

An aerosol-generating article for generating an inhalable aerosol upon heating, the aerosol-generating article comprising:
A rod of an aerosol-generating substrate extending from a rod proximal end to a rod distal end upstream of the rod proximal end, wherein the aerosol-generating substrate comprises at least an aerosol former, wherein the aerosol-former content of the aerosol-generating substrate is on a dry weight basis. at least 10% of the load of an aerosol-generating substrate;
a downstream section at a location downstream of the rod of the aerosol-generating substrate; and
a wrapper surrounding at least said rod of aerosol-generating substrate, said wrapper comprising a wrapping base material having a dry basis weight;
at least a treated portion of the wrapper extending between the rod proximal end and the rod distal end comprises one or more flame retardant compounds such that the treated portion of the wrapper has a total dry basis weight greater than the dry basis weight of the wrapping base material. comprising a flame retardant composition;
wherein the treated part comprises about 2 grams of at least one flame retardant compound per square meter of surface area of the treated part. 2. An aerosol-generating article according to claim 1, wherein the treated portion comprises at least about 3 grams of one or more flame retardant compounds per square meter of surface area of the treated portion. 3. An aerosol-generating article according to claim 1 or 2, wherein the treated part comprises up to about 12 grams of at least one flame retardant compound per square meter of surface area of the treated part. 4. An aerosol-generating article according to any preceding claim, wherein the basis weight of the wrapping base material is at least about 20 grams per square meter. 5. An aerosol-generating article according to any preceding claim, wherein the basis weight of the wrapping base material is at least about 40 grams per square meter or less. 6. An aerosol-generating article according to any preceding claim, wherein the treated portion extends over at least 90% of the outer surface area of the rod of the aerosol-generating substrate. 7. An aerosol-generating article according to any preceding claim, wherein the length of the treated portion is at least about 90% of the length of the aerosol-generating substrate rod. 8. The method according to any one of claims 1 to 7, wherein the wrapper is provided on a surface of the wrapping base material facing the aerosol-generating substrate, a surface of the wrapping base material not facing the aerosol-generating substrate, or both. An aerosol-generating article comprising a layer comprising a flame retardant composition. 9. The flame retardant composition according to any one of claims 1 to 8, wherein the flame retardant composition comprises at least one mono-, di- and/or tri-carboxylic acid, at least one polyphosphoric acid, pyrophosphoric acid and/or phosphoric acid, and mixed salts and polymers based on hydroxides or salts of alkali or alkaline earth metals, wherein said hydroxides or salts with at least one mono-carboxylic acid, di-carboxylic acid, and/or tri-carboxylic acid form a carboxylate; wherein the at least one polyphosphoric acid, pyrophosphoric acid and/or phosphoric acid and the hydroxide or salt form a phosphate salt. 10. The aerosol-generating article of claim 9, wherein the flame retardant composition further comprises a carbonate of an alkali or alkaline earth metal. 9. The method of any one of claims 1 to 8, wherein the flame retardant composition is composed of at least one C ₁₀ or higher fatty acid, tall oil fatty acid (TOFA), phosphorylated linseed oil, phosphorylated downstream corn oil. An aerosol-generating article comprising a modified cellulose. 12. An aerosol-generating article according to any preceding claim, wherein the wrapper is free of metal. 13. An aerosol-generating article according to any preceding claim, wherein the rod of the aerosol-generating substrate has a length of less than about 40 mm. 14. The method of any one of claims 1 to 13, wherein the rod of the aerosol-generating substrate comprises a gathered sheet of homogenised tobacco material or a gel composition, the gel composition comprising at least one gelling agent, an alkaloid compound and a cannabinoid An aerosol-generating article comprising at least one of the compounds and an aerosol former. 15. An aerosol-generating article according to any preceding claim, wherein the rod of the aerosol-generating substrate further comprises a susceptor element arranged within the aerosol-generating substrate. A method of making an aerosol-generating article for generating an inhalable aerosol upon heating, the method comprising:
providing a continuous rod of an aerosol-generating substrate, wherein the aerosol-former content of the aerosol-generating substrate is at least 10% by dry weight;
surrounding the continuous rod of the aerosol-generating substrate with a wrapper, the wrapper comprising a wrapping base material having a dry basis weight;
treating at least a portion of the wrapper with a flame retardant composition comprising one or more flame retardant compounds, such that the treated portion of the wrapper has a total dry basis weight greater than the dry basis weight of the wrapping base material; and
cutting the treated wrapped continuous rod of the aerosol-generating substrate into individual rods, wherein the treated portion of the wrapper in each individual rod comprises at least about 2 grams of one or more flame retardant compounds per square meter of surface area of the treated portion. , each individual rod extending from a respective rod proximal end to a respective rod distal end upstream of the respective rod proximal end. 17. The method of claim 16, wherein the layer of flame retardant composition is applied on at least one side of the wrapping base material by an application process based on size pressing, spraying, printing or coating. 16. An aerosol-generating system comprising an electrically operated aerosol-generating device and an aerosol-generating article according to any one of claims 1 to 15, wherein the aerosol-generating device heats the aerosol-generating device to a temperature sufficient to generate an aerosol from the aerosol-generating substrate. An aerosol-generating system comprising means for heating a rod of an aerosol-generating substrate.

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