JP6808732B2 - Aerosol generating article with ventilation area - Google Patents

Description

The present invention relates to electrically heated aerosol-generating articles, such as heated smoking articles. In particular, embodiments of the present invention include a flammable heat source, an aerosol-forming substrate downstream of the flammable heat source, and a wrapper that surrounds at least the rear portion of the flammable heat source and at least the front portion of the aerosol-forming substrate. Regarding aerosol-generating articles.

Many smoking articles that are heated rather than burned have been advocated in the art. One purpose of such "heated" smoking articles is to reduce known harmful smoke components of the type produced by tobacco burning and pyrolysis in conventional cigarettes. In one known type of heated smoking article, an aerosol is produced by the transfer of heat from a flammable heat source to a physically distant aerosol-forming substrate located downstream of the flammable heat source. During smoking, volatile compounds are released from the aerosol-forming substrate by heat transfer from a flammable heat source and mixed into the air drawn through the smoking article. As the released compounds cool, they condense to form an aerosol that is inhaled by the user.

Heat around at least the rear part of the flammable heat source of the heated smoking article and at least the front part of the aerosol-forming substrate to ensure conductive heat transfer from the flammable heat source to the aerosol-forming substrate to obtain the aerosol. It is well known to include conductive elements. For example, in WO-A2-2009 / 0222232, there is a flammable heat source, an aerosol-forming substrate downstream of the flammable heat source, and around the rear portion of the flammable heat source and the adjacent anterior portion of the aerosol-forming substrate. Disclosure of smoking articles with direct contact thermal conductivity elements. The thermal conductivity element and aerosol-forming substrate are surrounded by an outer wrapper on the cigarette paper. During use, the anterior portion of the aerosol-forming substrate is conducted and heated through the posterior portion of an adjacent flammable heat source and a thermal conductive element.

In smoking articles where tobacco is heated rather than burned, the temperature achieved at the aerosol-forming substrate has a significant effect on the ability to produce a perceptually acceptable aerosol. It is typically desirable to maintain the temperature of the aerosol-forming substrate within a certain range in order to optimize the aerosol delivery to the user. In a smoking article comprising a flammable heat source and an aerosol-forming substrate located downstream of the flammable heat source, the aerosol-forming substrate moves due to the flammable heat source moving relative to the aerosol-forming substrate during use of the smoking article. The temperature of the smoking material drops outside the desired range, which may affect the performance of the smoking article. For example, if the temperature of the aerosol-forming substrate drops too low, it can adversely affect the consistency and quantity of aerosol delivered to the user.

Numerous methods have been proposed to keep a flammable heat source in place within a heated smoking article. For example, it is known to add a layer of adhesive around the flammable heat source between the flammable heat source and the wrapper. However, if the adhesive burns during use, the flammable heat source can only be held in place by the wrapper. As a result, if the holding force provided by the wrapper is not sufficient, the flammable heat source may move to the aerosol-forming substrate.

It has also been proposed to wrap the wrapper tightly around the flammable heat source, or to extend the wrapper around the entire length of the flammable heat source. However, in both cases, the wrapper can adversely affect the combustion of the heat source by limiting the supply of air, thereby reducing the temperature of the aerosol-forming substrate and delivering the aerosol to the user. May have a negative impact on the consistency and quantity of. In addition, the pressure created by the combustion gases produced by the flammable heat source can increase behind the tightly wrapped wrapper. This can create an air gap between the flammable heat source and the wrapper, thereby reducing the retention provided by the wrapper during use and possibly the flammable heat source to the aerosol-forming substrate. Bring movement. If the wrapper contains a thermoconductive element, the air gap between the flammable heat source and the wrapper can adversely affect the conductive heat transfer from the flammable heat source by the thermoconductive element to the aerosol forming substrate. As a result, it may adversely affect the performance of smoking items. In some cases, the pressure generated by the combustion gas behind the tightly wrapped wrapper may be sufficient to damage the wrapper or flammable heat source.

To provide an aerosol-generating article that does not adversely affect the conductive heat transfer from the flammable heat source to the aerosol-forming substrate, and thus the performance of the smoking article, or reduces the adverse effect, and preferably improves the retention of the flammable heat source. Would be desirable.

According to the first aspect of the present invention, a plurality of flammable heat sources, an aerosol-forming substrate downstream of the flammable heat source, and a wrapper surrounding at least a rear portion of the flammable heat source and at least a front portion of the aerosol-forming substrate are provided. Frail form is provided in the area of the wrapper over the flammable heat source, the wrapper can burst during use with multiple frail forms, forming a ventilation area with multiple openings through the wrapper. Provide possible aerosol-generating articles.

Advantageously, in this configuration, the wrapper allows the flammable heat source to be supplied with sufficient air and at the same time allows the combustion gas produced by the heat source in use to escape through multiple openings. It is firmly applied around the flammable heat source and can be held in the correct position. This ensures that conductive heat is transferred from the heat source to the aerosol-forming substrate, and as a result, the performance of the aerosol-generating article is maintained. It can also eliminate the need for adhesives to be applied around the flammable heat source, thus simplifying manufacturing. In some embodiments, the wrapper is arranged such that the wrapper bursts with the frail formation under pressure generated by, for example, the combustion gas. This advantageously allows the flammable heat source to be ventilated during use without undue load on the user. In addition, by providing a frail formation in which the wrapper is rupturable and forms multiple openings, the wrapper limits the amount of moisture absorbed from the atmosphere by the heat source, for example during transportation and storage. In addition, it forms a barrier before it bursts. Since moisture can interfere with the heating performance of the heat source, limiting the amount of moisture absorbed by the heat source can have a favorable effect on the performance of the aerosol-generating article.

As used herein, the term "weak formation" refers to the structure of a wrapper configured to facilitate rupture or breakage of the wrapper in place and to form an opening in a given shape and size. Refers to weakness. Structural weaknesses include, for example, the removal or destruction of a portion of the material in that part, eg, through laser ablation or other methods, or by mechanical pressing or rolling without removing the material. It may be formed through. The term "weak formation" includes a frail line along which the wrapper material is weakened and a frail region in which the wrapper material is removed.

The terms "upstream" and "forward", as well as "downstream" and "rear", as used herein, relate to the direction in which air flows through the aerosol-generating article when used. Used to describe the relative position of a component or part of a component of. The aerosol-generating article according to the invention comprises a proximal end through which the aerosol exits the aerosol-generating article for delivery to the user in use. The proximal end of the aerosol-generating article is sometimes referred to as the oral or downstream end. During use, the user sucks on the oral edge of the aerosol-generating article. The oral end is downstream of the distal end. The flammable heat source is located at or near the distal end. The distal end of the aerosol-generating article is sometimes referred to as the upstream end. A component or part of a component of a smoking article may be described as being upstream or downstream of each other based on their relative position between the proximal end of the smoking article and the distal end of the smoking article. .. The front or part of a component of an aerosol-generating article is the portion of the end closest to the upstream end of the aerosol-generating article. Behind or part of a component of an aerosol-generating article is the portion of the end closest to the downstream end of the aerosol-generating article. The rear part of the flammable heat source is a part of the flammable heat source at the downstream end of the flammable heat source. The front portion of the aerosol-forming substrate is a portion of the aerosol-forming substrate at the upstream end of the aerosol-forming substrate.

In certain preferred embodiments, at least one of the frail formations is defined by one or more frail lines. Each of the plurality of frail formations may be defined by one or more frail lines. The frailty formation may be defined by a frailty region, such as a wrapper region where the thickness is locally reduced. At least one of the frailty formations may be defined by a single frailty line extending around or part of the perimeter of the desired opening shape. In these embodiments, the frail lines may have any suitable shape, such as, for example, straight lines, curved lines or uneven lines, closed shapes, or any combination thereof. In some embodiments, at least one of the frail formations may be defined by two or more frail lines. The two or more frail lines may extend around the desired opening shape or a portion thereof. The two or more frail lines may be combined to define the perimeter or part of the perimeter of the desired opening shape. At least one of the frail formations may be defined by a plurality of frail lines diverging from a weak central region.

If at least one of the frail formations is defined by two or more frail lines, the two or more frail lines may have substantially the same dimensions. The dimensions of one or more of the two or more frail lines may be different.

If at least one of the frailty forms is defined by one or more frail lines, it is preferable that the one or more frail lines do not penetrate the thickness of the wrapper. With such a configuration, the wrapper may form a barrier prior to rupture, even in the area defined by the frail formation.

As used herein, the term "weak line" refers to a line within the wrapper along which the wrapper material is weakened to facilitate rupture or breakage of the wrapper along the desired line. ..

In certain preferred embodiments, at least one of the frail formations is defined by two or more intersecting frail lines. This may allow a sufficiently large opening to be defined by a weak line prior to use of the aerosol-generating article without significantly affecting the strength of the wrapper. The frailty formations may each be defined by two or more intersecting straight lines. In these embodiments, the frail lines may have any suitable shape, such as, for example, straight lines, curved lines or uneven lines, closed shapes, or any combination thereof. Two or more intersecting straight lines may intersect each other at any suitable position along their respective lengths. This is due to the desired shape of the openings formed by the rupture of the wrapper in the frail formation. The two or more intersecting weak lines are preferably arranged such that the resulting weak formation has an open shape. That is, two or more intersecting straight lines are not combined so as to completely surround any part of the wrapper. This configuration allows the ruptured portion of the wrapper to remain bound to the aerosol-generating article after multiple openings have been formed. As a result, it is possible to avoid the generation of debris.

The frailty formations may be produced by a local reduction in the thickness of the wrapper. In these embodiments, the local reduction in thickness may be achieved through material removal, such as by laser ablation. The local reduction in thickness may be achieved through mechanical deformation of the wrapper, such as by rolling or scratching.

The frail formation may be defined by multiple perforations.

The frail product may have any suitable size.

In certain embodiments, the circumferential dimension of one or more frail forms is at least about 0.5 mm, preferably about 0.5 mm to about 2.6 mm, and about 0.8 mm to about 1. It is more preferably 8 mm. The circumferential size of each frail product is preferably at least about 0.5 mm, preferably about 0.5 mm to about 2.6 mm, more preferably about 0.8 mm to about 1.8 mm. preferable.

In certain embodiments, the length of one or more of the frail formations is at least about 0.1 mm, preferably about 0.1 mm to 2.1 mm, preferably from about 0.2 mm to about 1.8 mm. May be more preferable. The length of each frail product is preferably at least about 0.1 mm, preferably about 0.1 mm to about 2.1 mm, more preferably about 0.2 mm to about 1.8 mm. ..

The length of each frail product is preferably shorter than its circumferential dimension. This can help improve the resistance of the wrapper to rupture due to the circumferential tension of the wrapper compared to frail formations that are longer than its circumferential dimension.

The frail product may be separated in the circumferential direction by any suitable circumferential separation. In certain embodiments, adjacent frail formations are circumferentially separated by at least about 0.5 mm, preferably about 0.5 mm to about 2.5 mm, more preferably about 0.7 mm to about 1.5 mm. Separated in the direction.

The frail product may be separated longitudinally by any suitable anteroposterior separation. In certain embodiments, adjacent frail formations are at least about 0.4 mm, preferably about 0.4 mm to 1.8 mm, more preferably about 0.5 mm to about 1.3 mm longitudinally with anteroposterior separation. Separated in the direction.

As used herein, the terms "circumferential separation" and "anterior-posterior separation" are used to mean the minimum distance between two adjacent frail forms in the circumferential and longitudinal directions, respectively. ..

The plurality of frail formations may be arranged in an irregular manner. In certain preferred embodiments, the frailty formations are provided in a regular pattern. With this configuration, if the wrapper bursts along a plurality of frail formations, the resulting plurality of openings will be arranged in a regular pattern. This is advantageous as it can provide ventilation for a homogeneous flammable heat source. Ventilation of a homogeneous flammable heat source can prevent a sudden local increase in gas pressure. In addition, a sudden local increase in heat source temperature can be prevented.

The term "regular pattern" as used herein is used to mean a pattern with a consistently spaced array of frail formations. For example, frail formations are regular stripes, regular grids or squares, regular bricks, regular dots or mottles, regular honeycombs or turtle shells or any other. It may be provided on the wrapper with regular alphanumeric characters, pictograms or geometric shapes.

In certain preferred embodiments, the frail formations are configured such that the total area of the openings is at least about 0.09mm2, such that it is about 0.09mm2 to about 40mm2. It is preferably configured to be about 0.4 mm2 to about 30 mm2. It has been found that such a configuration provides sufficient ventilation to the flammable heat source without significantly affecting the strength of the wrapper.

In certain embodiments, the frail product may be configured such that the plurality of openings form visible markings on the outer surface of the wrapper. As used herein, the term "visible sign" refers to an individual visual element, or an iterative element or pattern that provides an aesthetically pleasing or informative expression. Signs can be in the form of text, images, letters, phrases, logos, patterns or combinations thereof. The sign may include a brand or manufacturer logo that allows consumers to identify the type and source of the aerosol-producing article. The sign can, for example, provide the user with information informing the user that the aerosol-generating article is ready to be used. Light emission from a flammable heat source in use can be seen through multiple openings. As a result, the visualization of the mark can be enhanced.

The wrapper may contain any suitable material. In certain embodiments, the wrapper may include a thermoconducting material. The wrapper may be made of a thermoconducting material. In such embodiments, the wrapper may form a thermoconducting element that extends between the flammable heat source and the aerosol-forming substrate. The thermally conductive element improves the conductive heat transfer from the flammable heat source to the aerosol-forming substrate.

As used herein, the term "thermally conductive material" refers to bulk thermal conductivity of at least about 10 W / m kelvin (W / (mK)) at 23 ° C., and an improved unsteady planar heat source. Used to describe materials with a relative humidity of 50% measured using the MTPS) method. In a preferred embodiment, the wrapper is from a thermoconductive material having a bulk thermal conductivity of at least about 50 W / m Kelvin, more preferably at least about 100 W / m Kelvin, most preferably at least about 150 W / Kelvin m. It is formed.

The wrapper may limit the air before the frail formation bursts. In other words, the wrapper may block or resist the passage of air through the wrapper prior to use.

In certain preferred embodiments, the wrapper is substantially impermeable. That is, the wrapper is made of one or more materials that are substantially impermeable. With such a configuration, the wrapper forms a substantially sealed barrier around the flammable heat source. This makes it possible to substantially prevent the flammable heat source from absorbing moisture from the atmosphere through the wrapper.

The wrapper surrounds at least the rear part of the flammable heat source. The wrapper preferably surrounds the flammable heat source along at least about 50% of the length of the flammable heat source. For example, the wrapper is at least about 60% of the length of the flammable heat source, at least about 70% of the length of the flammable heat source, at least about 80% of the length of the flammable heat source, or at least about 80% of the length of the flammable heat source. A flammable heat source may be surrounded along about 90%. By extending along a longer range of flammable heat source length, the wrapper can mechanically protect the flammable heat source and hold the flammable heat source in place with respect to the aerosol-forming substrate. Can be done. Due to the presence of frail forms that allow the wrapper to rupture during use and form a ventilation area with multiple openings through the wrapper, the wrapper does not adversely affect the performance of the aerosol generating article. It can extend further along the length of the flammable heat source than is possible by other methods.

If the wrapper surrounds the flammable heat source along at least about 50% of the length of the flammable heat source, the ventilation area may extend along a length less than 50% of the length of the flammable heat source. .. In a preferred embodiment where the wrapper surrounds the flammable heat source along at least about 50% of the length of the flammable heat source, the ventilation area is also frail so that it extends along at least about 50% of the length of the flammable heat source. The formation is provided on the wrapper.

In any of the above embodiments, the frail formation may be provided on the wrapper such that the ventilation area extends along approximately the entire length of the area of the wrapper covering the flammable heat source.

The wrapper may indirectly contact the outer surface of the flammable heat source via one or more intermediate components. The wrapper may be in direct contact with the outer surface of the flammable heat source. The wrapper may be in direct contact with the outer surface of the flammable heat source along approximately the entire length of the area of the wrapper covering the flammable heat source.

As used herein, the terms "longitudinal" and "axial" are used to describe the direction between the opposite upstream and downstream ends of an aerosol-generating article or a component of an aerosol-generating article. Will be done.

As used herein, the term "length" is used to describe the maximum longitudinal dimensions of an aerosol-generating article component, such as a flammable heat source, or the aerosol-generating article itself. .. That is, the maximum dimension in the direction between the opposite upstream and downstream ends of the component or the aerosol-generating article itself.

As used herein, the terms "radial" and "transverse" are used to describe directions perpendicular to longitudinal. That is, the direction is perpendicular to the direction of the components of the aerosol-generating article, such as a flammable heat source, or between the opposite upstream and downstream ends of the aerosol-generating article itself.

As used herein, the terms "inner surface" and "outer surface" mean the radial inner surface and the radial outer surface of the components of an aerosol-generating article, respectively.

As used herein, the term "diameter" refers to the maximum transverse dimension of an aerosol-generating article component, such as a flammable heat source, or the aerosol-generating article itself.

The aerosol-generating article according to the present invention comprises a flammable heat source that heats the aerosol-forming substrate. The flammable heat source is preferably a solid heat source and includes, but is limited to, carbon-based materials including carbon, aluminum, magnesium, one or more carbides, one or more nitrides and combinations thereof. It may be equipped with any suitable flammable fuel that is not. Solid flammable heat sources for heated smoking articles, and methods for producing such heat sources, are known in the art, such as US-A-5,040,552 and US-A-5. , 595,577. Typically, known solid flammable heat sources for heated smoking articles are carbon-based, i.e. include carbon as the primary flammable material.

The flammable heat source may be a flammable carbonaceous heat source.

The flammable heat source is preferably a blind flammable heat source.

As used herein, the term "blind" describes a heat source that does not include any airflow channel that extends from the front end face to the rear end face of a flammable heat source. As used herein, the term "blind" is also used to describe a flammable heat source that includes one or more air flow channels that extend from the front end face of the flammable heat source to the rear end face of the flammable heat source. Used, in which case a flammable, substantially impermeable barrier between the rear end face of the flammable heat source and the aerosol-forming substrate barrier allows air to flow one or more along the length of the flammable heat source. Prevents being drawn through the channel.

Encapsulation of one or more closed air passages can increase the surface area of the blind flammable heat source exposed to oxygen from the air, which can advantageously facilitate the ignition and duration of combustion of the blind flammable heat source.

An aerosol-generating article according to the invention, including a blind flammable heat source, is one or more air downstream of the trailing end face of the flammable heat source for drawing air through the aerosol-generating article into one or more airflow paths. Equipped with a suction port. An aerosol-generating article according to the invention comprising a non-blind flammable heat source is one or more air downstream of the trailing end face of the flammable heat source for drawing air through the aerosol-generating article into one or more airflow paths. A suction port may also be provided.

In some embodiments, the aerosol-generating article according to the invention, including a blind flammable heat source, comprises one or more air inlets located near the downstream end of the aerosol-forming substrate.

In use, air drawn along one or more airflow paths of an aerosol-generating article according to the invention, including a blind flammable heat source, does not pass through any airflow channel along the blind flammable heat source. The lack of any airflow channel through the blind flammable heat source advantageously substantially blocks or suppresses the activation of combustion of the blind flammable heat source while the user smokes. This substantially prevents or suppresses spikes in the temperature of the aerosol-forming substrate while the user smokes. By blocking or suppressing the activation of combustion of blind flammable heat sources, and thus blocking or suppressing excessive temperature rise in the aerosol-forming substrate, the combustion of the aerosol-forming substrate or in a violent tobacco situation Pyrolysis can be advantageously avoided. In addition, the impact of the user's smoking situation on the composition of the mainstream aerosol can be advantageously minimized or reduced.

Also, the inclusion of a blind flammable heat source allows the combustion and decomposition products and other materials formed during the ignition and combustion of the blind flammable heat source to be sucked through the aerosol-generating article according to the invention during its use. It can advantageously effectively prevent or prevent entry into the air. This is especially useful if the blind flammable heat source contains one or more additives to assist in igniting or burning the blind flammable heat source.

In an aerosol-generating article according to the invention that includes a blind flammable heat source, heat transfer from the blind flammable heat source to the aerosol-forming substrate is primarily caused by conduction. Heating of the aerosol-forming substrate by forced convection is minimized or reduced. Heating of the aerosol-forming substrate by forced convection is minimized or reduced. This can be beneficial in minimizing or reducing the effect of the user's smoking situation on the composition of the mainstream aerosol of the article according to the invention.

It is particularly important to optimize the conductive heat transfer between the flammable heat source and the aerosol-forming substrate in the aerosol-generating articles according to the invention, including blind flammable heat sources. As further described below, if any heating of the aerosol-forming substrate by forced convection is slight, in aerosol-generating articles including blind heat sources according to the invention, at least the posterior portion of the flammable carbonaceous heat source and It is particularly preferred to include one or more thermally conductive elements around at least the anterior portion of the aerosol-forming substrate.

In certain embodiments of the invention, the flammable heat source comprises at least one longitudinal airflow channel that provides one or more airflow paths through the heat source. The term "airflow channel" is used herein to describe a channel that extends along the length of a heat source through which air can be drawn through an aerosol-generating article. Such a heat source, including one or more longitudinal airflow channels, is referred to herein as a "non-blind" heat source.

The diameter of at least one longitudinal airflow channel may be between about 1.5 mm and about 3 mm, more preferably about 2 mm to about 2.5 mm. As described in more detail by WO-A-2009 / 0222232, the inner surface of at least one longitudinal airflow channel may be partially or completely coated.

As used herein, the term "aerosol-forming substrate" is used to describe a substrate capable of releasing volatile compounds capable of forming aerosols upon heating. The aerosol produced from the aerosol-forming substrate of the aerosol-generating article according to the present invention may or may not be visible, and vapors (eg, fine powders of vapor-like substances are usually liquids or solids at room temperature. ), As well as liquid droplets of gas and condensed vapors.

The aerosol-forming substrate may be a solid aerosol-forming substrate. Alternatively, the aerosol-forming substrate may comprise both solid and liquid components. Aerosol-forming substrates may include tobacco-containing materials, including volatile tobacco-flavored compounds released from the substrate upon heating. Alternatively, the aerosol-forming substrate may include a non-tobacco material. The aerosol-forming substrate may further comprise one or more aerosol-forming bodies. Examples of suitable aerosol-forming bodies include, but are not limited to, glycerin and propylene glycol.

The aerosol-forming substrate may be a rod containing a tobacco-containing material.

When the aerosol-forming substrate is a solid aerosol-forming substrate, the solid aerosol-forming substrate is among herb leaves, tobacco leaves, tobacco stem fragments, reconstituted tobacco, homogenized tobacco, extruded tobacco and swollen tobacco. It may contain one or more, eg, one or more of powders, granules, pellets, fragments, spaghetti-like strands, strips or sheets. The solid aerosol-forming substrate may be in a non-container form or may be provided in a suitable container or cartridge. For example, the aerosol-forming material of a solid aerosol-forming substrate can be contained within paper or other wrapper and have the form of a plug. When the aerosol-forming substrate is in the form of a plug, the entire plug, including any wrapper, is considered to be the aerosol-forming substrate.

Optionally, the solid aerosol-forming substrate may comprise additional tobacco or non-tobacco volatile flavor compounds released upon heating of the solid aerosol-forming substrate. Solid aerosol-forming substrates can also include, for example, capsules containing additional tobacco or non-tobacco volatile flavor compounds, such capsules that dissolve during heating of the solid aerosol-forming substrate.

Optionally, the solid aerosol-forming substrate may be provided or embedded on a thermally stable carrier. The carrier may be in the form of powder, granules, pellets, fragments, spaghetti-like twine, strips or sheets. The solid aerosol-forming substrate may be deposited on the surface of the carrier, for example, in the form of sheets, bubbles, gels or slurries. The solid aerosol-forming substrate may be deposited on the entire surface of the carrier, or otherwise in a certain pattern to provide non-uniform flavor delivery during use.

Aerosol-forming substrates can be in the form of plugs or segments containing materials that can emit volatile compounds in response to heating surrounded by paper or other wrappers. When the aerosol-forming substrate is in the form of such a plug or segment, the entire plug or segment, including any wrapper, is considered to be an aerosol-forming substrate.

The length of the aerosol-forming substrate is preferably about 5 mm to about 20 mm. In certain embodiments, the length of the aerosol-forming substrate may be from about 6 mm to about 15 mm, or from about 7 mm to about 12 mm.

The aerosol-forming substrate may include a plug of tobacco-derived material wrapped in a plug wrap. In a preferred embodiment, the aerosol-forming substrate comprises a plug of homogenized tobacco-derived material wrapped in a plug wrap.

In any of the above embodiments, the flammable heat source and aerosol-forming substrate may be in an adjacent coaxial arrangement. As used herein, the terms "adjacent" and "adjacent" are used to describe another component, or a component that is in direct contact with a part of a component, or a part of a component. Will be done. This includes an embodiment in which a flammable heat source comprises a non-flammable barrier in direct contact with the aerosol-forming substrate between its rear surface and the aerosol-forming substrate.

Aerosol-generating articles according to the invention may include thermally conductive elements that are around and in direct contact with both at least the rear portion of the flammable heat source and at least the front portion of the aerosol-forming substrate. In such an embodiment, the thermally conductive element provides a thermal link between the flammable heat source of the aerosol-generating article according to the invention and the aerosol-forming substrate to advantageously provide an acceptable aerosol. Helps facilitate proper heat transfer from the flammable heat source to the aerosol-forming substrate.

The aerosol-generating article according to the present invention has a gap from one or both of the flammable heat source and the aerosol-forming substrate so that there is no direct contact between the thermally conductive element and one or both of the flammable heat source and the aerosol-forming substrate. It may have a heat conductive element through it.

If the aerosol-generating article contains a thermal conductivity element around at least the posterior portion of the flammable heat source and at least the anterior portion of the aerosol-forming substrate, the thermal conductivity element can be formed with a wrapper. For example, the wrapper may include one or more layers of thermally conductive material formed of one or more thermally conductive elements.

The thermally conductive element is preferably nonflammable. In certain embodiments, the thermal conductivity element can be oxygen limiting. In other words, one or more thermal conductive elements may suppress or resist the passage of oxygen through the thermal conductive elements.

Suitable heat conductive sheet materials include, but are not limited to, metal foil wrappers (eg, aluminum foil wrappers, steel wrappers, iron foil wrappers, and copper foil wrappers), and metal alloy foil wrappers.

The aerosol-generating article according to the present invention may further include a moving element or a spacer element downstream of the aerosol-forming substrate. These elements can take the form of hollow tubes located downstream of the aerosol-forming substrate.

The moving element may be adjacent to one or both of the aerosol-forming substrate and the mouthpiece. Alternatively, the moving element may be via a gap from one or both of the aerosol-forming substrate and the mouthpiece.

Encapsulation of the moving element allows for cooling of the aerosol produced by heat transfer from the flammable heat source to the aerosol forming substrate. The inclusion of moving elements also makes it possible to advantageously adjust the overall length of the aerosol-generating article to a desired value, eg, a length similar to that of conventional cigarettes, by proper selection of the length of the moving element. ..

The length of the moving element may be from about 7 mm to about 50 mm, for example about 10 mm to about 45 mm, or from about 15 mm to about 30 mm. The length of the moving element may be any other length, depending on the desired overall length of the aerosol-generating article and the presence and length of other components within the aerosol-generating article.

The moving element preferably comprises at least one open-ended tubular hollow body. In such an embodiment, in use, the air drawn into the aerosol-generating article is at least one when it passes downstream through the aerosol-generating article from the aerosol-forming substrate to the distal end of the aerosol-generating article. It passes through a tubular aerosol with one end open.

The moving element is formed from at least one open-ended material that is substantially thermally stable at the temperature of the aerosol produced by the transfer of heat from the flammable heat source to the aerosol-forming substrate. It may include a tubular aerosol. Suitable materials are known in the art and include, but are not limited to, paper, cardboard, plastics, such cellulose acetate, ceramics and combinations thereof.

The aerosol-generating article according to the present invention may include an aerosol cooling element or heat exchanger downstream of the aerosol-forming substrate. The aerosol cooling element may include a plurality of longitudinally extending channels. If the aerosol-generating article comprises a moving element downstream of the aerosol-forming substrate, the aerosol cooling element is preferably downstream of the moving element.

Aerosol cooling elements may include aggregates of material sheets selected from the group consisting of metal foil, polymeric materials and substantially non-porous paper or cardboard. In certain embodiments, the aerosol cooling element consists of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA) and aluminum foil. It may include an aggregate of material sheets selected from the group.

In certain preferred embodiments, the aerosol cooling element is an assembly of sheets of biodegradable polymeric material such as polylactic acid (PLA) or Meter-Bi® grade (a commercially available family of starch-based copolyesters). It may include the body.

The aerosol-generating article preferably includes a mouthpiece located downstream of the aerosol-forming substrate and at the downstream end of the aerosol-generating article. The mouthpiece may include a filter. For example, a mouthpiece may include a filter plug with one or more segments. If the mouthpiece comprises a filter plug, the filter plug is preferably a single segment filter plug. The filter plug may include one or more segments containing cellulose acetate, paper, or other suitable known filtration material, or a combination thereof. The filter plug preferably contains a filtration material having low filtration efficiency.

The aerosol-generating article according to the present invention may comprise a plurality of elements assembled in the form of rods.

The term "aerosol-generating article" as used herein is used to mean an article comprising an aerosol-forming substrate capable of releasing volatile compounds capable of forming an aerosol. The aerosol-generating article may be a non-flammable aerosol-generating article, which is an article that releases a volatile compound without using combustion of an aerosol-forming substrate. The aerosol-generating article can be a heated aerosol-generating article, which is an aerosol-generating article containing an aerosol-forming substrate intended to be heated rather than burned to release a volatile compound capable of forming an aerosol. The heated aerosol generator may be provided with on-board heating means to form a component of the aerosol generator or is configured to interact with an external heater forming a separate aerosol generator component. May be good.

Aerosol-generating articles can be smoking articles. The aerosol-generating article may be a smoking article that produces an aerosol that can be inhaled directly into the user's lungs through the user's mouth. Aerosol-generating articles may resemble conventional smoking articles such as cigarettes. Aerosol-producing articles may include tobacco. Aerosol-generating articles may be disposable. Aerosol-generating articles may include partially reusable, refillable or replaceable aerosol-forming substrates.

The aerosol-generating article may be substantially cylindrical in shape. The aerosol-generating article may be substantially elongated. The aerosol-forming substrate may have a substantially cylindrical shape. The aerosol-forming substrate may be substantially elongated. The aerosol-forming substrate can be located within the aerosol-generating article such that the length of the aerosol-forming substrate is substantially parallel to the direction of the airflow within the aerosol-generating article.

The moving section or element may be substantially elongated.

The aerosol-generating article can have any desired length. For example, the total length of the aerosol-generating article can be from about 65 mm to about 100 mm. Aerosol-generating articles can have any desired outer diameter. For example, the outer diameter of the aerosol-generating article can be from about 5 mm to about 12 mm.

Aerosol-generating articles can be surrounded, for example, by an outer wrapper on cigarette paper with low air permeability. Alternatively or additionally, the mouthpiece may be surrounded by chipping paper.

Of course, certain combinations of various features described and defined in any aspect of the invention can also be independently implemented and / or supplied and / or used.
The present invention will be further described, but only as an example, with reference to the accompanying drawings.

FIG. 1 shows a schematic longitudinal sectional view of a first embodiment of a smoking article according to the present invention. FIG. 2A shows a schematic side perspective view of the multi-segment component of the smoking article of FIG. 1 having a wrapper with the plurality of frail formations according to the first embodiment. FIG. 2B shows a schematic side perspective view of the multi-segment component of the smoking article of FIG. 1 having a wrapper with the plurality of frail formations according to the first embodiment. FIG. 2C shows an enlarged view of the wrapper for the multi-segment components of FIGS. 2A and 2B. FIG. 3 shows a schematic side perspective view of the smoking article of FIG. 1 in which the cap is removed and the wrapper ruptures to form a ventilation area. FIG. 4A shows an enlarged view of the wrapper for the smoking article of FIG. 1 having the plurality of frail formations according to the second embodiment. FIG. 4B shows an enlarged view of the wrapper of FIG. 4A where the wrapper bursts with a frail formation to form a ventilation area.

The smoking article 100 according to the first embodiment of the present invention shown in FIG. 1 has a flammable carbonaceous heat source 102, an aerosol forming base 104, a moving element 106, an aerosol cooling element 108, and a spacer element 110, which are adjacent to each other in a coaxial arrangement. And a mouthpiece 112. The flammable carbonaceous heat source 102 has a front end face 114 and an opposite rear end face 116. As shown in FIG. 1, the flammable heat source 102, the aerosol forming substrate 104, the moving element 106, the aerosol cooling element 108, the spacer element 110, and the mouthpiece 112 are the outer wrapper 118 of a sheet material such as cigarette paper. Wrapped in.

The flammable heat source 102 is a blind carbonaceous flammable heat source and is located at the distal end of the smoking article 100. As shown in FIG. 1, a nonflammable, substantially impermeable barrier 120 in the form of an aluminum foil disc is provided between the rear end face 116 of the flammable carbonaceous heat source 102 and the aerosol forming substrate 104. Will be done. The barrier 120 is applied by pressure molding an aluminum foil disc onto the rear end surface 116 of the flammable heat source 102 and is applied to the rear end surface 116 of the flammable heat source 102. The barrier 120 is adjacent to the trailing end face 116 of the flammable carbonaceous heat source 102 and the aerosol-forming substrate 104.

The aerosol-forming substrate 104 is located just downstream of the barrier 120 applied to the trailing end face 116 of the flammable carbonaceous heat source 102. As shown in FIG. 1, the flammable heat source 102 and the aerosol-forming substrate 104 may be adjacent to each other in a coaxial arrangement. The aerosol-forming substrate 104 comprises a columnar plug of a homogenized tobacco-derived material 122 wrapped in a plug wrap 124, including, for example, an aerosol-forming body such as glycerin.

The moving element 106 is located just downstream of the aerosol-forming substrate 104 and includes a hollow, open-ended, cylindrical cellulose acetate tube 128.

The aerosol cooling element 108 is located immediately downstream of the moving element 106 and comprises an assembly of sheets of a biodegradable polymeric material such as polylactic acid.

The spacer element 110 is located just downstream of the aerosol cooling element 108 and includes a hollow paper or cardboard tube with a columnar open end.

The mouthpiece 112 is located just downstream of the spacer element 110. As shown in FIG. 1, the mouthpiece 112 is located at the proximal end of the smoking article 100 and is wrapped in a filter plug wrap 132 for a suitable filtration material such as cellulose acetate tow, which has very low filtration efficiency. A columnar plug 130 is provided. The smoking article 100 may further include a band of chipping paper (not shown) surrounding the downstream end portion of the outer wrapper 118.

As shown in FIG. 1, the smoking article 100 includes a wrapper 126 that surrounds at least the rear portion of the flammable heat source 102 and at least the front portion of the aerosol forming substrate 104. The wrapper 126 tightly wraps around the flammable heat source 102 and the aerosol-forming substrate 104 to maintain the correct position of the flammable heat source 102 with respect to the aerosol-forming substrate. In this embodiment, the wrapper 126 is formed of a thermoconducting material, such as aluminum foil, whereby the wrapper forms a thermoconducting element. In this way, the wrapper 126 forms a thermal bridge between the flammable heat source 102 and the aerosol-forming substrate to ensure sufficient conductive heat transfer from the flammable heat source 102 to the aerosol-forming substrate 104. Wrapper 126 is substantially impermeable. As a result, the wrapper 126 forms a barrier before it bursts, for example, to limit the amount of moisture absorbed from the atmosphere by the flammable heat source 102 during transport and storage. Since moisture can interfere with the heating performance of the heat source, limiting the amount of moisture absorbed by the heat source can have a beneficial effect on the performance of the smoking article 100. In some embodiments, the wrapper 126 may be formed of a heat insulating sheet material such as, for example, a low air permeable cigarette paper that wraps around a flammable heat source 102 and an aerosol forming substrate 104.

In this embodiment, the wrapper 126 covers the entire length of the flammable heat source 102, except for the front portion adjacent to the front end surface 114 of the flammable heat source 102 and the overall length of the aerosol forming substrate 104. In other embodiments of the invention (not shown), the aerosol-forming substrate 104 may extend downstream beyond a single thermal conductive element 126. That is, the wrapper 126 may cover only the front portion of the aerosol forming substrate 104. Of course, other embodiments of the invention (not shown) may provide one or more additional thermal conductivity elements that cover the wrapper 126.

In this embodiment, the smoking article 100 may further include a removable cap 134 at its distal end and directly adjacent to the heat source 102. For example, the removable cap may include a central portion with a desiccant such as glycerin to absorb moisture relative to the heat source, and may be wrapped in a portion of the outer wrapper 118 to enclose the smoking article. Connects to the rest of the outer wrapper 118 along a frail line 136 containing a plurality of perforations. To use smoking items, the user removes the cap by sandwiching the removable cap 134 between the thumb and other fingers and compressing it in the transverse direction. By compressing the cap, sufficient force is supplied to the weak line 136 to locally break the outer wrapper 118. The user then removes the cap by twisting the cap to break the rest of the frail line. The front portion of the flammable heat source 102 is exposed when the cap is removed, which allows the user to ignite the smoking article 100.

The smoking article 100 includes one or more air inlets 138 around the periphery of the aerosol forming substrate 104. As shown in FIG. 1, an air suction port 138 arranged in the circumferential direction is provided to the plug wrap 126 of the aerosol forming substrate 104 and the outer wrapper 120 above it to provide cold air (indicated by the dotted arrow in FIG. 1). Is placed in the aerosol-forming substrate 104.

During use, the user removes the cap 134 and ignites a flammable heat source 102 that heats the aerosol-forming substrate 104 to produce an aerosol. When the user sucks with the mouthpiece 110, air (indicated by the dotted arrow in FIG. 1) is drawn into the aerosol forming substrate 104 through the air suction port 138.

The anterior portion of the aerosol-forming substrate 104 is electrically heated through the trailing end surface 116 of the flammable carbonaceous heat source 102, the barrier 120 and the wrapper 126 acting as a thermal conductive element.

Heating of the aerosol-forming substrate 104 by conduction releases glycerin and other volatile and semi-volatile compounds from the plug of the homogenized tobacco-derived material 122. The compound released from the aerosol-forming substrate 104 forms an aerosol and, as it flows through the aerosol-forming substrate 104, mixes into the air drawn into the aerosol-forming substrate 104 of the smoking article 100 through the air inlet 138. Will be done. The drawn air and the introduced aerosol (indicated by the dotted arrow in FIG. 1) are inside the hollow cellulose acetate tube 128, the aerosol cooling element 108, and the spacer element 110 with the cylindrical end of the moving element 106. It passes downstream, where it cools and condenses. The cooled drawn air and the mixed aerosol pass downstream through the mouthpiece 112 and are delivered to the user through the proximal end of the smoking article 100. A nonflammable, substantially impermeable barrier 120 on the trailing end surface 116 of the flammable heat source 102 prevents air drawn through the smoking article 100 from coming into direct contact with the flammable carbonaceous heat source 102 in use. , Isolate the flammable carbonaceous heat source 102 from the air drawn through the smoking article 100.

2A and 2B show schematic side perspective views of the multi-segment component 140 of the smoking article 100 of FIG. The multi-segment component 140 includes the flammable heat source 102 of the smoking article 100 of FIG. 1, the aerosol forming substrate 104 and the wrapper 126. FIG. 2A shows a wrapper 126 surrounding a flammable heat source 102 and an aerosol forming substrate 104. FIG. 2B shows a wrapper 126 that can be partially unraveled to see the flammable heat source 102 and the aerosol-forming substrate 104.

The multi-segment component 140 may be pre-assembled separately from the remaining components of the smoking article to be subsequently assembled, or may be manufactured and assembled with the other components of one or more smoking articles 100. Good.

As shown in FIGS. 2A and 2B, the plurality of frail formations 150 according to the first embodiment are provided in the frail region 160 of the wrapper 126 covering the flammable heat source 102. The wrapper 126 is capable of bursting with the frail product 150 and forms a ventilation region corresponding to the frail region 160. The frail formation 150 is arranged on the wrapper 126 in a regular pattern aligned vertically and horizontally and does not penetrate the thickness of the wrapper.

FIG. 2C shows an enlarged view of the wrapper 126 of the multi-segment component 140. In this embodiment, the frail formations 150 are each defined by a plurality of frail lines 152 extending from the central non-weak region 154. The frail line 152 is oblique to the longitudinal direction of the multi-segment component 140. In this embodiment, each frail formation 150 is shown to include a frail line 152, and four lines are two pairs of collinears that cross each other so that each frail formation 150 is approximately "X" shaped. It is grouped in. Since the lines are of similar length, the frail formation 150 forms a nearly square shaped opening on the rupture.

Each frail formation 150 is shown to be defined by four frail lines 152, but of course one or more of the frail formations may be formed from a number of frail lines up and down from four. Good. For example, one or more of the frail formations extending from the central non-weak region may be formed by three or more frail lines extending from the central non-weak region. In some embodiments, one or more of the frail formations may include two or more intersecting frail lines. In these embodiments, the frail lines may intersect towards either end of one or more of the frail lines. The intersecting frail lines may intersect in the central region of the frail formation. In a further embodiment, the one or more frail formations may be formed by one or more frail lines extending around or along a portion of the desired opening shape.

The frail lines 152 are shown to have similar lengths, but in some embodiments, one or more frail lines may have different lengths.

Adjacent frail formations are separated circumferentially by circumferential separation 156 and longitudinally by anteroposterior separation 157. The circumferential separation 156 is preferably at least about 0.5 mm, preferably about 0.5 mm to about 2.5 mm, and more preferably about 0.7 mm to about 1.5 mm. The anteroposterior separation 157 is preferably at least about 0.4 mm, preferably about 0.4 mm to about 1.8 mm, and more preferably about 0.5 mm to about 1.3 mm.

Each frail formation has a circumferential dimension of 158 and a length of 159. The circumferential dimension 158 is preferably at least about 0.5 mm, preferably about 0.5 mm to about 2.6 mm, and more preferably about 0.8 mm to about 1.8 mm. The length 159 is preferably at least about 0.1 mm, preferably about 0.1 mm to about 2.1 mm, and more preferably about 0.2 mm to 1.8 mm.

The frail product 150 has a sufficient total open area where the resulting multiple openings allow sufficient air supply to the flammable heat source 102 and sufficient ventilation of combustion gas from the flammable heat source 102. Arranged to have. The frail formation 150 is preferably arranged such that the total opening area of the resulting plurality of openings is at least about 0.09 mm2, from about 0.09 mm2 to about 40 mm2. It is preferably arranged to be, more preferably about 0.4 mm2 to about 30 mm2.

During use of the smoking article 100, the pressure exerted on the wrapper 126 by the combustion gas released by the flammable heat source 102 causes the wrapper 126 to burst at the frail formation 150, as discussed below in connection with FIG. A ventilation area is formed that includes a plurality of openings that penetrate the wrapper 126.

FIG. 3 shows a schematic side view of the smoking article 100 in use. As shown, the cap is removed from the upstream end of the smoking article, allowing the user to ignite the flammable heat source 102 at its upstream end. When ignited, the flammable heat source 102 produces heat and a combustion gas that exerts pressure on the wrapper 126. Since each opening 170 corresponds to a frail formation in the wrapper, this causes the wrapper 126 to rupture with the frail formation to form a ventilation region 180 including a plurality of openings 170 penetrating the wrapper 126. ..

Due to the presence of the ventilation region 180, the supply of air to the flammable heat source may be sufficient even if the wrapper 126 tightly wraps around the flammable heat source 102. Regardless of how much the flammable heat source 102 is covered by the wrapper 126, this ensures that there is no significant inconvenience in the amount of heat generated by the flammable heat source 102 during use. The ventilation region 180 also allows the combustion gas produced by the flammable heat source 102 to escape through the plurality of openings 170. This prevents the buildup of excessive pressure behind the wrapper 126 and provides a radial gap formed between the wrapper 126 and the flammable heat source 102 from the amount of flammable heat source 102 covered by the wrapper 126. And can lead to relative movement between the flammable heat source 102 and the aerosol forming substrate 104. In this way, the ventilation region 180 ensures heat generation by the flammable heat source 102 and conductive heat transfer from the heat source 102 to the aerosol forming substrate 104, regardless of how much the flammable heat source 102 is covered by the wrapper 126. As a result, the performance of the smoking article is maintained.

As shown in FIG. 3, the flammable heat source 102 has a diameter of 190 and extends up to a quantity of 192 upstream of the upstream end of the wrapper 126. The wrapper 126 extends upstream of the outer wrapper 118 up to a quantity of 194 and is covered downstream of it by the outer wrapper 118 up to a quantity of 196. An exemplary range of dimensions 190, 192, 194 and 196 is shown in Table 1 below.

図４Ａは、図１の喫煙物品１００の代替のラッパー４２６の拡大図を示し、ラッパー４２６は、第２の実施例による複数の虚弱形成物を有する。図４Ａに示すように、各虚弱形成物４５０は、中央領域４５４で交差する円周方向の虚弱線４５２および長手方向の虚弱線４５３を含む。虚弱形成物４５０は、隣接する列を長手方向にオフセットし、１つおきの列を長手方向に整列させて、均一に列が離間した規則的なパターンで配置される。虚弱形成物のその他のパターンも予想されることが理解されよう。

FIG. 4A shows an enlarged view of an alternative wrapper 426 for the smoking article 100 of FIG. 1, the wrapper 426 having a plurality of frail formations according to the second embodiment. As shown in FIG. 4A, each frail formation 450 includes a circumferential frail line 452 and a longitudinal frail line 453 that intersect at the central region 454. The frail form 450 is arranged in a regular pattern with adjacent rows offset longitudinally and every other row aligned longitudinally with the rows evenly spaced apart. It will be understood that other patterns of frail formations are also expected.

Adjacent frail formations 450 in which every other row is aligned in the longitudinal direction are separated in the circumferential direction by circumferential separation 456. Adjacent frail formations 450 in each row are longitudinally separated by anteroposterior separation 457. The circumferential separation 456 is preferably at least about 0.5 mm, preferably about 0.5 mm to about 2.5 mm, and more preferably about 0.7 mm to about 1.5 mm. The anteroposterior separation 457 is preferably at least about 0.4 mm, preferably about 0.4 mm to about 1.8 mm, and more preferably about 0.5 mm to about 1.3 mm.

Each frail product 450 has a circumferential dimension of 458 and a length of 459. Since the frailty formation 450 is formed by the frail line 452 in the circumferential direction and the frail line 453 in the longitudinal direction, respectively, the circumferential dimension 458 corresponds to the circumferential length of the frail line 452 in the circumferential direction. The longitudinal dimension 459 corresponds to the length of the longitudinal weak line 453. The circumferential dimension 458 is preferably at least about 0.5 mm, preferably about 0.5 mm to about 2.6 mm, and more preferably about 0.8 mm to about 1.8 mm. The length 459 is preferably at least about 0.1 mm, preferably about 0.1 mm to about 2.1 mm, more preferably about 0.2 mm to about 1.8 mm.

FIG. 4B shows an enlarged view of the wrapper 426 of FIG. 4A in which the wrapper 426 bursts with a plurality of frail formations to form a ventilation region 480 including a plurality of openings 470 penetrating the wrapper 426. As shown, due to the construction of the frail formation, the plurality of openings 470 are substantially diamond-shaped, and the portion 472 in which the wrapper ruptured remains attached to the wrapper 426. This avoids the generation of debris from the wrapper 426.

The specific embodiments and examples described above are illustrated, but this is not intended to limit the invention. As a matter of course, other embodiments of the present invention may be prepared, and the specific embodiments and examples described in this document are not exhaustive.

Claims (16)

Aerosol-generating article
With flammable heat source
With the aerosol-forming substrate downstream of the flammable heat source,
Includes at least a rear portion of the flammable heat source and a wrapper surrounding at least the front portion of the aerosol-forming substrate.
A plurality of frail forms are provided over the area of the wrapper over the flammable heat source, the wrapper is capable of bursting with the plurality of frail forms during use, and a plurality of openings penetrating the wrapper. An aerosol-generating article that forms a ventilation area with. The aerosol-generating article of claim 1, wherein at least one of the frailty-forming products is defined by one or more frail lines. The aerosol-generating article of claim 2, wherein at least one of the frailty-forming products is defined by two or more intersecting frail lines. The aerosol-generating article according to any one of claims 1 to 3, wherein the plurality of frail forms are formed from a local decrease in the thickness of the wrapper. The circumferential dimension of each frail form is at least about 0.5 mm, preferably about 0.5 mm to about 2.6 mm, more preferably about 0.8 mm to about 1.8 mm, claim. Item 4. The aerosol-generating article according to any one of Items 1 to 4. Claims that the length of each frail form is at least about 0.1 mm, preferably from about 0.1 mm to about 2.1 mm, more preferably from about 0.2 mm to about 1.8 mm. The aerosol-generating article according to any one of 1 to 5. Adjacent frail formations are preferably separated by at least about 0.5 mm in the circumferential direction by circumferential separation, preferably about 0.5 mm to about 2.5 mm, preferably about 0.7 mm to about 1.5 mm. The aerosol-generating article according to any one of claims 1 to 6, more preferably. Adjacent frail forms are separated in the longitudinal direction by at least about 0.4 mm, preferably about 0.4 mm to 1.8 mm, preferably about 0.5 mm to about 1.3 mm. The aerosol-generating article according to any one of claims 1 to 7, more preferably. The aerosol-generating article according to any one of claims 1 to 8, wherein the plurality of frail forms are provided in a regular pattern. The total area of the plurality of openings is at least about 0.09 mm2, preferably about 0.09 mm2 to about 40 mm2, more preferably about 0.4 square mm to about 30 mm2. The aerosol-generating article according to any one of claims 1 to 9, wherein the plurality of frail formations are arranged so as to be. The aerosol-generating article of any of claims 1-10, wherein the frail form is arranged such that the plurality of openings form a mark on the outer surface of the wrapper. The aerosol-generating article according to any one of claims 1 to 11, wherein the wrapper is made of a heat conductive material. The aerosol-generating article according to any one of claims 1 to 12, wherein the wrapper is substantially impermeable. The aerosol-generating article of any of claims 1-13, wherein the wrapper surrounds the flammable heat source along at least about 50% of the length of the flammable heat source. The aerosol-generating article of claim 14, wherein the frail form is provided on the wrapper such that the ventilation area extends along at least 50% of the length of the flammable heat source. The aerosol-generating article according to any one of claims 1 to 15, wherein the wrapper is in direct contact with the outer surface of the flammable heat source.

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