JP2019505184A - Fragile aerosol generating articles - Google Patents

Abstract

The present invention includes a first section (114) that includes a combustible heat source (102) and an aerosol-forming substrate (104) and a tubular element that defines a recess (152) at one end of a second section (118). 150) and a second section (118) comprising an aerosol generating article (100). The first and second sections (114, 118) are integrally connected at the weak region (122) and are separable at the weak region. This allows the tubular element (150) to have a combustible heat source (102) after use of the aerosol-generating article so that the combustible heat source is received at least partially within the depression (152) to reduce the ignition tendency of the smoking article. ) Can be placed on top. The first section is configured such that when the tubular element is at least partially open at both ends thereof, the first and second sections are connected together and air can be drawn through the tubular element. Upstream of the second section. The tubular element is at the downstream end of the second section so that the recess forms a mouth end recess or at the upstream end so that the recess forms a moving element. [Selection] Figure 1

Description

  The present invention relates to an aerosol generating article, such as a smoking article, having a flammable heat source for heating an aerosol-forming substrate downstream of the flammable heat source.

  Many smoking articles that have been heated rather than burning tobacco have been proposed in the art. One purpose of such “heated” smoking articles is to reduce the known harmful smoke components of the type produced by tobacco burning and pyrolysis in conventional cigarettes. In one known type of heated smoking article, the aerosol is generated by heat transfer to an aerosol-forming substrate (such as tobacco) that is physically separated from a combustible heat source. The aerosol-forming substrate may be located in, around, or downstream of the combustible heat source. For example, WO-A2-2009 / 022232 is in contact with and around a combustible heat source, an aerosol-forming substrate downstream of the combustible heat source and a rear portion of the combustible heat source and an adjacent front portion of the aerosol-forming substrate. A smoking article comprising a thermally conductive element is disclosed. During smoking, volatile compounds are released from the aerosol-forming substrate by heat transfer from a combustible heat source and are entrained in the air drawn through the smoking article. As the released compounds cool, they condense to form an aerosol that is inhaled by the user.

  Smoking articles containing combustible fuel elements or heat sources are larger, more dense, and heat sources compared to conventional cigarettes, where volatile compounds are released from the tobacco when it is burned or heated. It may have a combustion zone or a heating zone that cannot be easily extinguished by crushing or “smearing”. Such smoking articles can have a heat source that contains significantly more energy in the form of heat than that present in the combustion zone of conventional cigarettes. As a result, such smoking articles can require greater effort to extinguish or promote disposal by eliminating sufficient heat.

  It would be desirable to provide an improved aerosol generating article, particularly one that includes a combustible fuel element or heat source. In particular, it would be desirable to provide an aerosol generating article that has elements to facilitate disposal of the aerosol generating article after use and that is simple to manufacture and use.

  In accordance with the present invention, an aerosol generating article comprising a first section having a combustible heat source and an aerosol-forming substrate, and a second section having a tubular element defining a recess at one end of the second section. Wherein the first and second sections are integrally connected in the frail area so that the combustible heat source is received at least partially within the recess after use of the aerosol generating article. And the second section is separable in the weak region, allowing the tubular element to be placed on the flammable heat source, and when the first and second sections are joined together in the weak region, the first section Is upstream of the second section so that air can be drawn along the aerosol generating article through the tubular element during use of the aerosol generating article The tubular element is at least partially open at both ends thereof and is tubular so that when the first and second sections are joined together, the recess forms a recess at the mouth end of the aerosol generating article. The element is at the downstream end of the second section, or the tubular element is at the upstream end of the second section, and when the first and second sections are joined together, the tubular element becomes an aerosol generating article. One of the moving elements.

  Advantageously, the present invention provides an aerosol generating article that is simple to manufacture and use, having an integral means of facilitating disposal. By placing the tubular element on the combustible heat source while the heat source is burning or at an elevated temperature, a barrier is formed between the combustible heat source and the outer surface of the aerosol generating article. Thus, the heat source can be shielded by the tubular element until cooled to a sufficiently low temperature to be easily discarded. In some preferred embodiments, the tubular element prevents the supply of air to the combustible heat source and facilitates extinguishing the combustible heat source when the heat source is received in the recess. This means that the combustion zone or heating zone of an aerosol-generating article with a flammable heat source is large and dense compared to conventional cigarettes and cannot be easily extinguished by crushing or “smearing out” Therefore, it is considered particularly advantageous,

  In addition, the tubular element is formed as an integral part of the aerosol generating article by connecting the first and second sections together and providing such a tubular element as part of the second section. As a result, compared to an aerosol generating article having a separately formed fire extinguisher cap, the likelihood of accidental separation of the tubular element from the rest of the aerosol generating article, for example during transport or storage, is reduced. The It can also be prevented that the tubular element is misplaced or misplaced before use, as can occur with aerosol-generating articles having a separately formed fire-extinguishing cap.

  Connecting the first and second sections in the weak region advantageously allows the user to split the aerosol generating article in two without undue burden by separating the first and second sections. to enable. The tubular element can then be placed on the heat source after use of the aerosol generating article. In addition, by providing the tubular element as an integral part of the aerosol generating article, difficulties arising from size differences due to manufacturing tolerances that can occur when assembling an aerosol generating article with a separately formed fire-extinguishing cap or heat shield element Is reduced.

  The frail area may exist as a result of the first and second sections having an interface in that area. In some examples, the tensile strength of any wrapping, such as a paper layer, at the interface of the weak region is such that the separation occurs in the region of the interface so that separation occurs in the region of the interface. Preferably it is less than the tensile strength of the inner element. The tensile strength of the wrapping is preferably less than 50%, or less than 20% or less than 10% of the inner element. In some examples, a weak region, such as one or more perforations or other formations, is provided in the weak region, for example, to reduce wrapping or other joint tensile strength in the weak region. For example, if metallized wrapping is present at the interface between the first and second sections, the metallized wrapping preferably includes one or more perforations.

  As used herein, the terms “integral” and “integrally” mean that the first section and the second section share at least one component that couples them together. Used for. That is, the first and second sections are joined by components that form part of both the first section and the second section. For example, the first section and the second section are joined together by a wrapper that forms part of both the first and second sections. The term “joined together” does not apply to the individual first and second sections held together by friction or fastening means, such as gluing or screw connections.

  The first section including the heat source and the aerosol-forming substrate is upstream of the second section when the first and second sections are joined together in the weak region. The tubular element is at least partially open at both ends thereof so that air can be drawn through the tubular element along the aerosol generating article during use of the aerosol generating article. In other words, the tubular element defines a portion of the airflow path through the assembled aerosol generating article. In this arrangement, the first and second sections do not need to be separated prior to use and can remain connected together during use. Thus, the user need not hold two separate sections during use of the aerosol generating article, but can separate the sections and immediately place the tubular element on the heat source in one operation. By having a tubular element that defines a portion of the airflow path through the assembled aerosol generating article, the overall length of the aerosol generating article can be set to a desired value, for example, by selecting the length of the tubular element appropriately. It can be easily adjusted to a length similar to the length of a cigarette. Where the first and second sections are surrounded by a wrapper, such as the outer wrapper of an aerosol generating article, the arrangement of the present invention allows the tubular element to be provided entirely within the outer diameter of the wrapper. This means that the outer diameter of the assembled aerosol generating article is substantially unaffected by the presence of the tubular element. This can be beneficial to the ease of use and overall appearance of the assembled aerosol generating article.

  In certain preferred embodiments, the tubular element is a hollow tube open at both ends. In such embodiments, air can be drawn along the aerosol generating article through the tubular element without the tubular element having any significant effect on the drag resistance of the aerosol generating article.

  The drag-out resistance (RTD) of the aerosol generating article is the static pressure difference between the two ends of the specimen when traversed by an air stream under steady conditions with a flow rate of 17.5 ml / sec at the output end. Means. The RTD of the specimen can be measured using the method described in ISO standard 6565: 2002.

  If the first section is upstream of the second section, the second section may form the downstream or mouth end of the aerosol generating article. In such embodiments, the tubular element may be in any suitable location along the second section, provided that the combustible heat source is defined by the tubular element when the first and second sections are separated in the weak region. Subject to being able to be received in the recess.

  In certain embodiments, the tubular element is at the downstream end of the second section and forms a recess at the mouth end of the aerosol generating article when the first and second sections are joined together.

  The tubular element may be at the upstream end of the second section and form a moving element for the aerosol generating article. The tubular element is at the upstream end of the second section and may form a moving element of the aerosol generating article between the aerosol forming substrate and the mouthpiece of the aerosol generating article. The tubular element may be at the upstream end of the second section and form a moving element for the aerosol generating article between the aerosol forming substrate and the mouthpiece of the second section.

  The aerosol generating article may further comprise a removable cap at the distal end of the first section to protect the heat source prior to use of the aerosol generating article.

  As used herein, the term “cap” means a protective cover that substantially surrounds the distal end (including the end face) of the aerosol-generating article. By providing the removable cap as a separate component or with the tubular element, the heat source is not easily ignited by the user until the cap is removed. This is different from a paper wrapper. In the case of a paper wrapper, even if the heat source is covered as it is, ignition of the heat source by the user is not prevented or prevented. Similarly, providing a removable cap that is removed prior to ignition of the heat source can lead to reduced ash generation and flame as compared to an aerosol generating article with a paper wrapper covering the heat source during ignition. If a paper wrapper is present, the paper wrapper can burn rapidly when the aerosol generating article is ignited, leading to the generation of flames and ashes. A removable cap may allow for a more hygienic aerosol generating article to be provided. In addition, the cap reduces the risk of the user coming into direct contact with the heat source, thus reducing the risk that the heat source will contaminate the user's clothes and hands.

  Similarly, by providing a removable cap, the risk that a heat source will contaminate the manufacturing equipment or contaminate adjacent aerosol generating articles during manufacture is advantageously reduced. Indeed, the removable cap serves to separate the heat source from the surrounding equipment and aerosol generating articles. In addition, the removable cap provides physical protection during manufacture and helps prevent damage or chipping of the heat source.

  For example, an aerosol generating article according to the present invention may include a removable cap attached to the distal end of the aerosol generating article on a weak line, the cap being a wrapper as described in WO-A1-2014 / 086998. A cylindrical plug of material surrounded by.

  The aerosol-forming substrate can be downstream of the heat source. The aerosol-forming substrate can be coaxially located in or around the heat source.

  As used herein, the terms “upstream” and “front” and “downstream” and “backward” refer to the segment of an aerosol generating article or the direction in which the user sucks the aerosol generating article during its use. Used to describe the relative position of the components. An aerosol generating article according to the present invention includes a mouth end and an opposite distal end. In use, the user sucks the mouth end of the aerosol generating article. The mouth end is downstream of the distal end. The heat source is located at or near the distal end.

  In any of the above embodiments, the tubular element can be substantially rigid. In such an arrangement, the shape of the indentation can be substantially maintained while placing the tubular element on the combustible heat source. This facilitates acceptance of the flammable heat source into the well after use of the aerosol generating article.

  The tubular element preferably has a wall thickness of about 100 micrometers to 300 micrometers, for example 200 micrometers. The wall thickness described above can provide adequate stability in some instances, such as when the tubular element includes paper or cardboard, for example when a heat source is inserted into the tubular element. The tubular element may include a reinforcing formation, such as a tubular insert.

  When the tubular element is placed on a combustible heat source after use of the aerosol generating article, the combustible heat source is received at least partially within the recess to facilitate disposal of the aerosol generating article. For example, the tubular element leaves at least 90 percent of the length of the combustible heat source when the combustible heat source is received in the recess, for example, leaving an uncovered combustible heat source length of about 1 mm. Arranged to extend. The tubular element is preferably arranged such that the tubular element extends substantially along the entire length of the combustible heat source when the combustible heat source is received in the recess.

  The tubular element is such that when the combustible heat source is ignited and received in the hollow, the tubular element sufficiently restricts the supply of air to the combustible heat source so that the combustible heat source is extinguished by the tubular element. Preferably they are arranged. The tubular element is preferably substantially impermeable to air. In this configuration, the gap between the outer surface of the heat source and the inner surface of the tubular element is preferably less than about 2 mm, and more preferably less than about 1 mm. This small gap limits the entry and exit of oxygen to the heat source as compared to free burning without the tubular element. Furthermore, the release of combustion gas from the heat source further restricts the flow of oxygen to the heat source. This is because the small gap between the tubular element and the heat source reduces the mixing rate of the combustion gas and ambient air.

  The tubular element is preferably configured to form a friction fit between the inner surface of the tubular element and the outer surface of the combustible heat source when the combustible heat source is received in the recess. Providing such a friction fit allows the tubular element to be retained on a combustible heat source without providing any additional connecting means.

  The inner surface of the tubular element can comprise a non-combustible material. The tubular element can be formed from a non-flammable material. The inner surface of the tubular element can be lined with a non-flammable material. Where the inner surface of the tubular element is lined with a non-combustible material, the non-combustible material may be coated with one or more inflatable varnishes, paints, lacquers, or any combination thereof on the inner surface of the tubular element. Can be applied as a coating formed by For example, by brushing, roller coating, dipping or spraying, or by the use of non-flammable sheets formed into the final shape of the tubular element by any well known manufacturing process such as cutting, rolling and gluing systems. The non-combustible material can be at least one of metal, metal oxide, ceramic, and stone. Further, the non-combustible material can be graphite.

  As used herein, the term “nonflammable” is used to describe a material that is substantially nonflammable at the temperature reached by a combustible heat source during combustion or upon ignition.

  The tubular element can comprise a thermochromic material or pigment. Thermochromic pigments or materials change color depending on temperature. This has the advantage of providing the user with a visual cue for the temperature near the heat source on the aerosol generating article. Furthermore, the use of thermochromic pigments or materials can provide a simple visual indication as to when the aerosol-generating article has reached a temperature low enough to be disposed of without additional precautions.

  The tubular element fits tightly against the flammable heat source and deforms in response to heat from the flammable heat source when received in the recess so as to limit the supply of air to the flammable heat source The tubular element can include a thermally responsive material arranged in such a manner.

  Such an arrangement may allow the tubular element to form a seal or partial seal around the combustible heat source. Thereby, the time taken for the heat source to extinguish can be further reduced. In addition, the thermally reactive material acts as an improved thermal barrier between the heat source and the outer surface of the aerosol generating article, reducing the temperature of the outer surface compared to embodiments where no thermally reactive material is present. sell.

  The thermally responsive material can include an expandable material.

  As used herein, the term “expandable material” is used to describe a material that expands due to an increase in temperature, as well as a coefficient, particularly as a result of thermal expansion.

  The expandable material can include any suitable material (s). In certain embodiments, the expandable material forms an insulative foam when exposed to heat from a combustible heat source of the aerosol generating article. In one embodiment, the expandable material comprises a carbon source (such as starch or one or more pentaerythritol (or other type of polyhydric alcohol)), an acid source (such as ammonium polysulfide), a swelling agent (melamine). And so on), and a binder (soy lecithin). In an alternative embodiment, the expandable material comprises a mixture of sodium silicate and graphite so that a hard carbide foam can be produced when the expandable material is exposed to heat from a combustible heat source of the aerosol generating article. Including.

  The inflatable material can be applied as a thermally responsive coating formed by applying one or more inflatable varnishes, paints, lacquers, or any combination thereof on the inner surface of the tubular element. For example, an inflatable paper or plastic-based sheet formed into the final shape of a tubular element by brushing, roller coating, dipping or spraying, or by any known manufacturing process such as cutting, rolling and gluing systems Depending on use. In one embodiment, the expandable material is a latex solution that is applied by spraying.

  The inflatable material may expand by any suitable amount when exposed to heat from the combustible heat source of the aerosol generating article. The expandable material preferably expands by a factor of about 10 to about 100 times its original dimensions when exposed to heat. When the expandable material is applied as a thermally responsive coating on the inner surface of the tubular element, the coating thickness is from about 10 microns to about 100 microns and has been exposed to heat from a combustible heat source of the aerosol-generating article. It is sometimes preferred to increase from about 1 mm to about 2 mm.

  The thermally responsive material can include a heat shrink material.

  As used herein, the term “heat shrink material” is used to describe a material that shrinks as a result of heat exposure.

  If the thermally responsive material includes a heat shrinkable material, the heat shrinkable material can be configured to deform the tubular element to prevent airflow to the combustible heat source.

  In certain embodiments, the heat shrink material is a mechanically expanded polymer layer that returns to its unexpanded dimensions as a result of heat exposure. For example, the heat shrink material can be made from a thermoplastic material such as nylon, polyolefin, fluoropolymer (such as FEP, PTFE or Kynar), PVC, neoprene, silicone elastomer, Viton, or any combination thereof. In certain embodiments, the heat shrink material is a fluororesin Kynar with a shrink temperature of about 135 ° C. and a shrink ratio of about 2: 1. In such embodiments, the fluororesin Kynar can be provided as a layer of material used to form the tubular element.

  In certain embodiments, the heat shrink material is applied as a thermally responsive coating on the inner surface of the tubular element. In such embodiments, the coating can be applied by any method. For example, the coating can be applied as a sheet or film affixed to the tubular element, for example by gluing or welding.

  The thermally responsive material can be provided along the entire length of the tubular element. The thermally responsive material can be provided along only the length of the tubular element. A thermally responsive material may be provided at the downstream end of the tubular element. With such an arrangement, the downstream end of the tubular element may form a seal or partial seal around the combustible heat source. As a result, a layer of air exists between the tubular element and the combustible heat source upstream of the thermally responsive material, which can form an insulating barrier.

  During the use of aerosol generating articles, flammable heat sources can reach high temperatures. For example, the heat source of the aerosol-generating article can reach an average temperature of approximately 500 ° C, and in certain cases, the temperature of the heat source can reach up to about 800 ° C. Accordingly, the tubular element may comprise a thermally insulating material arranged to reduce the temperature of the outer surface of the aerosol-generating article when a combustible heat source is received in the well during combustion or at elevated temperatures. The tubular element may comprise a barrier material that thermally isolates the combustible heat source when the combustible heat source is received in the recess during combustion or at elevated temperatures. Suitable insulating materials have a low thermal conductivity or substantially zero thermal conductivity. Suitable insulating materials can include, for example, cardboard, foam, polymer or ceramic materials, or other materials with low thermal conductivity.

  As used herein, the term “insulating material” refers to a bulk thermal conductivity of less than about 50 milliwatts / meter Kelvin (mW / (m · K)) at 23 ° C., and an improved unsteady planar heat source Used to describe a material having a relative humidity of 50% measured using the (MTPS) method.

  The tubular element may be formed from a suitable barrier material, such as a substantially non-flammable material or a substantially flame retardant material. The barrier material is preferably thermally stable in air at the highest temperature reached by the heat source of the aerosol-generating article. Suitable barrier materials can include, for example, metallic materials or ceramic materials.

  The tubular element can comprise one or more materials that undergo a phase change upon heating. The tubular element may comprise one or more materials that melt and flow over the heat source to extinguish the heat source and remove or limit the supply of oxygen to the heat source. The tubular element may comprise one or more materials that undergo an endothermic reaction or phase change and consume the thermal energy generated by the heat source, thereby cooling the heat source. The tubular element can comprise one or more materials that decompose when in contact with a heat source to produce a decomposition product that extinguishes the heat source. Examples of materials that can undergo a phase change when in proximity to a heat source include, for example, certain polymers and waxes.

  The tubular element is one selected from the group consisting of a barrier material, a non-combustible material, a flame retardant material, a heat conductive material, a heat insulating material, a foam material, a phase change material, a metal material, and a ceramic material The above materials can be provided. For example, the tubular element may comprise one or more materials selected from the group consisting of non-flammable materials, flame retardant materials, thermally conductive materials and thermal insulating materials.

  In some embodiments, the tubular element can advantageously comprise a heat reflective material that can regulate the heat radiated from the combustible heat source.

  As used herein, the term “heat reflective material” refers to a relatively high heat reflectivity and a relatively low heat radiation so as to reflect a greater percentage of incident radiation from its surface than the material emits. A material having a rate. The material preferably reflects more than 50% of the incident radiation, more preferably reflects more than 70% of the incident radiation, and most preferably reflects more than 75% of the incident radiation.

  The tubular element can be formed from a composite material, such as a material comprising multiple layers. The layer of composite material for the tubular element can be formed from two or more materials as described herein. For example, the tubular element may be formed from a material that includes an outer heat insulating layer, a second layer of intumescent or thermally responsive material, and an inner layer of non-flammable material.

  The tubular element can reduce undesirable odor emissions when a combustible heat source is received in the recess. Tubular elements can include materials that absorb or adsorb odors to reduce odor emission. Alternatively or additionally, the tubular element may comprise a heat-dissipating flavor compound. The flavor compound may be nanoparticles formed from a low melting wax encapsulating the flavor compound. The flavor compound is preferably volatile so that it is released into the atmosphere upon activation of the nanoparticles.

  The tubular element may be tapered. The tubular element may have a substantially cylindrical shape. The tubular element can have any suitable cross-sectional shape, such as circular, elliptical, or polygonal.

  The frail area is the area where the aerosol-generating article breaks easily to separate the first and second sections. The weak region can be formed by a weak region in one or more internal components of the aerosol-generating article. For example, the weak region can be formed by a local decrease in the thickness of one or more internal components of the aerosol generating article. The frail area can be formed by a connection of two or more internal components of the aerosol generating article.

  The frail area may be a frail area. In a preferred embodiment, the frail area is a frail line along which the first and second sections are separable.

  The aerosol generating article preferably includes a wrapper surrounding at least a portion of the first section and at least a portion of the second section. The wrapper allows the first and second sections to be joined together during manufacture. The frail area may comprise the frail formation provided by the wrapper.

  The frail formation can include a local decrease in the thickness of the wrapper. For example, the weak formation may include one or more ablation areas or lines, one or more score lines, or a combination thereof. The weakness formation may include sections of different wrapper materials that are weaker. The frail formation may include a plurality of perforations in the wrapper. The plurality of perforations may extend around at least a portion of the aerosol generating article. The plurality of perforations can surround the aerosol generating article.

  The wrapper can be affixed to the first section and the second section away from the frail area. By sticking the wrapper away from the weak area, the wrapper can more easily break in the weak area when the user wants to separate the first and second sections. The wrapper is preferably affixed to the first and second sections using glue. The glue may be provided in a line that extends from or adjacent to the distal end of the aerosol generating article toward the mouth end of the aerosol generating article. The glue line can be interrupted adjacent to or at the frail line.

  The wrapper may be cigarette paper. The cigarette paper can be any suitable material for packaging the components of the aerosol generating article in the form of a rod. The cigarette paper may enclose the components of the aerosol generating article so that the paper grips the components of the aerosol generating article when the articles are assembled and held in position within the rod. Suitable materials are well known in the art.

  The frail area, and thus where the aerosol generating article can be separated into individual first and second sections, can be provided at any suitable distance along the aerosol generating article. The frail area is preferably located at least 10 mm from either end of the aerosol-generating article. More preferably, the frail area is located at least 20 mm from either end of the aerosol-generating article. This arrangement allows the user to separate the first and second sections and place the tubular element on the heat source, holding either the first or second section in a particularly close position to the combustible heat source This reduces the risk that the user will be exposed to high surface temperatures near the heat source or will be exposed to dirt from the flammable heat source.

  In certain embodiments, the frailty region is located between about 10% and about 90% along the length of the aerosol generating article, where 0% means the upstream end and 100% is upstream of the aerosol generating article. It means the end or the end of the mouth side. The frailty region is about 20% to about 80% along the length of the aerosol generating article, about 30% to about 70% along the length of the aerosol generating article, or about 40 along the length of the aerosol generating article. % To about 60%. In one particular embodiment, the frailty region is located about 50% along the length of the aerosol generating article.

  An aerosol generating article according to the present invention comprises a first section having a combustible heat source and an aerosol forming substrate. The aerosol generating article may comprise a plurality of elements assembled in the form of a rod.

  As used herein, the term “aerosol-generating article” is used to mean an article that includes an aerosol-forming substrate that has the ability to release volatile compounds capable of forming an aerosol. The aerosol-generating article may be a non-flammable aerosol-generating article that is an article that releases volatile compounds without combustion of the aerosol-forming substrate. The aerosol-generating article can be a heated aerosol-generating article that is an aerosol-generating article that includes an aerosol-forming substrate that is intended to be heated rather than combusted to release volatile compounds that can form an aerosol. The heated aerosol generating article may comprise an on-board heating means that forms part of the aerosol generating article or is configured to interact with an external heater that forms part of a separate aerosol generating device. Also good.

  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. The aerosol generating article may be similar to a conventional smoking article such as a cigarette. The aerosol-generating article can include tobacco. The aerosol generating article may be disposable. The aerosol-generating article can be partially reusable and can comprise a refillable or replaceable aerosol-forming substrate.

  The combustible heat source is preferably a solid heat source and includes, but is not limited to, carbon and carbon-based materials including aluminum, magnesium, one or more carbides, one or more nitrides, and combinations thereof. Any suitable combustible fuel may be provided. Solid flammable heat sources for heated smoking articles and methods for making such heat sources are well known in the art, for example, US-A-5,040,552 and US-A-5,595. , 577. Typically, well-known solid combustible heat sources for heated smoking articles are carbon-based, ie, comprise carbon as the primary combustible material.

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

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

  As used herein, the term “blind” describes a heat source that does not have any airflow channels extending from the front end surface to the rear end surface of the combustible heat source. As used herein, the term “blind” is also used to describe a flammable heat source that includes one or more airflow channels that extend from the front end face of the flammable heat source to the rear end face of the flammable heat source. In some cases, a flammable, substantially air-impermeable barrier between the rear end face of the flammable heat source and the aerosol-forming substrate barrier causes air to be drawn through one or more airflow channels along the length of the flammable heat source. To prevent it.

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

  An aerosol generating article according to the present invention comprising a blind flammable heat source comprises one or more air downstream of the rear end face of the flammable heat source for drawing air through the aerosol generating article and into one or more air flow paths. Provide a suction port. An aerosol generating article according to the present invention comprising a non-blind flammable heat source comprises one or more air downstream of the rear end face of the flammable heat source for drawing air through the aerosol generating article and into one or more air flow paths. A suction port may also be provided.

  In some embodiments, an aerosol generating article according to the present invention comprising 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 air flow paths of an aerosol generating article according to the present invention that includes a blind flammable heat source does not pass through any air flow channels along the blind flammable heat source. The lack of any airflow channel through the blind combustible heat source advantageously advantageously prevents or suppresses the activation of the combustion of the blind combustible 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 preventing or suppressing the activation of combustion of the blind flammable heat source, and thus preventing or suppressing excessive temperature rise in the aerosol-forming substrate, the combustion or Pyrolysis can be advantageously avoided. In addition, the impact of the user's tobacco situation on the mainstream aerosol composition can be advantageously minimized or reduced.

  Also, the inclusion of the blind flammable heat source allows the combustion and decomposition products and other materials formed during ignition and combustion of the blind flammable heat source to be drawn through the aerosol generating article according to the present invention during its use. Advantageously, it can be substantially prevented or inhibited from entering the air. This is particularly beneficial when the blind flammable heat source includes one or more additives to assist ignition or combustion of the blind flammable heat source.

  In an aerosol generating article according to the present invention comprising a blind flammable heat source, heat transfer from the blind flammable heat source to the aerosol-forming substrate occurs primarily by conduction. Heating of the aerosol-forming substrate by forced convection is minimized or reduced. This can advantageously help to minimize or reduce the impact of the user's tobacco situation on the mainstream aerosol composition of the article according to the invention.

  In aerosol-generating articles according to the present invention that include blind flammable heat sources, it is particularly important to optimize the conductive heat transfer between the flammable heat source and the aerosol-forming substrate. As will be described further below, if there is little if any heating of the aerosol-forming substrate by forced convection, in an aerosol-generating article comprising a blind heat source according to the present invention, at least the rear portion of the combustible carbonaceous heat source and It is particularly preferred to include one or more thermally conductive elements around at least the front portion of the aerosol-forming substrate.

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

  The diameter of the at least one longitudinal airflow channel may be from about 1.5 mm to about 3 mm, more preferably from about 2 mm to about 2.5 mm. As described in more detail in WO-A-2009 / 022232, the inner surface of at least one longitudinal airflow channel may be partially coated or fully coated.

  In an embodiment of an aerosol generating article that is a conventional cigarette with an ignition end, the heat source would be a large amount of tobacco.

  As used herein, the term “aerosol-forming substrate” is used to describe a substrate capable of releasing a volatile compound capable of forming an aerosol 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, fines of gaseous substances are usually liquid or solid at room temperature). ), And liquid droplets of gas and condensed vapor.

  The aerosol-forming substrate may be a solid aerosol-forming substrate. Alternatively, the aerosol-forming substrate may comprise both a solid component and a liquid component. The aerosol-forming substrate may include a tobacco-containing material that includes a volatile tobacco flavor compound that is released from the substrate upon heating. Alternatively, the aerosol-forming substrate may comprise a non-tobacco material. The aerosol-forming substrate may further comprise one or more aerosol formers. Examples of suitable aerosol formers include, but are not limited to glycerin and propylene glycol.

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

  If the aerosol-forming substrate is a solid aerosol-forming substrate, the solid aerosol-forming substrate is a herbic leaf, tobacco leaf, tobacco stem fragment, reconstituted tobacco, homogenized tobacco, extruded tobacco, and expanded tobacco. It may contain one or more, for example one or more of powders, granules, pellets, pieces, spaghetti strands, strips or sheets. The solid aerosol forming substrate may be in a form that is not contained in a container, or a suitable container or cartridge may be provided. For example, the aerosol-forming material of the solid aerosol-forming substrate can be contained in 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 an aerosol-forming substrate.

  Optionally, the solid aerosol forming substrate can include additional tobacco or non-tobacco volatile flavor compounds that are released upon heating of the solid aerosol forming substrate. The solid aerosol forming substrate can also include capsules containing, for example, additional tobacco or non-tobacco volatile flavor compounds, such capsules can melt during heating of the solid aerosol forming substrate.

  Optionally, the solid aerosol forming substrate may be provided on or embedded in a thermally stable carrier. The carrier may take the form of powder, granules, pellets, pieces, spaghetti strands, strips or sheets. The solid aerosol-forming substrate may be deposited on the surface of the carrier, for example in the form of a sheet, foam, gel or slurry. The solid aerosol-forming substrate may be deposited on the entire surface of the carrier, or alternatively in a pattern to provide non-uniform flavor delivery during use.

  The aerosol-forming substrate may be in the form of a plug or segment that includes a material that can emit volatile compounds in response to heat surrounded by paper or other wrapper. If 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 from 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 comprise 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 combustible heat source and the 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 directly contacts a portion of a component, or a portion of a component. .

  The aerosol generating article according to the present invention may comprise a thermally conductive element that is around and in direct contact with at least the rear portion of the combustible heat source and at least the front portion of the aerosol-forming substrate. In such embodiments, the thermally conductive element provides a thermal link between the flammable heat source of the aerosol-generating article according to the present invention and the aerosol-forming substrate, and is advantageously flammable to provide an acceptable aerosol. It helps to facilitate proper heat transfer from the heat source to the aerosol-forming substrate.

  Alternatively or additionally, the aerosol generating article according to the present invention comprises a flammable heat source and a flammable heat source such 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. A thermally conductive element may be provided through a gap from one or both of the aerosol-forming substrates.

  If the aerosol generating article includes a thermally conductive element around at least the rear portion of the combustible heat source and at least the front portion of the aerosol-forming substrate, the thermally conductive element can be formed of 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 one or more thermally conductive elements are preferably non-flammable. In certain embodiments, the one or more thermally conductive elements may be oxygen limited. In other words, the one or more thermally conductive elements can inhibit or resist the passage of oxygen through the thermally conductive elements.

  Suitable heat conducting elements include, but are not limited to, metal foil wrappers (eg, aluminum foil wrappers, steel wrappers, iron foil wrappers, copper foil wrappers, etc.), and metal alloy foil wrappers.

  The aerosol generating article according to the present invention may further comprise a moving element or a spacer element downstream of the aerosol forming substrate. Such an element may take the form of a hollow tube 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 spaced from one or both of the aerosol-forming substrate and the mouthpiece.

  Encapsulation of the moving element advantageously allows for cooling of the aerosol generated by heat transfer from the combustible heat source to the aerosol-forming substrate. Inclusion of the moving element also advantageously adjusts the overall length of the aerosol-generating article to a desired value, for example similar to the length of a conventional cigarette, by appropriate selection of the length of the moving element. to enable.

  The length of the moving element may be about 7 mm to about 50 mm, such as about 10 mm to about 45 mm, or about 15 mm to about 30 mm. The length of the moving element may be other lengths 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 term “moving element” means an element comprising at least one open tubular hollow body. When the aerosol generating article is in its assembled state, i.e., when the first and second sections are joined together in the weak region, the moving element is a hollow that defines a portion of the air flow path through the article. Provide the body. When the aerosol generating article comprises a moving element, in use, the air drawn into the aerosol generating article passes downstream from the aerosol-forming substrate through the aerosol generating article to the distal end of the aerosol generating article. Sometimes it passes through an open tubular hollow body at at least one end of the moving element.

  The transfer element is formed from at least one suitable material that is substantially thermally stable at the temperature of the aerosol generated by the transfer of heat from the combustible carbonaceous heat source to the aerosol-forming substrate. It may include an open-ended tubular hollow body. Suitable materials are well known in the art and include, but are not limited to, paper, cardboard, plastic, such cellulose acetate, ceramic, and combinations thereof.

  In an embodiment of the aerosol generating article wherein the first section comprising the heat source and the aerosol-forming substrate is upstream of the second section, the first and second sections are integrally connected in the weak region and the tubular element is at both ends. The moving element can comprise a tubular element. The moving element can be formed by a tubular element.

  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.

  The aerosol cooling element may comprise an assembly of material sheets selected from the group consisting of metal foil, polymeric material and substantially non-porous paper or cardboard. In certain embodiments, the aerosol cooling element comprises polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA) and aluminum foil. An assembly of material sheets selected from the group may be included.

  In certain preferred embodiments, the aerosol cooling element is a collection of sheets of biodegradable polymeric material such as polylactic acid (PLA) or Mater-Bi® grade (a commercial family of starch-based copolyesters). May include 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 form part of the first section or the second section. The mouthpiece is provided as a separate component or as part of a third section that is integrally connected to the first or second section, either directly or via one or more intermediate components. sell.

  The mouthpiece may include a filter. For example, the mouthpiece may include a filter plug having one or more segments. Where the mouthpiece includes a filter plug, the filter plug is preferably a single segment filter plug. The filter plug may comprise one or more segments comprising cellulose acetate, paper, or other suitable well-known filtering material, or combinations thereof. The filter plug preferably includes a filtering material with low filtering efficiency.

  The aerosol generating article may be substantially cylindrical in shape. The aerosol generating article may be substantially elongated. The aerosol-generating article has a length and a circumference that is substantially orthogonal to the length.

  The aerosol-forming substrate can be substantially cylindrical in shape. The aerosol-forming substrate may be substantially elongated. The aerosol-forming substrate also has a length and a circumference that is substantially orthogonal to the length. 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 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 approximately 65 mm to approximately 100 mm.

  The aerosol generating article can have any desired outer diameter. For example, the outer diameter of the aerosol-generating article can be approximately 5 mm to approximately 12 mm.

  The aerosol generating article may be surrounded by an outer wrapper of a cigarette paper having, for example, low air permeability. Alternatively or additionally, the mouthpiece may be surrounded by tipping paper.

  Of course, specific combinations of the various features described and defined in any aspect of the invention may be independently implemented and / or supplied and / or used.

  The invention will be further described, by way of example only, with reference to the accompanying drawings.

FIG. 1 shows a schematic longitudinal section of a first embodiment of a smoking article according to the invention. FIG. 2 shows a schematic longitudinal cross-sectional view of the smoking article of FIG. 1, wherein the smoking article is in a fire extinguishing configuration. FIG. 3 shows a schematic longitudinal section of a second embodiment of a smoking article according to the invention. FIG. 4 shows a schematic longitudinal cross-sectional view of the smoking article of FIG. 3, wherein the smoking article is in a fire extinguishing configuration. FIG. 5 shows a schematic longitudinal cross-sectional view of a third embodiment of a smoking article, which is included only for background concerns. 6 shows a schematic longitudinal cross-sectional view of the smoking article of FIG. 5 with the removable cap removed.

  A smoking article 100 according to the first embodiment of the present invention shown in FIG. 1 comprises a blind combustible carbonaceous heat source 102, an aerosol-forming substrate 104, an airflow directing element 106, an aerosol cooling element 108, and a coaxially disposed and in contact with each other. A mouthpiece 110 is provided. The combustible carbonaceous heat source 102, aerosol forming substrate 104 and airflow directing element 106 are wrapped with a first outer wrapper 112 of low air permeability cigarette paper to form a first section 114 of the smoking article 100. . Aerosol cooling element 108 and mouthpiece 110 are wrapped with a second outer wrapper 116 of low air permeability cigarette paper to form a second section 118 of smoking article 100. Thus, the first section 114 is upstream of the second section 118. The smoking article 100 further includes a strip of tipping paper 120 that surrounds at least a downstream portion of the first section 114 and at least an upstream portion of the second section 118. The first section 114 and the second section 118 are integrally connected by a tipping paper 120 along a first weak line 122 that includes a plurality of perforations surrounding the smoking article 100. The first weak line 122 defines a weak formation in the chipping paper 120.

  A removable cap 124 is provided at the distal end of the smoking article 100 and is directly adjacent to the heat source 102. The removable cap 124 includes a central portion 126 and is enclosed within a portion 128 of the first outer wrapper 112. In the illustrated embodiment, the central portion 126 includes a desiccant such as glycerin provided to preferentially absorb moisture compared to a heat source. A portion 128 of the first outer wrapper is coupled to the remaining portion of the first outer wrapper 112 along the second weakness line 130. The frail line 130 includes a plurality of perforations in the first outer wrapper 112 surrounding the smoking article 100.

  The aerosol-forming substrate 104 includes a cylindrical plug 132 of homogenized tobacco material (including glycerin as an aerosol former) located immediately downstream of the combustible carbonaceous heat source 102 and surrounded by a plug wrap 134.

  A non-flammable, substantially air-impermeable barrier 136 may be provided between the downstream end of the combustible heat source 102 and the upstream end of the aerosol-forming substrate 104. As shown in FIG. 1, the non-flammable, substantially non-breathable barrier comprises a non-flammable, substantially non-breathable barrier coating 136 that is provided over the entire rear surface of the flammable carbonaceous heat source 102.

  A heat conducting element (not shown) consisting of a tubular layer of aluminum foil surrounds and is in direct contact with the rear portion of the combustible carbonaceous heat source 102 and the adjacent front portion of the aerosol-forming substrate 104.

  The airflow directing element 106 is located downstream of the aerosol-forming substrate 104 and includes an open-ended, substantially air-impermeable, eg, cardboard hollow tube 138, whose diameter is compared to the aerosol-forming substrate 104. small. The upstream end of the open-ended hollow tube 138 is adjacent to the aerosol-forming substrate 104. The open end hollow tube 138 is surrounded by an annular breathable diffuser 140 made of, for example, cellulose acetate tow, of substantially the same diameter as the aerosol-forming substrate 104.

  The open-ended hollow tube 138 and the annular breathable diffuser 140 are separate components that are bonded or otherwise joined together to form the airflow directing element 106 prior to assembly of the smoking article 100. sell. In still further embodiments, the open-ended hollow tube 138 and the annular breathable diffuser 140 can be part of a single component. For example, an open-ended hollow tube and an annular breathable diffuser can be part of a single hollow tube of breathable material having a substantially impermeable coating applied to its inner surface.

  In a particularly preferred embodiment, the central portion 116 of the removable cap 114 is made of the same material as the airflow directing element, so that it is an open, substantially air-permeable hollow surrounded by an annular air-permeable diffuser. Including tubes.

  As shown in FIG. 1, the circumferential arrangement of the air inlets 142 is provided in a first outer wrapper 112 that surrounds a first section 114 in the region of the airflow directing element 106.

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

  The mouthpiece 110 of the smoking article 100 is located immediately downstream of the aerosol cooling element 108, includes a filter segment 144, and suitable filtering material (such as ultra-low filtration efficiency cellulose acetate tow surrounded by a filter plug wrap 148). A cylindrical plug 146 and a tubular element 150 immediately downstream of the filter segment 144. Tubular element 150 includes a cylindrical tube of a suitable material that is substantially rigid, such as, for example, cardboard, paperboard, or heat resistant rigid plastic. The tubular element 150 defines a recess 152 at the mouth end of the smoking article 100. Accordingly, the mouthpiece 110 has a mouth end indentation formed by the indentation 152.

  To use the smoking article 100, the user removes the removable cap by pressing the removable cap 124 between the thumb and another finger and pressing in the transverse direction. By squeezing the cap 124, sufficient force is applied to the second frail line 130 to locally break the first outer wrapper 112. Next, the user removes the cap 124 by twisting the cap and breaking the remaining portion of the second frail line 130. When the cap 124 is removed, the heat source 102 is partially exposed, which allows the user to ignite the smoking article 100.

  In use, the user ignites a combustible heat source 102 that heats the aerosol-forming substrate 104 to generate an aerosol. As the user inhales mouthpiece 110, air is drawn through inlet 142 and passes through aerosol-forming substrate 104, airflow directing element 106, aerosol cooling element 108, and mouthpiece 110 as indicated by the arrows in FIG. 1. Enter the user's mouth.

  After use of the smoking article 100, the user tears the tipping paper 120 along the first weak line 122 and separates the first section 114 and the second section 118 across the separation surface 1000 to remove the smoking article. Divide into two. Next, the user places the downstream end of the second section 118 above the upstream end of the first section 114 so that the combustible heat source 102 is received in the recess 152 of the tubular element 150, as shown in FIG. Put.

  In the fire extinguishing configuration shown in FIG. 2, the tubular element 150 is held on the combustible heat source 102 and is frictioned against the combustible heat source 102 such that the first and second sections 114, 188 are held together. Form a fit. Tubular element 150, which can be made from any suitable material, such as a flame retardant material, sufficiently limits the supply of oxygen to the flammable heat source so that the heat source is extinguished and thus cools. In this way, the user is provided with a simple and self-contained means of extinguishing the flammable heat source after use of the smoking article.

  Furthermore, the tubular element can be provided with a fragrance that can be generated when the tubular element is heated by a combustible heat source. The fragrance can be released to the atmosphere, but can act to mask the unpleasant odor emitted by the heat source when extinguished. The fragrance can provide a clean air effect by giving off a pleasant smell and fragrance. The fragrance is preferably sufficiently volatile to evaporate quickly after the tubular element is placed on the flammable heat source.

  In a preferred embodiment, the fragrance is amylcinnamal, amylcinnamyl alcohol, benzyl alcohol, benzyl salicylate, cinnamyl alcohol, cinnamal, citral, coumarin, eugenol, geraniol, hydroxycitronellal, hydroxymethylpentylcyclohexenecarboxaldehyde, isoeugenol, Anisyl alcohol, benzyl benzoate, benil cinnamate, citronellol, farnesol, hexylcinnamaldehyde 2-methyl-3- (4-tert-butylbenzyl) propionaldehyde, d-limonene, linalool, heptin methyl carbonate, and 3- Selected from the list consisting of methyl-4- (2,6,6-trimethyl-2-cyclohexen-1-yl) -buten-2-one It may include one or more aromatic components.

  3 and 4 show a second embodiment of the smoking article 300. The smoking article 300 is similar in structure to the first embodiment of the smoking article 100 shown in FIGS. 1 and 2, and similar reference numerals are used when the same features are present. However, as shown in FIG. 3, the tubular element 350 of the smoking article 300 of the second embodiment is located immediately upstream of the aerosol cooling element 308 and of the second section 318 rather than the downstream end of the second section. At the upstream end. The recess 352 defined by the tubular element 350 forms a moving or spacer element between the airflow directing element 306 and the aerosol cooling element 308. Instead of having an indentation at the mouth end formed by the tubular element, the mouthpiece 310 and the mouth end of the smoking article 300 are formed by a filter segment 344 as in the first embodiment of the smoking article shown in FIG. Is done.

  To use the smoking article 300, the user removes the removable cap 324 in the same manner as described with reference to FIGS. 1 and 2 to partially expose the combustible heat source 302, thereby The user can ignite the smoking article 300.

  In use, the user ignites a combustible heat source 302 that heats the aerosol-forming substrate 304 to generate an aerosol. As the user inhales mouthpiece 310, air is drawn through inlet 342 and, as indicated by the arrows in FIG. 3, aerosol-forming substrate 304, airflow directing element 306, tubular element 346, aerosol cooling element 308, and mouse Pass through piece 310 and enter the user's mouth.

  After use of the smoking article 300, the user tears the smoking article by tearing the tipping paper 320 along the first weak line 322 and separating the first section 314 and the second section 318 across the separation surface 3000. Divide into two. The user then moves the upstream end of the second section 318 over the upstream end of the first section 314 so that the combustible heat source 302 is received in the recess 352 of the tubular element 350, as shown in FIG. Put.

  In the fire extinguishing configuration shown in FIG. 4, similar to the smoking article 100 of the first embodiment, the tubular element 350 is held on the combustible heat source 302 and oxygen to the combustible heat source so that the heat source is extinguished and thus cools. A friction fit is formed against the combustible heat source 302 so as to sufficiently limit the supply of heat. In this embodiment, the length of the recess 352 defined by the tubular element 350 is preferably greater than the length of the exposed portion of the heat source 302 received in the recess 352. This prevents direct contact between the combustible heat source 302 and the aerosol cooling element 308, reducing the risk of the aerosol cooling element 308 being exposed to excessive heat from the heat source during fire fighting, otherwise The result is an unpleasant odor emission due to melting of the aerosol cooling element 308.

  Alternatively or additionally, the tubular element 350 may comprise an insulating material that reduces heat transfer from the heat source 302 to the aerosol cooling element 308 during fire extinguishing.

  FIGS. 5 and 6 show a third embodiment of a smoking article 500, which is included only for background concerns. The smoking article 500 is similar to the first and second embodiments of the smoking article 100, 300 shown in FIGS. 1-4, and similar reference numerals are used when the same features are present. However, in the smoking article 500 of the third embodiment, the first section 514 is downstream of the second section 518 and is positioned adjacent to the coaxial flammable carbonaceous heat source 502, aerosol. A forming substrate 504, an airflow directing element 506, an aerosol cooling element 508, a moving element 509 and a mouthpiece 510 are provided. Similar to the smoking article 300 of the second embodiment, the mouthpiece 510 and the mouth end of the smoking article 500 are formed by filter segments 544.

  The combustible carbonaceous heat source 502, the aerosol-forming substrate 504 and the airflow directing element 506 are wrapped with a first outer wrapper 512 of low air permeability cigarette paper to form the first portion of the first section 514. To do. Aerosol cooling element 508, moving element 509 and mouthpiece 510 are wrapped with a second outer wrapper 516 of low air permeability cigarette paper to form the second portion of first section 514. The first section 514 surrounds at least a downstream portion of the first outer wrapper 512 and at least an upstream portion of the second outer wrapper 516, and a band of chipping paper 520 that holds the two portions of the first section 514 together. Further included.

  Similar to the smoking articles 100, 300 of the first and second embodiments, the smoking article 500 also includes a removable cap 524 at the distal end of the smoking article 500 and is directly adjacent to the heat source 502. The removable cap 124 includes a central portion 526 and is enclosed within a portion 528 of the first outer wrapper 512. A portion 528 of the first outer wrapper surrounding the cap 524 is coupled to the remaining portion of the first outer wrapper 512 along the second weakness line 522. The frail line 522 includes a plurality of perforations in the first outer wrapper 512 that surrounds the smoking article 500. The frail line 522 defines a frail formation within the first outer wrapper 512.

  Unlike the smoking articles 100, 300 of the first and second embodiments, in this embodiment, the tubular element 550 is provided as part of the cap 524 and forms the second section 514 of the smoking article 500. Tubular element 550 surrounds central portion 526 of cap 524 and at least a portion of the length of heat source 502. As such, the heat source 502 is received within a recess 552 defined by the tubular element 550 prior to use of the smoking article. A portion 528 of the first outer wrapper 512 surrounding the cap also surrounds the tubular element 550 and integrally connects the first section 514 and the second section 518.

  To use the smoking article 500, the user twists the cap 524 and the tubular element 550 to break the first outer wrapper 512 along the weak line 522 and the first portion 528 of the wrapper to the first outer side. Separating the first and second sections 514, 518 across the separation surface 5000 by separating from the rest of the wrapper 512. When the first and second sections 514, 518 are separated, the heat source 502 is partially exposed as shown in FIG. 6, allowing the user to ignite the smoking article 500.

  In use, the user ignites a combustible heat source 502 that heats the aerosol-forming substrate 504 to generate an aerosol. As the user inhales the mouthpiece 510, air is drawn through the inlet 542, and as shown by the arrows in FIG. Go through 510 and enter the user's mouth.

  After use of the smoking article 500, the user returns the second section 518 to its original position at the upstream end of the first section 514 so that the combustible heat source 502 is received in the recess 552 of the tubular element 550. In this position, the tubular element 550 forms a friction fit with the combustible heat source 502 and sufficiently restricts the supply of oxygen to the combustible heat source so that the heat source is extinguished and thus cooled.

  In all the embodiments described above, the tubular element comprises an intumescent material or a heat shrinkable material that further limits the supply of oxygen to the heat source in response to the heat of the combustible heat source when the smoking article is in a fire extinguishing configuration. sell. The expandable material or heat shrink material may also at least partially close the open end of the tubular element to further limit the supply of oxygen to the heat source. In addition to further limiting the supply of oxygen, the at least partially closed end of the tubular element can provide a physical barrier between the heat source and any external material.

  The specific embodiments and examples described above illustrate the invention but do not limit the invention. Of course, other embodiments of the invention may be made and the specific embodiments and examples described herein are not exhaustive.

Claims (12)

An aerosol generating article,
A first section having a combustible heat source and an aerosol-forming substrate;
A second section comprising a tubular element defining a recess at one end of said second section;
The first and second sections are integrally connected in a weak region, the first and second sections are separable in the weak region, and the combustible heat source is at least partially in the recess. So that the tubular element can be placed on the combustible heat source,
The first section is upstream of the second section when the first and second sections are joined together in the frail area;
The tubular element is at least partially open at both ends thereof so that air can be drawn through the tubular element along the aerosol generating article during use of the aerosol generating article;
The tubular element is at the downstream end of the second section such that when the first and second sections are connected together, the recess forms a recess at the mouth end of the aerosol generating article. Or when the tubular element is at the upstream end of the second section and the first and second sections are joined together to form a moving element of the aerosol generating article An aerosol-generating article that is either   The aerosol generating article of claim 1, wherein the tubular element is arranged such that when the combustible heat source is received in the recess, the tubular element extends substantially along the entire length of the combustible heat source.   When the combustible heat source is ignited and received in the recess, the tubular element sufficiently restricts the supply of air to the combustible heat source and the combustible heat source is extinguished by the tubular element. The aerosol generating article according to claim 1, wherein the tubular elements are arranged as described above.   The tubular element is dimensioned to form a friction fit between the inner surface of the tubular element and the outer surface of the combustible heat source when the combustible heat source is received in the recess. Item 4. The aerosol-generating article according to Item 3.   The inner surface of the tubular element includes an incombustible material, and the incombustible material is preferably at least one of a metal, a metal oxide, a ceramic, and a stone. The aerosol-generating article according to claim 1.   Heat from the combustible heat source when the combustible heat source is received in the recess so that the tubular element fits tightly to the combustible heat source and restricts the supply of air to the combustible heat source. The aerosol-generating article according to any one of claims 1 to 5, wherein the tubular element includes a thermally responsive material arranged to deform in response to.   The aerosol-generating article according to claim 6, wherein the thermally responsive material comprises an expandable material.   The aerosol-generating article according to claim 6, wherein the thermally responsive material comprises a heat shrinkable material.   The aerosol generating article according to any one of claims 1 to 8, wherein the frail area is a frail line.   10. The aerosol generating article according to any one of claims 1 to 9, wherein the first and second sections are surrounded by a wrapper, and the frail area comprises a frail former provided in the wrapper.   The aerosol generating article according to claim 10, wherein the weakness forming body includes a plurality of perforations in the wrapper, the plurality of perforations surrounding the aerosol generating article.   12. The aerosol generating article according to any one of the preceding claims, wherein the frail area is located at least about 10 mm, preferably at least about 20 mm from either end of the aerosol generating article.

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